Zabbix SNMP trapper reads and parses the trap file.SNMPTT or Perl trap receiver parses, formats, and writes the trap to a file.snmptrapd passes the trap to SNMPTT or calls Perl trap receiver.Receiving SNMP traps in Zabbix is designed to work with snmptrapd and one of the built-in mechanisms for passing the traps to Zabbix - either a Perl script or SNMPTT.
Using traps may detect some short problems that occur amidst the query interval and may be missed by the query data. Usually, traps are sent upon some condition change and the agent connects to the server on port 162 (as opposed to port 161 on the agent side that is used for queries). In this case, the information is sent from an SNMP-enabled device and is collected or "trapped" by Zabbix. Receiving SNMP traps is the opposite to querying SNMP-enabled devices.
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