Browse Prior Art Database

A Time Sliding Window Three Colour Marker (TSWTCM) (RFC2859)

IP.com Disclosure Number: IPCOM000003458D
Original Publication Date: 2000-Jun-01
Included in the Prior Art Database: 2005-May-22
Document File: 10 page(s) / 19K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

W. Fang: AUTHOR [+3]

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 [RFC2475, RFC2474]. 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).

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 13% of the total text.

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
   [RFC2475, RFC2474].  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                      [Page 1]
RFC 2859                         TSWTCM                        June 2000


   The TSWTCM operates based on simple control theory principles of
   proportionally regulated feedback control.

2.0 Overview of TSWTCM

   The TSWTCM consists of two independent components: a rate estimator,
   and a marker to associate a colour (drop precede...