Need explanation: mls qos srr-queue output....

Well I am confused about the example and explanation of the following command:

Platform: 3560 switch during configuring eagress queues.

3560(config)# mls qos srr-queue output dscp-map queue 1 threshold 2 10 11

I am confused about the parameter "threshold id". As far as i understand here the dscp 10 11 are mapped to the egress queue1 and threshold 2.

My question is:

1. What is this threshold used for? What do i think during planning for this thresholds?

2. How many thresh hold can be possible?

thank you.

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Comments

mgeorge

If you read the link posted below, it will probably help you a bunch

http://blog.internetworkexpert.com/2008/03/03/bridging-the-gap-between-3550-and-3560-qos-part-i/

dtlokee

The threshold ID defined the srr threshold of packets in the queue for this traffic before it starts to tail drop the traffic. You can configure 2 drop thresholds for each queue and the third drop threshold is the "queue full" threshold. The idea is if you have a bunch of DSCP values in the same queue you can define a lower (say 40%) threshold for the high drop probability and a value of say 70% for the medium drop probability, and leave the "queue full" state for the low drop probability.

fmubarek

I need to understand mls qos srr-queue

tiersten

fmubarek wrote:

I need to understand mls qos srr-queue

Its in the documentation.