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Cell Relay Retreat>MPLS WG Archive>month:2001-Jul> msg00528



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QoS in Shared Media

  • From: Fred Baker <fred@cisco.com>
  • Date: Mon, 30 Jul 2001 11:41:30 +0100
  • Cc: "Joel M. Halpern" <joel@longsys.com>, "'mpls@uu.net'" <mpls@UU.NET>, <te-wg@ops.ietf.org>

At 07:17 PM 7/30/2001, Juha Heinanen wrote:
>to me a device is diffserv capable if i can map a layer 3 or layer 2 "tos" 
>code point to
>a wfq and red drop precedence.  as my example showed, dpt/rpr doesn't have 
>this capability.

There is no requirement that a diffserv device implement WFQ. Hence, this 
is not fundamental.

In a system which drops no traffic, what does "drop preference" mean?

Yes, RPR does not internally implement WFQ or RED. It does offer the 
ability to differentiate among streams of traffic based on an attribute 
carried in the packet without having to perform obnoxious ACLs. Those are 
the only requirements I find in RFCs 2474/2475.