ASR1002-F Packet drops with shaping

Unanswered Question
Apr 19th, 2010
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Hi,


I have a strange behaiver since we're introduced the ASR1002-F with activ MQC Shaping. The default value of the tc time is on the ASR at 4ms what

I improve to 20ms. The drops getting better but this couldn't be the solution. What I think is that the default queue-limit is to small on the ASR.

If I ingrees it to higher value for example 4 times the default the dropps went away.


That someone now what is the formula for calc the queue size on the router or what is the best practice?


Hier the config and output:


policy-map qos_P30_G0_S0
class Platinum
    priority
    police cir percent 30
class Rp/mgt
    bandwidth percent 1
class class-default
   set ip precedence 0
    fair-queue
policy-map qos_20Mb_P30_G0_S0
class class-default
    shape average 20000000 400000
   service-policy qos_P30_G0_S0



ip-bord-ch-gen-r-002#sh policy-map int
GigabitEthernet0/0/0.2517

  Service-policy output: qos_20Mb_P30_G0_S0

    Class-map: class-default (match-any) 
      161769 packets, 53685907 bytes
      5 minute offered rate 76000 bps, drop rate 0000 bps
      Match:  any
      Queueing
      queue limit 83 packets
      (queue depth/total drops/no-buffer drops) 0/254/0
      (pkts output/bytes output) 161515/53520087
      shape (average) cir 20000000, bc 400000, be 400000 (changed to tc 20ms)
      target shape rate 20000000

      Service-policy : qos_P30_G0_S0

        queue stats for all priority classes:
          Queueing
          queue limit 512 packets
          (queue depth/total drops/no-buffer drops) 0/0/0
          (pkts output/bytes output) 0/0

        Class-map: Platinum (match-any) 
          0 packets, 0 bytes
          5 minute offered rate 0000 bps, drop rate 0000 bps
          Match:  ip precedence 5
          Priority: Strict, b/w exceed drops: 0
         
          police:
              cir 30 %
              cir 6000000 bps, bc 187500 bytes
            conformed 0 packets, 0 bytes; actions:
              transmit
            exceeded 0 packets, 0 bytes; actions:
              drop
            conformed 0000 bps, exceed 0000 bps

        Class-map: Rp/mgt (match-any) 
          1712 packets, 290582 bytes
          5 minute offered rate 0000 bps, drop rate 0000 bps
          Match:  ip precedence 6  7
          Queueing
          queue limit 64 packets
          (queue depth/total drops/no-buffer drops) 0/0/0
          (pkts output/bytes output) 1712/290582
          bandwidth 1% (200 kbps)

        Class-map: class-default (match-any) 
          160057 packets, 53395325 bytes
          5 minute offered rate 75000 bps, drop rate 0000 bps
          Match:  any
          Queueing
          queue limit 83 packets (default value if i ingrees 4 times no dropps)
          (queue depth/total drops/no-buffer drops/flowdrops) 0/254/0/0
          (pkts output/bytes output) 159803/53229505
          QoS Set
            ip precedence 0
              No packet marking statistics available
          Fair-queue: per-flow queue limit 20
ip-bord-ch-gen-r-002#



thx for your help

Dani

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