Hi. You need to install the SNMP addon and you will have all you need to listen for traps or do bulk requests.
Addon : https://splunkbase.splunk.com/app/1537/
After installation the option is available under Settings -> Data Inputs -> SNMP
Thanks for your response,
Is this app certified or supported by Splunk?
No information is provided, so i can assume the community support's this application.