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.
覆盖网可以看成是一个全连通虚拟网络，前提是底层物理网络不能分隔开。
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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.
在第三层的设计，每个链接路由，这是最有效的在虚拟局域网隔离各个叶开关或当一个网络覆盖，像VXLAN，是有效的。
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