unable to attach an interface to an external network

[amon]

when I try to attach an interface to an external network, I get this error
Error: Unable to attach interface. Details
Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible. <class 'nova.exception_Remote.PortBindingFailed_Remote'> (HTTP 500) (Request-ID: req-edeb840b-3d20-42e0-9408-c1937e48046b)

and the neutron server log shows this message:

gmentation_id': None, 'network_id': '3d2efd60-dc06-4f3e-8378-52c7477c8bb5'}]
2022-04-13 15:01:28.108 23 ERROR neutron.plugins.ml2.managers [req-85283402-03ab-4221-9b36-61f89557bdaf 397fa0267ae340e1b24a3a96ae302f32 05b9f31fca434f7a96b63a1d17e8b14c - default default] Failed to bind port 5f673811-2a7e-4ee7-8cc4-f42b14801fde on host compute2.localdomain for vnic_type normal using segments [{'id': 'd66e1712-08fc-4e58-9330-1985fdeb1dc3', 'network_type': 'flat', 'physical_network': 'physnet_test', 'segmentation_id': None, 'network_id': '3d2efd60-dc06-4f3e-8378-52c7477c8bb5'}]

[LIU Yulong (dragon889)]

For openvswitch agent, please check your ``bridge_mappings`` in agent config file, which should include your physical_network type: physnet_test.

[amon (amonster369)]

this is the content of my openvswitch_agent config file :
##############################################################################
tunnel_types = vxlan
l2_population = true
arp_responder = true

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

[ovs]
bridge_mappings = physnet1:br-ex,physnet2:br-ex2, physnet_test:br-test
datapath_type = system
ovsdb_connection = tcp:127.0.0.1:6640
ovsdb_timeout = 10
local_ip = 10.10.10.10

#########################################################

and this is the content of ml2 config file:

#########################################################

[ml2]
type_drivers = vxlan,flat,vlan
tenant_network_types = vxlan
mechanism_drivers = openvswitch,l2population
extension_drivers = port_security

[ml2_type_vlan]
network_vlan_ranges =

[ml2_type_flat]
flat_networks =physnet1,physnet2,physnet_test

[ml2_type_vxlan]
vni_ranges = 1:1000

###########################################

[Jakub Libosvar (libosvar)]

Can you please also check OVS agent logs on compute2.localdomain? Also make sure that br-test bridge is configured there.

[Launchpad Janitor (janitor)]

[Expired for neutron because there has been no activity for 60 days.]