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OSPF - Neighbor States
OSPF router states as they form adjacencies
8
Computer Networking
Professional
08/31/2015

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Term
In this state, no Hello packets have been received on the interface.
Definition
DOWN
Term
In this state, neighbors must be configured manually. It applies only to nonbroadcast multi-access (NBMA) network connections.
Definition
ATTEMPT
Term
In this state, Hello packets have been received from another router, but bidirectional communication hasn’t been established yet.
Definition
INIT
Term
In this state, Hello packets that include their own router ID in the Neighbor field have been received. Bidirectional communication has been established.
Definition
2WAY
Term
In this state, the DR and BDR establish adjacencies with each router in the network. A master-slave relationship is created between each router and its adjacent DR and DBR. The router with the highest RID becomes the master.
Definition
EXSTART
Term
In this state, routing information is exchanged using Database Description (DBD or DD) packets, and Link State Request (LSR) and Link State Update packets may also be sent.
Definition
EXCHANGE
Term
In this state, Link State Request (LSR) packets are sent to neighbors to request any Link-State Advertisements (LSAs) that may have been missed or corrupted while the routers were in the EXCHANGE state. Neighbors respond with Link State Update (LSU) packets, which are in turn acknowledged with Link State Acknowledgement (LSAck) packets.
Definition
LOADING
Term
In this state, all LSA information is synchronized among neighbors, and adjacency has been established. OSPF routing can begin.
Definition
FULL
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