Quantum is an application-level abstraction of networking that relies on plug-in implementations to map the abstraction(s) to reality. OpenFlow-based networking systems are one possible mechanism to be used by a plug-in to deliver a Quantum abstraction.OpenFlow itself does not provide a network abstraction; that takes software that implements the protocol. Quantum itself does not talk to switches directly; that takes additional software (in the form of a plug-in). Those software components may be one and the same, or a Quantum plug-in might talk to OpenFlow-based controller software via an API (like the Open vSwitch API).
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