Cisco 2960 QoS for VoIP DSCP 40

Unanswered Question
Mar 3rd, 2008

I am trying to put together a config for a 2960 switch (running 12.2(25)SEE3 C2960-LANBASE-M) that will give priority to voice packets which are already marked with DSCP 40 by the VoIP phone systems. I have successfully used Cisco 2950 switches to do this in the past so I want to ensure that my 2960 will do the same job.


There is a 3662 router connected to Fast0/1 that connects off to a number of other sites that run the same model VoIP PBX. The local VoIP PBX connects to Fast0/2. Gig0/2 links down to a Cisco 2950 that has a VoIP analogue phone module.


I have posted the relevant parts of my config file below:-



hostname switch16

!

!

!

mls qos

!

!

!

interface FastEthernet0/1

description To Cisco 3662

switchport mode trunk

srr-queue bandwidth share 30 20 25 25

priority-queue out

mls qos trust dscp

!

interface FastEthernet0/2

description To VoIP phone system

switchport mode trunk

srr-queue bandwidth share 30 20 25 25

priority-queue out

mls qos trust dscp

!

interface FastEthernet0/3

spanning-tree portfast

!

interface FastEthernet0/24

spanning-tree portfast

!

!

interface GigabitEthernet0/2

description To Parts Cisco 2950

switchport mode trunk

srr-queue bandwidth share 30 20 25 25

priority-queue out

mls qos trust dscp


end


Am I doing the right thing by using the priority queue command?


Should I be doing anything to the ingress queues as well?


Any thought / suggestions are gratefully received.

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