Software Defined Wide Area Networking (SD-WAN) is bubbling up to be one of the prime use cases of SDN. The vendors that fall into the SD-WAN bucket often include Glue Networks, Nuage, Viptela, CloudGenix, VeloCloud, etc. As you dive into each of the solutions from the vendors, you may realize that some are truly unique technologically and some may just be offering a better way to manage existing wide area networking equipment (which is still a huge value add).
Jason Edelman, Founder of Network to Code, focused on training and services for emerging network technologies. CCIE 15394. VCDX-NV 167.
The Future of Networking and the Network Engineer