[mrtg] Re: clearing of counters on Cisco

[Lindahl, Carl]

What version (possibly versions) of code are you running on your various
Cisco devices? 

Are you using SNMP v1 or v2 to poll the devices?  If you are using v1, and
the counters are exceeding the 32 bit max, if the IOS or CatOS supports it,
you can goto SNMP V2 to give you 64 bit counters (any one feel free to
correct me if I'm wrong about this) to give you a better view of the
interface.


Carl

-----Original Message-----
From: Scott P. Daffron [mailto:scott at cs.odu.edu]
Sent: Friday, January 24, 2003 11:26 AM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] clearing of counters on Cisco



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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