Rekhter, Y., Aggarwal, R., Leymann, N., Henderickx, W., Zhao, Q., and R. Li, "Carrying Protocol Independent Multicast - Sparse Mode (PIM-SM) in Any-Source Multicast (ASM) Mode Trees over Multipoint LDP (mLDP)", RFC 7442, DOI 10.17487/RFC7442, February 2015, <https://www.rfc-editor.org/info/rfc7442>.