Avaya Configuring IP, ARP, RARP, RIP, and OSPF Services Instrukcja Użytkownika Pobierz pdf (Strona 41)

IP Concepts, Terminology, and Features

308627-14.20 Rev 00

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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 1-6

, 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 1-6

, 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 import non-OSPF routes and to inject

this information into an OSPF AS. In Figure 1-6

, R1, R2, R7, R15, and R19

are boundary routers.

OSPF Implementation Notes

This section provides suggestions to help you configure your OSPF network. The

Nortel Networks implementation of OSPF does not restrict you to these

suggestions, but we provide them as guidelines.

• Use the same password throughout an area, or even throughout the entire

OSPF AS, if possible.

• Use the default timer values if possible. However, if you have any devices in

your network running OSPF, and you are now adding a Nortel Networks

router, ensure that the router’s OSPF interface timer values coincide with the

timer values on the other routers’ OSPF interfaces attached to the same

subnets.

• Use address ranges if your network is a subnetted network.

• Keep all subnets within one area.

• Make sure that the AS boundary router function is enabled if the router has

any non-OSPF route sources and if you want the router to propagate that

information into the OSPF domain.

• Every area border router must have a configured interface (physical or virtual)

to the backbone.

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Avaya Configuring IP, ARP, RARP, RIP, and OSPF Services Instrukcja Użytkownika Strona 41