Cisco 1538 series Manual de instalação - Página 11
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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