HI,
I use proxmox 4.4
if I create a ovs bridge the gui creates the interfaces part automatically and I can see the is just
+auto vmbr251
+iface vmbr251 inet manual
+ ovs_type OVSBridge
+ ovs_ports eth1
but your documentation says
https://pve.proxmox.com/wiki/Open_vSwitch#Bridges
...