Cisco Catalyst 2900 Series XL Especificaciones descargar pdf (Pagina 88)

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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide

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Chapter 4 General Switch Administration

SNMP Network Management Platforms

Using FTP to Access the MIB Files

You can obtain each MIB file with this procedure:

Step 1 Use FTP to access the server ftp.cisco.com.

Step 2 Log in with the username anonymous.

Step 3 Enter your e-mail username when prompted for the password.

Step 4 At the ftp> prompt, change directories to /pub/mibs/supportlists.

Step 5 Change directories to one of the following:

• wsc2900xl for a list of Catalyst 2900 XL MIBs

• wsc3500xl for a list of Catalyst 3500 XL MIBs

Step 6 Use the get MIB_filename command to obtain a copy of the MIB file.

You can also access this server from your browser by entering this URL in the Location field of your

Netscape browser (the Address field in Internet Explorer):

ftp://ftp.cisco.com

Use the mouse to navigate to the folders listed above.

Using SNMP to Access MIB Variables

The switch MIB variables are accessible through SNMP, an application-layer protocol facilitating the

exchange of management information between network devices. The SNMP system consists of three

parts:

• The SNMP manager, which resides on the network management system (NMS)

• The SNMP agent, which resides on the switch

• The MIBs that reside on the switch but that can be compiled with your network management

software

An example of an NMS is the CiscoWorks network management software. CiscoWorks2000 software

uses the switch 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 to troubleshoot

internetworking problems, increase network performance, verify the configuration of devices, monitor

traffic loads, and more.

As shown in Figure 4-1, the SNMP agent gathers data from the MIB, which is the repository for

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

certain events, to the SNMP manager, which receives and processes the traps. Traps are messages

alerting the SNMP manager to a condition on the network such as improper user authentication, restarts,

link status (up or down), and so forth. In addition, the SNMP agent responds to MIB-related queries sent

by the SNMP manager in get-request, get-next-request, and set-request format.

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Cisco Catalyst 2900 Series XL Especificaciones Pagina 88