The qinq stacking vid command enables QinQ stacking on an Ethernet sub-interface.
The undo qinq stacking vid command disables QinQ stacking on an Ethernet sub-interface.
By default, QinQ stacking is not enabled on an Ethernet sub-interface.
Usage Scenario
One physical interface cannot provide L2VPN access to multiple users. To address this problem, you can run the qinq stacking vid command to configure a QinQ stacking sub-interface and bind it to a VSI or L2VC to provide L2VPN access to multiple users.
Prerequisites
Before running the qinq stacking vid command in the VE sub-interface view or global VE sub-interface view, the interface on which the sub-interface is to be created has been bound to a VE-Group.