Private Pix. This document explains how to use the xmodem command at the console to download Cisco IOS® software using the ROM monitor (ROMmon). There are no specific requirements for this document. The information in this document is based on these software and hardware versions: • Cisco 827, 1600, 1700, 2600, 3600, and 3700 Series Routers • Cisco AS5200, AS5300, AS5350, and AS5400 Universal Access Servers Note: Xmodem can also be used on certain Catalyst switches.

Enter your choice or press 'ESC' to exit: Downloading code using XMODEM. SRW2024 Stuck in Loop after Firmware upgrade. The Very Best Of Shocking Blue Download Arrow on this page. If files are being transmitted.

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration.

If your network is live, make sure that you understand the potential impact of any command. Refer to for more information on document conventions. Xmodem can be used on a group of routers (see ) and is used in disaster recovery situations where the router has no valid Cisco IOS software or bootflash image to boot from and hence, only boots up in ROMmon. This procedure can also be used where there are no Trivial File Transfer Protocol (TFTP) servers or network connections, and a direct PC connection (or through a modem connection) to the router's console is the only viable option.

Because this procedure relies on the console speed of the router and the serial port of the PC, it can take a long time to download an image. For example, downloading Cisco IOS Software Release 12.1(16) IP Plus image to a Cisco 1600 Series Router using a speed of 38400 bps takes approximately 25 minutes. Here is the command syntax for xmodem as per the. Xmodem [-c] [-y] [-e] [-f] [-r] [-x] [-s data-rate] This table describes the command syntax for the xmodem command.

Syntax Description -c (Optional) CRC-16 checksumming, which is more sophisticated and thorough than standard checksumming. -y (Optional) Uses the Ymodem protocol for higher throughput. -e (Optional) Erases the first partition in Flash memory before starting the download.

This option is only valid for the Cisco 1600 series. -f (Optional) Erases all Flash memory before starting the download. This option is only valid for the Cisco 1600 series routers. -r (Optional) Downloads the file to DRAM. The default is Flash memory. -x (Optional) Does not execute the Cisco IOS software image on completion of the download.

-s data-rate (Optional) Sets the console port's data rate during file transfer. Values are 1200, 2400, 4800, 9600, 19200, 38400, and 115200 bps. The default rate is specified in the configuration register. This option is only valid for the Cisco 1600 series routers. Filename (Optional) Filename to copy. This argument is ignored when the -r keyword is specified since only one file can be copied to DRAM. On the Cisco 1600 series routers, files are loaded to the ROMmon for execution.

Note: xmodem options e, f, and s are only supported on the Cisco 1600 Series Routers. Xtrap Online Game Security Solution Provider Download Youtube. In order to find out the syntax and available options to use with the xmodem command, enter xmodem -?

At the ROMmon prompt. Here is an example of the xmodem command issued on a Cisco 1603 Router: rommon 9 >xmodem -?

Usage: xmodem [-cyrxefs] -c CRC-16 -y ymodem-batch protocol -r copy image to dram for launch -x do not launch on download completion -f Perform full erase of flash -e Perform erase of first flash partition -sSet speed of Download, where speed may be 1200 2400 4800 9600 0 115200 Here is an example of the xmodem command issued on a Cisco 2620 Router: rommon 1 >xmodem -? Xmodem: illegal option --? Usage: xmodem [-cyrx] -c CRC-16 -y ymodem-batch protocol -r copy image to dram for launch -x do not launch on download completion rommon 12 >xmodem -cfs115200 c1600-sy-mz.121-16.bin rommon 2 >xmodem -c c2600-is-mz.122-10a.bin Notes: • The xmodem transfer only works on the console port. You can only download files to the router.

You cannot use xmodem to get files from the router. • It is also important to note that the -sdata-rate option is only available on the Cisco 1600 Series Routers and was implemented to overcome the console baud rate limitation of 9600 bps. If you specify -sdata-rate of 115200 bps for example, you can increase the download rate and hence, reduce download time. Other Cisco routers support console speeds up to 115200 bps. Therefore, the -sdata-rate option is not required. • Ensure that the PC serial port is using a 16550 universal asynchronous transmitter/receiver (UART) if you are downloading a Cisco IOS software image through the router's console speed at 115200.