Re: [Diffserv-interest] CIR in AF class

Brian E Carpenter <brc@zurich.ibm.com> Wed, 12 May 2004 17:05 UTC

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Date: Wed, 12 May 2004 18:27:01 +0200
From: Brian E Carpenter <brc@zurich.ibm.com>
Organization: IBM
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Yang,

If different entry points to a diffserv domain apply different
admission control rules then traffic entering at those points will
get different shares of the bandwidth at the entry point, but once the
traffic gets mixed up in the core of the domain, all traffic sources
will be getting the same treatment. In other words any CIR differentiation
at the entry points will vanish in the core.

(That's assuming an IP network of course... MPLS is a different story).

     Brian

Feng Y wrote:
 >>>Also, CIR treatment at the edge can be very
 >>>different.
 >>
 >>What do you means by "different"? implementation
 >>details or the traffic shaping/policing policy?
 >>
 >>To my understanding the same PHB reflects the same
 >>view of traffic across a policing point although there
 >>may exist great differnce in implementation methods.
 >>
 >
 >
 > Do you mean that although the implementations are
 > different, the results are the same - defferent flows have
 > same CIR? Or, the flows which have the same CIR maybe
 > assigned different bandwidth according to the current
 > network state?
 >
 > Thanks.
 >
 > Yang
 >

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