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! this command is optional, this will flow data about in-progress flows, very handy for large file transfers.
ip flow-cache timeout active 1
! version can be 5 or 9 with 9 add IPV4 template
ip flow-export version 95 
ip flow-export destination <opflow_server> 12345
!
interface FastEthernet0/0
 !only if you want output traffic
 ip flow ingress
 !only if you want input traffic
 ip flow egress