[cisco-voip] QoS on Catalyst 3550

Nick Matthews matthnick at gmail.com
Wed Feb 2 23:23:23 EST 2011

If I remember correctly the DSCP value will be determined inbound.  I'm not
sure if trusting DSCP outbound is the correct way to do this.  I would think
it would be switched - trust dscp inbound, set dscp outbound.  Then again,
not a 6500 guru.


On Wed, Feb 2, 2011 at 12:14 PM, Michael Crilly <michael.crilly at comtek.co.uk
> wrote:

> 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
> 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
> _______________________________________________
> cisco-voip mailing list
> cisco-voip at puck.nether.net
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