There are two documentation topics that might help:
http://docs.splunk.com/Documentation/Splunk/latest/Data/SendSNMPeventstoSplunk
http://docs.splunk.com/Documentation/Splunk/latest/Admin/SendSNMPtrapstoothersystems
There are two documentation topics that might help:
http://docs.splunk.com/Documentation/Splunk/latest/Data/SendSNMPeventstoSplunk
http://docs.splunk.com/Documentation/Splunk/latest/Admin/SendSNMPtrapstoothersystems