Cisco IOS Router Manual do Utilizador descarregar pdf (Página 10)

The Cisco IOS v1.22 – Aaron Balchunas

* * *

Aaron Balchunas (aaron@routeralley.com),

This material may be copied and used freely, but may not be altered or sold without the expressed written

consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.

Enable Passwords

The enable password protects a router’s Privileged mode. This password can

be set or changed from Global Configuration mode:

Router(config)# enable password MYPASSWORD

Router(config)# enable secret MYPASSWORD2

The enable password command sets an unencrypted password intended for

legacy systems that do not support encryption. It is no longer widely used.

The enable secret command sets an MD5-hashed password, and thus is far

more secure. The enable password and enable secret passwords cannot be

identical. The router will not accept identical passwords for these two

commands.

Line Passwords and Configuration

Passwords can additionally be configured on router lines, such as telnet

(vty), console, and auxiliary ports. To change the password for a console

port and all telnet ports:

Router(config)# line console 0

Router(config-line)# login

Router(config-line)# password cisco1234

Router(config-line)# exec-timeout 0 0

Router(config-line)# logging synchronous

Router(config)# line vty 0 4

Router(config-line)# login

Router(config-line)# password cisco1234

Router(config-line)# exec-timeout 0 0

Router(config-line)# logging synchronous

The exec-timeout 0 0 command is optional, and disables the automatic

timeout of your connection. The two zeroes represent the timeout value in

minutes and seconds, respectively. Thus, to set a timeout for 2 minutes and

30 seconds:

Router(config-line)# exec-timeout 2 30

The logging synchronous command is also optional, and prevents system

messages from interrupting your command prompt.

By default, line passwords are stored in clear-text in configuration files. To

ensure these passwords are encrypted in all configuration files:

Router(config)# service password–encryption

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Cisco IOS Router Manual do Utilizador Página 10