trap-source

I am looking for a way to do cause all SNMP traps generated by my device (running net-SNMP) to use a specific IP address as the trap source in the trap message. 
 
This can be done on a Cisco IOS device using the command SNMP-server trap-source hostname.
 
I need to do this because my device has many interfaces defined and if I don't do it, it will be difficult to tell what device is sending the trap.
 
Thanks in Advance
Mark