3Com 3800 User Manual

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Part No. DUA1691-0AAA01

100004-00 Rev. 01

Published April 1998

SuperStack

Switch 3800

User Guide

Table of Contents

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Summary of Contents for 3Com 3800

Page 1: User Guide
SuperStack ® Switch 3800 User Guide http://www.3com.com/ Part No. DUA1691-0AAA01 100004-00 Rev. 01 Published April 1998 ®...
Page 2 3Com Technologies reserves the right to revise this documentation and to make changes in content from 95052-8145 time to time without obligation on the part of 3Com Technologies to provide notiﬁcation of such revision or change. 3Com Technologies provides this documentation without warranty of any kind, either implied or expressed, including, but not limited to, the implied warranties of merchantability and ﬁtness for a particular purpose.
Page 3: Vcci Statement
VCCI Statement Information To The User If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient the receiving antenna.
Page 5: Table Of Contents
Finding Information in This Guide Conventions Command Syntax Symbols Line-Editing Commands Related Publications 3800 O WITCH VERVIEW About the Switch 3800 Summary of Features Port Connections Full-duplex Port Redundancy Load Sharing Switch Operation Virtual LANs (VLANs) Priority Access Control Enabled (PACE)
Page 6 Installing the Switch 3800 Connecting Equipment to the Console Port Powering-up the Switch Checking the Installation Logging on for the First Time Security Access Levels Methods of Managing the Switch 3800 Using Telnet Using SNMP ETUP Conﬁguration Rules for Ethernet Rack Mounting...
Page 7 Syntax Helper Command Completion Abbreviated Syntax Command Shortcuts Numerical Ranges Names Symbols Line-Editing Commands Command History Substitution Common Commands Switch 3800 Commands General Switch Commands User Account Commands Switch Management Commands VLAN Commands 4-10 Protocol Commands FDB Commands 4-11 3-10...
Page 8 Overview of Virtual LANs Conﬁguring VLANs on the Switch 3800 Displaying VLAN Settings Deleting and Resetting VLANs WITCH Overview of the FDB viii Port Commands 4-12 PACE Commands 4-13 STP Commands 4-14 Basic IP Commands 4-16 IP ARP Commands 4-17...
Page 9 How STP Works Initialization Stabilization Reconﬁguration Spanning Tree Domains Defaults STP Conﬁgurations STP Conﬁgurations to Avoid Creating STP Domains Enabling STP on the Switch Conﬁguring STP 7-10 Conﬁguration Example Displaying STP Settings Disabling and Resetting STP IP U NICAST OUTING...
Page 10 Beneﬁts of RMON 9-13 Improving Efﬁciency 9-13 Allowing Proactive Management Reducing the Trafﬁc Load RMON and the Switch 9-14 RMON Features of the Switch About Event Actions 9-15 PGRADE AND 10-1 Rebooting the Switch 10-2 Returning to Factory Defaults 10-3...
Page 11 Using the Command-Line Interface VLANs Routing ECHNICAL UPPORT Online Technical Services World Wide Web Site 3Com Bulletin Board Service Access by Analog Modem Access by Digital Modem 3ComFactsSM Automated Fax Service 3ComForum on CompuServe Support from Your Network Supplier Support from 3Com...
Page 12 LOSSARY NDEX ORPORATION IMITED ARRANTY...
Page 13: About This Guide
Release Notes if it is different from the information given in this guide. Terminology Throughout this guide, the term Switch 3800 is used to refer to the SuperStack II Switch 3800. For deﬁnitions of other terms used in this guide, refer to the “Glossary,”...
Page 14: Finding Information In This Guide
Upgrading the Switch software Chapter 10, “Software Upgrade and Boot Technical Specifications Troubleshooting Getting technical support Identifying terms Location Chapter 1, “Switch 3800 Overview” Chapter 2, “Installation and Setup” Appendix A, “Safety Information” Chapter 3, “Accessing The Switch” Chapter 4, “Commands” Chapter 5, “Virtual LANs (VLANs)”...
Page 15: Conventions
Conventions Table 1 and Table 2 list conventions that are used throughout this guide. Table 1 Notice Icons Icon Table 2 Text Conventions Convention Screen displays This typeface represents information as it appears on the The words “enter” and “type” [Key] names Words in italicized type...
Page 16: Command Syntax Symbols
BOUT UIDE Command Syntax You may see a variety of symbols shown as part of the command Symbols syntax. These symbols explain how to enter the command, and you do not type them as part of the command itself. Table 3 summarizes command syntax symbols.
Page 17: Line-Editing Commands
The command syntax is explained in Chapter 4. Related The Switch 3800 documentation set includes the following: Publications 3Com’s home page can be found at the following web site: SuperStack II Switch 3800 Quick Reference Guide. Part Number DQA1691-OAAA01. SuperStack II Switch 3800 Quick Installation Guide.
Page 18 BOUT UIDE...
Page 19: Switch 3800 Overview
The Switch 3800 has the following features: Features 3800 O WITCH Switch 3800 features How to use the Switch 3800 in your network conﬁguration Switch 3800 front view Switch 3800 rear view Factory default settings ® 24 autosensing 10BASE-T/100BASE-TX ports, one Gigabit Ethernet...
Page 20 3800 O HAPTER WITCH VERVIEW Virtual LANs (VLANs) Support for 64 VLANs on a single Switch 3800 Support for IEEE 802.1Q tagging Controls trafﬁc (including broadcasts) Provides extra security Protocol-sensitive ﬁltering for VLANs Recognition of the Priority Access Control Enabled (PACE) bit set by ®...
Page 21: Port Connections
(such as 3C16911) inserted to make use of these ports. You can connect other Gigabit Ethernet devices (such as 10/100 Switches that have Gigabit Ethernet modules) to the Switch 3800. You can also connect Switch 3800 devices to each other.
Page 22: Load Sharing
ﬁltering, forwarding, and learning packets. Virtual LANs (VLANs) The Switch 3800 has a Virtual LAN (VLAN) feature that allows you to build your network segments without being restricted by physical connections. A VLAN is a group of location- and topology-independent devices that communicate as if they are on the same physical Local Area Network (LAN).
Page 23: Priority Access Control Enabled (Pace)
Network This section describes where to position the Switch 3800 within your Conﬁguration network. One common use of the Switch 3800 is on a Gigabit Ethernet Example backbone. Figure 1-2 shows an example of a Gigabit Ethernet backbone within a building.
Page 24 The Switch 1100 on each ﬂoor has a 100Mbps full-duplex link to the Switch 3800. A Switch 3300 is connected to a group of servers on one ﬂoor of the building. The Switch 3800 routes IP trafﬁc between the IP subnets on each ﬂoor, and also provides bridged connectivity for non-IP...
Page 25: Switch 3800 Front View
Gigabit Ethernet port using standard Gigabit Interface Connectors (GBICs). You must have a GBIC transceiver module inserted to make use of these ports. The Switch 3800 ports support the media types and distances listed in Table 1-1. 10/100 Mbps ports...
Page 26: Leds
For more information on 1000BASE-SX and 1000BASE-LX characteristics refer to IEEE Draft P802.3z/D4.2 Tables 38-2 and 38-6. LEDs Table 1-2 describes the LED behavior on the Switch 3800. Table 1-2 Switch 3800 LEDs 10/100Mbps Port Status LEDs Gigabit Ethernet Port Status LEDs...
Page 27: Switch 3800 Rear View
The rear panel has the following features: Power Socket The Switch 3800 automatically adjusts to the supply voltage. The power supply operates down to 90 V. The fuse is suitable for both 110 V AC and 220-240 V AC operation.
Page 28: Mac Address
The console port (9-pin, “D” type connector) is used to connect a terminal and to carry out local out-of-band management. Factory Defaults Table 1-3 shows the factory defaults for the Switch 3800 features. Table 1-3 Switch 3800 Factory Defaults Item...
Page 29: Installation And Setup
Appendix A of this guide. Determining the The Switch 3800 is suited for use in the ofﬁce, where it can be Switch 3800 free-standing or mounted in a standard 19-inch equipment rack.
Page 30: Conﬁguration Rules For Ethernet
Rack Mounting The Switch 3800 is 2U high and will ﬁt in most standard 19-inch racks. CAUTION: The Switch should only be used in a rack if it is mounted on runners, a shelf, or a tray to support the weight. The rack mount kits alone are not sufﬁcient to support the weight of the Switch.
Page 31: Free-Standing
7 Connect cables. Free-Standing The Switch 3800 is supplied with four self-adhesive rubber pads. Apply the pads to the underside of the device by sticking a pad in the marked area at each corner of the Switch. Installing the Switch 3800...
Page 32: Stacking The Switch And Other Devices
Stacking the Switch Up to four units can be placed on top of one another. If mixing Switch and Other Devices 3800, Switch 3000 FX, Switch 1000, Switch 1200, and other SuperStack using rubber pads. This section relates only to physically placing the devices on top of each other.
Page 33 Connecting Equipment to the Console Port Figure 2-2 shows the pin-outs for a 9-pin to RS-232 25-pin null modem cable. Switch 3800 Cable connector: 9-pin female Screen Shell Ground Figure 2-2 Null modem cable pin-outs Figure 2-3 shows the pin-outs for a 9-pin to 9-pin PC-AT serial null modem cable.
Page 34: Powering-Up The Switch
2 Connect the power cable to the wall outlet. 3 If necessary, turn the on/off switch to the on position. Checking the After turning on power to the Switch 3800, the device performs a Installation Power On Self-Test (POST). Power On Self-Test...
Page 35 6 Save your conﬁguration changes so that they will be in effect after the next Switch reboot, by typing save For more information on saving conﬁguration changes, refer to Chapter 10. 7 When you are ﬁnished using the facility, log out of the Switch by typing logout Logging on for the First Time...
Page 36 2: I HAPTER NSTALLATION AND ETUP...
Page 37: Accessing The Switch
SAVE command after you have made the change. For more information on the SAVE command, refer to Chapter 10. Security Access The Switch 3800 supports two security access levels: Levels User Access Level A user-level account can view all manageable parameters, with the...
Page 38: Administrator Access Level
If an asterisk (*) appears in front of the command-line prompt, it indicates that you have outstanding conﬁguration changes that have not been saved. For example: *3C16910# Default Accounts By default, the Switch is conﬁgured with two accounts, as shown in Table 3-1. Table 3-1 Default Accounts User Name admin user The default accounts do not have passwords assigned to them.
Page 39: Creating A Management Account
5 Re-enter the new password at the prompt. 6 Save your changes by typing save Creating a The Switch can have a total of three management accounts. You can Management use the default names (admin and user), or you can create new names Account and passwords for the accounts.
Page 40: Viewing Switch Accounts
To delete a switch account, you must have administrator privileges. Use the following command to delete an account: delete account <username> Methods of You can manage the Switch 3800 using the following methods: Managing the Switch 3800 The Switch can support up to four user sessions concurrently (for example, one console port and three Telnet connections).
Page 41: Using The Console Interface
Once the connection is established, you will see the system prompt and you may log on. Conﬁguring Switch IP In order to manage the Switch by way of a Telnet connection or by Parameters using an SNMP Network Manager, you must conﬁgure the Switch IP parameters.
Page 42: Manually Conﬁguring The Ip Settings
VLAN on the Switch, and it must be assigned an IP address and subnetwork mask. IP addresses are always assigned to a VLAN. The Switch 3800 can be assigned multiple IP addresses. For information on creating and conﬁguring VLANs, refer to Chapter 5, “Virtual LANs (VLANs).”...
Page 43: Disconnecting A Telnet Session
Switch reboot, by typing save For more information on saving conﬁguration changes, refer to Chapter 10. 8 When you have finished using the facility, log out of the Switch by typing logout Disconnecting a For security purposes, an administrator access level account can...
Page 44: Disabling Telnet Access
============================================================ Terminate the session by typing clear session <session_number> Disabling Telnet By default, Telnet services are enabled on the Switch. You can choose Access to disable Telnet. To do so, enter disable telnet To re-enable Telnet on the Switch, at the console port enter enable telnet You must be logged on as an administrator to enable or disable Telnet.
Page 45: Accessing Switch Agents
Switch reboot. You can save your changes by using the SNMP save attribute, or by issuing the interface. Supported MIBs In addition to private MIBs, the Switch 3800 supports the standard MIBs listed in Table 3-2. Table 3-2 Supported MIBs Description...
Page 46: Conﬁguring Snmp Settings
The Switch sends SNMP traps to the trap receiver. You can have a maximum of six trap receivers conﬁgured for each Switch 3800. Community strings — The community strings allow a simple method of authentication between the Switch and the remote Network Manager.
Page 47 Allows you to configure the name of the Switch. The sysname appears in the command line interface prompt. A maximum of 32 characters is allowed. The default sysname is 3C16910. Allows you to configure the location of the Switch. A maximum of 32 characters is allowed. 3-11...
Page 48: Displaying Snmp Settings
3-12 3: A HAPTER CCESSING Displaying SNMP To display the SNMP settings conﬁgured on the Switch 3800, use the Settings following command: show management This command displays the following information: Resetting and To reset or disable SNMP settings, use the commands in Table 3-5.
Page 49: Traceroute
<ip_address> where ip_address is the IP address of the destination endstation. Conﬁguring Ports Ports on the Switch 3800 can be conﬁgured in the following ways: Enabling and By default, all ports are enabled. To enable or disable one or more...
Page 50: Conﬁguring Autonegotiation
3: A HAPTER CCESSING Conﬁguring By default, the Switch 3800 is conﬁgured to use autonegotiation for all Autonegotiation ports. Autonegotiation on 10/100 Mbps ports is used to automatically determine speed and duplex settings. You can select to manually conﬁgure the duplex and speed settings of 10/100 Mbps ports. Manual conﬁguration would be used when the remote device does not support...
Page 51: Load Sharing
This feature is supported between Switch 3800 Switches only, but may be compatible with third-party trunking or sharing algorithms. Conﬁguring Load To set up the Switch 3800 to load share among ports, you must create Sharing a load-sharing group of ports. Load-sharing groups are deﬁned...
Page 52: Verifying The Load Sharing Conﬁguration
3-16 3: A HAPTER CCESSING Table 3-7 Port Combinations for the Switch 3800 Load-sharing Group 4-port groups 2-port groups When you deﬁne a load-sharing group, you assign a group of ports to a single, logical port number. To enable or disable a load-sharing group, use the following commands: enable sharing <master_port>...
Page 53: Smartredundancy
SmartRedundancy SmartRedundancy for the Switch 3800 refers to fail-over behavior of the main and standby Gigabit Ethernet ports. SmartRedundancy allows the Switch to always use the main link if it is available. For example, if only the standby link is available it will be used, but if the main link becomes available again the link will switch back to the main from the standby.
Page 54 <portlist> util WITCH Description Allows you to disable the SmartRedundancy feature. If the feature is disabled, the Switch changes the active link only when the current active link becomes inoperable. Displays state, link status, speed, and autonegotiation setting for each port.
Page 55: Commands
This chapter contains a description of each command-line interface command for the Switch 3800. It also provides the following information related to Switch 3800 commands: If an asterisk (*) appears in front of the command-line prompt, it indicates that you have outstanding conﬁguration changes that have not been saved.
Page 56: Syntax Helper
The syntax helper also provides assistance if you have entered an incorrect command. Command The Switch provides command completion by way of the [Tab] key. If Completion you enter a partial command, pressing the [Tab] key ﬁlls in the remainder of the command. If command options exist, they are displayed.
Page 57: Numerical Ranges
You can add additional port numbers to the list, separated by a comma: port 1-3,6,8 Names All named components of the Switch conﬁguration must have a unique name. Names must begin with an alphabetical character delimited by white space, unless enclosed in quotation marks. Symbols You may see a variety of symbols shown as part of the command syntax.
Page 58: Line-Editing Commands
4: C HAPTER OMMANDS Table 4-1 Command Syntax Symbols (continued) Symbol Description vertical bar | Separates mutually exclusive items in a list, one of which must be entered. For example, in the syntax config snmp community [read | write] <string> you must specify either the read or write community string in the command.
Page 59: Command History Substitution
Command History The Switch 3800 “remembers” the last 50 commands you enter. You Substitution can display a list of these commands by typing history Common Table 4-3 describes common commands used to manage the Switch. Commands Commands speciﬁc to a particular feature are described in the other chapters of this guide.
Page 60: Switch 3800 Commands
Switch 3800 The tables in this section list all of the commands used on the Switch Commands 3800. The commands are organized by the following categories: Description Allows you to reset all Switch parameters (with the exception of defined VLANs and IP addresses) to the factory defaults.
Page 61: General Switch Commands
Displays summary system configuration and memory utilization statistics for the CPU system DRAM. Allows you to reboot the Switch. The Switch will ask for confirmation and then reboot. Allows you to configure the system date and time. The format for <time> is: mm/dd/yyyy hh:mm The time uses a 24-hour clock format.
Page 62: User Account Commands
— Layer 2 bridging functions only iprouting — Bridging and IP unicast routing functions If this command is used while the Switch 3800 is up and running, the Switch saves the configuration and reboots. The default operating mode is “iprouting.”...
Page 63: Switch Management Commands
[<ipaddress> | all] config snmp community [read | readwrite] <string> (continued) Switch 3800 Commands Description Displays network management configuration and statistics including enable/disable states for Telnet and SNMP, SNMP community strings, authorized SNMP station list, SNMP trap receiver list, and login statistics.
Page 64: Vlan Commands
Allows you to configure the name of the system contact. A maximum of 32 characters is allowed. Allows you to configure the name of the Switch. The sysname appears in the command line interface prompt. A maximum of 32 characters is allowed. The default sysname is 3C16910.
Page 65: Protocol Commands
{all | <mac_address> | vlan <name> | <portlist> | permanent} clear fdb {all | <mac_address> | vlan <name> | <portlist> } (continued) Switch 3800 Commands Description Allows you to display protocol-related information, including: Protocol name List of protocol fields List of VLANs that use this protocol Allows you to create a user-defined protocol.
Page 66: Port Commands
4-12 4: C HAPTER OMMANDS Table 4-9 FDB Commands (continued) Command create fdbentry <mac_address> vlan <name> <portlist> delete fdbentry <mac_address> vlan <name> Allows you to delete a permanent FDB entry. config fdb agingtime <number> Port Commands Table 4-10 describes port commands. Table 4-10 Port Commands Command show port <portlist>...
Page 67: Pace Commands
Table 4-11 describes PACE commands. Table 4-11 PACE Commands Command enable pace disable pace Switch 3800 Commands Description Allows you to change the configuration of a group of 10/100 Mbps ports. Specify the following: auto off — The port will not autonegotiate the settings.
Page 68: Stp Commands
(Forward Delay –1). Allows you to specify the priority of the STPD. By changing the priority of the Switch, you can make it more or less likely to become the Root Bridge. The range is 0–65,535. The default setting is 32,768. A...
Page 69 [<stpd_name> | all] enable stpd port <portlist> disable stpd port <portlist> unconfig stpd {<stpd_name> | all} Switch 3800 Commands Description Allows you to specify the path cost of the port in this STPD. The range is 1–65,535. The Switch automatically assigns a default path cost of 1.
Page 70: Basic Ip Commands
4-16 4: C HAPTER OMMANDS Basic IP Commands Table 4-13 describes basic IP commands. Table 4-13 Basic IP Commands Command show ipconfig {vlan [<name> | all]} show ipstats {vlan [<name | all]} show ipfdb {<ipaddress> <netmask> | vlan <name> | all} clear ipfdb [<ipaddress>...
Page 71: Ip Arp Commands
[<ipaddress> | vlan <name> | all] config iparp add <ipaddress> <mac_address> config iparp delete <ipaddress> Switch 3800 Commands Description Allows you to disable the generation and processing of BOOTP packets. Allows you to enable the BOOTP relay function on the router.
Page 72: Ip Route Table Commands
4-18 4: C HAPTER OMMANDS IP Route Table Table 4-15 describes IP route table commands. Commands Table 4-15 IP Route Table Commands Command show iproute {vlan {<name> | all | permanent | <ipaddress> <netmask>} config iproute add default <gateway> {<metric>} config iproute delete default <gateway>...
Page 73 <mininterval> <maxinterval> <lifetime> <preference> unconfig icmp unconfig irdp disable irdp {vlan <name> | all} Switch 3800 Commands Description Allows you to enable the modification of route table information when an ICMP redirect message is received. The default setting is disabled.
Page 74: Rip Commands
4-20 4: C HAPTER OMMANDS RIP Commands Table 4-17 describes the commands used to conﬁgure the RIP protocol. Table 4-17 RIP Commands Command show rip {vlan <name> | all} enable rip disable rip config rip add {vlan <name> | all} config rip delete {vlan <name>...
Page 75 [none | v1only | v2only | any] {vlan <name> | all} unconfig rip {vlan <name> | all} Switch 3800 Commands Description Allows you to enable the advertisement of static routes using RIP. The default setting is enabled.
Page 76: Logging Commands
4-22 4: C HAPTER OMMANDS Logging Commands Table 4-18 describes Switch logging commands. Table 4-18 Logging Commands Command show log config show log {<priority>} {<subsystem>} clear log config log display {<priority>} {<subsystem>} (continued) Description Displays the log configuration, including the syslog...
Page 77: Conﬁguration And Image Commands
If not specified, the configuration is saved to the configuration area currently in use. Allows you to configure the Switch to use a particular configuration on the next reboot. Options include the primary configuration area, the secondary configuration area, or an imported ASCII file.
Page 78 4-24 4: C HAPTER OMMANDS Table 4-19 Conﬁguration and Image Commands (continued) Command download image <ipaddress> <filename> {primary | secondary} Description Allows you to download a new image from a TFTP server. You must specify the IP address of the TFTP server and the image filename.
Page 79: Virtual Lan S
Setting up Virtual Local Area Networks (VLANs) on the Switch 3800 eases many time-consuming tasks of network administration while increasing efﬁciency in network operations. This chapter describes the VLAN concepts and explains how to implement VLANs on the Switch 3800.
Page 80: Types Of Vlans
HAPTER IRTUAL Types of VLANs Switch 3800 VLANs can be created according to the following criteria: Port-Based VLANs In a port-based VLAN, a VLAN name is given to a group of one or more ports on the Switch. A Switch port can be a member of only one port-based VLAN.
Page 81 VLANs to communicate, the trafﬁc must go through the IP routing functionality provided in the Switch 3800. This means that each VLAN must be conﬁgured as a router interface with a unique IP address.
Page 82: Expanding Port-Based Vlans Across Switches
In a port-based VLAN, to create multiple VLANs that span two Switches, a port on Switch 1 must be cabled to a port on Switch 2 for each VLAN that you want to create. At least one port on each Switch must be a member of one of the VLANs, as well.
Page 83 Switch 1 and Switch 2 by way of a connection between Switch 1 port 11 and Switch 2 port 6. VLAN Engineering spans Switch 1 and Switch 2 by way of a connection between Switch 1 port 19 and Switch 2 port Accounting...
Page 84: Tagged Vlans
HAPTER IRTUAL Tagged VLANs The Switch 3800 uses the IEEE 802.1Q D4 draft standard for rules associated with VLAN tagging. Tagging is a process that inserts a marker (called a tag) into the Ethernet frame. The tag contains the identiﬁcation number of a speciﬁc VLAN, called the VLANid.
Page 85 Figure 5-4 illustrates the physical view of a network that uses tagged and untagged trafﬁc. Switch 1 802.1Q Tagged server Switch 2 Figure 5-4 Physical diagram of tagged and untagged trafﬁc Figure 5-5 shows a logical diagram of the same network.
Page 86: Mixing Port-Based And Tagged Vlans
Protocol-based VLANs enable you to deﬁne a protocol ﬁlter that the VLANs Switch 3800 uses as the matching criteria to determine if a particular packet belongs to a particular VLAN. Protocol-based VLANs are most often used in situations where network segments contain hosts running multiple protocols.
Page 87: Predeﬁned Protocol Filters
The IP trafﬁc has been divided into two IP subnets, 192.207.35.0 and 192.207.36.0. The subnets are internally routed by the Switch 3800. The subnets are assigned different VLAN names, Finance and Personnel, respectively. The remainder of the trafﬁc belongs to the VLAN named MyCompany.
Page 88: Deﬁning Protocol Filters
ﬁlters, can be deﬁned. VLAN Names The Switch 3800 supports up to 64 different VLANs. Each VLAN is given a name that can be up to 32 characters. VLAN names can use standard alpha-numeric characters. The following characters are not...
Page 89: The Default Vlan
The Default VLAN The Switch 3800 ships with one default VLAN that has the following properties: Conﬁguring VLANs This section describes the commands associated with setting up VLANs on the Switch 3800 on the Switch 3800. Conﬁguring a VLAN involves the following steps: 1 Create and name the VLAN.
Page 90: Vlan Conﬁguration Examples
1 to 4095. Allows you to configure an IEEE 802.1Q EtherType. Use this command if you have another Switch that supports 802.1Q, but uses a different EtherType. The default value used by the Switch is 8100.
Page 91: Displaying Vlan Settings
The following example creates a tag-based VLAN named video. It assigns the VLANid 1000. Ports 4–8 are added as tagged ports to the VLAN. create vlan video config video tag 1000 config video add port 4-8 tagged The following example creates a VLAN named Sales , with the VLANid 120.
Page 92: Protocol Information
5-14 5: V HAPTER IRTUAL Sample output from this command is as follows: 3C16910:7 # sh vlan all VLAN "Default" created by user VLAN "green" created by user To display protocol information, use the following command: show protocol {<protocol> | all} (VLAN Status for each port Enabled/disabled...
Page 93: Deleting And Resetting Vlans
Sample output from this command is as follows: show protocol all Protocol Name ----------------- netbios decnet This show command displays protocol information, including the following: Deleting and To delete a VLAN, or to return VLAN settings to their defaults, use the Resetting VLANs commands listed in Table 5-2.
Page 94 5-16 5: V (VLAN HAPTER IRTUAL...
Page 95: Switch Forwarding Database (Fdb)
(FDB), how the FDB works, and how to conﬁgure the FDB. Overview of the The Switch 3800 maintains a database of all addresses received on all of its ports. It uses the information in this database to decide whether a frame should be forwarded or ﬁltered.
Page 96: Pace Prioritization
WITCH ORWARDING PACE Prioritization For devices supporting PACE, the Switch 3800 can be conﬁgured to recognize PACE modiﬁed addresses. When present, the Switch assigns PACE trafﬁc to the high priority queue within the Switch. Recognition of PACE trafﬁc is controlled by the following commands:...
Page 97: Conﬁguring Fdb Entries
Conﬁguring FDB To conﬁgure entries in the FDB, use the commands listed in Table 6-1. Entries Table 6-1 FDB Conﬁguration Commands Command create fdbentry <mac_address> vlan <name> <portlist> config fdb agingtime <delay> FDB Conﬁguration This example adds a permanent entry to the FDB: Example create fdbentry 02:60:8c:12:34:56 vlan marketing port 4 The permanent entry has the following characteristics:...
Page 98: Removing Fdb Entries
6: S HAPTER WITCH ORWARDING The following sample output shows the information displayed when you request output for all FDB entries: show fdb Hash ------------------------------------------------------------ 0f00: 0 ff:ff:ff:ff:ff:ff 3289: 0 00:e0:2b:00:00:00 373d: 0 01:80:c2:00:00:00 72f3: 0 00:e0:2b:00:a4:00 Total: 4 Static: 4 Perm: 0 Dyn: 0 Dropped: 0 FDB Aging time: 300 The show command displays summary information, including Removing FDB...
Page 99: Tree Protocol
Using the Spanning Tree Protocol (STP) functionality of the Switch 3800 makes your network more fault tolerant. The following sections describe STP concepts, and how STP features are supported by the Switch. STP is a part of the 802.1d bridge speciﬁcation deﬁned by the IEEE Computer Society.
Page 100 7: S (STP) HAPTER PANNING ROTOCOL Figure 7-1 Network with an illegal topology This conﬁguration is illegal because it creates loops that cause the network to overload. However, STP allows you to use this conﬁguration because STP detects duplicate paths and immediately prevents (or blocks) one of them from forwarding trafﬁc.
Page 101: How Stp Works
If the link through Bridge C fails, as shown in Figure 7-3, the STP system reconﬁgures the network so that trafﬁc from segment 2 ﬂows through Bridge B. Figure 7-3 Trafﬁc ﬂowing through Bridge B How STP Works STP has the following three stages of operation: Initialization Stabilization Reconﬁguration...
Page 102: Stabilization
Root Bridge sends out an SNMP trap. Spanning Tree The Switch 3800 can be partitioned into multiple virtual bridges. Each Domains virtual bridge can run an independent spanning tree instance. Each spanning tree instance is called a Spanning Tree Domain (STPD). Each STPD has its own Root Bridge and active path.
Page 103: Defaults
Care must be taken to ensure that STPD instances within a single Switch do not see each other in the same broadcast domain. This could happen if, for example, another external bridge is used to connect VLANs belonging to separate STPDs.
Page 104: Stp Conﬁgurations
Manufacturing is deﬁned on Switch Y, Switch Z, and Switch M. Engineering is deﬁned on Switch Y, Switch Z, and Switch M. Marketing is deﬁned on all Switches (Switch A, Switch B, Switch Y, Switch Z, and Switch M). STPD1 contains VLANs Sales and Personnel.
Page 105 STP domain such that there are no active loops in the topology. STP could conﬁgure the topology in a number of ways to make it loop-free. In Figure 7-4, the connection between Switch A and Switch B is put into blocking state, and the connection between Switch Y and Switch Z is put into blocking state.
Page 106: Stp Conﬁgurations To Avoid
Switch 1 Figure 7-5 Tag-based STP conﬁguration STP may block trafﬁc between Switch 1 and Switch 3 by disabling the trunk ports for that connection on each Switch. Switch 2 has no ports assigned to VLAN marketing. Therefore, if the trunk for VLAN Marketing on Switches 1 and 3 is blocked, the trafﬁc...
Page 107: Creating Stp Domains
Figure 7-6 Port-based STP conﬁguration To remove all the bridging loops, STP may block trafﬁc on the VLAN Sales trunk between Switch 1 and Switch 2, on the VLAN Sales trunk between Switch 2 and Switch 3, and on the VLAN Marketing trunk between Switch 1 and Switch 3.
Page 108: Enabling Stp On The Switch
7-10 7: S HAPTER PANNING Enabling STP on To enable STP for one or more STP domains on your Switch, use the the Switch following command at the administrator prompt: enable stpd [<stpd_name> | all] Conﬁguring STP You can conﬁgure the following STP parameters for each STPD on the Switch: You can conﬁgure the following STP parameters for each port on the...
Page 109 2 x (Forward Delay –1). Allows you to specify the priority of the STPD. By changing the priority of the Switch, you can make it more or less likely to become the Root Bridge. The range is 0–65,535. The default setting is 32,768. A setting of 0 indicates the highest priority.
Page 110: Conﬁguration Example
7-12 7: S HAPTER PANNING Conﬁguration The following example creates and enables an STPD named Example Backbone_st. It assigns the Manufacturing VLAN to the STPD. It disables STP on ports 1 through 3, and port 4. create stpd backbone_st config stpd backbone_st add vlan manufacturing enable stpd backbone_st disable stpd backbone_st port 1-3,4 Displaying STP...
Page 111 Sample output from the command is as follows: 3C16910:28 # sh stpd s0 po 5-8 Stpd: s0 Port: 8 PortId: 8008 Stp: ENABLED Port State: FORWARDING Port Priority: 128 Designated Root: 80:00:08:00:4e:2c:13:00 Designated Cost: 0 Designated Bridge: 80:00:08:00:4e:2c:13:00 Designated Port Id: 8008 Stpd: s0 Port: PortId: 8007 Stp: ENABLED...
Page 112: Disabling And Resetting Stp
7-14 7: S HAPTER PANNING Disabling and To disable STP or return STP settings to their defaults, use the Resetting STP commands listed in Table 7-2. Table 7-2 STP Disable and Reset Commands Command delete stpd <stpd_name> disable stpd [<stpd_name> | all] disable stpd port <portlist>...
Page 113: Ip Unicast Routing
IP U This chapter describes how to conﬁgure IP routing on the Switch 3800. It assumes that you are already familiar with IP unicast routing. If not, refer to the following publications for additional information: RFC 1058 — Routing Information Protocol RFC 1256 —...
Page 114: Populating The Routing Table
NICAST OUTING In Figure 8-1, a Switch 3800 is shown with two VLANs deﬁned: Finance and Personnel. Ports 1 and 3 are assigned to Finance; ports 2 and 4 are assigned to Personnel. Finance belongs to the IP network 192.207.35.0;...
Page 115: Dynamic Routes
Static routes are manually entered into the routing table. Static routes are used to reach networks not advertised by routers. You can conﬁgure up to 64 static unicast routes on the Switch 3800. Static routes can also be used for security reasons, to control which routes you want advertised by the router.
Page 116: Conﬁguring Ip Unicast Routing
Conﬁguring IP This section describes the commands associated with conﬁguring IP Unicast Routing unicast routing on the Switch 3800. Conﬁguring routing involves the following steps: When you create a VLAN, RIP is enabled by default. You must, however, enable RIP on the Switch to route trafﬁc. To disable RIP on a particular VLAN, use the following command: Verify the Switch operating mode is set to “iprouting”...
Page 117: Verifying The Ip Unicast Routing Conﬁguration
DHCP/BOOTP Relay Switch 3800 to forward DHCP or BOOTP requests coming from clients on subnets being serviced by the Switch 3800 and going to hosts on different subnets. This feature can be used in various applications, including DHCP services between Windows NT servers and clients running Windows 95.
Page 118 8: IP U HAPTER NICAST OUTING Table 8-1 describes the commands used to conﬁgure basic IP settings on the Switch. Table 8-1 Basic IP Commands Command enable bootp {vlan <name> | all} enable bootprelay enable ipforwarding {vlan <name> | all} enable ipforwarding broadcast {vlan <name>...
Page 119 Table 8-1 Basic IP Commands (continued) Command clear ipfdb [<ipaddress> | vlan <name> | all] Table 8-2 describes the commands used to conﬁgure the IP route table. Table 8-2 Route Table Conﬁguration Commands Command config iproute add <ipaddress> <mask> <gateway> {<metric>} config iproute delete <ipaddress>...
Page 120 8: IP U HAPTER NICAST OUTING Table 8-3 RIP Conﬁguration Commands (continued) Command enable rip splithorizon enable rip triggerupdate config rip add {vlan <name> | all} config rip delete {vlan <name> | all} Disables RIP on an IP interface. When RIP is disabled on the config rip garbagetime {<delay>} config rip routetimeout {<delay>} config rip rxmode [none | v1only |...
Page 121 Table 8-3 RIP Conﬁguration Commands (continued) Command disable rip splithorizon disable rip poisonreverse disable rip triggerupdate disable rip exportstatic unconfig rip {vlan <name> | all} Table 8-4 describes the commands used to conﬁgure the ICMP protocol. Table 8-4 ICMP Conﬁguration Commands Command enable icmp redirects {vlan <name>...
Page 122: Routing Conﬁguration Example
{vlan <name> | all} Routing Figure 8-2 illustrates a Switch that has three VLANs deﬁned as follows: Conﬁguration Example The stations connected to ports 1 through 4 generate a combination of IP trafﬁc and NetBIOS trafﬁc. The IP trafﬁc is ﬁltered by the protocol-sensitive VLANs.
Page 123 192.207.35.1 My Company 192.207.35.0 Finance NetBIOS NetBIOS Figure 8-2 Unicast Routing Conﬁguration Example In this conﬁguration, all IP trafﬁc from stations connected to ports 1 and 3 have access to the router by way of the VLAN Finance. Ports 2 and 4 reach the router by way of the VLAN Personnel.
Page 124: Displaying Router Settings
VLAN name, VLANid Global ICMP configuration Global router advertisement configuration Displays IP statistics for the CPU of the Switch. Displays the IP Address Resolution Protocol (ARP) table. You can filter the display by IP address, VLAN, or permanent entries. Each entry displayed includes the following:...
Page 125: Resetting And Disabling Router Settings
Table 8-5 Router Show Commands (continued) Command show rip stat {vlan <name> | all} Resetting and To return router settings to their defaults and disable routing Disabling Router functions, use the commands listed in Table 8-6. Settings Table 8-6 Router Reset and Disable Commands Command clear iparp [<ipaddress>...
Page 126 8-14 8: IP U HAPTER NICAST OUTING Table 8-6 Router Reset and Disable Commands (continued) Command disable rip {vlan <name> | all} disable rip aggregation disable rip splithorizon disable rip poisonreverse disable rip triggerupdate disable rip exportstatic unconfig icmp unconfig irdp unconfig rip {vlan <name>...
Page 127: Status Statistics
This chapter describes how to view the current operating status of the Switch, how to display information in the Switch log, and how to take advantage of the RMON capabilities available in the Switch. Viewing statistics on a regular basis allows you to: Status Monitoring The status monitoring facility provides information about the Switch.
Page 128: Status Monitoring And Statistics
If not specified, informational priority messages and higher are displayed. subsystem — Filters the log to display messages associated with the selected Switch subsystem. Subsystems include Syst, STP Brdg, SNMP, Telnet, VLAN, and Port. If not specified, all subsystems are displayed.
Page 129: Status Monitoring
Number of RIP peers Peer information Displays the currently active Telnet and console sessions communicating with the Switch. Provides the user name, IP address of the incoming Telnet session, whether a console session is currently active, and logon time. Sessions are numbered.
Page 130: Port Statistics
{<name> | all} Port Statistics The Switch 3800 provides a facility for viewing port statistic information. The summary information lists values for the current counter against every port on the Switch and it is refreshed approximately every 2 seconds. Values are displayed to 9 digits of accuracy.
Page 131 The following port statistic information is collected by the Switch: Link Status — The current status of the link. Options are: Ready — The port is ready to accept a link. Active — The link is present at this port.
Page 132: Port Errors
HAPTER TATUS ONITORING AND Port Errors The Switch 3800 keeps track of errors for each port. To view port error, type show port <portlist> errors The following port error information is collected by the Switch: Link Status — The current status of the link. Options are: Transmit Collisions (TX Coll) —...
Page 133: Switch Logging
Receive Frames Lost (RX Lost) — The total number of frames received by the port that were lost. Switch Logging The Switch 3800 log tracks all conﬁguration and fault information pertaining to the device. Each entry in the log contains the following information:...
Page 134: Local Logging
Telnet VLAN Port Local Logging The Switch maintains up to 1,000 messages in its internal log. You can display a snapshot of the log at any given point in time by using the following command: show log {<priority>} {<subsystem>} where the following is true: Real-time Display In addition to viewing a snapshot of the Switch log, you can conﬁgure...
Page 135: Remote Logging
You must restart the log display by using the enable log display Remote Logging In addition to maintaining an internal log, the Switch 3800 supports remote logging by way of the UNIX Syslog host facility. To enable remote logging, do the following: Conﬁgure the Syslog host to accept and log messages.
Page 136: Logging Commands
If not specified, informational priority messages and higher are displayed. subsystem — Filters the log to display messages associated with the selected Switch subsystem. Subsystems include Syst, STP, Brdg, SNMP, Telnet, VLAN, and Port. If not specified, all subsystems are displayed.
Page 137: Rmon
The following sections explain more about RMON concepts and the RMON features supported by the Switch 3800. You can only use the RMON features of the Switch if you have an RMON management application, such as the RMON application supplied with 3Com’s Transcend® Enterprise Manager.
Page 138: About The Rmon Groups
TATUS ONITORING AND A typical RMON setup consists of the following two components: About the RMON The Switch 3800 supports the following four RMON groups: Groups This section describes how to use each of these groups to monitor your network.
Page 139: Alarms
Beneﬁts of RMON Using the RMON features of your Switch has the following three main advantages: It improves network monitoring efﬁciency. It allows you to manage the network in a more proactive manner.
Page 140: Rmon And The Switch
Implementing RMON in the Switch means that all ports can have security features enabled. RMON Features of Table 9-5 details the RMON support provided by the Switch 3800. the Switch Table 9-5 RMON Support Supplied By the Switch 3800...
Page 141: About Event Actions
When using the RMON features of the Switch, you should note the following: About Event Actions You can deﬁne up to 50 alarms for the Switch. The actions that you can deﬁne for each alarm are shown in Table 9-6. Table 9-6 Event Actions...
Page 142 9-16 9: S HAPTER TATUS ONITORING AND TATISTICS...
Page 143: Software Upgrade And Boot Options
Downloading a new image involves the following: The Switch 3800 can store up to two images; a primary and a secondary. When you download a new image, you must select into which image space (primary or secondary) you want the new image to be placed.
Page 144: Rebooting The Switch
Switch, you must save the conﬁguration to non-volatile storage. The Switch 3800 can store two different conﬁgurations; a primary and a secondary. When you save conﬁguration changes, you can select which conﬁguration you want the changes saved to. If you do not specify, the changes are saved to the current conﬁguration area.
Page 145: Returning To Factory Defaults
This command resets the entire conﬁguration, with the exception of user accounts and passwords that have been conﬁgured. To reset all parameters, use the following command: unconfig switch all Boot Option Table 10-1 lists the commands associated with Switch 3800 boot Commands options. Table 10-1 Boot Option Commands Command download image <ipaddress>...
Page 146 10-4 10: S HAPTER OFTWARE PGRADE AND PTIONS...
Page 147: Safety Information
You must read the following safety information before carrying out any installation or removal of components, or any maintenance procedures on the Switch 3800. Important Safety Information WARNING: Warnings contain directions that you must follow for your personal safety. Follow all instructions carefully.
Page 148: Power Cord
Neutral, connected directly to earth (ground). †Impédance à la terre United Kingdom only The Switch 3800 is covered by Oftel General Approval, NS/G12345/J/100003, for indirect connection to a public telecommunications system. This can only be acheived using the console port on the unit and an approved modem.
Page 149: Fuse
If the power cord plug is unsuitable and must be replaced, you may ﬁnd other codings for the respective connections. Connect the power supply wires for the unit according to the following scheme: Brown wire to the Live (Line) plug terminal which may be marked with the letter ‘L’...
Page 150: Appendix A: Safetyi
Suivez toutes les directives avec soin. Veuillez lire à fond l'information de la sécurité suivante avant d'installer le Switch 3800. Replace the lithium battery with the same or equivalent type, as recommended by the manufacturer.
Page 151: Power
L’information de Sécurité Importante Pour réduire les risques d'incendie ou de choc électrique, installez ce groupe sous abri dans une zone dont la température et l'humidité sont régulées et qui ne contient pas de produits contaminateurs conductifs. Power Pour garantir le respect des normes internationales de sécurité, utilisez uniquement l'adaptateur électrique remis avec cet appareil.
Page 152: Cordon Électrique
A: S PPENDIX AFETY NFORMATION Cordon électrique Etats-Unis et Canada Danemark Suisse Fuse Il doit être agréé dans le pays d'utilisation : Le cordon doit avoir reçu l'homologation des UL et un certiﬁcat de la CSA Le cordon souple doit respecter, à titre minimum, les spéciﬁcations suivantes : calibre 18 AWG type SV ou 5J...
Page 153: Ports Pour Fibres Optiques
porte-fusibles. Pour ce groupe, vous devez uniquement utiliser des fusibles réalisés par le même constructeur et offrant le même pouvoir de coupure et respectant le même type que le fusible d'origine. Refermez le porte-fusibles. Pour respecter les normes européennes de sécurité, il ne faut pas monter un fusible de rechange sur l'admission de cet appareil.
Page 154: Wichtige Sicherheitsinformationen
WARNUNG: Warnungen enthalten Anweisungen, die zur eigenen Sicherheit unbedingt zu beachten sind. Bitte befolgen Sie alle Anweisungen sorgfältig und genau. Bitte unbedingt vor dem Einbauen des Switch 3800 Einheit die folgenden Sicherheitsanweisungen durchlesen. Power les batteries au lithium ne ﬁgurent pas sur la liste EPA des déchets dangereux.
Page 155: Power Cord
Das Gerät muß an eine geerdete Steckdose angeschlossen werden, die die europäischen Sicherheitsnormen erfüllt. Das Gerät nicht an eine Wechselstromsteckdose anschließen, die nicht geerdet ist. Die Netzsteckdose muß in der Nähe des Geräts und leicht zugänglich sein. Die Stromversorgung des Geräts kann nur durch Herausziehen des Gerätenetzkabels aus der Netzsteckdose unterbrochen werden.
Page 156: Faseroptikanschlüsse - Optische Sicherheit
A-10 A: S PPENDIX AFETY NFORMATION Fuse Zur Erfüllung europäischer Sicherheitsnormen darf keine Ersatzsicherung am Geräteeingang angebracht werden. Es dürfen nur Sicherungen vom gleichen Hersteller, der gleichen Marke und Art mit dem Gerät verwendet werden. Faseroptikanschlüsse Niemals mit einem Vergrößerungsgerät ein Übertragungs-LED/Laser - Optische Sicherheit betrachten, während dieses eingeschaltet ist.
Page 157: Lithiumbatterie
Lithiumbatterie Die Lithiumbatterie nach den Empfehlungen des Herstellers durch eine Batterie des gleichen oder eines gleichwertigen Typs ersetzen. WARNHINWEIS: Wird die Batterie falsch ersetzt, besteht Explosionsgefahr. Verbrauchte Batterien nach den Angaben des Herstellers entsorgen. Batterien nicht in Wasser eintauchen oder verbrennen. Die Entsorgungsbestimmungen sind je nach Land verschieden.
Page 158 A-12 A: S PPENDIX AFETY NFORMATION...
Page 159: Specifications
Physical Dimensions Environmental Requirements Operating Temperature Storage Temperature Operating Humidity Standards Safety Agency Certifications AC Protection Electromagnetic Compatibility Heat Dissipation Power Supply AC Line Frequency Input Voltage Options Current Rating ECHNICAL PECIFICATIONS Height: 3.5 inches x Width: 17.32 inches x Depth: 17.32 inches Weight: 22 pounds 0 to 40˚...
Page 160: Appendix B: Technical Specifications
B: T PPENDIX ECHNICAL PECIFICATIONS Standards Supported Ethernet ISO 8802-3 IEEE 802.3z/D3 ISO 10038:1993 (IEEE 802.1D) IEEE 802.1Q/D10 SNMP SNMP protocol (RFC 1157) MIB-II (RFC 1213) Bridge MIB (RFC 1493) VLAN MIB (RFC 1573) RMON MIB (RFC 1757) Terminal Emulation Telnet (RFC 854) Protocols Used for Administration UDP (RFC 768)
Page 161: Troubleshooting
If you encounter problems when using the Switch, this Appendix may be helpful. If you have a problem which is not listed here or in the release notes, please contact your local technical support representative. LEDs Power LED does not light: Check that the power cable is ﬁrmly connected to the device and to...
Page 162: Using The Command-Line Interface
Check that the device's IP address, subnet mask and default router are correctly conﬁgured, and that the device has been reset. Ensure that you enter the IP address of the Switch correctly when invoking the Telnet facility. Check that Telnet access was not disabled for the Switch.
Page 163 There may be a network problem preventing you accessing the device over the network. Try accessing the device through the console port. Check that the community strings conﬁgured for the Switch and the network manager are the same. Check that SNMP access was not disabled for the Switch.
Page 164: Vlans
C: T PPENDIX ROUBLESHOOTING You forget your password and cannot log on: If you are not an administrator, another user having administrator access level can log on, delete your user name, and create a new user name for you, with a new password. Alternatively, another user having administrator access level can log in and initialize the device.
Page 165: Stp
VLANids are the same, the Ethertype ﬁeld used to identify packets as 802.1Q packets may differ between the devices. The default value used by the switch is 8100. If the third party device differs from this and cannot be changed, you may change the 802.1Q Ethertype used by the switch with the command: config dot1p ethertype <ethertype>...
Page 166: Routing
Specify that the endstation entries are static or permanent. Routing The Switch sees RIP updates but other routers don’t: Ensure that the RIP transmit and receive modes are appropriate for the environment. If other routers only use RIP Version 1, ensure the switch is transmitting V1 updates.
Page 167: Technical Support
For the very latest, we recommend that you access 3Com Corporation’s World Wide Web site as described below. Online Technical 3Com offers worldwide product support 24 hours a day, 7 days a Services week, through the following online systems: World Wide Web Site Access the latest networking information on 3Com Corporation’s World...
Page 168: Access By Digital Modem
3Com Corporation’s interactive fax service, 3ComFacts, provides data Automated Fax sheets, technical articles, diagrams, and troubleshooting instructions on Service 3Com products 24 hours a day, 7 days a week. Call 3ComFacts using your Touch-Tone telephone using one of these international access numbers: Country Hong Kong U.K.
Page 169: 3Comforum On Compuserve Online Service
3ComForum on 3ComForum is a CompuServe-based service containing patches, CompuServe ® software, drivers, and technical articles about all 3Com products, as Online Service well as a messaging section for peer support. To use 3ComForum, you need a CompuServe account. To use 3ComForum: 1 Log on to CompuServe.
Page 170: Support From 3Com
Support from 3Com If you are unable to receive support from your network supplier, technical support contracts are available from 3Com. Contact your local 3Com sales ofﬁce to ﬁnd your authorized service provider using one of these numbers: Regional Sales Office...
Page 171: Returning Products For Repair
Returning Products Before you send a product directly to 3Com for repair, you must ﬁrst be for Repair obtain a Return Materials Authorization (RMA) number. Products sent to 3Com without RMA numbers will be returned to the sender unopened, at the sender’s expense.
Page 172 D: T PPENDIX ECHNICAL UPPORT...
Page 173 The port on the Switch accepting a terminal or modem connector. It changes the parallel arrangement of data within computers to the serial form used on data transmission links. This port is most often used for...
Page 174 The point of aggregation within a corporate network where a switch provides high-performance access to server farms, a high-speed backbone connection and a control point for network management and security.
Page 175 Non-volatile RAM. NVRAM retains its contents when the Switch is powered off. PACE Priority Access Control Enabled that is 3Com’s innovative technology to work in conjunction with a switch in order to control the latency and jitter associated with the transmission of multimedia trafﬁc over Ethernet and Fast Ethernet.
Page 176 Trivial File Transfer Protocol that allows the transfer of ﬁles (such as software upgrades) from a remote device using the Switch’s local management capabilities. Transcend 3Com’s umbrella management system used to manage all of 3Com’s networking solutions. trap A message sent by an SNMP agent to an authorized trap receiver (usually a network management station) to indicate the occurrence of a signiﬁcant event, such as an error condition or a threshold that has...
Page 177 NDEX Numerics 3Com Bulletin Board Service (3ComBBS) 3Com sales ofﬁces 3Com URL 3ComFacts 3ComForum accounts, creating 9-15 alarms 9-13, 9-14 Alarms (RMON group) BOOTP Bridge Identiﬁer bridge priority, conﬁguring 4-14, 7-11 bulletin board service 4-5, 4-6 Commands common history shortcuts...
Page 178 NDEX router interfaces router show commands (table) routing table conﬁguration commands (table) dynamic routes populating static routes 8-12 settings, displaying LEDs load sharing 3-15 3-15 conﬁguring log display logging and Telnet 9-10 commands fault level local real-time display remote subsystem timestamp logging on 4-14, 7-11...
Page 179 Hello Time 4-14, 7-11 conﬁguring description Max Age 4-14, 7-11 conﬁguring overview 4-15, 7-11 path costs port priority 4-15, 7-11 Switch 3800 conﬁguration examples dimensions 1-10 factory defaults free-standing installation front view Gigabit Ethernet ports installing LEDs positioning rack mounting...
Page 180 NDEX...
Page 181 XCLUSIVE ARRANTY 3Com warrants its hardware products to be free from defects in workmanship and materials, under normal use and service, for the following lengths of time from the date of purchase from 3Com or its Authorized Reseller: Network adapters...
Page 182 ATTEMPTS TO REPAIR OR MODIFY, OR ANY OTHER CAUSE BEYOND THE RANGE OF THE INTENDED USE, OR BY ACCIDENT, FIRE, LIGHTNING, OR OTHER HAZARD. TO THE FULL EXTENT ALLOWED BY LAW, 3COM ALSO EXCLUDES FOR ITSELF AND ITS SUPPLIERS ANY LIABILITY, WHETHER BASED IN CONTRACT OR TORT (INCLUDING NEGLIGENCE), FOR INCIDENTAL,...

This manual is also suitable for:

Superstack ii 3800

3Com 3800 User Manual

About this Guide

Switch 3800 Overview

Installation and Setup

Accessing the Switch

Commands

Virtual Lan S

Switch Forwarding Database (Fdb)

Spanning

Ip Unicast Routing

Status Monitoring and Statistics

Software Upgrade and Boot Options

Safety Information

100 C Troubleshooting

Quick Links

User Guide

Need help?

Questions and answers

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Summary of Contents for 3Com 3800