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

Sawyer, David david.sawyer at uk.mckhboc.com
Tue Dec 18 15:41:57 MET 2001

Do your links have compression, if so the non-Cisco device may count
compressed data, but the Cisco device may count un-compressed data.

It's just a thought...

-----Original Message-----
From: Joe Strause [mailto:strause at ceni.com]
Sent: 18 December 2001 13:42
To: Richard Cotrina
Cc: mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: Wrong values in ATM PVC monitoring for Cisco Router


# -- snip

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

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 :

# -- snip

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.

# -- snip

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