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anowell
Beginner

QoS - Policy-Map order of operation?

If I have a policy-map that uses 10 different classes but my "priority" class is located at the bottom, is it still scheduled first within an interval?  I would assume it is, but I'm confused because I know that policy-maps are processed in a top-down fashion like an ACL.

Thank you!

7 REPLIES 7
Joseph W. Doherty
Hall of Fame Expert

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Posting

That curious.  I only recall always seeing LLQ classes listed before all non-LLQ classes, and the default class, if explicitly listed, listed last.

What platform and IOS?

Thanks for the help!

IOSv Software (VIOS-ADVENTERPRISEK9-M), Version 15.6(2)T

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages wha2tsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

I've haven't looked, but I would presume that a fairly new IOS version.  Maybe it's a "feature".  Or, perhaps, as it's a "T" train, a bug.

Do the corresponding manuals mention anything?

I have this same question. If the LLQ class is below the non-LLQ class is the priority queue handle first on a serial interface?

LLQ should be dequeued before any other class.

Regardless of the order of the classes in a policy map. Meaning if the LLQ is below a NON-LLQ in the POlicy Map order...the LLQ should be processed first?

Correct.

BTW, I believe I seen some platforms list LLQ policy classes first, regardless how they were entered.  (Likewise, default class, if explicitly defined, is listed last.)