I am new to Openstack I am trying to setup the VLAN Configuration in neutron by connecting two Ubuntu servers

Server1 Acts as Controller+Network(eth0 is connected to Internet) Server2 Acts as Compute(eth0 is connnected to Internet) I have connected the eth1 of Server1 and Server2 back to back.

Can I do VLAN neutron configuration in this Setup? I was able to do gre configuration in this setup

If not should I connect the eth1 of both the servers to a Switch and Configure Vlans on the port?

If someone has good pointers to proceed with Configuration please share