If you mention SDN in data center technology, now almost no one knows it. This is a typical representative of the new generation of network technology, and many people are crazy about it. It has been 12 years since SDN was introduced at Stanford University in the United States in 2006. Among them, before 2011, it was basically the stage of SDN technology concept and continuous improvement. In 2011, ONF was established, which was intended to promote the specification and development of SDN architecture and technology, and gradually standardized the SDN technology system. As we all know, SDN is just a network theory. The technology that supports SDN implementation is Openflow technology. Until August 2013, the Openflow standard was approved by the ONF and officially released. Soon, the United States deployed SDN on the Internet of the University, Deutsche Telekom also began to develop and deploy SDN, Google's backbone network fully runs OpenFlow, distributed through 12G network links in 12 data centers around the world, these practical cases will quickly SDN Technology is on fire, and data centers around the world have followed suit and launched a boom in building SDN networks.
The changes brought by SDN to the network are huge, especially the separation of control and control, which has almost changed the operating rules of traditional networks for decades, and also changed the original thinking of people using and operating the network. Accepting SDN and understanding SDN requires a process, so these years have been in the process of incubated SDN technology, there is rarely a SDN data center network, until 2016, SDN landing, especially in some Internet data centers The network has been deployed one after another, setting off a wave of building SDN networks. In the past two years, the introduction of SDN on the network strategy has become a must for the data center, just like cloud computing a few years ago, not to mention the cloud is embarrassed, all OUT, deployment of SDN has become a data center construction A trend, however, this situation has changed in the past six months, some data centers have begun to abandon SDN, or try to deploy SDN only in a small part of the network, as an experimental network technology exists. The reason why this happens: First, the maturity of SDN technology itself is not enough. Although there are ready-made standards, there are differences in the implementation details of each manufacturer, which causes problems between controllers of different manufacturers and network devices of different manufacturers. For this reason, the data center can only select the controller and hardware devices of the same manufacturer, so that the data center network is bound with one network manufacturer, and the risk is too large, especially the bargaining power. Obviously, the data center does not want to do this, and promotes SDN deployment. The willingness is not strong enough; the second is that SDN technology needs new network equipment to support, there are many network equipments in the data center, and there is a process of phasing out. At least for a few years, such a network environment does not have the basis for deploying SDN. The stock network, the newly built network is a minority after all, the equipment that chooses to support SDN is naturally higher than the traditional network equipment, and the input cost is higher, which is contrary to the SDN technical purpose; the third is the small data center network, once After the deployment is completed, the opportunities for expansion and change are relatively few, and the manual operation is not complicated. Overkill, the real benefits to the data center is not right, even those large data center networks, expansion of several network equipment, a skilled network engineer can also be completed quickly, not much slower than the SDN way, SDN is automated Deployment, but it is also difficult to troubleshoot the problem. The Underlay and Overlay network levels should be checked, and the complexity of the network problem increases. Fourth, once SDN problems, often affect the overall situation, the entire network may be paralyzed, which is more powerful than the traditional network, SDN is not a problem, once the problem is catastrophic to the data center, in SDN technology When the maturity is not high, many data centers are not willing to be regarded as mice, try first, and a variety of other reasons, which makes the SDN construction boom that has been set off slowly cooled down again. Try to wait and see.
From the perspective of SDN network vendors, SDN technology has always been used as a new technology, and it is bundled with traditional network hardware devices. There are not many data centers to purchase SDN software alone. Network vendors promote network devices by providing SDN solutions. Sales, in order to increase the price of equipment, the real purpose is to rely on SDN technology, continue to vigorously sell hardware, make money through hardware, SDN software is a value-added service. In the case that SDN has not been widely recognized, especially since now, there has been a lot of pessimism, and SDN is not as good as a separate software technology. However, various manufacturers have invested heavily in the technical research of SDN, especially in the design and implementation of SDN controllers, which has invested a lot of manpower and material resources, and will continue to increase investment in the future, facing the cold reception in the market. I am also trying to overcome it and hope to survive the storm. SDN technology itself is advanced and is also the trend of future network development. However, if it is not fully practiced, it will not be recognized by the data center, and may eventually face the crisis of elimination. In the past, the cluster technology was hot, and the STP and VRRP technologies were more classic. They were not slowly eliminated and became history. As long as they do not meet the needs of business development, even the best technology may be eliminated. "Practice is the only criterion for testing truth." Only by withstanding the test of practice can this technology be qualified and widely used and widely used. During these 12 years, SDN technology has experienced many stages of questioning, acceptance, enthusiasm, and doubt. Whether it can be widely recognized and used in the future remains to be tested.
After a period of development, SDN technology slowly calmed down. People began to rationally treat SDN, no longer blindly pursued. In fact, this is very beneficial for the development of SDN technology. It is not necessarily an advantage to develop too fast. The defects are fully exposed as soon as possible, and the opportunity can be improved. Such technology can continue to grow and gradually become commercial. "I can't eat hot tofu", although the current SDN is a bit embarrassing, but has not been abandoned, there are still many people who are very recognized about this technology. It is only when the technical theory is in line with reality that it does not reach the height expected by people. Some people have some ideas and doubts about SDN technology, which is a normal reaction. The network construction of SDN is still in the orderly advancement. Although it is not as crazy as the previous two years, the pace of construction has not stopped, but it has become more rational in the network construction of SDN. After fully evaluating the existing network, and then considering SDN, and to what extent SDN is to be implemented, such development is more beneficial to the data center.
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