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 ?
Riverbed's application-centric approach to software-defined networking provides application delivery to the edge of distributed enterprises.
Critical software-defined networking ready features: Adds hooks for supporting software-defined networking; provides support for multi-slotted chassis design and large scale, multi-tenant virtual networking
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AT&T (NYSE: T) and Orange (NYSE: ORAN) have signed an agreement to collaborate on open source and standardization initiatives that will accelerate the standardization of software-defined networking (SDN) and network function virtualization (NFV) technologies, the companies said.
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Software-defined networking and merchant silicon Ethernet switches will enable all new levels of network agility and cost-effective operations for cloud and enterprise scale-out data centers.
Sweet, Director of Products at Tolt Solutions, said,"TELoIPs patented software-defined networking technologies add value for both new and existing Tolt customers who increasingly rely on managed VPN and Internet services for day-to-day business operations.
Summary: Riverbed Technology announced the acquisition of Germany-based Ocedo, a provider of software-defined networking and SD-WAN (software-defined wide-area-network) solutions.
Since 2009, Pica8 is the one-stop source for white box networking with PicOS(TM), a network operating system that enables organizations and original equipment manufacturers to easily integrate Layer-2 / Layer-3 networking and software-defined networking (SDN) using commodity switches.
The authors have organized the main body of their text into nine chapters, covering virtualization, software-defined networking, SDN implementation, service providers and SDN, and a wide variety of related subjects.
Pica8 developed PicOS, a network operating system which allows clients to easily migrate from conventional networking to software-defined networking (SDN) using commodity bare metal switches.
phase of Avaya's Software-Defined Networking roadmap.

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