Re: [IPFIX] draft-ietf-ipfix-protocol-rfc5101bis-03

Andrew, all,

There's a loophole in both definitions: if a collector receives data 
records with export time = T2, then a Template with export time = T1 
(where T1 <= T2), the Template applies to the previously-received data 
records. This could be due to UDP out of order, or delivery in different 
SCTP streams.

However when the collector receives data records at T1 it doesn't know 
that a template is coming at T2, so its behaviour is unclear, especially 
if it already has a template for those data records. That could be an 
earlier template which no longer applies.

So the definition might benefit from some words about reception order.

P.



On 04/12/12 18:22, Andrew Feren wrote:
> Hi All, Atsushi,
>
> On 11/25/2012 08:41 AM, ATSUSHI KOBAYASHI wrote:
>> Dear all, Nevil,
>>
>> I checked the draft, I found some comments and editorial issue.
>> Please see in-line.
>>
>> Regards, Atsushi
> [ snip ]
>> Comment#3:
>>
>> I could not understand the following paragraph. If you want to describe
>> another way, please explain it in more detail.
> I think Atsushi makes a good point here.
>>>     Put another way, a Template only describes Records contained in 
>>> IPFIX
>>>     Messages with the same Export Time as the IPFIX Message containing
>>>     Template Record, or a subsequent export time. Likewise, a Template
>>>     Withdrawal is only in effect for IPFIX Messages with the same 
>>> Export
>>>     Time as the Template Withdrawal, or a subsequent Export Time.
> Perhaps something like...
>
>    Put another way, a Template only describes Data Records contained
>    in IPFIX Messages with the an Export Time greater than or equal to
>    the Export Time of the IPFIX Message containing Template Record.
>    Or until a Template Withdrawal is received. Likewise, a Template
>    Withdrawal is only in effect for IPFIX Messages with the an Export
>    Time greater than or equal to the Export Time of the IPFIX Message
>    containing Template Withdrawal.  Or until a new Template with the
>    withdrawn Template ID is received.
>
> -Andrew
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