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This preface describes the purpose, audience, organization, and conventions for the ATM and Layer 3 Switch Router Troubleshooting Guide and provides information on how
to obtain related documentation.
Failures in internetworks are characterized by certain symptoms. These symptoms might be general (clients that are unable to access specific servers) or more specific (routes that are not in the routing table). Each symptom can be traced to one or more problems or causes by using specific troubleshooting tools and techniques. Once you know what the problem is, you can take steps to fix it.
The goal of this guide is to help you isolate and resolve the most common connectivity and performance problems with your Cisco switch router. This guide describes how to define symptoms, identify problems, and implement solutions in Cisco switch router environments. This guide does not describe troubleshooting router connections and configurations. For router troubleshooting refer to the Internetwork Troubleshooting Guide.
This preface describes who should read the ATM and Layer 3 Switch Router Troubleshooting Guide, how it is organized, and its document conventions.
This publication is a stand-alone document for experienced network administrators responsible for configuring and maintaining the ATM and Layer 3 switch router.
Administrators should have hands-on experience in configuring, administering, and troubleshooting a network, should know how to configure routers, switches, and other internetwork devices, and should be familiar with the protocols and media that their hardware supports. Awareness of the basic topology of their network is also essential.
The major sections of this guide are as follows:
| Chapter | Title | Description |
|---|---|---|
Contains an overview of the switch router troubleshooting features and functions | ||
Describes the wide variety of tools available to assist you in troubleshooting your internetwork | ||
Describes the first steps you should take when you start troubleshooting your switch router | ||
Describes the example network used to illustrate the hardware and configuration troubleshooting problems throughout this guide | ||
Presents troubleshooting information for connectivity and performance problems of physical interfaces of switch routers | ||
Presents troubleshooting information for connectivity and performance problems in ATM switching network connections | ||
Presents troubleshooting information for connectivity and performance problems in LAN emulation switching environments | ||
Presents troubleshooting information for connectivity and performance problems in tag switching environments | ||
Presents troubleshooting information for connectivity problems in circuit emulation service (CES) environments and network clocking | ||
Part 2, Layer 3-to-Layer 3 Connection Troubleshooting | ||
Troubleshooting Ethernet, ATM Uplink, and POS Uplink Interfaces | Presents troubleshooting information about connectivity and performance problems in the Ethernet physical interfaces of a switch router. | |
Presents troubleshooting information about connectivity and performance problems in the Layer 3 network connections of the Layer 3 enabled ATM switch router | ||
Presents troubleshooting information about connectivity and performance problems in the Layer 2 network connections of an ATM switch router | ||
Part 3, Layer 3-to-ATM Connection Troubleshooting | ||
Presents troubleshooting information about connectivity and performance problems in the ATM router module | ||
Part 4, Appendixes | ||
Describes helpful debug commands to use when troubleshooting your switch router | ||
Presents troubleshooting information relating to security implementations | ||
Describes the various ATM cell types and their configuration that can be helpful when troubleshooting your switch router | ||
Describes procedures used to obtain a full copy of the memory image (or core dump) to identify the cause of a crash | ||
Describes the process used to contact and provide your technical support representative with the information about the symptoms and the problem | ||
Use the following books as supplements to this guide:
This document uses the following conventions:
| Convention | Description |
|---|---|
boldface font | Commands and keywords are in boldface. |
italic font | Arguments for which you supply values are in italics. |
[ ] | Elements in square brackets are optional. |
{ x | y | z } | Alternative keywords are grouped in braces and separated by vertical bars. |
[ x | y | z ] | Optional alternative keywords are grouped in brackets and separated by vertical bars. |
string | A nonquoted set of characters. Do not use quotation marks around the string or the string will include the quotation marks. |
| Terminal sessions and information the system displays are in |
boldface screen font | Information you must enter is in boldface screen font. |
italic screen font | Arguments for which you supply values are in italic screen font. |
| This pointer highlights an important line of text in an example. |
^ | The symbol ^ represents the key labeled Control—for example, the key combination ^D in a screen display means hold down the Control key while you press the D key. |
< > | Nonprinting characters, such as passwords are in angle brackets. |
Notes use the following convention:
 |
Note Means reader take note. Notes contain helpful suggestions or references to material not covered in the publication. |
Cautions use the following convention:
 |
Caution Means reader be careful. In this situation, you might do something that could result in equipment damage or loss of data. |
The following sections provide sources for obtaining documentation from Cisco Systems.
You can access the most current Cisco documentation on the World Wide Web at the following sites:
Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM is updated monthly and may be more current than printed documentation. The CD-ROM package is available as a single unit or as an annual subscription.
Cisco documentation is available in the following ways:
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You can e-mail your comments to bug-doc@cisco.com.
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We appreciate your comments.
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Cisco.com provides a broad range of features and services to help customers and partners streamline business processes and improve productivity. Through Cisco.com, you can find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online technical support, download and test software packages, and order Cisco learning materials and merchandise. Valuable online skill assessment, training, and certification programs are also available.
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To access Cisco.com, refer to the following website:
The Cisco TAC website is available to all customers who need technical assistance with a Cisco product or technology that is under warranty or covered by a maintenance contract.
If you have a priority level 3 (P3) or priority level 4 (P4) problem, contact TAC by going to the TAC website:
P3 and P4 level problems are defined as follows:
In each of the above cases, use the Cisco TAC website to quickly find answers to your questions.
To register for Cisco.com, refer to the following website:
http://www.cisco.com/register/
If you cannot resolve your technical issue by using the TAC online resources, Cisco.com registered users can open a case online by using the TAC Case Open tool at the following website:
http://www.cisco.com/tac/caseopen
If you have a priority level 1(P1) or priority level 2 (P2) problem, contact TAC by telephone and immediately open a case. To obtain a directory of toll-free numbers for your country, refer to the following website:
http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml
P1 and P2 level problems are defined as follows:
Posted: Mon Sep 30 13:28:23 PDT 2002
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