What does sdn mean?

Software defined network (software? Definition? Network (SDN) is a new network innovation framework proposed by the Whiteboard Research Group of Stanford University, and it is a way to realize network virtualization.

Its core technology, OpenFlow, separates the control plane and data plane of network devices, thus realizing the flexible control of network traffic, making the network as a pipeline more intelligent and providing a good platform for the innovation of core networks and applications.

brief introduction

SDN originated from the whiteboard research project of Stanford University in 2006. In 2009, Professor Mckeown formally put forward the concept of SDN.

Software defined network SDN (software? Definition? Network) was founded by Stanford university CLean? Slate research group proposed a new network innovation architecture, which can define and control the network through software programming. Its characteristics of separation of control plane and forwarding plane and open programming are considered as a revolution in the network field, which provides a new experimental approach for the research of new Internet architecture and greatly promotes the development of the next generation Internet.

The traditional network world is standard and open, and each network element can be interconnected with the surrounding network elements. In the computer world, not only is the horizontal standard open, but also the vertical standard open. From bottom to top are hardware, driver, operating system, programming platform, application software, etc. Programmers can easily create various applications.

From a certain point of view, compared with computers, the network is "relatively closed" and "frameless" vertically, so it is relatively difficult to create applications and deploy services vertically. However, SDN will become open, standardized and programmable in the vertical direction of the whole network (not just network elements), thus making it easier and more effective for people to use network resources.

Therefore, SDN technology can effectively reduce equipment load, help network operators to better control infrastructure and reduce overall operating costs, and become one of the most promising network technologies.