Understanding the software-defined network architecture
Azure Stack Hub network resource creation is consistent with Azure, as it brings the power of the new Microsoft software-defined networking stack to Azure Stack Hub. Azure Stack Hub's software-defined networking (SDN) embraces industry standards such as Virtual Extensible LAN (VXLAN) and Open vSwitch Database (OBVSB), and incorporates technologies directly from Azure such as the software load balancer (SLB) and Virtual Filtering Platform (VFP) vSwitch extension, which is proven to be reliable, robust, and scalable.
Azure Stack Hub SDN leverages investments in Windows 2019 such as Packet Direct, switch embedded teaming (SET), converged NIC, offloads, and many others to provide software-defined networking capabilities at cloud scale.
Each component in Azure Stack Hub has its own set of virtual IP (VIP) addresses. The following diagram shows this, with each arrow representing a set of VIPs in Azure Stack Hub: