User's Manual

556 CHAPTER 13: VLAN MANAGEMENT
Figure 302 Tri-state Check Boxes
In the example above, only some of the selected ports are transmitting
tagged packets on VLAN engineering ID = 3, whereas all ports are
transmitting tagged packets on VLAN accounts ID = 2.
To modify the VLANs on which the selected ports will transmit tagged
packets, use the check boxes beside each VLAN to select/de-select that
VLAN. You can choose from all the VLANs currently being used on your
network.
By default, 3Com Network Director will assume that the following types
of switch port should always be untagged:
■ Switch ports connected to devices that are not switches e.g.
end-stations. 3Com Network Director assumes if a device is not a
switch it will not be able to process VLAN tagged packets.
■ Switch ports that are currently unconnected. 3Com Network Director
assumes that it if these ports are connected in the future then it is
likely that they will be connected to devices that do not recognize
VLAN tagged packets.
If your port selection includes such ports but you have chosen to make
them tagged members of one or more VLANs, you will be presented with
a warning dialog box when you click the Next button. For example: