
Configuring IP Exterior Gateway Protocols (BGP and EGP)
1-2
308628-15.0 Rev 00
Figure 1-1. Internetwork Segmented into Three Autonomous Systems
The routers at the edges (or borders) of autonomous systems are called gateways.
These gateways use exterior gateway protocols to exchange reachability
information and to route packets between routing domains.
Router
5
Router
6
Router
7
Router
8
Router
9
Router
1
Router
2
Router
3
Router
4
Autonomous
system 3
Autonomous
system 2
Autonomous
system 1
LAN
A
LAN
B
LAN
D
LAN
E
LAN
G
LAN
F
LAN
C
IP0006B
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