RFC 2697 (rfc2697) - Page 1 of 6

A Single Rate Three Color Marker

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Network Working Group                                        J. Heinanen
Request for Comments: 2697                                 Telia Finland
Category: Informational                                        R. Guerin
                                              University of Pennsylvania
                                                          September 1999


                    A Single Rate Three Color Marker

Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (1999).  All Rights Reserved.

Abstract

   This document defines a Single Rate Three Color Marker (srTCM), which
   can be used as component in a Diffserv traffic conditioner [RFC 2475,
   RFC 2474].  The srTCM meters a traffic stream and marks its packets
   according to three traffic parameters, Committed Information Rate
   (CIR), Committed Burst Size (CBS), and Excess Burst Size (EBS), to be
   either green, yellow, or red.  A packet is marked green if it doesn't
   exceed the CBS, yellow if it does exceed the CBS, but not the EBS,
   and red otherwise.

1. Introduction

   The Single Rate Three Color Marker (srTCM) meters an IP packet stream
   and marks its packets either green, yellow, or red.  Marking is based
   on a Committed Information Rate (CIR) and two associated burst sizes,
   a Committed Burst Size (CBS) and an Excess Burst Size (EBS).  A
   packet is marked green if it doesn't exceed the CBS, yellow if it
   does exceed the CBS, but not the EBS, and red otherwise.  The srTCM
   is useful, for example, for ingress policing of a service, where only
   the length, not the peak rate, of the burst determines service
   eligibility.










Heinanen & Guerin            Informational
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