Step #1: Down state: OSPF process not yet started. No Hello packet sent.
Step #2: Init state: Hello packets have been sent to all OSPF interfaces.
Step #3: Two-way state: Router has received a Hello packet from another router that contains its own router ID in the neighbor lost. All parameters match, so routers can become neighbors.
Step #4: Exstart state: If routers become adjacent (exchange routes), they determine which one starts the exchange process.
Step #5: Exchange state: Routers exchange DBDs listing the LSAs in their LSD by RID and sequence number.
Step #6: Loading state: Each router compares the DBD received to the contents of its LS database. It then sends a LSR for missing or outdated LSAs. Each router responds to its neighbor's LSR with a Link State Update. Each LSU is acknowledged.
Step #7: Full state: The LSDB has been synchronized with the adjacent neighbor.
Step #2: Init state: Hello packets have been sent to all OSPF interfaces.
Step #3: Two-way state: Router has received a Hello packet from another router that contains its own router ID in the neighbor lost. All parameters match, so routers can become neighbors.
Step #4: Exstart state: If routers become adjacent (exchange routes), they determine which one starts the exchange process.
Step #5: Exchange state: Routers exchange DBDs listing the LSAs in their LSD by RID and sequence number.
Step #6: Loading state: Each router compares the DBD received to the contents of its LS database. It then sends a LSR for missing or outdated LSAs. Each router responds to its neighbor's LSR with a Link State Update. Each LSU is acknowledged.
Step #7: Full state: The LSDB has been synchronized with the adjacent neighbor.
No comments:
Post a Comment