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首页> 外文期刊>Journal of network and computer applications >Multicast protection scheme in survivable WDM optical networks
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Multicast protection scheme in survivable WDM optical networks

机译：可生存的WDM光网络中的组播保护方案

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摘要

The protection design is a key issue in survivable wavelength division multiplexing (WDM) optical networks. Most researches focused on protecting unicast traffic against the failure of a single network component such as a link or a node. In this paper, we investigate the protection scheme for multicast traffic in meshed WDM optical networks under dual-link failure consideration, and propose a novel protection algorithm called shared segment protection with reprovisioning (SSPR). Through dynamically adjusting link-cost according to the current network state, SSPR establishes a primary light-tree and corresponding link-disjoint backup segments for each multicast connection request. A backup segment can efficiently share wavelength capacity of its working tree or the common resource of other backup segments. Capacity reprovisioning establishes new segments for the vulnerable connections after a link failure and tolerates following link failures. The simulation results show that SSPR not only can make good use of wavelength resources and protect multicast sessions against any single-link failure, but also can greatly improve the traffic restorability in the event of dual-link breakdown.
机译：保护设计是可生存的波分复用（WDM）光网络中的关键问题。大多数研究集中在保护单播流量免受单个网络组件（例如链路或节点）故障的影响。在本文中，我们研究了在双链路故障考虑下的网状WDM光网络中组播流量的保护方案，并提出了一种新的保护算法，称为带重配的共享段保护（SSPR）。通过根据当前网络状态动态调整链路成本，SSPR为每个多播连接请求建立了一个主光树和相应的链路断开备份段。备份段可以有效地共享其工作树的波长容量或其他备份段的公共资源。容量重新配置会在链路故障后为易受攻击的连接建立新的网段，并容忍后续的链路故障。仿真结果表明，SSPR不仅可以充分利用波长资源，保护组播会话免受单链路故障的影响，还可以在双链路故障时极大地提高流量的可恢复性。

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