Cisco Systems Dial NMS Instructions d'exploitation télécharger pdf (Page 15)

Overview of Basic SNMP Building Blocks

About Basic SNMP Message Types and Commands

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Basic Dial NMS Implementation Guide

Figure 1 illustrates the relationship between the managed devices, the agent, and the NMS.

Figure 1 An SNMP-Managed Network

About Basic SNMP Message Types and Commands

There are three basic SNMP message types:

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Get

—NMS-initiated requests used by an NMS to monitor managed devices. The NMS examines

different variables that are maintained by managed devices.

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Set

—NMS-initiated commands used by an NMS to control managed devices. The NMS changes

the values of variables stored within managed devices.

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Trap

—Agent-initiated messages sent from a managed device, which reports events to the NMS.

The Cisco IOS generates SNMP traps for many distinct network conditions. Through SNMP traps,

the Network Operations Center (NOC) is notified of network events, such as:

Link up/down changes

Configuration changes

Temperature thresholds

CPU overloads

Note

For a list of Cisco-supported SNMP traps, go to

http://www.cisco.com/public/mibs/traps/

Management

Entity

Agent

Management

Database

Agent

NMS

Management

Database

Managed Devices

Agent

Management

Database

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Cisco Systems Dial NMS Instructions d'exploitation Page 15