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About This Manual

About This Manual

This section introduces the Debug Command Reference publication audience and scope, organization, use, and conventions.

All Cisco technical documentation and additional literature are available on the Documentation CD-ROM. The Cisco Documentation CD-ROM is updated and shipped monthly, so it might be more up-to-date than printed documentation. The CD is available both as a single CD and as an annual subscription. To order the CD, contact your local sales representative or call Cisco Customer Service.

You can also access Cisco technical documentation on the World Wide Web URL http://www.cisco.com.

Audience and Scope

This publication addresses the network or system administrator who maintains Cisco routers and access servers running Cisco IOS software.

Readers should know how to configure a Cisco router and should be familiar with the protocols and media their routers are configured to support. Readers must also be aware of their network topology.

Document Organization and Use

The Debug Command Reference publication provides information about using debug commands to troubleshoot Cisco network servers. This manual is most effective when used with the Internetwork Troubleshooting Guide publication.

Chapter 1, "Using Debug Commands," explains how you enter debug commands, use the debug  ? and debug all commands, and generate and redirect debug command output. Read this chapter first before proceeding to Chapter 3, "Debug Commands."

Chapter 2, "Conditionally Triggered Debugging," describes how you can enable a router to generate debugging messages for packets entering or leaving the router on a specified interface; by default, debugging is enabled on all interfaces.

Chapter 3, "Debug Commands," presents reference information on commands you use to debug your internetwork. The chapter includes command function descriptions, sample output displays, and explanations of these displays.

Appendix A, "X.25 Cause and Diagnostic Codes," lists the codes that can appear in output from the debug x25 all, debug x25 events, and debug x25 vc commands.

Appendix B, "ISDN Switch Types, Codes, and Values," lists the supported ISDN switch types. It also contains the ISDN cause codes, cause values, bearer capability values, and progress values that can appear in output from the debug isdn q921, debug isdn q931, and debug isdn event commands.

Document Conventions

The command descriptions in this manual use these conventions:

The samples use these conventions:


Note Means reader take note. Notes contain helpful suggestions, or reference to materials not covered in this manual.
Caution Means reader be careful. In this situation, you might do something that could result in equipment damage or loss of data.

Within the Cisco IOS software documentation, the term router is used to refer to both access servers and routers. When a feature is supported on the access server only, the term access server is used. When a feature is supported on one or more specific router platforms (such as the Cisco 4500), but not on other platforms (such as the Cisco 2500), the text specifies the platforms supported.

Within examples, routers and access servers may be alternately shown. These products are used only for example purposes---an example that shows one product does not indicate that the other product is not supported.


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