智能光网络中一种新型的分布式恢复方法

提出了一种基于固定备用路由和目的端触发的智能光网络中的分布式恢复方法,所选择的任一对源端节点和目的的端节点之间的固定备用路由包括该节点对之间的k条最短路径路由和基于部分链路无关的路由.目的端节点一旦探测到业务通道的失效将立即启动恢复进程,根据网络当前的资源使用情况,在这些备用路由中按照一定的次序选择一条恢复路由并为此分配一条可用的波长(对于没有波长变换器的光网络),然后将恢复通道的建立请求消息发送给该恢复通道的相关节点,这些相关节点可以锁定相关的网络资源,以避免来自其他恢复通道的竞争.所提出的算法增加了固定备用路由的数量,从仿真结果可以看出,该方法明显改善了失效连接的阻塞性能.

A Novel Distributed Restoration Method in Intelligent Optical Networks

A novel distributed restoration method based on fixed alternate routes and on triggering by destination nodes is proposed in intelligent optical networks.The selected fixed alternate routes between a source node and a destination node include k shortest paths and part links-disjoint paths between the node pair. Upon detecting a service path failure, the destination of this failed path will trigger restoration procedure, select one restoration route from the fixed alternate routes in given order under current network resources and assign one available wavelength (for optical networks without wavelength converters).Then it sends setup request messages to involved nodes on the restoration path to lock out other requests. With increasing the number of fixed alternate routes in our proposed algorithm, this restoration method can improve blocking performance of failed connections.