http://www.rfc-editor.org/rfc/rfc6348.txt
RFC 6348: Requirements for Point-to-Multipoint Extensions to the Label Distribution Protocol, JL. Le Roux, T. Morin2011-09-01T23:00:00-00:00This work was overtaken by the protocol solution developed by the MPLS working group, but that solution did not closely follow the requirements documented here. This document is published as a historic record of the ideas and requirements that shaped the protocol work. This document defines a Historic Document for the Internet community.