Xid cannot be reserved after OVS connection flaps

When defining large number of networks/subnets in bulk, OVS connection flaps frequently and eventually remains disconnected.

Environment: single openstack node and single ODL.
ODL version: carbon -
distribution-karaf-0.6.0-20170516.135813-5306.tar.gz

To reproduce:

1) using script to define large number of networks/subnets:

neutron net-create vx-net$j-$i --provider:network_type vxlan
neutron subnet-create vx-net$j-$i 10.$j.$i.0/24 -name vx-subnet$j$i --dns-nameserver 8.8.8.8

where j is [1..15] and j is [1..100]

2) Around 1000 networks, OVS connection flaps and eventually remains disconneted.