Redline RDL-3000 - VLAN (802.1 Q) Fields

RDL-3000 User Manual
70-00158-01-DRAFT Proprietary Redline Communications © 2010 Page 137 of 142 November 25, 2010
8.2.3 VLAN (802.1Q) Fields
The tag is located at the position used for the EtherType/Size field in untagged frames.
Table 44: Spec. - 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
canonical format (e.g., for Ethernet switches).
VLAN Identifier (VID): 12-bit field specifying the VLAN. Value 0 indicates the frame
does not belong to any VLAN and the 802.1Q tag is specifying only a priority. VLAN
value may be 1 to 4094.