Add a new 2960X with different IOS version but same stack protocol version to existing stack

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01-23-2019 03:51 AM - edited 03-08-2019 05:07 PM
I need to add one new 2960x switch to an existing production stack of 2960x. existing stack has got different IOS than new switch ,but stack protocol version (maj.min) looks the same. do I need to upgrade the IOS or will it work with different IOS if I add to existing stack , please help
Existing Stack
===========
System image file is "flash:/c2960x-universalk9-mz.150-2a.EX5.bin"
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 52 WS-C2960X-48FPS-L 15.0(2a)EX5 C2960X-UNIVERSALK9-M
2 52 WS-C2960X-48FPS-L 15.0(2a)EX5 C2960X-UNIVERSALK9-M
3 28 WS-C2960X-24PS-L 15.0(2a)EX5 C2960X-UNIVERSALK9-M
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01-23-2019 03:55 AM
shanilkumar2003,
Yes, the requirement is to have all the stack members on the same version of IOS code.

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01-23-2019 03:58 AM - edited 01-23-2019 04:01 AM
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01-23-2019 04:01 AM
You have two choices here: either to downgrade the new member's IOS version to what is running on the stack or to upgrade the stack version and connect the new member.
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01-23-2019 04:00 AM - edited 01-23-2019 04:10 AM
Hi there,
Take a look at the command: boot auto-copy-sw
...this should copy the current stack image to the newly joining member.
In reality I have never seen this work correctly, so I always configure the new switch with the same images that is running on the stack it is about to join.
Cheers,
Seb.
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01-23-2019 04:05 AM
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01-23-2019 04:36 AM
It is good practice to have them match exactly though for feature capability
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01-23-2019 04:39 AM
1. Make new switch iOS same as stack iOS
2. Make new switch stack priority lowest
3. When connecting new switch in stack make sure it is power off , then do stack cabling , once cabling is complete poweron the new switch.
