MQC LLC QOS not working with WS-X6704-10GE

Answered Question
Jan 7th, 2009
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I have a site trying to do the following:


service-policy output voip


and receives the following error:


priority command is not supported in output direction for this interface


I found that the WS-X6704-10GE doesn't support "priority" queueing. So, what line cards will support priority queueing on a CAT 6509? Or is there another way to configure?



Correct Answer by Jon Marshall about 8 years 4 months ago

Ah okay. You can't use the MQC LLC priority command set because you don't use MQC commands for egress queueing on catalyst switches.


The 6704-10GE does have a priority queue which you can use for priority traffic for voice etc. but you don't configure it with the priority command. You need to set up which CoS/Dscp values go to which queue and how much bandwidth each queue gets.


Attached is a link to QOS config on 6500 with an example including a priority queue -


http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SXF/native/configuration/guide/qos.html#wp1750910


Jon

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Jon Marshall Wed, 01/07/2009 - 14:37
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Richard


"I found that the WS-X6704-10GE doesn't support "priority" queueing."


Where did you find confirmation of this because these 2 docs suggest that the 6704-10GE has a TX queue system of 1p7q8t -


http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/product_data_sheet09186a00801dce34_ps4835_Products_Data_Sheet.html


http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_white_paper09186a0080131086.html


Jon

rlortiz Wed, 01/07/2009 - 14:43
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Jon,


I googled it and found the following information:


> priority command is not supported in output direction for this interface

>

> Configuration failed!


Yup! It did! ..and it will on ws-x65xx, 67xx, and 68xx cards. You need

OSM, SIP/SPA, or 20G line cards for MQC LLQ (low latency queuing, aka.

'priority' in the policy-map) to work.


So, I went from that information. If I am wrong about this, then why am I getting the "not supported" error?

Correct Answer
Jon Marshall Wed, 01/07/2009 - 14:52
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Ah okay. You can't use the MQC LLC priority command set because you don't use MQC commands for egress queueing on catalyst switches.


The 6704-10GE does have a priority queue which you can use for priority traffic for voice etc. but you don't configure it with the priority command. You need to set up which CoS/Dscp values go to which queue and how much bandwidth each queue gets.


Attached is a link to QOS config on 6500 with an example including a priority queue -


http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SXF/native/configuration/guide/qos.html#wp1750910


Jon

rlortiz Wed, 01/07/2009 - 14:54
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I see..Okay..Thanks, that makes total sense.

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