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Lab 5.2.6b Managing IOS Images with ROMmon and Xmodem

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This is a process that is needed only as an emergency when a user has deleted or erased the IOS and there is no possibility of being able to upload a new version of the IOS from a TFTP server. The first steps will show how to avoid doing this procedure. If the procedure cannot be avoided, this lab explains how to use the xmodem command at the console to download Cisco IOS® Software using the ROM monitor (ROMmon). Xmodem can be used on a group of routers (listed below) and is used in disaster recovery situations where the router has no valid Cisco IOS software. | Cisco SrsTEMS Lab 5.2.6b Managing IOS Images with ROMmon and Xmodem Straight-through cable Serial cable Console Rollover Crossover cable Objective Recover a Cisco 1700 series router stuck in ROM monitor ROMmon rommon . Learn how to avoid getting a Cisco 1700 series router stuck in ROMmon. Background Preparation This is a process that is needed only as an emergency when a user has deleted or erased the IOS and there is no possibility of being able to upload a new version of the IOS from a TFTP server. The first steps will show how to avoid doing this procedure. If the procedure cannot be avoided this lab explains how to use the xmodem command at the console to download Cisco IOS Software using the ROM monitor ROMmon . Xmodem can be used on a group of routers listed below and is used in disaster recovery situations where the router has no valid Cisco IOS software or boot flash 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 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. 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. This process is valid for the Cisco 827 1600 1700 2600 3600 and 3700 Series Routers. Setup a network similar to the one in the previous diagram. Any router that meets the interface requirements may be used. Possible routers include 800 1600 1700 2500 2600 routers or a combination. Refer to the chart at the end of the lab to correctly identify the interface identifiers to be used based on the equipment in the lab. The configuration output used in this lab is produced from 1721 series routers. Any other router used may produce slightly .