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针对测量船通信网络由2层帧方式交换升级为3层包交换方式后无法使用上星自环检测方式实现自检测的问题,在分析通信网络自检测模式下的链路特性的基础上,提出基于组播报文实现自检测的构想。设计利用组播洪泛特性实现报文环回的网络拓扑结构以及实现检测与对比报文的硬件设备,阐述检测软件发送、接收、处理报文的流程,实现了网络通断、时延及丢包率的自检测,并通过模拟检测实验证明了设计方案是切实可行的。
Aiming at the problem that the communication network of measurement vessel can not be self-detected by self-loop detection method after upgrading from layer 2 frame mode to layer 3 packet exchange mode, based on the analysis of the link characteristics of self-test mode of communication network, Conception of Self - testing Based on Multicast Message. This paper designs the network topology that uses the multicast flood feature to realize the loopback of the message and the hardware device that detects and compares the message. The flow of sending, receiving and processing of the message is described. Packet rate of self-testing, and through simulation tests show that the design is feasible.