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MLS QoS - minimum band for cos 0, maximum for cos 5

Sergey Prishchepa
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Hello everybody!

 

There are several switches 2960, between which it is necessary to limit the traffic cos 0 and give at least half of the bandwidth to cos 5. After reading here https://www.cisco.com/c/en/us/support/docs/switches/catalyst-3750-series-switches/116089-technote-switches-output-drops-qos-00.html and here https://reaper81.wordpress.com/2012/03/07/catalyst-qos/ I ended up with this configuration:

int f0/1
switchport mode access mls qos cos 5 mls qos cos override ! int f0/2
switchport mode trunk mls qos trust cos queue-set 2 priority-queue out
!I give 50% of the first egress queues srr-queue bandwidth shape 2 0 0 0 srr-queue bandwidth share 1 30 35 5 !
!traffic from COS 0 should go to the 4th queue and be dropped at the 1st drop threshold.
mls qos srr-queue output cos-map queue 4 threshold 1 0
!traffic from COS 5 should go to the 1st priority queue and be dropped when the last 3rd drop threshold is reached.
mls qos srr-queue output cos-map queue 1 threshold 3 5
mls qos queue-set output 2 buffers 50 20 20 10

 

Threshold for queue-set 2, I think for now, leave it by default, or advise you to set up some values right away?

 

Tell me, please, am I doing everything right or what needs to be changed?

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