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Chapter 6: Command Line Interface
GE-DS-242-PoE Managed Ethernet Switch User Manual 139
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.
NOTE: You cannot delete the default VLAN group in 802.1Q VLAN mode.
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.
NOTE: Change the VLAN mode for every time, user have to restart the switch for valid
value.