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Software defined network

2018-10-22 来源: 51due教员组 类别: 更多范文

下面为大家整理一篇优秀的assignment代写范文- Software defined network,供大家参考学习,这篇论文讨论了软件定义网络。软件定义网络是美国斯坦福大学提出的,它是以Open Flow为基础,为了建设网络的创新平台而设计的。目前的软件定义网络技术还非常初步,在体系结构上、协议上和硬件上都有很大的开拓空间。但从软件定义网络的发展来说,真正困难的是对网络的理解,网络的顶层设计。

Software defined network,软件定义网络,assignment代写,作业代写,美国作业代写

The assumption of software-driven network is quite reasonable, that is, interfaces are required between the business layer and the transmission layer for mutual control, and each interface is the network northward interface as described in SDN. On the surface, the northbound interface problem seems easy to solve. In fact, it's not hard when the network is small. But as the network grows, so does the problem. All of the current approaches have serious scalability issues that are not really practical. Due to genetic defects in the mechanism, it is difficult to make the northward interface. The vast majority of SDN application scenarios proposed at present belong to this category, which is generally effective for local and small scope, but it is difficult to achieve when the scale is large. Separation of control and forwarding is only one of the features of SDN, not its main feature. Separation of control and forwarding has both advantages and disadvantages. Generally speaking, centralized control is not much, poor expansibility is a common problem. Its applicable scenario is: transform existing network, simplify network operation and improve network performance.

"Most of the movements that a duck makes while swimming are done underwater, and these movements are not easily observed," one person said. The sturdy feet glide across the water, propelling the ducks forward, which is similar in many ways to a software-defined network. In this way, the author's views on SDN are expressed. The common Chinese saying, of course, is: "a duck can do everything, but nothing is good." The duck mentioned in the preface of this book leaves a wide space for readers to imagine SDN.

Opinions on SDN differ greatly in China. Highly optimistic about SDN, think it is the savior of the network industry and can bring earthshaking changes to the network; SDN is generally regarded as a local technology which contributes to network optimization. There are also totally negative SDN, think it is a network in the packaging of a hype. Of course, all of these opinions are valid and start from their own expectations. I'm bullish on SDN. Recently, SDN can be used to transform the network within the local scope, optimize the network structure and improve network performance. In the long term, SDN can be a potential implementation technology of network innovation.

The current SDN technology is still very preliminary, and there is a lot of space for exploration in architecture, protocol and hardware. But from the development of SDN, what is really difficult is the understanding of the network, the top-level design of the network. Opportunities and challenges coexist in SDN, and opportunities are greater than challenges. Therefore, we must be clear about the direction, get rid of blind thinking and firmly follow our own path.

SDN is an important pillar of network architecture, as is NFV. As more open and interoperable infrastructure and solutions are rapidly adopted, we will also see multiple platforms and communities emerge based on these architectures. In this transformation of the Internet, SDN is clearly not an independent technology. SDN, NFV, and cloud service choreography are now bundled together to deliver as services and solutions. The deployment of routing and signalling protocols, automation as a viable technology, and the operation of long-deployed control plane software applications such as SDN have been in great demand. Although it's a "" hybrid" "network in the words of SDN, in reality this is the norm. The SDN and programming interfaces currently under discussion are being gradually normalized at all levels of the traditional network, with a large amount of work focusing on the areas of transmission, lines, service access, and routing and MPLS. The combination of flu-awareness technology and civilian and commercial services has produced many exciting results! Communities and standards organizations have accelerated the transformation and are working on resource management and modeling, failure and performance analysis and even comprehensive analysis, as well as empirical assurance and harmonization arrangements for wan and access networks. On that basis, the industry's next priority is clearly to move from testing to actually deploying the product.

What has changed is that data centres are not the only talking point. Not everything will go to big data centres. The world will be "" cloudy," "and those clouds will vary by network topology shape and distance, the overhead of transmitting bits, laws and regulations and new data distribution rules, as well as by country and industry, as privacy and security are at the center of the world. In addition, enterprise IT departments are accustomed to using programming interfaces and controllers. High efficiency, utility, time saving, one-click service deployment and SLA guarantee application in multiple environments are valued by enterprises. University campuses, branches, small and medium-sized enterprises and consulting agencies are taking advantage of SDN. This year has changed so much!

One theme that has not changed is that open, interoperable components and architectures will create new markets for service and content providers and businesses. Then we saw that virtual services, which used to take weeks to build and deploy, can now be completed in a matter of minutes as new products enter different locations in the network, creating new markets. What I'm really looking forward to is the combination of technology and business, which used to be fragmented, and now coming together to create new markets. For example, video services in mobile networks, shopping pusher-style on-demand deployment security features, and real-time collaboration technology, no matter what content, what devices, how to access and where. New interfaces and portals connect these services to end users, and the SDN and NFV that are being deployed by the network industry make this possible, and simpler and more automated.

Open source has clearly become a new way of setting standards. More individuals, businesses, service providers, partners, suppliers, and users can participate not only by brainstorming, but by leveraging these open source solutions and making the ecosystem and solutions more open. The more participants, the more open the ecosystem and the solutions it produces. The result is faster, more stable solutions developed by multiple communities, all based on SDN, NFV, and cloud service choreography. Of course, this year and the future, the sandbox will accelerate, and new BBS, industry alliances will emerge.

The new ecosystem is driving more service aggregation, spawning startups and new personalized software platforms and cloud environments. New SDN and NFV cloud platforms must be programmable, robust, open, interoperable, virtual and physical, capable of reliably combining the access network with the cloud. This is where all of us need to go online.

The appearance of SDN may cause the observer to think rashly as follows. First, defining what SDN is or may be is a wild attempt by many agencies to rescue their business plans or revive their standardization organisations. Second, SDN is merely a rebranding, attaching to existing products the "magic" they do not have. Many manufacturers claim that the product they developed four or five years ago is the source of SDN, so what they have done since then is SDN.

Along with this line of thinking, the act of re-labeling everything with SDN and the propaganda of a large number of SDN startups in the past three or four years further strengthen people's negative view. If observers are dismissive of SDN because of its online beliefs and political stereotypes, then SDN looks like a wonky idea.

There is solid evidence that SDN eventually led to a discussion about the programmability of the network, the control model, the modernization of network-oriented application interfaces, and the virtual openness of these things.

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