3Com 4500G Family Configuration Manual page 409

Address
224.0.0.7
224.0.0.8
224.0.0.9
224.0.0.11
224.0.0.12
224.0.0.13
224.0.0.14
224.0.0.15
224.0.0.16
224.0.0.17
224.0.0.18
2) IPv6 multicast addresses
Figure 1-4 IPv6 multicast format
Referring to Figure 1-4, the meanings of the fields of an IPv6 multicast address are as follows:
0xFF: The most significant 8 bits are 11111111, indicating that this address is an IPv6 multicast
address.
Figure 1-5 Format of the Flags field
Flags: Referring to
Table 1-4 Description on the bits of the Flags field
Bit
0 Reserved, set to 0
When set to 0, it indicates that this address is an IPv6 multicast address without
an embedded RP address
R
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)
When set to 0, it indicates that this address is an IPv6 multicast address not
based on a unicast prefix
P
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)
Shared Tree (ST) routers
ST hosts
Routing Information Protocol version 2 (RIPv2) routers
Mobile agents
Dynamic Host Configuration Protocol (DHCP) server/relay agent
All Protocol Independent Multicast (PIM) routers
Resource Reservation Protocol (RSVP) encapsulation
All Core-Based Tree (CBT) routers
Designated Subnetwork Bandwidth Management (SBM)
All SBMs
Virtual Router Redundancy Protocol (VRRP)
Figure 1-5, the following table describes the four bits of the Flags field.
1-8
Description
Description