What is OSPF/IS-IS?

OSPF (Open Shortest Path First) is a link-state routing protocol used within a single autonomous system (AS). It gathers link state information from available routers and constructs a topology map of the network. This map is then used to determine the shortest path to each destination, enabling efficient routing decisions. OSPF is commonly used in enterprise networks and larger service provider networks due to its scalability and fast convergence.