QoS policy issue on a 4500

Unanswered Question
Aug 16th, 2007
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I would like to apply an outbound QoS policy on a L2 interface of my 4507 switch where my WAN router is connected.

As soon as I assign the policy, all traffic is retag as DSCP 0

Here are my QoS policy:

Policy Map WAN-Output-Policy

Class VoIP-RTP-Class

set dscp ef

Class VoIP-Control-Class

set dscp af31

Class Video-Class

set dscp af31

Class SAP-Class

set dscp af21

Class BestEffort-Class

set dscp default

Here is the config of the interface:

interface FastEthernet6/1

description WAN Router 1

switchport mode access

service-policy output WAN-Output-Policy

speed 100

duplex full


The traffic match my different class-map, however it is not tagged as I want

here is the "sh policy-map interface fa6/1"

Service-policy output: WAN-Output-Policy

Class-map: VoIP-RTP-Class (match-any)

2 packets

Match: access-group name VoIP-RTP-Access-List

2 packets

QoS Set

ip dscp ef

Packets marked 0

Class-map: VoIP-Control-Class (match-any)

647 packets

Match: access-group name VoIP-Control-Access-List

647 packets

QoS Set

ip dscp af31

Packets marked 0

Class-map: Video-Class (match-any)

33 packets

Match: access-group name Video-Access-List

33 packets

QoS Set

ip dscp af31

Packets marked 0


Any idea why?

Thanks in advance


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lamav Fri, 08/17/2007 - 05:12
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Why dont you post the entire switch config? You didnt post the class maps, just the policy map...

Tblanchet Fri, 08/17/2007 - 06:46
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Ok, thanks all, I finally found the issue. My policy-maps did match the traffic as I expected (confusion between the source and destination ports). Everything is ok now.

Thank you!

lferral Mon, 10/29/2007 - 23:46
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Hi, I just want to ask you, how did you solve your problem, i am havig the same problem, using a similar policy as you.

any help will be appreciate


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