IOS upgrade of 3750-stacked switch

Unanswered Question
Jun 4th, 2008

Hi All,

We are having the 3750-stacked switch & it needs to be upgraded.

Our problem, if something goes wrong while upgrading what is the procedure for

reverting it.

Or is it possible to break the stack & then upgrade & after upgrade & again put them under stack.

Need procedure or suggestion,Please help.

Thanking all


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Mark Yeates Wed, 06/04/2008 - 16:50


Here is a guide that has all the answers to your questions.

Upgrading the stack

Troubleshooting the stack

If you have any other questions feel free to ask.


ralphcarter Wed, 06/04/2008 - 18:58


The most easiest way to upgrade the stack is through Cisco Network Assistant CNA software that comes free with the 3750's. You can download it through Cisco Website.

You need the .tar images and can upgrade all switches easily in 1 shot.

You need to allow HTTP access to the switch:

# ip http server

# ip http authentication local

navin_rk3 Mon, 06/09/2008 - 18:23

Hi All,

I do know the upgrading the ios from cli mode & i prefer.

Please any one guide me on downgrading ,when the uploading file gets corrupted.



Mark Yeates Mon, 06/09/2008 - 18:53

Downgrading requires the same process. Be aware that downgrading may cause configuration issues dependant on version/feature set.


navin_rk3 Wed, 06/11/2008 - 15:44

Please someone confirm me ,that this command is helpfull in downgrading the IOS

delete /force /recursive flash:c3750-ipbase-mz.122-35.SE5

glen.grant Wed, 06/11/2008 - 15:53

delete /force /recursive flash:c3750-ipbase-mz.122-35.SE5 , the only thing that does is delete a image "directory" and everything in it if you need to add space for new images .

Mark Yeates Wed, 06/11/2008 - 15:58

That will only delete the current IOS that you are using. You will need to copy the new IOS via TFTP, and reboot to take affect.


navin_rk3 Sat, 06/14/2008 - 21:13

Appreciate the response for my problem.

I need a clarification on...

1) Can i upgrade from c3750-ipbase-mz.122-25.SEE2.bin to c3750-ipbasek9-mz.12.2-25.SEE4 or c3750-ipbasek9-mz.12.2-44.SE2 ,which one is compatable.

2) If i upgrade to c3750-ipbasek9-mz.12.2-25.SEE4 ,while upgrading if my image gets corrrupted then what is the procedure to downgrade (not xmodem method).

Please suggest.



Mark Yeates Sun, 06/15/2008 - 15:45

1:) You can upgrade to either release that you desire, and suits your needs best. The 12.2-44.SE2 has many added features since the 12.2-25 releases. I don't see any compatibility issues that you might incur

2:)Yes you can Xmodem to load an image if it fails, but I wouldn't count on that happening. Unfortunately TFTP is not supported in the 3750 Rommon mode.


navin_rk3 Sun, 06/15/2008 - 18:01

Hi Mark,

Could you ,please tell me the downgrade method.It will be very helpfull.



Mark Yeates Sun, 06/15/2008 - 18:07

There is no different method to downgrading. It is the same all around the board. The only problem that you might face is that you could be using a feature that is not supported by the downgraded release. The switch will boot whichever IOS that you have installed and that you have configured to boot.

MUHAMMAD SHAHEEN Mon, 06/16/2008 - 01:44


Make sure to backup the current config and current IOS to TFTP server. Then upgrade with the new IOS and reboot. If there are new features then Switch will read and update the Running-config by loading the startup-config. And I suggest you should do copy running-config to startup-config at this point. This will make the startup-config compatible with the new IOS.

In worst case if you hit any problem and you need to go back to the previous setup then remove new IOS and load the old one from the tftp. Then delete the startup-config and load the backup-config from the tftp.

I personally like to use CNA when upgrading IOS to the Switches as it is much easier to perform upgrades and it updates boot variables accordingly. I do prefer to use Telnet when configuring the Cisco kit. But it is your own choice.

please do let us know how did it go

Hope this Helps


navin_rk3 Mon, 06/30/2008 - 15:58

Hi All,

I tried upgrading the IOS through the TFTP but it is alaways giving a error "error reading the tftp://" & lastly it says less less memory.

I had pasted the dir of both the flashes

Master#dir flash1:

Directory of flash1:/

2 -rwx 27 Jun 24 2008 19:21:32 +05:30 private-config.text

3 -rwx 5976 Jun 24 2008 19:21:32 +05:30 config.text

4 -rwx 736 Mar 1 1993 06:25:56 +05:30 vlan.dat

5 drwx 192 Mar 1 1993 05:36:08 +05:30 c3750-ipbase-mz.122-25.SEE


15998976 bytes total (7201792 bytes free)

Master#dir flash2:

Directory of flash:/

2 -rwx 27 Jun 24 2008 19:21:32 +05:30 private-config.text

4 -rwx 736 Mar 1 1993 05:30:57 +05:30 vlan.dat

5 drwx 192 Mar 1 1993 05:35:59 +05:30 c3750-ipbase-mz.122-25.SEE


458 -rwx 5976 Jun 24 2008 19:21:32 +05:30 config.text

15998976 bytes total (7201792 bytes free)

Master#sh memory

Head Total(b) Used(b) Free(b) Lowest(b) Largest(b)

Processor 1DC3A08 90686968 24867892 65819076 63750420 63537528

I/O 7400000 12574720 8419648 4155072 3878744 4112152

Could somebody suggest me that shall i go for upgrading the switch through ROMMOn method & i doesn't know the procedure to go ahead.

Please suggest.

Mark Yeates Mon, 06/30/2008 - 17:08

The problem is that you don't have enough free space for both images. You have a few choices to make this work. You can delete via the CLI the existing IOS with the .bin file, or using the .tar file you can use the /overwrite command to remove the old image.


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