Tempest test_update_instance_port_admin_state failure

The following tempest test is failing:
tempest.scenario.test_network_basic_ops.TestNetworkBasicOps.test_update_instanc
e_port_admin_state

The scenario:
Router is connected to external network and private network.
Creating an instance that is connected to a private network and associating the private IP port with floating IP.
Changing the port admin status to "DOWN" and trying to connect to the floating IP.
Expected: Connection to instance floating IP will not work.
Result: Connection to instance floating IP works.