Qinq (802.1Q-in-Q) traffic is a technology used in Ethernet networks to efficiently handle multiple layers of VLAN tagging, providing enhanced network segmentation and traffic management. By embedding one VLAN tag within another, Qinq enables service providers and large enterprises to deliver better isolation and more efficient data routing across a network infrastructure.

The core benefit of Qinq traffic lies in its ability to support extended VLAN ranges. Traditional VLAN tagging allows for a maximum of 4096 VLAN IDs, which can be limiting in large-scale networks. Qinq overcomes this restriction by creating a secondary tag, allowing for a virtually unlimited number of VLAN IDs, thus enabling more sophisticated network designs.

Key advantage: Qinq simplifies the configuration and management of large-scale VLANs by supporting hierarchical tagging, ideal for large service provider networks and multi-tenant environments.

  • Extended VLAN Range
  • Enhanced traffic isolation
  • Improved network scalability

The implementation of Qinq in a network typically involves the use of special hardware or software configurations that can read and process the double VLAN tags. Below is a simple table showing the basic structure of Qinq tagging:

Tag Position Tag Type
Outer Tag Service Provider VLAN
Inner Tag Customer VLAN