[mrtg] Re: Monitoring VLANs on CISCO

[Will Saxon]

It is, but my experience is that vlan-wide information is stored on the RSM (if you have those). So, if you want to see all of vlan 1 you get that from the RSM. If you want to know the amount of traffic on vlan 1 for your particular switch, you are going to have to build a custom mrtg cfg file that includes an aggregate definition for all the ports you know are on vlan 1 on the switch. Obviously this is not dynamic, but it is all I have been able to come up with.

Whenever I have tried monitoring vlan information on the switch itself, the interface gets commented out by cfgmaker because the switch reports an interface speed of 0, and no traffic information is stored in if{In|Out}Octets. The majority of our traffic is routed via RSMs still, so I have not had a huge problem monitoring total vlan traffic. 

We do have a newer 6513 device with a Sup2/MSFC2 blade in it. We are running in hybrid mode and doing layer-3 switching on the switch side; the MSFC2 seems to only come into the picture with multicast and logged access-list traffic - everything else is handled via the SUP2, and thus we are just out of luck with respect to vlan monitoring on that device.

-Will

-----Original Message-----
From: David Roze [mailto:droze at digiweb.ie]
Sent: Friday, March 14, 2003 9:20 AM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] Monitoring VLANs on CISCO


Hi,

Has anybody ever tried to monitor trafic on VLANs on a cisco switch?
I manage to do it for the whole interface but I'd like to do it for each 
different port.
I can't find actually the right OID for these.
My switch is a Catalyst 2950.

Does anybody know if it's possible?

Thanks

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