Contemporary Control Systems Compact Managed Switches Software Manual for Console Access - Manual (Page 79)

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5.1.6.2 Traps for SNMPv1
5.1.6.2.1 Format of Trap Messages
Each trap message contains a header and a protocol data unit (PDU).
5.1.6.2.2 Trap Header
The fields in the trap message header contain :
Version — 0, indicating SNMP version 1.
Community string — the community string, which authorizes NMS access to the
Trap Protocol
Data Unit (PDU)
The fields in the PDU contain :
PDU type — 4 (indicates version 1 trap PDU)
Enterprise — Identifies the type of managed object generating the trap. For switch traps, the
value is as follows :
Generic Trap — value is SNMP (1.3.6.1.2.1.11)
Agent-address — the IP address of the originating agent.
Generic-trap — 0 to 6, indicating the generic trap type. See Section 5.1.6.2.3 for descriptions
of the generic-trap types.
Specific-trap — indicates the specific trap type. This field is only interpreted when the generic
trap type is 6, enterpriseSpecific.
Time-stamp — seconds since last power cycle.
Variable bindings — one or more OIDs (object identifiers) paired with the corresponding
values. A variable is an instance of a managed object. These pairings provide more
information about the event.
Figure 56 —Format of the Trap Message for SNMP Version 1