Re: [IPFIX] new monitoring interval information elements

Paul,

Please check if the proposed IEs are compatible with 
ipfixMeteringProcessCacheDiscontinuityTime in IPFIX-MIB and 
cacheDiscontinuityTime in IPFIX-CONFIG.

Parameters which exist in IPFIX-MIB, IPFIX-CONFIG and as IE should 
follow the same naming scheme and semantic, if possible.

Thanks,
Gerhard


On 16.06.2012 16:56, Paul Aitken wrote:
> Dear IPFIX experts,
>
> FYI, I'm requesting two new IPFIX Information Elements from IANA to
> record the start and end of a monitoring interval, which is a period of
> time during which the Metering Process is running.
>
> The existing IPFIX Information Elements provide flow based timestamps,
> system init, and observation times. There's no indication of the
> Metering Process, whichmay be running for a period of time during which
> no flows of interest or relevanceare observed.
>
> In fact, many existing elements are described as "The total number of X
> since the Metering Process (re-)initialization". However, there's
> currently no indication of when that (re-)initialization was. These new
> Information Elements enable an IPFIX device to indicate when the
> Metering Process started and ended.
>
> These new elements are particularly useful when the Metering Process is
> windowed - ie, it runs for a fixed interval, exporting all its
> observations only at the end of that interval, before optionally
> starting over. With these new Information Elements, an IPFIX device can
> readily indicate the start (and end) of each interval.
>
> Our present need is only for milliseconds resolution. At this time we
> don't need the equivalent seconds, microseconds, or nanoseconds
> elements, although these could be created in future if needs be.
>
> Also note the subtle distinction between "monitoring" and "metering": a
> device could be monitoring traffic for some time, without detecting
> anything of interest or relevance to be metered. The metering interval
> could almost be expressed by minFlowStart* to maxFlowEnd*. We've chosen
> to name these elements "monitoring interval" rather than "metering
> interval" to clearly express this difference.
>
>
> Name:         monitoringIntervalStartMilliSeconds
> Data Type:    dateTimeMilliseconds
> Sematics:     -
> Description: The absolute timestamp at which the monitoring interval
> started.
>                 A Monitoring interval is the period of time during which
> the Metering Process is running.
> Units:        milliseconds
>
>
> Name:         monitoringIntervalEndMilliSeconds
> Data Type:    dateTimeMilliseconds
> Sematics:     -
> Description: The absolute timestamp at which the monitoring interval ended.
>                 A Monitoring interval is the period of time during which
> the Metering Process is running.
> Units:        milliseconds
>
>
> Thanks,
> P.
>
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