Managing the SNMP protocol

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Overview
Activation
Implementation
Connecting to the device
Reading information
Identifier, OID and MIB

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SNMP functions

Managing the SNMP protocol

Overview

SNMP (Simple Network Management Protocol) is the standard protocol for managing the network devices. The SNMP functions allow you to create applications used to monitor the network elements: PC, servers, switches, robots, ... These functions can also be used to:

Monitor the network load
Optimize the operating mode of the network
Manage the potential network problems.

Remark: SNMP version V1 is supported.

Activation

In order for the PCs found on a network to provide information, the SNMP agent must be enabled.

In Windows, the following steps must be performed:

Display the control panel.
Select "Add/Remove programs".
Select "Add/Remove Windows components".
Add (if necessary) the "Management and monitoring tool" module.
Start the Windows service manager and select "SNMP service".
In the service properties (right mouse click), in the "Security" tab, add two communities: a "public" community with read-only rights and a "private" community with read/write rights.

Implementation

The SNMP functions are implemented in two steps:

Connecting to the relevant device.
Retrieving the requested information.

Connecting to the device

The connection is established by SNMPStartSession.

SessionID = SNMPStartSession("TestDoc", "public")

This function requires:

The IP address of the device.
The name of the SNMP community with which the dialog will be implemented.

The returned identifier is used to dialog with the device.

Reading information

The information is read in the SNMP tree structure by SNMPGet.

This function requires:

the session identifier,
the SNMP identifier of the value to retrieve ("1.3.6.1.2.1.1.1.0" for the RAM for example).

Identifier, OID and MIB

The identifier of the value to retrieve is named OID. This value can be found:

on Internet for the standard values.
in the documentation of the device. This documentation is called MIB and it groups all the specific values of your device.

Remark: SNMPLoadMIB is used to load in memory the information coming from a MIB in order to use the string identifier of the OID instead of its numeric identifier.

Related Examples:

Unit examples (WINDEV): The SNMP functions

[ + ] Using SNMP functions