def passive_interface=(enable)
      fail TypeError unless enable == true || enable == false
      config_set('interface_ospf', 'passive_interface', @interface.name,
                 enable ? '' : 'no')
    end
def passive_interface=(enable)
      fail TypeError unless enable == true || enable == false
      config_set('interface_ospf', 'passive_interface', @interface.name,
                 enable ? '' : 'no')
    end
interface %s
   %s ip ospf passive-interface