To display Cisco debug output on the current SSH or Telnet session
switch# logging on // enabled by default
switch# logging monitor //command to enable logging on VTY lines
switch# terminal monitor //unless you issue this command, you cannot see logs on your SSH or Telnet sessions.
To turn off Cisco debug output on the current SSH or Telnet session
switch# no terminal monitor
To display Cisco debug output on the Console
switch# logging console
To turn off Cisco debug output
switch# no logging console
Log Levels
| 0 | Emergencies | System shutting down due to missing fan tray |
| 1 | Alerts | Temperature limit exceeded |
| 2 | Critical | Memory allocation failures |
| 3 | Errors | Interface Up/Down messages |
| 4 | Warnings | Configuration file written to server, via SNMP request |
| 5 | Notifications | Line protocol Up/Down |
| 6 | Information | Access-list violation logging |
| 7 | Debugging | Debug messages |
The default logging level for Console and VTY lines is Debugging. hence there were no log level mentioned in the above commands. If you would like to keep only Information logs, then issue commands as
switch# logging monitor information
switch# logging console information
In this case, Debugging logs will not be shown.
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