По непонятной мне причине трафик с IP Precedence 6 попадает и в описанный для него класс и в class-default. Может кто-нибудь объяснит.

Кусок конфига и вывод ниже.

class-map match-any qos_network_control
  match ip precedence 6
  match ip precedence 7

policy-map qos_out
  class qos_network_control
   bandwidth percent 5
  class class-default
   fair-queue 256
   random-detect

xxxx#sh policy-map interface yyyy
Service-policy output: qos_out
   Class-map: qos_network_control (match-any)
      8476 packets, 1753461 bytes
      30 second offered rate 6000 bps, drop rate 0 bps
      Match: ip precedence 6
        8476 packets, 1753461 bytes
        30 second rate 6000 bps
      Match: ip precedence 7
        0 packets, 0 bytes
        30 second rate 0 bps
      Queueing
        Output Queue: Conversation 267
        Bandwidth 5 (%)
        Bandwidth 102 (kbps) Max Threshold 64 (packets)
        (pkts matched/bytes matched) 6458/1448608
        (depth/total drops/no-buffer drops) 0/0/0
    Class-map: class-default (match-any)
      924538 packets, 351737683 bytes
      30 second offered rate 1548000 bps, drop rate 0 bps
      Match: any
      Queueing
        Flow Based Fair Queueing
        Maximum Number of Hashed Queues 256
        (total queued/total drops/no-buffer drops) 49/7249/428
         exponential weight: 9

  class    Transmitted      Random drop      Tail drop    Minimum Maximum  Mark
           pkts/bytes       pkts/bytes       pkts/bytes    thresh  thresh  prob
      0  941763/359675429    1297/223172      5524/983376      20      40  1/10
      1       0/0               0/0              0/0           22      40  1/10
      2       0/0               0/0              0/0           24      40  1/10
      3       0/0               0/0              0/0           26      40  1/10
      4       0/0               0/0              0/0           28      40  1/10
      5       0/0               0/0              0/0           30      40  1/10
      6    2444/1231482         0/0              0/0           32      40  1/10
      7       0/0               0/0              0/0           34      40  1/10
   rsvp       0/0               0/0              0/0           36      40  1/10