云南龙网

  1. 首页 > 云知道 > >

IOS软件中路由器的口令设置和口令恢复( 二 )

云知道


路由器的ROM中除固化了一种功能有限的IOS之外 ， 还有一种非IOS的简单操作系统 ， 同IOS一样 ， 也可以被加载 ， 加载之后进入的模式被称为ROM Monitor模式 。ROM Mintor模式通常被用于对设备进行低级调试和口令恢复 。在网络设备的一般性调试中很少用到ROMMonitor模式 。这是许多人对它不熟悉的主要原因 。
以PC机的超级终端访问路由器 ， 在路由器加电后的60s内按下Break键 (或Ctrl Break键)就能进入到ROM Monitor模式下 ， 口令恢复的操作便可以进行了 。
监测清单2-5记录了对Cisco2500系列路由器口令恢复操作的全过程 ， 其中与口令恢复操作无关的内容己被删节 。
监测清单2-5 Cisco 2500系列路由器的口令恢复操作
第1段: ROM Monitor
System Bootstrap, Version 5.2(8a), RELEASE SOFTWARE
Copyright (c) 1986-1995 by cisco Systems
2500 processor with 16384 Kbytes of main memory
(按下Break键, 进入ROM Monitor模式)
Abort at Ox1OEA81C (PC)
>?
$ Toggle cache state
B [filename] [TFTP Server IP address I TFTP Server Name]
Load and execute system image from ROM or from TFTP server
C [address] Continue execution [optional address]
D/S M LV Deposit value V of size S into location L with modifier M
E/S M L Examine location L with size S with modifier M
G [address] Begin execution
H Help for commands
I Initialize
K Stack trace
L [filename] [TFTP Server IP address ! TFTP Server Name]
Load system image from ROM or from TFTP server, but do not
begin execution
O Show configuration register option settings
P Set the break point
S Single step next instrUCtion
T function Test device (? for help)
Deposit and Examine sizes may be B (byte), L (long) or S (short).
Modifiers may be R (register) or S (byte swap).
Register names are: DO-D7, AO-A6, SS, US, SR, and PC
>0
Configuration register=0xFFFF2102atlast boot
Bit# Configuration register option settings:
15 Diagnostic mode disabled
14 IP broadcasts do not have network numbers
13 Boot default ROM software if network boot fails
12-11 Console speed is 9600 baud
10 IP broadcasts with ones
08 Break disabled
07 OEM disabled
06 Ignore configuration disabled
03-OOBoot file is cisco2-2500 (or "boot system" command)
>o/r 0x2142
>i
第2段:路由器正常启动
(以下为路由器的正常启动过程)
System Bootstrap, Version 5.2(8a), RELEASE SOFTWARE
Copyright (c) 1986-1995 by cisco Systems
...(路由器启动报告,省略)
---System Configuration Dialog ---
Would you like to enter the initial configuration dialog? [yes/no]: n
Press RETURN to get started!
Router>en
Router#sh version
Cisco Internetwork Operating System Softwaree 0
... (此处为版本,接口等信息,省略)
Router#sh startup-config
Using 455 out of 32762 bytes
version 12.1
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Router
enable password cisco
... (此处省略多行)
!
line con 0
password ciscol
login
line aux 0
line vty 0 4
!
end
Router#copy start run
Destination filename [running-config]?
455 bytes copied in 4.708 sees (113 bytes/sec)
Router#conf t
Router(coiifig)#coiifig-register 0x2102
Router(config)#end
Router#sh version
Cisco Internetwork Operating System Softwaree 0
...(此处为版本、接口等信息 ， 省略)
Configuration register is 0x2142(will be 0x2102 at next reload)
(1)进入路由器ROM Monitor模式后 。用问号可以查看其所有命令 。其中"o"命令的执行结果显示当前配置寄存器值为0xFFFF2l02 。

推荐阅读


上一篇：羊腿怎么做

下一篇：咸鸡蛋腌多了吃不完怎样保存