RE: Byte Limit on CB Shaping

From: Dennis J. Hartmann (dhartma5@optonline.net)
Date: Sun May 01 2005 - 13:38:40 GMT-3


        Bc is always CIR/32 or 1500 bytes (if CIR/32 is lower than 1500
bytes). Be is always 2x Bc. I hope this helps.

Sincerely,

Dennis Hartmann

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
gladston@br.ibm.com
Sent: Friday, April 29, 2005 4:18 PM
To: ccielab@groupstudy.com
Subject: Byte Limit on CB Shaping

Do you know how to configure Be when using CB Shaping?
On the following example I did not specified it, and it defaults to 9600
(Wendell's DQoS indicates that too)

As the Byte Limit showed is Bc + Be (2400), I am considering it is really
using Be. (which would be the same with GTS, that shows Be = Bc and byte
limit equaus Be/8 + Bc/8).
Would you agree?

Rack2R3#sh pol
Rack2R3#sh policy-map int ser 1/3

 Serial1/3

  Service-policy output: shape-all

    Class-map: class-default (match-any)
      468 packets, 418802 bytes
      5 minute offered rate 3000 bps, drop rate 0 bps
      Match: any
      Traffic Shaping
           Target/Average Byte Sustain Excess Interval Increment
             Rate Limit bits/int bits/int (ms) (bytes)
            96000/96000 2400 9600 9600 100 1200

        Adapt Queue Packets Bytes Packets Bytes Shaping
        Active Depth Delayed Delayed Active
        - 0 389 417671 0 0 no

      Service-policy : rtp

        Class-map: rtp (match-all)
          0 packets, 0 bytes
          5 minute offered rate 0 bps, drop rate 0 bps
          Match: protocol rtp audio
          Queueing
            Strict Priority
            Output Queue: Conversation 24
            Bandwidth 32 (kbps) Burst 800 (Bytes)
            (pkts matched/bytes matched) 0/0
            (total drops/bytes drops) 0/0

        Class-map: class-default (match-any)
          468 packets, 418802 bytes
          5 minute offered rate 3000 bps, drop rate 0 bps
          Match: any

R3 config:

ip cef
!
 class-map match-all rtp
  match protocol rtp audio
!
!
 policy-map rtp
  class rtp
   priority 32
 policy-map shape-all
  class class-default
   shape average 96000 9600
   service-policy rtp
!
int ser 1/3
encap frame-relay
ip address 142.20.23.3 255.255.255.0
ip router isis
isis circuit-type level-2-only
isis authentication mode md5 level-2
isis authentication key-chain Isis-authen frame-relay map clns 200 broadcast
frame-relay map ip 142.20.23.2 200 broadcast service-policy output shape-all



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