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C-Tag is an abbreviation of Customer VLAN tag.

The IEEE standard 802.1ad provides for double-tagging by service providers so that they can use VLANs allocated internally together with traffic already tagged as VLANs by service provider customers.

In this double tagging, the C-Tag (customer tag) is the inner tag set by the customer. The S-Tag is the outer tag next to the MAC address.

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nameC-Tag

 


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IEEE standard 802.1ad

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Daniel Bar-Lev

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titleReviewer(s)

Larry Samberg