Contents

Introduction

Prerequisites

Requirements

Components Used

Conventions

Background Information

Step-by-Step Procedure

Example of Password Recovery Procedure

Related Information

Introduction

This document describes how to recover the enable password and the enable secret passwords from your router.

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, ensure that you understand the potential impact of any command.

Conventions

Refer to Cisco Technical Tips Conventions for information on document conventions.

Background Information

These passwords protect access to privileged EXEC and configuration modes. The enable 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.

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:

- Configure Cable Requirements for Console and AUX Ports

- Understand the Terminal Connection to a Console Port on Catalyst Switches

2. If you can access the router, type show version at the prompt, and record the configuration register value. See the Example of Password Recovery Procedure section 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.

4. Press Break on the terminal keyboard a couple of times after you see the message program load complete, entry point: 0x80008000, size: 0x6fdb4c 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 Use Standard Break Key Sequence Combinations for Password Recovery for other key combinations.

If unable to break into ROMMON mode, perform these steps:

1. Remove flash.

2. Reload the router. Router ends up in ROMMON mode.

3. Insert flash.

4. 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 to skip the initial setup procedure.

8. Type enable at the Router> prompt.

You are in enable mode and you 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.

11. Type configure terminal .

The hostname(config)# prompt appears.

12. Type enable secret <password> 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 must display up up .

14. Type config-register <configuration_register_value>. Whereconfiguration_register_value is either the value you recorded in step 2 or0x2102 . 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.

Example of Password Recovery Procedure

This section provides an example of the password recovery procedure. This example was created with a Cisco 2900 Series ISR. Even if you do not use a Cisco 2900 Series ISR, this output provides an example of what you experience on your product.

Router>enable

Password:

Password:

Password:

% Bad secrets

Router>show version

Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.0(1)M1,

RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2009 by Cisco Systems, Inc.

Compiled Wed 02-Dec-09 15:23 by prod_rel_team

ROM: System Bootstrap, Version 15.0(1r)M1, RELEASE SOFTWARE (fc1)

c2921-CCP-1-xfr uptime is 2 weeks, 22 hours, 15 minutes

System returned to ROM by reload at 06:06:52 PCTime Mon Apr 2 1900

System restarted at 06:08:03 PCTime Mon Apr 2 1900

System image file is "flash:c2900-universalk9-mz.SPA.150-1.M1.bin"

Last reload reason: Reload Command

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to

export@cisco.com.

Cisco CISCO2921/K9 (revision 1.0) with 475136K/49152K bytes of memory.

Processor board ID FHH1230P04Y

1 DSL controller

3 Gigabit Ethernet interfaces

9 terminal lines

1 Virtual Private Network (VPN) Module

1 Cable Modem interface

1 cisco Integrated Service Engine-2(s)

Cisco Foundation 2.2.1 in slot 1

DRAM configuration is 64 bits wide with parity enabled.

255K bytes of non-volatile configuration memory.

248472K bytes of ATA System CompactFlash 0 (Read/Write)

62720K bytes of ATA CompactFlash 1 (Read/Write)

Technology Package License Information for Module:'c2900'

----------------------------------------------------------------

Technology    Technology-package          Technology-package

Current       Type          Next reboot

-----------------------------------------------------------------

ipbase        ipbasek9      Permanent     ipbasek9

security      securityk9    Permanent     securityk9

uc            uck9          Permanent     uck9

data          datak9        Permanent     datak9

Configuration register is 0x2102

Router>

!--- The router was just powercycled, and during bootup a

!--- break sequence was sent to the router after seeing the following message

!--- program load complete, entry point: 0x80008000, size: 0x6fdb4c.

rommon 1 > confreg 0x2142

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

rommon 2 > reset

System Bootstrap, Version 15.0(1r)M1, RELEASE SOFTWARE (fc1)

Copyright (c) 2009 by cisco Systems, Inc.

TAC:Home:SW:IOS:Specials for info

C2900 platform with 524288 Kbytes of main memory

program load complete, entry point: 0x80008000, size: 0x6fdb4c

Self decompressing the image : ###############################

##############################################################

##############################################################

##############################################################

############################### [OK]

Restricted Rights Legend

Use, duplication, or disclosure by the Government is

subject to restrictions as set forth in subparagraph

(c) of the Commercial Computer Software - Restricted

Rights clause at FAR sec. 52.227-19 and subparagraph

(c) (1) (ii) of the Rights in Technical Data and Computer

Software clause at DFARS sec. 252.227-7013.

cisco Systems, Inc.

170 West Tasman Drive

San Jose, California 95134-1706

Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.0(1)M1,

RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2009 by Cisco Systems, Inc.

Compiled Wed 02-Dec-09 15:23 by prod_rel_team

Cisco CISCO2921/K9 (revision 1.0) with 475136K/49152K bytes of memory.

Processor board ID FHH1230P04Y

1 DSL controller

3 Gigabit Ethernet interfaces

9 terminal lines

1 Virtual Private Network (VPN) Module

1 Cable Modem interface

1 cisco Integrated Service Engine-2(s)

Cisco Foundation 2.2.1 in slot 1

DRAM configuration is 64 bits wide with parity enabled.

255K bytes of non-volatile configuration memory.

248472K bytes of ATA System CompactFlash 0 (Read/Write)

62720K bytes of ATA CompactFlash 1 (Read/Write)

--- System Configuration Dialog ---

Would you like to enter the initial configuration dialog? [yes/no]:  n

Press RETURN to get started!

00:00:19: %LINK-3-UPDOWN: Interface BRI0/0, changed state to up

00:00:19: %LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up

00:00:19: %LINK-3-UPDOWN: Interface Ethernet0/1, changed state to up

00:00:19: %LINK-3-UPDOWN: Interface Serial0/0, changed state to down

00:00:19: %LINK-3-UPDOWN: Interface Serial0/1, changed state to down

00:00:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0/0,

changed state to down

00:00:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0,

changed state to up

Router>

00:00:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/1,

changed state to up

00:00:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0,

changed state to down

00:00:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1,

changed state to down

00:00:50: %SYS-5-RESTART: System restarted --

Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.0(1)M1,

RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2009 by Cisco Systems, Inc.

Compiled Wed 02-Dec-09 15:23 by prod_rel_team

00:00:50: %LINK-5-CHANGED: Interface BRI0/0,

changed state to administratively down

00:00:52: %LINK-5-CHANGED: Interface Ethernet0/0,

changed state to administratively down

00:00:52: %LINK-5-CHANGED: Interface Serial0/0,

changed state to administratively down

00:00:52: %LINK-5-CHANGED: Interface Ethernet0/1,

changed state to administratively down

00:00:52: %LINK-5-CHANGED: Interface Serial0/1,

changed state to administratively down

00:00:53: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0,

changed state to down

00:00:53: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/1,

changed state to down

Router>

Router>enable

Router#copy startup-config running-config

Destination filename [running-config]?

1324 bytes copied in 2.35 secs (662 bytes/sec)

Router#

00:01:24: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0/0:1,

changed state to down

00:01:24: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0/0:2,

changed state to down

Router#configure terminal

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

Router(config)#enable secret <new-password>

Router(config)#^Z

00:01:54: %SYS-5-CONFIG_I: Configured from console by console

Router#show ip interface brief

Interface   IP-Address        OK?  Method     Status                   Protocol

Ethernet0/0 10.200.40.37      YES  TFTP       administratively down    down

Serial0/0   unassigned        YES  TFTP       administratively down    down

BRI0/0      192.168.121.157   YES  unset      administratively down    down

BRI0/0:1    unassigned        YES  unset      administratively down    down

BRI0/0:2    unassigned        YES  unset      administratively down    down

Ethernet0/1 unassigned        YES  TFTP       administratively down    down

Serial0/1   unassigned        YES  TFTP       administratively down    down

Loopback0   192.168.121.157   YES  TFTP       up                       up

Router#configure terminal

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

Router(config)#interface Ethernet0/0

Router(config-if)#no shutdown

Router(config-if)#

00:02:14: %LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up

00:02:15: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/0,

changed state to up

Router(config-if)#interface BRI0/0

Router(config-if)#no shutdown

Router(config-if)#

00:02:26: %LINK-3-UPDOWN: Interface BRI0/0:1, changed state to down

00:02:26: %LINK-3-UPDOWN: Interface BRI0/0:2, changed state to down

00:02:26: %LINK-3-UPDOWN: Interface BRI0/0, changed state to up

00:02:115964116991: %ISDN-6-LAYER2UP: Layer 2 for Interface BR0/0,

TEI 68 changed to up

Router(config-if)#^Z

Router#

00:02:35: %SYS-5-CONFIG_I: Configured from console by console

Router#copy running-config startup-config

Destination filename [startup-config]?

Building configuration...

[OK]

Router#show version

Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.0(1)M1,

RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2009 by Cisco Systems, Inc.

Compiled Wed 02-Dec-09 15:23 by prod_rel_team

ROM: System Bootstrap, Version 15.0(1r)M1, RELEASE SOFTWARE (fc1)

c2921-CCP-1-xfr uptime is 2 weeks, 22 hours, 15 minutes

System returned to ROM by reload at 06:06:52 PCTime Mon Apr 2 1900

System restarted at 06:08:03 PCTime Mon Apr 2 1900

System image file is "flash:c2900-universalk9-mz.SPA.150-1.M1.bin"

Last reload reason: Reload Command

Cisco CISCO2921/K9 (revision 1.0) with 475136K/49152K bytes of memory.

Processor board ID FHH1230P04Y

1 DSL controller

3 Gigabit Ethernet interfaces

9 terminal lines

1 Virtual Private Network (VPN) Module

1 Cable Modem interface

1 cisco Integrated Service Engine-2(s)

Cisco Foundation 2.2.1 in slot 1

DRAM configuration is 64 bits wide with parity enabled.

255K bytes of non-volatile configuration memory.

248472K bytes of ATA System CompactFlash 0 (Read/Write)

62720K bytes of ATA CompactFlash 1 (Read/Write)

Configuration register is 0x2102

Router#configure terminal

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

Router(config)#config-register 0x2102

Router(config)#^Z

00:03:20: %SYS-5-CONFIG_I: Configured from console by console

Router#show version

Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.0(1)M1,

RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2009 by Cisco Systems, Inc.

Compiled Wed 02-Dec-09 15:23 by prod_rel_team

ROM: System Bootstrap, Version 15.0(1r)M1, RELEASE SOFTWARE (fc1)

c2921-CCP-1-xfr uptime is 2 weeks, 22 hours, 15 minutes

System returned to ROM by reload at 06:06:52 PCTime Mon Apr 2 1900

System restarted at 06:08:03 PCTime Mon Apr 2 1900

System image file is "flash:c2900-universalk9-mz.SPA.150-1.M1.bin"

Last reload reason: Reload Command

Cisco CISCO2921/K9 (revision 1.0) with 475136K/49152K bytes of memory.

Processor board ID FHH1230P04Y

1 DSL controller

3 Gigabit Ethernet interfaces

9 terminal lines

1 Virtual Private Network (VPN) Module

1 Cable Modem interface

1 cisco Integrated Service Engine-2(s)

Cisco Foundation 2.2.1 in slot 1

DRAM configuration is 64 bits wide with parity enabled.

255K bytes of non-volatile configuration memory.

248472K bytes of ATA System CompactFlash 0 (Read/Write)

62720K bytes of ATA CompactFlash 1 (Read/Write)

Configuration register is 0x2142 (will be 0x2102 at next reload)

Router#

Related Information

- Example of Password Recovery Procedure

- Configure Cable Requirements for Console and AUX Ports

- Understand the Terminal Connection to a Console Port on Catalyst Switches

- Routers Product Support

- Cisco Technical Support & Downloads