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6.7 QinQ

The characteristics of QinQ port device is provided with a simple and flexible two layer VPN

technology, it through the operator's network edge device for users on the private network packet

encapsulation layer VLAN Tag backbone network, messages that carry two layer VLAN Tag

traversal operators (public)。In the public network, only according to the outer VLAN Tag

equipment to transmit the message, and the message of the source MAC address table to study the

outer Tag where the VLAN MAC address table, and private network VLAN Tag users in the

transmission process will be as part of the data packets to be transmitted。

The QinQ feature enables an operator to use a VLAN to serve a network of users with

multiple VLAN。As shown below, the user network A private network VLAN is VLAN 1~10, the

user network B private network VLAN is VLAN 1~20。The A allocated by the operator to the user

network VLAN is VLAN 3, and the VLAN allocated for the user network B is VLAN 4。When

the user A network with VLAN Tag packets in the network operators, the message will be outside

the package on a layer of VLAN ID 3 VLAN Tag; when the user B network with VLAN Tag

packets in the network operators, the message will be outside the package on a layer of VLAN ID

4 VLAN Tag。In this way, packets of different user networks are completely separated from each

other in public network transmission. Even if the VLAN range of two user networks overlaps,

there is no confusion in the public network transmission。