[mrtg] clearing of counters on Cisco

Scott P. Daffron scott at cs.odu.edu
Fri Jan 24 17:25:47 MET 2003

Oh most wise MRTG gurus,

We have noticed that our version of MRTG (a couple years old) shows a huge
spike on our Cisco interface graphs whenever a "clear counters" is done on
the device.  This is becoming a big problem for us, as we have just
implemented a new NMS which clears all counters once per day.

I know this is an issue of the OID counter wrapping, leading MRTG to think
that a massive bandwidth spike has indeed occurred, but is there a way to
configure MRTG not to draw this conclusion (and alleviate all of the
massive spikes in our graphs)?  Does a newer version of MRTG handle this
differently?  I have looked high and low, but can't seem to find an answer
on this.  Thanks in advance...

Scott Daffron
Network Engineer
Sentara Health Care

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