[mrtg] Strange spikes with summer (router0 + router1) traffic

Bill Wichers billw at waveform.net
Mon May 21 18:36:51 MEST 2001

I'm seeing these strange spikes in some summed graphs (two routers added 
together with the + in the config). The usual traffic is in the several 
hundred k range on each router, but occasionally there will be huge spikes 
to 48 Mb and other very high numbers even though the graphs of the two 
routers seperatly do not show this much traffic when added together by 
hand. I have another summed graph of a router port and an SNMPd port on a 
UNIX box that behaves in a similar way, but the spikes do not line up 
time-wise between the router+router and router+server graphs.

Most of the time the graphs show the correct traffic amounts, but it looks 
like occasionally there will be a single sample to many megabits and then 
it goes back to normal. This is on MRTG 2.9.10 running on a Redhat Linux 
7.0 box (with some of their patches installed). Does anyone have any idea 
what might be causing these spikes and any suggestions for a possible fix?


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