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

[Oliver Boehmer (oboehmer)]

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.

	oli

 
> About the only thing you can do there is use segregated VLANs, and/or
> take advantage of the native "voice VLAN" feature of certain
> Catalysts: 
> 
>
http://www.cisco.com/en/US/docs/switches/lan/catalyst2940/software/relea
se/12.1_19_ea1/configuration/guide/swvoip.html
> 
> Grant Moerschel wrote:
> 
>> In an access switch to core where the connections are Layer 2, what
>> is the best method to a) classify voip traffic as it enters the
>> access switch and b) prioritize it via some queuing mechanism as it
>> traverses the trunk going to the core? Does anyone have sample
>> configs for something like this? 
>> 
>> Pc <-> phone <-> access switch <-> core switch. Priority to VoIP
>> traffic on trunks.
> 
> --
> Alex Balashov
> Evariste Systems
> Web    : http://www.evaristesys.com/
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