
Configuring IP Services
8-2
303528-A Rev 00
BGP Concepts and Terminology
BGP is an exterior gateway protocol designed to exchange network reachability
information with other BGP systems in other autonomous systems.
Figure 8-1
shows two autonomous systems: AS1 and AS2. Networks within AS1
and AS2 are connected by routers running an interior gateway protocol -- in this
case, OSPF. The two ASs are connected by routers that run an exterior gateway
protocol -- BGP -- in addition to OSPF.
Figure 8-1. BGP Connecting Autonomous Systems Running OSPF
OSPF/
BGP
OSPF/
BGP
OSPF
OSPF
OSPF
BGP
connection
AS1
AS2
OSPF
OSPF
IP00025A
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