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IOS on Cisco 3750V2

A new Cisco 3750V2 (WS-C3750V2-48PS-S) running IOS 'c3750-ipbasek9-mz.122-50.SE5.bin' waspurchased to add to a stack of 3 Cisco 3750 (WS-C3750-48PS-S) switches. The IOS on the stacked switches is 'c3750-ipbase-mz.122-25.SEB4.bin'.

I loaded this IOS on to the new Cisco 3750V2 and deleted its original IOS. Boot up failed with error 'hardware not supported by firmware'. I am now trying to follow the recovery procedure but the I can only initialise the flash (flash_init) and there is no 'boot_helper' command to load the boot helper files. There is no option to rum 'copy xmodem' so I cannot upload the original IOS image via xmodem on hyperterminal.

Everyone's tags (2)
8 REPLIES
New Member

IOS on Cisco 3750V2

I think the command you're looking for is load_helper and not boot_helper, see link below:

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

New Member

IOS on Cisco 3750V2

Dear Will,

Sorry it is a mistake I meant to write 'load_helper'. There is no load_helper command.

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

switch: load_helper
Unknown cmd: load_helper

switch:

New Member

IOS on Cisco 3750V2

Can you post the output from when you enter the flash_init command.

New Member

IOS on Cisco 3750V2

On switches its "load_helper"......Follow th procedure inthe below URL -

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

Btw, 3750 V2 needs minimum of 12.2.50SE release.

New Member

IOS on Cisco 3750V2

Sorry it is a mistake I meant to write 'load_helper'. There is no load_helper command.

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

switch: load_helper
Unknown cmd: load_helper

switch:

New Member

IOS on Cisco 3750V2

Try this:

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

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_50_se/configuration/guide/scg.html

You could also try and delete the 12.2(25) image

New Member

IOS on Cisco 3750V2

Dont worry  about the load_helper command. Intialise the flash with flash_init,  skip the load_helper, follow the procedure with xmodem command.

New Member

Re: IOS on Cisco 3750V2

I realise that this thread is really old but just in case someone else stumbles over it....

The command line during recovery is very specific and doesn't like anything missing or out of place.

So if you issue the command:     copy xmodem flash

You will receive an error, in order to get it to start awaiting xmodem transfer, issue the command as follows:

     copy xmodem: flash:

[i.e. you must include the colons after the text xmodem and flash (it will start without the colon after flash but later error as it will try to write to a filesystem called flash as opposed to flash: also if you omit the filename it will again error later) ]

Then the switch will await you initiating the xmodem transfer from your terminal client.

Also to speed up the transfer you can up the BAUD speed, for example to 115200 to do this use:

     set BAUD 115200

Then change your terminal clients BAUD to match and you should achieve more rapid transfer speeds. You can then later return and remove that setting with:

    unset BAUD

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