“instanceIndex=（0，）”导致了异常SmiError，因为“ValueRangeConstraint（12147483647）在整数32处的“0”处失败

Question

我是python和SNMP（以及pysnmp）的新手。经过两周的学习，我写了一段python代码，试图发送一个陷阱消息。 NotificationType是由代码创建的：

   notification = NotificationType(ObjectIdentity('MY_MIB_FILE','myAlarmCleared'),
                                    instanceIndex=(0,),  
                                    objects={
                                        ('MY_MIB_FILE', 'myAlarmId'):
                                            Integer32(111),
                                        ('MY_MIB_FILE', 'mySystemDN'):
                                            self.DisplayString(''),  # currently a null string
                                        ('MY_MIB_FILE', 'myAlarmNotificationSource'):
                                            ObjectIdentifier(
                                                (1, 3, 6, 1, 4)), # some dummy value
                                        ('MY_MIB_FILE', 'myNotiSequenceNum'):
                                            Integer32(222),
                                        ('MY_MIB_FILE', 'myAlarmManagedObjectInstance'):
                                            self.DisplayString('SubNetwork=nw1,ManagedElement=my-1'),
                                        ('MY_MIB_FILE', 'myAlarmType'):
                                            self.AlarmType(3),
                                        ('MY_MIB_FILE', 'myAlarmProbableCause'):
                                            self.ProbableCause(307),
                                        ('MY_MIB_FILE', 'myAlarmSpecificProblem'):
                                            self.DisplayString('test alarm'),
                                        ('MY_MIB_FILE', 'myAlarmPerceivedSeverity'):
                                            self.AlarmSeverity(6),
                                        ('MY_MIB_FILE', 'myAlarmTime'):
                                            self.DateAndTime(OctetString(self.get_current_date_and_time())),
                                        ('MY_MIB_FILE', 'myAlarmAdditionalText'):
                                            self.DisplayString('alarm testing'),
                                        ('MY_MIB_FILE', 'myAlarmName'):
                                            self.DisplayString('system_testing_alarm'),
                                        ('MY_MIB_FILE', 'myAlarmServiceUser'):
                                            self.DisplayString('Dapeng Jiao'),
                                        ('MY_MIB_FILE', 'myAlarmServiceProvider'):
                                            self.DisplayString('Unknown Service Provider'),
                                        ('MY_MIB_FILE', 'myAlarmSecurityAlarmDetector'):
                                            self.DisplayString('Unknown Alarm Detector'),
                                        ('MY_MIB_FILE', 'myAlarmADMC'):
                                            Integer(1)
                                    }
                                    )

当我执行此代码时，我得到以下smirerror：

^{pr2}$

pysnmp似乎不喜欢为语法定义为的变量添加后缀.0：

Integer32().subtype(subtypeSpec=ValueRangeConstraint(1, 2147483647))).setMaxAccess("readwrite")

这是pysnmp的错误吗？ 或者我不应该加上后缀.0？（至少在从instanceIndex中删除“0”之后，代码才能执行并成功发送陷阱消息。 但有人告诉我

A scalar variable has single instance and is identified by suffix .0 . The object identifier (OID) with .0 suffix indicates a scalar variable (i.e., single instance) (eg, analogous/category of a “table” with only one column) Each of the varbinds in the notification is scalar for this alarm notification.

看来.0是必须的，对吧？还是我们之间有些误会？在

提前谢谢。在

比尔， -大鹏角

该变量的原始MIB定义是：

myAlarmCleared NOTIFICATION-TYPE
    OBJECTS {
        myAlarmId,
        cesSystemDN,
        myAlarmNotificationSource,
        cesNotiSequenceNum,
        myAlarmManagedObjectInstance,
        myAlarmType,
        myAlarmProbableCause,
        myAlarmSpecificProblem,
        myAlarmPerceivedSeverity,
        myAlarmTime,
        myAlarmAdditionalText,
        myAlarmName,
        myAlarmServiceUser,
        myAlarmServiceProvider,
        myAlarmSecurityAlarmDetector,
        myAlarmADMC
    }
    STATUS  current
    DESCRIPTION
        "This notification is generated when an alarm is cleared."
    ::=  {  myAlarmNotifications  3  }

myAlarmTime OBJECT-TYPE
    SYNTAX  DateAndTime
    MAX-ACCESS  read-only
    STATUS  current
    DESCRIPTION
        "This variable is the time of this Alarm object."
    ::=  {  myAlarmEntry  9  }

myAlarmEntry OBJECT-TYPE
    SYNTAX  myAlarmEntry
    MAX-ACCESS  not-accessible
    STATUS  current
    DESCRIPTION
        "A row containing one alarm."
    INDEX   { myAlarmId }
    ::= { myAlarmTable 1 }

转换后的python格式为：

myAlarmCleared = NotificationType((1, 3, 6, 1, 4, 1, xxxx, x, xx, x, xxx, x, 6, 3)).setObjects(*(
("MY-MIB-FILE", "myAlarmTime"), ("MY-MIB-FILE", "myAlarmName"),
("MY-MIB-FILE", "myAlarmServiceUser"), ("MY-MIB-FILE", "myAlarmSpecificProblem"),
("MY-MIB-FILE", "cesSystemDN"), ("MY-MIB-FILE", "myAlarmProbableCause"),
("MY-MIB-FILE", "myAlarmType"), ("MY-MIB-FILE", "myAlarmAdditionalText"),
("MY-MIB-FILE", "myAlarmNotificationSource"), ("MY-MIB-FILE", "myAlarmId"),
("MY-MIB-FILE", "myAlarmManagedObjectInstance"), ("MY-MIB-FILE", "myAlarmADMC"),
("MY-MIB-FILE", "myAlarmSecurityAlarmDetector"),
("MY-MIB-FILE", "myAlarmPerceivedSeverity"), ("MY-MIB-FILE", "cesNotiSequenceNum"),
("MY-MIB-FILE", "myAlarmServiceProvider"),))

myAlarmEntry = MibTableRow((1, 3, 6, 1, 4, 1, xxxx, x, xx, x, xxx, x, x, x, 1)).setIndexNames((0, "MY-MIB-FILE", "myAlarmId"))
if mibBuilder.loadTexts: myAlarmEntry.setDescription("A row containing one alarm.")

myAlarmTime = MibTableColumn((1, 3, 6, 1, 4, 1, xxxx, x, xx, x, xxx, x, x, 1, 1, 9), DateAndTime()).setMaxAccess("readonly")
if mibBuilder.loadTexts: myAlarmTime.setDescription("This variable is the time of this Alarm object.")

日期和时间是从SNMPv2 TC导入的。在

Answer 1

对此有一个更新： 即使是异常也显示问题是由“myAlarmTime”引起的

pysnmp.smi.error.SmiError: Instance index (0,) to OID convertion failure at object 'myAlarmTime': ConstraintsIntersection(ConstraintsIntersection(ConstraintsIntersection(), ValueRangeConstraint(-2147483648, 2147483647)), ValueRangeConstraint(1, 2147483647)) failed at: "ValueRangeConstraint(1, 2147483647) failed at: "0"" at Integer32

但调试之后，似乎真正的问题是'myAlarmId'语法定义。因为该变量是唯一用整数32定义的变量，其范围为（12147483647）

^{pr2}$

在我将其值范围更改为（02147483647）之后 实例索引=（0） 开始工作。在

但我不应该改变对吗？ 那么这个问题的根本原因是什么呢？ Pysnmp错误？ 还是我们对SNMP和MIB文件的误解？在

顺便说一句：后缀.0可以很好地与基于Java的SNMP连接使用。但由于公司的订单和许可证问题，我们需要重新实现它，而且我们认为python应该足够好来实现这一点。在

附加更多与此警报事件相关的MIB定义

myAlarmTable OBJECT-TYPE
    SYNTAX  SEQUENCE OF myAlarmEntry
    MAX-ACCESS  not-accessible
    STATUS  current
    DESCRIPTION
        "A table of all the active alarms on the system."
    ::= { myAlarmObjects 1 }

myAlarmEntry OBJECT-TYPE
    SYNTAX  myAlarmEntry
    MAX-ACCESS  not-accessible
    STATUS  current
    DESCRIPTION
        "A row containing one alarm."
    INDEX   { myAlarmId }
    ::= { myAlarmTable 1 }

myAlarmEntry ::=
    SEQUENCE {
        myAlarmId                   Integer32,
        mySystemDN                  DisplayString,
        myAlarmNotificationSource           OBJECT IDENTIFIER,
        myAlarmManagedObjectInstance        DisplayString,
        myAlarmType                 AlarmType,
        myAlarmProbableCause            ProbableCause,
        myAlarmSpecificProblem          DisplayString,
        myAlarmPerceivedSeverity            AlarmSeverity,
        myAlarmTime                 DateAndTime,
        myAlarmAdditionalText           DisplayString,
        myAlarmName                 DisplayString,
        myAlarmServiceUser              DisplayString,
        myAlarmServiceProvider          DisplayString,
        myAlarmSecurityAlarmDetector        DisplayString,
        myAlarmADMC         INTEGER
    }


myAlarmId OBJECT-TYPE
    SYNTAX  Integer32 (1..2147483647)
    MAX-ACCESS  read-only
    STATUS  current
    DESCRIPTION
        "This object uniquely identifies an entry in the
        Alarm Table. It increases every time a new alarm
        occurs. Due to cleared alarms the index will not be
        contiguous. When the maximum is reached of
        Integer32, the value of this object rolls over to 1."
    ::=  {  myAlarmEntry  1  }

比尔， -大鹏角