Hi all,
a basic EIGRP version (without stub and summaries) is published as the informational
RFC 7868.
This is not in the standards track, thus EIGRP is still proprietary. Cisco provides an
FAQ regarding this.
Of course the stub and summary features, missing from the RFC, are required to scale EIGRP networks, so it is not really clear if there are practical reasons for implementing the RFC.
Thanks,
Erik