EIGRP enghanced version of the IGRP that supports variable-length subnet masks and several additional features.
EIGRP uses an autonomous system number parameter in the configuration just as IGRP does. This number is arbitrary but must be the same on all routers within the autonomous system.
To configure a router to participate in EIGRP routing within autonomous system 5 and advertise routing information about the 192.168.200.0 network, use:
router eigrp 5