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依据IEEE 802.17协议,弹性分组环中所有链路故障都被视作双向链路故障,当环路发生单向链路故障时,为了避免不必要的带宽损失,提出一种改进的源路由保护倒换方案。利用TP(Topology)帧帧头extendedControl域中的保留bit辅助传递链路故障信息,使得环路能够区分单、双向链路故障以便采取最优的重路由操作。分析结果表明:在单向链路故障的情况下,该方案使得环路的故障链路消耗带宽下降了约17%。仿真结果也验证了在单向链路故障下,该方案能够显著提高环路的吞吐量,降低业务的平均延迟时间,并缓解环路的拥塞状况。该方案实现简单,具有很好的应用潜力。
According to the IEEE 802.17 protocol, all link failures in a flexible packet ring are considered as bidirectional link failures. To avoid unnecessary loss of bandwidth when a one-way link failure occurs in the loop, an improved source-route protection switching Program. Using the reserved bit in the extendedControl field of the TP (Topology) frame header to assist in transmitting the link fault information, the loop can distinguish single and bidirectional link faults for optimal rerouting operation. The analysis results show that in the case of one-way link failure, this scheme reduces the consumed bandwidth of the failed link of the loop by about 17%. The simulation results also verify that under unidirectional link failure, the solution can significantly improve the loop throughput, reduce the average delay of the service and ease the congestion of the loop. The scheme is simple and has good potential for application.