SD-WAN is a new trend in network technology

Although SD-WAN is a new trend in network technology, there are quite a few research reports on it. According to Gartner’s 2015 report, Predicting SD-WAN Adoption, although less than 1% of enterprises use SD-WAN in 2015, 30% of enterprises will use SD-WAN technology by 2019. The Dell” Oro Group reports in both 2016 and 2017 that the SD-WAN market will grow at an annual rate of 33%. In 2016, this market is 300 million US dollars, and by 2021, this market will reach 1.3 billion US dollars. Citrix is ​​more optimistic that the SD-WAN market will reach $6 billion by 2020. In the SD-WAN field, venture capital for the corresponding startups is also huge. According to a report by Rayno Report research, more than 360 million US dollars of venture capital has been given to SD-WAN startups. Not long ago, Cisco acquired SD-WAN company Viptela for $610 million.

It seems that this is a very rich direction, this article will introduce what is SD-WAN from the perspective of technology and products.

WAN

Before understanding SD-WAN, let’s review what is WAN? It can be understood literally, the Wide Area Network, which is commonly referred to as the WAN. This is a telecommunications network or computer network that covers a long distance, usually built by renting telecommunications lines. The longer distances here can be across regions, across countries, and even the world. From the perspective of computer network protocols and concepts, WAN is concerned with computer network technology for long-distance data transmission. This technology is applied between LAN (Local Area Network), MAN (Metropolitan Area Network) and other local computer networks, enabling these local networks to connect into a connected wide area network. The figure below is a WAN diagram consisting of multiple MANs.

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