OSPF Neighbor States

OSPF Neighbor States

Down

Attempt  / send hello

Init     / received hello (check hello/dead timers, netmasks, AREA ID, Auth)

Two Way  / hellos received by both neighbors – reset dead timer and wait for another hello. repeat (The only exception to this is the 2-way state, which is normal in a broadcast network. Routers achieve the full state with their DR and BDR only. Neighbors always see each other as 2-way)

Exstart  / Master(higher priority) and slave exchange DBD packets summary of LSDB

Exchange / DBDs ack and review LSR

Loading  / LSU exchange between Master/Slave

Full     / LSDB is the same

Now time to run the Dijkstra SPF algorithm and create routes for routing table

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f0e.shtml

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