3Com Computer Hardware 5000 ATM User Manual

®
CoreBuilder 5000 ATM  
®
Backbone SwitchModule  
User Guide  
http://www.3com.com  
Part Number 10013037  
Published November 1999  
 
Bridge Configuration 3-6  
Configuration Defaults 3-7  
Configuring LAN Emulation Parameters 3-8  
Automatic Bridgeport-LEC Configuration  
Manual Bridgeport-LEC Configuration  
Verifying Bridgeport-LEC Status 3-9  
Configuring ATM OC-3 Card Redundancy 3-9  
Configuring IGMP Snooping Parameters 3-10  
SHOW BRIDGE_PORT 4-6  
Displaying General Status Information 4-6  
Displaying Detailed Information 4-7  
SHOW COUNTER BRIDGE_PORT 4-8  
SHOW ATM 4-9  
 
BPORT_LEC Configuration 4-14  
Using Graphical Interface Tools 4-20  
CoreBuilder 5000 Manager 4-20  
VLAN Manager 4-21  
LANE Manager 4-21  
SNOOPING  
Overview 5-1  
CoreBuilder 5000 Support 5-6  
Locating Multicast Routers in the Network 5-6  
No Multicast Routers on the Network 5-6  
 
Verifying Data Movement 6-11  
Resetting the ATM Backbone SwitchModule 6-12  
Using the Reset Button 6-12  
Obtaining Technical Assistance 6-13  
A SPECIFICATIONS  
Environmental Specifications A-1  
Mechanical Specifications A-1  
Power Specifications A-2  
ATM OC-3 Card Fiber Optic Specifications A-2  
 
Access by Digital Modem B-3  
3Com Facts Automated Fax Service B-3  
Support from 3Com B-3  
Returning Products for Repair B-5  
INDEX  
3COM CORPORATION LIMITED WARRANTY  
 
1-1 ATM Backbone SwitchModule Hardware Components 1-4  
1-2 ATM Backbone SwitchModule Base Configuration 1-6  
1-3 ATM Backbone SwitchModule with Redundant ATM OC-3 Card 1-7  
1-4 Example Base Configuration 1-10  
1-5 Example Dual-Homing Configuration 1-11  
1-6 Example Dual-Homing/Module Redundancy Configuration 1-12  
2-1 LAN Emulation Function 2-2  
2-2 ATM Backbone SwitchModule Function 2-2  
2-3 General LAN Emulation Components 2-3  
2-4 ATM Backbone SwitchModule LANE Components 2-4  
2-5 LAN Emulation Protocol Stacks 2-5  
2-6 Converting SwitchModule Packets to and from ATM Cells 2-6  
2-7 Control VCCs in ATM Backbone SwitchModule LAN Emulation 2-7  
2-8 Data VCCs in ATM Backbone SwitchModule LAN Emulation 2-8  
3-1 UNIX Tools for Configuring ATM Backbone SwitchModules 3-3  
3-2 Windows Tools for Configuring ATM Backbone SwitchModules 3-4  
5-1 Multicast Packet Path before Snooping 5-3  
5-2 Format of an IGMP Version 1 Message 5-4  
5-3 Multicast Packet Path after Snooping 5-4  
5-4 FTE DRAM Address Forwarding Entry 5-8  
 
 
1
Notice Icons 2  
Text Conventions 2  
1-1 Supported Standards and MIBs 1-4  
1-2 SwitchModule Installation Per Backplane 1-8  
4-1 Other Vbridge IGMP Snooping Options 4-4  
6-1 Base Module LED Status 6-2  
6-2 Base Module LED Corrective Actions 6-3  
A-1 Environmental Specifications A-1  
A-2 Mechanical Specifications A-1  
A-3 Power Specifications A-2  
A-4 ATM Backbone SwitchModule Fiber Optic Specifications A-2  
 
 
ABOUT THIS GUIDE  
Introduction  
Audience  
This guide describes how to install, configure, and manage the 3Com  
CoreBuilder 5000 ATM Backbone SwitchModule.  
®
If the information in the release notes shipped with your product differs  
from the information in this guide, follow the release note instructions.  
This guide is intended for the following people at your site:  
Network manager or administrator  
Trained hardware installer or service personnel  
How to Use This  
Guide  
The following table shows the location of specific information:  
If you are looking for:  
Tur n to:  
ATM Backbone SwitchModule features, descriptions, and example Chapter 1  
configurations  
An overview of LAN Emulation concepts, components, and  
operation  
Chapter 2  
Information on configuring ATM Backbone SwitchModules  
Chapter 3  
Chapter 4  
Information on monitoring ATM Backbone SwitchModule  
operation  
Information about Information Group Management Protocol  
(IGMP) snooping  
Chapter 5  
Chapter 6  
Information on troubleshooting ATM Backbone SwitchModule  
LEDs, management problems, and resetting ATM Backbone  
SwitchModules  
Detailed ATM Backbone SwitchModule specifications  
3Com technical support information  
Appendix A  
Appendix B  
 
         
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Conventions  
The following tables list conventions used throughout this guide:  
Notice Icons  
Table 1  
Icon  
Type  
Description  
Information Note Information notes call attention to important features  
or instructions.  
Caution  
Cautions alert you to personal safety risk, system  
damage, or loss of data.  
Warning  
Warnings alert you to the risk of severe personal injury.  
Text Conventions  
Table 2  
Convention  
Description  
Enter vs. Type  
When the word enter is used in this guide, it means type  
something, then press the Return or Enter key. Do not  
press the Return or Enter key when instructed to type.  
Syntax vs. Command  
Syntax indicates that the general form of a command  
syntax is provided. You must evaluate the syntax and  
supply the appropriate port, path, value, address, or  
string. For example:  
Enable RIPIP by using the following syntax:  
SETDefault !<port> -RIPIP CONTrol =  
Listen  
In this example, you must supply a port number for  
!<port>.  
Command indicates that all variables in the command  
have been supplied and you can enter the command as  
shown in text. For example:  
Remove the IP address by entering the following  
command:  
SETDefault !0 -IP NETaddr = 0.0.0.0  
For consistency and clarity, the full-form syntax (upper-  
and lowercase letters) is provided. However, you can  
enter the abbreviated form of a command by typing only  
the uppercase portion and supplying the appropriate  
port, path, address, value, and so on. You can enter the  
command in either upper- or lowercase letters at the  
prompt.  
 
 
Related Documents  
3
Text Conventions (continued)  
Table 2  
Convention  
Description  
Text represented as  
screen display  
This typeface is used to represent displays that  
appear on your terminal screen. For example:  
NetLogin:  
Text represented as  
commands  
This typeface is used to represent commands that  
you enter. For example:  
SETDefault !0 -IP NETaddr = 0.0.0.0  
Keys  
Specific keys are referred to in the text as Return key or  
Escape key, or they may be shown as [Return] or [Esc].  
If two or more keys are to be pressed simultaneously, the  
keys are linked with a plus sign (+). For example:  
Press [Ctrl]+[Alt]+[Del].  
Italics  
Italics are used to denote new terms or emphasis.  
Related Documents  
This section provides information on supporting documentation,  
including:  
3Com Documents  
Reference Documents  
3Com Documents The following documents provide additional information on 3Com  
products:  
CoreBuilder 5000 SwitchModule User Guide — Provides information  
on the installation, configuration, operation, and troubleshooting of  
CoreBuilder 5000 SwitchModules.  
CoreBuilder 5000 ATM Backbone SwitchModule Quick Start and  
Reference — Provides information on the installation and basic  
configuration of CoreBuilder 5000 ATM Backbone SwitchModules.  
CoreBuilder 5000 ATM Backbone SwitchModule Command  
Reference — Provides a summarized list of DMM/ADMM commands  
and parameters that apply to the ATM Backbone SwitchModule.  
Redundant ATM OC-3 Card Installation Instructions — Provides  
instructions for installing the redundant ATM OC-3 card on the ATM  
Backbone SwitchModule.  
 
   
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CoreBuilder 5000 Integrated System Hub Installation and  
Operation Guide — Provides information on the installation,  
operation, and configuration of the CoreBuilder 5000 Integrated  
System Hub. This guide also describes the principal features of the  
CoreBuilder 5000 Fault-Tolerant Controller Module.  
CoreBuilder 5000 Distributed Management Module User Guide —  
Provides information on the CoreBuilder 5000 Distributed Management  
Modules operation, installation, and configuration. This guide also  
describes the software commands associated with the Distributed  
Management Module.  
CoreBuilder 5000 Distributed Management Module Commands  
Guide — Describes each management command by providing details  
For a complete list of 3Com documents, contact your network supplier.  
Reference Documents This section includes the following types of reference documents:  
SNMP and MIB-Based Information  
ATM and LAN Documents  
SNMP and MIB-Based The following documents supply related background information on  
Information SNMP and networking protocols:  
Case, J., Fedor, M., Schoffstall, M., and J. Davin, The Simple  
Network Management Protocol, RFC 1157, University of Tennessee at  
Knoxville, Performance Systems International and the MIT Laboratory  
for Computer Science, May 1990.  
Rose, M., and K. McCloghrie, Structure and Identification of  
Management Information for TCP/IP-based Internets, RFC 1155,  
Performance Systems International and Hughes LAN Systems,  
May 1990.  
Rose, M. and McCloghrie, K., Management Information Base for  
Network Management of TCP/IP-Based Internets: MIB-II, RFC 1213,  
Performance Systems International and Hughes LAN Systems, March  
1991.  
Decker, E., Langille, P., McCloghrie, K., and Rijsinghani, A.,  
Definitions of Managed Objects for Bridges, RFC 1493, Cisco Systems,  
Inc., Digital Equipment Corporation, and Hughes LAN Systems, July  
1993.  
 
   
Related Documents  
5
Kastenholz, F. and McCloghrie, K., Evolution of the Interfaces  
Group of MIB-II, RFC 1573, FTP Software and Hughes LAN Systems,  
January 1994.  
Brown, T. and Tesink, K., Definitions of Managed Objects for the  
SONET/SDH Interface Type, RFC 1595, Bell Communications Research,  
March 1994.  
Ahmed, M. and Tesink, K., Definitions of Managed Objects for ATM  
Management Version 8.0 using SMIv2, RFC 1695, Bell  
Communications Research, August 1994.  
LAN Emulation Client Management Specification v1.0, 0038.000,  
ATM Forum, September 1995.  
ATM and LAN The following documents provide information on ATM and LAN  
Documents Emulation technology and specifications:  
LAN Emulation Over ATM: Version 1.0 Specification, 0021.000, ATM  
Forum, January 1995.  
LAN Emulation Over ATM: Version 1.0 Addendum, 0050.000, ATM  
Forum, January 1996.  
ATM User-Network Interface Specification Version 3.0  
©1993 The ATM Forum. Pub. Prentice-Hall, Inc.  
ITU-TS draft Recommendation Q.93B “B-ISDN User-Network Interface  
Layer 3 for Basic Call/Bearer Control” May 1993.  
ITU Document DT/11/3-28 (Q.SAAL1) “Service Specific Connection  
Oriented Protocol (SSCOP) Specification” May 17 1993, Geneva.  
ITU Document DT/11/3-XX (Q.SAAL2) “Service Specific Connection  
Oriented Protocol (SSCOP) Specification” May 17 1993, Geneva.  
ATM User-Network Interface Specification Version 3.1  
©1994 The ATM Forum  
ITU-T draft Recommendation Q.2931 “B-ISDN User-Network Interface  
Layer 3 for Basic Call/Bearer Control” March 1994.  
ITU-T Recommendation Q.2110 BISDN — ATM Adaptation Layer —  
Service Specific Connection Oriented Protocol (SSCOP).  
 
 
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INTRODUCTION  
1
ATM Backbone SwitchModule Architecture  
ATM Backbone SwitchModule Descriptions  
PacketChannel Backplane Description  
Sample ATM Backbone SwitchModule Configurations  
ATM Backbone  
SwitchModule  
Overview  
CoreBuilder 5000 ATM Backbone SwitchModules are high-performance  
System Hub.  
This section describes:  
ATM Backbone SwitchModule Features  
Supported CoreBuilder 5000 SwitchModules  
Supported Management Standards  
ATM Backbone ATM Backbone SwitchModules provide the following features.  
SwitchModule  
Seamless ATM Migration  
Features  
The ATM Backbone SwitchModule protects your investment in LAN  
equipment, wiring, and software by providing seamless LAN-to-ATM  
communication. You can connect existing Ethernet, Fast Ethernet, and  
FDDI legacy LANs with 155 Mbps ATM backbones.  
 
             
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Multiple Redundancy Levels  
You can configure the ATM Backbone SwitchModule for two levels of  
redundancy:  
PHY Redundancy — A secondary ATM OC-3 card provides PHY  
redundancy. If the primary ATM OC-3 card or attached cable fails or  
performance fails or is no longer receiving light, the redundant ATM  
OC-3 card becomes active to maintain operations, if PHY switchover  
is enabled.  
Module Redundancy — Adding a second ATM Backbone  
SwitchModule to the CoreBuilder 5000 hub in a dual-homing  
configuration allows you to load-balance ATM requirements while  
providing automatic module failover if one of the modules fails.  
ATM Forum Specification Compliance  
The ATM Backbone SwitchModule is fully compliant with the following  
ATM Forum specifications:  
UNI 3.0/3.1  
LANE 1.0  
CoreBuilder 5000 Chassis Compatibility  
You can install and operate the ATM Backbone SwitchModule in any  
CoreBuilder 5000 17-slot, 10-slot, or 7-slot chassis that contains a  
PacketChannel backplane.  
Switched Virtual Circuit Capacity  
Each ATM Backbone SwitchModule supports up to 512 simultaneous  
switched virtual circuit (SVC) connections.  
Emulated LAN (ELAN) Capacity  
Each ATM Backbone SwitchModule provides up to 64 LAN Emulation  
Clients (LECs) for connection to 64 Emulated LANs (ELANs). These  
®
virtual LANs can be managed using the 3Com Transcend Enterprise  
VLAN Manager (v4.1 or later), a graphical interface tool that greatly  
simplifies the management of virtual and emulated LANs.  
 
               
ATM Backbone SwitchModule Overview 1-3  
Hot Swap Feature  
You can insert or remove ATM Backbone SwitchModules without  
powering off the CoreBuilder 5000 chassis.  
Supported CoreBuilder 5000 ATM Backbone SwitchModules provide ATM  
CoreBuilder 5000 connectivity for the following CoreBuilder 5000 SwitchModules:  
SwitchModules  
2-Port DAS FDDI SwitchModule (3C96604M-F)  
2-Port DAS FDDI SwitchModule (3C96604M-F-A)  
4-Port 100BASE-FX SwitchModule (3C96604M-FX-A)  
4-Port 100BASE-TX SwitchModule (3C96604M-TX-A)  
10-Port 10BASE-F SwitchModule (3C96610M-F-ST)  
10-Port 10BASE-F-A SwitchModule (3C96610M-F-A)  
FDDI CONC (MIC) (3C96612M-FC-A)  
10-Port 10BASE-T/DAS FDDI SwitchModule (3C96612M-FF-A)  
12-Port 10BASE-T SwitchModule (3C96612M-TP)  
12-Port 10BASE-T SwitchModule (3C96612M-TP-A)  
12-Port 10BASE-T/DAS FDDI SwitchModule (3C96614M-FTP-A)  
16-Port Ethernet Backplane SwitchModule (3C96616M-BTP-A)  
18-Port Fast Ethernet 100BASE-T SwitchModule (3C96618M-TX-A)  
20-port 10BASE-F SwitchModule (3C96620M-F-ST)  
20-Port 10BASE-F SwitchModule (3C96620M-F-A)  
20-Port Ethernet 10BASE-T SwitchModule (3C96620M-TP-A)  
24-Port 10BASE-T SwitchModule (3C96624M-TP-A)  
24-Port Telco SwitchModule (3C96624M-TPL-A)  
 
       
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1: I  
Supported CoreBuilder 5000 ATM Backbone SwitchModules support the standards  
Management and MIBs shown in Table 1-1.  
Standards  
Supported Standards and MIBs  
Table 1-1  
Standards  
ATM Forum UNI 3.0/3.1  
ATM Forum LANE 1.0  
IEEE 802.1D (Spanning Tree)  
IEEE 802.1H (Translation)  
IEEE 802.3  
SNMP (RFC 1157)  
MIBs  
Bridge MIB (RFC 1493)  
MIB II (RFC 1213)  
Interfaces MIB (RFC 1573)  
ATM MIB (RFC 1695)  
SONET MIB (RFC 1595)  
ATM Forum LEC MIB  
IANAIFTYPE MIB  
3Com ISD MIB  
ATM Backbone  
SwitchModule  
Architecture  
This section describes the hardware components of the  
CoreBuilder 5000 ATM Backbone SwitchModule.  
Figure 1-1 identifies the significant hardware components of the ATM  
Backbone SwitchModule.  
ATM Backbone SwitchModule  
155Mbps OC-3  
multimode fiber  
LAN Emulation  
Primary ATM  
OC-3 card  
Packet Switch  
Processor  
155Mbps OC-3  
multimode fiber  
CoreBuilder® 5000  
hub PacketChannel  
backplane  
Redundant ATM  
OC-3 card  
Management  
Processor  
ATM Backbone SwitchModule Hardware Components  
Figure 1-1  
 
                                   
ATM Backbone SwitchModule Architecture 1-5  
The significant hardware components of the ATM Backbone  
Management Processor  
Packet Switch Processor  
Primary ATM OC-3 Card  
Redundant ATM OC-3 Card  
Management The Management Processor performs processing functions that are not  
Processor time critical. Its main functions include:  
Network management  
ATM signalling  
ATM LAN emulation client (LEC) functions  
Bridging functions  
Forwarding table maintenance  
Packet Switch The Packet Switch Processor performs time-critical processing functions  
Processor such as packet forwarding.  
Primary ATM OC-3 The primary ATM OC-3 card provides a SONET PHY ATM interface  
Card operating at 155 Mbps on OC-3, multimode fiber over an SC-type  
connector. The maximum distance between links is 2 kilometers.  
Redundant ATM OC-3 The redundant ATM OC-3 card is identical to the primary ATM OC-3  
Card card. It becomes active in place of the primary ATM OC-3 card if any of  
the following characteristics are lost:  
Light  
Frame  
Cell delineation  
ATM signalling  
ILMI (Integrated Local Management interface) channel information  
 
           
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ATM Backbone  
SwitchModule  
Descriptions  
This section describes the base and redundant hardware configurations  
of the ATM Backbone SwitchModule.  
Base Hardware Figure 1-2 shows the ATM Backbone SwitchModule with only the  
Configuration primary ATM OC-3 card installed.  
Base Module (3C96602M-MOD)  
Primary ATM OC-3 card  
included with base  
6602-MOD  
ATM Backbone SwitchModule Base Configuration  
Figure 1-2  
 
         
ATM Backbone SwitchModule Descriptions 1-7  
Redundant Hardware Figure 1-3 shows the ATM Backbone SwitchModule with an optional  
Configuration redundant ATM OC-3 card installed.  
Base Module (3C96602M-MOD)  
includes primary ATM OC-3 card  
Redundant ATMOC-3 card  
(3C96601D-155SC-MM)  
6602-MOD  
ATM Backbone SwitchModule with Redundant ATM OC-3 Card  
®
Figure 1-3  
See the CoreBuilder 5000 ATM Backbone SwitchModule Quick Start  
and Reference for how to install the redundant ATM OC-3 card.  
 
     
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PacketChannel  
Backplane  
Description  
An ATM Backbone SwitchModule installed in the CoreBuilder 5000 hub  
connects to the CoreBuilder 5000 PacketChannel backplane. There are  
two kinds of PacketChannel backplanes:  
Standard PacketChannel — Supports packet-switching. When you  
display hub information, the hub type is listed with the suffix -xP  
(x may be A or B) to identify this backplane, and the backplane type  
is listed as PacketChannel.  
PacketChannel plus ATM Cell-Switching (SwitchChannel) —  
Supports both packet-switching and ATM cell-switching. When you  
display hub information, the hub type is listed with the suffix -xC  
(x may be A or B) to identify this backplane, and the backplane type  
is listed as SwitchChannel.  
Both the PacketChannel backplane and the packet-switching part of  
the SwitchChannel backplane:  
Support LAN-switching technology.  
Switch 3.4 million packets per second.  
Provide a 2 Gigabit-per-second bus.  
Are designed as a passive bus that contains no active components  
that can break down.  
Occupy the third (upper) backplane slot of the CoreBuilder 5000  
hub.  
Slot Restrictions Per Some slot restrictions apply if the hub uses the SwitchChannel  
Backplane backplane or if the hub contains no backplane in the third backplane  
slot. Refer to Table 1-2 for information about ATM Backbone  
SwitchModule installation restrictions and operation.  
SwitchModule Installation Per Backplane  
Table 1-2  
*
CoreBuilder Backplane  
5000 Hub  
Hub Type  
SwitchModule Installation and Operation  
17-Slot  
PacketChannel  
(Part Number 30-0433)  
3C96017C-AP  
3C96017C-BP  
3C96017CH-AP  
Install ATM Backbone SwitchModule in any slot in  
the hub.  
SwitchChannel  
(Part Number 30-0430)  
3C96017C-AC  
3C96017C-BC  
3C96017CH-AC  
Install ATM Backbone SwitchModule in slots 1  
through 8 or 13 through 17.  
 
               
PacketChannel Backplane Description 1-9  
SwitchModule Installation Per Backplane (continued)  
Table 1-2  
*
CoreBuilder Backplane  
5000 Hub  
Hub Type  
SwitchModule Installation and Operation  
10-Slot  
PacketChannel  
(Part Number 30-0432)  
3C96010C-AP  
3C96010C-BP  
3C96010CH-AP  
Install ATM Backbone SwitchModule in any slot in  
the hub.  
SwitchChannel  
(Part Number 30-0434)  
3C96010C-AC  
3C96010C-BC  
3C96010CH-AC  
Install ATM Backbone SwitchModule in slots 1  
through 8.  
7-Slot  
PacketChannel (Part  
Number 30-0471)  
3C96007C-AP  
3C96007C-BP  
3C96007CH-AP  
Install ATM Backbone SwitchModule in any slot in  
the hub.  
17-Slot,  
10-Slot, or  
7-Slot  
No PacketChannel or  
SwitchChannel  
backplane  
3C96017C-A  
3C96017C-B  
3C96010C-A  
3C96010C-B  
3C96007C-A  
3C96007C-B  
Does not support ATM Backbone SwitchModule.  
Contact 3Com Technical Support for information on  
upgrading your CoreBuilder 5000 hub.  
®
* To verify the hub type, enter the DMM command SHOW HUB.  
Refer to the CoreBuilder 5000 Integrated System Hub Installation and  
Operation Guide for more information about CoreBuilder 5000 hub  
backplanes.  
 
   
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Sample ATM  
Backbone  
SwitchModule:  
SwitchModule  
Configurations  
Basic Configuration  
Dual-Homing Configuration  
Dual-Homing/Module Redundancy Configuration  
Basic Configuration Figure 1-4 illustrates the basic configuration of an ATM Backbone  
SwitchModule with only a primary ATM OC-3 card.  
ATM Backbone  
SwitchModule  
Primary  
ATM OC-3  
LECs 1 to 64  
Ethernet or FDDI  
SwitchModule  
ELANs 1 to 64  
ATM Switch  
Example Base Configuration  
Figure 1-4  
See Chapter 2, LAN Emulation Overview, for a description of LAN  
Emulation components and operation.  
 
       
Sample ATM Backbone SwitchModule Configurations 1-11  
Dual-Homing Figure 1-5 illustrates the dual-homing configuration of an ATM  
Configuration Backbone SwitchModule with a redundant ATM OC-3 card.  
ATM Backbone  
SwitchModule  
Primary  
ATM OC-3  
LECs 1 to 64  
Redundant  
ATM OC-3  
LECs 1 to 64  
Ethernet or FDDI  
SwitchModule  
ELANs 1 to 64  
NNI  
ATM Switch A  
ELANs 1 to 64  
ATM Switch B  
Example Dual-Homing Configuration  
Figure 1-5  
If the loss of light, frame, or cell delineation is detected, the redundant  
ATM OC-3 card becomes active and the primary ATM OC-3 card is  
disabled.  
 
     
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Dual-Homing/Module Figure 1-6 illustrates the dual-homing/module redundancy configuration  
Redundancy of two ATM Backbone SwitchModules with redundant ATM OC-3  
Configuration cards.  
ATM Backbone  
SwitchModules  
Ethernet or FDDI  
SwitchModule  
Primary  
ATM OC-3  
LECs 1 to 32  
Primary  
ATM OC-3  
LECs 33 to 64  
Redundant  
ATM OC-3  
LECs 1 to 32  
Redundant  
ATM OC-3  
LECs 33 to 64  
ELANs 1 to 64  
ATM Switch B  
ELANs 1 to 64  
NNI  
ATM Switch A  
Example Dual-Homing/Module Redundancy Configuration  
Figure 1-6  
The LECs in the example configuration of Figure 1-6 can be manually  
distributed between the two ATM Backbone SwitchModules in any  
combination.  
 
     
Sample ATM Backbone SwitchModule Configurations 1-13  
The features of the dual-homing/module redundancy configuration  
include:  
Load balancing  
LEC support is distributed manually across two ATM Backbone  
SwitchModules  
ATM PHY redundancy  
On either ATM Backbone SwitchModule, if the loss of any critical  
function is detected, the redundant ATM OC-3 card becomes active  
and the primary ATM OC-3 card is disabled.  
Module redundancy  
Using spanning tree parameters, one ATM Backbone SwitchModule  
assumes the LEC support of the other ATM Backbone SwitchModule  
if the other ATM Backbone SwitchModule fails.  
Refer to the CoreBuilder 5000 SwitchModule User Guide for  
information on Spanning Tree parameters and configuration  
information.  
 
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LAN EMULATION OVERVIEW  
2
This chapter describes the LAN emulation technology that provides an  
interface between Ethernet and FDDI packet-based networks and ATM  
cell-based networks.  
This chapter contains the following sections:  
LAN Emulation Components  
LAN Emulation Data Exchange  
LAN Emulation Connections  
LAN Emulation Operation  
This chapter provides a general overview of fundamental LAN  
emulation concepts and terminology. For more detailed information on  
LAN emulation, refer to ATM Forum specifications LANE 1.0.  
General Definition  
of LAN Emulation  
LAN Emulation (LANE) provides an interface between traditional LANs  
and ATM networks. LAN emulation is defined by ATM specifications  
LANE 1.0.  
An ATM emulated LAN conforms to IEEE 802.3 for Ethernet LANs.  
The use of LAN emulation bridge allows you to use a high-speed ATM  
backbone to connect existing (legacy) Ethernet LANs. Figure 2-1  
illustrates the basic function of LAN emulation.  
 
       
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MULATION VERVIEW  
LAN emulation (LANE)  
bridges  
Legacy  
LAN  
ATM backbone  
network  
Legacy  
LAN  
LAN Emulation Function  
Figure 2-1  
The ATM Backbone SwitchModule provides a LAN emulation bridge between  
an ATM network and a standard Ethernet-based SwitchModule (Figure 2-2).  
SwitchModule  
ATM  
ATM  
Backbone  
network  
SwitchModule  
Emulated LAN  
(ELAN)  
Virtual Bridge  
(vbridge)  
ATM Backbone SwitchModule Function  
Figure 2-2  
The ATM Backbone SwitchModule accepts Ethernet and FDDI source  
packets from the SwitchModule over the CoreBuilder 5000  
PacketChannel backplane and converts the packets to ATM cells for  
forwarding to the ATM backbone.  
Conversely, ATM cells received by the ATM Backbone SwitchModule  
from the ATM backbone are converted to Ethernet packets and sent  
over the CoreBuilder 5000 PacketChannel backplane to the destination  
SwitchModule.  
 
   
LAN Emulation Components  
2-3  
LAN Emulation  
Components  
This section identifies:  
General LANE Components  
ATM Backbone SwitchModule LANE Components  
General LANE The major components of ATM LAN emulation are identified in  
Components Figure 2-3.  
ATM  
network  
LAN emulation  
LAN Emulation  
bridge with one  
or more LAN  
emulation  
Legacy LANs  
Configuration Server (LECS)  
LAN Emulation  
Server (LES)  
clients (LECs)  
LAN Emulation  
Client (LEC)  
Broadcast and Unknown  
Server (BUS)  
General LAN Emulation Components  
Figure 2-3  
Each of the major LAN emulation components are defined here.  
LAN Emulation Client (LEC)  
The LAN Emulation Client is the entity in an end system that performs  
data forwarding, address resolution, and other control functions for a  
single end-system within a single ELAN. Each LEC is identified by a  
unique ATM address and is assigned to an ELAN in the ATM network.  
LAN Emulation Configuration Server (LECS)  
The LAN Emulation Configuration Server assigns individual LECs to a  
particular emulated LAN (ELAN) by directing them to the LAN emulation  
server that corresponds to the ELAN.  
LAN Emulation Server (LES)  
The LAN Emulation Server implements the control functions for a  
particular ELAN. There is only one logical LES for each ELAN. A LEC that  
belongs to a particular ELAN is controlled by the LES for the ELAN.  
 
             
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Broadcast and Unknown Server (BUS)  
The Broadcast and Unknown Server is a multicast server that forwards  
multicast and broadcast traffic to LECs within a specific ELAN. The BUS  
also floods unknown unicast traffic to all LECs in the ELAN.  
ATM Backbone Implementation of the LAN emulation components in the ATM  
SwitchModule LANE Backbone SwitchModule is illustrated in Figure 2-4.  
Components  
ATM Backbone SwitchModule  
Ethernet or FDDI  
ATM OC-3 card  
SwitchModule  
ATM  
network  
LANE  
service  
Virtual bridge  
(Vbridge)  
Emulated LAN  
(ELAN)  
Bridgeport-LEC  
(up to 64)  
ATM Backbone SwitchModule LANE Components  
Figure 2-4  
In addition to the standard LANE service components (see Figure 2-3),  
the ATM Backbone SwitchModule includes the following components:  
Bridgeport-LEC  
You define up to 64 bridgeport-LECs for each ATM Backbone  
SwitchModule. A bridgeport-LEC is both a standard ATM LEC that you  
assign to an emulated LAN and a bridgeport that you assign to a virtual  
bridge.  
 
       
LAN Emulation Data Exchange  
2-5  
Virtual Bridge (vbridge)  
You create virtual bridges on CoreBuilder 5000 SwitchModules. You  
assign each bridgeport-LEC to a vbridge on a SwitchModule in the  
CoreBuilder 5000 hub.  
Emulated LAN (ELAN)  
You assign each bridgeport-LEC to an ELAN in the ATM network. An  
ELAN is a logical LAN grouping of LECs within an ATM network.  
LAN Emulation  
Data Exchange  
This section identifies important characteristics of data exchange  
between a SwitchModule and an ATM network.  
Protocol Stacks The LAN emulation protocol stacks used in the exchange of data  
between a SwitchModule-based LAN and ATM host are shown in  
Figure 2-5.  
ATM host  
ATM switch  
ATM Backbone SwitchModule  
and Ethernet SwitchModule  
Ethernet/FDDI host  
Existing applications  
Existing applications  
Network interface  
driver  
Network interface  
driver  
Bridging  
LAN  
emulation  
LAN emulation  
MAC  
MAC  
AAL5  
AAL5  
ATM  
ATM  
ATM  
Physical layer  
Physical  
Physical  
Physical layer  
Physical  
Physical  
LAN Emulation Protocol Stacks  
Figure 2-5  
 
             
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Packets Versus Cells The ATM Backbone SwitchModule converts Ethernet- and  
FDDI-originated packets to and from ATM cells.  
Figure 2-6 illustrates the conversion of SwitchModule packets to and  
from ATM cells.  
From  
ATM  
SwitchModule packet  
Padding and  
error correction  
Segmentation/  
Reassembly  
48 Octets  
53 Octets  
48 Octets  
53 Octets  
48 Octets  
Cells  
HDR  
HDR  
HDR  
To ATM  
53 Octets  
HDR = ATM Cell Header (5 octets)  
Converting SwitchModule Packets to and from ATM Cells  
Figure 2-6  
 
     
LAN Emulation Connections 2-7  
LAN Emulation  
Connections  
LAN emulation uses VCCs (virtual channel connections) to provide  
communications between a LEC and the LANE service.  
There are two types of VCCs:  
Control VCCs  
Data VCCs  
Control VCCs Control VCCs consist of the following three types:  
Configuration Direct VCC — A bidirectional point-to-point VCC  
from the LEC to the LECS  
Control Direct VCC — A bidirectional VCC from the LEC to the LES  
Control Distribute VCC — A unidirectional VCC from the LES to  
the LEC; typically, a point-to-multipoint connection from the LES to  
multiple LECs  
Figure 2-7 illustrates the function of the three types of Control VCCs in  
ATM Backbone SwitchModule LAN emulation.  
ATM Backbone  
SwitchModule  
Control Direct VCC  
LAN Emulation Server  
(LES)  
Control Distribute VCC  
Bridgeport-  
LEC  
LAN Emulation  
Configuration Server  
Configuration Direct VCC  
(LECS)  
Control VCCs in ATM Backbone SwitchModule LAN Emulation  
Figure 2-7  
 
         
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MULATION VERVIEW  
Data VCCs Data VCCs consist of the following three types:  
Data Direct VCC — A bidirectional point-to-point VCC set up  
between two LECs that want to exchange data  
Multicast Send VCC — A bidirectional point-to-point VCC between  
the LEC and the BUS  
Multicast Forward VCC — A unidirectional VCC from the BUS to  
the LEC; typically, a point-to-multipoint connection from the BUS to  
multiple LECs  
Figure 2-8 illustrates the function of the three basic types of Data VCCs  
in ATM Backbone SwitchModule LAN emulation.  
ATM Backbone  
Multicast Send VCC  
SwitchModule  
Broadcast and Unknown  
Server  
(BUS)  
Multicast Forward VCC  
Bridgeport-  
LEC  
ATM LEC  
Data Direct VCC  
Data VCCs in ATM Backbone SwitchModule LAN Emulation  
Figure 2-8  
 
   
LAN Emulation Operation 2-9  
LAN Emulation  
Operation  
This section describes the simplified operation of a LEC in a LAN  
emulation configuration. LEC operation is defined by the protocols of  
the LAN Emulation User-Network Interface (LUNI).  
LUNI protocol defines each stage of operation for a LEC. The major  
stages of operation, defined in this section, are:  
Initialization  
Configuration  
Joining  
BUS Connection  
Data Movement  
Initialization In the initial state, the LEC configuration is initialized from nonvolatile  
storage or set to default values.  
The next stage of LEC operation depends on the LANE configuration  
mode of the LEC:  
Manual configuration mode — The LEC proceeds directly to the  
Joining stage and uses a locally configured LES ATM address.  
Automatic configuration mode — The LEC proceeds to the LECS  
Connection stage and attempts to contact the LECS to obtain its  
configuration, including ELAN/LES assignment.  
 
     
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LECS Connection The LEC must determine the ATM address of its LECS and establish a  
connection to the LECS. The LEC attempts each of the following  
methods, in the order provided, to connect to its LECS:  
1 Uses a locally configured LECS ATM address.  
2 Queries the ILMI Service Registry MIB of the attached ATM switch for  
one or more LECS ATM addresses.  
3 Uses a predefined “well-known” LECS ATM address.  
The use of another LANE 1.0 method of LECS connection, a PVC  
(Permanent Virtual Circuit) connection over VPI/VCI 0/17 (Virtual Path  
Identifier/Virtual Circuit Identifier), is not supported by the ATM  
Backbone SwitchModule.  
The LEC proceeds to the Configuration stage when it establishes a  
connection to the LECS.  
Configuration During the configuration stage, the LEC:  
1 Sends a Configuration Request, containing identifying information  
about itself, to the LECS.  
2 Receives a Configuration Response from the LECS containing the ATM  
address of the LES to which the LEC is assigned, as well as emulated  
LAN parameters such as ELAN type, frame size, and ELAN name.  
Joining During the Joining stage, the LEC:  
1 Connects to the LES and sends a Join Request containing LANE  
parameter settings that were locally configured (manual mode) or  
obtained from the LECS (automatic mode).  
2 Receives a Join Response from the LES indicating whether the LEC is  
accepted onto the emulated LAN controlled by that LES.  
 
     
LAN Emulation Operation 2-11  
BUS Connection During the BUS Connection stage, the LEC:  
1 Sends an LE-ARP (LAN Emulation-Address Resolution Protocol) request  
to the LES containing the target MAC address FF-FF-FF-FF-FF-FF  
(broadcast MAC address).  
The LES returns an LE-ARP response containing the ATM address of the  
emulated LANs BUS.  
2 Establishes connections to the BUS for transmitting and receiving  
multicast and unknown unicast traffic.  
Data Movement In the Data Movement stage, the LEC:  
Sends and receives multicast MAC frames over the connections to  
the BUS.  
Sends and receives unknown unicast MAC frames (unicast MAC  
frames for which the corresponding ATM address on the emulated  
LAN is unknown) over the connections to the BUS. At the same  
time, the LEC conducts an LE-ARP exchange to associate the MAC  
address with the ATM address of another station on the  
emulated LAN.  
After a MAC/ATM address binding is resolved using LE-ARP,  
establishes a Data Direct VCC to that ATM address. After the Data  
Direct VCC is set up between two LECs, a Flush request is sent via  
the bus to signal to the receiving LEC to stop sending Data via the  
bus and to start sending data over the established Data Direct VCC.  
The receiving LEC responds with a Flush response via the bus to  
clear the bus channel. Any unicast frames received from the ATM  
address from the time the LEC sends out the Flush request until the  
time it receives the Flush response are buffered. The buffered frames  
are sent out over Data Direct VCC after the LEC receives the Flush  
command instead of over the bus.  
Disconnects a Data Direct VCC that remains idle for a specified  
timeout period.  
 
   
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CONFIGURING THE ATM  
BACKBONE SWITCHMODULE  
3
®
This chapter provides procedures for configuring the CoreBuilder 5000  
Configuration Process Overview  
Configuring LAN Emulation Parameters  
Configuring ATM OC-3 Card Redundancy  
Configuring IGMP Snooping Parameters  
Configuration Tools This section identifies the management tools that are available for you  
to manage CoreBuilder 5000 ATM Backbone SwitchModules. ATM  
Backbone SwitchModule configuration tools include:  
3Com CoreBuilder 5000 Distributed Management Module (DMM)  
(includes Advanced DMM)  
Advanced Management Tools  
 
       
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Distributed The CoreBuilder 5000 Distributed Management Module (DMM) and  
Management Module Advanced DMM (ADMM) provide commands that allow you to  
configure and monitor the ATM Backbone SwitchModule.  
The ATM Backbone SwitchModule requires DMM/ADMM Version v5.20  
or later.  
DMM access to the ATM Backbone SwitchModule is obtained in either  
of two ways:  
Connect a terminal directly to the console port of the DMM  
TELNET to the IP address of the DMM from which the ATM  
Backbone SwitchModule is accessible  
Refer to Setting Up DMM Access later in this chapter for more  
information.  
Advanced This section identifies the advanced management tools that are  
Management Tools available for managing CoreBuilder 5000 ATM Backbone  
SwitchModules, including:  
Transcend Network Control Services for UNIX  
Transcend Network Management Software for Windows  
Third-Party SNMP-Based Tools  
Transcend Network Control Services for UNIX  
®
3Com Transcend Network Control Services for UNIX provides a suite  
of advanced graphical tools for network management. Figure 3-1  
illustrates the Transcend UNIX graphical tools you can use to configure  
CoreBuilder 5000 ATM Backbone SwitchModules.  
 
             
Configuration Tools 3-3  
Operating systems  
SunOS, Solaris, HP  
Network management platforms  
HP OpenView, SunNet Manager  
3Com management  
application  
Transcend® Network Control Services for UNIX  
Tools accessible  
from network management  
platform Tools menu  
CoreBuilder® 5000  
Manager  
Device  
View  
Bridge  
Management  
VLAN  
Manager  
Alternative  
launch point  
Alternative  
launch point  
UNIX Tools for Configuring ATM Backbone SwitchModules  
Figure 3-1  
Transcend Network Control Services for UNIX applications are accessed  
by:  
Selecting the application directly from the Tools menu of the  
network platform (for example, HP OpenView)  
Selecting a launch point from one application to another  
You can access VLAN Manager from the network platform Tools menu  
only.  
Transcend Network Management Software for Windows  
3Com Transcend Network Management Software for Windows provides  
a suite of advanced graphical tools for network management.  
Figure 3-2 illustrates the Transcend Windows tools that you can use to  
configure CoreBuilder 5000 ATM Backbone SwitchModules.  
 
     
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Operating systems  
Windows 95, Windows NT  
HP OpenView for Windows  
Network management platforms  
3Com management  
application  
Transcend® Network Management Software for Windows  
Tools accessible  
from network management  
platform Tools menu  
CoreBuilder® 5000  
Manager  
VLAN  
Manager  
Bridge  
Management  
Alternative  
launch point  
Device View  
(embedded)  
Windows Tools for Configuring ATM Backbone SwitchModules  
Figure 3-2  
Transcend Network Management Software for Windows applications  
are accessed by:  
Selecting the application directly from the Tools menu of the  
Network Platform (for example, HP OpenView)  
Selecting a launch point from one application to another  
You can access VLAN Manager from the Windows NT Tools menu only.  
Third-Party SNMP-Based Tools  
After you set up the DMM access, you can use any SNMP network  
manager for management (if the Management Information Base (MIB)  
is correctly installed on your network management station).  
To manage the ATM Backbone SwitchModule with a network manager  
purchased from another vendor, verify that you have the correct MIB.  
Contact your network supplier for advice.  
 
     
Setting Up DMM Access  
3-5  
Setting Up DMM  
Access  
This section provides procedures you must follow to set up access to  
DMM management tools.  
You can access the DMM by:  
Direct terminal access  
TELNET access  
Setting Up Direct Refer to the CoreBuilder 5000 Distributed Management Module User  
Terminal Access to Guide for procedures to set up a direct terminal connection to the  
the DMM DMM.  
Configuring TELNET You can configure in-band access to the DMM, which allows you to  
Access to the DMM manage the CoreBuilder 5000 hub from a remote terminal or SNMP  
manager such as the 3Com Transcend Network Control Services  
application.  
The CoreBuilder 5000 SwitchModules have embedded network  
connectivity to the DMM across the hub management channel.  
Be sure that TELNET Access to the DMM is established through the  
CoreBuilder 5000 SwitchModule or another module in the hub.  
For procedures on setting up Telnet access to the DMM, see the  
CoreBuilder 5000 SwitchModule User Guide.  
 
         
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Configuration  
Process Overview  
This section provides an overview of the following configuration  
information:  
Configuration Components  
Configuration Defaults  
Configuration ATM Backbone SwitchModule configuration consists of three main  
Components components, described in the following sections:  
LAN Emulation Configuration  
Defines up to 64 LECs (LAN Emulation Clients) and assigns each to a  
unique ELAN. LEC configuration also involves defining various ELAN  
parameters for created LECs.  
Initial LEC configuration requirements are specified in Configuring LAN  
Emulation Parameters later in this document.  
Bridge Configuration  
After it is created, a LEC must be assigned to an existing SwitchModule  
vbridge and can be configured as a normal SwitchModule bridge port,  
except that the SwitchModule never elects a bridgeport-LEC as master  
bridge port.  
See the CoreBuilder 5000 SwitchModule User Guide for more  
information on master bridge ports.  
Initial bridge configuration requirements are specified in Configuring  
LAN Emulation Parameters later in this chapter. For a complete list of  
configurable bridging parameters, see the CoreBuilder 5000  
SwitchModule User Guide.  
 
             
Configuration Process Overview 3-7  
ATM Configuration  
CAUTION: Changes to the ATM parameters can cause problems with  
system operation. Only qualified ATM service personnel should attempt  
to modify these parameters. We recommend that you do not attempt  
to change these parameters.  
Various ATM parameters are available to control ATM operating  
characteristics but, with the exception of the UNI Version parameter,  
ATM parameters typically do not require modification.  
The default UNI Version of the ATM Backbone SwitchModule is 3.0.  
If necessary, use the following command to change the UNI Version to  
match that of the ATM switch:  
CB5000> set atm slot uni_version version  
The valid UNI Version settings are:  
3_0  
3_1  
See the following for more information on ATM configuration:  
ATM Backbone SwitchModule Command Reference for ATM-related  
DMM commands and parameters  
DMM Commands Guide for commands and examples  
ATM Forum specifications UNI 3.0/3.1 and LANE 1.0  
Configuration After installing the ATM, the following default configuration parameters  
Defaults are in effect:  
The number of LECs on the module is set to 8.  
LE_ARP Quiet Time is set to 5 seconds.  
UNI version is set to 3_0.  
LEC 1 is set to the following parameter values:  
Configuration mode is Automatic.  
Interface mode is Enabled.  
ELAN Name is Admin.  
Vbridge assignment is vbridge_1.  
 
       
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LECs 2 through 8 are set to the following parameter values:  
Configuration mode is Manual.  
Interface mode is Disabled.  
ELAN Name is None.  
Vbridge assignment is Unassigned.  
Configuring LAN  
Emulation  
Parameters  
The procedure you use to configure the LAN Emulation parameters for  
a LAN Emulation Client depends on whether the LEC is configured for  
automatic or manual configuration.  
Automatic By default, the configuration mode of LEC 1 of the ATM Backbone  
Bridgeport-LEC SwitchModule is set to Automatic. Upon initial power-on, a LEC that is  
Configuration set to Automatic configuration mode attempts to establish connection  
Mode with the LECS according to established autoconfiguration guidelines.  
Refer to Chapter 2, LAN Emulation Overview, for more information.  
After the automatic bridgeport-LEC configuration is complete, you must  
assign the LEC to a vbridge. Only one bridgeport LEC from the same  
ATM Backbone SwitchModule may be assigned to each virtual bridge.  
In this example, LEC 1 of a ATM Backbone SwitchModule in slot 4 is  
assigned to vbridge 2:  
CB5000>set bridge_port 4.1 vbridge 2  
Before the LEC can exchange data, a bridgeport on the Ethernet or  
FDDI SwitchModule must also be assigned to the vbridge.  
Manual If the module cannot successfully autoconfigure, use the following  
Bridgeport-LEC procedure to manually configure the required initial parameters.  
Configuration  
Mode  
1 Configure initial ATM Backbone SwitchModule parameters using the  
commands in the following example (configuring LEC 1 on a module in  
slot 4):  
CB5000>set bport_lec 4.1 mode disable  
CB5000>set bridge_port 4.1 vbridge 2  
CB5000>set bport_lec 4.1 config_mode manual  
CB5000>set bport_lec 4.1 les_atm_address <address>  
CB5000>set bport_lec 4.1 elan_name <name>(may not be required)  
CB5000>set bport_lec 4.1 mode enable  
 
           
Configuring ATM OC-3 Card Redundancy 3-9  
2 Save the settings as follows:  
CB5000>save all  
3 Repeat steps 1 and 2 for each LEC you require.  
4 Assign a unique LES address for each bridgeport LEC on the same  
module. If a bridgeport LEC has an address configured that is a  
duplicate of another bridgeport LEC, it never joins the ELAN.  
For a complete list of optional DMM LAN Emulation commands and  
parameters, see the ATM Backbone SwitchModule Command  
Reference. For descriptions and examples of the LAN Emulation  
commands, refer to the DMM Commands Guide.  
Verifying After Automatic or Manual LEC configuration, use the SHOW  
Bridgeport-LEC BPORT_LEC STATUS command to verify that the bridgeport-LEC is  
Status successfully joined to the intended ELAN.  
Configuring ATM  
If you install a second ATM OC-3 card on your ATM Backbone  
SwitchModule, use the following procedure to configure the module  
for ATM OC-3 card redundancy:  
OC-3 Card  
Redundancy  
1 Use the following command to designate one of the two ATM OC-3  
cards as the active ATM OC-3 card.  
CB5000> set module <slot>.1 phy_selection <1 or 2>  
The ATM OC-3 card near the top of the ATM Backbone SwitchModule  
is 1. The lower ATM OC-3 card is 2.  
The ATM OC-3 card you do not make active becomes the redundant  
ATM OC-3 card.  
2 Use the following command to enable the ATM Backbone  
SwitchModule to automatically make the redundant ATM OC-3 card  
active if the primary ATM OC-3 card fails (or performance degrades  
significantly):  
CB5000> set module <slot>.1 phy_automatic_failover enable  
 
       
If you disable automatic failover and a primary ATM OC-3 card failure  
occurs, you must use the command in step 1 to make the redundant  
ATM OC-3 card active.  
There is a configurable feature called the loss of signalling delay. The  
default is 0 seconds, and the maximum is 60 seconds. PHY failover can  
take from 0 through 60 seconds when the automatic failover feature is  
enabled. The command is:  
CB5000> set atm <slot>.1 loss_of_signalling_delay <seconds>  
Configuring IGMP  
Snooping  
Parameters  
IGMP snooping must be enabled on both the ATM backbone  
SwitchModule and the vbridge on which you plan to use IGMP  
snooping.  
To enable IGMP snooping on the ATM Backbone SwitchModule:  
Before you can enable IGMP snooping, you must set up an IP address  
for each vbridge that is configured on the ATM Backbone  
SwitchModule. You must setup a subnet mask before you can assign  
an IP address. The correct commands are:  
SET IP SUBNET_MASK <FF.FF.FF>.00 VBRIDGE 1  
SET IP IP_ADDRESS <XXX.XXX.XX>.00 VBRIDGE 1  
SAVE ALL (This saves the address parameters for vbridge 1.)  
SHOW IP (This displays the IP address you just created for vbridge 1.)  
1 Enable IGMP snooping on the ATM Backbone SwitchModule.  
For example, the following command enables IGMP snooping on an  
ATM Backbone SwitchModule in slot 9:  
CB5000> set module 9.1 igmp_snooping enable  
2 Enable IGMP snooping on a vbridge configured on the ATM Backbone  
SwitchModule.  
For example, the following command enables IGMP snooping on  
vbridge 1 on the ATM Backbone SwitchModule in slot 9:  
CB5000> set vbridge 1 igmp_snooping mode enable  
 
 
Configuring IGMP Snooping Parameters 3-11  
3 View the status of IGMP snooping on a vbridge configured on the ATM  
backbone SwitchModule.  
For example, the following command displays the status of IGMP  
snooping on vbridge 1 on the ATM Backbone SwitchModule in slot 9:  
CB5000> show vbridge 1 igmp_snooping status  
4 Save the parameter changes you made.  
For example, the following command saves the parameter changes you  
made to the ATM Backbone SwitchModule in slot 9:  
CB5000> save all  
This command only saves the parameter changes in RAM. To actually  
effect the changes on the ATM Backbone SwitchModule, you must  
reset the module.  
5 Reset the ATM Backbone SwitchModule to enable IGMP snooping on  
the SwitchModule and the vbridge.  
For example, the following command resets the ATM Backbone  
SwitchModule in slot 9, thus enabling IGMP snooping on the  
SwitchModule and vbridge 1:  
CB5000> reset module 9.1  
CAUTION: Do not use the RESET HUB command in this instance.  
Parameters saved in NVRam may not get updated if you use the RESET  
HUB command. Use only the RESET MODULE command in this  
instance.  
 
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STATUS MONITORING AND  
STATISTICS  
4
This chapter describes the tools that you can use to monitor module  
status and gather statistics that help you to analyze the  
CoreBuilder 5000 ATM Backbone SwitchModule and network  
performance.  
This chapter contains the following sections:  
Using DMM/ADMM Commands  
Using Graphical Interface Tools  
Using DMM/ADMM  
Commands  
You can use the following DMM/ADMM commands to display  
configuration and status information about the ATM Backbone  
SHOW ATM  
SHOW BPORT_LEC  
SHOW SONET  
SHOW IGMP SNOOPING  
See the CoreBuilder 5000 ATM Backbone SwitchModule Command  
Reference for a complete list of available DMM/ADMM commands and  
a full list of parameters for each command.  
 
     
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TATUS ONITORING AND TATISTICS  
SHOW VBRIDGE Use the SHOW VBRIDGE command to display the following vbridge  
configuration information about the ATM Backbone SwitchModule:  
General vbridge configuration information  
Detailed vbridge configuration information  
IGMP snooping information on a vbridge  
Displaying General Vbridge Configuration Information  
The following command shows general vbridge configuration  
information about an ATM Backbone SwitchModule in a  
CoreBuilder 5000 hub:  
You do not have to enter no_verbose to see the general information.  
CB5000> show vbridge all configuration no_verbose  
VBridge  
Bridge Identifier  
Ports  
Spanning Tree General Information  
-------- ----------------------- ------- ------------- -------------------  
1
2
11  
80-00-08-00-8f-20-e5-f8  
80-00-08-00-8f-11-c5-fa  
80-00-08-00-8f-11-2e-1b  
41  
2
3
ENABLED  
ENABLED  
ENABLED  
vbridge_1  
vbridge_2 (root)  
vbridge_11 (root)  
 
   
Using DMM/ADMM Commands  
4-3  
Displaying Detailed Vbridge Configuration Information  
The following command shows detailed vbridge configuration  
information about an ATM Backbone SwitchModule in a  
CoreBuilder 5000 hub:  
CB5000>show vbridge all configuration verbose  
Interface Number:  
4
Interface Mode:  
Aging Time:  
ENABLED  
300  
Learned Entry Discards:  
Spanning Tree Priority:  
Spanning Tree Bridge Max Age:  
0
32768  
20.00  
Spanning Tree Bridge Forward Delay: 15.00  
Spanning Tree Bridge Hello Time:  
Spanning Tree Hold Time:  
Spanning Tree Max Age:  
Spanning Tree Hello Time:  
Spanning Tree Forward Delay:  
Designated Root:  
2.00  
1.00  
20.00  
2.00  
15.00  
80-00-00-02-9c-06-3b-40  
Root Cost:  
102  
Root Port:  
289  
Topology Changes:  
302  
Time Since Topology Changed:  
IGMP Snooping Mode:  
1358.83  
ENABLED  
 
 
4-4  
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TATUS ONITORING AND TATISTICS  
Displaying IGMP Snooping Vbridge Information  
The following command shows IGMP snooping status information for  
vbridge 11 configured on an ATM Backbone SwitchModule installed in  
the hub:  
CB5000> show vbridge 11 igmp_snooping status  
IGMP Snooping Status of VBridge 11  
------------------------------------------------------------  
IGMP Snooping  
IGMP Querying  
ENABLED  
ENABLED  
300  
0.0.0.0  
DISABLED  
120  
Port Aging Time (seconds)  
Querier IP Address  
Querier State  
Querier Listen Time (seconds)  
Querier Interval  
60  
Sent Query Packets  
Group Aging Time (seconds)  
0
300  
Table 4-1 lists the other options you can use with the SHOW VBRIDGE  
<VBRIDGE_NUMBER> IGMP_SNOOPING command and the information  
that appears:  
Other Vbridge IGMP Snooping Options  
Table 4-1  
Option  
Information Shown  
bridge_port  
IGMP snooping bridge port information for the vbridge  
<number>  
mac  
IGMP snooping mac address information for the  
vbridge <number>  
ip  
IGMP snooping IP address information for the vbridge  
<number>  
router_ports  
IGMP snooping router ports information for the vbridge  
<number>  
 
 
Using DMM/ADMM Commands  
4-5  
SHOW MODULE Use the SHOW MODULE command to display module-level information  
about the ATM Backbone SwitchModule.  
The following command shows detailed module information about an  
ATM Backbone SwitchModule in slot 4 of a CoreBuilder 5000 hub:  
CB5000> show module 4.1 verbose  
Slot  
------ ------------ ------- --------- -------------------  
04.01 6602M-MOD 3.0 N/A  
Module  
Version Network  
General Information  
6602M-MOD: ATM Backbone SwitchModule  
Boot Version:  
v2.05  
RMON Analyzer:  
NONE  
CPU RAM Size (Mb):  
FLASH Memory (Mb):  
Packet Memory (Mb):  
Shared Memory (Mb):  
Descriptor Memory (Mb):  
SAR Control Memory (Kb):  
Address Cache Entries:  
PHY Configuration Select:  
PHY Current Select:  
PHY Automatic Failover:  
IGMP Snooping:  
8
4
16  
2
1
64  
1024  
2
2
ENABLED  
ENABLED  
 
 
4-6  
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TATUS ONITORING AND TATISTICS  
SHOW BRIDGE_PORT Use the SHOW BRIDGE_PORT command to display:  
General status information for all bridge ports on the module  
Detailed information about one bridge port on the module  
Displaying General Status Information  
The following command displays information about all defined bridge ports  
(LECs) on an ATM Backbone SwitchModule in slot 4 of a CoreBuilder 5000  
hub:  
CB5000> show bridge_port 4.all  
Bridge Port Display for Module 6602M-MOD:  
BPort I/F Status Stp State  
----- ---------- ---------  
Vbridge Logical General Info  
-------- ------- ------------  
04.01 ENABLED  
04.02 ENABLED  
04.03 DISABLED  
04.04 DISABLED  
04.05 DISABLED  
04.06 DISABLED  
FORWARDING  
BLOCKED  
DISABLED  
DISABLED  
DISABLED  
DISABLED  
11  
1
UNASSGN  
UNASSGN  
UNASSGN  
UNASSGN  
73  
73  
73  
73  
73  
73  
 
   
Using DMM/ADMM Commands  
4-7  
Displaying Detailed Information  
The following command displays information about bridge port 2 on an  
ATM Backbone SwitchModule in slot 4 of a CoreBuilder 5000 hub:  
CB5000> show bridge_port 4.2 verbose  
Bridge Port Display for Module 6602M-MOD:  
BPort I/F Status Stp State  
----- ---------- ---------  
Vbridge Logical General Info  
-------- ------- ------------  
04.02 ENABLED  
BLOCKED  
1
73  
MAC Address:  
Port Name:  
08-00-8f-40-a5-41  
Bridge Port STP Mode:  
Interface Mode:  
Spanning Tree Priority:  
Spanning Tree Path Cost:  
NORMAL  
ENABLED  
128  
6
Spanning Tree Forward Transitions:0  
Designated Root:  
Designated Cost:  
80-00-00-02-9c-06-3b-40  
102  
Designated Bridge:  
Designated Port:  
80-00-08-00-8f-13-e0-d3  
80-79  
RMON Monitor Supported:  
NOT_SUPPORTED  
RMON Monitor Source:  
DISABLED  
 
 
4-8  
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TATUS ONITORING AND TATISTICS  
SHOW COUNTER Use the SHOW COUNTER BRIDGE_PORT command to display statistics  
BRIDGE_PORT for a bridge port on the module.  
The following command displays statistics about bridge port 2 on an  
ATM Backbone SwitchModule in slot 4 of a CoreBuilder 5000 hub:  
CB5000> show counter bridge_port 4.2 interface  
Interface Statistics for Module 6602M-MOD Bridge Port 4.2  
-------------------------------------------------------------  
Bridge Received Frames  
Bridge Received Discards  
Bridge Transmitted Frames  
551932  
0
1
Bridge Delay Exceeded Discards 0  
Received Octets  
403424960  
Received Unicast Packets  
Received Non-Unicast Packets  
Received Discards  
551942  
551932  
23  
0
Received Errors  
Received Unknown Protocols  
Transmitted Octets  
Transmitted Unicast Packets  
0
498  
4
Transmitted Non-Unicast Packets1  
Transmitted Errors  
% Non-Unicast Packets  
% Utilization  
0
50.0%  
0.0%  
0.0%  
% Error Frames  
The following command displays IGMP snooping statistics about bridge  
port 2 on an ATM Backbone SwitchModule in slot 4 of a  
CoreBuilder 5000 hub:  
CB5000> show count bridge_port 4.2 igmp_snooping  
IGMP Snooping Statistics for Module 6602M-MOD Bridge Port 4.2  
------------------------------------------------------------  
Transmitted Report Packets  
Transmitted Query Packets  
Transmitted Join Packets  
Transmitted Leave Packets  
0
0
0
0
Received Report Packets  
Received Query Packets  
Received Join Packets  
Received Leave Packets  
0
0
0
0
 
 
Using DMM/ADMM Commands  
4-9  
SHOW ATM Use the SHOW ATM command to display the following ATM  
information:  
ATM ILMI Configuration  
ATM QSAAL Parameters  
ATM Signal Configuration  
ATM Statistics  
ATM Traffic Description  
ATM VCCs  
ATM Interface The following command displays information about ATM interface  
Parameters parameters for an ATM Backbone SwitchModule in slot 4 of a  
CoreBuilder 5000 hub:  
CB5000> show atm 4 interface  
Slot  
Module  
Version Network  
General Information  
------ ------------ ------- --------- -------------------  
04  
6602M-MOD  
3.0  
N/A  
Current  
Next Reset  
----------  
--------------  
Max VCCs:  
512  
0/9  
8
512  
0/9  
8
3.0  
-
Active VPI/VCI Bits:  
Number of LECs:  
UNI Version:  
3.0  
LEARP Quiet Time (secs) 5  
Loss of Signal Delay:  
Neighbor IP Address:  
0
0
192.83.237.19  
Neighbor Interface Name: <none>  
 
   
4-10  
C
4: S  
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TATUS ONITORING AND TATISTICS  
ATM ILMI The following command displays information about the ATM ILMI  
Configuration configuration for an ATM Backbone SwitchModule in slot 4 of a  
CoreBuilder 5000 hub:  
CB5000> show atm 4 ilmi_configuration  
Slot  
------ ------------ ------- --------- -------------------  
04 6602M-MOD 3.0 N/A  
Module  
Version Network  
General Information  
Current  
Next Reset  
---------- -------------  
ILMI PVC:  
0/16  
0/16  
LMI Peak Cell Rate (%line rate): 5  
LMI Sust Cell Rate (%line rate): 1  
5
1
ILMI Burst Size (cells):  
ILMI Request Timeout (secs):  
ILMI Request Retries:  
11  
5
2
11  
5
2
ILMI Admin Vbridge:  
1
ATM Q93b The following command displays information about ATM Q93b  
Parameters parameters for an ATM Backbone SwitchModule in slot 4 of a  
CoreBuilder 5000 hub:  
CB5000> show atm 4 q93b  
Slot  
------ ------------ ------- --------- -------------------  
04 6602M-MOD 3.0 N/A  
Module  
Version Network  
General Information  
Current  
Next Reset  
---------- -------------  
T303 (secs):  
T308 (secs):  
T309 (secs):  
T310 (secs):  
T313 (secs):  
T316 (secs):  
T317 (secs):  
T322 (secs):  
4
4
30  
90  
10  
4
120  
60  
4
30  
90  
10  
4
120  
60  
4
 
   
Using DMM/ADMM Commands 4-11  
ATM QSAAL The following command displays information about ATM QSAAL  
Parameters parameters for an ATM Backbone SwitchModule in slot 4 of a  
CoreBuilder 5000 hub:  
CB5000> show atm 4 qsaal  
Slot  
------ ------------ ------- --------- -------------------  
04 6602M-MOD 3.0 N/A  
Module  
Version Network  
General Information  
Current  
Next Reset  
---------- -------------  
Poll Timer (msecs):  
100  
1
300  
15  
2
100  
1
300  
15  
2
Keepalive Timer (secs):  
No Response Timer (secs):  
Idle Timer (secs):  
CC Timer (secs):  
Max CC Retries:  
4
4
Max PD Retries:  
Stat Max Ranges:  
25  
67  
25  
67  
ATM Signal The following command displays information about the ATM signal  
Configuration configuration for an ATM Backbone SwitchModule in slot 4 of a  
CoreBuilder 5000 hub:  
CB5000> show atm 4 signal_configuration  
Slot  
------ ------------ ------- --------- -------------------  
04 6602M-MOD 3.0 N/A  
Module  
Version Network  
General Information  
Current  
Next Reset  
---------- -------------  
Sig PVC:  
0/5  
-
Sig Peak Cell Rate (% line rate):5  
Sig Sust Cell Rate (% line rate):1  
5
1
Sig Max Burst Size (cells):  
11  
11  
 
   
4-12  
C
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TATUS ONITORING AND TATISTICS  
ATM Statistics The following command displays ATM statistics for an ATM Backbone  
SwitchModule in slot 4 of a CoreBuilder 5000 hub:  
CB5000> show atm 4 statistics  
Slot  
------ ------------ ------- --------- -------------------  
04 6602M-MOD 3.0 N/A  
Module  
Version Network  
General Information  
ATM  
AAL5  
---------- ----------  
996327390 709247719  
18798630 8030817  
In Octets:  
In Frames:  
In Errors:  
In Discards:  
In Unknown Protocols:  
Out Octets:  
0
0
0
0
0
0
456665649 278670149  
Out Frames:  
8616333  
4607911  
Out Errors:  
Out Discards:  
0
0
0
0
ATM Traffic The following command displays descriptive statistics for ATM traffic on  
Description an ATM Backbone SwitchModule in slot 4 of a CoreBuilder 5000 hub:  
CB5000> show atm 4 traffic_descriptor all  
Slot  
------ ------------ ------- --------- -------------------  
04 6602M-MOD 3.0 N/A  
Module  
Version Network  
General Information  
Index Descr Type  
PeakCellRateSustCellRate MaxBurstSize  
----- ----- ---------------------- --------------------------  
1
2
3
4
5
6
7
8
9
ILMI NoClpScr 17661  
SIG NoClpScr 17661  
155M NoClpNoScr 353208  
100M NoClpNoScr 260417  
50M NoClpNoScr 130208  
25M NoClpNoScr 60377  
3533  
3533  
11  
11  
0
0
0
0
0
0
0
0
0
0
0
0
0
0
8M  
6M  
2M  
NoClpNoScr 18120  
NoClpNoScr 13590  
NoClpNoScr 4530  
 
   
Using DMM/ADMM Commands 4-13  
ATM VCCs The following command displays information about ATM VCCs for an  
ATM Backbone SwitchModule in slot 4 of a CoreBuilder 5000 hub:  
CB5000> show atm 4 vcc all  
Slot  
------  
04  
Module  
---------- ------- ---------  
6602M-MOD 3.0 N/A  
Version Network  
General Information  
-------------------  
VCC  
Status TxDescr RxDescr Type TxSDU RxSDU Encap  
------------- ------- ------- ------ ------ --------------------  
0/5  
UP  
SIG  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
N/A  
AAL5 500  
AAL5 500  
500  
500  
OTHER  
OTHER  
0/16 UP  
0/105 UP  
0/106 UP  
0/107 UP  
0/108 UP  
0/109 UP  
0/110 UP  
0/111 UP  
0/112 UP  
0/113 UP  
ILMI  
155M  
155M  
155M  
155M  
155M  
155M  
155M  
155M  
155M  
AAL5 1516 1516 LANE 8023  
AAL5 1516 1516 LANE 8023  
AAL5 1516 1516 LANE 8023  
AAL5 1516 1516 LANE 8023  
AAL5 1516 1516 LANE 8023  
AAL5 1516 1516 LANE 8023  
AAL5 1516 1516 LANE 8023  
AAL5 1516 1516 LANE 8023  
AAL5 1516 1516 LANE 8023  
SHOW BPORT_LEC Use the SHOW BPORT_LEC command to display the following  
BPORT_LEC Statistics  
BPORT_LEC Status  
BPORT_LEC Server Circuits  
BPORT_LEC LE_ARP Table  
 
   
4-14  
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TATUS ONITORING AND TATISTICS  
BPORT_LEC The following command displays configuration information for  
Configuration bridgeport-LEC 2 on an ATM Backbone SwitchModule in slot 4 of a  
CoreBuilder 5000 hub:  
CB5000> show bport_lec 4.2 configuration  
Bridge Port LEC Display for Module 6602M-MOD:  
BP LEC  
--------- ------------ ------------- -------------------  
04.02 ENABLED ENABLED  
Mode  
I/F Status  
General Info  
Configuration Mode:  
ELAN Name:  
MANUAL  
cpsw_2  
ELAN Type:  
Maximum Data Frame Size:  
LES ATM Address:  
UNSPECIFIED  
UNSPECIFIED  
39.99.99.99.99.99.99.00.00.99.99.02.02.99.99.99.99.99.99.03  
LECS ATM Address:  
Aging Time (secs):  
<none>  
300  
BUS Rate Limit (packets/secs):  
Connection Complete Timer (secs):  
Control Timeout (secs):  
5000  
4
120  
Expected ARP Response Time (secs): 1  
Flush Timeout (secs):  
4
Forward Delay Time (secs):  
Maximum Retry Count:  
15  
1
Maximum Unknown Frame Count:  
1
Maximum Unknown Frame Time (secs): 1  
Number of ELAN VCCs:  
512  
Path Switching Delay (secs):  
VCC Timeout Period (secs):  
6
1200  
 
 
Using DMM/ADMM Commands 4-15  
BPORT_LEC Statistics The following command displays statistics for bridgeport-LEC 2 on an  
ATM Backbone SwitchModule in slot 4 of a CoreBuilder 5000 hub:  
CB5000> show bport_lec 4.2 statistics  
Bridge Port LEC Display for Module 6602M-MOD:  
BP LEC  
Mode  
I/F Status  
General Info  
--------- ------------ ------------- -------------------  
04.02  
ENABLED  
ENABLED  
LEARP Request Out:  
LEARP Request In:  
LEARP Replies Out:  
LEARP Replies In:  
Control Frames Out:  
Control Frames In:  
SVC Failures:  
1
1
0
1
4
580907  
0
BPORT_LEC Status The following command displays status information for  
bridgeport-LEC 2 on an ATM Backbone SwitchModule in slot 4:  
CB5000> show bport_lec 4.2 status  
BP LEC  
--------- ------------ ------------- -------------------  
04.02 ENABLED ENABLED  
Mode  
I/F Status  
General Info  
Actual ELAN Name:  
Actual ELAN Type:  
cpsw_2  
AFLANE 8023  
Actual Maximum Data Frame Size: 1516  
LECS ATM Address:  
LECS Address Source:  
Actual LES ATM Address:  
<none>  
DID NOT USE LECS  
39.99.99.99.99.99.99.00.00.99.99.02.02.99.99.99.99.99.99.03  
LEC ID:  
17  
Link Trap:  
DISABLED  
Interface State:  
Last Failure Response Code:  
Last Failure State:  
LANE Protocol:  
LANE Version:  
OPERATIONAL  
INSUFF RESOURCES  
BUS CONNECT  
1
1
Topology Change:  
Proxy Client:  
OFF  
YES  
LEC ATM Address:  
39.99.99.99.99.99.99.00.00.99.99.02.02.08.00.8f.40.a5.41.02  
 
   
4-16  
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TATUS ONITORING AND TATISTICS  
BPORT_LEC Server The following command displays the server circuits for bridgeport-LEC 2  
Circuits on an ATM Backbone SwitchModule in slot 4:  
CB5000> show bport_lec 4.2 server_circuits  
Bridge Port LEC Display for Module 6602M-MOD:  
BP LEC  
--------- ------------ ------------- -------------------  
04.02 ENABLED ENABLED  
Mode  
I/F Status  
General Info  
Configuration Direct VPI/VCI: 0/0  
Control Direct VPI/VCI:  
Control Distribute VPI/VCI:  
Multicast Send VPI/VCI:  
Multicast Forward VPI/VCI:  
0/105  
0/106  
0/107  
0/108  
BPORT_LEC The following command displays information for an ATM Backbone  
LE_ARP Table SwitchModule in slot 4:  
CB5000> show bport_lec 4.2 learp_table all  
Bridge Port LEC Display for Module 6602M-MOD:  
BP LEC  
Mode  
I/F Status  
General Info  
--------- ------------ ------------- -------------------  
04.02  
ENABLED  
ENABLED  
MAC Address  
-----------  
ATM Address  
------------------------  
08-01-20-05-05-e3 39.99.99.99.99.99.99.00.00.99.99.05.07.08.00.8f.40.a4.c0.02  
 
   
Using DMM/ADMM Commands 4-17  
SHOW SONET Use the SHOW SONET command to display the following ATM SONET  
information:  
SHOW SONET Status  
SHOW SONET Statistics  
SHOW SONET Status The following displays SONET status information for an ATM Backbone  
SwitchModule in slot 13:  
CB5000> show sonet 13.1 status  
Slot  
------ ------------ ------- --------- -------------------  
04 6602M-MOD 3.0 N/A  
Module  
Version Network  
General Information  
Medium Type:  
SONET  
665  
13  
Medium Time Elapsed (sec):  
Medium Valid Intervals:  
Medium Line Coding:  
NRZ  
Medium Line Type:  
Medium Clock Source:  
MULTI-MODE  
EXTERNAL  
Section Current Status:  
Line Current Status:  
Path Current Status:  
Path Current Width:  
OKAY  
OKAY  
OKAY  
STS3C  
M/S/L Speed (Mbps):  
M/S/L Admin Status:  
M/S/L Oper Status:  
M/S/L Last Change:  
155520000  
ENABLED  
UP  
0
Path Speed (Mbps):  
Path Admin Status:  
Path Oper Status:  
Path Last Change:  
155520000  
ENABLED  
UP  
0
 
   
4-18  
C
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TATUS ONITORING AND TATISTICS  
SHOW SONET The following command displays SONET statistics for an ATM Backbone  
Statistics SwitchModule in slot 7:  
CB5000> show sonet 7.1 statistics interval all  
Slot  
Module  
Version Network  
General Information  
------ ------------ ------- --------- -------------------  
04  
6602M-MOD  
3.0  
N/A  
SECTION  
LINE  
PATH  
----------------------------------------------------------------  
Int hh:mm ES SES SFS CV ES SES UAS CV ES SES UAS  
----------------------------------------------------------------  
1 -00:15  
2 -00:30  
3 -00:45  
4 -01:00  
5 -01:15  
6 -01:30  
7 -01:45  
8 -02:00  
9 -02:15  
10 -02:30  
11 -02:45  
12 -03:00  
13 -03:15  
14 -03:30  
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0
0
0
0
0
0
0
0
0
0
0
0
0
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0 0 0  
0
0
0
0
0
0
0
0
0
0
0
0
0
0
10 0  
0
0
11 0 0 0  
0
0
0
0
0 0 0  
0 0 0  
11 0  
38 88 11 0  
21 54 0 0  
 
 
Using DMM/ADMM Commands 4-19  
SHOW IGMP Use the SHOW IGMP SNOOPING command to display the IGMP  
SNOOPING snooping information on a module. You can view the IGMP snooping  
information on all of the modules installed in a CoreBuilder 5000 hub  
using the SHOW IGMP_SNOOPING MODULE ALL command or IGMP  
snooping information on a specific module using the SHOW  
IGMP_SNOOPING MODULE <SLOT.SUBSLOT> command.  
The following command shows IGMP snooping information about the  
ATM Backbone SwitchModule installed in slot 4 of a CoreBuilder 5000  
hub:  
CB5000> show igmp_snooping module 4.1  
IGMP Snooping Information  
------------------------------------------------------------  
IGMP Snooping is currently ENABLED.  
IGMP Snooping after Module Reboot is ENABLED.  
Entry  
VBridge  
IGMP Mode  
------------------------------------------------------------  
1
2
1
11  
ENABLED  
ENABLED  
 
 
4-20  
C
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TATUS ONITORING AND TATISTICS  
®
Using Graphical  
Interface Tools  
Transcend Network Control Services provides advanced graphical  
management capabilities that enable you to monitor ATM Backbone  
SwitchModule operation and collect and display statistics. Transcend  
Network Control Services graphical management tools include:  
CoreBuilder 5000 Manager  
Device Management for Hubs  
VLAN Manager  
LANE Manager  
You can also use a third-party network management application for  
SNMP-based monitoring and analysis.  
CoreBuilder 5000 3Com CoreBuilder 5000 Manager uses the Simple Network  
Manager Management Protocol (SNMP) to poll devices for status, configuration,  
and traffic information.  
CoreBuilder 5000 Manager monitoring and display functions include:  
Display of hub status  
Display of module and port configuration and status  
Display and logging of traffic statistics  
Display and logging of alarm conditions and messages (traps)  
The ATM Backbone SwitchModule supports the following MIBs:  
MIB II – RFC 1213  
Bridge MIB – RFC 1493  
Interfaces MIB – RFC 1573  
ATM MIB – RFC 1695  
SONET MIB – RFC 1595  
ATM Forum LEC MIB  
IANAIFTYPE MIB  
3Com ISD MIB  
For specific information on displaying information and statistics using  
CoreBuilder 5000 Manager, refer to the CoreBuilder 5000 Manager  
documentation for the platform you are running (UNIX or Windows).  
 
   
Using Graphical Interface Tools 4-21  
Device Management Device Management for Hubs allows you to display the operating  
for Hubs status of a selected device, configure the device, or display statistics.  
When you launch Device Management for Hubs, an image of the  
selected device, known as Device View, appears. The Device View  
depicts the current configuration of the device. For example, ports  
displayed on the Device View are color-coded to indicate the current  
state of the port. By selecting various areas of the Device View and  
using menus, you can monitor and manage the objects represented by  
the selected area of the Device View.  
VLAN Manager VLAN Manager displays all local VLANs and ATM-based ELANs. You can  
move segments between VLANs and view a graphical description of the  
path between two segments within a VLAN.  
LANE Manager LANE Manager discovers all 3Com-based LECS, LES, and LEC  
components in the network and shows you their interconnections.  
 
     
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TATUS ONITORING AND TATISTICS  
 
INTERNET GROUP MANAGEMENT  
PROTOCOL (IGMP) SNOOPING  
5
This chapter provides the following information about IGMP snooping:  
Overview  
CoreBuilder 5000 Support  
Locating Multicast Routers in the Network  
No Multicast Routers on the Network  
Enabling IGMP Snooping on CoreBuilder 5000 SwitchModules  
Overview  
The Internet Group Management Protocol (IGMP) runs between hosts  
and their immediate neighboring multicast routers. This protocol is not  
a client/server protocol, but rather a routing protocol.  
Through IGMP, a host to inform its local router that it wants to receive  
transmissions that are addressed to a specific multicast group. Also,  
routers periodically query the LAN to determine if known group members  
are still active.  
Based on the group membership information learned from the IGMP, a  
router can determine which (if any) multicast traffic needs to be  
forwarded to each of its subnetworks. Multicast routers use this  
information in conjunction with a multicast routing protocol to support IP  
multicasting across the Internet. Layer 2 switches flood multicast packets  
to all ports without the presence of management specified filters.  
 
       
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NTERNET ROUP ANAGEMENT ROTOCOL NOOPING  
(IGMP) S  
Disabling IGMP  
snooping  
The default setting for IGMP snooping is enabled. To disable it, enter  
the SET VBRIDGE <X> IGMP_SNOOPING DISABLE command.  
Before  
implementing IGMP  
snooping  
Before you implement IGMP snooping within your network, be aware  
of how the CoreBuilder 5000 SwitchModule and your software  
®
vendors multicast applications function with respect to IGMP.  
Inherently, all IGMP-compliant viewer applications on your network  
issue IGMP Membership Report packets (in response to IGMP Query  
Packets sent out from a local IGMP-compliant switch or router)  
requesting either to start or to continue sending the multicast stream to  
that port. However, some multicast applications do not send IGMP  
reports onto the network from the broadcasting server.  
Depending on how your network is configured, broadcasters that do  
not send report packets onto the network can potentially cause  
excessive flooding for that vbridge or subnet. The CoreBuilder 5000  
filters multicast traffic on a per-stream basis after receiving an IGMP  
report packet on the local vbridge or subnet. If IGMP report packets are  
never seen for a particular multicast session, that stream continues to  
flood within that vbridge or subnet. This situation may appear as if  
IGMP snooping is not functioning properly, when actually it is the  
limitation of the broadcasting application that fails to send IGMP Report  
packets to the querying switch or router on that subnet.  
Placement of IGMP  
servers  
Placement of IGMP multicast servers that do not issue IGMP Report  
packets is critical to the proper functioning of IGMP snooping on the  
CoreBuilder 5000 product. If your IGMP Broadcasting application does  
not issue IGMP report packets, 3Com recommends that you either  
place at least one multicast client within the same subnet or vbridge as  
the IGMP multicast server or run the viewer software at the same time  
on the broadcasting server.  
 
Overview 5-3  
Figure 5-1 shows a typical packet path before snooping occurs.  
Multicast  
Router  
Host 3  
Host 1  
CoreBuilder® 5000 Hub  
Host 3 sends a  
Multicast Packet  
Host 2  
Multicast Packet Path before Snooping  
Figure 5-1  
Eliminating  
unwanted IP  
multicast protocols  
IGMP snooping switch and multicast MAC address filters work together  
to eliminate unwanted IP multicast routing protocols as follows:  
The IGMP snooping switch filters IP multicast packets based on  
IGMP/IP and IP multicast packets to only the subset of ports that are in  
a multicast group.  
The multicast MAC address filters restrict multicast packets to only the  
subset of ports that request this traffic, thus freeing up bandwidth for  
useful traffic.  
 
 
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NTERNET ROUP ANAGEMENT ROTOCOL NOOPING  
(IGMP) S  
Figure 5-2 shows the format of a typical IGMP snooping version 1  
message that is received after an IGMP snooping query in a multicast  
group has been completed.  
0
3
4
7 8  
15 16  
31  
4-bit  
4-bit  
IGMP  
Type  
8-bit  
Unused  
IGMP  
16-bit checksum  
Version  
32-bit group address (Class D IP Address)  
Format of an IGMP Version 1 Message  
Figure 5-2  
®
When IGMP snooping is running on a CoreBuilder 5000 hub, it allows  
multicast traffic to ports where:  
IGMP Report packets for that multicast group have been observed.  
Multicast routing protocols have been observed.  
Figure 5-3 shows a typical multicast packet path after snooping has  
occurred.  
Multicast  
Router  
Host 3  
Host 1  
CoreBuilder® 5000 Hub  
Host 3 sends a  
Multicast Packet  
Host 2  
Multicast Packet Path after Snooping  
Figure 5-3  
 
   
Overview 5-5  
The result is that multicast traffic is flooded through a multicast  
group-specific subset of the switched fabric, namely that subset that  
contains either end stations that have joined the given multicast group,  
or multicast routers.  
The location of multicast group members is determined by snooping on  
the IGMP/IP report packets sent from the hosts. This information is  
aged out and refreshed by hearing new reports. the location of the  
multicast routers can either be configured by management or be  
determined by snooping on protocols such as:  
Protocol-Independent Multicast (PIM)  
Multicast Open Shortest Path First (MOSPF)  
Distance Vector Multicast Routing Protocol (DVMRP)  
The CoreBuilder 5000 hub uses the following two types of IGMP  
packets to determine the flow of multicast data:  
Queries — Query packets (IGMP Type = 1) are flooded to all ports  
in the vbridge.  
Reports — Report packets (IGMP Type = 2 and 6) are only sent to  
multicast router ports. They are not forwarded to other ports  
because they inhibit hosts on those ports from reporting their own  
membership in those groups. This results in overly restrictive filtering  
by the hub.  
IGMP is a host-to-router protocol that assumes there is shared medium  
between both types of IGMP packets. Because of this assumption,  
when a host hears a report for a host group IP that wants to join, that  
host assumes that it does not need to send a report to receive this host  
group traffic. This occurs when the IGMP protocol is optimized to  
minimize the number of reports sent. This is not true for filtering  
switches that interconnect the multicast routers to hosts, however.  
 
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NTERNET ROUP ANAGEMENT ROTOCOL NOOPING  
(IGMP) S  
CoreBuilder 5000  
Support  
The CoreBuilder 5000 supports 46 IP multicasting groups by IP relay. If  
no multicast router is detected, the CoreBuilder 5000 hub acts as an  
IGMP querier to allow the network to determine hosts that are  
members of a group.  
The CoreBuilder 5000 allows the user to create ports in the vbridge  
that are classified as router ports. This ensures that multicast data is  
always flowing over the link.  
Locating Multicast  
Routers in the  
Network  
Multicast packets are received by all multicast routers on the LAN  
because the switches always flood all multicast packets. Routing  
protocol packets and data packets are flooded toward all ports on  
which routing protocols have been received. To decrease the flooding  
of multicast packets through a hub multicast router, the ports must be  
identified.  
The location of the multicast routers can either be configured by  
management or determined by snooping on protocols such as PIM,  
MOSPF, and DVMRP. After the router ports are determined, filters are set  
up within the CoreBuilder 5000 hub to identify these ports and the  
specific multicast packets flowing to each port.  
No Multicast  
Routers on the  
Network  
To receive the IGMP reports, networks that do not have multicast  
capable routers need to have a designated querying device. The  
CoreBuilder 5000 hub can be the designated querier in a network  
without any multicast routers.  
The designated querier is the IGMP query-capable device with the lowest  
IP address in a flooding domain. If a multicast router is found on the  
network, the CoreBuilder 5000 SwitchModule does not send IGMP  
queries, even if it has the lowest IP address. However, in a switched fabric  
that does not have any multicast routers, the CoreBuilder 5000 hub elects  
a designated querier in the absence of query packets.  
You must assign an IP address to a vbridge via the DMM console to  
designate the CoreBuilder 5000 SwitchModule as a querying device.  
 
     
Enabling IGMP Snooping on CoreBuilder 5000 SwitchModules 5-7  
Enabling IGMP  
Snooping on  
IGMP snooping can be enabled on the following CoreBuilder 5000  
SwitchModules:  
CoreBuilder 5000  
SwitchModules  
FTE SwitchModule v1.2  
GigaFTE SwitchModules  
IGMP snooping on  
a CoreBuilder 5000  
SwitchModule  
When you enable IGMP snooping on either an FTE SwitchModule, v1.2,  
or a GigaFTE SwitchModule, the IP multicast bit is enabled in the  
modules Receive Control Register. This causes the modules receive  
state machine to parse all IP packets looking for the IGMP protocol. If  
the packet is an IGMP packet, it is directed to the management  
processor queue for snooping purposes.  
The management processor then learns the multicast address and adds  
it to the modules forwarding tables. When the IP multicast bit in the  
modules Receive Lookup Control Register is enabled, the forwarding  
table entries have a 36-bit destination port map. When a packet enters  
the module, the processor looks up the address and directs the packet  
to the allowed destination port map. Figure 5-4 shows a typical FTE  
DRAM address forwarding entry.  
The only difference between the modules when IGMP snooping is  
enabled is that the IP Multicast Bit is Bit <20> in the FTE, v1.2 module  
and Bit<13> in the GigaFTE module.  
 
 
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(IGMP) S  
Figure 5-4 shows a typical FTE DRAM address forwarding entry.  
Dest  
Slot  
Lock  
Down  
LrnPort  
SrcAge  
HashRem RateLimit  
Mgmt  
Vlan ID  
Copy  
Unused  
FTE Address Forwarding Entry When IGMP Multicast Bit is Disabled  
Dest  
Slot  
Lock  
Down  
LrnPort  
SrcAge  
HashRem RateLimit  
Mgmt  
Vlan ID  
Copy  
Unused  
Unused  
Allowed Port Map  
FTE Address Forwarding Entry When IGMP Multicast Bit is Enabled  
FTE DRAM Address Forwarding Entry  
Figure 5-4  
Frame Tagging can be set on a CoreBuilder 5000 SwitchModule after it  
is enabled for IGMP snooping.  
 
 
TROUBLESHOOTING  
6
This chapter describes:  
Troubleshooting Using LEDs  
Recovering from Problems  
Resetting the ATM Backbone SwitchModule  
Troubleshooting  
Using LEDs  
This section identifies possible causes and solutions for ATM Backbone  
SwitchModule LED indications. This section describes:  
Troubleshooting ATM OC-3 Card LEDs  
Troubleshooting Base This section explains the procedures for:  
Module LEDs  
Verifying Base Module LED Operation  
Reading the Base Module LEDs  
Refer to Determining Corrective Action.  
Verifying Base Module LED Operation  
If a ATM Backbone SwitchModule LED is not illuminated, use the  
CoreBuilder 5000 Controller Module or CoreBuilder 5000 Advanced  
DMM/Controller Module LED test button to verify operation of the base  
module LEDs. The LED test does not disrupt network operation.  
 
           
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When you press the LED test button:  
1 The Controller Module initiates a test to all modules in the hub. All  
LEDs should respond by lighting continuously for approximately  
5 seconds.  
2 During this time, the bi-color LEDs should alternate between green and  
yellow approximately every ½ second.  
See Appendix B for instructions about contacting 3Com Technical  
Support for your product.  
Reading the Base Module LEDs  
Table 6-1 identifies the normal phases of operation of the base module  
LEDs upon power-on or hardware reset.  
Base Module LED Status  
Table 6-1  
Module Status  
LED State  
MOD  
STAT  
PACKET  
CHANNEL  
Prior to power-on  
Off  
Off  
Diagnostics upon power-on  
Failed diagnostics  
Yellow  
Yellow  
Green  
Off  
Green  
Green  
Yellow  
Passed diagnostics; ready to exchange data  
Receiving ATM cells and forwarding them to Green  
the packetchannel backplane  
Module problem indications during normal  
operation  
Steady yellow or Off  
Off  
*
* Refer to Determining Corrective Action.  
 
     
Troubleshooting Using LEDs 6-3  
Determining Corrective Action  
Table 6-2 identifies appropriate corrective actions for each base module  
LED indication.  
Base Module LED Corrective Actions  
Table 6-2  
LED  
LED State  
Green  
Off  
Possible Cause  
Corrective Action  
MOD STAT  
Normal operating indication.  
No power to hub.  
None required.  
Check the controller module power  
LEDs.  
The hub does not have enough Add another power supply to the hub.  
available power for a new  
Use the SHOW POWER BUDGET  
module installation.  
command to ascertain available power in  
the hub.  
The ATM Backbone  
SwitchModule is faulty.  
Insert a different ATM Backbone  
SwitchModule.  
Yellow  
Module failed power-on  
diagnostics.  
Reset ATM Backbone SwitchModule  
(page 6-12).  
Re-seat ATM Backbone SwitchModule in  
CoreBuilder 5000 hub.  
Refer to “Recovering from Problems” on  
page 6-5.  
PACKETCHANNEL  
Green  
Off  
SwitchModule is correctly  
inserted in hub and recognizes  
PacketChannel backplane.  
None required.  
ATM Backbone SwitchModule Re-seat the ATM Backbone  
is not connected to backplane. SwitchModule in the slot.  
Slot does not support  
Install the ATM Backbone SwitchModule  
in slots 1 through 8 or 13 through 17.  
PacketChannel operation. To  
verify, enter the command  
SHOW MODULE. The General  
Information field states “ATM  
Slot” if the slot is reserved for  
ATM.  
PacketChannel backplane not  
Re-install the PacketChannel backplane  
installed or incorrectly installed or purchase a PacketChannel backplane.  
in the hub. Contact your supplier.  
Yellow  
ATM Backbone SwitchModule None required.  
transmitting heavy traffic levels  
to the PacketChannel  
backplane.  
Yellow  
Blinking  
ATM Backbone SwitchModule None required.  
transmitting normal traffic  
levels to the PacketChannel  
backplane.  
 
   
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Troubleshooting ATM This section explains how to read the ATM OC-3 card LEDs and  
OC-3 Card LEDs determine appropriate corrective action  
The LEDs on the base module and ATM OC-3 cards function  
independent of each other.  
Table 6-3 identifies possible causes and corrective actions for each LED  
state.  
ATM OC-3 Card LED Corrective Actions  
Table 6-3  
LED  
LED State  
Green  
Yellow  
Off  
Possible Cause  
Corrective Action  
TX  
ATM signal detected.  
Transmitting ATM cells.  
Problem with ATM switch  
None required.  
None required.  
Check ATM switch connection and  
connection (such as cable not interface.  
connected to ATM OC-3 card).  
ATM OC-3 card failed.  
If alternate ATM OC-3 card is installed,  
check that switchover to alternate ATM  
OC-3 card occurred.  
RX  
Green  
Yellow  
Off  
ATM signal detected.  
Receiving ATM cells.  
None required.  
None required.  
Problem with ATM switch  
Check ATM switch connection and  
connection (such as cable not interface.  
connected to ATM OC-3 card).  
ATM OC-3 card failed.  
If alternate ATM OC-3 card is installed,  
check that switchover to alternate ATM  
OC-3 card occurred.  
ACTIVE  
Green  
Off  
Identifies active ATM OC-3  
card.  
None required.  
ATM OC-3 card inactive.  
ATM OC-3 card failed.  
ATM OC-3 card failed.  
If alternate ATM OC-3 card is installed,  
check that an alternate ATM OC-3 card  
is active.  
If alternate ATM OC-3 card is installed,  
check that switchover to alternate ATM  
OC-3 card occurred.  
ALARM  
Green  
Off  
If alternate ATM OC-3 card is installed,  
check that a switchover to alternate  
ATM OC-3 card occurred.  
Refer to “Recovering from Problems” on  
page 6-5.  
Normal operating condition.  
None required.  
 
     
Recovering from Problems  
6-5  
Recovering from  
Problems  
Use the following procedure to recover from operating problems or  
module failure. Each of these steps is explained in more detail in the  
sections that follow.  
1 Verify that the DMM can communicate with the ATM Backbone  
SwitchModule  
2 Verify that the correct software versions are installed.  
3 Verify that the critical configuration parameters settings of the ATM  
Backbone SwitchModule match those of the ATM switch to which it is  
connected.  
4 Verify ATM OC-3 Card Functions.  
5 Verify ATM Signalling Functions.  
6 Verify LEC Functions.  
7 Verify Bridging Configuration.  
8 Verify that a CoreBuilder 5000 SwitchModule has a vbridge configured  
on the same bridge port as the CoreBuilder 5000 ATM Backbone  
SwitchModule bridge port.  
9 Verify Data Movement.  
10 Verify ATM OC-3 Switchover Functions.  
Record your results for the following procedures. The information may  
be required if you need to contact your technical support  
representative.  
Verifying DMM To isolate a problem in the ATM Backbone SwitchModule, you must be  
Communication able to communicate with the ATM Backbone SwitchModule from the  
DMM.  
Use the following command to verify that the DMM can communicate  
with the ATM Backbone SwitchModule:  
CB5000> show module all  
Check that the display lists the ATM Backbone SwitchModule model  
number (6602M-MOD).  
 
       
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If the ATM Backbone SwitchModule model number is not listed, try  
each of the following corrective actions:  
If the DMM can communicate with the ATM Backbone SwitchModule,  
proceed to Verifying Software Versions.  
1 Reset the ATM Backbone SwitchModule by pressing the Reset button  
on the module front panel (refer to Resetting the ATM Backbone  
SwitchModule later in this chapter).  
2 Remove and carefully reinsert the ATM Backbone SwitchModule.  
3 Ensure that IP connectivity for the DMM is established. Refer to the  
CoreBuilder 5000 SwitchModule User Guide for more information.  
4 If necessary, obtain Technical Assistance (refer to Obtaining Technical  
Assistance later in this chapter).  
Verifying Software Be sure that ATM Backbone SwitchModule is using the correct software  
Versions versions for the following hub components:  
ATM Backbone SwitchModule (Model Number 6602M-MOD)  
CoreBuilder 5000 Ethernet or FDDI SwitchModule (version v3.0 or  
later)  
DMM or ADMM (version v6.0 or later)  
Use the following command to display the software versions of these  
components:  
CB5000> show module all  
Contact your network supplier to determine the correct versions of  
software and arrange to update the software if necessary.  
 
   
Recovering from Problems  
6-7  
Verifying Critical Verify that the settings of the following critical parameters match those  
Parameters of the ATM switch to which the ATM Backbone SwitchModule is  
connected:  
UNI version (default is 3.0)  
LEARP Quiet Time (default is 5 seconds)  
Configuration mode (LEC 1 default is Auto, default for other LECs is  
Manual)  
Interface mode (LEC 1 default is Enabled, default for other LECs is  
Disabled)  
ELAN Name (LEC 1 default is Admin, default for other LECs None)  
Vbridge assignment (LEC 1 default is vbridge 1, default for other  
LECs is Unassigned)  
See the CoreBuilder 5000 ATM Backbone SwitchModule Command  
Reference for more information on these parameters.  
Verifying ATM OC-3 Use the following procedure to verify each of the following ATM OC-3  
Card Functions card functions:  
1 With the OC-3 fiber cables attached, verify that the Alarm LED of the  
ATM OC-3 card is illuminated green.  
If the Alarm LED is illuminated green, reverse the fiber optic cable  
connections to the ATM OC-3 card and reverify the Alarm LED.  
2 Use the following command to check the additional port status  
indicators for the ATM OC-3 card:  
CB5000> show port <slot.phy_num>  
Verify that the display lists the following indicators:  
Status for the (PHY) port is OK  
Mode for the (PHY) port is Enabled  
 
       
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3 Use the following command to check the following SONET status  
indicators:  
CB5000> show sonet <slot.phy_num> status  
Verify that the display lists status is OK for the following indicators:  
Line Current Status  
Section Current Status  
Path Current Status  
4 Record any indications that are not as expected and proceed to  
Verifying ATM Signalling Functions.  
Verifying ATM Use the following procedure to verify ATM signaling functions:  
Signaling Functions  
1 Use the following command to check the UNI Version setting of your  
ATM Backbone SwitchModule:  
CB5000> show atm <slot> interface  
Examine the setting of the UNI Version parameter of the ATM  
Backbone SwitchModule. It must match the ATM switch setting to  
which it is connected. The valid settings are:  
3_0  
3_1  
Contact your network supplier for the UNI version setting of the ATM  
switch.  
2 If necessary, reset the UNI Version parameter and corresponding ATM  
signalling times using the following command:  
CB5000> set atm <slot> uni_version 3_1  
(or 3_0)  
3 If you made any changes in Step 2, reset the module using the  
following command:  
CB5000> reset module <slot>  
ATM commands do not take effect until you reset the module. Use the  
DMM RESET MODULE command to enable any ATM parameter changes.  
 
   
Recovering from Problems  
6-9  
4 Use the following command to display vcc parameters:  
CB5000> show atm <slot> vcc all  
Verify the following parameters settings:  
SIG is 0/5  
ILMI is 0/16  
5 If necessary, use the following command to reset the ILMI parameter:  
CB5000> set atm <slot> ilmi pvc 0/16  
ATM commands do not take effect until you reset the module. Use the  
DMM RESET MODULE command to enable any ATM parameter  
changes.  
6 If the SIG parameter is not set to 0/5, contact your network supplier to  
set the SIG parameter to 0/5 at the ATM switch.  
7 Record the final settings of your ATM signalling parameters before  
continuing.  
Verifying LEC Use the following procedure to verify the functions of a LEC:  
Functions  
1 Use the following command to display the configuration mode of the  
LEC:  
CB5000> show bport_lec <slot.lec> configuration  
If the configuration mode is manual, check the command display to  
verify that the correct LES ATM Address is listed. The LES ATM  
Address of the LEC must match the LES ATM Address of the ELAN  
to which the LEC is assigned.  
If the configuration mode is automatic, check the command display  
to verify that the ELAN Name parameter is set to the ELAN Name  
required by the ATM switch.  
Contact your ATM switch service representative to determine the  
correct LES ATM Address and ELAN Name setting.  
2 Check the command display in step 1 to verify that the Mode  
parameter for the LEC is set to Enabled.  
If the Mode parameter is not set to Enabled, use the following  
command to reset the Mode parameter to Enabled:  
CB5000> set bport_lec <slot.lec> mode enable  
 
   
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3 Use the following command to display the LAN/E status of the LEC:  
CB5000> show bport_lec <slot.lec> status  
Check the indication of the Interface State parameter. The possible  
status indications are:  
Initial  
Configure  
Join  
Bus connect  
Operational  
If the Interface State is Operational, the LEC and ATM parameters are  
configured correctly.  
If there is any other indication, record the result and continue with the  
procedure.  
4 Check the command display in step 3 and record the Last Failure State  
parameter.  
If the Last Failure State indicates:  
Configure — The ATM Backbone SwitchModule is having problems  
with the LECS. Contact your ATM switch service representative to  
verify the LECS configuration.  
Join — The ATM Backbone SwitchModule is having problems  
connecting with the LES. Contact your ATM switch service  
representative to verify the LES address and ELAN name and the  
operation of the BUS service provider.  
Bus Connect — Contact your ATM switch service representative to  
verify the operation of the BUS service provider.  
 
Recovering from Problems 6-11  
Verifying Bridging Use the following procedure to verify the bridging configuration of the  
Configuration ATM Backbone SwitchModule:  
1 Use the following command to display information about the LEC  
bridging configuration.  
CB5000> show bridge_port <slot.lec>verbose  
Verify that the bridge port is set to a valid vbridge (1 through 240).  
If the bridge port is not set to a valid vbridge, use the following  
command to reset it to the correct vbridge:  
CB5000> set bridge_port <slot.lec> vbridge <vbridgenumber>  
2 Use the following command to display information about the vbridge  
configuration:  
CB5000> show bridge_port <slot.bridgeport>  
Verify that the vbridge is assigned to the correct Ethernet or FDDI  
SwitchModule port.  
Verifying Data Use the following procedure to determine if there is packet and ATM  
Movement cell data movement through the ATM Backbone SwitchModule:  
1 Use the following command to display ATM statistics:  
CB5000> show atm <slot> statistics  
Note the values for the ATM and AAL5 ATM cell counters.  
2 Reissue the ATM statistics command and check that the counters have  
changed.  
3 Use the following command to display bridge port interface statistics:  
CB5000> show counter bridge_port <slot.lec> interface  
Note the values for the Packet Counters statistic  
4 Reissue the bridge port interface command and check that the Packet  
Counters statistic has changed.  
 
       
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Verifying ATM OC-3 If the Redundant ATM OC-3 card does not become active upon failure  
Switchover of the primary ATM OC-3, use the following command to verify that  
the PHY Automatic Failover parameter is Enabled:  
CB5000> show module <slot.phy> verbose  
If the PHY_Automatic_Failover parameter is not Enabled, use the  
following command to enable it:  
CB5000> set module <slot>.1 phy_automatic_failover enable  
If the ATM Backbone SwitchModule is still experiencing problems after  
you complete the procedures above, refer to Obtaining Technical  
Assistance later in this chapter.  
Resetting the ATM  
Backbone  
SwitchModule  
You can reset the ATM Backbone SwitchModule by either pressing the  
front panel Reset button or issuing the DMM Reset command.  
CAUTION: If you reset the ATM Backbone SwitchModule using the  
DMM RESET command, the module does not lose saved setup  
information. However, performing a reset may cause some of the data  
being transmitted at that moment to be lost and statistic counters to  
be reset to zero.  
Using the Reset Each ATM Backbone SwitchModule front panel houses a Reset button.  
Button The Reset button resets the ATM Backbone SwitchModule and executes  
power up self-test diagnostics.  
CAUTION: Use the Reset button only if you suspect a problem with the  
ATM Backbone SwitchModule. Using the Reset button to reset an ATM  
Backbone SwitchModule disrupts network traffic.  
To ensure that you do not lose any configuration information, before  
you use the Reset button:  
Save any configuration changes  
Wait at least 30 seconds after saving configuration changes  
 
           
Obtaining Technical Assistance 6-13  
Obtaining Technical  
Assistance  
You can receive assistance for installing and troubleshooting an ATM  
Backbone SwitchModule by calling either your 3Com reseller or 3Com  
network supplier. Be prepared to supply a representative with the  
following information:  
Description of the problem  
Steps you have taken to try and correct the problem  
Type and software version of the CoreBuilder 5000 management  
module being used  
Version of software installed on your ATM Backbone SwitchModule,  
Ethernet or FDDI SwitchModule, and DMM  
Status of the front panel LEDs  
Configuration of your hub. (You may find it helpful to refer to the  
Slot Usage Chart shipped with the CoreBuilder 5000 Integrated  
System Hub Installation and Operation Guide for a record of this  
information.)  
See Appendix B for instructions on how to get technical support for  
your product.  
 
   
6-14  
C
HAPTER ROUBLESHOOTING  
6: T  
 
SPECIFICATIONS  
A
This appendix lists the following specifications for the CoreBuilder 5000  
Environmental Specifications  
Mechanical Specifications  
Power Specifications  
ATM OC-3 Card Fiber Optic Specifications  
Environmental  
Specifications  
Table A-1 lists the ATM Backbone SwitchModule environmental  
specifications.  
Environmental Specifications  
Table A-1  
Specification  
Value  
Operating Temperature  
Storage Temperature  
Operating Humidity  
32 to 122 °F (0 to 50 °C)  
–40 to 151 °F (–40 to 66 °C)  
Less than 95%, noncondensing  
Mechanical  
Specifications  
Table A-2 lists the ATM Backbone SwitchModule mechanical  
specifications.  
Mechanical Specifications  
Table A-2  
Model Number  
3C96602M-MOD  
Approximate Dimensions  
Weight  
*
16 in. x 10.3 in. x 2 in.  
(40.6 cm x 26.2 cm x 5.1 cm)  
3.0 lb (1.36 kg)  
3C96601D-155SC-MM  
3.6 in. x 3.5 in. x 1.0 in.  
(9.1 cm x 8.9 cm x 2.5 cm)  
0.1 lb (0.05 kg)  
* Includes one ATM OC-3 card (3C96601D-155SC-MM) installed on the base module.  
 
           
A-2  
C
HAPTER PECIFICATIONS  
A: S  
Power  
Specifications  
Table A-3 lists the ATM Backbone SwitchModule power specifications.  
Power Specifications  
Table A-3  
Unit  
Model Number  
3C96602M-MOD  
+5 Volts +12 Volts  
*
Base Module  
60 W  
5 W  
5 W  
0 W  
Redundant ATM OC-3 Card 3C96601D-155SC-MM  
* Includes one ATM OC-3 card (3C96601D-155SC-MM) installed on the base module.  
ATM OC-3 Card  
Fiber Optic  
Specifications  
Table A-4 lists the ATM Backbone SwitchModule OC-3 fiber optic  
specifications.  
ATM Backbone SwitchModule Fiber Optic Specifications  
Table A-4  
Specification  
Fiber type  
Value  
62.5/125 µ  
1300 nm  
2 km  
Wavelength  
Maximum distance  
Transmit power  
Receive power  
–18.5 dBm  
–14 dBm  
 
     
TECHNICAL SUPPORT  
B
3Com provides easy access to technical support information through a  
variety of services. This appendix describes these services.  
Information contained in this appendix is correct at time of publication. For  
the most recent information, 3Com recommends that you access the  
3Com Corporation World Wide Web site.  
Online Technical  
Services  
3Com offers worldwide product support 24 hours a day, 7 days a week,  
through the following online systems:  
World Wide Web site  
3Com Knowledgebase Web Services  
3Com FTP site  
3Com Bulletin Board Service (3Com BBS)  
SM  
3Com Facts Automated Fax Service  
World Wide Web Site To access the latest networking information on the 3Com Corporation  
World Wide Web site, enter this URL into your Internet browser:  
http://www.3com.com/  
This service provides access to online support information such as technical  
documentation and software, as well as support options that range from  
technical education to maintenance and professional services.  
3Com This interactive tool contains technical product information compiled by  
Knowledgebase Web 3Com expert technical engineers around the globe. Located on the World  
Services Wide Web at http://knowledgebase.3com.com, this service gives all  
3Com customers and partners complementary, round-the-clock access to  
technical information on most 3Com products.  
 
                   
B-2  
A
B: T  
S
PPENDIX  
ECHNICAL UPPORT  
3Com FTP Site Download drivers, patches, software, and MIBs across the Internet from the  
3Com public FTP site. This service is available 24 hours a day, 7 days a week.  
To connect to the 3Com FTP site, enter the following information into  
your FTP client:  
Hostname: ftp.3com.com  
Username: anonymous  
Password: <your Internet e-mail address>  
You do not need a user name and password with Web browser software  
such as Netscape Navigator and Internet Explorer.  
3Com Bulletin Board The 3Com BBS contains patches, software, and drivers for 3Com products.  
Service This service is available through analog modem or digital modem (ISDN)  
24 hours a day, 7 days a week.  
Access by Analog Modem  
To reach the service by modem, set your modem to 8 data bits, no parity,  
and 1 stop bit. Call the telephone number nearest you:  
Country  
Australia  
Brazil  
Data Rate  
Telephone Number  
61 2 9955 2073  
55 11 5181 9666  
33 1 6986 6954  
4989 62732 188  
852 2537 5601  
39 2 27300680  
81 3 5977 7977  
52 5 520 7835  
Up to 14,400 bps  
Up to 28,800 bps  
Up to 14,400 bps  
Up to 28,800 bps  
Up to 14,400 bps  
Up to 14,400 bps  
Up to 14,400 bps  
Up to 28,800 bps  
Up to 14,400 bps  
Up to 14,400 bps  
Up to 28,800 bps  
Up to 53,333 bps  
France  
Germany  
Hong Kong  
Italy  
Japan  
Mexico  
P.R. of China  
Taiwan, R.O.C.  
U.K.  
86 10 684 92351  
886 2 377 5840  
44 1442 438278  
1 847 262 6000  
U.S.A.  
 
         
Support from Your Network Supplier  
B-3  
Access by Digital Modem  
ISDN users can dial in to the 3Com BBS using a digital modem for fast  
access up to 64 Kbps. To access the 3Com BBS using ISDN, call the  
following number:  
1 847 262 6000  
3Com Facts The 3Com Facts automated fax service provides technical articles,  
Automated Fax diagrams, and troubleshooting instructions on 3Com products 24 hours a  
Service day, 7 days a week.  
Call 3Com Facts using your Touch-Tone telephone:  
1 408 727 7021  
Support from Your  
Network Supplier  
If you require additional assistance, contact your network supplier. Many  
suppliers are authorized 3Com service partners who are qualified to  
provide a variety of services, including network planning, installation,  
hardware maintenance, application training, and support services.  
When you contact your network supplier for assistance, have the  
following information ready:  
Product model name, part number, and serial number  
A list of system hardware and software, including revision levels  
Diagnostic error messages  
Details about recent configuration changes, if applicable  
If you are unable to contact your network supplier, see the following  
section on how to contact 3Com.  
Support from 3Com  
If you are unable to obtain assistance from the 3Com online technical  
resources or from your network supplier, 3Com offers technical telephone  
support services. To find out more about your support options, call the  
3Com technical telephone support phone number at the location nearest  
you.  
 
           
B-4  
A
B: T  
S
PPENDIX  
ECHNICAL UPPORT  
When you contact 3Com for assistance, have the following information  
ready:  
Product model name, part number, and serial number  
A list of system hardware and software, including revision levels  
Diagnostic error messages  
Details about recent configuration changes, if applicable  
Here is a list of worldwide technical telephone support numbers:  
Country  
Telephone Number  
Country  
Telephone Number  
Asia, Pacific Rim  
Australia  
Hong Kong  
India  
Indonesia  
Japan  
Malaysia  
New Zealand  
Pakistan  
Philippines  
1 800 678 515  
800 933 486  
P.R. of China  
10800 61 00137 or  
021 6350 1590  
800 6161 463  
+61 2 9937 5085  
001 800 61 009  
0031 61 6439  
1800 801 777  
0800 446 398  
+61 2 9937 5085  
1235 61 266 2602  
Singapore  
S. Korea  
From anywhere in S. Korea: 00798 611 2230  
From Seoul:  
Taiwan, R.O.C.  
Thailand  
(0)2 3455 6455  
0080 611 261  
001 800 611 2000  
Europe  
From anywhere in Europe, call: +31 (0)30 6029900 phone  
+31 (0)30 6029999 fax  
Europe, South Africa, and Middle East  
From the following countries, you may use the toll-free numbers:  
Austria  
Belgium  
Denmark  
Finland  
France  
Germany  
Hungary  
Ireland  
Israel  
0800 297468  
0800 71429  
800 17309  
0800 113153  
0800 917959  
0800 1821502  
00800 12813  
1800 553117  
1800 9453794  
1678 79489  
Netherlands  
Norway  
Poland  
Portugal  
South Africa  
Spain  
Sweden  
Switzerland  
U.K.  
0800 0227788  
800 11376  
00800 3111206  
0800 831416  
0800 995014  
900 983125  
020 795482  
0800 55 3072  
0800 966197  
Italy  
Latin America  
Argentina  
Brazil  
Chile  
Colombia  
AT&T +800 666 5065  
0800 13 3266  
1230 020 0645  
98012 2127  
Mexico  
Peru  
Puerto Rico  
Venezuela  
01 800 CARE (01 800 2273)  
AT&T +800 666 5065  
800 666 5065  
AT&T +800 666 5065  
North America  
1 800 NET 3Com  
(1 800 638 3266)  
Enterprise Customers:  
1 800 876-3266  
 
Returning Products for Repair  
B-5  
Returning Products  
for Repair  
Before you send a product directly to 3Com for repair, you must first  
obtain an authorization number. Products sent to 3Com without  
authorization numbers will be returned to the sender unopened, at the  
senders expense.  
To obtain an authorization number, call or fax:  
Country  
Telephone Number  
+ 65 543 6500  
Fax Number  
Asia, Pacific Rim  
+ 65 543 6348  
+ 31 30 6029999  
Europe, South Africa, and  
Middle East  
+ 31 30 6029900  
Latin America  
1 408 326 2927  
1 408 326 3355  
From the following countries, you may call the toll-free numbers; select option 2 and  
then option 2:  
Austria  
0800 297468  
0800 71429  
800 17309  
Belgium  
Denmark  
Finland  
France  
Germany  
Hungary  
Ireland  
0800 113153  
0800 917959  
0800 1821502  
00800 12813  
1800553117  
1800 9453794  
1678 79489  
0800 0227788  
800 11376  
00800 3111206  
0800 831416  
0800 995014  
900 983125  
020 795482  
0800 55 3072  
0800 966197  
Israel  
Italy  
Netherlands  
Norway  
Poland  
Portugal  
South Africa  
Spain  
Sweden  
Switzerland  
U.K.  
U.S.A. and Canada  
1 800 NET 3Com  
(1 800 638 3266)  
1 408 326 7120  
(not toll-free)  
Enterprise Customers:  
1 800 876 3266  
 
   
B-6  
A
B: T  
S
PPENDIX  
ECHNICAL UPPORT  
 
INDEX  
1
INDEX  
Numbers  
3Com bulletin board service (3Com BBS) B-2  
3Com Facts B-3  
C
Configuration  
ATM 3-7  
3Com URL B-1  
basic 1-10  
dual-homing 1-11, 1-12  
A
ADMM  
Architecture 1-4  
ATM  
module redundancy 1-12  
process components 3-6  
redundancy 3-9  
tools 3-1  
Forum LANE 1.0 1-4  
Forum specification compliance 1-2  
MIB 1-4  
slot restrictions 1-8  
type 1-8  
ATM Backbone SwitchModule  
Defaults  
ATM OC-3 card  
configuration 3-7  
DMM  
primary 1-5  
redundant 1-5, 3-9  
verifying functions 6-7  
ATM Signaling  
access 3-2  
TELNET access 3-5  
verifying communication 6-5  
version required 3-2  
B
Environmental specifications A-1  
Backplane 1-8, 1-9  
Bridge  
F
configuring 3-6  
Bridge MIB 1-4  
Bridging  
Fax service (3Com Facts) B-3  
Features 1-1  
verifying configuration 6-11  
Bulletin board service B-2  
 
 
2
I
H
N
Hardware  
Network supplier support B-3  
Hot swapping 1-3  
I
IEEE  
Packets  
Parameters  
verifying 6-7  
redundancy 1-2  
Problems  
802.1D 1-4  
802.3 1-4  
Spanning Tree Protocol 1-4  
Translation 1-4  
Installing  
Interfaces  
MIB 1-4  
L
LANE  
R
configuring 3-6, 3-8  
data exchange 2-5  
configuring 3-9  
PHY 1-2  
LANE components  
general 2-3  
Resetting  
RFC  
LECs  
LEDs  
1157 1-4  
1213 1-4  
1493 1-4  
troubleshooting ATM OC-3 card 6-4  
1573 1-4  
1595 1-4  
1695 1-4  
M
MIB  
ATM 1-4  
Simple Network Management Protocol 1-4  
ATM Forum LEC 1-4  
Bridge 1-4  
SNMP 3-4  
II 1-4  
MIB 1-4  
Interface 1-4  
SNMP 1-4  
Software Architecture and Virtual Bridge Ports 5-1  
Software versions  
verifying 6-6  
SONET  
SONET 1-4  
MIBs B-2  
MIB 1-4  
 
INDEX  
3
Spanning Tree Protocol  
Specifications  
Windows 3-3  
Translation  
IEEE 802.1H 1-4  
environmental A-1  
power A-2  
ATM OC-3 card LEDs 6-4  
base module LEDs 6-1  
Status  
verifying Bridgeport-LEC 3-9  
SwitchChannel backplane  
description 1-8  
SwitchModules  
supported 1-3  
Switchover  
recovering from problems 6-5  
U
URL B-1  
Verifying  
T
ATM signaling functions 6-8  
critical parameters 6-7  
data movement 6-11  
DMM communication 6-5  
Technical assistance  
Technical support  
3Com URL B-1  
software versions 6-6  
Virtual channel connections (VCC)  
types 2-7  
TELNET  
Tools  
W
advanced management 3-2  
configuration 3-1  
third-party 3-4  
World Wide Web (WWW) B-1  
Transcend Network Control Services for  
UNIX 3-2  
Transcend Network Management Software for  
Windows 3-3  
 
4
I
NDEX  
 
3Com Corporation LIMITED WARRANTY  
CoreBuilder® 5000 ATM Backbone SwitchModule  
HARDWARE  
3Com warrants to the end user (“Customer”) that this hardware product will be free from defects in  
workmanship and materials, under normal use and service, for one (1) year from the date of purchase from  
3Com or its authorized reseller.  
3Com’s sole obligation under this express warranty shall be, at 3Com’s option and expense, to repair the  
defective product or part, deliver to Customer an equivalent product or part to replace the defective item, or  
if neither of the two foregoing options is reasonably available, 3Com may, in its sole discretion, refund to  
Customer the purchase price paid for the defective product. All products that are replaced will become the  
property of 3Com. Replacement products may be new or reconditioned. 3Com warrants any replaced or  
repaired product or part for ninety (90) days from shipment, or the remainder of the initial warranty period,  
whichever is longer.  
SOFTWARE  
3Com warrants to Customer that each software program licensed from it will perform in substantial  
conformance to its program specifications, for a period of ninety (90) days from the date of purchase from  
3Com or its authorized reseller. 3Com warrants the media containing software against failure during the  
warranty period. No updates are provided. 3Com's sole obligation under this express warranty shall be, at  
3Com's option and expense, to refund the purchase price paid by Customer for any defective software  
product, or to replace any defective media with software which substantially conforms to applicable 3Com  
published specifications. Customer assumes responsibility for the selection of the appropriate applications  
program and associated reference materials. 3Com makes no warranty or representation that its software  
products will meet Customer’s requirements or work in combination with any hardware or applications  
software products provided by third parties, that the operation of the software products will be  
uninterrupted or error free, or that all defects in the software products will be corrected. For any third-party  
products listed in the 3Com software product documentation or specifications as being compatible, 3Com  
will make reasonable efforts to provide compatibility, except where the non-compatibility is caused by a  
“bug” or defect in the third party's product or from use of the software product not in accordance with  
3Com’s published specifications or user manual.  
THIS 3COM PRODUCT MAY INCLUDE OR BE BUNDLED WITH THIRD-PARTY SOFTWARE, THE USE OF WHICH  
IS GOVERNED BY A SEPARATE END USER LICENSE AGREEMENT. THIS 3COM WARRANTY DOES NOT APPLY  
TO SUCH THIRD-PARTY SOFTWARE. FOR THE APPLICABLE WARRANTY, PLEASE REFER TO THE END USER  
LICENSE AGREEMENT GOVERNING THE USE OF SUCH SOFTWARE.  
YEAR 2000 WARRANTY  
See the 3Com Year 2000 Web site at http://www.3com.com/products/yr2000.html  
OBTAINING WARRANTY  
SERVICE  
Customer must contact a 3Com Corporate Service Center or an Authorized 3Com Service Center within the  
applicable warranty period to obtain warranty service authorization. Dated proof of purchase from 3Com or  
its authorized reseller may be required. Products returned to 3Com's Corporate Service Center must be  
pre-authorized by 3Com with a Return Material Authorization (RMA) number or User Service Order (USO)  
number marked on the outside of the package, and sent prepaid and packaged appropriately for safe  
shipment, and it is recommended that they be insured or sent by a method that provides for tracking of the  
package. Responsibility for loss or damage does not transfer to 3Com until the returned item is received by  
3Com. The repaired or replaced item will be shipped to Customer, at 3Com's expense, not later than thirty  
(30) days after 3Com receives the defective product.  
3Com shall not be responsible for any software, firmware, information, or memory data of Customer  
contained in, stored on, or integrated with any products returned to 3Com for repair, whether under  
warranty or not.  
Dead- or Defective-on-Arrival  
. In the event a product completely fails to function or exhibits a defect in  
materials or workmanship within the first forty-eight (48) hours of installation but no later than thirty (30)  
days after the date of purchase, and this is verified by 3Com, it will be considered dead- or  
defective-on-arrival (DOA) and a replacement shall be provided by advance replacement. The replacement  
product will normally be shipped not later than three (3) business days after 3Com’s verification of the DOA  
product, but may be delayed due to export or import procedures. The shipment of advance replacement  
products is subject to local legal requirements and may not be available in all locations. When an advance  
replacement is provided and Customer fails to return the original product to 3Com within fifteen (15) days  
after shipment of the replacement, 3Com will charge Customer for the replacement product, at list price.  
INCLUDED SERVICES:  
Telephone Support,  
with coverage for basic troubleshooting only, will be provided for ninety (90) days from  
the date of purchase, on a commercially reasonable efforts basis. Please refer to the Technical Support  
appendix in the Getting Started Guide for telephone numbers.  
3Com’s Web and Bulletin Board Services  
provide 3Knowledgebase, bug tracking, documentation, release  
notes, and some software maintenance releases at no charge.  
 
 
WARRANTIES EXCLUSIVE  
IF A 3COM PRODUCT DOES NOT OPERATE AS WARRANTED ABOVE, CUSTOMER'S SOLE REMEDY FOR  
BREACH OF THAT WARRANTY SHALL BE REPAIR, REPLACEMENT, OR REFUND OF THE PURCHASE PRICE  
PAID, AT 3COM'S OPTION. TO THE FULL EXTENT ALLOWED BY LAW, THE FOREGOING WARRANTIES AND  
REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER WARRANTIES, TERMS, OR CONDITIONS,  
EXPRESS OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW, STATUTORY OR OTHERWISE, INCLUDING  
WARRANTIES, TERMS, OR CONDITIONS OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,  
SATISFACTORY QUALITY, CORRESPONDENCE WITH DESCRIPTION, AND NON-INFRINGEMENT, ALL OF  
WHICH ARE EXPRESSLY DISCLAIMED. 3COM NEITHER ASSUMES NOR AUTHORIZES ANY OTHER PERSON TO  
ASSUME FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE OR  
USE OF ITS PRODUCTS.  
3COM SHALL NOT BE LIABLE UNDER THIS WARRANTY IF ITS TESTING AND EXAMINATION DISCLOSE THAT  
THE ALLEGED DEFECT OR MALFUNCTION IN THE PRODUCT DOES NOT EXIST OR WAS CAUSED BY  
CUSTOMER'S OR ANY THIRD PERSON'S MISUSE, NEGLECT, IMPROPER INSTALLATION OR TESTING,  
UNAUTHORIZED ATTEMPTS TO OPEN, REPAIR OR MODIFY THE PRODUCT, OR ANY OTHER CAUSE BEYOND  
THE RANGE OF THE INTENDED USE, OR BY ACCIDENT, FIRE, LIGHTNING, POWER CUTS OR OUTAGES,  
OTHER HAZARDS, OR ACTS OF GOD.  
LIMITATION OF LIABILITY  
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,  
CONSEQUENTIAL, INDIRECT, SPECIAL, OR PUNITIVE DAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE OR  
PROFITS, LOSS OF BUSINESS, LOSS OF INFORMATION OR DATA, OR OTHER FINANCIAL LOSS ARISING OUT  
OF OR IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE, USE, PERFORMANCE, FAILURE, OR  
INTERRUPTION OF ITS PRODUCTS, EVEN IF 3COM OR ITS AUTHORIZED RESELLER HAS BEEN ADVISED OF THE  
POSSIBILITY OF SUCH DAMAGES, AND LIMITS ITS LIABILITY TO REPAIR, REPLACEMENT, OR REFUND OF THE  
PURCHASE PRICE PAID, AT 3COM'S OPTION. THIS DISCLAIMER OF LIABILITY FOR DAMAGES WILL NOT BE  
AFFECTED IF ANY REMEDY PROVIDED HEREIN SHALL FAIL OF ITS ESSENTIAL PURPOSE.  
DISCLAIMER  
Some countries, states, or provinces do not allow the exclusion or limitation of implied warranties or the  
limitation of incidental or consequential damages for certain products supplied to consumers, or the  
limitation of liability for personal injury, so the above limitations and exclusions may be limited in their  
application to you. When the implied warranties are not allowed to be excluded in their entirety, they will be  
limited to the duration of the applicable written warranty. This warranty gives you specific legal rights which  
may vary depending on local law.  
GOVERNING LAW  
This Limited Warranty shall be governed by the laws of the State of California, U.S.A., excluding its conflicts  
of laws principles and excluding the United Nations Convention on Contracts for the International Sale of  
Goods.  
3Com Corporation  
5400 Bayfront Plaza  
P.O. Box 58145  
Santa Clara, CA 95052-8145  
(408) 326-5000  
 

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