(Optional) CRC-16 checksumming, which is more sophisticated and thorough than standard checksumming. This table describes the command syntax for the xmodem command.
Here is the command syntax for xmodem : xmodem For example, to download Cisco IOS Software Release 12.1(16) IP Plus image to a Cisco 1600 Series Router with a speed of 38400 bps takes approximately 25 minutes. 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. 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 console is the only viable option. Xmodem can be used on a group of routers (see Components Used) 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. Refer to Cisco Technical Tips Conventions for more information on document conventions. If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. Note: Xmodem can also be used on other Catalyst switches. The information in this document is based on these software and hardware versions:Ĭisco 827, 1600, 1700, 2600, 3600, and 3700 Series RoutersĬisco AS5200, AS5300, AS5350, and AS5400 Universal Access Servers There are no specific requirements for this document. This document describes how to use the xmodem command at the console to download Cisco IOS® software with the ROM monitor (ROMmon).
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