ZyXEL Communications GS1920 - How to Configure VLAN Trunking on the Switch

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3.1.7 How to configure VLAN Trunking on the switch?
Overview
VLAN trunking, allow an unknown VLAN groups frame pass through a port.
Communicate with end device without the same VLAN configuration on the
switch.
VLAN trunking topology:
Figure 1
Note: In the scenario the task is to let switch 1 VLAN10/20 communicate with
switch 2 VLAN 10/20, but the highlight part 3 switch in the center are not
configured with the same VLAN. So we need to activate the VLAN trunking in the
3 switch to reach the goal.
1. Select a port connected to the other switch to allow frames belonging to
unknown VLAN groups to pass through the Switch. Then click Apply to activate
the features.
Figure 2 Advanced Application > VLAN > VLAN Configuration > VLAN Port Setup