Is it possible to graph (MRTG or similar) all traffic passing in and out of a VLAN. I have tried graphing the VLAN interface on a MLS that acts as the default gateway for that VLAN (ifdescr = Vlan180 for example), however, the traffic I see is a couple of hundred bytes per second - which is far too low. Am I missing something?
Apologies for post in the LAN section too - I couldn't work out how to move my post.
The counters for the VLAN interface will only reflect the traffic destined for the switch. In order to get the actual transit traffic on a 3750 you would need to either SPAN the VLAN traffic to a monitor port, or sum the counters from the ports which are a member of that VLAN.