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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 Internet Engineering Task Force (IETF)
Intended RFC status Historic
Expired & archived
Stream WG state WG Document
Document shepherd (None)
IESG IESG state Expired (IESG: Dead)
Action Holders
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD David Harrington
IESG note This document should not be published, per WG and IESG consensus.

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This Internet-Draft is no longer active.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 is available in these formats:


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
Bob Briscoe
Michael Menth

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