we configure the config file as :

{odl_dir}/etc/opendaylight/datastore/initial/config/genius-itm-config.xml ：

<def-tz-enabled>false</def-tz-enabled>

 <gpe-extension-enabled>true</gpe-extension-enabled>
{odl_dir}

/etc/opendaylight/datastore/initial/config/netvirt-elanmanager-config.xml 

<auto-config-transport-zones>true</auto-config-transport-zones>

 <use-of-tunnels>true</use-of-tunne

My openstack environment is one controller and two compute nodes. The odl is Nitrogen SR2.

After I restart the controller node, the tunnel flow tables of table 0 of computes nodes are lost.