#04 OSPF states | OSPF Adjacency Process | OSPF Routing Protocol Tutorial | OSPF Protocol | OSPF
OSPF (Open Shortest Path First) Neighbor Adjacency States:
DOWN, ATTEMPT, INIT, 2-WAY, EXSTART, EXCHANGE, LOADING, and FULL
Down: In this state, routers have not yet established a neighbor relationship. They are not communicating or sharing routing information.
Init: After discovering a potential neighbor, routers enter the Init state. They send Hello packets to each other but have not yet confirmed the compatibility of their OSPF settings.
2-Way: Once routers in the Init state agree on parameters and acknowledge each other's Hello packets, they move to the 2-Way state. In this state, they have established a two-way communication and are ready to proceed with the OSPF neighbor relationship establishment.
Exstart: Once the exchange between the routers get started, both the routers move to the
Exstart: In this state, master and slave are selected based on the router's id. The master controls the sequence of numbers, and starts the exchange process.
Exchange: In the exchange state, both the routers send a list of LSAs to each other that contain a database description.
Loading: On the loading state, the LSR, LSU, and LSA are exchanged.
Full: The Full state is the desired final state. Routers in this state have fully established a neighbor relationship, exchanged routing information, and are actively participating in the OSPF routing process. They are now ready to forward OSPF routing updates and make routing decisions.
Related Video🎬
OSPF Concepts : • OSPF | OSPF Protocol| OSPF configurat...
🚶♀️Video Walkthrough
0:05 -Introduction & Interview Tips
0:30 -OSPF 7 States
0:50 -OSPF Down State
2:32 -OSPF Init State
3:10 -OSPF 2Way State
4:00 -OSPF Exstart State
5:09 -OSPF Exchange State
6:12 -OSPF Loading State
7:06 -OSPF Full State
7:17 -OSPF 7 States Summary
8:55 - Demo
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