D-Link xStack DES-3800 Series User Manual page 91

xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch
The EtherType and VLAN ID are inserted after the MAC source address, but before the original EtherType/Length or Logical
Link Control. Because the packet is now a bit longer than it was originally, the Cyclic Redundancy Check (CRC) must be
recalculated.
Figure 7- 3. Adding an IEEE 802.1Q Tag
75