Cisco 2950 Software Configuration Guide - Page 636
Enabling Debugging on a Specific Feature, Enabling All-System Diagnostics
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Using Debug Commands Chapter 32 Troubleshooting 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, refer to 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 EtherChannel: Switch# debug etherchannel 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 that you want to monitor. Use the show running-config command to verify the configuration. • Even if the switch is properly configured, it might not generate the type of traffic that 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 EtherChannel, enter this command in privileged EXEC mode: Switch# no debug etherchannel Alternately, in privileged EXEC mode, you can enter the undebug form of the command: Switch# undebug etherchannel To display the state of each debugging option, enter this command in privileged EXEC mode: Switch# show debugging Enabling All-System Diagnostics Beginning in privileged EXEC mode, enter this command to enable all-system diagnostics: Switch# debug all Caution Because debugging output takes priority over other network traffic, and because the debug all privileged EXEC command generates more output than any other debug command, it can severely diminish switch performance or even render it unusable. In virtually all cases, it is best to use more specific debug commands. 32-20 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10
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