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Version 5.13.0, 2015-03-25
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PCN Encoding for Packet-Specific Dual Marking (PSDM Encoding)

This Internet-Draft is no longer active.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


Pre-congestion notification (PCN) is a link-specific and load- dependent packet re-marking mechanism and provides in Differentiated Services networks feedback to egress nodes about load conditions within the domain. It is used to support admission control and flow termination decision in a simple way. This document proposes how PCN marks can be encoded into the IP header for packet-specific dual marking (PSDM). PSDM encoding provides three different codepoints: not-ETM, not-ThM, and PM. Excess-traffic-marking may re-mark not- ETM-packets to PM and threshold-marking may re-mark not-ThM-packets to PM.


Michael Menth <>
Jozef Babiarz <>
Toby Moncaster <>
Bob Briscoe <>

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