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A Two Rate Three Color Marker (RFC2698)

IP.com Disclosure Number: IPCOM000003291D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2019-Feb-11
Document File: 5 page(s) / 7K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Heinanen: AUTHOR [+1]

Related Documents

10.17487/RFC2698: DOI

Abstract

This document defines a Two Rate Three Color Marker (trTCM), which can be used as a component in a Diffserv traffic conditioner. This memo provides information for the Internet community.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 40% of the total text.

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 [RFC2475, RFC2474]. 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 [Page 1]

RFC 2698 A Two Rate Three Color Marker September 1999

The Meter meters each packet and passes the packet and the metering result to the Marker:

+------------+ | Result | | V +-------+ +--------+ | | | | Packet Stream ===>| Meter |===>| Marker |===> Marked Packet Stream | | | | +-------+ +--------+ The Meter operates in one of two modes. In the Color-Blind mode, the Meter assumes that the packet stream is uncolored. In the Color- Aware mode the Meter assumes that some preceding entity has pre- colored the incoming packet stream so that each packet is either green, yellow, or red. The details of the pre-coloring process, including handling of error scenarios, and how the Meter determines the color of a pre-colored packet are DS domain specific and outside the scope of this document.

The Marker (re)colors an IP packet according to the results of the Meter. The color is coded in the DS field [RFC2474] of the packet in a PHB specific manner (see section 4 for an example).

A companion document [RFC2697] describes another three color marker, called a Single Rate Three Color Maker (srTCM), where packets are marked based on a single rate and two burst sizes.

2. Configuration

The trTCM is configured by setting its mode and by assigning values to four traffic parameters: a Peak Information Rate (PIR) and its associated Peak Burst Size (PBS) and a Committed Information Rate (CIR) and its associated Committed Burst Size (CBS).

The PIR and CIR are measured in bytes of IP packets per second, i.e., it includ...

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