[mrtg] Re: Need to monitor VLAN traffic

Cook, Garry GWCOOK at mactec.com
Thu Sep 4 00:01:44 MEST 2003

Yes, I'm successfully monitoring VLANs on the 7200 routers. In fact,
this is how I realized there was a problem, as the VLAN graphs on the
7200s and the 6500s did not match up.
Also, I do have router blades in the switches, this is where I'm running
into the issue. The MSFCs in the 6500 series routers do not report all
VLAN traffic, only the setup packets.

Garry W. Cook, CCNA
Network Infrastructure Manager
MACTEC, Inc. - http://www.mactec.com/
303.308.6228 (Office) - 720.220.1862 (Mobile) 

> It might be difficult to find, but I know that under the 
> newer IOS's for 
> the 7200 class, it IS possible to monitor a vlan's traffic.  I'm 
> successfully doing it currently on 4 routers.
> However, it's apparent that it's not supported on Cisco 
> switches themselves (unless Garry is lucky enough to have a 
> router blade in the 6500?).  I've also got soem Dell 
> switches, can't do it there either (and 
> BTW- I can't get bi-directional data out of my Dells, only 1 
> direction at 
> a time...)
> So, there is hope on the horizon, but it's slow in coming.  
> But monitoring 
> BVI's isn't working right though :(
> ..erik

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