[mrtg] MRTG graphs not showing proper values

Steve Shipway s.shipway at auckland.ac.nz
Wed Nov 3 21:41:32 CET 2010

>      I am using MRTG graphs to peg the utilization of my router ports.
> Everything is fine till the utilization is somewhere near
> 114Mbps/106Mbps in

This is the counter rollover.  You are using 16bit counters and at this speed, they roll over within the 5min polling interval.  You need to use the HC counters in SNMPv2 or decrease your polling interval.

To use HC counters and SNMPv2, put ':::::2' after the Target definition -- eg

1:community at host:::::2

This is a standard FAQ problem, except that we don’t have an FAQ (Tobi?  Want to add one to the MRTG website?)


Steve Shipway
ITS Unix Services Design Lead
University of Auckland, New Zealand
Floor 1, 58 Symonds Street, Auckland
Phone: +64 (0)9 3737599 ext 86487
DDI: +64 (0)9 924 6487
Mobile: +64 (0)21 753 189
Email: s.shipway at auckland.ac.nz
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