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QoS config on campus 6500

I previously put this is the 'Video over IP' discussions group, which is not getting any response.

I have a 6509 and need to configure QoS on gig line cards that have 1P3Q8T queue structure.

I've already got the mls qos configured, and have the correct class maps built for Voice, Video, and Signalling.

(I'm not doing autoqos). I have only four classes; voice, video, signalling, and default (best effort).

I need to configure the commands on the individual gig ports for the appropriate bandwidths as shown below:

1. 300 VoIP G711 calls x 100kbs/call = 30mbs of priority queue  DSCP = EF (46) CoS = 5

2. 150 Video conference calls x 1.5mbs/call = 225mbs  DSCP = CS4 (32) CoS = 4

3. 450 Signalling x 13kps/call = 5.8mbs (round to 6mbs) DSCP = CS3 (24) CoS = 3

4. Default class is not marked  DSCP & CoS = 0

I'm thinking of using the following bandwidth/queue values on the gig ports:

P Queue (voice) = 15%

Queue 3 (video) = 25%

Queue 2 (signalling) = 10%

Queue 1 (best effort) = 50%

Other than the first two lines, does the interface config below look correct for what I want?

wrr-queue queue-limit xx xx xx  (I don't know how to set the buffer allocation - any help would be appreciated)

priority-queue queue-limit xx

wrr-queue bandwidth 50 10 25

wrr-queue random-detect 1

wrr-queue random-detect 2

wrr-queue random-detect 3

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

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

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

wrr-queue random-detect min-threshold 2 80 100 100 100 100 100 100 100

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

wrr-queue random-detect max-threshold 3 80 100 100 100 100 100 100 100

wrr-queue cos-map 1 1 0

wrr-queue cos-map 2 1 3

wrr-queue cos-map 3 1 4

priority-queue cos-map 1 5

Does that look about right?

1 REPLY
Cisco Employee

QoS config on campus 6500

Hello,

wrr-queue queue-limit xx xx xx  - does not change total buffer allocation - it just consider the portion of buffer handled by each queue.

This example shows how to configure the buffer size ratio of the four queues. The ratio of the buffer allocated for each queue is 1/10, 1/5, 3/10 and 2/5 to queue 1, 2, 3, and 4. (Queue 4 is four times larger than queue 1, twice as large as queue 2, and 1.33 times as large as queue 3.)

Switch(config)#

interface gigabitethernet0/1

Switch(config-if)#

wrr-queue queue-limit 1 2 3 4

So for you "wrr-queue queue-limit 50 10 25" +  "priority-queue queue-limit 15"should be fine based on your decision on how to split the queue for classes.

All the rest look fine.

Nik

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