A New Internet-Draft is available from the on-line Internet-Drafts
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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-04.txt
Pages : 63
Date : 2006-10-25
This document describes a deployment model for pre-congestion
notification (PCN) operating in a large DiffServ-based region of the
Internet. PCN-based admission control protects the quality of service
of existing flows in normal circumstances, whilst if necessary (eg
after a large failure) pre-emption of some flows preserves the quality
of service of the remaining flows. Each link has a configured-
admission-rate and a configured-pre-emption-rate, and a router marks
packets that exceed these rates. Hence routers give an early warning of
their own potential congestion, before packets need to be dropped.
Gateways around the edges of the PCN-region convert measurements of
packet rates and their markings into decisions about whether to admit
new flows, and (if necessary) into the rate of excess traffic that
should be pre-empted. Per-flow admission states are kept at the
gateways only, while the PCN markers that are required for all routers
operate on the aggregate traffic - hence there is no scalability impact
on interior routers.
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