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Loading Cisco IOS using TFTPDNLD !

By on May 14, 2005 in Networking | 0 comments

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Suppose you lost your Cisco flash memory and you need to download a new IOS using ROMmon mode, my Friend Ahmed Magdy who is my Cisco instructor as well, gave me the following instructions.

Step 1:
Put your TFTP Server and Cisco router on a LAN segment. You should know TFTP Server IP address, IOS image name, Subnet mask of the network which your TFTP Server is connected to, and if your router is not connected to the same LAN of your TFTP Server you should use the gateway address as well.

Step 2:
Follow these commands,


rommon 1> IP_ADDRESS=10.1.1.110
rommon 2> IP_SUBNET_MASK=255.255.255.0
rommon 3> DEFAULT_GATEWAY=10.1.1.111
rommon 4> TFTP_SERVER=10.1.1.111
rommon 5> TFTP_FILE=c2600-jsx-mz.122-10a.bin
rommon 6> TFTP_VERBOSE=2
rommon 7> TFTP_CHECKSUM=0
rommon 7> tftpdnld

IP_ADDRESS: 10.1.1.3
IP_SUBNET_MASK: 255.255.255.0
DEFAULT_GATEWAY: 10.1.1.3
TFTP_SERVER: 10.1.1.3
TFTP_FILE: c2600-js-mz.120-8.bin

Try to memorize, this is a useful comment for a network expert….
You can check following links as well,
http://www.cisco.com/warp/public/471/76.html
http://www.cisco.com/warp/public/471/76.pdf

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