Unanswered Question
May 7th, 2008

Dear Friends. Can some body explain what is the each command will do. pls explain.

class-map match-any Voice

match dscp ef

match ip precedence 5

class-map match-any Signaling

match dscp cs3

match ip precedence 3



policy-map QoS-WAN-01

class Voice

priority 460

class Signaling

bandwidth 246

class class-default




I have this problem too.
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dezoconnor Thu, 05/08/2008 - 01:04

Using the Modular QoS CLI you can configure QoS for VoIP by configuring a class-map to classify traffic based on various match criteria and a policy-map command to determine what needs to happen to each class. You then apply the policy to incoming or outgoing traffic on an interface by issuing the service-policy command.

Whats happening above is that you're matching traffic with DSCP EF (Voice RTP traffic) and your DSCP cs3 (Voice signalling traffic) in your class-map.

In your policy map you're then giving each traffic type a certain priority.

Voice RTP - 460kbps

Voice Signalling - 246kbps


esa786_2 Sun, 05/11/2008 - 17:53

Hi. Thank you for your reply. it is mention priority 460, that means 460kbps for voice rtp? but in case of signal it mentiones 246kbps. But in the rtp priority just mention 460 only, is it ok?



Jaime Valencia Sun, 05/11/2008 - 18:35

that means that anything under the voice class will be sent to the PQ, usually it's RTP but it can be whatever you want. on this example is anything that matches DSCP EF


if you want to know what each command does, go thru the above documentation. It covers all the QoS commands

you usually have a definition for the media and another for signaling, that's OK. that's only an example, you would need to define the BW based on your requirements

there are a lot of docs on CCO regarding the subject:

Introduction to QoS Features for Voice

Voice QoS: ToS-CoS Packet Marking for use with LLQ

QoS Features for Voice Introduction

Quality of Service (QoS)

Modular Quality of Service Command-Line Interface Overview



if this helps, please rate


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