[mrtg] Re: MRTG Graphs - True CIR representation

Steve Shipway s.shipway at auckland.ac.nz
Thu Feb 2 21:15:24 MET 2006

 > is:  I am monitoring T1, Frame-Relay, CPU and Ethernet 
> traffic.  The graphs only grow to the maximum bandwidth being 
> used.  The grow to the size of the spikes, they are not a 
> true representation of the actual "pipe" ie.  A T1 would be 
> 1.544 mbps or a 512 frame relay.  I'd like the graphs to "always"
> stay at here true commited rate and have the actual data benn 
> represented within the graph.

If I understand you correctly, you'd like the graphs to show the true amount
of data and not be capped at the max bandwidth.  

At my previous employer, we had Frame relays which were 64k within a 512k
pipe.  Our provider would often let us exceed the 64k, but the 512k pipe
could not be exceeded, of course.

So, I set MaxBytes to the 64k, and AbsMax to the 512k.  This allows the
graph to exceed 64k, but MRTG realises any values over 512k are obviously
false.  The graph should automatically stretch on the y-axis when required
to show these larger values.


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