H3C S5500-EI - Page 28

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The following describes the fields of an IPv6 multicast address:
{ 0xFF—The most significant eight bits are 11111111, which indicates that this address is an IPv6
multicast address.
{ Flags—The Flags field contains four bits.
Figure 5 Flags field format
Table 4 Flags field description
Bit Descri
p
tion
0 Reserved, set to 0.
R
• When set to 0, it indicates that this address is an IPv6 multicast
address without an embedded RP address.
• When set to 1, it indicates that this address is an IPv6 multicast
address with an embedded RP address. (The P and T bits must
also be set to 1.)
P
• When set to 0, it indicates that this address is an IPv6 multicast
address not based on a unicast prefix.
• When set to 1, it indicates that this address is an IPv6 multicast
address based on a unicast prefix. (The T bit must also be set to
1. )
T
• When set to 0, it indicates that this address is an IPv6 multicast
address permanently-assigned by IANA.
• When set to 1, it indicates that this address is a transient, or
dynamically assigned IPv6 multicast address.
{ Scope—The Scope field contains four bits, which indicate the scope of the IPv6 internetwork for
which the multicast traffic is intended.
Table 5 Values of the Scope field
Value Meanin
g
0, F Reserved
1 Interface-local scope
2 Link-local scope
3 Subnet-local scope
4 Admin-local scope
5 Site-local scope
6, 7, 9 through D Unassigned
8 Organization-local scope
E Global scope