次の表に、IPFIX 情報要素の定義を示します。
| 384 | valueDistributionMethod | 関連フローから関連範囲（通常はテンプレート）によって説明された集約フロー レコードにカウンタを配布するために使用される方法の説明。この方法は、値の配布が有効な操作である参照範囲内のすべての非キー情報要素に適用されるものとみなされます。originalFlowsInitiated または originalFlowsCompleted 情報要素がテンプレートに表示されている場合、それらの要素はそれぞれ独自の配布方法を示すため、この配布方法の対象にはなりません。これは、可能な値の配布方法の完全なセットを対象としており、次のようにエンコードされます。 +-------+-----------------------------------------------------------+ | Value | Description | +-------+-----------------------------------------------------------+ | 0 | Unspecified: The counters for an Original Flow are | | | explicitly not distributed according to any other method | | | defined for this Information Element; use for arbitrary | | | distribution, or distribution algorithms not described by | | | any other codepoint. | | | --------------------------------------------------------- | | | | | 1 | Start Interval: The counters for an Original Flow are | | | added to the counters of the appropriate Aggregated Flow | | | containing the start time of the Original Flow. This | | | must be assumed the default if value distribution | | | information is not available at a Collecting Process for | | | an Aggregated Flow. | | | --------------------------------------------------------- | | | | | 2 | End Interval: The counters for an Original Flow are added | | | to the counters of the appropriate Aggregated Flow | | | containing the end time of the Original Flow. | | | --------------------------------------------------------- | | | | | 3 | Mid Interval: The counters for an Original Flow are added | | | to the counters of a single appropriate Aggregated Flow | | | containing some timestamp between start and end time of | | | the Original Flow. | | | --------------------------------------------------------- | | | | | 4 | Simple Uniform Distribution: Each counter for an Original | | | Flow is divided by the number of time intervals the | | | Original Flow covers (that is, of appropriate Aggregated | | | Flows sharing the same Flow Key), and this number is | | | added to each corresponding counter in each Aggregated | | | Flow. | | | --------------------------------------------------------- | | | | | 5 | Proportional Uniform Distribution: Each counter for an | | | Original Flow is divided by the number of time units the | | | Original Flow covers, to derive a mean count rate. This | | | mean count rate is then multiplied by the number of times | | | units in the intersection of the duration of the Original | | | Flow and the time interval of each Aggregated Flow. This | | | is like simple uniform distribution, but accounts for the | | | fractional portions of a time interval covered by an | | | Original Flow in the first- and last-time interval. | | | --------------------------------------------------------- | | | | | 6 | Simulated Process: Each counter of the Original Flow is | | | distributed among the intervals of the Aggregated Flows | | | according to some function the Intermediate Aggregation | | | Process uses based upon properties of Flows presumed to | | | be like the Original Flow. This is essentially an | | | assertion that the Intermediate Aggregation Process has | | | no direct packet timing information but is nevertheless | | | not using one of the other simpler distribution methods. | | | The Intermediate Aggregation Process specifically makes | | | no assertion as to the correctness of the simulation. | | | --------------------------------------------------------- | | | | | 7 | Direct: The Intermediate Aggregation Process has access | | | to the original packet timings from the packets making up | | | the Original Flow, and uses these to distribute or | | | recalculate the counters. | +-------+-----------------------------------------------------------+ |
| 239 | biflowDirection | Biflow の送信元と宛先を割り当てるために使用される方向割り当て方法の説明。この情報要素は、フロー データ レコードに存在するか、IPFIX オプションを使用してエクスポート プロセスまたは観測ドメインからエクスポートされたすべてのフローに適用されます。この情報要素がフロー レコードに存在しないか、範囲を介して Biflow に関連付けられていない場合、方向割り当て方法の設定は帯域外で行われると見なされます。
注： IPFIX オプションを使用してこの情報要素を観測ドメイン内またはエクスポート プロセスのすべてのフローに適用する場合、オプションを確実に送信する必要があります。信頼性の高いトランスポートが利用できない場合（つまり、UDP を使用している場合）、この情報要素が各フロー レコードに表示されている必要があります。
このフィールドには、次の値を指定できます。 +-------+------------------+----------------------------------------+ | Value | Name | Description | +-------+------------------+----------------------------------------+ | 0x00 | arbitrary | Direction is assigned arbitrarily. | | 0x01 | initiator | The Biflow Source is the flow | | | | initiator, as determined by the | | | | Metering Process' best effort to | | | | detect the initiator. | | 0x02 | reverseInitiator | The Biflow Destination is the flow | | | | initiator, as determined by the | | | | Metering Process' best effort to | | | | detect the initiator. This value is | | | | provided for the convenience of | | | | Exporting Processes to revise an | | | | initiator estimate without re-encoding | | | | the Biflow Record. | | 0x03 | perimeter | The Biflow Source is the endpoint | | | | outside of a defined perimeter. The | | | | perimeter's definition is implicit in | | | | the set of Biflow Source and Biflow | | | | Destination addresses exported in the | | | | Biflow Records. | +-------+------------------+----------------------------------------+ |
