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3750 E Switch in Bootloader

I have a couple 3750 switches that I tried to upgrade and they failed.  I'm able to get them to bootloader mode, but not able to find any instructions that actually work.

I tried following the Cisco instructions, which apperantly are "incorrect", as they tell you to specify the IP of the TFTP server, when apperantly you are supposed to specify the IP of the managment interface.  I also tried following the other suggestion in the discussion, but when I get to the mgmt_init step, the switch says unrecognized command.

These are the two processes I tried:

 

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750xscg/swtrbl.html


http://blog.unolution.com/networking/how-to-recover-a-cisco-switch-3560x-3750x-from-boot-loader/

Does anyone have good steps for recovering a 3750 E from an invalid IOS installation?  RMA is not an option, as they told me the switches only had a 90 day warranty.

2 REPLIES

3750 E Switch in Bootloader

  Hi,

try with this procedure

Recovering from a Software Failure

Switch software can be corrupted during an upgrade, by downloading the wrong file to the switch, and

by deleting the image file. In all of these cases, th

e switch does not pass the power-on self-test (POST),

and there is no connectivity.

This procedure uses the Xmodem Protocol to recover from a corrupt or wrong image file. There are many

software packages that support the Xmodem Protocol, and this procedure is largely dependent on the

emulation software that you are using.

This recovery procedure requires that

you have physical access to the switch.

Step 1

From your PC, download the software image tar file (image_filename.tar) from Cisco.com.

The Cisco IOS image is stored as a bin file in a directory in the tar file. For information about locating

the software image files on Cisco.com, see the release notes.

Step 2

Extract the bin file from the tar file.

If you are using Windows, use a zip program that can read a tar file. Use the zip program to navigate

to and extract the bin file.

If you are using UNIX, follow these steps:

1.

Display the contents of the tar file by using the

tar -tvf

<

image_filename.tar

> UNIX command.

switch%

tar -tvf

image_filename.tar

2.

Locate the bin file, and extract it by using the

tar -xvf

<

image_filename.tar

>

<

image_filename.bin

> UNIX command.

switch%

tar -xvf

image_filename.tar

image_filename.bin

x c3750-ipservices-mz.122-25.SEB/c3750-ipservices-mz.122-25.SEB.bin, 3970586

bytes, 7756 tape blocks

3.

Verify that the bin file was extracted by using the

ls -l

<

image_filename.bin

> UNIX command.

switch%

ls -l

image_filename.bin

-rw-r--r--   1 boba      3970586 Apr 21 12:00

c3750-ipservices-mz.122-25.SEB/c3750-ipservices-mz.122-25.SEB.bin

Step 3

Connect your PC with terminal-emulation software supporting the Xmodem Protocol to the switch  console port.

Step 4

Set the line speed on the emulation software to 9600 baud.

Step 5

Unplug the switch power cord.

Step 6

Press the Mode button and at the same time, reconnect the power cord to the switch.

You can release the Mode button a second or two after the LED above port 1 goes off. Several lines of

information about the software appear along with instructions:

The system has been interrupted prior to initializing the flash file system. The following

commands will initialize the flash file system, and finish loading the operating system software#

flash_init

load_helper

boot

Catalyst 3750 Switch Software Configuration Guide OL-8550-02 Chapter 43      Troubleshooting Recovering from a Lost or Forgotten Password

Step 7

Initialize the flash file system:

switch:

flash_init

Step 8

If you had set the console port speed to anything othe

r than 9600, it has been reset to that particular

speed. Change the emulat

ion software line speed to match that of the switch console port.

Step 9

Load any helper files:

switch:

load_helper

Step 10

Start the file transfer by using the Xmodem Protocol.

switch:

copy xmodem: flash:

image_filename.bin

Step 11

After the Xmodem request appears, use the appropriate command on the terminal-emulation software to

start the transfer and to copy the software image into flash memory.

Step 12

Boot the newly downloaded Cisco IOS image.

switch:

boot flash:

image_filename.bin

Step 13

Use the archive download-sw privileged EXEC command to download the software image to the switch

or to the switch stack.

Step 14

Use the reload privileged EXEC command to restart the switch and to verify that the new software image

is operating properly.

Step 15

Delete the flash:

image_filename.bin

file from the switch.

Hope this procedure can help you. Some years ago a had the same problem and i recovered by xmodem procedure. This was a very long procedure, but i recovered the switch.

Hall of Fame Super Gold

3750 E Switch in Bootloader

Post the bootup sequence.  I want to see where it's actually failing.

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