Managing HP Serviceguard for Linux, Seventh Edition, July 2007

IPv6 Network Support
IPv6 Address Types
Appendix E 363
“FF” at the beginning of the address identifies the address as a multicast
address.
The “flags” field is a set of 4 flags “000T”. The higher order 3 bits are
reserved and must be zero. The last bit ‘T’ indicates whether it is
permanently assigned or not. A value of zero indicates that it is
permanently assigned otherwise it is a temporary assignment.
The “scop” field is a 4-bit field which is used to limit the scope of the
multicast group. For example, a value of ‘1’ indicates that it is a
node-local multicast group. A value of ‘2’ indicates that the scope is
link-local. A value of “5” indicates that the scope is site-local.
The “group ID” field identifies the multicast group. Some frequently used
multicast groups are the following:
All Node Addresses = FF02:0:0:0:0:0:0:1 (link-local)
All Router Addresses = FF02:0:0:0:0:0:0:2 (link-local)
All Router Addresses = FF05:0:0:0:0:0:0:2 (site-local)