3com 3CB9LF20R User manual

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Software manuals
Type
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
Copyright © 2000, 3Com Corporation. All rights reserved. No part of this documentation may be reproduced
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
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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
C
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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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2: R
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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ELEASE
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:
<community string>@slot_<slot>.<subslot>
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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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
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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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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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3com 3CB9LF20R User manual

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