QinQ

The QinQ technology allows services from the user side to be carried by the QinQ link on the network side. Multiple VLANs of the user network are encapsulated in QinQ mode into one VLAN in the transport network. In this manner, the VLAN resources in the transport network are saved. The QinQ technology is a VLAN stacking and nesting technology. Using the QinQ technology, data packets carry two layers of VLAN tags for the identification purpose. It removes the limit of the original solution in which only one layer of VLAN tag is used, extending the VLAN IDs.

Other related questions:
Configure QinQ
QinQ
QinQ protocol
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