Introduction To Ipv6 Address - H3C S5500-SI Series Operation Manual

Operation Manual – IPv6 Configuration
H3C S5500-SI Series Ethernet Switches
V. Built-in security
IPv6 uses IPSec as its standard extension header to provide end-to-end security. This
feature provides a standard for network security solutions and improves the
interoperability between different IPv6 applications.
VI. Support for QoS
The Flow Label field in the IPv6 header allows the device to label packets in a flow and
provide special handling for these packets.
VII. Enhanced neighbor discovery mechanism
The IPv6 neighbor discovery protocol means a group of Internet control message
protocol version 6 (ICMPv6) messages manages the interaction between neighbor
nodes (nodes on the same link).The group of ICMPv6 messages takes the place of
address resolution protocol (ARP), Internet control message protocol version 4
(ICMPv4), and ICMPv4 redirection messages to provide a series of other functions.
VIII. Flexible extension headers
IPv6 cancels the Options field in IPv4 packets but introduces multiple extension
headers. In this way, IPv6 enhances the flexibility greatly to provide scalability for IP
while improving the processing efficiency. The Options field in IPv4 packets contains
only 40 bytes, while the size of IPv6 extension headers is restricted by that of IPv6
packets.

1.1.2 Introduction to IPv6 Address

I. IPv6 address format
An IPv6 address is represented as a series of 16-bit hexadecimals, separated by
colons. An IPv6 address is divided into eight groups, 16 bits of each group are
represented by four hexadecimal numbers which are separated by colons, for example,
2001:0000:130F:0000:0000:09C0:876A:130B.
To simplify the representation of IPv6 addresses, zeros in IPv6 addresses can be
handled as follows:
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
replaced by the double-colon :: option. For example, the above-mentioned
address
2001:0:130F::9C0:876A:130B.
can be represented
can be represented
1-3
Chapter 1 IPv6 Configuration
in shorter
in the shortest
format as
format as