Policy map is dropping prioritized traffic

From: Gregory Gombas (ggombas@gmail.com)
Date: Thu Aug 16 2007 - 23:02:08 ART

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Hi All,

I have a policy map applied to my frame-relay subinterface via a map-class.
The policy-map is giving 2kbps priority to ICMP, however when the link
is congested, all ICMP is dropped. I am only sending pings at rate of
.256kbps.

R1#show policy-map int ser0/0.2
 Serial0/0.2: DLCI 102 -

  Service-policy output: ICMP

    Class-map: ICMP (match-all)
      29 packets, 1856 bytes
      30 second offered rate 0 bps, drop rate 0 bps
      Match: protocol icmp
      Queueing
        Strict Priority
        Output Queue: Conversation 24
        Bandwidth 10 (%)
        Bandwidth 2 (kbps) Burst 50 (Bytes)
        (pkts matched/bytes matched) 18/1152
        (total drops/bytes drops) 18/1152

    Class-map: EIGRP (match-all)
      8 packets, 512 bytes
      30 second offered rate 0 bps, drop rate 0 bps
      Match: protocol eigrp
      Queueing
        Strict Priority
        Output Queue: Conversation 24
        Bandwidth 10 (%)
        Bandwidth 2 (kbps) Burst 50 (Bytes)
        (pkts matched/bytes matched) 0/0
        (total drops/bytes drops) 0/0

    Class-map: class-default (match-any)
      4523 packets, 6738417 bytes
      30 second offered rate 914000 bps, drop rate 873000 bps
      Match: any
R1#

However, when I change the priority to 5kbps for ICMP, no packets get dropped:

R1#show policy-map int ser0/0.2
 Serial0/0.2: DLCI 102 -

  Service-policy output: ICMP

    Class-map: ICMP (match-all)
      43 packets, 2752 bytes
      30 second offered rate 0 bps, drop rate 0 bps
      Match: protocol icmp
      Queueing
        Strict Priority
        Output Queue: Conversation 24
        Bandwidth 20 (%)
        Bandwidth 5 (kbps) Burst 125 (Bytes)
        (pkts matched/bytes matched) 27/1728
        (total drops/bytes drops) 0/0

    Class-map: EIGRP (match-all)
      10 packets, 640 bytes
      30 second offered rate 0 bps, drop rate 0 bps
      Match: protocol eigrp
      Queueing
        Strict Priority
        Output Queue: Conversation 24
        Bandwidth 10 (%)
        Bandwidth 2 (kbps) Burst 50 (Bytes)
        (pkts matched/bytes matched) 0/0
        (total drops/bytes drops) 0/0

    Class-map: class-default (match-any)
      4571 packets, 6802948 bytes
      30 second offered rate 1141000 bps, drop rate 1097000 bps
      Match: any
R1#

Any ideas why ICMP was dropping when I was sending way below the priority rate?

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