Configure QinQ

QinQ (802.1Q-in-802.1Q) expands VLAN space by adding an additional 802.1Q tag to 802.1Q tag packets. It allows services in a private network to be transparently transmitted over a public network. A packet transmitted on the backbone network carries two 802.1Q tags: a public VLAN tag and a private VLAN tag.
QinQ implementation falls into two types: basic QinQ and flexible QinQ. Basic QinQ is implemented based on an interface. After this feature is configured on an interface, the interface will attach a default local tag to packets it receives, regardless of whether the packets carry a VLAN tag. For details about the configuration procedure, choose Configuration > CLI-based Configuration > Ethernet Switching Configuration Guide > QinQ Configuration > Configuration Examples > Example for Confituring Basic QinQ through the URL: Product Documentation. Flexible QinQ is implemented based on a combination of interfaces and VLANs. After receiving packets, an interface may forward packets based on one tag or two taggs. For details about the configuration procedure, choose Configuration > CLI-based Configuration > Ethernet Switching Configuration Guide > QinQ Configuration > Configuration Examples > Example for Confituring Selective QinQ through the URL: Product Documentation.

Other related questions:
What are QinQ and selective QinQ
How can I configure selective QinQ on CE switches
QinQ
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