Beckhaus, T., Ed., Decraene, B., Tiruveedhula, K., Konstantynowicz, M., Ed., and L. Martini, "LDP Downstream-on-Demand in Seamless MPLS", RFC 7032, DOI 10.17487/RFC7032, October 2013, <https://www.rfc-editor.org/info/rfc7032>.