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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 5 
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

interfaces {                            
    ge-0/0/0 {                          
        unit 0 {                        
            family inet {               
                sampling {              
                    input;              
                    output;  
                    
forwarding-options {                    
    sampling {                          
        input {                         
            rate 100;     
####   This means 1 in every 100 packets is sampled  DO NOT reduce this to 1 unless the router is very lightly loaded.                 
        }                               
        family inet {                   
            output {                    
                flow-server 192.168.1.1 {
                    port 12345;         
                    version 5; 
###  Version 5 is simplest but only supports IPV4      
                }                       
            }                           
        }                               
    }                                   
}