From nobody Thu Nov 1 14:14:15 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3CCC012D4E9; Thu, 1 Nov 2018 14:14:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, 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 ieGScNQk2YMN; Thu, 1 Nov 2018 14:14:05 -0700 (PDT) Received: from mail-lj1-x231.google.com (mail-lj1-x231.google.com [IPv6:2a00:1450:4864:20::231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6940A127B92; Thu, 1 Nov 2018 14:14:04 -0700 (PDT) Received: by mail-lj1-x231.google.com with SMTP id z80-v6so13299276ljb.8; Thu, 01 Nov 2018 14:14:04 -0700 (PDT) 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=1kuSILXEvWpJnQeu8h4YYLmI13mCkPdSDdI6NXAsU4k=; b=MpqHbMtblGzJ0dcALuE12JjChirpvdSMEsQCCxl92ecJwR0f7bjkYMWIg0Ne1Q2RuG FOm1bnakH8XbyO5moz1y62LBk0ra9lqKREMhAKapf8UuZCqMZQPcFBiHnrhki2GjHRzt zEVl6lf6L5yJKwGKWqJVe9TseguvMGE2MzKsLF559MWjC36Ln4EUQByJILhjlLkzrQLv ODdMEwxbfxK0SYL2yovPvQFLfXsxaxn4BFKSmtNu2O/rodvC7tZg0IK5zM83i7qfWvg1 0jN4tvyPg5OcC8uZQiAVjFm+AXgewH83OTp5WaFMImX2zK2Ht2phCUIBqrCHgahVgVes tz7Q== 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=1kuSILXEvWpJnQeu8h4YYLmI13mCkPdSDdI6NXAsU4k=; b=Z0TEAezs2vYPeBK2BR5O7Rjo+0tl0M8XPNLt7aweBZ6fYbEnCN+3+driKKeEwkOD9/ ZP/RSLbA1mgVeIQlmT6NTdnKHz62CbSh2QF3Al+mNPQCG2MsZJUGUG/wwTXzyTHBI4n5 mBAmxpFBa8nhcc/XcXwjPzXN0uCb3zaqAApxsJy0qO/5xbpfpT/k/UTQxI/ZWkUxg6v5 egLJQGWWjFhDNKanRDyf5Oh7gBasd29Vf9y1g1UIf/w+JH3L07z/PwoqDh5CqNoG7Edx HGoj6PfPNnyUMC8i3r51cLMaAf/0VKkXaNBXEY0udaDY61/W9MGHbfF+U2k83RW2v7HH r6Rw== X-Gm-Message-State: AGRZ1gJXzVOk474um6tbOHdV9tqSHBk5DoP0TpnktDvx+Cdxtv1ijid2 aAOrhBPrFwZQlgrp5gaft4sodjQCK47925Xq6/0= X-Google-Smtp-Source: AJdET5dGxhWjKtVv2Tfn8RVgrPoL6OKo+/o97dQej0gOZJPpEG/0HZGuDG9uOkPCch3Hwad9bCYxbbop/o1WY6vGnOs= X-Received: by 2002:a2e:800b:: with SMTP id j11-v6mr4346158ljg.114.1541106842472; Thu, 01 Nov 2018 14:14:02 -0700 (PDT) MIME-Version: 1.0 References: <15CB10A6-6AF4-460F-A71D-56F28D9D7784@cisco.com> In-Reply-To: <15CB10A6-6AF4-460F-A71D-56F28D9D7784@cisco.com> From: Greg Mirsky Date: Thu, 1 Nov 2018 14:13:51 -0700 Message-ID: Subject: Re: [mpls] MPLS WG adoption call for draft-mirsky-mpls-p2mp-bfd To: "Carlos Pignataro (cpignata)" Cc: mpls-chairs@ietf.org, mpls@ietf.org, rtg-bfd WG Content-Type: multipart/alternative; boundary="000000000000e81c810579a0e596" Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Nov 2018 21:14:08 -0000 --000000000000e81c810579a0e596 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Carlos, thank you for your comments. Please find my notes, answers in-line tagged GIM>>. Regards, Greg On Thu, Oct 25, 2018 at 8:47 PM Carlos Pignataro (cpignata) < cpignata@cisco.com> wrote: > Hi, > > Cc BFD WG > > It would be useful to understand the use case motivation or applicability > of this draft, other than it can be done. > GIM>> The motivation can be seen in the following (from another draft that discusses OAM over G-ACh: In some environments, the overhead of extra IP/UDP encapsulations may be considered as overburden and make using more compact G-ACh encapsulation attractive. Will add text in the draft. > > I=E2=80=99m also increasingly concerned by confusing scope and definition= of > specifications. > > For example: > > https://tools.ietf.org/html/draft-mirsky-mpls-p2mp-bfd-04#section-3.2 > > 3.2. Non-IP Encapsulation of Multipoint BFD > > Non-IP encapsulation for multipoint BFD over p2mp MPLS LSP MUST use > Generic Associated Channel (G-ACh) Label (GAL) [RFC5586] at the > bottom of the label stack followed by Associated Channel Header > (ACH). Channel Type field in ACH MUST be set to BFD CV [RFC6428]. > > > First, there=E2=80=99s no definition for non-IP BFD in RFC 5586 =E2=80=94= only in RFC 5885. > GIM>> RFC 5586 defined the use of GAL. I think that this reference is appropriate. I agree that the second reference should be to RFC 5885, not RFC 6428. Will make the change. > Second, the specification in RFC 6428 applies to MPLS Transport Profile > only. NOT for MPLS, and explicitly NOT for P2MP! > > https://tools.ietf.org/html/rfc6428#section-1 > > This document specifies the BFD extension and behavior to satisfy the > CC, proactive CV monitoring, and the RDI functional requirements for > both co-routed and associated bidirectional LSPs. Supported > encapsulations include Generic Associated Channel Label (GAL) / > Generic Associated Channel (G-ACh), Virtual Circuit Connectivity > Verification (VCCV), and UDP/IP. Procedures for unidirectional > point-to-point (P2P) and point-to-multipoint (P2MP) LSPs are for > further study. > > > So, no, this does not work. > > RFC 6428 does not have scope for P2MP. > And RFC 5586 does not specify anything for BFD. Instead, what needs to be > cited (appropriately and expanded) is RFC 5885 > GIM>> RFC 5586 specifies the use of GAL and G-ACh and the reference is used in this context. > > https://tools.ietf.org/html/rfc6428#section-4 > RFC 5884 - BFD CC in UDP/IP/LSP > RFC 5885 - BFD CC in G-ACh > GIM>> I'd point that it is for p2p BFD CC, and p2mp BFD uses different from p2p BFD method to demultiplex BFD control packets. > RFC 5085 - UDP/IP in G-ACh > MPLS-TP - CC/CV in GAL/G-ACh or G-ACh > > > > Thanks, > > =E2=80=94 Carlos Pignataro > > On Oct 13, 2018, at 4:24 PM, Greg Mirsky wrote: > > Dear WG Chairs, et al., > as the author of the BFD for Multipoint Networks over Point-to-Multi-Poin= t > MPLS LSP (draft-mirsky-mpls-p2mp-bfd) I would like to ask you to consider > WG adoption call of the draft. The document addresses non-IP encapsulatio= n > of p2mp BFD over MPLS LSP that may be useful if the overhead of IP, > particularly IPv6, encapsulation is the concern. The base specification o= f > BFD for Multipoint Networks is at this time in IESG LC. > > Regards, > Greg > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls > > > --000000000000e81c810579a0e596 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Carlos,
thank you for your comment= s. Please find my notes, answers in-line tagged GIM>>.

=
Regards,
Greg

On Thu, Oct 25, 2018 at 8:47 PM Carlos Pignataro (cpignata) <= cpignata@cisco.com> wrote:
=
Hi,

Cc BFD WG

It would be useful to understand the use case motivation or applicabil= ity of this draft, other than it can be done.
= GIM>>=C2=A0 The motivation can be seen in the following (from another= draft that discusses OAM over G-ACh:
=C2=A0 In some
=C2=A0 =C2=A0environments, the overhead of extra IP/UDP encapsulations m= ay be
=C2=A0 =C2=A0considered as overburden and make using more c= ompact G-ACh
=C2=A0 =C2=A0encapsulation attractive.
Will add text in the draft.

I=E2=80=99m also increasingly concerned by confusing scope and definit= ion of specifications.

For example:


3.2.=C2=A0 Non-IP Encapsulation of Multipoint BFD

=C2=A0 =C2=A0Non-IP encapsulation for multipoint BFD over p2mp MPLS LS= P MUST use
=C2=A0 =C2=A0Generic Associated Channel (G-ACh) Label (GAL) [RFC5586] = at the
=C2=A0 =C2=A0bottom of the label stack followed by Associated Channel = Header
=C2=A0 =C2=A0(ACH).=C2=A0 Channel Type field in ACH MUST be set to BFD= CV [RFC6428].


First, there=E2=80=99s no definition for non-IP BFD in RFC 5586 =E2=80= =94 only in RFC 5885.
GIM>> RFC 5586 def= ined the use of GAL. I think that this reference is appropriate. I agree th= at the second reference should be to RFC 5885, not RFC 6428. Will make the = change.
Second, the specification in RFC 6428 applies to=C2=A0MPLS Transport P= rofile only. NOT for MPLS, and explicitly NOT for P2MP!


=C2=A0 =C2=A0This document specifies the BFD extension and behavior to= satisfy the
=C2=A0 =C2=A0CC, proactive CV monitoring, and the RDI functional requi= rements for
=C2=A0 =C2=A0both co-routed and associated bidirectional LSPs.=C2=A0 S= upported
=C2=A0 =C2=A0encapsulations include Generic Associated Channel Label (= GAL) /
=C2=A0 =C2=A0Generic Associated Channel (G-ACh), Virtual Circuit Conne= ctivity
=C2=A0 =C2=A0Verification (VCCV), and UDP/IP.=C2=A0 Procedures for uni= directional
=C2=A0 =C2=A0point-to-point (P2P) and point-to-multipoint (P2MP) LSPs = are for
=C2=A0 =C2=A0further study.


So, no, this does not work.

RFC 6428 does not have scope for P2MP.
And RFC 5586 does not specify anything for BFD. Instead, what needs to= be cited (appropriately and expanded) is RFC 5885
=
GIM>> RFC 5586 specifies the use of GAL and G-ACh and the refere= nce is used in this context.

=C2=A0 =C2=A0 =C2=A0=C2=A0RFC 5884 - BFD CC in UDP/IP/LSP
=C2=A0 =C2=A0 =C2=A0 RFC 5885 - BFD CC in G-ACh=C2=A0
GIM>> I'd point that it is for p2p BFD CC, and= p2mp BFD uses different from p2p BFD method to demultiplex BFD control pac= kets.=C2=A0
=C2=A0 =C2=A0 =C2=A0 RFC 5085 - UDP/IP in G-ACh
=C2=A0 =C2=A0 =C2=A0 =C2=A0MPLS-TP - CC/CV in GAL/G-ACh or G-ACh



Thanks,

=E2=80=94 Carlos Pignataro

On Oct 13, 2018, at 4:24 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Dear WG Chairs, et al.,
as the author of the BFD for Multipoint Networks over Point-to-Multi-P= oint MPLS LSP (draft-mirsky-mpls-p2mp-bfd) I would like to ask you to consi= der WG adoption call of the draft. The document addresses non-IP encapsulat= ion of p2mp BFD over MPLS LSP that may be useful if the overhead of IP, particularly IPv6, encapsula= tion is the concern. The base specification of BFD for Multipoint Networks = is at this time in IESG LC.

Regards,
Greg
_______________________________________________
mpls mailing list
mpls@ietf.org
ht= tps://www.ietf.org/mailman/listinfo/mpls

--000000000000e81c810579a0e596-- From nobody Sun Nov 4 19:53:53 2018 Return-Path: X-Original-To: rtg-bfd@ietf.org Delivered-To: rtg-bfd@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 8826E129619; Sun, 4 Nov 2018 19:53:45 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IETF Secretariat To: Cc: rtg-bfd@ietf.org, ipr-announce@ietf.org Subject: IPR Disclosure Ciena Corporation's Statement about IPR related to draft-ietf-bfd-optimizing-authentication X-Test-IDTracker: no X-IETF-IDTracker: 6.87.3 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <154139002554.31837.10221034648542755197@ietfa.amsl.com> Date: Sun, 04 Nov 2018 19:53:45 -0800 Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Nov 2018 03:53:46 -0000 Dear Mahesh Jethanandani, Ashesh Mishra, Ankur Saxena, Manav Bhatia: An IPR disclosure that pertains to your Internet-Draft entitled "Optimizing BFD Authentication" (draft-ietf-bfd-optimizing-authentication) 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/3328/). 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dj4NCjwvYmxvY2txdW90ZT4NCjwvZGl2Pg0KPC9kaXY+DQo8L2Rpdj4NCjwvZGl2Pg0KPC9kaXY+ DQo8L2Jsb2NrcXVvdGU+DQo8L2Rpdj4NCjxiciBjbGFzcz0iIj4NCjwvZGl2Pg0KPC9ib2R5Pg0K PC9odG1sPg0K --_000_5BFD9FF7DBF848E6BF451D29AFB90034ciscocom_-- From nobody Mon Nov 5 20:50:12 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E766F130E16; Mon, 5 Nov 2018 20:50:03 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, 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 J2ng-MLCQBYF; Mon, 5 Nov 2018 20:50:00 -0800 (PST) Received: from pipi.pi.nu (pipi.pi.nu [83.168.239.141]) (using TLSv1.1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6E30F12D4EA; Mon, 5 Nov 2018 20:50:00 -0800 (PST) Received: from [31.133.148.96] (dhcp-9460.meeting.ietf.org [31.133.148.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: loa@pi.nu) by pipi.pi.nu (Postfix) with ESMTPSA id 78B4D1802AAA; Tue, 6 Nov 2018 05:49:56 +0100 (CET) Subject: Re: [mpls] MPLS WG adoption call for draft-mirsky-mpls-p2mp-bfd To: "Carlos Pignataro (cpignata)" , Greg Mirsky Cc: mpls , rtg-bfd WG , "mpls-chairs@ietf.org" References: <15CB10A6-6AF4-460F-A71D-56F28D9D7784@cisco.com> <5BFD9FF7-DBF8-48E6-BF45-1D29AFB90034@cisco.com> From: Loa Andersson Message-ID: <212c9ad1-e932-9e0e-626f-39d13e18f7a1@pi.nu> Date: Tue, 6 Nov 2018 11:49:54 +0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <5BFD9FF7-DBF8-48E6-BF45-1D29AFB90034@cisco.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Nov 2018 04:50:05 -0000 Carlos, Since the a wg adoption poll I read your comments as that we are doing progress, and that we can address the rest during the wg process, correct? /Loa On 2018-11-06 00:11, Carlos Pignataro (cpignata) wrote: > Hi Greg, > > Many thanks for your response and suggestions! Please see inline. > >> On Nov 2, 2018, at 6:13 AM, Greg Mirsky > > wrote: >> >> Hi Carlos, >> thank you for your comments. Please find my notes, answers in-line >> tagged GIM>>. >> >> Regards, >> Greg >> >> On Thu, Oct 25, 2018 at 8:47 PM Carlos Pignataro (cpignata) >> > wrote: >> >> Hi, >> >> Cc BFD WG >> >> It would be useful to understand the use case motivation or >> applicability of this draft, other than it can be done. >> >> GIM>>  The motivation can be seen in the following (from another draft >> that discusses OAM over G-ACh: >>   In some >>    environments, the overhead of extra IP/UDP encapsulations may be >>    considered as overburden and make using more compact G-ACh >>    encapsulation attractive. >> Will add text in the draft. > > CMP: Thank you very much. This is a good start, although it would be > useful to add precision into which environments specifically, and the > burden comparison between IP/UDP and G-ACh. > >> >> I’m also increasingly concerned by confusing scope and definition >> of specifications. >> >> For example: >> >> https://tools.ietf.org/html/draft-mirsky-mpls-p2mp-bfd-04#section-3.2 >> >> 3.2.  Non-IP Encapsulation of Multipoint BFD >> >>    Non-IP encapsulation for multipoint BFD over p2mp MPLS LSP MUST use >>    Generic Associated Channel (G-ACh) Label (GAL) [RFC5586] at the >>    bottom of the label stack followed by Associated Channel Header >>    (ACH).  Channel Type field in ACH MUST be set to BFD CV [RFC6428]. >> >> >> First, there’s no definition for non-IP BFD in RFC 5586 — only in >> RFC 5885. >> >> GIM>> RFC 5586 defined the use of GAL. I think that this reference is >> appropriate. I agree that the second reference should be to RFC 5885, >> not RFC 6428. Will make the change. > > CMP: Thank you. However, RFC 5885 is in the context of PW VCCV — is > there a missing definition in the specs for BFD over G-ACh generically? > >> Second, the specification in RFC 6428 applies to MPLS Transport >> Profile only. NOT for MPLS, and explicitly NOT for P2MP! >> >> https://tools.ietf.org/html/rfc6428#section-1 >> >>    This document specifies the BFD extension and behavior to >> satisfy the >>    CC, proactive CV monitoring, and the RDI functional >> requirements for >>    both co-routed and associated bidirectional LSPs.  Supported >>    encapsulations include Generic Associated Channel Label (GAL) / >>    Generic Associated Channel (G-ACh), Virtual Circuit Connectivity >>    Verification (VCCV), and UDP/IP.  Procedures for unidirectional >>    point-to-point (P2P) and point-to-multipoint (P2MP) LSPs are for >>    further study. >> >> >> So, no, this does not work. >> >> RFC 6428 does not have scope for P2MP. >> And RFC 5586 does not specify anything for BFD. Instead, what >> needs to be cited (appropriately and expanded) is RFC 5885 >> >> GIM>> RFC 5586 specifies the use of GAL and G-ACh and the reference is >> used in this context. > > CMP: This is the same comment as above. > >> >> https://tools.ietf.org/html/rfc6428#section-4 >>       RFC 5884 - BFD CC in UDP/IP/LSP >>       RFC 5885 - BFD CC in G-ACh >> >> GIM>> I'd point that it is for p2p BFD CC, and p2mp BFD uses different >> from p2p BFD method to demultiplex BFD control packets. > > > CMP: Apologies I did not understand this response. > > CMP: Thanks again for considering the comment to improve the document. > > Thanks, > > Carlos. > > >>       RFC 5085 - UDP/IP in G-ACh >>        MPLS-TP - CC/CV in GAL/G-ACh or G-ACh >> >> >> >> Thanks, >> >> — Carlos Pignataro >> >>> On Oct 13, 2018, at 4:24 PM, Greg Mirsky >> > wrote: >>> >>> Dear WG Chairs, et al., >>> as the author of the BFD for Multipoint Networks over >>> Point-to-Multi-Point MPLS LSP (draft-mirsky-mpls-p2mp-bfd) I >>> would like to ask you to consider WG adoption call of the draft. >>> The document addresses non-IP encapsulation of p2mp BFD over MPLS >>> LSP that may be useful if the overhead of IP, particularly IPv6, >>> encapsulation is the concern. The base specification of BFD for >>> Multipoint Networks is at this time in IESG LC. >>> >>> Regards, >>> Greg >>> _______________________________________________ >>> mpls mailing list >>> mpls@ietf.org >>> https://www.ietf.org/mailman/listinfo/mpls >> > > > > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls > -- Loa Andersson email: loa@pi.nu Senior MPLS Expert Bronze Dragon Consulting phone: +46 739 81 21 64 From nobody Tue Nov 6 02:18:56 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7FCF0130DFF; Tue, 6 Nov 2018 02:18:46 -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 9DRoyKbHkUzU; Tue, 6 Nov 2018 02:18:43 -0800 (PST) Received: from mail-lf1-x131.google.com (mail-lf1-x131.google.com [IPv6:2a00:1450:4864:20::131]) (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 A617A1277C8; Tue, 6 Nov 2018 02:18:42 -0800 (PST) Received: by mail-lf1-x131.google.com with SMTP id m18-v6so8389020lfl.11; Tue, 06 Nov 2018 02:18:42 -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=C+oH3FzukWPCFT3YSZ5T6/tA3niETD82eqXWGX8wo34=; b=Vk+FZjX6mf/ZVV+s9gaiappZ9gRic1scVxbB90M2GfpWhcu0FW/QNTCoRbSPlLzqdA 8AnBcvoe9e+tD5MBW9XiXzqJPlzcLFlMmeMAM5x5+fQ1sC+PV2LZoQ467WJvhI7hCmp+ Cjf5+lEPXscPraBYjDvTK93w51Ub732Qt/smgKK/UlmNb7GQnQy/l4YG8oGNAeDEulna dwgK6bjK3WRO9DxDxlfm64SexBmV+oOmBVFGeQhdMfK58c0+ws7oafXRoLvviByQB6SN SPvXwKPVppt1+uEpcaPID5C+XBaUIqZUrbpUm1VGrcl5E/aC7StHFGcrMjvHbLQTGXwp ObkA== 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=C+oH3FzukWPCFT3YSZ5T6/tA3niETD82eqXWGX8wo34=; b=Rqj8I9Idzysu45tbrFfEruLVUXv/FjDLyKBO8U8/zezWZeY0Mf1sjVcV3kfmOHV4N4 QMDFQCeptyBM1qAquuPjkdIW2A1MxAfayplK2JldDWo9QTgwzLNmW41dhKRav/jyo+JQ P5DkvgzISgKdN5Ukm7o41kxoPojL2ED10/PPNDTKjKiDYgyRS4p3H2D23oe9Vfr5sy/2 P3fdRnrArSjWA6PmM4/DjF922vgUaLltMgA0IZC06IBCRNPYwSp3n4CFAkLdOtUdiZvq CI/aDsWwLNcrj2Rm6KnLMOp3mL/MLDvnshYI+ogzLV/jj/LTS75+pGViTdkjMBOBLAZ6 sO2w== X-Gm-Message-State: AGRZ1gI9gyhd+F5ZqZUCgvxwkR4YDixXXeo7jQnUnXx716UK8/krbei4 1JbTCXetK4QUJ7UvTkuO5ipTZhX1JkkXzXNQYD0= X-Google-Smtp-Source: AJdET5fwnXRFmanF0WJOeVPC2NYd8yzSHhOnBgqDfHm2epegye5QfFNwc1Dz7b7T9+LoOjV8tljgSh4SX8oeqbqbVJc= X-Received: by 2002:a19:d04f:: with SMTP id h76mr14217142lfg.52.1541499520670; Tue, 06 Nov 2018 02:18:40 -0800 (PST) MIME-Version: 1.0 References: <15CB10A6-6AF4-460F-A71D-56F28D9D7784@cisco.com> <5BFD9FF7-DBF8-48E6-BF45-1D29AFB90034@cisco.com> In-Reply-To: <5BFD9FF7-DBF8-48E6-BF45-1D29AFB90034@cisco.com> From: Greg Mirsky Date: Tue, 6 Nov 2018 17:18:30 +0700 Message-ID: Subject: Re: [mpls] MPLS WG adoption call for draft-mirsky-mpls-p2mp-bfd To: "Carlos Pignataro (cpignata)" Cc: mpls-chairs@ietf.org, mpls@ietf.org, rtg-bfd WG Content-Type: multipart/alternative; boundary="00000000000059e7470579fc53d8" Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Nov 2018 10:18:46 -0000 --00000000000059e7470579fc53d8 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Carlos, thank you for your consideration of my responses. Glad that we're converging. Please find additional notes in-line tagged GIM2>>. Regards, Greg On Tue, Nov 6, 2018 at 12:11 AM Carlos Pignataro (cpignata) < cpignata@cisco.com> wrote: > Hi Greg, > > Many thanks for your response and suggestions! Please see inline. > > On Nov 2, 2018, at 6:13 AM, Greg Mirsky wrote: > > Hi Carlos, > thank you for your comments. Please find my notes, answers in-line tagged > GIM>>. > > Regards, > Greg > > On Thu, Oct 25, 2018 at 8:47 PM Carlos Pignataro (cpignata) < > cpignata@cisco.com> wrote: > >> Hi, >> >> Cc BFD WG >> >> It would be useful to understand the use case motivation or applicabilit= y >> of this draft, other than it can be done. >> > GIM>> The motivation can be seen in the following (from another draft > that discusses OAM over G-ACh: > In some > environments, the overhead of extra IP/UDP encapsulations may be > considered as overburden and make using more compact G-ACh > encapsulation attractive. > Will add text in the draft. > > > CMP: Thank you very much. This is a good start, although it would be > useful to add precision into which environments specifically, and the > burden comparison between IP/UDP and G-ACh. > GIM2>> Thank you for agreeing to this, and I've added the text in the working verion. Will work on improving the text in the meantime. > > >> I=E2=80=99m also increasingly concerned by confusing scope and definitio= n of >> specifications. >> >> For example: >> >> https://tools.ietf.org/html/draft-mirsky-mpls-p2mp-bfd-04#section-3.2 >> >> 3.2. Non-IP Encapsulation of Multipoint BFD >> >> Non-IP encapsulation for multipoint BFD over p2mp MPLS LSP MUST use >> Generic Associated Channel (G-ACh) Label (GAL) [RFC5586] at the >> bottom of the label stack followed by Associated Channel Header >> (ACH). Channel Type field in ACH MUST be set to BFD CV [RFC6428]. >> >> >> First, there=E2=80=99s no definition for non-IP BFD in RFC 5586 =E2=80= =94 only in RFC >> 5885. >> > GIM>> RFC 5586 defined the use of GAL. I think that this reference is > appropriate. I agree that the second reference should be to RFC 5885, not > RFC 6428. Will make the change. > > > CMP: Thank you. However, RFC 5885 is in the context of PW VCCV =E2=80=94 = is there > a missing definition in the specs for BFD over G-ACh generically? > GIM2>> I think that the following quote from RFC 5586 set the relationship between Channel Type field in PW ACH and G-ACh: Channel Types for the Associated Channel Header are allocated from the IANA "PW Associated Channel Type" registry [RFC4446]. I understand that that there's one and only one registry and channel values are equally applicable to PW ACH and G-ACh. And full name of the registry now is MPLS Generalized Associated Channel (G-ACh) Types (including Pseudowire Associated Channel Types). > > Second, the specification in RFC 6428 applies to MPLS Transport Profile >> only. NOT for MPLS, and explicitly NOT for P2MP! >> >> https://tools.ietf.org/html/rfc6428#section-1 >> >> This document specifies the BFD extension and behavior to satisfy the >> CC, proactive CV monitoring, and the RDI functional requirements for >> both co-routed and associated bidirectional LSPs. Supported >> encapsulations include Generic Associated Channel Label (GAL) / >> Generic Associated Channel (G-ACh), Virtual Circuit Connectivity >> Verification (VCCV), and UDP/IP. Procedures for unidirectional >> point-to-point (P2P) and point-to-multipoint (P2MP) LSPs are for >> further study. >> >> >> So, no, this does not work. >> >> RFC 6428 does not have scope for P2MP. >> And RFC 5586 does not specify anything for BFD. Instead, what needs to b= e >> cited (appropriately and expanded) is RFC 5885 >> > GIM>> RFC 5586 specifies the use of GAL and G-ACh and the reference is > used in this context. > > > CMP: This is the same comment as above. > > >> https://tools.ietf.org/html/rfc6428#section-4 >> RFC 5884 - BFD CC in UDP/IP/LSP >> RFC 5885 - BFD CC in G-ACh >> > GIM>> I'd point that it is for p2p BFD CC, and p2mp BFD uses different > from p2p BFD method to demultiplex BFD control packets. > > > > CMP: Apologies I did not understand this response. > GIM2>> Apologies for sending partial explanation. P2MP BFD cannot use Your Discriminator field to demultiplex the recieved BFD control packet. BFD for Multipoint Networks defines the special procedure that requires the use of Source ID. When the encapsulation of BFD control packet does not include IP/UDP header, the Source ID can be provided as Source MEP-ID TLV in MPLS-TP BFD CV. This draft proposes the new IP Address TLV for that. Thus I have to correct myself and re-state the earlier text in the draft that the value in the Channel Type filed of G-ACh must be MPLS-TP CV (0x0023). > > CMP: Thanks again for considering the comment to improve the document. > > Thanks, > > Carlos. > > > RFC 5085 - UDP/IP in G-ACh >> MPLS-TP - CC/CV in GAL/G-ACh or G-ACh >> >> >> >> Thanks, >> >> =E2=80=94 Carlos Pignataro >> >> On Oct 13, 2018, at 4:24 PM, Greg Mirsky wrote: >> >> Dear WG Chairs, et al., >> as the author of the BFD for Multipoint Networks over >> Point-to-Multi-Point MPLS LSP (draft-mirsky-mpls-p2mp-bfd) I would like = to >> ask you to consider WG adoption call of the draft. The document addresse= s >> non-IP encapsulation of p2mp BFD over MPLS LSP that may be useful if the >> overhead of IP, particularly IPv6, encapsulation is the concern. The bas= e >> specification of BFD for Multipoint Networks is at this time in IESG LC. >> >> Regards, >> Greg >> _______________________________________________ >> mpls mailing list >> mpls@ietf.org >> https://www.ietf.org/mailman/listinfo/mpls >> >> > --00000000000059e7470579fc53d8 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Carlos,
thank you= for your consideration of my responses. Glad that we're converging. Pl= ease find additional notes in-line tagged GIM2>>.

Regards,
Greg

On Tue, Nov 6, 2018 at 12:11 AM Carlos Pignataro (cpignata) <cpignata@cisco.com> wrote:
Hi Greg,

Many thanks for your response and suggestions! Please see inline.

On Nov 2, 2018, at 6:13 AM, Greg Mirsky <gregimirsky@gmail.com> wrote:

Hi Carlos,
thank you for your comments. Please find my notes, answers in-line tag= ged GIM>>.

Regards,
Greg

On Thu, Oct 25, 2018 at 8:47 PM Carlos Pignataro (cpignata= ) <cpignata@cisc= o.com> wrote:
Hi,

Cc BFD WG

It would be useful to understand the use case motivation or applicabil= ity of this draft, other than it can be done.
GIM>>=C2=A0 The motivation can be seen in the following (from an= other draft that discusses OAM over G-ACh:
=C2=A0 In some
=C2=A0 =C2=A0environments, the overhead of extra IP/UDP encapsulations= may be
=C2=A0 =C2=A0considered as overburden and make using more compact G-AC= h
=C2=A0 =C2=A0encapsulation attractive.
Will add text in the draft.

CMP: Thank you very much. This is a good start, although it would be u= seful to add precision into which environments specifically, and the burden= comparison between IP/UDP and G-ACh.
<= div>GIM2>> Thank you for agreeing to this, and I've added the tex= t in the working verion. Will work on improving the text in the meantime.


I=E2=80=99m also increasingly concerned by confusing scope and definit= ion of specifications.

For example:


3.2.=C2=A0 Non-IP Encapsulation of Multipoint BFD

=C2=A0 =C2=A0Non-IP encapsulation for multipoint BFD over p2mp MPLS LS= P MUST use
=C2=A0 =C2=A0Generic Associated Channel (G-ACh) Label (GAL) [RFC5586] = at the
=C2=A0 =C2=A0bottom of the label stack followed by Associated Channel = Header
=C2=A0 =C2=A0(ACH).=C2=A0 Channel Type field in ACH MUST be set to BFD= CV [RFC6428].


First, there=E2=80=99s no definition for non-IP BFD in RFC 5586 =E2=80= =94 only in RFC 5885.
GIM>> RFC 5586 defined the use of GAL. I think that this referen= ce is appropriate. I agree that the second reference should be to RFC 5885,= not RFC 6428. Will make the change.

CMP: Thank you. However, RFC 5885 is in the context of PW VCCV =E2=80= =94 is there a missing definition in the specs for BFD over G-ACh generical= ly?
GIM2>> I think that the = following quote from RFC 5586 set the relationship between Channel Type fie= ld in PW ACH and G-ACh:
=C2=A0 =C2=A0 Channel Types for the Assoc= iated Channel Header are allocated from
=C2=A0 =C2=A0 the IANA &q= uot;PW Associated Channel Type" registry [RFC4446].=C2=A0
I = understand that that there's one and only one registry and channel valu= es are equally applicable to PW ACH and G-ACh. And full name of the registr= y now is=C2=A0MPLS Generalized Associated Channel (G-ACh) Types (including = Pseudowire Associated Channel Types).

Second, the specification in RFC 6428 applies to=C2=A0MPLS Transport P= rofile only. NOT for MPLS, and explicitly NOT for P2MP!


=C2=A0 =C2=A0This document specifies the BFD extension and behavior to= satisfy the
=C2=A0 =C2=A0CC, proactive CV monitoring, and the RDI functional requi= rements for
=C2=A0 =C2=A0both co-routed and associated bidirectional LSPs.=C2=A0 S= upported
=C2=A0 =C2=A0encapsulations include Generic Associated Channel Label (= GAL) /
=C2=A0 =C2=A0Generic Associated Channel (G-ACh), Virtual Circuit Conne= ctivity
=C2=A0 =C2=A0Verification (VCCV), and UDP/IP.=C2=A0 Procedures for uni= directional
=C2=A0 =C2=A0point-to-point (P2P) and point-to-multipoint (P2MP) LSPs = are for
=C2=A0 =C2=A0further study.


So, no, this does not work.

RFC 6428 does not have scope for P2MP.
And RFC 5586 does not specify anything for BFD. Instead, what needs to= be cited (appropriately and expanded) is RFC 5885
GIM>> RFC 5586 specifies the use of GAL and G-ACh and the refere= nce is used in this context.

CMP: This is the same comment as above.


=C2=A0 =C2=A0 =C2=A0=C2=A0RFC 5884 - BFD CC in UDP/IP/LSP
=C2=A0 =C2=A0 =C2=A0 RFC 5885 - BFD CC in G-ACh=C2=A0
GIM>> I'd point that it is for p2p BFD CC, and p2mp BFD uses= different from p2p BFD method to demultiplex BFD control packets.=C2=A0


CMP: Apologies I did not understand this response.
GIM2>> Apologies for sending partial explanation. P2MP BFD= cannot use Your Discriminator field to demultiplex the recieved BFD contro= l packet. BFD for Multipoint Networks defines the special procedure that re= quires the use of Source ID. When the encapsulation of BFD control packet d= oes not include IP/UDP header, the Source ID can be provided as Source MEP-= ID TLV in MPLS-TP BFD CV. This draft proposes the new IP Address TLV for th= at. Thus I have to correct myself and re-state the earlier text in the draf= t that the value in the Channel Type filed of G-ACh must be MPLS-TP CV (0x0= 023).

CMP: Thanks again for considering the comment to improve the document.=

Thanks,

Carlos.


=C2=A0 =C2=A0 =C2=A0 RFC 5085 - UDP/IP in G-ACh
=C2=A0 =C2=A0 =C2=A0 =C2=A0MPLS-TP - CC/CV in GAL/G-ACh or G-ACh



Thanks,

=E2=80=94 Carlos Pignataro

On Oct 13, 2018, at 4:24 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Dear WG Chairs, et al.,
as the author of the BFD for Multipoint Networks over Point-to-Multi-P= oint MPLS LSP (draft-mirsky-mpls-p2mp-bfd) I would like to ask you to consi= der WG adoption call of the draft. The document addresses non-IP encapsulat= ion of p2mp BFD over MPLS LSP that may be useful if the overhead of IP, particularly IPv6, encapsula= tion is the concern. The base specification of BFD for Multipoint Networks = is at this time in IESG LC.

Regards,
Greg
_______________________________________________
mpls mailing list
mpls@ietf.org
ht= tps://www.ietf.org/mailman/listinfo/mpls

--00000000000059e7470579fc53d8-- From nobody Wed Nov 7 11:47:04 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5DF3A130E3B for ; Wed, 7 Nov 2018 11:46:59 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, 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 xCKC7fCc8FfI for ; Wed, 7 Nov 2018 11:46:57 -0800 (PST) Received: from slice.pfrc.org (slice.pfrc.org [67.207.130.108]) by ietfa.amsl.com (Postfix) with ESMTP id CE1CA130E48 for ; Wed, 7 Nov 2018 11:46:57 -0800 (PST) Received: by slice.pfrc.org (Postfix, from userid 1001) id 90B071E4FB; Wed, 7 Nov 2018 14:46:14 -0500 (EST) Date: Wed, 7 Nov 2018 14:46:14 -0500 From: Jeffrey Haas To: rtg-bfd@ietf.org Subject: BFD Working Group calls ending November 9 Message-ID: <20181107194614.GA20487@pfrc.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Nov 2018 19:47:03 -0000 Working Group, As a reminder, calls are ongoing for the following ending on November 9: Working Group Last Call: draft-ietf-bfd-vxlan Adoption: draft-mirsky-bfd-mpls-demand draft-haas-bfd-large-packets draft-chen-bfd-unsolicted In particular, please supply your feedback on the last call above. -- Jeff From nobody Wed Nov 7 20:21:06 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from 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([64.101.220.160]) with mapi id 15.00.1395.000; Wed, 7 Nov 2018 23:52:43 -0500 From: "Carlos Pignataro (cpignata)" To: Greg Mirsky CC: "mpls-chairs@ietf.org" , mpls , rtg-bfd WG Subject: Re: [mpls] MPLS WG adoption call for draft-mirsky-mpls-p2mp-bfd Thread-Topic: [mpls] MPLS WG adoption call for draft-mirsky-mpls-p2mp-bfd Thread-Index: AQHUcjCnBAZrmoA7/EOd5Vk0epnVbaVBxIEAgAEfEACAAsmgAA== Date: Thu, 8 Nov 2018 04:52:43 +0000 Message-ID: <81371D06-2A1A-480F-B65D-FAF04E408A04@cisco.com> References: <15CB10A6-6AF4-460F-A71D-56F28D9D7784@cisco.com> <5BFD9FF7-DBF8-48E6-BF45-1D29AFB90034@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 (2.3445.101.1) x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.70.233.80] Content-Type: multipart/alternative; boundary="_000_81371D062A1A480FB65DFAF04E408A04ciscocom_" MIME-Version: 1.0 X-Outbound-SMTP-Client: 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Wed, 07 Nov 2018 21:20:54 -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=tEKqj7qCG9J1lHieBs4DsFs71orOXs50PMq+1Bulhcg=; b=BrVEESmx7FIoX1JMQhMmy+4RuMHrKSPe1txOgCv8d3vhvy3Kdj28gEIvJfwWVADhO7 iL45AnV/Ayl/zTL+3Ab+fpGPwmLETqF8OVzGskSrcD0Eu9qyrQB2Vton4U8U+TcGZgI1 hWSlWdgsC4wZ+eIO7+X23EFaEtrCKO7G/WKBkFxxto1XThKEQwUjcxHimXXWIMjUXOMt 7+4P0aIw1v3VHuB8iBVpcpz+865rhH3bcyHDJhmV/DrUSYloa0XzGZVEJU1KJz+IMZUp NWcOtkOxGq339bB9EnRwEaI0P+mRge+xFUymmFCvE9xukvZyfLv7lXLxF/BNN5ZZfGZM TSnA== 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=tEKqj7qCG9J1lHieBs4DsFs71orOXs50PMq+1Bulhcg=; b=ZHLg+ClFS/IFZZCJi2zPYWOrAsepUhzCD6dgBbMKvyKrZkaekcp/BDaOM2DZ6Eo22D F1IQDa+x9hgf1nDkIkTxyr+2vMb0mZNprauXojkfsujkoCiRUKBs0zr2pL38sTr/ciz7 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X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Nov 2018 05:20:57 -0000 --000000000000fd92e3057a206565 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Apologies for the duplicate. Now with the corrected BFD WG alias. On Thu, Nov 8, 2018 at 12:18 PM Greg Mirsky wrote: > Hi Reshad, > thank you for taking the time to review and sharing your comments, much > appreciated. I'll add to answers by Fangwei, please find them in-line > tagged GIM>>. > > Regards, > Greg > > On Thu, Nov 8, 2018 at 11:27 AM wrote: > >> Hi, Rahman >> >> Thanks for your comments. >> >> Plese see inline marked with[hfw]. >> >> >> >Hi, >> >> >> >> >I just took a quick look at the draft: >> >> >1.Section 1, 2nd paragraph mentions =E2=80=9C=E2=80=A6detect unicast fa= ilures..=E2=80=9D, I >> believe this should be unidirectional? >> >> [hfw] Agree, the BFD multipoint document only defines the unidirectional >> deteck from header to one or more tails. >> > GIM>> Great catch, thank you. Will fix in the next version. > >> >2.Section 1, 3rd paragraph says that active-tail is for further study. >> So when a tail detects a failure, how will the head be notified? If the >> head does not have to be notified, what action is taken? >> >> [hfw] Ok. Actually, we are considering the active-tails solution. It >> will be added in the next version. >> > GIM>> Our plan is to use BFD for Multipoint Network with Active Tail > specfication as the base for this mode. Since tails in p2mp BFD are in th= e > Demand mode the head only can query all tail and/or the particular tail > using the Poll sequence (referred as multicast and unicast Poll). Dependi= ng > on the type of the failure, the head may recieve or not the BFD control > message with Final flag set. Absence of the response in combination with > the content of the Diag field must be used to draw the conclusion on > liveleness of the path from the head to the particular tail. From here th= e > head may use BIER Ping to localize the defect and switch to using the > alternative path through the BIER domain by using different transient BFR= s. > >> >> Regards >> >> Fangwei. >> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*ReshadRahman(rrahman) >> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*draft-hu-bier-bfd@ietf.org ; >> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*bier@ietf.org ;bfd@= ietf.org ; >> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2018=E5=B9=B411=E6=9C=8808=E6=97=A5 11:56 >> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**Feedback on draft-hu-bier-bfd-02* >> >> Hi, >> >> >> >> I just took a quick look at the draft: >> >> 1. >> >> Section 1, 2nd paragraph mentions =E2=80=9C=E2=80=A6detect unicast fa= ilures..=E2=80=9D, I >> believe this should be unidirectional? >> 2. >> >> Section 1, 3rd paragraph says that active-tail is for further study. >> So when a tail detects a failure, how will the head be notified? If = the >> head does not have to be notified, what action is taken? >> >> >> >> Regards, >> >> Reshad. >> >> >> --000000000000fd92e3057a206565 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Apologies for the duplicate.
Now with the corrected BF= D WG alias.

On T= hu, Nov 8, 2018 at 12:18 PM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Reshad,
thank you for taking the time= to review and sharing your=C2=A0comments, much appreciated. I'll add t= o answers by Fangwei, please find them in-line tagged GIM>>.

Regards,
Greg

On Thu, Nov 8, 2018 at 11:27 AM <hu.fangwei@zte.com.cn> wrote:=

Hi, Rahman

Thanks f= or your comments.

Plese se= e inline marked with[hfw].


>Hi,

=C2=A0

>I just took = a quick look at the draft:

>= 1.Section 1, 2nd=C2=A0paragraph mentions =E2=80=9C=E2=80=A6detect unicast failures..=E2=80=9D, I believe this =C2=A0should be unidir= ectional?

[hfw] Agree, the BFD multipoint document only defines the u= nidirectional deteck from header to one or more tails.

GIM>> Great catch, thank you. Will fix in the next version.=C2= =A0

>2.= Section 1, 3rd=C2=A0paragraph says that active-tail is for furth= er study. So when a tail detects a failure, how will the head be notified?= =C2=A0 If the head does not have to be notified, what action is taken?

[hfw] Ok. Actually, we = are considering the active-tails solution. It =C2=A0will be added in the ne= xt version.

GIM>> Our plan is to use BFD f= or Multipoint Network with Active Tail specfication as the base for this mo= de. Since tails in p2mp BFD are in the Demand mode the head only can query = all tail and/or the particular tail using the Poll sequence (referred as mu= lticast and unicast Poll). Depending on the type of the failure, the head m= ay recieve or not the BFD control message with Final flag set. Absence of t= he response in combination with the content of the Diag field must be used = to draw the conclusion on liveleness of the path from the head to the parti= cular tail. From here the head may use BIER Ping to localize the defect and= switch to using the alternative path through the BIER domain by using diff= erent transient BFRs.


Regards

Fangwei.

=E5=8F=91=E4= =BB=B6=E4=BA=BA=EF=BC=9AReshadRahman(rrahman) <rrahman@cisco.com>
=
=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9Adraft= -hu-bier-bfd@ietf.org <draft-hu-bier-bfd@ietf.org>;
=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9Abier@ietf.org <bier@ietf.org>;b= fd@ietf.org <bfd@i= etf.org>;
=E6=97=A5 =E6=9C=9F =EF=BC=9A2018=E5=B9=B411=E6=9C=8808=E6=97=A5 11:56
=E4=B8=BB =E9=A2=98 =EF=BC=9AFeedback on draft-hu-bier-bfd-0= 2

Hi,

=C2=A0

I just took a quick look at the draft:

  1. Section 1, 2nd paragraph mentions =E2=80= =9C=E2=80=A6detect unicas= t failures..=E2=80=9D, I believe this =C2=A0should be unidirectional?

    <= /li>

  2. Section 1, 3rd paragraph says that active-tail is for further study. So when a t= ail detects a failure, how will the head be notified?=C2=A0 If the head doe= s not have to be notified, what action is taken?

=C2=A0

Regards,

Reshad.<= u>


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Date: Thu, 08 Nov 2018 00:33:36 -0800 Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Nov 2018 08:33:36 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Bidirectional Forwarding Detection WG of the IETF. Title : Optimizing BFD Authentication Authors : Mahesh Jethanandani Ashesh Mishra Ankur Saxena Manav Bhatia Filename : draft-ietf-bfd-optimizing-authentication-07.txt Pages : 7 Date : 2018-11-08 Abstract: This document describes an optimization to BFD Authentication as described in Section 6.7 of BFD RFC5880. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-bfd-optimizing-authentication/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-bfd-optimizing-authentication-07 https://datatracker.ietf.org/doc/html/draft-ietf-bfd-optimizing-authentication-07 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-bfd-optimizing-authentication-07 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 Thu Nov 8 00:39:54 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EC6F2130F34 for ; Thu, 8 Nov 2018 00:39:42 -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 eHPmL9fT92yR for ; Thu, 8 Nov 2018 00:39:39 -0800 (PST) Received: from mail-pg1-x533.google.com (mail-pg1-x533.google.com [IPv6:2607:f8b0:4864:20::533]) (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 3EE2C130F29 for ; Thu, 8 Nov 2018 00:39:39 -0800 (PST) Received: by mail-pg1-x533.google.com with SMTP id f8-v6so8567973pgq.5 for ; Thu, 08 Nov 2018 00:39:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=NGrlzicpu3fqRqYKAqiPuEmrSb1WFCo1sFq9Mwfb+9A=; b=ZWRzcQJ4KUydRU3wDr3eeN/WnKa0N49UwGV1mtISm9T8KAZumYmeA5v/6EeBeljHIn mVsOOLQnhLF2jgSNsvv8PK9Tt+b4tjZm1+VpH41A8fU+Gv1wW1lNY38Hm7cOSioHCZfY N7cEj3HGbG1JTmTX/AUF6DrtDRCOnkNP9djPzgai1+QCw1w4p7I9jRK7sIhyuHtDYrkz DmFkBDHjYOV6V9Z6dfMeHQWVow9Mp3llf58vKOAhTaemhxJgAOM1iEj9SS1lqj3i0oZ3 NypDZrferBvKkWyd3v4BNB2V8ETHIKQkBZq73rgbPntEPy/lrpN5EA0H3X1aUajVKZq8 xYVA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=NGrlzicpu3fqRqYKAqiPuEmrSb1WFCo1sFq9Mwfb+9A=; b=N8nw4Ic6+bRabh1bfRByw8FPCLcefZQfOresKgy3e58IFN7VWIViJRAKxaywwBK0rd 2GA+Btsd1TDOj08zxz7KXNZCVmNSEx1TrxZQfXa59OICL7uUIoKQCvDZhATNcJIlZTM2 M5wxQyg+9zQAv7cVcUPY8r50U5gzG1QT/VzWEvH9q5XQi5n3xcy37Zbdv+iT535918yF ctDXgsHbmKq1hdVTVgl+xs4Zrs039ffmnhfGpwiGpNMtjPyxkneFHl7zQBq8l4zJPR4Z IDN9jV9icuZWbv/7W83hafl96z+QH0lzMxOjsv1lNiSmciVwZt5ncve/1jJh+moubRL0 uT1Q== X-Gm-Message-State: AGRZ1gI80nKs5lknkvOEixSVEiWbq365bxt7Xazf0+kA13W8N4lCwocd DbehMcETQM+2CQ8wXmIbCeY9wkgc8fY= X-Google-Smtp-Source: AJdET5c0jGkEA8Pbu4sHipcphdIJel5lG5K/BUig580P4H/yoq5JvQ7hK/SqT1srlDzXHLE1Bgf5pw== X-Received: by 2002:a63:b90a:: with SMTP id z10-v6mr3051508pge.221.1541666378694; Thu, 08 Nov 2018 00:39:38 -0800 (PST) Received: from ?IPv6:2001:67c:370:128:149a:bcbf:c39d:8127? ([2001:67c:370:128:149a:bcbf:c39d:8127]) by smtp.gmail.com with ESMTPSA id v14sm5489689pgf.3.2018.11.08.00.39.36 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 08 Nov 2018 00:39:37 -0800 (PST) From: Mahesh Jethanandani Message-Id: <811C61AA-CE9D-4E2F-8D5D-D2CFED7777E4@gmail.com> Content-Type: multipart/alternative; boundary="Apple-Mail=_7FA1C00A-862E-41A0-9DFE-644D9DADA2DC" Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) Subject: Re: I-D Action: draft-ietf-bfd-optimizing-authentication-06.txt Date: Thu, 8 Nov 2018 15:39:34 +0700 In-Reply-To: <5E580DDD-7504-4E58-B0FC-BA18DF9CE17C@gmail.com> Cc: Greg Mirsky , "rtg-bfd@ietf.org" To: Jeffrey Haas References: <153930035253.7105.12758186259660848661@ietfa.amsl.com> <8FC1854D-DA08-48FB-A291-B293AB1464EF@gmail.com> <20181029161026.GO12336@pfrc.org> <5E580DDD-7504-4E58-B0FC-BA18DF9CE17C@gmail.com> X-Mailer: Apple Mail (2.3445.9.1) Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Nov 2018 08:39:48 -0000 --Apple-Mail=_7FA1C00A-862E-41A0-9DFE-644D9DADA2DC Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi Jeff, Version -07 of the draft addresses this comment. Thanks. > On Oct 30, 2018, at 12:33 AM, Mahesh Jethanandani = wrote: >=20 > Hi Jeff, >=20 >> On Oct 29, 2018, at 9:10 AM, Jeffrey Haas wrote: >>=20 >> Mahesh, >>=20 >> On Mon, Oct 15, 2018 at 09:24:59PM -0700, Greg Mirsky wrote: >>> thank you for your quick response. The comment regarding the state = change, >>> as I understand from the minutes, came from Jeff. >>> Yes, the question was about the periodic authentication in Up state. = I >>> believe that at the meeting WG arrived at a very good solution and = we've >>> agreed to make the appropriate changes in the document. I don't = think that >>> the current version reflects the WG decision that in Up state = authenticated >>> BFD control packets are transmitted periodically in sets of not less = than >>> Detect Multiplier. >>=20 >> I think the text is very close to what we'd likely want. Here's the = text in >> the current draft: >>=20 >> : Most frames transmitted on a BFD session are BFD CC UP frames. >> : Authenticating a small subset of these frames, for example, a = detect >> : multiplier number of packets per configured period, = significantly >> : reduces the computational demand for the system while = maintaining >> : security of the session across the configured authentication = periods. >>=20 >> Given BFD procedures, I believe we'd normally want to transmit at = *least* >> Detect Multiplier number of packets to ensure that the remote site = has seen it. >>=20 >> How about the following text? >>=20 >> Most frames transmitted on a BFD session are BFD CC UP frames. >> Authenticating a small subset of these frames, significantly >> reduces the computational demand for the system while maintaining >> security of the session across the configured authentication periods. >> A minimum of Detect Multiplier packets MUST be transmitted per = configured >> periodic authentication interval. This ensures that the BFD session = should >> see at least one authenticated packet during that interval. >=20 > Ok. Will update and post once the submission window opens up. >=20 >>=20 >> -- Jeff >=20 > Mahesh Jethanandani > mjethanandani@gmail.com Mahesh Jethanandani mjethanandani@gmail.com --Apple-Mail=_7FA1C00A-862E-41A0-9DFE-644D9DADA2DC Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Hi = Jeff,

Version -07 of = the draft addresses this comment. Thanks.

On Oct = 30, 2018, at 12:33 AM, Mahesh Jethanandani <mjethanandani@gmail.com> wrote:

Hi Jeff,

On = Oct 29, 2018, at 9:10 AM, Jeffrey Haas <jhaas@pfrc.org> = wrote:

Mahesh,

On Mon, Oct 15, 2018 at 09:24:59PM -0700, Greg Mirsky = wrote:
thank you for = your quick response. The comment regarding the state change,
as I understand from the minutes, came from Jeff.
Yes, the question was about the periodic authentication in Up = state. I
believe that at the meeting WG arrived at a very = good solution and we've
agreed to make the appropriate = changes in the document. I don't think that
the current = version reflects the WG decision that in Up state authenticated
BFD control packets are transmitted periodically in sets of = not less than
Detect Multiplier.

I think the text is very close to = what we'd likely want.  Here's the text in
the = current draft:

:    Most = frames transmitted on a BFD session are BFD CC UP frames.
: =    Authenticating a small subset of these frames, for = example, a detect
:    multiplier number of = packets per configured period, significantly
: =    reduces the computational demand for the system while = maintaining
:    security of the session = across the configured authentication periods.

Given BFD procedures, I believe we'd normally want to = transmit at *least*
Detect Multiplier number of packets to = ensure that the remote site has seen it.

How = about the following text?

Most frames = transmitted on a BFD session are BFD CC UP frames.
Authenticating a small subset of these frames, = significantly
reduces the computational demand for the = system while maintaining
security of the session across = the configured authentication periods.
A minimum of Detect = Multiplier packets MUST be transmitted per configured
periodic authentication interval.  This ensures that the = BFD session should
see at least one authenticated packet = during that interval.

Ok. Will update and post once the submission window opens = up.


-- Jeff

Mahesh Jethanandani
mjethanandani@gmail.com

Mahesh Jethanandani
mjethanandani@gmail.com



= --Apple-Mail=_7FA1C00A-862E-41A0-9DFE-644D9DADA2DC-- From nobody Thu Nov 8 00:52:21 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0C301130DCC for ; Thu, 8 Nov 2018 00:52:20 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, 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 V6JnjKr5puMh for ; Thu, 8 Nov 2018 00:52:18 -0800 (PST) Received: from slice.pfrc.org (slice.pfrc.org [67.207.130.108]) by ietfa.amsl.com (Postfix) with ESMTP id 980F81293FB for ; Thu, 8 Nov 2018 00:52:18 -0800 (PST) Received: by slice.pfrc.org (Postfix, from userid 1001) id 88E941E4F5; Thu, 8 Nov 2018 03:51:37 -0500 (EST) Date: Thu, 8 Nov 2018 03:51:37 -0500 From: Jeffrey Haas To: rtg-bfd@ietf.org Subject: BFD WG status Message-ID: <20181108085136.GF19684@pfrc.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Nov 2018 08:52:20 -0000 Working Group, As is our custom, the BFD wiki has been updated with current status of the group and known documents. You are encouraged to review it. https://trac.ietf.org/trac/bfd/wiki -- Jeff & Reshad From nobody Thu Nov 8 00:59:07 2018 Return-Path: X-Original-To: rtg-bfd@ietf.org Delivered-To: rtg-bfd@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id E75F8130E83; Thu, 8 Nov 2018 00:59:05 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IETF Secretariat To: , , Subject: The BFD WG has placed draft-chen-bfd-unsolicited in state "Call For Adoption By WG Issued" X-Test-IDTracker: no X-IETF-IDTracker: 6.87.3 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <154166754594.31305.2180321041482955724.idtracker@ietfa.amsl.com> Date: Thu, 08 Nov 2018 00:59:05 -0800 Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Nov 2018 08:59:06 -0000 The BFD WG has placed draft-chen-bfd-unsolicited in state Call For Adoption By WG Issued (entered by Jeffrey Haas) The document is available at https://datatracker.ietf.org/doc/draft-chen-bfd-unsolicited/ Comment: WG adoption call ending 2018-11-09 From nobody Thu Nov 8 01:58:33 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3753B130E46; Thu, 8 Nov 2018 01:58:30 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.4 X-Spam-Level: X-Spam-Status: No, score=-1.4 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EaKBdb77ztfw; Thu, 8 Nov 2018 01:58:28 -0800 (PST) Received: from mail-vs1-f50.google.com (mail-vs1-f50.google.com [209.85.217.50]) (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 B8B9E130E2E; Thu, 8 Nov 2018 01:58:27 -0800 (PST) Received: by mail-vs1-f50.google.com with SMTP id g68so7897474vsd.11; Thu, 08 Nov 2018 01:58:27 -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=yqvVOqiL+VLyLZQG0BnaHgiayZ1B7olom0J0by1RU2c=; b=fKf3aRYJ6+oLdvfRZ2bfNhEflhQdl66l9/UPA20VW1U01W+cPJ9+tYOy6b5aZB1oAF q0QLVt7HyT42Ekq7yqIjZBjH6FdN8yFQBFX/Mv9io7J9lUxoti2gmrHCQxyV47v73bX/ 3tgdWrjz4V6g9vtVLcsvUmE0tlx+PAePSpzVWGEKd4snl6YMDkLraqD6XUQgNJ6t59dP nI6XSX4Iv7JYDgFiU4q5+TLp40KeKD46/MwRZuDlelrDv57O8nMCpDUYvev1peX3zVz3 bEn06IWR+SAgPkjMGZNPeSIgkQGR2mmxEdEjxPiQUfvjdKMiR19tYJH+d04EzWdIW1lc /UyQ== X-Gm-Message-State: AGRZ1gIBhSVBErW13T6qUIlmVBM6oS7UDZcyep8SKIWJ4eSD7RiYhYK4 uBSp7ZsIfZxwOQ0wxEkmZkSx0bg5qV31vkAXiYqmnTxn X-Google-Smtp-Source: AJdET5d+nnGQLDm6sdT2u1ihdUe+9yJu8MIebFJfcUY+/lTlqpcCY/Wzr1+7rN7KgC8dg9+tWpHWQ1Rj0HmSsewCphM= X-Received: by 2002:a67:741:: with SMTP id 62mr1482222vsh.228.1541671106471; Thu, 08 Nov 2018 01:58:26 -0800 (PST) MIME-Version: 1.0 From: Anoop Ghanwani Date: Thu, 8 Nov 2018 01:58:12 -0800 Message-ID: Subject: WGLC comments on draft-ietf-bfd-vxlan To: rtg-bfd@ietf.org, nvo3@ietf.org Content-Type: multipart/alternative; boundary="000000000000a96d41057a2446bd" Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Nov 2018 09:58:30 -0000 --000000000000a96d41057a2446bd Content-Type: text/plain; charset="UTF-8" Here are my comments. Thanks, Anoop == Philosophical Since VXLAN is not an IETF standard, should we be defining a standard for running BFD on it? Should we define BFD over Geneve instead which is the official WG selection? Is that going to be a separate document? Technical Section 1: This part needs to be rewritten: >>> The individual racks may be part of a different Layer 3 network, or they could be in a single Layer 2 network. The VXLAN segments/overlays are overlaid on top of Layer 3 network. A VM can communicate with another VM only if they are on the same VXLAN segment. >>> It's hard to parse and, given IRB, the last sentence above is wrong. Section 3: >>> Most deployments will have VMs with only L2 capabilities that may not support L3. >>> Are you suggesting most deployments have VMs with no IP addresses/configuration? >>> Having a hierarchical OAM model helps localize faults though it requires additional consideration. >>> What are the additional considerations? Would be useful to add a reference to RFC 8293 in case the reader would like to know more about service nodes. Section 4 >>> Separate BFD sessions can be established between the VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200). >>> IMO, the document should mention that this could lead to scaling issues given that VTEPs can support well in excess of 4K VNIs. Additionally, we should mention that with IRB, a given VNI may not even exist on the destination VTEP. Finally, what is the benefit of doing this? There may be certain corner cases where it's useful (vs a single BFD session between the VTEPs for all VNIs) but it would be good to explain what those are. Sections 5.1 and 6.1 In 5.1 we have >>> The inner MAC frame carrying the BFD payload has the following format: ... Source IP: IP address of the originating VTEP. Destination IP: IP address of the terminating VTEP. >>> In 6.1 we have >>> Since multiple BFD sessions may be running between two VTEPs, there needs to be a mechanism for demultiplexing received BF packets to the proper session. The procedure for demultiplexing packets with Your Discriminator equal to 0 is different from[RFC5880 ]. *For such packets, the BFD session MUST be identified* *using the inner headers, i.e., the source IP and the destination IP present in the IP header carried by the payload of the VXLAN* *encapsulated packet.* >>> How does this work if the source IP and dest IP are the same as specified in 5.1? Editorial - Terminology section should be renamed to acronyms. - Document would benefit from a thorough editorial scrub, but maybe that will happen once it gets to the RFC editor. Section 1 >>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348 ]. provides an encapsulation scheme that allows virtual machines (VMs) to communicate in a data center network. >>> This is not accurate. VXLAN allows you to implement an overlay to decouple the address space of the attached hosts from that of the network. Section 7 VTEP's -> VTEPs --000000000000a96d41057a2446bd Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Here are my comments.

Th= anks,
Anoop

=3D=3D

<= div>Philosophical

Since VXLAN is not an IETF stand= ard, should we be defining a standard for running BFD on it?=C2=A0 Should w= e define BFD over Geneve instead which is the official WG selection?=C2=A0 = Is that going to be a separate document?

Techn= ical

Section 1:

This part= needs to be rewritten:
>>>
Th= e individual racks may be part of a different Layer 3 network, or they could be in a single Layer 2 network. The VXLAN segments/overlays are overlaid on top of Layer 3 network. A VM can communicate with another VM only if they are on the same VXLAN segment.
>>>
It's hard t= o parse and, given IRB, the last sentence above is wrong.

Section 3:
>>>
=C2=A0M= ost deployments will have VMs with only L2 capabilities that
may not support L3.
>>>
Are you= suggesting most deployments have VMs with no IP addresses/configuration?

>>>
Having a hie= rarchical OAM model helps localize faults though it requires additional consideration.
&g= t;>>
What are the additional considerations?

=
Would be useful to add a reference to RFC 8293 in case the reade= r would like to know more about service nodes.

Sec= tion 4
>>>
Separate BFD sessions can be established between the VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200).
>>>
IMO, the document should mention that this could l= ead to scaling issues given that VTEPs can support well in excess of 4K VNI= s.=C2=A0 Additionally, we should mention that with IRB, a given VNI may not= even exist on the destination VTEP.=C2=A0 Finally, what is the benefit of = doing this?=C2=A0 There may be certain corner cases where it's useful (= vs a single BFD session between the VTEPs for all VNIs) but it would be goo= d to explain what those are.

Sections 5.1 and 6.1<= /div>

In 5.1 we have
>>>
The inner MAC frame carrying the BFD payload has the
following format:
... Source IP: IP address of the originating VTEP. Destination IP: IP address of the terminating VTEP.
>>>

In 6.1 we have=C2=A0
>>>
Since multiple BFD s=
essions may be running between two
VTEPs, there needs to be a mechanism for demultiplexing received BF
pack= ets to the proper session. The procedure for demultiplexing packets with Your Discriminator equal to 0 is different from[RFC5880]. 
For such packets, th=
e BFD session MUST be identified
using the inner heade=
rs, i.e., the source IP and the destination IP
present in the IP header carried by the payload of the VXLAN
encapsulated packet.

>>>
= How does this work if the source IP and dest IP are the same as specified i= n 5.1?

Editorial

- Termin= ology section should be renamed to acronyms.
- Document would ben= efit from a thorough editorial scrub, but maybe that will happen once it ge= ts to the RFC editor.

Section 1
>>= >
"Virtual eXtensible Local Area Network&= quot; (VXLAN) [RFC7348]. provides an encapsulation scheme that allows virtual machines (VMs) to communicate in a data center network.
>>>
This is not accurate.=C2=A0 VXLAN allows you to implement an overlay= to decouple the address space of the attached hosts from that of the netwo= rk.

Section 7

VTEP's -> VTEPs

--000000000000a96d41057a2446bd-- From nobody Thu Nov 8 17:50:51 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 25D20124D68; Thu, 8 Nov 2018 17:50:43 -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 jopMkb5D0WFR; Thu, 8 Nov 2018 17:50:40 -0800 (PST) Received: from mail-lj1-x230.google.com (mail-lj1-x230.google.com [IPv6:2a00:1450:4864:20::230]) (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 4AA9F1252B7; Thu, 8 Nov 2018 17:50:40 -0800 (PST) Received: by mail-lj1-x230.google.com with SMTP id x85-v6so249827ljb.2; Thu, 08 Nov 2018 17:50:39 -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=838sm7dRYMIPmzEaK/0Ix+SGyvN8cyrweqOHpODnXdY=; b=JNkB7QZHtgCLRwbRDJ9FgULFOG7pU4XRb9bKEjT9sqfg6B21GpoqBxMKq3gxrWKNo5 NLMYbPsa5BcUpMMZFh3E9Yqwd5HPuDdJXb/bXVE8qkxw/n0p9swqxG8FYZ8P4AtrjdH3 tIuOS5yLrlCKkJEVeTC/cTfVer6m9qcN4aerzjGwnwtnBaigirEIV4Pamy8mwBET4hhY qAzdhM3/qliWFvSjbCODXxlsfo3szQga8K5PQkMPnXQPYL8RKycpYAWehEJ7N7sWtxTP xLDyk0xvVzyxusQqDkFITKqm4sgUy+Ljp0gQm0ie1jTuxbk5LRTzCiWg0hSaUZbfBQ9+ C4lg== 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=838sm7dRYMIPmzEaK/0Ix+SGyvN8cyrweqOHpODnXdY=; b=idi32E6fq9M33VPfZDT/Gyct0tzVKWlGjcz9NxJQwuXWT2C3E1QhtYKpawVOVmfsKy npUji4bFCav1ETOmeq7cb1ELX3E01wY9xv8BkxDxI70lewj/l8WnfZnsbmVUV49M3RMb eFA4cxQrwffHADargm6Fico62FHQUeXN7PVrr7OPnuXYKHWTp8/TOZytmplShqXGv78u pGqfwIRu9Z4Vl5gGpsQ25MhJHNbBvIdvIANYAO0zGx90WDjDNVXjYCL5OfHL4ggaPGz8 rIz2FfO9Hz4hGLYG4rLkJq0vlvnXJkRtd0rtPsuuwoktdbRs3qeHMOulAM/ODVGTJtxZ B84Q== X-Gm-Message-State: AGRZ1gJqzGrbn29em0Psd6DK/qYwjSHTOASIwDTfp+1gTsiPq5kI1kXf mWJ58L2LXjsJmprxVKnYhAlBTQcE30PScdikXF0= X-Google-Smtp-Source: AJdET5f7ctjaZ74gEf0qJcEcmRs8HdrX7Gk3Mr2SamOCsA+oHqUPpRtn42vlKvCe7iPQUamfjf4AONhUXj41Q2NNYng= X-Received: by 2002:a2e:484:: with SMTP id a4-v6mr4235402ljf.27.1541728237697; Thu, 08 Nov 2018 17:50:37 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Greg Mirsky Date: Fri, 9 Nov 2018 08:50:27 +0700 Message-ID: Subject: Re: WGLC comments on draft-ietf-bfd-vxlan To: Anoop Ghanwani Cc: rtg-bfd WG , NVO3 Content-Type: multipart/alternative; boundary="000000000000f2c156057a3193d2" Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 09 Nov 2018 01:50:43 -0000 --000000000000f2c156057a3193d2 Content-Type: text/plain; charset="UTF-8" Hi Anoop, thank you for your thorough review and the comments. I'm traveling over the weekend and will respond in details later next week. Regards, Greg On Thu, Nov 8, 2018 at 4:58 PM Anoop Ghanwani wrote: > > Here are my comments. > > Thanks, > Anoop > > == > > Philosophical > > Since VXLAN is not an IETF standard, should we be defining a standard for > running BFD on it? Should we define BFD over Geneve instead which is the > official WG selection? Is that going to be a separate document? > > Technical > > Section 1: > > This part needs to be rewritten: > >>> > The individual racks may be part of a different Layer 3 network, or they > could be in a single Layer 2 network. The VXLAN segments/overlays are > overlaid on top of Layer 3 network. A VM can communicate with another VM > only if they are on the same VXLAN segment. > >>> > It's hard to parse and, given IRB, the last sentence above is wrong. > > Section 3: > >>> > Most deployments will have VMs with only L2 capabilities that > may not support L3. > >>> > Are you suggesting most deployments have VMs with no IP > addresses/configuration? > > >>> > Having a hierarchical OAM model helps localize faults though it requires > additional consideration. > >>> > What are the additional considerations? > > Would be useful to add a reference to RFC 8293 in case the reader would > like to know more about service nodes. > > Section 4 > >>> > Separate BFD sessions can be established between the VTEPs (IP1 and IP2) > for monitoring each of the VXLAN tunnels (VNI 100 and 200). > >>> > IMO, the document should mention that this could lead to scaling issues > given that VTEPs can support well in excess of 4K VNIs. Additionally, we > should mention that with IRB, a given VNI may not even exist on the > destination VTEP. Finally, what is the benefit of doing this? There may > be certain corner cases where it's useful (vs a single BFD session between > the VTEPs for all VNIs) but it would be good to explain what those are. > > Sections 5.1 and 6.1 > > In 5.1 we have > >>> > The inner MAC frame carrying the BFD payload has the > following format: > ... Source IP: IP address of the originating VTEP. Destination IP: IP > address of the terminating VTEP. > >>> > > In 6.1 we have > >>> > > Since multiple BFD sessions may be running between two > VTEPs, there needs to be a mechanism for demultiplexing received BF > > packets to the proper session. The procedure for demultiplexing > packets with Your Discriminator equal to 0 is different from[RFC5880 ]. > > *For such packets, the BFD session MUST be identified* > > *using the inner headers, i.e., the source IP and the destination IP > present in the IP header carried by the payload of the VXLAN* > > *encapsulated packet.* > > > >>> > How does this work if the source IP and dest IP are the same as specified > in 5.1? > > Editorial > > - Terminology section should be renamed to acronyms. > - Document would benefit from a thorough editorial scrub, but maybe that > will happen once it gets to the RFC editor. > > Section 1 > >>> > "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348 > ]. provides an encapsulation scheme > that allows virtual machines (VMs) to communicate in a data center network. > >>> > This is not accurate. VXLAN allows you to implement an overlay to > decouple the address space of the attached hosts from that of the network. > > Section 7 > > VTEP's -> VTEPs > > --000000000000f2c156057a3193d2 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Anoop,
thank you for your thorough review and the c= omments. I'm traveling over the weekend and will respond in details lat= er next week.

Regards,
Greg
<= br>
On Thu, Nov 8, 2018 at 4:58 = PM Anoop Ghanwani <anoop@alumni= .duke.edu> wrote:

Here are my comments.

Thanks,
Anoop

=3D=3D

Phil= osophical

Since VXLAN is not an IETF standard, sho= uld we be defining a standard for running BFD on it?=C2=A0 Should we define= BFD over Geneve instead which is the official WG selection?=C2=A0 Is that = going to be a separate document?

Technical

Section 1:

This part needs t= o be rewritten:
>>>
The individual racks may be part of a different Layer 3 network, or they could be in a single Layer 2 network. The VXLAN segments/overlays are overlaid on top of Layer 3 network. A VM can communicate with another VM only if they are on the same VXLAN segment.
>>>
It's hard t= o parse and, given IRB, the last sentence above is wrong.

Section 3:
>>>
=C2=A0Most deployments will have VMs with only L2 capabilities thatmay not support L3.
>>>
Are you suggesting most deployments have VMs with no IP addresses/config= uration?

>>>
Having a hierarchical OAM model helps localize faults though it requires additional consideration.
&g= t;>>
What are the additional considerations?

=
Would be useful to add a reference to RFC 8293 in case the reade= r would like to know more about service nodes.

Sec= tion 4
>>>
Separate BFD sessions can be established between the VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200).
>>>
IMO, the document should mention that this could l= ead to scaling issues given that VTEPs can support well in excess of 4K VNI= s.=C2=A0 Additionally, we should mention that with IRB, a given VNI may not= even exist on the destination VTEP.=C2=A0 Finally, what is the benefit of = doing this?=C2=A0 There may be certain corner cases where it's useful (= vs a single BFD session between the VTEPs for all VNIs) but it would be goo= d to explain what those are.

Sections 5.1 and 6.1<= /div>

In 5.1 we have
>>>
The inner MAC frame carrying the BFD payload has the
following format:
... Source IP: IP address of the originating VTEP. Destination IP: IP address of the terminating VTEP.
>>>

In 6.1 we have=C2=A0
>>>
Since multiple BFD sessions may be running between tw=
o
VTEPs, there needs to be a mechanism for demultiplexing received BF
packets to the proper session. The procedure for demultip= lexing packets with Your Discriminator equal to 0 is different from[RFC5880].
For such packets, the BFD session MUST be identified= 
using the inner headers, i.e., the s=
ource IP and the destination IP
present in the IP header carried by the payload of the VXLAN
encapsulated packet.

&g= t;>>
How does this work if the source IP and dest IP are th= e same as specified in 5.1?

Editorial
- Terminology section should be renamed to acronyms.
- Document would benefit from a thorough editorial scrub, but maybe that w= ill happen once it gets to the RFC editor.

Section= 1
>>>
"Virtual eXte= nsible Local Area Network" (VXLAN) [RFC7348]. provi= des an encapsulation scheme that allows virtual machines (VMs) to communicate in a data center network.
>>>
This is not accurate.=C2=A0 VXLAN allows you to implement an overlay= to decouple the address space of the attached hosts from that of the netwo= rk.

Section 7

VTEP's -> VTEPs

--000000000000f2c156057a3193d2-- From nobody Thu Nov 8 17:51:28 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 437111252B7; Thu, 8 Nov 2018 17:51:16 -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 JOES5JlH9CVs; Thu, 8 Nov 2018 17:51:13 -0800 (PST) Received: from mail-lf1-x133.google.com (mail-lf1-x133.google.com [IPv6:2a00:1450:4864:20::133]) (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 DCD6F124D68; Thu, 8 Nov 2018 17:51:12 -0800 (PST) Received: by mail-lf1-x133.google.com with SMTP id f23so167773lfc.13; Thu, 08 Nov 2018 17:51:12 -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=bpPX8orBwszJN7FMmMoi4z6SpatbOzqWzbiTt5q8gvc=; b=IetMboJxExZREsjFaXAzGPnFvRUl+zp+MLi+ONWtPKYLEykyatFF2EzwYLeRDXbcvc pRLdkhBK+mu78zFEQIW8hnvNZMIeU7aUf+elc4Gw0mwtUbEAB3xr1jJsL+1O5j5apauR u8+3j800gyQ2TNHlM8ebG3c4l7Wu93E/gIE7FlAo0zKu3oChF0dZrBZTKCE7mblsZ2/1 0g/+OMfiBaCWznQQSvxW4cSACUvEuiCrIL7kuY7Hpmw/vnVZjrRpxIt7zCoIYtmsoHJm baatTSoSI6tgOgyj5BjFDAaWxpyHeH5ELKxG2SLfXAPOnYjEn5SFrt/Db/8HbsvFsUUH AuNg== 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=bpPX8orBwszJN7FMmMoi4z6SpatbOzqWzbiTt5q8gvc=; b=tE7cxsgZhsGySuDVCZ7nJdnhXp1P8kpQKOnCz2D8YBpbQFKapnRpZi7C2L/URmM0vg Txk27NfP5ZUb61ID6lkJ+GPrcCxxQ8DOZwojLn6nh8u48/y6/jUuyhtcGYjEKrsVK/UJ t/uaXurmAfByMv5TVUNhPt6jZAgNDyt/1CgoQqATRqeWueVpZtF/nGooZ3aPGT3P7kKo pV0Ex7uvC4/IsAWxDyC0kI87sE4/RRhAD4EV1l5UU9QsuDzrTG729Chusy5sP4p7OaxJ 6hB9BWqfOB2aOIDSuHUa9AO3aIkqLAyDgwzdka2tOF/yuV/E4zgLtgSqmPNM6jvbe8jI ttuw== X-Gm-Message-State: AGRZ1gKtXb6VkzBodsakMuBA2KLooTUu2tgs02wjqpOVDHEtiFmv0r0I STfkqhRF/wnUb44mn5TvlHAZbrFrOYurXCADGAw5Bl4T X-Google-Smtp-Source: AJdET5f8QlrVXuTAcpw1eOdfUxh2btYBvRpE7+xxOAQiNHRCeucIH+jW4xxoDeEjSPY/D0g6DJ2dmJbWvM52boBnTGQ= X-Received: by 2002:a19:4c02:: with SMTP id z2-v6mr4038052lfa.48.1541728270842; Thu, 08 Nov 2018 17:51:10 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Greg Mirsky Date: Fri, 9 Nov 2018 08:50:59 +0700 Message-ID: Subject: Re: WGLC comments on draft-ietf-bfd-vxlan To: Anoop Ghanwani Cc: rtg-bfd WG , NVO3 Content-Type: multipart/alternative; boundary="000000000000ec80a1057a3195dd" Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 09 Nov 2018 01:51:16 -0000 --000000000000ec80a1057a3195dd Content-Type: text/plain; charset="UTF-8" Hi Anoop, thank you for your thorough review and the comments you've shared. Please find my answers below tagged GIM>>. Regards, Greg On Thu, Nov 8, 2018 at 4:58 PM Anoop Ghanwani wrote: > > Here are my comments. > > Thanks, > Anoop > > == > > Philosophical > > Since VXLAN is not an IETF standard, should we be defining a standard for > running BFD on it? Should we define BFD over Geneve instead which is the > official WG selection? Is that going to be a separate document? > > Technical > > Section 1: > > This part needs to be rewritten: > >>> > The individual racks may be part of a different Layer 3 network, or they > could be in a single Layer 2 network. The VXLAN segments/overlays are > overlaid on top of Layer 3 network. A VM can communicate with another VM > only if they are on the same VXLAN segment. > >>> > It's hard to parse and, given IRB, the last sentence above is wrong. > > Section 3: > >>> > Most deployments will have VMs with only L2 capabilities that > may not support L3. > >>> > Are you suggesting most deployments have VMs with no IP > addresses/configuration? > > >>> > Having a hierarchical OAM model helps localize faults though it requires > additional consideration. > >>> > What are the additional considerations? > > Would be useful to add a reference to RFC 8293 in case the reader would > like to know more about service nodes. > > Section 4 > >>> > Separate BFD sessions can be established between the VTEPs (IP1 and IP2) > for monitoring each of the VXLAN tunnels (VNI 100 and 200). > >>> > IMO, the document should mention that this could lead to scaling issues > given that VTEPs can support well in excess of 4K VNIs. Additionally, we > should mention that with IRB, a given VNI may not even exist on the > destination VTEP. Finally, what is the benefit of doing this? There may > be certain corner cases where it's useful (vs a single BFD session between > the VTEPs for all VNIs) but it would be good to explain what those are. > > Sections 5.1 and 6.1 > > In 5.1 we have > >>> > The inner MAC frame carrying the BFD payload has the > following format: > ... Source IP: IP address of the originating VTEP. Destination IP: IP > address of the terminating VTEP. > >>> > > In 6.1 we have > >>> > > Since multiple BFD sessions may be running between two > VTEPs, there needs to be a mechanism for demultiplexing received BF > > packets to the proper session. The procedure for demultiplexing > packets with Your Discriminator equal to 0 is different from[RFC5880 ]. > > *For such packets, the BFD session MUST be identified* > > *using the inner headers, i.e., the source IP and the destination IP > present in the IP header carried by the payload of the VXLAN* > > *encapsulated packet.* > > > >>> > How does this work if the source IP and dest IP are the same as specified > in 5.1? > > Editorial > > - Terminology section should be renamed to acronyms. > - Document would benefit from a thorough editorial scrub, but maybe that > will happen once it gets to the RFC editor. > > Section 1 > >>> > "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348 > ]. provides an encapsulation scheme > that allows virtual machines (VMs) to communicate in a data center network. > >>> > This is not accurate. VXLAN allows you to implement an overlay to > decouple the address space of the attached hosts from that of the network. > > Section 7 > > VTEP's -> VTEPs > > --000000000000ec80a1057a3195dd Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Anoop,
thank you for your thorough review and the c= omments you've shared. Please find my answers below tagged GIM>>.=

Regards,
Greg

On Thu, Nov 8, 2018 at 4:58 PM Anoop Ghan= wani <anoop@alumni.duke.edu= > wrote:

Here are my comments.

Thanks,
Anoop

=3D=3D

Philosophical
=

Since VXLAN is not an IETF standard, should we be defin= ing a standard for running BFD on it?=C2=A0 Should we define BFD over Genev= e instead which is the official WG selection?=C2=A0 Is that going to be a s= eparate document?

Technical

Section 1:

This part needs to be rewritten:=
>>>
The individual racks may be part of a different Layer 3 network, or they could be in a single Layer 2 network. The VXLAN segments/overlays are overlaid on top of Layer 3 network. A VM can communicate with another VM only if they are on the same VXLAN segment.
>>>
It's hard t= o parse and, given IRB, the last sentence above is wrong.

Section 3:
>>>
=C2=A0Most deployments will have VMs with only L2 capabilities thatmay not support L3.
>>>
Are you suggesting most deployments have VMs with no IP addresses/config= uration?

>>>
Having a hierarchical OAM model helps localize faults though it requires additional consideration.
&g= t;>>
What are the additional considerations?

=
Would be useful to add a reference to RFC 8293 in case the reade= r would like to know more about service nodes.

Sec= tion 4
>>>
Separate BFD sessions can be established between the VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200).
>>>
IMO, the document should mention that this could l= ead to scaling issues given that VTEPs can support well in excess of 4K VNI= s.=C2=A0 Additionally, we should mention that with IRB, a given VNI may not= even exist on the destination VTEP.=C2=A0 Finally, what is the benefit of = doing this?=C2=A0 There may be certain corner cases where it's useful (= vs a single BFD session between the VTEPs for all VNIs) but it would be goo= d to explain what those are.

Sections 5.1 and 6.1<= /div>

In 5.1 we have
>>>
The inner MAC frame carrying the BFD payload has the
following format:
... Source IP: IP address of the originating VTEP. Destination IP: IP address of the terminating VTEP.
>>>

In 6.1 we have=C2=A0
>>>
Since multiple BFD sessions may be running between tw=
o
VTEPs, there needs to be a mechanism for demultiplexing received BF
packets to the proper session. The procedure for demultip= lexing packets with Your Discriminator equal to 0 is different from[RFC5880].
For such packets, the BFD session MUST be identified= 
using the inner headers, i.e., the s=
ource IP and the destination IP
present in the IP header carried by the payload of the VXLAN
encapsulated packet.

&g= t;>>
How does this work if the source IP and dest IP are th= e same as specified in 5.1?

Editorial
- Terminology section should be renamed to acronyms.
- Document would benefit from a thorough editorial scrub, but maybe that w= ill happen once it gets to the RFC editor.

Section= 1
>>>
"Virtual eXte= nsible Local Area Network" (VXLAN) [RFC7348]. provi= des an encapsulation scheme that allows virtual machines (VMs) to communicate in a data center network.
>>>
This is not accurate.=C2=A0 VXLAN allows you to implement an overlay= to decouple the address space of the attached hosts from that of the netwo= rk.

Section 7

VTEP's -> VTEPs

--000000000000ec80a1057a3195dd-- From nobody Sat Nov 10 17:37:47 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E57AD128BCC for ; Sat, 10 Nov 2018 17:37:45 -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 KEsH9h0EOJbm for ; Sat, 10 Nov 2018 17:37:44 -0800 (PST) Received: from mail-lf1-x129.google.com (mail-lf1-x129.google.com [IPv6:2a00:1450:4864:20::129]) (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 B3D64127133 for ; Sat, 10 Nov 2018 17:37:43 -0800 (PST) Received: by mail-lf1-x129.google.com with SMTP id v5so3868767lfe.7 for ; Sat, 10 Nov 2018 17:37:43 -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=RP9RVUCckbzODlWUi4UYEw7WOMaLB+G6Lzsg+3asKxI=; b=q8u9FuVkEKDKhzRJaZJVMWBlu0Q81Vg2/eOxLb7AIx4tc9tUTzKPdQonXBaWZ7Gp5I Cf4l1DHGg9SRnZnfBboJiQHg3WQ5CQVKmiMDqxJb2TbQcI0d1PZKOgsFtTUKPqJtmNML 09rYebDKLsVOP29efExsWOvvk5RwPt9OxmdaS8wcbBfvgosLZV5JAM5Z68BlmPRpJcvK ePrszKL2gycOXjl+bVIzLugEBiGJCHiE9dbR1KxXw6f6uu5NRMZpE6wzWthR5Wed5fW8 kF8XLUUYv6ut0cZd7gO4U04iXCNKJTqzJYsKw75QJl4k7XL53KDF5wRE8rhatt8y0bEC CCcA== 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=RP9RVUCckbzODlWUi4UYEw7WOMaLB+G6Lzsg+3asKxI=; b=RLdGDZl2CcMfkyaSUEV0DcT+gK4mNWnzP+zZIEwnBhNPhm7ZV7nX4KijtS01K7uSjs Zc8w8qQyecE9YADcJ7XRRkbzUQQr6lHNeirsSGcDb9TcJwa2s4k0m+d540OP5QUnNPqq /EiYSH1RY5Qt2oLh5UDchi5UW9s5XU4ii+9FEMkzFSuMUJo8MJgdxwagCac5r+5sEXiI 8ixHu+VVEDpKiDQuMj2ZWab5lxSFps4TEGxpc8J4y41eE80TbZuOgAXmjIRWtn1+MnEm b6GDmQogEgxbpHdfRKDBoSqhNW5esUjpK5EDGYVJqMSe8w8JVcBO0qV/CJKM02tWQods 3h2w== X-Gm-Message-State: AGRZ1gIEoZLcd3nde+QPO7mOIvchgKxTMijWjvps0omYxMQNRTVfRQLd EO+mC4Rd8VhZVvKb6ouqsvcSPEwIh9BeZA8ol1wtWCnP X-Google-Smtp-Source: AJdET5dsp/Lj79wgjgA9jHUa9mtreUUazHAfDi/k8N3jSYni8dc6pQD7wgCHc30JPAY6AlbGxWub60tjuL3lPrt7VLY= X-Received: by 2002:a19:c650:: with SMTP id w77mr8646453lff.56.1541900261645; Sat, 10 Nov 2018 17:37:41 -0800 (PST) MIME-Version: 1.0 References: <20181108085136.GF19684@pfrc.org> In-Reply-To: <20181108085136.GF19684@pfrc.org> From: Greg Mirsky Date: Sun, 11 Nov 2018 08:37:31 +0700 Message-ID: Subject: Re: BFD WG status To: Jeffrey Haas Cc: rtg-bfd WG Content-Type: multipart/alternative; boundary="0000000000005fe3f3057a59a140" Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 11 Nov 2018 01:37:46 -0000 --0000000000005fe3f3057a59a140 Content-Type: text/plain; charset="UTF-8" Hi Jeff, thank you for keeping the wiki up to date (I believe the group is only WG with up to date wiki). Couple notes on non-WG drafts related to BFD: - draft-mirsky-bfd-p2mp-vrrp-use-case is in WGAP at RTGWG (please feel free to comment to RTGWG) - draft-ietf-bess-mvpn-fast-failover is to go to WGLC shortly - draft-ietf-pim-bfd-p2mp-use-case use of p2mp BFD (BFD in Multipoint Networks) in PIM-SM over shared Ethernet segments. Regards, Greg On Thu, Nov 8, 2018 at 3:52 PM Jeffrey Haas wrote: > Working Group, > > As is our custom, the BFD wiki has been updated with current status of the > group and known documents. You are encouraged to review it. > > https://trac.ietf.org/trac/bfd/wiki > > -- Jeff & Reshad > > --0000000000005fe3f3057a59a140 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Jeff,
thank you for keeping the=C2= =A0wiki up to date (I believe the group is only WG with up to date wiki). C= ouple notes on non-WG drafts related to BFD:
  • draft-mirsky-bfd-p2mp-vrrp-use-cas= e=C2=A0is in WGAP at RTGWG (please feel free to comment to RTGWG)
  • draft-ietf-bess-m= vpn-fast-failover=C2=A0is to go to WGLC shortly
  • draft-ietf-p= im-bfd-p2mp-use-case use of p2mp BFD (BFD in Multipoint Networks) in PIM-SM= over shared Ethernet segments.
Regards,
Greg
<= /div>

On Thu, Nov 8, 2= 018 at 3:52 PM Jeffrey Haas <jhaas@pfr= c.org> wrote:
Working Group,=

As is our custom, the BFD wiki has been updated with current status of the<= br> group and known documents.=C2=A0 You are encouraged to review it.

https://trac.ietf.org/trac/bfd/wiki

-- Jeff & Reshad

--0000000000005fe3f3057a59a140-- From nobody Tue Nov 13 01:00:04 2018 Return-Path: X-Original-To: rtg-bfd@ietf.org Delivered-To: rtg-bfd@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 8E4B8128BCC for ; Tue, 13 Nov 2018 01:00:02 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit To: Subject: Milestones changed for bfd WG X-Test-IDTracker: no X-IETF-IDTracker: 6.87.3 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <154209960257.23354.15415577112910465952.idtracker@ietfa.amsl.com> Date: Tue, 13 Nov 2018 01:00:02 -0800 From: IETF Secretariat Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Nov 2018 09:00:03 -0000 Changed milestone "Submit BFD for VxLAN to the IESG to be considered as a Proposed Standard", set state to active from review, accepting new milestone. URL: https://datatracker.ietf.org/wg/bfd/about/ From nobody Tue Nov 13 11:35:04 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EC3F1128CB7; Tue, 13 Nov 2018 11:34:53 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.018 X-Spam-Level: X-Spam-Status: No, score=-1.018 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_FONT_FACE_BAD=0.981, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ncz3jA4ogAxw; Tue, 13 Nov 2018 11:34:43 -0800 (PST) Received: from mail-lf1-x12f.google.com (mail-lf1-x12f.google.com [IPv6:2a00:1450:4864:20::12f]) (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 C437B128B14; Tue, 13 Nov 2018 11:34:42 -0800 (PST) Received: by mail-lf1-x12f.google.com with SMTP id u18so9716837lff.10; Tue, 13 Nov 2018 11:34:42 -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=NknxPabRecgeOgzN3INKfZ5VfHXga/G8+xuikKComKc=; b=ZKdsj4HNSC085UJXSaLExpVYZg3hNm6uKVNu1+sQFaLf/efoJ5V5Q+8vRE5NZHB+wN Woozh1omh3aoWUwp/n7vLKUvViUl5EGhh36/hpyoTKsLFLxFmKLdg4SyQ6m/mjHRNH7j gJz6f43gIUGUCS/0dO7Ug7Q7rkHrzF/TKX+wi0ajI1KRDO3tbwXB8umShXKmR7pbmIWh o23frZva4uu6ggV4X99nXr9HQEPOdW6p66IZm6LepAxA7NUOjPNNSUeH18jlZZe85vck IJiqpchsr7qMuwFa8s7wX7R+9xafH4hmhc7PZbe+DxxM9bH2sIKRdYY177aY25aIDFc2 CA9g== 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=NknxPabRecgeOgzN3INKfZ5VfHXga/G8+xuikKComKc=; b=VlvjKVgoGqe04oGTWAFQp0XfaRVvp7fswpFeOYZxcWVBF4PEcpysO96f5M1l5PuBwO I14w/rpWEZAY3Y6mT1lCjwggl0F3KrA+UPo4RAuzNOxdBhcmNHH3CTqaVqyuPpLFUVG9 hB5XUrFomjsCUKxMVTZycXrwYA7ABy5vk21KtRcuhNXaamIqu43rOCbJCPYhYUfCxx+H 9v8yIKY8RV3NduHisJC2oSFHDAPHAYcyktZNHIZpn+5elt52pBSA8DDTu9rTPA6hKiDv X6C1igrWYfR+9U7UYsOj+GVMzrx5s+yDjp1gv14CTOPmD/8nwtSsdgq7CCm4BFfsbGa+ KQGw== X-Gm-Message-State: AGRZ1gLaKRJyaqKW+dzDT8OIcbKdETHRfO3k1hwubroILeIzsT6TRoQQ l6pGxCIedaxjxafkNIbv3kXVVnjKOUnwbnEfMyBb9/n6 X-Google-Smtp-Source: AJdET5c4RXkAvoR9ZbqO/lh/yBqbX0qL99V/0a6KMmM1KB6NRyoPfQqmNl0T/GJSFLRvGATOSjD+WENbYryG21ioeJc= X-Received: by 2002:a19:a149:: with SMTP id k70mr3601008lfe.5.1542137680733; Tue, 13 Nov 2018 11:34:40 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Greg Mirsky Date: Tue, 13 Nov 2018 11:34:30 -0800 Message-ID: Subject: Re: WGLC comments on draft-ietf-bfd-vxlan To: Anoop Ghanwani Cc: rtg-bfd WG , NVO3 Content-Type: multipart/alternative; boundary="000000000000a7ac7a057a90e83b" Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Nov 2018 19:34:54 -0000 --000000000000a7ac7a057a90e83b Content-Type: text/plain; charset="UTF-8" Hi Anoop, many thanks for the thorough review and detailed comments. Please find my answers, this time for real, in-line tagged GIM>>. Regards, Greg On Thu, Nov 8, 2018 at 1:58 AM Anoop Ghanwani wrote: > > Here are my comments. > > Thanks, > Anoop > > == > > Philosophical > > Since VXLAN is not an IETF standard, should we be defining a standard for > running BFD on it? Should we define BFD over Geneve instead which is the > official WG selection? Is that going to be a separate document? > GIM>> IS-IS is not on the Standard track either but that had not prevented > IETF from developing tens of standard track RFCs using RFC 1142 as the > normative reference until RFC 7142 re-classified it as historical. A > similar path was followed with IS-IS-TE by publishing RFC 3784 until it was > obsoleted by RFC 5305 four years later. I understand that Down Reference, > i.e., using informational RFC as the normative reference, is not an unusual > situation. > > > Technical > > Section 1: > > This part needs to be rewritten: > >>> > The individual racks may be part of a different Layer 3 network, or they > could be in a single Layer 2 network. The VXLAN segments/overlays are > overlaid on top of Layer 3 network. A VM can communicate with another VM > only if they are on the same VXLAN segment. > >>> > It's hard to parse and, given IRB, > GIM>> Would the following text be acceptable: OLD TEXT: VXLAN is typically deployed in data centers interconnecting virtualized hosts, which may be spread across multiple racks. The individual racks may be part of a different Layer 3 network, or they could be in a single Layer 2 network. The VXLAN segments/overlays are overlaid on top of Layer 3 network. NEW TEXT: VXLAN is typically deployed in data centers interconnecting virtualized hosts of a tenant. VXLAN addresses requirements of the Layer 2 and Layer 3 data center network infrastructure in the presence of VMs in a multi-tenant environment, discussed in section 3 [RFC7348], by providing Layer 2 overlay scheme on a Layer 3 network. A VM can communicate with another VM only if they are on the same VXLAN segment. > > the last sentence above is wrong. > GIM>> Section 4 in RFC 7348 states: Only VMs within the same VXLAN segment can communicate with each other. Section 3: > >>> > Most deployments will have VMs with only L2 capabilities that > may not support L3. > >>> > Are you suggesting most deployments have VMs with no IP > addresses/configuration? > GIM>> Would re-word as follows: OLD TEXT: Most deployments will have VMs with only L2 capabilities that may not support L3. NEW TEXT: Deployments may have VMs with only L2 capabilities that do not support L3. > > >>> > Having a hierarchical OAM model helps localize faults though it requires > additional consideration. > >>> > What are the additional considerations? > GIM>> For example, coordination of BFD intervals across the OAM layers. > > Would be useful to add a reference to RFC 8293 in case the reader would > like to know more about service nodes. > GIM>> I have to admit that I don't find how RFC 8293 A Framework for Multicast in Network Virtualization over Layer 3 is related to this document. Please help with additional reference to the text of the document. > > Section 4 > >>> > Separate BFD sessions can be established between the VTEPs (IP1 and IP2) > for monitoring each of the VXLAN tunnels (VNI 100 and 200). > >>> > IMO, the document should mention that this could lead to scaling issues > given that VTEPs can support well in excess of 4K VNIs. Additionally, we > should mention that with IRB, a given VNI may not even exist on the > destination VTEP. Finally, what is the benefit of doing this? There may > be certain corner cases where it's useful (vs a single BFD session between > the VTEPs for all VNIs) but it would be good to explain what those are. > GIM>> Will add text in the Security Considerations section that VTEPs should have limit on number of BFD sessions. > > Sections 5.1 and 6.1 > > In 5.1 we have > >>> > The inner MAC frame carrying the BFD payload has the > following format: > ... Source IP: IP address of the originating VTEP. Destination IP: IP > address of the terminating VTEP. > >>> > > In 6.1 we have > >>> > > Since multiple BFD sessions may be running between two > VTEPs, there needs to be a mechanism for demultiplexing received BF > > packets to the proper session. The procedure for demultiplexing > packets with Your Discriminator equal to 0 is different from[RFC5880 ]. > > *For such packets, the BFD session MUST be identified* > > *using the inner headers, i.e., the source IP and the destination IP > present in the IP header carried by the payload of the VXLAN* > > *encapsulated packet.* > > > >>> > How does this work if the source IP and dest IP are the same as specified > in 5.1? > GIM>> You're right, Destination and source IP addresses likely are the same in this case. Will add that the source UDP port number, along with the pair of IP addresses, MUST be used to demux received BFD control packets. Would you agree that will be sufficient? > > Editorial > > - Terminology section should be renamed to acronyms. > GIM>> Accepted > - Document would benefit from a thorough editorial scrub, but maybe that > will happen once it gets to the RFC editor. > GIM>> Will certainly have helpful comments from ADs and RFC editor. > > Section 1 > >>> > "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348 > ]. provides an encapsulation scheme > that allows virtual machines (VMs) to communicate in a data center network. > >>> > This is not accurate. VXLAN allows you to implement an overlay to > decouple the address space of the attached hosts from that of the network. > GIM>> Thank you for the suggested text. Will change as follows: OLD TEXT: "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. provides an encapsulation scheme that allows virtual machines (VMs) to communicate in a data center network. NEW TEXT: "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. provides an encapsulation scheme that allows building an overlay network by decoupling the address space of the attached virtual hosts from that of the network. > > Section 7 > > VTEP's -> VTEPs > GIM>> Yes, thank you. --000000000000a7ac7a057a90e83b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Anoop,
many thanks for the thor= ough review and detailed comments. Please find my answers, this time for re= al, in-line tagged GIM>>.

Regards,
Greg

On Thu, Nov 8, 2= 018 at 1:58 AM Anoop Ghanwani <= anoop@alumni.duke.edu> wrote:

Here are my comments.
<= div>
Thanks,
Anoop

=3D=3D<= /div>

Philosophical

Since VXLAN= is not an IETF standard, should we be defining a standard for running BFD = on it?=C2=A0 Should we define BFD over Geneve instead which is the official= WG selection?=C2=A0 Is that going to be a separate document?
GIM>> IS-IS is not on the Standar= d track either but that had not prevented IETF from developing tens of stan= dard track RFCs using RFC 1142 as the normative reference until RFC 7142 re= -classified it as historical. A similar path was followed with IS-IS-TE by = publishing RFC 3784 until it was obsoleted by RFC 5305 four years later. I = understand that Down Reference, i.e., using informational RFC as the normat= ive reference, is not an unusual situation.
=C2=A0
<= div dir=3D"ltr">

Technical

Section 1:

This part needs to be = rewritten:
>>>
The individual racks may be part of a different Layer 3 network, or they could be in a single Layer 2 network. The VXLAN segments/overlays are overlaid on top of Layer 3 network. A VM can communicate with another VM only if they are on the same VXLAN segment.
>>>
It's hard t= o parse and, given IRB,
GIM>> Would the= following text be acceptable:
OLD TEXT:
=C2=A0 = =C2=A0VXLAN is typically deployed in data centers interconnecting
=C2=A0 =C2=A0virtualized hosts, which may be spread across multiple racks.= =C2=A0 The
=C2=A0 =C2=A0individual racks may be part of a differe= nt Layer 3 network, or they
=C2=A0 =C2=A0could be in a single Lay= er 2 network.=C2=A0 The VXLAN segments/overlays
=C2=A0 =C2=A0are = overlaid on top of Layer 3 network.
NEW TEXT:
VXLAN is typically deployed in data centers interconnect= ing virtualized=C2=A0
hosts of a tenant. VX= LAN addresses requirements of the Layer 2 and=C2=A0
Layer 3 data center network infrastructure in the presence of VMs = in=C2=A0
a multi-tenant environment, discus= sed in section 3 [RFC7348], by
=C2=A0provid= ing Layer 2 overlay scheme on a Layer 3 network.

=C2=A0A VM can communicate with a= nother VM only if they are on the same
VXL= AN segment.
the last sentence above is wrong.
<= div>GIM>> Section 4 in RFC 7348 states:
Only VMs within the= same VXLAN segment can communicate with=C2=A0each other.
<= div>Section 3:
>>>
=C2=A0= Most deployments will have VMs with only L2 capabilities that
<= span style=3D"color:rgb(0,0,0);font-family:monospace;font-size:13.3333px;wh= ite-space:pre-wrap">may not support L3.
>>>
A= re you suggesting most deployments have VMs with no IP addresses/configurat= ion?
GIM>> Would re-word as follows:
OLD TEXT:
=C2=A0Most deployments will have VMs with only L= 2 capabilities that
=C2=A0may not support L3.
NEW TEXT:=
Deployments may have VMs with only L2 capabilities that do not s= upport L3.

>>>
Having a hierarchical OAM model helps localize faults though it requires additional consideration.
&g= t;>>
What are the additional considerations?
GIM>> For example, coordinat= ion of BFD intervals across the OAM layers.=C2=A0=C2=A0

=
Would be useful to add a reference to RFC 8293 in case the reader woul= d like to know more about service nodes.
GIM>> I have to admit that I don't find how R= FC 8293=C2=A0=C2=A0A Framework for Multicast in Network Virtualization over= Layer 3 is related to this document. Please help with additional reference= to the text of the document.=C2=A0=C2=A0

Section 4=
>>>
Separate BFD sessions can be established between the VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200).
>>>
IMO, the document should mention that this could l= ead to scaling issues given that VTEPs can support well in excess of 4K VNI= s.=C2=A0 Additionally, we should mention that with IRB, a given VNI may not= even exist on the destination VTEP.=C2=A0 Finally, what is the benefit of = doing this?=C2=A0 There may be certain corner cases where it's useful (= vs a single BFD session between the VTEPs for all VNIs) but it would be goo= d to explain what those are.
GIM>> Will add text in the Security Considerations section th= at VTEPs should have limit on number of BFD sessions.=C2=A0

Sections 5.1 and 6.1

In 5.1 we have
=
>>>
The inner MAC frame carryi= ng the BFD payload has the
following format:<= br class=3D"gmail-m_2120889048547072597gmail-Apple-interchange-newline">... Source IP: IP address of the originating VTEP. Destination IP: IP address of the terminating VTEP.
>>= >

In 6.1 we have=C2=A0
>>>
Since multiple BFD sessions may be runnin=
g between two
VTEPs, there needs to be a mechanism for demultiplexing received BF
packets to the proper session. The procedure for de= multiplexing packets with Your Discriminator equal to 0 is different from[RFC5880].
For such packets, the BFD session MUST be identifi= ed
using the inner headers,=
 i.e., the source IP and the destination IP
present in the IP header carried by the payload of the VXLAN
encapsulated packet.

<= div>>>>
How does this work if the source IP and dest IP = are the same as specified in 5.1?
GIM>> = You're right, Destination and source IP addresses likely are the same i= n this case. Will add that the source UDP port number, along with the pair = of IP addresses, MUST be used to demux received BFD control packets. Would = you agree that will be sufficient?=C2=A0

Editorial

- Terminology section should be renamed to acronyms.
GIM>> Accepted=C2=A0
- Document would ben= efit from a thorough editorial scrub, but maybe that will happen once it ge= ts to the RFC editor.
GIM>> Will certain= ly have helpful comments from ADs and RFC editor.

Section = 1
>>>
"Virtual eXten= sible Local Area Network" (VXLAN) [RFC7348]. provid= es an encapsulation scheme that allows virtual machines (VMs) to communicate in a data center network.
>>>
This is not accurate.=C2=A0 VXLAN allows you to implement an overlay= to decouple the address space of the attached hosts from that of the netwo= rk.
GIM>> Thank you for the suggested te= xt. Will change as follows:
OLD TEXT:
=C2=A0 =C2=A0&quo= t;Virtual eXtensible Local Area Network" (VXLAN) [RFC7348].=C2=A0 prov= ides
=C2=A0 =C2=A0an encapsulation scheme that allows virtual mac= hines (VMs) to
=C2=A0 =C2=A0communicate in a data center network.= =C2=A0
NEW TEXT:
=C2=A0"Virtual eXtensible Lo= cal Area Network" (VXLAN) [RFC7348].=C2=A0 provides
=C2=A0 = =C2=A0an encapsulation scheme that allows building an overlay network by=C2= =A0
=C2=A0 decoupling the address space of the attached virtual h= osts from that of the network.

Section 7
<= br>
VTEP's -> VTEPs
GIM>> Yes, thank you.=C2=A0
--000000000000a7ac7a057a90e83b-- From nobody Tue Nov 13 11:35:48 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0CEC5130DF9 for ; Tue, 13 Nov 2018 11:35:47 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, 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 61CDhlvYk1HC for ; Tue, 13 Nov 2018 11:35:45 -0800 (PST) Received: from slice.pfrc.org (slice.pfrc.org [67.207.130.108]) by ietfa.amsl.com (Postfix) with ESMTP id 6A710130DFD for ; Tue, 13 Nov 2018 11:35:33 -0800 (PST) Received: by slice.pfrc.org (Postfix, from userid 1001) id 137081E459; Tue, 13 Nov 2018 14:34:36 -0500 (EST) Date: Tue, 13 Nov 2018 14:34:35 -0500 From: Jeffrey Haas To: Greg Mirsky Cc: rtg-bfd WG Subject: Re: BFD WG status Message-ID: <20181113193435.GK3458@pfrc.org> References: <20181108085136.GF19684@pfrc.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Nov 2018 19:35:47 -0000 Greg, On Sun, Nov 11, 2018 at 08:37:31AM +0700, Greg Mirsky wrote: > Hi Jeff, > thank you for keeping the wiki up to date (I believe the group is only WG > with up to date wiki). Couple notes on non-WG drafts related to BFD: > > - draft-mirsky-bfd-p2mp-vrrp-use-case is in WGAP at RTGWG (please feel > free to comment to RTGWG) > - draft-ietf-bess-mvpn-fast-failover is to go to WGLC shortly > - draft-ietf-pim-bfd-p2mp-use-case use of p2mp BFD (BFD in Multipoint > Networks) in PIM-SM over shared Ethernet segments. Thanks. I've incorporated these into the wiki. -- Jeff > > Regards, > Greg > > On Thu, Nov 8, 2018 at 3:52 PM Jeffrey Haas wrote: > > > Working Group, > > > > As is our custom, the BFD wiki has been updated with current status of the > > group and known documents. You are encouraged to review it. > > > > https://trac.ietf.org/trac/bfd/wiki > > > > -- Jeff & Reshad > > > > From nobody Tue Nov 13 12:30:54 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4F2E3130DF1; Tue, 13 Nov 2018 12:30:44 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.42 X-Spam-Level: X-Spam-Status: No, score=-0.42 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, HTML_FONT_FACE_BAD=0.981, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Jxgq92S0jGes; Tue, 13 Nov 2018 12:30:41 -0800 (PST) Received: from mail-ua1-f51.google.com (mail-ua1-f51.google.com [209.85.222.51]) (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 C846612D4EA; Tue, 13 Nov 2018 12:30:40 -0800 (PST) Received: by mail-ua1-f51.google.com with SMTP id d21so4841857uap.9; Tue, 13 Nov 2018 12:30:40 -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=q7pbKhd5lwUNJGnNx9FGR4t80aRtOFjGMe+x4PRT56Q=; b=Q7wp9zt+h2CzZkzROyf7HVQaee4Oe+Hqzjzi7WD2GkSAIuOpqLO4cpfVMbZkPowPeM tXk/XCqCp1luqmqGtKV4qwlswn9Lq3M4BYywe87ffCZX8tzfbFDGh6+jE6Y6HO6wLfD+ W7jsMTUC3H4WH9ofCDBds8p64a/jWMl/SUcpLR8EP+4GURRVL1tBgr6DxgAD1k5rBDGc S6eOQDOHIh03Xqv4/hJ52mdWTPsTd9p5oejysEzLNKoosaqINfdwjCAa/WqND0GpHQ+I gvZ8P5+3wYPHOlBZAzWF5+rh7P1XWZNusiiTSsacwZzSMolhfoIr0llmGIKcc7u3vDR6 X0xw== X-Gm-Message-State: AGRZ1gKlldWjRIPRmTd/3iSBufOovWCQ/vh0SCezqKz7lO2OvTJhGX9n 44noZ+1x35AKJbloVU7DlsKdlhsUg7yNWWjXc6DmLA== X-Google-Smtp-Source: AJdET5d53sToS7GtIHJGldz5g4uWT/jXWGnzmFVC0teOJkBLluMlWP/qYix0DhsC8xJqlYCY2HFG6gcWOsz6OJ688Aw= X-Received: by 2002:ab0:225a:: with SMTP id z26mr3252424uan.100.1542141039547; Tue, 13 Nov 2018 12:30:39 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Anoop Ghanwani Date: Tue, 13 Nov 2018 12:30:27 -0800 Message-ID: Subject: Re: WGLC comments on draft-ietf-bfd-vxlan To: Greg Mirsky Cc: rtg-bfd@ietf.org, nvo3@ietf.org Content-Type: multipart/alternative; boundary="000000000000db1b2d057a91b0ca" Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Nov 2018 20:30:45 -0000 --000000000000db1b2d057a91b0ca Content-Type: text/plain; charset="UTF-8" Hi Greg, Please see inline prefixed with [ag]. Thanks, Anoop On Tue, Nov 13, 2018 at 11:34 AM Greg Mirsky wrote: > Hi Anoop, > many thanks for the thorough review and detailed comments. Please find my > answers, this time for real, in-line tagged GIM>>. > > Regards, > Greg > > On Thu, Nov 8, 2018 at 1:58 AM Anoop Ghanwani > wrote: > >> >> Here are my comments. >> >> Thanks, >> Anoop >> >> == >> >> Philosophical >> >> Since VXLAN is not an IETF standard, should we be defining a standard for >> running BFD on it? Should we define BFD over Geneve instead which is the >> official WG selection? Is that going to be a separate document? >> GIM>> IS-IS is not on the Standard track either but that had not >> prevented IETF from developing tens of standard track RFCs using RFC 1142 >> as the normative reference until RFC 7142 re-classified it as historical. A >> similar path was followed with IS-IS-TE by publishing RFC 3784 until it was >> obsoleted by RFC 5305 four years later. I understand that Down Reference, >> i.e., using informational RFC as the normative reference, is not an unusual >> situation. >> > [ag] OK. I'm not an expert on this part so unless someone else that is an expert (chairs, AD?) can comment on it, I'll just let it go. > > >> >> Technical >> >> Section 1: >> >> This part needs to be rewritten: >> >>> >> The individual racks may be part of a different Layer 3 network, or they >> could be in a single Layer 2 network. The VXLAN segments/overlays are >> overlaid on top of Layer 3 network. A VM can communicate with another VM >> only if they are on the same VXLAN segment. >> >>> >> It's hard to parse and, given IRB, >> > GIM>> Would the following text be acceptable: > OLD TEXT: > VXLAN is typically deployed in data centers interconnecting > virtualized hosts, which may be spread across multiple racks. The > individual racks may be part of a different Layer 3 network, or they > could be in a single Layer 2 network. The VXLAN segments/overlays > are overlaid on top of Layer 3 network. > NEW TEXT: > VXLAN is typically deployed in data centers interconnecting virtualized > hosts of a tenant. VXLAN addresses requirements of the Layer 2 and > Layer 3 data center network infrastructure in the presence of VMs in > a multi-tenant environment, discussed in section 3 [RFC7348], by > providing Layer 2 overlay scheme on a Layer 3 network. > [ag] This is a lot better. > > A VM can communicate with another VM only if they are on the same > VXLAN segment. >> >> the last sentence above is wrong. >> > GIM>> Section 4 in RFC 7348 states: > Only VMs within the same VXLAN segment can communicate with each other. > [ag] VMs on different segments can communicate using routing/IRB, so even RFC 7348 is wrong. Perhaps the text should be modified so say -- "In the absence of a router in the overlay, a VM can communicate...". > > Section 3: >> >>> >> Most deployments will have VMs with only L2 capabilities that >> may not support L3. >> >>> >> Are you suggesting most deployments have VMs with no IP >> addresses/configuration? >> > GIM>> Would re-word as follows: > OLD TEXT: > Most deployments will have VMs with only L2 capabilities that > may not support L3. > NEW TEXT: > Deployments may have VMs with only L2 capabilities that do not support L3. > [ag] I still don't understand this. What does it mean for a VM to not support L3? No IP address, no default GW, something else? > >> >>> >> Having a hierarchical OAM model helps localize faults though it requires >> additional consideration. >> >>> >> What are the additional considerations? >> > GIM>> For example, coordination of BFD intervals across the OAM layers. > [ag] Can we mention them in the draft? > >> Would be useful to add a reference to RFC 8293 in case the reader would >> like to know more about service nodes. >> > GIM>> I have to admit that I don't find how RFC 8293 A Framework for > Multicast in Network Virtualization over Layer 3 is related to this > document. Please help with additional reference to the text of the > document. > [ag] The RFC discusses the use of service nodes which is mentioned here. > >> Section 4 >> >>> >> Separate BFD sessions can be established between the VTEPs (IP1 and IP2) >> for monitoring each of the VXLAN tunnels (VNI 100 and 200). >> >>> >> IMO, the document should mention that this could lead to scaling issues >> given that VTEPs can support well in excess of 4K VNIs. Additionally, we >> should mention that with IRB, a given VNI may not even exist on the >> destination VTEP. Finally, what is the benefit of doing this? There may >> be certain corner cases where it's useful (vs a single BFD session between >> the VTEPs for all VNIs) but it would be good to explain what those are. >> > GIM>> Will add text in the Security Considerations section that VTEPs > should have limit on number of BFD sessions. > [ag] I was hoping for two things: - A mention about the scalability issue right where per-VNI BFD is discussed. (Not sure why that is a security issue/consideration.) - What is the benefit of running BFD per VNI between a pair of VTEPs? > >> Sections 5.1 and 6.1 >> >> In 5.1 we have >> >>> >> The inner MAC frame carrying the BFD payload has the >> following format: >> ... Source IP: IP address of the originating VTEP. Destination IP: IP >> address of the terminating VTEP. >> >>> >> >> In 6.1 we have >> >>> >> >> Since multiple BFD sessions may be running between two >> VTEPs, there needs to be a mechanism for demultiplexing received BF >> >> packets to the proper session. The procedure for demultiplexing >> packets with Your Discriminator equal to 0 is different from[RFC5880 ]. >> >> *For such packets, the BFD session MUST be identified* >> >> *using the inner headers, i.e., the source IP and the destination IP >> present in the IP header carried by the payload of the VXLAN* >> >> *encapsulated packet.* >> >> >> >>> >> How does this work if the source IP and dest IP are the same as specified >> in 5.1? >> > GIM>> You're right, Destination and source IP addresses likely are the > same in this case. Will add that the source UDP port number, along with the > pair of IP addresses, MUST be used to demux received BFD control packets. > Would you agree that will be sufficient? > [ag] Yes, I think that should work. > >> Editorial >> > [ag] Agree with all comments on this section. > >> - Terminology section should be renamed to acronyms. >> > GIM>> Accepted > >> - Document would benefit from a thorough editorial scrub, but maybe that >> will happen once it gets to the RFC editor. >> > GIM>> Will certainly have helpful comments from ADs and RFC editor. > >> >> Section 1 >> >>> >> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348 >> ]. provides an encapsulation scheme >> that allows virtual machines (VMs) to communicate in a data center network. >> >>> >> This is not accurate. VXLAN allows you to implement an overlay to >> decouple the address space of the attached hosts from that of the network. >> > GIM>> Thank you for the suggested text. Will change as follows: > OLD TEXT: > "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. provides > an encapsulation scheme that allows virtual machines (VMs) to > communicate in a data center network. > NEW TEXT: > "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. provides > an encapsulation scheme that allows building an overlay network by > decoupling the address space of the attached virtual hosts from that of > the network. > >> >> Section 7 >> >> VTEP's -> VTEPs >> > GIM>> Yes, thank you. > --000000000000db1b2d057a91b0ca Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Greg,

Please see inline prefixed wit= h [ag].

Thanks,
Anoop

On Tue, Nov 13, 2018 at 11:34 AM Greg Mir= sky <gregimirsky@gmail.com&= gt; wrote:
Hi Anoop,
many thanks for the thorough review and detailed= comments. Please find my answers, this time for real, in-line tagged GIM&g= t;>.

Regards,
Greg

On Thu, Nov 8, 2018 at 1:58 AM Anoop Gha= nwani <anoop@= alumni.duke.edu> wrote:

Here are my comments.
Thanks,
Anoop

=3D=3D
<= div>
Philosophical

Since VXLAN is no= t an IETF standard, should we be defining a standard for running BFD on it?= =C2=A0 Should we define BFD over Geneve instead which is the official WG se= lection?=C2=A0 Is that going to be a separate document?
GIM>> IS-IS is not on the Standard track either but that had n= ot prevented IETF from developing tens of standard track RFCs using RFC 114= 2 as the normative reference until RFC 7142 re-classified it as historical.= A similar path was followed with IS-IS-TE by publishing RFC 3784 until it = was obsoleted by RFC 5305 four years later. I understand that Down Referenc= e, i.e., using informational RFC as the normative reference, is not an unus= ual situation.

[ag] OK.=C2=A0 I'm not an expert on this part so unless someone= else that is an expert (chairs, AD?) can comment on it, I'll just let = it go.
=C2=A0
=C2=A0

Technical

Section 1:

T= his part needs to be rewritten:
>>>
The individual racks may be part of a different Layer 3 network, or they could be in a single Layer 2 network. The VXLAN segments/overlays are overlaid on top of Layer 3 network. A VM can communicate with another VM only if they are on the same VXLAN segment.
>>>
It's hard t= o parse and, given IRB,
GIM>> Would the= following text be acceptable:
OLD TEXT:
=C2=A0 = =C2=A0VXLAN is typically deployed in data centers interconnecting
=C2=A0 =C2=A0virtualized hosts, which may be spread across multiple racks.= =C2=A0 The
=C2=A0 =C2=A0individual racks may be part of a differe= nt Layer 3 network, or they
=C2=A0 =C2=A0could be in a single Lay= er 2 network.=C2=A0 The VXLAN segments/overlays
=C2=A0 =C2=A0are = overlaid on top of Layer 3 network.
NEW TEXT:
VXLAN is typically deployed in data centers interconnect= ing virtualized=C2=A0
hosts of a tenant. VX= LAN addresses requirements of the Layer 2 and=C2=A0
Layer 3 data center network infrastructure in the presence of VMs = in=C2=A0
a multi-tenant environment, discus= sed in section 3 [RFC7348], by
=C2=A0provid= ing Layer 2 overlay scheme on a Layer 3 network.

[ag] This is a lot better.
=C2=A0

=C2=A0A= VM can communicate with another VM only if they are on the sameVXLAN segment.
the last sentence above is wrong.=
GIM>> Section 4 in RFC 7348 states:
Only VMs within the same VXLAN segment can communicate with=C2=A0eac= h other.

[ag] VMs on different segme= nts can communicate using routing/IRB, so even RFC 7348 is wrong.=C2=A0 Per= haps the text should be modified so say -- "In the absence of a router= in the overlay, a VM can communicate...".
=C2=A0
<= blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px= #ccc solid;padding-left:1ex">
<= div dir=3D"ltr">

Section 3:
>>>=
=C2=A0Most deployments will have VMs with o= nly L2 capabilities that
may not support L= 3.
>>>
Are you suggesting most deployments ha= ve VMs with no IP addresses/configuration?
GIM= >> Would re-word as follows:
OLD TEXT:
=C2=A0Most= deployments will have VMs with only L2 capabilities that
=C2=A0m= ay not support L3.
NEW TEXT:
Deployments may have VMs w= ith only L2 capabilities that do not support L3.
[ag] I still don't understand this.=C2=A0 What does it mea= n for a VM to not support L3?=C2=A0 No IP address, no default GW, something= else?
=C2=A0

>= ;>>
Having a hierarchical OAM model he= lps localize faults though it requires additional consideration.
&g= t;>>
What are the additional considerations?
GIM>> For example, coordinat= ion of BFD intervals across the OAM layers.=C2=A0=C2=A0
<= /div>

[ag] Can we mention them in the draft?
=C2= =A0
<= div dir=3D"ltr">

Would be useful to add a reference= to RFC 8293 in case the reader would like to know more about service nodes= .
GIM>> I have = to admit that I don't find how RFC 8293=C2=A0=C2=A0A Framework for Mult= icast in Network Virtualization over Layer 3 is related to this document. P= lease help with additional reference to the text of the document.=C2=A0=C2=A0
=

[ag] The RFC discusses the use= of service nodes which is mentioned here.=C2=A0=C2=A0
=C2=A0

Section 4
>>>
Separate BFD sessions can be established between the VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200).
>>>
IMO, the document should mention that this could l= ead to scaling issues given that VTEPs can support well in excess of 4K VNI= s.=C2=A0 Additionally, we should mention that with IRB, a given VNI may not= even exist on the destination VTEP.=C2=A0 Finally, what is the benefit of = doing this?=C2=A0 There may be certain corner cases where it's useful (= vs a single BFD session between the VTEPs for all VNIs) but it would be goo= d to explain what those are.
GIM>> Will add text in the Security Considerations section th= at VTEPs should have limit on number of BFD sessions.=C2=A0

[ag] I was hoping for two things:
- A = mention about the scalability issue right where per-VNI BFD is discussed.= =C2=A0 (Not sure why that is a security issue/consideration.)
- W= hat is the benefit of running BFD per VNI between a pair of VTEPs?
=C2=A0

Sections 5.1 and 6.1
<= div>
In 5.1 we have
>>>
The inner MAC frame carrying the BFD payload has the
following format:
... Source IP: IP address of the originating VTEP. Destination IP: IP address of the terminating VTEP.
Since multiple BFD sessions may be running between two VTEPs, there needs to be a mechanism for demultiplexing received BFpackets to the proper session. = The procedure for demultiplexing packets with Your Discriminator equal to 0 is different from[RFC5880].
For such packets, the BFD ses= sion MUST be identified
using the inner headers, i.e., the source IP and the dest=
ination IP
present in the IP header carried by the payload of the VXLAN
encapsulated packet.=

>>>
How does this work if the s= ource IP and dest IP are the same as specified in 5.1?
GIM>> You're right, Destination and source IP addresses = likely are the same in this case. Will add that the source UDP port number,= along with the pair of IP addresses, MUST be used to demux received BFD co= ntrol packets. Would you agree that will be sufficient?=C2=A0

[ag] Yes, I think that should work.=C2=A0

Editorial
=
[ag] Agree with all comments on this section.=C2=A0

- Terminology section should be renamed to acr= onyms.
GIM>> Accepted=C2=A0
- Document= would benefit from a thorough editorial scrub, but maybe that will happen = once it gets to the RFC editor.
GIM>> Wi= ll certainly have helpful comments from ADs and RFC editor.

Section 1
>>>
"Vir= tual eXtensible Local Area Network" (VXLAN) [RFC7348= ]. provides an encapsulation scheme that allows virtual machines (VMs) to communicate in a data center network.
>>>
This is not accurate.=C2=A0 VXLAN allows you to implement an overlay= to decouple the address space of the attached hosts from that of the netwo= rk.
GIM>> Thank you for the suggested te= xt. Will change as follows:
OLD TEXT:
=C2=A0 =C2=A0&quo= t;Virtual eXtensible Local Area Network" (VXLAN) [RFC7348].=C2=A0 prov= ides
=C2=A0 =C2=A0an encapsulation scheme that allows virtual mac= hines (VMs) to
=C2=A0 =C2=A0communicate in a data center network.= =C2=A0
NEW TEXT:
=C2=A0"Virtual eXtensible Lo= cal Area Network" (VXLAN) [RFC7348].=C2=A0 provides
=C2=A0 = =C2=A0an encapsulation scheme that allows building an overlay network by=C2= =A0
=C2=A0 decoupling the address space of the attached virtual h= osts from that of the network.

Section 7
<= br>
VTEP's -> VTEPs
GIM>> Yes, thank you.=C2=A0
--000000000000db1b2d057a91b0ca-- From nobody Wed Nov 14 09:54:47 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2055F12958B; Wed, 14 Nov 2018 09:45:39 -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 YhCPQmVSSauv; Wed, 14 Nov 2018 09:45:33 -0800 (PST) Received: from mail-lj1-x233.google.com (mail-lj1-x233.google.com [IPv6:2a00:1450:4864:20::233]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E1B7D127332; Wed, 14 Nov 2018 09:45:32 -0800 (PST) Received: by mail-lj1-x233.google.com with SMTP id l15-v6so6667961lja.9; Wed, 14 Nov 2018 09:45:32 -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=97dYJXWBOJ3BVUiusq0Zfy8H6taK6Bj+YoWfyYi28nM=; b=jnFbKdsK85rBxxMHUtwVcTj/mmpcc8R+3H4uHOivrmpF6Mb+kxY1KczPC4D6C/Fuas itjRz2Cd106wZ9DNL6BFRMauENkExy3Z3yS1A8Dg8qTNW8b6dcdARF+QVijgxtTwo2gD Y9jscSH2eKW5/T68RpzA0V3UyO596/tNGsWmoUYDtzshb1Sbo4iFkV+HwnavCRutCKyW eTv4tp8Vdh/tN1h+XfqeMCYbC16iku1DyyS5/o2l+LzlFfLh2ZcfkyEbY7Vim7H7d/SR CEUUJlzMbOP/3s8pEt7PQCJT3lcn67FD/JIkMEj3QciKsjsxtPJRyRrd9yI9d1fP+BB7 Xp7A== 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=97dYJXWBOJ3BVUiusq0Zfy8H6taK6Bj+YoWfyYi28nM=; b=LKJG6BHMad5VVA8He7pETa79dgHcjyQ7qY+G/Z7kqPZgyupBX+XkGHbOwYAW0JifHf Pu6BZxzMVAdoNXdIX//+hjt4iGSVpq068fvH0xKEqPszZJhe8BKH7zWj6alUZvsFDQHr ZTUmXC5Yj3/qaVE5uHsxI8c6+UaltqSLP5chkXl8q5kJqmircDBuVh1kDA8dlN7TZjYQ kiQ/mbP3clkLKiCke+Hp/slzkNrqmV1Fgq8v4sVn6zwCHR3i41qhgl+VYmfK6yMhCyFK 0fw1wj+JoG5+JeMpNufmHjdPxaBs+wzW2r4YzERkeeEkM5EyvDmPWIzu0bRJiLIwccFN hrxw== X-Gm-Message-State: AGRZ1gLH+h5UeMVklcGm8fyGZtHLU16OlWCcFzXhE2UYn4NJsApr6g2q MG69ryR9mEo4bfIvhUFjogc8H8XKYFJS/BsADmx0XE1h X-Google-Smtp-Source: AJdET5enWUJuaHsdWmGvCTHV72gTfSlSmPsvFubo9hwMfJty3UYDO8/b/XO1PJaAAyh1FF9+SvpO4e7ZhCdErQoBX2s= X-Received: by 2002:a2e:5109:: with SMTP id f9-v6mr1841256ljb.52.1542217530893; Wed, 14 Nov 2018 09:45:30 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Greg Mirsky Date: Wed, 14 Nov 2018 09:45:19 -0800 Message-ID: Subject: Re: WGLC comments on draft-ietf-bfd-vxlan To: Anoop Ghanwani Cc: rtg-bfd WG , NVO3 Content-Type: multipart/mixed; boundary="00000000000018b83b057aa38053" Archived-At: X-Mailman-Approved-At: Wed, 14 Nov 2018 09:54:45 -0800 X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Nov 2018 17:45:39 -0000 --00000000000018b83b057aa38053 Content-Type: multipart/alternative; boundary="00000000000018b837057aa38051" --00000000000018b837057aa38051 Content-Type: text/plain; charset="UTF-8" Hi Anoop, thank you for the expedient response. I am glad that some of my responses have addressed your concerns. Please find followup notes in-line tagged GIM2>>. I've attached the diff to highlight the updates applied in the working version. Let me know if these are acceptable changes. Regards, Greg On Tue, Nov 13, 2018 at 12:30 PM Anoop Ghanwani wrote: > Hi Greg, > > Please see inline prefixed with [ag]. > > Thanks, > Anoop > > On Tue, Nov 13, 2018 at 11:34 AM Greg Mirsky > wrote: > >> Hi Anoop, >> many thanks for the thorough review and detailed comments. Please find my >> answers, this time for real, in-line tagged GIM>>. >> >> Regards, >> Greg >> >> On Thu, Nov 8, 2018 at 1:58 AM Anoop Ghanwani >> wrote: >> >>> >>> Here are my comments. >>> >>> Thanks, >>> Anoop >>> >>> == >>> >>> Philosophical >>> >>> Since VXLAN is not an IETF standard, should we be defining a standard >>> for running BFD on it? Should we define BFD over Geneve instead which is >>> the official WG selection? Is that going to be a separate document? >>> GIM>> IS-IS is not on the Standard track either but that had not >>> prevented IETF from developing tens of standard track RFCs using RFC 1142 >>> as the normative reference until RFC 7142 re-classified it as historical. A >>> similar path was followed with IS-IS-TE by publishing RFC 3784 until it was >>> obsoleted by RFC 5305 four years later. I understand that Down Reference, >>> i.e., using informational RFC as the normative reference, is not an unusual >>> situation. >>> >> > [ag] OK. I'm not an expert on this part so unless someone else that is an > expert (chairs, AD?) can comment on it, I'll just let it go. > > >> >> >>> >>> Technical >>> >>> Section 1: >>> >>> This part needs to be rewritten: >>> >>> >>> The individual racks may be part of a different Layer 3 network, or they >>> could be in a single Layer 2 network. The VXLAN segments/overlays are >>> overlaid on top of Layer 3 network. A VM can communicate with another VM >>> only if they are on the same VXLAN segment. >>> >>> >>> It's hard to parse and, given IRB, >>> >> GIM>> Would the following text be acceptable: >> OLD TEXT: >> VXLAN is typically deployed in data centers interconnecting >> virtualized hosts, which may be spread across multiple racks. The >> individual racks may be part of a different Layer 3 network, or they >> could be in a single Layer 2 network. The VXLAN segments/overlays >> are overlaid on top of Layer 3 network. >> NEW TEXT: >> VXLAN is typically deployed in data centers interconnecting virtualized >> hosts of a tenant. VXLAN addresses requirements of the Layer 2 and >> Layer 3 data center network infrastructure in the presence of VMs in >> a multi-tenant environment, discussed in section 3 [RFC7348], by >> providing Layer 2 overlay scheme on a Layer 3 network. >> > > [ag] This is a lot better. > > >> >> A VM can communicate with another VM only if they are on the same >> VXLAN segment. >>> >>> the last sentence above is wrong. >>> >> GIM>> Section 4 in RFC 7348 states: >> Only VMs within the same VXLAN segment can communicate with each other. >> > > [ag] VMs on different segments can communicate using routing/IRB, so even > RFC 7348 is wrong. Perhaps the text should be modified so say -- "In the > absence of a router in the overlay, a VM can communicate...". > > >> >> Section 3: >>> >>> >>> Most deployments will have VMs with only L2 capabilities that >>> may not support L3. >>> >>> >>> Are you suggesting most deployments have VMs with no IP >>> addresses/configuration? >>> >> GIM>> Would re-word as follows: >> OLD TEXT: >> Most deployments will have VMs with only L2 capabilities that >> may not support L3. >> NEW TEXT: >> Deployments may have VMs with only L2 capabilities that do not support L3. >> > > [ag] I still don't understand this. What does it mean for a VM to not > support L3? No IP address, no default GW, something else? > GIM2>> VM communicates with its VTEP which, in turn, originates VXLAN tunnel. VM is not required to have IP address as it is VTEP's IP address that VM's MAC is associated with. As for gateway, RFC 7348 discusses VXLAN gateway as the device that forwards traffice between VXLAN and non-VXLAN domains. Considering all that, would the following change be acceptable: OLD TEXT: Most deployments will have VMs with only L2 capabilities that may not support L3. NEW TEXT: Most deployments will have VMs with only L2 capabilities and not have an IP address assigned. > > >> >>> >>> >>> Having a hierarchical OAM model helps localize faults though it requires >>> additional consideration. >>> >>> >>> What are the additional considerations? >>> >> GIM>> For example, coordination of BFD intervals across the OAM layers. >> > > [ag] Can we mention them in the draft? > > >> >>> Would be useful to add a reference to RFC 8293 in case the reader would >>> like to know more about service nodes. >>> >> GIM>> I have to admit that I don't find how RFC 8293 A Framework for >> Multicast in Network Virtualization over Layer 3 is related to this >> document. Please help with additional reference to the text of the >> document. >> > > [ag] The RFC discusses the use of service nodes which is mentioned here. > > >> >>> Section 4 >>> >>> >>> Separate BFD sessions can be established between the VTEPs (IP1 and IP2) >>> for monitoring each of the VXLAN tunnels (VNI 100 and 200). >>> >>> >>> IMO, the document should mention that this could lead to scaling issues >>> given that VTEPs can support well in excess of 4K VNIs. Additionally, we >>> should mention that with IRB, a given VNI may not even exist on the >>> destination VTEP. Finally, what is the benefit of doing this? There may >>> be certain corner cases where it's useful (vs a single BFD session between >>> the VTEPs for all VNIs) but it would be good to explain what those are. >>> >> GIM>> Will add text in the Security Considerations section that VTEPs >> should have limit on number of BFD sessions. >> > > [ag] I was hoping for two things: > - A mention about the scalability issue right where per-VNI BFD is > discussed. (Not sure why that is a security issue/consideration.) > GIM2>> I've added the following sentense in both places: The implementation SHOULD have a reasonable upper bound on the number of BFD sessions that can be created between the same pair of VTEPs. > - What is the benefit of running BFD per VNI between a pair of VTEPs? > GIM2>> An alternative would be to run CFM between VMs, if there's the need to monitor liveliness of the particular VM. Again, this is optional. > > >> >>> Sections 5.1 and 6.1 >>> >>> In 5.1 we have >>> >>> >>> The inner MAC frame carrying the BFD payload has the >>> following format: >>> ... Source IP: IP address of the originating VTEP. Destination IP: IP >>> address of the terminating VTEP. >>> >>> >>> >>> In 6.1 we have >>> >>> >>> >>> Since multiple BFD sessions may be running between two >>> VTEPs, there needs to be a mechanism for demultiplexing received BF >>> >>> packets to the proper session. The procedure for demultiplexing >>> packets with Your Discriminator equal to 0 is different from[RFC5880 ]. >>> >>> *For such packets, the BFD session MUST be identified* >>> >>> *using the inner headers, i.e., the source IP and the destination IP >>> present in the IP header carried by the payload of the VXLAN* >>> >>> *encapsulated packet.* >>> >>> >>> >>> >>> How does this work if the source IP and dest IP are the same as >>> specified in 5.1? >>> >> GIM>> You're right, Destination and source IP addresses likely are the >> same in this case. Will add that the source UDP port number, along with the >> pair of IP addresses, MUST be used to demux received BFD control packets. >> Would you agree that will be sufficient? >> > > [ag] Yes, I think that should work. > >> >>> Editorial >>> >> > [ag] Agree with all comments on this section. > >> >>> - Terminology section should be renamed to acronyms. >>> >> GIM>> Accepted >> >>> - Document would benefit from a thorough editorial scrub, but maybe that >>> will happen once it gets to the RFC editor. >>> >> GIM>> Will certainly have helpful comments from ADs and RFC editor. >> >>> >>> Section 1 >>> >>> >>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348 >>> ]. provides an encapsulation >>> scheme that allows virtual machines (VMs) to communicate in a data center >>> network. >>> >>> >>> This is not accurate. VXLAN allows you to implement an overlay to >>> decouple the address space of the attached hosts from that of the network. >>> >> GIM>> Thank you for the suggested text. Will change as follows: >> OLD TEXT: >> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. provides >> an encapsulation scheme that allows virtual machines (VMs) to >> communicate in a data center network. >> NEW TEXT: >> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. provides >> an encapsulation scheme that allows building an overlay network by >> decoupling the address space of the attached virtual hosts from that of >> the network. >> >>> >>> Section 7 >>> >>> VTEP's -> VTEPs >>> >> GIM>> Yes, thank you. >> > --00000000000018b837057aa38051 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Anoop,
thank you for the expedient= =C2=A0response. I am glad that some=C2=A0of my responses have addressed you= r concerns. Please find followup notes in-line tagged GIM2>>. I'v= e attached the diff to highlight the updates applied in the working version= . Let me know if these are acceptable changes.

Reg= ards,
Greg

O= n Tue, Nov 13, 2018 at 12:30 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
=
Hi= Greg,

Please see inline prefixed with [ag].
<= br>
Thanks,
Anoop

On Tue, Nov 13, 2018 at 11:34 AM Greg Mirsky <gregimirsky@gmail.com>= ; wrote:
Hi Anoop,
many thanks for the thorough re= view and detailed comments. Please find my answers, this time for real, in-= line tagged GIM>>.

Regards,
Greg
On Thu, Nov 8, 2018 at = 1:58 AM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:

Here are my comm= ents.

Thanks,
Anoop

=
=3D=3D

Philosophical

Since VXLAN is not an IETF standard, should we be defining a standard for = running BFD on it?=C2=A0 Should we define BFD over Geneve instead which is = the official WG selection?=C2=A0 Is that going to be a separate document?
GIM>> IS-IS is not on the Standard track eit= her but that had not prevented IETF from developing tens of standard track = RFCs using RFC 1142 as the normative reference until RFC 7142 re-classified= it as historical. A similar path was followed with IS-IS-TE by publishing = RFC 3784 until it was obsoleted by RFC 5305 four years later. I understand = that Down Reference, i.e., using informational RFC as the normative referen= ce, is not an unusual situation.

[ag] OK.=C2=A0 I'm not an expert on this part= so unless someone else that is an expert (chairs, AD?) can comment on it, = I'll just let it go.
=C2=A0
=C2=A0

Technical

Section 1:

This part needs to be rewritten:
=
>>>
The individual racks may be part of a different Layer 3 network, or they could be in a single Layer 2 network. The VXLAN segments/overlays are overlaid on top of Layer 3 network. A VM can communicate with another VM only if they are on the same VXLAN segment.
>>>
It's hard t= o parse and, given IRB,
GIM>> Would the= following text be acceptable:
OLD TEXT:
=C2=A0 = =C2=A0VXLAN is typically deployed in data centers interconnecting
=C2=A0 =C2=A0virtualized hosts, which may be spread across multiple racks.= =C2=A0 The
=C2=A0 =C2=A0individual racks may be part of a differe= nt Layer 3 network, or they
=C2=A0 =C2=A0could be in a single Lay= er 2 network.=C2=A0 The VXLAN segments/overlays
=C2=A0 =C2=A0are = overlaid on top of Layer 3 network.
NEW TEXT:
VXLAN is typically deployed in data centers interconnect= ing virtualized=C2=A0
hosts of a tenant. VX= LAN addresses requirements of the Layer 2 and=C2=A0
Layer 3 data center network infrastructure in the presence of VMs = in=C2=A0
a multi-tenant environment, discus= sed in section 3 [RFC7348], by
=C2=A0provid= ing Layer 2 overlay scheme on a Layer 3 network.

[ag] This is a lot better.
=C2=A0

=C2=A0A VM can communicate with another VM only if they are on th= e same
VXLAN segment.
the last sentenc= e above is wrong.
GIM>> Section 4 in RFC= 7348 states:
Only VMs within the same VXLAN segment can communic= ate with=C2=A0each other.

[ag] VMs o= n different segments can communicate using routing/IRB, so even RFC 7348 is= wrong.=C2=A0 Perhaps the text should be modified so say -- "In the ab= sence of a router in the overlay, a VM can communicate...".
= =C2=A0
<= div>Section 3:
>>>
=C2=A0= Most deployments will have VMs with only L2 capabilities that
<= span style=3D"color:rgb(0,0,0);font-family:monospace;font-size:13.3333px;wh= ite-space:pre-wrap">may not support L3.
>>>
A= re you suggesting most deployments have VMs with no IP addresses/configurat= ion?
GIM>> Would re-word as follows:
OLD TEXT:
=C2=A0Most deployments will have VMs with only L= 2 capabilities that
=C2=A0may not support L3.
NEW TEXT:=
Deployments may have VMs with only L2 capabilities that do not s= upport L3.
<= /div>

[ag] I still don't un= derstand this.=C2=A0 What does it mean for a VM to not support L3?=C2=A0 No= IP address, no default GW, something else?
GIM2>> VM communicates with its VTEP which, in turn, origin= ates VXLAN tunnel. VM is not required to have IP address as it is VTEP'= s IP address that VM's MAC is associated with. As for gateway, RFC 7348= discusses VXLAN gateway as the device that forwards traffice between VXLAN= and non-VXLAN domains. Considering all that, would the following change be= acceptable:
OLD TEXT:
=C2=A0Most deployments will= have VMs with only L2 capabilities that
=C2=A0may not support L3= .
NEW TEXT:
=C2=A0Most deployments will have= VMs with only L2 capabilities and not have an IP address assigned.
=C2=A0

>>>
Having a hierarchical OAM model helps localize faults though it requires additional consideration.
&g= t;>>
What are the additional considerations?
GIM>> For example, coordinat= ion of BFD intervals across the OAM layers.=C2=A0=C2=A0
<= /div>

[ag] Can we mention them in the draft?
=C2= =A0

Would be useful= to add a reference to RFC 8293 in case the reader would like to know more = about service nodes.
= GIM>> I have to admit that I don't find how RFC 8293=C2=A0=C2=A0A= Framework for Multicast in Network Virtualization over Layer 3 is related = to this document. Please help with additional reference to the text of the = document.=C2=A0=C2=A0

[ag] The RF= C discusses the use of service nodes which is mentioned here.=C2=A0=C2=A0
=C2=A0
<= div dir=3D"ltr">

Sec= tion 4
>>>
Separate BFD sessions can be established between the VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200).
>>>
IMO, the document should mention that this could l= ead to scaling issues given that VTEPs can support well in excess of 4K VNI= s.=C2=A0 Additionally, we should mention that with IRB, a given VNI may not= even exist on the destination VTEP.=C2=A0 Finally, what is the benefit of = doing this?=C2=A0 There may be certain corner cases where it's useful (= vs a single BFD session between the VTEPs for all VNIs) but it would be goo= d to explain what those are.
GIM>> Will add text in the Security Considerations section th= at VTEPs should have limit on number of BFD sessions.=C2=A0

[ag] I was hoping for two things:
- A = mention about the scalability issue right where per-VNI BFD is discussed.= =C2=A0 (Not sure why that is a security issue/consideration.)
GIM2>> I've added the following sente= nse in both places:
The implementation SHOULD have a reasonable u= pper bound on the number of BFD sessions that can be created between the sa= me pair of VTEPs.=C2=A0
- What is the ben= efit of running BFD per VNI between a pair of VTEPs?
GIM2>> An alternative would be to run CFM between = VMs, if there's the need to monitor liveliness of the particular VM. Ag= ain, this is optional.=C2=A0
=C2=A0

Sections 5.1 and 6.1

In 5.1 we have
>>>
The inner MAC frame carrying the BFD payload has the
following format:
... Source IP: IP address of the originating VTEP. Destination IP: IP address of the terminating VTEP.
>>><= /div>

In 6.1 we have=C2=A0
>>>
<= div>
Since multiple BFD sessions may be running between =
two
VTEPs, there needs to be a mechanism for demultiplexing received BF
packets to the proper session. The procedure for demulti= plexing packets with Your Discriminator equal to 0 is different from[RFC5880].
For such packets, the BFD session MUST be identified
using the inner headers, i.e., th=
e source IP and the destination IP
present in the IP header carried by the payload of the VXLAN
encapsulated packet.

&= gt;>>
How does this work if the source IP and dest IP are t= he same as specified in 5.1?
GIM>> You&#= 39;re right, Destination and source IP addresses likely are the same in thi= s case. Will add that the source UDP port number, along with the pair of IP= addresses, MUST be used to demux received BFD control packets. Would you a= gree that will be sufficient?=C2=A0

[ag]= Yes, I think that should work.=C2=A0
<= div>
Editorial

[ag] Agree with all comments on this section.=C2=A0
<= div dir=3D"ltr">

- Terminology section should be re= named to acronyms.
GIM>> Accepted=C2=A0<= /div>
- Document would benefit from a thorough editorial scrub, but maybe that = will happen once it gets to the RFC editor.
GI= M>> Will certainly have helpful comments from ADs and RFC editor.
<= br>
Section 1
>>>
"Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. provides an encapsulation scheme that allows virtual machines (VMs) to communicate in a data center network.
>>>
This is not accurate.=C2=A0 VXLAN allows you to implement an overlay= to decouple the address space of the attached hosts from that of the netwo= rk.
GIM>> Thank you for the suggested te= xt. Will change as follows:
OLD TEXT:
=C2=A0 =C2=A0&quo= t;Virtual eXtensible Local Area Network" (VXLAN) [RFC7348].=C2=A0 prov= ides
=C2=A0 =C2=A0an encapsulation scheme that allows virtual mac= hines (VMs) to
=C2=A0 =C2=A0communicate in a data center network.= =C2=A0
NEW TEXT:
=C2=A0"Virtual eXtensible Lo= cal Area Network" (VXLAN) [RFC7348].=C2=A0 provides
=C2=A0 = =C2=A0an encapsulation scheme that allows building an overlay network by=C2= =A0
=C2=A0 decoupling the address space of the attached virtual h= osts from that of the network.

Section 7
<= br>
VTEP's -> VTEPs
GIM>> Yes, thank you.=C2=A0
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14 Nov 2018 23:00:51 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Anoop Ghanwani Date: Wed, 14 Nov 2018 23:00:37 -0800 Message-ID: Subject: Re: WGLC comments on draft-ietf-bfd-vxlan To: Greg Mirsky Cc: rtg-bfd@ietf.org, nvo3@ietf.org Content-Type: multipart/alternative; boundary="00000000000075e4cf057aae9cd0" Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Nov 2018 07:00:58 -0000 --00000000000075e4cf057aae9cd0 Content-Type: text/plain; charset="UTF-8" Hi Greg, Please see inline prefixed with [ag2]. Thanks, Anoop On Wed, Nov 14, 2018 at 9:45 AM Greg Mirsky wrote: > Hi Anoop, > thank you for the expedient response. I am glad that some of my responses > have addressed your concerns. Please find followup notes in-line tagged > GIM2>>. I've attached the diff to highlight the updates applied in the > working version. Let me know if these are acceptable changes. > > Regards, > Greg > > On Tue, Nov 13, 2018 at 12:30 PM Anoop Ghanwani > wrote: > >> Hi Greg, >> >> Please see inline prefixed with [ag]. >> >> Thanks, >> Anoop >> >> On Tue, Nov 13, 2018 at 11:34 AM Greg Mirsky >> wrote: >> >>> Hi Anoop, >>> many thanks for the thorough review and detailed comments. Please find >>> my answers, this time for real, in-line tagged GIM>>. >>> >>> Regards, >>> Greg >>> >>> On Thu, Nov 8, 2018 at 1:58 AM Anoop Ghanwani >>> wrote: >>> >>>> >>>> Here are my comments. >>>> >>>> Thanks, >>>> Anoop >>>> >>>> == >>>> >>>> Philosophical >>>> >>>> Since VXLAN is not an IETF standard, should we be defining a standard >>>> for running BFD on it? Should we define BFD over Geneve instead which is >>>> the official WG selection? Is that going to be a separate document? >>>> GIM>> IS-IS is not on the Standard track either but that had not >>>> prevented IETF from developing tens of standard track RFCs using RFC 1142 >>>> as the normative reference until RFC 7142 re-classified it as historical. A >>>> similar path was followed with IS-IS-TE by publishing RFC 3784 until it was >>>> obsoleted by RFC 5305 four years later. I understand that Down Reference, >>>> i.e., using informational RFC as the normative reference, is not an unusual >>>> situation. >>>> >>> >> [ag] OK. I'm not an expert on this part so unless someone else that is >> an expert (chairs, AD?) can comment on it, I'll just let it go. >> >> >>> >>> >>>> >>>> Technical >>>> >>>> Section 1: >>>> >>>> This part needs to be rewritten: >>>> >>> >>>> The individual racks may be part of a different Layer 3 network, or >>>> they could be in a single Layer 2 network. The VXLAN segments/overlays are >>>> overlaid on top of Layer 3 network. A VM can communicate with another VM >>>> only if they are on the same VXLAN segment. >>>> >>> >>>> It's hard to parse and, given IRB, >>>> >>> GIM>> Would the following text be acceptable: >>> OLD TEXT: >>> VXLAN is typically deployed in data centers interconnecting >>> virtualized hosts, which may be spread across multiple racks. The >>> individual racks may be part of a different Layer 3 network, or they >>> could be in a single Layer 2 network. The VXLAN segments/overlays >>> are overlaid on top of Layer 3 network. >>> NEW TEXT: >>> VXLAN is typically deployed in data centers interconnecting virtualized >>> hosts of a tenant. VXLAN addresses requirements of the Layer 2 and >>> Layer 3 data center network infrastructure in the presence of VMs in >>> a multi-tenant environment, discussed in section 3 [RFC7348], by >>> providing Layer 2 overlay scheme on a Layer 3 network. >>> >> >> [ag] This is a lot better. >> >> >>> >>> A VM can communicate with another VM only if they are on the same >>> VXLAN segment. >>>> >>>> the last sentence above is wrong. >>>> >>> GIM>> Section 4 in RFC 7348 states: >>> Only VMs within the same VXLAN segment can communicate with each other. >>> >> >> [ag] VMs on different segments can communicate using routing/IRB, so even >> RFC 7348 is wrong. Perhaps the text should be modified so say -- "In the >> absence of a router in the overlay, a VM can communicate...". >> >> >>> >>> Section 3: >>>> >>> >>>> Most deployments will have VMs with only L2 capabilities that >>>> may not support L3. >>>> >>> >>>> Are you suggesting most deployments have VMs with no IP >>>> addresses/configuration? >>>> >>> GIM>> Would re-word as follows: >>> OLD TEXT: >>> Most deployments will have VMs with only L2 capabilities that >>> may not support L3. >>> NEW TEXT: >>> Deployments may have VMs with only L2 capabilities that do not support >>> L3. >>> >> >> [ag] I still don't understand this. What does it mean for a VM to not >> support L3? No IP address, no default GW, something else? >> > GIM2>> VM communicates with its VTEP which, in turn, originates VXLAN > tunnel. VM is not required to have IP address as it is VTEP's IP address > that VM's MAC is associated with. As for gateway, RFC 7348 discusses VXLAN > gateway as the device that forwards traffice between VXLAN and non-VXLAN > domains. Considering all that, would the following change be acceptable: > OLD TEXT: > Most deployments will have VMs with only L2 capabilities that > may not support L3. > NEW TEXT: > Most deployments will have VMs with only L2 capabilities and not have an > IP address assigned. > [ag2] Do you have a reference for this (i.e. that most deployments have VMs without an IP address)? Normally I would think VMs would have an IP address. It's just that they are segregated into segments and, without an intervening router, they are restricted to communicate only within their subnet. > >> >>> >>>> >>> >>>> Having a hierarchical OAM model helps localize faults though it >>>> requires additional consideration. >>>> >>> >>>> What are the additional considerations? >>>> >>> GIM>> For example, coordination of BFD intervals across the OAM layers. >>> >>> >> >> [ag] Can we mention them in the draft? >> >> >>> >>>> Would be useful to add a reference to RFC 8293 in case the reader would >>>> like to know more about service nodes. >>>> >>> GIM>> I have to admit that I don't find how RFC 8293 A Framework for >>> Multicast in Network Virtualization over Layer 3 is related to this >>> document. Please help with additional reference to the text of the >>> document. >>> >> >> [ag] The RFC discusses the use of service nodes which is mentioned here. >> >> >>> >>>> Section 4 >>>> >>> >>>> Separate BFD sessions can be established between the VTEPs (IP1 and >>>> IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200). >>>> >>> >>>> IMO, the document should mention that this could lead to scaling issues >>>> given that VTEPs can support well in excess of 4K VNIs. Additionally, we >>>> should mention that with IRB, a given VNI may not even exist on the >>>> destination VTEP. Finally, what is the benefit of doing this? There may >>>> be certain corner cases where it's useful (vs a single BFD session between >>>> the VTEPs for all VNIs) but it would be good to explain what those are. >>>> >>> GIM>> Will add text in the Security Considerations section that VTEPs >>> should have limit on number of BFD sessions. >>> >> >> [ag] I was hoping for two things: >> - A mention about the scalability issue right where per-VNI BFD is >> discussed. (Not sure why that is a security issue/consideration.) >> > GIM2>> I've added the following sentense in both places: > The implementation SHOULD have a reasonable upper bound on the number of > BFD sessions that can be created between the same pair of VTEPs. > [ag2] What is the criteria for determining what is reasonable? > - What is the benefit of running BFD per VNI between a pair of VTEPs? >> > GIM2>> An alternative would be to run CFM between VMs, if there's the need > to monitor liveliness of the particular VM. Again, this is optional. > [ag2] I'm not sure how running per-VNI BFD between the VTEPs allows one to monitor the liveliness of VMs. > >> >>> >>>> Sections 5.1 and 6.1 >>>> >>>> In 5.1 we have >>>> >>> >>>> The inner MAC frame carrying the BFD payload has the >>>> following format: >>>> ... Source IP: IP address of the originating VTEP. Destination IP: IP >>>> address of the terminating VTEP. >>>> >>> >>>> >>>> In 6.1 we have >>>> >>> >>>> >>>> Since multiple BFD sessions may be running between two >>>> VTEPs, there needs to be a mechanism for demultiplexing received BF >>>> >>>> packets to the proper session. The procedure for demultiplexing >>>> packets with Your Discriminator equal to 0 is different from[RFC5880 ]. >>>> >>>> *For such packets, the BFD session MUST be identified* >>>> >>>> *using the inner headers, i.e., the source IP and the destination IP >>>> present in the IP header carried by the payload of the VXLAN* >>>> >>>> *encapsulated packet.* >>>> >>>> >>>> >>> >>>> How does this work if the source IP and dest IP are the same as >>>> specified in 5.1? >>>> >>> GIM>> You're right, Destination and source IP addresses likely are the >>> same in this case. Will add that the source UDP port number, along with the >>> pair of IP addresses, MUST be used to demux received BFD control packets. >>> Would you agree that will be sufficient? >>> >> >> [ag] Yes, I think that should work. >> >>> >>>> Editorial >>>> >>> >> [ag] Agree with all comments on this section. >> >>> >>>> - Terminology section should be renamed to acronyms. >>>> >>> GIM>> Accepted >>> >>>> - Document would benefit from a thorough editorial scrub, but maybe >>>> that will happen once it gets to the RFC editor. >>>> >>> GIM>> Will certainly have helpful comments from ADs and RFC editor. >>> >>>> >>>> Section 1 >>>> >>> >>>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348 >>>> ]. provides an encapsulation >>>> scheme that allows virtual machines (VMs) to communicate in a data center >>>> network. >>>> >>> >>>> This is not accurate. VXLAN allows you to implement an overlay to >>>> decouple the address space of the attached hosts from that of the network. >>>> >>> GIM>> Thank you for the suggested text. Will change as follows: >>> OLD TEXT: >>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. provides >>> an encapsulation scheme that allows virtual machines (VMs) to >>> communicate in a data center network. >>> NEW TEXT: >>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. provides >>> an encapsulation scheme that allows building an overlay network by >>> decoupling the address space of the attached virtual hosts from that >>> of the network. >>> >>>> >>>> Section 7 >>>> >>>> VTEP's -> VTEPs >>>> >>> GIM>> Yes, thank you. >>> >> --00000000000075e4cf057aae9cd0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Greg,

Please see inline prefixed wit= h [ag2].

Thanks,
Anoop

On Wed, Nov 14, 2018 at = 9:45 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop,
thank you for the= expedient=C2=A0response. I am glad that some=C2=A0of my responses have add= ressed your concerns. Please find followup notes in-line tagged GIM2>>= ;. I've attached the diff to highlight the updates applied in the worki= ng version. Let me know if these are acceptable changes.

Regards,
Greg

On Tue, Nov 13, 2018 at 12:30 PM Anoop Ghanwani <anoop@alumni.duke.edu> = wrote:
Hi Greg,

Please see inline prefixed with [ag].<= /div>

Thanks,
Anoop

On Tue, Nov 13, 2018 at 11:34 AM Greg Mirsky <<= a href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail= .com> wrote:
Hi Anoop,
many thanks for th= e thorough review and detailed comments. Please find my answers, this time = for real, in-line tagged GIM>>.

Regards,
Greg

On Thu, No= v 8, 2018 at 1:58 AM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:

Here= are my comments.

Thanks,
Anoop

=3D=3D

Philosophical
Since VXLAN is not an IETF standard, should we be defining a s= tandard for running BFD on it?=C2=A0 Should we define BFD over Geneve inste= ad which is the official WG selection?=C2=A0 Is that going to be a separate= document?
GIM>> IS-IS is not on the Stan= dard track either but that had not prevented IETF from developing tens of s= tandard track RFCs using RFC 1142 as the normative reference until RFC 7142= re-classified it as historical. A similar path was followed with IS-IS-TE = by publishing RFC 3784 until it was obsoleted by RFC 5305 four years later.= I understand that Down Reference, i.e., using informational RFC as the nor= mative reference, is not an unusual situation.

[ag] OK.=C2=A0 I'm not an exper= t on this part so unless someone else that is an expert (chairs, AD?) can c= omment on it, I'll just let it go.
=C2=A0
=C2=A0

Technical
<= br>
Section 1:

This part needs to be rew= ritten:
>>>
The individual racks may be part of a different Layer 3 network, or they could be in a single Layer 2 network. The VXLAN segments/overlays are overlaid on top of Layer 3 network. A VM can communicate with another VM only if they are on the same VXLAN segment.
>>>
It's hard t= o parse and, given IRB,
GIM>> Would the= following text be acceptable:
OLD TEXT:
=C2=A0 = =C2=A0VXLAN is typically deployed in data centers interconnecting
=C2=A0 =C2=A0virtualized hosts, which may be spread across multiple racks.= =C2=A0 The
=C2=A0 =C2=A0individual racks may be part of a differe= nt Layer 3 network, or they
=C2=A0 =C2=A0could be in a single Lay= er 2 network.=C2=A0 The VXLAN segments/overlays
=C2=A0 =C2=A0are = overlaid on top of Layer 3 network.
NEW TEXT:
VXLAN is typically deployed in data centers interconnect= ing virtualized=C2=A0
hosts of a tenant. VX= LAN addresses requirements of the Layer 2 and=C2=A0
Layer 3 data center network infrastructure in the presence of VMs = in=C2=A0
a multi-tenant environment, discus= sed in section 3 [RFC7348], by
=C2=A0provid= ing Layer 2 overlay scheme on a Layer 3 network.

[ag] This is a lot better.
=C2=A0

=C2=A0A VM can communicate with another VM only if they are on th= e same
VXLAN segment.
the last sentenc= e above is wrong.
GIM>> Section 4 in RFC= 7348 states:
Only VMs within the same VXLAN segment can communic= ate with=C2=A0each other.

[ag] VMs o= n different segments can communicate using routing/IRB, so even RFC 7348 is= wrong.=C2=A0 Perhaps the text should be modified so say -- "In the ab= sence of a router in the overlay, a VM can communicate...".
= =C2=A0
<= div>Section 3:
>>>
=C2=A0= Most deployments will have VMs with only L2 capabilities that
<= span style=3D"color:rgb(0,0,0);font-family:monospace;font-size:13.3333px;wh= ite-space:pre-wrap">may not support L3.
>>>
A= re you suggesting most deployments have VMs with no IP addresses/configurat= ion?
GIM>> Would re-word as follows:
OLD TEXT:
=C2=A0Most deployments will have VMs with only L= 2 capabilities that
=C2=A0may not support L3.
NEW TEXT:=
Deployments may have VMs with only L2 capabilities that do not s= upport L3.=C2=A0
=

[ag] I sti= ll don't understand this.=C2=A0 What does it mean for a VM to not suppo= rt L3?=C2=A0 No IP address, no default GW, something else?
GIM2>> VM communicates with its VTEP which, = in turn, originates VXLAN tunnel. VM is not required to have IP address as = it is VTEP's IP address that VM's MAC is associated with. As for ga= teway, RFC 7348 discusses VXLAN gateway as the device that forwards traffic= e between VXLAN and non-VXLAN domains. Considering all that, would the foll= owing change be acceptable:
OLD TEXT:
=C2=A0Most d= eployments will have VMs with only L2 capabilities that
=C2=A0may= not support L3.
NEW TEXT:
=C2=A0Most deploy= ments will have VMs with only L2 capabilities and not have an IP address as= signed.

[ag2]= Do you have a reference for this (i.e. that most deployments have VMs with= out an IP address)?=C2=A0 Normally I would think VMs would have an IP addre= ss.=C2=A0 It's just that they are segregated into segments and, without= an intervening router, they are restricted to communicate only within thei= r subnet.
=C2=A0

>>><= /div>
Having a hierarchical OAM model helps locali= ze faults though it requires additional consideration.
&g= t;>>
What are the additional considerations?
GIM>> For example, coordinat= ion of BFD intervals across the OAM layers.=C2=A0=C2=A0
<= /div>

[ag] Can we mention them in the draft?
=C2= =A0

Would be useful= to add a reference to RFC 8293 in case the reader would like to know more = about service nodes.
= GIM>> I have to admit that I don't find how RFC 8293=C2=A0=C2=A0A= Framework for Multicast in Network Virtualization over Layer 3 is related = to this document. Please help with additional reference to the text of the = document.=C2=A0=C2=A0

[ag] The RF= C discusses the use of service nodes which is mentioned here.=C2=A0=C2=A0
=C2=A0
<= div dir=3D"ltr">

Sec= tion 4
>>>
Separate BFD sessions can be established between the VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200).
>>>
IMO, the document should mention that this could l= ead to scaling issues given that VTEPs can support well in excess of 4K VNI= s.=C2=A0 Additionally, we should mention that with IRB, a given VNI may not= even exist on the destination VTEP.=C2=A0 Finally, what is the benefit of = doing this?=C2=A0 There may be certain corner cases where it's useful (= vs a single BFD session between the VTEPs for all VNIs) but it would be goo= d to explain what those are.
GIM>> Will add text in the Security Considerations section th= at VTEPs should have limit on number of BFD sessions.=C2=A0

[ag] I was hoping for two things:
- A = mention about the scalability issue right where per-VNI BFD is discussed.= =C2=A0 (Not sure why that is a security issue/consideration.)
GIM2>> I've added the following sente= nse in both places:
The implementation SHOULD have a reasonable u= pper bound on the number of BFD sessions that can be created between the sa= me pair of VTEPs.=C2=A0

=
[ag2] What is the criteria for determining what is reasonable?
=C2=A0
- What is the = benefit of running BFD per VNI between a pair of VTEPs?
GIM2>> An alternative would be to run CFM betwe= en VMs, if there's the need to monitor liveliness of the particular VM.= Again, this is optional.=C2=A0
[ag2] I'm not sure how running per-VNI BFD between the VTE= Ps allows one to monitor the liveliness of VMs.=C2=A0
=C2=A0
=C2=A0

Sections 5.1 and 6.1

In 5.1 we have
>>>
= The inner MAC frame carrying the BFD payload has the
following format:
... Source IP: IP address of the originating VTEP. Destination IP: IP address of the terminating VTEP.
>>>

In 6.1 w= e have=C2=A0
>>>
Since multiple BFD sessions may be running=
 between two
VTEPs, there needs to be a mechanism for demultiplexing received BF
packets to the = proper session. The procedure for demultiplexing packets with Your Discriminator equal to 0 is different from[RFC5880].
For such pack= ets, the BFD session MUST be identified
using the inner headers, =
i.e., the source IP and the destination IP
present in the IP header carried by the payload of the VXLAN
enca=
psulated packet.

>>>
How does th= is work if the source IP and dest IP are the same as specified in 5.1?
GIM>> You're right, Destination and sour= ce IP addresses likely are the same in this case. Will add that the source = UDP port number, along with the pair of IP addresses, MUST be used to demux= received BFD control packets. Would you agree that will be sufficient?=C2= =A0
=

[ag] Yes, I think that should work.= =C2=A0

Editorial<= /div>

[ag] Agree with all c= omments on this section.=C2=A0
=
- Terminology section should be renamed to acronyms.
GIM>> Accepted=C2=A0
- Document would benefit fr= om a thorough editorial scrub, but maybe that will happen once it gets to t= he RFC editor.
GIM>> Will certainly have= helpful comments from ADs and RFC editor.

Section 1
=
>>>
"Virtual eXtensible L= ocal Area Network" (VXLAN) [RFC7348]. provides an encapsulation scheme that allows virtual machines (VMs) to communicate in a data center network.
>>>
This is not accurate.=C2=A0 VXLAN allows you to implement an overlay= to decouple the address space of the attached hosts from that of the netwo= rk.
GIM>> Thank you for the suggested te= xt. Will change as follows:
OLD TEXT:
=C2=A0 =C2=A0&quo= t;Virtual eXtensible Local Area Network" (VXLAN) [RFC7348].=C2=A0 prov= ides
=C2=A0 =C2=A0an encapsulation scheme that allows virtual mac= hines (VMs) to
=C2=A0 =C2=A0communicate in a data center network.= =C2=A0
NEW TEXT:
=C2=A0"Virtual eXtensible Lo= cal Area Network" (VXLAN) [RFC7348].=C2=A0 provides
=C2=A0 = =C2=A0an encapsulation scheme that allows building an overlay network by=C2= =A0
=C2=A0 decoupling the address space of the attached virtual h= osts from that of the network.

Section 7
<= br>
VTEP's -> VTEPs
GIM>> Yes, thank you.=C2=A0
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AGRZ1gLm9gO7DeslMiR02qOI+28+D7vtVd9mAwjgXxGJ7wWyyidgLGhH YFOiwSNUyyYjBrEl8/ty3HmjKVzVTGa04BKCPtE= X-Google-Smtp-Source: AJdET5fiTiDEp/XcfLV2tzHmgEhh69BiP3qIY5fo/a0gYdTX37ouyL9RFlWyqqGyORFVfUTsOf3WMTMnAFWo/gtyNzA= X-Received: by 2002:a19:a149:: with SMTP id k70mr6606494lfe.5.1542418148441; Fri, 16 Nov 2018 17:29:08 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Greg Mirsky Date: Fri, 16 Nov 2018 17:28:55 -0800 Message-ID: Subject: Re: WGLC comments on draft-ietf-bfd-vxlan To: Anoop Ghanwani Cc: rtg-bfd WG , NVO3 Content-Type: multipart/mixed; boundary="000000000000d58891057ad235b2" Archived-At: X-Mailman-Approved-At: Sat, 17 Nov 2018 06:06:43 -0800 X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Nov 2018 01:29:18 -0000 --000000000000d58891057ad235b2 Content-Type: multipart/alternative; boundary="000000000000d5888d057ad235b0" --000000000000d5888d057ad235b0 Content-Type: text/plain; charset="UTF-8" Hi Anoop, thank you for the discussion. Please find my responses tagged GIM3>>. Also, attached diff and the updated working version of the draft. Hope we're converging. Regards, Greg On Wed, Nov 14, 2018 at 11:00 PM Anoop Ghanwani wrote: > Hi Greg, > > Please see inline prefixed with [ag2]. > > Thanks, > Anoop > > On Wed, Nov 14, 2018 at 9:45 AM Greg Mirsky wrote: > >> Hi Anoop, >> thank you for the expedient response. I am glad that some of my responses >> have addressed your concerns. Please find followup notes in-line tagged >> GIM2>>. I've attached the diff to highlight the updates applied in the >> working version. Let me know if these are acceptable changes. >> >> Regards, >> Greg >> >> On Tue, Nov 13, 2018 at 12:30 PM Anoop Ghanwani >> wrote: >> >>> Hi Greg, >>> >>> Please see inline prefixed with [ag]. >>> >>> Thanks, >>> Anoop >>> >>> On Tue, Nov 13, 2018 at 11:34 AM Greg Mirsky >>> wrote: >>> >>>> Hi Anoop, >>>> many thanks for the thorough review and detailed comments. Please find >>>> my answers, this time for real, in-line tagged GIM>>. >>>> >>>> Regards, >>>> Greg >>>> >>>> On Thu, Nov 8, 2018 at 1:58 AM Anoop Ghanwani >>>> wrote: >>>> >>>>> >>>>> Here are my comments. >>>>> >>>>> Thanks, >>>>> Anoop >>>>> >>>>> == >>>>> >>>>> Philosophical >>>>> >>>>> Since VXLAN is not an IETF standard, should we be defining a standard >>>>> for running BFD on it? Should we define BFD over Geneve instead which is >>>>> the official WG selection? Is that going to be a separate document? >>>>> GIM>> IS-IS is not on the Standard track either but that had not >>>>> prevented IETF from developing tens of standard track RFCs using RFC 1142 >>>>> as the normative reference until RFC 7142 re-classified it as historical. A >>>>> similar path was followed with IS-IS-TE by publishing RFC 3784 until it was >>>>> obsoleted by RFC 5305 four years later. I understand that Down Reference, >>>>> i.e., using informational RFC as the normative reference, is not an unusual >>>>> situation. >>>>> >>>> >>> [ag] OK. I'm not an expert on this part so unless someone else that is >>> an expert (chairs, AD?) can comment on it, I'll just let it go. >>> >>> >>>> >>>> >>>>> >>>>> Technical >>>>> >>>>> Section 1: >>>>> >>>>> This part needs to be rewritten: >>>>> >>> >>>>> The individual racks may be part of a different Layer 3 network, or >>>>> they could be in a single Layer 2 network. The VXLAN segments/overlays are >>>>> overlaid on top of Layer 3 network. A VM can communicate with another VM >>>>> only if they are on the same VXLAN segment. >>>>> >>> >>>>> It's hard to parse and, given IRB, >>>>> >>>> GIM>> Would the following text be acceptable: >>>> OLD TEXT: >>>> VXLAN is typically deployed in data centers interconnecting >>>> virtualized hosts, which may be spread across multiple racks. The >>>> individual racks may be part of a different Layer 3 network, or they >>>> could be in a single Layer 2 network. The VXLAN segments/overlays >>>> are overlaid on top of Layer 3 network. >>>> NEW TEXT: >>>> VXLAN is typically deployed in data centers interconnecting virtualized >>>> hosts of a tenant. VXLAN addresses requirements of the Layer 2 and >>>> Layer 3 data center network infrastructure in the presence of VMs in >>>> a multi-tenant environment, discussed in section 3 [RFC7348], by >>>> providing Layer 2 overlay scheme on a Layer 3 network. >>>> >>> >>> [ag] This is a lot better. >>> >>> >>>> >>>> A VM can communicate with another VM only if they are on the same >>>> VXLAN segment. >>>>> >>>>> the last sentence above is wrong. >>>>> >>>> GIM>> Section 4 in RFC 7348 states: >>>> Only VMs within the same VXLAN segment can communicate with each other. >>>> >>> >>> [ag] VMs on different segments can communicate using routing/IRB, so >>> even RFC 7348 is wrong. Perhaps the text should be modified so say -- "In >>> the absence of a router in the overlay, a VM can communicate...". >>> >>> >>>> >>>> Section 3: >>>>> >>> >>>>> Most deployments will have VMs with only L2 capabilities that >>>>> may not support L3. >>>>> >>> >>>>> Are you suggesting most deployments have VMs with no IP >>>>> addresses/configuration? >>>>> >>>> GIM>> Would re-word as follows: >>>> OLD TEXT: >>>> Most deployments will have VMs with only L2 capabilities that >>>> may not support L3. >>>> NEW TEXT: >>>> Deployments may have VMs with only L2 capabilities that do not support >>>> L3. >>>> >>> >>> [ag] I still don't understand this. What does it mean for a VM to not >>> support L3? No IP address, no default GW, something else? >>> >> GIM2>> VM communicates with its VTEP which, in turn, originates VXLAN >> tunnel. VM is not required to have IP address as it is VTEP's IP address >> that VM's MAC is associated with. As for gateway, RFC 7348 discusses VXLAN >> gateway as the device that forwards traffice between VXLAN and non-VXLAN >> domains. Considering all that, would the following change be acceptable: >> OLD TEXT: >> Most deployments will have VMs with only L2 capabilities that >> may not support L3. >> NEW TEXT: >> Most deployments will have VMs with only L2 capabilities and not have an >> IP address assigned. >> > > [ag2] Do you have a reference for this (i.e. that most deployments have > VMs without an IP address)? Normally I would think VMs would have an IP > address. It's just that they are segregated into segments and, without an > intervening router, they are restricted to communicate only within their > subnet. > GIM3>> Would the following text be acceptable: Deployments might have VMs with only L2 capabilities and not have an IP address assigned or, in other cases, VMs are assigned IP address but are restricted to communicate only within their subnet. >>> >>>> >>>>> >>> >>>>> Having a hierarchical OAM model helps localize faults though it >>>>> requires additional consideration. >>>>> >>> >>>>> What are the additional considerations? >>>>> >>>> GIM>> For example, coordination of BFD intervals across the OAM layers. >>>> >>>> >>> >>> [ag] Can we mention them in the draft? >>> >>> >>>> >>>>> Would be useful to add a reference to RFC 8293 in case the reader >>>>> would like to know more about service nodes. >>>>> >>>> GIM>> I have to admit that I don't find how RFC 8293 A Framework for >>>> Multicast in Network Virtualization over Layer 3 is related to this >>>> document. Please help with additional reference to the text of the >>>> document. >>>> >>> >>> [ag] The RFC discusses the use of service nodes which is mentioned >>> here. >>> >>> >>>> >>>>> Section 4 >>>>> >>> >>>>> Separate BFD sessions can be established between the VTEPs (IP1 and >>>>> IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200). >>>>> >>> >>>>> IMO, the document should mention that this could lead to scaling >>>>> issues given that VTEPs can support well in excess of 4K VNIs. >>>>> Additionally, we should mention that with IRB, a given VNI may not even >>>>> exist on the destination VTEP. Finally, what is the benefit of doing >>>>> this? There may be certain corner cases where it's useful (vs a single BFD >>>>> session between the VTEPs for all VNIs) but it would be good to explain >>>>> what those are. >>>>> >>>> GIM>> Will add text in the Security Considerations section that VTEPs >>>> should have limit on number of BFD sessions. >>>> >>> >>> [ag] I was hoping for two things: >>> - A mention about the scalability issue right where per-VNI BFD is >>> discussed. (Not sure why that is a security issue/consideration.) >>> >> GIM2>> I've added the following sentense in both places: >> The implementation SHOULD have a reasonable upper bound on the number of >> BFD sessions that can be created between the same pair of VTEPs. >> > > [ag2] What is the criteria for determining what is reasonable? > GIM>> I usually understand that as requirement to make it controllable, have configurable limit. Thus it will be up to an network operator to set the limit. > > >> - What is the benefit of running BFD per VNI between a pair of VTEPs? >>> >> GIM2>> An alternative would be to run CFM between VMs, if there's the >> need to monitor liveliness of the particular VM. Again, this is optional. >> > > [ag2] I'm not sure how running per-VNI BFD between the VTEPs allows one to > monitor the liveliness of VMs. > > >> >>> >>>> >>>>> Sections 5.1 and 6.1 >>>>> >>>>> In 5.1 we have >>>>> >>> >>>>> The inner MAC frame carrying the BFD payload has the >>>>> following format: >>>>> ... Source IP: IP address of the originating VTEP. Destination IP: IP >>>>> address of the terminating VTEP. >>>>> >>> >>>>> >>>>> In 6.1 we have >>>>> >>> >>>>> >>>>> Since multiple BFD sessions may be running between two >>>>> VTEPs, there needs to be a mechanism for demultiplexing received BF >>>>> >>>>> packets to the proper session. The procedure for demultiplexing >>>>> packets with Your Discriminator equal to 0 is different from[RFC5880 ]. >>>>> >>>>> *For such packets, the BFD session MUST be identified* >>>>> >>>>> *using the inner headers, i.e., the source IP and the destination IP >>>>> present in the IP header carried by the payload of the VXLAN* >>>>> >>>>> *encapsulated packet.* >>>>> >>>>> >>>>> >>> >>>>> How does this work if the source IP and dest IP are the same as >>>>> specified in 5.1? >>>>> >>>> GIM>> You're right, Destination and source IP addresses likely are the >>>> same in this case. Will add that the source UDP port number, along with the >>>> pair of IP addresses, MUST be used to demux received BFD control packets. >>>> Would you agree that will be sufficient? >>>> >>> >>> [ag] Yes, I think that should work. >>> >>>> >>>>> Editorial >>>>> >>>> >>> [ag] Agree with all comments on this section. >>> >>>> >>>>> - Terminology section should be renamed to acronyms. >>>>> >>>> GIM>> Accepted >>>> >>>>> - Document would benefit from a thorough editorial scrub, but maybe >>>>> that will happen once it gets to the RFC editor. >>>>> >>>> GIM>> Will certainly have helpful comments from ADs and RFC editor. >>>> >>>>> >>>>> Section 1 >>>>> >>> >>>>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348 >>>>> ]. provides an encapsulation >>>>> scheme that allows virtual machines (VMs) to communicate in a data center >>>>> network. >>>>> >>> >>>>> This is not accurate. VXLAN allows you to implement an overlay to >>>>> decouple the address space of the attached hosts from that of the network. >>>>> >>>> GIM>> Thank you for the suggested text. Will change as follows: >>>> OLD TEXT: >>>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. provides >>>> an encapsulation scheme that allows virtual machines (VMs) to >>>> communicate in a data center network. >>>> NEW TEXT: >>>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. provides >>>> an encapsulation scheme that allows building an overlay network by >>>> decoupling the address space of the attached virtual hosts from that >>>> of the network. >>>> >>>>> >>>>> Section 7 >>>>> >>>>> VTEP's -> VTEPs >>>>> >>>> GIM>> Yes, thank you. >>>> >>> --000000000000d5888d057ad235b0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Anoop,
thank you for the discussio= n. Please find my responses tagged GIM3>>. Also, attached diff and th= e updated working version of the draft. Hope we're converging.

Regards,
Greg

On Wed, Nov 14, 2018 at 11:00 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
= Hi Greg,

Please see inline prefixed with [ag2].

Thanks,
Anoop

On Wed, Nov 14, 2018 at 9:45 AM Greg Mirs= ky <gregimirs= ky@gmail.com> wrote:
Hi Anoop,
thank you for t= he expedient=C2=A0response. I am glad that some=C2=A0of my responses have a= ddressed your concerns. Please find followup notes in-line tagged GIM2>&= gt;. I've attached the diff to highlight the updates applied in the wor= king version. Let me know if these are acceptable changes.

Regards,
Greg

On Tue, Nov 13, 2018 at 12:30 PM Anoop Ghanwani <anoop@alumni.duke.edu>= ; wrote:
Hi Greg,

Please see inline prefixed with [ag].=

Thanks,
Anoop

On Tue, Nov 13, 2018 at 11:34 AM Greg Mirsky <= gregimirsky@gmai= l.com> wrote:
Hi Anoop,
many thanks for th= e thorough review and detailed comments. Please find my answers, this time = for real, in-line tagged GIM>>.

Regards,
Greg

On Thu, No= v 8, 2018 at 1:58 AM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:

Here= are my comments.

Thanks,
Anoop

=3D=3D

Philosophical
Since VXLAN is not an IETF standard, should we be defining a s= tandard for running BFD on it?=C2=A0 Should we define BFD over Geneve inste= ad which is the official WG selection?=C2=A0 Is that going to be a separate= document?
GIM>> IS-IS is not on the Stan= dard track either but that had not prevented IETF from developing tens of s= tandard track RFCs using RFC 1142 as the normative reference until RFC 7142= re-classified it as historical. A similar path was followed with IS-IS-TE = by publishing RFC 3784 until it was obsoleted by RFC 5305 four years later.= I understand that Down Reference, i.e., using informational RFC as the nor= mative reference, is not an unusual situation.

[ag] OK.=C2=A0 I'm not an exper= t on this part so unless someone else that is an expert (chairs, AD?) can c= omment on it, I'll just let it go.
=C2=A0
=C2=A0

Technical
<= br>
Section 1:

This part needs to be rew= ritten:
>>>
The individual racks may be part of a different Layer 3 network, or they could be in a single Layer 2 network. The VXLAN segments/overlays are overlaid on top of Layer 3 network. A VM can communicate with another VM only if they are on the same VXLAN segment.
>>>
It's hard t= o parse and, given IRB,
GIM>> Would the= following text be acceptable:
OLD TEXT:
=C2=A0 = =C2=A0VXLAN is typically deployed in data centers interconnecting
=C2=A0 =C2=A0virtualized hosts, which may be spread across multiple racks.= =C2=A0 The
=C2=A0 =C2=A0individual racks may be part of a differe= nt Layer 3 network, or they
=C2=A0 =C2=A0could be in a single Lay= er 2 network.=C2=A0 The VXLAN segments/overlays
=C2=A0 =C2=A0are = overlaid on top of Layer 3 network.
NEW TEXT:
VXLAN is typically deployed in data centers interconnect= ing virtualized=C2=A0
hosts of a tenant. VX= LAN addresses requirements of the Layer 2 and=C2=A0
Layer 3 data center network infrastructure in the presence of VMs = in=C2=A0
a multi-tenant environment, discus= sed in section 3 [RFC7348], by
=C2=A0provid= ing Layer 2 overlay scheme on a Layer 3 network.

[ag] This is a lot better.
=C2=A0

=C2=A0A VM can communicate with another VM only if they are on th= e same
VXLAN segment.
the last sentenc= e above is wrong.
GIM>> Section 4 in RFC= 7348 states:
Only VMs within the same VXLAN segment can communic= ate with=C2=A0each other.

[ag] VMs o= n different segments can communicate using routing/IRB, so even RFC 7348 is= wrong.=C2=A0 Perhaps the text should be modified so say -- "In the ab= sence of a router in the overlay, a VM can communicate...".
= =C2=A0
<= div>Section 3:
>>>
=C2=A0= Most deployments will have VMs with only L2 capabilities that
<= span style=3D"color:rgb(0,0,0);font-family:monospace;font-size:13.3333px;wh= ite-space:pre-wrap">may not support L3.
>>>
A= re you suggesting most deployments have VMs with no IP addresses/configurat= ion?
GIM>> Would re-word as follows:
OLD TEXT:
=C2=A0Most deployments will have VMs with only L= 2 capabilities that
=C2=A0may not support L3.
NEW TEXT:=
Deployments may have VMs with only L2 capabilities that do not s= upport L3.=C2=A0
=
<= div dir=3D"ltr">

[ag] I still don't understand this.=C2=A0 What does it mean fo= r a VM to not support L3?=C2=A0 No IP address, no default GW, something els= e?
GIM2>> VM communicates wi= th its VTEP which, in turn, originates VXLAN tunnel. VM is not required to = have IP address as it is VTEP's IP address that VM's MAC is associa= ted with. As for gateway, RFC 7348 discusses VXLAN gateway as the device th= at forwards traffice between VXLAN and non-VXLAN domains. Considering all t= hat, would the following change be acceptable:
OLD TEXT:
=C2=A0Most deployments will have VMs with only L2 capabilities that<= /div>
=C2=A0may not support L3.
NEW TEXT:
=C2=A0Most deployments will have VMs with only L2 capabilities and not ha= ve an IP address assigned.
<= br>
[ag2] Do you have a reference for this (i.e. that most deploy= ments have VMs without an IP address)?=C2=A0 Normally I would think VMs wou= ld have an IP address.=C2=A0 It's just that they are segregated into se= gments and, without an intervening router, they are restricted to communica= te only within their subnet.
GIM3>> Would the following text be acceptable:
Deployments might have VMs with only L2 capabilities = and not have an IP address assigned or,
in other cases, VMs are assigned IP address but are rest= ricted to communicate only within their subnet.=C2=A0=C2=A0
=
=C2=A0
<= br>
>>>
Having a hierarch= ical OAM model helps localize faults though it requires additional consideration.
&g= t;>>
What are the additional considerations?
GIM>> For example, coordinat= ion of BFD intervals across the OAM layers.=C2=A0=C2=A0
<= /div>

[ag] Can we mention them in the draft?
=C2= =A0

Would be useful= to add a reference to RFC 8293 in case the reader would like to know more = about service nodes.
= GIM>> I have to admit that I don't find how RFC 8293=C2=A0=C2=A0A= Framework for Multicast in Network Virtualization over Layer 3 is related = to this document. Please help with additional reference to the text of the = document.=C2=A0=C2=A0

[ag] The RF= C discusses the use of service nodes which is mentioned here.=C2=A0=C2=A0
=C2=A0
<= div dir=3D"ltr">

Sec= tion 4
>>>
Separate BFD sessions can be established between the VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200).
>>>
IMO, the document should mention that this could l= ead to scaling issues given that VTEPs can support well in excess of 4K VNI= s.=C2=A0 Additionally, we should mention that with IRB, a given VNI may not= even exist on the destination VTEP.=C2=A0 Finally, what is the benefit of = doing this?=C2=A0 There may be certain corner cases where it's useful (= vs a single BFD session between the VTEPs for all VNIs) but it would be goo= d to explain what those are.
GIM>> Will add text in the Security Considerations section th= at VTEPs should have limit on number of BFD sessions.=C2=A0

[ag] I was hoping for two things:
- A = mention about the scalability issue right where per-VNI BFD is discussed.= =C2=A0 (Not sure why that is a security issue/consideration.)
GIM2>> I've added the following sente= nse in both places:
The implementation SHOULD have a reasonable u= pper bound on the number of BFD sessions that can be created between the sa= me pair of VTEPs.=C2=A0

=
[ag2] What is the criteria for determining what is reasonable?
GIM>> I usually understand th= at as requirement to make it controllable, have configurable limit. Thus it= will be up to an network operator to set the limit.=C2=A0
=C2=A0
=
- What is the benefit of running BFD p= er VNI between a pair of VTEPs?
GI= M2>> An alternative would be to run CFM between VMs, if there's t= he need to monitor liveliness of the particular VM. Again, this is optional= .=C2=A0

[ag2] I'= ;m not sure how running per-VNI BFD between the VTEPs allows one to monitor= the liveliness of VMs.=C2=A0
=C2=A0
=C2=A0

Sections 5.1 and 6.1

In 5.1 we have
>>>
The i= nner MAC frame carrying the BFD payload has the
foll= owing format:
... Source IP: IP address of the originating VTEP. Destination IP: IP address of the terminating VTEP.
>>>
=

In 6.1 we have=C2=A0
>>>
<= pre class=3D"gmail-m_-6995123109713790995m_-618924820585214784m_49438050311= 85443502gmail-m_-4014731856997763599m_3305905075503179058m_3738381183992508= 565gmail-m_2120889048547072597gmail-newpage" style=3D"font-size:13.3333px;m= argin-top:0px;margin-bottom:0px;display:inline-block;break-before:page;colo= r:rgb(0,0,0)">Since multiple BFD sessions may be running between two VTEPs, there needs to be a mechanism for demultiplexing received BFpackets to the proper session. The procedure for demultiplexi= ng packets with Your Discriminator equal to 0 is different from[RFC5880].
For such packets, the BFD session MUST be identified
using the inner headers, i.e., the source IP=
 and the destination IP
present in the IP header carried by the payload of the VXLAN
encapsulated packet.

>&g= t;>
How does this work if the source IP and dest IP are the sa= me as specified in 5.1?
GIM>> You're= right, Destination and source IP addresses likely are the same in this cas= e. Will add that the source UDP port number, along with the pair of IP addr= esses, MUST be used to demux received BFD control packets. Would you agree = that will be sufficient?=C2=A0

[ag] Yes,= I think that should work.=C2=A0
<= div dir=3D"ltr">
<= br>
Editorial

[ag] Agree with all comments on this section.=C2=A0
<= div dir=3D"ltr">

- Terminology section should be renamed= to acronyms.
GIM>> Accepted=C2=A0
=
- D= ocument would benefit from a thorough editorial scrub, but maybe that will = happen once it gets to the RFC editor.
GIM>= > Will certainly have helpful comments from ADs and RFC editor.

Section 1
>>>
&q= uot;Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. provides an encapsulation scheme that allows virtual machines (VMs) to communicate in a data center network.
>>>
This is not accurate.=C2=A0 VXLAN allows you to implement an overlay= to decouple the address space of the attached hosts from that of the netwo= rk.
GIM>> Thank you for the suggested te= xt. Will change as follows:
OLD TEXT:
=C2=A0 =C2=A0&quo= t;Virtual eXtensible Local Area Network" (VXLAN) [RFC7348].=C2=A0 prov= ides
=C2=A0 =C2=A0an encapsulation scheme that allows virtual mac= hines (VMs) to
=C2=A0 =C2=A0communicate in a data center network.= =C2=A0
NEW TEXT:
=C2=A0"Virtual eXtensible Lo= cal Area Network" (VXLAN) [RFC7348].=C2=A0 provides
=C2=A0 = =C2=A0an encapsulation scheme that allows building an overlay network by=C2= =A0
=C2=A0 decoupling the address space of the attached virtual h= osts from that of the network.

Section 7
<= br>
VTEP's -> VTEPs
GIM>> Yes, thank you.=C2=A0
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13mr1489103vkp.21.1542744896715; Tue, 20 Nov 2018 12:14:56 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Anoop Ghanwani Date: Tue, 20 Nov 2018 12:14:42 -0800 Message-ID: Subject: Re: WGLC comments on draft-ietf-bfd-vxlan To: Greg Mirsky Cc: rtg-bfd@ietf.org, nvo3@ietf.org Content-Type: multipart/alternative; boundary="0000000000008c42b6057b1e4944" Archived-At: X-Mailman-Approved-At: Tue, 20 Nov 2018 12:20:26 -0800 X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Nov 2018 20:15:06 -0000 --0000000000008c42b6057b1e4944 Content-Type: text/plain; charset="UTF-8" Hi Greg, Please see inline prefixed by [ag3]. Thanks, Anoop On Fri, Nov 16, 2018 at 5:29 PM Greg Mirsky wrote: > Hi Anoop, > thank you for the discussion. Please find my responses tagged GIM3>>. > Also, attached diff and the updated working version of the draft. Hope > we're converging. > > Regards, > Greg > > On Wed, Nov 14, 2018 at 11:00 PM Anoop Ghanwani > wrote: > >> Hi Greg, >> >> Please see inline prefixed with [ag2]. >> >> Thanks, >> Anoop >> >> On Wed, Nov 14, 2018 at 9:45 AM Greg Mirsky >> wrote: >> >>> Hi Anoop, >>> thank you for the expedient response. I am glad that some of my >>> responses have addressed your concerns. Please find followup notes in-line >>> tagged GIM2>>. I've attached the diff to highlight the updates applied in >>> the working version. Let me know if these are acceptable changes. >>> >>> Regards, >>> Greg >>> >>> On Tue, Nov 13, 2018 at 12:30 PM Anoop Ghanwani >>> wrote: >>> >>>> Hi Greg, >>>> >>>> Please see inline prefixed with [ag]. >>>> >>>> Thanks, >>>> Anoop >>>> >>>> On Tue, Nov 13, 2018 at 11:34 AM Greg Mirsky >>>> wrote: >>>> >>>>> Hi Anoop, >>>>> many thanks for the thorough review and detailed comments. Please find >>>>> my answers, this time for real, in-line tagged GIM>>. >>>>> >>>>> Regards, >>>>> Greg >>>>> >>>>> On Thu, Nov 8, 2018 at 1:58 AM Anoop Ghanwani >>>>> wrote: >>>>> >>>>>> >>>>>> Here are my comments. >>>>>> >>>>>> Thanks, >>>>>> Anoop >>>>>> >>>>>> == >>>>>> >>>>>> Philosophical >>>>>> >>>>>> Since VXLAN is not an IETF standard, should we be defining a standard >>>>>> for running BFD on it? Should we define BFD over Geneve instead which is >>>>>> the official WG selection? Is that going to be a separate document? >>>>>> GIM>> IS-IS is not on the Standard track either but that had not >>>>>> prevented IETF from developing tens of standard track RFCs using RFC 1142 >>>>>> as the normative reference until RFC 7142 re-classified it as historical. A >>>>>> similar path was followed with IS-IS-TE by publishing RFC 3784 until it was >>>>>> obsoleted by RFC 5305 four years later. I understand that Down Reference, >>>>>> i.e., using informational RFC as the normative reference, is not an unusual >>>>>> situation. >>>>>> >>>>> >>>> [ag] OK. I'm not an expert on this part so unless someone else that is >>>> an expert (chairs, AD?) can comment on it, I'll just let it go. >>>> >>>> >>>>> >>>>> >>>>>> >>>>>> Technical >>>>>> >>>>>> Section 1: >>>>>> >>>>>> This part needs to be rewritten: >>>>>> >>> >>>>>> The individual racks may be part of a different Layer 3 network, or >>>>>> they could be in a single Layer 2 network. The VXLAN segments/overlays are >>>>>> overlaid on top of Layer 3 network. A VM can communicate with another VM >>>>>> only if they are on the same VXLAN segment. >>>>>> >>> >>>>>> It's hard to parse and, given IRB, >>>>>> >>>>> GIM>> Would the following text be acceptable: >>>>> OLD TEXT: >>>>> VXLAN is typically deployed in data centers interconnecting >>>>> virtualized hosts, which may be spread across multiple racks. The >>>>> individual racks may be part of a different Layer 3 network, or they >>>>> could be in a single Layer 2 network. The VXLAN segments/overlays >>>>> are overlaid on top of Layer 3 network. >>>>> NEW TEXT: >>>>> VXLAN is typically deployed in data centers interconnecting >>>>> virtualized >>>>> hosts of a tenant. VXLAN addresses requirements of the Layer 2 and >>>>> Layer 3 data center network infrastructure in the presence of VMs in >>>>> a multi-tenant environment, discussed in section 3 [RFC7348], by >>>>> providing Layer 2 overlay scheme on a Layer 3 network. >>>>> >>>> >>>> [ag] This is a lot better. >>>> >>>> >>>>> >>>>> A VM can communicate with another VM only if they are on the same >>>>> VXLAN segment. >>>>>> >>>>>> the last sentence above is wrong. >>>>>> >>>>> GIM>> Section 4 in RFC 7348 states: >>>>> Only VMs within the same VXLAN segment can communicate with each other. >>>>> >>>> >>>> [ag] VMs on different segments can communicate using routing/IRB, so >>>> even RFC 7348 is wrong. Perhaps the text should be modified so say -- "In >>>> the absence of a router in the overlay, a VM can communicate...". >>>> >>>> >>>>> >>>>> Section 3: >>>>>> >>> >>>>>> Most deployments will have VMs with only L2 capabilities that >>>>>> may not support L3. >>>>>> >>> >>>>>> Are you suggesting most deployments have VMs with no IP >>>>>> addresses/configuration? >>>>>> >>>>> GIM>> Would re-word as follows: >>>>> OLD TEXT: >>>>> Most deployments will have VMs with only L2 capabilities that >>>>> may not support L3. >>>>> NEW TEXT: >>>>> Deployments may have VMs with only L2 capabilities that do not support >>>>> L3. >>>>> >>>> >>>> [ag] I still don't understand this. What does it mean for a VM to not >>>> support L3? No IP address, no default GW, something else? >>>> >>> GIM2>> VM communicates with its VTEP which, in turn, originates VXLAN >>> tunnel. VM is not required to have IP address as it is VTEP's IP address >>> that VM's MAC is associated with. As for gateway, RFC 7348 discusses VXLAN >>> gateway as the device that forwards traffice between VXLAN and non-VXLAN >>> domains. Considering all that, would the following change be acceptable: >>> OLD TEXT: >>> Most deployments will have VMs with only L2 capabilities that >>> may not support L3. >>> NEW TEXT: >>> Most deployments will have VMs with only L2 capabilities and not have >>> an IP address assigned. >>> >> >> [ag2] Do you have a reference for this (i.e. that most deployments have >> VMs without an IP address)? Normally I would think VMs would have an IP >> address. It's just that they are segregated into segments and, without an >> intervening router, they are restricted to communicate only within their >> subnet. >> > GIM3>> Would the following text be acceptable: > > Deployments might have VMs with only L2 capabilities and not have an IP > address assigned or, > in other cases, VMs are assigned IP address but are restricted to > communicate only within their subnet. > > [ag3] Yes, this is better. >>>> >>>>> >>>>>> >>> >>>>>> Having a hierarchical OAM model helps localize faults though it >>>>>> requires additional consideration. >>>>>> >>> >>>>>> What are the additional considerations? >>>>>> >>>>> GIM>> For example, coordination of BFD intervals across the OAM >>>>> layers. >>>>> >>>> >>>> [ag] Can we mention them in the draft? >>>> >>>> >>>>> >>>>>> Would be useful to add a reference to RFC 8293 in case the reader >>>>>> would like to know more about service nodes. >>>>>> >>>>> GIM>> I have to admit that I don't find how RFC 8293 A Framework for >>>>> Multicast in Network Virtualization over Layer 3 is related to this >>>>> document. Please help with additional reference to the text of the >>>>> document. >>>>> >>>> >>>> [ag] The RFC discusses the use of service nodes which is mentioned >>>> here. >>>> >>>> >>>>> >>>>>> Section 4 >>>>>> >>> >>>>>> Separate BFD sessions can be established between the VTEPs (IP1 and >>>>>> IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200). >>>>>> >>> >>>>>> IMO, the document should mention that this could lead to scaling >>>>>> issues given that VTEPs can support well in excess of 4K VNIs. >>>>>> Additionally, we should mention that with IRB, a given VNI may not even >>>>>> exist on the destination VTEP. Finally, what is the benefit of doing >>>>>> this? There may be certain corner cases where it's useful (vs a single BFD >>>>>> session between the VTEPs for all VNIs) but it would be good to explain >>>>>> what those are. >>>>>> >>>>> GIM>> Will add text in the Security Considerations section that VTEPs >>>>> should have limit on number of BFD sessions. >>>>> >>>> >>>> [ag] I was hoping for two things: >>>> - A mention about the scalability issue right where per-VNI BFD is >>>> discussed. (Not sure why that is a security issue/consideration.) >>>> >>> GIM2>> I've added the following sentense in both places: >>> The implementation SHOULD have a reasonable upper bound on the number of >>> BFD sessions that can be created between the same pair of VTEPs. >>> >> >> [ag2] What is the criteria for determining what is reasonable? >> > GIM>> I usually understand that as requirement to make it controllable, > have configurable limit. Thus it will be up to an network operator to set > the limit. > >> >> >>> - What is the benefit of running BFD per VNI between a pair of VTEPs? >>>> >>> GIM2>> An alternative would be to run CFM between VMs, if there's the >>> need to monitor liveliness of the particular VM. Again, this is optional. >>> >> >> [ag2] I'm not sure how running per-VNI BFD between the VTEPs allows one >> to monitor the liveliness of VMs. >> > [ag3] I think you missed responding to this. I'm not sure of the value of running BFD per VNI between VTEPs. What am I getting that is not covered by running a single BFD session with VNI 0 between the VTEPs? > >> >>> >>>> >>>>> >>>>>> Sections 5.1 and 6.1 >>>>>> >>>>>> In 5.1 we have >>>>>> >>> >>>>>> The inner MAC frame carrying the BFD payload has the >>>>>> following format: >>>>>> ... Source IP: IP address of the originating VTEP. Destination IP: IP >>>>>> address of the terminating VTEP. >>>>>> >>> >>>>>> >>>>>> In 6.1 we have >>>>>> >>> >>>>>> >>>>>> Since multiple BFD sessions may be running between two >>>>>> VTEPs, there needs to be a mechanism for demultiplexing received BF >>>>>> >>>>>> packets to the proper session. The procedure for demultiplexing >>>>>> packets with Your Discriminator equal to 0 is different from[RFC5880 ]. >>>>>> >>>>>> *For such packets, the BFD session MUST be identified* >>>>>> >>>>>> *using the inner headers, i.e., the source IP and the destination IP >>>>>> present in the IP header carried by the payload of the VXLAN* >>>>>> >>>>>> *encapsulated packet.* >>>>>> >>>>>> >>>>>> >>> >>>>>> How does this work if the source IP and dest IP are the same as >>>>>> specified in 5.1? >>>>>> >>>>> GIM>> You're right, Destination and source IP addresses likely are the >>>>> same in this case. Will add that the source UDP port number, along with the >>>>> pair of IP addresses, MUST be used to demux received BFD control packets. >>>>> Would you agree that will be sufficient? >>>>> >>>> >>>> [ag] Yes, I think that should work. >>>> >>>>> >>>>>> Editorial >>>>>> >>>>> >>>> [ag] Agree with all comments on this section. >>>> >>>>> >>>>>> - Terminology section should be renamed to acronyms. >>>>>> >>>>> GIM>> Accepted >>>>> >>>>>> - Document would benefit from a thorough editorial scrub, but maybe >>>>>> that will happen once it gets to the RFC editor. >>>>>> >>>>> GIM>> Will certainly have helpful comments from ADs and RFC editor. >>>>> >>>>>> >>>>>> Section 1 >>>>>> >>> >>>>>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348 >>>>>> ]. provides an encapsulation >>>>>> scheme that allows virtual machines (VMs) to communicate in a data center >>>>>> network. >>>>>> >>> >>>>>> This is not accurate. VXLAN allows you to implement an overlay to >>>>>> decouple the address space of the attached hosts from that of the network. >>>>>> >>>>> GIM>> Thank you for the suggested text. Will change as follows: >>>>> OLD TEXT: >>>>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. provides >>>>> an encapsulation scheme that allows virtual machines (VMs) to >>>>> communicate in a data center network. >>>>> NEW TEXT: >>>>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. provides >>>>> an encapsulation scheme that allows building an overlay network by >>>>> decoupling the address space of the attached virtual hosts from that >>>>> of the network. >>>>> >>>>>> >>>>>> Section 7 >>>>>> >>>>>> VTEP's -> VTEPs >>>>>> >>>>> GIM>> Yes, thank you. >>>>> >>>> --0000000000008c42b6057b1e4944 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Greg,

Please see inline prefixed by = [ag3].

Thanks,
Anoop

On Fri, Nov 16, 2018 at 5:29 PM Greg= Mirsky <gregimirsky@gmail.com<= /a>> wrote:
Hi Anoop,
thank you for the discussion. Please find my re= sponses tagged GIM3>>. Also, attached diff and the updated working ve= rsion of the draft. Hope we're converging.

Reg= ards,
Greg

Hi= Greg,

Please see inline prefixed with [ag2].
=
Thanks,
Anoop

On Wed, Nov 14, 2018 at 9:45 AM Greg Mirs= ky <gregimirs= ky@gmail.com> wrote:
Hi Anoop,
thank you for t= he expedient=C2=A0response. I am glad that some=C2=A0of my responses have a= ddressed your concerns. Please find followup notes in-line tagged GIM2>&= gt;. I've attached the diff to highlight the updates applied in the wor= king version. Let me know if these are acceptable changes.

Regards,
Greg

On Tue, Nov 13, 2018 at 12:30 PM Anoop Ghanwani <anoop@alumni.duke.edu>= ; wrote:
Hi Greg,

Please see inline prefixed with [ag].=

Thanks,
Anoop

On Tue, Nov 13, 2018 at 11:34 AM Greg Mirsky <= gregimirsky@gmai= l.com> wrote:
Hi Anoop,
many thanks for th= e thorough review and detailed comments. Please find my answers, this time = for real, in-line tagged GIM>>.

Regards,
Greg

On Thu, No= v 8, 2018 at 1:58 AM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:

Here= are my comments.

Thanks,
Anoop

=3D=3D

Philosophical
Since VXLAN is not an IETF standard, should we be defining a s= tandard for running BFD on it?=C2=A0 Should we define BFD over Geneve inste= ad which is the official WG selection?=C2=A0 Is that going to be a separate= document?
GIM>> IS-IS is not on the Stan= dard track either but that had not prevented IETF from developing tens of s= tandard track RFCs using RFC 1142 as the normative reference until RFC 7142= re-classified it as historical. A similar path was followed with IS-IS-TE = by publishing RFC 3784 until it was obsoleted by RFC 5305 four years later.= I understand that Down Reference, i.e., using informational RFC as the nor= mative reference, is not an unusual situation.

[ag] OK.=C2=A0 I'm not an exper= t on this part so unless someone else that is an expert (chairs, AD?) can c= omment on it, I'll just let it go.
=C2=A0
=C2=A0

Technical
<= br>
Section 1:

This part needs to be rew= ritten:
>>>
The individual racks may be part of a different Layer 3 network, or they could be in a single Layer 2 network. The VXLAN segments/overlays are overlaid on top of Layer 3 network. A VM can communicate with another VM only if they are on the same VXLAN segment.
>>>
It's hard t= o parse and, given IRB,
GIM>> Would the= following text be acceptable:
OLD TEXT:
=C2=A0 = =C2=A0VXLAN is typically deployed in data centers interconnecting
=C2=A0 =C2=A0virtualized hosts, which may be spread across multiple racks.= =C2=A0 The
=C2=A0 =C2=A0individual racks may be part of a differe= nt Layer 3 network, or they
=C2=A0 =C2=A0could be in a single Lay= er 2 network.=C2=A0 The VXLAN segments/overlays
=C2=A0 =C2=A0are = overlaid on top of Layer 3 network.
NEW TEXT:
VXLAN is typically deployed in data centers interconnect= ing virtualized=C2=A0
hosts of a tenant. VX= LAN addresses requirements of the Layer 2 and=C2=A0
Layer 3 data center network infrastructure in the presence of VMs = in=C2=A0
a multi-tenant environment, discus= sed in section 3 [RFC7348], by
=C2=A0provid= ing Layer 2 overlay scheme on a Layer 3 network.

[ag] This is a lot better.
=C2=A0

=C2=A0A VM can communicate with another VM only if they are on th= e same
VXLAN segment.
the last sentenc= e above is wrong.
GIM>> Section 4 in RFC= 7348 states:
Only VMs within the same VXLAN segment can communic= ate with=C2=A0each other.

[ag] VMs o= n different segments can communicate using routing/IRB, so even RFC 7348 is= wrong.=C2=A0 Perhaps the text should be modified so say -- "In the ab= sence of a router in the overlay, a VM can communicate...".
= =C2=A0
<= div>Section 3:
>>>
=C2=A0= Most deployments will have VMs with only L2 capabilities that
<= span style=3D"color:rgb(0,0,0);font-family:monospace;font-size:13.3333px;wh= ite-space:pre-wrap">may not support L3.
>>>
A= re you suggesting most deployments have VMs with no IP addresses/configurat= ion?
GIM>> Would re-word as follows:
OLD TEXT:
=C2=A0Most deployments will have VMs with only L= 2 capabilities that
=C2=A0may not support L3.
NEW TEXT:=
Deployments may have VMs with only L2 capabilities that do not s= upport L3.=C2=A0
=
<= div dir=3D"ltr">

[ag] I still don't understand this.=C2=A0 What does it mean fo= r a VM to not support L3?=C2=A0 No IP address, no default GW, something els= e?
GIM2>> VM communicates wi= th its VTEP which, in turn, originates VXLAN tunnel. VM is not required to = have IP address as it is VTEP's IP address that VM's MAC is associa= ted with. As for gateway, RFC 7348 discusses VXLAN gateway as the device th= at forwards traffice between VXLAN and non-VXLAN domains. Considering all t= hat, would the following change be acceptable:
OLD TEXT:
=C2=A0Most deployments will have VMs with only L2 capabilities that<= /div>
=C2=A0may not support L3.
NEW TEXT:
=C2=A0Most deployments will have VMs with only L2 capabilities and not ha= ve an IP address assigned.
<= br>
[ag2] Do you have a reference for this (i.e. that most deploy= ments have VMs without an IP address)?=C2=A0 Normally I would think VMs wou= ld have an IP address.=C2=A0 It's just that they are segregated into se= gments and, without an intervening router, they are restricted to communica= te only within their subnet.
GIM3>> Would the following text be acceptable:
Deployments might have VMs with only L2 capabilities = and not have an IP address assigned or,
in other cases, VMs are assigned IP address but are rest= ricted to communicate only within their subnet.=C2=A0=C2=A0

[ag3] Yes, this is be= tter.

<= div dir=3D"ltr">
= =C2=A0

>>>
Having a hierarchical OAM mode= l helps localize faults though it requires additional consideration.
&g= t;>>
What are the additional considerations?
GIM>> For example, coordinat= ion of BFD intervals across the OAM layers.=C2=A0=C2=A0
<= /div>

[ag] Can we mention them in the draft?
=C2= =A0

Would be useful= to add a reference to RFC 8293 in case the reader would like to know more = about service nodes.
= GIM>> I have to admit that I don't find how RFC 8293=C2=A0=C2=A0A= Framework for Multicast in Network Virtualization over Layer 3 is related = to this document. Please help with additional reference to the text of the = document.=C2=A0=C2=A0

[ag] The RF= C discusses the use of service nodes which is mentioned here.=C2=A0=C2=A0
=C2=A0
<= div dir=3D"ltr">

Sec= tion 4
>>>
Separate BFD sessions can be established between the VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200).
>>>
IMO, the document should mention that this could l= ead to scaling issues given that VTEPs can support well in excess of 4K VNI= s.=C2=A0 Additionally, we should mention that with IRB, a given VNI may not= even exist on the destination VTEP.=C2=A0 Finally, what is the benefit of = doing this?=C2=A0 There may be certain corner cases where it's useful (= vs a single BFD session between the VTEPs for all VNIs) but it would be goo= d to explain what those are.
GIM>> Will add text in the Security Considerations section th= at VTEPs should have limit on number of BFD sessions.=C2=A0

[ag] I was hoping for two things:
- A = mention about the scalability issue right where per-VNI BFD is discussed.= =C2=A0 (Not sure why that is a security issue/consideration.)
GIM2>> I've added the following sente= nse in both places:
The implementation SHOULD have a reasonable u= pper bound on the number of BFD sessions that can be created between the sa= me pair of VTEPs.=C2=A0

=
[ag2] What is the criteria for determining what is reasonable?
GIM>> I usually understand th= at as requirement to make it controllable, have configurable limit. Thus it= will be up to an network operator to set the limit.=C2=A0
=C2=A0
=
- What is the benefit of running BFD p= er VNI between a pair of VTEPs?
GI= M2>> An alternative would be to run CFM between VMs, if there's t= he need to monitor liveliness of the particular VM. Again, this is optional= .=C2=A0

[ag2] I'= ;m not sure how running per-VNI BFD between the VTEPs allows one to monitor= the liveliness of VMs.=C2=A0

[ag3] I think you missed re= sponding to this.=C2=A0 I'm not sure of the value of running BFD per VN= I between VTEPs.=C2=A0 What am I getting that is not covered by running a s= ingle BFD session with VNI 0 between the VTEPs?
=C2=A0
=C2=A0
=C2=A0
<= div dir=3D"ltr">

Sections 5.1 and 6.1
<= div>
In 5.1 we have
>>>
The inner MAC frame carrying the BFD payload has the
following format:
... Source IP: IP address of the originating VTEP. Destination IP: IP address of the terminating VTEP.
>>>

In 6.1 we have=C2=A0
>= ;>>
Since multiple BFD =
sessions may be running between two
VTEPs, there needs to be a mechanism for demultiplexing received BF
packets to the proper session. The proce= dure for demultiplexing packets with Your Discriminator equal to 0 is different from[RFC5880].
For such packets, the BFD session MUST = be identified
us=
ing the inner headers, i.e., the source IP and the destination IP
present in the IP header carried by the payload of the VXLAN
encapsulated packet.
=
>>>
How does this work if the source IP a= nd dest IP are the same as specified in 5.1?
G= IM>> You're right, Destination and source IP addresses likely are= the same in this case. Will add that the source UDP port number, along wit= h the pair of IP addresses, MUST be used to demux received BFD control pack= ets. Would you agree that will be sufficient?=C2=A0
=
[ag] Yes, I think that should work.=C2=A0

Editorial
=

[ag] Agree with all comments on this section.=C2=A0=

- Terminology sec= tion should be renamed to acronyms.
GIM>>= ; Accepted=C2=A0
- Document would benefit from a thorough editorial scrub= , but maybe that will happen once it gets to the RFC editor.
GIM>> Will certainly have helpful comments from ADs an= d RFC editor.

Section 1
>>>
<= span style=3D"color:rgb(0,0,0);font-family:monospace;font-size:13.3333px;wh= ite-space:pre-wrap">"Virtual eXtensible Local Area Network" (VXLA= N) [RFC= 7348]. provides an encapsulation scheme that allows virtual machines (VMs) to communicate in a data center network.
>>>
This is not accurate.=C2=A0 VXLAN allows you to implement an overlay= to decouple the address space of the attached hosts from that of the netwo= rk.
GIM>> Thank you for the suggested te= xt. Will change as follows:
OLD TEXT:
=C2=A0 =C2=A0&quo= t;Virtual eXtensible Local Area Network" (VXLAN) [RFC7348].=C2=A0 prov= ides
=C2=A0 =C2=A0an encapsulation scheme that allows virtual mac= hines (VMs) to
=C2=A0 =C2=A0communicate in a data center network.= =C2=A0
NEW TEXT:
=C2=A0"Virtual eXtensible Lo= cal Area Network" (VXLAN) [RFC7348].=C2=A0 provides
=C2=A0 = =C2=A0an encapsulation scheme that allows building an overlay network by=C2= =A0
=C2=A0 decoupling the address space of the attached virtual h= osts from that of the network.

Section 7
<= br>
VTEP's -> VTEPs
GIM>> Yes, thank you.=C2=A0
--0000000000008c42b6057b1e4944-- From nobody Tue Nov 20 14:01:24 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 49E19130E29; Tue, 20 Nov 2018 14:01:15 -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 FhwqMOcCQaAm; Tue, 20 Nov 2018 14:01:11 -0800 (PST) Received: from mail-lj1-x230.google.com (mail-lj1-x230.google.com [IPv6:2a00:1450:4864:20::230]) (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 7B6D2130DFF; Tue, 20 Nov 2018 14:01:10 -0800 (PST) Received: by mail-lj1-x230.google.com with SMTP id u6-v6so3038646ljd.1; Tue, 20 Nov 2018 14:01:10 -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=aC0h1vPBc6gfpGJ2LckAz51ZgEMnT4RRuApVGENeq8A=; b=jHwBNexq8X5hX6kKRMZOZQk6UF4N+IipXbrvgBvOklme0uP+ONNqNMHBJeSHmnH4LW ZpcOGucB/VHw2YE5IqUpaZsh46xNDzGvss5dUwKKoA+iVH8RNktDTemUf8B6LEIu1IX1 0tC0bhejwghRIE6qhZDidm2Yx+VvGpHAc+d+CvmKs6nwvIvYDNZTqeLnZeieaxUeN9cL ON6jE/kadh5xfWhC1AomEK1ONAqIs6y5FLoRdj5RrQZGc8Xo4+2ZDgfvxzF4aDc1jBAC M+B4hQzGvVwVHdJvrI3q4OVRosIsA7BIjyB/p82bmaXap6U0OFCRemZUBDpbSBv71QQz 2qcA== 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=aC0h1vPBc6gfpGJ2LckAz51ZgEMnT4RRuApVGENeq8A=; b=mphFl37tbVeERZ4EBYxLg6vAV8gqR5TTEt+qD+vdtdC4EJHOSgMRqqB9D18kKv+N+f q0SA3b6E++MMoV3ttANqWD3GCt28m4tK7/EdxbtbfOjJ6QdsMb2YyITskC5cFd4fUTD+ a2uH/JWKmoX94/xjevbWBV6vQxl/lT0KhaQPQHEzfoW+Bo8+gj4JXGBU8nfAEs5FnM+2 oj4y5W+Ocrq8CFfUaHlwDT9gS841TG/P3MipelLWAErZYQx8YcL5N3HQY4YOxzWPJu0k h8FORqzrma4vRhrQ8SycaqcGhzqgfsvrkmO0qylExnCRdHnc7KMNqyM7fVtQGYbS/5yF oa1Q== X-Gm-Message-State: AA+aEWab0nHm7L9DPETU0pTiSFXdgprQ2yFbE7i3rhx/NEpmwhEmn4mY HXuwNKvZTIKdtmT5D1e0MGVOdWAaB/SJfTRwjgc= X-Google-Smtp-Source: AFSGD/UyC4OETb54DpijBF1OoVOGtdK3ZPojy5naYQu6qJ/YjLxVcY/khYSgUd/aiSZ9z42HUPvJqR6Jqcory1ZfGP8= X-Received: by 2002:a2e:851a:: with SMTP id j26-v6mr2222938lji.163.1542751268404; Tue, 20 Nov 2018 14:01:08 -0800 (PST) MIME-Version: 1.0 References: <15CB10A6-6AF4-460F-A71D-56F28D9D7784@cisco.com> <5BFD9FF7-DBF8-48E6-BF45-1D29AFB90034@cisco.com> <81371D06-2A1A-480F-B65D-FAF04E408A04@cisco.com> In-Reply-To: <81371D06-2A1A-480F-B65D-FAF04E408A04@cisco.com> From: Greg Mirsky Date: Tue, 20 Nov 2018 14:00:57 -0800 Message-ID: Subject: Re: [mpls] MPLS WG adoption call for draft-mirsky-mpls-p2mp-bfd To: "Carlos Pignataro (cpignata)" Cc: mpls-chairs@ietf.org, mpls@ietf.org, rtg-bfd WG Content-Type: multipart/alternative; boundary="000000000000548c5a057b1fc5d3" Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Nov 2018 22:01:16 -0000 --000000000000548c5a057b1fc5d3 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Carlos, apologies for the prolonged silence. Thank you for your consideration of the proposed new text and the acknowledgment that we're converging. Please find the new comments in-line tagged GIM3>>. Regards, Greg On Wed, Nov 7, 2018 at 8:52 PM Carlos Pignataro (cpignata) < cpignata@cisco.com> wrote: > [Greg, Loa, responding to both on this single email reply] > > Hi, Loa, > > On Nov 6, 2018, at 1:49 PM, Loa Andersson wrote: > > Carlos, > > Since the a wg adoption poll I read your comments as that we are doing > progress, and that we can address the rest during the wg process, > correct? > > > I agree we are making progress, thank you. Most questions can be addresse= d > later, but only the very first question goes to the heart of an adoption > poll. If we can close on that, the rest can be addressed later (note the > same question is related also to the last question.) > > /Loa > > > Hi, Greg, > > Thank you very much for your responses =E2=80=94 please see inline. > > On Nov 6, 2018, at 7:18 PM, Greg Mirsky wrote: > > Hi Carlos, > thank you for your consideration of my responses. Glad that we're > converging. Please find additional notes in-line tagged GIM2>>. > > Regards, > Greg > > On Tue, Nov 6, 2018 at 12:11 AM Carlos Pignataro (cpignata) < > cpignata@cisco.com> wrote: > >> Hi Greg, >> >> Many thanks for your response and suggestions! Please see inline. >> >> On Nov 2, 2018, at 6:13 AM, Greg Mirsky wrote: >> >> Hi Carlos, >> thank you for your comments. Please find my notes, answers in-line tagge= d >> GIM>>. >> >> Regards, >> Greg >> >> On Thu, Oct 25, 2018 at 8:47 PM Carlos Pignataro (cpignata) < >> cpignata@cisco.com> wrote: >> >>> Hi, >>> >>> Cc BFD WG >>> >>> It would be useful to understand the use case motivation or >>> applicability of this draft, other than it can be done. >>> >> GIM>> The motivation can be seen in the following (from another draft >> that discusses OAM over G-ACh: >> In some >> environments, the overhead of extra IP/UDP encapsulations may be >> considered as overburden and make using more compact G-ACh >> encapsulation attractive. >> Will add text in the draft. >> >> >> CMP: Thank you very much. This is a good start, although it would be >> useful to add precision into which environments specifically, and the >> burden comparison between IP/UDP and G-ACh. >> > GIM2>> Thank you for agreeing to this, and I've added the text in the > working verion. Will work on improving the text in the meantime. > > > CMP: Sorry if I was not clear. Like I said, this is a good start and > probably necessary (but not sufficient) text. > > CMP: Which environments specifically? At this point, the scope and target > of the work is not clear to me. That was my question. Is this for MPLS-TP > P2MP? If so, the underlying seems to have stalled: > https://datatracker.ietf.org/doc/rfc7167/referencedby/ > CMP: I think these two questions should be answered: 1. What specific > environments? 2. How current solutions do not solve it (i.e., what is and > can we quantify the overburden)? > GIM3>> Andy Malis has pointed to the requirements for proactive OAM, particularly monitoring path continuity, listed in Section 4.1 RFC 4687. These are not specific to MPLS-TP but to OAM over p2mp MPLS LSP. The following text has been added to the Security Considerations section in the recenly uploaded -04 version of the draft: Also, BFD for p2mp MPLS LSP MUST follow the requirements listed in section 4.1 [RFC4687] to avoid congestion in the control plane or the data plane caused by the rate of generating BFD control packets. An operator SHOULD consider the amount of extra traffic generated by p2mp BFD when selecting the interval at which the MultipointHead will transmit BFD control packets. Also, the operator MAY consider the size of the packet the MultipointHead transmits periodically as using IP/UDP encapsulation adds up to 28 octets, which is more than 50% of BFD control packet length, comparing to G-ACh encapsulation. > > >> >>> I=E2=80=99m also increasingly concerned by confusing scope and definiti= on of >>> specifications. >>> >>> For example: >>> >>> https://tools.ietf.org/html/draft-mirsky-mpls-p2mp-bfd-04#section-3.2 >>> >>> 3.2. Non-IP Encapsulation of Multipoint BFD >>> >>> Non-IP encapsulation for multipoint BFD over p2mp MPLS LSP MUST use >>> Generic Associated Channel (G-ACh) Label (GAL) [RFC5586] at the >>> bottom of the label stack followed by Associated Channel Header >>> (ACH). Channel Type field in ACH MUST be set to BFD CV [RFC6428]. >>> >>> >>> First, there=E2=80=99s no definition for non-IP BFD in RFC 5586 =E2=80= =94 only in RFC >>> 5885. >>> >> GIM>> RFC 5586 defined the use of GAL. I think that this reference is >> appropriate. I agree that the second reference should be to RFC 5885, no= t >> RFC 6428. Will make the change. >> >> >> CMP: Thank you. However, RFC 5885 is in the context of PW VCCV =E2=80=94= is there >> a missing definition in the specs for BFD over G-ACh generically? >> > GIM2>> I think that the following quote from RFC 5586 set the relationshi= p > between Channel Type field in PW ACH and G-ACh: > Channel Types for the Associated Channel Header are allocated from > the IANA "PW Associated Channel Type" registry [RFC4446]. > I understand that that there's one and only one registry and channel > values are equally applicable to PW ACH and G-ACh. And full name of the > registry now is MPLS Generalized Associated Channel (G-ACh) Types > (including Pseudowire Associated Channel Types). > > > CMP: That is correct. I was curious as to whether additional control plan= e > is needed for this support. > > >> Second, the specification in RFC 6428 applies to MPLS Transport Profile >>> only. NOT for MPLS, and explicitly NOT for P2MP! >>> >>> https://tools.ietf.org/html/rfc6428#section-1 >>> >>> This document specifies the BFD extension and behavior to satisfy th= e >>> CC, proactive CV monitoring, and the RDI functional requirements for >>> both co-routed and associated bidirectional LSPs. Supported >>> encapsulations include Generic Associated Channel Label (GAL) / >>> Generic Associated Channel (G-ACh), Virtual Circuit Connectivity >>> Verification (VCCV), and UDP/IP. Procedures for unidirectional >>> point-to-point (P2P) and point-to-multipoint (P2MP) LSPs are for >>> further study. >>> >>> >>> So, no, this does not work. >>> >>> RFC 6428 does not have scope for P2MP. >>> And RFC 5586 does not specify anything for BFD. Instead, what needs to >>> be cited (appropriately and expanded) is RFC 5885 >>> >> GIM>> RFC 5586 specifies the use of GAL and G-ACh and the reference is >> used in this context. >> >> >> CMP: This is the same comment as above. >> >> >>> https://tools.ietf.org/html/rfc6428#section-4 >>> RFC 5884 - BFD CC in UDP/IP/LSP >>> RFC 5885 - BFD CC in G-ACh >>> >> GIM>> I'd point that it is for p2p BFD CC, and p2mp BFD uses different >> from p2p BFD method to demultiplex BFD control packets. >> >> >> >> CMP: Apologies I did not understand this response. >> > GIM2>> Apologies for sending partial explanation. P2MP BFD cannot use You= r > Discriminator field to demultiplex the recieved BFD control packet. BFD f= or > Multipoint Networks defines the special procedure that requires the use o= f > Source ID. When the encapsulation of BFD control packet does not include > IP/UDP header, the Source ID can be provided as Source MEP-ID TLV in > MPLS-TP BFD CV. This draft proposes the new IP Address TLV for that. Thus= I > have to correct myself and re-state the earlier text in the draft that th= e > value in the Channel Type filed of G-ACh must be MPLS-TP CV (0x0023). > > > CMP: I understood you said above that the reference to RFC6428 was > incorrect. > > CMP: Now, just to understand the approach: > > CMP: Are you suggesting that the IP header is not used with BFD and > instead a new TLV (of which information structure?) carries the IP addres= s > that you removed before? Seems like a musical-chairs arrangement of the > data. I may very likely be missing something. Apologies in advance if tha= t > is the case. > > CMP: Also, is the applicability MPLS-TP? What is the normative reference > for MPLS-TP P2MP? > GIM3>> I should have explained why I think that MPLS-TP CV message (0x0023) type is more suitable than BFD Control, PW-ACH encapsulation (without IP/UDP Headers) (0x0007). The latter includes only the BFD control packet while the format of the former includes Source MEP-ID TLV that immediately follows the BFD control packet. And with the new proposed IP Address TLV the 0x0023 G-ACh channel works better for p2mp BFD over p2mp MPLS LSP. Alternative, of course, would be to define the new G-ACh type for p2mp BFD over p2mp MPLS LSP. > > Thanks, > > Carlos. > > >> CMP: Thanks again for considering the comment to improve the document. >> >> Thanks, >> >> Carlos. >> >> >> RFC 5085 - UDP/IP in G-ACh >>> MPLS-TP - CC/CV in GAL/G-ACh or G-ACh >>> >>> >>> >>> Thanks, >>> >>> =E2=80=94 Carlos Pignataro >>> >>> On Oct 13, 2018, at 4:24 PM, Greg Mirsky wrote: >>> >>> Dear WG Chairs, et al., >>> as the author of the BFD for Multipoint Networks over >>> Point-to-Multi-Point MPLS LSP (draft-mirsky-mpls-p2mp-bfd) I would like= to >>> ask you to consider WG adoption call of the draft. The document address= es >>> non-IP encapsulation of p2mp BFD over MPLS LSP that may be useful if th= e >>> overhead of IP, particularly IPv6, encapsulation is the concern. The ba= se >>> specification of BFD for Multipoint Networks is at this time in IESG LC= . >>> >>> Regards, >>> Greg >>> _______________________________________________ >>> mpls mailing list >>> mpls@ietf.org >>> https://www.ietf.org/mailman/listinfo/mpls >>> >>> >> > --000000000000548c5a057b1fc5d3 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Carlos,
apologies for the prolonged silence. Thank you for= your consideration of the proposed new text and the acknowledgment that we= 're converging. Please find the new comments in-line tagged GIM3>&g= t;.

Regards,
Greg

On Wed, Nov 7, 2018 at 8:52 PM Carlos Pignat= aro (cpignata) <cpignata@cisco.com= > wrote:
[Greg, Loa, responding to both on this single email reply]

Hi, Loa,

On Nov 6, 2018, at 1:49 PM, Loa Andersson <loa@pi.nu> wrote:

Carlos,

Since the a wg adoption poll I read your comments as that we are doing
progress, and that we can address the rest during the wg process,
correct?


I agree we are making progress, thank you. Most questions can be addre= ssed later, but only the very first question goes to the heart of an adopti= on poll. If we can close on that, the rest can be addressed later (note the= same question is related also to the last question.)

/Loa

Hi, Greg,

Thank you very much for your responses =E2=80=94 please see inline.

On Nov 6, 2018, at 7:18 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:

Hi Carlos,
thank you for your consideration of my responses. Glad that we're = converging. Please find additional notes in-line tagged GIM2>>.

Regards,
Greg

On Tue, Nov 6, 2018 at 12:11 AM Carlos Pignataro (cpignata= ) <cpignata@cisc= o.com> wrote:
Hi Greg,

Many thanks for your response and suggestions! Please see inline.

On Nov 2, 2018, at 6:13 AM, Greg Mirsky <gregimirsky@gmail.com> wrote:

Hi Carlos,
thank you for your comments. Please find my notes, answers in-line tag= ged GIM>>.

Regards,
Greg

On Thu, Oct 25, 2018 at 8:47 PM Carlos Pignataro (cpignata= ) <cpignata@cisc= o.com> wrote:
Hi,

Cc BFD WG

It would be useful to understand the use case motivation or applicabil= ity of this draft, other than it can be done.
GIM>>=C2=A0 The motivation can be seen in the following (from an= other draft that discusses OAM over G-ACh:
=C2=A0 In some
=C2=A0 =C2=A0environments, the overhead of extra IP/UDP encapsulations= may be
=C2=A0 =C2=A0considered as overburden and make using more compact G-AC= h
=C2=A0 =C2=A0encapsulation attractive.
Will add text in the draft.

CMP: Thank you very much. This is a good start, although it would be u= seful to add precision into which environments specifically, and the burden= comparison between IP/UDP and G-ACh.
GIM2>> Thank you for agreeing to this, and I've added the te= xt in the working verion. Will work on improving the text in the meantime.<= /div>

CMP: Sorry if I was not clear. Like I said, this is a good start and p= robably necessary (but not sufficient) text.

CMP: Which environments specifically? At this point, the scope and tar= get of the work is not clear to me. That was my question. Is this for MPLS-= TP P2MP? If so, the underlying seems to have stalled:=C2=A0
https://datatracker.ietf.org/doc/rfc7167/referencedby/
CMP: I think these two questions should be answered: 1. What specific = environments? 2. How current solutions do not solve it (i.e., what is and c= an we quantify the overburden)?
GI= M3>> Andy Malis has pointed to the requirements for proactive OAM, pa= rticularly monitoring path continuity, listed in Section 4.1 RFC 4687. Thes= e are not specific to MPLS-TP but to OAM over p2mp MPLS LSP. The following = text has been added to the Security Considerations section in the recenly u= ploaded -04 version of the draft:
=C2=A0 =C2=A0Also, BFD for= p2mp MPLS LSP MUST follow the requirements listed in
=C2=A0 =C2= =A0section 4.1 [RFC4687] to avoid congestion in the control plane or the
=C2=A0 =C2=A0data plane caused by the rate of generating BFD contro= l packets.=C2=A0 An
=C2=A0 =C2=A0operator SHOULD consider the amo= unt of extra traffic generated by
=C2=A0 =C2=A0p2mp BFD when sele= cting the interval at which the MultipointHead will
=C2=A0 =C2=A0= transmit BFD control packets.=C2=A0 Also, the operator MAY consider the
=C2=A0 =C2=A0size of the packet the MultipointHead transmits periodi= cally as using
=C2=A0 =C2=A0IP/UDP encapsulation adds up to 28 oc= tets, which is more than 50% of
=C2=A0 =C2=A0BFD control packet l= ength, comparing to G-ACh encapsulation.
<= div>


I=E2=80=99m also increasingly concerned by confusing scope and definit= ion of specifications.

For example:


3.2.=C2=A0 Non-IP Encapsulation of Multipoint BFD

=C2=A0 =C2=A0Non-IP encapsulation for multipoint BFD over p2mp MPLS LS= P MUST use
=C2=A0 =C2=A0Generic Associated Channel (G-ACh) Label (GAL) [RFC5586] = at the
=C2=A0 =C2=A0bottom of the label stack followed by Associated Channel = Header
=C2=A0 =C2=A0(ACH).=C2=A0 Channel Type field in ACH MUST be set to BFD= CV [RFC6428].


First, there=E2=80=99s no definition for non-IP BFD in RFC 5586 =E2=80= =94 only in RFC 5885.
GIM>> RFC 5586 defined the use of GAL. I think that this referen= ce is appropriate. I agree that the second reference should be to RFC 5885,= not RFC 6428. Will make the change.

CMP: Thank you. However, RFC 5885 is in the context of PW VCCV =E2=80= =94 is there a missing definition in the specs for BFD over G-ACh generical= ly?
GIM2>> I think that the following quote from RFC 5586 set the re= lationship between Channel Type field in PW ACH and G-ACh:
=C2=A0 =C2=A0 Channel Types for the Associated Channel Header are allo= cated from
=C2=A0 =C2=A0 the IANA "PW Associated Channel Type" registry= [RFC4446].=C2=A0
I understand that that there's one and only one registry and chann= el values are equally applicable to PW ACH and G-ACh. And full name of the = registry now is=C2=A0MPLS Generalized Associated Channel (G-ACh) Types (inc= luding Pseudowire Associated Channel Types).

CMP: That is correct. I was curious as to whether additional control p= lane is needed for this support.


Second, the specification in RFC 6428 applies to=C2=A0MPLS Transport P= rofile only. NOT for MPLS, and explicitly NOT for P2MP!


=C2=A0 =C2=A0This document specifies the BFD extension and behavior to= satisfy the
=C2=A0 =C2=A0CC, proactive CV monitoring, and the RDI functional requi= rements for
=C2=A0 =C2=A0both co-routed and associated bidirectional LSPs.=C2=A0 S= upported
=C2=A0 =C2=A0encapsulations include Generic Associated Channel Label (= GAL) /
=C2=A0 =C2=A0Generic Associated Channel (G-ACh), Virtual Circuit Conne= ctivity
=C2=A0 =C2=A0Verification (VCCV), and UDP/IP.=C2=A0 Procedures for uni= directional
=C2=A0 =C2=A0point-to-point (P2P) and point-to-multipoint (P2MP) LSPs = are for
=C2=A0 =C2=A0further study.


So, no, this does not work.

RFC 6428 does not have scope for P2MP.
And RFC 5586 does not specify anything for BFD. Instead, what needs to= be cited (appropriately and expanded) is RFC 5885
GIM>> RFC 5586 specifies the use of GAL and G-ACh and the refere= nce is used in this context.

CMP: This is the same comment as above.


=C2=A0 =C2=A0 =C2=A0=C2=A0RFC 5884 - BFD CC in UDP/IP/LSP
=C2=A0 =C2=A0 =C2=A0 RFC 5885 - BFD CC in G-ACh=C2=A0
GIM>> I'd point that it is for p2p BFD CC, and p2mp BFD uses= different from p2p BFD method to demultiplex BFD control packets.=C2=A0


CMP: Apologies I did not understand this response.
GIM2>> Apologies for sending partial explanation. P2MP BFD canno= t use Your Discriminator field to demultiplex the recieved BFD control pack= et. BFD for Multipoint Networks defines the special procedure that requires= the use of Source ID. When the encapsulation of BFD control packet does not include IP/UDP header, the So= urce ID can be provided as Source MEP-ID TLV in MPLS-TP BFD CV. This draft = proposes the new IP Address TLV for that. Thus I have to correct myself and= re-state the earlier text in the draft that the value in the Channel Type filed of G-ACh must be MPLS-TP CV= (0x0023).

CMP: I understood you said above that the reference to RFC6428 was inc= orrect.=C2=A0

CMP: Now, just to understand the approach:=C2=A0

CMP: Are you suggesting that the IP header is not used with BFD and in= stead a new TLV (of which information structure?) carries the IP address th= at you removed before? Seems like a musical-chairs arrangement of the data.= I may very likely be missing something. Apologies in advance if that is the case.

CMP: Also, is the applicability MPLS-TP? What is the normative referen= ce for MPLS-TP P2MP?
GIM3>> = I should have explained why I think that MPLS-TP CV message (0x0023) type i= s more suitable than BFD Control, PW-ACH encapsulation (without IP/UDP Head= ers) (0x0007). The latter includes only the BFD control packet while the fo= rmat of the former includes Source MEP-ID TLV that immediately follows the = BFD control packet. And with the new proposed IP Address TLV the 0x0023 G-A= Ch channel works better for p2mp BFD over p2mp MPLS LSP. Alternative, of co= urse, would be to define the new G-ACh type for p2mp BFD over p2mp MPLS LSP= .

Thanks,

Carlos.


CMP: Thanks again for considering the comment to improve the document.=

Thanks,

Carlos.


=C2=A0 =C2=A0 =C2=A0 RFC 5085 - UDP/IP in G-ACh
=C2=A0 =C2=A0 =C2=A0 =C2=A0MPLS-TP - CC/CV in GAL/G-ACh or G-ACh



Thanks,

=E2=80=94 Carlos Pignataro

On Oct 13, 2018, at 4:24 PM, Greg Mirsky <gregimirsky@gmail.com> wrote:
Dear WG Chairs, et al.,
as the author of the BFD for Multipoint Networks over Point-to-Multi-P= oint MPLS LSP (draft-mirsky-mpls-p2mp-bfd) I would like to ask you to consi= der WG adoption call of the draft. The document addresses non-IP encapsulat= ion of p2mp BFD over MPLS LSP that may be useful if the overhead of IP, particularly IPv6, encapsula= tion is the concern. The base specification of BFD for Multipoint Networks = is at this time in IESG LC.

Regards,
Greg
_______________________________________________
mpls mailing list
mpls@ietf.org
ht= tps://www.ietf.org/mailman/listinfo/mpls


--000000000000548c5a057b1fc5d3-- From nobody Wed Nov 21 14:13:20 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 27BB712D7F8 for ; Wed, 21 Nov 2018 14:13:18 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, 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 GyIzIw9Rnhte for ; Wed, 21 Nov 2018 14:13:16 -0800 (PST) Received: from slice.pfrc.org (slice.pfrc.org [67.207.130.108]) by ietfa.amsl.com (Postfix) with ESMTP id B3B7A12D4E9 for ; Wed, 21 Nov 2018 14:13:16 -0800 (PST) Received: by slice.pfrc.org (Postfix, from userid 1001) id D834A1E4FB; Wed, 21 Nov 2018 17:12:31 -0500 (EST) Date: Wed, 21 Nov 2018 17:12:31 -0500 From: Jeffrey Haas To: "Reshad Rahman (rrahman)" Cc: "rtg-bfd@ietf.org" , "draft-ietf-bfd-large-packets@ietf.org" Subject: Re: BFD WG adoption for draft-haas-bfd-large-packets Message-ID: <20181121221231.GA23096@pfrc.org> References: <295F72CA-5F0A-44B1-BA3C-AB6E07B4E99A@cisco.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <295F72CA-5F0A-44B1-BA3C-AB6E07B4E99A@cisco.com> User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Nov 2018 22:13:18 -0000 Reshad, On Sat, Nov 17, 2018 at 01:58:25PM +0000, Reshad Rahman (rrahman) wrote: > Hi authors., > > This document has passed adoption as a BFD WG document. > > Please resubmit the doc as draft-ietf-bfd-large-packets. Please also note that while there was strong support for adopting the document, the following points/questions were raised and should be discussed further within the WG as the document progresses: > > 1. Is there necessity to send all packets as large packets or alternatively can that be done periodically? > 2. Authors should consider adding some text wrt use of BFD echo in the document The intent is to do the draft-ietf-bfd republish next week and include text to address these. > Also, there was a suggestion made to use BFD for PMTUD (as opposed to the BFD session failing when expected MTU isn’t met). My take on this is that it falls out of our charter but the PMTUD use-case should be considered if/when we recharter, I’d like to hear your thoughts on this. We believe that this is currently out of scope for the work. However, as I have discussed with Albert, it's not unusual for BFD features to be used in unexpected ways. If there continues to be interest in discussing this, it might be worth adding an appendix covering this use case. -- Jeff (speaking as an individual contributor) From nobody Wed Nov 21 14:16:33 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 477B0128D0C; Wed, 21 Nov 2018 14:16:31 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, 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 ZetZgwTbZbqQ; Wed, 21 Nov 2018 14:16:30 -0800 (PST) Received: from slice.pfrc.org (slice.pfrc.org [67.207.130.108]) by ietfa.amsl.com (Postfix) with ESMTP id 0279812D4E9; Wed, 21 Nov 2018 14:16:29 -0800 (PST) Received: by slice.pfrc.org (Postfix, from userid 1001) id F0BB61E4FB; Wed, 21 Nov 2018 17:15:45 -0500 (EST) Date: Wed, 21 Nov 2018 17:15:45 -0500 From: Jeffrey Haas To: rtg-bfd@ietf.org Cc: draft-chen-bfd-unsolicited@ietf.org Subject: Re: WG Adoption for draft-chen-bfd-unsolicted Message-ID: <20181121221545.GB23096@pfrc.org> References: <20181029155232.GN12336@pfrc.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181029155232.GN12336@pfrc.org> User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Nov 2018 22:16:31 -0000 Working Group, After discussing this with Reshad, the consensus is we have enough interest to proceed in working group adoption. Authors, please re-submit your draft as draft-ietf-bfd-unsolicited. -- Jeff On Mon, Oct 29, 2018 at 11:52:32AM -0400, Jeffrey Haas wrote: > Working Group, > > Reviewing my notes, I was remiss in sending out an adoption request for > draft-chen-bfd-unsolicted (Unsolicited BFD for Sessionless Applications). > > https://datatracker.ietf.org/doc/draft-chen-bfd-unsolicited/ > > This relatively minor change from the RFC 5880 spec is implemented by at > least one vendor for static route configuration. Its security > considerations already cover what I believe to be the main concern with the > procedural change. > > There's a minor point to resolve regarding the document's status - currently > Informational - with our AD. > > Please indicate whether you'd support adopting this draft as a Working Group > document. > > Authors, please indicate if you're aware of any applicable IPR on it. > > This adoption request will also end on Friday, November 9, IETF 103 Friday. > > -- Jeff & Reshad From nobody Wed Nov 21 14:28:42 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C5A7A12F295 for ; Wed, 21 Nov 2018 14:28:40 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, 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 d2JBDsLikMqz for ; Wed, 21 Nov 2018 14:28:39 -0800 (PST) Received: from slice.pfrc.org (slice.pfrc.org [67.207.130.108]) by ietfa.amsl.com (Postfix) with ESMTP id 85F19128D0C for ; Wed, 21 Nov 2018 14:28:39 -0800 (PST) Received: by slice.pfrc.org (Postfix, from userid 1001) id 743971E4FB; Wed, 21 Nov 2018 17:27:55 -0500 (EST) Date: Wed, 21 Nov 2018 17:27:55 -0500 From: Jeffrey Haas To: rtg-bfd@ietf.org Subject: Re: WG Adoption request for draft-mirsky-bfd-mpls-demand Message-ID: <20181121222755.GC23096@pfrc.org> References: <20181017222431.GK17157@pfrc.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181017222431.GK17157@pfrc.org> User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Nov 2018 22:28:41 -0000 Working Group, After discussion among the chairs, we have decided to not adopt draft-mirsky-bfd-mpls-demand at this time. Since the list response to the adoption were positive, it is necessary to explain some of the reasoning for this choice. The chairs had private exchanges with individuals that did not wish to publicly comment on their reasons for not supporting adoption. We have chosen to consider their comments and accept their reasoning for declining to publicly comment. Additionally, on more thorough review of the proposal by the chairs, it's our opinion that the core procedures for BFD demand mode are not necessarily in need of amending in this instance to warrant a new working group task. Errata would be considered for minor issues, if necessary. -- Jeff On Wed, Oct 17, 2018 at 06:24:31PM -0400, Jeffrey Haas wrote: > Working Group, > > The BFD chairs have received an adoption request for > "BFD in Demand Mode over Point-to-Point MPLS LSP" > (draft-mirsky-bfd-mpls-demand). > > https://datatracker.ietf.org/doc/draft-mirsky-bfd-mpls-demand/ > > The adoption call will end on the Friday after IETF 103, November 9. > > Note that there is are existing IPR statements on this draft: > https://datatracker.ietf.org/ipr/3301/ > https://datatracker.ietf.org/ipr/3104/ > > Please indicate to the mailing list whether you support adoption of this > draft. > > -- Jeff & Reshad From nobody Wed Nov 21 14:41:08 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 89992130934 for ; Wed, 21 Nov 2018 14:41:06 -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 kalZCnzZ63EC for ; Wed, 21 Nov 2018 14:41:04 -0800 (PST) Received: from mail-lf1-x135.google.com (mail-lf1-x135.google.com [IPv6:2a00:1450:4864:20::135]) (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 5C446128D0C for ; Wed, 21 Nov 2018 14:41:04 -0800 (PST) Received: by mail-lf1-x135.google.com with SMTP id n18so5166855lfh.6 for ; Wed, 21 Nov 2018 14:41:04 -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=N0t2PkwzMRqkeUIheiq5ntwUmtHJfrG689PyHNnNJpI=; b=QjfgDkGm9mybBISfQJdKgUn2u96bq8pVc0XLEE/Wvkqu8DpZ6qEdpHAnzwldfM3d7X KpoWuN4pgG5ZmiIkYjBDVYhAw/+QQFGXmCa3OqYE6s1Ik6JXenC9pCJ5bQGt1UX+qqmm s7DFla+4Yn8Ni5SEDi8xhFu2Q7q56snHs8Ms0lNDoD8aD/i+TKJtAJuST3epM2GYG2Uq g7eAa+xrpq8b+DdSlCS6pQ+GvIfRtgV2rkJN7Evtp4XQae64Q9eo+sAYWW2xkaqlu5w8 F9YnJNAz1YuEapcB2PXKtPdrVmP/WoRN/t2cBIAFY8io9VsJdhFMnctLFnHLTFMxDLgw 2ACg== 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=N0t2PkwzMRqkeUIheiq5ntwUmtHJfrG689PyHNnNJpI=; b=WMJnMqKexcpd4gKp/gE4ngf7MUekGlejyDmrMCRMCE5/jWC1CmxCVicRj4SRD8E6t0 OAw+u3wnSYscmt4sAiWdwplPYFUHTGkNmwDQJ8OMdvCheEVcNtD3AMAXW1dcYwLHu34x v9Scsqnx1Cgqy1XIQnNbTkL5NBFPM/fvX90wNTgcLd9RRi8CCsE4BVSbGx2g6v+FdUml zpbyqYok6AMHfZGHy55+mjrC4DNCpPBtaT0a3gS4UvbfWoR9lGvjLYuDhQfUaQnPifMY VhjpLP5pWC4bLYj7aPZxulInBqIgpjvz6nQwi/n4BwV757UA3GZuSXR8+jMdipssJSZ3 8v0Q== X-Gm-Message-State: AGRZ1gIdJWTtmSMfDtlimVqVilIFILuq9QYY2LVKNNusGHGjqj3v6C23 BuUERuVXY/4SjpX+y56R8AQdGEfPJB8rTcsgz+c= X-Google-Smtp-Source: AJdET5d/vEAhrnwnssxQ6TYf7HoBJdD0kesgFGNK73YGSvqOJT1ao8sqqi96uTCU0uf3w3MWSZWMGEGn8eEu/oyp/yQ= X-Received: by 2002:a19:6f0a:: with SMTP id k10mr4773658lfc.119.1542840062403; Wed, 21 Nov 2018 14:41:02 -0800 (PST) MIME-Version: 1.0 References: <20181017222431.GK17157@pfrc.org> <20181121222755.GC23096@pfrc.org> In-Reply-To: <20181121222755.GC23096@pfrc.org> From: Greg Mirsky Date: Wed, 21 Nov 2018 14:40:50 -0800 Message-ID: Subject: Re: WG Adoption request for draft-mirsky-bfd-mpls-demand To: Jeffrey Haas Cc: rtg-bfd WG Content-Type: multipart/alternative; boundary="000000000000dd6b6d057b34714b" Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Nov 2018 22:41:07 -0000 --000000000000dd6b6d057b34714b Content-Type: text/plain; charset="UTF-8" Dear WG Chairs, I respectfully ask to summarize the comments that were shared with you and to publish them to the WG without naming the authors. And I have to admit that I don't understand your suggestion to use the Errata. The procedures to apply the Demand mode described in the draft are not in contradiction with RFC 5880, so the suggestion to use Errata surprised me. Regards, Greg On Wed, Nov 21, 2018 at 2:28 PM Jeffrey Haas wrote: > Working Group, > > After discussion among the chairs, we have decided to not adopt > draft-mirsky-bfd-mpls-demand at this time. Since the list response to the > adoption were positive, it is necessary to explain some of the reasoning > for > this choice. > > The chairs had private exchanges with individuals that did not wish to > publicly comment on their reasons for not supporting adoption. We have > chosen to consider their comments and accept their reasoning for declining > to publicly comment. > > Additionally, on more thorough review of the proposal by the chairs, it's > our opinion that the core procedures for BFD demand mode are not > necessarily in need of amending in this instance to warrant a new working > group task. Errata would be considered for minor issues, if necessary. > > -- Jeff > > > On Wed, Oct 17, 2018 at 06:24:31PM -0400, Jeffrey Haas wrote: > > Working Group, > > > > The BFD chairs have received an adoption request for > > "BFD in Demand Mode over Point-to-Point MPLS LSP" > > (draft-mirsky-bfd-mpls-demand). > > > > https://datatracker.ietf.org/doc/draft-mirsky-bfd-mpls-demand/ > > > > The adoption call will end on the Friday after IETF 103, November 9. > > > > Note that there is are existing IPR statements on this draft: > > https://datatracker.ietf.org/ipr/3301/ > > https://datatracker.ietf.org/ipr/3104/ > > > > Please indicate to the mailing list whether you support adoption of this > > draft. > > > > -- Jeff & Reshad > > --000000000000dd6b6d057b34714b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Dear WG Chairs,
I respectfully ask to summarize the co= mments that were shared with you and to=C2=A0publish them to the WG without= naming the authors.

And I have to admit that I do= n't understand your suggestion to use the Errata. The procedures to app= ly the Demand mode described in the draft are not in contradiction with RFC= 5880, so the suggestion to use Errata surprised me.

Regards,
Greg

On Wed, Nov 21, 2018 at 2:28 PM Jeffrey Haas <jhaas@pfrc.org> wrote:
Working Group,

After discussion among the chairs, we have decided to not adopt
draft-mirsky-bfd-mpls-demand at this time.=C2=A0 Since the list response to= the
adoption were positive, it is necessary to explain some of the reasoning fo= r
this choice.

The chairs had private exchanges with individuals that did not wish to
publicly comment on their reasons for not supporting adoption.=C2=A0 We hav= e
chosen to consider their comments and accept their reasoning for declining<= br> to publicly comment.

Additionally, on more thorough review of the proposal by the chairs, it'= ;s
our opinion that the core procedures for BFD demand mode are not
necessarily in need of amending in this instance to warrant a new working group task.=C2=A0 Errata would be considered for minor issues, if necessary= .

-- Jeff


On Wed, Oct 17, 2018 at 06:24:31PM -0400, Jeffrey Haas wrote:
> Working Group,
>
> The BFD chairs have received an adoption request for
> "BFD in Demand Mode over Point-to-Point MPLS LSP"
> (draft-mirsky-bfd-mpls-demand).
>
> https://datatracker.ietf.org/doc/= draft-mirsky-bfd-mpls-demand/
>
> The adoption call will end on the Friday after IETF 103, November 9. >
> Note that there is are existing IPR statements on this draft:
> https://datatracker.ietf.org/ipr/3301/
> https://datatracker.ietf.org/ipr/3104/
>
> Please indicate to the mailing list whether you support adoption of th= is
> draft.
>
> -- Jeff & Reshad

--000000000000dd6b6d057b34714b-- From nobody Wed Nov 21 15:25:25 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F1095130DF3; Wed, 21 Nov 2018 15:25:21 -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 lSOzonX73pUM; Wed, 21 Nov 2018 15:25:19 -0800 (PST) Received: from mail-lj1-x22c.google.com (mail-lj1-x22c.google.com [IPv6:2a00:1450:4864:20::22c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 30357130DD6; Wed, 21 Nov 2018 15:25:19 -0800 (PST) Received: by mail-lj1-x22c.google.com with SMTP id u6-v6so6333417ljd.1; Wed, 21 Nov 2018 15:25:19 -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; bh=hzvLp6MSatz7vcpWX1shI4zzb+l+kkXlVRMVq6bW4Dw=; b=kJiymjpx0LbydLV3pxJnghIa3UfzzhFaXpbP0QkuTAkuZCVJPtKtKI2DIumC4BVBmW FQJ5RebALdtRqaSOqMP8sx74bA4XtF6CMxkNpZcfRmWCg9clMFbgi+LClsGyu8x5/ZV/ bubkox62KMQK+Y97rtI35qiv6ctvoRXi/XBD36eRuHYeD5ufkO/doeBXNG4VQvdF6sVj CY8ANCEgMDam8kZ+zENE9VdBpBwcLLC48nYYE0JYFM01hZhSj9bdaSgTkfVWBiL/RwTr uFIAMNfkUvdmMsLWK3rVxKRkerc8jq1UQSjXCj4O6U+XN5WQUa1z6vBM10E+e38YaRaF /Xvg== 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; bh=hzvLp6MSatz7vcpWX1shI4zzb+l+kkXlVRMVq6bW4Dw=; b=rLG3p/5dWDUGxQuu5oOzW5/y6vstRZ6zHryD8GweIIoMyXCw6Z3QB/x37RNDU4Y47b M7dv9moZ9wi/fmfz67hfiMjRQbDeTBv1uPLUwEarptGcE1jboYS0CdrDnDdKP2a+0c0n pY654dbAKifKefXRV4523jVHMZAZ+Ush7ffjBhLiKa6q4s/57DO8Qhlk5R04071JoW3c tdcK9iJhc9W3yZkG+eUowfP+9v3sbNOXP4EpRjjufT0OE38v7u5AgeyPE5W2x9dcbCyD QcUf6w3J71SHB6RR3invRZc84j3s0hQ0MHv/cXXO1NqjSZiDcVSFFOsoSiVNu/jBuy0z Nvug== X-Gm-Message-State: AA+aEWZ/GcB745OjS8ujhwOtUfapVwVVzEvtG1ocAHPX05erlQg3fFrx zZ0f14ZbsVcDwzngmyzjMX6Ix8G4ryKOg61tu2iQzQ== X-Google-Smtp-Source: AFSGD/UQDxURJkO/oR5iv5L5gbtH7E61gWRRaEmg6QA+A5eHEM0C4yndZh63My6QRBCy/0ixkKJKswM+jcwHgLnro6g= X-Received: by 2002:a2e:851a:: with SMTP id j26-v6mr5203011lji.163.1542842716889; Wed, 21 Nov 2018 15:25:16 -0800 (PST) MIME-Version: 1.0 References: <154139002554.31837.10221034648542755197@ietfa.amsl.com> In-Reply-To: <154139002554.31837.10221034648542755197@ietfa.amsl.com> From: Greg Mirsky Date: Wed, 21 Nov 2018 15:25:04 -0800 Message-ID: Subject: Fwd: IPR Disclosure Ciena Corporation's Statement about IPR related to draft-ietf-bfd-optimizing-authentication To: rtg-bfd WG , bfd-chairs@ietf.org Content-Type: multipart/alternative; boundary="00000000000015a55c057b3510ab" Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Nov 2018 23:25:22 -0000 --00000000000015a55c057b3510ab Content-Type: text/plain; charset="UTF-8" Dear All, in light of the IPR Disclosure, I am concerned by its timing (3+ years after the introduction of the document doesn't seem in line with RFC 8179) and the FRAND licensing for an implementation. Because of the FRAND clause, I oppose the progress of the draft further. Regards, Greg ---------- Forwarded message --------- From: IETF Secretariat Date: Mon, Nov 5, 2018 at 10:53 AM Subject: IPR Disclosure Ciena Corporation's Statement about IPR related to draft-ietf-bfd-optimizing-authentication To: Cc: , Dear Mahesh Jethanandani, Ashesh Mishra, Ankur Saxena, Manav Bhatia: An IPR disclosure that pertains to your Internet-Draft entitled "Optimizing BFD Authentication" (draft-ietf-bfd-optimizing-authentication) 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/3328/). The title of the IPR disclosure is "Ciena Corporation's Statement about IPR related to draft-ietf-bfd-optimizing-authentication" Thank you IETF Secretariat --00000000000015a55c057b3510ab Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Dear All,
in light of the IPR Disclos= ure, I am concerned by its timing (3+ years after the introduction of the d= ocument doesn't seem in line with RFC 8179) and the FRAND licensing for= an implementation. Because of the FRAND clause, I oppose the progress of t= he draft further.

Regards,
Greg

<= div class=3D"gmail_quote">
---------- Forwarded message ---= ------
From: IETF Secret= ariat <ietf-ipr@ietf.org>
Date: Mon, Nov 5, 2018= at 10:53 AM
Subject: IPR Disclosure Ciena Corporation's Statement a= bout IPR related to draft-ietf-bfd-optimizing-authentication
To: <draft-ietf-bfd-optimizing-authentication@ietf.org>
Cc= : <rtg-bfd@ietf.o= rg>, <ipr-announce@ietf.org>


Dear Mahesh Jethanandani, A= shesh Mishra, Ankur Saxena, Manav Bhatia:


An IPR disclosure that pertains to your Internet-Draft entitled
"Optimizing BFD Authentication"
(draft-ietf-bfd-optimizing-authentication) was submitted to the IETF
Secretariat on=C2=A0 and has been posted on the "IETF Page of Intellec= tual
Property Rights Disclosures" (https://datatracker.ietf.or= g/ipr/3328/). The
title of the IPR disclosure is "Ciena Corporation's Statement abou= t IPR
related to draft-ietf-bfd-optimizing-authentication"


Thank you

IETF Secretariat

--00000000000015a55c057b3510ab-- From nobody Wed Nov 21 18:42:04 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1179B130E37; Wed, 21 Nov 2018 16:36:36 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.017 X-Spam-Level: X-Spam-Status: No, score=-1.017 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_FONT_FACE_BAD=0.981, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id d0BmwHZtcYVh; Wed, 21 Nov 2018 16:36:33 -0800 (PST) Received: from mail-lf1-x131.google.com (mail-lf1-x131.google.com [IPv6:2a00:1450:4864:20::131]) (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 D83E6130DE5; Wed, 21 Nov 2018 16:36:32 -0800 (PST) Received: by mail-lf1-x131.google.com with SMTP id u18so5296115lff.10; Wed, 21 Nov 2018 16:36:32 -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=0LMGN4CfJ6YBvTgGx6d4/ibnfPZfFj8obaJconUMX+Y=; b=oWqVby43NCHdrNsuFm51AA8Jy8BYRhLKTl4FHuLmIanRuDO8M0UssK/t9ckOkk2jit zl7ee9j3BqHyc/tEWXTuV9pztejYKhw4ArLL8H96hQfZ93EBiBOSLg0ImqxZsqY1QL3x sxIr4mqq0GnSDSQO7JJhmllKqXDrhzU1QzPly+mSt/V9Us11BKU4WjluhyxujFGaFMnV ZCj6CPwzpsGth4FB3mF9pFrwB0hN3pCueTAN3Haj7hGNk0YHHIDtJeXVIyUsGigSYYnM MVQjfrZ/6/7Buk9Ya5adAekD+GWCM3NwdE7fdk+JpmNAf4qN1HdUT9mKByV7Ke6h1PYv P1SQ== 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=0LMGN4CfJ6YBvTgGx6d4/ibnfPZfFj8obaJconUMX+Y=; b=bLjxVMsL9nd7WuxfhtjEIcG/zdd44p05rxl3rE3tB3uwDMExOidEeR7UOS3YHYCTMz s7ChRiWEdvT3ZSljQSTdSWIquy/DDPW+BQRL6MNeTy223FKHddTYvdZTEMMmx6YQcdwQ rBLLxXjT65Z/QycR0N3OirNrCZBZwV1qext1Ve3jAUJqsv2cz2LKbynuiRYsTE/nrjCY LuBFxtCl2ZvNtkObBIviqCSY2CETv+SF7c6/kg80LTj8JxC1hpC++vHw9iMc3S7E0ODz Rtoep1mUeBLW9hQWJZwfgPnyUXIzHOUGI7CrdL30TadHII14g8RODM4QimZxC4kS0poV dQzA== X-Gm-Message-State: AGRZ1gKLtlXelDZlX9mfolPx/FlHKG2gVa/jtfkm43jD7PYxhGVmd4LK QgaSIE2qaMXqt9/3zx3RZ9d9tGH0jyF7Pv4gdFswkieS X-Google-Smtp-Source: AJdET5f0dMqk7GSLZCM/Ukqk6uJLSRl8NMiAkPlt0YRPpXzoS3Fokn75la/aEKTO+0qiBnxfoPB6KGfSgWZlLB6wUr8= X-Received: by 2002:a19:c014:: with SMTP id q20mr4764720lff.16.1542846990748; Wed, 21 Nov 2018 16:36:30 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Greg Mirsky Date: Wed, 21 Nov 2018 16:36:18 -0800 Message-ID: Subject: Re: WGLC comments on draft-ietf-bfd-vxlan To: Anoop Ghanwani Cc: rtg-bfd WG , NVO3 Content-Type: multipart/alternative; boundary="000000000000d3916e057b360ec3" Archived-At: X-Mailman-Approved-At: Wed, 21 Nov 2018 18:42:03 -0800 X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Nov 2018 00:36:36 -0000 --000000000000d3916e057b360ec3 Content-Type: text/plain; charset="UTF-8" Hi Anoop, apologies for the miss. Is it the last outstanding? Let's bring it to the front then. - What is the benefit of running BFD per VNI between a pair of VTEPs? >>>> >>> GIM2>> An alternative would be to run CFM between VMs, if there's the >>> need to monitor liveliness of the particular VM. Again, this is optional. >>> >> >> [ag2] I'm not sure how running per-VNI BFD between the VTEPs allows one >> to monitor the liveliness of VMs. >> > [ag3] I think you missed responding to this. I'm not sure of the value of running BFD per VNI between VTEPs. What am I getting that is not covered by running a single BFD session with VNI 0 between the VTEPs? GIM3>> I've misspoken. Non-zero VNI is recommended to be used to demultiplex BFD sessions between the same VTEPs. In section 6.1: The procedure for demultiplexing packets with Your Discriminator equal to 0 is different from [RFC5880]. For such packets, the BFD session MUST be identified using the inner headers, i.e., the source IP and the destination IP present in the IP header carried by the payload of the VXLAN encapsulated packet. The VNI of the packet SHOULD be used to derive interface-related information for demultiplexing the packet. Hope that clarifies the use of non-zero VNI in VXLAN encapsulation of a BFD control packet. Regards, Greg On Tue, Nov 20, 2018 at 12:14 PM Anoop Ghanwani wrote: > Hi Greg, > > Please see inline prefixed by [ag3]. > > Thanks, > Anoop > > On Fri, Nov 16, 2018 at 5:29 PM Greg Mirsky wrote: > >> Hi Anoop, >> thank you for the discussion. Please find my responses tagged GIM3>>. >> Also, attached diff and the updated working version of the draft. Hope >> we're converging. >> >> Regards, >> Greg >> >> On Wed, Nov 14, 2018 at 11:00 PM Anoop Ghanwani >> wrote: >> >>> Hi Greg, >>> >>> Please see inline prefixed with [ag2]. >>> >>> Thanks, >>> Anoop >>> >>> On Wed, Nov 14, 2018 at 9:45 AM Greg Mirsky >>> wrote: >>> >>>> Hi Anoop, >>>> thank you for the expedient response. I am glad that some of my >>>> responses have addressed your concerns. Please find followup notes in-line >>>> tagged GIM2>>. I've attached the diff to highlight the updates applied in >>>> the working version. Let me know if these are acceptable changes. >>>> >>>> Regards, >>>> Greg >>>> >>>> On Tue, Nov 13, 2018 at 12:30 PM Anoop Ghanwani >>>> wrote: >>>> >>>>> Hi Greg, >>>>> >>>>> Please see inline prefixed with [ag]. >>>>> >>>>> Thanks, >>>>> Anoop >>>>> >>>>> On Tue, Nov 13, 2018 at 11:34 AM Greg Mirsky >>>>> wrote: >>>>> >>>>>> Hi Anoop, >>>>>> many thanks for the thorough review and detailed comments. Please >>>>>> find my answers, this time for real, in-line tagged GIM>>. >>>>>> >>>>>> Regards, >>>>>> Greg >>>>>> >>>>>> On Thu, Nov 8, 2018 at 1:58 AM Anoop Ghanwani >>>>>> wrote: >>>>>> >>>>>>> >>>>>>> Here are my comments. >>>>>>> >>>>>>> Thanks, >>>>>>> Anoop >>>>>>> >>>>>>> == >>>>>>> >>>>>>> Philosophical >>>>>>> >>>>>>> Since VXLAN is not an IETF standard, should we be defining a >>>>>>> standard for running BFD on it? Should we define BFD over Geneve instead >>>>>>> which is the official WG selection? Is that going to be a separate >>>>>>> document? >>>>>>> GIM>> IS-IS is not on the Standard track either but that had not >>>>>>> prevented IETF from developing tens of standard track RFCs using RFC 1142 >>>>>>> as the normative reference until RFC 7142 re-classified it as historical. A >>>>>>> similar path was followed with IS-IS-TE by publishing RFC 3784 until it was >>>>>>> obsoleted by RFC 5305 four years later. I understand that Down Reference, >>>>>>> i.e., using informational RFC as the normative reference, is not an unusual >>>>>>> situation. >>>>>>> >>>>>> >>>>> [ag] OK. I'm not an expert on this part so unless someone else that >>>>> is an expert (chairs, AD?) can comment on it, I'll just let it go. >>>>> >>>>> >>>>>> >>>>>> >>>>>>> >>>>>>> Technical >>>>>>> >>>>>>> Section 1: >>>>>>> >>>>>>> This part needs to be rewritten: >>>>>>> >>> >>>>>>> The individual racks may be part of a different Layer 3 network, or >>>>>>> they could be in a single Layer 2 network. The VXLAN segments/overlays are >>>>>>> overlaid on top of Layer 3 network. A VM can communicate with another VM >>>>>>> only if they are on the same VXLAN segment. >>>>>>> >>> >>>>>>> It's hard to parse and, given IRB, >>>>>>> >>>>>> GIM>> Would the following text be acceptable: >>>>>> OLD TEXT: >>>>>> VXLAN is typically deployed in data centers interconnecting >>>>>> virtualized hosts, which may be spread across multiple racks. The >>>>>> individual racks may be part of a different Layer 3 network, or >>>>>> they >>>>>> could be in a single Layer 2 network. The VXLAN segments/overlays >>>>>> are overlaid on top of Layer 3 network. >>>>>> NEW TEXT: >>>>>> VXLAN is typically deployed in data centers interconnecting >>>>>> virtualized >>>>>> hosts of a tenant. VXLAN addresses requirements of the Layer 2 and >>>>>> Layer 3 data center network infrastructure in the presence of VMs in >>>>>> a multi-tenant environment, discussed in section 3 [RFC7348], by >>>>>> providing Layer 2 overlay scheme on a Layer 3 network. >>>>>> >>>>> >>>>> [ag] This is a lot better. >>>>> >>>>> >>>>>> >>>>>> A VM can communicate with another VM only if they are on the same >>>>>> VXLAN segment. >>>>>>> >>>>>>> the last sentence above is wrong. >>>>>>> >>>>>> GIM>> Section 4 in RFC 7348 states: >>>>>> Only VMs within the same VXLAN segment can communicate with each >>>>>> other. >>>>>> >>>>> >>>>> [ag] VMs on different segments can communicate using routing/IRB, so >>>>> even RFC 7348 is wrong. Perhaps the text should be modified so say -- "In >>>>> the absence of a router in the overlay, a VM can communicate...". >>>>> >>>>> >>>>>> >>>>>> Section 3: >>>>>>> >>> >>>>>>> Most deployments will have VMs with only L2 capabilities that >>>>>>> may not support L3. >>>>>>> >>> >>>>>>> Are you suggesting most deployments have VMs with no IP >>>>>>> addresses/configuration? >>>>>>> >>>>>> GIM>> Would re-word as follows: >>>>>> OLD TEXT: >>>>>> Most deployments will have VMs with only L2 capabilities that >>>>>> may not support L3. >>>>>> NEW TEXT: >>>>>> Deployments may have VMs with only L2 capabilities that do not >>>>>> support L3. >>>>>> >>>>> >>>>> [ag] I still don't understand this. What does it mean for a VM to not >>>>> support L3? No IP address, no default GW, something else? >>>>> >>>> GIM2>> VM communicates with its VTEP which, in turn, originates VXLAN >>>> tunnel. VM is not required to have IP address as it is VTEP's IP address >>>> that VM's MAC is associated with. As for gateway, RFC 7348 discusses VXLAN >>>> gateway as the device that forwards traffice between VXLAN and non-VXLAN >>>> domains. Considering all that, would the following change be acceptable: >>>> OLD TEXT: >>>> Most deployments will have VMs with only L2 capabilities that >>>> may not support L3. >>>> NEW TEXT: >>>> Most deployments will have VMs with only L2 capabilities and not have >>>> an IP address assigned. >>>> >>> >>> [ag2] Do you have a reference for this (i.e. that most deployments have >>> VMs without an IP address)? Normally I would think VMs would have an IP >>> address. It's just that they are segregated into segments and, without an >>> intervening router, they are restricted to communicate only within their >>> subnet. >>> >> GIM3>> Would the following text be acceptable: >> >> Deployments might have VMs with only L2 capabilities and not have an IP >> address assigned or, >> in other cases, VMs are assigned IP address but are restricted to >> communicate only within their subnet. >> >> > [ag3] Yes, this is better. > > >>>>> >>>>>> >>>>>>> >>> >>>>>>> Having a hierarchical OAM model helps localize faults though it >>>>>>> requires additional consideration. >>>>>>> >>> >>>>>>> What are the additional considerations? >>>>>>> >>>>>> GIM>> For example, coordination of BFD intervals across the OAM >>>>>> layers. >>>>>> >>>>> >>>>> [ag] Can we mention them in the draft? >>>>> >>>>> >>>>>> >>>>>>> Would be useful to add a reference to RFC 8293 in case the reader >>>>>>> would like to know more about service nodes. >>>>>>> >>>>>> GIM>> I have to admit that I don't find how RFC 8293 A Framework for >>>>>> Multicast in Network Virtualization over Layer 3 is related to this >>>>>> document. Please help with additional reference to the text of the >>>>>> document. >>>>>> >>>>> >>>>> [ag] The RFC discusses the use of service nodes which is mentioned >>>>> here. >>>>> >>>>> >>>>>> >>>>>>> Section 4 >>>>>>> >>> >>>>>>> Separate BFD sessions can be established between the VTEPs (IP1 and >>>>>>> IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200). >>>>>>> >>> >>>>>>> IMO, the document should mention that this could lead to scaling >>>>>>> issues given that VTEPs can support well in excess of 4K VNIs. >>>>>>> Additionally, we should mention that with IRB, a given VNI may not even >>>>>>> exist on the destination VTEP. Finally, what is the benefit of doing >>>>>>> this? There may be certain corner cases where it's useful (vs a single BFD >>>>>>> session between the VTEPs for all VNIs) but it would be good to explain >>>>>>> what those are. >>>>>>> >>>>>> GIM>> Will add text in the Security Considerations section that VTEPs >>>>>> should have limit on number of BFD sessions. >>>>>> >>>>> >>>>> [ag] I was hoping for two things: >>>>> - A mention about the scalability issue right where per-VNI BFD is >>>>> discussed. (Not sure why that is a security issue/consideration.) >>>>> >>>> GIM2>> I've added the following sentense in both places: >>>> The implementation SHOULD have a reasonable upper bound on the number >>>> of BFD sessions that can be created between the same pair of VTEPs. >>>> >>> >>> [ag2] What is the criteria for determining what is reasonable? >>> >> GIM>> I usually understand that as requirement to make it controllable, >> have configurable limit. Thus it will be up to an network operator to set >> the limit. >> >>> >>> >>>> - What is the benefit of running BFD per VNI between a pair of VTEPs? >>>>> >>>> GIM2>> An alternative would be to run CFM between VMs, if there's the >>>> need to monitor liveliness of the particular VM. Again, this is optional. >>>> >>> >>> [ag2] I'm not sure how running per-VNI BFD between the VTEPs allows one >>> to monitor the liveliness of VMs. >>> >> > [ag3] I think you missed responding to this. I'm not sure of the value of > running BFD per VNI between VTEPs. What am I getting that is not covered > by running a single BFD session with VNI 0 between the VTEPs? > > >> >>> >>>> >>>>> >>>>>> >>>>>>> Sections 5.1 and 6.1 >>>>>>> >>>>>>> In 5.1 we have >>>>>>> >>> >>>>>>> The inner MAC frame carrying the BFD payload has the >>>>>>> following format: >>>>>>> ... Source IP: IP address of the originating VTEP. Destination IP: >>>>>>> IP address of the terminating VTEP. >>>>>>> >>> >>>>>>> >>>>>>> In 6.1 we have >>>>>>> >>> >>>>>>> >>>>>>> Since multiple BFD sessions may be running between two >>>>>>> VTEPs, there needs to be a mechanism for demultiplexing received BF >>>>>>> >>>>>>> packets to the proper session. The procedure for demultiplexing >>>>>>> packets with Your Discriminator equal to 0 is different from[RFC5880 ]. >>>>>>> >>>>>>> *For such packets, the BFD session MUST be identified* >>>>>>> >>>>>>> *using the inner headers, i.e., the source IP and the destination IP >>>>>>> present in the IP header carried by the payload of the VXLAN* >>>>>>> >>>>>>> *encapsulated packet.* >>>>>>> >>>>>>> >>>>>>> >>> >>>>>>> How does this work if the source IP and dest IP are the same as >>>>>>> specified in 5.1? >>>>>>> >>>>>> GIM>> You're right, Destination and source IP addresses likely are >>>>>> the same in this case. Will add that the source UDP port number, along with >>>>>> the pair of IP addresses, MUST be used to demux received BFD control >>>>>> packets. Would you agree that will be sufficient? >>>>>> >>>>> >>>>> [ag] Yes, I think that should work. >>>>> >>>>>> >>>>>>> Editorial >>>>>>> >>>>>> >>>>> [ag] Agree with all comments on this section. >>>>> >>>>>> >>>>>>> - Terminology section should be renamed to acronyms. >>>>>>> >>>>>> GIM>> Accepted >>>>>> >>>>>>> - Document would benefit from a thorough editorial scrub, but maybe >>>>>>> that will happen once it gets to the RFC editor. >>>>>>> >>>>>> GIM>> Will certainly have helpful comments from ADs and RFC editor. >>>>>> >>>>>>> >>>>>>> Section 1 >>>>>>> >>> >>>>>>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348 >>>>>>> ]. provides an encapsulation >>>>>>> scheme that allows virtual machines (VMs) to communicate in a data center >>>>>>> network. >>>>>>> >>> >>>>>>> This is not accurate. VXLAN allows you to implement an overlay to >>>>>>> decouple the address space of the attached hosts from that of the network. >>>>>>> >>>>>> GIM>> Thank you for the suggested text. Will change as follows: >>>>>> OLD TEXT: >>>>>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. >>>>>> provides >>>>>> an encapsulation scheme that allows virtual machines (VMs) to >>>>>> communicate in a data center network. >>>>>> NEW TEXT: >>>>>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. provides >>>>>> an encapsulation scheme that allows building an overlay network by >>>>>> decoupling the address space of the attached virtual hosts from >>>>>> that of the network. >>>>>> >>>>>>> >>>>>>> Section 7 >>>>>>> >>>>>>> VTEP's -> VTEPs >>>>>>> >>>>>> GIM>> Yes, thank you. >>>>>> >>>>> --000000000000d3916e057b360ec3 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Anoop,
apologies for the miss. Is = it the last outstanding? Let's bring it to the front then.
- What is the benefit of running BFD per VNI between a pair of VTEPs= ?
GIM2>> An alternative woul= d be to run CFM between VMs, if there's the need to monitor liveliness = of the particular VM. Again, this is optional.=C2=A0

[ag2] I'm not sure how running per-VN= I BFD between the VTEPs allows one to monitor the liveliness of VMs.=C2=A0<= /div>

[ag3] I think you missed responding to this.=C2=A0 I'= m not sure of the value of running BFD per VNI between VTEPs.=C2=A0 What am= I getting that is not covered by running a single BFD session with VNI 0 b= etween the VTEPs?
=C2=A0
GIM3>> I've mi= sspoken. Non-zero VNI is recommended to be used to demultiplex BFD sessions= between the same VTEPs. In section 6.1:
=C2=A0 =C2=A0The pr= ocedure for demultiplexing
=C2=A0 =C2=A0packets with Your Discrim= inator equal to 0 is different from
=C2=A0 =C2=A0[RFC5880].=C2=A0= For such packets, the BFD session MUST be identified
=C2=A0 =C2= =A0using the inner headers, i.e., the source IP and the destination IP
=C2=A0 =C2=A0present in the IP header carried by the payload of the V= XLAN
=C2=A0 =C2=A0encapsulated packet.=C2=A0 The VNI of the packe= t SHOULD be used to derive
=C2=A0 =C2=A0interface-related informa= tion for demultiplexing the packet.

Hope tha= t clarifies the use of non-zero VNI in VXLAN encapsulation of a BFD control= packet.

Regards,
Greg

On Tue, Nov 20, 2018 at 12:14 PM Anoop = Ghanwani <anoop@alumni.duke.edu= > wrote:
=
Hi Greg,

Please see inline prefixed by = [ag3].

Thanks,
Anoop

On Fri, Nov 16, 2018 at 5:29 PM Greg= Mirsky <greg= imirsky@gmail.com> wrote:
Hi Anoop,
thank you = for the discussion. Please find my responses tagged GIM3>>. Also, att= ached diff and the updated working version of the draft. Hope we're con= verging.

Regards,
Greg

On Wed, Nov 14, 2018 at 11:00 PM Anoop = Ghanwani <ano= op@alumni.duke.edu> wrote:
Hi Greg,

Please see i= nline prefixed with [ag2].

Thanks,
Anoop=

On Wed= , Nov 14, 2018 at 9:45 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop,
thank you for the expedient=C2=A0response. I am glad th= at some=C2=A0of my responses have addressed your concerns. Please find foll= owup notes in-line tagged GIM2>>. I've attached the diff to highl= ight the updates applied in the working version. Let me know if these are a= cceptable changes.

Regards,
Greg
On Tue, Nov 13, 2018 at 12:30= PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Hi Greg,

Pl= ease see inline prefixed with [ag].

Thanks,
<= div>Anoop

On Tue, Nov 13= , 2018 at 11:34 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
<= div dir=3D"ltr">
Hi Anoop,
many thanks for the thorough review and detailed comments. = Please find my answers, this time for real, in-line tagged GIM>>.

Regards,
Greg

On Thu, Nov 8, 2018 at 1:58 AM Anoop Ghanwani <<= a href=3D"mailto:anoop@alumni.duke.edu" target=3D"_blank">anoop@alumni.duke= .edu> wrote:

Here are my comments.

Thanks,
Anoop

=3D=3D

Philosophical

Since VXLAN is not an IETF s= tandard, should we be defining a standard for running BFD on it?=C2=A0 Shou= ld we define BFD over Geneve instead which is the official WG selection?=C2= =A0 Is that going to be a separate document?
GIM&= gt;> IS-IS is not on the Standard track either but that had not prevente= d IETF from developing tens of standard track RFCs using RFC 1142 as the no= rmative reference until RFC 7142 re-classified it as historical. A similar = path was followed with IS-IS-TE by publishing RFC 3784 until it was obsolet= ed by RFC 5305 four years later. I understand that Down Reference, i.e., us= ing informational RFC as the normative reference, is not an unusual situati= on.

[ag= ] OK.=C2=A0 I'm not an expert on this part so unless someone else that = is an expert (chairs, AD?) can comment on it, I'll just let it go.
=C2=A0
=C2=A0
<= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex">

=
Technical

Section 1:

This part needs to be rewritten:
>>>
The individual racks may be part of a different Layer 3 network, or they could be in a single Layer 2 network. The VXLAN segments/overlays are overlaid on top of Layer 3 network. A VM can communicate with another VM only if they are on the same VXLAN segment.
>>>
It's hard t= o parse and, given IRB,
GIM>> Would the= following text be acceptable:
OLD TEXT:
=C2=A0 = =C2=A0VXLAN is typically deployed in data centers interconnecting
=C2=A0 =C2=A0virtualized hosts, which may be spread across multiple racks.= =C2=A0 The
=C2=A0 =C2=A0individual racks may be part of a differe= nt Layer 3 network, or they
=C2=A0 =C2=A0could be in a single Lay= er 2 network.=C2=A0 The VXLAN segments/overlays
=C2=A0 =C2=A0are = overlaid on top of Layer 3 network.
NEW TEXT:
VXLAN is typically deployed in data centers interconnect= ing virtualized=C2=A0
hosts of a tenant. VX= LAN addresses requirements of the Layer 2 and=C2=A0
Layer 3 data center network infrastructure in the presence of VMs = in=C2=A0
a multi-tenant environment, discus= sed in section 3 [RFC7348], by
=C2=A0provid= ing Layer 2 overlay scheme on a Layer 3 network.

[ag] This is a lot better.
=C2=A0

=C2=A0A VM can communicate with another VM only if they are on th= e same
VXLAN segment.
the last sentenc= e above is wrong.
GIM>> Section 4 in RFC= 7348 states:
Only VMs within the same VXLAN segment can communic= ate with=C2=A0each other.

[ag] VMs o= n different segments can communicate using routing/IRB, so even RFC 7348 is= wrong.=C2=A0 Perhaps the text should be modified so say -- "In the ab= sence of a router in the overlay, a VM can communicate...".
= =C2=A0
<= div>Section 3:
>>>
=C2=A0= Most deployments will have VMs with only L2 capabilities that
<= span style=3D"color:rgb(0,0,0);font-family:monospace;font-size:13.3333px;wh= ite-space:pre-wrap">may not support L3.
>>>
A= re you suggesting most deployments have VMs with no IP addresses/configurat= ion?
GIM>> Would re-word as follows:
OLD TEXT:
=C2=A0Most deployments will have VMs with only L= 2 capabilities that
=C2=A0may not support L3.
NEW TEXT:=
Deployments may have VMs with only L2 capabilities that do not s= upport L3.=C2=A0
=
<= div dir=3D"ltr">

[ag] I still don't understand this.=C2=A0 What does it mean fo= r a VM to not support L3?=C2=A0 No IP address, no default GW, something els= e?
GIM2>> VM communicates wi= th its VTEP which, in turn, originates VXLAN tunnel. VM is not required to = have IP address as it is VTEP's IP address that VM's MAC is associa= ted with. As for gateway, RFC 7348 discusses VXLAN gateway as the device th= at forwards traffice between VXLAN and non-VXLAN domains. Considering all t= hat, would the following change be acceptable:
OLD TEXT:
=C2=A0Most deployments will have VMs with only L2 capabilities that<= /div>
=C2=A0may not support L3.
NEW TEXT:
=C2=A0Most deployments will have VMs with only L2 capabilities and not ha= ve an IP address assigned.
<= br>
[ag2] Do you have a reference for this (i.e. that most deploy= ments have VMs without an IP address)?=C2=A0 Normally I would think VMs wou= ld have an IP address.=C2=A0 It's just that they are segregated into se= gments and, without an intervening router, they are restricted to communica= te only within their subnet.
GIM3>> Would the following text be acceptable:
Deployments might have VMs with only L2 capabil= ities and not have an IP address assigned or,
in other cases, VMs are assigned IP address but ar= e restricted to communicate only within their subnet.=C2=A0=C2=A0

[ag3] Yes, this= is better.

=C2=A0
<= div dir=3D"ltr">

>>>
Having= a hierarchical OAM model helps localize faults though it requires additional consideration.
&g= t;>>
What are the additional considerations?
GIM>> For example, coordinat= ion of BFD intervals across the OAM layers.=C2=A0=C2=A0
<= /div>

[ag] Can we mention them in the draft?
=C2= =A0

Would be useful= to add a reference to RFC 8293 in case the reader would like to know more = about service nodes.
= GIM>> I have to admit that I don't find how RFC 8293=C2=A0=C2=A0A= Framework for Multicast in Network Virtualization over Layer 3 is related = to this document. Please help with additional reference to the text of the = document.=C2=A0=C2=A0

[ag] The RF= C discusses the use of service nodes which is mentioned here.=C2=A0=C2=A0
=C2=A0
<= div dir=3D"ltr">

Sec= tion 4
>>>
Separate BFD sessions can be established between the VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200).
>>>
IMO, the document should mention that this could l= ead to scaling issues given that VTEPs can support well in excess of 4K VNI= s.=C2=A0 Additionally, we should mention that with IRB, a given VNI may not= even exist on the destination VTEP.=C2=A0 Finally, what is the benefit of = doing this?=C2=A0 There may be certain corner cases where it's useful (= vs a single BFD session between the VTEPs for all VNIs) but it would be goo= d to explain what those are.
GIM>> Will add text in the Security Considerations section th= at VTEPs should have limit on number of BFD sessions.=C2=A0

[ag] I was hoping for two things:
- A = mention about the scalability issue right where per-VNI BFD is discussed.= =C2=A0 (Not sure why that is a security issue/consideration.)
GIM2>> I've added the following sente= nse in both places:
The implementation SHOULD have a reasonable u= pper bound on the number of BFD sessions that can be created between the sa= me pair of VTEPs.=C2=A0

=
[ag2] What is the criteria for determining what is reasonable?
GIM>> I usually understand th= at as requirement to make it controllable, have configurable limit. Thus it= will be up to an network operator to set the limit.=C2=A0
=C2=A0
=
- What is the benefit of running BFD p= er VNI between a pair of VTEPs?
GI= M2>> An alternative would be to run CFM between VMs, if there's t= he need to monitor liveliness of the particular VM. Again, this is optional= .=C2=A0

[ag2] I'= ;m not sure how running per-VNI BFD between the VTEPs allows one to monitor= the liveliness of VMs.=C2=A0

[ag3] I think you missed re= sponding to this.=C2=A0 I'm not sure of the value of running BFD per VN= I between VTEPs.=C2=A0 What am I getting that is not covered by running a s= ingle BFD session with VNI 0 between the VTEPs?
=C2=A0
=C2=A0
<= div>=C2=A0

Secti= ons 5.1 and 6.1

In 5.1 we have
>>&= gt;
The inner MAC frame carrying the BFD pay= load has the
following format:
... Source IP: IP address of the originating VTEP. Destination IP: IP address of the terminating VTEP.
>>>

In 6.1 = we have=C2=A0
>>>
Since multiple BFD sessions may be runni=
ng between two
VTEPs, there needs to be a mechanism for demultiplexing received BF
packets to the= proper session. The procedure for demultiplexing packets with Your Discriminator equal to 0 is different from[RFC5880].
For such pac= kets, the BFD session MUST be identified
using the inner headers=
, i.e., the source IP and the destination IP
present in the IP header carried by the payload of the VXLAN
enc=
apsulated packet.

>>>
How does t= his work if the source IP and dest IP are the same as specified in 5.1?
GIM>> You're right, Destination and sou= rce IP addresses likely are the same in this case. Will add that the source= UDP port number, along with the pair of IP addresses, MUST be used to demu= x received BFD control packets. Would you agree that will be sufficient?=C2= =A0
=

[ag] Yes, I think that should work.= =C2=A0

Editorial<= /div>

[ag] Agree with all c= omments on this section.=C2=A0
=
- Terminology section should be renamed to acronyms.
GIM>> Accepted=C2=A0
- Document would benefit fr= om a thorough editorial scrub, but maybe that will happen once it gets to t= he RFC editor.
GIM>> Will certainly have= helpful comments from ADs and RFC editor.

Section 1
=
>>>
"Virtual eXtensible L= ocal Area Network" (VXLAN) [RFC7348]. provides an encapsulation scheme that allows virtual machines (VMs) to communicate in a data center network.
>>>
This is not accurate.=C2=A0 VXLAN allows you to implement an overlay= to decouple the address space of the attached hosts from that of the netwo= rk.
GIM>> Thank you for the suggested te= xt. Will change as follows:
OLD TEXT:
=C2=A0 =C2=A0&quo= t;Virtual eXtensible Local Area Network" (VXLAN) [RFC7348].=C2=A0 prov= ides
=C2=A0 =C2=A0an encapsulation scheme that allows virtual mac= hines (VMs) to
=C2=A0 =C2=A0communicate in a data center network.= =C2=A0
NEW TEXT:
=C2=A0"Virtual eXtensible Lo= cal Area Network" (VXLAN) [RFC7348].=C2=A0 provides
=C2=A0 = =C2=A0an encapsulation scheme that allows building an overlay network by=C2= =A0
=C2=A0 decoupling the address space of the attached virtual h= osts from that of the network.

Section 7
<= br>
VTEP's -> VTEPs
GIM>> Yes, thank you.=C2=A0
--000000000000d3916e057b360ec3-- From nobody Thu Nov 22 04:54:49 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BF6A8124C04; Wed, 21 Nov 2018 23:00:16 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.666 X-Spam-Level: X-Spam-Status: No, score=-0.666 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.001, HTML_FONT_FACE_BAD=0.981, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2O-RLCHQuT4W; Wed, 21 Nov 2018 23:00:11 -0800 (PST) Received: from mail-vk1-f196.google.com (mail-vk1-f196.google.com [209.85.221.196]) (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 54BC9128C65; Wed, 21 Nov 2018 23:00:11 -0800 (PST) Received: by mail-vk1-f196.google.com with SMTP id 197so1788820vkf.4; Wed, 21 Nov 2018 23:00:11 -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=L2HS/M0MNHjKLXGmLM90t9I4wmK2jii+7oAskPmpXH4=; b=kjJVCziCpC7SriSeuwx5UWpw20bZia57bzvjv6QzcgwtT9Rh5dIpNPyyZ8w11jtfBF LiT+pklTHKnwql8ymeZXRrbMxOVozz4k2EoflspSpPTkoDzEDuluEC5HPCI/5OCk/iud RgF48WtgLn9jhS8XRjZLo6EXtTbvHUK4cqljxVUa10ZFUzmYR7TU7DLJ8tV4enzvQ0ko jFSH21UYahi17A/EHnO+tNHlTGEwtivSQthFfEJRSu1D7wPGTrYVb44kf0pRA06qSYRe 0ehzKdsM9AISSBy6wTyFQMs8jEUFJXjuFArOjqNbwJCJdXtIdYmvxKaLNvXqraUfbxrB /BwA== X-Gm-Message-State: AA+aEWbXZIP3tvMT8S+1hs1yDuK2CdERJjt65M8/GNuSgVrJUeJB93Xd 5k72FTpDzT8b2pBan0fhMhdkl2P8KH8x3inFMW4= X-Google-Smtp-Source: AFSGD/UEecJUGBN1PkL6kENGtDwPgV9nt6RL+TDebsUST1zHOv5uJNcTAC+ALkXirAbaM4DuKM0n8QWxVyRoDkEvKrg= X-Received: by 2002:a1f:a04b:: with SMTP id j72mr3945576vke.51.1542870010090; Wed, 21 Nov 2018 23:00:10 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Anoop Ghanwani Date: Wed, 21 Nov 2018 22:59:56 -0800 Message-ID: Subject: Re: WGLC comments on draft-ietf-bfd-vxlan To: Greg Mirsky Cc: rtg-bfd@ietf.org, nvo3@ietf.org Content-Type: multipart/alternative; boundary="000000000000e2d9b4057b3b6ae9" Archived-At: X-Mailman-Approved-At: Thu, 22 Nov 2018 04:54:47 -0800 X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Nov 2018 07:00:17 -0000 --000000000000e2d9b4057b3b6ae9 Content-Type: text/plain; charset="UTF-8" Hi Greg, See below prefixed with [ag4]. Thanks, Anoop On Wed, Nov 21, 2018 at 4:36 PM Greg Mirsky wrote: > Hi Anoop, > apologies for the miss. Is it the last outstanding? Let's bring it to the > front then. > > - What is the benefit of running BFD per VNI between a pair of VTEPs? >>>>> >>>> GIM2>> An alternative would be to run CFM between VMs, if there's the >>>> need to monitor liveliness of the particular VM. Again, this is optional. >>>> >>> >>> [ag2] I'm not sure how running per-VNI BFD between the VTEPs allows one >>> to monitor the liveliness of VMs. >>> >> > [ag3] I think you missed responding to this. I'm not sure of the value of > running BFD per VNI between VTEPs. What am I getting that is not covered > by running a single BFD session with VNI 0 between the VTEPs? > > GIM3>> I've misspoken. Non-zero VNI is recommended to be used to > demultiplex BFD sessions between the same VTEPs. In section 6.1: > The procedure for demultiplexing > packets with Your Discriminator equal to 0 is different from > [RFC5880]. For such packets, the BFD session MUST be identified > using the inner headers, i.e., the source IP and the destination IP > present in the IP header carried by the payload of the VXLAN > encapsulated packet. The VNI of the packet SHOULD be used to derive > interface-related information for demultiplexing the packet. > > Hope that clarifies the use of non-zero VNI in VXLAN encapsulation of a > BFD control packet. > [ag4] This tells me how the VNI is used for BFD packets being sent/received. What is the use case/benefit of doing that? I am creating a special interface with VNI 0 just for BFD. Why do I now need to run BFD on any/all of the other VNIs? As a developer, if I read this spec, should I be building this capability or not? Basically what I'm getting at is I think the draft should recommend using VNI 0. If there is a convincing use case for running BFD over other VNIs serviced by that VTEP, then that needs to be explained. But as I mentioned before, this leads to scaling issues. So given the scaling issues, it would be good if an implementation only needed to worry about sending BFD messages on VNI 0. > > Regards, > Greg > > On Tue, Nov 20, 2018 at 12:14 PM Anoop Ghanwani > wrote: > >> Hi Greg, >> >> Please see inline prefixed by [ag3]. >> >> Thanks, >> Anoop >> >> On Fri, Nov 16, 2018 at 5:29 PM Greg Mirsky >> wrote: >> >>> Hi Anoop, >>> thank you for the discussion. Please find my responses tagged GIM3>>. >>> Also, attached diff and the updated working version of the draft. Hope >>> we're converging. >>> >>> Regards, >>> Greg >>> >>> On Wed, Nov 14, 2018 at 11:00 PM Anoop Ghanwani >>> wrote: >>> >>>> Hi Greg, >>>> >>>> Please see inline prefixed with [ag2]. >>>> >>>> Thanks, >>>> Anoop >>>> >>>> On Wed, Nov 14, 2018 at 9:45 AM Greg Mirsky >>>> wrote: >>>> >>>>> Hi Anoop, >>>>> thank you for the expedient response. I am glad that some of my >>>>> responses have addressed your concerns. Please find followup notes in-line >>>>> tagged GIM2>>. I've attached the diff to highlight the updates applied in >>>>> the working version. Let me know if these are acceptable changes. >>>>> >>>>> Regards, >>>>> Greg >>>>> >>>>> On Tue, Nov 13, 2018 at 12:30 PM Anoop Ghanwani >>>>> wrote: >>>>> >>>>>> Hi Greg, >>>>>> >>>>>> Please see inline prefixed with [ag]. >>>>>> >>>>>> Thanks, >>>>>> Anoop >>>>>> >>>>>> On Tue, Nov 13, 2018 at 11:34 AM Greg Mirsky >>>>>> wrote: >>>>>> >>>>>>> Hi Anoop, >>>>>>> many thanks for the thorough review and detailed comments. Please >>>>>>> find my answers, this time for real, in-line tagged GIM>>. >>>>>>> >>>>>>> Regards, >>>>>>> Greg >>>>>>> >>>>>>> On Thu, Nov 8, 2018 at 1:58 AM Anoop Ghanwani >>>>>>> wrote: >>>>>>> >>>>>>>> >>>>>>>> Here are my comments. >>>>>>>> >>>>>>>> Thanks, >>>>>>>> Anoop >>>>>>>> >>>>>>>> == >>>>>>>> >>>>>>>> Philosophical >>>>>>>> >>>>>>>> Since VXLAN is not an IETF standard, should we be defining a >>>>>>>> standard for running BFD on it? Should we define BFD over Geneve instead >>>>>>>> which is the official WG selection? Is that going to be a separate >>>>>>>> document? >>>>>>>> GIM>> IS-IS is not on the Standard track either but that had not >>>>>>>> prevented IETF from developing tens of standard track RFCs using RFC 1142 >>>>>>>> as the normative reference until RFC 7142 re-classified it as historical. A >>>>>>>> similar path was followed with IS-IS-TE by publishing RFC 3784 until it was >>>>>>>> obsoleted by RFC 5305 four years later. I understand that Down Reference, >>>>>>>> i.e., using informational RFC as the normative reference, is not an unusual >>>>>>>> situation. >>>>>>>> >>>>>>> >>>>>> [ag] OK. I'm not an expert on this part so unless someone else that >>>>>> is an expert (chairs, AD?) can comment on it, I'll just let it go. >>>>>> >>>>>> >>>>>>> >>>>>>> >>>>>>>> >>>>>>>> Technical >>>>>>>> >>>>>>>> Section 1: >>>>>>>> >>>>>>>> This part needs to be rewritten: >>>>>>>> >>> >>>>>>>> The individual racks may be part of a different Layer 3 network, or >>>>>>>> they could be in a single Layer 2 network. The VXLAN segments/overlays are >>>>>>>> overlaid on top of Layer 3 network. A VM can communicate with another VM >>>>>>>> only if they are on the same VXLAN segment. >>>>>>>> >>> >>>>>>>> It's hard to parse and, given IRB, >>>>>>>> >>>>>>> GIM>> Would the following text be acceptable: >>>>>>> OLD TEXT: >>>>>>> VXLAN is typically deployed in data centers interconnecting >>>>>>> virtualized hosts, which may be spread across multiple racks. The >>>>>>> individual racks may be part of a different Layer 3 network, or >>>>>>> they >>>>>>> could be in a single Layer 2 network. The VXLAN segments/overlays >>>>>>> are overlaid on top of Layer 3 network. >>>>>>> NEW TEXT: >>>>>>> VXLAN is typically deployed in data centers interconnecting >>>>>>> virtualized >>>>>>> hosts of a tenant. VXLAN addresses requirements of the Layer 2 and >>>>>>> Layer 3 data center network infrastructure in the presence of VMs in >>>>>>> a multi-tenant environment, discussed in section 3 [RFC7348], by >>>>>>> providing Layer 2 overlay scheme on a Layer 3 network. >>>>>>> >>>>>> >>>>>> [ag] This is a lot better. >>>>>> >>>>>> >>>>>>> >>>>>>> A VM can communicate with another VM only if they are on the same >>>>>>> VXLAN segment. >>>>>>>> >>>>>>>> the last sentence above is wrong. >>>>>>>> >>>>>>> GIM>> Section 4 in RFC 7348 states: >>>>>>> Only VMs within the same VXLAN segment can communicate with each >>>>>>> other. >>>>>>> >>>>>> >>>>>> [ag] VMs on different segments can communicate using routing/IRB, so >>>>>> even RFC 7348 is wrong. Perhaps the text should be modified so say -- "In >>>>>> the absence of a router in the overlay, a VM can communicate...". >>>>>> >>>>>> >>>>>>> >>>>>>> Section 3: >>>>>>>> >>> >>>>>>>> Most deployments will have VMs with only L2 capabilities that >>>>>>>> may not support L3. >>>>>>>> >>> >>>>>>>> Are you suggesting most deployments have VMs with no IP >>>>>>>> addresses/configuration? >>>>>>>> >>>>>>> GIM>> Would re-word as follows: >>>>>>> OLD TEXT: >>>>>>> Most deployments will have VMs with only L2 capabilities that >>>>>>> may not support L3. >>>>>>> NEW TEXT: >>>>>>> Deployments may have VMs with only L2 capabilities that do not >>>>>>> support L3. >>>>>>> >>>>>> >>>>>> [ag] I still don't understand this. What does it mean for a VM to >>>>>> not support L3? No IP address, no default GW, something else? >>>>>> >>>>> GIM2>> VM communicates with its VTEP which, in turn, originates VXLAN >>>>> tunnel. VM is not required to have IP address as it is VTEP's IP address >>>>> that VM's MAC is associated with. As for gateway, RFC 7348 discusses VXLAN >>>>> gateway as the device that forwards traffice between VXLAN and non-VXLAN >>>>> domains. Considering all that, would the following change be acceptable: >>>>> OLD TEXT: >>>>> Most deployments will have VMs with only L2 capabilities that >>>>> may not support L3. >>>>> NEW TEXT: >>>>> Most deployments will have VMs with only L2 capabilities and not have >>>>> an IP address assigned. >>>>> >>>> >>>> [ag2] Do you have a reference for this (i.e. that most deployments have >>>> VMs without an IP address)? Normally I would think VMs would have an IP >>>> address. It's just that they are segregated into segments and, without an >>>> intervening router, they are restricted to communicate only within their >>>> subnet. >>>> >>> GIM3>> Would the following text be acceptable: >>> >>> Deployments might have VMs with only L2 capabilities and not have an IP >>> address assigned or, >>> in other cases, VMs are assigned IP address but are restricted to >>> communicate only within their subnet. >>> >>> >> [ag3] Yes, this is better. >> >> >>>>>> >>>>>>> >>>>>>>> >>> >>>>>>>> Having a hierarchical OAM model helps localize faults though it >>>>>>>> requires additional consideration. >>>>>>>> >>> >>>>>>>> What are the additional considerations? >>>>>>>> >>>>>>> GIM>> For example, coordination of BFD intervals across the OAM >>>>>>> layers. >>>>>>> >>>>>> >>>>>> [ag] Can we mention them in the draft? >>>>>> >>>>>> >>>>>>> >>>>>>>> Would be useful to add a reference to RFC 8293 in case the reader >>>>>>>> would like to know more about service nodes. >>>>>>>> >>>>>>> GIM>> I have to admit that I don't find how RFC 8293 A Framework >>>>>>> for Multicast in Network Virtualization over Layer 3 is related to this >>>>>>> document. Please help with additional reference to the text of the >>>>>>> document. >>>>>>> >>>>>> >>>>>> [ag] The RFC discusses the use of service nodes which is mentioned >>>>>> here. >>>>>> >>>>>> >>>>>>> >>>>>>>> Section 4 >>>>>>>> >>> >>>>>>>> Separate BFD sessions can be established between the VTEPs (IP1 and >>>>>>>> IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200). >>>>>>>> >>> >>>>>>>> IMO, the document should mention that this could lead to scaling >>>>>>>> issues given that VTEPs can support well in excess of 4K VNIs. >>>>>>>> Additionally, we should mention that with IRB, a given VNI may not even >>>>>>>> exist on the destination VTEP. Finally, what is the benefit of doing >>>>>>>> this? There may be certain corner cases where it's useful (vs a single BFD >>>>>>>> session between the VTEPs for all VNIs) but it would be good to explain >>>>>>>> what those are. >>>>>>>> >>>>>>> GIM>> Will add text in the Security Considerations section that >>>>>>> VTEPs should have limit on number of BFD sessions. >>>>>>> >>>>>> >>>>>> [ag] I was hoping for two things: >>>>>> - A mention about the scalability issue right where per-VNI BFD is >>>>>> discussed. (Not sure why that is a security issue/consideration.) >>>>>> >>>>> GIM2>> I've added the following sentense in both places: >>>>> The implementation SHOULD have a reasonable upper bound on the number >>>>> of BFD sessions that can be created between the same pair of VTEPs. >>>>> >>>> >>>> [ag2] What is the criteria for determining what is reasonable? >>>> >>> GIM>> I usually understand that as requirement to make it controllable, >>> have configurable limit. Thus it will be up to an network operator to set >>> the limit. >>> >>>> >>>> >>>>> - What is the benefit of running BFD per VNI between a pair of VTEPs? >>>>>> >>>>> GIM2>> An alternative would be to run CFM between VMs, if there's the >>>>> need to monitor liveliness of the particular VM. Again, this is optional. >>>>> >>>> >>>> [ag2] I'm not sure how running per-VNI BFD between the VTEPs allows one >>>> to monitor the liveliness of VMs. >>>> >>> >> [ag3] I think you missed responding to this. I'm not sure of the value >> of running BFD per VNI between VTEPs. What am I getting that is not >> covered by running a single BFD session with VNI 0 between the VTEPs? >> >> >>> >>>> >>>>> >>>>>> >>>>>>> >>>>>>>> Sections 5.1 and 6.1 >>>>>>>> >>>>>>>> In 5.1 we have >>>>>>>> >>> >>>>>>>> The inner MAC frame carrying the BFD payload has the >>>>>>>> following format: >>>>>>>> ... Source IP: IP address of the originating VTEP. Destination IP: >>>>>>>> IP address of the terminating VTEP. >>>>>>>> >>> >>>>>>>> >>>>>>>> In 6.1 we have >>>>>>>> >>> >>>>>>>> >>>>>>>> Since multiple BFD sessions may be running between two >>>>>>>> VTEPs, there needs to be a mechanism for demultiplexing received BF >>>>>>>> >>>>>>>> packets to the proper session. The procedure for demultiplexing >>>>>>>> packets with Your Discriminator equal to 0 is different from[RFC5880 ]. >>>>>>>> >>>>>>>> *For such packets, the BFD session MUST be identified* >>>>>>>> >>>>>>>> *using the inner headers, i.e., the source IP and the destination IP >>>>>>>> present in the IP header carried by the payload of the VXLAN* >>>>>>>> >>>>>>>> *encapsulated packet.* >>>>>>>> >>>>>>>> >>>>>>>> >>> >>>>>>>> How does this work if the source IP and dest IP are the same as >>>>>>>> specified in 5.1? >>>>>>>> >>>>>>> GIM>> You're right, Destination and source IP addresses likely are >>>>>>> the same in this case. Will add that the source UDP port number, along with >>>>>>> the pair of IP addresses, MUST be used to demux received BFD control >>>>>>> packets. Would you agree that will be sufficient? >>>>>>> >>>>>> >>>>>> [ag] Yes, I think that should work. >>>>>> >>>>>>> >>>>>>>> Editorial >>>>>>>> >>>>>>> >>>>>> [ag] Agree with all comments on this section. >>>>>> >>>>>>> >>>>>>>> - Terminology section should be renamed to acronyms. >>>>>>>> >>>>>>> GIM>> Accepted >>>>>>> >>>>>>>> - Document would benefit from a thorough editorial scrub, but maybe >>>>>>>> that will happen once it gets to the RFC editor. >>>>>>>> >>>>>>> GIM>> Will certainly have helpful comments from ADs and RFC editor. >>>>>>> >>>>>>>> >>>>>>>> Section 1 >>>>>>>> >>> >>>>>>>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348 >>>>>>>> ]. provides an encapsulation >>>>>>>> scheme that allows virtual machines (VMs) to communicate in a data center >>>>>>>> network. >>>>>>>> >>> >>>>>>>> This is not accurate. VXLAN allows you to implement an overlay to >>>>>>>> decouple the address space of the attached hosts from that of the network. >>>>>>>> >>>>>>> GIM>> Thank you for the suggested text. Will change as follows: >>>>>>> OLD TEXT: >>>>>>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. >>>>>>> provides >>>>>>> an encapsulation scheme that allows virtual machines (VMs) to >>>>>>> communicate in a data center network. >>>>>>> NEW TEXT: >>>>>>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. provides >>>>>>> an encapsulation scheme that allows building an overlay network >>>>>>> by >>>>>>> decoupling the address space of the attached virtual hosts from >>>>>>> that of the network. >>>>>>> >>>>>>>> >>>>>>>> Section 7 >>>>>>>> >>>>>>>> VTEP's -> VTEPs >>>>>>>> >>>>>>> GIM>> Yes, thank you. >>>>>>> >>>>>> --000000000000e2d9b4057b3b6ae9 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Greg,

See below prefixed with [ag4].=

Thanks,
Anoop

On Wed, Nov 21, 2018 at 4:36 PM Greg Mirsky <= ;gregimirsky@gmail.com> wro= te:
Hi Anoop,
apologies for the miss. Is it the last outstanding? Let= 9;s bring it to the front then.

- What is the benefit of = running BFD per VNI between a pair of VTEPs?
GIM2>> An alternative would be to run CFM between VMs, if = there's the need to monitor liveliness of the particular VM. Again, thi= s is optional.=C2=A0

[ag2] I'm not sure how running per-VNI BFD between the VTEPs allows o= ne to monitor the liveliness of VMs.=C2=A0

[ag3] I think = you missed responding to this.=C2=A0 I'm not sure of the value of runni= ng BFD per VNI between VTEPs.=C2=A0 What am I getting that is not covered b= y running a single BFD session with VNI 0 between the VTEPs?
=C2= =A0
GIM3>> I've misspoken. Non-zero VNI is recomm= ended to be used to demultiplex BFD sessions between the same VTEPs. In sec= tion 6.1:
=C2=A0 =C2=A0The procedure for demultiplexing
=C2=A0 =C2=A0packets with Your Discriminator equal to 0 is different = from
=C2=A0 =C2=A0[RFC5880].=C2=A0 For such packets, the BFD sess= ion MUST be identified
=C2=A0 =C2=A0using the inner headers, i.e.= , the source IP and the destination IP
=C2=A0 =C2=A0present in th= e IP header carried by the payload of the VXLAN
=C2=A0 =C2=A0enca= psulated packet.=C2=A0 The VNI of the packet SHOULD be used to derive
=
=C2=A0 =C2=A0interface-related information for demultiplexing the pack= et.

Hope that clarifies the use of non-zero = VNI in VXLAN encapsulation of a BFD control packet.

[ag4] This tells me how the VNI is used for BFD = packets being sent/received.=C2=A0 What is the use case/benefit of doing th= at?=C2=A0 I am creating a special interface with VNI 0 just for BFD.=C2=A0 = Why do I now need to run BFD on any/all of the other VNIs?=C2=A0 As a devel= oper, if I read this spec, should I be building this capability or not?=C2= =A0 Basically what I'm getting at is I think the draft should recommend= using VNI 0.=C2=A0 If there is a convincing use case for running BFD over = other VNIs serviced by that VTEP, then that needs to be explained.=C2=A0 Bu= t as I mentioned before, this leads to scaling issues.=C2=A0 So given the s= caling issues, it would be good if an implementation only needed to worry a= bout sending BFD messages on VNI 0.
=C2=A0

Regards= ,
Greg

On Tu= e, Nov 20, 2018 at 12:14 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Hi Gre= g,

Please see inline prefixed by [ag3].

Thanks,
Anoop

<= div dir=3D"ltr">On Fri, Nov 16, 2018 at 5:29 PM Greg Mirsky <gregimirsky@gmail.com&g= t; wrote:
Hi Anoop,
thank you for the discussion. Ple= ase find my responses tagged GIM3>>. Also, attached diff and the upda= ted working version of the draft. Hope we're converging.

=
Regards,
Greg

On Wed, Nov 14, 2018 at 11:00 PM Anoop Ghanwani <anoop@alumni.duke.edu&= gt; wrote:
Hi Greg,

Please see inline prefixed with [ag= 2].

Thanks,
Anoop
On Wed, Nov 14, 2018 at 9:45 = AM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop,
tha= nk you for the expedient=C2=A0response. I am glad that some=C2=A0of my resp= onses have addressed your concerns. Please find followup notes in-line tagg= ed GIM2>>. I've attached the diff to highlight the updates applie= d in the working version. Let me know if these are acceptable changes.

Regards,
Greg

On Tue, Nov 13, 2018 at 12:30 PM Anoop Ghanwani <= anoop@alumni.duk= e.edu> wrote:
Hi Greg,

Please see inline prefixe= d with [ag].

Thanks,
Anoop

On Tue, Nov 13, 2018 at 11:34 AM Greg= Mirsky <greg= imirsky@gmail.com> wrote:
Hi Anoop,
many th= anks for the thorough review and detailed comments. Please find my answers,= this time for real, in-line tagged GIM>>.

R= egards,
Greg

On Thu, Nov 8, 2018 at 1:58 AM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
=
Here are my comments.

Thanks,
Ano= op

=3D=3D

Philosophical

Since VXLAN is not an IETF standard, should we be d= efining a standard for running BFD on it?=C2=A0 Should we define BFD over G= eneve instead which is the official WG selection?=C2=A0 Is that going to be= a separate document?
GIM>> IS-IS is not on= the Standard track either but that had not prevented IETF from developing = tens of standard track RFCs using RFC 1142 as the normative reference until= RFC 7142 re-classified it as historical. A similar path was followed with = IS-IS-TE by publishing RFC 3784 until it was obsoleted by RFC 5305 four yea= rs later. I understand that Down Reference, i.e., using informational RFC a= s the normative reference, is not an unusual situation.
=

[ag] OK.=C2=A0 I'm not= an expert on this part so unless someone else that is an expert (chairs, A= D?) can comment on it, I'll just let it go.
=C2=A0
=C2=A0

Technical<= /div>

Section 1:

This part need= s to be rewritten:
>>>
Th= e individual racks may be part of a different Layer 3 network, or they could be in a single Layer 2 network. The VXLAN segments/overlays are overlaid on top of Layer 3 network. A VM can communicate with another VM only if they are on the same VXLAN segment.
>>>
It's hard t= o parse and, given IRB,
GIM>> Would the= following text be acceptable:
OLD TEXT:
=C2=A0 = =C2=A0VXLAN is typically deployed in data centers interconnecting
=C2=A0 =C2=A0virtualized hosts, which may be spread across multiple racks.= =C2=A0 The
=C2=A0 =C2=A0individual racks may be part of a differe= nt Layer 3 network, or they
=C2=A0 =C2=A0could be in a single Lay= er 2 network.=C2=A0 The VXLAN segments/overlays
=C2=A0 =C2=A0are = overlaid on top of Layer 3 network.
NEW TEXT:
VXLAN is typically deployed in data centers interconnect= ing virtualized=C2=A0
hosts of a tenant. VX= LAN addresses requirements of the Layer 2 and=C2=A0
Layer 3 data center network infrastructure in the presence of VMs = in=C2=A0
a multi-tenant environment, discus= sed in section 3 [RFC7348], by
=C2=A0provid= ing Layer 2 overlay scheme on a Layer 3 network.

[ag] This is a lot better.
=C2=A0

=C2=A0A VM can communicate with another VM only if they are on th= e same
VXLAN segment.
the last sentenc= e above is wrong.
GIM>> Section 4 in RFC= 7348 states:
Only VMs within the same VXLAN segment can communic= ate with=C2=A0each other.

[ag] VMs o= n different segments can communicate using routing/IRB, so even RFC 7348 is= wrong.=C2=A0 Perhaps the text should be modified so say -- "In the ab= sence of a router in the overlay, a VM can communicate...".
= =C2=A0
<= div>Section 3:
>>>
=C2=A0= Most deployments will have VMs with only L2 capabilities that
<= span style=3D"color:rgb(0,0,0);font-family:monospace;font-size:13.3333px;wh= ite-space:pre-wrap">may not support L3.
>>>
A= re you suggesting most deployments have VMs with no IP addresses/configurat= ion?
GIM>> Would re-word as follows:
OLD TEXT:
=C2=A0Most deployments will have VMs with only L= 2 capabilities that
=C2=A0may not support L3.
NEW TEXT:=
Deployments may have VMs with only L2 capabilities that do not s= upport L3.=C2=A0
=
<= div dir=3D"ltr">

[ag] I still don't understand this.=C2=A0 What does it mean fo= r a VM to not support L3?=C2=A0 No IP address, no default GW, something els= e?
GIM2>> VM communicates wi= th its VTEP which, in turn, originates VXLAN tunnel. VM is not required to = have IP address as it is VTEP's IP address that VM's MAC is associa= ted with. As for gateway, RFC 7348 discusses VXLAN gateway as the device th= at forwards traffice between VXLAN and non-VXLAN domains. Considering all t= hat, would the following change be acceptable:
OLD TEXT:
=C2=A0Most deployments will have VMs with only L2 capabilities that<= /div>
=C2=A0may not support L3.
NEW TEXT:
=C2=A0Most deployments will have VMs with only L2 capabilities and not ha= ve an IP address assigned.
<= br>
[ag2] Do you have a reference for this (i.e. that most deploy= ments have VMs without an IP address)?=C2=A0 Normally I would think VMs wou= ld have an IP address.=C2=A0 It's just that they are segregated into se= gments and, without an intervening router, they are restricted to communica= te only within their subnet.
GIM3>> Would the following text be acceptable:
Deployments might have VMs with only L2 capabil= ities and not have an IP address assigned or,
in other cases, VMs are assigned IP address but ar= e restricted to communicate only within their subnet.=C2=A0=C2=A0

[ag3] Yes, this= is better.

=C2=A0
<= div dir=3D"ltr">

>>>
Having= a hierarchical OAM model helps localize faults though it requires additional consideration.
&g= t;>>
What are the additional considerations?
GIM>> For example, coordinat= ion of BFD intervals across the OAM layers.=C2=A0=C2=A0
<= /div>

[ag] Can we mention them in the draft?
=C2= =A0

Would be useful= to add a reference to RFC 8293 in case the reader would like to know more = about service nodes.
= GIM>> I have to admit that I don't find how RFC 8293=C2=A0=C2=A0A= Framework for Multicast in Network Virtualization over Layer 3 is related = to this document. Please help with additional reference to the text of the = document.=C2=A0=C2=A0

[ag] The RF= C discusses the use of service nodes which is mentioned here.=C2=A0=C2=A0
=C2=A0
<= div dir=3D"ltr">

Sec= tion 4
>>>
Separate BFD sessions can be established between the VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200).
>>>
IMO, the document should mention that this could l= ead to scaling issues given that VTEPs can support well in excess of 4K VNI= s.=C2=A0 Additionally, we should mention that with IRB, a given VNI may not= even exist on the destination VTEP.=C2=A0 Finally, what is the benefit of = doing this?=C2=A0 There may be certain corner cases where it's useful (= vs a single BFD session between the VTEPs for all VNIs) but it would be goo= d to explain what those are.
GIM>> Will add text in the Security Considerations section th= at VTEPs should have limit on number of BFD sessions.=C2=A0

[ag] I was hoping for two things:
- A = mention about the scalability issue right where per-VNI BFD is discussed.= =C2=A0 (Not sure why that is a security issue/consideration.)
GIM2>> I've added the following sente= nse in both places:
The implementation SHOULD have a reasonable u= pper bound on the number of BFD sessions that can be created between the sa= me pair of VTEPs.=C2=A0

=
[ag2] What is the criteria for determining what is reasonable?
GIM>> I usually understand th= at as requirement to make it controllable, have configurable limit. Thus it= will be up to an network operator to set the limit.=C2=A0
=C2=A0
=
- What is the benefit of running BFD p= er VNI between a pair of VTEPs?
GI= M2>> An alternative would be to run CFM between VMs, if there's t= he need to monitor liveliness of the particular VM. Again, this is optional= .=C2=A0

[ag2] I'= ;m not sure how running per-VNI BFD between the VTEPs allows one to monitor= the liveliness of VMs.=C2=A0

[ag3] I think you missed re= sponding to this.=C2=A0 I'm not sure of the value of running BFD per VN= I between VTEPs.=C2=A0 What am I getting that is not covered by running a s= ingle BFD session with VNI 0 between the VTEPs?
=C2=A0
=C2=A0
<= div>=C2=A0

Secti= ons 5.1 and 6.1

In 5.1 we have
>>&= gt;
The inner MAC frame carrying the BFD pay= load has the
following format:
... Source IP: IP address of the originating VTEP. Destination IP: IP address of the terminating VTEP.
>>>
=
In 6.1 we have=C2=A0
>>>
Since multiple BFD sessions may be running between two
VTEPs, there needs to be a mechanism for demultiplexing received BF
packets to the proper session. The procedure for demultiplexing packets with Your Discriminator equal to 0 is different from[RFC5880].
For such packets, the BFD session MUST be identified
using the inner headers, i.e., the source IP and the d=
estination IP
present in the IP header carried by the payload of the VXLAN
encapsulated packet.

>>>= ;
How does this work if the source IP and dest IP are the same as= specified in 5.1?
GIM>> You're righ= t, Destination and source IP addresses likely are the same in this case. Wi= ll add that the source UDP port number, along with the pair of IP addresses= , MUST be used to demux received BFD control packets. Would you agree that = will be sufficient?=C2=A0

[ag] Yes, I th= ink that should work.=C2=A0

Editorial

[a= g] Agree with all comments on this section.=C2=A0
<= div dir=3D"ltr">

- Terminology section should be renamed to a= cronyms.
GIM>> Accepted=C2=A0
- Docume= nt would benefit from a thorough editorial scrub, but maybe that will happe= n once it gets to the RFC editor.
GIM>> = Will certainly have helpful comments from ADs and RFC editor.

<= div>Section 1
>>>
"V= irtual eXtensible Local Area Network" (VXLAN) [RFC7348

Section 7
<= br>
VTEP's -> VTEPs
GIM>> Yes, thank you.=C2=A0
 --000000000000e2d9b4057b3b6ae9-- From nobody Thu Nov 22 12:30:08 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 92D99130F2F; Thu, 22 Nov 2018 12:28:18 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.017 X-Spam-Level: X-Spam-Status: No, score=-1.017 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_FONT_FACE_BAD=0.981, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zIIe8hzn4A3C; Thu, 22 Nov 2018 12:28:14 -0800 (PST) Received: from mail-lf1-x12c.google.com (mail-lf1-x12c.google.com [IPv6:2a00:1450:4864:20::12c]) (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 DD7C7130F86; Thu, 22 Nov 2018 12:28:10 -0800 (PST) Received: by mail-lf1-x12c.google.com with SMTP id p86so7307459lfg.5; Thu, 22 Nov 2018 12:28:10 -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=mO+3JgR2gJepvqE+VZE08qGgy+IEg5Qvu7LMnLzavtk=; b=ZCvpOHtiTTNvUKg2OcGLdTUMtIMu0ZoHGpq9AhuMWmqM3iyvVFG6N8nRdFuH99pNz+ ZLyKAIlHkVGgG7/7vUq784lNWsa9QUbVtS5i4m86vmZ0W3Ais0buGzfBTiuoM5Mjgr5e TRRhXxvicIS8qZXqJK10I66Vcma+jacL+2zrvCOjuvZZxJWAT9g+p1hfSp5dleJSE37S NLf9+sdvl8d89jEKSRxB1LGY1cxuqScvjaFEYczrYeGtw2ovBE/YXEd2mGagaCTMz9Im O9ptbsOFRpAYOBbyYNCCL4iZBTutfgn+eGjcmbDNemuqFWg/lEx/CqShACrwNA6DTydu Jkhg== 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=mO+3JgR2gJepvqE+VZE08qGgy+IEg5Qvu7LMnLzavtk=; b=W730scwYD79NWrKLz8RWRXliUSo+3kE7pjZVnI0I7ix7xHBxDsQS/NAWcgS9KNU2yx sb0J/k1gSZkyfggk5k2vNsaB7KryfMR1JOjY7F9Y2X3b0R2K8mEcicA+JXh93iEhUxuT 81SL38cauwW3f5X8cBmcIu+7fmLILSf16xMt6KpZ6KCzwu2diEr8nZQ07QV/iWfiaCSZ wC8F5xlrDcx2HAdkyCB2o2iS0K9Py632jnRd8o3DAg/v/kDGrwGgyx7SAV7PzC45dTWa gYdKPUs7ok9vlyixdk05fMssFNSYAMXNUq7L57eBQzmh522W2040Nx3p+0dSzMIOm0Os DqVw== X-Gm-Message-State: AGRZ1gICe7CZThiEA2uGEsQiQljlgb1Rt7tPgQb9YeVBZqv4T2ZWLj1L Qpr5qvhdu61F3E8l6IeR4+CkkPxxFAjKEZtVSSwFL6d0 X-Google-Smtp-Source: AJdET5dS7/YTE0MVgWSAcJRU8SsiUjvLT/L2MZ1fMIvq4QFURk4L/Sdc18Yq9DFUM6BOV3hlrxNLmI95bxQzaloj6f8= X-Received: by 2002:a19:a149:: with SMTP id k70mr7335798lfe.5.1542918488849; Thu, 22 Nov 2018 12:28:08 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Greg Mirsky Date: Thu, 22 Nov 2018 12:27:56 -0800 Message-ID: Subject: Re: WGLC comments on draft-ietf-bfd-vxlan To: Anoop Ghanwani Cc: rtg-bfd WG , NVO3 Content-Type: multipart/alternative; boundary="0000000000007201be057b46b469" Archived-At: X-Mailman-Approved-At: Thu, 22 Nov 2018 12:30:06 -0800 X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Nov 2018 20:28:19 -0000 --0000000000007201be057b46b469 Content-Type: text/plain; charset="UTF-8" Hi Anoop, apologies if my explanation was not clear. Non-zero VNIs are recommended to be used by a VTEP that received BFD control packet with zero Your Discriminator value. BFD control packets with non-zero Your Discriminator value will be demultiplexed using only that value. As for the special role of VNI 0 the section 7 of the draft states the following: BFD session MAY be established for the reserved VNI 0. One way to aggregate BFD sessions between VTEP's is to establish a BFD session with VNI 0. A VTEP MAY also use VNI 0 to establish a BFD session with a service node. Would you suggest changing the normative language in this text? Regards, Greg PS. Happy Thanksgiving to All! On Wed, Nov 21, 2018 at 11:00 PM Anoop Ghanwani wrote: > Hi Greg, > > See below prefixed with [ag4]. > > Thanks, > Anoop > > On Wed, Nov 21, 2018 at 4:36 PM Greg Mirsky wrote: > >> Hi Anoop, >> apologies for the miss. Is it the last outstanding? Let's bring it to the >> front then. >> >> - What is the benefit of running BFD per VNI between a pair of VTEPs? >>>>>> >>>>> GIM2>> An alternative would be to run CFM between VMs, if there's the >>>>> need to monitor liveliness of the particular VM. Again, this is optional. >>>>> >>>> >>>> [ag2] I'm not sure how running per-VNI BFD between the VTEPs allows one >>>> to monitor the liveliness of VMs. >>>> >>> >> [ag3] I think you missed responding to this. I'm not sure of the value >> of running BFD per VNI between VTEPs. What am I getting that is not >> covered by running a single BFD session with VNI 0 between the VTEPs? >> >> GIM3>> I've misspoken. Non-zero VNI is recommended to be used to >> demultiplex BFD sessions between the same VTEPs. In section 6.1: >> The procedure for demultiplexing >> packets with Your Discriminator equal to 0 is different from >> [RFC5880]. For such packets, the BFD session MUST be identified >> using the inner headers, i.e., the source IP and the destination IP >> present in the IP header carried by the payload of the VXLAN >> encapsulated packet. The VNI of the packet SHOULD be used to derive >> interface-related information for demultiplexing the packet. >> >> Hope that clarifies the use of non-zero VNI in VXLAN encapsulation of a >> BFD control packet. >> > > [ag4] This tells me how the VNI is used for BFD packets being > sent/received. What is the use case/benefit of doing that? I am creating > a special interface with VNI 0 just for BFD. Why do I now need to run BFD > on any/all of the other VNIs? As a developer, if I read this spec, should > I be building this capability or not? Basically what I'm getting at is I > think the draft should recommend using VNI 0. If there is a convincing use > case for running BFD over other VNIs serviced by that VTEP, then that needs > to be explained. But as I mentioned before, this leads to scaling issues. > So given the scaling issues, it would be good if an implementation only > needed to worry about sending BFD messages on VNI 0. > > >> >> Regards, >> Greg >> >> On Tue, Nov 20, 2018 at 12:14 PM Anoop Ghanwani >> wrote: >> >>> Hi Greg, >>> >>> Please see inline prefixed by [ag3]. >>> >>> Thanks, >>> Anoop >>> >>> On Fri, Nov 16, 2018 at 5:29 PM Greg Mirsky >>> wrote: >>> >>>> Hi Anoop, >>>> thank you for the discussion. Please find my responses tagged GIM3>>. >>>> Also, attached diff and the updated working version of the draft. Hope >>>> we're converging. >>>> >>>> Regards, >>>> Greg >>>> >>>> On Wed, Nov 14, 2018 at 11:00 PM Anoop Ghanwani >>>> wrote: >>>> >>>>> Hi Greg, >>>>> >>>>> Please see inline prefixed with [ag2]. >>>>> >>>>> Thanks, >>>>> Anoop >>>>> >>>>> On Wed, Nov 14, 2018 at 9:45 AM Greg Mirsky >>>>> wrote: >>>>> >>>>>> Hi Anoop, >>>>>> thank you for the expedient response. I am glad that some of my >>>>>> responses have addressed your concerns. Please find followup notes in-line >>>>>> tagged GIM2>>. I've attached the diff to highlight the updates applied in >>>>>> the working version. Let me know if these are acceptable changes. >>>>>> >>>>>> Regards, >>>>>> Greg >>>>>> >>>>>> On Tue, Nov 13, 2018 at 12:30 PM Anoop Ghanwani < >>>>>> anoop@alumni.duke.edu> wrote: >>>>>> >>>>>>> Hi Greg, >>>>>>> >>>>>>> Please see inline prefixed with [ag]. >>>>>>> >>>>>>> Thanks, >>>>>>> Anoop >>>>>>> >>>>>>> On Tue, Nov 13, 2018 at 11:34 AM Greg Mirsky >>>>>>> wrote: >>>>>>> >>>>>>>> Hi Anoop, >>>>>>>> many thanks for the thorough review and detailed comments. Please >>>>>>>> find my answers, this time for real, in-line tagged GIM>>. >>>>>>>> >>>>>>>> Regards, >>>>>>>> Greg >>>>>>>> >>>>>>>> On Thu, Nov 8, 2018 at 1:58 AM Anoop Ghanwani < >>>>>>>> anoop@alumni.duke.edu> wrote: >>>>>>>> >>>>>>>>> >>>>>>>>> Here are my comments. >>>>>>>>> >>>>>>>>> Thanks, >>>>>>>>> Anoop >>>>>>>>> >>>>>>>>> == >>>>>>>>> >>>>>>>>> Philosophical >>>>>>>>> >>>>>>>>> Since VXLAN is not an IETF standard, should we be defining a >>>>>>>>> standard for running BFD on it? Should we define BFD over Geneve instead >>>>>>>>> which is the official WG selection? Is that going to be a separate >>>>>>>>> document? >>>>>>>>> GIM>> IS-IS is not on the Standard track either but that had not >>>>>>>>> prevented IETF from developing tens of standard track RFCs using RFC 1142 >>>>>>>>> as the normative reference until RFC 7142 re-classified it as historical. A >>>>>>>>> similar path was followed with IS-IS-TE by publishing RFC 3784 until it was >>>>>>>>> obsoleted by RFC 5305 four years later. I understand that Down Reference, >>>>>>>>> i.e., using informational RFC as the normative reference, is not an unusual >>>>>>>>> situation. >>>>>>>>> >>>>>>>> >>>>>>> [ag] OK. I'm not an expert on this part so unless someone else that >>>>>>> is an expert (chairs, AD?) can comment on it, I'll just let it go. >>>>>>> >>>>>>> >>>>>>>> >>>>>>>> >>>>>>>>> >>>>>>>>> Technical >>>>>>>>> >>>>>>>>> Section 1: >>>>>>>>> >>>>>>>>> This part needs to be rewritten: >>>>>>>>> >>> >>>>>>>>> The individual racks may be part of a different Layer 3 network, >>>>>>>>> or they could be in a single Layer 2 network. The VXLAN segments/overlays >>>>>>>>> are overlaid on top of Layer 3 network. A VM can communicate with another >>>>>>>>> VM only if they are on the same VXLAN segment. >>>>>>>>> >>> >>>>>>>>> It's hard to parse and, given IRB, >>>>>>>>> >>>>>>>> GIM>> Would the following text be acceptable: >>>>>>>> OLD TEXT: >>>>>>>> VXLAN is typically deployed in data centers interconnecting >>>>>>>> virtualized hosts, which may be spread across multiple racks. >>>>>>>> The >>>>>>>> individual racks may be part of a different Layer 3 network, or >>>>>>>> they >>>>>>>> could be in a single Layer 2 network. The VXLAN >>>>>>>> segments/overlays >>>>>>>> are overlaid on top of Layer 3 network. >>>>>>>> NEW TEXT: >>>>>>>> VXLAN is typically deployed in data centers interconnecting >>>>>>>> virtualized >>>>>>>> hosts of a tenant. VXLAN addresses requirements of the Layer 2 and >>>>>>>> Layer 3 data center network infrastructure in the presence of VMs >>>>>>>> in >>>>>>>> a multi-tenant environment, discussed in section 3 [RFC7348], by >>>>>>>> providing Layer 2 overlay scheme on a Layer 3 network. >>>>>>>> >>>>>>> >>>>>>> [ag] This is a lot better. >>>>>>> >>>>>>> >>>>>>>> >>>>>>>> A VM can communicate with another VM only if they are on the same >>>>>>>> VXLAN segment. >>>>>>>>> >>>>>>>>> the last sentence above is wrong. >>>>>>>>> >>>>>>>> GIM>> Section 4 in RFC 7348 states: >>>>>>>> Only VMs within the same VXLAN segment can communicate with each >>>>>>>> other. >>>>>>>> >>>>>>> >>>>>>> [ag] VMs on different segments can communicate using routing/IRB, so >>>>>>> even RFC 7348 is wrong. Perhaps the text should be modified so say -- "In >>>>>>> the absence of a router in the overlay, a VM can communicate...". >>>>>>> >>>>>>> >>>>>>>> >>>>>>>> Section 3: >>>>>>>>> >>> >>>>>>>>> Most deployments will have VMs with only L2 capabilities that >>>>>>>>> may not support L3. >>>>>>>>> >>> >>>>>>>>> Are you suggesting most deployments have VMs with no IP >>>>>>>>> addresses/configuration? >>>>>>>>> >>>>>>>> GIM>> Would re-word as follows: >>>>>>>> OLD TEXT: >>>>>>>> Most deployments will have VMs with only L2 capabilities that >>>>>>>> may not support L3. >>>>>>>> NEW TEXT: >>>>>>>> Deployments may have VMs with only L2 capabilities that do not >>>>>>>> support L3. >>>>>>>> >>>>>>> >>>>>>> [ag] I still don't understand this. What does it mean for a VM to >>>>>>> not support L3? No IP address, no default GW, something else? >>>>>>> >>>>>> GIM2>> VM communicates with its VTEP which, in turn, originates VXLAN >>>>>> tunnel. VM is not required to have IP address as it is VTEP's IP address >>>>>> that VM's MAC is associated with. As for gateway, RFC 7348 discusses VXLAN >>>>>> gateway as the device that forwards traffice between VXLAN and non-VXLAN >>>>>> domains. Considering all that, would the following change be acceptable: >>>>>> OLD TEXT: >>>>>> Most deployments will have VMs with only L2 capabilities that >>>>>> may not support L3. >>>>>> NEW TEXT: >>>>>> Most deployments will have VMs with only L2 capabilities and not >>>>>> have an IP address assigned. >>>>>> >>>>> >>>>> [ag2] Do you have a reference for this (i.e. that most deployments >>>>> have VMs without an IP address)? Normally I would think VMs would have an >>>>> IP address. It's just that they are segregated into segments and, without >>>>> an intervening router, they are restricted to communicate only within their >>>>> subnet. >>>>> >>>> GIM3>> Would the following text be acceptable: >>>> >>>> Deployments might have VMs with only L2 capabilities and not have an IP >>>> address assigned or, >>>> in other cases, VMs are assigned IP address but are restricted to >>>> communicate only within their subnet. >>>> >>>> >>> [ag3] Yes, this is better. >>> >>> >>>>>>> >>>>>>>> >>>>>>>>> >>> >>>>>>>>> Having a hierarchical OAM model helps localize faults though it >>>>>>>>> requires additional consideration. >>>>>>>>> >>> >>>>>>>>> What are the additional considerations? >>>>>>>>> >>>>>>>> GIM>> For example, coordination of BFD intervals across the OAM >>>>>>>> layers. >>>>>>>> >>>>>>> >>>>>>> [ag] Can we mention them in the draft? >>>>>>> >>>>>>> >>>>>>>> >>>>>>>>> Would be useful to add a reference to RFC 8293 in case the reader >>>>>>>>> would like to know more about service nodes. >>>>>>>>> >>>>>>>> GIM>> I have to admit that I don't find how RFC 8293 A Framework >>>>>>>> for Multicast in Network Virtualization over Layer 3 is related to this >>>>>>>> document. Please help with additional reference to the text of the >>>>>>>> document. >>>>>>>> >>>>>>> >>>>>>> [ag] The RFC discusses the use of service nodes which is mentioned >>>>>>> here. >>>>>>> >>>>>>> >>>>>>>> >>>>>>>>> Section 4 >>>>>>>>> >>> >>>>>>>>> Separate BFD sessions can be established between the VTEPs (IP1 >>>>>>>>> and IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200). >>>>>>>>> >>> >>>>>>>>> IMO, the document should mention that this could lead to scaling >>>>>>>>> issues given that VTEPs can support well in excess of 4K VNIs. >>>>>>>>> Additionally, we should mention that with IRB, a given VNI may not even >>>>>>>>> exist on the destination VTEP. Finally, what is the benefit of doing >>>>>>>>> this? There may be certain corner cases where it's useful (vs a single BFD >>>>>>>>> session between the VTEPs for all VNIs) but it would be good to explain >>>>>>>>> what those are. >>>>>>>>> >>>>>>>> GIM>> Will add text in the Security Considerations section that >>>>>>>> VTEPs should have limit on number of BFD sessions. >>>>>>>> >>>>>>> >>>>>>> [ag] I was hoping for two things: >>>>>>> - A mention about the scalability issue right where per-VNI BFD is >>>>>>> discussed. (Not sure why that is a security issue/consideration.) >>>>>>> >>>>>> GIM2>> I've added the following sentense in both places: >>>>>> The implementation SHOULD have a reasonable upper bound on the number >>>>>> of BFD sessions that can be created between the same pair of VTEPs. >>>>>> >>>>> >>>>> [ag2] What is the criteria for determining what is reasonable? >>>>> >>>> GIM>> I usually understand that as requirement to make it controllable, >>>> have configurable limit. Thus it will be up to an network operator to set >>>> the limit. >>>> >>>>> >>>>> >>>>>> - What is the benefit of running BFD per VNI between a pair of VTEPs? >>>>>>> >>>>>> GIM2>> An alternative would be to run CFM between VMs, if there's the >>>>>> need to monitor liveliness of the particular VM. Again, this is optional. >>>>>> >>>>> >>>>> [ag2] I'm not sure how running per-VNI BFD between the VTEPs allows >>>>> one to monitor the liveliness of VMs. >>>>> >>>> >>> [ag3] I think you missed responding to this. I'm not sure of the value >>> of running BFD per VNI between VTEPs. What am I getting that is not >>> covered by running a single BFD session with VNI 0 between the VTEPs? >>> >>> >>>> >>>>> >>>>>> >>>>>>> >>>>>>>> >>>>>>>>> Sections 5.1 and 6.1 >>>>>>>>> >>>>>>>>> In 5.1 we have >>>>>>>>> >>> >>>>>>>>> The inner MAC frame carrying the BFD payload has the >>>>>>>>> following format: >>>>>>>>> ... Source IP: IP address of the originating VTEP. Destination IP: >>>>>>>>> IP address of the terminating VTEP. >>>>>>>>> >>> >>>>>>>>> >>>>>>>>> In 6.1 we have >>>>>>>>> >>> >>>>>>>>> >>>>>>>>> Since multiple BFD sessions may be running between two >>>>>>>>> VTEPs, there needs to be a mechanism for demultiplexing received BF >>>>>>>>> >>>>>>>>> packets to the proper session. The procedure for demultiplexing >>>>>>>>> packets with Your Discriminator equal to 0 is different from[RFC5880 ]. >>>>>>>>> >>>>>>>>> *For such packets, the BFD session MUST be identified* >>>>>>>>> >>>>>>>>> *using the inner headers, i.e., the source IP and the destination IP >>>>>>>>> present in the IP header carried by the payload of the VXLAN* >>>>>>>>> >>>>>>>>> *encapsulated packet.* >>>>>>>>> >>>>>>>>> >>>>>>>>> >>> >>>>>>>>> How does this work if the source IP and dest IP are the same as >>>>>>>>> specified in 5.1? >>>>>>>>> >>>>>>>> GIM>> You're right, Destination and source IP addresses likely are >>>>>>>> the same in this case. Will add that the source UDP port number, along with >>>>>>>> the pair of IP addresses, MUST be used to demux received BFD control >>>>>>>> packets. Would you agree that will be sufficient? >>>>>>>> >>>>>>> >>>>>>> [ag] Yes, I think that should work. >>>>>>> >>>>>>>> >>>>>>>>> Editorial >>>>>>>>> >>>>>>>> >>>>>>> [ag] Agree with all comments on this section. >>>>>>> >>>>>>>> >>>>>>>>> - Terminology section should be renamed to acronyms. >>>>>>>>> >>>>>>>> GIM>> Accepted >>>>>>>> >>>>>>>>> - Document would benefit from a thorough editorial scrub, but >>>>>>>>> maybe that will happen once it gets to the RFC editor. >>>>>>>>> >>>>>>>> GIM>> Will certainly have helpful comments from ADs and RFC editor. >>>>>>>> >>>>>>>>> >>>>>>>>> Section 1 >>>>>>>>> >>> >>>>>>>>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348 >>>>>>>>> ]. provides an encapsulation >>>>>>>>> scheme that allows virtual machines (VMs) to communicate in a data center >>>>>>>>> network. >>>>>>>>> >>> >>>>>>>>> This is not accurate. VXLAN allows you to implement an overlay to >>>>>>>>> decouple the address space of the attached hosts from that of the network. >>>>>>>>> >>>>>>>> GIM>> Thank you for the suggested text. Will change as follows: >>>>>>>> OLD TEXT: >>>>>>>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. >>>>>>>> provides >>>>>>>> an encapsulation scheme that allows virtual machines (VMs) to >>>>>>>> communicate in a data center network. >>>>>>>> NEW TEXT: >>>>>>>> "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]. >>>>>>>> provides >>>>>>>> an encapsulation scheme that allows building an overlay network >>>>>>>> by >>>>>>>> decoupling the address space of the attached virtual hosts from >>>>>>>> that of the network. >>>>>>>> >>>>>>>>> >>>>>>>>> Section 7 >>>>>>>>> >>>>>>>>> VTEP's -> VTEPs >>>>>>>>> >>>>>>>> GIM>> Yes, thank you. >>>>>>>> >>>>>>> --0000000000007201be057b46b469 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Anoop,
apologies if my explanation= was not clear. Non-zero VNIs are recommended to be used by a VTEP that rec= eived BFD control packet with zero Your Discriminator value. BFD control pa= ckets with non-zero Your Discriminator value will be demultiplexed using on= ly that value. As for the special role of VNI 0 the section 7 of the draft = states the following:
=C2=A0 =C2=A0BFD session MAY be establ= ished for the reserved VNI 0.=C2=A0 One way to
=C2=A0 =C2=A0aggre= gate BFD sessions between VTEP's is to establish a BFD session
=C2=A0 =C2=A0with VNI 0.=C2=A0 A VTEP MAY also use VNI 0 to establish a B= FD session
=C2=A0 =C2=A0with a service node.
Woul= d you suggest changing the normative language in this text?

<= /div>
Regards,
Greg

PS. Happy Thanks= giving to All!

On Wed, Nov 21, 2018 at 11:00 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Hi Greg,

See b= elow prefixed with [ag4].

Thanks,
Anoop<= /div>
On Wed, Nov 21, 2018 a= t 4:36 PM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop,
apologies for= the miss. Is it the last outstanding? Let's bring it to the front then= .

- What is the benefit of running BFD per VNI between a p= air of VTEPs?
GIM2>> An alte= rnative would be to run CFM between VMs, if there's the need to monitor= liveliness of the particular VM. Again, this is optional.=C2=A0

[ag2] I'm not sure how ru= nning per-VNI BFD between the VTEPs allows one to monitor the liveliness of= VMs.=C2=A0

[ag3] I think you missed responding to this.= =C2=A0 I'm not sure of the value of running BFD per VNI between VTEPs.= =C2=A0 What am I getting that is not covered by running a single BFD sessio= n with VNI 0 between the VTEPs?
=C2=A0
GIM3>&g= t; I've misspoken. Non-zero VNI is recommended to be used to demultiple= x BFD sessions between the same VTEPs. In section 6.1:
=C2= =A0 =C2=A0The procedure for demultiplexing
=C2=A0 =C2=A0packets w= ith Your Discriminator equal to 0 is different from
=C2=A0 =C2=A0= [RFC5880].=C2=A0 For such packets, the BFD session MUST be identified
=
=C2=A0 =C2=A0using the inner headers, i.e., the source IP and the dest= ination IP
=C2=A0 =C2=A0present in the IP header carried by the p= ayload of the VXLAN
=C2=A0 =C2=A0encapsulated packet.=C2=A0 The V= NI of the packet SHOULD be used to derive
=C2=A0 =C2=A0interface-= related information for demultiplexing the packet.

Hope that clarifies the use of non-zero VNI in VXLAN encapsulation o= f a BFD control packet.

[= ag4] This tells me how the VNI is used for BFD packets being sent/received.= =C2=A0 What is the use case/benefit of doing that?=C2=A0 I am creating a sp= ecial interface with VNI 0 just for BFD.=C2=A0 Why do I now need to run BFD= on any/all of the other VNIs?=C2=A0 As a developer, if I read this spec, s= hould I be building this capability or not?=C2=A0 Basically what I'm ge= tting at is I think the draft should recommend using VNI 0.=C2=A0 If there = is a convincing use case for running BFD over other VNIs serviced by that V= TEP, then that needs to be explained.=C2=A0 But as I mentioned before, this= leads to scaling issues.=C2=A0 So given the scaling issues, it would be go= od if an implementation only needed to worry about sending BFD messages on = VNI 0.
=C2=A0

Regards,
Greg

On Tue, Nov 20, 2018 at 12:14 PM A= noop Ghanwani <anoop@alumni.duke.edu> wrote:
Hi Greg,

Please = see inline prefixed by [ag3].

Thanks,
An= oop

On Fri, Nov 1= 6, 2018 at 5:29 PM Greg Mirsky <gregimirsky@gmail.com> wrote:
H= i Anoop,
thank you for the discussion. Please find my responses tagged = GIM3>>. Also, attached diff and the updated working version of the dr= aft. Hope we're converging.

Regards,
Greg

On Wed, Nov 14, = 2018 at 11:00 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Hi Greg,

=
Please see inline prefixed with [ag2].

= Thanks,
Anoop

=
On Wed, Nov 14, 2018 at 9:45 AM Greg Mirsky <gregimirsky@gmail.com&= gt; wrote:
Hi Anoop,
thank you for the expedient=C2= =A0response. I am glad that some=C2=A0of my responses have addressed your c= oncerns. Please find followup notes in-line tagged GIM2>>. I've a= ttached the diff to highlight the updates applied in the working version. L= et me know if these are acceptable changes.

Regard= s,
Greg

On T= ue, Nov 13, 2018 at 12:30 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Hi Gr= eg,

Please see inline prefixed with [ag].

=
Thanks,
Anoop

On Tue, Nov 13, 2018 at 11:34 AM Greg Mirsky <gregimirsky@gmail.com> w= rote:
Hi Anoop,
many thanks for the thorough rev= iew and detailed comments. Please find my answers, this time for real, in-l= ine tagged GIM>>.

Regards,
Greg
On Thu, Nov 8, 2018 at 1= :58 AM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:

Here are my comm= ents.

Thanks,
Anoop

=
=3D=3D

Philosophical

Since VXLAN is not an IETF standard, should we be defining a standard for = running BFD on it?=C2=A0 Should we define BFD over Geneve instead which is = the official WG selection?=C2=A0 Is that going to be a separate document?
GIM>> IS-IS is not on the Standard track eit= her but that had not prevented IETF from developing tens of standard track = RFCs using RFC 1142 as the normative reference until RFC 7142 re-classified= it as historical. A similar path was followed with IS-IS-TE by publishing = RFC 3784 until it was obsoleted by RFC 5305 four years later. I understand = that Down Reference, i.e., using informational RFC as the normative referen= ce, is not an unusual situation.

[ag] OK.=C2=A0 I'm not an expert on this part= so unless someone else that is an expert (chairs, AD?) can comment on it, = I'll just let it go.
=C2=A0
=C2=A0

Technical

Section 1:

This part needs to be rewritten:
=
>>>
The individual racks may be part of a different Layer 3 network, or they could be in a single Layer 2 network. The VXLAN segments/overlays are overlaid on top of Layer 3 network. A VM can communicate with another VM only if they are on the same VXLAN segment.
>>>
It's hard t= o parse and, given IRB,
GIM>> Would the= following text be acceptable:
OLD TEXT:
=C2=A0 = =C2=A0VXLAN is typically deployed in data centers interconnecting
=C2=A0 =C2=A0virtualized hosts, which may be spread across multiple racks.= =C2=A0 The
=C2=A0 =C2=A0individual racks may be part of a differe= nt Layer 3 network, or they
=C2=A0 =C2=A0could be in a single Lay= er 2 network.=C2=A0 The VXLAN segments/overlays
=C2=A0 =C2=A0are = overlaid on top of Layer 3 network.
NEW TEXT:
VXLAN is typically deployed in data centers interconnect= ing virtualized=C2=A0
hosts of a tenant. VX= LAN addresses requirements of the Layer 2 and=C2=A0
Layer 3 data center network infrastructure in the presence of VMs = in=C2=A0
a multi-tenant environment, discus= sed in section 3 [RFC7348], by
=C2=A0provid= ing Layer 2 overlay scheme on a Layer 3 network.

[ag] This is a lot better.
=C2=A0

=C2=A0A VM can communicate with another VM only if they are on th= e same
VXLAN segment.
the last sentenc= e above is wrong.
GIM>> Section 4 in RFC= 7348 states:
Only VMs within the same VXLAN segment can communic= ate with=C2=A0each other.

[ag] VMs o= n different segments can communicate using routing/IRB, so even RFC 7348 is= wrong.=C2=A0 Perhaps the text should be modified so say -- "In the ab= sence of a router in the overlay, a VM can communicate...".
= =C2=A0
<= div>Section 3:
>>>
=C2=A0= Most deployments will have VMs with only L2 capabilities that
<= span style=3D"color:rgb(0,0,0);font-family:monospace;font-size:13.3333px;wh= ite-space:pre-wrap">may not support L3.
>>>
A= re you suggesting most deployments have VMs with no IP addresses/configurat= ion?
GIM>> Would re-word as follows:
OLD TEXT:
=C2=A0Most deployments will have VMs with only L= 2 capabilities that
=C2=A0may not support L3.
NEW TEXT:=
Deployments may have VMs with only L2 capabilities that do not s= upport L3.=C2=A0
=
<= div dir=3D"ltr">

[ag] I still don't understand this.=C2=A0 What does it mean fo= r a VM to not support L3?=C2=A0 No IP address, no default GW, something els= e?
GIM2>> VM communicates wi= th its VTEP which, in turn, originates VXLAN tunnel. VM is not required to = have IP address as it is VTEP's IP address that VM's MAC is associa= ted with. As for gateway, RFC 7348 discusses VXLAN gateway as the device th= at forwards traffice between VXLAN and non-VXLAN domains. Considering all t= hat, would the following change be acceptable:
OLD TEXT:
=C2=A0Most deployments will have VMs with only L2 capabilities that<= /div>
=C2=A0may not support L3.
NEW TEXT:
=C2=A0Most deployments will have VMs with only L2 capabilities and not ha= ve an IP address assigned.
<= br>
[ag2] Do you have a reference for this (i.e. that most deploy= ments have VMs without an IP address)?=C2=A0 Normally I would think VMs wou= ld have an IP address.=C2=A0 It's just that they are segregated into se= gments and, without an intervening router, they are restricted to communica= te only within their subnet.
GIM3>> Would the following text be acceptable:
Deployments might have VMs with only L2 capabil= ities and not have an IP address assigned or,
in other cases, VMs are assigned IP address but ar= e restricted to communicate only within their subnet.=C2=A0=C2=A0

[ag3] Yes, this= is better.

=C2=A0
<= div dir=3D"ltr">

>>>
Having= a hierarchical OAM model helps localize faults though it requires additional consideration.
&g= t;>>
What are the additional considerations?
GIM>> For example, coordinat= ion of BFD intervals across the OAM layers.=C2=A0=C2=A0
<= /div>

[ag] Can we mention them in the draft?
=C2= =A0

Would be useful= to add a reference to RFC 8293 in case the reader would like to know more = about service nodes.
= GIM>> I have to admit that I don't find how RFC 8293=C2=A0=C2=A0A= Framework for Multicast in Network Virtualization over Layer 3 is related = to this document. Please help with additional reference to the text of the = document.=C2=A0=C2=A0

[ag] The RF= C discusses the use of service nodes which is mentioned here.=C2=A0=C2=A0
=C2=A0
<= div dir=3D"ltr">

Sec= tion 4
>>>
Separate BFD sessions can be established between the VTEPs (IP1 and IP2) for monitoring each of the VXLAN tunnels (VNI 100 and 200).
>>>
IMO, the document should mention that this could l= ead to scaling issues given that VTEPs can support well in excess of 4K VNI= s.=C2=A0 Additionally, we should mention that with IRB, a given VNI may not= even exist on the destination VTEP.=C2=A0 Finally, what is the benefit of = doing this?=C2=A0 There may be certain corner cases where it's useful (= vs a single BFD session between the VTEPs for all VNIs) but it would be goo= d to explain what those are.
GIM>> Will add text in the Security Considerations section th= at VTEPs should have limit on number of BFD sessions.=C2=A0

[ag] I was hoping for two things:
- A = mention about the scalability issue right where per-VNI BFD is discussed.= =C2=A0 (Not sure why that is a security issue/consideration.)
GIM2>> I've added the following sente= nse in both places:
The implementation SHOULD have a reasonable u= pper bound on the number of BFD sessions that can be created between the sa= me pair of VTEPs.=C2=A0

=
[ag2] What is the criteria for determining what is reasonable?
GIM>> I usually understand th= at as requirement to make it controllable, have configurable limit. Thus it= will be up to an network operator to set the limit.=C2=A0
=C2=A0
=
- What is the benefit of running BFD p= er VNI between a pair of VTEPs?
GI= M2>> An alternative would be to run CFM between VMs, if there's t= he need to monitor liveliness of the particular VM. Again, this is optional= .=C2=A0

[ag2] I'= ;m not sure how running per-VNI BFD between the VTEPs allows one to monitor= the liveliness of VMs.=C2=A0

[ag3] I think you missed re= sponding to this.=C2=A0 I'm not sure of the value of running BFD per VN= I between VTEPs.=C2=A0 What am I getting that is not covered by running a s= ingle BFD session with VNI 0 between the VTEPs?
=C2=A0
=C2=A0
<= div>=C2=A0

Secti= ons 5.1 and 6.1

In 5.1 we have
>>&= gt;
The inner MAC frame carrying the BFD pay= load has the
following format:
... Source IP: IP address of the originating VTEP. Destination IP: IP address of the terminating VTEP.
&= gt;>>

In 6.1 we have=C2=A0
>>= ;>
Since multiple BFD sessions=
 may be running between two
VTEPs, there needs to be a mechanism for demultiplexing received BF
packets to the proper session. The procedure= for demultiplexing packets with Your Discriminator equal to 0 is different from[RFC5880].
For such packets, the BFD session MUST be i= dentified
using the =
inner headers, i.e., the source IP and the destination IP
present in the IP header carried by the payload of the VXLAN
encapsulated packet.
>>>
How does this work if the source IP and = dest IP are the same as specified in 5.1?
GIM&= gt;> You're right, Destination and source IP addresses likely are th= e same in this case. Will add that the source UDP port number, along with t= he pair of IP addresses, MUST be used to demux received BFD control packets= . Would you agree that will be sufficient?=C2=A0

[ag] Yes, I think that should work.=C2=A0

Editorial
<= /div>

[ag] Agree with all comments on this section.=C2=A0<= /div>

- Terminology sec= tion should be renamed to acronyms.
GIM>>= ; Accepted=C2=A0
- Document would benefit from a thorough editorial scrub= , but maybe that will happen once it gets to the RFC editor.
GIM>> Will certainly have helpful comments from ADs an= d RFC editor.

Section 1
>>>
<= span style=3D"color:rgb(0,0,0);font-family:monospace;font-size:13.3333px;wh= ite-space:pre-wrap">"Virtual eXtensible Local Area Network" (VXLA= N) [RFC= 7348]. provides an encapsulation scheme that allows virtual machines (VMs) to communicate in a data center network.
>>>
This is not accurate.=C2=A0 VXLAN allows you to implement an overlay= to decouple the address space of the attached hosts from that of the netwo= rk.
GIM>> Thank you for the suggested te= xt. Will change as follows:
OLD TEXT:
=C2=A0 =C2=A0&quo= t;Virtual eXtensible Local Area Network" (VXLAN) [RFC7348].=C2=A0 prov= ides
=C2=A0 =C2=A0an encapsulation scheme that allows virtual mac= hines (VMs) to
=C2=A0 =C2=A0communicate in a data center network.= =C2=A0
NEW TEXT:
=C2=A0"Virtual eXtensible Lo= cal Area Network" (VXLAN) [RFC7348].=C2=A0 provides
=C2=A0 = =C2=A0an encapsulation scheme that allows building an overlay network by=C2= =A0
=C2=A0 decoupling the address space of the attached virtual h= osts from that of the network.

Section 7
<= br>
VTEP's -> VTEPs
GIM>> Yes, thank you.=C2=A0
--0000000000007201be057b46b469-- From nobody Fri Nov 23 10:47:46 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8EE2B129C6A; Fri, 23 Nov 2018 10:47:39 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.649 X-Spam-Level: X-Spam-Status: No, score=-1.649 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.25, 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] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Mu015y32aK4W; Fri, 23 Nov 2018 10:47:37 -0800 (PST) Received: from mail-ua1-f50.google.com (mail-ua1-f50.google.com [209.85.222.50]) (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 95BC21288EB; Fri, 23 Nov 2018 10:47:37 -0800 (PST) Received: by mail-ua1-f50.google.com with SMTP id u19so4378120uae.4; Fri, 23 Nov 2018 10:47:37 -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=Xoh0WGkQxyiYyyeciVxfVL88e3w3h/ub3ftpMz9Sric=; b=gZkZKRu+K1J0k7/jkkLYN3WN0jgA1TUCm4qOEFGIGtDbwubNLK71fgVRVH7HzOrYJV lZsc0olHy+OXcIcIxirjoPtWbM8RWueIgSIU2UBOIU8YbBI7v9YH+O3NqTU/vLcS3mxA Nd+L27BzKMtZdqJJKtMC3V5udqP7GS7dEfBWk1kPbxAWYHiuu0luymPvUH/WEwfzoOQr +PU7NC3FM9Lr/N4uQj9MfepLSG31VaxGr/MNmheYyUedrZ9OEJdFynojD89jxZuLjmg/ bF+JQblGYsVpdEikXJ3VbLP6TTTRbE18Durqfm9lGG+fWCKU5biThTqeHOlMGNMUY4oS zxPQ== X-Gm-Message-State: AA+aEWbpqitgbO7JVTwWw8JG+TO+YQTznDS9CFazvfQsVliIjndF2NPu sN8LOKfepQw8Ls8dCdffpI5rXgpOvnbtvCs8zpE= X-Google-Smtp-Source: AFSGD/VpLls1kwphVSWsRSfWvIWlMQOgiXkl5lq5Zc4pafN/lpaFofUDIgdYpHc/YfQA8bB747htWbWZTeDf/l/Bybo= X-Received: by 2002:ab0:8d9:: with SMTP id o25mr7315388uaf.127.1542998856469; Fri, 23 Nov 2018 10:47:36 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Anoop Ghanwani Date: Fri, 23 Nov 2018 10:47:23 -0800 Message-ID: Subject: Re: WGLC comments on draft-ietf-bfd-vxlan To: Greg Mirsky Cc: rtg-bfd@ietf.org, nvo3@ietf.org Content-Type: multipart/alternative; boundary="000000000000ba94b2057b596a93" Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Nov 2018 18:47:40 -0000 --000000000000ba94b2057b596a93 Content-Type: text/plain; charset="UTF-8" Hi Greg, I would recommend the following change. OLD 7. Use of reserved VNI BFD session MAY be established for the reserved VNI 0. One way to aggregate BFD sessions between VTEP's is to establish a BFD session with VNI 0. A VTEP MAY also use VNI 0 to establish a BFD session with a service node. NEW 7. Use of reserved VNI In most cases, only a single BFD session is necessary for a given VTEP to monitor the reachability to a remote VTEP, regardless of the number of VNIs in common. When a single session is used to monitor reachability remote VTEP, an implementation SHOULD use a VNI of 0. Thanks, Anoop On Thu, Nov 22, 2018 at 12:28 PM Greg Mirsky wrote: > Hi Anoop, > apologies if my explanation was not clear. Non-zero VNIs are recommended > to be used by a VTEP that received BFD control packet with zero Your > Discriminator value. BFD control packets with non-zero Your Discriminator > value will be demultiplexed using only that value. As for the special role > of VNI 0 the section 7 of the draft states the following: > BFD session MAY be established for the reserved VNI 0. One way to > aggregate BFD sessions between VTEP's is to establish a BFD session > with VNI 0. A VTEP MAY also use VNI 0 to establish a BFD session > with a service node. > Would you suggest changing the normative language in this text? > > Regards, > Greg > > PS. Happy Thanksgiving to All! > > On Wed, Nov 21, 2018 at 11:00 PM Anoop Ghanwani > wrote: > >> Hi Greg, >> >> See below prefixed with [ag4]. >> >> Thanks, >> Anoop >> >> On Wed, Nov 21, 2018 at 4:36 PM Greg Mirsky >> wrote: >> >>> Hi Anoop, >>> apologies for the miss. Is it the last outstanding? Let's bring it to >>> the front then. >>> >>> - What is the benefit of running BFD per VNI between a pair of VTEPs? >>>>>>> >>>>>> GIM2>> An alternative would be to run CFM between VMs, if there's the >>>>>> need to monitor liveliness of the particular VM. Again, this is optional. >>>>>> >>>>> >>>>> [ag2] I'm not sure how running per-VNI BFD between the VTEPs allows >>>>> one to monitor the liveliness of VMs. >>>>> >>>> >>> [ag3] I think you missed responding to this. I'm not sure of the value >>> of running BFD per VNI between VTEPs. What am I getting that is not >>> covered by running a single BFD session with VNI 0 between the VTEPs? >>> >>> GIM3>> I've misspoken. Non-zero VNI is recommended to be used to >>> demultiplex BFD sessions between the same VTEPs. In section 6.1: >>> The procedure for demultiplexing >>> packets with Your Discriminator equal to 0 is different from >>> [RFC5880]. For such packets, the BFD session MUST be identified >>> using the inner headers, i.e., the source IP and the destination IP >>> present in the IP header carried by the payload of the VXLAN >>> encapsulated packet. The VNI of the packet SHOULD be used to derive >>> interface-related information for demultiplexing the packet. >>> >>> Hope that clarifies the use of non-zero VNI in VXLAN encapsulation of a >>> BFD control packet. >>> >> >> [ag4] This tells me how the VNI is used for BFD packets being >> sent/received. What is the use case/benefit of doing that? I am creating >> a special interface with VNI 0 just for BFD. Why do I now need to run BFD >> on any/all of the other VNIs? As a developer, if I read this spec, should >> I be building this capability or not? Basically what I'm getting at is I >> think the draft should recommend using VNI 0. If there is a convincing use >> case for running BFD over other VNIs serviced by that VTEP, then that needs >> to be explained. But as I mentioned before, this leads to scaling issues. >> So given the scaling issues, it would be good if an implementation only >> needed to worry about sending BFD messages on VNI 0. >> >> >>> >>> Regards, >>> Greg >>> >>>> --000000000000ba94b2057b596a93 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Greg,

I would recommend the followin= g change.

OLD

7.=C2=A0 Use of = reserved VNI

=C2=A0 =C2=A0BFD session MAY be established for the res= erved VNI 0.=C2=A0 One way to
=C2=A0 =C2=A0aggregate BFD sessions betwee= n VTEP's is to establish a BFD session
=C2=A0 =C2=A0with VNI 0.=C2= =A0 A VTEP MAY also use VNI 0 to establish a BFD session
=C2=A0 =C2=A0wi= th a service node.

NEW

7.=C2=A0 Use of reserved VNI

= =C2=A0 =C2=A0In most cases, only a single BFD session is necessary for a gi= ven VTEP to monitor the reachability to a remote VTEP, regardless of the nu= mber of VNIs in common.=C2=A0 When a single session is used to monitor reac= hability remote VTEP, an implementation SHOULD use a VNI of 0.=C2=A0=C2=A0<= div>
Thanks,
Anoop

On Thu, Nov 22, 2018 at 12:28 PM Greg Mirsky= <gregimirsky@gmail.com>= wrote:
Hi Anoop,
apologies if my explanation was not clear. Non-zero = VNIs are recommended to be used by a VTEP that received BFD control packet = with zero Your Discriminator value. BFD control packets with non-zero Your = Discriminator value will be demultiplexed using only that value. As for the= special role of VNI 0 the section 7 of the draft states the following:
=C2=A0 =C2=A0BFD session MAY be established for the reserved VN= I 0.=C2=A0 One way to
=C2=A0 =C2=A0aggregate BFD sessions between= VTEP's is to establish a BFD session
=C2=A0 =C2=A0with VNI 0= .=C2=A0 A VTEP MAY also use VNI 0 to establish a BFD session
=C2= =A0 =C2=A0with a service node.
Would you suggest changing t= he normative language in this text?

Regards,
=
Greg

PS. Happy Thanksgiving to All!

On Wed, Nov 21, 201= 8 at 11:00 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Hi Greg,

See below p= refixed with [ag4].

Thanks,
Anoop
<= br>
On Wed, Nov 21, 2018 at 4:36= PM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop,
apologies for the mis= s. Is it the last outstanding? Let's bring it to the front then.
<= div>
- What is the benefit of running BFD per VNI between a pair of = VTEPs?
GIM2>> An alternative= would be to run CFM between VMs, if there's the need to monitor liveli= ness of the particular VM. Again, this is optional.=C2=A0
=

[ag2] I'm not sure how running p= er-VNI BFD between the VTEPs allows one to monitor the liveliness of VMs.= =C2=A0

[ag3] I think you missed responding to this.=C2=A0= I'm not sure of the value of running BFD per VNI between VTEPs.=C2=A0 = What am I getting that is not covered by running a single BFD session with = VNI 0 between the VTEPs?
=C2=A0
GIM3>> I= 9;ve misspoken. Non-zero VNI is recommended to be used to demultiplex BFD s= essions between the same VTEPs. In section 6.1:
=C2=A0 =C2= =A0The procedure for demultiplexing
=C2=A0 =C2=A0packets with You= r Discriminator equal to 0 is different from
=C2=A0 =C2=A0[RFC588= 0].=C2=A0 For such packets, the BFD session MUST be identified
= =C2=A0 =C2=A0using the inner headers, i.e., the source IP and the destinati= on IP
=C2=A0 =C2=A0present in the IP header carried by the payloa= d of the VXLAN
=C2=A0 =C2=A0encapsulated packet.=C2=A0 The VNI of= the packet SHOULD be used to derive
=C2=A0 =C2=A0interface-relat= ed information for demultiplexing the packet.

Hope that clarifies the use of non-zero VNI in VXLAN encapsulation of a B= FD control packet.

[ag4] = This tells me how the VNI is used for BFD packets being sent/received.=C2= =A0 What is the use case/benefit of doing that?=C2=A0 I am creating a speci= al interface with VNI 0 just for BFD.=C2=A0 Why do I now need to run BFD on= any/all of the other VNIs?=C2=A0 As a developer, if I read this spec, shou= ld I be building this capability or not?=C2=A0 Basically what I'm getti= ng at is I think the draft should recommend using VNI 0.=C2=A0 If there is = a convincing use case for running BFD over other VNIs serviced by that VTEP= , then that needs to be explained.=C2=A0 But as I mentioned before, this le= ads to scaling issues.=C2=A0 So given the scaling issues, it would be good = if an implementation only needed to worry about sending BFD messages on VNI= 0.
=C2=A0
<= div dir=3D"ltr">

Regards,
Greg
<= div dir=3D"ltr">
--000000000000ba94b2057b596a93-- From nobody Fri Nov 23 13:10:33 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0522C127133; Fri, 23 Nov 2018 13:10:32 -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 RH1oKoeBctIj; Fri, 23 Nov 2018 13:10:30 -0800 (PST) Received: from mail-lf1-x136.google.com (mail-lf1-x136.google.com [IPv6:2a00:1450:4864:20::136]) (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 87B3C12426A; Fri, 23 Nov 2018 13:10:29 -0800 (PST) Received: by mail-lf1-x136.google.com with SMTP id v5so9492783lfe.7; Fri, 23 Nov 2018 13:10:29 -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=C1nzAP0bSyJijoHg9YkYcMfH1gaoeg+hsXTQ6DHUE2M=; b=YVQp3utLFfUix2G5AxzqjcASDuh9fghRsbaBWQhUyQA7jnKM91/C0weEQrFo3MJYlW m28yEnNWKNE+mMSNOpxnPVIwllwiFRRysH9cETF7knESeiG5Jz+Dk3zM1i+E3rYJMWKK Sao+F2stsvBvT0si6nrWXV76YQWNhLm1rxQqJQu29kn6TiaV3OVfBIbcDqMELf9nDrGs HkCWjny95u7lRDqV04OBjfHqk3SCrYWLxaZqhsdhN7Neb4Fxh/foVf/EyfUNlrraG29i IN39xUdo6znaY35Igel02JsKOFecL23YZ/ge21ZB8VYncSzn0rtjk3uUCEAVE9RS9bqS nSWw== 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=C1nzAP0bSyJijoHg9YkYcMfH1gaoeg+hsXTQ6DHUE2M=; b=B3ceCuAQtWmgux0R53UYkNd3BTmGHPtEeRab8L1H2YvXbD/8XpXtEbRLxsku3wIlWi ez1CBoxmh/UncWqzcEWtH9jfls0g1wm4gwy9vBpqa5TZp/n/Gi51JeY0ysUt0yxTUmtw hwhBS5FAQdy1tSMxWZvBWMXmj8WBLXFcOPvJoH97b/FRgXS3FKYZl2OsHcRy6Og5pElD lpEll5Xgr0nhoRfezrqVOWN0hMYlR4opQKz/HBM8nAYAAIiXSPwic4F8IiSsMd2hyfOT eUtnTpTJtw4zABfjI5LPFuSfmnu8i3Gz8DKIOXUvW6mJU52Ve+cutSJkRhACrZW0P0EW ETBQ== X-Gm-Message-State: AGRZ1gLZivW4CvAAJmSU6+Z9jNJLrtQSXCTbMnvhlrFr9gyK1unut2qa GiwszXGPWtxJlwa2ZxkOKjO4JYUXjor3FxQinjs= X-Google-Smtp-Source: AJdET5f+dRak3YqUF5EGovLIvIdwu5jmU7EH7tK5YvFJ2bK2DdLT66eK/eSVdHPpGAXfJkjBTF/4znRdCFd75GvfbV8= X-Received: by 2002:a19:26ce:: with SMTP id m197mr9914818lfm.23.1543007427433; Fri, 23 Nov 2018 13:10:27 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Greg Mirsky Date: Fri, 23 Nov 2018 13:10:16 -0800 Message-ID: Subject: Re: WGLC comments on draft-ietf-bfd-vxlan To: Anoop Ghanwani Cc: rtg-bfd WG , NVO3 Content-Type: multipart/alternative; boundary="000000000000991b78057b5b6953" Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Nov 2018 21:10:32 -0000 --000000000000991b78057b5b6953 Content-Type: text/plain; charset="UTF-8" Hi Anoop, thank you for the consise text. I think I've got the idea. Would the minor tweak be acceptable? In most cases, a single BFD session is sufficient for the given VTEP to monitor the reachability of a remote VTEP, regardless of the number of VNIs in common. When the single BFD session is used to monitor reachability of the remote VTEP, an implementation SHOULD use a VNI of 0. Regards, Greg On Fri, Nov 23, 2018 at 10:47 AM Anoop Ghanwani wrote: > Hi Greg, > > I would recommend the following change. > > OLD > > 7. Use of reserved VNI > > BFD session MAY be established for the reserved VNI 0. One way to > aggregate BFD sessions between VTEP's is to establish a BFD session > with VNI 0. A VTEP MAY also use VNI 0 to establish a BFD session > with a service node. > > NEW > > 7. Use of reserved VNI > > In most cases, only a single BFD session is necessary for a given VTEP > to monitor the reachability to a remote VTEP, regardless of the number of > VNIs in common. When a single session is used to monitor reachability > remote VTEP, an implementation SHOULD use a VNI of 0. > > Thanks, > Anoop > > On Thu, Nov 22, 2018 at 12:28 PM Greg Mirsky > wrote: > >> Hi Anoop, >> apologies if my explanation was not clear. Non-zero VNIs are recommended >> to be used by a VTEP that received BFD control packet with zero Your >> Discriminator value. BFD control packets with non-zero Your Discriminator >> value will be demultiplexed using only that value. As for the special role >> of VNI 0 the section 7 of the draft states the following: >> BFD session MAY be established for the reserved VNI 0. One way to >> aggregate BFD sessions between VTEP's is to establish a BFD session >> with VNI 0. A VTEP MAY also use VNI 0 to establish a BFD session >> with a service node. >> Would you suggest changing the normative language in this text? >> >> Regards, >> Greg >> >> PS. Happy Thanksgiving to All! >> >> On Wed, Nov 21, 2018 at 11:00 PM Anoop Ghanwani >> wrote: >> >>> Hi Greg, >>> >>> See below prefixed with [ag4]. >>> >>> Thanks, >>> Anoop >>> >>> On Wed, Nov 21, 2018 at 4:36 PM Greg Mirsky >>> wrote: >>> >>>> Hi Anoop, >>>> apologies for the miss. Is it the last outstanding? Let's bring it to >>>> the front then. >>>> >>>> - What is the benefit of running BFD per VNI between a pair of VTEPs? >>>>>>>> >>>>>>> GIM2>> An alternative would be to run CFM between VMs, if there's >>>>>>> the need to monitor liveliness of the particular VM. Again, this is >>>>>>> optional. >>>>>>> >>>>>> >>>>>> [ag2] I'm not sure how running per-VNI BFD between the VTEPs allows >>>>>> one to monitor the liveliness of VMs. >>>>>> >>>>> >>>> [ag3] I think you missed responding to this. I'm not sure of the value >>>> of running BFD per VNI between VTEPs. What am I getting that is not >>>> covered by running a single BFD session with VNI 0 between the VTEPs? >>>> >>>> GIM3>> I've misspoken. Non-zero VNI is recommended to be used to >>>> demultiplex BFD sessions between the same VTEPs. In section 6.1: >>>> The procedure for demultiplexing >>>> packets with Your Discriminator equal to 0 is different from >>>> [RFC5880]. For such packets, the BFD session MUST be identified >>>> using the inner headers, i.e., the source IP and the destination IP >>>> present in the IP header carried by the payload of the VXLAN >>>> encapsulated packet. The VNI of the packet SHOULD be used to derive >>>> interface-related information for demultiplexing the packet. >>>> >>>> Hope that clarifies the use of non-zero VNI in VXLAN encapsulation of a >>>> BFD control packet. >>>> >>> >>> [ag4] This tells me how the VNI is used for BFD packets being >>> sent/received. What is the use case/benefit of doing that? I am creating >>> a special interface with VNI 0 just for BFD. Why do I now need to run BFD >>> on any/all of the other VNIs? As a developer, if I read this spec, should >>> I be building this capability or not? Basically what I'm getting at is I >>> think the draft should recommend using VNI 0. If there is a convincing use >>> case for running BFD over other VNIs serviced by that VTEP, then that needs >>> to be explained. But as I mentioned before, this leads to scaling issues. >>> So given the scaling issues, it would be good if an implementation only >>> needed to worry about sending BFD messages on VNI 0. >>> >>> >>>> >>>> Regards, >>>> Greg >>>> >>>>> --000000000000991b78057b5b6953 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Anoop,
thank you for the consise t= ext. I think I've got the idea. Would the minor tweak be acceptable?

In most cases, a single BFD session is sufficient for the give= n VTEP to monitor
the reachability of a remote VTEP, regardless of the n= umber of VNIs in common.
When the single BFD session is used to monitor = reachability of the remote VTEP,
an implementation SHOULD use a VNI of = 0.=C2=A0=C2=A0

Regards,
Greg

<= div class=3D"gmail_quote">
On Fri, Nov 23, 2018 at 10:47 AM= Anoop Ghanwani <anoop@alumni.d= uke.edu> wrote:
Hi Greg,

I would recommend the following change.

OLD

7.=C2=A0 Use of reserved VNI=

=C2=A0 =C2=A0BFD session MAY be established for the reserved VNI 0.= =C2=A0 One way to
=C2=A0 =C2=A0aggregate BFD sessions between VTEP's= is to establish a BFD session
=C2=A0 =C2=A0with VNI 0.=C2=A0 A VTEP MAY= also use VNI 0 to establish a BFD session
=C2=A0 =C2=A0with a service n= ode.

NEW

7.=C2=A0 Use of reserved VNI

=C2=A0 =C2=A0In = most cases, only a single BFD session is necessary for a given VTEP to moni= tor the reachability to a remote VTEP, regardless of the number of VNIs in = common.=C2=A0 When a single session is used to monitor reachability remote = VTEP, an implementation SHOULD use a VNI of 0.=C2=A0=C2=A0

Thanks,
Anoop

On Thu, Nov 22, 2018 at 12:28 PM Greg Mirsky <gregimirsky@gmail.com&g= t; wrote:
Hi Anoop,
apologies if my explanation was not clear. Non-zero = VNIs are recommended to be used by a VTEP that received BFD control packet = with zero Your Discriminator value. BFD control packets with non-zero Your = Discriminator value will be demultiplexed using only that value. As for the= special role of VNI 0 the section 7 of the draft states the following:
=C2=A0 =C2=A0BFD session MAY be established for the reserved VN= I 0.=C2=A0 One way to
=C2=A0 =C2=A0aggregate BFD sessions between= VTEP's is to establish a BFD session
=C2=A0 =C2=A0with VNI 0= .=C2=A0 A VTEP MAY also use VNI 0 to establish a BFD session
=C2= =A0 =C2=A0with a service node.
Would you suggest changing t= he normative language in this text?

Regards,
=
Greg

PS. Happy Thanksgiving to All!

On Wed, Nov 21, 201= 8 at 11:00 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Hi Greg,

See below p= refixed with [ag4].

Thanks,
Anoop
<= br>
On Wed, Nov 21, 2018 at 4:36= PM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop,
apologies for the mis= s. Is it the last outstanding? Let's bring it to the front then.
<= div>
- What is the benefit of running BFD per VNI between a pair of = VTEPs?
GIM2>> An alternative= would be to run CFM between VMs, if there's the need to monitor liveli= ness of the particular VM. Again, this is optional.=C2=A0
=

[ag2] I'm not sure how running p= er-VNI BFD between the VTEPs allows one to monitor the liveliness of VMs.= =C2=A0

[ag3] I think you missed responding to this.=C2=A0= I'm not sure of the value of running BFD per VNI between VTEPs.=C2=A0 = What am I getting that is not covered by running a single BFD session with = VNI 0 between the VTEPs?
=C2=A0
GIM3>> I= 9;ve misspoken. Non-zero VNI is recommended to be used to demultiplex BFD s= essions between the same VTEPs. In section 6.1:
=C2=A0 =C2= =A0The procedure for demultiplexing
=C2=A0 =C2=A0packets with You= r Discriminator equal to 0 is different from
=C2=A0 =C2=A0[RFC588= 0].=C2=A0 For such packets, the BFD session MUST be identified
= =C2=A0 =C2=A0using the inner headers, i.e., the source IP and the destinati= on IP
=C2=A0 =C2=A0present in the IP header carried by the payloa= d of the VXLAN
=C2=A0 =C2=A0encapsulated packet.=C2=A0 The VNI of= the packet SHOULD be used to derive
=C2=A0 =C2=A0interface-relat= ed information for demultiplexing the packet.

Hope that clarifies the use of non-zero VNI in VXLAN encapsulation of a B= FD control packet.

[ag4] = This tells me how the VNI is used for BFD packets being sent/received.=C2= =A0 What is the use case/benefit of doing that?=C2=A0 I am creating a speci= al interface with VNI 0 just for BFD.=C2=A0 Why do I now need to run BFD on= any/all of the other VNIs?=C2=A0 As a developer, if I read this spec, shou= ld I be building this capability or not?=C2=A0 Basically what I'm getti= ng at is I think the draft should recommend using VNI 0.=C2=A0 If there is = a convincing use case for running BFD over other VNIs serviced by that VTEP= , then that needs to be explained.=C2=A0 But as I mentioned before, this le= ads to scaling issues.=C2=A0 So given the scaling issues, it would be good = if an implementation only needed to worry about sending BFD messages on VNI= 0.
=C2=A0
<= div dir=3D"ltr">

Regards,
Greg
<= div dir=3D"ltr">
--000000000000991b78057b5b6953-- From nobody Fri Nov 23 14:47:00 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 35371128CB7; Fri, 23 Nov 2018 14:46:54 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.649 X-Spam-Level: X-Spam-Status: No, score=-1.649 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.25, 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] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id iJ404sDQ0pJl; Fri, 23 Nov 2018 14:46:52 -0800 (PST) Received: from mail-vs1-f50.google.com (mail-vs1-f50.google.com [209.85.217.50]) (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 45593128AFB; Fri, 23 Nov 2018 14:46:52 -0800 (PST) Received: by mail-vs1-f50.google.com with SMTP id g68so7976045vsd.11; Fri, 23 Nov 2018 14:46:52 -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=M8tsQlVKK97UCot7wecXYcEu826Ce08DczWAxmVcqN8=; b=UbIM4/7TMQL/ucty2GKLGk1WSw/FgKNdbKGN7e4aJDruyND393Igm9yyG2WwFGVso6 ztNhIGqzTqbhraS8D5RfXWHCSwCiGVsn4mozG3Szz2LS9QzFURU6uToNpJP9i2P1dpbs htMTip68zq0ngFzetArGFHFxVkGWXI9CY1rPSARPTIiLAX5vDt/hFHYRLV90FjlBJ79P gO++s68AZt2tvhmDuUmfdapnhg2riuNFKr3Fd2yuqRgce2X2VFdcbUBrgT1GkdIDgRG7 Bz9kM4AL3MUGGsqgJQ/GtBz6/DrQmug+m5zzhMd4co3ryBx3y89BvJGVe90dhJaigbqw dDiA== X-Gm-Message-State: AGRZ1gJPvJpwHK+FahsDDrBeI0583kS8kT25OcS6DGj17Nd1DvU3ewgX KbSSTYO9+B1F6n8SF+FnGuUn+CG6kvS4ZYMBaGI= X-Google-Smtp-Source: AFSGD/VfMArYeFz5wSLzaQDnKOmtFE2tGanEEm6SvkcCqCey2Ni/F+ZO3/TXssUO2ICSVBYXP32j1660qVacp/HjEn0= X-Received: by 2002:a67:f851:: with SMTP id b17mr7763118vsp.23.1543013211269; Fri, 23 Nov 2018 14:46:51 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Anoop Ghanwani Date: Fri, 23 Nov 2018 14:46:38 -0800 Message-ID: Subject: Re: WGLC comments on draft-ietf-bfd-vxlan To: Greg Mirsky Cc: rtg-bfd@ietf.org, nvo3@ietf.org Content-Type: multipart/alternative; boundary="000000000000576f26057b5cc29a" Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Nov 2018 22:46:54 -0000 --000000000000576f26057b5cc29a Content-Type: text/plain; charset="UTF-8" Hi Greg, That is fine. Thanks, Anoop On Fri, Nov 23, 2018 at 1:10 PM Greg Mirsky wrote: > Hi Anoop, > thank you for the consise text. I think I've got the idea. Would the minor > tweak be acceptable? > > In most cases, a single BFD session is sufficient for the given VTEP to > monitor > the reachability of a remote VTEP, regardless of the number of VNIs in > common. > When the single BFD session is used to monitor reachability of the remote > VTEP, > an implementation SHOULD use a VNI of 0. > > Regards, > Greg > > On Fri, Nov 23, 2018 at 10:47 AM Anoop Ghanwani > wrote: > >> Hi Greg, >> >> I would recommend the following change. >> >> OLD >> >> 7. Use of reserved VNI >> >> BFD session MAY be established for the reserved VNI 0. One way to >> aggregate BFD sessions between VTEP's is to establish a BFD session >> with VNI 0. A VTEP MAY also use VNI 0 to establish a BFD session >> with a service node. >> >> NEW >> >> 7. Use of reserved VNI >> >> In most cases, only a single BFD session is necessary for a given VTEP >> to monitor the reachability to a remote VTEP, regardless of the number of >> VNIs in common. When a single session is used to monitor reachability >> remote VTEP, an implementation SHOULD use a VNI of 0. >> >> Thanks, >> Anoop >> >> On Thu, Nov 22, 2018 at 12:28 PM Greg Mirsky >> wrote: >> >>> Hi Anoop, >>> apologies if my explanation was not clear. Non-zero VNIs are recommended >>> to be used by a VTEP that received BFD control packet with zero Your >>> Discriminator value. BFD control packets with non-zero Your Discriminator >>> value will be demultiplexed using only that value. As for the special role >>> of VNI 0 the section 7 of the draft states the following: >>> BFD session MAY be established for the reserved VNI 0. One way to >>> aggregate BFD sessions between VTEP's is to establish a BFD session >>> with VNI 0. A VTEP MAY also use VNI 0 to establish a BFD session >>> with a service node. >>> Would you suggest changing the normative language in this text? >>> >>> Regards, >>> Greg >>> >>> PS. Happy Thanksgiving to All! >>> >>> On Wed, Nov 21, 2018 at 11:00 PM Anoop Ghanwani >>> wrote: >>> >>>> Hi Greg, >>>> >>>> See below prefixed with [ag4]. >>>> >>>> Thanks, >>>> Anoop >>>> >>>> On Wed, Nov 21, 2018 at 4:36 PM Greg Mirsky >>>> wrote: >>>> >>>>> Hi Anoop, >>>>> apologies for the miss. Is it the last outstanding? Let's bring it to >>>>> the front then. >>>>> >>>>> - What is the benefit of running BFD per VNI between a pair of VTEPs? >>>>>>>>> >>>>>>>> GIM2>> An alternative would be to run CFM between VMs, if there's >>>>>>>> the need to monitor liveliness of the particular VM. Again, this is >>>>>>>> optional. >>>>>>>> >>>>>>> >>>>>>> [ag2] I'm not sure how running per-VNI BFD between the VTEPs allows >>>>>>> one to monitor the liveliness of VMs. >>>>>>> >>>>>> >>>>> [ag3] I think you missed responding to this. I'm not sure of the >>>>> value of running BFD per VNI between VTEPs. What am I getting that is not >>>>> covered by running a single BFD session with VNI 0 between the VTEPs? >>>>> >>>>> GIM3>> I've misspoken. Non-zero VNI is recommended to be used to >>>>> demultiplex BFD sessions between the same VTEPs. In section 6.1: >>>>> The procedure for demultiplexing >>>>> packets with Your Discriminator equal to 0 is different from >>>>> [RFC5880]. For such packets, the BFD session MUST be identified >>>>> using the inner headers, i.e., the source IP and the destination IP >>>>> present in the IP header carried by the payload of the VXLAN >>>>> encapsulated packet. The VNI of the packet SHOULD be used to derive >>>>> interface-related information for demultiplexing the packet. >>>>> >>>>> Hope that clarifies the use of non-zero VNI in VXLAN encapsulation of >>>>> a BFD control packet. >>>>> >>>> >>>> [ag4] This tells me how the VNI is used for BFD packets being >>>> sent/received. What is the use case/benefit of doing that? I am creating >>>> a special interface with VNI 0 just for BFD. Why do I now need to run BFD >>>> on any/all of the other VNIs? As a developer, if I read this spec, should >>>> I be building this capability or not? Basically what I'm getting at is I >>>> think the draft should recommend using VNI 0. If there is a convincing use >>>> case for running BFD over other VNIs serviced by that VTEP, then that needs >>>> to be explained. But as I mentioned before, this leads to scaling issues. >>>> So given the scaling issues, it would be good if an implementation only >>>> needed to worry about sending BFD messages on VNI 0. >>>> >>>> >>>>> >>>>> Regards, >>>>> Greg >>>>> >>>>>> --000000000000576f26057b5cc29a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Greg,

That is fine.

Thanks,
Anoop

=
On Fri, Nov 23, 2018 at 1:10 PM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop= ,
thank you for the consise text. I think I've got the idea. Would = the minor tweak be acceptable?

In most cases, a single BFD s= ession is sufficient for the given VTEP to monitor
the reachability of a= remote VTEP, regardless of the number of VNIs in common.
When the singl= e BFD session is used to monitor reachability of the remote VTEP,
an im= plementation SHOULD use a VNI of 0.=C2=A0=C2=A0

Regards= ,
Greg

On Fri, Nov 23, 2018 at 10:47 AM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Hi Greg,

I would recommend the following change.

O= LD

7.=C2=A0 Use of reserved VNI

=C2=A0 =C2=A0BFD= session MAY be established for the reserved VNI 0.=C2=A0 One way to
=C2= =A0 =C2=A0aggregate BFD sessions between VTEP's is to establish a BFD s= ession
=C2=A0 =C2=A0with VNI 0.=C2=A0 A VTEP MAY also use VNI 0 to estab= lish a BFD session
=C2=A0 =C2=A0with a service node.

NEW

7= .=C2=A0 Use of reserved VNI

=C2=A0 =C2=A0In most cases, only a singl= e BFD session is necessary for a given VTEP to monitor the reachability to = a remote VTEP, regardless of the number of VNIs in common.=C2=A0 When a sin= gle session is used to monitor reachability remote VTEP, an implementation = SHOULD use a VNI of 0.=C2=A0=C2=A0

Thanks,
Anoop

On Thu, N= ov 22, 2018 at 12:28 PM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop,
a= pologies if my explanation was not clear. Non-zero VNIs are recommended to = be used by a VTEP that received BFD control packet with zero Your Discrimin= ator value. BFD control packets with non-zero Your Discriminator value will= be demultiplexed using only that value. As for the special role of VNI 0 t= he section 7 of the draft states the following:
=C2=A0 =C2= =A0BFD session MAY be established for the reserved VNI 0.=C2=A0 One way to<= /div>
=C2=A0 =C2=A0aggregate BFD sessions between VTEP's is to esta= blish a BFD session
=C2=A0 =C2=A0with VNI 0.=C2=A0 A VTEP MAY als= o use VNI 0 to establish a BFD session
=C2=A0 =C2=A0with a servic= e node.
Would you suggest changing the normative language i= n this text?

Regards,
Greg
PS. Happy Thanksgiving to All!

On Wed, Nov 21, 2018 at 11:00 PM Anoop Gh= anwani <anoop= @alumni.duke.edu> wrote:
Hi Greg,

See below prefixed with [ag4].

Thanks,
Anoop

On Wed, Nov 21, 2018 at 4:36 PM Greg Mirsky <gregimirsky@gmail.= com> wrote:
Hi Anoop,
apologies for the miss. Is it the last outs= tanding? Let's bring it to the front then.

<= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex">
- What is = the benefit of running BFD per VNI between a pair of VTEPs?
GIM2>> An alternative would be to run CFM b= etween VMs, if there's the need to monitor liveliness of the particular= VM. Again, this is optional.=C2=A0

[ag2] I'm not sure how running per-VNI BFD between the= VTEPs allows one to monitor the liveliness of VMs.=C2=A0
=

[ag3] I think you missed responding to this.=C2=A0 I'm not sure of the= value of running BFD per VNI between VTEPs.=C2=A0 What am I getting that i= s not covered by running a single BFD session with VNI 0 between the VTEPs?=
=C2=A0
GIM3>> I've misspoken. Non-zero= VNI is recommended to be used to demultiplex BFD sessions between the same= VTEPs. In section 6.1:
=C2=A0 =C2=A0The procedure for demul= tiplexing
=C2=A0 =C2=A0packets with Your Discriminator equal to 0= is different from
=C2=A0 =C2=A0[RFC5880].=C2=A0 For such packets= , the BFD session MUST be identified
=C2=A0 =C2=A0using the inner= headers, i.e., the source IP and the destination IP
=C2=A0 =C2= =A0present in the IP header carried by the payload of the VXLAN
= =C2=A0 =C2=A0encapsulated packet.=C2=A0 The VNI of the packet SHOULD be use= d to derive
=C2=A0 =C2=A0interface-related information for demult= iplexing the packet.

Hope that clarifies the= use of non-zero VNI in VXLAN encapsulation of a BFD control packet.
<= /div>

[ag4] This tells me how the VNI= is used for BFD packets being sent/received.=C2=A0 What is the use case/be= nefit of doing that?=C2=A0 I am creating a special interface with VNI 0 jus= t for BFD.=C2=A0 Why do I now need to run BFD on any/all of the other VNIs?= =C2=A0 As a developer, if I read this spec, should I be building this capab= ility or not?=C2=A0 Basically what I'm getting at is I think the draft = should recommend using VNI 0.=C2=A0 If there is a convincing use case for r= unning BFD over other VNIs serviced by that VTEP, then that needs to be exp= lained.=C2=A0 But as I mentioned before, this leads to scaling issues.=C2= =A0 So given the scaling issues, it would be good if an implementation only= needed to worry about sending BFD messages on VNI 0.
=C2=A0

=
Regards,
Greg
--000000000000576f26057b5cc29a-- From nobody Fri Nov 23 15:50:24 2018 Return-Path: X-Original-To: rtg-bfd@ietf.org Delivered-To: rtg-bfd@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id C1B3A128CB7; Fri, 23 Nov 2018 15:50:16 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: rtg-bfd@ietf.org Subject: I-D Action: draft-ietf-bfd-vxlan-04.txt X-Test-IDTracker: no X-IETF-IDTracker: 6.89.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: rtg-bfd@ietf.org Message-ID: <154301701672.9578.11438655792100747045@ietfa.amsl.com> Date: Fri, 23 Nov 2018 15:50:16 -0800 Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Nov 2018 23:50:17 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Bidirectional Forwarding Detection WG of the IETF. Title : BFD for VXLAN Authors : Santosh Pallagatti Sudarsan Paragiri Vengada Prasad Govindan Mallik Mudigonda Greg Mirsky Filename : draft-ietf-bfd-vxlan-04.txt Pages : 10 Date : 2018-11-23 Abstract: This document describes the use of the Bidirectional Forwarding Detection (BFD) protocol in Virtual eXtensible Local Area Network (VXLAN) overlay networks. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-bfd-vxlan/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-bfd-vxlan-04 https://datatracker.ietf.org/doc/html/draft-ietf-bfd-vxlan-04 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-bfd-vxlan-04 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 Sat Nov 24 07:57:32 2018 Return-Path: X-Original-To: rtg-bfd@ietfa.amsl.com Delivered-To: rtg-bfd@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B4CA4128C65; Fri, 23 Nov 2018 16:31:12 -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 JObL26DiFtbq; Fri, 23 Nov 2018 16:31:08 -0800 (PST) Received: from mail-lf1-x12b.google.com (mail-lf1-x12b.google.com [IPv6:2a00:1450:4864:20::12b]) (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 4BB821271FF; Fri, 23 Nov 2018 16:31:07 -0800 (PST) Received: by mail-lf1-x12b.google.com with SMTP id i26so9732647lfc.0; Fri, 23 Nov 2018 16:31:07 -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=jVaUcDIBcAqk4LqsBLdjSm5CaQiiu9zeDrwoVcUfaho=; b=GW++3v/4mCurhxIW6NdM24U4eN3DDq8Pl0ZbJIxfTy3aQFlxBq0jU+IYVokEkYW0DD 5aGWrrmY3zHsblFE3MRoXisySOVuh3T98lmUZ1y+Wb0D4XFopATiJOH1OIlWI2ntRmMM skEwfAouDJ/B7ZEFtYqCFTPpoAhLkOCFYJGVeZRxUz4V/KnhTWqT3own5SPKfHSkSrwI bhmJa5EAdHrPivjPTR+T8fYrhTpcalZvSSXWM5plQ9QVHUCU9ReAOU6Uk6U6SGw0dWl2 DCkUtIZ4gHhZ3NHJtmzIiA3IP0QGuBhANRD/6JW6+8JdTuI0F2cTIVmyuuaxaQ+9u1Rf NZ+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=jVaUcDIBcAqk4LqsBLdjSm5CaQiiu9zeDrwoVcUfaho=; b=axLoyaik78cqdU7F88NvuZIwMKgHXtkn8C5KJLsMKhdwd0YEGFp/tvGA1eg2eWcM9K mzLuKorZfAyUHJnYpliz1mNwhrCvhv3wfwPmBRevRkzLmIr5LjQxMhaZJN1iZjUUCwfQ Hh07wg7C10+OlyTPQ8wkytR4LUKI2OnuC0CWg+SaALPaNgFgV+hQzKbFfDbbLxY8fvF7 Q31k1Qdn0FaEKOH6+mEY9E49/77Uy5dbKzWhxp1jXz4IWyIRvVqdCK+VI1F3/ekjKl8V 6uOuOiZF6vNbshIQs2x4vt7KYuhMN8SblTvCEBz7DAXrRyzErZ8v7xS3CUQYMWC9aAtI fiQA== X-Gm-Message-State: AGRZ1gKdG+pDOUCct7JEiS+88Gyz7Zw/tLNm47E/CwGUf2m6jwDUkhaz miWbzuyFDE90lPPlsks9ib+woj7nmVLX704iRtw= X-Google-Smtp-Source: AJdET5d7xGDpsk2Ma2e8StMqpukWM3RfXzHWVs3fERGjBLuTKWCpScL9H96g2+8oofF5X55UZR6BIZ0FsD9gh41GyhU= X-Received: by 2002:a19:c014:: with SMTP id q20mr9884924lff.16.1543019465267; Fri, 23 Nov 2018 16:31:05 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Greg Mirsky Date: Fri, 23 Nov 2018 16:30:53 -0800 Message-ID: Subject: Re: WGLC comments on draft-ietf-bfd-vxlan To: Anoop Ghanwani Cc: rtg-bfd WG , NVO3 Content-Type: multipart/mixed; boundary="0000000000001c188d057b5e37dc" Archived-At: X-Mailman-Approved-At: Sat, 24 Nov 2018 07:57:31 -0800 X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 24 Nov 2018 00:31:13 -0000 --0000000000001c188d057b5e37dc Content-Type: multipart/alternative; boundary="0000000000001c1888057b5e37da" --0000000000001c1888057b5e37da Content-Type: text/plain; charset="UTF-8" Hi Anoop, thank you for your comments and the discussion, much appreciated. All that helped to improve the specification. I've uploaded the -04 version with updates resulting from your comments and our discussion. Hope I've got them all right, please let me know. Attached is the diff and the new version of the draft. Regards, Greg On Fri, Nov 23, 2018 at 2:46 PM Anoop Ghanwani wrote: > Hi Greg, > > That is fine. > > Thanks, > Anoop > > On Fri, Nov 23, 2018 at 1:10 PM Greg Mirsky wrote: > >> Hi Anoop, >> thank you for the consise text. I think I've got the idea. Would the >> minor tweak be acceptable? >> >> In most cases, a single BFD session is sufficient for the given VTEP to >> monitor >> the reachability of a remote VTEP, regardless of the number of VNIs in >> common. >> When the single BFD session is used to monitor reachability of the remote >> VTEP, >> an implementation SHOULD use a VNI of 0. >> >> Regards, >> Greg >> >> On Fri, Nov 23, 2018 at 10:47 AM Anoop Ghanwani >> wrote: >> >>> Hi Greg, >>> >>> I would recommend the following change. >>> >>> OLD >>> >>> 7. Use of reserved VNI >>> >>> BFD session MAY be established for the reserved VNI 0. One way to >>> aggregate BFD sessions between VTEP's is to establish a BFD session >>> with VNI 0. A VTEP MAY also use VNI 0 to establish a BFD session >>> with a service node. >>> >>> NEW >>> >>> 7. Use of reserved VNI >>> >>> In most cases, only a single BFD session is necessary for a given >>> VTEP to monitor the reachability to a remote VTEP, regardless of the number >>> of VNIs in common. When a single session is used to monitor reachability >>> remote VTEP, an implementation SHOULD use a VNI of 0. >>> >>> Thanks, >>> Anoop >>> >>> On Thu, Nov 22, 2018 at 12:28 PM Greg Mirsky >>> wrote: >>> >>>> Hi Anoop, >>>> apologies if my explanation was not clear. Non-zero VNIs are >>>> recommended to be used by a VTEP that received BFD control packet with zero >>>> Your Discriminator value. BFD control packets with non-zero Your >>>> Discriminator value will be demultiplexed using only that value. As for the >>>> special role of VNI 0 the section 7 of the draft states the following: >>>> BFD session MAY be established for the reserved VNI 0. One way to >>>> aggregate BFD sessions between VTEP's is to establish a BFD session >>>> with VNI 0. A VTEP MAY also use VNI 0 to establish a BFD session >>>> with a service node. >>>> Would you suggest changing the normative language in this text? >>>> >>>> Regards, >>>> Greg >>>> >>>> PS. Happy Thanksgiving to All! >>>> >>>> On Wed, Nov 21, 2018 at 11:00 PM Anoop Ghanwani >>>> wrote: >>>> >>>>> Hi Greg, >>>>> >>>>> See below prefixed with [ag4]. >>>>> >>>>> Thanks, >>>>> Anoop >>>>> >>>>> On Wed, Nov 21, 2018 at 4:36 PM Greg Mirsky >>>>> wrote: >>>>> >>>>>> Hi Anoop, >>>>>> apologies for the miss. Is it the last outstanding? Let's bring it to >>>>>> the front then. >>>>>> >>>>>> - What is the benefit of running BFD per VNI between a pair of VTEPs? >>>>>>>>>> >>>>>>>>> GIM2>> An alternative would be to run CFM between VMs, if there's >>>>>>>>> the need to monitor liveliness of the particular VM. Again, this is >>>>>>>>> optional. >>>>>>>>> >>>>>>>> >>>>>>>> [ag2] I'm not sure how running per-VNI BFD between the VTEPs allows >>>>>>>> one to monitor the liveliness of VMs. >>>>>>>> >>>>>>> >>>>>> [ag3] I think you missed responding to this. I'm not sure of the >>>>>> value of running BFD per VNI between VTEPs. What am I getting that is not >>>>>> covered by running a single BFD session with VNI 0 between the VTEPs? >>>>>> >>>>>> GIM3>> I've misspoken. Non-zero VNI is recommended to be used to >>>>>> demultiplex BFD sessions between the same VTEPs. In section 6.1: >>>>>> The procedure for demultiplexing >>>>>> packets with Your Discriminator equal to 0 is different from >>>>>> [RFC5880]. For such packets, the BFD session MUST be identified >>>>>> using the inner headers, i.e., the source IP and the destination IP >>>>>> present in the IP header carried by the payload of the VXLAN >>>>>> encapsulated packet. The VNI of the packet SHOULD be used to >>>>>> derive >>>>>> interface-related information for demultiplexing the packet. >>>>>> >>>>>> Hope that clarifies the use of non-zero VNI in VXLAN encapsulation of >>>>>> a BFD control packet. >>>>>> >>>>> >>>>> [ag4] This tells me how the VNI is used for BFD packets being >>>>> sent/received. What is the use case/benefit of doing that? I am creating >>>>> a special interface with VNI 0 just for BFD. Why do I now need to run BFD >>>>> on any/all of the other VNIs? As a developer, if I read this spec, should >>>>> I be building this capability or not? Basically what I'm getting at is I >>>>> think the draft should recommend using VNI 0. If there is a convincing use >>>>> case for running BFD over other VNIs serviced by that VTEP, then that needs >>>>> to be explained. But as I mentioned before, this leads to scaling issues. >>>>> So given the scaling issues, it would be good if an implementation only >>>>> needed to worry about sending BFD messages on VNI 0. >>>>> >>>>> >>>>>> >>>>>> Regards, >>>>>> Greg >>>>>> >>>>>>> --0000000000001c1888057b5e37da Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Anoop,
thank you for your comments and the discussi= on, much appreciated. All that helped to improve the specification. I'v= e uploaded the -04 version with updates resulting from your comments and ou= r discussion. Hope I've got them all right, please let me know. Attache= d is the diff and the new version of the draft.

Re= gards,
Greg

On Fri, Nov 23, 2018 at 2:46 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Hi Greg,

That = is fine.

Thanks,
Anoop

On Fri, Nov 23, 2018 at 1:10 PM G= reg Mirsky <g= regimirsky@gmail.com> wrote:
Hi Anoop,
thank you for the consise = text. I think I've got the idea. Would the minor tweak be acceptable?

In most cases, a single BFD session is sufficient for the giv= en VTEP to monitor
the reachability of a remote VTEP, regardless of the = number of VNIs in common.
When the single BFD session is used to monitor= reachability of the remote VTEP,
an implementation SHOULD use a VNI of= 0.=C2=A0=C2=A0

Regards,
Greg

=
On Fri, Nov 23, 2018 at 10:47 A= M Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Hi Greg,

I would recommend the f= ollowing change.

OLD

7.=C2=A0 = Use of reserved VNI

=C2=A0 =C2=A0BFD session MAY be established for = the reserved VNI 0.=C2=A0 One way to
=C2=A0 =C2=A0aggregate BFD sessions= between VTEP's is to establish a BFD session
=C2=A0 =C2=A0with VNI = 0.=C2=A0 A VTEP MAY also use VNI 0 to establish a BFD session
=C2=A0 =C2= =A0with a service node.

NEW

7.=C2=A0 Use of reserved VNI
<= br>=C2=A0 =C2=A0In most cases, only a single BFD session is necessary for a= given VTEP to monitor the reachability to a remote VTEP, regardless of the= number of VNIs in common.=C2=A0 When a single session is used to monitor r= eachability remote VTEP, an implementation SHOULD use a VNI of 0.=C2=A0=C2= =A0

Thanks,
Anoop

On Thu, Nov 22, 2018 at 12:28 PM Greg Mi= rsky <gregimi= rsky@gmail.com> wrote:
Hi Anoop,
apologies if my explanation was = not clear. Non-zero VNIs are recommended to be used by a VTEP that received= BFD control packet with zero Your Discriminator value. BFD control packets= with non-zero Your Discriminator value will be demultiplexed using only th= at value. As for the special role of VNI 0 the section 7 of the draft state= s the following:
=C2=A0 =C2=A0BFD session MAY be established= for the reserved VNI 0.=C2=A0 One way to
=C2=A0 =C2=A0aggregate = BFD sessions between VTEP's is to establish a BFD session
=C2= =A0 =C2=A0with VNI 0.=C2=A0 A VTEP MAY also use VNI 0 to establish a BFD se= ssion
=C2=A0 =C2=A0with a service node.
Would you= suggest changing the normative language in this text?

=
Regards,
Greg

PS. Happy Thanksgivin= g to All!

= On Wed, Nov 21, 2018 at 11:00 PM Anoop Ghanwani <anoop@alumni.duke.edu> wrote:
Hi Greg,

See below prefixed with [ag4].

Thanks,
Anoop

On Wed, N= ov 21, 2018 at 4:36 PM Greg Mirsky <gregimirsky@gmail.com> wrote:
Hi Anoop,
ap= ologies for the miss. Is it the last outstanding? Let's bring it to the= front then.

<= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex">
- What is the benefit of running BFD per VNI = between a pair of VTEPs?
GIM2>&= gt; An alternative would be to run CFM between VMs, if there's the need= to monitor liveliness of the particular VM. Again, this is optional.=C2=A0=

[ag2] I'm not = sure how running per-VNI BFD between the VTEPs allows one to monitor the li= veliness of VMs.=C2=A0

[ag3] I think you missed respondin= g to this.=C2=A0 I'm not sure of the value of running BFD per VNI betwe= en VTEPs.=C2=A0 What am I getting that is not covered by running a single B= FD session with VNI 0 between the VTEPs?
=C2=A0
G= IM3>> I've misspoken. Non-zero VNI is recommended to be used to d= emultiplex BFD sessions between the same VTEPs. In section 6.1:
<= div>=C2=A0 =C2=A0The procedure for demultiplexing
=C2=A0 =C2=A0pa= ckets with Your Discriminator equal to 0 is different from
=C2=A0= =C2=A0[RFC5880].=C2=A0 For such packets, the BFD session MUST be identifie= d
=C2=A0 =C2=A0using the inner headers, i.e., the source IP and t= he destination IP
=C2=A0 =C2=A0present in the IP header carried b= y the payload of the VXLAN
=C2=A0 =C2=A0encapsulated packet.=C2= =A0 The VNI of the packet SHOULD be used to derive
=C2=A0 =C2=A0i= nterface-related information for demultiplexing the packet.

Hope that clarifies the use of non-zero VNI in VXLAN encaps= ulation of a BFD control packet.

[ag4] This tells me how the VNI is used for BFD packets being sent/= received.=C2=A0 What is the use case/benefit of doing that?=C2=A0 I am crea= ting a special interface with VNI 0 just for BFD.=C2=A0 Why do I now need t= o run BFD on any/all of the other VNIs?=C2=A0 As a developer, if I read thi= s spec, should I be building this capability or not?=C2=A0 Basically what I= 'm getting at is I think the draft should recommend using VNI 0.=C2=A0 = If there is a convincing use case for running BFD over other VNIs serviced = by that VTEP, then that needs to be explained.=C2=A0 But as I mentioned bef= ore, this leads to scaling issues.=C2=A0 So given the scaling issues, it wo= uld be good if an implementation only needed to worry about sending BFD mes= sages on VNI 0.
=C2=A0

Regards,
Greg
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From: "Carlos Pignataro (cpignata)" To: Greg Mirsky CC: "mpls-chairs@ietf.org" , mpls , rtg-bfd WG Subject: Re: [mpls] MPLS WG adoption call for draft-mirsky-mpls-p2mp-bfd Thread-Topic: [mpls] MPLS WG adoption call for draft-mirsky-mpls-p2mp-bfd Thread-Index: AQHUcjCnBAZrmoA7/EOd5Vk0epnVbaVBxIEAgAEfEACAAsmgAIAT+0aAgAXE2YA= Date: Sat, 24 Nov 2018 18:52:06 +0000 Message-ID: <88AC4C8C-C945-4B46-BA8D-42EDAA2EBEC8@cisco.com> References: <15CB10A6-6AF4-460F-A71D-56F28D9D7784@cisco.com> <5BFD9FF7-DBF8-48E6-BF45-1D29AFB90034@cisco.com> <81371D06-2A1A-480F-B65D-FAF04E408A04@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 (2.3445.101.1) x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.82.209.75] Content-Type: multipart/alternative; boundary="_000_88AC4C8CC9454B46BA8D42EDAA2EBEC8ciscocom_" MIME-Version: 1.0 X-Outbound-SMTP-Client: 64.101.220.158, 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X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.29 List-Id: "RTG Area: Bidirectional Forwarding Detection DT" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Nov 2018 19:53:08 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Bidirectional Forwarding Detection WG of the IETF. Title : BFD Multipoint Active Tails. Authors : Dave Katz Dave Ward Santosh Pallagatti Greg Mirsky Filename : draft-ietf-bfd-multipoint-active-tail-10.txt Pages : 19 Date : 2018-11-28 Abstract: This document describes active tail extensions to the Bidirectional Forwarding Detection (BFD) protocol for multipoint networks. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-bfd-multipoint-active-tail/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-bfd-multipoint-active-tail-10 https://datatracker.ietf.org/doc/html/draft-ietf-bfd-multipoint-active-tail-10 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-bfd-multipoint-active-tail-10 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/