OSPF
    An interior gateway
        routing protocol for TCP/IP networks, Open Shortest Path First uses a link state routing
        algorithm that calculates routes for packets based on a number of factors, including least
        hops, speed of transmission lines, and congestion delays. You can also configure certain
        cost metrics for the algorithm. This protocol is more efficient and scalable than
        vector-distance routing protocols. OSPF features include least-cost routing, ECMP routing,
        and load balancing. Although OSPF requires CPU power and memory space, it results in
        smaller, less frequent router table updates throughout the network. This protocol is more
        efficient and scalable than vector-distance routing protocols.