Khondoker et al., 2014 [51] developed a decision making template to recommend a controller as objectively as possible. They selected RYU [52] in competition with OpenDaylight,Floodlight, Trema, and POX as the best candidate, based on criteria such as modularity,interface support, and maturity. Floodlight and OpenDaylight were placed second and thirdrespectively. RYU is a composable framework based on Python and well documented anddefined. It supports several southbound interfaces as well as the OF-Switch wire protocol.Floodlight, NOX/POX, RYU are centralised control architectures, while OpenDaylight andONOS also offer distributed functionality via clustering.
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