Re: [IPFIX] IPFIX length fields

Hi, Paul, Nick,

It appears that "quantity" is applied a little haphazardly (indeed, "observationTime*" has quantity semantics which doesn't seen quite right), but that none of the IEs with explicit quantity semantics is a length. 

So in the interests of "make things internally consistent", I'd say that these should be changed to no semantics.

Does this indicate a need to clarify the applicability of quantity vs no semantics in 5102bis?

Cheers,

Brian



On Mar 2, 2012, at 12:07 AM, Paul Aitken wrote:

> Dear all,
> 
> Reviewing IANA's IPFIX field list, we noticed that most of the *length fields have no semantics.
> 
> However, mplsTopLabelPrefixLength has semantics of "identifier", while ethernetHeaderLength, ethernetPayloadLength, ethernetTotalLength have semantics of "identifier".
> 
> We propose that these all be changed to no semantics.
> 
> Or better, that all lengths be changed to semantics of "quantity", since RFC5102 says,
> 3.2.1.  quantity
> 
>    A quantity value represents a discrete measured value pertaining to
>    the record.  This is distinguished from counters that represent an
>    ongoing measured value whose "odometer" reading is captured as part
>    of a given record.  
> If no semantic qualifier is given, the
>    Information Elements that have an integral data type should behave as
>    a quantity.
> 
> 
> Feedback?
> 
> Thanks,
> Paul and Nick
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