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The Engine ID concept was introduced in the SNMPv3. FortiGate follows the concept and, by default, sends an Engine ID for each SNMP agent.
By default, each vendor has a unique series of numbers at the start of engine IDs to identify their products. Fortinet has a unique number series 8000304404 at the start of the Engine ID for its devices.
When it comes to FortiGate, by default, the hex version of each device's serial number is concatenated after the unique numbers to form the Engine ID.
For example, A FortiGate has a serial number FG121GTK25004672. When it is converted to Hex format, the output is 46 47 31 32 31 47 54 4b 32 35 30 30 34 36 37 32.
After concatenating the unique identifier with the above output, the Engine ID comes out to be: '8000304404464731323147544b3235303034363732'.
This is the unique engine ID for the respective FortiGate device, which will be used to identify it uniquely on an SNMP manager tool.
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