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supervisor engine stuck in rommon mode

Hi i have two supervisor engines on my cisco 4510r router, one of the supervisor engines is stuck in rommon mode, i tried to boot the image on the bootflash but it's corrupted, i followed the following document to boot the image on my tftp server, but i'm still stuck in rommon.

rommon 1 >set

PS1=rommon ! >


RET_2_RTS=01:57:36 UTC Thu Jan 20 2005














rommon 2 >boot tftp://

Tftp Session details are ....

Filename     : /cat4500-entservices-mz.122-53.SG.bin

IP Address   :

Loading from TftpServer:

Received data packet #  33318

Loaded 17058788 bytes successfully.

Rommon reg: 0x5F004380

#########POST image corrupt, reloading



*                                                        *

* Welcome to Rom Monitor for      WS-X4516 System.       *

* Copyright (c) 2003-2007 by Cisco Systems, Inc.         *

* All rights reserved.                                   *

*                                                        *


Rom Monitor Program Version 12.2(31r)SGA1

Supervisor: WS-X4516  Chassis: WS-C4510R

Hardware Revisions - Board: 3.8 CPLD: 6 Dagobah: 95

MAC Address  : 00-0c-30-ab-9f-b4

IP Address   :

Netmask      :

Gateway      : Not set.

TftpServer   : Not set.

Main Memory  : 512 MBytes

***** The system will autoboot in 5 seconds *****

Type control-C to prevent autobooting.

. . . . .

Established physical link 100MB Full Duplex

Network layer connectivity may take a few seconds

******** The system will autoboot now ********

config-register = 0x2

Autobooting using BOOT variable specified file.....

Could not find a valid file in BOOT environment variable.

BOOT variable can be set from IOS. To find currently set

Rom Monitor variables, please type 'set' command.

For help on choosing a boot method,  type 'confreg' command.

rommon 1 >

Hall of Fame Super Silver

supervisor engine stuck in rommon mode

Have you validated the image on your tftp server? (i.e. check the MD5 checksum with that posted on CCO)

If that looks good, I'd try removing the corrupt image from bootflash then copy (via tftp) the validated image into bootflash from rommon. Then boot from bootflash.

Hall of Fame Super Blue

supervisor engine stuck in rommon mode

#########POST image corrupt, reloading

As what Marvin said, your IOS is corrupt.

After you have downloaded the file from the Cisco website, compare that file's MD5 hash value against the value in the Cisco website.  If it doesn't match, then it's corrupted.

Community Member

supervisor engine stuck in rommon mode

i have compared the checksum of the image on my tftp with cisco cco and they match, and the copying of the image from the tftp to DRAM is ok as evident from previus output but i think when it reloads it loads the old image which is still on the bootflash instead of the one from tftp. is there a way to delete the image on bootflash and copy the image directly to the bootflash (without erassing my other files i.e startup-config,...).

from cisco site: 3653080ad3ca431c074b153ffd2a08b9

from tftp ==>3653080ad3ca431c074b153ffd2a08b9

supervisor engine stuck in rommon mode


I found a similar discussion, apparently the solution was to format bootflash: and doing the procedure again.

It's worth a try, I think.

Hope that helps


Community Member

supervisor engine stuck in rommon mode

Hi can any one assist on this, last comment about erassing bootflash dosn't work. The image is on bootflash,in rommon there is no command for format. is there any way to update the stuck engine with a different ios and then bring it to synch after with the active one.

Hall of Fame Super Blue

supervisor engine stuck in rommon mode

in rommon there is no command for format.

Try:  format bootflash:

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