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On basic properties of fault-tolerant multi-topology routing 总被引:1,自引:0,他引:1
Multi-topology routing has recently gained popularity as a simple yet efficient traffic engineering concept. Its basic purpose is to separate different classes of network traffic, which are then transported over disjoint logical topologies. Multi-topology routing is used as a basis for implementation of an IP fast reroute scheme called Multiple Routing Configurations (MRC).MRC has a range of attractive properties, but they do come at a cost. In order to guarantee recovery from any single link or node failure in the network, MRC has to maintain several logical topologies and thus an increased amount of routing information. The number of the logical topologies in MRC need not be large; even simple heuristic algorithms often yield good results in practice. However, why this is the case is not fully understood yet.In this paper, we introduce a theoretical framework for fault-tolerant multi-topology routing (FT-MTR). MRC is a practical implementation of FT-MTR in connectionless IP networks. We use FT-MTR to study how the internal topological structure of the communication network relates to two important problems. The first problem is minimizing the number of logical topologies and thus the routing state in FT-MTR. We show how to use the sets of nodes that separate the topology graph to devise an advanced heuristic for “intelligent” construction of the logical topologies. Finding the separating sets in a topology graph is computationally demanding; we present an algorithm that performs well in tested real network topologies. We evaluate the separation-set based heuristic for the logical topology construction and show that it outperforms the known MRC heuristics.The second problem is the FT-MTR load distribution after a failure. We use the separating sets to devise a novel algorithm for failure load distribution. This algorithm does not require knowledge of the traffic demand matrix, still, our tests indicate that it performs as good as, or better than, known MRC load-distribution algorithms that do require the demand matrix as input. 相似文献
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VPLS网络作为一种新型二层VPN技术,在大型城域网中的应用前景巨大.随着下一代网络(NGN)、网络电视(IPTV)等高质量业务在城域网中的流行,对网络可靠性的需求越来越高.介绍了VPLS网络的基本模型与技术特点,并提出结合MPLS流量工程的快速重路由(FRR)机制,对VPLS网络中关键链路或节点进行保护的方案,以提高... 相似文献
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介绍了中继同抢现象的两种新的处理方法,一种是增加等本端业务层IAM消息的定时器,如果定时内没有收到业务侧的IAM消息则把发生同抢的中继作入中继使用。另一种是不论是否发生在主控中继上本端都要做同抢处理,处理方法是把对端来的呼叫直接接续,本端进行重复试呼。这种方法实现比较简单,同样可以达到解决中继同抢的目的。 相似文献
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结合国道307清徐段实际情况对其进行了改线设计,分析了国道307清徐段改线路线的走向,并对A,B两种路线方案进行比较,分别阐述其优缺点,最终确定B方案为推荐方案。 相似文献
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支持多故障恢复的MPLS快速重路由 总被引:1,自引:0,他引:1
分析了传统MPLS快速重路由应对多故障环境的不足,提出一种支持MPLS域并发多故障时快速恢复的重路由策略.通过有限洪泛故障信息,使本地修复的节点掌握有限范围内节点、链路的可用性信息,并通过建立主,从备份路径,保证MPLS层有效的恢复及较快的切换速度.理论分析及实验结果表明了该方法的可行性和有效性. 相似文献
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传统的MPLS快速重路由技术在面对网络多故障的情况时有许多不足之处,为了更好的解决问题,提出一种新的MPLS快速重路由多故障恢复算法.算法采用Detour路径保护方式,对有不同备份路径经过的链路上的预留带宽资源进行共享管理,并为工作路径建立主、从备份路径.仿真实验结果显示,该算法能够有效减少备份路径上预留带宽资源消耗,对出现多故障的网络进行快速恢复. 相似文献
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提出了一个基于MPLS的带宽保证的N-to-1保护方法,它采用了基于约束的最短路径的选路思想,提出了动态和静态保护方案.该方案充分利用了MPLS所具有的ER-LSP和CR-LSP的优点,和MPLS特有的保护机制,具有重路由快,分组丢失率低,数据包逆序少的特点.它既能提供普通数据链路的保护,也适合用于VoIP和VOD传输的骨干链路.它能极大地提高传统IP网络的故障恢复能力.本文对算法的实现进行了详细的描述.并对所提出的算法进行了部分仿真. 相似文献
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