Datasheet

OL-17436-01

Additional Configuration and Maintenance Tasks

You must reset or power cycle for the new config to take effect

Step 7 Initialize the router by entering the i command as follows:

Rommon 1> i

The router power cycles, the configuration register is set to ignore the configuration file, and the router

boots the boot system image and prompts you with the system configuration dialog as follows:

--- System Configuration Dialog ---

Step 8 Enter no in response to the system configuration dialog prompts until the following system message is

displayed:

Press RETURN to get started!

Step 9 Press Return.

After some interface information displays, the prompt appears as follows:

Router>

Step 10 Enter the enable command to enter enabled mode.

The prompt changes to the following:

Router#

Step 11 Enter the show start-up config EXEC command to display the enable password in the configuration file.

Step 12 Enter the configure terminal command at the EXEC prompt.

You are prompted as follows:

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)#

Change the configuration register value back to its original value (noted from Step 3.)

Change it to a value of 0x0102 (factory default) using the config-register 0x value command.

Step 13 Press Ctrl-Z or type end to exit configuration mode.

Step 14 Reboot the router and enable it using the recovered password.

Recovering Password for IOS XR

If the root password is forgotten, it can be recovered only at the DSC. To recover the password at the

DSC, set the configuration register to 0x42 on the active RP and reboot the router. When the router boots,

a password recovery dialog appears. This dialog prompts you to reset the root-system username and

password. After you save the new password, the configuration register automatically resets to the prior

value (such as 0x102).

This chapter also includes instructions to bypass ksh authentication on a node.

This chapter contains the following sections:

• Recovering the Root Password on Single-RP Routers, page 77

• Recovering the Root Password on Redundant-RP Routers, page 77