[mrtg] How to measure VLAN Traffic with MRTG ?

[nobody]

Hi all,

we have a lot of different Cisco Switches and we want now to display the 
Traffic of some VLANs (at a Webpage). I would like to get the Traffic 
with SNMP (using Mrtg).

For Example:
Lets say we have a Switch with 24 Ports. 12 Ports are used with VLAN 100 
and the other 12 Ports are used with VLAN 200.

The Problem:
Sure i can Mrtg say: "Take the physical Ports 1,2,3,4,5...12 ,build a 
sum and display it as VLAN 100". But if the configuration of the Switch 
changes i have always to modify the mrtg Config too.

My Question:
Does a Switch store some VLAN Information like Traffic/Bandwidth etc in 
a special part of the MIB? If so, i could directly read out these values 
and display it without having problems when the configuration of the 
Switch changes.

(I know that the Cisco Switches produces an "interface - entry" for 
every VLAN, but i did not find something about the Traffic)


Thanks a lot


-Tom-

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