Cisco Device Management

Question 1

Factory Reset a Router/Switch

Answer 1

Write Erase   (erases startup config)
Reload     (reboots device)

Then setup wizard will run

Question 2

Configuration Register

Answer 2

Can be used to change the way the router boots

IOS: config-register
ROMMON: confreg

Question 3

Configuration Register: Boot Normally

Answer 3

config-register 0x2102

Question 4

Configuration Register: Boot into ROMMON

Answer 4

config-register 0x2120

Question 5

Configuration Register: Ignore contents of NVRAM (startup-config)

Answer 5

config-register 0x2142

Question 6

Router Password Recovery: All Steps

Answer 6

Press the break sequence (Ctrl-Break) at power on to break into ROMMON
Confreg 0x2142 to ignore the startup-config on boot
Reset to reload
The router will boot up with no configuration
Enter enable mode

Copy startup config to the running config
This will copy the entire previous config into the running config including the unknown enable secret. You are already in enable mode so you don’t need to know it

Enter a new enable secret in global config to overwrite the old one
This will go into running-config
Config-register 0x2102 so the router will boot normally next restart
Copy run start to save the config (merges new enable password to startup-config)

Question 7

Switch Password Recovery

Answer 7

Almost identical to router password recovery

May have to physically press the “Mode” button on the front of the switch to break into the switch loader

Question 8

Command: Backup flash memory via TFTP

Answer 8

Copy flash tftp

Question 9

Upgrade IOS Image Steps

Answer 9

IOS images can be downloaded from
https://software.cisco.com/

After downloading, copy to device’s flash using TFTP
Copy tftp flash (then enter TFTP server IP, then enter file name)

Delete the old system image or use the boot system command