Re: [Softwires] ietf-softwire: IPv4 + PSID primary key for lw4over6 binding
<mohamed.boucadair@orange.com> Tue, 12 July 2016 13:29 UTC
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From: mohamed.boucadair@orange.com
To: Andy Wingo <wingo@igalia.com>
Thread-Topic: [Softwires] ietf-softwire: IPv4 + PSID primary key for lw4over6 binding
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Date: Tue, 12 Jul 2016 13:07:43 +0000
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Subject: Re: [Softwires] ietf-softwire: IPv4 + PSID primary key for lw4over6 binding
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Re-, Please see inline. Cheers, Med > -----Message d'origine----- > De : Andy Wingo [mailto:wingo@igalia.com] > Envoyé : mardi 12 juillet 2016 14:49 > À : BOUCADAIR Mohamed IMT/OLN > Cc : softwires@ietf.org > Objet : Re: [Softwires] ietf-softwire: IPv4 + PSID primary key for > lw4over6 binding > > Hi Mohamed, > > Thank you for your response. > > On Tue 12 Jul 2016 13:46, <mohamed.boucadair@orange.com> writes: > > > [Med] Actually, the data model allows to map a B4 to one or multiple > > softwires. > > > > The rationale for using binding-ipv6info as an index is to ease > > enforcing per-subscriber policies (e.g., limit the number of softwires > > per B4). > > I am new to YANG; apologies in advance for making all of the beginner > mistakes. My understanding of the specification > > list binding-entry { > key "binding-ipv6info"; > description "binding entry"; > uses binding-entry; > } > > was that "binding-ipv6info" uniquely identifies the B4 (because it's a > key within the binding-entry list). Is that not the case? [Med] "binding-ipv6info" uniquely identifies an entry, ** not ** a B4. The B4 is identified by applying, for example, a subscriber-mask (https://tools.ietf.org/html/rfc7785#section-3). That is, a filter on all "binding-ipv6info" that belong, e.g., to the same /56. If it is the > case, how is it possible for one B4 to have multiple softwires? > > >> It seems to me that one CPE could very well have multiple slices of > >> IPv4 addresses. > > > > [Med] That's possible with the current data model: distinct binding > > entries that belong to the same B4 may have distinct IPv4 > > addresses. Whether the same or distinct IPv4 addresses are bound to the > > same B4 is deployment-specific. IMHO, this should be considered with > > caution as it may lead to some applications failures e.g., RTP using > > IPv4@1 while companion RTCP flows are bound to another IPv4@2. > > Indeed. Happily for me though this complexity is on the B4 side of > things ;-) By the time it gets to the AFTR I don't have any sort of > policy decisions to make there. It is a very pleasant standard in that > regard :) [Med] Glad to hear that it is pleasant. > > Regards, > > Andy
- Re: [Softwires] ietf-softwire: IPv4 + PSID primar… Andy Wingo
- Re: [Softwires] ietf-softwire: IPv4 + PSID primar… Andy Wingo
- Re: [Softwires] ietf-softwire: IPv4 + PSID primar… Andy Wingo
- Re: [Softwires] ietf-softwire: IPv4 + PSID primar… mohamed.boucadair
- Re: [Softwires] ietf-softwire: IPv4 + PSID primar… Ian Farrer
- Re: [Softwires] ietf-softwire: IPv4 + PSID primar… Andy Wingo
- Re: [Softwires] ietf-softwire: IPv4 + PSID primar… Andy Wingo
- Re: [Softwires] ietf-softwire: IPv4 + PSID primar… mohamed.boucadair
- Re: [Softwires] ietf-softwire: IPv4 + PSID primar… Linhui Sun
- [Softwires] ietf-softwire: IPv4 + PSID primary ke… Andy Wingo