The simplest way for Cisco routers to recover iOS in Rommon state

It was a lot of years ago. One day suddenly monitored a 2610 router interrupt, ran to the scene with console login, appeared Rommon 1 > tips, and unable to enter the formal iOS system.

The first reaction was that iOS in Flash was destroyed or lost, and after a few simple steps, the router quickly resumed its normal operation. There are several methods on the network, but I think the TFTP method is the most efficient, and I also recommend this approach.

Install the TFTP server Software on a machine, with everyone familiar with the 3CDaemon is good, put the iOS file in the TFTP server's default root directory, open the TFTP server, with the control line to connect this machine with the router. In addition, a crossover cable is used to connect the machine's network card and the Ethernet port of the router, and the IP address is configured to 192.168.0.100.

After doing the above work, open the machine's HyperTerminal tool, connect to the router, and the command line prompt appears in the window:

ROMMON 1 > (where "1" represents the number of lines in the command line). Enter the command after the prompt:

===================================================================

ROMMON 1 >ip_address = Router IP address

ROMMON 2 >ip_subnet_mask = Router Subnet mask

ROMMON 3 >defaut_gateway = Default gateway address

ROMMON 4 >tftp_server = TFTP server IP address

ROMMON 5 >tftp_file = iOS file name

ROMMON 6 >tftpdnld

===================================================================

Rommon 1 >ip_address=192.168.0.1 (is the IP address of the router)

Rommon 2 >ip_subnet_mask=255.255.255.0

Rommon 3 >default_gateway=192.168.0.2

Rommon 4 >tftp_server=192.168.0.100

Rommon 5 >tftp_file=c2600-js-mz[1].122-12a.bin

Rommon 6 >Sync

Rommon 7 >set

Rommon 8 >tftpdnld

Note: The previous commands must be capitalized, and the last tftpdnld will be lowercase.

After the TFTPDNLD command executes, the file transfer can be completed as soon as the prompt is selected.

When the file is finished, it will automatically return to the command line, enter reset restart router,

After rebooting, you are back in the familiar iOS mode, and even the previously configured information is not lost.

This article from "Hai na Hundred Chuan" blog, reproduced please contact the author!

The simplest way for Cisco routers to recover iOS in Rommon state