Cisco 3650 Stacking/SW version

Trying to stack 2 3650 switches and one member stuck in initializing, looks like IOS issue, seems they have different versions, but one seems way off and not sure if its reporting correctly?

*    1 52    WS-C3650-48PS      03.06.06E         cat3k_caa-universalk9 INSTALL

*    2 52    WS-C3650-48PS      16.3.5b           CAT3K_CAA-UNIVERSALK9 INSTALL


the second one is the one that will stay in initialization.  not sure how two switches purchased together could be that far off.
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leadthewayAsked:
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JustInCaseCommented:
To be able to stack devices IOS version must match on both devices. Copy IOS from one device to the other one, install it and you should be OK.
If you will use switch as tftp server it will take a long time to copy IOS, maybe it is better to go with flash drive option. :)

3650 IOS need to be preferred option, not just copied and then to issue boot system command (although boot system is still an option, but should be avoided).
You can upgrade to IOS XE 16 the first switch - so you can choose... ;)
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leadthewayAuthor Commented:
which IOS is newer?
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JustInCaseCommented:
IOS XE 16 is newer, but for you as an network engineer is more important what is difference between those two (are there new capabilities added), stability and if there is a some known bug that can affect production. In networking - stability, security are way much more important then being modern.

Check open caveats for IOS XE 16.3.x and open caveats for IOS XE 3.6.x and then make decision which one will you use.
;)
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