Network virtualization has been proposed as a promising way for running multiple customized virtual networks (VNs) on a shared infrastructure.However
how to provide reliable VN against substrate infrastructure failures has become an increasingly important issue.In this paper
we present a novel VN mapping scheme based on cutset and congestion awareness for the VN topology remain maximizing connected in the event of single substrate node failure.Simulation results show that algorithm can gain more optimal substrate long-term average revenue compared to the previous algorithms without reserving protection resource.