RFC 4291:IP Version 6 Addressing Architecture
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multicast group


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... nodes). An interface may belong to any number of multicast groups. Multicast addresses have the following format: ...
... 4-bit multicast scope value used to limit the scope of the multicast group. The values are as follows: 0 reserved ...
... group ID identifies the multicast group, either permanent or transient, within the given scope. Additional definitions of the multicast group ...
... multicast group, either permanent or transient, within the given scope. Additional definitions of the multicast group ID field structure are provided in [RFC3306]. ...
... The above multicast addresses are reserved and shall never be assigned to any multicast group. All Nodes ...



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