逻辑接口的一个示例是用于通过IPv 4网络发送IPv 6数据包的隧道接口。
An example of a logical interface is a tunnel interface that is used to send IPv6 packets across an IPv4 network.
现今四接口高速公路的设计所要面对的是900公里新道路，600座桥梁和131个隧道。
The current design of four connector highways envisages 900km of new roads, 600 Bridges and 131 tunnels.
然而，隧道是点到点接口，这些数字是被忽略的。
However, tunnels are point-to-point interfaces and this number is then ignored.
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