Because OSPF is a link state routing protocol, neighbors don't exchange routing tables. Instead, they exchange information about network topology. Each OSFP router then runs SFP algorithm to calculate the best routes and adds those to the routing table.

How often does OSPF send routing updates?

Although OSPF does not refresh routing updates periodically, it does reflood LSAs every 30 minutes. Each LSA includes the link-state age variable, which counts the age of the LSA packet. When a network change occurs, the LSA's advertising router generates an updated LSA to reflect the change in the network topology.

How does OSPF check routing table?

To display the Open Shortest Path First (OSPF) routing table entries to an Area Border Router (ABR) and Autonomous System Boundary Router (ASBR), use the show ip ospf border-routers command. Use the show ip ospf border-routers command to display information on ABRs.