[mrtg] Re: Weird Cisco issue

[tozz at sidehack.sat.gweep.net]

I solved this by moving my 'Total BW' graphs over to RRDTool.  It is
not an IOS bug.  RRDTool and MRTG deal with the rolling 32 bit counter
problem differently and I think this may be the cause of the
inconsistent graphing of high amounts of traffic on MRTG.

-cp

> 
> 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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> 

--
Craig Pierantozzi			voice: 720-888-1226
IP Engineering				pager: 888-463-3651
Level 3 Communications, Inc.		email: tozz at level3.net

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