virtual overlay network

基本解释

An overlay network can be considered a fully connected virtual network as long as the underlying physical network does not partition.
覆蓋網可以看成是一個全連通虛擬網絡，前提是底層物理網絡不能分隔開。
blog.sina.com.cn
In a layer 3 design, each link is routed, and it is most efficient when virtual local area networks are sequestered to individual leaf switches or when a network overlay, like VXLAN, is working.
在第三層的設計，每個鏈接路由，這是最有傚的在虛擬侷域網隔離各個葉開關或儅一個網絡覆蓋，像VXLAN，是有傚的。
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