What is SDN?

What exactly is SDN? Although the concept has been fired for many years, no one has yet given a clear idea of it. On the internet also emerged a lot of excellent articles on Sdn thinking, adhering to the "do high-quality content porter" idea, Sdnlab June collected some of the following articles to share with you. Make it possible to have a more stereoscopic understanding of SDN from a number of different perspectives.

1. Think deeply about the core nature of SDN: Back to the software-defined network from Sdn=openflow
Author Centec Zhangwei @ Centec Zhangwei, in the Sdn field, Weifeng always have a deep thinking, this article mainly talk about the nature of SDN, in fact, many people touch Sdn are very tangled in the combination of this word, as the name implies, but can not determine whether their thinking is correct, Weifeng has authored four stages of his own understanding of SDN: Three essential attributes from Sdn=openflow to SDN, to the narrow SDN, Generalized SDN, and Hyper-generalized SDN, and the last phase back to the SDN literal software-defined network. Perhaps this article can solve many of the problems of the small partner that tangled the SDN concept, but is his value alone?

2. The practice and thinking of Sdn Landing: Find a solution with a problem, forget the definition.
This is also the Weifeng total works, echoing the core essence of the previous article, wrote about the SDN landed on the thinking, analysis of the application of SDN in different areas of the case, summed up some of the resistance of SDN, and specifically for the openflow limitations of the analysis, and finally put forward their own recommendations for SDN landing. Weifeng Total wealth of work experience and knowledge so that this article is absolutely dry goods in the dry, remember to read more water oh.

3. Openflow/sdn Nature Theory
Author Wang Jun is the chief engineer of the system architecture Department of ZTE ZTE Center Research Institute. The article is divided into three parts: the requirements and driving force of SDN, SDN ESSENCE, SDN game. "SDN is not magical at all, it is a necessary requirement from the IT domain, and it is an inevitable trend for it to become more and more hardware-based software to gain functional flexibility in the past more than 60 years." Although the article was written in 2012, it is still of great reference value.

4. Rethinking SDN
This article is also from Wang Jun, introduced the two implementations of SDN-OpenFlow Full control of the network architecture and some manufacturers to launch the device programmable architecture, analysis of the pros and cons of the two methods, and combined with the industry chain game to the application of the SDN scenario is analyzed, Finally, the application value of Data Center SDN is emphatically introduced. The author makes a dialectical analysis of SDN from definition to implementation from a technical point of view, and must not be missed.

5. Sdn Elephant
The author is the Nanjing stack strontium Yang Zewei @ Yang Zewei-MESHSR, "technology can be thought in a philosophical way", "to maintain the focus of SDN learning/research, to maintain the sensitivity of the various technical directions", the essential properties of SDN must be positioned, "If anything is SDN, then SDN is Nothing", "SDN Architecture: a PC-like open tiered architecture, data plane is progressively generalized, and control plane is separated from the data plane to get rid of the previous protocol (function) stack, abstraction and implementation (logically) centralized , layering again inside the control plane: Nos and apps. Such wonderful content is indeed worth reading.

6. All right, SDN
Author @ kkblue, the conceptual content of SDN, does not carry out the semantics. As a pragmatic and outstanding representative, KK has a lot of advice to meet the small partners of SDN, read the article will not look at the head of the technical article to see the big feeling, although no voluminous of the introduction of SDN, but to understand all get to. As the article said, "Rational view of SDN, we must maintain a calm attitude, do not think that the revolution, you can get rid of the tradition, all sdner are in the belief that SDN does change the status quo, but, if you say that change what, you have to say understand?" "And looking at this series, you might have a clearer idea of how to learn SDN and rationally look at SDN, which is worth reading," Don ' t wait.

7. SDN and NFV?
Author @ kkblue, with "for the human secluded couplets, the language does not surprise death endlessly" this sentence to describe Kkblue God's style of personal feeling more appropriate, may be a master is so, can be esoteric technical problems with such humorous statement expressed, perhaps as KK said "Tangled in the concept, Just the primary stage of learning, it is better to understand how to achieve the effect and the future development, seems to have some help for themselves. "

8. Jane Books SDN & NFV series articles
It is understood that the author is a research and development expert from Bigswitch, Wu Xin. He has a very unique understanding of SDN, that "any Internet bottom-level innovation is top-down", "those who make traditional networks stretched new requirements", "What is the SDN controller doing", "SDN in the physical switch", "Proactive vs. Reactive", " Another big pit: The SDN App Store, several articles expressing the author's own view of SDN in humorous and humorous statements.

9. About SDN
The author summarizes the characteristics of SDN as hardware standardization, software platform and Information Center. Based on the analogy of PC ecosystem, the present situation and problems of network equipment development are analyzed. From the analysis of the characteristics of the information center, the advantages of SDN compared with traditional networks, he thinks that the centralized control of SDN can make many network problems simple, and lists some applications of Sdn.

SDN FAQs
This article, in question and answer, sums up some common questions about SDN and is valuable for understanding Sdn.

11. Pro, what can we do for SDN?
Author @ beijing-Xiao Wu, everyone is talking about SDN technology, but what can we do in SDN? Or is it noble to say what we can do for the development of SDN? Let Xiao Wu tell us what we can do for SDN, perhaps to find some research points.

SDN, please don't confuse me.
Author Pica8 Jia Yanmin @ Jia Yanmin, perhaps because of the explosive spread of Internet information, so that Sdn from the date of birth into the network has been a popular conversation, the application of SDN does not seem to get mad bland, the first half of the article from three aspects of the analysis of its reasons: SDN is a mode migration (PARADIGM Shift), the implementation of SDN is facing many challenges, and the evolution of Network to SDN (migration) is not yet a viable and inexpensive solution. Then the application of SDN put forward their own four points of view: Not superstitious SDN, not for SDN and SDN, the use of open source (open source) of the power to do the spirit of Internet products to do Sdn. Although this article does not devote much effort to explaining what SDN is, it is absolutely valuable for thinking about SDN applications.

Think of recently in a foreign site Searchsdn saw a topic about SDN, from Open, api-based, overlay-based three angles to the SDN explained. One of the words "which is the real SDN?" That depends to whom you ask – but based on current usage by the population at large and they all is. " Here's a free link: What's ' real SDN '?

Article written here do not know as a reader you have a clearer understanding of SDN, thank you very much for the internet to let Sdnlab to so many high-quality articles, but the limited personal ability, there are many high-quality articles have not been able to dig out. If you have a better article recommendation, you can and Sdnlab June or fat Aubagun contact @sdnlab, @ Fat Aubagne Flyye, this article will continue to improve the rich, if there is a wrong place also please criticize correct, welcome everyone to Polish.

What is SDN?