7
Address Description
224.0.0.13 All Protocol Independent Multicast (PIM) routers.
224.0.0.14 RSVP encapsulation.
224.0.0.15 All Core-Based Tree (CBT) routers.
224.0.0.16 Designated 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:
{ 0xFF—If the most significant eight bits are 11111111, 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
tion
0 Reserved, set to 0.
R
• When set to 0, this address is an IPv6 multicast address
without an embedded RP address.
• When set to 1, 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, this address is an IPv6 multicast address not
based on a unicast prefix.
• When set to 1, 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, this address is an IPv6 multicast address
permanently-assigned by IANA.
• When set to 1, this address is a transient, or dynamically
assigned IPv6 multicast address.
{ Scope—The Scope field contains four bits, which represent the scope of the IPv6 internetwork
for which the multicast traffic is intended.
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