Router out of mem since Image update - constantly rebooting

Unanswered Question
Aug 9th, 2007

I have a cisco 837 router, I have updated the routers IOS and it seems the image could be too big, as it boots up it's says it's out of memory then reboots and so on and so on. I want to put a smaller image (IOS) back on to it, but if it keeps rebooting I can't, any ideas around this?

I have this problem too.
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Pavel Bykov Thu, 08/09/2007 - 04:48

You need to connect to the router using console cable and break the boot sequence. You will enrer rommon. Ther you will need to delete the new image and load the old image.

whiteford Thu, 08/09/2007 - 04:57

I'm trying:

rommon 1 > set IP_ADDRESS=ip_address

rommon 1 > set IP_SUBNET_MASK=ip_subnet_mask

rommon 1 > set DEFAULT_GATEWAY=default_gateway

rommon 1 > set TFTP_SERVER=TFTP_server

rommon 1 > set TFTP_FILE=TFTP_file

rommon 1 > save

but set is not found?

it says :

rommon 1 > set

BSI=0

RET_2_RUTC=0

RET_2_RTS=15:56 UTC Aug 1 2007

CRASHINFO=flash:crashinfo_20020301-000042

?=1

whiteford Thu, 08/09/2007 - 05:13

I can't get to that, only rommin:

I'm trying:

rommon 1 > set IP_ADDRESS=ip_address

rommon 1 > set IP_SUBNET_MASK=ip_subnet_mask

rommon 1 > set DEFAULT_GATEWAY=default_gateway

rommon 1 > set TFTP_SERVER=TFTP_server

rommon 1 > set TFTP_FILE=TFTP_file

rommon 1 > save

but set is not found?

it says :

rommon 1 > set

BSI=0

RET_2_RUTC=0

RET_2_RTS=15:56 UTC Aug 1 2007

CRASHINFO=flash:crashinfo_20020301-000042

?=1

whiteford Thu, 08/09/2007 - 05:27

Tried that it keeps rebooting, my image erazed the boot (only) image on the router.

Pavel Bykov Thu, 08/09/2007 - 05:33

Try "dnld" command to load the image using xmodem. You can use hyperterminal (or other terminal emulation software you are using) and send the software using console cable.

whiteford Thu, 08/09/2007 - 05:36

I have putty and HT, on my laptop I have a tftp server running with a good image. Can you explain how I will do this please?

Thanks

spremkumar Thu, 08/09/2007 - 05:45

hi

try with HT ...

did u try dnld command as mentioned out by Pavlo ?

regds

whiteford Thu, 08/09/2007 - 05:49

I'm trying to, but what are the commands etc to do this?

I have the imagine on my laptop and on a tftp server on my laptop. My laptop has a console cable connect to the router.

spremkumar Thu, 08/09/2007 - 05:51

hi

can you issue "?" and paste the available commands out there in ur current prompt wherever you are stuck up at present ?

regds

whiteford Thu, 08/09/2007 - 05:57

!rommon 18 > ?

alias set and display aliases command

boot boot up an external process

break set/show/clear the breakpoint

confreg configuration register utility

cont continue executing a downloaded image

context display the context of a loaded image

cookie display contents of cookie PROM in hex

dev list the device table

dir list files in file system

dis display instruction stream

dnld serial download a program module

frame print out a selected stack frame

help monitor builtin command help

history monitor command history

meminfo main memory information

repeat repeat a monitor command

reset system reset

set display the monitor variables

stack produce a stack trace

sync write monitor environment to NVRAM

sysret print out info from last system return

tftpdnld tftp image download

unalias unset an alias

unset unset a monitor variable

xmodem x/ymodem image download

whiteford Fri, 08/10/2007 - 01:59

I can't log into that website I don't have authority, do you have another link?

whiteford Fri, 08/10/2007 - 02:51

Think the router is dead, i Tried this:

but tftpdnld is recognised but -r is not

rommon 1 > tftpdnld -r

Note The -r variable is optional. Entering this variable downloads and boots the new software but does not save the software to Flash memory. You can then use the image that is in Flash memory the next time you enter the reload command.

You will see output similar to the following:

IP_ADDRESS: 1.3.6.7

IP_SUBNET_MASK: 255.255.0.0

DEFAULT_GATEWAY: 1.3.0.1

TFTP_SERVER: 223.255.254.254

TFTP_FILE: c806-sy-mz

Invoke this command for disaster recovery only.

WARNING: all existing data in all partitions on flash will be lost!

Do you wish to continue? y/n: [n]:

Step 3 If you are sure that you want to continue, enter y in response to the question in the output:

Do you wish to continue? y/n: [n]:y

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