Selective P-Multicast Service Interface (S-PMSI) Parameters 2010-03-01 2012-02-21 S-PMSI Join Message Type Field IETF Review 0 Unassigned 1 PIM IPv4 S-PMSI (unaggregated) 2-3 Unassigned 4 GRE S-PMSI for IPv6 traffic (unaggregated) 5-255 Unassigned