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3750E IOS code upgrade BOOTLDR question

I have a question regarding the BOOTLDR on a a 3750E switch. I upgraded the IOS code on a 3750 switch from 12.2 (53r) SE2 to 12.2 (55) SE5.

A show version shows :BOOTLDR: C3750e Boot Loader (C3750X-HBOOT-M) Version 12.2 (53r) SE2.

Why isn't the BOOTLDR indicating the upgraded IOS code (12.2 (55) SE5) instead?

Is this a problem?



Everyone's tags (5)

Re: 3750E IOS code upgrade BOOTLDR question

Greetings Jose,

The boot loader is a separate software component to IOS. You should refer to the line which begins 'Cisco IOS Software' to determine which IOS release is in use, example from my lab:

Cisco IOS Software, C3750 Software (C3750-IPBASE-M), Version 12.2(25)SEE2, RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2006 by Cisco Systems, Inc.

Compiled Fri 28-Jul-06 08:46 by yenanh

Image text-base: 0x00003000, data-base: 0x00EE3E54

ROM: Bootstrap program is C3750 boot loader

BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE (fc1)

12.2(25)SEE2 is the IOS version. 12.2(44)SE5 is the boot loader version.

Some (but not all) IOS releases include a boot loader upgrade which is automatically installed when the image is first booted. That is why in the output above the boot loader version has a higher maintenance revision than the IOS image, because at some point in the past it was running a newer release and the boot loader was upgraded.

It is expected that the boot loader and IOS version strings differ and this is not something you should be concerned about or need to manage.

Kind Regards,


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