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 to the Envoy proxy was: API Gateway, Policy Agent for L7/L4 policy enforcement from our SaaS, WAF, enhanced metrics (over 20+ from standard 5 Envoy collects), optimized the hell out of the data path with native DPDK, and added customization of the data path with native v8 Chrome Javascript support.
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