RSPAN

I have a 4 managed fortiswitch. An would like to sniff some ports on sw1, some on sw2 and mirror that to a specific port on sw3. From the documentation I can sniff base on mac address or ip address. It not workin, what is wrong in my config? also do I need to set VLAN 4092 on both port as tag?

Here is my config:

config switch-controller traffic-sniffer set mode rspan config target-mac edit mm:mm:mm:xx:xx:xx set description device-to-sniff end config target-port edit S248EPTFXXXXXXXX set description where-to-send-data set in-ports port38 set out-ports port38 end end