ASA 5510 清除密码

Step 1 Connect to the security appliance console port according to the “Accessing the Command-Line
Interface” section on page 2-1.
Step 2 Power off the security appliance, and then power it on.
Step 3 During the startup messages, press the Escape key when prompted to enter ROMMON.
Step 4 To set the security appliance to ignore the startup configuration at reload, enter the following command:
rommon #1> confreg
The security appliance displays the current configuration register value, and asks if you want to change
the value:
Current Configuration Register: 0x00000011
Configuration Summary:
boot TFTP image, boot default image from Flash on netboot failure
Do you wish to change this configuration? y/n [n]:
Step 5 Record your current configuration register value, so you can restore it later.
Step 6 At the prompt, enter Y to change the value.
The security appliance prompts you for new values.
Step 7 Accept the default values for all settings, except for the “disable system configuration?” value; at that
prompt, enter Y.
Step 8 Reload the security appliance by entering the following command:
rommon #2> boot
The security appliance loads a default configuration instead of the startup configuration.
Step 9 Enter privileged EXEC mode by entering the following command:
hostname> enable
Step 10 When prompted for the password, press Return.
The password is blank.
Step 11 Load the startup configuration by entering the following command:
hostname# copy startup-config running-config
Step 12 Enter global configuration mode by entering the following command:
hostname# configure terminal
Step 13 Change the passwords in the configuration by entering the following commands, as necessary:
hostname(config)# password password
hostname(config)# enable password password
hostname(config)# username name password password
Step 14 Change the configuration register to load the startup configuration at the next reload by entering the
following command:
hostname(config)# config-register value
Where value is the configuration register value you noted in Step 5. 0x1 is the default configuration
register. For more information about the configuration register, see the Cisco Security Appliance
Command Reference.
Step 15 Save the new passwords to the startup configuration by entering the following command:
hostname(config)# copy running-config startup-config

如果英文有够烂，就将就着看这里：

１、启动是按住“Escape”
２、出现rommon #1>时参照下面的输入：
　　rommon #1> confreg
３、会出现下面的文字发：
　　Current Configuration Register: 0x00000011
　　Configuration Summary:
　　boot TFTP image, boot default image from Flash on netboot failure
　　Do you wish to change this configuration? y/n [n]:
４、当然是回答“Y”了
５、输“boot”引导机器
    rommon #2> boot
6、机器绕开配置启动好后，进enable,用“copy startup-config running-config”把原来的配置运行起来，
　　再用下面的命令把密码改了，这次可以记牢了：
　　hostname(config)# password password
　　hostname(config)# enable password password
　　hostname(config)# username name password password、
７、改回register value，不然重启机器配置又没有了
　　hostname(config)# config-register 0x1
　　register value默认是0x1，愿菩萨保佑你当前的机器还没有改掉。