[mrtg] Spike after an outage.

Arun Kumar arun.kumar at estelcom.com
Mon Jan 19 01:51:53 MET 2004

Hi friends!
The MRTG for  my router traffic shows high spikes, but in fact there is no such traffic flow really.

This happens mostly when my MRTG server loses connectivity to the router. And when the connectivity is restored, it shows a high spike. 

I had gone through the mailing list, but there was no solution present. Different people explain in a different way. People say it is a normal operation, as the software tries to calculate the traffic during the outage period and hence a spike is displayed. Some say about 32 bit / 64 bit counters overflow. If anyone can explain me clearly, it will be really helpful for me. Or else is this a problem with the  MRTG version? I am using mrtg-2.9.17-1. 

I am using MRTG to monitor the router's CPU. If there is a spike due to the software's miscalculation, then it is a problem for me. ( say the graph states 95% utilization, and I get confused whether the router has really reached, or the software has interpreted values during the outage period ).

Please share your views in this regard..

Arun Kumar

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