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VLAN通信原理-12833522-51CTO博客
source link: http://blog.51cto.com/12843522/2072697
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vlan的通信原理PVID（PortDefaultVLANID）：接口的默认vlan①报文在交换机内部处理的时候，数据帧都是携带tag（vlanID）。②当不带tag的数据帧进入交换机接口时，交换机会立即给该帧增加PVID的vlan标签。注意：由于PC不识别vlan的tag标签，因此pc发出的报文默认不带标签，且发向PC的报文也必须去掉tag标签。
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