Today tip will help
you to install the router IOS to a Cisco 2500/2600/2800/3800 series
routers. First make sure, you have installed and configured any TFTP (Trivial
File Transfer Protocol) server over the LAN port. If you are
trying to boot up your router
without an IOS, the
nonworking router will boot up in ROMmom
mode and the router
first prompt will look like this:
rommon>
First run the set command to verify the ROMmom default variables.
In this mode all commands are case sensitive.
rommon1>set
Now run the TFTP download command to start the restore image process then press the enter button.
rommon 2> tftpdnld
After running the
tftpdnld command, the following information will appear as under:
Now type the following information, for example router ip address, mask
and default gateway then tftp server address.
rommon 3 >
IP_ADDRESS=10.1.1.2 (router ip address)
rommon 4 >
IP_SUBNET_MASK=255.0.0.0 (default subnet mask)
rommon 5 >
DEFAULT_GATEWAY=10.1.1.2 (gateway address)
rommon 6 >
TFTP_SERVER=10.1.1.1
(tftp server address)
rommon 7 >
TFTP_FILE=12.0(4)t
(IOS file name)
Now again run the tftpdnld command to start recovery process
immediately.
rommon 8 > tftpdnld
IP_ADDRESS: 10.1.1.2
IP_SUBNET_MASK:
255.0.0.0
DEFAULT_GATEWAY:
10.1.1.2
TFTP_SERVER: 10.1.1.1
TFTP_FILE: 12.0(4)t
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]: Yes
Receiving 12.0(4)t from
10.1.1.1 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
File reception
completed.
Copying file 12.0(4)t
to flash.
Erasing flash at
0x60100000
Now run the reset command to restore router as factory default
settings.
rommon 16 > reset
Now after some time, your router will boot up with factory default
settings.
COMPUTER TIPS