PLANET WGSW-52040 - Manual (Page 285)

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Port Mode.
Default:
Trunk port allows all VLAN traffic by default.
Usage Guide:
The user can use this command to set the VLAN traffic allowed to passthrough the Trunk port; traffic of VLANs not
included are prohibited.
Example:
Set Trunk port to allow traffic of VLAN1, 3, 5-20.
Switch(config)#interface ethernet 1/5
Switch(Config-If-Ethernet1/5)#switchport mode trunk
Switch(Config-If-Ethernet1/5)#switchport trunk allowed vlan 1;3;5-20
Switch(Config-If-Ethernet1/5)#exit
17.1.35 switchport trunk native vlan
Command:
switchport trunk native vlan <vlan-id>
no switchport trunk native vlan
Function:
Set the PVID for Trunk port; the “no switchport trunk native vlan” command restores the default setting.
Parameter:
<vlan-id> is the PVID for Trunk port.
Command mode:
Port Mode.
Default:
The default PVID of Trunk port is 1.
Usage Guide:
PVID concept is defined in 802.1Q. PVID in Trunk port is used to tag untagged frames. When an untagged frame
enters a Trunk port, the port will tag the untagged frame with the native PVID set with this commands for VLAN
forwarding.