[mrtg] Aggregate values won’t work if sum greater than 115 Mbits

Steve Shipway s.shipway at auckland.ac.nz
Thu Aug 21 02:14:02 CEST 2008

Three options.

1) Use SNMPv2 on both polls, so you get 64bit polling.  Make sure you have a later version of MRTG.  If one of the components is 32bit then you will get counter wrap at 32bit, IE about 115Mbps.
2) Set up two separate targets, one for each interface, then use Routers2 as a frontend and make a userdefined summary graph over the pair with a total line.
3) Change to polling every 1min and change your Interval: setting to be 1 minute, and recreate your .rrd files.  Then you can cope with up to 575Mbps.


From: mrtg-bounces at lists.oetiker.ch [mrtg-bounces at lists.oetiker.ch] On Behalf Of fem-test at freenet.de [fem-test at freenet.de]
Sent: Wednesday, 20 August 2008 9:20 p.m.
To: mrtg at lists.oetiker.ch
Subject: [mrtg] Aggregate values won’t work if sum greater than 115 Mbits


I would like to aggregate two values of outgoing traffic like

Target[myrouter]: 2:public at wellfleetA + 1:public at wellfleetA

This work fine till the sum of both values greater than 115 Mbits. If the sum greater than 115 Mbits the result is like Sum -115

How can I fix the wrong aggregation? Any ideas?


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