Re: [netext] AD Evaluation: draft-ietf-netext-pmip-cp-up-separation
"Sri Gundavelli (sgundave)" <sgundave@cisco.com> Wed, 18 June 2014 14:30 UTC
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From: "Sri Gundavelli (sgundave)" <sgundave@cisco.com>
To: "Sri Gundavelli (sgundave)" <sgundave@cisco.com>, Brian Haberman <brian@innovationslab.net>, "draft-ietf-netext-pmip-cp-up-separation@tools.ietf.org" <draft-ietf-netext-pmip-cp-up-separation@tools.ietf.org>, "netext@ietf.org" <netext@ietf.org>
Thread-Topic: [netext] AD Evaluation: draft-ietf-netext-pmip-cp-up-separation
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Date: Wed, 18 Jun 2014 14:30:14 +0000
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Subject: Re: [netext] AD Evaluation: draft-ietf-netext-pmip-cp-up-separation
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Hi Brian, We just posted -04 version. It includes the changes that we discussed. Regards Sri On 5/27/14 12:00 PM, "Sri Gundavelli (sgundave)" <sgundave@cisco.com> wrote: >Thanks Brian. We will post the revised I-D. > >Regards >Sri > > > >On 5/27/14 11:58 AM, "Brian Haberman" <brian@innovationslab.net> wrote: > >>Sri, >> I believe your proposed changes help clarify the text. Go ahead >>and submit an update with all the changes discussed. >> >>Regards, >>Brian >> >> >>On 5/27/14 1:05 PM, Sri Gundavelli (sgundave) wrote: >>> Hi Brian, >>> >>> Sorry for the delay. Please see inline. >>> >>> >>> On 5/22/14 4:57 AM, "Brian Haberman" <brian@innovationslab.net> wrote: >>> >>>> Hi Sri, >>>> >>>>>> >>>>>> 2. What is the plan for the publication of the CP separation >>>>>> requirements document that is referenced in this document? It seems >>>>>> rather silly to publish the solution spec before the requirements. >>>>>> Should they advance together? Incorporate the requirements into >>>>>>this >>>>>> document? >>>>> >>>>> >>>>> >>>>> We have the following text that talks about the assumptions around >>>>>this >>>>> interface. The draft is primarily driving this definition for the >>>>> deployment-scenario where the CP and DP functions exist on the same >>>>>IP >>>>> node. Figure-1 reflects this. However, the draft does not disallow >>>>>the >>>>> separation of CP and DP functions across different IP nodes. That's >>>>> surely >>>>> the goal here. But, there is no desire to mandate one specific >>>>>interface >>>>> between CP and DP entities. That interface may emerge as a generic >>>>> interface and this draft (PMIP-split-CP-DP) being one of the >>>>> applications >>>>> leveraging that interface. The interface can be based on OpenFlow, >>>>> FORCES, >>>>> some vendor specific interface, or the referenced draft based on >>>>> extensions to routing control plane. There is no dependency on one >>>>> specific interface for realizing the CP/DP split per this spec. Most >>>>> likely vendors may not agree on a single interface between a >>>>>controller >>>>> and a data plane node and so we tried to stay neutral on that aspect. >>>>> >>>>> >>>>> >>>>> --- >>>>> Section 1: >>>>> >>>>> Note that the interface between the control and user plane is out >>>>>of >>>>> scope in this document. It is required to setup a data path on >>>>>the >>>>> user plane according to the control signaling on the control >>>>>plane. >>>>> Several IETF working groups are addressing this interface as >>>>> described in [RFC5415], [RFC5812], [RFC5810], >>>>> [I-D.matsushima-stateless-uplane-vepc]. Techniques from Software >>>>> Defined Networking (SDN) [RFC7149] may also be applied. >>>>> >>>> >>>> The above makes sense and would be a good addition to the draft, but I >>>> am still a little concerned with the text surrounding the reference to >>>> draft-wakikawa-req-mobile-cp-separation. I think that it is the >>>>wording: >>>> >>>> >>>> This separation brings more flexible deployment and management of LMA >>>> and MAG(s) of Proxy Mobile IP as described in >>>> [I-D.wakikawa-req-mobile-cp-separation]. To meet this requirement... >>>> >>>> >>>> Should I parse this as the reference to the draft is only to relate >>>>the >>>> use cases rather than the actual requirements? If so, I could change >>>> "To meet this requirement" to "To facilitate this approach" or >>>>something >>>> similar. >>> >>> >>> Reference to I-D.matsushima is intended to be an example. >>> >>> >>> How about the following text: >>> >>> OLD: >>> Note that the interface between the control and user plane is out of >>> scope in this document. It is required to setup a data path on the >>> user plane according to the control signaling on the control plane. >>> Several IETF working groups are addressing this interface as >>> described in [RFC5415], [RFC5812], [RFC5810], >>> [I-D.matsushima-stateless-uplane-vepc]. Techniques from Software >>> Defined Networking (SDN) [RFC7149] may also be applied. >>> >>> >>> >>> NEW: >>> >>> The LMA-CP and the LMA-DP functions are typically deployed on the same >>>IP >>> node and in such scenario the interface between these functions is >>> internal to the implementation. Deployments may also choose to split >>>the >>> LMA-CP and the LMA-DP functions across IP nodes. In such deployment >>> models, there needs to be a protocol interface between the LMA-CP and >>>the >>> LMA-DP functions and which is outside the scope of this document. >>>Possible >>> options for such interface include OpenFlow [Ref-1], FORCES [Ref-2], >>>use >>> of routing infrastructure [I-D.matsushima-stateless-uplane-vepc] or >>>vendor >>> specific approaches. This specification does not mandate a approach, or >>>a >>> specific protocol interface and views this interface as a generic >>> interface relevant more broadly for other protocol systems as well (Ex: >>> IPSec, L2TP, Mobile IPv6). >>> >>> >>> >>> Regards >>> Sri >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >>>> >>>> Or am I missing something? >>>> >>>> Regards, >>>> Brian >>>> >> > >_______________________________________________ >netext mailing list >netext@ietf.org >https://www.ietf.org/mailman/listinfo/netext
- [netext] AD Evaluation: draft-ietf-netext-pmip-cp… Brian Haberman
- Re: [netext] AD Evaluation: draft-ietf-netext-pmi… Sri Gundavelli (sgundave)
- Re: [netext] AD Evaluation: draft-ietf-netext-pmi… Brian Haberman
- Re: [netext] AD Evaluation: draft-ietf-netext-pmi… Sri Gundavelli (sgundave)
- Re: [netext] AD Evaluation: draft-ietf-netext-pmi… Brian Haberman
- Re: [netext] AD Evaluation: draft-ietf-netext-pmi… Sri Gundavelli (sgundave)
- Re: [netext] AD Evaluation: draft-ietf-netext-pmi… Sri Gundavelli (sgundave)