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Cabletron Systems SmartSTACK ELS100-S24TX2M Management Manual

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SmartSTACK
ELS100-S24TX2M
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MANAGEMENT GUIDE
9033259

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Summary of Contents for Cabletron Systems SmartSTACK ELS100-S24TX2M

  • Page 1 SmartSTACK ELS100-S24TX2M FAST ETHERNET SWITCH MANAGEMENT GUIDE 9033259...
  • Page 3 Only qualified personnel should perform installation procedures. Cabletron Systems reserves the right to make changes in specifications and other information contained in this document without prior notice. The reader should in all cases consult Cabletron Systems to determine whether any such changes have been made. The hardware, firmware, or software described in this manual is subject to change without notice.

  • Page 5: Table Of Contents

    Configuring the Switch ........
  • Page 6 Setting SNMP Management Access ......70 Viewing Switch Statistics ........70 Configuring Port Mirroring .
  • Page 7 Forwarding Tagged/Untagged Frames ......93 Forwarding Traffic with Unknown VLAN Tags ....93 Automatic VLAN Registration .
  • Page 8 viii Table of Contents ELS100-S24TX2M...

  • Page 9: Management Overview

    Telnet connection over the network (in-band). The Management Module is based on SNMP (Simple Network Management Protocol). This SNMP agent permits a switch stack to be managed from any PC in the network using in-band management software (such as Cabletron’s SPECTRUM).

  • Page 10: Remote Management Via The Console Port

    RS232 cable with a 9-pin connector on one end and a 25-pin connector on the other end. Set the modem at the switch’s site to force auto-answer mode. The following is a sample initialization string: “ATQ1S0=1&D0&K0&W” as defined below:...

  • Page 11: In-Band Network Connection

    In-Band Network Connection The on-board configuration program can be accessed using Telnet from any computer attached to the network. The switch and stack can also be managed by any computer using a Web browser (Internet Explorer 4.0 or above, or Netscape Navigator 4.0 or above), or from a network computer using network management software such as Cabletron’s SPECTRUM.
  • Page 12 12 Management Overview ELS100-S24TX2M...

  • Page 13: Els100-S24Tx2M User Interface

    (with a direct cable connection or over modems), or using Telnet to access the Management Module over the network. These menus allow you to reconfigure the switch, as well as to monitor the status and performance of the switch or the attached stack. The menus have a layout similar to the sample Main Menu shown in Figure 2-1.

  • Page 14: User Access

    The default user names are “admin” and “guest,” with no passwords. The administrator has Read/Write access, which allows you to read and modify switch information. The guest has Read Only access to the management program, which allows you to view switch information, but not modify any operating parameters.

  • Page 15: Factory Defaults

    Factory Defaults Table 2-1 lists the default settings for switch configuration parameters. Each parameter can be changed via the console menus or Telnet. Table 2-1. Factory Default Settings Parameter Multicast Filtering GMRP IGMP Multicast Filtering Port Configuration Flow Control Speed and Duplex...
  • Page 16 Parameter Virtual LANs Acceptable VLAN Frame Type Configurable PVID Tagging GVRP Untagged VLAN Group Assignment VLAN Ingress Filtering VLAN Learning 16 ELS100-S24TX2M User Interface Default Value Disabled False ELS100-S24TX2M...

  • Page 17: Main Menu

    Main Menu SmartSTACK Local Management -- ELS100-S24T X2M Use <TAB> or arrow keys to move. <Enter> to select. Selection System Information Menu System Information Switch Information Management Setup Menu Network Configuration Serial Port Configuration SNMP Configuration Console Login...
  • Page 18 Provides full address listing, as well as search and clear functions. Displays all the multicast groups active on this switch, including multicast IP addresses and corresponding VLAN IDs. Used to manually configure host MAC addresses in the unicast table.

  • Page 19: System Information Menu

    System Information Menu Use the System Information Menu to display a basic description of the switch, including contact information, and hardware/firmware versions. SmartSTACK Local Management -- ELS100-S24T X2M Use <TAB> or arrow keys to move. < Enter> to select. Figure 2-3. System Information Menu...

  • Page 20: Displaying System Information

    Displaying System Information Use the System Information screen to display descriptive information about the switch, or for quick system identification as shown in the following figure and table. SmartSTACK Local Management -- ELS100-S24T X2M System Description : SmartSTACK ELS1000-S24T X2M System Object ID : 1.3.6.1.4.1.52.3.9.1.10.7...

  • Page 21: Displaying Switch Version And Module Information

    Displaying Switch Version and Module Information Use the Switch Information screen to display hardware/firmware version numbers for the main board and agent modules, as well as the power status and modules plugged into the system. SmartSTACK Local Management -- ELS100-S24T X2M <OK>...

  • Page 22: Management Setup Menu

    Management Setup Menu After initially logging onto the system, adjust the communication parameters for your console to ensure a reliable connection (Serial Port Configuration). Specify the IP addresses for the agent module (Network Configuration / IP Configuration), and then set the Administrator and User passwords (Console Login Configuration).

  • Page 23: Changing The Network Configuration

    Use <TAB> or arrow keys to move. < Enter> to select. Figure 2-7. Network Configuration Par ameter Descr iption IP Configuration Screen used to set the bootup option, or configure the switch’s IP parameters. IP Connectivity Test Screen used to test IP connectivity to a (Ping) specified device. HTTP Configuration Screen used to enable the Web Agent.

  • Page 24: Ip Configuration

    IP Configuration Use the IP Configuration screen to set the bootup option, or configure the switch’s IP parameters. The screen shown below is described in the following table. SmartSTACK Local Management -- ELS100-S24T X2M Use <TAB> or arrow keys to move, other keys to make changes.

  • Page 25: Ip Connectivity Test (Ping)

    <OK> until a BOOTP reply has been received. BOOTP requests will be periodically broadcast by the switch in an effort to learn its IP address. (BOOTP values can include the IP address, default gateway, subnet mask, TFTP boot file name, and TFTP server IP.)

  • Page 26: Http Configuration

    HTTP Configuration Use the HTTP Configuration screen to enable/disable the on-board Web agent, and to specify the TCP port that will provide HTTP service. The screen shown below is described in the following table. SmartSTACK Local Management -- ELS100-S24T X2M <APPLY>...

  • Page 27: Configuring The Serial Port

    Configuring the Serial Port You can access the on-board configuration program by attaching a VT100 compatible device to the switch’s serial port. (For more information on connecting to this port, see “Required Connections” on page 9.) The communication parameters for this port can be accessed from the Serial Port Configuration screen shown below and described in the following table.

  • Page 28: Assigning Snmp Parameters

    Network Management Station (NMS), can be used to access this information. Access rights to the on-board agent are controlled by community strings. To communicate with the switch, the NMS must first submit a valid community string for authentication. The options for configuring community strings and related trap functions are described in the following sections.

  • Page 29: Configuring Community Names

    Configuring Community Names The following figure and table describe how to configure the community strings authorized for management access. Up to 5 community names may be entered. SmartSTACK Local Management -- ELS100-S24T X2M 1. public 2. private <APPLY> Use <TAB> or arrow keys to move, other keys to make changes. Figure 2-13.

  • Page 30: Configuring Ip Trap Managers

    Configuring IP Trap Managers The following figure and table describe how to specify management stations that will receive authentication failure messages or other trap messages from the switch. Up to 5 trap managers may be entered. SmartSTACK Local Management -- ELS100-S24T X2M <APPLY>...

  • Page 31: Console Login Configuration

    Console Login Configuration Use the Management Setup: Console Login Configuration to restrict management access based on specified user names and passwords, or to set the invalid password threshold and timeout. There are two user types, Administrator and Guest. Only the Administrator has write access for parameters governing the SNMP agent.

  • Page 32: Downloading System Software

    Downloading System Software Using TFTP Protocol to Download Over the Network Use the TFTP Download menu to load software updates into the switch. The download file should be an ELS100-S24TX2M file from Cabletron; otherwise the agent will not accept it. The success of the download operation depends on the accessibility of the TFTP server and the quality of the network connection.

  • Page 33: Configuring The Switch

    Sets communication parameters for ports. Port Information Displays current port settings and port status. Spanning Tree Configures the switch, its ports and modules to participate in a Configuration local Spanning Tree. Spanning Tree Displays the current Spanning Tree configuration for the switch, Information its ports and modules.
  • Page 34 Selection 802.1Q VLAN Port Configuration Port GARP Configuration Port GMRP Configuration 34 ELS100-S24TX2M User Interface Descr iption Displays/configures port-specific VLAN settings, including PVID, ingress filtering, and GVRP. Configures generic attribute settings used in the spanning tree protocol, VLAN registration, multicast filtering. Configures GMRP multicast filtering.

  • Page 35: Configuring Port Parameters

    Configuring Port Parameters Use the Port Configuration menus to set or display communication parameters for any port or module on the switch. SmartSTACK Local Management -- ELS100-S24T X2M ------------------------------------------------------------------------- 11. 10/100TX <APPL Y> <OK> <C ANCEL > <PR EV U nit> <NEXT U NIT> <PREV PAGE> <NEXT PAGE>...

  • Page 36: Viewing The Current Port Configuration

    Shows the flow control type in use. Flow control can eliminate frame loss by “blocking” traffic from end stations connected directly to the switch. Back pressure is used for half duplex and IEEE 802.3x for full duplex. Note that flow control should not be used if a port is connected to a hub.

  • Page 37: Using The Spanning Tree Algorithm

    The Spanning Tree Algorithm can be used to detect and disable network loops, and to provide backup links between switches, bridges or routers. This allows the switch to interact with other bridging devices (that is, an STA-compliant switch, bridge or router) in your network to ensure that only one route exists between any two stations on the network.
  • Page 38 Parameter Default Spanning Tree Enabled Protocol Priority 32,768 Hello Time Max (Message) Age Forward Delay Description Enable this parameter to participate in an STA compliant network. Device priority is used in selecting the root device, root port, and designated port. The device with the highest priority becomes the STA root device.
  • Page 39 Defines the priority for the use of a port in the STA algorithm. If the path cost for all ports on a switch are the same, the port with the highest priority (i.e., lowest value) will be configured as an active link in the spanning tree.

  • Page 40: Viewing The Current Spanning Tree Configuration

    Viewing the Current Spanning Tree Configuration The Spanning Tree Information screen displays a summary of the STA information for the overall bridge or for a specific port or module. To make any changes to the parameters for the Spanning Tree, use the Spanning Tree Configuration menu.
  • Page 41 The path cost from the root port on this switch to the root device. Root Port The number of the port on this switch that is closest to the root. This switch communicates with the root device through this port. If there is no root port, then this switch has been accepted as the root device of the spanning tree network.
  • Page 42 • If two ports of a switch are connected to the same segment and there is no other STA device attached to this segment, the port with the smaller ID forwards packets and the other is blocked.

  • Page 43: Using A Mirror Port For Analysis

    Using a Mirror Port for Analysis You can mirror traffic from any source port to a target port for real-time analysis. You can then attach a logic analyzer or RMON probe to the target port and study the traffic crossing the source port in a completely unobtrusive manner.

  • Page 44: Configuring Port Trunks

    • Ports can only be assigned to one trunk. • The ports in a trunk must belong to the same switch chip (see the next page). • The ports at both ends of a connection must be configured as trunk ports.
  • Page 45 “Sorted by Trunk ID.” [More] Scrolls through the list of configured trunks. [Enable] [Disable] Enables/disables the selected trunk. The ports used for each trunk must all be on the same internal switch chip. The port groups permitted include: Group 1 1,2,3,4, 13,14,15,16...

  • Page 46: Igmp Multicast Filtering

    This switch uses IGMP (Internet Group Management Protocol) to query for any attached hosts who want to receive a specific multicast service. The switch looks up the IP Multicast Group used for this service and adds any port which received a similar request to that group. It then propagates the service request on to any neighboring multicast switch/router to ensure that it will continue to receive the multicast service.

  • Page 47: Configuring Igmp

    Configuring IGMP This protocol allows a host to inform its local switch/router that it wants to receive transmissions addressed to a specific multicast group. You can use the IGMP Configuration screen to configure multicast filtering shown below: SmartSTACK Local Management -- ELS100-S24T X2M <APPLY>...

  • Page 48: Configuring Bridge Mib Extensions

    (Refer to Network Monitor Menu / Static Unicast Address Table Configuration and Static Multicast Address Table Configuration.) This switch uses Shared VLAN Learning (SVL), whereby all ports share one VLAN filtering database. Allows you to override the default PVID setting (Port VLAN ID used in frame tags) and its egress status (VLAN-Tagged or Untagged) on each port.
  • Page 49 Par ameter Descr iption Bridge Settings Traffic Class* Multiple traffic classes are supported by this switch as indicated under Bridge Capabilities. However, you can disable this function by setting this parameter to False. GMRP* GARP Multicast Registration Protocol (GMRP) allows network devices to register endstations with multicast groups.

  • Page 50: Configuring Traffic Classes

    Configuring Traffic Classes IEEE 802.1p defines up to 8 separate traffic classes. This switch supports Quality of Service (QoS) by using two priority queues, with weighted fair queuing for each port. You can use the 802.1P Configuration menu to configure the default priority for each port, or to display the mapping for the traffic classes as described in the following sections.

  • Page 51: Port Priority Configuration

    Default priority can be set to any value from 0~7, where 0~3 Priority specifies the low priority queue and 4~7 specifies the high priority queue. Number of Egress Indicates that this switch supports two priority output queues. Traffic Classes 9033259 Unit 1 Port 1 - 12 Port...

  • Page 52: P Port Traffic Class Information

    802.1P Port Traffic Class Information This switch provides two priority levels with weighted fair queuing for port egress. This means that any frames with a default or user priority from 0~3 are sent to the low priority queue “0” while those from 4~7 are sent to the high priority queue “1”...

  • Page 53: Configuring Virtual Lans

    Configuring Virtual LANs You can use the VLAN configuration menu to assign any port on the switch to any of up to 16 LAN groups. In conventional networks with routers, broadcast traffic is split up into separate domains. Switches do not inherently support broadcast domains.

  • Page 54: Q Vlan Current Table Information

    The ID for the VLAN currently displayed. The value of sysUpTime (System Up Time) when this VLAN was created. Shows how this VLAN was added to the switch: Dynamic GVRP: Automatically learned via GVRP. Permanent: Added as a static entry.

  • Page 55: Q Vlan Static Table Configuration

    802.1Q VLAN Static Table Configuration Use this screen to create a new VLAN or modify the settings for an existing VLAN. You can add/delete port members for a VLAN from any unit in the stack, or prevent a port from being automatically added to a VLAN via the GVRP protocol.
  • Page 56 For example, the following screen displays settings for VLAN 2, which includes tagged ports 1-6, and forbidden port 12. (Note that the dashed lines show that there are no switch units in this system other than Unit 1.) SmartSTACK Local Management -- ELS100-S24T X2M...

  • Page 57: Q Vlan Port Configuration

    GVRP packets received on this port will be discarded and no GVRP registrations will be propagated from other ports. Note that GVRP must be enabled for the switch before this setting can take effect. (See Device Control Menu / Extended Bridge Configuration.)

  • Page 58: Monitoring The Switch

    Displays detailed statistical information for the selected port such as packet type and frame size counters. Provides full listing of all unicast addresses stored in the switch, as well as sort, search and clear functions. Displays the ports that belong to each GMRP Muticast group.

  • Page 59: Displaying Port Statistics

    Port Statistics display key statistics from the Ethernet-like MIB for each port. Error statistics on the traffic passing through each port are displayed. This information can be used to identify potential problems with the switch (such as a faulty port or unusually heavy loading). The values displayed have been accumulated since the last system reboot.

  • Page 60: Displaying Rmon Statistics

    Par ameter Internal Mac Transmit Errors* Carrier Sense Errors* The number of times that the carrier sense condition was lost or Frames Too Long Internal Mac Receive Errors* * The r eported values will always be zero because these statistics are not supported by the internal chip set.
  • Page 61 Par ameter Descr iption Drop Events The total number of events in which packets were dropped due to lack of resources. Received Bytes Total number of bytes of data received on the network. This statistic can be used as a reasonable indication of Ethernet utilization.

  • Page 62: Displaying The Unicast Address Table

    The number of static addresses in the table. The MAC address of a node. The VLAN(s) associated with this address or port. Switch unit in the stack (1~4). The port whose address table includes this MAC address. Indicates address status as: D: Dynamically learned, or P: Fixed permanently by SNMP network management software.

  • Page 63: Displaying The Ip Multicast Registration Table

    Displaying the IP Multicast Registration Table Use the IP Multicast Registration Table to display all the multicast groups active on this switch, including multicast IP addresses and the corresponding VLAN ID. SmartSTACK Local Management -- ELS100-S24T X2M Multicast IP ------------------------------------------------------------------------------------------------- 225.1.1.1...

  • Page 64: Configuring Static Unicast Addresses

    Use the Static Unicast Address Table Configuration screen to manually configure host MAC addresses in the unicast table. You can use this screen to associate a MAC address with a specific VLAN ID and switch port as shown below. SmartSTACK Local Management -- ELS100-S24T X2M...

  • Page 65: Resetting The System

    Retains the user names and passwords defined in the Console Authentication Login Configuration menu. Logging Off the System Use the Exit command under the Main Menu to exit the configuration program and terminate communications with the switch for the current session. 9033259 System Restart Menu : YES...
  • Page 66 66 ELS100-S24TX2M User Interface ELS100-S24TX2M...

  • Page 67: Configuring & Monitoring The Switch

    Setting password protection for the switch to prevent unauthorized access to console menus • Assigning an IP address for the switch if you plan to manage the switch using SNMP, or if you use Telnet to access the switch •...

  • Page 68: Setting Password Protection

    READ/WRITE. This setting allows anyone to use the console menus to modify any operational parameter. To protect the configuration of the switch from unauthorized modification, you should enable password protection to the console menus.

  • Page 69: Assigning An Ip Address

    Assigning an IP Address To assign an IP address to the switch, do the following: Select Management Setup Menu from the Main menu. Select Network Configuration and then IP Configuration. Highlight the IP address field and enter the IP address. Press [Enter].

  • Page 70: Setting Snmp Management Access

    The ELS100-S24TX2M switch can send SNMP messages called traps to SNMP management stations when an important event occurs with the switch. The switch allows up to five destinations to be configured for these trap messages to be sent. To configure SNMP access for the switch, do the following: Select Management Setup Menu from the Main Menu.

  • Page 71: Configuring Port Mirroring

    Downloading a Software Upgrade You can upgrade the operational software in the ELS100-S24TX2M switch without physically opening the switch or being in the same location. The software storage sector in the flash memory of the switch is reprogrammable, allowing you to easily download software feature enhancements and problem fixes to the switch from a local or remote location.

  • Page 72: Downloading Via The Serial Port

    A serial download is the easiest method to upgrade the ELS100-S24TX2M switch software, requiring the least amount of equipment and configuration. To download switch software via the serial port, do the following: With the console port connected, reset the switch by powering the switch off and then on.

  • Page 73: Downloading Via Tftp

    IP address, if this has not already been done, and entering the IP address of the TFTP server and the name of the upgrade file. To program the switch IP address, select the Management Setup Menu from the Main Menu screen, then select Network Configuration.

  • Page 74: Configuring Spanning Tree Parameters

    LAN segments for purposes of fault tolerance. Two or more physical paths between different segments can be created through the switch, with the Spanning Tree Protocol choosing a single path at any given time and disabling all others. If the chosen path fails for any reason, a disabled alternative is activated, thereby maintaining the connection.

  • Page 75: Configuring Vlans

    During periods of congestion, Class of Service settings ensure that traffic which has been assigned high priority is forwarded through the switch ahead of normal priority traffic. For further information, see Appendix C, “Class of Service”...

  • Page 76: Configuring Port Operation

    Configuring Port Operation You can configure switch ports for operational parameters such as auto- negotiation, duplex mode, port speed and flow control. The 100Base-FX fiber ports always operate in full duplex mode and 100Mbps speed. Therefore, these two parameters, along with auto-negotiation, are not configurable on these fiber ports.

  • Page 77: Configuring The Unicast Address Table

    MAC addresses in the forwarding table: • Dynamic MAC addresses, which are dynamically learned and removed by the switch based on a time period defined using the Aging Time option. • Static MAC addresses, which are entered manually, stored in nonvolatile memory and automatically placed in the address table.

  • Page 78: Setting A Default Gateway

    A BootP server must be operating on the network and be properly configured for this option to work. When this option is enabled, the switch tries to obtain an IP address from the BootP server.

  • Page 79: Configuring Port Trunks

    Configuring Port Trunks You can configure up to three port trunks on the ELS100-S24TX2M switch, or 12 for the entire stack. Each trunk can combine up to four ports into an aggregate connection with up to 800 Mbps of bandwidth when operating at full duplex.
  • Page 80 80 Configuring & Monitoring the Switch ELS100-S24TX2M...

  • Page 81: Snmp Management

    Managed entities supporting SNMP typically contain software, which runs locally on the device and is referred to as an agent. In Figure 4-1, software in an ELS100-S24TX2M switch functions as an agent, monitoring and controlling the functionality of the switch.

  • Page 82: Mib Objects

    RFC 1493 - Definitions of Managed Objects for Bridges • RFC 1757 - Remote Network Monitoring Management Information Base • IEEE 802.1Q - VLAN Bridge Management (Q-MIB) The ELS100-S24TX2M switch also supports Cabletron proprietary MIB extensions. 82 SNMP Management ELS100-S24TX2M...

  • Page 83: Rfc 1213 (Mib-Ii)

    RFC 1213 provides management of system-level parameters, including TCP/IP protocol-related statistics, IP addressing, and interface statistics for each switch port. MIB-II is the standard MIB defined by RFC 1213. All agent devices operating SNMP are required to support at least part of MIB-II.

  • Page 84: Rfc 1757 (Rmon Mib)

    Compiling MIB Extensions: Cabletron Website The MIBs supported by the ELS100-S24TX2M switch must be compiled into the SNMP network management platform before the switch can be managed. The supported MIBs are available using Cabletron’s website http://www.ctron.com...

  • Page 85: Appendix A. Spanning Tree Concepts

    Tree Protocol (STP) by performing the following functions: • Creates a single spanning tree from any arrangement of switching or bridging elements. The term “switch” is used as an equivalent to “bridge” in this document. • Compensates automatically for the failure, removal, or addition of any device in an active data path.

  • Page 86: Spanning Tree Protocol In A Network

    If the connection between A and B goes down, the link between A and C becomes active, thereby establishing a path between A and B through switch C. Additionally, if the connection between B and C goes down, the link between A and C becomes active, establishing a path between B and C through switch A.

  • Page 87: Spanning Tree Protocol Parameters

    Several configuration parameters control the operation of the Spanning Tree Protocol. Table A-1 describes the parameters and lists the ELS100-S24TX2M switch default settings for each parameter. You can cause serious network performance degradation if you do not fully understand Spanning Tree concepts. Be sure to consult personnel experienced with this process prior to configuring Spanning Tree parameter s.

  • Page 88: Spanning Tree Protocol Operation

    Spanning Tree Protocol Operation When the Spanning Tree Protocol is enabled for the first time or when there is a change in the network topology, such as a failure or the addition or removal of a component, the Spanning Tree Protocol automatically sets up the active topology of the current network.
  • Page 89 There are five (5) states that the ports can be in for spanning tree: • Blocking: A port in this state does not participate in the transmission of frames, thus preventing duplication arising through multiple paths existing in the active topology of the bridged LAN. •...
  • Page 90 90 Spanning Tree Concepts ELS100-S24TX2M...

  • Page 91: Appendix B. Virtual Lans (Vlans)

    IP addresses or IP subnets. VLANs inherently provide a high level of network security, since traffic must pass through a Layer 3 switch or a router to reach a different VLAN.

  • Page 92: Els100-S24Tx2M Vlan Configuration

    VLAN operation on the ELS100-S24TX2M is enabled by default. Therefore, all frames are transferred internally through the switch with a VLAN tag. This tag may already be on the frame entering the switch, or added to the frame by the switch. VLAN information already existing on frames entering the switch is automatically handled by the switch.

  • Page 93: Forwarding Tagged/Untagged Frames

    To forward a frame from a VLAN-aware device to a VLAN-unaware device, the switch first decides where to forward the frame, and then strips off the VLAN tag. However, to forward a frame from a VLAN-unaware device to a VLAN-aware device, the switch first decides where to forward the frame, and then inserts a VLAN tag reflecting this port’s default VID.

  • Page 94: Automatic Vlan Registration

    IEEE 802.1Q VLAN standard, it can be configured to broadcast a message to your network indicating the VLAN groups it wants to join. When this switch receives these messages, it will automatically place the receiving port in the specified VLANs, and then forward the message to all other ports.

  • Page 95: Appendix C. Class Of Service

    • normal As traffic enters the switch, it is assigned to one of the two priority levels according to information located in the 802.1Q header tag of the frame (see Appendix B, “Virtual LANs”) or according to the incoming port number.
  • Page 96 Figure C-1 shows priority queuing operating within a switch. Frames entering the switch through ports 1 and 4 are tagged as normal traffic and placed in a normal priority queue on the outbound port. Frames entering through ports 2 and 5 are tagged as high priority traffic and placed in a high priority queue on the outbound port.

  • Page 97: Appendix D. Ip Multicast Filtering

    A router, or multicast-enabled switch, can periodically ask their hosts is they want to receive multicast traffic. If there is more than one router/ switch on the LAN performing IP multicasting, one of these devices is elected “querier” and assumes the responsibility of querying the LAN for group members.
  • Page 99 INDEX address table unicast, 62 aging time, configuring, 77 Auto-negotiation, configuring, 76 BootP, configuring, 78 bridge MIB extensions, 48 Class of Service, configuring, 51, 75 community names, SNMP, 70 console lock-out, 68 console login configuration, 31 console port configuration, 27 connections, 9 modem connection, 10 default settings, 15...
  • Page 100 82 snooping, IGMP, 97 software upgrades, 71 Spanning Tree Algorithm, 37 Spanning Tree configuration, 74 STA, see Spanning Tree Algorithm, 37 switch information, 21 system information, 20 system restart, 65 Telnet connections, 10, 69 2 Index TFTP configuration for downloads, 32...
  • Page 102 150386-102 R01...

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