Introduction
This
document describes how to recover the enable password and
the enable
secret passwords. These passwords
protect access to privileged EXEC and configuration modes. The enable password password can be recovered, but the enable secret password is encrypted and must be replaced with a new
password. Use the procedure described in this document in order to replace
the enable
secret password.
Prerequisites
Requirements
There are no specific requirements
for this document.
Components Used
The information in this document is
based on this hardware version:
·
Cisco
1900 Series Integrated Services Router
The information in this document was
created from the devices in a specific lab environment. All of the devices used
in this document started with a cleared (default) configuration. If your
network is live, make sure that you understand the potential impact of any
command.
Related Products
Refer
to Password
Recovery Procedures for
information on how to recover passwords for related products.
Conventions
Refer
to Cisco Technical Tips Conventions for information on
document conventions.
Step-by-Step Procedure
Perform these steps in order to
recover your password:
1. Attach a terminal or PC with
terminal emulation to the console port of the router. Use these terminal
settings:
·
9600 baud
rate
·
No parity
·
8 data
bits
·
1 stop
bit
·
No flow
control
Refer to these documents for
information on how to cable and connect a terminal to the console port or the
AUX port:
·
Cabling Guide for Console and AUX Ports
·
Connecting a Terminal to the Console Port on Catalyst Switches
·
Connect a Terminal to Catalyst 2948G-L3, 4908G-L3, and 4840G
Series Switches
2.
If you
can access the router, type show version at
the prompt, and record the configuration register setting. See Example of Password Recovery Procedure in order to
view the output of a show version command.
Note: The configuration register is
typically set to 0x2102 or 0x102. If you can no longer access the router
(because of a lost login or TACACS password), you can safely assume that your
configuration register is set to 0x2102.
3. Use the power switch in order to
turn off the router, and then turn the router back on.
Note:
·
In order
to simulate this step on a Cisco 6400, pull out and then plug in the Node Route
Processor (NRP) or Node Switch Processor (NSP) card.
·
In order
to simulate this step on a Cisco 6x00 with NI-2, pull out and then plug in the
NI-2 card.
4.
Press Break on the terminal keyboard a couple of times
after you see the message program load complete, entry
point: 0x80008000, size: 0x6fdb4c in order to put the router into ROMMON.
Note: The values of entry point and
size are subjected to the routers.
If the
break sequence does not work, refer to Standard Break Key Sequence Combinations During Password Recovery for
other key combinations.
If unable to break into ROMMON
mode, perform these steps:
a. Remove flash.
b. Reload the router. Router will
end up in ROMMON mode.
c. Insert flash.
d. Perform standard procedure for
password recovery.
5.
Type confreg 0x2142 at the rommon
1> prompt
in order to boot from Flash.
This step bypasses the startup
configuration where the passwords are stored.
6.
Type reset at the rommon
2> prompt.
The router reboots, but ignores
the saved configuration.
7.
Type no after each setup question, or press Ctrl-C in order to skip the initial setup
procedure.
8.
Type enable at the Router> prompt.
You are
in enable mode and should see the Router# prompt.
9.
Type configure memory or copy startup-config running-config in order to
copy the nonvolatile RAM (NVRAM) into memory.
Warning: Do not enter copy running-config
startup-config or write. These
commands erase your startup configuration.
10.
Type show running-config.
The show running-config command shows the
configuration of the router. In this configuration, the shutdown command appears under all interfaces,
which indicates all interfaces are currently shut down. In addition, the
passwords (enable password, enable secret, vty, console passwords) are in
either an encrypted or unencrypted format. You can reuse unencrypted passwords.
You must change encrypted passwords to a new password.
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11.
Type configure terminal.
The hostname(config)# prompt appears.
12. Type enable secret <password> in order to change the enable secret password. For example:
hostname(config)#enable secret cisco
13.
Issue
the no shutdown command on every interface that you
use.
If you
issue a show ip interface brief command, every interface
that you want to use should display up up.
14.
Type config-register <configuration_register_setting> . Where configuration_register_setting is either the value you recorded in step 2
or 0x2102 . For example:
hostname(config)#config-register 0x2102
15.
Press Ctrl-z or end in order to
leave the configuration mode.
The hostname# prompt appears.
16.
Type write memory or copy running-config
startup-config in order to commit the changes.
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