To improve network reliability and management level in today's high-speed telecommunication networks,a performance and dependability analysis model used for network management is proposed in this paper,which computes in real-time and forecasts performance-reliability,performance-availability for the overall network performance parameter (e.g.bandwidth,throughput and latency) and the MTTF (mean time to failure).Due to the arising complexity of exact model solution,for highly reliable network's management an approximation of the model and its implementation are also presented.