D-Link DES-3326 User Manual - 802.1Q Vlan Tags
Manual is about: 24-Port Fast Ethernet Plus 2-Port Gigabit Module Layer 3 Switch
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DES-3326 Layer 3 Fast Ethernet Switch User’s Guide
Switch Management and Operating Concepts
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Figure 5-7. IEEE 802.1Q Packet Forwarding
802.1Q VLAN Tags
The figure below shows the 802.1Q VLAN tag. There are four
additional octets inserted after the source MAC address. Their
presence is indicated by a value of 0x8100 in the EtherType field.
When a packet’s EtherType field is equal to 0x8100, the packet