This article is intended for network architects that want to design Software-defined Wide Area Networks (SD-WANs) to connect on-premises facilities with each other and with Azure. It describes an architecture that lets Azure customers use their existing investments in the platform, by building efficient, global SD-WAN overlays on top of the Microsoft backbone.
https://learn.microsoft.com/en-us/azure/architecture/networking/guide/sdwan-integration-in-hub-and-spoke-network-topologies
