DPSFC: A Distributed Delay-Aware Approach for Improving Parallelized Service Function Chains Placement
Mingxin Zhang, Yintan Ai, Hua Li · 2024
Network Function Virtualization (NFV) virtualizes traditional hardware-based Network devices and intermediate boxes into Virtual Network Functions(VNF). A series of VNF through which packets pass constitute a Service Function Chain(SFC). VNF can be placed as software on general-purpose commercial servers, greatly increasing the flexibility of network services and reducing costs. Packets need to pass through many VNFs to get from the source to the destination of an SFC. To reduce end-to-end delay caused by virtualization and chain length. SFC parallelization has been a successful solution. However, the existing Parallelized SFC(PSFC) placement method does not conform to the distributed design idea of network services. In this paper, we propose a distributed delay-aware PSFC placement approach called DPSFC that all VNF in PSFC are placed on different physical nodes as much as possible and balancing link propagation delay and VNF processing delay to reduce packet deposition at the merge node of parallel modules(pm). Finally, a link packet marking method is proposed to reduce the extra link bandwidth of distributed VNF placement. The simulation results show that compared with the existing approaches, our approach can improve the request acceptance ratio of PSFC while ensuring end-to-end delay.