The agent supports multiple versions of the SNMP protocol as follows:
SNMP Version 1 (SNMPv1) is the original Internet-standard network management framework.
SNMPv1 uses a community string match for authentication.
The implementation uses SNMPv2c, the community-based administrative framework for SNMPv2. SNMPv2c uses a community string match for authentication.
In SNMP Version 3 (SNMPv3), USM defines the user authentication and encryption features. View Access Control MIB (VACM) defines the user access control features. The SNMP-COMMUNITY-MIB is used to associate SNMPv1/SNMPv2c community strings with SNMPv3 VACM access control.
SNMPv3 uses a username match for authentication.