[mrtg] Re: Wrong values in ATM PVC monitoring for Cisco Router

[Joe Strause]

Richard,

I have to same issue here. I am using a Shasta BSN 5000 and my usage is
always higher on my end than it is on the Cisco end.
The difference I have is that between the Shasta and the Cisco 7507, (I know
your using 7204) I have an ASX 200 Marconi that
I am also graphing. It always shows the same values as the Shasta ports but
its always 2 megs less at the Cisco end. The only
explanation I could ever come up with is that the Shasta pumps out a lot of
"management" traffic that the Cisco drops before it
records he SNMP values.
I don't know if this helpful at all, but I'd curious to see what you find
out.

Thanks,
Joe Strause

-----Original Message-----
From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]On
Behalf Of Richard Cotrina
Sent: Monday, December 17, 2001 12:37 PM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] Wrong values in ATM PVC monitoring for Cisco Router


Hi all :

I am monitoring ATM sub-interfaces in my Cisco 7204 router, IOS 12.1(5)T1. I
got the cfg file from cfgmaker and it seems to be monitoring aal5 intercafe
layer (PVC) according the line I got in the SetEnv variable :

SetEnv[a.b.c.d]: MRTG_INT_DESCR="ATM1/0.3-aal5 layer"

It looked to be fine and I am having the traffic graphics in that PVC.

However, my client has started his monitoring in the equipment that is
connected to the PVC where I am getting the graphs. He is using MRTG too ,
the same version than me ( 2.9.17 ) and the only difference between us is
the type of equipment ( he is using a Nortel Router ), and we got different
values of Current in/Out bits per second in the traffic values.

The matter is that sometimes the difference is big enough ( ~ 2Mbps ) and we
doubt if the values we are getting are correct. Always the values I got in
the Cisco Router is lower than my client is getting in his Norftel Router
( Shasta BSN 5000 ). Of course I've considered that the output traffic in my
Router is the input traffic in my client's router and viceversa.

I think the problem could be in the Cisco SNMP response. I've taken a look
at the documentation and I could not find anything related to this problem
in the Cisco Router.

Any ideas about this problem ?


Thanks in advance


Richard Cotrina



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