Re: [Bier] BAR field length in draft-ietf-bier-isis-extensions and draft-ietf-bier-ospf-extensions
Alia Atlas <[email protected]> Mon, 19 Feb 2018 22:25:31 -0500
| Newsgroups | gmane.ietf.isis |
|---|---|
| Message-ID | <CAG4d1reAj9hoSACq8mRB4H1E2wiaLxvqZ6cirxuMNMAR9=OkmA@mail.gmail.com> |
--===============9142888096833482746== Content-Type: multipart/related; boundary="001a113cd1f8ed32b505659c5c6f" --001a113cd1f8ed32b505659c5c6f Content-Type: multipart/alternative; boundary="001a113cd1f8ed32b105659c5c6e" --001a113cd1f8ed32b105659c5c6e Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Les, Let me clarify - rereading your email again where you clearly suggest using 128 values for flex-algo. (I've been working all evening - except for ducking out for that 10 minutes to chase the kids to bed in the middle of that last email.) a) I found the need for an SR Algorithm field to be limited, given our experience with different IGP algorithms. I would also be stunned if we got to 10 different algorithms. b) Having unclear semantics because an algorithm only makes sense for BIER or only makes sense for an IGP-specific technology is not good. c) Adding the complexity to consider how and when to use an algorithm or similar new feature that makes sense for a link-state IGP - to then also consider if it can apply to BIER and if it can work in non-link-state IGPs - would only make sense if it were balanced by an equal technical benefit. These drafts were WGLCed in June - with no BAR. In October, I did not just insist on a IANA registry for the BAR in the BIER registries - because it was claimed that would let the documents progress and not force to an assumption. I regret that decision - given the poor efforts to force a registry merge. IF you and Ice truly believe that this is the technically correct thing to do, then you would make substantive technical arguments instead of this sophistry. I have given several more chances to allow this WG to discuss whether any changes are needed or are desirable. I am pushing for technical discussion. I am quite disappointed in the level of discourse; the BIER-WG has traditionally worked very collegially with substantive technical points. Regards, Alia On Mon, Feb 19, 2018 at 10:11 PM, Alia Atlas <[email protected]> wrote: > Les, > > On Mon, Feb 19, 2018 at 9:32 PM, Les Ginsberg (ginsberg) < > [email protected]> wrote: > >> I am very sympathetic to doing =E2=80=9Cas little as possible=E2=80=9D g= iven we are >> talking about documents which are going through final reviews. >> >> At the same time, I think defining the authoritative source for algorith= m >> values is important. >> >> >> >> I therefore agree w Ice =E2=80=93 let=E2=80=99s keep the current 8 bit a= lgorithm value =E2=80=93 >> but make it clear that the identifiers come from the IGP Registry. >> > > I do not hear from you or Ice a clear technical reason nor willingness to > address the concerns that I raised about the impact > on the use of BIER. > > I see no technical reasons being used to recommend combining the BIER BAR > registry and the IGP Algorithms registry. > > Andrew =E2=80=93 I do not think there is agreement on what the function o= f a =E2=80=9CBAR >> sub-type=E2=80=9D is. Therefore I am not comfortable in adding it to the= drafts. >> >> Certainly this may prove to be useful, but let=E2=80=99s add it when we = know how >> it will be used and how to assign values to it. That requires more >> discussion than can reasonably be had in the current context. >> >> >> >> Tony / Alia =E2=80=93 the argument that 256 algorithm values is not enou= gh for >> all use cases (BIER specific and IGP specific and Babel specific=E2=80= =A6) =E2=80=93 or >> even that 128 is not enough (if we allow the Flex-Algo proposal to reser= ve >> half of the space) =E2=80=93 simply does not ring true to me. >> >> If I waited for you to buy me a beer when we reached 10 algorithms I >> likely will go thirsty for a very long time. >> > > It is fascinating to see that you believe me too busy to keep up on the > side discussions happening - or perhaps merely too distracted to > recall the emails discussing acquiring half of the IGP Algorithm space fo= r > flex-algo. I do talk to my WG Chairs. > > Please engage substantively with technical arguments. If you have them, > you are more than capable of representing them > accurately. > > So Option E seems best to me. >> > > That was not part of my listed options. > > Regards, > Alia > > >> >> Les >> >> >> >> *From:* BIER [mailto:[email protected]] *On Behalf Of *Tony >> Przygienda >> *Sent:* Monday, February 19, 2018 6:20 PM >> *To:* Dolganow, Andrew (Nokia - SG/Singapore) <[email protected]= > >> *Cc:* BIER WG <[email protected]>; IJsbrand Wijnands <[email protected]>; >> [email protected] list <[email protected]> >> *Subject:* Re: [Bier] [Isis-wg] BAR field length in >> draft-ietf-bier-isis-extensions and draft-ietf-bier-ospf-extensions >> >> >> >> My reaction to AD's options: >> >> IF you prefer or can accept the current status, but think there should b= e >> an IANA registry >> as is usual for managing code-points, please say so. No more >> justification is needed. >> >> >> >> >> +1 to this option, i.e. current status with IANA BIER BAR registry. >> >> I think we have a clear and current case which is anchored already in th= e >> architecture RFC as section 6.9 >> >> The draft https://tools.ietf.org/html/draft-zzhang-bier-algorithm-00 >> goes into more detail in this respect and I hope the draft being adopted >> and at least a single BAR value being assigned to deal with brownfield >> deployments today where not all routers support BIER. This clearly >> necessitates a BIER BAR registry. >> >> >> IF you prefer Option B, C, and/or D, please say so with your >> explanation. More technical depth than "'we might need it" would be >> helpful; the availability of sub-TLVs already >> provides future proofing. >> >> >> +2 for Option B). Albeit we can meet future use cases with BAR subtype >> being a sub-TLV a bar type/bar subtype 16 bits field (subtype with or >> without registry and of course we can name those things differently) all >> sub-TLVs in IGPs are traditionally =E2=80=9Coptional=E2=80=9D, i.e. addi= ng sub-TLVs later >> _may_ cause backwards compatibility problems. Defining the subtype toda= y >> will allow us to specify that only type/subtype 0/0 is well defined & an= y >> unknown type/subtype combination must be avoided. The subtype will allow >> for BAR 0 or future BAR types to understand that subtype is in a sense a >> =E2=80=9Cmandatory sub-TLV=E2=80=9D and the routers sending out such sub= type must be >> avoided, even if the type itself is known. Several possibilities come t= o >> mind immediately such as using Unicast IGP Algorithm Registry as subtype >> for certain BAR values or accommodate interesting, future work like Flex >> Algo into BIER right after IGP RFCs are available which IMO would presen= t a >> very beneficial future direction for BIER technology cleanly governed by= a >> BIER BAR registry. >> >> PS: I think we should control the urges of workgroup participants to >> explore the number of letters in the roman alphabet that we can use to >> introduce their preferred solutions if we want to get to some kind of >> consensus on this thread. >> >> PPS: Option E has been discussed in the last 16-bit thread to the point >> of logical conclusion of a "all routing protocols under the sun algorith= m >> registry" and found to be a rathole I thought ... >> >> >> >> >> >> >> On Mon, Feb 19, 2018 at 6:09 PM, Dolganow, Andrew (Nokia - SG/Singapore)= < >> [email protected]> wrote: >> >> All, >> >> >> >> As we discussed here (as a WG) and in this topic: >> >> - We need to have ability to define way for independent BIER >> computation algorithms (for BIER specific computations or other use c= ases, >> some of which Alia highlighted in her email below) >> - We want to have extensibility to use other non-BIER specific >> algorithms (as others brought up) >> >> >> >> The original draft can be argued not to provide both of those >> capabilities, and thus Option A below (marked as Current status) really >> just defers the issue. I find Option E that Ice added also >> counterproductive as it eliminates the top use case above. Thus we reall= y >> left with options B, C, D as a compromise. From those, Option B seems to= me >> the best: >> >> - It meets the requirements above >> - It allows a clean implementation (as opposed to Option C which is a >> bit more kludgy). Thanks to a sub-TLV defining what BAR field carries= =E2=80=93 a >> BIER-specific algorithm defined in BIER specific registry (a registry= that >> should be BIER specific, regardless of IGP used), or something else t= o meet >> needs expressed by others, we meet the requirements from those who wa= nted >> to change the Current status >> >> >> >> Option C/D are acceptable alternatives; however, Option B seems >> technically cleanest, most flexible, and meeting all requirements. >> >> >> >> Andrew >> >> >> >> >> >> *From: *Isis-wg <[email protected]> on behalf of Alia Atlas < >> [email protected]> >> *Date: *Tuesday, February 20, 2018 at 12:05 PM >> *To: *"(Ice) IJsbrand Wijnands" <[email protected]> >> *Cc: *BIER WG <[email protected]>, "[email protected] list" <[email protected]= > >> *Subject: *Re: [Isis-wg] [Bier] BAR field length in >> draft-ietf-bier-isis-extensions and draft-ietf-bier-ospf-extensions >> >> >> >> Ice, >> >> >> >> On Mon, Feb 19, 2018 at 7:57 PM, IJsbrand Wijnands <[email protected]> wrote= : >> >> Alia, >> >> >> >> I appreciate that you have finally decided to discuss this on the BIER >> mailing list. >> >> >> I know that there are individual drafts draft-ppsenak-ospf-sr-flex-algo-= 00 >> and draft-hegdeppsenak-isis-sr-flex-algo-02. >> I see a bit of discussion on the is-is mailing list and at IETF 100, but= , >> of course, no WG adoption. >> >> I see BIER as a fundamental technology that can be used in different >> situations. For instance, there is not merely >> discussion of how Babel and BIER could interact - but actual code (thank= s >> Sandy!); of course, that is not a WG-adopted >> draft yet either, so this is merely a thought experiment example. How d= o >> the different algorithms >> work for an IGP that isn't link-state? What about the ideas around >> using BIER with caches? Are there issues there? >> What about algorithms that make sense for BIER or multicast - but not fo= r >> unicast? >> >> IANA registries are not price prohibitive. Why would we tie BIER to the >> link-state IGP registry? >> >> >> >> We are talking about what needs to be advertised in OSPF and ISIS in >> order to select the BIER underlay. We are not discussing Babel or any ot= her >> candidate underlay technologies for BIER. Moreover, we are not limiting = any >> new innovation with BIER regarding the underlay. This discussion is >> strictly related to the drafts in the title. >> >> >> >> I do not hear you making a technical argument. >> >> >> >> This is an architectural argument! >> >> >> >> An architectural argument can't also limit itself to the drafts in the >> title. >> >> >> >> If it sounded like the IANA registry was suggested as separate for BIER >> OSPF and BIER ISIS, then your attempt to reframe the conversation might= be >> reasonable. Let me clarify - I see no current reason for an OSPF BAR >> registry and an ISIS BAR registry; it would just be a BAR registry. Per= haps >> >> that clarification is a good reason to get the IANA registry included in >> the next update? >> >> >> >> The routing layer is separate from the BIER layer. The BAR is for the >> BIER layer. >> >> >> >> Regards, >> >> Alia >> >> >> >> >> >> Hope this clarifies, >> >> >> >> Thx, >> >> >> >> Ice. >> >> >> >> >> Regards, >> Alia >> >> >> On Mon, Feb 19, 2018 at 7:03 PM, IJsbrand Wijnands <[email protected]> wrote= : >> Hi Alia, >> >> There is one more option that I think is not fully covered from the >> choice of options related to getting a registry. >> >> The topic of the discussion is what information we need to pass in the >> IGP in order for BIER to select the correct underlay. What identifies th= e >> underlay is really what ever information is needed to select the Table >> (MT-ID) and Algorithm. An example of Algorithm work that is going on is >> Flex-Algo. My preferred option is to align with what ever the IGPs are >> using to identify the Algorithm. >> >> Option E: Change BAR into =E2=80=9CIGP Algorithm=E2=80=9D registry as do= cumented in >> https://www.iana.org/assignments/igp-parameters/igp- >> parameters.xhtml#igp-algorithm-types >> >> Thx, >> >> Ice. >> >> On 19 Feb 2018, at 13:51, Alia Atlas <[email protected]> wrote: >> >> As the Sponsoring AD for draft-ietf-bier-isis-extensions-07 and >> draft-ietf-bier-ospf-extensions-12, I have been following the discussion >> on the mailing list with interest. >> >> I have not seen clear consensus for any change. >> >> Let me be clear on what I see the options are from the discussion. Then >> I'll elaborate >> a bit on how you can express your perspective most usefully. >> >> 1) Current Status: Bier Algorithm (BAR) field is 8 bits. Currently, >> only value 0 is specified. The drafts do not have an IANA registry - wi= th >> the expectation that one will be created when the first additional use i= s >> clear. It is possible that there will be objections from the IESG to >> progressing without an IANA registry. Given the lack of clarity for fut= ure >> use-cases and after discussion, I decided not to force one after my AD >> review - but I will not push back against having a BIER IANA registry if >> raised by others. >> >> 2) Option B: Add a BAR sub-type of 8 bits. This would modify the >> current TLVs. >> Define an IANA registry for the BAR type. The meaning of the BAR >> sub-type derives >> from the BAR type. We can debate over the registration policy for >> the BAR type. >> >> 3) Option C: Change the BAR field to be 16 bits and define an IANA >> registry. Part of the range can be FCFS with Expert Review, part can be >> Specification Required, and part can be IETF Consensus. >> >> 4) Option D: At some point in the future, if there is an actual >> understood and documented need, a BAR sub-type could be added a sub-TLV. >> The length of the BAR sub-type could be determined when the sub-TLV is >> defined. >> >> Given >> >> a) option D exists >> b) there is currently only one defined value for BAR >> c) I do not see strong consensus for change to one particular other >> option >> >> I see no current reason for a change and I certainly see absolutely no >> reason for >> a delay in progressing the documents. >> >> I do want to be clear about what the WG wants to do on this issue. >> Therefore, here is >> my following request. >> >> Please send your feedback to the mailing list as follows: >> >> IF you prefer or can accept the current status, please say so. No more >> justification >> or reasoning is required. I just don't want the bulk of folks who are >> content to be >> overlooked by those suggesting change. >> >> IF you prefer or can accept the current status, but think there should b= e >> an IANA registry >> as is usual for managing code-points, please say so. No more >> justification is needed. >> >> IF you prefer Option B, C, and/or D, please say so with your >> explanation. More technical depth than "'we might need it" would >> be helpful; the availability of sub-TLVs already >> provides future proofing. >> >> IF you have a clear technical objection to why the Current Status is not >> acceptable, >> please express that - with clear details. >> >> IF you feel that additional code-points should be allocated in a BAR IAN= A >> Registry or >> have thoughts on the appropriate policy, please say so with your >> explanation for what >> those should be. >> >> Unless I see clear and strong consensus for something other than the >> Current Status, >> that will remain. >> >> IF there is clear and strong consensus for Option B, C, or D, or adding >> an IANA registry with particular values, then it will be possible to hav= e a >> change up through this Weds night - with a 1 week WGLC on that particula= r >> technical change. >> >> My priority is to have the base BIER specifications published as Propose= d >> Standards so that more BIER implementations and deployment can be done. = I >> would like the WG to wrap up the core work (as expressed in the proposed >> recharter) so that you all can look >> at how to use it. >> >> Given this topic was raised last Weds and given that there are no >> technical objections raised to the documents as are, there isn't much ti= me >> - so please just respond to this email ASAP. My deadline for a decision= is >> 6pm EST on Weds. >> >> Regards, >> Alia >> >> _______________________________________________ >> BIER mailing list >> [email protected] >> https://www.ietf.org/mailman/listinfo/bier >> >> >> >> <PastedGraphic-6.png> >> >> >> >> [image: cid:[email protected]] >> >> >> >> >> >> >> _______________________________________________ >> BIER mailing list >> [email protected] >> https://www.ietf.org/mailman/listinfo/bier >> >> >> >> _______________________________________________ >> Isis-wg mailing list >> [email protected] >> https://www.ietf.org/mailman/listinfo/isis-wg >> >> > --001a113cd1f8ed32b105659c5c6e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"ltr">Les,<div><br></div><div>Let me clarify - rereading your em= ail again where you clearly suggest using 128 values for=C2=A0</div><div>fl= ex-algo.=C2=A0 =C2=A0(I've been working all evening - except for duckin= g out for that 10 minutes to</div><div>chase the kids to bed in the middle = of that last email.)</div><div><br></div><div>a) I found the need for an SR= Algorithm field to be limited, given our experience with different</div><d= iv>IGP algorithms.=C2=A0 I would also be stunned if we got to 10 different = algorithms.</div><div><br></div><div>b) Having unclear semantics because an= algorithm only makes sense for BIER or only makes</div><div>sense for an I= GP-specific technology is not good.</div><div><br></div><div>c) Adding the = complexity to consider how and when to use an algorithm or similar new feat= ure</div><div>that makes sense for a link-state IGP - to then also consider= if it can apply to BIER and if it can</div><div>work in non-link-state IGP= s - would only make sense if it were balanced by an equal technical</div><d= iv>benefit.</div><div><br></div><div>These drafts were WGLCed in June - wit= h no BAR.=C2=A0 In October, I did not just insist on a IANA=C2=A0</div><div= >registry for the BAR in the BIER registries - because it was claimed that = would let the documents</div><div>progress and not force to an assumption.= =C2=A0 I regret that decision - given the poor efforts to force</div><div>a= registry merge.</div><div><br></div><div>IF you and Ice truly believe that= this is the technically correct thing to do, then you would make</div><div= >substantive technical arguments instead of this sophistry.</div><div><br><= /div><div>I have given several more chances to allow this WG to discuss whe= ther any changes are needed</div><div>or are desirable. I am pushing for te= chnical discussion.=C2=A0=C2=A0</div><div><br></div><div>I am quite disappo= inted in the level of discourse; the BIER-WG has traditionally worked very<= /div><div>collegially with substantive technical points.</div><div><br></di= v><div>Regards,</div><div>Alia</div></div><div class=3D"gmail_extra"><br><d= iv class=3D"gmail_quote">On Mon, Feb 19, 2018 at 10:11 PM, Alia Atlas <span= dir=3D"ltr"><<a href=3D"mailto:[email protected]" target=3D"_blank">aka= [email protected]</a>></span> wrote:<br><blockquote class=3D"gmail_quote" s= tyle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div= dir=3D"ltr">Les,<div><br></div><div><div class=3D"gmail_extra"><div class= =3D"gmail_quote"><span class=3D"">On Mon, Feb 19, 2018 at 9:32 PM, Les Gins= berg (ginsberg) <span dir=3D"ltr"><<a href=3D"mailto:[email protected]"= target=3D"_blank">[email protected]</a>></span> wrote:<br><blockquote = class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid= ;padding-left:1ex"> <div lang=3D"EN-US" link=3D"blue" vlink=3D"purple"> <div class=3D"m_619673016967102960m_5957554242327931263WordSection1"> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri",sans-serif;color:#1f497d">I am very sympathetic to doing =E2=80= =9Cas little as possible=E2=80=9D given we are talking about documents whic= h are going through final reviews.<u></u><u></u></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri",sans-serif;color:#1f497d">At the same time, I think defining th= e authoritative source for algorithm values is important.<u></u><u></u></sp= an></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri",sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri",sans-serif;color:#1f497d">I therefore agree w Ice =E2=80=93 let= =E2=80=99s keep the current 8 bit algorithm value =E2=80=93 but make it cle= ar that the identifiers come from the IGP Registry.</span><span style=3D"co= lor:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:11pt">=C2=A0</s= pan></p></div></div></blockquote><div><br></div></span><div>I do not hear f= rom you or Ice a clear technical reason nor willingness to address the conc= erns that I raised about the impact</div><div>on the use of BIER.=C2=A0</di= v><div><br></div><div>I see no technical reasons being used to recommend co= mbining the BIER BAR registry and the IGP Algorithms registry.</div><span c= lass=3D""><div><br></div><blockquote class=3D"gmail_quote" style=3D"margin:= 0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang=3D"EN-US"= link=3D"blue" vlink=3D"purple"><div class=3D"m_619673016967102960m_5957554= 242327931263WordSection1"><p class=3D"MsoNormal"><span style=3D"font-size:1= 1.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u></sp= an></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri",sans-serif;color:#1f497d">Andrew =E2=80=93 I do not think there= is agreement on what the function of a =E2=80=9CBAR sub-type=E2=80=9D is. = Therefore I am not comfortable in adding it to the drafts.<u></u><u></u></s= pan></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri",sans-serif;color:#1f497d">Certainly this may prove to be useful= , but let=E2=80=99s add it when we know how it will be used and how to assi= gn values to it. That requires more discussion than can reasonably be had in the current context.<u></u><u></u></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri",sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri",sans-serif;color:#1f497d">Tony / Alia =E2=80=93 the argument th= at 256 algorithm values is not enough for all use cases (BIER specific and = IGP specific and Babel specific=E2=80=A6) =E2=80=93 or even that 128 is not enough (if we allow the Flex-Algo proposal to reserve half of the spac= e) =E2=80=93 simply does not ring true to me.<u></u><u></u></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri",sans-serif;color:#1f497d">If I waited for=C2=A0 you to buy=C2= =A0 me a beer when we reached 10 algorithms I likely will go thirsty for a = very long time.</span><span style=3D"color:rgb(31,73,125);font-family:Calib= ri,sans-serif;font-size:11pt">=C2=A0</span></p></div></div></blockquote><di= v><br></div></span><div>It is fascinating to see that you believe me too bu= sy to keep up on the side discussions happening - or perhaps merely too dis= tracted to</div><div>recall the emails discussing acquiring half of the IGP= Algorithm space for flex-algo.=C2=A0 I do talk to my WG Chairs.</div><div>= <br></div><div>Please engage substantively with technical arguments.=C2=A0 = If you have them, you are more than capable of representing them</div><div>= accurately.</div><span class=3D""><div><br></div><blockquote class=3D"gmail= _quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:= 1ex"><div lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><div class=3D"m_619= 673016967102960m_5957554242327931263WordSection1"><p class=3D"MsoNormal"><s= pan style=3D"font-size:11.0pt;font-family:"Calibri",sans-serif;co= lor:#1f497d"><u></u></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri",sans-serif;color:#1f497d">So Option E seems best to me.</span><= /p></div></div></blockquote><div><br></div></span><div>That was not part of= my listed options.</div><div>=C2=A0</div><div>Regards,</div><div>Alia</div= ><div><br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8e= x;border-left:1px #ccc solid;padding-left:1ex"><div><div class=3D"h5"><div = lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><div class=3D"m_6196730169671= 02960m_5957554242327931263WordSection1"><p class=3D"MsoNormal"><span style= =3D"font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f49= 7d"><u></u><u></u></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri",sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri",sans-serif;color:#1f497d">=C2=A0=C2=A0 Les<u></u><u></u></span>= </p> <p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:"Ca= libri",sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p> <div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in = 4.0pt"> <div> <div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in = 0in 0in"> <p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:"= ;Calibri",sans-serif">From:</span></b><span style=3D"font-size:11.0pt;= font-family:"Calibri",sans-serif"> BIER [mailto:<a href=3D"mailto= :[email protected]" target=3D"_blank">[email protected]</a>] <b>On Behalf Of </b>Tony Przygienda<br> <b>Sent:</b> Monday, February 19, 2018 6:20 PM<br> <b>To:</b> Dolganow, Andrew (Nokia - SG/Singapore) <<a href=3D"mailto:an= [email protected]" target=3D"_blank">[email protected]</a>>= ;<br> <b>Cc:</b> BIER WG <<a href=3D"mailto:[email protected]" target=3D"_blank">b= [email protected]</a>>; IJsbrand Wijnands <<a href=3D"mailto:[email protected]= " target=3D"_blank">[email protected]</a>>; <a href=3D"mailto:[email protected]= rg" target=3D"_blank">[email protected]</a> list <<a href=3D"mailto:isis-= [email protected]" target=3D"_blank">[email protected]</a>><br> <b>Subject:</b> Re: [Bier] [Isis-wg] BAR field length in draft-ietf-bier-is= is-extension<wbr>s and draft-ietf-bier-ospf-extension<wbr>s<u></u><u></u></= span></p> </div> </div><div><div class=3D"m_619673016967102960h5"> <p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p> <div> <div> <div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">My reaction to AD'= ;s options: <u></u> <u></u></p> <blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i= n 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in"> <p class=3D"MsoNormal">IF you prefer or can accept the current status, but = think there should be an IANA registry<br> as is usual for managing code-points, please say so.=C2=A0 No more justific= ation is needed.<br> =C2=A0<u></u><u></u></p> </blockquote> <div> <p class=3D"MsoNormal">=C2=A0<u></u><u></u></p> </div> <p class=3D"MsoNormal">+1 to this option, i.e. current status with IANA BIE= R BAR registry. <br> =C2=A0<br> I think we have a clear and current case which is anchored already in the a= rchitecture RFC as section 6.9<br> =C2=A0<br> The draft <a href=3D"https://tools.ietf.org/html/draft-zzhang-bier-algorith= m-00" target=3D"_blank">https://tools.ietf.org/html/dr<wbr>aft-zzhang-bier-= algorithm-00</a> goes into more detail in this respect and I hope the draft= being adopted and at least a single BAR value being assigned to deal with brownfield deployments today where not all routers support BI= ER.=C2=A0 This clearly necessitates a BIER BAR registry. <br> =C2=A0<u></u><u></u></p> <blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i= n 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in"> <p class=3D"MsoNormal">IF you prefer Option B, C, and/or D, please say so w= ith your explanation.=C2=A0 More technical depth than "'we might n= eed it" would be helpful; the availability of sub-TLVs already<br> provides future proofing.<u></u><u></u></p> </blockquote> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">=C2=A0<br> +2 for Option B). Albeit we can meet future use cases with BAR subtype bein= g a sub-TLV a bar type/bar subtype 16 bits field (subtype with or without r= egistry and of course we can name those things differently) all sub-TLVs in= IGPs are traditionally =E2=80=9Coptional=E2=80=9D, i.e. adding sub-TLVs later _may_ cause backwards compatibility problems.= =C2=A0 Defining the subtype today will allow us to specify that only type/s= ubtype 0/0 is well defined & any unknown type/subtype combination must = be avoided. The subtype will allow for BAR 0 or future BAR types to understand that subtype is in a sense a =E2=80=9C= mandatory sub-TLV=E2=80=9D and the routers sending out such subtype must be= avoided, even if the type itself is known.=C2=A0 Several possibilities com= e to mind immediately such as using Unicast IGP Algorithm Registry as subtype for certain BAR values or accommodate interesting, fut= ure work like Flex Algo into BIER right after IGP RFCs are available which = IMO would present a very beneficial future direction for BIER technology cl= eanly governed by a BIER BAR registry. <u></u><u></u></p> </div> <p class=3D"MsoNormal">PS: I think we should control the urges of workgroup= participants to explore the number of letters in the roman alphabet that w= e can use to introduce their preferred solutions if we want to get to some = kind of consensus on this thread. <u></u><u></u></p> </div> <p class=3D"MsoNormal">PPS: Option E has been discussed in the last 16-bit = thread to the point of logical conclusion of a "all routing protocols = under the sun algorithm registry" and found to=C2=A0 be a rathole I th= ought ... <u></u><u></u></p> <div> <div> <p class=3D"MsoNormal">=C2=A0<br> =C2=A0<u></u><u></u></p> </div> </div> </div> <div> <p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p> <div> <p class=3D"MsoNormal">On Mon, Feb 19, 2018 at 6:09 PM, Dolganow, Andrew (N= okia - SG/Singapore) <<a href=3D"mailto:[email protected]" targe= t=3D"_blank">[email protected]</a>> wrote:<u></u><u></u></p> <blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i= n 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in"> <div> <div> <p class=3D"MsoNormal">All,<span lang=3D"EN-CA"><u></u><u></u></span></p> <p class=3D"MsoNormal">=C2=A0<span lang=3D"EN-CA"><u></u><u></u></span></p> <p class=3D"MsoNormal">As we discussed here (as a WG) and in this topic:<sp= an lang=3D"EN-CA"><u></u><u></u></span></p> <ul type=3D"disc"> <li class=3D"MsoNormal"> We need to have ability to define way for independent BIER computation algo= rithms (for BIER specific computations or other use cases, some of which Al= ia highlighted in her email below)<span lang=3D"EN-CA"><u></u><u></u></span= ></li><li class=3D"MsoNormal"> We want to have extensibility to use other non-BIER specific algorithms (as= others brought up)<span lang=3D"EN-CA"><u></u><u></u></span></li></ul> <p class=3D"MsoNormal">=C2=A0<span lang=3D"EN-CA"><u></u><u></u></span></p> <p class=3D"MsoNormal">The original draft can be argued not to provide both= of those capabilities, and thus Option A below (marked as Current status) = really just defers the issue. I find Option E that Ice added also counterproductive as it eliminates the top use case above. = Thus we really left with options B, C, D as a compromise. From those, Optio= n B seems to me the best:<span lang=3D"EN-CA"><u></u><u></u></span></p> <ul type=3D"disc"> <li class=3D"MsoNormal"> It meets the requirements above<span lang=3D"EN-CA"><u></u><u></u></span></= li><li class=3D"MsoNormal"> It allows a clean implementation (as opposed to Option C which is a bit mor= e kludgy). Thanks to a sub-TLV defining what BAR field carries =E2=80=93 a = BIER-specific algorithm defined in BIER specific registry (a registry that = should be BIER specific, regardless of IGP used), or something else to meet needs expressed by others, we meet the re= quirements from those who wanted to change the Current status<span lang=3D"= EN-CA"><u></u><u></u></span></li></ul> <p class=3D"MsoNormal">=C2=A0<span lang=3D"EN-CA"><u></u><u></u></span></p> <p class=3D"MsoNormal">Option C/D are acceptable alternatives; however, Opt= ion B seems technically cleanest, most flexible, and meeting all requiremen= ts.<span lang=3D"EN-CA"><u></u><u></u></span></p> <p class=3D"MsoNormal">=C2=A0<span lang=3D"EN-CA"><u></u><u></u></span></p> <p class=3D"MsoNormal">Andrew<span lang=3D"EN-CA"><u></u><u></u></span></p> <p class=3D"MsoNormal">=C2=A0<span lang=3D"EN-CA"><u></u><u></u></span></p> <p class=3D"MsoNormal">=C2=A0<span lang=3D"EN-CA"><u></u><u></u></span></p> <div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in = 0in 0in"> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <b><span lang=3D"EN-CA" style=3D"color:black">From: </span></b><span lang= =3D"EN-CA" style=3D"color:black">Isis-wg <<a href=3D"mailto:isis-wg-boun= [email protected]" target=3D"_blank">[email protected]</a>> on behalf = of Alia Atlas <<a href=3D"mailto:[email protected]" target=3D"_blank">ak= [email protected]</a>><br> <b>Date: </b>Tuesday, February 20, 2018 at 12:05 PM<br> <b>To: </b>"(Ice) IJsbrand Wijnands" <<a href=3D"mailto:ice@ci= sco.com" target=3D"_blank">[email protected]</a>><br> <b>Cc: </b>BIER WG <<a href=3D"mailto:[email protected]" target=3D"_blank">b= [email protected]</a>>, "<a href=3D"mailto:[email protected]" target=3D"_= blank">[email protected]</a> list" <<a href=3D"mailto:[email protected]= rg" target=3D"_blank">[email protected]</a>><br> <b>Subject: </b>Re: [Isis-wg] [Bier] BAR field length in draft-ietf-bier-is= is-extension<wbr>s and draft-ietf-bier-ospf-extension<wbr>s</span><span lan= g=3D"EN-CA"><u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <a name=3D"m_619673016967102960_m_5957554242327931263_m_3961924973956221855= __MailOriginalBody"><span lang=3D"EN-CA">Ice,</span></a><span lang=3D"EN-CA= "><u></u><u></u></span></p> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> <div> <div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">On Mon, Feb 19, 2018 at 7:57 PM, IJsbrand Wijnands <= ;<a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]</a>> w= rote:<u></u><u></u></span></p> <blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i= n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-= bottom:5.0pt"> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">Alia, <u></u><u></u></span></p> <div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt;margin-left:.5in"> <span lang=3D"EN-CA"><u></u>=C2=A0<u></u></span></p> <blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt"> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">I appreciate that you have finally decided to discuss = this on the BIER mailing list.<u></u><u></u></span></p> </blockquote> <blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt"> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA"><br> I know that there are individual drafts draft-ppsenak-ospf-sr-flex-alg<wbr>= o-00 =C2=A0and =C2=A0draft-hegdeppsenak-isis-sr-fl<wbr>ex-algo-02.<br> I see a bit of discussion on the is-is mailing list and at IETF 100, but, o= f course, no WG adoption.<br> <br> I see BIER as a fundamental technology that can be used in different situat= ions.=C2=A0 For instance, there is not merely=C2=A0<br> discussion of how Babel and BIER could interact - but actual code (thanks S= andy!); of course, that is not a WG-adopted<br> draft yet either, so this is merely a thought experiment example.=C2=A0 How= do the different algorithms<br> work for an IGP that isn't link-state? =C2=A0 What about the ideas arou= nd using BIER with caches?=C2=A0 Are there issues there?=C2=A0<br> What about algorithms that make sense for BIER or multicast - but not for u= nicast?<br> <br> IANA registries are not price prohibitive.=C2=A0 Why would we tie BIER to t= he link-state IGP registry?<u></u><u></u></span></p> </blockquote> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">We are talking about what needs to be advertised in OS= PF and ISIS in order to select the BIER underlay. We are not discussing Bab= el or any other candidate underlay technologies for BIER. Moreover, we are = not limiting any new innovation with BIER regarding the underlay. This discussion is strictly related to the dr= afts in the title.<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> </div> <blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt"> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">I do not hear you making a technical argument.<u></u><= u></u></span></p> </blockquote> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">This is an architectural argument!<u></u><u></u></span= ></p> </div> </div> </div> </blockquote> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">An architectural argument can't also limit itself = to the drafts in the title.<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">If it sounded like the IANA registry was suggested as = separate for BIER OSPF=C2=A0 and BIER ISIS, then your attempt to reframe th= e conversation might be reasonable.=C2=A0 Let me clarify - I see no current= reason for an OSPF BAR registry and an ISIS BAR registry; it would just be a BAR registry.=C2=A0 Perhaps<u></u><u></u>= </span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">that clarification is a good reason to get the IANA re= gistry included in the next update?<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">The routing layer is separate from the BIER layer.=C2= =A0 The BAR is for the BIER layer.<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">Regards,<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">Alia<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> </div> </div> </div> <blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i= n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-= bottom:5.0pt"> <div> <div> <div> <div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">Hope this clarifies,<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">Thx,<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">Ice.<u></u><u></u></span></p> </div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt;margin-left:.5in"> <span lang=3D"EN-CA"><u></u>=C2=A0<u></u></span></p> <blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt"> <div> <div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt;margin-left:.5in"> <span lang=3D"EN-CA"><br> Regards,<br> Alia<br> <br> <br> On Mon, Feb 19, 2018 at 7:03 PM, IJsbrand Wijnands=C2=A0<<a href=3D"mail= to:[email protected]" target=3D"_blank">[email protected]</a>>=C2=A0wrote<wbr>:<= br> Hi Alia,<br> <br> There is one more option that I think is not fully covered from the choice = of options related to getting a registry.<br> <br> The topic of the discussion is what information we need to pass in the IGP = in order for BIER to select the correct underlay. What=C2=A0identifies the = underlay is really what ever information is needed to select the Table (MT-= ID) and Algorithm. An example of Algorithm=C2=A0work that is going on is Flex-Algo. My preferred option is to align with what e= ver the IGPs are using to identify the Algorithm.<br> <br> Option E: Change BAR into =E2=80=9CIGP Algorithm=E2=80=9D registry as docum= ented in=C2=A0<a href=3D"https://www.iana.org/assignments/igp-parameters/ig= p-parameters.xhtml#igp-algorithm-types" target=3D"_blank">https://www.iana.= org/assign<wbr>ments/igp-parameters/igp-<wbr>parameters.xhtml#igp-algorithm= <wbr>-types</a><br> <br> Thx,<br> <br> Ice.<br> <br> <u></u><u></u></span></p> <blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt"> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">On 19 Feb 2018, at 13:51, Alia Atlas <<a href=3D"ma= ilto:[email protected]" target=3D"_blank">[email protected]</a>> wrote:<= br> <br> As the Sponsoring AD for draft-ietf-bier-isis-extension<wbr>s-07 and draft-= ietf-bier-ospf-extension<wbr>s-12, I have been following the=C2=A0discussio= n on the mailing list with interest.<br> <br> I have not seen clear consensus for any change.<br> <br> Let me be clear on what I see the options are from the discussion.=C2=A0 Th= en I'll elaborate<br> a bit on how you can express your perspective most usefully.<br> <br> 1) Current Status: =C2=A0Bier Algorithm (BAR) field is 8 bits.=C2=A0 Curren= tly, only value 0 is specified.=C2=A0 The drafts do not have an IANA=C2=A0r= egistry - with the expectation that one will be created when the first addi= tional use is clear.=C2=A0 It is possible that there will be=C2=A0objections from the IESG to progressing without an IANA registry.= =C2=A0 Given the lack of clarity for future use-cases and after=C2=A0discus= sion, I decided not to force one after my AD review - but I will not push b= ack against having a BIER IANA registry if raised by=C2=A0others.<br> <br> 2) Option B: =C2=A0Add a BAR sub-type of 8 bits.=C2=A0 This would modify th= e current TLVs.<br> =C2=A0 =C2=A0Define an IANA registry for the BAR type.=C2=A0 The meaning of= the BAR sub-type derives=C2=A0<br> =C2=A0 =C2=A0from the BAR type. =C2=A0 We can debate over the registration = policy for the BAR type.<br> <br> 3) Option C: Change the BAR field to be 16 bits and define an IANA registry= .=C2=A0 Part of the range can be FCFS with Expert Review, part=C2=A0can be = Specification Required, and part can be IETF Consensus.<br> <br> 4) Option D: At some point in the future, if there is an actual understood = and documented need, a BAR sub-type could be added a sub-TLV.=C2=A0 The len= gth of the BAR sub-type could be determined when the sub-TLV is defined.<br= > <br> Given<br> <br> =C2=A0 a) option D exists=C2=A0<br> =C2=A0 b) there is currently only one defined value for BAR<br> =C2=A0 c) I do not see strong consensus for change to one particular other = option<br> <br> I see no current reason for a change and I certainly see absolutely no reas= on for<br> a delay in progressing the documents.<br> <br> I do want to be clear about what the WG wants to do on this issue.=C2=A0 Th= erefore, here is<br> my following request.<br> <br> Please send your feedback to the mailing list as follows:<br> <br> IF you prefer or can accept the current status, please say so.=C2=A0 No mor= e justification<br> or reasoning is required. I just don't want the bulk of folks who are c= ontent to be<br> overlooked by those suggesting change.<br> <br> IF you prefer or can accept the current status, but think there should be a= n IANA registry<br> as is usual for managing code-points, please say so.=C2=A0 No more justific= ation is needed.<br> <br> IF you prefer Option B, C, and/or D, please say so with your explanation.= =C2=A0 More technical depth than "'we might need it" would be= =C2=A0helpful; the availability of sub-TLVs already<br> provides future proofing.<br> <br> IF you have a clear technical objection to why the Current Status is not ac= ceptable,<br> please express that - with clear details.<br> <br> IF you feel that additional code-points should be allocated in a BAR IANA R= egistry or<br> have thoughts on the appropriate policy, please say so with your explanatio= n for what<br> those should be.<br> <br> Unless I see clear and strong consensus for something other than the Curren= t Status,<br> that will remain.<br> <br> IF there is clear and strong consensus for Option B, C, or D, or adding an = IANA registry with particular values, then it will be=C2=A0possible to have= a change up through this Weds night - with a 1 week WGLC on that particula= r technical change.<br> <br> My priority is to have the base BIER specifications published as Proposed S= tandards so that more BIER implementations and deployment=C2=A0can be done.= =C2=A0 I would like the WG to wrap up the core work (as expressed in the pr= oposed recharter) so that you all can look<br> at how to use it.<br> <br> Given this topic was raised last Weds and given that there are no technical= objections raised to the documents as are, there isn't=C2=A0much time = - so please just respond to this email ASAP.=C2=A0 My deadline for a decisi= on is 6pm EST on Weds.<br> <br> Regards,<br> Alia<br> <br> ______________________________<wbr>_________________<br> BIER mailing list<br> <a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]</a><br> <a href=3D"https://www.ietf.org/mailman/listinfo/bier" target=3D"_blank">ht= tps://www.ietf.org/mailman/l<wbr>istinfo/bier</a><u></u><u></u></span></p> </blockquote> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> </div> </div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt;margin-left:.5in"> <span lang=3D"EN-CA"><PastedGraphic-6.png><u></u><u></u></span></p> </blockquote> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> </div> </div> <div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA"><img border=3D"0" width=3D"569" height=3D"278" style= =3D"width:5.927in;height:2.8958in" id=3D"m_619673016967102960m_595755424232= 7931263m_3961924973956221855m_-5507648477373970838BA5F5A7F-F78C-4E62-AC03-0= 8CF6807D053" src=3D"cid:[email protected]" alt=3D"cid:6D5DA0C0= [email protected]"><u></u><u></u></span></p> </div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> </div> </div> </blockquote> </div> <p class=3D"MsoNormal" style=3D"margin-left:.5in"> <span lang=3D"EN-CA">=C2=A0<u></u><u></u></span></p> </div> </div> </div> </div> <p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><br> ______________________________<wbr>_________________<br> BIER mailing list<br> <a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]</a><br> <a href=3D"https://www.ietf.org/mailman/listinfo/bier" target=3D"_blank">ht= tps://www.ietf.org/mailman/l<wbr>istinfo/bier</a><u></u><u></u></p> </blockquote> </div> <p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p> </div> </div></div></div> </div> </div> <br></div></div>______________________________<wbr>_________________<br> Isis-wg mailing list<br> <a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]</a><= br> <a href=3D"https://www.ietf.org/mailman/listinfo/isis-wg" rel=3D"noreferrer= " target=3D"_blank">https://www.ietf.org/mailman/l<wbr>istinfo/isis-wg</a><= br> <br></blockquote></div><br></div></div></div> </blockquote></div><br></div> --001a113cd1f8ed32b105659c5c6e-- --001a113cd1f8ed32b505659c5c6f Content-Type: image/png; name="image001.png" Content-Disposition: inline; filename="image001.png" Content-Transfer-Encoding: base64 Content-ID: <[email protected]> X-Attachment-Id: 3abc88ee6ee9e61_0.0.1 iVBORw0KGgoAAAANSUhEUgAAAjkAAAEWCAYAAACE+YYTAAAKvGlDQ1BJQ0MgUHJvZmlsZQAASImV lwdQk9kWx+/3pYeEFoiAlNCbIL1Kr6H3JiohCSGUEFJQsaEiruCKIiIC6oosVcG10NaCWLCwCCh2 XZBFQV0XC4qi8j7gEd5783bevDNz5/vlzPn+Oefm3pl/ACCNMvj8NFgWgHSeSBDm406LiY2j4YYA GhCAArAFMgymkO8WEhIA/jY+3gXQzPO2yYzW39f915BjsYVMAKAQhBNZQmY6wqeR1cPkC0QAoHKR vPZqEX+GaxFWECANInx2hjlz3DvDiXP8x2xNRJgHwpMA4EkMhoADAAmN5GlZTA6iQ9JB2IzH4vIQ jkDYmZnMYCFcjPCS9PSMGe5A2CDxX3Q4/6aZKNFkMDgSnptlNvCeXCE/jbH2/9yO/x3paeL579BC FilZ4BuGPPWQPatNzfCXMC8xKHieuazZ+llOFvtGzjNT6BE3zyyGp/88i1Mj3eaZIVh4lyuiR8yz 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