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In some cases, virtual switches that have been embedded in software or the hardware will replace the physical switches. SDN controllers tell switches where to send packets. This lets teams use policy-based management-a kind of automation-to manage network control directly. SDN then implements controllers, considered the brain of the SDN network, and layers them above the network hardware in the cloud or on-premises. SDN strips away the routing and packet forwarding functions, known as the control plane, from the data plane, or underlying infrastructure. The Open Networking Foundation (ONF) helped to standardize the OpenFlow protocol and other open source SDN technologies.īy combining these components, organizations get a simpler, centralized way to manage networks.
Open-source technologies – Programmable networking protocols, such as OpenFlow, direct traffic among network devices in an SDN network.
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Networking devices – Receive instructions from the controllers regarding how to route the packets.The controllers are the load balancers within SDN. SDN controllers – Handle communication with the apps to determine the destination of data packets.Applications – Tasked with relaying information about the network or requests for specific resource availability or allocation.The components used to build a software-defined network may or may not be located in the same physical area. To better understand how SDN works, it helps to define the basic components that create the network ecosystem. Simply put, companies are using SDN because it’s a way to efficiently control traffic and scale as needed. Organizations can also segment different virtual networks within a single physical network or connect different physical networks to create a single virtual network, offering a high degree of flexibility. SDN centralizes this information so that organizations can view and control the entire network and devices. In a traditional environment, a router or switch-whether in the cloud or physically in the data center-is only aware of the status of network devices next to it. SDN also increases visibility and flexibility. With network virtualization, organizations can open the door to greater efficiency through new tools and technology, such as Software-as-a-Service (SaaS), Infrastructure-as-a-Service ( IaaS) and other cloud computing services, as well as integrate via APIs with their software-defined network. Companies today are looking to SDN to bring the benefits of the cloud to network deployment and management.
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