You can perform Fortiswitch 500 (IPFIX) configuration using the following steps:
configure terminal sflow
sflow collector {NETFLOW_SERVER_IP} udp-port {NETFLOW_SERVER_LISTENER_PORT}
Enter global configuration mode on the router or MSFC, and issue the following commands for each interface on which you want to enable flow:
config
ipfix collector {NETFLOW_SERVER_IP} port {NETFLOW_SERVER_LISTENER_PORT} all