![]() ![]() You will need to 'write memory' if you want the new factory default config you have to be there when you reboot. This will make the router boot normally, using the config file. When you get to the prompt, use 'enable', then 'configure terminal', then 'config-register 0x2102'. Power cycle the router again and you should be looking at the factory IOS bootup. Supports baud rates from 75bps to 12Mbps, multiple stop bit and parity types. ![]() Run it without arguments to get a question-answer style menu you can step through, or if you just want it to boot without reading the config file (factory reset): Easily add an RS-232 9-pin serial port to any computer with our PL2303-DB9 USB to Serial Adapter This adapter will let you connect older serial devices to modern computers, for terminal services, data transferring, remote control, and programming. If you made it into ROMMON, you can change the way that the router boots up with the 'confreg' command. ![]() Reconnect screen with the correct speed (the default is 9600) and press enter - you should be looking at a Rommon 2> prompt. screen's output will not be normal while connected at this speed, and this is normal. Reconnect screen with a serial port speed of 1200, power on the router, then press and hold the space bar for 20-30 second (or up to a minute to be safe). CTRL-B is a screen command to send the serial break sequence to your serial connection.Ģ. CTRL-A breaks the keyboard control out of what screen is showing you, allowing you to then enter a keyboard command that screen will process instead of sending it to your serial connection. Press it multiple times as soon as power is applied to the router to try to catch it at the right time. There are two good methods:ġ. For the 'screen' program that comes with OS X: CTRL-A, CTRL-B So, enter the break sequence after you turn your router on and before IOS loads. Some newer Cisco routers don't display anything to the serial console until after this time window. Your terminal should now be connected to the serial port.īoot your Cisco router into ROMMON by power cycling it and then entering the break sequence before it starts to boot IOS - this is usually within the first 20 or 30 seconds of booting. Connect to that device using 'screen' with 9600 serial port speed: I'm using a USB-to-serial adapter with a Prolific 2303 chipset on my Mac with Mountain Lion to reset a Cisco router.Īfter you install either of the drivers on your Mac, it will show up as a device in '/dev/'.
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