http://www.rfc-editor.org/rfc/rfc4687.txt
RFC 4687: Operations and Management (OAM) Requirements for Point-to-Multipoint MPLS Networks, S. Yasukawa, A. Farrel, D. King, T. Nadeau2006-09-01T23:00:00-00:00This document describes requirements for data plane operations and management for P2MP MPLS LSPs. These requirements apply to all forms of P2MP MPLS LSPs, and include P2MP Traffic Engineered (TE) LSPs and multicast LSPs. This memo provides information for the Internet community.