Which data plane protocol does EIGRP Over the Top use?

MPLS (Multi-Protocol Label Switching) is a forwarding mechanism that uses labels, but it is not the primary data plane protocol used by EIGRP Over the Top for its overlay encapsulation.

GRE (Generic Routing Encapsulation) is a tunneling protocol that could encapsulate IP packets, but EIGRP Over the Top specifically uses LISP for its advanced mapping system and data plane encapsulation.

EIGRP Over the Top is a Cisco solution designed to provide routing over an underlay network without direct routing adjacencies, and it achieves this by encapsulating data plane traffic using LISP. LISP separates the endpoint identifier (EID) from the routing locator (RLOC), allowing for flexible and scalable overlay routing.

IP-in-IP is a basic IP encapsulation method, but EIGRP Over the Top relies on the more sophisticated LISP protocol for its data plane functionality and mapping capabilities.