If the switch were ASUS GigaX 1024P then it's a bit confusing. Although the spec sheet doesn't say anything about .1Q but it does support .1Q, tag-base and/or port-base vlans.
Eagleeye, you may want to configure your ASUS switch correctly, via CNM. Check your CNM manual, pp35, 4.7.5 VLAN setup.