Cisco路由器配置信息及口令的清除.docx
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Cisco路由器配置信息及口令的清除
Cisco路由器配置信息及口令的清除
在网络日常管理与维护的工作中,你是否遇到过这种现象:
由于忘记了口令,你被原来亲切的“朋友”——路由器或交换机强行拒于门外,无法进行参数的重新设置、信息统计。
下面就针对几种常见而重要的网络设备的口令清除方法谈谈本人的一点“小窍门”。
适用范围:
所有IOS在10.0及以上版本的Cisc
清除步骤如下:
1.用路由器所带的串口线连接到Console口,以下通过Win95的超级终端进行;
2.路由器加电后60秒内,按下CTRL(如果不行按CTRL-BREAK)键,等待出现“〉”提示符;3.键入“〉e/s2000002”命令,并记录下返回值,用在后面“Router(config)#config-register0x2102”命令中;(通常返回值是2102)
4.在“〉”符号后键入“o/r0x42”;
5.键入“i”,路由器将重新初始化,对于出现的提示问题,回答No;
6.键入“Enable”(没有口令,按回车即可);
7.改变口令(无论是否加密):
a.输入“configmem”或“copystartup-configmem”;
b.输入“write”;
c.输入“configterm”并输入“enablesecret〈password〉”和“enablepassword〈password〉”,改变口令;
8.去掉用户提示及口令:
a.进入虚拟行配置模式,输入“linevty04”;
b.输入“password〈password〉”,改变口令;
c.输入“login”(可以去掉用户提示,原来是loginlocal);
9.完成后按Ctrl-z结束;
10.输入“write”保存所做的改变;
11.进入特权配置模式,键入“config-register0x2102”(注意,必须完成此步);
12.Write保存配置信息;
13.退出配置模式,Reload完成重新启动路由器即可。
说明:
o/r0x42是从Flash中引导路由器,如果不成功,可采用o/r0x41从ROM中引导路由器,其余操作与o/r0x42相同,但是最好只在Flash引导不成功或Flash内容被删除、没有Flash情况下才用。
使用0x41只能查看或删除配置信息而不能更改口令。
o2000、2500、3000、4000、7000系列路由器。
ExampleofPasswordRecoveryonaCisco2600
ThefollowingexampleshowspasswordrecoveryonaCisco2600.Router>en
Password:
Password:
Password:
%Badsecrets
Router>shver
CiscoInternetworkOperatingSystemSoftware
IOS(tm)C2600Software(C2600-IS-M),Version12.0(7)T,RELEASESOFTWARE(fc2)
Copyright(c)1986-1999byciscoSystems,Inc.
CompiledTue07-Dec-9902:
21byphanguye
Imagetext-base:
0x80008088,data-base:
0x80C524F8
ROM:
SystemBootstrap,Version11.3
(2)XA4,RELEASESOFTWARE(fc1)Routeruptimeis3minutes
SystemreturnedtoROMbyabortatPC0x802D0B60
Systemimagefileis"flash:
c2600-is-mz.120-7.T"
cisco2611(MPC860)processor(revision0x202)with26624K/6144Kbytesofmemory.
ProcessorboardIDJAB031202NK(3878188963)
M860processor:
partnumber0,mask49
Bridgingsoftware.
X.25software,Version3.0.0.
BasicRateISDNsoftware,Version1.1.
2Ethernet/IEEE802.3interface(s)
2Serial(sync/async)networkinterface(s)
1ISDNBasicRateinterface(s)
32Kbytesofnon-volatileconfigurationmemory.
--More--8192KbytesofprocessorboardSystemflashpartition1(Read/Write)
8192KbytesofprocessorboardSystemflashpartition2(Read/Write)
Configurationregisteris0x2102
Router>
!
---Therouterwasjustpowercycledandduringbootupa!
---breaksequencewassenttotherouter.
!
***SystemreceivedanabortduetoBreakKey***
signal=0x3,code=0x500,context=0x813ac158
PC=0x802d0b60,Vector=0x500,SP=0x80006030
rommon1>confreg0x2142
Youmustresetorpowercyclefornewconfigtotakeeffectrommon2>reset
SystemBootstrap,Version11.3
(2)XA4,RELEASESOFTWARE(fc1)Copyright(c)1999byciscoSystems,Inc.
TAC:
Home:
SW:
IOS:
Specialsforinfo
C2600platformwith32768Kbytesofmainmemory
programloadcomplete,entrypoint:
0x80008000,size:
0x6fdb4cSelfdecompressingtheimage:
#############################################################################################
##############################################################
##############################################################
###############################[OK]
RestrictedRightsLegend
Use,duplication,ordisclosurebytheGovernmentis
subjecttorestrictionsassetforthinsubparagraph
(c)oftheCommercialComputerSoftware-Restricted
RightsclauseatFARsec.52.227-19andsubparagraph
(c)
(1)(ii)oftheRightsinTechnicalDataandComputerSoftwareclauseatDFARSsec.252.227-7013.
ciscoSystems,Inc.
170WestTasmanDrive
SanJose,California95134-1706
CiscoInternetworkOperatingSystemSoftware
IOS(tm)C2600Software(C2600-IS-M),Version12.0(7)T,RELEASESOFTWARE(fc2)
Copyright(c)1986-1999byciscoSystems,Inc.
CompiledTue07-Dec-9902:
21byphanguye
Imagetext-base:
0x80008088,data-base:
0x80C524F8
cisco2611(MPC860)processor(revision0x202)with26624K/6144Kbytesofmemory.
ProcessorboardIDJAB031202NK(3878188963)
M860processor:
partnumber0,mask49
Bridgingsoftware.
X.25software,Version3.0.0.
BasicRateISDNsoftware,Version1.1.
2Ethernet/IEEE802.3interface(s)
2Serial(sync/async)networkinterface(s)
1ISDNBasicRateinterface(s)
32Kbytesofnon-volatileconfigurationmemory.
8192KbytesofprocessorboardSystemflashpartition1(Read/Write)
8192KbytesofprocessorboardSystemflashpartition2(Read/Write)
---SystemConfigurationDialog---
Wouldyouliketoentertheinitialconfigurationdialog?
[yes/no]:
n
PressRETURNtogetstarted!
00:
00:
19:
%LINK-3-UPDOWN:
InterfaceBRI0/0,changedstatetoup00:
00:
19:
%LINK-3-UPDOWN:
InterfaceEthernet0/0,changedstatetoup
00:
00:
19:
%LINK-3-UPDOWN:
InterfaceEthernet0/1,changedstatetoup
00:
00:
19:
%LINK-3-UPDOWN:
InterfaceSerial0/0,changedstatetodown
00:
00:
19:
%LINK-3-UPDOWN:
InterfaceSerial0/1,changedstatetodown
00:
00:
20:
%LINEPROTO-5-UPDOWN:
LineprotocolonInterfaceBRI0/0,changedstatetodown
00:
00:
20:
%LINEPROTO-5-UPDOWN:
LineprotocolonInterfaceEthernet0/0,changedstatetoup
Router>
00:
00:
20:
%LINEPROTO-5-UPDOWN:
LineprotocolonInterfaceEthernet0/1,changedstatetoup
00:
00:
20:
%LINEPROTO-5-UPDOWN:
LineprotocolonInterfaceSerial0/0,changedstatetodown
00:
00:
20:
%LINEPROTO-5-UPDOWN:
LineprotocolonInterfaceSerial0/1,changedstatetodown
00:
00:
50:
%SYS-5-RESTART:
Systemrestarted--
CiscoInternetworkOperatingSystemSoftware
IOS(tm)C2600Software(C2600-IS-M),Version12.0(7)T,RELEASESOFTWARE(fc2)
Copyright(c)1986-1999byciscoSystems,Inc.
CompiledTue07-Dec-9902:
21byphanguye
00:
00:
50:
%LINK-5-CHANGED:
InterfaceBRI0/0,changedstatetoadministrativelydown
00:
00:
52:
%LINK-5-CHANGED:
InterfaceEthernet0/0,changedstatetoadministrativelydown
00:
00:
52:
%LINK-5-CHANGED:
InterfaceSerial0/0,changedstatetoadministrativelydown
00:
00:
52:
%LINK-5-CHANGED:
InterfaceEthernet0/1,changedstatetoadministrativelydown
00:
00:
52:
%LINK-5-CHANGED:
InterfaceSerial0/1,changedstatetoadministrativelydown
00:
00:
53:
%LINEPROTO-5-UPDOWN:
LineprotocolonInterfaceEthernet0/0,changedstatetodown
00:
00:
53:
%LINEPROTO-5-UPDOWN:
LineprotocolonInterfaceEthernet0/1,changedstatetodown
Router>
Router>en
Router#copystartrun
Destinationfilename[running-config]?
1324bytescopiedin2.35secs(662bytes/sec)
Router#
00:
01:
24:
%LINEPROTO-5-UPDOWN:
LineprotocolonInterfaceBRI0/0:
1,changedstatetodown
00:
01:
24:
%LINEPROTO-5-UPDOWN:
LineprotocolonInterfaceBRI0/0:
2,changedstatetodown
Router#conft
Enterconfigurationcommands,oneperline.EndwithCNTL/Z.Router(config)#enablesecretcisco
Router(config)#^Z
00:
01:
54:
%SYS-5-CONFIG_I:
ConfiguredfromconsolebyconsoleRouter#shipintbrief
InterfaceIP-AddressOK?
MethodStatusProtocol
Ethernet0/010.200.40.37YESTFTPadministrativelydowndown
Serial0/0unassignedYESTFTPadministrativelydowndown
BRI0/0193.251.121.157YESunsetadministrativelydowndown
BRI0/0:
1unassignedYESunsetadministrativelydowndown
BRI0/0:
2unassignedYESunsetadministrativelydowndown
Ethernet0/1unassignedYESTFTPadministrativelydowndown
Serial0/1unassignedYESTFTPadministrativelydowndown
Loopback0193.251.121.157YESTFTPupup
Router#conft
Enterconfigurationcommands,oneperline.EndwithCNTL/Z.Router(config)#intEthernet0/0
Router(config-if)#noshut
Router(config-if)#
00:
02:
14:
%LINK-3-UPDOWN:
InterfaceEthernet0/0,changedstatetoup
00:
02:
15:
%LINEPROTO-5-UPDOWN:
LineprotocolonInterfaceEthernet0/0,changedstatetoup
Router(config-if)#intBRI0/0
Router(config-if)#noshut
Router(config-if)#
00:
02:
26:
%LINK-3-UPDOWN:
InterfaceBRI0/0:
1,changedstatetodown
00:
02:
26:
%LINK-3-UPDOWN:
InterfaceBRI0/0:
2,changedstatetodown
00:
02:
26:
%LINK-3-UPDOWN:
InterfaceBRI0/0,changedstatetoup00:
02:
115964116991:
%ISDN-6-LAYER2UP:
Layer2forInterfaceBR0/0,TEI68changedtoup
Router(config-if)#^Z
Router#
00:
02:
35:
%SYS-5-CONFIG_I:
ConfiguredfromconsolebyconsoleRouter#copyrunstart
Destinationfilename[startup-config]?
Buildingconfiguration...
[OK]
Router#shver
CiscoInternetworkOperatingSystemSoftware
IOS(tm)C2600Software(C2600-IS-M),Version12.0(7)T,RELEASESOFTWARE(fc2)
Copyright(c)1986-1999byciscoSystems,Inc.
CompiledTue07-Dec-9902:
21byphanguye
Imagetext-base:
0x80008088,data-base:
0x80C524F8
ROM:
SystemBootstrap,Version11.3
(2)XA4,RELEASESOFTWARE(fc1)Routeruptimeis3minutes
SystemreturnedtoROMbyabortatPC0x802D0B60
Systemimagefileis"flash:
c2600-is-mz.120-7.T"
cisco2611(MPC860)processor(revision0x202)with26624K/6144Kbytesofmemory.
ProcessorboardIDJAB031202NK(3878188963)
M860processor:
partnumber0,mask49
Bridgingsoftware.
X.25software,Version3.0.0.
BasicRateISDNsoftware,Version1.1.
2Ethernet/IEEE802.3interface(s)
2Serial(sync/async)networkinterface(s)
1ISDNBasicRateinterface(s)
32Kbytesofnon-volatileconfigurationmemory.
--More--8192KbytesofprocessorboardSystemflashpartition1(Read/Write)
8192KbytesofprocessorboardSystemflashpartition2(Read/Write)
Configurationregisteris0x2142
Router#conft
Enterconfigurationcommands,oneperline.EndwithCNTL/Z.Router(config)#config-reg0x2102
Router(config)#^Z
00:
03:
20:
%SYS-5-CONFIG_I:
ConfiguredfromconsolebyconsoleRouter#shver
CiscoInternetworkOperatingSystemSoftware
IOS(tm)C2600Software(C2600-IS-M),Version12.0(7)T,RELEASESOFTWARE(fc2)
Copyright(c)1986-1999byciscoSystems,Inc.
CompiledTue07-Dec-9902:
21byphanguye
Imagetext-base:
0x80008088,data-base:
0x80C524F8
ROM:
SystemBootstrap,Version11.3
(2)XA4,RELEASESOFTWARE(fc1)Routeruptimeis3minutes
SystemreturnedtoROMbyabortatPC0x802D0B60
Systemimagefileis"flash:
c2600-is-mz.120-7.T"
cisco2611(MPC860)processor(revision0x202)with26624K/6144Kbytesofmemory.
ProcessorboardIDJAB031202NK(3878188963)
M860processor:
partnumber0,mask49
Bridgingsoftware.