Planet IGS-10020MT User Manual page 136

It's import to remove the VLAN members from VLAN 1 configuration. Or the ports would become
overlap setting. ( About the overlapped VLAN configuration, see next VLAN configure sample)
4. Assign PVID for each port:
Port-1,Port-2 and Port-3 : PVID=2
Port-4,Port-5 and Port-6 : PVID=3
Port-7~Port-24 : PVID=1
5. Enable VLAN Tag for specific ports
Link Type: Port-3 (VLAN-2) and Port-6 (VLAN-3)
The Per Port VLAN configuration in Figure 4-6-10 appears.
Figure 4-6-10: Port 1-Port 6 VLAN Configuration
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User's Manual of IGS-10020MT