A PCN encoding using 2 DSCPs to provide 3 or more states

Document Type Expired Internet-Draft (pcn WG)
Authors Toby Moncaster  , Bob Briscoe  , Michael Menth 
Last updated 2015-10-14 (latest revision 2012-03-12)
Replaces draft-moncaster-pcn-3-state-encoding
Stream IETF
Intended RFC status Historic
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired (IESG: Dead)
Action Holders
Consensus Boilerplate Unknown
Telechat date
Responsible AD David Harrington
IESG note This document should not be published, per WG and IESG consensus.
See http://www.ietf.org/mail-archive/web/pcn/current/msg03113.html

The reason is that the WG reached consensus that 3-in-1 should be the only encoding going forward.
Publishing this draft would be confusing.
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Pre-congestion notification (PCN) is a mechanism designed to protect the Quality of Service of inelastic flows within a controlled domain. It does this by marking packets when traffic load on a link is approaching or has exceeded a threshold below the physical link rate. This experimental encoding scheme specifies how three encoding states can be carried in the IP header using a combination of two DSCPs and the ECN bits. The Basic scheme only allows for three encoding states. The Full scheme provides 6 states, enough for limited end- to-end support for ECN as well.


Toby Moncaster (toby@moncaster.com)
Bob Briscoe (bob.briscoe@bt.com)
Michael Menth (menth@informatik.uni-tuebingen.de)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)