Operation Manual

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0XFF at the start of the address identifies the address as being a multicast address.
Flags have 4 bits. The high-order flag is reserved, and must be initialized to 0.
T=0 indicates a permanently-assigned multicast address assigned by the Internet Assgined
Numbers Authority (IANA).
T=1 indicates a non-permanently-assigned multicast address.
Scope is a 4-bit value used to limit the scope of the multicast group. The values are as follows:
Value
Indication
0
、
3
、
F
reserved
1
Interface-Local scope
2
Link-Local scope
4
Admin-Local scope
5
Site-Local scope
6
、
7
、
9–D
unassigned
8
Organization-local scope
E
Global scope
Table 10-2 Indications of the Scope
Reserved Multicast Addresses:
Address
Indication
FF01::1
All interface-local IPv6 nodes
FF02::1
All link-local IPv6 nodes
FF01::2
All interface-local IPv6 routers
FF02::2
All link-local IPv6 routers
FF05::2
All site-local IPv6 routers
FF0X::
X ranges from 0 to F. These multicast addresses are
reserved and shall never be assigned to any multicast
group.
Table 10-3 Reserved IPv6 Multicast Addresses