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VLAN Administration Guide
VLAN stacking, also known as the 802.1ad standard, extends the original VLAN tagging technology by allowing VLAN packets to be tunneled in another VLAN tag. This extension is known as QinQ, VLAN stacking, or double tagging. QinQ resolves the scaling limitations of VLAN tagging by increasing the number of VLAN packets that can be transmitted with the limited number of VLAN tags allowed by the standard.