Avaya Configuring IP Services Uživatelský manuál stáhnout pdf (Strana 148)

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101

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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