
Configuring IP Services
4-10
Configuring a Border Router
Each area is connected to the backbone by one or more border routers. In
Figure 4-2, for example, R3 is a border router connecting Area A to the backbone.
A border router can have connections to multiple areas. In Figure 4-4, for
example, BR 2 has an interface to a network in Area B and an interface to a
network in Area C.
Figure 4-4. Area Border Router
Each border router in an AS
• Receives routing information from its attached areas, creates summaries of
this information, and forwards the summaries to the backbone and to any
other attached area. In Figure 4-4, for example, BR2 floods summaries from
Area B to the backbone and Area C. Through the backbone, the summaries
are forwarded to all other areas in the AS.
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