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7
Address Description
224.0.0.12
DHCP server/relay agent.
224.0.0.13
All PIM routers.
224.0.0.14 RSVP
encapsulation.
224.0.0.15
All CBT routers.
224.0.0.16 SBM.
224.0.0.17 All
SBMs.
224.0.0.18 VRRP.
•
IPv6 multicast addresses:
Figure 4
IPv6 multicast format
The following describes the fields of an IPv6 multicast address, as shown in
{
0xFF
—Contains the most significant eight bits 11111111, which indicates that this address is an
IPv6 multicast address.
{
Flags
—Contains four bits, as shown in
and described in
.
Figure 5
Flags field format
Table 4
Flags field description
Bit Description
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.