Analyze SD-WAN technology, the future of enterprise-wide WAN!

As a subdivision of Software Defined Network (SDN) technology, Software Defined WAN (SD-WAN) is undoubtedly one of the hottest technologies in enterprise-wide WAN layout from 2015 to the present. As a rapidly emerging new technology in the field, SD-WAN combines software programmable and commercial hardware to provide automated, low-cost, high-efficiency WAN layout services that greatly replace the traditional WAN layout technology.

According to foreign market research firm IDC, SD-WAN can save at least 20% compared to traditional enterprise WAN solutions. By 2020, the SD-WAN market will exceed $6 billion. Gartner, a US information technology research and analysis company, has adopted SD-WAN services and SD-WAN products as one of the hotspot technologies in the technical curve released at the end of July this year, and predicts that it will be commercially available in the next two to five years.

As the future star of enterprise-wide WAN, what kind of technology is SD-WAN?

At present, major operators such as AT&T, Verizon, SingTel and NTT, Cisco, Nokia and Juniper are also actively deploying SD-WAN technology, hoping to connect on the network infrastructure. Based on the service, we will make full use of the existing business strength and launch new products based on SD-WAN technology as soon as possible, occupying a place in the fast-growing SD-WAN market.

So what are the advantages of SD-WAN, can the industry be optimistic about it? This is also from what exactly SD-WAN is.

As shown in the figure, in the traditional enterprise WAN layout, branches and headquarters need to establish links through the Internet or dedicated lines to realize services such as shared data, E-mail and Web applications. In this way, if data interaction is all distributed through the public Internet, it will greatly affect the transmission efficiency and cause response delay. If the combination of the Internet and the dedicated line is adopted, it is easy to cause imbalance in service distribution. If all the special lines are used, it will cause an exponential increase in the cost of erection, which is unacceptable to ordinary enterprises.

As the future star of enterprise-wide WAN, what kind of technology is SD-WAN?

One thing that can't be ignored is that in this case, the gateway of the branch office as a client needs to add complex Customer Premise Equipment (CPE equipment), which usually includes WAN optimization, firewall, VPN and network value-added services. The configuration management of this traditional gateway is complex and requires professional maintenance. Of course, many SMEs now choose to use private cloud services, which is to put headquarters data in the public cloud. This method requires data communication through the public Internet, and network quality cannot be guaranteed.

As shown in the figure, in the current common SD-WAN application scenario, the Internet and dedicated line coexistence are adopted. By introducing the SD-WAN controller, centralized management and automatic configuration of the branch CPE devices are completed, including various Configuration management of Internet access and private line access. SD-WAN can provide visualization of enterprise WAN and applications, and provides intelligent routing function. It can intelligently dispatch data of various applications to their respective links based on the real-time status of the network environment, ensuring efficient distribution and communication. real-time. Moreover, the SD-WAN controller can be flexibly deployed on the enterprise side or in the cloud.

As the future star of enterprise-wide WAN, what kind of technology is SD-WAN?

SD-WAN, an intelligent and adaptive network structure, reduces the operating costs of WANs on the one hand, and adds flexibility and mobility to network service upgrades, relocations, and demand changes, especially for network services. For those large-scale enterprises that are geographically diverse, they have become a hot spot in enterprise-wide WAN technology.

However, as a new technology, SD-WAN itself has certain limitations, and it is not equally attractive to all enterprises.

As part of an enterprise IT network, SD-WAN needs to be deployed as an organic whole with corporate headquarters, branch offices, various LAN interfaces, enterprise private clouds and data centers, and other applications in enterprise IT networks. However, the current situation is that each SD-WAN supplier has its own battle, and the solution provided cannot form a unified standard, which has caused a certain degree of obstacles to the operation and coordination of the network and the promotion of the technology itself.

On the other hand, there are many companies in the reality that the enthusiasm for SD-WAN is not as high as expected. Some of the respondents even expressed concern about the reliability of the technology under the traditional Internet protocol and the occupancy rate of the bandwidth.

At present, with the continuous increase of network access bandwidth and backbone capacity, the demand for mobile Internet access by enterprises, terminals and data centers is increasing, bringing about the transformation of the traditional WAN market. SD-WAN technology is the representative of this change. It provides a simple and efficient WAN implementation, which is sought after by most practitioners. In the future, with the further improvement of network access technology and access requirements, the field of WAN deployment represented by SD-WAN technology will surely usher in greater development.

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