Re: [netext] #12: missing considerations on how to maintain consistent forwarding policies

<pierrick.seite@orange.com> Thu, 14 February 2013 10:49 UTC

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From: <pierrick.seite@orange.com>
To: 'netext issue tracker' <trac+netext@trac.tools.ietf.org>, "draft-ietf-netext-pmipv6-flowmob@tools.ietf.org" <draft-ietf-netext-pmipv6-flowmob@tools.ietf.org>, "cjbc@it.uc3m.es" <cjbc@it.uc3m.es>
Thread-Topic: [netext] #12: missing considerations on how to maintain consistent forwarding policies
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Date: Thu, 14 Feb 2013 10:49:09 +0000
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Subject: Re: [netext] #12: missing considerations on how to maintain consistent forwarding policies
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Hi,

Clearly, I'm not suggesting to describe mechanism for policy alignment, let alone specifying MN-MAG signaling.

Annex giving example on what can be done with L2 signaling may help. However, I think, the draft should state simple and clear assumptions on mobility control to avoid ambiguity on policy alignment. Basically, I suggest to add the following assumption (at least for prefix sharing scenario):

The MN makes the final IP flow mobility decision, then the LMA follows that decision and update its forwarding state accordingly. Note that, It does not prevent network initiated mobility, the network still could trigger mobility on the MN side via out-of-band mechanisms (e.g. 3GPP/ANDSF sends updated routing policies to the MN)... Actually, I'm suggesting the following statement "the MN always makes the final decision"

Pierrick

> -----Message d'origine-----
> De : netext-bounces@ietf.org [mailto:netext-bounces@ietf.org] De la
> part de netext issue tracker
> Envoyé : mercredi 13 février 2013 19:25
> À : draft-ietf-netext-pmipv6-flowmob@tools.ietf.org; cjbc@it.uc3m.es
> Cc : netext@ietf.org
> Objet : Re: [netext] #12: missing considerations on how to maintain
> consistent forwarding policies
> 
> #12: missing considerations on how to maintain consistent forwarding
> policies
> 
> 
> Comment (by cjbc@it.uc3m.es):
> 
>  (apologies for not addressing this until now)
> 
>  I agree policy consistency is critical, and this is actually reflected
> in  the draft. However, since the charter does not allows any type of
> IP  signaling between the MAG and LMA, specifying any type of policy
> alignment  signaling as part of the document seems to be clearly out of
> the scope.
>  The consensus I got from the WG (based on current charter boundaries)
> was  to leave that unspecified, so it can be done using L2 signaling
> for  example (and be specified by other SDOs).
> 
>  Do you have any suggestion on how to give clues without specifying a
> solution in the document? Would it be enough to provide informative
> examples (e.g., conveying that info as part of L2 signaling)?
> 
> --
> -------------------------------------+---------------------------------
> -
> -------------------------------------+---
>  Reporter:                           |       Owner:  draft-ietf-netext-
>   pierrick.seite@orange.com          |  pmipv6-flowmob@tools.ietf.org
>      Type:  defect                   |      Status:  new
>  Priority:  major                    |   Milestone:
> Component:  pmipv6-flowmob           |     Version:
>  Severity:  Active WG Document       |  Resolution:
>  Keywords:                           |
> -------------------------------------+---------------------------------
> -
> -------------------------------------+---
> 
> Ticket URL:
> <https://trac.tools.ietf.org/wg/netext/trac/ticket/12#comment:1>
> netext <http://tools.ietf.org/netext/>
> 
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