Page 1 Catalyst 3550 Multilayer Switch Command Reference Cisco IOS Release 12.2(44)SE February 2008 Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 527-0883 Text Part Number: OL-8566-02...
Page 2 OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY. The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB’s public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California.
Page 3: Table Of Contents
Global Configuration Mode Interface Configuration Mode config-vlan Mode VLAN Configuration Mode Line Configuration Mode Catalyst 3550 Switch Cisco IOS Commands C H A P T E R aaa accounting dot1x aaa authentication dot1x aaa authorization network access-list hardware program nonblocking...
Page 4 2-60 cluster holdtime 2-61 cluster member 2-62 cluster outside-interface 2-64 cluster run 2-65 cluster standby-group 2-66 cluster timer 2-68 define interface-range 2-69 delete 2-71 deny 2-72 deny (ARP access-list configuration) 2-75 Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 5 2-121 interface range 2-123 interface vlan 2-125 ip access-group 2-127 ip address 2-129 ip admission 2-131 ip admission name proxy http 2-133 ip arp inspection filter vlan 2-135 ip arp inspection limit 2-137 Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 6 2-188 ip igmp snooping vlan static 2-190 ip source binding 2-192 ip ssh 2-194 ip verify source 2-196 ip vrf (global configuration) 2-197 ip vrf (interface configuration) 2-200 Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 7 2-251 mls qos min-reserve 2-255 mls qos monitor 2-256 mls qos trust 2-258 monitor session 2-261 mvr (global configuration) 2-265 mvr (interface configuration) 2-268 pagp learn-method 2-271 pagp port-priority 2-273 permit 2-275 Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 8 2-331 show controllers switch 2-336 show controllers tcam 2-337 show controllers utilization 2-339 show dot1q-tunnel 2-341 show dot1x 2-342 show env 2-346 show errdisable detect 2-347 show errdisable flap-values 2-349 Catalyst 3550 Multilayer Switch Command Reference viii OL-8566-02...
Page 9 2-416 show mac address-table 2-418 show mac address-table address 2-420 show mac address-table aging-time 2-422 show mac address-table count 2-424 show mac address-table dynamic 2-426 show mac address-table interface 2-428 Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 10 2-483 show tcam qos 2-485 show udld 2-487 show version 2-490 show vlan 2-492 show vlan access-map 2-496 show vlan filter 2-497 show vmps 2-498 show vtp 2-500 shutdown 2-504 shutdown vlan 2-505 Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 11 2-549 spanning-tree port-priority 2-551 spanning-tree portfast (global configuration) 2-553 spanning-tree portfast (interface configuration) 2-555 spanning-tree stack-port 2-557 spanning-tree transmit hold-count 2-559 spanning-tree uplinkfast 2-560 spanning-tree vlan 2-562 speed 2-565 storm-control 2-567 switchcore 2-570 Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 12 2-633 vlan dot1q tag native 2-637 vlan filter 2-639 vmps reconfirm (privileged EXEC) 2-641 vmps reconfirm (global configuration) 2-642 vmps retry 2-643 vmps server 2-644 vtp (global configuration) 2-646 vtp (privileged EXEC) 2-650 Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 13 2-658 wrr-queue dscp-map 2-660 wrr-queue min-reserve 2-662 wrr-queue queue-limit 2-663 wrr-queue random-detect max-threshold 2-665 wrr-queue threshold 2-667 Catalyst 3550 Switch Boot Loader Commands A P P E N D I X boot copy delete flash_init format fsck A-10 help A-11...
Page 14 B-36 debug spanning-tree backbonefast B-38 debug spanning-tree bpdu B-39 debug spanning-tree bpdu-opt B-40 debug spanning-tree mstp B-41 debug spanning-tree switch B-43 debug spanning-tree uplinkfast B-45 debug sw-vlan B-46 debug sw-vlan ifs B-48 Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 15 Contents debug sw-vlan notification B-49 debug sw-vlan vtp B-51 debug udld B-53 N D E X Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 16 Contents Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 17 IP services image pre-installed. Catalyst 3550 Fast Ethernet switches are shipped with either the IP base image or the IP services image pre-installed. After initial deployment, you can order the upgrade kit to upgrade Catalyst 3550 Fast Ethernet switches from the IP base image to the IP services image.
Page 18: Related Publications
Means the following will help you solve a problem. The tips information might not be troubleshooting Timesaver or even an action, but could be useful information. Related Publications These documents provide complete information about the switch and are available from this Cisco.com site: http://www.cisco.com/en/US/products/hw/switches/ps646/tsd_products_support_series_home.html Release Notes for the Catalyst 3550 Multilayer Switch •...
Page 19: Obtaining Documentation And Submitting A Service Request
Obtaining Documentation and Submitting a Service Request For information on obtaining documentation, submitting a service request, and gathering additional information, see the monthly What’s New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation, at: http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html...
Page 20 Preface Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 21: Type Of Memory
C H A P T E R Using the Command-Line Interface The Catalyst 3550 multilayer switches are supported by Cisco IOS software. This chapter describes how to use the switch command-line interface (CLI) to configure software features. For a complete description of the commands that support these features, see Chapter 2, “Catalyst 3550...
Page 22: C H A P T E R 1 Using The Command-Line Interface
From global configuration mode, To exit to global configuration mode, Switch(config-line)# specify a line by entering the line enter the exit command. command. To return to privileged EXEC mode, enter the end command, or press Ctrl-Z. Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 23: User Exec Mode
You can specify either the terminal or NVRAM as the source of configuration commands. This example shows you how to access global configuration mode: Switch# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 24: Interface Configuration Mode
VLAN Configuration Mode You can use the VLAN configuration commands to create or modify VLAN parameters for VLAN IDs 1 to 1005. Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 25: Line Configuration Mode
To exit line configuration mode and to return to global configuration mode, use the exit command. To exit line configuration mode and to return to privileged EXEC mode, enter the end command, or press Ctrl-Z. Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 26 Chapter 1 Using the Command-Line Interface CLI Command Modes Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 27: Aaa Accounting Dot1X
C H A P T E R Catalyst 3550 Switch Cisco IOS Commands aaa accounting dot1x Use the aaa accounting dot1x global configuration command to enable authentication, authorization, and accounting (AAA) accounting and to create method lists defining specific accounting methods on a per-line or per-interface basis for IEEE 802.1x sessions.
Page 28: Chapter 2 Catalyst 3550 Switch Cisco Io Command
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands aaa accounting dot1x Defaults AAA accounting is disabled. Command Modes Global configuration Command History Release Modification 12.2(20)SE This command was introduced. Usage Guidelines This command requires access to a RADIUS server. We recommend that you enter the dot1x reauthentication interface configuration command before Note configuring IEEE 802.1x RADIUS accounting on an interface.
Page 29: Aaa Authentication Dot1X
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands aaa authentication dot1x aaa authentication dot1x Use the aaa authentication dot1x global configuration command to specify the authentication, authorization, and accounting (AAA) method to use on ports complying with IEEE 802.1x authentication. Use the no form of this command to disable authentication.
Page 30: Aaa Authentication Dot1X
Related Commands Command Description aaa new-model Enables the AAA access control model. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Security Command Reference, Release 12.2 > Authentication, Authorization, and Accounting > Authentication Commands.
Page 31: Aaa Authorization Network
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands aaa authorization network aaa authorization network Use the aaa authorization network global configuration command to the configure the switch to use user-RADIUS authorization for all network-related service requests, such as IEEE 802.1x per-user access control lists (ACLs) or VLAN assignment.
Page 32 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands access-list hardware program nonblocking access-list hardware program nonblocking Use the access-list hardware program nonblocking global configuration command to cause the system to continue to forward frames even while a new security access-control list (ACL) configuration is being programmed into the hardware.
Page 33: Access-List Hardware Program Nonblocking
{deny | permit} Configures a standard numbered ACL. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS IP Command Reference, Volume 1 of 3: Addressing and Services, Release 12.2 > IP Services Commands. action (access map Defines or modifies the action for the VLAN access map entry.
Page 34 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands action action Use the action access map configuration command to set the action for the VLAN access map entry. Use the no form of this command to return to the default setting.
Page 35: Action
{deny | permit} Configures a standard numbered ACL. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS IP Command Reference, Volume 1 of 3: Addressing and Services, Release 12.2 > IP Services Commands. ip access-list Creates a named access list.
Page 36 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands archive download-sw archive download-sw Use the archive download-sw privileged EXEC command to download a new image from a TFTP server to the switch and overwrite or keep the existing image. archive download-sw {/force-reload | /imageonly | /leave-old-sw | /no-set-boot | /overwrite |...
Page 37: Archive Download-Sw
The /imageonly option removes the HTML files for the existing image if the existing image is being removed or replaced. Only the Cisco IOS image (without the HTML files) is downloaded. Using the /safe or /leave-old-sw option can cause the new image download to fail if there is insufficient flash space.
Page 38 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands archive download-sw Related Commands Command Description archive tar Creates a tar file, lists the files in a tar file, or extracts the files from a tar file. archive upload-sw Uploads an existing image on the switch to a server.
Page 39: Archive Tar
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands archive tar archive tar Use the archive tar privileged EXEC command to create a tar file, list files in a tar file, or extract the files from a tar file. archive tar {/create destination-url flash:/file-url} | {/table source-url} | {/xtract source-url flash:/file-url [dir/file...]}...
Page 40: Archive Tar
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands archive tar /table source-url Display the contents of an existing tar file to the screen. For source-url, specify the source URL alias for the local or network file system. These options are supported: The syntax for the local flash file system: •...
Page 41 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands archive tar Examples This example shows how to create a tar file. The command writes the contents of the new-configs directory on the local flash device to a file named saved.tar on the TFTP server at 172.20.10.30: Switch# archive tar /create tftp:172.20.10.30/saved.tar flash:/new-configs...
Page 42 The upload feature is available only if the HTML files associated with the device manager have been installed with the existing image. The files are uploaded in this sequence: info, the Cisco IOS image, the HTML files, and info.ver. After these files are uploaded, the software creates the tar file.
Page 43: Archive Upload-Sw
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands archive upload-sw Related Commands Command Description archive download-sw Downloads a new image to the switch. archive tar Creates a tar file, lists the files in a tar file, or extracts the files from a tar file.
Page 44 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands arp access-list arp access-list Use the arp access-list global configuration command to define an Address Resolution Protocol (ARP) access control list (ACL) or to add clauses to the end of a previously defined list. Use the no form of this command to delete the specified ARP access list.
Page 45: Arp Access-List
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands arp access-list Examples This example shows how to define an ARP access list and to permit both ARP requests and ARP responses from a host with an IP address of 1.1.1.1 and a MAC address of 0000.0000.abcd: Switch(config)# arp access-list static-hosts Switch(config-arp-nacl)# permit ip host 1.1.1.1 mac host 00001.0000.abcd...
Page 46: Auto Qos Voip
Identify this interface as connected to a Cisco IP Phone, and automatically configure QoS for VoIP. The QoS labels of incoming packets are trusted only when the telephone is detected. cisco-softphone Identify this port as connected to a device running the Cisco SoftPhone, and automatically configure QoS for VoIP. trust Identify this interface as connected to a trusted switch or router, and automatically configure QoS for VoIP.
Page 47: Auto Qos Voip
In releases earlier than Cisco IOS Release 12.1(20)EA2, auto-QoS configures the switch only for VoIP with Cisco IP Phones on switch ports. In Cisco IOS Release 12.1(20)EA2 or later, auto-QoS configures the switch for VoIP with Cisco IP Phones on switch and routed ports and for VoIP with devices running the Cisco SoftPhone application.
Page 48 Table 2-2). You can enable auto-QoS on static, dynamic-access, voice VLAN access, and trunk ports. When enabling auto-QoS with a Cisco IP Phone on a routed port, you must assign a static IP address to the IP phone. Note When a device running Cisco SoftPhone is connected to a switch or routed port, the switch supports only one Cisco SoftPhone application per port.
Page 49 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands auto qos voip This example shows how to display the QoS configuration that is automatically generated when auto-QoS is enabled: Switch# debug auto qos AutoQoS debugging is on Switch# configure terminal Enter configuration commands, one per line.
Page 50: Boot Buffersize
You must reload the switch by using the reload privileged EXEC command for this command to take effect. This command changes the setting of the CONFIG_BUFSIZE environment variable. For more information, see Appendix A, “Catalyst 3550 Switch Boot Loader Commands.” Related Commands Command Description show boot Displays the settings of the boot environment variables.
Page 51: Boot Config-File
Use the boot config-file global configuration command to specify the filename that Cisco IOS uses to read and write a nonvolatile copy of the system configuration. Use the no form of this command to return to the default setting.
Page 52: Boot Enable-Break
Despite the setting of this command, you can interrupt the automatic boot process at any time by pressing Note the MODE button on the switch front panel. This command changes the setting of the ENABLE_BREAK environment variable. For more information, see Appendix A, “Catalyst 3550 Switch Boot Loader Commands.” Related Commands Command Description show boot Displays the settings of the boot environment variables.
Page 53: Boot Helper
This command was introduced. Usage Guidelines Filenames and directory names are case sensitive. This command changes the setting of the HELPER environment variable. For more information, see Appendix A, “Catalyst 3550 Switch Boot Loader Commands.” Related Commands Command Description show boot Displays the settings of the boot environment variables.
Page 54: Boot Helper-Config-File
Use the boot helper-config-file global configuration command to specify the name of the configuration file to be used by the Cisco IOS helper image. If this is not set, the file specified by the CONFIG_FILE environment variable is used by all versions of Cisco IOS that are loaded. This variable is used only for internal development and testing.
Page 55: Boot Manual
To boot the system, use the boot boot loader command, and specify the name of the bootable image. This command changes the setting of the MANUAL_BOOT environment variable. For more information, see Appendix A, “Catalyst 3550 Switch Boot Loader Commands.” Related Commands Command Description show boot Displays the settings of the boot environment variables.
Page 56: Boot Private-Config-File
12.1(11)EA1 This command was introduced. Usage Guidelines Only the Cisco IOS software can read and write a copy of the private configuration file. You cannot read, write, delete, or display a copy of this file. Filenames are case sensitive. Examples...
Page 57: Boot System
Use the boot system global configuration command to specify the Cisco IOS image to load during the next boot cycle. Use the no form of this command to return to the default setting. boot system filesystem:/file-url ...
Page 58: Channel-Group
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands channel-group channel-group Use the channel-group interface configuration command to assign an Ethernet interface to an EtherChannel group, to enable an EtherChannel mode, or both. Use the no form of this command to remove an Ethernet interface from an EtherChannel group.
Page 59 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands channel-group Enable on mode. In on mode, a usable EtherChannel exists only when both connected port groups are in the on mode. passive Enable LACP only if a LACP device is detected.
Page 60 If IEEE 802.1x authentication is enabled on a not-yet active port of an EtherChannel in software releases Note earlier than Cisco IOS Release 12.2(25)SE, the port does not join the EtherChannel. Do not configure a secure port as part of an EtherChannel.
Page 61 Display PAgP information. show running-config Displays the current operating configuration. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands > Configuration File Management Commands.
Page 62: Channel-Protocol
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands channel-protocol channel-protocol Use the channel-protocol interface configuration command to configure an EtherChannel for the Port Aggregation Protocol (PAgP) or Link Aggregation Control Protocol (LACP). Use the no form of this command to disable PAgP or LACP on the EtherChannel.
Page 63 Display PAgP information. show running-config Displays the current operating configuration. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands > Configuration File Management Commands.
Page 64: Class
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands class class Use the class policy-map configuration command to define a traffic classification for the policy to act on. Use the no form of this command to delete an existing class map.
Page 65 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands class set: specifies a value to be assigned to the classified traffic. For more information, see the • command. • trust: defines a trust state for traffic classified with the class or the class-map command. For more...
Page 66: Class-Map
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands class-map class-map Use the class-map global configuration command to create a class map to be used for matching packets to the class whose name you specify and to enter class-map configuration mode. Use the no form of this command to delete an existing class map and to return to global configuration mode.
Page 67 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands class-map To define packet classification on a physical-port basis, only one match command per class map is supported. In this situation, the match-all and match-any keywords are equivalent. To define packet classification on a per-port per-VLAN basis, you must use the match-all keyword with the class-map global configuration command.
Page 68: Clear Ip Arp Inspection Log
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands clear ip arp inspection log clear ip arp inspection log Use the clear ip arp inspection log privileged EXEC command to clear the dynamic Address Resolution Protocol (ARP) inspection log buffer. clear ip arp inspection log Syntax Description This command has no arguments or keywords.
Page 69: Clear Ip Arp Inspection Statistics
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands clear ip arp inspection statistics clear ip arp inspection statistics Use the clear ip arp inspection statistics privileged EXEC command to clear the dynamic Address Resolution Protocol (ARP) inspection statistics. clear ip arp inspection statistics [vlan vlan-range]...
Page 70: Clear Ip Dhcp Snooping
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands clear ip dhcp snooping clear ip dhcp snooping Use the clear ip dhcp snooping privileged EXEC command on the switch stack or on a standalone switch to clear the DHCP snooping binding database, the DHCP snooping binding database agent statistics, or the DHCP snooping statistics counters.
Page 71: Clear Ip Dhcp Snooping
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands clear ip dhcp snooping Command Description show ip dhcp snooping database Displays the DHCP snooping binding database agent statistics. show ip dhcp snooping statistics Displays the DHCP snooping statistics. statistics Catalyst 3550 Multilayer Switch Command Reference...
Page 72: Clear L2Protocol-Tunnel Counters
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands clear l2protocol-tunnel counters clear l2protocol-tunnel counters Use the clear l2protocol-tunnel counters privileged EXEC command to clear the protocol counters in protocol tunnel ports. clear l2protocol-tunnel counters [interface-id] Syntax Description interface-id (Optional) Specify interface (physical interface or port channel) on which to clear protocol counters.
Page 73: Clear Lacp
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands clear lacp clear lacp Use the clear lacp privileged EXEC command to clear Link Aggregation Control Protocol (LACP) channel-group counters. clear lacp {channel-group-number [counters]} Syntax Description channel-group-number Channel group number. The range is 1 to 64.
Page 74: Clear Mac Address-Table
VLAN. This command also clears the MAC address notification global counters. clear mac address-table {dynamic [address mac-addr | interface interface-id | vlan vlan-id] | notification} Beginning with Cisco IOS Release 12.1(11)EA1, the clear mac address-table command replaces the Note clear mac- address-table command (with the hyphen).
Page 75 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands clear mac address-table Command Description show mac address-table notification Displays the MAC address notification settings for all interfaces or the specified interface. snmp trap mac-notification Enables the Simple Network Management Protocol (SNMP) MAC address notification trap on a specific interface.
Page 76: Clear Pagp
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands clear pagp clear pagp Use the clear pagp privileged EXEC command to clear Port Aggregation Protocol (PAgP) channel-group information. clear pagp {channel-group-number [counters] | counters} Syntax Description channel-group-number Channel group number. The range is 1 to 64.
Page 77: Clear Port-Security
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands clear port-security clear port-security Use the clear port-security privileged EXEC command to delete from the MAC address table all secure addresses or all secure addresses of a specific type (configured, dynamic, or sticky) on the switch or on an interface.
Page 78 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands clear port-security If you enter the clear port-security dynamic interface interface-id command, the switch removes all dynamic secure MAC addresses on an interface from the MAC address table. If you enter the clear port-security sticky command, the switch removes all sticky secure MAC addresses from the MAC address table.
Page 79: Clear Spanning-Tree Counters
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands clear spanning-tree counters clear spanning-tree counters Use the clear spanning-tree counters privileged EXEC command to clear the spanning-tree counters. clear spanning-tree counters [interface interface-id] Syntax Description interface interface-id (Optional) Clear all spanning-tree counters on the specified interface. If interface-id is not specified, spanning-tree counters are cleared for all interfaces.
Page 80: Clear Spanning-Tree Detected-Protocols
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands clear spanning-tree detected-protocols clear spanning-tree detected-protocols Use the clear spanning-tree detected-protocols privileged EXEC command to restart the protocol migration process (force the renegotiation with neighboring switches) on all interfaces or on the specified interface.
Page 81: Clear Vmps Statistics
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands clear vmps statistics clear vmps statistics Use the clear vmps statistics privileged EXEC command to clear the statistics maintained by the VLAN Query Protocol (VQP) client. clear vmps statistics Syntax Description This command has no arguments or keywords.
Page 82: Clear Vtp Counters
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands clear vtp counters clear vtp counters Use the clear vtp counters privileged EXEC command to clear the VLAN Trunking Protocol (VTP) and pruning counters. clear vtp counters Syntax Description This command has no arguments or keywords.
Page 83: Cluster Commander-Address
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands cluster commander-address cluster commander-address You do not need to enter this command. The command switch automatically provides its MAC address to member switches when these switches join the cluster. The member switch adds this information and other cluster information to its running configuration file.
Page 84 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands cluster commander-address This example shows how to remove a member from the cluster by using the cluster member console: Switch # configure terminal Enter configuration commands, one per line. End with CNTL/Z.
Page 85: Cluster Discovery Hop-Count
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands cluster discovery hop-count cluster discovery hop-count Use the cluster discovery hop-count global configuration command on the command switch to set the hop-count limit for extended discovery of candidate switches. Use the no form of this command to return to the default setting.
Page 86: Cluster Enable
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands cluster enable cluster enable Use the cluster enable global configuration command on a command-capable switch to enable it as the cluster command switch, assign a cluster name, and to optionally assign a member number to it. Use the no form of this command to remove all members and to make the command switch a candidate switch.
Page 87: Cluster Holdtime
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands cluster holdtime cluster holdtime Use the cluster holdtime global configuration command on the command switch to set the duration in seconds before a switch (either the command or member switch) declares the other switch down after not receiving heartbeat messages.
Page 88: Cluster Member
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands cluster member cluster member Use the cluster member global configuration command on the command switch to add candidates to a cluster. Use the no form of this command to remove members from the cluster.
Page 89 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands cluster member This example shows how to add a switch with MAC address 00E0.1E00.3333 to the cluster. This switch does not have a password. The command switch selects the next available member number and assigns it to the switch that is joining the cluster.
Page 90: Cluster Outside-Interface
Command Description show running-config Displays the current operating configuration. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands > Configuration File Management Commands.
Page 91: Cluster Run
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands cluster run cluster run Use the cluster run global configuration command to enable clustering on a switch. Use the no form of this command to disable clustering on a switch. cluster run...
Page 92: Cluster Standby-Group
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands cluster standby-group cluster standby-group Use the cluster standby-group global configuration command to enable command-switch redundancy by binding the cluster to an existing Hot Standby Router Protocol (HSRP). Entering the routing-redundancy keyword enables the same HSRP group to be used for command-switch redundancy and routing redundancy.
Page 93 Command Description standby ip Enables HSRP on the interface. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IP Command Reference, Volume 1 of 3: Addressing and Services, Release 12.2 > IP Services Commands.
Page 94: Cluster Timer
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands cluster timer cluster timer Use the cluster timer global configuration command on the command switch to set the interval in seconds between heartbeat messages. Use the no form of this command to return to the default setting.
Page 95: Define Interface-Range
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands define interface-range define interface-range Use the define interface-range global configuration command to create an interface-range macro. Use the no form of this command to delete the defined macro. define interface-range macro-name interface-range...
Page 96 Executes a command on multiple ports at the same time. show running-config Displays the current operating configuration, including defined macros. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 >...
Page 97: Delete
The prompting behavior depends on the setting of the file prompt global configuration command. By default, the switch prompts for confirmation on destructive file operations. For more information about this command, see the Cisco IOS Command Reference for Release 12.1. Examples...
Page 98: Deny
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands deny deny Use the deny MAC access list configuration command to prevent non-IP traffic from being forwarded if the conditions are matched. Use the no form of this command to remove a deny condition from the named MAC access list.
Page 99: Deny
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands deny (Optional) Select EtherType DEC-LAT. lavc-sca (Optional) Select EtherType DEC-LAVC-SCA. lsap lsap-number mask (Optional) Use the LSAP number (0 to 65535) of a packet with IEEE 802.2 encapsulation to identify the protocol of the packet.
Page 100 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands deny Usage Guidelines You enter MAC-access list configuration mode by using the mac access-list extended global configuration command. If you use the host keyword, you cannot enter an address mask; if you do not use the host keyword, you must enter an address mask.
Page 101: Deny (Arp Access-List Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands deny (ARP access-list configuration) deny (ARP access-list configuration) Use the deny Address Resolution Protocol (ARP) access-list configuration command to deny an ARP packet based on matches against the DHCP bindings. Use the no form of this command to remove the specified access control entry (ACE) from the access list.
Page 102: Deny (Arp Access-List Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands deny (ARP access-list configuration) Command History Release Modification 12.2(25)SEA This command was introduced. Usage Guidelines You can add deny clauses to drop ARP packets based on matching criteria. Examples This example shows how to define an ARP access list and to deny both ARP requests and ARP responses from a host with an IP address of 1.1.1.1 and a MAC address of 0000.0000.abcd:...
Page 103: Dot1X
IEEE 802.1x authentication and EtherChannel are configured. If you are using a device running the Cisco Access Control Server (ACS) application for IEEE 802.1x authentication with EAP-Transparent LAN Services (TLS) and with EAP-MD5 and your switch is running Cisco IOS Release 12.1(14)EA1, make sure that the device is running ACS Version 3.2.1 or...
Page 104 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x Examples This example shows how to enable IEEE 802.1x authentication globally on a switch: Switch(config)# dot1x system-auth-control You can verify your settings by entering the show dot1x privileged EXEC command. Related Commands...
Page 105: Dot1X Auth-Fail Max-Attempts
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x auth-fail max-attempts dot1x auth-fail max-attempts Use the dot1x auth-fail max-attempts interface configuration command to configure the maximum number of authentication attempts allowed before a port is moved to the restricted VLAN. To return to the default setting, use the no form of this command.
Page 106 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x auth-fail max-attempts Command Description dot1x max-reauth-req [count] Sets the maximum number of times that the switch restarts the authentication process before a port changes to the unauthorized state. show dot1x [interface interface-id] Displays IEEE 802.1x status for the specified port.
Page 107: Dot1X Auth-Fail Vlan
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x auth-fail vlan dot1x auth-fail vlan Use the dot1x auth-fail vlan interface configuration command to enable the restricted VLAN on a port. To return to the default setting, use the no form of this command.
Page 108 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x auth-fail vlan When a restricted VLAN port is moved to an unauthorized state, the authentication process is restarted. If the user fails the authentication process again, the authenticator waits in the held state. After the user has correctly re-authenticated, all IEEE 802.1x ports are reinitialized and treated as normal IEEE 802.1x...
Page 109: Dot1X Control-Direction
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x control-direction dot1x control-direction Use the dot1x control-direction interface configuration command to configure the IEEE 802.1x authentication with the wake-on-LAN (WoL) feature to configure the port control as unidirectional or bidirectional. Use the no form of this command to return to the default setting.
Page 110 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x control-direction If you enter the dot1x control-direction in interface configuration command to enable unidirectional control, this appears in the show dot1x all command output: ControlDirection = In If you enter the dot1x control-direction in interface configuration command and the port cannot support...
Page 111: Dot1X Critical (Global Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x critical (global configuration) dot1x critical (global configuration) Use the dot1x critical global configuration command to configure the parameters for the inaccessible authentication bypass feature, also referred to as critical authentication or the authentication, authorization, and accounting (AAA) fail policy.
Page 112: Dot1X Critical (Global Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x critical (global configuration) Related Commands Command Description dot1x critical (interface Enables the inaccessible authentication bypass feature, and configuration) configures the access VLAN for the feature. show dot1x Displays IEEE 802.1x status for the specified port.
Page 113: Dot1X Critical (Interface Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x critical (interface configuration) dot1x critical (interface configuration) Use the dot1x critical interface configuration command to enable the inaccessible authentication bypass feature, also referred to as critical authentication or the authentication, authorization, and accounting (AAA) fail policy.
Page 114: Dot1X Critical (Interface Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x critical (interface configuration) You can configure the inaccessible bypass feature and port security on the same switch port. Examples This example shows how to enable the inaccessible authentication bypass feature on port 1: Switch# configure terminal Enter configuration commands, one per line.
Page 115: Dot1X Default
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x default dot1x default Use the dot1x default interface configuration command to reset the configurable IEEE 802.1x parameters to their default values. dot1x default Syntax Description This command has no arguments or keywords.
Page 116: Dot1X Fallback
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x fallback dot1x fallback Use the dot1xfallback interface configuration command on the switch stack or on a standalone switch to configure a port to use web authentication as a fallback method for clients that do not support IEEE 802.1x authentication.
Page 117: Dot1X Guest-Vlan
VLAN, regardless of whether EAPOL packets had been detected on the interface. In Cisco IOS Release 12.2(25)SE, you can use the dot1x guest-vlan supplicant global configuration command to enable this behavior.
Page 118 The amount to decrease the settings depends on the connected IEEE 802.1x client type. The switch supports MAC authentication bypass in Cisco IOS Release 12.2(25)SEE and later. When MAC authentication bypass is enabled on an IEEE 802.1x port, the switch can authorize clients based on the client MAC address when IEEE 802.1x authentication times out while waiting for an EAPOL...
Page 119: Dot1X Host-Mode
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x host-mode dot1x host-mode Use the dot1x host-mode interface configuration command to allow a single host (client) or multiple hosts on an IEEE 802.1x-authorized port that has the dot1x port-control interface configuration command set to auto.
Page 120: Dot1X Initialize
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x initialize dot1x initialize Use the dot1x initialize privileged EXEC command to manually return an IEEE 802.1x-enabled port to an unauthorized state before initiating a new authentication session on the interface. dot1x initialize interface interface-id Syntax Description This command has no arguments or keywords.
Page 121: Dot1X Mac-Auth-Bypass
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x mac-auth-bypass dot1x mac-auth-bypass Use the dot1x mac-auth-bypass interface configuration command to enable the MAC authentication bypass feature. Use the no form of this command to disable MAC authentication bypass feature. dot1x mac-auth-bypass [eap]...
Page 122 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x mac-auth-bypass You can verify your settings by entering the show dot1x [interface interface-id] privileged EXEC command. Related Commands Command Description show dot1x [interface Displays IEEE 802.1x status for the specified port.
Page 123: Dot1X Max-Reauth-Req
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x max-reauth-req dot1x max-reauth-req Use the dot1x max-reauth-req interface configuration command on the switch stack or on a standalone switch to set the maximum number of times that the switch restarts the authentication process before a port changes to the unauthorized state.
Page 124: Dot1X Max-Req
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x max-req dot1x max-req Use the dot1x max-req interface configuration command to set the maximum number of times that the switch sends an Extensible Authentication Protocol (EAP) frame from the authentication server (assuming that no response is received) to the client before restarting the authentication process.
Page 125: Dot1X Multiple-Hosts
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x multiple-hosts dot1x multiple-hosts This is an obsolete command. In past releases, the dot1x multiple-hosts interface configuration command was used to allow multiple hosts (clients) on an IEEE 802.1x-authorized port. Command History...
Page 126: Dot1X Pae
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x pae dot1x pae Use the dot1x pae interface configuration command to configure the port as an IEEE 802.1x port access entity (PAE) authenticator. Use the no form of this command to disable IEEE 802.1x authentication on the port.
Page 127: Dot1X Port-Control
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x port-control dot1x port-control Use the dot1x port-control interface configuration command to enable manual control of the authorization state of the port. Use the no form of this command to return to the default setting.
Page 128 EtherChannel as an IEEE 802.1x port. If you try to enable IEEE 802.1x authentication on an EtherChannel port, an error message appears, and IEEE 802.1x authentication is not enabled. In software releases earlier than Cisco IOS Release 12.2(25)SE, if IEEE 802.1x Note authentication is enabled on a not-yet active port of an EtherChannel, the port does not join the EtherChannel.
Page 129: Dot1X Re-Authenticate
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x re-authenticate dot1x re-authenticate Use the dot1x re-authenticate privileged EXEC command to manually initiate a re-authentication of the IEEE 802.1x-enabled port. dot1x re-authenticate {interface interface-id} Syntax Description interface interface-id Slot and port number of the interface to re-authenticate.
Page 130: Dot1X Re-Authentication
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x re-authentication dot1x re-authentication This is an obsolete command. In past releases, the dot1x re-authentication global configuration command was used to set the amount of time between periodic re-authentication attempts. Command History...
Page 131: Dot1X Reauthentication
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x reauthentication dot1x reauthentication Use the dot1x reauthentication interface configuration command to enable periodic re-authentication of the client. Use the no form of this command to return to the default setting. dot1x reauthentication...
Page 132: Dot1X Timeout
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x timeout dot1x timeout Use the dot1x timeout interface configuration command to set the IEEE 802.1x timers. Use the no form of this command to return to the default setting. dot1x timeout {quiet-period seconds | ratelimit-period seconds | reauth-period {seconds |...
Page 133: Dot1X Timeout
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x timeout Command History Release Modification 12.1(8)EA1 This command was introduced. 12.1(14)EA1 The supp-timeout and server-timeout keywords were added, and the command was changed to the interface configuration mode. 12.1(22)EA5 The reauth-period server keywords were added 12.2(25)SE...
Page 134 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands dot1x timeout This example shows how to return to the default re-authorization period: Switch(config-if)# no dot1x timeout reauth-period This example shows how to set 30 as the number of seconds that the switch ignores EAPOL packets from...
Page 135: Duplex
The duplex setting remains as configured on each end of the link, which could result in a duplex setting mismatch. Beginning with Cisco IOS Release 12.1(22)EA1, you can configure the duplex setting when the speed is set to auto.
Page 136 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands duplex If both the speed and duplex are set to specific values, autonegotiation is disabled. Caution Changing the interface speed and duplex mode configuration might shut down and re-enable the interface during the reconfiguration.
Page 137: Errdisable Detect Cause
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands errdisable detect cause errdisable detect cause Use the errdisable detect cause global configuration command to enable error disable detection for a specific cause or all causes. Use the no form of this command to disable the error disable detection feature.
Page 138 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands errdisable detect cause Usage Guidelines A cause (dhcp-rate-limit, dtp-flap, and so forth) is defined as the reason why the error-disabled state occurred. When a cause is detected on an interface, the interface is placed in error-disabled state, an operational state similar to link-down state.
Page 139: Errdisable Recovery
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands errdisable recovery errdisable recovery Use the errdisable recovery global configuration command to configure the recover mechanism variables. Use the no form of this command to return to the default setting. errdisable recovery {cause {all | arp-inspection | bpduguard | channel-misconfig |...
Page 140: Errdisable Recovery
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands errdisable recovery Though visible in the command-line help strings, the arp-inspection, storm-control, and unicast-flood Note keywords are not supported. Defaults Recovery is disabled for all causes. The default recovery interval is 300 seconds.
Page 141: Fallback Profile
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands fallback profile fallback profile Use the fallback profile global configuration command on the switch stack or on a standalone switch to create a fallback profile for web authentication. To return to the default setting, use the no form of this command.
Page 142: Fallback Profile
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands fallback profile Command Description ip admission Enable web authentication on a switch port ip admission name proxy http Enable web authentication globally on a switch Catalyst 3550 Multilayer Switch Command Reference 2-116...
Page 143: Flowcontrol
Use the receive off and send off keywords to disable flow control. flowcontrol {receive | send} {desired | off | on} On the Catalyst 3550 switch, Gigabit Ethernet ports can receive and send pause frames; Fast Ethernet Note ports can receive only pause frames. Therefore, for 10/100 ports, the send keyword is not available.
Page 144 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands flowcontrol Usage Guidelines You must not configure both IEEE 802.3z flow control and quality of service (QoS) on a switch. Before configuring flow control on an interface, use the no mls qos global configuration command to disable QoS on the switch.
Page 145 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands flowcontrol Table 2-4 Flow Control Settings and Local and Remote Port Flow Control Resolution (continued) Flow Control Settings Flow Control Resolution Local Device Remote Device Local Device Remote Device send desired/receive on...
Page 146 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands flowcontrol Related Commands Command Description show interfaces Displays interface input and output flow control settings and status. flowcontrol show flowcontrol Displays flow control settings and status for specified interfaces or all interfaces on the switch.
Page 147: Interface Port-Channel
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands interface port-channel interface port-channel Use the interface port-channel global configuration command to access or create the port-channel logical interface for Layer 3 routed interfaces. Use the no form of this command to remove the port-channel.
Page 148 Displays EtherChannel information for a channel. show running-config Displays the current operating configuration. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands > Configuration File Management Commands.
Page 149: Interface Range
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands interface range interface range Use the interface range global configuration command to enter interface range configuration mode and to execute a command on multiple ports at the same time. Use the no form of this command to remove an interface range.
Page 150 Creates an interface range macro. show running-config Displays the configuration information currently running on the switch. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands >...
Page 151: Interface Vlan
For the Catalyst 3550 Gigabit Ethernet switches, the tables are based on 16 routed interfaces (SVIs and routed ports. For switches with mainly Fast Ethernet ports, the tables are based on 8 routed interfaces. For more...
Page 152 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands interface vlan Examples This example shows how to create a new SVI with VLAN ID 23 and enter interface configuration mode: Switch(config)# interface vlan 23 Switch(config-if)# You can verify your setting by entering the...
Page 153: Ip Access-Group
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip access-group ip access-group Use the ip access-group interface configuration command to control access to a Layer 2 or Layer 3 interface. Use the no form of this command to remove all access groups or the specified access group from the interface.
Page 154 Configures a numbered ACL. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS IP Command Reference, Volume 1 of 3: Addressing and Services, Release 12.2 > IP Services Commands. ip access-list Configures a named ACL.
Page 155: Ip Address
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip address ip address Use the ip address interface configuration command to set an IP address for the Layer 2 switch or an IP address for each switch virtual interface (SVI) or routed port on the Layer 3 switch. Use the no form of this command to remove an IP address or to disable IP processing.
Page 156 You can use the sdm prefer global configuration command to reallocate system hardware resources based on templates and feature tables. For the Catalyst 3550 Gigabit Ethernet switches, the tables are based on 16 routed interfaces (SVIs and routed ports. For switches with mainly Fast Ethernet ports, the tables are based on 8 routed interfaces.
Page 157: Ip Admission
Description show running-config Displays the running configuration on the switch. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands > Configuration File Management Commands.
Page 158 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip admission Command Description ip admission name Enable web authentication globally on a switch proxy http show ip admission Displays information about NAC cached entries or the NAC configuration. For more information, see the Network Admission Control Software Configuration Guide on Cisco.com.
Page 159: Ip Admission Name Proxy Http
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip admission name proxy http ip admission name proxy http Use the ip admission name proxy http global configuration command to enable web authentication. Use the no form of this command to disable web authentication.
Page 160: Ip Admission Name Proxy Http
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip admission name proxy http Related Commands Command Description dot1x fallback Configure a port to use web authentication as a fallback method for clients that do not support IEEE 802.1x authentication. fallback profile Create a web authentication fallback profile.
Page 161: Ip Arp Inspection Filter Vlan
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip arp inspection filter vlan ip arp inspection filter vlan Use the ip arp inspection filter vlan global configuration command to permit or deny Address Resolution Protocol (ARP) requests and responses from a host configured with a static IP address when dynamic ARP inspection is enabled.
Page 162 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip arp inspection filter vlan Examples This example shows how to apply the ARP ACL static-hosts to VLAN 1 for dynamic ARP inspection: Switch(config)# ip arp inspection filter static-hosts vlan 1 You can verify your settings by entering the show ip arp inspection vlan 1 privileged EXEC command.
Page 163: Ip Arp Inspection Limit
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip arp inspection limit ip arp inspection limit Use the ip arp inspection limit interface configuration command to limit the rate of incoming Address Resolution Protocol (ARP) requests and responses on an interface. It prevents dynamic ARP inspection from using all of the switch resources if a denial-of-service occurs.
Page 164: Ip Arp Inspection Limit
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip arp inspection limit The rate of incoming ARP packets on EtherChannel ports equals to the sum of the incoming rate of ARP packets from all the channel members. Configure the rate limit for EtherChannel ports only after examining the rate of incoming ARP packets on all the channel members.
Page 165: Ip Arp Inspection Log-Buffer
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip arp inspection log-buffer ip arp inspection log-buffer Use the ip arp inspection log-buffer global configuration command to configure the dynamic Address Resolution Protocol (ARP) inspection logging buffer. Use the no form of this command to return to the default settings.
Page 166 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip arp inspection log-buffer Examples This example shows how to configure the logging buffer to hold up to 45 entries: Switch(config)# ip arp inspection log-buffer entries 45 This example shows how to configure the logging rate to 20 log entries per 4 seconds. With this configuration, the switch generates system messages for five entries every second while there are entries in the log buffer.
Page 167: Ip Arp Inspection Trust
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip arp inspection trust ip arp inspection trust Use the ip arp inspection trust interface configuration command to configure an interface trust state that determines which incoming Address Resolution Protocol (ARP) packets are inspected. Use the no form of this command to return to the default setting.
Page 168: Ip Arp Inspection Trust
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip arp inspection trust Related Commands Command Description ip arp inspection Configures the dynamic ARP inspection logging buffer. log-buffer show ip arp inspection Displays the trust state and the rate limit of ARP packets for the specified interfaces interface or all interfaces.
Page 169: Ip Arp Inspection Validate
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip arp inspection validate ip arp inspection validate Use the ip arp inspection validate global configuration command to perform specific checks for dynamic Address Resolution Protocol (ARP) inspection. Use the no form of this command to return to the default settings.
Page 170: Ip Arp Inspection Validate
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip arp inspection validate Examples This example show how to enable source MAC validation: Switch(config)# ip arp inspection validate src-mac You can verify your setting by entering the show ip arp inspection vlan vlan-range privileged EXEC command.
Page 171: Ip Arp Inspection Vlan
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip arp inspection vlan ip arp inspection vlan Use the ip arp inspection vlan global configuration command to enable dynamic Address Resolution Protocol (ARP) inspection on a per-VLAN basis. Use the no form of this command to return to the default setting.
Page 172: Ip Arp Inspection Vlan Logging
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip arp inspection vlan logging ip arp inspection vlan logging Use the ip arp inspection vlan logging global configuration command to control the type of packets that are logged per VLAN. Use the no form of this command to disable this logging control.
Page 173: Ip Arp Inspection Vlan Logging
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip arp inspection vlan logging The acl-match and dhcp-bindings keywords merge with each other; that is, when you configure an ACL match, the DHCP bindings configuration is not disabled. Use the no form of the command to reset the logging criteria to their defaults.
Page 174: Ip Dhcp Snooping
The previous version uses the snmp-ifindex circuit ID and remote ID suboption. If you have option 82 configured on the switch and you upgrade to Cisco IOS Release 12.1(19)EA1 or later, the option-82 configuration is not affected. However, when you enable DHCP snooping globally on the switch by using the ip dhcp snooping global configuration command, the previous option-82 configuration is suspended, and the new option-82 format is applied.
Page 175 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip dhcp snooping Related Commands Command Description ip dhcp snooping vlan Enables DHCP snooping on a VLAN. show ip dhcp snooping Displays the DHCP snooping configuration. show ip dhcp snooping binding Displays the DHCP snooping binding information.
Page 176: Ip Dhcp Snooping Binding
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip dhcp snooping binding ip dhcp snooping binding Use the ip dhcp snooping binding privileged EXEC command to configure the DHCP snooping binding database and to add binding entries to the database. Use the no form of this command to delete entries from the binding database.
Page 177: Ip Dhcp Snooping Binding
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip dhcp snooping binding Examples This example shows how to generate a DHCP binding configuration with an expiration time of 1000 seconds on a port in VLAN 1: Switch# ip dhcp snooping binding 0001.1234.1234 vlan 1 172.20.50.5 interface...
Page 178: Ip Dhcp Snooping Database
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip dhcp snooping database ip dhcp snooping database Use the ip dhcp snooping database global configuration command to configure the DHCP snooping binding database agent. Use the no form of this command to disable the agent, to reset the timeout value, or to reset the write-delay value.
Page 179 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip dhcp snooping database Usage Guidelines The DHCP snooping binding database can have up to 8192 bindings. To ensure that the lease time in the database is accurate, we recommend that Network Time Protocol...
Page 180: Ip Dhcp Snooping Information Option
The switch removes the option-82 field and forwards the packet to the switch port that connects to the DHCP host that sent the DHCP request. In Cisco IOS Release 12.1(19)EA1, the implementation for the option-82 subscriber identification changed from the previous release. The new option-82 format uses a different circuit ID and remote ID suboption, vlan-mod-port.
Page 181 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip dhcp snooping information option Examples This example shows how to enable DHCP option-82 data insertion: Switch(config)# ip dhcp snooping information option You can verify your settings by entering the show ip dhcp snooping privileged EXEC command.
Page 182: Ip Dhcp Snooping Information Option Allow-Untrusted
This command was introduced. Usage Guidelines In Cisco IOS Release 12.1(22)EA3 and in Cisco IOS Release 12.2(25)SEA or later, you might want an edge switch to which a host is connected to insert DHCP option-82 information at the edge of your network.
Page 183 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip dhcp snooping information option allow-untrusted Examples This example shows how to configure an access switch to not check the option-82 information in untrusted packets from an edge switch and to accept the packets: Switch(config)# ip dhcp snooping information option allow-untrusted You can verify your settings by entering the show ip dhcp snooping privileged EXEC command.
Page 184: Ip Dhcp Snooping Information Option Format Remote-Id
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip dhcp snooping information option format remote-id ip dhcp snooping information option format remote-id Use the ip dhcp snooping information option format remote-id global configuration command on the switch to configure the option-82 remote-ID suboption. Use the no form of this command to configure the default remote-ID suboption.
Page 185 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip dhcp snooping information option format remote-id Related Commands Command Description ip dhcp snooping vlan information Configures the option-82 circuit-ID suboption. option format-type circuit-id string show ip dhcp snooping Displays the DHCP snooping configuration.
Page 186: Ip Dhcp Snooping Information Option Format Snmp-Ifindex
This command was introduced. Usage Guidelines If you have option 82 configured on the switch and you upgrade to Cisco IOS Release 12.1(19)EA1 or later, the option 82 configuration is not affected. However, when you enable DHCP snooping globally on the switch by using the ip dhcp snooping global configuration command, the relay agent information option configuration is disabled.
Page 187: Ip Dhcp Snooping Limit Rate
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip dhcp snooping limit rate ip dhcp snooping limit rate Use the ip dhcp snooping limit rate interface configuration command to configure the number of DHCP messages an interface can receive per second. Use the no form of this command to return to the default setting.
Page 188: Ip Dhcp Snooping Limit Rate
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip dhcp snooping limit rate Related Commands Command Description errdisable recovery Configures the recover mechanism. show ip dhcp snooping Displays the DHCP snooping configuration. show ip dhcp snooping binding Displays the DHCP snooping binding information.
Page 189: Ip Dhcp Snooping Trust
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip dhcp snooping trust ip dhcp snooping trust Use the ip dhcp snooping trust interface configuration command to configure a port as trusted for DHCP snooping purposes. Use the no form of this command to return to the default setting.
Page 190: Ip Dhcp Snooping Verify
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip dhcp snooping verify ip dhcp snooping verify Use the ip dhcp snooping verify global configuration command to configure the switch to verify on an untrusted port that the source MAC address in a DHCP packet matches the client hardware address. Use the no form of this command to configure the switch to not verify the MAC addresses.
Page 191: Ip Dhcp Snooping Vlan
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip dhcp snooping vlan ip dhcp snooping vlan Use the ip dhcp snooping vlan global configuration command to enable DHCP snooping on a VLAN. Use the no form of this command to disable DHCP snooping on a VLAN.
Page 192: Ip Dhcp Snooping Vlan Information Option Format-Type Circuit-Id String
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip dhcp snooping vlan information option format-type circuit-id string ip dhcp snooping vlan information option format-type circuit-id string Use the ip dhcp snooping information option format-type circuit-id interface configuration command on the switch to configure the option-82 circuit-ID suboption. Use the no form of this command to configure the default circuit-ID suboption.
Page 193: Ip Dhcp Snooping Vlan Information Option Format-Type Circuit-Id String
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip dhcp snooping vlan information option format-type circuit-id string Examples This example shows how to configure the option-82 circuit-ID suboption: Switch(config-if)# ip dhcp snooping vlan 250 information option format-type circuit-id customerABC-250-0-0 You can verify your settings by entering the show ip dhcp snooping user EXEC command.
Page 194: Ip Igmp Filter
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp filter ip igmp filter Use the ip igmp filter interface configuration command to control whether or not all hosts on a Layer 2 interface can join one or more IP multicast groups by applying an Internet Group Management Protocol (IGMP) profile to the interface.
Page 195 Displays the running configuration on the switch interface, the IGMP interface-id profile (if any) that is applied to an interface. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands >...
Page 196: Ip Igmp Max-Groups
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp max-groups ip igmp max-groups Use the ip igmp max-groups interface configuration command to set the maximum number of Internet Group Management Protocol (IGMP) groups that a Layer 2 interface can join or to configure the IGMP throttling action when the maximum number of entries is in the forwarding table.
Page 197 Displays the running configuration on the switch interface, including interface-id the maximum number of IGMP groups that an interface can join and the throttling action. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 >...
Page 198: Ip Igmp Profile
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp profile ip igmp profile Use the ip igmp profile global configuration command to create an Internet Group Management Protocol (IGMP) profile and enter igmp profile configuration mode. From this mode, you can specify the configuration of the IGMP profile to be used for filtering IGMP membership reports from a switchport.
Page 199 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp profile Related Commands Command Description ip igmp filter Applies the IGMP profile to the specified interface. show ip igmp profile Displays the characteristics of all IGMP profiles or the specified IGMP profile number.
Page 200: Ip Igmp Snooping
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping ip igmp snooping Use the ip igmp snooping global configuration command to globally enable Internet Group Management Protocol (IGMP) snooping on the switch or to enable it on a per-VLAN basis. Use the no form of this command to return to the default setting.
Page 201 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping Command Description show ip igmp snooping mrouter Displays the IGMP snooping router ports. show ip igmp snooping querier Displays the configuration and operation information for the IGMP querier configured on a switch.
Page 202: Ip Igmp Snooping Last-Member-Query-Interval
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping last-member-query-interval ip igmp snooping last-member-query-interval Use the ip igmp snooping last-member-query-interval global configuration command to enable the Internet Group Management Protocol (IGMP) configurable-leave timer globally or on a per-VLAN basis.
Page 203 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping last-member-query-interval Related Commands Command Description ip igmp snooping Enables IGMP snooping on the switch or on a VLAN. ip igmp snooping vlan immediate-leave Enables IGMP Immediate-Leave processing. ip igmp snooping vlan mrouter Configures a Layer 2 port as a multicast router port.
Page 204: Ip Igmp Snooping Querier
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping querier ip igmp snooping querier Use the ip igmp snooping querier global configuration command to globally enable the Internet Group Management Protocol (IGMP) querier function in Layer 2 networks. Use the command with keywords to enable and configure the IGMP querier feature on a VLAN interface.
Page 205: Ip Igmp Snooping Querier
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping querier Usage Guidelines Use this command to enable IGMP snooping to detect the IGMP version and IP address of a device that sends IGMP query messages, which is also called a querier.
Page 206: Ip Igmp Snooping Report-Suppression
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping report-suppression ip igmp snooping report-suppression Use the ip igmp snooping report-suppression global configuration command to enable Internet Group Management Protocol (IGMP) report suppression. Use the no form of this command to disable IGMP report suppression and to forward all IGMP reports to multicast routers.
Page 207 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping report-suppression Related Commands Command Description ip igmp snooping Enables IGMP snooping on the switch or on a VLAN. show ip igmp snooping Displays the IGMP snooping configuration of the switch or the VLAN.
Page 208: Ip Igmp Snooping Source-Only-Learning Age-Timer
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping source-only-learning age-timer ip igmp snooping source-only-learning age-timer Use the ip igmp snooping source-only-learning age-timer global configuration command to enable and configure the aging time of the forward-table entries that the switch learns by using the source-only learning method.
Page 209 | include Displays the configuration information running on the switch. For source-only-learning syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands > Configuration File Management Commands.
Page 210: Ip Igmp Snooping Tcn
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping tcn ip igmp snooping tcn Use the ip igmp snooping tcn global configuration command to configure the Internet Group Management Protocol (IGMP) Topology Change Notification (TCN) behavior. Use the no form of this command to return to the default settings.
Page 211: Ip Igmp Snooping Tcn Flood
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping tcn Related Commands Command Description ip igmp snooping Enables IGMP snooping on the switch or on a VLAN. ip igmp snooping tcn flood Specifies flooding on an interface as the IGMP snooping spanning-tree TCN behavior.
Page 212: Ip Igmp Snooping Tcn Flood
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping tcn flood ip igmp snooping tcn flood Use the ip igmp snooping tcn flood interface configuration command to specify multicast flooding as the Internet Group Management Protocol (IGMP) snooping spanning-tree Topology Change Notification (TCN) behavior.
Page 213: Ip Igmp Snooping Vlan Immediate-Leave
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping vlan immediate-leave ip igmp snooping vlan immediate-leave Use the ip igmp snooping immediate-leave global configuration command to enable Internet Group Management Protocol (IGMP) snooping immediate-leave processing on a per-VLAN basis. Use the no form of this command to return to the default setting.
Page 214: Ip Igmp Snooping Vlan Mrouter
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping vlan mrouter ip igmp snooping vlan mrouter Use the ip igmp snooping mrouter global configuration command to add a multicast router port or to configure the multicast learning method. Use the no form of this command to return to the default settings.
Page 215: Ip Igmp Snooping Vlan Mrouter
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping vlan mrouter Examples This example shows how to configure an interface as a multicast router port: Switch(config)# ip igmp snooping vlan 1 mrouter interface gigabitethernet0/2 This example shows how to specify the multicast router learning method as CGMP: Switch(config)# ip igmp snooping vlan 1 mrouter learn cgmp You can verify your settings by entering the show ip igmp snooping privileged EXEC command.
Page 216: Ip Igmp Snooping Vlan Static
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping vlan static ip igmp snooping vlan static Use the ip igmp snooping static global configuration command to enable Internet Group Management Protocol (IGMP) snooping and to statically add a Layer 2 port as a member of a multicast group. Use the no form of this command to remove ports specified as members of a static multicast group.
Page 217: Ip Igmp Snooping Vlan Static
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip igmp snooping vlan static Related Commands Command Description ip igmp snooping report-suppression Enables IGMP report suppression. show ip igmp snooping Displays the snooping configuration. show ip igmp snooping groups Displays IGMP snooping multicast information.
Page 218: Ip Source Binding
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip source binding ip source binding Use the ip source binding global configuration command to configure static IP source bindings on the switch. Use the no form of this command to delete static bindings.
Page 219 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip source binding Command Description show ip source binding Displays the IP source bindings on the switch. show ip verify source Displays the IP source guard configuration on the switch or on a specific interface.
Page 220: Ip Ssh
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip ssh ip ssh Use the ip ssh global configuration command to configure the switch to run Secure Shell (SSH) version 1 or SSH version 2. Use the no form of this command to return to the default setting.
Page 221 Cisco IOS Security Command Reference, Release 12.2 > Other Security Features > Secure Shell Commands. show ssh Displays the status of the SSH server. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Security Command Reference, Release 12.2 > Other Security Features >...
Page 222: Ip Verify Source
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip verify source ip verify source Use the ip verify source interface configuration command to enable IP source guard on an interface. Use the no form of this command to disable IP source guard.
Page 223: Ip Vrf (Global Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands ip vrf (global configuration) ip vrf (global configuration) Use the ip-vrf global configuration command to configure a Virtual Private Network (VPN) routing/forwarding (VRF) routing table and to enter VRF configuration mode. Use the no form of this command to remove a VRF routing table and to return to global configuration mode.
Page 224: Ip Vrf (Global Configuration)
IP address and an arbitrary number. The ip vrf vrf-name command creates a VRF routing table and a Cisco Express Forwarding (CEF) forwarding table, both named vrf-name. Associated with these tables is the default route distinguisher value route-distinguisher.
Page 225 Displays the IP routing table associated with a VRF. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Switching Services Command Reference, Release 12.2. show ip vrf Displays display the set of defined VRFs and associated interfaces.
Page 226: Ip Vrf (Interface Configuration)
Configures a VRF routing table. configuration) ip route vrf Establishes static routes for a VRF. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Switching Services Command Reference, Release 12.2. Catalyst 3550 Multilayer Switch Command Reference...
Page 227: Ip Vrf (Interface Configuration)
Command Description show ip route vrf Displays the IP routing table associated with a VRF. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Switching Services Command Reference, Release 12.2. show ip vrf Displays display the set of defined VRFs and associated interfaces.
Page 228: L2Protocol-Tunnel
Use the l2protocol-tunnel interface configuration command to enable tunneling of Layer 2 protocols on an access or IEEE 802.1Q tunnel port or on a port channel. You can enable tunneling for Cisco Discovery Protocol (CDP), Spanning Tree Protocol (STP), or VLAN Trunking Protocol (VTP) packets.
Page 229 When protocol tunneling is enabled, protocol packets are encapsulated with a well-known Cisco multicast address for transmission across the network. When the packets reach their destination, the well-known MAC address is replaced by the Layer 2 protocol MAC address.
Page 230 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands l2protocol-tunnel When the drop threshold is reached, the interface drops Layer 2 protocol packets until the rate at which they are received is below the drop threshold. The configuration is saved in NVRAM.
Page 231: L2Protocol-Tunnel Cos
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands l2protocol-tunnel cos l2protocol-tunnel cos Use the l2protocol-tunnel cos global configuration command to configure class of service (CoS) value for all tunneled Layer 2 protocol packets. Use the no form of this command to return to the default setting.
Page 232: Lacp Port-Priority
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands lacp port-priority lacp port-priority Use the lacp port-priority interface configuration command to set the port priority for the Link Aggregation Control Protocol (LACP). Use the no form of this command to return to the default setting.
Page 233 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands lacp port-priority Examples This example shows set the port priority for LACP: Switch(config)# lacp port-priority 32764 You can verify your settings by entering the show etherchannel privileged EXEC command. Related Commands Command...
Page 234: Lacp System-Priority
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands lacp system-priority lacp system-priority Use the lacp system-priority global configuration command to set the system priority for Link Aggregation Control Protocol (LACP). Use the no form of this command to return to the default setting.
Page 235 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands lacp system-priority Related Commands Command Description lacp port-priority Sets the LACP priority for a specific port. Catalyst 3550 Multilayer Switch Command Reference 2-209 OL-8566-02...
Page 236: Logging Event
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands logging event logging event Use the logging event interface configuration command to enable notification of interface link status changes. Use the no form of this command to disable notification. logging event {bundle-status | link-status | spanning-tree | status | trunk status}...
Page 237: Logging File
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands logging file logging file Use the logging file global configuration command to set logging file parameters. Use the no form of this command to return to the default setting. logging file flash:filename [max-file-size] [min-file-size] [severity-level-number | type]...
Page 238: Logging File
Description show running-config Displays the running configuration on the switch. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands > Configuration File Management Commands.
Page 239: Mac Access-Group
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mac access-group mac access-group Use the mac access-group interface configuration command to apply a MAC access control list (ACL) to a Layer 2 interface. Use the no form of this command to remove all MAC ACLs or the specified ACL from the interface.
Page 240 Displays the MAC ACLs configured on the switch. show running-config Displays the running configuration on the switch. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands >...
Page 241: Mac Access-List Extended
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mac access-list extended mac access-list extended Use the mac access-list extended global configuration command to create an access list based on MAC addresses for non-IP traffic. Using this command puts you in the extended MAC access list configuration mode.
Page 242 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mac access-list extended This example shows how to delete MAC named extended access list mac1: Switch(config)# no mac access-list extended mac1 You can verify your settings by entering the show access-lists privileged EXEC command.
Page 243: Mac Address-Table Aging-Time
The aging time applies to all VLANs or a specified VLAN. mac address-table aging-time {0 | 10-1000000} [vlan vlan-id] no mac address-table aging-time {0 | 10-1000000} [vlan vlan-id] Beginning with Cisco IOS Release 12.1(11)EA1, the mac address-table aging-time command replaces Note the mac-address-table aging-time command (with the hyphen).
Page 244: Mac Address-Table Notification
Use the no form of this command to return to the default setting. mac address-table notification [history-size value] | [interval value] no mac address-table notification [history-size | interval] Beginning with Cisco IOS Release 12.1(11)EA1, the mac address-table notification command replaces Note the mac-address-table notification command (with the hyphen).
Page 245 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mac address-table notification Examples This example shows how to enable the MAC address-table notification feature, set the interval time to 60 seconds, and set the history-size to 100 entries: Switch(config)# mac address-table notification...
Page 246: Mac Address-Table Static
Use the no form of this command to remove static entries from the table. mac address-table static mac-addr vlan vlan-id interface interface-id no mac address-table static mac-addr vlan vlan-id [interface interface-id] Beginning with Cisco IOS Release 12.1(11)EA1, the mac address-table static command replaces the Note mac-address-table static command (with the hyphen).
Page 247: Mac Address-Table Static Drop
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mac address-table static drop mac address-table static drop Use the mac address-table static drop global configuration command to enable unicast MAC address filtering and to configure the switch to drop traffic with a specific source or destination MAC address.
Page 248: Mac Address-Table Static Drop
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mac address-table static drop Examples This example shows how to enable unicast MAC address filtering and to configure the switch to drop packets that have a source or destination address of c2f3.220a.12f4. When a packet is received in VLAN 4 with this MAC address as its source or destination, the packet is dropped: Switch(config)# mac address-table static c2f3.220a.12f4 vlan 4 drop...
Page 249: Macro Apply
There are Cisco-default Smartports macros embedded in the switch software. You can display these macros and the commands they contain by using the show parser macro user EXEC command.
Page 250: Macro Apply
Applying command...‘duplex auto’ %Error Unknown error. Applying command...‘speed nonegotiate’ This example shows how to display the Cisco-default cisco-desktop macro and how to apply the macro and set the access VLAN ID to 25 on an interface: Switch# show parser macro cisco-desktop...
Page 251 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands macro apply # Ensure port-security age is greater than one minute # and use inactivity timer switchport port-security violation restrict switchport port-security aging time 2 switchport port-security aging type inactivity # Configure port as an edge network port...
Page 252: Macro Description
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands macro description macro description Use the macro description interface configuration command to enter a description about which macros are applied to an interface. Use the no form of this command to remove the description.
Page 253: Macro Global
There are Cisco-default Smartports macros embedded in the switch software. You can display these macros and the commands they contain by using the show parser macro user EXEC command.
Page 254: Macro Global
Cisco-default macro with the required values by using the parameter value keywords. The Cisco-default macros use the $ character to help identify required keywords. There is no restriction on using the $ character to define keywords when you create a macro.
Page 255 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands macro global Command Description macro name Creates a macro. show parser macro Displays the macro definition for all macros or for the specified macro. Catalyst 3550 Multilayer Switch Command Reference 2-229 OL-8566-02...
Page 256: Macro Global Description
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands macro global description macro global description Use the macro global description global configuration command to enter a description about the macros that are applied to the switch. Use the no form of this command to remove the description.
Page 257: Macro Name
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands macro name macro name Use the macro name global configuration command to create a configuration macro. Use the no form of this command to delete the macro definition. macro name macro-name no macro name macro-name...
Page 258 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands macro name Examples This example shows how to create a macro that defines the duplex mode and speed: Switch(config)# macro name duplex Enter macro commands one per line. End with the character ‘@’.
Page 259: Match (Access-Map Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands match (access-map configuration) match (access-map configuration) Use the match access-map configuration command to set the VLAN map to match packets against one or more access lists. Use the no form of this command to remove the match parameters.
Page 260: Match (Access-Map Configuration)
Configures a standard numbered ACL. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS IP Command Reference, Volume 1 of 3: Addressing and Services, Release 12.2 > IP Services Commands. action Specifies the action to be taken if the packet matches an entry in an access control list (ACL).
Page 261: Match (Class-Map Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands match (class-map configuration) match (class-map configuration) Use the match class-map configuration command to define the match criteria to classify traffic. Use the no form of this command to remove the match criteria.
Page 262: Match (Class-Map Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands match (class-map configuration) To define packet classification on a per-port per-VLAN basis, follow these guidelines: You must use the match-all keyword with the class-map global configuration command to imply • the Logical-AND of all matching statements under this class map.
Page 263 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands match (class-map configuration) This example shows how to delete the IP-precedence match criteria and to classify traffic with acl1: Switch(config)# class-map class2 Switch(config-cmap)# match ip precedence 5 6 7 Switch(config-cmap)# no match ip precedence...
Page 264: Mls Aclmerge Delay
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls aclmerge delay mls aclmerge delay Use the mls aclmerge delay global configuration command to adjust the time required for access control list (ACL) configuration to be stable before the system performs ACL merges and ternary content addressable memory (TCAM) updates.
Page 265 {deny | permit} Configures a standard numbered ACL. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS IP Command Reference, Volume 1 of 3: Addressing and Services, Release 12.2 > IP Services Commands.
Page 266: Mls Qos
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos mls qos Use the mls qos global configuration command to enable quality of service (QoS) for the entire switch. When the mls qos command is entered, QoS is enabled with the default parameters on all ports in the system.
Page 267 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos Table 2-6 shows the default QoS settings when QoS is enabled. Table 2-6 Default QoS Configuration when QoS is Enabled Egress traffic Port (DSCP and CoS Queue Tail-drop CoS Mapping...
Page 268 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos Policy-maps and class-maps used to configure QoS are not deleted from the configuration by the no mls qos command, but entries corresponding to policy maps are removed from the switch hardware to save system resources.
Page 269: Mls Qos Aggregate-Policer
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos aggregate-policer mls qos aggregate-policer Use the mls qos aggregate-policer global configuration command to define policer parameters, which can be shared by multiple classes within the same policy map. Use the no form of this command to delete an aggregate policer.
Page 270 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos aggregate-policer You cannot delete an aggregate policer if it is being used in a policy map. You must first use the no police aggregate aggregate-policer-name policy-map class configuration command to delete the aggregate policer from all policy maps before using the no mls qos aggregate-policer aggregate-policer-name command.
Page 271: Mls Qos Cos
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos cos mls qos cos Use the mls qos cos interface configuration command to define the default class of service (CoS) value of a port or assign the default CoS to all incoming packets on the port. Use the no form of this command to return to the default setting.
Page 272 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos cos This example shows how to assign all the packets entering a port to the default port CoS value of 4: Switch(config)# interface gigabitethernet0/1 Switch(config-if)# mls qos cos 4 Switch(config-if)# mls qos cos override You can verify your settings by entering the show mls qos interface privileged EXEC command.
Page 273: Mls Qos Cos Policy-Map
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos cos policy-map mls qos cos policy-map Use the mls qos cos policy-map global configuration command to set the class of service (CoS) value of a port in a policy map. Use the no form of this command to return to the default setting.
Page 274 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos cos policy-map Command Description Classifies IP traffic by setting a CoS, DSCP, or IP-precedence value in the packet. show policy-map Displays quality of service (QoS) policy maps. trust Defines a trust state for traffic classified by the class policy-map configuration or the class-map global configuration command.
Page 275: Mls Qos Dscp-Mutation
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos dscp-mutation mls qos dscp-mutation Use the mls qos dscp-mutation interface configuration command to apply a Differentiated Services Code Point (DSCP)-to-DSCP-mutation map to a DSCP-trusted port. Use the no form of this command to return the DSCP-to-DSCP-mutation map to the default settings (no DSCP mutation).
Page 276 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos dscp-mutation This example shows how to remove the DSCP-to-DSCP-mutation map name dscpmutation1 from the port and to reset the map to the default: Switch(config-if)# no mls qos dscp-mutation dscpmutation1 You can verify your settings by entering the show mls qos maps privileged EXEC command.
Page 277: Mls Qos Map
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos map mls qos map Use the mls qos map global configuration command to define the class of service (CoS)-to-Differentiated Services Code Point (DSCP) map, DSCP-to-CoS map, the DSCP-to-DSCP-mutation map, the DSCP-to-switch-priority map, the IP-precedence-to-DSCP map, and the policed-DSCP map.
Page 278 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos map Defaults Table 2-7 shows the default CoS-to-DSCP map: Table 2-7 Default CoS-to-DSCP Map CoS Value DSCP Value Table 2-8 shows the default DSCP-to-CoS map: Table 2-8 Default DSCP-to-CoS Map...
Page 279 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos map Table 2-10 shows the default IP-precedence-to-DSCP map: Table 2-10 Default IP-Precedence-to-DSCP Map IP Precedence Value DSCP Value The default DSCP-to-DSCP-mutation map is a null map, which maps an incoming DSCP value to the same DSCP value.
Page 280 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos map Switch(config)# mls qos map dscp-cos 20 21 22 23 24 to 1 Switch(config)# mls qos map dscp-cos 10 11 12 13 14 15 16 17 to 0 This example shows how to define the CoS-to-DSCP map. CoS values 0 to 7 are mapped to DSCP values...
Page 281: Mls Qos Min-Reserve
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos min-reserve mls qos min-reserve Use the mls qos min-reserve global configuration command to configure the size of the minimum-reserve levels (segments) on all 10/100 Ethernet ports. Use the no form of this command to return to the default setting.
Page 282: Mls Qos Monitor
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos monitor mls qos monitor Use the mls qos monitor interface configuration command to define up to eight Differentiated Services Code Point (DSCP) values per command for which byte or packet statistics are gathered by hardware.
Page 283: Mls Qos Monitor
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos monitor Related Commands Command Description show mls qos interface Displays all the DSCPs for which statistics are maintained and the corresponding ingress and egress statistics, including the number of bytes dropped, when the statistics keyword is appended.
Page 284: Mls Qos Trust
(DSCP), class of service (CoS), or IP-precedence packet field. Use the no form of this command to return a port to its untrusted state. mls qos trust [cos [pass-through dscp] | device cisco-phone | dscp [pass-through cos] | ip-precedence] no mls qos trust [cos [pass-through] | device | dscp [pass-through] | ip-precedence] Syntax Description (Optional) Classify ingress packets with packet CoS values.
Page 285 The trusted boundary feature prevents security problems if users disconnect their PCs from networked Cisco IP phones and connect them to the switch port to take advantage of trusted CoS or DSCP settings. You must globally enable the Cisco Discovery Protocol (CDP) on the switch and on the port connected to the IP phone.
Page 286 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mls qos trust Related Commands Command Description mls qos cos Defines the default CoS value of a port or assigns the default CoS to all incoming packets on the port. mls qos dscp-mutation Applies a DSCP-to DSCP-mutation map to a DSCP-trusted port.
Page 287: Monitor Session
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands monitor session monitor session Use the monitor session global configuration command to start a new Switched Port Analyzer (SPAN) or Remote SPAN (RSPAN) session, to add or delete interfaces or VLANs to or from an existing SPAN or RSPAN session, and to limit (filter) SPAN source traffic to specific source VLANs.
Page 288 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands monitor session (Optional) Specify a series of interfaces or VLANs, or separate a range of interfaces or VLANs from a previous range. Enter a space after the comma. For source interface, you can configure the first port to monitor Note egress traffic;...
Page 289 If ingress forwarding is enabled, you can use the SPAN or RSPAN destination port to inject traffic from a network security device. For example, if you connect a Cisco Intrusion Detection System (IDS) Sensor Appliance to a destination port, the IDS device can send TCP Reset packets to close down the TCP session of a suspected attacker.
Page 290 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands monitor session Switch(config)# monitor session 1 destination remote vlan 901 reflector-port fastethernet 0/1 Switch(config)# end This example shows how to configure the destination port for ingress traffic on VLAN 5 by using a security device that does not support IEEE 802.1Q encapsulation:...
Page 291: Mvr (Global Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mvr (global configuration) mvr (global configuration) Use the mvr global configuration command without keywords to enable the multicast VLAN registration (MVR) feature on the switch. Use the command with keywords to set the MVR mode for a switch, configure the MVR IP multicast address, set the maximum time to wait for a query reply before removing a port from group membership, and to specify the MVR multicast VLAN.
Page 292: Mvr (Global Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mvr (global configuration) Command Modes Global configuration Command History Release Modification 12.1(4)EA1 This command was introduced. Usage Guidelines A maximum of 256 MVR multicast groups can be configured on a switch. Use the mvr group command to statically set up all the IP multicast addresses that will take part in MVR.
Page 293 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mvr (global configuration) This example shows how to delete the previously configured ten IP multicast addresses: Switch(config)# no mvr group 228.1.23.1 10 This example shows how to delete all previously configured IP multicast addresses:...
Page 294: Mvr (Interface Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mvr (interface configuration) mvr (interface configuration) Use the mvr interface configuration command to configure a Layer 2 port as a multicast VLAN registration (MVR) receiver or source port, to set the Immediate Leave feature and to statically assign a port to an IP multicast VLAN and IP address.
Page 295: Mvr (Interface Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mvr (interface configuration) Receiver ports cannot be trunk ports. Receiver ports on a switch can be in different VLANs, but should not belong to the multicast VLAN. A port that is not taking part in MVR should not be configured as an MVR receiver port or a source port.
Page 296 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands mvr (interface configuration) To display the MVR status and whether or not immediate leave is enabled on an interface, use the show mvr privileged EXEC command for the interface, as in this example:...
Page 297: Pagp Learn-Method
Catalyst 1900 switch. When the link partner to the Catalyst 3550 switch is a physical learner, we recommend that you configure the switch as a physical-port learner by using the pagp learn-method physical-port interface configuration command and to set the load-distribution method based on the source MAC address by using the port-channel load-balance src-mac global configuration command.
Page 298 Displays PAgP channel-group information. show running-config Displays the current operating configuration. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands > Configuration File Management Commands.
Page 299: Pagp Port-Priority
Catalyst 1900 switch. When the link partner to the Catalyst 3550 switch is a physical learner, we recommend that you configure the switch as a physical-port learner by using the pagp learn-method physical-port interface configuration command and to set the load-distribution method based on the source MAC address by using the port-channel load-balance src-mac global configuration command.
Page 300 Displays PAgP channel-group information. show running-config Displays the current operating configuration. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands > Configuration File Management Commands.
Page 301: Permit
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands permit permit Use the permit MAC-access list configuration command to allow non-IP traffic to be forwarded if the conditions are matched. Use the no form of this command to remove a permit condition from the extended MAC access list.
Page 302: Permit
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands permit (Optional) Select EtherType DEC-LAT. lavc-sca (Optional) Select EtherType DEC-LAVC-SCA. lsap lsap-number mask (Optional) Use the LSAP number (0 to 65535) of a packet with IEEE 802.2 encapsulation to identify the protocol of the packet.
Page 303 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands permit If you use the host keyword, you cannot enter an address mask; if you do not use the any or host keywords, you must enter an address mask. After an access control entry (ACE) is added to an access control list, an implied deny-any-any condition exists at the end of the list.
Page 304: Permit (Arp Access-List Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands permit (ARP access-list configuration) permit (ARP access-list configuration) Use the permit Address Resolution Protocol (ARP) access-list configuration command to permit an ARP packet based on matches against the Dynamic Host Configuration Protocol (DHCP) bindings. Use the no form of this command to remove the specified access control entry (ACE) from the access control list.
Page 305: Permit (Arp Access-List Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands permit (ARP access-list configuration) Command History Release Modification 12.2(25)SEA This command was introduced. Usage Guidelines You can add permit clauses to forward ARP packets based on some matching criteria. Examples This example shows how to define an ARP access list and to permit both ARP requests and ARP responses from a host with an IP address of 1.1.1.1 and a MAC address of 0000.0000.abcd:...
Page 306: Police
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands police police Use the police policy-map class configuration command to define a policer for classified traffic. Use the no form of this command to remove an existing policer. police rate-bps burst-byte [exceed-action {drop | policed-dscp-transmit}]...
Page 307 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands police Examples This example shows how to configure a policer that drops packets if traffic exceeds a 1-Mbps average rate and a 20-KB burst. The DSCPs of incoming packets are trusted, and there is no packet modification.
Page 308: Police Aggregate
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands police aggregate police aggregate Use the police aggregate policy-map class configuration command to apply an aggregate policer to multiple classes in the same policy map. Use the no form of this command to remove the specified policer.
Page 309: Police Aggregate
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands police aggregate Switch(config-pmap)# class class3 Switch(config-pmap-c)# trust dscp Switch(config-pmap-c)# police aggregate agg_policer2 Switch(config-pmap-c)# exit You can verify your settings by entering the show mls qos aggregate-policer privileged EXEC command. Related Commands Command...
Page 310: Policy-Map
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands policy-map policy-map Use the policy-map global configuration command to create or modify a policy map that can be attached to multiple interfaces and to enter policy-map configuration mode. Use the no form of this command to delete an existing policy map and to return to global configuration mode.
Page 311 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands policy-map Only one policy map per interface per direction is supported. You can apply the same policy map to multiple interfaces and directions. Per-port per-VLAN policing is not supported on routed ports or on virtual (logical) interfaces. It is supported only on an ingress port configured as a trunk or as a static-access port.
Page 312 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands policy-map Switch(config)# interface gigabitethernet0/1 Switch(config-if)# service-policy input policymap2 This example shows how to delete policymap2: Switch(config)# no policy-map policymap2 You can verify your settings by entering the show policy-map privileged EXEC command.
Page 313: Port-Channel Load-Balance
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands port-channel load-balance port-channel load-balance Use the port-channel load-balance global configuration command to set the load-distribution method among the ports in the EtherChannel. Use the no form of this command to return to the default setting.
Page 314 Displays EtherChannel information for a channel. show running-config Displays the current operating configuration. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands >...
Page 315: Power Inline
Use the power inline interface configuration command to enable or disable the Power over Ethernet (PoE) ports on the Catalyst 3550-24PWR switch. Use the no form of this command to return to the default settings. power inline {auto | never} | [delay {shutdown seconds initial seconds}]...
Page 316: Power Inline
When the switch is connected to a Cisco powered device, the delay shutdown keywords are not needed. Although you can configure a delay shutdown time, it does not take any action on a connected Cisco device.
Page 317: Priority-Queue
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands priority-queue priority-queue Use the priority-queue interface configuration command to enable the egress expedite queue on a Gigabit-capable or a 10/100 Ethernet interface. Use the no form of this command to return to the default setting.
Page 318: Radius-Server Dead-Criteria
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands radius-server dead-criteria radius-server dead-criteria Use the radius-server dead-criteria global configuration command to configure the conditions that determine when a RADIUS server is considered unavailable or dead. Use the no form of this command to return to the default settings.
Page 319 Specifies the number of times that the switch tries to reach the RADIUS servers before considering the servers to be unavailable. For syntax information, select Cisco IOS Security Command Reference, Release 12.2 > Server Security Protocols > RADIUS Commands.
Page 320: Rcommand
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands rcommand rcommand Use the rcommand user EXEC command to start a Telnet session and to execute commands on a member switch from the command switch. To end the session, enter the exit command.
Page 321 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands rcommand Examples This example shows how to start a session with member 3. All subsequent commands are directed to member 3 until you enter the exit command or close the session. Switch# rcommand 3 Switch-3# show version Cisco Internet Operating System Software ...
Page 322: Remote-Span
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands remote-span remote-span Use the remote-span VLAN configuration command to add the Remote Switched Port Analyzer (RSPAN) feature to a VLAN. Use the no form of this command to remove the RSPAN feature from the VLAN.
Page 323: Rmon Collection Stats
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands rmon collection stats rmon collection stats Use the rmon collection stats interface configuration command to collect Ethernet group statistics, which include utilization statistics about broadcast and multicast packets, and error statistics about Cyclic Redundancy Check (CRC) alignment errors and collisions.
Page 324: Rmon Collection Stats
Related Commands Command Description show rmon statistics Displays RMON statistics. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > System Management Commands > RMON Commands.
Page 325: Sdm Prefer
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands sdm prefer sdm prefer Use the sdm prefer global configuration command to configure the template used in Switch Database Management (SDM) resource allocation. You use a template to allocate system memory to best support the features being used in your application.
Page 326: Sdm Prefer
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands sdm prefer Do not use the routing template if you do not have routing enabled on your switch. Entering the sdm prefer routing global configuration command prevents other features from using the memory allocated to unicast and multicast routing in the routing template (approximately 17 K for Fast Ethernet switches and 30 K for Gigabit Ethernet switches).
Page 327 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands sdm prefer Table 2-13 Approximate Number of Feature Resources Allowed by Each Template for Fast Ethernet Switches Resource Default Template Access Template Routing Template VLAN Template Unicast MAC addresses IGMP groups (managed by Layer 2...
Page 328: Service Password-Recovery
This command was introduced. Usage Guidelines This command is valid only on Catalyst 3550 Fast Ethernet switches; it is not available for Gigabit Ethernet switches. As a system administrator, you can use the no service password-recovery command to disable some of the functionality of the password recovery feature by allowing an end user to reset a password only by agreeing to return to the default configuration.
Page 329 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands service password-recovery If you use the no service password-recovery command to control end user access to passwords, we Note recommend that you save a copy of the config file in a location away from the switch in case the end user uses the password recovery procedure and sets the system back to default values.
Page 330 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands service password-recovery Related Commands Command Description show version Displays version information for the hardware and firmware. Catalyst 3550 Multilayer Switch Command Reference 2-304 OL-8566-01...
Page 331: Service-Policy
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands service-policy service-policy Use the service-policy interface configuration command to apply a policy map defined by the policy-map command to the input or output of a particular interface. Use the no form of this command to remove the policy map and interface association.
Page 332 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands service-policy Switch(config-if)# service-policy input plcmap1 This example shows how to apply plcmap2 to an egress interface: Switch(config)# interface gigabitethernet0/2 Switch(config-if)# service-policy output plcmap2 This example shows how to detach plcmap2 from an interface:...
Page 333: Set
{cos new-cos | dscp new-dscp | ip precedence new-precedence} no set {cos new-cos | dscp new-dscp | ip precedence new-precedence} Beginning with Cisco IOS Release 12.2(25)SE, the set dscp new-dscp command replaces the set ip dscp Note new-dscp command.
Page 334 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands The only match criterion in a policy map that can be attached to an egress interface is the match ip dscp dscp-list class-map configuration command. For the set dscp new-dscp or the set ip precedence new-precedence command, you can enter a mnemonic name for a commonly used value.
Page 335: Setup
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands setup setup Use the setup privileged EXEC command to configure the switch with its initial configuration. setup Syntax Description This command has no arguments or keywords. Command Modes Privileged EXEC Command History...
Page 336 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands setup Configuring global parameters: Enter host name [Switch]:host-name The enable secret is a password used to protect access to privileged EXEC and configuration modes. This password, after entered, becomes encrypted in the configuration.
Page 337 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands setup <output truncated> cluster enable cluster-name Use this configuration? [yes/no]: yes [0] Go to the IOS command prompt without saving this config. [1] Return back to the setup without saving this config.
Page 338: Setup Express
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands setup express setup express Use the setup express global configuration command to enable Express Setup mode on the switch. This is the default setting. Use the no form of this command to disable Express Setup mode.
Page 339: Setup Express
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands setup express You can verify that Express Setup mode is enabled by pressing the Mode button: On an unconfigured switch, the mode LEDs begin blinking green after 2 seconds. • On a configured switch, the mode LEDs turn solid green after a total of 10 seconds.
Page 340: Show Access-Lists
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show access-lists show access-lists Use the show access-lists privileged EXEC command to display access control lists (ACLs) configured on the switch. show access-lists [name | number | hardware counters] [ | {begin | exclude | include} expression]...
Page 341 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show access-lists 10 permit host 1100.bb00.00cc host 2234.0123.2345 This is an example of output from the show access-lists hardware counters command: Switch# show access-lists hardware counters Input Drops: 0 matches (0 bytes)
Page 342: Show Archive Status
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show archive status show archive status Use the show archive status privileged EXEC command to display the status of a new image being downloaded to a switch with the HTTP or TFTP protocol.
Page 343: Show Auto Qos
[interface-id] [buffers | queueing] show running-config • Examples This is an example of output from the show auto qos command after the auto qos voip cisco-phone and the auto qos voip cisco-softphone interface configuration commands are entered: Switch> show auto qos FastEthernet0/1...
Page 344: Show Auto Qos
This is an example of output from the show running-config privileged EXEC command when the auto qos voip cisco-phone and the auto qos voip cisco-softphone interface configuration commands are entered on 10/100 Ethernet interfaces: Switch# show running-config Building configuration...
Page 345 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show auto qos wrr-queue min-reserve 1 5 wrr-queue min-reserve 2 6 wrr-queue min-reserve 3 7 wrr-queue min-reserve 4 8 wrr-queue cos-map 1 0 1 wrr-queue cos-map 2 2 4 wrr-queue cos-map 3 3 6 7...
Page 346: Show Boot
Output appear. Note Only the Cisco IOS software can read and write a copy of the private configuration file. You cannot read, write, delete, or display a copy of this file. Examples This is an example of output from the show boot command.
Page 347 NVRAM/Config file buffer size Displays the buffer size that Cisco IOS uses to hold a copy of the configuration file in memory. The configuration file cannot be larger than the buffer size allocation.
Page 348: Show Class-Map
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show class-map show class-map Use the show class-map user EXEC command to display quality of service (QoS) class maps, which define the match criteria to classify traffic. show class-map [class-map-name] [ | {begin | exclude | include} expression]...
Page 349: Show Cluster
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show cluster show cluster Use the show cluster user EXEC command to display the cluster status and a summary of the cluster to which the switch belongs. This command can be entered on command and member switches.
Page 350 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show cluster This is an example of output when the show cluster command is entered on a member switch: Switch1> show cluster Member switch for cluster "hapuna" Member number: Management IP address: 192.192.192.192...
Page 351: Show Cluster Candidates
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show cluster candidates show cluster candidates Use the show cluster candidates privileged EXEC command on the command switch to display a list of candidate switches. show cluster candidates [detail | mac-address H.H.H.] [ | {begin | exclude | include} expression]...
Page 352 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show cluster candidates Device type: cisco WS-C3512-XL Upstream MAC address: 00d0.796d.2f00 (Cluster Member 0) Local port: Fa0/3 FEC number: Upstream port: Fa0/13 FEC Number: Hops from cluster edge: 1 Hops from command device: 1...
Page 353: Show Cluster Members
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show cluster members show cluster members Use the show cluster members privileged EXEC command on the command switch to display information about the cluster members. show cluster members [n | detail] [ | {begin | exclude | include} expression] Syntax Description (Optional) Number that identifies a cluster member.
Page 354 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show cluster members This is an example of output from the show cluster members detail command: Switch# show cluster members detail Device 'StLouis1' with member number 0 (Command Switch) Device type: cisco WS-C3550-12T MAC address: 0002.4b29.2e00...
Page 355: Show Controllers Cpu-Interface
12.1(4)EA1 This command was introduced. Usage Guidelines This display provides information that might be useful for Cisco technical support representatives troubleshooting the switch. Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Page 356 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show controllers cpu-interface SCInstance fields:fs_notify_failed = 0, no_fsd_space = 0 invalid_frames = 0, unexpected_valid_frames = 0 too_large_frames = 0 Aged frames from notify queues and unexpected retrieves: aged_frames[0] = 0, unexpected_retrieves[0] = 0...
Page 357: Show Controllers Ethernet-Controller
Usage Guidelines This display without keywords provides traffic statistics, basically the RMON statistics for the interface. When you enter the asic or phy keyword, the displayed information is useful primarily for Cisco technical support representatives troubleshooting the switch. Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Page 358 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show controllers ethernet-controller 3 collision frames 0 Oversize frames 4 collision frames 0 Undersize frames 5 collision frames 0 Collision fragments 6 collision frames 7 collision frames 220108 Minimum size frames 8 collision frames...
Page 359 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show controllers ethernet-controller Table 2-15 Transmit Field Descriptions (continued) Field Description 13 collision frames The number of frames that are successfully sent on an interface after 13 collisions occur. 14 collision frames The number of frames that are successfully sent on an interface after 14 collisions occur.
Page 360 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show controllers ethernet-controller Table 2-16 Receive Field Descriptions (continued) Field Description FCS errors The total number of frames received on an interface that have a valid length (in bytes) but do not have the correct FCS values.
Page 361 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show controllers ethernet-controller Command Description show controllers Displays the state of the CPU network ASIC and send and receive statistics cpu-interface for packets reaching the CPU. show interfaces Displays the administrative and operational status of all interfaces or a specified interface.
Page 362: Show Controllers Switch
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show controllers switch show controllers switch Use the show controllers switch privileged user command to display the settings of the resource-allocation priority or the wirespeed-store feature. show controllers switch {resource-allocation priority | wirespeed-store} [ | {begin | exclude |...
Page 363: Show Controllers Tcam
12.1(4)EA1 This command was introduced. Usage Guidelines This display provides information that might be useful for Cisco technical support representatives troubleshooting the switch. Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Page 364: Show Controllers Tcam
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show controllers tcam Global Mask[13]: FF FFFFFFFF FFFFFFFF Global Mask[14]: FF FFFFFFFF FFFFFFFF Global Mask[15]: FF FFFFFFFF FFFFFFFF Global Mask[16]: FF FFFFFFFF FFFFFFFF Global Mask[20]: FF FFFFFFFF FFFFFFFF Global Mask[21]: FF FFFFFFFF FFFFFFFF...
Page 365: Show Controllers Utilization
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show controllers utilization show controllers utilization Use the show controllers utilization user EXEC command to display bandwidth utilization on the switch or specific ports. show controllers [interface-id] utilization [ | {begin | exclude | include} expression]...
Page 366: Show Controllers Utilization
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show controllers utilization Table 2-17 show controllers utilization Field Descriptions Field Description Receive Bandwidth Percentage Displays the received bandwidth usage of the switch, which is the Utilization sum of the received traffic on all the ports divided by the switch receive capacity.
Page 367: Show Dot1Q-Tunnel
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show dot1q-tunnel show dot1q-tunnel Use the show dot1q-tunnel user EXEC command to display information about IEEE 802.1Q tunnel ports. show dot1q-tunnel [interface interface-id] [ | {begin | exclude | include} expression] Syntax Description interface interface-id (Optional) Specify the interface for which to display IEEE 802.1Q tunneling...
Page 368: Show Dot1X
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show dot1x show dot1x Use the show dot1x user EXEC command to display IEEE 802.1x statistics, administrative status, and operational status for the switch or for the specified interface. show dot1x [{all [summary] | interface interface-id} [details | statistics]] [ | {begin | exclude |...
Page 369 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show dot1x Examples This is an example of output from the show dot1x user EXEC command: Switch> show dot1x Sysauthcontrol Enabled Dot1x Protocol Version Critical Recovery Delay Critical EAPOL Disabled This is an example of output from the show dot1x all user EXEC command: Switch>...
Page 370 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show dot1x ----------------------------------- = AUTHENTICATOR PortControl = AUTO ControlDirection = Both HostMode = SINGLE_HOST ReAuthentication = Disabled QuietPeriod = 60 ServerTimeout = 30 SuppTimeout = 30 ReAuthPeriod = 3600 (Locally configured) ReAuthMax...
Page 371 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show dot1x Table 2-18 show dot1x statistics Field Descriptions Field Description RxStart Number of valid EAPOL-start frames that have been received. RxLogoff Number of EAPOL-logoff frames that have been received. RxResp Number of valid EAP-response frames (other than response/identity frames) that have been received.
Page 372: Show Env
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show env show env Use the show env user EXEC command to display fan, temperature, and power information for the switch. show env {all | fan | power | rps | temperature} [ | {begin | exclude | include} expression] Syntax Description Display both fan and temperature environmental status.
Page 373: Show Errdisable Detect
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show errdisable detect show errdisable detect show errdisable detect [ | {begin | exclude | include} expression] Syntax Description | begin (Optional) Display begins with the line that matches the expression. | exclude (Optional) Display excludes lines that match the expression.
Page 374 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show errdisable detect Related Commands Command Description errdisable detect cause Enables error-disable detection for a specific cause or all causes. show errdisable flap-values Displays error condition recognition information. show errdisable recovery Displays error-disable recovery timer information.
Page 375: Show Errdisable Flap-Values
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show errdisable flap-values show errdisable flap-values Use the show errdisable flap-values user EXEC command to display conditions that cause an error to be recognized for a cause. show errdisable flap-values [ | {begin | exclude | include} expression]...
Page 376 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show errdisable flap-values Command Description show errdisable recovery Displays error-disable recovery timer information. show interfaces status Displays interface status or a list of interfaces in error-disabled state. Catalyst 3550 Multilayer Switch Command Reference...
Page 377: Show Errdisable Recovery
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show errdisable recovery show errdisable recovery Use the show errdisable recovery user EXEC command to display the error-disable recovery timer information. show errdisable recovery [ | {begin | exclude | include} expression]...
Page 378: Show Errdisable Recovery
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show errdisable recovery Though visible in the output, the unicast-flood field is not valid. Note Related Commands Command Description errdisable recovery Configures the recover mechanism variables. show errdisable detect Displays error disable detection status.
Page 379: Show Etherchannel
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show etherchannel show etherchannel Use the show etherchannel user EXEC command to display EtherChannel information for a channel. show etherchannel [channel-group-number] {detail | load-balance | port | port-channel | summary | protocol} [ | {begin | exclude | include} expression]...
Page 380: Show Etherchannel
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show etherchannel ------------ Port state = Up Mstr In-Bndl Channel group = 1 Mode = Desirable-Sl Gcchange = 0 Port-channel = Po1 = 0x00010001 Pseudo port-channel = Po1 Port index Load = 0x00 Flags: S - Device is sending Slow hello.
Page 381 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show etherchannel ------+------+------+------------ Gi0/1 desirable-sl Gi0/2 desirable-sl Time since last port bundled: 00d:00h:07m:56s Gi0/1 This is an example of output from the show etherchannel 1 protocol command: Switch# show etherchannel 1 protocol...
Page 382: Show Fallback Profile
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show fallback profile show fallback profile Use the show fallback profile privileged EXEC command to display the fallback profiles that are configured on a switch. show fallback profile [append | begin | exclude | include | {[redirect | tee] url} expression]...
Page 383: Show Fallback Profile
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show fallback profile Related Commands Command Description dot1x fallback Configure a port to use web authentication as a fallback method for clients that do not support IEEE 802.1x authentication. fallback profile Create a web authentication fallback profile.
Page 384: Show Flowcontrol
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show flowcontrol show flowcontrol Use the show flowcontrol user EXEC command to display the flow control status and statistics. show flowcontrol [interface interface-id | module module-number] [ | {begin | exclude | include}...
Page 385: Show Flowcontrol
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show flowcontrol admin oper admin oper --------- -------- -------- -------- -------- ------- ------- Gi0/2 desired Related Commands Command Description flowcontrol Sets the receive flow-control state for an interface. Catalyst 3550 Multilayer Switch Command Reference...
Page 386: Show Fm
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show fm show fm Use the show fm privileged EXEC command to display feature-manager information for a specified port label or VLAN label to list features associated with that label, including if any features were not able to fit in the hardware or if configuration conflicts have occurred.
Page 387 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show fm Switch# show fm port-label 2 Conflicts exist with layer 3 access groups. Needed in CAM(s):1 Loaded into CAM(s):1 Sent to CPU by CAM(s): Interfaces: Gi0/1 IP Access Group:ip3 0 VMRs DHCP Broadcast Suppression Disabled.
Page 388 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show fm This is an example of output from the show fm vlan-label command when there was not enough room for the input access group or the output access group on the label. Note that the access groups were configured on two different interfaces.
Page 389: Show Fm Interface
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show fm interface show fm interface Use the show fm interface privileged EXEC command to display per-interface feature-manager information. Use it with the show fm port-label privileged EXEC command to get information about features applied to the interface.
Page 390: Show Fm Interface
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show fm interface Related Commands Command Description show fm Displays feature-manager information for a specified label and lists configuration conflicts or features associated with that label that were not able to fit into the hardware.
Page 391: Show Fm Vlan
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show fm vlan show fm vlan Use the show fm vlan privileged EXEC command to display per-VLAN feature-manager information. Use with the show fm vlan-label privileged EXEC command to get information about features applied to the VLAN.
Page 392: Show Forward
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show forward show forward Use the show forward privileged EXEC command for an interface to determine how the hardware would forward a frame that matches the specified parameters. show forward interface-id [vlan vlan-id] src-mac dst-mac [ex-class] [ex-l4op] [ex-qos] [ex-sig]...
Page 393 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show forward option (Optional) Keyword signifying IP options are present in the packet. icmp icmp-type icmp-code Internet Control Message Protocol (ICMP) parameters. The icmp-type and icmp-code ranges are 0 to 255. igmp igmp-version igmp-type Internet Group Management Protocol (IGMP) parameters. The igmp-version and igmp-type ranges are 0 to 255.
Page 394 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show forward If ACLs are present, all keywords in the command could be important to the forwarding decision. Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Page 395 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show forward bridgeDestMap: 00000000 00000000 0000FFFF FFFFFFC7 vlanMask: 00000000 00000000 0000FFFF FFFFFE7F portMask: 00000000 00000000 00000000 00000080 sourceMask: 00000000 00000000 00000000 00000000 globalMap: 00000000 00000000 00000000 00000000 globalMask: 00000000 00000000 0002FFFF EFFFFC03...
Page 396 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show forward Table 2-19 show forward Output Description (continued) Output Section Description frame notifies section Contains the bitmap that results from combining the maps and masks from the bitmaps section. If SPAN is configured, there might be additional bitmaps displayed.
Page 397: Show Interfaces
(Optional) Display the input and output packets by switching path for the interface. status (Optional) Display the status of the interface. A status of unsupported in the Type field means that a non-Cisco small form-factor pluggable (SFP) module is inserted in the module slot. err-disabled (Optional) Display interfaces in error-disabled state.
Page 398 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show interfaces trunk Display interface trunk information. If you do not specify an interface, only information for active trunking ports appears. | begin (Optional) Display begins with the line that matches the expression.
Page 399 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show interfaces Encapsulation ARPA, loopback not set Keepalive set (10 sec) Half-duplex, 100Mb/s input flow-control is off, output flow-control is off ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:00, output 00:00:08, output hang never Last clearing of "show interface"...
Page 400: Configuration Command
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show interfaces This is an example of output from the show interfaces gigabitethernet0/4 description command when the interface has been described as Connects to Marketing by using the description interface configuration command:...
Page 401 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show interfaces = 0x00000000 HotStandBy port = null Port state = Port-channel Ag-Not-Inuse ---- Port-channel10: Age of the Port-channel = 01d:06h:06m:15s Logical slot/port = 1/0 Number of ports = 0 = 0x00000000...
Page 402 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show interfaces Port Vlans pruned for lack of request by neighbor Gi0/1 Port Vlans traffic requested of neighbor Gi0/1 This is an example of output from the show interfaces stats command for a specified interface:...
Page 403 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show interfaces Voice VLAN: none (Inactive) Appliance trust: none Table 2-21 show interfaces switchport Field Descriptions Field Description Name Displays the port name. Switchport Displays the administrative and operational status of the port.
Page 404 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show interfaces Name : Fa0/1 Administrative Speed: auto 10 100 Administrative Duplex: auto Administrative Auto-MDIX: N/A Administrative Power Inline: enable Operational Speed: 100 Operational Duplex: full Operational Auto-MDIX: N/A Name : Fa0/2...
Page 405: Show Interfaces Counters
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show interfaces counters show interfaces counters Use the show interfaces counters privileged EXEC command to display various counters for the switch or for a specific interface. show interfaces [interface-id] counters [errors | etherchannel | protocol status | trunk] [ | {begin...
Page 406: Show Interfaces Counters
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show interfaces counters Gi0/1 4990607 28079 21122 Gi0/2 1621568 25337 Switch# show interfaces counters errors Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize Gi0/1 Gi0/2 Gi0/3 Gi0/4 Port Single-Col Multi-Col Late-Col Excess-Col Carri-Sen Runts...
Page 407: Show Inventory
Examples This is an example of output from the show inventory command: Switch# show inventory NAME: “sw-1-3-f48”, DESCR: “Cisco Catalyst 3550 48 10/100 baseT ports + 2 Gig uplinks fixed configuration Layer 2/3 Ethernet Switch” PID: WS-C3550-48 , VID: C0 , SN: CHK0614V09S...
Page 408: Show Arp Access-List
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show arp access-list show arp access-list Use the show arp access-list user EXEC command to display detailed information about Address Resolution Protocol (ARP) access control lists (ACLs). show arp access-list [acl-name] [ | {begin | exclude | include} expression] This command is available only if your switch is running the IP services image, formerly known as the enhanced multilayer image (EMI).
Page 409: Show Ip Arp Inspection
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip arp inspection show ip arp inspection Use the show ip arp inspection privileged EXEC command to display the configuration and the operating state of dynamic Address Resolution Protocol (ARP) inspection or the status of this feature for all VLANs or for the specified interface or VLAN.
Page 410: Show Ip Arp Inspection
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip arp inspection Examples This is an example of output from the show ip arp inspection interfaces command: Switch# show ip arp inspection interfaces Interface Trust State Rate (pps) Burst Interval...
Page 411 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip arp inspection For the show ip arp inspection statistics command, the switch increments the number of forwarded packets for each ARP request and response packet on a trusted dynamic ARP inspection port. The switch...
Page 412: Show Ip Dhcp Snooping
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip dhcp snooping show ip dhcp snooping Use the show ip dhcp snooping user EXEC command to display the DHCP snooping configuration. show ip dhcp snooping Syntax Description This command has no arguments or keywords.
Page 413: Show Ip Dhcp Snooping Binding
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip dhcp snooping binding show ip dhcp snooping binding Use the show ip dhcp snooping binding user EXEC command to display the DHCP snooping binding table and configuration information for all interfaces on a switch.
Page 414: Show Ip Dhcp Snooping Binding
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip dhcp snooping binding This example shows how to display the DHCP snooping binding entries for a specific MAC address: Switch> show ip dhcp snooping binding 0102.0304.0506 MacAddress IpAddress Lease(sec) Type...
Page 415: Show Ip Dhcp Snooping Database
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip dhcp snooping database show ip dhcp snooping database Use the show ip dhcp snooping database user EXEC command to display the status of the DHCP snooping binding database agent. show ip dhcp snooping database [detail] [ | {begin | exclude | include} expression] This command is available only if your switch is running the IP services image, formerly known as the enhanced multilayer image (EMI).
Page 416: Show Ip Dhcp Snooping Statistics
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip dhcp snooping database Delay Timer Expiry : 7 (00:00:07) Abort Timer Expiry : Not Running Last Succeded Time : None Last Failed Time : 17:14:25 UTC Sat Jul 7 2001 Last Failed Reason : Unable to access URL.
Page 417: Show Ip Dhcp Snooping Statistics
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip dhcp snooping statistics show ip dhcp snooping statistics Use the show ip dhcp snooping statistics user EXEC command to display DHCP snooping statistics in summary or detail form. show ip dhcp snooping statistics [detail] [ | {begin | exclude | include} expression]...
Page 418 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip dhcp snooping statistics Table 2-23 shows the DHCP snooping statistics and their descriptions: Table 2-23 DHCP Snooping Statistics DHCP Snooping Statistic Description Packets Processed by DHCP Snooping Total number of packets handled by DHCP snooping, including forwarded and dropped packets.
Page 419 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip dhcp snooping statistics Table 2-23 DHCP Snooping Statistics DHCP Snooping Statistic Description Insertion of opt82 fail Number of times the option-82 insertion into a packet failed. The insertion might fail if the packet with the option-82 data exceeds the size of a single physical packet on the internet.
Page 420: Show Ip Igmp Profile
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip igmp profile show ip igmp profile Use the show ip igmp profile privileged EXEC command to view all configured Internet Group Management Protocol (IGMP) profiles or a specified IGMP profile.
Page 421: Show Ip Igmp Snooping
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip igmp snooping show ip igmp snooping Use the show ip igmp snooping user EXEC command to display the Internet Group Management Protocol (IGMP) snooping configuration of the switch or the VLAN.
Page 422 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip igmp snooping Last member query interval : 100 Vlan 1: -------- IGMP snooping :Enabled Immediate leave :Disabled Multicast router learning mode :pim-dvmrp Source only learning age timer CGMP interoperability mode...
Page 423 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip igmp snooping Related Commands Command Description ip igmp snooping Enables IGMP snooping on the switch or on a VLAN. ip igmp snooping Enables the IGMP snooping configurable-leave timer. last-member-query-interval ip igmp snooping querier Enables the IGMP querier function in Layer 2 networks.
Page 424: Show Ip Igmp Snooping Groups
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip igmp snooping groups show ip igmp snooping groups Use the show ip igmp snooping groups privileged EXEC command to display the Internet Group Management Protocol (IGMP) snooping multicast table for the switch or the multicast information. Use with the vlan keyword to display the multicast table for a specified multicast VLAN or specific multicast information.
Page 425: Show Ip Igmp Snooping Groups
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip igmp snooping groups Examples This is an example of output from the show ip igmp snooping groups command without any keywords. It displays the multicast table for the switch. Switch# show ip igmp snooping groups...
Page 426: Show Ip Igmp Snooping Mrouter
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip igmp snooping mrouter show ip igmp snooping mrouter Use the show ip igmp snooping mrouter privileged EXEC command to display the Internet Group Management Protocol (IGMP) snooping dynamically learned and manually configured multicast router ports for the switch or for the specified multicast VLAN.
Page 427 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip igmp snooping mrouter Related Commands Command Description ip igmp snooping Enables IGMP snooping on the switch or on a VLAN. ip igmp snooping vlan mrouter Adds a multicast router port.
Page 428: Show Ip Igmp Snooping Querier
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip igmp snooping querier show ip igmp snooping querier Use the show ip igmp snooping querier detail user EXEC command to display the configuration and operation information for the IGMP querier configured on a switch.
Page 429 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip igmp snooping querier Examples This is an example of output from the show ip igmp snooping querier command: Switch> show ip igmp snooping querier Vlan IP Address IGMP Version Port --------------------------------------------------- 172.20.50.11...
Page 430: Show Ip Source Binding
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip source binding show ip source binding Use the show ip source binding user EXEC command to display the IP source bindings on the switch. show ip source binding [ip-address] [mac-address] [dhcp-snooping | static] [interface...
Page 431: Show Ip Verify Source
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip verify source show ip verify source Use the show ip verify source user EXEC command to display the IP source guard configuration on the switch or on a specific interface.
Page 432: Show Ip Verify Source
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show ip verify source On the Fast Ethernet 0/5 interface, IP source guard with source IP and MAC address filtering is • enabled and configured with a static IP binding, but port security is disabled. The switch cannot filter source MAC addresses.
Page 433: Show L2Protocol-Tunnel
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show l2protocol-tunnel show l2protocol-tunnel Use the show l2protocol-tunnel user EXEC command to display information about Layer 2 protocol tunnel ports. Displays information for interfaces with protocol tunneling enabled. show l2protocol-tunnel [interface interface-id] [summary] [ | {begin | exclude | include}...
Page 434 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show l2protocol-tunnel Fa0/10 ---- ---- ---- ---- ---- ---- ---- 9847 1866 ---- ---- 77 pagp ---- ---- 859 lacp ---- ---- 0 udld ---- ---- 219 Fa0/11 1100 ---- 2356 2350...
Page 435 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show l2protocol-tunnel Catalyst 3550 Multilayer Switch Command Reference 2-409 OL-8566-01...
Page 436: Show L2Tcam
{cam {forwarding [entry-id] learning} | shadow} [ | {begin | exclude | include} expression] Syntax Description Display contents and associated information about TCAM Layer 2 contents. This display output is a raw hex dump of information, intended for a Cisco technical support representative. forwarding Display TCAM Layer 2 forwarding (bridging) information.
Page 437 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show l2tcam 9252 00 00000000 00000000 80060000 9253 00 00000000 00000000 80010000 9254 00 00000000 00000000 80030000 9255 18 00010002 4B296700 80040000 <output truncated> 9368 FF FFFFFFFF FFFFFFFF 5E731478 9369 FF FFFFFFFF FFFFFFFF...
Page 438: Show L3Tcam
12.1(4)EA1 This command was introduced. Usage Guidelines This display provides information that might be useful for Cisco technical support representatives troubleshooting the switch. Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Page 439 References > Cisco IOS Switching Services Command Reference, Release 12.2. show arp Displays the entries in the ARP table. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS IP Command Reference, Volume 1 of 3: Addressing and Services, Release 12.2.
Page 440: Show Lacp
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show lacp show lacp Use the show lacp user EXEC command to display Link Aggregation Control Protocol (LACP) channel-group information. show lacp {channel-group-number {counters | internal | neighbor} | {counters | internal |...
Page 441 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show lacp Channel group 1 LACP port Admin Oper Port Port Port Flags State Priority Number State Fa0/5 indep 32768 0x7C Fa0/6 indep 32768 0x7C Fa0/7 down 32768 This is an example of output from the show lacp neighbor command: Switch>...
Page 442: Show Mac Access-Group
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mac access-group show mac access-group Use the show mac access-group user EXEC command to display the MAC access control lists (ACLs) configured for an interface or a switch. show mac access-group [interface interface-id] [ | {begin | exclude | include} expression]...
Page 443 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mac access-group This is an example of output from the show mac access-group interface gigabitethernet0/2 command: Switch# show mac access-group interface gigabitethernet0/2 Interface GigabitEthernet0/2: Inbound access-list is macl_e1 Related Commands Command...
Page 444: Show Mac Address-Table
[ | {begin | exclude | include} expression] Note Beginning with Cisco IOS Release 12.1(11)EA1, the show mac address-table command replaces the show mac-address-table command (with the hyphen). Syntax Description | begin (Optional) Display begins with the line that matches the expression.
Page 445 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mac address-table Related Commands Command Description clear mac address-table dynamic Deletes from the MAC address table a specific dynamic address, all dynamic addresses on a particular interface, or all dynamic addresses on a particular VLAN.
Page 446: Show Mac Address-Table Address
MAC address. show mac address-table address mac-address [interface interface-id] [vlan vlan-id] [ | {begin | exclude | include} expression] Beginning with Cisco IOS Release 12.1(11)EA1, the show mac address-table address command Note replaces the show mac-address-table address command (with the hyphen).
Page 447 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mac address-table address Related Commands Command Description show mac address-table aging-time Displays the aging time in all VLANs or the specified VLAN. show mac address-table count Displays the number of addresses present in all VLANs or the specified VLAN.
Page 448: Show Mac Address-Table Aging-Time
VLANs or the specified VLAN. show mac address-table aging-time [vlan vlan-id] [ | {begin | exclude | include} expression] Note Beginning with Cisco IOS Release 12.1(11)EA1, the show mac address-table aging-time command replaces the show mac-address-table aging-time command (with the hyphen). Syntax Description vlan vlan-id (Optional) Display aging time information for a specific VLAN.
Page 449 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mac address-table aging-time Related Commands Command Description mac address-table aging-time Sets the length of time that a dynamic entry remains in the MAC address table after the entry is used or updated.
Page 450: Show Mac Address-Table Count
VLANs or the specified VLAN. show mac address-table count [vlan vlan-id] [ | {begin | exclude | include} expression] Note Beginning with Cisco IOS Release 12.1(11)EA1, the show mac address-table count command replaces the show mac-address-table count command (with the hyphen). Syntax Description vlan vlan-id (Optional) Display the number of addresses for a specific VLAN.
Page 451 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mac address-table count Related Commands Command Description show mac address-table address Displays MAC address table information for the specified MAC address. show mac address-table aging-time Displays the aging time in all VLANs or the specified VLAN.
Page 452: Show Mac Address-Table Dynamic
[address mac-address] [interface interface-id] [vlan vlan-id] [ | {begin | exclude | include} expression] Beginning with Cisco IOS Release 12.1(11)EA1, the show mac address-table dynamic command Note replaces the show mac-address-table dynamic command (with the hyphen).
Page 453 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mac address-table dynamic Related Commands Command Description clear mac address-table dynamic Deletes from the MAC address table a specific dynamic address, all dynamic addresses on a particular interface, or all dynamic addresses on a particular VLAN.
Page 454: Show Mac Address-Table Interface
VLAN. show mac address-table interface interface-id [vlan vlan-id] [ | {begin | exclude | include} expression] Beginning with Cisco IOS Release 12.1(11)EA1, the show mac address-table interface command Note replaces the show mac-address-table interface command (with the hyphen).
Page 455 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mac address-table interface Related Commands Command Description show mac address-table address Displays MAC address table information for the specified MAC address. show mac address-table aging-time Displays the aging time in all VLANs or the specified VLAN.
Page 456: Show Mac Address-Table Multicast
The show mac address-table multicast command only shows non-IP multicast addresses. Use the show Note ip igmp snooping multicast user EXEC command to display IP multicast addresses. Beginning with Cisco IOS Release 12.1(11)EA1, the show mac address-table multicast command Note replaces the show mac-address-table multicast command (with the hyphen).
Page 457 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mac address-table multicast Vlan Mac Address Type Ports ---- ----------- ---- ----- 0100.5e00.0128 IGMP Gi0/1 This is an example of output from the show mac address-table multicast count command. It shows how to display a total count of MAC address entries for the switch.
Page 458: Show Mac Address-Table Notification
[interface [interface-id] [ | {begin | exclude | include} expression] Beginning with Cisco IOS Release 12.1(11)EA1, the show mac address-table notification command Note replaces the show mac-address-table notification command (with the hyphen).
Page 459 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mac address-table notification Number of Notifications sent to NMS : 3 Maximum Number of entries configured in History Table : 100 Current History Table Length : 3 MAC Notification Traps are Enabled...
Page 460: Show Mac Address-Table Static
[[address mac-address [interface interface-id | vlan vlan-id]] | [interface interface-id [vlan vlan-id]] | vlan vlan-id] [ | {begin | exclude | include} expression] Beginning with Cisco IOS Release 12.1(11)EA1, the show mac address-table static command replaces Note the show mac-address-table static command (with the hyphen).
Page 461 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mac address-table static 0180.c200.0003 STATIC 0180.c200.0004 STATIC 0180.c200.0005 STATIC 0001.0002.0004 STATIC Drop 0001.0002.0007 STATIC Drop Total Mac Addresses for this criterion: 10 Related Commands Command Description mac address-table static Adds static addresses to the MAC address table.
Page 462: Show Mac Address-Table Vlan
VLAN. show mac address-table vlan vlan-id [ | {begin | exclude | include} expression] Note Beginning with Cisco IOS Release 12.1(11)EA1, the show mac address-table vlan command replaces the show mac-address-table vlan command (with the hyphen). Syntax Description vlan-id (Optional) Display addresses for a specific VLAN.
Page 463 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mac address-table vlan Related Commands Command Description show mac address-table address Displays MAC address table information for the specified MAC address. show mac address-table aging-time Displays the aging time in all VLANs or the specified VLAN.
Page 464: Show Mls Qos
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mls qos show mls qos Use the show mls qos user EXEC command to display global quality of service (QoS) configuration information. show mls qos [ | {begin | exclude | include} expression]...
Page 465: Show Mls Qos Aggregate-Policer
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mls qos aggregate-policer show mls qos aggregate-policer Use the show mls qos aggregate-policer user EXEC command to display the quality of service (QoS) aggregate policer configuration. A policer defines a maximum permissible rate of transmission, a maximum burst size for transmissions, and an action to take if either maximum is exceeded.
Page 466: Show Mls Qos Interface
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mls qos interface show mls qos interface Use the show mls qos interface user EXEC command to display quality of service (QoS) information at the interface level. show mls qos interface [interface-id] [buffers | policers | queueing | statistics]...
Page 467: Show Mls Qos Interface
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mls qos interface trust state: not trusted trust mode: trust cos COS override: dis default COS: 0 DSCP Mutation Map: Default DSCP Mutation Map trust device: cisco-phone This is an example of output from the show mls qos interface gigabitethernet0/1 buffers command: Switch>...
Page 468 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mls qos interface cos-qid 0 - 1 1 - 1 2 - 2 3 - 2 4 - 3 5 - 3 6 - 4 7 - 4 In the preceding display, the egress expedite queue is enabled. Because of this, the weight of the expedite queue (queue 4) is ignored and not used in the ratio calculation.
Page 469 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mls qos interface Table 2-24 show mls qos interface statistics Field Descriptions Field Description Ingress incoming Number of packets or bytes with a specific DSCP entering the ingress QoS process. no_change Number of packets or bytes for which the DSCP value did not change after classification.
Page 470: Show Mls Qos Maps
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mls qos maps show mls qos maps Use the show mls qos maps user EXEC command to display quality of service (QoS) mapping information. Maps are used to generate an internal Differentiated Services Code Point (DSCP) value, which represents the priority of the traffic.
Page 471 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mls qos maps --------------------------------------- 00 00 00 00 00 00 00 00 01 01 01 01 01 01 01 01 02 02 02 02 02 02 02 02 03 03 03 03 03 03...
Page 472: Show Monitor
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show monitor show monitor Use the show monitor user EXEC command to display Switched Port Analyzer (SPAN) and Remote SPAN (RSPAN) session information. show monitor [session {session_number | all | local | range | remote}] [ | {begin | exclude | include}...
Page 473: Show Monitor
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show monitor Destination Ports: None Encapsulation: DOT1Q Ingress:Enabled, default VLAN=5 Reflector Ports: None Filter VLANs: None Dest RSPAN VLAN: None Related Commands Command Description monitor session Starts a new SPAN or RSPAN session, adds or deletes interfaces or VLANs to or from an existing SPAN or RSPAN session, and filters SPAN source traffic to specific source VLANs.
Page 474: Show Mvr
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mvr show mvr Use the show mvr privileged EXEC command without keywords to display the current Multicast VLAN Registration (MVR) global parameter values, including whether or not MVR is enabled, the MVR multicast VLAN, the maximum query response time, the number of multicast groups, and the MVR mode (dynamic or compatible).
Page 475 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mvr Command Description show mvr interface Displays the configured MVR interfaces, status of the specified interface, or all multicast groups to which the interface belongs when the interface and members keywords are appended to the command.
Page 476: Show Mvr Interface
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mvr interface show mvr interface Use the show mvr interface privileged EXEC command without keywords to display the Multicast VLAN Registration (MVR) receiver and source ports. Use the command with keywords to display MVR parameters for a specific receiver port.
Page 477: Show Mvr Interface
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mvr interface Inactive means that the port is not yet part of any VLAN. • This is an example of output from the show mvr interface gigabitethernet0/2 command: Switch# show mvr interface gigabitethernet0/2...
Page 478: Show Mvr Members
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mvr members show mvr members Use the show mvr members privileged EXEC command to display all receiver and source ports that are currently members of an IP multicast group. show mvr members [ip-address] [ | {begin | exclude | include} expression]...
Page 479: Show Mvr Members
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show mvr members This is an example of output from the show mvr members 239.255.0.2 command. It shows how to view the members of the IP multicast group 239.255.0.2: Switch# show mvr members 239.255.0.2 239.255.0.2...
Page 480: Show Pagp
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show pagp show pagp Use the show pagp user EXEC command to display Port Aggregation Protocol (PAgP) channel-group information. show pagp [channel-group-number] {counters | internal | neighbor} [ | {begin | exclude |...
Page 481: Show Pagp
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show pagp Channel group 1 Hello Partner PAgP Learning Group Port Flags State Timers Interval Count Priority Method Ifindex Gi0/1 U6/S7 Gi0/2 U6/S7 This is an example of output from the show pagp 1 neighbor command: Switch>...
Page 482: Show Parser Macro
Output appear. Examples This is a partial output example from the show parser macro command. The output for the Cisco-default macros varies depending on the switch platform and the software image running on the switch: Switch# show parser macro...
Page 483 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show parser macro # Basic interface - Enable data VLAN only # Recommended value for access vlan (AVID) should not be 1 switchport access vlan $AVID switchport mode access <output truncated> --------------------------------------------------------------...
Page 484 Creates a macro. show running-config Displays the current operating configuration, including defined macros. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands > Configuration File Management Commands.
Page 485: Show Policy-Map
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show policy-map show policy-map Use the show policy-map user EXEC command to display quality of service (QoS) policy maps, which define classification criteria for incoming traffic. Policy maps can include policers that specify the bandwidth limitations and the action to take if the limits are exceeded.
Page 486 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show policy-map police 904000 9090909 exceed-action policed-dscp-transmit class class22 police 904000 9090909 exceed-action policed-dscp-transmit Related Commands Command Description mls qos cos policy-map Defines the class of service (CoS) value of a port in a policy map.
Page 487: Show Port-Security
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show port-security show port-security Use the show port-security privileged EXEC command to display port-security settings for an interface or for the switch. show port-security [address] [interface interface-id [address | vlan]] [ | {begin | exclude |...
Page 488 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show port-security Examples This is an example of the output from the show port-security command: Switch# show port-security Secure Port MaxSecureAddr CurrentAddr SecurityViolation Security Action (Count) (Count) (Count) ---------------------------------------------------------------------------- Fa0/1 Shutdown Fa0/5...
Page 489 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show port-security Secure Mac Address Table ------------------------------------------------------------------- Vlan Mac Address Type Ports Remaining Age (mins) ---- ----------- ---- ----- ------------- 0005.0005.0001 SecureConfigured Fa0/5 19 (I) 0005.0005.0002 SecureConfigured Fa0/5 19 (I) 0005.0005.0003 SecureConfigured...
Page 490: Show Power Inline
Use the show power inline user EXEC command to display the power status for the specified Power over Ethernet (PoE) port or for all PoE ports on the Catalyst 3550-24PWR switch. show power inline [interface-id] | {begin | exclude | include} expression]...
Page 491 • Power The supplied power in watts. A Cisco device shows reported power; a non-Cisco device is shown as an IEEE powered device at 15.4 W. Device The device type detected: n/a, unknown, Cisco PD, IEEE PD, <name from CDP>.
Page 492: Show Running-Config Vlan
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show running-config vlan show running-config vlan Use the show running-config vlan privileged EXEC command to display all or a range of VLAN-related configurations on the switch. show running-config vlan [vlan-ids] [ | {begin | exclude | include} expression]...
Page 493 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show running-config vlan Related Commands Command Description show running-config Displays the running configuration on the switch. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 >...
Page 494: Show Sdm Prefer
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show sdm prefer show sdm prefer Use the show sdm prefer privileged EXEC command to display information about the templates that can be used to maximize system resources for a particular feature, or use the command without a keyword to display the template in use.
Page 495: Show Sdm Prefer
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show sdm prefer Switch# show sdm prefer The current template is default template. The selected template optimizes the resources in the switch to support this level of features for 16 routed interfaces and 1K VLANs.
Page 496: Show Setup Express
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show setup express show setup express Use the show setup express privileged EXEC command to show if Express Setup mode is active on the switch. show setup express Syntax Description This command has no arguments or keywords.
Page 497: Show Spanning-Tree
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show spanning-tree show spanning-tree Use the show spanning-tree user EXEC command to display spanning-tree state information. show spanning-tree [bridge-group | active [detail] | backbonefast | blockedports | bridge | detail [active] | inconsistentports | interface interface-id | mst | pathcost method | root | summary...
Page 498 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show spanning-tree interface interface-id (Optional) Display spanning-tree information for the specified interface [active [detail] | cost | (all options except portfast and state only available in privileged EXEC detail [active] | mode). Enter each interface separated by a space. Ranges are not inconsistency | portfast | supported.
Page 499 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show spanning-tree uplinkfast (Optional) Display spanning-tree UplinkFast status. vlan vlan-id [active (Optional) Display spanning-tree information for the specified VLAN [detail] | backbonefast | (some keywords only available in privileged EXEC mode). The range is blockedports | bridge 1 to 4094.
Page 500 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show spanning-tree This is an example of output from the show spanning-tree detail command: Switch> show spanning-tree detail VLAN0001 is executing the ieee compatible Spanning Tree protocol Bridge Identifier has priority 32768, sysid 1, address 0008.205e.6600 Configured hello time 2, max age 20, forward delay 15 Current root has priority 20481, address 0008.217a.5800...
Page 501 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show spanning-tree -------- --------------------------------------------------------------------- 101-4094 1-100 ------------------------------------------------------------------------------- This is an example of output from the show spanning-tree mst interface fastethernet0/1 command: Switch# show spanning-tree mst interface fastethernet0/1 FastEthernet0/1 of MST00 is designated forwarding...
Page 502 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show spanning-tree Command Description spanning-tree mst configuration Enters multiple spanning-tree (MST) configuration mode through which the MST region configuration occurs. spanning-tree mst cost Sets the path cost for MST calculations. spanning-tree mst forward-time Sets the forward-delay time for all MST instances.
Page 503: Show Storm-Control
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show storm-control show storm-control Use the show storm-control user EXEC command to display broadcast, multicast, or unicast storm-control settings on the switch or on the specified interface. show storm-control [interface-id] [broadcast | multicast | unicast] [ | {begin | exclude | include}...
Page 504 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show storm-control This is an example of output from the show storm-control command for a specified interface. Because no traffic type keyword was entered, the broadcast storm control settings appear. Switch> show storm-control fastethernet0/1...
Page 505: Show System Mtu
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show system mtu show system mtu Use the show system mtu privileged EXEC command to display the global maximum transmission unit (MTU) or maximum packet size set for the switch. show system mtu [ | {begin | exclude | include} expression]...
Page 506: Show Tcam
(see the show fm command). Port labels are used for port ACLs. This display output is a raw hex dump of information, intended for a Cisco technical support representative. The range is 0 to 127. size Display the total size of the regions of TCAM in which the ACLs are entered.
Page 507 Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear. These displays provide information that might be useful for Cisco technical support representatives troubleshooting the switch.
Page 508 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show tcam This is an example of output from the show tcam outacl masks command for TCAM 1: Switch> show tcam outacl 1 masks Number of active masks : 6 Mask Index : 0...
Page 509: Show Tcam Pbr
PBR. vlan-labels [label-id] Display entries and associated information for a PBR VLAN label. This display output is a raw hex dump of information intended for a Cisco technical support representative. The range is 0 to 255. masks [mask-id] Display mask information.
Page 510: Show Tcam Pbr
You can use the show fm interface interface-id command to display the policy label for the interface on which PBR is enabled. These displays provide information that might be useful for Cisco technical support representatives troubleshooting the switch.
Page 511: Show Tcam Qos
The range is 0 to 65535. port-labels [label-id] Display entries and associated information for a QoS port label. This display output is a raw hex dump of information intended for a Cisco technical support representative. The range is 0 to 255. vlan-labels [label-id] Display entries and associated information for a QoS VLAN label.
Page 512 QoS information. You also can use the show tcam qos tcam-id port-labels [label-id] vlan-labels [label-id] command to display per-port per-VLAN TCAM entries with both the port label and the VLAN label. These displays provide information that might be useful for Cisco technical support representatives troubleshooting the switch. Examples This is an example of output from the show tcam qos masks command for TCAM 2: Switch>...
Page 513: Show Udld
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show udld show udld Use the show udld user EXEC command to display UniDirectional Link Detection (UDLD) administrative and operational status for all ports or the specified port. show udld [interface-id] [ | {begin | exclude | include} expression]...
Page 514 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show udld Table 2-27 show udld Field Descriptions Field Description Interface The interface on the local device configured for UDLD. Port enable administrative How UDLD is configured on the port. If UDLD is enabled or...
Page 515 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show udld Switch# show udld gigabitethernet0/1 Interface Gi0/1 Port enable administrative configuration setting:Enabled / in aggressive mode Port enable operational state:Enabled / in aggressive mode Current bidirectional state:Unknown Current operational state:Link down...
Page 516: Show Version
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show version show version Use the show version user EXEC command to display version information for the hardware and firmware. show version [ | {begin | exclude | include} expression] Syntax Description | begin (Optional) Display begins with the line that matches the expression.
Page 517: Show Version
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show version The password-recovery mechanism is enabled. 384K bytes of flash-simulated non-volatile configuration memory. Base ethernet MAC Address: 00:02:4B:29:2B:00 Configuration register is 0x10F Catalyst 3550 Multilayer Switch Command Reference 2-491 OL-8566-01...
Page 518: Show Vlan
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show vlan show vlan Use the show vlan user EXEC command to display the parameters for all configured VLANs or one VLAN (if the VLAN ID or name is specified) on the switch.
Page 519: Show Vlan
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show vlan Examples This is an example of output from the show vlan command. Table 2-28 describes each field in the display. Switch> show vlan VLAN Name Status Ports ---- -------------------------------- --------- -------------------------------...
Page 520 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show vlan Table 2-28 show vlan Command Output Fields (continued) Field Description BrdgNo Bridge number for the VLAN, if applicable. Spanning Tree Protocol type used on the VLAN. BrdgMode Bridging mode for this VLAN—possible values are source-route bridging (SRB) and source-route transparent (SRT);...
Page 521 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show vlan This is an example of output from the show vlan internal usage command. It shows that VLANs 1025 and 1026 are being used as internal VLANs for Fast Ethernet routed ports 23 and 24. If you want to use one of these VLAN IDs, you must first shut down the routed port, which releases the internal VLAN, and then create the extended-range VLAN.
Page 522: Show Vlan Access-Map
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show vlan access-map show vlan access-map Use the show vlan access-map privileged EXEC command to display information about a particular VLAN access map or all VLAN access maps. show vlan access-map [mapname] [ | {begin | exclude | include} expression]...
Page 523: Show Vlan Filter
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show vlan filter show vlan filter Use the show vlan filter privileged EXEC command to display information about all VLAN filters or about a particular VLAN or VLAN access map. show vlan filter [access-map name | vlan vlan-id] [ | {begin | exclude | include} expression]...
Page 524: Show Vmps
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show vmps show vmps Use the show vmps user EXEC command without keywords to display the VLAN Query Protocol (VQP) version, reconfirmation interval, retry count, VLAN Membership Policy Server (VMPS) IP addresses, and the current and primary servers, or use the statistics keyword to display client-side statistics.
Page 525 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show vmps Wrong Version: Insufficient Resource: 0 Table 2-29 show vmps statistics Field Descriptions Field Description VQP Queries Number of queries sent by the client to the VMPS. VQP Responses Number of responses sent to the client from the VMPS.
Page 526: Show Vtp
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show vtp show vtp Use the show vtp user EXEC command to display general information about the VLAN Trunking Protocol (VTP) management domain, status, and counters. show vtp {counters | status} [ | {begin | exclude | include} expression]...
Page 527: Show Vtp
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show vtp Table 2-30 show vtp counters Field Descriptions Field Description Summary advertisements Number of summary advertisements received by this switch on its trunk ports. Summary received advertisements contain the management domain name, the configuration revision number, the update timestamp and identity, the authentication checksum, and the number of subset advertisements to follow.
Page 528 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show vtp Table 2-30 show vtp counters Field Descriptions (continued) Field Description Join Received Number of VTP pruning messages received on the trunk. Summary Advts Received Number of VTP summary messages received on the trunk from devices that do not support from non-pruning-capable pruning.
Page 529 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands show vtp Table 2-31 show vtp status Field Descriptions (continued) Field Description VTP Domain Name Name that identifies the administrative domain for the switch. VTP Pruning Mode Displays whether pruning is enabled or disabled. Enabling pruning on a VTP server enables pruning for the entire management domain.
Page 530: Shutdown
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands shutdown shutdown Use the shutdown interface configuration command to disable an interface. Use the no form of this command to restart a disabled port or a switch virtual interface (SVI). shutdown no shutdown Syntax Description This command has no arguments or keywords.
Page 531: Shutdown Vlan
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands shutdown vlan shutdown vlan Use the shutdown vlan global configuration command to shut down (suspend) local traffic on the specified VLAN. Use the no form of this command to restart local traffic on the VLAN.
Page 532: Skip-Loopback-Test
Use this command in rare situations when an interface fails POST but the switch hardware is known to be fully functional as is the case when the Gigabit port of a Catalyst 3550 switch with inline power (WS-C3550-25-PWR) is connected to the Gigabit port of a Catalyst 4000 series switch with Supervisor Model WS-X4516 running Cisco IOS release 12.2(18)EW or 12.2(20)EW.
Page 533: Snmp-Server Enable Traps
[bgp | bridge | cluster | config | copy-config | entity | envmon | flash | hsrp | ipmulticast | mac-notification | msdp | ospf [cisco-specific | errors | lsa | rate-limit | retransmit | state-change] | pim [invalid-pim-message | neighbor-change |...
Page 534 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands snmp-server enable traps ospf [cisco-specific | (Optional) Enable Open Shortest Path First (OSPF) traps. The keywords errors | lsa | rate-limit | have these meanings: retransmit | cisco-specific—(Optional) Enable Cisco-specific traps. •...
Page 535 The authentication, bridge, coldstart, copy-config, flash, linkdown, linkup, stpx, syslog, vlancreate, vlandelete, and warmstart keywords were added. 12.2(25)SE The ipmulticast, msdp, ospf [cisco-specific | errors | lsa | rate-limit | retransmit | state-change], pim [invalid-pim-message | neighbor-change | rp-mapping-change], storm-control trap-rate value, and tty keywords were added.
Page 536 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands snmp-server enable traps Related Commands Command Description show running-config Displays the running configuration on the switch. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 >...
Page 537: Snmp-Server Host
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands snmp-server host snmp-server host Use the snmp-server host global configuration command to specify the recipient (host) of a Simple Network Management Protocol (SNMP) notification operation. Use the no form of this command to remove the specified host.
Page 538 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands snmp-server host community-string Password-like community string sent with the notification operation. Though you can set this string by using the snmp-server host command, we recommend that you define this string by using the snmp-server community global configuration command before using the snmp-server host command.
Page 539 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands snmp-server host Defaults This command is disabled by default. No notifications are sent. If you enter this command with no keywords, the default is to send all trap types to the host. No informs are sent to this host.
Page 540 The community string is defined as comaccess: Switch(config)# snmp-server enable traps Switch(config)# snmp-server host myhost.cisco.com comaccess snmp This example shows how to enable the switch to send all traps to the host myhost.cisco.com by using the community string public: Switch(config)# snmp-server enable traps Switch(config)# snmp-server host myhost.cisco.com public...
Page 541: Snmp-Server Ip
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands snmp-server ip snmp-server ip Use the snmp-server ip global configuration command to prioritize Simple Network Management Protocol (SNMP) notifications using either IP precedence or Differentiated Services Code Point (DSCP) marking. Use the no form of this command to return to the default setting.
Page 542 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands snmp-server ip Related Commands Command Description show running-config Displays the running configuration on the switch. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 >...
Page 543: Snmp Trap Mac-Notification
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands snmp trap mac-notification snmp trap mac-notification Use the snmp trap mac-notification interface configuration command to enable the Simple Network Management Protocol (SNMP) MAC address notification trap on a specific Layer 2 interface. Use the no form of this command to return to the default setting.
Page 544 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands snmp trap mac-notification Command Description show mac address-table notification Displays the MAC address notification settings for all interfaces or on the specified interface when the interface keyword is appended. snmp-server enable traps Sends the SNMP MAC notification traps when the mac-notification keyword is appended.
Page 545: Spanning-Tree Backbonefast
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree backbonefast spanning-tree backbonefast Use the spanning-tree backbonefast global configuration command to enable the BackboneFast feature. Use the no form of this command to return to the default setting. spanning-tree backbonefast no spanning-tree backbonefast Syntax Description This command has no arguments or keywords.
Page 546: Spanning-Tree Bpdufilter
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree bpdufilter spanning-tree bpdufilter Use the spanning-tree bpdufilter interface configuration command to prevent a port from sending or receiving bridge protocol data units (BPDUs). Use the no form of this command to return to the default setting.
Page 547 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree bpdufilter Related Commands Command Description show running-config Displays the current operating configuration. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands >...
Page 548: Spanning-Tree Bpduguard
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree bpduguard spanning-tree bpduguard Use the spanning-tree bpduguard interface configuration command to put a port in the error-disabled state when it receives a bridge protocol data unit (BPDU). Use the no form of this command to return to the default setting.
Page 549 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree bpduguard Related Commands Command Description show running-config Displays the current operating configuration. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands >...
Page 550: Spanning-Tree Cost
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree cost spanning-tree cost Use the spanning-tree cost interface configuration command to set the path cost for spanning-tree calculations. If a loop occurs, spanning tree considers the path cost when selecting an interface to place in the forwarding state.
Page 551 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree cost This example shows how to set a path cos]t of 300 for VLANs 10, 12 to 15, and 20: Switch(config-if)# spanning-tree vlan 10,12-15,20 cost 300 You can verify your settings by entering the show spanning-tree interface interface-id privileged EXEC command.
Page 552: Spanning-Tree Etherchannel Guard Misconfig
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree etherchannel guard misconfig spanning-tree etherchannel guard misconfig Use the spanning-tree etherchannel guard misconfig global configuration command to display an error message when the switch detects a loop that occurred because of an EtherChannel misconfiguration.
Page 553 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree etherchannel guard misconfig Related Commands Command Description errdisable recovery cause Enables the timer to recover from the EtherChannel channel-misconfig misconfiguration error-disable state. show etherchannel summary Displays EtherChannel information for a channel as a one-line summary for each channel group.
Page 554: Spanning-Tree Extend System-Id
This command was introduced. Usage Guidelines In Cisco IOS Release 12.1(8)EA1 and later, Catalyst 3550 switches support the IEEE 802.1t spanning-tree extensions, and some of the bits previously used for the switch priority are now used for the extended system ID (VLAN identifier for the per-VLAN spanning-tree plus [PVST+] and rapid PVST+ or an instance identifier for the multiple spanning tree [MST]).
Page 555 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree extend system-id Related Commands Command Description show spanning-tree summary Displays a summary of spanning-tree port states. spanning-tree mst root Configures the multiple spanning-tree (MST) root switch priority and timers based on the network diameter.
Page 556: Spanning-Tree Guard
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree guard spanning-tree guard Use the spanning-tree guard interface configuration command to enable root guard or loop guard on all the VLANs associated with the selected interface. Root guard restricts which interface is allowed to be the spanning-tree root port or the path-to-the root for the switch.
Page 557 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree guard Loop guard is most effective when it is configured on the entire switched network. When the switch is operating in PVST+ or rapid-PVST+ mode, loop guard prevents alternate and root ports from becoming designated ports, and spanning tree does not send bridge protocol data units (BPDUs) on root or alternate ports.
Page 558: Spanning-Tree Link-Type
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree link-type spanning-tree link-type Use the spanning-tree link-type interface configuration command to override the default link-type setting, which is determined by the duplex mode of the port, and to enable Rapid Spanning-Tree Protocol (RSTP) transitions to the forwarding state.
Page 559: Spanning-Tree Loopguard Default
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree loopguard default spanning-tree loopguard default Use the spanning-tree loopguard default global configuration command to prevent alternate or root ports from becoming designated ports because of a failure that leads to a unidirectional link. Use the no form of this command to return to the default setting.
Page 560 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree loopguard default Related Commands Command Description show running-config Displays the current operating configuration. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 >...
Page 561: Spanning-Tree Mode
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree mode spanning-tree mode Use the spanning-tree mode global configuration command to enable per-VLAN spanning-tree plus (PVST+), rapid PVST+, or multiple spanning tree (MST) on your switch. Use the no form of this command to return to the default setting.
Page 562 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree mode Related Commands Command Description show running-config Displays the current operating configuration. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 >...
Page 563: Spanning-Tree Mst Configuration
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree mst configuration spanning-tree mst configuration Use the spanning-tree mst configuration global configuration command to enter multiple spanning-tree (MST) configuration mode through which you configure the MST region. Use the no form of this command to return to the default settings.
Page 564 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree mst configuration When you map VLANs to an MST instance, the mapping is incremental, and the VLANs specified in the command are added to or removed from the VLANs that were previously mapped. To specify a range, use a hyphen;...
Page 565: Spanning-Tree Mst Cost
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree mst cost spanning-tree mst cost Use the spanning-tree mst cost interface configuration command to set the path cost for multiple spanning-tree (MST) calculations. If a loop occurs, spanning tree considers the path cost when selecting an interface to put in the forwarding state.
Page 566 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree mst cost Related Commands Command Description show spanning-tree Displays MST information for the specified interface. interface interface-id spanning-tree mst Configures an interface priority. port-priority spanning-tree mst priority Configures the switch priority for the specified spanning-tree instance.
Page 567: Spanning-Tree Mst Forward-Time
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree mst forward-time spanning-tree mst forward-time Use the spanning-tree mst forward-time global configuration command to set the forward-delay time for all multiple spanning-tree (MST) instances. The forwarding time determines how long each of the listening and learning states last before the interface begins forwarding.
Page 568: Spanning-Tree Mst Hello-Time
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree mst hello-time spanning-tree mst hello-time Use the spanning-tree mst hello-time global configuration command to set the interval between hello bridge protocol data units (BPDUs) sent by root switch configuration messages. Use the no form of this command to return to the default setting.
Page 569: Spanning-Tree Mst Max-Age
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree mst max-age spanning-tree mst max-age Use the spanning-tree mst max-age global configuration command to set the interval between messages that the spanning tree receives from the root switch. If a switch does not receive a bridge protocol data unit (BPDU) message from the root switch within this interval, it recomputes the spanning-tree topology.
Page 570: Spanning-Tree Mst Max-Hops
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree mst max-hops spanning-tree mst max-hops Use the spanning-tree mst max-hops global configuration command to set the number of hops in a region before the bridge protocol data unit (BPDU) is discarded and the information held for a port is aged.
Page 571: Spanning-Tree Mst Port-Priority
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree mst port-priority spanning-tree mst port-priority Use the spanning-tree mst port-priority interface configuration command to configure an interface priority. If a loop occurs, the Multiple Spanning Tree Protocol (MSTP) can determine which interface to put in the forwarding state.
Page 572 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree mst port-priority Related Commands Command Description show spanning-tree mst interface Displays MST information for the specified interface. interface-id spanning-tree mst cost Sets the path cost for MST calculations. spanning-tree mst priority Sets the switch priority for the specified spanning-tree instance.
Page 573: Spanning-Tree Mst Pre-Standard
(CIST) runs on this interface. If a switch port is connected to a switch running prestandard Cisco IOS software, you must use the Note spanning-tree mst pre-standard interface configuration command on the port. If you do not configure the port to send only prestandard BPDUs, the Multiple Spanning-Tree Protocol (MSTP) performance might diminish.
Page 574: Spanning-Tree Mst Priority
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree mst priority spanning-tree mst priority Use the spanning-tree mst priority global configuration command to set the switch priority for the specified spanning-tree instance. Use the no form of this command to return to the default setting.
Page 575: Spanning-Tree Mst Root
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree mst root spanning-tree mst root Use the spanning-tree mst root global configuration command to configure the multiple spanning-tree (MST) root switch priority and timers based on the network diameter. Use the no form of this command to return to the default setting.
Page 576 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree mst root When you enter the spanning-tree mst instance-id root secondary command, because of support for the extended system ID, the software changes the switch priority from the default value (32768) to 28672.
Page 577: Spanning-Tree Port-Priority
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree port-priority spanning-tree port-priority Use the spanning-tree port-priority interface configuration command to configure an interface priority. If a loop occurs, spanning tree can determine which interface to put in the forwarding state. Use the no form of this command to return to the default setting.
Page 578 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree port-priority Related Commands Command Description show spanning-tree interface Displays spanning-tree information for the specified interface. interface-id spanning-tree cost Sets the path cost for spanning-tree calculations. spanning-tree vlan priority Sets the switch priority for the specified spanning-tree instance.
Page 579: Spanning-Tree Portfast (Global Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree portfast (global configuration) spanning-tree portfast (global configuration) Use the spanning-tree portfast global configuration command to globally enable bridge protocol data unit (BPDU) filtering on Port Fast-enabled ports, the BPDU guard feature on Port Fast-enabled ports, or the Port Fast feature on all nontrunking ports.
Page 580: Spanning-Tree Portfast (Global Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree portfast (global configuration) Enabling BPDU filtering on an interface is the same as disabling spanning tree on it and can result in Caution spanning-tree loops. Use the spanning-tree portfast bpduguard default global configuration command to globally enable BPDU guard on ports that are in a Port Fast-operational state.
Page 581: Spanning-Tree Portfast (Interface Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree portfast (interface configuration) spanning-tree portfast (interface configuration) Use the spanning-tree portfast interface configuration command to enable the Port Fast feature on an interface in all its associated VLANs. When the Port Fast feature is enabled, the interface changes directly from a blocking state to a forwarding state without making the intermediate spanning-tree state changes.
Page 582: Spanning-Tree Portfast (Interface Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree portfast (interface configuration) Examples This example shows how to enable the Port Fast feature on an interface: Switch(config)# interface fastethernet0/2 Switch(config-if)# spanning-tree portfast You can verify your settings by entering the show running-config privileged EXEC command.
Page 583: Spanning-Tree Stack-Port
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree stack-port spanning-tree stack-port Use the spanning-tree stack-port interface configuration command to enable cross-stack UplinkFast (CSUF) on an interface and to accelerate the choice of a new root port when a link or switch fails or when spanning tree reconfigures itself.
Page 584 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree stack-port Related Commands Command Description show running-config Displays the current operating configuration. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Command Reference, Release 12.2 > File Management Commands >...
Page 585: Spanning-Tree Transmit Hold-Count
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree transmit hold-count spanning-tree transmit hold-count Use the spanning-tree transmit hold-count command to configure the number of bridge protocol data units (BPDUs) sent every second. Use the no form of this command to return to the default setting.
Page 586: Spanning-Tree Uplinkfast
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree uplinkfast spanning-tree uplinkfast Use the spanning-tree uplinkfast global configuration command to accelerate the choice of a new root port when a link or switch fails or when the spanning tree reconfigures itself. Use the no form of this command to return to the default setting.
Page 587 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree uplinkfast Do not enable the root guard on interfaces that will be used by the UplinkFast feature. With UplinkFast, the backup interfaces (in the blocked state) replace the root port in the case of a failure. However, if root guard is also enabled, all the backup interfaces used by the UplinkFast feature are placed in the root-inconsistent state (blocked) and prevented from reaching the forwarding state.
Page 588: Spanning-Tree Vlan
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree vlan spanning-tree vlan Use the spanning-tree vlan global configuration command to configure spanning tree on a per-VLAN basis. Use the no form of this command to return to the default setting.
Page 589 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree vlan Command History Release Modification 12.1(4)EA1 This command was introduced. 12.1(8)EA1 The priority priority range changed from 1 to 65535 to 1 to 61440 (in increments of 4096). 12.1(13)EA1 The value for the vlan-id variable was changed.
Page 590 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands spanning-tree vlan This example shows how to set the spanning-tree hello-delay time to 3 seconds for VLANs 20 to 24: Switch(config)# spanning-tree vlan 20-24 hello-time 3 This example shows how to set spanning-tree max-age to 30 seconds for VLAN 20:...
Page 591: Speed
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands speed speed Use the speed interface configuration command to specify the speed of a 10/100 Mbps or 10/100/1000 Mbps port. Use the no or default form of this command to return the port to its default value.
Page 592 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands speed If the speed is set to auto, the switch negotiates with the device at the other end of the link for the speed setting and then forces the speed setting to the negotiated value. The duplex setting remains as configured on each end of the link, which could result in a duplex setting mismatch.
Page 593: Storm-Control
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands storm-control storm-control Use the storm-control interface configuration command to configure broadcast, multicast, or unicast storm control with a specific suppression-level threshold on an interface. Use the no form of this command to return to the default setting.
Page 594 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands storm-control Command History Release Modification 12.1(8)EA1 This command was introduced. It replaces the switchport broadcast, switchport multicast, and switchport unicast interface configuration commands. 12.1(22)EA1 The level level [.level] option was replaced with the level level [level-low] option.
Page 595 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands storm-control This example shows how to enable unicast storm control on a port with a 87-percent rising suppression level and a 65-percent falling suppression level: Switch(config-if)# storm-control unicast level 87 65 This example shows how to enable multicast storm control on a port with a 2000-packets-per-second...
Page 596: Switchcore
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchcore switchcore Use the switchcore global configuration command to reserve switch resources for high-priority traffic or to give buffer storage more priority than packet retrieval. Use the no form of this command to return to the default setting.
Page 597 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchcore Related Commands Command Description show controllers switch Displays the setting of the resource-allocation priority feature resource-allocation priority or the wirespeed-store. show controllers switch wirespeed-store Catalyst 3550 Multilayer Switch Command Reference 2-571...
Page 598: Switchport
This example shows how to cause an interface to cease operating as a Layer 2 port and become a Cisco-routed port: Switch(config-if)# no switchport This example shows how to cause the port interface to cease operating as a Cisco-routed port and convert to a Layer 2-switched interface: Switch(config-if)# switchport...
Page 599 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport You can verify the switchport status of an interface by entering the show running-config privileged EXEC command. Related Commands Command Description show interfaces switchport Displays the administrative and operational status of a switching (nonrouting) port, including port blocking and port protection settings.
Page 600: Switchport Access
The software implements the VLAN Query Protocol (VQP) client, which can query a VMPS such • as a Catalyst 6000 series switch. The Catalyst 3550 switches are not VMPS servers. The VMPS server must be configured before a port is configured as dynamic.
Page 601 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport access Use dynamic-access ports only to connect end stations. Connecting them to switches or routers (that • use bridging protocols) can cause a loss of connectivity. • Configure the network so that STP does not put the dynamic-access port into an STP blocking state.
Page 602: Switchport Backup Interface
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport backup interface switchport backup interface Use the switchport backup interface interface configuration command on a Layer 2 interface to configure Flex Links, a pair of interfaces that provide backup to each other. Use the no form of this command to remove the Flex Links configuration.
Page 603: Switchport Backup Interface
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport backup interface Usage Guidelines With Flex Links configured, one link acts as the primary interface and forwards traffic, while the other interface is in standby mode, ready to begin forwarding traffic if the primary link shuts down. The interface being configured is referred to as the active link;...
Page 604 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport backup interface Related Commands Command Description show interfaces [interface-id] Displays the configured Flex Links and their status on the switch or switchport backup for the specified interface. Catalyst 3550 Multilayer Switch Command Reference...
Page 605: Switchport Block
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport block switchport block Use the switchport block interface configuration command to prevent unknown multicast or unicast packets from being forwarded. Use the no form of this command to return to the default setting.
Page 606: Switchport Broadcast
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport broadcast switchport broadcast This is an obsolete command. In past releases, the switchport broadcast interface configuration command was used to set the broadcast suppression level on the interface. This command is replaced by the storm-control broadcast interface configuration command.
Page 607: Switchport Host
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport host switchport host Use the switchport host interface configuration command on the switch to optimize a Layer 2 port for a host connection. The no form of this command has no affect on the system.
Page 608: Switchport Host
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport host Related Commands Command Description show interfaces switchport Displays the administrative and operational status of a switching (nonrouting) port, including switchport mode. show running-config Displays the running configuration on the interface.
Page 609: Switchport Mode
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport mode switchport mode Use the switchport mode interface configuration command to configure the VLAN membership mode of a port. Use the no form of this command to reset the mode to the appropriate default for the device.
Page 610 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport mode When you enter dynamic desirable mode, the interface becomes a trunk interface if the neighboring interface is set to trunk, desirable, or auto mode. To autonegotiate trunking, the interfaces must be in the same VTP domain. Trunk negotiation is managed by the Dynamic Trunking Protocol (DTP), which is a point-to-point protocol.
Page 611 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport mode For more information about configuring IEEE 802.1Q tunnel ports, see the software configuration guide Note for this release. Examples This example shows how to configure a port for access mode:...
Page 612: Switchport Multicast
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport multicast switchport multicast This is an obsolete command. In past releases, the switchport multicast interface configuration command was used to set the multicast suppression level on the interface. This command is replaced by the storm-control multicast interface configuration command.
Page 613: Switchport Nonegotiate
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport nonegotiate switchport nonegotiate Use the switchport nonegotiate interface configuration command to specify that Dynamic Trunking Protocol (DTP) negotiation packets are not sent on the Layer 2 interface. The switch does not engage in DTP negotiation on this interface.
Page 614: Switchport Nonegotiate
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport nonegotiate Related Commands Command Description show interfaces switchport Displays the administrative and operational status of a switching (nonrouting) port, including port blocking and port protection settings. switchport mode Configures the VLAN membership mode of a port.
Page 615: Switchport Port-Security
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport port-security switchport port-security Use the switchport port-security interface configuration command without keywords to enable port security on the interface. Use the keywords to configure secure MAC addresses, sticky MAC address learning, a maximum number of secure MAC addresses, or the violation mode. Use the no form of this command to disable port security or to set the parameters to their default states.
Page 616 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport port-security violation (Optional) Set the security violation mode or the action to be taken if port security is violated. The default is shutdown. protect Set the security violation protect mode. In this mode, when the number...
Page 617 Cisco IP phone requires up to two MAC addresses. The Cisco IP phone address is learned on the voice VLAN, but is not learned on the access VLAN. If you connect a single PC to the Cisco IP phone, no additional MAC addresses are required. If you connect more than one PC to the Cisco IP phone, you must configure enough secure addresses to allow one for each PC and one for the phone.
Page 618 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport port-security When you configure sticky secure MAC addresses by using the switchport port-security • mac-address sticky mac-address interface configuration command, these addresses are added to the address table and the running configuration. If port security is disabled, the sticky secure MAC addresses remain in the running configuration.
Page 619: Switchport Port-Security Aging
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport port-security aging switchport port-security aging Use the switchport port-security aging interface configuration command to set the aging time and type for secure address entries or to change the aging behavior for statically configured secure addresses on a particular port.
Page 620 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport port-security aging To allow unlimited access to a secure address, configure it as a secure address, and disable aging for the statically configured secure address by using the no switchport port-security aging static interface configuration command.
Page 621: Switchport Priority Extend
The none keyword was removed and was replaced by the trust keyword. Usage Guidelines In Cisco IOS Release 12.1(13)EA1 or later, the trust keyword replaces the none keyword. To instruct the IP Phone to not trust the priority, you can use the no switchport priority extend or the switchport priority extend cos 0 interface configuration command.
Page 622: Switchport Priority Extend
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport priority extend Related Commands Command Description show interfaces Displays the administrative and operational status of a switching (nonrouting) port. switchport voice vlan Configures the voice VLAN on the port. Catalyst 3550 Multilayer Switch Command Reference...
Page 623: Switchport Protected
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport protected switchport protected Use the switchport protected interface configuration command to isolate unicast, multicast, and broadcast traffic at Layer 2 from other protected ports on the same switch. Use the no form of this command to return to the default setting.
Page 624: Switchport Trunk
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport trunk switchport trunk Use the switchport trunk interface configuration command to set the trunk characteristics when the interface is in trunking mode. Use the no form of this command to reset a trunking characteristic to the default.
Page 625 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport trunk Separate nonconsecutive VLAN IDs with a comma; use a hyphen to designate a range of IDs. except lists the VLANs that should be calculated by inverting the defined list of VLANs. (VLANs •...
Page 626 VLAN trunk port by removing VLAN 1 from the allowed list. This is known as VLAN 1 minimization. VLAN 1 minimization disables VLAN 1 (the default VLAN on all Cisco switch trunk ports) on an individual VLAN trunk link. As a result, no user traffic, including spanning-tree advertisements, is sent or received on VLAN 1.
Page 627: Switchport Unicast
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport unicast switchport unicast This is an obsolete command. In past releases, the switchport unicast interface configuration command was used to set the multicast suppression level on the interface. This command is replaced by the storm-control unicast interface configuration command.
Page 628: Switchport Voice Vlan
IP phone requires one MAC address. The Cisco IP phone address is learned on the voice VLAN, but is not learned on the access VLAN. If you connect a single PC to the Cisco IP phone, no additional MAC addresses are required.
Page 629: Switchport Voice Vlan
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands switchport voice vlan Examples This example shows how to configure VLAN 2 as the voice VLAN: Switch(config-if)# switchport voice vlan 2 You can verify your settings by entering the show interfaces interface-id switchport privileged EXEC command.
Page 630: System Mtu
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands system mtu system mtu Use the system mtu global configuration command to set the maximum packet size or maximum transmission unit (MTU) size for the switch. Use the no form of this command to return to the default setting.
Page 631: System Mtu
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands system mtu Related Commands Command Description show system mtu Displays the maximum packet size set for the switch. Catalyst 3550 Multilayer Switch Command Reference 2-605 OL-8566-01...
Page 632 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands system mtu Catalyst 3550 Multilayer Switch Command Reference 2-606 OL-8566-01...
Page 633: Traceroute Mac
This command was introduced. Usage Guidelines For Layer 2 traceroute to functional properly, Cisco Discovery Protocol (CDP) must be enabled on all the switches in the network. Do not disable CDP. When the switch detects a device in the Layer 2 path that does not support Layer 2 traceroute, the switch continues to send Layer 2 trace queries and lets them time out.
Page 634 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands traceroute mac Examples This example shows how to display the Layer 2 path by specifying the source and destination MAC addresses: Switch# traceroute mac 0000.0201.0601 0000.0201.0201 Source 0000.0201.0601 found on con6[WS-C2950G-24-EI] (2.2.6.6) con6 (2.2.6.6) :Fa0/1 =>...
Page 635 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands traceroute mac This example shows the Layer 2 path when the source and destination devices are in different VLANs: Switch# traceroute mac 0000.0201.0601 0000.0301.0201 Error:Source and destination macs are on different vlans.
Page 636: Traceroute Mac Ip
This command was introduced. Usage Guidelines For Layer 2 traceroute to functional properly, Cisco Discovery Protocol (CDP) must be enabled on all the switches in the network. Do not disable CDP. When the switch detects an device in the Layer 2 path that does not support Layer 2 traceroute, the switch continues to send Layer 2 trace queries and lets them time out.
Page 637: Traceroute Mac Ip
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands traceroute mac ip The Layer 2 traceroute feature is not supported when multiple devices are attached to one port through hubs (for example, multiple CDP neighbors are detected on a port). When more than one CDP neighbor is detected on a port, the Layer 2 path is not identified, and an error message appears.
Page 638: Trust
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands trust trust Use the trust policy-map class configuration command to define a trust state for traffic classified by the class or the class-map command. Use the no form of this command to return to the default setting.
Page 639 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands trust The only match criterion in a policy map that can be attached to an egress interface is the match ip dscp dscp-list class-map configuration command. If you specify trust cos, QoS derives the internal DSCP value by using the received or default port CoS value and the CoS-to-DSCP map.
Page 640: Udld
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands udld udld Use the udld global configuration command to enable aggressive or normal mode in the UniDirectional Link Detection (UDLD) and to set the configurable message timer time. Use the no form of this command to disable aggressive or normal mode UDLD on all fiber-optic ports.
Page 641 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands udld You can use these commands to reset an interface shut down by UDLD: The udld reset privileged EXEC command to reset all interfaces shut down by UDLD • The shutdown and no shutdown interface configuration commands •...
Page 642: Udld Port
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands udld port udld port Use the udld port interface configuration command to enable the UniDirectional Link Detection (UDLD) on an individual interface or prevent a fiber-optic interface from being enabled by the udld global configuration command.
Page 643: Udld Port
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands udld port If the switch software detects a Gigabit Interface Converter (GBIC) module change and the port changes from fiber optic to nonfiber optic or vice versa, all configurations are maintained. You can use these commands to reset an interface shut down by UDLD: The udld reset privileged EXEC command to reset all interfaces shut down by UDLD •...
Page 644: Udld Reset
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands udld reset udld reset Use the udld reset privileged EXEC command to reset all interfaces shutdown by the UniDirectional Link Detection (UDLD) and permit traffic to begin passing through them again (though other features, such as spanning tree, Port Aggregation Protocol (PAgP), and Dynamic Trunking Protocol (DTP) still have their normal effects, if enabled).
Page 645: Vlan (Global Configuration)
VTP mode and the VLAN configuration for the first 1005 VLANs use the VLAN database information. If the image on the switch or the configuration file is earlier than Cisco IOS Release 12.1(9)EA1, • the switch reboots with information in the VLAN database.
Page 646: Vlan (Global Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan (global configuration) Configuration information for normal-range VLANs (VLAN IDs 1 to 1005) is always saved in the VLAN database. If you try to create an extended-range VLAN when the switch is not in VTP transparent mode, the VLAN is rejected, and you receive an error message.
Page 647 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan (global configuration) mtu mtu-size: specifies the maximum transmission unit (MTU) (packet size in bytes). The range is • 1500 to 18190. The default is 1500 bytes. • name vlan-name: names the VLAN with an ASCII string from 1 to 32 characters that must be unique within the administrative domain.
Page 648 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan (global configuration) Table 2-32 Valid Commands and Syntax for Different Media Types Media Type Valid Syntax Ethernet name vlan-name, media ethernet, state {suspend | active}, said said-value, mtu mtu-size, remote-span, tb-vlan1 tb-vlan1-id, tb-vlan2 tb-vlan2-id...
Page 649 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan (global configuration) Table 2-33 VLAN Configuration Rules (continued) Configuration Rule VTP v2 mode is enabled, and you Specify a bridge number. Do not leave this field blank. are configuring a TrBRF VLAN media type.
Page 650 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan (global configuration) Related Commands Command Description show running-config vlan Displays all or a range of VLAN-related configurations on the switch. show vlan Displays the parameters for all configured VLANs or one VLAN (if the VLAN ID or name is specified) in the administrative domain.
Page 651: Vlan (Vlan Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan (VLAN configuration) vlan (VLAN configuration) Use the vlan VLAN configuration command to configure VLAN characteristics for a normal-range VLAN (VLAN IDs 1 to 1005) in the VLAN database. You access VLAN configuration mode by entering vlan database privileged EXEC command.
Page 652: Vlan (Vlan Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan (VLAN configuration) media {ethernet | fddi | fd-net (Optional) Specify the VLAN media type. Table 2-34 lists the valid | tokenring | tr-net} syntax for each media type. ethernet is Ethernet media type (the default).
Page 653 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan (VLAN configuration) Table 2-34 Valid Syntax for Different Media Types Media Type Valid Syntax Ethernet vlan vlan-id [name vlan-name] media ethernet [state {suspend | active}] [said said-value] [mtu mtu-size] [tb-vlan1 tb-vlan1-id] [tb-vlan2 tb-vlan2-id]...
Page 654 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan (VLAN configuration) Table 2-35 VLAN Configuration Rules (continued) Configuration Rule VTP v2 mode is enabled, and you Specify a bridge number. Do not leave this field blank. are configuring a TrBRF VLAN media type.
Page 655 VTP mode and the VLAN configuration for the first 1005 VLANs use VLAN database information. • If the image on the switch or the configuration file is earlier than Cisco IOS Release 12.1(9)EA1, the switch reboots with information in the VLAN database. The following are the results of using the no vlan commands: •...
Page 656 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan (VLAN configuration) When the no vlan vlan-id parent form is used, the parent VLAN returns to the default (0). The • parent VLAN resets to the default if the parent VLAN is deleted or if the media keyword changes the VLAN type or the VLAN type of the parent VLAN.
Page 657: Vlan Access-Map
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan access-map vlan access-map Use the vlan access-map global configuration command to create or modify a VLAN map entry for VLAN packet filtering. This entry changes the mode to the VLAN access map configuration. Use the no form of this command to delete a VLAN map entry.
Page 658 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan access-map For more information about VLAN map entries, see the software configuration guide for this release. Note Examples This example shows how to create a VLAN map named vac1 and apply matching conditions and actions to it.
Page 659: Vlan Database
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan database vlan database Use the vlan database privileged EXEC command to enter VLAN configuration mode. From this mode, you can add, delete, and modify VLAN configurations for normal-range VLANs and globally propagate these changes by using the VLAN Trunking Protocol (VTP).
Page 660 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan database When you have modified VLAN or VTP parameters, you can use these editing buffer manipulation commands: • abort: exits the mode without applying the changes. The VLAN configuration that was running before you entered VLAN configuration mode continues to be used.
Page 661 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan database VLAN ISL Id: 1002 Name: fddi-default Media Type: FDDI VLAN 802.10 Id: 101002 State: Operational MTU: 1500 Bridge Type: SRB Ring Number: 0 Translational Bridged VLAN: 1 Translational Bridged VLAN: 1003 <output truncated>...
Page 662 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan database Related Commands Command Description show vlan Displays the parameters for all configured VLANs in the administrative domain. shutdown vlan Shuts down (suspends) local traffic on the specified VLAN. vlan (global...
Page 663: Vlan Dot1Q Tag Native
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan dot1q tag native vlan dot1q tag native Use the vlan dot1q tag native global configuration command to enable tagging of native VLAN frames on all IEEE 802.1Q trunk ports. Use the no form of this command to return to the default setting.
Page 664 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan dot1q tag native Related Commands Command Description show vlan dot1q tag native Displays IEEE 802.1Q native VLAN tagging status. Catalyst 3550 Multilayer Switch Command Reference 2-638 OL-8566-01...
Page 665: Vlan Filter
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan filter vlan filter Use the vlan filter global configuration command to apply a VLAN map to one or more VLANs. Use the no form of this command to remove the map.
Page 666 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vlan filter Related Commands Command Description show vlan access-map Displays information about a particular VLAN access map or all VLAN access maps. show vlan filter Displays information about all VLAN filters or about a particular VLAN or VLAN access map.
Page 667: Vmps Reconfirm (Privileged Exec)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vmps reconfirm (privileged EXEC) vmps reconfirm (privileged EXEC) Use the vmps reconfirm privileged EXEC command to immediately send VLAN Query Protocol (VQP) queries to reconfirm all dynamic VLAN assignments with the VLAN Membership Policy Server (VMPS).
Page 668: Vmps Reconfirm (Global Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vmps reconfirm (global configuration) vmps reconfirm (global configuration) Use the vmps reconfirm global configuration command to change the reconfirmation interval for the VLAN Query Protocol (VQP) client. Use the no form of this command to return to the default setting.
Page 669: Vmps Retry
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vmps retry vmps retry Use the vmps retry global configuration command to configure the per-server retry count for the VLAN Query Protocol (VQP) client. Use the no form of this command to return to the default setting.
Page 670: Vmps Server
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vmps server vmps server Use the vmps server global configuration command to configure the primary VLAN Membership Policy Server (VMPS) and up to three secondary servers. Use the no form of this command to remove a VMPS server.
Page 671: Vmps Server
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vmps server This example shows how to delete the server with IP address 191.10.49.21: Switch(config)# no vmps server 191.10.49.21 You can verify your setting by entering the show vmps privileged EXEC command and examining information in the VMPS Domain Server row.
Page 672: Vtp (Global Configuration)
VTP administrative domain for the switch. The domain name is case sensitive. file filename Specify the Cisco IOS file system file where the VTP VLAN configuration is stored. interface name Specify the name of the interface providing the VTP ID updated for this device.
Page 673: Vtp (Global Configuration)
• If the image on the switch or the configuration file is earlier than Cisco IOS Release 12.1(9)EA1, the switch reboots using the information in the VLAN database. The vtp file filename cannot be used to load a new database; it renames only the file in which the existing database is stored.
Page 674 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vtp (global configuration) Follow these guidelines when setting VTP mode: The no vtp mode command returns the switch to VTP server mode. • The vtp mode server command is the same as no vtp mode except that it does not return an error •...
Page 675 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vtp (global configuration) If you are using VTP in a Token Ring environment, VTP version 2 must be enabled. • If you are configuring a Token Ring bridge relay function (TrBRF) or Token Ring concentrator relay •...
Page 676: Vtp (Privileged Exec)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vtp (privileged EXEC) vtp (privileged EXEC) Use the vtp privileged EXEC command to configure the VLAN Trunking Protocol (VTP) password, pruning, and version. Use the no form of this command to return to the default settings.
Page 677: Vtp (Privileged Exec)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vtp (privileged EXEC) Each VTP switch automatically detects the capabilities of all the other VTP devices. To use version 2, all VTP switches in the network must support version 2; otherwise, you must configure them to operate in VTP version 1 mode.
Page 678: Vtp (Vlan Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vtp (VLAN configuration) vtp (VLAN configuration) Use the vtp VLAN configuration command to configure VLAN Trunking Protocol (VTP) characteristics. You access VLAN configuration mode by entering the vlan database privileged EXEC command. Use the no form of this command to return to the default settings, disable the characteristic, or remove the password.
Page 679: Vtp (Vlan Configuration)
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vtp (VLAN configuration) Defaults The default mode is server mode. No domain name is defined. No password is configured. Pruning is disabled. VTP version 2 (v2 mode) is disabled. Command Modes VLAN configuration...
Page 680 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vtp (VLAN configuration) Follow these guidelines when configuring a VTP domain name: The switch is in the no-management-domain state until you configure a domain name. While in the • no-management-domain state, the switch does not send any VTP advertisements even if changes occur to the local VLAN configuration.
Page 681 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands vtp (VLAN configuration) This example shows how to enable pruning in the proposed new VLAN database: Switch(vlan)# vtp pruning Pruning switched ON This example shows how to enable v2 mode in the proposed new VLAN database: Switch(vlan)# vtp v2-mode V2 mode enabled.
Page 682: Wrr-Queue Bandwidth
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands wrr-queue bandwidth wrr-queue bandwidth Use the wrr-queue bandwidth interface configuration command to assign weighted round robin (WRR) weights to the egress queues on Gigabit-capable ports and 10/100 Ethernet ports. The ratio of the weights is the ratio of frequency in which the WRR scheduler dequeues packets from each queue.
Page 683 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands wrr-queue bandwidth This example shows how to configure the weight ratio of WRR if the expedite queue is enabled. Three queues participate in WRR, and the bandwidth allocated for each queue is 1/(1+2+3), 2/(1+2+3), 3/(1+2+3), which is 1/6, 1/3, and 1/2 for queues 1, 2, and 3.
Page 684: Wrr-Queue Cos-Map
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands wrr-queue cos-map wrr-queue cos-map Use the wrr-queue cos-map interface configuration command to map assigned class of service (CoS) values to select one of the egress queues. Use the form no of this command to return the CoS map to the default setting.
Page 685 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands wrr-queue cos-map Examples This example shows how to map CoS values 0 and 1 to queue 1, 2 and 3 to queue 2, 4 and 5 to queue 3, 6 and 7 to queue 4:...
Page 686: Wrr-Queue Dscp-Map
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands wrr-queue dscp-map wrr-queue dscp-map Use the wrr-queue dscp-map interface configuration command on an ingress Gigabit-capable Ethernet port to map the Differentiated Services Code Point (DSCP) values to the tail-drop or Weighted Random Early Detection (WRED) thresholds of the egress queues.
Page 687 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands wrr-queue dscp-map Related Commands Command Description show mls qos interface Displays quality of service (QoS) information. wrr-queue cos-map Maps assigned class of service (CoS) ingress values to select one of the egress queues.
Page 688: Wrr-Queue Min-Reserve
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands wrr-queue min-reserve wrr-queue min-reserve Use the wrr-queue min-reserve interface configuration command to assign a minimum-reserve level to a particular egress queue of a 10/100 Ethernet port. Use the no form of this command to return to the default setting.
Page 689: Wrr-Queue Queue-Limit
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands wrr-queue queue-limit wrr-queue queue-limit Use the wrr-queue queue-limit interface configuration command to configure the sizes of the egress queues on Gigabit-capable Ethernet ports. Use the no form of this command to return to the default setting.
Page 690 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands wrr-queue queue-limit Related Commands Command Description show mls qos interface Displays QoS information. wrr-queue bandwidth Assigns weighted round robin (WRR) weights to the egress queues. wrr-queue min-reserve Configures the sizes of the minimum-reserve threshold values of the queues on 10/100 Ethernet ports.
Page 691: Wrr-Queue Random-Detect Max-Threshold
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands wrr-queue random-detect max-threshold wrr-queue random-detect max-threshold Use the wrr-queue random-detect max-threshold interface configuration command to enable Weighted Random Early Detection (WRED) and assign two WRED threshold values to an egress queue of a Gigabit-capable Ethernet port. Use the no form of this command to return to the default setting.
Page 692 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands wrr-queue random-detect max-threshold Examples This example shows how to configure the WRED maximum threshold values for queue 1 from 50 to 100 percent, for queue 2 from 70 to 100 percent, for queue 3 from 50 to 100 percent, and for queue 4 from...
Page 693: Wrr-Queue Threshold
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands wrr-queue threshold wrr-queue threshold Use the wrr-queue threshold interface configuration command to assign tail-drop threshold percentages to each egress queue of a Gigabit-capable Ethernet port. Use the no form of this command to return to the default setting.
Page 694 Chapter 2 Catalyst 3550 Switch Cisco IOS Commands wrr-queue threshold Examples This example shows how to configure the tail-drop thresholds of the four queues. The queue 1 thresholds are 50% and 100%; the queue 2 thresholds are 70% and 100%; queue 3 are thresholds are 80% and 100%;...
Page 695: Appendix
You gain access to the boot loader command line if the switch is set to manually boot, if an error occurs during power-on self test (POST) DRAM testing, or if an error occurs while loading the operating system (a corrupted Cisco IOS image). You can also access the boot loader if you have lost or forgotten the switch password.
Page 696: Boot
Appendix A Catalyst 3550 Switch Boot Loader Commands boot boot Use the boot boot loader command to load and boot an executable image, and enter the command-line interface. boot [-post] filesystem:/file-url ... Syntax Description -post (Optional) Run the loaded image with an extended or comprehensive power-on self-test (POST).
Page 697: Cat
Appendix A Catalyst 3550 Switch Boot Loader Commands Use the cat boot loader command to display the contents of one or more files. cat filesystem:/file-url ... Syntax Description filesystem: Alias for a flash file system. Use flash: for the system board flash device.
Page 698: Copy
Appendix A Catalyst 3550 Switch Boot Loader Commands copy copy Use the copy boot loader command to copy a file from a source to a destination. copy [-b block-size] filesystem:/source-file-url filesystem:/destination-file-url Syntax Description -b block-size (Optional) This option is used only for internal development and testing.
Page 699 Appendix A Catalyst 3550 Switch Boot Loader Commands delete delete Use the delete boot loader command to delete one or more files from the specified file system. delete filesystem:/file-url ... Syntax Description filesystem: Alias for a flash file system. Use flash: for the system board flash device.
Page 700: Dir
Appendix A Catalyst 3550 Switch Boot Loader Commands Use the dir boot loader command to display a list of files and directories on the specified file system. dir filesystem:/file-url ... Syntax Description filesystem: Alias for a flash file system. Use flash: for the system board flash device.
Page 701 Appendix A Catalyst 3550 Switch Boot Loader Commands Table A-1 dir Field Descriptions Field Description 1644045 Size of the file. <date> Last modification date. env_vars Filename. Related Commands Command Description mkdir Creates one or more directories. rmdir Removes one or more directories.
Page 702: Flash_Init
Appendix A Catalyst 3550 Switch Boot Loader Commands flash_init flash_init Use the flash_init boot loader command to initialize the flash file system. flash_init Syntax Description This command has no arguments or keywords. Defaults The flash file system is automatically initialized during normal system operation.
Page 703: Format
Appendix A Catalyst 3550 Switch Boot Loader Commands format format Use the format boot loader command to format the specified file system and destroy all data in that file system. format filesystem: Syntax Description filesystem: Alias for a flash file system. Use flash: for the system board flash device.
Page 704: Fsck
Appendix A Catalyst 3550 Switch Boot Loader Commands fsck fsck Use the fsck boot loader command to check the file system for consistency. fsck [-test | -f] filesystem: Syntax Description -test (Optional) Initialize the file system code and perform extra POST on flash memory.
Page 705: Help
Appendix A Catalyst 3550 Switch Boot Loader Commands help help Use the help boot loader command to display the available commands. help Syntax Description This command has no arguments or keywords. Command Modes Boot loader Command History Release Modification 12.1(4)EA1 This command was introduced.
Page 706: Load_Helper
Appendix A Catalyst 3550 Switch Boot Loader Commands load_helper load_helper Use the load_helper boot loader command to load and initialize one or more helper images, which extend or patch the functionality of the boot loader. load_helper filesystem:/file-url ... Syntax Description filesystem: Alias for a flash file system.
Page 707: Memory
Appendix A Catalyst 3550 Switch Boot Loader Commands memory memory Use the memory boot loader command to display memory heap utilization information. memory Syntax Description This command has no arguments or keywords. Command Modes Boot loader Command History Release Modification 12.1(4)EA1...
Page 708 Appendix A Catalyst 3550 Switch Boot Loader Commands memory Table A-2 memory Field Descriptions (continued) Field Description Stack Beginning and ending address of the area in memory allocated to the software to store automatic variables, return addresses, and so forth.
Page 709: Mkdir
Appendix A Catalyst 3550 Switch Boot Loader Commands mkdir mkdir Use the mkdir boot loader command to create one or more new directories on the specified file system. mkdir filesystem:/directory-url ... Syntax Description filesystem: Alias for a flash file system. Use flash: for the system board flash device.
Page 710: More
Appendix A Catalyst 3550 Switch Boot Loader Commands more more Use the more boot loader command to display the contents of one or more files. more filesystem:/file-url ... Syntax Description filesystem: Alias for a flash file system. Use flash: for the system board flash device.
Page 711: Rename
Appendix A Catalyst 3550 Switch Boot Loader Commands rename rename Use the rename boot loader command to rename a file. rename filesystem:/source-file-url filesystem:/destination-file-url Syntax Description filesystem: Alias for a flash file system. Use flash: for the system board flash device.
Page 712: Reset
Appendix A Catalyst 3550 Switch Boot Loader Commands reset reset Use the reset boot loader command to perform a hard reset on the system. A hard reset is similar to power-cycling the switch, clearing the processor, registers, and memory. reset Syntax Description This command has no arguments or keywords.
Page 713: Rmdir
Appendix A Catalyst 3550 Switch Boot Loader Commands rmdir rmdir Use the rmdir boot loader command to remove one or more empty directories from the specified file system. rmdir filesystem:/directory-url ... Syntax Description filesystem: Alias for a flash file system. Use flash: for the system board flash device.
Page 714: Set
The range is 4096 to 524288 bytes. BAUD rate—The rate in bits per second (bps) used for the console. The Cisco IOS software inherits the baud rate setting from the boot loader and continues to use this value unless the configuration file specifies another setting.
Page 715 This variable is used only for internal development and testing. HELPER_CONFIG_FILE filesystem:/file-url—The name of the configuration file to be used by the Cisco IOS helper image. If this is not set, the file specified by the CONFIG_FILE environment variable is used by all versions of Cisco IOS that are loaded, including the helper image.
Page 716: Unset
Appendix A Catalyst 3550 Switch Boot Loader Commands The BOOT environment variable can also be set by using the boot system filesystem:/file-url global configuration command. The ENABLE_BREAK environment variable can also be set by using the boot enable-break global configuration command.
Page 717: Type
Appendix A Catalyst 3550 Switch Boot Loader Commands type type Use the type boot loader command to display the contents of one or more files. type filesystem:/file-url ... Syntax Description filesystem: Alias for a flash file system. Use flash: for the system board flash device.
Page 718 HELPER_CONFIG_FILE—Resets the name of the configuration file to be used by the Cisco IOS helper image. If this is not set, the file specified by the CONFIG_FILE environment variable is used by all versions of Cisco IOS that are loaded, including the helper image. This variable is used only for internal development and testing.
Page 719 Appendix A Catalyst 3550 Switch Boot Loader Commands unset Command History Release Modification 12.1(4)EA1 This command was introduced. Usage Guidelines Under normal circumstances, it is not necessary to alter the setting of the environment variables. The MANUAL_BOOT environment variable can also be reset by using the no boot manual global configuration command.
Page 720: Version
Appendix A Catalyst 3550 Switch Boot Loader Commands version version Use the version boot loader command to display the boot loader version. version Syntax Description This command has no arguments or keywords. Command Modes Boot loader Command History Release Modification 12.1(4)EA1...
Page 721: Appendix
For this reason, use the debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. It is best to use the debug commands during periods of lower network traffic and fewer users. Debugging during these periods decreases the likelihood that increased debug command processing overhead will affect system use.
Page 722: Appendix B Catalyst 3550 Switch Debug Command
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 723: Debug Auto Qos
4d22h:mls qos min-reserve 8 34 4d22h:mls qos 4d22h:interface FastEthernet0/1 4d22h: mls qos trust cos 4d22h: wrr-queue bandwidth 10 20 70 1 4d22h: wrr-queue min-reserve 1 5 4d22h: wrr-queue min-reserve 2 6 4d22h: wrr-queue min-reserve 3 7 Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 724 Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management >...
Page 725: Debug Backup
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 726: Debug Cluster
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 727 Command Description show cluster candidates Displays a list of candidate switches when entered on the command switch. show cluster members Displays information about cluster members when executed on the command switch. Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 728: Debug Cpu-Interface
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.ystem Management Commands >...
Page 729: Debug Dot1X
The authsm, backend, besm, core, and reauthsm keywords were removed. The errors, events, packets registry, and state-machine keywords were added. 12.2(25)SEE The feature keyword was added. Usage Guidelines The undebug dot1x command is the same as the no debug dot1x command. Catalyst 3550 Multilayer Switch Command Reference OL-8566-02...
Page 730 Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 731: Debug Eap
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, see the Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management >...
Page 732: Debug Etherchannel
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 733: Debug Ethernet-Controller Ram-Access
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 734: Debug Fallback-Bridging
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 735: Debug Gigastack
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 736: Debug Ilpower Controller
Use the debug ilpower controller privileged EXEC command to enable debugging of the platform-specific Power over Ethernet (PoE) software module on the Catalyst 3550-24PWR switch in long message format. These messages include the Power Controller register reading. Use the no form of this command to disable debugging.
Page 737: Debug Ilpower Event
Use the debug ilpower event privileged EXEC command to enable debugging of the platform-specific Power over Ethernet (PoE) software module on the Catalyst 3550-24PWR switch in a short message format. These messages display the PoE state and events received. Use the no form of this command to disable debugging.
Page 738: Debug Ip Dhcp Snooping
The undebug ip dhcp snooping command is the same as the no ip debug dhcp snooping command. Related Commands Command Description show ip dhcp snooping Displays the DHCP snooping configuration. show ip dhcp snooping binding Displays the DHCP snooping binding information. Catalyst 3550 Multilayer Switch Command Reference B-18 OL-8566-02...
Page 739: Debug Ip Igmp Filter
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 740: Debug Ip Igmp Max-Groups
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 741: Debug Ip Verify Source Packet
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 742: Debug L3Multicast
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 743: Debug L3Tcam
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 744: Debug L3Unicast
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 745: Debug Mac-Manager
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 746: Debug Mac-Notification
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 747: Debug Met
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 748: Debug Mvrdbg
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 749: Debug Pagp
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 750: Debug Pbr
Defaults Debugging is disabled. Command Modes Privileged EXEC Command History Release Modification 12.1(13)EA1 This command was introduced. Usage Guidelines The undebug pbr command is the same as the no debug pbr command. Catalyst 3550 Multilayer Switch Command Reference B-30 OL-8566-02...
Page 751: Debug Platform Ip Arp Inspection
Displays the dynamic ARP inspection configuration and operating state. show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management >...
Page 752: Debug Pm
Defaults Debugging is disabled. Command Modes Privileged EXEC Command History Release Modification 12.1(4)EA1 This command was introduced. Usage Guidelines The undebug pm command is the same as the no debug pm command. Catalyst 3550 Multilayer Switch Command Reference B-32 OL-8566-02...
Page 753 Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 754: Debug Port-Security
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 755: Debug Span-Session
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 756: Debug Spanning-Tree
Display the spanning-tree synchronization event debug messages. uplinkfast Display UplinkFast-event debug messages. Defaults Debugging is disabled. Command Modes Privileged EXEC Command History Release Modification 12.1(4)EA1 This command was introduced. 12.1(9)EA1 The mstp and csuf/csrt keywords were added. Catalyst 3550 Multilayer Switch Command Reference B-36 OL-8566-02...
Page 757 Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 758: Debug Spanning-Tree Backbonefast
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 759: Debug Spanning-Tree Bpdu
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 760: Debug Spanning-Tree Bpdu-Opt
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 761: Debug Spanning-Tree Mstp
Display topology change notification event debug messages. timers Display debug messages for the MSTP timers for start, stop, and expire events. Defaults Debugging is disabled. Command Modes Privileged EXEC Command History Release Modification 12.1(9)EA1 This command was introduced. Catalyst 3550 Multilayer Switch Command Reference B-41 OL-8566-02...
Page 762 Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 763: Debug Spanning-Tree Switch
Command History Release Modification 12.1(4)EA1 This command was introduced. 12.1(9)EA1 The helper keyword was added. Usage Guidelines The undebug spanning-tree switch command is the same as the no debug spanning-tree switch command. Catalyst 3550 Multilayer Switch Command Reference B-43 OL-8566-02...
Page 764 Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 765: Debug Spanning-Tree Uplinkfast
Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 766: Debug Sw-Vlan
• (CLI) is in config-vlan mode. events Display VLAN manager event debug messages. Display VLAN manager Cisco IOS file system (IFS) error test debug messages. management Display VLAN manager management of internal VLAN debug messages. notification Display VLAN manager notification debug messages.
Page 767 Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 768: Debug Sw-Vlan Ifs
Use the debug sw-vlan ifs privileged EXEC command to enable VLAN manager Cisco IOS file system (IFS) error tests. Use the no form of this command to disable debugging. debug sw-vlan ifs {open {read | write} | read {1 | 2 | 3 | 4} | write}...
Page 769: Debug Sw-Vlan Notification
Debugging is disabled. Command Modes Privileged EXEC Command History Release Modification 12.1(4)EA1 This command was introduced. Usage Guidelines The undebug sw-vlan notification command is the same as the no debug sw-vlan notification command. Catalyst 3550 Multilayer Switch Command Reference B-49 OL-8566-02...
Page 770 Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 771: Debug Sw-Vlan Vtp
VTP code. packets Display debug messages for the contents of all incoming VTP packets that have been passed into the VTP code from the Cisco IOS VTP platform-dependent layer, except for pruning packets. pruning [packets | xmit] Display debug messages generated by the pruning segment of the VTP code.
Page 772 Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 773: Debug Udld B
[TLVs]) as they are examined by the packet reception code • Packet transmission attempts and the outcome For debug udld registries, these categories of debugging messages appear: • Subblock creation • Fiber-optic port status changes Catalyst 3550 Multilayer Switch Command Reference B-53 OL-8566-02...
Page 774 Description show debugging Displays information about the types of debugging that are enabled. For syntax information, select Cisco IOS Release 12.2 Configuration Guides and Command References > Cisco IOS Configuration Fundamentals Configuration Guide, Release 12.2 > System Management > Troubleshooting and Fault Management.
Page 775 2-28 access ports 2-583 booting ACEs 2-74, 2-277 Cisco IOS image 2-31 ACLs displaying environment variables 2-320 deny 2-72 interrupting 2-26 displaying 2-314 manually 2-29 for non-IP protocols 2-215 Catalyst 3550 Multilayer Switch Command Reference IN-1 OL-8566-02...
Page 776 2-31 cluster member command 2-62 BPDU filtering, for spanning tree 2-520, 2-553 cluster outside-interface command 2-64 BPDU guard, for spanning tree 2-522, 2-553 cluster run command 2-65 broadcast storm control 2-567 Catalyst 3550 Multilayer Switch Command Reference IN-2 OL-8566-02...
Page 777 Layer 2 protocol packets 2-205 debug platform ip arp inspection command B-31 defining in a policy map 2-247 debug pm command B-32 overriding the incoming value 2-245 debug port-security command B-34 Catalyst 3550 Multilayer Switch Command Reference IN-3 OL-8566-02...
Page 778 2-152 2-109 bindings dynamic-access ports adding configuring 2-150 2-574 deleting restrictions 2-150 2-574 clearing database agent statistics 2-44 database agent, configuring 2-152 displaying database agent status 2-389, 2-391 Catalyst 3550 Multilayer Switch Command Reference IN-4 OL-8566-02...
Page 779 2-271 See DHCP snooping priority of interface for transmitted traffic 2-273 Dynamic Trunking Protocol Ethernet controller See DTP debug messages, display B-13 internal register display 2-331 Ethernet statistics, collecting 2-297 Catalyst 3550 Multilayer Switch Command Reference IN-5 OL-8566-02...
Page 780 2-366 applying 2-168 frame forwarding information, displaying 2-366 debug messages, display B-19 fsck (boot loader) command IGMP groups A-10 configuring throttling action 2-170 setting maximum 2-170 IGMP maximum groups, debugging B-20 Catalyst 3550 Multilayer Switch Command Reference IN-6 OL-8566-02...
Page 781 2-166 restarting 2-504 ip igmp filter command 2-168 interface speed, configuring 2-565 ip igmp max-groups command 2-170 internal registers, displaying 2-331, 2-337 ip igmp profile command 2-172 Catalyst 3550 Multilayer Switch Command Reference IN-7 OL-8566-02...
Page 782 MAC access list configuration mode 2-215 mac access-list extended command 2-215 MAC access lists 2-72 MAC addresses l2protocol-tunnel command 2-202 debug learning on bridge groups B-14 l2protocol-tunnel cos command 2-205 debug learning on VLANs B-25 Catalyst 3550 Multilayer Switch Command Reference IN-8 OL-8566-02...
Page 783 2-231 macros monitor session command 2-261 adding a description more (boot loader) command 2-226 A-16 adding a global description 2-230 MSTP applying displaying 2-227 2-472 creating interoperability 2-231 2-54 Catalyst 3550 Multilayer Switch Command Reference IN-9 OL-8566-02...
Page 784 (interface configuration) command 2-268 enabling BPDU guard 2-522, 2-553 mvr group command 2-266 enabling Port Fast 2-553, 2-555 mvr vlan group command 2-269 forward-delay time 2-541 length of listening and learning states 2-541 Catalyst 3550 Multilayer Switch Command Reference IN-10 OL-8566-02...
Page 785 B-16, B-17 2-106 displaying status re-authenticating IEEE 802.1x-enabled ports 2-464 2-103 enabling 2-289 resetting configurable IEEE 802.1x parameters 2-89 police aggregate command statistics and status display 2-282 2-342 Catalyst 3550 Multilayer Switch Command Reference IN-11 OL-8566-02...
Page 786 CoS-to-egress-queue map 2-658 displaying buffer settings 2-440 displaying queueing strategies 2-440 enabling the expedite 2-291 mapping DSCPs to thresholds 2-660 minimum-reserve level 2-662 minimum-reserve level buffer sizes 2-255 ratio of queue sizes 2-663 Catalyst 3550 Multilayer Switch Command Reference IN-12 OL-8566-02...
Page 787 2-302 receiving flow-control packets service-policy command 2-117 2-305 recovery mechanism set (boot loader) command A-20 causes 2-113 set command 2-307 display setup command 2-351 2-309 timer interval setup express command 2-113 2-312 Catalyst 3550 Multilayer Switch Command Reference IN-13 OL-8566-02...
Page 788 2-389, 2-391 show setup express command 2-470 show ip igmp profile command show spanning-tree command 2-394 2-471 show ip igmp snooping command show storm-control command 2-395 2-477 Catalyst 3550 Multilayer Switch Command Reference IN-14 OL-8566-02...
Page 789 MAC address notification feature 2-218 enabling the sending of 2-507 setting DSCP or precedence of 2-515 software images deleting 2-71 downloading 2-10 upgrading 2-10 uploading 2-16 software version, displaying 2-490 source ports, MVR 2-268 Catalyst 3550 Multilayer Switch Command Reference IN-15 OL-8566-02...
Page 790 2-562 spanning-tree stack-port command 2-557 interval between hello BPDU messages 2-562 spanning-tree transmit hold-count command 2-559 max-age 2-562 spanning-tree uplinkfast command 2-560 port priority for selection of 2-551 spanning-tree vlan command 2-562 Catalyst 3550 Multilayer Switch Command Reference IN-16 OL-8566-02...
Page 791 2-598 switchport priority extend command 2-595 encapsulation methods 2-598 switchport protected command 2-597 native VLANs 2-598 switchports, displaying 2-371 on GigaStack GBICs 2-584 switchport trunk command 2-598 pruning-eligible VLAN list 2-600 Catalyst 3550 Multilayer Switch Command Reference IN-17 OL-8566-02...
Page 792 VLAN Query Protocol from a server 2-10 See VQP monitoring status of 2-316 VLANs UplinkFast, for STP 2-560 adding 2-619 user EXEC mode 1-2, 1-3 configuring 2-619, 2-625 debug message display Catalyst 3550 Multilayer Switch Command Reference IN-18 OL-8566-02...
Page 793 DSCPs to thresholds 2-660 WRR, assigning weights to egress queues 2-656 and dynamic-access ports 2-574 wrr-queue bandwidth command 2-656 clearing client statistics 2-55 wrr-queue cos-map command 2-658 displaying information 2-498 wrr-queue dscp-map command 2-660 Catalyst 3550 Multilayer Switch Command Reference IN-19 OL-8566-02...
Page 794 Index wrr-queue min-reserve command 2-662 wrr-queue queue-limit command 2-663 wrr-queue random-detect max-threshold command 2-665 wrr-queue threshold command 2-667 Catalyst 3550 Multilayer Switch Command Reference IN-20 OL-8566-02...

Cisco Catalyst 3550 Command Reference Manual

Table of Contents

CHAPTER 1 Using the Command-Line Interface

Chapter 2 Catalyst 3550 Switch Cisco IO Command

Show Etherchannel

Appendix

Appendix

Appendix B Catalyst 3550 Switch Debug Command

Quick Links

Chapters

Related Manuals for Cisco Catalyst 3550

Summary of Contents for Cisco Catalyst 3550