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Smart Switch Series Software Manual
B-2 IEEE 802.1Q Virtual Local Area Network (VLAN)
July 2005
IEEE 802.1Q VLANs
Packets received by the switch will be treated in the following way:
• When an untagged packet enters a port, it will be automatically tagged with the port’s default
VLAN ID tag number. Each port has a default VLAN ID setting that is user configurable (the
default setting is 1). The default VLAN ID setting for each port can be changed in PVID
Setting page.
• When a tagged packet enters a port, the tag for that packet will be unaffected by the default
VLAN ID Setting.
• The packet will now proceed to the VLAN specified by its VLAN ID tag number.
• If the port in which the packet entered does not have membership with the VLAN specified by
the VLAN ID tag, the packet will be dropped.
• If the port has membership to the VLAN specified by the packet’s VLAN ID, the packet will
be able to be sent to other ports with the same VLAN ID membership.
• Packets leaving the switch will be either tagged or untagged depending on the setting for that
port’s VLAN membership properties. A ‘U’ for a given port means that packets leaving the
switch from that port will be Untagged. Inversely, a ‘T’ for a given port means that packets
leaving the switch from that port will be tagged with the respective VLAN ID in which it
participated in.
The example given in this section will step through a more elaborate setup illustrating all possible
scenarios for a comprehensive understanding of tagged VLANs.
Example
This example demonstrates several scenarios of VLAN use and how the switch will handle Tagged
and Untagged traffic.
1. Setup the following VLANs: VLAN 10, 20.
2. Configure the VLAN membership. Be sure to set all of them as follows.
• Setting up first VLAN group, VLAN ID = 10:
• Setting up second VLAN group, VLAN ID = 20:
3. Modify PVID Setting to apply previous two VLAN groups: Modify Default VLAN group
(VLAN ID = 1) to apply two new VLAN groups:
The specific ports above have the following Port VLAN ID settings: