EIGRP:  Basic configuration
Technology: Routing
Area: IGP
Vendor: Cisco
Software: 12.X , 15.X, IP Base, IP Services
Platform: Catalyst 3560, 3750, 3850, 4500, 6500, ISR Routers

EIGRP (Enhanced Interior Gateway Routing Protocol) is an enhanced distance vector protocol that uses Diffusing Update Algorithm (DUAL) for shortest path calculation. Basic configuration enables EIGRP routing process and tells EIGRP which interfaces to include in routing process locally.

Router(config)#router eigrp 100
Router(config-router)#network 172.16.0.0 0.0.255.255
Router(config-router)#network 10.0.0.0 0.255.255.255