Cisco WAN QoS question

Posted on 2013-06-25
Last Modified: 2013-06-26
I've got an output QoS policy that sets:

 class TAG-AF21

  set dscp af21

  bandwidth remaining percent 25

Then if I look at the policy-map for our serial Interface, I see this:


    Class-map: TAG-AF21 (match-any)

      9773017 packets, 5141610233 bytes

      5 minute offered rate 1000 bps, drop rate 0 bps

      Match: class-map match-any QOS-STORE-DVR

        9773017 packets, 5141610233 bytes

        5 minute rate 1000 bps

        Match: access-group name QOS-STORE-DVR

          0 packets, 0 bytes

          5 minute rate 0 bps


      queue limit 64 packets

      (queue depth/total drops/no-buffer drops) 0/41163/0

      (pkts output/bytes output) 9731853/5093123403

      QoS Set

        dscp af21

          Packets marked 9773017

      bandwidth remaining 25% (264 kbps)

I have two questions

1) The bandwidth command only comes into play during times of congestion, correct? It can exceed 25% (264 kbps) if there is no other traffic?

2) The total drops referenced in that output -- are those related to QoS queueing drops (due to the bandwidth command) or could they be drops due to something else?

Thanks -- you all have been a big help with QoS before.

Question by:shanepresley
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1 Comment

Accepted Solution

gcl_hk earned 500 total points
ID: 39276921
1. It depend the full list of the QOS map, but for normal situation is "Yes" for your question

2. Yes, this dropping rate is reflect drop on QOS only

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