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