Which side of the OSPF router initiates the database description exchange?

In OSPF (Open Shortest Path First) routing protocol, the side that initiates the database description (DBD) exchange is determined by the router ID, which is a unique identifier for each OSPF router. When two routers establish an adjacency in OSPF, they compare their router IDs to determine which one will take the lead in the exchange process; the router with the higher router ID will initiate the DBD exchange.

This process is essential for synchronizing OSPF databases between neighboring routers and ensuring they have the same view of the network topology. By employing the router ID for this purpose, OSPF maintains a consistent and predictable method for establishing communication between routers, which facilitates efficient network convergence.

Additionally, the router ID is static, meaning it doesn’t change unless specifically reconfigured, providing stability in establishing the roles of routers during adjacency formation. Consequently, the router with the higher router ID takes the initiative, allowing for a clear leader in the exchange process for routing information.