ATM网络中关键服务生存性保证机制

A GUARANTEED MECHANISM OF CRITICAL SERVICE SURVIVABILITY IN ATM NETWORK

生存性是ＡＴＭ网络中亟待解决的问题．文中在介绍了当前ＡＴＭ网络中基于ＶＰ层的故障恢复机制后，引入生存重要性因子表征网络中不同服务的生存重要性，定义了加权恢复率；基于关键服务生存性保证的要求，提出了关键ＶＣ预建立保护连接和关键ＶＣ优先的实时恢复两种解决方式，并综合形成了关键服务生存性的保证机制．分析和模拟的结果表明该机制能优先保证关键服务的恢复。

Survivability is an important issue in ATM. Following the description of the current ATM VP restoration mechanism, the survivability importance factor is introduced to describe the difference survivability requirement of various services in ATM network and the weighted restoration ratio is defined. To meet the survivability guaranteed requirement of critical services, a mechanism composed of two strategies, critical VC preassign protection connection and prior realtime restoration, is presented here. The result of analysis and simulation shows that this mechanism guarantees the survivability of the critical service and enhances the survivability of the network.