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QoS priority queueing on Cat 6500

Just a quick configuration question!! Why does the config line for priority queueing does not appear in running config. How to verify that it is setup properly?

For example "priority-queue cos-map 1 5"

will not appear in the running config.

Any thoughts!!!

1 REPLY
Hall of Fame Super Blue

Re: QoS priority queueing on Cat 6500

Hi

Because this is the default ie. COS value 5 is mapped to the priority queue (assuming the module has one).

If you went onto an interface and did

int gi8/1

priority-queue cos-map 1 3

then it would then show in the running config as

int gi8/1

priority-queue cos-map 1 3 5

because you have changed from the default.

To verify see this example from one of our 6500 switches

SZ-JFH-F00-DTE1#sh queueing int gi8/1

Interface GigabitEthernet8/1 queueing strategy: Weighted Round-Robin

Port QoS is enabled

Trust state: trust DSCP

Extend trust state: not trusted [COS = 0]

Default COS is 0

Queueing Mode In Tx direction: mode-cos

Transmit queues [type = 1p2q2t]:

Queue Id Scheduling Num of thresholds

-----------------------------------------

1 WRR low 2

2 WRR high 2

3 Priority 1 ***** priority queue is mapped to queue 3 *****

WRR bandwidth ratios: 100[queue 1] 255[queue 2]

queue-limit ratios: 70[queue 1] 15[queue 2] 15[Pri Queue]*same as Q2

queue random-detect-min-thresholds

----------------------------------

1 40[1] 70[2]

2 40[1] 70[2]

queue random-detect-max-thresholds

----------------------------------

1 70[1] 100[2]

2 70[1] 100[2]

queue thresh cos-map

---------------------------------------

1 1 0 1

1 2 2 3

2 1 4 6

2 2 7

3 1 5 ***** and here is cos value 5 mapped to queue 3 by default *****

Queueing Mode In Rx direction: mode-cos

Receive queues [type = 1q2t]:

Queue Id Scheduling Num of thresholds

-----------------------------------------

1 Standard 2

queue tail-drop-thresholds

--------------------------

1 100[1] 100[2]

queue thresh cos-map

---------------------------------------

1 1 0 1 2 3 4 5 6 7

SZ-JFH-F00-DTE1#

HTH

Jon

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