An administrator has enabled vSphere Distributed Switch Health Check. The hosts connected to that Distributed Switch all display an alert:
-vSphere Distributed Switch MTU supported status
-The administrator has all of the VMkernel ports MTU sizes set to 1600.
Which action will remedy this problem?
A. Configure the Distributed Switch to MTU 9100.
B. Disconnect and reconnect the physical network cable.
C. Configure the physical switch to MTU 1600.
D. Disable the Distributed Switch MTU.
My gut feeling also told me that answer C is correct. They need to match.
I have searched the web for extra info and i cannot find anything that claims that “vSphere Distributed Switch Health Check.” needs to be MTU 1600 or something. IN short, you can configure it yourself, but dvSwitch and physical switch need to match MTU size.
Correct is C, both (physical and virtual) sides have to match.
Explanation:
You can increase the MTU size up to 9000 bytes. Therefore, a MTU of 9100 is not supported. The MTU
configured in the VDS must match the physical switch configured MTU.
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.networking.doc/GUID-
53F968D9-2F91-41DA-B7B2-48394D997F2A.html