What is the cause of thisissue?

A customer is troubleshooting QoS in a Cisco UCS domain due to high packet drops in the network. The
customer has configured the vNIC and associated QoSpolicy, and changed the MTU from 1000 to 1200.
Packet drops still exist. What is the cause of thisissue?

A.
The MTU specified here must be greater than the MTU specified in the associated QoS system class. If
this MTU value is less than the MTU value in the QoS system class, packets may be dropped during data
transmission.

B.
The MTU specified here must be equal to or less than the MTU specified in the associated QoS system
class. If this MTU value exceeds the MTU value in the QoS system class, packets may be dropped during
data transmission.

C.
The MTU specified here must be less than the MTU specified in the associated QoS system policy. If this
MTU value exceeds the MTU value in the QoS system policy, packets may be not be dropped during data
transmission.

D.
The MTU must be optimized and should be changed to fc with the CLI command set mtu fc.