Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manuel d'utilisateur télécharger pdf (Page 23)

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Chapter 1

Exterior Gateway Protocols (BGP and EGP)

This chapter introduces the concepts and terminology used in this guide.

Autonomous Systems and Gateway Protocols

LANs and WANs interconnected by IP routers form a group of networks called an

internetwork. For administrative purposes, an internetwork is divided into

autonomous systems. An autonomous system (AS) is a group of routers (called

gateways in IP terminology) and hosts run by a single technical administrator that

has a single, clearly defined routing policy. Each autonomous system has its own

unique AS number assigned by the appropriate Internet Registry entity. Figure 1-1

shows a sample internetwork segmented into three autonomous systems.

Topic Page

Autonomous Systems and Gateway Protocols 1-1

BGP Concepts and Terminology 1-4

BGP Implementation Notes 1-12

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Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manuel d'utilisateur Page 23