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2960x Stack upgrade without losing redundancy

Looking for some feedback on the following scenario:

 

We have a two switch stack where each switch is connected to each of 2 firewalls so that if one firewall or one switch fails, we don't lose our connectivity to the other end of the link (a matching 2 switch stack with routers attached). What we would like to be able to do is upgrade code on one stack member at a time so that we don't lose the entire link. If I have read the documentation correctly, if we do this, the stack will come back up with a version mismatch and will attempt to then auto upgrade the other switch. What I'm wondering is how the individual switches function while there is a version mismatch. For example, we will have a portchannel setup with a link on each switch going to the other 2 switch stack on the other end. Will traffic continue to flow across the port channel correctly while the stack is in version mismatch? Also, will traffic still flow between member switches in the stack.

 

Hopefully somebody has a stack where they need at least one member to be up at all times. If there isn't a way to do this, we'll just set the switches up individually but the shared management is a nice feature that we would like to take advantage of if possible.

 

Any input is appreciated.

 

Thanks.

  • LAN Switching and Routing
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What we would like to be able

What we would like to be able to do is upgrade code on one stack member at a time so that we don't lose the entire link.

Not going to be possible.  You can manually reload the individual switch, however, a switch member won't join the stack if it has a different IOS version to the stack master.  

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