CatOS set qos wred

Unanswered Question
May 30th, 2009
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Hi all,


in a queue like this:


set qos wred 1p2q2t tx queue 1 0:80 0:100


how can i calculate the MPD?


for queue 1 min th is 0 and max is 80 but what's % of drop probability discard?


the same in a queue like this is IOS:


wrr-queue random-detect max-threshold 1 80 100 100 100 100 100 100 100


so i know that max-threshold is 80% of buffer queue and i know default min-thresold but what's MPD?how can i calculate % of dropping beetwen 40% and 80% or (for CatOS examples from 0% to 80%)?


tnx a have nice day



Das

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Giuseppe Larosa Mon, 06/01/2009 - 09:26
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Hello Danilo,

I've checked catos 8.7 documentation for C6500 and MPD is not mentioned.

I think you cannot configure it and this should mean it is fixed to 1 so that drop probability grows from 0 to 1 going from low threshold (that defaults to 0) to 1 at high threshold.


This happens for example also for some linecards of GSR that doesn't allow to configure MPD (if I remember correctly in engine2 linecards)


Hope to help

Giuseppe


danilodicesare Mon, 06/01/2009 - 11:43
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Hi Giuseppe,


tnx for answering.


seems quite silly not having a way to configure that parameter.


I know that, if not explicit, default should be 1 but could be useful having some stuff like this documented :).


tnx again



Das

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