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10.21

This might (or might not) be of use to someone doing this after me :)

I'm running 15.1(3)T4

My config for this task - i added in bold.

policy-map QOS-OUT
 class WWW
  set ip precedence 2
  bandwidth remaining percent 33
  random-detect
  random-detect ecn

  random-detect precedence 2 4 16 4

According to the SG to get this to work we should just be able to copy http: from R1 to R5.  I've found that I've had to do this from both R5 and SW2 in order to trigger ECN and see RED working.

With just R5 copying from R1 :

   Class-map: WWW (match-all)
      3044 packets, 1765520 bytes
      30 second offered rate 99000 bps, drop rate 0 bps
      Match: access-group 10
      Match: protocol http
      Queueing
      queue limit 64 packets
      (queue depth/total drops/no-buffer drops) 5/0/0
      (pkts output/bytes output) 3044/1765520
      QoS Set
        precedence 2
          Packets marked 3044
      bandwidth remaining 33% (33 kbps)
        Exp-weight-constant: 9 (1/512)
        Mean queue depth: 4 packets
        class     Transmitted     ECN     Random drop      Tail drop          Minimum        Maximum     Mark
                  pkts/bytes     marked pkts/bytes       pkts/bytes          thresh         thresh     prob

        0               0/0             0      0/0              0/0                 20            40  1/10
        1               0/0             0      0/0              0/0                 22            40  1/10
        2     3044/1765520       0      0/0              0/0                  4            16  1/4
        3               0/0             0      0/0              0/0                 26            40  1/10
        4               0/0             0      0/0              0/0                 28            40  1/10
        5               0/0             0      0/0              0/0                 30            40  1/10
        6               0/0             0      0/0              0/0                 32            40  1/10
        7               0/0             0      0/0              0/0                 34            40  1/10

 

with both R5 and SW2 copying from R1:

    Class-map: WWW (match-all)
      2813 packets, 1585735 bytes
      30 second offered rate 103000 bps, drop rate 3000 bps
      Match: access-group 10
      Match: protocol http
      Queueing
      queue limit 64 packets
      (queue depth/total drops/no-buffer drops) 2/67/0
      (pkts output/bytes output) 2746/1547729
      QoS Set
        precedence 2
          Packets marked 2813
      bandwidth remaining 33% (33 kbps)
        Exp-weight-constant: 9 (1/512)
        Mean queue depth: 5 packets
        class     Transmitted     ECN     Random drop      Tail drop          Minimum        Maximum     Mark
                  pkts/bytes     marked pkts/bytes       pkts/bytes          thresh         thresh     prob

        0               0/0             0      0/0              0/0                 20            40  1/10
        1               0/0             0      0/0              0/0                 22            40  1/10
        2     2746/1547729      98     67/38006     0/0                  4            16   1/4
        3               0/0             0      0/0              0/0                 26            40  1/10
        4               0/0             0      0/0              0/0                 28            40  1/10
        5               0/0             0      0/0              0/0                 30            40  1/10
        6               0/0             0      0/0              0/0                 32            40  1/10
        7               0/0             0      0/0              0/0                 34            40  1/10

I've also noticed that the class output no longer shows "explicit congestion notification", although it is clearly doing it.

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