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Source Demand Routing: Packet Format and Forwarding Specification (Version 1) (RFC1940)

IP.com Disclosure Number: IPCOM000004172D
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 22 page(s) / 57K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Estrin: AUTHOR [+5]

Abstract

Status of this Memo

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 5% of the total text.

Network Working Group D. Estrin

Request for Comments: 1940 USC

Category: Informational T. Li

Y. Rekhter

cisco Systems

K. Varadhan

D. Zappala

USC

May 1996

Source Demand Routing:

Packet Format and Forwarding Specification (Version 1).

Status of this Memo

This memo provides information for the Internet community. This memo

does not specify an Internet standard of any kind. Distribution of

this memo is unlimited.

1. Overview

The purpose of SDRP is to support source-initiated selection of

routes to complement the route selection provided by existing routing

protocols for both inter-domain and intra-domain routes. This

document refers to such source-initiated routes as "SDRP routes".

This document describes the packet format and forwarding procedure

for SDRP. It also describes procedures for ascertaining feasibility

of SDRP routes. Other components not described here are routing

information distribution and route computation. This portion of the

protocol may initially be used with manually configured routes. The

same packet format and processing will be usable with dynamic route

information distribution and computation methods under development.

The packet forwarding protocol specified here makes minimal

assumptions about the distribution and acquisition of routing

information needed to construct the SDRP routes. These minimal

assumptions are believed to be sufficient for the existing Internet.

Future components of the SDRP protocol will extend capabilities in

this area and others in a largely backward-compatible manner.

This version of the packet forwarding protocol sends all packets with

the complete SDRP route in the SDRP header. Future versions will

address route setup and other enhancements and optimizations.

2. Model of operations

An Internet can be viewed as a collection of routing domains

interconnected by means of common subnetworks, and Border Routers

(BRs) attached to these subnetworks. A routing domain itself may be

composed of further subnetworks, routers interconnecting these

subnetworks, and hosts. This document assumes that there is some

type of routing present within the routing domain, but it does not

assume that this intra-domain routing is coordinated or even

consistent.

For the purposes of this discussion, a BR belongs to only one domain.

A pair of BRs, each belonging to a different domain, but attached to

a common subnetwork, form an inter-d...