QinQ is a networking technology that stands for "Quality in Quality". It is also known as VLAN stacking or VLAN double tagging. QinQ is an extension of the IEEE 802.1Q VLAN tagging standard and allows service providers to transport multiple VLANs over a single physical link between two switches or routers.

In a QinQ scenario, two VLAN tags are added to Ethernet frames, with the outer tag used to identify the service provider's VLAN and the inner tag used to identify the customer's VLAN. This allows service providers to provide multiple customers with VLAN services over a single physical link, while also ensuring that each customer's VLAN remains isolated and secure from other customers' VLANs.

QinQ is commonly used in metropolitan area networks (MANs) and wide area networks (WANs) to provide connectivity between customer sites and service provider networks. It is also used in data center environments to provide isolation and segregation of different virtualized networks.

Overall, QinQ technology is an important tool for service providers and network engineers to ensure efficient and secure network communication between different VLANs over a single physical link.

hpe comware switches documentation: https://techhub.hpe.com/eginfolib/networking/docs/switches/5940/5200-1018b_l2-lan_cg/content/491966409.htm

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