From: amilabs (amilabs@optonline.net)
Date: Wed Dec 01 2004 - 01:32:14 GMT-3
There are specific command, I have used them on the 3550 for some qos of
voice traffic and the qos does work. I don't have them at this moment but I
learned them from the following book. Cisco Catalyst Qos: Check cisco press.
This book goes into the details of qos on the 3550 and the 6500(native and
hybrid) plus the 4000, 2800 and old 5000 series switches. It is worth a look
at your book store or pickup for your testing.
The problem may be trusting. You need to set the ingress switch to trust the
qos setting(qos set from the phone) or to set the voip packet at the ingress
switch port and trust from that point forward.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Church, Chuck
Sent: Tuesday, November 30, 2004 11:13 PM
To: Group Study
Subject: Slightly OT: QOS on 6500 and 3550
Anyone,
I'm working in a lab environment where we're using an Ixia traffic generator
to load up some LAN segments alongside some Avaya IP telephony traffic.
Supposedly the phones are using dot1P tags of COS 6, and IP DSCP 46 on the
layer 3 side. I'm seeing drops during the tests of these packets. My QOS
settings aren't seeming to help much, so I'm questioning the tagging at
layer 2 and 3 of the phones themselves. My question is; is there anyway to
gather stats on what DSCP and dot1P tags the ports are seeing in both CatOS
for the 6500 and IOS for the 3550? I've looked through the various show qos
and mls commands, but don't see anything that'll tell me if any dot1p-tagged
frames are being received.
Thanks in advance,
Chuck Church
Lead Design Engineer
CCIE #8776, MCNE, MCSE
Netco Government Services - Design & Implementation Team 1210 N. Parker Rd.
Greenville, SC 29609
Home office: 864-335-9473
Cell: 703-819-3495
cchurch@netcogov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x4371A48D
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