Five must-know open source SDN controllers

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We've rounded up five open source SDN controllers to get to know.
1. OpenDaylight open-source SDN controller. OpenDaylight announced the release of its open-source SDNcontroller platform, Hydrogen, in February 2014. The base edition of Hydrogen includes a modular, multi-protocol SDN controller that's based on OSGi, as wellas an OpenFlow plug-in, an OpenFlow protocol library, the OpenvSwitch Database Management Protocol and YANG tools. With the introduction of an open source SDN controller, OpenDaylight states that it can providecentralized control for any SDN architecture regardless of vendor. The OpenDaylight controller Wiki page includes directions on howto install the OpenDaylight controller, as well as a programmer guide, FAQs and information regarding the Hydrogen and Heliumrelease.
2. OpenContrail SDN controller. OpenContrail offers an SDN controller as part of its Apache 2.0-licensed project that's used to enable network virtualization. Althoughconsidered open, OpenContrail stemmed from Juniper Networks. The controller works along with virtual routers that live on hypervisor hosts,an analytics engine and published northbound APIs. OpenContrail can also act as a network platform for cloud infrastructure. According to the Project, key aspects of its system are network virtualization, network programmability and automation, and big datafor infrastructure. The OpenContrail source code is hosted across multiple software repositories, with the core functionality of the system found in thecontrail-controllerrepository. Additional source code instructions are available as well.
3. Floodlight open SDN controller. The Floodlight open SDN controller is a Java-based OpenFlow controller that is also enterprise-class and Apache-licensed. It is part of a collectionof open source projects done by Big Switch. The controller supports a range of virtual and physical OpenFlow switches and it can handle mixed OpenFlow and non-OpenFlow networks. The Controller includes support for the OpenStack cloud orchestration platformas well. Floodlight has already been used in a number of applications, including the OpenStack Quantum Plug-in and the FloodlightVirtual Switch. The controller is available for download on the project website.
4. Ryu OpenFlow controller. Ryu is an SDN framework that offers software components used in SDN applications. It allows developers to create new network management and control applications. Ryu supports various protocols for managing networkdevices, including OpenFlow, Netconf andOF-config. Documentationis available to learn more about the Ryu network operating system and it is available for download on the project site.
5. FlowVisor OpenFlow controller. FlowVisor is a special-purpose OpenFlow controller that acts as a go-between for OpenFlow switchesand multiple OpenFlow controllers. The controller enables network virtualization by dividing a physical network into multiple logical networks. The controller ensures that each other controller touches only the switches and resources assigned to it. It alsopartitions bandwidth and flow table resources on each switch and assigns partitions to individual controllers. The FlowVisor controller is available for download with directions on its GitHubsite.