Cisco 600W User Manual download pdf (Page 17)

Overview 1-17

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 2-23 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 1-7 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 1-7 SNMP Network

Note Make sure you use the correct Read and Write community strings so that your

SNMP request does not fail. Refer to the SNMP Management Page for the correct

community strings.

Get-request, Get-next-request,

Get-bulk, Set-request

Network device

Get-response, traps

S1203a

SNMP Manager

NMS

MIB

SNMP Agent

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Cisco 600W User Manual Page 17