From: Kelly, Russell G (Russell_Kelly@eu1.bp.com)
Date: Thu Aug 26 2004 - 03:50:25 GMT-3
Cisco phones automatically mark at cos 5.
Your access port config is fine (however make sure you use the trust
extended too). Cisco phones automatically mark at cos 5 (as above),
which is put in any priority quese automatically. You nee to define the
wrr and cos markings on the access (edge of the network), then trust on
the rest of the L2 L3 links.
You need to configure the all switches/routers with with the global
settings:
mls qos
mls qos map cos-dscp 0 8 24 34 46 48 56 0
mls qos map ip-prec-dscp 0 8 16 24 34 46 48 56
On some access switches you have the option to configure 'mls qos trust
device cisco-phone'. In this case an example of an access port config
(with wrr configured too) is:
Int fax/x
switchport access vlan x
switchport mode dynamic desirable
switchport voice vlan y
mls qos trust device cisco-phone
mls qos trust cos
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 3
wrr-queue cos-map 3 4
wrr-queue cos-map 4 5 6 7
mls qos trust extend cos 0 (ensures any daisy-chained device is set to
cos 0)
priority-queue out
On other access switches the cisco-phone command is not present. In
this case configure an access port as (again with wrr configured and
this is an example for a ws-x6548 line card...the wrr options change in
models!!):
Int fax/x
wrr-queue bandwidth 5 25 70
wrr-queue random-detect 1
wrr-queue random-detect 2
wrr-queue random-detect 3
wrr-queue random-detect min-threshold 1 1
wrr-queue random-detect max-threshold 1 100
wrr-queue random-detect min-threshold 2 1
wrr-queue random-detect max-threshold 2 100
wrr-queue random-detect min-threshold 3 80
wrr-queue random-detect max-threshold 3 100
wrr-queue cos-map 1 1 1
wrr-queue cos-map 2 1 0
wrr-queue cos-map 3 1 2 3 4 6 7
priority-queue cos-map 1 5
no snmp trap link-status
mls qos trust cos
mls qos trust extend cos 0
switchport
cdp enable
switchport mode dynamic desirable
switchport access vlan x
switchport voice vlan y
storm-control broadcast level 20.00
On L2 Trunks
============
mls qos trust cos
Mls qos vlan-based
On L3 Links (dscp) (this is required on the 4507 ....along with the
global qos settings)
=================
Int fax/x
wrr-queue bandwidth 5 25 70
wrr-queue random-detect min-threshold 1 1
wrr-queue random-detect min-threshold 2 1
wrr-queue random-detect min-threshold 3 80
wrr-queue cos-map 1 1 1
wrr-queue cos-map 2 1 0
wrr-queue cos-map 3 1 2 3 4 6 7
mls qos trust dscp
Remember global settings and wrr..
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Richard Anderson
Sent: 26 August 2004 06:45
To: ccielab@groupstudy.com
Subject: QOS Problem
What is the recommended QOS settings for Cisco IP Phones.
If all of the IP Phones belong to one VLAN then one simply enable
mls qos
mls qos trust cos on all interfaces, but what the approach should be if
there is a layer III switch such as 4507 which is doing intervlan
routing for multiple Voice VLANS.
I have a 4507 switch which is configured for 3 voice vlans and also
doing routing for these three voice vlans. Each floor has 3750 switch
uplinked to 4507 switch. I am having an issue with voice quality as
well as Phone A can hear Phone B, but Phone B can't hear Phone A
On 3750, I have configured
mls qos
interface x
mls qos trust cos.
What should be on 4507 switch.
Urgent help needed.
Thanks,
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