Switch in stack not coming up

[jasongr33nway]

Hello all. I have an issue. IOS image was applied to the master switch and on reload the master switch will not come back up. I know the issue is the other two switches in the stack have an older IOS than the master. I disconnected the master from the stack and it still will not come back up. Is my only option to console on, and reboot off the older IOS?

[brselzer]

Hello,

What model switch is it? What version are you moving from and going to? There is a chance that the switch is dropping to rommon. You might need to console in and check what is going on when it tries to boot. 

[jasongr33nway]

2960x in a stack with a couple 2960s. IOS is 15.0(2)EX4 and loaded is 15.5(3)M7

[brselzer]

Sounds like you might be using the wrong version. 15.5(3)M7 is a router IOS. A 2960s or 2960x switch can not run that. You could run something like 15.2(2)E8 if you wanted a newer version. You can see all compatible versions on the download page:

2960S:

https://software.cisco.com/download/release.html?mdfid=282864093&flowid=46690&softwareid=280805680&release=15.0.2-SE11&relind=AVAILABLE&rellifecycle=MD&reltype=latest

2960X:

https://software.cisco.com/download/release.html?mdfid=284795753&flowid=43251&softwareid=280805680&release=15.2.2E7&relind=AVAILABLE&rellifecycle=MD&reltype=latest

Hope that helps. Thanks!

[jasongr33nway]

Sorry, you're right. It's 15.2(2)E7 not 15.5(3)M7

[brselzer]

I see. Do you know what filename you used? There are 2960s images and 2960x images and they are different. I imagine at this point you will need console access to the switch to see what is going on. Feel free to post any errors you are getting and I will take a look. 

[jasongr33nway]

I figured out what is wrong. The hostname was 2960s and it is actually a 2960x. I put the S image on it.

[Leo Laohoo]

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@jasongr33nway wrote:

Sorry, you're right. It's 15.2(2)E7 not 15.5(3)M7

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Did you reboot the stack or did you manually power reload the stack?  

I am asking because there is a microcode bug affecting EX train.  When an IOS upgrade occurs and the switch is running an EX, a manual reload is required because there is a bug with the microcode.  When the bug kicks in, the switch will boot into ROMmon. 

A complete power down is required.

[jasongr33nway]

Got everything back up and working this morning. Thanks for your help!