Chapter 3
SDN implementation
3.1 Introduction
Software-defined networking (SDN) can be regarded as a set of abstractions governing how the control plane in a modern network is specified. SDN is not a set of mechanisms, as SDN can be implemented in a number of different ways. Although much of the discussion about SDN involves the OpenFlow interface to the physical network’s switches, OpenFlow should be thought of from a technical viewpoint as the least-interesting component of SDN.
Unlike today’s distributed network routing protocols, SDN can be thought of as simply computing a function. SDN computes functions on an abstract view of the underlying physical network. This allows SDN to ignore the detailed physical infrastructure that has been used ...
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