[mrtg] Re: Need to monitor VLAN traffic

[Erik Denny]

All-

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

On Wed, 3 Sep 2003, Cook, Garry wrote:

> Thanks for the help Woody.
> So it looks like I'll have to monitor the switch ports individually,
> instead of the VLANs. Most of the customers are on single ports,
> although a few use FEC across 2 ports. I can aggregate that traffic by
> hand if necessary.
> 
> Does anyone have a template handy that will pull VLAN information from
> the ports and/or recognize FEC and aggregate the traffic?
> Or possibly other suggestions?
> 
> Garry W. Cook, CCNA
> Network Infrastructure Manager
> MACTEC, Inc. - http://www.mactec.com/
> 303.308.6228 (Office) - 720.220.1862 (Mobile) 
> 
> > I believe you are correct in your assumptions. You will only 
> > see the first connection setup packets and then the rest may 
> > be switched and not counted from the vlan perspective. We 
> > have seen the same thing here and came to the same conclusion.
> > 
> > You will need to aggregate, on a per customer basis, to get 
> > want you want using the physical interface metrics. This 
> > probably depends on your provisioning technique. We never 
> > went to the full extent of resolving this ourselves. Good luck.
> > 
> > Cheers,
> > Woody...
> > 
> 
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