[cisco-voip] QoS on Catalyst 3550

[Mike King]

I've used the Nortel phones.  They do DSCP tagging.

Mike

On Thu, Feb 3, 2011 at 3:58 PM, Norton, Mike <mikenorton at pwsd76.ab.ca>wrote:

> Michael -
>
> "We can't count on the handset marking its traffic as DSCP 46 (or CoS 5) as
> we're using a mash-up of Cisco IP phones, Nortel phones, etc."
>
> Have you actually verified that, or are you just assuming it? Even the
> crappy $90 Grandstream SIP phone I play with Asterisk with at home will tag
> its packets. You are better off properly configuring your phones to mark
> their packets than over-complicating things at the switch. As another poster
> mentioned, re-marking ALL traffic from a particular subnet as DSCP EF is not
> particularly wise because not all traffic will be worthy of priority. For
> example, if your phones all fetch a new firmware image over TFTP you do not
> want all that going through priority queue. Only RTP stream should be EF.
>
> --
> Mike Norton
> I.T. Support
> Peace Wapiti School Division No. 76
> Helpdesk: 780-831-3080
> Direct: 780-831-3076
>
>
>
> -----Original Message-----
> From: cisco-voip-bounces at puck.nether.net [mailto:
> cisco-voip-bounces at puck.nether.net] On Behalf Of Michael Crilly
> Sent: Wednesday, February 02, 2011 10:14 AM
> To: cisco-voip at puck.nether.net; cisco-nsp at puck.nether.net
> Subject: [cisco-voip] QoS on Catalyst 3550
>
> Greetings,
>
> I am attempting to configure QoS on a series of 3550s, a 3560 and our core
> switch, a 4500. Currently, I am testing QoS configurations on the 3550, but
> with limited success.
>
> Using auto qos would be nice, but we can't count on the handset marking its
> traffic as DSCP 46 (or CoS 5) as we're using a mash-up of Cisco IP phones,
> Nortel phones, etc. Therefore, we want to match traffic on our VoIP IP
> network, which is currently configured to run on 10.200.0.0/16.
>
> The issue I am having is nothing is being matched when I look at the output
> of 'show policy-map interface fa0/3' (fa0/3, for example), but I can see
> packets being classified as DSCP 46 when I look at the 'mls qos interface
> fa0/3 stats' command.
>
> I have attached my switch's configuration (with passwords censored).
> Could someone take a quick peak and let me know if they can see anything
> that is missing? It could be something obvious that my now stale eyes are
> missing, so a fresh pair might help.
>
> Thanks in advance for all assistance/responses.
>
> Kind regards,
>
> --
>
> Michael Crilly
> ICT Systems Administrator
> Comtek Network Systems
>
> E: michael.crilly at comtek.co.uk
>
>
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