Under the port mode, the VLAN-VPN supports QinQ and provides two tags to correspond to the public VLAN and the private VLAN respectively.
QinQ is also known as Double-Tagging, VLAN stacking, NestedVLAN, ServiceVLAN and so on. Namely, it supports double-VLAN tag forwarding. IEEE 802.1ad standard defines that S-TAG(Service VLAN Tag), S-TAG and C-TAG(Customer VLAN Tag) have the same format.
Use of QinQ:
Addresses the shortage of public VLAN ID resource
Enables customers to plan their own VLAN IDs, with running into conflicts with public network VLAN IDs.
Provides a simple Layer 2 VPN solution for small-sized MANs or intranets.
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