When you configure the SNMP agent for SNMP v3, the agent supports sending traps. SNMP v3 also provides stronger security than v1 or v2c, including cryptographic authentication and encryption.
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In vSphere 6.0, SNMP v3 informs are not supported. The vCenter Server Appliance supports only notifications such as v1/v2c traps and v3 traps with all security levels.