If I were to more accurately describe SDN based on my experiences in the networking industry, I would define it more broadly. Instead of defining SDN as a specific solution (such as OpenFlow), I define SDN as a highly automatable and programmable network infrastructure.
What SDN providers exist today?
- OpenFlow: Many companies and communities drive OpenFlow solutions, but today there is no guarantee any one solution can interoperate with any other.
- Proprietary or vendor-specific: Solutions such as Cisco’s ACI and Juniper Contrails are closed solutions that are positioned as SDN. Arguably, certain OpenFlow solutions can fall under here as well since they don’t all adhere to an OpenFlow standard.
- Network virtualization with technologies like VXLAN. Cumulus Networks believes that network virtualization (VMware NSX, Midokura MidoNet, Cumulus Networks EVPN, and even Open Contrail) is the way forward for this type of SDN. To learn more about network virtualization, refer to our documentation on the subject.
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