Introduction To Ipv6 Address - H3C S7500E Series Operation Manual

Operation Manual – IPv6 Configuration
H3C S7500E Series Ethernet Switches
Stateless address configuration means that a host automatically configures an
IPv6 address and related information on basis of its own link-layer address and the
prefix information advertised by a router.
In addition, a host can generate a link-local address on basis of its own link-layer
address and the default prefix (FE80::/64) to communicate with other hosts on the link.
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. QoS support
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 is implemented through a group of Internet
Control Message Protocol Version 6 (ICMPv6) messages that manages the information
exchange between neighbor nodes on the same link. The group of ICMPv6 messages
takes the place of Address Resolution Protocol (ARP) message, Internet Control
Message Protocol version 4 (ICMPv4) router discovery message, and ICMPv4
redirection message 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 handling efficiency. The Options field in IPv4 packets contains 40
bytes at most, 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, and the 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:
Chapter 1 IPv6 Basics Configuration
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