I-D ACTION:draft-briscoe-tsvwg-cl-architecture-03.txt

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	Title		: An edge-to-edge Deployment Model for Pre-
                          Congestion Notification: Admission Control over a DiffServ Region
	Author(s)	: B. Briscoe, et al.
	Filename	: draft-briscoe-tsvwg-cl-architecture-03.txt
	Pages		: 62
	Date		: 2006-6-28
	
This document describes a deployment model for pre-congestion 
notification (PCN). PCN-based flow admission control and if necessary 
flow pre-emption preserve the Controlled Load service to admitted 
flows. Routers in a large DiffServ-based region of the Internet use 
new pre-congestion notification marking to give early warning of 
their own congestion. Gateways around the edges of the region convert 
measurements of this packet granularity marking into admission 
control and pre-emption functions at flow granularity. Note that 
interior routers of the DiffServ-based region do not require flow 
state or signalling - they only have to do the bulk packet marking of 
PCN. Hence an end-to-end Controlled Load service can be achieved 
without any scalability impact on interior routers.

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