Wijnands, IJ., Rosen, E., and U. Joorde, "Encoding Multipoint LDP (mLDP) Forwarding Equivalence Classes (FECs) in the NLRI of BGP MCAST-VPN Routes", RFC 7441, DOI 10.17487/RFC7441, January 2015, <https://www.rfc-editor.org/info/rfc7441>.