环回和源路由是多协议标签交换-传输应用(multi-protocol label switching transport profile,MPLS-TP)网络环保护的2种基本方式,融合它们有利于减少丢包和降低数据时延。针对目前融合二者的方法在控制分组传输路径和倒换时延方面存在...环回和源路由是多协议标签交换-传输应用(multi-protocol label switching transport profile,MPLS-TP)网络环保护的2种基本方式,融合它们有利于减少丢包和降低数据时延。针对目前融合二者的方法在控制分组传输路径和倒换时延方面存在冗余的问题,提出一种新的环保护方法—高效的环回和源路由网络环保护(efficient wrapping and steering,EWAS),通过精简控制分组传输路径消除路径冗余,降低控制分组传送开销和倒换时延,并使中间节点自动倒换数据传送通路以减少数据分组转发次数。理论分析验证了新方法的有效性,仿真结果显示,与环回、源路由和环回和源路由网络环保护(wrapping and steering,WAS)方法相比,EWAS的控制开销和倒换时延分别降低20.55%和15.18%以上。展开更多
The active-fault-alarm （AFA） technologies and the dynamic protection mechanism of the optical network controlled by the multi-protocol label switching transport profile （MPLS-TP） are both studied in this article. ...The active-fault-alarm （AFA） technologies and the dynamic protection mechanism of the optical network controlled by the multi-protocol label switching transport profile （MPLS-TP） are both studied in this article. On this basis, an active dynamic pre-protection （ADPP） mechanism is proposed. This active dynamic pre-protection mechanism is allowed to establish a so called temporary protection path （TPP） for the work path before a potential fault occurs and to switch to TPP only after the fault occurs. It keeps the TPP flexibly only when it is in low- quality or fault state to realize dynamic protection even better and to achieve better resource utilization. Simulation results show that the proposed new mechanism has better performance in terms of the flexibility and the efficiency from the perspective of time.展开更多
The newly developed multi-protocol label switching transport profile （MPLS-TP） fails to actively alarm the fault in advance when conducting restoration in network, or to avoid the false-alarm when equipped with the ...The newly developed multi-protocol label switching transport profile （MPLS-TP） fails to actively alarm the fault in advance when conducting restoration in network, or to avoid the false-alarm when equipped with the active-fault-alarm （AFA） to support carrier-grade reliability. In order to solve this problem, a new AFA based pre-restoration mechanism （AFABPRM） is proposed for MPLS-TP controlled optical network, along with the three levels quality-of-service （QoS） based shortest path first rerouting algorithm （TQ-SPF） in this article. The AFABPRM takes full advantage of the AFA technologies, and can solve the false-alarm problem. Analytical and experimental results suggest the better performances of the new mechanism when compared restoration mechanism with or without AFA function, and show that the AFABPRM can solve the false-alarm problem efficiently.展开更多
文摘环回和源路由是多协议标签交换-传输应用(multi-protocol label switching transport profile,MPLS-TP)网络环保护的2种基本方式,融合它们有利于减少丢包和降低数据时延。针对目前融合二者的方法在控制分组传输路径和倒换时延方面存在冗余的问题,提出一种新的环保护方法—高效的环回和源路由网络环保护(efficient wrapping and steering,EWAS),通过精简控制分组传输路径消除路径冗余,降低控制分组传送开销和倒换时延,并使中间节点自动倒换数据传送通路以减少数据分组转发次数。理论分析验证了新方法的有效性,仿真结果显示,与环回、源路由和环回和源路由网络环保护(wrapping and steering,WAS)方法相比,EWAS的控制开销和倒换时延分别降低20.55%和15.18%以上。
基金Supported by the National High Technology Research and Development Program of China（No. 2009AA01Z255, 2009AA01A345）, the National Basic Research Program of China（No. 2007CB310705 ） and the National Natural Science Foundation of China（No. 60932004）.
文摘The active-fault-alarm （AFA） technologies and the dynamic protection mechanism of the optical network controlled by the multi-protocol label switching transport profile （MPLS-TP） are both studied in this article. On this basis, an active dynamic pre-protection （ADPP） mechanism is proposed. This active dynamic pre-protection mechanism is allowed to establish a so called temporary protection path （TPP） for the work path before a potential fault occurs and to switch to TPP only after the fault occurs. It keeps the TPP flexibly only when it is in low- quality or fault state to realize dynamic protection even better and to achieve better resource utilization. Simulation results show that the proposed new mechanism has better performance in terms of the flexibility and the efficiency from the perspective of time.
基金supported by the Hi-Tech Research and Development Program of China (2009AA01z255)the National Basic Research Program of China (2007CB310705)+2 种基金the National Natural Science Foundation of China (60772024, 60711140087)SRFDP (200800130001)ISTCP (2006DFA11040) and the PCSIRT of China (IRT0609)
文摘The newly developed multi-protocol label switching transport profile （MPLS-TP） fails to actively alarm the fault in advance when conducting restoration in network, or to avoid the false-alarm when equipped with the active-fault-alarm （AFA） to support carrier-grade reliability. In order to solve this problem, a new AFA based pre-restoration mechanism （AFABPRM） is proposed for MPLS-TP controlled optical network, along with the three levels quality-of-service （QoS） based shortest path first rerouting algorithm （TQ-SPF） in this article. The AFABPRM takes full advantage of the AFA technologies, and can solve the false-alarm problem. Analytical and experimental results suggest the better performances of the new mechanism when compared restoration mechanism with or without AFA function, and show that the AFABPRM can solve the false-alarm problem efficiently.
