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3560 CBWFQ

Unanswered Question
Jul 6th, 2006
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I am trying to implement CBWFQ on a cisoc 3560 switch.

One switch has Version 12.1(19r)EA1b and it does not work, when you enter in one of the interfaces service policy output test-voice you get the message Warning: Assigning a policy map to the output side of an interface not supported.

However, On another customers site this works on a lower version of software.

Has anyone else seen this and is there a workaround without upgrading or downgrading the ios ???

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Aaron Harrison Thu, 07/06/2006 - 06:10
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The thing to consider here is that although commands appear in the CLI you can't necessarily use them...

On a router you construct a policy-map with any number of classes in it, and the prioritisation is done in software.

On a switch, you have a finite number of queues (4, or 3 + 1 PQ). To manage these queues you don't use a policy map, but configure the srr-queue commands per interface (and also the various maps under the global 'mls qos...' commands.

Policy-maps on the switch are used only for inbound classification of traffic, remarking, and a couple of other functions such as policing, like so:



set dscp ef

police 128000 8000 exceed-action drop


set dscp af31

police 32000 8000 exceed-action policed-dscp-transmit


set dscp af41

police 496000 8000 exceed-action policed-dscp-transmit


police 10000000 8000 exceed-action policed-dscp-transmit

set dscp af21

class class-default

police 10000000 8000 exceed-action policed-dscp-transmit

set dscp default

I'm guessing that the earlier version of IOS you mentioned simply didn't have the warning message - CBWFQ just isn't available on the 3560s.

Have a look at the QoS section of the manual - it's not a clear or simple subject, so feel free to post back any questions:




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