CCIE实验室考试指南(6)[1]

【网络综合 - Cisco认证】
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
　　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/r0x214Cisco认证