What occurs when OSPF is enabled on an interface?

When OSPF is enabled on an interface, the protocol initiates the process of sending hello messages out of that interface. Hello messages are essential for OSPF operation as they are used to discover and maintain neighbor relationships with other OSPF routers. By exchanging these hello packets, OSPF routers can establish adjacencies, which are required for the routing protocol to function effectively and share routing information.

The ability to send hello messages is a fundamental aspect of how OSPF operates in a multi-access network, like Ethernet, where routers need to identify each other and form a reliable adjacency. This process is critical for the proper operation of OSPF and ultimately facilitates the efficient routing of traffic within the network.