Network health protection allows you to configure a virtual machine so that if its connection to an external network configured for protection is lost, the virtual machine is automatically live-migrated to a new host where that protected external virtual network is available. For example, if the network adapter connecting a virtual machine to the Internet fails and the external virtual network associated with that adapter is configured as protected, then the virtual machine will automatically live-migrate to a host where the external virtual network still retains connectivity. Network health protection requires multiple network paths between
cluster nodes. This feature is new to Windows Server 2012 R2 and is not available in Windows Server 2012.