Syslog and facilities

"saudi sans" <[email protected]>
Newsgroups gmane.comp.sysutils.loganalysis
Message-ID <[email protected]> 
Syslog has facilities and levels.

What is the "facility" in syslog ? The level concept is pretty intuitive.

As I understand "facility" field contains the source-program which
generated the log entry .

I have a central syslog server where I am aggregating logs from
several cisco routers and Unix machines.

I have given Level7 as my facility in all cisco routers and Level4 for all Unix

If I am collecting logs remotely does the "facility" field contain
anything meaningful? Does it make any difference to the log generation
? Does it matter if I set Level4 or LevelX?
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