SNMP outgoing traps are connection-less. There is no way for the system to know if a trap receiver is down, the box just sends a UDP packet out, and forgets about it. It is up to the network to deliver the UDP packet to the destination, and there will be no retransmission as with TCP. I am not sure the IP address ordering logic, but yes, if you have multiple IP addresses as trap receivers, for each trap, it will go to each IP address at the same time.
