Applying the policy concept to avoid logical race conditions in multilayer network restoration

J. Kroculick, IL Cynthia Hood
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引用次数: 0

Abstract

Protection switching interactions in wide-area networks need to interoperate with each other in order to restore a wide variety of service types, provide survivability to mission-critical applications and accommodate an evolving network infrastructure. Without some coordination between restoration mechanisms, an outage duration would be lengthened as methods assigned to each layer interfere with each other or the network would be locked up in a deadlocked state that never converges to a new topology. A set of control policies can be specified to coordinate between restoration mechanisms in a network that spans multiple layers and regions. These control policies are expressed as rules, and are collectively denoted as the escalation strategy. The escalation strategy can be provisioned by a network manager and is implemented as a distributed coordination protocol between peer recovery agents in the nodes. As rules for coordinating between restoration mechanisms are formalized, a mathematical proof could be provided to prove that the network does indeed converge to a new topology.
应用策略概念避免多层网络恢复中的逻辑竞争条件
广域网中的保护交换交互需要彼此互操作,以便恢复各种各样的服务类型,为关键任务应用程序提供生存能力,并适应不断发展的网络基础设施。如果恢复机制之间没有某种协调,那么由于分配给每一层的方法相互干扰,或者网络将被锁定在永远不会收敛到新拓扑的死锁状态中,因此中断持续时间将会延长。在跨层、跨区域的网络中,可以通过指定一组控制策略来协调不同的恢复机制。这些控制策略表示为规则,并统称为升级策略。升级策略可以由网络管理器提供,并作为节点中的对等恢复代理之间的分布式协调协议实现。随着恢复机制之间协调规则的形式化,可以提供一个数学证明来证明网络确实收敛到一个新的拓扑。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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