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New Member

cisco 3750 switches IOS

I want to upgraded my Cisco 3750 switches. The  current IOS is flash:c3750-ipbase-mz.122-35.SE5/c3750-ipbase-mz.122-35.SE5.bin

What is the latest IOS version I can use for these switches?  This versions is the latest on the cisco download site. Is is ok to upgrade to this version or do I do I need to upgrade starting with a lower version progressing upward??? Thanks


Hall of Fame Super Gold

Regardless if you have 16 or

Regardless if you have 16 or 32 mb flash storage, use IOS version 12.2(55)SE9 for 3750-series family of switches.

New Member

Hi Leo,We just bought 3 x new

Hi Leo,

We just bought 3 x new 3750x-48Ps to replace our old stack 3x 3750-48s.

What is the best way to migrate the 3 x old stacks ( consist of 2 x 48 ports + 1 x  24ports) to

a new stack of 3 x 48 ports switches.

Much appreciated




Hall of Fame Super Gold

This is what I would normally

This is what I would normally do if I need to replace a stack member and, as much as possible, LESS configuration.  


In your case, let us say I've got three switches in a stack.  The replacement switches are running the same IOS as the current switches.   Switch #1 is the stack master.


1.   Remove the configuration of stack #3 and add the new switch as stack member 3.  

config t
no switch 3 provisioning [BLAH]
switch 3 provisioning [BLAH]

2.  Power down existing switch #3 and remove both stacking cable from switch #3.  

3.  DO NOT POWER UP the new switch. 

4.  Cable up the new switch #3. 

NOTE:  Somewhere here, you can pre-configure the ports to the new switch #3. 

5.  Power up the new switch #3 and observe the stack joining process.


If everything goes well, repeat the process from 1 to 5 for Switch #2 and Switch #1.  

New Member

Hi Leo,Thank you for your

Hi Leo,

Thank you for your valuable suggestion.

However since the 3 switches are in the production and the rack are quite full and have 

an hour windows to replace them.

I was thinking of doing a TFTP config of the old stack and upload the config to the new 

stack setup in the test bench and when the time come shutdown & unmounted the old stack and replaced with the new ones.

Would this approach work ?

Please advise



Hall of Fame Super Gold

Yes.  This would work and you

Yes.  This would work and you'll need to build the new stack off-line.


But this will work.

New Member

The stacks are a bit

The stacks are a bit different.

old one : 24 ports Master  + 48 + 48 ports

new one : 48 ports master + 48  + 48 ports

when i do tftp old config to the new stack , only the first 24 ports config come across ie a bit odd .

have to manually copy the rest of 2 x 48 ports config across!!!


Hi Hugh, This one is updated

Hi Hugh,


This one is updated as the latest IOS in Cisco Site


c3750-ipbasek9-mz.122-55.SE9.bin - Release Date 18th March 2014. DRAM/Flash: 128/16




New Member



New Member

Thanks for clarifying. I

Thanks for clarifying. I upgraded to c3750-ipbaselmk9-tar.122-55.SE9.tar