Avaya Configuring IP, ARP, RIP, and OSPF Services Manual de usuario descargar pdf (Pagina 39)

IP Concepts, Terminology, and Features

117356-E Rev 00

1-17

OSPF Router Types

OSPF defines the following router types:

• Internal router. A router with interfaces to networks in one area only. Internal

routers flood each area with complete routing information about changes that

occur within the area. In Figure 1-5

, R4, R5, and R6 in area 0.0.0.1 are

internal routers.

• Border router. A router with an interface to the backbone network and

interfaces to one or more additional areas. Each border router connects one or

more areas to the backbone. In Figure 1-5

, R3, R8, R11, and R16 are border

routers. Using the backbone, border routers ensure that AS external (ASE)

routes and summaries of routing information for all areas are distributed

throughout the AS.

• Boundary router. A router configured to learn AS external routes and to inject

this information into an OSPF AS. In Figure 1-5

, R1, R2, R7, R15, and R19

are boundary routers.

AS External Routes

OSPF considers the following routes to be AS external (ASE) routes:

• A route to a destination outside the AS

• A static route

• A default route

• A route derived by RIP

• A directly connected network not running OSPF

In Figure 1-5

, for example, routers R1 and R2 are boundary routers that use BGP

and EGP to connect the backbone to external ASs. R7 in area 0.0.0.1 and R15 in

area 0.0.0.3 are also boundary routers that use RIP to connect to external ASs.

R19 in area 0.0.0.4 connects the area to an external AS via BGP.

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Avaya Configuring IP, ARP, RIP, and OSPF Services Manual de usuario Pagina 39