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5-4 C
HAPTER
5: A
DVANCED
M
ANAGEMENT
Using AutoSelect VLAN Mode
By default, all ports on the Switch use Port VLAN
Mode — where each switch port is
manually
placed in the required VLAN. The Switch allows
some ports to use another mode, AutoSelect VLAN
Mode. In this mode, the ports are
automatically
placed in the required VLAN by referring to a VLAN
Server database in 3Com’s Transcend Enterprise
Manager v6.0 for Windows.
AutoSelect VLAN Mode works as follows:
1
When an endstation is connected to a Switch or
moves from one port to another, the Switch learns
the MAC address of the endstation.
Figure 5-2
Switch learns the endstation’s MAC address
2
If the relevant port uses AutoSelect VLAN Mode, the
Switch refers to the VLAN Server to determine the
VLAN membership of the endstation.
Figure 5-3
Switch refers to the VLAN Server
3
Having obtained the VLAN membership for the end-
station, the Switch places the relevant port in the
specified VLAN.
Figure 5-4
Switch places the port in the VLAN
AutoSelect VLAN Mode has an advantage over Port
VLAN Mode because once the VLAN Server data-
base is set up correctly, you can move endstations to
other ports or other Switch units and the VLAN allo-
cation of each endstation is automatically config-
ured.