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Carl Williams
Beginner

3750 to 3850 Qos Mapping

Hi All,

I have spend a considerable amount of time trying to get me head around the QOS marking between the 3750 and the 3850. Basically please look at the configuration below, I have attempted to map the configurations from my 3750 to my 3850 but there is a-little confusion on my part that I would like somebody to clear up.

3750 --- Maps COS frames to fresh hold in each queue simple enough

mls qos srr-queue output cos-map queue 1 threshold 3 5
mls qos srr-queue output cos-map queue 2 threshold 3 3 6 7
mls qos srr-queue output cos-map queue 3 threshold 3 2 4
mls qos srr-queue output cos-map queue 4 threshold 2 1
mls qos srr-queue output cos-map queue 4 threshold 3 0

threshold values assigned to each queue

switch1#show mls qos queue-set 2
Queueset: 2
Queue     :       1       2       3       4
----------------------------------------------
buffers   :        16       6      17      61
threshold1:     149     118  41      42
threshold2:     149     118  68      72
reserved  :      100     100  100    100
maximum   :   149     235   272    242

Now I need to translate this to 3850 MQC Config....

class mapmatch-any cos7
  match cos  7
 class mapmatch-any cos6
  match cos  6
 class mapmatch-any cos5
  match cos  5
    class mapmatch-any cos4
  match cos  4
 class mapmatch-any cos3
  match cos  3
 class mapmatch-any cos2
  match cos  2
 class mapmatch-any cos1
  match cos  1
  class mapmatch-any cos1
  match cos  0
 
 policy map Queue-Limit
 class Queue_1
  queue-limit cos  5 percent 100 < --- threshold 3 is by default 100% so I believe this threshold in the queue should be 100%
 class Queue_2
  queue-limit cos  3 percent 100 < --- threshold 3 is by default 100% so I believe this threshold in the queue should be 100%
  queue-limit cos  6 percent 100 < --- threshold 3 is by default 100% so I believe this threshold in the queue should be 100%
  queue-limit cos  7 percent 100 < --- threshold 3 is by default 100% so I believe this threshold in the queue should be 100%
 class Queue_3
  queue-limit cos  2 percent 100 < --- threshold 3 is by default 100% so I believe this threshold in the queue should be 100%
  queue-limit cos  4 percent 100 < --- threshold 3 is by default 100% so I believe this threshold in the queue should be 100%
  class Queue_4
  queue-limit cos  1 percent 72 < --- threshold 2 is 72 percent
  queue-limit cos  0 percent 100 < --- threshold 3 is by default 100% so I believe this threshold in the queue should be 100%

Just confirming that my thinking makes sense. It looks correct to me.

kind regards

Carl Williams

1 REPLY 1
Mark Malone
VIP Mentor

Have you seen this doc may help 3750 MLS to 3850 MQC qos conversion may help

http://www.cisco.com/c/en/us/support/docs/switches/catalyst-3850-series-switches/118629-technote-qos-00.html