Cisco router enters Rommon mode, Flash lost, swipe iOS method

1. Preparation Tools

Cisco TFTP server, HyperTerminal, iOS files

iOS files are not easy to find, you need to look at the hardware version, as well as the size of ROM RAM, to my Cisco 2621XM for example (with two fastethernet),
Start looking for a few 2600 of iOS, the brush is not correct, the problem of unrecognized network interface, can not be configured, there should be F interface with S Ios,cisco 2621 XM can use C2600-ik8s-mz.122-11.t.bin

2, through TFTP to redo the router system

The control line connects the router, with the twisted pair TFTP server and the router's F0 port

At the Rommon prompt, enter the following command (if the brush system fails and you want to re-enter Rommon mode, you can restart the router and use the Ctrl+break key combination in 30 seconds to enter Rommon mode)

The code is as follows	Copy Code
Rommon 1 >ip_address= Router IP address (to be within the same network segment as the TFTP server) Rommon 2 >ip_subnet_mask= Router subnet mask Rommon 3 >defaut_gateway= Default gateway address (can not or can be a TFTP server) Rommon 4 >tftp_server= TFTP server IP Address Rommon 5 >tftp_file= ios filename (file name and suffix only, no path required) Rommon 6 >TFTPDNLD Carriage return

Note: The preceding commands must use uppercase, and the last tftpdnld should be lowercase.

After the TFTPDNLD command executes, depending on the size of the iOS file, usually waits 10-30 minutes to complete the return to the Rommon command, entering reset to reboot the router to enter the normal system.