[mrtg] Re: clearing of counters on Cisco

bwoodcoc bwoodcoc at genuity.com
Fri Jan 24 18:56:15 MET 2003


What version of mrtg are you running? I had an issue with failed polls 
spikes. I also suspected that a counter roll-over could have produced a similar
result (but did not confirm). I have upgraded and the problem has been 
We are currently at 2.9.22 . Although not the same exact scenario, it may have
relevance in your case also.

At 11:25 AM 1/24/2003 -0500, Scott P. Daffron wrote:

>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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