3850 stack bundle upgrade

[DraganSkundric87318]

hi,

I need to upgrade 3850 stack of two switchec in bundle mode. Can I upgrade one at the time, just to be sure that one member will work ok?

br

[balaji.bandi]

If this is a stack you need to Upgrade the stack as the best approach.

If you like to each one, split the stack and upgrade and join back. ( this required more downtime)

Make sure you read the release notes from what version your version vs the target version and understand any bugs.

Note: always offload current working config out of the box.

[Martin L]

you can just upgrade master switch, aka switch #1  then others will upgrade software from it;  We did it when replacing old with new and had to do upgrade.  I think it takes about 20 minutes and command is "software auto install" but check Cisco doc page for 3850s. we install and upgraded master switch; then turn on 2nd switch and issue software auto install command. Not sure if it is possible to accidentally downgrade master from 2nd one. 

Regards, ML
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[Leo Laohoo]

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@DraganSkundric87318 wrote:

I need to upgrade 3850 stack of two switches in bundle mode.

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What is the current version of the stack? 
What is the intended version to be upgraded to?

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@Martin L wrote:

command is "software auto install"

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This command is not going to support Bundle Mode.