Research on Future Internet and Contents Delivery
Mazliza Othman · Kyushu University Institutional Repository (QIR) (Kyushu University) · 2014
Software Defined Networking (SDN) is an emerging topic that tracts attention due to its paradigm, that splits the control plane from data forwarding plane.According to which, the control plane is realized as the network operating system, which is responsible for controlling maintaining the state of the whole network.While the data plane is realized as the network equipment or devices that carry out instructions from the control plane and forwards the data packets.Where, SDN have defined OpenFlow as "key enabler for software-defined networks and currently is the only standardized SDN protocol that allows direct manipulation of the forwarding plane of network devices".OpenFlow was first introduced in 2008, as a part of Stanford University's clean slate project.OpenFlow provides a specially designed way to control flows on the network equipment by the OpenFlow controller (control plane) through using the OpenFlow Protocol, and splits that from the data plane (network equipment).According to OpenFlow; decision making can be done and modified freely by the OpenFlow controller according to layer 2, 3, VLAN, and layer 4 headers while the forwarding is still done by routers or switches, in addition to, their original functionality.Moreover, OpenFlow defines actions to be performed on flows that can be either collection of statistics or usage data, forwarding packets, dropping packets, or manipulating packet's headers.Thanks to the flexibility provided by OpenFlow and SDN, many researchers embarked on providing new smart applications like; a virtualized network infrastructure, detection of DDoS attacks, measurement-aware routing, supporting QoS, run-time programming for network to support big data applications, and many others.It is believed that large number of new applications will be proposed to enhance the operation of current technologies and to provide even new applications.