Achieving Taildrop on Sup720-3BXL with 1p2q2t

Unanswered Question
Jun 24th, 2008
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Hi all,


I have a situation whereby I would require to configure a taildrop behavior for queue2. The CoS mapping are as follows:


interface GigabitEthernet5/1

wrr-queue cos-map 2 1 4 !CoS 4>Q2 Low priority/Threshold#1

wrr-queue cos-map 2 2 6 7 !CoS 6,7>Q2 High priority/Threshold#2


Basically Q2 is serving UDP traffic. Native ports of SUP720, PFC3BXL doesn't support "taildrop" command "wrr-queue threshold". If I would still require to achieve taildrop behavior in which frames with CoS4 @Threshold#1 gets taildropped when it reaches 90% and CoS6,7 @Threshold#2 gets taildropped when it reaches 100%, would the following config achieve such behavior:


interface GigabitEthernet5/1

wrr-queue random-detect max-threshold 2 90 100

wrr-queue random-detect min-threshold 2 90 100


If it was on a WS-X67xx type cards with 1p3q8t taildrop can be achieved with the following:


interface GigabitEthernet1/1

wrr-queue threshold 3 90 100 100 100 100 100 100 100


Appreciate good advice on this.

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