H3C S5600 Series Operation Manual page 1215

Operation Manual – IPv6 Management
H3C S5600 Series Ethernet Switches
Table 1-1 Mapping between address types and format prefixes
Unicast
address
Multicast address
Anycast address
III. Unicast address
There are several forms of unicast address assignment in IPv6, including global unicast
address, link-local address, and site-local address.
The global unicast address, equivalent to an IPv4 public address, is used for
aggregatable links and provided for network service providers. This type of
address allows efficient routing aggregation to restrict the number of global routing
entries.
The link-local address is used in the neighbor discovery protocol and the stateless
autoconfiguration process. Routers must not forward any packets with link-local
source or destination addresses to other links.
IPv6 unicast site-local addresses are similar to private IPv4 addresses. Routers
must not forward any packets with site-local source or destination addresses
outside of the site (equivalent to a private network).
Loopback address: The unicast address 0:0:0:0:0:0:0:1 (represented in shorter
format as ::1) is called the loopback address and may never be assigned to any
physical interface. Like the loopback address in IPv4, it may be used by a node to
send an IPv6 packet to itself.
Unassigned address: The unicast address :: is called the unassigned address and
may not be assigned to any node. Before acquiring a valid IPv6 address, a node
may fill this address in the source address field of an IPv6 packet, but may not use
it as a destination IPv6 address.
Type
Unassigned
00...0 (128 bits)
address
Loopback
00...1 (128 bits)
address
Link-local
1111111010
address
Site-local
1111111011
address
Global unicast
other forms
address
11111111
Anycast addresses are taken from unicast address
space and are not syntactically distinguishable
from unicast addresses.
Format prefix (binary)
1-5
Chapter 1 IPv6 Configuration
IPv6 prefix ID
::/128
::1/128
FE80::/10
FEC0::/10
—
FF00::/8