RE: Shape average and shape peak

From: Vincent Mashburn (vmashburn@fedex.com)
Date: Tue Oct 24 2006 - 10:30:20 ART


This is a common question. To answer the question, refer back to the
formula: CIR = bc/tc.

For shape peak, bc + be is sent every interval, but the formula is still
CIR = bc / tc. For shape average, bc is sent every interval, and the
formula is still CIR = bc / tc.

So, say you have a CIR of 64000, bc = 8000 and be = 16000.
Using shape average:

64000 = 8000 / tc ==> tc = 125ms.

Using shape peak:

64000 = 8000 / tc ==> tc = 125ms

Using shape average by setting bc = bc + be

64000 = 24000 / tc ==> tc = 375ms.

So, as you can see, it is different.
Hope this helps.

Vince Mashburn
Voice / Data Engineer
901-263-5072
CCVP, CCNP, CCDA,Network +
Cisco IP Telephony Support Specialist
Cisco IP Telephony Operations Specialist

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Cagri Yucel
Sent: Tuesday, October 24, 2006 4:49 AM
To: Group study
Subject: Shape average and shape peak

I am sure I am missing a bit here but on the Cisco Doc it says

shape average sends Bc bits in each interval
shape peak sends Bc+Be bits in each interval

So what's the point of having a different command ? Isn't it the same
thing
if I set shape average with a Bc equal to Bc+Be of shape peak ?

Thanks

-- 
-cagri


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