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Disaster Recovery on Cisco 837

Dear All,

I have a Cisco 837 ADSL router which has a corrupted IOS (boots only in rommon). I am following the procedures however I just keep getting the following error:

rommon 1 > ip_address=192.168.1.2
rommon 2 > ip_subnet_mask=255.255.255.0
rommon 3 > default_gateway=192.168.1.1
rommon 4 > tftp_server=192.168.1.1
rommon 5 > tftp_file=c837-k9o3sy6-mz.123-2.XE
rommon 6 > tftpdnld

Missing or illegal ip address for variable IP_ADDRESS
Illegal IP address.

usage: tftpdnld [-ur]
Use this command for disaster recovery only to recover an image via TFTP.
Monitor variables are used to set up parameters for the transfer.
(Syntax: "VARIABLE_NAME=value" and use "set" to show current variables.)
"ctrl-c" or "break" stops the transfer before flash erase begins.

The following variables are REQUIRED to be set for tftpdnld:
IP_ADDRESS: The IP address for this unit
IP_SUBNET_MASK: The subnet mask for this unit
DEFAULT_GATEWAY: The default gateway for this unit
TFTP_SERVER: The IP address of the server to fetch from
TFTP_FILE: The filename to fetch

The following variables are OPTIONAL:
TFTP_VERBOSE: Print setting. 0=quiet, 1=progress(default), 2=verbose
TFTP_RETRY_COUNT: Retry count for ARP and TFTP (default=7)
TFTP_TIMEOUT: Overall timeout of operation in seconds (default=7200)
TFTP_CHECKSUM: Perform checksum test on image, 0=no, 1=yes (default=1)

Command line options:
-r: do not write flash, load to DRAM only and launch image
-u: upgrade the rommon, system will reboot once upgrade is complete

Please advise.

Thank you,
REX

ASKER CERTIFIED SOLUTION

gpriceee

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gpriceee

The assumption is that the tftp_file name is correct as are the addresses. If not, make them accurate.

rex68

ASKER

Hi gpricee,

Thank you for your reply.

I've changed the checksum to 0 but it is still giving me the same error and I've assured that all IP addresses and filename are accurate.

Anything else I could possibly try?

Cheers,
REX

gpriceee

These commands, assuming nothing is inaccurate seem correct:
rommon 1 > ip_address=192.168.1.2
rommon 2 > ip_subnet_mask=255.255.255.0
rommon 3 > default_gateway=192.168.1.1
rommon 4 > tftp_server=192.168.1.1
rommon 5 > tftp_file=c837-k9o3sy6-mz.123-2.XE
rommon 6 > tftpdnld

The next thing you get should be a warning, and all you have to do is hit y

Is your tftp server the same as your default gateway?
Is the extension on the tftp file correct?

gpriceee

I just looked at it again, and the filename seems incomplete.
.bin

JFrederick29

The variables are case sensitive, use upper case:

rommon 1 > IP_ADDRESS=192.168.1.2
rommon 2 > IP_SUBNET_MASK=255.255.255.0
rommon 3 > DEFAULT_GATEWAY=192.168.1.1
rommon 4 > TFTP_SERVER=192.168.1.1
rommon 5 > TFTP_FILE=c837-k9o3sy6-mz.123-2.XE
rommon 6 > tftpdnld

rex68

ASKER

Hi Lads,

I've managed to do it through XMODEM..

Thanks for all replies.