Configure
-> system -> snmp -> traps -> destination -> create
Test
[root@bigip:Active] config # logger -p local1.warning "Pool member 127.0.0.1:31337 monitor status down."
Verify
Check your trap receiver on how it interacts with the message(s) by the BigIP
Karim Vaes 
¿ And use command snmptrap for testing snmp communication ?