Cisco Systems 2600 manual Copying an Image from the Console Using the xmodem Command

Appendix B Using the ROM Monitor

Recovering Cisco IOS Software Images

Note The tftpdnld command is not available on the Cisco 2691 router. The recommended method for installing a Cisco IOS image on a Cisco 2691 router is from a CompactFlash memory card loaded in the external CompactFlash memory card slot. See the “Entering Boot Commands” procedure on page B-4.

Copying an Image from the Console Using the xmodem Command

Description and Options of the xmodem Command

The xmodem command establishes a connection between a console and the router console port for disaster recovery, if both the boot and system images are erased from flash memory.

xmodem [filename]—Establishes an Xmodem connection between the console and the router. The optional argument filename specifies the source file containing the Cisco IOS image.

Other options include the following:

•c—Use cyclic redundancy check (CRC-16).

•y—Use Ymodem transfer protocol.

•r—Copy the image to dynamic random-access memory (DRAM) for launch.

•x—Do not launch image on completion of download.

Console Requirements

The console computer (PC) must have the following files to use this procedure:

•Terminal emulation application program supporting one of the following file transfer protocols:

–Xmodem

–Xmodem–CRC

–Xmodem–1K

–Ymodem

•Cisco IOS image file

Procedure for the xmodem Command

To copy a Cisco IOS image from a console to flash memory, perform the following procedure.

Note File transfer from a console is slow and will take many minutes.

Step 1 Connect a console to the router’s console port using the instructions in the “Connecting to a Console Terminal or Modem” section on page 3-20.

Step 2 Power up the router. The power-on self-test diagnostics run and the boot ROM searches for a valid boot image and Cisco IOS image in flash memory. If the boot image and Cisco IOS image are not found, the ROM monitor prompt is displayed:

rommon 1>

Cisco 2600 Series Routers Hardware Installation Guide

OL-2171-06 B-9