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Recover Router Password and Secret Password

Juli 26, 2010

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.

Note: Refer to Password Recovery Procedure for the Cisco 801, 802, 803, 804, 805, 811, and 813 Series Routers in order to recover a password on the Cisco 801, 802, 803, 804, 805, 811, and 813 Series Routers.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

The information in this document is based on these hardware versions:

  • Cisco 806 Series Router
  • Cisco 826 Series Router
  • Cisco 827 Series Router
  • Cisco 828 Series Router
  • Cisco 831 Series Router
  • Cisco 836 Series Router
  • Cisco 837 Series 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

Follow these steps in order to recover your password:

Example of Password Recovery Procedure

This section provides an example of the password recovery procedure. This example was created with a Cisco 2600 Series Router. Even if you do not use a Cisco 2600 Series Router, this output provides an example of what you should experience on your product.

Router>enable

Password:

Password:

Password:

% Bad secrets

 

Router>show version

Cisco Internetwork Operating System Software

IOS ™ C2600 Software (C2600-IS-M), Version 12.0(7)T, RELEASE SOFTWARE (fc2)

Copyright (c) 1986-1999 by cisco Systems, Inc.

Compiled Tue 07-Dec-99 02:21 by phanguye

Image text-base: 0x80008088, data-base: 0x80C524F8

 

ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)

 

Router uptime is 3 minutes

System returned to ROM by abort at PC 0x802D0B60

System image file is “flash:c2600-is-mz.120-7.T”

 

cisco 2611 (MPC860) processor (revision 0x202) with 26624K/6144K bytes of memory.

Processor board ID JAB031202NK (3878188963)

M860 processor: part number 0, mask 49

Bridging software.

X.25 software, Version 3.0.0.

Basic Rate ISDN software, Version 1.1.

2 Ethernet/IEEE 802.3 interface(s)

2 Serial(sync/async) network interface(s)

1 ISDN Basic Rate interface(s)

32K bytes of non-volatile configuration memory.

8192K bytes of processor board System flash partition 1 (Read/Write)

8192K bytes of processor board System flash partition 2 (Read/Write)

 

Configuration register is 0x2102

 

Router>

 

 

 

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

!— break sequence was sent to the router.

 

 

!

 

*** System received an abort due to Break Key ***

 

signal= 0x3, code= 0x500, context= 0x813ac158

PC = 0x802d0b60, Vector = 0x500, SP = 0x80006030

rommon 1 > confreg 0x2142

 

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

 

rommon 2 > reset

 

System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)

Copyright (c) 1999 by cisco Systems, Inc.

TAC:Home:SW:IOS:Specials for info

C2600 platform with 32768 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 Internetwork Operating System Software

IOS ™ C2600 Software (C2600-IS-M), Version 12.0(7)T, RELEASE SOFTWARE (fc2)

Copyright (c) 1986-1999 by cisco Systems, Inc.

Compiled Tue 07-Dec-99 02:21 by phanguye

Image text-base: 0x80008088, data-base: 0x80C524F8

 

cisco 2611 (MPC860) processor (revision 0x202) with 26624K/6144K bytes of memory.

Processor board ID JAB031202NK (3878188963)

M860 processor: part number 0, mask 49

Bridging software.

X.25 software, Version 3.0.0.

Basic Rate ISDN software, Version 1.1.

2 Ethernet/IEEE 802.3 interface(s)

2 Serial(sync/async) network interface(s)

1 ISDN Basic Rate interface(s)

32K bytes of non-volatile configuration memory.

8192K bytes of processor board System flash partition 1 (Read/Write)

8192K bytes of processor board System flash partition 2 (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 Internetwork Operating System Software

IOS ™ C2600 Software (C2600-IS-M), Version 12.0(7)T, RELEASE SOFTWARE (fc2)

Copyright (c) 1986-1999 by cisco Systems, Inc.

Compiled Tue 07-Dec-99 02:21 by phanguye

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 < 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

BRI0/0 193.251.121.157 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 193.251.121.157 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 Internetwork Operating System Software

IOS ™ C2600 Software (C2600-IS-M), Version 12.0(7)T, RELEASE SOFTWARE (fc2)

Copyright (c) 1986-1999 by cisco Systems, Inc.

Compiled Tue 07-Dec-99 02:21 by phanguye

Image text-base: 0x80008088, data-base: 0x80C524F8

 

ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)

 

Router uptime is 3 minutes

System returned to ROM by abort at PC 0x802D0B60

System image file is “flash:c2600-is-mz.120-7.T”

 

cisco 2611 (MPC860) processor (revision 0x202)

with 26624K/6144K bytes of memory.

Processor board ID JAB031202NK (3878188963)

M860 processor: part number 0, mask 49

Bridging software.

X.25 software, Version 3.0.0.

Basic Rate ISDN software, Version 1.1.

2 Ethernet/IEEE 802.3 interface(s)

2 Serial(sync/async) network interface(s)

1 ISDN Basic Rate interface(s)

32K bytes of non-volatile configuration memory.

8192K bytes of processor board System flash partition 1 (Read/Write)

8192K bytes of processor board System flash partition 2 (Read/Write)

 

Configuration register is 0x2142

 

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 Internetwork Operating System Software

IOS ™ C2600 Software (C2600-IS-M), Version 12.0(7)T, RELEASE SOFTWARE (fc2)

Copyright (c) 1986-1999 by cisco Systems, Inc.

Compiled Tue 07-Dec-99 02:21 by phanguye

Image text-base: 0x80008088, data-base: 0x80C524F8

 

ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)

 

Router uptime is 3 minutes

System returned to ROM by abort at PC 0x802D0B60

System image file is “flash:c2600-is-mz.120-7.T”

 

cisco 2611 (MPC860) processor (revision 0x202)

with 26624K/6144K bytes of memory.

Processor board ID JAB031202NK (3878188963)

M860 processor: part number 0, mask 49

Bridging software.

X.25 software, Version 3.0.0.

Basic Rate ISDN software, Version 1.1.

 

2 Ethernet/IEEE 802.3 interface(s)

2 Serial(sync/async) network interface(s)

1 ISDN Basic Rate interface(s)

32K bytes of non-volatile configuration memory.

8192K bytes of processor board System flash partition 1 (Read/Write)

8192K bytes of processor board System flash partition 2 (Read/Write)

 

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

 

Router#

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