| Summary: | Service Function Chain(SFC) deployment is a key technology for realizing flexible and diverse network services,and SFC reliability is an important index in SFC deployment work.Existing methods improve the reliability of SFC while waste network resources.In order to balance SFC reliability and network resource consumption,a VNF diversity backup(VDB) mechanism is designed to improve SFC by utilizing limited network resources,splitting low-reliability VNF instance into two replica instances,and performing cross-backup of VNF replica instances.In the SFC deployment phase,a VDB mechanism-based service function chain deployment method is proposed,a multi-stage graph is constructed based on the improvement results of the VDB mechanism and network topology attributes,and a dynamic planning algorithm based on Viterbi is used to search for the optimal deployment paths in the multi-stage graph.In addition,an evaluation metric,the backup price/performance ratio,is introduced to measure the balancing effect of the reliability of the SFC and the consumption of the network resources.Simulation results show that the proposed method effectively balances reliability and network resource consumption,and the transmission delay has been optimized.
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