The above example indicates the logging for the console, monitor, and buffer are set to the debugging level, but trap logging is set to the informational level. Because the debugging level is the highest level, more messages are logged at the debugging level than are logged at the informational level.
Trap logging is used for sending log messages to an external syslog server. Therefore, in this case, some log messages which are seen on the console (Console logging), during a Telnet session (Monitor logging), or on the internal buffer through the show logging command (Buffer logging), are not seen on the syslog server.
In order to change the logging level, issue one of these global configuration logging commands: