Cisco Router IOS up gradation from ROMMON mode by TFTP
Sometimes When router’s IOS is crashed or may be by any other reason Router is going into ROMMON mode and we have to load the IOS from ROMMON mode, Then at that time we mostly we use Xmodem. But it consumes lot of time. Here is another method which we can use for upgradation. Here you can connect your laptop to router f0 port.
The command is tftpdnld which is used to download the new image from TFTP server to router.
Before you can enter the tftpdnld command, you must set the ROMMON variables.
Rommon> set (This command is to see the variables/parameters)
U will see the parameters which is used of tftpdnld (tftpdnld –r).
To change the variable in rommon mode
Rommon> TFTP_FILE=c1841-adventerprisek9-mz.124-11.T.bin (In this way you can change the variables values, try exactly)
Same way u can configure the other variables and then use the tftpdnld –r
It will take 5 -8 mins to load the IOS.
Then after loading it will load form IOS then check whether the IOS is loaded form flash or not.
In this way you can save your time when you are recovering a router from ROMMON Mode.