Manual

[phone] www.qtech.ru
Москва, Новозаводская ул., 18, стр. 1
124
Command
Explanation
Global Mode
ip vrf <vrf-name>
no ip vrf <vrf-name>
Create VRF instance; VRF instance is not
created by default.
VRF Mode
rd <ASN:nn_or_IP-address:nn>
Configure RD of VRF instance. RD is not
created by default.
route-target {import | export | both} <rt-
value>
no route-target {import | export | both} <rt-
value>
Configure RT of VRF instance
Interface Mode
ip vrf forwarding <vrf-name>
no ip vrf forwarding <vrf-name>
Configure the relation between VRF
instance and the interface.
ip address <ip-address> <mask>
no ip address <ip-address> <mask>
Configure the private IP address of direct
link interface.
16.2 IP Configuration
16.2.1 Introduction to IPv4, IPv6
IPv4 is the current version of global universal Internet protocol. The practice has proved that
IPv4 is simple, flexible, open, stable, strong and easy to implement while collaborating well
with various protocols of upper and lower layers. Although IPv4 almost has not been changed
since it was established in 1980’s, it has kept growing to the current global scale with the
promotion of Internet. However, as Internet infrastructure and Internet application services
continue boosting, IPv4 has shown its deficiency when facing the present scale and complexity
of Internet.
IPv6 refers to the sixth version of Internet protocol which is the next generation Internet
protocol designed by IETF to replace the current Internet protocol version 4 (IPv4). IPv6 was
specially developed to make up the shortages of IPv4 addresses so that Internet can develop
further.
The most important problem IPv6 has solved is to add the amount of IP addresses. IPv4
addresses have nearly run out, whereas the amount of Internet users has been increasing in
geometric series. With the greatly and continuously boosting of Internet services and
application devices (Home and Small Office Network, IP phone and Wireless Service
Information Terminal which make use of Internet,) which require IP addresses, the supply of IP
addresses turns out to be more and more tense. People have been working on the problem of
shortage of IPv4 addresses for a long time by introducing various technologies to prolong the