Comment 4 for bug 1831367

Ordering of the environments in the deploy command are important. I guess things in your network-environment.yaml overriding the parameters in network-environment-overrides.yaml.

You can change the order as below and try.

-e /usr/share/openstack-tripleo-heat-templates/environments/network-environment.yaml -e /usr/share/openstack-tripleo-heat-templates/environments/network-isolation.yaml -e /home/stack/templates/network-environment-overrides.yaml