Intepreting Cisco Switch and Router Logs - please help

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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 ?

And

18312: 5w4d: %LINK-3-UPDOWN: Interface FastEthernet0/12, changed state to d
own
Many thanks in advance.

Re: Intepreting Cisco Switch and Router Logs - please help
 daniel.kamunge@gmail.com wrote:

Quoted text here. Click to load it

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.

Sam

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