PLANET WGSW-52040 - Manual (Page 283)

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means the port allows the traffic of multi-VLANs to pass with tag or untag mode.
Command mode:
Port Mode.
Default:
The port is in Access mode by default.
Usage Guide:
Ports in trunk mode is called Trunk ports. Trunk ports can allow traffic of multiple VLANs to pass through. VLAN in
different switches can be interconnected with the Trunk ports. Ports under access mode are called Access ports. An
access port can be assigned to one and only one VLAN at a time. Hybrid ports can allow traffic of multiple VLANs to
pass through, receive and send the packets of multiple VLANs, used to connect switch, or user’s computer. When
Hybrid ports and Trunk ports receive the data, the deal way is same, but the deal way is different in sending the data.
Because Hybrid ports can allow the packets of multiple VLANs to send with no tag, however, Trunk ports can only
allow the packets of the default VLAN to send with no tag. The attribute of ports can not directly convert between
Hybrid and Trunk, it must configure to be access at first, then configure to be Hybrid or Trunk. When the Trunk or
Hybrid attribute is cancelled, the port attribute restores the default (access) attribute and belongs to vlan1.
Example:
Set port 5 to trunk mode and port 8 to access mode, port 10 to hybrid mode.
Switch(config)#interface ethernet 1/5
Switch(Config-If-Ethernet1/5)#switchport mode trunk
Switch(Config-If-Ethernet1/5)#exit
Switch(config)#interface ethernet 1/8
Switch(Config-If-Ethernet1/8)#switchport mode access
Switch(Config-If-Ethernet1/8)#exit
Switch(config)#interface ethernet 1/10
Switch(Config-If-Ethernet1/10)#switchport mode hybrid
Switch(Config-If-Ethernet1/10)#exit
17.1.33 switchport mode trunk allow-null
Command:
switchport mode trunk allow-null
Function:
Add a port as trunk mode. When enabling GVRP, the mode that adds the ports with trunk mode to all VLANs is not