Короче, создаю мост:
ovs-vsctl add-br lan0
ovs-vsctl add-port lan0 router0
ovs-vsctl add-port lan0 winxp0
nevlezay-MS-7715 ~ # ovs-vsctl show
8ed76e33-459f-4148-92fa-61ef34ebe826
Bridge "lan0"
Port "router0"
Interface "router0"
Port "winxp0"
Interface "winxp0"
Port "lan0"
Interface "lan0"
type: internal
ovs_version: "2.0.2"