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The paper deals with the need of high availability of services in the GMPLS-based optical network. The influence of control plane reliability on transport plane services is studied. Several models of control plane implementation with different levels of reliability are mentioned. The impact of applying these models on the availability of services over long-term operation is examined using simulation methods. The results show quantitative differences of service availabilities after using different models. The presented results help designers to choose an implementation model and balance the reliability of GMPLS networks with the cost of their implementation.