Development Status and Analysis of Soft Defined Network

The Internet has led to the creation of a digital society,where almost everything is connected and is accessible from anywhere.Thus,it brings great convenience to peoples life and communication.However,traditional IP networks are complex and very hard to manage.It is very difficult to configure the network according to predefined policies.The new software-defined network (SDN) can efficiently change this state by separating the control from forwarding.This network can simplify network management and better facilitate network evolution.This paper describes the development history,characters and research direction of the soft defined network,and focuses on the introduction of the architecture,key technology and application.