always boot into ROMMON ,can manually boot from flash

Sonnywo · ‎12-30-2021

My cisco2921 router always boots into ROMMON. I can manually boot it by using the IOS in flash0.

What's the problem? what can I do?

Thanks in advance!

The following is the output of console:

System Bootstrap, Version 15.0(1r)M16, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Total memory size = 512 MB - On-board = 512 MB, DIMM0 = 0 MB

CISCO2921/K9 platform with 524288 Kbytes of main memory

Main memory is configured to 72/-1(On-board/DIMM0) bit mode with ECC enabled

Readonly ROMMON initialized

program load complete, entry point: 0x80803000, size: 0x1b340

IOS Image Load Test

___________________

Signature did not verify

Signature DID NOT VERIFY

boot: cannot load "flash0:"

System Bootstrap, Version 15.0(1r)M16, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Total memory size = 512 MB - On-board = 512 MB, DIMM0 = 0 MB

CISCO2921/K9 platform with 524288 Kbytes of main memory

Main memory is configured to 72/-1(On-board/DIMM0) bit mode with ECC enabled

Readonly ROMMON initialized

Compact Flash1: Not present

...... ......

rommon 2 > dir flash0:

program load complete, entry point: 0x80803000, size: 0x1b340

Directory of flash0:

2 97991400 -rw- c2900-universalk9-mz.SPA.152-4.M2.bin

23926 3064 -rw- cpconfig-29xx.cfg

24307 0 drw- ccpexp

24837 2464 -rw- home.shtml

23927 229065 -rw- crashinfo_20131015-093011-UTC

rommon 3 > boot flash0:c2900-universalk9-mz.SPA.152-4.M2.bin

program load complete, entry point: 0x80803000, size: 0x1b340

IOS Image Load Test

___________________

Digitally Signed Release Software

program load complete, entry point: 0x81000000, size: 0x5d736b0

Self decompressing the image : #################################################

...... ......

C2921>

Leo Laohoo · ‎12-30-2021

Post the complete output to the command "sh version".

The boot-variable string could be configured to boot into ROMMON.

Sonnywo · ‎12-30-2021

Thanks!

C2921>show version

Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.2(4)M2, REL

EASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Compiled Wed 07-Nov-12 14:08 by prod_rel_team

ROM: System Bootstrap, Version 15.0(1r)M16, RELEASE SOFTWARE (fc1)

C2921 uptime is 5 minutes

System returned to ROM by power-on

System image file is "flash0:c2900-universalk9-mz.SPA.152-4.M2.bin"

Last reload type: Normal Reload

Last reload reason: power-on

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to

export@cisco.com.

Cisco CISCO2921/K9 (revision 1.0) with 487424K/36864K bytes of memory.

Processor board ID FGL1711115S

3 Gigabit Ethernet interfaces

1 terminal line

DRAM configuration is 64 bits wide with parity enabled.

255K bytes of non-volatile configuration memory.

250880K bytes of ATA System CompactFlash 0 (Read/Write)

License Info:

License UDI:

-------------------------------------------------

Device# PID SN

-------------------------------------------------

*0 CISCO2921/K9 FGL1711115S

Technology Package License Information for Module:'c2900'

-----------------------------------------------------------------

Technology Technology-package Technology-package

Current Type Next reboot

------------------------------------------------------------------

ipbase ipbasek9 Permanent ipbasek9

security None None None

uc None None None

data None None None

Configuration register is 0x2102

Leo Laohoo · ‎12-30-2021

@Sonnywo wrote:

boot: cannot load "flash0:"

Can we see the output to the following commands:

sh run | include boot
sh bootvar

Update the firmware of the router as well. The current one is >7 years old.

Sonnywo · ‎01-03-2022

It works now. Thank you so much!

The output and what I did:

rommon 4 > confreg

Configuration Summary

(Virtual Configuration Register: 0x2102)

enabled are:

load rom after netboot fails

console baud: 9600

boot: image specified by the boot system commands

or default to: cisco2-CISCO2921/K9

do you wish to change the configuration? y/n [n]:

... ...

C2921(config)#boot system flash0 c2900-universalk9-mz.SPA.152-4.M2.bin

... ...

Leo Laohoo · ‎01-03-2022

@Sonnywo wrote:

C2921(config)#boot system flash0 c2900-universalk9-mz.SPA.152-4.M2.bin

The boot variable string syntax is not correct.

The router will boot the first useable image.

Sonnywo · ‎01-03-2022

syntax is not correct？ but the system didn't give an error:

C2921(config)#boot system flash0 c2900-universalk9-mz.SPA.152-4.M2.bin

C2921(config)#exit

C2921#wr

Leo Laohoo · ‎01-03-2022

@Sonnywo wrote:

syntax is not correct？ but the system didn't give an error:

Because you were not watching carefully. The syntax boot system flash0 c2900-universalk9-mz.SPA.152-4.M2.bin is not correct.
But it is OK. The developers have coded a fall-back where the router will boot the first useable IOS.

Sonnywo · ‎01-04-2022

Thanks for you patience!