SD-WAN does not depend on SDN technology, and uses a wide variety of technologies to convert the entire corporate network, including the WAN, into SD. In recent years, the term "SD-WAN" has appeared frequently in the media. This is an abbreviation for Software Defined-WAN. ITR defines SD-WAN as "a technology that enables dynamic on-demand control by software for corporate bases and networks connecting a wide variety of devices." SD-WAN does not refer to SDN or any other specific technology, but to a group of network solutions for solving the above-mentioned operational management issues of corporate networks.

Specifically, what kind of thing is called SD-WAN? ONUG (Open Networking User Group), a community of many major user companies aiming to open networks, summarizes the technical requirements for SD-WAN (Fig. 3). Of these, 2 and 6 are important items for network service providers or vendors, so user companies do not need to pay much attention. The remaining eight items are very important points in the corporate network, and if these can be met, various networks such as WAN / Internet / mobile lines can be used seamlessly, and the above-mentioned corporate network operation management Various issues will be solved and the network preparation period will be shortened.

How SD WAN works