Principles of the Layer 2 interoperation feature

QinQ service deployment requires that users be interconnected at Layer 2. However, users connected to the same access device are isolated from each other at this layer. This restricts that QinQ services can be deployed only between different access devices.
In addition, when users connected to the same access device in the same IP network segment exchange data, the upper-layer device needs to forward data at Layer 3 and must support Address Resolution Protocol (ARP) proxy. This promotes the requirements on the upper-layer device. The Layer 2 interoperation feature can solve this problem.
For more information, visit Huawei technical support website.

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