This page describes the procedure to recover Cisco 4500 and 4700 Series Routers stuck in ROMmon (rommon# > prompt).
For more information on document conventions, see the Cisco Technical Tips Conventions.
There are no specific prerequisites for this document.
The information in this document is based on the hardware versions below:
Cisco 4500 and 4700 Series Routers
The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it.
Follow the instructions provided below:
Issue the dev command to see which devices are available on your router:
rommon 1 > dev Devices in device table: id name flash: flash bootflash: boot flash eprom: eprom rommon 2 >
Issue the dir flash: command, and then look for a valid Cisco IOSĀ® software image:
rommon 3 > dir flash: File size Checksum File name 8052512 bytes (0x7adf20) 0xc7b6 c4500-js-mz.121-6 rommon 4 >
You can also use the dir bootflash:command to examine the bootflash for a valid boot image.
Try to boot from that image. If the file is valid, this brings you back to normal operation mode:
rommon 5 > boot flash:c4500-js-mz.121-6 program load complete, entry point: 0x80008000, size: 0x7ade04 Self decompressing the image : ##################################### #################################################################### ####...
If none of the files are valid, you need to download a new one. There is only one way to install an image on the Cisco 4500 and 4700 Series Routers if the main Cisco IOS software has been deleted or corrupted: use the router's boot image.
For detailed instructions on this procedures, see How to Upgrade from ROMmon Using TFTP with Boot Image.
If both the main image and the boot image are corrupted or deleted, there is no easy way to recover the router. Aside from a return materials authorization (RMA), the only other option is to swap flash single in-line memory modules (SIMMs) from another 4500 or 4700 router that has a valid boot image and a main Cisco IOS software.
Revision | Publish Date | Comments |
---|---|---|
1.0 |
23-Jan-2008 |
Initial Release |