Explore the Virtual Filtering Platform (VFP), a programmable virtual switch powering Microsoft Azure, in this 27-minute conference talk from NSDI '17. Delve into the design, API, and flow language of VFP, which supports host networking for implementing VM network policies such as tunneling, NAT, stateful ACLs, and QoS. Learn about its goals, including multi-controller support, connection-based policy, efficient caching and classification algorithms, and NIC offloading. Discover performance results and insights from VFP's deployment on over 1 million hosts running IaaS and PaaS workloads in Azure for more than four years. Gain valuable knowledge about scalable cloud networking architectures and the challenges of implementing host SDN in public cloud environments.