[c-nsp] Question about CBWFQ and PING times

[Andy Saykao]

Hi Peter,

Yes, it's a SPA in the SIP-400 that we add the service-policy to. DTS
and hierarchical qos should be supported as per the data sheet, and I'll
bring it up with our Cisco rep to see what the deal is.

> Consider the "bandwidth" parameter strictly informational.

How misleading is that then. When you issue the "show policy-map"
command, it calculates the bandwidth % using what's set with the
bandwidth interface command. I'll make a note to disregard this piece of
cosmetic from cisco when using the "show policy-map" command.

Just a few things with the "show policy-map" command. 

1/ There's an "offered rate" for each class - is this the amount of
bandwidth the router is currently reserving for each class?

POP2#sh policy-map int g4/0/2

 GigabitEthernet4/0/2

  Service-policy output: POP2-POP1-QOS-POLICY

  Counters last updated 00:00:00 ago

    Class-map: POP2-POP1-PRIORITY-CLASS (match-all)
      299895137 packets, 119941773853 bytes
      30 second offered rate 1887000 bps, drop rate 0 bps
      Match: access-group name POP2-POP1-PRIORITY-ACL
      Queueing
      queue limit 2500 packets
      (queue depth/total drops/no-buffer drops) 0/0/0
      (pkts output/bytes output) 299892091/119940222481

      bandwidth 5% (10000 kbps)

    Class-map: class-default (match-any)
      19483508661 packets, 15273909817898 bytes
      30 second offered rate 115958000 bps, drop rate 0 bps
      Match: any

POP2#sh access-lists POP2-POP1-PRIORITY-ACL
Extended IP access list POP2-POP1-PRIORITY-ACL
    20 permit ip 210.15.254.0 0.0.0.255 any
    30 permit ip 203.10.110.0 0.0.0.255 any
    40 permit ip 210.15.210.0 0.0.0.255 any
    50 permit ip 203.17.103.0 0.0.0.255 any
    60 permit icmp any any

2/ One odd thing I've found is that when I permit additional icmp's to
the ACL, the "offered rate" rapidly decreases until the "offered rate"
is ZERO. 

    70 permit icmp any any echo-reply
    80 permit icmp any any traceroute

POP2#sh policy-map int g4/0/2

 GigabitEthernet4/0/2

  Service-policy output: POP2-POP1-QOS-POLICY

  Counters last updated 00:00:00 ago

    Class-map: POP2-POP1-PRIORITY-CLASS (match-all)
      300148641 packets, 120077235727 bytes
      30 second offered rate 0 bps, drop rate 0 bps
      Match: access-group name POP2-POP1-PRIORITY-ACL
      Queueing
      queue limit 2500 packets
      (queue depth/total drops/no-buffer drops) 0/0/0
      (pkts output/bytes output) 300150499/120077414678

      bandwidth 5% (10000 kbps)

    Class-map: class-default (match-any)
      19493929309 packets, 15281493202187 bytes
      30 second offered rate 0 bps, drop rate 0 bps
      Match: any

The throughput on the interface is still as expected.

POP2#sh int g4/0/2
  30 second input rate 50875000 bits/sec, 18880 packets/sec
  30 second output rate 117992000 bits/sec, 20690 packets/sec

Why does adding the extra icmp lines in the ACL cause the "offered rate"
to be zero in both classes???

Cheers.

Andy

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