This output of "ovs-vsctl show," taken from a hypervisor that is part of NVP and has guest domains running that are attached to a logical network, shows the tunnels created automatically by NVP.

nvp-ovs-with-tunnels

7e99f9f1-8ec7-48dd-8463-0e04dd5efc11
    Manager "ssl:192.168.1.5:6632"
        is_connected: true
    Manager "ssl:192.168.1.6:6632"
        is_connected: true
    Manager "ssl:192.168.1.2:6632"
        is_connected: true
    Bridge br-int
        Controller "unix:ovs-l3d.mgmt"
            is_connected: true
        Controller "ssl:192.168.1.2:6633"
            is_connected: true
        Controller "ssl:192.168.1.6:6633"
            is_connected: true
        fail_mode: secure
        Port br-int
            Interface br-int
                type: internal
        Port "vnet0"
            Interface "vnet0"
        Port "stt3232236035"
            Interface "stt3232236035"
                type: stt
                options: {key=flow, remote_ip="192.168.2.3", tos=inherit}
        Port "stt3232236034"
            Interface "stt3232236034"
                type: stt
                options: {key=flow, remote_ip="192.168.2.2", tos=inherit}
        Port "stt3232236037"
            Interface "stt3232236037"
                type: stt
                options: {key=flow, remote_ip="192.168.2.5", tos=inherit}
    ovs_version: "1.10.1.24190"