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Recovery of IOS image through xmodem connection   Filed Under: Networks

Introduction

This tutorial will concentrate on the recovery of the IOS on a Cisco Catalyst switch when the IOS image got corrupted or is being deleted from the switch. The application used to tranfer the IOS image was Hyperterminal. If anyone know how to use another program to transfer a file using xmodem please tell me and I will add it to the tutorial (with the mention of your name of course).

When the switch cannot load the IOS at boot time it will load the boot loader. The prompt of the boot loader is:

switch:

Procedure

The step needed to transfer the IOS image through the xmodem connection are:

1. Enter flash_init command to initialize the flash system.

   switch: flash_init
   Initializing Flash...
   ...The flash is already initialized.

2. Enter copy xmodem: flash:image_filename

   switch: copy xmodem: flash:c2950-i6q4l2-mz.121-20.EA2.bin
   Begin the Xmodem or Xmodem-1K transfer now...
   CCCCCCCCC

3. When the CCCCC start to appear in the Hyperterminal go to:
   • Menu “Transfer”
   • Select “Send File…”
   • Select Browse and select the image file you want to send to the switch.
   • Under Protocol select “1K Xmodem”
   • Click on “Send”

   After you click on send this will show you a window with the transfer status of IOS file. This my take at least an hour to transfer.

4. Once the transfer is finished just issue the command boot to load the IOS image on the switch.

   Switch: boot