[c-nsp] VoIP classifying and queuing in an access switch <--> core Layer 2 network

[Alex Balashov]

Oliver Boehmer (oboehmer) wrote:

> Alex Balashov <> wrote on Friday, September 05, 2008 8:28 AM:
> 
>> If the switch is purely Layer 2, it would be difficult to classify
>> VoIP traffic ipso facto, as the factors that differentiate it from
>> other kinds of traffic are, by definition, >= Layer 3.
> 
> Well, even a Layer 2 switch can classify based on L3 information, most
> of today's (and yesterday's) Cat2xxx/3xxx support this. 
> I would recommend looking at the Enterprise QoS solution reference at
> www.cisco.com/go/srnd for plenty of examples for various access switch
> platforms.

Really... I wasn't aware Layer 2 devices had DiffServ/DSCP awareness.

I stand corrected, then!



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Alex Balashov
Evariste Systems
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