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The Device subsystem uses the role information maintained by the MastershipManager in order to determine which nodes are allowed to interact in what way with the devices that it has knowledge about. The MastershipManager also listens for device events as cues to force role reelections and relinquishments. Finally, any role-related control messages to and from the network, such as OpenFlow RoleRequests and RoleReplies, must be sent and received via DeviceProviders; therefore, the DeviceService must manipulate the network on behalf of the MastershipService.
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