Access a Cisco device in ROMMON-mode
Cisco 2960 switch
Bypass the normal boot process and enter ROMMON mode directly upon the next reboot.
We're in ROMMON-mode.
Missing or corrupt IOS
Let's simulate a non-working IOS by "accidently" erasing the flash filesystem. Restart the switch afterwards.
The BOOT environment variable is still set to boot c2960-lanbasek9-mz.152-7.E7.bin but it's not there. The switch will not be able to boot and will enter ROMMON-mode automatically.
First disconnect the power cable from the switch. Minicom gives no output yet.
Now reconnect the power cable. The switch boots and while doing the POST, the SYST LED blinks green. This takes about X seconds. After POST, the blinking LED changes pattern. Press the Mode button once. The switch does not initialize Flash and enters ROMMON-mode.