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RFC 6627
Title: Overview of Pre-Congestion Notification Encoding
Author: G. Karagiannis, K. Chan,
T. Moncaster, M. Menth,
P. Eardley, B. Briscoe
Status: Informational
Stream: IETF
Date: July 2012
Mailbox: g.karagiannis@utwente.nl,
khchan.work@gmail.com,
Toby.Moncaster@cl.cam.ac.uk,
menth@informatik.uni-tuebingen.de,
philip.eardley@bt.com,
bob.briscoe@bt.com
Pages: 20
Characters: 47274
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-pcn-encoding-comparison-09.txt
URL: http://www.rfc-editor.org/rfc/rfc6627.txt
The objective of Pre-Congestion Notification (PCN) is to protect
the quality of service (QoS) of inelastic flows within a Diffserv
domain. On every link in the PCN-domain, the overall rate of
PCN-traffic is metered, and PCN-packets are appropriately marked when
certain configured rates are exceeded. Egress nodes provide decision
points with information about the PCN-marks of PCN-packets that allows them
to take decisions about whether to admit or block a new flow request,
and to terminate some already admitted flows during serious pre-congestion.
The PCN working group explored a number of approaches for encoding
this pre-congestion information into the IP header. This document provides
details of those approaches along with an explanation of the constraints
that apply to any solution. This document is not an Internet Standards
Track specification; it is published for informational purposes.
This document is a product of the Congestion and Pre-Congestion Notification Working Group of the IETF.
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