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Thank you Bernd Bausch, I followed the steps in the OpenStack documentation and this site: https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/8/html/networking_guide/bridge-mappings

  • modified /opt/stack/neutron/etc/oslo-config-generator/openvswitch_agent.ini:

    [ovs]

    bridge_mappings = physnet:br-ex

  • modified /etc/neutron/plugins/ml2/ml2_conf.ini:

    [ml2_type_vlan]

    network_vlan_ranges = physnet

Then I rebooted the VM, ran source admin_openrc.sh (file downloaded from the Horizon UI where I logged in as admin) and the command for creating the network worked.