[mrtg] Weird Cisco issue

[Keith]

I've been using MRTG for awhile, and have never come across this strange
occurance. I'm hoping someone else can shed some light on this for me. I
am using MRTG 2.7.5 under Solaris 2.6.

I'm monitoring about 300 interfaces via MRTG in two different
configuration files (roughly 50/50, 150 interfaces in each config file.) 
In one of the configuration files I am attempting to add 7 Cisco
Interfaces together. They just happen to be my upstream connections. It
looks something like:

Target[all.transit]: 4:comm at router + 5:comm at router + 4:comm at router2 + 5:comm at router2 + 21:comm at router3 + 22:comm at router3 + 23:comm at router3
MaxBytes[all.transit]: 50576000
Options[all.transit]: bits
Title[all.transit]: All Upstream Connectivity
PageTop[all.transit]: <H1>All Upstream Connectivity
 <BR></H1>
 <TABLE>
   <TR><TD>System:</TD><TD>routers</TD></TR>
   <TR><TD>Maintainer:</TD><TD>me</TD></TR>
   <TR><TD>Interface:</TD><TD></TD></TR>
   <TR><TD>IP:</TD><TD></TD></TR>
   <TR><TD>Max Speed:</TD>
       <TD>"A lot" :)</TD></TR>
  </TABLE>

The produced data and graph are extremely inconsistant (it's not "wavey"
like it should be) and does not corrilate to the graphs of each individual
interface. (The above might produce 30mb, when all of the other graphs
total 100mb, for instance.)

Am I doing anything wrong, is it an IOS bug (these are 7206VXRes) as I
have been told, an MRTG bug, or is it just bad luck?

Thanks,

--
Keith McCallion
keith at mccallion.com

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