Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > Distributing Topology Information > Overview of the OSPF Database Exchange Process
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > LSAs > Overview of the OSPF Database Exchange Process
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > Neighbor Relationships > Overview of the OSPF Database Exchange Process
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > Neighbor States > Two-Way > Overview of the OSPF Database Exchange Process



Overview of the OSPF Database Exchange Process


After two OSPF routers become neighbors and reach a two-way state, the next step may not be to exchange topology information. First the routers must first decide if they should directly exchange topology information, or if the two neighbors should learn each other's topology information, in the form of LSAs, indirectly. As soon as a pair of OSPF neighbors knows that they should share topology information directly, they exchange the topology data (LSAs). After this is completed, the process moves to a relatively quiet maintenance state in which the routers occasionally reflood the LSAs and watch for changes to the network.







References

Odom, Wendell (2008) CCNA ICND2 Official Exam Certification Guide, Second Edition. Indianapolis: Cisco Press.