通过冗余和容错达到的高可用性是许多工业网络部署的关键部分。一个企业网络断开几分钟会带来很多的不方便,而工业网络的中断则可能有灾难性的后果。增强标准的生成树协议(Spanning TreeProtocol)的功能可为局域网的环型结构增加活力以及提高修复错误的速率,而不会牺牲基于标准的冗余解决方案的利益。在部署冗余的工业以太网的应用系统时,公司主要依靠已经开发的定制系统来适应单个的应用。在过去三年中,从运行设备投入生产而获得的实践经验相对较少。已经使用多年但代价昂贵的串行连接协议和专有解决方案的行业试图使标准的以太网 High availability through redundancy and fault tolerance is a key part of many industrial network deployments. Disconnecting a business network for a few minutes can bring a lot of inconvenience, while disruption of an industrial network can have catastrophic consequences. The ability to enhance the standard Spanning Tree Protocol increases the dynamism of the ring fabric of the LAN and increases the rate at which errors can be repaired without sacrificing the benefits of standards-based redundancy solutions. When deploying redundant Industrial Ethernet applications, companies rely heavily on custom systems that have been developed to accommodate individual applications. In the past three years, there has been relatively little practical experience gained from putting operational equipment into production. Industries that have used multi-year but expensive serial connection protocols and proprietary solutions have attempted to make standard Ethernet