혼잡 시 서비스 별로 가중치를 적용하여 지정해준 범위 안에서 드랍을 시켜 하향 평준화를 예방 할 수 있다.

셋팅

class-map match-any ftp

 match  precedence 3

!

policy-map queuing-1

 class ftp

  bandwidth 2000

  random-detect

  random-detect precedence 3   20    40    10

!

interface FastEthernet0/1

 service-policy output queuing-1

적용후

HQ_SE_Core_R1#show policy-map int f0/1

 FastEthernet0/1

  Service-policy output: queuing-1

    Class-map: nftp (match-any)

      532228 packets, 543139170 bytes

      5 minute offered rate 6785000 bps, drop rate 0 bps

      Match:  precedence 3

        532228 packets, 543139170 bytes

        5 minute rate 6785000 bps

      Queueing

        Output Queue: Conversation 265

        Bandwidth 2000 (kbps)

        (pkts matched/bytes matched) 18/22908

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

         exponential weight: 9

         mean queue depth: 0

class    Transmitted      Random drop      Tail drop   Minimum  Maximum  Mark

           pkts/bytes       pkts/bytes           pkts/bytes    thresh    thresh      prob

      0       0/0                   0/0                 0/0            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  532228/543139170    0/0                 0/0            20         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       0/0                   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

    Class-map: class-default (match-any)

      284 packets, 22485 bytes

      5 minute offered rate 2000 bps, drop rate 0 bps

      Match: any