3com 3CB9LF20R User manual

http://www.3com.com/

CoreBuilder

®

9000

Release Notes

Fast Ethernet and Gigabit Ethernet Layer 2

Switching Modules, Release 3.0

■

20-port 10/100BASE-TX Fast Ethernet Layer 2 Switching Module

(3CB9LF20R)

■

36-port 10/100BASE-TX Fast Ethernet RJ-45 Layer 2 Switching

Module (3CB9LF36R)

■

36-port 10/100BASE-TX Fast Ethernet Telco Layer 2 Switching

Module (3CB9LF36T)

■

36-port 10/100BASE-TX Desktop Switching Module (RJ-45

Connectors) (3CB9LF36RL)

■

36-port 10/100BASE-TX Desktop Switching Module (RJ-21 Telco

Connectors) (3CB9LF36TL)

■

10-port 100BASE-FX Fast Ethernet Layer 2 Switching Module

(3CB9LF10MC)

■

20-port 100BASE-FX (MT-RJ) Fast Ethernet Layer 2 Switching

Module (3CB9LF20MM)

■

9-Port 1000BASE-SX Gigabit

Ethernet Layer 2 Switching Module

(

3CB9LG9MC)

Part No. 10013497

Published January 2000

3Com Corporation

5400 Bayfront Plaza

Santa Clara, California

95052-8145

in any form or by any means or used to make any derivative work (such as translation, transformation, or

adaptation) without written permission from 3Com Corporation.

3Com Corporation reserves the right to revise this documentation and to make changes in content from time

to time without obligation on the part of 3Com Corporation to provide notification of such revision or change.

3Com Corporation provides this documentation without warranty, term, or condition of any kind, either implied

or expressed, including, but not limited to, the implied warranties, terms, or conditions of merchantability,

satisfactory quality, and fitness for a particular purpose. 3Com may make improvements or changes in the

product(s) and/or the program(s) described in this documentation at any time.

If there is any software on removable media described in this documentation, it is furnished under a license

agreement included with the product as a separate document, in the hard copy documentation, or on the

removable media in a directory file named LICENSE.TXT or !LICENSE.TXT. If you are unable to locate a copy,

please contact 3Com and a copy will be provided to you.

UNITED STATES GOVERNMENT LEGEND

If you are a United States government agency, then this documentation and the software described herein are

provided to you subject to the following:

All technical data and computer software are commercial in nature and developed solely at private expense.

Software is delivered as “Commercial Computer Software” as defined in DFARS 252.227-7014 (June 1995) or

as a “commercial item” as defined in FAR 2.101(a) and as such is provided with only such rights as are

provided in 3Com’s standard commercial license for the Software. Technical data is provided with limited rights

only as provided in DFAR 252.227-7015 (Nov 1995) or FAR 52.227-14 (June 1987), whichever is applicable.

You agree not to remove or deface any portion of any legend provided on any licensed program or

documentation contained in, or delivered to you in conjunction with, these Release Notes.

Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may not

be registered in other countries.

3Com, the 3Com logo, CoreBuilder, LANsentry, PACE, SuperStack, and Transcend are registered trademarks of

3Com Corporation. 3Com Facts is a service mark of 3Com Corporation.

Netscape is a registered trademark of Netscape Communications Corporation in the United States and other

countries. Java is a registered trademark of Sun Microsystems, Inc. UNIX is a registered trademark in the United

States and other countries, licensed exclusively through X/Open Company, Ltd.

All other company and product names may be trademarks of the respective companies with which they are

associated.

C

ONTENTS

1

O

VERVIEW

Important Notices 7

Supported Modules 8

System Requirements 9

Boot Code and Operational Code 9

Optional Switch Fabric Module Redundancy 10

Optional Management Redundancy 10

2

R

ELEASE

H

IGHLIGHTS

Web-based Management 12

ISO Date and Time Format 13

New Modules 13

IGMP 14

10/100 Mbps Ethernet Port Monitoring 14

RMON Monitoring Applications 15

802.1p CoS 15

Loop Detection 15

Bridge Address Learning Limits 19

Secure Address Learning Mode 20

Configuring One Untagged System VLAN 22

Broadcast, Multicast, and Flood Rate Limiting 23

Module Packet-egress Rate Limiting 23

Port Multicast Packet-ingress Rate Limiting 25

How Port Rate Limits and Thresholds Work 26

3

R

ELEASE

I

SSUES

Corrected Problems 27

System 27

Management 27

Ethernet 27

Bridging 28

VLANs 29

System Issues 29

Staging 29

System 29

Management 30

Web-based Management 30

SNMP 30

Ethernet 30

Bridging 31

Resilient Links 32

IGMP 32

Trunking 32

VLANs 32

Known Problems 34

System 34

Management 34

Ethernet 37

Bridging 38

Trunking 38

Documentation Changes 40

Ethernet 40

Web-based Management 40

4

S

OFTWARE

I

NSTALLATION

How to Obtain Software Image Files 41

Installation and Upgrade Prerequisites 41

Verifying and Updating Modules for an Existing Chassis 42

Verifying and Updating Modules for a New Chassis 43

Downloading Software 44

Downloading Release 3.0 Software 44

Update Emergency Download Parameters 46

Downgrading Switching Modules to Software Release 2.1.0 48

5

R

EFERENCE

Identifying Modules in the Switch 49

Applicable Documents 51

MIB Files 51

3Com Enterprise MIBs 52

Entering Commands 53

Understanding Autonegotiation 53

Year 2000 Compliance 54

6

T

ECHNICAL

S

UPPORT

Online Technical Services 55

World Wide Web Site 55

3Com Knowledgebase Web Services 55

3Com FTP Site 56

3Com Bulletin Board Service 56

Access by Analog Modem 56

Access by Digital Modem 57

3Com Facts Automated Fax Service 57

Support from Your Network Supplier 57

Support from 3Com 57

Returning Products for Repair 59

1

O

VERVIEW

These release notes summarize operational requirements and issues for

CoreBuilder

®

9000 Layer 2 switching module software Release 3.0.

Important Notices

Read these important notices before you begin.

For the most up-to-date release notes for the CoreBuilder 9000

management modules, switch fabric modules, Layer 3 interface modules,

and other Layer 2 interface modules, visit the 3Com Web site:

http://support.3com.com/nav/switches.htm

CAUTION:

CoreBuilder

9000 software Release 3.0 requires that the

Enterprise Management Engine (EME) have 20 MB of CPU RAM. To

determine the CPU RAM size, enter

show eme

from the EME command

line interface. The

CPU Ram Size(MB)

field on the left side of the screen

indicates the amount of CPU RAM:

8

or

20

.

If your EME has 8 MB of CPU RAM, you must replace the 4 MB DRAM

card in your EME with a 16 MB DRAM card. Contact your network

supplier or 3Com representative for information about how to obtain a

16 MB DRAM memory card.

CAUTION:

Except for the Enterprise Management Controller (EMC) boot

file,

you must upgrade all the modules in the CoreBuilder 9000 chassis,

including the EME module, to major software Release 3.0. You cannot

run Release 3.0 software on some modules and not on other modules.

See Table 1 in this chapter for more information about the software

version that each CoreBuilder 9000 component requires.

The EMC boot file remains at software Release 2.1.0.

8

C

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1: O

VERVIEW

See “Installation and Upgrade Prerequisites”, in Chapter 4 “Software

Installation”, for information about how to determine the software

release on each module in the chassis.

CAUTION:

Before you attempt to download any module software, save

the configuration file for the release that you are currently running to an

external device using the EME

upload

command. See the

CoreBuilder 9000 Enterprise Management Engine User Guide

for an

explanation of how to use the EME

upload

command.

Supported Modules

Software Release 3.0 applies to the following 3Com CoreBuilder 9000

Layer 2 switching modules:

■

20-port 10/100BASE-TX Fast Ethernet Layer 2 Switching Module

(Model Number 3CB9LF20R)

■

36-port 10/100BASE-TX Fast Ethernet RJ-45 Layer 2 Switching Module

(Model Number 3CB9LF36R)

■

36-port 10/100BASE-TX Fast Ethernet Telco Layer 2 Switching Module

(Model Number 3CB9LF36T)

■

36-port 10/100BASE-TX Desktop Switching Module (RJ-45

Connectors) (Model Number 3CB9LF36RL)

■

36-port 10/100BASE-TX Desktop Switching Module (RJ-21 Telco

Connectors) (Model Number 3CB9LF36TL)

■

10-port 100BASE-FX Fast Ethernet Layer 2 Switching Module

(Model Number 3CB9LF10MC)

■

20-port 100BASE-FX (MT-RJ) Fast Ethernet Layer 2 Switching Module

(Model Number 3CB9LF20MM)

■

9-port 1000BASE-SX Gigabit Ethernet Layer 2 Switching Module

(Model Number 3CB9LG9MC)

These Fast Ethernet and Gigabit Ethernet Layer 2 switching modules are

intelligent LAN interface modules with embedded management agents

that support standard Simple Network Management Protocol (SNMP)

Management Information Bases (MIBs).

System Requirements

9

System

Requirements

Each CoreBuilder 9000 Enterprise Switch has these minimum system

requirements:

■

One switch fabric module installed in the CoreBuilder 9000 chassis

with appropriate software:

■

For all CoreBuilder 9000 chassis: One 24-port Gigabit Ethernet

Switch Fabric Module (Model Number 3CB9FG24 or Model

Number 3CB9FG24T)

■

For the 7-slot chassis and 8-slot chassis: One 9-port Gigabit

Ethernet Switch Fabric Module (Model Number 3CB9FG9)

■

One Enterprise Management Engine (Model Number 3CB9EME)

installed in the CoreBuilder 9000 chassis with appropriate software

Boot Code and

Operational Code

Table 1 lists the minimum compatible software releases for the switch

fabric modules and management modules that are required for operation

with any Fast Ethernet or Gigabit Ethernet Layer 2 switching module that

has software Release 3.0 installed.

CAUTION:

Except for the EMC boot file, you must update all module

software to Release 3.0.

Ta b l e 1

Software Compatibility Requirements for Layer 2 Switching Modules

Module Name Model Number

Minimum Software

Requirements

Filename

20-port 10/100BASE-TX Fast Ethernet

Layer 2 Switching Module

3CB9LF20R 3.0.0 lf20r30000.all

36-port 10/100BASE-TX Fast Ethernet

RJ-45 Layer 2 Switching Module

3CB9LF36R 3.0.0 lf36r30000.all

36-port 10/100BASE-TX Fast Ethernet

Telco Layer 2 Switching Module

3CB9LF36T 3.0.0 lf36t30000.all

36-port 10/100BASE-TX Desktop

Switching Module (RJ-45 Connectors)

3CB9LF36RL 3.0.0 lf36rtl30000.all

36-port 10/100BASE-TX Desktop

Switching Module (RJ-21 Telco

Connectors)

3CB9LF36TL 3.0.0 lf36rtl30000.all

10-port 100BASE-FX Fast Ethernet

Layer 2 Switching Module

3CB9LF10MC 3.0.0 lf10mc30000.all

20-port 100BASE-FX (MT-RJ) Fast

Ethernet Layer 2 Switching Module

3CB9LF20MM 3.0.0 lf20mm30000.all

10

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1: O

VERVIEW

Optional Switch

Fabric Module

Redundancy

In the CoreBuilder 9000 8-slot chassis and 16-slot chassis, you can install

a second Gigabit Ethernet Switch Fabric Module for redundancy.

CAUTION:

If you install a second Gigabit Ethernet Switch Fabric Module

for redundancy, it must be the identical type of module as the one that is

currently installed. For more information about switch fabric module

redundancy, see the

9-Port Gigabit Ethernet Switch Fabric Module Quick

Start Guide for the CoreBuilder 9000 Enterprise Switch

, and the

24-Port

Gigabit Ethernet Switch Fabric Module Quick Start Guide for the

CoreBuilder 9000 Enterprise Switch

.

Optional

Management

Redundancy

The required Enterprise Management Engine (EME) provides both

management and controller functions in the chassis. To have redundant

management and controller functions in any chassis type (7-slot chassis,

8-slot chassis, and 16-slot chassis), install a second EME. To have only

redundant controller functions in any chassis type, install an Enterprise

Management Controller (EMC).

9-port 1000BASE-SX Gigabit Ethernet

Layer 2 Switching Module

3CB9LG9MC 3.0.0 lg9mc30000.all

24-port Gigabit Ethernet Switch Fabric

Module, 4 trunks

3CB9FG24 3.0.0 fga2430000.all

24-port Gigabit Ethernet Switch Fabric

Module, 12 trunks

3CB9FG24T 3.0.1 fga24t30001.all

9-port Gigabit Ethernet Switch Fabric

Module

3CB9FG9 3.0.1 fg930001.all

Enterprise Management Engine (EME) 3CB9EME Management boot code 3.0.0

Management operational code

3.0.0

eme30000.bt

eme30000.op

Controller boot code 2.1.0

Controller operational code 3.0.0

emcv20100.bt

emc30000.op

Enterprise Management Controller

(EMC)

3CB9EMC Controller boot code 2.1.0

Controller operational code 3.0.0

emcv20100.bt

emc30000.op

Ta b l e 1

Software Compatibility Requirements for Layer 2 Switching Modules (continued)

Module Name Model Number

Minimum Software

Requirements

Filename

2

R

ELEASE

H

IGHLIGHTS

Software Release 3.0 includes the following changes:

■

Web-based Management

■

ISO Date and Time Format

■

New Modules

■

IGMP

■

10/100 Mbps Ethernet Port Monitoring

■

RMON Monitoring Applications

■

802.1p CoS

■

Loop Detection

■

Bridge Address Learning Limits

■

Secure Address Learning Mode

■

Configuring One Untagged System VLAN

■

Broadcast, Multicast, and Flood Rate Limiting

12

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ELEASE

H

IGHLIGHTS

Web-based

Management

Software Release 3.0 supports the Web Management suite of features,

which consists of embedded Web Management applications and

installable tools:

■

Embedded Web Management applications

— Use the embedded

Web Management applications, which are part of the system software

image, for most of your device configuration and management tasks.

You can manage a single port or device, or, using multiple windows,

you can manage multiple devices. This software contains:

■

WebConsole

— An HTML-based set of configuration forms.

■

DeviceView

— A Java-based application that displays a real-time

image of the device. You can manage each port or module, or the

entire system, by clicking the part of the image that you want to

manage.

■

Help

— Access to the configuration form on which you set up the

installable Help, as well as access to links to support information on

the 3Com Web site.

■

Installable tools

— The following optional tools are available from

the

Software CD

:

■

DeviceView accessories

— To set up e-mail notification for

Status Logging.

■

WebManage Framework

— To group your access links to the

devices that you manage.

■

Filter Builder

— To create filters for packets on your Layer 3

switching modules only.

■

Form-specific Help

— To access hypertext information about the

fields in the WebConsole and DeviceView applications.

For information about how to install and use the Web Management

applications, see the

Web Management User Guide for the

CoreBuilder 9000 Enterprise Switch

.

ISO Date and Time Format

13

ISO Date and Time

Format

The format for date and time has changed for Release 3.0 to the

following syntax and now complies with ISO 8601:

YYYY-MM-DDThh:mm:ss

Example:

2000-02-05T03:25:34

New Modules

Software Release 3.0 supports the following new modules:

■

The 20-port 100BASE-FX (MT-RJ) Fast Ethernet Layer 2 Switching

Module (Model Number 3CB9LF20MM). The module has twenty 100

Mbps Ethernet fiber-optic ports with MT-RJ connectors on its front

panel and two 1-Gigabit port for connection to the chassis backplane.

It occupies a single interface module slot in the CoreBuilder 9000

7-slot, 8-slot, and 16-slot chassis.

■

The 36-port 10/100BASE-TX Desktop Switching Module (RJ-45

Connectors) (Model Number 3CB9LF36RL). The module has thirty-six

10/100 Mbps Ethernet ports with RJ-45 connectors on the front panel

and one 1-Gigabit port for connection to the chassis backplane. It

occupies a single interface module slot in the CoreBuilder 9000 7-slot,

8-slot, and 16-slot chassis.

■

The 36-port 10/100BASE-TX Desktop Switching Module (RJ-21 Telco

Connectors) (Model Number 3CB9LF36TL). The module has three

RJ-21 connectors on the front panel. Each RJ-21 connector contains

12 switched 10/100 Mbps Ethernet ports, for a total of 36 switched

ports. The module has one 1-Gigabit port for connection to the

chassis backplane. It occupies a single interface module slot in the

CoreBuilder 9000 7-slot, 8-slot, and 16-slot chassis.

Ta b l e 2

Date and Time

Format Description

YYYY Year (1999 – 2098)

MM Month (01 – 12)

DD Day (01 – 31)

T Time designator (the literal character “T”)

hh Hour (00 – 24)

mm Minute (00 – 59)

ss Second (00 – 59)

14

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H

IGHLIGHTS

IGMP

The Internet Group Management Protocol (IGMP) ensures that multicast

traffic is forwarded from the local router to multicast group members on

directly attached subnetworks. The Snooping function monitors IGMP

packets to ensure that multicast traffic is

only

forwarded to areas of the

network that contain multicast group members. Unlike the Distance

Vector Multicast Routing Protocol (DVMRP), IGMP functions do not relate

to multicast packet delivery between routers. IGMP functions include:

■

Querying

■

Snooping

10/100 Mbps

Ethernet Port

Monitoring

This feature, which is enabled by default, is designed to:

■

Monitor 10/100 Mbps Ethernet ports for excessive collisions, multiple

collisions, late collisions, runts, and FCS errors.

■

Compare these error counters against predetermined thresholds.

■

Disable a port that reaches an error threshold.

■

Report the reason that a port is disabled to the Administration

Console, MIB databases, and SNMP traps.

■

Reenable the port after an initial backoff time interval.

■

Continue monitoring.

See “Port Monitoring” in Chapter 5 “Ethernet” in the

CoreBuilder 9000

Implementation Guide

for information about the new Ethernet port

monitoring feature.

RMON Monitoring Applications

15

RMON Monitoring

Applications

New versions of LANsentry

®

Manager are being released. You can use

LANsentry Manager to monitor traffic and error rates for hosts on a

network, along with traffic flows between these hosts. When you set up

LANsentry Manager with the CoreBuilder 9000, take these factors into

consideration:

■

To access a CoreBuilder 9000 module, use the community string plus

extension format as follows:

For switch fabric modules use this format:

<community string>@fabric

For example, to access a module in slot 4 using the read/write

community string of “private”, enter

private@slot_4.1

■

If you have any problems connecting to the CoreBuilder 9000 using

LANsentry Manager, increase the SNMP timeout values.

See “Remote Monitoring (RMON)” in Chapter 21”Device Monitoring” of

the

CoreBuilder 9000 Implementation Guide

for more details.

802.1p CoS

802.1p Class of Service (CoS) focuses on traffic class and dynamic

multicast filtering services in bridged LANs. It addresses separate queuing

of time-critical frames to reduce the jitter caused by multicast flooding.

802.1p uses the same tag format as 802.1Q, but uses three additional

bits of the tag control information for setting a user priority level.

Loop Detection

The 36-port 10/100BASE-TX Desktop Switching Modules (Model

Numbers 3CB9LF36RL and 3CB9LF36TL) recognize Spanning Tree packets

but these modules do not participate in Spanning Tree. Instead, the

modules can implement a separate loop-detection algorithm on all of

their front-panel ports.

This algorithm acts only on the 36-port 10/100BASE-TX Desktop

Switching Module front-panel ports, and does not act on other Layer 2

modules in the CoreBuilder 9000 system.

16

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H

IGHLIGHTS

You configure the front-panel ports to participate in this algorithm using

three options in the

bridge loopdetectmode

menu:

■

disable

— This default setting disables the module’s port-based

algorithm.

■

enable

— When you configure the module using the

bridge

loopdetectmode enable

option, the module searches for traffic

loops by comparing Spanning Tree Bridge Protocol Data Unit (BPDU)

packets that enter its backplane port with BPDU packets that enter its

front-panel ports. If the module detects the same BPDU packet

coming through both its backplane port and any front-panel port, the

module:

■

Disables the front-panel port where the BPDU packet entered.

■

Sends a trap to the EME.

■

Displays

loop detect

for the port status in the

bridge port summary

and

bridge port detail

displays.

■

immediate

— When you configure the module using the

bridge

loopdetectmode immediate

option, the module searches for

any Spanning Tree BPDU packets that are received on its front-panel

ports. If the module detects that a BPDU packet is received on any

front-panel port, the module:

■

Disables the front-panel port where the BPDU packet entered.

■

Sends a trap to the EME.

■

Displays

bpdu detect

for the port status in the

bridge port summary

and

bridge port detail

displays.

Loop Detection

17

When the module disables a front-panel port to eliminate a loop, you

must bring the port back online manually.

Example:

CB9000@slot 5.1 [36L-E/FEN-TX-L2] (): bridge

Menu options (CoreBuilder 9000-10AD6C):

----------------------------------------

display - Display bridge information

agingTime - Set the bridge address aging time

cos - Administer COS priority queues

port - Administer bridge ports

multicast - Administer multicast filtering

vlan - Administer VLANs

loopDetectMode - Set Loop Detect mode

learnMode - Set the bridge learning mode

CB9000@slot 1.1 [36L-E/FEN-TX-L2] (bridge): loopdetectmode

Enter new value (disable,enable,immediate) [disable]: enable

CB9000@slot 1.1 [36L-E/FEN-TX-L2] (bridge): display

agingTime mode addrTableSize

300 bridgeRepeater 138

addressCount peakAddrCount learnMode

2 4 normal

multicastLimit broadcastLimit floodLimit

50000 50000 50000

loopDetectMode loopDetectSrcAddress

enable 08-00-8f-75-48-86

CB9000@slot 1.1 [36L-E/FEN-TX-L2] (bridge/port): summary 1

rxFrames rxDiscards txFrames

5301100 0 2688802

portNumber loopDetectStatus

1 loop detect

learnStatus addressLimit

active 4

18

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CB9000@slot 1.1 [36L-E/FEN-TX-L2] (bridge/port): detail 1

rxFrames rxSameSegDiscs

5301100 0

rxNoDestDiscs rxErrorDiscs rxMcastLimitType

0 0 BcastOnly

rxMcastLimit rxMcastExcDiscs rxMcastExceeds

4000 0 0

rxSecurityDiscs rxOtherDiscs rxForwardUcasts

0 0 13202

rxFloodUcasts rxForwardMcasts txFrames

0 2675600 2688802

portNumber loopDetectStatus learnStatus

1 loop detect active

addressLimit

4

Bridge Address Learning Limits

19

Bridge Address

Learning Limits

By default, the 36-port 10/100BASE-TX Desktop Switching Modules

(Model Numbers 3CB9LF36RL and 3CB9LF36TL) support two bridging

addresses (learned plus static) per front-panel port. You can manually

change this limit to a value from 1 through 36 addresses per port.

There is also a

module-wide

limit of 138 address-table entries, which is

allocated as follows:

■

72 learned plus static addresses for the module’s front-panel ports

■

36 addresses are a guaranteed allocation of one static address per

port.

■

36 addresses are a pool of free addresses for all ports to use.

If you use the default limit of

two

bridging addresses per port, the

entire module is still restricted to a total of 72 learned and static

addresses.

However, for example, if you change the learning limit to 4 addresses

per port, 1 address is guaranteed per port and 3 addresses come from

the pool of 36 free addresses that all ports can use. Therefore, if 12

ports each learn 4 addresses and a 13th port learns 2 addresses, the

module limit is exceeded because the 36-port pool of free addresses is

exceeded.

■

2 addresses for the module’s CPU

■

64 multicast addresses for the IGMP protocol

If a port exceeds its individual address limit, the module:

■

Disables the port.

■

Sends a trap to the EME.

■

Displays

limitationsExceeded

for the learn status in the

bridge port summary

and

bridge port detail

displays.

If an address coming into a port causes the module’s learned address limit

to be exceeded, the module:

■

Disables the port.

■

Sends a trap to the EME.

■

Displays

moduleLimitationsExceeded

for the learn status in

the

bridge port summary

and

bridge port detail

displays.

20

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H

IGHLIGHTS

If the module disables a front-panel port, you must bring the port back

online manually.

The following example shows how to specify a maximum of six bridging

addresses on port 1:

CB9000@slot 5.1 [36L-E/FEN-TX-L2] (): bridge

Menu options (CoreBuilder 9000-10AD6C):

----------------------------------------

display - Display bridge information

agingTime - Set the bridge address aging time

cos - Administer COS priority queues

port - Administer bridge ports

multicast - Administer multicast filtering

vlan - Administer VLANs

loopDetectMode - Set Loop Detect mode

learnMode - Set the bridge learning mode

CB9000@slot 5.1 [36L-E/FEN-TX-L2] (bridge): port

Menu options (CoreBuilder 9000-10AD6C):

----------------------------------------

summary - Display summary information

detail - Display detailed information

multicastLimit - Set the multicast/broadcast packet rate

limit

multicastLimitMode - Set the Multicast Limit mode for a port

broadcastLimitMode - Set the Broadcast Limit mode for a port

floodLimitMode - Set the Unknown Flood Limit mode for a port

address - Administer bridge addresses

addressLimit - Set the port address limit

CB9000@slot 5.1 [36L-E/FEN-TX-L2] (bridge/port): addresslimit

Select bridge ports (1-36|all|?): 1

Enter address limit (1-36) [4]: 6

Secure Address

Learning Mode

The 36-port 10/100BASE-TX Desktop Switching Modules (Model

Numbers 3CB9LF36RL and 3CB9LF36TL) can use static addresses to admit

or stop packets that arrive at selected front-panel ports. These static

addresses are taken from the per-port address allocations and

module-wide limits. (For more details about these allocations and limits,

see the previous section ”Bridge Address Learning Limits”.)

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