Trap Event

Fired when a SNMP trap packet is received.

Object Oriented Interface

public function fireTrap($param);

Procedural Interface

ipworkssnmp_snmptrapmgr_register_callback($res, 11, array($this, 'fireTrap'));

Parameter List



The TrapOID and TimeStamp parameters contain the Trap OID and TimeStamp. In the case of an SNMPv1 trap, there are two possible scenarios:

First, if the enterprise of the trap is "", TrapOID will be a concatenation of TrapEnterprise and GenericTrap + 1. For instance a TrapOID of "" has a TrapEnterprise of "" and a GenericTrap of "4".

Second, In all other cases TrapOID will be a concatenation of the values for TrapEnterprise, GenericTrap, and SpecificTrap, separated by '.'.

For SNMPv2 and above, they are read from the variable-value list (if available).

For SNMPv3, the User parameter shows the user that was supplied with the packet. This parameter MUST be used together with the SecurityLevel parameter which shows the level of security in the message.

The SecurityLevel parameter shows whether the request has been authenticated. If SecurityLevel is 0, the request has NOT been authenticated (i.e. the packet signature has not been verified). For an authenticated, non encrypted request, SecurityLevel is 1. For an authenticated and encrypted request, SecurityLevel is 2.

The list of variables in the SNMP packet, including optional values and types, is provided through the Objects collection. Each object is of type snmpobject. This type describes the ObjId, ObjType, and ObjValue of each SNMP object. These variables must be copied to another location before the event has completed executing, or they may be overridden by other events.

The SourceAddress and SourcePort parameters show the address and port of the sender as reported by the TCP/IP stack.

Some parameters are only applicable depending on the SNMPVersion value. The table below shows which parameters are applicable to which SNMP versions.

AgentAddress X
Community X X
RequestId X X
SecurityLevel X
User X
SNMPVersion X X X
SourceAddress X X X
SourcePort X X X
TimeStamp X X X

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IPWorks SNMP 2020 PHP Edition - Version 20.0 [Build 7941]