From: iosluver@gmail.com
Date: Thu Nov 22 2007 - 13:08:55 ART
Hi Group,
I read a CCO document which seemed to imply that when the expedite queue is enabled with priority queue out, Q4 is not used. My understanding of this & the output of "sh mls qos int g0/1 queueing" (correct me if I'm wrong) is:-
If Priority Queue is enabled, the queuing strategy will empty Q4 & check for example Q1. The checks Q4, if there no packets, it moves to Q2. And continues in this manner giving priority to Q4.
IF Priority queue is disabled, the queuing strategy for the Q4 then depend on the weight, queue limit defined for the port in question.
With Expedite disabled
**********************
interface GigabitEthernet0/1
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 3
wrr-queue cos-map 3 4
wrr-queue cos-map 4 5 6 7
end
sh mls qos int g0/1 qu
GigabitEthernet0/1
Egress expedite queue: dis
wrr bandwidth weights:
qid-weights
1 - 20
2 - 15
3 - 15
4 - 50
With Expedite enabled
**********************
interface GigabitEthernet0/1
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 3
wrr-queue cos-map 3 4
wrr-queue cos-map 4 5 6 7
priority-queue out
end
sh mls qos int g0/1 queueing
GigabitEthernet0/1
Egress expedite queue: ena
wrr bandwidth weights:
qid-weights
1 - 20
2 - 15
3 - 15
4 - 50 when expedite queue is disabled
Thanks
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