4507r+e Adding switches - IOS Issues

[JES Holdings]

I have a 4507r+e switch as my core.  I am trying to add 1 3850 and a stack of 3650s.  The 4507 is running 15.1(1r)SG5, but the new switches are running 16.1.  When I connected everything, all of my VLANs shutdown.  I assume the issue is my newer switches are at too high level of firmware.  Should I upgrade my core to latest and be set?  Am I missing something else that I need to address?

[seoyou15es]

I am also facing this problem please help me if you get its solution.

[Leo Laohoo]

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@JES Holdings wrote:

When I connected everything, all of my VLANs shutdown.

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I do not understand this.  Please elaborate further.

[JES Holdings]

Every VLAN defined in my core switch shutdown.  When I ran show run, I could see them all with shutdown.  I disconnected the new switches and ran a no shut on each vLAN and everything came back up.