下表列出了 IPFIX 信息元素定义。

384 | valueDistributionMethod | 描述了用于将组成流量中的计数器分配给关联范围（通常为模板）描述的汇总流量记录的方法。该方法被视为应用于引用的范围内符合以下条件的所有非关键信息元素：值分配是有效操作。如果 originalFlowsInitiated 和/或 originalFlowsCompleted 信息元素位于模板中，则它们不受该分配方法的限制，因为它们分别推断自己的分配方法。这旨在作为一组完整的可能值分配方法；其编码如下所示： +-------+-----------------------------------------------------------+ | 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 | 描述用于分配 Biflow 源和目标的方向分配方法。该信息元素可能位于流量数据记录中，或应用于使用 IPFIX 选项从导出过程或观察域导出的所有流量。如果该信息元素在流量记录中不存在或通过范围与 Biflow 相关联，则假定方向分配方法配置是在带外完成的。
注： 在使用 IPFIX 选项将该信息元素应用于观察域中或来自导出过程的所有流量时，必须可靠地发送该选项。如果无法可靠地进行传输（即，在使用 UDP 时），该信息元素必须位于每个流量记录中。
该字段可能会采用以下值： +-------+------------------+----------------------------------------+ | 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. | +-------+------------------+----------------------------------------+ |