group address
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... address of the RP is encoded in the IPv6 multicast group address,
and specifies a PIM-SM group ...
... o A specification of a subrange of [RFC3306] IPv6 multicast group
addresses defined by setting one previously unused bit of the
Flags field ...
... Flags field to "1",
o a specification of the mapping by which such a group address
encodes the RP address ...
... RP address can't be embedded into a 128-bit group address
with space left to carry the group identity ...
... multicast addresses is outside the scope of this
document; it is up to the RP and applications to ensure that group
addresses are unique by using some unspecified method. However, the
mechanisms are probably similar to those used with [RFC3306 ...
... RIID=0 is reserved, see section 6.3). However, each of these
is an IPv6 group address of its own (i.e., there can be only one RP
per multicast address ...
... subnet, e.g., 2001:DB8:BEEF:FEED::/64.
In that case, the group addresses would be something like
"FF7x:y40:2001:DB8:BEEF:FEED::/96", and then their RP address ...
... administrator selects the least
specific part of the unicast prefix, with plen=32, and the group
addresses will be from the multicast prefix:
...
... RP address
configuration in the scenarios where it is desirable to have the
group addresses be consistent with the unicast prefix allocations.
...
... throughout the PIM domain is not necessary, as each group address
specifies the RP to be used.
...
... Group) or (S,G) Join by
guessing/learning the source and/or the group address. For proper
protection, one should set up, for example, PIM multicast ...
... RP mapping must be
redone for every new IPv6 group address that would map to a different
RP. For efficiency, the results may be cached in an implementation-
...
...
1. A receiver finds out a group address by some means (e.g., SDR or a
web page).
...
...
1. A sender finds out a group address by using an unspecified method
(e.g., by contacting the administrator ...