[mrtg-developers] MRTG graph behaviour

nisha nisha.sasindran at gmail.com
Thu Sep 24 07:46:22 CEST 2009

Hi All,

I am using MRTG application and need inputs on the MRTG graph behaviour.

The router config file has certain OID’s which on polling may or may not
return a result. Now in case there is no result, I am manually setting the
value to 0 in the rrd file. This causes spikes of very high value in the
graph when the traffic is stopped. 

To avoid this I removed those lines of code where I was manually setting the
value to 0 so that "NaN" gets written in the rrd files. This resulted in
hanging graphs (graph values starting from middle instead of starting from

I also tried setting the option “unknaszero” in the router config file. This
option was plotting the correct continuous graphs but the graph legend/label
was still showing the value 0.

Can anyone suggest a solution for this if you have come across this kind of

Thanks in advance,

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