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Beginner

How to upgrade a stack without downtime?

Hi,

 

I have a stack of 3850-switches and want to upgrade the switches in the stack by using Cisco Prime. Is it possible to do the upgrade so that one switch is upgraded first and rebooted, and so that the next switch is upgraded when the first is online again?

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VIP Mentor

Personally i stay away from PI upgrade process, rather i do it manually.

 

You can't upgrade non-disruptive way because a switch has to reboot.  Any clients connected to that physical switch will loose connection unless the client has dual NICs going to two different switch in a stack.

 

Unfortunately you will need to reboot after the upgrade. So there is no way you can do it non disruptively..

good post will help you

 

https://community.cisco.com/t5/switching/3850-stack-ios-upgrade/td-p/2348956

 

Notes :

1. Make you have backup config, and do the upgrade process in maintenance window.

2. read the release notes before upgrading and understand the risk.

BB
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Hall of Fame Community Legend

1. 3850 doesn't support Rolling Stack Upgrade (what you've described above);
2. Don't risk it: Do the upgrade yourself and don't let PI do it.
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