This object indicates the media rate used by the flow monitor
to compute the DF for the traffic flow. If the corresponding
instance of cfmMdiMetricsCfgRateType is 'auto', then the value
of this column indicates the MR for the traffic flow during the
measurement interval. Otherwise, the value of this column
reflects the configure MR.
The value of this column is valid if and only if the 'mediaRate'
bit in the corresponding instance of cfmMdiMetricsIntValid is
set to '1'.