Switch stacks on different firmware

[Gumby]

Hi,

What is the best process for upgrading a switch stack so servers with multiple links don't drop connection.  With the scheduling tool can you stagger it so each switch is upgraded independent or is the stack going to have issues with different firmware?  In this instance only going from 9.34 to 9.36 but what about between major versions?

I've read that the stack shouldn't reset all switches at once but feedback seems to be that this doesn't always occur.

[PhilipDAth]

+1. I would like to know this as well.

I have only done between minor versions.  I would plan for a full system outage to go to a major version.

[ww]

I guess its best to contact meraki support and let them upgrade each switch in the stack so you can make sure your lacp channel is back up before upgrading the next switch.

[MilesMeraki]

I'm not sure myself, would love to know. @MerakiDave, @DCooper any chance you know?

[redsector]

Support put me a new menu on the dashboard, so I can update switch for switch, the name of this is "staged upgrades". I did updates with that. It´s working with switches in a stack too.

[Gumby]

To follow up, have done a staged upgrade on a 3 switch stack, 1 switch per hour.  Gone through no problems on this minor update.

Agree with Phil though on the major update and how well the stacking interface would hold up given the amount of stacking bugs there are (and fixes).

[Zedilt]

This might solve your problem..

https://documentation.meraki.com/MS/Other_Topics/Staged_Upgrades_for_Meraki_Switches