Intepreting Cisco Switch and Router Logs - please help

I am brand new to log analysis and I came across some Cisco Switch and Rout er logs (that require me to analyse them). The logs contain 4 fields;the fi rst three were easy to fathom (Datetime, error severity, source IP) but the fourth is not. I have scoured the internet looking for explanation but hav e been unable to get any. Could somebody please explain what the following means, for example:

2464: 006077: Dec 28 22:35:12: %LINK-3-UPDOWN: Interface FastEthernet0/33, changed state to up What do the numbers (2464, 006077) mean ? What does 'LINK-3-UPDOWN' mean ? What does 'changed state to up' mean ?


18312: 5w4d: %LINK-3-UPDOWN: Interface FastEthernet0/12, changed state to d own Many thanks in advance.
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The numbers are an artefact of your logging system, though looking at the second line the second field looks like some kind of timestamp - uptime? time since logging started?

'LINK-3-UPDOWN' is a standard message tag in the style that Cisco put on (almost) all their log messages - Google is your friend.

If you don't know what 'up' and 'down' mean with regard to a switch interface then you probably need more training than we can offer you here.


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