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
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:
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
1.
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.
2.
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.
¨
3.
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.
4.
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.
5.
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.
Type enable at the Router> prompt.
You are in enable mode and should see the Router# prompt.
8.
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.
9.
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.
10.
Type configure terminal.
The hostname(config)# prompt appears.
11.
Type enable secret <password> in
order to change the enable secret password. For example:
hostname(config)#enable
secret cisco
12.
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.
13.
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
14.
Press Ctrl−z or end in order to leave
the configuration mode.
The hostname# prompt
appears.
15.
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 should 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 < 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 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
· Password
Recovery Procedures
· 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
· Routers
Product Support
· Technical
Support & Documentation − Cisco Systems
Contacts & Feedback | Help |
Site Map
© 2012 − 2013 Cisco Systems, Inc.
All rights reserved. Terms & Conditions | Privacy Statement | Cookie Policy
| Trademarks of
Cisco Systems, Inc.
Updated:
Jul 08, 2010 Document ID: 112058
Courtesy
by Cisco
good info!
ReplyDelete