Basic mechanism of SD-WAN
In general, companies build WANs using leased lines, broadband lines, and mobile lines such as LTE / 3G.
In SD-WAN, while using the above-mentioned physical line as an underlay line, a virtual WAN configuration by overlay is realized regardless of the line type.
This eliminates the so-called "carrier binding" and allows you to freely select the main line and backup line from a wide variety of physical lines such as lines and mobiles by multiple carriers to configure a corporate WAN.
In addition, the same virtual overlay network can be centrally managed both in Japan and overseas, which can be expected to reduce the load on WAN operation / management.