From: Joe Chang (changjoe@earthlink.net)
Date: Mon Feb 24 2003 - 11:50:18 GMT-3
I posted this reply a while ago and since found out that I'm mistaken in my
description of VBR-nrt. On SVCs, VBR-nrt allows an endpoint to specify its
input parameters, a feature not available for PVCs or VBR-rt. This has
nothing to do with CTD, just that SVCs allows signalling and negotiation of
service parameters.
Also, I noticed that on the 12.2 CD, the vbr-rt command is missing. Anyone
know why?
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fwan
_r/atmcmds/wrfshatm.htm
----- Original Message -----
From: "Joe Chang" <changjoe@earthlink.net>
To: "Joe Martin" <jmartin@capitalpremium.net>; "CCIE GroupStudy"
<ccielab@groupstudy.com>
Sent: Friday, January 31, 2003 8:59 PM
Subject: Re: ATM traffic shaping
> 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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