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Software Defined Networking with OpenFlow by Siamak Azodolmolky

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Building Blocks

The SDN switch (for instance, an OpenFlow switch), the SDN controller, and the interfaces present on the controller for communication with forwarding devices, generally southbound interface (OpenFlow) and network applications interface (northbound interface) are the fundamental building blocks of an SDN deployment. Switches in an SDN are often represented as basic forwarding hardware accessible via an open interface, as the control logic and algorithms are offloaded to a controller. OpenFlow switches come in two varieties: pure (OpenFlow-only) and hybrid (OpenFlow-enabled).

Pure OpenFlow switches have no legacy features or on-board control, and completely rely on a controller for forwarding decisions. Hybrid switches support OpenFlow ...

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