SNMP version 3 (RFC 2570 through 2575) introduces a User-Based Security model (RFC 2574) for authentication and privacy services. This model provides a user that is associated with security information for authentication of its generated SNMP messages.
SNMP version 3 also supports View-Based Access Control Mechanism (RFC 2575) to control access at the PDU level. It defines mechanisms for determining whether to allow access to a managed object in a local MIB by a remote principal. You can create and associate SNMPv3 users with configured SNMP groups to use the group views for access control.