Downloading IOS using TFTPDNLD on Cisco 1841 Router

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Before starting this process, make sure you have a TFTP server program (TFTPD32 is a good one). Also make sure you have the IOS bin file you want to load onto the router.


Get Server Ready

  1. Make sure your TFTP server is installed and running.
  2. Give the server the IP address 10.0.0.254.
  3. Point the server to the directory holding the IOS file you want to load onto the router.

Download IOS onto router

  1. Get connected to the router using Hyperterminal.
  2. Turn on the router and hit CTRL-break on the keyboard as the router is loading to get into ROMmon mode.
  3. Type the following commands into the router:
    1. IP_ADDRESS=10.0.0.1
    2. IP_SUBNET_MASK=255.255.255.0
    3. DEFAULT_GATEWAY=10.0.0.254
    4. TFTP_SERVER=10.0.0.254
    5. TFTP_FILE=c1841-advipservicesk9-mz.124-25b.bin
    6. tftpdnld

When it asks if you want to continue type yes.


You can also use this script by using the Paste to Host command instead: 

IP_ADDRESS=10.0.0.1
IP_SUBNET_MASK=255.255.255.0
DEFAULT_GATEWAY=10.0.0.254
TFTP_SERVER=10.0.0.254
TFTP_FILE=c1841-advipservicesk9-mz.124-25b.bin
tftpdnld
y

Just hit enter after the script copies onto the router.

  • type 'reset after the file is done downloading and the router will reset.
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