You are on page 1of 11

Password Recovery Procedure for the Catalyst 4500/4000 Supervisor Engine II+/II+TS/II+10GE/III/IV/V/V 10GE Module and

Catalyst 4900 Switches that Run Cisco IOS Software
Document ID: 21229

Contents
Introduction Prerequisites Requirements Conventions Step−by−Step Procedure Sample Output/Example Procedure Related Information

Introduction
This document describes how to recover a lost or unknown password on a Catalyst 4500/4000 switch with a Supervisor Engine II−Plus (WS−X4013+), Supervisor Engine II−Plus−TS (WS−X4013+TS), Supervisor Engine II−Plus−10GE (WS−X4013+10GE), Supervisor Engine III (WS−X4014), Supervisor Engine IV (WS−X4515), Supervisor Engine V (WS−X4516), Supervisor Engine V−10GE (WS−X4516−10GE) module, Cisco Catalyst 4948, Cisco Catalyst 4948 10GE, and Cisco Catalyst 4900M switches. Note: In Catalyst 4500/4000 Series Switches, Supervisor Engines II+, II+10GE, II+TS, III, IV, V, and V−10GE support only Cisco IOS® Software and Supervisor Engines I and II support only the Catalyst OS Software. In order to recover the password on the Supervisor Engines I or II, refer to Password Recovery Procedure for the Catalyst 1200, 1400, 2901, 2902, 2926T/F, 2926GS/L, 2948G, 2980G, 4000, 5000, 5500, 6000, 6500 Running CatOS.

Prerequisites
Requirements
There are no specific requirements for this document.

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

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 (c) 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 IP Address Netmask Gateway TftpServer Main Memory : : : : : : 00−02−b9−83−af−fe 172.16.84.122 255.255.255.0 172.16.84.1 Not set. 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 [n]: y enable "diagnostic mode"? y/n [n]: n enable "use net in IP bcast address"? y/n [n]: n disable "load ROM after netboot fails"? y/n [n]: n enable "use all zero broadcast"? y/n [n]: n enable "break/abort has effect"? y/n [n]: n enable "ignore system config info"? y/n [n]: y change console baud rate? y/n [n]: n [n]: n

change the boot characteristics? y/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 [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 (c) 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 (tm) Catalyst 4000 L3 Switch Software (cat4000−IS−M), Version 12.1(8a)EW, RELEASE SOFTWARE (fc1) TAC Support: http://www.cisco.com/tac Copyright (c) 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 (TM) Catalyst 4000 L3 Switch Software (cat4000−IS−M), Version 12.1(8a)EW, RELEASE SOFTWARE (fc1) TAC Support: http://www.cisco.com/tac Copyright (c) 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. c−4006−SUPIII(config)#no enable secret End with CNTL/Z.

!−−− This step is necessary if the switch had an enable !−−− secret password.

c−4006−SUPIII(config)#enable secret < password > [Choose a strong password with at least one capital letter, one number, and one special character.] !−−− 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[OK] c−4006−SUPIII#show version !−−− This step verifies the value change. Cisco Internetwork Operating System Software IOS (TM) Catalyst 4000 L3 Switch Software (cat4000−IS−M), Version 12.1(8a)EW, RELEASE SOFTWARE (fc1) TAC Support: http://www.cisco.com/tac Copyright (c) 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 (c) 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 IP Address Netmask Gateway TftpServer Main Memory : : : : : : 00−02−b9−83−af−fe 172.16.84.122 255.255.255.0 172.16.84.1 Not set. 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 [n]: y enable "diagnostic mode"? y/n [n]: n enable "use net in IP bcast address"? y/n [n]: n disable "load ROM after netboot fails"? y/n [n]: n enable "use all zero broadcast"? y/n [n]: n enable "break/abort has effect"? y/n [n]: n enable "ignore system config info"? y/n [n]: y change console baud rate? y/n [n]: 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 [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 (c) 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 IP Address Netmask Gateway TftpServer Main Memory : : : : : : 00−02−b9−83−af−fe 172.16.84.122 255.255.255.0 172.16.84.1 Not set. 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 : ########################### ##################################################### ####################################### [OK] k2diags version 1.6 prod: WS−X4014 part: 73−6854−07 serial: JAB0546060Z WS−X4014

Power−on−self−test for Module 1: 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. ######################################################### [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 (TM) Catalyst 4000 L3 Switch Software (cat4000−IS−M), Version 12.1(8a)EW, RELEASE SOFTWARE (fc1) TAC Support: http://www.cisco.com/tac Copyright (c) 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 (TM) Catalyst 4000 L3 Switch Software (cat4000−IS−M), Version 12.1(8a)EW, RELEASE SOFTWARE (fc1) TAC Support: http://www.cisco.com/tac Copyright (c) 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 (TM) Catalyst 4000 L3 Switch Software (cat4000−IS−M), Version 12.1(8a)EW, RELEASE SOFTWARE (fc1) TAC Support: http://www.cisco.com/tac Copyright (c) 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. 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 > [Choose a strong password with at least one capital letter, one number, and one special character.] 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[OK] c−4006−SUPIII#show version Cisco Internetwork Operating System Software IOS (TM) Catalyst 4000 L3 Switch Software (cat4000−IS−M), Version 12.1(8a)EW, RELEASE SOFTWARE (fc1) TAC Support: http://www.cisco.com/tac Copyright (c) 1986−2002 by cisco Systems, Inc. Compiled Thu 24−Jan−02 17:34 by ccai

End with CNTL/Z.

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#

Related Information
• Standard Break Key Sequence Combinations During Password Recovery • Password Recovery Procedures • LAN Product Support Pages • LAN Switching Support Page • Technical Support & Documentation − Cisco Systems

Contacts & Feedback | Help | Site Map © 2010 − 2011 Cisco Systems, Inc. All rights reserved. Terms & Conditions | Privacy Statement | Cookie Policy | Trademarks of Cisco Systems, Inc.

Updated: Aug 26, 2008

Document ID: 21229