Browse Prior Art Database

An Expedited Forwarding PHB (Per-Hop Behavior) (RFC3246)

IP.com Disclosure Number: IPCOM000007370D
Original Publication Date: 2002-Mar-01
Included in the Prior Art Database: 2002-Mar-20
Document File: 17 page(s) / 34K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

B. Davie: AUTHOR [+9]

Abstract

This document defines a PHB (per-hop behavior) called Expedited Forwarding (EF). The PHB is a basic building block in the Differentiated Services architecture. EF is intended to provide a building block for low delay, low jitter and low loss services by ensuring that the EF aggregate is served at a certain configured rate. This document obsoletes RFC 2598.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 10% of the total text.

Network Working Group                                           B. Davie

Request for Comments: 3246                                     A. Charny

Obsoletes: 2598                                      Cisco Systems, Inc.

Category: Standards Track                                 J.C.R. Bennett

                                                                Motorola

                                                               K. Benson

                                                                 Tellabs

                                                          J.Y. Le Boudec

                                                                    EPFL

                                                             W. Courtney

                                                                     TRW

                                                               S. Davari

                                                              PMC-Sierra

                                                               V. Firoiu

                                                         Nortel Networks

                                                            D. Stiliadis

                                                     Lucent Technologies

                                                              March 2002

             An Expedited Forwarding PHB (Per-Hop Behavior)

Status of this Memo

   This document specifies an Internet standards track protocol for the

   Internet community, and requests discussion and suggestions for

   improvements.  Please refer to the current edition of the "Internet

   Official Protocol Standards" (STD 1) for the standardization state

   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2001).  All Rights Reserved.

Abstract

   This document defines a PHB (per-hop behavior) called Expedited

   Forwarding (EF).  The PHB is a basic building block in the

   Differentiated Services architecture.  EF is intended to provide a

   building block for low delay, low jitter and low loss services by

   ensuring that the EF aggregate is served at a certain configured

   rate.  This document obsoletes RFC 2598.

Davie, et. al.              Standards Track                     [Page 1]

RFC 3246              An Expedited Forwarding PHB             March 2002

Table of Contents

   1      Introduction  ...........................................   2

   1.1    Relationship to RFC 2598  ...............................   3

   2      Definition of EF PHB  ...................................   3

   2.1    Intuitive Description of EF  ............................   3

   2.2    Formal Definition of the EF PHB  ........................   5

   2.3    Figures of merit  .......................................   8

   2.4    Delay and jitter  .......................................   8

   2.5    Loss  ...................................................   9

   2.6    Microflow misordering  ..................................   9

   2.7    Recommended codepoint for this PHB  .....................   9

   2.8    Mutability  .............................................  10

   2.9    Tunneling  ..............................................  10

   2.10   Interaction with other PHBs  ............................  10

   3      Security Considerations  ................................  10

   4      IANA Considerations  ....................................  11

   5      Acknowledgments  ........................................  11

   6      References  .............................................  11

   Appendix: Implementation Examples ..............................  12

   Authors' Addresses .............................................  14

   Full Copyright Statement .......................................  16

1. Introduction

   Network nodes that implement the differentiated services enhancements

   to IP use a codepoint in the IP header to select a per-hop behavior

   (PHB) as the specific forwarding treatment for that packet [3, 4].

   This memo describes a particular PHB called expedited forwarding

   (EF).

   The intent of the EF PHB is to provide a building block for low loss,

   low delay, and low jitter services.  The details of exactly how to

   build such services are outside the scop...