Start-up Cumulus Networks this week has emerged with a Linux network operating system designed for programmable data centers like the ones Google and Facebook are building. The company’s Cumulus Linux OS operating system includes IPv4 and IPv6 routing, plus data center and network orchestration hooks. Much like OpenFlow for independent, software-defined control of network forwarding, Cumulus Linux is intended to run on commodity network hardware and bring open source extensibility to high capacity data centers.