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Customizing OSPF Services

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OSPF Implementation Notes

This section provides some suggestions to help you configure your OSPF

network. The Bay Networks OSPF implementation does not restrict you to these

suggestions, but we provide them as guidelines.

• 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 synchronous 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 Boundary Router function 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.

• 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 that are not preferred paths.

• 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.

• If you change the topology (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).

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