[ml2]
type_drivers = flat,vlan
tenant_network_types =
mechanism_drivers = openvswitch

#[ml2_type_flat]
#flat_networks = physnet1

[ml2_type_vlan]
network_vlan_ranges = physnet1

[securitygroup]
firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver
enable_security_group = True
enable_ipset = True

[ovs]
bridge_mappings = physnet1:br-ex
physical_interface_mappings = physnet1:bond0



Commands i am using
neutron net-create provider-108 --shared --provider:network_type vlan --shared --provider:physical_network physnet1 --provider:segmentation_id 108


neutron agent-list
+--------------------------------------+--------------------+-----------------------------+-------+----------------+---------------------------+
| id                                   | agent_type         | host                        | alive | admin_state_up | binary                    |
+--------------------------------------+--------------------+-----------------------------+-------+----------------+---------------------------+
| 4ad9693a-d17b-4f9a-989f-e960faa2dfd8 | Open vSwitch agent |  vmHost1 |             :-)  | True           | neutron-openvswitch-agent |
| 7b519333-4aaf-4dce-a077-cea504475292 | DHCP agent         |  vmHost1 |             :-)  | True           | neutron-dhcp-agent        |
| 85ac3545-147f-42f2-b851-092d3b69279b | DHCP agent         | controller                  | :-)   | True           | neutron-dhcp-agent        |
| 8679b402-6108-4845-a4a3-aacca3c7ed95 | Metadata agent     | controller                  | :-)   | True           | neutron-metadata-agent    |
| 9cad6fa2-e138-4219-a370-3b468495b11f | Metadata agent     |  vmHost1                    | :-)   | True           | neutron-metadata-agent    |
| c23afa20-17e0-46da-8bb3-7086d23bfccd | Open vSwitch agent | controller                  | :-)   | True           | neutron-openvswitch-agent |
+--------------------------------------+--------------------+-----------------------------+-------+----------------+---------------------------+

ovs-vsctl show
ce28d7c3-5a05-4627-a9e6-a6c30ecae7fd
    Bridge br-ex
        Port "bond0"
            Interface "bond0"
        Port br-ex
            Interface br-ex
                type: internal
    Bridge br-int
        fail_mode: secure
        Port patch-tun
            Interface patch-tun
                type: patch
                options: {peer=patch-int}
        Port br-int
            Interface br-int
                type: internal
    Bridge br-tun
        fail_mode: secure
        Port br-tun
            Interface br-tun
                type: internal
        Port patch-int
            Interface patch-int
                type: patch
                options: {peer=patch-tun}
        Port "vxlan-0a01d06f"
            Interface "vxlan-0a01d06f"
                type: vxlan
                options: {df_default="true", in_key=flow, local_ip="10.1.208.102", out_key=flow, remote_ip="10.1.208.111"}
    ovs_version: "2.3.1"