The DSS does not have VLAN support and will be untagged. All VLAN setup will be at the switch side. If using 2 switches in this setup from the link you have you will want to prevent switching loops, and is recommended to use RSTP (802.1w) or Port Trunking on network switches used to build Active - Active Failover network topology. This is noted on the bottom of page 3 of this link.