Operation Manual – IPv6 Management
H3C S3100 Series Ethernet Switches Chapter 1 IPv6 Configuration
1-5
Table 1-1 Mapping between address types and format prefixes
Type
Format prefix
(binary)
IPv6 prefix ID
Unassigned address
00...0 (128 bits) ::/128
Loopback address
00...1 (128 bits) ::1/128
Link-local address
1111111010 FE80::/10
Site-local address
1111111011 FEC0::/10
Unicast address
Global unicast address other forms
—
Multicast address
11111111 FF00::/8
Anycast address
Anycast addresses are taken from
unicast address space and are not
syntactically distinguishable from
unicast addresses.
III. Unicast address
There are several forms of unicast address assignment in IPv6, including global unicast
address, link-local address, and site-local address.
z 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.
z 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.
z 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).
z 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.
z 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.
IV. Multicast address
Multicast addresses listed in Table 1-2 are reserved for special purpose.
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