Re: [Bier] BAR field length in draft-ietf-bier-isis-extensions and draft-ietf-bier-ospf-extensions

Tony Przygienda <[email protected]> Mon, 19 Feb 2018 18:19:32 -0800
Newsgroups gmane.ietf.isis
Message-ID <CA+wi2hNYM+SW_7JAD-tE9xSJp-FfoKweK8H+H0N0jmEAHpBW+g@mail.gmail.com>
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My reaction to AD's options:

IF you prefer or can accept the current status, but think there should be
> 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 the
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. adding =
sub-TLVs later
_may_ cause backwards compatibility problems.  Defining the subtype today
will allow us to specify that only type/subtype 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=9Cmandatory sub-TLV=E2=80=9D and the routers sending out such subtyp=
e must be
avoided, even if the type itself is known.  Several possibilities come to
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 present 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 algorithm
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 ca=
ses,
>    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 really
> 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 to=
 meet
>    needs expressed by others, we meet the requirements from those who wan=
ted
>    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-0=
0
>  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 (thanks
> Sandy!); of course, that is not a WG-adopted
> draft yet either, so this is merely a thought experiment example.  How do
> the different algorithms
> work for an IGP that isn't link-state?   What about the ideas around usin=
g
> BIER with caches?  Are there issues there?
> What about algorithms that make sense for BIER or multicast - but not for
> 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 orde=
r
> to select the BIER underlay. We are not discussing Babel or any other
> candidate underlay technologies for BIER. Moreover, we are not limiting a=
ny
> 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.  Perh=
aps
>
> 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 choic=
e
> of options related to getting a registry.
>
> The topic of the discussion is what information we need to pass in the IG=
P
> in order for BIER to select the correct underlay. What identifies the
> 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 doc=
umented 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, onl=
y
> value 0 is specified.  The drafts do not have an IANA registry - with the
> expectation that one will be created when the first additional use is
> clear.  It is possible that there will be objections from the IESG to
> progressing without an IANA registry.  Given the lack of clarity for futu=
re
> 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 curren=
t
> 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 th=
e
> 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 understoo=
d
> 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 be
> 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 IANA
> 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 a=
n
> IANA registry with particular values, then it will be possible to have a
> change up through this Weds night - with a 1 week WGLC on that particular
> technical change.
>
> My priority is to have the base BIER specifications published as Proposed
> 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 tim=
e
> - 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
>
>

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<div dir=3D"ltr"><div><div>My reaction to AD&#39;s options: <br><br><blockq=
uote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1p=
x solid rgb(204,204,204);padding-left:1ex">IF you prefer or can accept the =
current status, but think there should be an IANA registry<br>as is usual f=
or managing code-points, please say so.=C2=A0 No more justification is need=
ed.<br>=C2=A0<br></blockquote><div>=C2=A0</div>+1 to this option, i.e. curr=
ent status with IANA BIER BAR registry. <br>=C2=A0<br>I think we have a cle=
ar and current case which is anchored already in the architecture RFC as se=
ction 6.9<br>=C2=A0<br>The draft <a href=3D"https://tools.ietf.org/html/dra=
ft-zzhang-bier-algorithm-00">https://tools.ietf.org/html/draft-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 BIER.=C2=A0 This=
 clearly necessitates a BIER BAR registry. <br>=C2=A0<br><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex">IF you prefer Option B, C, and/or D, pleas=
e say so with your explanation.=C2=A0 More technical depth than &quot;&#39;=
we might need it&quot; would be helpful; the availability of sub-TLVs alrea=
dy<br>provides future proofing.<br></blockquote>=C2=A0<br>+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 co=
urse we can name those things differently) all sub-TLVs in IGPs are traditi=
onally =E2=80=9Coptional=E2=80=9D, i.e. adding sub-TLVs later _may_ cause b=
ackwards compatibility problems.=C2=A0 Defining the subtype today will allo=
w us to specify that only type/subtype 0/0 is well defined &amp; any unknow=
n 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=9Cm=
andatory 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 come=
 to mind immediately such as using Unicast IGP Algorithm Registry as subtyp=
e for certain BAR values or accommodate interesting, future work like Flex =
Algo into BIER right after IGP RFCs are available which IMO would present a=
 very beneficial future direction for BIER technology cleanly governed by a=
 BIER BAR registry. <br><br></div>PS: I think we should control the urges o=
f workgroup participants to explore the number of letters in the roman alph=
abet that we can use to introduce their preferred solutions if we want to g=
et to some kind of consensus on this thread. <br></div>PPS: Option E has be=
en discussed in the last 16-bit thread to the point of logical conclusion o=
f a &quot;all routing protocols under the sun algorithm registry&quot; and =
found to=C2=A0 be a rathole I thought ... <br><div><div>=C2=A0<br>=C2=A0<br=
></div></div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote=
">On Mon, Feb 19, 2018 at 6:09 PM, Dolganow, Andrew (Nokia - SG/Singapore) =
<span dir=3D"ltr">&lt;<a href=3D"mailto:[email protected]" target=
=3D"_blank">[email protected]</a>&gt;</span> wrote:<br><blockquote =
class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid=
;padding-left:1ex">





<div link=3D"blue" vlink=3D"purple" lang=3D"EN-CA">
<div class=3D"m_3961924973956221855WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US">All,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">As we discussed here (as a WG) =
and in this topic:<u></u><u></u></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li class=3D"m_3961924973956221855MsoListParagraph" style=3D"margin-left:0c=
m"><span lang=3D"EN-US">We need to have ability to define way for independe=
nt BIER computation algorithms (for BIER specific computations or other use
 cases, some of which Alia highlighted in her email below)<u></u><u></u></s=
pan></li><li class=3D"m_3961924973956221855MsoListParagraph" style=3D"margi=
n-left:0cm"><span lang=3D"EN-US">We want to have extensibility to use other=
 non-BIER specific algorithms (as others brought up)<u></u><u></u></span></=
li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The original draft can be argue=
d not to provide both of those capabilities, and thus Option A below (marke=
d 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, Option B =
seems to me the best:<u></u><u></u></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li class=3D"m_3961924973956221855MsoListParagraph" style=3D"margin-left:0c=
m"><span lang=3D"EN-US">It meets the requirements above<u></u><u></u></span=
></li><li class=3D"m_3961924973956221855MsoListParagraph" style=3D"margin-l=
eft:0cm"><span lang=3D"EN-US">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 regis=
try (a registry that should be BIER specific, regardless of IGP used), or s=
omething else to meet needs expressed by others, we meet the requirements f=
rom those who wanted to change the Current
 status<u></u><u></u></span></li></ul>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Option C/D are acceptable alter=
natives; however, Option B seems technically cleanest, most flexible, and m=
eeting all requirements.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Andrew<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span style=3D"font-=
size:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">Isis-wg &lt;<a href=
=3D"mailto:[email protected]" target=3D"_blank">isis-wg-bounces@ietf=
.org</a>&gt; on behalf of Alia Atlas &lt;<a href=3D"mailto:[email protected]=
m" target=3D"_blank">[email protected]</a>&gt;<br>
<b>Date: </b>Tuesday, February 20, 2018 at 12:05 PM<br>
<b>To: </b>&quot;(Ice) IJsbrand Wijnands&quot; &lt;<a href=3D"mailto:ice@ci=
sco.com" target=3D"_blank">[email protected]</a>&gt;<br>
<b>Cc: </b>BIER WG &lt;<a href=3D"mailto:[email protected]" target=3D"_blank">b=
[email protected]</a>&gt;, &quot;<a href=3D"mailto:[email protected]" target=3D"_=
blank">[email protected]</a> list&quot; &lt;<a href=3D"mailto:[email protected]=
rg" target=3D"_blank">[email protected]</a>&gt;<br>
<b>Subject: </b>Re: [Isis-wg] [Bier] BAR field length in draft-ietf-bier-is=
is-<wbr>extensions and draft-ietf-bier-ospf-<wbr>extensions<u></u><u></u></=
span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><a name=3D"m_3961924973=
956221855__MailOriginalBody">Ice,<u></u><u></u></a></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
<div><div><div class=3D"h5">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>On Mon, Feb 19, 2=
018 at 7:57 PM, IJsbrand Wijnands &lt;</span><a href=3D"mailto:[email protected]=
m" target=3D"_blank"><span>[email protected]</span><span></span></a><span>&gt;
 wrote:<u></u><u></u></span></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>Alia,
<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><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:36.0pt"><span>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:36.0pt"><span><br>
I know that there are individual drafts draft-ppsenak-ospf-sr-flex-<wbr>alg=
o-00 =C2=A0and =C2=A0draft-hegdeppsenak-isis-sr-<wbr>flex-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&#39;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:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>We are talking ab=
out what needs to be advertised in OSPF and ISIS in order to select the BIE=
R underlay. We are not discussing Babel or any other candidate underlay
 technologies for BIER. Moreover, we are not limiting any new innovation wi=
th BIER regarding the underlay. This discussion is strictly related to the =
drafts in the title.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>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:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>This is an archit=
ectural argument!<u></u><u></u></span></p>
</div>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>An architectural =
argument can&#39;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:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>If it sounded lik=
e the IANA registry was suggested as separate for BIER OSPF=C2=A0 and BIER =
ISIS, then your attempt to reframe the 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:36.0pt"><span>that clarificatio=
n is a good reason to get the IANA registry included in the next update?<u>=
</u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>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:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>Regards,<u></u><u=
></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>Alia<u></u><u></u=
></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>=C2=A0<u></u><u><=
/u></span></p>
</div>
</div></div><blockquote style=3D"border:none;border-left:solid #cccccc 1.0p=
t;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div><div><div class=3D"h5">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>Hope this clarifi=
es,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>Thx,<u></u><u></u=
></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>Ice.<u></u><u></u=
></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><br>
<br>
<u></u><u></u></span></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><br>
Regards,<br>
Alia<br>
<br>
<br>
On Mon, Feb 19, 2018 at 7:03 PM, IJsbrand Wijnands=C2=A0&lt;</span><a href=
=3D"mailto:[email protected]" target=3D"_blank"><span>[email protected]</span><span=
></span></a><span>&gt;=C2=A0<wbr>wrote:<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</span><a href=3D"https://www.iana.org/assignments/igp-parame=
ters/igp-parameters.xhtml#igp-algorithm-types" target=3D"_blank"><span>http=
s://www.iana.org/<wbr>assignments/igp-parameters/<wbr>igp-parameters.xhtml#=
igp-<wbr>algorithm-types</span><span></span></a><span><br>
<br>
Thx,<br>
<br>
Ice.<br>
<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:36.0pt"><span>On 19 Feb 2018, a=
t 13:51, Alia Atlas &lt;</span><a href=3D"mailto:[email protected]" target=
=3D"_blank"><span>[email protected]</span><span></span></a><span>&gt;
 wrote:<br>
<br>
As the Sponsoring AD for draft-ietf-bier-isis-<wbr>extensions-07 and draft-=
ietf-bier-ospf-<wbr>extensions-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&#39;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&#39;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 &quot;&#39;we might need it&quot; 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&#39;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>
</span><a href=3D"mailto:[email protected]" target=3D"_blank"><span>[email protected]=
rg</span><span></span></a><span><br>
</span><a href=3D"https://www.ietf.org/mailman/listinfo/bier" target=3D"_bl=
ank"><span>https://www.ietf.org/mailman/<wbr>listinfo/bier</span><span></sp=
an></a><span><u></u><u></u></span></p>
</blockquote>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-right:0cm;margin-bottom:12.0pt;margi=
n-left:36.0pt">
<span>&lt;PastedGraphic-6.png&gt;<br>
<br>
<u></u><u></u></span></p>
</blockquote>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div></div><div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><img style=3D"wid=
th:5.927in;height:2.8958in" id=3D"m_3961924973956221855m_-55076484773739708=
38BA5F5A7F-F78C-4E62-AC03-08CF6807D053" src=3D"cid:[email protected]=
045B90" alt=3D"cid:[email protected]" border=
=3D"0" height=3D"278" width=3D"569"><u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
</div>
</blockquote>
</div>
<span></span>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
</div>
</div>
</div>
</div>

<br>______________________________<wbr>_________________<br>
BIER mailing list<br>
<a href=3D"mailto:[email protected]">[email protected]</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/bier" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/bier</a><br>
<br></blockquote></div><br></div>

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