Contemporary Control Systems Compact Managed Switches Software Manual for Web Browser - Manual (Page 77)

TD020851-0MG
77
5.2.6.2 Traps for SNMPv1
5.2.6.2.1 Format of Trap Messages
Each trap message contains a header and a protocol data unit (PDU).
5.2.6.2.2 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 5.2.6.2.3 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 50 — Format of the Trap Message for SNMP Version 1