https://www.volterra.io/resources/blog/apps-are-becoming-distributed-what-about-your_infra 這點又要回到技術咖的觀點 Layer 3 (Routing, Firewall) — we took hardened open source projects. Tungsten Fabric (formally known as Contrail SDN) is used by Tier 1 Telcos around the world for delivering key Mobile Packet Core NFV functions. It has a centralized control plane with a distributed data plane for network security and firewalls. We’ve taken FRRouting (Free Range Routing) for a rich set of routing protocols needed for traditional CE route exchange. We’ve added additional functionality to be a SaaS-based software stack; zero-touch provisioning (ZTP) and portability across most environments (Public Clouds, Private DCs, Edge Devices, etc.). Layer 7 (load balancer, proxy, WAF, API gateway, app security) — we built off the great work of the Envoy project since it’s highly performant and lends itself to production needs with its modularity and dynamic configuration updates. What we added in addition