[mrtg] Re: Tagged VLAN and MRTG

Smiraglia, Pablo PSmiraglia at OptiGlobe.com.ar
Thu Dec 6 15:40:19 MET 2001

Hash: SHA1

> Hi,
> Anyone has an experience with tagged VLAN and MRTG ?
> 1) L2 Switch using tagged VLAN
> Suppose a L2 switch uses multiple tagged VLAN on a single
> physical port and I'd like to run MRTG per tagged VLAN to
> monitor each VLAN traffic.
> Can we do this ?
No per-vlan counters on Cisco.
> If you are doing this, what kind of switch are you using ?
> Cisco, Foundry or Extreme ?
> If the above approach is not feasible, maybe I can run
> MTRG to the router instead of switch. So my next
> question is...
> 2) Cisco Router using sub-interface (tagged VLAN)
> Suppose a Cisco box uses multiple sub-interfaces on a single
> physical interface and I'd like to run MRTG per sub-interface
> (or per tagged VLAN) to monitor each VLAN traffic.
> Can we do this ?
Does not work on Cisco routers (no per-ethernet_subinterface counters), at
least with 12.1 (x) on C7500. On the MSFC of a Cat switch, it works but, as
it only gets the first packet of the flow (the rest is switched) won't be
useful for you.
> Your input on this matter is truly appreciated.
Hope this helps,

- ------------------------------------------
Pablo Marcelo Smiraglia 
Network Manager 
Optiglobe Argentina
- ------------------------------------------ 


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