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IEEE 802.1ad

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Open Source Linux
Open Source Linux
Aug 4, 2022 · Fundamentals

Understanding QinQ: Double-Tag VLANs Explained for Network Engineers

This article explains how QinQ (IEEE 802.1ad) extends traditional VLANs with a second tag to overcome VLAN scalability limits, detailing its functions, implementation methods, packet format, and a step‑by‑step working example for service provider networks.

IEEE 802.1adLayer 2 VPNQinQ
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Understanding QinQ: Double-Tag VLANs Explained for Network Engineers