[mrtg] graphing network collisions

[Alex van den Bogaerdt]

Woke up this morning and there were two separate questions on graphing
collisions...  I think I better work from home today :)

People would like to know how to graph collisions on their cisco device.
This shouldn't be hard to do if you keep in mind an important thing
about MRTG:  it can only store and graph integers.

What happens if there is one collision in 5 minutes?  For the normal
MRTG configuration this would mean that it should store (1/300) per
second and this is truncated to zero.  Whoops, you loose, the one
collision you have is gone.

If there are many collisions per second, it can be graphed.  I don't
know when things start to go wrong but IMHO collisions shouldn't
happen too much and I'm not used to see them as I'm using switches.

If I would graph collisions, I'd probably use GAUGE for them; or I'd
go with RRDtool and graph exactly that (1/300).

Other options are: multiply with a number (for instance, 300) or use
one of the "perhour/perminute" options.

regards,
-- 
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