If a network interface goes down, traffic needs to be routed over an alternate path.
如果网络接口失效，需要用替代路径进行路由。
SCTP monitors the paths of the association using a built-in heartbeat; upon detecting a path failure, the protocol sends traffic over the alternate path.
SCTP负责使用内嵌的heartbeat机制来监视联合的路径；在检测到一条路径失效时，协议就会通过另外一条路径来发送通信数据。
The RDAC driver installed in domain 0 takes care of using the preferred path in normal circumstances and switching to the alternate path in case of interruption.
安装在Domain0中的RDAC驱动程序负责在正常情况下使用优先路径，在出现中断时切换到备选路径。
If the line of sight is obstructed, sometimes an alternate path can be established using an intermediate site as a repeater.
如果视距被阻挡，则可利用某一中间地点做为中继站，以建立一条迂回路径。
If the line of sight is obstructed, sometimes an alternate path can be established using an intermediate site as a repeater.
如果视距被阻挡，则可利用某一中间地点做为中继站，以建立一条迂回路径。
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