User's Manual

22-33
Avoid the use of Network Address Translation. The purpose of the introduction of NAT mechanism is to share
and reuse same address space among different network segments. This mechanism mitigates the problem of
the shortage of IPv4 address temporally; meanwhile it adds the burden of address translation process for
network device and application. Since the address space of IPv6 has increased greatly, address translation
becomes unnecessary, thus the problems and system cost caused by NAT deployment are solved naturally.
Support extensively deployed Routing Protocol. IPv6 has kept and extended the supports for existing Internal
Gateway Protocols (IGP for short), and Exterior Gateway Protocols (EGP for short). For example, IPv6
Routing Protocol such as RIPng, OSPFv3, IS-ISv6 and MBGP4+, etc.
Multicast addresses increased and the support for multicast has enhanced. By dealing with IPv4 broadcast
functions such as Router Discovery and Router Query, IPv6 multicast has completely replaced IPv4
broadcast in the sense of function. Multicast not only saves network bandwidth, but enhances network
efficiency as well.
22.2.2 IP Configuration
Layer 3 interface can be configured as IPv4 interface, IPv6 interface.
22.2.2.1 IPv4 Address Configuration
IPv4 address configuration task list:
1. Configure the IPv4 address of three-layer interface
1. Configure the IPv4 address of three-layer interface
Command
Explanation
VLAN Interface Configuration Mode
ip address <ip-address> <mask>
[secondary]
no ip address [<ip-address> <mask>]
Configure IP address of VLAN interface;
the no ip address [<ip-address>
<mask>] command cancels IP address of
VLAN interface.
22.2.2.2 IPv6 Address Configuration
The configuration Task List of IPv6 is as follows:
1. IPv6 basic configuration
(1) Configure interface IPv6 address
(2) Configure IPv6 static routing
2. IPv6 Neighbor Discovery Configuration
(1) Configure DAD neighbor solicitation message number
(2) Configure send neighbor solicitation message interval