Xorp provides the following IPv6 multicast features:

  Lastest PIM-SM spec (draft-ietf-pim-sm-v2-new-09)
  The Bootstrap mechanism (draft-ietf-pim-sm-bsr-03), including scoping
  Static RPs
  IGMPv1 and v2
  MLDv1
  Tested to work on FreeBSD and Linux:

• In case of Linux only IPv4 works because the kernel itself doesn’t support IPv6 multicast routing.
• In case of FreeBSD if you want to run IPv4 you must have a kernel with PIM support (e.g., FreeBSD-4.9 or FreeBSD-5.2 or newer). Older FreeBSD versions should still work for IPv6.