Re: [netext] draft-ietf-netext-redirect-10
<Basavaraj.Patil@nokia.com> Tue, 06 September 2011 21:37 UTC
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From: Basavaraj.Patil@nokia.com
To: jouni.nospam@gmail.com, netext@ietf.org
Thread-Topic: [netext] draft-ietf-netext-redirect-10
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Date: Tue, 06 Sep 2011 21:39:12 +0000
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Subject: Re: [netext] draft-ietf-netext-redirect-10
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Thanks Jouni for bringing these clarifications to the attention of the WG. I have no specific comments or suggestions regarding the proposed changes. Please note that there will not be any additional WG last call to this I-D as a result of these changes. -Raj On 9/5/11 1:56 AM, "ext jouni korhonen" <jouni.nospam@gmail.com> wrote: >Folks, > >Based on implementation experience we felt there really is a need to >shape up few places in the draft-ietf-netext-redirect-09 and also fix >some overlooked details. This is done with a knowledge of our AD. See >recently posted draft-ietf-netext-redirect-10 for exact text >changes/modifications. > >First, a bunch of clarifications: > >o In section 1 the text is slightly modified to clarify that AAA/DNS >support > is not needed for the initial discovery & selection of the (rf)LMA. Once > the MAG learns a number of r2LMAs it does not actually need to contact >the > rfLMA every time thus bypassing the rfLMA as soon and often as possible. > >o In Section 1 we also clarified that all MAGs and LMAs that can do > "redirection" have to belong to the same PMIP6 domain. > >o In Section 4 we remind that all values and numbers are actually in >network > byte order. > >o in Section 4.2 it was clarified (or rephrased actually) that the >Redirect > option in a PBA contains IPv6 address of the r2LMA when the >corresponding > PBU source IP address was IPv6 address. And the same for IPv4 as well. > >o In multiple places we included a reference to RFC5844 just to remind >that > the solution is also applicable when IPv4-HoA and/or IPv4 transport is > used. > >o Figure 1 was modified so that MAG-rfLMA and rfLMA-r2LMA steps are > actually logically separate independent whether the rfLMA and r2LMA are > collocated or separate. > >o In Section 5.2 we emphasize that MAG must ignore unsolicited Redirect > option and continue PBA processing as described in RFC5213. > >o In Section 5.2 we added a mention of tunnel creation and a reference to > MAG tunnel creation procedures in RFC5213. > >o In Section 5.3.1 we added Figure 2 to show an example signaling in case > of 'collocated rfLMA and r2LMA'. > >o In Section 5.3.2 we added Figure 3 to show an example signaling in case > of 'separate rfLMA (proxy-MAG) and r2LMA'. > >o In Section 5.3.2 we clarify what addresses go into PBUs/PBAs. > >o Section 6 is renamed to "Handoff and Multi-Homing Considerations" as it > is about both, not just about multi-homing. > >o In Section 7 we state that for a rfLMA most of the RFC5213 configuration > objects do not apply when an LMA is in rfLMA role. > >Second, an enhancement to distribute load information around which helps >MAGs and proxy-MAGs to select r2LMAs. This is to make the solution more >standalone and not to mandate an introduction of some "load distribution" >protocol as a part of the package: > >o Section 4.3 introduces a new Load Information mobility option that > contains basic key performance indicators of r2LMAs for MAGs to check > the load of the box and possibly prioritize them based on that > information. The use of option is optional. > >Third, fixes to flaws & found issues: > >o In Section 5.3.1 the reference to LMA tunnel creation procedures into > RFC5213 was actually pointing to MAG procedures. > >o Since -08 we do not have need for redirect related Status Values. Some > of those were left in the document due to sloppiness of the editor *g* > when doing -08. Thus 'Accepted_and_Redirected_with_Binding' is now also > removed. To find out whether a redirection took place, Redirect option > in a PBA is sufficient. This is also required to make the redirect > compliant with e.g. RFC5845. > >o Then a bigger one, which concerns the use of Alternate Care-of Address > in RFC5844 & IPv4 transport scope. There is actually no exact text > anywhere (in RFC5844 or RFC5555) what goes in that mobility option when > IPv4 transport is used. Our initial reaction (and actually was the > assumption of some authors) was that IPv4-mapped addresses are just >fine. > > Anyway, as we cannot really be sure we felt that we really need to have > a new mobility option for Alternate IPv4 Care-of Address and define the > the exact behavior for it. In this way we can actually make sure a LMA > understood the Alternate IPv4 Care-of Address. Section 4.4 describes > the new option. We know this is late in document cycle and adds a new > MUST into Section 5.3.2 but it is more or less required. > >Phew.. > >- Jouni >_______________________________________________ >netext mailing list >netext@ietf.org >https://www.ietf.org/mailman/listinfo/netext
- [netext] draft-ietf-netext-redirect-10 jouni korhonen
- Re: [netext] draft-ietf-netext-redirect-10 Basavaraj.Patil