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FS-8704-09 SNMP Driver Manual Page 15 of 39
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com
Tel: (408) 262 2299 Fax: (408) 262 9042 Toll Free: (888) 509 1970 email: support@fieldserver.com
Appendix A.1.3. Receiving SNMP Traps – Storing using a Lookup Table
Some devices send trap messages with the same OID’s irrespective of the causal events. The OID contents provide event specific
information such as event origin and state. Consider a trap containing 3 OID’s. One has an integer value (event state) and the other two
have strings reporting the event source. The SNMP driver is capable of using the two string OID’s to form a search string to search a
lookup table. The driver uses the index value associated with a matching entry to determine a Data Array location to store the event state.
Thus a single trap message can be used to populate a Data Array in such a way that the location in the DA indicates the event source and
the value found at that location indicates the event state.
Example:
In the trap below ;
• 1.3.6.1.4.1.290.1.0 contains the event state
• 1.3.6.1.4.1.290.2.0 contains the 1
st
part of identifier of the event source
• 1.3.6.1.4.1.290.3.0 contains the 2
nd
part of identifier of the event source
When configured correctly the driver will concatenate the values of the two source OID’s to form a search string for a lookup table. An
offset value extracted from a matching entry is used to determine the location to store the event state value.
The example below illustrates how to configure the FieldServer to achieve this:
Simple Network Management Protocol
Version: 1 (0)
Community: public
PDU type: TRAP-V1 (4)
Enterprise: 1.3.6.1.4.1.290 (SNMPv2-SMI::enterprises.290)
Agent address: 10.32.6.3 (10.32.6.3)
Trap type: ENTERPRISE SPECIFIC (6)
Specific trap type: 70000000
Timestamp: 0
Object identifier 1: 1.3.6.1.4.1.290.1.0 (SNMPv2-SMI::enterprises.290.1.0)
Value: INTEGER: 4
Object identifier 2: 1.3.6.1.4.1.290.2.0 (SNMPv2-SMI::enterprises.290.2.0)
Value: STRING: "CROSSTWN_KDA"
Object identifier 3: 1.3.6.1.4.1.290.3.0 (SNMPv2-SMI::enterprises.290.3.0)
Value: STRING: "EMS_84_900MHZ_RADIO_B"
Object identifier 4: 1.3.6.1.4.1.290.4.0 (SNMPv2-SMI::enterprises.290.4.0)
Value: STRING: "EMS 84 900MHZ RADIO B"
Object identifier 5: 1.3.6.1.4.1.290.5.0 (SNMPv2-SMI::enterprises.290.5.0)
Value: INTEGER: 0