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Sounds as database error. Table networks or some other tables of Neutron database may be corrupted.
mysql> show networks status;

Sounds as database error. Table networks or some other tables of Neutron database may be corrupted.
mysql> show networks status;

On my system it looks something like:

MariaDB [neutron]> show table status from neutron like'networks';

+----------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+ | Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment | +----------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+ | networks | InnoDB | 10 | Compact | 2 | 8192 | 16384 | 0 | 0 | 0 | NULL | 2014-06-23 11:40:11 | NULL | NULL | utf8_general_ci | NULL | | | +----------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+ 1 row in set (0.00 sec)

Sounds as database error. Table networks or some other tables of Neutron database may be corrupted.
mysql> show networks status;

On my system it looks something like:

MariaDB [neutron]> show table status from neutron like'networks';

+----------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+ | Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment | +----------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+ | networks | InnoDB | 10 | Compact | 2 | 8192 | 16384 | 0 | 0 | 0 | NULL | 2014-06-23 11:40:11 | NULL | NULL | utf8_general_ci | NULL | | | +----------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+ 1 row in set (0.00 sec)

If yoursetup Neutron ML2&&OVS&&VLAN(GRE) and database "neutron" has not been created along with required tables, your setup is incorrect.