[mrtg] Aggregate Graphing

Brian E. Seppanen seppy at chartermi.net
Fri Dec 14 13:38:20 MET 2001


I'm trying to create a graph of aggregate bandwidth that is comprised of 5 
DS3's.   During peak times, when the totals are going above 100MB, the 
totals on the graphs inch up and then bottom out to about 50MB (As if some 
of the interfaces are no longer reporting SNMP values).   They are still 
showing traffic, but it drops to about 50MB, periodically it will spike 
back up to 100MB, and then the next poll will drop it back to 50MB.   
Some of the spikes are over the 100MB threshold so I wouldn't think that this 
would be due to a max bytes setting.   This continues until eventually it 
reaches the 100MB thresh hold and then the graph stabilizes again.   Each 
of the individual graphs indicates that they are just fine, on the routers 
themselves.   I have tried tweaking the number of retries, backoffs and 
timeouts, although I'm back to default values in most cases.

An example of what my config looks like, with IP's and community's changed 
to protect the innocent.  

Target[total]: 1:community at + 2:community at + 3:community at + 4:community at + 5:community at
MaxBytes[total]: 33157500 



Brian Seppanen
seppy at chartermi.net
906-228-4226 ext 23

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