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

[Alex Balashov]

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.

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/release/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
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