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tag control information (TCI)

For VLAN tagging according to IEEE 802.1ad and 802.1ah, a 4-byte tagging field is inserted into the Ethernet frame. It consists of two 2-byte data fields, the Tag Protocol Identifier (TPID) and the Tag Control Information

(TCI).

TPID and TCI data field for VLAN tagging according to 802.1Q and 802.1ah

TPID and TCI data field for VLAN tagging according to 802.1Q and 802.1ah

The TCI data field in turn consists of the 3-bit long data field for the Priority Code Point (PCP), the 1-bit field Canonical Format Indicator (CFI) and the 12-bit long data field VLAN Identifier (VID).

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Englisch: tag control information - TCI
Updated at: 22.07.2011
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Translations: DE