Abstract
A service function chain (SFC) is an ordered virtual network function (VNF) chain for processing traffic flows to deliver end-to-end network services in a virtual networking environment. A challenging problem for an SFC in this context is to determine where to deploy VNFs and how to route traffic between VNFs of an SFC on a substrate network. In this paper, we formulate an SFC placement problem as an integer linear programing (ILP) model, and propose an availability-enhanced VNF placing scheme based on the layered graphs approach. To improve the availability of SFC deployment, our scheme distributes VNFs of an SFC to multiple substrate nodes to avoid a single point of failure. We conduct numerical analysis and computer simulation to validate the feasibility of our SFC scheme. The results show that the proposed scheme outperforms well in different network scenarios in terms of end-to-end delay of the SFC and computation time cost.
Highlights
The fifth generation (5G) mobile communication system is designed to have the capacities of providing enhanced mobile broadband, ultra-reliable and low latency (URLLC), and massive machine-type communication [1]
We considered that one node could host at most one virtual network function (VNF) to avoid a single point of failure in the service function chain (SFC)
We assumed that types of VNFs in one SFC request were different from each other
Summary
The fifth generation (5G) mobile communication system is designed to have the capacities of providing enhanced mobile broadband (eMBB), ultra-reliable and low latency (URLLC), and massive machine-type communication (mMTC) [1] These capacities can provide an enabling environment for emerging applications such as self-driving vehicles, high-definition videos, and internet of things [2]. NFV and SDN, virtual network functions (VNFs) can be installed, removed, or migrated dynamically to adapt to the dynamic network resource requirements due to changes in network topology or network traffic load. In this context, the VNFs are commonly placed in a chain of a specific order in the substrate network.
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