Cisco Catalyst 2900 Series XL Especificaciones descargar pdf (Pagina 133)

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

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Chapter 6 Configuring the System

Configuring CDP

Configuring the Network Time Protocol

In complex networks, it is often prudent to distribute time information from a central server. The

Network Time Protocol (NTP) can distribute time information by responding to requests from clients or

by broadcasting time information.

For CLI procedures, refer to the Cisco IOS Release 12.0 documentation on Cisco.com for additional

information and CLI procedures.

Configuring the Switch as an NTP Client

You configure the switch as an NTP client by entering the IP addresses of up to ten NTP servers and

specifying which server should be used first. You can also enter an authentication key to be used as a

password when requests for time information are sent to the server.

Enabling NTP Authentication

To ensure the validity of information received from NTP servers, you can authenticate NTP messages

with public-key encryption. This procedure must be coordinated with the administrator of the NTP

servers: the information you enter will be matched by the servers to authenticate it.

Configuring the Switch for NTP Broadcast-Client Mode

You can configure the switch to receive NTP broadcast messages if there is an NTP broadcast server,

such as a router, broadcasting time information on the network. You can also enter a value to account for

any round-trip delay between the client and the NTP broadcast server.

Configuring CDP

Use the Cisco IOS CLI and Cisco Discovery Protocol (CDP) to enable CDP for the switch, set global

CDP parameters, and display information about neighboring Cisco devices.

CDP enables the Cluster Management Suite to display a graphical view of the network. For example, the

switch uses CDP to find cluster candidates and to maintain information about cluster members and other

devices up to three cluster-enabled devices away from the command switch.

If necessary, you can configure CDP to discover switches running the Cluster Management Suite up to

seven devices away from the command switch. Devices that do not run clustering software display as

edge devices, and CDP cannot discover any device connected to them.

Note Creating and maintaining switch clusters is based on the regular exchange of CDP messages.

Disabling CDP can interrupt cluster discovery. For more information about the role that CDP plays

in clustering, see the “Automatic Discovery of Cluster Candidates and Members” section on

page 5-4.

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Cisco Catalyst 2900 Series XL Especificaciones Pagina 133