Installation guide

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Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide

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Chapter 2 Configuring the Cisco CMTS for the First Time

Understanding Configuration Fundamentals

Replacing or Recovering a Lost Password

This section describes how to recover a lost enable or console login password, and how to replace a lost

enable secret password on your Cisco uBR7100 series router.

Note It is possible to recover the enable or console login password. The enable secret password is encrypted,

however, and must be replaced with a new enable secret password.

Overview of the Password Recovery Procedure

Following is an overview of the general steps in the password recovery procedure:

Step 1 If you can log in to the router, enter the show version command to determine the existing configuration

Step 2 Press the Break key to get to the bootstrap program prompt (ROM monitor). You might need to reload

the system image by power cycling the router.

Step 3 Change the configuration register so that the following functions are enabled:

–

Break

–

ignore startup configuration

–

boot from Flash memory

Note The key to recovering a lost password is to set the configuration register bit 6 (0x0040) so that

the startup configuration (usually in NVRAM) is ignored. This allows you to log in without

using a password and to display the startup configuration passwords. Cisco recommends setting

the configuration register to 0x142.

Step 4 Power cycle the router by turning power OFF and then back ON.

Step 5 Log in to the router and enter the privileged EXEC mode.

Step 6 Enter the show startup-config command to display the passwords.

Step 7 Recover or replace the displayed passwords.

Step 8 Change the configuration register back to its original setting.

Note To recover a lost password if Break is disabled on the router, you must have physical access to the router.

Details of the Password Recovery Procedure

Complete the following steps to recover or replace a lost enable, enable secret, or console login

password:

Step 1 Attach an ASCII terminal to the console port on your Cisco uBR7100 series router.

Step 2 Configure the terminal to operate at 9600 baud, 8 data bits, no parity, and 2 stop bits.