Re: [IPFIX] Unit of flowActiveTimeout

Dear Shingo,

The IE ID is <128, which indicates that this IE has been adopted from
NetFlow.v9. So, "second" seems to be historical.

At a moment, active/inactive timeout parameters in IPFIX-CONFIG have
unit "milliseconds":
http://tools.ietf.org/html/draft-ietf-ipfix-configuration-model-07#page-26

Probably, this should be changed to "seconds" for consistency with the
IPFIX-MIB?

Regards,
Gerhard

Shingo KASHIMA wrote:
> Dear all,
> 
> I have one question about unit of flowActiveTimeout.
> 
> According to RFC 5102, unit of flowActiveTimeout is second.
> Why IPFIX doesn't support a timer with a unit smaller than second, e.g.
> millisecond or microsecond ? I want to know a history of discussion.
> 
> ----
> 5.11.1.  flowActiveTimeout
> 
>    Description:
>       The number of seconds after which an active Flow is timed out
>       anyway, even if there is still a continuous flow of packets.
>    Abstract Data Type: unsigned16
>    ElementId: 36
>    Status: current
>    Units: seconds
> ---
> 
> On the other hand, IEs about flow timestamps and packet timestamps have
> various units e.g. second, millisecond, microsecond and nanosecond.
> ---
> flowStartSeconds
> flowEndSeconds
> flowStartMilliseconds
> flowEndMilliseconds
> flowStartMicroseconds
> flowEndMicroseconds
> flowStartNanoseconds
> flowEndNanoseconds
> flowStartDeltaMicroseconds
> flowEndDeltaMicroseconds
> systemInitTimeMilliseconds
> flowStartSysUpTime
> flowEndSysUpTime
> observationTimeSeconds
> observationTimeMilliseconds
> observationTimeMicroseconds
> observationTimeNanoseconds
> ---
> 
> Also PSAMP IEs about time-based sampling parameter support a unit of
> microsecond. 
> ---
> samplingTimeInterval
> samplingTimeSpace
> ---
> 
> Best regards.

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