Avaya Configuring IP Services Manual de usuario descargar pdf (Pagina 161)

Configuring OSPF Services

4-23

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

OSPF AS, if possible.

• Use the default timers, unless you are running 9.6-KB sync lines. In this case,

double the default timers on both ends of the link.

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

• Keep all subnets within one area. If you cross areas, you cannot conﬁgure

summaries.

• Make sure the AS Border Router parameter is enabled if the router has any

non-OSPF interfaces, and if you want that information propagated.

• You must conﬁgure virtual links for each area border router that does not

reside within or directly interface to the backbone. Every area border router

must have a conﬁgured path to the backbone. See “Conﬁguring OSPF Virtual

Interfaces” on page 4-59.

• Rather than just a hop count, OSPF considers the cost of a path when

choosing the best path. Each interface, however, is assigned the default cost 1

for the path to which it interfaces. If you have a preferred path, you must edit

the Metric Cost parameter for your interfaces. You will need to assign a higher

metric cost for those paths which are

not

preferred paths. See “Editing OSPF

Interface Parameters” on page 4-26.

• If you have any devices in your network running OSPF, and are now adding a

Bay Networks router, you must make sure that the router’s timer values

coincide with the timers in your other devices. Determine the timer values of

the other devices, and change the router’s timer values to match them. See

“Editing OSPF Interface Parameters” on page 4-26.

• If there is a topology change (for example, if you add an area, combine two

areas, move routers, and so on), you must reconﬁgure the appropriate OSPF

elements (OSPF area ranges/interfaces/neighbors/virtual links, and so on).

Editing OSPF Parameters

This section describes how to edit OSPF parameters for IP interfaces and the

OSPF soloist.

For each OSPF parameter, this chapter provides information about default

settings, valid parameter options, the parameter function, instructions for setting

the parameter, and the Management Information Base (MIB) object ID.

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Avaya Configuring IP Services Manual de usuario Pagina 161