Version 8.1.1.0 Introduced on the E-Series ExaScale.
Version 7.7.1.0 Introduced on the S-Series.
Version 7.6.1.0 Introduced on the C-Series.
Version 6.2.1.1 Introduced on the E-Series.
Usage 
Information
The dropEvent counter (sFlow samples dropped due to sub-sampling) shown in the Example 
below always displays a value of zero.
Example
FTOS#show sflow linecard 1
Linecard 1
  Samples rcvd from h/w             :165
  Samples dropped for sub-sampling  :0
  Total UDP packets exported        :0
  UDP packets exported via RPM      :77
  UDP packets dropped               :
FTOS#
1360