Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > OSPF > OSPF Database Exchange Process > Comparing LSDBs
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > OSPF > LSAs > Comparing LSDBs
Root: WRM Database > Information Technology > Certifications > CCNA > Routing Protocols > OSPF > LSDBs > Comparing LSDBs



Comparing LSDBs


After two routers decide to exchange databases, they do not send the contents of the entire database. First, they tell each other a list of LSAs in their respective databases - not all the details of the LSAs, just a list. Each router then compares the other router's list to its own LSDB. For any LSAs that a router does not have a copy of, the router asks the neighbor for a copy of the LSA, and the neighbor sends the full LSA.







References

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