Configuring Syslog

Router(config)#logging on	Enables logging to all supported destinations
Router(config)#logging 192.168.10.53	Logging messages will be sent to a syslog server host at address 192.168.10.53
Router(config)#logging sysadmin	Logging messages will be sent to a syslog server host named sysadmin
Router(config)#logging trap x	Sets the syslog server logging level to value x, where x is a number between 0 and 7 or a word defining the level. The table that follows provides more details
Router(config)#service timestamps log datetime	Syslog messages will now have a timestamp included

There are eight levels of severity in logging messages, as follows:

0	Emergencies	System is unusable
1	Alerts	Immediate action needed
2	Critical	Critical conditions
3	Errors	Error conditions
4	Warnings	Warning conditions
5	Notifications	Normal but significant conditions
6	Informational	Informational messages (default level)
7	Debugging	Debugging messages

Setting a level means you will get that level and everything below it. Level 6 means you will receive level 6 and 7 messages. Level 4 means you will get levels 4 through 7.