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

Richard Cotrina rcc at speedy.net.pe
Mon Dec 17 18:37:12 MET 2001

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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