Use the following guidelines and suggested steps to help resolve Maximum Transition Unit (MTU) size warnings for the vCenter Server Appliance.
Condition:
After successful deployment and configuration of VCSA, a Maximum Transition Unit (MTU) size warning appears.
What it means:
The switch port was not configured with Jumbo frame and the configured maximum MTU size is less than 9000.
Corrective Action:
Set the switch port MTU size to 9000.