Avaya Configuring IP, ARP, RIP, and OSPF Services Instrukcja Użytkownika Pobierz pdf (Strona 40)

Configuring IP, ARP, RIP, and OSPF Services

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117356-E Rev 00

OSPF Implementation Notes

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

Bay 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, unless you are running 9.6 KB synchronous

lines. In this case, double the default timer values 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 the router to propagate that information.

• 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.

• OSPF considers the cost of a path, not just the hop count, 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 change the

metric cost for your interfaces. Assign a higher metric cost for those paths that

are not preferred paths.

• If you have any devices in your network running OSPF, and you 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, or move routers), you must reconfigure the appropriate OSPF elements

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

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Avaya Configuring IP, ARP, RIP, and OSPF Services Instrukcja Użytkownika Strona 40