Every SNMP v3 agent has an engine ID which serves as a unique identifier for the agent. The engine ID is used with a hashing function to generate keys for authentication and encryption of SNMP v3 messages.
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If you do not specify an engine ID, one is generated when you enable the standalone SNMP agent.
If you use ESXCLI commands through vCLI, you must supply connection options that specify the target host and login credentials. If you use ESXCLI commands directly on a host using the ESXi Shell, you can use the commands as given without specifying connection options. For more information on connection options see vSphere Command-Line Interface Concepts and Examples.
SNMP configuration for ESXi requires the ESXCLI command set. See Getting Started with vSphere Command-Line Interfaces for more information on how to access ESXCLI.
The id must be a hexadecimal string between 5 and 32 characters long.