徐子川 (教授)

教授   博士生导师   硕士生导师

性别:男

毕业院校:澳大利亚国立大学

学位:博士

所在单位:软件学院、国际信息与软件学院

学科:软件工程

办公地点:开发区校区综合楼

联系方式:0411-62274514

电子邮箱:z.xu@dlut.edu.cn

Algorithms for Fault-Tolerant Placement of Stateful Virtualized Network Functions

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论文类型:会议论文

第一作者:Yang, Binxu

合写作者:Xu, Zichuan,Chai, Wei Koong,Liang, Weifa,Tuncer, Daphne,Galis, Alex,Pavlou, George

发表时间:2018-01-01

收录刊物:CPCI-S

卷号:2018-May

摘要:Traditional network functions (NFs) such as firewalls are implemented in costly dedicated hardware. By decoupling NFs from physical devices, network function virtualization enables virtual network functions (VNF) to run in virtual machines (VMs). However, VNFs are vulnerable to various faults such as software and hardware failures. To enhance VNF fault tolerance, the deployment of backup VNFs in stand-by VM instances is necessary. In case of stateful VNFs, stand-by instances require constant state updates from active instances during its operation. This will guarantee a correct and seamless handover from failed instances to stand-by instances after failures. Nevertheless, such state updates to stand-by instances could consume significant network bandwidth resources and lead to potential admission failures for VNF requests. In this paper, we study the fault-tolerant VNF placement problem with the optimization objective of admitting as many requests as possible. In particular, the VNF placement of active/stand-by instances, the request routing paths to active instances, and state transfer paths to stand-by instances are jointly considered. We devise an efficient heuristic algorithm to solve this problem, and propose a bicriteria approximation algorithm with performance guarantees for a special case of the problem. Simulations with realistic settings show that our algorithms can significantly improve the request admission rate compared to conventional approaches.

发表时间:2018-01-01

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