2650 Router went into ROMON Mode

Answered Question
Mar 20th, 2010
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Hi all,


I have 2650 Router and when i started the router today it went onto Rom on mode.

due to this i had  no connectivity for my home network.

i console into router then i saw that it has Romon prompt.

i was not knowing what to do so i  reboot the router and it came backup clean.


do anyone know why this happended?

should i check some software on my router to make sure all is ok?


Also  what is best practice to shut down router gracefully if i am not using it for few days?


many thanks

mahesh

Correct Answer by Leo Laohoo about 7 years 3 months ago

If you have only one IOS then this command is redundant.  If you have more than one IOS then this command is optional.  In my years with Cisco, I've never had the opportunity to use the boot command.  I always, in my template, remove this command.


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Reza Sharifi Sun, 03/21/2010 - 06:58
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mahesh18 wrote:


Hi all,


I have 2650 Router and when i started the router today it went onto Rom on mode.

due to this i had  no connectivity for my home network.

i console into router then i saw that it has Romon prompt.

i was not knowing what to do so i  reboot the router and it came backup clean.


do anyone know why this happended?

should i check some software on my router to make sure all is ok?


Also  what is best practice to shut down router gracefully if i am not using it for few days?


many thanks

mahesh


Hi Mahesh,


A few things you can check for:

1-make sure "sh ver" shows the config register is 0X2102

2-Check "sh log" and see any errors.

3-Check flash and make sure there is no crash files.

4-also maybe you have accidentally pressed the pause key during boot and that would cause the router to go to rommom

Unfortunately, there is no gracefully way to shut down a Cisco router but turn off the switch or pull the power cord out.


HTH

Reza

Ganesh Hariharan Sun, 03/21/2010 - 08:37
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Hi all,


I have 2650 Router and when i started the router today it went onto Rom on mode.

due to this i had  no connectivity for my home network.

i console into router then i saw that it has Romon prompt.

i was not knowing what to do so i  reboot the router and it came backup clean.


do anyone know why this happended?

should i check some software on my router to make sure all is ok?


Also  what is best practice to shut down router gracefully if i am not using it for few days?


many thanks

mahesh

Hi Mahesh,


As Reza has pointed out the correct steps to trouble shoot the Romon Mode in router and check out the below link for Romon recovery mode in router Hope that Helps !!


http://www.cisco.com/en/US/products/hw/routers/ps259/products_tech_note09186a0080094a0b.shtml


Ganesh.H

mahesh18 Sun, 03/21/2010 - 10:18
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Hi ,


Again router went into rom on mode


here is setting


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-C2600

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



what should i do now ?


many thanks

mahesh18 Sun, 03/21/2010 - 11:39
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Hi all,


i did reset from ROM prompt


i get this



rommon 18 > reset

System Bootstrap, Version 12.2(8r) [cmong 8r], RELEASE SOFTWARE (fc1)
Copyright (c) 2003 by cisco Systems, Inc.
C2600 platform with 262144 Kbytes of main memory

Checksum failed on c2600-adventerprisek9-mz.124-25b.bin*************************************************
Expected checksum: 3c42, calculated checksum: 5067**********************************************************
lseek out of bounds
open: lseek error
open(): Open Error = -1
loadprog: error - on file open
boot: cannot load "flash:c2600-adventerprisek9-mz.124-25b.bin"

System Bootstrap, Version 12.2(8r) [cmong 8r], RELEASE SOFTWARE (fc1)
Copyright (c) 2003 by cisco Systems, Inc.
C2600 platform with 262144 Kbytes of main memory

lseek out of bounds
getdirent: lseek error
boot: cannot determine first file name on device "flash:"

System Bootstrap, Version 12.2(8r) [cmong 8r], RELEASE SOFTWARE (fc1)
Copyright (c) 2003 by cisco Systems, Inc.
C2600 platform with 262144 Kbytes of main memory

lseek out of bounds
getdirent: lseek error
boot: cannot determine first file name on device "flash:"

System Bootstrap, Version 12.2(8r) [cmong 8r], RELEASE SOFTWARE (fc1)
Copyright (c) 2003 by cisco Systems, Inc.
C2600 platform with 262144 Kbytes of main memory


how can i  fix this?


Thanks in advance

mahesh

Leo Laohoo Sun, 03/21/2010 - 14:13
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I think the IOS is corrupt and you need to re-upload the IOS via ROMmon.  I'm not sure if the 2650 supports TFTPDNLD command.

mahesh18 Sun, 03/21/2010 - 14:41
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Hi

Thanks for the reply


how can you figure out ios is corrupted?

Leo Laohoo Sun, 03/21/2010 - 14:56
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You've got the following errors during the boot-up process:


lseek out of bounds
open: lseek error
open(): Open Error = -1
loadprog: error - on file open
boot: cannot load "flash:c2600-adventerprisek9-mz.124-25b.bin"

mahesh18 Sun, 03/21/2010 - 15:11
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thanks

if i download new ios from cisco website will this fix the isse?


thanks again

Leo Laohoo Sun, 03/21/2010 - 15:56
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It should.

mahesh18 Sun, 03/21/2010 - 22:31
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Hi leolaohoo



i download the software from cisco site.

now it is all good.


need to know if this command in running config


boot-start-marker
boot system flash flash:c2600-adventerprisek9-mz.124-25c.bin**************************8
boot-end-marker


whats the purpose of that boot system flash if i remove from running config will then router will boot up ok

Correct Answer
Leo Laohoo Mon, 03/22/2010 - 14:35
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If you have only one IOS then this command is redundant.  If you have more than one IOS then this command is optional.  In my years with Cisco, I've never had the opportunity to use the boot command.  I always, in my template, remove this command.


Please do not forget to rate our posts.  Thank you very much.

Leo Laohoo Mon, 03/22/2010 - 15:13
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Glad to be of some assistance.

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