A smart switch treats incoming packets in the following way:
- If an untagged packet enters a port, it is automatically tagged with the port’s default VLAN ID. Each port has a default VLAN ID that is you can configure. The default setting is 1.
- If a tagged packet enters a port, the tag for that packet is unaffected by the default VLAN ID. The packet proceeds to the VLAN that is specified by the VLAN ID in the packet.
- If a packet enters through a port that is a member of the VLAN that is specified by the VLAN ID in the packet, the packet can be sent to other ports with the same VLAN ID.
- If a packet enters through a port that is not a member of the VLAN that is specified by the VLAN ID in the packet, the packet is dropped.
- Packets that leave the switch are either tagged (“T”) or untagged (“U”), depending on the VLAN to which the port belongs.
For information about a VLAN, visit “What is a VLAN
Last Updated:07/07/2025
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Article ID: 24721