 In addition, OpenNMS can receive events in the form of SNMP Traps, syslog messages, TL/1 events or custom messages sent as XML to port 5817.Events can be configured to generate alarms.While events represent a history of information from the network, alarms can be used to create correlation workflow (resolving "down" alarms when matching "up" alarms are created) and performing "event reduction" by representing multiple, identical events as a single alarm with a counter.