Comment 4 for bug 1870529

Ok, so no port's where defined in instackenv.json. The interfaces for the baremetal node are discovered during introspection and the baremetal port objects are added in ironic by inspector.

When this happens the 'physical_network' field of the baremetal ports are not populated, resulting in an empty value for the agents 'bridge_mappings'.

You can set the physical_network property of the ports with:

openstack baremetal port set --physical-network $PHYSNET $PORT_UUID

In a tripleo undercloud you want to use PHYSNET=ctlplane in most cases. Only routed topologies such as spine-and-leaf and DCN use other physical_networks.

We probably want to log a better error message with instructions to set the physical_network field.