What Is 802.1Q-in-802.1Q (QinQ)?

What Is 802.1Q-in-802.1Q (QinQ)?

Shah Alam Shah Alam

Shah Alam

CCNA | MTCNA | MTCRE | LINUX (CENTOS) | MICROSOFT OFFICE

发布日期: 2024年3月4日
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802.1Q-in-802.1Q (QinQ), defined by IEEE 802.1ad, expands VLAN space by adding an additional 802.1Q tag to 802.1Q-tagged packets. It is also called VLAN stacking or double VLAN. QinQ is widely used on carriers' backbone networks. By encapsulating the VLAN tag of a private network in the VLAN tag of a public network, QinQ enables packets with double VLAN tags to traverse the backbone network (public network) of a carrier, so as to expand VLAN space and implement refined user management.

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