Name: Cisco IE 3000
Brand: Cisco
Rating: 5 (1 reviews)

To Next Page

To Previous Page

34-14

Cisco IE 3000 Switch Software Configuration Guide

OL-13018-01

Chapter 34 Troubleshooting

Using Debug Commands

• Troubleshooting a connection between two devices when a link cannot be established or when it is

not operating properly

Running TDR and Displaying the Results

To run TDR, enter the test cable-diagnostics tdr interface interface-id privileged EXEC command:

To display the results, enter the show cable-diagnostics tdr interface interface-id privileged EXEC

command. For a description of the fields in the display, see the command reference for this release.

Using Debug Commands

These sections explains how you use debug commands to diagnose and resolve internetworking

problems:

• Enabling Debugging on a Specific Feature, page 34-14

• Enabling All-System Diagnostics, page 34-15

• Redirecting Debug and Error Message Output, page 34-15

Caution Because debugging output is assigned high priority in the CPU process, it can render the system

unusable. For this reason, use debug commands only to troubleshoot specific problems or during

troubleshooting sessions with Cisco technical support staff. It is best to use debug commands during

periods of lower network traffic and fewer users. Debugging during these periods decreases the

likelihood that increased debug command processing overhead will affect system use.

Note For complete syntax and usage information for specific debug commands, see the command reference

for this release.

Enabling Debugging on a Specific Feature

All debug commands are entered in privileged EXEC mode, and most debug commands take no

arguments. For example, beginning in privileged EXEC mode, enter this command to enable the

debugging for Switched Port Analyzer (SPAN):

Switch# debug span-session

The switch continues to generate output until you enter the no form of the command.

If you enable a debug command and no output appears, consider these possibilities:

• The switch might not be properly configured to generate the type of traffic you want to monitor. Use

the show running-config command to check its configuration.

• Even if the switch is properly configured, it might not generate the type of traffic you want to

monitor during the particular period that debugging is enabled. Depending on the feature you are

debugging, you can use commands such as the TCP/IP ping command to generate network traffic.

To disable debugging of SPAN, enter this command in privileged EXEC mode:

Switch# no debug span-session

Cisco IE 3000 User Manual

Other manuals for Cisco IE 3000