OSPF Adjecencies

The following elements are key for OSPF enabled routers to create adjacencies with their peers:

IP Connectivity
Same area ID
Timers (hello and dead intervals)
MTU
Authentication Key if used
Stub Area Flag

Link:

http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094e9e.shtml

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