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BGP-4 Protocol Document Roadmap and Implementation Experience (RFC1656)

IP.com Disclosure Number: IPCOM000002492D
Original Publication Date: 1994-Jul-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 4 page(s) / 7K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

P. Traina: AUTHOR

Abstract

Border Gateway Protocol v4 (BGP-4) [1] is an inter-Autonomous System routing protocol. It is built on experience gained with BGP as defined in RFC-1267 [2] and BGP usage in the connected Internet as described in RFC-1268 [3].

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 38% of the total text.

Network Working Group P. Traina

Request for Comments: 1656 cisco Systems

Category: Informational July 1994

BGP-4 Protocol Document Roadmap and Implementation Experience

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.

Introduction

Border Gateway Protocol v4 (BGP-4) [1] is an inter-Autonomous System

routing protocol. It is built on experience gained with BGP as

defined in RFC-1267 [2] and BGP usage in the connected Internet as

described in RFC-1268 [3].

The primary function of a BGP speaking system is to exchange network

reachability information with other BGP systems. This network

reachability information includes information on the list of

Autonomous Systems (ASs) that reachability information traverses.

This information is sufficient to construct a graph of AS

connectivity from which routing loops may be pruned and some policy

decisions at the AS level may be enforced.

BGP-4 provides a new set of mechanisms for supporting classless

inter-domain routing. These mechanisms include support for

advertising an IP prefix and eliminates the concept of network

"class" within BGP. BGP-4 also introduces mechanisms which allow

aggregation of routes, including aggregation of AS paths. These

changes provide support for the proposed supernetting scheme [4].

The management information base has been defined [5] and security

considerations are discussed in the protocol definition document [1].

Applicability Statement for BGP-4

BGP-4 is explicitly designed for carrying reachability information

between Autonomous Systems. BGP-4 is not intended to replace

interior gateway protocols such as OSPF [7] or RIP [6].

Implementations

Four vendors have developed independent implementations at the time

of this memo:

ANS (gated)

Europanet

3COM

cisco

The complete interoperability matrix between all known

implementations of various versions of BGP is available under

separate cover [9].

Implementation Testing

One implementation has been extensively tested in a network designed

to mirror the complex connectivity present at many major Internet

borders. This network consists of multiple BGP-3 and BGP-4 speakers

carrying full routing information injected from Alternet, EBone,

Sprint, CERFnet, and cisco. In many cases additional AS adjacencies

are simulated via the use of...