[mrtg] Re: Issue above 120Mbps

Greg.Volk at edwardjones.com Greg.Volk at edwardjones.com
Thu Jul 21 22:00:13 MEST 2005

>             Has anyone seen a problem where if an interface is doing
> above 120Mbps it suddenly spikes down to 0 in a graph? I'm seeing this
> on my Cisco 12000 GSR on a oc-3 card.. Anyone have any hints?

You have reached the 32 bit counter limit for a five minute poll - the
port is passing more than 2^32 bytes in less than 300 seconds. You need
to be polling this device via the 64 bit counters. Use something like...

cfgmaker --snmp-options=:::::2 community at router 

...to building a 64 bit counter config.

The actual limit for a 32 bit counter is closer to 114.6 megabits/sec.

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