[mrtg] A target arithmetic issue

[Adam Bayless]

I have three OC3 connections on Cisco 7500 series routers that I am graphing using 
MRTG 2.14.3. The individual graphs for the interfaces look correct:

http://www.fiber.net/mrtg/oc3-1-day.png
http://www.fiber.net/mrtg/oc3-2-day.png
http://www.fiber.net/mrtg/oc3-3-day.png


But when I try to combine them all into one graph using this config:



Target[oc3-total]: \POS3/0/0:community at router +
                 \POS8/0/0:community at router +
                 \POS8/0/0:community at router
MaxBytes[oc3-total]: 27426816
AbsMax[oc3-total]: 60948480
Options[oc3-total]: bits
ThreshMaxO[oc3-total]: 27426816
ThreshProgO[oc3-total]: /mrtg/bin/threshold-programs/routerTrafficAlert.pl
ThreshMaxI[oc3-total]: 27426816
ThreshProgI[oc3-total]: /mrtg/bin/threshold-programs/routerTrafficAlert.pl
SetEnv[oc3-total]: LINKNAME="Total OC3 Traffic"
Title[oc3-total]: Total OC3 - Traffic
PageTop[oc3-total]: <H1>Total OC3 - Traffic</H1>
  <BR>



I get a strange looking graph:

http://www.fiber.net/mrtg/oc3-total-day.png

This has persisted over several upgrades to mrtg, so I'm guessing I must be 
configuring something wrong but I can't figure out what it is.  All the individual 
graphs are created in the same run of MRTG as the combined graph, so if MRTG is 
really caching snmp results the way it should then the values should be identical and 
there must be something wrong in the way it is adding them up. Any ideas?

-adam




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