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How does the 2960/3960 handle SRR Share and Shape when Priority Queue Out Command is enabled

Posted on 2010-08-19
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Last Modified: 2012-06-21
I would like to run the priority queue out command on interfaces carying voip traffic, enabling the strict priority queue.  However, it is my understanding that when you enable this command the shape and share commands (I am mostly concerned w/ the shape command) esentically become irrelevant.  So traffic marked and subsiquently mapped to Q1 (priority queue) could starve the other traffic.  Can someone please confirm my interpreatations and if I am correct, what is the appropriate method to configure a strict policing for a certain amount of bandwidth on that queue.
Thanks.
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Question by:jtmoske
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Alex Bahar earned 500 total points
ID: 33511531
After you enable "priority-queue out" on the outbound direction, you need to configure policy maps to classify voice traffic and use police command to limit the amount of voice class traffic.

http://www9.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.1_19_ea1/configuration/guide/swqos.html#wp1024977

policy-map MYPOLICY
class MYVOICE
trust dscp
police 200000 20000 exceed-action drop


Alternatively you can use aggregate policer on your ingress voice VLAN ports to limit the total amount of voice traffic entering the switch from voice devices.

http://www9.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.1_19_ea1/configuration/guide/swqos.html#wp1048656
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