路由器的密码恢复
路由器的密码恢复
:
原理：启动时绕过
startup-config
的配置
(enable
密码保存在
startup-config
中
)
，然后重新配置
enable
密码。
如果要使路由器在启动时绕过
startup-config
的配置，只有修改配置寄存器的值。正常情况下配置寄存器的值是
0x2102==0010.0001.0
0
00.0010
，其中第三段的第
2
个比特位可以控制路由器的启动顺序。如果该位为
0
，则启动时候运行
startup-config
的配置，如果该位为
1
则忽略
startup-config
的配置，而进入
setup
模式。
从通信服务器上进入某一路由器（以二楼第一机房
6
号路由器
C2600
为例）
routerserver#r6
Trying r6 ( 10.0.0 .1, 2006)... Open
关闭路由器电源再打开，然后按下
CTRL
键，不停地按
Break
键，直到出现
rommon1>
为止，使路由器进入
ROM Moniror
模式。
System Bootstrap, Version 12.2(7r) [cmong 7r], RELEASE SOFTWARE (fc1)
Copyright (c) 2002 by cisco Systems, Inc.
C2600 platform with 131072 Kbytes of main memory
monitor: command "boot" aborted due to user interrupt
rommon 1 >
rommon 1 >
rommon 1 > confreg 0x2142
改变寄存器的值，让路由器忽略
startup-config
的配置，而进入
Setup
模式
You must reset or power cycle for new config to take effect
rommon 2 > reset
重新启动路由器
System Bootstrap, Version 12.2(7r) [cmong 7r], RELEASE SOFTWARE (fc1)
Copyright (c) 2002 by cisco Systems, Inc.
C2600 platform with 131072 Kbytes of main memory
program load complete, entry point: 0x80008000, size: 0xe 688c 8
Self decompressing the image : #################################################
################################################################################
################################################################################
########################## [OK]
Smart Init is enabled
smart init is sizing iomem
ID MEMORY_REQ TYPE
00036B 0X 00103980 C 2611XM Dual Fast Ethernet
0X 000F 3BB0 public buffer pools
0X00211000 public particle pools
TOTAL: 0X00408530
If any of the above Memory Requirements are
"UNKNOWN", you may be using an unsupported
configuration or there is a software problem and
system operation may be compromised.
Rounded IOMEM up to: 5Mb.
Using 3 percent iomem. [5Mb/128Mb]
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-IK8O3S-M), Version 12.2(11)T, RELEASE SOFTWARE (
fc1)
TAC Support: [url]http://www.cisco.com/tac[/url]
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Thu 01-Aug-02 12:47 by ccai
Image text-base: 0x 8000809C , data-base: 0x 818188F 4
Compliance with U.S. Export Laws and Regulations - Encryption
This product performs encryption and is regulated for export
by the U.S. Government.
This product is not authorized for use by persons located
outside the United States and Canada that do not have prior
approval from Cisco Systems, Inc. or the U.S. Government.
This product may not be exported outside the U.S. and Canada
either by physical or electronic means without PRIOR approval
of Cisco Systems, Inc. or the U.S. Government.
Persons outside the U.S. and Canada may not re-export, resell,
or transfer this product by either physical or electronic means
without prior approval of Cisco Systems, Inc. or the U.S.
Government.
cisco 2611XM (MPC860P) processor (revision 0x100) with 125952K/5120K bytes of me
mory.
Processor board ID JAD07020UQK (3078295415)
M860 processor: part number 5, mask 2
Bridging software.
X.25 software, Version 3.0.0 .
2 FastEthernet/IEEE 802.3 interface(s)
32K bytes of non-volatile configuration memory.
32768K bytes of processor board System flash (Read/Write)
--- System Configuration Dialog ---
Would you like to enter the initial configuration dialog? [yes/no]: no
不进入对话模式
退回到
EXEC
模式
Press RETURN to get started!
*Mar 1 00:00:14.046: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state t
o up
*Mar 1 00:00:14.046: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state t
o up
*Mar 1 00:00:15.048: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthern
et0/0, changed state to down
*Mar 1 00:00:15.048: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthern
et0/1, changed state to down
*Mar 1 00:00:20.613: %LINK-5-CHANGED: Interface FastEthernet0/0, changed state
to administratively down
*Mar 1 00:00:20.613: %LINK-5-CHANGED: Interface FastEthernet0/1, changed state
to administratively down
*Mar 1 00:00:22.384: %SYS-5-RESTART: System restarted --
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IK8O3S-M), Version 12.2(11)T, RELEASE SOFTWARE (
fc1)
TAC Support: [url]http://www.cisco.com/tac[/url]
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Thu 01-Aug-02 12:47 by ccai
*Mar 1 00:00:22.384: %SNMP-5-COLDSTART: SNMP agent on host Router is undergoing
a cold start
Router>
Router>enable
进入特权模式
Router#copy startup-config running-config
使路由器以前的配置生效，保证以前的配置不丢失。
Destination filename [running-config]?
702 bytes copied in 2.488 secs (282 bytes/sec)
Router#config terminal
进入全局模式
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#no enable password
删除使能密码
Router(config)#no enable secret
删除加密的使能密码
Router(config)#config-register 0x2102
把配置寄存器的值改回来，否则以后每次重新启动路由器都进入
setup
模式
Router#copy running-config startup-config
保存当前配置
Destination filename [startup-config]?
Building configuration...
[OK]
Router#reload
重新启动
Proceed with reload? [confirm]
*Mar 1 00:06:14.950: %SYS-5-RELOAD: Reload requested by console.
System Bootstrap, Version 12.2(7r) [cmong 7r], RELEASE SOFTWARE (fc1)
Copyright (c) 2002 by cisco Systems, Inc.
C2600 platform with 131072 Kbytes of main memory
program load complete, entry point: 0x80008000, size: 0xe 688c 8
Self decompressing the image : #################################################
################################################################################
################################################################################
########################## [OK]
Smart Init is enabled
smart init is sizing iomem
ID MEMORY_REQ TYPE
00036B 0X 00103980 C 2611XM Dual Fast Ethernet
0X 000F 3BB0 public buffer pools
0X00211000 public particle pools
TOTAL: 0X00408530
If any of the above Memory Requirements are
"UNKNOWN", you may be using an unsupported
configuration or there is a software problem and
system operation may be compromised.
Rounded IOMEM up to: 5Mb.
Using 3 percent iomem. [5Mb/128Mb]
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-IK8O3S-M), Version 12.2(11)T, RELEASE SOFTWARE (
fc1)
TAC Support: [url]http://www.cisco.com/tac[/url]
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Thu 01-Aug-02 12:47 by ccai
Image text-base: 0x 8000809C , data-base: 0x 818188F 4
Compliance with U.S. Export Laws and Regulations - Encryption
This product performs encryption and is regulated for export
by the U.S. Government.
This product is not authorized for use by persons located
outside the United States and Canada that do not have prior
approval from Cisco Systems, Inc. or the U.S. Government.
This product may not be exported outside the U.S. and Canada
either by physical or electronic means without PRIOR approval
of Cisco Systems, Inc. or the U.S. Government.
Persons outside the U.S. and Canada may not re-export, resell,
or transfer this product by either physical or electronic means
without prior approval of Cisco Systems, Inc. or the U.S.
Government.
cisco 2611XM (MPC860P) processor (revision 0x100) with 125952K/5120K bytes of me
mory.
Processor board ID JAD07020UQK (3078295415)
M860 processor: part number 5, mask 2
Bridging software.
X.25 software, Version 3.0.0 .
2 FastEthernet/IEEE 802.3 interface(s)
32K bytes of non-volatile configuration memory.
32768K bytes of processor board System flash (Read/Write)
Press RETURN to get started!
*Mar 1 00:00:13.942: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state t
o up
*Mar 1 00:00:13.942: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state t
o up
*Mar 1 00:00:15.132: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthern
et0/0, changed state to down
*Mar 1 00:00:15.132: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthern
et0/1, changed state to down
*Mar 1 00:00:16.610: %SYS-5-CONFIG_I: Configured from memory by console
*Mar 1 00:00:17.924: %LINK-5-CHANGED: Interface FastEthernet0/0, changed state
to administratively down
*Mar 1 00:00:17.928: %LINK-5-CHANGED: Interface FastEthernet0/1, changed state
to administratively down
*Mar 1 00:00:20.424: %SYS-5-RESTART: System restarted --
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IK8O3S-M), Version 12.2(11)T, RELEASE SOFTWARE (
fc1)
TAC Support: [url]http://www.cisco.com/tac[/url]
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Thu 01-Aug-02 12:47 by ccai
*M
User Access ar 1 00:00:20.424: %SNMP-5-COLDSTART: SNMP agent on host Router is
undergoing a cold startVerification
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