From: Dave Gingrich (Dave@xxxxxxx)
Date: Sun Feb 04 2001 - 11:34:16 GMT-3
At 23:45 2/4/2001 +1300, Justin Menga wrote:
>In Frame Relay networks you have a CIR and a PIR (Peak Information Rate -
>often called Excess Information Rate). The service providers typically
>guarantee you your CIR, but will let you burst to PIR (except frames are
>marked DE).
>
>The formulae for PIR and CIR are:
>
>PIR = (Bc + Be)/Tc
>CIR = Bc/Tc
>where Tc is the sampling interval.
>
>Assume Tc = 1, and you have a CIR of 32Kbps and PIR of 64Kbps. Therefore Bc
>= 32K, and Be is 32K.
I believe this is incorrect.
Be and Bc are "bits in the sampling interval (125 ms)", not per second.
Therefore in your example, Bc and Be are both 4000, not 32000. The FRTS
values of CIR and MINCIR are per second.
Depending upon the behavior you want to create, the other values may be
wrong too. Here's the doc that worked for me
http://www.cisco.com/warp/customer/125/21.shtml
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Dave Gingrich, K9DC
Indianapolis, Indiana
Dave@dcg.org - CCIE 6748
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