Re: Frame relay traffic shaping ?

From: Jim Nguyen (nhatquang@thiennam.org)
Date: Tue Apr 12 2005 - 07:36:22 GMT-3

hi, the logic here is that we want to get the Be in bit ( a token bucket with
Be bits) but Tc is in millisecond, so we have to convert Tc to second
as in the formular Be ( bit) = (48Kbps - 32Kbps) * 125ms / 1000 = 2000 bits.

  ----- Original Message -----
  From: James Yeo
  To: Lee Donald ; simon hart ; ccielab@groupstudy.com
  Sent: Tuesday, April 12, 2005 4:44 PM
  Subject: RE: Frame relay traffic shaping ?

  You divide by 1/8 = 16000/8=2000

  -----Original Message-----
  From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
  Lee Donald
  Sent: Tuesday, April 12, 2005 9:49 AM
  To: simon hart; Lee Donald; ccielab@groupstudy.com
  Subject: RE: Frame relay traffic shaping ?

  Simon,

  160000 ( 16k) divided by 125 = 1280 ? How do you get 2000 ?

  Regards

  Lee.

  -----Original Message-----
  From: simon hart [mailto:simon.hart@btinternet.com]
  Sent: 11 April 2005 21:53
  To: Lee Donald; ccielab@groupstudy.com
  Subject: RE: Frame relay traffic shaping ?

  Hi Lee,

  I guess from you question you know how to determine bc, then be is a
  fairly
  simple step.
  However you need to know what the Tc is for the shaped rate. This could
  be
  explicitly defined or you maybe asked to use the default value.
  If asked to use the default value then apply a map-class to the frame
  port
  with just the cir configured and enable traffic shaping.

  Then go to show traffic shaping, you will now see what the Tc value is.
  For
  a cir of 32k you should find that this defaults to 125ms.

  Therefore bc = cir*tc = 4000 bits

  Now you wish to add a burst up to 48k

  48k burst minus 32k cir = 16k

  Therefore be = 16k/125ms = 2000

  Your be value is 2000 and your bc value is 4000

  HTH

  Simon

  -----Original Message-----
  From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
  Lee Donald
  Sent: 11 April 2005 21:28
  To: ccielab@groupstudy.com
  Subject: Frame relay traffic shaping ?

  Hi,
  Can anyone give me some pointers on frame-relay traffic shaping.
  Specifically cir, bc, be.

  I know roughly the cir and bc values when asked to configure parameters
  but
  it is calculating the be that I can't get my head around.

  For instance, I have a pvc that has a cir of 32k, the router is allowed
  to
  burst up to 75% of the AR 64k. I know that is 48k but what should the
  "be"
  value be and how do I work it out?

  Thanks in advance.

  Regards

  Lee.

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