Cisco 2525 Betriebsanweisung PDF herunterladen (Seite 127)

Maintaining the Cisco 2524 and Cisco 2525 Routers A-15

Recovering Lost Passwords

Step 5 Reinstall the chassis on the wall, rack, desktop, or table.

Step 6 Replace all cables.

Recovering Lost Passwords

This section explains how to recover the following types of passwords:

• An enable secret password (a very secure, encrypted password). The enable secret

password is available on routers running Cisco IOS Release 10.3(2) or later.

• An enable password (a less secure, nonencrypted password). The enable password is

used when the enable secret password does not exist.

• A console password. The console password is used to prevent unauthorized users from

attempting to change the router conﬁguration. When a console password is set, you must

provide a password to log in to the console and access user EXEC mode.

The key to recovering a lost enable password is to set the conﬁguration register so that the

contents of NVRAM are ignored (0x142), which allows you to see your password. The

enable secret password is encrypted and cannot be recovered; it must be replaced. The

enable and console passwords might be encrypted or clear text.

Take the following steps to recover a lost password:

Step 1 Plan for some system downtime. The password recovery procedure requires a

system reload.

Step 2 Connect a terminal to the console port on the rear panel of the router. Make sure

the terminal is conﬁgured to operate at 9600 baud, 8 data bits, no parity, and 2 stop

bits.

Step 3 Enter the show version command to display the existing conﬁguration register

value. The conﬁguration register value is on the last line of the display. Note

whether the conﬁguration register is set to enable or disable Break.

The factory-default conﬁguration register value is 0x2102. Notice that the third

digit from the left in 0x2102 is 1, which disables Break. If the third digit is not 1,

Break is enabled.

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Cisco 2525 Betriebsanweisung Seite 127