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Concretely, with the SDN, a software interface must allow to orchestrate a physical network, that is to say, to direct the flows, to modify the bandwidth, the rules of a switch, etc. All without having to access the material, and possibly dynamically. In an SDN architecture, the control plane is thus decoupled from the data plane. The promise of the SDN Software Defined Network is to simplify and optimize the management of the network. The SDN must also allow flexibility in the design, construction and operation of networks. The SDN must in fact bring the same agility to the networks as that brought to the servers by virtualization", indeed compares the US firm. A network machine is a complicated computer: it has a data plan, which includes all the hardware that transfers data between ports, and a control plan, which includes software that decides what to do with data.
Users interviewed by this firm cited many other motivations, more concrete: better management and visibility, optimization of the capacity of their networks, improved performance of their applications, reduction of their expenses on hardware and software but also expenses of functioning related to the operation of the networks. OpenFlow is a communication protocol that provides access to the data plane. This is one way, among others, that allows to set up the SDN. Many network hardware providers support it.
Managing network machines on an industrial scale is a nightmare. These are important, specialized and expensive pieces that represent a headache for companies. One of the new buzzwords in the technological world is the Software Defined Network ( SDN ), presented as an innovative way to simplify networking.
The life of a network administrator is an endless cycle of thought, tedious work, setups, upgrades, and replacements. For businesses and operators, it is an expensive activity. Networking has not experienced the equivalent of the PC revolution to trivialize hardware, offer a choice of operating systems, and create a market for competing applications. All network machine manufacturers have developed very complicated and highly incompatible systems. When you bring all this network administration back to the level of an operator (telecom companies are by far the biggest buyers of network machines), you can imagine the huge investment in time and money that it takes. The SDN Software Defined Network was initially a way to open the control plan so that administrators could try to change protocols for better results. It then turned into a promise to greatly relieve this incessant cycle of thought, tedious work, configurations, upgrades and replacements.
The approach of the SDN is centred on a rather simple idea: to make the control plan more flexible. The idea is to get network machines that act more like unmarked PCs. You can feel the benefits of this new approach in the world of cloud computing. If you created a firewall and load balancer, you ran a cloud provider's own SDN system. There may be a network appliance or an expansion card in a switch, somewhere behind the scenes, but when you change the configuration of a firewall or load balancer, you are working with control software, and not with material.