You can perform Dell Switch Ex4200 (sFlow) configuration using the following steps:
edit protocols sflow
set collector {NETFLOW_SERVER_IP}
Set collector udp-port {NETFLOW_SERVER_LISTENER_PORT}
set polling-interval 60
set sample-rate 1000
Enter global configuration mode on the router or MSFC, and issue the following commands for each interface on which you want to enable flow:
set interfaces {INTERFACE_NAME}