H3C S5600 Series Operation Manual page 1214

Operation Manual – IPv6 Management
H3C S5600 Series Ethernet Switches
Caution:
The double-colon :: can be used only once in an IPv6 address. Otherwise, the device is
unable to determine how many zeros the double-colon represents when converting it to
zeros to restore the IPv6 address to a 128-bit address.
An IPv6 address consists of two parts: address prefix and interface ID. The address
prefix and the interface ID are respectively equivalent to the network ID and the host ID
in an IPv4 address.
An IPv6 address prefix is written in IPv6-address/prefix-length notation, where
IPv6-address is an IPv6 address in any of the notations and prefix-length is a decimal
number indicating how many bits from the left of an IPv6 address are the address
prefix.
II. IPv6 address classification
IPv6 addresses mainly fall into three types: unicast address, multicast address and
anycast address.
Unicast address: An identifier for a single interface, similar to an IPv4 unicast
address .A packet sent to a unicast address is delivered to the interface identified
by that address.
Multicast address: An identifier for a set of interfaces (typically belonging to
different nodes), similar to an IPv4 multicast address. A packet sent to a multicast
address is delivered to all interfaces identified by that address.
Anycast address: An identifier for a set of interfaces (typically belonging to
different nodes).A packet sent to an anycast address is delivered to one of the
interfaces identified by that address (the nearest one, according to the routing
protocols' measure of distance).
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 Their function is superseded by multicast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 format prefix.
mapping between major address types and format prefixes.
1-4
Chapter 1 IPv6 Configuration
Table 1-1 lists the