Each WAN connection type uses a Layer 2 protocol to encapsulate traffic while it is crossing the WAN link. 当它跨越广域网路链接的时候，每个广域网路连接使用第二层协定来封装流量。
If the lines of a Multilink connection fall below the following percentage of capacity for the following period of time, reduce the connection by one line. 减少多链路连接的一条线路，如果线路占用小于其容量的下列百分比。
