基于GMPLS的波长交换光网络的路由方案

波长交换光网络(WSONs)被认为是目前最有前途的下一代核心和城域网络技术,基于通用多协议标签交换(GMPLS)的分布式控制的WSONs,可以在光网络发生故障后尽快地将受故障影响的业务恢复,GMPLS协议提供路由,信令和链路管理职能,因此,基于GMPLS的WSONs端到端光路可以动态建立,维持和释放。为减少功率平坦度对网络的影响,提出了一种适用于大型网络的基于GMPLS的WSONs的感知式路由方案,称为功率平坦度感知的路由方案(POSR),在该方案中,每个网络节点处引入本地矩阵,该矩阵包括路由中所有现有光路的功率平坦度信息,并通过RSVP-TE和OSPF-TE协议存储和动态更新矩阵。利用该矩阵得出功率平坦度最小的路径,使单个波分复用链路在突发故障时功率平坦度对整个网络的影响达到最小。仿真结果表明,该方案可以减少功率平坦度对整个网络的影响。

A routing scheme for GMPLS-based WSONs

WSONs is considered as the next generation＇ s most promising core metropolitan area network technology. WSONs based on GMPLS can recover business as soon as possible which will be affected by the failure after the light network faults, GMPLS protocol provides routing, signaling and link management function, therefore, WSONs end-to-end optical path based on GMPLS can dynamically establish, maintain and release. A new power offset sensing route scheme is presented to decrease the effect of power offset on network. In this new scheme, a local matrix that contains the information on power offset of all lightlinks is used in every net node. RSVP-TE and OSPF-TE are used to update the local matrix dynamically. The route of minimum power offset metric is obtained by local matrix, which minimize the effect of power offset on the whole network result from a WDM link failure. The result of simulation shows that the scheme can decrease the effect of power offset on the whole network.