Stack switch reboot

Unanswered Question
Dec 18th, 2009


Let say, I have two switch stack (3750).  Can I upgrade and reboot one switch at a time?  Thank you.

I have this problem too.
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Reza Sharifi Fri, 12/18/2009 - 09:42


You can use reload slot stack-member-number to reset the stack member.

but, you should always use the same IOS version for the entire stack

form the config guide:

All stack members must run the same Cisco IOS software version to ensure compatibility in the stack protocol version among the members

Here is more info:

Use a Tar file to upgrade the entire stack and reboot.



pmpesha Fri, 12/18/2009 - 09:58

Thanks Reza, I already know the basics of stacks witches.  What I usually do, is upgrade with tar file and then reboot the entire stack.  I will test the reload slot stack id command in the lab to verify how effective it is.  All I want to do, after downloading and extracting the tar file, is to reboot the primary switch, and once that is up, proceed with rebooting the secondary.  I know after rebooting the primary, we will have two versions of IOS, will this be an issue before I reboot the secondary?  Thank you.

Reza Sharifi Fri, 12/18/2009 - 10:12

Then, you will have 2 different versions of IOS  and Switches with different major version numbers are incompatible and cannot exist in the same stack.

Also, switches with the same major version number but with a different minor version number as the master are considered partially compatible. When connected to a stack, a partially compatible switch enters version-mismatch mode and cannot join the stack as a fully functioning member.



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