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The difference between a port-based VLAN and a tag-based VLAN is that the
tag-based VLAN truly divided the network into several logically connected LANs.
Packets rambling around the switches can be forwarded more intelligently. In the
figure shown below, by identifying the tag, broadcast packets coming from
computer A in VLAN1 at sw1 can be forwarded directly to VLAN1.
However, the switch could not be so smart in the port-based VLAN mechanism.
Broadcast packets will also be forwarded to port 4 of sw2. It means the port-
based VLAN can not operate a logical VLAN group among switches.
The GE-DS-242-PoE supports both Port-based VLAN and Tag-based (802.1Q)
VLAN modes. The default configuration is tag-based (802.1Q) VLAN. In the
802.1Q VLAN, initially, all ports on the switch belong to default VLAN, VID is 1.
You cannot delete the default VLAN group in 802.1Q VLAN mode.
NOTE:
VLAN Mode: Port-based
Packets can go among only members of the same VLAN group. Note all
unselected ports are treated as belonging to another single VLAN. If the port-
based VLAN enabled, the VLAN-tagging is ignored.
show vlan mode
Description:
Display the current VLAN mode.
vlan mode
Description:
Change VLAN mode.
Syntax:
vlan mode (disabled|port-based|dot1q)
Parameters:
(disabled | port-based | dot1q) specifies the VLAN mode.
Change the VLAN mode for every time, user have to restart the switch for
NOTE:
valid value.
GE-DS-242-PoE Managed Ethernet Switch User Manual
Chapter 6: Command Line Interface
147
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