Research and Design of SD-WAN System Based on Blockchain

doi:10.11871/jfdc.issn.2096-742X.2020.05.005

Abstract

Abstract:

[Background] Software defined wide area network (SD-WAN) can effectively solve the problems of expensive and difficult deployment of traditional enterprise-level WAN. However, the network provider lock-in problem restricts SD-WAN to a certain extent for user development. [Objective] The purpose of the research is to provide a platform-based access scheduling and automated settlement solution for SD-WAN, and to release the lock-in problem faced by users. [Methods] This paper proposes a blockchain-based SD-WAN business system, which uses the alliance chain framework to design authentication, authorization, traffic scheduling, settlement supervision and other processes. Moreover, the throughput of the system can be enhanced through improved consensus algorithms. [Results] On this system, users can customize WAN services that shift between different operators automatically with non-tamperable traffic scheduling and settlement. [Conclusions] This system solves the lock-in problem of SD-WAN effectively, and the blockchain technology shows great application potential in network operation.

Key words: blockchain, SD-WAN, smart contract, automatic settlement

Zhuang Liwan,Jin Tao,Zhang Chen,Huang Tao. Research and Design of SD-WAN System Based on Blockchain[J]. Frontiers of Data and Computing, 2020, 2(5): 41-51.

Figures/Tables 6

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共识机制	核心思想	优点	缺点
PBFT	主节点排序请求,从节点响应请求,多数节点响应结果为最终结果	可解决拜占庭故障问题,共识结果的一致性与正确性程度高,共识达成时间快	去中心化程度不足,多中心化机制,算法复杂度高,当节点数量过多时,运行效率较低
Raft	通过分布式节点选举出的领导人节点得到区块记账权	共识结果的一致性和正确性程度高,可达到秒级验证	去中心化程度不足,多中心化机制,算法复杂度较高
DPoS	通过股东投票方式选出代表得到记账权	大幅度缩短共识达成时间,可达到秒级验证	无法完全去中心化,若节点数量过少,投票选出的代表节点代表性不强

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