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电力通信网络各安全分区业务通过分组传送网(PTN)进行承载,其隔离效果亟须得到验证。文中围绕电力PTN业务安全,基于标签交换路径(LSP)和端到端的伪线仿真(PWE3)技术,从安全脆弱性角度分析电力业务间的风险关联特性。针对不同安全分区电网业务,建立了伪线业务间的风险关联模型。仿真结果表明,PTN在承载各类安全分区业务时,若发生网络拥塞,PTN承载的安全Ⅱ区(高等级)业务丢包率变化几乎为零,时延稳定性较高,展现了PTN良好的隔离性;PTN承载的安全Ⅲ区和Ⅳ区(低等级)业务则会受到不同程度的影响(丢包变化百分比分别小于1%和10%),Ⅲ区业务存在一定的时延抖动,而Ⅳ区业务时延稳定性较差。此外,文中研究了电力弹性业务间的影响传播过程。结果表明,随着业务邻居阶数增加,丢包率和时延稳定受影响程度逐渐降低,且各阶邻居受到的影响呈现正负交替特性。总体来看,在合理设置安全分区业务的服务等级和服务质量(QoS)配置的情况下,PTN具有良好的通道隔离效果,可保障电力信息的安全可靠传输。
Each security zone service of the power communication network is carried by a packet transport network (PTN), and its isolation effect needs to be verified. This paper focuses on the power PTN business security, label switched path (LSP) and end-to-end pseudo wire emulation (PWE3) technology to analyze the risk correlation characteristics of power services from the perspective of security vulnerability. For different security zoning power grid business, established a risk correlation model between the business of the Pseudowire. The simulation results show that when PTN carries various types of security services, if the network congestion occurs, the change of packet loss rate of security Ⅱ (high level) service carried by PTN is almost zero, and the delay stability is high, which shows that the PTN is good Isolation; the security of Region III and Region IV (lower level) services carried by PTN will be affected to varying degrees (packet loss percentage changes are less than 1% and 10%, respectively), and there is a certain delay jitter in Region III, District business delay stability is poor. In addition, this paper studies the process of impact transmission between electricity elasticity business. The results show that as the order of service neighbors increases, the degree of impact on packet loss rate and delay stability gradually decreases, and the influence of the neighbors of each rank shows the positive and negative alternation characteristics. Overall, PTN has a good channel isolation effect to ensure the safe and reliable transmission of power information when the service level and quality of service (QoS) configuration of the security partitioning service is reasonably set.