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Cisco 4500 Series Password Recovery


wildweaselmi
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Step-by-Step Procedure

Complete these steps to recover your password:

Note: Make sure that you have physical access to the switch and that you use console access to the Supervisor Engine module while you perform these steps. For details on the switch console connection, refer to Connecting a Modem to the Console Port on Catalyst Switches.

Tip: Configuration of the switch is not lost if the procedure is followed as mentioned. As a best practice, Cisco recommends that you have a backup copy of the configuration of all Cisco devices at the TFTP server or a Network Management server.

  1. Power cycle the device.

    In order to power cycle, turn the device off, then back on.

    Press Ctrl-C within 5 seconds to prevent autoboot. This action puts you in ROM monitor (ROMmon) prompt mode.

    !--- Here, you power cycle the switch.

    **********************************************************

    * *

    * Welcome to ROM Monitor for WS-X4014 System. *

    * Copyright © 1999-2000, 2001 by Cisco Systems, Inc. *

    * All rights reserved. *

    * *

    **********************************************************

    ROM Monitor Program Version 12.1(10r)EY(1.21)

    Board type 1, Board revision 7

    Swamp FPGA revision 16, Dagobah FPGA revision 43

    Timer interrupt test passed.

    MAC Address : 00-02-b9-83-af-fe

    IP Address : 172.16.84.122

    Netmask : 255.255.255.0

    Gateway : 172.16.84.1

    TftpServer : Not set.

    Main Memory : 256 MBytes

    ***** The system will autoboot in 5 seconds *****

    Type control-C to prevent autobooting.

    !--- At this point, press
    Ctrl-C
    .

    Autoboot cancelled......... please wait!!!

    Autoboot cancelled......... please wait!!!

    rommon 1
    > [interrupt]

    !--- The module ended in the ROMmon.

    rommon 1
    > [interrupt]

  2. Issue the confreg command at the rommon prompt.

    Make the selections that appear here in boldface for password recovery:

    rommon 1 > set

    rommon 1 > confreg

    Configuration Summary :

    => load ROM after netboot fails

    => console baud: 9600

    => autoboot from: commands specified in 'BOOT' environment variable

    do you wish to change the configuration? y/n :
    y

    enable "diagnostic mode"? y/n :
    n

    enable "use net in IP bcast address"? y/n :
    n

    disable "load ROM after netboot fails"? y/n :
    n

    enable "use all zero broadcast"? y/n :
    n

    enable "break/abort has effect"? y/n :
    n

    enable "ignore system config info"? y/n :
    y

    change console baud rate? y/n :
    n

    change the boot characteristics? y/n :
    n

    Configuration Summary :

    => load ROM after netboot fails

    => ignore system config info

    => console baud: 9600

    => autoboot from: commands specified in 'BOOT' environment variable

    do you wish to save this configuration? y/n :
    y

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

    Note: You can also use the confreg 0x2142 command at the ROMmon prompt in order to set the configuration register value to bypass the startup configuration stored in NVRAM.

    rommon 1 >confreg 0x2142

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

  3. Issue the reset command so that the module reboots.

    Due to the changes that you made in step 2, the module reboots but ignores the saved configuration.

    rommon 2 > reset

    Resetting .......

    rommon 3 >

    **********************************************************

    * *

    * Welcome to ROM Monitor for WS-X4014 System. *

    * Copyright © 1999-2000, 2001 by Cisco Systems, Inc. *

    * All rights reserved. *

    * *

    **********************************************************

    !--- Output suppressed.

    Press RETURN to get started!

    !--- Press
    Return
    .

    00:00:21: %SYS-5-RESTART: System restarted --

    Cisco Internetwork Operating System Software

    IOS Catalyst 4000 L3 Switch Software (cat4000-IS-M),

    Version 12.1(8a)EW, RELEASE SOFTWARE (fc1)

    TAC Support:

    Copyright © 1986-2002 by cisco Systems, Inc.

    Compiled Thu 24-Jan-02 17:34 by ccai

    00:00:21: %SNMP-5-COLDSTART: SNMP agent on host Switch

    is undergoing a cold start

    Switch>

  4. Make sure that the configuration register value is 0x2142.

    This value makes the module boot from Flash without a load of the saved configuration. Issue the enable command at the Switch prompt to go to enable mode. Then, issue the show version command to check the configuration register value.

    Switch> enable

    Switch#
    show version

    Cisco Internetwork Operating System Software

    IOS Catalyst 4000 L3 Switch Software (cat4000-IS-M),

    Version 12.1(8a)EW, RELEASE SOFTWARE (fc1)

    TAC Support:

    Copyright © 1986-2002 by cisco Systems, Inc.

    Compiled Thu 24-Jan-02 17:34 by ccai

    Image text-base: 0x00000000, data-base: 0x00AA2B8C

    ROM: 12.1(10r)EY(1.21)

    Switch uptime is 5 minutes

    System returned to ROM by reload

    Running default software

    cisco WS-C4006 (MPC8245) processor (revision 7) with 262144K bytes of memory.

    Processor board ID FOX04183666

    Last reset from Reload

    32 Gigabit Ethernet/IEEE 802.3 interface(s)

    467K bytes of non-volatile configuration memory.

    Configuration register is 0x2142

    Switch#

  5. Issue the configure memory command or the copy startup-config running-config command to copy the NVRAM into memory.

    Do not issue the configure terminal command, which shows the default configuration on the module.

    Switch#configure memory

    Uncompressed configuration from 1307 bytes to 3014 bytes

    Switch#

    00:13:52: %SYS-5-CONFIG_I: Configured from memory by console

    c-4006-SUPIII#

  6. Issue the show ip interface brief command to make sure that the interfaces that were in use earlier show an "up up" status.

    If any of the interfaces that were in use before the password recovery show "down", issue the no shutdown command on that interface to bring the interface up.

  7. Issue the write terminal command or the show running-config command to display the saved configuration on the module.

    c-4006-SUPIII#show running-config 

    Building configuration...

    Current configuration : 3014 bytes

    !

    version 12.1

    no service pad

    service timestamps debug uptime

    service timestamps log uptime

    no service password-encryption

    service compress-config

    !

    hostname c-4006-SUPIII

    !

    boot system flash bootflash:

    !

    vtp mode transparent

    !--- Output suppressed.

    line con 0

    stopbits 1

    line vty 0 4

    login

    !

    end

    c-4006-SUPIII#

    Now you are ready to change the password on the module.

  8. Issue these commands to change the password:

    c-4006-SUPIII#configure terminal 

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

    c-4006-SUPIII(config)#
    no enable secret

    !--- This step is necessary if the switch had an enable

    !--- secret password.

    c-4006-SUPIII(config)#
    enable secret < password >

    !--- This command sets the new password.

  9. Make sure that you change the configuration register value back to 0x2102.

    Complete these steps at the config prompt to change and verify the configuration register value.

    c-4006-SUPIII(config)#config-register 0x2102

    c-4006-SUPIII(config)#
    ^Z

    c-4006-SUPIII#

    00:19:01: %SYS-5-CONFIG_I: Configured from console by console

    c-4006-SUPIII#
    write memory

    !--- This step saves the configuration.

    Building configuration...

    Compressed configuration from 3061 bytes to 1365 bytes

    c-4006-SUPIII#
    show version

    !--- This step verifies the value change.

    Cisco Internetwork Operating System Software

    IOS Catalyst 4000 L3 Switch Software (cat4000-IS-M),

    Version 12.1(8a)EW, RELEASE SOFTWARE (fc1)

    TAC Support:

    Copyright © 1986-2002 by cisco Systems, Inc.

    Compiled Thu 24-Jan-02 17:34 by ccai

    Image text-base: 0x00000000, database: 0x00AA2B8C

    ROM: 12.1(10r)EY(1.21)

    c-4006-SUPIII uptime is 20 minutes

    System returned to ROM by reload

    Running default software

    cisco WS-C4006 (MPC8245) processor (revision 7) with 262144K bytes of memory.

    Processor board ID FOX04183666

    Last reset from Reload

    32 Gigabit Ethernet/IEEE 802.3 interface(s)

    467K bytes of nonvolatile configuration memory.

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

    c-4006-SUPIII#

    At this point, you have changed the password.

Sample Output/Example Procedure

This sample output is the result of the password recovery procedure on a Catalyst 4000 Supervisor Engine III.

c-4006-SUPIII> enable

Password:

Password:

Password:

% Bad secrets

!--- Here, you power cycle the switch.

**********************************************************

* *

* Welcome to ROM Monitor for WS-X4014 System. *

* Copyright © 1999-2000, 2001 by Cisco Systems, Inc. *

* All rights reserved. *

* *

**********************************************************

ROM Monitor Program Version 12.1(10r)EY(1.21)

Board type 1, Board revision 7

Swamp FPGA revision 16, Dagobah FPGA revision 43

Timer interrupt test passed.

MAC Address : 00-02-b9-83-af-fe

IP Address : 172.16.84.122

Netmask : 255.255.255.0

Gateway : 172.16.84.1

TftpServer : Not set.

Main Memory : 256 Mbytes

***** The system will autoboot in 5 seconds *****

Type control-C to prevent autobooting.

!--- At this point, press
Ctrl-C
.

Autoboot cancelled......... please wait!!!

Autoboot cancelled......... please wait!!!

rommon 1 > [interrupt]

rommon 1 > [interrupt]

rommon 1 >
confreg

Configuration Summary :

=> load ROM after netboot fails

=> console baud: 9600

=> autoboot from: commands specified in 'BOOT' environment variable

do you wish to change the configuration? y/n :
y

enable "diagnostic mode"? y/n :
n

enable "use net in IP bcast address"? y/n :
n

disable "load ROM after netboot fails"? y/n :
n

enable "use all zero broadcast"? y/n :
n

enable "break/abort has effect"? y/n :
n

enable "ignore system config info"? y/n :
y

change console baud rate? y/n :
n

change the boot characteristics? y/n :
n

Configuration Summary :

=> load ROM after netboot fails

=> ignore system config info

=> console baud: 9600

=> autoboot from: commands specified in 'BOOT' environment variable

do you wish to save this configuration? y/n :
y

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

rommon 2 >
reset

Resetting .......

rommon 3 >

**********************************************************

* *

* Welcome to ROM Monitor for WS-X4014 System. *

* Copyright © 1999-2000, 2001 by Cisco Systems, Inc. *

* All rights reserved. *

* *

**********************************************************

ROM Monitor Program Version 12.1(10r)EY(1.21)

Board type 1, Board revision 7

Swamp FPGA revision 16, Dagobah FPGA revision 43

Timer interrupt test passed.

MAC Address : 00-02-b9-83-af-fe

IP Address : 172.16.84.122

Netmask : 255.255.255.0

Gateway : 172.16.84.1

TftpServer : Not set.

Main Memory : 256 Mbytes

***** The system will autoboot in 5 seconds *****

Type control-C to prevent autobooting.

. . . . .

******** The system will autoboot now ********

config-register = 0x2142

Autobooting using BOOT variable specified file.....

Current BOOT file is --- bootflash:

Rommon reg: 0x2B004180

Decompressing the image : ###########################

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

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

k2diags version 1.6

prod: WS-X4014 part: 73-6854-07 serial: JAB0546060Z

Power-on-self-test for Module 1: WS-X4014

Status: (. = Pass, F = Fail)

Traffic using serdes loopback (L2; one port at a time)...

switch port 0: . switch port 1: . switch port 2: .

switch port 3: . switch port 4: . switch port 5: .

switch port 6: . switch port 7: . switch port 8: .

!--- Output suppressed.

Module 1 Passed

Exiting to ios...

Rommon reg: 0x2B000180

Decompressing the image : ##########################

!--- Output suppressed.

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

Restricted Rights Legend

Use, duplication, or disclosure by the Government is

subject to restrictions as set forth in subparagraph

© of the Commercial Computer Software - Restricted

Rights clause at FAR sec. 52.227-19 and subparagraph

© (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 Catalyst 4000 L3 Switch Software (cat4000-IS-M),

Version 12.1(8a)EW, RELEASE SOFTWARE (fc1)

TAC Support:

Copyright © 1986-2002 by cisco Systems, Inc.

Compiled Thu 24-Jan-02 17:34 by ccai

Image text-base: 0x00000000, database: 0x00AA2B8C

cisco WS-C4006 (MPC8245) processor (revision 7) with 262144K bytes of memory.

Processor board ID FOX04183666

Last reset from Reload

32 Gigabit Ethernet/IEEE 802.3 interface(s)

467K bytes of nonvolatile configuration memory.

Press RETURN to get started!

00:00:21: %SYS-5-RESTART: System restarted --

Cisco Internetwork Operating System Software

IOS Catalyst 4000 L3 Switch Software (cat4000-IS-M),

Version 12.1(8a)EW, RELEASE SOFTWARE (fc1)

TAC Support:

Copyright © 1986-2002 by cisco Systems, Inc.

Compiled Thu 24-Jan-02 17:34 by ccai

00:00:21: %SNMP-5-COLDSTART: SNMP agent on host Switch is undergoing a cold start

Switch>
enable

Switch#
show version

Cisco Internetwork Operating System Software

IOS Catalyst 4000 L3 Switch Software (cat4000-IS-M),

Version 12.1(8a)EW, RELEASE SOFTWARE (fc1)

TAC Support:

Copyright © 1986-2002 by cisco Systems, Inc.

Compiled Thu 24-Jan-02 17:34 by ccai

Image text-base: 0x00000000, database: 0x00AA2B8C

ROM: 12.1(10r)EY(1.21)

Switch uptime is 5 minutes

System returned to ROM by reload

Running default software

cisco WS-C4006 (MPC8245) processor (revision 7) with 262144K bytes of memory.

Processor board ID FOX04183666

Last reset from Reload

32 Gigabit Ethernet/IEEE 802.3 interface(s)

467K bytes of nonvolatile configuration memory.

Configuration register is 0x2142

Switch#

Switch#
configure memory

Uncompressed configuration from 1307 bytes to 3014 bytes

c-4006-SUPIII#

00:13:52: %SYS-5-CONFIG_I: Configured from memory by console

c-4006-SUPIII#
show running-config

Building configuration...

Current configuration : 3014 bytes

!

version 12.1

no service pad

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

service compress-config

!

hostname c-4006-SUPIII

!

boot system flash bootflash:

!

vtp mode transparent

!

vlan 20

private-vlan primary

!

vlan 100

!

vlan 202

private-vlan association 440

!

vlan 440

private-vlan isolated

!

vlan 500

ip subnet-zero

no ip domain-lookup

!

ip multicast-routing

!

!

interface GigabitEthernet1/1

no switchport

ip address 10.1.1.1 255.255.255.0

ip pim dense-mode

!

interface GigabitEthernet1/2

no switchport

ip address 20.1.1.1 255.255.255.0

!

!--- Output suppressed.

!

interface Vlan1

ip address 172.16.84.140 255.255.255.0

ip pim dense-mode

!

interface Vlan2

no ip address

shutdown

!

interface Vlan20

no ip address

shutdown

!

!--- Output suppressed.

!

line con 0

stopbits 1

line vty 0 4

login

!

end

c-4006-SUPIII#
configure terminal

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

c-4006-SUPIII(config)#
no enable secret

!--- This step is necessary if the switch had

!--- an enable secret password.

c-4006-SUPIII(config)#
enable secret < password >

c-4006-SUPIII(config)#
config-register 0x2102

c-4006-SUPIII(config)#
^Z

c-4006-SUPIII#

00:19:01: %SYS-5-CONFIG_I: Configured from console by console

c-4006-SUPIII#
write memory

Building configuration...

Compressed configuration from 3061 bytes to 1365 bytes

c-4006-SUPIII#
show version

Cisco Internetwork Operating System Software

IOS Catalyst 4000 L3 Switch Software (cat4000-IS-M),

Version 12.1(8a)EW, RELEASE SOFTWARE (fc1)

TAC Support:

Copyright © 1986-2002 by cisco Systems, Inc.

Compiled Thu 24-Jan-02 17:34 by ccai

Image text-base: 0x00000000, database: 0x00AA2B8C

ROM: 12.1(10r)EY(1.21)

c-4006-SUPIII uptime is 20 minutes

System returned to ROM by reload

Running default software

cisco WS-C4006 (MPC8245) processor (revision 7) with 262144K bytes of memory.

Processor board ID FOX04183666

Last reset from Reload

32 Gigabit Ethernet/IEEE 802.3 interface(s)

467K bytes of nonvolatile configuration memory.

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

c-4006-SUPIII#

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