Cisco 1538 series 설치 매뉴얼 - 페이지 11

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1. Default Configuration Settings

Overview of SNMP

You can configure and monitor the hub by accessing the Management Information Base

(MIB) variables through Simple Network Management Protocol (SNMP), an

application-layer protocol facilitating the exchange of management information between

network devices. The hub supports a comprehensive set of MIB objects, including four

Remote Monitoring (RMON) groups. (The "Accessing the MIB Files through SNMP"

section on page 2-29 provides information about the MIB files and about accessing them.)

The SNMP system consists of three parts: SNMP manager, SNMP agent, and the MIB files.

SNMP places all operations in a get-request, get-next-request, and set-request format. For

example, an SNMP manager can get a value from an SNMP agent or store a value into that

SNMP agent. The SNMP manager can be part of a network management system (NMS),

and the SNMP agent can reside on a networking device such as a hub. You can compile the

hub MIB files with your network management software. The SNMP agent can respond to

MIB-related queries being sent by the NMS.

An example of an NMS is the CiscoWorks network management software. CiscoWorks

uses the hub MIB variables to set device variables and to poll devices on the network for

specific information. The results of a poll can be displayed as a graph and analyzed in order

to troubleshoot internetworking problems, increase network performance, verify the

configuration of devices, monitor traffic loads, and more.

Figure 1-5 shows how the SNMP agent gathers data from the MIB file, which holds

information about device parameters and network data. The agent can send traps, or

notification of certain events, to the manager.

Figure 1-5

SNMP manager

SNMP Network

Get-request, Get-next-request,

NMS

Get-bulk, Set-request

Get-response, traps

Overview of SNMP

Network device

MIB

SNMP agent

Overview 1-11