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Understanding egress queueing issues

Hi,

I have been researching about QoS and egress queuing configuration. And i don't fully understand the function of each command. I understand that each interface have a queues (the number depends on the model of the router or switch and also i think you can configure them) and you provision the bandwidth and the thresholds to have a better performance. If it helps the equipment i an working on is a Cisco 7609-S

So i put my comments below of how i think the commands works, and maybe you can correct or help me understand better.

 

wrr-queue bandwidth percent 0 0 10 12 25 50 3

!we provision 0% for queue 1, 0% for queue 2, 10% for queue 3.. and so on...

 wrr-queue queue-limit 0 0 10 12 25 50 3

!Reserves the buffer space for the ques, 0% for queue 1, 0% for queue 2, 10% for queue 3... and so on..

 wrr-queue random-detect min-threshold 3 70 1 1 1 1 1 1 1

!I dont understand this one :(

 wrr-queue random-detect min-threshold 4 70 1 1 1 1 1 1 1

 wrr-queue random-detect min-threshold 5 70 80 1 1 1 1 1 1

 wrr-queue random-detect min-threshold 6 100 1 1 1 1 1 1 1

 wrr-queue random-detect min-threshold 7 100 1 1 1 1 1 1 1

 wrr-queue random-detect max-threshold 3 100 1 1 1 1 1 1 1

 wrr-queue random-detect max-threshold 4 100 1 1 1 1 1 1 1

!I dont understand this one :(

 wrr-queue random-detect max-threshold 5 90 100 1 1 1 1 1 1

 wrr-queue random-detect max-threshold 6 100 1 1 1 1 1 1 1

 wrr-queue random-detect max-threshold 7 100 1 1 1 1 1 1 1

 wrr-queue random-detect 4
!I think we dont need this command because the commands above activate wrr on this queue.

 wrr-queue random-detect 5

 wrr-queue cos-map 3 1 0

!We assign de cos values 1 and 0 to the queue 3

 wrr-queue cos-map 4 1 1

 wrr-queue cos-map 5 1 2

 wrr-queue cos-map 5 2 3

 wrr-queue cos-map 6 1 4

 wrr-queue cos-map 7 1 6 7

 tag-switching ip

 mls qos trust cos

!We tell the port tu trust the CoS field, otherwhise it wont analize de CoS field for QoS.

 

I am really struguling with this.

Thanks in advance.

Regards,

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