H3C S7500E Series Operation Manual page 571

Operation Manual – IPv6 Configuration
H3C S7500E Series Ethernet Switches
Note:
There are no broadcast addresses in IPv6. Their function is superseded by multicast
addresses.
The type of an IPv6 address is designated by the first several bits called format prefix.
Table 1-1
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 aggregatable
global unicast address, link-local address, and site-local address.
The aggregatable global unicast address, equivalent to an IPv4 public address, is
provided for network service providers. The type of address allows efficient route
prefix aggregation to restrict the number of global routing entries.
The link-local address is used for communication between link-local nodes in
neighbor discovery and stateless autoconfiguration. 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 the
shortest 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.
lists the mappings between address types and format prefixes.
Type
Unassigned
address
Loopback address
Link-local address
Site-local address
Global unicast
address
Chapter 1 IPv6 Basics Configuration
Format prefix (binary)
00...0 (128 bits)
00...1 (128 bits)
1111111010
1111111011
other forms
11111111
Anycast addresses are taken from unicast
address space and are not syntactically
distinguishable from unicast addresses.
1-5
IPv6 prefix ID
::/128
::1/128
FE80::/10
FEC0::/10
—
FF00::/8