software-defined networking


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Related to software-defined networking: software-defined storage, network functions virtualization

software-defined networking

An approach to designing, building and operating large-scale networks that is essentially based on programming the forwarding decisions in routers and switches via software from a central server. Software-defined networking (SDN) differs from traditional networking, which requires configuring each device separately and which relies on protocols that cannot be altered.

The primary applications of SDN have been in wide area network (WAN) traffic engineering, datacenter network virtualization and monitoring. SDN gives network administrators the flexibility to customize their networks for their traffic requirements.

Separate the Control from the Forwarding
SDN routers and switches ("bare metal devices") perform basic forwarding functions under program control from a central server that commands the hardware via the OpenFlow interface. Fewer built-in protocols and vendor-specific features in the hardware mean less complexity and greater reliability, and central control makes setting up new networks, as well as making changes, much easier than deploying scripts to each device or waiting for vendors to update their firmware. Software control also enables the creation of innovative forwarding algorithms, and simulating and testing them is simplified, because the hardware can be easily emulated. See SD-WAN.

SDN and OpenFlow
The OpenFlow protocol, which is the basic instruction set in SDN routers and switches, was standardized in 2009, and the first large-scale deployments occurred starting in 2011. See OpenFlow and NFV.


Example From Big Switch Networks
This shows the separation of the software (control plane) from the forwarding (data plane). Providing network virtualization and monitoring, Big Virtual Switch and Big Tap communicate with Big Network Controller (an SDN operating system). Big Network Controller controls the virtual hypervisor switches and physical switches via OpenFlow commands. (Image courtesy of Big Switch Networks, Inc., www.bigswitch.com)
References in periodicals archive ?
Software-defined networking is a seismic technology that allows service providers to develop highly programmable networks with the help of workflow automation.
Dell EMC and VMware also announced SmartFabric Director -- an innovation in software-defined networking that enables the physical switch underlay infrastructure to keep pace with the changing demands of virtualized and software-defined networks.
Dell EMC and VMware also announced SmartFabric Director - an innovation in software-defined networking that enables the physical switch underlay infrastructure to keep pace with the changing demands of virtualized and software-defined networks.
So that, we introduce a new hybrid-SDN architecture that integrates a software-defined networking infrastructure and a real-time distributed network computing framework with advanced optimization to enable self-configuration, self-management and self-adaption for efficiently managing a vast number of IoT heterogeneous devices.
The Congress is going to be the industry leading debating forum and showcase for the rapidly growing and massively influential, Software-Defined Networking and Network Functions Virtualization industries in the context of Indian telecommunications industry.
Software-Defined Networking (SDN) is a bold new approach to network architecture that enables the network to be intelligently and centrally controlled, or 'programmed', using software applications.
The University of New Hampshire Interoperability Laboratory (UNH-IOL), an independent provider of broad-based testing and standards conformance services for the networking industry, announced the launch of the Software-Defined Networking (SDN) Consortium to enable one-stop shopping for controller and switch interoperability, conformance, and benchmark testing.
CenturyLink said that these assets will help accelerate its efforts to automate its network, move network functions into the cloud and deliver software-defined networking and network functions virtualisation services to its customers.
The company provides software-defined networking solutions that are intended to improve network security, session-level performance and reliability.
Riverbed Technology, provider of application performance infrastructure solutions, has announced the acquisition of Germany-based Ocedo, a provider of software-defined networking and SD-WAN (software-defined wide-area-network) solutions.
Since network management in organizations is a complex system, many firms are adopting software-defined networking solutions to instill agility and simplicity and reduce the total cost of ownership.
The single cloud is based on VMware's vCloud for NFV platform, and was rolled out as part of Ooredoo's 'Unify' initiative, which aims to take advantage of a software-defined data centre architecture, as well as NFV and software-defined networking (SDN).

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