Software Defined Networking is a paradigm that promises to transform the traditional network flexible platforms, intelligent to respond quickly to the needs of bandwidth and the dynamic nature of modern applications.
is a concept of flexible and programmable network of which it is believed that the standard communication protocol OpenFlow represents an enabler because it allows the dialogue between the central controller and network devices.
What is Sdn
In an increasingly characterized It called for departments to create private cloud, where virtualization is important, and the need to bring together the wired and wireless infrastructures, made even more urgent by the phenomenon of Bring your own device, networking is an evolution from the set point view of technology and management. A reply contributes Sdn, which makes the network nodes programmable introducing appropriate levels of abstraction, to which access through the use of control interfaces, or Api.
In the construction of the networks It, this approach allows to decouple the control flows from the physical separating the control plane that directs and directs traffic to and from the data center, the data plan that carries traffic by allowing network administrators to respond to change manually controlling the flow of resources. What
essential for the creation of networks defined by the software, the OpenFlow protocol makes Sdn directly programmable architecture and agile, allowing administrators to dynamically adjust the flow of traffic across the network, but also centrally managed, thanks to software- based controller Sdn that maintain a global view of the network.
latter appears as a single logical switch and is configured in a programmed, open and standards-based, vendor-neutral, that simplify the design and operation, making it independent of the specific third-party devices.
Components Sdn
As shown in the diagram below, borrowed from the site of the Open Networking Foundation, infrastructure, control plan and applications represent the core components of a network defined by software.
Source: Open Networking Foundation
Within this scheme, applications communicate explicitly, directly and programmed their specific network controller Sdn through northbound interface, which conceptualizes the details of the lower level, such as data or functions, to deal with layers of higher level using an interface southbound.
In turn, through the control interface, you can monitor forward, reports, statistics and event notifications in order to obtain a direct expression of the behaviors and network requirements at any level of abstraction and between different feature set. Not
no more or only equipment and cables to adapt to new requirements with simple upgrade, but a real “system” that, to be efficient, requires, however, standardization and automation, while the role of software grows exponentially is to enable ‘ integration of individual infrastructure components, both manage it orchestrated in order to provide the right applications at the right time.
Pro Sdn
The explosion device furniture and contents, server virtualization and the advent of cloud services have led to re-examine the networking architectures of traditional network. Within the modern data center traffic patterns have changed dramatically, and users are pushing for access to enterprise content and applications from anywhere, anytime and on any device generating an inevitable demand infrastructure and IT resources to more security, compliance and control.
The tangible business benefits brought by Sdn are:
- faster provisioning of network resources
- increased automation and a concomitant reduction in operating expenses
- more flexibility and customization in the network configuration
- increased use of network capacity in the face of a reduction in capital expenditure
- more security.
Among the advantages to be traced back to Sdn also clear support for cloud providers to better implement and manage service levels guaranteed by applicable uptime guarantees the speed of deployment, the provision of security with the use of the bandwidth.
Clouds empowered to Sdn would also be able to help suppliers in fulfilling the commitments on support for those customers who live cloud service providers as an extension of their IT department.
Against Sdn
Implement network-based software it requires a large initial investment for the replacement of the equipment and an overall review of the network to evolve towards the “software defined” abandoning the static architecture of conventional networks, poorly suited to dynamic computing needs of today’s data center environments, campus networks and carriers.
Sdn: “Who does”
Software-defined networks is much more than a passing fashion technology, the company said market analysts like IDC, predicted that in 2012, by 2016, a market value equal to $ 3.7 billion, and the acquisitions that have occurred on the international scene.
From VMware, which acquired the startup Nicira operating in Sdn, in succession to each other we thought Vyatta with Brocade, Cisco and Juniper Cariden with Contrail, as more and more venture capital investing resources in this area, as well as US startups know Affirmed Networks (103 million dollars raised), Big Switch Networks ($ 45 million) and Plexxi ($ 48 million).
We see an overview of supply and the approach of each player, in alphabetical order
Alcatel-Lucent provides software Sdn through its startup Nuage Networks. The proposed technology allows customers to earn automated provisioning of virtual networks between datacenters. To succeed OpenFlow controllers are used to direct the virtual switches and routers on the networks overlay software with open API. Through Nuage, Alcatel also offers a services gateway top-of-rack server for connecting to its bare-metal virtualization overlay network.
Http://www.nuagenetworks.net/enterprise/virtualized-network- services /
Brocade supports OpenFlow 1.3 through all its switches and routers, including products datacenter fabric owners, switches and routers are enterprise campus. The aim is to enable the Brocade Sdn hybrid and traditional networking to facilitate the transition to network programmabili.
http://www.brocade.com/en/products-services/software-networking/sdn-controllers-applications/sdn-controller.html
Cisco offers Sdn through three main areas consist Wan, datacenter and network access. The company has launched two initiatives Sdn called onePk and Application Centric Infrastructure. Through the latter it offers a new set of Cisco Nexus switches with centralized controllers and the ability to accelerate virtual networks closely related to physical infrastructure below.
OnePk approach allows less of a review and allows a controller that can be OpenDaylight applied to existing Cisco infrastructure in a hybrid model.
http://www.cisco.com/web/IT/solutions/datacenter/aci.html
Dell provides a switch Sdn with support built-in virtualization and automation capabilities along Sdn OpenFlow protocol on existing switches. Dell also offers bare-metal switches can work with Linux Cumulus Network and to open in the future to other systems operativi.
http://www.dell.com/learn/it/it/itbsdt1/solutions/networking-strategy-for-software-defined-networking
Extreme Networks offers the Enterasys OneFabric Connect API. Bees with business applications can be controlled through OneFabric Control Center allowing centralized control of the network to a platform Sdn. The platform also allows you to program the virtualization and application integration with OneFabric Connect and is considered “opne” with its XML / Soap-based API provided by OneFabric Connect.
Http://www.extremenetworks.com / solutions / sdn
At the moment, the one offered by IBM for virtual environments is common, unified architecture Sdn using OpenFlow to put together a structure and network virtualization programmable network . To enable your applications Sdn, Big Blue uses a virtualization platform network controller on a single set with OpenFlow. With this structure, the architecture allows large facilities to be deployed, as well as the devices to be programmed and OpenFlow networks overlapped integrated and perform through hypervisor.
Juniper Networks offers Contrail Sdn open system for virtualization of data center networks. The system includes a controller, an engine and analytic software vRouter endpoint hypervisor.
Http://www.juniper.net/us/en/products-services/sdn/
HP has launched the Virtual Application Networks Sdn controller and a series of OpenFlow switches. The first manages policies and decisions communicated both in the datacenter and campus networks, while the opening level of Bees of Hp on its controller is aimed at enabling a range of partners to develop network applications and services to centralize implementations through its controller.
http://www8.hp.com/it/it/networking/sdn/
Huawei offers a portfolio Sdn based on their SoftCom framework, which caters to the carrier and is based on a combination of network virtualization, control and decoupled Network virtualization function. These products include virtual network provisioning, a flow of carrier-grade engine and protocol forwarding POF that improves the infrastructure of a trip plan Sdn regardless of format pacchetto.
http://www1.huawei.com/en/solutions/softcom/?utm_source=HW-en&utm_medium=ad-box&utm_campaign=ABtest@FollowUs
Microsoft does not offer a standard Sdn or products for network virtualization but makes available virtual networks by combining overlapping Windows Server with Hyper-V and System Center. Its protocol tunneling, Generic Routing Encapsuletion, or NVGRE, is the foundation for building the network virtualization with Microsoft Hyper-V.
https://www.microsoft.com/en-us/server-cloud/solutions/software-defined-networking.aspx
The ProgrammabelFlow Networking Suite of Nec was the first Sdn trading platform available on the market to influence the OpenFlow protocol and an entire portfolio of virtualized networks. ProgrammableFlow allows customers to deploy, control and monitor network multi-tenant infrastructure. NEC has also created the first commercial OpenFlow Controller 1.3 can allow scalability ecosystem Sdn NEC ProgrammableFlow, which includes switches, a controller and a management console.
Http://www.necam.com/ SDN /
VMware offers Vmware Nsx, a platform for virtualization of network switch-based and virtual hypervisor to accelerate the overlay virtual networks that can be automated and provided on request.
https://www.vmware.com/it/software-defined-datacenter/networking-security
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