Shulou(Shulou.com)06/03 Report--

Modern computers began with mechanical computers, invented by French mathematician Pascal at the age of 19 in the 17th century, mainly for calculating taxes for his father. 1673 German mathematician Leibniz invents the multiplier, the first computer capable of performing complete four arithmetic operations. In 1822 Babbage spent nearly 10 years conceiving and successfully developing the first difference engine, which could automatically complete the whole operation process of higher-order polynomials according to the designer's arrangement.

Computer is an important foundation of cloud computing, cloud computing is the current stage of computing domain development, cloud computing is the first to redefine "computing" from the beginning. Whether parallel computing, distributed computing, or computing virtualization, computing resources are consolidated or disassembled through software. For most of today's applications, the computing power of a physical server is too great to allow different applications to run on the same server. This "splits" the physical server into virtual servers, each with logically separate CPU, memory, and network resources that can be installed on demand for various operating systems. This dispels the user's concerns, for them, see virtual machines and previous physical machines are no different, is the server. The most successful software-defined computing (SDC) has involved software redefining the server as a hardware device into a virtual device of controllable size. Throughout the history of computer development is from mechanical to electronic, separation to integration, dedicated to general, in the final analysis, from hardware definition to software definition process.

In the history of network development, the prototype of computing network was built by ARPA(Advanced Research Projects Agency) for military in 1969. In the early 1980s, ARPA and Communications Agency of US Department of Defense successfully developed TCP/IP protocol for heterogeneous network and put it into use. In 1986, under the support of the National Science Foundation of the United States Congress, some supercomputers distributed in various places were connected by high-speed communication lines, and ARPANET was replaced by NFSNET; TCP/IP protocol was released in 1974, Fast Ethernet standard was established in 1995, and MPLS Working Group was established by IETF in 1997. Around 2005, the global backbone network infrastructure rose on a large scale, and then after more than ten years of development, the Internet was formed.

The core of network equipment is the processor at the beginning. We all know that the core capability of the processor lies in calculation, not packet forwarding. However, the requirements for the forwarding capability of network equipment are not high at the beginning. With the development of computers and the continuous improvement of networking requirements, especially the development of TCPIP network protocol standardization, users 'requirements for network transmission rates are constantly improving. The forwarding capability of network equipment has gradually become the focus of attention. Therefore, FPGA-based, NP-based (Network Processor), ASIC-based network devices have appeared one after another and are applied to different scenarios.

With the gradual "integrated circuit" of network equipment hardware, network applications have gradually become the focus of more attention from users. If rapid expansion, visualization, forwarding efficiency can be improved again, the security of the whole network, QoS of the whole network, etc. are gradually taken seriously. SDN (software-defined networking) was born.

SDN originated from Professor Nick's Clean Slate project. In 2006, Nick's team first proposed a logically centralized enterprise security solution, opening the door to centralized security solutions. Then in 2007, Nick and his team founded Nicira in Silicon Valley, the first startup in SDN history. In 2011, the Open Web Foundation ONF was born and hosted the Open Web Summit. SDN has only been around for ten years since its birth. It was really applied in the network in 2012 and was deployed in Google's data center.

SDN is a technology that reconstructs the existing network architecture to separate network control and forwarding, forming a logically centralized unified controller, and then opening software programmable interfaces on the controller for service invocation to achieve the purpose of flexible network configuration. Traditional network architecture is defined by switches, routers and other network infrastructure to transmit network traffic, just like highways and railways, the direction of each station to the next station is determined by the ticket you buy, you can not change the direction and distance you want to go. For example, this bus from Guangzhou to Shenzhen must pass through Dongguan, and SDN network, you can customize or network intelligence to determine the destination of traffic, or from Guangzhou to Shenzhen, you can define the transfer from Huizhou, you can define the transfer from Zhuhai, everything according to your definition of network lines.

Although SDN was not born for a long time, it has made great progress. SDN related startups have mushroomed, traditional network equipment vendors have also thrown olive branches to SDN, and major data centers and network operators have carried out technical research and various attempts in SDN, intending to show their hands and feet in the era of SDN. SDN already has a relatively complete technical system support, OpenFlow protocol is an important technology for its implementation. However, due to commercial interests, historical evolution and other reasons, various manufacturers have different understandings of SDN, and the controller software implemented by many large manufacturers can often only control their own hardware devices, which actually violates the original intention of SDN architecture design.

Taiji platform launched by Taixintong, a leading SDN enterprise in China, adopts standard OpenFlow protocol to manage mainstream SDN switches. At the same time, it can also interface with multi-vendor network hardware equipment, truly realizing software and hardware separation. Users can obtain more choices when purchasing hardware boxes. At the same time, traditional network equipment can be managed to achieve smooth evolution from traditional networks to SDN networks, minimizing user costs. The network store of Taiji platform, based on the flexibility of SDN, can realize the effect of online upgrade of SDN devices, ensure that users purchase devices are no longer eliminated due to network development, and support for new protocol and new functions is as convenient as upgrading mobile apps.

Telcom believes SDN technology has become the first choice for the core technology of the next generation network due to its openness and flexible deployment and programming capabilities. SDN-based network virtualization technology can realize the virtualization of physical networks, similar to computing virtualization technology, greatly improving the end-to-end service delivery speed, simplifying network operation and maintenance, and also meeting the demands of telecom operators for reducing network costs and improving service innovation speed. Therefore, adhering to openness, integration and intelligence is the SDN principle that Taixintong has always adhered to.

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