VMware NSX 4.x
Log in to NSX Manager UI → System → Profiles → Node Profiles.
Under SNMP polling, click Add SNMP Profile.
Select SNMP v3, then set:
Username
Auth password
Priv password
Save, then assign the profile to target nodes/edges.
Commit changes.
For details related to configuring/upgrading SNMP via NSX manager CLI, refer to: Simple Network Management Protocol (SNMP)
For details related to configuring a node profile, refer to Configure a Node Profile.