Recover c3750v2 IOS from rommon

[choywy]

Hi,

I have this c3750v2 with a corrupted IOS and was not able to boot. It goes to the "switch:" prompt when I power up the switch.

How do I re-upload the IOS back to this switch? Can I do it via TFTP? The Cisco old doc only mention about xmodem transferred....

The below is all the command I have in the "switch:" prompt...

switch: ?

           ? -- Present list of available commands

        boot -- Load and boot an executable image

         cat -- Concatenate (type) file(s)

        copy -- Copy a file

      delete -- Delete file(s)

         dir -- List files in directories

  flash_init -- Initialize flash filesystem(s)

      format -- Format a filesystem

        fsck -- Check filesystem consistency

        help -- Present list of available commands

      memory -- Present memory heap utilization information

       mkdir -- Create dir(s)

        more -- Concatenate (display) file(s)

      rename -- Rename a file

       reset -- Reset the system

       rmdir -- Delete empty dir(s)

         set -- Set or display environment variables

      set_bs -- Set attributes on a boot sector filesystem

   set_param -- Set system parameters in flash

       sleep -- Pause (sleep) for a specified number of seconds

        type -- Concatenate (type) file(s)

-- MORE --

       unset -- Unset one or more environment variables

     version -- Display boot loader version

[InayathUlla Sharieff]

Hi,

No need to do it via xmodem. Please follow the below link to get the switch back online:

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_55_se/commmand/reference/bootldr.html

REgards

Inayath.

*Plz rate if this info is helpfull.

[choywy]

Hi,

I read thru' the doc...But which command say that it can do TFTP transfer? Thanks..

[Leo Laohoo]

Recovering Catalyst Fixed Configuration Switches from a Corrupted or Missing Image

[choywy]

I want to do it using TFTP....Able to do it?

[Leo Laohoo]

Yes, you need a TFTP to copy the BIN file into the switch via ROMmon.

[choywy]

Thanks..Which command in the siwtch rommon do that?

[Leo Laohoo]

Which command in the siwtch rommon do that?

Did you read the link I've posted?

[choywy]

I read.....I only mention about xmodem method....It didn't mention TFTP.....

[InayathUlla Sharieff]

Below links help you with all the possibilities:

1-

http://www.cisco.com/en/US/products/hw/switches/ps628/products_tech_note09186a0080169696.shtml

Let's go to rommon mode first.

2-

Here's the procedure to copy your IOS software via ROMmon:

Step-by-Step Recovery Procedure

http://www.cisco.com/en/US/products/hw/switches/ps628/products_tech_note09186a0080169696.shtml#topic2

3-

Here is the procedure to copy from xmodem

http://www.youtube.com/watch?v=DunSgaMvb0E&feature=youtu.be

4-

Recovering Catalyst Fixed Configuration Switches from a Corrupted or Missing Image

http://www.cisco.com/en/US/products/hw/switches/ps628/products_tech_note09186a0080169696.shtml

HTH

REgards

Inayath.

[choywy]

It all talk about xmodem transfer....I want TFTP transfer...Can this be done?

[Leo Laohoo]

It all talk about xmodem transfer....I want TFTP transfer...Can this be done?

Read this well.

You WILL NOT be able to do a faster TFTP transfer from ROMmon.  Only when you get the switch to run on IOS will you get TFTP transfer.

Another thing ... You can INCREASE the speed of the XModem.   If you took the time to read the link I've posted, there's a section called "How to Speed Up Xmodem Recovery". 

[HW05194]

Thank You for the documentation it helped in my case! 

[Prasan Venky]

the method 'tftpdnld' is not available for this switch platform. As Mr.leo mentioned only possibility is XMODEM transfer.