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wrr qos question

wrr-queue bandwidth 10 20 70 1

wrr-queue min-reserve 1 5

wrr-queue min-reserve 2 6

wrr-queue min-reserve 3 7

wrr-queue min-reserve 4 8

wrr-queue cos-map 1 0 1

wrr-queue cos-map 2 2 4

wrr-queue cos-map 3 3 6 7

wrr-queue cos-map 4 5

priority-queue out

what does the wrr-queue min-reserve do exactly?

2 REPLIES

Re: wrr qos question

Hi!

"wrr-queue min-reserve" assign the buffer size to a queue. By default, is assigned the value of “100″. This means that every queue mapped to this level will have 100 buffers allocated.

If your case this is modified by interface level wrr command:

wrr-queue min-reserve 1 5 -> 50 buffers to queue 1

wrr-queue min-reserve 2 6 -> 60 buffers to queue 2

wrr-queue min-reserve 3 7 -> 70 buffers to queue 3

wrr-queue min-reserve 4 8 -> 80 buffers to queue 4

Cheers,

Calin

Re: wrr qos question

Hello.

The min-reserve allocates how many packets can be stored in each queue. In your config you have priority Q4 set for min-reserve level 8, you should see in your global config a command 'mls qos min-reserve 8 x' Where x is the number of packets allowed to fill up on that queue. The larger the size of the queue the more packets can be stored before the switch starts dropping them, it also means the larger your queue the more delay packets could experience instead of being dropped, but in FE and bigger BW the delay should be negligible.

This link has an explanation for 3550

http://www.cisco.com/en/US/tech/tk389/tk813/technologies_tech_note09186a00801558cb.shtml#topic8

Simon

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