ZyXEL Communications ES3500-24 User Manual page 53

Go to Advanced Application > VLAN > Static VLAN, and create a VLAN with ID of 100. Add
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ports 5, 6 and 7 in the VLAN by selecting Fixed in the Control field as shown.
Deselect Tx Tagging because you don't want outgoing traffic to contain this VLAN tag.
Click Add.
Go to Advanced Application > VLAN > VLAN Port Setting, and set the PVID of the ports 5, 6
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and 7 to 100. This tags untagged incoming frames on ports 5, 6 and 7 with the tag 100.
ES3500 Series User's Guide
Chapter 6 Tutorials
53