H3C S7500E Series Operation Manual page 570

Operation Manual – IPv6 Configuration
H3C S7500E Series Ethernet Switches
Leading zeros in each group can be removed. For example, the above-mentioned
address
2001:0:130F:0:0:9C0:876A:130B.
If an IPv6 address contains two or more consecutive groups of zeros, they can be
replaced by the double-colon :: option. For example, the above-mentioned
address
2001:0:130F::9C0:876A:130B.
Caution:
The double-colon :: option can be used only once in an IPv6 address. Otherwise, the
device is unable to determine how many zeros double-colons represent when
converting them to zeros to restore a 128-bit IPv6 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 utmost left of an IPv6 address are the
address prefix.
II. IPv6 address classification
IPv6 addresses 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).
can be represented
can be represented
1-4
Chapter 1 IPv6 Basics Configuration
in shorter
in the shortest
format as
format as