Cisco Basic Configuration

Cisco Basic Commands

1 switch#show running-config View the current running configuration

2 switch#show startup-config View saved configuration information

3 switch#cwrite save the current configuration information

4 switch#erase nvran delete saved configuration information

5 Command line card can be pressed ctrl+shift+6

6 reload reset

Configure console password

        Router>enable                                 进入特权模式

     Router#configure terminal                进入全局配置模式

     Router(config)#line console 0           进入控制台接口

     Router(config-line)#login                   登录

     Router(config-line)#password 1234   设置密码为1234

Set password to enter privileged mode

Router>enable

Router#configure terminal

Router(config)#enable password adc set clear text password (visible)

Router(config)#enable secret adc123 Set ciphertext password (invisible)

R1(config)#no enable password delete password

R1(config)#no enable secret

router password recovery

Principle: The router finds the operating system from the flash and loads it into the memory; then finds the router configuration from the nvram and loads it into the memory. If the second step is skipped and the router does not read nvram, then you can enter privileged mode without knowing the router password. After entering the privileged mode, load the nvram information, so that the router configuration can be loaded. Finally, change the router password

The default value of the router configuration register is 0x2102 (0x indicates that the following number is a hexadecimal number)

Operation process

When the router starts up (when the # sign appears on the screen), press ctrl+break(pause)

Router>enable

Router#copy start run

Router#config terminal

Router(config)#enable secret 1234

Router(config)#config-register ox2102

Router(config)#end

Router#write

Router#reload

Switch Password Recovery

1. Principle: When the switch is saved, the stored file name is config.text. When the switch starts up, it looks for config.text and loads the user configuration.
2. When recovering the password, just rename config.text, such as config.text.old. After the switch starts, change the file name back.
3. Detailed steps
(1) The switch does not have a power switch. After unplugging the power cord, press and hold the MODE button and then plug in the power until the switch appears on the screen and let go.
(2) Initialize
switch: flash_init
(3) Change the file name
switch: rename flash:config.text flash:config.text.old
(4) Start the switch
switch: boot After booting, the configuration config.text will be read, but it cannot be found (5) After entering the
privileged mode, change the file name back to
switch# rename flash:config.text.old flash:config.text
(6) Load the contents of the save disk into the memory
switch# copy flash:config.text system:running -config
(7) save the file after changing the password