1769-CRR1

1769-CRR1
1769-CRR1
1769-CRR1

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所谓网络生存性，是指以太网应用于工业现场控制时，必须具备较强的网络可用性，如果任何一个系统组件发生故障，都会导致操作系统、网络、控制器和应用程序以至于整个系统的瘫痪，则说明该系统的网络生存能力非常弱。工业以太网的生存性或高可用性包括可靠性、可恢复性、可管理型等三几个方面的内容。

在工业以太网中，网络的可靠性非常重要，需要采取冗余设计，同时还必须有一个快速的故障探测和自恢复机制以**网络的可用性。首先，故障探测和自恢复机制必须是快速响应的，如果网络的恢复时间过长，就不能保证网络的实时性。其次，必须限制网络故障的传播，将其对其他传输设备和网段的影响较小化，即除故障点外，其它网段仍能正常工作。

在透明的交换式以太网中，故障探测和自恢复工作实际上就是在该层重新建立拓扑结构，以实现交换机在MAC层的路由功能。目前普遍使用是IEEE802.1D标准。在局域网内的交换机执行了生成树算法以后，会组成一个动态的生成树拓扑结构，该拓扑结构使局域网内任意两个工作站之间不存在回路，以防止由此产生的局域网广播风暴，同时，生成树算法还负责监测物理拓扑结构的变化，并能在拓扑结构发生变化之后建立新的生成树。例如当一个交换机出现故障或某一条链路断了后，能提供一定的容错能力而重新配置生成树的拓扑结构。交换机根据生成树动态拓扑结构的状态信息来维护和更新MAC路由表，较终实现MAC层的路由。
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