Applicable RFCs
PIM is compatible with these RFCs:
RFC 3376 - Internet Group Management Protocol, Version 3
RFC 2365 - Administratively Scoped IP Multicast
RFC 2932 - Multicast Routing MIB, with exceptions, see "Exceptions to Support for RFC 2932 - Multicast Routing MIB".
RFC 2933 - IGMP MIB
RFC 2934 - Protocol Independent Multicast MIB for IPv4