From nobody Sun Feb 3 02:11:57 2019 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 DB73612958B; Sun, 3 Feb 2019 02:11:55 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IETF Meeting Session Request Tool To: Cc: martin.vigoureux@nokia.com, tal.mizrahi.phd@gmail.com, sfc-chairs@ietf.org, sfc@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.90.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <154918871585.10973.15713908900632055353.idtracker@ietfa.amsl.com> Date: Sun, 03 Feb 2019 02:11:55 -0800 Archived-At: Subject: [sfc] sfc - Update to a Meeting Session Request for IETF 104 X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 03 Feb 2019 10:11:56 -0000 An update to a meeting session request has just been submitted by Tal Mizrahi, a Secretary of the sfc working group. --------------------------------------------------------- Working Group Name: Service Function Chaining Area Name: Routing Area Session Requester: Tal Mizrahi Number of Sessions: 1 Length of Session(s): 2 Hours Number of Attendees: 100 Conflicts to Avoid: First Priority: bess idr i2nsf ippm mpls spring rtgwg lisp ntp teas Second Priority: detnet People who must be present: Joel M. Halpern Jim Guichard Martin Vigoureux Tal Mizrahi Resources Requested: Special Requests: --------------------------------------------------------- From nobody Mon Feb 4 20:10:32 2019 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 1BBEB130FE1; Mon, 4 Feb 2019 20:10:30 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.749 X-Spam-Level: X-Spam-Status: No, score=-1.749 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, 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 BWIcsdncd3bY; Mon, 4 Feb 2019 20:10:28 -0800 (PST) Received: from mail-it1-x134.google.com (mail-it1-x134.google.com [IPv6:2607:f8b0:4864:20::134]) (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 4A68F129AB8; Mon, 4 Feb 2019 20:10:28 -0800 (PST) Received: by mail-it1-x134.google.com with SMTP id h193so5156420ita.5; Mon, 04 Feb 2019 20:10:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=iBkYl+iaMSCAxc1zyxwtsYK5lcUMws513NIa60Ba214=; b=rZ0dIJjp3lNpfHjxCfUw2CD2IiZ7VQ+R/BrONFwPjs6C/1D9IwtFoD3Nwbp/I3J3+s qRnx+8GS7/Ak2wDIIEQ+XLOkgeVPFM9765L+GZQAPRaRMHjjYpe0KGUy4FZeqsuCpFHL X40VZGKtsb+JczrzaTMDxdnPtqQfAsE5PdJfgxGFYxHQf50+KlgIOnYB4Fu5c/oqlXZG ipZ+Hzd6EReSCESYOcu5h9DQmjl9OUqMi/b5+7a4IOcL73n0BlQOq4U5AIYoj5txA1zk uOI2tJOVkTB8i0ual5DO3Nhab4HK6KNR0PzGjvS+O43+cYRPZfFcVSL1EytltmcZNLQI MXaw== 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=iBkYl+iaMSCAxc1zyxwtsYK5lcUMws513NIa60Ba214=; b=i4ZvI0HvIeG0ALS6KNKMh9o9q+RVprsH+143M+pgrwhrcgPZMSKgPmWyUPKN7IUPqU ujc+W+oGLoMwNN1fPaKZhfaSdpJsCpulj57kUZy8BepbFdRloNCSUfwmsjHKQu3cpjpf NUt1JT/qfcR95rOxXXjGzOybIqc1hQ0/0RtjKPku6goUTkUvbMJ6CC9107VDu5GNuEu1 3o8dcNaxmQMNVeIIih9NFJ75i2b4Wf8WNERzO5CEe9CSE/vidG59BMnGjctKN739o3v3 k4BdBWrBhEda/SpVYOBXL69kYQ1u57riRSDoVDxuzDbstvIRpdaIacy66iIZ7p9kaPU2 IKdA== X-Gm-Message-State: AHQUAubIz83frjrZlERI8KDD3uzMWMEKGQk99KedUT5Ub20ebwWDZmOG JkmU5nRYl6Z/ZlAYgPrq31xFnIK9umbC/RHGlUuZQw== X-Google-Smtp-Source: AHgI3IbdkIqiZ5CLrMIeAqbF2D8xSaRV6wkEjf4KQJVwNHv7tX8VuA0RcSX96JVF1B7nictUAfilp2Eu0WBXCc+UQKc= X-Received: by 2002:a02:7b09:: with SMTP id q9mr1642179jac.39.1549339827224; Mon, 04 Feb 2019 20:10:27 -0800 (PST) MIME-Version: 1.0 References: <154649225579.32607.12231566034033496144.idtracker@ietfa.amsl.com> In-Reply-To: From: Donald Eastlake Date: Mon, 4 Feb 2019 23:10:15 -0500 Message-ID: To: sfc@ietf.org Cc: sfc-chairs@ietf.org, draft-eastlake-sfc-nsh-ecn-support@ietf.org Content-Type: text/plain; charset="UTF-8" Archived-At: Subject: Re: [sfc] The SFC WG has placed draft-eastlake-sfc-nsh-ecn-support in state "Candidate for WG Adoption" X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Feb 2019 04:10:30 -0000 Hi, I support this draft as a co-author. We expect to post a revision to resolve comments shortly. There is IPR in this draft that has not yet been declared to the IETF and am working on getting a declaration filed. Thanks, Donald =============================== Donald E. Eastlake 3rd +1-508-333-2270 (cell) 1424 Pro Shop Court, Davenport, FL 33896 USA d3e3e3@gmail.com On Thu, Jan 3, 2019 at 9:15 AM Andrew G. Malis wrote: > > As a co-author, I feel that this draft is ready for WG adoption. > > Thanks, > Andy > > > On Thu, Jan 3, 2019 at 12:11 AM IETF Secretariat wrote: >> >> >> The SFC WG has placed draft-eastlake-sfc-nsh-ecn-support in state >> Candidate for WG Adoption (entered by Joel Halpern) >> >> The document is available at >> https://datatracker.ietf.org/doc/draft-eastlake-sfc-nsh-ecn-support/ >> >> Comment: >> This starts the WG call for adoption of this draft. >> Please respond to the list, indicating support for this as a work item of the >> working group with this document as the basis for the work, or objection to >> the working group adopting this item as a working group draft. >> >> The authors should confirm to the chairs and WG secretary that all IPR known >> to them relevant to this draft has been disclosed. >> >> The working group adoption call will last 2 weeks, ending at the end of the >> day on Thursday, January 17 2019 COB somewhere. >> >> Thank you, >> Joel From 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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, FREEMAIL_FROM=0.001, HTML_MESSAGE=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 rKlUJciPKbH4 for ; Tue, 5 Feb 2019 16:41:22 -0800 (PST) Received: from mail-lf1-x132.google.com (mail-lf1-x132.google.com [IPv6:2a00:1450:4864:20::132]) (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 C9385128B01 for ; Tue, 5 Feb 2019 16:41:21 -0800 (PST) Received: by mail-lf1-x132.google.com with SMTP id l10so4078925lfh.9 for ; Tue, 05 Feb 2019 16:41:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=3t7gffeQqy5vAvm6JZgF8XvQscSrFFdFgrzUSBqXZPA=; b=QcowHgY/eien4BYGz4pYsTeMeNzWvP3JZk6T0dI5gXWh2dnMqXeXlzyxHKWUcgQCFS 56DCrC7qJQAcPIalzkUKWjStwX2FqCulZyhuum9t+LUsOJFkfYNR3WsHb3gLSHcSweg7 D1dADmJvLzMeoa9KWfVZr2U1f6QzzObfsB3IvMOzGLVi4q6K6YHdlPJo7ijIYmUqlNkp iOWy3kiwfr6ZQTfPUoVvKy/obKuTEvlU6nk2je+OLp4aMqbsT9hW0GIm6E8yuK+iBlKO epx6O2FoVh/mhbYRY0K65NGQNs64uCJBkyu2wmLYiVmgWKa+F6FUpCUuosiw03cjIjgp FYKg== 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=3t7gffeQqy5vAvm6JZgF8XvQscSrFFdFgrzUSBqXZPA=; b=qdX4dovHv6HJbdt4PryP7BD2OVBv7YDq2D6qc7tWvK3fUuMxBOykg3qtsJWZW8SUbH ZMrSX5abybkhuqFjmws/ZABO6oWd/1thZEkZ3Jh9MjpES3D29+rQUbsai5XmxatjxIxB Wkr87HCaQvaX01BnxnR1FbtzaLO2yUA8k+Oc2Oa0Ew2zn/EtSUFW71hjuTAhADk7S0eU fuScJ1PO6DHMf1VA4FtYfp/L27fCpals2IJkvg6tuyrNjkrSh8tJkubJssb9WOfc7Rvr VaW+qNy3pnjLB4BMDSZiA8LHalxaXNiFDai/bXyT9u6uhrIyzzwua+v1S3jjO3dFuyoC vcGw== X-Gm-Message-State: AHQUAuaYmeGw7/NAIJ3zOsSQ5iRBlfhn5GU9uT0S3YsQ32dvpt+HkaEL zXlV9UKcUzLoLe8vZ+HlLi1Kqqi5I54iWG6uQFo= X-Google-Smtp-Source: AHgI3IYEboRUu4H/F9GjYb447V110aWw0pmKxR2IihP++Ouj/mjJjDmf98kI3nCOOrOZYoXjWKSZYbZUYt9yMo/733c= X-Received: by 2002:ac2:4291:: with SMTP id m17mr2595381lfh.20.1549413679822; Tue, 05 Feb 2019 16:41:19 -0800 (PST) MIME-Version: 1.0 References: <201901030041.x030fHSA068733@mse01.zte.com.cn> In-Reply-To: From: Greg Mirsky Date: Tue, 5 Feb 2019 16:41:08 -0800 Message-ID: To: Dirk.von-Hugo@telekom.de Cc: ao.ting@zte.com.cn, Service Function Chaining IETF list Content-Type: multipart/alternative; boundary="000000000000fefda505812efbda" Archived-At: Subject: Re: [sfc] Fw:New Version Notification for draft-ao-sfc-oam-path-consistency-04.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Feb 2019 00:41:25 -0000 --000000000000fefda505812efbda Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Dirk, thank you for your kind words about the drafts, thoughtful comments, and the most helpful suggestions. Will work on updating drafts and will share the proposed changes with you shortly. Best regards, Greg On Tue, Feb 5, 2019 at 8:06 AM wrote: > Dear all, > > I have read both drafts on extending SFC OAM by adding a reply path TLV > for testing SFPs and for checking consistency of SFPs. > > I believe that for operators such measures are very useful when SFC is > deployed in future networks and logical network slices. > > > > As both drafts rely on adopted WG draft > https://tools.ietf.org/html/draft-ietf-sfc-multi-layer-oam-01 I also had > a look at that one. > > Comments and nits: > > P.4: > > the service SFP1 may be realized through two RSPs, RSP1(SF1--SF3--SF5) an= d > RSP2(SF2--SF4--SF5). =3D> > > the service SFP1 may be realized through two independent RSPs, > RSP1(SF1--SF3--SF5) and RSP2(SF2--SF4--SF6). > > Since IMO there are further possible RSPs as SF1=E2=80=94SF4--SF5, SF1=E2= =80=94SF3=E2=80=94SF6, > etc. > > P.7: > > BFD =3D> BFD (Bidirectional Forwarding Detection) > > P.8: > > o Reply via Specified Path (TBA7) =3D> o Reply via Specified Path > (TBA8) > > P.9/p.10: > > *5.2* > *. > SFC Echo Request Reception* > > *5.4* > *. > Overlay Echo Reply Reception* > > There is still text missing in both sections > > > > Regarding the main drafts in focus here I only have very minor comments > (nits) on draft-ao-sfc-oam-returned-path-specified-02: > > P.2: > > [RFC7665], For example, =3D> [RFC7665]. For example, > > P.3: > > the SFC Reply Path TLV Section 4. =3D> the SFC Reply Path TLV as describe= d > in Section 4. > > P.5: > > return path is a SFP =3D> return path is an SFP > > SFP,it is assumed that the last SFF doesn't know the reply path of a SFC > > =3D> SFP, it is assumed that the last SFF doesn't know the reply path of = an > SFC > > > > And on draft-ao-sfc-oam-path-consistency-04.txt: > > P.2: > > Sometimes, a SF needs to =3D> Sometimes, an SF needs to > > P.4: > > following values Section 5.1 =3D> following values further detailed in > Section 5.1 > > as as described in Section=3D> as is described in Section > > P.6: > > list of the SFs are in load balance group > > =3D> list of the SFs which are in included in a load balance group. > > P.8/9: > > TBA1-TBA4, TBA6-TBA8 are requested but no TBA5?! > > > > As already said I think the extensions are useful and I see no open gaps. > > Thanks! > > Kind regards > > Dirk > > > > *From:* sfc *On Behalf Of *ao.ting@zte.com.cn > *Sent:* Mittwoch, 2. Januar 2019 15:42 > *To:* sfc@ietf.org > *Subject:* [sfc] Fw:New Version Notification for > draft-ao-sfc-oam-path-consistency-04.txt > > > > Hi all=EF=BC=8C > > > > We have updated a new version for draft draft-ao-sfc-oam-path-consistency= -04 > based on the discussion in the mailist. The main change is the COAM Reply > message for load balance scenario in section 3.4.2. Any comments are > always welcome. > > > > We think both draft-ao-sfc-oam-path-consistency-04( > https://tools.ietf.org/html/draft-ao-sfc-oam-path-consistency-04) and > draft-ao-sfc-oam-returned-path-specified-02( > https://tools.ietf.org/html/draft-ao-sfc-oam-return-path-specified-02) > are ready. We request for the consideration of the WG adoption. > > > > Best Regards. > > Ting Ao > > > > =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 > > *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*internet-drafts@ietf.org > > *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*Gregory Mirsky ;=E6=95=96=E5=A9=B700071246;Kent Leung < > kleung@cisco.com>;Zhonghua Chen <18918588897@189.cn>;Greg Mirsky < > gregimirsky@gmail.com>; > > *=E6=97=A5 **=E6=9C=9F **=EF=BC=9A*2018=E5=B9=B412=E6=9C=8827=E6=97=A5 16= :26 > > *=E4=B8=BB **=E9=A2=98 **=EF=BC=9ANew Version Notification for > draft-ao-sfc-oam-path-consistency-04.txt* > > > A new version of I-D, draft-ao-sfc-oam-path-consistency-04.txt > has been successfully submitted by Ting Ao and posted to the > IETF repository. > > Name: draft-ao-sfc-oam-path-consistency > Revision: 04 > Title: SFC OAM for path consistency > Document date: 2018-12-27 > Group: Individual Submission > Pages: 11 > URL: > https://www.ietf.org/internet-drafts/draft-ao-sfc-oam-path-consistency-04= .txt > Status: > https://datatracker.ietf.org/doc/draft-ao-sfc-oam-path-consistency/ > Htmlized: > https://tools.ietf.org/html/draft-ao-sfc-oam-path-consistency-04 > Htmlized: > https://datatracker.ietf.org/doc/html/draft-ao-sfc-oam-path-consistency > Diff: > https://www.ietf.org/rfcdiff?url2=3Ddraft-ao-sfc-oam-path-consistency-04 > > Abstract: > Service Function Chain (SFC) defines an ordered set of service > functions (SFs) to be applied to packets and/or frames and/or flows > selected as a result of classification. SFC Operation, > Administration and Maintenance can monitor the continuity of the SFC, > i.e., that all elements of the SFC are reachable to each other in the > downstream direction. But SFC OAM must support verification that the > order of traversing these SFs corresponds to the state defined by the > SFC control plane or orchestrator, the metric referred in this > document as the path consistency of the SFC. This document defines a > new SFC OAM method to support SFC consistency check, i.e. > verification that all elements of the given SFC are being traversed > in the expected order. > > > > > > > Please note that it may take a couple of minutes from the time of submiss= ion > until the htmlized version and diff are available at tools.ietf.org. > > The IETF Secretariat > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > --000000000000fefda505812efbda Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Dirk,
thank you for your kind words about the draft= s, thoughtful comments, and the most helpful suggestions. Will work on upda= ting drafts and will share the proposed changes with you shortly.=C2=A0

Best regards,
Greg

On Tue, Feb 5, 2019= at 8:06 AM <Dirk.von-Hugo@t= elekom.de> wrote:

Dear all,

I have read both drafts on ex= tending SFC OAM by adding a reply path TLV for testing SFPs and for checkin= g consistency of SFPs.

I believe that for operators = such measures are very useful when SFC is deployed in future networks and l= ogical network slices.

=C2=A0

As both drafts rely on adopte= d WG draft https://tools.ietf.org/html/= draft-ietf-sfc-multi-layer-oam-01 I also had a look at that one.

Comments and nits:<= /u>

P.4:

the service SFP1 may be realized through two RSP= s, RSP1(SF1--SF3--SF5) and RSP2(SF2--SF4--SF5). =3D>

the service SFP1 may be realized through two ind= ependent RSPs, RSP1(SF1--SF3--SF5) and RSP2(SF2--SF4--SF6).

Since IMO there are further p= ossible RSPs as SF1=E2=80=94SF4--SF5, SF1=E2=80=94SF3=E2=80=94SF6, etc.<= /u>

P.7:

BFD= =3D> BFD (Bidirectional Forwarding Detection)

P.8:

=C2=A0=C2=A0 o=C2=A0 Reply via Specified Path (T= BA7) =3D> =C2=A0=C2=A0=C2=A0o=C2=A0 Reply via Specified Path (TBA8)

P.9/p.10:

5.2.=C2=A0 SFC Echo Request Reception

5.4.=C2=A0 Overlay Echo Reply Reception

There is still text missing in both sections<= /u>

=C2=A0

Regarding the main drafts in = focus here I only have very minor comments (nits) on draft-ao-sfc-oam-returned-path-specified-02:

P.2:

[RF= C7665], For example, =3D> [RFC7665]. For example,

P.3:

<= span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:"Courier New= ";color:black;background:rgb(255,253,245)">the SFC Reply Path TLV Sect= ion 4. =3D> the SFC Reply Path TLV as described in Section 4.<= /u>

P.5:

ret= urn path is a SFP =3D> return path is an SFP

<= span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:"Courier New= ";color:black;background:rgb(255,253,245)">SFP,it is assumed that the = last SFF doesn't know the reply path of a SFC

<= span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:"Courier New= ";color:black;background:rgb(255,253,245)">=3D> SFP, it is assumed = that the last SFF doesn't know the reply path of an SFC

=C2=A0

And on draft-ao-sfc-oam-path-consistency-04.txt:

P.2:

Som= etimes, a SF needs to =3D> Sometimes, an SF needs to

P.4:

fol= lowing values Section 5.1 =3D> following values further detailed in Sect= ion 5.1

as = as described in Section=3D> as is described in Section

P.6:

<= span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:"Courier New= ";color:black;background:rgb(255,253,245)">list of the SFs are in load= balance group

<= span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:"Courier New= ";color:black;background:rgb(255,253,245)">=3D> list of the SFs whi= ch are in included in a load balance group.

P.8/9:

<= span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:"Courier New= ";color:black;background:rgb(255,253,245)">TBA1-TBA4, TBA6-TBA8 are re= quested but no TBA5?!

=C2=A0

As already said I think the e= xtensions are useful and I see no open gaps.

Thanks!<= /p>

Kind regards

Dirk

=C2=A0

From: sfc <sfc-bounces@ietf.org> On Behalf Of ao.ting@zte.com.cn
Sent: Mittwoch, 2. Januar 2019 15:42
To: sfc@ietf.org
Subject: [sfc] Fw:New Version Notification for draft-ao-sfc-oam-path= -consistency-04.txt

=C2=A0

Hi all=EF= =BC=8C=

=C2= =A0

We have up= dated a new version for draft=C2=A0draft-a= o-sfc-oam-path-consistency-04 based on the discussion in the mailist. The m= ain change is the COAM Reply message for load balance scenario in section 3.4.2.=C2=A0 Any comments are always welc= ome.

=C2= =A0

We think both draft-ao-sfc-oam-path-consistency-04(https://tools.ietf.org/html/draft-ao-sfc-oam-path-consistency-04) and draft-ao-sfc-oam-returned-path-specified-02(h= ttps://tools.ietf.org/html/draft-ao-sfc-oam-return-path-specified-02) a= re ready. We request for the consideration of the WG adoption.

=C2= =A0

Best Regar= ds.

Ting Ao=

=C2=A0<= /p>

=E5= =8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6

=E5=8F=91= =E4=BB=B6=E4=BA=BA=EF=BC=9Ainternet-drafts@ietf.org <internet-drafts@ietf.org>=

=E6=94=B6=E4=BB=B6=E4=BA=BA=EF= =BC=9AGregory Mirsky <gregimirsky@gmail.com>;=E6=95=96=E5=A9=B700071246;Kent Leung <kleung@cis= co.com>;Zhonghua Chen <18918588897@189.cn>;Greg Mirsky <gregimirsky@gmail.com>;

=E6=97=A5 =E6=9C= =9F =EF=BC=9A2018=E5=B9=B412= =E6=9C=8827=E6=97= =A5 16:26

=E4=B8=BB =E9=A2=98 =EF=BC= =9ANew Version Notification for draft-ao-sfc-oam-path-consistency-04= .txt


A=C2=A0new=C2=A0version=C2=A0of=C2=A0I-D,=C2=A0draft-ao-sfc-oam-path-consis= tency-04.txt
has=C2=A0been=C2=A0successfully=C2=A0submitted=C2=A0by=C2=A0Ting=C2=A0Ao=C2= =A0and=C2=A0posted=C2=A0to=C2=A0the
IETF=C2=A0repository.

Name:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0draft-ao-sfc-oam-path-= consistency
Revision:=C2=A0=C2=A0=C2=A0=C2=A004
Title:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0SFC=C2=A0OAM=C2=A0for= =C2=A0path=C2=A0consistency
Document=C2=A0date:=C2=A0=C2=A0=C2=A0=C2=A02018-12-27
Group:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Individual=C2=A0Submi= ssion
Pages:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A011
URL:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0https://www.ietf.org/internet-drafts/dr= aft-ao-sfc-oam-path-consistency-04.txt
Status:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0https://datatracker.ietf.org/doc/draft-ao-sfc-oam-path-consistency= /
Htmlized:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0http= s://tools.ietf.org/html/draft-ao-sfc-oam-path-consistency-04
Htmlized:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0https://datatracker.ietf.org/doc/html/draft-ao-sfc-oam-path-consistency<= /a>
Diff:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0https://www.ietf.org/rfcdiff?url2=3Ddraft-ao-sfc-oa= m-path-consistency-04

Abstract:
=C2=A0=C2=A0=C2=A0Service=C2=A0Function=C2=A0Chain=C2=A0(SFC)=C2=A0defines= =C2=A0an=C2=A0ordered=C2=A0set=C2=A0of=C2=A0service
=C2=A0=C2=A0=C2=A0functions=C2=A0(SFs)=C2=A0to=C2=A0be=C2=A0applied=C2=A0to= =C2=A0packets=C2=A0and/or=C2=A0frames=C2=A0and/or=C2=A0flows
=C2=A0=C2=A0=C2=A0selected=C2=A0as=C2=A0a=C2=A0result=C2=A0of=C2=A0classifi= cation.=C2=A0=C2=A0SFC=C2=A0Operation,
=C2=A0=C2=A0=C2=A0Administration=C2=A0and=C2=A0Maintenance=C2=A0can=C2=A0mo= nitor=C2=A0the=C2=A0continuity=C2=A0of=C2=A0the=C2=A0SFC,
=C2=A0=C2=A0=C2=A0i.e.,=C2=A0that=C2=A0all=C2=A0elements=C2=A0of=C2=A0the= =C2=A0SFC=C2=A0are=C2=A0reachable=C2=A0to=C2=A0each=C2=A0other=C2=A0in=C2= =A0the
=C2=A0=C2=A0=C2=A0downstream=C2=A0direction.=C2=A0=C2=A0But=C2=A0SFC=C2=A0O= AM=C2=A0must=C2=A0support=C2=A0verification=C2=A0that=C2=A0the
=C2=A0=C2=A0=C2=A0order=C2=A0of=C2=A0traversing=C2=A0these=C2=A0SFs=C2=A0co= rresponds=C2=A0to=C2=A0the=C2=A0state=C2=A0defined=C2=A0by=C2=A0the
=C2=A0=C2=A0=C2=A0SFC=C2=A0control=C2=A0plane=C2=A0or=C2=A0orchestrator,=C2= =A0the=C2=A0metric=C2=A0referred=C2=A0in=C2=A0this
=C2=A0=C2=A0=C2=A0document=C2=A0as=C2=A0the=C2=A0path=C2=A0consistency=C2= =A0of=C2=A0the=C2=A0SFC.=C2=A0=C2=A0This=C2=A0document=C2=A0defines=C2=A0a<= br> =C2=A0=C2=A0=C2=A0new=C2=A0SFC=C2=A0OAM=C2=A0method=C2=A0to=C2=A0support=C2= =A0SFC=C2=A0consistency=C2=A0check,=C2=A0i.e.
=C2=A0=C2=A0=C2=A0verification=C2=A0that=C2=A0all=C2=A0elements=C2=A0of=C2= =A0the=C2=A0given=C2=A0SFC=C2=A0are=C2=A0being=C2=A0traversed
=C2=A0=C2=A0=C2=A0in=C2=A0the=C2=A0expected=C2=A0order.

=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=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=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


Please=C2=A0note=C2=A0that=C2=A0it=C2=A0may=C2=A0take=C2=A0a=C2=A0couple=C2= =A0of=C2=A0minutes=C2=A0from=C2=A0the=C2=A0time=C2=A0of=C2=A0submission
until=C2=A0the=C2=A0htmlized=C2=A0version=C2=A0and=C2=A0diff=C2=A0are=C2=A0= available=C2=A0at=C2=A0= tools.ietf.org.

The=C2=A0IETF=C2=A0Secretariat

=C2=A0

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--000000000000fefda505812efbda-- From nobody Tue Feb 5 19:44:05 2019 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 CD9B2128D09; Tue, 5 Feb 2019 19:44:03 -0800 (PST) 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: 6.91.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: sfc@ietf.org Message-ID: <154942464378.32120.2393138355973800891@ietfa.amsl.com> Date: Tue, 05 Feb 2019 19:44:03 -0800 Archived-At: Subject: [sfc] I-D Action: draft-eastlake-sfc-nsh-ecn-support-03.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Feb 2019 03:44:04 -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 : Explicit Congestion Notification (ECN) and Congestion Feedback Using the Network Service Header (NSH) Authors : Donald E. Eastlake Bob Briscoe Andrew G. Malis Filename : draft-eastlake-sfc-nsh-ecn-support-03.txt Pages : 21 Date : 2019-02-05 Abstract: Explicit congestion notification (ECN) allows a forwarding element to notify downstream devices of the onset of congestion without having to drop packets. Coupled with a means to feed back information about congestion to upstream nodes, this can improve network efficiency through better congestion control, frequently without packet drops. This document specifies ECN and congestion feedback support within a Service Function Chaining (SFC) domain through use of the Network Service Header (NSH, RFC 8300) and IP Flow Information Export (IPFIX, draft-ietf-tsvwg-tunnel-congestion-feedback). The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-eastlake-sfc-nsh-ecn-support/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-eastlake-sfc-nsh-ecn-support-03 https://datatracker.ietf.org/doc/html/draft-eastlake-sfc-nsh-ecn-support-03 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-eastlake-sfc-nsh-ecn-support-03 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 Tue Feb 5 22:08:38 2019 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 12916126C7E for ; Tue, 5 Feb 2019 22:08:37 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.75 X-Spam-Level: X-Spam-Status: No, score=-1.75 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, 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 hQ8dQDhYi_cH for ; Tue, 5 Feb 2019 22:08:35 -0800 (PST) Received: from mail-it1-x130.google.com (mail-it1-x130.google.com [IPv6:2607:f8b0:4864:20::130]) (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 B84C912426E for ; Tue, 5 Feb 2019 22:08:35 -0800 (PST) Received: by mail-it1-x130.google.com with SMTP id h193so3631111ita.5 for ; Tue, 05 Feb 2019 22:08:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=cWmsY0H/I/ZqZKaot3LnYNNgEo3SOdN1+F5BjJKzbW4=; b=f9iMV163HYSoGC9NKJfNaEaQePsIhZeQW2gAwXKOGe0n5iaPvsKKj05yGsqXnu/BCz WFjDl28FLpr6wEDh2hrlSvy+XRP+CkqevZpshGzicW83As5Fi/oJEeHjyaPNFs0v+xxi 7Sx7sEbF5JgZEePfq26QOey32pVrtE0GFJZNJK7GUlgfSKD3H3QBw1OHaaam3bMeQdsg tplrrRBIHjPXIAp9xMP6z8hUe0B3J/KakLU7nFftjYsRTujQiDGAQwkLXQZJ4mBMMBzi Hy+mZS9LBwnOhoaHUaJrCMv+Bhkf4S80BiNtxs5goblF6itt/XxU6LVwfzukrS9JLwW0 K3ig== 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=cWmsY0H/I/ZqZKaot3LnYNNgEo3SOdN1+F5BjJKzbW4=; b=ZxZwdhBT5olNCIH46+lZ+3+XrA/g2dY6sDPaEie81L04PUCRwVxN6mcZJIPG32HVIi RvG65q8ZCmJAR6iDmPNlyNJvjPsiDO+daJ2fvBjQU5Zvg5P04ugeK1pYzSRMtJTH7TXP kDUeX27AjaVwYBx7DTXSAtEKvxCO2Z9FAje2imFHrxATEC+VB7QoGe71vAfPkOl93xJN ZD3h2IArZMorcUv9qE5mR3PtDAohkAwcAF61MzooXw48T+zM0nKXidptDcx1R4pFR1Qn yMhzXm4R2diwzyfqrbzVngGmDfjrd/gOm8xVYbbLkstb2xe9zXZliDje17PDhwdU1Vvh yRmQ== X-Gm-Message-State: AHQUAuYYZlW1vRkTWFCcP4gyLoJNaIWKamYjioxLHhLIJSr4CCk69sy0 xCnQOHWR1TSPSsdfp9A1Y/GyfCIZsDl9JxVJD99oug== X-Google-Smtp-Source: AHgI3IZAzXAEXtsZc7B3mutdIUv8VG0fEWCoaPMkJeQ6IbZd4s4H+g5S44tr4HMgC1Xzj0/SAASWIW6htYiIVUHxbAc= X-Received: by 2002:a6b:5006:: with SMTP id e6mr5205819iob.132.1549433314843; Tue, 05 Feb 2019 22:08:34 -0800 (PST) MIME-Version: 1.0 References: <2a7e8ef0-4528-663e-89f6-51a0ea729013@joelhalpern.com> In-Reply-To: From: Donald Eastlake Date: Wed, 6 Feb 2019 01:08:23 -0500 Message-ID: To: Anoop Ghanwani Cc: "sfc@ietf.org" Content-Type: text/plain; charset="UTF-8" Archived-At: Subject: Re: [sfc] Regarding draft-eastlake-sfc-nsh-ecn-support adoption call X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Feb 2019 06:08:37 -0000 Hi Anoop, I'm willing to consider removing a lot of this but I don't understand what's wrong with Section 1.3, item (3). Say you are a provider of SFC services to many clients and client session are relatively long lived and the services required by a client session can be provided through any one of multiple SFF paths. When a new client session starts, wouldn't the classified want to have congestion information about the SFF paths in use by existing client sessions when choosing the SFF path to be used by the new session? Thanks, Donald =============================== Donald E. Eastlake 3rd +1-508-333-2270 (cell) 1424 Pro Shop Court, Davenport, FL 33896 USA d3e3e3@gmail.com On Mon, Jan 28, 2019 at 4:23 PM Anoop Ghanwani wrote: > > Hi Joel, > > If that is truly the case, then I think Sections 1.3 and 4 should be removed. > > Otherwise, I myself am not clear what 1.3 and 4 are trying to > accomplish and therefore would need clarification on that from the > authors. > > Thanks, > Anoop > > On Mon, Jan 28, 2019 at 1:20 PM Joel Halpern Direct > wrote: > > > > I am pretty sure that what is intended is exactly what you say you > > support, namely simple propagation of the information for the ECN > > control loop, not a new loop. > > > > Can you suggest additional or modified owrding for the document to help > > make this clear to readers? > > > > Thank you, > > Joel > > > > On 1/28/19 4:18 PM, Anoop Ghanwani wrote: > > > I read the draft and had a clarification question about Section 1.3 > > > and Section 4. > > > > > > Is the draft suggestion an alternate congestion control mechanism > > > between tunnel ingress and tunnel egress which is working separately > > > from end-to-end congestion control that requires ECN? > > > > > > If it's just about propagation of bits for the original feedback loop > > > (i.e. before the tunnel header is added), I support the draft. If > > > it's attempting to define a new congestion feedback loop and > > > mechanism, I think it may need more discussion. > > > > > > Thanks, > > > Anoop > > > > > > On Wed, Jan 23, 2019 at 3:14 PM Joel M. Halpern wrote: > > >> > > >> While the time for the call has completed, I would like to see the > > >> current discussion resolve before judging the adoption as chair (with Jim). > > >> As a corollary, if anyone who has not spoken up has an opinion about the > > >> adoption, it is still VERY helpful if you speak up. Please provide > > >> motivation for your response. > > >> > > >> If things do not resolve clearly on their own, the chairs will (as is > > >> required) reach a determination anyway, but WG clarity is preferred. > > >> > > >> Thank you, > > >> Joel > > >> > > >> _______________________________________________ > > >> sfc mailing list > > >> sfc@ietf.org > > >> https://www.ietf.org/mailman/listinfo/sfc > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc From nobody Tue Feb 5 23:35:04 2019 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 5B010126C7E for ; Tue, 5 Feb 2019 23:35:01 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -19.053 X-Spam-Level: X-Spam-Status: No, score=-19.053 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-4.553, 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, 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 aL196f3UFBqa for ; Tue, 5 Feb 2019 23:34:58 -0800 (PST) Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9E40112426E for ; Tue, 5 Feb 2019 23:34:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=34218; q=dns/txt; s=iport; t=1549438498; x=1550648098; h=from:to:cc:subject:date:message-id:mime-version; bh=IhMzQ0dENbnPvUbI+JIM6o/NyvXTXGkd+b4w8wMz+fc=; b=WcVgxb6GSpeGpzEti/SbAS0v9dPaaJVjdWVoynO1TY/eoPL94RVhXE19 K0eYGWtMpZt6gudGwqn80oxi94QqlpMc2w9FsSZ/SGc2XL+wmjQV7OLeJ 2Y7iCNOqdhrGKJ6RcgOaV126RXGInpXU0r1C9dNV5s8lpY98fU2BbcxsO s=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0AFAADBjFpc/5hdJa1lGgEBAQEBAgE?= =?us-ascii?q?BAQEHAgEBAQGBUQUBAQEBCwGBDXZngQMnCoN5iBqLdYINmA8UgWMECwEBGAE?= =?us-ascii?q?KhEkZgn0iNAkNAQMBAQIBAQJtHAELhUoBAQEDAQEBIQpBCwUNAQYCFQIWCwE?= =?us-ascii?q?GAwIEJQsUCQoEDgWDIgGBHVwID5B0m2GBL4QvAQMCAoYCBYsBgUIXgUA/gRE?= =?us-ascii?q?nH4JMgx4BAQIBgRmBBIJKMYImApAXhwqLZgkChzWDY4coGZJMiiyFMowPAhE?= =?us-ascii?q?UgScfOIFWcBU7KgGCQYIoF4hfhT9BMY1bgR8BAQ?= X-IronPort-AV: E=Sophos;i="5.58,339,1544486400"; d="scan'208,217";a="516540526" Received: from rcdn-core-1.cisco.com ([173.37.93.152]) by rcdn-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 06 Feb 2019 07:34:57 +0000 Received: from XCH-RCD-006.cisco.com (xch-rcd-006.cisco.com [173.37.102.16]) by rcdn-core-1.cisco.com (8.15.2/8.15.2) with ESMTPS id x167YvQj006796 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=FAIL); Wed, 6 Feb 2019 07:34:57 GMT Received: from xch-aln-008.cisco.com (173.36.7.18) by XCH-RCD-006.cisco.com (173.37.102.16) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 6 Feb 2019 01:30:11 -0600 Received: from xch-aln-008.cisco.com ([173.36.7.18]) by XCH-ALN-008.cisco.com ([173.36.7.18]) with mapi id 15.00.1395.000; Wed, 6 Feb 2019 01:30:11 -0600 From: "Shwetha Bhandari (shwethab)" To: "sfc@ietf.org" CC: "Frank Brockners (fbrockne)" , "ao.ting@zte.com.cn" , "jmh@joelhalpern.com" Thread-Topic: [sfc] proof-of-transit: continue with both approaches, or choose one? Thread-Index: AQHUve3Lk4VCtKb1h06TlQw6hN+tFg== Date: Wed, 6 Feb 2019 07:30:11 +0000 Message-ID: <132127FF-2EBF-4C72-8BC6-BC5015960B00@cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/10.10.5.181209 x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.196.85.53] Content-Type: multipart/alternative; boundary="_000_132127FF2EBF4C728BC6BC5015960B00ciscocom_" MIME-Version: 1.0 X-Outbound-SMTP-Client: 173.37.102.16, xch-rcd-006.cisco.com X-Outbound-Node: rcdn-core-1.cisco.com Archived-At: Subject: Re: [sfc] proof-of-transit: continue with both approaches, or choose one? 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--_000_132127FF2EBF4C728BC6BC5015960B00ciscocom_-- From nobody Wed Feb 6 11:11:59 2019 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 DBBA3130F55 for ; Wed, 6 Feb 2019 11:11:44 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.701 X-Spam-Level: X-Spam-Status: No, score=-2.701 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] 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 1vD7C00qAtIN for ; Wed, 6 Feb 2019 11:11:42 -0800 (PST) Received: from maila2.tigertech.net (maila2.tigertech.net [208.80.4.152]) (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 788BA130FA0 for ; Wed, 6 Feb 2019 11:11:41 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by maila2.tigertech.net (Postfix) with ESMTP id 43vrf52WvLz1W36f; Wed, 6 Feb 2019 11:11:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=2.tigertech; t=1549480301; bh=eNWLRDuOBJ8B/a/Ivc0Q3bNS9ORCaCpukdFyf7uuYgM=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=BV+N2rtXYA7fkXNC9mOkSIiBYJ3HeZhlT4Ko0sSnUKOSqCnt0gvTM8FXuOsV8HBZ1 K269bKMI3ScZD8uoEEMa+oyHwzZeV/KRccUMqeEgNNX9lB+4ctSvcEsX3vBJZCi8Gu qjur07/ldVJ1TuvmDuMyGExaCxrUAUsex6U4myh4= X-Virus-Scanned: Debian amavisd-new at maila2.tigertech.net Received: from Joels-MacBook-Pro.local (209-255-163-147.ip.mcleodusa.net [209.255.163.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 43vrf44NCnz1W38d; Wed, 6 Feb 2019 11:11:40 -0800 (PST) To: "sfc@ietf.org" Cc: "Shwetha Bhandari (shwethab)" , "Frank Brockners (fbrockne)" References: <132127FF-2EBF-4C72-8BC6-BC5015960B00@cisco.com> From: "Joel M. Halpern" Message-ID: Date: Wed, 6 Feb 2019 14:11:39 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.5.0 MIME-Version: 1.0 In-Reply-To: <132127FF-2EBF-4C72-8BC6-BC5015960B00@cisco.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [sfc] proof-of-transit: continue with both approaches, or choose one? X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Feb 2019 19:11:49 -0000 The working group has not said much. From what little we have seen, and from the judgment of the chairs, the document editors should make the changes to focus on SSSS. Thank you, Joel (& Jim) On 2/6/19 2:30 AM, Shwetha Bhandari (shwethab) wrote: > As a co-author and implementor of the SSSS approach, I would also prefer > keeping it as the only approach for proof of transit and remove the > nested encryption related text. > > Thanks, > > Shwetha > > From: > To: > Cc: , > > Subject: Re: [sfc] > =?utf-8?q?proof-of-transit=3A_continue_with_both_approache?= > =?utf-8?q?s=2Cor_choose_one=3F?= > > I agree with Joel. Since SSSS already has mechanism to provide ordered > verification requirment, only this one approach is enough. > > Regards. > > 敖婷Ting Ao > > 原始邮件 > > 发件人：JoelM.Halpern ; > > 收件人：Frank Brockners (fbrockne) ;sfc@ietf.org > ;; > > 日期：2018年12月17日04:53 > > 主题：Re: [sfc] proof-of-transit: continue with both approaches,or > choose one? > > > > Personally, the argument for just using SSSS, given that it now can > > provide ordered verification, seems quite persuasive to me. > > Yours, > > Joel > > > > On 12/15/18 3:19 PM, Frank Brockners (fbrockne) wrote: > >> During the SFC WG at IETF 103 in Bangkok we raised the question, whether > >> we could simplify the draft and choose a single algorithm for > >> proof-of-transit only (see also > >> https://datatracker.ietf.org/meeting/103/materials/minutes-103-sfc-01). > >> Given that we could not come to a conclusion, we decided to take the > >> discussion to the list. > >> > >> Background: > >> > >> draft-ietf-sfc-proof-of-transit-01 describes two different approaches: > >> “nested encryption” and “Shamir’s secret sharing scheme (SSSS)”... We > >> documented both approaches in the initial version of the draft, because > >> the two approaches had different qualities: While SSSS was > >> computationally cheaper (each node only needs to perform two additions, > >> a multiplication and a modulo-division), nested-encryption allowed to > >> verify that packets traversed a set of nodes in a particular order > >> (“ordered POT - OPOT”) – something that the SSSS-approach in the initial > >> version of the draft did not offer. With the changes discussed in IETF > >> 102 and now documented in draft-ietf-sfc-proof-of-transit-01, both > >> approaches offer order preservation. > >> > >> In summary, we can now observe the following qualities of the two > >> approaches: > >> > >>   * SSSS: Allows verification that a given set of nodes has been > >>     traversed in a specific order (POT and OPOT). SSSS without order > >>     preservation requires 2 additions, 1 multiplication, 1 division per > >>     node participating in POT. Order preservation on top of that > >>     requires an additional XOR (or similar). > >>   * Nested-encryption: Allows verification that a given set of nodes has > >>     been traversed in a specific order (POT and OPOT). The computational > >>     effort of nested encryption depends on the crypto algorithm chosen > >>     and typically higher than SSSS, i.e.. it requires/benefits from > >>     hardware with specific capabilities (e.g. AES-NI). > >> > >> Question: > >> > >> Given that both approaches both solve the problem of POT and ordered > >> POT, should we consider simplifying the draft and describe only a single > >> approach? If so, which approach should we choose? > >> > >> I.e. when taking the computational effort into account and the fact that > >> options increase the burden for any implementor, we could decide to only > >> describe the SSSS approach in the draft. > >> > >> Thoughts? Opinions? > >> > >> Many thanks, Frank > >> > >> > >> > >> _______________________________________________ > >> sfc mailing list > >> sfc@ietf.org > >> https://www.ietf.org/mailman/listinfo/sfc > >> > > _______________________________________________ > > sfc mailing list > > sfc@ietf.org > > https://www.ietf.org/mailman/listinfo/sfc > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > From nobody Thu Feb 7 08:54:20 2019 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 8482D124BF6 for ; Thu, 7 Feb 2019 08:54:17 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.021 X-Spam-Level: X-Spam-Status: No, score=0.021 tagged_above=-999 required=5 tests=[FREEMAIL_FORGED_FROMDOMAIN=0.018, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, 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 BRzmOjEJuUj9 for ; Thu, 7 Feb 2019 08:54:14 -0800 (PST) Received: from mail-vk1-f173.google.com (mail-vk1-f173.google.com [209.85.221.173]) (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 46B0A1200D8 for ; Thu, 7 Feb 2019 08:54:14 -0800 (PST) Received: by mail-vk1-f173.google.com with SMTP id r127so136532vkf.2 for ; Thu, 07 Feb 2019 08:54:14 -0800 (PST) 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=s65ysNVg7+1TWsECTZk8j2oMgpVxMavrjoVzh/DtiWs=; b=TouoUfrMspUmU60ERjFxj6H+2I8vFMQEAgFpbTpZ921RTYZ6xmHvgxDB3GLNbNzkkp WlYcdjM2YW2fI8klKxaqHDkFY+A2VlEsmnOF+Rc3QB21t+8qJ7TjvNxJXxK/WMtoAhkT 1eChi6LcO16J/G1iAHd5iAeYhsxXzGRAGejsxwRvhF4KT/shOozg+j0dtzgwRgvZKSLW XVSjLjKO8I9dCnPoeF8SKLjhZXDPgSBfPB6/MvVxSLvYeHliYnf+9MTHAS9OrLWhHU30 hdXAKgt5/vnrLSDsL6l8B5nsjmZrz0O65ceKE/nTggpBv2jOUhJDy60DwUmEA4fuYJ+L utSQ== X-Gm-Message-State: AHQUAubYKMfffL1UhNTOuVzvZOki8L1Wlz2MS3/4uCOO2tFRAPFuz1+U rlUWE12RybZqBv7j7svGX3avdKAG/K9hiTktP5g= X-Google-Smtp-Source: AHgI3IaN8XUIys3a1OjQ6mMWItCQkib+Ua6MdR2D2Tx949GusWbzSOfVonsWMEibk+UWyJaTlD4aNW5PJ4UpNjEimlo= X-Received: by 2002:a1f:3093:: with SMTP id w141mr6778039vkw.32.1549558453018; Thu, 07 Feb 2019 08:54:13 -0800 (PST) MIME-Version: 1.0 References: <2a7e8ef0-4528-663e-89f6-51a0ea729013@joelhalpern.com> In-Reply-To: From: Anoop Ghanwani Date: Thu, 7 Feb 2019 08:54:01 -0800 Message-ID: To: Donald Eastlake Cc: "sfc@ietf.org" Content-Type: multipart/alternative; boundary="00000000000026a3e2058150b192" Archived-At: Subject: Re: [sfc] Regarding draft-eastlake-sfc-nsh-ecn-support adoption call X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Feb 2019 16:54:18 -0000 --00000000000026a3e2058150b192 Content-Type: text/plain; charset="UTF-8" Hi Donald, The functions are useful. I just think they need more discussion before it can be put in a WG document. What is being suggested would be useful for any tunneling technology, not just SFC. And that's why it would need wider discussion as to what information should be fed to the tunnel ingress. A couple of issues for example: - How does one treat ECT vs non-ECT sessions when making these decisions? - How do we know the feedback is accurate if there are no ECT sessions? The document becomes a lot more straightforward if all it is dealing with is propagation of ECN bits from inner to outer header and vice versa. Thanks, Anoop On Tue, Feb 5, 2019 at 10:08 PM Donald Eastlake wrote: > Hi Anoop, > > I'm willing to consider removing a lot of this but I don't understand > what's wrong with Section 1.3, item (3). Say you are a provider of SFC > services to many clients and client session are relatively long lived > and the services required by a client session can be provided through > any one of multiple SFF paths. When a new client session starts, > wouldn't the classified want to have congestion information about the > SFF paths in use by existing client sessions when choosing the SFF > path to be used by the new session? > > Thanks, > Donald > =============================== > Donald E. Eastlake 3rd +1-508-333-2270 (cell) > 1424 Pro Shop Court, Davenport, FL 33896 USA > d3e3e3@gmail.com > > On Mon, Jan 28, 2019 at 4:23 PM Anoop Ghanwani > wrote: > > > > Hi Joel, > > > > If that is truly the case, then I think Sections 1.3 and 4 should be > removed. > > > > Otherwise, I myself am not clear what 1.3 and 4 are trying to > > accomplish and therefore would need clarification on that from the > > authors. > > > > Thanks, > > Anoop > > > > On Mon, Jan 28, 2019 at 1:20 PM Joel Halpern Direct > > wrote: > > > > > > I am pretty sure that what is intended is exactly what you say you > > > support, namely simple propagation of the information for the ECN > > > control loop, not a new loop. > > > > > > Can you suggest additional or modified owrding for the document to help > > > make this clear to readers? > > > > > > Thank you, > > > Joel > > > > > > On 1/28/19 4:18 PM, Anoop Ghanwani wrote: > > > > I read the draft and had a clarification question about Section 1.3 > > > > and Section 4. > > > > > > > > Is the draft suggestion an alternate congestion control mechanism > > > > between tunnel ingress and tunnel egress which is working separately > > > > from end-to-end congestion control that requires ECN? > > > > > > > > If it's just about propagation of bits for the original feedback loop > > > > (i.e. before the tunnel header is added), I support the draft. If > > > > it's attempting to define a new congestion feedback loop and > > > > mechanism, I think it may need more discussion. > > > > > > > > Thanks, > > > > Anoop > > > > > > > > On Wed, Jan 23, 2019 at 3:14 PM Joel M. Halpern > wrote: > > > >> > > > >> While the time for the call has completed, I would like to see the > > > >> current discussion resolve before judging the adoption as chair > (with Jim). > > > >> As a corollary, if anyone who has not spoken up has an opinion > about the > > > >> adoption, it is still VERY helpful if you speak up. Please provide > > > >> motivation for your response. > > > >> > > > >> If things do not resolve clearly on their own, the chairs will (as > is > > > >> required) reach a determination anyway, but WG clarity is preferred. > > > >> > > > >> Thank you, > > > >> Joel > > > >> > > > >> _______________________________________________ > > > >> sfc mailing list > > > >> sfc@ietf.org > > > >> https://www.ietf.org/mailman/listinfo/sfc > > > > _______________________________________________ > > sfc mailing list > > sfc@ietf.org > > https://www.ietf.org/mailman/listinfo/sfc > --00000000000026a3e2058150b192 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Donald,

The functio= ns are useful.=C2=A0 I just think they need more discussion before it can b= e put in a WG document.=C2=A0 What is being suggested would be useful for a= ny tunneling technology, not just SFC.=C2=A0 And that's why it would ne= ed wider discussion as to what information should be fed to the tunnel ingr= ess.=C2=A0=C2=A0

A couple of issues for example:
- How does one treat ECT vs non-ECT sessions when making these dec= isions?=C2=A0
- How do we know the feedback is accurate if there = are no ECT sessions?

The document becomes a lot mo= re straightforward if all it is dealing with is propagation of ECN bits fro= m inner to outer header and vice versa.

Thanks,
Anoop

On Tue, Feb 5, 2019 at 10:08 PM Donald Eastlake <d3e3e3@gmail.com> wrote:
Hi Anoop,

I'm willing to consider removing a lot of this but I don't understa= nd
what's wrong with Section 1.3, item (3). Say you are a provider of SFC<= br> services to many clients and client session are relatively long lived
and the services required by a client session can be provided through
any one of multiple SFF paths. When a new client session starts,
wouldn't the classified want to have congestion information about the SFF paths in use by existing client sessions when choosing the SFF
path to be used by the new session?

Thanks,
Donald
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D
=C2=A0Donald E. Eastlake 3rd=C2=A0 =C2=A0+1-508-333-2270 (cell)
=C2=A01424 Pro Shop Court, Davenport, FL 33896 USA
=C2=A0d3e3e3@gmail.co= m

On Mon, Jan 28, 2019 at 4:23 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
>
> Hi Joel,
>
> If that is truly the case, then I think Sections 1.3 and 4 should be r= emoved.
>
> Otherwise, I myself am not clear what 1.3 and 4 are trying to
> accomplish and therefore would need clarification on that from the
> authors.
>
> Thanks,
> Anoop
>
> On Mon, Jan 28, 2019 at 1:20 PM Joel Halpern Direct
> <jm= h.direct@joelhalpern.com> wrote:
> >
> > I am pretty sure that what is intended is exactly what you say yo= u
> > support, namely simple propagation of the information for the ECN=
> > control loop, not a new loop.
> >
> > Can you suggest additional or modified owrding for the document t= o help
> > make this clear to readers?
> >
> > Thank you,
> > Joel
> >
> > On 1/28/19 4:18 PM, Anoop Ghanwani wrote:
> > > I read the draft and had a clarification question about Sect= ion 1.3
> > > and Section 4.
> > >
> > > Is the draft suggestion an alternate congestion control mech= anism
> > > between tunnel ingress and tunnel egress which is working se= parately
> > > from end-to-end congestion control that requires ECN?
> > >
> > > If it's just about propagation of bits for the original = feedback loop
> > > (i.e. before the tunnel header is added), I support the draf= t.=C2=A0 If
> > > it's attempting to define a new congestion feedback loop= and
> > > mechanism, I think it may need more discussion.
> > >
> > > Thanks,
> > > Anoop
> > >
> > > On Wed, Jan 23, 2019 at 3:14 PM Joel M. Halpern <jmh@joelhalpern.com&g= t; wrote:
> > >>
> > >> While the time for the call has completed, I would like = to see the
> > >> current discussion resolve before judging the adoption a= s chair (with Jim).
> > >> As a corollary, if anyone who has not spoken up has an o= pinion about the
> > >> adoption, it is still VERY helpful if you speak up.=C2= =A0 Please provide
> > >> motivation for your response.
> > >>
> > >> If things do not resolve clearly on their own, the chair= s will (as is
> > >> required) reach a determination anyway, but WG clarity i= s preferred.
> > >>
> > >> Thank you,
> > >> Joel
> > >>
> > >> _______________________________________________
> > >> sfc mailing list
> > >> sfc@ie= tf.org
> > >> https://www.ietf.org/mailman/listinfo/sf= c
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
--00000000000026a3e2058150b192-- From nobody Thu Feb 7 09:17:55 2019 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 9B62012E04D for ; Thu, 7 Feb 2019 09:17:53 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.8 X-Spam-Level: X-Spam-Status: No, score=-0.8 tagged_above=-999 required=5 tests=[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 VEs3j0r24rt4 for ; Thu, 7 Feb 2019 09:17:51 -0800 (PST) Received: from maila2.tigertech.net (maila2.tigertech.net [208.80.4.152]) (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 BA6AC12D7F8 for ; Thu, 7 Feb 2019 09:17:51 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by maila2.tigertech.net (Postfix) with ESMTP id 43wQ4H3S0WzKnfr; Thu, 7 Feb 2019 09:17:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=2.tigertech; t=1549559871; bh=Sz9dwRlh1ymuan8D+R7j8okTmKbaUsfTz2u/7GpwCbI=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=G0EAiFZHltCVFd+6Dc2QWIAJv2w0DLRtjQMgweAhI0xFV0RK9zseQy16yLTJceRvO Ox6jfT5p5C5cblJr2M9AAVXQYdR8QfBnSaciliewhuYLNehkzU5rClNFBgQ6813Fuy pAdq/iI1ibLEgc5lP6/+UKHOGHRFqYFXoPNlls9Q= X-Virus-Scanned: Debian amavisd-new at maila2.tigertech.net Received: from Joels-MacBook-Pro.local (209-255-163-147.ip.mcleodusa.net [209.255.163.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 43wQ4G4DHvzKnGR; Thu, 7 Feb 2019 09:17:50 -0800 (PST) To: Anoop Ghanwani , Donald Eastlake Cc: "sfc@ietf.org" References: <2a7e8ef0-4528-663e-89f6-51a0ea729013@joelhalpern.com> From: "Joel M. Halpern" Message-ID: Date: Thu, 7 Feb 2019 12:17:49 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.5.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [sfc] Regarding draft-eastlake-sfc-nsh-ecn-support adoption call X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Feb 2019 17:17:54 -0000 Isn't a lot of that general discussion already captured in RFC 6040? Yours, Joel On 2/7/19 11:54 AM, Anoop Ghanwani wrote: > Hi Donald, > > The functions are useful.  I just think they need more discussion before > it can be put in a WG document.  What is being suggested would be useful > for any tunneling technology, not just SFC.  And that's why it would > need wider discussion as to what information should be fed to the tunnel > ingress. > > A couple of issues for example: > - How does one treat ECT vs non-ECT sessions when making these decisions? > - How do we know the feedback is accurate if there are no ECT sessions? > > The document becomes a lot more straightforward if all it is dealing > with is propagation of ECN bits from inner to outer header and vice versa. > > Thanks, > Anoop > > On Tue, Feb 5, 2019 at 10:08 PM Donald Eastlake > wrote: > > Hi Anoop, > > I'm willing to consider removing a lot of this but I don't understand > what's wrong with Section 1.3, item (3). Say you are a provider of SFC > services to many clients and client session are relatively long lived > and the services required by a client session can be provided through > any one of multiple SFF paths. When a new client session starts, > wouldn't the classified want to have congestion information about the > SFF paths in use by existing client sessions when choosing the SFF > path to be used by the new session? > > Thanks, > Donald > =============================== >  Donald E. Eastlake 3rd   +1-508-333-2270 (cell) >  1424 Pro Shop Court, Davenport, FL 33896 USA > d3e3e3@gmail.com > > On Mon, Jan 28, 2019 at 4:23 PM Anoop Ghanwani > > wrote: > > > > Hi Joel, > > > > If that is truly the case, then I think Sections 1.3 and 4 should > be removed. > > > > Otherwise, I myself am not clear what 1.3 and 4 are trying to > > accomplish and therefore would need clarification on that from the > > authors. > > > > Thanks, > > Anoop > > > > On Mon, Jan 28, 2019 at 1:20 PM Joel Halpern Direct > > > > wrote: > > > > > > I am pretty sure that what is intended is exactly what you say you > > > support, namely simple propagation of the information for the ECN > > > control loop, not a new loop. > > > > > > Can you suggest additional or modified owrding for the document > to help > > > make this clear to readers? > > > > > > Thank you, > > > Joel > > > > > > On 1/28/19 4:18 PM, Anoop Ghanwani wrote: > > > > I read the draft and had a clarification question about > Section 1.3 > > > > and Section 4. > > > > > > > > Is the draft suggestion an alternate congestion control mechanism > > > > between tunnel ingress and tunnel egress which is working > separately > > > > from end-to-end congestion control that requires ECN? > > > > > > > > If it's just about propagation of bits for the original > feedback loop > > > > (i.e. before the tunnel header is added), I support the > draft.  If > > > > it's attempting to define a new congestion feedback loop and > > > > mechanism, I think it may need more discussion. > > > > > > > > Thanks, > > > > Anoop > > > > > > > > On Wed, Jan 23, 2019 at 3:14 PM Joel M. Halpern > > wrote: > > > >> > > > >> While the time for the call has completed, I would like to > see the > > > >> current discussion resolve before judging the adoption as > chair (with Jim). > > > >> As a corollary, if anyone who has not spoken up has an > opinion about the > > > >> adoption, it is still VERY helpful if you speak up.  Please > provide > > > >> motivation for your response. > > > >> > > > >> If things do not resolve clearly on their own, the chairs > will (as is > > > >> required) reach a determination anyway, but WG clarity is > preferred. > > > >> > > > >> Thank you, > > > >> Joel > > > >> > > > >> _______________________________________________ > > > >> sfc mailing list > > > >> sfc@ietf.org > > > >> https://www.ietf.org/mailman/listinfo/sfc > > > > _______________________________________________ > > sfc mailing list > > sfc@ietf.org > > https://www.ietf.org/mailman/listinfo/sfc > > > _______________________________________________ > sfc mailing list > sfc@ietf.org > https://www.ietf.org/mailman/listinfo/sfc > From nobody Thu Feb 7 10:10:49 2019 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 7220D129A87 for ; Thu, 7 Feb 2019 10:10:36 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.02 X-Spam-Level: X-Spam-Status: No, score=0.02 tagged_above=-999 required=5 tests=[FREEMAIL_FORGED_FROMDOMAIN=0.018, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, 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 5ndUnTAy1OrW for ; Thu, 7 Feb 2019 10:10:32 -0800 (PST) Received: from mail-vs1-f41.google.com (mail-vs1-f41.google.com [209.85.217.41]) (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 AF8DF129284 for ; Thu, 7 Feb 2019 10:10:31 -0800 (PST) Received: by mail-vs1-f41.google.com with SMTP id u11so472217vsp.11 for ; Thu, 07 Feb 2019 10:10:31 -0800 (PST) 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=JNxgJNS/9Kok0lFy2P7XODlEk2FGpHmoRlW9hHOM11g=; b=RmlHIUJ67A/uEfsAaApJovIlwXZmdbzqn3zlxpc9fahZ8vTfgwaZJLyRtyQeAHXq9z VkHAedORR9EKueS0mPdHnjVlgFNvfo3lP99TrQvEp4/ULXepisdU2XWu0ZYYxmEnpCjy VYlqf8TtO2ucBrJGip3903//+FdUeAjJGKWlaliLTyIGighcHwC5EcwXZ21TDNiMoyyI 4PpifTPmh4wAwyQUWn5Ibxp7zdMbaVlvOET/9+Lj/5R8gX1qYyqTKeKrczRurO3OdKcD NqqKqFdqOcpLow/Ix4Sy+qstuMGF17qsyMJtMrhvdvBKnWW4AcHt2csqKoFC+91k9Y4K JtpQ== X-Gm-Message-State: AHQUAuYOoWqtcH6RgqE+Mr8lmbWCXQo+06C+oJKWqIXLV2SFj0ctdVTb p2CHK0CuhPSjoxD7AC8uFPok/gFWW1tWa5s2AOA= X-Google-Smtp-Source: AHgI3IYPC0LsEOEanxbaODdU4is+rsxALuuKrJGlBE4yINc1oMWeCyCAe9N+4UmAQug7pgG6I544L+ISa04D+m/vIbo= X-Received: by 2002:a67:4bcd:: with SMTP id f74mr7454556vsg.60.1549563030564; Thu, 07 Feb 2019 10:10:30 -0800 (PST) MIME-Version: 1.0 References: <2a7e8ef0-4528-663e-89f6-51a0ea729013@joelhalpern.com> In-Reply-To: From: Anoop Ghanwani Date: Thu, 7 Feb 2019 10:10:19 -0800 Message-ID: To: "Joel M. Halpern" Cc: Donald Eastlake , "sfc@ietf.org" Content-Type: multipart/alternative; boundary="000000000000fe738d058151c187" Archived-At: Subject: Re: [sfc] Regarding draft-eastlake-sfc-nsh-ecn-support adoption call X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Feb 2019 18:10:36 -0000 --000000000000fe738d058151c187 Content-Type: text/plain; charset="UTF-8" Hi Joel, I'm specifically referring to how the tunnel ingress should react to congestion reports in terms of traffic engineering (selecting one tunnel over another), which is the part that Donald is trying to retain in the draft. Is that what you're referring to? If so, can you point to a specific section in RFC 6040? I took a quick look and I'm not able to find anything about that. All I see there is about propagation of ECN bits. Thanks, Anoop On Thu, Feb 7, 2019 at 9:17 AM Joel M. Halpern wrote: > Isn't a lot of that general discussion already captured in RFC 6040? > > Yours, > Joel > > On 2/7/19 11:54 AM, Anoop Ghanwani wrote: > > Hi Donald, > > > > The functions are useful. I just think they need more discussion before > > it can be put in a WG document. What is being suggested would be useful > > for any tunneling technology, not just SFC. And that's why it would > > need wider discussion as to what information should be fed to the tunnel > > ingress. > > > > A couple of issues for example: > > - How does one treat ECT vs non-ECT sessions when making these decisions? > > - How do we know the feedback is accurate if there are no ECT sessions? > > > > The document becomes a lot more straightforward if all it is dealing > > with is propagation of ECN bits from inner to outer header and vice > versa. > > > > Thanks, > > Anoop > > > > On Tue, Feb 5, 2019 at 10:08 PM Donald Eastlake > > wrote: > > > > Hi Anoop, > > > > I'm willing to consider removing a lot of this but I don't understand > > what's wrong with Section 1.3, item (3). Say you are a provider of > SFC > > services to many clients and client session are relatively long lived > > and the services required by a client session can be provided through > > any one of multiple SFF paths. When a new client session starts, > > wouldn't the classified want to have congestion information about the > > SFF paths in use by existing client sessions when choosing the SFF > > path to be used by the new session? > > > > Thanks, > > Donald > > =============================== > > Donald E. Eastlake 3rd +1-508-333-2270 (cell) > > 1424 Pro Shop Court, Davenport, FL 33896 USA > > d3e3e3@gmail.com > > > > On Mon, Jan 28, 2019 at 4:23 PM Anoop Ghanwani > > > wrote: > > > > > > Hi Joel, > > > > > > If that is truly the case, then I think Sections 1.3 and 4 should > > be removed. > > > > > > Otherwise, I myself am not clear what 1.3 and 4 are trying to > > > accomplish and therefore would need clarification on that from the > > > authors. > > > > > > Thanks, > > > Anoop > > > > > > On Mon, Jan 28, 2019 at 1:20 PM Joel Halpern Direct > > > > > > wrote: > > > > > > > > I am pretty sure that what is intended is exactly what you say > you > > > > support, namely simple propagation of the information for the > ECN > > > > control loop, not a new loop. > > > > > > > > Can you suggest additional or modified owrding for the document > > to help > > > > make this clear to readers? > > > > > > > > Thank you, > > > > Joel > > > > > > > > On 1/28/19 4:18 PM, Anoop Ghanwani wrote: > > > > > I read the draft and had a clarification question about > > Section 1.3 > > > > > and Section 4. > > > > > > > > > > Is the draft suggestion an alternate congestion control > mechanism > > > > > between tunnel ingress and tunnel egress which is working > > separately > > > > > from end-to-end congestion control that requires ECN? > > > > > > > > > > If it's just about propagation of bits for the original > > feedback loop > > > > > (i.e. before the tunnel header is added), I support the > > draft. If > > > > > it's attempting to define a new congestion feedback loop and > > > > > mechanism, I think it may need more discussion. > > > > > > > > > > Thanks, > > > > > Anoop > > > > > > > > > > On Wed, Jan 23, 2019 at 3:14 PM Joel M. Halpern > > > wrote: > > > > >> > > > > >> While the time for the call has completed, I would like to > > see the > > > > >> current discussion resolve before judging the adoption as > > chair (with Jim). > > > > >> As a corollary, if anyone who has not spoken up has an > > opinion about the > > > > >> adoption, it is still VERY helpful if you speak up. Please > > provide > > > > >> motivation for your response. > > > > >> > > > > >> If things do not resolve clearly on their own, the chairs > > will (as is > > > > >> required) reach a determination anyway, but WG clarity is > > preferred. > > > > >> > > > > >> Thank you, > > > > >> Joel > > > > >> > > > > >> _______________________________________________ > > > > >> sfc mailing list > > > > >> sfc@ietf.org > > > > >> https://www.ietf.org/mailman/listinfo/sfc > > > > > > _______________________________________________ > > > sfc mailing list > > > sfc@ietf.org > > > https://www.ietf.org/mailman/listinfo/sfc > > > > > > _______________________________________________ > > sfc mailing list > > sfc@ietf.org > > https://www.ietf.org/mailman/listinfo/sfc > > > --000000000000fe738d058151c187 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Joel,

I'm speci= fically referring to how the tunnel ingress should react to congestion repo= rts in terms of traffic engineering (selecting one tunnel over another), wh= ich is the part that Donald is trying to retain in the draft.
Is that what you're referring to?=C2=A0 If so, can you poin= t to a specific section in RFC 6040?=C2=A0 I took a quick look and I'm = not able to find anything about that.=C2=A0 All I see there is about propag= ation of ECN bits.

Thanks,
Anoop

On= Thu, Feb 7, 2019 at 9:17 AM Joel M. Halpern <jmh@joelhalpern.com> wrote:
Isn't a lot of that general discussion= already captured in RFC 6040?

Yours,
Joel

On 2/7/19 11:54 AM, Anoop Ghanwani wrote:
> Hi Donald,
>
> The functions are useful.=C2=A0 I just think they need more discussion= before
> it can be put in a WG document.=C2=A0 What is being suggested would be= useful
> for any tunneling technology, not just SFC.=C2=A0 And that's why i= t would
> need wider discussion as to what information should be fed to the tunn= el
> ingress.
>
> A couple of issues for example:
> - How does one treat ECT vs non-ECT sessions when making these decisio= ns?
> - How do we know the feedback is accurate if there are no ECT sessions= ?
>
> The document becomes a lot more straightforward if all it is dealing <= br> > with is propagation of ECN bits from inner to outer header and vice ve= rsa.
>
> Thanks,
> Anoop
>
> On Tue, Feb 5, 2019 at 10:08 PM Donald Eastlake <d3e3e3@gmail.com
> <mailto:d3e3e= 3@gmail.com>> wrote:
>
>=C2=A0 =C2=A0 =C2=A0Hi Anoop,
>
>=C2=A0 =C2=A0 =C2=A0I'm willing to consider removing a lot of this = but I don't understand
>=C2=A0 =C2=A0 =C2=A0what's wrong with Section 1.3, item (3). Say yo= u are a provider of SFC
>=C2=A0 =C2=A0 =C2=A0services to many clients and client session are rel= atively long lived
>=C2=A0 =C2=A0 =C2=A0and the services required by a client session can b= e provided through
>=C2=A0 =C2=A0 =C2=A0any one of multiple SFF paths. When a new client se= ssion starts,
>=C2=A0 =C2=A0 =C2=A0wouldn't the classified want to have congestion= information about the
>=C2=A0 =C2=A0 =C2=A0SFF paths in use by existing client sessions when c= hoosing the SFF
>=C2=A0 =C2=A0 =C2=A0path to be used by the new session?
>
>=C2=A0 =C2=A0 =C2=A0Thanks,
>=C2=A0 =C2=A0 =C2=A0Donald
>=C2=A0 =C2=A0 =C2=A0=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=C2=A0 =C2=A0 =C2=A0 =C2=A0Donald E. Eastlake 3rd=C2=A0 =C2=A0+1-508-33= 3-2270 (cell)
>=C2=A0 =C2=A0 =C2=A0 =C2=A01424 Pro Shop Court, Davenport, FL 33896 USA=
>=C2=A0 =C2=A0 =C2=A0d3e3e3@gmail.com <mailto:d3e3e3@gmail.com>
>
>=C2=A0 =C2=A0 =C2=A0On Mon, Jan 28, 2019 at 4:23 PM Anoop Ghanwani
>=C2=A0 =C2=A0 =C2=A0<anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>> wrote: >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Hi Joel,
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > If that is truly the case, then I think Secti= ons 1.3 and 4 should
>=C2=A0 =C2=A0 =C2=A0be removed.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Otherwise, I myself am not clear what 1.3 and= 4 are trying to
>=C2=A0 =C2=A0 =C2=A0 > accomplish and therefore would need clarifica= tion on that from the
>=C2=A0 =C2=A0 =C2=A0 > authors.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Thanks,
>=C2=A0 =C2=A0 =C2=A0 > Anoop
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > On Mon, Jan 28, 2019 at 1:20 PM Joel Halpern = Direct
>=C2=A0 =C2=A0 =C2=A0 > <jmh.direct@joelhalpern.com <mailto:jmh.direct@joelhalper= n.com>>
>=C2=A0 =C2=A0 =C2=A0wrote:
>=C2=A0 =C2=A0 =C2=A0 > >
>=C2=A0 =C2=A0 =C2=A0 > > I am pretty sure that what is intended i= s exactly what you say you
>=C2=A0 =C2=A0 =C2=A0 > > support, namely simple propagation of th= e information for the ECN
>=C2=A0 =C2=A0 =C2=A0 > > control loop, not a new loop.
>=C2=A0 =C2=A0 =C2=A0 > >
>=C2=A0 =C2=A0 =C2=A0 > > Can you suggest additional or modified o= wrding for the document
>=C2=A0 =C2=A0 =C2=A0to help
>=C2=A0 =C2=A0 =C2=A0 > > make this clear to readers?
>=C2=A0 =C2=A0 =C2=A0 > >
>=C2=A0 =C2=A0 =C2=A0 > > Thank you,
>=C2=A0 =C2=A0 =C2=A0 > > Joel
>=C2=A0 =C2=A0 =C2=A0 > >
>=C2=A0 =C2=A0 =C2=A0 > > On 1/28/19 4:18 PM, Anoop Ghanwani wrote= :
>=C2=A0 =C2=A0 =C2=A0 > > > I read the draft and had a clarific= ation question about
>=C2=A0 =C2=A0 =C2=A0Section 1.3
>=C2=A0 =C2=A0 =C2=A0 > > > and Section 4.
>=C2=A0 =C2=A0 =C2=A0 > > >
>=C2=A0 =C2=A0 =C2=A0 > > > Is the draft suggestion an alternat= e congestion control mechanism
>=C2=A0 =C2=A0 =C2=A0 > > > between tunnel ingress and tunnel e= gress which is working
>=C2=A0 =C2=A0 =C2=A0separately
>=C2=A0 =C2=A0 =C2=A0 > > > from end-to-end congestion control = that requires ECN?
>=C2=A0 =C2=A0 =C2=A0 > > >
>=C2=A0 =C2=A0 =C2=A0 > > > If it's just about propagation = of bits for the original
>=C2=A0 =C2=A0 =C2=A0feedback loop
>=C2=A0 =C2=A0 =C2=A0 > > > (i.e. before the tunnel header is a= dded), I support the
>=C2=A0 =C2=A0 =C2=A0draft.=C2=A0 If
>=C2=A0 =C2=A0 =C2=A0 > > > it's attempting to define a new= congestion feedback loop and
>=C2=A0 =C2=A0 =C2=A0 > > > mechanism, I think it may need more= discussion.
>=C2=A0 =C2=A0 =C2=A0 > > >
>=C2=A0 =C2=A0 =C2=A0 > > > Thanks,
>=C2=A0 =C2=A0 =C2=A0 > > > Anoop
>=C2=A0 =C2=A0 =C2=A0 > > >
>=C2=A0 =C2=A0 =C2=A0 > > > On Wed, Jan 23, 2019 at 3:14 PM Joe= l M. Halpern
>=C2=A0 =C2=A0 =C2=A0<jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>> wrote:
>=C2=A0 =C2=A0 =C2=A0 > > >>
>=C2=A0 =C2=A0 =C2=A0 > > >> While the time for the call has= completed, I would like to
>=C2=A0 =C2=A0 =C2=A0see the
>=C2=A0 =C2=A0 =C2=A0 > > >> current discussion resolve befo= re judging the adoption as
>=C2=A0 =C2=A0 =C2=A0chair (with Jim).
>=C2=A0 =C2=A0 =C2=A0 > > >> As a corollary, if anyone who h= as not spoken up has an
>=C2=A0 =C2=A0 =C2=A0opinion about the
>=C2=A0 =C2=A0 =C2=A0 > > >> adoption, it is still VERY help= ful if you speak up.=C2=A0 Please
>=C2=A0 =C2=A0 =C2=A0provide
>=C2=A0 =C2=A0 =C2=A0 > > >> motivation for your response. >=C2=A0 =C2=A0 =C2=A0 > > >>
>=C2=A0 =C2=A0 =C2=A0 > > >> If things do not resolve clearl= y on their own, the chairs
>=C2=A0 =C2=A0 =C2=A0will (as is
>=C2=A0 =C2=A0 =C2=A0 > > >> required) reach a determination= anyway, but WG clarity is
>=C2=A0 =C2=A0 =C2=A0preferred.
>=C2=A0 =C2=A0 =C2=A0 > > >>
>=C2=A0 =C2=A0 =C2=A0 > > >> Thank you,
>=C2=A0 =C2=A0 =C2=A0 > > >> Joel
>=C2=A0 =C2=A0 =C2=A0 > > >>
>=C2=A0 =C2=A0 =C2=A0 > > >> _______________________________= ________________
>=C2=A0 =C2=A0 =C2=A0 > > >> sfc mailing list
>=C2=A0 =C2=A0 =C2=A0 > > >> sfc@ietf.org <mailto:sfc@ietf.org>
>=C2=A0 =C2=A0 =C2=A0 > > >> https://www.iet= f.org/mailman/listinfo/sfc
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > _____________________________________________= __
>=C2=A0 =C2=A0 =C2=A0 > sfc mailing list
>=C2=A0 =C2=A0 =C2=A0 > sfc@ietf.org <mailto:sfc@ietf.org>
>=C2=A0 =C2=A0 =C2=A0 > https://www.ietf.org/mailman/= listinfo/sfc
>
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
>
--000000000000fe738d058151c187-- From nobody Thu Feb 7 11:20:35 2019 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 8F60512D84C for ; Thu, 7 Feb 2019 11:20:33 -0800 (PST) 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 UrGRaD4O7gX6 for ; Thu, 7 Feb 2019 11:20:31 -0800 (PST) Received: from maila2.tigertech.net (maila2.tigertech.net [208.80.4.152]) (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 75B8012D4E8 for ; Thu, 7 Feb 2019 11:20:31 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by maila2.tigertech.net (Postfix) with ESMTP id 43wSnq26tqzRlS6; Thu, 7 Feb 2019 11:20:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=2.tigertech; t=1549567231; bh=kwqB0SkJzGOE6jeyWxQF9F5JOn0FIbxxLM+KtKOvGKw=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=V3LMA5NbpTmx9ltRrympWmxhoO6KEesdWVaUQPe/FuMN9bCCrfpIibdrcq03zhoI5 Zv0cnCBEcHKPm8N07gqNEYxkxvu86tx9FZh+YRHa+Z4ofS1fMQsKKdFxEwhKR8/VXw k8G+s0D/wDdLrqCPD/1s0LzxxPIYN+/XdhCRyk+M= X-Virus-Scanned: Debian amavisd-new at maila2.tigertech.net Received: from Joels-MacBook-Pro.local (209-255-163-147.ip.mcleodusa.net [209.255.163.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 43wSnp1YpRzRhnV; Thu, 7 Feb 2019 11:20:30 -0800 (PST) To: Anoop Ghanwani Cc: Donald Eastlake , "sfc@ietf.org" References: <2a7e8ef0-4528-663e-89f6-51a0ea729013@joelhalpern.com> From: "Joel M. Halpern" Message-ID: <98ac5f00-caaf-7df5-e68f-51500e4b6cdc@joelhalpern.com> Date: Thu, 7 Feb 2019 14:20:29 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.5.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [sfc] Regarding draft-eastlake-sfc-nsh-ecn-support adoption call X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Feb 2019 19:20:33 -0000 I had not understood that you meant specifically the tunnel congestion feedback. I see that there is already a normative reference to https://tools.ietf.org/html/draft-ietf-tsvwg-tunnel-congestion-feedback-06 While that normative reference may create problems for completing the work, I do not see it as a problem for the working group adopting the document? If TSVWG ends up not advancing that document, then presumably the corresponding sections o fthis document would be removed? Yours, Joel On 2/7/19 1:10 PM, Anoop Ghanwani wrote: > Hi Joel, > > I'm specifically referring to how the tunnel ingress should react to > congestion reports in terms of traffic engineering (selecting one tunnel > over another), which is the part that Donald is trying to retain in the > draft. > > Is that what you're referring to?  If so, can you point to a specific > section in RFC 6040?  I took a quick look and I'm not able to find > anything about that.  All I see there is about propagation of ECN bits. > > Thanks, > Anoop > > On Thu, Feb 7, 2019 at 9:17 AM Joel M. Halpern > wrote: > > Isn't a lot of that general discussion already captured in RFC 6040? > > Yours, > Joel > > On 2/7/19 11:54 AM, Anoop Ghanwani wrote: > > Hi Donald, > > > > The functions are useful.  I just think they need more discussion > before > > it can be put in a WG document.  What is being suggested would be > useful > > for any tunneling technology, not just SFC.  And that's why it would > > need wider discussion as to what information should be fed to the > tunnel > > ingress. > > > > A couple of issues for example: > > - How does one treat ECT vs non-ECT sessions when making these > decisions? > > - How do we know the feedback is accurate if there are no ECT > sessions? > > > > The document becomes a lot more straightforward if all it is dealing > > with is propagation of ECN bits from inner to outer header and > vice versa. > > > > Thanks, > > Anoop > > > > On Tue, Feb 5, 2019 at 10:08 PM Donald Eastlake > > >> wrote: > > > >     Hi Anoop, > > > >     I'm willing to consider removing a lot of this but I don't > understand > >     what's wrong with Section 1.3, item (3). Say you are a > provider of SFC > >     services to many clients and client session are relatively > long lived > >     and the services required by a client session can be provided > through > >     any one of multiple SFF paths. When a new client session starts, > >     wouldn't the classified want to have congestion information > about the > >     SFF paths in use by existing client sessions when choosing > the SFF > >     path to be used by the new session? > > > >     Thanks, > >     Donald > >     =============================== > >       Donald E. Eastlake 3rd   +1-508-333-2270 (cell) > >       1424 Pro Shop Court, Davenport, FL 33896 USA > > d3e3e3@gmail.com > > > > > >     On Mon, Jan 28, 2019 at 4:23 PM Anoop Ghanwani > >      > >> wrote: > >      > > >      > Hi Joel, > >      > > >      > If that is truly the case, then I think Sections 1.3 and 4 > should > >     be removed. > >      > > >      > Otherwise, I myself am not clear what 1.3 and 4 are trying to > >      > accomplish and therefore would need clarification on that > from the > >      > authors. > >      > > >      > Thanks, > >      > Anoop > >      > > >      > On Mon, Jan 28, 2019 at 1:20 PM Joel Halpern Direct > >      > > >> > >     wrote: > >      > > > >      > > I am pretty sure that what is intended is exactly what > you say you > >      > > support, namely simple propagation of the information > for the ECN > >      > > control loop, not a new loop. > >      > > > >      > > Can you suggest additional or modified owrding for the > document > >     to help > >      > > make this clear to readers? > >      > > > >      > > Thank you, > >      > > Joel > >      > > > >      > > On 1/28/19 4:18 PM, Anoop Ghanwani wrote: > >      > > > I read the draft and had a clarification question about > >     Section 1.3 > >      > > > and Section 4. > >      > > > > >      > > > Is the draft suggestion an alternate congestion > control mechanism > >      > > > between tunnel ingress and tunnel egress which is working > >     separately > >      > > > from end-to-end congestion control that requires ECN? > >      > > > > >      > > > If it's just about propagation of bits for the original > >     feedback loop > >      > > > (i.e. before the tunnel header is added), I support the > >     draft.  If > >      > > > it's attempting to define a new congestion feedback > loop and > >      > > > mechanism, I think it may need more discussion. > >      > > > > >      > > > Thanks, > >      > > > Anoop > >      > > > > >      > > > On Wed, Jan 23, 2019 at 3:14 PM Joel M. Halpern > >      > >> wrote: > >      > > >> > >      > > >> While the time for the call has completed, I would > like to > >     see the > >      > > >> current discussion resolve before judging the adoption as > >     chair (with Jim). > >      > > >> As a corollary, if anyone who has not spoken up has an > >     opinion about the > >      > > >> adoption, it is still VERY helpful if you speak up. > Please > >     provide > >      > > >> motivation for your response. > >      > > >> > >      > > >> If things do not resolve clearly on their own, the chairs > >     will (as is > >      > > >> required) reach a determination anyway, but WG clarity is > >     preferred. > >      > > >> > >      > > >> Thank you, > >      > > >> Joel > >      > > >> > >      > > >> _______________________________________________ > >      > > >> sfc mailing list > >      > > >> sfc@ietf.org > > > >      > > >> https://www.ietf.org/mailman/listinfo/sfc > >      > > >      > _______________________________________________ > >      > sfc mailing list > >      > sfc@ietf.org > > >      > https://www.ietf.org/mailman/listinfo/sfc > > > > > > _______________________________________________ > > sfc mailing list > > sfc@ietf.org > > https://www.ietf.org/mailman/listinfo/sfc > > > From nobody Thu Feb 7 15:03:57 2019 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 441D5130EC0 for ; Thu, 7 Feb 2019 15:03:56 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.88 X-Spam-Level: X-Spam-Status: No, score=-1.88 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.018, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, 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 zWjGVnisL9HC for ; Thu, 7 Feb 2019 15:03:52 -0800 (PST) Received: from mail-vs1-f54.google.com (mail-vs1-f54.google.com [209.85.217.54]) (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 761F4130E62 for ; Thu, 7 Feb 2019 15:03:52 -0800 (PST) Received: by mail-vs1-f54.google.com with SMTP id t13so1042895vsk.3 for ; Thu, 07 Feb 2019 15:03:52 -0800 (PST) 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=7pkYeiEoJuv1cg1aP9N2151TXqqguc58joQ7ndv+FDA=; b=kYXGJG/E9Ed2YoCSeyfiDLudqwGVrIKbwv3nv0GUcDLNL/x5hCbfzEDfgwLFHNL4/B KznmeFbrc2zplvgIb3gwhfbr0QmAEHf35Iidfzdz+n+nHfDsMz37Fe1ACjcflb/H6VPt VV+Eeq/Hb+xB6NCAwFpsaVds+py2YkB24Wm23euvfGAKdK2BJ1MLVfXX8Dd5MFBcmau0 2Cbh9Umviiob1GmhEV58muvlQGmC9KYDIpQy6NK2NedfRWUuZoKbjC4ffNgWeo2j4RbO QKnRRXmHD6T40ePQWrpg76HKrLXY9dChzBLgmcnTXUdhSe1ckp80jyz9oPpdoA6cMqsq k24Q== X-Gm-Message-State: AHQUAuYJn/4o/B3Dv9lOlH16vMuD/D3kHPNDD8tD8gt+7sUkuWCpOVLp K37jqzQCQJiPpFvG++tPxXRFelo85B0vznwl0P8= X-Google-Smtp-Source: AHgI3IZZDQLSrS5KDBGxGcHH2YYslab1aZ5YJS4L2NrlcW99AmEzy/b4ntHOrScfDXJz9bpAoXruyHt7djcPu7hzviU= X-Received: by 2002:a67:741:: with SMTP id 62mr7445137vsh.228.1549580631041; Thu, 07 Feb 2019 15:03:51 -0800 (PST) MIME-Version: 1.0 References: <2a7e8ef0-4528-663e-89f6-51a0ea729013@joelhalpern.com> <98ac5f00-caaf-7df5-e68f-51500e4b6cdc@joelhalpern.com> In-Reply-To: <98ac5f00-caaf-7df5-e68f-51500e4b6cdc@joelhalpern.com> From: Anoop Ghanwani Date: Thu, 7 Feb 2019 15:03:39 -0800 Message-ID: To: "Joel M. Halpern" Cc: Donald Eastlake , "sfc@ietf.org" Content-Type: multipart/alternative; boundary="000000000000106f5e058155db0d" Archived-At: Subject: Re: [sfc] Regarding draft-eastlake-sfc-nsh-ecn-support adoption call X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Feb 2019 23:03:56 -0000 --000000000000106f5e058155db0d Content-Type: text/plain; charset="UTF-8" Hi Joel, OK, I can see a case for leaving it in. Thanks, Anoop On Thu, Feb 7, 2019 at 11:20 AM Joel M. Halpern wrote: > I had not understood that you meant specifically the tunnel congestion > feedback. I see that there is already a normative reference to > https://tools.ietf.org/html/draft-ietf-tsvwg-tunnel-congestion-feedback-06 > > While that normative reference may create problems for completing the > work, I do not see it as a problem for the working group adopting the > document? If TSVWG ends up not advancing that document, then presumably > the corresponding sections o fthis document would be removed? > > Yours, > Joel > > On 2/7/19 1:10 PM, Anoop Ghanwani wrote: > > Hi Joel, > > > > I'm specifically referring to how the tunnel ingress should react to > > congestion reports in terms of traffic engineering (selecting one tunnel > > over another), which is the part that Donald is trying to retain in the > > draft. > > > > Is that what you're referring to? If so, can you point to a specific > > section in RFC 6040? I took a quick look and I'm not able to find > > anything about that. All I see there is about propagation of ECN bits. > > > > Thanks, > > Anoop > > > > On Thu, Feb 7, 2019 at 9:17 AM Joel M. Halpern > > wrote: > > > > Isn't a lot of that general discussion already captured in RFC 6040? > > > > Yours, > > Joel > > > > On 2/7/19 11:54 AM, Anoop Ghanwani wrote: > > > Hi Donald, > > > > > > The functions are useful. I just think they need more discussion > > before > > > it can be put in a WG document. What is being suggested would be > > useful > > > for any tunneling technology, not just SFC. And that's why it > would > > > need wider discussion as to what information should be fed to the > > tunnel > > > ingress. > > > > > > A couple of issues for example: > > > - How does one treat ECT vs non-ECT sessions when making these > > decisions? > > > - How do we know the feedback is accurate if there are no ECT > > sessions? > > > > > > The document becomes a lot more straightforward if all it is > dealing > > > with is propagation of ECN bits from inner to outer header and > > vice versa. > > > > > > Thanks, > > > Anoop > > > > > > On Tue, Feb 5, 2019 at 10:08 PM Donald Eastlake > > > > >> wrote: > > > > > > Hi Anoop, > > > > > > I'm willing to consider removing a lot of this but I don't > > understand > > > what's wrong with Section 1.3, item (3). Say you are a > > provider of SFC > > > services to many clients and client session are relatively > > long lived > > > and the services required by a client session can be provided > > through > > > any one of multiple SFF paths. When a new client session > starts, > > > wouldn't the classified want to have congestion information > > about the > > > SFF paths in use by existing client sessions when choosing > > the SFF > > > path to be used by the new session? > > > > > > Thanks, > > > Donald > > > =============================== > > > Donald E. Eastlake 3rd +1-508-333-2270 (cell) > > > 1424 Pro Shop Court, Davenport, FL 33896 USA > > > d3e3e3@gmail.com > > > > > > > > > On Mon, Jan 28, 2019 at 4:23 PM Anoop Ghanwani > > > > > >> > wrote: > > > > > > > > Hi Joel, > > > > > > > > If that is truly the case, then I think Sections 1.3 and 4 > > should > > > be removed. > > > > > > > > Otherwise, I myself am not clear what 1.3 and 4 are trying > to > > > > accomplish and therefore would need clarification on that > > from the > > > > authors. > > > > > > > > Thanks, > > > > Anoop > > > > > > > > On Mon, Jan 28, 2019 at 1:20 PM Joel Halpern Direct > > > > > > > jmh.direct@joelhalpern.com>>> > > > wrote: > > > > > > > > > > I am pretty sure that what is intended is exactly what > > you say you > > > > > support, namely simple propagation of the information > > for the ECN > > > > > control loop, not a new loop. > > > > > > > > > > Can you suggest additional or modified owrding for the > > document > > > to help > > > > > make this clear to readers? > > > > > > > > > > Thank you, > > > > > Joel > > > > > > > > > > On 1/28/19 4:18 PM, Anoop Ghanwani wrote: > > > > > > I read the draft and had a clarification question about > > > Section 1.3 > > > > > > and Section 4. > > > > > > > > > > > > Is the draft suggestion an alternate congestion > > control mechanism > > > > > > between tunnel ingress and tunnel egress which is > working > > > separately > > > > > > from end-to-end congestion control that requires ECN? > > > > > > > > > > > > If it's just about propagation of bits for the original > > > feedback loop > > > > > > (i.e. before the tunnel header is added), I support the > > > draft. If > > > > > > it's attempting to define a new congestion feedback > > loop and > > > > > > mechanism, I think it may need more discussion. > > > > > > > > > > > > Thanks, > > > > > > Anoop > > > > > > > > > > > > On Wed, Jan 23, 2019 at 3:14 PM Joel M. Halpern > > > > > >> wrote: > > > > > >> > > > > > >> While the time for the call has completed, I would > > like to > > > see the > > > > > >> current discussion resolve before judging the > adoption as > > > chair (with Jim). > > > > > >> As a corollary, if anyone who has not spoken up has an > > > opinion about the > > > > > >> adoption, it is still VERY helpful if you speak up. > > Please > > > provide > > > > > >> motivation for your response. > > > > > >> > > > > > >> If things do not resolve clearly on their own, the > chairs > > > will (as is > > > > > >> required) reach a determination anyway, but WG > clarity is > > > preferred. > > > > > >> > > > > > >> Thank you, > > > > > >> Joel > > > > > >> > > > > > >> _______________________________________________ > > > > > >> sfc mailing list > > > > > >> sfc@ietf.org > > > > > > > > >> https://www.ietf.org/mailman/listinfo/sfc > > > > > > > > _______________________________________________ > > > > sfc mailing list > > > > sfc@ietf.org > > > > > > https://www.ietf.org/mailman/listinfo/sfc > > > > > > > > > _______________________________________________ > > > sfc mailing list > > > sfc@ietf.org > > > https://www.ietf.org/mailman/listinfo/sfc > > > > > > --000000000000106f5e058155db0d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Joel,

OK, I can see= a case for leaving it in.

Thanks,
Anoop=

On Thu, Feb 7, 2019 at 11:20 AM Joel M. Halpern <jmh@joelhalpern.com> wrote:
I had not understood that you mean= t specifically the tunnel congestion
feedback.=C2=A0 I see that there is already a normative reference to
https://tools.ietf.org/htm= l/draft-ietf-tsvwg-tunnel-congestion-feedback-06

While that normative reference may create problems for completing the
work, I do not see it as a problem for the working group adopting the
document?=C2=A0 If TSVWG ends up not advancing that document, then presumab= ly
the corresponding sections o fthis document would be removed?

Yours,
Joel

On 2/7/19 1:10 PM, Anoop Ghanwani wrote:
> Hi Joel,
>
> I'm specifically referring to how the tunnel ingress should react = to
> congestion reports in terms of traffic engineering (selecting one tunn= el
> over another), which is the part that Donald is trying to retain in th= e
> draft.
>
> Is that what you're referring to?=C2=A0 If so, can you point to a = specific
> section in RFC 6040?=C2=A0 I took a quick look and I'm not able to= find
> anything about that.=C2=A0 All I see there is about propagation of ECN= bits.
>
> Thanks,
> Anoop
>
> On Thu, Feb 7, 2019 at 9:17 AM Joel M. Halpern <jmh@joelhalpern.com
> <mailto:jm= h@joelhalpern.com>> wrote:
>
>=C2=A0 =C2=A0 =C2=A0Isn't a lot of that general discussion already = captured in RFC 6040?
>
>=C2=A0 =C2=A0 =C2=A0Yours,
>=C2=A0 =C2=A0 =C2=A0Joel
>
>=C2=A0 =C2=A0 =C2=A0On 2/7/19 11:54 AM, Anoop Ghanwani wrote:
>=C2=A0 =C2=A0 =C2=A0 > Hi Donald,
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > The functions are useful.=C2=A0 I just think = they need more discussion
>=C2=A0 =C2=A0 =C2=A0before
>=C2=A0 =C2=A0 =C2=A0 > it can be put in a WG document.=C2=A0 What is= being suggested would be
>=C2=A0 =C2=A0 =C2=A0useful
>=C2=A0 =C2=A0 =C2=A0 > for any tunneling technology, not just SFC.= =C2=A0 And that's why it would
>=C2=A0 =C2=A0 =C2=A0 > need wider discussion as to what information = should be fed to the
>=C2=A0 =C2=A0 =C2=A0tunnel
>=C2=A0 =C2=A0 =C2=A0 > ingress.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > A couple of issues for example:
>=C2=A0 =C2=A0 =C2=A0 > - How does one treat ECT vs non-ECT sessions = when making these
>=C2=A0 =C2=A0 =C2=A0decisions?
>=C2=A0 =C2=A0 =C2=A0 > - How do we know the feedback is accurate if = there are no ECT
>=C2=A0 =C2=A0 =C2=A0sessions?
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > The document becomes a lot more straightforwa= rd if all it is dealing
>=C2=A0 =C2=A0 =C2=A0 > with is propagation of ECN bits from inner to= outer header and
>=C2=A0 =C2=A0 =C2=A0vice versa.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Thanks,
>=C2=A0 =C2=A0 =C2=A0 > Anoop
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > On Tue, Feb 5, 2019 at 10:08 PM Donald Eastla= ke <d3e3e3@gmail.c= om
>=C2=A0 =C2=A0 =C2=A0<mailto:d3e3e3@gmail.com>
>=C2=A0 =C2=A0 =C2=A0 > <mailto:d3e3e3@gmail.com <mailto:d3e3e3@gmail.com>>> wrote:
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Hi Anoop,
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0I'm willing to conside= r removing a lot of this but I don't
>=C2=A0 =C2=A0 =C2=A0understand
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0what's wrong with Sect= ion 1.3, item (3). Say you are a
>=C2=A0 =C2=A0 =C2=A0provider of SFC
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0services to many clients a= nd client session are relatively
>=C2=A0 =C2=A0 =C2=A0long lived
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0and the services required = by a client session can be provided
>=C2=A0 =C2=A0 =C2=A0through
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0any one of multiple SFF pa= ths. When a new client session starts,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0wouldn't the classifie= d want to have congestion information
>=C2=A0 =C2=A0 =C2=A0about the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0SFF paths in use by existi= ng client sessions when choosing
>=C2=A0 =C2=A0 =C2=A0the SFF
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0path to be used by the new= session?
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Thanks,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Donald
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0Donald E. Eastlake = 3rd=C2=A0 =C2=A0+1-508-333-2270 (cell)
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A01424 Pro Shop Court= , Davenport, FL 33896 USA
>=C2=A0 =C2=A0 =C2=A0 > d3e3e3@gmail.com <mailto:d3e3e3@gmail.com>
>=C2=A0 =C2=A0 =C2=A0<mailto:d3e3e3@gmail.com <mailto:d3e3e3@gmail.com>>
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0On Mon, Jan 28, 2019 at 4:= 23 PM Anoop Ghanwani
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<anoop@alumni.duke.edu <mailto:<= a href=3D"mailto:anoop@alumni.duke.edu" target=3D"_blank">anoop@alumni.duke= .edu>
>=C2=A0 =C2=A0 =C2=A0<mailto:anoop@alumni.duke.edu <mailto:anoop@alumni.duke.edu>>&g= t; 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 > Hi Joel,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > If that is truly the= case, then I think Sections 1.3 and 4
>=C2=A0 =C2=A0 =C2=A0should
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0be removed.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Otherwise, I myself = am not clear what 1.3 and 4 are trying to
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > accomplish and there= fore would need clarification on that
>=C2=A0 =C2=A0 =C2=A0from the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > 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 > Thanks,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Anoop
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > On Mon, Jan 28, 2019= at 1:20 PM Joel Halpern Direct
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > <jmh.direct@joelhalpern.com<= /a>
>=C2=A0 =C2=A0 =C2=A0<mailto:jmh.direct@joelhalpern.com>
>=C2=A0 =C2=A0 =C2=A0<mailto:jmh.direct@joelhalpern.com <mailto:jmh.direct@joelhal= pern.com>>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0wrote:
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > I am pretty sur= e that what is intended is exactly what
>=C2=A0 =C2=A0 =C2=A0you say you
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > support, namely= simple propagation of the information
>=C2=A0 =C2=A0 =C2=A0for the ECN
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > control loop, n= ot a new loop.
>=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 you suggest= additional or modified owrding for the
>=C2=A0 =C2=A0 =C2=A0document
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0to help
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > make this clear= to readers?
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > Thank you,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > Joel
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > On 1/28/19 4:18= PM, Anoop Ghanwani wrote:
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > > I read the= draft and had a clarification question about
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Section 1.3
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > > and Sectio= n 4.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > > Is the dra= ft suggestion an alternate congestion
>=C2=A0 =C2=A0 =C2=A0control mechanism
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > > between tu= nnel ingress and tunnel egress which is working
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0separately
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > > from end-t= o-end congestion control that requires ECN?
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > > If it'= s just about propagation of bits for the original
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0feedback loop
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > > (i.e. befo= re the tunnel header is added), I support the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0draft.=C2=A0 If
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > > it's a= ttempting to define a new congestion feedback
>=C2=A0 =C2=A0 =C2=A0loop and
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > > mechanism,= I think it may need more discussion.
>=C2=A0 =C2=A0 =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 > > > Anoop
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > > On Wed, Ja= n 23, 2019 at 3:14 PM Joel M. Halpern
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<jmh@joelhalpern.com <mailto:jmh@joelhalpern.com= >
>=C2=A0 =C2=A0 =C2=A0<mailto:jmh@joelhalpern.com <mailto:jmh@joelhalpern.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 > > >> While = the time for the call has completed, I would
>=C2=A0 =C2=A0 =C2=A0like to
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0see the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > >> curren= t discussion resolve before judging the adoption as
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0chair (with Jim).
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > >> As a c= orollary, if anyone who has not spoken up has an
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0opinion about the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > >> adopti= on, it is still VERY helpful if you speak up.
>=C2=A0 =C2=A0 =C2=A0Please
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0provide
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > >> motiva= tion for your response.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > >>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > >> If thi= ngs do not resolve clearly on their own, the chairs
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0will (as is
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > >> requir= ed) reach a determination anyway, but WG clarity is
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0preferred.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > >>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > >> Thank = you,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > >> Joel >=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 > > >> sfc ma= iling list
>=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<mailto:sfc@ietf.org <mailto:sfc@ietf.org>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > > >> https://www.ietf.org/mailman/listinfo/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=A0 >=C2=A0 =C2=A0 =C2=A0 > sfc mailing list
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > sfc@ietf.org <mailto:sfc@ietf.org> <mailto:sfc@ietf.org
>=C2=A0 =C2=A0 =C2=A0<mailto:sfc@ietf.org>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > http= s://www.ietf.org/mailman/listinfo/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 > sfc mailing list
>=C2=A0 =C2=A0 =C2=A0 > sfc@ietf.org <mailto:sfc@ietf.org>
>=C2=A0 =C2=A0 =C2=A0 > https://www.ietf.org/mailman/= listinfo/sfc
>=C2=A0 =C2=A0 =C2=A0 >
>
--000000000000106f5e058155db0d-- From nobody Thu Feb 7 16:04:24 2019 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 CDDF8130F15 for ; Thu, 7 Feb 2019 16:04:22 -0800 (PST) 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 eThxJoFuuRVh for ; Thu, 7 Feb 2019 16:04:20 -0800 (PST) Received: from maila2.tigertech.net (maila2.tigertech.net [208.80.4.152]) (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 3E8E5130ED0 for ; Thu, 7 Feb 2019 16:04:20 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by maila2.tigertech.net (Postfix) with ESMTP id 43wb5J0z2mzRly5; Thu, 7 Feb 2019 16:04:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=2.tigertech; t=1549584260; bh=Y2HCv9t7qPeTRidKjhcWiizj/Ij3Pl+cZvAMEVhJn9A=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=NjEelzvRcOqkvPjevzjE0FkRn2yUM0d6VSz8GfRHlk/5bhmmSqiRwdJvL/8DUX2HT vEKmm2vVUjCHOLq0e+RuK40Gt0KZLDqf2t1guO9yJKumnLToCY/zoEm+SuH9ZYVSPC ttEGLh6L7O5KYG/JIw4FDggupe66f2cf8E0TyR94= X-Virus-Scanned: Debian amavisd-new at maila2.tigertech.net Received: from Joels-MacBook-Pro.local (209-255-163-147.ip.mcleodusa.net [209.255.163.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 43wb5H1ggtzRly2; Thu, 7 Feb 2019 16:04:19 -0800 (PST) To: Anoop Ghanwani Cc: Donald Eastlake , "sfc@ietf.org" References: <2a7e8ef0-4528-663e-89f6-51a0ea729013@joelhalpern.com> <98ac5f00-caaf-7df5-e68f-51500e4b6cdc@joelhalpern.com> From: "Joel M. Halpern" Message-ID: <819435d4-b8e8-cca6-f876-43c39e99deba@joelhalpern.com> Date: Thu, 7 Feb 2019 19:04:17 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.5.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [sfc] Regarding draft-eastlake-sfc-nsh-ecn-support adoption call X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 08 Feb 2019 00:04:23 -0000 Okay. With that, as chair I conclude that the working group has adopted this document. Authors, please resubmit as draft-ietf-sfc-nsh-ecn-support. Yours, Joel On 2/7/19 6:03 PM, Anoop Ghanwani wrote: > Hi Joel, > > OK, I can see a case for leaving it in. > > Thanks, > Anoop > > On Thu, Feb 7, 2019 at 11:20 AM Joel M. Halpern > wrote: > > I had not understood that you meant specifically the tunnel congestion > feedback.  I see that there is already a normative reference to > https://tools.ietf.org/html/draft-ietf-tsvwg-tunnel-congestion-feedback-06 > > While that normative reference may create problems for completing the > work, I do not see it as a problem for the working group adopting the > document?  If TSVWG ends up not advancing that document, then > presumably > the corresponding sections o fthis document would be removed? > > Yours, > Joel > > On 2/7/19 1:10 PM, Anoop Ghanwani wrote: > > Hi Joel, > > > > I'm specifically referring to how the tunnel ingress should react to > > congestion reports in terms of traffic engineering (selecting one > tunnel > > over another), which is the part that Donald is trying to retain > in the > > draft. > > > > Is that what you're referring to?  If so, can you point to a > specific > > section in RFC 6040?  I took a quick look and I'm not able to find > > anything about that.  All I see there is about propagation of ECN > bits. > > > > Thanks, > > Anoop > > > > On Thu, Feb 7, 2019 at 9:17 AM Joel M. Halpern > > > >> wrote: > > > >     Isn't a lot of that general discussion already captured in > RFC 6040? > > > >     Yours, > >     Joel > > > >     On 2/7/19 11:54 AM, Anoop Ghanwani wrote: > >      > Hi Donald, > >      > > >      > The functions are useful.  I just think they need more > discussion > >     before > >      > it can be put in a WG document.  What is being suggested > would be > >     useful > >      > for any tunneling technology, not just SFC.  And that's > why it would > >      > need wider discussion as to what information should be fed > to the > >     tunnel > >      > ingress. > >      > > >      > A couple of issues for example: > >      > - How does one treat ECT vs non-ECT sessions when making these > >     decisions? > >      > - How do we know the feedback is accurate if there are no ECT > >     sessions? > >      > > >      > The document becomes a lot more straightforward if all it > is dealing > >      > with is propagation of ECN bits from inner to outer header and > >     vice versa. > >      > > >      > Thanks, > >      > Anoop > >      > > >      > On Tue, Feb 5, 2019 at 10:08 PM Donald Eastlake > > >     > > >      > > >>> wrote: > >      > > >      >     Hi Anoop, > >      > > >      >     I'm willing to consider removing a lot of this but I don't > >     understand > >      >     what's wrong with Section 1.3, item (3). Say you are a > >     provider of SFC > >      >     services to many clients and client session are relatively > >     long lived > >      >     and the services required by a client session can be > provided > >     through > >      >     any one of multiple SFF paths. When a new client > session starts, > >      >     wouldn't the classified want to have congestion > information > >     about the > >      >     SFF paths in use by existing client sessions when choosing > >     the SFF > >      >     path to be used by the new session? > >      > > >      >     Thanks, > >      >     Donald > >      >     =============================== > >      >       Donald E. Eastlake 3rd   +1-508-333-2270 (cell) > >      >       1424 Pro Shop Court, Davenport, FL 33896 USA > >      > d3e3e3@gmail.com > > > >      > >> > >      > > >      >     On Mon, Jan 28, 2019 at 4:23 PM Anoop Ghanwani > >      >      > > > >      > >>> wrote: > >      >      > > >      >      > Hi Joel, > >      >      > > >      >      > If that is truly the case, then I think Sections > 1.3 and 4 > >     should > >      >     be removed. > >      >      > > >      >      > Otherwise, I myself am not clear what 1.3 and 4 are > trying to > >      >      > accomplish and therefore would need clarification > on that > >     from the > >      >      > authors. > >      >      > > >      >      > Thanks, > >      >      > Anoop > >      >      > > >      >      > On Mon, Jan 28, 2019 at 1:20 PM Joel Halpern Direct > >      >      > > >      > > >      > >>> > >      >     wrote: > >      >      > > > >      >      > > I am pretty sure that what is intended is exactly > what > >     you say you > >      >      > > support, namely simple propagation of the information > >     for the ECN > >      >      > > control loop, not a new loop. > >      >      > > > >      >      > > Can you suggest additional or modified owrding > for the > >     document > >      >     to help > >      >      > > make this clear to readers? > >      >      > > > >      >      > > Thank you, > >      >      > > Joel > >      >      > > > >      >      > > On 1/28/19 4:18 PM, Anoop Ghanwani wrote: > >      >      > > > I read the draft and had a clarification > question about > >      >     Section 1.3 > >      >      > > > and Section 4. > >      >      > > > > >      >      > > > Is the draft suggestion an alternate congestion > >     control mechanism > >      >      > > > between tunnel ingress and tunnel egress which > is working > >      >     separately > >      >      > > > from end-to-end congestion control that > requires ECN? > >      >      > > > > >      >      > > > If it's just about propagation of bits for the > original > >      >     feedback loop > >      >      > > > (i.e. before the tunnel header is added), I > support the > >      >     draft.  If > >      >      > > > it's attempting to define a new congestion feedback > >     loop and > >      >      > > > mechanism, I think it may need more discussion. > >      >      > > > > >      >      > > > Thanks, > >      >      > > > Anoop > >      >      > > > > >      >      > > > On Wed, Jan 23, 2019 at 3:14 PM Joel M. Halpern > >      >      > > > >      > >>> wrote: > >      >      > > >> > >      >      > > >> While the time for the call has completed, I would > >     like to > >      >     see the > >      >      > > >> current discussion resolve before judging the > adoption as > >      >     chair (with Jim). > >      >      > > >> As a corollary, if anyone who has not spoken > up has an > >      >     opinion about the > >      >      > > >> adoption, it is still VERY helpful if you > speak up. > >     Please > >      >     provide > >      >      > > >> motivation for your response. > >      >      > > >> > >      >      > > >> If things do not resolve clearly on their own, > the chairs > >      >     will (as is > >      >      > > >> required) reach a determination anyway, but WG > clarity is > >      >     preferred. > >      >      > > >> > >      >      > > >> Thank you, > >      >      > > >> Joel > >      >      > > >> > >      >      > > >> _______________________________________________ > >      >      > > >> sfc mailing list > >      >      > > >> sfc@ietf.org > > > >      > >> > >      >      > > >> https://www.ietf.org/mailman/listinfo/sfc > >      >      > > >      >      > _______________________________________________ > >      >      > sfc mailing list > >      >      > sfc@ietf.org > > > >     >> > >      >      > https://www.ietf.org/mailman/listinfo/sfc > >      > > >      > > >      > _______________________________________________ > >      > sfc mailing list > >      > sfc@ietf.org > > >      > https://www.ietf.org/mailman/listinfo/sfc > >      > > > > From nobody Fri Feb 8 05:46:43 2019 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 D0DCE130E69; Fri, 8 Feb 2019 05:46:40 -0800 (PST) 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: 6.91.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: sfc@ietf.org Message-ID: <154963360079.31239.10669381331517071342@ietfa.amsl.com> Date: Fri, 08 Feb 2019 05:46:40 -0800 Archived-At: Subject: [sfc] I-D Action: draft-ietf-sfc-nsh-ecn-support-00.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 08 Feb 2019 13:46:41 -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 : Explicit Congestion Notification (ECN) and Congestion Feedback Using the Network Service Header (NSH) Authors : Donald E. Eastlake Bob Briscoe Andrew G. Malis Filename : draft-ietf-sfc-nsh-ecn-support-00.txt Pages : 21 Date : 2019-02-07 Abstract: Explicit congestion notification (ECN) allows a forwarding element to notify downstream devices of the onset of congestion without having to drop packets. Coupled with a means to feed back information about congestion to upstream nodes, this can improve network efficiency through better congestion control, frequently without packet drops. This document specifies ECN and congestion feedback support within a Service Function Chaining (SFC) domain through use of the Network Service Header (NSH, RFC 8300) and IP Flow Information Export (IPFIX, draft-ietf-tsvwg-tunnel-congestion-feedback). The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-sfc-nsh-ecn-support/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-sfc-nsh-ecn-support-00 https://datatracker.ietf.org/doc/html/draft-ietf-sfc-nsh-ecn-support-00 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 Fri Feb 8 07:57:44 2019 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 E5A0A126C15; Fri, 8 Feb 2019 07:57:32 -0800 (PST) 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: 6.91.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: sfc@ietf.org Message-ID: <154964145289.31196.13096207160639380756@ietfa.amsl.com> Date: Fri, 08 Feb 2019 07:57:32 -0800 Archived-At: Subject: [sfc] I-D Action: draft-ietf-sfc-serviceid-header-02.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 08 Feb 2019 15:57:33 -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 : Service Function Chaining: Subscriber and Performance Policy Identification Variable-Length Network Service Header (NSH) Context Headers Authors : Behcet Sarikaya Dirk von Hugo Mohamed Boucadair Filename : draft-ietf-sfc-serviceid-header-02.txt Pages : 9 Date : 2019-02-08 Abstract: This document defines Subscriber and Performance Policy Identifiers Network Service Header Variable-Length Context Headers to inform Service Functions about subscriber- and service-related information for the sake of policy enforcement and appropriate service function chaining operations. The structure of each context header is defined, their use and processing instructions by SFC-aware nodes are explained. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-sfc-serviceid-header/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-sfc-serviceid-header-02 https://datatracker.ietf.org/doc/html/draft-ietf-sfc-serviceid-header-02 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-serviceid-header-02 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 Feb 10 22:09:22 2019 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 EE30912894E for ; Sun, 10 Feb 2019 22:09:19 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.197 X-Spam-Level: X-Spam-Status: No, score=-4.197 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_MED=-2.3, 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 f2zgfmLbCBBh for ; Sun, 10 Feb 2019 22:09:16 -0800 (PST) Received: from mxhk.zte.com.cn (mxhk.zte.com.cn [63.217.80.70]) (using TLSv1.2 with cipher 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--=====_001_next=====-- From nobody Tue Feb 12 08:06:04 2019 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 D16E91292F1; Tue, 12 Feb 2019 08:06:00 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IETF Secretariat To: Cc: ipr-announce@ietf.org, sfc@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.91.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <154998756083.8350.13395130928228954930@ietfa.amsl.com> Date: Tue, 12 Feb 2019 08:06:00 -0800 Archived-At: Subject: [sfc] IPR Disclosure Huawei Technologies Co., Ltd's Statement about IPR related to draft-ietf-sfc-nsh-ecn-support X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Feb 2019 16:06:01 -0000 Dear Donald E. Eastlake 3rd, Bob Briscoe, Andrew G. Malis: An IPR disclosure that pertains to your Internet-Draft entitled "Explicit Congestion Notification (ECN) and Congestion Feedback Using the Network Service Header (NSH)" (draft-ietf-sfc-nsh-ecn-support) was submitted to the IETF Secretariat on and has been posted on the "IETF Page of Intellectual Property Rights Disclosures" (https://datatracker.ietf.org/ipr/3424/). The title of the IPR disclosure is "Huawei Technologies Co.,Ltd's Statement about IPR related to draft-ietf-sfc-nsh-ecn-support" Thank you IETF Secretariat From nobody Tue Feb 12 08:38:52 2019 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 BD73F128B33; Tue, 12 Feb 2019 08:38:50 -0800 (PST) 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, FREEMAIL_FROM=0.001, HTML_MESSAGE=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 v65YKfWv_ZN3; Tue, 12 Feb 2019 08:38:48 -0800 (PST) Received: from mail-qk1-x736.google.com (mail-qk1-x736.google.com [IPv6:2607:f8b0:4864:20::736]) (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 A97C712785F; Tue, 12 Feb 2019 08:38:45 -0800 (PST) Received: by mail-qk1-x736.google.com with SMTP id x9so9107133qkf.0; Tue, 12 Feb 2019 08:38:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=OC3MPDH3DAUmEF/rXjrBT3mmUfZYCljXPlFjmQAz5I8=; b=kUUYhAXJQjBoPsTRu7A3UCubdjwioJpS+gmkS8+DjgHvW+qemPsV09lumKDC7ZwscQ 8ECxXi++j3CuiELSNpjRI+Ha5cQyINoh53z5jSVQsGhGZdYTmhketZT/K/4Et4ndruWK 5SBERVnzsNyperH+oKhN/dE/IiGfbyXsvOWmhOyjokpJIOmwsmh/NFlL/uCh+I0l3j2I 8K6RRVIZ3eNnl8cRCvE7dSL6t5Ck7GTw9CBuf4ol+DdKHekcTDbxO6OxsRU1mcZlx7by rdrrUrZstHNZPckvgboFGEngsqOTqRJv1mev94F7rPpf1oEi13KqOA3jC6MObuh8YmRS HCpA== 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=OC3MPDH3DAUmEF/rXjrBT3mmUfZYCljXPlFjmQAz5I8=; b=AIz9RmhnLfQvonPASOpK3/ev6+ex9jSRaqnXuL1sNOUeDWAvaZ2iYZZkqSntnGK5kz QV7ZyBxqdrf9DYhviPYD73uhKSiksP+q/6akAB9h5Y9AGZcmY68MIOA6vFkuzq4RDyvu JLOjVFcpss0aYyGB8plG/N379W5fEAocg5bEXzHQC0UbgKuKejxHV5bA3W8/ULDefG+4 Ty8dMN6A6889lXSBU6DWbLc/mU/mXNhGNtHxMuE3onHTeLeLz09cbz7WPdp7wepltSWE x5cvFV/PPsjCGEKMYm8ziloUCE2ue1jmXKYHrqgjbH/Y8XRe8AWAQsnx8y1EYCvh52xn hu/w== X-Gm-Message-State: AHQUAuYPiMJB3I0AMovAm1M5NT5r3iMKJkWEzep1/s/2i5+zQFO+UX3p +hhcHDB09t73+RpxLD0+hX8D8qM8hohagVEzXrQyQk7D X-Google-Smtp-Source: AHgI3IbafUQYaqm+qxQ1kkV9Z6YHY7NONS3LLofgnWkPecrF3Y1GZLIwTQQD5bLAoyKZj2pKfPe2sVYzXmQpCC8LZDc= X-Received: by 2002:a37:7a06:: with SMTP id v6mr3221363qkc.10.1549989524255; Tue, 12 Feb 2019 08:38:44 -0800 (PST) MIME-Version: 1.0 References: <154998756083.8350.13395130928228954930@ietfa.amsl.com> In-Reply-To: <154998756083.8350.13395130928228954930@ietfa.amsl.com> From: "Andrew G. Malis" Date: Tue, 12 Feb 2019 11:38:33 -0500 Message-ID: To: sfc@ietf.org Cc: draft-ietf-sfc-nsh-ecn-support@ietf.org, sfc-chairs@ietf.org Content-Type: multipart/alternative; boundary="000000000000ffb8ea0581b50e74" Archived-At: Subject: [sfc] Fwd: IPR Disclosure Huawei Technologies Co., Ltd's Statement about IPR related to draft-ietf-sfc-nsh-ecn-support X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Feb 2019 16:38:51 -0000 --000000000000ffb8ea0581b50e74 Content-Type: text/plain; charset="UTF-8" SFCers, Please note the IPR disclosure below regarding draft-ietf-sfc-nsh-ecn-support. Donald and I had tried to get it done while this was still an individual draft, but due to an internal backlog followed by the Chinese New Year celebration, it was delayed until today. Please reply on the WG list if you have any questions or concerns regarding this disclosure. Thanks, Andy ---------- Forwarded message --------- From: IETF Secretariat Date: Tue, Feb 12, 2019 at 11:06 AM Subject: IPR Disclosure Huawei Technologies Co., Ltd's Statement about IPR related to draft-ietf-sfc-nsh-ecn-support To: Cc: , Dear Donald E. Eastlake 3rd, Bob Briscoe, Andrew G. Malis: An IPR disclosure that pertains to your Internet-Draft entitled "Explicit Congestion Notification (ECN) and Congestion Feedback Using the Network Service Header (NSH)" (draft-ietf-sfc-nsh-ecn-support) was submitted to the IETF Secretariat on and has been posted on the "IETF Page of Intellectual Property Rights Disclosures" (https://datatracker.ietf.org/ipr/3424/). The title of the IPR disclosure is "Huawei Technologies Co.,Ltd's Statement about IPR related to draft-ietf-sfc-nsh-ecn-support" Thank you IETF Secretariat --000000000000ffb8ea0581b50e74 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
SFCers,

Please note the IPR disclosure = below regarding draft-ietf-sfc-nsh-ecn-support. Donald and I had tried to g= et it done while this was still an individual draft, but due to an internal= backlog followed by the Chinese New Year celebration, it was delayed until= today. Please reply on the WG list if you have any questions or concerns r= egarding this disclosure.

Thanks,
Andy
----= ------ Forwarded message ---------
From: IETF Secretariat <ietf-ipr@ietf.org>
Date: Tue, F= eb 12, 2019 at 11:06 AM
Subject: IPR Disclosure Huawei Technologies Co.,= Ltd's Statement about IPR related to draft-ietf-sfc-nsh-ecn-supportTo: <draft-= ietf-sfc-nsh-ecn-support@ietf.org>
Cc: <ipr-announce@ietf.org>, <sfc@ietf.org>

Dear Donald E. Eastlake 3rd,= Bob Briscoe, Andrew G. Malis:

An IPR disclosure that pertains to your Internet-Draft entitled
"Explicit Congestion Notification (ECN) and Congestion Feedback Using<= br> the Network Service Header (NSH)" (draft-ietf-sfc-nsh-ecn-support) was=
submitted to the IETF Secretariat on=C2=A0 and has been posted on the "= ;IETF Page
of Intellectual Property Rights Disclosures"
(https://datatracker.ietf.org/ipr/3424/). The title of the= IPR disclosure is
"Huawei Technologies Co.,Ltd's Statement about IPR related to
draft-ietf-sfc-nsh-ecn-support"


Thank you

IETF Secretariat
--000000000000ffb8ea0581b50e74-- From nobody Wed Feb 13 16:35:25 2019 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 48838130EB9 for ; Wed, 13 Feb 2019 16:35:22 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.597 X-Spam-Level: X-Spam-Status: No, score=-0.597 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_COMMENT_SAVED_URL=1.391, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, T_HTML_ATTACH=0.01, 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 rlxzif4-fDdC for ; Wed, 13 Feb 2019 16:35:16 -0800 (PST) Received: from mail-lj1-x22a.google.com (mail-lj1-x22a.google.com [IPv6:2a00:1450:4864:20::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 7E847130EB4 for ; Wed, 13 Feb 2019 16:35:15 -0800 (PST) Received: by mail-lj1-x22a.google.com with SMTP id j19so2880506ljg.5 for ; Wed, 13 Feb 2019 16:35:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=kz/q/E/CsSV2BHOZTphKd3lSrl12h+ya33OH3rjlMew=; b=APc2c/hmnw0tjXxqIEhZ/5IH2+fldt2vO5uwD6DknVwCSFvr+bW6w7l9C2QjKRqAqp w9QGblJ//UogHqhatS3YU7vuvZNTJrjOh7p6DrO66nkSvJ8OBbPnS9uIO5QFGYrz51Ey 2odBxjedaG8xCBYkN0Tcoa+6KDyoBRuyIEjDHYSRy0jtA3P1ArUtD8cwl6bTnudBdOI5 8Ik1kmaSaHaaCFYMTzszHW7eBdUdJfkP9J+8488oaHZSMmP47QtfUyuwkEtjmc+J7HTe Y3ymudRK/M67gGw5AUNBAR29yculFbdlPGmeHOuVby5MBRM+G4XZu138oCnFDdnym6n9 DFGg== 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=kz/q/E/CsSV2BHOZTphKd3lSrl12h+ya33OH3rjlMew=; b=PT4jz9VEQ7Rb98gIXoWoRRzL70QTAzuJI2DlPrA/i3f1FvDW9x4Nos9MZMlahkzSRM rTH5jDFVRJvEzLhE1EuFGcY2Eal+tYCru0dTvECRuQgZyVo/6njFsD2QgwNY7vHL9eMc dLj95IAdc8/SNdiQVS53waqWQx5KM2nu8iUQw2FyT5OW54LVkiByG+/2oBli81C47PGU Er14nJ7R28B3SPixuSsEAcFroM7xD73Ob6jMg/3CzXLLtqT7U/WBTlL7NttQ4Sw2oiRj QZi/BcqkFXWHdcRSaeyPymOYdGdrSPFd9yNFkc5wc99kxtuj55kJzgKQkU8dVPZUJjV9 my1g== X-Gm-Message-State: AHQUAuYQ03Reo0KOVEiNdVFOg0iw4G+3lDrx7ga1U9br96LxxBoJH7GX I5zLok7CzS/ZG+2uCNfocst8YJEIiJKJmGAWGGk= X-Google-Smtp-Source: AHgI3Ib3NBlN6zQH/QQUizRzNQ4dg5NeV/tvTy0fMRs40l61fN47ebMQQnLL+imNH6PRRe1z+rtTe0EqY5SGLD7pNiI= X-Received: by 2002:a2e:86ca:: with SMTP id n10-v6mr451574ljj.49.1550104513430; Wed, 13 Feb 2019 16:35:13 -0800 (PST) MIME-Version: 1.0 References: <201901030041.x030fHSA068733@mse01.zte.com.cn> In-Reply-To: From: Greg Mirsky Date: Wed, 13 Feb 2019 16:35:01 -0800 Message-ID: To: Dirk.von-Hugo@telekom.de Cc: ao.ting@zte.com.cn, Service Function Chaining IETF list Content-Type: multipart/mixed; boundary="000000000000e3839e0581cfd4cd" Archived-At: Subject: Re: [sfc] Fw:New Version Notification for draft-ao-sfc-oam-path-consistency-04.txt X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 Feb 2019 00:35:22 -0000 --000000000000e3839e0581cfd4cd Content-Type: multipart/alternative; boundary="000000000000e383990581cfd4cb" --000000000000e383990581cfd4cb Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Dirk, et al., I've updated the Active SFC OAM draft to address comments from Dirk. Much appreciate your feedback whether changes captured and resolved them all. Will post the new version after your response. Regards, Greg On Tue, Feb 5, 2019 at 4:41 PM Greg Mirsky wrote: > Hi Dirk, > thank you for your kind words about the drafts, thoughtful comments, and > the most helpful suggestions. Will work on updating drafts and will share > the proposed changes with you shortly. > > Best regards, > Greg > > On Tue, Feb 5, 2019 at 8:06 AM wrote: > >> Dear all, >> >> I have read both drafts on extending SFC OAM by adding a reply path TLV >> for testing SFPs and for checking consistency of SFPs. >> >> I believe that for operators such measures are very useful when SFC is >> deployed in future networks and logical network slices. >> >> >> >> As both drafts rely on adopted WG draft >> https://tools.ietf.org/html/draft-ietf-sfc-multi-layer-oam-01 I also had >> a look at that one. >> >> Comments and nits: >> >> P.4: >> >> the service SFP1 may be realized through two RSPs, RSP1(SF1--SF3--SF5) >> and RSP2(SF2--SF4--SF5). =3D> >> >> the service SFP1 may be realized through two independent RSPs, >> RSP1(SF1--SF3--SF5) and RSP2(SF2--SF4--SF6). >> >> Since IMO there are further possible RSPs as SF1=E2=80=94SF4--SF5, SF1= =E2=80=94SF3=E2=80=94SF6, >> etc. >> >> P.7: >> >> BFD =3D> BFD (Bidirectional Forwarding Detection) >> >> P.8: >> >> o Reply via Specified Path (TBA7) =3D> o Reply via Specified Pat= h >> (TBA8) >> >> P.9/p.10: >> >> *5.2* >> *. >> SFC Echo Request Reception* >> >> *5.4* >> *. >> Overlay Echo Reply Reception* >> >> There is still text missing in both sections >> >> >> >> Regarding the main drafts in focus here I only have very minor comments >> (nits) on draft-ao-sfc-oam-returned-path-specified-02: >> >> P.2: >> >> [RFC7665], For example, =3D> [RFC7665]. For example, >> >> P.3: >> >> the SFC Reply Path TLV Section 4. =3D> the SFC Reply Path TLV as describ= ed >> in Section 4. >> >> P.5: >> >> return path is a SFP =3D> return path is an SFP >> >> SFP,it is assumed that the last SFF doesn't know the reply path of a SFC >> >> =3D> SFP, it is assumed that the last SFF doesn't know the reply path of= an >> SFC >> >> >> >> And on draft-ao-sfc-oam-path-consistency-04.txt: >> >> P.2: >> >> Sometimes, a SF needs to =3D> Sometimes, an SF needs to >> >> P.4: >> >> following values Section 5.1 =3D> following values further detailed in >> Section 5.1 >> >> as as described in Section=3D> as is described in Section >> >> P.6: >> >> list of the SFs are in load balance group >> >> =3D> list of the SFs which are in included in a load balance group. >> >> P.8/9: >> >> TBA1-TBA4, TBA6-TBA8 are requested but no TBA5?! >> >> >> >> As already said I think the extensions are useful and I see no open gaps= . >> >> Thanks! >> >> Kind regards >> >> Dirk >> >> >> >> *From:* sfc *On Behalf Of *ao.ting@zte.com.cn >> *Sent:* Mittwoch, 2. Januar 2019 15:42 >> *To:* sfc@ietf.org >> *Subject:* [sfc] Fw:New Version Notification for >> draft-ao-sfc-oam-path-consistency-04.txt >> >> >> >> Hi all=EF=BC=8C >> >> >> >> We have updated a new version for draft draft-ao-sfc-oam-path-consistenc= y-04 >> based on the discussion in the mailist. The main change is the COAM Repl= y >> message for load balance scenario in section 3.4.2. Any comments are >> always welcome. >> >> >> >> We think both draft-ao-sfc-oam-path-consistency-04( >> https://tools.ietf.org/html/draft-ao-sfc-oam-path-consistency-04) and >> draft-ao-sfc-oam-returned-path-specified-02( >> https://tools.ietf.org/html/draft-ao-sfc-oam-return-path-specified-02) >> are ready. We request for the consideration of the WG adoption. >> >> >> >> Best Regards. >> >> Ting Ao >> >> >> >> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6 >> >> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*internet-drafts@ietf.org >> >> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*Gregory Mirsky ;=E6=95=96=E5=A9=B700071246;Kent Leung < >> kleung@cisco.com>;Zhonghua Chen <18918588897@189.cn>;Greg Mirsky < >> gregimirsky@gmail.com>; >> >> *=E6=97=A5 **=E6=9C=9F **=EF=BC=9A*2018=E5=B9=B412=E6=9C=8827=E6=97=A5 1= 6:26 >> >> *=E4=B8=BB **=E9=A2=98 **=EF=BC=9ANew Version Notification for >> draft-ao-sfc-oam-path-consistency-04.txt* >> >> >> A new version of I-D, draft-ao-sfc-oam-path-consistency-04.txt >> has been successfully submitted by Ting Ao and posted to the >> IETF repository. >> >> Name: draft-ao-sfc-oam-path-consistency >> Revision: 04 >> Title: SFC OAM for path consistency >> Document date: 2018-12-27 >> Group: Individual Submission >> Pages: 11 >> URL: >> https://www.ietf.org/internet-drafts/draft-ao-sfc-oam-path-consistency-0= 4.txt >> Status: >> https://datatracker.ietf.org/doc/draft-ao-sfc-oam-path-consistency/ >> Htmlized: >> https://tools.ietf.org/html/draft-ao-sfc-oam-path-consistency-04 >> Htmlized: >> https://datatracker.ietf.org/doc/html/draft-ao-sfc-oam-path-consistency >> Diff: >> https://www.ietf.org/rfcdiff?url2=3Ddraft-ao-sfc-oam-path-consistency-04 >> >> Abstract: >> Service Function Chain (SFC) defines an ordered set of service >> functions (SFs) to be applied to packets and/or frames and/or flows >> selected as a result of classification. SFC Operation, >> Administration and Maintenance can monitor the continuity of the SFC, >> i.e., that all elements of the SFC are reachable to each other in the >> downstream direction. But SFC OAM must support verification that the >> order of traversing these SFs corresponds to the state defined by the >> SFC control plane or orchestrator, the metric referred in this >> document as the path consistency of the SFC. This document defines a >> new SFC OAM method to support SFC consistency check, i.e. >> verification that all elements of the given SFC are being traversed >> in the expected order. >> >> >> >> >> >> >> Please note that it may take a couple of minutes from the time of submis= sion >> until the htmlized version and diff are available at tools.ietf.org. >> >> The IETF Secretariat >> >> >> _______________________________________________ >> sfc mailing list >> sfc@ietf.org >> https://www.ietf.org/mailman/listinfo/sfc >> > --000000000000e383990581cfd4cb Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Dirk, et al.,
I've updated the Active SFC OAM d= raft to address comments from Dirk. Much appreciate your feedback whether c= hanges captured and resolved them all. Will post the new version after your= =C2=A0response.

Regards,
Greg

On Tu= e, Feb 5, 2019 at 4:41 PM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Dirk,
thank you for yo= ur kind words about the drafts, thoughtful comments, and the most helpful s= uggestions. Will work on updating drafts and will share the proposed change= s with you shortly.=C2=A0

Best regards,
= Greg

On Tue, Feb 5, 2019 at 8:06 AM <Dirk.von-Hugo@telekom.de> wrote:
=

Dear all,

I have read both drafts on ex= tending SFC OAM by adding a reply path TLV for testing SFPs and for checkin= g consistency of SFPs.

I believe that for operators = such measures are very useful when SFC is deployed in future networks and l= ogical network slices.

=C2=A0

As both drafts rely on adopte= d WG draft https://tools.ietf.org/html/= draft-ietf-sfc-multi-layer-oam-01 I also had a look at that one.

Comments and nits:<= /u>

P.4:

the service SFP1 may be realized through two RSP= s, RSP1(SF1--SF3--SF5) and RSP2(SF2--SF4--SF5). =3D>

the service SFP1 may be realized through two ind= ependent RSPs, RSP1(SF1--SF3--SF5) and RSP2(SF2--SF4--SF6).

Since IMO there are further p= ossible RSPs as SF1=E2=80=94SF4--SF5, SF1=E2=80=94SF3=E2=80=94SF6, etc.<= /u>

P.7:

BFD= =3D> BFD (Bidirectional Forwarding Detection)

P.8:

=C2=A0=C2=A0 o=C2=A0 Reply via Specified Path (T= BA7) =3D> =C2=A0=C2=A0=C2=A0o=C2=A0 Reply via Specified Path (TBA8)

P.9/p.10:

5.2.=C2=A0 SFC Echo Request Reception

5.4.=C2=A0 Overlay Echo Reply Reception

There is still text missing in both sections<= /u>

=C2=A0

Regarding the main drafts in = focus here I only have very minor comments (nits) on draft-ao-sfc-oam-returned-path-specified-02:

P.2:

[RF= C7665], For example, =3D> [RFC7665]. For example,

P.3:

<= span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:"Courier New= ";color:black;background:rgb(255,253,245)">the SFC Reply Path TLV Sect= ion 4. =3D> the SFC Reply Path TLV as described in Section 4.<= /u>

P.5:

ret= urn path is a SFP =3D> return path is an SFP

<= span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:"Courier New= ";color:black;background:rgb(255,253,245)">SFP,it is assumed that the = last SFF doesn't know the reply path of a SFC

<= span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:"Courier New= ";color:black;background:rgb(255,253,245)">=3D> SFP, it is assumed = that the last SFF doesn't know the reply path of an SFC

=C2=A0

And on draft-ao-sfc-oam-path-consistency-04.txt:

P.2:

Som= etimes, a SF needs to =3D> Sometimes, an SF needs to

P.4:

fol= lowing values Section 5.1 =3D> following values further detailed in Sect= ion 5.1

as = as described in Section=3D> as is described in Section

P.6:

<= span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:"Courier New= ";color:black;background:rgb(255,253,245)">list of the SFs are in load= balance group

<= span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:"Courier New= ";color:black;background:rgb(255,253,245)">=3D> list of the SFs whi= ch are in included in a load balance group.

P.8/9:

<= span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:"Courier New= ";color:black;background:rgb(255,253,245)">TBA1-TBA4, TBA6-TBA8 are re= quested but no TBA5?!

=C2=A0

As already said I think the e= xtensions are useful and I see no open gaps.

Thanks!<= /p>

Kind regards

Dirk

=C2=A0

From: sfc <sfc-bounces@ietf.org> On Behalf Of ao.ting@zte.com.cn
Sent: Mittwoch, 2. Januar 2019 15:42
To: sfc@ietf.org
Subject: [sfc] Fw:New Version Notification for draft-ao-sfc-oam-path= -consistency-04.txt

=C2=A0

Hi all=EF= =BC=8C=

=C2= =A0

We have up= dated a new version for draft=C2=A0draft-a= o-sfc-oam-path-consistency-04 based on the discussion in the mailist. The m= ain change is the COAM Reply message for load balance scenario in section 3.4.2.=C2=A0 Any comments are always welc= ome.

=C2= =A0

We think both draft-ao-sfc-oam-path-consistency-04(https://tools.ietf.org/html/draft-ao-sfc-oam-path-consistency-04) and draft-ao-sfc-oam-returned-path-specified-02(h= ttps://tools.ietf.org/html/draft-ao-sfc-oam-return-path-specified-02) a= re ready. We request for the consideration of the WG adoption.

=C2= =A0

Best Regar= ds.

Ting Ao<= /span>

=C2=A0<= /p>

=E5= =8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6

=E5=8F=91= =E4=BB=B6=E4=BA=BA=EF=BC=9Ainternet-drafts@ietf.org <internet-drafts= @ietf.org>

=E6=94=B6=E4=BB=B6=E4=BA=BA=EF= =BC=9AGregory Mirsky <gregimirsky@gmail.com>;=E6=95=96=E5=A9=B7= 00071246;Kent Leung <kleung@cis= co.com>;Zhonghua Chen <18918588897@189.cn>;Greg Mirsky <gregimirsky@gmail.com>;

=E6=97=A5 =E6=9C= =9F =EF=BC=9A2018=E5=B9=B412= =E6=9C=8827=E6=97= =A5 16:26

=E4=B8=BB =E9=A2=98 =EF=BC= =9ANew Version Notification for draft-ao-sfc-oam-path-consistency-04= .txt


A=C2=A0new=C2=A0version=C2=A0of=C2=A0I-D,=C2=A0draft-ao-sfc-oam-path-consis= tency-04.txt
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IETF=C2=A0repository.

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Revision:=C2=A0=C2=A0=C2=A0=C2=A004
Title:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0SFC=C2=A0OAM=C2=A0for= =C2=A0path=C2=A0consistency
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Htmlized:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0http= s://tools.ietf.org/html/draft-ao-sfc-oam-path-consistency-04
Htmlized:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0https://datatracker.ietf.org/doc/html/draft-ao-sfc-oam-path-consistency<= /a>
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Abstract:
=C2=A0=C2=A0=C2=A0Service=C2=A0Function=C2=A0Chain=C2=A0(SFC)=C2=A0defines= =C2=A0an=C2=A0ordered=C2=A0set=C2=A0of=C2=A0service
=C2=A0=C2=A0=C2=A0functions=C2=A0(SFs)=C2=A0to=C2=A0be=C2=A0applied=C2=A0to= =C2=A0packets=C2=A0and/or=C2=A0frames=C2=A0and/or=C2=A0flows
=C2=A0=C2=A0=C2=A0selected=C2=A0as=C2=A0a=C2=A0result=C2=A0of=C2=A0classifi= cation.=C2=A0=C2=A0SFC=C2=A0Operation,
=C2=A0=C2=A0=C2=A0Administration=C2=A0and=C2=A0Maintenance=C2=A0can=C2=A0mo= nitor=C2=A0the=C2=A0continuity=C2=A0of=C2=A0the=C2=A0SFC,
=C2=A0=C2=A0=C2=A0i.e.,=C2=A0that=C2=A0all=C2=A0elements=C2=A0of=C2=A0the= =C2=A0SFC=C2=A0are=C2=A0reachable=C2=A0to=C2=A0each=C2=A0other=C2=A0in=C2= =A0the
=C2=A0=C2=A0=C2=A0downstream=C2=A0direction.=C2=A0=C2=A0But=C2=A0SFC=C2=A0O= AM=C2=A0must=C2=A0support=C2=A0verification=C2=A0that=C2=A0the
=C2=A0=C2=A0=C2=A0order=C2=A0of=C2=A0traversing=C2=A0these=C2=A0SFs=C2=A0co= rresponds=C2=A0to=C2=A0the=C2=A0state=C2=A0defined=C2=A0by=C2=A0the
=C2=A0=C2=A0=C2=A0SFC=C2=A0control=C2=A0plane=C2=A0or=C2=A0orchestrator,=C2= =A0the=C2=A0metric=C2=A0referred=C2=A0in=C2=A0this
=C2=A0=C2=A0=C2=A0document=C2=A0as=C2=A0the=C2=A0path=C2=A0consistency=C2= =A0of=C2=A0the=C2=A0SFC.=C2=A0=C2=A0This=C2=A0document=C2=A0defines=C2=A0a<= br> =C2=A0=C2=A0=C2=A0new=C2=A0SFC=C2=A0OAM=C2=A0method=C2=A0to=C2=A0support=C2= =A0SFC=C2=A0consistency=C2=A0check,=C2=A0i.e.
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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 4mWv4_k17F0T; Sat, 16 Feb 2019 07:48:02 -0800 (PST) Received: from mail-lj1-f174.google.com (mail-lj1-f174.google.com [209.85.208.174]) (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 5BEDF1275F3; Sat, 16 Feb 2019 07:48:02 -0800 (PST) Received: by mail-lj1-f174.google.com with SMTP id z25so3028546ljk.8; Sat, 16 Feb 2019 07:48:02 -0800 (PST) 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; bh=fjM90OsfjVfZcKva1VBJ7ZCVovtil0kJiZnlpMYkzSc=; b=aNM6sPcNw1BJi/dPnUu+spBnayGBVVyPlh1Xi8WOBEm/G3fbasIYMUFF7+qTpU3yRb +2dRtZO8I5qJl5CDu98JnvErJk4UTEV+ewGzGnXhOu2+alTGoHPNTKD57bcSdEKNfDj0 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List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 16 Feb 2019 15:48:05 -0000 --000000000000e80cf2058204d014 Content-Type: text/plain; charset="UTF-8" Hi, Please find among many others some IETF related topics [1] that will be discussed at netdev0x13 just before the IETF meeting in Pragues. Early bird registration is open until February 20. !!!! Netdev 0x13 will be held at Hotel Grandium in Prague, this spring March 20th - 22th, 2019 Yours, Daniel [1] https://www.netdevconf.org/0x13/IETF-relevant-talks.html --000000000000e80cf2058204d014 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Hi,

=C2=A0

Please find among many others some IET= F related topics [1] that will be discussed at netdev0x13 just before the IETF meeting in Pragues.

=C2=A0

Early bird registration is open until= =C2=A0February 20.=C2=A0!!!!

=C2=A0

Netdev 0x13 will be held at Hotel Grandium in Prague, this spring March 2= 0th - 22th, 2019=C2=A0


=

Yours,

Daniel

=C2=A0

[1] https://www.netdevconf.org/0x13/IETF-relevant-talks.html


--000000000000e80cf2058204d014-- From nobody Wed Feb 20 17:22:50 2019 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 7D490130E25 for ; Wed, 20 Feb 2019 17:22:49 -0800 (PST) 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 3a-QyrstOl9d for ; Wed, 20 Feb 2019 17:22:47 -0800 (PST) Received: from maila2.tigertech.net (maila2.tigertech.net [208.80.4.152]) (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 CF124126F72 for ; Wed, 20 Feb 2019 17:22:47 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by maila2.tigertech.net (Postfix) with ESMTP id 444cCq3kW7z1xmQQ for ; Wed, 20 Feb 2019 17:22:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=2.tigertech; t=1550712167; bh=1ZGLJ6KoPSHKiEk+0d453Gsnpk4ajXGFc3aS+vrz4LM=; h=To:From:Subject:Date:From; b=Lzfkx4QiL1yeZDrbbRxsFEFq0c5SFHNdCckcIWHwzSePFbNpUfMzt3USFbeStQnve njI0IDz5TI2tzhtVM46QQyC1Yb0uWfG70fWFTD6nsw5Fnlt8RIuUNEx1D8YiPeUxPI zvaV+SIEiCTbHeAxbycTBqZOI4i0tzqI+G3RiFi4= X-Virus-Scanned: Debian amavisd-new at maila2.tigertech.net Received: from Joels-MacBook-Pro.local (209-255-163-147.ip.mcleodusa.net [209.255.163.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 444cCq0b3Cz1xmQP for ; Wed, 20 Feb 2019 17:22:46 -0800 (PST) To: "sfc@ietf.org" From: "Joel M. Halpern" Message-ID: <3691d248-d27c-486a-b8d7-8a1b931779ce@joelhalpern.com> Date: Wed, 20 Feb 2019 20:22:45 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 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] draft-ietf-sfc-nsh-dc-allocation X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Feb 2019 01:22:49 -0000 I was trying to see what items I had forgotten for this working group, and looked at: https://datatracker.ietf.org/doc/draft-ietf-sfc-nsh-dc-allocation/ We issued a working group last call for this Informational document last September. At the time, there was very little support for it. Given the lack of interest, I think we have to conclude that the working group does not see value in publishing this. If the authors wish to take it to the Independent Stream, they are free to do so. If someone sees evidence I have missed, please speak up. Yours, Joel From nobody Thu Feb 21 10:07:00 2019 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 37AA713108C; Thu, 21 Feb 2019 10:06:39 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.998 X-Spam-Level: X-Spam-Status: No, score=-1.998 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_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 (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 Q0jiG1PUf4hm; Thu, 21 Feb 2019 10:06:36 -0800 (PST) Received: from mail-qt1-x82d.google.com (mail-qt1-x82d.google.com [IPv6:2607:f8b0:4864:20::82d]) (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 37FD413108B; Thu, 21 Feb 2019 10:06:36 -0800 (PST) Received: by mail-qt1-x82d.google.com with SMTP id s1so6406931qte.5; Thu, 21 Feb 2019 10:06:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=5DU4A0cvGiFJKJgChxt6BFxScRZRP68oR2x9avJDc8s=; b=g3oI8bSYnqbVepOEeQYYV3TKwSlZhxF8IEai1gx9y/As8GdKibiWAXGuq3s6ioV5JY tjETYqRVXurBP/A7kj8xIHUD+/4UI8bm/V47/TwrLD6ErrSKPbAghf9oYdkkVRw8NoEQ Ow6KUXffdsSe5VRFUrBlYw2fTvbrHfwkpuGB82SxQ9vZ8qdjgPVMscx3E0hZbP8c6JOu Nu12sZBIKs2uuyE+Xi3lr2XmlBL11Yurpo1hzldVogDJ8uwFzJ10+tRt3Nc+p34NsxpI 7ohoNnQgF3+zsAuo4gwouVpNITUyEdzhISlMzOC7a4Gre8uYAsrk4dt0eOjxbWve6MsU iCFQ== 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=5DU4A0cvGiFJKJgChxt6BFxScRZRP68oR2x9avJDc8s=; b=ayuxcEKWSVlAgxH1fOmyIOYDDgyrNdU3jYiGzpQ6xLPZAUAyXZ28+N4wDoNtMSPXct 8vOqEMX+sMoqdVUVq00JzyzoKVWvwcWOOb0Sh7mVP2zE23Y4u6ES9BSnmMuHmCfRh0x0 ei3bAV9ZcYCnuCS8zXajW7Q5GJy/k+B8k1l1cEQtiTaNm2K9aEHs/mhJTdEz+OWni4HD kqIBLeXXhp7oUu4y/0uO6+OdYt2EwhjwJZybtw89hNLELnCL5qxXaZJDUnQAfuZZKCOA tlDr4vu5/9u/h/gv1BrcWvQAQU2utNjVDAp+Sni216O68Y84gkUaEBKkIuexR9P/psbT gfoQ== X-Gm-Message-State: AHQUAuY5SjqVSYYP8Dp9a19RQI9XK/ET4tS+Ctdc5T5vSY6rFmqxyJy6 UBDx+Le004tFnfepZGy9FuYLu1bUMdHcNDTHSrolzep8 X-Google-Smtp-Source: AHgI3IZM/RpfgQ6z50h4yolpC/D1atzYCW/RjxNgKlhSXmiWzOvXNNkHzzpWPcQVuMneN7EtN9pOocozP4ozNGDR0BI= X-Received: by 2002:ac8:38ba:: with SMTP id f55mr32200094qtc.192.1550772395135; Thu, 21 Feb 2019 10:06:35 -0800 (PST) MIME-Version: 1.0 References: <155072147698.20210.381511429964485828@ietfa.amsl.com> In-Reply-To: <155072147698.20210.381511429964485828@ietfa.amsl.com> From: "Andrew G. Malis" Date: Thu, 21 Feb 2019 13:06:23 -0500 Message-ID: To: Carlos Pignataro Cc: ops-dir@ietf.org, mpls@ietf.org, draft-ietf-mpls-sfc-encapsulation.all@ietf.org, IETF Discussion , sfc@ietf.org Content-Type: multipart/alternative; boundary="000000000000bd572905826b55f9" Archived-At: Subject: Re: [sfc] [mpls] Opsdir last call review of draft-ietf-mpls-sfc-encapsulation-02 X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Feb 2019 18:06:40 -0000 --000000000000bd572905826b55f9 Content-Type: text/plain; charset="UTF-8" Carlos, Many thanks for your review! I'm also including the SFC WG on my reply. Comments inline. On Wed, Feb 20, 2019 at 10:58 PM Carlos Pignataro wrote: > Reviewer: Carlos Pignataro > Review result: Has Issues > > Reviewer: Carlos Pignataro > Review Result: Has Issues > > I have reviewed this document as part of the Operational directorate's > ongoing effort to review all IETF documents being processed by the IESG. > These > comments were written with the intent of improving the operational aspects > of > the IETF drafts. Comments that are not addressed in last call may be > included > in AD reviews during the IESG review. Document editors and WG chairs > should > treat these comments just like any other last call comments. > > This document is highly readable, includes very clear textual > descriptions, and > is very well organized. Easy to read in its simplicity. However, it would > benefit from a more explicit connection to the transport encap mechanics > from > RFC 8300 (e.g., S4, S6.1). Specifically, I'd recommend adding a Figure or > an > SFF NSH Mapping Table example, to depict and/or exemplify the SFF function. > I'm trying to envision what would make a good figure here. We could add an additional line to Table 1 of RFC 8300 and reference that table: +------+------+---------------------+-------------------------+ | SPI | SI | Next Hop(s) | Transport Encapsulation | +------+------+---------------------+-------------------------+ | 25 | 220 | Label 5467 | MPLS | +------+------+---------------------+-------------------------+ Is that what you had in mind? If not, I'm open to other suggestions. > > >From an Operational standpoint, the document seems largely appropriate in > terms > of dataplane considerations. Some key considerations are explicitly out of > scope: > The method used by the downstream receiving node to advertise SFF > Labels to the upstream sending node is out of scope of this document. > > This really seems to mean that, with the simple definition in this > Informational document, interoperable implementations cannot yet exist. If > there is no mechanism to advertise the SFF Label or to manage the > semantics of > this particular label, how will it know? Static configuration, which is not > covered anyway, is not in my humble opinion a manageable scalable approach. > Actually, while it is outside the scope of this document, it is within the scope of draft-ietf-bess-nsh-bgp-control-plane, and text is being added to the next revision of that draft to show how it can be used to signal the encapsulation defined here. This was worked out after this draft was forwarded to the IESG, but we can now add a reference to that draft seeing as we'll be doing a post-last-call update. > > Title: MPLS Encapsulation For The SFC NSH > > RFC 8300 makes an explicit distinction between the terms 'encapsulation' > and > 'transport encapsulation' (see e.g., Figure 1, Section 1.5 5., and Section > 4 of > RFC 8300). > > It seems to me that this is the "MPLS Transport Encapsulation for the SFC > NSH" > Thanks, we'll fix that. > > 2. MPLS Encapsulation Using an SFF Label > > Similarly, "2. MPLS Transport Encapsulation Using an SFF Label" > > The encapsulation is a standard MPLS label stack [RFC3032] with an > SFF Label at the bottom of the stack, followed by a NSH as defined by > [RFC8300] and the NSH payload. > > Insteadf of "NSH payload" I think "orignal packet" is meant. > RFC 8300 uses both "payload" and "original packet/frame", but the latter more than the former. So we can change "payload" to "original packet/frame". > > Also, this encapsulation is Underdefined: What is the value of TTL? TC? > I've been looking back at other related RFCs (such as PW and IP VPN label definitions) and they're also mostly silent on these values. I did find the following in RFC 6073: The setting of the TTL of the PW MPLS label is a matter of local policy on the originating PE, but SHOULD be set to 255. Regarding the TC, we can follow the example of RFC 6391: This document does not define a use for the Traffic Class (TC) field [RFC5462 ] (formerly known as the Experimental Use (EXP) bits [RFC3032 ]) in the flow label. Future documents may define a use for these bits; therefore, implementations conforming to this specification MUST set the TC field to zero at the ingress and MUST ignore them at the egress. Do you have any alternative suggestions? > > Much like a pseudowire label, an SFF Label is allocated by the > downstream receiver of the NSH from its per-platform label space. > > A PW Label is more restrictive. RFC 8077 says it MUST be allocated as > per-platform: > > egress LSR only. Note that the PW label must always be at the bottom > of the packet's label stack, and labels MUST be allocated from the > per-platform label space. > > Is this the case for the SFF Label as well? If so, what is the implication > of > the MUST? If not, why is it different than other equivalent similar labels? > We can change the text to: Much like a pseudowire label, an SFF Label MUST be allocated by the downstream receiver of the NSH from its per-platform label space, since the meaning of the label is identical independent of which incoming interface it is received [RFC3031]. > 2. Push the SFF Label to identify the desired SFF in the receiving > MPLS node. > > TTL value? 1? 2? 255 for GTSM? GTSM RFC 5082 could be used here. > As I noted above, 255, although I used RFC 6073 as my source rather than 5082. We'll add that here as well. > 4. Operations, Administration, and Maintenance (OAM) Considerations > > OAM at the SFC Layer is handled by SFC-defined mechanisms [RFC8300]. > However, OAM may be required at the MPLS transport layer. If so, > then standard MPLS-layer OAM mechanisms such as the Generic > Associated Channel [RFC5586] label may be used. > > RFC 5586 is _not_ an OAM mechanism. It is an associated channel creation > mechanism, over which OAM could be carried. > > Thus, what traditional MPLS OAM can be carried here? Things like RFC 4379 > / RFC > 8029 would need the definition of an SFF Label FEC (which does not exist). > Which other one? IP/ICMP seems of very limited value. > That's a good point about RFC 5586. The intention is that the MPLS OAM would be at the transport label layer above the SFF label, so most any MPLS-layer OAM would be applicable. So how about rewording to make that more clear: OAM at the SFC Layer is handled by SFC-defined mechanisms [RFC8300]. However, OAM may be required at the MPLS transport layer. If so, then standard MPLS-layer OAM mechanisms may be used at the transport label layer (the labels above the SFF label). > > 6. Security Considerations > > Have you considered the use of GTSM? > No, we hadn't. Can you point me to any examples of GTSM being used in an MPLS or PW context? > > 8. References > > [RFC7665] Halpern, J., Ed. and C. Pignataro, Ed., "Service Function > Chaining (SFC) Architecture", RFC 7665, > DOI 10.17487/RFC7665, October 2015, > . > > SHould RFC 7665 be Normative? It defines the "SFF" which is quite central > to > understanding this document. > Good point. It was there because 7665 is an Informational RFC, but RFC 8067 does allow normative references to informational RFCs, so I'll move it. > > Other Nits and Editorials: > > SFF Labels are similar to other service labels at the bottom of an > MPLS label stack that denote the contents of the MPLS payload being > other than IP, such as a layer 2 pseudowire, an IP packet that is > routed in a VPN context with a private address, or an Ethernet > virtual private wire service. > > This says "being other than IP, such as IP", which seems to be > self-contradictory :-) > > :-) How about we change "other than IP," to "other than a normally routed IP packet", Thanks again, Andy --000000000000bd572905826b55f9 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Carlos,

Man= y thanks for your review! I'm also including the SFC WG on my reply.

Comments inline.

On Wed, Feb 20, 2019 at 10:58 PM Car= los Pignataro <cpignata@cisco.com<= /a>> wrote:
R= eviewer: Carlos Pignataro
Review result: Has Issues

Reviewer: Carlos Pignataro
Review Result: Has Issues

I have reviewed this document as part of the Operational directorate= 9;s
ongoing effort to review all IETF documents being processed by the I= ESG.=C2=A0 These
comments were written with the intent of improving the = operational aspects of
the IETF drafts. Comments that are not addressed = in last call may be included
in AD reviews during the IESG review.=C2=A0= Document editors and WG chairs should
treat these comments just like an= y other last call comments.

This document is highly readable, includes very clear textual descripti= ons, and
is very well organized. Easy to read in its simplicity. However= , it would
benefit from a more explicit connection to the transport enca= p mechanics from
RFC 8300 (e.g., S4, S6.1). Specifically, I'd recomm= end adding a Figure or an
SFF NSH Mapping Table example, to depict and/o= r exemplify the SFF function.


<= /div>
      +------=
+------+---------------------+-------------------------+
      | SPI  | SI   | Next Hop(s)   =
      | Transport Encapsulation |
      +------+------+---------------------+-------------------------+
= 
      | 25   | 220  | L=
abel 5467          | MPLS                    |
      +------+------+---------------------+---=
----------------------+

=
Is that what you had in mind? If not, I'm open to other sugg= estions.
=C2=A0

>From an Operational standpoint, the document seems largely appropri= ate in terms
of dataplane considerations. Some key considerations are ex= plicitly out of
scope:
=C2=A0 =C2=A0The method used by the downstream= receiving node to advertise SFF
=C2=A0 =C2=A0Labels to the upstream sen= ding node is out of scope of this document.

This really seems to mean that, with the simple definition in this
I= nformational document, interoperable implementations cannot yet exist. Ifthere is no mechanism to advertise the SFF Label or to manage the semanti= cs of
this particular label, how will it know? Static configuration, whi= ch is not
covered anyway, is not in my humble opinion a manageable scala= ble approach.

Actually, while it is out= side the scope of this document, it is within the scope of=C2=A0draft-ietf-= bess-nsh-bgp-control-plane, and text is being added to the next revision of= that draft to show how it can be used to signal the encapsulation defined = here. This was worked out after this draft was forwarded to the IESG, but w= e can now add a reference to that draft seeing as we'll be doing a post= -last-call update.
=C2=A0

Title: MPLS Encapsulation For The SFC NSH

RFC 8300 makes an explicit distinction between the terms 'encapsula= tion' and
'transport encapsulation' (see e.g., Figure 1, Sec= tion 1.5 5., and Section 4 of
RFC 8300).

It seems to me that this is the "MPLS Transport Encapsulation for = the SFC NSH"

Thanks, we'll fix= that.
=C2=A0

2.=C2=A0 MPLS Encapsulation Using an SFF Label

Similarly, "2. MPLS Transport Encapsulation Using an SFF Label&quo= t;

=C2=A0 =C2=A0The encapsulation is a standard MPLS label stack [RFC3032]= with an
=C2=A0 =C2=A0SFF Label at the bottom of the stack, followed by = a NSH as defined by
=C2=A0 =C2=A0[RFC8300] and the NSH payload.

Insteadf of "NSH payload" I think "orignal packet" = is meant.

RFC 8300 uses both "payl= oad" and "original packet/frame", but the latter more than t= he former. So we can change "payload" to "original packet/fr= ame".
=C2=A0

Also, this encapsulation is Underdefined: What is the value of TTL? TC?=

I've been looking back at other re= lated RFCs (such as PW and IP VPN label definitions) and they're also m= ostly silent on these values. I did find the following in RFC 6073:



   This document does not define a use for=
 the Traffic Class (TC) field
   [RFC5462] (forme=
rly known as the Experimental Use (EXP) bits
   [RFC3032]) in the flow label.  Future documents=
 may define a use for
   these bits; therefore, implementations conforming to this
   specification MUST set the TC field to zero at the ingress and MUST
   ignore them at the egress.

Do you have = any alternative suggestions?
=C2=A0

=C2=A0 =C2=A0Much like a pseudowire label, an SFF Label is allocated by= the
=C2=A0 =C2=A0downstream receiver of the NSH from its per-platform l= abel space.

A PW Label is more restrictive. RFC 8077 says it MUST be allocated asper-platform:

=C2=A0 =C2=A0egress LSR only.=C2=A0 Note that the PW label must always = be at the bottom
=C2=A0 =C2=A0of the packet's label stack, and label= s MUST be allocated from the
=C2=A0 =C2=A0per-platform label space.

Is this the case for the SFF Label as well? If so, what is the implicat= ion of
the MUST? If not, why is it different than other equivalent simil= ar labels?

We can change the text to:

=C2=A0Much like a pseudowire label, an SFF Label MU= ST be allocated by the downstream receiver of the NSH from its per-platform= label space, since the meaning of the label is identical independent of wh= ich incoming interface it is received [RFC3031].


=C2=A0 =C2=A02.=C2=A0 Push the SFF Label to identify the desired SFF in= the receiving
=C2=A0 =C2=A0 =C2=A0 =C2=A0MPLS node.

TTL value? 1? 2? 255 for GTSM? GTSM RFC 5082 could be used here.

As I noted above, 255, although I used RFC 60= 73 as my source rather than 5082. We'll add that here as well.


4.=C2=A0 Operations, Administration, and Maintenance (OAM) Consideratio= ns

=C2=A0 =C2=A0OAM at the SFC Layer is handled by SFC-defined mechanisms = [RFC8300].
=C2=A0 =C2=A0However, OAM may be required at the MPLS transpo= rt layer.=C2=A0 If so,
=C2=A0 =C2=A0then standard MPLS-layer OAM mechani= sms such as the Generic
=C2=A0 =C2=A0Associated Channel [RFC5586] label = may be used.

RFC 5586 is _not_ an OAM mechanism. It is an associated channel creatio= n
mechanism, over which OAM could be carried.

Thus, what traditional MPLS OAM can be carried here? Things like RFC 43= 79 / RFC
8029 would need the definition of an SFF Label FEC (which does = not exist).
Which other one? IP/ICMP seems of very limited value.

That's a good point about RFC 5586. The i= ntention is that the MPLS OAM would be at the transport label layer above t= he SFF label, so most any MPLS-layer OAM would be applicable. So how about = rewording to make that more clear:

OAM at the SFC = Layer is handled by SFC-defined mechanisms [RFC8300]. However, OAM may be r= equired at the MPLS transport layer.=C2=A0 If so, then standard MPLS-layer = OAM mechanisms may be used at the transport label layer (the labels above t= he SFF label).
=C2=A0

6.=C2=A0 Security Considerations

Have you considered the use of GTSM?

No, we hadn't. Can you point me to any examples of GTSM being used in= an MPLS or PW context?
=C2=A0

8.=C2=A0 References

=C2=A0 =C2=A0[RFC7665]=C2=A0 Halpern, J., Ed. and C. Pignataro, Ed., &q= uot;Service Function
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Ch= aining (SFC) Architecture", RFC 7665,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 DOI 10.17487/RFC7665, October 2015,
=C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <https://www.rfc-editor= .org/info/rfc7665>.

SHould RFC 7665 be Normative? It defines the "SFF" which is q= uite central to
understanding this document.

Good point. It was there because 7665 is an Informational RFC, but= RFC 8067 does allow normative references to informational RFCs, so I'l= l move it.
=C2=A0

Other Nits and Editorials:

=C2=A0 =C2=A0SFF Labels are similar to other service labels at the bott= om of an
=C2=A0 =C2=A0MPLS label stack that denote the contents of the M= PLS payload being
=C2=A0 =C2=A0other than IP, such as a layer 2 pseudowi= re, an IP packet that is
=C2=A0 =C2=A0routed in a VPN context with a pri= vate address, or an Ethernet
=C2=A0 =C2=A0virtual private wire service.<= br>
This says "being other than IP, such as IP", which seems to b= e
self-contradictory :-)

:-)

How about we change "other than IP," to "other than a= normally routed IP packet",

Thanks again,
Andy

--000000000000bd572905826b55f9-- From nobody Thu Feb 21 17:42:19 2019 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 0431D12D7EA; Thu, 21 Feb 2019 17:41:58 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.501 X-Spam-Level: X-Spam-Status: No, score=-14.501 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, 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, 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 6Q6mAMMcrMvG; Thu, 21 Feb 2019 17:41:55 -0800 (PST) Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C28EB128B01; Thu, 21 Feb 2019 17:41:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=43432; q=dns/txt; s=iport; t=1550799714; x=1552009314; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=aWggBEghsItTOFXRZltTXQ8YlsL7WhhFg9VdsH/lKbQ=; b=dihJBnzY8BpnQ+ncqClSPsgmktdkT4qnkxy8h58uULh5qz/bterlca8i iLkNcmeTv36QAw4PHdIjbYhYx4ZNvJq+0gtfMHkwiNVDiNNbGOikcKRdc dA+wwJ3XdRtcjItm7cqxCkTm0GRC7exGsNrQ986QSvpfXs0nS/nlBafl0 s=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0AKAADlUW9c/5xdJa1bChoBAQEBAQI?= =?us-ascii?q?BAQEBBwIBAQEBgVMDAQEBAQsBgQ1MKmeBAycKg32VWIlSjnGBewsBASOESQI?= =?us-ascii?q?Xg2MiNgcNAQMBAQIBAQJtHAyFSwYjRBIQAgEIEiYBBgMCAgIfERQDDgIEDgW?= =?us-ascii?q?DIAGBDkwDFQ+sEYEvhENBgwINghkFjEgXgUA/gREnDBOCTIJXRwEBAwGBMgQ?= =?us-ascii?q?mgwoxgiYCigcDB4F9hCOHF4s0JDMJAoc8h2SDPBmBcYVag0GEY4Mci1mEPoE?= =?us-ascii?q?tiCCCbAIRFIEoJg0kgVZwFRpLAYINATM+gWoFEoEAAQiHVoU/QTGNPoEugR8?= =?us-ascii?q?BAQ?= X-IronPort-AV: E=Sophos;i="5.58,397,1544486400"; d="scan'208,217";a="525624780" Received: from rcdn-core-5.cisco.com ([173.37.93.156]) by rcdn-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 22 Feb 2019 01:41:53 +0000 Received: from XCH-RTP-020.cisco.com (xch-rtp-020.cisco.com [64.101.220.160]) by rcdn-core-5.cisco.com (8.15.2/8.15.2) with ESMTPS id x1M1fqMq018261 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=FAIL); Fri, 22 Feb 2019 01:41:53 GMT Received: from xch-rtp-020.cisco.com (64.101.220.160) by XCH-RTP-020.cisco.com (64.101.220.160) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Thu, 21 Feb 2019 20:41:52 -0500 Received: from xch-rtp-020.cisco.com ([64.101.220.160]) by XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1395.000; Thu, 21 Feb 2019 20:41:52 -0500 From: "Carlos Pignataro (cpignata)" To: "Andrew G. Malis" CC: "ops-dir@ietf.org" , mpls , "draft-ietf-mpls-sfc-encapsulation.all@ietf.org" , IETF Discussion , "sfc@ietf.org" Thread-Topic: [mpls] Opsdir last call review of draft-ietf-mpls-sfc-encapsulation-02 Thread-Index: AQHUyhBL6QxMzhBFbEuO+4PZE0wBEaXrX0GA Date: Fri, 22 Feb 2019 01:41:52 +0000 Message-ID: <6A97863A-DD90-4D62-9607-569386F5F850@cisco.com> References: <155072147698.20210.381511429964485828@ietfa.amsl.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: Apple Mail (2.3445.102.3) x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.118.116.133] Content-Type: multipart/alternative; boundary="_000_6A97863ADD904D629607569386F5F850ciscocom_" MIME-Version: 1.0 X-Outbound-SMTP-Client: 64.101.220.160, xch-rtp-020.cisco.com X-Outbound-Node: rcdn-core-5.cisco.com Archived-At: Subject: Re: [sfc] [mpls] Opsdir last call review of 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-0800 (PST) MIME-Version: 1.0 References: <155072147698.20210.381511429964485828@ietfa.amsl.com> <6A97863A-DD90-4D62-9607-569386F5F850@cisco.com> In-Reply-To: <6A97863A-DD90-4D62-9607-569386F5F850@cisco.com> From: "Andrew G. Malis" Date: Fri, 22 Feb 2019 09:27:41 -0500 Message-ID: To: "Carlos Pignataro (cpignata)" Cc: "ops-dir@ietf.org" , mpls , "draft-ietf-mpls-sfc-encapsulation.all@ietf.org" , IETF Discussion , "sfc@ietf.org" Content-Type: multipart/alternative; boundary="0000000000006bfb4005827c65f7" Archived-At: Subject: Re: [sfc] [mpls] Opsdir last call review of draft-ietf-mpls-sfc-encapsulation-02 X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 Feb 2019 14:27:58 -0000 --0000000000006bfb4005827c65f7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Carlos, Looks good on all but one point - I think I see why you're referencing GTSM, since packets at the SFC layer would generally be one hop away from each other at that layer. Is that correct? However, I really don't have sufficient experience with GTSM to craft specific text. If you think it's important enough to include, could you propose some text for me to include? Thanks again, Andy On Thu, Feb 21, 2019 at 8:41 PM Carlos Pignataro (cpignata) < cpignata@cisco.com> wrote: > Hi, Andy, > > On Feb 21, 2019, at 1:06 PM, Andrew G. Malis wrote: > > Carlos, > > Many thanks for your review! I'm also including the SFC WG on my reply. > > > Thanks for the quick response, and for considering the comments! > > I enjoyed reading this document =E2=80=94 please see below. > > > Comments inline. > > On Wed, Feb 20, 2019 at 10:58 PM Carlos Pignataro > wrote: > >> Reviewer: Carlos Pignataro >> Review result: Has Issues >> >> Reviewer: Carlos Pignataro >> Review Result: Has Issues >> >> I have reviewed this document as part of the Operational directorate's >> ongoing effort to review all IETF documents being processed by the IESG. >> These >> comments were written with the intent of improving the operational >> aspects of >> the IETF drafts. Comments that are not addressed in last call may be >> included >> in AD reviews during the IESG review. Document editors and WG chairs >> should >> treat these comments just like any other last call comments. >> >> This document is highly readable, includes very clear textual >> descriptions, and >> is very well organized. Easy to read in its simplicity. However, it woul= d >> benefit from a more explicit connection to the transport encap mechanics >> from >> RFC 8300 (e.g., S4, S6.1). Specifically, I'd recommend adding a Figure o= r >> an >> SFF NSH Mapping Table example, to depict and/or exemplify the SFF >> function. >> > > I'm trying to envision what would make a good figure here. We could add a= n > additional line to Table 1 of RFC 8300 and reference that table: > > +------+------+---------------------+-------------------------+ > > | SPI | SI | Next Hop(s) | Transport Encapsulation | > +------+------+---------------------+-------------------------+ > > | 25 | 220 | Label 5467 | MPLS | > > +------+------+---------------------+-------------------------+ > > > Is that what you had in mind? If not, I'm open to other suggestions. > > > If you think it helps, this would be a good addition. > > > >> >> >From an Operational standpoint, the document seems largely appropriate >> in terms >> of dataplane considerations. Some key considerations are explicitly out = of >> scope: >> The method used by the downstream receiving node to advertise SFF >> Labels to the upstream sending node is out of scope of this document. >> >> This really seems to mean that, with the simple definition in this >> Informational document, interoperable implementations cannot yet exist. = If >> there is no mechanism to advertise the SFF Label or to manage the >> semantics of >> this particular label, how will it know? Static configuration, which is >> not >> covered anyway, is not in my humble opinion a manageable scalable >> approach. >> > > Actually, while it is outside the scope of this document, it is within th= e > scope of draft-ietf-bess-nsh-bgp-control-plane, and text is being added t= o > the next revision of that draft to show how it can be used to signal the > encapsulation defined here. This was worked out after this draft was > forwarded to the IESG, but we can now add a reference to that draft seein= g > as we'll be doing a post-last-call update. > > > I think that will help, as an Informative =E2=80=9Cone embodiment=E2=80= =9D type of link. > > > >> >> Title: MPLS Encapsulation For The SFC NSH >> >> RFC 8300 makes an explicit distinction between the terms 'encapsulation' >> and >> 'transport encapsulation' (see e.g., Figure 1, Section 1.5 5., and >> Section 4 of >> RFC 8300). >> >> It seems to me that this is the "MPLS Transport Encapsulation for the SF= C >> NSH" >> > > Thanks, we'll fix that. > > >> >> 2. MPLS Encapsulation Using an SFF Label >> >> Similarly, "2. MPLS Transport Encapsulation Using an SFF Label" >> >> The encapsulation is a standard MPLS label stack [RFC3032] with an >> SFF Label at the bottom of the stack, followed by a NSH as defined by >> [RFC8300] and the NSH payload. >> >> Insteadf of "NSH payload" I think "orignal packet" is meant. >> > > RFC 8300 uses both "payload" and "original packet/frame", but the latter > more than the former. So we can change "payload" to "original packet/fram= e". > > >> >> Also, this encapsulation is Underdefined: What is the value of TTL? TC? >> > > I've been looking back at other related RFCs (such as PW and IP VPN label > definitions) and they're also mostly silent on these values. I did find t= he > following in RFC 6073: > > The setting of the TTL of the PW MPLS > label is a matter of local policy on the originating PE, but SHOULD > be set to 255. > > > Regarding the TC, we can follow the example of RFC 6391: > > This document does not define a use for the Traffic Class (TC) field > [RFC5462 ] (formerly known as the= Experimental Use (EXP) bits > [RFC3032 ]) in the flow label. F= uture documents may define a use for > these bits; therefore, implementations conforming to this > specification MUST set the TC field to zero at the ingress and MUST > ignore them at the egress. > > > Do you have any alternative suggestions? > > > These two approaches sounds good to me. And Ack to the other previous > responses. > > > >> >> Much like a pseudowire label, an SFF Label is allocated by the >> downstream receiver of the NSH from its per-platform label space. >> >> A PW Label is more restrictive. RFC 8077 says it MUST be allocated as >> per-platform: >> >> egress LSR only. Note that the PW label must always be at the bottom >> of the packet's label stack, and labels MUST be allocated from the >> per-platform label space. >> >> Is this the case for the SFF Label as well? If so, what is the >> implication of >> the MUST? If not, why is it different than other equivalent similar >> labels? >> > > We can change the text to: > > Much like a pseudowire label, an SFF Label MUST be allocated by the > downstream receiver of the NSH from its per-platform label space, since t= he > meaning of the label is identical independent of which incoming interface > it is received [RFC3031]. > > > That=E2=80=99s a great improvement. > > >> 2. Push the SFF Label to identify the desired SFF in the receiving >> MPLS node. >> >> TTL value? 1? 2? 255 for GTSM? GTSM RFC 5082 could be used here. >> > > As I noted above, 255, although I used RFC 6073 as my source rather than > 5082. We'll add that here as well. > > > Sounds good. > These protocols use 5082 in one form or another: > https://datatracker.ietf.org/doc/rfc5082/referencedby/ > > >> 4. Operations, Administration, and Maintenance (OAM) Considerations >> >> OAM at the SFC Layer is handled by SFC-defined mechanisms [RFC8300]. >> However, OAM may be required at the MPLS transport layer. If so, >> then standard MPLS-layer OAM mechanisms such as the Generic >> Associated Channel [RFC5586] label may be used. >> >> RFC 5586 is _not_ an OAM mechanism. It is an associated channel creation >> mechanism, over which OAM could be carried. >> >> Thus, what traditional MPLS OAM can be carried here? Things like RFC 437= 9 >> / RFC >> 8029 would need the definition of an SFF Label FEC (which does not exist= ). >> Which other one? IP/ICMP seems of very limited value. >> > > That's a good point about RFC 5586. The intention is that the MPLS OAM > would be at the transport label layer above the SFF label, so most any > MPLS-layer OAM would be applicable. So how about rewording to make that > more clear: > > OAM at the SFC Layer is handled by SFC-defined mechanisms [RFC8300]. > However, OAM may be required at the MPLS transport layer. If so, then > standard MPLS-layer OAM mechanisms may be used at the transport label lay= er > (the labels above the SFF label). > > > Looks good to me, thank you. > > > >> >> 6. Security Considerations >> >> Have you considered the use of GTSM? >> > > No, we hadn't. Can you point me to any examples of GTSM being used in an > MPLS or PW context? > > > Yes, see above. > > > >> >> 8. References >> >> [RFC7665] Halpern, J., Ed. and C. Pignataro, Ed., "Service Function >> Chaining (SFC) Architecture", RFC 7665, >> DOI 10.17487/RFC7665, October 2015, >> . >> >> SHould RFC 7665 be Normative? It defines the "SFF" which is quite centra= l >> to >> understanding this document. >> > > Good point. It was there because 7665 is an Informational RFC, but RFC > 8067 does allow normative references to informational RFCs, so I'll move = it. > > > > Thank you. > > >> Other Nits and Editorials: >> >> SFF Labels are similar to other service labels at the bottom of an >> MPLS label stack that denote the contents of the MPLS payload being >> other than IP, such as a layer 2 pseudowire, an IP packet that is >> routed in a VPN context with a private address, or an Ethernet >> virtual private wire service. >> >> This says "being other than IP, such as IP", which seems to be >> self-contradictory :-) >> >> :-) > > How about we change "other than IP," to "other than a normally routed IP > packet=E2=80=9D, > > > That would disambiguate it. > > Thanks again. > > To me, the control plane / advertisement was the most important > operationally-relevant comment. > > Thanks, > > Carlos. > > > Thanks again, > Andy > > > --0000000000006bfb4005827c65f7 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Carlos,

Looks good on all but one point= - I think I see why you're referencing GTSM,=C2=A0since packets at the= SFC layer would generally be one hop away from each other at that layer. I= s that correct? However, I really don't have sufficient experience with= GTSM to craft specific=C2=A0text. If you think it's important enough t= o include, could you propose some text for me to include?

Thanks again,
Andy


On Thu, Feb 21, 20= 19 at 8:41 PM Carlos Pignataro (cpignata) <cpignata@cisco.com> wrote:
Hi, Andy,

On Feb 21, 2019, at 1:06 PM, Andrew G. Malis <agmalis@gmail.com> wrote:

Carlos,

Many thanks for your review! I'm also including the SFC WG on my r= eply.

Thanks for the quick response, and for considering the comments!

I enjoyed reading this document =E2=80=94 please see below.


Comments inline.

On Wed, Feb 20, 2019 at 10:58 PM Carl= os Pignataro <cp= ignata@cisco.com> wrote:
Reviewer: Carlos Pignataro
Review result: Has Issues

Reviewer: Carlos Pignataro
Review Result: Has Issues

I have reviewed this document as part of the Operational directorate's<= br> ongoing effort to review all IETF documents being processed by the IESG.=C2= =A0 These
comments were written with the intent of improving the operational aspects = of
the IETF drafts. Comments that are not addressed in last call may be includ= ed
in AD reviews during the IESG review.=C2=A0 Document editors and WG chairs = should
treat these comments just like any other last call comments.

This document is highly readable, includes very clear textual descriptions,= and
is very well organized. Easy to read in its simplicity. However, it would benefit from a more explicit connection to the transport encap mechanics fr= om
RFC 8300 (e.g., S4, S6.1). Specifically, I'd recommend adding a Figure = or an
SFF NSH Mapping Table example, to depict and/or exemplify the SFF function.=

I'm trying to envision what would make a good figure here. We coul= d add an additional line to Table 1 of RFC 8300 and reference that table: 

      +------=
+------+---------------------+-------------------------+
      | SPI  =
| SI   | Next Hop(s)         | Transport Encapsulation |
      +------+------+---------------------+-------------------------+
      | 25   =
| 220  | Label 5467          | MPLS                    |
      +------=
+------+---------------------+-------------------------+

Is that what you had in mind? If not, I'm open to other suggestion= s.

If you think it helps, this would be a good addition.

=C2=A0

>From an Operational standpoint, the document seems largely appropriate = in terms
of dataplane considerations. Some key considerations are explicitly out of<= br> scope:
=C2=A0 =C2=A0The method used by the downstream receiving node to advertise = SFF
=C2=A0 =C2=A0Labels to the upstream sending node is out of scope of this do= cument.

This really seems to mean that, with the simple definition in this
Informational document, interoperable implementations cannot yet exist. If<= br> there is no mechanism to advertise the SFF Label or to manage the semantics= of
this particular label, how will it know? Static configuration, which is not=
covered anyway, is not in my humble opinion a manageable scalable approach.=

Actually, while it is outside the scope of this document, it is within= the scope of=C2=A0draft-ietf-bess-nsh-bgp-control-plane, and text is being= added to the next revision of that draft to show how it can be used to sig= nal the encapsulation defined here. This was worked out after this draft was forwarded to the IESG, but = we can now add a reference to that draft seeing as we'll be doing a pos= t-last-call update.

I think that will help, as an Informative =E2=80=9Cone embodiment=E2= =80=9D type of link.

=C2=A0

Title: MPLS Encapsulation For The SFC NSH

RFC 8300 makes an explicit distinction between the terms 'encapsulation= ' and
'transport encapsulation' (see e.g., Figure 1, Section 1.5 5., and = Section 4 of
RFC 8300).

It seems to me that this is the "MPLS Transport Encapsulation for the = SFC NSH"

Thanks, we'll fix that.
=C2=A0

2.=C2=A0 MPLS Encapsulation Using an SFF Label

Similarly, "2. MPLS Transport Encapsulation Using an SFF Label"
=C2=A0 =C2=A0The encapsulation is a standard MPLS label stack [RFC3032] wit= h an
=C2=A0 =C2=A0SFF Label at the bottom of the stack, followed by a NSH as def= ined by
=C2=A0 =C2=A0[RFC8300] and the NSH payload.

Insteadf of "NSH payload" I think "orignal packet" is m= eant.

RFC 8300 uses both "payload" and "original packet/frame= ", but the latter more than the former. So we can change "payload= " to "original packet/frame".
=C2=A0

Also, this encapsulation is Underdefined: What is the value of TTL? TC?

I've been looking back at other related RFCs (such as PW and IP VP= N label definitions) and they're also mostly silent on these values. I = did find the following in RFC 6073:

   The settin=
g of the TTL of the PW MPLS
   label is a matter of local policy on the originating PE, but SHOULD
   be set to 255.

Regarding the TC, we can follow the example of RFC 6391:

   This docum=
ent does not define a use for the Traffic Class (TC) field
   [R=
FC5462] (formerly known as the Experimental Use (EXP) bits
   [RFC3032]) in the flow label.=
  Future documents may define a use for
   these bits; therefore, implementations conforming to this
   specification MUST set the TC field to zero at the ingress and MUST
   ignore them at the egress.

Do you have any alternative suggestions?

These two approaches sounds good to me. And Ack to the other previous = responses.

=C2=A0

=C2=A0 =C2=A0Much like a pseudowire label, an SFF Label is allocated by the=
=C2=A0 =C2=A0downstream receiver of the NSH from its per-platform label spa= ce.

A PW Label is more restrictive. RFC 8077 says it MUST be allocated as
per-platform:

=C2=A0 =C2=A0egress LSR only.=C2=A0 Note that the PW label must always be a= t the bottom
=C2=A0 =C2=A0of the packet's label stack, and labels MUST be allocated = from the
=C2=A0 =C2=A0per-platform label space.

Is this the case for the SFF Label as well? If so, what is the implication = of
the MUST? If not, why is it different than other equivalent similar labels?=

We can change the text to:

=C2=A0Much like a pseudowire label, an SFF Label MUST be allocated by = the downstream receiver of the NSH from its per-platform label space, since= the meaning of the label is identical independent of which incoming interf= ace it is received [RFC3031].


That=E2=80=99s a great improvement.


=C2=A0 =C2=A02.=C2=A0 Push the SFF Label to identify the desired SFF in the= receiving
=C2=A0 =C2=A0 =C2=A0 =C2=A0MPLS node.

TTL value? 1? 2? 255 for GTSM? GTSM RFC 5082 could be used here.

As I noted above, 255, although I used RFC 6073 as my source rather th= an 5082. We'll add that here as well.


Sounds good.
These protocols use 5082 in one form or another:=C2=A0https:= //datatracker.ietf.org/doc/rfc5082/referencedby/


4.=C2=A0 Operations, Administration, and Maintenance (OAM) Considerations
=C2=A0 =C2=A0OAM at the SFC Layer is handled by SFC-defined mechanisms [RFC= 8300].
=C2=A0 =C2=A0However, OAM may be required at the MPLS transport layer.=C2= =A0 If so,
=C2=A0 =C2=A0then standard MPLS-layer OAM mechanisms such as the Generic =C2=A0 =C2=A0Associated Channel [RFC5586] label may be used.

RFC 5586 is _not_ an OAM mechanism. It is an associated channel creation mechanism, over which OAM could be carried.

Thus, what traditional MPLS OAM can be carried here? Things like RFC 4379 /= RFC
8029 would need the definition of an SFF Label FEC (which does not exist).<= br> Which other one? IP/ICMP seems of very limited value.

That's a good point about RFC 5586. The intention is that the MPLS= OAM would be at the transport label layer above the SFF label, so most any= MPLS-layer OAM would be applicable. So how about rewording to make that mo= re clear:

OAM at the SFC Layer is handled by SFC-defined mechanisms [RFC8300]. H= owever, OAM may be required at the MPLS transport layer.=C2=A0 If so, then = standard MPLS-layer OAM mechanisms may be used at the transport label layer= (the labels above the SFF label).

Looks good to me, thank you.

=C2=A0

6.=C2=A0 Security Considerations

Have you considered the use of GTSM?

No, we hadn't. Can you point me to any examples of GTSM being used= in an MPLS or PW context?

Yes, see above.

=C2=A0

8.=C2=A0 References

=C2=A0 =C2=A0[RFC7665]=C2=A0 Halpern, J., Ed. and C. Pignataro, Ed., "= Service Function
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Chaining (SFC) Architectur= e", RFC 7665,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 DOI 10.17487/RFC7665, Octo= ber 2015,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <https://= www.rfc-editor.org/info/rfc7665>.

SHould RFC 7665 be Normative? It defines the "SFF" which is quite= central to
understanding this document.

Good point. It was there because 7665 is an Informational RFC, but RFC= 8067 does allow normative references to informational RFCs, so I'll mo= ve it.
=C2=A0

Thank you.


Other Nits and Editorials:

=C2=A0 =C2=A0SFF Labels are similar to other service labels at the bottom o= f an
=C2=A0 =C2=A0MPLS label stack that denote the contents of the MPLS payload = being
=C2=A0 =C2=A0other than IP, such as a layer 2 pseudowire, an IP packet that= is
=C2=A0 =C2=A0routed in a VPN context with a private address, or an Ethernet=
=C2=A0 =C2=A0virtual private wire service.

This says "being other than IP, such as IP", which seems to be self-contradictory :-)

:-)

How about we change "other than IP," to "other than a n= ormally routed IP packet=E2=80=9D,

That would disambiguate it.

Thanks again.

To me, the control plane / advertisement was the most important operat= ionally-relevant comment.

Thanks,

Carlos.


Thanks again,
Andy

--0000000000006bfb4005827c65f7-- From nobody Fri Feb 22 07:40:10 2019 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 172CC130EC7 for ; Fri, 22 Feb 2019 07:39:59 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.301 X-Spam-Level: X-Spam-Status: No, score=-4.301 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=ericsson.com header.b=K6i+R0QS; dkim=fail (1024-bit key) reason="fail (body has been altered)" header.d=ericsson.com header.b=DE20JK3T 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 MaJAZu33H2Z9 for ; Fri, 22 Feb 2019 07:39:56 -0800 (PST) Received: from sesbmg23.ericsson.net (sesbmg23.ericsson.net [193.180.251.37]) (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 CB442130E7D for ; Fri, 22 Feb 2019 07:39:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; d=ericsson.com; s=mailgw201801; c=relaxed/relaxed; q=dns/txt; i=@ericsson.com; t=1550849989; x=1553441989; h=From:Sender:Reply-To:Subject:Date:Message-ID:To:CC:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=DjR0XNOT9wk/eK8f817dCnkkb/VW2GNEBt9cU7y41aE=; b=K6i+R0QS4XTBApm7iIdvjOGxWc3gucJdaXL9JevN79r6juhIcS1R9E9GOFSUEUTP /eAdMXjiQxDF0WmUEKzIc+RSLtANMT1rdi2sWRk+pIHShivbX2oiMo2PAo50PRTr gmWFj2K6Tdrf3QfVA95TDX3cyP6TWgsYNMY9RSE5SEU=; X-AuditID: c1b4fb25-209009e000005ff7-23-5c7017c511ad Received: from ESESBMB502.ericsson.se (Unknown_Domain [153.88.183.115]) by sesbmg23.ericsson.net (Symantec Mail Security) with SMTP id 04.42.24567.5C7107C5; Fri, 22 Feb 2019 16:39:49 +0100 (CET) Received: from ESESSMB503.ericsson.se (153.88.183.164) by ESESBMB502.ericsson.se (153.88.183.169) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1466.3; Fri, 22 Feb 2019 16:39:48 +0100 Received: from NAM05-CO1-obe.outbound.protection.outlook.com (153.88.183.157) by ESESSMB503.ericsson.se (153.88.183.164) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1466.3 via Frontend Transport; Fri, 22 Feb 2019 16:39:48 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ericsson.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=hPmzlGn+jw1nbA3vZ2gVBbXESzLbFkimt8uXFjP6M3g=; b=DE20JK3TZRTanJkcoO4xxqzfxl6E2ApD+WEys4G/rMnZID7bAb0+aIlArpNQQqTSz8yQyC+QjtxYEAoAOoo6qMIjYwTl62fNxQwFD8lvaA2pRL9htnwCH9eKr82AkujAq5LOE1CshuQKIfQyzTyw4Ra2lFSOVk9HqZZOhQx2JaY= Received: from BN6PR15MB1236.namprd15.prod.outlook.com (10.172.205.136) by BN6PR15MB1203.namprd15.prod.outlook.com (10.172.208.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1643.18; Fri, 22 Feb 2019 15:39:45 +0000 Received: from BN6PR15MB1236.namprd15.prod.outlook.com ([fe80::2ce1:745d:5907:30c1]) by BN6PR15MB1236.namprd15.prod.outlook.com ([fe80::2ce1:745d:5907:30c1%5]) with mapi id 15.20.1643.018; Fri, 22 Feb 2019 15:39:45 +0000 From: Joel Halpern To: "Andrew G. Malis" , "Carlos Pignataro (cpignata)" CC: "ops-dir@ietf.org" , mpls , "draft-ietf-mpls-sfc-encapsulation.all@ietf.org" , IETF Discussion , "sfc@ietf.org" Thread-Topic: [mpls] Opsdir last call review of draft-ietf-mpls-sfc-encapsulation-02 Thread-Index: AQHUyZmooeeOlrGJcEi/lzVg6owG5qXqjRuAgAB/QwCAANX3gIAAE8pQ Date: Fri, 22 Feb 2019 15:39:44 +0000 Message-ID: References: <155072147698.20210.381511429964485828@ietfa.amsl.com> <6A97863A-DD90-4D62-9607-569386F5F850@cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=joel.halpern@ericsson.com; x-originating-ip: [209.255.163.147] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 2d989364-92ae-43ff-1f80-08d698dbf864 x-microsoft-antispam: BCL:0; PCL:0; RULEID:(2390118)(7020095)(4652040)(8989299)(5600110)(711020)(4605104)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(2017052603328)(7153060)(49563074)(7193020); 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protocol="application/x-pkcs7-signature"; micalg=SHA1; boundary="----=_NextPart_000_0128_01D4CA9A.EBF1E560" MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: 2d989364-92ae-43ff-1f80-08d698dbf864 X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Feb 2019 15:39:44.9722 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 92e84ceb-fbfd-47ab-be52-080c6b87953f X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR15MB1203 X-OriginatorOrg: ericsson.com X-Brightmail-Tracker: H4sIAAAAAAAAA2WSfUhTURjGO/fe3V2txXFNfbP6o6kUVrNPGPRBRYQElpVZ5NBWXky0Kfda ZBCJtUrLUjPBhfODTcsyXCR+YIkri7YyS8o0S+dmTRJD6UuN1bY7Iei/3/s+z3ne8x4OQ0pz 6RAmRZPJchp1mpz2p0oPNPIrOoIzVCtd+lCl9bOFVk6MNVHKZrMRKT+Zyilln/GWSJmfYyCV jsEG8WZxVPG0SRTVrPsgjjIYJokY8qD/hiQ2LeUEy0VuOuR/9HxpF5ExpSVPGs9V09nobC+R h/wYwGuhpqRFlIf8GSl+jKCyY5AWih8I9NZRJBQGAvQ3r4g9BYULSDBd6CYFpZiAkWGHL2AI wUfbRZEnmcYKqPtqd09hGBlOhLeGRI+HxE4ETws7KY9nHt4HZVY96WEZjoNrdzsIgbfD4/O9 Xg+Fw8HuGvN6JFgFI7+bKGHYWQJ6c0toj+CHd8P11kfewwgHwU/LHS+TOBj6HOW+VWVge2Wl BQ6EEbtLJPhVkNPeJxL6oWCrLSAFXgSvyy8hgaPBUqInPIMB2xEUvTT4giLgwfNSsSAMzIOi snxfUiqUfZ3y8UIoybHSgqmehrYbw95YKWahpk6LCtBy3T+31XnfqRBB7tOXlM67dwA8K3W4 mXEL8WDqzxL8yyDfpkUzXF35hRQ4Al686RH/398ITsuAr78Yii/ZfLwOvnSMowo0uxYF8ix/ +Fjy6jUKlks5wvPpGoWGzbyH3J+y/f50eBPqHt1iRphB8jmSBlmGSipSn+CzjplRmDtnqP52 FwqhNOkaVi6TPHGlq6SSJHXWKZZLT+SOp7G8GS1gKHmw5Lc0QCXFyepMNpVlM1huRiUYv5Bs lLkucXhzUUJ8/2RP7LZl86t+hR/nJk3JDxMuR8ZUDM/dWrV+T/PPvbMetLYFHLo6PkQHBoUa VzgVylRVoVEmaVE4LQHvtkZ/02gb2/+0OIKeu3S271FnRmM7K9/vSEo4XZ5lnBtXtf8UVx3c ltdvn1rSYC4Im8hvW+oUdckmtLt2yin+qHpVBMnx6r+UhOBonAMAAA== Archived-At: Subject: Re: [sfc] [mpls] Opsdir last call review of draft-ietf-mpls-sfc-encapsulation-02 X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 Feb 2019 15:40:01 -0000 ------=_NextPart_000_0128_01D4CA9A.EBF1E560 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0129_01D4CA9A.EBF1E560" ------=_NextPart_001_0129_01D4CA9A.EBF1E560 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable More generally, I do not think there is a requirement that SFF be only = one MPLS-hop apart. So I tend to doubt whether a reference to GTSM will = be helpful. Maybe I am missing the applicability? Yours, Joel =20 From: Andrew G. Malis =20 Sent: Friday, February 22, 2019 9:28 AM To: Carlos Pignataro (cpignata) Cc: ops-dir@ietf.org; mpls ; = draft-ietf-mpls-sfc-encapsulation.all@ietf.org; IETF Discussion = ; sfc@ietf.org Subject: Re: [mpls] Opsdir last call review of = draft-ietf-mpls-sfc-encapsulation-02 =20 Carlos, =20 Looks good on all but one point - I think I see why you're referencing = GTSM, since packets at the SFC layer would generally be one hop away = from each other at that layer. Is that correct? However, I really don't = have sufficient experience with GTSM to craft specific text. If you = think it's important enough to include, could you propose some text for = me to include? =20 Thanks again, Andy =20 =20 On Thu, Feb 21, 2019 at 8:41 PM Carlos Pignataro (cpignata) = > wrote: Hi, Andy,=20 =20 On Feb 21, 2019, at 1:06 PM, Andrew G. Malis > wrote: =20 Carlos, =20 Many thanks for your review! I'm also including the SFC WG on my reply. =20 Thanks for the quick response, and for considering the comments! =20 I enjoyed reading this document =E2=80=94 please see below. =20 Comments inline. =20 On Wed, Feb 20, 2019 at 10:58 PM Carlos Pignataro > wrote: Reviewer: Carlos Pignataro Review result: Has Issues Reviewer: Carlos Pignataro Review Result: Has Issues I have reviewed this document as part of the Operational directorate's ongoing effort to review all IETF documents being processed by the IESG. = These comments were written with the intent of improving the operational = aspects of the IETF drafts. Comments that are not addressed in last call may be = included in AD reviews during the IESG review. Document editors and WG chairs = should treat these comments just like any other last call comments. This document is highly readable, includes very clear textual = descriptions, and is very well organized. Easy to read in its simplicity. However, it = would benefit from a more explicit connection to the transport encap mechanics = from RFC 8300 (e.g., S4, S6.1). Specifically, I'd recommend adding a Figure = or an SFF NSH Mapping Table example, to depict and/or exemplify the SFF = function. =20 I'm trying to envision what would make a good figure here. We could add = an additional line to Table 1 of RFC 8300 and reference that table: =20 +------+------+---------------------+-------------------------+ | SPI | SI | Next Hop(s) | Transport Encapsulation | +------+------+---------------------+-------------------------+ | 25 | 220 | Label 5467 | MPLS | +------+------+---------------------+-------------------------+ =20 Is that what you had in mind? If not, I'm open to other suggestions. =20 If you think it helps, this would be a good addition. =20 >From an Operational standpoint, the document seems largely appropriate = in terms of dataplane considerations. Some key considerations are explicitly out = of scope: The method used by the downstream receiving node to advertise SFF Labels to the upstream sending node is out of scope of this document. This really seems to mean that, with the simple definition in this Informational document, interoperable implementations cannot yet exist. = If there is no mechanism to advertise the SFF Label or to manage the = semantics of this particular label, how will it know? Static configuration, which is = not covered anyway, is not in my humble opinion a manageable scalable = approach. =20 Actually, while it is outside the scope of this document, it is within = the scope of draft-ietf-bess-nsh-bgp-control-plane, and text is being = added to the next revision of that draft to show how it can be used to = signal the encapsulation defined here. This was worked out after this = draft was forwarded to the IESG, but we can now add a reference to that = draft seeing as we'll be doing a post-last-call update. =20 I think that will help, as an Informative =E2=80=9Cone = embodiment=E2=80=9D type of link. =20 Title: MPLS Encapsulation For The SFC NSH RFC 8300 makes an explicit distinction between the terms 'encapsulation' = and 'transport encapsulation' (see e.g., Figure 1, Section 1.5 5., and = Section 4 of RFC 8300). It seems to me that this is the "MPLS Transport Encapsulation for the = SFC NSH" =20 Thanks, we'll fix that. =20 2. MPLS Encapsulation Using an SFF Label Similarly, "2. MPLS Transport Encapsulation Using an SFF Label" The encapsulation is a standard MPLS label stack [RFC3032] with an SFF Label at the bottom of the stack, followed by a NSH as defined by [RFC8300] and the NSH payload. Insteadf of "NSH payload" I think "orignal packet" is meant. =20 RFC 8300 uses both "payload" and "original packet/frame", but the latter = more than the former. So we can change "payload" to "original = packet/frame". =20 Also, this encapsulation is Underdefined: What is the value of TTL? TC? =20 I've been looking back at other related RFCs (such as PW and IP VPN = label definitions) and they're also mostly silent on these values. I did = find the following in RFC 6073: =20 The setting of the TTL of the PW MPLS label is a matter of local policy on the originating PE, but SHOULD be set to 255. =20 Regarding the TC, we can follow the example of RFC 6391: =20 This document does not define a use for the Traffic Class (TC) field [RFC5462 ] (formerly known as = the Experimental Use (EXP) bits [RFC3032 ]) in the flow label. = Future documents may define a use for these bits; therefore, implementations conforming to this specification MUST set the TC field to zero at the ingress and MUST ignore them at the egress. =20 Do you have any alternative suggestions? =20 These two approaches sounds good to me. And Ack to the other previous = responses. =20 Much like a pseudowire label, an SFF Label is allocated by the downstream receiver of the NSH from its per-platform label space. A PW Label is more restrictive. RFC 8077 says it MUST be allocated as per-platform: egress LSR only. Note that the PW label must always be at the bottom of the packet's label stack, and labels MUST be allocated from the per-platform label space. Is this the case for the SFF Label as well? If so, what is the = implication of the MUST? If not, why is it different than other equivalent similar = labels? =20 We can change the text to: =20 Much like a pseudowire label, an SFF Label MUST be allocated by the = downstream receiver of the NSH from its per-platform label space, since = the meaning of the label is identical independent of which incoming = interface it is received [RFC3031]. =20 =20 That=E2=80=99s a great improvement. 2. Push the SFF Label to identify the desired SFF in the receiving MPLS node. TTL value? 1? 2? 255 for GTSM? GTSM RFC 5082 could be used here. =20 As I noted above, 255, although I used RFC 6073 as my source rather than = 5082. We'll add that here as well. =20 =20 Sounds good. These protocols use 5082 in one form or another: = https://datatracker.ietf.org/doc/rfc5082/referencedby/ 4. Operations, Administration, and Maintenance (OAM) Considerations OAM at the SFC Layer is handled by SFC-defined mechanisms [RFC8300]. However, OAM may be required at the MPLS transport layer. If so, then standard MPLS-layer OAM mechanisms such as the Generic Associated Channel [RFC5586] label may be used. RFC 5586 is _not_ an OAM mechanism. It is an associated channel creation mechanism, over which OAM could be carried. Thus, what traditional MPLS OAM can be carried here? Things like RFC = 4379 / RFC 8029 would need the definition of an SFF Label FEC (which does not = exist). Which other one? IP/ICMP seems of very limited value. =20 That's a good point about RFC 5586. The intention is that the MPLS OAM = would be at the transport label layer above the SFF label, so most any = MPLS-layer OAM would be applicable. So how about rewording to make that = more clear: =20 OAM at the SFC Layer is handled by SFC-defined mechanisms [RFC8300]. = However, OAM may be required at the MPLS transport layer. If so, then = standard MPLS-layer OAM mechanisms may be used at the transport label = layer (the labels above the SFF label). =20 Looks good to me, thank you. =20 6. Security Considerations Have you considered the use of GTSM? =20 No, we hadn't. Can you point me to any examples of GTSM being used in an = MPLS or PW context? =20 Yes, see above. =20 8. References [RFC7665] Halpern, J., Ed. and C. Pignataro, Ed., "Service Function Chaining (SFC) Architecture", RFC 7665, DOI 10.17487/RFC7665, October 2015, . SHould RFC 7665 be Normative? It defines the "SFF" which is quite = central to understanding this document. =20 Good point. It was there because 7665 is an Informational RFC, but RFC = 8067 does allow normative references to informational RFCs, so I'll move = it. =20 =20 Thank you. Other Nits and Editorials: SFF Labels are similar to other service labels at the bottom of an MPLS label stack that denote the contents of the MPLS payload being other than IP, such as a layer 2 pseudowire, an IP packet that is routed in a VPN context with a private address, or an Ethernet virtual private wire service. This says "being other than IP, such as IP", which seems to be self-contradictory :-) :-) =20 How about we change "other than IP," to "other than a normally routed IP = packet=E2=80=9D, =20 That would disambiguate it. =20 Thanks again. =20 To me, the control plane / advertisement was the most important = operationally-relevant comment. =20 Thanks, =20 Carlos. =20 Thanks again, Andy =20 ------=_NextPart_001_0129_01D4CA9A.EBF1E560 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

More = generally, I do not think there is a requirement that SFF be only one = MPLS-hop apart.=C2=A0 So I tend to doubt whether a reference to GTSM = will be helpful. =C2=A0=C2=A0Maybe I am missing the = applicability?

Yours,

Joel

 

From: = Andrew G. Malis <agmalis@gmail.com>
Sent: Friday, = February 22, 2019 9:28 AM
To: Carlos Pignataro (cpignata) = <cpignata@cisco.com>
Cc: ops-dir@ietf.org; mpls = <mpls@ietf.org>; draft-ietf-mpls-sfc-encapsulation.all@ietf.org; = IETF Discussion <ietf@ietf.org>; sfc@ietf.org
Subject: = Re: [mpls] Opsdir last call review of = draft-ietf-mpls-sfc-encapsulation-02

 

Carlos,

 

Looks good on all but one point - I think I see why = you're referencing GTSM, since packets at the SFC layer would = generally be one hop away from each other at that layer. Is that = correct? However, I really don't have sufficient experience with GTSM to = craft specific text. If you think it's important enough to include, = could you propose some text for me to = include?

 

Thanks again,

Andy

 

 

On = Thu, Feb 21, 2019 at 8:41 PM Carlos Pignataro (cpignata) <cpignata@cisco.com> = wrote:

Hi, = Andy,

 

On Feb 21, 2019, at 1:06 PM, Andrew G. Malis <agmalis@gmail.com> = wrote:

 

Carlos,=

 <= /o:p>

Many thanks = for your review! I'm also including the SFC WG on my = reply.

 

Thanks for the quick response, and for considering the = comments!

 

I = enjoyed reading this document =E2=80=94 please see = below.



 <= /o:p>

Comments = inline.

 <= /o:p>

On Wed, Feb = 20, 2019 at 10:58 PM Carlos Pignataro <cpignata@cisco.com> = wrote:

Reviewer: = Carlos Pignataro
Review result: Has Issues

Reviewer: Carlos = Pignataro
Review Result: Has Issues

I have reviewed this = document as part of the Operational directorate's
ongoing effort to = review all IETF documents being processed by the IESG.  = These
comments were written with the intent of improving the = operational aspects of
the IETF drafts. Comments that are not = addressed in last call may be included
in AD reviews during the IESG = review.  Document editors and WG chairs should
treat these = comments just like any other last call comments.

This document is = highly readable, includes very clear textual descriptions, and
is = very well organized. Easy to read in its simplicity. However, it = would
benefit from a more explicit connection to the transport encap = mechanics from
RFC 8300 (e.g., S4, S6.1). Specifically, I'd recommend = adding a Figure or an
SFF NSH Mapping Table example, to depict and/or = exemplify the SFF function.

 <= /o:p>

I'm trying = to envision what would make a good figure here. We could add an = additional line to Table 1 of RFC 8300 and reference that = table:

 <= /o:p>

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
+------+------+---------------------+-------------------------+
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | =
SPI=C2=A0 | SI=C2=A0=C2=A0 | Next =
Hop(s)=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | Transport =
Encapsulation |
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
+------+------+---------------------+-------------------------+
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | =
25=C2=A0=C2=A0 | 220=C2=A0 | Label =
5467=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | =
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 =
+------+------+---------------------+-------------------------+

 <= /o:p>

Is that = what you had in mind? If not, I'm open to other = suggestions.

 

If you think it helps, this would be a good = addition.



<= p class=3DMsoNormal> <= /o:p>


>From= an Operational standpoint, the document seems largely appropriate in = terms
of dataplane considerations. Some key considerations are = explicitly out of
scope:
   The method used by the = downstream receiving node to advertise SFF
   Labels to the = upstream sending node is out of scope of this document.

This = really seems to mean that, with the simple definition in = this
Informational document, interoperable implementations cannot yet = exist. If
there is no mechanism to advertise the SFF Label or to = manage the semantics of
this particular label, how will it know? = Static configuration, which is not
covered anyway, is not in my = humble opinion a manageable scalable = approach.

 <= /o:p>

Actually, = while it is outside the scope of this document, it is within the scope = of draft-ietf-bess-nsh-bgp-control-plane, and text is being added = to the next revision of that draft to show how it can be used to signal = the encapsulation defined here. This was worked out after this draft was = forwarded to the IESG, but we can now add a reference to that draft = seeing as we'll be doing a post-last-call = update.

<= div>

 

I think that will help, as an Informative =E2=80=9Cone = embodiment=E2=80=9D type of link.



<= p class=3DMsoNormal> <= /o:p>


Title: = MPLS Encapsulation For The SFC NSH

RFC 8300 makes an explicit = distinction between the terms 'encapsulation' and
'transport = encapsulation' (see e.g., Figure 1, Section 1.5 5., and Section 4 = of
RFC 8300).

It seems to me that this is the "MPLS = Transport Encapsulation for the SFC = NSH"

 <= /o:p>

Thanks, = we'll fix that.

 <= /o:p>


2. = MPLS Encapsulation Using an SFF Label

Similarly, "2. MPLS = Transport Encapsulation Using an SFF Label"

   The = encapsulation is a standard MPLS label stack [RFC3032] with an
  =  SFF Label at the bottom of the stack, followed by a NSH as defined = by
   [RFC8300] and the NSH payload.

Insteadf of = "NSH payload" I think "orignal packet" is = meant.

 <= /o:p>

RFC 8300 = uses both "payload" and "original packet/frame", but = the latter more than the former. So we can change "payload" to = "original packet/frame".

 <= /o:p>


Also, = this encapsulation is Underdefined: What is the value of TTL? = TC?

 <= /o:p>

I've been = looking back at other related RFCs (such as PW and IP VPN label = definitions) and they're also mostly silent on these values. I did find = the following in RFC 6073:

 <= /o:p>

=C2=A0=C2=A0 =
The setting of the TTL of the PW MPLS
=C2=A0=C2=A0 =
label is a matter of local policy on the originating PE, but =
SHOULD
=C2=A0=C2=A0 be set to =
255.

 <= /o:p>

Regarding = the TC, we can follow the example of RFC = 6391:

 <= /o:p>

=C2=A0=C2=A0 =
This document does not define a use for the Traffic Class (TC) =
field
=C2=A0=C2=A0 [RFC5462] (formerly known as the Experimental Use (EXP) =
bits
=C2=A0=C2=A0 [RFC3032]) in the =
flow label.=C2=A0 Future documents may define a use =
for
=C2=A0=C2=A0 these bits; therefore, =
implementations conforming to this
=C2=A0=C2=A0 =
specification MUST set the TC field to zero at the ingress and =
MUST
=C2=A0=C2=A0 ignore them at the =
egress.

 <= /o:p>

Do you have = any alternative = suggestions?

 

These two approaches sounds good to me. And Ack to the = other previous responses.



<= p class=3DMsoNormal> <= /o:p>


  =  Much like a pseudowire label, an SFF Label is allocated by = the
   downstream receiver of the NSH from its per-platform = label space.

A PW Label is more restrictive. RFC 8077 says it = MUST be allocated as
per-platform:

   egress LSR = only.  Note that the PW label must always be at the = bottom
   of the packet's label stack, and labels MUST be = allocated from the
   per-platform label space.

Is = this the case for the SFF Label as well? If so, what is the implication = of
the MUST? If not, why is it different than other equivalent = similar labels?

 <= /o:p>

We can = change the text to:

 <= /o:p>

 Much = like a pseudowire label, an SFF Label MUST be allocated by the = downstream receiver of the NSH from its per-platform label space, since = the meaning of the label is identical independent of which incoming = interface it is received [RFC3031].

 <= /o:p>

 

That=E2=80=99s a great = improvement.




  =  2.  Push the SFF Label to identify the desired SFF in the = receiving
       MPLS node.

TTL value? 1? = 2? 255 for GTSM? GTSM RFC 5082 could be used = here.

 <= /o:p>

As I noted = above, 255, although I used RFC 6073 as my source rather than 5082. = We'll add that here as well.

 <= /o:p>

 

Sounds good.

These protocols use 5082 in one form or = another: https://datatracker.ietf.org/doc/rfc5082/referencedby/<= /a>



<= div>

 

Looks good to me, thank = you.




8. = References

   [RFC7665]  Halpern, J., Ed. and C. = Pignataro, Ed., "Service Function
        =       Chaining (SFC) Architecture", RFC = 7665,
              DOI = 10.17487/RFC7665, October 2015,
          =     <https://www.rfc-editor.org/info/rfc7665>.
SHould RFC 7665 be Normative? It defines the "SFF" which is = quite central to
understanding this = document.

 <= /o:p>

Good point. = It was there because 7665 is an Informational RFC, but RFC 8067 does = allow normative references to informational RFCs, so I'll move = it.

 <= /o:p>

 

Thank = you.




Other = Nits and Editorials:

   SFF Labels are similar to other = service labels at the bottom of an
   MPLS label stack that = denote the contents of the MPLS payload being
   other than = IP, such as a layer 2 pseudowire, an IP packet that is
  =  routed in a VPN context with a private address, or an = Ethernet
   virtual private wire service.

This says = "being other than IP, such as IP", which seems to = be
self-contradictory :-)

:-)

 <= /o:p>

How about = we change "other than IP," to "other than a normally = routed IP = packet=E2=80=9D,

 

That would disambiguate = it.

 

Thanks again.

 

To me, the control plane / advertisement was the most = important operationally-relevant comment.

 

Thanks,

 

Carlos.



<= p class=3DMsoNormal> <= /o:p>

Thanks = again,

Andy

 

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from localhost (localhost [127.0.0.1]) by maila2.tigertech.net (Postfix) with ESMTP id 445cbv0LRgzZs6Z; Fri, 22 Feb 2019 08:43:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=2.tigertech; t=1550853819; bh=kjuMZqpGXP0kS5zroOd1LrNlFR4hd2ZlF5zx0BhRkvk=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=a+4dfDy6CNo2jjbU7q3U85gqQcMRhq9j0dxqc7jGJEt54crocdZU/pXLdk8OCOLJN C7vatIqxJ+j7oMdQNavV7yUAEtQ39L6J9ClqhNbQBCXqg3kAoTokl4OStVwGljx208 Y9hXYLWGvZqWqpXsBjTqqk4gv+ZCOL4y2BwALlwA= X-Virus-Scanned: Debian amavisd-new at maila2.tigertech.net Received: from Joels-MacBook-Pro.local (209-255-163-147.ip.mcleodusa.net [209.255.163.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 445cbs5FDMzKnJL; Fri, 22 Feb 2019 08:43:37 -0800 (PST) To: "Andrew G. Malis" , "Carlos Pignataro (cpignata)" Cc: mpls , "ops-dir@ietf.org" , "draft-ietf-mpls-sfc-encapsulation.all@ietf.org" , IETF Discussion , "sfc@ietf.org" References: <155072147698.20210.381511429964485828@ietfa.amsl.com> <6A97863A-DD90-4D62-9607-569386F5F850@cisco.com> From: "Joel M. Halpern" Message-ID: <03769b15-8375-a23a-a882-0a183056a8b5@joelhalpern.com> Date: Fri, 22 Feb 2019 11:43:36 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [sfc] [mpls] Opsdir last call review of draft-ietf-mpls-sfc-encapsulation-02 X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 Feb 2019 16:43:44 -0000 My comment on this may not have made it to everyone. If you receive a duplicate, I apologize (I received DMARC errors from something about translations from the draft.all address to gmail addresses.) Speaking as a co-author... It is not at all clear to me that GTSM applies or how it would apply. There is no requirement that successive SFF be one MPLS hop apart. Yours, Joel On 2/22/19 9:27 AM, Andrew G. Malis wrote: > Carlos, > > Looks good on all but one point - I think I see why you're referencing > GTSM, since packets at the SFC layer would generally be one hop away > from each other at that layer. Is that correct? However, I really don't > have sufficient experience with GTSM to craft specific text. If you > think it's important enough to include, could you propose some text for > me to include? > > Thanks again, > Andy > > > On Thu, Feb 21, 2019 at 8:41 PM Carlos Pignataro (cpignata) > > wrote: > > Hi, Andy, > >> On Feb 21, 2019, at 1:06 PM, Andrew G. Malis > > wrote: >> >> Carlos, >> >> Many thanks for your review! I'm also including the SFC WG on my >> reply. > > Thanks for the quick response, and for considering the comments! > > I enjoyed reading this document — please see below. > >> >> Comments inline. >> >> On Wed, Feb 20, 2019 at 10:58 PM Carlos Pignataro >> > wrote: >> >> Reviewer: Carlos Pignataro >> Review result: Has Issues >> >> Reviewer: Carlos Pignataro >> Review Result: Has Issues >> >> I have reviewed this document as part of the Operational >> directorate's >> ongoing effort to review all IETF documents being processed by >> the IESG.  These >> comments were written with the intent of improving the >> operational aspects of >> the IETF drafts. Comments that are not addressed in last call >> may be included >> in AD reviews during the IESG review.  Document editors and WG >> chairs should >> treat these comments just like any other last call comments. >> >> This document is highly readable, includes very clear textual >> descriptions, and >> is very well organized. Easy to read in its simplicity. >> However, it would >> benefit from a more explicit connection to the transport encap >> mechanics from >> RFC 8300 (e.g., S4, S6.1). Specifically, I'd recommend adding >> a Figure or an >> SFF NSH Mapping Table example, to depict and/or exemplify the >> SFF function. >> >> >> I'm trying to envision what would make a good figure here. We >> could add an additional line to Table 1 of RFC 8300 and reference >> that table: >> >> +------+------+---------------------+-------------------------+ >> | SPI | SI | Next Hop(s) | Transport Encapsulation | >> +------+------+---------------------+-------------------------+ >> | 25 | 220 | Label 5467 | MPLS | >> +------+------+---------------------+-------------------------+ >> >> Is that what you had in mind? If not, I'm open to other suggestions. > > If you think it helps, this would be a good addition. > >> >> >From an Operational standpoint, the document seems largely >> appropriate in terms >> of dataplane considerations. Some key considerations are >> explicitly out of >> scope: >>    The method used by the downstream receiving node to >> advertise SFF >>    Labels to the upstream sending node is out of scope of this >> document. >> >> This really seems to mean that, with the simple definition in this >> Informational document, interoperable implementations cannot >> yet exist. If >> there is no mechanism to advertise the SFF Label or to manage >> the semantics of >> this particular label, how will it know? Static configuration, >> which is not >> covered anyway, is not in my humble opinion a manageable >> scalable approach. >> >> >> Actually, while it is outside the scope of this document, it is >> within the scope of draft-ietf-bess-nsh-bgp-control-plane, and >> text is being added to the next revision of that draft to show how >> it can be used to signal the encapsulation defined here. This was >> worked out after this draft was forwarded to the IESG, but we can >> now add a reference to that draft seeing as we'll be doing a >> post-last-call update. > > I think that will help, as an Informative “one embodiment” type of link. > >> >> Title: MPLS Encapsulation For The SFC NSH >> >> RFC 8300 makes an explicit distinction between the terms >> 'encapsulation' and >> 'transport encapsulation' (see e.g., Figure 1, Section 1.5 5., >> and Section 4 of >> RFC 8300). >> >> It seems to me that this is the "MPLS Transport Encapsulation >> for the SFC NSH" >> >> >> Thanks, we'll fix that. >> >> >> 2.  MPLS Encapsulation Using an SFF Label >> >> Similarly, "2. MPLS Transport Encapsulation Using an SFF Label" >> >>    The encapsulation is a standard MPLS label stack [RFC3032] >> with an >>    SFF Label at the bottom of the stack, followed by a NSH as >> defined by >>    [RFC8300] and the NSH payload. >> >> Insteadf of "NSH payload" I think "orignal packet" is meant. >> >> >> RFC 8300 uses both "payload" and "original packet/frame", but the >> latter more than the former. So we can change "payload" to >> "original packet/frame". >> >> >> Also, this encapsulation is Underdefined: What is the value of >> TTL? TC? >> >> >> I've been looking back at other related RFCs (such as PW and IP >> VPN label definitions) and they're also mostly silent on these >> values. I did find the following in RFC 6073: >> >> The setting of the TTL of the PW MPLS >> label is a matter of local policy on the originating PE, but SHOULD >> be set to 255. >> >> Regarding the TC, we can follow the example of RFC 6391: >> >> This document does not define a use for the Traffic Class (TC) field >> [RFC5462 ] (formerly known as the Experimental Use (EXP) bits >> [RFC3032 ]) in the flow label. Future documents may define a use for >> these bits; therefore, implementations conforming to this >> specification MUST set the TC field to zero at the ingress and MUST >> ignore them at the egress. >> >> Do you have any alternative suggestions? > > These two approaches sounds good to me. And Ack to the other > previous responses. > >> >>    Much like a pseudowire label, an SFF Label is allocated by the >>    downstream receiver of the NSH from its per-platform label >> space. >> >> A PW Label is more restrictive. RFC 8077 says it MUST be >> allocated as >> per-platform: >> >>    egress LSR only.  Note that the PW label must always be at >> the bottom >>    of the packet's label stack, and labels MUST be allocated >> from the >>    per-platform label space. >> >> Is this the case for the SFF Label as well? If so, what is the >> implication of >> the MUST? If not, why is it different than other equivalent >> similar labels? >> >> >> We can change the text to: >> >>  Much like a pseudowire label, an SFF Label MUST be allocated by >> the downstream receiver of the NSH from its per-platform label >> space, since the meaning of the label is identical independent of >> which incoming interface it is received [RFC3031]. >> > > That’s a great improvement. > >> >>    2.  Push the SFF Label to identify the desired SFF in the >> receiving >>        MPLS node. >> >> TTL value? 1? 2? 255 for GTSM? GTSM RFC 5082 could be used here. >> >> >> As I noted above, 255, although I used RFC 6073 as my source >> rather than 5082. We'll add that here as well. >> > > Sounds good. > These protocols use 5082 in one form or another: > https://datatracker.ietf.org/doc/rfc5082/referencedby/ > >> >> 4.  Operations, Administration, and Maintenance (OAM) >> Considerations >> >>    OAM at the SFC Layer is handled by SFC-defined mechanisms >> [RFC8300]. >>    However, OAM may be required at the MPLS transport layer. >> If so, >>    then standard MPLS-layer OAM mechanisms such as the Generic >>    Associated Channel [RFC5586] label may be used. >> >> RFC 5586 is _not_ an OAM mechanism. It is an associated >> channel creation >> mechanism, over which OAM could be carried. >> >> Thus, what traditional MPLS OAM can be carried here? Things >> like RFC 4379 / RFC >> 8029 would need the definition of an SFF Label FEC (which does >> not exist). >> Which other one? IP/ICMP seems of very limited value. >> >> >> That's a good point about RFC 5586. The intention is that the MPLS >> OAM would be at the transport label layer above the SFF label, so >> most any MPLS-layer OAM would be applicable. So how about >> rewording to make that more clear: >> >> OAM at the SFC Layer is handled by SFC-defined mechanisms >> [RFC8300]. However, OAM may be required at the MPLS transport >> layer.  If so, then standard MPLS-layer OAM mechanisms may be used >> at the transport label layer (the labels above the SFF label). > > Looks good to me, thank you. > >> >> >> 6.  Security Considerations >> >> Have you considered the use of GTSM? >> >> >> No, we hadn't. Can you point me to any examples of GTSM being used >> in an MPLS or PW context? > > Yes, see above. > >> >> 8.  References >> >>    [RFC7665]  Halpern, J., Ed. and C. Pignataro, Ed., "Service >> Function >>               Chaining (SFC) Architecture", RFC 7665, >>               DOI 10.17487/RFC7665, October 2015, >>               > >. >> >> SHould RFC 7665 be Normative? It defines the "SFF" which is >> quite central to >> understanding this document. >> >> >> Good point. It was there because 7665 is an Informational RFC, but >> RFC 8067 does allow normative references to informational RFCs, so >> I'll move it. > > Thank you. > >> >> Other Nits and Editorials: >> >>    SFF Labels are similar to other service labels at the >> bottom of an >>    MPLS label stack that denote the contents of the MPLS >> payload being >>    other than IP, such as a layer 2 pseudowire, an IP packet >> that is >>    routed in a VPN context with a private address, or an Ethernet >>    virtual private wire service. >> >> This says "being other than IP, such as IP", which seems to be >> self-contradictory :-) >> >> :-) >> >> How about we change "other than IP," to "other than a normally >> routed IP packet”, > > That would disambiguate it. > > Thanks again. > > To me, the control plane / advertisement was the most important > operationally-relevant comment. > > Thanks, > > Carlos. > >> >> Thanks again, >> Andy > From nobody Sun Feb 24 20:50:08 2019 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 8B8C7130DD3; Sun, 24 Feb 2019 20:49:47 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.5 X-Spam-Level: X-Spam-Status: No, score=-14.5 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, 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, URIBL_BLOCKED=0.001, 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 CCYYLwV9ZlNb; Sun, 24 Feb 2019 20:49:44 -0800 (PST) Received: from alln-iport-3.cisco.com (alln-iport-3.cisco.com [173.37.142.90]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4AD1512D4E7; Sun, 24 Feb 2019 20:49:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=48880; q=dns/txt; s=iport; t=1551070184; x=1552279784; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=LFyI5QHXApXrNzpkdLFsI7IxDyM6qMaIVBJ09f4OjTA=; b=Vv74iAumM/2ygCDSb/FXkKNP8UJEkWrQqXayJkZC0G6pP51KEfmM5ZcB VTGmHXo8dpQ6tIGxQDnkUujBz6RVFt7rtiqBejRTlXLOEkt9RFeAfpKbb bDHa57CMJGm7s835mOp5M8hFVHybYSzG56ciIDvDu+GapaHH/7oNoRI41 8=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0ADAACycnNc/5pdJa1bChkBAQEBAQE?= =?us-ascii?q?BAQEBAQEHAQEBAQEBgVEEAQEBAQELAYENTCpngQMnCoN+iBqXEY5xgXsLAQE?= =?us-ascii?q?jhEkCF4NnIjQJDQEDAQECAQECbRwMhUsGI0QSEAIBCBImAQYDAgICHxEUAw4?= =?us-ascii?q?CBA4FgyABgQ5MAxUPqlOBL4RDQYJ0DYIZBYxIF4FAP4ERJx+CTIJXRwEBAwG?= =?us-ascii?q?BMgQmgwsxgiYCigkDB4F+KYN9hxuLMgUkMwkChz+DM4Q1gz0ZgXGFW4NDhGa?= =?us-ascii?q?DHotlhECBLogngmwCERSBKB84gVZwFRpLAYINATM+gWoFEoEAAQiHVoU/QTG?= =?us-ascii?q?NPoEugR8BAQ?= X-IronPort-AV: E=Sophos;i="5.58,410,1544486400"; d="scan'208,217";a="241860934" Received: from rcdn-core-3.cisco.com ([173.37.93.154]) by alln-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 25 Feb 2019 04:49:43 +0000 Received: from XCH-RTP-017.cisco.com (xch-rtp-017.cisco.com [64.101.220.157]) by rcdn-core-3.cisco.com (8.15.2/8.15.2) with ESMTPS id x1P4ngP3022994 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=FAIL); Mon, 25 Feb 2019 04:49:42 GMT Received: from xch-rtp-020.cisco.com (64.101.220.160) by XCH-RTP-017.cisco.com (64.101.220.157) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Sun, 24 Feb 2019 23:49:41 -0500 Received: from xch-rtp-020.cisco.com ([64.101.220.160]) by XCH-RTP-020.cisco.com ([64.101.220.160]) with mapi id 15.00.1395.000; Sun, 24 Feb 2019 23:49:41 -0500 From: "Carlos Pignataro (cpignata)" To: "Andrew G. Malis" CC: "ops-dir@ietf.org" , mpls , "draft-ietf-mpls-sfc-encapsulation.all@ietf.org" , IETF Discussion , "sfc@ietf.org" Thread-Topic: [mpls] Opsdir last call review of draft-ietf-mpls-sfc-encapsulation-02 Thread-Index: AQHUyhBL6QxMzhBFbEuO+4PZE0wBEaXrX0GAgADV+YCABBV+gA== Date: Mon, 25 Feb 2019 04:49:41 +0000 Message-ID: <7CB3E446-C745-42B4-A6A0-31028E1569C3@cisco.com> References: <155072147698.20210.381511429964485828@ietfa.amsl.com> <6A97863A-DD90-4D62-9607-569386F5F850@cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: Apple Mail (2.3445.102.3) x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.70.231.8] Content-Type: multipart/alternative; boundary="_000_7CB3E446C74542B4A6A031028E1569C3ciscocom_" MIME-Version: 1.0 X-Outbound-SMTP-Client: 64.101.220.157, xch-rtp-017.cisco.com X-Outbound-Node: rcdn-core-3.cisco.com Archived-At: Subject: Re: [sfc] [mpls] Opsdir last call review of draft-ietf-mpls-sfc-encapsulation-02 X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 25 Feb 2019 04:49:48 -0000 --_000_7CB3E446C74542B4A6A031028E1569C3ciscocom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 VGhhbmtzIEFuZHkhDQoNCllvdSBjYW4gZmluZCBzb21lIHByb3RvY29scyB1c2luZyBHVFNNIGF0 IGh0dHBzOi8vZGF0YXRyYWNrZXIuaWV0Zi5vcmcvZG9jL3JmYzUwODIvcmVmZXJlbmNlZGJ5Lywg aW5jbHVkaW5nIHJmYzY3MjAsIHJmYzczMjUsIHJmYzc4ODUsIGFuZCBvdGhlcnMuDQoNClRvIG1l LCBzcGVjaWZ5aW5nIHRoZSBUVEwgYmVoYXZpb3IgZWFybHkgb24gaXMgY3JpdGljYWwgdG8gbWFr ZSB1c2Ugb2YgaXQgYmVmb3JlIHZhcmlvdXMgaW1wbGVtZW50YXRpb25zIHVzZSBpbmNvbXBhdGli bGUgdmFsdWVzLiBGb3IgZXhhbXBsZSwgZWl0aGVyIHVzaW5nIDI1NSBmb3IgR1RTTSwgb3IgdXNp bmcgMSBvciBzaW1pbGFyIHRvIGVuc3VyZSB0aGVyZeKAmXMgbm8gbWlzLWZvcndhcmRpbmcsIGFy 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Malis" , mpls , "ops-dir@ietf.org" , "draft-ietf-mpls-sfc-encapsulation.all@ietf.org" , IETF Discussion , "sfc@ietf.org" Thread-Topic: [mpls] Opsdir last call review of draft-ietf-mpls-sfc-encapsulation-02 Thread-Index: AQHUyhBL6QxMzhBFbEuO+4PZE0wBEaXrX0GAgADV+YCAACX5AIAD8MoA Date: Mon, 25 Feb 2019 04:54:13 +0000 Message-ID: <7CA6EE6E-3D6C-4ACF-B9B4-540C57A658E8@cisco.com> References: <155072147698.20210.381511429964485828@ietfa.amsl.com> <6A97863A-DD90-4D62-9607-569386F5F850@cisco.com> <03769b15-8375-a23a-a882-0a183056a8b5@joelhalpern.com> In-Reply-To: <03769b15-8375-a23a-a882-0a183056a8b5@joelhalpern.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: Apple Mail (2.3445.102.3) x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.70.231.8] Content-Type: multipart/alternative; boundary="_000_7CA6EE6E3D6C4ACFB9B4540C57A658E8ciscocom_" MIME-Version: 1.0 X-Outbound-SMTP-Client: 64.101.220.158, xch-rtp-018.cisco.com X-Outbound-Node: rcdn-core-4.cisco.com Archived-At: Subject: Re: [sfc] [mpls] Opsdir last call review of draft-ietf-mpls-sfc-encapsulation-02 X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 25 Feb 2019 04:54:21 -0000 --_000_7CA6EE6E3D6C4ACFB9B4540C57A658E8ciscocom_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGksIEpvZWwsDQoNCk1heWJlIEkgYW0gbWlzdW5kZXJzdGFuZGluZyBzb21ldGhpbmcuIElzIHRo ZSBTRkYgTGFiZWwsIGluIHRoZSBjb250ZXh0IG9mIE1QTFMgdHJhbnNwb3J0IGVuY2Fwc3VsYXRp b24gZm9yIHRoZSBTRkMgTlNILCBldmVyIGV4cGVjdGVkIHRvIGJlIHVzZWQgZm9yIEZvcndhcmRp bmc/IElzIGl0cyBUVEwgZXZlciBleHBlY3RlZCB0byBiZSBkZWNyZW1lbnRlZCBhbmQgdGhlIHBh Y2tldCBzZW50PyBJZiBzbywgSSBkaWQgbm90IHVuZGVyc3RhbmQgdGhhdCBmcm9tIHRoZSBleGlz dGluZyB0ZXh0LCBzaW5jZSBpdCBpcyBlcXVpdmFsZW50IHRvIGEgUFcgTGFiZWwuIElmIG5vdCwg 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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 0cK4PFIs-6XJ; Mon, 25 Feb 2019 04:32:51 -0800 (PST) Received: from maila2.tigertech.net (maila2.tigertech.net [208.80.4.152]) (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 20AFB130EEC; Mon, 25 Feb 2019 04:32:51 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by maila2.tigertech.net (Postfix) with ESMTP id 447Lv6744czKnSN; Mon, 25 Feb 2019 04:32:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=2.tigertech; t=1551097971; bh=lzCTTVgnlaQEb/ojim+tQ2J9xDqlQvMn5RQMB5lbHe4=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=UGYONqKAhv+7bihth6TrWbglwvKfIN7t2zU+tny5Qvwx+YV0lF23+Y7YbBkDumUI7 AMQvMx4luJwehPYQe5DKmNG2CJ4RRsLlrrZViRxU5aLx5MajOZp83jejZezhuQMTHh WmbRx0qZ1+b3S+R9i9N0iGOv8JoXxj2PpnY+PzOI= X-Virus-Scanned: Debian amavisd-new at maila2.tigertech.net Received: from Joels-MacBook-Pro.local (209-255-163-147.ip.mcleodusa.net [209.255.163.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by maila2.tigertech.net (Postfix) with ESMTPSA id 447Lv54xP7zW036; Mon, 25 Feb 2019 04:32:49 -0800 (PST) To: "Carlos Pignataro (cpignata)" Cc: "Andrew G. Malis" , mpls , "ops-dir@ietf.org" , "draft-ietf-mpls-sfc-encapsulation.all@ietf.org" , IETF Discussion , "sfc@ietf.org" References: <155072147698.20210.381511429964485828@ietfa.amsl.com> <6A97863A-DD90-4D62-9607-569386F5F850@cisco.com> <03769b15-8375-a23a-a882-0a183056a8b5@joelhalpern.com> <7CA6EE6E-3D6C-4ACF-B9B4-540C57A658E8@cisco.com> From: "Joel M. Halpern" Message-ID: <992f87f7-f9bd-b5f5-1bf1-2b1f7e1eed08@joelhalpern.com> Date: Mon, 25 Feb 2019 07:32:48 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 In-Reply-To: <7CA6EE6E-3D6C-4ACF-B9B4-540C57A658E8@cisco.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [sfc] [mpls] Opsdir last call review of draft-ietf-mpls-sfc-encapsulation-02 X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 25 Feb 2019 12:32:55 -0000 First, you have a good point that the expected behavior of the MPLS TTL shoudl be specified. Given that we managed to confuse you, it needs to be fixed. As I understand it, the MPLS TTL used for transport between SFF and the NSH TTL used for the SFC SFP are unrelated. The NSH TTL has a value that exceeds the number of expected SFF (with a default of 63.) It is derement at each SFF. The MPLS TTL needs to be set to a value sufficient to get the NSH packet from one SFF to the next. That might be one MPLS hop. It might be several. Presumably therefore the default is whatever the default is for the MPLS network in which it is being used. the important point is that there is no relationship between decrements to the MPLS TTL and decrements to the NSH TTL. As in tunnel mode for IP in IP tunnels, the NSH TTL is only decrement by one for each SFF-SFF hop. Yours, Joel On 2/24/19 11:54 PM, Carlos Pignataro (cpignata) wrote: > Hi, Joel, > > Maybe I am misunderstanding something. Is the SFF Label, in the context > of MPLS transport encapsulation for the SFC NSH, ever expected to be > used for Forwarding? Is its TTL ever expected to be decremented and the > packet sent? If so, I did not understand that from the existing text, > since it is equivalent to a PW Label. If not, we can take advantage of TTL. > > Either way is good, I’m just asking to make this explicit. > > Thanks, > > — Carlos Pignataro > >> On Feb 23, 2019, at 1:43 AM, Joel M. Halpern > > wrote: >> >> My comment on this may not have made it to everyone.  If you receive a >> duplicate, I apologize  (I received DMARC errors from something about >> translations from the draft.all address to gmail addresses.) >> >> Speaking as a co-author... >> >> It is not at all clear to me that GTSM applies or how it would apply. >> There is no requirement that successive SFF be one MPLS hop apart. >> >> Yours, >> Joel >> >> On 2/22/19 9:27 AM, Andrew G. Malis wrote: >>> Carlos, >>> Looks good on all but one point - I think I see why you're >>> referencing GTSM, since packets at the SFC layer would generally be >>> one hop away from each other at that layer. Is that correct? However, >>> I really don't have sufficient experience with GTSM to craft >>> specific text. If you think it's important enough to include, could >>> you propose some text for me to include? >>> Thanks again, >>> Andy >>> On Thu, Feb 21, 2019 at 8:41 PM Carlos Pignataro (cpignata) >>> >>> > wrote: >>>    Hi, Andy, >>>>    On Feb 21, 2019, at 1:06 PM, Andrew G. Malis >>> >>>>    > wrote: >>>> >>>>    Carlos, >>>> >>>>    Many thanks for your review! I'm also including the SFC WG on my >>>>    reply. >>>    Thanks for the quick response, and for considering the comments! >>>    I enjoyed reading this document — please see below. >>>> >>>>    Comments inline. >>>> >>>>    On Wed, Feb 20, 2019 at 10:58 PM Carlos Pignataro >>>>     >>>> > wrote: >>>> >>>>        Reviewer: Carlos Pignataro >>>>        Review result: Has Issues >>>> >>>>        Reviewer: Carlos Pignataro >>>>        Review Result: Has Issues >>>> >>>>        I have reviewed this document as part of the Operational >>>>        directorate's >>>>        ongoing effort to review all IETF documents being processed by >>>>        the IESG.  These >>>>        comments were written with the intent of improving the >>>>        operational aspects of >>>>        the IETF drafts. Comments that are not addressed in last call >>>>        may be included >>>>        in AD reviews during the IESG review.  Document editors and WG >>>>        chairs should >>>>        treat these comments just like any other last call comments. >>>> >>>>        This document is highly readable, includes very clear textual >>>>        descriptions, and >>>>        is very well organized. Easy to read in its simplicity. >>>>        However, it would >>>>        benefit from a more explicit connection to the transport encap >>>>        mechanics from >>>>        RFC 8300 (e.g., S4, S6.1). Specifically, I'd recommend adding >>>>        a Figure or an >>>>        SFF NSH Mapping Table example, to depict and/or exemplify the >>>>        SFF function. >>>> >>>> >>>>    I'm trying to envision what would make a good figure here. We >>>>    could add an additional line to Table 1 of RFC 8300 and reference >>>>    that table: >>>> >>>>           +------+------+---------------------+-------------------------+ >>>>           | SPI  | SI   | Next Hop(s)         | Transport >>>> Encapsulation | >>>>           +------+------+---------------------+-------------------------+ >>>>           | 25   | 220  | Label 5467          | MPLS >>>>                    | >>>>           +------+------+---------------------+-------------------------+ >>>> >>>>    Is that what you had in mind? If not, I'm open to other suggestions. >>>    If you think it helps, this would be a good addition. >>>> >>>>        >From an Operational standpoint, the document seems largely >>>>        appropriate in terms >>>>        of dataplane considerations. Some key considerations are >>>>        explicitly out of >>>>        scope: >>>>           The method used by the downstream receiving node to >>>>        advertise SFF >>>>           Labels to the upstream sending node is out of scope of this >>>>        document. >>>> >>>>        This really seems to mean that, with the simple definition in >>>> this >>>>        Informational document, interoperable implementations cannot >>>>        yet exist. If >>>>        there is no mechanism to advertise the SFF Label or to manage >>>>        the semantics of >>>>        this particular label, how will it know? Static configuration, >>>>        which is not >>>>        covered anyway, is not in my humble opinion a manageable >>>>        scalable approach. >>>> >>>> >>>>    Actually, while it is outside the scope of this document, it is >>>>    within the scope of draft-ietf-bess-nsh-bgp-control-plane, and >>>>    text is being added to the next revision of that draft to show how >>>>    it can be used to signal the encapsulation defined here. This was >>>>    worked out after this draft was forwarded to the IESG, but we can >>>>    now add a reference to that draft seeing as we'll be doing a >>>>    post-last-call update. >>>    I think that will help, as an Informative “one embodiment” type of >>> link. >>>> >>>>        Title: MPLS Encapsulation For The SFC NSH >>>> >>>>        RFC 8300 makes an explicit distinction between the terms >>>>        'encapsulation' and >>>>        'transport encapsulation' (see e.g., Figure 1, Section 1.5 5., >>>>        and Section 4 of >>>>        RFC 8300). >>>> >>>>        It seems to me that this is the "MPLS Transport Encapsulation >>>>        for the SFC NSH" >>>> >>>> >>>>    Thanks, we'll fix that. >>>> >>>> >>>>        2.  MPLS Encapsulation Using an SFF Label >>>> >>>>        Similarly, "2. MPLS Transport Encapsulation Using an SFF Label" >>>> >>>>           The encapsulation is a standard MPLS label stack [RFC3032] >>>>        with an >>>>           SFF Label at the bottom of the stack, followed by a NSH as >>>>        defined by >>>>           [RFC8300] and the NSH payload. >>>> >>>>        Insteadf of "NSH payload" I think "orignal packet" is meant. >>>> >>>> >>>>    RFC 8300 uses both "payload" and "original packet/frame", but the >>>>    latter more than the former. So we can change "payload" to >>>>    "original packet/frame". >>>> >>>> >>>>        Also, this encapsulation is Underdefined: What is the value of >>>>        TTL? TC? >>>> >>>> >>>>    I've been looking back at other related RFCs (such as PW and IP >>>>    VPN label definitions) and they're also mostly silent on these >>>>    values. I did find the following in RFC 6073: >>>> >>>>        The setting of the TTL of the PW MPLS >>>>        label is a matter of local policy on the originating PE, but >>>> SHOULD >>>>        be set to 255. >>>> >>>>    Regarding the TC, we can follow the example of RFC 6391: >>>> >>>>        This document does not define a use for the Traffic Class >>>> (TC) field >>>>        [RFC5462  ] (formerly >>>> known as the Experimental Use (EXP) bits >>>>        [RFC3032  ]) in the flow >>>> label.  Future documents may define a use for >>>>        these bits; therefore, implementations conforming to this >>>>        specification MUST set the TC field to zero at the ingress >>>> and MUST >>>>        ignore them at the egress. >>>> >>>>    Do you have any alternative suggestions? >>>    These two approaches sounds good to me. And Ack to the other >>>    previous responses. >>>> >>>>           Much like a pseudowire label, an SFF Label is allocated by the >>>>           downstream receiver of the NSH from its per-platform label >>>>        space. >>>> >>>>        A PW Label is more restrictive. RFC 8077 says it MUST be >>>>        allocated as >>>>        per-platform: >>>> >>>>           egress LSR only.  Note that the PW label must always be at >>>>        the bottom >>>>           of the packet's label stack, and labels MUST be allocated >>>>        from the >>>>           per-platform label space. >>>> >>>>        Is this the case for the SFF Label as well? If so, what is the >>>>        implication of >>>>        the MUST? If not, why is it different than other equivalent >>>>        similar labels? >>>> >>>> >>>>    We can change the text to: >>>> >>>>     Much like a pseudowire label, an SFF Label MUST be allocated by >>>>    the downstream receiver of the NSH from its per-platform label >>>>    space, since the meaning of the label is identical independent of >>>>    which incoming interface it is received [RFC3031]. >>>> >>>    That’s a great improvement. >>>> >>>>           2.  Push the SFF Label to identify the desired SFF in the >>>>        receiving >>>>               MPLS node. >>>> >>>>        TTL value? 1? 2? 255 for GTSM? GTSM RFC 5082 could be used here. >>>> >>>> >>>>    As I noted above, 255, although I used RFC 6073 as my source >>>>    rather than 5082. We'll add that here as well. >>>> >>>    Sounds good. >>>    These protocols use 5082 in one form or another: >>> https://datatracker.ietf.org/doc/rfc5082/referencedby/ >>>> >>>>        4.  Operations, Administration, and Maintenance (OAM) >>>>        Considerations >>>> >>>>           OAM at the SFC Layer is handled by SFC-defined mechanisms >>>>        [RFC8300]. >>>>           However, OAM may be required at the MPLS transport layer. >>>>         If so, >>>>           then standard MPLS-layer OAM mechanisms such as the Generic >>>>           Associated Channel [RFC5586] label may be used. >>>> >>>>        RFC 5586 is _not_ an OAM mechanism. It is an associated >>>>        channel creation >>>>        mechanism, over which OAM could be carried. >>>> >>>>        Thus, what traditional MPLS OAM can be carried here? Things >>>>        like RFC 4379 / RFC >>>>        8029 would need the definition of an SFF Label FEC (which does >>>>        not exist). >>>>        Which other one? IP/ICMP seems of very limited value. >>>> >>>> >>>>    That's a good point about RFC 5586. The intention is that the MPLS >>>>    OAM would be at the transport label layer above the SFF label, so >>>>    most any MPLS-layer OAM would be applicable. So how about >>>>    rewording to make that more clear: >>>> >>>>    OAM at the SFC Layer is handled by SFC-defined mechanisms >>>>    [RFC8300]. However, OAM may be required at the MPLS transport >>>>    layer.  If so, then standard MPLS-layer OAM mechanisms may be used >>>>    at the transport label layer (the labels above the SFF label). >>>    Looks good to me, thank you. >>>> >>>> >>>>        6.  Security Considerations >>>> >>>>        Have you considered the use of GTSM? >>>> >>>> >>>>    No, we hadn't. Can you point me to any examples of GTSM being used >>>>    in an MPLS or PW context? >>>    Yes, see above. >>>> >>>>        8.  References >>>> >>>>           [RFC7665]  Halpern, J., Ed. and C. Pignataro, Ed., "Service >>>>        Function >>>>                      Chaining (SFC) Architecture", RFC 7665, >>>>                      DOI 10.17487/RFC7665, October 2015, >>>>                      >>>        >. >>>> >>>>        SHould RFC 7665 be Normative? It defines the "SFF" which is >>>>        quite central to >>>>        understanding this document. >>>> >>>> >>>>    Good point. It was there because 7665 is an Informational RFC, but >>>>    RFC 8067 does allow normative references to informational RFCs, so >>>>    I'll move it. >>>    Thank you. >>>> >>>>        Other Nits and Editorials: >>>> >>>>           SFF Labels are similar to other service labels at the >>>>        bottom of an >>>>           MPLS label stack that denote the contents of the MPLS >>>>        payload being >>>>           other than IP, such as a layer 2 pseudowire, an IP packet >>>>        that is >>>>           routed in a VPN context with a private address, or an Ethernet >>>>           virtual private wire service. >>>> >>>>        This says "being other than IP, such as IP", which seems to be >>>>        self-contradictory :-) >>>> >>>>    :-) >>>> >>>>    How about we change "other than IP," to "other than a normally >>>>    routed IP packet”, >>>    That would disambiguate it. >>>    Thanks again. >>>    To me, the control plane / advertisement was the most important >>>    operationally-relevant comment. >>>    Thanks, >>>    Carlos. >>>> >>>>    Thanks again, >>>>    Andy > From nobody Thu Feb 28 07:38:41 2019 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 BBC97130FA2; Thu, 28 Feb 2019 07:38:19 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IETF Secretariat To: Cc: ipr-announce@ietf.org, sfc@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.92.1 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <155136829975.28748.11323148371959995011@ietfa.amsl.com> Date: Thu, 28 Feb 2019 07:38:19 -0800 Archived-At: Subject: [sfc] IPR Disclosure Huawei Technologies Co., Ltd's Statement about IPR related to draft-ietf-sfc-oam-framework X-BeenThere: sfc@ietf.org X-Mailman-Version: 2.1.29 List-Id: Network Service Chaining List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Feb 2019 15:38:31 -0000 Dear Sam Aldrin, Carlos Pignataro, Nagendra Kumar, Nobo Akiya, Ramki Krishnan, Anoop Ghanwani: An IPR disclosure that pertains to your Internet-Draft entitled "Service Function Chaining (SFC) Operation, Administration and Maintenance (OAM) Framework" (draft-ietf-sfc-oam-framework) was submitted to the IETF Secretariat on and has been posted on the "IETF Page of Intellectual Property Rights Disclosures" (https://datatracker.ietf.org/ipr/3440/). The title of the IPR disclosure is "Huawei Technologies Co.,Ltd's Statement about IPR related to draft-ietf-sfc-oam-framework" Thank you IETF Secretariat