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From: Cyril Margaria <cyril.margaria@gmail.com>
Date: Mon, 1 Jul 2019 10:55:46 +0200
Message-ID: <CADOd8-si-1PJ5FSmQ9j38fQGLGyZduJzzqZVXNu_-c4CMqqKEA@mail.gmail.com>
To: Roman Danyliw <rdd@cert.org>
Cc: The IESG <iesg@ietf.org>, draft-ietf-pce-gmpls-pcep-extensions@ietf.org,  pce@ietf.org, pce-chairs@ietf.org
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Subject: Re: [Pce] Roman Danyliw's Discuss on draft-ietf-pce-gmpls-pcep-extensions-14: (with DISCUSS and COMMENT)
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Thanks for the review, please see inline

Best Regards,
Cyril

On Thu, 11 Apr 2019 at 00:13, Roman Danyliw via Datatracker <
noreply@ietf.org> wrote:

> Roman Danyliw has entered the following ballot position for
> draft-ietf-pce-gmpls-pcep-extensions-14: Discuss
>
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut this
> introductory paragraph, however.)
>
>
> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
>
>
> The document, along with other ballot positions, can be found here:
> https://datatracker.ietf.org/doc/draft-ietf-pce-gmpls-pcep-extensions/
>
>
>
> ----------------------------------------------------------------------
> DISCUSS:
> ----------------------------------------------------------------------
>
> (1) Section 6, Per =E2=80=9CThe answer can make that the LSP traverses so=
me
> geographical place known to the attacker where some sniffing devices coul=
d
> be
> installed=E2=80=9D, this is a concern.  Good that it is here.  However, i=
t seems
> like
> the consequences could be even more expansive =E2=80=93 confidentiality (=
sniffing),
> integrity (modifying the traffic) or availability (choose to drop it).
>
>
Would the following change cover those consequences:

NEW:
      PCE Identity theft: A legitimate PCC could request a path for a
      GMPLS LSP to a malicious PCE, which poses as a legitimate PCE.
      The answer can make that the LSP traverses some geographical place
      known to the attacker where confidentiality (sniffing), integrity
      (traffic modification) or availability (traffic drop) attacks
      could be performed by use of an attacker-controlled  device.


(2) Section 6, [RFC8253] is mentioned a few times as having a variety of
> capabilities to mitigate the described threats.  This is the right
> reference.
> However, the current text doesn=E2=80=99t explicitly state whether and ho=
w this
> guidance should be followed (should, must, is recommended?)
>
>
>
Would the following be appropriate?

NEW:
  The document [RFC8253] describes the usage of Transport Layer
   Security (TLS) to enhance PCEP security.  The document describes the
   initiation of the TLS procedures, the TLS handshake mechanisms, the
   TLS methods for peer authentication, the applicable TLS ciphersuites
   for data exchange, and the handling of errors in the security checks.
   PCE and PCC SHOULD use [RFC8253] mechanism to protect against
   malicious PCC and PCE.




> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>
> (1) Section 2.3, Nit (missing commas and periods),
> s/(SDH/SONET, G.709, ATM, MEF etc)/
> (SDH/SONET, G.709, ATM, MEF, etc.)/
>
> (2) In a few section.  Typo (duplicate =E2=80=9Csection Section=E2=80=9D)=
.  Recommend
> global
> s/section Section/Section/g
>
>
Thanks for catching those, I did not find the duplicated against though.


> (3) Section 6.  Duplicate word.  s/against against/against/
>
>
>



> _______________________________________________
> Pce mailing list
> Pce@ietf.org
> https://www.ietf.org/mailman/listinfo/pce
>

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<div dir=3D"ltr"><div dir=3D"ltr">Thanks for the review, please see inline<=
div><br></div><div>Best Regards,=C2=A0</div><div>Cyril</div></div><br><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, 11 Apr =
2019 at 00:13, Roman Danyliw via Datatracker &lt;<a href=3D"mailto:noreply@=
ietf.org">noreply@ietf.org</a>&gt; wrote:<br></div><blockquote class=3D"gma=
il_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,2=
04,204);padding-left:1ex">Roman Danyliw has entered the following ballot po=
sition for<br>
draft-ietf-pce-gmpls-pcep-extensions-14: Discuss<br>
<br>
When responding, please keep the subject line intact and reply to all<br>
email addresses included in the To and CC lines. (Feel free to cut this<br>
introductory paragraph, however.)<br>
<br>
<br>
Please refer to <a href=3D"https://www.ietf.org/iesg/statement/discuss-crit=
eria.html" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/iesg/s=
tatement/discuss-criteria.html</a><br>
for more information about IESG DISCUSS and COMMENT positions.<br>
<br>
<br>
The document, along with other ballot positions, can be found here:<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-pce-gmpls-pcep-exten=
sions/" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/d=
oc/draft-ietf-pce-gmpls-pcep-extensions/</a><br>
<br>
<br>
<br>
----------------------------------------------------------------------<br>
DISCUSS:<br>
----------------------------------------------------------------------<br>
<br>
(1) Section 6, Per =E2=80=9CThe answer can make that the LSP traverses some=
<br>
geographical place known to the attacker where some sniffing devices could =
be<br>
installed=E2=80=9D, this is a concern.=C2=A0 Good that it is here.=C2=A0 Ho=
wever, it seems like<br>
the consequences could be even more expansive =E2=80=93 confidentiality (sn=
iffing),<br>
integrity (modifying the traffic) or availability (choose to drop it).<br>
<br></blockquote><div class=3D"gmail_quote"><br></div>Would the following c=
hange cover those consequences:<br><br>NEW:<br>=C2=A0 =C2=A0 =C2=A0 PCE Ide=
ntity theft: A legitimate PCC could request a path for a<br>=C2=A0 =C2=A0 =
=C2=A0 GMPLS LSP to a malicious PCE, which poses as a legitimate PCE.<br>=
=C2=A0 =C2=A0 =C2=A0 The answer can make that the LSP traverses some geogra=
phical place<br>=C2=A0 =C2=A0 =C2=A0 known to the attacker where confidenti=
ality (sniffing), integrity<br>=C2=A0 =C2=A0 =C2=A0 (traffic modification) =
or availability (traffic drop) attacks<br>=C2=A0 =C2=A0 =C2=A0 could be per=
formed by use of an attacker-controlled=C2=A0 device.=C2=A0<div><br></div><=
div><br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px=
 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
(2) Section 6, [RFC8253] is mentioned a few times as having a variety of<br=
>
capabilities to mitigate the described threats.=C2=A0 This is the right ref=
erence. <br>
However, the current text doesn=E2=80=99t explicitly state whether and how =
this<br>
guidance should be followed (should, must, is recommended?)<br>
<br>
<br></blockquote><div><br></div><div>Would the following be appropriate?<br=
><br>NEW:<br>=C2=A0 The document [RFC8253] describes the usage of Transport=
 Layer<br>=C2=A0 =C2=A0Security (TLS) to enhance PCEP security.=C2=A0 The d=
ocument describes the<br>=C2=A0 =C2=A0initiation of the TLS procedures, the=
 TLS handshake mechanisms, the<br>=C2=A0 =C2=A0TLS methods for peer authent=
ication, the applicable TLS ciphersuites<br>=C2=A0 =C2=A0for data exchange,=
 and the handling of errors in the security checks.<br>=C2=A0 =C2=A0PCE and=
 PCC SHOULD use [RFC8253] mechanism to protect against<br>=C2=A0 =C2=A0mali=
cious PCC and PCE.<br></div><div><br></div><div><br></div><div>=C2=A0</div>=
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
----------------------------------------------------------------------<br>
COMMENT:<br>
----------------------------------------------------------------------<br>
<br>
(1) Section 2.3, Nit (missing commas and periods),<br>
s/(SDH/SONET, G.709, ATM, MEF etc)/<br>
(SDH/SONET, G.709, ATM, MEF, etc.)/<br>
<br>
(2) In a few section.=C2=A0 Typo (duplicate =E2=80=9Csection Section=E2=80=
=9D).=C2=A0 Recommend global<br>
s/section Section/Section/g<br>
<br></blockquote><div><br></div><div>Thanks for catching those, I did not f=
ind the duplicated against though.</div><div>=C2=A0<br></div><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid=
 rgb(204,204,204);padding-left:1ex">
(3) Section 6.=C2=A0 Duplicate word.=C2=A0 s/against against/against/<br>
<br>
<br></blockquote><div><br></div><div><br></div><div>=C2=A0</div><blockquote=
 class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px so=
lid rgb(204,204,204);padding-left:1ex">
_______________________________________________<br>
Pce mailing list<br>
<a href=3D"mailto:Pce@ietf.org" target=3D"_blank">Pce@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/pce" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/pce</a><br>
</blockquote></div></div>

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From: Cyril Margaria <cyril.margaria@gmail.com>
Date: Mon, 1 Jul 2019 10:58:24 +0200
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To: Suresh Krishnan <suresh@kaloom.com>
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Subject: Re: [Pce] Suresh Krishnan's No Objection on draft-ietf-pce-gmpls-pcep-extensions-14: (with COMMENT)
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Thanks for the review,

please see inline

Best regards,
Cyril Margaria


On Tue, 9 Apr 2019 at 20:41, Suresh Krishnan via Datatracker <
noreply@ietf.org> wrote:

> Suresh Krishnan has entered the following ballot position for
> draft-ietf-pce-gmpls-pcep-extensions-14: No Objection
>
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut this
> introductory paragraph, however.)
>
>
> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
>
>
> The document, along with other ballot positions, can be found here:
> https://datatracker.ietf.org/doc/draft-ietf-pce-gmpls-pcep-extensions/
>
>
>
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>
> * Section 2.5.2
>
> "In this object type the order of the TLVs MUST be followed according to
> the
> object type definition."
>
> Not sure what this means. Can you clarify?
>
>
[MC] This refers to Section 2.5.1 Generalized Endpoint Object Type,
the TLV ordering matters (for a given object type).
A better wording could be as follows:
NEW:
All endpoint TLVs have the standard PCEP TLV header as defined in
   [RFC5440] section 7.1.  For the Generalized Endpoint Object Type the
   TLVs MUST follow the ordering defined in Section 2.5.1.


> * Section 2.7
>
> "C-Type (8 bits): the C-Type of the included Label Object as defined in
> [RFC3471]."
>
> I could not find any references to C-Types in RFC3471. Shouldn't you be
> referring to RFC3473 instead? I have a similar comment for the Label field.
>
>
[MC] The reference should indeed be RFC3473 for the C-Type. The Label field
is technology-dependent and defined in RFC3471, the per-technology labels
are defined in the technology-specific RFCs.



>
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<div dir=3D"ltr"><div dir=3D"ltr">Thanks for the review,=C2=A0<div><br></di=
v><div>please see inline</div><div><br></div><div>Best regards,=C2=A0</div>=
<div>Cyril Margaria<br><br></div></div><br><div class=3D"gmail_quote"><div =
dir=3D"ltr" class=3D"gmail_attr">On Tue, 9 Apr 2019 at 20:41, Suresh Krishn=
an via Datatracker &lt;<a href=3D"mailto:noreply@ietf.org">noreply@ietf.org=
</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:=
0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">=
Suresh Krishnan has entered the following ballot position for<br>
draft-ietf-pce-gmpls-pcep-extensions-14: No Objection<br>
<br>
When responding, please keep the subject line intact and reply to all<br>
email addresses included in the To and CC lines. (Feel free to cut this<br>
introductory paragraph, however.)<br>
<br>
<br>
Please refer to <a href=3D"https://www.ietf.org/iesg/statement/discuss-crit=
eria.html" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/iesg/s=
tatement/discuss-criteria.html</a><br>
for more information about IESG DISCUSS and COMMENT positions.<br>
<br>
<br>
The document, along with other ballot positions, can be found here:<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-pce-gmpls-pcep-exten=
sions/" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/d=
oc/draft-ietf-pce-gmpls-pcep-extensions/</a><br>
<br>
<br>
<br>
----------------------------------------------------------------------<br>
COMMENT:<br>
----------------------------------------------------------------------<br>
<br>
* Section 2.5.2<br>
<br>
&quot;In this object type the order of the TLVs MUST be followed according =
to the<br>
object type definition.&quot;<br>
<br>
Not sure what this means. Can you clarify?<br>
<br></blockquote><div><br></div><div>[MC] This refers to Section 2.5.1 Gene=
ralized Endpoint Object Type,<br>the TLV ordering matters (for a given obje=
ct type).<br>A better wording could be as follows:<br>NEW:<br>All endpoint =
TLVs have the standard PCEP TLV header as defined in<br>=C2=A0 =C2=A0[RFC54=
40] section 7.1.=C2=A0 For the Generalized Endpoint Object Type the<br>=C2=
=A0 =C2=A0TLVs MUST follow the ordering defined in Section 2.5.1.<br></div>=
<div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px =
0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
* Section 2.7<br>
<br>
&quot;C-Type (8 bits): the C-Type of the included Label Object as defined i=
n<br>
[RFC3471].&quot;<br>
<br>
I could not find any references to C-Types in RFC3471. Shouldn&#39;t you be=
<br>
referring to RFC3473 instead? I have a similar comment for the Label field.=
<br>
<br></blockquote><div><br>[MC] The reference should indeed be RFC3473 for t=
he C-Type. The Label field<br>is technology-dependent and defined in RFC347=
1, the per-technology labels are defined in the technology-specific RFCs.<b=
r></div><div><br></div><div>=C2=A0</div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pad=
ding-left:1ex">
<br>
_______________________________________________<br>
Pce mailing list<br>
<a href=3D"mailto:Pce@ietf.org" target=3D"_blank">Pce@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/pce" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/pce</a><br>
</blockquote></div></div>

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Subject: Re: [Pce] Benjamin Kaduk's Discuss on draft-ietf-pce-gmpls-pcep-extensions-14: (with DISCUSS and COMMENT)
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Hi Ben,

Thank you for following up. Please see [JM] below.


On 29/06/2019 02:51, Benjamin Kaduk wrote:
> Hi Julien,
>
> On Fri, Jun 28, 2019 at 03:26:33PM +0200, julien.meuric@orange.com wrote:
>> Hi Ben,
>>
>> Apologies for the late response.
> I probably wouldn't have been able to reply much before now anyway -- I've
> been quite busy (and have some other documents' authors waiting for
> feedback as well).
>
>> Let us focus on your first DISCUSS comment which is the main one. You
>> raised a legitimate point that we acknowledge. After discussion, we
>> propose to modify the end of section 2.4 as follows:
>>
>> OLD
>>
>>    The semantic of the LOAD-BALANCING object is not changed.  If a PCC
>>    requests the computation of a set of TE-LSPs so that the total of
>>    their generalized bandwidth is X, the maximum number of TE-LSPs is N,
>>    and each TE-LSP must at least have a bandwidth of B, it inserts a
>>    BANDWIDTH object specifying X as the required bandwidth and a LOAD-
>>    BALANCING object with the Max-LSP and Min Bandwidth Spec fields set
>>    to N and B, respectively.
>>
>> NEW
>>
>> Â Â  The semantic of the LOAD-BALANCING object is not changed.Â  When the
>> Â Â  bandwidth can be expressed as scalars (e.g., for circuit-switched
>> Â Â  technologies), if a PCC requests the computation of a set of TE-LSPs
>> Â Â  so that the total of their generalized bandwidth is X, the maximum
>> Â Â  number of TE-LSPs is N, and each TE-LSP must at least have a
>> Â Â  bandwidth of B, it inserts a BANDWIDTH object specifying X as the
>> Â Â  required bandwidth and a LOAD-BALANCING object with the Max-LSP and
>> Â Â  Min Bandwidth Spec fields set to N and B, respectively.
>>
>> Â Â  For technologies based on statistical multiplexing (e.g., InterServ,
>> Â Â  Ethernet), the exact bandwidth management (e.g., Ethernet's Excessive
>> Â Â  Rate) is left to the PCE's policies, according to the operator's
>> Â Â  configuration. If required, further documents may introduce a new
>> Â Â  mechanism to finely express complex load balancing policies within
>> Â Â  PCEP.
>>
>>
>> Would that update address that part of your DISCUSS? (The remaining
>> parts will be straightforward once this one is resolved.)
> I seem to have forgotten some of the details of what fields are in the
> various objects, but let's see what I can say regardless of that.
> I think the general approach of specifying behavior when there's an obvious
> scalar bandwidth and leaving the choice to the PCE in other cases is a good
> approach.
>
> For the specifics, we probably don't want to say "when the bandwidth can be
> expressed as a scalar" and "for technologies based on statistical
> multiplexing" just in case there ends up being some third category, so the
> second paragraph could start off as something like "In all other cases,
> including for technologies based on statistical multiplexing [...]".
[JM] You're right. That's a safer wording, easy to include.

> It also seems like for the first case, we would be able to use the
> un-modified RFC 5440 BANDWIDTH and not need the generalized form?  But
> perhaps I misremember/misunderstand...
[JM] This is indeed what the current wording suggests, so I propose to
change "expressed by scalars" with "summarized into scalars". The idea
here is to accommodate existing constructs from RSVP-TE signaling, which
are compound objects allowing to specify more detailed information than
aggregated values. E.g., a single 10 Gb/s circuit vs. a group of 4 x 2.5
Gb/s containers.
That would lead us to the following text:

Â Â  The semantic of the LOAD-BALANCING object is not changed.Â  When the
Â Â  bandwidth can be summarized into scalars (e.g., for circuit-switched
Â Â  technologies), if a PCC requests the computation of a set of TE-LSPs
Â Â  so that the total of their generalized bandwidth is X, the maximum
Â Â  number of TE-LSPs is N, and each TE-LSP must at least have a
Â Â  bandwidth of B, it inserts a BANDWIDTH object specifying X as the
Â Â  required bandwidth and a LOAD-BALANCING object with the Max-LSP and
Â Â  Min Bandwidth Spec fields set to N and B, respectively.

Â Â  In all other cases, including for technologies based on statistical
Â Â  multiplexing (e.g., InterServ, Ethernet), the exact bandwidth
Â Â  management (e.g., Ethernet's Excessive Rate) is left to the PCE's
Â Â  policies, according to the operator's configuration. If required,
Â Â  further documents may introduce a new mechanism to finely express
Â Â  complex load balancing policies within PCEP.

Is it better?

Thank you,

Julien

> Thanks,
>
> Ben
>
>>
>> On 11/04/2019 20:48, Benjamin Kaduk wrote:
>>> On Thu, Apr 11, 2019 at 01:23:37PM +0100, Adrian Farrel wrote:
>>>> As a general response, Ben, I would say that PCEP is only catching up with GMPLS in this document. Thus, everything it is doing wrt bandwidth has been built for some while in GMPLS RSVP-TE implementations.
>>>>
>>>> It is probable that more careful references to the GMPLS signalling RFCs would address some of your points. Specifically RFC 3473 and RFC 7025. But I think section 2.3 already does this, so I'm not quite sure where to make this clarification.
>>> (I only see it referencing 7025 but not 3473.)
>>>
>>> And it looks like only the LOAD-BALANCING object, that tries to enforce
>>> that the component TE-LSPs each contribute some minmium bandwidth, is
>>> going to require much thinking.  Any other text changes on this point ought
>>> to be fairly mechanical.
>>>
>>>> FWIW, I have never heard of anyone applying Intserv approaches to GMPLS. Reservations are not statistical, and in most cases the resources are physical quantities and assigned directly.
>>> My main complaint here is that we're going from a scalar bandwidth number,
>>> that can use regular arithmetic comparisons (trichotomy) and have a clear
>>> sense of whether a minimum threshold value is achieved, to a more
>>> complicated structure (a mathematician might think of it as a vector
>>> space), where we no longer have a single clear metric or trichotomy
>>> comparison between different vectors in the space.  If we said that, even
>>> though the generalized bandwidth structure is this larger "vector" thing,
>>> the load-balancing object was going to still just use a single scalar for
>>> minimum bandwidth (and we defined how to compute the scalar bandwidth from
>>> a given generalized bandwidth structure/vector), this issue would
>>> evaporate.  The problem arises when we take the same generalized bandwidth
>>> structure and try to use it (the structure/vector) as the minimum threshold
>>> value.  Do I compare the components piece by piece and require each
>>> individual component to surpass the stated minimum?  That is well-defined
>>> in a procedural sense but may not make practical sense for all the
>>> generalized bandwidth structures defined now or in the future.
>>>
>>> -Ben
>>>
>>>> Cheers,
>>>> Adrian
>>>>
>>>> --------------
>>>>
>>>> This document makes some well-needed extensions to existing PCEP
>>>> concepts such as bandwidth, but I'm not convinced that the way they
>>>> interact with existing PCEP functionality is sufficiently well specified
>>>> to admit interoperable implementation.  Specifically, we introduce the
>>>> generalized bandwidth structures and reuse that encoding for the
>>>> generalized load balancing structures, which includes a notion of
>>>> "minimum bandwidth specification".  But now that the bandwidth
>>>> specification is a compound data structure instead of a scalar type,
>>>> it's not guaranteed that we have a strict linear ordering with
>>>> well-defined minimum.  If we consider the specific case of Intserv, do I
>>>> insist upon all three of the minimum bucket rate, minimum bucket size,
>>>> and minimum peak data rate?  Or perhaps I only care about the peak data
>>>> rate and not the bucket size/rate.  We need more text in order to
>>>> specify what "minimum" actually means/measures.
>>>>
>>>> Similarly, I'm not sure all the referenced generalized bandwidth
>>>> types/traffic parameters in Section 2.3 clearly indicate which
>>>> structures/fields we are to incorporate by reference (see COMMENT).
>>>>
>>>> Section 2.1.2 says:
>>>>
>>>>    GMPLS-CAPABILITY TLV it is RECOMMENDED that the PCC does not make use
>>>>    of the objects and TLVs defined in this document.
>>>>
>>>> Why is this not "the PCC MUST NOT make use of the objects and TLVs
>>>> defined in this document"?  Ignoring the peer's (non-)advertisement and
>>>> plowing ahead seems like a recipe for non-interoperability.
>>>>
>>>> Section 2.5.1 notes that:
>>>>
>>>>      <p2mp-endpoints> ::=
>>>>        <endpoint> [<endpoint-restriction-list>]
>>>>        [<endpoint> [<endpoint-restriction-list>]]...
>>>>
>>>>
>>>>    For endpoint type Point-to-Multipoint, several endpoint objects MAY
>>>>    be present in the message and each represents a leave, exact meaning
>>>>    depend on the endpoint type defined of the object.
>>>>
>>>> If all <endpoint>s represent leaves, then how is the head node
>>>> specified?
>>>>
>>>> I couldn't find a full spcification for some of the fields in the XRO
>>>> Label subobject (Section 2.7) by chasing the indicated references (see
>>>> COMMENT).
>>>>
>>>>
>>>> ----------------------------------------------------------------------
>>>> COMMENT:
>>>> ----------------------------------------------------------------------
>>>>
>>>> Section 1
>>>>
>>>> Please expand OTN and WSON on first use.
>>>>
>>>> Section 1.4
>>>>
>>>> It's very unclear to me what kind of support, from/by what entities/data
>>>> structures, under what conditions, these tables are attempting to
>>>> indicate.
>>>>
>>>> We should probably be consistent whether we talk about just "FOO" or
>>>> "FOO object" as the hanging text for these bulleted lists.
>>>>
>>>>    From [RFC8282]:
>>>>
>>>>    o  SWITCH-LAYER: address requirements (1, 2 and 3) for the TE-LSP and
>>>>       indicates which layer(s) should be considered, can be used to
>>>>       represent the RSVP-TE generalized label request.  [...]
>>>>
>>>> nit: this looks like a comma splice.
>>>>
>>>>    The PCEP extensions defined later in this document to cover the gap
>>>>    are:
>>>>
>>>>       Two new object types are introduced for the BANDWIDTH object
>>>>       (Generalized bandwidth, Generalized bandwidth of existing TE-LSP
>>>>       for which a reoptimization is requested).
>>>>
>>>> I'm confused by this language "new object types are introduced for the
>>>> BANDWIDTH object".  My understanding was that objects did not nest: that
>>>> is, objects have a given structure and can sometimes contain TLVs, but
>>>> do not contain other objects.  So, my current understanding is that new
>>>> objects are introduced that can appear where the BANDWIDTH object would
>>>> previously have appeared, but they are separate object (type)s from the
>>>> RFC 5440 BANDWIDTH objects.  (This language is used in the next couple
>>>> items as well.)  To be clear, this is at most an editorial
>>>> consideration, essentially whether to use "introduced for" or something
>>>> like "introduced akin to".
>>>>
>>>> Section 2.1.2
>>>>
>>>>                                                   If the PCE does not
>>>>    include the GMPLS-CAPABILITY TLV in the OPEN message and the PCC does
>>>>    include the TLV, it is RECOMMENDED that the PCC indicates a mismatch
>>>>    of capabilities.  Moreover, in case that the PCC does not receive the
>>>>
>>>> Indicate how, to whom?
>>>>
>>>> Section 2.2
>>>>
>>>> This granularity applies to all links in the path, right?  So I can't
>>>> request label-level granularity for one hop and indicate that I only
>>>> care about node-level granularity for the other hops?
>>>>
>>>> Section 2.3
>>>>
>>>> [similar comments apply here to what I mentioned at the end of Section
>>>> 1.4]
>>>>
>>>>    The Bw Spec Type correspond to the RSVP-TE SENDER_TSPEC (Object Class
>>>>    12) C-Types
>>>>
>>>> Should we ask IANA to update the SENDER_TSPEC registry to note that it
>>>> is used for PCEP as well as RSVP?
>>>>
>>>>    The encoding of the fields Generalized Bandwidth and Reverse
>>>>    Generalized Bandwidth is the same as the Traffic Parameters carried
>>>>    in RSVP-TE, it can be found in the following references.
>>>>
>>>>                       Object Type Name      Reference
>>>>
>>>>                       2           Intserv   [RFC2210]
>>>>                       4           SONET/SDH [RFC4606]
>>>>                       5           G.709     [RFC4328]
>>>>                       6           Ethernet  [RFC6003]
>>>>                       7           OTN-TDM   [RFC7139]
>>>>                       8           SSON      [RFC7792]
>>>>
>>>> It's quite confusing to have the table heading be just "object type"
>>>> when this is the value in the field named "Bw Spec Type" and corresponds
>>>> to class type values in the SENDER_TSPEC registry.
>>>>
>>>> Also, I looked up the Intserv case, and RFC 2210 doesn't really give me
>>>> a clear picture of what I'm supposed to encode as the "transport
>>>> parameters".  I think it's supposed to be the 12-octet assembly
>>>> consisting of the token bucket rate, token bucket size, and peak data
>>>> rate, but I have very low confidence in that assessment.  On the other
>>>> hand, RFC 4606 has a very nice data structure layout in Section 2.1,
>>>> "SONET/SDH Traffic Parameters".  On the gripping hand, there's not a
>>>> clear "bandwidth" number in that structure that I can apply a comparison
>>>> to for load-balancing purposes.  It doesn't look like I'll have time to
>>>> check the other four cases right now, but that will need to be done
>>>> before final publication.
>>>>
>>>> Section 2.4
>>>>
>>>> I'm having trouble parsing:
>>>>
>>>>    The LOAD-BALANCING object [RFC5440] is used to request a set of
>>>>    maximum Max-LSP TE-LSP having in total the bandwidth specified in
>>>>    BANDWIDTH, each TE-LSP having a minimum of bandwidth.
>>>>
>>>> Is it intended to read:
>>>>
>>>>    The LOAD-BALANCING object [RFC5440] is used to request allocation of a set of
>>>>    at most Max-LSP TE-LSPs, having in total the bandwidth specified in
>>>>    BANDWIDTH, with each TE-LSP having at least a specified minimum bandwidth.
>>>>
>>>> ?
>>>>
>>>> [similar comments apply here to what I mentioned at the end of Section
>>>> 1.4]
>>>>
>>>>    Bandwidth Spec Length (16 bits): the total length of the Min
>>>>    Bandwidth Spec field.  It is to be noted that the RSVP-TE traffic
>>>>    specification MAY also include TLV different from the PCEP TLVs.  The
>>>>    length MUST be strictly greater than 0.
>>>>
>>>> It's not entirely clear to me why the note about different TLVs in
>>>> RSVP-TE and PCEP belongs here.
>>>>
>>>> Section 2.5.1
>>>>
>>>>               Endpoints label restriction may not be part of the RRO or
>>>>    IRO, they can be included when following [RFC4003] in signaling for
>>>>    egress endpoint, but ingress endpoint properties can be local to the
>>>>    PCC and not signaled.  [...]
>>>>
>>>> nit: the first comma looks like a comma splice.
>>>>
>>>>                       A PCE not supporting a given Endpoint Type SHOULD
>>>>    respond with a PCErr with Error Type 4, Value TBD "Unsupported
>>>>    endpoint type in END-POINTS Generalized Endpoint object type".  [...]
>>>>
>>>> s/TBD/TBA-15/
>>>>
>>>>                                              The TLVs present in the
>>>>    request object body MUST follow the following [RFC5511] grammar:
>>>>
>>>> It feels a bit like a type error to use RBNF to describe the layout
>>>> of TLVs within a TLV block, as RBNF acts on objects.
>>>>
>>>> Section 2.5.2.4
>>>>
>>>>    The LABEL-REQUEST TLV indicates the switching capability and encoding
>>>>    type of the following label restriction list for the endpoint.  Its
>>>>    format and encoding is the same as described in [RFC3471] Section 3.1
>>>>    Generalized label request.  [...]
>>>>
>>>> Presumably the "Its" refers to just the value portion of the TLV?
>>>> That should probably be stated explicitly.
>>>>
>>>> Section 2.5.2.5
>>>>
>>>> Is there any reason for the section title to not be "LABEL-SET TLV" for
>>>> consistency with the other sections?
>>>>
>>>>    A LABEL-SET TLV represents a set of possible labels that can be used
>>>>    on an interface.  If the L bit is cleared, the label allocated on the
>>>>    first endpoint MUST be within the label set range.  [...]
>>>>
>>>> Is this MUST binding on the PCC that generates a request, or on the
>>>> computed LSP returned by the PCE?
>>>>
>>>>    A LABEL-SET TLV with the O and L bit set MUST trigger a PCErr message
>>>>    with error type="Reception of an invalid object" error value="Wrong
>>>>    LABEL-SET TLV present with O and L bit set".
>>>>
>>>>    A LABEL-SET TLV with the O bit set and an Action Field not set to 0
>>>>    (Inclusive list) or containing more than one subchannel MUST trigger
>>>>    a PCErr message with error type="Reception of an invalid object"
>>>>    error value="Wrong LABEL-SET TLV present with O bit and wrong
>>>>    format".
>>>>
>>>>    If a LABEL-SET TLV is present with O bit set, the R bit of the RP
>>>>    object MUST be set, otherwise a PCErr message MUST be sent with error
>>>>    type="Reception of an invalid object" error value="LABEL-SET TLV
>>>>    present with O bit set but without R bit set in RP".
>>>>
>>>> nit: I don't know if it makes more sense to use the TBA-25, TBA-26, and
>>>> TBA-24 values in these descriptions.
>>>>
>>>> Section 2.6
>>>>
>>>>    The IRO as defined in [RFC5440] is used to include specific objects
>>>>    in the path.  RSVP-TE allows to include label definition, in order to
>>>>    fulfill requirement 13 of [RFC7025] the IRO needs to support the new
>>>>    subobject type as defined in [RFC3473]:
>>>>
>>>> nit: this looks like a comma splice.  (A similar construction appears in
>>>> Section 2.7 as well.)
>>>>
>>>> Section 2.7
>>>>
>>>>       U (1 bit): see [RFC3471].
>>>>
>>>>       C-Type (8 bits): the C-Type of the included Label Object as
>>>>       defined in [RFC3471].
>>>>
>>>>       Label: see [RFC3471].
>>>>
>>>> Sorry, where exactly in RFC 3471?  I do not see discussion of a U bit
>>>> or C-Type therein.  (Perhaps RFC 3473 was intended?  Though, RFC 3473
>>>> seems to refer back to 3471 for the U parameter, again without section
>>>> reference.)
>>>>
>>>> Section 6
>>>>
>>>> It seems that a malicious PCC might be able to effect a denial of
>>>> service attack on the PCE by attempting to make many requests that
>>>> consume lots of resources (whether on the PCE itself or in the managed
>>>> network elements).
>>>>
>>>>                  In addition Technology specific data plane mechanism
>>>>    can be used (following [RFC5920] Section 5.8) to verify the data
>>>>    plane connectivity and deviation from constraints.
>>>>
>>>> nit: "In addition, technology-specific"
>>>>
>>>> Appendix A
>>>>
>>>> It's not entirely clear to me why this specific group of examples was
>>>> chosen and no others.  (The appendix does not seem to be referenced from
>>>> elsewhere in the document, so it appears fairly random to a reader
>>>> making it that far.)
>>>>
>>>>
>>
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Subject: [Pce] I-D Action: draft-ietf-pce-pcep-yang-12.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Path Computation Element WG of the IETF.

        Title           : A YANG Data Model for Path Computation Element Communications Protocol (PCEP)
        Authors         : Dhruv Dhody
                          Jonathan Hardwick
                          Vishnu Pavan Beeram
                          Jeff Tantsura
	Filename        : draft-ietf-pce-pcep-yang-12.txt
	Pages           : 113
	Date            : 2019-07-01

Abstract:
   This document defines a YANG data model for the management of Path
   Computation Element communications Protocol (PCEP) for communications
   between a Path Computation Client (PCC) and a Path Computation
   Element (PCE), or between two PCEs.  The data model includes
   configuration and state data.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-pce-pcep-yang/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-pce-pcep-yang-12
https://datatracker.ietf.org/doc/html/draft-ietf-pce-pcep-yang-12

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-pcep-yang-12


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Mon Jul  1 06:15:19 2019
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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Mon, 1 Jul 2019 18:44:32 +0530
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Subject: Re: [Pce] I-D Action: draft-ietf-pce-pcep-yang-12.txt
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Hi WG,

This update includes -

* Pending issues as pointed out by Tom Petch
     - Use the right prefix for imported modules
     - Removed [] around the reference I-Ds in YANG modules
     - Updated IANA
* Added lsp-id as an additional key for LSP-DB
     - Useful in case of MBB
* Added implementation section
     - If you are aware of an implementation of this YANG module, please
       reach out.


Diff: https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-pcep-yang-12

Thanks!
Dhruv (on behalf of co-authors)

On Mon, Jul 1, 2019 at 4:54 PM <internet-drafts@ietf.org> wrote:
>
>
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Path Computation Element WG of the IETF.
>
>         Title           : A YANG Data Model for Path Computation Element Communications Protocol (PCEP)
>         Authors         : Dhruv Dhody
>                           Jonathan Hardwick
>                           Vishnu Pavan Beeram
>                           Jeff Tantsura
>         Filename        : draft-ietf-pce-pcep-yang-12.txt
>         Pages           : 113
>         Date            : 2019-07-01
>
> Abstract:
>    This document defines a YANG data model for the management of Path
>    Computation Element communications Protocol (PCEP) for communications
>    between a Path Computation Client (PCC) and a Path Computation
>    Element (PCE), or between two PCEs.  The data model includes
>    configuration and state data.
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-pce-pcep-yang/
>
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-pce-pcep-yang-12
> https://datatracker.ietf.org/doc/html/draft-ietf-pce-pcep-yang-12
>
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-pcep-yang-12
>
>
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
> _______________________________________________
> Pce mailing list
> Pce@ietf.org
> https://www.ietf.org/mailman/listinfo/pce


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CC: The IESG <iesg@ietf.org>, "draft-ietf-pce-gmpls-pcep-extensions@ietf.org" <draft-ietf-pce-gmpls-pcep-extensions@ietf.org>, "pce@ietf.org" <pce@ietf.org>, "pce-chairs@ietf.org" <pce-chairs@ietf.org>
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Subject: Re: [Pce] Suresh Krishnan's No Objection on draft-ietf-pce-gmpls-pcep-extensions-14: (with COMMENT)
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On Jul 1, 2019, at 4:58 PM, Cyril Margaria <cyril.margaria@gmail.com<mailto=
:cyril.margaria@gmail.com>> wrote:

Thanks for the review,

please see inline

Best regards,
Cyril Margaria


On Tue, 9 Apr 2019 at 20:41, Suresh Krishnan via Datatracker <noreply@ietf.=
org<mailto:noreply@ietf.org>> wrote:
Suresh Krishnan has entered the following ballot position for
draft-ietf-pce-gmpls-pcep-extensions-14: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

* Section 2.5.2

"In this object type the order of the TLVs MUST be followed according to th=
e
object type definition."

Not sure what this means. Can you clarify?


[MC] This refers to Section 2.5.1 Generalized Endpoint Object Type,
the TLV ordering matters (for a given object type).
A better wording could be as follows:
NEW:
All endpoint TLVs have the standard PCEP TLV header as defined in
   [RFC5440] section 7.1.  For the Generalized Endpoint Object Type the
   TLVs MUST follow the ordering defined in Section 2.5.1.

Works for me.


* Section 2.7

"C-Type (8 bits): the C-Type of the included Label Object as defined in
[RFC3471]."

I could not find any references to C-Types in RFC3471. Shouldn't you be
referring to RFC3473 instead? I have a similar comment for the Label field.


[MC] The reference should indeed be RFC3473 for the C-Type.

Excellent. Thanks for the changes.

Regards
Suresh

--_000_100DD5E82338408195567E6C60E0EB7Bkaloomcom_
Content-Type: text/html; charset="us-ascii"
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; line-break:=
 after-white-space;" class=3D"">
<br class=3D"">
<div><br class=3D"">
<blockquote type=3D"cite" class=3D"">
<div class=3D"">On Jul 1, 2019, at 4:58 PM, Cyril Margaria &lt;<a href=3D"m=
ailto:cyril.margaria@gmail.com" class=3D"">cyril.margaria@gmail.com</a>&gt;=
 wrote:</div>
<br class=3D"Apple-interchange-newline">
<div class=3D"">
<div dir=3D"ltr" style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica=
; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weig=
ht: normal; letter-spacing: normal; text-align: start; text-indent: 0px; te=
xt-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-st=
roke-width: 0px; text-decoration: none;" class=3D"">
<div dir=3D"ltr" class=3D"">Thanks for the review,&nbsp;
<div class=3D""><br class=3D"">
</div>
<div class=3D"">please see inline</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Best regards,&nbsp;</div>
<div class=3D"">Cyril Margaria<br class=3D"">
<br class=3D"">
</div>
</div>
<br class=3D"">
<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Tue, 9 Apr 2019 at 20:41, Suresh K=
rishnan via Datatracker &lt;<a href=3D"mailto:noreply@ietf.org" class=3D"">=
noreply@ietf.org</a>&gt; wrote:<br class=3D"">
</div>
<blockquote class=3D"gmail_quote" style=3D"margin: 0px 0px 0px 0.8ex; borde=
r-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 20=
4, 204); padding-left: 1ex;">
Suresh Krishnan has entered the following ballot position for<br class=3D""=
>
draft-ietf-pce-gmpls-pcep-extensions-14: No Objection<br class=3D"">
<br class=3D"">
When responding, please keep the subject line intact and reply to all<br cl=
ass=3D"">
email addresses included in the To and CC lines. (Feel free to cut this<br =
class=3D"">
introductory paragraph, however.)<br class=3D"">
<br class=3D"">
<br class=3D"">
Please refer to<span class=3D"Apple-converted-space">&nbsp;</span><a href=
=3D"https://www.ietf.org/iesg/statement/discuss-criteria.html" rel=3D"noref=
errer" target=3D"_blank" class=3D"">https://www.ietf.org/iesg/statement/dis=
cuss-criteria.html</a><br class=3D"">
for more information about IESG DISCUSS and COMMENT positions.<br class=3D"=
">
<br class=3D"">
<br class=3D"">
The document, along with other ballot positions, can be found here:<br clas=
s=3D"">
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-pce-gmpls-pcep-exten=
sions/" rel=3D"noreferrer" target=3D"_blank" class=3D"">https://datatracker=
.ietf.org/doc/draft-ietf-pce-gmpls-pcep-extensions/</a><br class=3D"">
<br class=3D"">
<br class=3D"">
<br class=3D"">
----------------------------------------------------------------------<br c=
lass=3D"">
COMMENT:<br class=3D"">
----------------------------------------------------------------------<br c=
lass=3D"">
<br class=3D"">
* Section 2.5.2<br class=3D"">
<br class=3D"">
&quot;In this object type the order of the TLVs MUST be followed according =
to the<br class=3D"">
object type definition.&quot;<br class=3D"">
<br class=3D"">
Not sure what this means. Can you clarify?<br class=3D"">
<br class=3D"">
</blockquote>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">[MC] This refers to Section 2.5.1 Generalized Endpoint Obje=
ct Type,<br class=3D"">
the TLV ordering matters (for a given object type).<br class=3D"">
A better wording could be as follows:<br class=3D"">
NEW:<br class=3D"">
All endpoint TLVs have the standard PCEP TLV header as defined in<br class=
=3D"">
&nbsp; &nbsp;[RFC5440] section 7.1.&nbsp; For the Generalized Endpoint Obje=
ct Type the<br class=3D"">
&nbsp; &nbsp;TLVs MUST follow the ordering defined in Section 2.5.1.<br cla=
ss=3D"">
</div>
</div>
</div>
</div>
</blockquote>
<div><br class=3D"">
</div>
Works for me.</div>
<div><br class=3D"">
<blockquote type=3D"cite" class=3D"">
<div class=3D"">
<div dir=3D"ltr" style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica=
; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weig=
ht: normal; letter-spacing: normal; text-align: start; text-indent: 0px; te=
xt-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-st=
roke-width: 0px; text-decoration: none;" class=3D"">
<div class=3D"gmail_quote">
<div class=3D"">&nbsp;</div>
<blockquote class=3D"gmail_quote" style=3D"margin: 0px 0px 0px 0.8ex; borde=
r-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 20=
4, 204); padding-left: 1ex;">
* Section 2.7<br class=3D"">
<br class=3D"">
&quot;C-Type (8 bits): the C-Type of the included Label Object as defined i=
n<br class=3D"">
[RFC3471].&quot;<br class=3D"">
<br class=3D"">
I could not find any references to C-Types in RFC3471. Shouldn't you be<br =
class=3D"">
referring to RFC3473 instead? I have a similar comment for the Label field.=
<br class=3D"">
<br class=3D"">
</blockquote>
<div class=3D""><br class=3D"">
[MC] The reference should indeed be RFC3473 for the C-Type.</div>
</div>
</div>
</div>
</blockquote>
</div>
<div><br class=3D"">
</div>
<div>Excellent. Thanks for the changes.</div>
<div><br class=3D"">
</div>
<div>Regards</div>
<div>Suresh</div>
</body>
</html>

--_000_100DD5E82338408195567E6C60E0EB7Bkaloomcom_--


From nobody Tue Jul  2 09:52:17 2019
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Date: Tue, 2 Jul 2019 11:51:52 -0500
From: Benjamin Kaduk <kaduk@mit.edu>
To: julien.meuric@orange.com
Cc: Adrian Farrel <adrian@olddog.co.uk>, "'The IESG'" <iesg@ietf.org>, draft-ietf-pce-gmpls-pcep-extensions@ietf.org, pce-chairs@ietf.org, pce@ietf.org
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References: <155498315544.12722.1073746104492266680.idtracker@ietfa.amsl.com> <046301d4f061$646ee470$2d4cad50$@olddog.co.uk> <20190411184842.GN18549@kduck.mit.edu> <13331_1561728394_5D16158A_13331_219_1_5b5e922c-95a9-7a13-4c15-507ede8927e4@orange.com> <20190629005125.GG10013@kduck.mit.edu> <13959_1561974305_5D19D621_13959_289_1_c3d7e7d8-ebcd-eb2f-d0cb-1028fed19d20@orange.com>
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Subject: Re: [Pce] Benjamin Kaduk's Discuss on draft-ietf-pce-gmpls-pcep-extensions-14: (with DISCUSS and COMMENT)
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On Mon, Jul 01, 2019 at 11:45:04AM +0200, julien.meuric@orange.com wrote:
> Hi Ben,
> 
> Thank you for following up. Please see [JM] below.
> 
> 
> On 29/06/2019 02:51, Benjamin Kaduk wrote:
> > Hi Julien,
> >
> > On Fri, Jun 28, 2019 at 03:26:33PM +0200, julien.meuric@orange.com wrote:
> >> Hi Ben,
> >>
> >> Apologies for the late response.
> > I probably wouldn't have been able to reply much before now anyway -- I've
> > been quite busy (and have some other documents' authors waiting for
> > feedback as well).
> >
> >> Let us focus on your first DISCUSS comment which is the main one. You
> >> raised a legitimate point that we acknowledge. After discussion, we
> >> propose to modify the end of section 2.4 as follows:
> >>
> >> OLD
> >>
> >>    The semantic of the LOAD-BALANCING object is not changed.  If a PCC
> >>    requests the computation of a set of TE-LSPs so that the total of
> >>    their generalized bandwidth is X, the maximum number of TE-LSPs is N,
> >>    and each TE-LSP must at least have a bandwidth of B, it inserts a
> >>    BANDWIDTH object specifying X as the required bandwidth and a LOAD-
> >>    BALANCING object with the Max-LSP and Min Bandwidth Spec fields set
> >>    to N and B, respectively.
> >>
> >> NEW
> >>
> >>    The semantic of the LOAD-BALANCING object is not changed.  When the
> >>    bandwidth can be expressed as scalars (e.g., for circuit-switched
> >>    technologies), if a PCC requests the computation of a set of TE-LSPs
> >>    so that the total of their generalized bandwidth is X, the maximum
> >>    number of TE-LSPs is N, and each TE-LSP must at least have a
> >>    bandwidth of B, it inserts a BANDWIDTH object specifying X as the
> >>    required bandwidth and a LOAD-BALANCING object with the Max-LSP and
> >>    Min Bandwidth Spec fields set to N and B, respectively.
> >>
> >>    For technologies based on statistical multiplexing (e.g., InterServ,
> >>    Ethernet), the exact bandwidth management (e.g., Ethernet's Excessive
> >>    Rate) is left to the PCE's policies, according to the operator's
> >>    configuration. If required, further documents may introduce a new
> >>    mechanism to finely express complex load balancing policies within
> >>    PCEP.
> >>
> >>
> >> Would that update address that part of your DISCUSS? (The remaining
> >> parts will be straightforward once this one is resolved.)
> > I seem to have forgotten some of the details of what fields are in the
> > various objects, but let's see what I can say regardless of that.
> > I think the general approach of specifying behavior when there's an obvious
> > scalar bandwidth and leaving the choice to the PCE in other cases is a good
> > approach.
> >
> > For the specifics, we probably don't want to say "when the bandwidth can be
> > expressed as a scalar" and "for technologies based on statistical
> > multiplexing" just in case there ends up being some third category, so the
> > second paragraph could start off as something like "In all other cases,
> > including for technologies based on statistical multiplexing [...]".
> [JM] You're right. That's a safer wording, easy to include.
> 
> > It also seems like for the first case, we would be able to use the
> > un-modified RFC 5440 BANDWIDTH and not need the generalized form?  But
> > perhaps I misremember/misunderstand...
> [JM] This is indeed what the current wording suggests, so I propose to
> change "expressed by scalars" with "summarized into scalars". The idea
> here is to accommodate existing constructs from RSVP-TE signaling, which
> are compound objects allowing to specify more detailed information than
> aggregated values. E.g., a single 10 Gb/s circuit vs. a group of 4 x 2.5
> Gb/s containers.
> That would lead us to the following text:
> 
>    The semantic of the LOAD-BALANCING object is not changed.  When the
>    bandwidth can be summarized into scalars (e.g., for circuit-switched
>    technologies), if a PCC requests the computation of a set of TE-LSPs
>    so that the total of their generalized bandwidth is X, the maximum
>    number of TE-LSPs is N, and each TE-LSP must at least have a
>    bandwidth of B, it inserts a BANDWIDTH object specifying X as the
>    required bandwidth and a LOAD-BALANCING object with the Max-LSP and
>    Min Bandwidth Spec fields set to N and B, respectively.
> 
>    In all other cases, including for technologies based on statistical
>    multiplexing (e.g., InterServ, Ethernet), the exact bandwidth
>    management (e.g., Ethernet's Excessive Rate) is left to the PCE's
>    policies, according to the operator's configuration. If required,
>    further documents may introduce a new mechanism to finely express
>    complex load balancing policies within PCEP.
> 
> Is it better?

That is better; thank you.

The only other comment I have would be to ask if it's worth saying
something in the first paragraph about how "other link-technology-specific
parameters are not included in the bandwidth calculation" (with my
apologies for probably using the wrong terminology; this is not my area of
expertise).

-Ben


From nobody Wed Jul  3 03:29:30 2019
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To: Benjamin Kaduk <kaduk@mit.edu>
CC: Adrian Farrel <adrian@olddog.co.uk>, 'The IESG' <iesg@ietf.org>, <draft-ietf-pce-gmpls-pcep-extensions@ietf.org>, <pce-chairs@ietf.org>, <pce@ietf.org>
References: <155498315544.12722.1073746104492266680.idtracker@ietfa.amsl.com> <046301d4f061$646ee470$2d4cad50$@olddog.co.uk> <20190411184842.GN18549@kduck.mit.edu> <13331_1561728394_5D16158A_13331_219_1_5b5e922c-95a9-7a13-4c15-507ede8927e4@orange.com> <20190629005125.GG10013@kduck.mit.edu> <13959_1561974305_5D19D621_13959_289_1_c3d7e7d8-ebcd-eb2f-d0cb-1028fed19d20@orange.com> <20190702165151.GV13810@kduck.mit.edu>
From: <julien.meuric@orange.com>
Organization: Orange
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Subject: Re: [Pce] Benjamin Kaduk's Discuss on draft-ietf-pce-gmpls-pcep-extensions-14: (with DISCUSS and COMMENT)
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Hi Ben,

Would this address your previous comment? (Please see the text in brackets.)

Â Â  The semantic of the LOAD-BALANCING object is not changed.Â  When the
Â Â  bandwidth can be summarized into scalars (e.g., for circuit-switched
Â Â  technologies, Traffic Parameters express detailed container
Â Â  requirements implicitly mapping to a well-defined bandwidth), if a
Â Â  PCC requests the computation of a set of TE-LSPs so that the total of
Â Â  their generalized bandwidth is X, the maximum number of TE-LSPs is N,
Â Â  and each TE-LSP must at least have a bandwidth of B, it inserts a
Â Â  BANDWIDTH object specifying X as the required bandwidth and a
Â Â  LOAD-BALANCING object with the Max-LSP and Min Bandwidth Spec fields
Â Â  set to N and B, respectively.

Thanks,

Julien


On 02/07/2019 18:51, Benjamin Kaduk wrote:
> On Mon, Jul 01, 2019 at 11:45:04AM +0200, julien.meuric@orange.com wrote:
>> Hi Ben,
>>
>> Thank you for following up. Please see [JM] below.
>>
>>
>> On 29/06/2019 02:51, Benjamin Kaduk wrote:
>>> Hi Julien,
>>>
>>> On Fri, Jun 28, 2019 at 03:26:33PM +0200, julien.meuric@orange.com wrote:
>>>> Hi Ben,
>>>>
>>>> Apologies for the late response.
>>> I probably wouldn't have been able to reply much before now anyway -- I've
>>> been quite busy (and have some other documents' authors waiting for
>>> feedback as well).
>>>
>>>> Let us focus on your first DISCUSS comment which is the main one. You
>>>> raised a legitimate point that we acknowledge. After discussion, we
>>>> propose to modify the end of section 2.4 as follows:
>>>>
>>>> OLD
>>>>
>>>>    The semantic of the LOAD-BALANCING object is not changed.  If a PCC
>>>>    requests the computation of a set of TE-LSPs so that the total of
>>>>    their generalized bandwidth is X, the maximum number of TE-LSPs is N,
>>>>    and each TE-LSP must at least have a bandwidth of B, it inserts a
>>>>    BANDWIDTH object specifying X as the required bandwidth and a LOAD-
>>>>    BALANCING object with the Max-LSP and Min Bandwidth Spec fields set
>>>>    to N and B, respectively.
>>>>
>>>> NEW
>>>>
>>>> Â Â  The semantic of the LOAD-BALANCING object is not changed.Â  When the
>>>> Â Â  bandwidth can be expressed as scalars (e.g., for circuit-switched
>>>> Â Â  technologies), if a PCC requests the computation of a set of TE-LSPs
>>>> Â Â  so that the total of their generalized bandwidth is X, the maximum
>>>> Â Â  number of TE-LSPs is N, and each TE-LSP must at least have a
>>>> Â Â  bandwidth of B, it inserts a BANDWIDTH object specifying X as the
>>>> Â Â  required bandwidth and a LOAD-BALANCING object with the Max-LSP and
>>>> Â Â  Min Bandwidth Spec fields set to N and B, respectively.
>>>>
>>>> Â Â  For technologies based on statistical multiplexing (e.g., InterServ,
>>>> Â Â  Ethernet), the exact bandwidth management (e.g., Ethernet's Excessive
>>>> Â Â  Rate) is left to the PCE's policies, according to the operator's
>>>> Â Â  configuration. If required, further documents may introduce a new
>>>> Â Â  mechanism to finely express complex load balancing policies within
>>>> Â Â  PCEP.
>>>>
>>>>
>>>> Would that update address that part of your DISCUSS? (The remaining
>>>> parts will be straightforward once this one is resolved.)
>>> I seem to have forgotten some of the details of what fields are in the
>>> various objects, but let's see what I can say regardless of that.
>>> I think the general approach of specifying behavior when there's an obvious
>>> scalar bandwidth and leaving the choice to the PCE in other cases is a good
>>> approach.
>>>
>>> For the specifics, we probably don't want to say "when the bandwidth can be
>>> expressed as a scalar" and "for technologies based on statistical
>>> multiplexing" just in case there ends up being some third category, so the
>>> second paragraph could start off as something like "In all other cases,
>>> including for technologies based on statistical multiplexing [...]".
>> [JM] You're right. That's a safer wording, easy to include.
>>
>>> It also seems like for the first case, we would be able to use the
>>> un-modified RFC 5440 BANDWIDTH and not need the generalized form?  But
>>> perhaps I misremember/misunderstand...
>> [JM] This is indeed what the current wording suggests, so I propose to
>> change "expressed by scalars" with "summarized into scalars". The idea
>> here is to accommodate existing constructs from RSVP-TE signaling, which
>> are compound objects allowing to specify more detailed information than
>> aggregated values. E.g., a single 10 Gb/s circuit vs. a group of 4 x 2.5
>> Gb/s containers.
>> That would lead us to the following text:
>>
>> Â Â  The semantic of the LOAD-BALANCING object is not changed.Â  When the
>> Â Â  bandwidth can be summarized into scalars (e.g., for circuit-switched
>> Â Â  technologies), if a PCC requests the computation of a set of TE-LSPs
>> Â Â  so that the total of their generalized bandwidth is X, the maximum
>> Â Â  number of TE-LSPs is N, and each TE-LSP must at least have a
>> Â Â  bandwidth of B, it inserts a BANDWIDTH object specifying X as the
>> Â Â  required bandwidth and a LOAD-BALANCING object with the Max-LSP and
>> Â Â  Min Bandwidth Spec fields set to N and B, respectively.
>>
>> Â Â  In all other cases, including for technologies based on statistical
>> Â Â  multiplexing (e.g., InterServ, Ethernet), the exact bandwidth
>> Â Â  management (e.g., Ethernet's Excessive Rate) is left to the PCE's
>> Â Â  policies, according to the operator's configuration. If required,
>> Â Â  further documents may introduce a new mechanism to finely express
>> Â Â  complex load balancing policies within PCEP.
>>
>> Is it better?
> That is better; thank you.
>
> The only other comment I have would be to ask if it's worth saying
> something in the first paragraph about how "other link-technology-specific
> parameters are not included in the bandwidth calculation" (with my
> apologies for probably using the wrong terminology; this is not my area of
> expertise).
>
> -Ben


_________________________________________________________________________________________________________________________

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Subject: [Pce] Alvaro Retana's No Objection on draft-ietf-pce-association-group-09: (with COMMENT)
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Alvaro Retana has entered the following ballot position for
draft-ietf-pce-association-group-09: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

(1) s/before hand/beforehand/g

(2) Â§5: "Start-Assoc-ID...The values 0 and 0xffff MUST NOT be used."  What
should the receiver do if they are?

(3) Â§5: "Range...it MUST be such that (Start-Assoc-ID + Range) do not cross the
association identifier range of 0xffff."  What should the receiver do if it
does?

(4) s/is OPTIONAL and MAY/MAY/g   OPTIONAL = MAY

(5) Â§9.2: "An implementation SHOULD allow...Further implementation SHOULD
allow... To serve this purpose, the PCEP YANG module [I-D.ietf-pce-pcep-yang]
includes association groups."  If I-D.ietf-pce-pcep-yang is the mechanism that
addresses these Normative statements, then it should be a Normative reference. 
I think that it is not necessary to point at I-D.ietf-pce-pcep-yang in this
document.

(6) RFC8126 should be a Normative reference.



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Date: Wed, 3 Jul 2019 18:12:49 -0500
From: Benjamin Kaduk <kaduk@mit.edu>
To: julien.meuric@orange.com
Cc: Adrian Farrel <adrian@olddog.co.uk>, "'The IESG'" <iesg@ietf.org>, draft-ietf-pce-gmpls-pcep-extensions@ietf.org, pce-chairs@ietf.org, pce@ietf.org
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Subject: Re: [Pce] Benjamin Kaduk's Discuss on draft-ietf-pce-gmpls-pcep-extensions-14: (with DISCUSS and COMMENT)
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Hi Julien,

That's quite helpful; thanks again!

-Ben

On Wed, Jul 03, 2019 at 12:29:17PM +0200, julien.meuric@orange.com wrote:
> Hi Ben,
> 
> Would this address your previous comment? (Please see the text in brackets.)
> 
>    The semantic of the LOAD-BALANCING object is not changed.  When the
>    bandwidth can be summarized into scalars (e.g., for circuit-switched
>    technologies, Traffic Parameters express detailed container
>    requirements implicitly mapping to a well-defined bandwidth), if a
>    PCC requests the computation of a set of TE-LSPs so that the total of
>    their generalized bandwidth is X, the maximum number of TE-LSPs is N,
>    and each TE-LSP must at least have a bandwidth of B, it inserts a
>    BANDWIDTH object specifying X as the required bandwidth and a
>    LOAD-BALANCING object with the Max-LSP and Min Bandwidth Spec fields
>    set to N and B, respectively.
> 
> Thanks,
> 
> Julien
> 
> 
> On 02/07/2019 18:51, Benjamin Kaduk wrote:
> > On Mon, Jul 01, 2019 at 11:45:04AM +0200, julien.meuric@orange.com wrote:
> >> Hi Ben,
> >>
> >> Thank you for following up. Please see [JM] below.
> >>
> >>
> >> On 29/06/2019 02:51, Benjamin Kaduk wrote:
> >>> Hi Julien,
> >>>
> >>> On Fri, Jun 28, 2019 at 03:26:33PM +0200, julien.meuric@orange.com wrote:
> >>>> Hi Ben,
> >>>>
> >>>> Apologies for the late response.
> >>> I probably wouldn't have been able to reply much before now anyway -- I've
> >>> been quite busy (and have some other documents' authors waiting for
> >>> feedback as well).
> >>>
> >>>> Let us focus on your first DISCUSS comment which is the main one. You
> >>>> raised a legitimate point that we acknowledge. After discussion, we
> >>>> propose to modify the end of section 2.4 as follows:
> >>>>
> >>>> OLD
> >>>>
> >>>>    The semantic of the LOAD-BALANCING object is not changed.  If a PCC
> >>>>    requests the computation of a set of TE-LSPs so that the total of
> >>>>    their generalized bandwidth is X, the maximum number of TE-LSPs is N,
> >>>>    and each TE-LSP must at least have a bandwidth of B, it inserts a
> >>>>    BANDWIDTH object specifying X as the required bandwidth and a LOAD-
> >>>>    BALANCING object with the Max-LSP and Min Bandwidth Spec fields set
> >>>>    to N and B, respectively.
> >>>>
> >>>> NEW
> >>>>
> >>>>    The semantic of the LOAD-BALANCING object is not changed.  When the
> >>>>    bandwidth can be expressed as scalars (e.g., for circuit-switched
> >>>>    technologies), if a PCC requests the computation of a set of TE-LSPs
> >>>>    so that the total of their generalized bandwidth is X, the maximum
> >>>>    number of TE-LSPs is N, and each TE-LSP must at least have a
> >>>>    bandwidth of B, it inserts a BANDWIDTH object specifying X as the
> >>>>    required bandwidth and a LOAD-BALANCING object with the Max-LSP and
> >>>>    Min Bandwidth Spec fields set to N and B, respectively.
> >>>>
> >>>>    For technologies based on statistical multiplexing (e.g., InterServ,
> >>>>    Ethernet), the exact bandwidth management (e.g., Ethernet's Excessive
> >>>>    Rate) is left to the PCE's policies, according to the operator's
> >>>>    configuration. If required, further documents may introduce a new
> >>>>    mechanism to finely express complex load balancing policies within
> >>>>    PCEP.
> >>>>
> >>>>
> >>>> Would that update address that part of your DISCUSS? (The remaining
> >>>> parts will be straightforward once this one is resolved.)
> >>> I seem to have forgotten some of the details of what fields are in the
> >>> various objects, but let's see what I can say regardless of that.
> >>> I think the general approach of specifying behavior when there's an obvious
> >>> scalar bandwidth and leaving the choice to the PCE in other cases is a good
> >>> approach.
> >>>
> >>> For the specifics, we probably don't want to say "when the bandwidth can be
> >>> expressed as a scalar" and "for technologies based on statistical
> >>> multiplexing" just in case there ends up being some third category, so the
> >>> second paragraph could start off as something like "In all other cases,
> >>> including for technologies based on statistical multiplexing [...]".
> >> [JM] You're right. That's a safer wording, easy to include.
> >>
> >>> It also seems like for the first case, we would be able to use the
> >>> un-modified RFC 5440 BANDWIDTH and not need the generalized form?  But
> >>> perhaps I misremember/misunderstand...
> >> [JM] This is indeed what the current wording suggests, so I propose to
> >> change "expressed by scalars" with "summarized into scalars". The idea
> >> here is to accommodate existing constructs from RSVP-TE signaling, which
> >> are compound objects allowing to specify more detailed information than
> >> aggregated values. E.g., a single 10 Gb/s circuit vs. a group of 4 x 2.5
> >> Gb/s containers.
> >> That would lead us to the following text:
> >>
> >>    The semantic of the LOAD-BALANCING object is not changed.  When the
> >>    bandwidth can be summarized into scalars (e.g., for circuit-switched
> >>    technologies), if a PCC requests the computation of a set of TE-LSPs
> >>    so that the total of their generalized bandwidth is X, the maximum
> >>    number of TE-LSPs is N, and each TE-LSP must at least have a
> >>    bandwidth of B, it inserts a BANDWIDTH object specifying X as the
> >>    required bandwidth and a LOAD-BALANCING object with the Max-LSP and
> >>    Min Bandwidth Spec fields set to N and B, respectively.
> >>
> >>    In all other cases, including for technologies based on statistical
> >>    multiplexing (e.g., InterServ, Ethernet), the exact bandwidth
> >>    management (e.g., Ethernet's Excessive Rate) is left to the PCE's
> >>    policies, according to the operator's configuration. If required,
> >>    further documents may introduce a new mechanism to finely express
> >>    complex load balancing policies within PCEP.
> >>
> >> Is it better?
> > That is better; thank you.
> >
> > The only other comment I have would be to ask if it's worth saying
> > something in the first paragraph about how "other link-technology-specific
> > parameters are not included in the bandwidth calculation" (with my
> > apologies for probably using the wrong terminology; this is not my area of
> > expertise).
> >
> > -Ben
> 
> 
> _________________________________________________________________________________________________________________________
> 
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> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration,
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> 
> This message and its attachments may contain confidential or privileged information that may be protected by law;
> they should not be distributed, used or copied without authorisation.
> If you have received this email in error, please notify the sender and delete this message and its attachments.
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> Thank you.
> 


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Date: Thu, 4 Jul 2019 16:02:39 +0530
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To: Alvaro Retana <aretana.ietf@gmail.com>
Cc: The IESG <iesg@ietf.org>, draft-ietf-pce-association-group@ietf.org,  Julien Meuric <julien.meuric@orange.com>, pce-chairs <pce-chairs@ietf.org>, pce@ietf.org
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Subject: Re: [Pce] Alvaro Retana's No Objection on draft-ietf-pce-association-group-09: (with COMMENT)
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Hi Alvaro,

Please see inline...

On Thu, Jul 4, 2019 at 1:00 AM Alvaro Retana via Datatracker
<noreply@ietf.org> wrote:
>
> Alvaro Retana has entered the following ballot position for
> draft-ietf-pce-association-group-09: No Objection
>
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut this
> introductory paragraph, however.)
>
>
> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
>
>
> The document, along with other ballot positions, can be found here:
> https://datatracker.ietf.org/doc/draft-ietf-pce-association-group/
>
>
>
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>
> (1) s/before hand/beforehand/g
>

Ack.

> (2) =C2=A75: "Start-Assoc-ID...The values 0 and 0xffff MUST NOT be used."=
  What
> should the receiver do if they are?
>

Section 5.1 includes -

   If the
   Start-Assoc-ID or Range are set incorrectly, the PCEP session MUST be
   rejected with error type 1 and error value 1 (PCEP session
   establishment failure / Reception of an invalid Open message).

But I can make this clearer right here.

> (3) =C2=A75: "Range...it MUST be such that (Start-Assoc-ID + Range) do no=
t cross the
> association identifier range of 0xffff."  What should the receiver do if =
it
> does?
>

See above.

> (4) s/is OPTIONAL and MAY/MAY/g   OPTIONAL =3D MAY
>

Ack.

> (5) =C2=A79.2: "An implementation SHOULD allow...Further implementation S=
HOULD
> allow... To serve this purpose, the PCEP YANG module [I-D.ietf-pce-pcep-y=
ang]
> includes association groups."  If I-D.ietf-pce-pcep-yang is the mechanism=
 that
> addresses these Normative statements, then it should be a Normative refer=
ence.
> I think that it is not necessary to point at I-D.ietf-pce-pcep-yang in th=
is
> document.
>

I reworded this to -

   The PCEP YANG module is defined in [I-D.ietf-pce-pcep-yang]. In
   future, this YANG module should be extended or augmented to provide
   the following additional information relating to association groups.

   An implementation SHOULD allow the operator to view the associations
   configured or created dynamically.  Further implementation SHOULD
   allow to view associations reported by each peer, and the current set
   of LSPs in the association.


But retained the informational reference. Hope this is okay?

> (6) RFC8126 should be a Normative reference.
>
>

Ack.

Thanks for your review.

Working Copy - https://raw.githubusercontent.com/dhruvdhody-huawei/ietf/mas=
ter/draft-ietf-pce-association-group-10.txt
Diff - https://tools.ietf.org/rfcdiff?url1=3Ddraft-ietf-pce-association-gro=
up-09&url2=3Dhttps://raw.githubusercontent.com/dhruvdhody-huawei/ietf/maste=
r/draft-ietf-pce-association-group-10.txt

Thanks!
Dhruv


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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Path Computation Element WG of the IETF.

        Title           : Path Computation Element Communication Protocol (PCEP) Extension for LSP Diversity Constraint Signaling
        Authors         : Stephane Litkowski
                          Siva Sivabalan
                          Colby Barth
                          Mahendra Singh Negi
	Filename        : draft-ietf-pce-association-diversity-08.txt
	Pages           : 22
	Date            : 2019-07-04

Abstract:
   This document introduces a simple mechanism to associate a group of
   Label Switched Paths (LSPs) via an extension to the Path Computation
   Element (PCE) communication Protocol (PCEP) with the purpose of
   computing diverse paths for those LSPs.  The proposed extension
   allows a Path Computation Client (PCC) to advertise to a PCE that a
   particular LSP belongs to a disjoint-group, thus the PCE knows that
   the LSPs in the same group need to be disjoint from each other.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-pce-association-diversity/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-pce-association-diversity-08
https://datatracker.ietf.org/doc/html/draft-ietf-pce-association-diversity-08

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-association-diversity-08


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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From nobody Fri Jul  5 08:12:15 2019
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To: Mahendra Singh Negi <mahendrasingh@huawei.com>
CC: "draft-ietf-pce-association-diversity@ietf.org" <draft-ietf-pce-association-diversity@ietf.org>, "pce@ietf.org" <pce@ietf.org>
References: <27633_1561735409_5D1630F1_27633_206_1_6625dc22-f403-4359-685b-73c79f6bb93b@orange.com> <05ed351effca42158d3d4ab00ace3cb6@huawei.com>
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Subject: Re: [Pce] Shepherd Review of draft-ietf-pce-association-diversity-07
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Hi Mahendra,

This revision looks good. Thanks.

Julien


On 05/07/2019 06:40, Mahendra Singh Negi wrote:
> Hi Julien,
>
> Many thanks for the detailed review comments, we have fixed all the comments and new version is posted, please find the new-version and version-diff links below:
>
> Htmlized:       https://datatracker.ietf.org/doc/html/draft-ietf-pce-association-diversity
> Diff:           https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-association-diversity-08
>
> To answer your question:
> Complementary question: why an optional behavior (SHOULD) instead of mandatory (MUST)? ->   Yes MUST is appropriate and updated in the new version.
>
>
> Thanks,
> Mahendra
>
> -----Original Message-----
> From: julien.meuric@orange.com [mailto:julien.meuric@orange.com] 
> Sent: 28 June 2019 20:53
>
> Hi authors,
>
> Please find below my detailed comments on draft-ietf-pce-association-diversity. I originally started to review -06. Thanks for posting -07 after Dhruv's comments, as it addressed some on mine as well.
>
> The main technical concern lies in section 4.6, in case no solution is found by the PCE. Section 4.3, about SVEC, relies on PCRep with NO-PATH, which is consistent with existing PCEP specification. IMHO, section 4.6 is confusing and incomplete. What about the following?
>
> OLD
> Â Â  [...] the PCE SHOULD
> Â Â  reply with a PCUpd message containing an empty ERO.Â  In addition to
> Â Â  the empty ERO Object, the PCE MAY add the NO-PATH-VECTOR TLV [...]
>
> NEW
> Â Â Â  [...] the PCE MUST
> Â Â  reply to a request (PCEReq) with a PCRep message containing a NO-PATH
> Â Â  object. In case of network event leading to an impossible strict
> Â Â  disjointness, the PCE SHOULD send a PCUpd message containing an empty
> Â Â  ERO to the corresponding PCCs. In addition to the NO-PATH or the
> Â Â  empty ERO object, the PCE MAY add the NO-PATH-VECTOR TLV [...]
>
> Complementary question: why an optional behavior (SHOULD) instead of mandatory (MUST)?
>
>
> Nits:
> ------
> Global and usual nit: the flag name. The I-D has a collection of X flag/X-flag/X-Flag/flag X/etc that needs consistency. Many PCEP documents use "X flag".
> ------
> Title
> ---
> - s/communication Protocol (PCEP) extension for signaling LSP diversity constraint/Communication Protocol (PCEP) Extension for LSP Diversity Constraint Signaling/
> ------
> Abstract
> ---
> - s/Communication Protocol/communication Protocol/
> - s/knows that LSPs in the same group/knows that the LSPs in the same group/
> - s/needs to/need to/
> ------
> 2. Terminology
> ---
> - s/Communication Protocol/communication Protocol/
> ------
> 3.Â  Motivation
> ---
> - s/above, consider that/above, let us consider that/
> - s/difficult. Whereas, computation/difficult, whereas computation/
> - s/These messages uses/These messages use/
> - s/the disjoint path computation/a disjoint path computation/
> - s/disjoint group-ids/disjoint group IDs/
> - s/should allow to overcome/allows to overcome/
> - s/association source could/the association source could/
> ------
> 4. Protocol extension
> ---
> - s/Protocol extension/Protocol Extension/
> - s/Association group/Association Group/
> - s/TLVs - Global Association Source or Extended Association ID are included/TLVs - Global Association Source or Extended Association ID - are included/
> - s/to uniquely identifying/to uniquely identify/
> - s/Association object -/Association object:/
> - s/[I-D.ietf-pce-association-group]
> specify/[I-D.ietf-pce-association-group] specifies/
> - s/in the PCEP messages/in PCEP messages/
> - s/Refer [I-D.ietf-pce-association-group]/Refer to [I-D.ietf-pce-association-group]/
> - s/more LSPs. But a PCE/more LSPs, but a PCE/
> - s/in how many LSPs/in the number of LSPs/
> - s/vendor specific behavioral information/vendor-specific behavioral information/
> - OLD
> Â Â Â Â Â Â Â Â  When unset, PCE is allowed to relax disjointness
> Â Â Â Â Â Â Â Â  by using either applying a requested objective function or any
> Â Â Â Â Â Â Â Â  other behavior if no objective function is requested (e.g.:
> Â Â Â Â Â Â Â Â  using a lower disjoint type (link instead of node) or relaxing
> Â Â Â Â Â Â Â Â  disjointness constraint fully)
> Â  NEW
> Â Â Â Â Â Â Â Â  When unset, the PCE is allowed to relax disjointness
> Â Â Â Â Â Â Â Â  by either applying a requested objective function (cf. section
> Â Â Â Â Â Â Â Â  4.4 below) or using any other behavior if no objective function
> Â Â Â Â Â Â Â Â  is requested (e.g. using a lower disjoint type (link instead of
> Â Â Â Â Â Â Â Â  node) or fully relaxing disjointness constraint).
>
> - s/The flagsÂ  L, N, and S/The L, N and S flags/
> - s/The flag P/The P flag/
> - s/the flag T/the T flag/
> - s/both SVEC and ASSOCIATION object/both SVEC and ASSOCIATION objects/
> - s/in SVEC object/in the SVEC object/
> - s/with NO-PATH object/with a NO-PATH object/
> - s/Disjointness objective functions/Disjointness Objective Functions/
> - s/The PCEP OF-List TLV allow/Whereas the PCEP OF-List TLV allows/
> - s/Incompatible OF codes/Incompatible OF code/
> - s/listed below -/listed below:/
> - The last example at the end of section 4.4 shows that the specification doesn't prohibit redundant constraints. I would be nice to add a sentence explicitly stating that in the previous paragraph.
> - s/P-flag considerations/P Flag Considerations/
> - s/fulfill the customer requirement/fulfill customer's requirements/
> - s/Consider, this customer/Let us consider that this customer/
> - s/( and/(and/
> - s/allows a simple expression that/allows to simply express that/
> - s/If PE->PE2/If PE1->PE2/
> - Many P-flag/P-Flag to be fixed in section 4.5.
> - s/Disjointness computation issues/Disjointness Computation Issues/
> - s/T-bit/T flag/Â  [x2]
> ------
> 5. Security Considerations
> ---
> - s/which do not/which does not/
> - s/defines following new PCEP TLVs/defines the following new PCEP TLVs/
> - s/PCEP-ERROR codes/PCEP-ERROR Codes/
> - s/defines new Error-Type and Error-Value/defines new Error-Value within existing Error-Type/
> - s/Incompatible OF codes/Incompatible OF code/
> ------
> 8. Acknowledgements
> ---
> - s/to author of/to the authors of/
> ------
>
> Thanks,
>
> Julien
>
>
> _________________________________________________________________________________________________________________________
>
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>


_________________________________________________________________________________________________________________________

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From nobody Fri Jul  5 08:33:26 2019
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Subject: [Pce] Publication has been requested for draft-ietf-pce-association-diversity-08
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Julien Meuric has requested publication of draft-ietf-pce-association-diversity-08 as Proposed Standard on behalf of the PCE working group.

Please verify the document's state at https://datatracker.ietf.org/doc/draft-ietf-pce-association-diversity/


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From: Tal Mizrahi <tal.mizrahi.phd@gmail.com>
Date: Sun, 7 Jul 2019 10:35:29 +0300
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Subject: [Pce] RtgDir review: draft-ietf-pce-stateful-hpce
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--000000000000e6026e058d125fce
Content-Type: text/plain; charset="UTF-8"

Hello,

I have been selected as the Routing Directorate reviewer for this draft.
The Routing Directorate seeks to review all routing or routing-related
drafts as they pass through IETF last call and IESG review, and sometimes
on special request. The purpose of the review is to provide assistance to
the Routing ADs. For more information about the Routing Directorate, please
see http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir

Although these comments are primarily for the use of the Routing ADs, it
would be helpful if you could consider them along with any other IETF Last
Call comments that you receive, and strive to resolve them through
discussion or by updating the draft.

Document: draft-ietf-pce-stateful-hpce
Reviewer: Tal Mizrahi
Review Date: July, 2019
Intended Status: Informational

Summary:
No issues found. This document is ready for publication.

Nits:
-Section 1.1. is the only subsection of Section 1. Please consider adding a
subsection "Background" that will consist of the text before the current
1.1.
-"(previously computed paths" - there is no matching ")"
-Section 6.3 - please consider if this should be moved to the security
considerations section, or add a reference from the security considerations
section to this one.

Best regards,
Tal.

--000000000000e6026e058d125fce
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hello,<br><br>I have been selected as the Routing Director=
ate reviewer for this draft. The Routing Directorate seeks to review all ro=
uting or routing-related drafts as they pass through IETF last call and IES=
G review, and sometimes on special request. The purpose of the review is to=
 provide assistance to the Routing ADs. For more information about the Rout=
ing Directorate, please see <a href=3D"http://trac.tools.ietf.org/area/rtg/=
trac/wiki/RtgDir">http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir</a><=
br><br>Although these comments are primarily for the use of the Routing ADs=
, it would be helpful if you could consider them along with any other IETF =
Last Call comments that you receive, and strive to resolve them through dis=
cussion or by updating the draft.<br><br>Document: draft-ietf-pce-stateful-=
hpce<br>Reviewer: Tal Mizrahi<br>Review Date: July, 2019<br>Intended Status=
: Informational<br><br>Summary: <br>No issues found. This document is ready=
 for publication.<br><br>Nits:<br>-Section 1.1. is the only subsection of S=
ection 1. Please consider adding a subsection &quot;Background&quot; that w=
ill consist of the text before the current 1.1.<br>-&quot;(previously compu=
ted paths&quot; - there is no matching &quot;)&quot;<br>-Section 6.3 - plea=
se consider if this should be moved to the security considerations section,=
 or add a reference from the security considerations section to this one.<b=
r><div><br></div><div>Best regards,</div><div>Tal.</div></div>

--000000000000e6026e058d125fce--


From nobody Sun Jul  7 17:21:19 2019
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Subject: [Pce] I-D Action: draft-ietf-pce-stateful-pce-lsp-scheduling-08.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Path Computation Element WG of the IETF.

        Title           : PCEP Extensions for LSP scheduling with stateful PCE
        Authors         : Huaimo Chen
                          Yan Zhuang
                          Qin Wu
                          Daniele Ceccarelli
	Filename        : draft-ietf-pce-stateful-pce-lsp-scheduling-08.txt
	Pages           : 24
	Date            : 2019-07-07

Abstract:
   This document defines a set of extensions needed to the stateful Path
   Computation Element (PCE) communication Protocol (PCEP), so as to
   enable Labeled Switched Path (LSP) scheduling for path computation
   and LSP setup/deletion based on the actual network resource usage and
   the duration of a traffic service in a centralized network
   environment as stated in RFC 8413.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-pce-stateful-pce-lsp-scheduling/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-pce-stateful-pce-lsp-scheduling-08
https://datatracker.ietf.org/doc/html/draft-ietf-pce-stateful-pce-lsp-scheduling-08

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-stateful-pce-lsp-scheduling-08


Please note that it may take a couple of minutes from the time of submission
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From nobody Sun Jul  7 20:52:46 2019
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Subject: [Pce] I-D Action: draft-ietf-pce-stateful-hpce-11.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Path Computation Element WG of the IETF.

        Title           : Hierarchical Stateful Path Computation Element (PCE).
        Authors         : Dhruv Dhody
                          Young Lee
                          Daniele Ceccarelli
                          Jongyoon Shin
                          Daniel King
	Filename        : draft-ietf-pce-stateful-hpce-11.txt
	Pages           : 23
	Date            : 2019-07-07

Abstract:
   A Stateful Path Computation Element (PCE) maintains information on
   the current network state, including: computed Label Switched Path
   (LSPs), reserved resources within the network, and pending path
   computation requests. This information may then be considered when
   computing new traffic engineered LSPs, and for associated and
   dependent LSPs, received from Path Computation Clients (PCCs). The
   Path computation response from a PCE is helpful for the PCC to
   gracefully establish the computed LSP.

   The Hierarchical Path Computation Element (H-PCE) architecture,
   provides an architecture to allow the optimum sequence of
   inter-connected domains to be selected, and network policy to be
   applied if applicable, via the use of a hierarchical relationship
   between PCEs.

   Combining the capabilities of Stateful PCE and the Hierarchical PCE
   would be advantageous. This document describes general considerations
   and use cases for the deployment of Stateful, and not Stateless, PCEs
   using the Hierarchical PCE architecture.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-pce-stateful-hpce/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-pce-stateful-hpce-11
https://datatracker.ietf.org/doc/html/draft-ietf-pce-stateful-hpce-11

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-stateful-hpce-11


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

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From nobody Sun Jul  7 20:56:22 2019
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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Mon, 8 Jul 2019 09:25:35 +0530
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Subject: Re: [Pce] RtgDir review: draft-ietf-pce-stateful-hpce
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Hi Tal,

Thanks for your review.

I have made an update handling the nits.

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-pce-stateful-hpce-11

Thanks!
Dhruv

On Sun, Jul 7, 2019 at 1:05 PM Tal Mizrahi <tal.mizrahi.phd@gmail.com> wrot=
e:
>
> Hello,
>
> I have been selected as the Routing Directorate reviewer for this draft. =
The Routing Directorate seeks to review all routing or routing-related draf=
ts as they pass through IETF last call and IESG review, and sometimes on sp=
ecial request. The purpose of the review is to provide assistance to the Ro=
uting ADs. For more information about the Routing Directorate, please see h=
ttp://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir
>
> Although these comments are primarily for the use of the Routing ADs, it =
would be helpful if you could consider them along with any other IETF Last =
Call comments that you receive, and strive to resolve them through discussi=
on or by updating the draft.
>
> Document: draft-ietf-pce-stateful-hpce
> Reviewer: Tal Mizrahi
> Review Date: July, 2019
> Intended Status: Informational
>
> Summary:
> No issues found. This document is ready for publication.
>
> Nits:
> -Section 1.1. is the only subsection of Section 1. Please consider adding=
 a subsection "Background" that will consist of the text before the current=
 1.1.
> -"(previously computed paths" - there is no matching ")"
> -Section 6.3 - please consider if this should be moved to the security co=
nsiderations section, or add a reference from the security considerations s=
ection to this one.
>
> Best regards,
> Tal.


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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Mon, 8 Jul 2019 10:55:23 +0530
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Subject: Re: [Pce] Building the PCE WG Agenda for the IETF 105
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Hi WG,

As you rush to meet the I-D submission deadline today, also remember
to ask for the slots for the PCE WG session, with all the details as
per the below mail.

Also use the mailing list to introduce your new drafts or summarise
updates to get more eye balls before the WG session.

Thanks!
PCE Chairs & Secretary




On Mon, Jun 24, 2019 at 9:12 PM Hariharan Ananthakrishnan
<hari=40netflix.com@dmarc.ietf.org> wrote:
>
> Hi WG,
>
> The PCE WG session in Montreal is tentatively scheduled for Thursday
> Morning session I [1]. If you need some face-to-face time to progress
> some work, please send a slot request to the chairs by Monday July
> 8th including:
> - the draft(s) you want to discuss,
> - the expected presenter name,
> - the requested duration, including question time as part of the slot,
> - the reason why you want to be on the agenda; What do you want to
> achieve? Why is a presentation necessary to achieve it?
>
> Please note - Asking for a slot does not mean you will get one. We
> will be prioritizing moving WG work first as well as drafts that were
> discussed on the mailing list. Please make sure to introduce your new
> draft or summarize an update in the mailing list. The last date to
> submit drafts is also July 8th [2].
>
> Thanks!
> PCE Chairs & Secretary
>
> [1] https://datatracker.ietf.org/meeting/105/agenda.html
> [2] https://datatracker..ietf.org/meeting/important-dates/
> _______________________________________________
> Pce mailing list
> Pce@ietf.org
> https://www.ietf.org/mailman/listinfo/pce


From nobody Mon Jul  8 04:24:29 2019
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From: "Chengli (Cheng Li)" <chengli13@huawei.com>
To: "Siva Sivabalan (msiva)" <msiva@cisco.com>, Dhruv Dhody <dhruv.ietf@gmail.com>, "draft-sivabalan-pce-binding-label-sid@ietf.org" <draft-sivabalan-pce-binding-label-sid@ietf.org>
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From nobody Mon Jul  8 08:15:27 2019
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Subject: [Pce] I-D Action: draft-ietf-pce-pcep-extension-for-pce-controller-02.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Path Computation Element WG of the IETF.

        Title           : PCEP Procedures and Protocol Extensions for Using PCE as a Central Controller (PCECC) of LSPs
        Authors         : Quintin Zhao
                          Zhenbin Li
                          Mahendra Singh Negi
                          Chao Zhou
	Filename        : draft-ietf-pce-pcep-extension-for-pce-controller-02.txt
	Pages           : 35
	Date            : 2019-07-08

Abstract:
   The Path Computation Element (PCE) is a core component of Software-
   Defined Networking (SDN) systems.  It can compute optimal paths for
   traffic across a network and can also update the paths to reflect
   changes in the network or traffic demands.

   PCE was developed to derive paths for MPLS Label Switched Paths
   (LSPs), which are supplied to the head end of the LSP using the Path
   Computation Element Communication Protocol (PCEP).  But SDN has a
   broader applicability than signaled (G)MPLS traffic-engineered (TE)
   networks, and the PCE may be used to determine paths in a range of
   use cases.  PCEP has been proposed as a control protocol for use in
   these environments to allow the PCE to be fully enabled as a central
   controller.

   A PCE-based central controller (PCECC) can simplify the processing of
   a distributed control plane by blending it with elements of SDN and
   without necessarily completely replacing it.  Thus, the LSP can be
   calculated/setup/initiated and the label forwarding entries can also
   be downloaded through a centralized PCE server to each network
   devices along the path while leveraging the existing PCE technologies
   as much as possible.

   This document specifies the procedures and PCEP protocol extensions
   for using the PCE as the central controller.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-pce-pcep-extension-for-pce-controller/

There are also htmlized versions available at:
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From nobody Mon Jul  8 14:59:12 2019
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Path Computation Element WG of the IETF.

        Title           : Applicability of the Path Computation Element to Inter-Area and Inter-AS MPLS and GMPLS Traffic Engineering
        Authors         : Daniel King
                          Haomian Zheng
	Filename        : draft-ietf-pce-inter-area-as-applicability-08.txt
	Pages           : 25
	Date            : 2019-07-08

Abstract:
   The Path Computation Element (PCE) may be used for computing services
   that traverse multi-area and multi-AS Multiprotocol Label Switching
   (MPLS) and Generalized MPLS (GMPLS) Traffic Engineered (TE) networks.

   This document examines the applicability of the PCE architecture,
   protocols, and protocol extensions for computing multi-area and
   multi-AS paths in MPLS and GMPLS networks.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-pce-inter-area-as-applicability/

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A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-inter-area-as-applicability-08


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From nobody Tue Jul  9 06:35:39 2019
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From: Ines Robles via Datatracker <noreply@ietf.org>
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Subject: [Pce] Rtgdir last call review of draft-ietf-pce-stateful-path-protection-07
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Reviewer: Ines Robles
Review result: Ready

Hello,

I have been selected as the Routing Directorate reviewer for this draft. The
Routing Directorate seeks to review all routing or routing-related drafts as
they pass through IETF last call and IESG review, and sometimes on special
request. The purpose of the review is to provide assistance to the Routing ADs.
For more information about the Routing Directorate, please see
â€‹http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir

Although these comments are primarily for the use of the Routing ADs, it would
be helpful if you could consider them along with any other IETF Last Call
comments that you receive, and strive to resolve them through discussion or by
updating the draft.

Document: draft-ietf-pce-stateful-path-protection-07.txt
Reviewer: Ines Robes
Review Date: 09-07-2019
IETF LC End Date: --
Intended Status: Standards Track

Summary:

I believe the draft is technically good. This document is well written.

This document specifies a stateful PCEP extension to associate two or more LSPs
for the purpose of setting up path protection.

I have some minor questions.

Major Issues: No major issues found.

Minor Issues: No minor issues found.

Nits: from the tool ->   Summary: 0 errors (**), 0 flaws (~~), 3 warnings (==),
1 comment (--).

Comments/Questions:

1- about "..associate one working LSP with one or more protection LSPs..." -->
Is there a limit of numbers of protection LSPs to be associated with one
working LSP?

2- About Table 1: PPAG TLV, the name of the flag "S - STANDBY" should be
"Secondary" (S) as per Figure 1?

Thank you for this document,

Ines.



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Mirja KÃ¼hlewind has entered the following ballot position for
draft-ietf-pce-association-group-09: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

nit: s/The association type are defined/The associations type are defined/



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Thanks for the catch, Mirja.

But authors, please fix as "the association types are defined"

Thanks,
Adrian

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

nit: s/The association type are defined/The associations type are =
defined/



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Ups.. yes that=E2=80=99s what I meant=E2=80=A6


> On 9. Jul 2019, at 16:21, Adrian Farrel <adrian@olddog.co.uk> wrote:
>=20
> Thanks for the catch, Mirja.
>=20
> But authors, please fix as "the association types are defined"
>=20
> Thanks,
> Adrian
>=20
> -----Original Message-----
> From: Mirja K=C3=BChlewind via Datatracker <noreply@ietf.org>=20
> Sent: 09 July 2019 15:19
> To: The IESG <iesg@ietf.org>
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<julien.meuric@orange.com>; pce-chairs@ietf.org; =
julien.meuric@orange.com; pce@ietf.org
> Subject: Mirja K=C3=BChlewind's No Objection on =
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>=20
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>=20
>=20
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>=20
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>=20
>=20
>=20
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>=20
> nit: s/The association type are defined/The associations type are =
defined/
>=20
>=20
>=20


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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Hi,

thanks for this document, here are a couple of comments/questions.

   The PCEP ASSOC-Type-List TLV is optional.  It MAY be carried within
   an OPEN object sent by a PCEP speaker in an Open message to a PCEP
   peer so as to indicate the list of supported Association types.
This is said twice. (First paragraph of section 4.1) and then in 4.1.1:
   A PCEP speaker MAY include an ASSOC-Type-List TLV within an OPEN
   object in an Open message sent to a PCEP peer in order to advertise a
   set of one or more supported association types.
   The use of ASSOC-Type-List TLV is OPTIONAL.

It doesn't hurt, but you might want to consider saying this only once. Also I
note OPTIONAL vs optional

Sending ASSOC-Type-List TLV is optional but it might be mandatory to send some
to-be-defined Association types. Isn't that somehow conflicting?

The PCEP OP-CONF-ASSOC-RANGE TLV is optional.
OPTIONAL?

Could you clarify the difference between
a PCEP speaker does not recognize the ASSOCIATION object
and
a PCE peer is ... unable to process the ASSOCIATION
I see that the errors thrown are different.

Nits:
s/protections LSPs/protection LSPs/
s/The Assoc-type MAY appear more than once/A given Assoc-type MAY appear more
than once/ s/to uniquely identifying/to uniquely identify/



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DISCUSS:
----------------------------------------------------------------------

A tiny thing, trivial to fix:

â€” Section 2 â€”

   This document uses the following terms defined in [RFC8051]: Stateful
   PCE, Active Stateful PCE, Passive Stateful PCE, and Delegation.

I think this makes 8051 a normative reference.





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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Thank you  for the work put into this document. I have two COMMENTs and one
nits: all easy to fix

Regards,

-Ã©ric

== COMMENTS ==

-- Section 6.1 --

Please state the obvious: unused "Flags" bits MUST be set to 0.

-- Section 6.1.1 --

Figure 5 includes the type and length of the TLV while figure 1 in previous
section does not include the type and length field. Or am I misreading the
figures ?

== NITS ==

-- Section 4.1 (and others) --

The caption of figure 1 contains "TLV" but it is actually only about the "V" of
the "TLV" ;-) See above COMMENT



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From nobody Wed Jul 10 06:21:54 2019
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From: Dhruv Dhody <dhruv.dhody@huawei.com>
To: 'Martin Vigoureux' <martin.vigoureux@nokia.com>, The IESG <iesg@ietf.org>
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Subject: Re: [Pce] Martin Vigoureux's No Objection on draft-ietf-pce-association-group-09: (with COMMENT)
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Hi Martin,

Thanks for your review. See inline...

=20
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>=20
> Hi,
>=20
> thanks for this document, here are a couple of comments/questions.
>=20
>    The PCEP ASSOC-Type-List TLV is optional.  It MAY be carried within
>    an OPEN object sent by a PCEP speaker in an Open message to a PCEP
>    peer so as to indicate the list of supported Association types.
> This is said twice. (First paragraph of section 4.1) and then in 4.1.1:
>    A PCEP speaker MAY include an ASSOC-Type-List TLV within an OPEN
>    object in an Open message sent to a PCEP peer in order to advertise a
>    set of one or more supported association types.
>    The use of ASSOC-Type-List TLV is OPTIONAL.
>=20
> It doesn't hurt, but you might want to consider saying this only once.
> Also I note OPTIONAL vs optional
>=20
[[Dhruv Dhody]] Ack.=20


> Sending ASSOC-Type-List TLV is optional but it might be mandatory to send
> some to-be-defined Association types. Isn't that somehow conflicting?
>=20
[[Dhruv Dhody]] The aim was to say that right now this TLV is optional, but=
 a future association type (say disjoint) can specify that if you want to u=
se *this particular association type* you need to include the TLV. So if an=
 implementation does not support this particular association type, the TLV =
would be optional, and if it needs to support this, then the TLV becomes ma=
ndatory to include. =20

> The PCEP OP-CONF-ASSOC-RANGE TLV is optional.
> OPTIONAL?
>=20
[[Dhruv Dhody]] Ack.

> Could you clarify the difference between a PCEP speaker does not recogniz=
e
> the ASSOCIATION object and a PCE peer is ... unable to process the
> ASSOCIATION I see that the errors thrown are different.
>=20
[[Dhruv Dhody]] The difference is between ASSOCIATION Object being unknown =
(former) and Object being known *but* not supported/processed (latter). =20

> Nits:
> s/protections LSPs/protection LSPs/
> s/The Assoc-type MAY appear more than once/A given Assoc-type MAY appear
> more than once/ s/to uniquely identifying/to uniquely identify/
>=20
>
[[Dhruv Dhody]] Ack.=20
=20
Working Copy: https://raw.githubusercontent.com/dhruvdhody-huawei/ietf/mast=
er/draft-ietf-pce-association-group-10.txt
Diff: https://tools.ietf.org/rfcdiff?url1=3Ddraft-ietf-pce-association-grou=
p-09&url2=3Dhttps://raw.githubusercontent.com/dhruvdhody-huawei/ietf/master=
/draft-ietf-pce-association-group-10.txt

Thanks!=20
Dhruv

> _______________________________________________
> Pce mailing list
> Pce@ietf.org
> https://www.ietf.org/mailman/listinfo/pce


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From: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
To: Dhruv Dhody <dhruv.dhody@huawei.com>, The IESG <iesg@ietf.org>
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From: Dhruv Dhody <dhruv.dhody@huawei.com>
To: 'Barry Leiba' <barryleiba@computer.org>, The IESG <iesg@ietf.org>
CC: "pce@ietf.org" <pce@ietf.org>, "pce-chairs@ietf.org" <pce-chairs@ietf.org>, "draft-ietf-pce-association-group@ietf.org" <draft-ietf-pce-association-group@ietf.org>
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Subject: Re: [Pce] Barry Leiba's Discuss on draft-ietf-pce-association-group-09: (with DISCUSS)
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From: "Vigoureux, Martin (Nokia - FR/Paris-Saclay)" <martin.vigoureux@nokia.com>
To: Dhruv Dhody <dhruv.dhody@huawei.com>, The IESG <iesg@ietf.org>
CC: "pce@ietf.org" <pce@ietf.org>, "pce-chairs@ietf.org" <pce-chairs@ietf.org>, "draft-ietf-pce-association-group@ietf.org" <draft-ietf-pce-association-group@ietf.org>
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Subject: Re: [Pce] Martin Vigoureux's No Objection on draft-ietf-pce-association-group-09: (with COMMENT)
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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Wed, 10 Jul 2019 23:45:58 +0530
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To: "Vigoureux, Martin (Nokia - FR/Paris-Saclay)" <martin.vigoureux@nokia.com>
Cc: Dhruv Dhody <dhruv.dhody@huawei.com>, The IESG <iesg@ietf.org>, "pce@ietf.org" <pce@ietf.org>,  "pce-chairs@ietf.org" <pce-chairs@ietf.org>,  "draft-ietf-pce-association-group@ietf.org" <draft-ietf-pce-association-group@ietf.org>
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Subject: Re: [Pce] Martin Vigoureux's No Objection on draft-ietf-pce-association-group-09: (with COMMENT)
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Hi Martin,

Thanks for further discussion, see in-line..

<snip>
> >
> >
> >> Sending ASSOC-Type-List TLV is optional but it might be mandatory to s=
end
> >> some to-be-defined Association types. Isn't that somehow conflicting?
> >>
> > [[Dhruv Dhody]] The aim was to say that right now this TLV is optional,=
 but a future association type (say disjoint) can specify that if you want =
to use *this particular association type* you need to include the TLV. So i=
f an implementation does not support this particular association type, the =
TLV would be optional, and if it needs to support this, then the TLV become=
s mandatory to include.
>
> I understand the aim, but I fail to understand how it doesn't lead to
> conflicting requirements.
> This doc says, the whole TLV is optional.
> A future doc might say: this assoc-type in this TLV is mandatory.
>
> By construction the future doc is thus saying that the TLV is mandatory,
> which conflicts with the base spec.
>
> Couldn't you lay out the path for the future by saying something like:
> * MUST be sent if it contains at least an assoc-type which must be sent
> and MAY NOT be sent otherwise.
>

[Dhruv]: I agree, I can update the text to say -

   Association type (to be defined in other documents) can specify if
   the association type advertisement is mandatory for it.  Thus, the
   ASSOC-Type-List TLV MUST be included if at least one mandatory
   association type needs to be advertised and the ASSOC-Type-List TLV
   MAY be included otherwise.

I used MAY, as MAY NOT is not RFC 2119 keyword.

>
> As a side question, sorry I didn't go back to the doc, but how should
> the systems behave in the case where there are two assoc types: one
> mandatory and the other not.
> MUST the system advertise both in the list or can it only advertise the
> mandatory one? And how will the receiver treat that latter case? I'm
> asking because I think you cover the case of not sending the whole TLV
> and then the receiver MUST interpret that as an absence of information
> on the list of supported Association types (rather than the Association
> type is not supported), but if it receives the TLV without the assoc
> type, should it still interpret it as an absence of info or as not
> supported?
>

We have this text in the I-D that covers these conditions -

   For an association type that specifies
   that the advertisement is mandatory, a missing Assoc-type in the
   ASSOC-Type-List TLV (or missing ASSOC-Type-List TLV) is to be
   interpreted as the association type is not supported by the PCEP
   speaker.

   The absence of the ASSOC-Type-List TLV in an OPEN object MUST be
   interpreted as an absence of information on the list of supported
   Association types (rather than the Association type is not
   supported).  In this case, the PCEP speaker could still use the
   ASSOCIATION object: if the peer does not support the association, it
   will react as per the procedure described in Section 6.4.

   In case the use of the ASSOC-Type-List TLV is triggered by support
   for a mandatory association type, then it is RECOMMENDED that the
   PCEP implementation include all supported Association types
   (including optional) to ease the operations of the PCEP peer.

<snip>
> >
> >> Could you clarify the difference between a PCEP speaker does not recog=
nize
> >> the ASSOCIATION object and a PCE peer is ... unable to process the
> >> ASSOCIATION I see that the errors thrown are different.
> >>
> > [[Dhruv Dhody]] The difference is between ASSOCIATION Object being unkn=
own (former) and Object being known *but* not supported/processed (latter).
>
> That doesn't really clarify. What is the difference between unknown and
> not supported?

Unknown - I parse the PCEP object header, and find an object-type, I
dont know what this object type means and it is unknown.
Not Supported - I parse the PCEP object header, and find an
object-type that i am aware of but for some reason do not support.
This could be because of feature being disabled via configuration for
instance.

Note that these errors are defined in PCEP since its inception in RFC 5440.

Last Commit: https://github.com/dhruvdhody-huawei/ietf/commit/a00b161661a33=
4d800bab99dedbd2012e3951651

Please let me know if any further change is needed.

Thanks!
Dhruv

<snip>
> > Working Copy: https://raw.githubusercontent.com/dhruvdhody-huawei/ietf/=
master/draft-ietf-pce-association-group-10.txt
> > Diff: https://tools.ietf.org/rfcdiff?url1=3Ddraft-ietf-pce-association-=
group-09&url2=3Dhttps://raw.githubusercontent.com/dhruvdhody-huawei/ietf/ma=
ster/draft-ietf-pce-association-group-10.txt


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From: "Vigoureux, Martin (Nokia - FR/Paris-Saclay)" <martin.vigoureux@nokia.com>
To: Dhruv Dhody <dhruv.ietf@gmail.com>
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Subject: Re: [Pce] Martin Vigoureux's No Objection on draft-ietf-pce-association-group-09: (with COMMENT)
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From nobody Wed Jul 10 12:56:53 2019
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From: Barry Leiba <barryleiba@computer.org>
Date: Wed, 10 Jul 2019 15:56:28 -0400
Message-ID: <CALaySJ+Pbdqq_oCC+D2s-5KCYzKVZqntOB_+OVdefTJULFvbeg@mail.gmail.com>
To: Dhruv Dhody <dhruv.dhody@huawei.com>
Cc: The IESG <iesg@ietf.org>, "pce@ietf.org" <pce@ietf.org>,  "pce-chairs@ietf.org" <pce-chairs@ietf.org>,  "draft-ietf-pce-association-group@ietf.org" <draft-ietf-pce-association-group@ietf.org>
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Subject: Re: [Pce] Barry Leiba's Discuss on draft-ietf-pce-association-group-09: (with DISCUSS)
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Thanks, Dhruv.  I will go remove my DISCUSS now.

Barry

On Wed, Jul 10, 2019 at 11:31 AM Dhruv Dhody <dhruv.dhody@huawei.com> wrote=
:
>
> Hi Barry,
>
> I have fixed this in my working copy with RFC 8051 as normative reference=
. Will publish the update when the submission tool reopens.
>
> Working Copy: https://raw.githubusercontent.com/dhruvdhody-huawei/ietf/ma=
ster/draft-ietf-pce-association-group-10.txt
> Diff: https://tools.ietf.org/rfcdiff?url1=3Ddraft-ietf-pce-association-gr=
oup-09&url2=3Dhttps://raw.githubusercontent.com/dhruvdhody-huawei/ietf/mast=
er/draft-ietf-pce-association-group-10.txt
>
> Regards,
> Dhruv
>
>
> > -----Original Message-----
> > From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Barry Leiba via
> > Datatracker
> > Sent: 10 July 2019 12:06
> > To: The IESG <iesg@ietf.org>
> > Cc: pce@ietf.org; pce-chairs@ietf.org; draft-ietf-pce-association-
> > group@ietf.org
> > Subject: [Pce] Barry Leiba's Discuss on draft-ietf-pce-association-grou=
p-
> > 09: (with DISCUSS)
> >
> > Barry Leiba has entered the following ballot position for
> > draft-ietf-pce-association-group-09: Discuss
> >
> > When responding, please keep the subject line intact and reply to all
> > email addresses included in the To and CC lines. (Feel free to cut this
> > introductory paragraph, however.)
> >
> >
> > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.ht=
ml
> > for more information about IESG DISCUSS and COMMENT positions.
> >
> >
> > The document, along with other ballot positions, can be found here:
> > https://datatracker.ietf.org/doc/draft-ietf-pce-association-group/
> >
> >
> >
> > ----------------------------------------------------------------------
> > DISCUSS:
> > ----------------------------------------------------------------------
> >
> > A tiny thing, trivial to fix:
> >
> > =E2=80=94 Section 2 =E2=80=94
> >
> >    This document uses the following terms defined in [RFC8051]: Statefu=
l
> >    PCE, Active Stateful PCE, Passive Stateful PCE, and Delegation.
> >
> > I think this makes 8051 a normative reference.
> >
> >
> >
> >
> > _______________________________________________
> > Pce mailing list
> > Pce@ietf.org
> > https://www.ietf.org/mailman/listinfo/pce


From nobody Wed Jul 10 14:37:38 2019
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Suresh Krishnan has entered the following ballot position for
draft-ietf-pce-association-group-09: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

* Section 6.1.

   Association Source: 4 or 16 bytes - A valid IPv4 or IPv6 address that
   provides scoping for the Association ID.  See Section 6.1.3 for
   details.

If I understand correctly, the length of this field is not really 4 or 16 bytes
but rather fully dependent on the ASSOCIATION Object-Type. i.e. you cannot have
a 16 byte address here if the Object_Type is 1. If so, it would be good to
state this dependence explicitly. Suggest something like

  Association Source: Contains a valid IPv4 address (4 bytes) if  the
  ASSOCIATION Object-Type is 1 or a valid IPv6 address (16 bytes) if  the
  ASSOCIATION Object-Type is 2. It provides scoping for the Association ID. 
  See Section 6.1.3 for details.



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Subject: [Pce] =?utf-8?q?RFC_8637_on_Applicability_of_the_Path_Computatio?= =?utf-8?q?n_Element_=28PCE=29_to_the_Abstraction_and_Control_of_TE_Networ?= =?utf-8?b?a3MgKEFDVE4p?=
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A new Request for Comments is now available in online RFC libraries.

        
        RFC 8637

        Title:      Applicability of the Path Computation 
                    Element (PCE) to the Abstraction and 
                    Control of TE Networks (ACTN) 
        Author:     D. Dhody, 
                    Y. Lee,
                    D. Ceccarelli
        Status:     Informational
        Stream:     IETF
        Date:       July 2019
        Mailbox:    dhruv.ietf@gmail.com, 
                    younglee.tx@gmail.com, 
                    daniele.ceccarelli@ericsson.com
        Pages:      22
        Characters: 50279
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-pce-applicability-actn-12.txt

        URL:        https://www.rfc-editor.org/info/rfc8637

        DOI:        10.17487/RFC8637

Abstraction and Control of TE Networks (ACTN) refers to the set of
virtual network (VN) operations needed to orchestrate, control, and
manage large-scale multidomain TE networks so as to facilitate network
programmability, automation, efficient resource sharing, and
end-to-end virtual service-aware connectivity and network function
virtualization services.

The Path Computation Element (PCE) is a component, application, or
network node that is capable of computing a network path or route
based on a network graph and applying computational constraints.  The
PCE serves requests from Path Computation Clients (PCCs) that
communicate with it over a local API or using the Path Computation
Element Communication Protocol (PCEP).

This document examines the applicability of PCE to the ACTN framework.


This document is a product of the Path Computation Element Working Group of the IETF.


INFORMATIONAL: This memo provides information for the Internet community.
It does not specify an Internet standard of any kind. Distribution of
this memo is unlimited.

This announcement is sent to the IETF-Announce and rfc-dist lists.
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specifically noted otherwise on the RFC itself, all RFCs are for
unlimited distribution.


The RFC Editor Team
Association Management Solutions, LLC



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Hi Suresh,=20

Agreed, and updated in the working copy.=20

https://github.com/dhruvdhody-huawei/ietf/commit/4cfd450b0cef372c04340aed2d=
5cb3639887f631

Thanks!=20
Dhruv


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> Subject: [Pce] Suresh Krishnan's No Objection on draft-ietf-pce-
> association-group-09: (with COMMENT)
>=20
> Suresh Krishnan has entered the following ballot position for
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> COMMENT:
> ----------------------------------------------------------------------
>=20
> * Section 6.1.
>=20
>    Association Source: 4 or 16 bytes - A valid IPv4 or IPv6 address that
>    provides scoping for the Association ID.  See Section 6.1.3 for
>    details.
>=20
> If I understand correctly, the length of this field is not really 4 or 16
> bytes but rather fully dependent on the ASSOCIATION Object-Type. i.e. you
> cannot have a 16 byte address here if the Object_Type is 1. If so, it
> would be good to state this dependence explicitly. Suggest something like
>=20
>   Association Source: Contains a valid IPv4 address (4 bytes) if  the
>   ASSOCIATION Object-Type is 1 or a valid IPv6 address (16 bytes) if  the
>   ASSOCIATION Object-Type is 2. It provides scoping for the Association I=
D.
>   See Section 6.1.3 for details.
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Please expand "PCEP" in the document title.



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Noted. Updated in working copy. =20

https://github.com/dhruvdhody-huawei/ietf/commit/332ecadd8db5277cc52ad133cd=
4363e6aacd66c8#diff-053646eff5c15d4158c296a6542e2ba2


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> Please expand "PCEP" in the document title.
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

I'm always a little reluctant to publish framework documents without any
examples of using that framework (i.e., this document does not define
any association types), but this work seems well thought-out and it
looks like there are a handful of association types in development by
the WG.  Would it be worth listing a few as informational references to
give the reader a broader sense of what associations might be used for?

Thanks for the note in the shepherd writeup about the author count!

Thank you also for the very readable document -- it's clear that the
authors took care to organize the content in a manner accessible to
the reader.

As a general note, do we need to say anything about the multi-byte
integer values being encoded in network byte order?  (Perhaps following
RFC 5440's implicit convention is the right thing to do.)

Section 1

   [RFC6780] defines the RSVP ASSOCIATION object, which was defined in
   the context of GMPLS-controlled Label Switched Paths (LSPs) to be

nit: is this supposed to be  RFC 4872?

Section 3.3

   The dynamically created association can be reported to the PCEP peer
   via the PCEP messages as per the stateful extensions.  While the
   operator-configured association is known to the PCEP peer before
   hand, a PCEP peer could ask for a LSP to join the operator-configured
   association via the stateful PCEP messages.

nit: I suggest s/While/When/, if I understand correctly.

   Multiple types of associations can exist, each with their own
   association identifier space.  The definition of the different
   association types and their behaviours is outside the scope of this
   document.  The establishment and removal of the association
   relationship can be done on a per LSP basis.  An LSP may join
   multiple association groups, of different or of the same association
   type.

Is it possible for an LSP to join multiple association groups of the
same type and then for configuration to be assigned to two groups in a
manner that conflicts?  What procedure is used for conflict resolution
in such a case?

Section 3.4

   Association identifier range for sources other than the PCEP speaker
   (for example an NMS system) is not communicated in PCEP and the
   procedure for operator-configured association range setting is
   outside the scope of this document.

Given the discussion in the rest of the document, it seems that
reserving a specific range for operator configuration (across all
association types) is too rigid to meet the various anticipated use
cases.  Is that a correct assessment?

Section 5.1

   If the Assoc-type is not recognized or supported by the PCEP speaker,
   it MUST ignore that respective Start-Assoc-ID and Range.  If the
   Start-Assoc-ID or Range are set incorrectly, the PCEP session MUST be
   rejected with error type 1 and error value 1 (PCEP session
   establishment failure / Reception of an invalid Open message).

I could maybe see competent engineers disagreeing about which of these
MUSTs would take precedence in a case where both apply.

   The Assoc-type MAY appear more than once in the OP-CONF-ASSOC-RANGE
   TLV in the case of a non-contiguous Operator-configured Association
   Range.  The PCEP speaker originating this TLV MUST NOT carry
   overlapping ranges for an association type.  If a PCEP peer receives
   overlapping ranges for an association type, it MUST consider the Open
   message malformed and MUST reject the PCEP session with error type 1
   and error value 1 (PCEP session establishment failure / Reception of
   an invalid Open message).

This might be a good place to specify the  handling if a
received range would cross the 0xffff boundary.

Section 6.1.1

   The Global Association Source TLV is an optional TLV for use in the
   Association Object.  The meaning and the usage of Global Association
   Source is as per [RFC6780].

Do we want to say Section 4 specifically of 6780?
(Similarly for Extended Association ID.)

Section 6.1.4

   the association group.  In this document, all these fields are called
   'association parameters'.  Note that the ASSOCIATION object MAY

I would humbly suggest s/all these fields are called 'association
parameters'/these fields are collectively called 'association
parameters'/.

Section 6.3.1

   The ASSOCIATION Object is OPTIONAL and MAY be carried in the Path
   Computation Update (PCUpd), Path Computation Report (PCRpt) and Path
   Computation Initiate (PCInitiate) messages.

   When carried in PCRpt message, it is used to report the association
   group membership pertaining to a LSP to a stateful PCE.  The PCRpt
   message are used for both initial state synchronization operations
   (Section 5.6 of [RFC8231]) as well as whenever the state of the LSP
   changes.  The associations MUST be included during the state
   synchronization operations.

I suspect this is just my hazy memory of OPTIONAL, but how does "MUST be
included" match up with "OPTIONAL".

Section 6.4

Do I understand correctly that for dynamically created association
groups, the creation is effected by just using the relevant parameters
in a request(/update/etc.) and there is no need to separately create or
allocate the association?

   If a PCE peer is unwilling or unable to process the ASSOCIATION
   object, it MUST return a PCErr message with the Error-Type "Not
   supported object" and follow the relevant procedures described in
   [RFC5440].  [...]

Does this imply that the P flag in the common header should always be
set for ASSOCIATION objects?

   In case the LSP is delegated to another PCE on session failure, the
   associations (and association information) set by the PCE remains
   intact, unless updated by the new PCE that takes over.

This includes the association source address?

Section 8

   attack vector.  An attacker could report too many associations in an
   attempt to load the PCEP peer.  The PCEP peer responds with PCErr as

"report" in the sense of causing the peer to create state to track them?

Section 12.2

Since the RFC 7525 procedures are RECOMMENDED, I think that reference
needs to be normative.



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Subject: Re: [Pce] Suresh Krishnan's No Objection on draft-ietf-pce-association-group-09: (with COMMENT)
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> On Jul 11, 2019, at 2:17 AM, Dhruv Dhody <dhruv.dhody@huawei.com> wrote:
>=20
> Hi Suresh,=20
>=20
> Agreed, and updated in the working copy.=20
>=20
> https://github.com/dhruvdhody-huawei/ietf/commit/4cfd450b0cef372c04340aed=
2d5cb3639887f631

Thanks Dhruv. Looks good to me.

Regards
Suresh


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From: Dhruv Dhody <dhruv.dhody@huawei.com>
To: 'Benjamin Kaduk' <kaduk@mit.edu>, The IESG <iesg@ietf.org>
CC: "pce@ietf.org" <pce@ietf.org>, "pce-chairs@ietf.org" <pce-chairs@ietf.org>, "draft-ietf-pce-association-group@ietf.org" <draft-ietf-pce-association-group@ietf.org>
Thread-Topic: [Pce] Benjamin Kaduk's No Objection on draft-ietf-pce-association-group-09: (with COMMENT)
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Subject: Re: [Pce] Benjamin Kaduk's No Objection on draft-ietf-pce-association-group-09: (with COMMENT)
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Hi Benjamin,=20

Thanks for your review, please see inline..=20

> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>=20
> I'm always a little reluctant to publish framework documents without any
> examples of using that framework (i.e., this document does not define any
> association types), but this work seems well thought-out and it looks lik=
e
> there are a handful of association types in development by the WG.  Would
> it be worth listing a few as informational references to give the reader =
a
> broader sense of what associations might be used for?
>=20
[[Dhruv Dhody]] Added.=20

> Thanks for the note in the shepherd writeup about the author count!
>=20
> Thank you also for the very readable document -- it's clear that the
> authors took care to organize the content in a manner accessible to the
> reader.
>=20
> As a general note, do we need to say anything about the multi-byte intege=
r
> values being encoded in network byte order?  (Perhaps following RFC 5440'=
s
> implicit convention is the right thing to do.)
>=20
[[Dhruv Dhody]] In PCEP extensions, this has been implicit. =20

> Section 1
>=20
>    [RFC6780] defines the RSVP ASSOCIATION object, which was defined in
>    the context of GMPLS-controlled Label Switched Paths (LSPs) to be
>=20
> nit: is this supposed to be  RFC 4872?
>=20
[[Dhruv Dhody]] Ack. =20

> Section 3.3
>=20
>    The dynamically created association can be reported to the PCEP peer
>    via the PCEP messages as per the stateful extensions.  While the
>    operator-configured association is known to the PCEP peer before
>    hand, a PCEP peer could ask for a LSP to join the operator-configured
>    association via the stateful PCEP messages.
>=20
> nit: I suggest s/While/When/, if I understand correctly.
>=20
[[Dhruv Dhody]] Updated.=20

>    Multiple types of associations can exist, each with their own
>    association identifier space.  The definition of the different
>    association types and their behaviours is outside the scope of this
>    document.  The establishment and removal of the association
>    relationship can be done on a per LSP basis.  An LSP may join
>    multiple association groups, of different or of the same association
>    type.
>=20
> Is it possible for an LSP to join multiple association groups of the same
> type and then for configuration to be assigned to two groups in a manner
> that conflicts?  What procedure is used for conflict resolution in such a
> case?
>=20
[[Dhruv Dhody]] This should be handled per association type. I will make su=
re that future documents that define association types include text for thi=
s.=20

> Section 3.4
>=20
>    Association identifier range for sources other than the PCEP speaker
>    (for example an NMS system) is not communicated in PCEP and the
>    procedure for operator-configured association range setting is
>    outside the scope of this document.
>=20
> Given the discussion in the rest of the document, it seems that reserving
> a specific range for operator configuration (across all association types=
)
> is too rigid to meet the various anticipated use cases.  Is that a correc=
t
> assessment?
>=20
[[Dhruv Dhody]] Yes.=20

> Section 5.1
>=20
>    If the Assoc-type is not recognized or supported by the PCEP speaker,
>    it MUST ignore that respective Start-Assoc-ID and Range.  If the
>    Start-Assoc-ID or Range are set incorrectly, the PCEP session MUST be
>    rejected with error type 1 and error value 1 (PCEP session
>    establishment failure / Reception of an invalid Open message).
>=20
> I could maybe see competent engineers disagreeing about which of these
> MUSTs would take precedence in a case where both apply.
[[Dhruv Dhody]] Updated.=20

   If the Assoc-type is not recognized or supported by the PCEP speaker,
   it MUST ignore that respective Start-Assoc-ID and Range.  If the
   Assoc-type is recognized/supported but the Start-Assoc-ID or Range
   are set incorrectly, the PCEP session MUST be rejected with error
   type 1 and error value 1 (PCEP session establishment failure /
   Reception of an invalid Open message). =20

>=20
>    The Assoc-type MAY appear more than once in the OP-CONF-ASSOC-RANGE
>    TLV in the case of a non-contiguous Operator-configured Association
>    Range.  The PCEP speaker originating this TLV MUST NOT carry
>    overlapping ranges for an association type.  If a PCEP peer receives
>    overlapping ranges for an association type, it MUST consider the Open
>    message malformed and MUST reject the PCEP session with error type 1
>    and error value 1 (PCEP session establishment failure / Reception of
>    an invalid Open message).
>=20
> This might be a good place to specify the  handling if a received range
> would cross the 0xffff boundary.
>=20
[[Dhruv Dhody]] Added -=20

   The incorrect range include
   the case when the (Start-Assoc-ID + Range) crosses the association
   identifier range of 0xffff.


> Section 6.1.1
>=20
>    The Global Association Source TLV is an optional TLV for use in the
>    Association Object.  The meaning and the usage of Global Association
>    Source is as per [RFC6780].
>=20
> Do we want to say Section 4 specifically of 6780?
> (Similarly for Extended Association ID.)
>=20
[[Dhruv Dhody]] Ack.=20

> Section 6.1.4
>=20
>    the association group.  In this document, all these fields are called
>    'association parameters'.  Note that the ASSOCIATION object MAY
>=20
> I would humbly suggest s/all these fields are called 'association
> parameters'/these fields are collectively called 'association parameters'=
/.
>=20
[[Dhruv Dhody]] Ack.=20

> Section 6.3.1
>=20
>    The ASSOCIATION Object is OPTIONAL and MAY be carried in the Path
>    Computation Update (PCUpd), Path Computation Report (PCRpt) and Path
>    Computation Initiate (PCInitiate) messages.
>=20
>    When carried in PCRpt message, it is used to report the association
>    group membership pertaining to a LSP to a stateful PCE.  The PCRpt
>    message are used for both initial state synchronization operations
>    (Section 5.6 of [RFC8231]) as well as whenever the state of the LSP
>    changes.  The associations MUST be included during the state
>    synchronization operations.
>=20
> I suspect this is just my hazy memory of OPTIONAL, but how does "MUST be
> included" match up with "OPTIONAL".
>=20
[[Dhruv Dhody]] Added this -=20

   If the LSP belongs to an association group, then the
   associations MUST be included during the state synchronization
   operations.

> Section 6.4
>=20
> Do I understand correctly that for dynamically created association groups=
,
> the creation is effected by just using the relevant parameters in a
> request(/update/etc.) and there is no need to separately create or
> allocate the association?
>=20
>    If a PCE peer is unwilling or unable to process the ASSOCIATION
>    object, it MUST return a PCErr message with the Error-Type "Not
>    supported object" and follow the relevant procedures described in
>    [RFC5440].  [...]
>=20
> Does this imply that the P flag in the common header should always be set
> for ASSOCIATION objects?
>=20
[[Dhruv Dhody]] No, that was not the intention. I have made this change -=20

   If a PCEP speaker does not recognize the ASSOCIATION object in the
   stateful message, it will return a PCErr message with Error-Type
   "Unknown Object" as described in [RFC5440].  In case of PCReq
   message, the PCE would react based on the P flag as per [RFC5440].

   If a PCE peer is unwilling or unable to process the ASSOCIATION
   object in the stateful message, it MUST return a PCErr message with
   the Error-Type "Not supported object" and follow the relevant
   procedures described in [RFC5440].  In case of PCReq message, the PCE
   would react based on the P flag as per [RFC5440].

>    In case the LSP is delegated to another PCE on session failure, the
>    associations (and association information) set by the PCE remains
>    intact, unless updated by the new PCE that takes over.
>=20
> This includes the association source address?
>=20
[[Dhruv Dhody]] Yes. If the association source needs to change, then the ne=
w PCE would create a new association with itself as source and remove the o=
ld one.=20

> Section 8
>=20
>    attack vector.  An attacker could report too many associations in an
>    attempt to load the PCEP peer.  The PCEP peer responds with PCErr as
>=20
> "report" in the sense of causing the peer to create state to track them?
>=20
[[Dhruv Dhody]] Yes, basically to overwhelm the peer.

> Section 12.2
>=20
> Since the RFC 7525 procedures are RECOMMENDED, I think that reference
> needs to be normative.
>=20
[[Dhruv Dhody]] Ack.=20

Working Copy: https://raw.githubusercontent.com/dhruvdhody-huawei/ietf/mast=
er/draft-ietf-pce-association-group-10.txt
Diff: https://tools.ietf.org/rfcdiff?url1=3Ddraft-ietf-pce-association-grou=
p-09&url2=3Dhttps://raw.githubusercontent.com/dhruvdhody-huawei/ietf/master=
/draft-ietf-pce-association-group-10.txt

Thanks!=20
Dhruv

>=20
> _______________________________________________
> Pce mailing list
> Pce@ietf.org
> https://www.ietf.org/mailman/listinfo/pce


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Date: Thu, 11 Jul 2019 17:01:06 -0500
From: Benjamin Kaduk <kaduk@mit.edu>
To: Dhruv Dhody <dhruv.dhody@huawei.com>
Cc: The IESG <iesg@ietf.org>, "pce@ietf.org" <pce@ietf.org>, "pce-chairs@ietf.org" <pce-chairs@ietf.org>, "draft-ietf-pce-association-group@ietf.org" <draft-ietf-pce-association-group@ietf.org>
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Subject: Re: [Pce] Benjamin Kaduk's No Objection on draft-ietf-pce-association-group-09: (with COMMENT)
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Hi Dhruv,

Also inline

On Thu, Jul 11, 2019 at 02:17:56PM +0000, Dhruv Dhody wrote:
> Hi Benjamin, 
> 
> Thanks for your review, please see inline.. 
> 
> > ----------------------------------------------------------------------
> > COMMENT:
> > ----------------------------------------------------------------------
> > 
> > I'm always a little reluctant to publish framework documents without any
> > examples of using that framework (i.e., this document does not define any
> > association types), but this work seems well thought-out and it looks like
> > there are a handful of association types in development by the WG.  Would
> > it be worth listing a few as informational references to give the reader a
> > broader sense of what associations might be used for?
> > 
> [[Dhruv Dhody]] Added. 

Thanks!

> > Thanks for the note in the shepherd writeup about the author count!
> > 
> > Thank you also for the very readable document -- it's clear that the
> > authors took care to organize the content in a manner accessible to the
> > reader.
> > 
> > As a general note, do we need to say anything about the multi-byte integer
> > values being encoded in network byte order?  (Perhaps following RFC 5440's
> > implicit convention is the right thing to do.)
> > 
> [[Dhruv Dhody]] In PCEP extensions, this has been implicit.  

Okay; that's what it looked like to me, but there's no harm in checking.

> > Section 1
> > 
> >    [RFC6780] defines the RSVP ASSOCIATION object, which was defined in
> >    the context of GMPLS-controlled Label Switched Paths (LSPs) to be
> > 
> > nit: is this supposed to be  RFC 4872?
> > 
> [[Dhruv Dhody]] Ack.  
> 
> > Section 3.3
> > 
> >    The dynamically created association can be reported to the PCEP peer
> >    via the PCEP messages as per the stateful extensions.  While the
> >    operator-configured association is known to the PCEP peer before
> >    hand, a PCEP peer could ask for a LSP to join the operator-configured
> >    association via the stateful PCEP messages.
> > 
> > nit: I suggest s/While/When/, if I understand correctly.
> > 
> [[Dhruv Dhody]] Updated. 
> 
> >    Multiple types of associations can exist, each with their own
> >    association identifier space.  The definition of the different
> >    association types and their behaviours is outside the scope of this
> >    document.  The establishment and removal of the association
> >    relationship can be done on a per LSP basis.  An LSP may join
> >    multiple association groups, of different or of the same association
> >    type.
> > 
> > Is it possible for an LSP to join multiple association groups of the same
> > type and then for configuration to be assigned to two groups in a manner
> > that conflicts?  What procedure is used for conflict resolution in such a
> > case?
> > 
> [[Dhruv Dhody]] This should be handled per association type. I will make sure that future documents that define association types include text for this. 

Okay; thank you.

> > Section 3.4
> > 
> >    Association identifier range for sources other than the PCEP speaker
> >    (for example an NMS system) is not communicated in PCEP and the
> >    procedure for operator-configured association range setting is
> >    outside the scope of this document.
> > 
> > Given the discussion in the rest of the document, it seems that reserving
> > a specific range for operator configuration (across all association types)
> > is too rigid to meet the various anticipated use cases.  Is that a correct
> > assessment?
> > 
> [[Dhruv Dhody]] Yes. 
> 
> > Section 5.1
> > 
> >    If the Assoc-type is not recognized or supported by the PCEP speaker,
> >    it MUST ignore that respective Start-Assoc-ID and Range.  If the
> >    Start-Assoc-ID or Range are set incorrectly, the PCEP session MUST be
> >    rejected with error type 1 and error value 1 (PCEP session
> >    establishment failure / Reception of an invalid Open message).
> > 
> > I could maybe see competent engineers disagreeing about which of these
> > MUSTs would take precedence in a case where both apply.
> [[Dhruv Dhody]] Updated. 
> 
>    If the Assoc-type is not recognized or supported by the PCEP speaker,
>    it MUST ignore that respective Start-Assoc-ID and Range.  If the
>    Assoc-type is recognized/supported but the Start-Assoc-ID or Range
>    are set incorrectly, the PCEP session MUST be rejected with error
>    type 1 and error value 1 (PCEP session establishment failure /
>    Reception of an invalid Open message).  
> 
> > 
> >    The Assoc-type MAY appear more than once in the OP-CONF-ASSOC-RANGE
> >    TLV in the case of a non-contiguous Operator-configured Association
> >    Range.  The PCEP speaker originating this TLV MUST NOT carry
> >    overlapping ranges for an association type.  If a PCEP peer receives
> >    overlapping ranges for an association type, it MUST consider the Open
> >    message malformed and MUST reject the PCEP session with error type 1
> >    and error value 1 (PCEP session establishment failure / Reception of
> >    an invalid Open message).
> > 
> > This might be a good place to specify the  handling if a received range
> > would cross the 0xffff boundary.
> > 
> [[Dhruv Dhody]] Added - 
> 
>    The incorrect range include
>    the case when the (Start-Assoc-ID + Range) crosses the association
>    identifier range of 0xffff.
> 
> 
> > Section 6.1.1
> > 
> >    The Global Association Source TLV is an optional TLV for use in the
> >    Association Object.  The meaning and the usage of Global Association
> >    Source is as per [RFC6780].
> > 
> > Do we want to say Section 4 specifically of 6780?
> > (Similarly for Extended Association ID.)
> > 
> [[Dhruv Dhody]] Ack. 
> 
> > Section 6.1.4
> > 
> >    the association group.  In this document, all these fields are called
> >    'association parameters'.  Note that the ASSOCIATION object MAY
> > 
> > I would humbly suggest s/all these fields are called 'association
> > parameters'/these fields are collectively called 'association parameters'/.
> > 
> [[Dhruv Dhody]] Ack. 
> 
> > Section 6.3.1
> > 
> >    The ASSOCIATION Object is OPTIONAL and MAY be carried in the Path
> >    Computation Update (PCUpd), Path Computation Report (PCRpt) and Path
> >    Computation Initiate (PCInitiate) messages.
> > 
> >    When carried in PCRpt message, it is used to report the association
> >    group membership pertaining to a LSP to a stateful PCE.  The PCRpt
> >    message are used for both initial state synchronization operations
> >    (Section 5.6 of [RFC8231]) as well as whenever the state of the LSP
> >    changes.  The associations MUST be included during the state
> >    synchronization operations.
> > 
> > I suspect this is just my hazy memory of OPTIONAL, but how does "MUST be
> > included" match up with "OPTIONAL".
> > 
> [[Dhruv Dhody]] Added this - 
> 
>    If the LSP belongs to an association group, then the
>    associations MUST be included during the state synchronization
>    operations.

Ah, that helps; thank you.

> > Section 6.4
> > 
> > Do I understand correctly that for dynamically created association groups,
> > the creation is effected by just using the relevant parameters in a
> > request(/update/etc.) and there is no need to separately create or
> > allocate the association?
> > 
> >    If a PCE peer is unwilling or unable to process the ASSOCIATION
> >    object, it MUST return a PCErr message with the Error-Type "Not
> >    supported object" and follow the relevant procedures described in
> >    [RFC5440].  [...]
> > 
> > Does this imply that the P flag in the common header should always be set
> > for ASSOCIATION objects?
> > 
> [[Dhruv Dhody]] No, that was not the intention. I have made this change - 
> 
>    If a PCEP speaker does not recognize the ASSOCIATION object in the
>    stateful message, it will return a PCErr message with Error-Type
>    "Unknown Object" as described in [RFC5440].  In case of PCReq
>    message, the PCE would react based on the P flag as per [RFC5440].
> 
>    If a PCE peer is unwilling or unable to process the ASSOCIATION
>    object in the stateful message, it MUST return a PCErr message with
>    the Error-Type "Not supported object" and follow the relevant
>    procedures described in [RFC5440].  In case of PCReq message, the PCE
>    would react based on the P flag as per [RFC5440].

I think I may have just confused myself previously; feel free to rever this
change if you don't think it's helpful.

> >    In case the LSP is delegated to another PCE on session failure, the
> >    associations (and association information) set by the PCE remains
> >    intact, unless updated by the new PCE that takes over.
> > 
> > This includes the association source address?
> > 
> [[Dhruv Dhody]] Yes. If the association source needs to change, then the new PCE would create a new association with itself as source and remove the old one. 

Thanks for confirming.  I don't necessarily think there needs to be any
change to the text, here, since the current text is unambiguous.

> > Section 8
> > 
> >    attack vector.  An attacker could report too many associations in an
> >    attempt to load the PCEP peer.  The PCEP peer responds with PCErr as
> > 
> > "report" in the sense of causing the peer to create state to track them?
> > 
> [[Dhruv Dhody]] Yes, basically to overwhelm the peer.

Okay. I might suggest "attempt to create" instead of "report", but I
recognize that there are reasons to use "report" in the context of PCRpt.

Thanks for all the updates!

-Ben

> > Section 12.2
> > 
> > Since the RFC 7525 procedures are RECOMMENDED, I think that reference
> > needs to be normative.
> > 
> [[Dhruv Dhody]] Ack. 
> 
> Working Copy: https://raw.githubusercontent.com/dhruvdhody-huawei/ietf/master/draft-ietf-pce-association-group-10.txt
> Diff: https://tools.ietf.org/rfcdiff?url1=draft-ietf-pce-association-group-09&url2=https://raw.githubusercontent.com/dhruvdhody-huawei/ietf/master/draft-ietf-pce-association-group-10.txt
> 
> Thanks! 
> Dhruv
> 
> > 
> > _______________________________________________
> > Pce mailing list
> > Pce@ietf.org
> > https://www.ietf.org/mailman/listinfo/pce


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From: Dhruv Dhody <dhruv.dhody@huawei.com>
To: Benjamin Kaduk <kaduk@mit.edu>
CC: The IESG <iesg@ietf.org>, "pce@ietf.org" <pce@ietf.org>, "pce-chairs@ietf.org" <pce-chairs@ietf.org>, "draft-ietf-pce-association-group@ietf.org" <draft-ietf-pce-association-group@ietf.org>
Thread-Topic: [Pce] Benjamin Kaduk's No Objection on draft-ietf-pce-association-group-09: (with COMMENT)
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Subject: Re: [Pce] Benjamin Kaduk's No Objection on draft-ietf-pce-association-group-09: (with COMMENT)
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Hi Ben,=20

> > >    If a PCE peer is unwilling or unable to process the ASSOCIATION
> > >    object, it MUST return a PCErr message with the Error-Type "Not
> > >    supported object" and follow the relevant procedures described in
> > >    [RFC5440].  [...]
> > >
> > > Does this imply that the P flag in the common header should always
> > > be set for ASSOCIATION objects?
> > >
> > [[Dhruv Dhody]] No, that was not the intention. I have made this
> > change -
> >
> >    If a PCEP speaker does not recognize the ASSOCIATION object in the
> >    stateful message, it will return a PCErr message with Error-Type
> >    "Unknown Object" as described in [RFC5440].  In case of PCReq
> >    message, the PCE would react based on the P flag as per [RFC5440].
> >
> >    If a PCE peer is unwilling or unable to process the ASSOCIATION
> >    object in the stateful message, it MUST return a PCErr message with
> >    the Error-Type "Not supported object" and follow the relevant
> >    procedures described in [RFC5440].  In case of PCReq message, the PC=
E
> >    would react based on the P flag as per [RFC5440].
>=20
> I think I may have just confused myself previously; feel free to rever
> this change if you don't think it's helpful.
>=20

[[Dhruv Dhody]] The extra text for PCReq doesn't hurt. So I would let the u=
pdate stay.=20

> > > Section 8
> > >
> > >    attack vector.  An attacker could report too many associations in
> an
> > >    attempt to load the PCEP peer.  The PCEP peer responds with PCErr
> > > as
> > >
> > > "report" in the sense of causing the peer to create state to track
> them?
> > >
> > [[Dhruv Dhody]] Yes, basically to overwhelm the peer.
>=20
> Okay. I might suggest "attempt to create" instead of "report", but I
> recognize that there are reasons to use "report" in the context of PCRpt.
>=20
[[Dhruv Dhody]] Ack.=20

Working Copy: https://raw.githubusercontent.com/dhruvdhody-huawei/ietf/mast=
er/draft-ietf-pce-association-group-10.txt
Diff: https://tools.ietf.org/rfcdiff?url1=3Ddraft-ietf-pce-association-grou=
p-09&url2=3Dhttps://raw.githubusercontent.com/dhruvdhody-huawei/ietf/master=
/draft-ietf-pce-association-group-10.txt

Thanks for your detailed reviews.=20

Dhruv

> Thanks for all the updates!
>=20
> -Ben
>=20


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Subject: [Pce] When LSP belongs to multiple association groups of the same association type...
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Hi Authors, WG,

Please refer to this exchange with Benjamin regarding
draft-ietf-pce-association-group

--

>    Multiple types of associations can exist, each with their own
>    association identifier space.  The definition of the different
>    association types and their behaviours is outside the scope of this
>    document.  The establishment and removal of the association
>    relationship can be done on a per LSP basis.  An LSP may join
>    multiple association groups, of different or of the same association
>    type.
>
> Is it possible for an LSP to join multiple association groups of the same
> type and then for configuration to be assigned to two groups in a manner
> that conflicts?  What procedure is used for conflict resolution in such a
> case?
>
[[Dhruv Dhody]] This should be handled per association type. I will
make sure that future documents that define association types include
text for this.

--

We should update the I-Ds that define association types to include text on
what should be done when an LSP tries to join multiple association group of
the same association-type? And if it is allowed, what to do in case of
conflicts.

There are cases where taking this input into account is straightforward.
Multiple association of a given type may either be natively supported (e.g.,
the diversity I-D already mentions it) or obviously excluded (e.g., the
bidirectional association falls into this kind).  Sometimes, the resulting
behavior may require more specification on failure techniques: e.g., what
should a PCC do if requested a 1:3 protection while it only supports dedicated
protection?

Request the authors to think about this and make suitable update based on the
individual association type. The post WGLC I-Ds could be updated as part of
directorate review update.

Thoughts?

Thanks!
PCE Chairs


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Subject: [Pce] Preliminary PCE WG agenda for IETF 105
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Hi WG,

The preliminary PCE WG agenda for IETF 105 is published at -
https://datatracker.ietf.org/doc/agenda-105-pce/

--

To those on the agenda, do think about how to best utilise the
valuable F2F time during the meeting and what do you want to achieve
with your time. Please keep some time for Q&A and receiving feedback.

Please send your slides to pce-chairs@ietf.org by Monday the 22nd 1200
(local time); in order for us to upload material in advance for the
meeting.

In your slides make sure to focus on the open issues and the recent
changes in your draft. Do consider sending slides in a PDF format to
avoid any unexpected formatting issues.

We urge you use the mailing list to introduce your new drafts, the
latest changes, list any open issues, socialise new ideas, ask for
feedback etc.

--

To authors of WG I-D, please check the WG Wiki at
https://trac.ietf.org/trac/pce/wiki and in case any change is required
for your I-D, you could send a note to pce-chairs@ietf.org. We would
use this information to prepare the WG status report.

--

Thanks!
PCE WG Secretary & Chairs

--000000000000b0345c058d7e5ae7
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:small"><fo=
nt face=3D"verdana, sans-serif">Hi WG,<br style=3D""><br style=3D"">The pre=
liminary PCE WG agenda for IETF 105 is published at -<br style=3D""><a href=
=3D"https://datatracker.ietf.org/doc/agenda-105-pce/" rel=3D"noreferrer" ta=
rget=3D"_blank" style=3D"">https://datatracker.ietf.org/doc/agenda-105-pce/=
</a><br style=3D""><br style=3D"">--<br style=3D""><br style=3D"">To those =
on the agenda, do think about how to best utilise the<br style=3D"">valuabl=
e F2F time during the meeting and what do you want to achieve<br style=3D""=
>with your time. Please keep some time for Q&amp;A and receiving feedback.<=
br style=3D""><br style=3D"">Please send your slides to=C2=A0<a href=3D"mai=
lto:pce-chairs@ietf.org" target=3D"_blank" style=3D"">pce-chairs@ietf.org</=
a>=C2=A0by Monday the 22nd 1200<br style=3D"">(local time); in order for us=
 to upload material in advance for the<br style=3D"">meeting.<br style=3D""=
><br style=3D"">In your slides make sure to focus on the open issues and th=
e recent<br style=3D"">changes in your draft. Do consider sending slides in=
 a PDF format to<br style=3D"">avoid any unexpected formatting issues.<br s=
tyle=3D""><br style=3D"">We urge you use the mailing list to introduce your=
 new drafts, the<br style=3D"">latest changes, list any open issues, social=
ise new ideas, ask for<br style=3D"">feedback etc.<br style=3D""><br style=
=3D"">--<br style=3D""><br style=3D"">To authors of WG I-D, please check th=
e WG Wiki at<br style=3D""><a href=3D"https://trac.ietf.org/trac/pce/wiki" =
rel=3D"noreferrer" target=3D"_blank" style=3D"">https://trac.ietf.org/trac/=
pce/wiki</a>=C2=A0and in case any change is required<br style=3D"">for your=
 I-D, you could send a note to=C2=A0<a href=3D"mailto:pce-chairs@ietf.org" =
target=3D"_blank" style=3D"">pce-chairs@ietf.org</a>. We would<br style=3D"=
">use this information to prepare the WG status report.<br style=3D""><br s=
tyle=3D"">--<br style=3D""><br style=3D"">Thanks!<br style=3D"">PCE WG Secr=
etary &amp; Chairs</font><br></div></div>

--000000000000b0345c058d7e5ae7--


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From: "Mike Koldychev (mkoldych)" <mkoldych@cisco.com>
To: "pce@ietf.org" <pce@ietf.org>
Thread-Topic: Proposal for signaling ECMP or UCMP paths
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Subject: [Pce] Proposal for signaling ECMP or UCMP paths
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Hi WG,

As per SPRING WG, SR Policy may contain multiple Candidate Paths and each C=
andidate Path may contain multiple Segment Lists. Existing SR standards in =
PCEP allow only a single ERO (one Segment List) for the SR Path in a statef=
ul PCEP message. There is a need to signal multiple Segment Lists in PCEP f=
or this as well as other load balancing use cases.=20

See the link that describes this, as well as list possible ways to achieve =
this. Please provide your feedback on the list or during the WG session.

https://github.com/dhruvdhody-huawei/105/blob/master/multiple_ERO_jl03a.pdf

Thanks,
Mike.


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Subject: [Pce] PCE WG Adoption poll for draft-leedhody-pce-vn-association
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Hi WG,

He authors of draft-leedhody-pce-vn-association have been asking for
adoption and...

- the base PCEP association extensions seem to be stable and advancing
- I did an early review and the authors span a new version

So, this starts an adoption poll for the draft. Because IETF-105 is imminent
and you all have lots to do and read, we'll make this a three week poll
ending on 4th August.

Please send your comments of support or antipathy.

In either case, please indicate whether or not you have read the draft, and
if you support it, please say whether or not you propose to and even
possibly implement the draft.

Many thanks,
Adrian (for the chairs)


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From: Jeff Tantsura <jefftant.ietf@gmail.com>
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Date: Sun, 14 Jul 2019 10:41:59 -0700
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To: adrian@olddog.co.uk
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Subject: Re: [Pce] PCE WG Adoption poll for draft-leedhody-pce-vn-association
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Yes/support 

Regards,
Jeff

> On Jul 14, 2019, at 06:00, Adrian Farrel <adrian@olddog.co.uk> wrote:
> 
> draft-leedhody-pce-vn


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From: Young Lee <younglee.tx@gmail.com>
Date: Sun, 14 Jul 2019 21:26:50 -0500
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Subject: Re: [Pce] PCE WG Adoption poll for draft-leedhody-pce-vn-association
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--000000000000cf4253058daefe30
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Yes/Support.

Young (co-author)

On Sun, Jul 14, 2019, 8:00 AM Adrian Farrel <adrian@olddog.co.uk> wrote:

> Hi WG,
>
> He authors of draft-leedhody-pce-vn-association have been asking for
> adoption and...
>
> - the base PCEP association extensions seem to be stable and advancing
> - I did an early review and the authors span a new version
>
> So, this starts an adoption poll for the draft. Because IETF-105 is
> imminent
> and you all have lots to do and read, we'll make this a three week poll
> ending on 4th August.
>
> Please send your comments of support or antipathy.
>
> In either case, please indicate whether or not you have read the draft, and
> if you support it, please say whether or not you propose to and even
> possibly implement the draft.
>
> Many thanks,
> Adrian (for the chairs)
>
>

--000000000000cf4253058daefe30
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto">Yes/Support.<div dir=3D"auto"><br></div><div dir=3D"auto"=
>Young (co-author)</div></div><br><div class=3D"gmail_quote"><div dir=3D"lt=
r" class=3D"gmail_attr">On Sun, Jul 14, 2019, 8:00 AM Adrian Farrel &lt;<a =
href=3D"mailto:adrian@olddog.co.uk">adrian@olddog.co.uk</a>&gt; wrote:<br><=
/div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex">Hi WG,<br>
<br>
He authors of draft-leedhody-pce-vn-association have been asking for<br>
adoption and...<br>
<br>
- the base PCEP association extensions seem to be stable and advancing<br>
- I did an early review and the authors span a new version<br>
<br>
So, this starts an adoption poll for the draft. Because IETF-105 is imminen=
t<br>
and you all have lots to do and read, we&#39;ll make this a three week poll=
<br>
ending on 4th August.<br>
<br>
Please send your comments of support or antipathy.<br>
<br>
In either case, please indicate whether or not you have read the draft, and=
<br>
if you support it, please say whether or not you propose to and even<br>
possibly implement the draft.<br>
<br>
Many thanks,<br>
Adrian (for the chairs)<br>
<br>
</blockquote></div>

--000000000000cf4253058daefe30--


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From nobody Mon Jul 15 01:20:44 2019
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Reply-To: <adrian@olddog.co.uk>
From: "Adrian Farrel" <adrian@olddog.co.uk>
To: <pce@ietf.org>
Date: Mon, 15 Jul 2019 09:20:05 +0100
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Subject: [Pce] Please review draft-farrel-pce-stateful-flags-00.txt
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This is currently a simple draft, and in that form I think it might be
pushed through publication really fast. So now is a good time to review it.

If, on the other hand, someone has  further 8231 clarification they want to
make, now is the time to bring it up.

Best,
Adrian
--
Read some fairy stories for adults of all ages
. Tales from the Wood
. More Tales from the Wood
. Tales from Beyond the Wood
. Tales from the Castle
Get them on line https://www.feedaread.com/profiles/8604/
Or buy a signed copy from me by post
*** Stop me in the corridor at IETF-105 to get a copy ***



-----Original Message-----
From: Pce <pce-bounces@ietf.org> On Behalf Of Adrian Farrel
Sent: 24 June 2019 08:04
To: pce@ietf.org
Subject: [Pce] New draft draft-farrel-pce-stateful-flags-00.txt

Hi,

While reviewing draft-ietf-pce-lsp-control-request I noticed that RFC 8231
is missing clarity about how to handle the Flags field in the SRP object.
RFC 8281 uses one of the Flags, but doesn't add the clarity.

This very short document seeks to add clarity so that future implementations
know how set and process unknown/unassigned bits in the Flags field. It
updates RFC 8231 (if published as an RFC).

Your thoughts would be helpful.

Dhruv suggests there may be other clarifications to 8231 that are needed. If
so, I'd be happy to roll them all together.

Best,
Adrian

-----Original Message-----
From: internet-drafts@ietf.org <internet-drafts@ietf.org> 
Sent: 24 June 2019 07:53
To: Adrian Farrel <adrian@olddog.co.uk>
Subject: New Version Notification for draft-farrel-pce-stateful-flags-00.txt


A new version of I-D, draft-farrel-pce-stateful-flags-00.txt
has been successfully submitted by Adrian Farrel and posted to the
IETF repository.

Name:		draft-farrel-pce-stateful-flags
Revision:	00
Title:		Updated Rules for Processing Stateful PCE Request Parameters
Flags
Document date:	2019-06-24
Group:		Individual Submission
Pages:		5
URL:
https://www.ietf.org/internet-drafts/draft-farrel-pce-stateful-flags-00.txt
Status:
https://datatracker.ietf.org/doc/draft-farrel-pce-stateful-flags/
Htmlized:
https://tools.ietf.org/html/draft-farrel-pce-stateful-flags-00
Htmlized:
https://datatracker.ietf.org/doc/html/draft-farrel-pce-stateful-flags


Abstract:
   Extensions to the Path Computation Element communications Protocol
   (PCEP) to support stateful Path Computation Elements (PCEs) are
   defined in RFC 8231.  One of the extensions is the Stateful PCE
   Request Parameters (SRP) object.  That object includes a Flags field
   that is a set of 32 bit flags, and RFC 8281 defines an IANA registry
   for tracking assigned flags.  However, RFC 8231 does not explain how
   an implementation should set unassigned flags in transmitted
   messages, nor how an implementation should process unassigned,
   unknown, or unsupported flags in received messages.

   This document updates RFC 8231 by defining the correct behaviors.

 



Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat

_______________________________________________
Pce mailing list
Pce@ietf.org
https://www.ietf.org/mailman/listinfo/pce


From nobody Mon Jul 15 02:49:46 2019
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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Mon, 15 Jul 2019 15:19:01 +0530
Message-ID: <CAB75xn4jjFTebe0OMCkEg2NB0RN90=DazrWwN0=HGKwjf+8POw@mail.gmail.com>
To: Farrel Adrian <adrian@olddog.co.uk>, draft-koldychev-pce-operational@ietf.org
Cc: pce@ietf.org
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Subject: Re: [Pce] Please review draft-farrel-pce-stateful-flags-00.txt
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Hi Adrian,

Please see -
https://datatracker.ietf.org/doc/draft-koldychev-pce-operational/

To me the above I-D reads as a clarifications to RFC 8231, but I do
see some possible updates (section 3.3 regarding explicitly making
PCReq optional before PCRpt).

IMHO it would be good to keep the actual updates (to RFC8231) and
clarifications in different document and scope (standards track v/s
informational) if possible.

Thoughts?

Authors, please chime in.
Would be good to discuss this aspect in the WG meeting.

Thanks!
Dhruv


On Mon, Jul 15, 2019 at 1:50 PM Adrian Farrel <adrian@olddog.co.uk> wrote:
>
> This is currently a simple draft, and in that form I think it might be
> pushed through publication really fast. So now is a good time to review it.
>
> If, on the other hand, someone has  further 8231 clarification they want to
> make, now is the time to bring it up.
>
> Best,
> Adrian
> --
> Read some fairy stories for adults of all ages
> .. Tales from the Wood
> .. More Tales from the Wood
> .. Tales from Beyond the Wood
> .. Tales from the Castle
> Get them on line https://www.feedaread.com/profiles/8604/
> Or buy a signed copy from me by post
> *** Stop me in the corridor at IETF-105 to get a copy ***
>
>
>
> -----Original Message-----
> From: Pce <pce-bounces@ietf.org> On Behalf Of Adrian Farrel
> Sent: 24 June 2019 08:04
> To: pce@ietf.org
> Subject: [Pce] New draft draft-farrel-pce-stateful-flags-00.txt
>
> Hi,
>
> While reviewing draft-ietf-pce-lsp-control-request I noticed that RFC 8231
> is missing clarity about how to handle the Flags field in the SRP object.
> RFC 8281 uses one of the Flags, but doesn't add the clarity.
>
> This very short document seeks to add clarity so that future implementations
> know how set and process unknown/unassigned bits in the Flags field. It
> updates RFC 8231 (if published as an RFC).
>
> Your thoughts would be helpful.
>
> Dhruv suggests there may be other clarifications to 8231 that are needed. If
> so, I'd be happy to roll them all together.
>
> Best,
> Adrian
>
> -----Original Message-----
> From: internet-drafts@ietf.org <internet-drafts@ietf.org>
> Sent: 24 June 2019 07:53
> To: Adrian Farrel <adrian@olddog.co.uk>
> Subject: New Version Notification for draft-farrel-pce-stateful-flags-00.txt
>
>
> A new version of I-D, draft-farrel-pce-stateful-flags-00.txt
> has been successfully submitted by Adrian Farrel and posted to the
> IETF repository.
>
> Name:           draft-farrel-pce-stateful-flags
> Revision:       00
> Title:          Updated Rules for Processing Stateful PCE Request Parameters
> Flags
> Document date:  2019-06-24
> Group:          Individual Submission
> Pages:          5
> URL:
> https://www.ietf.org/internet-drafts/draft-farrel-pce-stateful-flags-00.txt
> Status:
> https://datatracker.ietf.org/doc/draft-farrel-pce-stateful-flags/
> Htmlized:
> https://tools.ietf.org/html/draft-farrel-pce-stateful-flags-00
> Htmlized:
> https://datatracker.ietf.org/doc/html/draft-farrel-pce-stateful-flags
>
>
> Abstract:
>    Extensions to the Path Computation Element communications Protocol
>    (PCEP) to support stateful Path Computation Elements (PCEs) are
>    defined in RFC 8231.  One of the extensions is the Stateful PCE
>    Request Parameters (SRP) object.  That object includes a Flags field
>    that is a set of 32 bit flags, and RFC 8281 defines an IANA registry
>    for tracking assigned flags.  However, RFC 8231 does not explain how
>    an implementation should set unassigned flags in transmitted
>    messages, nor how an implementation should process unassigned,
>    unknown, or unsupported flags in received messages.
>
>    This document updates RFC 8231 by defining the correct behaviors.
>
>
>
>
>
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> The IETF Secretariat
>
> _______________________________________________
> Pce mailing list
> Pce@ietf.org
> https://www.ietf.org/mailman/listinfo/pce
>
> _______________________________________________
> Pce mailing list
> Pce@ietf.org
> https://www.ietf.org/mailman/listinfo/pce


From nobody Mon Jul 15 08:21:11 2019
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Hi Authors,

I did a quick review of your I-D. I hope this could help you better
prepare for your presentation slot in the PCE WG.

(1) I checked the I-D in spring [1] as well, but could not find a
figure that could show me how the SR forwarding would look like. I
would suggest you include a figure in your slides that shows label
stacks as the packet moves for -
- same Tree-SID used everywhere
- different Tree-SID at root/branch/leaf
- directly-connected v/s multi-hop v/s explicit-path between
replication points (branch nodes)

(2) Regarding the central control instruction, it would be good to
list, what information (in general terms) needs to be pushed towards -
- Ingress
- Replication Nodes
- Leaves
And hope this links up nicely with (1). You have some data in section
3.1 but it is not clear.

(3) The draft includes various details on -
- MVPN / PIM interactions
- Leaf discovery
- NBI at PCE
All of these should not be any different from P2MP RSVP-TE from the
PCE point of view, and the way you provide these details it feels like
it is some thing new needed to support SR P2MP. I would suggest that
the focus should be only on the *new* procedures and refer to existing
procedures as much as you can.

(4) Other considerations
- IMHO there is possibility to reuse lot more PCEP objects and TLVs
rather than defining them newly, this we can go over later if there is
interest and support from the WG
- IMHO regarding message encoding, you require a way to download
multiple SID-List at the root and branch nodes, to me Stateful P2MP
initiate message which allows Multiple ERO with each ERO having SR-ERO
subobject could achieve it, the things that are missing can be added
on this as a base. But lets focus on this part once we have clarity on
others.
- Global optimization in stateful PCE refers to optimization of
multiple LSPs, I think in section 3.2.2 you mean End-to-end
optimization?
- You need a new CCI object-type of the existing CCI object, rather
than a new PCEP object called SR-P2MP-CCI.

I hope you would focus on (1) and (2) during your presentation;
discussion on the list would be even better.

Thanks,
Dhruv

[1] https://datatracker.ietf.org/doc/draft-voyer-spring-sr-p2mp-policy/


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Subject: [Pce] IPR poll on draft-leedhody-pce-vn-association
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--00000000000075dbf0058db9e3f3
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Hi Authors,

In preparation for Working Group adoption on this draft, I'd like all
authors and contributors to confirm on the list that they are in compliance
with IETF IPR rules.

One IPR has already been disclosed: https://datatracker.ietf.org/ipr/3329/

Please respond (copying the mailing list) to say one of:

I am not aware of any IPR applicable to this draft that should be disclosed
in accordance with IETF IPR rules.

I am aware of IPR applicable to this draft, and it has already been
disclosed to the IETF.

I am aware of IPR applicable to this draft, but that has not yet been
disclosed to the IETF. I will work to ensure that it will be disclosed in a
timely manner.

Thanks,
- Hari

--00000000000075dbf0058db9e3f3
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:verdana,=
sans-serif;font-size:small"><pre class=3D"gmail-m_-7585891155325376502gmail=
-m_5789933747195254190gmail-wordwrap" style=3D"white-space:pre-wrap;box-siz=
ing:border-box;margin-top:0px;margin-bottom:1rem;overflow:auto;color:rgb(33=
,37,41);word-break:normal;padding:0px"><font face=3D"verdana, sans-serif">H=
i Authors,

In preparation for Working Group adoption on this draft, I&#39;d like all
authors and contributors to confirm on the list that they are in compliance
with IETF IPR rules.</font></pre><pre class=3D"gmail-m_-7585891155325376502=
gmail-m_5789933747195254190gmail-wordwrap" style=3D"white-space:pre-wrap;bo=
x-sizing:border-box;margin-top:0px;margin-bottom:1rem;overflow:auto;color:r=
gb(33,37,41);word-break:normal;padding:0px"><font face=3D"verdana, sans-ser=
if">One IPR has already been disclosed: </font><a href=3D"https://datatrack=
er.ietf.org/ipr/3329/" style=3D"font-family:verdana,sans-serif">https://dat=
atracker.ietf.org/ipr/3329/</a></pre><pre class=3D"gmail-m_-758589115532537=
6502gmail-m_5789933747195254190gmail-wordwrap" style=3D"white-space:pre-wra=
p;box-sizing:border-box;margin-top:0px;margin-bottom:1rem;overflow:auto;col=
or:rgb(33,37,41);word-break:normal;padding:0px"><font face=3D"verdana, sans=
-serif">Please respond (copying the mailing list) to say one of:

I am not aware of any IPR applicable to this draft that should be disclosed
in accordance with IETF IPR rules.

I am aware of IPR applicable to this draft, and it has already been
disclosed to the IETF.

I am aware of IPR applicable to this draft, but that has not yet been
disclosed to the IETF. I will work to ensure that it will be disclosed in a
timely manner.

Thanks,
- Hari</font></pre></div></div>

--00000000000075dbf0058db9e3f3--


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Hi Authors,

I did a quick review of your I-D, but some key questions came up, it
would be nice if they could be clarified before hand.

(1) It needs to be made clear that why does backup egress needs to
know about the details of the primary SR path at the primary ingress?
Since things are driven by PCE/controller and there is no signalling,
the motivation needs to be different than RFC 8424 for RSVP-TE.  IMHO
the only reason for backup ingress to be aware of these details would
be to detect the failure of the primary ingress itself. And the
benefit offered by that isn't clear.

(2) Once the motivations are cleared up, then we should explore the
use of existing techniques like PCEP-Flowspec [1] instead of defining
new sub-TLVs for traffic description.  I see you have a few new things
like virtual network but not clear how they would be used and why are
tightly coupled for this use-case.

I hope you would focus on these aspects during your presentation.
Discussion on the list would be even better.

Thanks,
Dhruv

[1] https://tools.ietf.org/html/draft-ietf-pce-pcep-flowspec-03


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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Mon, 15 Jul 2019 20:57:19 +0530
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Subject: [Pce] Quick Review of SR Inter-domain and association
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Hi Authors,

I did a quick review of the I-Ds, but some key questions came up, it
would be nice if they could be clarified before hand.

--

(1) Association:

It is important to describe where this association exist and what role
does that play, to me the importance of the association is at the
Parent PCE only and thus the existing Stateful H-PCE [1] procedures
should be enough IMHO.

See figure 2 in your I-D, ASSOC 1 LSPs are distributed between all the
other child PCEs and thus not at clear why a child PCE need to be
aware of the association when it does not know any other LSP (outside
of its domain, that are part of the same association group).

--

(2) Path Segment:

I saw the spring I-D [2] as well, and was thrown by the use of path
segment as a way to stitch. My gut feeling was isn't that more like a
binding segment? Also for stitching label in PCE, please check
Olivier's I-D [3].

So, some clarity on what exactly you would like to achieve and the
reason behind the use of association and path segment is required.

--

I hope you would focus on these aspects during your presentation.
Discussion on the list would be even better.

Thanks,
Dhruv

[1] https://tools.ietf.org/html/draft-ietf-pce-stateful-hpce-11
[2] https://tools.ietf.org/id/draft-xiong-spring-path-segment-sr-inter-domain-00.txt
[3] https://tools.ietf.org/html/draft-dugeon-pce-stateful-interdomain-02


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From: Tomonori Takeda <tomonori.takeda.fk@hco.ntt.co.jp>
Date: Tue, 16 Jul 2019 10:38:06 +0900
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Subject: [Pce] RtgDir review: draft-ietf-pce-lsp-control-request-06.txt
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Hello,

I have been selected as the Routing Directorate reviewer for this draft. The Routing Directorate seeks to review all routing or
routing-related drafts as they pass through IETF last call and IESG review, and sometimes on special request. The purpose of the
review is to provide assistance to the Routing ADs. For more information about the Routing Directorate, please see
http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir

Although these comments are primarily for the use of the Routing ADs, it would be helpful if you could consider them along with any
other IETF Last Call comments that you receive, and strive to resolve them through discussion or by updating the draft.

  Document: draft-ietf-pce-lsp-control-request-06.txt
  Reviewer: Tomonori Takeda
  Review Date: July 16th, 2019
  IETF LC End Date: Not known
  Intended Status: Standards Track

Summary: 
This document is basically ready for publication, but has nits that should be considered prior to publication.

Comments:
This document specifies a PCEP extension by which a PCE can request control of LSP(s) from PCC(s) over the stateful PCEP sessions.
The procotol extension is simple, and its operation is well documented, including operation with PCCs that do not support the
protocol extension specified in this document.

Major Issues:
None

Minor Issues:
None

Nits:
1) In Section 2, it states terminologies. Since these terminologies are already defined in other documents, I would suggest to add
references.

2) In Section 8.1, it says:
"Further, the operator MAY be to be allowed "

It should be:
"Further, the operator MAY be allowed "


Thanks,
Tomonori Takeda


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From nobody Wed Jul 17 02:11:08 2019
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Subject: [Pce] The PCE WG has placed draft-leedhody-pce-vn-association in state "Call For Adoption By WG Issued"
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The PCE WG has placed draft-leedhody-pce-vn-association in state
Call For Adoption By WG Issued (entered by Dhruv Dhody)

The document is available at
https://datatracker.ietf.org/doc/draft-leedhody-pce-vn-association/


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From: Satish K <satish.ietf@gmail.com>
Date: Wed, 17 Jul 2019 16:42:03 +0530
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Subject: Re: [Pce] PCE WG Adoption poll for draft-leedhody-pce-vn-association
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Yes/Support.

Regards,
Satish.

On Sun, Jul 14, 2019 at 6:30 PM Adrian Farrel <adrian@olddog.co.uk> wrote:

> Hi WG,
>
> He authors of draft-leedhody-pce-vn-association have been asking for
> adoption and...
>
> - the base PCEP association extensions seem to be stable and advancing
> - I did an early review and the authors span a new version
>
> So, this starts an adoption poll for the draft. Because IETF-105 is
> imminent
> and you all have lots to do and read, we'll make this a three week poll
> ending on 4th August.
>
> Please send your comments of support or antipathy.
>
> In either case, please indicate whether or not you have read the draft, and
> if you support it, please say whether or not you propose to and even
> possibly implement the draft.
>
> Many thanks,
> Adrian (for the chairs)
>
> _______________________________________________
> Pce mailing list
> Pce@ietf.org
> https://www.ietf.org/mailman/listinfo/pce
>

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<div dir=3D"ltr"><div>Yes/Support.</div><div><br></div><div>Regards,</div><=
div>Satish.<br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Sun, Jul 14, 2019 at 6:30 PM Adrian Farrel &lt;<a h=
ref=3D"mailto:adrian@olddog.co.uk">adrian@olddog.co.uk</a>&gt; wrote:<br></=
div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bor=
der-left:1px solid rgb(204,204,204);padding-left:1ex">Hi WG,<br>
<br>
He authors of draft-leedhody-pce-vn-association have been asking for<br>
adoption and...<br>
<br>
- the base PCEP association extensions seem to be stable and advancing<br>
- I did an early review and the authors span a new version<br>
<br>
So, this starts an adoption poll for the draft. Because IETF-105 is imminen=
t<br>
and you all have lots to do and read, we&#39;ll make this a three week poll=
<br>
ending on 4th August.<br>
<br>
Please send your comments of support or antipathy.<br>
<br>
In either case, please indicate whether or not you have read the draft, and=
<br>
if you support it, please say whether or not you propose to and even<br>
possibly implement the draft.<br>
<br>
Many thanks,<br>
Adrian (for the chairs)<br>
<br>
_______________________________________________<br>
Pce mailing list<br>
<a href=3D"mailto:Pce@ietf.org" target=3D"_blank">Pce@ietf.org</a><br>
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From: Cyril Margaria <cyril.margaria@gmail.com>
Date: Fri, 19 Jul 2019 14:36:59 +0100
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To: "Mike Koldychev (mkoldych)" <mkoldych@cisco.com>
Cc: "pce@ietf.org" <pce@ietf.org>
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Subject: Re: [Pce] Proposal for signaling ECMP or UCMP paths
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Hi,

On slide "LSP objectives and constraints": Stateless  PCE can compute set
of EROs/Label switch paths using RFC6007, including multi-domain and
multi-PCEs scenarios. This can be used for computing a set of EROs for SR
candidate paths, one case that can apply to the candidate path and
explicitly mentioned by the RFC is "Two or more end-to-end diverse paths".
This does not cover the stateful PCE case directly, but there are similar
situations to what RFC6007 in the form of path protection
(primary/secondary/standby) for statefull PCE, which use the association
mechanism. Those two existing mechanism exists to coordinate several paths
and could be used to indicate how multiple paths are related and on how to
signal them together (SVEC)

On slide "Analysis of Solution 1":
  - For PCC-Initated LSPs: what prevents the PCE to to create PCE-Initiated
LSPs using the same association id? This would tackle the problem.
  - The possibility of each path to have different objective does seems to
be an advantage as its less restrictive. Having the same restriction on a
set of paths is easy, relaxing a restriction on the ERO #5 is more
complicated (in term of encoding).
  - There is a set of options to achieve the "signal the set of paths
together":
     a)  set of LSPs can be reported in the same message, it can be
enforced by the document defining that specific association type.
     b) SVEC/SVEC List can be extended to statefull PCEP,

That solution would work in case of multi-domain PCEs, and also be helpful
for OAM and auto-bw mechanism.
As a segment list is one path in the network, that maps nicely to one LSP.


Solution 2:
  - This limit the set of constraints to be applied, policies like "10% of
the traffic does not need to be protected" cannot be expressed (it can be
with solution 1, clear L bit of LSPA on one TE-LSP out of 10)
  - 2.a when the LSP is reported down : which ERO is down?, the same is
applicable for auto-bw and any form of OAM data.
  - Solution 2.b allows for Optimized branch encoding, that should be
disabled for that solution


Slide "Comparison of Solutions":
   - There are solutions to most of the points raised for solution 1
   - The database problem seems specific to one implementation, other
implementation will have the problem for solution 2
   -  multi-PCE and multi-domain are not evaluated. Solutions and
consideration are available for solution 1, not for solution 2.
(experimental Inter-domain P2MP tree solutions exists).

Best Regards,
Cyril

On Fri, 12 Jul 2019 at 22:02, Mike Koldychev (mkoldych) <mkoldych@cisco.com>
wrote:

> Hi WG,
>
> As per SPRING WG, SR Policy may contain multiple Candidate Paths and each
> Candidate Path may contain multiple Segment Lists. Existing SR standards in
> PCEP allow only a single ERO (one Segment List) for the SR Path in a
> stateful PCEP message. There is a need to signal multiple Segment Lists in
> PCEP for this as well as other load balancing use cases.
>
> See the link that describes this, as well as list possible ways to achieve
> this. Please provide your feedback on the list or during the WG session.
>
> https://github.com/dhruvdhody-huawei/105/blob/master/multiple_ERO_jl03a.pdf
>
> Thanks,
> Mike.
>
> _______________________________________________
> Pce mailing list
> Pce@ietf.org
> https://www.ietf.org/mailman/listinfo/pce
>

--000000000000e0d5aa058e08d2f6
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi,=C2=A0<div><br></div><div>On slide &quot;LSP objectives=
 and constraints&quot;: Stateless=C2=A0 PCE can compute set of EROs/Label s=
witch paths using RFC6007, including multi-domain and multi-PCEs scenarios.=
 This can be used for computing a set of EROs for SR candidate paths, one c=
ase that can apply to the candidate path and explicitly mentioned by the RF=
C is &quot;<span style=3D"color:rgb(0,0,0);font-size:13.3333px">Two or more=
 end-to-end diverse paths&quot;.=C2=A0 This does not cover the stateful PCE=
 case directly, but there are similar situations to what RFC6007 in the for=
m of path protection (primary/secondary/standby) for statefull PCE, which u=
se the association mechanism. Those two existing mechanism exists to coordi=
nate several paths and could be used to indicate how multiple paths are rel=
ated and on how to signal them together (SVEC)=C2=A0</span><br></div><div><=
span style=3D"color:rgb(0,0,0);font-size:13.3333px"><br></span></div><div><=
span style=3D"color:rgb(0,0,0);font-size:13.3333px">On slide &quot;Analysis=
 of Solution 1&quot;:<br>=C2=A0 - For PCC-Initated LSPs: what prevents the =
PCE to to create PCE-Initiated LSPs using the same association id? This wou=
ld tackle the problem.</span></div><div><span style=3D"color:rgb(0,0,0);fon=
t-size:13.3333px">=C2=A0 - The possibility of each path to have different o=
bjective does seems to be an advantage as its less restrictive. Having the =
same restriction on a set of paths is easy, relaxing a restriction on the E=
RO #5 is more complicated (in term of encoding).=C2=A0<br>=C2=A0 - There is=
 a set of options to achieve the &quot;signal the set of paths together&quo=
t;:<br>=C2=A0 =C2=A0 =C2=A0a)=C2=A0 set of LSPs can be reported in the same=
 message, it can be enforced by the document defining that specific associa=
tion type.=C2=A0</span></div><div><span style=3D"color:rgb(0,0,0);font-size=
:13.3333px">=C2=A0 =C2=A0 =C2=A0b) SVEC/SVEC List can be extended to statef=
ull PCEP,=C2=A0</span></div><div><font color=3D"#000000"><span style=3D"fon=
t-size:13.3333px"><br>That solution would work in case of multi-domain PCEs=
, and also be helpful for OAM and auto-bw mechanism.=C2=A0</span></font></d=
iv><div><font color=3D"#000000"><span style=3D"font-size:13.3333px">As a se=
gment list is one path in the network, that maps nicely to one LSP.</span><=
/font></div><div><font color=3D"#000000"><span style=3D"font-size:13.3333px=
">=C2=A0</span></font></div><div><font color=3D"#000000"><span style=3D"fon=
t-size:13.3333px"><br></span></font></div><div><font color=3D"#000000"><spa=
n style=3D"font-size:13.3333px">Solution 2:=C2=A0=C2=A0</span></font></div>=
<div><font color=3D"#000000"><span style=3D"font-size:13.3333px">=C2=A0 - T=
his limit the set of constraints to be applied, policies like &quot;10% of =
the traffic does not need to be protected&quot; cannot be expressed (it can=
 be with solution 1, clear L bit of LSPA on one TE-LSP out of 10)=C2=A0</sp=
an></font></div><div><font color=3D"#000000"><span style=3D"font-size:13.33=
33px">=C2=A0 - 2.a when the LSP is reported down : which ERO is down?, the =
same is applicable for auto-bw and any form of OAM data.=C2=A0</span></font=
></div><div><font color=3D"#000000"><span style=3D"font-size:13.3333px">=C2=
=A0 - Solution 2.b allows for Optimized branch encoding, that should be dis=
abled for that solution=C2=A0</span></font></div><div><span style=3D"color:=
rgb(0,0,0);font-size:13.3333px"><br></span></div><div><span style=3D"color:=
rgb(0,0,0);font-size:13.3333px"><br></span></div><div><span style=3D"color:=
rgb(0,0,0);font-size:13.3333px">Slide &quot;Comparison of Solutions&quot;:<=
/span></div><div><span style=3D"color:rgb(0,0,0);font-size:13.3333px">=C2=
=A0 =C2=A0- There are solutions to most of the points raised for solution 1=
</span></div><div><span style=3D"color:rgb(0,0,0);font-size:13.3333px">=C2=
=A0 =C2=A0- The database problem seems specific to one implementation, othe=
r implementation will have the problem for solution 2=C2=A0</span></div><di=
v><span style=3D"color:rgb(0,0,0);font-size:13.3333px">=C2=A0 =C2=A0-=C2=A0=
 multi-PCE and multi-domain are not evaluated. Solutions and consideration =
are available for solution 1, not for solution 2. (experimental Inter-domai=
n P2MP tree solutions exists).</span></div><div><span style=3D"color:rgb(0,=
0,0);font-size:13.3333px">=C2=A0</span></div><div><span style=3D"color:rgb(=
0,0,0);font-size:13.3333px">Best Regards,=C2=A0</span></div><div><span styl=
e=3D"color:rgb(0,0,0);font-size:13.3333px">Cyril</span></div></div><br><div=
 class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, 12 Jul=
 2019 at 22:02, Mike Koldychev (mkoldych) &lt;<a href=3D"mailto:mkoldych@ci=
sco.com" target=3D"_blank">mkoldych@cisco.com</a>&gt; wrote:<br></div><bloc=
kquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:=
1px solid rgb(204,204,204);padding-left:1ex">Hi WG,<br>
<br>
As per SPRING WG, SR Policy may contain multiple Candidate Paths and each C=
andidate Path may contain multiple Segment Lists. Existing SR standards in =
PCEP allow only a single ERO (one Segment List) for the SR Path in a statef=
ul PCEP message. There is a need to signal multiple Segment Lists in PCEP f=
or this as well as other load balancing use cases. <br>
<br>
See the link that describes this, as well as list possible ways to achieve =
this. Please provide your feedback on the list or during the WG session.<br=
>
<br>
<a href=3D"https://github.com/dhruvdhody-huawei/105/blob/master/multiple_ER=
O_jl03a.pdf" rel=3D"noreferrer" target=3D"_blank">https://github.com/dhruvd=
hody-huawei/105/blob/master/multiple_ERO_jl03a.pdf</a><br>
<br>
Thanks,<br>
Mike.<br>
<br>
_______________________________________________<br>
Pce mailing list<br>
<a href=3D"mailto:Pce@ietf.org" target=3D"_blank">Pce@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/pce" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/pce</a><br>
</blockquote></div>

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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Fri, 19 Jul 2019 10:18:04 -0400
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To: xiong.quan@zte.com.cn
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Subject: Re: [Pce] Quick Review of SR Inter-domain and association
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Hi Quan,

First of all thanks for your reply to the list...

On Wed, Jul 17, 2019 at 8:43 AM <xiong.quan@zte.com.cn> wrote:

>
> Hi Dhruv,
>
>
> Thanks for your review and suggestions! It is very appreciated!
>
> My clarification is as follows tagged with Quan>>.
>
>
> Best Regards,
>
> Quan
>
>
> <<Hi Authors,
>
> <<I did a quick review of the I-Ds, but some key questions came up, it
> <<would be nice if they could be clarified before hand.
>
> --
>
> (1) Association:
>
> It is important to describe where this association exist and what role
> does that play, to me the importance of the association is at the
> Parent PCE only and thus the existing Stateful H-PCE [1] procedures
>
> should be enough IMHO.
> See figure 2 in your I-D, ASSOC 1 LSPs are distributed between all the
> other child PCEs and thus not at clear why a child PCE need to be
> aware of the association when it does not know any other LSP (outside
>
> of its domain, that are part of the same association group).
>
>
> Quan>>I agree with you and thanks for your suggestion. The Stitching LSP
>
> association is created and maintained at parent PCE. The Stitching LSP
>
> association is used in inter-Area scenario. The association is useful
> when the
>
>  LSPs from multiple domains are aready created and the parent PCE may
>
>  associate them into a group and achieve the end-to-end LSP. I will
> update
>
> and clarify the use case and the detailed operation  as following shown.
>
>
>
>
Dhruv: The key question is why does the child PCE (PCE-1,2,3) needs to be
aware of this association once it is created at the parent PCE? In other
words what do you expect the child PCE to do when it receives a PCUpd
message with the association information? Answering this question would
help to clarify the need.

>
> (2) Path Segment:
>
> I saw the spring I-D [2] as well, and was thrown by the use of path
> segment as a way to stitch. My gut feeling was isn't that more like a
> binding segment? Also for stitching label in PCE, please check
> Olivier's I-D [3].
> So, some clarity on what exactly you would like to achieve and the
> reason behind the use of association and path segment is required.
>
> Quan>>I have compared my draft with [3] before. I think my draft focus on
>
> the SR inter-domain scenario and provide end-to-end solution with path
>
> segment. The path segment is the path identifier and it can be used to
>
> correlate SR paths. When the path segment is used to correlate two
>
> inter-domain LSPs, it is used as a stitching label and the path segment
>
> in SR networks can be viewed as an instantiation or specific application
>
> for the stitching label which proposed in draft[3]. The path segment used
>
> as a stitching label in inter-AS scenario as following shown.
>
>
>
Dhruv: I understand what you want to achieve, but I am not able to grasp
why use Path segment for it. Anyways the use of path segment in this way
should get consensuses in SPRING WG first.

Safe Travels!

Thanks!
Dhruv


>
> I hope you would focus on these aspects during your presentation.
> Discussion on the list would be even better.
>
> Thanks,
> Dhruv
>
> [1] https://tools.ietf.org/html/draft-ietf-pce-stateful-hpce-11
> [2]
> https://tools.ietf.org/id/draft-xiong-spring-path-segment-sr-inter-domain-00.txt
> [3] https://tools.ietf.org/html/draft-dugeon-pce-stateful-interdomain-02
>
>
>

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<div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fon=
t-family:monospace,monospace"><span style=3D"font-family:Osaka-=E7=AD=89=E5=
=B9=85,Osaka-Mono,&quot;\00ff2d\00ff33  \0030b4\0030b7\0030c3\0030af&quot;,=
&quot;MS Gothic&quot;,monospace">Hi Quan,=C2=A0</span><div style=3D"font-fa=
mily:Osaka-=E7=AD=89=E5=B9=85,Osaka-Mono,&quot;\00ff2d\00ff33  \0030b4\0030=
b7\0030c3\0030af&quot;,&quot;MS Gothic&quot;,monospace"><br></div><div styl=
e=3D"font-family:Osaka-=E7=AD=89=E5=B9=85,Osaka-Mono,&quot;\00ff2d\00ff33  =
\0030b4\0030b7\0030c3\0030af&quot;,&quot;MS Gothic&quot;,monospace">First o=
f all thanks for your reply to the list...=C2=A0</div></div></div><br><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Jul 17,=
 2019 at 8:43 AM &lt;<a href=3D"mailto:xiong.quan@zte.com.cn" target=3D"_bl=
ank">xiong.quan@zte.com.cn</a>&gt; wrote:<br></div><blockquote class=3D"gma=
il_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,2=
04,204);padding-left:1ex"><div class=3D"m_-7578370232704697994gmail-m_16468=
61068643974395zcontentRow"><p style=3D"font-size:14px;font-family:arial"><b=
r></p><p style=3D"font-size:14px;font-family:arial">Hi Dhruv,</p><p style=
=3D"font-size:14px;font-family:arial"><br></p><p style=3D"font-size:14px;fo=
nt-family:arial">Thanks for your review and suggestions! It is very appreci=
ated!</p><p style=3D"font-size:14px;font-family:arial">My=C2=A0<span style=
=3D"line-height:21px">clarification is as follows tagged with Quan&gt;&gt;.=
</span></p><p style=3D"font-size:14px;font-family:arial"><span style=3D"lin=
e-height:21px"><br></span></p><p style=3D"font-size:14px;font-family:arial"=
><span style=3D"line-height:21px">Best Regards,</span></p><p style=3D"font-=
size:14px;font-family:arial"><span style=3D"line-height:21px">Quan</span></=
p><div><div class=3D"m_-7578370232704697994gmail-m_1646861068643974395zhist=
oryRow" style=3D"display:block"><br><div id=3D"m_-7578370232704697994gmail-=
m_1646861068643974395zwriteHistoryContainer"><div class=3D"m_-7578370232704=
697994gmail-m_1646861068643974395control-group m_-7578370232704697994gmail-=
m_1646861068643974395zhistoryPanel"><div class=3D"m_-7578370232704697994gma=
il-m_1646861068643974395zhistoryContent"><p><br></p><p>&lt;&lt;Hi=C2=A0Auth=
ors,</p><br>&lt;&lt;I=C2=A0did=C2=A0a=C2=A0quick=C2=A0review=C2=A0of=C2=A0t=
he=C2=A0I-Ds,=C2=A0but=C2=A0some=C2=A0key=C2=A0questions=C2=A0came=C2=A0up,=
=C2=A0it<br>&lt;&lt;would=C2=A0be=C2=A0nice=C2=A0if=C2=A0they=C2=A0could=C2=
=A0be=C2=A0clarified=C2=A0before=C2=A0hand.<br><br>--<br><br>(1)=C2=A0Assoc=
iation:<br><br>It=C2=A0is=C2=A0important=C2=A0to=C2=A0describe=C2=A0where=
=C2=A0this=C2=A0association=C2=A0exist=C2=A0and=C2=A0what=C2=A0role<br>does=
=C2=A0that=C2=A0play,=C2=A0to=C2=A0me=C2=A0the=C2=A0importance=C2=A0of=C2=
=A0the=C2=A0association=C2=A0is=C2=A0at=C2=A0the<br>Parent=C2=A0PCE=C2=A0on=
ly=C2=A0and=C2=A0thus=C2=A0the=C2=A0existing=C2=A0Stateful=C2=A0H-PCE=C2=A0=
[1]=C2=A0procedures<br><p>should=C2=A0be=C2=A0enough=C2=A0IMHO.</p>See=C2=
=A0figure=C2=A02=C2=A0in=C2=A0your=C2=A0I-D,=C2=A0ASSOC=C2=A01=C2=A0LSPs=C2=
=A0are=C2=A0distributed=C2=A0between=C2=A0all=C2=A0the<br>other=C2=A0child=
=C2=A0PCEs=C2=A0and=C2=A0thus=C2=A0not=C2=A0at=C2=A0clear=C2=A0why=C2=A0a=
=C2=A0child=C2=A0PCE=C2=A0need=C2=A0to=C2=A0be<br>aware=C2=A0of=C2=A0the=C2=
=A0association=C2=A0when=C2=A0it=C2=A0does=C2=A0not=C2=A0know=C2=A0any=C2=
=A0other=C2=A0LSP=C2=A0(outside<br><p>of=C2=A0its=C2=A0domain,=C2=A0that=C2=
=A0are=C2=A0part=C2=A0of=C2=A0the=C2=A0same=C2=A0association=C2=A0group).</=
p><p><br></p><p>Quan&gt;&gt;I agree with you and thanks for your suggestion=
. The Stitching LSP=C2=A0</p><p><span style=3D"line-height:21px">associatio=
n is created and maintained at parent PCE.=C2=A0</span><span style=3D"line-=
height:21px">The Stitching LSP=C2=A0</span></p><p><span style=3D"line-heigh=
t:21px">association is used in inter-Area scenario.=C2=A0</span><span style=
=3D"line-height:21px">The=C2=A0</span><span style=3D"line-height:21px">asso=
ciation is useful when the</span></p><p><span style=3D"line-height:21px">=
=C2=A0LSPs from multiple domains are=C2=A0</span><span style=3D"line-height=
:21px"><span style=3D"line-height:21px">aready created and the=C2=A0<span s=
tyle=3D"line-height:21px">parent PCE may</span></span></span></p><p><span s=
tyle=3D"line-height:21px"><span style=3D"line-height:21px"><span style=3D"l=
ine-height:21px">=C2=A0<span style=3D"line-height:21px">associate them into=
 a group and=C2=A0</span></span></span></span><span style=3D"line-height:21=
px"><span style=3D"line-height:21px">achieve=C2=A0</span>the end-to-end LSP=
. I will update=C2=A0</span></p><p><span style=3D"line-height:21px">and cla=
rify=C2=A0</span><span style=3D"line-height:21px">the use case and the deta=
iled operation =C2=A0as following shown.</span></p><p><br></p><p><img src=
=3D"cid:16bffaab720d839b4581"></p><p><br></p></div></div></div></div></div>=
</div></blockquote><div><br></div><div><div class=3D"gmail_default" style=
=3D"font-family:monospace,monospace">Dhruv: The key question is why does th=
e child PCE (PCE-1,2,3) needs to be aware of this association once it is cr=
eated at the parent PCE? In other words what do you expect the child PCE to=
 do when it receives a PCUpd message with the association information? Answ=
ering this question would help to clarify the need. </div></div><div class=
=3D"gmail_default" style=3D"font-family:monospace,monospace"></div><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px=
 solid rgb(204,204,204);padding-left:1ex"><div class=3D"m_-7578370232704697=
994gmail-m_1646861068643974395zcontentRow"><div><div class=3D"m_-7578370232=
704697994gmail-m_1646861068643974395zhistoryRow" style=3D"display:block"><d=
iv id=3D"m_-7578370232704697994gmail-m_1646861068643974395zwriteHistoryCont=
ainer"><div class=3D"m_-7578370232704697994gmail-m_1646861068643974395contr=
ol-group m_-7578370232704697994gmail-m_1646861068643974395zhistoryPanel"><d=
iv class=3D"m_-7578370232704697994gmail-m_1646861068643974395zhistoryConten=
t"><p></p><br>(2)=C2=A0Path=C2=A0Segment:<br><br>I=C2=A0saw=C2=A0the=C2=A0s=
pring=C2=A0I-D=C2=A0[2]=C2=A0as=C2=A0well,=C2=A0and=C2=A0was=C2=A0thrown=C2=
=A0by=C2=A0the=C2=A0use=C2=A0of=C2=A0path<br>segment=C2=A0as=C2=A0a=C2=A0wa=
y=C2=A0to=C2=A0stitch.=C2=A0My=C2=A0gut=C2=A0feeling=C2=A0was=C2=A0isn&#39;=
t=C2=A0that=C2=A0more=C2=A0like=C2=A0a<br>binding=C2=A0segment?=C2=A0Also=
=C2=A0for=C2=A0stitching=C2=A0label=C2=A0in=C2=A0PCE,=C2=A0please=C2=A0chec=
k<br>Olivier&#39;s=C2=A0I-D=C2=A0[3].<br>So,=C2=A0some=C2=A0clarity=C2=A0on=
=C2=A0what=C2=A0exactly=C2=A0you=C2=A0would=C2=A0like=C2=A0to=C2=A0achieve=
=C2=A0and=C2=A0the<br>reason=C2=A0behind=C2=A0the=C2=A0use=C2=A0of=C2=A0ass=
ociation=C2=A0and=C2=A0path=C2=A0segment=C2=A0is=C2=A0required.<br><br><p>Q=
uan&gt;&gt;I have compared my draft with [3] before. I think my draft focus=
 on=C2=A0</p><p>the SR inter-domain scenario and provide end-to-end solutio=
n with path=C2=A0</p><p>segment. The path segment is the path identifier an=
d it can be used to=C2=A0</p><p>correlate SR paths. When the path segment i=
s used to=C2=A0<span style=3D"line-height:21px">correlate two=C2=A0</span><=
/p><p><span style=3D"line-height:21px">inter-domain LSPs, it is=C2=A0</span=
><span style=3D"line-height:21px">used as a stitching label and the=C2=A0</=
span><span style=3D"line-height:21px">path segment=C2=A0</span></p><p><span=
 style=3D"line-height:21px">in SR networks can be viewed as an=C2=A0instant=
iation or=C2=A0</span><span style=3D"line-height:21px">specific=C2=A0applic=
ation</span><span style=3D"line-height:21px">=C2=A0</span></p><p><span styl=
e=3D"line-height:21px">for the</span><span style=3D"line-height:21px">=C2=
=A0</span><span style=3D"line-height:21px">stitching label which proposed i=
n draft[3]. The path segment used=C2=A0</span></p><p><span style=3D"line-he=
ight:21px">as a stitching label in inter-AS=C2=A0<span style=3D"line-height=
:21px">scenario as following shown.</span></span></p><p><span style=3D"line=
-height:21px"><span style=3D"line-height:21px"><img src=3D"cid:16bffaab720d=
839b4582"></span></span></p><p><br></p></div></div></div></div></div></div>=
</blockquote><div><br></div><div><div class=3D"gmail_default" style=3D"font=
-family:monospace,monospace">Dhruv: I understand what you want to achieve, =
but I am not able to grasp why use Path segment for it. Anyways the use of =
path segment in this way should get consensuses in SPRING WG first.=C2=A0</=
div><div class=3D"gmail_default" style=3D"font-family:monospace,monospace">=
<br></div><div class=3D"gmail_default" style=3D"font-family:monospace,monos=
pace">Safe Travels!=C2=A0</div><div class=3D"gmail_default" style=3D"font-f=
amily:monospace,monospace"><br></div><div class=3D"gmail_default" style=3D"=
font-family:monospace,monospace">Thanks!=C2=A0</div><div class=3D"gmail_def=
ault" style=3D"font-family:monospace,monospace">Dhruv=C2=A0</div></div><div=
>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class=
=3D"m_-7578370232704697994gmail-m_1646861068643974395zcontentRow"><div><div=
 class=3D"m_-7578370232704697994gmail-m_1646861068643974395zhistoryRow" sty=
le=3D"display:block"><div id=3D"m_-7578370232704697994gmail-m_1646861068643=
974395zwriteHistoryContainer"><div class=3D"m_-7578370232704697994gmail-m_1=
646861068643974395control-group m_-7578370232704697994gmail-m_1646861068643=
974395zhistoryPanel"><div class=3D"m_-7578370232704697994gmail-m_1646861068=
643974395zhistoryContent"><p></p><br>I=C2=A0hope=C2=A0you=C2=A0would=C2=A0f=
ocus=C2=A0on=C2=A0these=C2=A0aspects=C2=A0during=C2=A0your=C2=A0presentatio=
n.<br>Discussion=C2=A0on=C2=A0the=C2=A0list=C2=A0would=C2=A0be=C2=A0even=C2=
=A0better.<br><br>Thanks,<br>Dhruv<br><br>[1]=C2=A0<a href=3D"https://tools=
.ietf.org/html/draft-ietf-pce-stateful-hpce-11" target=3D"_blank">https://t=
ools.ietf.org/html/draft-ietf-pce-stateful-hpce-11</a><br>[2]=C2=A0<a href=
=3D"https://tools.ietf.org/id/draft-xiong-spring-path-segment-sr-inter-doma=
in-00.txt" target=3D"_blank">https://tools.ietf.org/id/draft-xiong-spring-p=
ath-segment-sr-inter-domain-00.txt</a><br>[3]=C2=A0<a href=3D"https://tools=
.ietf.org/html/draft-dugeon-pce-stateful-interdomain-02" target=3D"_blank">=
https://tools.ietf.org/html/draft-dugeon-pce-stateful-interdomain-02</a></d=
iv></div></div></div></div><p><br></p></div></blockquote></div></div>

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From: "Mike Koldychev (mkoldych)" <mkoldych@cisco.com>
To: Cyril Margaria <cyril.margaria@gmail.com>
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Thread-Topic: [Pce] Proposal for signaling ECMP or UCMP paths
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Subject: Re: [Pce] Proposal for signaling ECMP or UCMP paths
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From: Cyril Margaria <cyril.margaria@gmail.com>
Date: Fri, 19 Jul 2019 17:23:16 +0100
Message-ID: <CADOd8-sLi-CzGEd-bDQKzgp=VyOmCRQ42xFhvAvp9EwEF_iRbw@mail.gmail.com>
To: "Mike Koldychev (mkoldych)" <mkoldych@cisco.com>
Cc: "pce@ietf.org" <pce@ietf.org>
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Subject: Re: [Pce] Proposal for signaling ECMP or UCMP paths
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Hi Mike,

One of my point is that one optimization is a peculiar case of n
optimization. For the particuliar case of candidate path, it can be
attached to a given association, each TE-LSP can have the same optimization
criterias.

I understand the argument for Option 2 as "I want to carry and manage my
constraint  (and candidate path) as one PCEP entity", the drawback is that
it will become complicated in case of inter-domain and OAM which are per
path.
The case for option 1 is one path, one LSP, but as you pointed out it
becomes complicated when there is one candidate path that desire a behavior
similar to  LOAD-BALANCING where the PCC ask the PCE to decide how many
path are needed.

I think that option 1 is better in term of protocol reuse and will offer
more flexibility, but that depends on how to deal with the PCE-managed
number of paths.

I will not attend the IETF meeting,

Best regards,
Cyril



On Fri, 19 Jul 2019 at 16:51, Mike Koldychev (mkoldych) <mkoldych@cisco.com=
>
wrote:

> Hi Cyril,
>
>
>
> Thanks a lot for your feedback!
>
>
>
> Maybe I need to make it clear that the problem we=E2=80=99re trying to so=
lve is a
> single optimization objective resulting in multiple ECMP/UCMP paths. This
> is motivated by SR-TE Policy use case, where each Candidate Path represen=
ts
> a single optimization objective. The Candidate Path has a set of Segment
> Lists that satisfy the optimization objective.
>
>
>
> You seem to want to solve a different problem: two or more different
> optimization objectives and each ECMP path is mapped to a different
> objective. In that case Solution 1 is absolutely necessary and it would n=
ot
> have any of the down-sides, because the PCC knows in advance how many
> optimization objectives it has and can create that many PCEP LSPs. Howeve=
r
> for our problem, Solution 1 would introduce a lot of implementation
> complexity and protocol overhead.
>
>
>
> We have a side-meeting scheduled on Wednesday at 8:30 to discuss this
> topic, you are welcome to attend if you want to contribute your input.
>
>
>
> Thanks,
>
> Mike.
>
>
>
> *From:* Cyril Margaria <cyril.margaria@gmail.com>
> *Sent:* Friday, July 19, 2019 9:37 AM
> *To:* Mike Koldychev (mkoldych) <mkoldych@cisco.com>
> *Cc:* pce@ietf.org
> *Subject:* Re: [Pce] Proposal for signaling ECMP or UCMP paths
>
>
>
> Hi,
>
>
>
> On slide "LSP objectives and constraints": Stateless  PCE can compute set
> of EROs/Label switch paths using RFC6007, including multi-domain and
> multi-PCEs scenarios. This can be used for computing a set of EROs for SR
> candidate paths, one case that can apply to the candidate path and
> explicitly mentioned by the RFC is "Two or more end-to-end diverse
> paths".  This does not cover the stateful PCE case directly, but there ar=
e
> similar situations to what RFC6007 in the form of path protection
> (primary/secondary/standby) for statefull PCE, which use the association
> mechanism. Those two existing mechanism exists to coordinate several path=
s
> and could be used to indicate how multiple paths are related and on how t=
o
> signal them together (SVEC)
>
>
>
> On slide "Analysis of Solution 1":
>   - For PCC-Initated LSPs: what prevents the PCE to to create
> PCE-Initiated LSPs using the same association id? This would tackle the
> problem.
>
>   - The possibility of each path to have different objective does seems t=
o
> be an advantage as its less restrictive. Having the same restriction on a
> set of paths is easy, relaxing a restriction on the ERO #5 is more
> complicated (in term of encoding).
>   - There is a set of options to achieve the "signal the set of paths
> together":
>      a)  set of LSPs can be reported in the same message, it can be
> enforced by the document defining that specific association type.
>
>      b) SVEC/SVEC List can be extended to statefull PCEP,
>
>
> That solution would work in case of multi-domain PCEs, and also be helpfu=
l
> for OAM and auto-bw mechanism.
>
> As a segment list is one path in the network, that maps nicely to one LSP=
.
>
>
>
>
>
> Solution 2:
>
>   - This limit the set of constraints to be applied, policies like "10% o=
f
> the traffic does not need to be protected" cannot be expressed (it can be
> with solution 1, clear L bit of LSPA on one TE-LSP out of 10)
>
>   - 2.a when the LSP is reported down : which ERO is down?, the same is
> applicable for auto-bw and any form of OAM data.
>
>   - Solution 2.b allows for Optimized branch encoding, that should be
> disabled for that solution
>
>
>
>
>
> Slide "Comparison of Solutions":
>
>    - There are solutions to most of the points raised for solution 1
>
>    - The database problem seems specific to one implementation, other
> implementation will have the problem for solution 2
>
>    -  multi-PCE and multi-domain are not evaluated. Solutions and
> consideration are available for solution 1, not for solution 2.
> (experimental Inter-domain P2MP tree solutions exists).
>
>
>
> Best Regards,
>
> Cyril
>
>
>
> On Fri, 12 Jul 2019 at 22:02, Mike Koldychev (mkoldych) <
> mkoldych@cisco.com> wrote:
>
> Hi WG,
>
> As per SPRING WG, SR Policy may contain multiple Candidate Paths and each
> Candidate Path may contain multiple Segment Lists. Existing SR standards =
in
> PCEP allow only a single ERO (one Segment List) for the SR Path in a
> stateful PCEP message. There is a need to signal multiple Segment Lists i=
n
> PCEP for this as well as other load balancing use cases.
>
> See the link that describes this, as well as list possible ways to achiev=
e
> this. Please provide your feedback on the list or during the WG session.
>
> https://github.com/dhruvdhody-huawei/105/blob/master/multiple_ERO_jl03a.p=
df
>
> Thanks,
> Mike.
>
> _______________________________________________
> Pce mailing list
> Pce@ietf.org
> https://www.ietf.org/mailman/listinfo/pce
>
>

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<div dir=3D"ltr">Hi Mike,=C2=A0<div><br></div><div>One of my point is that =
one optimization is a peculiar case of n optimization. For the particuliar =
case of candidate path, it can be attached to a given association, each TE-=
LSP can have the same optimization criterias.=C2=A0</div><div><br></div><di=
v>I understand the argument for Option 2 as &quot;I want to carry and manag=
e my constraint=C2=A0 (and candidate path) as one PCEP entity&quot;, the dr=
awback is that it will become complicated in case of inter-domain and OAM w=
hich are per path.<br>The case for option 1 is one path, one LSP, but as yo=
u pointed out it becomes complicated when there is one candidate path that =
desire a behavior similar to=C2=A0 LOAD-BALANCING where the PCC ask the PCE=
 to decide how many path are needed.</div><div><br>I think that option 1 is=
 better in term of protocol reuse and will offer more flexibility, but that=
 depends on how to deal with the PCE-managed number of paths.</div><div><br=
></div><div>I will not attend the IETF meeting,=C2=A0</div><div><br></div><=
div>Best regards,=C2=A0</div><div>Cyril</div><div><br></div><div><br></div>=
</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">=
On Fri, 19 Jul 2019 at 16:51, Mike Koldychev (mkoldych) &lt;<a href=3D"mail=
to:mkoldych@cisco.com">mkoldych@cisco.com</a>&gt; wrote:<br></div><blockquo=
te class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px =
solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_1383091988421577002WordSection1">
<p class=3D"MsoNormal">Hi Cyril,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Thanks a lot for your feedback! <u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Maybe I need to make it clear that the problem we=E2=
=80=99re trying to solve is a single optimization objective resulting in mu=
ltiple ECMP/UCMP paths. This is motivated by SR-TE Policy use case, where e=
ach Candidate Path represents a single optimization
 objective. The Candidate Path has a set of Segment Lists that satisfy the =
optimization objective.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">You seem to want to solve a different problem: two o=
r more different optimization objectives and each ECMP path is mapped to a =
different objective. In that case Solution 1 is absolutely necessary and it=
 would not have any of the down-sides,
 because the PCC knows in advance how many optimization objectives it has a=
nd can create that many PCEP LSPs. However for our problem, Solution 1 woul=
d introduce a lot of implementation complexity and protocol overhead.<u></u=
><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">We have a side-meeting scheduled on Wednesday at 8:3=
0 to discuss this topic, you are welcome to attend if you want to contribut=
e your input.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Thanks,<u></u><u></u></p>
<p class=3D"MsoNormal">Mike.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><b>From:</b> Cyril Margaria &lt;<a href=3D"mailto:cy=
ril.margaria@gmail.com" target=3D"_blank">cyril.margaria@gmail.com</a>&gt; =
<br>
<b>Sent:</b> Friday, July 19, 2019 9:37 AM<br>
<b>To:</b> Mike Koldychev (mkoldych) &lt;<a href=3D"mailto:mkoldych@cisco.c=
om" target=3D"_blank">mkoldych@cisco.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:pce@ietf.org" target=3D"_blank">pce@ietf.org</=
a><br>
<b>Subject:</b> Re: [Pce] Proposal for signaling ECMP or UCMP paths<u></u><=
u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">Hi,=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">On slide &quot;LSP objectives and constraints&quot;:=
 Stateless=C2=A0 PCE can compute set of EROs/Label switch paths using RFC60=
07, including multi-domain and multi-PCEs scenarios. This can be used for c=
omputing a set of EROs for SR candidate paths, one
 case that can apply to the candidate path and explicitly mentioned by the =
RFC is &quot;<span style=3D"font-size:10pt;color:black">Two or more end-to-=
end diverse paths&quot;.=C2=A0 This does not cover the stateful PCE case di=
rectly, but there are similar situations to what
 RFC6007 in the form of path protection (primary/secondary/standby) for sta=
tefull PCE, which use the association mechanism. Those two existing mechani=
sm exists to coordinate several paths and could be used to indicate how mul=
tiple paths are related and on how
 to signal them together (SVEC)=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black">On slide =
&quot;Analysis of Solution 1&quot;:<br>
=C2=A0 - For PCC-Initated LSPs: what prevents the PCE to to create PCE-Init=
iated LSPs using the same association id? This would tackle the problem.</s=
pan><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black">=C2=A0 - =
The possibility of each path to have different objective does seems to be a=
n advantage as its less restrictive. Having the same restriction on a set o=
f paths is easy, relaxing a restriction
 on the ERO #5 is more complicated (in term of encoding).=C2=A0<br>
=C2=A0 - There is a set of options to achieve the &quot;signal the set of p=
aths together&quot;:<br>
=C2=A0 =C2=A0 =C2=A0a)=C2=A0 set of LSPs can be reported in the same messag=
e, it can be enforced by the document defining that specific association ty=
pe.=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black">=C2=A0 =
=C2=A0 =C2=A0b) SVEC/SVEC List can be extended to statefull PCEP,=C2=A0</sp=
an><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black"><br>
That solution would work in case of multi-domain PCEs, and also be helpful =
for OAM and auto-bw mechanism.=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black">As a segm=
ent list is one path in the network, that maps nicely to one LSP.</span><u>=
</u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black">=C2=A0</s=
pan><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black">Solution =
2:=C2=A0=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black">=C2=A0 - =
This limit the set of constraints to be applied, policies like &quot;10% of=
 the traffic does not need to be protected&quot; cannot be expressed (it ca=
n be with solution 1, clear L bit of LSPA on one
 TE-LSP out of 10)=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black">=C2=A0 - =
2.a when the LSP is reported down : which ERO is down?, the same is applica=
ble for auto-bw and any form of OAM data.=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black">=C2=A0 - =
Solution 2.b allows for Optimized branch encoding, that should be disabled =
for that solution=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black">Slide &qu=
ot;Comparison of Solutions&quot;:</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black">=C2=A0 =
=C2=A0- There are solutions to most of the points raised for solution 1</sp=
an><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black">=C2=A0 =
=C2=A0- The database problem seems specific to one implementation, other im=
plementation will have the problem for solution 2=C2=A0</span><u></u><u></u=
></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black">=C2=A0 =
=C2=A0-=C2=A0 multi-PCE and multi-domain are not evaluated. Solutions and c=
onsideration are available for solution 1, not for solution 2. (experimenta=
l Inter-domain P2MP tree solutions exists).</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black">=C2=A0</s=
pan><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black">Best Rega=
rds,=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;color:black">Cyril</sp=
an><u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">On Fri, 12 Jul 2019 at 22:02, Mike Koldychev (mkoldy=
ch) &lt;<a href=3D"mailto:mkoldych@cisco.com" target=3D"_blank">mkoldych@ci=
sco.com</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<p class=3D"MsoNormal">Hi WG,<br>
<br>
As per SPRING WG, SR Policy may contain multiple Candidate Paths and each C=
andidate Path may contain multiple Segment Lists. Existing SR standards in =
PCEP allow only a single ERO (one Segment List) for the SR Path in a statef=
ul PCEP message. There is a need
 to signal multiple Segment Lists in PCEP for this as well as other load ba=
lancing use cases.
<br>
<br>
See the link that describes this, as well as list possible ways to achieve =
this. Please provide your feedback on the list or during the WG session.<br=
>
<br>
<a href=3D"https://github.com/dhruvdhody-huawei/105/blob/master/multiple_ER=
O_jl03a.pdf" target=3D"_blank">https://github.com/dhruvdhody-huawei/105/blo=
b/master/multiple_ERO_jl03a.pdf</a><br>
<br>
Thanks,<br>
Mike.<br>
<br>
_______________________________________________<br>
Pce mailing list<br>
<a href=3D"mailto:Pce@ietf.org" target=3D"_blank">Pce@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/pce" target=3D"_blank">htt=
ps://www.ietf.org/mailman/listinfo/pce</a><u></u><u></u></p>
</blockquote>
</div>
</div>
</div>

</blockquote></div>

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From: "Mike Koldychev (mkoldych)" <mkoldych@cisco.com>
To: Cyril Margaria <cyril.margaria@gmail.com>
CC: "pce@ietf.org" <pce@ietf.org>
Thread-Topic: [Pce] Proposal for signaling ECMP or UCMP paths
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Subject: Re: [Pce] Proposal for signaling ECMP or UCMP paths
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From: Huaimo Chen <huaimo.chen@futurewei.com>
To: Dhruv Dhody <dhruv.ietf@gmail.com>, "draft-chen-pce-sr-ingress-protection@ietf.org" <draft-chen-pce-sr-ingress-protection@ietf.org>
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To: Hariharan Ananthakrishnan <hari@netflix.com>, "younglee.tx@gmail.com" <younglee.tx@gmail.com>, "zhang.xian@huawei.com" <zhang.xian@huawei.com>
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Thread-Topic: IPR poll on draft-leedhody-pce-vn-association
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Archived-At: <https://mailarchive.ietf.org/arch/msg/pce/niG-jcNed_Cmue2k5GnQqEiZn0A>
Subject: Re: [Pce] IPR poll on draft-leedhody-pce-vn-association
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Hi,

=20

No i=E2=80=99m not aware of any IPR.

BR

=20

Daniele =20

=20

From: Hariharan Ananthakrishnan <hari@netflix.com>=20
Sent: den 15 juli 2019 11:27
To: younglee.tx@gmail.com; zhang.xian@huawei.com; Daniele Ceccarelli =
<daniele.ceccarelli@ericsson.com>
Cc: pce@ietf.org
Subject: IPR poll on draft-leedhody-pce-vn-association

=20

Hi Authors,
=20
In preparation for Working Group adoption on this draft, I'd like all
authors and contributors to confirm on the list that they are in =
compliance
with IETF IPR rules.
One IPR has already been disclosed:  =
<https://datatracker.ietf.org/ipr/3329/> =
https://datatracker.ietf.org/ipr/3329/
Please respond (copying the mailing list) to say one of:
=20
I am not aware of any IPR applicable to this draft that should be =
disclosed
in accordance with IETF IPR rules.
=20
I am aware of IPR applicable to this draft, and it has already been
disclosed to the IETF.
=20
I am aware of IPR applicable to this draft, but that has not yet been
disclosed to the IETF. I will work to ensure that it will be disclosed =
in a
timely manner.
=20
Thanks,
- Hari

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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>Hi,<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>No i=E2=80=99m not aware of any =
IPR.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>BR<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>Daniele=C2=A0 =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><b><span lang=3DEN-US>From:</span></b><span =
lang=3DEN-US> Hariharan Ananthakrishnan &lt;hari@netflix.com&gt; =
<br><b>Sent:</b> den 15 juli 2019 11:27<br><b>To:</b> =
younglee.tx@gmail.com; zhang.xian@huawei.com; Daniele Ceccarelli =
&lt;daniele.ceccarelli@ericsson.com&gt;<br><b>Cc:</b> =
pce@ietf.org<br><b>Subject:</b> IPR poll on =
draft-leedhody-pce-vn-association<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'>Hi =
Authors,<o:p></o:p></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'><o:p>&nbsp;</o:p=
></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'>In preparation =
for Working Group adoption on this draft, I'd like =
all<o:p></o:p></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'>authors and =
contributors to confirm on the list that they are in =
compliance<o:p></o:p></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'>with IETF IPR =
rules.</span><span style=3D'color:#212529'><o:p></o:p></span></pre><pre =
style=3D'white-space:pre-wrap;box-sizing:border-box;margin-bottom:1rem;ov=
erflow:auto'><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'>One IPR has =
already been disclosed: </span><span style=3D'color:#212529'><a =
href=3D"https://datatracker.ietf.org/ipr/3329/"><span =
style=3D'font-family:"Verdana",sans-serif'>https://datatracker.ietf.org/i=
pr/3329/</span></a><o:p></o:p></span></pre><pre =
style=3D'white-space:pre-wrap;box-sizing:border-box;margin-bottom:1rem;ov=
erflow:auto'><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'>Please respond =
(copying the mailing list) to say one =
of:<o:p></o:p></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'><o:p>&nbsp;</o:p=
></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'>I am not aware =
of any IPR applicable to this draft that should be =
disclosed<o:p></o:p></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'>in accordance =
with IETF IPR rules.<o:p></o:p></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'><o:p>&nbsp;</o:p=
></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'>I am aware of =
IPR applicable to this draft, and it has already =
been<o:p></o:p></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'>disclosed to =
the IETF.<o:p></o:p></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'><o:p>&nbsp;</o:p=
></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'>I am aware of =
IPR applicable to this draft, but that has not yet =
been<o:p></o:p></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'>disclosed to =
the IETF. I will work to ensure that it will be disclosed in =
a<o:p></o:p></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'>timely =
manner.<o:p></o:p></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'><o:p>&nbsp;</o:p=
></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'>Thanks,<o:p></o:=
p></span></pre><pre><span =
style=3D'font-family:"Verdana",sans-serif;color:#212529'>- =
Hari</span><span =
style=3D'color:#212529'><o:p></o:p></span></pre></div></div></div></body>=
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From: Daniele Ceccarelli <daniele.ceccarelli@ericsson.com>
To: Young Lee <younglee.tx@gmail.com>, "adrian@olddog.co.uk" <adrian@olddog.co.uk>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/pce/MSm4JRNQNo67IF0VWFqNlsVYEbs>
Subject: Re: [Pce] PCE WG Adoption poll for draft-leedhody-pce-vn-association
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Yes/Support.



BR



Daniele



From: Young Lee <younglee.tx@gmail.com>
Sent: den 14 juli 2019 22:27
To: adrian@olddog.co.uk
Cc: pce@ietf.org; draft-leedhody-pce-vn-association@ietf.org
Subject: Re: PCE WG Adoption poll for draft-leedhody-pce-vn-association



Yes/Support.



Young (co-author)



On Sun, Jul 14, 2019, 8:00 AM Adrian Farrel <adrian@olddog.co.uk 
<mailto:adrian@olddog.co.uk> > wrote:

Hi WG,

He authors of draft-leedhody-pce-vn-association have been asking for
adoption and...

- the base PCEP association extensions seem to be stable and advancing
- I did an early review and the authors span a new version

So, this starts an adoption poll for the draft. Because IETF-105 is imminent
and you all have lots to do and read, we'll make this a three week poll
ending on 4th August.

Please send your comments of support or antipathy.

In either case, please indicate whether or not you have read the draft, and
if you support it, please say whether or not you propose to and even
possibly implement the draft.

Many thanks,
Adrian (for the chairs)


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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>Yes/Support.<o:p></o:p></span></p><p=
 class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'>BR<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DIT>Daniele=C2=A0 <o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><b><span lang=3DEN-US>From:</span></b><span =
lang=3DEN-US> Young Lee &lt;younglee.tx@gmail.com&gt; <br><b>Sent:</b> =
den 14 juli 2019 22:27<br><b>To:</b> adrian@olddog.co.uk<br><b>Cc:</b> =
pce@ietf.org; =
draft-leedhody-pce-vn-association@ietf.org<br><b>Subject:</b> Re: PCE WG =
Adoption poll for =
draft-leedhody-pce-vn-association<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><p =
class=3DMsoNormal>Yes/Support.<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Young (co-author)<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p class=3DMsoNormal>On =
Sun, Jul 14, 2019, 8:00 AM Adrian Farrel &lt;<a =
href=3D"mailto:adrian@olddog.co.uk">adrian@olddog.co.uk</a>&gt; =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>Hi WG,<br><br>He authors of =
draft-leedhody-pce-vn-association have been asking for<br>adoption =
and...<br><br>- the base PCEP association extensions seem to be stable =
and advancing<br>- I did an early review and the authors span a new =
version<br><br>So, this starts an adoption poll for the draft. Because =
IETF-105 is imminent<br>and you all have lots to do and read, we'll make =
this a three week poll<br>ending on 4th August.<br><br>Please send your =
comments of support or antipathy.<br><br>In either case, please indicate =
whether or not you have read the draft, and<br>if you support it, please =
say whether or not you propose to and even<br>possibly implement the =
draft.<br><br>Many thanks,<br>Adrian (for the =
chairs)<o:p></o:p></p></blockquote></div></div></body></html>
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From: "Mike Koldychev (mkoldych)" <mkoldych@cisco.com>
To: "Mike Koldychev (mkoldych)" <mkoldych@cisco.com>, Cyril Margaria <cyril.margaria@gmail.com>
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Thread-Topic: [Pce] Proposal for signaling ECMP or UCMP paths
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Subject: Re: [Pce] Proposal for signaling ECMP or UCMP paths
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Subject: Re: [Pce] Roman Danyliw's No Objection on draft-ietf-pce-inter-area-as-applicability-07: (with COMMENT)
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Thank you for the review Roman.=20

We have added a reference to RFC4920. I believe Jon and Dhruv have =
clarified the "lack of reviews" comment.=20

BR, Dan. =20

-----Original Message-----
From: Roman Danyliw via Datatracker <noreply@ietf.org>=20
Sent: 13 June 2019 09:00
To: The IESG <iesg@ietf.org>
Cc: draft-ietf-pce-inter-area-as-applicability@ietf.org; Jonathan =
Hardwick <jonathan.hardwick@metaswitch.com>; pce-chairs@ietf.org; =
jonathan.hardwick@metaswitch.com; pce@ietf.org
Subject: Roman Danyliw's No Objection on =
draft-ietf-pce-inter-area-as-applicability-07: (with COMMENT)

Roman Danyliw has entered the following ballot position for
draft-ietf-pce-inter-area-as-applicability-07: No Objection


Please refer to =
https://www.ietf.org/iesg/statement/discuss-criteria.html
for more information about IESG DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-pce-inter-area-as-applicabili=
ty/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

(1) I share Mirja=E2=80=99s concerns about the lack of review per the =
shepherd write-up


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Subject: Re: [Pce] Benjamin Kaduk's No Objection on draft-ietf-pce-inter-area-as-applicability-07: (with COMMENT)
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Thank you Benjamin for the detailed review. We have addressed all the =
NITs, a few further clarifications/thoughts on the other points you =
raised:

>> Section 1.5
>> RFCs 5088 and 5089 are for OSPV and IS-IS discovery mechanisms.  =
Aren't those inherently (in some sense) limited to a single IGP area, =
making it difficult to discover PCEs located in other ASes?

We modified the text to underline the single domain applicability for =
PCE capability discovery via IGP extensions.=20

>> Section 4.2
>> Are there references available for the numbers claimed in this =
section? (They seem reasonable to me, but for archival purposes it can =
be helpful.)

I hunted high and low to find my original quote (via email), for domain =
sizing in Section 4.2., I failed. I remember the assertion was made by =
one of our operator conversations. We updated Section 4.2 text to read:

"Network operator feedback in the development of the document =
highlighted that node degree (the number of neighbors per node) =
typically ranges from 3 to 10 (4-5 is quite common).=20

BR, Dan.=20

-----Original Message-----
From: Benjamin Kaduk via Datatracker <noreply@ietf.org>=20
Sent: 13 June 2019 10:33
To: The IESG <iesg@ietf.org>
Cc: draft-ietf-pce-inter-area-as-applicability@ietf.org; Jonathan =
Hardwick <jonathan.hardwick@metaswitch.com>; pce-chairs@ietf.org; =
jonathan.hardwick@metaswitch.com; pce@ietf.org
Subject: Benjamin Kaduk's No Objection on =
draft-ietf-pce-inter-area-as-applicability-07: (with COMMENT)

Benjamin Kaduk has entered the following ballot position for
draft-ietf-pce-inter-area-as-applicability-07: No Objection

When responding, please keep the subject line intact and reply to all =
email addresses included in the To and CC lines. (Feel free to cut this =
introductory paragraph, however.)


Please refer to =
https://www.ietf.org/iesg/statement/discuss-criteria.html
for more information about IESG DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-pce-inter-area-as-applicabili=
ty/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

This document claims to be an "applicability statement" but is being =
published as Informational.  Is the divergence from an RFC 2026 =
Applicability Statement intentional?

I share other AD's concerns about the lack of review indicated in the =
shepherd writeup, though to some extent the content seems obviously =
true.

Section 1

                                                                      A
   number of issues exist for routing in multi-domain networks, these
   include:

nit: this is a comma splice.

Section 1.1

Perhaps the first two paragraphs could indicate that the first paragraph =
is considering general usage, outside of this document, while the second =
paragraph restricts to just the current usage in this document.

Section 1.2

   architecture defined in [RFC4655]. When a path has required the Path
   Computation Client (PCC) will send a request to the PCE. The PCE

nit: "is required" (or "has been requested", I suppose)

Section 1.5

RFCs 5088 and 5089 are for OSPV and IS-IS discovery mechanisms.  Aren't =
those inherently (in some sense) limited to a single IGP area, making it =
difficult to discover PCEs located in other ASes?

Section 4.2

Are there references available for the numbers claimed in this section?
(They seem reasonable to me, but for archival purposes it can be
helpful.)

Section 4.5

   An operator may also need to avoid a path that uses specified nodes
   for administrative reasons, or if a specific connectivity
   service required to have a 1+1 protection capability, two
   completely disjoint paths must be established, Shared Risk Link
   Group (SRLG) information may be provided to ensure path diversity.

I think maybe the last comma is a comma splice?  The distribution of =
SRLG information does seem to be somewhat different from the =
requirements for various types of paths, at least.

Section 5.1.2

nit: "zero, one or more" seems equivalent to "zero or more"

Section 7.2

Please expand OSS.

Section 13

   PCEP security is defined [RFC5440].  [...]

(nit?) It seems that 5440 just says "use IPsec (or TCP-MD5), which is =
not exactly in-protocol "PCEP security" per se.

As the secdir reviewer notes, some additional guidance on what to do =
when crossing administrative boundaries is probably in order.




From nobody Wed Jul 24 22:16:17 2019
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From: Mahendra Singh Negi <mahendrasingh@huawei.com>
To: "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "pce@ietf.org" <pce@ietf.org>
CC: "draft-leedhody-pce-vn-association@ietf.org" <draft-leedhody-pce-vn-association@ietf.org>
Thread-Topic: [Pce] PCE WG Adoption poll for draft-leedhody-pce-vn-association
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Subject: Re: [Pce] PCE WG Adoption poll for draft-leedhody-pce-vn-association
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Yes/Support

Thanks,
Mahendra

-----Original Message-----
From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Adrian Farrel
Sent: 14 July 2019 18:30
To: pce@ietf.org
Cc: draft-leedhody-pce-vn-association@ietf.org
Subject: [Pce] PCE WG Adoption poll for draft-leedhody-pce-vn-association

Hi WG,

He authors of draft-leedhody-pce-vn-association have been asking for adopti=
on and...

- the base PCEP association extensions seem to be stable and advancing
- I did an early review and the authors span a new version

So, this starts an adoption poll for the draft. Because IETF-105 is imminen=
t and you all have lots to do and read, we'll make this a three week poll e=
nding on 4th August.

Please send your comments of support or antipathy.

In either case, please indicate whether or not you have read the draft, and=
 if you support it, please say whether or not you propose to and even possi=
bly implement the draft.

Many thanks,
Adrian (for the chairs)

_______________________________________________
Pce mailing list
Pce@ietf.org
https://www.ietf.org/mailman/listinfo/pce


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From: "Stone, Andrew (Nokia - CA/Ottawa)" <andrew.stone@nokia.com>
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From: "Mike Koldychev (mkoldych)" <mkoldych@cisco.com>
To: "pce@ietf.org" <pce@ietf.org>, "jefftant.ietf@gmail.com" <jefftant.ietf@gmail.com>, "Stone, Andrew (Nokia - CA/Ottawa)" <andrew.stone@nokia.com>, "vishnupavan.ietf@gmail.com" <vishnupavan.ietf@gmail.com>
Thread-Topic: [Pce] Proposal for signaling ECMP or UCMP paths
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Subject: Re: [Pce] Proposal for signaling ECMP or UCMP paths
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Date: Fri, 26 Jul 2019 10:21:21 -0400
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: "=?utf-8?Q?pce=40ietf.org?=" <pce@ietf.org>,  "=?utf-8?Q?Stone=2C_Andrew_(Nokia_-_CA/Ottawa)?=" <andrew.stone@nokia.com>, "=?utf-8?Q?vishnupavan.ietf=40gmail.com?=" <vishnupavan.ietf@gmail.com>, "Mike Koldychev (mkoldych)" <mkoldych@cisco.com>
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Subject: Re: [Pce] Proposal for signaling ECMP or UCMP paths
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Mike,

Thanks for the consideration.
That was exactly my point, having a number of different drafts that are s=
hort, concise and focused on a particular problem has always been my pref=
erence.
The use cases are different, while they don=E2=80=99t conflict they are a=
lso don=E2=80=99t =E2=80=9Crequire=E2=80=9D each other. It is perfectly f=
ine for drafts to reference each other and outline the interdependencies,=
 if any.

Cheers,
Jeff
On Jul 26, 2019, 5:55 AM -0400, Mike Koldychev (mkoldych) <mkoldych=40cis=
co.com>, wrote:
> Hi Jeff, and WG,
>
> To follow up on your comment about making these 2 separate documents: o=
ne for ECMP within a single LSP and another for ECMP among different LSPs=
.
>
> That may be a good idea, since the mechanisms for achieving these two a=
re quite different, so they are better kept separate. Just as long as it=E2=
=80=99s understood that they are not =E2=80=9Cconflicting=E2=80=9D soluti=
ons.
>
> Thanks,
> Mike.
>
> =46rom: Mike Koldychev (mkoldych)
> Sent: Tuesday, July 23, 2019 9:03 AM
> To: Mike Koldychev (mkoldych) <mkoldych=40cisco.com>; Cyril Margaria <c=
yril.margaria=40gmail.com>
> Cc: pce=40ietf.org
> Subject: RE: =5BPce=5D Proposal for signaling ECMP or UCMP paths
>
> Hi,
>
> I have updated the slides based on our discussion.
>
> https://github.com/mkoldych-cisco/ietf105/blob/master/pcep=5Fmultiple=5F=
ERO.pptx
>
> We plan to discuss the issue further on Wednesday at 8:30 at the side m=
eeting.
>
> https://trac.ietf.org/trac/ietf/meeting/wiki/105sidemeetings
>
> Thanks,
> Mike.
>
> =46rom: Pce <pce-bounces=40ietf.org> On Behalf Of Mike Koldychev (mkold=
ych)
> Sent: =46riday, July 19, 2019 1:03 PM
> To: Cyril Margaria <cyril.margaria=40gmail.com>
> Cc: pce=40ietf.org
> Subject: Re: =5BPce=5D Proposal for signaling ECMP or UCMP paths
>
> Hi Cyril,
>
> Like I wrote in the slides=E2=80=A6 Solution 1 may work if you *only* d=
o PCE-initiated, because the PCC never requests anything from the PCE, it=
 simply installs whatever the PCE pushes down. Even for PCE-initiated, th=
ere are some issues, such as forcing the PCE to encode all the LSP object=
s into one message, to force them to get installed at the same time. Also=
 you would need to handle fragmentation, if you cannot fit all the LSPs i=
nto a single message.
>
> Thanks,
> Mike.
>
> =46rom: Cyril Margaria <cyril.margaria=40gmail.com>
> Sent: =46riday, July 19, 2019 12:23 PM
> To: Mike Koldychev (mkoldych) <mkoldych=40cisco.com>
> Cc: pce=40ietf.org
> Subject: Re: =5BPce=5D Proposal for signaling ECMP or UCMP paths
>
> Hi Mike,
>
> One of my point is that one optimization is a peculiar case of n optimi=
zation. =46or the particuliar case of candidate path, it can be attached =
to a given association, each TE-LSP can have the same optimization criter=
ias.
>
> I understand the argument for Option 2 as =22I want to carry and manage=
 my constraint=C2=A0 (and candidate path) as one PCEP entity=22, the draw=
back is that it will become complicated in case of inter-domain and OAM w=
hich are per path.
> The case for option 1 is one path, one LSP, but as you pointed out it b=
ecomes complicated when there is one candidate path that desire a behavio=
r similar to=C2=A0 LOAD-BALANCING where the PCC ask the PCE to decide how=
 many path are needed.
>
> I think that option 1 is better in term of protocol reuse and will offe=
r more flexibility, but that depends on how to deal with the PCE-managed =
number of paths.
>
> I will not attend the IET=46 meeting,
>
> Best regards,
> Cyril
>
>
>
> On =46ri, 19 Jul 2019 at 16:51, Mike Koldychev (mkoldych) <mkoldych=40c=
isco.com> wrote:
> > Hi Cyril,
> >
> > Thanks a lot for your feedback=21
> >
> > Maybe I need to make it clear that the problem we=E2=80=99re trying t=
o solve is a single optimization objective resulting in multiple ECMP/UCM=
P paths. This is motivated by SR-TE Policy use case, where each Candidate=
 Path represents a single optimization objective. The Candidate Path has =
a set of Segment Lists that satisfy the optimization objective.
> >
> > You seem to want to solve a different problem: two or more different =
optimization objectives and each ECMP path is mapped to a different objec=
tive. In that case Solution 1 is absolutely necessary and it would not ha=
ve any of the down-sides, because the PCC knows in advance how many optim=
ization objectives it has and can create that many PCEP LSPs. However for=
 our problem, Solution 1 would introduce a lot of implementation complexi=
ty and protocol overhead.
> >
> > We have a side-meeting scheduled on Wednesday at 8:30 to discuss this=
 topic, you are welcome to attend if you want to contribute your input.
> >
> > Thanks,
> > Mike.
> >
> > =46rom: Cyril Margaria <cyril.margaria=40gmail.com>
> > Sent: =46riday, July 19, 2019 9:37 AM
> > To: Mike Koldychev (mkoldych) <mkoldych=40cisco.com>
> > Cc: pce=40ietf.org
> > Subject: Re: =5BPce=5D Proposal for signaling ECMP or UCMP paths
> >
> > Hi,
> >
> > On slide =22LSP objectives and constraints=22: Stateless=C2=A0 PCE ca=
n compute set of EROs/Label switch paths using R=46C6007, including multi=
-domain and multi-PCEs scenarios. This can be used for computing a set of=
 EROs for SR candidate paths, one case that can apply to the candidate pa=
th and explicitly mentioned by the R=46C is =22Two or more end-to-end div=
erse paths=22.=C2=A0 This does not cover the stateful PCE case directly, =
but there are similar situations to what R=46C6007 in the form of path pr=
otection (primary/secondary/standby) for statefull PCE, which use the ass=
ociation mechanism. Those two existing mechanism exists to coordinate sev=
eral paths and could be used to indicate how multiple paths are related a=
nd on how to signal them together (SVEC)
> >
> > On slide =22Analysis of Solution 1=22:
> > =C2=A0 - =46or PCC-Initated LSPs: what prevents the PCE to to create =
PCE-Initiated LSPs using the same association id=3F This would tackle the=
 problem.
> > =C2=A0 - The possibility of each path to have different objective doe=
s seems to be an advantage as its less restrictive. Having the same restr=
iction on a set of paths is easy, relaxing a restriction on the ERO =235 =
is more complicated (in term of encoding).
> > =C2=A0 - There is a set of options to achieve the =22signal the set o=
f paths together=22:
> > =C2=A0 =C2=A0 =C2=A0a)=C2=A0 set of LSPs can be reported in the same =
message, it can be enforced by the document defining that specific associ=
ation type.
> > =C2=A0 =C2=A0 =C2=A0b) SVEC/SVEC List can be extended to statefull PC=
EP,
> >
> > That solution would work in case of multi-domain PCEs, and also be he=
lpful for OAM and auto-bw mechanism.
> > As a segment list is one path in the network, that maps nicely to one=
 LSP.
> >
> >
> > Solution 2:
> > =C2=A0 - This limit the set of constraints to be applied, policies li=
ke =2210% of the traffic does not need to be protected=22 cannot be expre=
ssed (it can be with solution 1, clear L bit of LSPA on one TE-LSP out of=
 10)
> > =C2=A0 - 2.a when the LSP is reported down : which ERO is down=3F, th=
e same is applicable for auto-bw and any form of OAM data.
> > =C2=A0 - Solution 2.b allows for Optimized branch encoding, that shou=
ld be disabled for that solution
> >
> >
> > Slide =22Comparison of Solutions=22:
> > =C2=A0 =C2=A0- There are solutions to most of the points raised for s=
olution 1
> > =C2=A0 =C2=A0- The database problem seems specific to one implementat=
ion, other implementation will have the problem for solution 2
> > =C2=A0 =C2=A0-=C2=A0 multi-PCE and multi-domain are not evaluated. So=
lutions and consideration are available for solution 1, not for solution =
2. (experimental Inter-domain P2MP tree solutions exists).
> >
> > Best Regards,
> > Cyril
> >
> > On =46ri, 12 Jul 2019 at 22:02, Mike Koldychev (mkoldych) <mkoldych=40=
cisco.com> wrote:
> > > Hi WG,
> > >
> > > As per SPRING WG, SR Policy may contain multiple Candidate Paths an=
d each Candidate Path may contain multiple Segment Lists. Existing SR sta=
ndards in PCEP allow only a single ERO (one Segment List) for the SR Path=
 in a stateful PCEP message. There is a need to signal multiple Segment L=
ists in PCEP for this as well as other load balancing use cases.
> > >
> > > See the link that describes this, as well as list possible ways to =
achieve this. Please provide your feedback on the list or during the WG s=
ession.
> > >
> > > https://github.com/dhruvdhody-huawei/105/blob/master/multiple=5FERO=
=5Fjl03a.pdf
> > >
> > > Thanks,
> > > Mike.
> > >
> > > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F
> > > Pce mailing list
> > > Pce=40ietf.org
> > > https://www.ietf.org/mailman/listinfo/pce

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<div name=3D=22messageBodySection=22>
<div dir=3D=22auto=22>Mike,
<div dir=3D=22auto=22><br /></div>
<div dir=3D=22auto=22>Thanks for the consideration.</div>
<div dir=3D=22auto=22>That was exactly my point, having a number of diffe=
rent drafts that are short, concise and focused on a particular problem h=
as always been my preference.</div>
<div dir=3D=22auto=22>The use cases are different, while they don=E2=80=99=
t conflict they are also don=E2=80=99t =E2=80=9Crequire=E2=80=9D each oth=
er. It is perfectly fine for drafts to reference each other and outline t=
he interdependencies, if any.</div>
</div>
</div>
<div name=3D=22messageSignatureSection=22><br />
<div class=3D=22match=46ont=22>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D=22messageReplySection=22>On Jul 26, 2019, 5:55 AM -0400, Mik=
e Koldychev (mkoldych) &lt;mkoldych=40cisco.com&gt;, wrote:<br />
<blockquote type=3D=22cite=22 class=3D=22spark=5Fquote=22 style=3D=22marg=
in: 5px 5px; padding-left: 10px; border-left: thin solid =231abc9c;=22>
<div class=3D=22WordSection1=22>
<p class=3D=22MsoNormal=22>Hi Jeff, and WG,</p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22>To follow up on your comment about making thes=
e 2 separate documents: one for ECMP within a single LSP and another for =
ECMP among different LSPs.</p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22>That may be a good idea, since the mechanisms =
for achieving these two are quite different, so they are better kept sepa=
rate. Just as long as it=E2=80=99s understood that they are not =E2=80=9C=
conflicting=E2=80=9D solutions.</p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22>Thanks,</p>
<p class=3D=22MsoNormal=22>Mike.</p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<div>
<div style=3D=22border:none;border-top:solid =23E1E1E1 1.0pt;padding:3.0p=
t 0in 0in 0in=22>
<p class=3D=22MsoNormal=22><b>=46rom:</b> Mike Koldychev (mkoldych)<br />=

<b>Sent:</b> Tuesday, July 23, 2019 9:03 AM<br />
<b>To:</b> Mike Koldychev (mkoldych) &lt;mkoldych=40cisco.com&gt;; Cyril =
Margaria &lt;cyril.margaria=40gmail.com&gt;<br />
<b>Cc:</b> pce=40ietf.org<br />
<b>Subject:</b> RE: =5BPce=5D Proposal for signaling ECMP or UCMP paths</=
p>
</div>
</div>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22>Hi,</p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22>I have updated the slides based on our discuss=
ion.</p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22><a href=3D=22https://github.com/mkoldych-cisco=
/ietf105/blob/master/pcep=5Fmultiple=5FERO.pptx=22>https://github.com/mko=
ldych-cisco/ietf105/blob/master/pcep=5Fmultiple=5FERO.pptx</a></p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22>We plan to discuss the issue further on Wednes=
day at 8:30 at the side meeting.</p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22><a href=3D=22https://trac.ietf.org/trac/ietf/m=
eeting/wiki/105sidemeetings=22>https://trac.ietf.org/trac/ietf/meeting/wi=
ki/105sidemeetings</a></p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22>Thanks,</p>
<p class=3D=22MsoNormal=22>Mike.</p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<div>
<div style=3D=22border:none;border-top:solid =23E1E1E1 1.0pt;padding:3.0p=
t 0in 0in 0in=22>
<p class=3D=22MsoNormal=22><b>=46rom:</b> Pce &lt;<a href=3D=22mailto:pce=
-bounces=40ietf.org=22>pce-bounces=40ietf.org</a>&gt; <b>On Behalf Of</b>=
 Mike Koldychev (mkoldych)<br />
<b>Sent:</b> =46riday, July 19, 2019 1:03 PM<br />
<b>To:</b> Cyril Margaria &lt;<a href=3D=22mailto:cyril.margaria=40gmail.=
com=22>cyril.margaria=40gmail.com</a>&gt;<br />
<b>Cc:</b> <a href=3D=22mailto:pce=40ietf.org=22>pce=40ietf.org</a><br />=

<b>Subject:</b> Re: =5BPce=5D Proposal for signaling ECMP or UCMP paths</=
p>
</div>
</div>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22>Hi Cyril,</p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22>Like I wrote in the slides=E2=80=A6 Solution 1=
 may work if you *<b>only</b>* do PCE-initiated, because the PCC never re=
quests anything from the PCE, it simply installs whatever the PCE pushes =
down. Even for PCE-initiated, there are some issues, such as forcing the =
PCE to encode all the LSP objects into one message, to force them to get =
installed at the same time. Also you would need to handle fragmentation, =
if you cannot fit all the LSPs into a single message.</p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22>Thanks,</p>
<p class=3D=22MsoNormal=22>Mike.</p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22><b>=46rom:</b> Cyril Margaria &lt;<a href=3D=22=
mailto:cyril.margaria=40gmail.com=22>cyril.margaria=40gmail.com</a>&gt;<b=
r />
<b>Sent:</b> =46riday, July 19, 2019 12:23 PM<br />
<b>To:</b> Mike Koldychev (mkoldych) &lt;<a href=3D=22mailto:mkoldych=40c=
isco.com=22>mkoldych=40cisco.com</a>&gt;<br />
<b>Cc:</b> <a href=3D=22mailto:pce=40ietf.org=22>pce=40ietf.org</a><br />=

<b>Subject:</b> Re: =5BPce=5D Proposal for signaling ECMP or UCMP paths</=
p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<div>
<p class=3D=22MsoNormal=22>Hi Mike,&=23160;</p>
<div>
<p class=3D=22MsoNormal=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22>One of my point is that one optimization is a =
peculiar case of n optimization. =46or the particuliar case of candidate =
path, it can be attached to a given association, each TE-LSP can have the=
 same optimization criterias.&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22>I understand the argument for Option 2 as =22I=
 want to carry and manage my constraint&=23160; (and candidate path) as o=
ne PCEP entity=22, the drawback is that it will become complicated in cas=
e of inter-domain and OAM which are per path.<br />
The case for option 1 is one path, one LSP, but as you pointed out it bec=
omes complicated when there is one candidate path that desire a behavior =
similar to&=23160; LOAD-BALANCING where the PCC ask the PCE to decide how=
 many path are needed.</p>
</div>
<div>
<p class=3D=22MsoNormal=22><br />
I think that option 1 is better in term of protocol reuse and will offer =
more flexibility, but that depends on how to deal with the PCE-managed nu=
mber of paths.</p>
</div>
<div>
<p class=3D=22MsoNormal=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22>I will not attend the IET=46 meeting,&=23160;<=
/p>
</div>
<div>
<p class=3D=22MsoNormal=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22>Best regards,&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22>Cyril</p>
</div>
<div>
<p class=3D=22MsoNormal=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22>&=23160;</p>
</div>
</div>
<p class=3D=22MsoNormal=22>&=23160;</p>
<div>
<div>
<p class=3D=22MsoNormal=22>On =46ri, 19 Jul 2019 at 16:51, Mike Koldychev=
 (mkoldych) &lt;<a href=3D=22mailto:mkoldych=40cisco.com=22>mkoldych=40ci=
sco.com</a>&gt; wrote:</p>
</div>
<blockquote style=3D=22margin: 5px 5px; padding-left: 10px; border-left: =
thin solid =23e67e22;=22 class=3D=22spark=5Fquote=22>
<div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>Hi Cyril,</p>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>&=23160;</p>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>Thanks a lot for your feedback=21</p>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>&=23160;</p>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>Maybe I need to make it clear that the problem we=E2=80=
=99re trying to solve is a single optimization objective resulting in mul=
tiple ECMP/UCMP paths. This is motivated by SR-TE Policy use case, where =
each Candidate Path represents a single optimization objective. The Candi=
date Path has a set of Segment Lists that satisfy the optimization object=
ive.</p>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>&=23160;</p>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>You seem to want to solve a different problem: two or =
more different optimization objectives and each ECMP path is mapped to a =
different objective. In that case Solution 1 is absolutely necessary and =
it would not have any of the down-sides, because the PCC knows in advance=
 how many optimization objectives it has and can create that many PCEP LS=
Ps. However for our problem, Solution 1 would introduce a lot of implemen=
tation complexity and protocol overhead.</p>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>&=23160;</p>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>We have a side-meeting scheduled on Wednesday at 8:30 =
to discuss this topic, you are welcome to attend if you want to contribut=
e your input.</p>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>&=23160;</p>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>Thanks,</p>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>Mike.</p>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>&=23160;</p>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><b>=46rom:</b> Cyril Margaria &lt;<a href=3D=22mailto:=
cyril.margaria=40gmail.com=22 target=3D=22=5Fblank=22>cyril.margaria=40gm=
ail.com</a>&gt;<br />
<b>Sent:</b> =46riday, July 19, 2019 9:37 AM<br />
<b>To:</b> Mike Koldychev (mkoldych) &lt;<a href=3D=22mailto:mkoldych=40c=
isco.com=22 target=3D=22=5Fblank=22>mkoldych=40cisco.com</a>&gt;<br />
<b>Cc:</b> <a href=3D=22mailto:pce=40ietf.org=22 target=3D=22=5Fblank=22>=
pce=40ietf.org</a><br />
<b>Subject:</b> Re: =5BPce=5D Proposal for signaling ECMP or UCMP paths</=
p>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>&=23160;</p>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>Hi,&=23160;</p>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>On slide =22LSP objectives and constraints=22: Statele=
ss&=23160; PCE can compute set of EROs/Label switch paths using R=46C6007=
, including multi-domain and multi-PCEs scenarios. This can be used for c=
omputing a set of EROs for SR candidate paths, one case that can apply to=
 the candidate path and explicitly mentioned by the R=46C is =22<span sty=
le=3D=22font-size:10.0pt;color:black=22>Two or more end-to-end diverse pa=
ths=22.&=23160; This does not cover the stateful PCE case directly, but t=
here are similar situations to what R=46C6007 in the form of path protect=
ion (primary/secondary/standby) for statefull PCE, which use the associat=
ion mechanism. Those two existing mechanism exists to coordinate several =
paths and could be used to indicate how multiple paths are related and on=
 how to signal them together (SVEC)&=23160;</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22>On sl=
ide =22Analysis of Solution 1=22:<br />
&=23160; - =46or PCC-Initated LSPs: what prevents the PCE to to create PC=
E-Initiated LSPs using the same association id=3F This would tackle the p=
roblem.</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22>&=231=
60; - The possibility of each path to have different objective does seems=
 to be an advantage as its less restrictive. Having the same restriction =
on a set of paths is easy, relaxing a restriction on the ERO =235 is more=
 complicated (in term of encoding).&=23160;<br />
&=23160; - There is a set of options to achieve the =22signal the set of =
paths together=22:<br />
&=23160; &=23160; &=23160;a)&=23160; set of LSPs can be reported in the s=
ame message, it can be enforced by the document defining that specific as=
sociation type.&=23160;</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22>&=231=
60; &=23160; &=23160;b) SVEC/SVEC List can be extended to statefull PCEP,=
&=23160;</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22><br /=
>
That solution would work in case of multi-domain PCEs, and also be helpfu=
l for OAM and auto-bw mechanism.&=23160;</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22>As a =
segment list is one path in the network, that maps nicely to one LSP.</sp=
an></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22>&=231=
60;</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22>Solut=
ion 2:&=23160;&=23160;</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22>&=231=
60; - This limit the set of constraints to be applied, policies like =221=
0% of the traffic does not need to be protected=22 cannot be expressed (i=
t can be with solution 1, clear L bit of LSPA on one TE-LSP out of 10)&=23=
160;</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22>&=231=
60; - 2.a when the LSP is reported down : which ERO is down=3F, the same =
is applicable for auto-bw and any form of OAM data.&=23160;</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22>&=231=
60; - Solution 2.b allows for Optimized branch encoding, that should be d=
isabled for that solution&=23160;</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>&=23160;</p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22>Slide=
 =22Comparison of Solutions=22:</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22>&=231=
60; &=23160;- There are solutions to most of the points raised for soluti=
on 1</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22>&=231=
60; &=23160;- The database problem seems specific to one implementation, =
other implementation will have the problem for solution 2&=23160;</span><=
/p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22>&=231=
60; &=23160;-&=23160; multi-PCE and multi-domain are not evaluated. Solut=
ions and consideration are available for solution 1, not for solution 2. =
(experimental Inter-domain P2MP tree solutions exists).</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22>&=231=
60;</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22>Best =
Regards,&=23160;</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22><span style=3D=22font-size:10.0pt;color:black=22>Cyril=
</span></p>
</div>
</div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>&=23160;</p>
<div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>On =46ri, 12 Jul 2019 at 22:02, Mike Koldychev (mkoldy=
ch) &lt;<a href=3D=22mailto:mkoldych=40cisco.com=22 target=3D=22=5Fblank=22=
>mkoldych=40cisco.com</a>&gt; wrote:</p>
</div>
<blockquote style=3D=22margin: 5px 5px; padding-left: 10px; border-left: =
thin solid =233498db;=22 class=3D=22spark=5Fquote=22>
<p class=3D=22MsoNormal=22 style=3D=22mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto=22>Hi WG,<br />
<br />
As per SPRING WG, SR Policy may contain multiple Candidate Paths and each=
 Candidate Path may contain multiple Segment Lists. Existing SR standards=
 in PCEP allow only a single ERO (one Segment List) for the SR Path in a =
stateful PCEP message. There is a need to signal multiple Segment Lists i=
n PCEP for this as well as other load balancing use cases.<br />
<br />
See the link that describes this, as well as list possible ways to achiev=
e this. Please provide your feedback on the list or during the WG session=
.<br />
<br />
<a href=3D=22https://github.com/dhruvdhody-huawei/105/blob/master/multipl=
e=5FERO=5Fjl03a.pdf=22 target=3D=22=5Fblank=22>https://github.com/dhruvdh=
ody-huawei/105/blob/master/multiple=5FERO=5Fjl03a.pdf</a><br />
<br />
Thanks,<br />
Mike.<br />
<br />
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F<br />
Pce mailing list<br />
<a href=3D=22mailto:Pce=40ietf.org=22 target=3D=22=5Fblank=22>Pce=40ietf.=
org</a><br />
<a href=3D=22https://www.ietf.org/mailman/listinfo/pce=22 target=3D=22=5F=
blank=22>https://www.ietf.org/mailman/listinfo/pce</a></p>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
</div>
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From: "Stone, Andrew (Nokia - CA/Ottawa)" <andrew.stone@nokia.com>
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Thread-Topic: [Pce] Proposal for signaling ECMP or UCMP paths
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Archived-At: <https://mailarchive.ietf.org/arch/msg/pce/qxv7JEwIUYfqjqKPb1YWV_dkthE>
Subject: Re: [Pce] Proposal for signaling ECMP or UCMP paths
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--_000_4E6C7616A794434B9171742FFD43E73Cnokiacom_--


From nobody Mon Jul 29 03:10:12 2019
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Subject: [Pce] [Technical Errata Reported] RFC8231 (5796)
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The following errata report has been submitted for RFC8231,
"Path Computation Element Communication Protocol (PCEP) Extensions for Stateful PCE".

--------------------------------------
You may review the report below and at:
https://www.rfc-editor.org/errata/eid5796

--------------------------------------
Type: Technical
Reported by: Hillol <chillol@juniper.net>

Section: 7.3.3

Original Text
-------------
               Value      Description
               -----      -------------------------------------
                 1        Unknown reason
                 2        Limit reached for PCE-controlled LSPs
                 3        Too many pending LSP Update Requests
                 4        Unacceptable parameters
                 5        Internal error
                 6        LSP administratively brought down
                 7        LSP preempted
                 8        RSVP signaling error

Corrected Text
--------------
Remove Value 2
 2        Limit reached for PCE-controlled LSPs

Notes
-----
Value 2 "Limit reached for PCE-controlled LSPs" can occur when an PC update message comes for either PCInitiated or PCDelegated LSP. But since the lsp is already created or delegated, it means the resource is available and allocated. Also RFC 8281 (section 5.3) states that if LSP provisioned exceeds the limit, an LSP error message should be sent with Error-type=19 (Invalid Operation) and
Error-value=6 (PCE-initiated LSP limit reached). So, I believe there is no scenario where LSP Error code TLV "Limit reached for PCE-controlled LSPs" would be used.
Please let me know if there is some scenario which can trigger the same.

Instructions:
-------------
This erratum is currently posted as "Reported". If necessary, please
use "Reply All" to discuss whether it should be verified or
rejected. When a decision is reached, the verifying party  
can log in to change the status and edit the report, if necessary. 

--------------------------------------
RFC8231 (draft-ietf-pce-stateful-pce-21)
--------------------------------------
Title               : Path Computation Element Communication Protocol (PCEP) Extensions for Stateful PCE
Publication Date    : September 2017
Author(s)           : E. Crabbe, I. Minei, J. Medved, R. Varga
Category            : PROPOSED STANDARD
Source              : Path Computation Element
Area                : Routing
Stream              : IETF
Verifying Party     : IESG


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Subject: Re: [Pce] Rtgdir last call review of draft-ietf-pce-stateful-path-protection-07
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