Three State PCN Marking

Document Type Expired Internet-Draft (individual)
Authors Jozef Babiarz  , Xiao-Gao Liu  , Kwok Chan  , Michael Menth 
Last updated 2007-11-18
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document proposes a mechanism for admission control and flow termination. It is based on the concept of pre-congestion notification (PCN) using three different codepoints: "no pre- congestion", "admission-stop", and "excess-traffic" for packet marking. Therefore, the proposal is called three state marking (3sm). The behaviour of edge nodes is presented which distinguishes from other proposals through little complexity and its ability to cope with multipath routing. Algorithms required for packet metering and marking are explained in detail.


Jozef Babiarz (
Xiao-Gao Liu (
Kwok Chan (
Michael Menth (

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