You can set the PIMv6 mode to sparse, which routes protocols using shared trees. In a shared tree, sources forward multicast datagrams to a directly connected router (the designated router). The designated router encapsulates the datagram, and unicasts it to an assigned RP router, which then forwards the datagram to members of multicast groups. The default mode is sparse. As of the current release, dense mode is not supported.
SEFOS# configure terminal SEFOS(config-if)# set ipv6 pim enable
SEFOS(config)# ip pim component component_ID
SEFOS(pim-comp)# set mode sparse SEFOS(pim-comp)# end
SEFOS# show ipv6 pim component 1 PIM Component Information --------------------------- Component-Id: 1 PIM Mode: sparse, PIM Version: 2 Elected BSR: :: Candidate RP Holdtime: 30