基于T-MPLS网络的多等级分组业务传送特性研究

Study of transport characteristics of multi-level packet service for T-MPLS networks

基于国际电信联盟制定的传送多协议标记交换(T-MPLS)标准,在T-MPLS网络中电路业务和分组业务并存的情况下,对业务开关时间和数据包长服从帕雷托、对数正态、威布尔和指数分布的多等级分组业务传送质量进行了研究。理论分析表明,电路业务在边缘节点适配时被切割成的数据包的长度以及以业务源开关时间及分组数据包长分布为代表的流量特性,会对高等级分组业务的时延及其方差、路由器出端口处的队列长度和丢包率造成不同程度的影响。通过基于OPNET软件搭建的软件平台进行仿真,验证了理论分析的结论。

Based on ITU-T＇ transport muhi-protocol label switching （T-MPLS） standard, this paper studies the multi-level packet service transport characteristics of the T-MPLS networks which deal with the circuit service and the packet service simultaneously and obey the Pareto distribution, the Lognormal distribution, the Weibull distribution and the exponential distribution in service ON/OFF duration and packet length. The theoretical analysis shows that the cutting length of cir- cuit service at edge routers and the distribution characteristics of the ON/OFF duration and packet length have different levels of effect on the high class packet service in latency and its variance, queue length and packet lost rate at the routers＇ egress. The conclusions of theoretical analysis were proved by the simulation using a test bed based on the OPNET modeler.