Some protocols can’t be so clearly defined as either distance-vector or link state. A great example is Cisco’s Enhanced IGRP (EIGRP), which is more accurately defined as a hybrid between the two. While distance vector protocols typically rely on the broadcast of complete routing tables, EIGRP instead only sends out specific updates when the metric to a route changes. Like link state protocols, EIGRP also maintains a database of neighboring routers and the network topology.
