From nobody Mon Apr 2 04:35:21 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A063A127444; Mon, 2 Apr 2018 04:35:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.1 X-Spam-Level: X-Spam-Status: No, score=-2.1 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 MRud48DqpmqM; Mon, 2 Apr 2018 04:35:19 -0700 (PDT) Received: from mail-wm0-x235.google.com (mail-wm0-x235.google.com [IPv6:2a00:1450:400c:c09::235]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EA6421250B8; Mon, 2 Apr 2018 04:35:18 -0700 (PDT) Received: by mail-wm0-x235.google.com with SMTP id i3so2671061wmf.3; Mon, 02 Apr 2018 04:35:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc; bh=SsO/6j3Yp+dRwyB0RiekBk150H4Cijwq9jcM9colKh0=; b=nD6znXfvfW3rTahlC/C+OELX7C+dd8xtrqLa84+cgdoDNLX43lAjF9gMU+1q2OpG6S dzmFBwIMDelZHpzdrSMKfLCbrAl6tubryaYYn9p3EtdeBcx4BvBkA/3YUSbRP+e/cq0K MSbqgvN2a6lIWlH/nZ23YFQlGT4zPeY7y2IcPNYpztl/q8Qrrq1atagE8aztnHz8ZWzq 4yOAJK+JJoer+izUXeDD0KAZdVFCMkTkIer87AdJggCI7fODPqzUn6kb7/rOB0/h6TOL KXlF3pFArfYliyG51+RRlEnBaw2/8ERz7ziJKdR3QjypdN5Aw8sa9w1RagSN/P1RF5w/ ihSQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to:cc; bh=SsO/6j3Yp+dRwyB0RiekBk150H4Cijwq9jcM9colKh0=; b=idv+iY7w4+VI4Jm0s50m3YGP4WHxCYsZUDRAc1ypieM1EZxV3Q9LWLWDUZR+8haoMM NM7A9dYxgSymxygnyPohjf/Ry2Rq/ITlzE5e0920g4987C3wW/idJdvzuHYenEYqA01r Taih+kVmZ5ufwTTtBUu+b2+1nKZ/uCKSEmJwu+mYpWAs6cHDv17jZ9zwi07Kt177J32+ U7MQA9ijoHHx0xI9skDWHkHRjDYJTBVbaCRnIyvMyOPn8Pbs6xMRJB0UY34PLo0MXNWq EsvkShoPvytl+6DRP3elD2q0HtkZ0XjZv3KtIjW7NAR4+5pReI4G5YNRfpwHvgk8Y6fa /p9g== X-Gm-Message-State: ALQs6tDDD3VwM+YL7mZtsl7Mam4HktjATHd2C1bsFnuxdS6SaD4JYb/3 U0n+kZ6ACEtPodSnaq81MAPoX9kx0NgXgA4LUDzUrQ== X-Google-Smtp-Source: AIpwx4/TffdGTG+Mf2spyjAhJqiZ5HarIYpW+EuTpBZrYfY9p2hXrSbH22B6by2MHpKxEhaZMVSPxijzJ21FVow5fzg= X-Received: by 10.28.195.67 with SMTP id t64mr695550wmf.113.1522668917182; Mon, 02 Apr 2018 04:35:17 -0700 (PDT) MIME-Version: 1.0 Sender: rraszuk@gmail.com Received: by 10.28.222.197 with HTTP; Mon, 2 Apr 2018 04:35:16 -0700 (PDT) In-Reply-To: <1522554645079.8864@bell.ca> References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <1522554645079.8864@bell.ca> From: Robert Raszuk Date: Mon, 2 Apr 2018 13:35:16 +0200 X-Google-Sender-Auth: -Zilh-14-XbcIJsQcTBbk0iwsYs Message-ID: To: "Bernier, Daniel" Cc: "mpls@ietf.org" , "sfc@ietf.org" Content-Type: multipart/alternative; boundary="001a114a1082eb54460568dbfbff" Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Apr 2018 11:35:20 -0000 --001a114a1082eb54460568dbfbff Content-Type: text/plain; charset="UTF-8" Daniel, I actually don't think that removal of SR references is a good thing here. The draft still uses source based label stacking as well as global (domain wide) meaning of a label. So even without calling it SR it is still based on SR architecture. Best, R On Sun, Apr 1, 2018 at 5:50 AM, Bernier, Daniel wrote: > +1, > > As explained on the list, with the SR reference removed from > draft-barrel-mpls-sfc, I have no opposition for it to progress that is IF > the WG actually believes it needs to. I did question it's need as an label > based implementation of RFC7665 while we already > draft-bess-service-chaining to do chain services on existing MPLS platforms. > > Cheers, > > Daniel Bernier > --001a114a1082eb54460568dbfbff Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Daniel,

I actually don't think that removal of SR referen= ces is a good thing here. The draft still uses source based label stacking = as well as global (domain wide) meaning of a label. So even without calling= it SR it is still based on SR architecture.=C2=A0
=
Best,
R

On Sun, Ap= r 1, 2018 at 5:50 AM, Bernier, Daniel <daniel.bernier@bell.ca>= wrote:

+1,=C2=A0

As explained=C2=A0on the list, with the S= R reference removed from draft-barrel-mpls-sfc, I have no opposition for it= to progress that is IF the WG actually believes it needs to. I did=C2=A0qu= estion it's need as an label based implementation of RFC7665 while we a= lready draft-bess-service-chaining to do chain services on existing MPLS platform= s.

Cheers,

Daniel Bernier


--001a114a1082eb54460568dbfbff-- From nobody Mon Apr 2 07:42:12 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 63A3912895E; Mon, 2 Apr 2018 07:42:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.91 X-Spam-Level: X-Spam-Status: No, score=-1.91 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, T_RP_MATCHES_RCVD=-0.01] 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 JZ0XPB9tkgna; Mon, 2 Apr 2018 07:42:07 -0700 (PDT) Received: from pipi.pi.nu (pipi.pi.nu [83.168.239.141]) (using TLSv1.1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C6563129515; Mon, 2 Apr 2018 07:42:06 -0700 (PDT) Received: from [192.168.0.101] (c213-89-112-155.bredband.comhem.se [213.89.112.155]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id 1135518013B2; Mon, 2 Apr 2018 16:42:05 +0200 (CEST) From: Loa Andersson To: "Henderickx, Wim (Nokia - BE/Antwerp)" , "mpls@ietf.org" Cc: "BRUNGARD, DEBORAH A" , Robert Raszuk , "sfc@ietf.org" , draft-farrel-mpls-sfc , "mpls-chairs@ietf.org" References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <2c59588b-51d3-a298-a30b-507082da9261@pi.nu> Message-ID: Date: Mon, 2 Apr 2018 16:42:03 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <2c59588b-51d3-a298-a30b-507082da9261@pi.nu> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Apr 2018 14:42:11 -0000 Working Group, I sent this mail some time ago, however I can't see that it actually reached it destinations. /Loa > Working Group, Wim, et.al., > > We had very good support to adopt already version-04. > > However, after a mail from the author, saying they wanted to make > come changes in the document, we allowed for publication of > version-05. > > This version were adopted as a working group document. > > Please note the the wg chairs has to do the consensus call when > e.g. adopting a document as working group document. We found > that we had a "rough consensus" to adopt the document. > > This decision was taken by the wg chairs, which is fully within > the IETF process. > > That decision is taken, the issues that has been pointed out are > noted. These issues need to be resolved on the mailing list and > rough consensus need to be reached for text changes in the document. > > Actually the members of the working group have much more influence on > a working group document, than on an individual draft. > > It would be far better if we now focused on proposing text changes, > rather than discussing processes. > > /Loa > mpls wg co-chair > > On 2018-03-30 20:59, Henderickx, Wim (Nokia - BE/Antwerp) wrote: >> Deborah, >> >> There seems to be a flaw in the process here. There were major >> objections to the draft against WG adoption. A new draft was spun, so >> I would expect a new WG adoption call to happen and get the WG >> feedback + decide afterwards if the draft gets adopted or not. The >> last part is completely missing. Without such procedure whats the >> point of having a WG. >> >> So, it would at least be fair per IETF principles to do another WG >> adoption call and see what happens. >> >> Cheers, >> >> Wim >> >> *From: *"BRUNGARD, DEBORAH A" >> *Date: *Thursday, 29 March 2018 at 22:03 >> *To: *Robert Raszuk >> *Cc: *"Henderickx, Wim (Nokia - BE/Antwerp)" >> , "mpls@ietf.org" , "徐小虎 >> (义先)" , "sfc@ietf.org" , >> draft-farrel-mpls-sfc , >> "mpls-chairs@ietf.org" , mpls >> >> *Subject: *RE: [sfc] [mpls] Working Group adoption of >> draft-farrel-mpls-sfc >> >> Hi Robert, >> >> Looking at the email threads, there was good support for this draft on >> the list (look at earlier responses) recognizing it as a needed >> approach when the NSH was not supported. The authors have added >> sentences to further clarify this does not replace the benefits of >> NSH, it is not “fully redundant”. Everyone will have different >> approaches for migration depending on their networks and probably >> large operators will need to support multiple approaches in various >> parts of their network. Just as different approaches for technology >> and control are used. As you say, NSH can not be introduced overnight. >> But SFCs are being used now, and we need to help the industry >> understand potential migration approaches and tradeoffs. >> >> This is now a working group document. If you have an alternative MPLS >> approach, propose it. Often working group documents get respun several >> times. >> >> Thanks, >> >> Deborah >> >> *From:* rraszuk@gmail.com [mailto:rraszuk@gmail.com] *On Behalf Of >> *Robert Raszuk >> *Sent:* Thursday, March 29, 2018 3:12 PM >> *To:* BRUNGARD, DEBORAH A >> *Cc:* Henderickx, Wim (Nokia - BE/Antwerp) ; >> mpls@ietf.org; 徐小虎(义先) ; >> sfc@ietf.org; draft-farrel-mpls-sfc ; >> mpls-chairs@ietf.org; mpls >> *Subject:* Re: [sfc] [mpls] Working Group adoption of >> draft-farrel-mpls-sfc >> >> Dear Deborah, >> >> Let me perhaps clarify that our comments were not focused on which WG >> this draft should progress in, but if it should progress at all. >> >> Forwarding plane is not something companies can spin overnight and >> number of us do believe that IETF has already made a call as to >> encoding choice of SFC being NSH header. Introducing  MPLS labels to >> partially mimic it will likely not help, but disturb the NSH >> deployments. It will also introduce development conflicts due to both >> hardware and human resource constrains. >> >> Moreover as it was also pointed out during the discussion and to which >> no one responded MPLS in the data plane has been successfully >> developed and deployed in SFC application with the help of >> draft-ietf-bess-service-chaining. Control plane is much easier to >> extend then to define yet one more data plane. >> >> So what are the real technical reasons to introduce fully redundant >> data plane encoding for SFC ? And that is regardless in which WG that >> would happen. >> >> Kind regards, >> >> Robert. >> >> On Thu, Mar 29, 2018 at 8:57 PM, BRUNGARD, DEBORAH A >> > wrote: >> >>     Hi, >> >>     Both myself (AD for MPLS) and Martin (AD for SFC and SPRING) were >>     consulted on this draft and we agreed for it to progress in MPLS. >> >>     WG adoption allows the document to be a document of the working >>     group vs. the authors. If you have input for the document, provide >>     it on the MPLS list. The document will be coordinated at key >>     transitions with SFC. This is not the first time that documents >>     early in their timelines may seem to overlap in the different >>     groups, and need the authors to collaborate to sort out/merge, as >>     these documents are ultimately products of IETF, and not the >>     individual authors. >> >>     I noted below it is said that this new version does not eliminate >>     the conflict with the other draft’s approach. It is best to say >>     specifically which text is in conflict and do a proposal to align. >> >>     Thanks, >> >>     Deborah >> >>     *From:* sfc >>     [mailto:sfc-bounces@ietf.org] *On >>     Behalf Of *Robert Raszuk >>     *Sent:* Thursday, March 29, 2018 8:06 AM >>     *To:* Henderickx, Wim (Nokia - BE/Antwerp) >>     > >>     *Cc:* mpls@ietf.org; 徐小虎(义先) >>     >; >>     sfc@ietf.org; draft-farrel-mpls-sfc >> >> >; >>     mpls-chairs@ietf.org; mpls >>     > >>     *Subject:* Re: [sfc] [mpls] Working Group adoption of >>     draft-farrel-mpls-sfc >> >>     Hey Wim, >> >>     It is very obvious on what basis this adoption happened .... >> >>     If ADs do not take any serious action here it will progress smooth & >>     direct to RFC. >> >>     I am only a bit puzzled why the WG last call has not started yet on >>     this :/. >> >>     Best, >> >>     R. >> >>     On Wed, Mar 28, 2018 at 10:25 AM, Henderickx, Wim (Nokia - >>     BE/Antwerp) >>     > wrote: >> >>         Similar comment here on what basis do we adopt this. There were >>         serious issues and although a new draft was posted they have not >>         been addressed. On what basis do you adopt this? I thought IETF >>         works on basis of consensus and in my view this was not achieved >>         so far. >> >>          From iPhone >> >> >> ------------------------------------------------------------------------ >> >>         *From:*mpls >>         > on behalf >>         of 徐小虎(义先) >>         > >>         *Sent:* Wednesday, March 28, 2018 10:17:04 AM >>         *To:* mpls; mpls@ietf.org >>         *Cc:* draft-farrel-mpls-sfc; >>         mpls-chairs@ietf.org; >>         sfc@ietf.org >>         *Subject:* Re: [mpls] Working Group adoption of >>         draft-farrel-mpls-sfc >> >>         Hi Loa, >> >>         I don't believe the modification in Section 6 of >>         draft-farrel-mpls-sfc >> >> (https://tools.ietf.org/rfcdiff?url2=draft-farrel-mpls-sfc-05.txt) >> >>         has eliminated the serious conflict with the SR-MPLS-based SFC >>         approach as described in >> >> https://tools.ietf.org/html/draft-xu-mpls-service-chaining-03 (note >> >>         that this draft has been merged into >> >> https://tools.ietf.org/html/draft-xu-clad-spring-sr-service-chaining-00), >> >>         as had been pointed by many people before. >> >>         Therefore, it seems a little bit unreasonable to hurry the >>         adoption of the current version, IMHO. >> >>         Xiaohu >> >> >> ------------------------------------------------------------------ >> >>             Loa Andersson > >> >>             2018年3月28日(星期三) 15:56 >> >> >> mpls@ietf.org> >> >>             draft-farrel-mpls-sfc >> >> >; >> >> sfc@ietf.org>; >> >> mpls-chairs@ietf.org> >> >> >>             [mpls] Working Group adoption of draft-farrel-mpls-sfc >> >>             Working Group, >> >> >> The MPLS working group have decided to adopt draft-farrel-mpls-sfc-05 as >>             an MPLS working group document. >> >> >> Can the authors please post draft-ietf-mpls-sfc-00, without any other >>             than administrative (filename, version and dates) changes. >> >>             /Loa >>             for the MPLS wg chairs >> >>             -- >> >>             Loa Andersson                        email: >>             loa@pi.nu >>             Senior MPLS Expert >>             Bronze Dragon Consulting             phone: +46 739 81 21 64 >> >>             _______________________________________________ >>             mpls mailing list >>             mpls@ietf.org >> >> https://www.ietf.org/mailman/listinfo/mpls >> >> >> >>         _______________________________________________ >>         mpls mailing list >>         mpls@ietf.org >> >> https://www.ietf.org/mailman/listinfo/mpls >> >> >> >> >> _______________________________________________ >> mpls mailing list >> mpls@ietf.org >> https://www.ietf.org/mailman/listinfo/mpls >> > -- Loa Andersson email: loa@pi.nu Senior MPLS Expert Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Mon Apr 2 08:23:13 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D45691272E1; Mon, 2 Apr 2018 02:24:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.221 X-Spam-Level: X-Spam-Status: No, score=-2.221 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=1.989, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] 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 9CpM5LUsg4fZ; Mon, 2 Apr 2018 02:24:02 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [194.213.3.17]) (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 39513127286; Mon, 2 Apr 2018 02:24:02 -0700 (PDT) Received: from lhreml706-cah.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id C412439B55983; Mon, 2 Apr 2018 10:23:58 +0100 (IST) Received: from DGGEMM402-HUB.china.huawei.com (10.3.20.210) by lhreml706-cah.china.huawei.com (10.201.108.47) with Microsoft SMTP Server (TLS) id 14.3.382.0; Mon, 2 Apr 2018 10:23:59 +0100 Received: from DGGEMM512-MBX.china.huawei.com ([169.254.3.61]) by DGGEMM402-HUB.china.huawei.com ([10.3.20.210]) with mapi id 14.03.0361.001; Mon, 2 Apr 2018 17:23:54 +0800 From: Lizhenbin To: "Zafar Ali (zali)" , "Henderickx, Wim (Nokia - BE/Antwerp)" , "BRUNGARD, DEBORAH A" , Robert Raszuk CC: "mpls@ietf.org" , =?utf-8?B?5b6Q5bCP6JmOKOS5ieWFiCk=?= , "sfc@ietf.org" , draft-farrel-mpls-sfc , "mpls-chairs@ietf.org" , mpls Thread-Topic: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc Thread-Index: AQHTxm5rcSOV9adHvUK7kz2kPxqT16PmmZUAgABzIoCAAAPugIAADl2AgAGAeICAABwtAIAEfeJw Date: Mon, 2 Apr 2018 09:23:53 +0000 Message-ID: <5A5B4DE12C0DAC44AF501CD9A2B01A8D8F3E8B37@dggemm512-mbx.china.huawei.com> References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <8F817341-BEDD-47F3-82E7-9EF1EF728735@cisco.com> In-Reply-To: <8F817341-BEDD-47F3-82E7-9EF1EF728735@cisco.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.111.206.84] Content-Type: multipart/related; boundary="_004_5A5B4DE12C0DAC44AF501CD9A2B01A8D8F3E8B37dggemm512mbxchi_"; type="multipart/alternative" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: X-Mailman-Approved-At: Mon, 02 Apr 2018 08:23:12 -0700 Subject: [sfc] =?utf-8?b?562U5aSNOiAgW21wbHNdIFdvcmtpbmcgR3JvdXAgYWRvcHRp?= =?utf-8?q?on_of_draft-farrel-mpls-sfc?= X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Apr 2018 09:24:07 -0000 --_004_5A5B4DE12C0DAC44AF501CD9A2B01A8D8F3E8B37dggemm512mbxchi_ Content-Type: multipart/alternative; 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--_004_5A5B4DE12C0DAC44AF501CD9A2B01A8D8F3E8B37dggemm512mbxchi_-- From nobody Tue Apr 3 18:46:01 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0328D126B6D; Tue, 3 Apr 2018 18:45:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.017 X-Spam-Level: X-Spam-Status: No, score=-1.017 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_FONT_FACE_BAD=0.981, HTML_MESSAGE=0.001, MIME_QP_LONG_LINE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=alibaba-inc.com 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 HsbmSovweqgM; Tue, 3 Apr 2018 18:45:53 -0700 (PDT) Received: from out0-155.mail.aliyun.com (out0-155.mail.aliyun.com [140.205.0.155]) (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 AC7C412426E; Tue, 3 Apr 2018 18:45:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alibaba-inc.com; s=default; t=1522806349; h=Date:Subject:From:To:Message-ID:Mime-version:Content-type; bh=Ub8Nrv4vKQckBg1g2XxzdTf63CHavfrDrjSy0I9cmv8=; b=ObCEZvqIO9npGRr/UOd7uSUmftIO3Zs0i8LyYSCODo94PYJrlZOp+dvKRu9+GIGhc2Yxkl9BJ3pcIYCWIPcOMU543vXrX7BcWgdkottRYIEkv5wzyuk8BHj9UuGebgnmxQG3WqAQDfrD3SVd9IoOAkgTz7D6Gwp7asS04MTPuQM= X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R191e4; CH=green; FP=0|-1|-1|-1|0|-1|-1|-1; HT=e01l07447; MF=xiaohu.xxh@alibaba-inc.com; NM=1; PH=DS; RN=2; SR=0; TI=SMTPD_---.BYv2NPp_1522806341; Received: from 30.6.88.37(mailfrom:xiaohu.xxh@alibaba-inc.com fp:42.120.74.236) by smtp.aliyun-inc.com(127.0.0.1); Wed, 04 Apr 2018 09:45:42 +0800 User-Agent: Microsoft-MacOutlook/14.7.7.170905 Date: Wed, 04 Apr 2018 09:45:38 +0800 From: "=?UTF-8?B?5b6Q5bCP6JmOKOS5ieWFiCk=?=" To: SPRING WG List CC: "sfc@ietf.org" Message-ID: Thread-Topic: Request WG adoption for draft-xuclad-spring-sr-service-chaining-01 Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3605679940_5278345" Archived-At: Subject: [sfc] Request WG adoption for draft-xuclad-spring-sr-service-chaining-01 X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Apr 2018 01:45:55 -0000 > ʼʹ MIME ʽʼĶʶ ˸ʽˣ޷ʶʼķֲ򲿷ݡ --B_3605679940_5278345 Content-type: text/plain; charset="GB2312" Content-transfer-encoding: 7bit Hi SPRING WG co-chairs, We authors believe this draft (https://tools.ietf.org/html/draft-xuclad-spring-sr-service-chaining-01) has been stable enough and therefore we would like to request a WG adoption call for it. We believe this work belongs to SPRING WG since the concept of service segment has been mentioned in the Segment Routing architecture from day one and the approaches as described in this draft are exactly to leverage the stateless source routing capability of segment routing to achieve a stateless SFC. To some extent, SFC can be looked as a special case of source routing as it requires the selected traffic to traverse an ordered list of service nodes. We believe the SFC WG review is still needed after the adoption since we still hope to reuse the NSH for some special purposes (e.g., use it as a metadata container). BTW, implementations based on this draft have existed, as noted in section 8 of the draft. Best regards, Xiaohu (on behalf of coauthors) --B_3605679940_5278345 Content-type: text/html; charset="GB2312" Content-transfer-encoding: quoted-printable

Hi SPRING WG co-chairs,

We= authors believe this draft (http= s://tools.ietf.org/html/draft-xuclad-spring-sr-service-chaining-01) has = been stable enough and therefore we would like to request a WG adoption call for it.

We believe this work belongs to SPRING WG since the concept of service se= gment has been mentioned in the Segment Routing architecture from day one an= d the approaches as described in this draft are exactly to leverage the stat= eless source routing capability of segment routing to achieve a stateless SF= C. To some extent, SFC can be looked as a special case of source routing as = it requires the selected traffic to traverse an ordered list of service node= s.

<= br>
We= believe the SFC WG review is still needed after the adoption since we still= hope to reuse the NSH for some special purposes (e.g., use it as a metadata= container). 
<= br>
BTW, implementations based on this draft have existed, a= s noted in section 8 of the draft.

Best regards,<= /span>
Xiaohu (on behalf of coauth= ors)




<= /div>

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banners=-,-,- X-VirusChecked: Checked Received: (qmail 18930 invoked from network); 4 Apr 2018 03:25:53 -0000 Received: from tls.exchange.bell.ca (HELO Tls.exchange.bell.ca) (67.69.230.133) by server-10.tower-224.messagelabs.com with DHE-RSA-AES256-GCM-SHA384 encrypted SMTP; 4 Apr 2018 03:25:53 -0000 X-CrossPremisesHeadersFilteredBySendConnector: EX13EDGE02-WYN.bell.corp.bce.ca Received: from DG1MBX04-WYN.bell.corp.bce.ca (198.235.102.33) by EX13EDGE02-WYN.bell.corp.bce.ca (198.235.68.44) with Microsoft SMTP Server id 15.0.1263.5; Tue, 3 Apr 2018 23:25:47 -0400 Received: from DG1MBX04-WYN.bell.corp.bce.ca (2002:8eb6:120e::8eb6:120e) by DG1MBX04-WYN.bell.corp.bce.ca (2002:8eb6:120e::8eb6:120e) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Tue, 3 Apr 2018 23:25:52 -0400 Received: from DG1MBX04-WYN.bell.corp.bce.ca ([fe80::15cb:7efd:e348:57f4]) by DG1MBX04-WYN.bell.corp.bce.ca ([fe80::15cb:7efd:e348:57f4%22]) with mapi id 15.00.1347.000; Tue, 3 Apr 2018 23:25:52 -0400 From: "Bernier, Daniel" To: Robert Raszuk CC: "mpls@ietf.org" , "sfc@ietf.org" Thread-Topic: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc Thread-Index: AQHTx1ZOSRsC8e52o0Oa8xO4MYZ6y6Pn1BKAgAAD7oCAAA5dgIABgHeAgAHdPXWAAl2nAIABWLMo Date: Wed, 4 Apr 2018 03:25:52 +0000 Message-ID: <1522812352107.5966@bell.ca> References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <1522554645079.8864@bell.ca>, In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [172.24.25.6] Content-Type: multipart/alternative; boundary="_000_15228123521075966bellca_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Received-SPF: SoftFail (EX13EDGE02-WYN.bell.corp.bce.ca: domain of transitioning daniel.bernier@bell.ca discourages use of 198.235.102.33 as permitted sender) X-OrganizationHeadersPreserved: EX13EDGE02-WYN.bell.corp.bce.ca Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Apr 2018 03:25:59 -0000 --_000_15228123521075966bellca_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, Robert, from what I gather, these labels (although it may be perceived as s= uch) are there to represent in label stack format the SPI/SI of NSH providi= ng path awareness at each hop in the network, not used in the forwarding pa= th. The reference to SR seems only to be on wether one should use pop/swap = or SR for transport ... not much added value in the draft except to affirm = that it could run over an SR-MPLS implementation. I agree that it is plays strangely close to SR architecture by the use of g= lobal labels for unique IDs. I am cautious about it though because it would= mean that anyone that comes up with an idea of using globally assigned lab= els for a specific use case might be forbidden. What I am really challenging is the necessity for this draft knowing that: a) we have a working implementation of VPN based chaining with draft-bess-s= ervice-chaining where path info resides in BGP control-plane. b) we have RFC8300 for service overlay where path info resides in the NSH h= eader and is carried along the path.? c) we have draft-xuclad-sr-service-chaining using segment-routing where pat= h info is known at the edges and potentially computed at a controller. Cheers, Dan B ________________________________ From: rraszuk@gmail.com on behalf of Robert Raszuk Sent: Monday, April 2, 2018 7:35 AM To: Bernier, Daniel Cc: mpls@ietf.org; sfc@ietf.org Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc Daniel, I actually don't think that removal of SR references is a good thing here. = The draft still uses source based label stacking as well as global (domain = wide) meaning of a label. So even without calling it SR it is still based o= n SR architecture. Best, R On Sun, Apr 1, 2018 at 5:50 AM, Bernier, Daniel > wrote: +1, As explained on the list, with the SR reference removed from draft-barrel-m= pls-sfc, I have no opposition for it to progress that is IF the WG actually= believes it needs to. I did question it's need as an label based implement= ation of RFC7665 while we already draft-bess-service-chaining to do chain s= ervices on existing MPLS platforms. Cheers, Daniel Bernier --_000_15228123521075966bellca_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi,


Robert, from what I gather, these labels (although it may be perceived a= s such) are there to represent in label stack format the SPI/SI of NSH prov= iding path awareness at each hop in the network, not used in the forwarding= path. The reference to SR seems only to be on wether one should use pop/swap or SR for transport ... not m= uch added value in the draft except to affirm that it could run over an SR-= MPLS implementation. 


I agree that it is plays strangely close to SR architecture by the use o= f global labels for unique IDs. I am cautious about it though because it wo= uld mean that anyone that comes up with an idea of using globally assigned = labels for a specific use case might be forbidden.


What I am really challenging is the necessity for this draft knowing tha= t:

a) we have a working implementation = of VPN based chaining with draft= -bess-service-chaining where path info resides in BGP control-plane.=

b) we have RFC8300 for service overl= ay where path info resides in the NSH header and is carried along the path.= ​

c) we have draft-xuclad-sr-service-c= haining using segment-routing where path info is known at the edges an= d potentially computed at a controller.


Cheers,


Dan B

From: rraszuk@gmail.com <= ;rraszuk@gmail.com> on behalf of Robert Raszuk <robert@raszuk.net>=
Sent: Monday, April 2, 2018 7:35 AM
To: Bernier, Daniel
Cc: mpls@ietf.org; sfc@ietf.org
Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpl= s-sfc
 
Daniel,

I actually don't think that removal of SR references is a good thing here. = The draft still uses source based label stacking as well as global (domain = wide) meaning of a label. So even without calling it SR it is still based o= n SR architecture. 

Best,
R


On Sun, Apr 1, 2018 at 5:50 AM, Bernier, Daniel = <daniel.bern= ier@bell.ca> wrote:

+1, 

As explained on the list, with the S= R reference removed from draft-barrel-mpls-sfc, I have no opposition for it= to progress that is IF the WG actually believes it needs to. I did qu= estion it's need as an label based implementation of RFC7665 while we already draft-bess-service-chaining to do chain servic= es on existing MPLS platforms.

Cheers,

Daniel Bernier


--_000_15228123521075966bellca_-- From nobody Fri Apr 6 09:01:15 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9F9EB1204DA; Fri, 6 Apr 2018 09:01:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.211 X-Spam-Level: X-Spam-Status: No, score=-4.211 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] 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 eiqmbhJoKRHO; Fri, 6 Apr 2018 09:01:01 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [194.213.3.17]) (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 03A05120724; Fri, 6 Apr 2018 09:01:01 -0700 (PDT) Received: from lhreml704-cah.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id F419F1DB5A938; Fri, 6 Apr 2018 17:00:56 +0100 (IST) Received: from SJCEML702-CHM.china.huawei.com (10.208.112.38) by lhreml704-cah.china.huawei.com (10.201.108.45) with Microsoft SMTP Server (TLS) id 14.3.382.0; Fri, 6 Apr 2018 17:00:58 +0100 Received: from SJCEML521-MBS.china.huawei.com ([169.254.2.168]) by SJCEML702-CHM.china.huawei.com ([169.254.4.179]) with mapi id 14.03.0382.000; Fri, 6 Apr 2018 09:00:56 -0700 From: James N Guichard To: 'SPRING WG List' , "sfc@ietf.org" Thread-Topic: I-D Action: draft-guichard-sfc-nsh-sr-01.txt Thread-Index: AQHTzb2nByW4bpDMJkWMGDkBHS04aqPz4zTA Date: Fri, 6 Apr 2018 16:00:55 +0000 Message-ID: References: <152302920760.3826.7185513920159046150@ietfa.amsl.com> In-Reply-To: <152302920760.3826.7185513920159046150@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.157.109] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [sfc] FW: I-D Action: draft-guichard-sfc-nsh-sr-01.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Apr 2018 16:01:08 -0000 Dear WGs: This document is relevant for both the SFC and SPRING WGs; the authors very= much welcome comments/suggestions from the community. Thanks! -----Original Message----- From: I-D-Announce [mailto:i-d-announce-bounces@ietf.org] On Behalf Of inte= rnet-drafts@ietf.org Sent: Friday, April 06, 2018 11:40 AM To: i-d-announce@ietf.org Subject: I-D Action: draft-guichard-sfc-nsh-sr-01.txt A New Internet-Draft is available from the on-line Internet-Drafts director= ies. Title : NSH and Segment Routing Integration for Service F= unction Chaining (SFC) Authors : James N Guichard Haoyu Song Jeff Tantsura Joel Halpern Wim Henderickx Mohamed Boucadair Filename : draft-guichard-sfc-nsh-sr-01.txt Pages : 15 Date : 2018-04-06 Abstract: This document describes two application scenarios where Network Service Header (NSH) and Segment Routing (SR) techniques can be deployed together to support Service Function Chaining (SFC) in an efficient manner while maintaining separation of the service and transport planes as originally intended by the SFC architecture. In the first scenario, an NSH-based SFC is created using SR as the transport between SFFs. SR in this case is just one of many encapsulations that could be used to maintain the transport- independent nature of NSH-based service chains. In the second scenario, SR is used to represent each service hop of the NSH-based SFC as a segment within the segment-list. SR and NSH in this case are integrated. In both scenarios SR is responsible for steering packets between SFFs of a given SFP while NSH is responsible for maintaining the integrity of the service plane, the SFC instance context, and any associated metadata. These application scenarios demonstrate that NSH and SR can work jointly and complement each other leaving the network operator with the flexibility to use whichever transport technology makes sense in specific areas of their network infrastructure, and still maintain an end-to-end service plane using NSH. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-guichard-sfc-nsh-sr/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-guichard-sfc-nsh-sr-01 https://datatracker.ietf.org/doc/html/draft-guichard-sfc-nsh-sr-01 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=3Ddraft-guichard-sfc-nsh-sr-01 Please note that it may take a couple of minutes from the time of submissio= n until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ _______________________________________________ I-D-Announce mailing list I-D-Announce@ietf.org https://www.ietf.org/mailman/listinfo/i-d-announce Internet-Draft directories: http://www.ietf.org/shadow.html or ftp://ftp.ie= tf.org/ietf/1shadow-sites.txt From nobody Sat Apr 7 23:03:26 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3DBF5126FB3; Sat, 7 Apr 2018 23:03:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=nokia.onmicrosoft.com 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"=?UTF-8?B?5b6Q5bCP6JmOKOS5ieWFiCk=?=" Message-ID: <1cd0d29d-7261-4940-9d09-5bc3e1347bce.xiaohu.xxh@alibaba-inc.com> X-Mailer: [Alimail-Mailagent revision 948139][W4_5223772][v5ForWebDing][Chrome] MIME-Version: 1.0 References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <2c59588b-51d3-a298-a30b-507082da9261@pi.nu> , <33B45D97-52EF-4DE9-A5A1-1A823961F351@nokia.com> In-Reply-To: <33B45D97-52EF-4DE9-A5A1-1A823961F351@nokia.com> x-aliyun-mail-creator: W4_5223772_v5ForWebDing_M3LTW96aWxsYS81LjAgKE1hY2ludG9zaDsgSW50ZWwgTWFjIE9TIFggMTBfMTJfNikgQXBwbGVXZWJLaXQvNTM3LjM2IChLSFRNTCwgbGlrZSBHZWNrbykgQ2hyb21lLzY1LjAuMzMyNS4xODEgU2FmYXJpLzUzNy4zNg==vN Content-Type: multipart/alternative; boundary="----=ALIBOUNDARY_55562_47577940_5ac9c15b_5911c3" Archived-At: Subject: Re: [sfc] =?utf-8?q?=5Bmpls=5D_Working_Group_adoption_of_draft-farre?= =?utf-8?q?l-mpls-sfc?= X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 08 Apr 2018 07:16:23 -0000 ------=ALIBOUNDARY_55562_47577940_5ac9c15b_5911c3 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: base64 KzEKWGlhb2h1Ci0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tLUhlbmRlcmlja3gsIFdpbSAoTm9raWEgLSBCRS9BbnR3ZXJwKSA8 d2ltLmhlbmRlcmlja3hAbm9raWEuY29tPjIwMTjlubQ05pyIOOaXpSjmmJ/mnJ/ml6UpIDE0OjAz TG9hIEFuZGVyc3NvbiA8bG9hQHBpLm51PjsgbXBsc0BpZXRmLm9yZyA8bXBsc0BpZXRmLm9yZz5k cmFmdC1mYXJyZWwtbXBscy1zZmMgPGRyYWZ0LWZhcnJlbC1tcGxzLXNmY0BpZXRmLm9yZz47IHNm Y0BpZXRmLm9yZyA8c2ZjQGlldGYub3JnPjsgUm9iZXJ0IFJhc3p1ayA8cm9iZXJ0QHJhc3p1ay5u ZXQ+OyBtcGxzLWNoYWlyc0BpZXRmLm9yZyA8bXBscy1jaGFpcnNAaWV0Zi5vcmc+UmU6IFttcGxz XSBXb3JraW5nIEdyb3VwIGFkb3B0aW9uIG9mIGRyYWZ0LWZhcnJlbC1tcGxzLXNmYwpMb2EswqBJ wqBzdGlsbMKgZG9u4oCZdMKgc2VlwqB3aGVyZcKgdGhlwqBjb25zZW5zdXPCoHdhc8KgcmVhY2hl 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(No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id A78191801559; Mon, 9 Apr 2018 09:46:03 +0200 (CEST) To: "Henderickx, Wim (Nokia - BE/Antwerp)" , "mpls@ietf.org" Cc: "BRUNGARD, DEBORAH A" , Robert Raszuk , "sfc@ietf.org" , draft-farrel-mpls-sfc , "mpls-chairs@ietf.org" References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <2c59588b-51d3-a298-a30b-507082da9261@pi.nu> <33B45D97-52EF-4DE9-A5A1-1A823961F351@nokia.com> From: Loa Andersson Message-ID: Date: Mon, 9 Apr 2018 09:46:02 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <33B45D97-52EF-4DE9-A5A1-1A823961F351@nokia.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Apr 2018 07:46:10 -0000 Wim, et.al., There are a number of things that could be discussed in this context. We might view the IETF process slightly different. The IETF allow for "rough consensus". Meaning that there mihgt be some wg members that are "in the rough", i.e. not supporting the decisions taken by the part of the working group forming the "rough consensus" group. Being in the rough is sometimes hard, the best way forward is often to accept the decision and try to constructively contribute to e.g. progressing a document. You say that "none of the issues raised have been addressed", the validity of the statement depends on what you mean by addressed. "Addressed" is normally a language that we use when requesting publication of a document. "Addressed" is more or less synonymous with "solved". In the context of working group adoption poll "addressed" in this meaning is not necessary. "Addressed" in this context should mean "recognized" and that all parties are willing to discuss the issues. There are a few criteria for accepting a document as a working group document - the document is a good enough starting point - enough support (rough consensus) in the working group to adopt the document - there are enough people in the wg that are willing to work on the document - any issues that are recognized in the poll, is deemed to be possible to during the working group process All these three criteria are met. Especially for the third criteria the wg chair believe that it is easier to resolve the issues if the working group holds the revision control and make consensus calls (explicit or implicit) on these issues or other text changes to the document. With this I hope we can can put this process discussion to the side and instead focus on the technical issues. /Loa mpls wg co-chair On 2018-04-08 08:03, Henderickx, Wim (Nokia - BE/Antwerp) wrote: > Loa, I still don’t see where the consensus was reached. I looked back at the tracker and you see same amount of people for as well as against and none of the issues raised have been addressed, based on the feedback you have seen. > So I really question the process here and 2nd you should run another poll on the new draft given the issues were not addressed. > > On 02/04/2018, 16:42, "Loa Andersson" wrote: > > Working Group, > > I sent this mail some time ago, however I can't see that it > actually reached it destinations. > > /Loa > > > > > Working Group, Wim, et.al., > > > > We had very good support to adopt already version-04. > > > > However, after a mail from the author, saying they wanted to make > > come changes in the document, we allowed for publication of > > version-05. > > > > This version were adopted as a working group document. > > > > Please note the the wg chairs has to do the consensus call when > > e.g. adopting a document as working group document. We found > > that we had a "rough consensus" to adopt the document. > > > > This decision was taken by the wg chairs, which is fully within > > the IETF process. > > > > That decision is taken, the issues that has been pointed out are > > noted. These issues need to be resolved on the mailing list and > > rough consensus need to be reached for text changes in the document. > > > > Actually the members of the working group have much more influence on > > a working group document, than on an individual draft. > > > > It would be far better if we now focused on proposing text changes, > > rather than discussing processes. > > > > /Loa > > mpls wg co-chair > > > > On 2018-03-30 20:59, Henderickx, Wim (Nokia - BE/Antwerp) wrote: > >> Deborah, > >> > >> There seems to be a flaw in the process here. There were major > >> objections to the draft against WG adoption. A new draft was spun, so > >> I would expect a new WG adoption call to happen and get the WG > >> feedback + decide afterwards if the draft gets adopted or not. The > >> last part is completely missing. Without such procedure whats the > >> point of having a WG. > >> > >> So, it would at least be fair per IETF principles to do another WG > >> adoption call and see what happens. > >> > >> Cheers, > >> > >> Wim > >> > >> *From: *"BRUNGARD, DEBORAH A" > >> *Date: *Thursday, 29 March 2018 at 22:03 > >> *To: *Robert Raszuk > >> *Cc: *"Henderickx, Wim (Nokia - BE/Antwerp)" > >> , "mpls@ietf.org" , "徐小虎 > >> (义先)" , "sfc@ietf.org" , > >> draft-farrel-mpls-sfc , > >> "mpls-chairs@ietf.org" , mpls > >> > >> *Subject: *RE: [sfc] [mpls] Working Group adoption of > >> draft-farrel-mpls-sfc > >> > >> Hi Robert, > >> > >> Looking at the email threads, there was good support for this draft on > >> the list (look at earlier responses) recognizing it as a needed > >> approach when the NSH was not supported. The authors have added > >> sentences to further clarify this does not replace the benefits of > >> NSH, it is not “fully redundant”. Everyone will have different > >> approaches for migration depending on their networks and probably > >> large operators will need to support multiple approaches in various > >> parts of their network. Just as different approaches for technology > >> and control are used. As you say, NSH can not be introduced overnight. > >> But SFCs are being used now, and we need to help the industry > >> understand potential migration approaches and tradeoffs. > >> > >> This is now a working group document. If you have an alternative MPLS > >> approach, propose it. Often working group documents get respun several > >> times. > >> > >> Thanks, > >> > >> Deborah > >> > >> *From:* rraszuk@gmail.com [mailto:rraszuk@gmail.com] *On Behalf Of > >> *Robert Raszuk > >> *Sent:* Thursday, March 29, 2018 3:12 PM > >> *To:* BRUNGARD, DEBORAH A > >> *Cc:* Henderickx, Wim (Nokia - BE/Antwerp) ; > >> mpls@ietf.org; 徐小虎(义先) ; > >> sfc@ietf.org; draft-farrel-mpls-sfc ; > >> mpls-chairs@ietf.org; mpls > >> *Subject:* Re: [sfc] [mpls] Working Group adoption of > >> draft-farrel-mpls-sfc > >> > >> Dear Deborah, > >> > >> Let me perhaps clarify that our comments were not focused on which WG > >> this draft should progress in, but if it should progress at all. > >> > >> Forwarding plane is not something companies can spin overnight and > >> number of us do believe that IETF has already made a call as to > >> encoding choice of SFC being NSH header. Introducing MPLS labels to > >> partially mimic it will likely not help, but disturb the NSH > >> deployments. It will also introduce development conflicts due to both > >> hardware and human resource constrains. > >> > >> Moreover as it was also pointed out during the discussion and to which > >> no one responded MPLS in the data plane has been successfully > >> developed and deployed in SFC application with the help of > >> draft-ietf-bess-service-chaining. Control plane is much easier to > >> extend then to define yet one more data plane. > >> > >> So what are the real technical reasons to introduce fully redundant > >> data plane encoding for SFC ? And that is regardless in which WG that > >> would happen. > >> > >> Kind regards, > >> > >> Robert. > >> > >> On Thu, Mar 29, 2018 at 8:57 PM, BRUNGARD, DEBORAH A > >> > wrote: > >> > >> Hi, > >> > >> Both myself (AD for MPLS) and Martin (AD for SFC and SPRING) were > >> consulted on this draft and we agreed for it to progress in MPLS. > >> > >> WG adoption allows the document to be a document of the working > >> group vs. the authors. If you have input for the document, provide > >> it on the MPLS list. The document will be coordinated at key > >> transitions with SFC. This is not the first time that documents > >> early in their timelines may seem to overlap in the different > >> groups, and need the authors to collaborate to sort out/merge, as > >> these documents are ultimately products of IETF, and not the > >> individual authors. > >> > >> I noted below it is said that this new version does not eliminate > >> the conflict with the other draft’s approach. It is best to say > >> specifically which text is in conflict and do a proposal to align. > >> > >> Thanks, > >> > >> Deborah > >> > >> *From:* sfc > >> [mailto:sfc-bounces@ietf.org] *On > >> Behalf Of *Robert Raszuk > >> *Sent:* Thursday, March 29, 2018 8:06 AM > >> *To:* Henderickx, Wim (Nokia - BE/Antwerp) > >> > > >> *Cc:* mpls@ietf.org; 徐小虎(义先) > >> >; > >> sfc@ietf.org; draft-farrel-mpls-sfc > >> > >> >; > >> mpls-chairs@ietf.org; mpls > >> > > >> *Subject:* Re: [sfc] [mpls] Working Group adoption of > >> draft-farrel-mpls-sfc > >> > >> Hey Wim, > >> > >> It is very obvious on what basis this adoption happened .... > >> > >> If ADs do not take any serious action here it will progress smooth & > >> direct to RFC. > >> > >> I am only a bit puzzled why the WG last call has not started yet on > >> this :/. > >> > >> Best, > >> > >> R. > >> > >> On Wed, Mar 28, 2018 at 10:25 AM, Henderickx, Wim (Nokia - > >> BE/Antwerp) > >> > wrote: > >> > >> Similar comment here on what basis do we adopt this. There were > >> serious issues and although a new draft was posted they have not > >> been addressed. On what basis do you adopt this? I thought IETF > >> works on basis of consensus and in my view this was not achieved > >> so far. > >> > >> From iPhone > >> > >> > >> ------------------------------------------------------------------------ > >> > >> *From:*mpls > >> > on behalf > >> of 徐小虎(义先) > >> > > >> *Sent:* Wednesday, March 28, 2018 10:17:04 AM > >> *To:* mpls; mpls@ietf.org > >> *Cc:* draft-farrel-mpls-sfc; > >> mpls-chairs@ietf.org; > >> sfc@ietf.org > >> *Subject:* Re: [mpls] Working Group adoption of > >> draft-farrel-mpls-sfc > >> > >> Hi Loa, > >> > >> I don't believe the modification in Section 6 of > >> draft-farrel-mpls-sfc > >> > >> (https://tools.ietf.org/rfcdiff?url2=draft-farrel-mpls-sfc-05.txt) > >> > >> has eliminated the serious conflict with the SR-MPLS-based SFC > >> approach as described in > >> > >> https://tools.ietf.org/html/draft-xu-mpls-service-chaining-03 (note > >> > >> that this draft has been merged into > >> > >> https://tools.ietf.org/html/draft-xu-clad-spring-sr-service-chaining-00), > >> > >> as had been pointed by many people before. > >> > >> Therefore, it seems a little bit unreasonable to hurry the > >> adoption of the current version, IMHO. > >> > >> Xiaohu > >> > >> > >> ------------------------------------------------------------------ > >> > >> Loa Andersson > > >> > >> 2018年3月28日(星期三) 15:56 > >> > >> > >> mpls@ietf.org> > >> > >> draft-farrel-mpls-sfc > >> > >> >; > >> > >> sfc@ietf.org>; > >> > >> mpls-chairs@ietf.org> > >> > >> > >> [mpls] Working Group adoption of draft-farrel-mpls-sfc > >> > >> Working Group, > >> > >> > >> The MPLS working group have decided to adopt draft-farrel-mpls-sfc-05 as > >> an MPLS working group document. > >> > >> > >> Can the authors please post draft-ietf-mpls-sfc-00, without any other > >> than administrative (filename, version and dates) changes. > >> > >> /Loa > >> for the MPLS wg chairs > >> > >> -- > >> > >> Loa Andersson email: > >> loa@pi.nu > >> Senior MPLS Expert > >> Bronze Dragon Consulting phone: +46 739 81 21 64 > >> > >> _______________________________________________ > >> mpls mailing list > >> mpls@ietf.org > >> > >> https://www.ietf.org/mailman/listinfo/mpls > >> > >> > >> > >> _______________________________________________ > >> mpls mailing list > >> mpls@ietf.org > >> > >> https://www.ietf.org/mailman/listinfo/mpls > >> > >> > >> > >> > >> _______________________________________________ > >> mpls mailing list > >> mpls@ietf.org > >> https://www.ietf.org/mailman/listinfo/mpls > >> > > > > -- > > > Loa Andersson email: loa@pi.nu > Senior MPLS Expert > Bronze Dragon Consulting phone: +46 739 81 21 64 > > -- Loa Andersson email: loa@pi.nu Senior MPLS Expert Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Mon Apr 9 02:44:30 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 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Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Apr 2018 09:55:00 -0000 SSBhZ3JlZSB3aXRoIFdpbS4gV2UgaGF2ZSBoYWQgYSBzaW1pbGFyIHNpdHVhdGlvbiB3aXRoIGEg QklFUiBkcmFmdCBXRyBhZG9wdGlvbiBhbmQgdGhlIG91dGNvbWUgaXMgc2ltcGxlOiB3b3JrIHRv IHJlc29sdmUgaXNzdWVzIHNvIGEgZG9jdW1lbnQgaGFzIGRldGFpbHMgYW5kIGJyb2FkZXIgc3Vw cG9ydC4gDQoNCkJlbmRpbmcgdGhlIHByb2Nlc3MgdGhhdCBrZXB0IElFVEYgcHJvZHVjaW5nIHF1 YWxpdHkgZm9yIHllYXJzIGNyZWF0ZXMgYSBkYW5nZXJvdXMgcHJlY2VkZW50LiBBIFdHIGRyYWZ0 IGFkb3B0aW9uIGNhbGwgaXMgbm90IGEgcGxhY2UgZm9yIHRoYXQuIA0KDQpBbmRyZXcNCg0KU2Vu dCBmcm9tIG15IGlQaG9uZQ0KDQo+IE9uIEFwciA5LCAyMDE4LCBhdCAxMTo0NCBBTSwgSGVuZGVy aWNreCwgV2ltIChOb2tpYSAtIEJFL0FudHdlcnApIDx3aW0uaGVuZGVyaWNreEBub2tpYS5jb20+ 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"=?UTF-8?B?SGVuZGVyaWNreCwgV2ltIChOb2tpYSAtIEJFL0FudHdlcnAp?=" Cc: "mpls@ietf.org" , "Robert Raszuk" , "draft-farrel-mpls-sfc" , "mpls-chairs@ietf.org" , "sfc@ietf.org" Reply-To: "=?UTF-8?B?5b6Q5bCP6JmOKOS5ieWFiCk=?=" Message-ID: X-Mailer: [Alimail-Mailagent revision 948139][W4_5223772][v5ForWebDing][Chrome] MIME-Version: 1.0 References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <2c59588b-51d3-a298-a30b-507082da9261@pi.nu> <33B45D97-52EF-4DE9-A5A1-1A823961F351@nokia.com> , , In-Reply-To: x-aliyun-mail-creator: W4_5223772_v5ForWebDing_M3LTW96aWxsYS81LjAgKE1hY2ludG9zaDsgSW50ZWwgTWFjIE9TIFggMTBfMTJfNikgQXBwbGVXZWJLaXQvNTM3LjM2IChLSFRNTCwgbGlrZSBHZWNrbykgQ2hyb21lLzY1LjAuMzMyNS4xODEgU2FmYXJpLzUzNy4zNg==vN Content-Type: multipart/alternative; boundary="----=ALIBOUNDARY_90902_52561940_5acb3ee0_5b9e4a" Archived-At: Subject: Re: [sfc] =?utf-8?q?=5Bmpls=5D___Working_Group_adoption_of_draft-far?= =?utf-8?q?rel-mpls-sfc?= X-BeenThere: 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PGJyID48L2Jsb2NrcXVvdGU+PC9kaXY+PC9kaXY+ ------=ALIBOUNDARY_90902_52561940_5acb3ee0_5b9e4a-- From nobody Mon Apr 9 03:41:38 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 16483126DCA; Mon, 9 Apr 2018 03:41:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.401 X-Spam-Level: X-Spam-Status: No, score=-1.401 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001] autolearn=no 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 7ze_YiJy1Adi; Mon, 9 Apr 2018 03:41:29 -0700 (PDT) Received: from mail-wr0-f177.google.com (mail-wr0-f177.google.com [209.85.128.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DEC1F126BF6; Mon, 9 Apr 2018 03:41:28 -0700 (PDT) Received: by mail-wr0-f177.google.com with SMTP id m13so9084042wrj.5; Mon, 09 Apr 2018 03:41:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Bwch/zejw0tNIRlFutF9HFX7HIYP2OuDw/rUY+dXd6s=; b=VvuCjEYuJpK3y7DgFuhehdk1Z1EVyDXGaN5OO5oCXSPgBNR0PPOfJloalSbR89+lOR MtG40qwseqMICUWxroYfukFxmZq58sTwOuJbh0ixoJ/XGRDTxm6Ba7xCXLL2flglpVnz G6kasELuTThd8zvg71EizDTCRjxC4EArB9j9bpAen2l8qS3iIvmDbMyKpJ/O13evHtkf BMRI3Y2WdVHKEHYVAbYee2vK0MBLaoI+oUEOoJb85XaKGhtKxmtMvBjGK/i6DSS+GCQ/ yAc2msQxp42Z2jUA3kb2A7TokZZV3U/NaWJd3K/ydCr185usj73Xeq3KM4ooI8DSi13z KKoA== X-Gm-Message-State: AElRT7FLilhLfmJ58KB2mfNBJVXa3kaDWYok7ky/gqx+mgVVzW1iZvjP eItn5Ro+ZAQfWD+oDkiDP4lVFpP/1XtyazuiWbY= X-Google-Smtp-Source: AIpwx49s7SAxhFTpQlL0vEc60KrhxgbNg94iq6PpcFhONM1oCBf2dhG301b0p01HO7usWToWIgqGYmNRQNrHJr7MLxY= X-Received: by 10.223.209.143 with SMTP id h15mr23398509wri.208.1523270486934; Mon, 09 Apr 2018 03:41:26 -0700 (PDT) MIME-Version: 1.0 References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <2c59588b-51d3-a298-a30b-507082da9261@pi.nu> <33B45D97-52EF-4DE9-A5A1-1A823961F351@nokia.com> In-Reply-To: From: Robert Raszuk Date: Mon, 09 Apr 2018 10:41:15 +0000 Message-ID: To: "Henderickx, Wim (Nokia - BE/Antwerp)" Cc: Loa Andersson , mpls , "BRUNGARD, DEBORAH A" , "sfc@ietf.org" , draft-farrel-mpls-sfc , "mpls-chairs@ietf.org" Content-Type: multipart/alternative; boundary="f4f5e80c358845482d0569680c6c" Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Apr 2018 10:41:33 -0000 --f4f5e80c358845482d0569680c6c Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable If you exclude co-authors it is not even equal ;) Best, R. On Mon, Apr 9, 2018, 11:44 Henderickx, Wim (Nokia - BE/Antwerp) < wim.henderickx@nokia.com> wrote: > Loa, the part where I disagree is the rough consensus since you see equal > number of people for/against. I don=E2=80=99t call this rough consensus. > > =EF=BB=BFOn 09/04/2018, 09:46, "Loa Andersson" wrote: > > Wim, et.al., > > There are a number of things that could be discussed in this context. > We might view the IETF process slightly different. > > The IETF allow for "rough consensus". Meaning that there mihgt be > some wg members that are "in the rough", i.e. not supporting the > decisions taken by the part of the working group forming the "rough > consensus" group. > > Being in the rough is sometimes hard, the best way forward is often t= o > accept the decision and try to constructively contribute to e.g. > progressing a document. > > You say that "none of the issues raised have been addressed", the > validity of the statement depends on what you mean by addressed. > > "Addressed" is normally a language that we use when requesting > publication of a document. "Addressed" is more or less synonymous > with "solved". > > In the context of working group adoption poll "addressed" in this > meaning is not necessary. "Addressed" in this context should mean > "recognized" and that all parties are willing to discuss the issues. > > There are a few criteria for accepting a document as a working group > document > > - the document is a good enough starting point > - enough support (rough consensus) in the working group to adopt > the document > - there are enough people in the wg that are willing to work on > the document > - any issues that are recognized in the poll, is deemed to be possibl= e > to during the working group process > > All these three criteria are met. Especially for the third criteria > the wg chair believe that it is easier to resolve the issues if the > working group holds the revision control and make consensus calls > (explicit or implicit) on these issues or other text changes to the > document. > > With this I hope we can can put this process discussion to the side > and instead focus on the technical issues. > > /Loa > mpls wg co-chair > > On 2018-04-08 08:03, Henderickx, Wim (Nokia - BE/Antwerp) wrote: > > Loa, I still don=E2=80=99t see where the consensus was reached. I l= ooked > back at the tracker and you see same amount of people for as well as > against and none of the issues raised have been addressed, based on the > feedback you have seen. > > So I really question the process here and 2nd you should run anothe= r > poll on the new draft given the issues were not addressed. > > > > On 02/04/2018, 16:42, "Loa Andersson" wrote: > > > > Working Group, > > > > I sent this mail some time ago, however I can't see that it > > actually reached it destinations. > > > > /Loa > > > > > > > > > Working Group, Wim, et.al., > > > > > > We had very good support to adopt already version-04. > > > > > > However, after a mail from the author, saying they wanted to > make > > > come changes in the document, we allowed for publication of > > > version-05. > > > > > > This version were adopted as a working group document. > > > > > > Please note the the wg chairs has to do the consensus call > when > > > e.g. adopting a document as working group document. We found > > > that we had a "rough consensus" to adopt the document. > > > > > > This decision was taken by the wg chairs, which is fully > within > > > the IETF process. > > > > > > That decision is taken, the issues that has been pointed out > are > > > noted. These issues need to be resolved on the mailing list > and > > > rough consensus need to be reached for text changes in the > document. > > > > > > Actually the members of the working group have much more > influence on > > > a working group document, than on an individual draft. > > > > > > It would be far better if we now focused on proposing text > changes, > > > rather than discussing processes. > > > > > > /Loa > > > mpls wg co-chair > > > > > > On 2018-03-30 20:59, Henderickx, Wim (Nokia - BE/Antwerp) > wrote: > > >> Deborah, > > >> > > >> There seems to be a flaw in the process here. There were > major > > >> objections to the draft against WG adoption. A new draft wa= s > spun, so > > >> I would expect a new WG adoption call to happen and get the > WG > > >> feedback + decide afterwards if the draft gets adopted or > not. The > > >> last part is completely missing. Without such procedure > whats the > > >> point of having a WG. > > >> > > >> So, it would at least be fair per IETF principles to do > another WG > > >> adoption call and see what happens. > > >> > > >> Cheers, > > >> > > >> Wim > > >> > > >> *From: *"BRUNGARD, DEBORAH A" > > >> *Date: *Thursday, 29 March 2018 at 22:03 > > >> *To: *Robert Raszuk > > >> *Cc: *"Henderickx, Wim (Nokia - BE/Antwerp)" > > >> , "mpls@ietf.org" = , > "=E5=BE=90=E5=B0=8F=E8=99=8E > > >> (=E4=B9=89=E5=85=88)" , "sfc@ie= tf.org" < > sfc@ietf.org>, > > >> draft-farrel-mpls-sfc , > > >> "mpls-chairs@ietf.org" , mpls > > >> > > >> *Subject: *RE: [sfc] [mpls] Working Group adoption of > > >> draft-farrel-mpls-sfc > > >> > > >> Hi Robert, > > >> > > >> Looking at the email threads, there was good support for > this draft on > > >> the list (look at earlier responses) recognizing it as a > needed > > >> approach when the NSH was not supported. The authors have > added > > >> sentences to further clarify this does not replace the > benefits of > > >> NSH, it is not =E2=80=9Cfully redundant=E2=80=9D. Everyone = will have > different > > >> approaches for migration depending on their networks and > probably > > >> large operators will need to support multiple approaches in > various > > >> parts of their network. Just as different approaches for > technology > > >> and control are used. As you say, NSH can not be introduced > overnight. > > >> But SFCs are being used now, and we need to help the indust= ry > > >> understand potential migration approaches and tradeoffs. > > >> > > >> This is now a working group document. If you have an > alternative MPLS > > >> approach, propose it. Often working group documents get > respun several > > >> times. > > >> > > >> Thanks, > > >> > > >> Deborah > > >> > > >> *From:* rraszuk@gmail.com [mailto:rraszuk@gmail.com] *On > Behalf Of > > >> *Robert Raszuk > > >> *Sent:* Thursday, March 29, 2018 3:12 PM > > >> *To:* BRUNGARD, DEBORAH A > > >> *Cc:* Henderickx, Wim (Nokia - BE/Antwerp) < > wim.henderickx@nokia.com>; > > >> mpls@ietf.org; =E5=BE=90=E5=B0=8F=E8=99=8E(=E4=B9=89=E5=85= =88) ; > > >> sfc@ietf.org; draft-farrel-mpls-sfc < > draft-farrel-mpls-sfc@ietf.org>; > > >> mpls-chairs@ietf.org; mpls > > >> *Subject:* Re: [sfc] [mpls] Working Group adoption of > > >> draft-farrel-mpls-sfc > > >> > > >> Dear Deborah, > > >> > > >> Let me perhaps clarify that our comments were not focused o= n > which WG > > >> this draft should progress in, but if it should progress at > all. > > >> > > >> Forwarding plane is not something companies can spin > overnight and > > >> number of us do believe that IETF has already made a call a= s > to > > >> encoding choice of SFC being NSH header. Introducing MPLS > labels to > > >> partially mimic it will likely not help, but disturb the NS= H > > >> deployments. It will also introduce development conflicts > due to both > > >> hardware and human resource constrains. > > >> > > >> Moreover as it was also pointed out during the discussion > and to which > > >> no one responded MPLS in the data plane has been successful= ly > > >> developed and deployed in SFC application with the help of > > >> draft-ietf-bess-service-chaining. Control plane is much > easier to > > >> extend then to define yet one more data plane. > > >> > > >> So what are the real technical reasons to introduce fully > redundant > > >> data plane encoding for SFC ? And that is regardless in > which WG that > > >> would happen. > > >> > > >> Kind regards, > > >> > > >> Robert. > > >> > > >> On Thu, Mar 29, 2018 at 8:57 PM, BRUNGARD, DEBORAH A > > >> > wrote: > > >> > > >> Hi, > > >> > > >> Both myself (AD for MPLS) and Martin (AD for SFC and > SPRING) were > > >> consulted on this draft and we agreed for it to progres= s > in MPLS. > > >> > > >> WG adoption allows the document to be a document of the > working > > >> group vs. the authors. If you have input for the > document, provide > > >> it on the MPLS list. The document will be coordinated a= t > key > > >> transitions with SFC. This is not the first time that > documents > > >> early in their timelines may seem to overlap in the > different > > >> groups, and need the authors to collaborate to sort > out/merge, as > > >> these documents are ultimately products of IETF, and no= t > the > > >> individual authors. > > >> > > >> I noted below it is said that this new version does not > eliminate > > >> the conflict with the other draft=E2=80=99s approach. I= t is best > to say > > >> specifically which text is in conflict and do a proposa= l > to align. > > >> > > >> Thanks, > > >> > > >> Deborah > > >> > > >> *From:* sfc > > >> [mailto:sfc-bounces@ietf.org] > *On > > >> Behalf Of *Robert Raszuk > > >> *Sent:* Thursday, March 29, 2018 8:06 AM > > >> *To:* Henderickx, Wim (Nokia - BE/Antwerp) > > >> wim.henderickx@nokia.com>> > > >> *Cc:* mpls@ietf.org; =E5=BE=90=E5= =B0=8F=E8=99=8E(=E4=B9=89=E5=85=88) > > >> xiaohu.xxh@alibaba-inc.com>>; > > >> sfc@ietf.org; draft-farrel-mpls-sf= c > > >> > > >> draft-farrel-mpls-sfc@ietf.org>>; > > >> mpls-chairs@ietf.org; mpls > > >> > > > >> *Subject:* Re: [sfc] [mpls] Working Group adoption of > > >> draft-farrel-mpls-sfc > > >> > > >> Hey Wim, > > >> > > >> It is very obvious on what basis this adoption happened > .... > > >> > > >> If ADs do not take any serious action here it will > progress smooth & > > >> direct to RFC. > > >> > > >> I am only a bit puzzled why the WG last call has not > started yet on > > >> this :/. > > >> > > >> Best, > > >> > > >> R. > > >> > > >> On Wed, Mar 28, 2018 at 10:25 AM, Henderickx, Wim (Noki= a > - > > >> BE/Antwerp) > > >> wim.henderickx@nokia.com>> wrote: > > >> > > >> Similar comment here on what basis do we adopt this= . > There were > > >> serious issues and although a new draft was posted > they have not > > >> been addressed. On what basis do you adopt this? I > thought IETF > > >> works on basis of consensus and in my view this was > not achieved > > >> so far. > > >> > > >> From iPhone > > >> > > >> > > >> > ------------------------------------------------------------------------ > > >> > > >> *From:*mpls > > >> > > on behalf > > >> of =E5=BE=90=E5=B0=8F=E8=99=8E(=E4=B9=89=E5=85=88) > > >> xiaohu.xxh@alibaba-inc.com>> > > >> *Sent:* Wednesday, March 28, 2018 10:17:04 AM > > >> *To:* mpls; mpls@ietf.org > > >> *Cc:* draft-farrel-mpls-sfc; > > >> mpls-chairs@ietf.org; > > >> sfc@ietf.org > > >> *Subject:* Re: [mpls] Working Group adoption of > > >> draft-farrel-mpls-sfc > > >> > > >> Hi Loa, > > >> > > >> I don't believe the modification in Section 6 of > > >> draft-farrel-mpls-sfc > > >> > > >> ( > https://tools.ietf.org/rfcdiff?url2=3Ddraft-farrel-mpls-sfc-05.txt< > https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__tools.ietf.org_rfc= diff-3Furl2-3Ddraft-2Dfarrel-2Dmpls-2Dsfc-2D05.txt&d=3DDwMFaQ&c=3DLFYZ-o9_H= UMeMTSQicvjIg&r=3D6UhGpW9lwi9dM7jYlxXD8w&m=3DKYDHMX0VHLQFDKH4tDeCulCk3aZJkw= GUKsyTKezhMLQ&s=3DztYp9cmCmsjVMZ_-dGDWFg9kO1Kj7tP9b3VpgMVoJrw&e=3D > >) > > >> > > >> has eliminated the serious conflict with the > SR-MPLS-based SFC > > >> approach as described in > > >> > > >> > https://tools.ietf.org/html/draft-xu-mpls-service-chaining-03< > https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__tools.ietf.org_htm= l_draft-2Dxu-2Dmpls-2Dservice-2Dchaining-2D03&d=3DDwMFaQ&c=3DLFYZ-o9_HUMeMT= SQicvjIg&r=3D6UhGpW9lwi9dM7jYlxXD8w&m=3DKYDHMX0VHLQFDKH4tDeCulCk3aZJkwGUKsy= TKezhMLQ&s=3DG-AiwBZi02SAyGhGBxiXhU_BHgQcuYKJlxpyeTYsgz0&e=3D> > (note > > >> > > >> that this draft has been merged into > > >> > > >> > https://tools.ietf.org/html/draft-xu-clad-spring-sr-service-chaining-00< > https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__tools.ietf.org_htm= l_draft-2Dxu-2Dclad-2Dspring-2Dsr-2Dservice-2Dchaining-2D00&d=3DDwMFaQ&c=3D= LFYZ-o9_HUMeMTSQicvjIg&r=3D6UhGpW9lwi9dM7jYlxXD8w&m=3DKYDHMX0VHLQFDKH4tDeCu= lCk3aZJkwGUKsyTKezhMLQ&s=3DUl-MW_AEUW2CKbWwZ3C0KOPM0gW5dUwxoMFR050i1T0&e=3D > >), > > >> > > >> as had been pointed by many people before. > > >> > > >> Therefore, it seems a little bit unreasonable to > hurry the > > >> adoption of the current version, IMHO. > > >> > > >> Xiaohu > > >> > > >> > > >> > ------------------------------------------------------------------ > > >> > > >> Loa Andersson > > > >> > > >> 2018=E5=B9=B43=E6=9C=8828=E6=97=A5(=E6=98=9F=E6= =9C=9F=E4=B8=89) 15:56 > > >> > > >> > > >> mpls@ietf.org mpls@ietf.org>> > > >> > > >> draft-farrel-mpls-sfc > > >> > > >> draft-farrel-mpls-sfc@ietf.org>>; > > >> > > >> sfc@ietf.org sfc@ietf.org>>; > > >> > > >> mpls-chairs@ietf.org< > mpls-chairs@ietf.org> > > >> > > >> > > >> [mpls] Working Group adoption of > draft-farrel-mpls-sfc > > >> > > >> Working Group, > > >> > > >> > > >> The MPLS working group have decided to adopt > draft-farrel-mpls-sfc-05 as > > >> an MPLS working group document. > > >> > > >> > > >> Can the authors please post draft-ietf-mpls-sfc-00, without > any other > > >> than administrative (filename, version and > dates) changes. > > >> > > >> /Loa > > >> for the MPLS wg chairs > > >> > > >> -- > > >> > > >> Loa Andersson email: > > >> loa@pi.nu > > >> Senior MPLS Expert > > >> Bronze Dragon Consulting phone: +46 > 739 81 21 64 > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > > >> https://www.ietf.org/mailman/listinfo/mpls< > https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.org_mailm= an_listinfo_mpls&d=3DDwMFaQ&c=3DLFYZ-o9_HUMeMTSQicvjIg&r=3D6UhGpW9lwi9dM7jY= lxXD8w&m=3DKYDHMX0VHLQFDKH4tDeCulCk3aZJkwGUKsyTKezhMLQ&s=3DR5fzJWvbB4NSwtL3= I3_FvNHHjJJsuKb8Cxf-2gQw6hI&e=3D > > > > >> > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> > > >> https://www.ietf.org/mailman/listinfo/mpls< > https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.org_mailm= an_listinfo_mpls&d=3DDwMFaQ&c=3DLFYZ-o9_HUMeMTSQicvjIg&r=3D6UhGpW9lwi9dM7jY= lxXD8w&m=3DKYDHMX0VHLQFDKH4tDeCulCk3aZJkwGUKsyTKezhMLQ&s=3DR5fzJWvbB4NSwtL3= I3_FvNHHjJJsuKb8Cxf-2gQw6hI&e=3D > > > > >> > > >> > > >> > > >> > > >> _______________________________________________ > > >> mpls mailing list > > >> mpls@ietf.org > > >> https://www.ietf.org/mailman/listinfo/mpls > > >> > > > > > > > -- > > > > > > Loa Andersson email: loa@pi.nu > > Senior MPLS Expert > > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > > > > -- > > > Loa Andersson email: loa@pi.nu > Senior MPLS Expert > Bronze Dragon Consulting phone: +46 739 81 21 64 > > > --f4f5e80c358845482d0569680c6c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
If you exclude co-authors it is not even equal ;)

Best,
R.
=

On Mon, Apr 9, 2018, = 11:44 Henderickx, Wim (Nokia - BE/Antwerp) <wim.henderickx@nokia.com> wrote:
Loa, the part where I disagree is the rough consensus = since you see equal number of people for/against. I don=E2=80=99t call this= rough consensus.

=EF=BB=BFOn 09/04/2018, 09:46, "Loa Andersson" <loa@pi.nu> wrote= :

=C2=A0 =C2=A0 Wim, et.al.,

=C2=A0 =C2=A0 There are a number of things that could be discussed in this = context.
=C2=A0 =C2=A0 We might view the IETF process slightly different.

=C2=A0 =C2=A0 The IETF allow for "rough consensus". Meaning that = there mihgt be
=C2=A0 =C2=A0 some wg members that are "in the rough", i.e. not s= upporting the
=C2=A0 =C2=A0 decisions taken by the part of the working group forming the = "rough
=C2=A0 =C2=A0 consensus" group.

=C2=A0 =C2=A0 Being in the rough is sometimes hard, the best way forward is= often to
=C2=A0 =C2=A0 accept the decision and try to constructively contribute to e= .g.
=C2=A0 =C2=A0 progressing a document.

=C2=A0 =C2=A0 You say that "none of the issues raised have been addres= sed", the
=C2=A0 =C2=A0 validity of the statement depends on what you mean by address= ed.

=C2=A0 =C2=A0 "Addressed" is normally a language that we use when= requesting
=C2=A0 =C2=A0 publication of a document. "Addressed" is more or l= ess synonymous
=C2=A0 =C2=A0 with "solved".

=C2=A0 =C2=A0 In the context of working group adoption poll "addressed= " in this
=C2=A0 =C2=A0 meaning is not necessary. "Addressed" in this conte= xt should mean
=C2=A0 =C2=A0 "recognized" and that all parties are willing to di= scuss the issues.

=C2=A0 =C2=A0 There are a few criteria for accepting a document as a workin= g group
=C2=A0 =C2=A0 document

=C2=A0 =C2=A0 - the document is a good enough starting point
=C2=A0 =C2=A0 - enough support (rough consensus) in the working group to ad= opt
=C2=A0 =C2=A0 =C2=A0 =C2=A0the document
=C2=A0 =C2=A0 - there are enough people in the wg that are willing to work = on
=C2=A0 =C2=A0 =C2=A0 =C2=A0the document
=C2=A0 =C2=A0 - any issues that are recognized in the poll, is deemed to be= possible
=C2=A0 =C2=A0 =C2=A0 =C2=A0to during the working group process

=C2=A0 =C2=A0 All these three criteria are met. Especially for the third cr= iteria
=C2=A0 =C2=A0 the wg chair believe that it is easier to resolve the issues = if the
=C2=A0 =C2=A0 working group holds the revision control and make consensus c= alls
=C2=A0 =C2=A0 (explicit or implicit) on these issues or other text changes = to the
=C2=A0 =C2=A0 document.

=C2=A0 =C2=A0 With this I hope we can can put this process discussion to th= e side
=C2=A0 =C2=A0 and instead focus on the technical issues.

=C2=A0 =C2=A0 /Loa
=C2=A0 =C2=A0 mpls wg co-chair

=C2=A0 =C2=A0 On 2018-04-08 08:03, Henderickx, Wim (Nokia - BE/Antwerp) wro= te:
=C2=A0 =C2=A0 > Loa, I still don=E2=80=99t see where the consensus was r= eached. I looked back at the tracker and you see same amount of people for = as well as against and none of the issues raised have been addressed, based= on the feedback you have seen.
=C2=A0 =C2=A0 > So I really question the process here and 2nd you should= run another poll on the new draft given the issues were not addressed.
=C2=A0 =C2=A0 >
=C2=A0 =C2=A0 > On 02/04/2018, 16:42, "Loa Andersson" <loa@pi.nu= > wrote:
=C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 Working Group,
=C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 I sent this mail some time ago, howe= ver I can't see that it
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 actually reached it destinations. =C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 /Loa
=C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Working Group, Wim, et.al., =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > We had very good support to ado= pt already version-04.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > However, after a mail from the = author, saying they wanted to make
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > come changes in the document, w= e allowed for publication of
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > version-05.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > This version were adopted as a = working group document.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Please note the the wg chairs h= as to do the consensus call when
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > e.g. adopting a document as wor= king group document. We found
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > that we had a "rough conse= nsus" to adopt the document.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > This decision was taken by the = wg chairs, which is fully within
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > the IETF process.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > That decision is taken, the iss= ues that has been pointed out are
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > noted. These issues need to be = resolved on the mailing list and
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > rough consensus need to be reac= hed for text changes in the document.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Actually the members of the wor= king group have much more influence on
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > a working group document, than = on an individual draft.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > It would be far better if we no= w focused on proposing text changes,
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > rather than discussing processe= s.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > /Loa
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > mpls wg co-chair
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > On 2018-03-30 20:59, Henderickx= , Wim (Nokia - BE/Antwerp) wrote:
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> Deborah,
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> There seems to be a flaw in= the process here. There were major
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> objections to the draft aga= inst WG adoption. A new draft was spun, so
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> I would expect a new WG ado= ption call to happen and get the WG
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> feedback + decide afterward= s if the draft gets adopted or not. The
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> last part is completely mis= sing. Without such procedure whats the
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> point of having a WG.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> So, it would at least be fa= ir per IETF principles to do another WG
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> adoption call and see what = happens.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> Cheers,
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> Wim
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> *From: *"BRUNGARD, DEB= ORAH A" <db3546@att.com>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> *Date: *Thursday, 29 March = 2018 at 22:03
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> *To: *Robert Raszuk <robe= rt@raszuk.net>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> *Cc: *"Henderickx, Wim= (Nokia - BE/Antwerp)"
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> <wim.henderickx@no= kia.com>, "mpls@ietf.org" <mpls@ietf.org>, "=E5= =BE=90=E5=B0=8F=E8=99=8E
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> (=E4=B9=89=E5=85=88)" = <xiaohu.xxh@alibaba-inc.com>, "sfc@ietf.org" <= sfc@ie= tf.org>,
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> draft-farrel-mpls-sfc <<= a href=3D"mailto:draft-farrel-mpls-sfc@ietf.org" target=3D"_blank" rel=3D"n= oreferrer">draft-farrel-mpls-sfc@ietf.org>,
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> "mpls-chairs@ietf.or= g" <mpls-chairs@ietf.org>, mpls
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> <mpls-bounces@ietf.or= g>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> *Subject: *RE: [sfc] [mpls]= Working Group adoption of
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> draft-farrel-mpls-sfc
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> Hi Robert,
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> Looking at the email thread= s, there was good support for this draft on
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> the list (look at earlier r= esponses) recognizing it as a needed
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> approach when the NSH was n= ot supported. The authors have added
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> sentences to further clarif= y this does not replace the benefits of
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> NSH, it is not =E2=80=9Cful= ly redundant=E2=80=9D. Everyone will have different
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> approaches for migration de= pending on their networks and probably
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> large operators will need t= o support multiple approaches in various
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> parts of their network. Jus= t as different approaches for technology
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> and control are used. As yo= u say, NSH can not be introduced overnight.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> But SFCs are being used now= , and we need to help the industry
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> understand potential migrat= ion approaches and tradeoffs.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> This is now a working group= document. If you have an alternative MPLS
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> approach, propose it. Often= working group documents get respun several
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> times.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> Thanks,
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> Deborah
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> *From:* rraszuk@gmail.com [mailto:rraszuk@gmail.com] *On Behalf Of
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> *Robert Raszuk
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> *Sent:* Thursday, March 29,= 2018 3:12 PM
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> *To:* BRUNGARD, DEBORAH A &= lt;d= b3546@att.com>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> *Cc:* Henderickx, Wim (Noki= a - BE/Antwerp) <wim.henderickx@nokia.com>;
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> mpls@ietf.org; =E5=BE=90=E5= =B0=8F=E8=99=8E(=E4=B9=89=E5=85=88) <xiaohu.xxh@alibaba-inc.com<= /a>>;
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> sfc@ietf.org; draft-farrel-mp= ls-sfc <draft-farrel-mpls-sfc@ietf.org>;
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> mpls-chairs@ietf.org;= mpls <mpls-bounces@ietf.org>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> *Subject:* Re: [sfc] [mpls]= Working Group adoption of
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> draft-farrel-mpls-sfc
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> Dear Deborah,
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> Let me perhaps clarify that= our comments were not focused on which WG
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> this draft should progress = in, but if it should progress at all.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> Forwarding plane is not som= ething companies can spin overnight and
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> number of us do believe tha= t IETF has already made a call as to
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> encoding choice of SFC bein= g NSH header. Introducing=C2=A0 MPLS labels to
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> partially mimic it will lik= ely not help, but disturb the NSH
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> deployments. It will also i= ntroduce development conflicts due to both
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> hardware and human resource= constrains.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> Moreover as it was also poi= nted out during the discussion and to which
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> no one responded MPLS in th= e data plane has been successfully
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> developed and deployed in S= FC application with the help of
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> draft-ietf-bess-service-cha= ining. Control plane is much easier to
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> extend then to define yet o= ne more data plane.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> So what are the real techni= cal reasons to introduce fully redundant
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> data plane encoding for SFC= ? And that is regardless in which WG that
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> would happen.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> Kind regards,
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> Robert.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> On Thu, Mar 29, 2018 at 8:5= 7 PM, BRUNGARD, DEBORAH A
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> <db3546@att.com<mailt= o:db= 3546@att.com>> wrote:
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0Hi,
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0Both mys= elf (AD for MPLS) and Martin (AD for SFC and SPRING) were
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0consulte= d on this draft and we agreed for it to progress in MPLS.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0WG adopt= ion allows the document to be a document of the working
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0group vs= . the authors. If you have input for the document, provide
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0it on th= e MPLS list. The document will be coordinated at key
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0transiti= ons with SFC. This is not the first time that documents
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0early in= their timelines may seem to overlap in the different
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0groups, = and need the authors to collaborate to sort out/merge, as
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0these do= cuments are ultimately products of IETF, and not the
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0individu= al authors.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0I noted = below it is said that this new version does not eliminate
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0the conf= lict with the other draft=E2=80=99s approach. It is best to say
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0specific= ally which text is in conflict and do a proposal to align.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0Thanks,<= br> =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0Deborah<= br> =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0*From:* = sfc
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0[mailto:= sfc-bounces@ietf.org<mailto:sfc-bounces@ietf.org>] *On =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0Behalf O= f *Robert Raszuk
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0*Sent:* = Thursday, March 29, 2018 8:06 AM
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0*To:* He= nderickx, Wim (Nokia - BE/Antwerp)
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0<wim.henderickx@nokia.com<mailto:wim.henderickx@nokia.com= >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0*Cc:* mpls@ie= tf.org<mailto:mpls@ietf.org>; =E5=BE=90=E5=B0=8F=E8=99=8E(=E4=B9= =89=E5=85=88)
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0<xiaohu.xxh@alibaba-inc.com<mailto:xiaohu.xxh@alibaba-inc= .com>>;
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0sfc@ietf.org<= /a><mailto:sfc@ietf.org>; draft-farrel-mpls-sfc
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> <draft-farre= l-mpls-sfc@ietf.org<mailto:draft-farrel-mpls-sfc@ietf.or= g>>;
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0mpls-= chairs@ietf.org<mailto:mpls-chairs@ietf.org>; mpls
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0<m= pls-bounces@ietf.org<mailto:mpls-bounces@ietf.org>>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0*Subject= :* Re: [sfc] [mpls] Working Group adoption of
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0draft-fa= rrel-mpls-sfc
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0Hey Wim,=
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0It is ve= ry obvious on what basis this adoption happened ....
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0If ADs d= o not take any serious action here it will progress smooth &
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0direct t= o RFC.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0I am onl= y a bit puzzled why the WG last call has not started yet on
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0this :/.=
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0Best, =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0R.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0On Wed, = Mar 28, 2018 at 10:25 AM, Henderickx, Wim (Nokia -
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0BE/Antwe= rp)
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0<wim.henderickx@nokia.com<mailto:wim.henderickx@nokia.com= >> wrote:
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0Similar comment here on what basis do we adopt this. There were
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0serious issues and although a new draft was posted they have not
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0been addressed. On what basis do you adopt this? I thought IETF
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0works on basis of consensus and in my view this was not achieved
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0so far.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 From iPhone
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> ---------------------------= ---------------------------------------------
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0*From:*mpls
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0<mpls-bounces@ietf.org<mailto:mpls-bounces@ietf.org>> on behalf
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0of =E5=BE=90=E5=B0=8F=E8=99=8E(=E4=B9=89=E5=85=88)
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0<xiaohu.xxh@alibaba-inc.com<mailto:xiaohu.x= xh@alibaba-inc.com>>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0*Sent:* Wednesday, March 28, 2018 10:17:04 AM
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0*To:* mpls; mpls@ietf.org<mailto:mpls@ietf.org>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0*Cc:* draft-farrel-mpls-sfc;
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0mpls-chairs@ietf.org<mailto:mpls-chairs@ietf.org>;<= br> =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0= sfc@ietf.org<mailto:sfc@ietf.org>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0*Subject:* Re: [mpls] Working Group adoption of
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0draft-farrel-mpls-sfc
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0Hi Loa,
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0I don't believe the modification in Section 6 of
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0draft-farrel-mpls-sfc
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> (https://tools.ietf.org/rfcdiff?url2=3Ddraft-farre= l-mpls-sfc-05.txt<https://urldefense.proofpoint.com/v2/url?u=3Dhttps-= 3A__tools.ietf.org_rfcdiff-3Furl2-3Ddraft-2Dfarrel-2Dmpls-2Dsfc-2D05.txt&am= p;d=3DDwMFaQ&c=3DLFYZ-o9_HUMeMTSQicvjIg&r=3D6UhGpW9lwi9dM7jYlxXD8w&= amp;m=3DKYDHMX0VHLQFDKH4tDeCulCk3aZJkwGUKsyTKezhMLQ&s=3DztYp9cmCmsjVMZ_= -dGDWFg9kO1Kj7tP9b3VpgMVoJrw&e=3D>)
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0has eliminated the serious conflict with the SR-MPLS-based SFC
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0approach as described in
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> https://tools.ietf.org/html/draft-xu-mpls-service-chain= ing-03<https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__tools.ietf.= org_html_draft-2Dxu-2Dmpls-2Dservice-2Dchaining-2D03&d=3DDwMFaQ&c= =3DLFYZ-o9_HUMeMTSQicvjIg&r=3D6UhGpW9lwi9dM7jYlxXD8w&m=3DKYDHMX0VHL= QFDKH4tDeCulCk3aZJkwGUKsyTKezhMLQ&s=3DG-AiwBZi02SAyGhGBxiXhU_BHgQcuYKJl= xpyeTYsgz0&e=3D> (note
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0that this draft has been merged into
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> https://tools.ietf.org/html/draft-xu-clad-spr= ing-sr-service-chaining-00<https://urldefense.proofpoint.com= /v2/url?u=3Dhttps-3A__tools.ietf.org_html_draft-2Dxu-2Dclad-2Dspring-2Dsr-2= Dservice-2Dchaining-2D00&d=3DDwMFaQ&c=3DLFYZ-o9_HUMeMTSQicvjIg&= r=3D6UhGpW9lwi9dM7jYlxXD8w&m=3DKYDHMX0VHLQFDKH4tDeCulCk3aZJkwGUKsyTKezh= MLQ&s=3DUl-MW_AEUW2CKbWwZ3C0KOPM0gW5dUwxoMFR050i1T0&e=3D>),<= br> =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0as had been pointed by many people before.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0Therefore, it seems a little bit unreasonable to hurry the
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0adoption of the current version, IMHO.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0Xiaohu
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> ---------------------------= ---------------------------------------
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0Loa Andersson <loa@pi.nu<mailto:loa@pi.nu>>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A02018=E5=B9=B43=E6=9C=8828=E6=97=A5(=E6=98=9F=E6=9C=9F= =E4=B8=89) 15:56
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> mpls@ietf.org<mailto:mpls@ietf= .org><mpls@ietf.org<mailto:mpls@ietf.org>>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0draft-farrel-mpls-sfc
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> <draft-farre= l-mpls-sfc@ietf.org<mailto:draft-farrel-mpls-sfc@ietf.or= g>>;
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> sfc@ietf.org<mailto:sfc@ietf.org= ><sfc@ietf.org<mailto:sfc@ietf.org>>;
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> mpls-chairs@ietf.org&= lt;mailto:mpls-chairs@ietf.org><mpls-chairs@ietf.org<m= ailto:mpls-chairs@ietf.org>>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0[mpls] Working Group adoption of draft-farrel-mpls-sfc<= br> =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0Working Group,
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> The MPLS working group have= decided to adopt draft-farrel-mpls-sfc-05 as
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0an MPLS working group document.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> Can the authors please post= draft-ietf-mpls-sfc-00, without any other
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0than administrative (filename, version and dates) chang= es.
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0/Loa
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0for the MPLS wg chairs
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0--
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 email:
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0loa@pi.nu<mailto:loa@pi.nu>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0Senior MPLS Expert
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0phone: +46 739 81 21 64
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0_______________________________________________
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0mpls mailing list
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0mpls@ietf.org<mailto:mpls@ietf.org>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> https://www.ietf.org/mailman/listinfo/mpls<https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.= ietf.org_mailman_listinfo_mpls&d=3DDwMFaQ&c=3DLFYZ-o9_HUMeMTSQicvjI= g&r=3D6UhGpW9lwi9dM7jYlxXD8w&m=3DKYDHMX0VHLQFDKH4tDeCulCk3aZJkwGUKs= yTKezhMLQ&s=3DR5fzJWvbB4NSwtL3I3_FvNHHjJJsuKb8Cxf-2gQw6hI&e=3D&= gt;
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0_______________________________________________
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0mpls mailing list
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0mpls@ietf.org<mailto:mpls@ietf.org>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> https://www.ietf.org/mailman/listinfo/mpls<https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.= ietf.org_mailman_listinfo_mpls&d=3DDwMFaQ&c=3DLFYZ-o9_HUMeMTSQicvjI= g&r=3D6UhGpW9lwi9dM7jYlxXD8w&m=3DKYDHMX0VHLQFDKH4tDeCulCk3aZJkwGUKs= yTKezhMLQ&s=3DR5fzJWvbB4NSwtL3I3_FvNHHjJJsuKb8Cxf-2gQw6hI&e=3D&= gt;
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> ___________________________= ____________________
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> mpls mailing list
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> mpls@ietf.org
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >> https://www.ietf.org/mailman/listinfo/mpls
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >>
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 --
=C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 Loa Andersson=C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 email: loa@pi.nu<= br> =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 Senior MPLS Expert
=C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 Bronze Dragon Consulting=C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0phone: +46 739 81 21 64
=C2=A0 =C2=A0 >
=C2=A0 =C2=A0 >

=C2=A0 =C2=A0 --


=C2=A0 =C2=A0 Loa Andersson=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 email: loa@pi.nu
=C2=A0 =C2=A0 Senior MPLS Expert
=C2=A0 =C2=A0 Bronze Dragon Consulting=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0phone: +46 739 81 21 64


--f4f5e80c358845482d0569680c6c-- From nobody Mon Apr 9 09:53:17 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F149B12D777; Mon, 9 Apr 2018 09:53:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -12.61 X-Spam-Level: X-Spam-Status: No, score=-12.61 tagged_above=-999 required=5 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, SPF_PASS=-0.001, T_DKIMWL_WL_MED=-0.01, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com 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 WmZNFn12a3Xb; Mon, 9 Apr 2018 09:53:11 -0700 (PDT) Received: from alln-iport-1.cisco.com (alln-iport-1.cisco.com [173.37.142.88]) 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"Zafar Ali (zali)" To: =?utf-8?B?5b6Q5bCP6JmOKOS5ieWFiCk=?= , mpls , "Henderickx, Wim (Nokia - BE/Antwerp)" CC: draft-farrel-mpls-sfc , "mpls@ietf.org" , "sfc@ietf.org" , "mpls-chairs@ietf.org" , Robert Raszuk , "Zafar Ali (zali)" Thread-Topic: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc Thread-Index: AQHTz+y945iAJgMD0ESHGDRc9U3WCKP4pp6A Date: Mon, 9 Apr 2018 16:53:08 +0000 Message-ID: References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <2c59588b-51d3-a298-a30b-507082da9261@pi.nu> <33B45D97-52EF-4DE9-A5A1-1A823961F351@nokia.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/10.9.0.180116 x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.179.97] Content-Type: multipart/alternative; boundary="_000_D41B6C09BC2043C9A045AA9F80989CFAciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Apr 2018 16:53:16 -0000 --_000_D41B6C09BC2043C9A045AA9F80989CFAciscocom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 KzEsDQoNClRoYW5rcw0KDQpSZWdhcmRzIOKApiBaYWZhcg0KDQpGcm9tOiBtcGxzIDxtcGxzLWJv dW5jZXNAaWV0Zi5vcmc+IG9uIGJlaGFsZiBvZiAi5b6Q5bCP6JmOKOS5ieWFiCkiIDx4aWFvaHUu eHhoQGFsaWJhYmEtaW5jLmNvbT4NClJlcGx5LVRvOiAi5b6Q5bCP6JmOKOS5ieWFiCkiIDx4aWFv aHUueHhoQGFsaWJhYmEtaW5jLmNvbT4NCkRhdGU6IE1vbmRheSwgQXByaWwgOSwgMjAxOCBhdCA2 OjIzIEFNDQpUbzogbXBscyA8bXBscy1ib3VuY2VzQGlldGYub3JnPiwgIkhlbmRlcmlja3gsIFdp bSAoTm9raWEgLSBCRS9BbnR3ZXJwKSIgPHdpbS5oZW5kZXJpY2t4QG5va2lhLmNvbT4NCkNjOiBk cmFmdC1mYXJyZWwtbXBscy1zZmMgPGRyYWZ0LWZhcnJlbC1tcGxzLXNmY0BpZXRmLm9yZz4sICJt 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putting it together. Please see my comments below. Thank you -m General: I am in two minds about this document and maybe because the document itself seems to not have clear intent. It is not clear whether this is simply describing what could be done or prescribing what should be done. I take the fact that this is an Informational document as leaning towards "description" but there are pieces of text which clearly look like prescriptive protocol/functional behaviour (although some are not detailed enough to allow for an implementation). I would really appreciate if the objective of this document could be clarified so that the reader knows what to expect. Also, I am not advocating for making this a Standard Track document as I believe it would require a lot of rework but on the other hand I am not sure how much help it provides to the persons that would want to use the concept of hierarchy when deploying SFC in a large domain, nor to those that would need to implement it before that. You'll find specific comments below but that bigger question remains. Also, the Shepherd write-up does not seem to follow the template. Any reason for that? I'd prefer if it was re-written according to the template. Thanks. Specific: Header: please write the submission date in the correct format 1. Introduction Service Function Chaining (SFC) is a technique for prescribing differentiated traffic forwarding policies within an SFC-enabled domain. I am concerned by the fact that this document seems to give another definition to SFC. I'm not saying this is wrong but I'd be much more comfortable if it was simply saying: The SFC architecture is described in detail in [RFC7665], and is not repeated here. This document simply uses that architecture. We assume that some Service Function Paths (SFPs) need to be selected on the basis of application-specific data visible to the network What are the security implications of this assumption? Can we remove that? I think SFC has had it's share of security related discussions. So instead of considering a single SFC Control Plane ([I-D.ietf- sfc-control-plane]) I'd prefer not to reference a document which has been abandoned by the WG Decomposing a network into multiple SFC-enabled domains should permit end-to-end visibility of SFs and SFPs. Is that a wishful outcome or a requirement? The criteria for decomposing a domain into multiple SFC-enabled sub-domains are beyond the scope of this document. These criteria are deployment-specific. While I understand this statement, it kind of defeats a good part of the purpose of the document, doesn't it? 2. Hierarchical Service Function Chaining (hSFC) A hierarchy has multiple levels: the top-most level encompasses the entire network domain to be managed, and lower levels encompass portions of the network. These levels are discussed in the following sub-sections. Should it always be like that or is that just a way and there could be other ways? Can we have more-than-two-levels hierarchies or should they all be top-and-lower? 2.1. Top Level This section describes at length the figure/example but what are the take-aways? Considering the example depicted in Figure 1, a top-level network domain includes SFC data plane components distributed over a wide area, including: o Classifiers (CFs), o Service Function Forwarders (SFFs) and o Sub-domains. Is that an illustrative way to partition the components (e.g., CFs and SFFs part of the top-level) or is that the recommended way? We expect the system to include a top-level control plane having responsibility for configuring forwarding policies and traffic classification rules (see for example, [I-D.ietf-sfc-control-plane]). again, I'd prefer not to reference this doc. More generally, is that needed? I don't think so. 2.2. Lower Levels Same general comment than 2.1. Also, in this section you largely discuss the IBN, which is in fact only introduced after. 3. Internal Boundary Node (IBN) This is the core of the proposal, in my opinion, but it comes very late in the document. If you don't want to rearchitect the whole document you should at least have some text (a sentence at bare minimum) early in the document that says something like : we introduce the concept of an IBN which acts as the gateway between the levels of the hierarchy. We also discuss the options for realizing this function. 3.1.x Is there a recommended way of doing IBN Path Configuration out of the 5 listed? 4. Sub-domain Classifier Another goal of the hierarchical approach is to simplify the mechanisms of scaling in and scaling out SFs. All of the complexities of load-balancing among multiple SFs can be handled within a sub-domain, under control of the classifier, allowing the higher-level domain to be oblivious to the existence of multiple SF instances. I don't see the simplification here. You hide the complexity to the higher level, but it remains in the lower one, doesn't it? 9.1 Please remove: Generic security considerations related to the control plane are discussed in [I-D.ietf-sfc-control-plane]. These considerations apply for both high-level and low-level domains. Nits: s/NSH [RFC8300] or a similar/NSH [RFC8300] or a similar/ One path is shown from edge classifier to SFF1 to Sub-domain#1 (residing in data-center1) to SFF1 to SFF2 (residing in data-center 2) to Sub-domain#2 to SFF2 to network egress. Shouldn't this text be taken out of the figure and integrated in the body of the doc? From nobody Tue Apr 10 08:12:17 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6365E12D95D; Tue, 10 Apr 2018 08:12:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.748 X-Spam-Level: X-Spam-Status: No, score=-1.748 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 AKa5zLrmR1Pm; Tue, 10 Apr 2018 08:12:11 -0700 (PDT) Received: from mail-it0-x22d.google.com (mail-it0-x22d.google.com [IPv6:2607:f8b0:4001:c0b::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 40EFE12711E; Tue, 10 Apr 2018 08:12:11 -0700 (PDT) Received: by mail-it0-x22d.google.com with SMTP id h143-v6so16318007ita.4; Tue, 10 Apr 2018 08:12:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:reply-to:in-reply-to:references:from:date:message-id :subject:to:cc; bh=bXfAEBSMY10bQmSJp7LruqqYf8yd2v+3j9aBx4ZU1OA=; b=bnig0hg52cQFerJRPAetJYCHsmzEL+o/QKRA/IdKCN3gbOGnBnM36VcedGVBWY7xRm pzoWJbFC1bsTfNHCijiRMpGQYv6jLjWwY4WXKUGmc8cnCVF4ruJExFasHmiYLRBvIczx 0n2tLbiGarGXbtYOjlX1a1Yz5MHRoPBRVPrQ+1O9m0Djm8YjuFuAZZPy7meG8+mwDAHf EI6fyp1I8c8rbG28tSx7ryVwBXxvvl0cnNJnQOu5FyrVUzLCBD98KBNDDQXBJKoT2g3N oXxAubzWsxSQgXxzex2+br6nvStQCj444jiNTJ1g49zlg7zJek8VJqM1Xof7yqP94vTL u+gw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :from:date:message-id:subject:to:cc; bh=bXfAEBSMY10bQmSJp7LruqqYf8yd2v+3j9aBx4ZU1OA=; b=MrH9F457lKD7cIIBLTyZIVvmT8A8HID5vGXsGyK2fZanWBN2xvVkUUl7qu/3BopIY4 oUJ6IbH+fRicPFtfAScfBfxBMYLl/tLxuIXPjG08yxAcxC4/UYKWYoNTUb43B+fLbY+R irEFMELI9hucF990Tw0OLdp4PW1261W1tN7GfURzUPkLhC/29JAFZF9OL3wWm1Q07nqj RGe07WiWagdGYJ9yRHNLZ+GHd6neeGa+Q14OfUA6lj/mrscKDvoWFLyGweEK5qQdxK01 C0x9cSKsOa1mYfAyF2R5Gd3UuOz8Y6tTcG6RJMIJGxC63LppbHlKSZopzpmKY2Q6i8IN 8HuA== X-Gm-Message-State: ALQs6tC3NcfTo7cGRV6OO+/HfoNZVuU51U7AOq7FKQTeAb9K5GpEFtqO dZflGK4OIDhOHMvfOPiXeboFU+xjJzQA3SyKyzb1Vw== X-Google-Smtp-Source: AIpwx49XXLTj2IE7EqpJ+JR9WsKljswQ1atBo42L0ydwPKY5rOiI8wXGRM12wQWSI8jtaFnyIM1o/7b7M9j/eizHx9w= X-Received: by 2002:a24:61c5:: with SMTP id s188-v6mr2781695itc.98.1523373130500; Tue, 10 Apr 2018 08:12:10 -0700 (PDT) MIME-Version: 1.0 Received: by 10.192.168.125 with HTTP; Tue, 10 Apr 2018 08:12:10 -0700 (PDT) Reply-To: sarikaya@ieee.org In-Reply-To: <49f64a48-cd4c-db01-7741-66f6c613c77d@nokia.com> References: <49f64a48-cd4c-db01-7741-66f6c613c77d@nokia.com> From: Behcet Sarikaya Date: Tue, 10 Apr 2018 10:12:10 -0500 Message-ID: To: Martin Vigoureux Cc: draft-ietf-sfc-hierarchical@ietf.org, "sfc-chairs@ietf.org" , sfc@ietf.org Content-Type: multipart/alternative; boundary="0000000000004df2c005697ff234" Archived-At: Subject: Re: [sfc] AD review for draft-ietf-sfc-hierarchical-07 X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Apr 2018 15:12:16 -0000 --0000000000004df2c005697ff234 Content-Type: text/plain; charset="UTF-8" Bonjour Martin, On Tue, Apr 10, 2018 at 5:11 AM, Martin Vigoureux < martin.vigoureux@nokia.com> wrote: > Hello, > > I have reviewed this document, thanks to all of you for putting it > together. Please see my comments below. > > Thank you > -m > > > General: > I am in two minds about this document and maybe because the document > itself seems to not have clear intent. > > It is not clear whether this is simply describing what could be done or > prescribing what should be done. I take the fact that this is an > Informational document as leaning towards "description" but there are > pieces of text which clearly look like prescriptive protocol/functional > behaviour (although some are not detailed enough to allow for an > implementation). > > I would really appreciate if the objective of this document could be > clarified so that the reader knows what to expect. > > Also, I am not advocating for making this a Standard Track document as I > believe it would require a lot of rework but on the other hand I am not > sure how much help it provides to the persons that would want to use the > concept of hierarchy when deploying SFC in a large domain, nor to those > that would need to implement it before that. You'll find specific comments > below but that bigger question remains. > > Let me take this one and leave the others to the authors. Also, the Shepherd write-up does not seem to follow the template. > Any reason for that? I'd prefer if it was re-written according to the > template. Thanks. > > You mean this template: doc-writeup-essay-style.html ? Vis-a-vis this template, the Shepherd writeup misses to explain why the WG chose this document to be Informational as opposed to Standard Track. Sorry about that. I think you explained why in the paragraph above. I don't see any other deviation, please let me know if any. Regards, Behcet > > Specific: > Header: > please write the submission date in the correct format > > 1. Introduction > Service Function Chaining (SFC) is a technique for prescribing > differentiated traffic forwarding policies within an SFC-enabled > domain. > I am concerned by the fact that this document seems to give another > definition to SFC. I'm not saying this is wrong but I'd be much more > comfortable if it was simply saying: > > The SFC architecture is described in detail in [RFC7665], and is not > repeated here. This document simply uses that architecture. > > > We assume that some Service Function Paths (SFPs) need to be selected > on the basis of application-specific data visible to the network > What are the security implications of this assumption? Can we remove that? > I think SFC has had it's share of security related discussions. > > So instead of considering a single SFC Control Plane ([I-D.ietf- > sfc-control-plane]) > I'd prefer not to reference a document which has been abandoned by the WG > > Decomposing a network into multiple SFC-enabled domains should permit > end-to-end visibility of SFs and SFPs. > Is that a wishful outcome or a requirement? > > The criteria for decomposing a domain into multiple SFC-enabled > sub-domains are beyond the scope of this document. These criteria > are deployment-specific. > While I understand this statement, it kind of defeats a good part of the > purpose of the document, doesn't it? > > > 2. Hierarchical Service Function Chaining (hSFC) > > A hierarchy has multiple levels: the top-most level encompasses the > entire network domain to be managed, and lower levels encompass > portions of the network. These levels are discussed in the following > sub-sections. > Should it always be like that or is that just a way and there could be > other ways? Can we have more-than-two-levels hierarchies or should they all > be top-and-lower? > > 2.1. Top Level > This section describes at length the figure/example but what are the > take-aways? > > Considering the example depicted in Figure 1, a top-level network > domain includes SFC data plane components distributed over a wide > area, including: > > o Classifiers (CFs), > o Service Function Forwarders (SFFs) and > o Sub-domains. > Is that an illustrative way to partition the components (e.g., CFs and > SFFs part of the top-level) or is that the recommended way? > > We expect the system to include a top-level control plane having > responsibility for configuring forwarding policies and traffic > classification rules (see for example, [I-D.ietf-sfc-control-plane]). > again, I'd prefer not to reference this doc. More generally, is that > needed? I don't think so. > > 2.2. Lower Levels > Same general comment than 2.1. Also, in this section you largely discuss > the IBN, which is in fact only introduced after. > > 3. Internal Boundary Node (IBN) > This is the core of the proposal, in my opinion, but it comes very late in > the document. If you don't want to rearchitect the whole document you > should at least have some text (a sentence at bare minimum) early in the > document that says something like : > we introduce the concept of an IBN which acts as the gateway between > the levels of the hierarchy. We also discuss the options for > realizing this function. > > 3.1.x > Is there a recommended way of doing IBN Path Configuration out of the 5 > listed? > > > 4. Sub-domain Classifier > Another goal of the hierarchical approach is to simplify the > mechanisms of scaling in and scaling out SFs. All of the > complexities of load-balancing among multiple SFs can be handled > within a sub-domain, under control of the classifier, allowing the > higher-level domain to be oblivious to the existence of multiple SF > instances. > I don't see the simplification here. You hide the complexity to the higher > level, but it remains in the lower one, doesn't it? > > > 9.1 > Please remove: > Generic security considerations related to the control plane are > discussed in [I-D.ietf-sfc-control-plane]. These considerations > apply for both high-level and low-level domains. > > > > Nits: > s/NSH [RFC8300] or a similar/NSH [RFC8300] or a similar/ > > One path is shown from edge classifier to SFF1 to Sub-domain#1 > (residing in data-center1) to SFF1 to SFF2 (residing in data-center > 2) to Sub-domain#2 to SFF2 to network egress. > Shouldn't this text be taken out of the figure and integrated in the body > of the doc? > --0000000000004df2c005697ff234 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Bonjour Martin,

<= br>
On Tue, Apr 10, 2018 at 5:11 AM, Martin Vigou= reux <martin.vigoureux@nokia.com> wrote:
Hello,

I have reviewed this document, thanks to all of you for putting it together= . Please see my comments below.

Thank you
-m


General:
I am in two minds about this document and maybe because the document itself= seems to not have clear intent.

It is not clear whether this is simply describing what could be done or pre= scribing what should be done. I take the fact that this is an Informational= document as leaning towards "description" but there are pieces o= f text which clearly look like prescriptive protocol/functional behaviour (= although some are not detailed enough to allow for an implementation).

I would really appreciate if the objective of this document could be clarif= ied so that the reader knows what to expect.

Also, I am not advocating for making this a Standard Track document as I be= lieve it would require a lot of rework but on the other hand I am not sure = how much help it provides to the persons that would want to use the concept= of hierarchy when deploying SFC in a large domain, nor to those that would= need to implement it before that. You'll find specific comments below = but that bigger question remains.

=C2=A0
Let me take this one and leave the o= thers to the authors.

Also, the Shepherd write-up does not seem to follow the template.
Any reason for that? I'd prefer if it was re-written according to the t= emplate. Thanks.

You mean this template:

Vis-a-vis this template, the S= hepherd writeup misses to explain why the WG chose this document to be Info= rmational as opposed to Standard Track.
Sorry about that.
I think you explained why in the paragraph above.

I don't see any other deviation, please let me know if any.

Regards,
Behcet
=C2=A0

Specific:
Header:
please write the submission date in the correct format

1. Introduction
=C2=A0 =C2=A0Service Function Chaining (SFC) is a technique for prescribing=
=C2=A0 =C2=A0differentiated traffic forwarding policies within an SFC-enabl= ed
=C2=A0 =C2=A0domain.
I am concerned by the fact that this document seems to give another definit= ion to SFC. I'm not saying this is wrong but I'd be much more comfo= rtable if it was simply saying:

=C2=A0 =C2=A0The SFC architecture is described in detail in [RFC7665], and = is not
=C2=A0 =C2=A0repeated here. This document simply uses that architecture.

=C2=A0 =C2=A0We assume that some Service Function Paths (SFPs) need to be s= elected
=C2=A0 =C2=A0on the basis of application-specific data visible to the netwo= rk
What are the security implications of this assumption? Can we remove that? = I think SFC has had it's share of security related discussions.

=C2=A0 =C2=A0So instead of considering a single SFC Control Plane ([I-D.iet= f-
=C2=A0 =C2=A0sfc-control-plane])
I'd prefer not to reference a document which has been abandoned by the = WG

=C2=A0 =C2=A0Decomposing a network into multiple SFC-enabled domains should= permit
=C2=A0 =C2=A0end-to-end visibility of SFs and SFPs.
Is that a wishful outcome or a requirement?

=C2=A0 =C2=A0The criteria for decomposing a domain into multiple SFC-enable= d
=C2=A0 =C2=A0sub-domains are beyond the scope of this document.=C2=A0 These= criteria
=C2=A0 =C2=A0are deployment-specific.
While I understand this statement, it kind of defeats a good part of the pu= rpose of the document, doesn't it?


2.=C2=A0 Hierarchical Service Function Chaining (hSFC)

=C2=A0 =C2=A0A hierarchy has multiple levels: the top-most level encompasse= s the
=C2=A0 =C2=A0entire network domain to be managed, and lower levels encompas= s
=C2=A0 =C2=A0portions of the network.=C2=A0 These levels are discussed in t= he following
=C2=A0 =C2=A0sub-sections.
Should it always be like that or is that just a way and there could be othe= r ways? Can we have more-than-two-levels hierarchies or should they all be = top-and-lower?

2.1.=C2=A0 Top Level
This section describes at length the figure/example but what are the take-a= ways?

=C2=A0 =C2=A0Considering the example depicted in Figure 1, a top-level netw= ork
=C2=A0 =C2=A0domain includes SFC data plane components distributed over a w= ide
=C2=A0 =C2=A0area, including:

=C2=A0 =C2=A0o=C2=A0 Classifiers (CFs),
=C2=A0 =C2=A0o=C2=A0 Service Function Forwarders (SFFs) and
=C2=A0 =C2=A0o=C2=A0 Sub-domains.
Is that an illustrative way to partition the components (e.g., CFs and SFFs= part of the top-level) or is that the recommended way?

=C2=A0 =C2=A0We expect the system to include a top-level control plane havi= ng
=C2=A0 =C2=A0responsibility for configuring forwarding policies and traffic=
=C2=A0 =C2=A0classification rules (see for example, [I-D.ietf-sfc-control-p= lane]).
again, I'd prefer not to reference this doc. More generally, is that ne= eded? I don't think so.

2.2.=C2=A0 Lower Levels
Same general comment than 2.1. Also, in this section you largely discuss th= e IBN, which is in fact only introduced after.

3.=C2=A0 Internal Boundary Node (IBN)
This is the core of the proposal, in my opinion, but it comes very late in = the document. If you don't want to rearchitect the whole document you s= hould at least have some text (a sentence at bare minimum) early in the doc= ument that says something like :
=C2=A0 =C2=A0we introduce the concept of an IBN which acts as the gateway b= etween
=C2=A0 =C2=A0the levels of the hierarchy. We also discuss the options for =C2=A0 =C2=A0realizing this function.

3.1.x
Is there a recommended way of doing IBN Path Configuration out of the 5 lis= ted?


4.=C2=A0 Sub-domain Classifier
=C2=A0 =C2=A0Another goal of the hierarchical approach is to simplify the =C2=A0 =C2=A0mechanisms of scaling in and scaling out SFs.=C2=A0 All of the=
=C2=A0 =C2=A0complexities of load-balancing among multiple SFs can be handl= ed
=C2=A0 =C2=A0within a sub-domain, under control of the classifier, allowing= the
=C2=A0 =C2=A0higher-level domain to be oblivious to the existence of multip= le SF
=C2=A0 =C2=A0instances.
I don't see the simplification here. You hide the complexity to the hig= her level, but it remains in the lower one, doesn't it?


9.1
Please remove:
=C2=A0 =C2=A0Generic security considerations related to the control plane a= re
=C2=A0 =C2=A0discussed in [I-D.ietf-sfc-control-plane].=C2=A0 These conside= rations
=C2=A0 =C2=A0apply for both high-level and low-level domains.



Nits:
s/NSH [RFC8300]=C2=A0 or a similar/NSH [RFC8300] or a similar/

=C2=A0 =C2=A0One path is shown from edge classifier to SFF1 to Sub-domain#1=
=C2=A0 =C2=A0(residing in data-center1) to SFF1 to SFF2 (residing in data-c= enter
=C2=A0 =C2=A02) to Sub-domain#2 to SFF2 to network egress.
Shouldn't this text be taken out of the figure and integrated in the bo= dy of the doc?

--0000000000004df2c005697ff234-- From nobody Thu Apr 12 08:04:23 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EBE2012D940; Thu, 12 Apr 2018 08:04:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 MAp1IiGZ-X2i; Thu, 12 Apr 2018 08:04:13 -0700 (PDT) Received: from mail-wr0-x22b.google.com (mail-wr0-x22b.google.com [IPv6:2a00:1450:400c:c0c::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D2E1612D881; Thu, 12 Apr 2018 08:04:12 -0700 (PDT) Received: by mail-wr0-x22b.google.com with SMTP id u46so5450301wrc.11; Thu, 12 Apr 2018 08:04:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding:content-language; bh=rBEjTS23NgpXQzMZLNg38czumA/kdnh1pZX8iPuSpxk=; b=TtJYa7dS4KWZfY5SXlUcpoHwtl9om7Rl4PxCHkCG5ummNoZOgRbI0xO5X8tLp8Wt3a wkrKIsyEX+dRtWI1ZOjNuDYsjs1UC1HBzyCqR22qnQcJa9h9llNdz6XX54cQlO7gKRkT FLsfeyWfN9N5D4mOdj5XzD6tBVyM4raHGhDV6aafO8UC6QMR3/sIze21IdIZtL50hlAf UgczzREGAax3Yut6skHZu+200zZmVcebpMeAT6NLXHGdu8NtbtK9b+Dz27RDqTaZj4k8 qF0G6tdsACyCaiMvM+t3H071eAYMK40FBs0ZEkBfs4l+IyH6vay773JeOn8AAysSLQYW LbRA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=rBEjTS23NgpXQzMZLNg38czumA/kdnh1pZX8iPuSpxk=; b=JKylz8sIgvPjghkFdubtSxP/Gmovi85X9mTn+KU/Zudz5BD3cZ2t6n2CW+j0Tz+Xhe kZWRLu2LdEsN9ZOo884SbeGHlimppj3NeQZhJJS8tZgGD6bBTSfnrgd2QcUeWzTRquBZ BkgQWeoRvqW+3FbHnVTBUsTWgc4eJZN5cqiwlYICJU5hKh4gGPpgZ63bOZb0SgU4Q/VG MNMUOoBevZJkYw9AY7lftie30uCWusE4mF1gLZsLm1eQPQp57Ruk9CAIyGBTJ742rEGj VE5LVSELlrC8rE5hH0L6KRXIOhiTs+iHO3rF5icAtks0yKsIj9EKTJhClCUVcuio3rID +fZg== X-Gm-Message-State: ALQs6tBtn7iuRP5IfipNau3LIY6b/lOrxR3hXWUnQKFwyACZajnRYS8L 0jR3FIYXVUKR9DUYglgZh3hTdeyD X-Google-Smtp-Source: AIpwx4/l3zNGGytUp55WFPREnGvwGLY/bREmfaEUXoab1H1m+keBOdnvaL0dbCCWPegfcV9xg/JMDA== X-Received: by 10.223.158.201 with SMTP id b9mr1034688wrf.215.1523545450674; Thu, 12 Apr 2018 08:04:10 -0700 (PDT) Received: from [172.20.3.97] ([46.218.58.220]) by smtp.gmail.com with ESMTPSA id y9sm4933784wrg.46.2018.04.12.08.04.09 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 12 Apr 2018 08:04:09 -0700 (PDT) To: "Bernier, Daniel" , Robert Raszuk Cc: "mpls@ietf.org" , "sfc@ietf.org" References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <1522554645079.8864@bell.ca> <1522812352107.5966@bell.ca> From: Stewart Bryant Message-ID: <489a9667-f159-4607-5834-b4bacf64989c@gmail.com> Date: Thu, 12 Apr 2018 17:04:09 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <1522812352107.5966@bell.ca> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-GB Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 15:04:15 -0000 Rather than have a process discussion, I think we should go up a level and better understand the technical differences between the two drafts. draft-farrel-mpls-sfc describes the actions at a hop in terms of a tuple that mirrors the SFC approach that allows a short indication of potentially re-entrant chains. In its simplest form it uses a compact MPLS stack to describe an arbitarily complex path that is compatile with simple edge routers which are often challenged in terms of the number of labels that they can push. draft-xu-clad-spring-sr-service-chaining unrolls the path and explicitly calls out each hop and each function into the label stack. This results in a much larger MPLS label stack that will challenge some edge routers. The way that we generally deal with imposition limits is through the use of binding-SIDs, which in the limiting case resolves to the approach in draft-farrel with the limitation that the position on the path is implicit in the label stack size rather than explicitly specified by the SI. Mid-flight path changes (if such things are needed) is clearly simpler with draft-farrel. The short stack in draft-farrel comes at the cost of greater network forwarding stack, and the long stack is the price that draft-xu-clad pays for the reduction in forwarding state. The optimal design point between forwarding and control plane state is something that is dependent on many parameters, and is dependent on many network and operational factors, so much so, that don't think it is wise to rule either out of scope at this stage. The hybrid mode in section 6 of draft-farrel supports the mixed mode in section 7 of the draft. This allows the construction of SFCs that are the concatination of two or more compacted sub-chains. This allows the operator to deploy a solution with the advantages of draft-farrel together with some of the flexibility of draft-xu-clad. At this stage the two drafts are sufficienly different that I think we need to proceed with both at least to the point where we fully understand the detailed consequences of the two approachs and the scenarios where each finds it's niche. After developing a better understanding the detail of each design, their control plane, and operational contexts and how each maps to customer network requirements, we can move the drafts to the appropriate IETF track. Such tracks may be anything from abandonment to IETF standard for one or both of these approaches. Meanwhile I think that we need to focus our efforts on a deeper understanding of the technology and how each might make the Internet work better, rather than spending effort on arguing about IETF process. - Stewart From nobody Thu Apr 12 08:12:11 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1D3A112D965; Thu, 12 Apr 2018 08:12:10 -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, URIBL_BLOCKED=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 N5X5iUvVTK5x; Thu, 12 Apr 2018 08:12:06 -0700 (PDT) Received: from mx0a-00191d01.pphosted.com (mx0b-00191d01.pphosted.com [67.231.157.136]) (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 F1D3512D960; Thu, 12 Apr 2018 08:12:04 -0700 (PDT) Received: from pps.filterd (m0049459.ppops.net [127.0.0.1]) by m0049459.ppops.net-00191d01. (8.16.0.21/8.16.0.21) with SMTP id w3CFAe54010650; Thu, 12 Apr 2018 11:12:02 -0400 Received: from alpi155.enaf.aldc.att.com (sbcsmtp7.sbc.com [144.160.229.24]) by m0049459.ppops.net-00191d01. with ESMTP id 2ha83t33kh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 12 Apr 2018 11:12:01 -0400 Received: from enaf.aldc.att.com (localhost [127.0.0.1]) by alpi155.enaf.aldc.att.com (8.14.5/8.14.5) with ESMTP id w3CFC0nr019265; Thu, 12 Apr 2018 11:12:01 -0400 Received: from zlp27130.vci.att.com (zlp27130.vci.att.com [135.66.87.38]) by alpi155.enaf.aldc.att.com (8.14.5/8.14.5) with ESMTP id w3CFBrJu019145; Thu, 12 Apr 2018 11:11:53 -0400 Received: from zlp27130.vci.att.com (zlp27130.vci.att.com [127.0.0.1]) by zlp27130.vci.att.com (Service) with ESMTP id 501F7400055B; Thu, 12 Apr 2018 15:11:53 +0000 (GMT) Received: from MISOUT7MSGHUBAD.ITServices.sbc.com (unknown [130.9.129.148]) by zlp27130.vci.att.com (Service) with ESMTPS id 3CFF4400053C; Thu, 12 Apr 2018 15:11:53 +0000 (GMT) Received: from MISOUT7MSGUSRCD.ITServices.sbc.com ([169.254.4.37]) by MISOUT7MSGHUBAD.ITServices.sbc.com ([130.9.129.148]) with mapi id 14.03.0361.001; Thu, 12 Apr 2018 11:11:53 -0400 From: "UTTARO, JAMES" To: Stewart Bryant , "Bernier, Daniel" , Robert Raszuk CC: "mpls@ietf.org" , "sfc@ietf.org" Thread-Topic: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc Thread-Index: AQHTx1ZR01rPhkNTVEmjD244z8wxC6Pn1BKAgAAD7oCAAA5cgIABgHiAgAImx4CAAhQdAIACm+4AgA1Vv4D//78PkA== Date: Thu, 12 Apr 2018 15:11:52 +0000 Message-ID: References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <1522554645079.8864@bell.ca> <1522812352107.5966@bell.ca> <489a9667-f159-4607-5834-b4bacf64989c@gmail.com> In-Reply-To: <489a9667-f159-4607-5834-b4bacf64989c@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [135.91.76.120] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2018-04-12_08:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_policy_notspam policy=outbound_policy score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1711220000 definitions=main-1804120150 Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 15:12:10 -0000 +1 -----Original Message----- From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Stewart Bryant Sent: Thursday, April 12, 2018 11:04 AM To: Bernier, Daniel ; Robert Raszuk Cc: mpls@ietf.org; sfc@ietf.org Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc Rather than have a process discussion, I think we should go up a level=20 and better understand the technical differences between the two drafts. draft-farrel-mpls-sfc describes the actions at a hop in terms of a tuple=20 that mirrors the SFC approach that allows a short indication of=20 potentially re-entrant chains. In its simplest form it uses a compact=20 MPLS stack to describe an arbitarily complex path that is compatile with=20 simple edge routers which are often challenged in terms of the number of=20 labels that they can push. draft-xu-clad-spring-sr-service-chaining unrolls the path and explicitly=20 calls out each hop and each function into the label stack. This results=20 in a much larger MPLS label stack that will challenge some edge routers.=20 The way that we generally deal with imposition limits is through the use=20 of binding-SIDs, which in the limiting case resolves to the approach in=20 draft-farrel with the limitation that the position on the path is=20 implicit in the label stack size rather than explicitly specified by the SI= . Mid-flight path changes (if such things are needed) is clearly simpler=20 with draft-farrel. The short stack in draft-farrel comes at the cost of greater network=20 forwarding stack, and the long stack is the price that draft-xu-clad=20 pays for the reduction in forwarding state. The optimal design point between forwarding and control plane state is=20 something that is dependent on many parameters, and is dependent on many=20 network and operational factors, so much so, that don't think it is wise=20 to rule either out of scope at this stage. The hybrid mode in section 6 of draft-farrel supports the mixed mode in=20 section 7 of the draft. This allows the construction of SFCs that are=20 the concatination of two or more compacted sub-chains. This allows the=20 operator to deploy a solution with the advantages of draft-farrel=20 together with some of the flexibility of draft-xu-clad. At this stage the two drafts are sufficienly different that I think we=20 need to proceed with both at least to the point where we fully=20 understand the detailed consequences of the two approachs and the=20 scenarios where each finds it's niche. After developing a better understanding the detail of each design, their=20 control plane, and operational contexts and how each maps to customer=20 network requirements, we can move the drafts to the appropriate IETF=20 track. Such tracks may be anything from abandonment to IETF standard for=20 one or both of these approaches. Meanwhile I think that we need to focus our efforts on a deeper=20 understanding of the technology and how each might make the Internet=20 work better,=A0 rather than spending effort on arguing about IETF process. - Stewart _______________________________________________ sfc mailing list sfc@ietf.org https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.org_mailman= _listinfo_sfc&d=3DDwIF-g&c=3DLFYZ-o9_HUMeMTSQicvjIg&r=3Ds7ZzB4JbPv3nYuoSx5G= y8Q&m=3DsHc8KKHgu76CAgLkfNsMIfWnNnc6IgMiA5m1eRlUIb4&s=3D6RsCWXgjUI-aMZvAu85= xXSLT4pn1Z2LDUEWqijS5C5U&e=3D=20 From nobody Thu Apr 12 08:19:52 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 55CCC12D881; Thu, 12 Apr 2018 08:19:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.791 X-Spam-Level: X-Spam-Status: No, score=-1.791 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, T_DKIM_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); 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Thu, 12 Apr 2018 15:19:38 +0000 From: Alexander Vainshtein To: Stewart Bryant , "Bernier, Daniel" , Robert Raszuk CC: "mpls@ietf.org" , "sfc@ietf.org" Thread-Topic: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc Thread-Index: AQHTx4/0V5oXJ9epS0qKNUITZ6AJ5KPnlH+AgAAOXICAAYB4gIACJsaAgAIUHgCAApvtAIANVcCAgAADNpA= Date: Thu, 12 Apr 2018 15:19:38 +0000 Message-ID: References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <1522554645079.8864@bell.ca> <1522812352107.5966@bell.ca> <489a9667-f159-4607-5834-b4bacf64989c@gmail.com> In-Reply-To: <489a9667-f159-4607-5834-b4bacf64989c@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [147.234.241.1] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; DB3PR03MB0665; 7:KnQIMAPawfzSDJ0PrNuExPrzKVNcHrV9/sK35tDlspdYCDYtvFzNZUPwfUipJ6wxwu7aXycp2PcmtHGfaGWIdXJmxgbUe3gli98Kzh9i35xZnUnxEZZaE+G76pzovAHusoCgDBhO0+WcnSDdbjDty704vE0FfOXziZ9irhYnxRaaunkLAIJFJAqkjU3dDasvo8G/OIf+9BVYYg2r9mhk+htXFubXRRo8kyIl9K9/vHgmclYMaTFXo2FBjGtoDKBS x-ms-exchange-antispam-srfa-diagnostics: SOS; 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DIR:OUT; SFP:1102; SCL:1; SRVR:DB3PR03MB0665; H:DB3PR03MB0969.eurprd03.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; MX:1; A:1; received-spf: None (protection.outlook.com: ecitele.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: Szl+8o9LA3BGyQqn4SGun+ocTm9fRUVkfZoexhrwe2oGwAPPHiBDF9IFeCmeVZUlH361+BeVpR8jQZvBOCgWNir8W8G/dM2A4EntFMJgZAU9nlHqnIeMiVAvDCQWiNR6gP7bCVr/dAbuSaI/QjZQWvyGGvejj52N25d17YaqZtaub6dHJuy/FEZDufp4wm2G spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="windows-1255" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Office365-Filtering-Correlation-Id: 8eb7b29d-4b10-4e43-35bb-08d5a088cec6 X-OriginatorOrg: ecitele.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8eb7b29d-4b10-4e43-35bb-08d5a088cec6 X-MS-Exchange-CrossTenant-originalarrivaltime: 12 Apr 2018 15:19:38.6948 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 2c514a61-08de-4519-b4c0-921fef62c42a X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB3PR03MB0665 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 15:19:50 -0000 Stewart and all, I concur with Stewart with one minor correction: the "simple edge routers"= are not the only category of routers that would have problems with imposi= tion of a very deep label stack. And the problem with such stacks goes bey= ond imposition if effective ECMP is supposed to be used by transit routers= , because the labels that carry entropy are located somewhere at the botto= m of the label stack and therefore may be not readable by transit routers = even if imposition succeeded... My 2c, Sasha Office: +972-39266302 Cell: +972-549266302 Email: Alexander.Vainshtein@ecitele.com -----Original Message----- From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Stewart Bryant Sent: Thursday, April 12, 2018 6:04 PM To: Bernier, Daniel ; Robert Raszuk Cc: mpls@ietf.org; sfc@ietf.org Subject: Re: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc Rather than have a process discussion, I think we should go up a level and= better understand the technical differences between the two drafts. draft-farrel-mpls-sfc describes the actions at a hop in terms of a tuple t= hat mirrors the SFC approach that allows a short indication of potentially= re-entrant chains. In its simplest form it uses a compact MPLS stack to d= escribe an arbitarily complex path that is compatile with simple edge rout= ers which are often challenged in terms of the number of labels that they = can push. draft-xu-clad-spring-sr-service-chaining unrolls the path and explicitly c= alls out each hop and each function into the label stack. This results in = a much larger MPLS label stack that will challenge some edge routers.=20 The way that we generally deal with imposition limits is through the use o= f binding-SIDs, which in the limiting case resolves to the approach in dra= ft-farrel with the limitation that the position on the path is implicit in= the label stack size rather than explicitly specified by the SI. Mid-flight path changes (if such things are needed) is clearly simpler wit= h draft-farrel. The short stack in draft-farrel comes at the cost of greater network forwa= rding stack, and the long stack is the price that draft-xu-clad pays for t= he reduction in forwarding state. The optimal design point between forwarding and control plane state is som= ething that is dependent on many parameters, and is dependent on many netw= ork and operational factors, so much so, that don't think it is wise to ru= le either out of scope at this stage. The hybrid mode in section 6 of draft-farrel supports the mixed mode in se= ction 7 of the draft. This allows the construction of SFCs that are the co= ncatination of two or more compacted sub-chains. This allows the operator = to deploy a solution with the advantages of draft-farrel together with som= e of the flexibility of draft-xu-clad. At this stage the two drafts are sufficienly different that I think we nee= d to proceed with both at least to the point where we fully understand the= detailed consequences of the two approachs and the scenarios where each f= inds it's niche. After developing a better understanding the detail of each design, their c= ontrol plane, and operational contexts and how each maps to customer netwo= rk requirements, we can move the drafts to the appropriate IETF track. Suc= h tracks may be anything from abandonment to IETF standard for one or both= of these approaches. Meanwhile I think that we need to focus our efforts on a deeper understand= ing of the technology and how each might make the Internet work better,=A0= rather than spending effort on arguing about IETF process. - Stewart _______________________________________________ mpls mailing list mpls@ietf.org https://www.ietf.org/mailman/listinfo/mpls __________________________________________________________________________= _ This e-mail message is intended for the recipient only and contains inform= ation which is=20 CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece= ived this=20 transmission in error, please inform us by e-mail, phone or fax, and then = delete the original=20 and all copies thereof. __________________________________________________________________________= _ From nobody Thu Apr 12 08:32:04 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 92D7F12D960; Thu, 12 Apr 2018 08:31:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.399 X-Spam-Level: X-Spam-Status: No, score=-1.399 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 CulQ53bOxBpq; Thu, 12 Apr 2018 08:31:54 -0700 (PDT) Received: from mail-wr0-x231.google.com (mail-wr0-x231.google.com [IPv6:2a00:1450:400c:c0c::231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1F29E126CD6; Thu, 12 Apr 2018 08:31:53 -0700 (PDT) Received: by mail-wr0-x231.google.com with SMTP id z73so5544957wrb.0; Thu, 12 Apr 2018 08:31:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc; bh=RTBNaXT+kpNRY5wtiSrn/P+s+LwhR7nFAKPYQ5Gj95M=; b=Q/QxRZUjr8QkuQ9jkKaWbDkfS1yu/q/x6vx/wpgH3aDdgT0vy8lhrLQHE2NKS6iSyq HHZPa3iRRIGzXSzLeefpTMKVDA3k6lbbaMc+QLGGyMR32ulO5jeXVvrqhEr49t9gwcFQ rDyCb8sYino5flNML/dsMxXcndYRbBhDuBfUWyflExqcrXBrRUcMze+mI1It32KVwGUp foNegVQlSsKEMSQ2PyZPfsiasvaQ6YBego8qIJUMV3Z+EMfwpgcNWknWVVk/KHcLUhBY H85v9le3M5lRm9bnb+GVr1c5yWygphJHdOQ8KwB2lGKprrlNLPxkBDGzLkCVD1nWZ3iX tpdw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to:cc; bh=RTBNaXT+kpNRY5wtiSrn/P+s+LwhR7nFAKPYQ5Gj95M=; b=l9hbcj0KJBQPj/Edtvpmfb5yJKVYVUTWreWlGprDhy3yPAwUGbEXDYXukKb7tcXr+U aJY0sfSQur53Z44gLPvHSWwxvUTNrrICYNKpPjjFna+Nro+kr9oaM1SMeb+xeXlNHyj0 vmjUWJGA+/JD24ICo52E5rWxccm4+LuHdAwSCkW0YVr6MWUZq6pZwQWAmQWcujgscEdZ pr2gnRVOSF8OVMNhq2Pjgpna6MXQF1J6hT3pqlOC4qmCvKU/ryaLDIBf82QY7E5SEGE+ 7HCEEXV7eFwCWVAruxNA14g65iQhse5K4v+miDZuIFe2za6blDOv+wpo6LPrFoFTc3F8 EiXQ== X-Gm-Message-State: ALQs6tAxCRSDbWXcitZAL0RKDr+P6FSrTVZPmsjxWByIxMvsRPIgiYEr RJtFdSE4MTlzNNMB4L/bavkU9Fv+lgariFJoBb4= X-Google-Smtp-Source: AIpwx49fcFpUSU6YlmPNTyroH1CGyeSnW78E71WbTKDut3NCutvWiNms/r/uq4zoYdZ50En9GkT12FmuMVlXquwIhQI= X-Received: by 10.223.166.102 with SMTP id k93mr1195055wrc.231.1523547112177; Thu, 12 Apr 2018 08:31:52 -0700 (PDT) MIME-Version: 1.0 Sender: rraszuk@gmail.com Received: by 10.28.222.197 with HTTP; Thu, 12 Apr 2018 08:31:51 -0700 (PDT) In-Reply-To: <489a9667-f159-4607-5834-b4bacf64989c@gmail.com> References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <1522554645079.8864@bell.ca> <1522812352107.5966@bell.ca> <489a9667-f159-4607-5834-b4bacf64989c@gmail.com> From: Robert Raszuk Date: Thu, 12 Apr 2018 17:31:51 +0200 X-Google-Sender-Auth: hlQCvxj7kt899nVlA6QaBJyi7gE Message-ID: To: Stewart Bryant Cc: "Bernier, Daniel" , "mpls@ietf.org" , "sfc@ietf.org" Content-Type: multipart/alternative; boundary="f403045cf0786b87450569a8744c" Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 15:31:57 -0000 --f403045cf0786b87450569a8744c Content-Type: text/plain; charset="UTF-8" Hi Stewart, 1. > In its simplest form it uses a compact MPLS stack to describe an arbitarily complex path What exactly is "compact" in MPLS label stack as defined in draft-ietf-mpls-sfc ? ------------------- ~ Tunnel Labels ~ +-------------------+ ~ Optional ~ ~ Entropy Label ~ +-------------------+ - - - | SFC Context Label | +-------------------+ Basic unit of MPLS label stack for SFC | SF Label | +-------------------+ - - - | SFC Context Label | +-------------------+ Basic unit of MPLS label stack for SFC | SF Label | +-------------------+ - - - ~ ~ +-------------------+ - - - | SFC Context Label | +-------------------+ Basic unit of MPLS label stack for SFC | SF Label | +-------------------+ - - - | | ~ Payload ~ | | ------------------- Figure 3: The MPLS SFC Label Stack for Label Stacking 2. > draft-xu-clad-spring-sr-service-chaining unrolls the path and explicitly calls out each hop > and each function into the label stack. That is precisely what draft-ietf-mpls-sfc also does as far as SF's are concerned. Other network elements which do not participate in SFs are not aware of service function states and all they are doing is transporting mpls packets to and between SFs. Both drafts are identical here. What differences in network state do you see in transit nodes ? With that please keep in mind that LDP's network state with locally significant labels is far greater then SR network state with global/domain wide labels. Last the core of the comments where focused on using NSH and not to make any judgement which way of producing alternatives to it is better/worse. Best, R. On Thu, Apr 12, 2018 at 5:04 PM, Stewart Bryant wrote: > > Rather than have a process discussion, I think we should go up a level and > better understand the technical differences between the two drafts. > > draft-farrel-mpls-sfc describes the actions at a hop in terms of a tuple > that mirrors the SFC approach that allows a short indication of potentially > re-entrant chains. In its simplest form it uses a compact MPLS stack to > describe an arbitarily complex path that is compatile with simple edge > routers which are often challenged in terms of the number of labels that > they can push. > > draft-xu-clad-spring-sr-service-chaining unrolls the path and explicitly > calls out each hop and each function into the label stack. This results in > a much larger MPLS label stack that will challenge some edge routers. The > way that we generally deal with imposition limits is through the use of > binding-SIDs, which in the limiting case resolves to the approach in > draft-farrel with the limitation that the position on the path is implicit > in the label stack size rather than explicitly specified by the SI. > > Mid-flight path changes (if such things are needed) is clearly simpler > with draft-farrel. > > The short stack in draft-farrel comes at the cost of greater network > forwarding stack, and the long stack is the price that draft-xu-clad pays > for the reduction in forwarding state. > > The optimal design point between forwarding and control plane state is > something that is dependent on many parameters, and is dependent on many > network and operational factors, so much so, that don't think it is wise to > rule either out of scope at this stage. > > The hybrid mode in section 6 of draft-farrel supports the mixed mode in > section 7 of the draft. This allows the construction of SFCs that are the > concatination of two or more compacted sub-chains. This allows the operator > to deploy a solution with the advantages of draft-farrel together with some > of the flexibility of draft-xu-clad. > > At this stage the two drafts are sufficienly different that I think we > need to proceed with both at least to the point where we fully understand > the detailed consequences of the two approachs and the scenarios where each > finds it's niche. > > After developing a better understanding the detail of each design, their > control plane, and operational contexts and how each maps to customer > network requirements, we can move the drafts to the appropriate IETF track. > Such tracks may be anything from abandonment to IETF standard for one or > both of these approaches. > > Meanwhile I think that we need to focus our efforts on a deeper > understanding of the technology and how each might make the Internet work > better, rather than spending effort on arguing about IETF process. > > - Stewart > > --f403045cf0786b87450569a8744c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Stewart,
1.=C2=A0

> In its simplest form it uses a compact MPLS= stack to describe an arbitarily complex path

What exactly is= "compact" in MPLS label stack as defined in draft-ietf-mpls-sfc = ?=C2=A0


     -------------------
    ~   Tunnel Labels   ~
    +-------------------+
    ~     Optional      ~
    ~   Entropy Label   ~
    +-------------------+ - - -
    | SFC Context Label |
    +-------------------+  Basic unit of MPLS label stack for SFC
    |     SF Label      |
    +-------------------+ - - -
    | SFC Context Label |
    +-------------------+  Basic unit of MPLS label stack for SFC
    |     SF Label      |
    +-------------------+ - - -
    ~                   ~
    +-------------------+ - - -
    | SFC Context Label |
    +-------------------+  Basic unit of MPLS label stack for SFC
    |     SF Label      |
    +-------------------+ - - -
    |                   |
    ~    Payload        ~
    |                   |
     -------------------

           Figure 3: The MPLS SFC Label Stack for Label Stacking

2.=C2=A0

> draft-xu-clad-spring-sr-service-chaining unrolls the path and explicitly calls out e= ach hop=C2=A0
>= ; and each function into the label stack.

That is precise= ly what draft-ietf-mpls-sfc also does as far as SF's are concerned.=C2= =A0

Other network elem= ents which do not participate in SFs are not aware of service function stat= es and all they are doing is transporting mpls packets to and between SFs. = Both drafts are identical here.=C2=A0

What differences in network state do you see in transit nod= es ? With that please keep in mind that LDP's network state with locall= y significant labels is far greater then SR network state with global/domai= n wide labels.=C2=A0

L= ast the core of the comments where focused on using NSH and not to make any= judgement which way of producing alternatives to it is better/worse.=C2=A0=

Best,
R.


On Thu, Apr 12, 2018 at 5:04 PM, Stewart= Bryant <stewart.bryant@gmail.com> wrote:

Rather than have a process discussion, I think we should go up a level and = better understand the technical differences between the two drafts.

draft-farrel-mpls-sfc describes the actions at a hop in terms of a tuple th= at mirrors the SFC approach that allows a short indication of potentially r= e-entrant chains. In its simplest form it uses a compact MPLS stack to desc= ribe an arbitarily complex path that is compatile with simple edge routers = which are often challenged in terms of the number of labels that they can p= ush.

draft-xu-clad-spring-sr-service-chaining unrolls the path and explicit= ly calls out each hop and each function into the label stack. This results = in a much larger MPLS label stack that will challenge some edge routers. Th= e way that we generally deal with imposition limits is through the use of b= inding-SIDs, which in the limiting case resolves to the approach in draft-f= arrel with the limitation that the position on the path is implicit in the = label stack size rather than explicitly specified by the SI.

Mid-flight path changes (if such things are needed) is clearly simpler with= draft-farrel.

The short stack in draft-farrel comes at the cost of greater network forwar= ding stack, and the long stack is the price that draft-xu-clad pays for the= reduction in forwarding state.

The optimal design point between forwarding and control plane state is some= thing that is dependent on many parameters, and is dependent on many networ= k and operational factors, so much so, that don't think it is wise to r= ule either out of scope at this stage.

The hybrid mode in section 6 of draft-farrel supports the mixed mode in sec= tion 7 of the draft. This allows the construction of SFCs that are the conc= atination of two or more compacted sub-chains. This allows the operator to = deploy a solution with the advantages of draft-farrel together with some of= the flexibility of draft-xu-clad.

At this stage the two drafts are sufficienly different that I think we need= to proceed with both at least to the point where we fully understand the d= etailed consequences of the two approachs and the scenarios where each find= s it's niche.

After developing a better understanding the detail of each design, their co= ntrol plane, and operational contexts and how each maps to customer network= requirements, we can move the drafts to the appropriate IETF track. Such t= racks may be anything from abandonment to IETF standard for one or both of = these approaches.

Meanwhile I think that we need to focus our efforts on a deeper understandi= ng of the technology and how each might make the Internet work better,=C2= =A0 rather than spending effort on arguing about IETF process.

- Stewart


--f403045cf0786b87450569a8744c-- From nobody Thu Apr 12 09:05:51 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CB710127010; Thu, 12 Apr 2018 09:05:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.699 X-Spam-Level: X-Spam-Status: No, score=-2.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 8bDZoBczYNve; Thu, 12 Apr 2018 09:05:35 -0700 (PDT) Received: from mail-wm0-x22e.google.com (mail-wm0-x22e.google.com [IPv6:2a00:1450:400c:c09::22e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AECFA126CE8; Thu, 12 Apr 2018 09:05:34 -0700 (PDT) Received: by mail-wm0-x22e.google.com with SMTP id b127so12826419wmf.5; Thu, 12 Apr 2018 09:05:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language; bh=45n3M52tYWGckTOqBHFTJociTvt44kP1LAMsEf0Jpuw=; b=AvFQ/JuY4szhL4PSnNje9nUbVQ6JjE/C1PDDdcuRnKJL2SUQH6FdDGyG6CpnTV2LeH AHIYlJ+LFCjzqA0hU1QGnpW9GMl7s/qGn/A5PNMeuAeg8mCgoH4b5KQsPXls0UCxIz3e yLDBhvGhzns+MDswo+rhRk0tiqfKp1vfaYosdVtlEJER/US1+THxd5GcUNC0u3sjqHTb NH8DcKPwsTGYgdGZKNI/NWXQppsNxp5Rbcsu4Kuj5E8dQimZVJVJXCpPl+i/yO2TYpxF HIhCCnS9UuebSi9837Od0QaFdNyx8s+U7RCscQdnotcbQ+XUS62Uj5tVslrUP3xYlSWR rkkw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language; bh=45n3M52tYWGckTOqBHFTJociTvt44kP1LAMsEf0Jpuw=; b=ALhle9ZPetfADCydyKDDnfkFyFG/yWGKPxiFwk8FwSa5Ak0z7FpaWWh40bwvsSi3Ru un9buuZiSnKsezCp3X4lukzns/Y0qI+FpZGSsh9Oi0qTmuLuhmNzJ0EauAKXLbRXDqXl avjKM48hizP/GY25ZElbDnpDaCK+uUBVN8kkFWkmwyrrDoNPMQ0jo96Puyy/lvL/xQbL X3QJSuX+QvhypNtBjAvEjKrYwpQlI24JxSxlj4NZYgobJXMa7jTLLzdQbsUqO4AD4FiQ P+kUqYdmPbrh0JI3pSZsgeyaF+nzTYrT+uM/TxU1FGSHnGjB0dwGJqOHgD12m3Y4jTmp lLAA== X-Gm-Message-State: ALQs6tDj8pxFrmDHToaiOvjoARUCg9JjCIbv2TkQIJ88D6D75X9TteXC ThpP3kevxkqpYGRZzX9T60VAjDYn X-Google-Smtp-Source: AIpwx4/EphSAYQx3/YAZAuinHk8IgxzMvNGNFcVA3w5VNFtEWTI+15mLsAkmhdMtccyld8Z1dgd6Jg== X-Received: by 10.28.111.149 with SMTP id c21mr958433wmi.154.1523549132798; Thu, 12 Apr 2018 09:05:32 -0700 (PDT) Received: from [172.20.3.97] ([46.218.58.220]) by smtp.gmail.com with ESMTPSA id e13sm7729012wrg.79.2018.04.12.09.05.31 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 12 Apr 2018 09:05:32 -0700 (PDT) To: Robert Raszuk Cc: "mpls@ietf.org" , "sfc@ietf.org" References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <1522554645079.8864@bell.ca> <1522812352107.5966@bell.ca> <489a9667-f159-4607-5834-b4bacf64989c@gmail.com> From: Stewart Bryant Message-ID: Date: Thu, 12 Apr 2018 18:05:31 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------F1572980460347252AB494E4" Content-Language: en-GB Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 16:05:41 -0000 This is a multi-part message in MIME format. --------------F1572980460347252AB494E4 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Hi Robert, On 12/04/2018 17:31, Robert Raszuk wrote: > Hi Stewart, > > 1. > > > In its simplest form it uses a compact MPLS stack to describe an > arbitarily complex path > > What exactly is "compact" in MPLS label stack as defined in > draft-ietf-mpls-sfc ? I was talking about the lable swapping method in Section 5. The section 6 text below makes sense when you need to concatinate a number of tuples. Obviously there comes a point where optimum stack size swaps from one design to the other. That is why I don't want to make a choice without understanding the properties and operational considerations. > > > ------------------- > ~ Tunnel Labels ~ > +-------------------+ > ~ Optional ~ > ~ Entropy Label ~ > +-------------------+ - - - > | SFC Context Label | > +-------------------+ Basic unit of MPLS label stack for SFC > | SF Label | > +-------------------+ - - - > | SFC Context Label | > +-------------------+ Basic unit of MPLS label stack for SFC > | SF Label | > +-------------------+ - - - > ~ ~ > +-------------------+ - - - > | SFC Context Label | > +-------------------+ Basic unit of MPLS label stack for SFC > | SF Label | > +-------------------+ - - - > | | > ~ Payload ~ > | | > ------------------- > > Figure 3: The MPLS SFC Label Stack for Label Stacking > > 2. > > > draft-xu-clad-spring-sr-service-chaining unrolls the path and > explicitly calls out each hop > > and each function into the label stack. > > That is precisely what draft-ietf-mpls-sfc also does as far as SF's > are concerned. No, it has two modes, each with different properties, and these have different properties from draft-xu-clad. > > Other network elements which do not participate in SFs are not aware > of service function states and all they are doing is transporting mpls > packets to and between SFs. Both drafts are identical here. > > What differences in network state do you see in transit nodes ? With > that please keep in mind that LDP's network state with locally > significant labels is far greater then SR network state with > global/domain wide labels. Are well, there is the whole question of whether nodal labels in the IGP is SR or MPLS. My understanding of the archaeology of MPLS is that putting such labels in the IGP was the original design choice, but this was abandoned in favour of more expeditious deployment ... but we digress. You base question is however more complex than it seems on the surface. NP memory state is enormously more expensive ($$$) than route processor state. SR pushes that expensive state to the most cost sensitive components in the network (the ingress routers). The payback is a reduction in path state in the core. On the otherhand binding SIDs add back that state. So this question can only be adresssed in the wider contest of the network topology, the application set, the implementation constraints and the set of SR features needed. > > Last the core of the comments where focused on using NSH and not to > make any judgement which way of producing alternatives to it is > better/worse. If you have end to end NSH, then use it. Both of these drafts focus on what to do if you do not have end to end  NSH technology available. - Stewart > > Best, > R. > > > On Thu, Apr 12, 2018 at 5:04 PM, Stewart Bryant > > wrote: > > > Rather than have a process discussion, I think we should go up a > level and better understand the technical differences between the > two drafts. > > draft-farrel-mpls-sfc describes the actions at a hop in terms of a > tuple that mirrors the SFC approach that allows a short indication > of potentially re-entrant chains. In its simplest form it uses a > compact MPLS stack to describe an arbitarily complex path that is > compatile with simple edge routers which are often challenged in > terms of the number of labels that they can push. > > draft-xu-clad-spring-sr-service-chaining unrolls the path and > explicitly calls out each hop and each function into the label > stack. This results in a much larger MPLS label stack that will > challenge some edge routers. The way that we generally deal with > imposition limits is through the use of binding-SIDs, which in the > limiting case resolves to the approach in draft-farrel with the > limitation that the position on the path is implicit in the label > stack size rather than explicitly specified by the SI. > > Mid-flight path changes (if such things are needed) is clearly > simpler with draft-farrel. > > The short stack in draft-farrel comes at the cost of greater > network forwarding stack, and the long stack is the price that > draft-xu-clad pays for the reduction in forwarding state. > > The optimal design point between forwarding and control plane > state is something that is dependent on many parameters, and is > dependent on many network and operational factors, so much so, > that don't think it is wise to rule either out of scope at this stage. > > The hybrid mode in section 6 of draft-farrel supports the mixed > mode in section 7 of the draft. This allows the construction of > SFCs that are the concatination of two or more compacted > sub-chains. This allows the operator to deploy a solution with the > advantages of draft-farrel together with some of the flexibility > of draft-xu-clad. > > At this stage the two drafts are sufficienly different that I > think we need to proceed with both at least to the point where we > fully understand the detailed consequences of the two approachs > and the scenarios where each finds it's niche. > > After developing a better understanding the detail of each design, > their control plane, and operational contexts and how each maps to > customer network requirements, we can move the drafts to the > appropriate IETF track. Such tracks may be anything from > abandonment to IETF standard for one or both of these approaches. > > Meanwhile I think that we need to focus our efforts on a deeper > understanding of the technology and how each might make the > Internet work better,  rather than spending effort on arguing > about IETF process. > > - Stewart > > --------------F1572980460347252AB494E4 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit


Hi Robert,

On 12/04/2018 17:31, Robert Raszuk wrote:
Hi Stewart,

1. 

> In its simplest form it uses a compact MPLS stack to describe an arbitarily complex path

What exactly is "compact" in MPLS label stack as defined in draft-ietf-mpls-sfc ?

I was talking about the lable swapping method in Section 5.

The section 6 text below makes sense when you need to concatinate a number of tuples. Obviously there comes a point where optimum stack size swaps from one design to the other. That is why I don't want to make a choice without understanding the properties and operational considerations.



     -------------------
    ~   Tunnel Labels   ~
    +-------------------+
    ~     Optional      ~
    ~   Entropy Label   ~
    +-------------------+ - - -
    | SFC Context Label |
    +-------------------+  Basic unit of MPLS label stack for SFC
    |     SF Label      |
    +-------------------+ - - -
    | SFC Context Label |
    +-------------------+  Basic unit of MPLS label stack for SFC
    |     SF Label      |
    +-------------------+ - - -
    ~                   ~
    +-------------------+ - - -
    | SFC Context Label |
    +-------------------+  Basic unit of MPLS label stack for SFC
    |     SF Label      |
    +-------------------+ - - -
    |                   |
    ~    Payload        ~
    |                   |
     -------------------

           Figure 3: The MPLS SFC Label Stack for Label Stacking

2. 

> draft-xu-clad-spring-sr-service-chaining unrolls the path and explicitly calls out each hop 
> and each function into the label stack.

That is precisely what draft-ietf-mpls-sfc also does as far as SF's are concerned.

No, it has two modes, each with different properties, and these have different properties from draft-xu-clad.


Other network elements which do not participate in SFs are not aware of service function states and all they are doing is transporting mpls packets to and between SFs. Both drafts are identical here. 

What differences in network state do you see in transit nodes ? With that please keep in mind that LDP's network state with locally significant labels is far greater then SR network state with global/domain wide labels.

Are well, there is the whole question of whether nodal labels in the IGP is SR or MPLS. My understanding of the archaeology of MPLS is that putting such labels in the IGP was the original design choice, but this was abandoned in favour of more expeditious deployment ... but we digress.

You base question is however more complex than it seems on the surface. NP memory state is enormously more expensive ($$$) than route processor state. SR pushes that expensive state to the most cost sensitive components in the network (the ingress routers). The payback is a reduction in path state in the core. On the otherhand binding SIDs add back that state. So this question can only be adresssed in the wider contest of the network topology, the application set, the implementation constraints and the set of SR features needed.


Last the core of the comments where focused on using NSH and not to make any judgement which way of producing alternatives to it is better/worse.

If you have end to end NSH, then use it. Both of these drafts focus on what to do if you do not have end to end  NSH technology available.

- Stewart


Best,
R.


On Thu, Apr 12, 2018 at 5:04 PM, Stewart Bryant <stewart.bryant@gmail.com> wrote:

Rather than have a process discussion, I think we should go up a level and better understand the technical differences between the two drafts.

draft-farrel-mpls-sfc describes the actions at a hop in terms of a tuple that mirrors the SFC approach that allows a short indication of potentially re-entrant chains. In its simplest form it uses a compact MPLS stack to describe an arbitarily complex path that is compatile with simple edge routers which are often challenged in terms of the number of labels that they can push.

draft-xu-clad-spring-sr-service-chaining unrolls the path and explicitly calls out each hop and each function into the label stack. This results in a much larger MPLS label stack that will challenge some edge routers. The way that we generally deal with imposition limits is through the use of binding-SIDs, which in the limiting case resolves to the approach in draft-farrel with the limitation that the position on the path is implicit in the label stack size rather than explicitly specified by the SI.

Mid-flight path changes (if such things are needed) is clearly simpler with draft-farrel.

The short stack in draft-farrel comes at the cost of greater network forwarding stack, and the long stack is the price that draft-xu-clad pays for the reduction in forwarding state.

The optimal design point between forwarding and control plane state is something that is dependent on many parameters, and is dependent on many network and operational factors, so much so, that don't think it is wise to rule either out of scope at this stage.

The hybrid mode in section 6 of draft-farrel supports the mixed mode in section 7 of the draft. This allows the construction of SFCs that are the concatination of two or more compacted sub-chains. This allows the operator to deploy a solution with the advantages of draft-farrel together with some of the flexibility of draft-xu-clad.

At this stage the two drafts are sufficienly different that I think we need to proceed with both at least to the point where we fully understand the detailed consequences of the two approachs and the scenarios where each finds it's niche.

After developing a better understanding the detail of each design, their control plane, and operational contexts and how each maps to customer network requirements, we can move the drafts to the appropriate IETF track. Such tracks may be anything from abandonment to IETF standard for one or both of these approaches.

Meanwhile I think that we need to focus our efforts on a deeper understanding of the technology and how each might make the Internet work better,  rather than spending effort on arguing about IETF process.

- Stewart



--------------F1572980460347252AB494E4-- From nobody Thu Apr 12 09:18:12 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 83AD7127010; Thu, 12 Apr 2018 09:18:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.099 X-Spam-Level: X-Spam-Status: No, score=-2.099 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 gLKKQuq1wU74; Thu, 12 Apr 2018 09:18:09 -0700 (PDT) Received: from mail-wm0-x233.google.com (mail-wm0-x233.google.com [IPv6:2a00:1450:400c:c09::233]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DCCF71241F3; Thu, 12 Apr 2018 09:18:08 -0700 (PDT) Received: by mail-wm0-x233.google.com with SMTP id i3so10556405wmf.3; Thu, 12 Apr 2018 09:18:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc; bh=SkJp5ubALt9/y+9XxO3JWMDa3exX+4j0TZ+1mnwjWy8=; b=d/i3bl6uFI4mM3Ck5K/EHAhlGW/qQmcmLHmK2gQlGKnNAbq9cHcjjLEEo8swL1gh2R SGHQue0QyN2CWVoKh0HJ5y2rN+iipp5PK9ypEh4iY668kcWIgaFkfKG9Se0JHFewXE5w 6hKzb3YpbgEo1TCNlY/AyB6BqHLF4wMUuSXsJr9c5STaG6Rtbifefb/CPMJC0bp/QE3n OiiITnLcROHg42R8FMlujApT7OX1Q7o/x/9i8pskBt8O9sKensDZg2Duj26IhqEi2bKp zlRaa7yy/diA4hxmKzadq6ikS+t2zoudk+qQoCk1mwTboMTtPRbb0+cTL8dhpyKMiAj0 f36A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to:cc; bh=SkJp5ubALt9/y+9XxO3JWMDa3exX+4j0TZ+1mnwjWy8=; b=QLl+RplOb1zQZOfjc79GBFP5KvwLbWDsLDJ1gXbcto4HB4+PS/X0FSfD4nY1trZH/4 daDm6o3gjuL5M0b5UWJFomWVpFTxYu6NfDRJ/P/vxDpsA0A4fNv2fGBsKNQbVChJudOE V7pV0DUiFOqtPq7770OIcF4KIQDEwa6eRGo5izQP7veT2jhGAv7UILNz3iqjMhqbASPS KCyE18amW8ziuat0MGUMTqaN1vYUIqzZ9mTDQ/DM5juPenv6lcE12BRi8Bk84cZdPN1K 9bHlkIeHDiov6ijVlSBrp1OD8kD3OnDG/fpuaKvlEMegluwpWYyWMb9RMrOIQm97eLvX fOPg== X-Gm-Message-State: ALQs6tCYchic0ScZpAeETQM2U2JBND5AAqYvP5SV34kucII5dl1Y30m2 DdhoCA2fO8gox7MB8W6rtNFyCsLo1plfW+Vk8Fw= X-Google-Smtp-Source: AIpwx487Bdk/UGB0Lii3nOGDldKcH0EQ8wK1FBLDCnRZU0tWheFGgU8NsKFYvmYvffYyM8DxB4UorwuGVsXpRT690m4= X-Received: by 10.28.54.6 with SMTP id d6mr1192633wma.32.1523549887215; Thu, 12 Apr 2018 09:18:07 -0700 (PDT) MIME-Version: 1.0 Sender: rraszuk@gmail.com Received: by 10.28.222.197 with HTTP; Thu, 12 Apr 2018 09:18:06 -0700 (PDT) In-Reply-To: References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <1522554645079.8864@bell.ca> <1522812352107.5966@bell.ca> <489a9667-f159-4607-5834-b4bacf64989c@gmail.com> From: Robert Raszuk Date: Thu, 12 Apr 2018 18:18:06 +0200 X-Google-Sender-Auth: 8UfaHj6npJYNVStSJWlrsRpIb6M Message-ID: To: Stewart Bryant Cc: "mpls@ietf.org" , "sfc@ietf.org" Content-Type: multipart/alternative; boundary="001a11436a7ad33e8a0569a91996" Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 16:18:11 -0000 --001a11436a7ad33e8a0569a91996 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable > > NP memory state is enormously more expensive ($$$) than route processor > state. > =E2=80=8B100% agree. =E2=80=8B SR pushes that expensive state to the most cost sensitive components in the > network (the ingress routers). The payback is a reduction in path state i= n > the core. > =E2=80=8BSo to be practical let's face the question how many services will = be traversed ? 1 ? 2 ? 3 ? Is this so much to worry about as far as transport state is concerned in ingress node ? =E2=80=8BKeep in mind that with curren= t technology ingress may actually (and very often will be) the host not the router for SRH insertion (especially in v6 deployments). =E2=80=8BIn draft-ietf-mpls-sfc you may "win" the less state on the ingress= , but you loose big time as now SF need to know where to forward given packet further by properly setting the outermost transport label =E2=80=8Bafter N-= th SF processing. Clearly you need good control plane assist for it. IMO so much for big savings ... Opex complexity increases exponentially when you start to troubleshoot it. =E2=80=8B=E2=80=8B > If you have end to end NSH, then use it. Both of these drafts focus on > what to do if you do not have end to end NSH technology available. > =E2=80=8BIt would be very helpful to say so in this draft in bold :). =E2= =80=8B Anyhow worse things get standardized these days so consider this to be my last note on that one .... Cheers, R. --001a11436a7ad33e8a0569a91996 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
NP mem= ory state is enormously more expensive ($$$) than route processor state.

=E2=80=8B100% agree. =E2=80=8B

SR pushes = that expensive state to the most cost sensitive components in the network (the ingress routers). The payback is a reduction in path state in the core.

=E2=80=8BSo to be practical let's = face the question how many services will be traversed ? 1 ? 2 ? 3 ? Is this= so much to worry about as far as transport state is concerned in ingress n= ode ? =E2=80=8BKeep in mind that with current technology ingress may actual= ly (and very often will be) the host not the router for SRH insertion (espe= cially in v6 deployments).=C2=A0

=E2= =80=8BIn draft-ietf-mpls-sfc you may "win" the less state on the = ingress, but you loose big time as now SF need to know where to forward giv= en packet further by properly setting the outermost transport label =E2=80= =8Bafter N-th SF processing. Clearly you need good control plane assist for= it. IMO so much for big savings ... Opex complexity increases exponentiall= y when you start to troubleshoot it.=C2=A0
= =E2=80=8B=E2=80=8B
If you have end to end NSH, then use it. Both of thes= e drafts focus on what to do if you do not have end to end=C2=A0 NSH technology available.

=E2= =80=8BIt would be very helpful to say so in this draft in bold :). =E2=80= =8B

Anyhow worse thing= s get standardized these days so consider this to be my last note on that o= ne ....=C2=A0

Cheers,<= /div>
R.


--001a11436a7ad33e8a0569a91996-- From nobody Thu Apr 12 09:55:08 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1C7EE1270AB; Thu, 12 Apr 2018 09:54:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 oIfT11Yj2vOp; Thu, 12 Apr 2018 09:54:30 -0700 (PDT) Received: from mail-lf0-x22c.google.com (mail-lf0-x22c.google.com [IPv6:2a00:1450:4010:c07::22c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1619E124E15; Thu, 12 Apr 2018 09:54:30 -0700 (PDT) Received: by mail-lf0-x22c.google.com with SMTP id u3-v6so8720389lff.5; Thu, 12 Apr 2018 09:54:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=k24k4M4BHpZA/c74l7cDQMO/rTKBXFfqPRpNx1yzCUQ=; b=tWtJ1ZfukJCpoYskv9oNf5R3xN7/pSsX8q4M/HhWm3riePkkyOHrjQa0q/jyE5vzIY KhOSqNpHOeuLVNVy3PMp6cOYeE/SaLf5LTGUMDhVmPs/cQnHiBYXzgB84lY6tQTbiL4B k6T3RrUigp6rRf7ZiGojyKuimF9BaYgBsC8hHxO879tkHZOeWVNoQoDDCpUvDTHY6Wbm SLamHi4MaGEwuSZZHj/dTLdr8a6KCkAKClgastY89JebLXhPBrevUQFILMvddE9ZUuPf x9A+zS1VfbPlcpVeB/Ag8/Sc2diGPz/mPEvu9oRRfVAz6K+7UQTjFrsQZVuLZKg9A7Ek OS+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=k24k4M4BHpZA/c74l7cDQMO/rTKBXFfqPRpNx1yzCUQ=; b=cxWyx/gzIdXEKFyDXcBqZh+BbPzQ1OiDqewuIDHufFvdSZpfhOTiiH1KyDp7SWWd3v VAcpY4Ba6qsouk6SriHVPnN/xlVFZdd9p0c9waAHYeXv8TuvBbJxBUNCrIo9t9BkQlRV gZptJNln8CJPGhL51NPVzxbEMAIAmUZeFakyj/pveocM6xFVDaL/JFmXb3FiEoVop71c pB97Sl5Fr84WX10qXkKw9QGadt5Uxle3uP4K/PkYcxEJcMIqm6GwEJy3gJkiilOxxeB7 R6uVkDAtn6IciNZohKC/Ur6WzB+QxFX5Sv0NSkoKIYHqg+prqWtFVzuRVWbn87M6Zxw6 K4QQ== X-Gm-Message-State: ALQs6tABQK1GRcKMkz621IEQKKHsfLdL4tA1tyHERTczr4BvVanXw0eh eZb78/uM7z8LZ8DUlg7/7Fub3gVjGua/g7J3HqM= X-Google-Smtp-Source: AIpwx4/FCOSrYcu84vBL1IVCCWUKllA97NLUExVmMHQkoD1z7w8H6CWyF6MSmNJQwqMsVY38nA5Z8jwu3eRzSoow1E8= X-Received: by 2002:a19:3bc6:: with SMTP id d67-v6mr6210500lfl.100.1523552068123; Thu, 12 Apr 2018 09:54:28 -0700 (PDT) MIME-Version: 1.0 Received: by 10.46.73.66 with HTTP; Thu, 12 Apr 2018 09:54:27 -0700 (PDT) In-Reply-To: References: From: Greg Mirsky Date: Thu, 12 Apr 2018 18:54:27 +0200 Message-ID: To: "Frank Brockners (fbrockne)" Cc: IETF IPPM WG , NVO3 , Service Function Chaining IETF list , int-area@ietf.org Content-Type: multipart/alternative; boundary="000000000000d13f4a0569a99bad" Archived-At: Subject: Re: [sfc] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 16:54:33 -0000 --000000000000d13f4a0569a99bad Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Frank, thank you for sharing your points. Please find my notes in-line and tagged GIM>>. I believe that this is very much relevant to work of other working groups that directly work on the overlay encapsulations in the center of the discussion and hence I've added them to the list. Hope we'll have more opinions to reach the conclusion that is acceptable to all. Regards, Greg On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) < fbrockne@cisco.com> wrote: > Back at the IPPM meeting in London, we discussed several drafts dealing > with the encapsulation of IOAM data in various protocols > (draft-brockners-ippm-ioam-vxlan-gpe-00, draft-brockners-ippm-ioam-geneve= -00, > draft-weis-ippm-ioam-gre-00). One discussion topic that we decided to tak= e > to the list was the question on whether draft-ooamdt-rtgwg-ooam-header > could be leveraged. After carefully considering draft-ooamdt-rtgwg-ooam-= header, > I came to the conclusion that the =E2=80=9COOAM header=E2=80=9D does not = meet the needs of > IOAM: > > * Efficiency: IOAM adds data to live user traffic. As such, an > encapsulation needs to be as efficient as possible. The =E2=80=9COOAM hea= der=E2=80=9D is 8 > bytes long. The approach for IOAM data encapsulation in the above mention= ed > drafts only requires 4 bytes. Using the OOAM header approach would add an > unnecessary overhead of 4 bytes =E2=80=93 which is significant. > GIM>> The difference in four octets is because OOAM Header: - provides more flexibility, e.g. Flags field and Reserved fields; - supports larger OAM packets than iOAM header; - is future proof by supporting versioning (Version field). * Maturity: IOAM has several implementations, which were also shown at > recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting additional i= mplementations to > be publicized soon. Interoperable implementations need timely > specifications. Despite the question being asked, the recent thread on OO= AM > in the NVO3 list hasn=E2=80=99t revealed any implementation of the OOAM h= eader. In > addition, the thread revealed that several fundamental questions about th= e > OOAM header are still open, such as whether or how active OAM mechanisms > within protocols such as Geneve would apply to the OOAM header. This > ultimately means that we won=E2=80=99t get to a timely specification. > GIM>> May I ask which encapsulations supported by the implementations you refer to. Until very recently all iOAM proposals were to use meta-data TLV in, e.g. Geneve and NSH. And if these or some of these implementations already updated to the newly proposed iOAM shim, I don't see problem in making them use OOAM Header. Would you agree? > * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM head= er would > ultimately apply to. The way the OOAM header is defined, OOAM uses a 8-bi= t > field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protocols = that IOAM data > needs to be encapsulated into use 16-bits for their next protocol code > points. See e.g. the GRE encapsulation =E2=80=93 as specified in > draft-weis-ippm-ioam-gre-00. > GIM>> The first paragraph of the Introduction section states: New protocols that support overlay networks like VxLAN-GPE [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], and NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. Ethernet, IPv4/IPv6, and recognize Operations, Administration, and Maintenance (OAM) as one of distinct types. That ensures that Overlay OAM (OOAM)packets are sharing fate with Overlay data packet traversing the underlay. I'm updating the OOAM Header draft and along with cleaning nits will update reference to GUE. I think that the list and the statemnt are quite clear in identifying the scope of networks that may benefit from using not only common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply . With the above in mind, I=E2=80=99d suggest that the WG moves forward with = specific > definitions for encapsulating IOAM data into protocols =E2=80=93 per the = above > mentioned drafts. > > > > Regards, Frank > > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://www.ietf.org/mailman/listinfo/ippm > > --000000000000d13f4a0569a99bad Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Frank,
thank you for sharing your points. Please fi= nd my notes in-line and tagged GIM>>. I believe that this is very muc= h relevant to work of other working groups that directly work on the overla= y encapsulations in the center of the discussion and hence I've added t= hem to the list. Hope we'll have more opinions to reach the conclusion = that is acceptable to all.

Regards,
Greg=

On Wed, Apr= 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) <fbrockne@cisco.com= > wrote:

Back at the IPPM meeting in Lon= don, we discussed several drafts dealing with the encapsulation of IOAM dat= a in various protocols (draft-brockners-ippm-ioam-vxlan-gpe-00, draft-= brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). One discussion topic that we decided to take to the list was the question = on whether draft-ooamdt-rtgwg-ooam-header could be leveraged.=C2=A0 After c= arefully considering draft-ooamdt-rtgwg-ooam-header, I came to the con= clusion that the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM:

* Efficiency: IOAM adds data to= live user traffic. As such, an encapsulation needs to be as efficient as p= ossible. The =E2=80=9COOAM header=E2=80=9D is 8 bytes long. The approach fo= r IOAM data encapsulation in the above mentioned drafts only requires 4 bytes. Using the OOAM header approach would add an unneces= sary overhead of 4 bytes =E2=80=93 which is significant.

GIM>> The difference in four octets is because = OOAM Header:
  • provides more flexibility, e.g. Flags field = and Reserved fields;
  • supports larger OAM packets than iOAM header;<= /li>
  • is future proof by supporting versioning (Version field).
    • <= /ul>

* Maturity: IOAM has several im= plementations, which were also shown at recent IETF hackathons =E2=80=93 an= d we=E2=80=99re expecting additional implementations to be publicized soon.= Interoperable implementations need timely specifications. Despite the question being asked, the recent thread on OOAM in the NVO3 li= st hasn=E2=80=99t revealed any implementation of the OOAM header. In additi= on, the thread revealed that several fundamental questions about the OOAM h= eader are still open, such as whether or how active OAM mechanisms within protocols such as Geneve would apply to t= he OOAM header. This ultimately means that we won=E2=80=99t get to a timely= specification.

GIM>> May I a= sk which encapsulations supported by the implementations you refer to. Unti= l very recently all iOAM proposals were to use meta-data TLV in, e.g. Genev= e and NSH. And if these or some of these implementations already updated to= the newly proposed iOAM shim, I don't see problem in making them use O= OAM Header. Would you agree?
=C2=A0

<= u>

* Scope: It isn=E2=80=99t entir= ely clear to which protocols the OOAM header would ultimately apply to. The= way the OOAM header is defined, OOAM uses a 8-bit field for =E2=80=9CNext = Prot=E2=80=9D, the next protocol. Some protocols that IOAM data needs to be encapsulated into use 16-bits for their next protocol code poi= nts. See e.g. the GRE encapsulation =E2=80=93 as specified in draft-weis-ip= pm-ioam-gre-00.

GIM>> The fir= st paragraph of the Introduction section states:
=C2=A0 =C2=A0New= protocols that support overlay networks like VxLAN-GPE
=C2=A0 = =C2=A0[I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve
= =C2=A0 =C2=A0[I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation= ], and
=C2=A0 =C2=A0NSH [I-D.ietf-sfc-nsh] support multi-protocol= payload, e.g.
=C2=A0 =C2=A0Ethernet, IPv4/IPv6, and recognize Op= erations, Administration, and
=C2=A0 =C2=A0Maintenance (OAM) as o= ne of distinct types.=C2=A0 That ensures that
=C2=A0 =C2=A0Overla= y OAM (OOAM)packets are sharing fate with Overlay data packet
=C2= =A0 =C2=A0traversing the underlay.=C2=A0
I'm updating the OOA= M Header draft and along with cleaning nits will update reference to GUE. I= think that the list and the statemnt are quite clear in identifying the sc= ope of networks that may benefit from using not only common OOAM Header but= common OOAM mechanisms, e.g. Echo Request/Reply.

<= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex">

With the above in mind, I=E2=80= =99d suggest that the WG moves forward with specific definitions for encaps= ulating IOAM data into protocols =E2=80=93 per the above mentioned drafts.<= u>

=C2=A0

Regards, Frank


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-0500 From: "Frank Brockners (fbrockne)" To: Greg Mirsky CC: IETF IPPM WG , NVO3 , "Service Function Chaining IETF list" , "int-area@ietf.org" Thread-Topic: [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AdPRe/DslDwu34XkSmq8g6ttV3Kt0QBLOKqAAAir4cA= Date: Thu, 12 Apr 2018 18:06:21 +0000 Message-ID: References: In-Reply-To: Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.55.117.7] Content-Type: multipart/alternative; boundary="_000_f48b40357e644666bdd5c51c63118f80XCHRCD008ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 18:06:31 -0000 --_000_f48b40357e644666bdd5c51c63118f80XCHRCD008ciscocom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgR3JlZywNCg0KdGhhbmtzIOKAkyBhbmQgaXQgc2VlbXMgdGhhdCB3ZeKAmXJlIG9uIHRoZSBz YW1lIHBhZ2Ugd2l0aCByZWdhcmRzIHRvIGVmZmljaWVuY3kgKDQgYnl0ZXMgb2Ygbm9uLXJlcXVp cmVkIG92ZXJoZWFkKSBhbmQgbWF0dXJpdHkgKG9yIGxhY2sgb2YpIG9mIE9PQU0uDQoNCk9uIHRo ZSBJT0FNIGltcGxlbWVudGF0aW9uOiBUaGVyZSBhcmUgc2V2ZXJhbCBpbXBsZW1lbnRhdGlvbnMg b2YgSU9BTS4gU29tZSBvZiB3aGljaCBoYXZlIHJlY2VudGx5IGJlZW4gd29ya2VkIG9uIGFuZCBz aG93biBhdCBhbiBJRVRGIGhhY2thdGhvbiwgc2VlIGh0dHBzOi8vZGF0YXRyYWNrZXIuaWV0Zi5v cmcvbWVldGluZy8xMDAvbWF0ZXJpYWxzL3NsaWRlcy0xMDAtaGFja2F0aG9uLXNlc3NhLWluLXNp dHUtb2FtLWlvYW0gLSB3aGVyZSB3ZeKAmXZlIHNob3duIElQdjYgYW5kIFZYTEFOLUdQRSB3aXRo IElPQU0g4oCTIG9uIEZELmlvL1ZQUCBhcyB3ZWxsIGFzIG9uIEJhcmVmb290IFRvZmluby4gWW91 IHByb2JhYmx5IGFsc28gcmVtZW1iZXIgdGhlIE5ldHJvbm9tZS9Ccm9hZGNvbSBkZW1vIC0gaHR0 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sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D530312DA12 for ; Thu, 12 Apr 2018 11:37:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.909 X-Spam-Level: X-Spam-Status: No, score=-1.909 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_DKIMWL_WL_MED=-0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=herbertland-com.20150623.gappssmtp.com 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 m6ZfGCJEfjYz for ; Thu, 12 Apr 2018 11:37:45 -0700 (PDT) Received: from mail-yb0-x232.google.com (mail-yb0-x232.google.com [IPv6:2607:f8b0:4002:c09::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4E61612DA0D for ; Thu, 12 Apr 2018 11:37:45 -0700 (PDT) Received: by mail-yb0-x232.google.com with SMTP id b14-v6so2313988ybk.1 for ; Thu, 12 Apr 2018 11:37:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=herbertland-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=INZTQzC1xzDASuze/6YugFWtEwx99thcHTtHmq8n2O4=; b=aykm0/dtI4pvnyQCHomfqHbdOBqBCIFFeHEiE6bdhrJAsxPwb9TrONSZ2xJA9v5qIG xhNLoPiZt28iiYiQvqR9HnzotwR/O/mU6iVslYe0a7j1Xr1wc4HQoyQC365O1WJ+kT05 B0Vighha+Ncy2eRwlm+kpcvKd4pirbUsf/XEC5JLs+lQjEDiVCjQ/OCrfnb1jpQK/zOz MPY0CKMHbuZ7zphZqLgEiGVYkWkIJXzc2DtJvD35FnHimz7qPZCrulg8tzsVD30XP4mp 2MOY785ewS5TwqyqE9RgM6sHOvhiztqF/37PwaEQ9h0Ohvo87AoEDldaW1CocP6Wiv5E e8Nw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=INZTQzC1xzDASuze/6YugFWtEwx99thcHTtHmq8n2O4=; b=Gv8SxGG036pyAPzXO11q5cmF9jK3J84Y5mDgo5VAsXwP2UkXgVAyuytMMN5uTc9Nh6 4hUigLskKegmXB3GUHgAT59/+X6p9ph8LBXed9kCWcoasiNyVd3SaCegHFBrfWPd6cj2 c61TE9wCRXukXPQg4vXhO1dru2U92U47WWE0yOhtQMvzIsGgwIV9zrA+FdzEFqP/vXFK JmCKC0YWbenz931/uq1yrqCVgYkb9yCk+QwbznA3foH4mRuFIHO8arLcw5+p5oWIjV7F z2U27AbelfDN5Rg1viKDgvxk3j/x09sCAT46o5+NlXuS5tFTIiRKcDASg3UCeP6xKpKm KbOQ== X-Gm-Message-State: ALQs6tCMXVous/1SgP0BOzbvhnTIamOsOk10ExoyvlkD5BMKotE/b8kT U0lPxFsUi3D1kr+ll9Xe3plJDMiswe4ONIlU0Qyj9Q== X-Google-Smtp-Source: AIpwx4/MhiO3y898O3YD6L30UERaCfummYO8bwGiQaDE7qtT8v4H96uc9k/tp3Ot7YfhOs80Y8h64b40JrtcpiCYbis= X-Received: by 2002:a25:2144:: with SMTP id h65-v6mr1249686ybh.407.1523558264172; Thu, 12 Apr 2018 11:37:44 -0700 (PDT) MIME-Version: 1.0 Received: by 10.200.26.135 with HTTP; Thu, 12 Apr 2018 11:37:43 -0700 (PDT) In-Reply-To: References: From: Tom Herbert Date: Thu, 12 Apr 2018 11:37:43 -0700 Message-ID: To: Greg Mirsky Cc: "Frank Brockners (fbrockne)" , NVO3 , int-area@ietf.org, Service Function Chaining IETF list , IETF IPPM WG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [sfc] [Int-area] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 18:37:48 -0000 On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky wrote: > Hi Frank, > thank you for sharing your points. Please find my notes in-line and tagge= d > GIM>>. I believe that this is very much relevant to work of other working > groups that directly work on the overlay encapsulations in the center of = the > discussion and hence I've added them to the list. Hope we'll have more > opinions to reach the conclusion that is acceptable to all. > > Regards, > Greg > > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) > wrote: >> >> Back at the IPPM meeting in London, we discussed several drafts dealing >> with the encapsulation of IOAM data in various protocols >> (draft-brockners-ippm-ioam-vxlan-gpe-00, >> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). One >> discussion topic that we decided to take to the list was the question on >> whether draft-ooamdt-rtgwg-ooam-header could be leveraged. After carefu= lly >> considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusion tha= t >> the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM: >> >> * Efficiency: IOAM adds data to live user traffic. As such, an >> encapsulation needs to be as efficient as possible. The =E2=80=9COOAM he= ader=E2=80=9D is 8 >> bytes long. The approach for IOAM data encapsulation in the above mentio= ned >> drafts only requires 4 bytes. Using the OOAM header approach would add a= n >> unnecessary overhead of 4 bytes =E2=80=93 which is significant. > What is the relationship between this proposal and draft-fioccola-v6ops-ipv6-alt-mark which is currently searching for a way to squeeze out two bits in the IP header for performance measurement? Tom > GIM>> The difference in four octets is because OOAM Header: > > provides more flexibility, e.g. Flags field and Reserved fields; > supports larger OAM packets than iOAM header; > is future proof by supporting versioning (Version field). >> >> * Maturity: IOAM has several implementations, which were also shown at >> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting additional = implementations to >> be publicized soon. Interoperable implementations need timely >> specifications. Despite the question being asked, the recent thread on O= OAM >> in the NVO3 list hasn=E2=80=99t revealed any implementation of the OOAM = header. In >> addition, the thread revealed that several fundamental questions about t= he >> OOAM header are still open, such as whether or how active OAM mechanisms >> within protocols such as Geneve would apply to the OOAM header. This >> ultimately means that we won=E2=80=99t get to a timely specification. > > GIM>> May I ask which encapsulations supported by the implementations you > refer to. Until very recently all iOAM proposals were to use meta-data TL= V > in, e.g. Geneve and NSH. And if these or some of these implementations > already updated to the newly proposed iOAM shim, I don't see problem in > making them use OOAM Header. Would you agree? > >> >> * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM hea= der would >> ultimately apply to. The way the OOAM header is defined, OOAM uses a 8-b= it >> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protocols= that IOAM data >> needs to be encapsulated into use 16-bits for their next protocol code >> points. See e.g. the GRE encapsulation =E2=80=93 as specified in >> draft-weis-ippm-ioam-gre-00. > > GIM>> The first paragraph of the Introduction section states: > New protocols that support overlay networks like VxLAN-GPE > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve > [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], and > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. > Ethernet, IPv4/IPv6, and recognize Operations, Administration, and > Maintenance (OAM) as one of distinct types. That ensures that > Overlay OAM (OOAM)packets are sharing fate with Overlay data packet > traversing the underlay. > I'm updating the OOAM Header draft and along with cleaning nits will upda= te > reference to GUE. I think that the list and the statemnt are quite clear = in > identifying the scope of networks that may benefit from using not only > common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply. > >> With the above in mind, I=E2=80=99d suggest that the WG moves forward wi= th >> specific definitions for encapsulating IOAM data into protocols =E2=80= =93 per the >> above mentioned drafts. >> >> >> >> Regards, Frank >> >> >> _______________________________________________ >> ippm mailing list >> ippm@ietf.org >> https://www.ietf.org/mailman/listinfo/ippm >> > > > _______________________________________________ > Int-area mailing list > Int-area@ietf.org > https://www.ietf.org/mailman/listinfo/int-area > From nobody Thu Apr 12 14:29:17 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 668AF1270AC; Thu, 12 Apr 2018 14:28:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 zCG-v7ChYkwg; Thu, 12 Apr 2018 14:28:34 -0700 (PDT) Received: from mail-lf0-x22c.google.com (mail-lf0-x22c.google.com [IPv6:2a00:1450:4010:c07::22c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 062B1124217; Thu, 12 Apr 2018 14:28:34 -0700 (PDT) Received: by mail-lf0-x22c.google.com with SMTP id e5-v6so9755058lfb.7; Thu, 12 Apr 2018 14:28:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=PS3A6zEj5XY5k1H353peZiTJ64SsToibN0BwKazwbRc=; b=kcfiIkpWuFQQhHZ2PW5looGv4u3l00VWh9/TSfLDTazHypCR2Hj3A/SFEB/fjk0Isi WQvDrFlOXIiDtV4S1HK2Mcl0s4N9dqK3fdsU/npNBkTl8MoqhtA2fwFt7I9OPtDomIFq 8wEPdtBVZHF9EK933YVpvVjobVT7kmQ9qJHHmwp7M/li2urbxfAqTeUZ0ZGwQK26TQta 6DnV4Y2WOl0hSU8BgGraso9GnUo/T5ThysWvsO6G4YQAVs4S0dM50bF6/LvbVP51FIl0 AnagZ4qJldLZCvM1XkZHVmRbIDEUPUYRhjwONHRYY0q2qPiFg70eullunCkO9Z60rcYf c7AA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=PS3A6zEj5XY5k1H353peZiTJ64SsToibN0BwKazwbRc=; b=sAwuCTxd39ofk7MW/Ef8JgIkQJMv6me+boy/IgnLx48uDnoyxtFTuusFdQFe6xwCE+ x11i/6K/dyY06yCj67nJCvkFYFBDteHnCkNtlwTAapUcj8KznjnZF3t5Avby4A6WUgh9 Z5ubGhhTdTb/mDvb8T//68U35UQfC/dfJXo8DsilqvTAZtXCr02I0kfFsK/z7qWFO7VC roG3MLViRgFTMtW9fc5IqHrLH9eyIG0gES3ZC2lliN2f51WC8mLEkcsWBGNNuos12nrq NRRBwZb4zd7cwNeNXR6cmXj8Nb6yKzB5oKW4alsDBDVUMMORnwNwCNuCcfAy0Qfn8uNV FNJw== X-Gm-Message-State: ALQs6tAEEQePsIhTgZazOEUMcFTHtZ0UtE/F6yCzHVGafHk2jEvMO5xZ eparuJQWxVc/maK6ARYGLlIvLqHjPeZZfnHanYc= X-Google-Smtp-Source: AIpwx4/78vydyNkb+iEjItQU+dp8OFgz0ulpMppHd7XubqEscrSiwlbc3D4dgQHkqfhETah1yv/Vj9Z53PTdzI844VU= X-Received: by 10.46.32.154 with SMTP id g26mr1628474lji.71.1523568511913; Thu, 12 Apr 2018 14:28:31 -0700 (PDT) MIME-Version: 1.0 Received: by 10.46.73.66 with HTTP; Thu, 12 Apr 2018 14:28:31 -0700 (PDT) In-Reply-To: References: From: Greg Mirsky Date: Thu, 12 Apr 2018 23:28:31 +0200 Message-ID: To: Tom Herbert Cc: "Frank Brockners (fbrockne)" , NVO3 , int-area@ietf.org, Service Function Chaining IETF list , IETF IPPM WG Content-Type: multipart/alternative; boundary="001a1143062af192f60569ad6f1d" Archived-At: Subject: Re: [sfc] [Int-area] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 21:28:43 -0000 --001a1143062af192f60569ad6f1d Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Tom, I think you refer to the proposal on how to apply RFC 8321 in IPv6 networks. Using two bits-long field for Alternate Marking is just one option as you can find in the draft on compact Alt.marking . But to answer your question, there's no connection or dependency between the Alternate Marking method and OOAM. Will note that we have documents on the applicability of the Alternate Marking method in BIER, SFC NSH, and Geneve. Regards, Greg On Thu, Apr 12, 2018 at 8:37 PM, Tom Herbert wrote: > On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky > wrote: > > Hi Frank, > > thank you for sharing your points. Please find my notes in-line and > tagged > > GIM>>. I believe that this is very much relevant to work of other worki= ng > > groups that directly work on the overlay encapsulations in the center o= f > the > > discussion and hence I've added them to the list. Hope we'll have more > > opinions to reach the conclusion that is acceptable to all. > > > > Regards, > > Greg > > > > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) > > wrote: > >> > >> Back at the IPPM meeting in London, we discussed several drafts dealin= g > >> with the encapsulation of IOAM data in various protocols > >> (draft-brockners-ippm-ioam-vxlan-gpe-00, > >> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). One > >> discussion topic that we decided to take to the list was the question = on > >> whether draft-ooamdt-rtgwg-ooam-header could be leveraged. After > carefully > >> considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusion > that > >> the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM: > >> > >> * Efficiency: IOAM adds data to live user traffic. As such, an > >> encapsulation needs to be as efficient as possible. The =E2=80=9COOAM = header=E2=80=9D > is 8 > >> bytes long. The approach for IOAM data encapsulation in the above > mentioned > >> drafts only requires 4 bytes. Using the OOAM header approach would add > an > >> unnecessary overhead of 4 bytes =E2=80=93 which is significant. > > > > What is the relationship between this proposal and > draft-fioccola-v6ops-ipv6-alt-mark which is currently searching for a > way to squeeze out two bits in the IP header for performance > measurement? > > Tom > > > GIM>> The difference in four octets is because OOAM Header: > > > > provides more flexibility, e.g. Flags field and Reserved fields; > > supports larger OAM packets than iOAM header; > > is future proof by supporting versioning (Version field). > >> > >> * Maturity: IOAM has several implementations, which were also shown at > >> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting additiona= l implementations > to > >> be publicized soon. Interoperable implementations need timely > >> specifications. Despite the question being asked, the recent thread on > OOAM > >> in the NVO3 list hasn=E2=80=99t revealed any implementation of the OOA= M header. > In > >> addition, the thread revealed that several fundamental questions about > the > >> OOAM header are still open, such as whether or how active OAM mechanis= ms > >> within protocols such as Geneve would apply to the OOAM header. This > >> ultimately means that we won=E2=80=99t get to a timely specification. > > > > GIM>> May I ask which encapsulations supported by the implementations y= ou > > refer to. Until very recently all iOAM proposals were to use meta-data > TLV > > in, e.g. Geneve and NSH. And if these or some of these implementations > > already updated to the newly proposed iOAM shim, I don't see problem in > > making them use OOAM Header. Would you agree? > > > >> > >> * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM h= eader > would > >> ultimately apply to. The way the OOAM header is defined, OOAM uses a > 8-bit > >> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protoco= ls that IOAM data > >> needs to be encapsulated into use 16-bits for their next protocol code > >> points. See e.g. the GRE encapsulation =E2=80=93 as specified in > >> draft-weis-ippm-ioam-gre-00. > > > > GIM>> The first paragraph of the Introduction section states: > > New protocols that support overlay networks like VxLAN-GPE > > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve > > [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], and > > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. > > Ethernet, IPv4/IPv6, and recognize Operations, Administration, and > > Maintenance (OAM) as one of distinct types. That ensures that > > Overlay OAM (OOAM)packets are sharing fate with Overlay data packet > > traversing the underlay. > > I'm updating the OOAM Header draft and along with cleaning nits will > update > > reference to GUE. I think that the list and the statemnt are quite clea= r > in > > identifying the scope of networks that may benefit from using not only > > common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply. > > > >> With the above in mind, I=E2=80=99d suggest that the WG moves forward = with > >> specific definitions for encapsulating IOAM data into protocols =E2=80= =93 per > the > >> above mentioned drafts. > >> > >> > >> > >> Regards, Frank > >> > >> > >> _______________________________________________ > >> ippm mailing list > >> ippm@ietf.org > >> https://www.ietf.org/mailman/listinfo/ippm > >> > > > > > > _______________________________________________ > > Int-area mailing list > > Int-area@ietf.org > > https://www.ietf.org/mailman/listinfo/int-area > > > --001a1143062af192f60569ad6f1d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Tom,
I think you refer to the proposal on how to ap= ply RFC 8321=C2=A0in IP= v6 networks. Using two bits-long field for Alternate Marking is just one op= tion as you can find in the draft on compact Alt.marking. = But to answer your question, there's no connection or dependency betwee= n the Alternate Marking method and OOAM. Will note that we have documents o= n the applicability of the Alternate Marking method in BIER, SFC NSH, and G= eneve.

Regards,
Greg

On Thu, Apr 12, 2018 at 8= :37 PM, Tom Herbert <tom@herbertland.com> wrote:
On Thu, Apr 12, 2018 at 9:54 AM, = Greg Mirsky <gregimirsky@gmail.= com> wrote:
> Hi Frank,
> thank you for sharing your points. Please find my notes in-line and ta= gged
> GIM>>. I believe that this is very much relevant to work of othe= r working
> groups that directly work on the overlay encapsulations in the center = of the
> discussion and hence I've added them to the list. Hope we'll h= ave more
> opinions to reach the conclusion that is acceptable to all.
>
> Regards,
> Greg
>
> On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne)
> <fbrockne@cisco.com> w= rote:
>>
>> Back at the IPPM meeting in London, we discussed several drafts de= aling
>> with the encapsulation of IOAM data in various protocols
>> (draft-brockners-ippm-ioam-vxlan-gpe-00,
>> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre= -00). One
>> discussion topic that we decided to take to the list was the quest= ion on
>> whether draft-ooamdt-rtgwg-ooam-header could be leveraged.=C2=A0 A= fter carefully
>> considering draft-ooamdt-rtgwg-ooam-header, I came to the con= clusion that
>> the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM:=
>>
>> * Efficiency: IOAM adds data to live user traffic. As such, an
>> encapsulation needs to be as efficient as possible. The =E2=80=9CO= OAM header=E2=80=9D is 8
>> bytes long. The approach for IOAM data encapsulation in the above = mentioned
>> drafts only requires 4 bytes. Using the OOAM header approach would= add an
>> unnecessary overhead of 4 bytes =E2=80=93 which is significant. >

What is the relationship between this proposal and
draft-fioccola-v6ops-ipv6-alt-mark which is currently searching for a<= br> way to squeeze out two bits in the IP header for performance
measurement?

Tom

> GIM>> The difference in four octets is because OOAM Header:
>
> provides more flexibility, e.g. Flags field and Reserved fields;
> supports larger OAM packets than iOAM header;
> is future proof by supporting versioning (Version field).
>>
>> * Maturity: IOAM has several implementations, which were also show= n at
>> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting addit= ional implementations to
>> be publicized soon. Interoperable implementations need timely
>> specifications. Despite the question being asked, the recent threa= d on OOAM
>> in the NVO3 list hasn=E2=80=99t revealed any implementation of the= OOAM header. In
>> addition, the thread revealed that several fundamental questions a= bout the
>> OOAM header are still open, such as whether or how active OAM mech= anisms
>> within protocols such as Geneve would apply to the OOAM header. Th= is
>> ultimately means that we won=E2=80=99t get to a timely specificati= on.
>
> GIM>> May I ask which encapsulations supported by the implementa= tions you
> refer to. Until very recently all iOAM proposals were to use meta-data= TLV
> in, e.g. Geneve and NSH. And if these or some of these implementations=
> already updated to the newly proposed iOAM shim, I don't see probl= em in
> making them use OOAM Header. Would you agree?
>
>>
>> * Scope: It isn=E2=80=99t entirely clear to which protocols the OO= AM header would
>> ultimately apply to. The way the OOAM header is defined, OOAM uses= a 8-bit
>> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some pro= tocols that IOAM data
>> needs to be encapsulated into use 16-bits for their next protocol = code
>> points. See e.g. the GRE encapsulation =E2=80=93 as specified in >> draft-weis-ippm-ioam-gre-00.
>
> GIM>> The first paragraph of the Introduction section states: >=C2=A0 =C2=A0 New protocols that support overlay networks like VxLAN-GP= E
>=C2=A0 =C2=A0 [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Genev= e
>=C2=A0 =C2=A0 [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-enc= apsulation], and
>=C2=A0 =C2=A0 NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.= g.
>=C2=A0 =C2=A0 Ethernet, IPv4/IPv6, and recognize Operations, Administra= tion, and
>=C2=A0 =C2=A0 Maintenance (OAM) as one of distinct types.=C2=A0 That en= sures that
>=C2=A0 =C2=A0 Overlay OAM (OOAM)packets are sharing fate with Overlay d= ata packet
>=C2=A0 =C2=A0 traversing the underlay.
> I'm updating the OOAM Header draft and along with cleaning nits wi= ll update
> reference to GUE. I think that the list and the statemnt are quite cle= ar in
> identifying the scope of networks that may benefit from using not only=
> common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply= .
>
>> With the above in mind, I=E2=80=99d suggest that the WG moves forw= ard with
>> specific definitions for encapsulating IOAM data into protocols = =E2=80=93 per the
>> above mentioned drafts.
>>
>>
>>
>> Regards, Frank
>>
>>
>> _______________________________________________
>> ippm mailing list
>> ippm@ietf.org
>> https://www.ietf.org/mailman/listinfo/ippm
>>
>
>
> _______________________________________________
> Int-area mailing list
> Int-area@ietf.org
> https://www.ietf.org/mailman/listinfo/int-ar= ea
>

--001a1143062af192f60569ad6f1d-- From nobody Thu Apr 12 14:35:58 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3BB3D1270AC; Thu, 12 Apr 2018 14:35:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 39GKhOzoEjGD; Thu, 12 Apr 2018 14:35:23 -0700 (PDT) Received: from mail-lf0-x236.google.com (mail-lf0-x236.google.com [IPv6:2a00:1450:4010:c07::236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A3381124217; Thu, 12 Apr 2018 14:35:22 -0700 (PDT) Received: by mail-lf0-x236.google.com with SMTP id e5-v6so9775199lfb.7; Thu, 12 Apr 2018 14:35:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=pGPmi1Sxf/tblpKV7sG3a4RmHhIHvLS3P+5KWSIOoKo=; b=HimWTQf2TshKzRg8V1yjbUHyPi4mpNJgpI3Pcf9QOlxQR/nubUScc8nzLiNZYva6T+ VFjpa99djDGWYVDvm4Ss2e7QallRxC8nHOF3OhCisFYfDUpzV0aTYS5S2jtqQ3ntO8tM glIy8b7C6Tb2H0SYklhwhJi8/w6f9S5PayQWgpfCjmNIW6EAg7rPDpSPfWy3kiH5Qadv UEoO2qHEcbGfBQDtCaPVodTFpd6B/5aepRx74+vkXVvcrKe0SgQLG8woqu4Fmgj4LvzO 3M5kubLe7KQzGjEUSLVX6Mt7HQzUa2BRt/dqIi0VvV4Ps8kK7cpWZqbnf0+W8jbCJ4Qb jYbA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=pGPmi1Sxf/tblpKV7sG3a4RmHhIHvLS3P+5KWSIOoKo=; b=m1EkPBmzBcjSIfrBWq2PYStlKt9U7LHHFfqH504w0ykDBhyCi9yK/nKaL3JOf62rv0 PapfAue31p3826R3rHd+94iQFTQ9sBQhlzc7kUEmquYZGW9enBeQJhHaAg9FGVxagyCA qmYu0sFZPf1BcPuSlDj7Wk1oI983P3E/RX0v/SyxY/TvNJYXtOIQXD/XHD2EacEMf0t/ tWHFcM/J/A4v6VLx/X+KJRDGB8q1Htt3vlRVUxRswbSSXhI8BxVe6xYmk6879oQaiADA qLjA5+dlF6zXtwkP10BQupNg4tUCu3Mc9RXPnpk69dRukeeL7ZhiRy+RSDKysS87x5Nl PH3w== X-Gm-Message-State: ALQs6tAzfR/iztbwRRA8lG56gyqsaag3zK3oxZKJ260ULOI8SlpfUJJ/ bH+nFDp2uPM4L2g7FrnaBTWTl8mbkS7RY4Oyha0= X-Google-Smtp-Source: AIpwx490OFSEUM66du7whVK6SUkwEYOKrn2VlWX+RGm3Fvkenhl9MfA6pGvwllq02FM2ewh66FyxKXQduuRPZqfm52w= X-Received: by 10.46.156.132 with SMTP id x4mr1628273lji.19.1523568920822; Thu, 12 Apr 2018 14:35:20 -0700 (PDT) MIME-Version: 1.0 Received: by 10.46.73.66 with HTTP; Thu, 12 Apr 2018 14:35:20 -0700 (PDT) In-Reply-To: References: From: Greg Mirsky Date: Thu, 12 Apr 2018 23:35:20 +0200 Message-ID: To: "Frank Brockners (fbrockne)" Cc: IETF IPPM WG , NVO3 , Service Function Chaining IETF list , "int-area@ietf.org" Content-Type: multipart/alternative; boundary="883d24f22754510a1e0569ad88cd" Archived-At: Subject: Re: [sfc] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 21:35:26 -0000 --883d24f22754510a1e0569ad88cd Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Frank, I think you've misunderstood my response to your statements: - the scope of OOAM, contrary to what you've stated, is clearly stated in the draft; - what you present as "efficiency" I consider to be serious limitations (lack of versioning, limited size for data, and no future extension) tha= t should be explained and thoroughly discussed by the WGs that develop corresponding overlay networks before IPPM WG makes any decision. Regards, Greg On Thu, Apr 12, 2018 at 8:06 PM, Frank Brockners (fbrockne) < fbrockne@cisco.com> wrote: > Hi Greg, > > > > thanks =E2=80=93 and it seems that we=E2=80=99re on the same page with re= gards to > efficiency (4 bytes of non-required overhead) and maturity (or lack of) o= f > OOAM. > > > > On the IOAM implementation: There are several implementations of IOAM. > Some of which have recently been worked on and shown at an IETF hackathon= , > see https://datatracker.ietf.org/meeting/100/materials/slides- > 100-hackathon-sessa-in-situ-oam-ioam - where we=E2=80=99ve shown IPv6 and > VXLAN-GPE with IOAM =E2=80=93 on FD.io/VPP as well as on Barefoot Tofino.= You > probably also remember the Netronome/Broadcom demo - > https://www.youtube.com/watch?v=3Dj9FbD4a3F4E . > > Below you seem to be specifically referring to the IOAM open source > implementation in FD.io/VPP: There are protocol encapsulations for > VXLAN-GPE, NSH, and IPv6 implemented in FD.io/VPP. The current code uses > the =E2=80=9Cnext header approach=E2=80=9D for VXLAN-GPE and it leverages= MD-Type 2 for > NSH. As you=E2=80=99re well aware, there the discussion in SFC whether to= use > MD-Type 2 or next header encapsulating IOAM data in NSH isn=E2=80=99t yet= settled, > hence we=E2=80=99ll refrain from updating the code until SFC WG has come = to a > conclusion. > > > > Could you provide a pointer to an OOAM implementation? > > > > Thanks, > > Frank > > > > *From:* Greg Mirsky > *Sent:* Donnerstag, 12. April 2018 18:54 > *To:* Frank Brockners (fbrockne) > *Cc:* IETF IPPM WG ; NVO3 ; Service > Function Chaining IETF list ; int-area@ietf.org > *Subject:* Re: [ippm] encapsulation of IOAM data in various protocols - > follow up from WG discussion in London > > > > Hi Frank, > > thank you for sharing your points. Please find my notes in-line and tagge= d > GIM>>. I believe that this is very much relevant to work of other working > groups that directly work on the overlay encapsulations in the center of > the discussion and hence I've added them to the list. Hope we'll have mor= e > opinions to reach the conclusion that is acceptable to all. > > > > Regards, > > Greg > > > > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) < > fbrockne@cisco.com> wrote: > > Back at the IPPM meeting in London, we discussed several drafts dealing > with the encapsulation of IOAM data in various protocols > (draft-brockners-ippm-ioam-vxlan-gpe-00, draft-brockners-ippm-ioam-geneve= -00, > draft-weis-ippm-ioam-gre-00). One discussion topic that we decided to tak= e > to the list was the question on whether draft-ooamdt-rtgwg-ooam-header > could be leveraged. After carefully considering draft-ooamdt-rtgwg-ooam-= header, > I came to the conclusion that the =E2=80=9COOAM header=E2=80=9D does not = meet the needs of > IOAM: > > * Efficiency: IOAM adds data to live user traffic. As such, an > encapsulation needs to be as efficient as possible. The =E2=80=9COOAM hea= der=E2=80=9D is 8 > bytes long. The approach for IOAM data encapsulation in the above mention= ed > drafts only requires 4 bytes. Using the OOAM header approach would add an > unnecessary overhead of 4 bytes =E2=80=93 which is significant. > > GIM>> The difference in four octets is because OOAM Header: > > - provides more flexibility, e.g. Flags field and Reserved fields; > - supports larger OAM packets than iOAM header; > - is future proof by supporting versioning (Version field). > > * Maturity: IOAM has several implementations, which were also shown at > recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting additional i= mplementations to > be publicized soon. Interoperable implementations need timely > specifications. Despite the question being asked, the recent thread on OO= AM > in the NVO3 list hasn=E2=80=99t revealed any implementation of the OOAM h= eader. In > addition, the thread revealed that several fundamental questions about th= e > OOAM header are still open, such as whether or how active OAM mechanisms > within protocols such as Geneve would apply to the OOAM header. This > ultimately means that we won=E2=80=99t get to a timely specification. > > GIM>> May I ask which encapsulations supported by the implementations you > refer to. Until very recently all iOAM proposals were to use meta-data TL= V > in, e.g. Geneve and NSH. And if these or some of these implementations > already updated to the newly proposed iOAM shim, I don't see problem in > making them use OOAM Header. Would you agree? > > > > * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM head= er would > ultimately apply to. The way the OOAM header is defined, OOAM uses a 8-bi= t > field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protocols = that IOAM data > needs to be encapsulated into use 16-bits for their next protocol code > points. See e.g. the GRE encapsulation =E2=80=93 as specified in > draft-weis-ippm-ioam-gre-00. > > GIM>> The first paragraph of the Introduction section states: > > New protocols that support overlay networks like VxLAN-GPE > > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve > > [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], and > > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. > > Ethernet, IPv4/IPv6, and recognize Operations, Administration, and > > Maintenance (OAM) as one of distinct types. That ensures that > > Overlay OAM (OOAM)packets are sharing fate with Overlay data packet > > traversing the underlay. > > I'm updating the OOAM Header draft and along with cleaning nits will > update reference to GUE. I think that the list and the statemnt are quite > clear in identifying the scope of networks that may benefit from using no= t > only common OOAM Header but common OOAM mechanisms, e.g. Echo > Request/Reply > . > > > > With the above in mind, I=E2=80=99d suggest that the WG moves forward wit= h > specific definitions for encapsulating IOAM data into protocols =E2=80=93= per the > above mentioned drafts. > > > > Regards, Frank > > > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://www.ietf.org/mailman/listinfo/ippm > > > --883d24f22754510a1e0569ad88cd Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Frank,
I think you've misunderstood my response= to your statements:
  • the scope of OOAM,=C2=A0contrary to what you've stated, is clearly stated i= n the draft;
  • what you present as "efficiency" I consider = to be serious limitations (lack of versioning, limited size for data, and n= o future extension) that should be explained and thoroughly discussed by th= e WGs that develop corresponding overlay networks before IPPM WG makes any = decision.
Regards,
Greg

On Thu, Apr 12, 2018 at 8:0= 6 PM, Frank Brockners (fbrockne) <fbrockne@cisco.com> wrote= :

Hi Greg,

=C2=A0

thanks =E2=80=93 and i= t seems that we=E2=80=99re on the same page with regards to efficiency (4 b= ytes of non-required overhead) and maturity (or lack of) of OOAM.

=C2=A0

On the IOAM implementa= tion: There are several implementations of IOAM. Some of which have recentl= y been worked on and shown at an IETF hackathon, see https://datatracker.ietf.org/meeting/100/materials/slides-100-hac= kathon-sessa-in-situ-oam-ioam - where we=E2=80=99ve shown IPv6 and= VXLAN-GPE with IOAM =E2=80=93 on FD.io/VPP as well as on Barefoot Tofino. = You probably also remember the Netronome/Broadcom demo - https://www.youtube.com/watch?v=3Dj9FbD4a3F4E .

Below you seem to be s= pecifically referring to the IOAM open source implementation in FD.io/VPP: = There are protocol encapsulations for VXLAN-GPE, NSH, and IPv6 implemented in FD.io/VPP. The current code us= es the =E2=80=9Cnext header approach=E2=80=9D for VXLAN-GPE and it leverage= s MD-Type 2 for NSH. As you=E2=80=99re well aware, there the discussion in = SFC whether to use MD-Type 2 or next header encapsulating IOAM data in NSH isn=E2=80=99t yet settled, hence we=E2=80=99ll refrain fr= om updating the code until SFC WG has come to a conclusion.

=C2=A0

Could you provide a po= inter to an OOAM implementation?

=C2=A0

Thanks,<= /span>

Frank

=C2=A0

From: = Greg Mirsky <= gregimirsky@gmail.com>
Sent: Donnerstag, 12. April 2018 18:54
To: Frank Brockners (fbrockne) <fbrockne@cisco.com>
Cc: IETF IPPM WG <ippm@ietf.org>; NVO3 <nvo3@ietf.org>; Service Function Chaining IETF list <= sfc@ietf.org>; int-area@ietf.org Subject: Re: [ippm] encapsulation of IOAM data in various protocols = - follow up from WG discussion in London

=C2=A0

Hi Frank,

thank you for sharing your points. Please find my no= tes in-line and tagged GIM>>. I believe that this is very much releva= nt to work of other working groups that directly work on the overlay encaps= ulations in the center of the discussion and hence I've added them to the list. Hope we'll have more opinio= ns to reach the conclusion that is acceptable to all.

=C2=A0

Regards,

Greg

=C2=A0

On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (f= brockne) <fbrock= ne@cisco.com> wrote:

Back at the IPPM meeting in Lon= don, we discussed several drafts dealing with the encapsulation of IOAM dat= a in various protocols (draft-brockners-ippm-ioam-vxlan-gpe-00, draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). On= e discussion topic that we decided to take to the list was the question on = whether draft-ooamdt-rtgwg-ooam-header could be leveraged.=C2=A0 After care= fully considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusion that the =E2=80=9COOAM header=E2=80=9D does not m= eet the needs of IOAM:

* Efficiency: IOAM adds data to= live user traffic. As such, an encapsulation needs to be as efficient as p= ossible. The =E2=80=9COOAM header=E2=80=9D is 8 bytes long. The approach for IOAM data encapsulation in the above mentioned drafts only requires 4 = bytes. Using the OOAM header approach would add an unnecessary overhead of = 4 bytes =E2=80=93 which is significant.

GIM>> The difference in four octets is because= OOAM Header:

  • provides more flexibility, e.g. Flags field and Reserved fields;<= /u>
  • supports larger OAM packets than iOAM header;
  • is future proof by supporting versioning (Version field).

* Maturity: IOAM has several im= plementations, which were also shown at recent IETF hackathons =E2=80=93 an= d we=E2=80=99re expecting additional implementations to be publicized soon. Interoperable implementations need timely specifications. Despite th= e question being asked, the recent thread on OOAM in the NVO3 list hasn=E2= =80=99t revealed any implementation of the OOAM header. In addition, the th= read revealed that several fundamental questions about the OOAM header are still open, such as whether or how active OAM me= chanisms within protocols such as Geneve would apply to the OOAM header. Th= is ultimately means that we won=E2=80=99t get to a timely specification.

GIM>> May I ask which encapsulations supported= by the implementations you refer to. Until very recently all iOAM proposal= s were to use meta-data TLV in, e.g. Geneve and NSH. And if these or some o= f these implementations already updated to the newly proposed iOAM shim, I don't see problem in making them us= e OOAM Header. Would you agree?

=C2=A0

* Scope: It isn=E2=80=99t entir= ely clear to which protocols the OOAM header would ultimately apply to. The= way the OOAM header is defined, OOAM uses a 8-bit field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protocols that IOAM d= ata needs to be encapsulated into use 16-bits for their next protocol code = points. See e.g. the GRE encapsulation =E2=80=93 as specified in draft-weis= -ippm-ioam-gre-00.

GIM>> The first paragraph of the Introduction = section states:

=C2=A0 =C2=A0New protocols that support overlay netw= orks like VxLAN-GPE

=C2=A0 =C2=A0[I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.iet= f-nvo3-gue], Geneve

=C2=A0 =C2=A0[I-D.ietf-nvo3-geneve], BIER [I-D.ietf-= bier-mpls-encapsulation], and

=C2=A0 =C2=A0NSH [I-D.ietf-sfc-nsh] support multi-pr= otocol payload, e.g.

=C2=A0 =C2=A0Ethernet, IPv4/IPv6, and recognize Oper= ations, Administration, and

=C2=A0 =C2=A0Maintenance (OAM) as one of distinct ty= pes.=C2=A0 That ensures that

=C2=A0 =C2=A0Overlay OAM (OOAM)packets are sharing f= ate with Overlay data packet

=C2=A0 =C2=A0traversing the underlay.=C2=A0

I'm updating the OOAM Header draft and along wit= h cleaning nits will update reference to GUE. I think that the list and the= statemnt are quite clear in identifying the scope of networks that may ben= efit from using not only common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply.

=C2=A0

With the above in mind, I=E2=80= =99d suggest that the WG moves forward with specific definitions for encaps= ulating IOAM data into protocols =E2=80=93 per the above mentioned drafts.<= /span>

=C2=A0

Regards, Frank


_______________________________________________
ippm mailing list
ippm@ietf.org
ht= tps://www.ietf.org/mailman/listinfo/ippm

=C2=A0


--883d24f22754510a1e0569ad88cd-- From nobody Thu Apr 12 14:47:10 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 427B0129C59 for ; Thu, 12 Apr 2018 14:46:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.609 X-Spam-Level: X-Spam-Status: No, score=-2.609 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_LOW=-0.7, T_DKIMWL_WL_MED=-0.01, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=herbertland-com.20150623.gappssmtp.com 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 CO6ljbmt6muO for ; Thu, 12 Apr 2018 14:46:52 -0700 (PDT) Received: from mail-qk0-x229.google.com (mail-qk0-x229.google.com [IPv6:2607:f8b0:400d:c09::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5FAC81271FD for ; Thu, 12 Apr 2018 14:46:50 -0700 (PDT) Received: by mail-qk0-x229.google.com with SMTP id j73so7118347qke.6 for ; Thu, 12 Apr 2018 14:46:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=herbertland-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=/91CaAn2dy/nvMMrocaC7bJAliXzb0WpY5Jf6tYeD7E=; b=gKPYxkek+Mf+yuiNRuktuceLddgZqb2wQgH/jwBiaCyn8P0PbCBBJtfkI7Xjb5YfwS +cU9Dx8EhVOd0lDzJa2exBh8VO2ONeCSdVnbBVuI7QHFn0nOz7lx9yCCpdy5rkHcFGD2 Tcf2az6w9xCj9IQAw96YZkeGPx2RU1ooTki3Vz+9+j4osrnbPGOF8jdXSAaDir6O8AIw 7Hq0fs86Uh+XPySYFqOOLu5iOo2ZZNMsjOSNulzM3zneqRLom+PUHzngOb9jWMbAx+Gt IQpbjTY6gxW1M1WM9ow0gjXyc7yGVBTWiVMltxj9aWEQP6hr9crW/HbDqDeobUH5OB8M mNtg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=/91CaAn2dy/nvMMrocaC7bJAliXzb0WpY5Jf6tYeD7E=; b=jio7pWHJy/Vexg1IZhNrvBACg9LYTY+XLgewMC8te5aWUn2WCj88gFsahroYS3FLbi ZxkBTRHoWdqKu+zZGNpoQ92OV77DTVZnJHkX6DZ56ggoQ509IBJW/s411oso5XwAHy+L YvSPZBfGXwVimLASxSo50CEM9i+YPoLY2NgN6vC7/2h3vb+9M3ntSYk1GU3v5y0BDUwe PbpWSFpTVgG3OKn3WgEI5yJuT6zZpEY7ODNiUcrkcnXQPgk6aUPigBxQVHH8wsH60MBq MiPg9k+yc1Qf3IscapW5rUp5NzxqHGeC2/9Rh3l/Ubkh5PeqAmwwouUOGlwWzShCDtP8 Q9Lw== X-Gm-Message-State: ALQs6tCEvlXIi6msp+ZfSBB7Ycdz7lgFuTZi/AJngeJoxOA5pbs3IpEy S+mGJHYQxfrc8b2EQxV6jLISgJH2saQuyMtrYqrNuw== X-Google-Smtp-Source: AIpwx4+eNzO8rgj37hnCounJluao3ouaNROJpxh0XreIGbvlCxqgpxlTZsdSsD7cbUgRf0f2qoQ/Yae0OmQUB2yGMik= X-Received: by 10.55.203.135 with SMTP id u7mr2460398qkl.190.1523569608859; Thu, 12 Apr 2018 14:46:48 -0700 (PDT) MIME-Version: 1.0 Received: by 10.200.26.135 with HTTP; Thu, 12 Apr 2018 14:46:48 -0700 (PDT) In-Reply-To: References: From: Tom Herbert Date: Thu, 12 Apr 2018 14:46:48 -0700 Message-ID: To: Greg Mirsky Cc: "Frank Brockners (fbrockne)" , NVO3 , int-area@ietf.org, Service Function Chaining IETF list , IETF IPPM WG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [sfc] [Int-area] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 21:46:54 -0000 On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky wrote: > Hi Frank, > thank you for sharing your points. Please find my notes in-line and tagge= d > GIM>>. I believe that this is very much relevant to work of other working > groups that directly work on the overlay encapsulations in the center of = the > discussion and hence I've added them to the list. Hope we'll have more > opinions to reach the conclusion that is acceptable to all. > > Regards, > Greg > > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) > wrote: >> >> Back at the IPPM meeting in London, we discussed several drafts dealing >> with the encapsulation of IOAM data in various protocols >> (draft-brockners-ippm-ioam-vxlan-gpe-00, >> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). One >> discussion topic that we decided to take to the list was the question on >> whether draft-ooamdt-rtgwg-ooam-header could be leveraged. After carefu= lly >> considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusion tha= t >> the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM: >> >> * Efficiency: IOAM adds data to live user traffic. As such, an >> encapsulation needs to be as efficient as possible. The =E2=80=9COOAM he= ader=E2=80=9D is 8 >> bytes long. The approach for IOAM data encapsulation in the above mentio= ned >> drafts only requires 4 bytes. Using the OOAM header approach would add a= n >> unnecessary overhead of 4 bytes =E2=80=93 which is significant. Greg, I'm missing something here. I looked at the drafts you referenced and each of them looks like the overhead for OAM is greater that four bytes. In each there is some overhead equivalent to type/length, for instance in Geneve four bytes are needed for option class, type, and length. Unless the the OAM data is zero length, I don't see how this adds up to only four bytes of overhead. Tom > > GIM>> The difference in four octets is because OOAM Header: > > provides more flexibility, e.g. Flags field and Reserved fields; > supports larger OAM packets than iOAM header; > is future proof by supporting versioning (Version field). >> >> * Maturity: IOAM has several implementations, which were also shown at >> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting additional = implementations to >> be publicized soon. Interoperable implementations need timely >> specifications. Despite the question being asked, the recent thread on O= OAM >> in the NVO3 list hasn=E2=80=99t revealed any implementation of the OOAM = header. In >> addition, the thread revealed that several fundamental questions about t= he >> OOAM header are still open, such as whether or how active OAM mechanisms >> within protocols such as Geneve would apply to the OOAM header. This >> ultimately means that we won=E2=80=99t get to a timely specification. > > GIM>> May I ask which encapsulations supported by the implementations you > refer to. Until very recently all iOAM proposals were to use meta-data TL= V > in, e.g. Geneve and NSH. And if these or some of these implementations > already updated to the newly proposed iOAM shim, I don't see problem in > making them use OOAM Header. Would you agree? > >> >> * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM hea= der would >> ultimately apply to. The way the OOAM header is defined, OOAM uses a 8-b= it >> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protocols= that IOAM data >> needs to be encapsulated into use 16-bits for their next protocol code >> points. See e.g. the GRE encapsulation =E2=80=93 as specified in >> draft-weis-ippm-ioam-gre-00. > > GIM>> The first paragraph of the Introduction section states: > New protocols that support overlay networks like VxLAN-GPE > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve > [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], and > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. > Ethernet, IPv4/IPv6, and recognize Operations, Administration, and > Maintenance (OAM) as one of distinct types. That ensures that > Overlay OAM (OOAM)packets are sharing fate with Overlay data packet > traversing the underlay. > I'm updating the OOAM Header draft and along with cleaning nits will upda= te > reference to GUE. I think that the list and the statemnt are quite clear = in > identifying the scope of networks that may benefit from using not only > common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply. > >> With the above in mind, I=E2=80=99d suggest that the WG moves forward wi= th >> specific definitions for encapsulating IOAM data into protocols =E2=80= =93 per the >> above mentioned drafts. >> >> >> >> Regards, Frank >> >> >> _______________________________________________ >> ippm mailing list >> ippm@ietf.org >> https://www.ietf.org/mailman/listinfo/ippm >> > > > _______________________________________________ > Int-area mailing list > Int-area@ietf.org > https://www.ietf.org/mailman/listinfo/int-area > From nobody Thu Apr 12 14:50:47 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AFFB512AF83; Thu, 12 Apr 2018 14:50:39 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 Vuo_yx9nsPS8; Thu, 12 Apr 2018 14:50:36 -0700 (PDT) Received: from mail-lf0-x22c.google.com (mail-lf0-x22c.google.com [IPv6:2a00:1450:4010:c07::22c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E5399129C59; Thu, 12 Apr 2018 14:50:35 -0700 (PDT) Received: by mail-lf0-x22c.google.com with SMTP id b189-v6so9843725lfe.2; Thu, 12 Apr 2018 14:50:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=fq7zyng+lxyLbX5cwPEmv3FJPJCLcdaGMLSGikg7yhY=; b=eysnN8lxYjyvPCCuFUzmT5SCSRnyfDey4ueJJFBeJkatpLK40i2LzkszaDsfKoUVV/ OXg6Nno87SBqo78+f2MFWoJecR/xaPDXUWWfvDG3Y7o51T1xdA5BFvSsrrXqLjkoMz7D sCtyA48xs3Ouue00Q8c33e25CvTi/c+LVyOyAeceFW4AcWtf6ef8gDc4+6KEMaOvCfW3 PjfISl3XFtParxd9/qtnQNZsgoAA2yeKjNxXKRCf7VsEFPaodIg+6QT+RTzADIbsL/Cx 1zYPYtOcYZ/BBLCfV6/mnO3xND17DlnbslFVkIDlV3GSDc+BB0K4Mk4eFezwu9N4gFNA DYoQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=fq7zyng+lxyLbX5cwPEmv3FJPJCLcdaGMLSGikg7yhY=; b=jGPRPULz1iayiQDojCwiFRI/O6R6YIxEvV4ZmCymjWLaX3Hg2GGdvC8xWcuwYpzZNc bmRPdyTPAu36aYuWIC1r0F+tlF11+t6Iu6qr9en8FIaa3bbRxa2Yf3nptFuwyUuC22Fh XHj9Ll8TSGvQaiip0xTobIfpSt1D0XVHQhipoN56YDAFrGnB15xYAvNeZrJOQPOpOGJn KCmzoOiG7we+h5GZXL+AyIMGUgfPFtlhODDC0K7iZQb3C54SMOHI2dBSXiT6GThzYmR7 Nl8XPhO2zPW2LrbV5nqSYYmlaItxYeMuib4Hpt5DezfTLMONV1jjKzZh+o0DpCEHrSK6 uNwA== X-Gm-Message-State: ALQs6tAqwHg9GKKWDVYVu8ftGMk8jLqLc76Aq3vTH4YMwUAxtewj/Rml IfwjWPidCXTd96D4iEsRKRBGfRclaAjSk/MIHb4= X-Google-Smtp-Source: AIpwx4/cxRn95yZtiJ53VNMuRLWt8Dg5CORlZThaF4zHwkSO+2HF+U0nnN5S10TLViCz+fEPjHhx8JRsFF7z8ssGITQ= X-Received: by 10.46.32.154 with SMTP id g26mr1658501lji.71.1523569834080; Thu, 12 Apr 2018 14:50:34 -0700 (PDT) MIME-Version: 1.0 Received: by 10.46.73.66 with HTTP; Thu, 12 Apr 2018 14:50:33 -0700 (PDT) In-Reply-To: References: From: Greg Mirsky Date: Thu, 12 Apr 2018 23:50:33 +0200 Message-ID: To: Tom Herbert Cc: "Frank Brockners (fbrockne)" , NVO3 , int-area@ietf.org, Service Function Chaining IETF list , IETF IPPM WG Content-Type: multipart/alternative; boundary="001a1143062ac03f9f0569adbeb7" Archived-At: Subject: Re: [sfc] [Int-area] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 21:50:40 -0000 --001a1143062ac03f9f0569adbeb7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Tom, could you please mention which drafts, iOAM or OOAM, you refer to. Please note, that OOAM supports both active and hybrid OAM methods, while iOAM only the latter. Regards, Greg On Thu, Apr 12, 2018 at 11:46 PM, Tom Herbert wrote: > On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky > wrote: > > Hi Frank, > > thank you for sharing your points. Please find my notes in-line and > tagged > > GIM>>. I believe that this is very much relevant to work of other worki= ng > > groups that directly work on the overlay encapsulations in the center o= f > the > > discussion and hence I've added them to the list. Hope we'll have more > > opinions to reach the conclusion that is acceptable to all. > > > > Regards, > > Greg > > > > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) > > wrote: > >> > >> Back at the IPPM meeting in London, we discussed several drafts dealin= g > >> with the encapsulation of IOAM data in various protocols > >> (draft-brockners-ippm-ioam-vxlan-gpe-00, > >> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). One > >> discussion topic that we decided to take to the list was the question = on > >> whether draft-ooamdt-rtgwg-ooam-header could be leveraged. After > carefully > >> considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusion > that > >> the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM: > >> > >> * Efficiency: IOAM adds data to live user traffic. As such, an > >> encapsulation needs to be as efficient as possible. The =E2=80=9COOAM = header=E2=80=9D > is 8 > >> bytes long. The approach for IOAM data encapsulation in the above > mentioned > >> drafts only requires 4 bytes. Using the OOAM header approach would add > an > >> unnecessary overhead of 4 bytes =E2=80=93 which is significant. > Greg, > > I'm missing something here. I looked at the drafts you referenced and > each of them looks like the overhead for OAM is greater that four > bytes. In each there is some overhead equivalent to type/length, for > instance in Geneve four bytes are needed for option class, type, and > length. Unless the the OAM data is zero length, I don't see how this > adds up to only four bytes of overhead. > > Tom > > > > > GIM>> The difference in four octets is because OOAM Header: > > > > provides more flexibility, e.g. Flags field and Reserved fields; > > supports larger OAM packets than iOAM header; > > is future proof by supporting versioning (Version field). > >> > >> * Maturity: IOAM has several implementations, which were also shown at > >> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting additiona= l implementations > to > >> be publicized soon. Interoperable implementations need timely > >> specifications. Despite the question being asked, the recent thread on > OOAM > >> in the NVO3 list hasn=E2=80=99t revealed any implementation of the OOA= M header. > In > >> addition, the thread revealed that several fundamental questions about > the > >> OOAM header are still open, such as whether or how active OAM mechanis= ms > >> within protocols such as Geneve would apply to the OOAM header. This > >> ultimately means that we won=E2=80=99t get to a timely specification. > > > > GIM>> May I ask which encapsulations supported by the implementations y= ou > > refer to. Until very recently all iOAM proposals were to use meta-data > TLV > > in, e.g. Geneve and NSH. And if these or some of these implementations > > already updated to the newly proposed iOAM shim, I don't see problem in > > making them use OOAM Header. Would you agree? > > > >> > >> * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM h= eader > would > >> ultimately apply to. The way the OOAM header is defined, OOAM uses a > 8-bit > >> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protoco= ls that IOAM data > >> needs to be encapsulated into use 16-bits for their next protocol code > >> points. See e.g. the GRE encapsulation =E2=80=93 as specified in > >> draft-weis-ippm-ioam-gre-00. > > > > GIM>> The first paragraph of the Introduction section states: > > New protocols that support overlay networks like VxLAN-GPE > > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve > > [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], and > > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. > > Ethernet, IPv4/IPv6, and recognize Operations, Administration, and > > Maintenance (OAM) as one of distinct types. That ensures that > > Overlay OAM (OOAM)packets are sharing fate with Overlay data packet > > traversing the underlay. > > I'm updating the OOAM Header draft and along with cleaning nits will > update > > reference to GUE. I think that the list and the statemnt are quite clea= r > in > > identifying the scope of networks that may benefit from using not only > > common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply. > > > >> With the above in mind, I=E2=80=99d suggest that the WG moves forward = with > >> specific definitions for encapsulating IOAM data into protocols =E2=80= =93 per > the > >> above mentioned drafts. > >> > >> > >> > >> Regards, Frank > >> > >> > >> _______________________________________________ > >> ippm mailing list > >> ippm@ietf.org > >> https://www.ietf.org/mailman/listinfo/ippm > >> > > > > > > _______________________________________________ > > Int-area mailing list > > Int-area@ietf.org > > https://www.ietf.org/mailman/listinfo/int-area > > > --001a1143062ac03f9f0569adbeb7 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Tom,
could you please mention which drafts, iOAM or= OOAM, you refer to. Please note, that OOAM supports both active and hybrid= OAM methods, while iOAM only the latter.

Regards,=
Greg

On Thu, Apr 12, 2018 at 11:46 PM, Tom Herbert &= lt;tom@herbertland= .com> wrote:
On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky <gregimirsky@gmail.com> wrote:
> Hi Frank,
> thank you for sharing your points. Please find my notes in-line and ta= gged
> GIM>>. I believe that this is very much relevant to work of othe= r working
> groups that directly work on the overlay encapsulations in the center = of the
> discussion and hence I've added them to the list. Hope we'll h= ave more
> opinions to reach the conclusion that is acceptable to all.
>
> Regards,
> Greg
>
> On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne)
> <fbrockne@cisco.com> w= rote:
>>
>> Back at the IPPM meeting in London, we discussed several drafts de= aling
>> with the encapsulation of IOAM data in various protocols
>> (draft-brockners-ippm-ioam-vxlan-gpe-00,
>> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre= -00). One
>> discussion topic that we decided to take to the list was the quest= ion on
>> whether draft-ooamdt-rtgwg-ooam-header could be leveraged.=C2=A0 A= fter carefully
>> considering draft-ooamdt-rtgwg-ooam-header, I came to the con= clusion that
>> the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM:=
>>
>> * Efficiency: IOAM adds data to live user traffic. As such, an
>> encapsulation needs to be as efficient as possible. The =E2=80=9CO= OAM header=E2=80=9D is 8
>> bytes long. The approach for IOAM data encapsulation in the above = mentioned
>> drafts only requires 4 bytes. Using the OOAM header approach would= add an
>> unnecessary overhead of 4 bytes =E2=80=93 which is significant. Greg,

I'm missing something here. I looked at the drafts you referenced and each of them looks like the overhead for OAM is greater that four
bytes. In each there is some overhead equivalent to type/length, for
instance in Geneve four bytes are needed for option class, type, and
length. Unless the the OAM data is zero length, I don't see how this adds up to only four bytes of overhead.

Tom

>
> GIM>> The difference in four octets is because OOAM Header:
>
> provides more flexibility, e.g. Flags field and Reserved fields;
> supports larger OAM packets than iOAM header;
> is future proof by supporting versioning (Version field).
>>
>> * Maturity: IOAM has several implementations, which were also show= n at
>> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting addit= ional implementations to
>> be publicized soon. Interoperable implementations need timely
>> specifications. Despite the question being asked, the recent threa= d on OOAM
>> in the NVO3 list hasn=E2=80=99t revealed any implementation of the= OOAM header. In
>> addition, the thread revealed that several fundamental questions a= bout the
>> OOAM header are still open, such as whether or how active OAM mech= anisms
>> within protocols such as Geneve would apply to the OOAM header. Th= is
>> ultimately means that we won=E2=80=99t get to a timely specificati= on.
>
> GIM>> May I ask which encapsulations supported by the implementa= tions you
> refer to. Until very recently all iOAM proposals were to use meta-data= TLV
> in, e.g. Geneve and NSH. And if these or some of these implementations=
> already updated to the newly proposed iOAM shim, I don't see probl= em in
> making them use OOAM Header. Would you agree?
>
>>
>> * Scope: It isn=E2=80=99t entirely clear to which protocols the OO= AM header would
>> ultimately apply to. The way the OOAM header is defined, OOAM uses= a 8-bit
>> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some pro= tocols that IOAM data
>> needs to be encapsulated into use 16-bits for their next protocol = code
>> points. See e.g. the GRE encapsulation =E2=80=93 as specified in >> draft-weis-ippm-ioam-gre-00.
>
> GIM>> The first paragraph of the Introduction section states: >=C2=A0 =C2=A0 New protocols that support overlay networks like VxLAN-GP= E
>=C2=A0 =C2=A0 [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Genev= e
>=C2=A0 =C2=A0 [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-enc= apsulation], and
>=C2=A0 =C2=A0 NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.= g.
>=C2=A0 =C2=A0 Ethernet, IPv4/IPv6, and recognize Operations, Administra= tion, and
>=C2=A0 =C2=A0 Maintenance (OAM) as one of distinct types.=C2=A0 That en= sures that
>=C2=A0 =C2=A0 Overlay OAM (OOAM)packets are sharing fate with Overlay d= ata packet
>=C2=A0 =C2=A0 traversing the underlay.
> I'm updating the OOAM Header draft and along with cleaning nits wi= ll update
> reference to GUE. I think that the list and the statemnt are quite cle= ar in
> identifying the scope of networks that may benefit from using not only=
> common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply= .
>
>> With the above in mind, I=E2=80=99d suggest that the WG moves forw= ard with
>> specific definitions for encapsulating IOAM data into protocols = =E2=80=93 per the
>> above mentioned drafts.
>>
>>
>>
>> Regards, Frank
>>
>>
>> _______________________________________________
>> ippm mailing list
>> ippm@ietf.org
>> https://www.ietf.org/mailman/listinfo/ippm
>>
>
>
> __________________= _____________________________
> Int-area mailing list
> Int-area@ietf.org
> https://www.ietf.org/mailman/listinfo/int-ar= ea
>

--001a1143062ac03f9f0569adbeb7-- From nobody Thu Apr 12 14:53:39 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EAC4912AF83 for ; Thu, 12 Apr 2018 14:53:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.609 X-Spam-Level: X-Spam-Status: No, score=-2.609 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_LOW=-0.7, T_DKIMWL_WL_MED=-0.01, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=herbertland-com.20150623.gappssmtp.com 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 n3AZaVV-tYTK for ; Thu, 12 Apr 2018 14:53:22 -0700 (PDT) Received: from mail-qk0-x22c.google.com (mail-qk0-x22c.google.com [IPv6:2607:f8b0:400d:c09::22c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AE1B3129C59 for ; Thu, 12 Apr 2018 14:53:17 -0700 (PDT) Received: by mail-qk0-x22c.google.com with SMTP id w6so7153724qkb.4 for ; Thu, 12 Apr 2018 14:53:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=herbertland-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=IgLlpyLqm/eJ52btMRF1Sb2UQYVgAHBD6AWIWR1UeJ0=; b=hH81HYQyruLvE1zUu9AKAL1577Dvka3ZFertoeZMKNN4suXPAQVCiKNuFCC2i6KYFv CbGseQCQ3dGoc6SiTZgBkOlEh8hqRqXrlaUq2Gfg7NzuNqKo0bP824tElPl/fv9AGIss 0gBAsduaj2scI7HDZquvHs3TAY7Zmpqc2NLvBm3Wqch2ymj5mNgpm7rsBPvRs9WvpCd+ PS74NRpQ0gH+Olf+qPBu9hayCAgxp0pPU8sKdUBbUFx1z+kup9dpNICIv+GShmhwS4tG kaQ0P9VdfYGG3oyI2zhB0MlIGhvSkh4MvdqTDARpFE5/z8/4GOfOcet79d5yc/ze6RjS szMQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=IgLlpyLqm/eJ52btMRF1Sb2UQYVgAHBD6AWIWR1UeJ0=; b=Uk0UVDTncNazYR/PVm12GrfJtpY3Rj9yantMq+u27sE+3zAxn50DspLcmeuxKNd2Oe 5h4Pfby/K1H2jgt4BLb+hQJv1BMli+kMgEe+6YUGfgFy8DLPgUYrN5OP7iYYtO1SRnxl mc4E6IkDWfe/DDcC9AzwGDvnvF9U0iSJpKqYidCT0lJh5kVb1tkAF3RYG8T7FR1NXmCT OKjCsGu3Yp6F3SVvj5t+dwq75+ZGoek6ioF5gZ29Nyu7zS/g6MLuf+tUw/WSpkrmYvDg TNHcpJZ4VBSLeJqVi4ezGIHjfsszwtcIMbSFTthZuHgM2ogFicOon32qFw5s0h46OdGh Uuzw== X-Gm-Message-State: ALQs6tAGVOQw+nI5TGZAyaVZcM4MADcv85xnY1J52KuIiSh+LAa5+kia IU3PqbIZ7VrNfPO2nEWhfnUhsgKXYbJ0FmvYWfEaTA== X-Google-Smtp-Source: AIpwx4+Js6lf9CYXf3VsLcKq1C7MrMG5oTrkJzEWxuhvIrQL5TkjznPIm+H4JXcWfqK6mNHJAqYcyjHDjl1DxcFH3Wk= X-Received: by 10.55.195.85 with SMTP id a82mr2616603qkj.49.1523569996580; Thu, 12 Apr 2018 14:53:16 -0700 (PDT) MIME-Version: 1.0 Received: by 10.200.26.135 with HTTP; Thu, 12 Apr 2018 14:53:16 -0700 (PDT) In-Reply-To: References: From: Tom Herbert Date: Thu, 12 Apr 2018 14:53:16 -0700 Message-ID: To: Greg Mirsky Cc: "Frank Brockners (fbrockne)" , NVO3 , int-area@ietf.org, Service Function Chaining IETF list , IETF IPPM WG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [sfc] [Int-area] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 21:53:24 -0000 On Thu, Apr 12, 2018 at 2:50 PM, Greg Mirsky wrote: > Hi Tom, > could you please mention which drafts, iOAM or OOAM, you refer to. Please > note, that OOAM supports both active and hybrid OAM methods, while iOAM o= nly > the latter. Section 3 of draft-brockners-ippm-ioam-geneve-00 for instance. > > Regards, > Greg > > On Thu, Apr 12, 2018 at 11:46 PM, Tom Herbert wrote= : >> >> On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky >> wrote: >> > Hi Frank, >> > thank you for sharing your points. Please find my notes in-line and >> > tagged >> > GIM>>. I believe that this is very much relevant to work of other >> > working >> > groups that directly work on the overlay encapsulations in the center = of >> > the >> > discussion and hence I've added them to the list. Hope we'll have more >> > opinions to reach the conclusion that is acceptable to all. >> > >> > Regards, >> > Greg >> > >> > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) >> > wrote: >> >> >> >> Back at the IPPM meeting in London, we discussed several drafts deali= ng >> >> with the encapsulation of IOAM data in various protocols >> >> (draft-brockners-ippm-ioam-vxlan-gpe-00, >> >> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). On= e >> >> discussion topic that we decided to take to the list was the question >> >> on >> >> whether draft-ooamdt-rtgwg-ooam-header could be leveraged. After >> >> carefully >> >> considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusion >> >> that >> >> the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM: >> >> >> >> * Efficiency: IOAM adds data to live user traffic. As such, an >> >> encapsulation needs to be as efficient as possible. The =E2=80=9COOAM= header=E2=80=9D >> >> is 8 >> >> bytes long. The approach for IOAM data encapsulation in the above >> >> mentioned >> >> drafts only requires 4 bytes. Using the OOAM header approach would ad= d >> >> an >> >> unnecessary overhead of 4 bytes =E2=80=93 which is significant. >> Greg, >> >> I'm missing something here. I looked at the drafts you referenced and >> each of them looks like the overhead for OAM is greater that four >> bytes. In each there is some overhead equivalent to type/length, for >> instance in Geneve four bytes are needed for option class, type, and >> length. Unless the the OAM data is zero length, I don't see how this >> adds up to only four bytes of overhead. >> >> Tom >> >> > >> > GIM>> The difference in four octets is because OOAM Header: >> > >> > provides more flexibility, e.g. Flags field and Reserved fields; >> > supports larger OAM packets than iOAM header; >> > is future proof by supporting versioning (Version field). >> >> >> >> * Maturity: IOAM has several implementations, which were also shown a= t >> >> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting addition= al implementations >> >> to >> >> be publicized soon. Interoperable implementations need timely >> >> specifications. Despite the question being asked, the recent thread o= n >> >> OOAM >> >> in the NVO3 list hasn=E2=80=99t revealed any implementation of the OO= AM header. >> >> In >> >> addition, the thread revealed that several fundamental questions abou= t >> >> the >> >> OOAM header are still open, such as whether or how active OAM >> >> mechanisms >> >> within protocols such as Geneve would apply to the OOAM header. This >> >> ultimately means that we won=E2=80=99t get to a timely specification. >> > >> > GIM>> May I ask which encapsulations supported by the implementations >> > you >> > refer to. Until very recently all iOAM proposals were to use meta-data >> > TLV >> > in, e.g. Geneve and NSH. And if these or some of these implementations >> > already updated to the newly proposed iOAM shim, I don't see problem i= n >> > making them use OOAM Header. Would you agree? >> > >> >> >> >> * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM = header >> >> would >> >> ultimately apply to. The way the OOAM header is defined, OOAM uses a >> >> 8-bit >> >> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protoc= ols that IOAM data >> >> needs to be encapsulated into use 16-bits for their next protocol cod= e >> >> points. See e.g. the GRE encapsulation =E2=80=93 as specified in >> >> draft-weis-ippm-ioam-gre-00. >> > >> > GIM>> The first paragraph of the Introduction section states: >> > New protocols that support overlay networks like VxLAN-GPE >> > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve >> > [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], an= d >> > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. >> > Ethernet, IPv4/IPv6, and recognize Operations, Administration, and >> > Maintenance (OAM) as one of distinct types. That ensures that >> > Overlay OAM (OOAM)packets are sharing fate with Overlay data packet >> > traversing the underlay. >> > I'm updating the OOAM Header draft and along with cleaning nits will >> > update >> > reference to GUE. I think that the list and the statemnt are quite cle= ar >> > in >> > identifying the scope of networks that may benefit from using not only >> > common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply= . >> > >> >> With the above in mind, I=E2=80=99d suggest that the WG moves forward= with >> >> specific definitions for encapsulating IOAM data into protocols =E2= =80=93 per >> >> the >> >> above mentioned drafts. >> >> >> >> >> >> >> >> Regards, Frank >> >> >> >> >> >> _______________________________________________ >> >> ippm mailing list >> >> ippm@ietf.org >> >> https://www.ietf.org/mailman/listinfo/ippm >> >> >> > >> > >> > _______________________________________________ >> > Int-area mailing list >> > Int-area@ietf.org >> > https://www.ietf.org/mailman/listinfo/int-area >> > > > From nobody Thu Apr 12 14:56:29 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4238512D77A; Thu, 12 Apr 2018 14:56:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 I0DhagjZj07z; Thu, 12 Apr 2018 14:56:15 -0700 (PDT) Received: from mail-lf0-x236.google.com (mail-lf0-x236.google.com [IPv6:2a00:1450:4010:c07::236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C7A3712AF83; Thu, 12 Apr 2018 14:56:14 -0700 (PDT) Received: by mail-lf0-x236.google.com with SMTP id b189-v6so9859200lfe.2; Thu, 12 Apr 2018 14:56:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=FB2yzuZofrNdAYIaFgvxgT+74i3/Ogq/NpHcIQuYhck=; b=E2iZMHJmkdRQcIqejKW8SWbx47v3Wn64x6Cvnv7VfnGvVpfwyrm7h10qb/33RX7BIb 9eSrHgO09kYukhC3AToOIW1MrBxDhzwLIUN+GopnfWBHkcmxE1Yf1GLgMSFUxx9oLxO2 i/PqrhsJY+NTxCL+Txr4cnWyjwDSIZLsfNRWSpph1cjdXjO8EV+UP6wycyyxRZJJ2lUP B3Mn6gyVlPH9PChO45aR2M83XJLnyTmkSpjal8J+7GJSiSan2zV3nNTVOIll5oxcN5rv 3QvOPTQ2MiD7hxIdO8Pia/AMfWoHL5Rm4wD7pufaPPMnoY1I3b7uFTOBdLIr3J5eF9QN p6Tw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=FB2yzuZofrNdAYIaFgvxgT+74i3/Ogq/NpHcIQuYhck=; b=reh2+SeyfgaHT/cM9VsKROU0ArYHEq1jWpwZDRzL8jy6NX61k8Ymb4Iwl309WzOp3I 1RP7xE5U/1C3t5XUA7qKNsPV5RhAfDcD39wuzBI8//gB3hs1VfwPnoeX2p2nwv5/N8+4 1Bk+r4aqQ2LAdGvHOgKtnrrZwujD+QVwfBl7jGDBuk0VF8OC3Lnv/Qu+SX/EOOfjUmmZ dEj5qiM2qOHbKWoMVaJcJVyaLPrb+RsUO1CSF9cJEjFU3EOlxhAVwVVdABCuGSPClaX7 a6WTx/b0gN7TWIq1bCQXGABoElhNedO/2JjrB7+NRL92o/5J9j5cJzM4+P7pI7mVGfLi fnpw== X-Gm-Message-State: ALQs6tC/wKtNHFv/LITPR7gKQn/LB8vovFZXB8+nl4BJ+msyi6SZkU8z 9XtMxRgTHZevFio4WKAqhrwWKykCRA/oeSlwkXP6Lw== X-Google-Smtp-Source: AIpwx496q6SLmENT7UR0OFtHSYZWOHkHimJ4uJYXE0QyEuhaqoaiXgPj2Y0x1+X+WE2GkJK3C0Qs6Ovch0tyRRvs6jc= X-Received: by 2002:a19:aacd:: with SMTP id t196-v6mr6860922lfe.60.1523570172975; Thu, 12 Apr 2018 14:56:12 -0700 (PDT) MIME-Version: 1.0 Received: by 10.46.73.66 with HTTP; Thu, 12 Apr 2018 14:56:12 -0700 (PDT) In-Reply-To: References: From: Greg Mirsky Date: Thu, 12 Apr 2018 23:56:12 +0200 Message-ID: To: Tom Herbert Cc: "Frank Brockners (fbrockne)" , NVO3 , int-area@ietf.org, Service Function Chaining IETF list , IETF IPPM WG Content-Type: multipart/alternative; boundary="000000000000f361500569add2e1" Archived-At: Subject: Re: [sfc] [Int-area] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 21:56:19 -0000 --000000000000f361500569add2e1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Tom, I'll let Frank answer your question as it is on iOAM, not OOAM. Regards, Greg On Thu, Apr 12, 2018 at 11:53 PM, Tom Herbert wrote: > On Thu, Apr 12, 2018 at 2:50 PM, Greg Mirsky > wrote: > > Hi Tom, > > could you please mention which drafts, iOAM or OOAM, you refer to. Plea= se > > note, that OOAM supports both active and hybrid OAM methods, while iOAM > only > > the latter. > > Section 3 of draft-brockners-ippm-ioam-geneve-00 for instance. > > > > > Regards, > > Greg > > > > On Thu, Apr 12, 2018 at 11:46 PM, Tom Herbert > wrote: > >> > >> On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky > >> wrote: > >> > Hi Frank, > >> > thank you for sharing your points. Please find my notes in-line and > >> > tagged > >> > GIM>>. I believe that this is very much relevant to work of other > >> > working > >> > groups that directly work on the overlay encapsulations in the cente= r > of > >> > the > >> > discussion and hence I've added them to the list. Hope we'll have mo= re > >> > opinions to reach the conclusion that is acceptable to all. > >> > > >> > Regards, > >> > Greg > >> > > >> > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) > >> > wrote: > >> >> > >> >> Back at the IPPM meeting in London, we discussed several drafts > dealing > >> >> with the encapsulation of IOAM data in various protocols > >> >> (draft-brockners-ippm-ioam-vxlan-gpe-00, > >> >> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). > One > >> >> discussion topic that we decided to take to the list was the questi= on > >> >> on > >> >> whether draft-ooamdt-rtgwg-ooam-header could be leveraged. After > >> >> carefully > >> >> considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusio= n > >> >> that > >> >> the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM: > >> >> > >> >> * Efficiency: IOAM adds data to live user traffic. As such, an > >> >> encapsulation needs to be as efficient as possible. The =E2=80=9COO= AM header=E2=80=9D > >> >> is 8 > >> >> bytes long. The approach for IOAM data encapsulation in the above > >> >> mentioned > >> >> drafts only requires 4 bytes. Using the OOAM header approach would > add > >> >> an > >> >> unnecessary overhead of 4 bytes =E2=80=93 which is significant. > >> Greg, > >> > >> I'm missing something here. I looked at the drafts you referenced and > >> each of them looks like the overhead for OAM is greater that four > >> bytes. In each there is some overhead equivalent to type/length, for > >> instance in Geneve four bytes are needed for option class, type, and > >> length. Unless the the OAM data is zero length, I don't see how this > >> adds up to only four bytes of overhead. > >> > >> Tom > >> > >> > > >> > GIM>> The difference in four octets is because OOAM Header: > >> > > >> > provides more flexibility, e.g. Flags field and Reserved fields; > >> > supports larger OAM packets than iOAM header; > >> > is future proof by supporting versioning (Version field). > >> >> > >> >> * Maturity: IOAM has several implementations, which were also shown > at > >> >> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting additi= onal > implementations > >> >> to > >> >> be publicized soon. Interoperable implementations need timely > >> >> specifications. Despite the question being asked, the recent thread > on > >> >> OOAM > >> >> in the NVO3 list hasn=E2=80=99t revealed any implementation of the = OOAM > header. > >> >> In > >> >> addition, the thread revealed that several fundamental questions > about > >> >> the > >> >> OOAM header are still open, such as whether or how active OAM > >> >> mechanisms > >> >> within protocols such as Geneve would apply to the OOAM header. Thi= s > >> >> ultimately means that we won=E2=80=99t get to a timely specificatio= n. > >> > > >> > GIM>> May I ask which encapsulations supported by the implementation= s > >> > you > >> > refer to. Until very recently all iOAM proposals were to use meta-da= ta > >> > TLV > >> > in, e.g. Geneve and NSH. And if these or some of these implementatio= ns > >> > already updated to the newly proposed iOAM shim, I don't see problem > in > >> > making them use OOAM Header. Would you agree? > >> > > >> >> > >> >> * Scope: It isn=E2=80=99t entirely clear to which protocols the OOA= M header > >> >> would > >> >> ultimately apply to. The way the OOAM header is defined, OOAM uses = a > >> >> 8-bit > >> >> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some prot= ocols that IOAM > data > >> >> needs to be encapsulated into use 16-bits for their next protocol > code > >> >> points. See e.g. the GRE encapsulation =E2=80=93 as specified in > >> >> draft-weis-ippm-ioam-gre-00. > >> > > >> > GIM>> The first paragraph of the Introduction section states: > >> > New protocols that support overlay networks like VxLAN-GPE > >> > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve > >> > [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], > and > >> > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. > >> > Ethernet, IPv4/IPv6, and recognize Operations, Administration, an= d > >> > Maintenance (OAM) as one of distinct types. That ensures that > >> > Overlay OAM (OOAM)packets are sharing fate with Overlay data pack= et > >> > traversing the underlay. > >> > I'm updating the OOAM Header draft and along with cleaning nits will > >> > update > >> > reference to GUE. I think that the list and the statemnt are quite > clear > >> > in > >> > identifying the scope of networks that may benefit from using not on= ly > >> > common OOAM Header but common OOAM mechanisms, e.g. Echo > Request/Reply. > >> > > >> >> With the above in mind, I=E2=80=99d suggest that the WG moves forwa= rd with > >> >> specific definitions for encapsulating IOAM data into protocols =E2= =80=93 per > >> >> the > >> >> above mentioned drafts. > >> >> > >> >> > >> >> > >> >> Regards, Frank > >> >> > >> >> > >> >> _______________________________________________ > >> >> ippm mailing list > >> >> ippm@ietf.org > >> >> https://www.ietf.org/mailman/listinfo/ippm > >> >> > >> > > >> > > >> > _______________________________________________ > >> > Int-area mailing list > >> > Int-area@ietf.org > >> > https://www.ietf.org/mailman/listinfo/int-area > >> > > > > > > --000000000000f361500569add2e1 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Tom,
I'll let Frank answer your question as it = is on iOAM, not OOAM.

Regards,
Greg

On Thu, Ap= r 12, 2018 at 11:53 PM, Tom Herbert <tom@herbertland.com> = wrote:
On Thu, Apr 12, 2= 018 at 2:50 PM, Greg Mirsky <gr= egimirsky@gmail.com> wrote:
> Hi Tom,
> could you please mention which drafts, iOAM or OOAM, you refer to. Ple= ase
> note, that OOAM supports both active and hybrid OAM methods, while iOA= M only
> the latter.

Section 3 of draft-brockners-ippm-ioam-geneve-00 for instance.<= br>

>
> Regards,
> Greg
>
> On Thu, Apr 12, 2018 at 11:46 PM, Tom Herbert <tom@herbertland.com> wrote:
>>
>> On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky <gregimirsky@gmail.com>
>> wrote:
>> > Hi Frank,
>> > thank you for sharing your points. Please find my notes in-li= ne and
>> > tagged
>> > GIM>>. I believe that this is very much relevant to wor= k of other
>> > working
>> > groups that directly work on the overlay encapsulations in th= e center of
>> > the
>> > discussion and hence I've added them to the list. Hope we= 'll have more
>> > opinions to reach the conclusion that is acceptable to all. >> >
>> > Regards,
>> > Greg
>> >
>> > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne)<= br> >> > <fbrockne@cisco.com<= /a>> wrote:
>> >>
>> >> Back at the IPPM meeting in London, we discussed several = drafts dealing
>> >> with the encapsulation of IOAM data in various protocols<= br> >> >> (draft-brockners-ippm-ioam-vxlan-gpe-00,
>> >> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm= -ioam-gre-00). One
>> >> discussion topic that we decided to take to the list was = the question
>> >> on
>> >> whether draft-ooamdt-rtgwg-ooam-header could be leveraged= .=C2=A0 After
>> >> carefully
>> >> considering draft-ooamdt-rtgwg-ooam-header, I came t= o the conclusion
>> >> that
>> >> the =E2=80=9COOAM header=E2=80=9D does not meet the needs= of IOAM:
>> >>
>> >> * Efficiency: IOAM adds data to live user traffic. As suc= h, an
>> >> encapsulation needs to be as efficient as possible. The = =E2=80=9COOAM header=E2=80=9D
>> >> is 8
>> >> bytes long. The approach for IOAM data encapsulation in t= he above
>> >> mentioned
>> >> drafts only requires 4 bytes. Using the OOAM header appro= ach would add
>> >> an
>> >> unnecessary overhead of 4 bytes =E2=80=93 which is signif= icant.
>> Greg,
>>
>> I'm missing something here. I looked at the drafts you referen= ced and
>> each of them looks like the overhead for OAM is greater that four<= br> >> bytes. In each there is some overhead equivalent to type/length, f= or
>> instance in Geneve four bytes are needed for option class, type, a= nd
>> length. Unless the the OAM data is zero length, I don't see ho= w this
>> adds up to only four bytes of overhead.
>>
>> Tom
>>
>> >
>> > GIM>> The difference in four octets is because OOAM Hea= der:
>> >
>> > provides more flexibility, e.g. Flags field and Reserved fiel= ds;
>> > supports larger OAM packets than iOAM header;
>> > is future proof by supporting versioning (Version field).
>> >>
>> >> * Maturity: IOAM has several implementations, which were = also shown at
>> >> recent IETF hackathons =E2=80=93 and we=E2=80=99re expect= ing additional implementations
>> >> to
>> >> be publicized soon. Interoperable implementations need ti= mely
>> >> specifications. Despite the question being asked, the rec= ent thread on
>> >> OOAM
>> >> in the NVO3 list hasn=E2=80=99t revealed any implementati= on of the OOAM header.
>> >> In
>> >> addition, the thread revealed that several fundamental qu= estions about
>> >> the
>> >> OOAM header are still open, such as whether or how active= OAM
>> >> mechanisms
>> >> within protocols such as Geneve would apply to the OOAM h= eader. This
>> >> ultimately means that we won=E2=80=99t get to a timely sp= ecification.
>> >
>> > GIM>> May I ask which encapsulations supported by the i= mplementations
>> > you
>> > refer to. Until very recently all iOAM proposals were to use = meta-data
>> > TLV
>> > in, e.g. Geneve and NSH. And if these or some of these implem= entations
>> > already updated to the newly proposed iOAM shim, I don't = see problem in
>> > making them use OOAM Header. Would you agree?
>> >
>> >>
>> >> * Scope: It isn=E2=80=99t entirely clear to which protoco= ls the OOAM header
>> >> would
>> >> ultimately apply to. The way the OOAM header is defined, = OOAM uses a
>> >> 8-bit
>> >> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol.= Some protocols that IOAM data
>> >> needs to be encapsulated into use 16-bits for their next = protocol code
>> >> points. See e.g. the GRE encapsulation =E2=80=93 as speci= fied in
>> >> draft-weis-ippm-ioam-gre-00.
>> >
>> > GIM>> The first paragraph of the Introduction section s= tates:
>> >=C2=A0 =C2=A0 New protocols that support overlay networks like= VxLAN-GPE
>> >=C2=A0 =C2=A0 [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gu= e], Geneve
>> >=C2=A0 =C2=A0 [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls= -encapsulation], and
>> >=C2=A0 =C2=A0 NSH [I-D.ietf-sfc-nsh] support multi-protocol pa= yload, e.g.
>> >=C2=A0 =C2=A0 Ethernet, IPv4/IPv6, and recognize Operations, A= dministration, and
>> >=C2=A0 =C2=A0 Maintenance (OAM) as one of distinct types.=C2= =A0 That ensures that
>> >=C2=A0 =C2=A0 Overlay OAM (OOAM)packets are sharing fate with = Overlay data packet
>> >=C2=A0 =C2=A0 traversing the underlay.
>> > I'm updating the OOAM Header draft and along with cleanin= g nits will
>> > update
>> > reference to GUE. I think that the list and the statemnt are = quite clear
>> > in
>> > identifying the scope of networks that may benefit from using= not only
>> > common OOAM Header but common OOAM mechanisms, e.g. Echo Requ= est/Reply.
>> >
>> >> With the above in mind, I=E2=80=99d suggest that the WG m= oves forward with
>> >> specific definitions for encapsulating IOAM data into pro= tocols =E2=80=93 per
>> >> the
>> >> above mentioned drafts.
>> >>
>> >>
>> >>
>> >> Regards, Frank
>> >>
>> >>
>> >> _______________________________________________
>> >> ippm mailing list
>> >> ippm@ietf.org
>> >> https://www.ietf.org/mailman/listin= fo/ippm
>> >>
>> >
>> >
>> > _______________________________________________
>> > Int-area mailing list
>> > Int-area@ietf.org >> > https://www.ietf.org/mailman/listin= fo/int-area
>> >
>
>

--000000000000f361500569add2e1-- From nobody Thu Apr 12 15:31:32 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C061A12D869 for ; Thu, 12 Apr 2018 15:31:29 -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); dkim=pass (1024-bit key) header.d=barefootnetworks.com 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 comSVeoiAKOq for ; Thu, 12 Apr 2018 15:31:26 -0700 (PDT) Received: from mail-wr0-x229.google.com (mail-wr0-x229.google.com [IPv6:2a00:1450:400c:c0c::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 727C712D80E for ; Thu, 12 Apr 2018 15:31:25 -0700 (PDT) Received: by mail-wr0-x229.google.com with SMTP id d1so6532955wrj.13 for ; Thu, 12 Apr 2018 15:31:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=barefootnetworks.com; s=google; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=54fnwtVPrwRb9rLy95TfyEXvvXzYtbfPiSi8aJiMycA=; b=G6raDS4nGG5+zIB3DHP6bBsYaJFPmsdTdZfh8CqyO/LR/UcyLkncV7STkN/aBPGH4X PLnkbFQ3Hu9tolh93A5FVtjW0gDWHs0VS66k/W9/Pkqg1zeCJozzfOGvq1/71yXyoEVe g2lA8lhT6K1SXKiLBugXs22CmnqhkZJdQd1NA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=54fnwtVPrwRb9rLy95TfyEXvvXzYtbfPiSi8aJiMycA=; b=oXOlrjdY3bH8Fbg0a4UrEGyUJLknDgt0yoyASPnwpQWlqpnnh+jjHT5K9RSCLXLOfA ong4W9k28r3I4ps3RIa0oYZzVvLJz72n1JCFKfMnrZBwwbu7kBSEMr4yKHYNwOEDt22v ETfUo0BtKIYQm9WFlHFCEtpGxMOTpjnry8JFjpQ/F8kHiTuwLOqc+IkM0+7Erhz+eOpX soczTBTexknbWTWuxhg9FVjWpJ1HwsXDdemlbFnNOE1MywMn/BqI8SYWxqQ2PP563tyx t+kEzmgkF5j4K34D3s7Wpns4QffmjUEBVCbeujjoeV/JkFQK35coUvk4xqdP7+ocgue2 Aziw== X-Gm-Message-State: ALQs6tCvHwq4L6hdqyGfAzsOXflgSUqBG+cGCt4QrwUUmW9fgVVS0Tep RMq1qQfLb5GAt+Onx7k50cg8fG9j3XceJmUisAE3TA== X-Google-Smtp-Source: AIpwx4+eLDKIGQxjZRAaG80LdP85NiHvdm4LuSmGPskfUsqyfzXZFkTG4ETEjtl8kEePaIIo8zWeVth4I9NA/WnDWqw= X-Received: by 10.223.144.227 with SMTP id i90mr1978840wri.100.1523572283950; Thu, 12 Apr 2018 15:31:23 -0700 (PDT) MIME-Version: 1.0 Received: by 10.223.148.33 with HTTP; Thu, 12 Apr 2018 15:31:23 -0700 (PDT) In-Reply-To: References: From: Mickey Spiegel Date: Thu, 12 Apr 2018 15:31:23 -0700 Message-ID: To: Tom Herbert Cc: Greg Mirsky , NVO3 , int-area@ietf.org, Service Function Chaining IETF list , IETF IPPM WG Content-Type: multipart/alternative; boundary="94eb2c05f484c65ef90569ae5045" Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Apr 2018 22:31:30 -0000 --94eb2c05f484c65ef90569ae5045 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Tom, On Thu, Apr 12, 2018 at 2:46 PM, Tom Herbert wrote: > On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky > wrote: > > Hi Frank, > > thank you for sharing your points. Please find my notes in-line and > tagged > > GIM>>. I believe that this is very much relevant to work of other worki= ng > > groups that directly work on the overlay encapsulations in the center o= f > the > > discussion and hence I've added them to the list. Hope we'll have more > > opinions to reach the conclusion that is acceptable to all. > > > > Regards, > > Greg > > > > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) > > wrote: > >> > >> Back at the IPPM meeting in London, we discussed several drafts dealin= g > >> with the encapsulation of IOAM data in various protocols > >> (draft-brockners-ippm-ioam-vxlan-gpe-00, > >> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). One > >> discussion topic that we decided to take to the list was the question = on > >> whether draft-ooamdt-rtgwg-ooam-header could be leveraged. After > carefully > >> considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusion > that > >> the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM: > >> > >> * Efficiency: IOAM adds data to live user traffic. As such, an > >> encapsulation needs to be as efficient as possible. The =E2=80=9COOAM = header=E2=80=9D > is 8 > >> bytes long. The approach for IOAM data encapsulation in the above > mentioned > >> drafts only requires 4 bytes. Using the OOAM header approach would add > an > >> unnecessary overhead of 4 bytes =E2=80=93 which is significant. > Greg, > > I'm missing something here. I looked at the drafts you referenced and > each of them looks like the overhead for OAM is greater that four > bytes. In each there is some overhead equivalent to type/length, for > instance in Geneve four bytes are needed for option class, type, and > length. Unless the the OAM data is zero length, I don't see how this > adds up to only four bytes of overhead. > The four versus eight bytes just refers to the fields in the four bytes of IOAM info, that is common to all IOAM options. Beyond that, there are IOAM optio= n specific fields. For example if doing one of the IOAM trace options, there are four bytes of trace option header, including the IOAM-trace-type, NodeLen, Flags, and RemainingLen fields. These are followed by the node data list containing the per hop IOAM information. In looking at the OOAM header content, it has nothing to do with any of the IOAM information after the first four bytes. It contains another variant of the information in the first four bytes of IOAM info, spread out over eight bytes. > Tom > > > > > GIM>> The difference in four octets is because OOAM Header: > > > > provides more flexibility, e.g. Flags field and Reserved fields; > The flags field only has one defined flag at the moment, for a timestamp block. For IOAM trace we need per hop timestamps, which the timestamp block cannot address, i.e. the timestamp block is redundant for IOAM. > > supports larger OAM packets than iOAM header; > For IOAM purposes, 1020 octets is more than enough. > > is future proof by supporting versioning (Version field). > IMO, taking the first two bits of the IOAM-Type to define a Version field would be a good thing. This does not require adding four more bytes of overhead. 64 IOAM-Types is more than enough. > >> > >> * Maturity: IOAM has several implementations, which were also shown at > >> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting additiona= l implementations > to > >> be publicized soon. Interoperable implementations need timely > >> specifications. Despite the question being asked, the recent thread on > OOAM > >> in the NVO3 list hasn=E2=80=99t revealed any implementation of the OOA= M header. > In > >> addition, the thread revealed that several fundamental questions about > the > >> OOAM header are still open, such as whether or how active OAM mechanis= ms > >> within protocols such as Geneve would apply to the OOAM header. This > >> ultimately means that we won=E2=80=99t get to a timely specification. > > > > GIM>> May I ask which encapsulations supported by the implementations y= ou > > refer to. Until very recently all iOAM proposals were to use meta-data > TLV > > in, e.g. Geneve and NSH. And if these or some of these implementations > > already updated to the newly proposed iOAM shim, I don't see problem in > > making them use OOAM Header. Would you agree? > > > >> > >> * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM h= eader > would > >> ultimately apply to. The way the OOAM header is defined, OOAM uses a > 8-bit > >> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protoco= ls that IOAM data > >> needs to be encapsulated into use 16-bits for their next protocol code > >> points. See e.g. the GRE encapsulation =E2=80=93 as specified in > >> draft-weis-ippm-ioam-gre-00. > > > > GIM>> The first paragraph of the Introduction section states: > > New protocols that support overlay networks like VxLAN-GPE > > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve > > [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], and > > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. > > Ethernet, IPv4/IPv6, and recognize Operations, Administration, and > > Maintenance (OAM) as one of distinct types. That ensures that > > Overlay OAM (OOAM)packets are sharing fate with Overlay data packet > > traversing the underlay. > > I'm updating the OOAM Header draft and along with cleaning nits will > update > > reference to GUE. I think that the list and the statemnt are quite clea= r > in > > identifying the scope of networks that may benefit from using not only > > common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply. > > > >> With the above in mind, I=E2=80=99d suggest that the WG moves forward = with > >> specific definitions for encapsulating IOAM data into protocols =E2=80= =93 per > the > >> above mentioned drafts. > >> > >> > >> > >> Regards, Frank > >> > >> > >> _______________________________________________ > >> ippm mailing list > >> ippm@ietf.org > >> https://www.ietf.org/mailman/listinfo/ippm > >> > > > > > > _______________________________________________ > > Int-area mailing list > > Int-area@ietf.org > > https://www.ietf.org/mailman/listinfo/int-area > > > > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://www.ietf.org/mailman/listinfo/ippm > --94eb2c05f484c65ef90569ae5045 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Tom,

On Thu, Apr 12, 2018 at 2:46 PM, Tom Herbert <= ;tom@herbertland.c= om> wrote:
On Thu,= Apr 12, 2018 at 9:54 AM, Greg Mirsky <gregimirsky@gmail.com> wrote:
> Hi Frank,
> thank you for sharing your points. Please find my notes in-line and ta= gged
> GIM>>. I believe that this is very much relevant to work of othe= r working
> groups that directly work on the overlay encapsulations in the center = of the
> discussion and hence I've added them to the list. Hope we'll h= ave more
> opinions to reach the conclusion that is acceptable to all.
>
> Regards,
> Greg
>
> On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne)
> <fbrockne@cisco.com> w= rote:
>>
>> Back at the IPPM meeting in London, we discussed several drafts de= aling
>> with the encapsulation of IOAM data in various protocols
>> (draft-brockners-ippm-ioam-vxlan-gpe-00,
>> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre= -00). One
>> discussion topic that we decided to take to the list was the quest= ion on
>> whether draft-ooamdt-rtgwg-ooam-header could be leveraged.=C2=A0 A= fter carefully
>> considering draft-ooamdt-rtgwg-ooam-header, I came to the con= clusion that
>> the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM:=
>>
>> * Efficiency: IOAM adds data to live user traffic. As such, an
>> encapsulation needs to be as efficient as possible. The =E2=80=9CO= OAM header=E2=80=9D is 8
>> bytes long. The approach for IOAM data encapsulation in the above = mentioned
>> drafts only requires 4 bytes. Using the OOAM header approach would= add an
>> unnecessary overhead of 4 bytes =E2=80=93 which is significant. Greg,

I'm missing something here. I looked at the drafts you referenced and each of them looks like the overhead for OAM is greater that four
bytes. In each there is some overhead equivalent to type/length, for
instance in Geneve four bytes are needed for option class, type, and
length. Unless the the OAM data is zero length, I don't see how this adds up to only four bytes of overhead.

The four versus eight bytes just refers to the fields in the four bytes of= IOAM
info, that is common to all IOAM options. Beyond that, ther= e are IOAM option
specific fields. For example if doing one of th= e IOAM trace options, there are
four bytes of trace option header= , including the IOAM-trace-type, NodeLen,
Flags, and RemainingLen= fields. These are followed by the node data list
containing the = per hop IOAM information.

In looking at the OOAM h= eader content, it has nothing to do with any of the
IOAM informat= ion after the first four bytes. It contains another variant of the
information in the first four bytes of IOAM info, spread out over eight b= ytes.


Tom

>
> GIM>> The difference in four octets is because OOAM Header:
>
> provides more flexibility, e.g. Flags field and Reserved fields;

The flags field only has one def= ined flag at the moment, for a timestamp
block. For IOAM trace we= need per hop timestamps, which the timestamp
block cannot addres= s, i.e. the timestamp block is redundant for IOAM.
=C2=A0
> supports larger OAM packets than iOAM header;

For IOAM purposes, 1020 octets is more than enough.=
=C2=A0
> is future proof by supporting versioning (Version field).

IMO, taking the first two bits of the I= OAM-Type to define a Version field
would be a good thing. This do= es not require adding four more bytes of
overhead. 64 IOAM-Types = is more than enough.
=C2=A0
>>
>> * Maturity: IOAM has several implementations, which were also show= n at
>> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting addit= ional implementations to
>> be publicized soon. Interoperable implementations need timely
>> specifications. Despite the question being asked, the recent threa= d on OOAM
>> in the NVO3 list hasn=E2=80=99t revealed any implementation of the= OOAM header. In
>> addition, the thread revealed that several fundamental questions a= bout the
>> OOAM header are still open, such as whether or how active OAM mech= anisms
>> within protocols such as Geneve would apply to the OOAM header. Th= is
>> ultimately means that we won=E2=80=99t get to a timely specificati= on.
>
> GIM>> May I ask which encapsulations supported by the implementa= tions you
> refer to. Until very recently all iOAM proposals were to use meta-data= TLV
> in, e.g. Geneve and NSH. And if these or some of these implementations=
> already updated to the newly proposed iOAM shim, I don't see probl= em in
> making them use OOAM Header. Would you agree?
>
>>
>> * Scope: It isn=E2=80=99t entirely clear to which protocols the OO= AM header would
>> ultimately apply to. The way the OOAM header is defined, OOAM uses= a 8-bit
>> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some pro= tocols that IOAM data
>> needs to be encapsulated into use 16-bits for their next protocol = code
>> points. See e.g. the GRE encapsulation =E2=80=93 as specified in >> draft-weis-ippm-ioam-gre-00.
>
> GIM>> The first paragraph of the Introduction section states: >=C2=A0 =C2=A0 New protocols that support overlay networks like VxLAN-GP= E
>=C2=A0 =C2=A0 [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Genev= e
>=C2=A0 =C2=A0 [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-enc= apsulation], and
>=C2=A0 =C2=A0 NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.= g.
>=C2=A0 =C2=A0 Ethernet, IPv4/IPv6, and recognize Operations, Administra= tion, and
>=C2=A0 =C2=A0 Maintenance (OAM) as one of distinct types.=C2=A0 That en= sures that
>=C2=A0 =C2=A0 Overlay OAM (OOAM)packets are sharing fate with Overlay d= ata packet
>=C2=A0 =C2=A0 traversing the underlay.
> I'm updating the OOAM Header draft and along with cleaning nits wi= ll update
> reference to GUE. I think that the list and the statemnt are quite cle= ar in
> identifying the scope of networks that may benefit from using not only=
> common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply= .
>
>> With the above in mind, I=E2=80=99d suggest that the WG moves forw= ard with
>> specific definitions for encapsulating IOAM data into protocols = =E2=80=93 per the
>> above mentioned drafts.
>>
>>
>>
>> Regards, Frank
>>
>>
>> _______________________________________________
>> ippm mailing list
>> ippm@ietf.org
>> https://www.ietf.org/mailman/listinfo/ippm
>>
>
>
> ____________________= ___________________________
> Int-area mailing list
> Int-area@ietf.org
> https://www.ietf.org/mailman/listinfo/int-ar= ea
>

________________= _______________________________
ippm mailing list
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https://www.ietf.org/mailman/listinfo/ippm

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data in various protocols - follow up from WG discussion in London Thread-Index: AQHT0okELCmwkoTjo0K66ruEREJj4qP96ksAgABI4oA= Date: Fri, 13 Apr 2018 01:56:12 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.118.116.133] Content-Type: multipart/alternative; boundary="_000_EE1ADA61140548C5970E8CF283EC62D0ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [nvo3] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Apr 2018 01:56:19 -0000 --_000_EE1ADA61140548C5970E8CF283EC62D0ciscocom_ Content-Type: text/plain; charset="utf-8" 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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=herbertland-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=ksBHtLdNGXziLcuCu1JGz+HWauYOEG3mn/WbUgjtu6g=; b=W1+qe6agQW1b0s4i9dW91EHClvDUb3pW5INHTnaeO7k/MlUtS9lOEle+YxTDaZfDnC 2fj203nWTeKbpBQ2QEtGnNCAkAEbxvGH+iB5Jo6OzYlkcAJ4WsGwuD9yjjlFqwPiqo4u LKJhxCEcCBE3fofDH2a9p/YwwapQ0UYkwZPOkzJmZMdp0g8KsjT8MWjkUQXT5Baw+O8N PAtAHp8ATLLObCi+Fj3wI7xw/GK2BpaYmAW8I8INbsVA/EYtBPG5SJOwkyRp23NrFUK8 2GA3t11ETGom8+g9Ib2tr5RH7DtuLNstTtXEY1i/HgwidecSa4rNZarW+ankYESelpe6 UM9g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=ksBHtLdNGXziLcuCu1JGz+HWauYOEG3mn/WbUgjtu6g=; b=JZ3n5X1HKna9vqSMV1qA7w8cKthPS6391PtrGZgbw+SMfsp4eAgsNO5eBWnB2s9CDS 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Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Apr 2018 01:59:46 -0000 On Thu, Apr 12, 2018 at 3:31 PM, Mickey Spiegel wrote: > Tom, > > On Thu, Apr 12, 2018 at 2:46 PM, Tom Herbert wrote: >> >> On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky >> wrote: >> > Hi Frank, >> > thank you for sharing your points. Please find my notes in-line and >> > tagged >> > GIM>>. I believe that this is very much relevant to work of other >> > working >> > groups that directly work on the overlay encapsulations in the center = of >> > the >> > discussion and hence I've added them to the list. Hope we'll have more >> > opinions to reach the conclusion that is acceptable to all. >> > >> > Regards, >> > Greg >> > >> > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) >> > wrote: >> >> >> >> Back at the IPPM meeting in London, we discussed several drafts deali= ng >> >> with the encapsulation of IOAM data in various protocols >> >> (draft-brockners-ippm-ioam-vxlan-gpe-00, >> >> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). On= e >> >> discussion topic that we decided to take to the list was the question >> >> on >> >> whether draft-ooamdt-rtgwg-ooam-header could be leveraged. After >> >> carefully >> >> considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusion >> >> that >> >> the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM: >> >> >> >> * Efficiency: IOAM adds data to live user traffic. As such, an >> >> encapsulation needs to be as efficient as possible. The =E2=80=9COOAM= header=E2=80=9D >> >> is 8 >> >> bytes long. The approach for IOAM data encapsulation in the above >> >> mentioned >> >> drafts only requires 4 bytes. Using the OOAM header approach would ad= d >> >> an >> >> unnecessary overhead of 4 bytes =E2=80=93 which is significant. >> Greg, >> >> I'm missing something here. I looked at the drafts you referenced and >> each of them looks like the overhead for OAM is greater that four >> bytes. In each there is some overhead equivalent to type/length, for >> instance in Geneve four bytes are needed for option class, type, and >> length. Unless the the OAM data is zero length, I don't see how this >> adds up to only four bytes of overhead. > > > The four versus eight bytes just refers to the fields in the four bytes o= f > IOAM > info, that is common to all IOAM options. Beyond that, there are IOAM opt= ion > specific fields. For example if doing one of the IOAM trace options, ther= e > are > four bytes of trace option header, including the IOAM-trace-type, NodeLen= , > Flags, and RemainingLen fields. These are followed by the node data list > containing the per hop IOAM information. > All of that and people are worried about having four extra bytes of overhead? :-) How big are these encapsulation headers in data packets going to be? Tom > In looking at the OOAM header content, it has nothing to do with any of t= he > IOAM information after the first four bytes. It contains another variant = of > the > information in the first four bytes of IOAM info, spread out over eight > bytes. > >> >> Tom >> >> > >> > GIM>> The difference in four octets is because OOAM Header: >> > >> > provides more flexibility, e.g. Flags field and Reserved fields; > > > The flags field only has one defined flag at the moment, for a timestamp > block. For IOAM trace we need per hop timestamps, which the timestamp > block cannot address, i.e. the timestamp block is redundant for IOAM. > >> >> > supports larger OAM packets than iOAM header; > > > For IOAM purposes, 1020 octets is more than enough. > >> >> > is future proof by supporting versioning (Version field). > > > IMO, taking the first two bits of the IOAM-Type to define a Version field > would be a good thing. This does not require adding four more bytes of > overhead. 64 IOAM-Types is more than enough. > >> >> >> >> >> * Maturity: IOAM has several implementations, which were also shown a= t >> >> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting addition= al implementations >> >> to >> >> be publicized soon. Interoperable implementations need timely >> >> specifications. Despite the question being asked, the recent thread o= n >> >> OOAM >> >> in the NVO3 list hasn=E2=80=99t revealed any implementation of the OO= AM header. >> >> In >> >> addition, the thread revealed that several fundamental questions abou= t >> >> the >> >> OOAM header are still open, such as whether or how active OAM >> >> mechanisms >> >> within protocols such as Geneve would apply to the OOAM header. This >> >> ultimately means that we won=E2=80=99t get to a timely specification. >> > >> > GIM>> May I ask which encapsulations supported by the implementations >> > you >> > refer to. Until very recently all iOAM proposals were to use meta-data >> > TLV >> > in, e.g. Geneve and NSH. And if these or some of these implementations >> > already updated to the newly proposed iOAM shim, I don't see problem i= n >> > making them use OOAM Header. Would you agree? >> > >> >> >> >> * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM = header >> >> would >> >> ultimately apply to. The way the OOAM header is defined, OOAM uses a >> >> 8-bit >> >> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protoc= ols that IOAM data >> >> needs to be encapsulated into use 16-bits for their next protocol cod= e >> >> points. See e.g. the GRE encapsulation =E2=80=93 as specified in >> >> draft-weis-ippm-ioam-gre-00. >> > >> > GIM>> The first paragraph of the Introduction section states: >> > New protocols that support overlay networks like VxLAN-GPE >> > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve >> > [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], an= d >> > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. >> > Ethernet, IPv4/IPv6, and recognize Operations, Administration, and >> > Maintenance (OAM) as one of distinct types. That ensures that >> > Overlay OAM (OOAM)packets are sharing fate with Overlay data packet >> > traversing the underlay. >> > I'm updating the OOAM Header draft and along with cleaning nits will >> > update >> > reference to GUE. I think that the list and the statemnt are quite cle= ar >> > in >> > identifying the scope of networks that may benefit from using not only >> > common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply= . >> > >> >> With the above in mind, I=E2=80=99d suggest that the WG moves forward= with >> >> specific definitions for encapsulating IOAM data into protocols =E2= =80=93 per >> >> the >> >> above mentioned drafts. >> >> >> >> >> >> >> >> Regards, Frank >> >> >> >> >> >> _______________________________________________ >> >> ippm mailing list >> >> ippm@ietf.org >> >> https://www.ietf.org/mailman/listinfo/ippm >> >> >> > >> > >> > _______________________________________________ >> > Int-area mailing list >> > Int-area@ietf.org >> > https://www.ietf.org/mailman/listinfo/int-area >> > >> >> _______________________________________________ >> ippm mailing list >> ippm@ietf.org >> https://www.ietf.org/mailman/listinfo/ippm > > From nobody Thu Apr 12 22:17:32 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D75D7124239 for ; Thu, 12 Apr 2018 22:17:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.91 X-Spam-Level: X-Spam-Status: No, score=-1.91 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_DKIMWL_WL_MED=-0.01] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=herbertland-com.20150623.gappssmtp.com 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 xycg8ZNUPSWs for ; Thu, 12 Apr 2018 22:17:23 -0700 (PDT) Received: from mail-yb0-x233.google.com (mail-yb0-x233.google.com [IPv6:2607:f8b0:4002:c09::233]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E2746127599 for ; Thu, 12 Apr 2018 22:17:22 -0700 (PDT) Received: by mail-yb0-x233.google.com with SMTP id b14-v6so3701620ybk.1 for ; Thu, 12 Apr 2018 22:17:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=herbertland-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=sUmey24NZdS7vfnHRBWjRaLNzCpVoPI2x+yXlWUbWgA=; b=Sbm6QGbIawbJzWx7UNYmgBvxSZuW7D2NG2Dj85FMiWhkw3CBaYNXCb8PSZhedyDrnP WmmK+FWmZ6Z1YscCuEc0iQCLtcSqAnO2IhD+2U9zj+EaZx373vzNf8EYifZtCUk5Ss6l TGfcExFJnlT6ST1jLzHTox12j7+83MNd20bamJnObMcRI3lnIV9EEHzy1GejN8Pfgc/H DaqIESm8YLnzraTx38IntZ/Z/q0lI67qOWse7o/1HyvB4nLL1YVVK7QS/5cdIsoNWiUS MLNgc/a91kzbIfcGLAO6TwPaCkeyuldljpWwBFSWLn3v/C6x+1mmwMKecOsoArij5vZa 4mkQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=sUmey24NZdS7vfnHRBWjRaLNzCpVoPI2x+yXlWUbWgA=; b=ccPI0SIsF+xGpoFxwdciyQVNtifV7SJpWCXXmPJvMum2lYXcExk0R2KVqOkLgTwm7f mt/QenmDA3odoTXGStK3gomsgWaa/jqJc8HR2DNdqn1naguEnD5JXdx457IqeXSJ8sui llaSob4vMwKhs/f5r55rarx9oDJfhqq2qCcJ+PRH7+1b4Xf0LcGrHhdA4jjl5AXCFYHs +Dgd3ekMwyuT4+1Of5CBN8d3646rV/OIZ1Xf6Xheal8Fek9FE8yZmZnC4SqA6ZRNkk1G nYM9mk+vNd9VCp+VOA99EmR95+Ux7g4IqJMDIXqm6nD34TW/fWkM3lT+u28BPxwz4e79 0W6g== X-Gm-Message-State: ALQs6tBpayrOM03j9tEQvKcaoZQ3mHi0+JecPU0zBIgStKWj8inF5Hdi rOugJHcDmK+rSdkUjfI+9tkEg9qdOruwI57pKYXrIA== X-Google-Smtp-Source: AIpwx4/SbrRovuGFyKUCHjips16i6iURR+Xa6tK4aC++49FkJBFBp0fDJYzYeQgh6YrRxb4HJyT4ilnvfODeCZV6+Y4= X-Received: by 2002:a25:b2a3:: with SMTP id k35-v6mr3203144ybj.259.1523596641773; Thu, 12 Apr 2018 22:17:21 -0700 (PDT) MIME-Version: 1.0 Received: by 10.200.26.135 with HTTP; Thu, 12 Apr 2018 22:17:21 -0700 (PDT) In-Reply-To: References: From: Tom Herbert Date: Thu, 12 Apr 2018 22:17:21 -0700 Message-ID: To: Mickey Spiegel Cc: Greg Mirsky , NVO3 , int-area@ietf.org, Service Function Chaining IETF list , IETF IPPM WG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Apr 2018 05:17:27 -0000 Mickey, Looking at these ippm drafts more closely, I have a much more fundamental concern. In draft-brockners-ippm-ioam-geneve-00 for instance, there is the text in the introduction: "In-situ OAM (IOAM) records OAM information within the packet while the packet traverses a particular network domain. The term "in-situ" refers to the fact that the IOAM data fields are added to the data packets rather than is being sent within packets specifically dedicated to OAM. This document defines how IOAM data fields are transported as part of the Geneve [I-D.ietf-nvo3-geneve] encapsulation." I assume this means that as packets with Geneve encapsulation traverse the network they are interpreted by intermediate nodes as being Geneve. Since Geneve is a UDP encapsulation, then the destination UDP port number would be used to identify packets as being Geneve. So an intermediate device might be looking for UDP packets destined to port 6081 (the assigned UDP port for Geneve). If my understanding is correct, then this is a problem. UDP port numbers do not have global meaning. An intermediate device may very well see UDP packets destined to port 6081 that are not actually Geneve. This scenario is discussed in RFC7605: "...intermediate device interprets traffic based on the port number. It is important to recognize that any interpretation of port numbers -- except at the endpoints -- may be incorrect, because port numbers are meaningful only at the endpoints." If the UDP data is modified, as the draft would imply, then misinterpretation may also mean silent data corruption of packets. A protocol that would allow this seems pretty incorrect! Note that this would be true also for any UDP encapsulation that the network tries to interpret. I am also wondering if hop-by-hop options been considered for this application? Their interpretation in the network is unabiguous and they also have the advantage that the work with any IP protocol or encapsulation. Thanks, Tom On Thu, Apr 12, 2018 at 3:31 PM, Mickey Spiegel wrote: > Tom, > > On Thu, Apr 12, 2018 at 2:46 PM, Tom Herbert wrote: >> >> On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky >> wrote: >> > Hi Frank, >> > thank you for sharing your points. Please find my notes in-line and >> > tagged >> > GIM>>. I believe that this is very much relevant to work of other >> > working >> > groups that directly work on the overlay encapsulations in the center = of >> > the >> > discussion and hence I've added them to the list. Hope we'll have more >> > opinions to reach the conclusion that is acceptable to all. >> > >> > Regards, >> > Greg >> > >> > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) >> > wrote: >> >> >> >> Back at the IPPM meeting in London, we discussed several drafts deali= ng >> >> with the encapsulation of IOAM data in various protocols >> >> (draft-brockners-ippm-ioam-vxlan-gpe-00, >> >> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). On= e >> >> discussion topic that we decided to take to the list was the question >> >> on >> >> whether draft-ooamdt-rtgwg-ooam-header could be leveraged. After >> >> carefully >> >> considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusion >> >> that >> >> the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM: >> >> >> >> * Efficiency: IOAM adds data to live user traffic. As such, an >> >> encapsulation needs to be as efficient as possible. The =E2=80=9COOAM= header=E2=80=9D >> >> is 8 >> >> bytes long. The approach for IOAM data encapsulation in the above >> >> mentioned >> >> drafts only requires 4 bytes. Using the OOAM header approach would ad= d >> >> an >> >> unnecessary overhead of 4 bytes =E2=80=93 which is significant. >> Greg, >> >> I'm missing something here. I looked at the drafts you referenced and >> each of them looks like the overhead for OAM is greater that four >> bytes. In each there is some overhead equivalent to type/length, for >> instance in Geneve four bytes are needed for option class, type, and >> length. Unless the the OAM data is zero length, I don't see how this >> adds up to only four bytes of overhead. > > > The four versus eight bytes just refers to the fields in the four bytes o= f > IOAM > info, that is common to all IOAM options. Beyond that, there are IOAM opt= ion > specific fields. For example if doing one of the IOAM trace options, ther= e > are > four bytes of trace option header, including the IOAM-trace-type, NodeLen= , > Flags, and RemainingLen fields. These are followed by the node data list > containing the per hop IOAM information. > > In looking at the OOAM header content, it has nothing to do with any of t= he > IOAM information after the first four bytes. It contains another variant = of > the > information in the first four bytes of IOAM info, spread out over eight > bytes. > >> >> Tom >> >> > >> > GIM>> The difference in four octets is because OOAM Header: >> > >> > provides more flexibility, e.g. Flags field and Reserved fields; > > > The flags field only has one defined flag at the moment, for a timestamp > block. For IOAM trace we need per hop timestamps, which the timestamp > block cannot address, i.e. the timestamp block is redundant for IOAM. > >> >> > supports larger OAM packets than iOAM header; > > > For IOAM purposes, 1020 octets is more than enough. > >> >> > is future proof by supporting versioning (Version field). > > > IMO, taking the first two bits of the IOAM-Type to define a Version field > would be a good thing. This does not require adding four more bytes of > overhead. 64 IOAM-Types is more than enough. > >> >> >> >> >> * Maturity: IOAM has several implementations, which were also shown a= t >> >> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting addition= al implementations >> >> to >> >> be publicized soon. Interoperable implementations need timely >> >> specifications. Despite the question being asked, the recent thread o= n >> >> OOAM >> >> in the NVO3 list hasn=E2=80=99t revealed any implementation of the OO= AM header. >> >> In >> >> addition, the thread revealed that several fundamental questions abou= t >> >> the >> >> OOAM header are still open, such as whether or how active OAM >> >> mechanisms >> >> within protocols such as Geneve would apply to the OOAM header. This >> >> ultimately means that we won=E2=80=99t get to a timely specification. >> > >> > GIM>> May I ask which encapsulations supported by the implementations >> > you >> > refer to. Until very recently all iOAM proposals were to use meta-data >> > TLV >> > in, e.g. Geneve and NSH. And if these or some of these implementations >> > already updated to the newly proposed iOAM shim, I don't see problem i= n >> > making them use OOAM Header. Would you agree? >> > >> >> >> >> * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM = header >> >> would >> >> ultimately apply to. The way the OOAM header is defined, OOAM uses a >> >> 8-bit >> >> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protoc= ols that IOAM data >> >> needs to be encapsulated into use 16-bits for their next protocol cod= e >> >> points. See e.g. the GRE encapsulation =E2=80=93 as specified in >> >> draft-weis-ippm-ioam-gre-00. >> > >> > GIM>> The first paragraph of the Introduction section states: >> > New protocols that support overlay networks like VxLAN-GPE >> > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve >> > [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], an= d >> > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. >> > Ethernet, IPv4/IPv6, and recognize Operations, Administration, and >> > Maintenance (OAM) as one of distinct types. That ensures that >> > Overlay OAM (OOAM)packets are sharing fate with Overlay data packet >> > traversing the underlay. >> > I'm updating the OOAM Header draft and along with cleaning nits will >> > update >> > reference to GUE. I think that the list and the statemnt are quite cle= ar >> > in >> > identifying the scope of networks that may benefit from using not only >> > common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply= . >> > >> >> With the above in mind, I=E2=80=99d suggest that the WG moves forward= with >> >> specific definitions for encapsulating IOAM data into protocols =E2= =80=93 per >> >> the >> >> above mentioned drafts. >> >> >> >> >> >> >> >> Regards, Frank >> >> >> >> >> >> _______________________________________________ >> >> ippm mailing list >> >> ippm@ietf.org >> >> https://www.ietf.org/mailman/listinfo/ippm >> >> >> > >> > >> > _______________________________________________ >> > Int-area mailing list >> > Int-area@ietf.org >> > https://www.ietf.org/mailman/listinfo/int-area >> > >> >> _______________________________________________ >> ippm mailing list >> ippm@ietf.org >> https://www.ietf.org/mailman/listinfo/ippm > > From nobody Thu Apr 12 22:27:38 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D6AB812D7F8; 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Thu, 12 Apr 2018 22:27:32 -0700 (PDT) Received: from [172.20.7.162] ([46.218.58.220]) by smtp.gmail.com with ESMTPSA id t196sm1340850wme.35.2018.04.12.22.27.31 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 12 Apr 2018 22:27:31 -0700 (PDT) Content-Type: multipart/alternative; boundary=Apple-Mail-269A483E-D001-4EF2-BC0F-DC78DE9FC742 Mime-Version: 1.0 (1.0) From: Stewart Bryant X-Mailer: iPad Mail (15D100) In-Reply-To: <09337fcf-64c9-450c-8dbc-ba8330611fe4.xiaohu.xxh@alibaba-inc.com> Date: Fri, 13 Apr 2018 07:27:30 +0200 Cc: mpls , "Bernier, Daniel" , Robert Raszuk , "mpls@ietf.org" , "sfc@ietf.org" Content-Transfer-Encoding: 7bit Message-Id: <6EE25554-3714-4A75-896F-24CC89BAA807@gmail.com> References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <1522554645079.8864@bell.ca> <1522812352107.5966@bell.ca> <489a9667-f159-4607-5834-b4bacf64989c@gmail.com> <09337fcf-64c9-450c-8dbc-ba8330611fe4.xiaohu.xxh@alibaba-inc.com> To: =?utf-8?B?IuW+kOWwj+iZjijkuYnlhYgpIg==?= Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Apr 2018 05:27:37 -0000 --Apple-Mail-269A483E-D001-4EF2-BC0F-DC78DE9FC742 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Xiaohu What an earlier version of the draft said is of no importance. What it says g= oing forward is what counts. Perhaps the way to address your concern is to include some text of the form t= hat I used in my email of yesterday to describe to the reader the difference= in approach. This is consistent with earlier advice in this discussion to r= eference the work from which this forked. - Stewart Sent from my iPad > On 13 Apr 2018, at 03:35, =E5=BE=90=E5=B0=8F=E8=99=8E(=E4=B9=89=E5=85=88) <= xiaohu.xxh@alibaba-inc.com> wrote: >=20 > Hi Stewart, >=20 > If draft-farrel* was just describing an MPLS-based SFC technology that is d= ifferent from the MPLS-SR-based SFC technology that has been described in dr= aft-xuclad*, that would be fine. However, draft-farrel* also described the t= echnology that has been described in draft-xuclad* (see section 6) by "using= a different name for the same thing". Note that the title of section 6 in t= hose pervious versions of draft-farrel* is=20 > "MPLS Segment Routing". One co-author of draft-farrel* said they worked ve= ry hard to change the "Segment Routing" term to "label stack" term in the ne= w version of draft-farrel* in order to deal with the overlapping issue. Howe= ver, such change is just "using a different name for the same thing", and it= doesn't solve the overlapping issue at all, as had been pointed out by many= people. As said by one co-author of draft-farrel*, in a thread which is irr= elavant to this overlapping issue, "using a different name for the same thin= g is not so clever:)". In fact, it would cause unneccessary confusions to im= plementors by describing the same technology within different drafts. More b= adly, it would set a bad precedant in the IETF of copying the idea of the ex= isting draft by "using a different name for the same thing". >=20 > Best regards, > Xiaohu > ------------------------------------------------------------------ > Stewart Bryant > 2018=E5=B9=B44=E6=9C=8812=E6=97=A5(=E6=98=9F=E6=9C=9F=E5=9B=9B) 23:04 > "Bernier, Daniel" ; Robert Raszuk > mpls@ietf.org ; sfc@ietf.org > Re: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc >=20 >=20 > Rather than have a process discussion, I think we should go up a level=20 > and better understand the technical differences between the two drafts. >=20 > draft-farrel-mpls-sfc describes the actions at a hop in terms of a tuple=20= > that mirrors the SFC approach that allows a short indication of=20 > potentially re-entrant chains. In its simplest form it uses a compact=20 > MPLS stack to describe an arbitarily complex path that is compatile with=20= > simple edge routers which are often challenged in terms of the number of=20= > labels that they can push. >=20 > draft-xu-clad-spring-sr-service-chaining unrolls the path and explicitly=20= > calls out each hop and each function into the label stack. This results=20= > in a much larger MPLS label stack that will challenge some edge routers.=20= > The way that we generally deal with imposition limits is through the use=20= > of binding-SIDs, which in the limiting case resolves to the approach in=20= > draft-farrel with the limitation that the position on the path is=20 > implicit in the label stack size rather than explicitly specified by the S= I. >=20 > Mid-flight path changes (if such things are needed) is clearly simpler=20 > with draft-farrel. >=20 > The short stack in draft-farrel comes at the cost of greater network=20 > forwarding stack, and the long stack is the price that draft-xu-clad=20 > pays for the reduction in forwarding state. >=20 > The optimal design point between forwarding and control plane state is=20 > something that is dependent on many parameters, and is dependent on many=20= > network and operational factors, so much so, that don't think it is wise=20= > to rule either out of scope at this stage. >=20 > The hybrid mode in section 6 of draft-farrel supports the mixed mode in=20= > section 7 of the draft. This allows the construction of SFCs that are=20 > the concatination of two or more compacted sub-chains. This allows the=20 > operator to deploy a solution with the advantages of draft-farrel=20 > together with some of the flexibility of draft-xu-clad. >=20 > At this stage the two drafts are sufficienly different that I think we=20 > need to proceed with both at least to the point where we fully=20 > understand the detailed consequences of the two approachs and the=20 > scenarios where each finds it's niche. >=20 > After developing a better understanding the detail of each design, their=20= > control plane, and operational contexts and how each maps to customer=20 > network requirements, we can move the drafts to the appropriate IETF=20 > track. Such tracks may be anything from abandonment to IETF standard for=20= > one or both of these approaches. >=20 > Meanwhile I think that we need to focus our efforts on a deeper=20 > understanding of the technology and how each might make the Internet=20 > work better, rather than spending effort on arguing about IETF process. >=20 > - Stewart >=20 > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls >=20 > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls --Apple-Mail-269A483E-D001-4EF2-BC0F-DC78DE9FC742 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Xiaohu

What an earlie= r version of the draft said is of no importance. What it says going forward i= s what counts.

Perhaps the way to address your conc= ern is to include some text of the form that I used in my email of yesterday= to describe to the reader the difference in approach. This is consistent wi= th earlier advice in this discussion to reference the work from which this f= orked.

- Stewart



<= div id=3D"AppleMailSignature">Sent from my iPad

On 13 Apr 2018= , at 03:35, =E5=BE=90=E5=B0=8F=E8=99=8E(=E4=B9=89=E5=85=88) <xiaohu.xxh@alibaba-inc.com> wrote:<= br>
Hi Stewart,

If draft= -farrel* was just describing an MPLS-based SFC technology that is different f= rom the MPLS-SR-based SFC technology that has been described in draft-xuclad= *, that would be fine. However, draft-farrel* also described the technology t= hat has been described in draft-xuclad* (see section 6) by "using a different name for the=  same thing". Note that the title of section 6 in those per= vious versions of draft-farrel* is 
"MPLS Segm=
ent Routing". One co-author of draft-farrel* said they worked very hard=
 to change the "Segment Routing" term to "label stack" term in the new versi=
on of draft-farrel* in order to deal with the overlapping issue. However, su=
ch change is just "using a different name for=
 the same thing", and it doesn't solve the overlapping issue at all, as had been po=
inted out by many people. As said by one co-author of draft-farrel*, i=
n a thread which is irrelavant to this overlapping issue, "using a differe=
nt name for the same thing is not so clever:)"=
. In fact, it would cause unneccessary confusions to implementors by describ=
ing the same technology within different drafts. More badly, it would set a b=
ad precedant in the IETF of copying the idea of the existing draft by "using a different name for the same =
thing".<=
/pre>

Best regards,
=
Xiaohu
---------------= ---------------------------------------------------
Stewart Bryant <stewa= rt.bryant@gmail.com>
2018=E5=B9=B44=E6= =9C=8812=E6=97=A5(=E6=98=9F=E6=9C=9F=E5=9B=9B) 23:04
"Bernier, Daniel" <dan= iel.bernier@bell.ca>; Robert Raszuk <robert@raszuk.net>
mpls@ietf.org <mpls@ietf.org>; sfc@ietf.org &l= t;sfc@ietf.org>
Re: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc=


Rather than have&nb= sp;a process discussion, I think we should&nbs= p;go up a level 
and better understand = ;the technical differences between the two dra= fts.

draft-farrel-mpls-sfc describes the actions = at a hop in terms of a tuple 
tha= t mirrors the SFC approach that allows a&= nbsp;short indication of 
potentially re-entrant = ;chains. In its simplest form it uses a&n= bsp;compact 
MPLS stack to describe an arbi= tarily complex path that is compatile with&nbs= p;
simple edge routers which are often chal= lenged in terms of the number of 
labe= ls that they can push.

draft-xu-clad-spring-sr-se= rvice-chaining unrolls the path and explicitly = ;
calls out each hop and each function = ;into the label stack. This results 
in&nbs= p;a much larger MPLS label stack that wil= l challenge some edge routers. 
The way&nbs= p;that we generally deal with imposition limit= s is through the use 
of binding-SIDs, = ;which in the limiting case resolves to t= he approach in 
draft-farrel with the limit= ation that the position on the path is&nb= sp;
implicit in the label stack size rather=  than explicitly specified by the SI.

M= id-flight path changes (if such things are&nbs= p;needed) is clearly simpler 
with draft-farrel.=

The short stack in draft-farrel comes = at the cost of greater network 
forwarding&= nbsp;stack, and the long stack is the pri= ce that draft-xu-clad 
pays for the reducti= on in forwarding state.

The optimal design&n= bsp;point between forwarding and control plane = ;state is 
something that is dependent on&n= bsp;many parameters, and is dependent on many&= nbsp;
network and operational factors, so much&n= bsp;so, that don't think it is wise 
t= o rule either out of scope at this s= tage.

The hybrid mode in section 6 of&n= bsp;draft-farrel supports the mixed mode in section 7 of the draft. This allows the=  construction of SFCs that are 
the co= ncatination of two or more compacted sub-chain= s. This allows the 
operator to deploy = ;a solution with the advantages of draft-farre= l 
together with some of the flexibility&nb= sp;of draft-xu-clad.

At this stage the two&n= bsp;drafts are sufficienly different that I th= ink we 
need to proceed with both at&n= bsp;least to the point where we fully understand the detailed consequences of the t= wo approachs and the 
scenarios where each&= nbsp;finds it's niche.

After developing a be= tter understanding the detail of each design,&= nbsp;their 
control plane, and operational conte= xts and how each maps to customer 
net= work requirements, we can move the drafts = ;to the appropriate IETF 
track. Such track= s may be anything from abandonment to IET= F standard for 
one or both of these&n= bsp;approaches.

Meanwhile I think that we ne= ed to focus our efforts on a deeper =
understanding of the technology and how ea= ch might make the Internet 
work better,&nb= sp; rather than spending effort on arguing&nbs= p;about IETF process.

- Stewart

_______________= ________________________________
mpls mailing list
mpls@ietf.org
https://www.ietf.org/mailman/listinfo/mpls

______________________= _________________________
mpls mailing list
= mpls@ietf.org
https://www.ietf.org/mailman/li= stinfo/mpls
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14:23:11 +0800 Date: Fri, 13 Apr 2018 14:23:11 +0800 From: "=?UTF-8?B?5b6Q5bCP6JmOKOS5ieWFiCk=?=" To: "Stewart Bryant" Cc: "mpls" , "=?UTF-8?B?QmVybmllciwgRGFuaWVs?=" , "Robert Raszuk" , "mpls@ietf.org" , "sfc@ietf.org" Reply-To: "=?UTF-8?B?5b6Q5bCP6JmOKOS5ieWFiCk=?=" Message-ID: <5dab5411-0b08-4bd4-86ec-752e1803c3ff.xiaohu.xxh@alibaba-inc.com> X-Mailer: [Alimail-Mailagent revision 948139][W4_5223772][v5ForWebDing][Chrome] MIME-Version: 1.0 References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <1522554645079.8864@bell.ca> <1522812352107.5966@bell.ca> <489a9667-f159-4607-5834-b4bacf64989c@gmail.com> <09337fcf-64c9-450c-8dbc-ba8330611fe4.xiaohu.xxh@alibaba-inc.com>, <6EE25554-3714-4A75-896F-24CC89BAA807@gmail.com> In-Reply-To: <6EE25554-3714-4A75-896F-24CC89BAA807@gmail.com> x-aliyun-mail-creator: 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([173.37.102.18]) with mapi id 15.00.1320.000; Fri, 13 Apr 2018 01:28:57 -0500 From: "Frank Brockners (fbrockne)" To: Tom Herbert , Greg Mirsky CC: NVO3 , "int-area@ietf.org" , "Service Function Chaining IETF list" , IETF IPPM WG Thread-Topic: [Int-area] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AdPRe/DslDwu34XkSmq8g6ttV3Kt0QBLOKqAAAo10AAAACGHgAAAGEoAAAdNUeA= Date: Fri, 13 Apr 2018 06:28:57 +0000 Message-ID: References: In-Reply-To: Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.55.117.7] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [Int-area] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network 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<5dab5411-0b08-4bd4-86ec-752e1803c3ff.xiaohu.xxh@alibaba-inc.com> From: Stewart Bryant Message-ID: <6bea41f6-5519-f512-92e5-a72bbd6187da@gmail.com> Date: Fri, 13 Apr 2018 09:10:13 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <5dab5411-0b08-4bd4-86ec-752e1803c3ff.xiaohu.xxh@alibaba-inc.com> Content-Type: multipart/alternative; boundary="------------6794B0DB1CB9F181CCA06E93" Content-Language: en-GB Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Apr 2018 07:10:21 -0000 This is a multi-part message in MIME format. --------------6794B0DB1CB9F181CCA06E93 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit On 13/04/2018 08:23, 徐小虎(义先) wrote: > Hi Stewart, > > Thanks for your response. For the SR-based SFC mechanism that has been > described in draft-xuclad*, it's not helpful to describe it again in > another draft. The most simple and efficient way to address the > overlapping issue is to reference draft-xuclad* rather > than"using a different name for the same thing". I'm looking forward > to seeing the revision of draft-farrel* that would address the > overlapping issue concretely. Please read what I said. There are subtle but important technical differences between the two approaches. - Stewart > > If co-authors of draft-farrel* believed the current text as described > in draft-xuclad* is not good enough or misses something important, any > comments and suggestions are more than welcome. I will send you some text to include in draft-xuclad that points to the important differences in the approach taken in draft-farrel. This will clarify the issue to the reader. I hope that this is an acceptable resolution of this issue. - Stewart > > Best regards, > Xiaohu > > ------------------------------------------------------------------ > Stewart Bryant > 2018年4月13日(星期五) 13:27 > 徐小虎(义先) > mpls ; "Bernier, Daniel" > ; Robert Raszuk ; > mpls@ietf.org ; sfc@ietf.org > Re: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc > > Hi Xiaohu > > What an earlier version of the draft said is of no importance. > What it says going forward is what counts. > > Perhaps the way to address your concern is to include some text of > the form that I used in my email of yesterday to describe to the > reader the difference in approach. This is consistent with earlier > advice in this discussion to reference the work from which this > forked. > > - Stewart > > > > Sent from my iPad > > On 13 Apr 2018, at 03:35, 徐小虎(义先) > wrote: > > Hi Stewart, > > If draft-farrel* was just describing an MPLS-based SFC technology > that is different from the MPLS-SR-based SFC technology that has > been described in draft-xuclad*, that would be fine. However, > draft-farrel* also described the technology that has been > described in draft-xuclad* (see section 6) by > "using a different name for the same thing". Note that the title > of section 6 in those pervious versions of draft-farrel* is > > "MPLS Segment Routing". One co-author of draft-farrel* said they worked very hard to change the "Segment Routing" term to "label stack" term in the new version of draft-farrel* in order to deal with the overlapping issue. However, such change is just"using a different name for the same thing", and it doesn't solve > the overlapping issue at all, as had been pointed out by many people. As said by one co-author of draft-farrel*, in a thread which is irrelavant to this overlapping issue,"using a different name for the same thing is not so clever:)". In > fact, it would cause unneccessary confusions to implementors by > describing the same technology within different drafts. More > badly, it would set a bad precedant in the IETF of copying the > idea of the existing draft by > "using a different name for the same thing". > > > Best regards, > Xiaohu > ------------------------------------------------------------------ > Stewart Bryant > > 2018年4月12日(星期四) 23:04 > "Bernier, Daniel" >; Robert Raszuk > > mpls@ietf.org >; sfc@ietf.org > > > Re: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc > > > Rather than have a process discussion, I think we should go up a level > > and better understand the technical differences between the two drafts. > > draft-farrel-mpls-sfc describes the actions at a hop in terms of a tuple > > that mirrors the SFC approach that allows a short indication of > potentially re-entrant chains. In its simplest form it uses a compact > MPLS stack to describe an arbitarily complex path that is compatile with > > simple edge routers which are often challenged in terms of the number of > > labels that they can push. > > draft-xu-clad-spring-sr-service-chaining unrolls the path and explicitly > > calls out each hop and each function into the label stack. This results > > in a much larger MPLS label stack that will challenge some edge routers. > > The way that we generally deal with imposition limits is through the use > > of binding-SIDs, which in the limiting case resolves to the approach in > > draft-farrel with the limitation that the position on the path is > implicit in the label stack size rather than explicitly specified by the SI. > > Mid-flight path changes (if such things are needed) is clearly simpler > > with draft-farrel. > > The short stack in draft-farrel comes at the cost of greater network > forwarding stack, and the long stack is the price that draft-xu-clad > pays for the reduction in forwarding state. > > The optimal design point between forwarding and control plane state is > > something that is dependent on many parameters, and is dependent on many > > network and operational factors, so much so, that don't think it is wise > > to rule either out of scope at this stage. > > The hybrid mode in section 6 of draft-farrel supports the mixed mode in > > section 7 of the draft. This allows the construction of SFCs that are > the concatination of two or more compacted sub-chains. This allows the > > operator to deploy a solution with the advantages of draft-farrel > together with some of the flexibility of draft-xu-clad. > > At this stage the two drafts are sufficienly different that I think we > > need to proceed with both at least to the point where we fully > understand the detailed consequences of the two approachs and the > scenarios where each finds it's niche. > > After developing a better understanding the detail of each design, their > > control plane, and operational contexts and how each maps to customer > network requirements, we can move the drafts to the appropriate IETF > track. Such tracks may be anything from abandonment to IETF standard for > > one or both of these approaches. > > Meanwhile I think that we need to focus our efforts on a deeper > understanding of the technology and how each might make the Internet > work better,  rather than spending effort on arguing about IETF process. > > - Stewart > > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls > > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls > > --------------6794B0DB1CB9F181CCA06E93 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: base64 PGh0bWw+DQogIDxoZWFkPg0KICAgIDxtZXRhIGh0dHAtZXF1aXY9IkNvbnRlbnQtVHlwZSIg Y29udGVudD0idGV4dC9odG1sOyBjaGFyc2V0PXV0Zi04Ij4NCiAgPC9oZWFkPg0KICA8Ym9k eSB0ZXh0PSIjMDAwMDAwIiBiZ2NvbG9yPSIjRkZGRkZGIj4NCiAgICA8cD48YnI+DQogICAg 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"Frank Brockners (fbrockne)" To: =?utf-8?B?5b6Q5bCP6JmOKOS5ieWFiCk=?= , Int-area CC: NVO3 , int-area , "Service Function Chaining IETF list" , IETF IPPM WG Thread-Topic: [nvo3] [Int-area] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AdPRe/DslDwu34XkSmq8g6ttV3Kt0QBLOKqAAB8CvoAACCcTMA== Date: Fri, 13 Apr 2018 08:59:35 +0000 Message-ID: References: , In-Reply-To: Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.55.117.7] Content-Type: multipart/alternative; boundary="_000_b30de0d8c78b44609d835ff8821efe0dXCHRCD008ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [nvo3] [Int-area] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Apr 2018 08:59:41 -0000 --_000_b30de0d8c78b44609d835ff8821efe0dXCHRCD008ciscocom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgWGlhb2h1LA0KDQpwbGVhc2Ugc2VlIGlubGluZSAo4oCcLi4uRkLigJwpDQoNCkZyb206IG52 bzMgPG52bzMtYm91bmNlc0BpZXRmLm9yZz4gT24gQmVoYWxmIE9mID8/Pyg/PykNClNlbnQ6IEZy ZWl0YWcsIDEzLiBBcHJpbCAyMDE4IDA5OjQyDQpUbzogSW50LWFyZWEgPGludC1hcmVhLWJvdW5j ZXNAaWV0Zi5vcmc+OyBGcmFuayBCcm9ja25lcnMgKGZicm9ja25lKSA8ZmJyb2NrbmVAY2lzY28u Y29tPg0KQ2M6IE5WTzMgPG52bzNAaWV0Zi5vcmc+OyBpbnQtYXJlYSA8aW50LWFyZWFAaWV0Zi5v cmc+OyBTZXJ2aWNlIEZ1bmN0aW9uIENoYWluaW5nIElFVEYgbGlzdCA8c2ZjQGlldGYub3JnPjsg SUVURiBJUFBNIFdHIDxpcHBtQGlldGYub3JnPg0KU3ViamVjdDogUmU6IFtudm8zXSBbSW50LWFy ZWFdIFtpcHBtXSBlbmNhcHN1bGF0aW9uIG9mIElPQU0gZGF0YSBpbiB2YXJpb3VzIHByb3RvY29s cyAtIGZvbGxvdyB1cCBmcm9tIFdHIGRpc2N1c3Npb24gaW4gTG9uZG9uDQoNCkhpLA0KDQpJdCBz 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(mail-wr0-x232.google.com [IPv6:2a00:1450:400c:c0c::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 45A66124E15 for ; Fri, 13 Apr 2018 11:22:18 -0700 (PDT) Received: by mail-wr0-x232.google.com with SMTP id v60so6449599wrc.7 for ; Fri, 13 Apr 2018 11:22:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=barefootnetworks.com; s=google; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=Pl4WONeqhdnr0wnxi+C1+GEPOqNofzvGDqGkv0g6M5s=; b=H5hM10SFYDe2wSuA+ONzXAnQWpiUgYOUHJL70KlcgE7nNu+eFksWfGZH2ilFgsWr8s StJjaipdZIoZQwnrXfFidkluoWT/CEGctF3bzFryeBSZfBFS8kXwUPGMXNKso42lTtgp YMMezbJTL7efw+0nNkc7WHSGjDTvhxiKn2F28= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=Pl4WONeqhdnr0wnxi+C1+GEPOqNofzvGDqGkv0g6M5s=; 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IPPM WG Content-Type: multipart/alternative; boundary="94eb2c05f484b160be0569bef399" Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 13 Apr 2018 18:22:23 -0000 --94eb2c05f484b160be0569bef399 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Tom, On Thu, Apr 12, 2018 at 10:17 PM, Tom Herbert wrote: > Mickey, > > Looking at these ippm drafts more closely, I have a much more > fundamental concern. > > In draft-brockners-ippm-ioam-geneve-00 for instance, there is the text > in the introduction: > > "In-situ OAM (IOAM) records OAM information within the packet while > the packet traverses a particular network domain. The term "in-situ" > refers to the fact that the IOAM data fields are added to the data > packets rather than is being sent within packets specifically > dedicated to OAM. This document defines how IOAM data fields are > transported as part of the Geneve [I-D.ietf-nvo3-geneve] > encapsulation." > > I assume this means that as packets with Geneve encapsulation traverse > the network they are interpreted by intermediate nodes as being > Geneve. Since Geneve is a UDP encapsulation, then the destination UDP > port number would be used to identify packets as being Geneve. So an > intermediate device might be looking for UDP packets destined to port > 6081 (the assigned UDP port for Geneve). If my understanding is > correct, then this is a problem. > > UDP port numbers do not have global meaning. An intermediate device > may very well see UDP packets destined to port 6081 that are not > actually Geneve. This scenario is discussed in RFC7605: > > "...intermediate device interprets traffic based on the port number. > It is important to recognize that any interpretation of port numbers > -- except at the endpoints -- may be incorrect, because port numbers > are meaningful only at the endpoints." > > If the UDP data is modified, as the draft would imply, then > misinterpretation may also mean silent data corruption of packets. A > protocol that would allow this seems pretty incorrect! Note that this > would be true also for any UDP encapsulation that the network tries to > interpret. > The intention is to allow for multiple nodes that a packet traverses to be able to insert IOAM node information in the same trace option, but leave some flexibility regarding which nodes actually do the IOAM processing and the node information. This may vary depending on the transport. In case of a tunneled encapsulation such as Geneve or VXLAN, there may still be multiple hops. For example a network may use Geneve or VXLAN, but only do L2 processing at ToRs, with L3 processing done at aggregation or core switches. In this case many packets would do 2 Geneve or VXLAN hops, so the packet would contain IOAM node information from two nodes. Another example is service function chaining using Geneve or VXLAN rather than NSH. > I am also wondering if hop-by-hop options been considered for this > application? Their interpretation in the network is unabiguous and > they also have the advantage that the work with any IP protocol or > encapsulation. > IPv6 hop-by-hop options has been considered. See draft-brockners-inband-oam-transport-05. This has not yet been broken out into a separate draft. Mickey > Thanks, > Tom > > > On Thu, Apr 12, 2018 at 3:31 PM, Mickey Spiegel > wrote: > > Tom, > > > > On Thu, Apr 12, 2018 at 2:46 PM, Tom Herbert > wrote: > >> > >> On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky > >> wrote: > >> > Hi Frank, > >> > thank you for sharing your points. Please find my notes in-line and > >> > tagged > >> > GIM>>. I believe that this is very much relevant to work of other > >> > working > >> > groups that directly work on the overlay encapsulations in the cente= r > of > >> > the > >> > discussion and hence I've added them to the list. Hope we'll have mo= re > >> > opinions to reach the conclusion that is acceptable to all. > >> > > >> > Regards, > >> > Greg > >> > > >> > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) > >> > wrote: > >> >> > >> >> Back at the IPPM meeting in London, we discussed several drafts > dealing > >> >> with the encapsulation of IOAM data in various protocols > >> >> (draft-brockners-ippm-ioam-vxlan-gpe-00, > >> >> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). > One > >> >> discussion topic that we decided to take to the list was the questi= on > >> >> on > >> >> whether draft-ooamdt-rtgwg-ooam-header could be leveraged. After > >> >> carefully > >> >> considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusio= n > >> >> that > >> >> the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM: > >> >> > >> >> * Efficiency: IOAM adds data to live user traffic. As such, an > >> >> encapsulation needs to be as efficient as possible. The =E2=80=9COO= AM header=E2=80=9D > >> >> is 8 > >> >> bytes long. The approach for IOAM data encapsulation in the above > >> >> mentioned > >> >> drafts only requires 4 bytes. Using the OOAM header approach would > add > >> >> an > >> >> unnecessary overhead of 4 bytes =E2=80=93 which is significant. > >> Greg, > >> > >> I'm missing something here. I looked at the drafts you referenced and > >> each of them looks like the overhead for OAM is greater that four > >> bytes. In each there is some overhead equivalent to type/length, for > >> instance in Geneve four bytes are needed for option class, type, and > >> length. Unless the the OAM data is zero length, I don't see how this > >> adds up to only four bytes of overhead. > > > > > > The four versus eight bytes just refers to the fields in the four bytes > of > > IOAM > > info, that is common to all IOAM options. Beyond that, there are IOAM > option > > specific fields. For example if doing one of the IOAM trace options, > there > > are > > four bytes of trace option header, including the IOAM-trace-type, > NodeLen, > > Flags, and RemainingLen fields. These are followed by the node data lis= t > > containing the per hop IOAM information. > > > > In looking at the OOAM header content, it has nothing to do with any of > the > > IOAM information after the first four bytes. It contains another varian= t > of > > the > > information in the first four bytes of IOAM info, spread out over eight > > bytes. > > > >> > >> Tom > >> > >> > > >> > GIM>> The difference in four octets is because OOAM Header: > >> > > >> > provides more flexibility, e.g. Flags field and Reserved fields; > > > > > > The flags field only has one defined flag at the moment, for a timestam= p > > block. For IOAM trace we need per hop timestamps, which the timestamp > > block cannot address, i.e. the timestamp block is redundant for IOAM. > > > >> > >> > supports larger OAM packets than iOAM header; > > > > > > For IOAM purposes, 1020 octets is more than enough. > > > >> > >> > is future proof by supporting versioning (Version field). > > > > > > IMO, taking the first two bits of the IOAM-Type to define a Version fie= ld > > would be a good thing. This does not require adding four more bytes of > > overhead. 64 IOAM-Types is more than enough. > > > >> > >> >> > >> >> * Maturity: IOAM has several implementations, which were also shown > at > >> >> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting additi= onal > implementations > >> >> to > >> >> be publicized soon. Interoperable implementations need timely > >> >> specifications. Despite the question being asked, the recent thread > on > >> >> OOAM > >> >> in the NVO3 list hasn=E2=80=99t revealed any implementation of the = OOAM > header. > >> >> In > >> >> addition, the thread revealed that several fundamental questions > about > >> >> the > >> >> OOAM header are still open, such as whether or how active OAM > >> >> mechanisms > >> >> within protocols such as Geneve would apply to the OOAM header. Thi= s > >> >> ultimately means that we won=E2=80=99t get to a timely specificatio= n. > >> > > >> > GIM>> May I ask which encapsulations supported by the implementation= s > >> > you > >> > refer to. Until very recently all iOAM proposals were to use meta-da= ta > >> > TLV > >> > in, e.g. Geneve and NSH. And if these or some of these implementatio= ns > >> > already updated to the newly proposed iOAM shim, I don't see problem > in > >> > making them use OOAM Header. Would you agree? > >> > > >> >> > >> >> * Scope: It isn=E2=80=99t entirely clear to which protocols the OOA= M header > >> >> would > >> >> ultimately apply to. The way the OOAM header is defined, OOAM uses = a > >> >> 8-bit > >> >> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some prot= ocols that IOAM > data > >> >> needs to be encapsulated into use 16-bits for their next protocol > code > >> >> points. See e.g. the GRE encapsulation =E2=80=93 as specified in > >> >> draft-weis-ippm-ioam-gre-00. > >> > > >> > GIM>> The first paragraph of the Introduction section states: > >> > New protocols that support overlay networks like VxLAN-GPE > >> > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve > >> > [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], > and > >> > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. > >> > Ethernet, IPv4/IPv6, and recognize Operations, Administration, an= d > >> > Maintenance (OAM) as one of distinct types. That ensures that > >> > Overlay OAM (OOAM)packets are sharing fate with Overlay data pack= et > >> > traversing the underlay. > >> > I'm updating the OOAM Header draft and along with cleaning nits will > >> > update > >> > reference to GUE. I think that the list and the statemnt are quite > clear > >> > in > >> > identifying the scope of networks that may benefit from using not on= ly > >> > common OOAM Header but common OOAM mechanisms, e.g. Echo > Request/Reply. > >> > > >> >> With the above in mind, I=E2=80=99d suggest that the WG moves forwa= rd with > >> >> specific definitions for encapsulating IOAM data into protocols =E2= =80=93 per > >> >> the > >> >> above mentioned drafts. > >> >> > >> >> > >> >> > >> >> Regards, Frank > >> >> > >> >> > >> >> _______________________________________________ > >> >> ippm mailing list > >> >> ippm@ietf.org > >> >> https://www.ietf.org/mailman/listinfo/ippm > >> >> > >> > > >> > > >> > _______________________________________________ > >> > Int-area mailing list > >> > Int-area@ietf.org > >> > https://www.ietf.org/mailman/listinfo/int-area > >> > > >> > >> _______________________________________________ > >> ippm mailing list > >> ippm@ietf.org > >> https://www.ietf.org/mailman/listinfo/ippm > > > > > --94eb2c05f484b160be0569bef399 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Tom,

On Thu, Apr 12, 2018 at 10:17 PM, Tom Herbert <= ;tom@herbertland.c= om> wrote:
Mickey,

Looking at these ippm drafts more closely, I have a much more
fundamental concern.

In draft-brockners-ippm-ioam-geneve-00 for instance, there is the text=
in the introduction:

"In-situ OAM (IOAM) records OAM information within the packet while the packet traverses a particular network domain.=C2=A0 The term "in-s= itu"
refers to the fact that the IOAM data fields are added to the data
packets rather than is being sent within packets specifically
dedicated to OAM.=C2=A0 This document defines how IOAM data fields are
transported as part of the Geneve [I-D.ietf-nvo3-geneve]
encapsulation."

I assume this means that as packets with Geneve encapsulation traverse
the network they are interpreted by intermediate nodes as being
Geneve. Since Geneve is a UDP encapsulation, then the destination UDP
port number would be used to identify packets as being Geneve. So an
intermediate device might be looking for UDP packets destined to port
6081 (the assigned UDP port for Geneve). If my understanding is
correct, then this is a problem.

UDP port numbers do not have global meaning. An intermediate device
may very well see UDP packets destined to port 6081 that are not
actually Geneve. This scenario is discussed in RFC7605:

"...intermediate device interprets traffic based on the port number. It is important to recognize that any interpretation of port numbers
-- except at the endpoints -- may be incorrect, because port numbers
are meaningful only at the endpoints."

If the UDP data is modified, as the draft would imply, then
misinterpretation may also mean silent data corruption of packets. A
protocol that would allow this seems pretty incorrect! Note that this
would be true also for any UDP encapsulation that the network tries to
interpret.

The intention is to allow fo= r multiple nodes that a packet traverses
to be able to insert IOA= M node information in the same trace option,
but leave some flexi= bility regarding which nodes actually do the
IOAM processing and = the node information. This may vary
depending on the transport.

In case of a tunneled encapsulation such as Geneve = or VXLAN,
there may still be multiple hops. For example a network= may use
Geneve or VXLAN, but only do L2 processing at ToRs, with= L3
processing done at aggregation or core switches. In this case=
many packets would do 2 Geneve or VXLAN hops, so the packet
would contain IOAM node information from two nodes.

Another example is service function chaining using Geneve or
<= div>VXLAN rather than NSH.


I am also wondering if hop-by-hop options been considered for this
application? Their interpretation in the network is unabiguous and
they also have the advantage that the work with any IP protocol or
encapsulation.

IPv6 hop-by-hop options = has been considered. See
draft-brockners-inband-oam-transport-05.= This has not yet been
broken out into a separate draft.

Mickey


Thanks,
Tom


On Thu, Apr 12, 2018 at 3:31 PM, Mickey Spiegel
<mspiegel@barefootnetwo= rks.com> wrote:
> Tom,
>
> On Thu, Apr 12, 2018 at 2:46 PM, Tom Herbert <tom@herbertland.com> wrote:
>>
>> On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky <gregimirsky@gmail.com>
>> wrote:
>> > Hi Frank,
>> > thank you for sharing your points. Please find my notes in-li= ne and
>> > tagged
>> > GIM>>. I believe that this is very much relevant to wor= k of other
>> > working
>> > groups that directly work on the overlay encapsulations in th= e center of
>> > the
>> > discussion and hence I've added them to the list. Hope we= 'll have more
>> > opinions to reach the conclusion that is acceptable to all. >> >
>> > Regards,
>> > Greg
>> >
>> > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne)<= br> >> > <fbrockne@cisco.com<= /a>> wrote:
>> >>
>> >> Back at the IPPM meeting in London, we discussed several = drafts dealing
>> >> with the encapsulation of IOAM data in various protocols<= br> >> >> (draft-brockners-ippm-ioam-vxlan-gpe-00,
>> >> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm= -ioam-gre-00). One
>> >> discussion topic that we decided to take to the list was = the question
>> >> on
>> >> whether draft-ooamdt-rtgwg-ooam-header could be leveraged= .=C2=A0 After
>> >> carefully
>> >> considering draft-ooamdt-rtgwg-ooam-header, I came t= o the conclusion
>> >> that
>> >> the =E2=80=9COOAM header=E2=80=9D does not meet the needs= of IOAM:
>> >>
>> >> * Efficiency: IOAM adds data to live user traffic. As suc= h, an
>> >> encapsulation needs to be as efficient as possible. The = =E2=80=9COOAM header=E2=80=9D
>> >> is 8
>> >> bytes long. The approach for IOAM data encapsulation in t= he above
>> >> mentioned
>> >> drafts only requires 4 bytes. Using the OOAM header appro= ach would add
>> >> an
>> >> unnecessary overhead of 4 bytes =E2=80=93 which is signif= icant.
>> Greg,
>>
>> I'm missing something here. I looked at the drafts you referen= ced and
>> each of them looks like the overhead for OAM is greater that four<= br> >> bytes. In each there is some overhead equivalent to type/length, f= or
>> instance in Geneve four bytes are needed for option class, type, a= nd
>> length. Unless the the OAM data is zero length, I don't see ho= w this
>> adds up to only four bytes of overhead.
>
>
> The four versus eight bytes just refers to the fields in the four byte= s of
> IOAM
> info, that is common to all IOAM options. Beyond that, there are IOAM = option
> specific fields. For example if doing one of the IOAM trace options, t= here
> are
> four bytes of trace option header, including the IOAM-trace-type, Node= Len,
> Flags, and RemainingLen fields. These are followed by the node data li= st
> containing the per hop IOAM information.
>
> In looking at the OOAM header content, it has nothing to do with any o= f the
> IOAM information after the first four bytes. It contains another varia= nt of
> the
> information in the first four bytes of IOAM info, spread out over eigh= t
> bytes.
>
>>
>> Tom
>>
>> >
>> > GIM>> The difference in four octets is because OOAM Hea= der:
>> >
>> > provides more flexibility, e.g. Flags field and Reserved fiel= ds;
>
>
> The flags field only has one defined flag at the moment, for a timesta= mp
> block. For IOAM trace we need per hop timestamps, which the timestamp<= br> > block cannot address, i.e. the timestamp block is redundant for IOAM.<= br> >
>>
>> > supports larger OAM packets than iOAM header;
>
>
> For IOAM purposes, 1020 octets is more than enough.
>
>>
>> > is future proof by supporting versioning (Version field).
>
>
> IMO, taking the first two bits of the IOAM-Type to define a Version fi= eld
> would be a good thing. This does not require adding four more bytes of=
> overhead. 64 IOAM-Types is more than enough.
>
>>
>> >>
>> >> * Maturity: IOAM has several implementations, which were = also shown at
>> >> recent IETF hackathons =E2=80=93 and we=E2=80=99re expect= ing additional implementations
>> >> to
>> >> be publicized soon. Interoperable implementations need ti= mely
>> >> specifications. Despite the question being asked, the rec= ent thread on
>> >> OOAM
>> >> in the NVO3 list hasn=E2=80=99t revealed any implementati= on of the OOAM header.
>> >> In
>> >> addition, the thread revealed that several fundamental qu= estions about
>> >> the
>> >> OOAM header are still open, such as whether or how active= OAM
>> >> mechanisms
>> >> within protocols such as Geneve would apply to the OOAM h= eader. This
>> >> ultimately means that we won=E2=80=99t get to a timely sp= ecification.
>> >
>> > GIM>> May I ask which encapsulations supported by the i= mplementations
>> > you
>> > refer to. Until very recently all iOAM proposals were to use = meta-data
>> > TLV
>> > in, e.g. Geneve and NSH. And if these or some of these implem= entations
>> > already updated to the newly proposed iOAM shim, I don't = see problem in
>> > making them use OOAM Header. Would you agree?
>> >
>> >>
>> >> * Scope: It isn=E2=80=99t entirely clear to which protoco= ls the OOAM header
>> >> would
>> >> ultimately apply to. The way the OOAM header is defined, = OOAM uses a
>> >> 8-bit
>> >> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol.= Some protocols that IOAM data
>> >> needs to be encapsulated into use 16-bits for their next = protocol code
>> >> points. See e.g. the GRE encapsulation =E2=80=93 as speci= fied in
>> >> draft-weis-ippm-ioam-gre-00.
>> >
>> > GIM>> The first paragraph of the Introduction section s= tates:
>> >=C2=A0 =C2=A0 New protocols that support overlay networks like= VxLAN-GPE
>> >=C2=A0 =C2=A0 [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gu= e], Geneve
>> >=C2=A0 =C2=A0 [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls= -encapsulation], and
>> >=C2=A0 =C2=A0 NSH [I-D.ietf-sfc-nsh] support multi-protocol pa= yload, e.g.
>> >=C2=A0 =C2=A0 Ethernet, IPv4/IPv6, and recognize Operations, A= dministration, and
>> >=C2=A0 =C2=A0 Maintenance (OAM) as one of distinct types.=C2= =A0 That ensures that
>> >=C2=A0 =C2=A0 Overlay OAM (OOAM)packets are sharing fate with = Overlay data packet
>> >=C2=A0 =C2=A0 traversing the underlay.
>> > I'm updating the OOAM Header draft and along with cleanin= g nits will
>> > update
>> > reference to GUE. I think that the list and the statemnt are = quite clear
>> > in
>> > identifying the scope of networks that may benefit from using= not only
>> > common OOAM Header but common OOAM mechanisms, e.g. Echo Requ= est/Reply.
>> >
>> >> With the above in mind, I=E2=80=99d suggest that the WG m= oves forward with
>> >> specific definitions for encapsulating IOAM data into pro= tocols =E2=80=93 per
>> >> the
>> >> above mentioned drafts.
>> >>
>> >>
>> >>
>> >> Regards, Frank
>> >>
>> >>
>> >> _______________________________________________
>> >> ippm mailing list
>> >> ippm@ietf.org
>> >> https://www.ietf.org/mailman/listin= fo/ippm
>> >>
>> >
>> >
>> > _______________________________________________
>> > Int-area mailing list
>> > Int-area@ietf.org >> > https://www.ietf.org/mailman/listin= fo/int-area
>> >
>>
>> _______________________________________________
>> ippm mailing list
>> ippm@ietf.org
>> https://www.ietf.org/mailman/listinfo/ippm
>
>

--94eb2c05f484b160be0569bef399-- From nobody Fri Apr 13 13:33:03 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5C0BF127978; Fri, 13 Apr 2018 13:32:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.2 X-Spam-Level: X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, 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 mcNEU_tOqwfb; Fri, 13 Apr 2018 13:32:43 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [194.213.3.17]) (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 58989129515; Fri, 13 Apr 2018 13:32:43 -0700 (PDT) Received: from lhreml701-cah.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id 22BC3D7A73901; Fri, 13 Apr 2018 21:32:39 +0100 (IST) Received: from SJCEML703-CHM.china.huawei.com (10.208.112.39) by lhreml701-cah.china.huawei.com (10.201.108.42) with Microsoft SMTP Server (TLS) id 14.3.382.0; Fri, 13 Apr 2018 21:32:40 +0100 Received: from SJCEML521-MBB.china.huawei.com ([169.254.6.91]) by SJCEML703-CHM.china.huawei.com ([169.254.5.179]) with mapi id 14.03.0382.000; Fri, 13 Apr 2018 13:32:34 -0700 From: Uma Chunduri To: Mickey Spiegel , Tom Herbert CC: Greg Mirsky , NVO3 , "int-area@ietf.org" , Service Function Chaining IETF list , IETF IPPM WG Thread-Topic: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AQHT01Rv/8zdN25zjECovFVjh39kLaP/JHDg Date: Fri, 13 Apr 2018 20:32:33 +0000 Message-ID: <25B4902B1192E84696414485F572685413553740@SJCEML521-MBB.china.huawei.com> References: 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13 Apr 2018 17:55:35 -0700 (PDT) MIME-Version: 1.0 Received: by 10.237.48.35 with HTTP; Fri, 13 Apr 2018 17:55:34 -0700 (PDT) In-Reply-To: References: From: Tom Herbert Date: Fri, 13 Apr 2018 17:55:34 -0700 Message-ID: To: Mickey Spiegel Cc: Greg Mirsky , NVO3 , int-area@ietf.org, Service Function Chaining IETF list , IETF IPPM WG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 14 Apr 2018 00:55:44 -0000 On Fri, Apr 13, 2018 at 11:22 AM, Mickey Spiegel wrote: > Tom, > > On Thu, Apr 12, 2018 at 10:17 PM, Tom Herbert wrote= : >> >> Mickey, >> >> Looking at these ippm drafts more closely, I have a much more >> fundamental concern. >> >> In draft-brockners-ippm-ioam-geneve-00 for instance, there is the text >> in the introduction: >> >> "In-situ OAM (IOAM) records OAM information within the packet while >> the packet traverses a particular network domain. The term "in-situ" >> refers to the fact that the IOAM data fields are added to the data >> packets rather than is being sent within packets specifically >> dedicated to OAM. This document defines how IOAM data fields are >> transported as part of the Geneve [I-D.ietf-nvo3-geneve] >> encapsulation." >> >> I assume this means that as packets with Geneve encapsulation traverse >> the network they are interpreted by intermediate nodes as being >> Geneve. Since Geneve is a UDP encapsulation, then the destination UDP >> port number would be used to identify packets as being Geneve. So an >> intermediate device might be looking for UDP packets destined to port >> 6081 (the assigned UDP port for Geneve). If my understanding is >> correct, then this is a problem. >> >> UDP port numbers do not have global meaning. An intermediate device >> may very well see UDP packets destined to port 6081 that are not >> actually Geneve. This scenario is discussed in RFC7605: >> >> "...intermediate device interprets traffic based on the port number. >> It is important to recognize that any interpretation of port numbers >> -- except at the endpoints -- may be incorrect, because port numbers >> are meaningful only at the endpoints." >> >> If the UDP data is modified, as the draft would imply, then >> misinterpretation may also mean silent data corruption of packets. A >> protocol that would allow this seems pretty incorrect! Note that this >> would be true also for any UDP encapsulation that the network tries to >> interpret. > > > The intention is to allow for multiple nodes that a packet traverses > to be able to insert IOAM node information in the same trace option, > but leave some flexibility regarding which nodes actually do the > IOAM processing and the node information. This may vary > depending on the transport. > > In case of a tunneled encapsulation such as Geneve or VXLAN, > there may still be multiple hops. For example a network may use > Geneve or VXLAN, but only do L2 processing at ToRs, with L3 > processing done at aggregation or core switches. In this case > many packets would do 2 Geneve or VXLAN hops, so the packet > would contain IOAM node information from two nodes. > Mickey, Thanks, for the explanation. The requirements around this are not clear in the drafts so I would suggest that be clarified. Intermediate nodes should never look at, much less change, transport layer data for packets for which they are not the addressee (we've already seen several instances of implemenations skirting these rules out of convenience!) One other nit: I don't think a six page I-D really needs twelve authors! Please consider reducing the number to only the major contributors. Tom > Another example is service function chaining using Geneve or > VXLAN rather than NSH. > >> >> I am also wondering if hop-by-hop options been considered for this >> application? Their interpretation in the network is unabiguous and >> they also have the advantage that the work with any IP protocol or >> encapsulation. > > > IPv6 hop-by-hop options has been considered. See > draft-brockners-inband-oam-transport-05. This has not yet been > broken out into a separate draft. > > Mickey > >> >> Thanks, >> Tom >> >> >> On Thu, Apr 12, 2018 at 3:31 PM, Mickey Spiegel >> wrote: >> > Tom, >> > >> > On Thu, Apr 12, 2018 at 2:46 PM, Tom Herbert >> > wrote: >> >> >> >> On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky >> >> wrote: >> >> > Hi Frank, >> >> > thank you for sharing your points. Please find my notes in-line and >> >> > tagged >> >> > GIM>>. I believe that this is very much relevant to work of other >> >> > working >> >> > groups that directly work on the overlay encapsulations in the cent= er >> >> > of >> >> > the >> >> > discussion and hence I've added them to the list. Hope we'll have >> >> > more >> >> > opinions to reach the conclusion that is acceptable to all. >> >> > >> >> > Regards, >> >> > Greg >> >> > >> >> > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) >> >> > wrote: >> >> >> >> >> >> Back at the IPPM meeting in London, we discussed several drafts >> >> >> dealing >> >> >> with the encapsulation of IOAM data in various protocols >> >> >> (draft-brockners-ippm-ioam-vxlan-gpe-00, >> >> >> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). >> >> >> One >> >> >> discussion topic that we decided to take to the list was the >> >> >> question >> >> >> on >> >> >> whether draft-ooamdt-rtgwg-ooam-header could be leveraged. After >> >> >> carefully >> >> >> considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusi= on >> >> >> that >> >> >> the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM: >> >> >> >> >> >> * Efficiency: IOAM adds data to live user traffic. As such, an >> >> >> encapsulation needs to be as efficient as possible. The =E2=80=9CO= OAM >> >> >> header=E2=80=9D >> >> >> is 8 >> >> >> bytes long. The approach for IOAM data encapsulation in the above >> >> >> mentioned >> >> >> drafts only requires 4 bytes. Using the OOAM header approach would >> >> >> add >> >> >> an >> >> >> unnecessary overhead of 4 bytes =E2=80=93 which is significant. >> >> Greg, >> >> >> >> I'm missing something here. I looked at the drafts you referenced and >> >> each of them looks like the overhead for OAM is greater that four >> >> bytes. In each there is some overhead equivalent to type/length, for >> >> instance in Geneve four bytes are needed for option class, type, and >> >> length. Unless the the OAM data is zero length, I don't see how this >> >> adds up to only four bytes of overhead. >> > >> > >> > The four versus eight bytes just refers to the fields in the four byte= s >> > of >> > IOAM >> > info, that is common to all IOAM options. Beyond that, there are IOAM >> > option >> > specific fields. For example if doing one of the IOAM trace options, >> > there >> > are >> > four bytes of trace option header, including the IOAM-trace-type, >> > NodeLen, >> > Flags, and RemainingLen fields. These are followed by the node data li= st >> > containing the per hop IOAM information. >> > >> > In looking at the OOAM header content, it has nothing to do with any o= f >> > the >> > IOAM information after the first four bytes. It contains another varia= nt >> > of >> > the >> > information in the first four bytes of IOAM info, spread out over eigh= t >> > bytes. >> > >> >> >> >> Tom >> >> >> >> > >> >> > GIM>> The difference in four octets is because OOAM Header: >> >> > >> >> > provides more flexibility, e.g. Flags field and Reserved fields; >> > >> > >> > The flags field only has one defined flag at the moment, for a timesta= mp >> > block. For IOAM trace we need per hop timestamps, which the timestamp >> > block cannot address, i.e. the timestamp block is redundant for IOAM. >> > >> >> >> >> > supports larger OAM packets than iOAM header; >> > >> > >> > For IOAM purposes, 1020 octets is more than enough. >> > >> >> >> >> > is future proof by supporting versioning (Version field). >> > >> > >> > IMO, taking the first two bits of the IOAM-Type to define a Version >> > field >> > would be a good thing. This does not require adding four more bytes of >> > overhead. 64 IOAM-Types is more than enough. >> > >> >> >> >> >> >> >> >> * Maturity: IOAM has several implementations, which were also show= n >> >> >> at >> >> >> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting addit= ional >> >> >> implementations >> >> >> to >> >> >> be publicized soon. Interoperable implementations need timely >> >> >> specifications. Despite the question being asked, the recent threa= d >> >> >> on >> >> >> OOAM >> >> >> in the NVO3 list hasn=E2=80=99t revealed any implementation of the= OOAM >> >> >> header. >> >> >> In >> >> >> addition, the thread revealed that several fundamental questions >> >> >> about >> >> >> the >> >> >> OOAM header are still open, such as whether or how active OAM >> >> >> mechanisms >> >> >> within protocols such as Geneve would apply to the OOAM header. Th= is >> >> >> ultimately means that we won=E2=80=99t get to a timely specificati= on. >> >> > >> >> > GIM>> May I ask which encapsulations supported by the implementatio= ns >> >> > you >> >> > refer to. Until very recently all iOAM proposals were to use >> >> > meta-data >> >> > TLV >> >> > in, e.g. Geneve and NSH. And if these or some of these >> >> > implementations >> >> > already updated to the newly proposed iOAM shim, I don't see proble= m >> >> > in >> >> > making them use OOAM Header. Would you agree? >> >> > >> >> >> >> >> >> * Scope: It isn=E2=80=99t entirely clear to which protocols the OO= AM header >> >> >> would >> >> >> ultimately apply to. The way the OOAM header is defined, OOAM uses= a >> >> >> 8-bit >> >> >> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some pro= tocols that IOAM >> >> >> data >> >> >> needs to be encapsulated into use 16-bits for their next protocol >> >> >> code >> >> >> points. See e.g. the GRE encapsulation =E2=80=93 as specified in >> >> >> draft-weis-ippm-ioam-gre-00. >> >> > >> >> > GIM>> The first paragraph of the Introduction section states: >> >> > New protocols that support overlay networks like VxLAN-GPE >> >> > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve >> >> > [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], >> >> > and >> >> > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. >> >> > Ethernet, IPv4/IPv6, and recognize Operations, Administration, a= nd >> >> > Maintenance (OAM) as one of distinct types. That ensures that >> >> > Overlay OAM (OOAM)packets are sharing fate with Overlay data >> >> > packet >> >> > traversing the underlay. >> >> > I'm updating the OOAM Header draft and along with cleaning nits wil= l >> >> > update >> >> > reference to GUE. I think that the list and the statemnt are quite >> >> > clear >> >> > in >> >> > identifying the scope of networks that may benefit from using not >> >> > only >> >> > common OOAM Header but common OOAM mechanisms, e.g. Echo >> >> > Request/Reply. >> >> > >> >> >> With the above in mind, I=E2=80=99d suggest that the WG moves forw= ard with >> >> >> specific definitions for encapsulating IOAM data into protocols = =E2=80=93 >> >> >> per >> >> >> the >> >> >> above mentioned drafts. >> >> >> >> >> >> >> >> >> >> >> >> Regards, Frank >> >> >> >> >> >> >> >> >> _______________________________________________ >> >> >> ippm mailing list >> >> >> ippm@ietf.org >> >> >> https://www.ietf.org/mailman/listinfo/ippm >> >> >> >> >> > >> >> > >> >> > _______________________________________________ >> >> > Int-area mailing list >> >> > Int-area@ietf.org >> >> > https://www.ietf.org/mailman/listinfo/int-area >> >> > >> >> >> >> _______________________________________________ >> >> ippm mailing list 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mapi id 15.00.1320.000; Sun, 15 Apr 2018 00:44:09 -0400 From: "Zafar Ali (zali)" To: Stewart Bryant , =?utf-8?B?5b6Q5bCP6JmOICAo5LmJ5YWIKQ==?= CC: "mpls@ietf.org" , mpls , "Robert Raszuk" , "sfc@ietf.org" , "Zafar Ali (zali)" , SPRING WG List Thread-Topic: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc Thread-Index: AQHT0vaFsFpi2EO1KU6mapxfK8o1IKQBQtEA Date: Sun, 15 Apr 2018 04:44:09 +0000 Message-ID: References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <1522554645079.8864@bell.ca> <1522812352107.5966@bell.ca> <489a9667-f159-4607-5834-b4bacf64989c@gmail.com> <09337fcf-64c9-450c-8dbc-ba8330611fe4.xiaohu.xxh@alibaba-inc.com> <6EE25554-3714-4A75-896F-24CC89BAA807@gmail.com> <5dab5411-0b08-4bd4-86ec-752e1803c3ff.xiaohu.xxh@alibaba-inc.com> <6bea41f6-5519-f512-92e5-a72bbd6187da@gmail.com> In-Reply-To: <6bea41f6-5519-f512-92e5-a72bbd6187da@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/10.9.0.180116 x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.164.200] Content-Type: multipart/alternative; boundary="_000_BD0B4559A1B84724B55DB11D6DE94278ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Apr 2018 04:44:16 -0000 --_000_BD0B4559A1B84724B55DB11D6DE94278ciscocom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 RGVhciBTdGV3YXJ0LCBXRyBDaGFpcnMgYW5kIHRoZSBXRywNCg0KSSBkbyBub3QgYWdyZWUgd2l0 aCBTdGV3YXJ04oCZcyBwb2ludHMgYW5kIHdpbGwgcmVzcG9uc2UgaW4gYSBzZXBhcmF0ZSBlbWFp bC4gQnV0IGFsbCB0aGF0IGlzIGp1c3Qgbm9pc2UgYW5kIHRoYXQgY2Fubm90IHJlc29sdmUgdGhl 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SMTP id s22-v6mr13391993oih.204.1523804176216; Sun, 15 Apr 2018 07:56:16 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a9d:1f3a:0:0:0:0:0 with HTTP; Sun, 15 Apr 2018 07:55:55 -0700 (PDT) In-Reply-To: References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <1522554645079.8864@bell.ca> <1522812352107.5966@bell.ca> <489a9667-f159-4607-5834-b4bacf64989c@gmail.com> <09337fcf-64c9-450c-8dbc-ba8330611fe4.xiaohu.xxh@alibaba-inc.com> <6EE25554-3714-4A75-896F-24CC89BAA807@gmail.com> <5dab5411-0b08-4bd4-86ec-752e1803c3ff.xiaohu.xxh@alibaba-inc.com> <6bea41f6-5519-f512-92e5-a72bbd6187da@gmail.com> From: "Andrew G. Malis" Date: Sun, 15 Apr 2018 10:55:55 -0400 Message-ID: To: "Zafar Ali (zali)" Cc: "mpls@ietf.org" , SPRING WG List , "sfc@ietf.org" , mpls Content-Type: multipart/alternative; boundary="000000000000a176360569e44e83" Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Apr 2018 14:56:22 -0000 --000000000000a176360569e44e83 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Zafar, et al, Perhaps the fairest to all concerned is for the MPLS WG to adopt both drafts, and then it will be up to the WG (rather than the authors) to best determine the technical details going forward, and how best to document them. That way the work becomes the consensus product of the WG. Cheers, Andy On Sun, Apr 15, 2018 at 12:44 AM, Zafar Ali (zali) wrote: > Dear Stewart, WG Chairs and the WG, > > > > I do not agree with Stewart=E2=80=99s points and will response in a separ= ate > email. But all that is just noise and that cannot resolve the issue at > hand. > > > > A countless time, Xiaohu has raised the issue that the intellectual > property for the contents in section 6 of draft-farrel-mpls-sfc belongs t= o > draft-xu-mpls-service-chaining. Please see one of Xiaohu's recent emails > with the subject *"[spring] For the fairness and justice of the IETF > culture"* dated Thursday, April 5, 2018 at 12:34 AM, copied in the > following. > > > > This issue was also raised by many during the WG adoption poll of the > document. The chairs adopted the work with the promise of fixing the issu= e. > Specifically, in the email to announce the adoption of the ID to the WG, > the chair(s) mentioned the following: > > > > "That decision is taken, the issues that has been pointed out are > > noted. These issues need to be resolved on the mailing list and > > rough consensus need to be reached for text changes in the document. > > Actually the members of the working group have much more influence on > > a working group document, than on an individual draft. > > It would be far better if we now focused on proposing text changes, > > rather than discussing processes." > > > > This is a serious issue; we need to remove section 6 from draft- > farrel-mpls-sfc to move forward. These contents will proceed in draft-xu*= , > where the contents started initially. Everyone will have a fair chance to > contribute to the contents as part of collaborations on draft-xu*. > > > > Thanks > > > > Regards =E2=80=A6 Zafar > > > > *From: *spring on behalf of "=E5=BE=90=E5=B0=8F= =E8=99=8E(=E4=B9=89=E5=85=88)" < > xiaohu.xxh@alibaba-inc.com> > *Date: *Thursday, April 5, 2018 at 12:34 AM > *To: *"mpls@ietf.org" , SPRING WG List > *Cc: *"ietf@ietf.org" > *Subject: *[spring] For the fairness and justice of the IETF culture//Re: > [mpls] What to do with draft-ietf-mpls-sfc-00.txt > > > > Hi all, > > > > As I had pointed out before, this draft describes two MPLS-based SFC > > approaches: one is how to encode the NSH info, more specifically, the SPI > > and SI info by two MPLS labels, which is still a stateful SFC mechanism > > just like NSH; another is how to leverage the MPLS-SR to realize a > > stateless SFC (see section 6). > > > > It has been pointed out by many people that section 6 of the draft copies > > the > > idea of (https://tools.ietf.org/html/draft-xu-mpls-service-chaining) > > without any technology contribution except replacing =E2=80=9CMPLS Segmen= t > > Routing=E2=80=9D by =E2=80=9CLabel Stack=E2=80=9D. Funnily, one author of= draft-ietf-mpls-sfc > > had inadvertently admitted > > "using a different name for the same thing is not so clever" (see > > https://mailarchive.ietf.org/arch/msg/mpls/y7FTc38ysVf6PyJlA04MEFSN9nc) i= n > > another thread. > > > > IMHO, the indulgence towards such behavior of copying > > ideas of existing drafts with word tricks would seriously trample > > underfoot the fairness and justice of the IETF culture. At least, it woul= d > > badly damage the interest and enthusiasm of IETF participants, especially > > newcomers and non-native speakers of English. > > > > Best regards, > > Xiaohu > > > > > > > > > > *From: *mpls on behalf of Stewart Bryant < > stewart.bryant@gmail.com> > *Date: *Friday, April 13, 2018 at 3:10 AM > *To: *"=E5=BE=90=E5=B0=8F=E8=99=8E(=E4=B9=89=E5=85=88)" > *Cc: *"mpls@ietf.org" , mpls , > Robert Raszuk , "sfc@ietf.org" > *Subject: *Re: [mpls] [sfc] Working Group adoption of > draft-farrel-mpls-sfc > > > > > > > > On 13/04/2018 08:23, =E5=BE=90=E5=B0=8F=E8=99=8E(=E4=B9=89=E5=85=88) wrot= e: > > Hi Stewart, > > > > Thanks for your response. For the SR-based SFC mechanism that has been > described in draft-xuclad*, it's not helpful to describe it again in > another draft. The most simple and efficient way to address the > overlapping issue is to reference draft-xuclad* rather than > "using a different name for the same thing". I'm looking forward to > seeing the revision of draft-farrel* that would address the overlapping > issue concretely. > > > Please read what I said. > > There are subtle but important technical differences between the two > approaches. > > - Stewart > > > > > If co-authors of draft-farrel* believed the current text as described in > draft-xuclad* is not good enough or misses something important, any > comments and suggestions are more than welcome. > > > I will send you some text to include in draft-xuclad that points to the > important differences in the approach taken in draft-farrel. This will > clarify the issue to the reader. > > I hope that this is an acceptable resolution of this issue. > > - Stewart > > > > > > Best regards, > > Xiaohu > > ------------------------------------------------------------------ > > Stewart Bryant > > 2018=E5=B9=B44=E6=9C=8813=E6=97=A5(=E6=98=9F=E6=9C=9F=E4=BA=94) 13:27 > > =E5=BE=90=E5=B0=8F=E8=99=8E(=E4=B9=89=E5=85=88) > > mpls ; "Bernier, Daniel" > ; Robert Raszuk > ; mpls@ietf.org > ; sfc@ietf.org > > Re: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc > > > > Hi Xiaohu > > > > What an earlier version of the draft said is of no importance. What it > says going forward is what counts. > > > > Perhaps the way to address your concern is to include some text of the > form that I used in my email of yesterday to describe to the reader the > difference in approach. This is consistent with earlier advice in this > discussion to reference the work from which this forked. > > > > - Stewart > > > > > > Sent from my iPad > > > On 13 Apr 2018, at 03:35, =E5=BE=90=E5=B0=8F=E8=99=8E(=E4=B9=89=E5=85=88)= wrote: > > Hi Stewart, > > > > If draft-farrel* was just describing an MPLS-based SFC technology that is > different from the MPLS-SR-based SFC technology that has been described i= n > draft-xuclad*, that would be fine. However, draft-farrel* also described > the technology that has been described in draft-xuclad* (see section 6) b= y > "using a different name for the same thing". Note that the title of > section 6 in those pervious versions of draft-farrel* is > > "MPLS Segment Routing". One co-author of draft-farrel* said they worked v= ery hard to change the "Segment Routing" term to "label stack" term in the = new version of draft-farrel* in order to deal with the overlapping issue. H= owever, such change is just "using a different name for the same thing", an= d it doesn't solve the overlapping issue at all, as had been pointed out by= many people. As said by one co-author of draft-farrel*, in a thread which = is irrelavant to this overlapping issue, "using a different name for the sa= me thing is not so clever:)". In fact, it would cause unneccessary confusio= ns to implementors by describing the same technology within different draft= s. More badly, it would set a bad precedant in the IETF of copying the idea= of the existing draft by "using a different name for the same thing". > > > > Best regards, > > Xiaohu > > ------------------------------------------------------------------ > > Stewart Bryant > > 2018=E5=B9=B44=E6=9C=8812=E6=97=A5(=E6=98=9F=E6=9C=9F=E5=9B=9B) 23:04 > > "Bernier, Daniel" ; Robert Raszuk < > robert@raszuk.net> > > mpls@ietf.org ; sfc@ietf.org > > Re: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc > > > > > Rather than have a process discussion, I think we should go up a level > and better understand the technical differences between the two drafts. > > draft-farrel-mpls-sfc describes the actions at a hop in terms of a tuple > that mirrors the SFC approach that allows a short indication of > potentially re-entrant chains. In its simplest form it uses a compact > MPLS stack to describe an arbitarily complex path that is compatile with > simple edge routers which are often challenged in terms of the number of > labels that they can push. > > draft-xu-clad-spring-sr-service-chaining unrolls the path and explicitly > calls out each hop and each function into the label stack. This results > in a much larger MPLS label stack that will challenge some edge routers. > The way that we generally deal with imposition limits is through the use > of binding-SIDs, which in the limiting case resolves to the approach in > draft-farrel with the limitation that the position on the path is > implicit in the label stack size rather than explicitly > specified by the SI. > > Mid-flight path changes (if such things are needed) is clearly simpler > with draft-farrel. > > The short stack in draft-farrel comes at the cost of greater network > forwarding stack, and the long stack is the price that draft-xu-clad > pays for the reduction in forwarding state. > > The optimal design point between forwarding and control plane state is > something that is dependent on many parameters, and is dependent on many > network and operational factors, so much so, that don't think it is wise > to rule either out of scope at this stage. > > The hybrid mode in section 6 of draft-farrel supports the mixed mode in > section 7 of the draft. This allows the construction of SFCs that are > the concatination of two or more compacted sub-chains. This allows the > operator to deploy a solution with the advantages of draft-farrel > together with some of the flexibility of draft-xu-clad. > > At this stage the two drafts are sufficienly different that I think we > need to proceed with both at least to the point where we fully > understand the detailed consequences of the two approachs and the > scenarios where each finds it's niche. > > After developing a better understanding the detail of each design, their > control plane, and operational contexts and how each maps to customer > network requirements, we can move the drafts to the appropriate IETF > track. Such tracks may be anything from abandonment to IETF standard for > one or both of these approaches. > > Meanwhile I think that we need to focus our efforts on a deeper > understanding of the technology and how each might make the Internet > work better, rather than spending effort on arguing about IETF process. > > - Stewart > > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls > > > > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls > > > > > > > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls > > --000000000000a176360569e44e83 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Zafar, et al,

Perhaps the fairest to al= l concerned is for the MPLS WG to adopt both drafts, and then it will be up= to the WG (rather than the authors) to best determine the technical detail= s going forward, and how best to document them. That way the work becomes t= he consensus product of the WG.

Cheers,
= Andy


On Sun, Apr 15, 2018 at 12:44 AM, Zafar Ali (zali) <zali@cisco= .com> wrote:

Dear Stewart, WG Chairs and the WG,

=C2=A0

I do not agree with Stewart=E2=80=99s points and wil= l response in a separate email. But all that is just noise and that cannot = resolve the issue at hand.

=C2=A0

A countless time, Xiaohu has raised the issue that t= he intellectual property for the contents in section 6 of draft-farrel-mpls= -sfc belongs to draft-xu-mpls-service-chaining. Please see one of Xiao= hu's recent emails with the subject "[spring] For the fairness and justice of the IETF culture" dated Thursday, April 5, 2018 at 12:34 AM, copied in the following.

=C2=A0

This issue was also rais= ed by many during the WG adoption poll of the document. The chairs adopted = the work with the promise of fixing the issue. Specifically, in the email t= o announce the adoption of the ID to the WG, the chair(s) mentioned the following:

=C2=A0

"That decision is t= aken, the issues that has been pointed out are

noted. These issues need to be resolved on the = mailing list and

rough consensus need to be reached for text cha= nges in the document.

Actually the members of the working group have = much more influence on

a working group document, than on an individual= draft.

It would be far better if we now focused on pro= posing text changes,

rather than discussing processes."<= u>

=C2=A0

This is a serious= issue; we need to remove section 6 from draft- farrel-mpls-sfc to m= ove forward. These contents will proceed in draft-xu*, where the contents s= tarted initially. Everyone will have a fair chance to contribute to the contents as part of collaborations on draft-xu= *.

=C2=A0

Thanks

=C2=A0

Regards =E2=80=A6 Zafar

=C2=A0

From= : spring <spring-bounces@ietf.= org> on behalf of "=E5=BE=90=E5=B0=8F=E8=99=8E(=E4=B9=89=E5=85=88)" <xiaohu= .xxh@alibaba-inc.com>
Date: Thursday, April 5, 2018 at 12:34 AM
To: "mpls@ie= tf.org" <mpl= s@ietf.org>, SPRING WG List <spring@ietf.org>
Cc: "ietf@ie= tf.org" <iet= f@ietf.org>
Subject: [spring] For the fairness and justice of the IETF culture//= Re: [mpls] What to do with draft-ietf-mpls-sfc-00.txt<= /p>

=C2=A0

Hi all,

=C2=A0

As I had pointed out before, this draft describes tw= o MPLS-based SFC

approaches: one is how to encode the NSH info, more = specifically, the SPI

and SI info by two MPLS labels, which is still a sta= teful SFC mechanism

just like NSH; another is how to leverage the MPLS-S= R to realize a

stateless SFC (see section 6).

=C2=A0

It has been pointed out by many people that section = 6 of the draft copies

the

idea of (https://tools.ietf.org/html/<= wbr>draft-xu-mpls-service-chaining)

without any technology contribution except replacing= =E2=80=9CMPLS Segment

Routing=E2=80=9D by =E2=80=9CLabel Stack=E2=80=9D. F= unnily, one author of draft-ietf-mpls-sfc

had inadvertently admitted

"using a different name for the same thing is n= ot so clever" (see

https://mailarchive.ietf.o= rg/arch/msg/mpls/y7FTc38ysVf6PyJlA04MEFSN9nc) in

another thread.

=C2=A0

IMHO, the indulgence towards such behavior of copyin= g

ideas of existing drafts with word tricks would seri= ously trample

underfoot the fairness and justice of the IETF cultu= re. At least, it would

badly damage the interest and enthusiasm of IETF par= ticipants, especially

newcomers and non-native speakers of English.=

=C2=A0

Best regards,

Xiaohu

=C2=A0

=C2=A0

=C2=A0

=C2=A0

From= : mpls <mpls-bounces@ietf.org> on behalf of Stewart Bryant <stewart.bryant@gmail.com>
Date: Friday, April 13, 2018 at 3:10 AM
To: "=E5=BE=90=E5=B0=8F=E8=99=8E(=E4=B9=89=E5=85=88)" <xiaohu= .xxh@alibaba-inc.com>
Cc: "mpls@ie= tf.org" <mpl= s@ietf.org>, mpls <mpls-bounces@ietf.org>, Robert Raszuk <robert@raszuk.net>, "= sfc@ietf.org" &l= t;sfc@ietf.org> Subject: Re: [mpls] [sfc] Working Group adoption of draft-farrel-mpl= s-sfc

=C2=A0

=C2=A0=

=C2=A0

On 13/04/2018 08:23, =E5=BE=90=E5= =B0=8F=E8=99=8E(=E4= =B9=89=E5=85=88) wrote:

Hi Stewart,

=C2=A0=

Thanks for your response. For the = SR-based SFC mechanism that has been described in draft-xuclad*, it's n= ot helpful to describe it again in another draft. Th= e most simple and efficient way to address the overlapping issue is to refe= rence draft-xuclad* rather than=C2=A0"using=C2=A0a=C2=A0different=C2=A0name=C2=A0fo= r=C2=A0the=C2=A0same=C2=A0thing". I'm looking forward to seeing the revision of draft-farrel* that would= address the overlapping issue concretely.


Please read what I said.

There are subtle but important technical differences between the two approa= ches.

- Stewart




If co-authors of draft-farrel* believed the current= text as described in draft-xuclad* is not good enough or misses something importan= t, any comments and suggestions are more than welcome.<= span style=3D"font-size:10.5pt;font-family:"Tahoma",sans-serif;co= lor:black">


I will send you some text to include in draft-xuclad that points to the imp= ortant differences in the approach taken in draft-farrel. This will clarify= the issue to the reader.

I hope that this is an acceptable resolution of this issue.

- Stewart





Best regards,

Xiaohu

------------------------------------------------------------------

2018=E5=B9= =B44=E6=9C=8813=E6=97=A5= (=E6=98=9F=E6=9C=9F=E4=BA=94) 13:27

=E5=BE=90=E5=B0=8F=E8=99=8E<= span>(=E4=B9=89=E5=85=88) <xiaohu.xxh@alibaba-inc.com><= span>

Re: [mpls] [sfc] Working Group ado= ption of draft-farrel-mpls-sfc

=C2=A0=

Hi Xiaohu

=C2=A0=

What an earlier version of the dra= ft said is of no importance. What it says going forward is what counts.<= /u>

=C2=A0=

Perhaps the way to address your co= ncern is to include some text of the form that I used in my email of yester= day to describe to the reader the difference in approach. This is consistent with= earlier advice in this discussion to reference the work from which this fo= rked.

=C2=A0=

- Stewart

=C2=A0=

= =C2=A0

Sent from my iPad

On 13 Apr 2018, at 03:35, =E5=BE=90=E5=B0=8F=E8=99= =8E(=E4=B9=89= =E5=85=88) <xiaohu.xxh@alibaba-inc.com> wrote:

Hi Stewart,

=C2=A0=

If draft-farrel* was just describi= ng an MPLS-based SFC technology that is different from the MPLS-SR-based SF= C technology that has been described in draft-xuclad*, that would be fine. However, dra= ft-farrel* also described the technology that has been described in draft-x= uclad* (see section 6) by "using=C2=A0a=C2=A0different=C2=A0nam= e=C2=A0for=C2=A0the=C2=A0same=C2=A0thing". Note that the t= itle of section 6 in those pervious versions of draft-farrel* is=C2=A0 

"MPLS Segment Routing". On=
e co-author of draft-farrel* said they=C2=A0worked very hard to change the =
"Segment Routing" term to "label stack" term in the new=
 version of draft-farrel* in order to deal with the overlapping issue. Howe=
ver, such change is just "using=C2=A0a=C2=A0different=
=C2=A0name=C2=A0for=C2=A0the=C2=A0same=C2=A0thing<=
span style=3D"font-size:10.5pt;font-family:"Tahoma",sans-serif;co=
lor:black;background:white">", and it doesn't solve the overlappin=
g issue at all, as had been pointed out by many people. As said by one co-author of draft-farrel*, in a thread whic=
h is irrelavant to this overlapping issue,=C2=A0"using=C2=A0a=C2=A0different=C2=A0name=C2=A0for=C2=A0the=C2=
=A0same=C2=A0thing is not so clever:)". In fact, it would cause unnecc=
essary confusions to implementors by describing the same technology within =
different drafts. More badly, it would set a bad precedant in the IETF of c=
opying the idea of the existing draft by "using=C2=A0a=C2=A0different=
=C2=A0name=C2=A0for=C2=A0the=C2=A0same=C2=A0thing".=



Best regards,=

Xiaohu=

------------------------------------------------------------------

Stewart Bryant <<= a href=3D"mailto:stewart.bryant@gmail.com" target=3D"_blank">stewart.= bryant@gmail.com>

2018=E5=B9= =B44=E6=9C=8812=E6=97=A5= (=E6=98=9F=E6=9C=9F=E5=9B=9B) 23:04

"Bernier, Daniel" <daniel.bernier@bell.ca>; Robert Raszuk <robert@raszuk.net>

Re: [mpls] [sfc] Working Group ado= ption of draft-farrel-mpls-sfc

=C2=A0=


Rather=C2=A0than=C2=A0have=C2=A0a=C2=A0process=C2=A0discussion,=C2=A0I= =C2=A0think=C2=A0we=C2=A0should=C2=A0go=C2=A0up=C2=A0a=C2=A0level=C2= =A0
and=C2=A0better=C2=A0understand=C2=A0the=C2=A0technical=C2=A0differenc= es=C2=A0between=C2=A0the=C2=A0two=C2=A0drafts.

draft-farrel-mpls-sfc=C2=A0describes=C2=A0the=C2=A0actions=C2=A0at=C2= =A0a=C2=A0hop=C2=A0in=C2=A0terms=C2=A0of=C2=A0a=C2=A0tuple=C2=A0
that=C2=A0mirrors=C2=A0the=C2=A0SFC=C2=A0approach=C2=A0that=C2=A0allow= s=C2=A0a=C2=A0short=C2=A0indication=C2=A0of=C2=A0
potentially=C2=A0re-entrant=C2=A0chains.=C2=A0In=C2=A0its=C2=A0simples= t=C2=A0form=C2=A0it=C2=A0uses=C2=A0a=C2=A0compact=C2=A0
MPLS=C2=A0stack=C2=A0to=C2=A0describe=C2=A0an=C2=A0arbitarily=C2=A0com= plex=C2=A0path=C2=A0that=C2=A0is=C2=A0compatile=C2=A0with=C2=A0
simple=C2=A0edge=C2=A0routers=C2=A0which=C2=A0are=C2=A0often=C2=A0chal= lenged=C2=A0in=C2=A0terms=C2=A0of=C2=A0the=C2=A0number=C2=A0of=C2=A0 labels=C2=A0that=C2=A0they=C2=A0can=C2=A0push.

draft-xu-clad-spring-sr-service-chaining=C2=A0unrolls=C2=A0the=C2=A0path=C2=A0and=C2=A0explicitly=C2=A0
calls=C2=A0out=C2=A0each=C2=A0hop=C2=A0and=C2=A0each=C2=A0function=C2= =A0into=C2=A0the=C2=A0label=C2=A0stack.=C2=A0This=C2=A0results=C2=A0 in=C2=A0a=C2=A0much=C2=A0larger=C2=A0MPLS=C2=A0label=C2=A0stack=C2=A0t= hat=C2=A0will=C2=A0challenge=C2=A0some=C2=A0edge=C2=A0routers.=C2=A0 The=C2=A0way=C2=A0that=C2=A0we=C2=A0generally=C2=A0deal=C2=A0with=C2= =A0imposition=C2=A0limits=C2=A0is=C2=A0through=C2=A0the=C2=A0use=C2=A0=
of=C2=A0binding-SIDs,=C2=A0which=C2=A0in=C2=A0the=C2=A0limiting=C2=A0c= ase=C2=A0resolves=C2=A0to=C2=A0the=C2=A0approach=C2=A0in=C2=A0
draft-farrel=C2=A0with=C2=A0the=C2=A0limitation=C2=A0that=C2=A0the=C2= =A0position=C2=A0on=C2=A0the=C2=A0path=C2=A0is=C2=A0
implicit=C2=A0in=C2=A0the=C2=A0label=C2=A0stack=C2=A0size=C2=A0rather= =C2=A0than=C2=A0explicitly=C2=A0specified=C2=A0by=C2=A0the=C2=A0SI.
Mid-flight=C2=A0path=C2=A0changes=C2=A0(if=C2=A0such=C2=A0things=C2=A0= are=C2=A0needed)=C2=A0is=C2=A0clearly=C2=A0simpler=C2=A0
with=C2=A0draft-farrel.

The=C2=A0short=C2=A0stack=C2=A0in=C2=A0draft-farrel=C2=A0comes=C2=A0at= =C2=A0the=C2=A0cost=C2=A0of=C2=A0greater=C2=A0network=C2=A0
forwarding=C2=A0stack,=C2=A0and=C2=A0the=C2=A0long=C2=A0stack=C2=A0is= =C2=A0the=C2=A0price=C2=A0that=C2=A0draft-xu-clad=C2=A0
pays=C2=A0for=C2=A0the=C2=A0reduction=C2=A0in=C2=A0forwarding=C2=A0sta= te.

The=C2=A0optimal=C2=A0design=C2=A0point=C2=A0between=C2=A0forwarding= =C2=A0and=C2=A0control=C2=A0plane=C2=A0state=C2=A0is=C2=A0
something=C2=A0that=C2=A0is=C2=A0dependent=C2=A0on=C2=A0many=C2=A0para= meters,=C2=A0and=C2=A0is=C2=A0dependent=C2=A0on=C2=A0many=C2=A0
network=C2=A0and=C2=A0operational=C2=A0factors,=C2=A0so=C2=A0much=C2= =A0so,=C2=A0that=C2=A0don't=C2=A0think=C2=A0it=C2=A0is=C2=A0wise= =C2=A0
to=C2=A0rule=C2=A0either=C2=A0out=C2=A0of=C2=A0scope=C2=A0at=C2=A0this= =C2=A0stage.

The=C2=A0hybrid=C2=A0mode=C2=A0in=C2=A0section=C2=A06=C2=A0of=C2=A0dra= ft-farrel=C2=A0supports=C2=A0the=C2=A0mixed=C2=A0mode=C2=A0in=C2=A0 section=C2=A07=C2=A0of=C2=A0the=C2=A0draft.=C2=A0This=C2=A0allows=C2= =A0the=C2=A0construction=C2=A0of=C2=A0SFCs=C2=A0that=C2=A0are=C2=A0 the=C2=A0concatination=C2=A0of=C2=A0two=C2=A0or=C2=A0more=C2=A0compact= ed=C2=A0sub-chains.=C2=A0This=C2=A0allows=C2=A0the=C2=A0
operator=C2=A0to=C2=A0deploy=C2=A0a=C2=A0solution=C2=A0with=C2=A0the= =C2=A0advantages=C2=A0of=C2=A0draft-farrel=C2=A0
together=C2=A0with=C2=A0some=C2=A0of=C2=A0the=C2=A0flexibility=C2=A0of= =C2=A0draft-xu-clad.

At=C2=A0this=C2=A0stage=C2=A0the=C2=A0two=C2=A0drafts=C2=A0are=C2=A0su= fficienly=C2=A0different=C2=A0that=C2=A0I=C2=A0think=C2=A0we=C2=A0
need=C2=A0to=C2=A0proceed=C2=A0with=C2=A0both=C2=A0at=C2=A0least=C2=A0= to=C2=A0the=C2=A0point=C2=A0where=C2=A0we=C2=A0fully=C2=A0
understand=C2=A0the=C2=A0detailed=C2=A0consequences=C2=A0of=C2=A0the= =C2=A0two=C2=A0approachs=C2=A0and=C2=A0the=C2=A0
scenarios=C2=A0where=C2=A0each=C2=A0finds=C2=A0it's=C2=A0niche.
After=C2=A0developing=C2=A0a=C2=A0better=C2=A0understanding=C2=A0the= =C2=A0detail=C2=A0of=C2=A0each=C2=A0design,=C2=A0their=C2=A0
control=C2=A0plane,=C2=A0and=C2=A0operational=C2=A0contexts=C2=A0and= =C2=A0how=C2=A0each=C2=A0maps=C2=A0to=C2=A0customer=C2=A0
network=C2=A0requirements,=C2=A0we=C2=A0can=C2=A0move=C2=A0the=C2=A0dr= afts=C2=A0to=C2=A0the=C2=A0appropriate=C2=A0IETF=C2=A0
track.=C2=A0Such=C2=A0tracks=C2=A0may=C2=A0be=C2=A0anything=C2=A0from= =C2=A0abandonment=C2=A0to=C2=A0IETF=C2=A0standard=C2=A0for=C2=A0
one=C2=A0or=C2=A0both=C2=A0of=C2=A0these=C2=A0approaches.

Meanwhile=C2=A0I=C2=A0think=C2=A0that=C2=A0we=C2=A0need=C2=A0to=C2=A0f= ocus=C2=A0our=C2=A0efforts=C2=A0on=C2=A0a=C2=A0deeper=C2=A0
understanding=C2=A0of=C2=A0the=C2=A0technology=C2=A0and=C2=A0how=C2=A0= each=C2=A0might=C2=A0make=C2=A0the=C2=A0Internet=C2=A0
work=C2=A0better,=C2=A0=C2=A0rather=C2=A0than=C2=A0spending=C2=A0effor= t=C2=A0on=C2=A0arguing=C2=A0about=C2=A0IETF=C2=A0process.

-=C2=A0Stewart

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Herbert CC: NVO3 , "int-area@ietf.org" , "Service Function Chaining IETF list" , IETF IPPM WG Thread-Topic: [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AQHT01Rv7uw9TGdqO0+V2HJ61OA6MaQC+nQw Date: Mon, 16 Apr 2018 07:08:16 +0000 Message-ID: References: In-Reply-To: Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.55.117.7] Content-Type: multipart/alternative; boundary="_000_fb963e482d074551853ce83816f24c7fXCHRCD008ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Apr 2018 07:08:23 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[ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Apr 2018 08:37:41 -0000 --_000_BBA82579FD347748BEADC4C445EA0F21A6D62FA3NKGEML515MBXchi_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgRnJhbmssDQoNCkhvdyBkb2VzIGEgZm9yd2FyZGVyIGtub3cgd2hlbiBhbmQgd2hlcmUgdG8g aW5zZXJ0IHRoZSBkYXRhPw0KSW4gdGhlIGNhc2Ugb2YgR2VuZXZlIG92ZXIgSVB2NiwgZG8geW91 IG1lYW4gdGhlIGRldmljZSBuZWVkIHRvIHNjYW4gYWxsIHRoZSBwcm90b2NvbCBzdGFjaz8gT3Ig anVzdCB0aGUgb3V0ZXIgZW5jYXBzdWxhdGlvbj8NCg0KVGlhbnJhbg0KDQpGcm9tOiBpcHBtIFtt YWlsdG86aXBwbS1ib3VuY2VzQGlldGYub3JnXSBPbiBCZWhhbGYgT2YgRnJhbmsgQnJvY2tuZXJz IChmYnJvY2tuZSkNClNlbnQ6IE1vbmRheSwgQXByaWwgMTYsIDIwMTggMzowOCBQTQ0KVG86IE1p 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Function Chaining IETF list" , IETF IPPM WG Thread-Topic: [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AQHT01Rv7uw9TGdqO0+V2HJ61OA6MaQC+nQwgABu/4D//63XQA== Date: Mon, 16 Apr 2018 08:51:01 +0000 Message-ID: <8d1b3bb4a1794c4fac3455257e0ab60e@XCH-RCD-008.cisco.com> References: In-Reply-To: Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.55.117.7] Content-Type: multipart/alternative; boundary="_000_8d1b3bb4a1794c4fac3455257e0ab60eXCHRCD008ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: 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[194.213.3.17]) (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 2D39F1275F4; Mon, 16 Apr 2018 02:22:49 -0700 (PDT) Received: from lhreml703-cah.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id 26ED499431D91; Mon, 16 Apr 2018 10:06:35 +0100 (IST) Received: from NKGEML411-HUB.china.huawei.com (10.98.56.70) by lhreml703-cah.china.huawei.com (10.201.108.44) with Microsoft SMTP Server (TLS) id 14.3.382.0; Mon, 16 Apr 2018 10:06:36 +0100 Received: from NKGEML515-MBX.china.huawei.com ([fe80::a54a:89d2:c471:ff]) by nkgeml411-hub.china.huawei.com ([10.98.56.70]) with mapi id 14.03.0361.001; Mon, 16 Apr 2018 17:06:31 +0800 From: Tianran Zhou To: "Frank Brockners (fbrockne)" , Mickey Spiegel , Tom Herbert CC: NVO3 , "int-area@ietf.org" , "Service Function Chaining IETF list" , IETF IPPM WG Thread-Topic: [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AQHT0qfYMJmDjLfNRU+b5k8Wa55hLqP9MIyAgABxbYCAANtOAIAD+q4AgACbFcD//4GggIAAiFIg Date: Mon, 16 Apr 2018 09:06:31 +0000 Message-ID: References: <8d1b3bb4a1794c4fac3455257e0ab60e@XCH-RCD-008.cisco.com> In-Reply-To: <8d1b3bb4a1794c4fac3455257e0ab60e@XCH-RCD-008.cisco.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.156.116] Content-Type: multipart/alternative; boundary="_000_BBA82579FD347748BEADC4C445EA0F21A6D62FD6NKGEML515MBXchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Apr 2018 09:22:53 -0000 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alln-core-4.cisco.com ([173.36.13.137]) by rcdn-iport-7.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 Apr 2018 10:16:45 +0000 Received: from XCH-ALN-009.cisco.com (xch-aln-009.cisco.com [173.36.7.19]) by alln-core-4.cisco.com (8.14.5/8.14.5) with ESMTP id w3GAGju4022396 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Mon, 16 Apr 2018 10:16:45 GMT Received: from xch-aln-008.cisco.com (173.36.7.18) by XCH-ALN-009.cisco.com (173.36.7.19) with Microsoft SMTP Server (TLS) id 15.0.1320.4; Mon, 16 Apr 2018 05:16:44 -0500 Received: from xch-aln-008.cisco.com ([173.36.7.18]) by XCH-ALN-008.cisco.com ([173.36.7.18]) with mapi id 15.00.1320.000; Mon, 16 Apr 2018 05:16:44 -0500 From: "Shwetha Bhandari (shwethab)" To: Tianran Zhou , "Frank Brockners (fbrockne)" , Mickey Spiegel , "Tom Herbert" CC: NVO3 , "int-area@ietf.org" , "Service Function Chaining IETF list" , IETF IPPM WG Thread-Topic: [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AQHT0qfTQwTS8ElgNEuPyExTOQTetaP+CnqAgABxbYCAANtOAIAD+q4AgAAY6YCAAAPMgIAABFWA//+eRIA= Date: Mon, 16 Apr 2018 10:16:44 +0000 Message-ID: References: <8d1b3bb4a1794c4fac3455257e0ab60e@XCH-RCD-008.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/f.1a.0.160910 x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.65.34.41] Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha256; boundary="B_3606738403_1795904286" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Apr 2018 10:16:53 -0000 --B_3606738403_1795904286 Content-type: multipart/alternative; boundary="B_3606738403_1014226000" --B_3606738403_1014226000 Content-type: text/plain; charset="UTF-8" Content-transfer-encoding: quoted-printable Hi Tianran, > If I recall right, it is not written in the ioam data draft. Data draft is defining the data to be carried in IOAM in an encapsulation a= gnostic way, it does not specify how the encapsulation protocol is configure= d. =20 > Yes, node by node configuration is an easy way. While it is, it does not have to be a node by node configuration. It can be= part of the encapsulation definition.=20 For e.g. If the encapsulation is IPv6 and if we define the data to be carri= ed as HbH options, then based on the Option Type with highest order 2 bits s= et to 00 then the v6 nodes that implement IOAM will process the option and o= thers will skip over. =20 =20 Thanks, Shwetha =20 From: ippm on behalf of Tianran Zhou Date: Monday, April 16, 2018 at 2:36 PM To: "Frank Brockners (fbrockne)" , Mickey Spiegel , Tom Herbert Cc: NVO3 , "int-area@ietf.org" , Service = Function Chaining IETF list , IETF IPPM WG Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various protoc= ols - follow up from WG discussion in London =20 Hi Frank, =20 If I recall right, it is not written in the ioam data draft. Yes, node by node configuration is an easy way. In the draft-zhou-ippm-ioam= -yang, we have the =E2=80=9Cprotocol-type=E2=80=9D to indicate the layering. +--rw ioam +--rw ioam-profiles +--rw enabled? boolean +--rw ioam-profile* [profile-name] +--rw profile-name string +--rw filter | +--rw filter-type? ioam-filter-type | +--rw acl-name? -> /acl:acls/acl/name +--rw protocol-type? ioam-protocol-type +--rw incremental-tracing-profile {incremental-trace}? | ... +--rw preallocated-tracing-profile {preallocated-trace}? | ... +--rw pot-profile {proof-of-transit}? | ... +--rw e2e-profile {edge-to-edge}? ... =20 =20 Tianran From: Frank Brockners (fbrockne) [mailto:fbrockne@cisco.com]=20 Sent: Monday, April 16, 2018 4:51 PM To: Tianran Zhou ; Mickey Spiegel ; Tom Herbert Cc: NVO3 ; int-area@ietf.org; Service Function Chaining IETF= list ; IETF IPPM WG Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various protoc= ols - follow up from WG discussion in London =20 Hi Tianran, =20 IOAM is a domain specific feature (see also draft-ietf-ippm-ioam-data-02 se= ctions 3 and 4), which allows an operator to control by means of configurati= on where and for which traffic IOAM data fields are added/updated/removed fr= om the customer traffic. Using your example of Geneve over IPv6 =E2=80=93 with IOA= M data in both the Geneve and the IPv6 protocol, one would expect that the o= perator configures the endpoints of the Geneve tunnel to operate on the IOAM= data in Geneve, and the IPv6 routers that the Geneve tunnel traverses to op= erate on the IOAM data in IPv6.=20 =20 Frank =20 From: Tianran Zhou =20 Sent: Montag, 16. April 2018 10:37 To: Frank Brockners (fbrockne) ; Mickey Spiegel ; Tom Herbert Cc: NVO3 ; int-area@ietf.org; Service Function Chaining IETF= list ; IETF IPPM WG Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various protoc= ols - follow up from WG discussion in London =20 Hi Frank, =20 How does a forwarder know when and where to insert the data?=20 In the case of Geneve over IPv6, do you mean the device need to scan all th= e protocol stack? Or just the outer encapsulation? =20 Tianran =20 From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Frank Brockners (fbr= ockne) Sent: Monday, April 16, 2018 3:08 PM To: Mickey Spiegel ; Tom Herbert Cc: NVO3 ; int-area@ietf.org; Service Function Chaining IETF= list ; IETF IPPM WG Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various protoc= ols - follow up from WG discussion in London =20 =20 Tom, =20 a quick addition to what Mickey mentioned below: What you seem to have in m= ind is what draft-ietf-ippm-ioam-data-02 refers to as =E2=80=9Clayering=E2=80=9D (see se= ction 3.), i.e. if you=E2=80=99re running for example Geneve over IPv6, then IOAM = data could be encapsulated in both protocols, Geneve and IPv6 =E2=80=93 giving you= visibility into the =E2=80=9Cunderlay=E2=80=9D (IPv6) and the =E2=80=9Coverlay=E2=80=9D (Geneve).=20 =20 Frank =20 From: ippm On Behalf Of Mickey Spiegel Sent: Freitag, 13. April 2018 20:22 To: Tom Herbert Cc: NVO3 ; int-area@ietf.org; Service Function Chaining IETF= list ; IETF IPPM WG Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various protoc= ols - follow up from WG discussion in London =20 Tom, =20 On Thu, Apr 12, 2018 at 10:17 PM, Tom Herbert wrote: Mickey, Looking at these ippm drafts more closely, I have a much more fundamental concern. In draft-brockners-ippm-ioam-geneve-00 for instance, there is the text in the introduction: "In-situ OAM (IOAM) records OAM information within the packet while the packet traverses a particular network domain. The term "in-situ" refers to the fact that the IOAM data fields are added to the data packets rather than is being sent within packets specifically dedicated to OAM. This document defines how IOAM data fields are transported as part of the Geneve [I-D.ietf-nvo3-geneve] encapsulation." I assume this means that as packets with Geneve encapsulation traverse the network they are interpreted by intermediate nodes as being Geneve. Since Geneve is a UDP encapsulation, then the destination UDP port number would be used to identify packets as being Geneve. So an intermediate device might be looking for UDP packets destined to port 6081 (the assigned UDP port for Geneve). If my understanding is correct, then this is a problem. UDP port numbers do not have global meaning. An intermediate device may very well see UDP packets destined to port 6081 that are not actually Geneve. This scenario is discussed in RFC7605: "...intermediate device interprets traffic based on the port number. It is important to recognize that any interpretation of port numbers -- except at the endpoints -- may be incorrect, because port numbers are meaningful only at the endpoints." If the UDP data is modified, as the draft would imply, then misinterpretation may also mean silent data corruption of packets. A protocol that would allow this seems pretty incorrect! Note that this would be true also for any UDP encapsulation that the network tries to interpret. =20 The intention is to allow for multiple nodes that a packet traverses to be able to insert IOAM node information in the same trace option, but leave some flexibility regarding which nodes actually do the IOAM processing and the node information. This may vary depending on the transport. =20 In case of a tunneled encapsulation such as Geneve or VXLAN, there may still be multiple hops. For example a network may use Geneve or VXLAN, but only do L2 processing at ToRs, with L3 processing done at aggregation or core switches. In this case many packets would do 2 Geneve or VXLAN hops, so the packet would contain IOAM node information from two nodes. =20 Another example is service function chaining using Geneve or VXLAN rather than NSH. =20 I am also wondering if hop-by-hop options been considered for this application? Their interpretation in the network is unabiguous and they also have the advantage that the work with any IP protocol or encapsulation. =20 IPv6 hop-by-hop options has been considered. See draft-brockners-inband-oam-transport-05. This has not yet been broken out into a separate draft. =20 Mickey =20 Thanks, Tom On Thu, Apr 12, 2018 at 3:31 PM, Mickey Spiegel wrote: > Tom, > > On Thu, Apr 12, 2018 at 2:46 PM, Tom Herbert wrote: >> >> On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky >> wrote: >> > Hi Frank, >> > thank you for sharing your points. Please find my notes in-line and >> > tagged >> > GIM>>. I believe that this is very much relevant to work of other >> > working >> > groups that directly work on the overlay encapsulations in the center = of >> > the >> > discussion and hence I've added them to the list. Hope we'll have more >> > opinions to reach the conclusion that is acceptable to all. >> > >> > Regards, >> > Greg >> > >> > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) >> > wrote: >> >> >> >> Back at the IPPM meeting in London, we discussed several drafts deali= ng >> >> with the encapsulation of IOAM data in various protocols >> >> (draft-brockners-ippm-ioam-vxlan-gpe-00, >> >> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). On= e >> >> discussion topic that we decided to take to the list was the question >> >> on >> >> whether draft-ooamdt-rtgwg-ooam-header could be leveraged.. After >> >> carefully >> >> considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusion >> >> that >> >> the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM: >> >> >> >> * Efficiency: IOAM adds data to live user traffic. As such, an >> >> encapsulation needs to be as efficient as possible. The =E2=80=9COOAM heade= r=E2=80=9D >> >> is 8 >> >> bytes long. The approach for IOAM data encapsulation in the above >> >> mentioned >> >> drafts only requires 4 bytes. Using the OOAM header approach would ad= d >> >> an >> >> unnecessary overhead of 4 bytes =E2=80=93 which is significant. >> Greg, >> >> I'm missing something here. I looked at the drafts you referenced and >> each of them looks like the overhead for OAM is greater that four >> bytes. In each there is some overhead equivalent to type/length, for >> instance in Geneve four bytes are needed for option class, type, and >> length. Unless the the OAM data is zero length, I don't see how this >> adds up to only four bytes of overhead. > > > The four versus eight bytes just refers to the fields in the four bytes o= f > IOAM > info, that is common to all IOAM options. Beyond that, there are IOAM opt= ion > specific fields. For example if doing one of the IOAM trace options, ther= e > are > four bytes of trace option header, including the IOAM-trace-type, NodeLen= , > Flags, and RemainingLen fields. These are followed by the node data list > containing the per hop IOAM information. > > In looking at the OOAM header content, it has nothing to do with any of t= he > IOAM information after the first four bytes. It contains another variant = of > the > information in the first four bytes of IOAM info, spread out over eight > bytes. > >> >> Tom >> >> > >> > GIM>> The difference in four octets is because OOAM Header: >> > >> > provides more flexibility, e.g. Flags field and Reserved fields; > > > The flags field only has one defined flag at the moment, for a timestamp > block. For IOAM trace we need per hop timestamps, which the timestamp > block cannot address, i.e. the timestamp block is redundant for IOAM. > >> >> > supports larger OAM packets than iOAM header; > > > For IOAM purposes, 1020 octets is more than enough. > >> >> > is future proof by supporting versioning (Version field). > > > IMO, taking the first two bits of the IOAM-Type to define a Version field > would be a good thing. This does not require adding four more bytes of > overhead. 64 IOAM-Types is more than enough. > >> >> >> >> >> * Maturity: IOAM has several implementations, which were also shown a= t >> >> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting additional implement= ations >> >> to >> >> be publicized soon. Interoperable implementations need timely >> >> specifications. Despite the question being asked, the recent thread o= n >> >> OOAM >> >> in the NVO3 list hasn=E2=80=99t revealed any implementation of the OOAM hea= der. >> >> In >> >> addition, the thread revealed that several fundamental questions abou= t >> >> the >> >> OOAM header are still open, such as whether or how active OAM >> >> mechanisms >> >> within protocols such as Geneve would apply to the OOAM header. This >> >> ultimately means that we won=E2=80=99t get to a timely specification. >> > >> > GIM>> May I ask which encapsulations supported by the implementations >> > you >> > refer to. Until very recently all iOAM proposals were to use meta-data >> > TLV >> > in, e.g. Geneve and NSH. And if these or some of these implementations >> > already updated to the newly proposed iOAM shim, I don't see problem i= n >> > making them use OOAM Header. Would you agree? >> > >> >> >> >> * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM header >> >> would >> >> ultimately apply to. The way the OOAM header is defined, OOAM uses a >> >> 8-bit >> >> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protocols that IOA= M data >> >> needs to be encapsulated into use 16-bits for their next protocol cod= e >> >> points. See e.g. the GRE encapsulation =E2=80=93 as specified in >> >> draft-weis-ippm-ioam-gre-00. >> > >> > GIM>> The first paragraph of the Introduction section states: >> > New protocols that support overlay networks like VxLAN-GPE >> > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve >> > [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], an= d >> > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. >> > Ethernet, IPv4/IPv6, and recognize Operations, Administration, and >> > Maintenance (OAM) as one of distinct types. That ensures that >> > Overlay OAM (OOAM)packets are sharing fate with Overlay data packet >> > traversing the underlay. >> > I'm updating the OOAM Header draft and along with cleaning nits will >> > update >> > reference to GUE. I think that the list and the statemnt are quite cle= ar >> > in >> > identifying the scope of networks that may benefit from using not only >> > common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply= . >> > >> >> With the above in mind, I=E2=80=99d suggest that the WG moves forward with >> >> specific definitions for encapsulating IOAM data into protocols =E2=80=93 p= er >> >> the >> >> above mentioned drafts. >> >> >> >> >> >> >> >> Regards, Frank >> >> >> >> >> >> _______________________________________________ >> >> ippm mailing list >> >> ippm@ietf.org >> >> https://www.ietf.org/mailman/listinfo/ippm >> >> >> > >> > >> > _______________________________________________ >> > Int-area mailing list >> > Int-area@ietf.org >> > https://www.ietf.org/mailman/listinfo/int-area >> > >> >> _______________________________________________ >> ippm mailing list >> ippm@ietf.org >> https://www.ietf.org/mailman/listinfo/ippm > > =20 --B_3606738403_1014226000 Content-type: text/html; charset="UTF-8" Content-transfer-encoding: quoted-printable

Hi Tianran,

> If I recall right, it is not wr= itten in the ioam data draft.

Data draft is defining the data= to be carried in IOAM in an encapsulation agnostic way, it does not specify= how the encapsulation protocol is configured.

 

> Yes, node by node configurati= on is an easy way.

While it is, it does not have to be a node= by node configuration. It can be part of the encapsulation definition.

For e.g. If the encapsulation is IPv6 and if we define the data = to be carried as HbH options, then based on the Option Type with highest ord= er 2 bits set to 00 then the v6 nodes that implement IOAM will process the o= ption and others will skip over.

 

=

&= nbsp;

Thanks,

Shwetha

 

From: = ippm <ippm-bounc= es@ietf.org> on behalf of Tianran Zhou <zhoutianran@huawei.com>
= Date: Monday, April 16, 2018 at 2:36 PM
To: "Frank Bro= ckners (fbrockne)" <fbrockne@cisco.com>, Mickey Spiegel <mspie= gel@barefootnetworks.com>, Tom Herbert <tom@herbertland.com>
= Cc: NVO3 <nvo3@ietf.org>, "int-area@ietf.org" <int-ar= ea@ietf.org>, Service Function Chaining IETF list <sfc@ietf.org>, I= ETF IPPM WG <ippm@ietf.org>
Subject: Re: [ippm] [Int-area] e= ncapsulation of IOAM data in various protocols - follow up from WG discussio= n in London

 

Hi Frank,

 

If I recall right, it is not written in the ioam = data draft.

Yes, node by node configuration i= s an easy way. In the draft-zhou-ippm-ioam-yang, we have the “protocol-type” to indicate the layering.

   +--rw ioam

&nb= sp;     +--rw ioam-profiles

         +--rw enabled? &nbs= p;      boolean

&nbs= p;        +--rw ioam-profile* [profile-na= me]

       = ;     +--rw profile-name     &n= bsp;            =   string

     &= nbsp;      +--rw filter

            |&nbs= p; +--rw filter-type?   ioam-filter-type

            |&n= bsp; +--rw acl-name?      -> /acl:acls/acl/name<= /span>

       &nb= sp;    +--rw protocol-type?     &nbs= p;            ioam-pr= otocol-type

     &nb= sp;      +--rw incremental-tracing-profile {increme= ntal-trace}?

     &n= bsp;      |  ...

            +--rw p= reallocated-tracing-profile {preallocated-trace}?

            |&nb= sp; ...

      &= nbsp;     +--rw pot-profile {proof-of-transit}?

         = ;   |  ...

   &= nbsp;        +--rw e2e-profile {edge-to-e= dge}?

      &nb= sp;        ...

 

 

Tianran

From: Frank Brockners (fbrockne) [mailto:fbr= ockne@cisco.com]
Sent: Monday, April 16, 2018 4:51 PM
To: Tianran Zhou <zhoutianran@huawei.com>; Mickey Spiegel <mspiegel@= barefootnetworks.com>; Tom Herbert <tom@herbertland.com>
Cc:<= /b> NVO3 <nvo3@ietf.org>; int-area@ietf.org; Service Function Chaining= IETF list <sfc@ietf.org>; IETF IPPM WG <ippm@ietf.org>
Su= bject: RE: [ippm] [Int-area] encapsulation of IOAM data in various proto= cols - follow up from WG discussion in London

 

Hi Tianran,

 

IOA= M is a domain specific feature (see also draft-ietf-ippm-ioam-data-02 sectio= ns 3 and 4), which allows an operator to control by means of configuration w= here and for which traffic IOAM data fields are added/updated/removed from t= he customer traffic. Using your example of Geneve over IPv6 – with IOA= M data in both the Geneve and the IPv6 protocol, one would expect that the o= perator configures the endpoints of the Geneve tunnel to operate on the IOAM= data in Geneve, and the IPv6 routers that the Geneve tunnel traverses to op= erate on the IOAM data in IPv6.

 

= Frank

 <= o:p>

From: Tianran Zhou <zhout= ianran@huawei.com>
Sent: Montag, 16. April 2018 10:37
<= b>To: Frank Brockners (fbrockne) <fbrockne@cisco.com>; Mickey Spiegel <mspiegel@barefootnetworks.com>; Tom Herbert <tom@herbertland.com>
Cc:= NVO3 <nvo3@ietf.org>; int-area@ietf.org; Service Function Chaining IETF= list <sfc@ietf.org>; IETF IPPM WG &= lt;ippm@ietf.org>
Subject: R= E: [ippm] [Int-area] encapsulation of IOAM data in various protocols - follo= w up from WG discussion in London

 

Hi Frank,

 

How does a = forwarder know when and where to insert the data?

In the case of Geneve over IPv6, do you mean the device need to scan a= ll the protocol stack? Or just the outer encapsulation?

 

Tianran

 

From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Frank Bro= ckners (fbrockne)
Sent: Monday, April 16, 2018 3:08 PM
To: Mickey Spiegel <mspiege= l@barefootnetworks.com>; Tom Herbert <tom@herbertland.com>
Cc: NVO3 <nvo3@ietf.org>; int= -area@ietf.org; Service Function Chaining IETF list <sfc@ietf.org>; IETF IPPM WG <ippm@ietf.org>
Subject: Re: [ippm] [Int-area] encap= sulation of IOAM data in various protocols - follow up from WG discussion in= London

 

 

=

Tom,

 

a quick addition to what Mickey mentioned below: What= you seem to have in mind is what draft-ietf-ippm-ioam-data-02 refers to as = “layering” (see section 3.), i.e. if you’re running for ex= ample Geneve over IPv6, then IOAM data could be encapsulated in both protoco= ls, Geneve and IPv6 – giving you visibility into the “underlay&#= 8221; (IPv6) and the “overlay” (Geneve).

<= p class=3DMsoNormal> 

Frank

 

From: ippm <ippm= -bounces@ietf.org> On Behalf Of Mickey Spiegel
Sent:= Freitag, 13. April 2018 20:22
To: Tom Herbert <tom@herbertland.com>
Cc: NVO3 <nvo3@ietf.org>; int-area@ietf.org; Service Function Chaining IETF list <sfc@ietf.org>; IETF IPPM WG <ippm@ietf.org>
Subject: Re: [ippm] [In= t-area] encapsulation of IOAM data in various protocols - follow up from WG = discussion in London

&= nbsp;

Tom,=

 

On Thu, Apr 12, 2018 at 10:17 PM,= Tom Herbert <tom@he= rbertland.com> wrote:

Mickey,

Looking at these ippm drafts more closely, I= have a much more
fundamental concern.

In draft-brockners-ippm-ioa= m-geneve-00 for instance, there is the text
in the introduction:

&= quot;In-situ OAM (IOAM) records OAM information within the packet while
t= he packet traverses a particular network domain.  The term "in-sit= u"
refers to the fact that the IOAM data fields are added to the dat= a
packets rather than is being sent within packets specifically
dedica= ted to OAM.  This document defines how IOAM data fields are
transpor= ted as part of the Geneve [I-D.ietf-nvo3-geneve]
encapsulation."
=
I assume this means that as packets with Geneve encapsulation traversethe network they are interpreted by intermediate nodes as being
Geneve.= Since Geneve is a UDP encapsulation, then the destination UDP
port numbe= r would be used to identify packets as being Geneve. So an
intermediate d= evice might be looking for UDP packets destined to port
6081 (the assigne= d UDP port for Geneve). If my understanding is
correct, then this is a pr= oblem.

UDP port numbers do not have global meaning. An intermediate d= evice
may very well see UDP packets destined to port 6081 that are notactually Geneve. This scenario is discussed in RFC7605:

"...int= ermediate device interprets traffic based on the port number.
It is impor= tant to recognize that any interpretation of port numbers
-- except at th= e endpoints -- may be incorrect, because port numbers
are meaningful only= at the endpoints."

If the UDP data is modified, as the draft wo= uld imply, then
misinterpretation may also mean silent data corruption of= packets. A
protocol that would allow this seems pretty incorrect! Note t= hat this
would be true also for any UDP encapsulation that the network tr= ies to
interpret.

 

<= span lang=3DDE>The intention is to allow for multiple nodes that a packet trav= erses

to be= able to insert IOAM node information in the same trace option,<= /o:p>

but leave some flexibil= ity regarding which nodes actually do the

IOAM processing and the node information. Thi= s may vary

= depending on the transport.

 

<= span lang=3DDE>In case of a tunneled encapsulation such as Geneve or VXLAN,

there may sti= ll be multiple hops. For example a network may use

Geneve or VXLAN, but only do L2 proc= essing at ToRs, with L3

<= span lang=3DDE>processing done at aggregation or core switches. In this case

many packets= would do 2 Geneve or VXLAN hops, so the packet

<= div>

would contain IOAM node information fro= m two nodes.

 

An= other example is service function chaining using Geneve or=

VXLAN rather than NSH.

 


I am also w= ondering if hop-by-hop options been considered for this
application? Thei= r interpretation in the network is unabiguous and
they also have the adva= ntage that the work with any IP protocol or
encapsulation.

 =

IPv6 hop-by-hop option= s has been considered. See

draft-brockners-inband-oam-transport-05. This has not yet be= en

broken o= ut into a separate draft.

 

Mickey

 


Thanks,
Tom


On Thu, Apr 12, 2= 018 at 3:31 PM, Mickey Spiegel
<mspiegel@barefootnetworks.com> w= rote:

> Tom,
>
> On Thu, Apr 12, 2018 at 2:46 PM, Tom Herbert <= tom@herbertland.com> wrote:
&= gt;>
>> On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky <gregimirsky@gmail.com>
>> wr= ote:
>> > Hi Frank,
>> > thank you for sharing your = points. Please find my notes in-line and
>> > tagged
>>= > GIM>>. I believe that this is very much relevant to work of othe= r
>> > working
>> > groups that directly work on the= overlay encapsulations in the center of
>> > the
>> &g= t; discussion and hence I've added them to the list. Hope we'll have more>> > opinions to reach the conclusion that is acceptable to all.>> >
>> > Regards,
>> > Greg
>> = >
>> > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbr= ockne)
>> > <fbrockne@cis= co.com> wrote:
>> >>
>> >> Back at the = IPPM meeting in London, we discussed several drafts dealing
>> >= > with the encapsulation of IOAM data in various protocols
>> &g= t;> (draft-brockners-ippm-ioam-vxlan-gpe-00,
>> >> draft-b= rockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). One
>> = >> discussion topic that we decided to take to the list was the questi= on
>> >> on
>> >> whether draft-ooamdt-rtgwg-o= oam-header could be leveraged..  After
>> >> carefully>> >> considering draft-ooamdt-rtgwg-ooam-header, I came to th= e conclusion
>> >> that
>> >> the “OOAM = header” does not meet the needs of IOAM:
>> >>
>> >&g= t; * Efficiency: IOAM adds data to live user traffic. As such, an
>> >= ;> encapsulation needs to be as efficient as possible. The “OOAM he= ader”
>> >> is 8
>> >> bytes long. The approach fo= r IOAM data encapsulation in the above
>> >> mentioned
>> >= > drafts only requires 4 bytes. Using the OOAM header approach would add<= /span>
&g= t;> >> an
>> >> unnecessary overhead of 4 bytes – w= hich is significant.
>> Greg,
>>
>> I'm missing something here. = I looked at the drafts you referenced and
>> each of them looks like the= overhead for OAM is greater that four
>> bytes. In each there is some o= verhead equivalent to type/length, for
>> instance in Geneve four bytes = are needed for option class, type, and
>> length. Unless the the OA= M data is zero length, I don't see how this
>> adds up to only four= bytes of overhead.
>
>
> The four versus eight bytes just= refers to the fields in the four bytes of
> IOAM
> info, that i= s common to all IOAM options. Beyond that, there are IOAM option
> spe= cific fields. For example if doing one of the IOAM trace options, there
&= gt; are
> four bytes of trace option header, including the IOAM-trace-= type, NodeLen,
> Flags, and RemainingLen fields. These are followed by= the node data list
> containing the per hop IOAM information.
>=
> In looking at the OOAM header content, it has nothing to do with an= y of the
> IOAM information after the first four bytes. It contains an= other variant of
> the
> information in the first four bytes of = IOAM info, spread out over eight
> bytes.
>
>>
>&= gt; Tom
>>
>> >
>> > GIM>> The differ= ence in four octets is because OOAM Header:
>> >
>> >= ; provides more flexibility, e.g. Flags field and Reserved fields;
>>
> The flags field only has one defined flag at the moment, for = a timestamp
> block. For IOAM trace we need per hop timestamps, which = the timestamp
> block cannot address, i.e. the timestamp block is redu= ndant for IOAM.
>
>>
>> > supports larger OAM pac= kets than iOAM header;
>
>
> For IOAM purposes, 1020 octet= s is more than enough.
>
>>
>> > is future proof = by supporting versioning (Version field).
>
>
> IMO, takin= g the first two bits of the IOAM-Type to define a Version field
> woul= d be a good thing. This does not require adding four more bytes of
> o= verhead. 64 IOAM-Types is more than enough.
>
>>
>> = >>
>> >> * Maturity: IOAM has several implementations, = which were also shown at
>> >> recent IETF hackathons –= and we’re expecting additional implementations
>> >> t= o
>> >> be publicized soon. Interoperable implementations nee= d timely
>> >> specifications. Despite the question being ask= ed, the recent thread on
>> >> OOAM
>> >> in t= he NVO3 list hasn’t revealed any implementation of the OOAM header.>> >> In
>> >> addition, the thread revealed tha= t several fundamental questions about
>> >> the
>> &= gt;> OOAM header are still open, such as whether or how active OAM
>= ;> >> mechanisms
>> >> within protocols such as Gene= ve would apply to the OOAM header. This
>> >> ultimately mean= s that we won’t get to a timely specification.
>> >
>> >= GIM>> May I ask which encapsulations supported by the implementations=
&= gt;> > you
>> > refer to. Until very recently all iOAM proposal= s were to use meta-data>> > TLV
>> > in, e.g. Geneve and NSH.= And if these or some of these implementations
>> > already upda= ted to the newly proposed iOAM shim, I don't see problem in
>> >= making them use OOAM Header. Would you agree?
>> >
>> = >>
>> >> * Scope: It isn’t entirely clear to whic= h protocols the OOAM header
>> >> would
>> >> = ultimately apply to. The way the OOAM header is defined, OOAM uses a
>= > >> 8-bit
>> >> field for “Next Prot”, = the next protocol. Some protocols that IOAM data
>> >> needs to be= encapsulated into use 16-bits for their next protocol code
>> >= > points. See e.g. the GRE encapsulation – as specified in
>> &= gt;> draft-weis-ippm-ioam-gre-00.
>> >
>> > GIM>> The= first paragraph of the Introduction section states:
>> >   = ; New protocols that support overlay networks like VxLAN-GPE
>> >&nbs= p;   [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve
>= > >    [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-enca= psulation], and
>> >    NSH [I-D.ietf-sfc-nsh] support= multi-protocol payload, e.g.
>> >    Ethernet, IPv4/I= Pv6, and recognize Operations, Administration, and
>> >  &n= bsp; Maintenance (OAM) as one of distinct types.  That ensures that
= >> >    Overlay OAM (OOAM)packets are sharing fate with O= verlay data packet
>> >    traversing the underlay.>> > I'm updating the OOAM Header draft and along with cleaning ni= ts will
>> > update
>> > reference to GUE. I think t= hat the list and the statemnt are quite clear
>> > in
>>= ; > identifying the scope of networks that may benefit from using not onl= y
>> > common OOAM Header but common OOAM mechanisms, e.g. Echo = Request/Reply.
>> >
>> >> With the above in mind,= I’d suggest that the WG moves forward with
>> >> specific d= efinitions for encapsulating IOAM data into protocols – per
>> >= ;> the
>> >> above mentioned drafts.
>> >>
>> >= ;>
>> >>
<= /span>>> >> Regards, Frank
>> >>
>= > >>
>> >> _________________________________________= ______
>> >> ippm mailing list
>> >> ippm@ietf.org
>> >> https://www.ietf.org/m= ailman/listinfo/ippm
>> >>
>> >
>> &= gt;
>> > _______________________________________________
>= > > Int-area mailing list
>> > Int-area@ietf.org
>> > https://www.ietf.org/mailman/lis= tinfo/int-area
>> >
>>
>> ________________= _______________________________
>> ippm mailing list
>> ippm@ietf.org
>> https://www.ietf.org/mai= lman/listinfo/ippm
>
>

 

=
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Content-Type: text/html; charset="gb2312" Content-Transfer-Encoding: quoted-printable
Hi Shwetha,

You are talking about the outer encapsution. It is straight forward for the= underlay to record by the header. But what about the overlay, i.e., inner = encapsulation(e.g. geneve)? Without special configuration, intermediate nod= e will not read the inner header, hence not be able to process IOAM.
Maybe we are not synced by this overlay/underlay use case. :-)

Tianran



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=B7=A2=BC=FE=C8=CB=A3=BA Shwetha Bhandari (shwethab)
=CA=D5=BC=FE=C8=CB=A3=BA Tianran Zhou<zhoutianran@huawei.com>;Frank Brockners (fbrockn= e)<fbrockne@cisco.com>;Mick= ey Spiegel<mspiegel@bar= efootnetworks.com>;Tom Herbert<tom@herbertland.com&= gt;
=B3=AD=CB=CD=A3=BA NVO3<nvo= 3@ietf.org>;int-area<int-are= a@ietf.org>;Service Function Chaining IETF list<sfc@ietf.org>;IETF IPPM WG<ippm@ietf.org>
=D6=F7=CC=E2=A3=BA Re: [ippm] [Int-area] encapsulation of IOAM = data in various protocols - follow up from WG discussion in London
=CA=B1=BC=E4=A3=BA 2018-04-16 18:17:01

If I recall right, it is not written in the ioam data = draft.

 

> Yes, node by node configuration is an eas= y way.

= From: ippm <ippm-bounces@= ietf.org> on behalf of Tianran Zhou <zhoutianran@huawei.com>
Date: Monday, April 16, 2018 at 2:36 PM
To: "Frank Brockners (fbrockne)" <fbrockne@cisco.com>= ;, Mickey Spiegel <mspiegel@barefootnetworks.com>, Tom Herbert <to= m@herbertland.com>
Cc: NVO3 <nvo3@ietf.org>, "int-area@ietf.org" <in= t-area@ietf.org>, Service Function Chaining IETF list <sfc@ietf.org&g= t;, IETF IPPM WG <ippm@ietf.org>
Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various= protocols - follow up from WG discussion in London

 

Hi Frank,

 

If I recall right, it is not written in the io= am data draft.

Yes, node by node configuration is an easy way= . In the draft-zhou-ippm-ioam-yang, we have the =A1=B0pr= otocol-type=A1=B1 to indicate the layering.

   +--rw ioam

      +--rw ioam-= profiles

       &nbs= p; +--rw enabled?        boolean

       &nbs= p; +--rw ioam-profile* [profile-name]

       &nbs= p;    +--rw profile-name     &n= bsp;            = ;  string

       &nbs= p;    +--rw filter

       &nbs= p;    |  +--rw filter-type?   ioam-filter= -type

       &nbs= p;    |  +--rw acl-name?    &nb= sp; -> /acl:acls/acl/name

       &nbs= p;    +--rw protocol-type?     =              io= am-protocol-type

       &nbs= p;    +--rw incremental-tracing-profile {incremental-tra= ce}?

       &nbs= p;    |  ...

       &nbs= p;    +--rw preallocated-tracing-profile {preallocated-t= race}?

       &nbs= p;    |  ...

       &nbs= p;    +--rw pot-profile {proof-of-transit}?

       &nbs= p;    |  ...

       &nbs= p;    +--rw e2e-profile {edge-to-edge}?

       &nbs= p;       ...

 

 

Tianran

From:= Frank Brockners (fbrockne) [mailto:fbrockne@cisco.com]
Sent: Monday, April 16, 2018 4:51 PM
To: Tianran Zhou <zhoutianran@huawei.com>; Mickey Spiegel <= mspiegel@barefootnetworks.com>; Tom Herbert <tom@herbertland.com><= br> Cc: NVO3 <nvo3@ietf.org>; int-area@ietf.org; Service Function = Chaining IETF list <sfc@ietf.org>; IETF IPPM WG <ippm@ietf.org>=
Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various= protocols - follow up from WG discussion in London

 

Hi Tianran,

 

IOAM is a domain specific feature (see also draft-ietf-ipp= m-ioam-data-02 sections 3 and 4), which allows an operator to control by me= ans of configuration where and for which traffic IOAM data fields are added/updated/removed from the customer traff= ic. Using your example of Geneve over IPv6 =A8C with IOAM data in both the = Geneve and the IPv6 protocol, one would expect that the operator configures= the endpoints of the Geneve tunnel to operate on the IOAM data in Geneve, and the IPv6 routers that the Genev= e tunnel traverses to operate on the IOAM data in IPv6.

 

Frank

 

From:= Tianran Zhou <zhoutianran@hua= wei.com>
Sent: Montag, 16. April 2018 10:37
To: Frank Brockners (fbrockne) <fbrockne@cisco.com>; Mickey Spiegel <mspiegel@barefootnetworks.com>; Tom Herber= t <tom@herbertland.com> Cc: NVO3 <nvo3@ietf.org>;= int-area@ietf.org; Service Function Chaining IETF list <sfc@ietf.org>; IETF IPPM WG <ippm@ietf.org>
Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various= protocols - follow up from WG discussion in London

 

Hi Frank,

 

How does a forwarder know when and where to in= sert the data?

In the case of Geneve over IPv6, do you mean t= he device need to scan all the protocol stack? Or just the outer encapsulat= ion?

 

Tianran

 

From:= ippm [mailto:ippm-bounces@ietf.or= g] On Behalf Of Frank Brockners (fbrockne)
Sent: Monday, April 16, 2018 3:08 PM
To: Mickey Spiegel <mspiegel@barefootnetworks.com>; Tom Herbert <tom@herbertland.com>
Cc: NVO3 <nvo3@ietf.org>;= int-area@ietf.org; Service Function Chaining IETF list <sfc@ietf.org>; IETF IPPM WG <ippm@ietf.org>
Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various= protocols - follow up from WG discussion in London

 

 

Tom,

 

a quick addition to what Mickey mentioned below: What you = seem to have in mind is what draft-ietf-ippm-ioam-data-02 refers to as =A1= =B0layering=A1=B1 (see section 3.), i.e. if you=A1=AFre running for example Geneve over IPv6, then IOAM data could be encapsulated= in both protocols, Geneve and IPv6 =A8C giving you visibility into the =A1= =B0underlay=A1=B1 (IPv6) and the =A1=B0overlay=A1=B1 (Geneve).

 

Frank

 

From:= ippm <ippm-bounces@ietf.org> On Behalf Of Mickey Spiegel
Sent: Freitag, 13. April 2018 20:22
To: Tom Herbert <tom@herbe= rtland.com>
Cc: NVO3 <nvo3@ietf.org>;= int-area@ietf.org; Service Function Chaining IETF list <sfc@ietf.org>; IETF IPPM WG <ippm@ietf.org>
Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various= protocols - follow up from WG discussion in London

 

Tom,

 

On Thu, Apr 12, 2018 at 10:17 PM, = Tom Herbert <to= m@herbertland.com> wrote:

Mickey,

Looking at these ippm drafts more closely, I have a much more
fundamental concern.

In draft-brockners-ippm-ioam-geneve-00 for instance, there is the text
in the introduction:

"In-situ OAM (IOAM) records OAM information within the packet while the packet traverses a particular network domain.  The term "in-s= itu"
refers to the fact that the IOAM data fields are added to the data
packets rather than is being sent within packets specifically
dedicated to OAM.  This document defines how IOAM data fields are
transported as part of the Geneve [I-D.ietf-nvo3-geneve]
encapsulation."

I assume this means that as packets with Geneve encapsulation traverse
the network they are interpreted by intermediate nodes as being
Geneve. Since Geneve is a UDP encapsulation, then the destination UDP
port number would be used to identify packets as being Geneve. So an
intermediate device might be looking for UDP packets destined to port
6081 (the assigned UDP port for Geneve). If my understanding is
correct, then this is a problem.

UDP port numbers do not have global meaning. An intermediate device
may very well see UDP packets destined to port 6081 that are not
actually Geneve. This scenario is discussed in RFC7605:

"...intermediate device interprets traffic based on the port number. It is important to recognize that any interpretation of port numbers
-- except at the endpoints -- may be incorrect, because port numbers
are meaningful only at the endpoints."

If the UDP data is modified, as the draft would imply, then
misinterpretation may also mean silent data corruption of packets. A
protocol that would allow this seems pretty incorrect! Note that this
would be true also for any UDP encapsulation that the network tries to
interpret.

 

The intention is to allow for mult= iple nodes that a packet traverses

to be able to insert IOAM node inf= ormation in the same trace option,

but leave some flexibility regardi= ng which nodes actually do the

IOAM processing and the node infor= mation. This may vary

depending on the transport.=

 

In case of a tunneled encapsulatio= n such as Geneve or VXLAN,

there may still be multiple hops. = For example a network may use

Geneve or VXLAN, but only do L2 pr= ocessing at ToRs, with L3

processing done at aggregation or = core switches. In this case

many packets would do 2 Geneve or = VXLAN hops, so the packet

would contain IOAM node informatio= n from two nodes.

 

Another example is service functio= n chaining using Geneve or

VXLAN rather than NSH.

 


I am also wondering if hop-by-hop options been considered for this
application? Their interpretation in the network is unabiguous and
they also have the advantage that the work with any IP protocol or
encapsulation.

 

IPv6 hop-by-hop options has been c= onsidered. See

draft-brockners-inband-oam-transpo= rt-05. This has not yet been

broken out into a separate draft.<= /span>

 

Mickey

 


Thanks,
Tom


On Thu, Apr 12, 2018 at 3:31 PM, Mickey Spiegel
<mspiegel@barefootnetworks.com> wrote:

> Tom,
>
> On Thu, Apr 12, 2018 at 2:46 PM, Tom Herbert <tom@herbertland.com> wrote:
>>
>> On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky <gregimirsky@gmail.com>
>> wrote:
>> > Hi Frank,
>> > thank you for sharing your points. Please find my notes in-li= ne and
>> > tagged
>> > GIM>>. I believe that this is very much relevant to wor= k of other
>> > working
>> > groups that directly work on the overlay encapsulations in th= e center of
>> > the
>> > discussion and hence I've added them to the list. Hope we'll = have more
>> > opinions to reach the conclusion that is acceptable to all. >> >
>> > Regards,
>> > Greg
>> >
>> > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne)<= br> >> > <fbrockne@cisco.com<= /a>> wrote:
>> >>
>> >> Back at the IPPM meeting in London, we discussed several = drafts dealing
>> >> with the encapsulation of IOAM data in various protocols<= br> >> >> (draft-brockners-ippm-ioam-vxlan-gpe-00,
>> >> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam= -gre-00). One
>> >> discussion topic that we decided to take to the list was = the question
>> >> on
>> >> whether draft-ooamdt-rtgwg-ooam-header could be leveraged= ..  After
>> >> carefully
>> >> considering draft-ooamdt-rtgwg-ooam-header, I came to the= conclusion
>> >> that
>> >> the =A1=B0OOAM header=A1=B1 does not meet the needs of IO= AM:
>> >>
>> >> * Efficiency: IOAM adds data to = live user traffic. As such, an
>> >> encapsulation needs to be as eff= icient as possible. The =A1=B0OOAM header=A1=B1
>> >> is 8
>> >> bytes long. The approach for IOA= M data encapsulation in the above
>> >> mentioned
>> >> drafts only requires 4 bytes. Us= ing the OOAM header approach would add
>> >> an
>> >> unnecessary overhead of 4 bytes = =A8C which is significant.
>> Greg,
>>
>> I'm missing something here. I looked at t= he drafts you referenced and
>> each of them looks like the overhead for = OAM is greater that four
>> bytes. In each there is some overhead equ= ivalent to type/length, for
>> instance in Geneve four bytes are needed = for option class, type, and
>> length. Unless the the OAM data is zero length, I don't see how th= is
>> adds up to only four bytes of overhead.
>
>
> The four versus eight bytes just refers to the fields in the four byte= s of
> IOAM
> info, that is common to all IOAM options. Beyond that, there are IOAM = option
> specific fields. For example if doing one of the IOAM trace options, t= here
> are
> four bytes of trace option header, including the IOAM-trace-type, Node= Len,
> Flags, and RemainingLen fields. These are followed by the node data li= st
> containing the per hop IOAM information.
>
> In looking at the OOAM header content, it has nothing to do with any o= f the
> IOAM information after the first four bytes. It contains another varia= nt of
> the
> information in the first four bytes of IOAM info, spread out over eigh= t
> bytes.
>
>>
>> Tom
>>
>> >
>> > GIM>> The difference in four octets is because OOAM Hea= der:
>> >
>> > provides more flexibility, e.g. Flags field and Reserved fiel= ds;
>
>
> The flags field only has one defined flag at the moment, for a timesta= mp
> block. For IOAM trace we need per hop timestamps, which the timestamp<= br> > block cannot address, i.e. the timestamp block is redundant for IOAM.<= br> >
>>
>> > supports larger OAM packets than iOAM header;
>
>
> For IOAM purposes, 1020 octets is more than enough.
>
>>
>> > is future proof by supporting versioning (Version field).
>
>
> IMO, taking the first two bits of the IOAM-Type to define a Version fi= eld
> would be a good thing. This does not require adding four more bytes of=
> overhead. 64 IOAM-Types is more than enough.
>
>>
>> >>
>> >> * Maturity: IOAM has several implementations, which were = also shown at
>> >> recent IETF hackathons =A8C and we=A1=AFre expecting addi= tional implementations
>> >> to
>> >> be publicized soon. Interoperable implementations need ti= mely
>> >> specifications. Despite the question being asked, the rec= ent thread on
>> >> OOAM
>> >> in the NVO3 list hasn=A1=AFt revealed any implementation = of the OOAM header.
>> >> In
>> >> addition, the thread revealed that several fundamental qu= estions about
>> >> the
>> >> OOAM header are still open, such as whether or how active= OAM
>> >> mechanisms
>> >> within protocols such as Geneve would apply to the OOAM h= eader. This
>> >> ultimately means that we won=A1=AFt get to a timely speci= fication.
>> >
>> > GIM>> May I ask which encapsul= ations supported by the implementations
>> > you
>> > refer to. Until very recently all iO= AM proposals were to use meta-data
>> > TLV
>> > in, e.g. Geneve and NSH. And if thes= e or some of these implementations
>> > already updated to the newly proposed iOAM shim, I don't see = problem in
>> > making them use OOAM Header. Would you agree?
>> >
>> >>
>> >> * Scope: It isn=A1=AFt entirely clear to which protocols = the OOAM header
>> >> would
>> >> ultimately apply to. The way the OOAM header is defined, = OOAM uses a
>> >> 8-bit
>> >> field for =A1=B0Next Prot=A1=B1, the next protocol. Some = protocols that IOAM data
>> >> needs to be encapsulated into us= e 16-bits for their next protocol code
>> >> points. See e.g. the GRE encapsulation =A8C as specified = in
>> >> draft-weis-ippm-ioam-gre-00.
>> >
>> > GIM>> The first paragraph of t= he Introduction section states:
>> >    New protocols that supp= ort overlay networks like VxLAN-GPE
>> >    [I-D.ietf-nvo3-vxlan-gp= e], GUE [I-D.ietf-nvo3-gue], Geneve
>> >    [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls= -encapsulation], and
>> >    NSH [I-D.ietf-sfc-nsh] support multi-protocol pa= yload, e.g.
>> >    Ethernet, IPv4/IPv6, and recognize Operations, A= dministration, and
>> >    Maintenance (OAM) as one of distinct types. = ; That ensures that
>> >    Overlay OAM (OOAM)packets are sharing fate with = Overlay data packet
>> >    traversing the underlay.
>> > I'm updating the OOAM Header draft and along with cleaning ni= ts will
>> > update
>> > reference to GUE. I think that the list and the statemnt are = quite clear
>> > in
>> > identifying the scope of networks that may benefit from using= not only
>> > common OOAM Header but common OOAM mechanisms, e.g. Echo Requ= est/Reply.
>> >
>> >> With the above in mind, I=A1=AFd suggest that the WG move= s forward with
>> >> specific definitions for encapsu= lating IOAM data into protocols =A8C per
>> >> the
>> >> above mentioned drafts.
>> >>
>> >>
>> >>
>> >> Regards, Frank
>> >>
>> >>
>> >> _______________________________________________
>> >> ippm mailing list
>> >> ippm@ietf.org
>> >> https://www.ietf.org/mailman/listinfo/ippm
>> >>
>> >
>> >
>> > _______________________________________________
>> > Int-area mailing list
>> > Int-area@ietf.org >> > https://www.ietf.org/mailman/listinfo/int-area
>> >
>>
>> _______________________________________________
>> ippm mailing list
>> ippm@ietf.org
>> https://www.ietf.org/mailman/listinfo/ippm
>
>

 

--_000_BBA82579FD347748BEADC4C445EA0F21A6D63236NKGEML515MBXchi_-- From nobody Mon Apr 16 07:40:38 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4969712DB6E for ; Mon, 16 Apr 2018 07:40:29 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.91 X-Spam-Level: X-Spam-Status: No, score=-1.91 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_DKIMWL_WL_MED=-0.01] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=herbertland-com.20150623.gappssmtp.com 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 XKDN2KVNmr4c for ; Mon, 16 Apr 2018 07:40:26 -0700 (PDT) Received: from mail-qt0-x22f.google.com (mail-qt0-x22f.google.com [IPv6:2607:f8b0:400d:c0d::22f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A774212DA22 for ; Mon, 16 Apr 2018 07:40:22 -0700 (PDT) Received: by mail-qt0-x22f.google.com with SMTP id h4so15505466qtn.13 for ; Mon, 16 Apr 2018 07:40:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=herbertland-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=XHqFEgZ8mndCnGQWNcA7XvNaMH1JsbTvlVyeE50OLeo=; b=Q0PHui0QiL64eTaIy5IECs4iN3mTWgU/KycstTaVnpnYWoH2tO6nkmZkDJwRL4J8X9 L5ZIT+R4zF1Xa1vckRFjd2Sf8UOuchJrOpeJ1m66K/6UwqACxy7q+Cuic1nhbKKLvwlY zhJZJXHHF3Q5kv/I+rTSf2T2Trclg6zbhGu7j4nityQgwFBd+2Tuw8npHL1DQhLRQPEt eOtCy5N34kNGAdZJbfSjr1MSYJLx4uHzICQbsLoS2VUAX9TD2Yua0bkTDVdcwhI14NEe rOiRmSEPBvByRuMF9AmjOb1GSIh2rW3GKj8vveMJGUqUKlchTilxKrbON5b+vEjSox4g iafw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=XHqFEgZ8mndCnGQWNcA7XvNaMH1JsbTvlVyeE50OLeo=; b=C0VkKwD/ayZDoGbmyr11ujdNyFNLJRAqordVrGwSfggEhETkCxWOJL933ODRcWlBS/ 3HDvx8PLfRcdU8+FUqggTVysOO5TvKPP3l7M7jfQm736rRYmlz7J0lvOmuzAJFDVfxW+ qdd5yZfZBq5CWHdvggKXwPzUqYNdgpAPIUxSmWOhqICqDxaYqqqu+5n8h6BVJuctd4iN xs/nApOZ/qzBciWQWumebXM5zI8DKAclvn5j0LInP+EcrzXyiyCvObCYqh1ho0mIswM0 +GhPbkJrF7twyesTtJaL7SU0CLKx8a6fRlwr7HouXwH9Lv4TNnyhulO0Hv4Eba+SfTSZ hfVA== X-Gm-Message-State: ALQs6tCQxv+AcBlgeLfED9yUgI9M+7NMqdiJBJHBae5UCI2ry88haWdd PJPDw0oym3dfYUtbBj2ois0spukUKiS9rNYuxZ8guw== X-Google-Smtp-Source: AIpwx4+vqE6xT2S7DcsQat3/8p0C0bpmrQzKdEVAR+qXf2Vw1B84J9kz7aCd/BOQqbX0XT2LUwPrJdmUPg36YQ+9gMQ= X-Received: by 10.237.35.139 with SMTP id j11mr16936478qtc.291.1523889621311; Mon, 16 Apr 2018 07:40:21 -0700 (PDT) MIME-Version: 1.0 Received: by 10.237.48.35 with HTTP; Mon, 16 Apr 2018 07:40:20 -0700 (PDT) In-Reply-To: References: <8d1b3bb4a1794c4fac3455257e0ab60e@XCH-RCD-008.cisco.com> From: Tom Herbert Date: Mon, 16 Apr 2018 07:40:20 -0700 Message-ID: To: Tianran Zhou Cc: "Shwetha Bhandari (shwethab)" , "Frank Brockners (fbrockne)" , Mickey Spiegel , NVO3 , int-area , Service Function Chaining IETF list , IETF IPPM WG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Apr 2018 14:40:32 -0000 On Mon, Apr 16, 2018 at 6:31 AM, Tianran Zhou wrot= e: > Hi Shwetha, > > You are talking about the outer encapsution. It is straight forward for t= he > underlay to record by the header. But what about the overlay, i.e., inner > encapsulation(e.g. geneve)? Without special configuration, intermediate n= ode > will not read the inner header, hence not be able to process IOAM.e Hi Tianran, I believe that is also not protocol conformant. Intermediate nodes should not be processing transport layer data as this can lead to misinterpretation and possibly silent data corruption. For instance, Geneve is a UDP encapsulation protocol with assigned port 6081. In order for an intermediate device to process the Geneve encapsulation header it would need to look for packets with destination port of 6081 since that is the only possible discriminator. However, transport port numbers do not have global meaning and hosts may use port numbers for other purposes (RFC7605 describes this). So a packet to port 6081 might be something other than Geneve and may be misinterpreted. If a misinterpreted packet is changed (like ippm data is written) then that would be systematic silent data corruption. As far as I know, hop-by-hop options is the only protocol confirming mechanism that allows an intermediate note to change data of packet in flight. Encpasulation is the only conforming mechanism that allows an intermediate node to add data (like extension headers) to a packet in flight. Tom > Maybe we are not synced by this overlay/underlay use case. :-) > > Tianran > > > > ________________________________ > Sent from WeLink > > =E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A Shwetha Bhandari (shwethab) > =E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A Tianran Zhou= ;Frank Brockners > (fbrockne);Mickey > Spiegel;Tom Herbert > =E6=8A=84=E9=80=81=EF=BC=9A NVO3;int-area;Service Function > Chaining IETF list;IETF IPPM WG > =E4=B8=BB=E9=A2=98=EF=BC=9A Re: [ippm] [Int-area] encapsulation of IOAM d= ata in various protocols - > follow up from WG discussion in London > =E6=97=B6=E9=97=B4=EF=BC=9A 2018-04-16 18:17:01 > > Hi Tianran, > >> If I recall right, it is not written in the ioam data draft. > > Data draft is defining the data to be carried in IOAM in an encapsulation > agnostic way, it does not specify how the encapsulation protocol is > configured. > > > >> Yes, node by node configuration is an easy way. > > While it is, it does not have to be a node by node configuration. It can = be > part of the encapsulation definition. > > For e.g. If the encapsulation is IPv6 and if we define the data to be > carried as HbH options, then based on the Option Type with highest order = 2 > bits set to 00 then the v6 nodes that implement IOAM will process the opt= ion > and others will skip over. > > > > > > Thanks, > > Shwetha > > > > From: ippm on behalf of Tianran Zhou > > Date: Monday, April 16, 2018 at 2:36 PM > To: "Frank Brockners (fbrockne)" , Mickey Spiegel > , Tom Herbert > Cc: NVO3 , "int-area@ietf.org" , Servic= e > Function Chaining IETF list , IETF IPPM WG > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various > protocols - follow up from WG discussion in London > > > > Hi Frank, > > > > If I recall right, it is not written in the ioam data draft. > > Yes, node by node configuration is an easy way. In the > draft-zhou-ippm-ioam-yang, we have the =E2=80=9Cprotocol-type=E2=80=9D to= indicate the > layering. > > +--rw ioam > > +--rw ioam-profiles > > +--rw enabled? boolean > > +--rw ioam-profile* [profile-name] > > +--rw profile-name string > > +--rw filter > > | +--rw filter-type? ioam-filter-type > > | +--rw acl-name? -> /acl:acls/acl/name > > +--rw protocol-type? ioam-protocol-type > > +--rw incremental-tracing-profile {incremental-trace}? > > | ... > > +--rw preallocated-tracing-profile {preallocated-trace}? > > | ... > > +--rw pot-profile {proof-of-transit}? > > | ... > > +--rw e2e-profile {edge-to-edge}? > > ... > > > > > > Tianran > > From: Frank Brockners (fbrockne) [mailto:fbrockne@cisco.com] > Sent: Monday, April 16, 2018 4:51 PM > To: Tianran Zhou ; Mickey Spiegel > ; Tom Herbert > Cc: NVO3 ; int-area@ietf.org; Service Function Chaining IE= TF > list ; IETF IPPM WG > Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various > protocols - follow up from WG discussion in London > > > > Hi Tianran, > > > > IOAM is a domain specific feature (see also draft-ietf-ippm-ioam-data-02 > sections 3 and 4), which allows an operator to control by means of > configuration where and for which traffic IOAM data fields are > added/updated/removed from the customer traffic. Using your example of > Geneve over IPv6 =E2=80=93 with IOAM data in both the Geneve and the IPv6= protocol, > one would expect that the operator configures the endpoints of the Geneve > tunnel to operate on the IOAM data in Geneve, and the IPv6 routers that t= he > Geneve tunnel traverses to operate on the IOAM data in IPv6. > > > > Frank > > > > From: Tianran Zhou > Sent: Montag, 16. April 2018 10:37 > To: Frank Brockners (fbrockne) ; Mickey Spiegel > ; Tom Herbert > Cc: NVO3 ; int-area@ietf.org; Service Function Chaining IE= TF > list ; IETF IPPM WG > Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various > protocols - follow up from WG discussion in London > > > > Hi Frank, > > > > How does a forwarder know when and where to insert the data? > > In the case of Geneve over IPv6, do you mean the device need to scan all = the > protocol stack? Or just the outer encapsulation? > > > > Tianran > > > > From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Frank Brockners > (fbrockne) > Sent: Monday, April 16, 2018 3:08 PM > To: Mickey Spiegel ; Tom Herbert > > Cc: NVO3 ; int-area@ietf.org; Service Function Chaining IE= TF > list ; IETF IPPM WG > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various > protocols - follow up from WG discussion in London > > > > > > Tom, > > > > a quick addition to what Mickey mentioned below: What you seem to have in > mind is what draft-ietf-ippm-ioam-data-02 refers to as =E2=80=9Clayering= =E2=80=9D (see > section 3.), i.e. if you=E2=80=99re running for example Geneve over IPv6,= then IOAM > data could be encapsulated in both protocols, Geneve and IPv6 =E2=80=93 g= iving you > visibility into the =E2=80=9Cunderlay=E2=80=9D (IPv6) and the =E2=80=9Cov= erlay=E2=80=9D (Geneve). > > > > Frank > > > > From: ippm On Behalf Of Mickey Spiegel > Sent: Freitag, 13. April 2018 20:22 > To: Tom Herbert > Cc: NVO3 ; int-area@ietf.org; Service Function Chaining IE= TF > list ; IETF IPPM WG > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various > protocols - follow up from WG discussion in London > > > > Tom, > > > > On Thu, Apr 12, 2018 at 10:17 PM, Tom Herbert wrote= : > > Mickey, > > Looking at these ippm drafts more closely, I have a much more > fundamental concern. > > In draft-brockners-ippm-ioam-geneve-00 for instance, there is the text > in the introduction: > > "In-situ OAM (IOAM) records OAM information within the packet while > the packet traverses a particular network domain. The term "in-situ" > refers to the fact that the IOAM data fields are added to the data > packets rather than is being sent within packets specifically > dedicated to OAM. This document defines how IOAM data fields are > transported as part of the Geneve [I-D.ietf-nvo3-geneve] > encapsulation." > > I assume this means that as packets with Geneve encapsulation traverse > the network they are interpreted by intermediate nodes as being > Geneve. Since Geneve is a UDP encapsulation, then the destination UDP > port number would be used to identify packets as being Geneve. So an > intermediate device might be looking for UDP packets destined to port > 6081 (the assigned UDP port for Geneve). If my understanding is > correct, then this is a problem. > > UDP port numbers do not have global meaning. An intermediate device > may very well see UDP packets destined to port 6081 that are not > actually Geneve. This scenario is discussed in RFC7605: > > "...intermediate device interprets traffic based on the port number. > It is important to recognize that any interpretation of port numbers > -- except at the endpoints -- may be incorrect, because port numbers > are meaningful only at the endpoints." > > If the UDP data is modified, as the draft would imply, then > misinterpretation may also mean silent data corruption of packets. A > protocol that would allow this seems pretty incorrect! Note that this > would be true also for any UDP encapsulation that the network tries to > interpret. > > > > The intention is to allow for multiple nodes that a packet traverses > > to be able to insert IOAM node information in the same trace option, > > but leave some flexibility regarding which nodes actually do the > > IOAM processing and the node information. This may vary > > depending on the transport. > > > > In case of a tunneled encapsulation such as Geneve or VXLAN, > > there may still be multiple hops. For example a network may use > > Geneve or VXLAN, but only do L2 processing at ToRs, with L3 > > processing done at aggregation or core switches. In this case > > many packets would do 2 Geneve or VXLAN hops, so the packet > > would contain IOAM node information from two nodes. > > > > Another example is service function chaining using Geneve or > > VXLAN rather than NSH. > > > > > I am also wondering if hop-by-hop options been considered for this > application? Their interpretation in the network is unabiguous and > they also have the advantage that the work with any IP protocol or > encapsulation. > > > > IPv6 hop-by-hop options has been considered. See > > draft-brockners-inband-oam-transport-05. This has not yet been > > broken out into a separate draft. > > > > Mickey > > > > > Thanks, > Tom > > > On Thu, Apr 12, 2018 at 3:31 PM, Mickey Spiegel > wrote: > >> Tom, >> >> On Thu, Apr 12, 2018 at 2:46 PM, Tom Herbert wrote= : >>> >>> On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky >>> wrote: >>> > Hi Frank, >>> > thank you for sharing your points. Please find my notes in-line and >>> > tagged >>> > GIM>>. I believe that this is very much relevant to work of other >>> > working >>> > groups that directly work on the overlay encapsulations in the center >>> > of >>> > the >>> > discussion and hence I've added them to the list. Hope we'll have mor= e >>> > opinions to reach the conclusion that is acceptable to all. >>> > >>> > Regards, >>> > Greg >>> > >>> > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) >>> > wrote: >>> >> >>> >> Back at the IPPM meeting in London, we discussed several drafts >>> >> dealing >>> >> with the encapsulation of IOAM data in various protocols >>> >> (draft-brockners-ippm-ioam-vxlan-gpe-00, >>> >> draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). O= ne >>> >> discussion topic that we decided to take to the list was the questio= n >>> >> on >>> >> whether draft-ooamdt-rtgwg-ooam-header could be leveraged.. After >>> >> carefully >>> >> considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusion >>> >> that >>> >> the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM: >>> >> >>> >> * Efficiency: IOAM adds data to live user traffic. As such, an >>> >> encapsulation needs to be as efficient as possible. The =E2=80=9COOA= M header=E2=80=9D >>> >> is 8 >>> >> bytes long. The approach for IOAM data encapsulation in the above >>> >> mentioned >>> >> drafts only requires 4 bytes. Using the OOAM header approach would a= dd >>> >> an >>> >> unnecessary overhead of 4 bytes =E2=80=93 which is significant. >>> Greg, >>> >>> I'm missing something here. I looked at the drafts you referenced and >>> each of them looks like the overhead for OAM is greater that four >>> bytes. In each there is some overhead equivalent to type/length, for >>> instance in Geneve four bytes are needed for option class, type, and >>> length. Unless the the OAM data is zero length, I don't see how this >>> adds up to only four bytes of overhead. >> >> >> The four versus eight bytes just refers to the fields in the four bytes = of >> IOAM >> info, that is common to all IOAM options. Beyond that, there are IOAM >> option >> specific fields. For example if doing one of the IOAM trace options, the= re >> are >> four bytes of trace option header, including the IOAM-trace-type, NodeLe= n, >> Flags, and RemainingLen fields. These are followed by the node data list >> containing the per hop IOAM information. >> >> In looking at the OOAM header content, it has nothing to do with any of >> the >> IOAM information after the first four bytes. It contains another variant >> of >> the >> information in the first four bytes of IOAM info, spread out over eight >> bytes. >> >>> >>> Tom >>> >>> > >>> > GIM>> The difference in four octets is because OOAM Header: >>> > >>> > provides more flexibility, e.g. Flags field and Reserved fields; >> >> >> The flags field only has one defined flag at the moment, for a timestamp >> block. For IOAM trace we need per hop timestamps, which the timestamp >> block cannot address, i.e. the timestamp block is redundant for IOAM. >> >>> >>> > supports larger OAM packets than iOAM header; >> >> >> For IOAM purposes, 1020 octets is more than enough. >> >>> >>> > is future proof by supporting versioning (Version field). >> >> >> IMO, taking the first two bits of the IOAM-Type to define a Version fiel= d >> would be a good thing. This does not require adding four more bytes of >> overhead. 64 IOAM-Types is more than enough. >> >>> >>> >> >>> >> * Maturity: IOAM has several implementations, which were also shown = at >>> >> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting additio= nal >>> >> implementations >>> >> to >>> >> be publicized soon. Interoperable implementations need timely >>> >> specifications. Despite the question being asked, the recent thread = on >>> >> OOAM >>> >> in the NVO3 list hasn=E2=80=99t revealed any implementation of the O= OAM >>> >> header. >>> >> In >>> >> addition, the thread revealed that several fundamental questions abo= ut >>> >> the >>> >> OOAM header are still open, such as whether or how active OAM >>> >> mechanisms >>> >> within protocols such as Geneve would apply to the OOAM header. This >>> >> ultimately means that we won=E2=80=99t get to a timely specification= . >>> > >>> > GIM>> May I ask which encapsulations supported by the implementations >>> > you >>> > refer to. Until very recently all iOAM proposals were to use meta-dat= a >>> > TLV >>> > in, e.g. Geneve and NSH. And if these or some of these implementation= s >>> > already updated to the newly proposed iOAM shim, I don't see problem = in >>> > making them use OOAM Header. Would you agree? >>> > >>> >> >>> >> * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM= header >>> >> would >>> >> ultimately apply to. The way the OOAM header is defined, OOAM uses a >>> >> 8-bit >>> >> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some proto= cols that IOAM >>> >> data >>> >> needs to be encapsulated into use 16-bits for their next protocol co= de >>> >> points. See e.g. the GRE encapsulation =E2=80=93 as specified in >>> >> draft-weis-ippm-ioam-gre-00. >>> > >>> > GIM>> The first paragraph of the Introduction section states: >>> > New protocols that support overlay networks like VxLAN-GPE >>> > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve >>> > [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], a= nd >>> > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. >>> > Ethernet, IPv4/IPv6, and recognize Operations, Administration, and >>> > Maintenance (OAM) as one of distinct types. That ensures that >>> > Overlay OAM (OOAM)packets are sharing fate with Overlay data packe= t >>> > traversing the underlay. >>> > I'm updating the OOAM Header draft and along with cleaning nits will >>> > update >>> > reference to GUE. I think that the list and the statemnt are quite >>> > clear >>> > in >>> > identifying the scope of networks that may benefit from using not onl= y >>> > common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Repl= y. >>> > >>> >> With the above in mind, I=E2=80=99d suggest that the WG moves forwar= d with >>> >> specific definitions for encapsulating IOAM data into protocols =E2= =80=93 per >>> >> the >>> >> above mentioned drafts. >>> >> >>> >> >>> >> >>> >> Regards, Frank >>> >> >>> >> >>> >> _______________________________________________ >>> >> ippm mailing list >>> >> ippm@ietf.org >>> >> https://www.ietf.org/mailman/listinfo/ippm >>> >> >>> > >>> > >>> > _______________________________________________ >>> > Int-area mailing list >>> > Int-area@ietf.org >>> > https://www.ietf.org/mailman/listinfo/int-area >>> > >>> >>> _______________________________________________ >>> ippm mailing list >>> ippm@ietf.org >>> https://www.ietf.org/mailman/listinfo/ippm >> >> > > From nobody Mon Apr 16 18:18:24 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AFCE112E8A8; Mon, 16 Apr 2018 18:18:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.2 X-Spam-Level: X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, URIBL_BLOCKED=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 j-e554AIbG8C; Mon, 16 Apr 2018 18:18:10 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [194.213.3.17]) (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 A37C712D7F2; Mon, 16 Apr 2018 18:18:09 -0700 (PDT) Received: from lhreml704-cah.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id F001D307866C0; Tue, 17 Apr 2018 02:18:05 +0100 (IST) Received: from NKGEML414-HUB.china.huawei.com (10.98.56.75) by lhreml704-cah.china.huawei.com (10.201.108.45) with Microsoft SMTP Server (TLS) id 14.3.382.0; Tue, 17 Apr 2018 02:18:07 +0100 Received: from NKGEML515-MBX.china.huawei.com ([fe80::a54a:89d2:c471:ff]) by nkgeml414-hub.china.huawei.com ([10.98.56.75]) with mapi id 14.03.0361.001; Tue, 17 Apr 2018 09:18:00 +0800 From: Tianran Zhou To: Tom Herbert CC: "Shwetha Bhandari (shwethab)" , "Frank Brockners (fbrockne)" , Mickey Spiegel , NVO3 , "Service Function Chaining IETF list" , IETF IPPM WG Thread-Topic: [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AQHT0qfYMJmDjLfNRU+b5k8Wa55hLqP9MIyAgABxbYCAANtOAIAD+q4AgACbFcD//4GggIAAiFIg//+PoQCAALymQf//jQEAACbtLsA= Date: Tue, 17 Apr 2018 01:17:59 +0000 Message-ID: References: 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ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Apr 2018 07:51:58 +0000 Received: from XCH-RCD-010.cisco.com (xch-rcd-010.cisco.com [173.37.102.20]) by rcdn-core-7.cisco.com (8.14.5/8.14.5) with ESMTP id w3H7pwWK022132 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Tue, 17 Apr 2018 07:51:58 GMT Received: from xch-rcd-008.cisco.com (173.37.102.18) by XCH-RCD-010.cisco.com (173.37.102.20) with Microsoft SMTP Server (TLS) id 15.0.1320.4; Tue, 17 Apr 2018 02:51:57 -0500 Received: from xch-rcd-008.cisco.com ([173.37.102.18]) by XCH-RCD-008.cisco.com ([173.37.102.18]) with mapi id 15.00.1320.000; Tue, 17 Apr 2018 02:51:57 -0500 From: "Frank Brockners (fbrockne)" To: Tianran Zhou , Tom Herbert CC: "Shwetha Bhandari (shwethab)" , Mickey Spiegel , NVO3 , "Service Function Chaining IETF list" , IETF IPPM WG Thread-Topic: [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AQHT01Rv7uw9TGdqO0+V2HJ61OA6MaQC+nQwgABu/4D//63XQIAAWkqAgAATngCAADaJgIAAEx0AgACyKYCAABh5EA== Date: Tue, 17 Apr 2018 07:51:57 +0000 Message-ID: References: <8d1b3bb4a1794c4fac3455257e0ab60e@XCH-RCD-008.cisco.com> In-Reply-To: Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.61.192.93] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Apr 2018 07:52:06 -0000 DQpIaSBUaWFucmFuLA0KDQpUb20ncyBub3RlIGFscmVhZHkgaW5jbHVkZXMgdGhlIGhpbnQ6IFlv 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header.d=gmail.com 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 thCQL3phvwb0; Tue, 17 Apr 2018 04:49:32 -0700 (PDT) Received: from mail-oi0-x229.google.com (mail-oi0-x229.google.com [IPv6:2607:f8b0:4003:c06::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D322512EAD6; Tue, 17 Apr 2018 04:49:31 -0700 (PDT) Received: by mail-oi0-x229.google.com with SMTP id p62-v6so1295625oie.10; Tue, 17 Apr 2018 04:49:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=ihfYckc6HrMBw/Fk8RPDFdssMPg0MSk/2xInJG2IJy8=; b=etZpfx4oYR3G42G3RQoX1DzjS04c6WPZUjNDpAS0pw8VXtbWGa1JSc1lpij4SowPus k3P23HX+7CqhS3OkOSyouF/ob7ZlOL+Sl+GuxgiNEqGlbNdr+KzkBHcyJJF/olh8nPS+ 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AIpwx4/IHbAEwZXuP7+3zP/4wVLYdKDvxY69QrPioa8eExZWwsf6z8bI2wp+HehVLmJgiWoJ1h5I6h3vRzSoGcXW8S0= X-Received: by 2002:aca:5a44:: with SMTP id o65-v6mr1015994oib.38.1523965771224; Tue, 17 Apr 2018 04:49:31 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a9d:1f3a:0:0:0:0:0 with HTTP; Tue, 17 Apr 2018 04:49:10 -0700 (PDT) In-Reply-To: References: <2ac6b61d-3a38-1aaf-62ae-d923f1ad7468@pi.nu> <052998BB-B820-412C-8363-B3EB7551B299@nokia.com> <1522554645079.8864@bell.ca> <1522812352107.5966@bell.ca> <489a9667-f159-4607-5834-b4bacf64989c@gmail.com> <09337fcf-64c9-450c-8dbc-ba8330611fe4.xiaohu.xxh@alibaba-inc.com> <6EE25554-3714-4A75-896F-24CC89BAA807@gmail.com> <5dab5411-0b08-4bd4-86ec-752e1803c3ff.xiaohu.xxh@alibaba-inc.com> <6bea41f6-5519-f512-92e5-a72bbd6187da@gmail.com> From: "Andrew G. Malis" Date: Tue, 17 Apr 2018 07:49:10 -0400 Message-ID: To: "Zafar Ali (zali)" Cc: "mpls@ietf.org" , SPRING WG List , "sfc@ietf.org" , mpls Content-Type: multipart/alternative; boundary="000000000000719a1a056a09ee49" Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Apr 2018 11:49:34 -0000 --000000000000719a1a056a09ee49 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable To be completely clear, the two drafts I was referring to in my email below are draft-xuclad-spring-sr-service-chaining-01 and draft-ietf-mpls-sfc-00. Cheers, Andy On Sun, Apr 15, 2018 at 10:55 AM, Andrew G. Malis wrote= : > Zafar, et al, > > Perhaps the fairest to all concerned is for the MPLS WG to adopt both > drafts, and then it will be up to the WG (rather than the authors) to bes= t > determine the technical details going forward, and how best to document > them. That way the work becomes the consensus product of the WG. > > Cheers, > Andy > > > On Sun, Apr 15, 2018 at 12:44 AM, Zafar Ali (zali) wrote= : > >> Dear Stewart, WG Chairs and the WG, >> >> >> >> I do not agree with Stewart=E2=80=99s points and will response in a sepa= rate >> email. But all that is just noise and that cannot resolve the issue at >> hand. >> >> >> >> A countless time, Xiaohu has raised the issue that the intellectual >> property for the contents in section 6 of draft-farrel-mpls-sfc belongs = to >> draft-xu-mpls-service-chaining. Please see one of Xiaohu's recent emails >> with the subject *"[spring] For the fairness and justice of the IETF >> culture"* dated Thursday, April 5, 2018 at 12:34 AM, copied in the >> following. >> >> >> >> This issue was also raised by many during the WG adoption poll of the >> document. The chairs adopted the work with the promise of fixing the iss= ue. >> Specifically, in the email to announce the adoption of the ID to the WG, >> the chair(s) mentioned the following: >> >> >> >> "That decision is taken, the issues that has been pointed out are >> >> noted. These issues need to be resolved on the mailing list and >> >> rough consensus need to be reached for text changes in the document. >> >> Actually the members of the working group have much more influence on >> >> a working group document, than on an individual draft. >> >> It would be far better if we now focused on proposing text changes, >> >> rather than discussing processes." >> >> >> >> This is a serious issue; we need to remove section 6 from draft- >> farrel-mpls-sfc to move forward. These contents will proceed in draft-xu= *, >> where the contents started initially. Everyone will have a fair chance t= o >> contribute to the contents as part of collaborations on draft-xu*. >> >> >> >> Thanks >> >> >> >> Regards =E2=80=A6 Zafar >> >> >> >> > --000000000000719a1a056a09ee49 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
--000000000000719a1a056a09ee49-- From nobody Tue Apr 17 07:22:58 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F128812D94E for ; Tue, 17 Apr 2018 07:22:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.909 X-Spam-Level: X-Spam-Status: No, score=-1.909 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, T_DKIMWL_WL_MED=-0.01, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=herbertland-com.20150623.gappssmtp.com 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 zXrXDndmztU4 for ; Tue, 17 Apr 2018 07:22:47 -0700 (PDT) Received: from mail-qt0-x234.google.com (mail-qt0-x234.google.com [IPv6:2607:f8b0:400d:c0d::234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4E74012D964 for ; Tue, 17 Apr 2018 07:22:47 -0700 (PDT) Received: by mail-qt0-x234.google.com with SMTP id a25so12763844qtm.1 for ; Tue, 17 Apr 2018 07:22:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=herbertland-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=bCTmpLd5F1RIJgSQZYHYotj2csGMi0rsi4ym5PHS4ks=; b=Xd5M8THymwX6fTxUI4CSC/1j6WmAHhSUGeUD0/Ge19PZs8B5PPYJ2e6zP903F2QX2e YzNKhJzsjP0sn7Nr6bm5rmkWj+NdBadp50fYc+bhHVlT7AeSD0qwepHVouKX3kvoeEvN 9bV6RyHA24hHGwe8cjcin9lds65avGplzuMzBeNeKewzd9lVm1fspZv6C+2z7Gq4Ocxr 6MJBpPaf+G1eeSPM/Gnfflw9UG5zw7/kANSuaciL9Q8vZ7R018NK699GlTdtW0unLmoD KVBKUGTtpGBvOsSedo5ota075NWaLyhV+RD9r+ictuXcBXWIe2flhFVPCsx77t/wJvfy 0v0w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=bCTmpLd5F1RIJgSQZYHYotj2csGMi0rsi4ym5PHS4ks=; b=jsGZWVyllFnIvpkNirnNF+S3ltLeVn1NqUZF3cqC+N2KI+dYBqtUwy/ZMFDHr4UUyx BhUCO9lRaehiagScJlhqHFOWGDplPaTckzOoeEFXshOekn+Y5SAgdhgitM9R12yyiPhb ZbxKuXSfeRQbtor9nj4z30MTkqHDEcutVWMQEb7El+IOn8IV1yFXS1KT1ixv83Cnzhkf sKpO+RZzd31E27y1hcMwrs33iArXIw06XkusG57rQWp2GEOVovIdhIdIP0bGMjPufadP 0wz3n4UgXSjsoKkWkAe+Ji4VsUD0g0tDBz5R8Ml31ZlRwRLpf/dYdRdEaZuKiq+As5UT UMLw== X-Gm-Message-State: ALQs6tAJzuEtfo0yjTi361KxoHEMkHSr5m8focQ5/ZntF9wV3Z5kePEt 7aU6bdSquTa87qtUcpiE/cdOrK3pXNLQyBH32CFoPg== X-Google-Smtp-Source: AIpwx489ZldZ8pWRdAwzbNQk77Elxb8+zg0kZjRXvA2oQYp6DDJzpqiLt7v6lNBv2H5BuJ5xiuz681U2HZvkR1ayqGs= X-Received: by 10.237.62.103 with SMTP id m36mr2518948qtf.279.1523974966090; Tue, 17 Apr 2018 07:22:46 -0700 (PDT) MIME-Version: 1.0 Received: by 10.237.48.35 with HTTP; Tue, 17 Apr 2018 07:22:45 -0700 (PDT) In-Reply-To: References: <8d1b3bb4a1794c4fac3455257e0ab60e@XCH-RCD-008.cisco.com> From: Tom Herbert Date: Tue, 17 Apr 2018 07:22:45 -0700 Message-ID: To: "Frank Brockners (fbrockne)" Cc: Tianran Zhou , "Shwetha Bhandari (shwethab)" , Mickey Spiegel , NVO3 , Service Function Chaining IETF list , IETF IPPM WG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Apr 2018 14:22:51 -0000 On Tue, Apr 17, 2018 at 12:51 AM, Frank Brockners (fbrockne) wrote: > > Hi Tianran, > > Tom's note already includes the hint: You'll add IOAM data to the protoco= l/layer that you're interested in monitoring. Again using Geneve over IPv6 = as an example: > * If you're interested in the overlay, i.e. Geneve (e.g. timestamping the= packet when it enters and exists the tunnel) - you'd add IOAM data to Gene= ve > * If you're interested in the underlay, i.e. IPv6 (e.g. you'd like to und= erstand which path packets take in the v6 network) - you'd add IOAM data to= IPv6 > * If you're interested in both, then you'd add IOAM data to Geneve and IP= v6 > Frank, In that case why not just use a hop-by-hop option for measuring the underlay and a destination option for measuring the overlay? The advantage is that this works _any_ IP encapsulation method or any IP protocol for that matter. I don't believe adding ippm to every encapsulation protocol is straightforward: e.g. draft-brockners-ippm-ioam-geneve describe but notes the limited size of header, draft-weis-ippm-ioam-gre states that a new EtherType would be needed just for this purpose. This also entails additional encapsulation-specific HW support also, whereas support destination and hbh options could be more generic. Tom > Draft draft-ietf-ippm-ioam-data-02 already mentions layering (see section= 3): > "Layering: If several encapsulation protocols (e.g., in case of tunneling= ) are stacked on top of each other, IOAM data-records could be present at e= very layer. The behavior follows the ships-in-the-night model." > > Given the discussion here, we'll add some additional text in the next rev= ision to make things crisper (e.g. adding an example might help). > > Frank > > -----Original Message----- > From: Tianran Zhou > Sent: Dienstag, 17. April 2018 03:18 > To: Tom Herbert > Cc: Shwetha Bhandari (shwethab) ; Frank Brockners (fb= rockne) ; Mickey Spiegel ; NVO3 ; Service Function Chaining IETF list = ; IETF IPPM WG > Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various prot= ocols - follow up from WG discussion in London > > I think it's better that Frank or Shwetha can explain the multi-layer use= case in detail. > > Tianran >> -----Original Message----- >> From: Tom Herbert [mailto:tom@herbertland.com] >> Sent: Monday, April 16, 2018 10:40 PM >> To: Tianran Zhou >> Cc: Shwetha Bhandari (shwethab) ; Frank Brockners >> (fbrockne) ; Mickey Spiegel >> ; NVO3 ; int-area >> ; Service Function Chaining IETF list >> ; IETF IPPM WG >> Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various >> protocols - follow up from WG discussion in London >> >> On Mon, Apr 16, 2018 at 6:31 AM, Tianran Zhou w= rote: >> > Hi Shwetha, >> > >> > You are talking about the outer encapsution. It is straight forward >> > for the underlay to record by the header. But what about the >> > overlay, i.e., inner encapsulation(e.g. geneve)? Without special >> > configuration, intermediate node will not read the inner header, >> > hence not be able to process IOAM.e >> >> Hi Tianran, >> >> I believe that is also not protocol conformant. Intermediate nodes >> should not be processing transport layer data as this can lead to >> misinterpretation and possibly silent data corruption. >> >> For instance, Geneve is a UDP encapsulation protocol with assigned port = 6081. >> In order for an intermediate device to process the Geneve >> encapsulation header it would need to look for packets with >> destination port of 6081 since that is the only possible >> discriminator. However, transport port numbers do not have global >> meaning and hosts may use port numbers for other purposes (RFC7605 >> describes this). So a packet to port 6081 might be something other >> than Geneve and may be misinterpreted. If a misinterpreted packet is cha= nged (like ippm data is written) then that would be systematic silent data = corruption. >> >> As far as I know, hop-by-hop options is the only protocol confirming >> mechanism that allows an intermediate note to change data of packet in f= light. >> Encpasulation is the only conforming mechanism that allows an >> intermediate node to add data (like extension headers) to a packet in fl= ight. >> >> Tom >> >> > Maybe we are not synced by this overlay/underlay use case. :-) >> > >> > Tianran >> > >> > >> > >> > ________________________________ >> > Sent from WeLink >> > >> > =E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A Shwetha Bhandari (shwethab) >> > =E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A Tianran Zhou;Frank Brockners >> > (fbrockne);Mickey >> > Spiegel;Tom >> > Herbert >> > =E6=8A=84=E9=80=81=EF=BC=9A NVO3;int-area;Service Function >> > Chaining IETF list;IETF IPPM WG >> > =E4=B8=BB=E9=A2=98=EF=BC=9A Re: [ippm] [Int-area] encapsulation of IOA= M data in various >> > protocols - follow up from WG discussion in London >> > =E6=97=B6=E9=97=B4=EF=BC=9A 2018-04-16 18:17:01 >> > >> > Hi Tianran, >> > >> >> If I recall right, it is not written in the ioam data draft. >> > >> > Data draft is defining the data to be carried in IOAM in an >> > encapsulation agnostic way, it does not specify how the >> > encapsulation protocol is configured. >> > >> > >> > >> >> Yes, node by node configuration is an easy way. >> > >> > While it is, it does not have to be a node by node configuration. It >> > can be part of the encapsulation definition. >> > >> > For e.g. If the encapsulation is IPv6 and if we define the data to >> > be carried as HbH options, then based on the Option Type with >> > highest order 2 bits set to 00 then the v6 nodes that implement IOAM >> > will process the option and others will skip over. >> > >> > >> > >> > >> > >> > Thanks, >> > >> > Shwetha >> > >> > >> > >> > From: ippm on behalf of Tianran Zhou >> > >> > Date: Monday, April 16, 2018 at 2:36 PM >> > To: "Frank Brockners (fbrockne)" , Mickey >> > Spiegel , Tom Herbert >> > >> > Cc: NVO3 , "int-area@ietf.org" , >> > Service Function Chaining IETF list , IETF IPPM WG >> > >> > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various >> > protocols - follow up from WG discussion in London >> > >> > >> > >> > Hi Frank, >> > >> > >> > >> > If I recall right, it is not written in the ioam data draft. >> > >> > Yes, node by node configuration is an easy way. In the >> > draft-zhou-ippm-ioam-yang, we have the =E2=80=9Cprotocol-type=E2=80=9D= to indicate >> > the layering. >> > >> > +--rw ioam >> > >> > +--rw ioam-profiles >> > >> > +--rw enabled? boolean >> > >> > +--rw ioam-profile* [profile-name] >> > >> > +--rw profile-name string >> > >> > +--rw filter >> > >> > | +--rw filter-type? ioam-filter-type >> > >> > | +--rw acl-name? -> /acl:acls/acl/name >> > >> > +--rw protocol-type? ioam-protocol-type >> > >> > +--rw incremental-tracing-profile {incremental-trace}? >> > >> > | ... >> > >> > +--rw preallocated-tracing-profile {preallocated-trace}? >> > >> > | ... >> > >> > +--rw pot-profile {proof-of-transit}? >> > >> > | ... >> > >> > +--rw e2e-profile {edge-to-edge}? >> > >> > ... >> > >> > >> > >> > >> > >> > Tianran >> > >> > From: Frank Brockners (fbrockne) [mailto:fbrockne@cisco.com] >> > Sent: Monday, April 16, 2018 4:51 PM >> > To: Tianran Zhou ; Mickey Spiegel >> > ; Tom Herbert >> > Cc: NVO3 ; int-area@ietf.org; Service Function >> > Chaining IETF list ; IETF IPPM WG >> > Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various >> > protocols - follow up from WG discussion in London >> > >> > >> > >> > Hi Tianran, >> > >> > >> > >> > IOAM is a domain specific feature (see also >> > draft-ietf-ippm-ioam-data-02 sections 3 and 4), which allows an >> > operator to control by means of configuration where and for which >> > traffic IOAM data fields are added/updated/removed from the customer >> > traffic. Using your example of Geneve over IPv6 =E2=80=93 with IOAM da= ta in >> > both the Geneve and the IPv6 protocol, one would expect that the >> > operator configures the endpoints of the Geneve tunnel to operate on >> > the IOAM data in Geneve, and the IPv6 routers that the Geneve tunnel >> traverses to operate on the IOAM data in IPv6. >> > >> > >> > >> > Frank >> > >> > >> > >> > From: Tianran Zhou >> > Sent: Montag, 16. April 2018 10:37 >> > To: Frank Brockners (fbrockne) ; Mickey Spiegel >> > ; Tom Herbert >> > Cc: NVO3 ; int-area@ietf.org; Service Function >> > Chaining IETF list ; IETF IPPM WG >> > Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various >> > protocols - follow up from WG discussion in London >> > >> > >> > >> > Hi Frank, >> > >> > >> > >> > How does a forwarder know when and where to insert the data? >> > >> > In the case of Geneve over IPv6, do you mean the device need to scan >> > all the protocol stack? Or just the outer encapsulation? >> > >> > >> > >> > Tianran >> > >> > >> > >> > From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Frank >> > Brockners >> > (fbrockne) >> > Sent: Monday, April 16, 2018 3:08 PM >> > To: Mickey Spiegel ; Tom Herbert >> > >> > Cc: NVO3 ; int-area@ietf.org; Service Function >> > Chaining IETF list ; IETF IPPM WG >> > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various >> > protocols - follow up from WG discussion in London >> > >> > >> > >> > >> > >> > Tom, >> > >> > >> > >> > a quick addition to what Mickey mentioned below: What you seem to >> > have in mind is what draft-ietf-ippm-ioam-data-02 refers to as =E2=80= =9Clayering=E2=80=9D >> > (see section 3.), i.e. if you=E2=80=99re running for example Geneve ov= er >> > IPv6, then IOAM data could be encapsulated in both protocols, Geneve >> > and >> > IPv6 =E2=80=93 giving you visibility into the =E2=80=9Cunderlay=E2=80= =9D (IPv6) and the =E2=80=9Coverlay=E2=80=9D >> (Geneve). >> > >> > >> > >> > Frank >> > >> > >> > >> > From: ippm On Behalf Of Mickey Spiegel >> > Sent: Freitag, 13. April 2018 20:22 >> > To: Tom Herbert >> > Cc: NVO3 ; int-area@ietf.org; Service Function >> > Chaining IETF list ; IETF IPPM WG >> > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various >> > protocols - follow up from WG discussion in London >> > >> > >> > >> > Tom, >> > >> > >> > >> > On Thu, Apr 12, 2018 at 10:17 PM, Tom Herbert wr= ote: >> > >> > Mickey, >> > >> > Looking at these ippm drafts more closely, I have a much more >> > fundamental concern. >> > >> > In draft-brockners-ippm-ioam-geneve-00 for instance, there is the >> > text in the introduction: >> > >> > "In-situ OAM (IOAM) records OAM information within the packet while >> > the packet traverses a particular network domain. The term "in-situ" >> > refers to the fact that the IOAM data fields are added to the data >> > packets rather than is being sent within packets specifically >> > dedicated to OAM. This document defines how IOAM data fields are >> > transported as part of the Geneve [I-D.ietf-nvo3-geneve] >> > encapsulation." >> > >> > I assume this means that as packets with Geneve encapsulation >> > traverse the network they are interpreted by intermediate nodes as >> > being Geneve. Since Geneve is a UDP encapsulation, then the >> > destination UDP port number would be used to identify packets as >> > being Geneve. So an intermediate device might be looking for UDP >> > packets destined to port >> > 6081 (the assigned UDP port for Geneve). If my understanding is >> > correct, then this is a problem. >> > >> > UDP port numbers do not have global meaning. An intermediate device >> > may very well see UDP packets destined to port 6081 that are not >> > actually Geneve. This scenario is discussed in RFC7605: >> > >> > "...intermediate device interprets traffic based on the port number. >> > It is important to recognize that any interpretation of port numbers >> > -- except at the endpoints -- may be incorrect, because port numbers >> > are meaningful only at the endpoints." >> > >> > If the UDP data is modified, as the draft would imply, then >> > misinterpretation may also mean silent data corruption of packets. A >> > protocol that would allow this seems pretty incorrect! Note that >> > this would be true also for any UDP encapsulation that the network >> > tries to interpret. >> > >> > >> > >> > The intention is to allow for multiple nodes that a packet traverses >> > >> > to be able to insert IOAM node information in the same trace option, >> > >> > but leave some flexibility regarding which nodes actually do the >> > >> > IOAM processing and the node information. This may vary >> > >> > depending on the transport. >> > >> > >> > >> > In case of a tunneled encapsulation such as Geneve or VXLAN, >> > >> > there may still be multiple hops. For example a network may use >> > >> > Geneve or VXLAN, but only do L2 processing at ToRs, with L3 >> > >> > processing done at aggregation or core switches. In this case >> > >> > many packets would do 2 Geneve or VXLAN hops, so the packet >> > >> > would contain IOAM node information from two nodes. >> > >> > >> > >> > Another example is service function chaining using Geneve or >> > >> > VXLAN rather than NSH. >> > >> > >> > >> > >> > I am also wondering if hop-by-hop options been considered for this >> > application? Their interpretation in the network is unabiguous and >> > they also have the advantage that the work with any IP protocol or >> > encapsulation. >> > >> > >> > >> > IPv6 hop-by-hop options has been considered. See >> > >> > draft-brockners-inband-oam-transport-05. This has not yet been >> > >> > broken out into a separate draft. >> > >> > >> > >> > Mickey >> > >> > >> > >> > >> > Thanks, >> > Tom >> > >> > >> > On Thu, Apr 12, 2018 at 3:31 PM, Mickey Spiegel >> > wrote: >> > >> >> Tom, >> >> >> >> On Thu, Apr 12, 2018 at 2:46 PM, Tom Herbert wr= ote: >> >>> >> >>> On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky >> >>> >> >>> wrote: >> >>> > Hi Frank, >> >>> > thank you for sharing your points. Please find my notes in-line >> >>> > and tagged >> >>> > GIM>>. I believe that this is very much relevant to work of >> >>> > GIM>>other >> >>> > working >> >>> > groups that directly work on the overlay encapsulations in the >> >>> > center of the discussion and hence I've added them to the list. >> >>> > Hope we'll have more opinions to reach the conclusion that is >> >>> > acceptable to all. >> >>> > >> >>> > Regards, >> >>> > Greg >> >>> > >> >>> > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) >> >>> > wrote: >> >>> >> >> >>> >> Back at the IPPM meeting in London, we discussed several drafts >> >>> >> dealing with the encapsulation of IOAM data in various >> >>> >> protocols (draft-brockners-ippm-ioam-vxlan-gpe-00, >> >>> >> draft-brockners-ippm-ioam-geneve-00, >> >>> >> draft-weis-ippm-ioam-gre-00). One discussion topic that we >> >>> >> decided to take to the list was the question on whether >> >>> >> draft-ooamdt-rtgwg-ooam-header could be leveraged.. After >> >>> >> carefully considering draft-ooamdt-rtgwg-ooam-header, I came to >> >>> >> the conclusion that the =E2=80=9COOAM header=E2=80=9D does not me= et the needs >> >>> >> of >> >>> >> IOAM: >> >>> >> >> >>> >> * Efficiency: IOAM adds data to live user traffic. As such, an >> >>> >> encapsulation needs to be as efficient as possible. The =E2=80=9C= OOAM header=E2=80=9D >> >>> >> is 8 >> >>> >> bytes long. The approach for IOAM data encapsulation in the >> >>> >> above mentioned drafts only requires 4 bytes. Using the OOAM >> >>> >> header approach would add an unnecessary overhead of 4 bytes =E2= =80=93 >> >>> >> which is significant. >> >>> Greg, >> >>> >> >>> I'm missing something here. I looked at the drafts you referenced >> >>> and each of them looks like the overhead for OAM is greater that >> >>> four bytes. In each there is some overhead equivalent to >> >>> type/length, for instance in Geneve four bytes are needed for >> >>> option class, type, and length. Unless the the OAM data is zero >> >>> length, I don't see how this adds up to only four bytes of overhead. >> >> >> >> >> >> The four versus eight bytes just refers to the fields in the four >> >> bytes of IOAM info, that is common to all IOAM options. Beyond >> >> that, there are IOAM option specific fields. For example if doing >> >> one of the IOAM trace options, there are four bytes of trace option >> >> header, including the IOAM-trace-type, NodeLen, Flags, and >> >> RemainingLen fields. These are followed by the node data list >> >> containing the per hop IOAM information. >> >> >> >> In looking at the OOAM header content, it has nothing to do with >> >> any of the IOAM information after the first four bytes. It contains >> >> another variant of the information in the first four bytes of IOAM >> >> info, spread out over eight bytes. >> >> >> >>> >> >>> Tom >> >>> >> >>> > >> >>> > GIM>> The difference in four octets is because OOAM Header: >> >>> > >> >>> > provides more flexibility, e.g. Flags field and Reserved fields; >> >> >> >> >> >> The flags field only has one defined flag at the moment, for a >> >> timestamp block. For IOAM trace we need per hop timestamps, which >> >> the timestamp block cannot address, i.e. the timestamp block is >> >> redundant for >> IOAM. >> >> >> >>> >> >>> > supports larger OAM packets than iOAM header; >> >> >> >> >> >> For IOAM purposes, 1020 octets is more than enough. >> >> >> >>> >> >>> > is future proof by supporting versioning (Version field). >> >> >> >> >> >> IMO, taking the first two bits of the IOAM-Type to define a Version >> >> field would be a good thing. This does not require adding four more >> >> bytes of overhead. 64 IOAM-Types is more than enough. >> >> >> >>> >> >>> >> >> >>> >> * Maturity: IOAM has several implementations, which were also >> >>> >> shown at recent IETF hackathons =E2=80=93 and we=E2=80=99re expec= ting >> >>> >> additional implementations to be publicized soon. Interoperable >> >>> >> implementations need timely specifications. Despite the >> >>> >> question being asked, the recent thread on OOAM in the NVO3 >> >>> >> list hasn=E2=80=99t revealed any implementation of the OOAM heade= r. >> >>> >> In >> >>> >> addition, the thread revealed that several fundamental >> >>> >> questions about the OOAM header are still open, such as whether >> >>> >> or how active OAM mechanisms within protocols such as Geneve >> >>> >> would apply to the OOAM header. This ultimately means that we >> >>> >> won=E2=80=99t get to a timely specification. >> >>> > >> >>> > GIM>> May I ask which encapsulations supported by the >> >>> > GIM>> implementations >> >>> > you >> >>> > refer to. Until very recently all iOAM proposals were to use >> >>> > meta-data TLV in, e.g. Geneve and NSH. And if these or some of >> >>> > these implementations already updated to the newly proposed iOAM >> >>> > shim, I don't see problem in making them use OOAM Header. Would >> >>> > you agree? >> >>> > >> >>> >> >> >>> >> * Scope: It isn=E2=80=99t entirely clear to which protocols the O= OAM >> >>> >> header would ultimately apply to. The way the OOAM header is >> >>> >> defined, OOAM uses a 8-bit field for =E2=80=9CNext Prot=E2=80=9D,= the next >> >>> >> protocol. Some protocols that IOAM data needs to be >> >>> >> encapsulated into use 16-bits for their next protocol code points= . See e.g. >> >>> >> the GRE encapsulation =E2=80=93 as specified in >> >>> >> draft-weis-ippm-ioam-gre-00. >> >>> > >> >>> > GIM>> The first paragraph of the Introduction section states: >> >>> > New protocols that support overlay networks like VxLAN-GPE >> >>> > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve >> >>> > [I-D.ietf-nvo3-geneve], BIER >> >>> > [I-D.ietf-bier-mpls-encapsulation], >> and >> >>> > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. >> >>> > Ethernet, IPv4/IPv6, and recognize Operations, Administration, = and >> >>> > Maintenance (OAM) as one of distinct types. That ensures that >> >>> > Overlay OAM (OOAM)packets are sharing fate with Overlay data pa= cket >> >>> > traversing the underlay. >> >>> > I'm updating the OOAM Header draft and along with cleaning nits >> >>> > will update reference to GUE. I think that the list and the >> >>> > statemnt are quite clear in identifying the scope of networks >> >>> > that may benefit from using not only common OOAM Header but >> >>> > common OOAM mechanisms, e.g. Echo Request/Reply. >> >>> > >> >>> >> With the above in mind, I=E2=80=99d suggest that the WG moves for= ward >> >>> >> with specific definitions for encapsulating IOAM data into >> >>> >> protocols =E2=80=93 per the above mentioned drafts. >> >>> >> >> >>> >> >> >>> >> >> >>> >> Regards, Frank >> >>> >> >> >>> >> >> >>> >> _______________________________________________ >> >>> >> ippm mailing list >> >>> >> ippm@ietf.org >> >>> >> https://www.ietf.org/mailman/listinfo/ippm >> >>> >> >> >>> > >> >>> > >> >>> > _______________________________________________ >> >>> > Int-area mailing list >> >>> > Int-area@ietf.org >> >>> > https://www.ietf.org/mailman/listinfo/int-area >> >>> > >> >>> >> >>> _______________________________________________ >> >>> ippm mailing list >> >>> 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15.00.1320.000; Wed, 18 Apr 2018 02:51:40 -0500 From: "Frank Brockners (fbrockne)" To: Tom Herbert CC: Tianran Zhou , "Shwetha Bhandari (shwethab)" , Mickey Spiegel , NVO3 , Service Function Chaining IETF list , "IETF IPPM WG" Thread-Topic: [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AQHT01Rv7uw9TGdqO0+V2HJ61OA6MaQC+nQwgABu/4D//63XQIAAWkqAgAATngCAADaJgIAAEx0AgACyKYCAABh5EIAAwsqAgADPxZA= Date: Wed, 18 Apr 2018 07:51:40 +0000 Message-ID: References: <8d1b3bb4a1794c4fac3455257e0ab60e@XCH-RCD-008.cisco.com> In-Reply-To: Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.55.117.3] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in 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X19fXw0KPj4gPj4+ID4+IGlwcG0gbWFpbGluZyBsaXN0DQo+PiA+Pj4gPj4gaXBwbUBpZXRmLm9y Zw0KPj4gPj4+ID4+IGh0dHBzOi8vd3d3LmlldGYub3JnL21haWxtYW4vbGlzdGluZm8vaXBwbQ0K Pj4gPj4+ID4+DQo+PiA+Pj4gPg0KPj4gPj4+ID4NCj4+ID4+PiA+IF9fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fDQo+PiA+Pj4gPiBJbnQtYXJlYSBtYWlsaW5n IGxpc3QNCj4+ID4+PiA+IEludC1hcmVhQGlldGYub3JnDQo+PiA+Pj4gPiBodHRwczovL3d3dy5p ZXRmLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2ludC1hcmVhDQo+PiA+Pj4gPg0KPj4gPj4+DQo+PiA+ Pj4gX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18NCj4+ID4+ PiBpcHBtIG1haWxpbmcgbGlzdA0KPj4gPj4+IGlwcG1AaWV0Zi5vcmcNCj4+ID4+PiBodHRwczov L3d3dy5pZXRmLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2lwcG0NCj4+ID4+DQo+PiA+Pg0KPj4gPg0K Pj4gPg0K From nobody Wed Apr 18 01:08:33 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 601FA12711E for ; Wed, 18 Apr 2018 01:08:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.201 X-Spam-Level: X-Spam-Status: No, score=-4.201 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, 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 USwFtX2OHgaU for ; Wed, 18 Apr 2018 01:08:29 -0700 (PDT) Received: from linzer.ki.iif.hu (linzer.ki.iif.hu [193.224.163.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 41DFC126CBF for ; Wed, 18 Apr 2018 01:08:29 -0700 (PDT) Received: from cirkusz.lvs.iif.hu (cirkusz.lvs.iif.hu [193.225.14.182]) by linzer.ki.iif.hu (Postfix) with ESMTP id 825E34060C4 for ; Wed, 18 Apr 2018 10:08:27 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at cirkusz.lvs.iif.hu Received: from linzer.ki.iif.hu ([IPv6:::ffff:193.224.163.7]) by cirkusz.lvs.iif.hu (cirkusz.lvs.iif.hu [::ffff:193.225.14.72]) (amavisd-new, port 10024) with ESMTP id Yj6JOnkbfl48 for ; Wed, 18 Apr 2018 10:08:27 +0200 (CEST) Received: from [IPv6:2001:db8:21:0:221a:6ff:fe6d:1304] (unknown [IPv6:2001:470:1f1a:308::dead:beef]) by linzer.ki.iif.hu (Postfix) with ESMTPSA id E38AA4060C2 for ; Wed, 18 Apr 2018 10:08:26 +0200 (CEST) To: sfc@ietf.org From: matecs Message-ID: <010d5a12-fecd-3707-dd17-b9631753cced@niif.hu> Date: Wed, 18 Apr 2018 10:08:26 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: [sfc] request for a quick interop X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Apr 2018 08:08:31 -0000 hi, sorry for bothering you with it but i'm just finished my free/opensource nsh implementation in freerouter.nop.hu. i'm currently be able to forward, en/decapsulate nsh packets over physical or tunnel interfaces as described in the architecture and moreover i'm be able to rewrite the nsh header to an other path/index. in case of decap, i handle np=ip, eth, nsh and mpls. i'm also able to steer traffic into/from a path from pbr (bp=ip) or a whole interface (np=eth)... if anybody out there interested in a quick interop test, feel free to reach me... thanks, csaba mate From nobody Thu Apr 19 01:29:23 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 52A08126D3F; Thu, 19 Apr 2018 01:29:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 mEAcAMGqRjdW; Thu, 19 Apr 2018 01:29:12 -0700 (PDT) Received: from mail-qk0-x22a.google.com (mail-qk0-x22a.google.com [IPv6:2607:f8b0:400d:c09::22a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AF00F126C25; Thu, 19 Apr 2018 01:29:11 -0700 (PDT) Received: by mail-qk0-x22a.google.com with SMTP id d74so4666576qkg.4; Thu, 19 Apr 2018 01:29:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to:cc; bh=TN6VU+dpzbY4JgS7qIe/l8leAH/Rcmt0cxf7GqgFUw8=; b=OqMuuoSyEz058F/j24NmwC5E5ed6P5hH1P3sR8aEFodCXyL+9dsdYHG02UAKv9RBAQ Wyrq1JmXpsxGTenqElXsfRMfYlFGYa0h5z34Jagd5MPP1zBCQm/MJXDnLFtIbt2uvDEG weJxRlkiIpqEFxjYXTh+1sONN1eWrnaBKXbMb96xbg6m1dv8D99NSgsOBz5f/ZndM1Ar DTii8UaXPDjPCnEKjBLmCImjiKs8W72IFIp16iTBQbHunYNY6zWo/0i6DtIC+ZlbYskn A4GiS3qIJCrJbYB3xBqEkt0TdqC0RWpIRoq+rBckL+mHGv2CJlTeW2xWESdf5iabMFiH AF6Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=TN6VU+dpzbY4JgS7qIe/l8leAH/Rcmt0cxf7GqgFUw8=; b=anO4RScAP2X4nkkRntomRMGVdSXWJaoYDBNLAca7fbr7jZoYNVAyLwU1FrDybHwB8a hJf56Dm0G17jiZX3prgVgPGxNoZG5JUsF26SR7JaiLZZ/yA41j1NYPLsvzvf3XnDGqca pZ4bKgqHH2Vy4+njIrXIpQD7cotoCZuwuGyoz4C2j9ljLmlNJDWMCdrghIgAzvuXSMDB KsFRIVLSyzQsPpiziJROojtpGXzU79v/nlZUn+yrmyyhWNrX/7o1kHEPx9opIeM8UTID B5iYOgByQbaBeX9MN87oF2CH3yK+tshijCw8FqtMURsdZK+vjJX1jXiRZQ1oBb7RAHjv TAeg== X-Gm-Message-State: ALQs6tDsg7n7iMsqLjtNeFrFV7aKyTZVNu9DM/mbc14loyC5IsAzfWZF kj1E5WBeR7diMapkYnFGXY9ptyMg8S0Chi2HGLQ= X-Google-Smtp-Source: AIpwx4/WLZ2X9injNe65rVG4ZcCEGZ0RYFh4XIq+h4cnpl0Ho6CCq6IBuonuirBu02qSo6AY9+V8ZkHqtDgqfJ7suio= X-Received: by 10.55.171.9 with SMTP id u9mr4863511qke.125.1524126550574; Thu, 19 Apr 2018 01:29:10 -0700 (PDT) MIME-Version: 1.0 Received: by 10.200.27.199 with HTTP; Thu, 19 Apr 2018 01:29:09 -0700 (PDT) From: Lizhong Jin Date: Thu, 19 Apr 2018 16:29:09 +0800 Message-ID: To: mpls Cc: Andrew Malis , "Zafar Ali (zali)" , spring@ietf.org, sfc , Stewart Bryant Content-Type: multipart/alternative; boundary="089e08e5931fa3ce44056a2f5d51" Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Apr 2018 08:29:16 -0000 --089e08e5931fa3ce44056a2f5d51 Content-Type: text/plain; charset="UTF-8" +1 to adopt both. Although the label stack is similar between draft-farrel section6 and draft-xuclad, but other points are different, e.g., meta data. If we consider a solution with several separate technical points, the two drafts do collapse in some points. But if you consider a solution as an integral one, the two drafts are different. BR Lizhong > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 15 Apr 2018 10:55:55 -0400 > From: "Andrew G. Malis" > To: "Zafar Ali (zali)" > Cc: "mpls@ietf.org" , SPRING WG List , > "sfc@ietf.org" , mpls > Subject: Re: [mpls] [sfc] Working Group adoption of > draft-farrel-mpls-sfc > Message-ID: > @mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Zafar, et al, > > Perhaps the fairest to all concerned is for the MPLS WG to adopt both > drafts, and then it will be up to the WG (rather than the authors) to best > determine the technical details going forward, and how best to document > them. That way the work becomes the consensus product of the WG. > > Cheers, > Andy > > > On Sun, Apr 15, 2018 at 12:44 AM, Zafar Ali (zali) wrote: > > > Dear Stewart, WG Chairs and the WG, > > > > > > > > I do not agree with Stewart?s points and will response in a separate > > email. But all that is just noise and that cannot resolve the issue at > > hand. > > > > > > > > A countless time, Xiaohu has raised the issue that the intellectual > > property for the contents in section 6 of draft-farrel-mpls-sfc belongs > to > > draft-xu-mpls-service-chaining. Please see one of Xiaohu's recent emails > > with the subject *"[spring] For the fairness and justice of the IETF > > culture"* dated Thursday, April 5, 2018 at 12:34 AM, copied in the > > following. > > > > > > > > This issue was also raised by many during the WG adoption poll of the > > document. The chairs adopted the work with the promise of fixing the > issue. > > Specifically, in the email to announce the adoption of the ID to the WG, > > the chair(s) mentioned the following: > > > > > > > > "That decision is taken, the issues that has been pointed out are > > > > noted. These issues need to be resolved on the mailing list and > > > > rough consensus need to be reached for text changes in the document. > > > > Actually the members of the working group have much more influence on > > > > a working group document, than on an individual draft. > > > > It would be far better if we now focused on proposing text changes, > > > > rather than discussing processes." > > > > > > > > This is a serious issue; we need to remove section 6 from draft- > > farrel-mpls-sfc to move forward. These contents will proceed in > draft-xu*, > > where the contents started initially. Everyone will have a fair chance to > > contribute to the contents as part of collaborations on draft-xu*. > > > > > > > > Thanks > > > > > > > > Regards ? Zafar > > > > > > > > *From: *spring on behalf of "???(??)" < > > xiaohu.xxh@alibaba-inc.com> > > *Date: *Thursday, April 5, 2018 at 12:34 AM > > *To: *"mpls@ietf.org" , SPRING WG List > > *Cc: *"ietf@ietf.org" > > *Subject: *[spring] For the fairness and justice of the IETF culture//Re: > > [mpls] What to do with draft-ietf-mpls-sfc-00.txt > > > > > > > > Hi all, > > > > > > > > As I had pointed out before, this draft describes two MPLS-based SFC > > > > approaches: one is how to encode the NSH info, more specifically, the SPI > > > > and SI info by two MPLS labels, which is still a stateful SFC mechanism > > > > just like NSH; another is how to leverage the MPLS-SR to realize a > > > > stateless SFC (see section 6). > > > > > > > > It has been pointed out by many people that section 6 of the draft copies > > > > the > > > > idea of (https://tools.ietf.org/html/draft-xu-mpls-service-chaining) > > > > without any technology contribution except replacing ?MPLS Segment > > > > Routing? by ?Label Stack?. Funnily, one author of draft-ietf-mpls-sfc > > > > had inadvertently admitted > > > > "using a different name for the same thing is not so clever" (see > > > > https://mailarchive.ietf.org/arch/msg/mpls/y7FTc38ysVf6PyJlA04MEFSN9nc) > in > > > > another thread. > > > > > > > > IMHO, the indulgence towards such behavior of copying > > > > ideas of existing drafts with word tricks would seriously trample > > > > underfoot the fairness and justice of the IETF culture. At least, it > would > > > > badly damage the interest and enthusiasm of IETF participants, especially > > > > newcomers and non-native speakers of English. > > > > > > > > Best regards, > > > > Xiaohu > > > > > > > > > > > > > > > > > > > > *From: *mpls on behalf of Stewart Bryant < > > stewart.bryant@gmail.com> > > *Date: *Friday, April 13, 2018 at 3:10 AM > > *To: *"???(??)" > > *Cc: *"mpls@ietf.org" , mpls , > > Robert Raszuk , "sfc@ietf.org" > > *Subject: *Re: [mpls] [sfc] Working Group adoption of > > draft-farrel-mpls-sfc > > > > > > > > > > > > > > > > On 13/04/2018 08:23, ???(??) wrote: > > > > Hi Stewart, > > > > > > > > Thanks for your response. For the SR-based SFC mechanism that has been > > described in draft-xuclad*, it's not helpful to describe it again in > > another draft. The most simple and efficient way to address the > > overlapping issue is to reference draft-xuclad* rather than > > "using a different name for the same thing". I'm looking forward to > > seeing the revision of draft-farrel* that would address the overlapping > > issue concretely. > > > > > > Please read what I said. > > > > There are subtle but important technical differences between the two > > approaches. > > > > - Stewart > > > > > > > > > > If co-authors of draft-farrel* believed the current text as described in > > draft-xuclad* is not good enough or misses something important, any > > comments and suggestions are more than welcome. > > > > > > I will send you some text to include in draft-xuclad that points to the > > important differences in the approach taken in draft-farrel. This will > > clarify the issue to the reader. > > > > I hope that this is an acceptable resolution of this issue. > > > > - Stewart > > > > > > > > > > > > Best regards, > > > > Xiaohu > > > > ------------------------------------------------------------------ > > > > Stewart Bryant > > > > 2018?4?13?(???) 13:27 > > > > ???(??) > > > > mpls ; "Bernier, Daniel" > > ; Robert Raszuk > > ; mpls@ietf.org > > ; sfc@ietf.org > > > > Re: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc > > > > > > > > Hi Xiaohu > > > > > > > > What an earlier version of the draft said is of no importance. What it > > says going forward is what counts. > > > > > > > > Perhaps the way to address your concern is to include some text of the > > form that I used in my email of yesterday to describe to the reader the > > difference in approach. This is consistent with earlier advice in this > > discussion to reference the work from which this forked. > > > > > > > > - Stewart > > > > > > > > > > > > Sent from my iPad > > > > > > On 13 Apr 2018, at 03:35, ???(??) wrote: > > > > Hi Stewart, > > > > > > > > If draft-farrel* was just describing an MPLS-based SFC technology that is > > different from the MPLS-SR-based SFC technology that has been described > in > > draft-xuclad*, that would be fine. However, draft-farrel* also described > > the technology that has been described in draft-xuclad* (see section 6) > by > > "using a different name for the same thing". Note that the title of > > section 6 in those pervious versions of draft-farrel* is > > > > "MPLS Segment Routing". One co-author of draft-farrel* said they worked > very hard to change the "Segment Routing" term to "label stack" term in the > new version of draft-farrel* in order to deal with the overlapping issue. > However, such change is just "using a different name for the same thing", > and it doesn't solve the overlapping issue at all, as had been pointed out > by many people. As said by one co-author of draft-farrel*, in a thread > which is irrelavant to this overlapping issue, "using a different name for > the same thing is not so clever:)". In fact, it would cause unneccessary > confusions to implementors by describing the same technology within > different drafts. More badly, it would set a bad precedant in the IETF of > copying the idea of the existing draft by "using a different name for the > same thing". > > > > > > > > Best regards, > > > > Xiaohu > > > > ------------------------------------------------------------------ > > > > Stewart Bryant > > > > 2018?4?12?(???) 23:04 > > > > "Bernier, Daniel" ; Robert Raszuk < > > robert@raszuk.net> > > > > mpls@ietf.org ; sfc@ietf.org > > > > Re: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc > > > > > > > > > > Rather than have a process discussion, I think we should go up a level > > and better understand the technical differences between the two drafts. > > > > draft-farrel-mpls-sfc describes the actions at a hop in terms of a tuple > > that mirrors the SFC approach that allows a short indication of > > potentially re-entrant chains. In its simplest form it uses a compact > > MPLS stack to describe an arbitarily complex path that is compatile with > > simple edge routers which are often challenged in terms of the number of > > labels that they can push. > > > > draft-xu-clad-spring-sr-service-chaining unrolls the path and explicitly > > calls out each hop and each function into the label stack. This results > > in a much larger MPLS label stack that will challenge some edge routers. > > The way that we generally deal with imposition limits is through the use > > of binding-SIDs, which in the limiting case resolves to the approach in > > draft-farrel with the limitation that the position on the path is > > implicit in the label stack size rather than explicitly > > specified by the SI. > > > > Mid-flight path changes (if such things are needed) is clearly simpler > > with draft-farrel. > > > > The short stack in draft-farrel comes at the cost of greater network > > forwarding stack, and the long stack is the price that draft-xu-clad > > pays for the reduction in forwarding state. > > > > The optimal design point between forwarding and control plane state is > > something that is dependent on many parameters, and is dependent on many > > network and operational factors, so much so, that don't think it is wise > > to rule either out of scope at this stage. > > > > The hybrid mode in section 6 of draft-farrel supports the mixed mode in > > section 7 of the draft. This allows the construction of SFCs that are > > the concatination of two or more compacted sub-chains. This allows the > > operator to deploy a solution with the advantages of draft-farrel > > together with some of the flexibility of draft-xu-clad. > > > > At this stage the two drafts are sufficienly different that I think we > > need to proceed with both at least to the point where we fully > > understand the detailed consequences of the two approachs and the > > scenarios where each finds it's niche. > > > > After developing a better understanding the detail of each design, their > > control plane, and operational contexts and how each maps to customer > > network requirements, we can move the drafts to the appropriate IETF > > track. Such tracks may be anything from abandonment to IETF standard for > > one or both of these approaches. > > > > Meanwhile I think that we need to focus our efforts on a deeper > > understanding of the technology and how each might make the Internet > > work better, rather than spending effort on arguing about IETF process. > > > > - Stewart > > > > _______________________________________________ > > mpls mailing list > > mpls@ietf.org > > https://www.ietf.org/mailman/listinfo/mpls > > > > > > > > _______________________________________________ > > mpls mailing list > > mpls@ietf.org > > https://www.ietf.org/mailman/listinfo/mpls > > > > > > > > > > > > > > _______________________________________________ > > mpls mailing list > > mpls@ietf.org > > https://www.ietf.org/mailman/listinfo/mpls > > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: 20180415/9a47c611/attachment.html> > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls > > > ------------------------------ > > End of mpls Digest, Vol 168, Issue 18 > ************************************* > --089e08e5931fa3ce44056a2f5d51 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
+1 to adopt both.
Although the label stack is similar betwee= n draft-farrel section6 and draft-xuclad, but other points are different, e= .g., meta data. If we consider a solution with several separate technical p= oints, the two drafts do collapse in some points. But if you consider a sol= ution as an integral one, the two drafts are different.

B= R
Lizhong


-----------------------------------------------------------------= -----

Message: 1
Date: Sun, 15 Apr 2018 10:55:55 -0400
From: "Andrew G. Malis" <= agmalis@gmail.com>
To: "Zafar Ali (zali)" <zali= @cisco.com>
Cc: "mpls@ietf.org" <mpls@ietf.org>, SPRING WG List <spring@ietf.org>,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 "sfc@ietf.= org" <sfc@ietf.org>, mpl= s <mpls-bounces@ietf.org>= ;
Subject: Re: [mpls] [sfc] Working Group adoption of
=C2=A0 =C2=A0 =C2=A0 =C2=A0 draft-farrel-mpls-sfc
Message-ID:
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <CAA=3DduU0BWK9tik2FXvj_wqMbfMwp= 5XmU6ADNXE52bpetMXdczw@mail.gmail.com>
Content-Type: text/plain; charset=3D"utf-8"

Zafar, et al,

Perhaps the fairest to all concerned is for the MPLS WG to adopt both
drafts, and then it will be up to the WG (rather than the authors) to best<= br> determine the technical details going forward, and how best to document
them. That way the work becomes the consensus product of the WG.

Cheers,
Andy


On Sun, Apr 15, 2018 at 12:44 AM, Zafar Ali (zali) <zali@cisco.com> wrote:

> Dear Stewart, WG Chairs and the WG,
>
>
>
> I do not agree with Stewart?s points and will response in a separate > email. But all that is just noise and that cannot resolve the issue at=
> hand.
>
>
>
> A countless time, Xiaohu has raised the issue that the intellectual > property for the contents in section 6 of draft-farrel-mpls-sfc belong= s to
> draft-xu-mpls-service-chaining. Please see one of Xiaohu's re= cent emails
> with the subject *"[spring] For the fairness and justice of the I= ETF
> culture"* dated Thursday, April 5, 2018 at 12:34 AM, copied in th= e
> following.
>
>
>
> This issue was also raised by many during the WG adoption poll of the<= br> > document. The chairs adopted the work with the promise of fixing the i= ssue.
> Specifically, in the email to announce the adoption of the ID to the W= G,
> the chair(s) mentioned the following:
>
>
>
> "That decision is taken, the issues that has been pointed out are=
>
> noted. These issues need to be resolved on the mailing list and
>
> rough consensus need to be reached for text changes in the document. >
> Actually the members of the working group have much more influence on<= br> >
> a working group document, than on an individual draft.
>
> It would be far better if we now focused on proposing text changes, >
> rather than discussing processes."
>
>
>
> This is a serious issue; we need to remove section 6 from draft-
> farrel-mpls-sfc to move forward. These contents will proceed in draft-= xu*,
> where the contents started initially. Everyone will have a fair chance= to
> contribute to the contents as part of collaborations on draft-xu*.
>
>
>
> Thanks
>
>
>
> Regards ? Zafar
>
>
>
> *From: *spring <spring-b= ounces@ietf.org> on behalf of "???(??)" <
> xiaohu.xxh@alibaba-inc.c= om>
> *Date: *Thursday, April 5, 2018 at 12:34 AM
> *To: *"mpls@ietf.org" &= lt;mpls@ietf.org>, SPRING WG List &= lt;spring@ietf.org>
> *Cc: *"ietf@ietf.org" &= lt;ietf@ietf.org>
> *Subject: *[spring] For the fairness and justice of the IETF culture//= Re:
> [mpls] What to do with draft-ietf-mpls-sfc-00.txt
>
>
>
> Hi all,
>
>
>
> As I had pointed out before, this draft describes two MPLS-based SFC >
> approaches: one is how to encode the NSH info, more specifically, the = SPI
>
> and SI info by two MPLS labels, which is still a stateful SFC mechanis= m
>
> just like NSH; another is how to leverage the MPLS-SR to realize a
>
> stateless SFC (see section 6).
>
>
>
> It has been pointed out by many people that section 6 of the draft cop= ies
>
> the
>
> idea of (https://tools.ietf.org/html/= draft-xu-mpls-service-chaining)
>
> without any technology contribution except replacing ?MPLS Segment
>
> Routing? by ?Label Stack?. Funnily, one author of draft-ietf-mpls-sfc<= br> >
> had inadvertently admitted
>
> "using a different name for the same thing is not so clever"= (see
>
> https://mailarchive.ietf.= org/arch/msg/mpls/y7FTc38ysVf6PyJlA04MEFSN9nc) in
>
> another thread.
>
>
>
> IMHO, the indulgence towards such behavior of copying
>
> ideas of existing drafts with word tricks would seriously trample
>
> underfoot the fairness and justice of the IETF culture. At least, it w= ould
>
> badly damage the interest and enthusiasm of IETF participants, especia= lly
>
> newcomers and non-native speakers of English.
>
>
>
> Best regards,
>
> Xiaohu
>
>
>
>
>
>
>
>
>
> *From: *mpls <mpls-bounces= @ietf.org> on behalf of Stewart Bryant <
> stewart.bryant@gmail.com>
> *Date: *Friday, April 13, 2018 at 3:10 AM
> *To: *"???(??)" <xiaohu.xxh@alibaba-inc.com>
> *Cc: *"mpls@ietf.org" &= lt;mpls@ietf.org>, mpls <mpls-bounces@ietf.org>,
> Robert Raszuk <robert@raszuk.n= et>, "sfc@ietf.org" &l= t;sfc@ietf.org>
> *Subject: *Re: [mpls] [sfc] Working Group adoption of
> draft-farrel-mpls-sfc
>
>
>
>
>
>
>
> On 13/04/2018 08:23, ???(??) wrote:
>
> Hi Stewart,
>
>
>
> Thanks for your response. For the SR-based SFC mechanism that has been=
> described in draft-xuclad*, it's not helpful to describe it again = in
> another draft. The most simple and efficient way to address the
> overlapping issue is to reference draft-xuclad* rather than
> "using a different name for the same thing". I'm looking= forward to
> seeing the revision of draft-farrel* that would address the overlappin= g
> issue concretely.
>
>
> Please read what I said.
>
> There are subtle but important technical differences between the two > approaches.
>
> - Stewart
>
>
>
>
> If co-authors of draft-farrel* believed the current text as described = in
> draft-xuclad* is not good enough or misses something important, any > comments and suggestions are more than welcome.
>
>
> I will send you some text to include in draft-xuclad that points to th= e
> important differences in the approach taken in draft-farrel. This will=
> clarify the issue to the reader.
>
> I hope that this is an acceptable resolution of this issue.
>
> - Stewart
>
>
>
>
>
> Best regards,
>
> Xiaohu
>
> ------------------------------------------------------------= ------
>
> Stewart Bryant <stewart= .bryant@gmail.com> <s= tewart.bryant@gmail.com>
>
> 2018?4?13?(???) 13:27
>
> ???(??) <xiaohu.xxh@a= libaba-inc.com> <xi= aohu.xxh@alibaba-inc.com>
>
> mpls <mpls-bounces@ietf.or= g> <mpls-bounces@ietf.or= g>; "Bernier, Daniel"
> <daniel.bernier@bell.ca> <daniel.bernier@bell.ca= >; Robert Raszuk
> <robert@raszuk.net> <= ;robert@raszuk.net>; mpls@ietf.org <mpls@ietf.org>
> <mpls@ietf.org>; sfc@ietf.org <= sfc@ietf.org> <sfc@ietf.org&g= t;
>
> Re: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc
>
>
>
> Hi Xiaohu
>
>
>
> What an earlier version of the draft said is of no importance. What it=
> says going forward is what counts.
>
>
>
> Perhaps the way to address your concern is to include some text of the=
> form that I used in my email of yesterday to describe to the reader th= e
> difference in approach. This is consistent with earlier advice in this=
> discussion to reference the work from which this forked.
>
>
>
> - Stewart
>
>
>
>
>
> Sent from my iPad
>
>
> On 13 Apr 2018, at 03:35, ???(??) <xiaohu.xxh@alibaba-inc.com> wrote:
>
> Hi Stewart,
>
>
>
> If draft-farrel* was just describing an MPLS-based SFC technology that= is
> different from the MPLS-SR-based SFC technology that has been describe= d in
> draft-xuclad*, that would be fine. However, draft-farrel* also describ= ed
> the technology that has been described in draft-xuclad* (see section 6= ) by
> "using a different name for the same thing". Note that the t= itle of
> section 6 in those pervious versions of draft-farrel* is
>
> "MPLS Segment Routing". One co-author of draft-farrel* said = they worked very hard to change the "Segment Routing" term to &qu= ot;label stack" term in the new version of draft-farrel* in order to d= eal with the overlapping issue. However, such change is just "using a = different name for the same thing", and it doesn't solve the overl= apping issue at all, as had been pointed out by many people. As said by one= co-author of draft-farrel*, in a thread which is irrelavant to this overla= pping issue, "using a different name for the same thing is not so clev= er:)". In fact, it would cause unneccessary confusions to implementors= by describing the same technology within different drafts. More badly, it = would set a bad precedant in the IETF of copying the idea of the existing d= raft by "using a different name for the same thing".
>
>
>
> Best regards,
>
> Xiaohu
>
> ------------------------------------------------------------= ------
>
> Stewart Bryant <stewart= .bryant@gmail.com>
>
> 2018?4?12?(???) 23:04
>
> "Bernier, Daniel" <daniel.bernier@bell.ca>; Robert Raszuk <
> robert@raszuk.net>
>
> mpls@ietf.org <mpls@ietf.org>; sf= c@ietf.org <sfc@ietf.org>
>
> Re: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc
>
>
>
>
> Rather than have a process discussion, I think we should go up a level=
> and better understand the technical differences between the two drafts= .
>
> draft-farrel-mpls-sfc describes the actions at a hop in terms of a tup= le
> that mirrors the SFC approach that allows a short indication of
> potentially re-entrant chains. In its simplest form it uses a compact<= br> > MPLS stack to describe an arbitarily complex path that is compatile wi= th
> simple edge routers which are often challenged in terms of the number = of
> labels that they can push.
>
> draft-xu-clad-spring-sr-service-chaining unrolls the path and exp= licitly
> calls out each hop and each function into the label stack. This result= s
> in a much larger MPLS label stack that will challenge some edge router= s.
> The way that we generally deal with imposition limits is through the u= se
> of binding-SIDs, which in the limiting case resolves to the approach i= n
> draft-farrel with the limitation that the position on the path is
> implicit in the label stack size rather than explicitly
> specified by the SI.
>
> Mid-flight path changes (if such things are needed) is clearly simpler=
> with draft-farrel.
>
> The short stack in draft-farrel comes at the cost of greater network > forwarding stack, and the long stack is the price that draft-xu-clad > pays for the reduction in forwarding state.
>
> The optimal design point between forwarding and control plane state is=
> something that is dependent on many parameters, and is dependent on ma= ny
> network and operational factors, so much so, that don't think it i= s wise
> to rule either out of scope at this stage.
>
> The hybrid mode in section 6 of draft-farrel supports the mixed mode i= n
> section 7 of the draft. This allows the construction of SFCs that are<= br> > the concatination of two or more compacted sub-chains. This allows the=
> operator to deploy a solution with the advantages of draft-farrel
> together with some of the flexibility of draft-xu-clad.
>
> At this stage the two drafts are sufficienly different that I think we=
> need to proceed with both at least to the point where we fully
> understand the detailed consequences of the two approachs and the
> scenarios where each finds it's niche.
>
> After developing a better understanding the detail of each design, the= ir
> control plane, and operational contexts and how each maps to customer<= br> > network requirements, we can move the drafts to the appropriate IETF > track. Such tracks may be anything from abandonment to IETF standard f= or
> one or both of these approaches.
>
> Meanwhile I think that we need to focus our efforts on a deeper
> understanding of the technology and how each might make the Internet > work better,=C2=A0 rather than spending effort on arguing about IETF p= rocess.
>
> - Stewart
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls >
>
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls >
>
>
>
>
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls >
>
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------------------------------

Subject: Digest Footer

_______________________________________________
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mpls@ietf.org
https://www.ietf.org/mailman/listinfo/mpls


------------------------------

End of mpls Digest, Vol 168, Issue 18
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--089e08e5931fa3ce44056a2f5d51-- From nobody Thu Apr 19 03:21:08 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1149B12D883; Thu, 19 Apr 2018 03:21:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 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, URIBL_BLOCKED=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 LyQSJ4QKvsQQ; Thu, 19 Apr 2018 03:21:01 -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 07A4A1241F8; Thu, 19 Apr 2018 03:21:01 -0700 (PDT) Received: from opfednr07.francetelecom.fr (unknown [xx.xx.xx.71]) by opfednr27.francetelecom.fr (ESMTP service) with ESMTP id 81E3CA0279; Thu, 19 Apr 2018 12:20:59 +0200 (CEST) Received: from Exchangemail-eme2.itn.ftgroup (unknown [xx.xx.31.69]) by opfednr07.francetelecom.fr (ESMTP service) with ESMTP id 59A231C007E; Thu, 19 Apr 2018 12:20:59 +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 14.03.0389.001; Thu, 19 Apr 2018 12:20:59 +0200 From: To: Lizhong Jin , "Andrew G. Malis" CC: "spring@ietf.org" , sfc , mpls Thread-Topic: [mpls] [sfc] Working Group adoption of draft-farrel-mpls-sfc Thread-Index: AQHT17iHKe5fFR3y70er5VNEbrWxpqQH2Q4Q Date: Thu, 19 Apr 2018 10:20:58 +0000 Message-ID: <18965_1524133259_5AD86D8B_18965_33_1_53C29892C857584299CBF5D05346208A47A22F7B@OPEXCLILM21.corporate.adroot.infra.ftgroup> References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.4] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A47A22F7BOPEXCLILM21corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [mpls] Working Group adoption of draft-farrel-mpls-sfc X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Apr 2018 10:21:06 -0000 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Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=herbertland-com.20150623.gappssmtp.com 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 Zisd_b41I-e6 for ; Thu, 19 Apr 2018 07:32:04 -0700 (PDT) Received: from mail-qk0-x229.google.com (mail-qk0-x229.google.com [IPv6:2607:f8b0:400d:c09::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 81EF212D869 for ; Thu, 19 Apr 2018 07:32:04 -0700 (PDT) Received: by mail-qk0-x229.google.com with SMTP id c136so5526237qkb.12 for ; Thu, 19 Apr 2018 07:32:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=herbertland-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=YU6FtJzS/wxHT8Q5ZE0NBCUx1GSBP0mnlv0dQTzrw8Y=; 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ALQs6tAfraN0PGt43X/vsCZj27hXrM3EBaEXvgI1lPJGz0fXkVhhq4A5 ClQP9bTjMMBf2xa31PKDS6T87nj01ziiFncHvqTWvg== X-Google-Smtp-Source: AIpwx48210XE5s1QdIQ48sV4qEzVr3VYOB35cxPSQVeOTUVE4TFNbDzb3B6BjL+fR6fAU2NPb8yK9my46pClwW+oPRY= X-Received: by 10.55.215.140 with SMTP id t12mr6508525qkt.148.1524148323218; Thu, 19 Apr 2018 07:32:03 -0700 (PDT) MIME-Version: 1.0 Received: by 10.237.48.35 with HTTP; Thu, 19 Apr 2018 07:32:02 -0700 (PDT) In-Reply-To: References: <8d1b3bb4a1794c4fac3455257e0ab60e@XCH-RCD-008.cisco.com> From: Tom Herbert Date: Thu, 19 Apr 2018 07:32:02 -0700 Message-ID: To: "Frank Brockners (fbrockne)" Cc: Tianran Zhou , "Shwetha Bhandari (shwethab)" , Mickey Spiegel , NVO3 , Service Function Chaining IETF list , IETF IPPM WG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Apr 2018 14:32:09 -0000 On Wed, Apr 18, 2018 at 12:51 AM, Frank Brockners (fbrockne) wrote: > Tom, > > inline... ("...FB") > > -----Original Message----- > From: Tom Herbert > Sent: Dienstag, 17. April 2018 16:23 > To: Frank Brockners (fbrockne) > Cc: Tianran Zhou ; Shwetha Bhandari (shwethab) ; Mickey Spiegel ; NVO3 ; Service Function Chaining IETF list ; IETF IPP= M WG > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various prot= ocols - follow up from WG discussion in London > > On Tue, Apr 17, 2018 at 12:51 AM, Frank Brockners (fbrockne) wrote: >> >> Hi Tianran, >> >> Tom's note already includes the hint: You'll add IOAM data to the protoc= ol/layer that you're interested in monitoring. Again using Geneve over IPv6= as an example: >> * If you're interested in the overlay, i.e. Geneve (e.g. timestamping >> the packet when it enters and exists the tunnel) - you'd add IOAM data >> to Geneve >> * If you're interested in the underlay, i.e. IPv6 (e.g. you'd like to >> understand which path packets take in the v6 network) - you'd add IOAM >> data to IPv6 >> * If you're interested in both, then you'd add IOAM data to Geneve and >> IPv6 >> > Frank, > > In that case why not just use a hop-by-hop option for measuring the under= lay and a destination option for measuring the overlay? The advantage is th= at this works _any_ IP encapsulation method or any IP protocol for that mat= ter. I don't believe adding ippm to every encapsulation protocol is straigh= tforward: e.g. > draft-brockners-ippm-ioam-geneve describe but notes the limited size of h= eader, draft-weis-ippm-ioam-gre states that a new EtherType would be needed= just for this purpose. This also entails additional encapsulation-specific= HW support also, whereas support destination and hbh options could be more= generic. > > ...FB: There are quite a few deployment examples, such as overlay VPN ser= vices, where you don't have access to the underlay (e.g. IPv6) - but do con= trol the overlay and desire insights into your overlay using IOAM. Hence th= e need carry IOAM data along the overlay encapsulation. > Frank, I'm not sure I follow your argument. Maybe examining some of the scenarios would help (here in in the draft): Consider that an end host sources a simple TCP packet. So headers look like IP | TCP If they wish to do ippm for end-to-end measure, a destination option can be used, so packet looks like IP | ippm_DO | TCP Similarly, if they want to do per hop measurement they that could also use and appropiate HBH option IP | ippm_HBH | ippm_DO | TCP Now consider that a device in the network is tunneling the packet with encapsulation. Basic encapsulated packet looks like IP | encap_hdr | IP | TCP Measurements across the tunnel (ingress to egress point) could be done IP | ippm_DO | encap_hdr | IP | TCP (#1) Measuring underday then would be IP | ippm_HBH | encap_hdr | IP | TCP And again both can be done simulataneously IP | ippm_HBH | ippm_DO | encap_hdr | IP | TCP Note also that in simple ipip encasulation the encap_hdr would be null when the DO EH hae next protocol as IP. So that case would look like: IP | ippm_HBH | ippm_DO | IP | TCP Now if the ippm is in the encapsulation, then to measure across the tunnel packet (ingress to egress) looks something like IP | encap_hdr | ippm_data | IP | TCP (#2) Where ippm_data is either a field or TLV of the encapsulation (like would be in Geneve) or it's a layer in a header chain (like in the GRE proposal). If underlay is also measured also then that gives IP | ippm_HBH | encap_hdr | ippm_data | IP | TCP ' #1 and #2 above are the comparable cases. #2 (ippm in the encapsulation) measures from encapsulation to decapsulation of the tunnel. This corresponds to the tunnel ingress and egress points. In #1, the DO is used to measure between tunnel ingress and egress. Processing of the encapsulation header is also done at tunnel ingress and egress so that coincides with where DO is processed. In an implementation, the destination option can even be passed the encpasulation layer if desired so that it can be processed as though it were part of the encapsulation. So from this, I don't see any functional difference between using the ippm DO in the outer IP header of an encapsulation and putting the ippm data in the encapsulation. There might be an agument that this is needed to support IPv4, but even so I'm not sure that justifies retrofitting every IETF defined encapsulation protocol to support ippm. Also, I think how ippm works with simple IPIP encapsulation should be thought out since that is still probably the most common encapsulation deployed. There is no way to extend IPIP (doesn't even have encap header) and adding a new IP protocol code point (similar to draft-weis-ippm-ioam-gre where a new EtherType for this purpose is proposed) is pretty unlikely to be accepted. So in this case of IPIP, it seems like the only answer is to use DO or HBH options, but as I mentioned I don't see that is any disadvantage or less functional of a solution (except for lacking IPv4 support). Tom > Frank > > Tom > >> Draft draft-ietf-ippm-ioam-data-02 already mentions layering (see sectio= n 3): >> "Layering: If several encapsulation protocols (e.g., in case of tunnelin= g) are stacked on top of each other, IOAM data-records could be present at = every layer. The behavior follows the ships-in-the-night model." >> >> Given the discussion here, we'll add some additional text in the next re= vision to make things crisper (e.g. adding an example might help). >> >> Frank >> >> -----Original Message----- >> From: Tianran Zhou >> Sent: Dienstag, 17. April 2018 03:18 >> To: Tom Herbert >> Cc: Shwetha Bhandari (shwethab) ; Frank Brockners >> (fbrockne) ; Mickey Spiegel >> ; NVO3 ; Service >> Function Chaining IETF list ; IETF IPPM WG >> >> Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various >> protocols - follow up from WG discussion in London >> >> I think it's better that Frank or Shwetha can explain the multi-layer us= e case in detail. >> >> Tianran >>> -----Original Message----- >>> From: Tom Herbert [mailto:tom@herbertland.com] >>> Sent: Monday, April 16, 2018 10:40 PM >>> To: Tianran Zhou >>> Cc: Shwetha Bhandari (shwethab) ; Frank Brockners >>> (fbrockne) ; Mickey Spiegel >>> ; NVO3 ; int-area >>> ; Service Function Chaining IETF list >>> ; IETF IPPM WG >>> Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various >>> protocols - follow up from WG discussion in London >>> >>> On Mon, Apr 16, 2018 at 6:31 AM, Tianran Zhou = wrote: >>> > Hi Shwetha, >>> > >>> > You are talking about the outer encapsution. It is straight forward >>> > for the underlay to record by the header. But what about the >>> > overlay, i.e., inner encapsulation(e.g. geneve)? Without special >>> > configuration, intermediate node will not read the inner header, >>> > hence not be able to process IOAM.e >>> >>> Hi Tianran, >>> >>> I believe that is also not protocol conformant. Intermediate nodes >>> should not be processing transport layer data as this can lead to >>> misinterpretation and possibly silent data corruption. >>> >>> For instance, Geneve is a UDP encapsulation protocol with assigned port= 6081. >>> In order for an intermediate device to process the Geneve >>> encapsulation header it would need to look for packets with >>> destination port of 6081 since that is the only possible >>> discriminator. However, transport port numbers do not have global >>> meaning and hosts may use port numbers for other purposes (RFC7605 >>> describes this). So a packet to port 6081 might be something other >>> than Geneve and may be misinterpreted. If a misinterpreted packet is ch= anged (like ippm data is written) then that would be systematic silent data= corruption. >>> >>> As far as I know, hop-by-hop options is the only protocol confirming >>> mechanism that allows an intermediate note to change data of packet in = flight. >>> Encpasulation is the only conforming mechanism that allows an >>> intermediate node to add data (like extension headers) to a packet in f= light. >>> >>> Tom >>> >>> > Maybe we are not synced by this overlay/underlay use case. :-) >>> > >>> > Tianran >>> > >>> > >>> > >>> > ________________________________ >>> > Sent from WeLink >>> > >>> > =E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A Shwetha Bhandari (shwethab) >>> > =E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A Tianran Zhou;Frank Brockners >>> > (fbrockne);Mickey >>> > Spiegel;Tom >>> > Herbert >>> > =E6=8A=84=E9=80=81=EF=BC=9A NVO3;int-area;Service >>> > Function Chaining IETF list;IETF IPPM >>> > WG >>> > =E4=B8=BB=E9=A2=98=EF=BC=9A Re: [ippm] [Int-area] encapsulation of IO= AM data in various >>> > protocols - follow up from WG discussion in London >>> > =E6=97=B6=E9=97=B4=EF=BC=9A 2018-04-16 18:17:01 >>> > >>> > Hi Tianran, >>> > >>> >> If I recall right, it is not written in the ioam data draft. >>> > >>> > Data draft is defining the data to be carried in IOAM in an >>> > encapsulation agnostic way, it does not specify how the >>> > encapsulation protocol is configured. >>> > >>> > >>> > >>> >> Yes, node by node configuration is an easy way. >>> > >>> > While it is, it does not have to be a node by node configuration. >>> > It can be part of the encapsulation definition. >>> > >>> > For e.g. If the encapsulation is IPv6 and if we define the data to >>> > be carried as HbH options, then based on the Option Type with >>> > highest order 2 bits set to 00 then the v6 nodes that implement >>> > IOAM will process the option and others will skip over. >>> > >>> > >>> > >>> > >>> > >>> > Thanks, >>> > >>> > Shwetha >>> > >>> > >>> > >>> > From: ippm on behalf of Tianran Zhou >>> > >>> > Date: Monday, April 16, 2018 at 2:36 PM >>> > To: "Frank Brockners (fbrockne)" , Mickey >>> > Spiegel , Tom Herbert >>> > >>> > Cc: NVO3 , "int-area@ietf.org" , >>> > Service Function Chaining IETF list , IETF IPPM WG >>> > >>> > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in >>> > various protocols - follow up from WG discussion in London >>> > >>> > >>> > >>> > Hi Frank, >>> > >>> > >>> > >>> > If I recall right, it is not written in the ioam data draft. >>> > >>> > Yes, node by node configuration is an easy way. In the >>> > draft-zhou-ippm-ioam-yang, we have the =E2=80=9Cprotocol-type=E2=80= =9D to indicate >>> > the layering. >>> > >>> > +--rw ioam >>> > >>> > +--rw ioam-profiles >>> > >>> > +--rw enabled? boolean >>> > >>> > +--rw ioam-profile* [profile-name] >>> > >>> > +--rw profile-name string >>> > >>> > +--rw filter >>> > >>> > | +--rw filter-type? ioam-filter-type >>> > >>> > | +--rw acl-name? -> /acl:acls/acl/name >>> > >>> > +--rw protocol-type? ioam-protocol-type >>> > >>> > +--rw incremental-tracing-profile {incremental-trace}? >>> > >>> > | ... >>> > >>> > +--rw preallocated-tracing-profile {preallocated-trace}? >>> > >>> > | ... >>> > >>> > +--rw pot-profile {proof-of-transit}? >>> > >>> > | ... >>> > >>> > +--rw e2e-profile {edge-to-edge}? >>> > >>> > ... >>> > >>> > >>> > >>> > >>> > >>> > Tianran >>> > >>> > From: Frank Brockners (fbrockne) [mailto:fbrockne@cisco.com] >>> > Sent: Monday, April 16, 2018 4:51 PM >>> > To: Tianran Zhou ; Mickey Spiegel >>> > ; Tom Herbert >>> > Cc: NVO3 ; int-area@ietf.org; Service Function >>> > Chaining IETF list ; IETF IPPM WG >>> > Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in >>> > various protocols - follow up from WG discussion in London >>> > >>> > >>> > >>> > Hi Tianran, >>> > >>> > >>> > >>> > IOAM is a domain specific feature (see also >>> > draft-ietf-ippm-ioam-data-02 sections 3 and 4), which allows an >>> > operator to control by means of configuration where and for which >>> > traffic IOAM data fields are added/updated/removed from the >>> > customer traffic. Using your example of Geneve over IPv6 =E2=80=93 wi= th >>> > IOAM data in both the Geneve and the IPv6 protocol, one would >>> > expect that the operator configures the endpoints of the Geneve >>> > tunnel to operate on the IOAM data in Geneve, and the IPv6 routers >>> > that the Geneve tunnel >>> traverses to operate on the IOAM data in IPv6. >>> > >>> > >>> > >>> > Frank >>> > >>> > >>> > >>> > From: Tianran Zhou >>> > Sent: Montag, 16. April 2018 10:37 >>> > To: Frank Brockners (fbrockne) ; Mickey Spiegel >>> > ; Tom Herbert >>> > Cc: NVO3 ; int-area@ietf.org; Service Function >>> > Chaining IETF list ; IETF IPPM WG >>> > Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in >>> > various protocols - follow up from WG discussion in London >>> > >>> > >>> > >>> > Hi Frank, >>> > >>> > >>> > >>> > How does a forwarder know when and where to insert the data? >>> > >>> > In the case of Geneve over IPv6, do you mean the device need to >>> > scan all the protocol stack? Or just the outer encapsulation? >>> > >>> > >>> > >>> > Tianran >>> > >>> > >>> > >>> > From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Frank >>> > Brockners >>> > (fbrockne) >>> > Sent: Monday, April 16, 2018 3:08 PM >>> > To: Mickey Spiegel ; Tom Herbert >>> > >>> > Cc: NVO3 ; int-area@ietf.org; Service Function >>> > Chaining IETF list ; IETF IPPM WG >>> > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in >>> > various protocols - follow up from WG discussion in London >>> > >>> > >>> > >>> > >>> > >>> > Tom, >>> > >>> > >>> > >>> > a quick addition to what Mickey mentioned below: What you seem to >>> > have in mind is what draft-ietf-ippm-ioam-data-02 refers to as =E2=80= =9Clayering=E2=80=9D >>> > (see section 3.), i.e. if you=E2=80=99re running for example Geneve o= ver >>> > IPv6, then IOAM data could be encapsulated in both protocols, >>> > Geneve and >>> > IPv6 =E2=80=93 giving you visibility into the =E2=80=9Cunderlay=E2=80= =9D (IPv6) and the =E2=80=9Coverlay=E2=80=9D >>> (Geneve). >>> > >>> > >>> > >>> > Frank >>> > >>> > >>> > >>> > From: ippm On Behalf Of Mickey Spiegel >>> > Sent: Freitag, 13. April 2018 20:22 >>> > To: Tom Herbert >>> > Cc: NVO3 ; int-area@ietf.org; Service Function >>> > Chaining IETF list ; IETF IPPM WG >>> > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in >>> > various protocols - follow up from WG discussion in London >>> > >>> > >>> > >>> > Tom, >>> > >>> > >>> > >>> > On Thu, Apr 12, 2018 at 10:17 PM, Tom Herbert w= rote: >>> > >>> > Mickey, >>> > >>> > Looking at these ippm drafts more closely, I have a much more >>> > fundamental concern. >>> > >>> > In draft-brockners-ippm-ioam-geneve-00 for instance, there is the >>> > text in the introduction: >>> > >>> > "In-situ OAM (IOAM) records OAM information within the packet while >>> > the packet traverses a particular network domain. The term "in-situ" >>> > refers to the fact that the IOAM data fields are added to the data >>> > packets rather than is being sent within packets specifically >>> > dedicated to OAM. This document defines how IOAM data fields are >>> > transported as part of the Geneve [I-D.ietf-nvo3-geneve] >>> > encapsulation." >>> > >>> > I assume this means that as packets with Geneve encapsulation >>> > traverse the network they are interpreted by intermediate nodes as >>> > being Geneve. Since Geneve is a UDP encapsulation, then the >>> > destination UDP port number would be used to identify packets as >>> > being Geneve. So an intermediate device might be looking for UDP >>> > packets destined to port >>> > 6081 (the assigned UDP port for Geneve). If my understanding is >>> > correct, then this is a problem. >>> > >>> > UDP port numbers do not have global meaning. An intermediate device >>> > may very well see UDP packets destined to port 6081 that are not >>> > actually Geneve. This scenario is discussed in RFC7605: >>> > >>> > "...intermediate device interprets traffic based on the port number. >>> > It is important to recognize that any interpretation of port >>> > numbers >>> > -- except at the endpoints -- may be incorrect, because port >>> > numbers are meaningful only at the endpoints." >>> > >>> > If the UDP data is modified, as the draft would imply, then >>> > misinterpretation may also mean silent data corruption of packets. >>> > A protocol that would allow this seems pretty incorrect! Note that >>> > this would be true also for any UDP encapsulation that the network >>> > tries to interpret. >>> > >>> > >>> > >>> > The intention is to allow for multiple nodes that a packet >>> > traverses >>> > >>> > to be able to insert IOAM node information in the same trace >>> > option, >>> > >>> > but leave some flexibility regarding which nodes actually do the >>> > >>> > IOAM processing and the node information. This may vary >>> > >>> > depending on the transport. >>> > >>> > >>> > >>> > In case of a tunneled encapsulation such as Geneve or VXLAN, >>> > >>> > there may still be multiple hops. For example a network may use >>> > >>> > Geneve or VXLAN, but only do L2 processing at ToRs, with L3 >>> > >>> > processing done at aggregation or core switches. In this case >>> > >>> > many packets would do 2 Geneve or VXLAN hops, so the packet >>> > >>> > would contain IOAM node information from two nodes. >>> > >>> > >>> > >>> > Another example is service function chaining using Geneve or >>> > >>> > VXLAN rather than NSH. >>> > >>> > >>> > >>> > >>> > I am also wondering if hop-by-hop options been considered for this >>> > application? Their interpretation in the network is unabiguous and >>> > they also have the advantage that the work with any IP protocol or >>> > encapsulation. >>> > >>> > >>> > >>> > IPv6 hop-by-hop options has been considered. See >>> > >>> > draft-brockners-inband-oam-transport-05. This has not yet been >>> > >>> > broken out into a separate draft. >>> > >>> > >>> > >>> > Mickey >>> > >>> > >>> > >>> > >>> > Thanks, >>> > Tom >>> > >>> > >>> > On Thu, Apr 12, 2018 at 3:31 PM, Mickey Spiegel >>> > wrote: >>> > >>> >> Tom, >>> >> >>> >> On Thu, Apr 12, 2018 at 2:46 PM, Tom Herbert w= rote: >>> >>> >>> >>> On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky >>> >>> >>> >>> wrote: >>> >>> > Hi Frank, >>> >>> > thank you for sharing your points. Please find my notes in-line >>> >>> > and tagged >>> >>> > GIM>>. I believe that this is very much relevant to work of >>> >>> > GIM>>other >>> >>> > working >>> >>> > groups that directly work on the overlay encapsulations in the >>> >>> > center of the discussion and hence I've added them to the list. >>> >>> > Hope we'll have more opinions to reach the conclusion that is >>> >>> > acceptable to all. >>> >>> > >>> >>> > Regards, >>> >>> > Greg >>> >>> > >>> >>> > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) >>> >>> > wrote: >>> >>> >> >>> >>> >> Back at the IPPM meeting in London, we discussed several >>> >>> >> drafts dealing with the encapsulation of IOAM data in various >>> >>> >> protocols (draft-brockners-ippm-ioam-vxlan-gpe-00, >>> >>> >> draft-brockners-ippm-ioam-geneve-00, >>> >>> >> draft-weis-ippm-ioam-gre-00). One discussion topic that we >>> >>> >> decided to take to the list was the question on whether >>> >>> >> draft-ooamdt-rtgwg-ooam-header could be leveraged.. After >>> >>> >> carefully considering draft-ooamdt-rtgwg-ooam-header, I came >>> >>> >> to the conclusion that the =E2=80=9COOAM header=E2=80=9D does no= t meet the >>> >>> >> needs of >>> >>> >> IOAM: >>> >>> >> >>> >>> >> * Efficiency: IOAM adds data to live user traffic. As such, an >>> >>> >> encapsulation needs to be as efficient as possible. The =E2=80= =9COOAM header=E2=80=9D >>> >>> >> is 8 >>> >>> >> bytes long. The approach for IOAM data encapsulation in the >>> >>> >> above mentioned drafts only requires 4 bytes. Using the OOAM >>> >>> >> header approach would add an unnecessary overhead of 4 bytes =E2= =80=93 >>> >>> >> which is significant. >>> >>> Greg, >>> >>> >>> >>> I'm missing something here. I looked at the drafts you referenced >>> >>> and each of them looks like the overhead for OAM is greater that >>> >>> four bytes. In each there is some overhead equivalent to >>> >>> type/length, for instance in Geneve four bytes are needed for >>> >>> option class, type, and length. Unless the the OAM data is zero >>> >>> length, I don't see how this adds up to only four bytes of overhead= . >>> >> >>> >> >>> >> The four versus eight bytes just refers to the fields in the four >>> >> bytes of IOAM info, that is common to all IOAM options. Beyond >>> >> that, there are IOAM option specific fields. For example if doing >>> >> one of the IOAM trace options, there are four bytes of trace >>> >> option header, including the IOAM-trace-type, NodeLen, Flags, and >>> >> RemainingLen fields. These are followed by the node data list >>> >> containing the per hop IOAM information. >>> >> >>> >> In looking at the OOAM header content, it has nothing to do with >>> >> any of the IOAM information after the first four bytes. It >>> >> contains another variant of the information in the first four >>> >> bytes of IOAM info, spread out over eight bytes. >>> >> >>> >>> >>> >>> Tom >>> >>> >>> >>> > >>> >>> > GIM>> The difference in four octets is because OOAM Header: >>> >>> > >>> >>> > provides more flexibility, e.g. Flags field and Reserved >>> >>> > fields; >>> >> >>> >> >>> >> The flags field only has one defined flag at the moment, for a >>> >> timestamp block. For IOAM trace we need per hop timestamps, which >>> >> the timestamp block cannot address, i.e. the timestamp block is >>> >> redundant for >>> IOAM. >>> >> >>> >>> >>> >>> > supports larger OAM packets than iOAM header; >>> >> >>> >> >>> >> For IOAM purposes, 1020 octets is more than enough. >>> >> >>> >>> >>> >>> > is future proof by supporting versioning (Version field). >>> >> >>> >> >>> >> IMO, taking the first two bits of the IOAM-Type to define a >>> >> Version field would be a good thing. This does not require adding >>> >> four more bytes of overhead. 64 IOAM-Types is more than enough. >>> >> >>> >>> >>> >>> >> >>> >>> >> * Maturity: IOAM has several implementations, which were also >>> >>> >> shown at recent IETF hackathons =E2=80=93 and we=E2=80=99re expe= cting >>> >>> >> additional implementations to be publicized soon. >>> >>> >> Interoperable implementations need timely specifications. >>> >>> >> Despite the question being asked, the recent thread on OOAM in >>> >>> >> the NVO3 list hasn=E2=80=99t revealed any implementation of the = OOAM header. >>> >>> >> In >>> >>> >> addition, the thread revealed that several fundamental >>> >>> >> questions about the OOAM header are still open, such as >>> >>> >> whether or how active OAM mechanisms within protocols such as >>> >>> >> Geneve would apply to the OOAM header. This ultimately means >>> >>> >> that we won=E2=80=99t get to a timely specification. >>> >>> > >>> >>> > GIM>> May I ask which encapsulations supported by the >>> >>> > GIM>> implementations >>> >>> > you >>> >>> > refer to. Until very recently all iOAM proposals were to use >>> >>> > meta-data TLV in, e.g. Geneve and NSH. And if these or some of >>> >>> > these implementations already updated to the newly proposed >>> >>> > iOAM shim, I don't see problem in making them use OOAM Header. >>> >>> > Would you agree? >>> >>> > >>> >>> >> >>> >>> >> * Scope: It isn=E2=80=99t entirely clear to which protocols the = OOAM >>> >>> >> header would ultimately apply to. The way the OOAM header is >>> >>> >> defined, OOAM uses a 8-bit field for =E2=80=9CNext Prot=E2=80=9D= , the next >>> >>> >> protocol. Some protocols that IOAM data needs to be >>> >>> >> encapsulated into use 16-bits for their next protocol code point= s. See e.g. >>> >>> >> the GRE encapsulation =E2=80=93 as specified in >>> >>> >> draft-weis-ippm-ioam-gre-00. >>> >>> > >>> >>> > GIM>> The first paragraph of the Introduction section states: >>> >>> > New protocols that support overlay networks like VxLAN-GPE >>> >>> > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve >>> >>> > [I-D.ietf-nvo3-geneve], BIER >>> >>> > [I-D.ietf-bier-mpls-encapsulation], >>> and >>> >>> > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. >>> >>> > Ethernet, IPv4/IPv6, and recognize Operations, Administration,= and >>> >>> > Maintenance (OAM) as one of distinct types. That ensures that >>> >>> > Overlay OAM (OOAM)packets are sharing fate with Overlay data p= acket >>> >>> > traversing the underlay. >>> >>> > I'm updating the OOAM Header draft and along with cleaning nits >>> >>> > will update reference to GUE. I think that the list and the >>> >>> > statemnt are quite clear in identifying the scope of networks >>> >>> > that may benefit from using not only common OOAM Header but >>> >>> > common OOAM mechanisms, e.g. Echo Request/Reply. >>> >>> > >>> >>> >> With the above in mind, I=E2=80=99d suggest that the WG moves fo= rward >>> >>> >> with specific definitions for encapsulating IOAM data into >>> >>> >> protocols =E2=80=93 per the above mentioned drafts. >>> >>> >> >>> >>> >> >>> >>> >> >>> >>> >> Regards, Frank >>> >>> >> >>> >>> >> >>> >>> >> _______________________________________________ >>> >>> >> ippm mailing list >>> >>> >> ippm@ietf.org >>> >>> >> https://www.ietf.org/mailman/listinfo/ippm >>> >>> >> >>> >>> > >>> >>> > >>> >>> > _______________________________________________ >>> >>> > Int-area mailing list >>> >>> > Int-area@ietf.org >>> >>> > https://www.ietf.org/mailman/listinfo/int-area >>> >>> > >>> >>> >>> >>> _______________________________________________ >>> >>> ippm 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([173.37.102.18]) by XCH-RCD-008.cisco.com ([173.37.102.18]) with mapi id 15.00.1320.000; Thu, 19 Apr 2018 09:47:11 -0500 From: "Frank Brockners (fbrockne)" To: Tom Herbert CC: Tianran Zhou , "Shwetha Bhandari (shwethab)" , Mickey Spiegel , NVO3 , Service Function Chaining IETF list , "IETF IPPM WG" Thread-Topic: [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AQHT01Rv7uw9TGdqO0+V2HJ61OA6MaQC+nQwgABu/4D//63XQIAAWkqAgAATngCAADaJgIAAEx0AgACyKYCAABh5EIAAwsqAgADPxZCAAld8AP//r8sA Date: Thu, 19 Apr 2018 14:47:10 +0000 Message-ID: <25f25dee271a47268cf63982e8d7135c@XCH-RCD-008.cisco.com> References: <8d1b3bb4a1794c4fac3455257e0ab60e@XCH-RCD-008.cisco.com> In-Reply-To: Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.55.117.3] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Apr 2018 14:47:19 -0000 VG9tLA0KDQotLS0tLU9yaWdpbmFsIE1lc3NhZ2UtLS0tLQ0KRnJvbTogVG9tIEhlcmJlcnQgPHRv bUBoZXJiZXJ0bGFuZC5jb20+IA0KU2VudDogRG9ubmVyc3RhZywgMTkuIEFwcmlsIDIwMTggMTY6 MzINClRvOiBGcmFuayBCcm9ja25lcnMgKGZicm9ja25lKSA8ZmJyb2NrbmVAY2lzY28uY29tPg0K Q2M6IFRpYW5yYW4gWmhvdSA8emhvdXRpYW5yYW5AaHVhd2VpLmNvbT47IFNod2V0aGEgQmhhbmRh cmkgKHNod2V0aGFiKSA8c2h3ZXRoYWJAY2lzY28uY29tPjsgTWlja2V5IFNwaWVnZWwgPG1zcGll Z2VsQGJhcmVmb290bmV0d29ya3MuY29tPjsgTlZPMyA8bnZvM0BpZXRmLm9yZz47IFNlcnZpY2Ug RnVuY3Rpb24gQ2hhaW5pbmcgSUVURiBsaXN0IDxzZmNAaWV0Zi5vcmc+OyBJRVRGIElQUE0gV0cg 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<25f25dee271a47268cf63982e8d7135c@XCH-RCD-008.cisco.com> References: <8d1b3bb4a1794c4fac3455257e0ab60e@XCH-RCD-008.cisco.com> <25f25dee271a47268cf63982e8d7135c@XCH-RCD-008.cisco.com> From: Tom Herbert Date: Thu, 19 Apr 2018 08:43:32 -0700 Message-ID: To: "Frank Brockners (fbrockne)" Cc: Tianran Zhou , "Shwetha Bhandari (shwethab)" , Mickey Spiegel , NVO3 , Service Function Chaining IETF list , IETF IPPM WG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Apr 2018 15:43:45 -0000 On Thu, Apr 19, 2018 at 7:47 AM, Frank Brockners (fbrockne) wrote: > Tom, > > -----Original Message----- > From: Tom Herbert > Sent: Donnerstag, 19. April 2018 16:32 > To: Frank Brockners (fbrockne) > Cc: Tianran Zhou ; Shwetha Bhandari (shwethab) ; Mickey Spiegel ; NVO3 ; Service Function Chaining IETF list ; IETF IPP= M WG > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various prot= ocols - follow up from WG discussion in London > > On Wed, Apr 18, 2018 at 12:51 AM, Frank Brockners (fbrockne) wrote: >> Tom, >> >> inline... ("...FB") >> >> -----Original Message----- >> From: Tom Herbert >> Sent: Dienstag, 17. April 2018 16:23 >> To: Frank Brockners (fbrockne) >> Cc: Tianran Zhou ; Shwetha Bhandari (shwethab) >> ; Mickey Spiegel ; >> NVO3 ; Service Function Chaining IETF list >> ; IETF IPPM WG >> Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various >> protocols - follow up from WG discussion in London >> >> On Tue, Apr 17, 2018 at 12:51 AM, Frank Brockners (fbrockne) wrote: >>> >>> Hi Tianran, >>> >>> Tom's note already includes the hint: You'll add IOAM data to the proto= col/layer that you're interested in monitoring. Again using Geneve over IPv= 6 as an example: >>> * If you're interested in the overlay, i.e. Geneve (e.g. timestamping >>> the packet when it enters and exists the tunnel) - you'd add IOAM >>> data to Geneve >>> * If you're interested in the underlay, i.e. IPv6 (e.g. you'd like to >>> understand which path packets take in the v6 network) - you'd add >>> IOAM data to IPv6 >>> * If you're interested in both, then you'd add IOAM data to Geneve >>> and >>> IPv6 >>> >> Frank, >> >> In that case why not just use a hop-by-hop option for measuring the unde= rlay and a destination option for measuring the overlay? The advantage is t= hat this works _any_ IP encapsulation method or any IP protocol for that ma= tter. I don't believe adding ippm to every encapsulation protocol is straig= htforward: e.g. >> draft-brockners-ippm-ioam-geneve describe but notes the limited size of = header, draft-weis-ippm-ioam-gre states that a new EtherType would be neede= d just for this purpose. This also entails additional encapsulation-specifi= c HW support also, whereas support destination and hbh options could be mor= e generic. >> >> ...FB: There are quite a few deployment examples, such as overlay VPN se= rvices, where you don't have access to the underlay (e.g. IPv6) - but do co= ntrol the overlay and desire insights into your overlay using IOAM. Hence t= he need carry IOAM data along the overlay encapsulation. >> > Frank, > > I'm not sure I follow your argument. Maybe examining some of the scenario= s would help (here in in the draft): > > Consider that an end host sources a simple TCP packet. So headers look li= ke > > IP | TCP > > If they wish to do ippm for end-to-end measure, a destination option can = be used, so packet looks like > > IP | ippm_DO | TCP > > Similarly, if they want to do per hop measurement they that could also us= e and appropiate HBH option > > IP | ippm_HBH | ippm_DO | TCP > > Now consider that a device in the network is tunneling the packet with en= capsulation. > > Basic encapsulated packet looks like > > IP | encap_hdr | IP | TCP > > Measurements across the tunnel (ingress to egress point) could be done > > IP | ippm_DO | encap_hdr | IP | TCP (#1) > > Measuring underday then would be > > IP | ippm_HBH | encap_hdr | IP | TCP > > And again both can be done simulataneously > > IP | ippm_HBH | ippm_DO | encap_hdr | IP | TCP > > Note also that in simple ipip encasulation the encap_hdr would be null wh= en the DO EH hae next protocol as IP. So that case would look like: > > IP | ippm_HBH | ippm_DO | IP | TCP > > Now if the ippm is in the encapsulation, then to measure across the tunne= l packet (ingress to egress) looks something like > > IP | encap_hdr | ippm_data | IP | TCP (#2) > > Where ippm_data is either a field or TLV of the encapsulation (like would= be in Geneve) or it's a layer in a header chain (like in the GRE proposal)= . > > If underlay is also measured also then that gives > > IP | ippm_HBH | encap_hdr | ippm_data | IP | TCP ' > #1 and #2 above are the comparable cases. > > #2 (ippm in the encapsulation) measures from encapsulation to decapsulati= on of the tunnel. This corresponds to the tunnel ingress and egress points.= In #1, the DO is used to measure between tunnel ingress and egress. Proces= sing of the encapsulation header is also done at tunnel ingress and egress = so that coincides with where DO is processed. In an implementation, the des= tination option can even be passed the encpasulation layer if desired so th= at it can be processed as though it were part of the encapsulation. > > So from this, I don't see any functional difference between using the ipp= m DO in the outer IP header of an encapsulation and putting the ippm data i= n the encapsulation. There might be an agument that this is needed to suppo= rt IPv4, but even so I'm not sure that justifies retrofitting every IETF de= fined encapsulation protocol to support ippm. > > Also, I think how ippm works with simple IPIP encapsulation should be tho= ught out since that is still probably the most common encapsulation deploye= d. There is no way to extend IPIP (doesn't even have encap > header) and adding a new IP protocol code point (similar to draft-weis-ip= pm-ioam-gre where a new EtherType for this purpose is > proposed) is pretty unlikely to be accepted. So in this case of IPIP, it = seems like the only answer is to use DO or HBH options, but as I mentioned = I don't see that is any disadvantage or less functional of a solution (exce= pt for lacking IPv4 support). > > ...FB: Thanks. I do follow your logic, though ignoring v4 isn't really an= option - hence the need to get IOAM data into the tunnel encaps - at least= into the most popular ones. > Frank, It's not a matter of ignoring IPv4, it's that IPv4 doesn't have the capabilities that seem to be needed. Unless the intent is to resurrect IPv4 options, there is no way to add ippm to IP packets other than by encapsulation. That means that the cases I listed above that don't involve encapsulation don't exist in IPv4. Also, again assuming IPv4 options are off the table, there is no way in IPv4 to perform ippm hop-by-hop measurement since there is no allowance in IP that intermediate devices can change IP payloads (see the UDP port number misinterpretation problem for example). Maybe it's time to sunset IPv4 :-) As for "popular encapsulations", I still don't see any feasible way to extend IPIP for ippm. Also, I believe the attempt to make GRE extensible as described in draft-weis-ippm-ioam-gre is problematic in several ways-- I will send comments on that draft. Tom > Frank > > Tom > >> Frank >> >> Tom >> >>> Draft draft-ietf-ippm-ioam-data-02 already mentions layering (see secti= on 3): >>> "Layering: If several encapsulation protocols (e.g., in case of tunneli= ng) are stacked on top of each other, IOAM data-records could be present at= every layer. The behavior follows the ships-in-the-night model." >>> >>> Given the discussion here, we'll add some additional text in the next r= evision to make things crisper (e.g. adding an example might help). >>> >>> Frank >>> >>> -----Original Message----- >>> From: Tianran Zhou >>> Sent: Dienstag, 17. April 2018 03:18 >>> To: Tom Herbert >>> Cc: Shwetha Bhandari (shwethab) ; Frank Brockners >>> (fbrockne) ; Mickey Spiegel >>> ; NVO3 ; Service >>> Function Chaining IETF list ; IETF IPPM WG >>> >>> Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various >>> protocols - follow up from WG discussion in London >>> >>> I think it's better that Frank or Shwetha can explain the multi-layer u= se case in detail. >>> >>> Tianran >>>> -----Original Message----- >>>> From: Tom Herbert [mailto:tom@herbertland.com] >>>> Sent: Monday, April 16, 2018 10:40 PM >>>> To: Tianran Zhou >>>> Cc: Shwetha Bhandari (shwethab) ; Frank >>>> Brockners >>>> (fbrockne) ; Mickey Spiegel >>>> ; NVO3 ; int-area >>>> ; Service Function Chaining IETF list >>>> ; IETF IPPM WG >>>> Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various >>>> protocols - follow up from WG discussion in London >>>> >>>> On Mon, Apr 16, 2018 at 6:31 AM, Tianran Zhou = wrote: >>>> > Hi Shwetha, >>>> > >>>> > You are talking about the outer encapsution. It is straight >>>> > forward for the underlay to record by the header. But what about >>>> > the overlay, i.e., inner encapsulation(e.g. geneve)? Without >>>> > special configuration, intermediate node will not read the inner >>>> > header, hence not be able to process IOAM.e >>>> >>>> Hi Tianran, >>>> >>>> I believe that is also not protocol conformant. Intermediate nodes >>>> should not be processing transport layer data as this can lead to >>>> misinterpretation and possibly silent data corruption. >>>> >>>> For instance, Geneve is a UDP encapsulation protocol with assigned por= t 6081. >>>> In order for an intermediate device to process the Geneve >>>> encapsulation header it would need to look for packets with >>>> destination port of 6081 since that is the only possible >>>> discriminator. However, transport port numbers do not have global >>>> meaning and hosts may use port numbers for other purposes (RFC7605 >>>> describes this). So a packet to port 6081 might be something other >>>> than Geneve and may be misinterpreted. If a misinterpreted packet is c= hanged (like ippm data is written) then that would be systematic silent dat= a corruption. >>>> >>>> As far as I know, hop-by-hop options is the only protocol confirming >>>> mechanism that allows an intermediate note to change data of packet in= flight. >>>> Encpasulation is the only conforming mechanism that allows an >>>> intermediate node to add data (like extension headers) to a packet in = flight. >>>> >>>> Tom >>>> >>>> > Maybe we are not synced by this overlay/underlay use case. :-) >>>> > >>>> > Tianran >>>> > >>>> > >>>> > >>>> > ________________________________ >>>> > Sent from WeLink >>>> > >>>> > =E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A Shwetha Bhandari (shwethab) >>>> > =E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A Tianran Zhou;Frank Brockners >>>> > (fbrockne);Mickey >>>> > Spiegel;Tom >>>> > Herbert >>>> > =E6=8A=84=E9=80=81=EF=BC=9A NVO3;int-area;Service >>>> > Function Chaining IETF list;IETF IPPM >>>> > WG >>>> > =E4=B8=BB=E9=A2=98=EF=BC=9A Re: [ippm] [Int-area] encapsulation of I= OAM data in various >>>> > protocols - follow up from WG discussion in London >>>> > =E6=97=B6=E9=97=B4=EF=BC=9A 2018-04-16 18:17:01 >>>> > >>>> > Hi Tianran, >>>> > >>>> >> If I recall right, it is not written in the ioam data draft. >>>> > >>>> > Data draft is defining the data to be carried in IOAM in an >>>> > encapsulation agnostic way, it does not specify how the >>>> > encapsulation protocol is configured. >>>> > >>>> > >>>> > >>>> >> Yes, node by node configuration is an easy way. >>>> > >>>> > While it is, it does not have to be a node by node configuration. >>>> > It can be part of the encapsulation definition. >>>> > >>>> > For e.g. If the encapsulation is IPv6 and if we define the data to >>>> > be carried as HbH options, then based on the Option Type with >>>> > highest order 2 bits set to 00 then the v6 nodes that implement >>>> > IOAM will process the option and others will skip over. >>>> > >>>> > >>>> > >>>> > >>>> > >>>> > Thanks, >>>> > >>>> > Shwetha >>>> > >>>> > >>>> > >>>> > From: ippm on behalf of Tianran Zhou >>>> > >>>> > Date: Monday, April 16, 2018 at 2:36 PM >>>> > To: "Frank Brockners (fbrockne)" , Mickey >>>> > Spiegel , Tom Herbert >>>> > >>>> > Cc: NVO3 , "int-area@ietf.org" , >>>> > Service Function Chaining IETF list , IETF IPPM WG >>>> > >>>> > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in >>>> > various protocols - follow up from WG discussion in London >>>> > >>>> > >>>> > >>>> > Hi Frank, >>>> > >>>> > >>>> > >>>> > If I recall right, it is not written in the ioam data draft. >>>> > >>>> > Yes, node by node configuration is an easy way. In the >>>> > draft-zhou-ippm-ioam-yang, we have the =E2=80=9Cprotocol-type=E2=80= =9D to indicate >>>> > the layering. >>>> > >>>> > +--rw ioam >>>> > >>>> > +--rw ioam-profiles >>>> > >>>> > +--rw enabled? boolean >>>> > >>>> > +--rw ioam-profile* [profile-name] >>>> > >>>> > +--rw profile-name string >>>> > >>>> > +--rw filter >>>> > >>>> > | +--rw filter-type? ioam-filter-type >>>> > >>>> > | +--rw acl-name? -> /acl:acls/acl/name >>>> > >>>> > +--rw protocol-type? ioam-protocol-type >>>> > >>>> > +--rw incremental-tracing-profile {incremental-trace}? >>>> > >>>> > | ... >>>> > >>>> > +--rw preallocated-tracing-profile {preallocated-trace}? >>>> > >>>> > | ... >>>> > >>>> > +--rw pot-profile {proof-of-transit}? >>>> > >>>> > | ... >>>> > >>>> > +--rw e2e-profile {edge-to-edge}? >>>> > >>>> > ... >>>> > >>>> > >>>> > >>>> > >>>> > >>>> > Tianran >>>> > >>>> > From: Frank Brockners (fbrockne) [mailto:fbrockne@cisco.com] >>>> > Sent: Monday, April 16, 2018 4:51 PM >>>> > To: Tianran Zhou ; Mickey Spiegel >>>> > ; Tom Herbert >>>> > Cc: NVO3 ; int-area@ietf.org; Service Function >>>> > Chaining IETF list ; IETF IPPM WG >>>> > Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in >>>> > various protocols - follow up from WG discussion in London >>>> > >>>> > >>>> > >>>> > Hi Tianran, >>>> > >>>> > >>>> > >>>> > IOAM is a domain specific feature (see also >>>> > draft-ietf-ippm-ioam-data-02 sections 3 and 4), which allows an >>>> > operator to control by means of configuration where and for which >>>> > traffic IOAM data fields are added/updated/removed from the >>>> > customer traffic. Using your example of Geneve over IPv6 =E2=80=93 w= ith >>>> > IOAM data in both the Geneve and the IPv6 protocol, one would >>>> > expect that the operator configures the endpoints of the Geneve >>>> > tunnel to operate on the IOAM data in Geneve, and the IPv6 routers >>>> > that the Geneve tunnel >>>> traverses to operate on the IOAM data in IPv6. >>>> > >>>> > >>>> > >>>> > Frank >>>> > >>>> > >>>> > >>>> > From: Tianran Zhou >>>> > Sent: Montag, 16. April 2018 10:37 >>>> > To: Frank Brockners (fbrockne) ; Mickey >>>> > Spiegel ; Tom Herbert >>>> > >>>> > Cc: NVO3 ; int-area@ietf.org; Service Function >>>> > Chaining IETF list ; IETF IPPM WG >>>> > Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in >>>> > various protocols - follow up from WG discussion in London >>>> > >>>> > >>>> > >>>> > Hi Frank, >>>> > >>>> > >>>> > >>>> > How does a forwarder know when and where to insert the data? >>>> > >>>> > In the case of Geneve over IPv6, do you mean the device need to >>>> > scan all the protocol stack? Or just the outer encapsulation? >>>> > >>>> > >>>> > >>>> > Tianran >>>> > >>>> > >>>> > >>>> > From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Frank >>>> > Brockners >>>> > (fbrockne) >>>> > Sent: Monday, April 16, 2018 3:08 PM >>>> > To: Mickey Spiegel ; Tom Herbert >>>> > >>>> > Cc: NVO3 ; int-area@ietf.org; Service Function >>>> > Chaining IETF list ; IETF IPPM WG >>>> > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in >>>> > various protocols - follow up from WG discussion in London >>>> > >>>> > >>>> > >>>> > >>>> > >>>> > Tom, >>>> > >>>> > >>>> > >>>> > a quick addition to what Mickey mentioned below: What you seem to >>>> > have in mind is what draft-ietf-ippm-ioam-data-02 refers to as =E2= =80=9Clayering=E2=80=9D >>>> > (see section 3.), i.e. if you=E2=80=99re running for example Geneve = over >>>> > IPv6, then IOAM data could be encapsulated in both protocols, >>>> > Geneve and >>>> > IPv6 =E2=80=93 giving you visibility into the =E2=80=9Cunderlay=E2= =80=9D (IPv6) and the =E2=80=9Coverlay=E2=80=9D >>>> (Geneve). >>>> > >>>> > >>>> > >>>> > Frank >>>> > >>>> > >>>> > >>>> > From: ippm On Behalf Of Mickey Spiegel >>>> > Sent: Freitag, 13. April 2018 20:22 >>>> > To: Tom Herbert >>>> > Cc: NVO3 ; int-area@ietf.org; Service Function >>>> > Chaining IETF list ; IETF IPPM WG >>>> > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in >>>> > various protocols - follow up from WG discussion in London >>>> > >>>> > >>>> > >>>> > Tom, >>>> > >>>> > >>>> > >>>> > On Thu, Apr 12, 2018 at 10:17 PM, Tom Herbert = wrote: >>>> > >>>> > Mickey, >>>> > >>>> > Looking at these ippm drafts more closely, I have a much more >>>> > fundamental concern. >>>> > >>>> > In draft-brockners-ippm-ioam-geneve-00 for instance, there is the >>>> > text in the introduction: >>>> > >>>> > "In-situ OAM (IOAM) records OAM information within the packet >>>> > while the packet traverses a particular network domain. The term "i= n-situ" >>>> > refers to the fact that the IOAM data fields are added to the data >>>> > packets rather than is being sent within packets specifically >>>> > dedicated to OAM. This document defines how IOAM data fields are >>>> > transported as part of the Geneve [I-D.ietf-nvo3-geneve] >>>> > encapsulation." >>>> > >>>> > I assume this means that as packets with Geneve encapsulation >>>> > traverse the network they are interpreted by intermediate nodes as >>>> > being Geneve. Since Geneve is a UDP encapsulation, then the >>>> > destination UDP port number would be used to identify packets as >>>> > being Geneve. So an intermediate device might be looking for UDP >>>> > packets destined to port >>>> > 6081 (the assigned UDP port for Geneve). If my understanding is >>>> > correct, then this is a problem. >>>> > >>>> > UDP port numbers do not have global meaning. An intermediate >>>> > device may very well see UDP packets destined to port 6081 that >>>> > are not actually Geneve. This scenario is discussed in RFC7605: >>>> > >>>> > "...intermediate device interprets traffic based on the port number. >>>> > It is important to recognize that any interpretation of port >>>> > numbers >>>> > -- except at the endpoints -- may be incorrect, because port >>>> > numbers are meaningful only at the endpoints." >>>> > >>>> > If the UDP data is modified, as the draft would imply, then >>>> > misinterpretation may also mean silent data corruption of packets. >>>> > A protocol that would allow this seems pretty incorrect! Note that >>>> > this would be true also for any UDP encapsulation that the network >>>> > tries to interpret. >>>> > >>>> > >>>> > >>>> > The intention is to allow for multiple nodes that a packet >>>> > traverses >>>> > >>>> > to be able to insert IOAM node information in the same trace >>>> > option, >>>> > >>>> > but leave some flexibility regarding which nodes actually do the >>>> > >>>> > IOAM processing and the node information. This may vary >>>> > >>>> > depending on the transport. >>>> > >>>> > >>>> > >>>> > In case of a tunneled encapsulation such as Geneve or VXLAN, >>>> > >>>> > there may still be multiple hops. For example a network may use >>>> > >>>> > Geneve or VXLAN, but only do L2 processing at ToRs, with L3 >>>> > >>>> > processing done at aggregation or core switches. In this case >>>> > >>>> > many packets would do 2 Geneve or VXLAN hops, so the packet >>>> > >>>> > would contain IOAM node information from two nodes. >>>> > >>>> > >>>> > >>>> > Another example is service function chaining using Geneve or >>>> > >>>> > VXLAN rather than NSH. >>>> > >>>> > >>>> > >>>> > >>>> > I am also wondering if hop-by-hop options been considered for this >>>> > application? Their interpretation in the network is unabiguous and >>>> > they also have the advantage that the work with any IP protocol or >>>> > encapsulation. >>>> > >>>> > >>>> > >>>> > IPv6 hop-by-hop options has been considered. See >>>> > >>>> > draft-brockners-inband-oam-transport-05. This has not yet been >>>> > >>>> > broken out into a separate draft. >>>> > >>>> > >>>> > >>>> > Mickey >>>> > >>>> > >>>> > >>>> > >>>> > Thanks, >>>> > Tom >>>> > >>>> > >>>> > On Thu, Apr 12, 2018 at 3:31 PM, Mickey Spiegel >>>> > wrote: >>>> > >>>> >> Tom, >>>> >> >>>> >> On Thu, Apr 12, 2018 at 2:46 PM, Tom Herbert = wrote: >>>> >>> >>>> >>> On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky >>>> >>> >>>> >>> wrote: >>>> >>> > Hi Frank, >>>> >>> > thank you for sharing your points. Please find my notes >>>> >>> > in-line and tagged >>>> >>> > GIM>>. I believe that this is very much relevant to work of >>>> >>> > GIM>>other >>>> >>> > working >>>> >>> > groups that directly work on the overlay encapsulations in the >>>> >>> > center of the discussion and hence I've added them to the list. >>>> >>> > Hope we'll have more opinions to reach the conclusion that is >>>> >>> > acceptable to all. >>>> >>> > >>>> >>> > Regards, >>>> >>> > Greg >>>> >>> > >>>> >>> > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) >>>> >>> > wrote: >>>> >>> >> >>>> >>> >> Back at the IPPM meeting in London, we discussed several >>>> >>> >> drafts dealing with the encapsulation of IOAM data in various >>>> >>> >> protocols (draft-brockners-ippm-ioam-vxlan-gpe-00, >>>> >>> >> draft-brockners-ippm-ioam-geneve-00, >>>> >>> >> draft-weis-ippm-ioam-gre-00). One discussion topic that we >>>> >>> >> decided to take to the list was the question on whether >>>> >>> >> draft-ooamdt-rtgwg-ooam-header could be leveraged.. After >>>> >>> >> carefully considering draft-ooamdt-rtgwg-ooam-header, I came >>>> >>> >> to the conclusion that the =E2=80=9COOAM header=E2=80=9D does n= ot meet the >>>> >>> >> needs of >>>> >>> >> IOAM: >>>> >>> >> >>>> >>> >> * Efficiency: IOAM adds data to live user traffic. As such, >>>> >>> >> an encapsulation needs to be as efficient as possible. The =E2= =80=9COOAM header=E2=80=9D >>>> >>> >> is 8 >>>> >>> >> bytes long. The approach for IOAM data encapsulation in the >>>> >>> >> above mentioned drafts only requires 4 bytes. Using the OOAM >>>> >>> >> header approach would add an unnecessary overhead of 4 bytes >>>> >>> >> =E2=80=93 which is significant. >>>> >>> Greg, >>>> >>> >>>> >>> I'm missing something here. I looked at the drafts you >>>> >>> referenced and each of them looks like the overhead for OAM is >>>> >>> greater that four bytes. In each there is some overhead >>>> >>> equivalent to type/length, for instance in Geneve four bytes are >>>> >>> needed for option class, type, and length. Unless the the OAM >>>> >>> data is zero length, I don't see how this adds up to only four byt= es of overhead. >>>> >> >>>> >> >>>> >> The four versus eight bytes just refers to the fields in the four >>>> >> bytes of IOAM info, that is common to all IOAM options. Beyond >>>> >> that, there are IOAM option specific fields. For example if doing >>>> >> one of the IOAM trace options, there are four bytes of trace >>>> >> option header, including the IOAM-trace-type, NodeLen, Flags, and >>>> >> RemainingLen fields. These are followed by the node data list >>>> >> containing the per hop IOAM information. >>>> >> >>>> >> In looking at the OOAM header content, it has nothing to do with >>>> >> any of the IOAM information after the first four bytes. It >>>> >> contains another variant of the information in the first four >>>> >> bytes of IOAM info, spread out over eight bytes. >>>> >> >>>> >>> >>>> >>> Tom >>>> >>> >>>> >>> > >>>> >>> > GIM>> The difference in four octets is because OOAM Header: >>>> >>> > >>>> >>> > provides more flexibility, e.g. Flags field and Reserved >>>> >>> > fields; >>>> >> >>>> >> >>>> >> The flags field only has one defined flag at the moment, for a >>>> >> timestamp block. For IOAM trace we need per hop timestamps, which >>>> >> the timestamp block cannot address, i.e. the timestamp block is >>>> >> redundant for >>>> IOAM. >>>> >> >>>> >>> >>>> >>> > supports larger OAM packets than iOAM header; >>>> >> >>>> >> >>>> >> For IOAM purposes, 1020 octets is more than enough. >>>> >> >>>> >>> >>>> >>> > is future proof by supporting versioning (Version field). >>>> >> >>>> >> >>>> >> IMO, taking the first two bits of the IOAM-Type to define a >>>> >> Version field would be a good thing. This does not require adding >>>> >> four more bytes of overhead. 64 IOAM-Types is more than enough. >>>> >> >>>> >>> >>>> >>> >> >>>> >>> >> * Maturity: IOAM has several implementations, which were also >>>> >>> >> shown at recent IETF hackathons =E2=80=93 and we=E2=80=99re exp= ecting >>>> >>> >> additional implementations to be publicized soon. >>>> >>> >> Interoperable implementations need timely specifications. >>>> >>> >> Despite the question being asked, the recent thread on OOAM >>>> >>> >> in the NVO3 list hasn=E2=80=99t revealed any implementation of = the OOAM header. >>>> >>> >> In >>>> >>> >> addition, the thread revealed that several fundamental >>>> >>> >> questions about the OOAM header are still open, such as >>>> >>> >> whether or how active OAM mechanisms within protocols such as >>>> >>> >> Geneve would apply to the OOAM header. This ultimately means >>>> >>> >> that we won=E2=80=99t get to a timely specification. >>>> >>> > >>>> >>> > GIM>> May I ask which encapsulations supported by the >>>> >>> > GIM>> implementations >>>> >>> > you >>>> >>> > refer to. Until very recently all iOAM proposals were to use >>>> >>> > meta-data TLV in, e.g. Geneve and NSH. And if these or some of >>>> >>> > these implementations already updated to the newly proposed >>>> >>> > iOAM shim, I don't see problem in making them use OOAM Header. >>>> >>> > Would you agree? >>>> >>> > >>>> >>> >> >>>> >>> >> * Scope: It isn=E2=80=99t entirely clear to which protocols the= OOAM >>>> >>> >> header would ultimately apply to. The way the OOAM header is >>>> >>> >> defined, OOAM uses a 8-bit field for =E2=80=9CNext Prot=E2=80= =9D, the next >>>> >>> >> protocol. Some protocols that IOAM data needs to be >>>> >>> >> encapsulated into use 16-bits for their next protocol code poin= ts. See e.g. >>>> >>> >> the GRE encapsulation =E2=80=93 as specified in >>>> >>> >> draft-weis-ippm-ioam-gre-00. >>>> >>> > >>>> >>> > GIM>> The first paragraph of the Introduction section states: >>>> >>> > New protocols that support overlay networks like VxLAN-GPE >>>> >>> > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve >>>> >>> > [I-D.ietf-nvo3-geneve], BIER >>>> >>> > [I-D.ietf-bier-mpls-encapsulation], >>>> and >>>> >>> > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. >>>> >>> > Ethernet, IPv4/IPv6, and recognize Operations, Administration= , and >>>> >>> > Maintenance (OAM) as one of distinct types. That ensures tha= t >>>> >>> > Overlay OAM (OOAM)packets are sharing fate with Overlay data = packet >>>> >>> > traversing the underlay. >>>> >>> > I'm updating the OOAM Header draft and along with cleaning >>>> >>> > nits will update reference to GUE. I think that the list and >>>> >>> > the statemnt are quite clear in identifying the scope of >>>> >>> > networks that may benefit from using not only common OOAM >>>> >>> > Header but common OOAM mechanisms, e.g. Echo Request/Reply. >>>> >>> > >>>> >>> >> With the above in mind, I=E2=80=99d suggest that the WG moves f= orward >>>> >>> >> with specific definitions for encapsulating IOAM data into >>>> >>> >> protocols =E2=80=93 per the above mentioned drafts. >>>> >>> >> >>>> >>> >> >>>> >>> >> >>>> >>> >> Regards, Frank >>>> >>> >> >>>> >>> >> >>>> >>> >> _______________________________________________ >>>> >>> >> ippm mailing list >>>> >>> >> ippm@ietf.org >>>> >>> >> https://www.ietf.org/mailman/listinfo/ippm >>>> >>> >> >>>> >>> > >>>> >>> > >>>> >>> > _______________________________________________ >>>> >>> > Int-area mailing list >>>> >>> > Int-area@ietf.org >>>> >>> > https://www.ietf.org/mailman/listinfo/int-area >>>> >>> > >>>> >>> >>>> >>> _______________________________________________ >>>> >>> ippm mailing list >>>> >>> ippm@ietf.org >>>> >>> https://www.ietf.org/mailman/listinfo/ippm >>>> >> >>>> >> >>>> > >>>> > From nobody Thu Apr 19 09:09:41 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F07EA12DA48 for ; Thu, 19 Apr 2018 09:09:30 -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=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=broadcom.com 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 QJbGpUVntDAl for ; Thu, 19 Apr 2018 09:09:28 -0700 (PDT) Received: from mail-wr0-x235.google.com (mail-wr0-x235.google.com [IPv6:2a00:1450:400c:c0c::235]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 123301243F3 for ; Thu, 19 Apr 2018 09:09:25 -0700 (PDT) Received: by mail-wr0-x235.google.com with SMTP id d1-v6so15515535wrj.13 for ; Thu, 19 Apr 2018 09:09:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=TnIKROjqurI/AVxekyILnwe0FF79ayW1+W4rtkdKG0s=; b=dq20W7spxth0zv1U/pqblfFOVVUcf2wfwrxiC6DrVZafa1QTjQqCXVnZ0kUWxLHdyL iLjALiqx8Wt5Bcep4AYUUVi41ICaIrQTrplxF1NTudVI3ppx+QrwDR5yyl4Qzwkeqzd4 xXUVhOOtpe/4oCSSyLDDGrqCDhUPrR2OWtwJk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=TnIKROjqurI/AVxekyILnwe0FF79ayW1+W4rtkdKG0s=; b=TH9Q8Sp2xmonMs1fzxtHtT/k4TsGJvUcU9VQfeH6z7gn0CZ768QIJWxt5jsE6LDVl5 H/sVJvyFHMVlUbdPIH9Zd01v4Qa+QkNmRR9lG3nBdGyac5EvISr2UZdxWEjEZjqr7Mjv NZ90gBDtIRkMbFINmuaTY/NH5sA18Boe1bhWre1JmifGvqbcomkiwoX6lffagtlnz4Zk R0pFY2gOy7Q5SefanEqDpU4F96tl+3j/gRgE3qgNHI7Vm7u9Vb8r4A0C1NeN8FAZBDq6 Sb3OC5H/9anAP0D6WrdyGtOUJpAdQdYSwJhMQ8EXIM8W7AmljcUOsGTstEQNn4ac/8Yu EXeA== X-Gm-Message-State: ALQs6tA6Q/T/IbbIMlHCRu19aDCQD/xUwCymEPOc4lcfJ3vOo3rWMFV/ KfDmuuqDQZ3SCCforu2xAbSJ/7JC7dLFYb8UeS4iPw== X-Google-Smtp-Source: AIpwx4+D0ZTNstH4ix52cYM8pPgM8tTgQ7RA0YlKrredfq77hMzXFqRTg1AfPe+hJ2X0RSBJTa+12/RFoHfIiUsktBw= X-Received: by 10.28.140.204 with SMTP id o195mr5167383wmd.35.1524154163516; Thu, 19 Apr 2018 09:09:23 -0700 (PDT) MIME-Version: 1.0 Received: by 10.223.170.155 with HTTP; Thu, 19 Apr 2018 09:09:22 -0700 (PDT) In-Reply-To: References: From: John Lemon Date: Thu, 19 Apr 2018 09:09:22 -0700 Message-ID: To: "Frank Brockners (fbrockne)" Cc: Greg Mirsky , NVO3 , "int-area@ietf.org" , Service Function Chaining IETF list , IETF IPPM WG Content-Type: multipart/alternative; boundary="001a1145b872800055056a35cb70" Archived-At: Subject: Re: [sfc] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Apr 2018 16:09:31 -0000 --001a1145b872800055056a35cb70 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I never saw a response to the request for a pointer to an OOAM implementation, so I assume none exist. I've seen several good arguments for why the existing IOAM implementation, for which several implementations exist, meets the needs for IOAM. I think it is time to put to bed the request to examine merging OOAM and IOAM. Let's move forward with IOAM and not hold it up. Respectfully, John On Thu, Apr 12, 2018 at 11:06 AM, Frank Brockners (fbrockne) < fbrockne@cisco.com> wrote: > Hi Greg, > > > > thanks =E2=80=93 and it seems that we=E2=80=99re on the same page with re= gards to > efficiency (4 bytes of non-required overhead) and maturity (or lack of) o= f > OOAM. > > > > On the IOAM implementation: There are several implementations of IOAM. > Some of which have recently been worked on and shown at an IETF hackathon= , > see https://datatracker.ietf.org/meeting/100/materials/slides- > 100-hackathon-sessa-in-situ-oam-ioam - where we=E2=80=99ve shown IPv6 and > VXLAN-GPE with IOAM =E2=80=93 on FD.io/VPP as well as on Barefoot Tofino.= You > probably also remember the Netronome/Broadcom demo - > https://www.youtube.com/watch?v=3Dj9FbD4a3F4E . > > Below you seem to be specifically referring to the IOAM open source > implementation in FD.io/VPP: There are protocol encapsulations for > VXLAN-GPE, NSH, and IPv6 implemented in FD.io/VPP. The current code uses > the =E2=80=9Cnext header approach=E2=80=9D for VXLAN-GPE and it leverages= MD-Type 2 for > NSH. As you=E2=80=99re well aware, there the discussion in SFC whether to= use > MD-Type 2 or next header encapsulating IOAM data in NSH isn=E2=80=99t yet= settled, > hence we=E2=80=99ll refrain from updating the code until SFC WG has come = to a > conclusion. > > > > Could you provide a pointer to an OOAM implementation? > > > > Thanks, > > Frank > > > > *From:* Greg Mirsky > *Sent:* Donnerstag, 12. April 2018 18:54 > *To:* Frank Brockners (fbrockne) > *Cc:* IETF IPPM WG ; NVO3 ; Service > Function Chaining IETF list ; int-area@ietf.org > *Subject:* Re: [ippm] encapsulation of IOAM data in various protocols - > follow up from WG discussion in London > > > > Hi Frank, > > thank you for sharing your points. Please find my notes in-line and tagge= d > GIM>>. I believe that this is very much relevant to work of other working > groups that directly work on the overlay encapsulations in the center of > the discussion and hence I've added them to the list. Hope we'll have mor= e > opinions to reach the conclusion that is acceptable to all. > > > > Regards, > > Greg > > > > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) < > fbrockne@cisco.com> wrote: > > Back at the IPPM meeting in London, we discussed several drafts dealing > with the encapsulation of IOAM data in various protocols > (draft-brockners-ippm-ioam-vxlan-gpe-00, draft-brockners-ippm-ioam-geneve= -00, > draft-weis-ippm-ioam-gre-00). One discussion topic that we decided to tak= e > to the list was the question on whether draft-ooamdt-rtgwg-ooam-header > could be leveraged. After carefully considering draft-ooamdt-rtgwg-ooam-= header, > I came to the conclusion that the =E2=80=9COOAM header=E2=80=9D does not = meet the needs of > IOAM: > > * Efficiency: IOAM adds data to live user traffic. As such, an > encapsulation needs to be as efficient as possible. The =E2=80=9COOAM hea= der=E2=80=9D is 8 > bytes long. The approach for IOAM data encapsulation in the above mention= ed > drafts only requires 4 bytes. Using the OOAM header approach would add an > unnecessary overhead of 4 bytes =E2=80=93 which is significant. > > GIM>> The difference in four octets is because OOAM Header: > > - provides more flexibility, e.g. Flags field and Reserved fields; > - supports larger OAM packets than iOAM header; > - is future proof by supporting versioning (Version field). > > * Maturity: IOAM has several implementations, which were also shown at > recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting additional i= mplementations to > be publicized soon. Interoperable implementations need timely > specifications. Despite the question being asked, the recent thread on OO= AM > in the NVO3 list hasn=E2=80=99t revealed any implementation of the OOAM h= eader. In > addition, the thread revealed that several fundamental questions about th= e > OOAM header are still open, such as whether or how active OAM mechanisms > within protocols such as Geneve would apply to the OOAM header. This > ultimately means that we won=E2=80=99t get to a timely specification. > > GIM>> May I ask which encapsulations supported by the implementations you > refer to. Until very recently all iOAM proposals were to use meta-data TL= V > in, e.g. Geneve and NSH. And if these or some of these implementations > already updated to the newly proposed iOAM shim, I don't see problem in > making them use OOAM Header. Would you agree? > > > > * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM head= er would > ultimately apply to. The way the OOAM header is defined, OOAM uses a 8-bi= t > field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protocols = that IOAM data > needs to be encapsulated into use 16-bits for their next protocol code > points. See e.g. the GRE encapsulation =E2=80=93 as specified in > draft-weis-ippm-ioam-gre-00. > > GIM>> The first paragraph of the Introduction section states: > > New protocols that support overlay networks like VxLAN-GPE > > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve > > [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], and > > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. > > Ethernet, IPv4/IPv6, and recognize Operations, Administration, and > > Maintenance (OAM) as one of distinct types. That ensures that > > Overlay OAM (OOAM)packets are sharing fate with Overlay data packet > > traversing the underlay. > > I'm updating the OOAM Header draft and along with cleaning nits will > update reference to GUE. I think that the list and the statemnt are quite > clear in identifying the scope of networks that may benefit from using no= t > only common OOAM Header but common OOAM mechanisms, e.g. Echo > Request/Reply > . > > > > With the above in mind, I=E2=80=99d suggest that the WG moves forward wit= h > specific definitions for encapsulating IOAM data into protocols =E2=80=93= per the > above mentioned drafts. > > > > Regards, Frank > > > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://www.ietf.org/mailman/listinfo/ippm > > > > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://www.ietf.org/mailman/listinfo/ippm > > --001a1145b872800055056a35cb70 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I never saw a response to the request for a pointer to an = OOAM implementation, so I assume none exist.

I've se= en several good arguments for why the existing IOAM implementation, for whi= ch several implementations exist, meets the needs for IOAM.

<= /div>
I think it is time to put to bed the request to examine merging O= OAM and IOAM. Let's move forward with IOAM and not hold it up.

Respectfully, John


On Thu, Apr 12, 2018 at 11:06 = AM, Frank Brockners (fbrockne) <fbrockne@cisco.com> wrote:<= br>

Hi Greg,

=C2=A0

thanks =E2=80=93 and i= t seems that we=E2=80=99re on the same page with regards to efficiency (4 b= ytes of non-required overhead) and maturity (or lack of) of OOAM.

=C2=A0

On the IOAM implementa= tion: There are several implementations of IOAM. Some of which have recentl= y been worked on and shown at an IETF hackathon, see https://datatracker.ietf.org/meeting/100/materials/slides-100-hac= kathon-sessa-in-situ-oam-ioam - where we=E2=80=99ve shown IPv6 and= VXLAN-GPE with IOAM =E2=80=93 on FD.io/VPP as well as on Barefoot Tofino. = You probably also remember the Netronome/Broadcom demo - https://www.youtube.com/watch?v=3Dj9FbD4a3F4E .

Below you seem to be s= pecifically referring to the IOAM open source implementation in FD.io/VPP: = There are protocol encapsulations for VXLAN-GPE, NSH, and IPv6 implemented in FD.io/VPP. The current code us= es the =E2=80=9Cnext header approach=E2=80=9D for VXLAN-GPE and it leverage= s MD-Type 2 for NSH. As you=E2=80=99re well aware, there the discussion in = SFC whether to use MD-Type 2 or next header encapsulating IOAM data in NSH isn=E2=80=99t yet settled, hence we=E2=80=99ll refrain fr= om updating the code until SFC WG has come to a conclusion.

=C2=A0

Could you provide a po= inter to an OOAM implementation?

=C2=A0

Thanks,<= /span>

Frank

=C2=A0

From: = Greg Mirsky <= gregimirsky@gmail.com>
Sent: Donnerstag, 12. April 2018 18:54
To: Frank Brockners (fbrockne) <fbrockne@cisco.com>
Cc: IETF IPPM WG <ippm@ietf.org>; NVO3 <nvo3@ietf.org>; Service Function Chaining IETF list <= sfc@ietf.org>; int-area@ietf.org Subject: Re: [ippm] encapsulation of IOAM data in various protocols = - follow up from WG discussion in London

=C2=A0

Hi Frank,

thank you for sharing your points. Please find my no= tes in-line and tagged GIM>>. I believe that this is very much releva= nt to work of other working groups that directly work on the overlay encaps= ulations in the center of the discussion and hence I've added them to the list. Hope we'll have more opinio= ns to reach the conclusion that is acceptable to all.

=C2=A0

Regards,

Greg

=C2=A0

On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (f= brockne) <fbrock= ne@cisco.com> wrote:

Back at the IPPM meeting in Lon= don, we discussed several drafts dealing with the encapsulation of IOAM dat= a in various protocols (draft-brockners-ippm-ioam-vxlan-gpe-00, draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). On= e discussion topic that we decided to take to the list was the question on = whether draft-ooamdt-rtgwg-ooam-header could be leveraged.=C2=A0 After care= fully considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusion that the =E2=80=9COOAM header=E2=80=9D does not m= eet the needs of IOAM:

* Efficiency: IOAM adds data to= live user traffic. As such, an encapsulation needs to be as efficient as p= ossible. The =E2=80=9COOAM header=E2=80=9D is 8 bytes long. The approach for IOAM data encapsulation in the above mentioned drafts only requires 4 = bytes. Using the OOAM header approach would add an unnecessary overhead of = 4 bytes =E2=80=93 which is significant.

GIM>> The difference in four octets is because= OOAM Header:

  • provides more flexibility, e.g. Flags field and Reserved fields;<= /u>
  • supports larger OAM packets than iOAM header;
  • is future proof by supporting versioning (Version field).

* Maturity: IOAM has several im= plementations, which were also shown at recent IETF hackathons =E2=80=93 an= d we=E2=80=99re expecting additional implementations to be publicized soon. Interoperable implementations need timely specifications. Despite th= e question being asked, the recent thread on OOAM in the NVO3 list hasn=E2= =80=99t revealed any implementation of the OOAM header. In addition, the th= read revealed that several fundamental questions about the OOAM header are still open, such as whether or how active OAM me= chanisms within protocols such as Geneve would apply to the OOAM header. Th= is ultimately means that we won=E2=80=99t get to a timely specification.

GIM>> May I ask which encapsulations supported= by the implementations you refer to. Until very recently all iOAM proposal= s were to use meta-data TLV in, e.g. Geneve and NSH. And if these or some o= f these implementations already updated to the newly proposed iOAM shim, I don't see problem in making them us= e OOAM Header. Would you agree?

=C2=A0

* Scope: It isn=E2=80=99t entir= ely clear to which protocols the OOAM header would ultimately apply to. The= way the OOAM header is defined, OOAM uses a 8-bit field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protocols that IOAM d= ata needs to be encapsulated into use 16-bits for their next protocol code = points. See e.g. the GRE encapsulation =E2=80=93 as specified in draft-weis= -ippm-ioam-gre-00.

GIM>> The first paragraph of the Introduction = section states:

=C2=A0 =C2=A0New protocols that support overlay netw= orks like VxLAN-GPE

=C2=A0 =C2=A0[I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.iet= f-nvo3-gue], Geneve

=C2=A0 =C2=A0[I-D.ietf-nvo3-geneve], BIER [I-D.ietf-= bier-mpls-encapsulation], and

=C2=A0 =C2=A0NSH [I-D.ietf-sfc-nsh] support multi-pr= otocol payload, e.g.

=C2=A0 =C2=A0Ethernet, IPv4/IPv6, and recognize Oper= ations, Administration, and

=C2=A0 =C2=A0Maintenance (OAM) as one of distinct ty= pes.=C2=A0 That ensures that

=C2=A0 =C2=A0Overlay OAM (OOAM)packets are sharing f= ate with Overlay data packet

=C2=A0 =C2=A0traversing the underlay.=C2=A0

I'm updating the OOAM Header draft and along wit= h cleaning nits will update reference to GUE. I think that the list and the= statemnt are quite clear in identifying the scope of networks that may ben= efit from using not only common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply.

=C2=A0

With the above in mind, I=E2=80= =99d suggest that the WG moves forward with specific definitions for encaps= ulating IOAM data into protocols =E2=80=93 per the above mentioned drafts.<= /span>

=C2=A0

Regards, Frank


_______________________________________________
ippm mailing list
ippm@ietf.org
ht= tps://www.ietf.org/mailman/listinfo/ippm

=C2=A0


_______________________________________________
ippm mailing list
ippm@ietf.org
https://www.ietf.org/mailman/listinfo/ippm


--001a1145b872800055056a35cb70-- From nobody Thu Apr 19 09:15:36 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6BEF4126B6E; Thu, 19 Apr 2018 09:15:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 LLfoZ8sCZBbv; Thu, 19 Apr 2018 09:15:12 -0700 (PDT) Received: from mail-lf0-x234.google.com (mail-lf0-x234.google.com [IPv6:2a00:1450:4010:c07::234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8696E1200E5; Thu, 19 Apr 2018 09:15:12 -0700 (PDT) Received: by mail-lf0-x234.google.com with SMTP id d79-v6so1011246lfd.0; Thu, 19 Apr 2018 09:15:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=Lqxlpp/4ACQzhoIYqRDPC9K9AD+biepnXMzFOnR8Pik=; b=T+pTzXFXE4bMpH2jVmtqd47zrkPIoq44XPyq3Aqc8OrCOWTiVfcMaQMKkngl1vLgLY /s70za2uXtGiNQhczANGbvbEqUmYGAQTtxdwhjZbYuHMj04VSm47H5O0dHHw74l1J3h4 vsbafRI6kuwdSVcXx+Ul7S4EOtijFrMIXmErLxJF/K6NbnxIXRa5NsEBVrGjVpnupZV2 4op6TS8t+76lK2kN8YtOV0ResFpKfpCnGE0eibLUt6IBNfsCBUGJCqINf0a+macJjs16 nG2dSFn8cjp1uGbLpi/qqeDMlC/NH10PJXSunUziAqNLPeC4Z3zm0sF6Ys1UBHQe5XBy RdVg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=Lqxlpp/4ACQzhoIYqRDPC9K9AD+biepnXMzFOnR8Pik=; b=e6zdzoCT5dTURwTvXKyI/l+aTjnQ+0LhMsiTEI1x7dXMaz9bTE3OTQOpRv4+onJbBm ltgyvijp9HJdwFNuyOQOST6ahJM8wwIEDs0wsLdW3Q/Ln21x0jhMdD7hCzgAplASVOAp t/9ONGQAuEzc0ZqqXfJw2OG9acdx6wxIoaOTz4T9O5oVu9Vk/mleCAwD+LYiw2NR+beG EF1k1QFJ5hOXMKIeJSAFB8BLjfpvncXAI5LKXMPrfa48JptBcoT7MutVyqOBEp7vv2EO FK3NdrZ3LEnF8dNYOnrlLY84gR/CKgrmf5qgppN/y8C3/kC2smmlclXXcPGnXlEEf3VA hmkA== X-Gm-Message-State: ALQs6tAwCfhB78LNENk9t41JQEGHJQB7EBW+VjGhj78xFBMtV9wj6C4X 3etQJVOwAcLdM35kckZXMLhphJ9CkK1OAKfS4Jo= X-Google-Smtp-Source: AB8JxZqAdHOFquJSb8yN7U9rHLkmgPNAGTeh2kahgO31UwXIEgDuonE4ncaAffiN9aN7Wp49ZMGuw3gBGLMRMt+1LAA= X-Received: by 2002:a19:aacd:: with SMTP id t196-v6mr466870lfe.60.1524154510592; Thu, 19 Apr 2018 09:15:10 -0700 (PDT) MIME-Version: 1.0 Received: by 10.46.73.66 with HTTP; Thu, 19 Apr 2018 09:15:09 -0700 (PDT) In-Reply-To: References: From: Greg Mirsky Date: Thu, 19 Apr 2018 09:15:09 -0700 Message-ID: To: "Frank Brockners (fbrockne)" Cc: IETF IPPM WG , NVO3 , Service Function Chaining IETF list , int-area@ietf.org Content-Type: multipart/alternative; boundary="0000000000002fcfa7056a35e02f" Archived-At: Subject: Re: [sfc] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Apr 2018 16:15:19 -0000 --0000000000002fcfa7056a35e02f Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Frank, et. al, we have a very good discussion, thank you. I have a question and appreciate your consideration: - encapsulation documents refer to IOAM HDR, its length is reflected in the field labeled either Length or IOAM HDR len. But I cannot find the definition of IOAM HDR. What is the IOAM HDR? Regards, Greg On Wed, Apr 11, 2018 at 3:02 AM, Frank Brockners (fbrockne) < fbrockne@cisco.com> wrote: > Back at the IPPM meeting in London, we discussed several drafts dealing > with the encapsulation of IOAM data in various protocols > (draft-brockners-ippm-ioam-vxlan-gpe-00, draft-brockners-ippm-ioam-geneve= -00, > draft-weis-ippm-ioam-gre-00). One discussion topic that we decided to tak= e > to the list was the question on whether draft-ooamdt-rtgwg-ooam-header > could be leveraged. After carefully considering draft-ooamdt-rtgwg-ooam-= header, > I came to the conclusion that the =E2=80=9COOAM header=E2=80=9D does not = meet the needs of > IOAM: > > * Efficiency: IOAM adds data to live user traffic. As such, an > encapsulation needs to be as efficient as possible. The =E2=80=9COOAM hea= der=E2=80=9D is 8 > bytes long. The approach for IOAM data encapsulation in the above mention= ed > drafts only requires 4 bytes. Using the OOAM header approach would add an > unnecessary overhead of 4 bytes =E2=80=93 which is significant. > > * Maturity: IOAM has several implementations, which were also shown at > recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting additional i= mplementations to > be publicized soon. Interoperable implementations need timely > specifications. Despite the question being asked, the recent thread on OO= AM > in the NVO3 list hasn=E2=80=99t revealed any implementation of the OOAM h= eader. In > addition, the thread revealed that several fundamental questions about th= e > OOAM header are still open, such as whether or how active OAM mechanisms > within protocols such as Geneve would apply to the OOAM header. This > ultimately means that we won=E2=80=99t get to a timely specification. > > * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM head= er would > ultimately apply to. The way the OOAM header is defined, OOAM uses a 8-bi= t > field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protocols = that IOAM data > needs to be encapsulated into use 16-bits for their next protocol code > points. See e.g. the GRE encapsulation =E2=80=93 as specified in > draft-weis-ippm-ioam-gre-00. > > With the above in mind, I=E2=80=99d suggest that the WG moves forward wit= h > specific definitions for encapsulating IOAM data into protocols =E2=80=93= per the > above mentioned drafts. > > > > Regards, Frank > > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://www.ietf.org/mailman/listinfo/ippm > > --0000000000002fcfa7056a35e02f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Frank, et. al,
we have a very good discussion, than= k you. I have a question and appreciate your consideration:
    <= li>encapsulation documents refer to IOAM HDR, its length is reflected in th= e field labeled either Length or IOAM HDR len. But I cannot find the defini= tion of IOAM HDR. What is the IOAM HDR?

= Regards,
Greg

 --0000000000002fcfa7056a35e02f-- From nobody Thu Apr 19 09:31:37 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 233CB12DA28; Thu, 19 Apr 2018 09:31:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 KJcJuJNxH0z4; Thu, 19 Apr 2018 09:31:02 -0700 (PDT) Received: from mail-lf0-x234.google.com (mail-lf0-x234.google.com [IPv6:2a00:1450:4010:c07::234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0BDEF12DA4F; Thu, 19 Apr 2018 09:31:02 -0700 (PDT) Received: by mail-lf0-x234.google.com with SMTP id x130-v6so1047960lff.9; Thu, 19 Apr 2018 09:31:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=PXxDqdkMEO81504Z0o2gv7fJaO1X6Dsm2ZmgojdsdgY=; b=UqMDMfzaAq3x4/uFAmXQoxSZu5jwlbQZrNZOANbXkuwdgiXIR37jPITU6SXDXTE/5B 5DkkHnbzaDU59OkcMHvc9+dh0NU4IsWPCrqpX8PFcqzNN/Ab3WYRs3l3IUv7GC7bWH9v qj1AmVcFRVVMzckZdukjZ2THGKIyuRqnr7+rWTPJZV9Imo2ffpbGHU1PbmZDmUVVr74B mKEduKvCjsBW0halpw22TTnNOKVMH1aU2qdSv8P/ld+P86c3mpBK6nv1HA7ZRiE4//CQ lcHXPg15wuFdFGXblvvWhAgNNN8hlu1+HfLfaQzbN4reegn9VXre+tIQC+V6ZG1xXb/B BF4A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=PXxDqdkMEO81504Z0o2gv7fJaO1X6Dsm2ZmgojdsdgY=; b=Emlz+7+bUkdyMH5G597pfDFcbT3z5SOOhiiESxXB++IlM5qckZKgL+ZdD3eRi3oUsJ oHoX2N+7M8dNj0S58gt/mCcBqnKa6d9EOt0CcuKFq+k+6IBsFS04gIaOf5VnARCLwpgf RBJvEHNxi5WRB/mBsit4yyPz879CcQg0TVIoU0Q46vtQg7oKAruTkhqaYl1nJlo0piD/ bkyTLHJ2eO5m+/KvmZCK2o3kK8Vfx7mYNo/7ej1OvbdAttXw6U/iZE/YDQ8S7C8XE2md sed23TnzTqlwxdy3UsMxl+5M00qt6ofVV5g///3PITdMnPTXzXU04WylWhFF51AD3U8f 88Fw== X-Gm-Message-State: ALQs6tAfPbkaZ7XE7+bCzSfvawZIsybGEP1cyDxolJa+eqJIpIpM8269 s2ag/ImveH99L5NRYrXyx6kEdeGVf/yINewYPHo= X-Google-Smtp-Source: AIpwx49aasDDIQJqsm3jdNOhld8KDkeSrPWRwe8Xx9ciJvnzDUS1xeoaN2k7GUT86LSu0VvgMvibtIAMwERHRjJMFO8= X-Received: by 10.46.156.81 with SMTP id t17mr4990143ljj.58.1524155460180; Thu, 19 Apr 2018 09:31:00 -0700 (PDT) MIME-Version: 1.0 Received: by 10.46.73.66 with HTTP; Thu, 19 Apr 2018 09:30:59 -0700 (PDT) In-Reply-To: References: From: Greg Mirsky Date: Thu, 19 Apr 2018 09:30:59 -0700 Message-ID: To: John Lemon Cc: "Frank Brockners (fbrockne)" , NVO3 , "int-area@ietf.org" , Service Function Chaining IETF list , IETF IPPM WG Content-Type: multipart/alternative; boundary="f4f5e80ee2f8c96174056a361897" Archived-At: Subject: Re: [sfc] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Apr 2018 16:31:10 -0000 --f4f5e80ee2f8c96174056a361897 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi John, I don't argue with the importance of interoperable implementations (though early implementations accept the risk of non-compliance with the final specification, for example, SFC NSH). At the same time, I don't think that mere fact of existing implementation should cancel discussion of technical characteristics of the proposed approaches to hybrid OAM. Regards, Greg On Thu, Apr 19, 2018 at 9:09 AM, John Lemon wrote= : > I never saw a response to the request for a pointer to an OOAM > implementation, so I assume none exist. > > I've seen several good arguments for why the existing IOAM implementation= , > for which several implementations exist, meets the needs for IOAM. > > I think it is time to put to bed the request to examine merging OOAM and > IOAM. Let's move forward with IOAM and not hold it up. > > Respectfully, John > > > On Thu, Apr 12, 2018 at 11:06 AM, Frank Brockners (fbrockne) < > fbrockne@cisco.com> wrote: > >> Hi Greg, >> >> >> >> thanks =E2=80=93 and it seems that we=E2=80=99re on the same page with r= egards to >> efficiency (4 bytes of non-required overhead) and maturity (or lack of) = of >> OOAM. >> >> >> >> On the IOAM implementation: There are several implementations of IOAM. >> Some of which have recently been worked on and shown at an IETF hackatho= n, >> see https://datatracker.ietf.org/meeting/100/materials/slides-10 >> 0-hackathon-sessa-in-situ-oam-ioam - where we=E2=80=99ve shown IPv6 and >> VXLAN-GPE with IOAM =E2=80=93 on FD.io/VPP as well as on Barefoot Tofino= . You >> probably also remember the Netronome/Broadcom demo - >> https://www.youtube.com/watch?v=3Dj9FbD4a3F4E . >> >> Below you seem to be specifically referring to the IOAM open source >> implementation in FD.io/VPP: There are protocol encapsulations for >> VXLAN-GPE, NSH, and IPv6 implemented in FD.io/VPP. The current code uses >> the =E2=80=9Cnext header approach=E2=80=9D for VXLAN-GPE and it leverage= s MD-Type 2 for >> NSH. As you=E2=80=99re well aware, there the discussion in SFC whether t= o use >> MD-Type 2 or next header encapsulating IOAM data in NSH isn=E2=80=99t ye= t settled, >> hence we=E2=80=99ll refrain from updating the code until SFC WG has come= to a >> conclusion. >> >> >> >> Could you provide a pointer to an OOAM implementation? >> >> >> >> Thanks, >> >> Frank >> >> >> >> *From:* Greg Mirsky >> *Sent:* Donnerstag, 12. April 2018 18:54 >> *To:* Frank Brockners (fbrockne) >> *Cc:* IETF IPPM WG ; NVO3 ; Service >> Function Chaining IETF list ; int-area@ietf.org >> *Subject:* Re: [ippm] encapsulation of IOAM data in various protocols - >> follow up from WG discussion in London >> >> >> >> Hi Frank, >> >> thank you for sharing your points. Please find my notes in-line and >> tagged GIM>>. I believe that this is very much relevant to work of other >> working groups that directly work on the overlay encapsulations in the >> center of the discussion and hence I've added them to the list. Hope we'= ll >> have more opinions to reach the conclusion that is acceptable to all. >> >> >> >> Regards, >> >> Greg >> >> >> >> On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) < >> fbrockne@cisco.com> wrote: >> >> Back at the IPPM meeting in London, we discussed several drafts dealing >> with the encapsulation of IOAM data in various protocols >> (draft-brockners-ippm-ioam-vxlan-gpe-00, draft-brockners-ippm-ioam-genev= e-00, >> draft-weis-ippm-ioam-gre-00). One discussion topic that we decided to ta= ke >> to the list was the question on whether draft-ooamdt-rtgwg-ooam-header >> could be leveraged. After carefully considering >> draft-ooamdt-rtgwg-ooam-header, I came to the conclusion that the =E2=80= =9COOAM >> header=E2=80=9D does not meet the needs of IOAM: >> >> * Efficiency: IOAM adds data to live user traffic. As such, an >> encapsulation needs to be as efficient as possible. The =E2=80=9COOAM he= ader=E2=80=9D is 8 >> bytes long. The approach for IOAM data encapsulation in the above mentio= ned >> drafts only requires 4 bytes. Using the OOAM header approach would add a= n >> unnecessary overhead of 4 bytes =E2=80=93 which is significant. >> >> GIM>> The difference in four octets is because OOAM Header: >> >> - provides more flexibility, e.g. Flags field and Reserved fields; >> - supports larger OAM packets than iOAM header; >> - is future proof by supporting versioning (Version field). >> >> * Maturity: IOAM has several implementations, which were also shown at >> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting additional = implementations to >> be publicized soon. Interoperable implementations need timely >> specifications. Despite the question being asked, the recent thread on O= OAM >> in the NVO3 list hasn=E2=80=99t revealed any implementation of the OOAM = header. In >> addition, the thread revealed that several fundamental questions about t= he >> OOAM header are still open, such as whether or how active OAM mechanisms >> within protocols such as Geneve would apply to the OOAM header. This >> ultimately means that we won=E2=80=99t get to a timely specification. >> >> GIM>> May I ask which encapsulations supported by the implementations yo= u >> refer to. Until very recently all iOAM proposals were to use meta-data T= LV >> in, e.g. Geneve and NSH. And if these or some of these implementations >> already updated to the newly proposed iOAM shim, I don't see problem in >> making them use OOAM Header. Would you agree? >> >> >> >> * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM hea= der would >> ultimately apply to. The way the OOAM header is defined, OOAM uses a 8-b= it >> field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protocols= that IOAM data >> needs to be encapsulated into use 16-bits for their next protocol code >> points. See e.g. the GRE encapsulation =E2=80=93 as specified in >> draft-weis-ippm-ioam-gre-00. >> >> GIM>> The first paragraph of the Introduction section states: >> >> New protocols that support overlay networks like VxLAN-GPE >> >> [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve >> >> [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], and >> >> NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. >> >> Ethernet, IPv4/IPv6, and recognize Operations, Administration, and >> >> Maintenance (OAM) as one of distinct types. That ensures that >> >> Overlay OAM (OOAM)packets are sharing fate with Overlay data packet >> >> traversing the underlay. >> >> I'm updating the OOAM Header draft and along with cleaning nits will >> update reference to GUE. I think that the list and the statemnt are quit= e >> clear in identifying the scope of networks that may benefit from using n= ot >> only common OOAM Header but common OOAM mechanisms, e.g. Echo >> Request/Reply >> . >> >> >> >> With the above in mind, I=E2=80=99d suggest that the WG moves forward wi= th >> specific definitions for encapsulating IOAM data into protocols =E2=80= =93 per the >> above mentioned drafts. >> >> >> >> Regards, Frank >> >> >> _______________________________________________ >> ippm mailing list >> ippm@ietf.org >> https://www.ietf.org/mailman/listinfo/ippm >> >> >> >> _______________________________________________ >> ippm mailing list >> ippm@ietf.org >> https://www.ietf.org/mailman/listinfo/ippm >> >> > --f4f5e80ee2f8c96174056a361897 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi John,
I don't argue with the importance of inte= roperable implementations (though early implementations accept=C2=A0the ris= k=C2=A0of non-compliance=C2=A0with the final specification, for=C2=A0exampl= e, SFC NSH). At the same time, I don't think that mere fact of existing= implementation should cancel discussion of technical characteristics of th= e proposed approaches to hybrid OAM.

Regards,
Greg

On Thu, Apr 19, 2018 at 9:09 AM, John Lemon <john.lemon@broadco= m.com> wrote:
I never saw a response to the request for a pointer to an OOAM implemen= tation, so I assume none exist.

I've seen several go= od arguments for why the existing IOAM implementation, for which several im= plementations exist, meets the needs for IOAM.

I t= hink it is time to put to bed the request to examine merging OOAM and IOAM.= Let's move forward with IOAM and not hold it up.

<= div>Respectfully, John


On = Thu, Apr 12, 2018 at 11:06 AM, Frank Brockners (fbrockne) <fbrockne@cisco= .com> wrote:

Hi Greg,

=C2=A0

thanks =E2=80=93 and i= t seems that we=E2=80=99re on the same page with regards to efficiency (4 b= ytes of non-required overhead) and maturity (or lack of) of OOAM.

=C2=A0

On the IOAM implementa= tion: There are several implementations of IOAM. Some of which have recentl= y been worked on and shown at an IETF hackathon, see https://datatracker.ietf.org/meeting/100/materials/slides-100-hac= kathon-sessa-in-situ-oam-ioam - where we=E2=80=99ve shown IPv6 and= VXLAN-GPE with IOAM =E2=80=93 on FD.io/VPP as well as on Barefoot Tofino. = You probably also remember the Netronome/Broadcom demo - https://www.youtube.com/watch?v=3Dj9FbD4a3F4E .

Below you seem to be s= pecifically referring to the IOAM open source implementation in FD.io/VPP: = There are protocol encapsulations for VXLAN-GPE, NSH, and IPv6 implemented in FD.io/VPP. The current code us= es the =E2=80=9Cnext header approach=E2=80=9D for VXLAN-GPE and it leverage= s MD-Type 2 for NSH. As you=E2=80=99re well aware, there the discussion in = SFC whether to use MD-Type 2 or next header encapsulating IOAM data in NSH isn=E2=80=99t yet settled, hence we=E2=80=99ll refrain fr= om updating the code until SFC WG has come to a conclusion.

=C2=A0

Could you provide a po= inter to an OOAM implementation?

=C2=A0

Thanks,<= /span>

Frank

=C2=A0

From: = Greg Mirsky <= gregimirsky@gmail.com>
Sent: Donnerstag, 12. April 2018 18:54
To: Frank Brockners (fbrockne) <fbrockne@cisco.com>
Cc: IETF IPPM WG <ippm@ietf.org>; NVO3 <nvo3@ietf.org>; Service Function Chaining IETF list <= sfc@ietf.org>; int-area@ietf.org Subject: Re: [ippm] encapsulation of IOAM data in various protocols = - follow up from WG discussion in London

=C2=A0

Hi Frank,

thank you for sharing your points. Please find my no= tes in-line and tagged GIM>>. I believe that this is very much releva= nt to work of other working groups that directly work on the overlay encaps= ulations in the center of the discussion and hence I've added them to the list. Hope we'll have more opinio= ns to reach the conclusion that is acceptable to all.

=C2=A0

Regards,

Greg

=C2=A0

On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (f= brockne) <fbrock= ne@cisco.com> wrote:

Back at the IPPM meeting in Lon= don, we discussed several drafts dealing with the encapsulation of IOAM dat= a in various protocols (draft-brockners-ippm-ioam-vxlan-gpe-00, draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). On= e discussion topic that we decided to take to the list was the question on = whether draft-ooamdt-rtgwg-ooam-header could be leveraged.=C2=A0 After care= fully considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusion that the =E2=80=9COOAM header=E2=80=9D does not m= eet the needs of IOAM:

* Efficiency: IOAM adds data to= live user traffic. As such, an encapsulation needs to be as efficient as p= ossible. The =E2=80=9COOAM header=E2=80=9D is 8 bytes long. The approach for IOAM data encapsulation in the above mentioned drafts only requires 4 = bytes. Using the OOAM header approach would add an unnecessary overhead of = 4 bytes =E2=80=93 which is significant.

GIM>> The difference in four octets is because= OOAM Header:

  • provides more flexibility, e.g. Flags field and Reserved fields;<= /u>
  • supports larger OAM packets than iOAM header;
  • is future proof by supporting versioning (Version field).

* Maturity: IOAM has several im= plementations, which were also shown at recent IETF hackathons =E2=80=93 an= d we=E2=80=99re expecting additional implementations to be publicized soon. Interoperable implementations need timely specifications. Despite th= e question being asked, the recent thread on OOAM in the NVO3 list hasn=E2= =80=99t revealed any implementation of the OOAM header. In addition, the th= read revealed that several fundamental questions about the OOAM header are still open, such as whether or how active OAM me= chanisms within protocols such as Geneve would apply to the OOAM header. Th= is ultimately means that we won=E2=80=99t get to a timely specification.

GIM>> May I ask which encapsulations supported= by the implementations you refer to. Until very recently all iOAM proposal= s were to use meta-data TLV in, e.g. Geneve and NSH. And if these or some o= f these implementations already updated to the newly proposed iOAM shim, I don't see problem in making them us= e OOAM Header. Would you agree?

=C2=A0

* Scope: It isn=E2=80=99t entir= ely clear to which protocols the OOAM header would ultimately apply to. The= way the OOAM header is defined, OOAM uses a 8-bit field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protocols that IOAM d= ata needs to be encapsulated into use 16-bits for their next protocol code = points. See e.g. the GRE encapsulation =E2=80=93 as specified in draft-weis= -ippm-ioam-gre-00.

GIM>> The first paragraph of the Introduction = section states:

=C2=A0 =C2=A0New protocols that support overlay netw= orks like VxLAN-GPE

=C2=A0 =C2=A0[I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.iet= f-nvo3-gue], Geneve

=C2=A0 =C2=A0[I-D.ietf-nvo3-geneve], BIER [I-D.ietf-= bier-mpls-encapsulation], and

=C2=A0 =C2=A0NSH [I-D.ietf-sfc-nsh] support multi-pr= otocol payload, e.g.

=C2=A0 =C2=A0Ethernet, IPv4/IPv6, and recognize Oper= ations, Administration, and

=C2=A0 =C2=A0Maintenance (OAM) as one of distinct ty= pes.=C2=A0 That ensures that

=C2=A0 =C2=A0Overlay OAM (OOAM)packets are sharing f= ate with Overlay data packet

=C2=A0 =C2=A0traversing the underlay.=C2=A0

I'm updating the OOAM Header draft and along wit= h cleaning nits will update reference to GUE. I think that the list and the= statemnt are quite clear in identifying the scope of networks that may ben= efit from using not only common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply.

=C2=A0

With the above in mind, I=E2=80= =99d suggest that the WG moves forward with specific definitions for encaps= ulating IOAM data into protocols =E2=80=93 per the above mentioned drafts.<= /span>

=C2=A0

Regards, Frank


_______________________________________________
ippm mailing list
ippm@ietf.org
ht= tps://www.ietf.org/mailman/listinfo/ippm

=C2=A0


_______________________________________________
ippm mailing list
ippm@ietf.org
https://www.ietf.org/mailman/listinfo/ippm



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Brockners (fbrockne)" To: Greg Mirsky CC: IETF IPPM WG , NVO3 , "Service Function Chaining IETF list" , "int-area@ietf.org" Thread-Topic: [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AdPRe/DslDwu34XkSmq8g6ttV3Kt0QGp44SAAAmXEdA= Date: Thu, 19 Apr 2018 16:54:26 +0000 Message-ID: <81b2598c54944ba887248cbce2f66575@XCH-RCD-008.cisco.com> References: In-Reply-To: Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.55.117.3] Content-Type: multipart/alternative; boundary="_000_81b2598c54944ba887248cbce2f66575XCHRCD008ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: 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Service Function Chaining IETF list , "int-area@ietf.org" Content-Type: multipart/alternative; boundary="000000000000bb66b8056a36dfcd" Archived-At: Subject: Re: [sfc] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Apr 2018 17:26:42 -0000 --000000000000bb66b8056a36dfcd Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Frank, thank you for your expedient response. Yes, clarification and consistent terminology, of course as different encapsulations allow that, will help. What I'm looking through the iOAM encapsulation drafts is the answer to this question How a system that is not using iOAM can get to the data payload that follows the iOAM message? Is there the field in the iOAM shim that allows the system to skip over the iOAM message (by iOAM message I mean iOAM shim and iOAM data)? Would such system be required to parse other than iOAM shim constructs? I couldn't find this scenario being discussed in any of iOAM encapsulation drafts. Have I missed it? Regards, Greg On Thu, Apr 19, 2018 at 9:54 AM, Frank Brockners (fbrockne) < fbrockne@cisco.com> wrote: > Hi Greg, > > > > good catch =E2=80=93 there is a bit of loose language in some of the draf= ts. We=E2=80=99ll > make things crisper in the next rev. Note that there is no generic =E2=80= =9CIOAM > header=E2=80=9D but that definition is always within the context of a par= ticular > encapsulation protocol. draft-weis-ippm-ioam-gre-00 already has a > definition of the IOAM header (for GRE) =E2=80=93 see section 3. For the = other > drafts, we use language like =E2=80=9CThe IOAM related fields in VXLAN-GP= E are > defined as follows=E2=80=9D or =E2=80=9CThe fields related to the encapsu= lation of IOAM > data fields in Geneve are defined as follows=E2=80=9D, i.e. the informati= on that is > required to perform the encapsulation into the parent protocol, along wit= h > the actual IOAM data fields. Moving forward, we can be crisper and split > things into an =E2=80=9Cencapsulation dependent part=E2=80=9D and a =E2= =80=9Cdata part=E2=80=9D. > > > > Frank > > > > *From:* Greg Mirsky > *Sent:* Donnerstag, 19. April 2018 18:15 > *To:* Frank Brockners (fbrockne) > *Cc:* IETF IPPM WG ; NVO3 ; Service > Function Chaining IETF list ; int-area@ietf.org > *Subject:* Re: [ippm] encapsulation of IOAM data in various protocols - > follow up from WG discussion in London > > > > Hi Frank, et. al, > > we have a very good discussion, thank you. I have a question and > appreciate your consideration: > > - encapsulation documents refer to IOAM HDR, its length is reflected > in the field labeled either Length or IOAM HDR len. But I cannot find = the > definition of IOAM HDR. What is the IOAM HDR? > > > > Regards, > > Greg > > > > > > On Wed, Apr 11, 2018 at 3:02 AM, Frank Brockners (fbrockne) < > fbrockne@cisco.com> wrote: > > Back at the IPPM meeting in London, we discussed several drafts dealing > with the encapsulation of IOAM data in various protocols > (draft-brockners-ippm-ioam-vxlan-gpe-00, draft-brockners-ippm-ioam-geneve= -00, > draft-weis-ippm-ioam-gre-00). One discussion topic that we decided to tak= e > to the list was the question on whether draft-ooamdt-rtgwg-ooam-header > could be leveraged. After carefully considering draft-ooamdt-rtgwg-ooam-= header, > I came to the conclusion that the =E2=80=9COOAM header=E2=80=9D does not = meet the needs of > IOAM: > > * Efficiency: IOAM adds data to live user traffic. As such, an > encapsulation needs to be as efficient as possible. The =E2=80=9COOAM hea= der=E2=80=9D is 8 > bytes long. The approach for IOAM data encapsulation in the above mention= ed > drafts only requires 4 bytes. Using the OOAM header approach would add an > unnecessary overhead of 4 bytes =E2=80=93 which is significant. > > * Maturity: IOAM has several implementations, which were also shown at > recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting additional i= mplementations to > be publicized soon. Interoperable implementations need timely > specifications. Despite the question being asked, the recent thread on OO= AM > in the NVO3 list hasn=E2=80=99t revealed any implementation of the OOAM h= eader. In > addition, the thread revealed that several fundamental questions about th= e > OOAM header are still open, such as whether or how active OAM mechanisms > within protocols such as Geneve would apply to the OOAM header. This > ultimately means that we won=E2=80=99t get to a timely specification. > > * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM head= er would > ultimately apply to. The way the OOAM header is defined, OOAM uses a 8-bi= t > field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protocols = that IOAM data > needs to be encapsulated into use 16-bits for their next protocol code > points. See e.g. the GRE encapsulation =E2=80=93 as specified in > draft-weis-ippm-ioam-gre-00. > > With the above in mind, I=E2=80=99d suggest that the WG moves forward wit= h > specific definitions for encapsulating IOAM data into protocols =E2=80=93= per the > above mentioned drafts. > > > > Regards, Frank > > > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://www.ietf.org/mailman/listinfo/ippm > > > --000000000000bb66b8056a36dfcd Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Frank,
thank you for your expedient response. Yes, = clarification=C2=A0and consistent terminology, of course as different encap= sulations allow that, will help. What I'm looking through the iOAM enca= psulation drafts is the answer to this question How a system that is not us= ing iOAM can get to the data payload that follows the iOAM message? Is ther= e the field in the iOAM shim that allows the system to skip over the iOAM m= essage (by iOAM message I mean iOAM shim and iOAM data)? Would such system = be required to parse other than iOAM shim constructs? I couldn't find t= his scenario being discussed in any of iOAM encapsulation drafts. Have I mi= ssed it?

Regards,
Greg

On Thu, Apr 19, 2018 at= 9:54 AM, Frank Brockners (fbrockne) <fbrockne@cisco.com> w= rote:

Hi Greg,

=C2=A0

good catch =E2=80=93 t= here is a bit of loose language in some of the drafts. We=E2=80=99ll make t= hings crisper in the next rev. Note that there is no generic =E2=80=9CIOAM header=E2=80=9D but that definition is a= lways within the context of a particular encapsulation protocol. draft-weis= -ippm-ioam-gre-00 already has a definition of the IOAM header (for GRE) =E2= =80=93 see section 3. For the other drafts, we use language like =E2=80=9CThe IOAM related fields in VXLAN-GPE are defined as follows= =E2=80=9D or =E2=80=9CThe fields related to the encapsulation of IOAM data = fields in Geneve are defined as follows=E2=80=9D, i.e. the information that= is required to perform the encapsulation into the parent protocol, along with the actual IOAM data fields. Moving forward, we can be crisper = and split things into an =E2=80=9Cencapsulation dependent part=E2=80=9D and= a =E2=80=9Cdata part=E2=80=9D.

=C2=A0

Frank

=C2=A0

From: = Greg Mirsky <= gregimirsky@gmail.com>
Sent: Donnerstag, 19. April 2018 18:15
To: Frank Brockners (fbrockne) <fbrockne@cisco.com>
Cc: IETF IPPM WG <ippm@ietf.org>; NVO3 <nvo3@ietf.org>; Service Function Chaining IETF list <= sfc@ietf.org>; int-area@ietf.org Subject: Re: [ippm] encapsulation of IOAM data in various protocols = - follow up from WG discussion in London

=C2=A0

Hi Frank, et. al,

we have a very good discussion, thank you. I have a = question and appreciate your consideration:

  • encapsulation documents refer to IOAM HDR, its length is reflected in the f= ield labeled either Length or IOAM HDR len. But I cannot find the definitio= n of IOAM HDR. What is the IOAM HDR?

=C2=A0

Regards,

Greg

=C2=A0

=C2=A0

On Wed, Apr 11, 2018 at 3:02 AM, Frank Brockners (fb= rockne) <fbrockn= e@cisco.com> wrote:

Back at the IPPM meeting in Lon= don, we discussed several drafts dealing with the encapsulation of IOAM dat= a in various protocols (draft-brockners-ippm-ioam-vxlan-gpe-00, draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). On= e discussion topic that we decided to take to the list was the question on = whether draft-ooamdt-rtgwg-ooam-header could be leveraged.=C2=A0 After care= fully considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusion that the =E2=80=9COOAM header=E2=80=9D does not m= eet the needs of IOAM:

* Efficiency: IOAM adds data to= live user traffic. As such, an encapsulation needs to be as efficient as p= ossible. The =E2=80=9COOAM header=E2=80=9D is 8 bytes long. The approach for IOAM data encapsulation in the above mentioned drafts only requires 4 = bytes. Using the OOAM header approach would add an unnecessary overhead of = 4 bytes =E2=80=93 which is significant.

* Maturity: IOAM has several im= plementations, which were also shown at recent IETF hackathons =E2=80=93 an= d we=E2=80=99re expecting additional implementations to be publicized soon. Interoperable implementations need timely specifications. Despite th= e question being asked, the recent thread on OOAM in the NVO3 list hasn=E2= =80=99t revealed any implementation of the OOAM header. In addition, the th= read revealed that several fundamental questions about the OOAM header are still open, such as whether or how active OAM me= chanisms within protocols such as Geneve would apply to the OOAM header. Th= is ultimately means that we won=E2=80=99t get to a timely specification.

* Scope: It isn=E2=80=99t entir= ely clear to which protocols the OOAM header would ultimately apply to. The= way the OOAM header is defined, OOAM uses a 8-bit field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protocols that IOAM d= ata needs to be encapsulated into use 16-bits for their next protocol code = points. See e.g. the GRE encapsulation =E2=80=93 as specified in draft-weis= -ippm-ioam-gre-00.

With the above in mind, I=E2=80= =99d suggest that the WG moves forward with specific definitions for encaps= ulating IOAM data into protocols =E2=80=93 per the above mentioned drafts.<= /span>

=C2=A0

Regards, Frank


_______________________________________________
ippm mailing list
ippm@ietf.org
ht= tps://www.ietf.org/mailman/listinfo/ippm

=C2=A0


--000000000000bb66b8056a36dfcd-- From nobody Thu Apr 19 15:53:45 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B68A812E87C for ; Thu, 19 Apr 2018 15:53:43 -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); dkim=pass (1024-bit key) header.d=broadcom.com 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 GFyQwQRkLF_o for ; Thu, 19 Apr 2018 15:53:40 -0700 (PDT) Received: from mail-wr0-x236.google.com (mail-wr0-x236.google.com [IPv6:2a00:1450:400c:c0c::236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7286312E887 for ; Thu, 19 Apr 2018 15:53:39 -0700 (PDT) Received: by mail-wr0-x236.google.com with SMTP id f14-v6so18082983wre.4 for ; Thu, 19 Apr 2018 15:53:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=p2HdNYLhCRrHzdwImafYHWyKl4fnp+EOoKlXqbumTaI=; b=JSgsLUhZK2EgSQpI6jWAtQOYHxdX6BHReVsb4KU2ye4CmVXMgaoD6muEkGpfGcrO4N G0U43HWS3ara7icXzc/koyk01LPPeQyjP4vpIdN8UdMfCfr2cUvEmJz7G+fcG2OCCGvS I/ps0T9XAQ+e5Ss/kKhym2Rq67tHJSZ5ZInAE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=p2HdNYLhCRrHzdwImafYHWyKl4fnp+EOoKlXqbumTaI=; b=MVHBLObrkBm1BuahUZd4t74H+R1o+YO+grIIjDCpknksUxwpGrkYdNqHntAsCgaIIb vYR2Uqe5Qfyfyp8ZmZYuwVmlWkE1qWCy31sfbw/ZMEYdDdfnno09cLr7UnDuwOIEejQ+ +wLKivtkqRn5VaClQ82HOY7HQuJwFgLOhN4zrK4oTiVranoi75vfX4hr/UssoKdvq0Uo X2DJcL9jlXjSxzfZkIzfh93UkwInzlVPs8McAntGzY/rPLGAXr9i8RCMaT7wOcKMjwff O4v95ulPcLo2rxn4nmdBl4K3drdxYdcIshilOKBOoHEj/K7HzuzcUtjuEJRX80BiSzCi TRbw== X-Gm-Message-State: ALQs6tDWNM3zHvPNnXr2QiYUWuAtUbjH/uaLEz+xcluU5499LP8nWyxS yIqw2ZFTn3yoyPxMGVB24hQY3zvYn0sVAErn35fEnF/IZ+M= X-Google-Smtp-Source: AIpwx4/HcgDZmw7JPdRJkMiRY+ELkOaaa6V0T1sFkOLfQ53kiKq4PSsM75oaHysGocveOl/9I7PWLd7/V/2PDsKDSFk= X-Received: by 10.28.60.194 with SMTP id j185mr324987wma.159.1524178417907; Thu, 19 Apr 2018 15:53:37 -0700 (PDT) MIME-Version: 1.0 Received: by 10.223.170.155 with HTTP; Thu, 19 Apr 2018 15:53:37 -0700 (PDT) In-Reply-To: References: From: John Lemon Date: Thu, 19 Apr 2018 15:53:37 -0700 Message-ID: To: Greg Mirsky Cc: "Frank Brockners (fbrockne)" , NVO3 , "int-area@ietf.org" , Service Function Chaining IETF list , IETF IPPM WG Content-Type: multipart/alternative; boundary="001a114a4d0c2cb223056a3b7197" Archived-At: Subject: Re: [sfc] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Apr 2018 22:53:44 -0000 --001a114a4d0c2cb223056a3b7197 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Greg, I never stated "that mere fact of existing implementation should cancel discussion of technical characteristics of the proposed approaches to hybrid OAM". I just noted implementation status as AN important thing to consider. I also noted that "I've seen several good arguments for why the existing IOAM implementation [...] meets the needs for IOAM." I'm not trying to end discussion of the technical characteristics. I'm stating that I believe that it has been well argued that IOAM is mature enough that it is clear that it is sufficiently different from OOAM as to not share the same header. I hope that clarifies my intent. Regards, John On Thu, Apr 19, 2018 at 9:30 AM, Greg Mirsky wrote: > Hi John, > I don't argue with the importance of interoperable implementations (thoug= h > early implementations accept the risk of non-compliance with the final > specification, for example, SFC NSH). At the same time, I don't think tha= t > mere fact of existing implementation should cancel discussion of technica= l > characteristics of the proposed approaches to hybrid OAM. > > Regards, > Greg > > On Thu, Apr 19, 2018 at 9:09 AM, John Lemon > wrote: > >> I never saw a response to the request for a pointer to an OOAM >> implementation, so I assume none exist. >> >> I've seen several good arguments for why the existing IOAM >> implementation, for which several implementations exist, meets the needs >> for IOAM. >> >> I think it is time to put to bed the request to examine merging OOAM and >> IOAM. Let's move forward with IOAM and not hold it up. >> >> Respectfully, John >> >> >> On Thu, Apr 12, 2018 at 11:06 AM, Frank Brockners (fbrockne) < >> fbrockne@cisco.com> wrote: >> >>> Hi Greg, >>> >>> >>> >>> thanks =E2=80=93 and it seems that we=E2=80=99re on the same page with = regards to >>> efficiency (4 bytes of non-required overhead) and maturity (or lack of)= of >>> OOAM. >>> >>> >>> >>> On the IOAM implementation: There are several implementations of IOAM. >>> Some of which have recently been worked on and shown at an IETF hackath= on, >>> see https://datatracker.ietf.org/meeting/100/materials/slides-10 >>> 0-hackathon-sessa-in-situ-oam-ioam - where we=E2=80=99ve shown IPv6 and >>> VXLAN-GPE with IOAM =E2=80=93 on FD.io/VPP as well as on Barefoot Tofin= o. You >>> probably also remember the Netronome/Broadcom demo - >>> https://www.youtube.com/watch?v=3Dj9FbD4a3F4E . >>> >>> Below you seem to be specifically referring to the IOAM open source >>> implementation in FD.io/VPP: There are protocol encapsulations for >>> VXLAN-GPE, NSH, and IPv6 implemented in FD.io/VPP. The current code use= s >>> the =E2=80=9Cnext header approach=E2=80=9D for VXLAN-GPE and it leverag= es MD-Type 2 for >>> NSH. As you=E2=80=99re well aware, there the discussion in SFC whether = to use >>> MD-Type 2 or next header encapsulating IOAM data in NSH isn=E2=80=99t y= et settled, >>> hence we=E2=80=99ll refrain from updating the code until SFC WG has com= e to a >>> conclusion. >>> >>> >>> >>> Could you provide a pointer to an OOAM implementation? >>> >>> >>> >>> Thanks, >>> >>> Frank >>> >>> >>> >>> *From:* Greg Mirsky >>> *Sent:* Donnerstag, 12. April 2018 18:54 >>> *To:* Frank Brockners (fbrockne) >>> *Cc:* IETF IPPM WG ; NVO3 ; Service >>> Function Chaining IETF list ; int-area@ietf.org >>> *Subject:* Re: [ippm] encapsulation of IOAM data in various protocols - >>> follow up from WG discussion in London >>> >>> >>> >>> Hi Frank, >>> >>> thank you for sharing your points. Please find my notes in-line and >>> tagged GIM>>. I believe that this is very much relevant to work of othe= r >>> working groups that directly work on the overlay encapsulations in the >>> center of the discussion and hence I've added them to the list. Hope we= 'll >>> have more opinions to reach the conclusion that is acceptable to all. >>> >>> >>> >>> Regards, >>> >>> Greg >>> >>> >>> >>> On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) < >>> fbrockne@cisco.com> wrote: >>> >>> Back at the IPPM meeting in London, we discussed several drafts dealing >>> with the encapsulation of IOAM data in various protocols >>> (draft-brockners-ippm-ioam-vxlan-gpe-00, draft-brockners-ippm-ioam-gene= ve-00, >>> draft-weis-ippm-ioam-gre-00). One discussion topic that we decided to t= ake >>> to the list was the question on whether draft-ooamdt-rtgwg-ooam-header >>> could be leveraged. After carefully considering >>> draft-ooamdt-rtgwg-ooam-header, I came to the conclusion that the =E2= =80=9COOAM >>> header=E2=80=9D does not meet the needs of IOAM: >>> >>> * Efficiency: IOAM adds data to live user traffic. As such, an >>> encapsulation needs to be as efficient as possible. The =E2=80=9COOAM h= eader=E2=80=9D is 8 >>> bytes long. The approach for IOAM data encapsulation in the above menti= oned >>> drafts only requires 4 bytes. Using the OOAM header approach would add = an >>> unnecessary overhead of 4 bytes =E2=80=93 which is significant. >>> >>> GIM>> The difference in four octets is because OOAM Header: >>> >>> - provides more flexibility, e.g. Flags field and Reserved fields; >>> - supports larger OAM packets than iOAM header; >>> - is future proof by supporting versioning (Version field). >>> >>> * Maturity: IOAM has several implementations, which were also shown at >>> recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting additional= implementations to >>> be publicized soon. Interoperable implementations need timely >>> specifications. Despite the question being asked, the recent thread on = OOAM >>> in the NVO3 list hasn=E2=80=99t revealed any implementation of the OOAM= header. In >>> addition, the thread revealed that several fundamental questions about = the >>> OOAM header are still open, such as whether or how active OAM mechanism= s >>> within protocols such as Geneve would apply to the OOAM header. This >>> ultimately means that we won=E2=80=99t get to a timely specification. >>> >>> GIM>> May I ask which encapsulations supported by the implementations >>> you refer to. Until very recently all iOAM proposals were to use meta-d= ata >>> TLV in, e.g. Geneve and NSH. And if these or some of these implementati= ons >>> already updated to the newly proposed iOAM shim, I don't see problem in >>> making them use OOAM Header. Would you agree? >>> >>> >>> >>> * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM he= ader >>> would ultimately apply to. The way the OOAM header is defined, OOAM use= s a >>> 8-bit field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some pr= otocols that IOAM >>> data needs to be encapsulated into use 16-bits for their next protocol = code >>> points. See e.g. the GRE encapsulation =E2=80=93 as specified in >>> draft-weis-ippm-ioam-gre-00. >>> >>> GIM>> The first paragraph of the Introduction section states: >>> >>> New protocols that support overlay networks like VxLAN-GPE >>> >>> [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve >>> >>> [I-D.ietf-nvo3-geneve], BIER [I-D.ietf-bier-mpls-encapsulation], and >>> >>> NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. >>> >>> Ethernet, IPv4/IPv6, and recognize Operations, Administration, and >>> >>> Maintenance (OAM) as one of distinct types. That ensures that >>> >>> Overlay OAM (OOAM)packets are sharing fate with Overlay data packet >>> >>> traversing the underlay. >>> >>> I'm updating the OOAM Header draft and along with cleaning nits will >>> update reference to GUE. I think that the list and the statemnt are qui= te >>> clear in identifying the scope of networks that may benefit from using = not >>> only common OOAM Header but common OOAM mechanisms, e.g. Echo >>> Request/Reply >>> . >>> >>> >>> >>> With the above in mind, I=E2=80=99d suggest that the WG moves forward w= ith >>> specific definitions for encapsulating IOAM data into protocols =E2=80= =93 per the >>> above mentioned drafts. >>> >>> >>> >>> Regards, Frank >>> >>> >>> _______________________________________________ >>> ippm mailing list >>> ippm@ietf.org >>> https://www.ietf.org/mailman/listinfo/ippm >>> >>> >>> >>> _______________________________________________ >>> ippm mailing list >>> ippm@ietf.org >>> https://www.ietf.org/mailman/listinfo/ippm >>> >>> >> > --001a114a4d0c2cb223056a3b7197 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Greg,

I never stated "that mere fact of existing implementation should cancel d= iscussion of technical characteristics of the proposed approaches to hybrid= OAM". I just noted implementation status as AN important thing= to consider. I also noted that "I've se= en several good arguments for why the existing IOAM implementation [...] me= ets the needs for IOAM." I'm not trying to end discussion o= f the technical characteristics. I'm stating that I believe that it has= been well argued that IOAM=C2=A0is mature enough= =C2=A0that it is clear that it is sufficiently different from OOAM a= s to not share the same header.

I hope that clarif= ies my intent.

Regards, John

<= div class=3D"gmail_extra">
On Thu, Apr 19, 20= 18 at 9:30 AM, Greg Mirsky <gregimirsky@gmail.com> wrote= :
Hi John,
I don'= ;t argue with the importance of interoperable implementations (though early= implementations accept=C2=A0the risk=C2=A0of non-compliance=C2=A0with the = final specification, for=C2=A0example, SFC NSH). At the same time, I don= 9;t think that mere fact of existing implementation should cancel discussio= n of technical characteristics of the proposed approaches to hybrid OAM.

Regards,
Greg

On Thu, Apr 19, 2018 at 9:09 AM, J= ohn Lemon <john.lemon@broadcom.com> wrote:
I never saw a response to the reque= st for a pointer to an OOAM implementation, so I assume none exist.
I've seen several good arguments for why the existing IOAM = implementation, for which several implementations exist, meets the needs fo= r IOAM.

I think it is time to put to bed the reque= st to examine merging OOAM and IOAM. Let's move forward with IOAM and n= ot hold it up.

Respectfully, John


= On Thu, Apr 12, 2018 at 11:06 AM, Frank Brockners (fbrockne) <fbrockne@ci= sco.com> wrote:

Hi Greg,

=C2=A0

thanks =E2=80=93 and i= t seems that we=E2=80=99re on the same page with regards to efficiency (4 b= ytes of non-required overhead) and maturity (or lack of) of OOAM.

=C2=A0

On the IOAM implementa= tion: There are several implementations of IOAM. Some of which have recentl= y been worked on and shown at an IETF hackathon, see https://datatracker.ietf.org/meeting/100/materials/slides-100-hac= kathon-sessa-in-situ-oam-ioam - where we=E2=80=99ve shown IPv6 and= VXLAN-GPE with IOAM =E2=80=93 on FD.io/VPP as well as on Barefoot Tofino. = You probably also remember the Netronome/Broadcom demo - https://www.youtube.com/watch?v=3Dj9FbD4a3F4E .

Below you seem to be s= pecifically referring to the IOAM open source implementation in FD.io/VPP: = There are protocol encapsulations for VXLAN-GPE, NSH, and IPv6 implemented in FD.io/VPP. The current code us= es the =E2=80=9Cnext header approach=E2=80=9D for VXLAN-GPE and it leverage= s MD-Type 2 for NSH. As you=E2=80=99re well aware, there the discussion in = SFC whether to use MD-Type 2 or next header encapsulating IOAM data in NSH isn=E2=80=99t yet settled, hence we=E2=80=99ll refrain fr= om updating the code until SFC WG has come to a conclusion.

=C2=A0

Could you provide a po= inter to an OOAM implementation?

=C2=A0

Thanks,<= /span>

Frank

=C2=A0

From: = Greg Mirsky <= gregimirsky@gmail.com>
Sent: Donnerstag, 12. April 2018 18:54
To: Frank Brockners (fbrockne) <fbrockne@cisco.com>
Cc: IETF IPPM WG <ippm@ietf.org>; NVO3 <nvo3@ietf.org>; Service Function Chaining IETF list <= sfc@ietf.org>; int-area@ietf.org Subject: Re: [ippm] encapsulation of IOAM data in various protocols = - follow up from WG discussion in London

=C2=A0

Hi Frank,

thank you for sharing your points. Please find my no= tes in-line and tagged GIM>>. I believe that this is very much releva= nt to work of other working groups that directly work on the overlay encaps= ulations in the center of the discussion and hence I've added them to the list. Hope we'll have more opinio= ns to reach the conclusion that is acceptable to all.

=C2=A0

Regards,

Greg

=C2=A0

On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (f= brockne) <fbrock= ne@cisco.com> wrote:

Back at the IPPM meeting in Lon= don, we discussed several drafts dealing with the encapsulation of IOAM dat= a in various protocols (draft-brockners-ippm-ioam-vxlan-gpe-00, draft-brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). On= e discussion topic that we decided to take to the list was the question on = whether draft-ooamdt-rtgwg-ooam-header could be leveraged.=C2=A0 After care= fully considering draft-ooamdt-rtgwg-ooam-header, I came to the conclusion that the =E2=80=9COOAM header=E2=80=9D does not m= eet the needs of IOAM:

* Efficiency: IOAM adds data to= live user traffic. As such, an encapsulation needs to be as efficient as p= ossible. The =E2=80=9COOAM header=E2=80=9D is 8 bytes long. The approach for IOAM data encapsulation in the above mentioned drafts only requires 4 = bytes. Using the OOAM header approach would add an unnecessary overhead of = 4 bytes =E2=80=93 which is significant.

GIM>> The difference in four octets is because= OOAM Header:

  • provides more flexibility, e.g. Flags field and Reserved fields;<= /u>
  • supports larger OAM packets than iOAM header;
  • is future proof by supporting versioning (Version field).

* Maturity: IOAM has several im= plementations, which were also shown at recent IETF hackathons =E2=80=93 an= d we=E2=80=99re expecting additional implementations to be publicized soon. Interoperable implementations need timely specifications. Despite th= e question being asked, the recent thread on OOAM in the NVO3 list hasn=E2= =80=99t revealed any implementation of the OOAM header. In addition, the th= read revealed that several fundamental questions about the OOAM header are still open, such as whether or how active OAM me= chanisms within protocols such as Geneve would apply to the OOAM header. Th= is ultimately means that we won=E2=80=99t get to a timely specification.

GIM>> May I ask which encapsulations supported= by the implementations you refer to. Until very recently all iOAM proposal= s were to use meta-data TLV in, e.g. Geneve and NSH. And if these or some o= f these implementations already updated to the newly proposed iOAM shim, I don't see problem in making them us= e OOAM Header. Would you agree?

=C2=A0

* Scope: It isn=E2=80=99t entir= ely clear to which protocols the OOAM header would ultimately apply to. The= way the OOAM header is defined, OOAM uses a 8-bit field for =E2=80=9CNext Prot=E2=80=9D, the next protocol. Some protocols that IOAM d= ata needs to be encapsulated into use 16-bits for their next protocol code = points. See e.g. the GRE encapsulation =E2=80=93 as specified in draft-weis= -ippm-ioam-gre-00.

GIM>> The first paragraph of the Introduction = section states:

=C2=A0 =C2=A0New protocols that support overlay netw= orks like VxLAN-GPE

=C2=A0 =C2=A0[I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.iet= f-nvo3-gue], Geneve

=C2=A0 =C2=A0[I-D.ietf-nvo3-geneve], BIER [I-D.ietf-= bier-mpls-encapsulation], and

=C2=A0 =C2=A0NSH [I-D.ietf-sfc-nsh] support multi-pr= otocol payload, e.g.

=C2=A0 =C2=A0Ethernet, IPv4/IPv6, and recognize Oper= ations, Administration, and

=C2=A0 =C2=A0Maintenance (OAM) as one of distinct ty= pes.=C2=A0 That ensures that

=C2=A0 =C2=A0Overlay OAM (OOAM)packets are sharing f= ate with Overlay data packet

=C2=A0 =C2=A0traversing the underlay.=C2=A0

I'm updating the OOAM Header draft and along wit= h cleaning nits will update reference to GUE. I think that the list and the= statemnt are quite clear in identifying the scope of networks that may ben= efit from using not only common OOAM Header but common OOAM mechanisms, e.g. Echo Request/Reply.

=C2=A0

With the above in mind, I=E2=80= =99d suggest that the WG moves forward with specific definitions for encaps= ulating IOAM data into protocols =E2=80=93 per the above mentioned drafts.<= /span>

=C2=A0

Regards, Frank


_______________________________________________
ippm mailing list
ippm@ietf.org
ht= tps://www.ietf.org/mailman/listinfo/ippm

=C2=A0


_______________________________________________
ippm mailing list
ippm@ietf.org
https://www.ietf.org/mailman/listinfo/ippm




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"Service Function Chaining IETF list" , "int-area@ietf.org" Thread-Topic: [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AdPRe/DslDwu34XkSmq8g6ttV3Kt0QGp44SAAAmXEdD//8c/gP//d7zw Date: Fri, 20 Apr 2018 07:15:51 +0000 Message-ID: References: <81b2598c54944ba887248cbce2f66575@XCH-RCD-008.cisco.com> In-Reply-To: Accept-Language: de-DE, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.55.117.3] Content-Type: multipart/alternative; boundary="_000_a0c168c0c53a4477a1ba3e8a491ff303XCHRCD008ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [ippm] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 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E=Sophos;i="5.49,302,1520899200"; d="scan'208,217";a="101695627" Received: from alln-core-10.cisco.com ([173.36.13.132]) by alln-iport-6.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 20 Apr 2018 19:03:23 +0000 Received: from XCH-RTP-007.cisco.com (xch-rtp-007.cisco.com [64.101.220.147]) by alln-core-10.cisco.com (8.14.5/8.14.5) with ESMTP id w3KJ3Mc3007628 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Fri, 20 Apr 2018 19:03:22 GMT Received: from xch-rtp-020.cisco.com (64.101.220.160) by XCH-RTP-007.cisco.com (64.101.220.147) with Microsoft SMTP Server (TLS) id 15.0.1320.4; Fri, 20 Apr 2018 15:03:21 -0400 Received: from xch-rtp-020.cisco.com ([64.101.220.160]) by XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1320.000; Fri, 20 Apr 2018 15:03:21 -0400 From: "Carlos Pignataro (cpignata)" To: Tom Herbert CC: "Frank Brockners (fbrockne)" , NVO3 , Service Function Chaining IETF list , IETF IPPM WG , Mickey Spiegel , "Shwetha Bhandari (shwethab)" , Tianran Zhou Thread-Topic: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AQHT1en5jaGR0tKoZUqNJvcZ9CCngaQE2SWAgABtMICABQVeAA== Date: Fri, 20 Apr 2018 19:03:21 +0000 Message-ID: References: <8d1b3bb4a1794c4fac3455257e0ab60e@XCH-RCD-008.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.118.116.132] Content-Type: multipart/alternative; boundary="_000_DD4CBF95C04B45ECBC841D85F113230Fciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: 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WG , Mickey Spiegel , "Shwetha Bhandari (shwethab)" , Tianran Zhou Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 21 Apr 2018 15:05:18 -0000 On Fri, Apr 20, 2018 at 12:03 PM, Carlos Pignataro (cpignata) wrote: > Tom, > > On Apr 17, 2018, at 10:22 AM, Tom Herbert wrote: > > On Tue, Apr 17, 2018 at 12:51 AM, Frank Brockners (fbrockne) > wrote: > > > Hi Tianran, > > Tom's note already includes the hint: You'll add IOAM data to the > protocol/layer that you're interested in monitoring. Again using Geneve o= ver > IPv6 as an example: > * If you're interested in the overlay, i.e. Geneve (e.g. timestamping the > packet when it enters and exists the tunnel) - you'd add IOAM data to Gen= eve > * If you're interested in the underlay, i.e. IPv6 (e.g. you'd like to > understand which path packets take in the v6 network) - you'd add IOAM da= ta > to IPv6 > * If you're interested in both, then you'd add IOAM data to Geneve and IP= v6 > > Frank, > > In that case why not just use a hop-by-hop option for measuring the > underlay and a destination option for measuring the overlay? The > advantage is that this works _any_ IP encapsulation method or any IP > protocol for that matter. > > > Because you want to instrument the layer that you want to measure. > Because there=E2=80=99s cases with more unnatural layering where there=E2= =80=99s a desire to > correlate and compare measurements across layers (in a way in which, for > example, the Service layer is tested in a service chaining scenario, not = the > IPv6 hop-by-hop. > Because different topologies expose different Hops and IPv6 HBH goes by t= he > IPv6 node topology. > Because not everything is IPv6, and because you have cases of IPv6 over > something as well. > Those are quick ones that come to mind. > Carlos, Please see my other email that details some use cases that shows destination options are functionally equivalent to ippm in encapsulation, and also my comments that the IPv6 has superior capabilities to cover in-situ ippm requirements (in particular that IP options are the _only_ protocol conformant means for intermediate nodes to change IP payloads needed for IOAM tracing). I don't have a general issue with supporting ippm in encapsulation, but I do think this should be viewed as legacy support. Note there is no concept of segment routing in IPv4, they are blazing forward only on IPv6 so it is reasonable to take this view. Personally, I don't think this is a disadvantage to SR. IPv6 does have more capabilities than IPv4 and we're now seeing protocols that will take advantage of those. Features like this are good motivation for moving to IPv6, which in the long run is good for the Internet! Tom > Frank, > I don't believe adding ippm to every > encapsulation protocol is straightforward: e.g. > draft-brockners-ippm-ioam-geneve describe but notes the limited size > of header, draft-weis-ippm-ioam-gre states that a new EtherType would > be needed just for this purpose. This also entails additional > encapsulation-specific HW support also, whereas support destination > and hbh options could be more generic. > > > Engineering is about trade-offs. If you want to measure Geneve, there are > limitations. But instead of trying to prove why it does not work, I=E2=80= =99ll point > to working demos of where it does =E2=80=94 many of which on different HW= /SW and > encaps, shown at various IETF events. > > Thanks, > > =E2=80=94 Carlos Pignataro > > Tom > > Draft draft-ietf-ippm-ioam-data-02 already mentions layering (see section > 3): > "Layering: If several encapsulation protocols (e.g., in case of tunneling= ) > are stacked on top of each other, IOAM data-records could be present at > every layer. The behavior follows the ships-in-the-night model." > > Given the discussion here, we'll add some additional text in the next > revision to make things crisper (e.g. adding an example might help). > > Frank > > -----Original Message----- > From: Tianran Zhou > Sent: Dienstag, 17. April 2018 03:18 > To: Tom Herbert > Cc: Shwetha Bhandari (shwethab) ; Frank Brockners > (fbrockne) ; Mickey Spiegel > ; NVO3 ; Service Function > Chaining IETF list ; IETF IPPM WG > Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various > protocols - follow up from WG discussion in London > > I think it's better that Frank or Shwetha can explain the multi-layer use > case in detail. > > Tianran > > -----Original Message----- > From: Tom Herbert [mailto:tom@herbertland.com] > Sent: Monday, April 16, 2018 10:40 PM > To: Tianran Zhou > Cc: Shwetha Bhandari (shwethab) ; Frank Brockners > (fbrockne) ; Mickey Spiegel > ; NVO3 ; int-area > ; Service Function Chaining IETF list > ; IETF IPPM WG > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various > protocols - follow up from WG discussion in London > > On Mon, Apr 16, 2018 at 6:31 AM, Tianran Zhou > wrote: > > Hi Shwetha, > > You are talking about the outer encapsution. It is straight forward > for the underlay to record by the header. But what about the > overlay, i.e., inner encapsulation(e.g. geneve)? Without special > configuration, intermediate node will not read the inner header, > hence not be able to process IOAM.e > > > Hi Tianran, > > I believe that is also not protocol conformant. Intermediate nodes > should not be processing transport layer data as this can lead to > misinterpretation and possibly silent data corruption. > > For instance, Geneve is a UDP encapsulation protocol with assigned port > 6081. > In order for an intermediate device to process the Geneve > encapsulation header it would need to look for packets with > destination port of 6081 since that is the only possible > discriminator. However, transport port numbers do not have global > meaning and hosts may use port numbers for other purposes (RFC7605 > describes this). So a packet to port 6081 might be something other > than Geneve and may be misinterpreted. If a misinterpreted packet is chan= ged > (like ippm data is written) then that would be systematic silent data > corruption. > > As far as I know, hop-by-hop options is the only protocol confirming > mechanism that allows an intermediate note to change data of packet in > flight. > Encpasulation is the only conforming mechanism that allows an > intermediate node to add data (like extension headers) to a packet in > flight. > > Tom > > Maybe we are not synced by this overlay/underlay use case. :-) > > Tianran > > > > ________________________________ > Sent from WeLink > > =E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A Shwetha Bhandari (shwethab) > =E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A Tianran Zhou= ;Frank Brockners > (fbrockne);Mickey > Spiegel;Tom > Herbert > =E6=8A=84=E9=80=81=EF=BC=9A NVO3;int-area;Service Function > Chaining IETF list;IETF IPPM WG > =E4=B8=BB=E9=A2=98=EF=BC=9A Re: [ippm] [Int-area] encapsulation of IOAM d= ata in various > protocols - follow up from WG discussion in London > =E6=97=B6=E9=97=B4=EF=BC=9A 2018-04-16 18:17:01 > > Hi Tianran, > > If I recall right, it is not written in the ioam data draft. > > > Data draft is defining the data to be carried in IOAM in an > encapsulation agnostic way, it does not specify how the > encapsulation protocol is configured. > > > > Yes, node by node configuration is an easy way. > > > While it is, it does not have to be a node by node configuration. It > can be part of the encapsulation definition. > > For e.g. If the encapsulation is IPv6 and if we define the data to > be carried as HbH options, then based on the Option Type with > highest order 2 bits set to 00 then the v6 nodes that implement IOAM > will process the option and others will skip over. > > > > > > Thanks, > > Shwetha > > > > From: ippm on behalf of Tianran Zhou > > Date: Monday, April 16, 2018 at 2:36 PM > To: "Frank Brockners (fbrockne)" , Mickey > Spiegel , Tom Herbert > > Cc: NVO3 , "int-area@ietf.org" , > Service Function Chaining IETF list , IETF IPPM WG > > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various > protocols - follow up from WG discussion in London > > > > Hi Frank, > > > > If I recall right, it is not written in the ioam data draft. > > Yes, node by node configuration is an easy way. In the > draft-zhou-ippm-ioam-yang, we have the =E2=80=9Cprotocol-type=E2=80=9D to= indicate > the layering. > > +--rw ioam > > +--rw ioam-profiles > > +--rw enabled? boolean > > +--rw ioam-profile* [profile-name] > > +--rw profile-name string > > +--rw filter > > | +--rw filter-type? ioam-filter-type > > | +--rw acl-name? -> /acl:acls/acl/name > > +--rw protocol-type? ioam-protocol-type > > +--rw incremental-tracing-profile {incremental-trace}? > > | ... > > +--rw preallocated-tracing-profile {preallocated-trace}? > > | ... > > +--rw pot-profile {proof-of-transit}? > > | ... > > +--rw e2e-profile {edge-to-edge}? > > ... > > > > > > Tianran > > From: Frank Brockners (fbrockne) [mailto:fbrockne@cisco.com] > Sent: Monday, April 16, 2018 4:51 PM > To: Tianran Zhou ; Mickey Spiegel > ; Tom Herbert > Cc: NVO3 ; int-area@ietf.org; Service Function > Chaining IETF list ; IETF IPPM WG > Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various > protocols - follow up from WG discussion in London > > > > Hi Tianran, > > > > IOAM is a domain specific feature (see also > draft-ietf-ippm-ioam-data-02 sections 3 and 4), which allows an > operator to control by means of configuration where and for which > traffic IOAM data fields are added/updated/removed from the customer > traffic. Using your example of Geneve over IPv6 =E2=80=93 with IOAM data = in > both the Geneve and the IPv6 protocol, one would expect that the > operator configures the endpoints of the Geneve tunnel to operate on > the IOAM data in Geneve, and the IPv6 routers that the Geneve tunnel > > traverses to operate on the IOAM data in IPv6. > > > > > Frank > > > > From: Tianran Zhou > Sent: Montag, 16. April 2018 10:37 > To: Frank Brockners (fbrockne) ; Mickey Spiegel > ; Tom Herbert > Cc: NVO3 ; int-area@ietf.org; Service Function > Chaining IETF list ; IETF IPPM WG > Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various > protocols - follow up from WG discussion in London > > > > Hi Frank, > > > > How does a forwarder know when and where to insert the data? > > In the case of Geneve over IPv6, do you mean the device need to scan > all the protocol stack? Or just the outer encapsulation? > > > > Tianran > > > > From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Frank > Brockners > (fbrockne) > Sent: Monday, April 16, 2018 3:08 PM > To: Mickey Spiegel ; Tom Herbert > > Cc: NVO3 ; int-area@ietf.org; Service Function > Chaining IETF list ; IETF IPPM WG > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various > protocols - follow up from WG discussion in London > > > > > > Tom, > > > > a quick addition to what Mickey mentioned below: What you seem to > have in mind is what draft-ietf-ippm-ioam-data-02 refers to as =E2=80=9Cl= ayering=E2=80=9D > (see section 3.), i.e. if you=E2=80=99re running for example Geneve over > IPv6, then IOAM data could be encapsulated in both protocols, Geneve > and > IPv6 =E2=80=93 giving you visibility into the =E2=80=9Cunderlay=E2=80=9D = (IPv6) and the =E2=80=9Coverlay=E2=80=9D > > (Geneve). > > > > > Frank > > > > From: ippm On Behalf Of Mickey Spiegel > Sent: Freitag, 13. April 2018 20:22 > To: Tom Herbert > Cc: NVO3 ; int-area@ietf.org; Service Function > Chaining IETF list ; IETF IPPM WG > Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various > protocols - follow up from WG discussion in London > > > > Tom, > > > > On Thu, Apr 12, 2018 at 10:17 PM, Tom Herbert wrote= : > > Mickey, > > Looking at these ippm drafts more closely, I have a much more > fundamental concern. > > In draft-brockners-ippm-ioam-geneve-00 for instance, there is the > text in the introduction: > > "In-situ OAM (IOAM) records OAM information within the packet while > the packet traverses a particular network domain. The term "in-situ" > refers to the fact that the IOAM data fields are added to the data > packets rather than is being sent within packets specifically > dedicated to OAM. This document defines how IOAM data fields are > transported as part of the Geneve [I-D.ietf-nvo3-geneve] > encapsulation." > > I assume this means that as packets with Geneve encapsulation > traverse the network they are interpreted by intermediate nodes as > being Geneve. Since Geneve is a UDP encapsulation, then the > destination UDP port number would be used to identify packets as > being Geneve. So an intermediate device might be looking for UDP > packets destined to port > 6081 (the assigned UDP port for Geneve). If my understanding is > correct, then this is a problem. > > UDP port numbers do not have global meaning. An intermediate device > may very well see UDP packets destined to port 6081 that are not > actually Geneve. This scenario is discussed in RFC7605: > > "...intermediate device interprets traffic based on the port number. > It is important to recognize that any interpretation of port numbers > -- except at the endpoints -- may be incorrect, because port numbers > are meaningful only at the endpoints." > > If the UDP data is modified, as the draft would imply, then > misinterpretation may also mean silent data corruption of packets. A > protocol that would allow this seems pretty incorrect! Note that > this would be true also for any UDP encapsulation that the network > tries to interpret. > > > > The intention is to allow for multiple nodes that a packet traverses > > to be able to insert IOAM node information in the same trace option, > > but leave some flexibility regarding which nodes actually do the > > IOAM processing and the node information. This may vary > > depending on the transport. > > > > In case of a tunneled encapsulation such as Geneve or VXLAN, > > there may still be multiple hops. For example a network may use > > Geneve or VXLAN, but only do L2 processing at ToRs, with L3 > > processing done at aggregation or core switches. In this case > > many packets would do 2 Geneve or VXLAN hops, so the packet > > would contain IOAM node information from two nodes. > > > > Another example is service function chaining using Geneve or > > VXLAN rather than NSH. > > > > > I am also wondering if hop-by-hop options been considered for this > application? Their interpretation in the network is unabiguous and > they also have the advantage that the work with any IP protocol or > encapsulation. > > > > IPv6 hop-by-hop options has been considered. See > > draft-brockners-inband-oam-transport-05. This has not yet been > > broken out into a separate draft. > > > > Mickey > > > > > Thanks, > Tom > > > On Thu, Apr 12, 2018 at 3:31 PM, Mickey Spiegel > wrote: > > Tom, > > On Thu, Apr 12, 2018 at 2:46 PM, Tom Herbert wrote: > > > On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky > > wrote: > > Hi Frank, > thank you for sharing your points. Please find my notes in-line > and tagged > GIM>>. I believe that this is very much relevant to work of > GIM>>other > working > groups that directly work on the overlay encapsulations in the > center of the discussion and hence I've added them to the list. > Hope we'll have more opinions to reach the conclusion that is > acceptable to all. > > Regards, > Greg > > On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) > wrote: > > > Back at the IPPM meeting in London, we discussed several drafts > dealing with the encapsulation of IOAM data in various > protocols (draft-brockners-ippm-ioam-vxlan-gpe-00, > draft-brockners-ippm-ioam-geneve-00, > draft-weis-ippm-ioam-gre-00). One discussion topic that we > decided to take to the list was the question on whether > draft-ooamdt-rtgwg-ooam-header could be leveraged.. After > carefully considering draft-ooamdt-rtgwg-ooam-header, I came to > the conclusion that the =E2=80=9COOAM header=E2=80=9D does not meet the n= eeds > of > IOAM: > > * Efficiency: IOAM adds data to live user traffic. As such, an > encapsulation needs to be as efficient as possible. The =E2=80=9COOAM hea= der=E2=80=9D > is 8 > bytes long. The approach for IOAM data encapsulation in the > above mentioned drafts only requires 4 bytes. Using the OOAM > header approach would add an unnecessary overhead of 4 bytes =E2=80=93 > which is significant. > > Greg, > > I'm missing something here. I looked at the drafts you referenced > and each of them looks like the overhead for OAM is greater that > four bytes. In each there is some overhead equivalent to > type/length, for instance in Geneve four bytes are needed for > option class, type, and length. Unless the the OAM data is zero > length, I don't see how this adds up to only four bytes of overhead. > > > > The four versus eight bytes just refers to the fields in the four > bytes of IOAM info, that is common to all IOAM options. Beyond > that, there are IOAM option specific fields. For example if doing > one of the IOAM trace options, there are four bytes of trace option > header, including the IOAM-trace-type, NodeLen, Flags, and > RemainingLen fields. These are followed by the node data list > containing the per hop IOAM information. > > In looking at the OOAM header content, it has nothing to do with > any of the IOAM information after the first four bytes. It contains > another variant of the information in the first four bytes of IOAM > info, spread out over eight bytes. > > > Tom > > > GIM>> The difference in four octets is because OOAM Header: > > provides more flexibility, e.g. Flags field and Reserved fields; > > > > The flags field only has one defined flag at the moment, for a > timestamp block. For IOAM trace we need per hop timestamps, which > the timestamp block cannot address, i.e. the timestamp block is > redundant for > > IOAM. > > > > supports larger OAM packets than iOAM header; > > > > For IOAM purposes, 1020 octets is more than enough. > > > is future proof by supporting versioning (Version field). > > > > IMO, taking the first two bits of the IOAM-Type to define a Version > field would be a good thing. This does not require adding four more > bytes of overhead. 64 IOAM-Types is more than enough. > > > > * Maturity: IOAM has several implementations, which were also > shown at recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting > additional implementations to be publicized soon. Interoperable > implementations need timely specifications. Despite the > question being asked, the recent thread on OOAM in the NVO3 > list hasn=E2=80=99t revealed any implementation of the OOAM header. > In > addition, the thread revealed that several fundamental > questions about the OOAM header are still open, such as whether > or how active OAM mechanisms within protocols such as Geneve > would apply to the OOAM header. This ultimately means that we > won=E2=80=99t get to a timely specification. > > > GIM>> May I ask which encapsulations supported by the > GIM>> implementations > you > refer to. Until very recently all iOAM proposals were to use > meta-data TLV in, e.g. Geneve and NSH. And if these or some of > these implementations already updated to the newly proposed iOAM > shim, I don't see problem in making them use OOAM Header. Would > you agree? > > > * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM > header would ultimately apply to. The way the OOAM header is > defined, OOAM uses a 8-bit field for =E2=80=9CNext Prot=E2=80=9D, the nex= t > protocol. Some protocols that IOAM data needs to be > encapsulated into use 16-bits for their next protocol code points. See e.= g. > the GRE encapsulation =E2=80=93 as specified in > draft-weis-ippm-ioam-gre-00. > > > GIM>> The first paragraph of the Introduction section states: > New protocols that support overlay networks like VxLAN-GPE > [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve > [I-D.ietf-nvo3-geneve], BIER > [I-D.ietf-bier-mpls-encapsulation], > > and > > NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. > Ethernet, IPv4/IPv6, and recognize Operations, Administration, and > Maintenance (OAM) as one of distinct types. That ensures that > Overlay OAM (OOAM)packets are sharing fate with Overlay data packet > traversing the underlay. > I'm updating the OOAM Header draft and along with cleaning nits > will update reference to GUE. I think that the list and the > statemnt are quite clear in identifying the scope of networks > that may benefit from using not only common OOAM Header but > common OOAM mechanisms, e.g. Echo Request/Reply. > > With the above in mind, I=E2=80=99d suggest that the WG moves forward > with specific definitions for encapsulating IOAM data into > protocols =E2=80=93 per the above mentioned drafts. > > > > Regards, Frank > > > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://www.ietf.org/mailman/listinfo/ippm > > > > _______________________________________________ > Int-area mailing list > Int-area@ietf.org > https://www.ietf.org/mailman/listinfo/int-area > > > _______________________________________________ > ippm mailing list > ippm@ietf.org > https://www.ietf.org/mailman/listinfo/ippm > > > > > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > > From nobody Sat Apr 21 20:23:52 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3E65112D958; Sat, 21 Apr 2018 20:23:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.649 X-Spam-Level: X-Spam-Status: No, score=-1.649 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001] autolearn=no 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 dR7U3xrhZTXl; Sat, 21 Apr 2018 20:23:47 -0700 (PDT) Received: from smtp3.execulink.net (smtp3.execulink.net [69.63.44.84]) (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 5C3B0126B7E; Sat, 21 Apr 2018 20:23:47 -0700 (PDT) Received: from 224-216.speede.golden.net ([216.59.224.216] helo=[192.168.123.13]) by smtp3.execulink.net with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.89) (envelope-from ) id 1fA5bN-00038z-J1; Sat, 21 Apr 2018 23:23:46 -0400 From: Dave Dolson To: Martin Vigoureux , draft-ietf-sfc-hierarchical@ietf.org Cc: sarikaya@ieee.org, "sfc-chairs@ietf.org" , sfc@ietf.org References: <49f64a48-cd4c-db01-7741-66f6c613c77d@nokia.com> Message-ID: <31459972-303b-004d-2b8d-2138916876d3@golden.net> Date: Sat, 21 Apr 2018 23:23:44 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <49f64a48-cd4c-db01-7741-66f6c613c77d@nokia.com> Content-Type: multipart/alternative; boundary="------------1FF2099E06219B59EF26ABFB" Content-Language: en-US Archived-At: Subject: Re: [sfc] AD review for draft-ietf-sfc-hierarchical-07 X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 22 Apr 2018 03:23:51 -0000 This is a multi-part message in MIME format. --------------1FF2099E06219B59EF26ABFB Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Martin, Thank you for the careful review. My comments below are as an individual contributor. As an editor, I welcome feedback from the working group. -Dave On 2018-04-10 6:11 AM, Martin Vigoureux wrote: > Hello, > > I have reviewed this document, thanks to all of you for putting it > together. Please see my comments below. > > Thank you > -m > > > General: > I am in two minds about this document and maybe because the document > itself seems to not have clear intent. > > It is not clear whether this is simply describing what could be done > or prescribing what should be done. I take the fact that this is an > Informational document as leaning towards "description" but there are > pieces of text which clearly look like prescriptive > protocol/functional behaviour (although some are not detailed enough > to allow for an implementation). > > I would really appreciate if the objective of this document could be > clarified so that the reader knows what to expect. As an original author, my intention was to show a network architecture that allows SFC to scale. Hence it would be informational and optional. We could make that explicit in the introduction and abstract. > > Also, I am not advocating for making this a Standard Track document as > I believe it would require a lot of rework but on the other hand I am > not sure how much help it provides to the persons that would want to > use the concept of hierarchy when deploying SFC in a large domain, nor > to those that would need to implement it before that. You'll find > specific comments below but that bigger question remains. > > Also, the Shepherd write-up does not seem to follow the template. > Any reason for that? I'd prefer if it was re-written according to the > template. Thanks. > > > Specific: > Header: > please write the submission date in the correct format Agreed. > > 1. Introduction >    Service Function Chaining (SFC) is a technique for prescribing >    differentiated traffic forwarding policies within an SFC-enabled >    domain. > I am concerned by the fact that this document seems to give another > definition to SFC. I'm not saying this is wrong but I'd be much more > comfortable if it was simply saying: > >    The SFC architecture is described in detail in [RFC7665], and is not >    repeated here. This document simply uses that architecture. > > >    We assume that some Service Function Paths (SFPs) need to be selected >    on the basis of application-specific data visible to the network > What are the security implications of this assumption? Can we remove > that? I think SFC has had it's share of security related discussions. I think that can be changed to We assume that some Service Function Paths (SFPs) need to be selected on the basis of transport-layer coordinates. > >    So instead of considering a single SFC Control Plane ([I-D.ietf- >    sfc-control-plane]) > I'd prefer not to reference a document which has been abandoned by the WG I propose leaving the discussion of control plane, and just removing the document references. > >    Decomposing a network into multiple SFC-enabled domains should permit >    end-to-end visibility of SFs and SFPs. > Is that a wishful outcome or a requirement? I'm not sure myself what that means. I think it can be removed. > >    The criteria for decomposing a domain into multiple SFC-enabled >    sub-domains are beyond the scope of this document.  These criteria >    are deployment-specific. > While I understand this statement, it kind of defeats a good part of > the purpose of the document, doesn't it? I think the idea is that there are lots of ways one could divide functions into different sub-domains. We don't want to tell the operator why they would want to do different things, just explain the tools available. Like explaining a programming language without trying to explain all of the programs one could write... > > > 2.  Hierarchical Service Function Chaining (hSFC) > >    A hierarchy has multiple levels: the top-most level encompasses the >    entire network domain to be managed, and lower levels encompass >    portions of the network.  These levels are discussed in the following >    sub-sections. > Should it always be like that or is that just a way and there could be > other ways? Can we have more-than-two-levels hierarchies or should > they all be top-and-lower? Should it always be like that? Hierarchical is optional, if that's what you mean. I think "multiple levels" means more than two are possible. In a hierarchy the higher levels are more encompassing... I don't think I understand your concern. > > 2.1.  Top Level > This section describes at length the figure/example but what are the > take-aways? > >    Considering the example depicted in Figure 1, a top-level network >    domain includes SFC data plane components distributed over a wide >    area, including: > >    o  Classifiers (CFs), >    o  Service Function Forwarders (SFFs) and >    o  Sub-domains. > Is that an illustrative way to partition the components (e.g., CFs and > SFFs part of the top-level) or is that the recommended way? There would need to be CFs and SFFs at each level. Maybe I miss your point. > >    We expect the system to include a top-level control plane having >    responsibility for configuring forwarding policies and traffic >    classification rules (see for example, [I-D.ietf-sfc-control-plane]). > again, I'd prefer not to reference this doc. More generally, is that > needed? I don't think so. We can remove the reference. > > 2.2.  Lower Levels > Same general comment than 2.1. Also, in this section you largely > discuss the IBN, which is in fact only introduced after. The IBN is introduced here, and explained in greater detail in a later section. > > 3.  Internal Boundary Node (IBN) > This is the core of the proposal, in my opinion, but it comes very > late in the document. If you don't want to rearchitect the whole > document you should at least have some text (a sentence at bare > minimum) early in the document that says something like : >    we introduce the concept of an IBN which acts as the gateway between >    the levels of the hierarchy. We also discuss the options for >    realizing this function. Thanks. I think we can add this to the introduction. > > 3.1.x > Is there a recommended way of doing IBN Path Configuration out of the > 5 listed? We did not take any such conclusion. > > > 4.  Sub-domain Classifier >    Another goal of the hierarchical approach is to simplify the >    mechanisms of scaling in and scaling out SFs.  All of the >    complexities of load-balancing among multiple SFs can be handled >    within a sub-domain, under control of the classifier, allowing the >    higher-level domain to be oblivious to the existence of multiple SF >    instances. > I don't see the simplification here. You hide the complexity to the > higher level, but it remains in the lower one, doesn't it? If there are multiple sub-domains, they can each be managed independently, each dealing with a subset of the complexity. If the deployment were flat, a single controller would have to manage scaling of multiple clusters. So it is simpler in the scope handled by each controller. > > > 9.1 > Please remove: >    Generic security considerations related to the control plane are >    discussed in [I-D.ietf-sfc-control-plane].  These considerations >    apply for both high-level and low-level domains. > OK > > > Nits: > s/NSH [RFC8300]  or a similar/NSH [RFC8300] or a similar/ If you are complaining about the extra space, this is a function of the XML-->TXT rendering. The XML is "NSH or a similar" > >    One path is shown from edge classifier to SFF1 to Sub-domain#1 >    (residing in data-center1) to SFF1 to SFF2 (residing in data-center >    2) to Sub-domain#2 to SFF2 to network egress. > Shouldn't this text be taken out of the figure and integrated in the > body of the doc? OK > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc --------------1FF2099E06219B59EF26ABFB Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit

Martin,

Thank you for the careful review.

My comments below are as an individual contributor.

As an editor, I welcome feedback from the working group.

-Dave


On 2018-04-10 6:11 AM, Martin Vigoureux wrote:
Hello,

I have reviewed this document, thanks to all of you for putting it together. Please see my comments below.

Thank you
-m


General:
I am in two minds about this document and maybe because the document itself seems to not have clear intent.

It is not clear whether this is simply describing what could be done or prescribing what should be done. I take the fact that this is an Informational document as leaning towards "description" but there are pieces of text which clearly look like prescriptive protocol/functional behaviour (although some are not detailed enough to allow for an implementation).

I would really appreciate if the objective of this document could be clarified so that the reader knows what to expect.
As an original author, my intention was to show a network architecture that allows SFC to scale. Hence it would be informational and optional. We could make that explicit in the introduction and abstract.


Also, I am not advocating for making this a Standard Track document as I believe it would require a lot of rework but on the other hand I am not sure how much help it provides to the persons that would want to use the concept of hierarchy when deploying SFC in a large domain, nor to those that would need to implement it before that. You'll find specific comments below but that bigger question remains.

Also, the Shepherd write-up does not seem to follow the template.
Any reason for that? I'd prefer if it was re-written according to the template. Thanks.


Specific:
Header:
please write the submission date in the correct format
Agreed.


1. Introduction
   Service Function Chaining (SFC) is a technique for prescribing
   differentiated traffic forwarding policies within an SFC-enabled
   domain.
I am concerned by the fact that this document seems to give another definition to SFC. I'm not saying this is wrong but I'd be much more comfortable if it was simply saying:

   The SFC architecture is described in detail in [RFC7665], and is not
   repeated here. This document simply uses that architecture.


   We assume that some Service Function Paths (SFPs) need to be selected
   on the basis of application-specific data visible to the network
What are the security implications of this assumption? Can we remove that? I think SFC has had it's share of security related discussions.
I think that can be changed to 
   We assume that
   some Service Function Paths (SFPs) need to be selected on the basis
   of transport-layer coordinates.

   So instead of considering a single SFC Control Plane ([I-D.ietf-
   sfc-control-plane])
I'd prefer not to reference a document which has been abandoned by the WG
I propose leaving the discussion of control plane, and just removing the document references.


   Decomposing a network into multiple SFC-enabled domains should permit
   end-to-end visibility of SFs and SFPs.
Is that a wishful outcome or a requirement?
I'm not sure myself what that means. I think it can be removed.

   The criteria for decomposing a domain into multiple SFC-enabled
   sub-domains are beyond the scope of this document.  These criteria
   are deployment-specific.
While I understand this statement, it kind of defeats a good part of the purpose of the document, doesn't it?
I think the idea is that there are lots of ways one could divide functions into different sub-domains. We don't want to tell the operator why they would want to do different things, just explain the tools available. Like explaining a programming language without trying to explain all of the programs one could write...



2.  Hierarchical Service Function Chaining (hSFC)

   A hierarchy has multiple levels: the top-most level encompasses the
   entire network domain to be managed, and lower levels encompass
   portions of the network.  These levels are discussed in the following
   sub-sections.
Should it always be like that or is that just a way and there could be other ways? Can we have more-than-two-levels hierarchies or should they all be top-and-lower?
Should it always be like that? Hierarchical is optional, if that's what you mean.
I think "multiple levels" means more than two are possible.
In a hierarchy the higher levels are more encompassing... I don't think I understand your concern.


2.1.  Top Level
This section describes at length the figure/example but what are the take-aways?

   Considering the example depicted in Figure 1, a top-level network
   domain includes SFC data plane components distributed over a wide
   area, including:

   o  Classifiers (CFs),
   o  Service Function Forwarders (SFFs) and
   o  Sub-domains.
Is that an illustrative way to partition the components (e.g., CFs and SFFs part of the top-level) or is that the recommended way?
There would need to be CFs and SFFs at each level. Maybe I miss your point.


   We expect the system to include a top-level control plane having
   responsibility for configuring forwarding policies and traffic
   classification rules (see for example, [I-D.ietf-sfc-control-plane]).
again, I'd prefer not to reference this doc. More generally, is that needed? I don't think so.
We can remove the reference.


2.2.  Lower Levels
Same general comment than 2.1. Also, in this section you largely discuss the IBN, which is in fact only introduced after.
The IBN is introduced here, and explained in greater detail in a later section.


3.  Internal Boundary Node (IBN)
This is the core of the proposal, in my opinion, but it comes very late in the document. If you don't want to rearchitect the whole document you should at least have some text (a sentence at bare minimum) early in the document that says something like :
   we introduce the concept of an IBN which acts as the gateway between
   the levels of the hierarchy. We also discuss the options for
   realizing this function.
Thanks. I think we can add this to the introduction.

3.1.x
Is there a recommended way of doing IBN Path Configuration out of the 5 listed?
We did not take any such conclusion.



4.  Sub-domain Classifier
   Another goal of the hierarchical approach is to simplify the
   mechanisms of scaling in and scaling out SFs.  All of the
   complexities of load-balancing among multiple SFs can be handled
   within a sub-domain, under control of the classifier, allowing the
   higher-level domain to be oblivious to the existence of multiple SF
   instances.
I don't see the simplification here. You hide the complexity to the higher level, but it remains in the lower one, doesn't it?
If there are multiple sub-domains, they can each be managed independently, each dealing with a subset of the complexity. If the deployment were flat, a single controller would have to manage scaling of multiple clusters.
So it is simpler in the scope handled by each controller.



9.1
Please remove:
   Generic security considerations related to the control plane are
   discussed in [I-D.ietf-sfc-control-plane].  These considerations
   apply for both high-level and low-level domains.

OK


Nits:
s/NSH [RFC8300]  or a similar/NSH [RFC8300] or a similar/
If you are complaining about the extra space, this is a function of the XML-->TXT rendering.
The XML is "<xref target="RFC8300">NSH</xref> or a similar"


   One path is shown from edge classifier to SFF1 to Sub-domain#1
   (residing in data-center1) to SFF1 to SFF2 (residing in data-center
   2) to Sub-domain#2 to SFF2 to network egress.
Shouldn't this text be taken out of the figure and integrated in the body of the doc?
OK

_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.ietf.org/mailman/listinfo/sfc

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with mapi id 15.00.1320.000; Sun, 22 Apr 2018 05:21:25 -0400 From: "Carlos Pignataro (cpignata)" To: Tom Herbert CC: "Frank Brockners (fbrockne)" , NVO3 , Service Function Chaining IETF list , IETF IPPM WG , Mickey Spiegel , "Shwetha Bhandari (shwethab)" , Tianran Zhou Thread-Topic: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AQHT1en5jaGR0tKoZUqNJvcZ9CCngaQE2SWAgABtMICABQVeAIABT8mAgADvQ2k= Date: Sun, 22 Apr 2018 09:21:25 +0000 Message-ID: References: <8d1b3bb4a1794c4fac3455257e0ab60e@XCH-RCD-008.cisco.com> , In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 22 Apr 2018 09:21:32 -0000 SGkgVG9tLA0KDQpJIGFncmVlIHRoYXQgdXNpbmcgSU9BTSBpbiBJUHY2IGJvdGggZTJlIGFuZCBo YmggaXMgYSBwb3dlcmZ1bCBhbmQgdXNlZnVsIGNvbWJvIQ0KDQpNeSBwb2ludCwgc29ycnkgaWYg SSB3YXMgbm90IGNsZWFyLCBpcyB0aGF0IGFuIOKAnFNGQyBIb3DigJ0gZG9lcyBub3QgY29ycmVz cG9uZCB0byBhIHRyYW5zcG9ydCBlbmNhcHN1bGF0aW9uIGhvcCwgYW5kIHRoYXQgSU9BTSBjYW4g YmUgaW4tc2l0deKAmWVkIHRvIHRoZSBlbmNhcHN1bGF0aW9uIHRoYXQgcmVhbGl6ZXMgdGhlIChz ZXJ2aWNlLCBvdmVybGF5LCBvdGhlcndpc2UgaGlnaGVyKSB0b3BvbG9neSAod2hpY2ggY2FuIGJl IElQdjYgbmF0aXZlbHkgb3Igc29tZXRoaW5nIGVsc2UgYXMgd2VsbCkNCg0KVGhhbmtzLA0KDQpU aHVtYiB0eXBlZCBieSBDYXJsb3MgUGlnbmF0YXJvLg0KRXhjdXplIHR5cG9mcmFwaGljYWsgZXJy b3dzDQoNCj4gT24gQXByIDIxLCAyMDE4LCBhdCAxMTowNSwgVG9tIEhlcmJlcnQgPHRvbUBoZXJi ZXJ0bGFuZC5jb20+IHdyb3RlOg0KPiANCj4gT24gRnJpLCBBcHIgMjAsIDIwMTggYXQgMTI6MDMg 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Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=herbertland-com.20150623.gappssmtp.com 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 LdxTGD7t1XmX for ; Sun, 22 Apr 2018 09:28:23 -0700 (PDT) Received: from mail-qk0-x236.google.com (mail-qk0-x236.google.com [IPv6:2607:f8b0:400d:c09::236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3CEA5126C0F for ; Sun, 22 Apr 2018 09:28:20 -0700 (PDT) Received: by mail-qk0-x236.google.com with SMTP id b131so9455504qkg.2 for ; Sun, 22 Apr 2018 09:28:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=herbertland-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=JTOIFCqmkgiG8pDvzmxbBUM5TVp11pSk3cbt0YqmDKg=; 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ALQs6tChpqw3sUKJ7G7LNR3iHQXd9buJuf27V9WMwl36PEXfWbIC/ZKr KIPuODkfifcH5ebbVlEQixQCm2aqZ/KlIQR6uH4xWA== X-Google-Smtp-Source: AB8JxZpaxLex/5ND69a72N7GJeYtDE928Ldx+q2Z3QDcUqlI+2QlZqDT4Ts01jYxN0ocANuRb00t9xw5pxpRda3cOT4= X-Received: by 10.55.194.13 with SMTP id i13mr10705374qkm.311.1524414498953; Sun, 22 Apr 2018 09:28:18 -0700 (PDT) MIME-Version: 1.0 Received: by 10.237.48.35 with HTTP; Sun, 22 Apr 2018 09:28:18 -0700 (PDT) In-Reply-To: References: <8d1b3bb4a1794c4fac3455257e0ab60e@XCH-RCD-008.cisco.com> From: Tom Herbert Date: Sun, 22 Apr 2018 09:28:18 -0700 Message-ID: To: "Carlos Pignataro (cpignata)" Cc: "Frank Brockners (fbrockne)" , NVO3 , Service Function Chaining IETF list , IETF IPPM WG , Mickey Spiegel , "Shwetha Bhandari (shwethab)" , Tianran Zhou Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 22 Apr 2018 16:28:28 -0000 On Sun, Apr 22, 2018 at 2:21 AM, Carlos Pignataro (cpignata) wrote: > Hi Tom, > > I agree that using IOAM in IPv6 both e2e and hbh is a powerful and useful= combo! > > My point, sorry if I was not clear, is that an =E2=80=9CSFC Hop=E2=80=9D = does not correspond to a transport encapsulation hop, and that IOAM can be = in-situ=E2=80=99ed to the encapsulation that realizes the (service, overlay= , otherwise higher) topology (which can be IPv6 natively or something else = as well) > Carlos, AFACT, the intent is that nodes along the path of a packet containing in-situ ippm data may modify the ippm data as described in draft-ietf-ippm-ioam-data. Your comment confirms my belief that part of the intent is that intermediate nodes, specifically nodes that are not addressed by the destination address of a packet, may also modify ippm data. If this is correct, then I understand how this process could work correctly with hop-by-hop options. However, I don't understand how this can work correclty with encapsulation where the ippm data is within the encapsulation. IP has no allowance for intermediate nodes to modify transport payloads. For example, if UDP payloads are being modified in the network, then this introduces the possibility of silent corruption when the port number is misinterpreted. Thanks, Tom > Thanks, > > Thumb typed by Carlos Pignataro. > Excuze typofraphicak errows > >> On Apr 21, 2018, at 11:05, Tom Herbert wrote: >> >> On Fri, Apr 20, 2018 at 12:03 PM, Carlos Pignataro (cpignata) >> wrote: >>> Tom, >>> >>> On Apr 17, 2018, at 10:22 AM, Tom Herbert wrote: >>> >>> On Tue, Apr 17, 2018 at 12:51 AM, Frank Brockners (fbrockne) >>> wrote: >>> >>> >>> Hi Tianran, >>> >>> Tom's note already includes the hint: You'll add IOAM data to the >>> protocol/layer that you're interested in monitoring. Again using Geneve= over >>> IPv6 as an example: >>> * If you're interested in the overlay, i.e. Geneve (e.g. timestamping t= he >>> packet when it enters and exists the tunnel) - you'd add IOAM data to G= eneve >>> * If you're interested in the underlay, i.e. IPv6 (e.g. you'd like to >>> understand which path packets take in the v6 network) - you'd add IOAM = data >>> to IPv6 >>> * If you're interested in both, then you'd add IOAM data to Geneve and = IPv6 >>> >>> Frank, >>> >>> In that case why not just use a hop-by-hop option for measuring the >>> underlay and a destination option for measuring the overlay? The >>> advantage is that this works _any_ IP encapsulation method or any IP >>> protocol for that matter. >>> >>> >>> Because you want to instrument the layer that you want to measure. >>> Because there=E2=80=99s cases with more unnatural layering where there= =E2=80=99s a desire to >>> correlate and compare measurements across layers (in a way in which, fo= r >>> example, the Service layer is tested in a service chaining scenario, no= t the >>> IPv6 hop-by-hop. >>> Because different topologies expose different Hops and IPv6 HBH goes by= the >>> IPv6 node topology. >>> Because not everything is IPv6, and because you have cases of IPv6 over >>> something as well. >>> Those are quick ones that come to mind. >>> >> Carlos, >> >> Please see my other email that details some use cases that shows >> destination options are functionally equivalent to ippm in >> encapsulation, and also my comments that the IPv6 has superior >> capabilities to cover in-situ ippm requirements (in particular that IP >> options are the _only_ protocol conformant means for intermediate >> nodes to change IP payloads needed for IOAM tracing). >> >> I don't have a general issue with supporting ippm in encapsulation, >> but I do think this should be viewed as legacy support. Note there is >> no concept of segment routing in IPv4, they are blazing forward only >> on IPv6 so it is reasonable to take this view. Personally, I don't >> think this is a disadvantage to SR. IPv6 does have more capabilities >> than IPv4 and we're now seeing protocols that will take advantage of >> those. Features like this are good motivation for moving to IPv6, >> which in the long run is good for the Internet! >> >> Tom >> >>> Frank, >>> I don't believe adding ippm to every >>> encapsulation protocol is straightforward: e.g. >>> draft-brockners-ippm-ioam-geneve describe but notes the limited size >>> of header, draft-weis-ippm-ioam-gre states that a new EtherType would >>> be needed just for this purpose. This also entails additional >>> encapsulation-specific HW support also, whereas support destination >>> and hbh options could be more generic. >>> >>> >>> Engineering is about trade-offs. If you want to measure Geneve, there a= re >>> limitations. But instead of trying to prove why it does not work, I=E2= =80=99ll point >>> to working demos of where it does =E2=80=94 many of which on different = HW/SW and >>> encaps, shown at various IETF events. >>> >>> Thanks, >>> >>> =E2=80=94 Carlos Pignataro >>> >>> Tom >>> >>> Draft draft-ietf-ippm-ioam-data-02 already mentions layering (see secti= on >>> 3): >>> "Layering: If several encapsulation protocols (e.g., in case of tunneli= ng) >>> are stacked on top of each other, IOAM data-records could be present at >>> every layer. The behavior follows the ships-in-the-night model." >>> >>> Given the discussion here, we'll add some additional text in the next >>> revision to make things crisper (e.g. adding an example might help). >>> >>> Frank >>> >>> -----Original Message----- >>> From: Tianran Zhou >>> Sent: Dienstag, 17. April 2018 03:18 >>> To: Tom Herbert >>> Cc: Shwetha Bhandari (shwethab) ; Frank Brockners >>> (fbrockne) ; Mickey Spiegel >>> ; NVO3 ; Service Function >>> Chaining IETF list ; IETF IPPM WG >>> Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various >>> protocols - follow up from WG discussion in London >>> >>> I think it's better that Frank or Shwetha can explain the multi-layer u= se >>> case in detail. >>> >>> Tianran >>> >>> -----Original Message----- >>> From: Tom Herbert [mailto:tom@herbertland.com] >>> Sent: Monday, April 16, 2018 10:40 PM >>> To: Tianran Zhou >>> Cc: Shwetha Bhandari (shwethab) ; Frank Brockners >>> (fbrockne) ; Mickey Spiegel >>> ; NVO3 ; int-area >>> ; Service Function Chaining IETF list >>> ; IETF IPPM WG >>> Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various >>> protocols - follow up from WG discussion in London >>> >>> On Mon, Apr 16, 2018 at 6:31 AM, Tianran Zhou >>> wrote: >>> >>> Hi Shwetha, >>> >>> You are talking about the outer encapsution. It is straight forward >>> for the underlay to record by the header. But what about the >>> overlay, i.e., inner encapsulation(e.g. geneve)? Without special >>> configuration, intermediate node will not read the inner header, >>> hence not be able to process IOAM.e >>> >>> >>> Hi Tianran, >>> >>> I believe that is also not protocol conformant. Intermediate nodes >>> should not be processing transport layer data as this can lead to >>> misinterpretation and possibly silent data corruption. >>> >>> For instance, Geneve is a UDP encapsulation protocol with assigned port >>> 6081. >>> In order for an intermediate device to process the Geneve >>> encapsulation header it would need to look for packets with >>> destination port of 6081 since that is the only possible >>> discriminator. However, transport port numbers do not have global >>> meaning and hosts may use port numbers for other purposes (RFC7605 >>> describes this). So a packet to port 6081 might be something other >>> than Geneve and may be misinterpreted. If a misinterpreted packet is ch= anged >>> (like ippm data is written) then that would be systematic silent data >>> corruption. >>> >>> As far as I know, hop-by-hop options is the only protocol confirming >>> mechanism that allows an intermediate note to change data of packet in >>> flight. >>> Encpasulation is the only conforming mechanism that allows an >>> intermediate node to add data (like extension headers) to a packet in >>> flight. >>> >>> Tom >>> >>> Maybe we are not synced by this overlay/underlay use case. :-) >>> >>> Tianran >>> >>> >>> >>> ________________________________ >>> Sent from WeLink >>> >>> =E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A Shwetha Bhandari (shwethab) >>> =E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A Tianran Zhou;Frank Brockners >>> (fbrockne);Mickey >>> Spiegel;Tom >>> Herbert >>> =E6=8A=84=E9=80=81=EF=BC=9A NVO3;int-area;Service Function >>> Chaining IETF list;IETF IPPM WG >>> =E4=B8=BB=E9=A2=98=EF=BC=9A Re: [ippm] [Int-area] encapsulation of IOAM= data in various >>> protocols - follow up from WG discussion in London >>> =E6=97=B6=E9=97=B4=EF=BC=9A 2018-04-16 18:17:01 >>> >>> Hi Tianran, >>> >>> If I recall right, it is not written in the ioam data draft. >>> >>> >>> Data draft is defining the data to be carried in IOAM in an >>> encapsulation agnostic way, it does not specify how the >>> encapsulation protocol is configured. >>> >>> >>> >>> Yes, node by node configuration is an easy way. >>> >>> >>> While it is, it does not have to be a node by node configuration. It >>> can be part of the encapsulation definition. >>> >>> For e.g. If the encapsulation is IPv6 and if we define the data to >>> be carried as HbH options, then based on the Option Type with >>> highest order 2 bits set to 00 then the v6 nodes that implement IOAM >>> will process the option and others will skip over. >>> >>> >>> >>> >>> >>> Thanks, >>> >>> Shwetha >>> >>> >>> >>> From: ippm on behalf of Tianran Zhou >>> >>> Date: Monday, April 16, 2018 at 2:36 PM >>> To: "Frank Brockners (fbrockne)" , Mickey >>> Spiegel , Tom Herbert >>> >>> Cc: NVO3 , "int-area@ietf.org" , >>> Service Function Chaining IETF list , IETF IPPM WG >>> >>> Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various >>> protocols - follow up from WG discussion in London >>> >>> >>> >>> Hi Frank, >>> >>> >>> >>> If I recall right, it is not written in the ioam data draft. >>> >>> Yes, node by node configuration is an easy way. In the >>> draft-zhou-ippm-ioam-yang, we have the =E2=80=9Cprotocol-type=E2=80=9D = to indicate >>> the layering. >>> >>> +--rw ioam >>> >>> +--rw ioam-profiles >>> >>> +--rw enabled? boolean >>> >>> +--rw ioam-profile* [profile-name] >>> >>> +--rw profile-name string >>> >>> +--rw filter >>> >>> | +--rw filter-type? ioam-filter-type >>> >>> | +--rw acl-name? -> /acl:acls/acl/name >>> >>> +--rw protocol-type? ioam-protocol-type >>> >>> +--rw incremental-tracing-profile {incremental-trace}? >>> >>> | ... >>> >>> +--rw preallocated-tracing-profile {preallocated-trace}? >>> >>> | ... >>> >>> +--rw pot-profile {proof-of-transit}? >>> >>> | ... >>> >>> +--rw e2e-profile {edge-to-edge}? >>> >>> ... >>> >>> >>> >>> >>> >>> Tianran >>> >>> From: Frank Brockners (fbrockne) [mailto:fbrockne@cisco.com] >>> Sent: Monday, April 16, 2018 4:51 PM >>> To: Tianran Zhou ; Mickey Spiegel >>> ; Tom Herbert >>> Cc: NVO3 ; int-area@ietf.org; Service Function >>> Chaining IETF list ; IETF IPPM WG >>> Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various >>> protocols - follow up from WG discussion in London >>> >>> >>> >>> Hi Tianran, >>> >>> >>> >>> IOAM is a domain specific feature (see also >>> draft-ietf-ippm-ioam-data-02 sections 3 and 4), which allows an >>> operator to control by means of configuration where and for which >>> traffic IOAM data fields are added/updated/removed from the customer >>> traffic. Using your example of Geneve over IPv6 =E2=80=93 with IOAM dat= a in >>> both the Geneve and the IPv6 protocol, one would expect that the >>> operator configures the endpoints of the Geneve tunnel to operate on >>> the IOAM data in Geneve, and the IPv6 routers that the Geneve tunnel >>> >>> traverses to operate on the IOAM data in IPv6. >>> >>> >>> >>> >>> Frank >>> >>> >>> >>> From: Tianran Zhou >>> Sent: Montag, 16. April 2018 10:37 >>> To: Frank Brockners (fbrockne) ; Mickey Spiegel >>> ; Tom Herbert >>> Cc: NVO3 ; int-area@ietf.org; Service Function >>> Chaining IETF list ; IETF IPPM WG >>> Subject: RE: [ippm] [Int-area] encapsulation of IOAM data in various >>> protocols - follow up from WG discussion in London >>> >>> >>> >>> Hi Frank, >>> >>> >>> >>> How does a forwarder know when and where to insert the data? >>> >>> In the case of Geneve over IPv6, do you mean the device need to scan >>> all the protocol stack? Or just the outer encapsulation? >>> >>> >>> >>> Tianran >>> >>> >>> >>> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Frank >>> Brockners >>> (fbrockne) >>> Sent: Monday, April 16, 2018 3:08 PM >>> To: Mickey Spiegel ; Tom Herbert >>> >>> Cc: NVO3 ; int-area@ietf.org; Service Function >>> Chaining IETF list ; IETF IPPM WG >>> Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various >>> protocols - follow up from WG discussion in London >>> >>> >>> >>> >>> >>> Tom, >>> >>> >>> >>> a quick addition to what Mickey mentioned below: What you seem to >>> have in mind is what draft-ietf-ippm-ioam-data-02 refers to as =E2=80= =9Clayering=E2=80=9D >>> (see section 3.), i.e. if you=E2=80=99re running for example Geneve ove= r >>> IPv6, then IOAM data could be encapsulated in both protocols, Geneve >>> and >>> IPv6 =E2=80=93 giving you visibility into the =E2=80=9Cunderlay=E2=80= =9D (IPv6) and the =E2=80=9Coverlay=E2=80=9D >>> >>> (Geneve). >>> >>> >>> >>> >>> Frank >>> >>> >>> >>> From: ippm On Behalf Of Mickey Spiegel >>> Sent: Freitag, 13. April 2018 20:22 >>> To: Tom Herbert >>> Cc: NVO3 ; int-area@ietf.org; Service Function >>> Chaining IETF list ; IETF IPPM WG >>> Subject: Re: [ippm] [Int-area] encapsulation of IOAM data in various >>> protocols - follow up from WG discussion in London >>> >>> >>> >>> Tom, >>> >>> >>> >>> On Thu, Apr 12, 2018 at 10:17 PM, Tom Herbert wro= te: >>> >>> Mickey, >>> >>> Looking at these ippm drafts more closely, I have a much more >>> fundamental concern. >>> >>> In draft-brockners-ippm-ioam-geneve-00 for instance, there is the >>> text in the introduction: >>> >>> "In-situ OAM (IOAM) records OAM information within the packet while >>> the packet traverses a particular network domain. The term "in-situ" >>> refers to the fact that the IOAM data fields are added to the data >>> packets rather than is being sent within packets specifically >>> dedicated to OAM. This document defines how IOAM data fields are >>> transported as part of the Geneve [I-D.ietf-nvo3-geneve] >>> encapsulation." >>> >>> I assume this means that as packets with Geneve encapsulation >>> traverse the network they are interpreted by intermediate nodes as >>> being Geneve. Since Geneve is a UDP encapsulation, then the >>> destination UDP port number would be used to identify packets as >>> being Geneve. So an intermediate device might be looking for UDP >>> packets destined to port >>> 6081 (the assigned UDP port for Geneve). If my understanding is >>> correct, then this is a problem. >>> >>> UDP port numbers do not have global meaning. An intermediate device >>> may very well see UDP packets destined to port 6081 that are not >>> actually Geneve. This scenario is discussed in RFC7605: >>> >>> "...intermediate device interprets traffic based on the port number. >>> It is important to recognize that any interpretation of port numbers >>> -- except at the endpoints -- may be incorrect, because port numbers >>> are meaningful only at the endpoints." >>> >>> If the UDP data is modified, as the draft would imply, then >>> misinterpretation may also mean silent data corruption of packets. A >>> protocol that would allow this seems pretty incorrect! Note that >>> this would be true also for any UDP encapsulation that the network >>> tries to interpret. >>> >>> >>> >>> The intention is to allow for multiple nodes that a packet traverses >>> >>> to be able to insert IOAM node information in the same trace option, >>> >>> but leave some flexibility regarding which nodes actually do the >>> >>> IOAM processing and the node information. This may vary >>> >>> depending on the transport. >>> >>> >>> >>> In case of a tunneled encapsulation such as Geneve or VXLAN, >>> >>> there may still be multiple hops. For example a network may use >>> >>> Geneve or VXLAN, but only do L2 processing at ToRs, with L3 >>> >>> processing done at aggregation or core switches. In this case >>> >>> many packets would do 2 Geneve or VXLAN hops, so the packet >>> >>> would contain IOAM node information from two nodes. >>> >>> >>> >>> Another example is service function chaining using Geneve or >>> >>> VXLAN rather than NSH. >>> >>> >>> >>> >>> I am also wondering if hop-by-hop options been considered for this >>> application? Their interpretation in the network is unabiguous and >>> they also have the advantage that the work with any IP protocol or >>> encapsulation. >>> >>> >>> >>> IPv6 hop-by-hop options has been considered. See >>> >>> draft-brockners-inband-oam-transport-05. This has not yet been >>> >>> broken out into a separate draft. >>> >>> >>> >>> Mickey >>> >>> >>> >>> >>> Thanks, >>> Tom >>> >>> >>> On Thu, Apr 12, 2018 at 3:31 PM, Mickey Spiegel >>> wrote: >>> >>> Tom, >>> >>> On Thu, Apr 12, 2018 at 2:46 PM, Tom Herbert wrot= e: >>> >>> >>> On Thu, Apr 12, 2018 at 9:54 AM, Greg Mirsky >>> >>> wrote: >>> >>> Hi Frank, >>> thank you for sharing your points. Please find my notes in-line >>> and tagged >>> GIM>>. I believe that this is very much relevant to work of >>> GIM>>other >>> working >>> groups that directly work on the overlay encapsulations in the >>> center of the discussion and hence I've added them to the list. >>> Hope we'll have more opinions to reach the conclusion that is >>> acceptable to all. >>> >>> Regards, >>> Greg >>> >>> On Wed, Apr 11, 2018 at 12:02 PM, Frank Brockners (fbrockne) >>> wrote: >>> >>> >>> Back at the IPPM meeting in London, we discussed several drafts >>> dealing with the encapsulation of IOAM data in various >>> protocols (draft-brockners-ippm-ioam-vxlan-gpe-00, >>> draft-brockners-ippm-ioam-geneve-00, >>> draft-weis-ippm-ioam-gre-00). One discussion topic that we >>> decided to take to the list was the question on whether >>> draft-ooamdt-rtgwg-ooam-header could be leveraged.. After >>> carefully considering draft-ooamdt-rtgwg-ooam-header, I came to >>> the conclusion that the =E2=80=9COOAM header=E2=80=9D does not meet the= needs >>> of >>> IOAM: >>> >>> * Efficiency: IOAM adds data to live user traffic. As such, an >>> encapsulation needs to be as efficient as possible. The =E2=80=9COOAM h= eader=E2=80=9D >>> is 8 >>> bytes long. The approach for IOAM data encapsulation in the >>> above mentioned drafts only requires 4 bytes. Using the OOAM >>> header approach would add an unnecessary overhead of 4 bytes =E2=80=93 >>> which is significant. >>> >>> Greg, >>> >>> I'm missing something here. I looked at the drafts you referenced >>> and each of them looks like the overhead for OAM is greater that >>> four bytes. In each there is some overhead equivalent to >>> type/length, for instance in Geneve four bytes are needed for >>> option class, type, and length. Unless the the OAM data is zero >>> length, I don't see how this adds up to only four bytes of overhead. >>> >>> >>> >>> The four versus eight bytes just refers to the fields in the four >>> bytes of IOAM info, that is common to all IOAM options. Beyond >>> that, there are IOAM option specific fields. For example if doing >>> one of the IOAM trace options, there are four bytes of trace option >>> header, including the IOAM-trace-type, NodeLen, Flags, and >>> RemainingLen fields. These are followed by the node data list >>> containing the per hop IOAM information. >>> >>> In looking at the OOAM header content, it has nothing to do with >>> any of the IOAM information after the first four bytes. It contains >>> another variant of the information in the first four bytes of IOAM >>> info, spread out over eight bytes. >>> >>> >>> Tom >>> >>> >>> GIM>> The difference in four octets is because OOAM Header: >>> >>> provides more flexibility, e.g. Flags field and Reserved fields; >>> >>> >>> >>> The flags field only has one defined flag at the moment, for a >>> timestamp block. For IOAM trace we need per hop timestamps, which >>> the timestamp block cannot address, i.e. the timestamp block is >>> redundant for >>> >>> IOAM. >>> >>> >>> >>> supports larger OAM packets than iOAM header; >>> >>> >>> >>> For IOAM purposes, 1020 octets is more than enough. >>> >>> >>> is future proof by supporting versioning (Version field). >>> >>> >>> >>> IMO, taking the first two bits of the IOAM-Type to define a Version >>> field would be a good thing. This does not require adding four more >>> bytes of overhead. 64 IOAM-Types is more than enough. >>> >>> >>> >>> * Maturity: IOAM has several implementations, which were also >>> shown at recent IETF hackathons =E2=80=93 and we=E2=80=99re expecting >>> additional implementations to be publicized soon. Interoperable >>> implementations need timely specifications. Despite the >>> question being asked, the recent thread on OOAM in the NVO3 >>> list hasn=E2=80=99t revealed any implementation of the OOAM header. >>> In >>> addition, the thread revealed that several fundamental >>> questions about the OOAM header are still open, such as whether >>> or how active OAM mechanisms within protocols such as Geneve >>> would apply to the OOAM header. This ultimately means that we >>> won=E2=80=99t get to a timely specification. >>> >>> >>> GIM>> May I ask which encapsulations supported by the >>> GIM>> implementations >>> you >>> refer to. Until very recently all iOAM proposals were to use >>> meta-data TLV in, e.g. Geneve and NSH. And if these or some of >>> these implementations already updated to the newly proposed iOAM >>> shim, I don't see problem in making them use OOAM Header. Would >>> you agree? >>> >>> >>> * Scope: It isn=E2=80=99t entirely clear to which protocols the OOAM >>> header would ultimately apply to. The way the OOAM header is >>> defined, OOAM uses a 8-bit field for =E2=80=9CNext Prot=E2=80=9D, the n= ext >>> protocol. Some protocols that IOAM data needs to be >>> encapsulated into use 16-bits for their next protocol code points. See = e.g. >>> the GRE encapsulation =E2=80=93 as specified in >>> draft-weis-ippm-ioam-gre-00. >>> >>> >>> GIM>> The first paragraph of the Introduction section states: >>> New protocols that support overlay networks like VxLAN-GPE >>> [I-D.ietf-nvo3-vxlan-gpe], GUE [I-D.ietf-nvo3-gue], Geneve >>> [I-D.ietf-nvo3-geneve], BIER >>> [I-D.ietf-bier-mpls-encapsulation], >>> >>> and >>> >>> NSH [I-D.ietf-sfc-nsh] support multi-protocol payload, e.g. >>> Ethernet, IPv4/IPv6, and recognize Operations, Administration, and >>> Maintenance (OAM) as one of distinct types. That ensures that >>> Overlay OAM (OOAM)packets are sharing fate with Overlay data packet >>> traversing the underlay. >>> I'm updating the OOAM Header draft and along with cleaning nits >>> will update reference to GUE. I think that the list and the >>> statemnt are quite clear in identifying the scope of networks >>> that may benefit from using not only common OOAM Header but >>> common OOAM mechanisms, e.g. Echo Request/Reply. >>> >>> With the above in mind, I=E2=80=99d suggest that the WG moves forward >>> with specific definitions for encapsulating IOAM data into >>> protocols =E2=80=93 per the above mentioned drafts. >>> >>> >>> >>> Regards, Frank >>> >>> >>> _______________________________________________ >>> ippm mailing list >>> ippm@ietf.org >>> https://www.ietf.org/mailman/listinfo/ippm >>> >>> >>> >>> _______________________________________________ >>> Int-area mailing list >>> Int-area@ietf.org >>> https://www.ietf.org/mailman/listinfo/int-area >>> >>> >>> _______________________________________________ >>> ippm mailing list >>> ippm@ietf.org >>> https://www.ietf.org/mailman/listinfo/ippm >>> >>> >>> >>> >>> >>> >>> _______________________________________________ >>> sfc mailing list >>> 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([64.101.220.160]) with mapi id 15.00.1320.000; Sun, 22 Apr 2018 20:00:26 -0400 From: "Carlos Pignataro (cpignata)" To: Tom Herbert CC: "Frank Brockners (fbrockne)" , NVO3 , Service Function Chaining IETF list , IETF IPPM WG , Mickey Spiegel , "Shwetha Bhandari (shwethab)" , Tianran Zhou Thread-Topic: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London Thread-Index: AQHT1en5jaGR0tKoZUqNJvcZ9CCngaQE2SWAgABtMICABQVeAIABT8mAgADvQ2mAALpSAIAAaaeA Date: Mon, 23 Apr 2018 00:00:25 +0000 Message-ID: <21C483C8-3AEF-462D-979C-B2A40C99E905@cisco.com> References: <8d1b3bb4a1794c4fac3455257e0ab60e@XCH-RCD-008.cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted Content-Type: text/plain; charset="utf-8" Content-ID: <35FF68179B296541B13289652DFE120C@emea.cisco.com> Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [sfc] [ippm] [Int-area] encapsulation of IOAM data in various protocols - follow up from WG discussion in London X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Apr 2018 00:00:51 -0000 SGkgVG9tLA0KDQpBIHF1aWNrIHRvcC1wb3N0IHJlc3BvbnNlOiBJIGJlbGlldmUgeW91IGFyZSBt YWtpbmcgYXNzdW1wdGlvbnMgYWJvdXQgaG93IHRoaXMgd29ya3MgaW4gYSBtdWx0aXBsYXllciBl bnZpcm9ubWVudCwgYW5kIGFib3V0IHdoaWNoIG5vZGVzIGNhbiBtb2RpZnkgd2hhdC4gDQoNCklu c3RlYWQgb2YgZW1haWwsIGxldCB1cyAobGlrZSBGcmFuayBoYWQgYWxzbyBzYWlkKSBleHBhbmQg b24gYSB0aWdodGVyIGRlc2NyaXB0aW9uIGFuZCB1c2UgY2FzZSBleGFtcGxlIGluIHRoZSBkcmFm dCBpdHNlbGYsIFNlY3Rpb24gMywgYW5kIGNsb3NlIHRoaXMgbG9vcCB0aGF0IHdheS4gDQoNClRo dW1iIHR5cGVkIGJ5IENhcmxvcyBQaWduYXRhcm8uDQpFeGN1emUgdHlwb2ZyYXBoaWNhayBlcnJv d3MNCg0KPiBPbiBBcHIgMjIsIDIwMTgsIGF0IDExOjI4LCBUb20gSGVyYmVydCA8dG9tQGhlcmJl 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--_000_BLUPR05MB3700E79B55EB5F6BFF2D88DBB890BLUPR05MB370namprd_-- From nobody Thu Apr 26 08:16:42 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9524B12DA3E for ; Thu, 26 Apr 2018 08:16:39 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.7 X-Spam-Level: X-Spam-Status: No, score=-2.7 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com 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 htO1dbhtp_Yj for ; Thu, 26 Apr 2018 08:16:36 -0700 (PDT) Received: from mailb2.tigertech.net (mailb2.tigertech.net [208.80.4.154]) (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 ECACD12E868 for ; Thu, 26 Apr 2018 08:16:35 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mailb2.tigertech.net (Postfix) with ESMTP id D5E4242954B; Thu, 26 Apr 2018 08:16:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=2.tigertech; t=1524755795; bh=nSKqkONU/UHU/aJ7dogjDizWHt8uuZ9XxJgyxusrCuU=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=L0OmsbZ2jEAYEs9vZL0lWzRJOqg/B7o6zePYb6nM0gYXxedcAPfkcHIQG8c/MPigv TX9f2zqOpk6B8HyJrzfAZ6d1F9hXHi2+pVRI0LP+S1p7PwBnLPT3rsP7wGdDmy1ct7 CCM9q7OULMKwQho+qHN7042NBIhK6n0qQNMJAuic= X-Virus-Scanned: Debian amavisd-new at b2.tigertech.net Received: from Joels-MacBook-Pro.local (unknown [213.249.13.230]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mailb2.tigertech.net (Postfix) with ESMTPSA id CB40242954A; Thu, 26 Apr 2018 08:16:32 -0700 (PDT) To: RFC Errata System , paulq@cisco.com, tnadeau@lucidvision.com, db3546@att.com, aretana.ietf@gmail.com, martin.vigoureux@nokia.com, james.n.guichard@huawei.com Cc: yanliuzhangyan@163.com, sfc@ietf.org References: <20180426150644.F13D0B80837@rfc-editor.org> From: "Joel M. Halpern" Message-ID: <8e7872f6-51a1-3086-36b4-676114192880@joelhalpern.com> Date: Thu, 26 Apr 2018 11:16:30 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <20180426150644.F13D0B80837@rfc-editor.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [sfc] [Technical Errata Reported] RFC7498 (5336) X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Apr 2018 15:16:39 -0000 This errata seems to be simply wrong. It may be based on a misreading by the submitted that assumed the SFC Path identification is part of the metadata. Even in the problem statement, that was not the intent. Net recommendation: Reject. Yours, Joel On 4/26/18 11:06 AM, RFC Errata System wrote: > The following errata report has been submitted for RFC7498, > "Problem Statement for Service Function Chaining". > > -------------------------------------- > You may review the report below and at: > http://www.rfc-editor.org/errata/eid5336 > > -------------------------------------- > Type: Technical > Reported by: Boyuan Yan > > Section: 3.3 > > Original Text > ------------- > The SFC encapsulation also carries data-plane metadata that provides > the ability to exchange information between logical classification > points and service functions (and vice versa) and between service > functions. Metadata is not used as forwarding information to deliver > packets along the service overlay. > > > Corrected Text > -------------- > The SFC encapsulation also carries data-plane metadata that provides > the ability to exchange information between logical classification > points and service functions (and vice versa) and between service > functions. Metadata is used as forwarding information to deliver > packets along the service overlay. > > > Notes > ----- > Error occurs in the last sentence of 2nd paragraph in Section 3.3. Metadata should be used as forwarding information to deliver packets along the service overlay. > > Instructions: > ------------- > This erratum is currently posted as "Reported". If necessary, please > use "Reply All" to discuss whether it should be verified or > rejected. When a decision is reached, the verifying party > can log in to change the status and edit the report, if necessary. > > -------------------------------------- > RFC7498 (draft-ietf-sfc-problem-statement-13) > -------------------------------------- > Title : Problem Statement for Service Function Chaining > Publication Date : April 2015 > Author(s) : P. Quinn, Ed., T. Nadeau, Ed. > Category : INFORMATIONAL > Source : Service Function Chaining > Area : Routing > Stream : IETF > Verifying Party : IESG > From nobody Thu Apr 26 08:17:27 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BECF212DA17 for ; Thu, 26 Apr 2018 08:07:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.2 X-Spam-Level: X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, URIBL_BLOCKED=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 P0fGxg-qf-vS for ; Thu, 26 Apr 2018 08:07:05 -0700 (PDT) Received: from rfc-editor.org (rfc-editor.org [4.31.198.49]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2D0BD1275F4 for ; Thu, 26 Apr 2018 08:07:05 -0700 (PDT) Received: by rfc-editor.org (Postfix, from userid 30) id F13D0B80837; Thu, 26 Apr 2018 08:06:44 -0700 (PDT) To: paulq@cisco.com, tnadeau@lucidvision.com, db3546@att.com, aretana.ietf@gmail.com, martin.vigoureux@nokia.com, james.n.guichard@huawei.com, jmh@joelhalpern.com X-PHP-Originating-Script: 30:errata_mail_lib.php From: RFC Errata System Cc: yanliuzhangyan@163.com, sfc@ietf.org, rfc-editor@rfc-editor.org Content-Type: text/plain; charset=UTF-8 Message-Id: <20180426150644.F13D0B80837@rfc-editor.org> Date: Thu, 26 Apr 2018 08:06:44 -0700 (PDT) Archived-At: X-Mailman-Approved-At: Thu, 26 Apr 2018 08:17:26 -0700 Subject: [sfc] [Technical Errata Reported] RFC7498 (5336) X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Apr 2018 15:07:07 -0000 The following errata report has been submitted for RFC7498, "Problem Statement for Service Function Chaining". -------------------------------------- You may review the report below and at: http://www.rfc-editor.org/errata/eid5336 -------------------------------------- Type: Technical Reported by: Boyuan Yan Section: 3.3 Original Text ------------- The SFC encapsulation also carries data-plane metadata that provides the ability to exchange information between logical classification points and service functions (and vice versa) and between service functions. Metadata is not used as forwarding information to deliver packets along the service overlay. Corrected Text -------------- The SFC encapsulation also carries data-plane metadata that provides the ability to exchange information between logical classification points and service functions (and vice versa) and between service functions. Metadata is used as forwarding information to deliver packets along the service overlay. Notes ----- Error occurs in the last sentence of 2nd paragraph in Section 3.3. Metadata should be used as forwarding information to deliver packets along the service overlay. Instructions: ------------- This erratum is currently posted as "Reported". If necessary, please use "Reply All" to discuss whether it should be verified or rejected. When a decision is reached, the verifying party can log in to change the status and edit the report, if necessary. -------------------------------------- RFC7498 (draft-ietf-sfc-problem-statement-13) -------------------------------------- Title : Problem Statement for Service Function Chaining Publication Date : April 2015 Author(s) : P. Quinn, Ed., T. Nadeau, Ed. Category : INFORMATIONAL Source : Service Function Chaining Area : Routing Stream : IETF Verifying Party : IESG From nobody Sun Apr 29 07:35:02 2018 Return-Path: X-Original-To: sfc@ietf.org Delivered-To: sfc@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 1DC9F1201FA; Sun, 29 Apr 2018 07:34:56 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: sfc@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.79.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <152501249602.32632.6254222075854145176@ietfa.amsl.com> Date: Sun, 29 Apr 2018 07:34:56 -0700 Archived-At: Subject: [sfc] I-D Action: draft-ietf-sfc-hierarchical-08.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 29 Apr 2018 14:34:56 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Service Function Chaining WG of the IETF. Title : Hierarchical Service Function Chaining (hSFC) Authors : David Dolson Shunsuke Homma Diego R. Lopez Mohamed Boucadair Filename : draft-ietf-sfc-hierarchical-08.txt Pages : 26 Date : 2018-04-29 Abstract: Hierarchical Service Function Chaining (hSFC) is a network architecture allowing an organization to decompose a large-scale network into multiple domains of administration. The goals of hSFC are to make a large-scale network easier to reason about, simpler to control and to support independent functional groups within large network operators. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-sfc-hierarchical/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-sfc-hierarchical-08 https://datatracker.ietf.org/doc/html/draft-ietf-sfc-hierarchical-08 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-hierarchical-08 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Sun Apr 29 07:37:46 2018 Return-Path: X-Original-To: sfc@ietfa.amsl.com Delivered-To: sfc@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3A2B11201FA; Sun, 29 Apr 2018 07:37:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.649 X-Spam-Level: X-Spam-Status: No, score=-1.649 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001] autolearn=no 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 jip4Z8nxkYoA; Sun, 29 Apr 2018 07:37:41 -0700 (PDT) Received: from smtp1.execulink.net (smtp1.execulink.net [69.63.44.82]) (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 6C25B120713; Sun, 29 Apr 2018 07:37:41 -0700 (PDT) Received: from node-3067.tor.pppoe.execulink.com ([216.59.251.251] helo=[192.168.123.13]) by smtp1.execulink.net with esmtpsa (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.89) (envelope-from ) id 1fCnSN-0006vh-Ue; Sun, 29 Apr 2018 10:37:40 -0400 To: Martin Vigoureux , draft-ietf-sfc-hierarchical@ietf.org Cc: sarikaya@ieee.org, "sfc-chairs@ietf.org" , sfc@ietf.org References: <49f64a48-cd4c-db01-7741-66f6c613c77d@nokia.com> <31459972-303b-004d-2b8d-2138916876d3@golden.net> From: Dave Dolson Message-ID: <9a4565a8-a2d3-6ec9-1a49-ae5420ec4568@golden.net> Date: Sun, 29 Apr 2018 10:37:37 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <31459972-303b-004d-2b8d-2138916876d3@golden.net> Content-Type: multipart/alternative; boundary="------------25D176468192954FCD7FEB86" Content-Language: en-US Archived-At: Subject: Re: [sfc] AD review for draft-ietf-sfc-hierarchical-07 X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 29 Apr 2018 14:37:44 -0000 This is a multi-part message in MIME format. --------------25D176468192954FCD7FEB86 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit I have uploaded a new version of the draft reflecting my suggestions below. On 2018-04-21 11:23 PM, Dave Dolson wrote: > > Martin, > > Thank you for the careful review. > > My comments below are as an individual contributor. > > As an editor, I welcome feedback from the working group. > > -Dave > > > On 2018-04-10 6:11 AM, Martin Vigoureux wrote: >> Hello, >> >> I have reviewed this document, thanks to all of you for putting it >> together. Please see my comments below. >> >> Thank you >> -m >> >> >> General: >> I am in two minds about this document and maybe because the document >> itself seems to not have clear intent. >> >> It is not clear whether this is simply describing what could be done >> or prescribing what should be done. I take the fact that this is an >> Informational document as leaning towards "description" but there are >> pieces of text which clearly look like prescriptive >> protocol/functional behaviour (although some are not detailed enough >> to allow for an implementation). >> >> I would really appreciate if the objective of this document could be >> clarified so that the reader knows what to expect. > As an original author, my intention was to show a network architecture > that allows SFC to scale. Hence it would be informational and > optional. We could make that explicit in the introduction and abstract. > >> >> Also, I am not advocating for making this a Standard Track document >> as I believe it would require a lot of rework but on the other hand I >> am not sure how much help it provides to the persons that would want >> to use the concept of hierarchy when deploying SFC in a large domain, >> nor to those that would need to implement it before that. You'll find >> specific comments below but that bigger question remains. >> >> Also, the Shepherd write-up does not seem to follow the template. >> Any reason for that? I'd prefer if it was re-written according to the >> template. Thanks. >> >> >> Specific: >> Header: >> please write the submission date in the correct format > Agreed. > >> >> 1. Introduction >>    Service Function Chaining (SFC) is a technique for prescribing >>    differentiated traffic forwarding policies within an SFC-enabled >>    domain. >> I am concerned by the fact that this document seems to give another >> definition to SFC. I'm not saying this is wrong but I'd be much more >> comfortable if it was simply saying: >> >>    The SFC architecture is described in detail in [RFC7665], and is not >>    repeated here. This document simply uses that architecture. >> >> >>    We assume that some Service Function Paths (SFPs) need to be selected >>    on the basis of application-specific data visible to the network >> What are the security implications of this assumption? Can we remove >> that? I think SFC has had it's share of security related discussions. > I think that can be changed to > We assume that > some Service Function Paths (SFPs) need to be selected on the basis > of transport-layer coordinates. > >> >>    So instead of considering a single SFC Control Plane ([I-D.ietf- >>    sfc-control-plane]) >> I'd prefer not to reference a document which has been abandoned by >> the WG > I propose leaving the discussion of control plane, and just removing > the document references. > >> >>    Decomposing a network into multiple SFC-enabled domains should permit >>    end-to-end visibility of SFs and SFPs. >> Is that a wishful outcome or a requirement? > I'm not sure myself what that means. I think it can be removed. >> >>    The criteria for decomposing a domain into multiple SFC-enabled >>    sub-domains are beyond the scope of this document.  These criteria >>    are deployment-specific. >> While I understand this statement, it kind of defeats a good part of >> the purpose of the document, doesn't it? > I think the idea is that there are lots of ways one could divide > functions into different sub-domains. We don't want to tell the > operator why they would want to do different things, just explain the > tools available. Like explaining a programming language without trying > to explain all of the programs one could write... > >> >> >> 2.  Hierarchical Service Function Chaining (hSFC) >> >>    A hierarchy has multiple levels: the top-most level encompasses the >>    entire network domain to be managed, and lower levels encompass >>    portions of the network.  These levels are discussed in the following >>    sub-sections. >> Should it always be like that or is that just a way and there could >> be other ways? Can we have more-than-two-levels hierarchies or should >> they all be top-and-lower? > Should it always be like that? Hierarchical is optional, if that's > what you mean. > I think "multiple levels" means more than two are possible. > In a hierarchy the higher levels are more encompassing... I don't > think I understand your concern. > >> >> 2.1.  Top Level >> This section describes at length the figure/example but what are the >> take-aways? >> >>    Considering the example depicted in Figure 1, a top-level network >>    domain includes SFC data plane components distributed over a wide >>    area, including: >> >>    o  Classifiers (CFs), >>    o  Service Function Forwarders (SFFs) and >>    o  Sub-domains. >> Is that an illustrative way to partition the components (e.g., CFs >> and SFFs part of the top-level) or is that the recommended way? > There would need to be CFs and SFFs at each level. Maybe I miss your > point. > >> >>    We expect the system to include a top-level control plane having >>    responsibility for configuring forwarding policies and traffic >>    classification rules (see for example, [I-D.ietf-sfc-control-plane]). >> again, I'd prefer not to reference this doc. More generally, is that >> needed? I don't think so. > We can remove the reference. > >> >> 2.2.  Lower Levels >> Same general comment than 2.1. Also, in this section you largely >> discuss the IBN, which is in fact only introduced after. > The IBN is introduced here, and explained in greater detail in a later > section. > >> >> 3.  Internal Boundary Node (IBN) >> This is the core of the proposal, in my opinion, but it comes very >> late in the document. If you don't want to rearchitect the whole >> document you should at least have some text (a sentence at bare >> minimum) early in the document that says something like : >>    we introduce the concept of an IBN which acts as the gateway between >>    the levels of the hierarchy. We also discuss the options for >>    realizing this function. > Thanks. I think we can add this to the introduction. >> >> 3.1.x >> Is there a recommended way of doing IBN Path Configuration out of the >> 5 listed? > We did not take any such conclusion. > >> >> >> 4.  Sub-domain Classifier >>    Another goal of the hierarchical approach is to simplify the >>    mechanisms of scaling in and scaling out SFs.  All of the >>    complexities of load-balancing among multiple SFs can be handled >>    within a sub-domain, under control of the classifier, allowing the >>    higher-level domain to be oblivious to the existence of multiple SF >>    instances. >> I don't see the simplification here. You hide the complexity to the >> higher level, but it remains in the lower one, doesn't it? > If there are multiple sub-domains, they can each be managed > independently, each dealing with a subset of the complexity. If the > deployment were flat, a single controller would have to manage scaling > of multiple clusters. > So it is simpler in the scope handled by each controller. > >> >> >> 9.1 >> Please remove: >>    Generic security considerations related to the control plane are >>    discussed in [I-D.ietf-sfc-control-plane].  These considerations >>    apply for both high-level and low-level domains. >> > OK >> >> >> Nits: >> s/NSH [RFC8300]  or a similar/NSH [RFC8300] or a similar/ > If you are complaining about the extra space, this is a function of > the XML-->TXT rendering. > The XML is "NSH or a similar" > >> >>    One path is shown from edge classifier to SFF1 to Sub-domain#1 >>    (residing in data-center1) to SFF1 to SFF2 (residing in data-center >>    2) to Sub-domain#2 to SFF2 to network egress. >> Shouldn't this text be taken out of the figure and integrated in the >> body of the doc? > OK >> >> _______________________________________________ >> sfc mailing list >> sfc@ietf.org >> https://www.ietf.org/mailman/listinfo/sfc > --------------25D176468192954FCD7FEB86 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit

I have uploaded a new version of the draft reflecting my suggestions below.


On 2018-04-21 11:23 PM, Dave Dolson wrote:

Martin,

Thank you for the careful review.

My comments below are as an individual contributor.

As an editor, I welcome feedback from the working group.

-Dave


On 2018-04-10 6:11 AM, Martin Vigoureux wrote:
Hello,

I have reviewed this document, thanks to all of you for putting it together. Please see my comments below.

Thank you
-m


General:
I am in two minds about this document and maybe because the document itself seems to not have clear intent.

It is not clear whether this is simply describing what could be done or prescribing what should be done. I take the fact that this is an Informational document as leaning towards "description" but there are pieces of text which clearly look like prescriptive protocol/functional behaviour (although some are not detailed enough to allow for an implementation).

I would really appreciate if the objective of this document could be clarified so that the reader knows what to expect.
As an original author, my intention was to show a network architecture that allows SFC to scale. Hence it would be informational and optional. We could make that explicit in the introduction and abstract.


Also, I am not advocating for making this a Standard Track document as I believe it would require a lot of rework but on the other hand I am not sure how much help it provides to the persons that would want to use the concept of hierarchy when deploying SFC in a large domain, nor to those that would need to implement it before that. You'll find specific comments below but that bigger question remains.

Also, the Shepherd write-up does not seem to follow the template.
Any reason for that? I'd prefer if it was re-written according to the template. Thanks.


Specific:
Header:
please write the submission date in the correct format
Agreed.


1. Introduction
   Service Function Chaining (SFC) is a technique for prescribing
   differentiated traffic forwarding policies within an SFC-enabled
   domain.
I am concerned by the fact that this document seems to give another definition to SFC. I'm not saying this is wrong but I'd be much more comfortable if it was simply saying:

   The SFC architecture is described in detail in [RFC7665], and is not
   repeated here. This document simply uses that architecture.


   We assume that some Service Function Paths (SFPs) need to be selected
   on the basis of application-specific data visible to the network
What are the security implications of this assumption? Can we remove that? I think SFC has had it's share of security related discussions.
I think that can be changed to 
   We assume that
   some Service Function Paths (SFPs) need to be selected on the basis
   of transport-layer coordinates.

   So instead of considering a single SFC Control Plane ([I-D.ietf-
   sfc-control-plane])
I'd prefer not to reference a document which has been abandoned by the WG
I propose leaving the discussion of control plane, and just removing the document references.


   Decomposing a network into multiple SFC-enabled domains should permit
   end-to-end visibility of SFs and SFPs.
Is that a wishful outcome or a requirement?
I'm not sure myself what that means. I think it can be removed.

   The criteria for decomposing a domain into multiple SFC-enabled
   sub-domains are beyond the scope of this document.  These criteria
   are deployment-specific.
While I understand this statement, it kind of defeats a good part of the purpose of the document, doesn't it?
I think the idea is that there are lots of ways one could divide functions into different sub-domains. We don't want to tell the operator why they would want to do different things, just explain the tools available. Like explaining a programming language without trying to explain all of the programs one could write...



2.  Hierarchical Service Function Chaining (hSFC)

   A hierarchy has multiple levels: the top-most level encompasses the
   entire network domain to be managed, and lower levels encompass
   portions of the network.  These levels are discussed in the following
   sub-sections.
Should it always be like that or is that just a way and there could be other ways? Can we have more-than-two-levels hierarchies or should they all be top-and-lower?
Should it always be like that? Hierarchical is optional, if that's what you mean.
I think "multiple levels" means more than two are possible.
In a hierarchy the higher levels are more encompassing... I don't think I understand your concern.


2.1.  Top Level
This section describes at length the figure/example but what are the take-aways?

   Considering the example depicted in Figure 1, a top-level network
   domain includes SFC data plane components distributed over a wide
   area, including:

   o  Classifiers (CFs),
   o  Service Function Forwarders (SFFs) and
   o  Sub-domains.
Is that an illustrative way to partition the components (e.g., CFs and SFFs part of the top-level) or is that the recommended way?
There would need to be CFs and SFFs at each level. Maybe I miss your point.


   We expect the system to include a top-level control plane having
   responsibility for configuring forwarding policies and traffic
   classification rules (see for example, [I-D.ietf-sfc-control-plane]).
again, I'd prefer not to reference this doc. More generally, is that needed? I don't think so.
We can remove the reference.


2.2.  Lower Levels
Same general comment than 2.1. Also, in this section you largely discuss the IBN, which is in fact only introduced after.
The IBN is introduced here, and explained in greater detail in a later section.


3.  Internal Boundary Node (IBN)
This is the core of the proposal, in my opinion, but it comes very late in the document. If you don't want to rearchitect the whole document you should at least have some text (a sentence at bare minimum) early in the document that says something like :
   we introduce the concept of an IBN which acts as the gateway between
   the levels of the hierarchy. We also discuss the options for
   realizing this function.
Thanks. I think we can add this to the introduction.

3.1.x
Is there a recommended way of doing IBN Path Configuration out of the 5 listed?
We did not take any such conclusion.



4.  Sub-domain Classifier
   Another goal of the hierarchical approach is to simplify the
   mechanisms of scaling in and scaling out SFs.  All of the
   complexities of load-balancing among multiple SFs can be handled
   within a sub-domain, under control of the classifier, allowing the
   higher-level domain to be oblivious to the existence of multiple SF
   instances.
I don't see the simplification here. You hide the complexity to the higher level, but it remains in the lower one, doesn't it?
If there are multiple sub-domains, they can each be managed independently, each dealing with a subset of the complexity. If the deployment were flat, a single controller would have to manage scaling of multiple clusters.
So it is simpler in the scope handled by each controller.



9.1
Please remove:
   Generic security considerations related to the control plane are
   discussed in [I-D.ietf-sfc-control-plane].  These considerations
   apply for both high-level and low-level domains.

OK


Nits:
s/NSH [RFC8300]  or a similar/NSH [RFC8300] or a similar/
If you are complaining about the extra space, this is a function of the XML-->TXT rendering.
The XML is "<xref target="RFC8300">NSH</xref> or a similar"


   One path is shown from edge classifier to SFF1 to Sub-domain#1
   (residing in data-center1) to SFF1 to SFF2 (residing in data-center
   2) to Sub-domain#2 to SFF2 to network egress.
Shouldn't this text be taken out of the figure and integrated in the body of the doc?
OK

_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.ietf.org/mailman/listinfo/sfc


--------------25D176468192954FCD7FEB86--

On Wed, Apr 11, 2018 at 3:02 AM, Frank Bro= ckners (fbrockne) <fbrockne@cisco.com> wrote:

Back at the IPPM meeting in Lon= don, we discussed several drafts dealing with the encapsulation of IOAM dat= a in various protocols (draft-brockners-ippm-ioam-vxlan-gpe-00, draft-= brockners-ippm-ioam-geneve-00, draft-weis-ippm-ioam-gre-00). One discussion topic that we decided to take to the list was the question = on whether draft-ooamdt-rtgwg-ooam-header could be leveraged.=C2=A0 After c= arefully considering draft-ooamdt-rtgwg-ooam-header, I came to the con= clusion that the =E2=80=9COOAM header=E2=80=9D does not meet the needs of IOAM:

* Efficiency: IOAM adds data to= live user traffic. As such, an encapsulation needs to be as efficient as p= ossible. The =E2=80=9COOAM header=E2=80=9D is 8 bytes long. The approach fo= r IOAM data encapsulation in the above mentioned drafts only requires 4 bytes. Using the OOAM header approach would add an unneces= sary overhead of 4 bytes =E2=80=93 which is significant.

* Maturity: IOAM has several im= plementations, which were also shown at recent IETF hackathons =E2=80=93 an= d we=E2=80=99re expecting additional implementations to be publicized soon.= Interoperable implementations need timely specifications. Despite the question being asked, the recent thread on OOAM in the NVO3 li= st hasn=E2=80=99t revealed any implementation of the OOAM header. In additi= on, the thread revealed that several fundamental questions about the OOAM h= eader are still open, such as whether or how active OAM mechanisms within protocols such as Geneve would apply to t= he OOAM header. This ultimately means that we won=E2=80=99t get to a timely= specification.

* Scope: It isn=E2=80=99t entir= ely clear to which protocols the OOAM header would ultimately apply to. The= way the OOAM header is defined, OOAM uses a 8-bit field for =E2=80=9CNext = Prot=E2=80=9D, the next protocol. Some protocols that IOAM data needs to be encapsulated into use 16-bits for their next protocol code poi= nts. See e.g. the GRE encapsulation =E2=80=93 as specified in draft-weis-ip= pm-ioam-gre-00.

With the above in mind, I=E2=80= =99d suggest that the WG moves forward with specific definitions for encaps= ulating IOAM data into protocols =E2=80=93 per the above mentioned drafts.<= u>

=C2=A0

Regards, Frank


_______________________________________________
ippm mailing list
ippm@ietf.org
https://www.ietf.org/mailman/listinfo/ippm


To be completely clear, the two drafts I was referring to = in my email below are draft-xuclad-spring-sr-service-chaining-01 and d= raft-ietf-mpls-sfc-00.

Cheers,
Andy
=
On Sun, Apr 15, 2018 at 10:55 AM, Andrew G. Malis <agmalis= @gmail.com> wrote:
Zafar,= et al,

Perhaps the fairest to all concerned is for the = MPLS WG to adopt both drafts, and then it will be up to the WG (rather than= the authors) to best determine the technical details going forward, and ho= w best to document them. That way the work becomes the consensus product of= the WG.

Cheers,
Andy

=
On Sun, Apr 15, 2018 at 12:44 AM, Zafar Ali = (zali) <zali@cisco.com> wrote:

Dear Stewart, WG Chairs and the WG,

=C2=A0

I do not agree with Stewart=E2=80=99s points and wil= l response in a separate email. But all that is just noise and that cannot = resolve the issue at hand.

=C2=A0

A countless time, Xiaohu has raised the issue that t= he intellectual property for the contents in section 6 of draft-farrel-mpls= -sfc belongs to draft-xu-mpls-service-chaining. Please see one of Xiao= hu's recent emails with the subject "[spring] For the fairness and justice of the IETF culture" dated Thursday, April 5, 2018 at 12:34 AM, copied in the following.

=C2=A0

This issue was also rais= ed by many during the WG adoption poll of the document. The chairs adopted = the work with the promise of fixing the issue. Specifically, in the email t= o announce the adoption of the ID to the WG, the chair(s) mentioned the following:

=C2=A0

"That decision is t= aken, the issues that has been pointed out are

noted. These issues need to be resolved on the = mailing list and

rough consensus need to be reached for text cha= nges in the document.

Actually the members of the working group have = much more influence on

a working group document, than on an individual= draft.

It would be far better if we now focused on pro= posing text changes,

rather than discussing processes."<= u>

=C2=A0

This is a serious= issue; we need to remove section 6 from draft- farrel-mpls-sfc to m= ove forward. These contents will proceed in draft-xu*, where the contents s= tarted initially. Everyone will have a fair chance to contribute to the contents as part of collaborations on draft-xu= *.

=C2=A0

Thanks

=C2=A0

Regards =E2=80=A6 Zafar

=C2=A0