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QoS Routing Mechanisms and OSPF Extensions (RFC2676)

IP.com Disclosure Number: IPCOM000003267D
Original Publication Date: 1999-Aug-01
Included in the Prior Art Database: 2000-Sep-13

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Apostolopoulos: AUTHOR [+6]

Abstract

This memo describes extensions to the OSPF [Moy98] protocol to support QoS routes. The focus of this document is on the algorithms used to compute QoS routes and on the necessary modifications to OSPF to support this function, e.g., the information needed, its format, how it is distributed, and how it is used by the QoS path selection process. Aspects related to how QoS routes are established and managed are also briefly discussed. The goal of this document is to identify a framework and possible approaches to allow deployment of QoS routing capabilities with the minimum possible impact to the existing routing infrastructure.

This text was extracted from a ASCII Text document.
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Network Working Group G. Apostolopoulos

Request for Comments: 2676 D. Williams

Category: Experimental IBM

S. Kamat

Lucent

R. Guerin

UPenn

A. Orda

Technion

T. Przygienda

Siara Systems

August 1999

QoS Routing Mechanisms and OSPF Extensions

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 (1999). All Rights Reserved.

Abstract

This memo describes extensions to the OSPF [Moy98] protocol to

support QoS routes. The focus of this document is on the algorithms

used to compute QoS routes and on the necessary modifications to OSPF

to support this function, e.g., the information needed, its format,

how it is distributed, and how it is used by the QoS path selection

process. Aspects related to how QoS routes are established and

managed are also briefly discussed. The goal of this document is to

identify a framework and possible approaches to allow deployment of

QoS routing capabilities with the minimum possible impact to the

existing routing infrastructure.

In addition, experience from an implementation of the proposed

extensions in the GateD environment [Con], along with performance

measurements is presented.

Table of Contents

1. Introduction 3

1.1. Overall Framework . . . . . . . . . . . . . . . . . . . . 3

1.2. Simplifying Assumptions . . . . . . . . . . . . . . . . . 5

2. Path Selection Information and Algorithms 7

2.1. Metrics . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2. Advertisement of Link State Information . . . . . . . . . 8

2.3. Path Selection . . . . . . . . . . . . . . . . . . . . .10

2.3.1. Path Computation Algorithm . . . . . . . . . . .11

3. OSPF Protocol Extensions 16

3.1. QoS -- Optional Capabilities . . . . . . . . . . . . . .17

3.2. Encoding Resources as Extended TOS . . . . . . . . . . .17

3.2.1. Encoding bandwidth resource . . . . . . . . . . .19

3.2.2. Encoding Delay . . . . . . ....