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C-3
Troubleshooting
Contents
Customizing show tech Command Output . . . . . . . . . . . . . . . . . C-69
CLI: Viewing More Information on Switch Operation . . . . . . . . . . . C-72
Pattern Matching When Using the Show Command . . . . . . . . . C-73
CLI: Useful Commands for Troubleshooting Sessions . . . . . . . . . . . C-76
Restoring the Factory-Default Configuration . . . . . . . . . . . . . . . . . C-77
CLI: Resetting to the Factory-Default Configuration . . . . . . . . . . . . C-77
Clear/Reset: Resetting to the Factory-Default Configuration . . . . . C-77
Restoring a Flash Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-78
DNS Resolver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-80
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-80
Basic Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-81
Configuring and Using DNS Resolution with
DNS-Compatible Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-82
Configuring a DNS Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-83
Example Using DNS Names with Ping and Traceroute . . . . . . . . . . C-84
Viewing the Current DNS Configuration . . . . . . . . . . . . . . . . . . . . . . C-86
Operating Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-87
Event Log Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-88