ZyXEL P-2812HNU-51c User Manual download pdf (Page 334)

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Chapter 21 Remote Management

P-2812HNU-51c User’s Guide

334

21.4 The SNMP Screen

Simple Network Management Protocol (SNMP) is a protocol used for exchanging

management information between network devices. Your P-2812HNU-51c

supports SNMP agent functionality, which allows a manager station to manage and

monitor the P-2812HNU-51c through the network.

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

P-2812HNU-51c). An agent translates the local management information from the

managed switch 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 switch. Examples of variables include

number of packets received, node port status and so on. 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 114 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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