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SDN: The core building blocks

Ethan Banks, owner, Packet Pushers Interactive | July 1, 2013
When getting to know software defined networking, you'll encounter a number of terms that are used in conjunction with the technology. Some of the terms are unique to SDN, while others describe technologies that, while not unique, are frequently used in SDN designs.

The southbound protocol most often used is OpenFlow, but challenges retrofitting OpenFlow to existing network hardware has led vendors to promote network programming via APIs.

On this platform of network programmability and physical device abstraction is added overlays. Overlays allow cloud providers and enterprises that wish to support multitenancy to securely separate their customers' traffic one from another, while at the same time allowing their virtual hosts to reside anywhere within a data center.


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