http://www.rfc-editor.org/rfc/rfc7868.txt
RFC 7868: Cisco's Enhanced Interior Gateway Routing Protocol (EIGRP), D. Savage, J. Ng, S. Moore, D. Slice, P. Paluch, R. White2016-05-01T23:00:00-00:00This document describes the protocol design and architecture for Enhanced Interior Gateway Routing Protocol (EIGRP). EIGRP is a routing protocol based on Distance Vector technology. The specific algorithm used is called "DUAL", a Diffusing Update Algorithm as referenced in "Loop-Free Routing Using Diffusing Computations" (Garcia-Luna-Aceves 1993). The algorithm and procedures were researched, developed, and simulated by SRI International.