Joint service function chain deploying and path selection for bandwidth saving and VNF reuse

Service function chain (SFC) is managed as a set of chained virtual network functions (VNFs) in a particular order. The efficiency of a network closely depends on how these VNFs are deployed in the network. In this paper, we study the joint problem of service function chain deploying and path selection for bandwidth saving and VNF reuse. We first describes the problem as a multiobjective and multirestriction problem, and then a heuristic service function chain deployment algorithm based on longest function assignment sequence is proposed. Via simulations, we show that our design can reduce the number of deployed VNFs and link bandwidth requirement jointly and serve more requests than other algorithms.