Re: [Isis-wg] Proposed isis-wg documents - draft-ginsberg-isis-route-preference-00
Christian Hopps <chopps@rawdofmt.org> Tue, 26 August 2014 13:08 UTC
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From: Christian Hopps <chopps@rawdofmt.org>
In-Reply-To: <1B502206DFA0C544B7A60469152008633F3624F1@eusaamb105.ericsson.se>
Date: Tue, 26 Aug 2014 09:08:09 -0400
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References: <1B502206DFA0C544B7A60469152008633F35A17A@eusaamb105.ericsson.se> <FF710BB8-0275-401E-BA3F-3ACC6D40BDE6@rawdofmt.org> <2233_1408625655_53F5EBF7_2233_1538_1_9E32478DFA9976438E7A22F69B08FF9207D942@OPEXCLILM34.corporate.adroot.infra.ftgroup> <F3ADE4747C9E124B89F0ED2180CC814F23EF9517@xmb-aln-x02.cisco.com> <1B502206DFA0C544B7A60469152008633F35E8FC@eusaamb105.ericsson.se> <F3ADE4747C9E124B89F0ED2180CC814F23EFCF83@xmb-aln-x02.cisco.com> <1B502206DFA0C544B7A60469152008633F3624F1@eusaamb105.ericsson.se>
To: Uma Chunduri <uma.chunduri@ericsson.com>
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Archived-At: http://mailarchive.ietf.org/arch/msg/isis-wg/GGFk6vq3a_-hLjkagRC9GjaSmAg
Cc: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Hannes Gredler <hannes@juniper.net>, Christian Hopps <chopps@rawdofmt.org>, "isis-wg@ietf.org list" <isis-wg@ietf.org>
Subject: Re: [Isis-wg] Proposed isis-wg documents - draft-ginsberg-isis-route-preference-00
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As the author of RFC 5308, my intention was not to create a different preference from IPv4, that doesn’t make much sense. In fact my plan was to respin the draft as a bis to correct the difference. I feel it would be helpful to be able to refer to this draft in order to clarify why the change was being made. Thanks, Chris. On Aug 26, 2014, at 4:03 AM, Uma Chunduri <uma.chunduri@ericsson.com> wrote: > Dear Les, > > FWIW - > > 1. For V4, IMO, the problem seen because of incorrect implementation (fix the code in R2) not because of lack of clarity in the specification. So I don’t see any need to clarify anything > (actually, it’s not possible to clarify, more in-line). You still have to “just clearly answer” my original question on which document said to “prefer” the route with “down” bit set for TLV 135. > 2. For V6, it’s good we agreed your solution creates interoperability issues/routing loops. I didn’t understand your goal of matching V4 behavior to V6 behavior. > To me both V4 and V6 specs are clear. > > I am still fine, if the respected WG feel to progress any ways. > > More in-line [Uma]: > -- > Uma C. > > From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] > Sent: Monday, August 25, 2014 6:53 PM > To: Uma Chunduri; stephane.litkowski@orange.com; Christian Hopps > Cc: Hannes Gredler; isis-wg@ietf.org list > Subject: RE: [Isis-wg] Proposed isis-wg documents - draft-ginsberg-isis-route-preference-00 > > Uma - > > … > > >The interoperability issue described was revealed in interoperability testing done by Stephane. He connected two different existing > > implementations in the way described and saw the loop. Given access to the same set of implementations anyone would see the same > >behavior under the conditions described. > > [Uma]: If it’s not then it’s also called “bug” and wearing developer hats we both fix these every day. No? > It’s unfortunate, you thought this need to be fixed through specification. I would only say this implementation “bug” got more attention than it’s deserved or worth! > > >2)You say " There are no route preferences currently defined in RFC 5305". > >… > >" 1. L1 intra-area routes with internal metric; L1 external routes > >with internal metric" > >For TLVs 135/235 we use the following text (see Section 3.3): > >" 1. L1 intra-area routes; L1 external routes". This does NOT represent a change. > >It simply omits text which is not applicable to TLVs 135/235. > > [Uma]: Yes, this does NOT represent a change. Actually, it doesn’t mean ANY THING. > Let me ask this, With RFC 5305 i.e., for TLV 135, how do you distinguish “L1 intra-area routes; L1 external routes”? > You simply can’t and hence I said it’s a redundant statement. > > > 3)It is TRUE that we are modifying the rules for IPV6 L2 Routes w DOWN bit set (TLVs 236,237) as defined in RFC 5308 - > > but that is because there is an error in RFC 5308 and we need to correct it . It does not make sense to apply different rules for IPv4 and IPv6. > > [Uma]: I don’t know if it make sense to have different rules for V4 and V6 (it’s too late to even think). But, I can say this, it doesn’t make sense to me, to create new problems for existing deployments for > the sake of matching V4 and V6. > > > In doing so you are right that it is possible that during the transition we may see a loop problem w IPv6 deployments in cases where we currently would not have seen it. > > [Uma]: At least we agreed on this! > > -- > Uma C.
- Re: [Isis-wg] Proposed isis-wg documents - draft-… Uma Chunduri
- Re: [Isis-wg] Proposed isis-wg documents - draft-… Les Ginsberg (ginsberg)
- Re: [Isis-wg] Proposed isis-wg documents - draft-… Uma Chunduri
- Re: [Isis-wg] Proposed isis-wg documents - draft-… Christian Hopps
- Re: [Isis-wg] Proposed isis-wg documents - draft-… stephane.litkowski
- Re: [Isis-wg] Proposed isis-wg documents - draft-… Les Ginsberg (ginsberg)
- Re: [Isis-wg] Proposed isis-wg documents - draft-… Uma Chunduri
- Re: [Isis-wg] Proposed isis-wg documents - draft-… Uma Chunduri
- Re: [Isis-wg] Proposed isis-wg documents - draft-… Les Ginsberg (ginsberg)
- Re: [Isis-wg] Proposed isis-wg documents - draft-… Uma Chunduri
- Re: [Isis-wg] Proposed isis-wg documents - draft-… Christian Hopps
- Re: [Isis-wg] Proposed isis-wg documents - draft-… Les Ginsberg (ginsberg)
- Re: [Isis-wg] Proposed isis-wg documents - draft-… Uma Chunduri