Root: WRM Database > Information Technology > Certifications > CCNA > Acronyms > LSA > How OSPF Works
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > BDR > How OSPF Works
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > DR > How OSPF Works
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > Interface Type > How OSPF Works
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > LSAs > How OSPF Works
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > LSDBs > How OSPF Works
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > Neighbor States > "Full" (Fully Adjacent) How OSPF Works
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > Link-State > OSPF > Neighbors > Fully Adjacent > How OSPF Works



How OSPF Works


Step 1: Based on the OSPF interface type, the routers may or may not collectively elect a Designated Router (DR) and Backup Designated Routed (BDR).

Step 2: For each pair of routers that need to become fully adjacent, mutually exchange the contents of their respective Link State Databases (LSDBs).

Step 3: When completed, the neighbors monitor for changes and periodically reflood Link State Advertisements (LSAs) while in the Full (fully adjacent) neighbor state.







References

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