top of rack proxmox netapps

Hi, We are using 2 Cisco 9500 for a Top of Rack Solution for Proxmox and Netapps. The proxmox is connected to the Netapps via LACP bonding on the 2 9500 Cisco switches. When I do an upgrade on the two 9500 switches I am using the ISSU method with 5 second outage. This outage causing massive...