The following commands can be used to configure Mikrotik routers to send Netflow v9 data to a collector. First, turn on the Traffic Flow feature and specify an interface to monitor flows on.
/ip traffic-flow set enabled=yes interfaces=ether1
The example above tells the router to collect flow information for ether1, but could be easily extended with a comma-separated list of interfaces.
Next specify the flow collectors and ports to report flow data to.
/ip traffic-flow target add dst-address=192.168.90.195 port=9995 version=9
In this case we're using Netflow v9, on port 9995, with the flow collection server at 192.168.90.195. Multiple targets (collectors) can be specified, using different Netflow versions and ports.