* hi, I use packstack --allinone install openstack-train on centos 7. then I congfigure neutron. I have eno1,eno2, enp94s0f0... br-int and br-ex network interface.
**ovs-vsctl add-port br-ex eno2
ip link set br-ex up
systemctl restart network**
and I modify ml2\_conf.ini like follow, I only set flat\_networks=extnet. I don't know if need to make other settings.

```
[ml2]
type_drivers=geneve,flat
tenant_network_types=geneve
mechanism_drivers=ovn
path_mtu=0
extension_drivers=port_security,qos

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

[ml2_type_geneve]
max_header_size=38
vni_ranges=10:100

[ml2_type_flat]
flat_networks=extnet

[ovn]
ovn_nb_connection=tcp:172.0.37.47:6641
ovn_sb_connection=tcp:172.0.37.47:6642
ovn_metadata_enabled=True
```

and ovs-vsctl show

```
[root@localhost conversion(keystone_admin)]# ovs-vsctl list Open_vSwitch
_uuid               : 98f5a3eb-9c67-4f83-bbfc-f47a6a69b147
bridges             : [222136d6-969f-49fb-8b78-0922dcf27e6b, 46b9f219-9da1-4b77-8042-56fa5a021c60]
cur_cfg             : 20
datapath_types      : [netdev, system]
db_version          : "8.0.0"
dpdk_initialized    : false
dpdk_version        : "DPDK 18.11.2"
external_ids        : {hostname=localhost, ovn-bridge=br-int, ovn-bridge-mappings="extnet:br-ex", ovn-encap-ip="172.0.37.47", ovn-encap-type=geneve, ovn-openflow-probe-interval="60", ovn-remote="tcp:172.0.37.47:6642", ovn-remote-probe-interval="60000", rundir="/var/run/openvswitch", system-id="e82dd55f-964f-43ad-aaf0-a9b3250588b5"}
iface_types         : [erspan, geneve, gre, internal, "ip6erspan", "ip6gre", lisp, patch, stt, system, tap, vxlan]
manager_options     : [6ef875c8-e6ba-411f-89e4-1dccbee48f32]
next_cfg            : 20
other_config        : {}
ovs_version         : "2.12.0"
ssl                 : []
statistics          : {}
system_type         : centos
system_version      : "7"
```

but when I build instance.have err log like ,any help would be appreciated.
`2022-05-06 14:59:46.545 5253 ERROR neutron.plugins.ml2.managers [req-9fb9b93a-5754-445b-ae71-52f5e06ffc13 e6782ecae65a42f9a2fe0cff5edd1c5c 2331407bfd0c427a9c10393b17924397 - default default] Failed to bind port d93803f9-98e1-4a1b-af10-4ef08d63f7ac on host localhost.localdomain for vnic_type normal using segments [{'network_id': '314b144d-f91b-49b6-ac4a-b26b8b67b650', 'segmentation_id': 12, 'physical_network': None, 'id': '87f4b137-97aa-405f-b6bd-05b78c3b80f8', 'network_type': u'geneve'}]`