Thank you for your reply, exonetinf1nity. Private vlan won't be the solution because it's for access links where one interface can only belong to one vlan.
In my case interfaces are trunk ports. They are connected to IP phones. They have one vlan for voice and another native vlan for data. Now I want only voice VLAN be able to talk among interfaces while the data VLAN can only talk to the uplink port to the gateway router. Is that possible? Thanks!
to be noted that you don't need to configure the ports to be trunk to support a voice vlan and a data vlan
switchport mode access
switchport access vlan 111
switchport voice vlan 20
so you should be able to use private vlans on the data access vlans you should be able to use secondary isolated vlans (isolated secondary do exactly what you need thay just talk to the default GW/primary vlan)
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