Redundancy mechanism of Service Function Chain with Node-Ranking Algorithm

Network Function Virtualization (NFV) decouples network functions from dedicated hardware platforms, and reduces the cost of proprietary physical equipment. In NFV environment, Service Function Chain (SFC) combines multiple network functions to deal with traffic, and makes the deployment of network services more flexible. However, this new form of end-to end service brings reliability challenges. Thus, it is essential to avoid service interruption in the event of failure. By using Node-ranking algorithm with Centrality and Reliability (NRCR), we design a redundancy mechanism that considers the sharing of functions and the reliability of physical devices to protect the service from interruption. The simulation results show that our method can reduce the backup consumption by up to 39% with respect to the present algorithms and get a higher SFC requests acceptance ratio.