SDN (Software Defined Networking)
Software-defined Networking (SDN) is enabling new opportunities, never before possible, for developing new applications that can shape how the network functions or is secured for end user applications or mission critical business applications. The ability to innovate within networking is now possible.
Current SDN technologies operate at L2-3 layers and are missing the opportunity to truly deliver on the promise of SDN.
The next generation TRscaler Security Gateway platform unifies best-in-class L4-7 network services into an application control layer, and can integrate this application control with both existing transport networks and emerging SDN technologies. This application control layer can make emerging L2-3 SDN architectures completely app-driven by using app-centric definitions and policies to simplify network design while making the whole network more intelligent.
Software-defined networking (SDN) is an approach to networking in which control is decoupled from hardware and given to a software application called a controller.
When a packet arrives at a switching a conventional network, rules built into the switch's proprietary firmware tell the switch where to forward the packet.
The switch sends every packet going to the same destination along the same path -- and treats all the packets the exact same way. In the enterprise, smart switches designed with application-specific integrated circuits (ASICs) are sophisticated enough to recognize different types of packets and treat them differently, but such switches can be quite expensive.
The goal of SDN is to allow network engineers and administrators respond quickly to changing business requirements. In a software-defined network, a network administrator can shape traffic from a centralized control console without having to touch individual switches. The administrator can change any network switch's rules when necessary -- prioritizing, de-prioritizing or even blocking specific types of packets with a very granular level of control. This is especially helpful in a cloud computing multi-tenant architecture because it allows the administrator to manage traffic loads in a flexible and more efficient manner. Essentially, this allows the administrator to use less expensive, commodity switches and have more control over network traffic flow than ever before.
SDN is sometimes referred to as the "Cisco killer" because it allows network engineers to support a switching fabric across multi-vendor hardware and application-specific integrated circuits. Currently, the most popular specification for creating a software-defined network is an open standard called OpenFlow. OpenFlow lets network administrators remotely control routing tables.