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OSPF Neighbor Relationships
Certain parameters within the OSPF Hellos must also match for two routersto become neighbors. They include
■ Hello/dead timers■ Area ID■ Authentication type and password■ Stub area flag
OSPF routers send out periodic multicast packets to introduce themselves toother routers on a link. They become neighbors when they see their ownrouter ID included in the Neighbor field of the Hello from another router.Seeing this tells each router that they have bidirectional communication. Inaddition, two routers must be on a common subnet for a neighbor relationshipto be formed. (Virtual links are sometimes an exception to this rule.)
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