ip dscp vs dscp

Согласно документации, match ip dscp используется при обработке ipv4 пакетов, а match dscp при обработке ipv4 и ipv6 (matching on both IPv4 and IPv6 packets is the default).
В классах можно написать и так и так:

router(config-cmap)#match dscp ?
  <0-63>   Differentiated services codepoint value
  af11     Match packets with AF11 dscp (001010)
  af12     Match packets with AF12 dscp (001100)
  af13     Match packets with AF13 dscp (001110)
  af21     Match packets with AF21 dscp (010010)
  af22     Match packets with AF22 dscp (010100)
  af23     Match packets with AF23 dscp (010110)
  af31     Match packets with AF31 dscp (011010)
  af32     Match packets with AF32 dscp (011100)
  af33     Match packets with AF33 dscp (011110)
  af41     Match packets with AF41 dscp (100010)
  af42     Match packets with AF42 dscp (100100)
  af43     Match packets with AF43 dscp (100110)
  cs1      Match packets with CS1(precedence 1) dscp (001000)
  cs2      Match packets with CS2(precedence 2) dscp (010000)
  cs3      Match packets with CS3(precedence 3) dscp (011000)
  cs4      Match packets with CS4(precedence 4) dscp (100000)
  cs5      Match packets with CS5(precedence 5) dscp (101000)
  cs6      Match packets with CS6(precedence 6) dscp (110000)
  cs7      Match packets with CS7(precedence 7) dscp (111000)
  default  Match packets with default dscp (000000)
  ef       Match packets with EF dscp (101110)

router(config-cmap)#match ip dscp ?
  <0-63>   Differentiated services codepoint value
  af11     Match packets with AF11 dscp (001010)
  af12     Match packets with AF12 dscp (001100)
  af13     Match packets with AF13 dscp (001110)
  af21     Match packets with AF21 dscp (010010)
  af22     Match packets with AF22 dscp (010100)
  af23     Match packets with AF23 dscp (010110)
  af31     Match packets with AF31 dscp (011010)
  af32     Match packets with AF32 dscp (011100)
  af33     Match packets with AF33 dscp (011110)
  af41     Match packets with AF41 dscp (100010)
  af42     Match packets with AF42 dscp (100100)
  af43     Match packets with AF43 dscp (100110)
  cs1      Match packets with CS1(precedence 1) dscp (001000)
  cs2      Match packets with CS2(precedence 2) dscp (010000)
  cs3      Match packets with CS3(precedence 3) dscp (011000)
  cs4      Match packets with CS4(precedence 4) dscp (100000)
  cs5      Match packets with CS5(precedence 5) dscp (101000)
  cs6      Match packets with CS6(precedence 6) dscp (110000)
  cs7      Match packets with CS7(precedence 7) dscp (111000)
  default  Match packets with default dscp (000000)
  ef       Match packets with EF dscp (101110)

Только вот в итоге получается странная ситуация, когда в классе dscp без ip пусто, а нужный пакет попадает в class-default

[skip]
        Class-map: CRITICAL (match-all)
          0 packets, 0 bytes
          30 second offered rate 0 bps, drop rate 0 bps
          Match:  dscp af31 (26)
          Queueing
          queue limit 64 packets
          (queue depth/total drops/no-buffer drops) 0/0/0
          (pkts output/bytes output) 0/0
          bandwidth 500 kbps

        Class-map: class-default (match-any)
          1221 packets, 206132 bytes
          30 second offered rate 64000 bps, drop rate 0 bps
          Match: any
          Queueing
          queue limit 64 packets
          (queue depth/total drops/no-buffer drops/flowdrops) 0/0/0/0
          (pkts output/bytes output) 1556/225992
          Fair-queue: per-flow queue limit 16
            Exp-weight-constant: 9 (1/512)
            Mean queue depth: 0 packets
            dscp     Transmitted       Random drop      Tail/Flow drop Minimum Maximum Mark
                      pkts/bytes    pkts/bytes       pkts/bytes    thresh  thresh  prob

            default      725/75020           0/0              0/0                 20            40  1/10
            cs2            2/114             0/0              0/0                 24            40  1/10
            af31        1291/213297          0/0              0/0                 32            40  1/10

После изменения класса на match ip dscp все заработало как надо:

        Class-map: CRITICAL (match-all)
          59085 packets, 9809972 bytes
          30 second offered rate 49000 bps, drop rate 0 bps
          Match: ip dscp af31 (26)
          Queueing
          queue limit 64 packets
          (queue depth/total drops/no-buffer drops) 0/0/0
          (pkts output/bytes output) 59085/9809972
          bandwidth 500 kbps

        Class-map: class-default (match-any)
          18241 packets, 3680987 bytes
          30 second offered rate 12000 bps, drop rate 0 bps
          Match: any
          Queueing
          queue limit 64 packets
          (queue depth/total drops/no-buffer drops/flowdrops) 0/0/0/0
          (pkts output/bytes output) 37948/4614391
          Fair-queue: per-flow queue limit 16
            Exp-weight-constant: 9 (1/512)
            Mean queue depth: 0 packets
            dscp     Transmitted       Random drop      Tail/Flow drop Minimum Maximum Mark
                      pkts/bytes    pkts/bytes       pkts/bytes    thresh  thresh  prob

            default    38097/4629021         0/0              0/0                 20            40  1/10
            cs2          106/6042            0/0              0/0                 24            40  1/10

Такие дела...