There is a magical feature in switches, routers and much other equipment allows you to view and save logging to a central server.
When viewing the logs you will see them with a number appended next to them, this number is directly corresponding to the severity of the logged message.
In the next table, you can see the levels (reguarding cisco equipment) along-side their description.
| Levels | Description |
| 0 | Emergency |
| 1 | Alerts |
| 2 | Critical |
| 3 | Errors |
| 4 | Warning |
| 5 | Notification |
| 6 | Informational |
| 7 | Debugging |
The following will be a description for each of the levels.
Emergency – Level (0)
The systems are unusable. Immediate response is required, a further assessment is needed.
Alert – Level (1)
Immediate action is required to prevent system failure.
Critical – Level (2)
A critical component has failed. Immediate action is required to mitigate the damage and restore system functionality.
Error – Level (3)
A general error has occurred. It is not critical for system functionality, but it affects how the system operates.
Warning – Level (4)
A potential issue has been detected. Addressing it promptly will help with network stability and longevity.
Notification – Level (5)
A normal event that does not require action. This provides information about the systems status.
Informational – Level (6)
A general informational message provides you with information about actions the system is performing.
Debugging – Level (7)
Provides detail network activity for troubleshooting. Used to monitor the networks activity.
To remember things like that I like to use acronyms.
Here is a useful acronym I found about the 8 levels of cisco syslog messages.
Every Alret Could Easily Warn Nearby Inactive Devices.
I hope this helps you as it helped me.
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