Avaya Configuring IP Services Manual do Utilizador descarregar pdf (Página 147)

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101

Configuring OSPF Services

4-9

Figure 4-3, for example, provides a closer view of router R4, an internal router in

Area A in Figure 4-2. R4 has six interfaces to Area A networks: A, B, C, D, E, and

F. On interface F, the router has established an adjacency with internal router R5.

On interface D, the router has established an adjacency with internal router R6.

On interface B, the router has established an adjacency with border router R3.

If the state of one of its interfaces changes (for example, if interface A fails),

router R4 generates an internal link-state advertisement and ﬂoods it to adjacent

routers.

Periodically, R4 receives internal and external state information from adjacent

router R5. When this occurs, R4 updates its routing table and ﬂoods the

information to adjacent routers.

By ﬂooding all internal and external change information to adjacent routers,

internal routers ensure that every router in the area has the same routing table for

that area. (In OSPF terminology, this process is called

synchronizing area

databases

.) For information about adjacent routers, see “Establishing

Adjacencies” on page 4-6.

Figure 4-3. Internal Area Router

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