Sparse Mode PIM
Only one RP is chosen for a particular group
RP statically configured or dynamically learned (Auto-RP, PIM v2 candidate RP advertisements)
Data forwarded based on the source state (S, G) if it exists, otherwise use the shared state (*, G)
Draft: draft-ietf-idmr-pim-sm-specv2-00.txt
Draft: draft-ietf-idmr-pim-arch-04.txt