Creating a Subagent Using the eSNMP API

3.2 The Structure of Management Information

3.2.1 Assigning Object Identification Codes

Each object in a MIB is associated with an identifier of the ASN.1 type, called an object identifier (OID). OIDs are unique integers that follow a hierarchical naming convention.

Each OID has two parts:

•A preassigned portion that is always represented on the SMI tree as 1.3.6.1 or iso (1), org (3), dod (6), Internet (1).

•A developer-assigned portion for the private development of MIBs.

Note

Your organization may require you to register all newly assigned OIDs.

In addition to an OID, you should also assign a name to each object to help with human interpretation.

3.2.2 MIB Subtrees

Understanding MIB subtrees is crucial to understanding the eSNMP API and how your subagent will work.

Note

This manual assumes that you understand the OID naming structure used in SNMP. If not, refer to RFC 1902: Structure of Management Information for Version 2 of the Simple Network Management Protocol (SNMP Version 2).

The information in SNMP is structured hierarchically like an inverted tree. Each node has a name and a number. Each node can also be identified by an OID, which is a concatenation of the subidentifiers (nonnegative numbers). These numbers are on the path from the root node down to that node in the tree. In this hierarchy, data is associated only with leaf nodes. (A leaf node represents a MIB variable that can have an instance and an associated value.)

An OID must be at least two subidentifiers and at most 128 subidentifiers in length. The subidentifier ranges are:

•Subidentifier 1 values range from 0 to 2, inclusive.

•Subidentifier 2 values range from 0 to 39, inclusive.

•The remaining subidentifier values can be any nonnegative number.

Figure 3–1 illustrates the SMI hierarchical tree arrangement as specified in RFCs 1155 and 1902.

3–2Creating a Subagent Using the eSNMP API

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Compaq AAR04BCTE manual MIB Subtrees
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