libvirt users - Mar 2014 - What is the best virtual network for my case?

I have an openvswitch switch controlled by a controller.

I want to have a group of virtual machines which can be on different nodes
but sharing the same ip address thus having the illusion of being on the
same network.

So, each vm I start gets an ip (I was thinking about something like
192.168.y.x 255.255.0.0 where y would be the node and x the vm, this way
each node can have its own dhcp server) which is virtual and belongs to the
same network of the others.

Throught openvswitch I would take care of the communication between
different machines if they belong to different phisical networks.

So, what is the best network configuration according to you?
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