Review Article
Distributed Controller Placement in Software-Defined Networks with Consistency and Interoperability Problems
Table 2
Comparison of controllers.
| Controller | Organization | Language | Issue | Multi threading | Capacity | Flow request | Interface | Consistency | Reliability | Scalability |
| NOX | Nicira | C++ | High | Low | Low | Yes | Small | 30 k/s | X | POX | Nicira | Python | High | Low | Low | X | Small | X | X | Maestro | Rice uni | X | X | X | X | X | Small | 300–600 k/s | X | Ryu | NTT lab | Python | X | X | X | X | Small | 6 k/s | OpenFlow | Floodlight | Big switch | Java | High | Low | Low | X | Small | 250 k | X | Beacon | Stanford | Java | X | X | X | Yes | Small | 12.8 m/s | OpenFlow |
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