Vlan (802.1Q) Field Definitions; Table 30: Diag. - 802.1Q Tag Field - Redline RDL-3000 Series User Manual

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VLAN (802.1Q) Field Definitions

The tag is located at the position used for the EtherType/Size field in untagged frames.

Table 30: Diag. - 802.1Q Tag Field

16 bits 3 bits 1 bit 12 bits
TPID PCP CFI VID
Tag Protocol Identifier (TPID): 16-bit field set to 0x8100 identifies the IEEE 802.1Q-
tagged frame. Located at the EtherType/Size field position (untagged frame).
Priority Code Point (PCP): 3-bit field IEEE 802.1p priority bits from 0 (lowest) to 7
(highest).
Canonical Format Indicator (CFI): 1-bit field. Value 0 indicates MAC address is in the
standard format for Ethernet switches.
VLAN Identifier (VID): 12-bit field specifying the VLAN. The VLAN value may be 1 to
4094. Value 0 indicates the 802.1Q tag is specifying only a priority.
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