TP-Link TL-SF2226P - Manual (Page 31)

TL-SF2226P+/TL-SL2226P+ Remote Smart Switch User Guide
Figure 6-10
Only if the VLAN Mode is 802.1Q VLAN, you can see this interface, or you will see an
error massage. The configuration method is similar to Port Based VLAN.
If the VLAN state is DE, it means the VLAN is invalid. U means untag, T means tag.
TRUNK Management
TRUNK Management interface as follows:
Figure 6-11
Before you enable a TRUNK, you must make the properties of the 4 ports be the same. If
you synchronously configure VLAN, in a VLAN, the four ports must exist or be deleted at
the same time. If the VLAN Mode is 802.1Q VLAN, the ports must have the same tag
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