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This article will explain in detail the example analysis of SDN software-defined network for you. The content of the article is of high quality, so the editor will share it with you for reference. I hope you will have some understanding of the relevant knowledge after reading this article.

SDN Software-defined Network 1: the Dilemma of Today's Network

The current network is dominated by the TCP/IP protocol, from the local area network to the Internet, the network has changed our lives, but today's network is not a perfect network, there are all kinds of problems.

The 1:TCP/IP protocol system is not immutable, but with the emergence of the development of the network, we have to tinker with the existing protocol system, which makes the whole protocol system seem very bloated.

2: a variety of control protocols are used, which is not only responsible for data forwarding, but also responsible for the generation and maintenance of forwarding table items at the control level. This makes the underlying network control protocol very complex, the network equipment becomes very complex, and it is difficult to achieve unified deployment. At the same time, the cost increases.

3: another disadvantage is that the whole network is closed and passive, all services are carried passively, the distinction between services becomes very difficult, and it is difficult for customers to upgrade the existing network according to specific services. The upgrade or change of network and business is often accompanied by the replacement of hardware equipment.

4: with the rise of cloud computing and the development of virtualization technology, computing and storage become a dynamic resource pool, which supports cloud computing. However, with the lag of network development, network resources can not be included in this resource pool for a long time. Therefore, the network needs to make fundamental changes to adapt to this virtual and dynamic cloud computing environment.

All kinds of problems need a new framework to solve. So SDN came into being.

Second: what is SDNSDN that I understand?

SDN is a network design concept, a subversion of the traditional design idea, as long as the network hardware can be centralized software management, programmability, control and forwarding separation, and has an open interface, it can be regarded as a SDN network.

In the early days of large computers, different chips had to develop special operating systems, and then develop special application systems. It was only later that Windows and linux shielded the underlying hardware devices and provided a unified interface for user applications to call hardware devices. At the same time, the whole system is programmable, and users can develop applications according to application requirements and run on the operating system. The ultimate goal of SDN is to achieve this model in the computer network system, to provide users with an open and efficient network operating system, and the most important of this operating system is the controller. Users can develop a variety of APP on the controller, for example, if you develop a switch APP on the controller, then the underlying network is a switch, or a higher-level development of a traffic scheduling APP, then users can use this APP to control the underlying devices to achieve traffic scheduling.

Compared with today's computer systems, in SDN, the hardware Openflow device is like an X86 server, the SDN controller is the Windows Server operating system, and the network function is all kinds of applications on the Windows Server, which is equivalent to the software of the network function (layer 2 and layer 3 forwarding control, traffic scheduling, etc.) on the SDN controller.

This is the end of the sample analysis of SDN software-defined networks. I hope the above content can be helpful to you and learn more. If you think the article is good, you can share it for more people to see.

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