EIGRP

very low usage of network resources during normal operation; only hello packets are transmitted on a stable network
when a change occurs, only routing table changes are propagated, not the entire routing table; this reduces the load the routing protocol itself places on the network
rapid convergence times for changes in the network topology (in some situations convergence can be almost instantaneous)
EIGRP is an enhanced distance vector protocol, relying on the Diffused Update Algorithm (DUAL) to calculate the shortest path to a destination within a network.