def _delete_nxos_db(self, unused, vlan_id, device_id, host_id, vni,<EOL>is_provider_vlan):
try:<EOL><INDENT>rows = nxos_db.get_nexusvm_bindings(vlan_id, device_id)<EOL>for row in rows:<EOL><INDENT>nxos_db.remove_nexusport_binding(row.port_id, row.vlan_id,<EOL>row.vni, row.switch_ip, row.instance_id)<EOL><DEDENT><DEDENT>except excep.NexusPortBindingNotFound:<EOL><INDENT>return<EOL><DEDENT>
Delete the nexus database entry.

        Called during delete precommit port event.