From: Joe Chang (changjoe@earthlink.net)
Date: Fri Jan 31 2003 - 21:59:35 GMT-3
Hi Joe,
To answer your question, you've got to also ask: what is the difference
between VBR-rt and nrt? Cisco is somewhat vague about this point so I had to
do a google search. Lots and lots of good info on ATM out there. The answer
seems to be this: VBR-rt and VBR-nrt is the almost the same algorithm, but
VBR-rt guarantees a minimum end-to-end delay (in ATM vocabulary, cell
transer delay) PCR, SCR, and MBS seem to be the same traffic shaping
variables between the two services. But for VBR-nrt, since cell delay is not
guaranteed by the network, traffic shaping works only for output traffic
(which I guess means ATM traffic shaping can work for both input and output
under VBR-rt, unlike FR)
----- Original Message -----
From: "Joe Martin" <jmartin@capitalpremium.net>
To: "CCIE GroupStudy" <ccielab@groupstudy.com>
Sent: Friday, January 31, 2003 12:23 AM
Subject: ATM traffic shaping
> Guys & Gals,
> Looking for some ATM/QOS gurus!
>
> When configuring ATM traffic shaping, VBR-rt has a higher priority than
> VBR-nrt. What is the difference, if any, between the SCR (Sustainable
Cell
> Rate) in VBR-nrt and ACR (Average Cell Rate) in VBR-rt?
>
> For both, am I not basically configuring a Max, Average, and Burst cell
> rate?
>
> TIA,
>
> Joe Martin
> .
.
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