RFC 2698 (rfc2698) - Page 1 of 5

A Two Rate Three Color Marker

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Network Working Group                                        J. Heinanen
Request for Comments: 2698                                 Telia Finland
Category: Informational                                        R. Guerin
                                              University of Pennsylvania
                                                          September 1999


                     A Two 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 Two Rate Three Color Marker (trTCM), which
   can be used as a component in a Diffserv traffic conditioner
   [RFC 2475, RFC 2474].  The trTCM meters an IP packet stream and marks
   its packets based on two rates, Peak Information Rate (PIR) and
   Committed Information Rate (CIR), and their associated burst sizes to
   be either green, yellow, or red.  A packet is marked red if it
   exceeds the PIR.  Otherwise it is marked either yellow or green
   depending on whether it exceeds or doesn't exceed the CIR.

1. Introduction

   The Two Rate Three Color Marker (trTCM) meters an IP packet stream
   and marks its packets either green, yellow, or red.  A packet is
   marked red if it exceeds the Peak Information Rate (PIR).  Otherwise
   it is marked either yellow or green depending on whether it exceeds
   or doesn't exceed the Committed Information Rate (CIR).  The trTCM is
   useful, for example, for ingress policing of a service, where a peak
   rate needs to be enforced separately from a committed rate.












Heinanen & Guerin            Informational
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