自动交换光网络的控制平面路由技术

Routing Technique of Control Plane in ASON

自动交换光网络(ASON)控制平面的路由协议是由传统的路由协议结合光网络的特点扩展而来的。传统的路由协议包括了OSPF,IS-IS和P-NNI协议,这里则讨论了光层路由协议的模型,对传统路由协议的扩展,以及路由协议的具体设计三个方面。对传统路由协议的扩展,主要包含了如下几个方面的扩展:光链路相关的定义、带外控制信道的支持、对光网络中保护和恢复功能的支持;对分层次路由的支持;对传送网分配地址的支持。在具体设计中,讨论了协议数据包和链路广播两个方面的内容。

The routing protocol of control plane in ASON is evolved from the combination of tra di tional rout ing protocols with the featu res of op ti cal network..Tradition-al protocols include OSPF,IS-IS and P-NNI.In this pa per,the model of optical layer routing protocol,the ex pansion of tradition al routing protocols and their spe-cific de sign are discussed.T he expansion of tradition al proto cols mainly covers following as pects:defini tions re-lated to optical links;sup port to out-of-band control channel; support to pro tection and restoration functions of the opti cal network;sup po rt to layered routing and sup-port to as signed address of transport network. .In terms of specif ic design,protocol data packet and link broad-cast are exam ined.