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1-1
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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