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This is a well known MTU issue. We backported the needed fixes in our packaging. I will just need to update the version where it's fixed, and close the bug.
Please validate with 7.2.0+ and fresh TripleO heat templates and see if it's better now.
According to our records, this should be resolved by openstack-neutron-7.2.0-5.el7ost. This build is available now.
Verified on OSP8 [root@controller-0 ~]# rpm -qa |grep openstack-neutron-7.2 openstack-neutron-7.2.0-5.el7ost.noarch [root@controller-0 ~]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 7.3 (Maipo)