Re: [IPFIX] WG: I-D Action: draft-ietf-ipfix-flow-selection-tech-06.txt

Hi, Benoit,

I disagree, I think, for two reasons.

First, if IE3 is defined with parallel semantics to IE1 and IE2 (octet and packet delta count), it should provide _delta_ count, not _total_ count, semantics (i.e., subsequent exports are a delta from last export, not a replacement value).

Second, this is an IE with a much more restricted semantic meaning; it refers to Flow Entries (a new bit of flow selection terminology, the difference between which and "Flow" and "Flow Record" is still a bit unclear to me) that are given as _input_ to a (undefined but I presume contextually resolvable) Flow Selection Process. 

This is somewhat different than the Flow analog of Packet and Octet Delta Count.

(However, if IE3 was _not_ defined by Cisco with this in mind, and really means "the total number of flows seen at the (Metering Process or analogue) _before_ flow processing", objection withdrawn.)

Best regards,

Brian

On May 27, 2011, at 12:38 PM, Benoit Claise wrote:

> Dear Tanja,
> 
> One quick remark (a thorough review should follow) regarding this I.E.
> 
> 7.5.  fsFlowEntryTotalCount
> 
>   Description:
> 
>      This Information Element specifies the current number of all Flow
>      Entries that form the parent population as input to the Flow
>      Selection Process.
> 
>   Abstract Data Type: unsigned64
> 
>   ElementId: TBD5
> 
>   Status: Proposed
> 
>   Units: Flow Entries
> 
> 
> In Cisco, years ago, we have defined the I.E. #3 with the same concept. It is used when we do router-based aggregation, which is exported with NetFlow version 8. It represents the number of flow that we're given as input to the router-based aggregation process.
> See http://www.cisco.com/en/US/technologies/tk648/tk362/technologies_white_paper09186a00800a3db9_ps6601_Products_White_Paper.html (which btw, we're busy updating)
> 
> So this TBD5 should be 3.  Does it make sense?
> 
> Regards, Benoit.
>> Hi all,
>> 
>> we worked on a major revision of the flow selection draft and just submitted a new version (see below). Among other changes we now provide a much improved classification of methods, which is more consistent with the PSAMP packet selection documents.
>> Many thanks to all who provided comments.
>> 
>> Changes:
>>  - Flow recording process removed
>>  - Clarification of difference between flow selection and packet selection
>>  - Distinguished flow filtering and flow sampling similar to PSAMP
>>  - Flow selection in the metering process either before aggregation or after aggregation
>>  - Integrated Flow-state dependent packet selection
>>  - Supporting arbitrary  key space subsets with property match flow filtering
>>  - Removed timestamp IEs for reporting
>>  - Mediator integrated in first picture
>>  - Configuration parameters and IEs redefined and re-named
>>  - Many rewording, shortened several paragraphs to improve readability
>> 
>> Kind regards
>> Tanja
>> 
>> 
>> -----Ursprüngliche Nachricht-----
>> Von: ipfix-bounces@ietf.org [mailto:ipfix-bounces@ietf.org] Im Auftrag von internet-drafts@ietf.org
>> Gesendet: Montag, 23. Mai 2011 11:21
>> An: i-d-announce@ietf.org
>> Cc: ipfix@ietf.org
>> Betreff: [IPFIX] I-D Action: draft-ietf-ipfix-flow-selection-tech-06.txt
>> 
>> A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the IP Flow Information Export Working Group of the IETF.
>> 
>> 	Title           : Flow Selection Techniques
>> 	Author(s)       : Salvatore D&#39;Antonio
>>                           Tanja Zseby
>>                           Christian Henke
>>                           Lorenzo Peluso
>> 	Filename        : draft-ietf-ipfix-flow-selection-tech-06.txt
>> 	Pages           : 25
>> 	Date            : 2011-05-23
>> 
>>    Flow selection is the process of selecting a subset of flows from all
>>    flows observed at an observation point.  Flow selection reduces the
>>    effort of post-processing flow data and transferring flow records.
>>    This document describes motivations for flow selection and presents
>>    flow selection techniques.  It provides an information model for
>>    configuring flow selection techniques and discusses what information
>>    about a flow selection process should be exported.
>> 
>> 
>> 
>> A URL for this Internet-Draft is:
>> http://www.ietf.org/internet-drafts/draft-ietf-ipfix-flow-selection-tech-06.txt
>> 
>> Internet-Drafts are also available by anonymous FTP at:
>> ftp://ftp.ietf.org/internet-drafts/
>> 
>> This Internet-Draft can be retrieved at:
>> ftp://ftp.ietf.org/internet-drafts/draft-ietf-ipfix-flow-selection-tech-06.txt
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