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Chapter 34 Access Control

IES-612-51 User’s Guide

226

Figure 116 SNMP Management Model

An SNMP managed network consists of two main components: agents and a manager.

An agent is a management software module that resides in a managed device (the IES-612-

51). An agent translates the local management information from the managed device into a

form compatible with SNMP. The manager is the console through which network

administrators perform network management functions. It executes applications that control

and monitor managed devices.

The managed devices contain object variables/managed objects that define each piece of

information to be collected about a device. Examples of variables include such as number of

packets received, node port status etc. A Management Information Base (MIB) is a collection

of managed objects. SNMP allows a manager and agents to communicate for the purpose of

accessing these objects.

SNMP itself is a simple request/response protocol based on the manager/agent model. The

manager issues a request and the agent returns responses using the following protocol

operations:

Table 74 SNMP Commands

COMMAND DESCRIPTION

Get Allows the manager to retrieve an object variable from the agent.

GetNext Allows the manager to retrieve the next object variable from a table or list within

an agent. In SNMPv1, when a manager wants to retrieve all elements of a table

from an agent, it initiates a Get operation, followed by a series of GetNext

operations.

Set Allows the manager to set values for object variables within an agent.

Trap Used by the agent to inform the manager of some events.

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ZyXEL Communications IES-612-51A Guía de usuario Pagina 226