
308628-14.00 Rev 00
1-1
Chapter 1
Exterior Gateway Protocols (BGP/EGP)
The following topics introduce concepts and terminology used in this guide:
What Gateway Protocols Do
LANs and WANs interconnected by IP routers form a group of networks called an
internet. For administrative purposes, an internet is divided into routing domains
called autonomous systems. An autonomous system (AS) is simply a collection of
routers (called gateways in IP terminology) and hosts. Each autonomous system
has its own unique AS number assigned by the appropriate Network Information
Center entity. Figure 1-1
depicts a sample internet segmented into three
autonomous systems.
Topic Page
What Gateway Protocols Do
1-1
Border Gateway Protocol (BGP) 1-3
Exterior Gateway Protocol (EGP) 1-3
Classless Interdomain Routing 1-4
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