The following topics are covered in this appendix:
Neighbor Discovery and Recovery
Reliable Transport Protocol
DUAL Finite-State Machine
EIGRP Packet Types
The Enhanced Interior Gateway Routing Protocol (EIGRP) is an evolution from its predecessor IGRP, resulting from the demands of diverse and large-scale internetworks. EIGRP integrates the capabilities of link-state and distance vector protocols.
EIGRP provides backward compatibility and seamless interoperation with IGRP routers. An automatic-redistribution mechanism allows IGRP routes to be imported into Enhanced IGRP and vice versa, making it possible to migrate EIGRP into an existing ...