Community:SNMP
From Splunk Wiki
Index SNMP events with Splunk
The most effective way to index SNMP events is to use snmptrapd to write them to a file.
First, configure snmptrapd to a file on disk.
# touch /var/run/snmp-traps # snmptrapd -Lf /var/run/snmp-traps
Then, configure the Splunk Server to add the file as a data input.