3

Creating a Subagent Using the eSNMP API

This chapter describes how to use the eSNMP API to create a MIB subagent that manages entities or applications. Topics included in this chapter are:

Creating a MIB specification (Section 3.1)

The structure of management information (Section 3.2)

Creating a MIB source file (Section 3.3)

Including the routines and building the subagent (Section 3.4)

Including your subagents in startup and shutdown procedures (Section 3.5)

Note

To use this eSNMP API to create a subagent, you must have a C compiler running in your development environment.

3.1 Creating a MIB Specification

The creation of a management information base (MIB) begins with data gathering. During this phase, the developer identifies the information to manage, based on the entities that the network manager needs to examine and manipulate. Each resource that a MIB manages is represented by an object. After gathering the data, the developer uses Abstract Syntax Notation 1 (ASN.1) to specify the objects in the MIB.

3.2 The Structure of Management Information

The structure of management information (SMI), which is specified in RFCs 1155 and 1902, describes the general framework within which a MIB can be defined and constructed. The SMI framework identifies the data types that can be used in the MIB and how resources within the MIB are represented and named.

SMI avoids complex data types to simplify the task of implementation and to enhance interoperability. To provide a standard representation of management information, the SMI specifies standard techniques for the following:

Defining the structure of a particular MIB

Defining individual objects, including the syntax and value of each object

Encoding object values

Creating a Subagent Using the eSNMP API 3–1

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Compaq AAR04BCTE manual Creating a MIB Specification, Structure of Management Information

AAR04BCTE specifications

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