IPv6 data path continue to work even though IPV6 subnet from Router

Steps.

neutron net-create mynet1

neutron subnet-create mynet1 10.1.1.0/24 --name net1-snet1

neutron port-create mynet1 --name myport11 --security-group=raja

neutron port-create mynet1 --name myport12 --security-group=raja

neutron port-create mynet1 --name myport13 --security-group=raja

nova boot --image raja --flavor myhuge --nic port-id=$(neutron port-list | grep 'myport11' | awk '{print $2}') myhost11 --availability-zone nova:cmp001 

nova boot --image raja --flavor myhuge --nic port-id=$(neutron port-list | grep 'myport12' | awk '{print $2}') myhost12 --availability-zone nova:cmp002

nova boot --image raja --flavor myhuge --nic port-id=$(neutron port-list | grep 'myport13' | awk '{print $2}') myhost13 --availability-zone nova:cmp003

neutron subnet-create mynet1 2001:db8:1111::/64 --ip-version 6 --ipv6-ra-mode slaac --ipv6-address-mode slaac --name net1-snet2

openstack router add subnet net1-snet1

openstack router add subnet net1-snet2