Abstract: To improve the communication efficiency and security between Control Elements (CEs) and Forwarding Elements (FEs) of For CES routers, this study researches on internal flow control mechanism. Firstly, an evaluation model based on communication of Transport Mapping Layer (TML) is proposed, which is used to improve service performance of TML. Secondly, in order to prevent redirect channel interference with control channel, this study proposes a bandwidth allocation algorithm called Dynamic Probabilistic Priority Based on Rate and Buffer (DPPBRB). Lastly, to avoid the potential congestion on control channel between one CE and multiple FEs, this study puts forward an internal flow control mechanism. These internal flow control methods that this study proposed effectively prevents the DoS attack from redirect messages and improves reliability of For CES routers. Simulation and experiment results show the feasibility and effectiveness of these methods.