ZyXEL P-2302R Bedienungsanleitung PDF herunterladen (Seite 164)

P-2302R Series User’s Guide

163 Chapter 16 Remote Management Screens

Figure 65 SNMP Management Model

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

An agent is a management software module that resides in a managed device (the Prestige).

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:

• 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 P-2302R Bedienungsanleitung Seite 164