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Thanks for the bug link! That was it :).

Had to change the table to "ml2_vxlan_endpoints" because we use VXLANs tunnels instead of GRE Tunnels.

[10:45:12][root@ostack-02 ~]$ mysql -p
Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 6143
Server version: 5.5.40-MariaDB-wsrep MariaDB Server, wsrep_25.11.r4026

Copyright (c) 2000, 2014, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> use neutron;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
MariaDB [neutron]> select * from ml2_vxlan_endpoints ;
+---------------+----------+
| ip_address    | udp_port |
+---------------+----------+
| 10.13.111.121 |     4789 |
| 10.13.111.122 |     4789 |
| 10.50.0.231   |     4789 |
| 10.50.0.232   |     4789 |
+---------------+----------+
4 rows in set (0.00 sec)

MariaDB [neutron]>
MariaDB [neutron]> delete from ml2_vxlan_endpoints where ip_address = "10.50.0.231";
Query OK, 1 row affected (0.00 sec)

MariaDB [neutron]> 
MariaDB [neutron]> delete from ml2_vxlan_endpoints where ip_address = "10.50.0.232";
Query OK, 1 row affected (0.00 sec)

MariaDB [neutron]> select * from ml2_vxlan_endpoints ;
+---------------+----------+
| ip_address    | udp_port |
+---------------+----------+
| 10.13.111.121 |     4789 |
| 10.13.111.122 |     4789 |
+---------------+----------+
2 rows in set (0.00 sec)

MariaDB [neutron]>

Also performed a " systemctl restart neutron-openvswitch-agent" on the compute nodes and we're done!

Thanks!