OSPF Adjacencies are Established but the OSPF Routes are

Understanding OSPF Areas, OSPF Designated Router Overview, Example: Configuring an OSPF Router Identifier, Example: Controlling OSPF Designated Router Election, Understanding OSPF Areas and Backbone Areas, Example: Configuring a Single-Area OSPF Network, Example: Configuring a Multiarea OSPF Network, Understanding Multiarea Adjacency for OSPF, Example: Configuring Multiarea Adjacency for OSPF OSPF Adjacencies are Established but the OSPF Routes are Aug 05, 2019 OSPF Fundamental Terminology Explained

The OSPF neighbor state 2-way means that the router is available to exchange its LSDB with the neighbor. So, once two routers on a point-to-point link reach the 2-way state, they can immediately move on to the process of database exchange. The database exchange process can be involved with several OSPF messages and several interim neighbor states.

The LSDB (Link State Database) is the database that OSPF builds and is based on the information that it has found in LSAs (Link State Advertisements). The LSDB is … IP Routing: OSPF Configuration Guide, Cisco IOS XE Release Jul 31, 2018

Jul 31, 2018

The link-state advertisement (LSA) is a basic communication means of the OSPF routing protocol for the Internet Protocol (IP). It communicates the router's local routing topology to all other local routers in the same OSPF area. OSPF is designed for scalability, so some LSAs are not flooded out on all interfaces, but only on those that belong to the appropriate area.