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h38mr1387598lfi.73.1504907202905; Fri, 08 Sep 2017 14:46:42 -0700 (PDT) MIME-Version: 1.0 Received: by 10.46.88.81 with HTTP; Fri, 8 Sep 2017 14:46:41 -0700 (PDT) In-Reply-To: References: <20170811053550.27303B81263@rfc-editor.org> <20170811173930.GJ24942@pfrc.org> <705BEEE3-BC31-42CA-BE0F-06EB6E529A65@cisco.com> <6F83D826-CF7F-462A-BE54-35F46D76A9A8@juniper.net> From: Greg Mirsky Date: Fri, 8 Sep 2017 14:46:41 -0700 Message-ID: Subject: Re: [Technical Errata Reported] RFC5884 (5085) To: Balaji Rajagopalan Cc: Mach Chen , "Carlos Pignataro (cpignata)" , Jeffrey Haas , Kireeti Kompella , Thomas Nadeau , "rtg-bfd@ietf.org" , "Reshad Rahman (rrahman)" , Alia Atlas Content-Type: multipart/alternative; boundary="001a113fb3743fcb8e0558b48310" Archived-At: X-BeenThere: rtg-bfd@ietf.org X-Mailman-Version: 2.1.22 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, 08 Sep 2017 21:46:49 -0000 --001a113fb3743fcb8e0558b48310 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Balaj, I think that we need help from WG chairs to find the best way to handle this case. The original Errata that triggered this very helpful discussion propsed the following new text: The egress LSR MUST respond with an LSP Ping Echo reply message that MAY carry the local discriminator assigned by it for the BFD session. Your new proposal is very much different: The egress LSR MUST follow the procedures described in [RFC4379] in processing the LSP Ping request. The LSP Ping reply generated by the egress MAY carry the local discriminator assigned by it for the BFD session. I agree with latter but think that text proposed by Les goes further in clarifying bootstrapping of BFD session. Perhaps the question is not only in improving the original text: The egress LSR MAY respond with an LSP Ping Echo reply message that carries the local discriminator assigned by it for the BFD session. but making the whole RFC 5884 clearer by drafting 5884bis. I 'd propose two questions to continue the discussion: - would 5884bis recommend use of particular Reply mode in echo request with BFD Discriminator TLV; - whether echo reply includes BFD Discriminator it the Reply mode is set to one of values that commands to send the reply. To the first I propose to consider that the ingress LER SHOULD set Reply mode to No reply. And to the second that the ingress LER SHOULD NOT include BFD Discriminator TLV when sending echo reply to the BFD session bootstrapping LSP ping. Regards, Greg On Tue, Sep 5, 2017 at 6:06 AM, Balaji Rajagopalan wrote: > Hi Greg, > > > > While all the issues you bring up are valid, the change I had proposed > merely makes a minor correction to improve textual clarity. There was no > attempt to alter the protocol in any way. > > > > I think both the following aspects are non-trivial, and are beyond the > scope of errata. Perhaps, these issues are better addressed in a =E2=80= =9C-bis=E2=80=9D. > > > > - Removal of BFD-disc from the LSP-Ping reply. I defer > to Kireeti & other authors of the RFC to comment/decide whether BFD-disc > can be removed from the reply. > > - Rules to specify handling of mismatch between BFD-disc in the > LSP-Ping reply & the BFD session > > > > -- > > Balaji Rajagopalan > > > > > > *From: *Greg Mirsky > *Date: *Wednesday, 23 August 2017 at 7:51 AM > *To: *Balaji Rajagopalan > *Cc: *Mach Chen , "Carlos Pignataro (cpignata)" < > cpignata@cisco.com>, Jeffrey Haas , Kireeti Kompella < > kireeti@juniper.net>, Thomas Nadeau , " > rtg-bfd@ietf.org" , "Reshad Rahman (rrahman)" < > rrahman@cisco.com>, Alia Atlas > > *Subject: *Re: [Technical Errata Reported] RFC5884 (5085) > > > > Hi Balaji, > > I've been thinking about the value of including BFD Discriminator TLV in > echo reply sent by egress. What we'd expect ingress to do upon receiving > the reply? Match to bfd.remoteDiscr? I think that then echo reply must > include the value from the original BFD Discriminator TLV so that ingress > uses it to demux BFD sessions. Or ingress doesn't validate the value in B= FD > Discriminator TLV but only that the TLV is included in reply? If we leave > actions of the ingress upon receipt of the reply with BFD Discriminator > underspecified it may result in another set of interoperability issues. > Perhaps the simplest way to avoid that would be to not allow BFD > Discriminator TLV in the reply. > > > > Regards, > > Greg > > > > On Tue, Aug 22, 2017 at 2:16 AM, Balaji Rajagopalan > wrote: > > That sounds better. How about the following text? > > > > The egress LSR MUST follow the procedures described in [RFC4379] in > processing the LSP Ping request. The LSP Ping reply generated by the egre= ss > MAY carry the local discriminator assigned by it for the BFD session. > > > > -- > > Balaji Rajagopalan > > > > *From: *Mach Chen > *Date: *Thursday, 17 August 2017 at 8:45 AM > *To: *"Carlos Pignataro (cpignata)" , Balaji > Rajagopalan , Greg Mirsky , > Jeffrey Haas > *Cc: *Kireeti Kompella , Thomas Nadeau < > tnadeau@lucidvision.com>, "rtg-bfd@ietf.org" , "Reshad > Rahman (rrahman)" , Alia Atlas > *Subject: *RE: [Technical Errata Reported] RFC5884 (5085) > > > > Indeed, I also like Les=E2=80=99s suggestion! > > > > Best regards, > > Mach > > > > *From:* Rtg-bfd [mailto:rtg-bfd-bounces@ietf.org] *On Behalf Of *Carlos > Pignataro (cpignata) > *Sent:* Wednesday, August 16, 2017 10:20 PM > *To:* Balaji Rajagopalan ; Greg Mirsky < > gregimirsky@gmail.com>; Jeffrey Haas > *Cc:* Kireeti Kompella ; Thomas Nadeau < > tnadeau@lucidvision.com>; rtg-bfd@ietf.org; Reshad Rahman (rrahman) < > rrahman@cisco.com>; Alia Atlas > *Subject:* Re: [Technical Errata Reported] RFC5884 (5085) > > > > This sounds like a good summary of the tactical fix. > > > > (Although, like Les wrote down, saying =E2=80=9CMUST follow [LSP-Ping]=E2= =80=9D is better > than =E2=80=9CMUST Send a Reply=E2=80=9D) > > > > As an aside -- When it comes to Interop, I remember also issues around th= e > UDP Port on the egress BFD Control packet, depending on whether the > response is IP-based vs. over an MPLS LSP. Tracking this down, this was > identified at https://www.ietf.org/mail-archive/web/rtg-bfd/current/ > msg00447.html (comments on Sections 6 and 7), and it seems, we may have > the right bug but a wrong fix. > > > > Thanks, > > > > -- Carlos. > > > > *From: *Rtg-bfd on behalf of Balaji > Rajagopalan > *Date: *Wednesday, August 16, 2017 at 1:23 AM > *To: *Greg Mirsky , Jeff Haas > *Cc: *Kireeti Kompella , Tom Nadeau < > tnadeau@lucidvision.com>, "rtg-bfd@ietf.org" , "Reshad > Rahman (rrahman)" , Alia Atlas > *Subject: *Re: [Technical Errata Reported] RFC5884 (5085) > > > > I=E2=80=99m aware of three different behaviours from three different vend= ors that > I came across in the course of inter-op: > > - Always respond to an LSP-Ping request carrying a BFD disc > > - Never send a response to an LSP-Ping request carrying a BFD dis= c > > - Don=E2=80=99t respond to the first LSP-Ping request carrying a = BFD > disc, but respond to the subsequent ones > > > > This experience leads me to believe that this procedure is NOT > well-understood. So, publication of errata on this issue is necessary. > > > > As some of the co-authors have clarified in further emails, inclusion of > BFD discriminator in the LSP-Ping request does not change LSP-Ping=E2=80= =99s basic > function. So, the egress must send a reply. This is what the erratum > clarifies. > > > > -- > > Balaji Rajagopalan > > > > > > > > *From: *Rtg-bfd on behalf of Greg Mirsky < > gregimirsky@gmail.com> > *Date: *Friday, 11 August 2017 at 11:42 PM > *To: *Jeffrey Haas > *Cc: *Kireeti Kompella , Thomas Nadeau < > tnadeau@lucidvision.com>, "rtg-bfd@ietf.org" , "Reshad > Rahman (rrahman)" , Alia Atlas > *Subject: *Re: [Technical Errata Reported] RFC5884 (5085) > > > > Re-sending to the corrected list (apologies for duplicates). > > > > Dear All, > > I suggest to reject this proposal. The current text is clear and the > mechanics of bootstrapping BFD session over MPLS LSP is well understood - > remote peer MUST start sending BFD control packets first and BFD peer MAY > send Echo Reply with its Local Discriminator as value in BFD Discriminato= r > TLV. > > > > Regards, > > Greg > > > > On Fri, Aug 11, 2017 at 10:39 AM, Jeffrey Haas wrote: > > [Note that I have adjusted the addresses in the headers to try to catch t= he > RFC authors' current accounts.] > > > The 5884 interop issue keeps bubbling up. Balaji submitted an errata, > which > provides us with a good place to start technical discussion. > > Please note I also spent some time off-list discussing this errata with > Balaji. > > > On Thu, Aug 10, 2017 at 10:35:50PM -0700, RFC Errata System wrote: > > Section: 6 > > > > Original Text > > ------------- > > The egress LSR MAY respond with an LSP Ping Echo > > reply message that carries the local discriminator assigned by it for > > the BFD session. > > > > Corrected Text > > -------------- > > The egress LSR MUST respond with an LSP Ping Echo reply message that > > MAY carry the local discriminator assigned by it for the BFD session. > > > > > > Notes > > ----- > > It is not clear from the original text which of the following is > optional: > > - The egress MUST send a reply, but the discriminator in the reply i= s > optional > > - The reply itself is optional > > > > Technically, the reply cannot be optional, because the egress needs to > report LSP-Ping verification status to the ingress. > > > > The proposed text recommends to include BFD discriminator in the reply. > This was the intent of the original text. > > My opinion follows: > > In section 6 - > > : On receipt of the LSP Ping Echo request message, the egress LSR MUST > : send a BFD Control packet to the ingress LSR, if the validation of > : the FEC in the LSP Ping Echo request message succeeds. This BFD > : Control packet MUST set the Your Discriminator field to the > : discriminator received from the ingress LSR in the LSP Ping Echo > : request message. The egress LSR MAY respond with an LSP Ping Echo > : reply message that carries the local discriminator assigned by it fo= r > : the BFD session. The local discriminator assigned by the egress LSR > : MUST be used as the My Discriminator field in the BFD session packet= s > : sent by the egress LSR. > > In the text above, I consider it quite clear that the receipt of the BFD > packet contains sufficient state to bring up the BFD session. The receip= t > of the same Discriminator in the LSP Ping Echo Reply is optional. > > This makes sense partially because the reply may be dropped and we want t= he > BFD session to come up as fast as possible. > > The point of contention appears to be what to do if we *never* get such > replies. It's worth pointing out additional text in RFC 5884, section 3.= 2. > > : Hence, BFD is used in conjunction with LSP Ping for MPLS LSP fault > : detection: > : > : i) LSP Ping is used for bootstrapping the BFD session as describe= d > : later in this document. > : > : ii) BFD is used to exchange fault detection (i.e., BFD session) > : packets at the required detection interval. > : > : iii) LSP Ping is used to periodically verify the control plane > : against the data plane by ensuring that the LSP is mapped to > : the same FEC, at the egress, as the ingress. > > iii above reminds us that the LSP may be torn down because LSP Ping fails= . > Thus, it seems problematic that we do not get a reply ever. > > However, with the BFD session in the Up state, we have information provin= g > that the LSP is up. Thus we have contradictory intent. > > --- > > My opinion is that the MAY in the RFC 5884 procedures is intended to have > the BFD session come up by the most expedient means. I do not believe th= e > likely intent was to say "don't send Echo Reply". Among other things, th= at > seems contrary to the intent of the general LSP Ping procedures. > > Having given my personal observations, we now get to the business of the > Working Group: Debating intent and related text. > > -- Jeff > > > > > --001a113fb3743fcb8e0558b48310 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Balaj,
I think that we need help from WG chairs to = find the best way to handle this case. The original Errata that triggered t= his very helpful discussion propsed the following new text:
The egress LSR MUST respond with an LSP Ping Echo re= ply message that
MAY carr= y the local discriminator assigned by it for the BFD session.
<= /blockquote>
Your new proposal is very= much different:
The egress LSR MUST follow the procedures describ= ed in [RFC4379] in processing the LSP Ping request. The LSP Ping reply gene= rated by the egress MAY carry the local discriminator assigned by it for th= e BFD session.
I agree with latter but think that t= ext proposed by Les goes further in clarifying bootstrapping of BFD session= . Perhaps the question is not only in improving the original text:
<= span style=3D"font-size:12.8px">The egress LSR MAY respond with an LSP Ping= Echo
reply message that = carries the local discriminator assigned by it for
the BFD= session.
but making the whole RFC 5884 clearer by drafti= ng 5884bis. I 'd propose two questions to continue the discussion:
=
  • would 5884bis recommend use of particular Reply mode in echo reques= t with BFD Discriminator TLV;
  • whether echo reply includes BFD Discr= iminator it the Reply mode is set to one of values that commands to send th= e reply.
To the first I propose to consider that the ingress LER S= HOULD set Reply mode to No reply. And to the second that the ingress LER SH= OULD NOT include BFD Discriminator TLV when sending echo reply to the BFD s= ession bootstrapping LSP ping.

Regards,
= Greg

O= n Tue, Sep 5, 2017 at 6:06 AM, Balaji Rajagopalan <balajir@juniper.net> wrote:

Hi Greg,<= u>

=C2=A0=

While all the is= sues you bring up are valid, the change I had proposed merely makes a minor= correction to improve textual clarity. There was no attempt to alter the p= rotocol in any way.=C2=A0

=C2=A0=

I think both the= following aspects are non-trivial, and are beyond the scope of errata. Per= haps, these issues are better addressed in a =E2=80=9C-bis=E2=80=9D.=

=C2=A0=

-=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Removal of BFD-disc from the LSP-Pin= g reply. I defer to=C2=A0Kireeti=C2=A0& other authors of the RFC to com= ment/decide whether BFD-disc can be removed from the reply.

-=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Rules to specify handling of mismatc= h between BFD-disc in the LSP-Ping reply & the BFD session

=C2=A0=

--=

Balaji Rajagopal= an

=C2=A0=

=C2=A0=

F= rom: Greg Mirsky <gregimirsky@gmail.com>
Date: Wednesday, 23 August 2017 at 7:51 AM
To: Balaji Rajagopalan <balajir@juniper.net>
Cc: Mach Chen <mach.chen@huawei.com>, "Carlos Pignataro (cpignata)&quo= t; <cpignata@cis= co.com>, Jeffrey Haas <jhaas@pfrc.org>, Kireeti Kompella <kireeti@juniper.net>, Thomas = Nadeau <tna= deau@lucidvision.com>, "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>, "Reshad Rahman (rrahman)" <rrahman@cisco.com>, Alia Atlas <akatlas@gmail.com>


Subject: Re: [Technical Errata Reported] RFC5884 (5085)

=C2=A0

Hi Balaji,

I've been thinking about the value of including = BFD Discriminator TLV in echo reply sent by egress. What we'd expect in= gress to do upon receiving the reply? Match to bfd.remoteDiscr? I think tha= t then echo reply must include the value from the original BFD Discriminator TLV so that ingress uses it to demux BFD se= ssions. Or ingress doesn't validate the value in BFD Discriminator TLV = but only that the TLV is included in reply? If we leave actions of the ingr= ess upon receipt of the reply with BFD Discriminator underspecified it may result in another set of interoperabil= ity issues. Perhaps the simplest way to avoid that would be to not allow BF= D Discriminator TLV in the reply.

=C2=A0

Regards,

Greg

=C2=A0

On Tue, Aug 22, 2017 at 2:16 AM, Balaji Rajagopalan = <balajir@junipe= r.net> wrote:

That sounds bett= er. How about the following text?

=C2=A0=

The egress LSR M= UST follow the procedures described in [RFC4379] in processing the LSP Ping= request. The LSP Ping reply generated by the egress MAY carry the local discriminator assigned by it for the BFD session.

=C2=A0=

--=

Balaji Rajagopal= an

=C2=A0=

F= rom: Mach Chen <mach.chen@huawei.co= m>
Date: Thursday, 17 August 2017 at 8:45 AM
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, Balaji Raja= gopalan <balaji= r@juniper.net>, Greg Mirsky <gregimirsky@gmail.com>, Jeffrey Haas <jhaas= @pfrc.org>
Cc: Kireeti Kompella <kireeti@juniper.net>, Thomas Nadeau <tnadeau@lucidvision.com&= gt;, "rtg-bfd@ie= tf.org" <rtg-bfd@ietf.org= >, "Reshad Rahman (rrahman)" <rrahman@cisco.com>, Alia Atlas <akatlas@gmail.com&g= t;
Subject: RE: [Technical Errata Reported] RFC5884 (5085)

=C2=A0

Indeed, I also like Les=E2=80=99s suggestion!<= u>

=C2=A0

Best regards,

Mach

=C2=A0

From: R= tg-bfd [mailto:rtg-bfd-bounces@ietf.org] On Behalf Of Carlos Pignataro (cpignata)
Sent: Wednesday, August 16, 2017 10:20 PM
To: Balaji Rajagopalan <balajir@juniper.net>; Greg Mirsky <gregimirsky@gmail.com>;= Jeffrey Haas <jhaas= @pfrc.org>
Cc: Kireeti Kompella <kireeti@juniper.net>; Thomas Nadeau <tnadeau@lucidvision.com&= gt;; rtg-bfd@ietf.org;= Reshad Rahman (rrahman) <rrahman@cisco.com>; Alia Atlas <akatlas@gmail.com>
Subject: Re: [Technical Errata Reported] RFC5884 (5085)

=C2=A0

This sounds like a good summary of the tactical fix.<= /p>

=C2=A0

(Although, like Les wrote down, saying =E2=80=9CMUST follow [LSP-Ping]=E2= =80=9D is better than =E2=80=9CMUST Send a Reply=E2=80=9D)=

=C2=A0

As an aside -- When it comes to Interop, I remember also issues around the= UDP Port on the egress BFD Control packet, depending on whether the response is IP-based vs. over an MPLS LSP.=C2=A0 Tracking t= his down, this was identified at https://www.ietf.org/mail-archive/web/rtg-bfd/current/msg00447.ht= ml (comments on Sections 6 and 7), and it seems, we may have the right = bug but a wrong fix.

=C2=A0

Thanks,

=C2=A0

-- Carlos.

=C2=A0

From: Rtg-bfd <rtg-bfd-bounces@ietf.org> on b= ehalf of Balaji Rajagopalan <balajir@juniper.net>
Date: Wednesday, August 16, 2017 at 1:23 AM
To: Greg Mirsky <gregimirsky@gmail.com>, Jeff Haas <jhaas@pfrc.org>
Cc: Kireeti Kompella <kireeti@juniper.net>, Tom Nadeau <tnadeau@lucidvision.com>= , "rtg-bfd@ietf.= org" <rtg-bfd@ietf.org= >, "Reshad Rahman (rrahman)" <rrahman@cisco.com>, Alia Atlas <akatlas@gmail.com&g= t;
Subject: Re: [Technical Errata Reported] RFC5884 (5085)

=C2=A0

I=E2=80=99m awar= e of three different behaviours from three different vendors that I came ac= ross in the course of inter-op:

-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Always respond to an LSP-Ping request c= arrying a BFD disc

-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Never send a response to an LSP-Ping re= quest carrying a BFD disc

-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Don=E2=80=99t respond to the first LSP-= Ping request carrying a BFD disc, but respond to the subsequent ones=

=C2=A0

This experience = leads me to believe that this procedure is NOT well-understood.=C2=A0 So, p= ublication of errata on this issue is necessary.

=C2=A0=

As some of the c= o-authors have clarified in further emails, inclusion of BFD discriminator = in the LSP-Ping request does not change LSP-Ping=E2=80=99s basic function. So, the egress must send a reply. This is what the erratum clari= fies.

=C2=A0=

--=

Balaji Rajagopal= an

=C2=A0=

=C2=A0=

=C2=A0=

F= rom: Rtg-bfd <rtg-bfd-bounces@i= etf.org> on behalf of Greg Mirsky <gregimirsky@gmail.com>
Date: Friday, 11 August 2017 at 11:42 PM
To: Jeffrey Haas <jhaas@pfrc.org>
Cc: Kireeti Kompella <kireeti@juniper.net>, Thomas Nadeau <tnadeau@lucidvision.com&= gt;, "rtg-bfd@ie= tf.org" <rtg-bfd@ietf.org= >, "Reshad Rahman (rrahman)" <rrahman@cisco.com>, Alia Atlas <akatlas@gmail.com&g= t;
Subject: Re: [Technical Errata Reported] RFC5884 (5085)

=C2=A0

Re-sending to the corrected list (apologies for dupl= icates).

=C2=A0

Dear All,

I suggest to reject = this proposal. The current text is clear and the mechanics of bootstrapping= BFD session over MPLS LSP is well understood - remote peer MUST start sending BFD control packets first and BFD peer MAY send Ec= ho Reply with its Local Discriminator as value in BFD Discriminator TLV.

=C2=A0=

Regards,

Greg

=C2=A0

On Fri, Aug 11, 2017 at 10:39 AM, Jeffrey Haas <<= a href=3D"mailto:jhaas@pfrc.org" target=3D"_blank">jhaas@pfrc.org> w= rote:

[Note that I have adj= usted the addresses in the headers to try to catch the
RFC authors' current accounts.]


The 5884 interop issue keeps bubbling up.=C2=A0 Balaji submitted an errata,= which
provides us with a good place to start technical discussion.

Please note I also spent some time off-list discussing this errata with
Balaji.


On Thu, Aug 10, 2017 at 10:35:50PM -0700, RFC Errata System wrote:
> Section: 6
>
> Original Text
> -------------
> The egress LSR MAY respond with an LSP Ping Echo
> reply message that carries the local discriminator assigned by it for<= br> > the BFD session.
>
> Corrected Text
> --------------
> The egress LSR MUST respond with an LSP Ping Echo reply message that > MAY carry the local discriminator assigned by it for the BFD session.<= br> >
>
> Notes
> -----
> It is not clear from the original text which of the following is optio= nal:
>=C2=A0 =C2=A0-=C2=A0 The egress MUST send a reply, but the discriminato= r in the reply is optional
>=C2=A0 =C2=A0-=C2=A0 The reply itself is optional
>
> Technically, the reply cannot be optional, because the egress needs to= report LSP-Ping verification status to the ingress.
>
> The proposed text recommends to include BFD discriminator in the reply= . This was the intent of the original text.

My opinion follows:

In section 6 -

:=C2=A0 =C2=A0 On receipt of the LSP Ping Echo request message, the egress = LSR MUST
:=C2=A0 =C2=A0 send a BFD Control packet to the ingress LSR, if the validat= ion of
:=C2=A0 =C2=A0 the FEC in the LSP Ping Echo request message succeeds.=C2=A0= This BFD
:=C2=A0 =C2=A0 Control packet MUST set the Your Discriminator field to the<= br> :=C2=A0 =C2=A0 discriminator received from the ingress LSR in the LSP Ping = Echo
:=C2=A0 =C2=A0 request message.=C2=A0 The egress LSR MAY respond with an LS= P Ping Echo
:=C2=A0 =C2=A0 reply message that carries the local discriminator assigned = by it for
:=C2=A0 =C2=A0 the BFD session.=C2=A0 The local discriminator assigned by t= he egress LSR
:=C2=A0 =C2=A0 MUST be used as the My Discriminator field in the BFD sessio= n packets
:=C2=A0 =C2=A0 sent by the egress LSR.

In the text above, I consider it quite clear that the receipt of the BFD packet contains sufficient state to bring up the BFD session.=C2=A0 The rec= eipt
of the same Discriminator in the LSP Ping Echo Reply is optional.

This makes sense partially because the reply may be dropped and we want the=
BFD session to come up as fast as possible.

The point of contention appears to be what to do if we *never* get such
replies.=C2=A0 It's worth pointing out additional text in RFC 5884, sec= tion 3.2.

:=C2=A0 =C2=A0 Hence, BFD is used in conjunction with LSP Ping for MPLS LSP= fault
:=C2=A0 =C2=A0 detection:
:
:=C2=A0 =C2=A0 =C2=A0 =C2=A0i) LSP Ping is used for bootstrapping the BFD s= ession as described
:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 later in this document.
:
:=C2=A0 =C2=A0 =C2=A0 ii) BFD is used to exchange fault detection (i.e., BF= D session)
:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 packets at the required detection inter= val.
:
:=C2=A0 =C2=A0 =C2=A0iii) LSP Ping is used to periodically verify the contr= ol plane
:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 against the data plane by ensuring that= the LSP is mapped to
:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 the same FEC, at the egress, as the ing= ress.

iii above reminds us that the LSP may be torn down because LSP Ping fails.<= br> Thus, it seems problematic that we do not get a reply ever.

However, with the BFD session in the Up state, we have information proving<= br> that the LSP is up.=C2=A0 Thus we have contradictory intent.

---

My opinion is that the MAY in the RFC 5884 procedures is intended to have the BFD session come up by the most expedient means.=C2=A0 I do not believe= the
likely intent was to say "don't send Echo Reply".=C2=A0 Among= other things, that
seems contrary to the intent of the general LSP Ping procedures.

Having given my personal observations, we now get to the business of the Working Group: Debating intent and related text.

-- Jeff

=C2=A0

=C2=A0


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