When running sync script in repair mode I always get these messages and the LRP gets updated:
$ neutron-ovn-db-sync-util --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/ml2_conf.ini --ovn-neutron_sync_mode repair
DEBUG networking_ovn.ovn_db_sync [None req-350988fd-1649-4b94-b06c-5b2b2d69d562 None None] OVN-NB Sync Routers and Router ports started @ 2018-09-05 12:41:26.610152 {{(pid=117$
2) sync_routers_and_rports /opt/stack/networking-ovn/networking_ovn/ovn_db_sync.py:472}}
WARNING networking_ovn.ovn_db_sync [None req-350988fd-1649-4b94-b06c-5b2b2d69d562 None None] Router Port port_id=70dcff4e-8d8f-495d-a89f-e56a5436b9f3 needs to be updated for n$
tworks changed
WARNING networking_ovn.ovn_db_sync [None req-350988fd-1649-4b94-b06c-5b2b2d69d562 None None] Updating networks on router port 70dcff4e-8d8f-495d-a89f-e56a5436b9f3 in OVN NB DB
DEBUG ovsdbapp.backend.ovs_idl.transaction [-] Running txn n=1 command(idx=0): UpdateLRouterPortCommand(if_exists=False, columns={'external_ids': {'neutron:subnet_ids': u'5fc5$
08e-4dec-45e3-bca6-74db53a2e85e', 'neutron:revision_number': '3', 'neutron:router_name': u'd40a90a2-d0fb-42f3-9db5-45deb1115e68'}, 'networks': [u'10.0.0.1/26'], 'ipv6_ra_confi$
s': {}}, name=lrp-70dcff4e-8d8f-495d-a89f-e56a5436b9f3) {{(pid=11752) do_commit /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py:84}}
DEBUG ovsdbapp.backend.ovs_idl.transaction [-] Running txn n=1 command(idx=1): SetLRouterPortInLSwitchPortCommand(if_exists=True, lswitch_port=70dcff4e-8d8f-495d-a89f-e56a5436$
9f3, lrouter_port=lrp-70dcff4e-8d8f-495d-a89f-e56a5436b9f3, is_gw_port=False, lsp_address=router) {{(pid=11752) do_commit /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_
idl/transaction.py:84}}
DEBUG ovsdbapp.backend.ovs_idl.transaction [-] Transaction caused no change {{(pid=11752) do_commit /usr/lib/python2.7/site-packages/ovsdbapp/backend/ovs_idl/transaction.py:121
}}
