The following tempest tests fail:
tempest.scenario.test_network_advanced_server_ops.TestNetworkAdvancedServerOps.test_server_connectivity_resize
tempest.scenario.test_network_advanced_server_ops.TestNetworkAdvancedServerOps.test_server_connectivity_stop_start
tempest.scenario.test_network_advanced_server_ops.TestNetworkAdvancedServerOps.test_server_connectivity_suspend_resume
tempest.scenario.test_network_advanced_server_ops.TestNetworkAdvancedServerOps.test_server_connectivity_rebuild
tempest.scenario.test_network_advanced_server_ops.TestNetworkAdvancedServerOps.test_server_connectivity_reboot

What these tests do is set up a VM, network, router, and a floating IP, reboot, rebuild, stop-start, etc., the VM and then test that the floating IP is still working.

A SouthboundEvent is generated when the VM goes down which triggers the flow in table:30 to be removed. However, the corresponding SouthBoundEvents for when the port comes back up do not trigger the reconfiguration of the flow.

This fix:
https://git.opendaylight.org/gerrit/#/c/34394/
is where the code to clean up the floating_ips when the port goes down was fixed.