RFC 2859 (rfc2859) - Page 1 of 9
A Time Sliding Window Three Colour Marker (TSWTCM)
Alternative Format: Original Text Document
Network Working Group W. Fang
Request for Comments: 2859 Princeton University
Category: Experimental N. Seddigh
B. Nandy
Nortel Networks
June 2000
A Time Sliding Window Three Colour Marker (TSWTCM)
Status of this Memo
This memo defines an Experimental Protocol for the Internet
community. It does not specify an Internet standard of any kind.
Discussion and suggestions for improvement are requested.
Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2000). All Rights Reserved.
Abstract
This memo defines a Time Sliding Window Three Colour Marker (TSWTCM),
which can be used as a component in a Diff-Serv traffic conditioner
[RFC 2475, RFC 2474]. The marker is intended to mark packets that will
be treated by the Assured Forwarding (AF) Per Hop Behaviour (PHB)
[AFPHB] in downstream routers. The TSWTCM meters a traffic stream and
marks packets to be either green, yellow or red based on the measured
throughput relative to two specified rates: Committed Target Rate
(CTR) and Peak Target Rate (PTR).
1.0 Introduction
The Time Sliding Window Three Colour Marker (TSWTCM) is designed to
mark packets of an IP traffic stream with colour of red, yellow or
green. The marking is performed based on the measured throughput of
the traffic stream as compared against the Committed Target Rate
(CTR) and the Peak Target Rate (PTR). The TSWTCM is designed to mark
packets contributing to sending rate below or equal to the CTR with
green colour. Packets contributing to the portion of the rate
between the CTR and PTR are marked yellow. Packets causing the rate
to exceed PTR are marked with red colour.
The TSWTCM has been primarily designed for traffic streams that will
be forwarded based on the AF PHB in core routers.
Fang, et al. Experimental
