H3C Technologies H3C S10500 Series Switches - Manual (Page 319)

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a result, some IPv6 PIM-capable routers cannot receive the multicast data addresses to a specific
multicast group because their join messages are suppressed. To solve this problem, disable the join
suppression function on all IPv6 PIM-capable routers that connect to the IPv6 PIM snooping-capable
switch in the VLAN.
Solution
1. Use the pim ipv6 hello-option neighbor-tracking command to enable the neighbor tracking
function on the interfaces of IPv6 PIM-capable routers that connect to the IPv6 PIM
snooping-capable switch.
2. If the network has an IPv6 PIM-capable router that cannot be enabled with the neighbor tracking
function, be sure to disable IPv6 PIM snooping on the IPv6 PIM snooping-capable switch.