Comment 1 for bug 1739735

You can set the physical_network field of the ironic nodes' ports to obtain a deterministic port mapping. See the ironic docs [1] and spec [2].

[1] https://docs.openstack.org/ironic/pike/admin/multitenancy.html#physical-networks
[2]https://specs.openstack.org/openstack/ironic-specs/specs/not-implemented/physical-network-awareness.html