Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. OpenFlow is a communications protocol that gives access to the forwarding plane of a network switch or router over the network. In simpler terms, OpenFlow allows the path-of-network-packets-through-the-network-of-switches to be determined by software running on a separate server. This separation of the control from the forwarding allows for more sophisticated traffic management than what is feasible using access control lists and routing protocols. Its inventors consider OpenFlow an enabler of "Software Defined Networking". OpenFlow has been implemented by a number of network switch and router vendors including Brocade Communications, Arista Networks, Cisco, Extreme Networks, IBM, Juniper Networks, Hewlett-Packard, and NEC. Some network control plane implementations use the protocol to manage the network forwarding elements. OpenFlow is mainly used between...

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