The issue for both of those failures is timeout: exceeded timeout 5 seconds.
2020-03-19 20:26:57.782 22962 ERROR neutron.plugins.ml2.managers ovsdbapp.exceptions.TimeoutException: Commands [<neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.commands.AddLSwitchPortCommand object at 0x7fba9ca44a58>, <ovsdbapp.schema.ovn_northbound.commands.PgAddPortCommand object at 0x7fba9ca44588>, <ovsdbapp.schema.ovn_northbound.commands.PgAddPortCommand object at 0x7fba9ca44630>] exceeded timeout 5 seconds
ovsdbapp.exceptions.TimeoutException: Commands [<neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.commands.AddLRouterPortCommand object at 0x7fdd739eb4e0>, <neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.commands.SetLRouterPortInLSwitchPortCommand object at 0x7fdd72dc04e0>] exceeded timeout 5 seconds
The issue for both of those failures is timeout: exceeded timeout 5 seconds.
2020-03-19 20:26:57.782 22962 ERROR neutron. plugins. ml2.managers ovsdbapp. exceptions. TimeoutExceptio n: Commands [<neutron. plugins. ml2.drivers. ovn.mech_ driver. ovsdb.commands. AddLSwitchPortC ommand object at 0x7fba9ca44a58>, <ovsdbapp. schema. ovn_northbound. commands. PgAddPortComman d object at 0x7fba9ca44588>, <ovsdbapp. schema. ovn_northbound. commands. PgAddPortComman d object at 0x7fba9ca44630>] exceeded timeout 5 seconds
ovsdbapp. exceptions. TimeoutExceptio n: Commands [<neutron. plugins. ml2.drivers. ovn.mech_ driver. ovsdb.commands. AddLRouterPortC ommand object at 0x7fdd739eb4e0>, <neutron. plugins. ml2.drivers. ovn.mech_ driver. ovsdb.commands. SetLRouterPortI nLSwitchPortCom mand object at 0x7fdd72dc04e0>] exceeded timeout 5 seconds