http://www.rfc-editor.org/rfc/rfc6559.txt
RFC 6559: A Reliable Transport Mechanism for PIM, D. Farinacci, IJ. Wijnands, S. Venaas, M. Napierala2012-03-01T23:00:00-00:00This document defines a reliable transport mechanism for the PIM protocol for transmission of Join/Prune messages. This eliminates the need for periodic Join/Prune message transmission and processing. The reliable transport mechanism can use either TCP or SCTP as the transport protocol. This document defines an Experimental Protocol for the Internet community.