读取IPAddress类型的SNMP对象索引 [英] Reading SNMP Object index of type IPAddress

问题描述

在像mib-2.interfaces.ifTable这样的简单SNMP表中，ifIndex是该表的索引，因此您读取ifIndex .1(即从ifIndex的直接子节点读取值)以获取该表的索引.表格的第一行.很简单.

In a simple SNMP table like mib-2.interfaces.ifTable, ifIndex is the index for the table, so you read ifIndex.1 (i.e. read value from direct child nodes of ifIndex) to get the index for the first row of the table. Simple enough.

但是对于mib-2.ip.ipRouteTable之类的东西却不那么明显.在这种情况下，ipRouteIfIndex是索引列.就像ifIndex一样，它被定义为INTEGER.但是，您不能读取直接子节点(即ifIndex .0是直接子节点)，而需要读取ifIndex.0.0.0.0才能获得该值.因此，当它不是索引列的直接子代时，如何知道如何找到该值?

But it's not as obvious with something like mib-2.ip.ipRouteTable. In that case ipRouteIfIndex is the index column. It's defined as INTEGER just like ifIndex was. However, you can't read the direct child nodes (i.e. ifIndex.0 is a direct child), but instead need to read ifIndex.0.0.0.0 to get to the value. So how does one know how to find the value when it's not a direct child of the index column?

有些我不理解的概念. (可能与SNMP对象以.分隔的事实有关，但IP地址也是如此，我不知道如何识别差异).

There is some concept that I'm not understanding. (Probably having to do with the fact that SNMP objects are delimited by . but so are IP addresses, and I can't tell how to recognize the difference).

推荐答案

在这种情况下，您有一个包含多个索引的表.

Note that you have a table with multiple indices in this particular case.

事实是您不能使用snmp-get服务直接读取表条目，因为索引是动态的(因此是OID地址).但是您可以使用snmp-get-next(v1)和snmp-get-bulk(v2)服务发现这些值.

The fact is that you cannot directly read the table entries with snmp-get service, since the index is dynamic (and, as a consequence, the OID address). But you can discover the values with snmp-get-next (v1) and snmp-get-bulk (v2) services.

例如，您可以读取索引(并存储它们以供以后查询表项)或直接读取表中的项:

For example, you can read the indices (and store them for querying table items later) or directly read the items of the table :

• 您向snmp-get-next询问 IP-MIB :: ipAdEntNetMask
• 回复将为 IP-MIB :: ipAdEntNetMask.172.16.38.42 IPV4 255.255.0.0
• (因此:在这种情况下，第一个索引是172.16.38.42！)
• 您迭代并在 IP-MIB :: ipAdEntNetMask.172.16.38.42
之后询问下一个值
• 回复将为 IP-MIB :: ipAdEntNetMask.172.16.11.43 IPV4 255.255.0.0
• 等.直到没有其他值，或者该值不在同一棵树上

• you ask snmp-get-next for IP-MIB::ipAdEntNetMask
• the reply will be IP-MIB::ipAdEntNetMask.172.16.38.42 IPV4 255.255.0.0
• (So: first index is 172.16.38.42 in that case!)
• you iterate and ask next value after IP-MIB::ipAdEntNetMask.172.16.38.42
• the reply will be IP-MIB::ipAdEntNetMask.172.16.11.43 IPV4 255.255.0.0
• etc.. until there is no other value, or the value is not on the same tree

服务snmp-get-bulk将使您可以通过这种方式直接查询N个值.

The service snmp-get-bulk will enable you to query N values directly in this way.

看看在表方面做得很好的 Net-Snmp's snmptable:

Have a look at Net-Snmp's snmptable that does good job with tables : http://net-snmp.sourceforge.net/wiki/index.php/TUT:snmptable

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