| Router(config)#logging on | Enables logging to all supported destinations |
| Router(config)#logging 10.10.10.1 | Logging messages will be sent to a syslog server host at address 10.10.10.1 |
| Router(config)#logging admin | Logging messages will be sent to a syslog server host named admin |
| 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:
| 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.
