A Service Function Chain Deployment Scheme Based on Heterogeneous Backup

Building a service function chain (SFC) based on Virtual Network Functions (VNFs) greatly improves the flexibility of network service deployment. However, compared to highly reliable carrier-grade proprietary hardware, VNF is facing a series of failure risks. Although the existing backup methods can solve the problem of VNF failure to some extent, malicious attacks can't be stopped totally because there is no consideration of the homogeneity of the original node and the backup nod. In this paper, we propose a heterogeneous backup deployment scheme. It ensures the heterogeneity of backup server nodes and VNF nodes with the original one during backup. We designed and implemented the corresponding deployment algorithm. Simulation results show that compared with the backup method without considering heterogeneity, our method increases attacker's attack time cost by 13.2% under the cost that the request acceptance rate decreases by 4.81%.