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stack of 5 7750s in the core - high cpu after Aruba controller upgrades

New Contributor III


Have a customer where we recently upgraded their core stack of 5 x 7750 to 8095f, no issues there, running smoothly. 

Customer then upgraded their pair of Aruba controllers from to and now the CPUs of the 7750 stack are hitting 99% utilisation. 

I am trying to debug this and wondering what could have caused this. We unplug the aruba controllers, CPU returns to normal...

I have a show CPU log before and after, some dm commands and a tech-support 

Any thoughts on how to troubleshoot this to see what is causing the spike?