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The generic format of an Ethernet frame is defined below, the 'options' fields may be present if the Type/Length field indicates a VLAN TPID. The VLAN extended Frame Format is defined here.
| Preamble | Destination MAC | Source MAC | Type/Length | Options | Data | FCS |
| 8 | 6 | 6 | 2 | ? | 46 - 1500 | 4 |
| 64 - 1518 bytes | ||||||
NOTES:
The VLAN Extension is PRESENT if the the value of the first Type/Length field is x'8100 (TPID - Tag Protocol Identifier). The Frame Type/Length value is then replaced with the extended VLAN frame as defined below.
| Type/Length | VLAN Descriptor | Options | Type/Length | Data.... |
| 2 | 2 | ? | 2 | 46 - 1500 |
| TPID (value x'8100) |
TCI | Optional TCI indicates presence |
Frame Type/Length |
The TCI is a 16 bit value defined as follows:
| 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
| user_priority | CFI | 12 bit VID (VLAN ID) | |||||||||||||
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