Comment 6 for bug 1870529

I just checked Train on CentOS7.

(undercloud) [<email address hidden> ~]$ openstack baremetal port show 347beced-67f3-4650-97ab-32202b387336
[...]
| physical_network | None |
[...]

Apparently, physical_network is not set during introspection, even though the docs suggest it:
https://docs.openstack.org/project-deploy-guide/tripleo-docs/latest/environments/baremetal.html#instackenv