Re: [netext] [Fwd: I-D Action: draft-ietf-netext-pmipv6-flowmob-09.txt]

<pierrick.seite@orange.com> Wed, 02 July 2014 13:37 UTC

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From: <pierrick.seite@orange.com>
To: "cjbc@it.uc3m.es" <cjbc@it.uc3m.es>, Hidetoshi Yokota <yokotah@gmail.com>
Thread-Topic: [netext] [Fwd: I-D Action: draft-ietf-netext-pmipv6-flowmob-09.txt]
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Date: Wed, 2 Jul 2014 13:37:18 +0000
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Subject: Re: [netext] [Fwd: I-D Action: draft-ietf-netext-pmipv6-flowmob-09.txt]
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Hi,

Just a minor comment:

The acknowledgement section states that this work has been partially funded by the European Community via a research project. Is such statement acceptable for an IETF document? Shoudn't we remove this ack?

Pierrick

>-----Message d'origine-----
>De : Carlos Jesús Bernardos Cano [mailto:cjbc@it.uc3m.es]
>Envoyé : mercredi 2 juillet 2014 02:38
>À : Hidetoshi Yokota
>Cc : Sri Gundavelli; SEITE Pierrick IMT/OLN; netext@ietf.org
>Objet : Re: [netext] [Fwd: I-D Action: draft-ietf-netext-pmipv6-flowmob-
>09.txt]
>
>Hi Hidetoshi,
>
>Thanks again for your comments. Please see inline below some
>comments/replies from my side:
>
>On Sun, 2014-06-29 at 22:32 +0900, Hidetoshi Yokota wrote:
>> Hi Carlos,
>>
>> I briefly reviewed the updated draft and have a couple of comments.
>>
>> o The messages named as FMI/FMA in this document are actually
>UPN/UPA,
>> so the description is confusing since it looks as if new messages were
>> defined. I would propose a new flag or notification reason/status code
>> to indicate that UPN/UPA are used for flow mobility.
>
>The use of FMI/FMA is simply to make clearer that these UPN/UPA messages
>are for flow mobility purposes. New notification reason codes are actually
>defined in the document for this purpose.
>
>>
>> o In the previous version, FMI could convey the Flow ID mobility
>> option, but the latest version can convey only HNPs. This looks like a
>> degradation and I'm not sure how both LMA and MAG can share the same
>> flow mobility cache.
>
>With the UPN/UPA signaling option, the document has never supported
>conveying the Flow ID mobility option. Ensuring that both the LMA and MAG
>keep the same flow mobility cache was out of the scope of the document. If
>the WG agrees, we could add the possibility of supporting UPN/UPA
>(FMI/FMA) optionally conveying the Flow ID mobility option. What do other
>people think?
>
>>
>> o The flow mobility operation such as "add" or "remove" should be able
>> to specify the targeted flow. To this end, the Flow ID mobility option
>> in RFC6089 should be used. The flow binding action sub-option defined
>> in
>> RFC7109 can be used for the flow mobility operation.
>
>In the current version "add" and "remove" are performed with prefix
>granularity (as I mentioned in a previous e-mail, this was the consensus
>reached some time ago, but we can revisit this if the WG wants to do so).
>
>Thanks!
>
>Carlos
>
>>
>> Please take these points into consideration.
>>
>> Regards,
>> --
>> Hidetoshi
>>
>> (2014/06/26 7:05), Carlos Jesús Bernardos Cano wrote:
>> > Hi,
>> >
>> > I've just posted -10, now including only one single signaling
>> > mechanisms, as discussed on the ML.
>> >
>> > I think this version is ready for WGLC.
>> >
>> > Carlos
>> >
>> > On Thu, 2014-06-19 at 18:09 +0000, Sri Gundavelli (sgundave) wrote:
>> >> Hi Carlos/All,
>> >>
>> >>
>> >> Can we plan to close this work in the next few days. AFAIK, this
>> >> FMI/FMA issue is now resolved. If you still doubt the consensus on
>> >> this issue, we can wait for 2 days for any comments and post the
>> >> next rev.
>> >>
>> >>
>> >> I'm hoping we will close this work this week and go LC on Monday
>> >> (if chairs agree). Waiting for Toronto meeting can delay the work
>> >> by another few months.
>> >>
>> >>
>> >>
>> >>
>> >> Regards
>> >> Sri
>> >>
>> >>
>> >> From: Sri Gundavelli <sgundave@cisco.com>
>> >> Date: Thursday, June 19, 2014 6:46 AM
>> >> To: "pierrick.seite@orange.com" <pierrick.seite@orange.com>om>,
>> >> Hidetoshi Yokota <yokota@kddilabs.jp>jp>, "netext@ietf.org"
>> >> <netext@ietf.org>
>> >> Subject: Re: [netext] [Fwd: I-D Action:
>> >> draft-ietf-netext-pmipv6-flowmob-09.txt]
>> >>
>> >>
>> >>
>> >> Hi Pierrick,
>> >>
>> >>
>> >> After the NETEXT meeting in London, we had some offline discussions
>> >> with Rajiv and folks. There is agreement to use the RFC-7077 (UPN)
>> >> messaging format for FMI/FMA. So, the Flow Mobility spec may refer
>> >> to this message as FMI/FMA, but the underneath messaging format
>> >> will confirm to RFC-7077 format and will have references to
>> >> RFC-7077. We are not going to define a new MH message. This closes
>> >> the key issue of using two notification approaches in the same
>> >> spec. AFAIK, no one has any objection to this. If any does, its now
>> >> time to speak up :)
>> >>
>> >>
>> >> Regards
>> >> Sri
>> >>
>> >>
>> >>
>> >>
>> >> From: "pierrick.seite@orange.com" <pierrick.seite@orange.com>
>> >> Date: Thursday, June 19, 2014 1:32 AM
>> >> To: Hidetoshi Yokota <yokota@kddilabs.jp>jp>, "netext@ietf.org"
>> >> <netext@ietf.org>
>> >> Subject: Re: [netext] [Fwd: I-D Action:
>> >> draft-ietf-netext-pmipv6-flowmob-09.txt]
>> >>
>> >>
>> >>
>> >> Hi Hidetoshi/all,
>> >>
>> >>
>> >>
>> >> Release -08 mandates RFC7077 and the doc was good, IMHO. But, in
>> >> London, we have decided (group consensus) to reintroduce FMI/FMA to
>> >> avoid dependency between RFC. Now, it’s true that introducing 2
>> >> options for message format makes the solution more complex for
>> >> little added-value (no major differences between messages)… So,
>> >> maybe the question is “is it good or bad to have RFC dependency?”
>> >> then update the draft according the answer...
>> >>
>> >>
>> >>
>> >> Pierrick
>> >>
>> >>
>> >>
>> >> De : netext [mailto:netext-bounces@ietf.org] De la part de
>> >> Hidetoshi Yokota Envoyé : jeudi 19 juin 2014 06:41 À :
>> >> netext@ietf.org Objet : Re: [netext] [Fwd: I-D Action:
>> >> draft-ietf-netext-pmipv6-flowmob-09.txt]
>> >>
>> >>
>> >>
>> >>
>> >> Hello Carlos,
>> >>
>> >> Thanks for updating the draft.
>> >> I have a couple of questions and comments:
>> >>
>> >> o In Section 3.2.1, which is the shared prefix case, there is no
>> >> message exchange between the LMA and MAG, so there is no flow
>> >> information on the MAG side. It should work in the sense of
>> >> routing, but if, for example, each flow has a specific QoS, the MAG
>> >> should also need to know which flow should go on which QoS path
>> >> especially for upstream traffic towards the LMA. Or, the MAG may
>> >> want to send a trigger for flow mobility to the MN (the exact
>> >> mechanism is out of scope).  Some mobility signaling should be there,
>too.
>> >>
>> >> o In Section 3.3, FMI/FMA are revived considering the case where
>> >> UPN is not supported, but they convey very little information.
>> >> There is no special information that cannot be conveyed by the existing
>messages.
>> >> Since RFC7077 is now a proposed standard, I cannot think of a
>> >> situation where the UPN/UPA are not supported, nevertheless
>FMI/FMA
>> >> are supported. It rather seems more natural to mandate the support
>> >> of
>> >> RFC7077 or to mandate FMI/FMA for all flow mobility operations.
>> >> Also, when compared with UPN/UPA case in Figure 4, FMI/FMA seem to
>> >> convey different set of parameters in Figure 7. Could you clarify
>> >> it a little bit more please?
>> >>
>> >> o In Section 3.3, just above Figure 7, there is a description:
>> >> "..., and the type of flow mobility operation (add flow)", but does
>> >> RFC6089 define such an operation code? This kind of operation
>> >> should also be defined in the draft.
>> >>
>> >> Regards,
>> >>
>> >>
>> >>
>> >> --
>> >> Hidetoshi Yokota
>> >>
>> >> KDDI R&D Laboratories, Inc.
>> >> e-mail:yokota@kddilabs.jp
>> >>
>> >>
>> >>
>> >> (2014/06/14 2:16), Carlos Jesús Bernardos Cano wrote:
>> >>
>> >>
>> >>          Hi,
>> >>
>> >>          As agreed in London, I've updated the flow mobility draft to include
>> >>          also the FMI/FMA signaling option (in addition to the use of Update
>> >>          Notifications). The draft also includes a mechanism to allow selecting
>> >>          which one of the two signaling mechanisms to use.
>> >>
>> >>          In my personal opinion, it'd be much cleaner and simpler to just
>specify
>> >>          one signaling mechanism, but this is up to the WG to decide.
>> >>
>> >>          Comments, reviews and discussion on this new revision would be
>welcome.
>> >>          Hopefully we could get at least a new revision before Toronto.
>> >>
>> >>          Thanks,
>> >>
>> >>          Carlos
>> >>
>> >>
>> >>
>> >>
>> >>          _______________________________________________
>> >>          netext mailing list
>> >>          netext@ietf.org
>> >>          https://www.ietf.org/mailman/listinfo/netext
>> >>
>> >>
>> >>
>> >>
>> >>
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