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CCIE实验室考试指南(6)
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    Lab 06 -
  Password Recovery Trouble Shooting
  Let us assume that you have a router and you don’t know the enable
  secret password.
  First and foremost you must have physical access to the router to
  perform password recovery. Bit 6 defines if the configuration file will
  be loaded from NVRAM. Since there is a password in the configuration
  file that we do not know, we will want to set bit 6 to 1.
  If bit 6 is 0 then the router will load the configuration file from
  NVRAM. If bit 6 is 1 then the router will not load the configuration file
  from NVRAM.
  Configuration Register represented in Decimal

  此主题相关图片如下:

CCIE实验室考试指南(6)


  The following are the steps to recover from a lost password.
  1. Turn the router off, turn the router on, and within 60 seconds
issue the break sequence of your terminal emulation package. If
  you are using hyperterminal that would be .
  2. You will now be in ROM monitor mode indicated by the >
  prompt. Our goal here is to turn bit 6 on, so if the configuration
  register is set to 0x2102, we want to change the register to
  0x2142. To determine the current configuration register setting
  use the following command:
  >e/s 2000002
  To change the register:
  >o/r 0x2142
  To re-initialize the router
  >I
  3. After the router prompt appears get into the privileged mode
  and copy the backup configuration file to RAM.
  4. Get into the configuration mode and key in your new password
  5. Change the configuration register back to original setting
  6. Perform a no-shut on all interfaces
  7. Copy the running configuration to NVRAM
  All of the steps are in bold
  System Bootstrap, Version 5.2(8a),
  RELEASE SOFTWARE
  Copyright (c) 1986-1995 by CISCO Systems
  2500 processor with 16384 Kbytes
  of main memory
  Abort at 0x10EA87C (PC) break sequence
  issued here
  >e/s2000002
  2000002: 2102 use q to quit the examine mode
  >o/r0x2142
  >i
  System Bootstrap, Version 5.2(8a),
  RELEASE SOFTWARE
  Copyright (c) 1986-1995 by cisco Systems
  2500 processor with 16384 Kbytes
  of main memory
  F3: 7564496+94188+304272 at 0x3000060
  
  --- System Configuration Dialog --->
  At any point you may enter a question mark "?"
  for help.
  Use ctrl-c to abort configuration
  dialog at any prompt.
  Default settings are in square brackets "[ ]."
  Would you like to enter the initial
  configuration dialog? [yes]: n
  Press RETURN to get started!
  %LINK-3-UPDOWN: Interface Ethernet0,
  changed state to up
  %LINK-3-UPDOWN: Interface Ethernet1,
  changed state to up
  %LINK-3-UPDOWN: Interface Serial0,
  changed state to down
  %LINK-3-UPDOWN: Interface Serial1,
  changed state to down
  %LANCE-5-COLL: Unit 0, excessive



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