The idea behind the vSphere Distributed Switch Health Check feature is to help VMware administrators identify mismatched VLAN configurations, mismatched MTU configurations, and mismatched NIC teaming policies --- all of which are common sources of connectivity issues.
Closely related to the health check functionality is a feature called vSphere Network Rollback. The purpose of the network rollback is to automatically protect environments against changes that would disconnect ESXi hosts from vCenter Server by rolling back changes if they are invalid. For example, changes to the speed or duplex setting of a physical NIC, updating teaming and failover policies for a switch that contains the ESXi host's management interface, or changing the IP settings of a host's management interface are all examples of changes that are validated when they occur. If the change would result in a loss of management connectivity to the host, the change is reverted --- or rolled back --- automatically.
Closely related to the health check functionality is a feature called vSphere Network Rollback. The purpose of the network rollback is to automatically protect environments against changes that would disconnect ESXi hosts from vCenter Server by rolling back changes if they are invalid. For example, changes to the speed or duplex setting of a physical NIC, updating teaming and failover policies for a switch that contains the ESXi host's management interface, or changing the IP settings of a host's management interface are all examples of changes that are validated when they occur. If the change would result in a loss of management connectivity to the host, the change is reverted --- or rolled back --- automatically.
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