NETGEAR M4200 Software Administration Manual page 66

b. Select the check box that corresponds to interface 1/0/3.
The Interface field in the table heading displays 1/0/3.
c. In the Switchport Mode field, select Trunk.
d. In the Native VLAN ID field, select 2000.
Note: In this step, you configure incoming untagged packets to be tagged
with VLAN ID 2000. If you want the switch to drop untagged packets,
ignore this step.
e. In the Trunk Allowed VLANs field, enter 1000,2000.
f. Click Apply.
Managed Switches
VLANs
66