Overview

1.1 SNMP Architecture

Figure 1–1 SNMP Architecture

 

 

 

 

 

Master Agent

 

Subagent 1

 

 

 

 

 

 

 

 

 

 

SNMP/ASN.1

Library

Subagent 2

eSNMP API

AgentX (TCP/IP V5.1)

Subagent n

TCP/IP Kernel

OpenVMS

VM-0704A-AI

The SNMP environment consists of the following elements:

The master agent, a process that runs on the host and handles SNMP requests from clients over the standard SNMP well-known port 161.

One or more subagents, each of which provides access to the MIB data specified in client requests. In the TCP/IP Services implementation, the master agent contains two resident subagents, one that handles a subset of MIB II variables, and another that handles the Host Resources MIB. These MIBs are described in Chapter 2.

The SNMP ASN.1 library, used by the master agent to interpret ASN.1 messages.

The eSNMP API, the application programming interface that provides routines for programming your own subagents. This API runs on the AgentX routines, which are internal to the SNMP architecture.

The TCP/IP kernel running on the OpenVMS operating system.

The master agent and subagents communicate by means of the AgentX protocol, which is based on RFC 2741.

For information about configuring and managing the SNMP service, refer to the Compaq TCP/IP Services for OpenVMS Management guide.

1.2 Request Handling

The eSNMP software manages network communication by having the master agent listen for requests and then passes the requests to the appropriate subagent.

Figure 1–2 illustrates communication between the master agent and subagents.

1–2Overview

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Compaq AAR04BCTE manual Request Handling, Overview Snmp Architecture

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