From nobody Thu Aug 2 10:29:15 2018 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D0862126F72; Thu, 2 Aug 2018 10:29:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id twtztAhBPT6C; Thu, 2 Aug 2018 10:29:10 -0700 (PDT) Received: from orange.com (mta136.mail.business.static.orange.com [80.12.70.36]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 85FAC1292F1; Thu, 2 Aug 2018 10:29:04 -0700 (PDT) Received: from opfednr00.francetelecom.fr (unknown [xx.xx.xx.64]) by opfednr20.francetelecom.fr (ESMTP service) with ESMTP id 41hHGQ4gVSz1yl4; Thu, 2 Aug 2018 19:29:02 +0200 (CEST) Received: from Exchangemail-eme2.itn.ftgroup (unknown [xx.xx.31.18]) by opfednr00.francetelecom.fr (ESMTP service) with ESMTP id 41hHGQ3cWlzDq7Y; Thu, 2 Aug 2018 19:29:02 +0200 (CEST) Received: from OPEXCLILM21.corporate.adroot.infra.ftgroup ([fe80::e92a:c932:907e:8f06]) by OPEXCLILM34.corporate.adroot.infra.ftgroup ([fe80::cba:56d0:a732:ef5a%19]) with mapi id 14.03.0399.000; Thu, 2 Aug 2018 19:29:02 +0200 From: To: Benjamin Kaduk CC: "draft-ietf-spring-segment-routing-ldp-interop@ietf.org" , Rob Shakir , "aretana.ietf@gmail.com" , "spring-chairs@ietf.org" , "spring@ietf.org" , The IESG , Ahmed Bashandy Thread-Topic: Benjamin Kaduk's Discuss on draft-ietf-spring-segment-routing-ldp-interop-13: (with DISCUSS and COMMENT) Thread-Index: AQHUF9eSXwQMtNwAsUGg6AS3/VhrtqSIZWuggAn9z7mAGniqIA== Date: Thu, 2 Aug 2018 17:29:01 +0000 Message-ID: <15201_1533230942_5B633F5E_15201_111_1_53C29892C857584299CBF5D05346208A47B01A84@OPEXCLILM21.corporate.adroot.infra.ftgroup> References: <152951284387.28600.11874107921186798735.idtracker@ietfa.amsl.com> <22642_1531139781_5B4356C5_22642_217_1_53C29892C857584299CBF5D05346208A47AE54BA@OPEXCLILM21.corporate.adroot.infra.ftgroup> <20180709225252.GD59001@kduck.kaduk.org> <31682_1531226969_5B44AB59_31682_103_1_53C29892C857584299CBF5D05346208A47AE73C4@OPEXCLILM21.corporate.adroot.infra.ftgroup> <20180710141101.GP59001@kduck.kaduk.org> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.2] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [spring] Benjamin Kaduk's Discuss on draft-ietf-spring-segment-routing-ldp-interop-13: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: 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IHRoaXMgZW1haWwgaW4gZXJyb3IsIHBsZWFzZSBub3RpZnkgdGhlIHNlbmRlciBhbmQgZGVsZXRl IHRoaXMgbWVzc2FnZSBhbmQgaXRzIGF0dGFjaG1lbnRzLgpBcyBlbWFpbHMgbWF5IGJlIGFsdGVy ZWQsIE9yYW5nZSBpcyBub3QgbGlhYmxlIGZvciBtZXNzYWdlcyB0aGF0IGhhdmUgYmVlbiBtb2Rp ZmllZCwgY2hhbmdlZCBvciBmYWxzaWZpZWQuClRoYW5rIHlvdS4KCg== From nobody Thu Aug 2 10:35:20 2018 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 97539126F72; Thu, 2 Aug 2018 10:35:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.6 X-Spam-Level: X-Spam-Status: No, score=-2.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AtXzbODYeBqy; Thu, 2 Aug 2018 10:35:09 -0700 (PDT) Received: from orange.com (mta135.mail.business.static.orange.com [80.12.70.35]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 03B3C1286E3; Thu, 2 Aug 2018 10:35:09 -0700 (PDT) Received: from opfednr04.francetelecom.fr (unknown [xx.xx.xx.68]) by opfednr23.francetelecom.fr (ESMTP service) with ESMTP id 41hHPR51mNz5vlK; Thu, 2 Aug 2018 19:35:07 +0200 (CEST) Received: from Exchangemail-eme2.itn.ftgroup (unknown [xx.xx.31.69]) by opfednr04.francetelecom.fr (ESMTP service) with ESMTP id 41hHPR3z2kz1xnr; Thu, 2 Aug 2018 19:35:07 +0200 (CEST) Received: from OPEXCLILM21.corporate.adroot.infra.ftgroup ([fe80::e92a:c932:907e:8f06]) by OPEXCLILMA2.corporate.adroot.infra.ftgroup ([fe80::bc1c:ad2f:eda3:8c3d%18]) with mapi id 14.03.0399.000; Thu, 2 Aug 2018 19:35:07 +0200 From: To: Benjamin Kaduk CC: "draft-ietf-spring-segment-routing-ldp-interop@ietf.org" , Rob Shakir , "aretana.ietf@gmail.com" , "spring-chairs@ietf.org" , "spring@ietf.org" , The IESG , Ahmed Bashandy Thread-Topic: Benjamin Kaduk's Discuss on draft-ietf-spring-segment-routing-ldp-interop-13: (with DISCUSS and COMMENT) Thread-Index: AQHUF9eSXwQMtNwAsUGg6AS3/VhrtqSIZWuggAn9z7mAGniqIIAAAhoQ Date: Thu, 2 Aug 2018 17:35:06 +0000 Message-ID: <29759_1533231307_5B6340CB_29759_151_1_53C29892C857584299CBF5D05346208A47B01AE3@OPEXCLILM21.corporate.adroot.infra.ftgroup> References: <152951284387.28600.11874107921186798735.idtracker@ietfa.amsl.com> <22642_1531139781_5B4356C5_22642_217_1_53C29892C857584299CBF5D05346208A47AE54BA@OPEXCLILM21.corporate.adroot.infra.ftgroup> <20180709225252.GD59001@kduck.kaduk.org> <31682_1531226969_5B44AB59_31682_103_1_53C29892C857584299CBF5D05346208A47AE73C4@OPEXCLILM21.corporate.adroot.infra.ftgroup> <20180710141101.GP59001@kduck.kaduk.org> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.2] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [spring] Benjamin Kaduk's Discuss on draft-ietf-spring-segment-routing-ldp-interop-13: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 02 Aug 2018 17:35:13 -0000 U29ycnkgQmVuamFtaW4sIHBsZWFzZSBkaXNyZWdhcmRzLg0KSSBoYWQgbWlzc2VkIHlvdXIgbGFz dCB3ZWVrIHJlcGx5Lg0KDQotLUJydW5vDQoNCiA+IC0tLS0tT3JpZ2luYWwgTWVzc2FnZS0tLS0t DQogPiBGcm9tOiBERUNSQUVORSBCcnVubyBJTVQvT0xODQogPiBTZW50OiBUaHVyc2RheSwgQXVn dXN0IDAyLCAyMDE4IDc6MjkgUE0NCiA+IFRvOiBCZW5qYW1pbiBLYWR1aw0KID4gQ2M6IGRyYWZ0 LWlldGYtc3ByaW5nLXNlZ21lbnQtcm91dGluZy1sZHAtaW50ZXJvcEBpZXRmLm9yZzsgUm9iIFNo YWtpcjsgYXJldGFuYS5pZXRmQGdtYWlsLmNvbTsNCiA+IHNwcmluZy1jaGFpcnNAaWV0Zi5vcmc7 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In-Reply-To: <2120B719-EB92-4A47-A26C-0E2E810F1CA8@gmail.com> References: <40ED2C86-3403-4D89-8CA8-FBB9651BF2AB@gmail.com> <6dd41180-83bd-c02e-1783-df873e749941@gmail.com> <465981C7-7AB1-43AF-8A80-69D835871077@gmail.com> <8652B1BB-C2E7-4324-8E79-E3092362AE1A@gmail.com> <2120B719-EB92-4A47-A26C-0E2E810F1CA8@gmail.com> From: Gaurav Dawra Date: Fri, 3 Aug 2018 10:50:24 +0530 Message-ID: To: =?UTF-8?Q?Mirja_K=C3=BChlewind?= Cc: Alvaro Retana , Martin Stiemerling , SPRING WG , tsv-art@ietf.org Content-Type: multipart/alternative; boundary="000000000000c28eed0572811551" Archived-At: Subject: Re: [spring] [Tsv-art] TSV-ART review of draft-ietf-spring-segment-routing-msdc-08 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 03 Aug 2018 05:20:31 -0000 --000000000000c28eed0572811551 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hey Mirja, Sorry for the long delay. I was traveling constantly since IETF and bit lost in my mailbox and discussion with Authors. Please see my response inline[Gaurav] I think with your changes you addressed explicit problems Martin called out, however, I still have high level concerns about these sections as they are mostly giving speculative recommendation which are not clear to me to work in practice. Regarding section 7.1, you say "A flowlet is defined as a burst of packets from the same flow followed by an idle interval." but then you say "...then the application can break the elephant flow F into flowlets F1, F2, F3, F4..." This sounds like you would just divide an elephant flow mostly randomly into flowlets which can interact badly with the congestion control. If you actually have chunks of data that are transmitted with large enough idle interval in between (as you define flowlets in the first sentence), that is not an elephant flow anymore and it will not help you to "spread the load of the elephant flow through all the ECMP paths". In summary I actually don't see how the concept of flowlets can be helpful to address the problem you have at all, and I still advise you to remove section 7.1 entirely. [Gaurav] Hi Mirja, Thanks for the review. The proposal here is no different that current ECMP hashing at flowlet level. The only difference which is being pointed out here is that if we use SR, we could leverage on the ability of be aware of multiple disjoint paths rather than the hashing. It=E2=80=99s pins the flowlets to particular paths which is basic SR operat= ions. Regarding section 7.2, I also still skeptical about any benefits that can be achieved. Given you are in a data center, the controller should already know about static parameters such as the maximum bandwidth per link. For dynamic parameters, e.g. like loss rate, measuring them on a per-flow bases is the wrong thing to do. What I mean is you can ask a router about the average loss rate that it observes and that might give you some valuable, however, if you ask a TCP flow about the average loss rate the answer will mainly depend on the congestion controller used and the currently available bandwidth, which is a very dynamic property and not a link characteristic. So this information is not usable for performance aware routing. A flow could give you information about the observed RTT (min/max) on a certain path, or the maximum available bandwidth on a path, but as I said, given you are in a data center environment these are information that the controller already should have anyway. [Gaurav] They are two separate mechanisms. Most DCs have some sort of data-plane/ECMP aware tracing mechanism to detect the loss/delays and can be combined with Application back-off to detect issue. All this section is suggesting is that SR can be used to pin the path to particular set of ECMP paths instead of relying on ECMP hashing. Your example with detecting a faulty path due to losses does not work with TCP as you never know if these loses are due to a problem on the path, self-induced or by a competing flow. And even if you don't use TCP and e.g. send constant bit rate traffic, there may be a large number of competing TCP flows that can induce the loses. Try to steer traffic "away" on a time-scale that is slower than TCP dynamics or even your flow dynamic (when flows start or end) in case you have a lot of very short flow, in the best case doesn't work and in the worst case leads to oscillation. [Gaurav] As I said above, there are other mechanisms to detect loss and trace the path on which loss is seen. This is a common mechanism used in MSDCs. I am happy to discuss further over the phone to try to explain the thought process. I will also do check again with Authors to update the text or something else based on our conversation. Cheers, Gaurav If you want to make TCP use for handover situation where one path might go away or become unusable, it's best to use Multipath TCP (with coupled congestion control) instead because that works on the right time scale. Again, I don't think this is a use case for SR and I would recommend to remove the section entirely. Mirja On Mon, Jul 16, 2018 at 11:08 PM, Gaurav Dawra wrote: > Hi Mirja, > > Ack. Let me work with authors to close ASAP. > > Cheers, > > Gaurav > > Sent from my iPhone > > On Jul 5, 2018, at 10:06 AM, Mirja K=C3=BChlewind w= rote: > > Hi Gaurav, > > sorry for my very long delay but this got somehow a bit lost in my mailbo= x. > > I think with your changes you addressed explicit problems Martin called > out, however, I still have high level concerns about these sections as th= ey > are mostly giving speculative recommendation which are not clear to me to > work in practice. > > Regarding section 7.1, you say > "A flowlet is defined as a burst of packets from the same flow followed b= y > an idle interval." > but then you say > "...then the application can break the elephant flow F into flowlets F1, > F2, F3, F4..." > > This sounds like you would just divide an elephant flow mostly randomly > into flowlets which can interact badly with the congestion control. If yo= u > actually have chunks of data that are transmitted with large enough idle > interval in between (as you define flowlets in the first sentence), that = is > not an elephant flow anymore and it will not help you to "spread the load > of the elephant flow through all the ECMP paths". In summary I actually > don't see how the concept of flowlets can be helpful to address the probl= em > you have at all, and I still advise you to remove section 7.1 entirely. > > Regarding section 7.2, I also still skeptical about any benefits that can > be achieved. Given you are in a data center, the controller should alread= y > know about static parameters such as the maximum bandwidth per link. For > dynamic parameters, e.g. like loss rate, measuring them on a per-flow bas= es > is the wrong thing to do. What I mean is you can ask a router about the > average loss rate that it observes and that might give you some valuable, > however, if you ask a TCP flow about the average loss rate the answer wil= l > mainly depend on the congestion controller used and the currently availab= le > bandwidth, which is a very dynamic property and not a link characteristic= . > So this information is not usable for performance aware routing. A flow > could give you information about the observed RTT (min/max) on a certain > path, or the maximum available bandwidth on a path, but as I said, given > you are in a data center environment these are information that the > controller already should have anyway. > > Your example with detecting a faulty path due to losses does not work wit= h > TCP as you never know if these loses are due to a problem on the path, > self-induced or by a competing flow. And even if you don't use TCP and e.= g. > send constant bit rate traffic, there may be a large number of competing > TCP flows that can induce the loses. Try to steer traffic "away" on a > time-scale that is slower than TCP dynamics or even your flow dynamic (wh= en > flows start or end) in case you have a lot of very short flow, in the bes= t > case doesn't work and in the worst case leads to oscillation. > > If you want to make TCP use for handover situation where one path might g= o > away or become unusable, it's best to use Multipath TCP (with coupled > congestion control) instead because that works on the right time scale. > Again, I don't think this is a use case for SR and I would recommend to > remove the section entirely. > > Mirja > > > On 05.07.2018 04:08, Gaurav Dawra wrote: > > Hey Alvaro, Mirja, > > Friendly reminder to further progress this document. > > Cheers, > > Gaurav > > On Mon, Jun 18, 2018 at 5:13 PM, Gaurav Dawra > wrote: > >> Hi Alvaro, Mirja >> >> Any feedback or next steps to close this? >> >> Cheers, >> >> Gaurav >> >> Sent from my iPhone >> >> On Jun 12, 2018, at 7:06 AM, Gaurav Dawra wrote: >> >> Hi Mirja, >> >> Friendly Reminder...Could you please also advice if there is anything >> further to DISCUSS on this document which was also related to TCP update= s >> below? >> >> Cheers, >> >> Gaurav >> >> On Thu, Jun 7, 2018 at 9:02 AM, Alvaro Retana >> wrote: >> >>> Thanks Martin! >>> >>> On June 6, 2018 at 3:14:45 PM, Martin Stiemerling (mls.ietf@gmail.com) >>> wrote: >>> >>> Hi Alvaro, all, >>> >>> Thanks for addressing my concerns. >>> >>> This version is good to go from my side. >>> >>> Kind regards, >>> >>> ;Martin >>> >>> Am 30.05.18 um 21:55 schrieb Alvaro Retana: >>> > Martin: >>> > br/>> Hi!! How are you? >>> > br/>> Gaurav just posted a revision. Please takke a look and let us >>> know if br/>> the changes address your concerrns or not. >>> > br/>> https://www.ietf.org/rfcdiff??url2=3Ddraft-ietf-spring-segment >>> -routing-msdc-09 >>> > br/>> Thanks!!! >>> > br/>> Alvaro. < >>> > br/>> On May 25, 2018 at 12:08:46 PM, Gaurav Dawra (( >>> gdawra.ietf@gmail.com br/>> ) wrote: >>> > br/>>> Hi Martin, < >>> >> >>> >> Thanks for review. I will post the new version. Hopefully, it will >>> br/>>> address all your comments and we can close thhis review. >>> >> >>> >> Any updates on below response? >>> >> >>> >> Cheers, >>> >> >>> >> Gaurav >>> >> >>> >> Sent from my iPhone >>> >> >>> >> On May 23, 2018, at 4:17 AM, Gaurav Dawra >> br/>>> > wrote: >>> >> >>> >>> Hi Martin, >>> >>> >>> >>> Thanks for the review. Any further comments here ? I will post the >>> br/>>>> new version soon. < >>> >>> >>> >>> Cheers, >>> >>> >>> >>> Gaurav >>> >>> >>> >>> Sent from my iPhone >>> >>> >>> >>> On May 16, 2018, at 7:44 PM, Gaurav Dawra >> br/>>>> >> wrote: >>> >>> >>> >>>> Hi Martin, >>> >>>> >>> >>>> Apologies from my end we had few internal authors conversations on >>> br/>>>>> the points you have raised. < >>> >>>> >>> >>>> Please find below my response. I will be happy to discuss further, >>> br/>>>>> if needed. < >>> >>>> >>> >>>> inline... >>> >>>> >>> >>>>> On Apr 9, 2018, at 7:58 AM, Martin Stiemerling >> br/>>>>>> > wrote: >>> >>>>> >>> >>>>> Hi Gaurav, >>> >>>>> >>> >>>>> This got lost on my end, sorry for this. The filter just moved >>> br/>>>>>> these messages out of my sight... :-/ >>> >>>>> >>> >>>>> Am 15.02.18 um 05:47 schrieb Gaurav Dawra: >>> >>>>>> Hey Martin, >>> >>>>>> Sorry for late reply. Please see some comments inline[Gaurav] >>> >>>>>>> On Jan 9, 2018, at 2:25 PM, Martin Stiemerling br/>>>>>>>> >>> br/>>>>>>>>; >> mls.ietf@gmail.com>> wrote: >>> >>>>>>> >>> >>>>>>> Hi all, >>> >>>>>>> >>> >>>>>>> I've reviewed this document as part of the transport area revie= w >>> br/>>>>>>>> team's ongoing effort to review key IETF documents. These >>> br/>>>>t;>>>> comments were written primarily for the transport area >>> directors, br/>>>>>>>> but are copied to the doocument's authors for th= eir >>> information br/>>>>>>>&> and to allow them to address any issues raised= . >>> When done at the >>> >>>>>>> time of IETF Last Call, the authors should consider this review >>> br/>>>>>>>> together with any other last-call comments they receive. Pl= ease >>> br/>>>&>>>>> always CC tsv-art@=E2=80=A6 if you reply to or forward thi= s >>> review. >>> >>>>>>> >>> >>>>>>> Summary: >>> >>>>>>> This draft has serious issues in Section 7..1, 7.2 and in one >>> part br/>>>>>>>> of Secction3, described in the review, and needs to be >>> rethought. br/>>&>>>>>> The other sections are good AFAIK. >>> >>>>>>> >>> >>>>>>> >>> >>>>>>> Technicals: >>> >>>>>>> The overall draft looks ok, but the three points below look >>> br/>>>>>>>> strange and need a fix before publication IMHO: >>> >>>>>>> >>> >>>>>>> Both Sections, 7.1. and 7.2., are describing ideas, but not wel= l >>> br/>>>>>>>> proven funcationality and not even safe to use functionalit= y. >>> br/>>>&>>>>> Both are some sort discussing that different paths in the >>> network br/>>>>>>>> could be used by the eend host traffic. This sounds >>> pretty much br/>>>>>>>t;> like the Path Aware Networking Proposed >>> Research Group br/>>t;>>>>>> (https://irtf.org/panrg) and hints to >>> the fact that there is no br/>>>>>>>> commonly understannd and accepted >>> engineering solution in this space. >>> >>>>>>> >>> >>>>>>> Section 7.1: >>> >>>>>>> [KANDULA04] is a really old reference that hasn't been followed >>> br/>>>>>>>> up iin recent times and even worse there is no evidence tha= t >>> this br/>>t;>>>>>> is going to work good enough or stable enough unde= r >>> real Internet br/>>>>>>>> traffic. Additioonally, it is more than uncle= ar >>> how any modern TCP br/>>>>&ggt;>>> implementation will react to this >>> >>>>>> [Gaurav] Will get back on this. >>> >>>>> >>> >>>>> I will reply to the other email dicussing this. >>> >>>> I have replied to other thread. >>> >>>>> >>> >>>>>>> >>> >>>>>>> Section 7.2: >>> >>>>>>> This section describes an idea without detailing too much about >>> br/>>>>>>>> any furtther aspects. Further it changes the commonly accep= ted >>> br/>>>;>>>>> notion of what an end host can do with the network. At bes= t >>> this br/>>>>>>>> would require a good ddefinition of what an end host i= n >>> your br/>>>>>>>&ggt; setting is, e.g., a highly modified piece of (at >>> least) software >>> >>>>>>> that usually not found in OS availble on the market (yet?) >>> >>>>>>> Further communicating instantaneous path characteristics to a >>> br/>>>>>>>> central point is potentially a bad idea, as the data is alr= eady >>> br/>>>;>>>>> outdated when reported by any node. >>> >>>>>> [Gaurav] I believe Authors are trying to highlight that Host >>> which br/>>>>>>> is defineed in br/>>>>>>> ( >>> https://tools.ietf.org/html/draftt-ietf-spring-segment-routing-15) >>> br/>>>>>>> can innfluence the traffic based on the Calculations locally= or >>> br/>>>t;>>>> jointly with the controller. Implementations can decide = how >>> much br/>>>>>>> Centralized -vs- localized coontrol is allowed at Host >>> based on br/>>>>>>> perfoormance data collection. >>> >>>>> >>> >>>>> Performance data collection (monitoring?) isn't crucial when it >>> br/>>>>>> comes to timely (actuaally real-time) reaction. However, this >>> br/>>>>>> secttion isn't just about performance data collection as it i= s >>> about br/>>>>>>> "Performance-aware routing" this seems to try to inter= act >>> in br/>>>>>> real-time with the network behhavior of TCP. This isn't ev= en >>> close br/>>>>>> to acceeptable. >>> >>>>> >>> >>>>> I would be ok to say that it is useful to collect performance dat= a >>> br/>>>>>> for offline analysis and improvement of the data network. >>> However, br/>>>>>&ggt; this is at completely different magnitues of tim= e >>> scales. >>> >>>>> >>> >>>>> I would recommend to remove the TCP part from this section >>> entirely. >>> >>>> Ack, will update in next rev: >>> >>>> >>> >>>> Section will read like this: >>> >>>> >>> >>>> ; >>> >>>> /Knowing the path associated with flows/packets, the end host may/ >>> >>>> /deduce certain characteristics of the path on its own, and/ >>> >>>> /additionally use the information supplied with path information/ >>> >>>> /pushed from the controller or received via pull request. The host= / >>> >>>> /may further share its path observations with the centralized >>> agent,/ >>> >>>> /so that the latter may keep up-to-date network health map to >>> assist/ >>> >>>> /other hosts with this information./ >>> >>>> // >>> >>>> /For example, an application A.1 at HostA may pin a flow destined/ >>> >>>> /to HostZ via Spine node Node5 using label stack {16005, 16011}. >>> The/ >>> >>>> /application A.1 may collect information on packet loss, deduced >>> from/ >>> >>>> /Other offline mechanisms. [There are some pingMesh mechanisms >>> which / >>> >>>> /Can be used here]/ >>> >>>> /Through these mechanisms information to a centralized agent, e.g.= / >>> >>>> /after a flow completes, or periodically for longer lived flows./ >>> >>>> /Next, using both local and/or global performance data, >>> application/ >>> >>>> /A.1 as well as other applications sharing the same resources in >>> the/ >>> >>>> /DC fabric may pick up the best path for the new flow, or update >>> an/ >>> >>>> /existing path (e.g.: when informed of congestion on an existing/ >>> >>>> /path)./ >>> >>>> ; >>> >>>> >>> >>>>> >>> >>>>> >>> >>>>>>> >>> >>>>>>> Section 3, 3rd bullet point: >>> >>>>>>> It is the foundation of TCP that the network is regarded as a >>> br/>>>>>>>> black box and that you infer from the transmission of packe= ts >>> br/>>>>;>>>> what the current state of the network path is. Inferring >>> network br/>>>>>>>> path metrics (you mention SRTT, MSS, CWND ) is a ba= d >>> idea, as br/>>>>>>>>; this would required that all paths exhibit this a= nd >>> if not what br//>>>>>>>> is going to happen? >>> >>>>>>> It could be an interesting research field to change many points >>> br/>>>>>>>> in TCP'ss behavior, but this once again points to the fact = that >>> br/>>>&>>>>> this not the IETF works but IRTF or elsewhere. >>> >>>>>> [Gaurav] Martin, Authors are trying to suggest that TCP is >>> rightly br/>>>>>>> treating Network as Black Box. Authors are implying = per >>> path br/>>>>;>>> performance metrics as not cached. Is there some chang= e in >>> text br/>>>>>>> you are suggesting?? >>> >>>>> >>> >>>>> >>> >>>>> I would recommend to remove the 3rd bullet point completey. TCP >>> br/>>>>>> isn't the place to rememmber "good" or "bad" paths. This is >>> br/>>>>>> something the network could decide, e.g., rerouting TCP flows >>> br/>&ggt;>>>> within the network or changing the forwarding path in the >>> network br/>>>>>> for particular flows (if it is not routed). >>> >>>> >>> >>>> Ack, after discussion, we will remove the Section 3 - 3rd >>> br/>>>>> bullet point. Willl update in next rev - coming shortly. >>> >>>> >>> >>>>> >>> >>>>> Kind regards, >>> >>>>> >>> >>>>> Martin >>> >>>>> >>> >>>> >>> >>> >> > > > _______________________________________________ > Tsv-art mailing listTsv-art@ietf.orghttps://www.ietf.org/mailman/listinfo= /tsv-art > > > --000000000000c28eed0572811551 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hey Mirja,

Sorry for the long delay. I = was traveling constantly since IETF and bit lost in my mailbox and discussi= on with Authors. Please see my response inline[Gaurav]


I think with your changes you addressed ex= plicit problems Martin called out, however, I still have high level concern= s about these sections as they are mostly giving speculative recommendation= which are not clear to me to work in practice.

Regarding section 7.1, you say
"A flowlet is defined as a burst of= packets from the same flow followed by an idle interval."
but then you say "...then the application can break th= e elephant flow F into flowlets F1, F2, F3, F4..."

This sounds like you would just divide an = elephant flow mostly randomly into flowlets which can interact badly with t= he congestion control. If you actually have chunks of data that are transmi= tted with large enough idle interval in between (as you define flowlets in = the first sentence), that is not an elephant flow anymore and it will not h= elp you to "spread the load of the elephant flow through all the ECMP = paths". In summary I actually don't see how the concept of flowlet= s can be helpful to address the problem you have at all, and I still advise= you to remove section 7.1 entirely.

[Gaurav] Hi Mi= rja, Thanks for the review. The proposal here is no dif= ferent that current ECMP hashing at flowlet level. The only difference whic= h is being pointed out here is that if we use SR, we could leverage on the = ability of be aware of multiple disjoint paths rather than the hashing. It= =E2=80=99s pins the flowlets to particular paths which is basic SR operatio= ns.

Regarding section 7.2, I also still skepti= cal about any benefits that can be achieved. Given you are in a data center= , the controller should already know about static parameters such as the ma= ximum bandwidth per link.

For dynamic pa= rameters, e.g. like loss rate, measuring them on a per-flow bases is the wr= ong thing to do. What I mean is you can ask a router about the average loss= rate that it observes and that might give you some valuable, however, if y= ou ask a TCP flow about the average loss rate the answer will mainly depend= on the congestion controller used and the currently available bandwidth, w= hich is a very dynamic property and not a link characteristic. So this info= rmation is not usable for performance aware routing. A flow could give you = information about the observed RTT (min/max) on a certain path, or the maxi= mum available bandwidth on a path, but as I said, given you are in a data c= enter environment these are information that the controller already should = have anyway.

[Gaurav] They = are two separate mechanisms. Most DCs have some sort of= data-plane/ECMP aware tracing mechanism to detect the loss/delays and can = be combined with Application back-off to detect issue. All this section is = suggesting is that SR can be used to pin the path to particular set of ECMP= paths instead of relying on ECMP hashing.

Your example with detecting a faulty path = due to losses does not work with TCP as you never know if these loses are d= ue to a problem on the path, self-induced or by a competing flow. And even = if you don't use TCP and e.g. send constant bit rate traffic, there may= be a large number of competing TCP flows that can induce the loses. Try to= steer traffic "away" on a time-scale that is slower than TCP dyn= amics or even your flow dynamic (when flows start or end) in case you have = a lot of very short flow, in the best case doesn't work and in the wors= t case leads to oscillation.

[Gaurav] As I said above, there are other mechanisms to detect loss a= nd trace the path on which loss is seen. This is a common mechanism used in= MSDCs.

=C2=A0

I am happy to discuss further o= ver the phone to try to explain the thought process. I will also do check a= gain with Authors to update the text or something else based on our convers= ation.

=C2=A0

Cheers,

=C2=A0

Gaurav

If you want to make TCP use for handover s= ituation where one path might go away or become unusable, it's best to = use Multipath TCP (with coupled congestion control) instead because that wo= rks on the right time scale. Again, I don't think this is a use case fo= r SR and I would recommend to remove the section entirely.

Mirja

=C2=A0



O= n Mon, Jul 16, 2018 at 11:08 PM, Gaurav Dawra <gdawra.ietf@gmail.com> wrote:
Hi= Mirja,

Ack. Let me work with authors to close ASAP.
Cheers,

Gaurav
Sent from my iPho= ne
=20 =20 =20 =20 Hi Gaurav,

sorry for my very long delay but this got somehow a bit lost in my mailbox.

I think with your changes you addressed explicit problems Martin called out, however, I still have high level concerns about these sections as they are mostly giving speculative recommendation which are not clear to me to work in practice.

Regarding section 7.1, you say
"A flowlet is defined as a burst of packets from the same flow followed by an idle interval."
but then you say
"...then the application can break the elephant flow F into flowle= ts F1, F2, F3, F4..."

This sounds like you would just divide an elephant flow mostly randomly into flowlets which can interact badly with the congestion control. If you actually have chunks of data that are transmitted with large enough idle interval in between (as you define flowlets in the first sentence), that is not an elephant flow anymore and it will not help you to "spread the load of the elephant flow through all the ECMP paths". In summary I actually don't see how the c= oncept of flowlets can be helpful to address the problem you have at all, and I still advise you to remove section 7.1 entirely.

Regarding section 7.2, I also still skeptical about any benefits that can be achieved. Given you are in a data center, the controller should already know about static parameters such as the maximum bandwidth per link. For dynamic parameters, e.g. like loss rate, measuring them on a per-flow bases is the wrong thing to do. What I mean is you can ask a router about the average loss rate that it observes and that might give you some valuable, however, if you ask a TCP flow about the average loss rate the answer will mainly depend on the congestion controller used and the currently available bandwidth, which is a very dynamic property and not a link characteristic. So this information is not usable for performance aware routing. A flow could give you information about the observed RTT (min/max) on a certain path, or the maximum available bandwidth on a path, but as I said, given you are in a data center environment these are information that the controller already should have anyway.

Your example with detecting a faulty path due to losses does not work with TCP as you never know if these loses are due to a problem on the path, self-induced or by a competing flow. And even if you don't use TCP and e.g. send constant bit rate traffic, there may be a large number of competing TCP flows that can induce the loses. Try to steer traffic "away" on a time-scale that is slower than T= CP dynamics or even your flow dynamic (when flows start or end) in case you have a lot of very short flow, in the best case doesn't work an= d in the worst case leads to oscillation.

If you want to make TCP use for handover situation where one path might go away or become unusable, it's best to use Multipath TCP (with coupled congestion control) instead because that works on the right time scale. Again, I don't think this is a use case for SR an= d I would recommend to remove the section entirely.

Mirja


On 05.07.2018 04:0= 8, Gaurav Dawra wrote:
Hey Alvaro, Mirja,=C2=A0

Friendly reminder to further progress this document.

Cheers,

Gaurav

On Mon, Jun 18, 2018 at 5:13 PM, Gaurav Dawra <gdawra.ietf@gmail.com> wrote:
Hi Alvaro, Mirja=C2=A0

Any feedback or next steps to close this?

Cheers,

Gaurav

Sent from my iPhone

On Jun 12, 2018, at 7:06 AM, Gaurav Dawra <gdawra.ietf@gmail.com> wrote:

Hi Mirja,

Friendly Reminder...Could you please also advice if there is anything further to DISCUSS on this document which was also related to TCP updates below?

Cheers,

Gaurav

On Thu, Jun 7, 2018 at 9:02 AM, Alvaro Retana &= lt;aretana.ietf= @gmail.com> wrote:

Thanks Martin!


On June 6, 2018 at 3:14:45 PM, Martin Stiemerling (mls.ietf@gmail.com) wrote:
Hi Alvaro, all,

Thanks for addressing my concerns.

This version is good to go from my side.

Kind regards,

;Martin

Am 30.05.18 um 21:55 schrieb Alvaro Retana:
> Martin:
> br/>> Hi!!=C2=A0 How are you?
> br/>> Gaurav just posted a revision.=C2=A0 Please tak= ke a look and let us know if br/>> the changes address your concerrns or not.
> br/>> https://www.ietf.org/rfcdiff??url2=3Ddraft-ietf-spring= -segment-routing-msdc-09
> br/>> Thanks!!!
> br/>> Alvaro. <
> br/>> On May 25, 2018 at 12:08:46 PM, Gaurav Dawra ((gdawra.ietf@gmail.co= m br/>> <mailto:gdawra.ietf@@gmail.com>) wrote:
> br/>>> Hi Martin, <
>>
>> Thanks for review. I will post the new version. Hopefully, it will br/>>> address all your comments and we can close thhis review.
>>
>> Any updates on below response?
>>
>> Cheers,
>>
>> Gaurav
>>
>> Sent from my iPhone
>>
>> On May 23, 2018, at 4:17 AM, Gaurav Dawra <gdawra.ietf@gmail.com br/>>> <mailto:gdawra.ietf@@gmail.com>> wrote:
>>
>>> Hi Martin,
>>>
>>> Thanks for the review. Any further comments here ? I will post the br/>>>> new version soon. <
>>>
>>> Cheers,
>>>
>>> Gaurav
>>>
>>> Sent from my iPhone
>>>
>>> On May 16, 2018, at 7:44 PM, Gaurav Dawra <gdawra.ietf@gmail.com br/>>>> <mailto:gdawra.ietf@@gmail..com>> wrote:
>>>
>>>> Hi Martin,
>>>>
>>>> Apologies from my end we had few internal authors conversations on br/>>>>> the points you have raised. <
>>>>
>>>> Please find below my response. I will be happy to discuss further, br/>>>>> if needed. <
>>>>
>>>> <Gaurav> inline...
>>>>
>>>>> On Apr 9, 2018, at 7:58 AM, Martin Stiemerling <mls.ietf@gmail.com br/>>>>>> <mailto:mls.iietf@gmail.com>> wrote:
>>>>>
>>>>> Hi Gaurav,
>>>>>
>>>>> This got lost on my end, sorry for this. The filter just moved br/>>>>>> these messages out of my sight... :-/
>>>>>
>>>>> Am 15.02.18 um 05:47 schrieb Gaurav Dawra:
>>>>>> Hey Martin,
>>>>>> Sorry for late reply. Please see some comments inline[Gaurav]
>>>>>&g= t;> On Jan 9, 2018, at 2:25 PM, Martin Stiemerling br/>>>>>>>&g= t; <mls.ietf@@gmail.com <mailto:mls.ietf@gmail.com> br/>>>>>>>>; <mailto:mls.ietf@gmail.com>> wrote:
>>>>>>>
>>>>>>> Hi all,
>>>>>>>
>>>>>>> I've reviewed this document as part of the transport area review br/>>>>>>>> team's ongoing effort to review key IETF documents. These br/>>>&gtt;>>>= ;> comments were written primarily for the transport area directors, br/>>>>>>>> but are copied to the doocument's authors for their information br/>>>>>>>&= ;> and to allow them to address any issues raised. When done at the
>>>>>>> time of IETF Last Call, the authors should consider this review br/>>>>>>>> together with any other last-call comments they receive. Please br/>>>&>>>>= ;> always CC tsv-art@=E2=80=A6 if you = reply to or forward this review.
>>>>>>>
>>>>>>> Summary:
>>>>>>> This draft has serious issues in Section 7..1, 7.2 and in one part br/>>>>>>>> of Secction3, described in the review, and needs to be rethought. br/>>&>>>>>= ;> The other sections are good AFAIK.
>>>>>>>
>>>>>>>
>>>>>>> Technicals:
>>>>>>> The overall draft looks ok, but the three points below look br/>>>>>>>> strange and need a fix before publication IMHO:
>>>>>>>
>>>>>>> Both Sections, 7.1. and 7.2., are describing ideas, but not well br/>>>>>>>> proven funcationality and not even safe to use functionality. br/>>>&>>>>> Both are some sort discussing that different paths in the network br/>>>>>>>> could be used by the eend host traffic. This sounds pretty much br/>>>>>>&gtt;> like the Path Aware Networking Proposed Research Group br/>&gtt;>>>>>= ;> (https://irtf.org/panrg) and hints to the fact that there is no br/>>>>>>>> commonly understannd and accepted engineering solution in this space.
>>>>>>>
>>>>>>> Section 7.1:
>>>>>>> [KANDULA04] is a really old reference that hasn't been followed br/>>>>>>>> up iin recent times and even worse there is no evidence that this br/>&gtt;>>>>>= ;> is going to work good enough or stable enough under real Internet br/>>>>>>>> traffic. Additioonally, it is more than unclear how any modern TCP br/>>>>&ggt;>>= ;> implementation will react to this
>>>>>> [Gaurav] Will get back on this.
>>>>>
>>>>> I will reply to the other email dicussing this.
>>>> <Gaurav> I have replied to other thread.
>>>>>
>>>>>>>
>>>>>>> Section 7.2:
>>>>>>> This section describes an idea without detailing too much about br/>>>>>>>> any furtther aspects. Further it changes the commonly accepted br/>>>;>>>>>= ; notion of what an end host can do with the network. At best this br/>>>>>>>> would require a good ddefinition of what an end host in your br/>>>>>>>&= ;ggt; setting is, e.g., a highly modified piece of (at least) software
>>>>>>> that usually not found in OS availble on the market (yet?)
>>>>>>> Further communicating instantaneous path characteristics to a br/>>>>>>>> central point is potentially a bad idea, as the data is already br/>>>;>>>>> outdated when reported by any node.
>>>>>> [Gaurav] I believe Authors are trying to highlight that Host which br/>>>>>>> is defineed in br/>>>>>>> (https://tools= .ietf.org/html/draftt-ietf-spring-segment-routing-15) br/>>>>>>> can innfluence the traffic based on the Calculations locally or br/>>&gtt;>>>>= ; jointly with the controller. Implementations can decide how much br/>>>>>>> Centralized -vs- localized coontrol is allowed at Host based on br/>>>>>>> perfoormance data collection.
>>>>>
>>>>> Performance data collection (monitoring?) isn't crucial when it br/>>>>>> comes to timely (actuaally real-time) reaction. However, this br/>>>>>> secttion isn't just about performance data collection as it is about br/>>>>>>> "Performance-aware routing&quo= t; this seems to try to interact in br/>>>>>> real-time with the network behhavior of TCP. This isn't even close br/>>>>>> to acceeptable.
>>>>>
>>>>> I would be ok to say that it is useful to collect performance data br/>>>>>> for offline analysis and improvement of the data network. However, br/>>>>>&ggt; this is at completely different magnitues of time scales.
>>>>>
>>>>> I would recommend to remove the TCP part from this section entirely.
>>>> <Gaurav>Ack, will update in next rev:
>>>>
>>>> Section will read like this:
>>>>
>>>> ;
>>>> /Knowing the path associated with flows/packets, the end host may/
>>>> /deduce certain characteristics of the path on its own, and/
>>>> /additionally use the information supplied with path information/
>>>> /pushed from the controller or received via pull request. The host/
>>>> /may further share its path observations with the centralized agent,/
>>>> /so that the latter may keep up-to-date network health map to assist/
>>>> /other hosts with this information./
>>>> //
>>>> /For example, an application A.1 at HostA may pin a flow destined/
>>>> /to HostZ via Spine node Node5 using label stack {16005, 16011}. The/
>>>> /application A.1 may collect information on packet loss, deduced from/
>>>> /Other offline mechanisms. [There are some pingMesh mechanisms which /
>>>> /Can be used here]/
>>>> /Through these mechanisms information to a centralized agent, e.g./
>>>> /after a flow completes, or periodically for longer lived flows./
>>>> /Next, using both local and/or global performance data, application/
>>>> /A.1 as well as other applications sharing the same resources in the/
>>>> /DC fabric may pick up the best path for the new flow, or update an/
>>>> /existing path (e.g.: when informed of congestion on an existing/
>>>> /path)./
>>>> ;
>>>>
>>>>>
>>>>>
>>>>>>>
>>>>>>> Section 3, 3rd bullet point:
>>>>>>> It is the foundation of TCP that the network is regarded as a br/>>>>>>>> black box and that you infer from the transmission of packets br/>>>>;>>>> what the current state of the network path is. Inferring network br/>>>>>>>> path metrics (you mention SRTT, MSS, CWND ) is a bad idea, as br/>>>>>>>>= ; this would required that all paths exhibit this and if not what br//>>>>>>>>= ; is going to happen?
>>>>>>> It could be an interesting research field to change many points br/>>>>>>>> in TCP'ss behavior, but this once again points to the fact that br/>>>&>>>>= ;> this not the IETF works but IRTF or elsewhere.
>>>>>> [Gaurav] Martin, Authors are trying to suggest that TCP is rightly br/>>>>>>> treating Network as Black Box. Authors are implying per path br/>>>>;>>> performance metrics as not cached. Is there some change in text br/>>>>>>> you are suggesting??
>>>>>
>>>>>
>>>>> I would recommend to remove the 3rd bullet point completey. TCP br/>>>>>> isn't the place to rememmber "good" or "bad"= paths. This is br/>>>>>> something the network could decide, e.g., rerouting TCP flows br/>&ggt;>>>> within the network or changing the forwarding path in the network br/>>>>>> for particular flows (if it is not routed).
>>>>
>>>> <Gaurav> Ack, after discussion, we will remove the Section 3 - 3rd br/>>>>> bullet point.=C2=A0Willl update in next re= v - coming shortly.
>>>>
>>>>>
>>>>> Kind regards,
>>>>>
>>>>> =C2=A0Martin
>>>>>
>>>> 




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--000000000000c28eed0572811551-- From nobody Mon Aug 6 07:48:21 2018 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D4107130E3B; Mon, 6 Aug 2018 07:29:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.589 X-Spam-Level: X-Spam-Status: No, score=-2.589 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, UNPARSEABLE_RELAY=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id okL2Wq_jXzo6; Mon, 6 Aug 2018 07:29:37 -0700 (PDT) Received: from orange.com (mta240.mail.business.static.orange.com [80.12.66.40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 25D2D130E43; Mon, 6 Aug 2018 07:29:36 -0700 (PDT) Received: from opfedar03.francetelecom.fr (unknown [xx.xx.xx.5]) by opfedar26.francetelecom.fr (ESMTP service) with ESMTP id 41kg5T55zTzFqLp; Mon, 6 Aug 2018 16:29:33 +0200 (CEST) Received: from Exchangemail-eme2.itn.ftgroup (unknown [xx.xx.31.31]) by opfedar03.francetelecom.fr (ESMTP service) with ESMTP id 41kg5T2RJtzCqkw; Mon, 6 Aug 2018 16:29:33 +0200 (CEST) Received: from OPEXCLILMA4.corporate.adroot.infra.ftgroup ([fe80::65de:2f08:41e6:ebbe]) by OPEXCLILM22.corporate.adroot.infra.ftgroup ([fe80::8c90:f4e9:be28:2a1%19]) with mapi id 14.03.0399.000; Mon, 6 Aug 2018 16:29:32 +0200 From: To: Alexander Vainshtein CC: "rtg-dir@ietf.org" , "'mpls@ietf.org'" , "'adrian@olddog.co.uk'" , "Jonathan Hardwick (Jonathan.Hardwick@metaswitch.com)" , "shraddha@juniper.net" , "spring@ietf.org" , "spring-chairs@ietf.org" , "draft-ietf-spring-segment-routing-mpls.authors@ietf.org" , Ahmed Bashandy Thread-Topic: RtgDir Early review: draft-ietf-spring-segment-routing-mpls-13 Thread-Index: AdP43xrNCf1Jfn1vTC6lobk7r4STVgHrz2WgASqJaLgE28RsgAAPYoYAARKJ7QAAVldLQAFTpYOAAm6nu1A= Date: Mon, 6 Aug 2018 14:29:31 +0000 Message-ID: <20629_1533565773_5B685B4D_20629_256_1_9E32478DFA9976438E7A22F69B08FF924B2205DC@OPEXCLILMA4.corporate.adroot.infra.ftgroup> References: <46a64bb1-1b17-184c-1089-e05315057236@gmail.com> <8f6b91d0-27de-f92e-6908-598977a05e0d@gmail.com> <32502_1531913237_5B4F2415_32502_461_3_9E32478DFA9976438E7A22F69B08FF924B1FF359@OPEXCLILMA4.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.2] Content-Type: multipart/alternative; boundary="_000_9E32478DFA9976438E7A22F69B08FF924B2205DCOPEXCLILMA4corp_" MIME-Version: 1.0 Archived-At: X-Mailman-Approved-At: Mon, 06 Aug 2018 07:48:19 -0700 Subject: Re: [spring] RtgDir Early review: draft-ietf-spring-segment-routing-mpls-13 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 06 Aug 2018 14:29:44 -0000 --_000_9E32478DFA9976438E7A22F69B08FF924B2205DCOPEXCLILMA4corp_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 PiBGcm9tIG15IFBPViBpbmNsdWRpbmcgdGhlIHNhbWUgKG9yIGVxdWl2YWxlbnQpIGV4cGxpY2l0 IHN0YXRlbWVudCBpbiB0aGUgZHJhZnQgd291bGQgYmUgc3VmZmljaWVudCB0byByZXNvbHZlIHRo ZSBpc3N1ZS4NClNvdW5kcyByZWFzb25hYmxlLg0KDQpCcmdkcywNClN0ZXBoYW5lDQoNCkZyb206 IEFsZXhhbmRlciBWYWluc2h0ZWluIFttYWlsdG86QWxleGFuZGVyLlZhaW5zaHRlaW5AZWNpdGVs ZS5jb21dDQpTZW50OiBXZWRuZXNkYXksIEp1bHkgMjUsIDIwMTggMDk6MjENClRvOiBMSVRLT1dT S0kgU3RlcGhhbmUgT0JTL09JTklTDQpDYzogcnRnLWRpckBpZXRmLm9yZzsgJ21wbHNAaWV0Zi5v cmcnOyAnYWRyaWFuQG9sZGRvZy5jby51ayc7IEpvbmF0aGFuIEhhcmR3aWNrIChKb25hdGhhbi5I YXJkd2lja0BtZXRhc3dpdGNoLmNvbSk7IHNocmFkZGhhQGp1bmlwZXIubmV0OyBzcHJpbmdAaWV0 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<6EB2C14B-6A6F-4DFB-A7B7-154058DEC005@gmail.com> References: <40ED2C86-3403-4D89-8CA8-FBB9651BF2AB@gmail.com> <6dd41180-83bd-c02e-1783-df873e749941@gmail.com> <465981C7-7AB1-43AF-8A80-69D835871077@gmail.com> <8652B1BB-C2E7-4324-8E79-E3092362AE1A@gmail.com> <2120B719-EB92-4A47-A26C-0E2E810F1CA8@gmail.com> To: =?utf-8?Q?Mirja_K=C3=BChlewind?= Archived-At: Subject: Re: [spring] [Tsv-art] TSV-ART review of draft-ietf-spring-segment-routing-msdc-08 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 07 Aug 2018 02:06:04 -0000 --Apple-Mail-24AEE918-DB1D-4BBA-A52C-0D9059E20FCB Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Mirja, Any update ?=20 Cheers, Gaurav Sent from my iPhone > On Aug 3, 2018, at 10:50 AM, Gaurav Dawra wrote: >=20 > Hey Mirja, >=20 > Sorry for the long delay. I was traveling constantly since IETF and bit lo= st in my mailbox and discussion with Authors. Please see my response inline[= Gaurav] >=20 > I think with your changes you addressed explicit problems Martin called ou= t, however, I still have high level concerns about these sections as they ar= e mostly giving speculative recommendation which are not clear to me to work= in practice. >=20 > Regarding section 7.1, you say > "A flowlet is defined as a burst of packets from the same flow followed by= an idle interval." > but then you say > "...then the application can break the elephant flow F into flowlets F1, F2= , F3, F4..." >=20 > This sounds like you would just divide an elephant flow mostly randomly in= to flowlets which can interact badly with the congestion control. If you act= ually have chunks of data that are transmitted with large enough idle interv= al in between (as you define flowlets in the first sentence), that is not an= elephant flow anymore and it will not help you to "spread the load of the e= lephant flow through all the ECMP paths". In summary I actually don't see ho= w the concept of flowlets can be helpful to address the problem you have at a= ll, and I still advise you to remove section 7.1 entirely. > [Gaurav] Hi Mirja, Thanks for the review. The proposal here is no differen= t that current ECMP hashing at flowlet level. The only difference which is b= eing pointed out here is that if we use SR, we could leverage on the ability= of be aware of multiple disjoint paths rather than the hashing. It=E2=80=99= s pins the flowlets to particular paths which is basic SR operations. >=20 > Regarding section 7.2, I also still skeptical about any benefits that can b= e achieved. Given you are in a data center, the controller should already kn= ow about static parameters such as the maximum bandwidth per link. > For dynamic parameters, e.g. like loss rate, measuring them on a per-flow b= ases is the wrong thing to do. What I mean is you can ask a router about the= average loss rate that it observes and that might give you some valuable, h= owever, if you ask a TCP flow about the average loss rate the answer will ma= inly depend on the congestion controller used and the currently available ba= ndwidth, which is a very dynamic property and not a link characteristic. So t= his information is not usable for performance aware routing. A flow could gi= ve you information about the observed RTT (min/max) on a certain path, or th= e maximum available bandwidth on a path, but as I said, given you are in a d= ata center environment these are information that the controller already sho= uld have anyway. > [Gaurav] They are two separate mechanisms. Most DCs have some sort of data= -plane/ECMP aware tracing mechanism to detect the loss/delays and can be com= bined with Application back-off to detect issue. All this section is suggest= ing is that SR can be used to pin the path to particular set of ECMP paths i= nstead of relying on ECMP hashing. >=20 > Your example with detecting a faulty path due to losses does not work with= TCP as you never know if these loses are due to a problem on the path, self= -induced or by a competing flow. And even if you don't use TCP and e.g. send= constant bit rate traffic, there may be a large number of competing TCP flo= ws that can induce the loses. Try to steer traffic "away" on a time-scale th= at is slower than TCP dynamics or even your flow dynamic (when flows start o= r end) in case you have a lot of very short flow, in the best case doesn't w= ork and in the worst case leads to oscillation. > [Gaurav] As I said above, there are other mechanisms to detect loss and tr= ace the path on which loss is seen. This is a common mechanism used in MSDCs= . > =20 > I am happy to discuss further over the phone to try to explain the thought= process. I will also do check again with Authors to update the text or some= thing else based on our conversation. > =20 > Cheers, > =20 > Gaurav >=20 > If you want to make TCP use for handover situation where one path might go= away or become unusable, it's best to use Multipath TCP (with coupled conge= stion control) instead because that works on the right time scale. Again, I d= on't think this is a use case for SR and I would recommend to remove the sec= tion entirely. >=20 > Mirja > =20 >=20 >=20 >> On Mon, Jul 16, 2018 at 11:08 PM, Gaurav Dawra wr= ote: >> Hi Mirja, >>=20 >> Ack. Let me work with authors to close ASAP. >>=20 >> Cheers, >>=20 >> Gaurav >>=20 >> Sent from my iPhone >>=20 >>> On Jul 5, 2018, at 10:06 AM, Mirja K=C3=BChlewind w= rote: >>>=20 >>> Hi Gaurav, >>>=20 >>> sorry for my very long delay but this got somehow a bit lost in my mailb= ox. >>>=20 >>> I think with your changes you addressed explicit problems Martin called o= ut, however, I still have high level concerns about these sections as they a= re mostly giving speculative recommendation which are not clear to me to wor= k in practice. >>>=20 >>> Regarding section 7.1, you say >>> "A flowlet is defined as a burst of packets from the same flow followed b= y an idle interval." >>> but then you say >>> "...then the application can break the elephant flow F into flowlets F1,= F2, F3, F4..." >>>=20 >>> This sounds like you would just divide an elephant flow mostly randomly i= nto flowlets which can interact badly with the congestion control. If you ac= tually have chunks of data that are transmitted with large enough idle inter= val in between (as you define flowlets in the first sentence), that is not a= n elephant flow anymore and it will not help you to "spread the load of t= he elephant flow through all the ECMP paths". In summary I actually don't se= e how the concept of flowlets can be helpful to address the problem you have= at all, and I still advise you to remove section 7.1 entirely. >>>=20 >>> Regarding section 7.2, I also still skeptical about any benefits that ca= n be achieved. Given you are in a data center, the controller should already= know about static parameters such as the maximum bandwidth per link. For dy= namic parameters, e.g. like loss rate, measuring them on a per-flow bases is= the wrong thing to do. What I mean is you can ask a router about the averag= e loss rate that it observes and that might give you some valuable, however,= if you ask a TCP flow about the average loss rate the answer will mainly de= pend on the congestion controller used and the currently available bandwidth= , which is a very dynamic property and not a link characteristic. So this in= formation is not usable for performance aware routing. A flow could give you= information about the observed RTT (min/max) on a certain path, or the maxi= mum available bandwidth on a path, but as I said, given you are in a data ce= nter environment these are information that the controller already should ha= ve anyway. >>>=20 >>> Your example with detecting a faulty path due to losses does not work wi= th TCP as you never know if these loses are due to a problem on the path, se= lf-induced or by a competing flow. And even if you don't use TCP and e.g. se= nd constant bit rate traffic, there may be a large number of competing TCP f= lows that can induce the loses. Try to steer traffic "away" on a time-scale t= hat is slower than TCP dynamics or even your flow dynamic (when flows start o= r end) in case you have a lot of very short flow, in the best case doesn't w= ork and in the worst case leads to oscillation. >>>=20 >>> If you want to make TCP use for handover situation where one path might g= o away or become unusable, it's best to use Multipath TCP (with coupled cong= estion control) instead because that works on the right time scale. Again, I= don't think this is a use case for SR and I would recommend to remove the s= ection entirely. >>>=20 >>> Mirja >>>=20 >>>=20 >>>> On 05.07.2018 04:08, Gaurav Dawra wrote: >>>> Hey Alvaro, Mirja,=20 >>>>=20 >>>> Friendly reminder to further progress this document. >>>>=20 >>>> Cheers, >>>>=20 >>>> Gaurav >>>>=20 >>>>> On Mon, Jun 18, 2018 at 5:13 PM, Gaurav Dawra = wrote: >>>>> Hi Alvaro, Mirja=20 >>>>>=20 >>>>> Any feedback or next steps to close this? >>>>>=20 >>>>> Cheers, >>>>>=20 >>>>> Gaurav >>>>>=20 >>>>> Sent from my iPhone >>>>>=20 >>>>> On Jun 12, 2018, at 7:06 AM, Gaurav Dawra wrot= e: >>>>>=20 >>>>>> Hi Mirja, >>>>>>=20 >>>>>> Friendly Reminder...Could you please also advice if there is anything= further to DISCUSS on this document which was also related to TCP updates b= elow? >>>>>>=20 >>>>>> Cheers, >>>>>>=20 >>>>>> Gaurav >>>>>>=20 >>>>>> On Thu, Jun 7, 2018 at 9:02 AM, Alvaro Retana wrote: >>>>>>> Thanks Martin! >>>>>>>=20 >>>>>>>> On June 6, 2018 at 3:14:45 PM, Martin = Stiemerling (mls.ietf@gmail.com) wrote: >>>>>>>>=20 >>>>>>>> Hi Alvaro, all,=20 >>>>>>>>=20 >>>>>>>> Thanks for addressing my concerns.=20 >>>>>>>>=20 >>>>>>>> This version is good to go from my side.=20 >>>>>>>>=20 >>>>>>>> Kind regards,=20 >>>>>>>>=20 >>>>>>>> ;Martin=20 >>>>>>>>=20 >>>>>>>> Am 30.05.18 um 21:55 schrieb Alvaro Retana:=20 >>>>>>>> > Martin:=20 >>>>>>>> > br/>> Hi!! How are you?=20 >>>>>>>> > br/>> Gaurav just posted a revision. Please takke a look and let= us know if br/>> the changes address your concerrns or not.=20 >>>>>>>> > br/>> https://www.ietf.org/rfcdiff??url2=3Ddraft-ietf-spring-segm= ent-routing-msdc-09=20 >>>>>>>> > br/>> Thanks!!!=20 >>>>>>>> > br/>> Alvaro. <=20 >>>>>>>> > br/>> On May 25, 2018 at 12:08:46 PM, Gaurav Dawra ((gdawra.ietf@= gmail.com br/>> ) wrote:=20 >>>>>>>> > br/>>> Hi Martin, <=20 >>>>>>>> >>=20 >>>>>>>> >> Thanks for review. I will post the new version. Hopefully, it wi= ll br/>>> address all your comments and we can close thhis review.=20 >>>>>>>> >>=20 >>>>>>>> >> Any updates on below response?=20 >>>>>>>> >>=20 >>>>>>>> >> Cheers,=20 >>>>>>>> >>=20 >>>>>>>> >> Gaurav=20 >>>>>>>> >>=20 >>>>>>>> >> Sent from my iPhone=20 >>>>>>>> >>=20 >>>>>>>> >> On May 23, 2018, at 4:17 AM, Gaurav Dawra >> > wrote:=20 >>>>>>>> >>=20 >>>>>>>> >>> Hi Martin,=20 >>>>>>>> >>>=20 >>>>>>>> >>> Thanks for the review. Any further comments here ? I will post t= he br/>>>> new version soon. <=20 >>>>>>>> >>>=20 >>>>>>>> >>> Cheers,=20 >>>>>>>> >>>=20 >>>>>>>> >>> Gaurav=20 >>>>>>>> >>>=20 >>>>>>>> >>> Sent from my iPhone=20 >>>>>>>> >>>=20 >>>>>>>> >>> On May 16, 2018, at 7:44 PM, Gaurav Dawra >>> > wrote:=20 >>>>>>>> >>>=20 >>>>>>>> >>>> Hi Martin,=20 >>>>>>>> >>>>=20 >>>>>>>> >>>> Apologies from my end we had few internal authors conversation= s on br/>>>>> the points you have raised. <=20 >>>>>>>> >>>>=20 >>>>>>>> >>>> Please find below my response. I will be happy to discuss furt= her, br/>>>>> if needed. <=20 >>>>>>>> >>>>=20 >>>>>>>> >>>> inline...=20 >>>>>>>> >>>>=20 >>>>>>>> >>>>> On Apr 9, 2018, at 7:58 AM, Martin Stiemerling >>>>> > wrote:=20 >>>>>>>> >>>>>=20 >>>>>>>> >>>>> Hi Gaurav,=20 >>>>>>>> >>>>>=20 >>>>>>>> >>>>> This got lost on my end, sorry for this. The filter just move= d br/>>>>>> these messages out of my sight... :-/=20 >>>>>>>> >>>>>=20 >>>>>>>> >>>>> Am 15.02.18 um 05:47 schrieb Gaurav Dawra:=20 >>>>>>>> >>>>>> Hey Martin,=20 >>>>>>>> >>>>>> Sorry for late reply. Please see some comments inline[Gaurav= ]=20 >>>>>>>> >>>>>>> On Jan 9, 2018, at 2:25 PM, Martin Stiemerling br/>>>>>>>> <= mls.ietf@@gmail.com br/>>>>>>>>; > wrote:=20 >>>>>>>> >>>>>>>=20 >>>>>>>> >>>>>>> Hi all,=20 >>>>>>>> >>>>>>>=20 >>>>>>>> >>>>>>> I've reviewed this document as part of the transport area r= eview br/>>>>>>>> team's ongoing effort to review key IETF documents. These b= r/>>>>t;>>>> comments were written primarily for the transport area = directors, br/>>>>>>>> but are copied to t= he doocument's authors for their information br/>>>>>>>&> and to allow them t= o address any issues raised. When done at the=20 >>>>>>>> >>>>>>> time of IETF Last Call, the authors should consider this re= view br/>>>>>>>> together with any other last-call comments they receive. Pl= ease br/>>>&>>>>> always CC tsv-art@=E2=80=A6 if you reply to or forward thi= s review.=20 >>>>>>>> >>>>>>>=20 >>>>>>>> >>>>>>> Summary:=20 >>>>>>>> >>>>>>> This draft has serious issues in Section 7..1, 7.2 and in o= ne part br/>>>>>>>> of Secction3, described in the review, and needs to be r= ethought. br/>>&>>>>>> The other sections are good AFAIK.=20 >>>>>>>> >>>>>>>=20 >>>>>>>> >>>>>>>=20 >>>>>>>> >>>>>>> Technicals:=20 >>>>>>>> >>>>>>> The overall draft looks ok, but the three points below look= br/>>>>>>>> strange and need a fix before publication IMHO:=20 >>>>>>>> >>>>>>>=20 >>>>>>>> >>>>>>> Both Sections, 7.1. and 7.2., are describing ideas, but not= well br/>>>>>>>> proven funcationality and not even safe to use functionali= ty. br/>>>&>>>>> Both are some sort discussing that different paths in the n= etwork br/>>>>>>>> could be used by the eend host traffic. This sounds prett= y much br/>>>>>>>t;> like the Path Aware Networking Proposed Research Grou= p br/>>t;>>>>>> (https://irtf.org/panrg) and hints to the fact that there i= s no br/>>>>>>>> commonly understannd and accepted engineering solution in t= his space.=20 >>>>>>>> >>>>>>>=20 >>>>>>>> >>>>>>> Section 7.1:=20 >>>>>>>> >>>>>>> [KANDULA04] is a really old = reference that hasn't been followed br/>>>>>>>> up iin recent times= and even worse there is no evidence that this br/>>t;>>>>>> is going to w= ork good enough or stable enough under real Internet br/>>>>>>>> traffic. Ad= ditioonally, it is more than unclear how any modern TCP br/>>>>&ggt;>>> impl= ementation will react to this=20 >>>>>>>> >>>>>> [Gaurav] Will get back on this.=20 >>>>>>>> >>>>>=20 >>>>>>>> >>>>> I will reply to the other email dicussing this.=20 >>>>>>>> >>>> I have replied to other thread.=20 >>>>>>>> >>>>>=20 >>>>>>>> >>>>>>>=20 >>>>>>>> >>>>>>> Section 7.2:=20 >>>>>>>> >>>>>>> This section describes an idea without detailing too much a= bout br/>>>>>>>> any furtther aspects. Further it changes the commonly accep= ted br/>>>;>>>>> notion of what an end host can do with the network. At best= this br/>>>>>>>> would require a good ddefinition of what an end host in yo= ur br/>>>>>>>&ggt; setting is, e.g., a highly modified piece of (at least) s= oftware=20 >>>>>>>> >>>>>>> that usually not found in OS availble on the market (yet?)=20= >>>>>>>> >>>>>>> Further communicating instantaneous path characteristics to= a br/>>>>>>>> central point is potentially a bad idea, as the data is alrea= dy br/>>>;>>>>> outdated when reported by any node.=20 >>>>>>>> >>>>>> [Gaurav] I believe Authors are = trying to highlight that Host which br/>>>>>>> is defineed in br/= >>>>>>> (https://tools.ietf.org/html/draftt-ietf-spring-segment-routing-15) b= r/>>>>>>> can innfluence the traffic based on the Calculations locally or br= />>>t;>>>> jointly with the controller. Implementations can decide how muc= h br/>>>>>>> Centralized -vs- localized coontrol is allowed at Host based on= br/>>>>>>> perfoormance data collec= tion.=20 >>>>>>>> >>>>>=20 >>>>>>>> >>>>> Performance data collection (monitoring?) isn't crucial when i= t br/>>>>>> comes to timely (actuaally real-time) reaction. However, this br= />>>>>> secttion isn't just about performance data collection as it is about= br/>>>>>>> "Performance-aware routing" this seems to try to interact in br/= >>>>>> real-time with the network behhavior of TCP. This isn't even close br= />>>>>> to acceeptable.=20 >>>>>>>> >>>>>=20 >>>>>>>> >>>>> I would be ok to say that it is useful to collect performance= data br/>>>>>> for offline analysis and improvement of the data network. Ho= wever, br/>>>>>&ggt; this is at completely different magnitues of time scale= s.=20 >>>>>>>> >>>>>=20 >>>>>>>> >>>>> I would recommend to remove the TCP part from this section en= tirely. =20 >>>>>>>> >>>> Ack, will update in next rev:=20 >>>>>>>> >>>>=20 >>>>>>>> >>>> Section will read like this:=20 >>>>>>>> >>>>=20 >>>>>>>> >>>> ;=20 >>>>>>>> >>>> /Knowing the path associated with flows/packets, the end host m= ay/=20 >>>>>>>> >>>> /deduce certain characteristics of the path on its own, and/=20= >>>>>>>> >>>> /additionally use the information supplied with path informati= on/=20 >>>>>>>> >>>> /pushed from the controller or received via pull request. The h= ost/=20 >>>>>>>> >>>> /may further share its path observations with the centralized a= gent,/=20 >>>>>>>> >>>> /so that the latter may keep up-to-date network health map to a= ssist/=20 >>>>>>>> >>>> /other hosts with this information./=20 >>>>>>>> >>>> //=20 >>>>>>>> >>>> /For example, an application A.1 at HostA may pin a flow desti= ned/=20 >>>>>>>> >>>> /to HostZ via Spine node Node5 using label stack {16005, 16011= }. The/=20 >>>>>>>> >>>> /application A.1 may collect information on packet loss, deduc= ed from/=20 >>>>>>>> >>>> /Other offline mechanisms. [There are some pingMesh mechanisms= which /=20 >>>>>>>> >>>> /Can be used here]/=20 >>>>>>>> >>>> /Through these mechanisms information to a centralized agent, e= .g./=20 >>>>>>>> >>>> /after a flow completes, or periodically for longer lived flow= s./=20 >>>>>>>> >>>> /Next, using both local and/or global performance data, applic= ation/=20 >>>>>>>> >>>> /A.1 as well as other applications sharing the same resources i= n the/=20 >>>>>>>> >>>> /DC fabric may pick up the best path for the new flow, or upda= te an/=20 >>>>>>>> >>>> /existing path (e.g.: when informed of congestion on an existi= ng/ =20 >>>>>>>> >>>> /path)./=20 >>>>>>>> >>>> ;=20 >>>>>>>> >>>>=20 >>>>>>>> >>>>>=20 >>>>>>>> >>>>>=20 >>>>>>>> >>>>>>>=20 >>>>>>>> >>>>>>> Section 3, 3rd bullet point:=20 >>>>>>>> >>>>>>> It is the foundation of TCP that the network is regarded as= a br/>>>>>>>> black box and that you infer from the transmission of packets= br/>>>>;>>>> what the current state of the network path is. Inferring netwo= rk br/>>>>>>>> path metrics (you mention SRTT, MSS, CWND ) is a bad idea, as= br/>>>>>>>>; this would required that all paths exhibit this and if not wha= t br//>>>>>>>> is going to happen?=20 >>>>>>>> >>>>>>> It could be an interesting research field to change many po= ints br/>>>>>>>> in TCP'ss behavior, but this once again points to the fact t= hat br/>>>&>>>>> this not the IETF works but IRTF or elsewhere.=20 >>>>>>>> >>>>>> [Gaurav] Martin, Authors are trying to suggest that TCP is r= ightly br/>>>>>>> treating Network as Black Box. Authors are implying per pa= th br/>>>>;>>> performance metrics as not cached. Is there some change in te= xt br/>>>>>>> you are suggesting??=20 >>>>>>>> >>>>>=20 >>>>>>>> >>>>>=20 >>>>>>>> >>>>> I would recommend to remove the 3rd bullet point completey. T= CP br/>>>>>> isn't the place to rememmber "good" or "bad" paths. This is br/= >>>>>> something the network could decide, e.g., rerouting TCP flows br/>&gg= t;>>>> within the network or changing the forwarding path in the network br/= >>>>>> for particular flows (if it is not routed).=20 >>>>>>>> >>>>=20 >>>>>>>> >>>> Ack, after discussion, we will remove the Section 3 -= 3rd br/>>>>> bullet point. Willl update in next rev - coming shortly.=20 >>>>>>>> >>>>=20 >>>>>>>> >>>>>=20 >>>>>>>> >>>>> Kind regards,=20 >>>>>>>> >>>>>=20 >>>>>>>> >>>>> Martin=20 >>>>>>>> >>>>>=20 >>>>>>>> >>>>=20 >>>>>>=20 >>>>=20 >>>>=20 >>>>=20 >>>> _______________________________________________ >>>> Tsv-art mailing list >>>> Tsv-art@ietf.org >>>> https://www.ietf.org/mailman/listinfo/tsv-art >>>=20 >=20 --Apple-Mail-24AEE918-DB1D-4BBA-A52C-0D9059E20FCB Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Mirja,

Any update ?&n= bsp;

Cheers,

Gaurav
Sent from my iPhone

On Aug 3, 2= 018, at 10:50 AM, Gaurav Dawra <= gdawra.ietf@gmail.com> wrote:

=
Hey Mirja,

Sorry for the long delay= . I was traveling constantly since IETF and bit lost in my mailbox and discu= ssion with Authors. Please see my response inline[Gaurav]


I think with your changes you addressed exp= licit problems Martin called out, however, I still have high level concerns a= bout these sections as they are mostly giving speculative recommendation whi= ch are not clear to me to work in practice.

Regarding section 7.1, you say
"A flowlet is defined as a burst of packets= from the same flow followed by an idle interval."
but then you say
"...then the application can break the elep= hant flow F into flowlets F1, F2, F3, F4..."

This sounds like you would just divide an e= lephant flow mostly randomly into flowlets which can interact badly with the= congestion control. If you actually have chunks of data that are transmitte= d with large enough idle interval in between (as you define flowlets in the f= irst sentence), that is not an elephant flow anymore and it will not help yo= u to "spread the load of the elephant flow through all the ECMP paths". In s= ummary I actually don't see how the concept of flowlets can be helpful to ad= dress the problem you have at all, and I still advise you to remove section 7= .1 entirely.

[Gaurav] Hi Mirja= , Thanks for the review. The proposal here is no differen= t that current ECMP hashing at flowlet level. The only difference which is b= eing pointed out here is that if we use SR, we could leverage on the ability= of be aware of multiple disjoint paths rather than the hashing. It=E2=80=99= s pins the flowlets to particular paths which is basic SR operations.

Regarding section 7.2, I also still skeptic= al about any benefits that can be achieved. Given you are in a data center, t= he controller should already know about static parameters such as the maximu= m bandwidth per link.

For dynamic param= eters, e.g. like loss rate, measuring them on a per-flow bases is the wrong t= hing to do. What I mean is you can ask a router about the average loss rate t= hat it observes and that might give you some valuable, however, if you ask a= TCP flow about the average loss rate the answer will mainly depend on the c= ongestion controller used and the currently available bandwidth, which is a v= ery dynamic property and not a link characteristic. So this information is n= ot usable for performance aware routing. A flow could give you information a= bout the observed RTT (min/max) on a certain path, or the maximum available b= andwidth on a path, but as I said, given you are in a data center environmen= t these are information that the controller already should have anyway.

[Gaurav] They are= two separate mechanisms. Most DCs have some sort of data= -plane/ECMP aware tracing mechanism to detect the loss/delays and can be com= bined with Application back-off to detect issue. All this section is suggest= ing is that SR can be used to pin the path to particular set of ECMP paths i= nstead of relying on ECMP hashing.

Your example with detecting a faulty path d= ue to losses does not work with TCP as you never know if these loses are due= to a problem on the path, self-induced or by a competing flow. And even if y= ou don't use TCP and e.g. send constant bit rate traffic, there may be a lar= ge number of competing TCP flows that can induce the loses. Try to steer tra= ffic "away" on a time-scale that is slower than TCP dynamics or even your fl= ow dynamic (when flows start or end) in case you have a lot of very short fl= ow, in the best case doesn't work and in the worst case leads to oscillation= .

[Gaurav] As I said above, there are other mechanisms to detect loss and tr= ace the path on which loss is seen. This is a common mechanism used in MSDCs= .

 

I am happy to discuss further over= the phone to try to explain the thought process. I will also do check again= with Authors to update the text or something else based on our conversation= .

 

Cheers,<= /p>

 

Gaurav

If you want to make TCP use for handover si= tuation where one path might go away or become unusable, it's best to use Mu= ltipath TCP (with coupled congestion control) instead because that works on t= he right time scale. Again, I don't think this is a use case for SR and I wo= uld recommend to remove the section entirely.

Mirja

 



On= Mon, Jul 16, 2018 at 11:08 PM, Gaurav Dawra <gdawra.ietf@gmail.com&g= t; wrote:
Hi Mirja,=

Ack. Let me work with authors to close ASAP.

Cheers,

Gaurav

Sent from my iPhone

On Jul 5, 2018, at 10:06 AM, Mirja K=C3= =BChlewind <ietf= @kuehlewind.net> wrote:

=20 =20 =20 =20 Hi Gaurav,

sorry for my very long delay but this got somehow a bit lost in my mailbox.

I think with your changes you addressed explicit problems Martin called out, however, I still have high level concerns about these sections as they are mostly giving speculative recommendation which are not clear to me to work in practice.

Regarding section 7.1, you say
"A flowlet is defined as a burst of packets from the same flow followed by an idle interval."
but then you say
"...then the application can break the elephant flow F into flowlets F1, F2, F3, F4..."

This sounds like you would just divide an elephant flow mostly randomly into flowlets which can interact badly with the congestion control. If you actually have chunks of data that are transmitted with large enough idle interval in between (as you define flowlets in the first sentence), that is not an elephant flow anymore and it will not help you to "spread the load of the elephant flow through all the ECMP paths". In summary I actually don't see how the concept of flowlets can be helpful to address the problem you have at all, and I still advise you to remove section 7.1 entirely.

Regarding section 7.2, I also still skeptical about any benefits that can be achieved. Given you are in a data center, the controller should already know about static parameters such as the maximum bandwidth per link. For dynamic parameters, e.g. like loss rate, measuring them on a per-flow bases is the wrong thing to do. What I mean is you can ask a router about the average loss rate that it observes and that might give you some valuable, however, if you ask a TCP flow about the average loss rate the answer will mainly depend on the congestion controller used and the currently available bandwidth, which is a very dynamic property and not a link characteristic. So this information is not usable for performance aware routing. A flow could give you information about the observed RTT (min/max) on a certain path, or the maximum available bandwidth on a path, but as I said, given you are in a data center environment these are information that the controller already should have anyway.

Your example with detecting a faulty path due to losses does not work with TCP as you never know if these loses are due to a problem on the path, self-induced or by a competing flow. And even if you don't use TCP and e.g. send constant bit rate traffic, there may be a large number of competing TCP flows that can induce the loses. Try to steer traffic "away" on a time-scale that is slower than TCP dynamics or even your flow dynamic (when flows start or end) in case you have a lot of very short flow, in the best case doesn't work and in the worst case leads to oscillation.

If you want to make TCP use for handover situation where one path might go away or become unusable, it's best to use Multipath TCP (with coupled congestion control) instead because that works on the right time scale. Again, I don't think this is a use case for SR and I would recommend to remove the section entirely.

Mirja


On 05.07.2018 04:08= , Gaurav Dawra wrote:
Hey Alvaro, Mirja, 

Friendly reminder to further progress this document.

Cheers,

Gaurav

On Mon, Jun 18, 2018 at 5:13 PM, Gaurav Dawra <gdawra.ietf@gmail.com> wrote:
Hi Alvaro, Mirja 

Any feedback or next steps to close this?

Cheers,

Gaurav

Sent from my iPhone

On Jun 12, 2018, at 7:06 AM, Gaurav Dawra <gdawra.ietf@gmail.com&g= t; wrote:

Hi Mirja,

Friendly Reminder...Could you please also advice if there is anything further to DISCUSS on this document which was also related to TCP updates below?

Cheers,

Gaurav

On Thu, Jun 7, 2018 at 9:02 AM, Alvaro Retana &l= t;aretana.ietf@g= mail.com> wrote:

= Thanks Martin!


On June 6, 2018 at 3:14:45 PM, Martin Stiemerling (mls.ietf@gmail.com) wrote:
Hi Alvaro, all,

Thanks for addressing my concerns.

This version is good to go from my side.

Kind regards,

;Martin

Am 30.05.18 um 21:55 schrieb Alvaro Retana:
> Martin:
> br/>> Hi!!  How are you?
> br/>> Gaurav just posted a revision.  Please takk= e a look and let us know if br/>> the changes address your concerrns or not.
> br/>> https://www.ietf.org/rfcdiff??url2=3Ddraft-ietf-spring-se= gment-routing-msdc-09
> br/>> Thanks!!!
> br/>> Alvaro. <
> br/>> On May 25, 2018 at 12:08:46 PM, Gaurav Dawra ((gdawra.ietf@gmail.com<= /a> br/>> <mailto:gdawra.ietf@@gmail.com>) wrote:
> br/>>> Hi Martin, <
>>
>> Thanks for review. I will post the new version. Hopefully, it will br/>>> address all your comments and we can close thhis review.
>>
>> Any updates on below response?
>>
>> Cheers,
>>
>> Gaurav
>>
>> Sent from my iPhone
>>
>> On May 23, 2018, at 4:17 AM, Gaurav Dawra <gdawra.ietf@gmail.com br/>>> <mailto:gdawra.ietf@@gmail.com>> wrote:
>>
>>> Hi Martin,
>>>
>>> Thanks for the review. Any further comments here ? I will post the br/>>>> new version soon. <
>>>
>>> Cheers,
>>>
>>> Gaurav
>>>
>>> Sent from my iPhone
>>>
>>> On May 16, 2018, at 7:44 PM, Gaurav Dawra <gdawra.ietf@gmail.com br/>>>> <mailto:gdawra.ietf@@gmail..com>> wrote:
>>>
>>>> Hi Martin,
>>>>
>>>> Apologies from my end we had few internal authors conversations on br/>>>>> the points you have raised. <
>>>>
>>>> Please find below my response. I will be happy to discuss further, br/>>>>> if needed. <
>>>>
>>>> <Gaurav> inline...
>>>>
>>>>> On Apr 9, 2018, at 7:58 AM, Martin Stiemerling <mls.ietf@gmail.com br/>>>>>> <mailto:mls.iietf@gmail.com>> wrote:
>>>>>
>>>>> Hi Gaurav,
>>>>>
>>>>> This got lost on my end, sorry for this. The filter just moved br/>>>>>> these messages out of my sight... :-/
>>>>>
>>>>> Am 15.02.18 um 05:47 schrieb Gaurav Dawra:
>>>>>> Hey Martin,
>>>>>> Sorry for late reply. Please see some comments inline[Gaurav]
>>>>>>= ;> On Jan 9, 2018, at 2:25 PM, Martin Stiemerling br/>>>>>>>>= ; <mls.ietf@@gmail.com <mailto:mls.ietf@gmail.com> br/>>>>>>>>; <mailto:mls.ietf@gmail.com>> wrote:
>>>>>>>
>>>>>>> Hi all,
>>>>>>>
>>>>>>> I've reviewed this document as part of the transport area review br/>>>>>>>> team's ongoing effort to review key IETF documents. These br/>>>&gtt;>>>= > comments were written primarily for the transport area directors, br/>>>>>>>> but are copied to the doocument's authors for their information br/>>>>>>>&= > and to allow them to address any issues raised. When done at the
>>>>>>> time of IETF Last Call, the authors should consider this review br/>>>>>>>> together with any other last-call comments they receive. Please br/>>>&>>>>= > always CC tsv-art@=E2=80=A6 if you r= eply to or forward this review.
>>>>>>>
>>>>>>> Summary:
>>>>>>> This draft has serious issues in Section 7..1, 7.2 and in one part br/>>>>>>>> of Secction3, described in the review, and needs to be rethought. br/>>&>>>>>= > The other sections are good AFAIK.
>>>>>>>
>>>>>>>
>>>>>>> Technicals:
>>>>>>> The overall draft looks ok, but the three points below look br/>>>>>>>> strange and need a fix before publication IMHO:
>>>>>>>
>>>>>>> Both Sections, 7.1. and 7.2., are describing ideas, but not well br/>>>>>>>> proven funcationality and not even safe to use functionality. br/>>>&>>>>> Both are some sort discussing that different paths in the network br/>>>>>>>> could be used by the eend host traffic. This sounds pretty much br/>>>>>>&gtt;> like the Path Aware Networking Proposed Research Group br/>&gtt;>>>>>= > (https://irtf.org/panrg) and hints to the fact that there is no br/>>>>>>>> commonly understannd and accepted engineering solution in this space.
>>>>>>>
>>>>>>> Section 7.1:
>>>>>>> [KANDULA04] is a really old reference that hasn't been followed br/>>>>>>>> up iin recent times and even worse there is no evidence that this br/>&gtt;>>>>>= > is going to work good enough or stable enough under real Internet br/>>>>>>>> traffic. Additioonally, it is more than unclear how any modern TCP br/>>>>&ggt;>>= > implementation will react to this
>>>>>> [Gaurav] Will get back on this.
>>>>>
>>>>> I will reply to the other email dicussing this.
>>>> <Gaurav> I have replied to other thread.
>>>>>
>>>>>>>
>>>>>>> Section 7.2:
>>>>>>> This section describes an idea without detailing too much about br/>>>>>>>> any furtther aspects. Further it changes the commonly accepted br/>>>;>>>>>= notion of what an end host can do with the network. At best this br/>>>>>>>> would require a good ddefinition of what an end host in your br/>>>>>>>&= ggt; setting is, e.g., a highly modified piece of (at least) software
>>>>>>> that usually not found in OS availble on the market (yet?)
>>>>>>> Further communicating instantaneous path characteristics to a br/>>>>>>>> central point is potentially a bad idea, as the data is already br/>>>;>>>>> outdated when reported by any node.
>>>>>> [Gaurav] I believe Authors are trying to highlight that Host which br/>>>>>>> is defineed in br/>>>>>>> (https://tools.i= etf.org/html/draftt-ietf-spring-segment-routing-15) br/>>>>>>> can innfluence the traffic based on the Calculations locally or br/>>&gtt;>>>>= jointly with the controller. Implementations can decide how much br/>>>>>>> Centralized -vs- localized coontrol is allowed at Host based on br/>>>>>>> perfoormance data collection.
>>>>>
>>>>> Performance data collection (monitoring?) isn't crucial when it br/>>>>>> comes to timely (actuaally real-time) reaction. However, this br/>>>>>> secttion isn't just about performance data collection as it is about br/>>>>>>> "Performance-aware routing" this seems to try to interact in br/>>>>>> real-time with the network behhavior of TCP. This isn't even close br/>>>>>> to acceeptable.
>>>>>
>>>>> I would be ok to say that it is useful to collect performance data br/>>>>>> for offline analysis and improvement of the data network. However, br/>>>>>&ggt; this is at completely different magnitues of time scales.
>>>>>
>>>>> I would recommend to remove the TCP part from this section entirely.
>>>> <Gaurav>Ack, will update in next rev:
>>>>
>>>> Section will read like this:
>>>>
>>>> ;
>>>> /Knowing the path associated with flows/packets, the end host may/
>>>> /deduce certain characteristics of the path on its own, and/
>>>> /additionally use the information supplied with path information/
>>>> /pushed from the controller or received via pull request. The host/
>>>> /may further share its path observations with the centralized agent,/
>>>> /so that the latter may keep up-to-date network health map to assist/
>>>> /other hosts with this information./
>>>> //
>>>> /For example, an application A.1 at HostA may pin a flow destined/
>>>> /to HostZ via Spine node Node5 using label stack {16005, 16011}. The/
>>>> /application A.1 may collect information on packet loss, deduced from/
>>>> /Other offline mechanisms. [There are some pingMesh mechanisms which /
>>>> /Can be used here]/
>>>> /Through these mechanisms information to a centralized agent, e.g./
>>>> /after a flow completes, or periodically for longer lived flows./
>>>> /Next, using both local and/or global performance data, application/
>>>> /A.1 as well as other applications sharing the same resources in the/
>>>> /DC fabric may pick up the best path for the new flow, or update an/
>>>> /existing path (e.g.: when informed of congestion on an existing/
>>>> /path)./
>>>> ;
>>>>
>>>>>
>>>>>
>>>>>>>
>>>>>>> Section 3, 3rd bullet point:
>>>>>>> It is the foundation of TCP that the network is regarded as a br/>>>>>>>> black box and that you infer from the transmission of packets br/>>>>;>>>> what the current state of the network path is. Inferring network br/>>>>>>>> path metrics (you mention SRTT, MSS, CWND ) is a bad idea, as br/>>>>>>>>;= this would required that all paths exhibit this and if not what br//>>>>>>>>= is going to happen?
>>>>>>> It could be an interesting research field to change many points br/>>>>>>>> in TCP'ss behavior, but this once again points to the fact that br/>>>&>>>>= > this not the IETF works but IRTF or elsewhere.
>>>>>> [Gaurav] Martin, Authors are trying to suggest that TCP is rightly br/>>>>>>> treating Network as Black Box. Authors are implying per path br/>>>>;>>> performance metrics as not cached. Is there some change in text br/>>>>>>> you are suggesting??
>>>>>
>>>>>
>>>>> I would recommend to remove the 3rd bullet point completey. TCP br/>>>>>> isn't the place to rememmber "good" or "bad" paths. This is br/>>>>>> something the network could decide, e.g., rerouting TCP flows br/>&ggt;>>>> within the network or changing the forwarding path in the network br/>>>>>> for particular flows (if it is not routed).
>>>>
>>>> <Gaurav> Ack, after discussion, we will remove the Section 3 - 3rd br/>>>>> bullet point. Willl update in next rev= - coming shortly.
>>>>
>>>>>
>>>>> Kind regards,
>>>>>
>>>>>  Martin
>>>>>
>>>> 




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= --Apple-Mail-24AEE918-DB1D-4BBA-A52C-0D9059E20FCB-- From nobody Thu Aug 9 08:30:32 2018 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 694BC130E3F for ; Thu, 9 Aug 2018 08:30:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); domainkeys=pass (1024-bit key) header.from=ietf@kuehlewind.net header.d=kuehlewind.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0xOZkUZxWf9e for ; Thu, 9 Aug 2018 08:30:26 -0700 (PDT) Received: from kuehlewind.net (kuehlewind.net [83.169.45.111]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0428E130E23 for ; Thu, 9 Aug 2018 08:30:24 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=default; d=kuehlewind.net; b=J1/ak031aVmIZSz6wUagl629w+1JnHFcPCD//JkT+rzezrecQcHovOD3SnjrGlo6UoZqHwF04iN4GdKjR7nlbjRXXT7+THnVaZ8cWupRZ5AN9GuFagKS6seQH9s0QtC3ZiWJrAoZrrzvR5G5gZtxE0dWCESt3XbtkG8TFHf3yGk=; h=Received:Received:Subject:To:Cc:References:From:Message-ID:Date:User-Agent:MIME-Version:In-Reply-To:Content-Type:Content-Language:X-PPP-Message-ID:X-PPP-Vhost; Received: (qmail 31788 invoked from network); 9 Aug 2018 17:29:20 +0200 Received: from nb-10688.ethz.ch (HELO ?82.130.103.20?) (82.130.103.20) by kuehlewind.net with ESMTPSA (DHE-RSA-AES128-SHA encrypted, authenticated); 9 Aug 2018 17:29:20 +0200 To: Gaurav Dawra Cc: Alvaro Retana , Martin Stiemerling , SPRING WG , tsv-art@ietf.org References: <40ED2C86-3403-4D89-8CA8-FBB9651BF2AB@gmail.com> <6dd41180-83bd-c02e-1783-df873e749941@gmail.com> <465981C7-7AB1-43AF-8A80-69D835871077@gmail.com> <8652B1BB-C2E7-4324-8E79-E3092362AE1A@gmail.com> <2120B719-EB92-4A47-A26C-0E2E810F1CA8@gmail.com> From: =?UTF-8?Q?Mirja_K=c3=bchlewind?= Message-ID: <3b257a8a-0455-cd1b-6e95-0e03ab3f1830@kuehlewind.net> Date: Thu, 9 Aug 2018 17:29:20 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------162CB3186DFFD3FBEADF9B24" Content-Language: en-US X-PPP-Message-ID: <20180809152920.31780.72325@lvps83-169-45-111.dedicated.hosteurope.de> X-PPP-Vhost: kuehlewind.net Archived-At: Subject: Re: [spring] [Tsv-art] TSV-ART review of draft-ietf-spring-segment-routing-msdc-08 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 09 Aug 2018 15:30:31 -0000 This is a multi-part message in MIME format. --------------162CB3186DFFD3FBEADF9B24 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Hi Gaurav, please see inline. On 03.08.2018 07:20, Gaurav Dawra wrote: > Hey Mirja, > > Sorry for the long delay. I was traveling constantly since IETF and > bit lost in my mailbox and discussion with Authors. Please see my > response inline[Gaurav] > > _ > I think with your changes you addressed explicit problems Martin > called out, however, I still have high level concerns about these > sections as they are mostly giving speculative recommendation which > are not clear to me to work in practice. > > Regarding section 7.1, you say _ > "A flowlet is defined as a burst of packets from the same flow > followed by an idle interval." > _but then you say _ > "...then the application can break the elephant flow F into flowlets > F1, F2, F3, F4..." > > This sounds like you would just divide an elephant flow mostly > randomly into flowlets which can interact badly with the congestion > control. If you actually have chunks of data that are transmitted with > large enough idle interval in between (as you define flowlets in the > first sentence), that is not an elephant flow anymore and it will not > help you to "spread the load of the elephant flow through all the ECMP > paths". In summary I actually don't see how the concept of flowlets > can be helpful to address the problem you have at all, and I still > advise you to remove section 7.1 entirely. > > _[Gaurav] Hi Mirja, Thanks for the review. _The proposal here is no > different that current ECMP hashing at flowlet level. The only > difference which is being pointed out here is that if we use SR, we > could leverage on the ability of be aware of multiple disjoint paths > rather than the hashing. It’s pins the flowlets to particular paths > which is basic SR operations. > Yes the problem is that we usually don't recommend ECMP hashing on flowlet level because it can interact badly with the end-end mechanisms of that flow. As I said, I don't see how the notion of flowlets help you problem and therefore I still recommend to remove that paragraph. > _ > Regarding section 7.2, I also still skeptical about any benefits that > can be achieved. Given you are in a data center, the controller should > already know about static parameters such as the maximum bandwidth per > link. > > _For dynamic parameters, e.g. like loss rate, measuring them on a > per-flow bases is the wrong thing to do. What I mean is you can ask a > router about the average loss rate that it observes and that might > give you some valuable, however, if you ask a TCP flow about the > average loss rate the answer will mainly depend on the congestion > controller used and the currently available bandwidth, which is a very > dynamic property and not a link characteristic. So this information is > not usable for performance aware routing. A flow could give you > information about the observed RTT (min/max) on a certain path, or the > maximum available bandwidth on a path, but as I said, given you are in > a data center environment these are information that the controller > already should have anyway. > > _[Gaurav] They are two separate mechanisms. _Most DCs have some sort > of data-plane/ECMP aware tracing mechanism to detect the loss/delays > and can be combined with Application back-off to detect issue. All > this section is suggesting is that SR can be used to pin the path to > particular set of ECMP paths instead of relying on ECMP hashing. > _This is not quite what the text says. If that is the statement you want to make, that is fine but then you don't need to talk about performance aware routing at all. > > _ > Your example with detecting a faulty path due to losses does not work > with TCP as you never know if these loses are due to a problem on the > path, self-induced or by a competing flow. And even if you don't use > TCP and e.g. send constant bit rate traffic, there may be a large > number of competing TCP flows that can induce the loses. Try to steer > traffic "away" on a time-scale that is slower than TCP dynamics or > even your flow dynamic (when flows start or end) in case you have a > lot of very short flow, in the best case doesn't work and in the worst > case leads to oscillation. > > _[Gaurav] As _I said above, there are other mechanisms to detect loss > and trace the path on which loss is seen. This is a common mechanism > used in MSDCs. > _I think this is beyond the scope of the document. > > _ > > _ > > _I am happy to discuss further over the phone to try to explain the > thought process. I will also do check again with Authors to update the > text or something else based on our conversation. > Maybe see if some update can be made to the text first and then we can have another discussion if needed. > _ > > _ > > _Cheers, > > _ > > _Gaurav > > If you want to make TCP use for handover situation where one path > might go away or become unusable, it's best to use Multipath TCP (with > coupled congestion control) instead because that works on the right > time scale. Again, I don't think this is a use case for SR and I would > recommend to remove the section entirely. > > Mirja _ > > _ > > > > On Mon, Jul 16, 2018 at 11:08 PM, Gaurav Dawra > wrote: > > Hi Mirja, > > Ack. Let me work with authors to close ASAP. > > Cheers, > > Gaurav > > Sent from my iPhone > > On Jul 5, 2018, at 10:06 AM, Mirja Kühlewind > wrote: > >> Hi Gaurav, >> >> sorry for my very long delay but this got somehow a bit lost in >> my mailbox. >> >> I think with your changes you addressed explicit problems Martin >> called out, however, I still have high level concerns about these >> sections as they are mostly giving speculative recommendation >> which are not clear to me to work in practice. >> >> Regarding section 7.1, you say >> "A flowlet is defined as a burst of packets from the same flow >> followed by an idle interval." >> but then you say >> "...then the application can break the elephant flow F into >> flowlets F1, F2, F3, F4..." >> >> This sounds like you would just divide an elephant flow mostly >> randomly into flowlets which can interact badly with the >> congestion control. If you actually have chunks of data that are >> transmitted with large enough idle interval in between (as you >> define flowlets in the first sentence), that is not an elephant >> flow anymore and it will not help you to "spread the load of the >> elephant flow through all the ECMP paths". In summary I actually >> don't see how the concept of flowlets can be helpful to address >> the problem you have at all, and I still advise you to remove >> section 7.1 entirely. >> >> Regarding section 7.2, I also still skeptical about any benefits >> that can be achieved. Given you are in a data center, the >> controller should already know about static parameters such as >> the maximum bandwidth per link. For dynamic parameters, e.g. like >> loss rate, measuring them on a per-flow bases is the wrong thing >> to do. What I mean is you can ask a router about the average loss >> rate that it observes and that might give you some valuable, >> however, if you ask a TCP flow about the average loss rate the >> answer will mainly depend on the congestion controller used and >> the currently available bandwidth, which is a very dynamic >> property and not a link characteristic. So this information is >> not usable for performance aware routing. A flow could give you >> information about the observed RTT (min/max) on a certain path, >> or the maximum available bandwidth on a path, but as I said, >> given you are in a data center environment these are information >> that the controller already should have anyway. >> >> Your example with detecting a faulty path due to losses does not >> work with TCP as you never know if these loses are due to a >> problem on the path, self-induced or by a competing flow. And >> even if you don't use TCP and e.g. send constant bit rate >> traffic, there may be a large number of competing TCP flows that >> can induce the loses. Try to steer traffic "away" on a time-scale >> that is slower than TCP dynamics or even your flow dynamic (when >> flows start or end) in case you have a lot of very short flow, in >> the best case doesn't work and in the worst case leads to >> oscillation. >> >> If you want to make TCP use for handover situation where one path >> might go away or become unusable, it's best to use Multipath TCP >> (with coupled congestion control) instead because that works on >> the right time scale. Again, I don't think this is a use case for >> SR and I would recommend to remove the section entirely. >> >> Mirja >> >> >> On 05.07.2018 04:08, Gaurav Dawra wrote: >>> Hey Alvaro, Mirja, >>> >>> Friendly reminder to further progress this document. >>> >>> Cheers, >>> >>> Gaurav >>> >>> On Mon, Jun 18, 2018 at 5:13 PM, Gaurav Dawra >>> > wrote: >>> >>> Hi Alvaro, Mirja >>> >>> Any feedback or next steps to close this? >>> >>> Cheers, >>> >>> Gaurav >>> >>> Sent from my iPhone >>> >>> On Jun 12, 2018, at 7:06 AM, Gaurav Dawra >>> > wrote: >>> >>>> Hi Mirja, >>>> >>>> Friendly Reminder...Could you please also advice if there >>>> is anything further to DISCUSS on this document which was >>>> also related to TCP updates below? >>>> >>>> Cheers, >>>> >>>> Gaurav >>>> >>>> On Thu, Jun 7, 2018 at 9:02 AM, Alvaro Retana >>>> > wrote: >>>> >>>> Thanks Martin! >>>> >>>> >>>> On June 6, 2018 at 3:14:45 PM, Martin Stiemerling >>>> (mls.ietf@gmail.com ) wrote: >>>> >>>>> Hi Alvaro, all, >>>>> >>>>> Thanks for addressing my concerns. >>>>> >>>>> This version is good to go from my side. >>>>> >>>>> Kind regards, >>>>> >>>>> ;Martin >>>>> >>>>> Am 30.05.18 um 21:55 schrieb Alvaro Retana: >>>>> > Martin: >>>>> > br/>> Hi!!  How are you? >>>>> > br/>> Gaurav just posted a revision. Please takke a >>>>> look and let us know if br/>> the changes address your >>>>> concerrns or not. >>>>> > br/>> >>>>> https://www.ietf.org/rfcdiff??url2=draft-ietf-spring-segment-routing-msdc-09 >>>>> >>>>> >>>>> > br/>> Thanks!!! >>>>> > br/>> Alvaro. < >>>>> > br/>> On May 25, 2018 at 12:08:46 PM, Gaurav Dawra >>>>> ((gdawra.ietf@gmail.com >>>>> br/>> >>>> @gmail.com >) >>>>> wrote: >>>>> > br/>>> Hi Martin, < >>>>> >> >>>>> >> Thanks for review. I will post the new version. >>>>> Hopefully, it will br/>>> address all your comments >>>>> and we can close thhis review. >>>>> >> >>>>> >> Any updates on below response? >>>>> >> >>>>> >> Cheers, >>>>> >> >>>>> >> Gaurav >>>>> >> >>>>> >> Sent from my iPhone >>>>> >> >>>>> >> On May 23, 2018, at 4:17 AM, Gaurav Dawra >>>>> >>>>> br/>>> >>>> @gmail.com >> >>>>> wrote: >>>>> >> >>>>> >>> Hi Martin, >>>>> >>> >>>>> >>> Thanks for the review. Any further comments here ? I >>>>> will post the br/>>>> new version soon. < >>>>> >>> >>>>> >>> Cheers, >>>>> >>> >>>>> >>> Gaurav >>>>> >>> >>>>> >>> Sent from my iPhone >>>>> >>> >>>>> >>> On May 16, 2018, at 7:44 PM, Gaurav Dawra >>>>> >>>>> br/>>>> >>>> @gmail..com >> >>>>> wrote: >>>>> >>> >>>>> >>>> Hi Martin, >>>>> >>>> >>>>> >>>> Apologies from my end we had few internal authors >>>>> conversations on br/>>>>> the points you have raised. < >>>>> >>>> >>>>> >>>> Please find below my response. I will be happy to discuss further, br/>>>>> if needed. < >>>>> >>>> >>>>> >>>> inline... >>>>> >>>> >>>>> >>>>> On Apr 9, 2018, at 7:58 AM, Martin Stiemerling >>>>> br/>>>>>> >>>> >> wrote: >>>>> >>>>> >>>>> >>>>> Hi Gaurav, >>>>> >>>>> >>>>> >>>>> This got lost on my end, sorry for this. The filter >>>>> just moved br/>>>>>> these messages out of my sight... >>>>> :-/ >>>>> >>>>> >>>>> >>>>> Am 15.02.18 um 05:47 schrieb Gaurav Dawra: >>>>> >>>>>> Hey Martin, >>>>> >>>>>> Sorry for late reply. Please see some comments inline[Gaurav] >>>>> >>>>>>> On Jan 9, 2018, at 2:25 PM, Martin Stiemerling >>>>> br/>>>>>>>> >>>>> >>>> > br/>>>>>>>>; >>>>> >>>> >> wrote: >>>>> >>>>>>> >>>>> >>>>>>> Hi all, >>>>> >>>>>>> >>>>> >>>>>>> I've reviewed this document as part of the transport >>>>> area review br/>>>>>>>> team's ongoing effort to >>>>> review key IETF documents. These br/>>>>t;>>>> >>>>> comments were written primarily for the transport area >>>>> directors, br/>>>>>>>> but are copied to the >>>>> doocument's authors for their information br/>>>>>>>&> >>>>> and to allow them to address any issues raised. When >>>>> done at the >>>>> >>>>>>> time of IETF Last Call, the authors should consider this review br/>>>>>>>> together with any >>>>> other last-call comments they receive. Please >>>>> br/>>>&>>>>> always CC tsv-art@… if you reply to or >>>>> forward this review. >>>>> >>>>>>> >>>>> >>>>>>> Summary: >>>>> >>>>>>> This draft has serious issues in Section 7..1, 7.2 and in one part br/>>>>>>>> of Secction3, >>>>> described in the review, and needs to be rethought. >>>>> br/>>&>>>>>> The other sections are good AFAIK. >>>>> >>>>>>> >>>>> >>>>>>> >>>>> >>>>>>> Technicals: >>>>> >>>>>>> The overall draft looks ok, but the three points below look br/>>>>>>>> strange and need a fix >>>>> before publication IMHO: >>>>> >>>>>>> >>>>> >>>>>>> Both Sections, 7.1. and 7.2., are describing ideas, but not well br/>>>>>>>> proven >>>>> funcationality and not even safe to use functionality. >>>>> br/>>>&>>>>> Both are some sort discussing that >>>>> different paths in the network br/>>>>>>>> could be >>>>> used by the eend host traffic. This sounds pretty much >>>>> br/>>>>>>>t;> like the Path Aware Networking >>>>> Proposed Research Group br/>>t;>>>>>> >>>>> (https://irtf.org/panrg) and hints to the fact that >>>>> there is no br/>>>>>>>> commonly understannd and >>>>> accepted engineering solution in this space. >>>>> >>>>>>> >>>>> >>>>>>> Section 7.1: >>>>> >>>>>>> [KANDULA04] is a really old reference that hasn't been followed br/>>>>>>>> up iin recent times >>>>> and even worse there is no evidence that this >>>>> br/>>t;>>>>>> is going to work good enough or stable >>>>> enough under real Internet br/>>>>>>>> traffic. >>>>> Additioonally, it is more than unclear how any modern >>>>> TCP br/>>>>&ggt;>>> implementation will react to this >>>>> >>>>>> [Gaurav] Will get back on this. >>>>> >>>>> >>>>> >>>>> I will reply to the other email dicussing this. >>>>> >>>> I have replied to other thread. >>>>> >>>>> >>>>> >>>>>>> >>>>> >>>>>>> Section 7.2: >>>>> >>>>>>> This section describes an idea without detailing too >>>>> much about br/>>>>>>>> any furtther aspects. Further >>>>> it changes the commonly accepted br/>>>;>>>>> notion >>>>> of what an end host can do with the network. At best >>>>> this br/>>>>>>>> would require a good ddefinition of >>>>> what an end host in your br/>>>>>>>&ggt; setting is, >>>>> e.g., a highly modified piece of (at least) software >>>>> >>>>>>> that usually not found in OS availble on the market >>>>> (yet?) >>>>> >>>>>>> Further communicating instantaneous path >>>>> characteristics to a br/>>>>>>>> central point is >>>>> potentially a bad idea, as the data is already >>>>> br/>>>;>>>>> outdated when reported by any node. >>>>> >>>>>> [Gaurav] I believe Authors are trying to highlight that Host which br/>>>>>>> is defineed in >>>>> br/>>>>>>> >>>>> (https://tools.ietf.org/html/draftt-ietf-spring-segment-routing-15 >>>>> ) >>>>> br/>>>>>>> can innfluence the traffic based on the >>>>> Calculations locally or br/>>>t;>>>> jointly with >>>>> the controller. Implementations can decide how much >>>>> br/>>>>>>> Centralized -vs- localized coontrol is >>>>> allowed at Host based on br/>>>>>>> perfoormance data >>>>> collection. >>>>> >>>>> >>>>> >>>>> Performance data collection (monitoring?) isn't crucial when it br/>>>>>> comes to timely (actuaally >>>>> real-time) reaction. However, this br/>>>>>> secttion >>>>> isn't just about performance data collection as it is >>>>> about br/>>>>>>> "Performance-aware routing" this >>>>> seems to try to interact in br/>>>>>> real-time with >>>>> the network behhavior of TCP. This isn't even close >>>>> br/>>>>>> to acceeptable. >>>>> >>>>> >>>>> >>>>> I would be ok to say that it is useful to collect performance data br/>>>>>> for offline analysis and >>>>> improvement of the data network. However, >>>>> br/>>>>>&ggt; this is at completely different >>>>> magnitues of time scales. >>>>> >>>>> >>>>> >>>>> I would recommend to remove the TCP part from this section entirely. >>>>> >>>> Ack, will update in next rev: >>>>> >>>> >>>>> >>>> Section will read like this: >>>>> >>>> >>>>> >>>> ; >>>>> >>>> /Knowing the path associated with flows/packets, the end host may/ >>>>> >>>> /deduce certain characteristics of the path on its own, and/ >>>>> >>>> /additionally use the information supplied with path information/ >>>>> >>>> /pushed from the controller or received via pull request. The host/ >>>>> >>>> /may further share its path observations with the centralized agent,/ >>>>> >>>> /so that the latter may keep up-to-date network health map to assist/ >>>>> >>>> /other hosts with this information./ >>>>> >>>> // >>>>> >>>> /For example, an application A.1 at HostA may pin a flow destined/ >>>>> >>>> /to HostZ via Spine node Node5 using label stack {16005, 16011}. The/ >>>>> >>>> /application A.1 may collect information on packet loss, deduced from/ >>>>> >>>> /Other offline mechanisms. [There are some pingMesh mechanisms which / >>>>> >>>> /Can be used here]/ >>>>> >>>> /Through these mechanisms information to a centralized agent, e.g./ >>>>> >>>> /after a flow completes, or periodically for longer lived flows./ >>>>> >>>> /Next, using both local and/or global performance data, application/ >>>>> >>>> /A.1 as well as other applications sharing the same resources in the/ >>>>> >>>> /DC fabric may pick up the best path for the new flow, or update an/ >>>>> >>>> /existing path (e.g.: when informed of congestion on an existing/ >>>>> >>>> /path)./ >>>>> >>>> ; >>>>> >>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>>>> >>>>> >>>>>>> Section 3, 3rd bullet point: >>>>> >>>>>>> It is the foundation of TCP that the network is >>>>> regarded as a br/>>>>>>>> black box and that you infer >>>>> from the transmission of packets br/>>>>;>>>> what the >>>>> current state of the network path is. Inferring >>>>> network br/>>>>>>>> path metrics (you mention SRTT, >>>>> MSS, CWND ) is a bad idea, as br/>>>>>>>>; this would >>>>> required that all paths exhibit this and if not what >>>>> br//>>>>>>>> is going to happen? >>>>> >>>>>>> It could be an interesting research field to change many points br/>>>>>>>> in TCP'ss behavior, >>>>> but this once again points to the fact that >>>>> br/>>>&>>>>> this not the IETF works but IRTF or >>>>> elsewhere. >>>>> >>>>>> [Gaurav] Martin, Authors are trying to suggest that TCP is rightly br/>>>>>>> treating Network as >>>>> Black Box. Authors are implying per path br/>>>>;>>> >>>>> performance metrics as not cached. Is there some >>>>> change in text br/>>>>>>> you are suggesting?? >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> I would recommend to remove the 3rd bullet point completey. TCP br/>>>>>> isn't the place to rememmber >>>>> "good" or "bad" paths. This is br/>>>>>> something the >>>>> network could decide, e.g., rerouting TCP flows >>>>> br/>&ggt;>>>> within the network or changing the >>>>> forwarding path in the network br/>>>>>> for >>>>> particular flows (if it is not routed). >>>>> >>>> >>>>> >>>> Ack, after discussion, we will remove the Section 3 - 3rd br/>>>>> bullet point. Willl >>>>> update in next rev - coming shortly. >>>>> >>>> >>>>> >>>>> >>>>> >>>>> Kind regards, >>>>> >>>>> >>>>> >>>>>  Martin >>>>> >>>>> >>>>> >>>> >>>> >>>> >>> >>> >>> >>> _______________________________________________ >>> Tsv-art mailing list >>> Tsv-art@ietf.org >>> https://www.ietf.org/mailman/listinfo/tsv-art >>> >> > --------------162CB3186DFFD3FBEADF9B24 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit Hi Gaurav,

please see inline.

On 03.08.2018 07:20, Gaurav Dawra wrote:
Hey Mirja,

Sorry for the long delay. I was traveling constantly since IETF and bit lost in my mailbox and discussion with Authors. Please see my response inline[Gaurav]


I think with your changes you addressed explicit problems Martin called out, however, I still have high level concerns about these sections as they are mostly giving speculative recommendation which are not clear to me to work in practice.

Regarding section 7.1, you say
"A flowlet is defined as a burst of packets from the same flow followed by an idle interval."
but then you say
"...then the application can break the elephant flow F into flowlets F1, F2, F3, F4..."

This sounds like you would just divide an elephant flow mostly randomly into flowlets which can interact badly with the congestion control. If you actually have chunks of data that are transmitted with large enough idle interval in between (as you define flowlets in the first sentence), that is not an elephant flow anymore and it will not help you to "spread the load of the elephant flow through all the ECMP paths". In summary I actually don't see how the concept of flowlets can be helpful to address the problem you have at all, and I still advise you to remove section 7.1 entirely.

[Gaurav] Hi Mirja, Thanks for the review. The proposal here is no different that current ECMP hashing at flowlet level. The only difference which is being pointed out here is that if we use SR, we could leverage on the ability of be aware of multiple disjoint paths rather than the hashing. It’s pins the flowlets to particular paths which is basic SR operations.


Yes the problem is that we usually don't recommend ECMP hashing on flowlet level because it can interact badly with the end-end mechanisms of that flow. As I said, I don't see how the notion of flowlets help you problem and therefore I still recommend to remove that paragraph.


Regarding section 7.2, I also still skeptical about any benefits that can be achieved. Given you are in a data center, the controller should already know about static parameters such as the maximum bandwidth per link.

For dynamic parameters, e.g. like loss rate, measuring them on a per-flow bases is the wrong thing to do. What I mean is you can ask a router about the average loss rate that it observes and that might give you some valuable, however, if you ask a TCP flow about the average loss rate the answer will mainly depend on the congestion controller used and the currently available bandwidth, which is a very dynamic property and not a link characteristic. So this information is not usable for performance aware routing. A flow could give you information about the observed RTT (min/max) on a certain path, or the maximum available bandwidth on a path, but as I said, given you are in a data center environment these are information that the controller already should have anyway.

[Gaurav] They are two separate mechanisms. Most DCs have some sort of data-plane/ECMP aware tracing mechanism to detect the loss/delays and can be combined with Application back-off to detect issue. All this section is suggesting is that SR can be used to pin the path to particular set of ECMP paths instead of relying on ECMP hashing.


This is not quite what the text says. If that is the statement you want to make, that is fine but then you don't need to talk about performance aware routing at all.


Your example with detecting a faulty path due to losses does not work with TCP as you never know if these loses are due to a problem on the path, self-induced or by a competing flow. And even if you don't use TCP and e.g. send constant bit rate traffic, there may be a large number of competing TCP flows that can induce the loses. Try to steer traffic "away" on a time-scale that is slower than TCP dynamics or even your flow dynamic (when flows start or end) in case you have a lot of very short flow, in the best case doesn't work and in the worst case leads to oscillation.

[Gaurav] As I said above, there are other mechanisms to detect loss and trace the path on which loss is seen. This is a common mechanism used in MSDCs.

I think this is beyond the scope of the document. 

 

I am happy to discuss further over the phone to try to explain the thought process. I will also do check again with Authors to update the text or something else based on our conversation.


Maybe see if some update can be made to the text first and then we can have another discussion if needed.

 

Cheers,

 

Gaurav

If you want to make TCP use for handover situation where one path might go away or become unusable, it's best to use Multipath TCP (with coupled congestion control) instead because that works on the right time scale. Again, I don't think this is a use case for SR and I would recommend to remove the section entirely.

Mirja

 



On Mon, Jul 16, 2018 at 11:08 PM, Gaurav Dawra <gdawra.ietf@gmail.com> wrote:
Hi Mirja,

Ack. Let me work with authors to close ASAP.

Cheers,

Gaurav

Sent from my iPhone

On Jul 5, 2018, at 10:06 AM, Mirja Kühlewind <ietf@kuehlewind.net> wrote:

Hi Gaurav,

sorry for my very long delay but this got somehow a bit lost in my mailbox.

I think with your changes you addressed explicit problems Martin called out, however, I still have high level concerns about these sections as they are mostly giving speculative recommendation which are not clear to me to work in practice.

Regarding section 7.1, you say
"A flowlet is defined as a burst of packets from the same flow followed by an idle interval."
but then you say
"...then the application can break the elephant flow F into flowlets F1, F2, F3, F4..."

This sounds like you would just divide an elephant flow mostly randomly into flowlets which can interact badly with the congestion control. If you actually have chunks of data that are transmitted with large enough idle interval in between (as you define flowlets in the first sentence), that is not an elephant flow anymore and it will not help you to "spread the load of the elephant flow through all the ECMP paths". In summary I actually don't see how the concept of flowlets can be helpful to address the problem you have at all, and I still advise you to remove section 7.1 entirely.

Regarding section 7.2, I also still skeptical about any benefits that can be achieved. Given you are in a data center, the controller should already know about static parameters such as the maximum bandwidth per link. For dynamic parameters, e.g. like loss rate, measuring them on a per-flow bases is the wrong thing to do. What I mean is you can ask a router about the average loss rate that it observes and that might give you some valuable, however, if you ask a TCP flow about the average loss rate the answer will mainly depend on the congestion controller used and the currently available bandwidth, which is a very dynamic property and not a link characteristic. So this information is not usable for performance aware routing. A flow could give you information about the observed RTT (min/max) on a certain path, or the maximum available bandwidth on a path, but as I said, given you are in a data center environment these are information that the controller already should have anyway.

Your example with detecting a faulty path due to losses does not work with TCP as you never know if these loses are due to a problem on the path, self-induced or by a competing flow. And even if you don't use TCP and e.g. send constant bit rate traffic, there may be a large number of competing TCP flows that can induce the loses. Try to steer traffic "away" on a time-scale that is slower than TCP dynamics or even your flow dynamic (when flows start or end) in case you have a lot of very short flow, in the best case doesn't work and in the worst case leads to oscillation.

If you want to make TCP use for handover situation where one path might go away or become unusable, it's best to use Multipath TCP (with coupled congestion control) instead because that works on the right time scale. Again, I don't think this is a use case for SR and I would recommend to remove the section entirely.

Mirja


On 05.07.2018 04:08, Gaurav Dawra wrote:
Hey Alvaro, Mirja, 

Friendly reminder to further progress this document.

Cheers,

Gaurav

On Mon, Jun 18, 2018 at 5:13 PM, Gaurav Dawra <gdawra.ietf@gmail.com> wrote:
Hi Alvaro, Mirja 

Any feedback or next steps to close this?

Cheers,

Gaurav

Sent from my iPhone

On Jun 12, 2018, at 7:06 AM, Gaurav Dawra <gdawra.ietf@gmail.com> wrote:

Hi Mirja,

Friendly Reminder...Could you please also advice if there is anything further to DISCUSS on this document which was also related to TCP updates below?

Cheers,

Gaurav

On Thu, Jun 7, 2018 at 9:02 AM, Alvaro Retana <aretana.ietf@gmail.com> wrote:

Thanks Martin!


On June 6, 2018 at 3:14:45 PM, Martin Stiemerling (mls.ietf@gmail.com) wrote:
Hi Alvaro, all,

Thanks for addressing my concerns.

This version is good to go from my side.

Kind regards,

;Martin

Am 30.05.18 um 21:55 schrieb Alvaro Retana:
> Martin:
> br/>> Hi!!  How are you?
> br/>> Gaurav just posted a revision.  Please takke a look and let us know if br/>> the changes address your concerrns or not.
> br/>> https://www.ietf.org/rfcdiff??url2=draft-ietf-spring-segment-routing-msdc-09
> br/>> Thanks!!!
> br/>> Alvaro. <
> br/>> On May 25, 2018 at 12:08:46 PM, Gaurav Dawra ((gdawra.ietf@gmail.com br/>> <mailto:gdawra.ietf@@gmail.com>) wrote:
> br/>>> Hi Martin, <
>>
>> Thanks for review. I will post the new version. Hopefully, it will br/>>> address all your comments and we can close thhis review.
>>
>> Any updates on below response?
>>
>> Cheers,
>>
>> Gaurav
>>
>> Sent from my iPhone
>>
>> On May 23, 2018, at 4:17 AM, Gaurav Dawra <gdawra.ietf@gmail.com br/>>> <mailto:gdawra.ietf@@gmail.com>> wrote:
>>
>>> Hi Martin,
>>>
>>> Thanks for the review. Any further comments here ? I will post the br/>>>> new version soon. <
>>>
>>> Cheers,
>>>
>>> Gaurav
>>>
>>> Sent from my iPhone
>>>
>>> On May 16, 2018, at 7:44 PM, Gaurav Dawra <gdawra.ietf@gmail.com br/>>>> <mailto:gdawra.ietf@@gmail..com>> wrote:
>>>
>>>> Hi Martin,
>>>>
>>>> Apologies from my end we had few internal authors conversations on br/>>>>> the points you have raised. <
>>>>
>>>> Please find below my response. I will be happy to discuss further, br/>>>>> if needed. <
>>>>
>>>> <Gaurav> inline...
>>>>
>>>>> On Apr 9, 2018, at 7:58 AM, Martin Stiemerling <mls.ietf@gmail.com br/>>>>>> <mailto:mls.iietf@gmail.com>> wrote:
>>>>>
>>>>> Hi Gaurav,
>>>>>
>>>>> This got lost on my end, sorry for this. The filter just moved br/>>>>>> these messages out of my sight... :-/
>>>>>
>>>>> Am 15.02.18 um 05:47 schrieb Gaurav Dawra:
>>>>>> Hey Martin,
>>>>>> Sorry for late reply. Please see some comments inline[Gaurav]
>>>>>>> On Jan 9, 2018, at 2:25 PM, Martin Stiemerling br/>>>>>>>> <mls.ietf@@gmail.com <mailto:mls.ietf@gmail.com> br/>>>>>>>>; <mailto:mls.ietf@gmail.com>> wrote:
>>>>>>>
>>>>>>> Hi all,
>>>>>>>
>>>>>>> I've reviewed this document as part of the transport area review br/>>>>>>>> team's ongoing effort to review key IETF documents. These br/>>>&gtt;>>>> comments were written primarily for the transport area directors, br/>>>>>>>> but are copied to the doocument's authors for their information br/>>>>>>>&> and to allow them to address any issues raised. When done at the
>>>>>>> time of IETF Last Call, the authors should consider this review br/>>>>>>>> together with any other last-call comments they receive. Please br/>>>&>>>>> always CC tsv-art@… if you reply to or forward this review.
>>>>>>>
>>>>>>> Summary:
>>>>>>> This draft has serious issues in Section 7..1, 7.2 and in one part br/>>>>>>>> of Secction3, described in the review, and needs to be rethought. br/>>&>>>>>> The other sections are good AFAIK.
>>>>>>>
>>>>>>>
>>>>>>> Technicals:
>>>>>>> The overall draft looks ok, but the three points below look br/>>>>>>>> strange and need a fix before publication IMHO:
>>>>>>>
>>>>>>> Both Sections, 7.1. and 7.2., are describing ideas, but not well br/>>>>>>>> proven funcationality and not even safe to use functionality. br/>>>&>>>>> Both are some sort discussing that different paths in the network br/>>>>>>>> could be used by the eend host traffic. This sounds pretty much br/>>>>>>&gtt;> like the Path Aware Networking Proposed Research Group br/>&gtt;>>>>>> (https://irtf.org/panrg) and hints to the fact that there is no br/>>>>>>>> commonly understannd and accepted engineering solution in this space.
>>>>>>>
>>>>>>> Section 7.1:
>>>>>>> [KANDULA04] is a really old reference that hasn't been followed br/>>>>>>>> up iin recent times and even worse there is no evidence that this br/>&gtt;>>>>>> is going to work good enough or stable enough under real Internet br/>>>>>>>> traffic. Additioonally, it is more than unclear how any modern TCP br/>>>>&ggt;>>> implementation will react to this
>>>>>> [Gaurav] Will get back on this.
>>>>>
>>>>> I will reply to the other email dicussing this.
>>>> <Gaurav> I have replied to other thread.
>>>>>
>>>>>>>
>>>>>>> Section 7.2:
>>>>>>> This section describes an idea without detailing too much about br/>>>>>>>> any furtther aspects. Further it changes the commonly accepted br/>>>;>>>>> notion of what an end host can do with the network. At best this br/>>>>>>>> would require a good ddefinition of what an end host in your br/>>>>>>>&ggt; setting is, e.g., a highly modified piece of (at least) software
>>>>>>> that usually not found in OS availble on the market (yet?)
>>>>>>> Further communicating instantaneous path characteristics to a br/>>>>>>>> central point is potentially a bad idea, as the data is already br/>>>;>>>>> outdated when reported by any node.
>>>>>> [Gaurav] I believe Authors are trying to highlight that Host which br/>>>>>>> is defineed in br/>>>>>>> (https://tools.ietf.org/html/draftt-ietf-spring-segment-routing-15) br/>>>>>>> can innfluence the traffic based on the Calculations locally or br/>>&gtt;>>>> jointly with the controller. Implementations can decide how much br/>>>>>>> Centralized -vs- localized coontrol is allowed at Host based on br/>>>>>>> perfoormance data collection.
>>>>>
>>>>> Performance data collection (monitoring?) isn't crucial when it br/>>>>>> comes to timely (actuaally real-time) reaction. However, this br/>>>>>> secttion isn't just about performance data collection as it is about br/>>>>>>> "Performance-aware routing" this seems to try to interact in br/>>>>>> real-time with the network behhavior of TCP. This isn't even close br/>>>>>> to acceeptable.
>>>>>
>>>>> I would be ok to say that it is useful to collect performance data br/>>>>>> for offline analysis and improvement of the data network. However, br/>>>>>&ggt; this is at completely different magnitues of time scales.
>>>>>
>>>>> I would recommend to remove the TCP part from this section entirely.
>>>> <Gaurav>Ack, will update in next rev:
>>>>
>>>> Section will read like this:
>>>>
>>>> ;
>>>> /Knowing the path associated with flows/packets, the end host may/
>>>> /deduce certain characteristics of the path on its own, and/
>>>> /additionally use the information supplied with path information/
>>>> /pushed from the controller or received via pull request. The host/
>>>> /may further share its path observations with the centralized agent,/
>>>> /so that the latter may keep up-to-date network health map to assist/
>>>> /other hosts with this information./
>>>> //
>>>> /For example, an application A.1 at HostA may pin a flow destined/
>>>> /to HostZ via Spine node Node5 using label stack {16005, 16011}. The/
>>>> /application A.1 may collect information on packet loss, deduced from/
>>>> /Other offline mechanisms. [There are some pingMesh mechanisms which /
>>>> /Can be used here]/
>>>> /Through these mechanisms information to a centralized agent, e.g./
>>>> /after a flow completes, or periodically for longer lived flows./
>>>> /Next, using both local and/or global performance data, application/
>>>> /A.1 as well as other applications sharing the same resources in the/
>>>> /DC fabric may pick up the best path for the new flow, or update an/
>>>> /existing path (e.g.: when informed of congestion on an existing/
>>>> /path)./
>>>> ;
>>>>
>>>>>
>>>>>
>>>>>>>
>>>>>>> Section 3, 3rd bullet point:
>>>>>>> It is the foundation of TCP that the network is regarded as a br/>>>>>>>> black box and that you infer from the transmission of packets br/>>>>;>>>> what the current state of the network path is. Inferring network br/>>>>>>>> path metrics (you mention SRTT, MSS, CWND ) is a bad idea, as br/>>>>>>>>; this would required that all paths exhibit this and if not what br//>>>>>>>> is going to happen?
>>>>>>> It could be an interesting research field to change many points br/>>>>>>>> in TCP'ss behavior, but this once again points to the fact that br/>>>&>>>>> this not the IETF works but IRTF or elsewhere.
>>>>>> [Gaurav] Martin, Authors are trying to suggest that TCP is rightly br/>>>>>>> treating Network as Black Box. Authors are implying per path br/>>>>;>>> performance metrics as not cached. Is there some change in text br/>>>>>>> you are suggesting??
>>>>>
>>>>>
>>>>> I would recommend to remove the 3rd bullet point completey. TCP br/>>>>>> isn't the place to rememmber "good" or "bad" paths. This is br/>>>>>> something the network could decide, e.g., rerouting TCP flows br/>&ggt;>>>> within the network or changing the forwarding path in the network br/>>>>>> for particular flows (if it is not routed).
>>>>
>>>> <Gaurav> Ack, after discussion, we will remove the Section 3 - 3rd br/>>>>> bullet point. Willl update in next rev - coming shortly.
>>>>
>>>>>
>>>>> Kind regards,
>>>>>
>>>>>  Martin
>>>>>
>>>> 




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--------------162CB3186DFFD3FBEADF9B24-- From nobody Fri Aug 10 09:07:55 2018 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E8701130E34 for ; Fri, 10 Aug 2018 09:07:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tBDHmgrS6EPY for ; Fri, 10 Aug 2018 09:07:52 -0700 (PDT) Received: from orange.com (mta135.mail.business.static.orange.com [80.12.70.35]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 25B48130E26 for ; Fri, 10 Aug 2018 09:07:52 -0700 (PDT) Received: from opfednr05.francetelecom.fr (unknown [xx.xx.xx.69]) by opfednr25.francetelecom.fr (ESMTP service) with ESMTP id 41n9522cxtzCrWg for ; Fri, 10 Aug 2018 18:07:50 +0200 (CEST) Received: from Exchangemail-eme2.itn.ftgroup (unknown [xx.xx.31.72]) by opfednr05.francetelecom.fr (ESMTP service) with ESMTP id 41n9521mhMzyPk for ; Fri, 10 Aug 2018 18:07:50 +0200 (CEST) Received: from OPEXCLILM21.corporate.adroot.infra.ftgroup ([fe80::e92a:c932:907e:8f06]) by OPEXCLILMA3.corporate.adroot.infra.ftgroup ([fe80::60a9:abc3:86e6:2541%19]) with mapi id 14.03.0408.000; Fri, 10 Aug 2018 18:07:50 +0200 From: To: "spring@ietf.org" Thread-Topic: IETF 102 minutes Thread-Index: AdQwxAo51k9KmzoiSIicr5zeeLvKeg== Date: Fri, 10 Aug 2018 16:07:49 +0000 Message-ID: <18547_1533917270_5B6DB856_18547_47_1_53C29892C857584299CBF5D05346208A47B1DCEB@OPEXCLILM21.corporate.adroot.infra.ftgroup> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.4] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A47B1DCEBOPEXCLILM21corp_" MIME-Version: 1.0 Archived-At: Subject: [spring] IETF 102 minutes X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 10 Aug 2018 16:07:54 -0000 --_000_53C29892C857584299CBF5D05346208A47B1DCEBOPEXCLILM21corp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi all, SPRING minutes have been uploaded: https://datatracker.ietf.org/meeting/102= /materials/minutes-102-spring-00 For each agenda item, there is also an URL to the video. Please review and comment as needed. Thank you Linda for taking the minutes. Regards, --Bruno ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_53C29892C857584299CBF5D05346208A47B1DCEBOPEXCLILM21corp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi all,

 

SPRING minutes have been u= ploaded: https://datatracker.ietf.org/meeting/102/materials/minutes-102-spring-00

For each agenda item, ther= e is also an URL to the video.

 

Please review and comment = as needed.

 

Thank you Linda for taking= the minutes.

 

Regards,=

--Bruno<= /p> 

______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
--_000_53C29892C857584299CBF5D05346208A47B1DCEBOPEXCLILM21corp_-- From nobody Thu Aug 16 13:41:35 2018 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BD6B6130F26 for ; Thu, 16 Aug 2018 13:41:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JFPe4EaHiR99 for ; Thu, 16 Aug 2018 13:41:32 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 21FAF130E76 for ; Thu, 16 Aug 2018 13:41:32 -0700 (PDT) Received: from LHREML713-CAH.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id 65A9B3B06195F for ; Thu, 16 Aug 2018 21:41:28 +0100 (IST) Received: from LHREML523-MBX.china.huawei.com ([169.254.7.235]) by LHREML713-CAH.china.huawei.com ([10.201.108.36]) with mapi id 14.03.0399.000; Thu, 16 Aug 2018 21:41:28 +0100 From: "Yutianpeng (Tim)" To: "spring@ietf.org" Thread-Topic: Yang data model for SID forwarding counters Thread-Index: AdQ1oBekbdOca5QcT8GXwxPuJ9EXKQ== Date: Thu, 16 Aug 2018 20:41:27 +0000 Message-ID: <35FF0D51C8DAB54B95B0426331F984FF52024AB8@lhreml523-mbx.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.203.126.98] Content-Type: multipart/alternative; boundary="_000_35FF0D51C8DAB54B95B0426331F984FF52024AB8lhreml523mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [spring] Yang data model for SID forwarding counters X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 16 Aug 2018 20:41:34 -0000 --_000_35FF0D51C8DAB54B95B0426331F984FF52024AB8lhreml523mbxchi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, I am trying to find data model for SID forwarding counters, but I only find= SRV6 based counters in "draft-raza-spring-srv6-yang-00". I think it is quite important to have YANG data models for IGP based or BGP= EPE also. Can we put this inside "draft-ietf-spring-sr-yang"? It might be better to p= ut this inside a common data model instead of per protocol basis one. Thanks & Regards, Tim --_000_35FF0D51C8DAB54B95B0426331F984FF52024AB8lhreml523mbxchi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,

I am trying to find= data model for SID forwarding counters, but I only find SRV6 based counter= s in “draft-raza-spring-srv6-yang-00”.

I think it is quite= important to have YANG data models for IGP based or BGP EPE also.

Can we put this ins= ide “draft-ietf-spring-sr-yang”? It might be better to put this= inside a common data model instead of per protocol basis one.

 

Thanks & Regard= s,

Tim

--_000_35FF0D51C8DAB54B95B0426331F984FF52024AB8lhreml523mbxchi_-- From nobody Thu Aug 16 15:42:22 2018 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D55C9130F32; Thu, 16 Aug 2018 15:42:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WxeuA-ku4bZh; Thu, 16 Aug 2018 15:42:19 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 39FAB130F2C; Thu, 16 Aug 2018 15:42:19 -0700 (PDT) Received: from lhreml701-cah.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id 9AF46ADB713D5; Thu, 16 Aug 2018 23:42:15 +0100 (IST) Received: from SJCEML702-CHM.china.huawei.com (10.208.112.38) by lhreml701-cah.china.huawei.com (10.201.108.42) with Microsoft SMTP Server (TLS) id 14.3.399.0; Thu, 16 Aug 2018 23:42:16 +0100 Received: from SJCEML521-MBX.china.huawei.com ([169.254.1.107]) by SJCEML702-CHM.china.huawei.com ([169.254.4.45]) with mapi id 14.03.0399.000; Thu, 16 Aug 2018 15:42:11 -0700 From: Linda Dunbar To: "spring@ietf.org" , "draft-filsfils-spring-srv6-network-programming@ietf.org" , "Clarence Filsfils (cfilsfil)" Thread-Topic: some comments to draft-filsfils-spring-srv6-network-programming-05 Thread-Index: AdQ1r/DFdZasIR5lToe1OdWTBRgS1Q== Date: Thu, 16 Aug 2018 22:42:11 +0000 Message-ID: <4A95BA014132FF49AE685FAB4B9F17F66B0DC466@sjceml521-mbx.china.huawei.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.192.11.118] Content-Type: multipart/alternative; boundary="_000_4A95BA014132FF49AE685FAB4B9F17F66B0DC466sjceml521mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [spring] some comments to draft-filsfils-spring-srv6-network-programming-05 X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 16 Aug 2018 22:42:21 -0000 --_000_4A95BA014132FF49AE685FAB4B9F17F66B0DC466sjceml521mbxchi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Clarence, et al, Does your draft cover the scenario of a node "N" in Section 5 (Transit Beh= avior) belonging to a different administrative domain? Section 7 is on Intra Domain deployment Basic Security, will you consider "= Inter Domain" basic security? I assume that "SEC 1", "SEC 2" etc. are meant for Identifying "Basic Securi= ty". Can you use a "SEC-1", or "SEC-REQ-1", etc. to make it easier for cros= s reference from other documents? Thanks, Linda Dunbar --_000_4A95BA014132FF49AE685FAB4B9F17F66B0DC466sjceml521mbxchi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

Clarence, et al,

 

Does your draft cover the scenario of a node “= N”  in Section 5 (Transit Behavior) belonging to a different adm= inistrative domain?

 

Section 7 is on Intra Domain deployment Basic Securi= ty, will you consider “Inter Domain” basic security?

 

I assume that “SEC 1”, “SEC 2̶= 1; etc. are meant for Identifying “Basic Security”. Can you use= a “SEC-1”, or “SEC-REQ-1”, etc. to make it easier = for cross reference from other documents?

 

Thanks, Linda Dunbar

--_000_4A95BA014132FF49AE685FAB4B9F17F66B0DC466sjceml521mbxchi_-- From dominik.pataky@tu-dresden.de Thu Aug 16 07:36:53 2018 Return-Path: X-Original-To: spring@ietfa.amsl.com Delivered-To: spring@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 648A7130E78 for ; Thu, 16 Aug 2018 07:36:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.8 X-Spam-Level: X-Spam-Status: No, score=-2.8 tagged_above=-999 required=5 tests=[BAYES_05=-0.5, RCVD_IN_DNSWL_MED=-2.3] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 30RIBas6ZLVr for ; Thu, 16 Aug 2018 07:36:51 -0700 (PDT) Received: from mailout5.zih.tu-dresden.de (mailout5.zih.tu-dresden.de [141.30.67.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F2123130E80 for ; Thu, 16 Aug 2018 07:36:50 -0700 (PDT) Received: from mail.zih.tu-dresden.de ([141.76.14.4]) by mailout5.zih.tu-dresden.de with esmtps (TLSv1.2:DHE-RSA-AES256-GCM-SHA384:256) (Exim 4.84_2) (envelope-from ) id 1fqJOJ-000432-TQ for spring@ietf.org; Thu, 16 Aug 2018 16:36:48 +0200 Received: from [172.16.65.251] by server-40.mailclusterdns.zih.tu-dresden.de with esmtpsa (TLSv1.2:AES128-SHA:128) (envelope-from ) id 1fqJOJ-0008I4-NV for spring@ietf.org; Thu, 16 Aug 2018 16:36:47 +0200 From: Dominik Pataky To: spring@ietf.org Openpgp: preference=signencrypt Autocrypt: addr=dominik.pataky@tu-dresden.de; prefer-encrypt=mutual; keydata= xsFNBFpTJOABEADIrwaOTYCfEQMrTKhXA4VP+8Mo702gGulbk5ocA6XHUVHVtbeaGlqNyOny M22SETuNvkyitRhS2e89trPlV32PAh0UylVtJUz7VSRMdM44zw6WJeX8qxP5jMpUxJvUugTa QpJeBJFnaof21YC+LSJrJo6vIZ+Z3ng8fso7mc/rCvIwvUHtJGqcNiIC900gCFLnfBFTPgNy B/n9J1oIIBHMzHhW035emyYNhQpHdtAFYEiQaIhBmbObE9TV2LHDgnJMVQMPRSuiqAh84bZ1 HE7APxSuwN+zi7Mdoshg7AbzhPgF1ij6ILVexssw00IAF6rr0d8+EwOAOoo10PE2fMykxGKo 5RXMEBzTJAN3W3yT6HAnGaU9X1P0MbqR/CXxFSp0IWrfdweyb3DkFKSyR8rAkF1EPT/Z/eJr tNxRvtTI0E/Bhz6VdtwapafT8923JHpjg87LPgDa5Cfr1EkuzOgPD9FTnGcYDN2iqpKD/8S4 S9bR2AEIAaztsNWWltaD+6qSHpHzrrDOpVGJogJPvGjq/pv3YgjRwAXCuGs5MKhkMIqxXudk ssulJzTz/bif+UURKlergdYoO4tlGifLsXVanagaOsC8wVDsZgIvXLCyuN7xeV4XiH1xZ6A7 WWUMHki2OFHttoHY40I4On0VlwkJ8lpVl1z50/T88l2oH/R99wARAQABzSBEb21pbmlrIFBh dGFreSA8bWFpbEBkcGF0YWt5LmV1PsLBlwQTAQoAQQIbAwUJAdangAULCQgHAwUVCgkICwUW AgMBAAIeAQIXgBYhBNEPB+KU2qrg/5F2iLMn8Z/k+/mwBQJaUzUDAhkBAAoJELMn8Z/k+/mw bo0QAKL852H0LXsfOdrbAxdn/3zHqMFRzeo56+C3kPmGMphlIm+PlE7a0Errmkn5ogaCzhrT fzg7kdc/9q1oAVvX5XBAZ1QfhzRHxQ1h8/tPmzJvigxRriplpNRhNqA8OEWErKMVQipH8CEB L9K2OZB1we9f7n/NhlT45rCb1Ye9KiroGnT+Q4fM49lM/e7V7TrYLMJyTYULqGyMbrW+6r9n KW6cGa7BzRYZNSR02i970CsLaAZznbWWZeAXiZBA26EwYOch4ssX/8G/7nspK7UZjwoIddPH eUFZg0cOO91eUTtU07nnm1p3BvHOZeezgEIOlYzJ6Q62/tPQRSH/DSgzpzJZw60iL/pWlWk7 ujB28zNrdUHaPZ6lkZuqByMgGYNd05qx3Ojq3uDYdVmTooxi+35hfhy0yOJdbziPSA93feMB 9J7OfkidJY+XNC0tYjxrovN6kUt9rZJQHT2v3k0ovDe40hjckZZK9a5iyfJPcLSufhgvyRzH rW+nrssnOuHanThbqgBE3SQh8CRFrld4cRZPSqEjrmlu1kKSiut2sLkxCm+2PUEyHsnTy85A QfQYompjb+hq09oMG0Am6SwsdyTDMfGBmc65CtGHFGrWsZqezucB8z9QbECEjDE7NdMntW+R /ZmHNYkePkKaEO2oPJQ506j9i7y21J+o1QJZz1QHzsFNBFpTJOABEACu3xehKEodV3X7r8mT Dw63vXVHjEvn1DBURqOHhnaN8yqJMp9HruGxlI31TDBuFD4b7MVj0yjFEeQuJkpeOX+5nUtc SYKAKfNQZwGvAbvdMoFBGcyaNSEPqbP03GXjmrN0rELnqz7Kv0oxmiQQDI677FjNwBPC3QsF fKeNGr5KiVedGSydKYGbvs1rRvtB3RnwN5IUWAWPb7VgaOCmPzjqS+sC+VcdQ4ckDlAf6n6p 0Xl6VcoJGKaG/hS/jj2Nu0PjTsN8nu88Ua8pOrQ/bLDzmpyXTCpHaCutRSySu5R9T/QR/J19 MRgHC2bd5jFMr0mkxN+PfVsqBqIUXxSlotICNjuZadATpJCeGc7mxzlNpvp3NheoooJAzTi+ atmHzmvhn4hVQuoFDv7s/r/Wt0vU7j40FkMBnUEtkwLdIDpoSMYl/brntavvAWZ5d0VrTnwE 94G/SRNc2ntDLNRi4mWaI4I0jLkuWUGhtM8sjZhwbTbwP2B4XTERumQAtLDTSDW2TtGG9i9K JSbRVJbrdozpf3WQxBWHesdJPi7SAhFLL2wFAJ9+1YLEJq9jZdmuFK8SZUyRi/da3wkM3CRW xFenjznNgIgjravRhVc/ky2CEIfciDsYy0ctAkCZW+1+MqLloajBxRHbn8ff/LIcxLGEwFKA lmxLCi4r5AqXI8hXxQARAQABwsF8BBgBCgAmFiEE0Q8H4pTaquD/kXaIsyfxn+T7+bAFAlpT JOACGwwFCQHWp4AACgkQsyfxn+T7+bB2PRAAjMdf1YhCUQ9BE+MlZwI/Gm9+Yas/jMyr1PcZ 87/p36pSCKjv1LRcS0qhgK8hdOK3VoCb2qGrbb3vq8cWq+pw2yBPYqCNbPLwvsLk6Ssw9RXA OhLyeD5imae1gEKhEb1z/F8vTCAB8M+Z+8RJqxLBdBwUuQaJN9Q4Y2Rh0XtaymCfXqQo0pQX KjQ9WF5evYMWh0BFC2BPA6J5GAvaN5tmmqhBHSGiUt6/B95r7qrAXxz3GLjtKZ4B4T3UH9Ze eeNmn1OYjKzRRdGlNqQ0iM18+q+gOP/Uyo+Q3At+7tQS1hxH7372AvMHugV4unqCXmK8TEaD FQI3ELzX+8e4gFPFe+KIA4AFyRqYf+BX4V6MglJWNpddJpdUFSiC4eVZub5mOG3quxlWObOU GAioldmxTDdtixcPoKYrL00qObHcY9kgysvkSq8/C1d/Cfk3eOb3HHPf95I2cRT3qrfiQcYI twaKj0nsnvxgqgHbqJ4Qg11OYABnidRWyw7r9D/dUncaAwSGTtdsmgL9LUFDjC6lBnP2nYRm jK+Pgm0nuvq46FrvqSa48GPeTO2lriAPWPgcJ7RC6wqKQ5rp/XZQBsBiLmM605VnuXZX9RAq PZasS+tgMbXLdNHKomgPjh9vh3nlaYMdl9Al0qCTII8FzBHy3AGV7mZ3KMwQESsAtNEbh4s= Message-ID: <3ea28895-927b-6f15-76a2-260dcc39790e@tu-dresden.de> Date: Thu, 16 Aug 2018 16:36:46 +0200 MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="aYUMRksI8csmJdnmNCzAMKc1pFxZtemZT" X-TUD-Original-From: dominik.pataky@tu-dresden.de X-TUD-Virus-Scanned: mailout5.zih.tu-dresden.de Archived-At: X-Mailman-Approved-At: Thu, 16 Aug 2018 17:50:58 -0700 Subject: [spring] Segment Routing & SRv6 research/summary paper X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 16 Aug 2018 15:50:05 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --aYUMRksI8csmJdnmNCzAMKc1pFxZtemZT Content-Type: multipart/mixed; boundary="Cay7l5qKOwfVqedD76y5D6FLFVYzAdPXw"; protected-headers="v1" From: Dominik Pataky To: spring@ietf.org Message-ID: <3ea28895-927b-6f15-76a2-260dcc39790e@tu-dresden.de> Subject: Segment Routing & SRv6 research/summary paper --Cay7l5qKOwfVqedD76y5D6FLFVYzAdPXw Content-Type: text/plain; charset=utf-8 Content-Language: de-DE Content-Transfer-Encoding: quoted-printable Dear SPRING list, I'm a student at the TU Dresden, Germany, and recently finished my short research/summary paper on the topic =E2=80=9ESegment Routing and SRv6: Origins, State-of-the-Art and Outlook=E2=80=9C. Maybe some of you are int= erested in it. Feedback is also very welcome! The document is released under CC BY-SA 4.0 and available online at https://dpataky.eu/segment-routing-paper Best regards, Dominik Pataky --Cay7l5qKOwfVqedD76y5D6FLFVYzAdPXw-- --aYUMRksI8csmJdnmNCzAMKc1pFxZtemZT Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEaDCceWd48hIV1IvTKvhG9R8IDv4FAlt1i/8ACgkQKvhG9R8I Dv5Abw/9Eo0DSIOdiH+eEHQHYigIFfCR8LL0TNAOFQaRmW8vnwNyIXtOzT26BoYo pw/OmLXM+JzAJ3IJ24jKb29kRzy05zE6WvphaFY0bhvA+Q4cb3kiEpYpFyA+SeEe 4P7KABLOvn66hxqifI0eaMDa8mm23v6pR1uW+0/xrBY2r5s745LXCsHot/ADgm7T +As3PPDzBQfmbOC082FMzH50rtMFKr1emYu0nCC1gXQcmAc8IotZl3Ft3aix4ukr mklnUdsSaYZM9N0aVFB9Mqxgv247kAmOH2wLINaibGWIq7xnsJTucacoKJHGBCpp C+YQVJytiqr27eed+VE+7im8C8ph/S9Vh52tIa5s4u9SlkNS1cGbX7e/kgID3wPm AvSUk88MJ/iUOceNXLDH9hiNGDZXYJIqjwi9DriRe38oRad4c+isd5dExjKR5oSl uEg0d6o4rmGVNKEzus3abXpKZjpEJGA8RCmYYKwhGeKia36on9G76A0LYStXMnZi 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id 188-v6mr3571592oih.58.1535558941320; Wed, 29 Aug 2018 09:09:01 -0700 (PDT) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Wed, 29 Aug 2018 09:09:00 -0700 From: Alvaro Retana In-Reply-To: <20180726202715.GA91950@kduck.kaduk.org> References: <152951284387.28600.11874107921186798735.idtracker@ietfa.amsl.com> <22642_1531139781_5B4356C5_22642_217_1_53C29892C857584299CBF5D05346208A47AE54BA@OPEXCLILM21.corporate.adroot.infra.ftgroup> <20180709225252.GD59001@kduck.kaduk.org> <31682_1531226969_5B44AB59_31682_103_1_53C29892C857584299CBF5D05346208A47AE73C4@OPEXCLILM21.corporate.adroot.infra.ftgroup> <20180710141101.GP59001@kduck.kaduk.org> <20180726202715.GA91950@kduck.kaduk.org> X-Mailer: Airmail (506) MIME-Version: 1.0 Date: Wed, 29 Aug 2018 09:09:00 -0700 Message-ID: To: Benjamin Kaduk , Ahmed Bashandy Cc: "draft-ietf-spring-segment-routing-ldp-interop@ietf.org" , Rob Shakir , bruno.decraene@orange.com, "spring-chairs@ietf.org" , "spring@ietf.org" , The IESG Content-Type: multipart/alternative; boundary="0000000000003aa9d10574952d11" Archived-At: Subject: Re: [spring] Benjamin Kaduk's Discuss on draft-ietf-spring-segment-routing-ldp-interop-13: (with DISCUSS and COMMENT) X-BeenThere: spring@ietf.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Source Packet Routing in NetworkinG \(SPRING\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 29 Aug 2018 16:09:09 -0000 --0000000000003aa9d10574952d11 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Ahmed: Ping!! We=E2=80=99re really close=E2=80=A6 Alvaro. On July 26, 2018 at 4:27:25 PM, Benjamin Kaduk (kaduk@mit.edu) wrote: Hi Ahmed, Thanks for posting the update (and sorry for only getting to it now). The two specific points I raised in my DISCUSS ballot are properly addressed, but before I go clear that I was hoping you could help me remember why the following text was removed when going from -13 to -14: [...] Because this document recognizes that miscofiguration and/or programming may result in false or conflicting label binding advertisements, thereby compromising traffic forwarding, the document recommends strict configuration/ programmability control as well as montoring the SID advertised and log/error messages by the operator to avoid or at least significantly minimize the possibility of such risk. I couldn't find anything in my email history that helped jog my memory. Thanks, Benjamin On Mon, Jul 16, 2018 at 02:10:37PM -0700, Ahmed Bashandy wrote: > Hi, > > I just posted version 14 > https://www.ietf.org/id/draft-ietf-spring-segment-routing-ldp-interop-14.tx= t > > Thanks > > Ahmed > > > > On 7/10/18 7:11 AM, Benjamin Kaduk wrote: > > Hi Bruno, > > > > Thanks for the additional clarifications in the suggested text -- it looks > > good to me, so you and Ahmed should please go ahead with it (once > > submissions open up again). > > > > -Benjamin > > > > On Tue, Jul 10, 2018 at 12:49:28PM +0000, bruno.decraene@orange.com wrote: > >> Hi Benjamin, > >> > >> Thanks for the discussion. > >> Please see inline [Bruno2] > >> > >>> From: Benjamin Kaduk [mailto:kaduk@mit.edu] > >> > Sent: Tuesday, July 10, 2018 12:53 AM > >> > On Mon, Jul 09, 2018 at 12:36:20PM +0000, bruno.decraene@orange.com wrote: > >> > > Hi Benjamin, > >> > > > >> > > Thanks for your comments. > >> > > Please see inline another addition to Ahmed's answer. [Bruno] > >> > > > >> > > > From: Ahmed Bashandy [mailto:abashandy.ietf@gmail.com] > >> > > > Sent: Monday, July 09, 2018 2:30 AM > >> > > > > >> > > > Hi > >> > > > Thanks for the review > >> > > > > >> > > > See reply to the comment at #Ahmed > >> > > > > >> > > > Ahmed > >> > > > > >> > > > > >> > > > On 6/20/18 9:40 AM, Benjamin Kaduk wrote: > >> > > > > Benjamin Kaduk has entered the following ballot position for > >> > > > > draft-ietf-spring-segment-routing-ldp-interop-13: Discuss > >> > > > > > >> > > > > When responding, please keep the subject line intact and reply to all > >> > > > > email addresses included in the To and CC lines. (Feel free to cut this > >> > > > > introductory paragraph, however.) > >> > > > > > >> > > > > > >> > > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > >> > > > > for more information about IESG DISCUSS and COMMENT positions. > >> > > > > > >> > > > > > >> > > > > The document, along with other ballot positions, can be found here: > >> > > > > https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-ldp-inte= rop/ > >> > > > > > >> > > > > > >> > > > > > >> > > > > ---------------------------------------------------------------------- > >> > > > > DISCUSS: > >> > > > > ---------------------------------------------------------------------- > >> > > > > > >> > > > > I may be missing something, but I don't see anything that says whether the > >> > > > > preference field introduced in Section 3.2.3 uses larger values or smaller > >> > > > > values for more-preferred SRMSes. > >> > > > #Ahmed: > >> > > > If I understand this statement correctly, the concern is about which > >> > > > label(s) get assigned to which prefix(es). This concern is addressed as > >> > > > follows > >> > > > > >> > > > From the MPLS architecture point of view, there is nothing wrong in > >> > > > having multiple labels for the same prefix. Segment routing in general > >> > > > and this document in particular did not introduce this behavior nor did > >> > > > they prohibit/restrict/relax it. For example, an implementation that > >> > > > allows the operator to locally assign multiple local labels to the same > >> > > > prefix may continue to apply this behavior whether the platform supports > >> > > > segment routing or not, in which case it is up to the implementation > >> > > > and/or the configuration affecting the MPLS forwarding plane to specify > >> > > > how to behave when multiple labels are assigned to the same prefix. Such > >> > > > behavior is a general MPLS behavior that outside the scope of and is not > >> > > > modified by segment routing. > >> > > > > >> > > > However the opposite, where the same label gets assigned to multiple > >> > > > prefixes resulting in label collision is problematic. This document > >> > > > prohibits label collision resulting from the use of SRMS (which is > >> > > > introduced by this document) in the first bullet starting at the 3rd > >> > > > line of page 12: > >> > > > "- If there is an incoming label collision as specified in > >> > > > [I-D.ietf-spring-segment-routing-mpls] , apply the steps specified > >> > > > in [I-D.ietf-spring-segment-routing-mpls] to resolve the > >> > > > collision."" > >> > > > > >> > > > > > >> > > > > > >> > > > > The introduction of the SRMS is also introducing a new way for a protocol > >> > > > > participant to make claims about route prefixes directed at "third parties" > >> > > > > (non-MS, non-MC routers). While routing protocols in general do require high > >> > > > > levels of trust in all participants in order for proper routing to occur, this > >> > > > > addition seems to create a "first among equals" situation that could be called > >> > > > > out more clearly in the security considerations. (I do appreciate that the > >> > > > > requirement for preferring SIDs advertised in prefix reachability > >> > > > > advertisements over those advertised in mapping server advertisements does help > >> > > > > alleviate some of the risk.) > >> > > > >> > > [Bruno] > >> > > 1) As the SID attached to the prefix reachability is more preferred than the SID advertised by the > >> > SRMS, I would kind of argue that the SRMS is more "last among equals" :-) > >> > > 2) I agree that routing protocols, especially Link State Internal Routing Protocols, do require high > >> > levels of trusts among participants. In particular, please note that any node can already advertise > >> > any IP prefix (with any attached SID), and with any metric/cost, hence attracting the traffic. In this > >> > regards, I don't really see an increased risk in IGP routing. > >> > > >> > I don't really see an increased risk per se, either (since all routers can > >> > break routing in all sorts of ways), but I do see a new mechanism by which > >> > certain routers can cause routing breakage. So I was thinking "first among > >> > equals" in terms of "more ways to break things", not "can break things with > >> > a larger magnitude of breakage". You are right that the preference order > >> > that Ahmed described does mean that this new "mechanism for breakage" is > >> > only applicable when there are no explicit prefix-SID advertisements > >> > received via the IGP. So in that sense this new mechanism for breakage is > >> > "last among equals", as you say, because it can only take effect if the IGP > >> > leaves room for it. > >> > >> [Bruno2] Ack; I believe we are in sync. > >> > >> > > 3) I agree that SRMS allows for a "centralized" SID advertisement. I personally don't feel that this > >> > is more risky than a "centralized" BGP Route Reflector. However, I'm not against raising this in the > >> > security consideration section. > >> > > Please see below a proposed text. Please comment/propose text as required. > >> > > > >> > > OLD: > >> > > This document introduces another form of label binding > >> > > advertisements. The security associated with these advertisement is > >> > > part of the security applied to routing protocols such as IS-IS > >> > > [RFC5304] and OSPF [RFC5709] which both optionally make use of > >> > > cryptographic authentication mechanisms. This document also > >> > > specifies a mechanism by which the ill effects of advertising > >> > > conflicting label bindings can be mitigated. > >> > > > >> > > NEW: > >> > > This document introduces another form of label binding > >> > > advertisements. The security associated with these advertisements is > >> > > part of the security applied to routing protocols such as IS-IS > >> > > [RFC5304] and OSPF [RFC5709] which both optionally make use of > >> > > cryptographic authentication mechanisms. > >> > > This form of advertisement is more centralized, on behalf of the node advertising the IP > >> > reachability. > >> > > This document also > >> > > specifies a mechanism by which the ill effects of advertising > >> > > conflicting label bindings can be mitigated. In particular, advertisements from the node > >> > advertsising the IP reachability is more preference than the centralized one. > >> > > >> > I think that's enough to resolve my DISCUSS point. I would prefer if there > >> > was a little bit more text, such as "more centralized, on behalf of the > >> > node advertising the IP reachability, which presents a different risk > >> > profile than existing mechanisms for distributing label bindings", but your > >> > version does cover the key point. > >> > >> [Bruno2] ok. Proposed NEW2: > >> > >> This document introduces another form of label binding > >> advertisements. The security associated with these advertisements is > >> part of the security applied to routing protocols such as IS-IS > >> [RFC5304] and OSPF [RFC5709] which both optionally make use of > >> cryptographic authentication mechanisms. > >> This form of advertisement is more centralized, on behalf of the node advertising the IP reachability, which presents a different risk profile. > >> This document also > >> specifies a mechanism by which the ill effects of advertising > >> conflicting label bindings can be mitigated. In particular, advertisements from the node advertising the IP reachability is more preferred than the centralized one. > >> > >> > >> > >> In short, I used your proposed text but removed " than existing mechanisms for distributing label bindings" as this could be read as "LDP". We could add more text to distinguish, but IMO the current text seems fine. > >> > >> > >> > (And to be clear, I am not trying to say > >> > that the centralized risk is better or worse in all cases; it's just > >> > different, so we should call that out to the reader and inform their decision > >> > making.) > >> > >> [Bruno2] In sync. I agree with you that we should call that out to the reader and inform their decision making. Thanks for bringing the comment. > >> I'll work with Ahmed, to have the draft reflect this, as he has the pen. > >> > >> Thanks, > >> Bruno > >> > >> > >> > Thanks, > >> > > >> > Benjamin > >> > > >> > > > >> > > Thanks, > >> > > --Bruno > >> > > > >> > > > #Ahmed: > >> > > > If I understand your comment, the concern is about > >> > > > "first-come-first-serve" behavior. I believe this concern is addressed > >> > > > as follows > >> > > > (1) The sentence starting at the fourth line of the second paragraph in > >> > > > page 10 says: > >> > > > For a given prefix, if an MC receives an SR mapping advertisement > >> > > > from a mapping server and also has received a prefix-SID > >> > > > advertisement for that same prefix in a prefix reachability > >> > > > advertisement, then the MC MUST prefer the SID advertised in the > >> > > > prefix reachability advertisement over the mapping server > >> > > > advertisement i.e., the mapping server advertisment MUST be ignored > >> > > > for that prefix. > >> > > > > >> > > > (2) The last bullet at the bottom of page 11 says: > >> > > > - For any prefix for which it did not receive a prefix-SID > >> > > > advertisement, the MCC applies the SRMS mapping advertisments with > >> > > > the highest preference. > >> > > > > >> > > > (3) The first bullet near the top pf page 12 says: > >> > > > - If there is an incoming label collision as specified in > >> > > > [I-D.ietf-spring-segment-routing-mpls] , apply the steps specified > >> > > > in [I-D.ietf-spring-segment-routing-mpls] to resolve the > >> > > > collision. > >> > > > > >> > > > So for the same set of received advertisements (SRMS advertisements, > >> > > > prefix-SID advertisements, or combination of both), the same set of > >> > > > labels will be assigned to the same prefix. As mentioned in my previous > >> > > > comments, if multiple labels get assigned to the same prefix, the > >> > > > behavior is not related to segment routing > >> > > > > >> > > > Regarding placing a comment in the security section, IMO a specification > >> > > > of which advertisement(s) to use when receiving multiple (conflicting or > >> > > > non-conflicting) advertisements has nothing to do with security. It is > >> > > > an externally visible protocol(s) behavior that should be specified in > >> > > > the sections covering the protocol(s) themselves rather than security > >> > > > consideration of the protocol(s). > >> > > > > >> > > > But if you still think there is a need to mention something in the > >> > > > security section, a suggestion from your side will be greatly appreciated . > >> > > > > > >> > > > > > >> > > > > ---------------------------------------------------------------------- > >> > > > > COMMENT: > >> > > > > ---------------------------------------------------------------------- > >> > > > > > >> > > > > I support Alissa's suggestion about the text covering cryptographic authentication. > >> > > > #Ahmed: I modified the statement as Alissa suggested in version 14 that > >> > > > will be published in the next 1-2 days > >> > > > > > >> > > > > "[100,300]" and "(100,200)" are each used as an example SRGB. In > >> > > > > some contexts the round versus square brackets indicate a > >> > > > > distinction between "closed" (includes endpoints) and "open" (does > >> > > > > not include endpoints) intervals. If there's no need to make such a > >> > > > > distinction, I suggest standardizing one one format. > >> > > > #Ahmed: I changed both of them to use [] in version because we mean > >> > > > inclusive > >> > > > > > >> > > > > As was mentioned in the secdir review, it would be good to expand FEC and LFA on first > >> > usage. > >> > > > #Ahmed: Corrected in version 14 that will be published in the next 1-2 days > >> > > > > > >> > > > > Section 1 > >> > > > > > >> > > > > Section 2 describes the co-existence of SR with other MPLS Control > >> > > > > Plane. [...] > >> > > > > > >> > > > > nit: "other MPLS Control Plane" seems to be an incomplete compound noun > >> > > > > -- is it other control plane technologies that are being considered? > >> > > > #Ahmed: I added "protocols" in version 14 to clarify that > >> > > > > > >> > > > > Section 2 > >> > > > > > >> > > > > Note that this static label allocation capability of the label > >> > > > > manager exists for many years across several vendors and hence is not > >> > > > > new. Furthermore, note that the label-manager ability to statically > >> > > > > allocate a range of labels to a specific application is not new > >> > > > > either. [...] > >> > > > > > >> > > > > nits: "has existed", "label-manager's ability". > >> > > > #Ahmed: Corrected (thanks a lot) > >> > > > > > >> > > > > Section 2.1 > >> > > > > > >> > > > > MPLS2MPLS refers the forwarding behavior where a router receives an > >> > > > > labeled packet and switches it out as a labeled packet. Several > >> > > > > > >> > > > > nit: "refers to", "a labeled packet" > >> > > > #Ahmed: Corrected > >> > > > > > >> > > > > Section 3.2 > >> > > > > > >> > > > > This section defines the Segment Routing Mapping Server (SRMS). The > >> > > > > SRMS is a IGP node advertising mapping between Segment Identifiers > >> > > > > (SID) and prefixes advertised by other IGP nodes. The SRMS uses a > >> > > > > dedicated IGP extension (IS-IS, OSPF and OSPFv3) which is protocol > >> > > > > specific and defined in [I-D.ietf-isis-segment-routing-extensions], > >> > > > > [I-D.ietf-ospf-segment-routing-extensions], and > >> > > > > [I-D.ietf-ospf-ospfv3-segment-routing-extensions]. > >> > > > > > >> > > > > nit: Perhaps "IS-IS, OSPFv2, and OSPFv3 are currently supported" is a > >> > > > > better parenthetical? > >> > > > #Ahmed: Corrected in the next version > >> > > > > > >> > > > > The example diagram depicted in Figure 3 assumes that the operator > >> > > > > configures P5 to act as a Segment Routing Mapping Server (SRMS) and > >> > > > > advertises the following mappings: (P7, 107), (P8, 108), (PE3, 103) > >> > > > > and (PE4, 104). > >> > > > > > >> > > > > nit: I think this is Figure 2. > >> > > > #Ahmed: Corrected in the next version > >> > > > > > >> > > > > Section 3.2.1 > >> > > > > > >> > > > > [...] Examples > >> > > > > of explicit prefix-SID advertisment are the prefix-SID sub-TLVs > >> > > > > defined in ([I-D.ietf-isis-segment-routing-extensions], > >> > > > > [I-D.ietf-ospf-segment-routing-extensions], and > >> > > > > [I-D.ietf-ospf-ospfv3-segment-routing-extensions]). > >> > > > > > >> > > > > Would draft-ietf-idr-bgp-prefix-sid (also on this week's telechat) > >> > > > > be appropriate for inclusion in this list? > >> > > > > > >> > > > > for that prefix. Hence assigning a prefix-SID to a prefix using the > >> > > > > SRMS functionality does not preclude assigning the same or different > >> > > > > prefix-SID(s) to the same prefix using explict prefix-SID > >> > > > > advertisement such as the aforementioned prefix-SID sub-TLV. > >> > > > #Ahmed: The SRMS functionality is specific to IGPs as mentioned in the > >> > > > second sentence of the second paragraph in Section 3.2 > >> > > > > > >> > > > > nit: I think the aforementioned things were a list, so "sub-TLVs" plural > >> > > > > would be appropriate. > >> > > > > > >> > > > > Including the name for IS-IS TLV 135 might be helpful for the > >> > > > > reader. > >> > > > > > >> > > > #Ahmed: Corrected as suggested in the next version > >> > > > >> > > > >> > > > >> > ___________________________________________________________________________= _____ > >> > _________________________________________ > >> > > > >> > > Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou > >> > privilegiees et ne doivent donc > >> > > pas etre diffuses, exploites ou copies sans autorisation. 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Les messages electroniques etant susceptibles d'alteration, > >> Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. > >> > >> This message and its attachments may contain confidential or privileged information that may be protected by law; > >> they should not be distributed, used or copied without authorisation. > >> If you have received this email in error, please notify the sender and delete this message and its attachments. > >> As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified. > >> Thank you. > >> > --0000000000003aa9d10574952d11 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =
Ahmed: Ping!!

We=E2=80=99re really close=E2=80=A6

Alvaro.

On July 26, 2018 at 4:27:25 PM, Benjamin Kaduk (kaduk@mit.edu) wrote:

Hi Ahmed,

Thanks for posting the update (and sorry for only getting to it now).

The two specific points I raised in my DISCUSS ballot are properly
addressed, but before I go clear that I was hoping you could help me
remember why the following text was removed when going from -13 to -14:

[...] Because this document recognizes that
miscofiguration and/or programming may result in false or conflictin= g
label binding advertisements, thereby compromising traffic
forwarding, the document recommends strict configuration/
programmability control as well as montoring the SID advertised and
log/error messages by the operator to avoid or at least significantl= y
minimize the possibility of such risk.

I couldn't find anything in my email history that helped jog my mem= ory.

Thanks,

Benjamin

On Mon, Jul 16, 2018 at 02:10:37PM -0700, Ahmed Bashandy wrote:
> Hi,
> =20
> I just posted version 14
> https://www.ietf.org/id/draft-ietf-spring-segment-ro= uting-ldp-interop-14.txt
> =20
> Thanks
> =20
> Ahmed
> =20
> =20
> =20
> On 7/10/18 7:11 AM, Benjamin Kaduk wrote:
> > Hi Bruno,
> >
> > Thanks for the additional clarifications in the suggested tex= t -- it looks
> > good to me, so you and Ahmed should please go ahead with it (= once
> > submissions open up again).
> >
> > -Benjamin
> >
> > On Tue, Jul 10, 2018 at 12:49:28PM +0000, bruno.decraene@orange.com wrote:
> >> Hi Benjamin,
> >>
> >> Thanks for the discussion.
> >> Please see inline [Bruno2]
> >>
> >>> From: Benjamin Kaduk [mailto:kaduk@mit.edu]
> >> > Sent: Tuesday, July 10, 2018 12:53 AM
> >> > On Mon, Jul 09, 2018 at 12:36:20PM +0000, bruno.decraene@orange.com wrote:
> >> > > Hi Benjamin,
> >> > >
> >> > > Thanks for your comments.
> >> > > Please see inline another addition to Ahmed&#= 39;s answer. [Bruno]
> >> > >
> >> > > > From: Ahmed Bashandy [mailto:abashandy.ietf@gmail.com]
> >> > > > Sent: Monday, July 09, 2018 2:30 AM
> >> > > >
> >> > > > Hi
> >> > > > Thanks for the review
> >> > > >
> >> > > > See reply to the comment at #Ahmed
> >> > > >
> >> > > > Ahmed
> >> > > >
> >> > > >
> >> > > > On 6/20/18 9:40 AM, Benjamin Kaduk wrot= e:
> >> > > > > Benjamin Kaduk has entered the fol= lowing ballot position for
> >> > > > > draft-ietf-spring-segment-routing-= ldp-interop-13: Discuss
> >> > > > >
> >> > > > > When responding, please keep the s= ubject line intact and reply to all
> >> > > > > email addresses included in the To= and CC lines. (Feel free to cut this
> >> > > > > introductory paragraph, however.)
> >> > > > >
> >> > > > >
> >> > > > > Please refer to https://www.ietf.org/ie= sg/statement/discuss-criteria.html
> >> > > > > for more information about IESG DI= SCUSS and COMMENT positions.
> >> > > > >
> >> > > > >
> >> > > > > The document, along with other bal= lot positions, can be found here:
> >> > > > > https://datatrack= er.ietf.org/doc/draft-ietf-spring-segment-routing-ldp-interop/
> >> > > > >
> >> > > > >
> >> > > > >
> >> > > > > ----------------------------------= ------------------------------------
> >> > > > > DISCUSS:
> >> > > > > ----------------------------------= ------------------------------------
> >> > > > >
> >> > > > > I may be missing something, but I = don't see anything that says whether the
> >> > > > > preference field introduced in Sec= tion 3.2.3 uses larger values or smaller
> >> > > > > values for more-preferred SRMSes.
> >> > > > #Ahmed:
> >> > > > If I understand this statement correctl= y, the concern is about which
> >> > > > label(s) get assigned to which prefix(e= s). This concern is addressed as
> >> > > > follows
> >> > > >
> >> > > > From the MPLS architecture point of vi= ew, there is nothing wrong in
> >> > > > having multiple labels for the same pre= fix. Segment routing in general
> >> > > > and this document in particular did not= introduce this behavior nor did
> >> > > > they prohibit/restrict/relax it. For ex= ample, an implementation that
> >> > > > allows the operator to locally assign m= ultiple local labels to the same
> >> > > > prefix may continue to apply this behav= ior whether the platform supports
> >> > > > segment routing or not, in which case i= t is up to the implementation
> >> > > > and/or the configuration affecting the = MPLS forwarding plane to specify
> >> > > > how to behave when multiple labels are = assigned to the same prefix. Such
> >> > > > behavior is a general MPLS behavior tha= t outside the scope of and is not
> >> > > > modified by segment routing.
> >> > > >
> >> > > > However the opposite, where the same la= bel gets assigned to multiple
> >> > > > prefixes resulting in label collision i= s problematic. This document
> >> > > > prohibits label collision resulting fro= m the use of SRMS (which is
> >> > > > introduced by this document) in the fir= st bullet starting at the 3rd
> >> > > > line of page 12:
> >> > > > =C2=A0 "-=C2=A0 If there is an in= coming label collision as specified in
> >> > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [I-D.ie= tf-spring-segment-routing-mpls] , apply the steps specified
> >> > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 in [I-D= .ietf-spring-segment-routing-mpls] to resolve the
> >> > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 collisi= on.""
> >> > > >
> >> > > > >
> >> > > > >
> >> > > > > The introduction of the SRMS is al= so introducing a new way for a protocol
> >> > > > > participant to make claims about r= oute prefixes directed at "third parties"
> >> > > > > (non-MS, non-MC routers). While r= outing protocols in general do require high
> >> > > > > levels of trust in all participant= s in order for proper routing to occur, this
> >> > > > > addition seems to create a "f= irst among equals" situation that could be called
> >> > > > > out more clearly in the security c= onsiderations. (I do appreciate that the
> >> > > > > requirement for preferring SIDs ad= vertised in prefix reachability
> >> > > > > advertisements over those advertis= ed in mapping server advertisements does help
> >> > > > > alleviate some of the risk.)
> >> > >
> >> > > [Bruno]
> >> > > 1) As the SID attached to the prefix reachabi= lity is more preferred than the SID advertised by the
> >> > SRMS, I would kind of argue that the SRMS is more = "last among equals" :-)
> >> > > 2) I agree that routing protocols, especially= Link State Internal Routing Protocols, do require high
> >> > levels of trusts among participants. In particular= , please note that any node can already advertise
> >> > any IP prefix (with any attached SID), and with an= y metric/cost, hence attracting the traffic. In this
> >> > regards, I don't really see an increased risk = in IGP routing.
> >> >
> >> > I don't really see an increased risk per se, e= ither (since all routers can
> >> > break routing in all sorts of ways), but I do see = a new mechanism by which
> >> > certain routers can cause routing breakage. So I = was thinking "first among
> >> > equals" in terms of "more ways to break = things", not "can break things with
> >> > a larger magnitude of breakage". You are rig= ht that the preference order
> >> > that Ahmed described does mean that this new "= ;mechanism for breakage" is
> >> > only applicable when there are no explicit prefix-= SID advertisements
> >> > received via the IGP. So in that sense this new m= echanism for breakage is
> >> > "last among equals", as you say, because= it can only take effect if the IGP
> >> > leaves room for it.
> >> =20
> >> [Bruno2] Ack; I believe we are in sync.
> >> =20
> >> > > 3) I agree that SRMS allows for a "centr= alized" SID advertisement. I personally don't feel that this
> >> > is more risky than a "centralized" BGP R= oute Reflector. However, I'm not against raising this in the
> >> > security consideration section.
> >> > > Please see below a proposed text. Please comm= ent/propose text as required.
> >> > >
> >> > > OLD:
> >> > > This document introduces another form of lab= el binding
> >> > > advertisements. The security associated w= ith these advertisement is
> >> > > part of the security applied to routing pr= otocols such as IS-IS
> >> > > [RFC5304] and OSPF [RFC5709] which both op= tionally make use of
> >> > > cryptographic authentication mechanisms. = This document also
> >> > > specifies a mechanism by which the ill eff= ects of advertising
> >> > > conflicting label bindings can be mitigate= d.
> >> > >
> >> > > NEW:
> >> > > This document introduces another form of l= abel binding
> >> > > advertisements. The security associated wi= th these advertisements is
> >> > > part of the security applied to routing pr= otocols such as IS-IS
> >> > > [RFC5304] and OSPF [RFC5709] which both op= tionally make use of
> >> > > cryptographic authentication mechanisms.
> >> > > This form of advertisement is more central= ized, on behalf of the node advertising the IP
> >> > reachability.
> >> > > This document also
> >> > > specifies a mechanism by which the ill eff= ects of advertising
> >> > > conflicting label bindings can be mitigate= d. In particular, advertisements from the node
> >> > advertsising the IP reachability is more preferenc= e than the centralized one.
> >> >
> >> > I think that's enough to resolve my DISCUSS po= int. I would prefer if there
> >> > was a little bit more text, such as "more cen= tralized, on behalf of the
> >> > node advertising the IP reachability, which presen= ts a different risk
> >> > profile than existing mechanisms for distributing = label bindings", but your
> >> > version does cover the key point.
> >>
> >> [Bruno2] ok. Proposed NEW2:
> >>
> >> This document introduces another form of label binding
> >> advertisements. The security associated with these advert= isements is
> >> part of the security applied to routing protocols such as= IS-IS
> >> [RFC5304] and OSPF [RFC5709] which both optionally make u= se of
> >> cryptographic authentication mechanisms.
> >> This form of advertisement is more centralized, on behalf= of the node advertising the IP reachability, which presents a different ri= sk profile.
> >> This document also
> >> specifies a mechanism by which the ill effects of adverti= sing
> >> conflicting label bindings can be mitigated. In particula= r, advertisements from the node advertising the IP reachability is more pre= ferred than the centralized one.
> >>
> >>
> >>
> >> In short, I used your proposed text but removed " th= an existing mechanisms for distributing label bindings" as this could = be read as "LDP". We could add more text to distinguish, but IMO = the current text seems fine.
> >>
> >>
> >> > (And to be clear, I am not trying to say
> >> > that the centralized risk is better or worse in al= l cases; it's just
> >> > different, so we should call that out to the reade= r and inform their decision
> >> > making.)
> >>
> >> [Bruno2] In sync. I agree with you that we should call th= at out to the reader and inform their decision making. Thanks for bringing = the comment.
> >> I'll work with Ahmed, to have the draft reflect this,= as he has the pen.
> >>
> >> Thanks,
> >> Bruno
> >>
> >> =20
> >> > Thanks,
> >> >
> >> > Benjamin
> >> >
> >> > >
> >> > > Thanks,
> >> > > --Bruno
> >> > >
> >> > > > #Ahmed:
> >> > > > If I understand your comment, the conce= rn is about
> >> > > > "first-come-first-serve" beha= vior. I believe this concern is addressed
> >> > > > as follows
> >> > > > (1) The sentence starting at the fourth= line of the second paragraph in
> >> > > > page 10 says:
> >> > > > =C2=A0=C2=A0 For a given prefix, if an= MC receives an SR mapping advertisement
> >> > > > =C2=A0=C2=A0 from a mapping server and= also has received a prefix-SID
> >> > > > =C2=A0=C2=A0 advertisement for that sa= me prefix in a prefix reachability
> >> > > > =C2=A0=C2=A0 advertisement, then the M= C MUST prefer the SID advertised in the
> >> > > > =C2=A0=C2=A0 prefix reachability adver= tisement over the mapping server
> >> > > > =C2=A0=C2=A0 advertisement i.e., the m= apping server advertisment MUST be ignored
> >> > > > =C2=A0=C2=A0 for that prefix.
> >> > > >
> >> > > > (2) The last bullet at the bottom of pa= ge 11 says:
> >> > > > =C2=A0=C2=A0 -=C2=A0 For any prefix fo= r which it did not receive a prefix-SID
> >> > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 adverti= sement, the MCC applies the SRMS mapping advertisments with
> >> > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 the hig= hest preference.
> >> > > >
> >> > > > (3) The first bullet near the top pf pa= ge 12 says:
> >> > > > =C2=A0=C2=A0 -=C2=A0 If there is an in= coming label collision as specified in
> >> > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [I-D.ie= tf-spring-segment-routing-mpls] , apply the steps specified
> >> > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 in [I-D= .ietf-spring-segment-routing-mpls] to resolve the
> >> > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 collisi= on.
> >> > > >
> >> > > > So for the same set of received adverti= sements (SRMS advertisements,
> >> > > > prefix-SID advertisements, or combinati= on of both), the same set of
> >> > > > labels will be assigned to the same pre= fix. As mentioned in my previous
> >> > > > comments, if multiple labels get assign= ed to the same prefix, the
> >> > > > behavior is not related to segment rout= ing
> >> > > >
> >> > > > Regarding placing a comment in the secu= rity section, IMO a specification
> >> > > > of which advertisement(s) to use when r= eceiving multiple (conflicting or
> >> > > > non-conflicting) advertisements has not= hing to do with security. It is
> >> > > > an externally visible protocol(s) behav= ior that should be specified in
> >> > > > the sections covering the protocol(s) t= hemselves rather than security
> >> > > > consideration of the protocol(s).
> >> > > >
> >> > > > But if you still think there is a need = to mention something in the
> >> > > > security section, a suggestion from you= r side will be greatly appreciated .
> >> > > > >
> >> > > > >
> >> > > > > ----------------------------------= ------------------------------------
> >> > > > > COMMENT:
> >> > > > > ----------------------------------= ------------------------------------
> >> > > > >
> >> > > > > I support Alissa's suggestion = about the text covering cryptographic authentication.
> >> > > > #Ahmed: I modified the statement as Ali= ssa suggested in version 14 that
> >> > > > will be published in the next 1-2 days
> >> > > > >
> >> > > > > "[100,300]" and "(1= 00,200)" are each used as an example SRGB. In
> >> > > > > some contexts the round versus squ= are brackets indicate a
> >> > > > > distinction between "closed&q= uot; (includes endpoints) and "open" (does
> >> > > > > not include endpoints) intervals. = If there's no need to make such a
> >> > > > > distinction, I suggest standardizi= ng one one format.
> >> > > > #Ahmed: I changed both of them to use [= ] in version because we mean
> >> > > > inclusive
> >> > > > >
> >> > > > > As was mentioned in the secdir rev= iew, it would be good to expand FEC and LFA on first
> >> > usage.
> >> > > > #Ahmed: Corrected in version 14 that wi= ll be published in the next 1-2 days
> >> > > > >
> >> > > > > Section 1
> >> > > > >
> >> > > > > Section 2 describes the co-exi= stence of SR with other MPLS Control
> >> > > > > Plane. [...]
> >> > > > >
> >> > > > > nit: "other MPLS Control Plan= e" seems to be an incomplete compound noun
> >> > > > > -- is it other control plane techn= ologies that are being considered?
> >> > > > #Ahmed: I added "protocols" i= n version 14 to clarify that
> >> > > > >
> >> > > > > Section 2
> >> > > > >
> >> > > > > Note that this static label al= location capability of the label
> >> > > > > manager exists for many years = across several vendors and hence is not
> >> > > > > new. Furthermore, note that t= he label-manager ability to statically
> >> > > > > allocate a range of labels to = a specific application is not new
> >> > > > > either. [...]
> >> > > > >
> >> > > > > nits: "has existed", &qu= ot;label-manager's ability".
> >> > > > #Ahmed: Corrected (thanks a lot)
> >> > > > >
> >> > > > > Section 2.1
> >> > > > >
> >> > > > > MPLS2MPLS refers the forwardin= g behavior where a router receives an
> >> > > > > labeled packet and switches it= out as a labeled packet. Several
> >> > > > >
> >> > > > > nit: "refers to", "= a labeled packet"
> >> > > > #Ahmed: Corrected
> >> > > > >
> >> > > > > Section 3.2
> >> > > > >
> >> > > > > This section defines the Segme= nt Routing Mapping Server (SRMS). The
> >> > > > > SRMS is a IGP node advertising= mapping between Segment Identifiers
> >> > > > > (SID) and prefixes advertised = by other IGP nodes. The SRMS uses a
> >> > > > > dedicated IGP extension (IS-IS= , OSPF and OSPFv3) which is protocol
> >> > > > > specific and defined in [I-D.i= etf-isis-segment-routing-extensions],
> >> > > > > [I-D.ietf-ospf-segment-routing= -extensions], and
> >> > > > > [I-D.ietf-ospf-ospfv3-segment-= routing-extensions].
> >> > > > >
> >> > > > > nit: Perhaps "IS-IS, OSPFv2, = and OSPFv3 are currently supported" is a
> >> > > > > better parenthetical?
> >> > > > #Ahmed: Corrected in the next version
> >> > > > >
> >> > > > > The example diagram depicted i= n Figure 3 assumes that the operator
> >> > > > > configures P5 to act as a Segm= ent Routing Mapping Server (SRMS) and
> >> > > > > advertises the following mappi= ngs: (P7, 107), (P8, 108), (PE3, 103)
> >> > > > > and (PE4, 104).
> >> > > > >
> >> > > > > nit: I think this is Figure 2.
> >> > > > #Ahmed: Corrected in the next version
> >> > > > >
> >> > > > > Section 3.2.1
> >> > > > >
> >> > > > > [...] Examples
> >> > > > > of explicit prefix-SID adverti= sment are the prefix-SID sub-TLVs
> >> > > > > defined in ([I-D.ietf-isis-seg= ment-routing-extensions],
> >> > > > > [I-D.ietf-ospf-segment-routing= -extensions], and
> >> > > > > [I-D.ietf-ospf-ospfv3-segment-= routing-extensions]).
> >> > > > >
> >> > > > > Would draft-ietf-idr-bgp-prefix-si= d (also on this week's telechat)
> >> > > > > be appropriate for inclusion in th= is list?
> >> > > > >
> >> > > > > for that prefix. Hence assign= ing a prefix-SID to a prefix using the
> >> > > > > SRMS functionality does not pr= eclude assigning the same or different
> >> > > > > prefix-SID(s) to the same pref= ix using explict prefix-SID
> >> > > > > advertisement such as the afor= ementioned prefix-SID sub-TLV.
> >> > > > #Ahmed: The SRMS functionality is speci= fic to IGPs as mentioned in the
> >> > > > second sentence of the second paragraph= in Section 3.2
> >> > > > >
> >> > > > > nit: I think the aforementioned th= ings were a list, so "sub-TLVs" plural
> >> > > > > would be appropriate.
> >> > > > >
> >> > > > > Including the name for IS-IS TLV 1= 35 might be helpful for the
> >> > > > > reader.
> >> > > > >
> >> > > > #Ahmed: Corrected as suggested in the n= ext version
> >> > >
> >> > >
> >> > >
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> =20
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