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Troubleshooting
Contents
Customizing show tech Command Output . . . . . . . . . . . . . . . . . C-74
CLI: Viewing More Information on Switch Operation . . . . . . . . . . . C-78
Pattern Matching When Using the Show Command . . . . . . . . . C-79
CLI: Useful Commands for Troubleshooting Sessions . . . . . . . . . . . C-82
Restoring the Factory-Default Configuration . . . . . . . . . . . . . . . . . C-83
CLI: Resetting to the Factory-Default Configuration . . . . . . . . . . . . C-83
Clear/Reset: Resetting to the Factory-Default Configuration . . . . . C-83
Restoring a Flash Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-84
DNS Resolver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-87
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-87
Basic Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-88
Configuring and Using DNS Resolution with
DNS-Compatible Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-89
Configuring a DNS Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-90
Example Using DNS Names with Ping and Traceroute . . . . . . . . . . C-91
Viewing the Current DNS Configuration . . . . . . . . . . . . . . . . . . . . . . C-93
Operating Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-94
Event Log Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-95
Locator LED (Locating a Switch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-96
C-3