SDN ( Software Define Networking)
Software-Defined Networking (SDN) is an approach to networking that uses software-based controllers or application programming interfaces (APIs) to communicate with underlying hardware infrastructure and direct traffic on a network.
This model differs from that of traditional networks, which use dedicated hardware devices (i.e., routers and switches) to control network traffic. SDN can create and control a virtual network – or control traditional hardware – via software.
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Different models of SDN
While the premise of centralized software controlling the flow of data in switches and routers applies to all software-defined networking, there are different models of SDN.
- Open SDN: Network administrators use a protocol like OpenFlow to control the behavior of virtual and physical switches at the data plane level.
- SDN by APIs: Instead of using an open protocol, application programming interfaces control how data moves through the network on each device.
- SDN Overlay Model: Another type of software-defined networking runs a virtual network on top of an existing hardware infrastructure, creating dynamic tunnels to different on-premise and remote data centers. The virtual network allocates bandwidth over a variety of channels and assigns devices to each channel, leaving the physical network untouched.
- Hybrid SDN: This model combines software-defined networking with traditional networking protocols in one environment to support different functions on a network. Standard networking protocols continue to direct some traffic, while SDN takes on responsibility for other traffic, allowing network administrators to introduce SDN in stages to a legacy environment.
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