I have 2 server 2016 Hyper-V servers.
Both servers have experienced issues where the Virtual Switches become corrupted after rebooting the Hyper-V host for windows updates.
By corruption, I mean the virtual machines still have some network connectivity but not all. They can see the internet but applications do not work properly, like Exchange, DC replication, SharePoint.
The only way to fix this is to move the VM's to a different virtual switch port, delete the original virtual switch port, re-create that same port, and then move the VM's back to that port.
This has happened on 2 Hyper-V servers with different hardware.
The most recent incidence also caused issues with a backup software program running on one of the Hyper-V hosts until it was rebooted, the host experienced the same symptoms as the VM's, even after the virtual switch was re-created until the reboot.
Is there any way to prevent this?