Review Article
Distributed Controller Placement in Software-Defined Networks with Consistency and Interoperability Problems
Table 6
Most commonly used CPP mathematical symbols.
| Symbols | Description |
| | Network graph | | The set of multiple controllers | | The data plane switches | | Control path | | Total number of controllers | | Total number of switches | | The shortest path between and | | Number of switches under the controller | | Chances of failure | ρ | Controller’s capacity | Δ | S_C latency threshold | | Binary variable to indicate if a switch is associated with a controller | | Binary variable to indicate if a switch is associated with a controller |
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