Hi,
i had similar incident with my 871 router, i discovered it was a case of corrupted ios. This is how to resolved it:
First download the required ios u need to a tftp server.
Make sure the tftp server has an active connection to the router, preferably have a direct connection between the tftp server and the router interface so that they will be on the same subnet.
use tftpdnld command in romon.
when the router boots to the romon environment, use the 'set' command to view the Rommon environment variables.
rommon 3 > set
PS1=rommon ! >
IP_ADDRESS=172.18.16.76
IP_SUBNET_MASK=255.255.255.192
DEFAULT_GATEWAY=172.18.16.65
TFTP_SERVER=172.18.16.2
TFTP_FILE=quake/rel22_Jan_16/c2600-i-mz
the variables to set for tftpdnld are
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
rommon 14 >
Look at an example i got from a reference i was refered to:
Example
rommon 16 > IP_ADDRESS=171.68.171.0
rommon 17 > IP_SUBNET_MASK=255.255.254.0
rommon 18 > DEFAULT_GATEWAY=171.68.170.3
rommon 19 > TFTP_SERVER=171.69.1.129
rommon 20 > TFTP_FILE=c2600-is-mz.113-2.0.3.Q
rommon 21 > tftpdnld
IP_ADDRESS: 171.68.171.0
IP_SUBNET_MASK: 255.255.254.0
DEFAULT_GATEWAY: 171.68.170.3
TFTP_SERVER: 171.69.1.129
TFTP_FILE: c2600-is-mz.113-2.0.3.Q
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]: y
Receiving c2600-is-mz.113-2.0.3.Q from 171.69.1.129 !!!!!.!!!!!!!!!!!!!!!!!!!.!!
File reception completed.
Copying file c2600-is-mz.113-2.0.3.Q to flash.
Erasing flash at 0x607c0000
hope this helps.
Tom
