[mrtg] Re: Vlans

Bill Wichers billw at waveform.net
Wed Nov 2 00:47:24 MET 2005

>> Is it worth it to graph Vlans?
> not for layer 2.  Those are all wirespeed fabrics, so you don't have a
> constrained resource that graphing would allow you to predict anything
> useful.
> for layer 3 it is marginally interesting when planning uplinks.

If you're trunking L2 VLANs between switches then graphing the uplinks may
well provide useful information, especially if you're oversubscribing the
interface. Graphing individual ports may or may not be useful, depending
on the application. I wouldn't personally graph switch ports feeding
individual workstations, for example (unless I expected trouble), but
graphing servers or paying customers would be useful.

L3 isn't the only place where graphs can provide useful information.


Waveform Technology
Systems Engineer

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