TP-Link TD-W9970 User Manual page 42

Enable the Virtual LAN Ports feature:

more LANs that are configured so that they can communicate as if they were attached to the
same LAN. Because VLANs are based on logical instead of physical connections, it is very
flexible for user/host management, bandwidth allocation and resource optimization. If you
want to active Interface Grouping function, please check the box to enable the Virtual LAN
Ports feature.

Note:
It is not allowed to disable the VLAN with Ethernet Connection enabled.
To support this feature, you need to click
WAN interfaces. Click
Default group. Only the default group has IP interface.
Click Add to add a new interface group in the next screen. For example, you want LAN1 and LAN3
to be a group called Group 1 over br_ptm_1_0 WAN interface, you can refer to the following figure.
Click Save to make the entry effective immediately.
Virtual LAN (VLAN) is a group of devices on one or
Add
Remove to remove the grouping and add the ungrouped interfaces to the
to create mapping groups with appropriate LAN and
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TD-W9970 User Guide