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2007-03-11 10:00:52
This document describes the password recovery procedure for the following Cisco products:
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9600 baud rate
No parity
8 data bits
1 stop bit
No flow control
The required console cable specifications are described in the Cabling Guide for RJ-45 Console and AUX Ports (Cisco's 1000 series, 2500 series, and AS5100).
The configuration register setting is usually 0x2102 or 0x102.
If the break sequence doesn't work, see Possible Key Combinations for Break Sequence During Password Recovery for other key combinations.
The router reboots but ignores its saved configuration.
You'll be in enable mode and see the Router# prompt.
The show running and wr term commands show the configuration of the router. In this configuration you see under all the interfaces the shutdown command, which means all interfaces are currently shutdown. Also, you can see the passwords either in encrypted or unencrypted format.
The prompt is now hostname(config)#.
The prompt is now hostname#.
The following example shows password recovery on a Cisco 2600.
Router>en Password: Password: Password: % Bad secrets Cisco Internetwork Operating System Software IOS (tm) 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. --More-- 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 0x2102Router>
!--- 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 (tm) 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 (tm) 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>en Router#copy start run 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#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#enable secret cisco Router(config)#^Z 00:01:54: %SYS-5-CONFIG_I: Configured from console by console Router#sh ip int 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#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#int Ethernet0/0 Router(config-if)#no shut 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)#int BRI0/0 Router(config-if)#no shut 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 run start Destination filename [startup-config]? Building configuration... [OK] Router#sh ver Cisco Internetwork Operating System Software IOS (tm) 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. --More-- 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#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#config-reg 0x2102 Router(config)#^Z 00:03:20: %SYS-5-CONFIG_I: Configured from console by console Router#sh ver Cisco Internetwork Operating System Software IOS (tm) 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. --More-- 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#
