Ping works between VM Instances when network is updated with disable port security.

Steps to reproduce:

openstack  network create network_1 --provider-network-type vxlan

openstack subnet create --network network_1 --subnet-range 40.0.0.0/24 l2_subnet_1

openstack server create --image cirros --flavor m1.nano --nic net-id=network_1 VM1 --security-group default

openstack server create --image cirros --flavor m1.nano --nic net-id=network_1 VM2 --security-group default

openstack network set network_1 --provider-network-type vxlan --disable-port-security

Check ping from VM1 to VM2 (expected to fail but, ping works)