Using OVS to demultiplex traffic to VMs based on VLAN tags (and not rip them off)

Hi,

Is there a way to, using OVS(OpenV Switch) on Ubuntu, demultiplex vlaed traffic to multiple virtual guess based on vlans WITHOUT remove the vlan tags?

Mind someone point me in the right direction (e.g., a web link, example)?
My googling skills are failing me.

Most links (like http://openvswitch.org/support/config-cookbooks/vlan-configuration-cookbook/) give instructions where the OVS bridge will rip off the vlan tags. But I'm trying to preserve them.

Thanks for any pointers.