卫星MPLS网络中一种标签检验方案

A Verification Scheme of Label in Satellite MPLS Network

卫星通信系统不可避免会出现误码,误码会导致MPLS标签发生差错。由于目前MPLS协议没有标签检验,标签差错将造成分组错误地插入其他路径,并最终影响其业务承载性能。研究了分组"误插入"和IP数据包丢失之间的关系,建立了MPLS标签交换系统中分组"误插入"事件产生的数学模型,并提出了一种基于单奇偶校验的标签检验方案。对标签检验加入前后LSP承载TCP/IP业务的性能进行了仿真,结果表明本文提出的检验方案能够显著改善卫星MPLS系统的性能。

The inevitable bit errors in MPLS label that induced by satellite channel will cause the data segment mistakenly insert into an error LSP and finally depress its performance.Since the original MPLS protocol didn＇t specify any label verification scheme,it is necessary to design a suitable mechanism that detects the error label in the satellite MPLS network.This paper discusses the relationship between the segment insertion and the loss of IP packet.A mathematical model is constructed to describe the generating procedure of the mistakenly inserted segment on the LSP.The simple odd-even check code is proposed to be a verification scheme of label.Simulations are executed to compare the TCP/IP bearing performance between scenarios that with and without label verification.The result shows that our scheme could dramatically improve the performance of satellite MPLS network.