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Subject: [Pce] I-D Action: draft-ietf-pce-hierarchy-extensions-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           : Extensions to Path Computation Element Communication Protocol (PCEP) for Hierarchical Path Computation Elements (PCE)
        Authors         : Fatai Zhang
                          Quintin Zhao
                          Oscar Gonzalez de Dios
                          R. Casellas
                          Daniel King
	Filename        : draft-ietf-pce-hierarchy-extensions-11.txt
	Pages           : 31
	Date            : 2019-06-01

Abstract:
   The Hierarchical Path Computation Element (H-PCE) architecture is
   defined in RFC 6805.  It provides a mechanism to derive an optimum
   end-to-end path in a multi-domain environment by using a hierarchical
   relationship between domains to select the optimum sequence of
   domains and optimum paths across those domains.

   This document defines extensions to the Path Computation Element
   Protocol (PCEP) to support Hierarchical PCE procedures.



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

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

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

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


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Subject: Re: [Pce] New Version Notification for draft-ietf-pce-hierarchy-extensions-11.txt
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Hi PCE'rs,

Please find an updated version of draft-ietf-pce-hierarchy-extensions =
(now version 11). This version addressed various comments, NITs and =
readability improvements made by the IESG and review team reviews. =20

Thanks!
BR Dan, and the other draft-ietf-pce-hierarchy-extensions authors.=20

-----Original Message-----
From: internet-drafts@ietf.org <internet-drafts@ietf.org>=20
Sent: 01 June 2019 18:28
To: Daniel King <daniel@olddog.co.uk>; Oscar Gonzalez de Dios =
<oscar.gonzalezdedios@telefonica.com>; Fatai Zhang =
<zhangfatai@huawei.com>; Oscar de Dios =
<oscar.gonzalezdedios@telefonica.com>; Quintin Zhao =
<quintin.zhao@huawei.com>; pce-chairs@ietf.org
Subject: New Version Notification for =
draft-ietf-pce-hierarchy-extensions-11.txt


A new version of I-D, draft-ietf-pce-hierarchy-extensions-11.txt
has been successfully submitted by Daniel King and posted to the
IETF repository.

Name:		draft-ietf-pce-hierarchy-extensions
Revision:	11
Title:		Extensions to Path Computation Element Communication Protocol =
(PCEP) for Hierarchical Path Computation Elements (PCE)
Document date:	2019-06-01
Group:		pce
Pages:		31
URL:            =
https://www.ietf.org/internet-drafts/draft-ietf-pce-hierarchy-extensions-=
11.txt
Status:         =
https://datatracker.ietf.org/doc/draft-ietf-pce-hierarchy-extensions/
Htmlized:       =
https://tools.ietf.org/html/draft-ietf-pce-hierarchy-extensions-11
Htmlized:       =
https://datatracker.ietf.org/doc/html/draft-ietf-pce-hierarchy-extensions=

Diff:           =
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-pce-hierarchy-extensions-1=
1

Abstract:
   The Hierarchical Path Computation Element (H-PCE) architecture is
   defined in RFC 6805.  It provides a mechanism to derive an optimum
   end-to-end path in a multi-domain environment by using a hierarchical
   relationship between domains to select the optimum sequence of
   domains and optimum paths across those domains.

   This document defines extensions to the Path Computation Element
   Protocol (PCEP) to support Hierarchical PCE procedures.


                                                                         =
        =20


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



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References: <058701d517c5$15653c90$402fb5b0$@olddog.co.uk> <E0C26CAA2504C84093A49B2CAC3261A43B7E5084@dggeml511-mbx.china.huawei.com>
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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Mon, 3 Jun 2019 10:57:50 +0530
Message-ID: <CAB75xn44qYLS_QHfE5=gUkdOY2Qka0tLGgx4asuVqe8kjH2keQ@mail.gmail.com>
To: "Zhenghaomian (Zhenghaomian, Optical Technology Research Dept)" <zhenghaomian@huawei.com>
Cc: "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "pce@ietf.org" <pce@ietf.org>
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Subject: Re: [Pce] =?utf-8?b?562U5aSNOiBQQ0VQIEVuaGFuY2VkIEVycm9ycw==?=
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Hi Haomian,

Lets come up with the guidelines (and get the agreement on the mailing
list) first!
Then, lets take one of the I-D as example and work with the authors to
incorporate the guidelines.

We can worry about how to add guidelines to the wiki later. We can
also add the guidelines in your draft itself.

Thanks!
Dhruv


On Mon, Jun 3, 2019 at 7:20 AM Zhenghaomian (Zhenghaomian, Optical
Technology Research Dept) <zhenghaomian@huawei.com> wrote:
>
> Hi, Adrian, WGs,
>
> Thank you for bringing the issue to the list, I think we agreed the direc=
tion you mentioned 'no haste but keep moving' in Prague. We would definitel=
y like to provide some text as guideline for other documents, either in the=
 draft or on the wiki page, or both. Personally I need to understand the co=
ntext in the wiki page before doing that. Do the chairs want to see a separ=
ate paragraph talking about the error handling? Or we put the text together=
 with other sections like 'implement policy'?
>
> We can move on providing text once we can agree on how to manage, thank y=
ou.
>
> Best wishes,
> Haomian (as one of the co-authors)
>
> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> =E5=8F=91=E4=BB=B6=E4=BA=BA: Pce [mailto:pce-bounces@ietf.org] =E4=BB=A3=
=E8=A1=A8 Adrian Farrel
> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B45=E6=9C=8831=E6=97=A5 =
23:25
> =E6=94=B6=E4=BB=B6=E4=BA=BA: pce@ietf.org
> =E4=B8=BB=E9=A2=98: [Pce] PCEP Enhanced Errors
>
> Hi,
>
> In Prague we had a discussion of draft-ietf-pce-enhanced-errors.
>
> My recollection is that we decided that there was no great hurry to push =
this document to completion, but that we didn't want to abandon it.
>
> Checking back with the minutes, there was an objective that we encourage =
authors of other documents to adhere to the error behaviours described in t=
his document. We do this possibly by putting text on a wiki page, but first=
 by discussing the guidelines on the mailing list. Looks like we were parti=
cularly interested in the behaviours when there are multiple PCEs present.
>
> We also discussed the possibilities for encouraging an "Error Handling"
> section in all our drafts, or at least for a section on "Error Handling i=
n Multi-PCE Scenarios" when applicable.
>
> Would the authors of draft-ietf-pce-enhanced-errors like to take the lead=
 on this?
>
> Thanks,
> Adrian
>
> _______________________________________________
> 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 Jun  3 13:04:05 2019
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Cc: dhruv.ietf@gmail.com, The IESG <iesg@ietf.org>, db3546@att.com, Dhruv Dhody <dhruv.ietf@gmail.com>, draft-ietf-pce-hierarchy-extensions@ietf.org, pce@ietf.org, pce-chairs@ietf.org, rfc-editor@rfc-editor.org
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Subject: [Pce] Protocol Action: 'Extensions to Path Computation Element Communication Protocol (PCEP) for Hierarchical Path Computation Elements (PCE)' to Proposed Standard (draft-ietf-pce-hierarchy-extensions-11.txt)
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The IESG has approved the following document:
- 'Extensions to Path Computation Element Communication Protocol (PCEP)
   for Hierarchical Path Computation Elements (PCE)'
  (draft-ietf-pce-hierarchy-extensions-11.txt) as Proposed Standard

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

The IESG contact persons are Alvaro Retana, Martin Vigoureux and Deborah
Brungard.

A URL of this Internet Draft is:
https://datatracker.ietf.org/doc/draft-ietf-pce-hierarchy-extensions/





Technical Summary

The Hierarchical Path Computation Element (H-PCE) architecture is
defined in RFC 6805.  It provides a mechanism to derive an optimum
end-to-end path in a multi-domain environment by using a hierarchical
relationship between domains to select the optimum sequence of
domains and optimum paths across those domains. This document defines 
extensions to the Path Computation Element Protocol (PCEP) to support
Hierarchical PCE procedures.

Working Group Summary

No controversies. The document was initially marked experimental and after
discussion within the WG it was moved to proposed standards. The consensus 
behind the document is good and it is bases for further H-PCE related work
such as stateful H-PCE and ACTN.

Document Quality

There are several PCEP implementations supporting H-PCE. This 
includes commercial as well as open source implementations. 
This information can be found in the appendix.

Personnel

   Who is the Document Shepherd for this document?  Dhruv Dhody 
   Who is the Responsible Area Director? Deborah Brungard


From nobody Mon Jun  3 21:18:25 2019
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From: Qin Wu <bill.wu@huawei.com>
To: "pce@ietf.org" <pce@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: Solicit feeback on draft-ietf-lsr-pce-discovery-security-support-01
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Hi, Folks:
Draft-ietf-lsr-pce-discovery-security-support was adopted by LSR WG in Dece=
mber 2018 due to security importance for routing protocol.
Julien shared his comments and also help look for comments and feedback fro=
m PCE WG on this draft during poll adoption call in LSR WG.
Recently we made a quick update to draft-ietf-lsr-pce-discovery-security-su=
pport without technical content changes.
We would like to solicit comments and feedback again on this draft. Thanks =
in advance!

-Qin
> -----Original Message-----
> From: Lsr <lsr-bounces@ietf.org> On Behalf Of internet-drafts@ietf.org
> Sent: Sunday, June 02, 2019 8:45 PM
> To: i-d-announce@ietf.org
> Cc: lsr@ietf.org
> Subject: [Lsr] I-D Action:=20
> draft-ietf-lsr-pce-discovery-security-support-01.txt
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts direct=
ories.
> This draft is a work item of the Link State Routing WG of the IETF.
>=20
>         Title           : IGP extension for PCEP security capability supp=
ort in the PCE
> discovery
>         Authors         : Diego R. Lopez
>                           Qin Wu
>                           Dhruv Dhody
>                           Michael Wang
>                           Daniel King
> 	Filename        : draft-ietf-lsr-pce-discovery-security-support-01.txt
> 	Pages           : 10
> 	Date            : 2019-06-02
>=20
> Abstract:
>    When a Path Computation Element (PCE) is a Label Switching Router
>    (LSR) participating in the Interior Gateway Protocol (IGP), or even a
>    server participating in IGP, its presence and path computation
>    capabilities can be advertised using IGP flooding.  The IGP
>    extensions for PCE discovery (RFC 5088 and RFC 5089) define a method
>    to advertise path computation capabilities using IGP flooding for
>    OSPF and IS-IS respectively.  However these specifications lack a
>    method to advertise PCEP security (e.g., Transport Layer
>    Security(TLS), TCP Authentication Option (TCP-AO)) support
>    capability.
>=20
>    This document proposes new capability flag bits for PCE-CAP-FLAGS
>    sub-TLV that can be announced as attribute in the IGP advertisement
>    to distribute PCEP security support information.  In addition, this
>    document updates RFC 5088 and RFC 5089 to allow advertisement of Key
>    ID or Key Chain Name Sub-TLV to support TCP AO security capability.
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-lsr-pce-discovery-security
> -
> support/
>=20
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-lsr-pce-discovery-security-supp
> ort-01
> https://datatracker.ietf.org/doc/html/draft-ietf-lsr-pce-discovery-sec
> urity-
> support-01
>=20
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-lsr-pce-discovery-securit
> y-
> support-01
>=20
>=20
> Please note that it may take a couple of minutes from the time of=20
> submission until the htmlized version and diff are available at tools.iet=
f.org.
>=20
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr


From nobody Tue Jun  4 03:39:28 2019
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Subject: [Pce] I-D Action: draft-ietf-pce-lsp-control-request-04.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           : Ability for a stateful Path Computation Element (PCE) to request and obtain control of a LSP
        Authors         : Aswatnarayan Raghuram
                          Al Goddard
                          Chaitanya Yadlapalli
                          Jay Karthik
                          Siva Sivabalan
                          Jon Parker
                          Mahendra Singh Negi
	Filename        : draft-ietf-pce-lsp-control-request-04.txt
	Pages           : 11
	Date            : 2019-06-04

Abstract:
   The stateful Path Computation Element (PCE) communication Protocol
   (PCEP) extensions provide stateful control of Multiprotocol Label
   Switching (MPLS) Traffic Engineering Label Switched Paths (TE LSP)
   via PCEP, for a model where a Path Computation Client (PCC) delegates
   control over one or more locally configured LSPs to a stateful PCE.
   There are use-cases in which a stateful PCE may wish to request and
   obtain control of one or more LSPs from a PCC.  This document
   describes a simple extension to stateful PCEP to achieve such an
   objective.



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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-pce-lsp-control-request-04
https://datatracker.ietf.org/doc/html/draft-ietf-pce-lsp-control-request-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-lsp-control-request-04


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

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


From nobody Tue Jun  4 03:40:03 2019
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Subject: [Pce] I-D Action: draft-ietf-pce-association-diversity-07.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           : Path Computation Element communication Protocol (PCEP) extension for signaling LSP diversity constraint
        Authors         : Stephane Litkowski
                          Siva Sivabalan
                          Colby Barth
                          Mahendra Singh Negi
	Filename        : draft-ietf-pce-association-diversity-07.txt
	Pages           : 22
	Date            : 2019-06-04

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
   LSPs in the same group needs 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-07
https://datatracker.ietf.org/doc/html/draft-ietf-pce-association-diversity-07

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-association-diversity-07


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Subject: [Pce] I-D Action: draft-ietf-pce-stateful-path-protection-05.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 Associating Working and Protection LSPs with Stateful PCE
        Authors         : Hariharan Ananthakrishnan
                          Siva Sivabalan
                          Colby Barth
                          Raveendra Torvi
                          Ina Minei
                          Edward Crabbe
                          Mahendra Singh Negi
	Filename        : draft-ietf-pce-stateful-path-protection-05.txt
	Pages           : 16
	Date            : 2019-06-04

Abstract:
   A stateful Path Computation Element (PCE) is capable of computing as
   well as controlling via Path Computation Element Communication
   Protocol (PCEP) Multiprotocol Label Switching Traffic Engineering
   Label Switched Paths (MPLS LSP).  Furthermore, it is also possible
   for a stateful PCE to create, maintain, and delete LSPs.  This
   document describes PCEP extension to associate two or more LSPs to
   provide end-to-end path protection.


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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-pce-stateful-path-protection-05
https://datatracker.ietf.org/doc/html/draft-ietf-pce-stateful-path-protection-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-stateful-path-protection-05


Please note that it may take a couple of minutes from the time of submission
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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Tue, 4 Jun 2019 21:16:56 +0530
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Hi,

Thanks for making the update (-07). Just one more nit in the update -

https://tools.ietf.org/html/draft-ietf-pce-association-diversity-07

Section 4.1

   As per [I-D.ietf-pce-association-group], LSPs are associated with
   other LSPs with which they interact by adding them to a common
   association group.  The Association parameters, as described in
   [I-D.ietf-pce-association-group] as the combination of the mandatory
   fields Association type, Association ID and Association Source in the
   ASSOCIATION object, that uniquely identify the association group
   belonging to this association.

Not sure about "belonging to this association". I feel we should just stop at
"....that uniquely identify the association group."

Thanks,
Dhruv

On Thu, May 16, 2019 at 4:41 PM Dhruv Dhody <dhruv.ietf@gmail.com> wrote:
>
> Hi Authors,
>
> I did a chair's review of the I-D. Expect a separate shepherd review from
> Julien. A little effort needs to be made by the authors to make this I-D
> crisp.
>
> (1) Section 3, discussion related to SVEC feels incorrect inside a section
> called 'Motivation'. Lets create a new section (I made minor changes) -
>
> Relationship to SVEC
>
>    [RFC5440] defines a mechanism for the synchronization of a set of
>    path computation requests by using the SVEC (Synchronization VECtor)
>    object, that specifies the list of synchronized requests that can
>    either be dependent or independent.  The SVEC object identify the
>    relationship between the set of path computation requests, identified
>    by 'Request-ID-number' in RP (Request Parameters) object.  [RFC6007]
>    further clarified the use of the SVEC list for synchronized path
>    computations when computing dependent requests as well as described a
>    number of usage scenarios for SVEC lists within single-domain and
>    multi-domain environments.
>
>    The SVEC object includes a Flags field that indicates the potential
>    dependency between the set of path computation request in a similar
>    way as the Flags field in the TLVs defined in this document.  The
>    path computation request in the PCReq message MAY use both SVEC and
>    ASSOCIATION object to identify the related path computation request
>    as well as the diversity association group.  The PCE MUST try to find a
>    path that meets both the constraints.  It is possible that the
>    diversity requirement in the association group is different from the one
>    in SVEC object.  The PCE would consider both the objects as per the
>    processing rules and aim to find a path that meets both these constraints.
>    In case no such path is possible (or the constraints are incompatible),
>    the PCE MUST send a path computation reply (PCRep) with NO-PATH object
>    indicating path computation failure as per [RFC5440].
>
> (2) Section 3, I am not sure about this -
>
>    Using the disjoint-group within a PCEP messages may have two purpose:
>
>    o  Information: in case the PCE is performing the path computation,
>       it may communicate to the PCC the disjoint parameters.
>
>    o  Configuration: in case the PCC are configured with disjoint
>       requirements, these are communicated to the PCE.
>
> This feels incomplete as it singles out information from PCE to PCC and
> configuration at PCC. Maybe better to re-word along our TLVs - where the
> disjoint status is included by PCE but configuration is included by both.
>
> (3) Section 4.1,
>    But a PCE may be limited
>    in how many LSPs it can take into account when computing
>    disjointness.  If a PCE receives more LSPs in the group than it can
>    handle in its computation algorithm, it SHOULD apply disjointness
>    computation to only a subset of LSPs in the group.  The subset of
>    disjoint LSPs will be decided by PCE as a local matter.
>
> You then say
>
>    Local polices on the PCC or PCE MAY define the computational behavior
>    for the other LSPs in the group.  For example, the PCE may provide no
>    path, a shortest path, or a constrained path based on relaxing
>    disjointness, etc.
>
> Better to merge the above with the previous paragraph and also include some
> text on the disjoint status information.
>
> (4) Section 4.2,
>
>       *  P (Shortest path) bit: when set, this indicates that the
>          computed path of the LSP SHOULD satisfies all constraints and
>          objective functions first without considering the diversity
>          constraint.  This means that an LSP with P flag set should be
>          placed as if the disjointness constraint has not been
>          configured, while the other LSP in the association with P flag
>          unset should be placed by taking into account the disjointness
>          constraint.  Setting P flag changes the relationship between
>          LSPs to a unidirectional relationship (LSP 1 with P=0 depends
>          of LSP 2 with P=1, but LSP 2 with P=1 does not depend of LSP 1
>          with P=0).
>
> Instead of unidirectional, maybe one-sided relationship?
>
> It will be better to include this text from section 4.4 here instead -
>
>    Multiple LSPs in the same disjoint group may have the P-flag set.  In
>    such a case, those LSPs may not be disjoint from each other but will
>    be disjoint from others LSPs in the group that have the P-flag unset.
>
> Also, add "Unassigned bits MUST be set to 0 on transmission and MUST be
> ignored on receipt."
>
> (5) Section 4.2, are all flags valid in DISJOINTNESS-STATUS-TLV? What does 'P'
> and 'T' mean here?
>
> (6) Section 4.3, it would be good to limit the OF-Codes allowed inside the
> disjoint association to the new OF code defined in this document. Add an error
> in case some other OF code is used.
>
> (7) Section 4.4, we should remove 'both' as we lack this in PCEP-SR right now.
>
>    An implementation may choose one
>    of the paths or even use both (using both may happen in case Segment
>    Routing TE is used, allowing ECMP).
>
> (8) Why 'MAY' in -
>
>    When P-flag is set for an LSP and when ECMPs are available, an
>    implementation MAY select a path that allows disjointness.
>
> It should be MUST or SHOULD.
> Can you do a check on RFC2119 keywords through out the I-D?
>
> (9) The IANA considerations section needs some more work. The request to
> IANA are not spelled out clearly, please review this section.
>
> (10) The manageability considerations needs some meat. Top of my head -
> reference to Yang, Operator configured range for disjoint group, number of
> LSPs inside an association group etc.
>
> Nits
> ----
> - Expand on 1st use - PCRpt, PCUpd, PCInitiate, PLSP-ID...
>
> - Section 1,
> OLD
>    [I-D.ietf-pce-association-group] introduces a generic mechanism to
>    create a grouping of LSPs which can then be used to define
>    associations between a set of LSPs and a set of attributes (such as
>    configuration parameters or behaviors) and is equally applicable to
>    the active and passive modes of a stateful PCE [RFC8231] or a
>    stateless PCE [RFC5440].
> NEW
>    [I-D.ietf-pce-association-group] introduces a generic mechanism to
>    create a grouping of LSPs in the context of a PCE which can then be
>    used to define associations between a set of LSPs or between a set of
>    LSPs and a set of attributes (such as configuration parameters or
>    behaviour), and is equally applicable to the stateful PCE [RFC8231]
>    (active and passive modes) as well as the stateless PCE [RFC5440].
> END
>
> -Section 2, the term LSR is not used. We could expand this section to point
> to some other useful terms, just by adding reference to where they are
> defined.
>
> - Section 4.1
> OLD:
>    The Association parameters, as described in
>    [I-D.ietf-pce-association-group] as the combination of the mandatory
>    fields Association type, Association ID and Association Source in the
>    ASSOCIATION object, that uniquely identify the association group,
>    uniquely identify the disjoint group.
> NEW:
>    The Association parameters (as described in
>    [I-D.ietf-pce-association-group]) is the combination of the mandatory
>    fields Association type, Association ID and Association Source in the
>    ASSOCIATION object, that uniquely identify the association group.
> END
> s/to uniquely identifying/to uniquely identify/
> s/belonging to this associations/belonging to this association/
> s/insurance/assurance/
>
> - Section 4.2
> s/relaxing disjointness constraint at all
>  /relaxing disjointness constraint fully/
> add OF-List TLV (as per Section 4.3) into the list of TLVs
>
> -Section 4.4
> In figure 3, it would be good to say the cost of other links is 1?
> s/allowed to be longer/allowed to be costlier/
> What is RTD? Is it round trip delay? Better to use Path delay metric as per
> RFC8233 .
> OLD:
>    Driving the PCE disjointness computation may be done in other ways by
>    for instance setting a metric boundary reflecting an RTD boundary.
> NEW:
>    Driving the PCE disjointness computation may be done in other ways,
>    for instance by setting a path delay metric boundary.
> END
>
> -Section 4.5
> OLD:
>    All LSPs in a particular disjoint group MUST use the same combination
>    of T,S,N,L flags in the DISJOINTNESS-CONFIGURATION-TLV.  If a PCE
>    receives PCRpt messages for LSPs belonging to the same disjoint group
>    but having an inconsistent combination of T,S,N,L flags, the PCE
>    SHOULD NOT try to compute disjointness path and SHOULD reply a PCErr
>    with Error-type 26 (Association Error) and Error-Value 6 (Association
>    information mismatch) to all PCCs involved in the disjoint group.
> NEW:
>    All LSPs in a particular disjoint group MUST use the same combination
>    of T,S,N,L flags in the DISJOINTNESS-CONFIGURATION-TLV.  If a PCEP peer
>    receives a PCEP message for LSPs belonging to the same disjoint group
>    but having an inconsistent combination of T,S,N,L flags, the PCEP peer
>    SHOULD NOT try to add the LSP in the disjoint group and SHOULD reply with
>    a PCErr with Error-type 26 (Association Error) and Error-Value 6 (Association
>    information mismatch).
> END
> The change is suggested to make this more generic and not just for the PCRpt
> message.
>
> - Section 6, use [This.I-D]
>
> Thanks!
> Dhruv


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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Tue, 4 Jun 2019 21:20:24 +0530
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Subject: Re: [Pce] Chair review of draft-ietf-pce-stateful-path-protection
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Hi Mahendra,

Thanks for making the update (-05). I see a few non-blocking issues that can
handled later.

https://tools.ietf.org/html/draft-ietf-pce-stateful-path-protection-05

(1) You added -

   [RFC8051] describes
   applicability of Path protection in PCE deployment.

I suggest change this to -

   [RFC8051] describes
   applicability of path protection for stateful PCE deployments.

(2) Add a space between "Report" and "(" in "Report(PCRpt) message", similarly
for "Report(PCRpt) message" and "Initiate(PCInitiate) message"

(3) Number of authors is still an issue that needs to be handled, either by
reducing the number of co-authors or providing a justification. Please do so
before we ship this out of the WG.

Thanks for handling my other comments.

Thanks,
Dhruv

On Thu, May 16, 2019 at 4:41 PM Dhruv Dhody <dhruv.ietf@gmail.com> wrote:
>
> Hi Authors,
>
> I did a chair's review of the I-D. Expect a separate shepherd review from
> Julien. I found minor issues that can be easily fixed.
>
> (1) The issue with number of authors on the front page is bound to come up,
> either provide valid justification to your shepherd or reduce to 5.
>
> (2) Add reference to RFC8051 in introduction, which had a section on
> protection.
>
> (3) It would be good to explicitly state that in PCE-initiated LSPs case, the
> association group is created by PCE.
>
> (4) Section 4.1.
>
> OLD:
>    During state synchronization, a PCC MUST report all the existing path
>    protection association groups as well as any path protection flags to
>    PCE(s) as per [I-D.ietf-pce-association-group].
> NEW:
>    During state synchronization, a PCC report all the existing LSP state as
>    described in [RFC8231], the the association group membership pertaining to
>    a LSP is also reported as per [I-D.ietf-pce-association-group]. This
>    includes PPAG.
> END
>
> Nits
> ----
> s/Path Computation Element Protocol (PCEP)/Path Computation Element
>  communication Protocol (PCEP)/
> s/between one a pair of PCEs/between a pair of PCEs/
> s/Stateful pce/Stateful PCE/
> s/Path Protection Association Object Type/Path Protection Association Type/
> s/[A|a]ssociation-type/Association type/
> Section 4.4, extra "." at the end.
> Section 4.5, closing braces missing, end of 2nd paragraph.
> Expand on 1st use - PCRpt, PCUpd, PCInitiate...
>
> Regards,
> Dhruv


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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Tue, 4 Jun 2019 21:24:35 +0530
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Subject: Re: [Pce] WG LC prep for draft-ietf-pce-lsp-control-request
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Hi,

Thanks for the posting the update (-04) with the Implementation Status.

https://tools.ietf.org/html/draft-ietf-pce-lsp-control-request-04#section-5

I see the number of co-authors is not resolved, but that's okay, just do so
before we ship the document out of the WG.

We will start the WG LC and IPR poll shortly.

Thanks,
Dhruv

On Fri, May 17, 2019 at 3:24 PM Dhruv Dhody <dhruv.ietf@gmail.com> wrote:
>
> Hi Authors,
>
> In preparation for WG LC for this I-D, please update the document to
> include the 'Implementation Status' Section as per the new
> implementation policy [1].
>
> You also have 7 authors, we usually limit to 5 on front page and rest
> as contributors [2].
>
> Hari is assigned as the document shepherd for this I-D.
>
> There are no IPR declared on this I-D. We will start the IPR poll
> along with WGLC to reconfirm.
>
> Please feel free to reach out if you have any questions/concerns.
>
> --
>
> Hi WG,
>
> You don't have to wait for the official WGLC, add this I-D in your
> review queue and please provide comments!
>
> Thanks!
> Dhruv, Julien & Adrian
>
> [1] "All WG I-Ds are required to include an 'Implementation Status'
> Section (as per RFC7942) to document known existing or planned
> implementations. The chairs can make exceptions on a per-document
> basis."
> [2] https://tools.ietf.org/html/rfc7322#section-4.1.1


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Date: Tue, 4 Jun 2019 21:56:02 +0530
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Subject: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04
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Hi WG,

This email starts a working group last call for
draft-ietf-pce-lsp-control-request-04. The WG LC will run for 2 weeks, till
19th June 2019.

https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-control-request/

Please indicate your support or concern for this draft.

If you are opposed to the progression of the draft, please articulate your
concern.

If you support, please indicate that you have read the latest version and
it is ready for publication. Further, explaining the importance of the work in
your opinion is appreciated.

As always, review comments and nits are most welcome. Silence on the list, not
so much :)

Thanks,
Dhruv, Julien, & Adrian


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From: Hariharan Ananthakrishnan <hari@netflix.com>
Date: Tue, 4 Jun 2019 17:56:17 -0700
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To: ar2521@att.com, ag6941@att.com, cy098d@att.com, jakarthi@cisco.com,  msiva@cisco.com, jdparker@cisco.com, mahendrasingh@huawei.com
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Subject: [Pce] IPR poll on draft-ietf-pce-lsp-control-request-04
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Hi Authors,

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

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

--0000000000003e5dd7058a891195
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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_5789933747195254190gmail-=
wordwrap" style=3D"white-space:pre-wrap;box-sizing:border-box;margin-top:0p=
x;margin-bottom:1rem;overflow:auto;color:rgb(33,37,41);word-break:normal;pa=
dding:0px"><font face=3D"verdana, sans-serif">Hi Authors,

In preparation for Working Group last call 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.

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>

--0000000000003e5dd7058a891195--


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From: Jeff Tantsura <jefftant.ietf@gmail.com>
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Subject: Re: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04
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Yes/support

Regards,
Jeff

> On Jun 4, 2019, at 20:26, Dhruv Dhody <dhruv.ietf@gmail.com> wrote:
>=20
> Hi WG,
>=20
> This email starts a working group last call for
> draft-ietf-pce-lsp-control-request-04. The WG LC will run for 2 weeks, til=
l
> 19th June 2019.
>=20
> https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-control-request/
>=20
> Please indicate your support or concern for this draft.
>=20
> If you are opposed to the progression of the draft, please articulate your=

> concern.
>=20
> If you support, please indicate that you have read the latest version and
> it is ready for publication. Further, explaining the importance of the wor=
k in
> your opinion is appreciated.
>=20
> As always, review comments and nits are most welcome. Silence on the list,=
 not
> so much :)
>=20
> Thanks,
> Dhruv, Julien, & Adrian
>=20
> _______________________________________________
> Pce mailing list
> Pce@ietf.org
> https://www.ietf.org/mailman/listinfo/pce


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Mirja Kühlewind has entered the following ballot position for
draft-ietf-pce-inter-area-as-applicability-07: Abstain

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

I only had a quick read of this document, however, the actual value of
archiving this document in the RFC series is not clear to me. This document
rather seems to a be high-level summary of various other RFCs than an
applicability statement.

Also the shepherd write-up indicates that there was very little review of this
document which seems also concerning.



From nobody Thu Jun  6 00:03:01 2019
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From: Satish K <satish.ietf@gmail.com>
Date: Thu, 6 Jun 2019 12:32:45 +0530
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Yes / Support.

Regards,
Satish.

On Tue, Jun 4, 2019 at 9:56 PM Dhruv Dhody <dhruv.ietf@gmail.com> wrote:

> Hi WG,
>
> This email starts a working group last call for
> draft-ietf-pce-lsp-control-request-04. The WG LC will run for 2 weeks, till
> 19th June 2019.
>
> https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-control-request/
>
> Please indicate your support or concern for this draft.
>
> If you are opposed to the progression of the draft, please articulate your
> concern.
>
> If you support, please indicate that you have read the latest version and
> it is ready for publication. Further, explaining the importance of the
> work in
> your opinion is appreciated.
>
> As always, review comments and nits are most welcome. Silence on the list,
> not
> so much :)
>
> Thanks,
> Dhruv, Julien, & Adrian
>
> _______________________________________________
> Pce mailing list
> Pce@ietf.org
> https://www.ietf.org/mailman/listinfo/pce
>

--000000000000b74633058aa24d37
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Yes / Support.</div><div><br></div><div>Regards,<br><=
/div><div>Satish.<br></div></div><br><div class=3D"gmail_quote"><div dir=3D=
"ltr" class=3D"gmail_attr">On Tue, Jun 4, 2019 at 9:56 PM Dhruv Dhody &lt;<=
a href=3D"mailto:dhruv.ietf@gmail.com">dhruv.ietf@gmail.com</a>&gt; wrote:<=
br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi WG,<br>
<br>
This email starts a working group last call for<br>
draft-ietf-pce-lsp-control-request-04. The WG LC will run for 2 weeks, till=
<br>
19th June 2019.<br>
<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-control-requ=
est/" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/doc=
/draft-ietf-pce-lsp-control-request/</a><br>
<br>
Please indicate your support or concern for this draft.<br>
<br>
If you are opposed to the progression of the draft, please articulate your<=
br>
concern.<br>
<br>
If you support, please indicate that you have read the latest version and<b=
r>
it is ready for publication. Further, explaining the importance of the work=
 in<br>
your opinion is appreciated.<br>
<br>
As always, review comments and nits are most welcome. Silence on the list, =
not<br>
so much :)<br>
<br>
Thanks,<br>
Dhruv, Julien, &amp; Adrian<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>

--000000000000b74633058aa24d37--


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From: "Siva Sivabalan (msiva)" <msiva@cisco.com>
To: Dhruv Dhody <dhruv.ietf@gmail.com>, "pce@ietf.org" <pce@ietf.org>
CC: Hariharan Ananthakrishnan <hari@netflix.com>, "draft-ietf-pce-lsp-control-request@ietf.org" <draft-ietf-pce-lsp-control-request@ietf.org>
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From nobody Thu Jun  6 09:15:05 2019
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From: <julien.meuric@orange.com>
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To: "draft-ietf-pce-stateful-path-protection@ietf.org" <draft-ietf-pce-stateful-path-protection@ietf.org>
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Subject: [Pce] Shepherd Review of draft-ietf-pce-stateful-path-protection-05
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Hi authors of draft-ietf-pce-stateful-path-protection,

Thank you for the update following Dhruv's comments.

To summarize, I mainly have 2 issues to point out:
- The I-D depends on RFC 4872 and reuses the P, S and PT flags (which is
great); however, the side effect of redefining (why?) the expansion of
the S bit (Standby vs. Secondary) leads to a common behavior with an
opposite flag value between the specifications! As suggested by the
reference in section 3.2., we expect alignment here.
- In sections 4.5 and 6.3, the Error-Type for associations has shifted
from 26 (early allocated by IANA) to 29 (from nowhere); this mistake
makes me wonder about the implementation status of the I-D.

Then, looking at the details.
------
Header
---
- As pointed out by Dhruv, we still miss a valid justification for the 7
names listed on the front page, all the more as you exceed the
recommended threshold by 2.
------
Abstract
---
- s/A stateful Path Computation Element/An active stateful Path
Computation Element/
- s/for a stateful PCE/for an active stateful PCE/
------
1. Introduction
---
- s/the PCE Initiated mode/the PCE-Initiated mode/
------
3. PCEP Extensions
---
- s/[I-D.ietf-pce-association-group]
specify/[I-D.ietf-pce-association-group] specifies/
- s/The length field is 16 bit-long and has/The length field (16 bits) has/
- s/Following flags are currently defined -/The following flags are
currently defined:/
- s/Following values are/The following values are/
- s/i.e. P bit is unset/i.e. as if P bit is unset/
------
4. Operation
---
- s/[RFC8231], the the association group/[RFC8231]. The association group/
- s/to a LSP/to an LSP/
- s/includes PPAG./includes PPAGs./
- s/PCC Initiated/PCC-Initiated/
- s/remove on or more/remove one or more/
- s/PCC would report/PCC reports/
- s/via Path Computation Report(PCRpt) message/via the Path Computation
Report (PCRpt) message/
- s/LSPs to a stateful PCE/LSPs to an active PCE/
- s/where PCE would/where the PCE would/
- s/via Path Computation Update(PCUpd) message/via the Path Computation
Update (PCUpd) message/
- s/to PCC via PCUpd message/to the PCC via the PCUpd message/
- s/refer [I-D.litkowski-pce-state-sync]/refer to
[I-D.litkowski-pce-state-sync]/
- s/PCE Initiated LSPs/PCE-Initiated LSPs/
- s/both the PCE and PCC/both the PCE and the PCC/
- s/uses PCUpd or Path Computation Initiate(PCInitiate) message/uses the
PCUpd or the Path Computation Initiate (PCInitiate) messages/
- s/at PCC/at the PCC/
- s/Same procedure/The same procedure/
- s/with Error-Type= 29/with Error-Type 26/
- s/and Error-Value = TBD3/and Error-Value TBD3/
- s/1:N (with N=1),/1:N with N=1,/
- s/and protection LSP/and one protection LSP
- s/a PCEP Speaker/a PCEP speaker/
- s/with Error-Type=29/with Error-Type 26/
- s/and Error-Value = TBD4/and Error-Value TBD4/
- s/continue to apply/continues to apply/
------
5. Other considerations
---
- s/Other considerations/Other Considerations/
- s/LSPs.The/LSPs. The/
- s/for the the protection LSP/for the protection LSP/
- s/both ASSOCIATION object/both ASSOCIATION objects/
- s/and disjoint association/and the disjoint association/
------
6. IANA considerations
---
- s/IANA considerations/IANA Considerations/
- s/Action [RFC8126]. Each bit should be tracked with the following
qualities:/Action [RFC8126]./  [The sentence appears twice.]
- s/new Error-Type and Error-Value/new Error-Value/
- The table in section 6.3 is confusing. A way to clarify would be to
say: "allocate new error values for Error-Type 26 within [...]" and
change the 1st column into "Error-Value".
------


Cheers,

Julien


_________________________________________________________________________________________________________________________

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From nobody Thu Jun  6 11:55:41 2019
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Subject: [Pce] I-D Action: draft-ietf-pce-stateful-hpce-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           : Hierarchical Stateful Path Computation Element (PCE).
        Authors         : Dhruv Dhody
                          Young Lee
                          Daniele Ceccarelli
                          Jongyoon Shin
                          Daniel King
                          Oscar Gonzalez de Dios
	Filename        : draft-ietf-pce-stateful-hpce-08.txt
	Pages           : 22
	Date            : 2019-06-06

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).
   Initialize the result of path computation from PCE is also 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-08
https://datatracker.ietf.org/doc/html/draft-ietf-pce-stateful-hpce-08

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


From nobody Thu Jun  6 12:01:24 2019
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Subject: Re: [Pce] I-D Action: draft-ietf-pce-stateful-hpce-08.txt
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Dear PCE Working Group, 

Please find an updated version of draft-ietf-pce-stateful-hpce. Updates to
the I-D include:

- Clarification of stateful deployment scenarios and use cases
- Terminology clean-up
- Reference clean-up and proper assignment into normative and informative
- Cleaner procedure numbering  

This version also addresses review comments from Hoamian and Adrian, I will
follow-up specifically in separate emails later. 

BR, Dan and the draft-ietf-pce-stateful-hpce authors. 

-----Original Message-----
From: I-D-Announce <i-d-announce-bounces@ietf.org> On Behalf Of
internet-drafts@ietf.org
Sent: 06 June 2019 19:56
To: i-d-announce@ietf.org
Cc: pce@ietf.org
Subject: I-D Action: draft-ietf-pce-stateful-hpce-08.txt


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
                          Oscar Gonzalez de Dios
	Filename        : draft-ietf-pce-stateful-hpce-08.txt
	Pages           : 22
	Date            : 2019-06-06

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).
   Initialize the result of path computation from PCE is also 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-08
https://datatracker.ietf.org/doc/html/draft-ietf-pce-stateful-hpce-08

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-stateful-hpce-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: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Fri, 7 Jun 2019 16:45:43 +0530
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Hi Haomian, WG,

Note that, this guideline should be for any 'future' draft, since this upda=
te
would have to use [I-D.ietf-pce-enhanced-errors] as a normative reference (=
as
they will be providing details of Error-criticality and Propagation etc).
For any 'mature' draft it is better to use [I-D.ietf-pce-enhanced-errors]
as informative reference with details of error handling added into
[I-D.ietf-pce-enhanced-errors] itself (as already done for some drafts).

Thus my suggestion would be to say -

Error and Notification handling as per [I-D.ietf-pce-enhanced-errors] shoul=
d
be considered in PCE documents that include multi-PCE interactions. A
requirement for the editors of these drafts is to evaluate the applicabilit=
y
of the procedure in [I-D.ietf-pce-enhanced-errors] and provide details abou=
t
the "Error-criticality" TLV and "Propagation" TLV for errors and notificati=
ons
defined in the draft. Examples of this can be found in section 5.4.3 of
[I-D.ietf-pce-enhanced-errors].

Thoughts?

Thanks!
Dhruv

On Thu, Jun 6, 2019 at 3:38 PM Zhenghaomian (Zhenghaomian, Optical
Technology Research Dept) <zhenghaomian@huawei.com> wrote:
>
> Hi, Dhruv, WG,
>
> I think the following text would be helpful as the guideline.
>
> ------ guideline text starts ---------
> Error handling should be considered in any multi-PCE drafts. A requiremen=
t for the editors of these drafts is to evaluate what error types between P=
CE may occur in the specified scenarios in the draft and whether new error =
types need to be extended. It is also requested to check the applicability =
of the procedures specified in draft-ietf-pce-enhanced-errors to both the e=
xisting and the extending error types. For PCE protocol extension who gives=
 new error types, it is requested to provide description on the applicabili=
ty of "Propagation" TLV and "Error-criticality" TLV.
> ------ guideline text ends ---------
>
> Any comments or rephrasing would be more than welcome, thank you.
>
> Best wishes,
> Haomian
> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> =E5=8F=91=E4=BB=B6=E4=BA=BA: Dhruv Dhody [mailto:dhruv.ietf@gmail.com]
> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B46=E6=9C=883=E6=97=A5 1=
3:28
> =E6=94=B6=E4=BB=B6=E4=BA=BA: Zhenghaomian (Zhenghaomian, Optical Technolo=
gy Research Dept) <zhenghaomian@huawei.com>
> =E6=8A=84=E9=80=81: adrian@olddog.co.uk; pce@ietf.org
> =E4=B8=BB=E9=A2=98: Re: [Pce] =E7=AD=94=E5=A4=8D: PCEP Enhanced Errors
>
> Hi Haomian,
>
> Lets come up with the guidelines (and get the agreement on the mailing
> list) first!
> Then, lets take one of the I-D as example and work with the authors to in=
corporate the guidelines.
>
> We can worry about how to add guidelines to the wiki later. We can also a=
dd the guidelines in your draft itself.
>
> Thanks!
> Dhruv
>
>
> On Mon, Jun 3, 2019 at 7:20 AM Zhenghaomian (Zhenghaomian, Optical Techno=
logy Research Dept) <zhenghaomian@huawei.com> wrote:
> >
> > Hi, Adrian, WGs,
> >
> > Thank you for bringing the issue to the list, I think we agreed the dir=
ection you mentioned 'no haste but keep moving' in Prague. We would definit=
ely like to provide some text as guideline for other documents, either in t=
he draft or on the wiki page, or both. Personally I need to understand the =
context in the wiki page before doing that. Do the chairs want to see a sep=
arate paragraph talking about the error handling? Or we put the text togeth=
er with other sections like 'implement policy'?
> >
> > We can move on providing text once we can agree on how to manage, thank=
 you.
> >
> > Best wishes,
> > Haomian (as one of the co-authors)
> >
> > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> > =E5=8F=91=E4=BB=B6=E4=BA=BA: Pce [mailto:pce-bounces@ietf.org] =E4=BB=
=A3=E8=A1=A8 Adrian Farrel
> > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B45=E6=9C=8831=E6=97=
=A5 23:25
> > =E6=94=B6=E4=BB=B6=E4=BA=BA: pce@ietf.org
> > =E4=B8=BB=E9=A2=98: [Pce] PCEP Enhanced Errors
> >
> > Hi,
> >
> > In Prague we had a discussion of draft-ietf-pce-enhanced-errors.
> >
> > My recollection is that we decided that there was no great hurry to pus=
h this document to completion, but that we didn't want to abandon it.
> >
> > Checking back with the minutes, there was an objective that we encourag=
e authors of other documents to adhere to the error behaviours described in=
 this document. We do this possibly by putting text on a wiki page, but fir=
st by discussing the guidelines on the mailing list. Looks like we were par=
ticularly interested in the behaviours when there are multiple PCEs present=
.
> >
> > We also discussed the possibilities for encouraging an "Error Handling"
> > section in all our drafts, or at least for a section on "Error Handling=
 in Multi-PCE Scenarios" when applicable.
> >
> > Would the authors of draft-ietf-pce-enhanced-errors like to take the le=
ad on this?
> >
> > Thanks,
> > Adrian
> >
> > _______________________________________________
> > 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


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To: Dhruv Dhody <dhruv.ietf@gmail.com>
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From nobody Mon Jun 10 04:39:16 2019
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Subject: [Pce] I-D Action: draft-ietf-pce-stateful-hpce-09.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
                          Oscar Gonzalez de Dios
	Filename        : draft-ietf-pce-stateful-hpce-09.txt
	Pages           : 22
	Date            : 2019-06-10

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-09
https://datatracker.ietf.org/doc/html/draft-ietf-pce-stateful-hpce-09

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-stateful-hpce-09


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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Subject: Re: [Pce] I-D Action: draft-ietf-pce-stateful-hpce-09.txt
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Hi All, 

A new version updating author email addresses and catching a couple of NITS.


BR, Dan. 

-----Original Message-----
From: I-D-Announce <i-d-announce-bounces@ietf.org> On Behalf Of
internet-drafts@ietf.org
Sent: 10 June 2019 12:39
To: i-d-announce@ietf.org
Cc: pce@ietf.org
Subject: I-D Action: draft-ietf-pce-stateful-hpce-09.txt


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
                          Oscar Gonzalez de Dios
	Filename        : draft-ietf-pce-stateful-hpce-09.txt
	Pages           : 22
	Date            : 2019-06-10

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-09
https://datatracker.ietf.org/doc/html/draft-ietf-pce-stateful-hpce-09

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-stateful-hpce-09


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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Cc: <pce@ietf.org>
References: <02a601d4d9e8$4def3770$e9cda650$@olddog.co.uk> <E0C26CAA2504C84093A49B2CAC3261A43B7AFE60@dggeml511-mbx.china.huawei.com>
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Date: Mon, 10 Jun 2019 13:11:02 +0100
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Hi Haomian,=20

Thank you again for the review and suggestions. We believe we have =
addressed your comments.=20

BR, Dan.=20

-----Original Message-----
From: Pce <pce-bounces@ietf.org> On Behalf Of Zhenghaomian =
(Zhenghaomian, Optical Technology Research Dept)
Sent: 01 April 2019 08:39
To: adrian@olddog.co.uk; pce@ietf.org
Subject: [Pce] =E7=AD=94=E5=A4=8D: Working Group last call on =
draft-ietf-pce-stateful-hpce-06

Hi, WG,=20

I have read this document and believe this work is very useful. Stateful =
H-PCE will enable a more efficient way to do the computation with a =
group of PCEs. The document is in a good shape as well.=20

I support to move forward on this document, some minor comments are =
provided to be fixed after the LC:=20
- The page number in ToC is not consistent, maybe an update on word =
would be needed;=20
- PCEP stateful extension in RFC8231, and PCEP initiation extension in =
RFC8281, are usually considered as two separate works. Given the fact we =
have merged the gmpls extension with two features, it is reasonable to =
have these two features in the h-pce work as well. I noticed there is =
corresponding descriptions in section 3.3, and I think it would be =
useful if one sentence can be summarized in the abstract.=20

OLD:=20
   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).
NEW:
   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).=20
   Initialize the result of path computation from PCE is also helpful =
for=20
   the PCC to gracefully establish the computed LSP.=20

- As mentioned in IETF 104 PCE WG session =
(draft-ietf-pce-enhanced-errors), error handling issues need to be =
mentioned for inter-pce works, and this work exactly fits into the =
scope. It is suggested to add one small section about this. How about =
the following?=20

7.7.  Error Handling between PCEs
Error types specified in PCEP should be properly propagate between =
parent and child PCEs. The propagation, notification and criticality =
level defined in [I-D. ietf-pce-enhanced-errors] are recommended.=20

- The idnits report an unused reference 'pcep-yang', probably because of =
the line in section 7.2 for citation is not properly broken in the =
middle. Editing will be helpful to fix it.=20

We are looking forward to see the improvement after the WG LC, thank =
you.=20

Best wishes,
Haomian

-----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
=E5=8F=91=E4=BB=B6=E4=BA=BA: Pce [mailto:pce-bounces@ietf.org] =
=E4=BB=A3=E8=A1=A8 Adrian Farrel
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B43=E6=9C=8814=E6=97=A5 =
6:01
=E6=94=B6=E4=BB=B6=E4=BA=BA: pce@ietf.org
=E4=B8=BB=E9=A2=98: [Pce] Working Group last call on =
draft-ietf-pce-stateful-hpce-06

Hi working group,

This email starts a working group last call for =
draft-ietf-pce-stateful-hpce-06.

I would like to hear messages of support or concern about this draft.

If you support its progression towards publication as an RFC, please let =
us know that you have read the latest revision, and explain why you =
think the work is important. Indications of implementation would also be =
welcome - although this document is informational, I believe some people =
may have built stateful hierarchical PCEs for experimentation or =
deployment.

If you are opposed to the progression or have concerns please articulate =
them.

As always, review comments and nits are most welcome.

Because of the effort that is going in to preparing for IETF-104 and =
because of the time spent away, this last call will run for three weeks =
and end on April 4th.

Thanks,
Adrian

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Subject: Re: [Pce] Review of draft-ietf-pce-stateful-hpce
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Hi Document Shepherd, 

Thank you for your detailed review, comments and suggested text. 

The authors believe we have addressed all the open issue with the last two
revisions of the I-D. If you would be so kind as to scan through the changes
it would be very much appreciated. Please also find a number of comments
inline below (DK>>). 

BR, Dan. 

-----Original Message-----
From: Pce <pce-bounces@ietf.org> On Behalf Of Adrian Farrel
Sent: 25 March 2019 16:32
To: draft-ietf-pce-stateful-hpce@ietf.org
Cc: pce@ietf.org
Subject: [Pce] Review of draft-ietf-pce-stateful-hpce

Hi,

Good afternoon. My name is Adrian and I'll be your Document Shepherd for
this journey.

As this draft is progressing through working group last call, I thought I
would do my review now and save a little time later.

These comments may seem a little negative, but I hope you can address them
with small changes.

Thanks,
Adrian

===

Abstract

s/deployment of Stateful PCE(s)/deployment of Stateful PCEs/
DK>> Done
---
Section 1 para 1 needs a reference to 5440
DK>> Done
---
1.
s/for stateful PCE(s) in/for stateful PCEs in the/
DK>> Done
---

1.

   The initial section of the document focuses on end to end (E2E)
   inter-domain TE LSP. Section 3.3.1 describe the operations for the
   Per Domain LSP that could be stitched.

Maybe...

   Sections 3.1 and 3.2 focus on end to end (E2E) inter-domain TE LSPa.
   Section 3.3.1 describes the operations for stitching Per Domain LSPs.

DK>> Done
---

I am not certain that you need to use upper case terms in this document.

I found "SHOULD" in sections 6 and 7.2, and "MAY" twice in seciton 3.1
and once in section 3.3.1. Also "RECOMMENDED" in section 6.

Is this really appropriate in a document that is describing an
approach, not specifying bits on the wire or implementation behavior?

That would allow you to dispose of section 1.1 and the two references.


DK>> Done
---

Section 3

While the terms PE and CE are defined and used unambiguously, I suspect
that they will cause some confusion because they are such well known
terms in networking.

DK>> Done. We now use C-PCE towards P-PCE (EC-EP) or from a P-PCE towards
C-PCE (EP-EC). 
---

3.

   All PCE types herein (i.e., PE or CE) are assumed to be
   'stateful PCE'.

Is it not plausible to have a stateless C-PCE working with a stateful
P-PCE?

I think that the relationship of child to parent is similar to the
relationship of PCC to PCE, but when we talk about a stateful PCE we
don't also talk about a stateful PCC. So when you say that the C-PCE
must be stateful, you are necessarily talking about its relationship
with its PCCs.

If you are determined to limit the scope of this document to PCE
hierarchies where both the parent and child are stateful (you are
allowed to make this choice if that's what the WG wants) then you need
to make this clear in the Abstract and Introduction.

DK>> Done
---

Am I confused about delegation?

You have...
   The P-PCE has no information about the content of
   the child domains.

Clearly the C-PCE will report the path of the LSP (segment) that crosses
the domain for which it is responsible, but how can the P-PCE make any
change to that LSP without visibility into the child domain?

But you go on to talk about delegation as if it could work: such as...

   LSP Control Delegation (CE-PE,PE-CE):  a C-PCE grants to the P-PCE
      the right to update LSP attributes on one or more LSPs

When you draw the similarity between PCC-PCE and C-PCE-P-PCE delegation
as...
   Note that this hierarchy is recursive and thus a Label Switching
   Router (LSR), as a PCC could delegate the control to a PCE, which may
   delegate to its parent, which may further delegate it to its parent
   (if it exist or needed). Similarly update operations could also be
   applied recursively.
.... I think that you miss that the PCC and PCE can both see the TED, but
the C-PCE and P-PCE have very different visibility into the domain.

DK>> Done. We clarified the text. 
---

3.
Just clarity...

OLD
   [I-D.ietf-pce-hierarchy-extensions] defines the H-PCE capability TLV
   that should be used in the OPEN message to advertise the H-PCE
   capability. [RFC8231] defines the stateful PCE capability TLV. The
   presence of both TLVs represent the support for stateful H-PCE
   operations as described in this document.
NEW
   [I-D.ietf-pce-hierarchy-extensions] defines the H-PCE Capability TLV
   that is used in the OPEN message to advertise the H-PCE capability.
   [RFC8231] defines the Stateful PCE Capability TLV used in the OPEN
   message to indicate stateful support.  The presence of both TLVs in
   an OPEN message indicates the support for stateful H-PCE operations
   as described in this document.
END

DK>> Done. Thanks. 
---

3.
I feel that this paragraph is confusing. I think the referenced draft
also needs some work on the terms stateful and synchronization, but we
can focus on the document at hand.

OLD
   [I-D.litkowski-pce-state-sync] describes the procedures to allow a
   stateful communication between PCEs for various use-cases. The
   procedures and extensions as described in Section 3 of
   [I-D.litkowski-pce-state-sync] are also applicable to Child and
   Parent PCE communication. The SPEAKER-IDENTITY-TLV (defined in
   [RFC8232]) is included in the LSP object to identify the Ingress
   (PCC). The PLSP-ID used in the forwarded PCRpt by the C-PCE to P-PCE
   is same as the original one used by the PCC.
NEW
   [I-D.litkowski-pce-state-sync] describes the procedures to allow
   communication between stateful PCEs that serve the same domain.  The
   procedures and extensions as described in Section 3 of
   [I-D.litkowski-pce-state-sync] are also applicable to Child and
   Parent PCE communication.  The SPEAKER-IDENTITY-TLV (defined in
   [RFC8232]) is included in the LSP object to identify the Ingress
   (PCC). The PLSP-ID used in the forwarded PCRpt by the C-PCE to P-PCE
   is same as the original one used by the PCC.
END

However, this has made [I-D.litkowski-pce-state-sync] a normative
reference. I suspect you don't want to go there. That will mean you
need to write the normative text here (which may be a bit more of a
rewrite) and simply add...
   Similar procedures are used in [I-D.litkowski-pce-state-sync] to
   synchronize state between stateful PCEs that serve the same domain.

Furthermore, the term "Ingress" in unclear. You probably do not mean
the ingress of the LSP, per se. You probably mean the ingress of the
LSP in the domain that the C-PCE serves. You also have the term "ingress
PCE" (in 3.1) which is such a useful term that you should probably call
it out with a definition.

DK>> Done.

---

3.1

s/applicable to PCEP session/applicable to a PCEP session/

DK>> Done.
---

3.1

OLD
   Taking the sample hierarchical domain topology example from [RFC6805]
   as the reference topology for the entirety of this document.
NEW
   We use the sample hierarchical domain topology example from [RFC6805]
   as the reference topology for the entirety of this document.  It is
   shown in Figure 1.
END

DK>> Done.
---

3.1, 3.2, 3.3, and 3.3.1

It is confusing to have steps 1 to 11 as per 6805 and then introduce new
steps 1 to 4 in 3.1. We need to:
- not confuse these with steps 1 to 4 of 6805
- understand where in the sequence the steps are preformed

Furthermore, "initial" steps 1 to 8 are introduced in 3.2. Are these in
place of steps 1 to 4 in 3.1 or in addition? And where in the sequence
are they performed? How do they relate to steps 1 to 8 of 6805. There
is some slightly better description in 3.2, but only steps 1 and 2 seem
to be truly "initial".

It all needs some more clarity.

DK>> Done with updated text for clarity. 

By the time I got to 3.3.1 I really couldn't work out the steps at all.

DK>> We changed the procedure numbering mechanism, it will hopefully be
clearer to the reader. 
---

3.2

OLD
   To update an LSP, a PCE send to the PCC, an LSP Update Request using
   a PCUpd message.
NEW
   To update an LSP, a PCE sends an LSP Update Request to the PCC using
   a PCUpd message.
END

DK>> Done
---

3.3.  PCE Initiation Operation

Maybe...

3.3.  PCE Initiation of LSPs

DK>> Done
---

4.1

How about this for a slightly tidier figure 2?


                                                 +----------+
                                                 | Parent   |
                                                /| PCE      |
                                               / +----------+
                                              /     /   Stateful
                                             /     /    P-PCE
                                            /     /
                                           /     /
                          Stateful+-----+ /     /
                          C-PCE   | PCE |/     /
                          Hi      | Hi  |     /
                                  +-----+    /
          +---+    +---+                    /     +---+    +---+
         + LSR +--+ LSR +........................+ LSR +--+ LSR +
         + H1  +  + H2  +                 /      + H3  +  + H4  +
          +---+    +---+\         +-----+/       /+---+    +---+
                         \        | PCE |       /
                          \       | Lo  |      /
                Stateful   \      +-----+     /
                C-PCE       \                /
                Lo           \+---+    +---+/
                             + LSR +--+ LSR +
                             + L1  +  + L2  +
                              +---+    +---+

DK>> Excellent. Thanks. 
---

4.1

You have...

   All procedures described in Section 3 are applicable to inter-layer
   path setup as well.

I wonder if you want to explain that the layers are considered as
separate domains.

DK>> Done.
---

4.2

OLD
   [RFC8453] describes framework for Abstraction and Control of TE
   Networks (ACTN), where each Provisioning Network Controller (PNC) is
   equivalent to C-PCE and P-PCE is the Multi-Domain Service Coordinator
   (MDSC).  The Per domain stitched LSP as per the Hierarchical PCE
   architecture described in Section 3.3.1 and Section 4.1 is well
   suited for ACTN.
NEW
   [RFC8453] describes a framework for the Abstraction and Control of TE
   Networks (ACTN), where each Provisioning Network Controller (PNC) is
   equivalent to a C-PCE, and the P-PCE is the Multi-Domain Service
   Coordinator (MDSC).  The Per Domain stitched LSP as per the
   Hierarchical PCE architecture described in Section 3.3.1 and Section
   4.1 is well suited for ACTN.
END

DK>> Done. Again, thanks for text. 
---

4.2

OLD
   In ACTN framework, Customer Network Controller (CNC) can request the
   MDSC to check if there is a possibility to meet Virtual Network (VN)
   requirements (before requesting for VN provision).  The H-PCE
   architecture as described in [RFC6805] can supports via the use of
   PCReq and PCRep messages between the P-PCE and C-PCEs.
NEW
   In the ACTN framework, a Customer Network Controller (CNC) can
   request the MDSC to check whether there is a possibility to meet
   Virtual Network (VN) requirements before requesting for the VN to be
   provisioned.  The H-PCE architecture as described in [RFC6805] can
   support this function using PCReq and PCRep messages between the
   P-PCE and C-PCEs.
END

DK>> Done.
---

5.1

I think you need to rephrase this section. I don't think there is any
clear meaning to an LSP being involved in H-PCE.

But some of this issue can't be resolved until you have worked out what
it is that a stateful H-PCE actually does. As previously noted, it would
not appear to have access to the per-domain TEDs, so what is it doing
with an LSP that is reported or delegated to it?

Given what 5.2 says, reporting LSPs (not for delegation, but simply
reporting them) seems entirely pointless!

DK>> Updated text for clarity. 
---

I noticed that the Table of Contents doesn't match the actual sections
starting from Section 5. Possibly sections 4 and 5 were supposed to be
merged

DK>> Fixed. 
---

6. says

   The LSP
   state in the PCRpt message SHOULD continue to use this.

Can you explain when a PCRpt might deviate from this "SHOULD"?


DK>> Done.
---

6.

   Thus securing the PCEP session (between the P-PCE and the C-PCE)
   using mechanism like TCP Authentication Option (TCP-AO) [RFC5925] or
   Transport Layer Security (TLS) [RFC8253] is RECOMMENDED.

What does 'like' mean? Is there anything specific you have in mind?

DK>> Fixed. 

---

You have I-D.ietf-pce-pcep-yang in your references section, but no
actual reference to it.

DK>> Done.

---

A number of references need to be promoted to Normative consistent with
how you have used them in this document.

RFC 4655
RFC 5520
RFC 5925
RFC 8232
RFC 8253
I-D.litkowski-pce-state-sync
I-D.ietf-pce-hierarchy-extensions
I-D.dugeon-pce-stateful-interdomain

DK>> Done, and moved informative to normative where needed. 

Thanks, Dan and the other authors. 

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


From nobody Mon Jun 10 07:03:30 2019
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Subject: Re: [Pce] Review of draft-ietf-pce-stateful-hpce
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Thanks, Dan,

I'm checking the diffs and then I'll do the shepherd write-up and move the
document along.

Best,
Adrian

-----Original Message-----
From: Daniel King <dk@danielking.net> On Behalf Of daniel@olddog.co.uk
Sent: 10 June 2019 13:21
To: adrian@olddog.co.uk
Cc: pce@ietf.org
Subject: RE: [Pce] Review of draft-ietf-pce-stateful-hpce

Hi Document Shepherd, 

Thank you for your detailed review, comments and suggested text. 

The authors believe we have addressed all the open issue with the last two
revisions of the I-D. If you would be so kind as to scan through the changes
it would be very much appreciated. Please also find a number of comments
inline below (DK>>). 

BR, Dan. 


From nobody Mon Jun 10 13:45:05 2019
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From: Tarek Saad <tsaad@juniper.net>
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Thread-Topic: Comments on draft-dhs-spring-pce-sr-p2mp-policy
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Archived-At: <https://mailarchive.ietf.org/arch/msg/pce/9_UrrDU7gHw23D5dRihQ8JunO-U>
Subject: [Pce] Comments on draft-dhs-spring-pce-sr-p2mp-policy
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From nobody Tue Jun 11 05:01:09 2019
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Adrian Farrel has requested publication of draft-ietf-pce-stateful-hpce-09 as Informational on behalf of the PCE working group.

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


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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 Associating Working and Protection LSPs with Stateful PCE
        Authors         : Hariharan Ananthakrishnan
                          Siva Sivabalan
                          Colby Barth
                          Raveendra Torvi
                          Ina Minei
                          Edward Crabbe
                          Mahendra Singh Negi
	Filename        : draft-ietf-pce-stateful-path-protection-06.txt
	Pages           : 16
	Date            : 2019-06-12

Abstract:
   An active stateful Path Computation Element (PCE) is capable of
   computing as well as controlling via Path Computation Element
   Communication Protocol (PCEP) Multiprotocol Label Switching Traffic
   Engineering Label Switched Paths (MPLS LSP).  Furthermore, it is also
   possible for an active stateful PCE to create, maintain, and delete
   LSPs.  This document describes PCEP extension to associate two or
   more LSPs to provide end-to-end path protection.


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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-pce-stateful-path-protection-06
https://datatracker.ietf.org/doc/html/draft-ietf-pce-stateful-path-protection-06

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-stateful-path-protection-06


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: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Wed, 12 Jun 2019 16:42:54 +0530
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To: "Zhenghaomian (Zhenghaomian, Optical Technology Research Dept)" <zhenghaomian@huawei.com>
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Hi WG,

Haomian and I discussed this offline and came up with this guideline,
that should covers all the cases -

Error and Notification handling as per [I-D.ietf-pce-enhanced-errors] shoul=
d
be considered in PCE documents that include new errors and notifications. A
requirement for the authors of these drafts is to evaluate the applicabilit=
y
of the procedure in [I-D.ietf-pce-enhanced-errors] and provide details abou=
t
the "Error-criticality" TLV and "Propagation" TLV for errors and notificati=
ons
defined in the draft. Examples of this can be found in section 5.4.3 of
[I-D.ietf-pce-enhanced-errors].

Thoughts?

Dhruv

On Sat, Jun 8, 2019 at 7:26 PM Zhenghaomian (Zhenghaomian, Optical
Technology Research Dept) <zhenghaomian@huawei.com> wrote:
>
> Hi, Dhruv, WG,
>
> Thank you for the updating, please find my slight 'addition' as follow:
>
> Error and Notification handling as per [I-D.ietf-pce-enhanced-errors] sho=
uld be considered in PCE documents that include multi-PCE interactions.

[Dhruv]: Any new error / notifications definition should include the
recommended values for "Error-criticality" TLV and "Propagation" TLV.
So instead of "multi-PCE" interaction, better to say "new errors and
notifications".

> A requirement for the editors of these drafts is to evaluate the applicab=
ility of the procedure in [I-D.ietf-pce-enhanced-errors] and make a stateme=
nt on whether new error types need to be extended.

[Dhruv]:removed 'make a statement....'

>If yes, it is also requested to provide details about the "Error-criticali=
ty" TLV and "Propagation" TLV for errors and notifications defined in the d=
raft. Examples of this can be found in section 5.4.3 of [I-D.ietf-pce-enhan=
ced-errors].
>

> BTW, I have no problem on the criteria on whether to put the [I-D.ietf-pc=
e-enhanced-errors] as a normative reference or information reference, as th=
e error handling in 'Mature' drafts has already been included in the latest=
 version of  [I-D.ietf-pce-enhanced-errors].
>
> Best wishes,
> Haomian
>
> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> =E5=8F=91=E4=BB=B6=E4=BA=BA: Dhruv Dhody [mailto:dhruv.ietf@gmail.com]
> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B46=E6=9C=887=E6=97=A5 1=
9:16
> =E6=94=B6=E4=BB=B6=E4=BA=BA: Zhenghaomian (Zhenghaomian, Optical Technolo=
gy Research Dept) <zhenghaomian@huawei.com>
> =E6=8A=84=E9=80=81: adrian@olddog.co.uk; pce@ietf.org
> =E4=B8=BB=E9=A2=98: Re: [Pce] =E7=AD=94=E5=A4=8D: PCEP Enhanced Errors
>
> Hi Haomian, WG,
>
> Note that, this guideline should be for any 'future' draft, since this up=
date would have to use [I-D.ietf-pce-enhanced-errors] as a normative refere=
nce (as they will be providing details of Error-criticality and Propagation=
 etc).
> For any 'mature' draft it is better to use [I-D.ietf-pce-enhanced-errors]=
 as informative reference with details of error handling added into [I-D.ie=
tf-pce-enhanced-errors] itself (as already done for some drafts).
>
> Thus my suggestion would be to say -
>
> Error and Notification handling as per [I-D.ietf-pce-enhanced-errors] sho=
uld be considered in PCE documents that include multi-PCE interactions. A r=
equirement for the editors of these drafts is to evaluate the applicability=
 of the procedure in [I-D.ietf-pce-enhanced-errors] and provide details abo=
ut the "Error-criticality" TLV and "Propagation" TLV for errors and notific=
ations defined in the draft. Examples of this can be found in section 5.4.3=
 of [I-D.ietf-pce-enhanced-errors].
>
> Thoughts?
>
> Thanks!
> Dhruv
>
> On Thu, Jun 6, 2019 at 3:38 PM Zhenghaomian (Zhenghaomian, Optical Techno=
logy Research Dept) <zhenghaomian@huawei.com> wrote:
> >
> > Hi, Dhruv, WG,
> >
> > I think the following text would be helpful as the guideline.
> >
> > ------ guideline text starts --------- Error handling should be
> > considered in any multi-PCE drafts. A requirement for the editors of th=
ese drafts is to evaluate what error types between PCE may occur in the spe=
cified scenarios in the draft and whether new error types need to be extend=
ed. It is also requested to check the applicability of the procedures speci=
fied in draft-ietf-pce-enhanced-errors to both the existing and the extendi=
ng error types. For PCE protocol extension who gives new error types, it is=
 requested to provide description on the applicability of "Propagation" TLV=
 and "Error-criticality" TLV.
> > ------ guideline text ends ---------
> >
> > Any comments or rephrasing would be more than welcome, thank you.
> >
> > Best wishes,
> > Haomian
> > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> > =E5=8F=91=E4=BB=B6=E4=BA=BA: Dhruv Dhody [mailto:dhruv.ietf@gmail.com]
> > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B46=E6=9C=883=E6=97=A5=
 13:28
> > =E6=94=B6=E4=BB=B6=E4=BA=BA: Zhenghaomian (Zhenghaomian, Optical Techno=
logy Research Dept)
> > <zhenghaomian@huawei.com>
> > =E6=8A=84=E9=80=81: adrian@olddog.co.uk; pce@ietf.org
> > =E4=B8=BB=E9=A2=98: Re: [Pce] =E7=AD=94=E5=A4=8D: PCEP Enhanced Errors
> >
> > Hi Haomian,
> >
> > Lets come up with the guidelines (and get the agreement on the mailing
> > list) first!
> > Then, lets take one of the I-D as example and work with the authors to =
incorporate the guidelines.
> >
> > We can worry about how to add guidelines to the wiki later. We can also=
 add the guidelines in your draft itself.
> >
> > Thanks!
> > Dhruv
> >
> >
> > On Mon, Jun 3, 2019 at 7:20 AM Zhenghaomian (Zhenghaomian, Optical Tech=
nology Research Dept) <zhenghaomian@huawei.com> wrote:
> > >
> > > Hi, Adrian, WGs,
> > >
> > > Thank you for bringing the issue to the list, I think we agreed the d=
irection you mentioned 'no haste but keep moving' in Prague. We would defin=
itely like to provide some text as guideline for other documents, either in=
 the draft or on the wiki page, or both. Personally I need to understand th=
e context in the wiki page before doing that. Do the chairs want to see a s=
eparate paragraph talking about the error handling? Or we put the text toge=
ther with other sections like 'implement policy'?
> > >
> > > We can move on providing text once we can agree on how to manage, tha=
nk you.
> > >
> > > Best wishes,
> > > Haomian (as one of the co-authors)
> > >
> > > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> > > =E5=8F=91=E4=BB=B6=E4=BA=BA: Pce [mailto:pce-bounces@ietf.org] =E4=BB=
=A3=E8=A1=A8 Adrian Farrel
> > > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B45=E6=9C=8831=E6=97=
=A5 23:25
> > > =E6=94=B6=E4=BB=B6=E4=BA=BA: pce@ietf.org
> > > =E4=B8=BB=E9=A2=98: [Pce] PCEP Enhanced Errors
> > >
> > > Hi,
> > >
> > > In Prague we had a discussion of draft-ietf-pce-enhanced-errors.
> > >
> > > My recollection is that we decided that there was no great hurry to p=
ush this document to completion, but that we didn't want to abandon it.
> > >
> > > Checking back with the minutes, there was an objective that we encour=
age authors of other documents to adhere to the error behaviours described =
in this document. We do this possibly by putting text on a wiki page, but f=
irst by discussing the guidelines on the mailing list. Looks like we were p=
articularly interested in the behaviours when there are multiple PCEs prese=
nt.
> > >
> > > We also discussed the possibilities for encouraging an "Error Handlin=
g"
> > > section in all our drafts, or at least for a section on "Error Handli=
ng in Multi-PCE Scenarios" when applicable.
> > >
> > > Would the authors of draft-ietf-pce-enhanced-errors like to take the =
lead on this?
> > >
> > > Thanks,
> > > Adrian
> > >
> > > _______________________________________________
> > > 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


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From: "Siva Sivabalan (msiva)" <msiva@cisco.com>
To: Hariharan Ananthakrishnan <hari@netflix.com>, "ar2521@att.com" <ar2521@att.com>, "ag6941@att.com" <ag6941@att.com>, "cy098d@att.com" <cy098d@att.com>, "Jay Karthik (jakarthi)" <jakarthi@cisco.com>, "Jon Parker (jdparker)" <jdparker@cisco.com>, "mahendrasingh@huawei.com" <mahendrasingh@huawei.com>
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Thread-Topic: IPR poll on draft-ietf-pce-lsp-control-request-04
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Subject: Re: [Pce] IPR poll on draft-ietf-pce-lsp-control-request-04
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From: "RAGHURAM, ASWATNARAYAN" <ar2521@att.com>
To: "Siva Sivabalan (msiva)" <msiva@cisco.com>, Hariharan Ananthakrishnan <hari@netflix.com>, "GODDARD, AL" <ag6941@att.com>, "YADLAPALLI, CHAITANYA" <cy098d@att.com>, "Jay Karthik (jakarthi)" <jakarthi@cisco.com>, "Jon Parker (jdparker)" <jdparker@cisco.com>, "mahendrasingh@huawei.com" <mahendrasingh@huawei.com>
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To: Hariharan Ananthakrishnan <hari@netflix.com>, "GODDARD, AL" <ag6941@att.com>, "YADLAPALLI, CHAITANYA" <cy098d@att.com>, "jakarthi@cisco.com" <jakarthi@cisco.com>, "msiva@cisco.com" <msiva@cisco.com>, "jdparker@cisco.com" <jdparker@cisco.com>, "mahendrasingh@huawei.com" <mahendrasingh@huawei.com>
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Thread-Topic: IPR poll on draft-ietf-pce-lsp-control-request-04
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From: "YADLAPALLI, CHAITANYA" <cy098d@att.com>
To: Hariharan Ananthakrishnan <hari@netflix.com>, "RAGHURAM, ASWATNARAYAN" <ar2521@att.com>, "GODDARD, AL" <ag6941@att.com>, "jakarthi@cisco.com" <jakarthi@cisco.com>, "msiva@cisco.com" <msiva@cisco.com>, "jdparker@cisco.com" <jdparker@cisco.com>, "mahendrasingh@huawei.com" <mahendrasingh@huawei.com>
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Thread-Topic: IPR poll on draft-ietf-pce-lsp-control-request-04
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Date: Wed, 12 Jun 2019 12:59:04 +0000
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From: "Jon Parker (jdparker)" <jdparker@cisco.com>
To: Hariharan Ananthakrishnan <hari@netflix.com>, "ar2521@att.com" <ar2521@att.com>, "ag6941@att.com" <ag6941@att.com>, "cy098d@att.com" <cy098d@att.com>, "Jay Karthik (jakarthi)" <jakarthi@cisco.com>, "Siva Sivabalan (msiva)" <msiva@cisco.com>, "mahendrasingh@huawei.com" <mahendrasingh@huawei.com>
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From: "Jay Karthik (jakarthi)" <jakarthi@cisco.com>
To: Hariharan Ananthakrishnan <hari@netflix.com>, "ar2521@att.com" <ar2521@att.com>, "ag6941@att.com" <ag6941@att.com>, "cy098d@att.com" <cy098d@att.com>, "Siva Sivabalan (msiva)" <msiva@cisco.com>, "mahendrasingh@huawei.com" <mahendrasingh@huawei.com>, "Jon Parker (jdparker)" <jdparker@cisco.com>
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Thread-Topic: IPR poll on draft-ietf-pce-lsp-control-request-04
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Subject: Re: [Pce] IPR poll on draft-ietf-pce-lsp-control-request-04
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To: Hariharan Ananthakrishnan <hari=40netflix.com@dmarc.ietf.org>, "RAGHURAM,  ASWATNARAYAN" <ar2521@att.com>, "YADLAPALLI, CHAITANYA" <cy098d@att.com>,  "jakarthi@cisco.com" <jakarthi@cisco.com>, "msiva@cisco.com" <msiva@cisco.com>, "jdparker@cisco.com" <jdparker@cisco.com>, "mahendrasingh@huawei.com" <mahendrasingh@huawei.com>
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Thread-Topic: [Pce] IPR poll on draft-ietf-pce-lsp-control-request-04
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--_000_244F33C0B070774BB535D674687FE0E2664456E8MISOUT7MSGUSRCD_--


From nobody Wed Jun 12 14:50:18 2019
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Reply-To: <adrian@olddog.co.uk>
From: "Adrian Farrel" <adrian@olddog.co.uk>
To: <pce@ietf.org>
Date: Wed, 12 Jun 2019 22:50:06 +0100
Organization: Old Dog Consulting
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Subject: [Pce] Number of front page authors
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Hi folk,

A couple of recent drafts have reached "late stages" with six or more names
on the front page.

The RFC editor has indicated that five is the reasonable maximum, and the
IESG asks that we stick to that apart from in exceptional circumstances.

That means that when we do the Shepherd Write-up we have to include a
justification if you want more names on the front page. If you don't give us
that justification, then you are going to have to sort out the front page
before the draft progresses.

I know that this can be painful and disappointing, but if you don't do it or
provide a good reason, then the chairs will just have to do it for you. I
suspect you would prefer the smaller pain to the radical solution we might
provide. So please get on top of this small piece of administrivia.

A useful tool for you would be to never add the sixth name in the first
place. That is easily and completely under your control and will make any
later decisions easier.

Thanks,
Adrian


From nobody Wed Jun 12 21:37:24 2019
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From: Mahendra Singh Negi <mahendrasingh@huawei.com>
To: Hariharan Ananthakrishnan <hari@netflix.com>, "ar2521@att.com" <ar2521@att.com>, "ag6941@att.com" <ag6941@att.com>, "cy098d@att.com" <cy098d@att.com>, "jakarthi@cisco.com" <jakarthi@cisco.com>, "msiva@cisco.com" <msiva@cisco.com>, "jdparker@cisco.com" <jdparker@cisco.com>
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Thread-Topic: IPR poll on draft-ietf-pce-lsp-control-request-04
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Date: Thu, 13 Jun 2019 04:37:14 +0000
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Subject: Re: [Pce] IPR poll on draft-ietf-pce-lsp-control-request-04
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--_000_7e6e2db8de634f5e9677b9aea339293chuaweicom_--


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

I agree with Alvaro that lot of the references are really normative rather than
informative. I also share Mirja's concerns about lack of review.



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

(1) I share Mirja’s concerns about the lack of review per the shepherd write-up
.

(2) Section 5.  Per “The method may require several crankback …”, perhaps a
reference to RFC4920 might be appropriate.

(3) Section 5.1.3.  What does “protection” mean in the context of “It may be
necessary (for protection …) to computer a path that is partially or entirely
diverse …”?



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----------------------------------------------------------------------
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.



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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Mon, 17 Jun 2019 15:31:41 +0530
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Subject: Re: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04
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Hi WG,

The WG LC ends in 2 days. We would like to see some more responses before we
make the consensuses call. Please confirm if the document is ready to be sent
to the IESG. Detailed comments are always welcome!

Thanks!
Dhruv

On Tue, Jun 4, 2019 at 9:56 PM Dhruv Dhody <dhruv.ietf@gmail.com> wrote:
>
> Hi WG,
>
> This email starts a working group last call for
> draft-ietf-pce-lsp-control-request-04. The WG LC will run for 2 weeks, till
> 19th June 2019.
>
> https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-control-request/
>
> Please indicate your support or concern for this draft.
>
> If you are opposed to the progression of the draft, please articulate your
> concern.
>
> If you support, please indicate that you have read the latest version and
> it is ready for publication. Further, explaining the importance of the work in
> your opinion is appreciated.
>
> As always, review comments and nits are most welcome. Silence on the list, not
> so much :)
>
> Thanks,
> Dhruv, Julien, & Adrian


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Reply-To: <adrian@olddog.co.uk>
From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Dhruv Dhody'" <dhruv.ietf@gmail.com>, <pce@ietf.org>
Cc: <draft-ietf-pce-lsp-control-request@ietf.org>
References: <CAB75xn6EyVFHDQ-SGMJNGqjvfSBvBpWZ00M=ihfXzLStJ=yUJw@mail.gmail.com> <CAB75xn65BCnOLaGK=gRsVziev5aSb6osGdrYtpksnhwVc9B+ig@mail.gmail.com>
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Date: Mon, 17 Jun 2019 16:46:42 +0100
Organization: Old Dog Consulting
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Archived-At: <https://mailarchive.ietf.org/arch/msg/pce/R5pFwhu5FZk4HG-XGi5E17W9I-M>
Subject: Re: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04
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Hi,

Picking up on Dhruv's request, I did a quick review as co-chair. It's
after the end of WG last call, but life is full of little
disappointments.

Enjoy!

Adrian

===

Please reduce to five or fewer authors on the front page or provide the
shepherd with a good reason why not.

---

Please expand "LSP" in the document title.

---

I found the Abstract a bit hard to work through. How about...

   A stateful Path Computation Element (PCE) retains information about
   the placement of MPLS-TE Label Switched Paths (LSPs). When a PCE has
   stateful control over LSPs it may send indications to LSP head-ends 
   to modify the attributes (especially the paths) of the LSPs. A Path
   Computation Client (PCC) has set up LSPs under local
   configuration may delegate control of those LSPs to a stateful PCE.

   There are use-cases in which a stateful PCE may wish to obtain 
   control of locally configured LSPs of which it is aware but that have
   not been delegated to the PCE.

   This document describes an extension to the Path Computation Element
   communication Protocol (PCEP) to enable a PCE to make such requests.

---

Please expand abbreviations on first use in the body of the document
(even if they have already been used in the Abstract). I found:
- PCEP
- TE LSP
- PCC
- PCE

---

You need to move the block of text "Requirements Language" down to 
after the Introduction. Probably create a Section 2.1 for it.

That is also consistent with it not being appropriate to use 
Requirements Language in the Introduction. (You have just one "MAY" 
which can safely be made lower case.)

---

Section 3

s/a R/an R/
s/LSP(s)/LSPs/

OLD
   The LSP is identified by the LSP object.
NEW   
   The LSPs are identified by the LSP object.
END
   
---

Section 3 has...

   [RFC8281] defines a R (LSP-REMOVE) flag.

This is true, but not very relevant. You don't mention the R flag 
anywhere else.

Maybe just delete this?

---

Section 4

OLD
   LSP(s) is/are
NEW
   LSPs are
END

s/[RFC8231] ./[RFC8231]./

---

Section 4

   If the LSP(s) is/are already delegated to the PCE making
   the request, the PCC ignores the C Flag.

Doesn't this over-complicate things? Why not have the PCE always 
respond with D set or clear depending on whether it wants to have 
delegated? That way, a PCE that drops context (i.e., does it have 
control or not?) is able to regain context.

Or are you trying to prevent a thrash where...
PCE ---> C flag
                    D flag <--- PCC
PCE ---> D flag and C flag
                    D flag <--- PCC
PCE ---> D flag and C flag
                etc.
   
I see you don't give the PCE advice about not setting the C flag for
LSPs it already has delegate control over. That would lead to...

PCE ---> C flag
                    D flag <--- PCC
PCE ---> D flag 

---

Section 4

   In case multiple PCEs request control over an LSP, and if the PCC is
   willing to grant the control, the LSP MUST be delegated to only one
   PCE chosen by the PCC based on its local policy.

This might be clearer as...

   A PCC MUST NOT delegate an LSP to more than one PCE at any time.  If
   a PCE requests control of an LSP that has already been delegated by
   the PCC to another PCE, the PCE MAY ignore the request, or MAY revoke
   the delegation to the first PCE before delegating it to the second.
   This choice is a matter of local policy.

---

Section 4

   It should be noted that a legacy implementation of PCC, that does not
   understand the C flag in PCUpd message, would simply ignore the flag
   (and the request to grant control over the LSP).  At the same time it
   would trigger the error condition as specified in [RFC8231] (a PCErr
   with Error-type=19 (Invalid Operation) and error-value 1 (Attempted
   LSP Update Request for a non-delegated LSP)).

I looked through 8231 and 8281 and I don't find a discussion of handling
unknown flags. What is missing in 7.2 of 8231 is "Unassigned flags MUST
be set to zero on transmission, and unknown flags MUST be ignored on
receipt." I think that without that addition to 8231, your text doesn't
work.

---

Section 6

s/vectors/vector/

---

Section 7.1

It would be good if you could help IANA correctly identify the registry
you want actioned. I think this is...

   IANA maintains a registry called the "Path Computation Element
   Protocol (PCEP) Numbers" registry.  It contains a subregistry called
   the "SRP Object Flag Field" registry.

I note that the current registry reads...

   Value Description Reference
   0-30  Unassigned  [RFC8281]
    31   LSP-Remove  [RFC8281]

...so your proposed description for the c-bit is a bit lengthy.

---

Section 8.1

There is a further policy described in the document: that of deciding 
which of a pair of delegation requests to honour.

---

Not sure whether it belongs in 8.1 or 8.3...
The PCE that sends a delegation request and doesn't get a response "may
choose to retry requesting the control preferably using exponentially 
increasing timer." That implies a timer that should be configurable.

---

Not sure whether it belongs in 8.1 or 8.3 or 7...
The Security considerations section suggests dropping delegation 
requests if the PCC is swamped. I think you need to configure the 
threshold for swamping, and to recommend that the issue be logged.

-----Original Message-----
From: Pce <pce-bounces@ietf.org> On Behalf Of Dhruv Dhody
Sent: 17 June 2019 11:02
To: pce@ietf.org
Cc: draft-ietf-pce-lsp-control-request@ietf.org
Subject: Re: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04

Hi WG,

The WG LC ends in 2 days. We would like to see some more responses before we
make the consensuses call. Please confirm if the document is ready to be
sent
to the IESG. Detailed comments are always welcome!

Thanks!
Dhruv

On Tue, Jun 4, 2019 at 9:56 PM Dhruv Dhody <dhruv.ietf@gmail.com> wrote:
>
> Hi WG,
>
> This email starts a working group last call for
> draft-ietf-pce-lsp-control-request-04. The WG LC will run for 2 weeks,
till
> 19th June 2019.
>
> https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-control-request/
>
> Please indicate your support or concern for this draft.
>
> If you are opposed to the progression of the draft, please articulate your
> concern.
>
> If you support, please indicate that you have read the latest version and
> it is ready for publication. Further, explaining the importance of the
work in
> your opinion is appreciated.
>
> As always, review comments and nits are most welcome. Silence on the list,
not
> so much :)
>
> Thanks,
> Dhruv, Julien, & Adrian

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


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Subject: [Pce] I-D Action: draft-ietf-pce-stateful-hpce-10.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-10.txt
	Pages           : 21
	Date            : 2019-06-17

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-10
https://datatracker.ietf.org/doc/html/draft-ietf-pce-stateful-hpce-10

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-stateful-hpce-10


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

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Subject: Re: [Pce] I-D Action: draft-ietf-pce-stateful-hpce-10.txt
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Hi All, 

This revision of the I-D adjusts the number of document authors, from six to
five. 

BR, Dan. 

-----Original Message-----
From: Pce <pce-bounces@ietf.org> On Behalf Of internet-drafts@ietf.org
Sent: 17 June 2019 22:58
To: i-d-announce@ietf.org
Cc: pce@ietf.org
Subject: [Pce] I-D Action: draft-ietf-pce-stateful-hpce-10.txt


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-10.txt
	Pages           : 21
	Date            : 2019-06-17

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-10
https://datatracker.ietf.org/doc/html/draft-ietf-pce-stateful-hpce-10

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-stateful-hpce-10


Please note that it may take a couple of minutes from the time of submission
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ftp://ftp.ietf.org/internet-drafts/

_______________________________________________
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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Tue, 18 Jun 2019 10:18:26 +0530
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Cc: pce@ietf.org, draft-ietf-pce-lsp-control-request@ietf.org
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Subject: Re: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04
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On Mon, Jun 17, 2019 at 9:16 PM Adrian Farrel <adrian@olddog.co.uk> wrote:
>
> Hi,
>
> Picking up on Dhruv's request, I did a quick review as co-chair. It's
> after the end of WG last call, but life is full of little
> disappointments.
>

Thanks Adrian for your comments, they are still within the WG LC
period. The WG LC ends tomorrow i.e. 19th June 2019!

Regards,
Dhruv


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Subject: [Pce] I-D Action: draft-ietf-pce-stateful-path-protection-07.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 Associating Working and Protection LSPs with Stateful PCE
        Authors         : Hariharan Ananthakrishnan
                          Siva Sivabalan
                          Colby Barth
                          Ina Minei
                          Mahendra Singh Negi
	Filename        : draft-ietf-pce-stateful-path-protection-07.txt
	Pages           : 16
	Date            : 2019-06-17

Abstract:
   An active stateful Path Computation Element (PCE) is capable of
   computing as well as controlling via Path Computation Element
   Communication Protocol (PCEP) Multiprotocol Label Switching Traffic
   Engineering Label Switched Paths (MPLS LSP).  Furthermore, it is also
   possible for an active stateful PCE to create, maintain, and delete
   LSPs.  This document describes PCEP extension to associate two or
   more LSPs to provide end-to-end path protection.


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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-pce-stateful-path-protection-07
https://datatracker.ietf.org/doc/html/draft-ietf-pce-stateful-path-protection-07

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-stateful-path-protection-07


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

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Hi there

I have reviewed this draft for the routing directorate as part of preparing=
 it for IETF last call and IESG review.

I was familiar with this document from the time that I chaired the PCE work=
ing group, but this was the first time I read it all the way through and pa=
id attention to all details.  I found it easy to read and understand.  I th=
ink it is basically ready to go with a few small clarifications and nits, b=
elow.

Cheers
Jon

Document: draft-ietf-pce-stateful-pce-auto-bandwidth-09
Reviewer: Jon Hardwick
Review Date: 18 June 2019
IETF LC End Date: LC not started yet
Intended Status: Standards Track

Comments
Section 3 is somewhat redundant IMO.
4.1 you should ideally provide a reference for how to do MBB signalling.
4.3 "Similarly, if a PCC gets overwhelmed due to signaling churn, it can no=
tify the PCE to temporarily suspend new LSP setup requests."  I think this =
is covered by 5.7 as well as the PCE case, but you only refer to 5.7 for th=
e latter. Please point to 5.7 for both cases.
5.1 Not a big deal, but I wonder if there is any practical reason to differ=
entiate the final two bullets.
5.6 Why are AUTO-BANDWIDTH-ATTRIBUTES required (MUST) in the LSPA object of=
 a PCRpt?  If the LSP is PCE-initiated, then the PCE already knows what att=
ributes were specified.  If the LSP is PCC-Initiated, then the attributes a=
re the PCC's business - the PCE can't change them (per 5.5) and I don't thi=
nk the PCE even needs to know what they are.
7.2 Misuses RFC 2119 language to request an action from a working group.  I=
n other documents (when there is not already a draft in progress to do it) =
we have reworded this as "the YANG / MIB could be updated" etc.

Nits
5: "Extensions to the PCEP" would sound better as "PCEP Extensions"
7: In RFC 6123 it says "The Manageability Considerations section SHOULD be =
placed immediately before the Security Considerations section in any Intern=
et-Draft." - but here, it comes after.


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<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Hi there<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">I have reviewed this draft for =
the routing directorate as part of preparing it for IETF last call and IESG=
 review.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">I was familiar with this docume=
nt from the time that I chaired the PCE working group, but this was the fir=
st time I read it all the way through and paid attention to all details.&nb=
sp; I found it easy to read and understand.&nbsp;
 I think it is basically ready to go with a few small clarifications and ni=
ts, below.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Cheers<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Jon<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Document: draft-ietf-pce-statef=
ul-pce-auto-bandwidth-09<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Reviewer: Jon Hardwick<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Review Date: 18 June 2019<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">IETF LC End Date: LC not starte=
d yet<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Intended Status: Standards Trac=
k<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Comments<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Section 3 is somewhat redundant=
 IMO.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">4.1 you should ideally provide =
a reference for how to do MBB signalling.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">4.3 &#8220;Similarly, if a PCC =
gets overwhelmed due to signaling churn, it can notify the PCE to temporari=
ly suspend new LSP setup requests.&#8221; &nbsp;I think this is covered by =
5.7 as well as the PCE case, but you only refer to 5.7
 for the latter. Please point to 5.7 for both cases.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">5.1 Not a big deal, but I wonde=
r if there is any practical reason to differentiate the final two bullets.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">5.6 Why are AUTO-BANDWIDTH-ATTR=
IBUTES required (MUST) in the LSPA object of a PCRpt?&nbsp; If the LSP is P=
CE-initiated, then the PCE already knows what attributes were specified.&nb=
sp; If the LSP is PCC-Initiated, then the attributes
 are the PCC&#8217;s business &#8211; the PCE can&#8217;t change them (per =
5.5) and I don&#8217;t think the PCE even needs to know what they are.<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">7.2 Misuses RFC 2119 language t=
o request an action from a working group.&nbsp; In other documents (when th=
ere is not already a draft in progress to do it) we have reworded this as &=
#8220;the YANG / MIB could be updated&#8221; etc.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">Nits<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">5: &#8220;Extensions to the PCE=
P&#8221; would sound better as &#8220;PCEP Extensions&#8221;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">7: In RFC 6123 it says &#8220;T=
he Manageability Considerations section SHOULD be placed immediately before=
 the Security Considerations section in any Internet-Draft.&#8221; &#8211; =
but here, it comes after.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
</div>
</body>
</html>

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Julien Meuric has requested publication of draft-ietf-pce-stateful-path-protection-07 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-stateful-path-protection/


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From: "Mike Koldychev (mkoldych)" <mkoldych@cisco.com>
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Subject: Re: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04
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Support.

Thanks,
Mike.

-----Original Message-----
From: Pce <pce-bounces@ietf.org> On Behalf Of Dhruv Dhody
Sent: Tuesday, June 4, 2019 12:26 PM
To: pce@ietf.org
Cc: draft-ietf-pce-lsp-control-request@ietf.org
Subject: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04

Hi WG,

This email starts a working group last call for draft-ietf-pce-lsp-control-=
request-04. The WG LC will run for 2 weeks, till 19th June 2019.

https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-control-request/

Please indicate your support or concern for this draft.

If you are opposed to the progression of the draft, please articulate your =
concern.

If you support, please indicate that you have read the latest version and i=
t is ready for publication. Further, explaining the importance of the work =
in your opinion is appreciated.

As always, review comments and nits are most welcome. Silence on the list, =
not so much :)

Thanks,
Dhruv, Julien, & Adrian

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


From nobody Tue Jun 18 06:49:34 2019
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From: Mahendra Singh Negi <mahendrasingh@huawei.com>
To: Dhruv Dhody <dhruv.ietf@gmail.com>, Farrel Adrian <adrian@olddog.co.uk>
CC: "pce@ietf.org" <pce@ietf.org>, "draft-ietf-pce-lsp-control-request@ietf.org" <draft-ietf-pce-lsp-control-request@ietf.org>
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Subject: Re: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04
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Support

Regards

Hooman

From: Dhruv Dhody <dhruv.ietf@gmail.com<mailto:dhruv.ietf@gmail.com>>
Date: Tue, 4 Jun 2019 at 21:56
Subject: WG LC for draft-ietf-pce-lsp-control-request-04
To: <pce@ietf.org<mailto:pce@ietf.org>>
Cc: Hariharan Ananthakrishnan <hari@netflix.com<mailto:hari@netflix.com>>, =
<draft-ietf-pce-lsp-control-request@ietf.org<mailto:draft-ietf-pce-lsp-cont=
rol-request@ietf.org>>


Hi WG,

This email starts a working group last call for
draft-ietf-pce-lsp-control-request-04. The WG LC will run for 2 weeks, till
19th June 2019.

https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-control-request/

Please indicate your support or concern for this draft.

If you are opposed to the progression of the draft, please articulate your
concern.

If you support, please indicate that you have read the latest version and
it is ready for publication. Further, explaining the importance of the work=
 in
your opinion is appreciated.

As always, review comments and nits are most welcome. Silence on the list, =
not
so much :)

Thanks,
Dhruv, Julien, & Adrian


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<p class=3D"MsoNormal"><span lang=3D"EN-US">Support<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><br>
Regards<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><br>
Hooman<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">From: <strong>Dhruv Dhody</stro=
ng> &lt;<a href=3D"mailto:dhruv.ietf@gmail.com">dhruv.ietf@gmail.com</a>&gt=
;<br>
Date: Tue, 4 Jun 2019 at 21:56<br>
Subject: WG LC for draft-ietf-pce-lsp-control-request-04<br>
To: &lt;<a href=3D"mailto:pce@ietf.org">pce@ietf.org</a>&gt;<br>
Cc: Hariharan Ananthakrishnan &lt;<a href=3D"mailto:hari@netflix.com">hari@=
netflix.com</a>&gt;, &lt;<a href=3D"mailto:draft-ietf-pce-lsp-control-reque=
st@ietf.org">draft-ietf-pce-lsp-control-request@ietf.org</a>&gt;<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><br>
<br>
Hi WG,<br>
<br>
This email starts a working group last call for<br>
draft-ietf-pce-lsp-control-request-04. The WG LC will run for 2 weeks, till=
<br>
19th June 2019.<br>
<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-control-requ=
est/" target=3D"_blank">https://datatracker.ietf.org/doc/draft-ietf-pce-lsp=
-control-request/</a><br>
<br>
Please indicate your support or concern for this draft.<br>
<br>
If you are opposed to the progression of the draft, please articulate your<=
br>
concern.<br>
<br>
If you support, please indicate that you have read the latest version and<b=
r>
it is ready for publication. Further, explaining the importance of the work=
 in<br>
your opinion is appreciated.<br>
<br>
As always, review comments and nits are most welcome. Silence on the list, =
not<br>
so much :)<br>
<br>
Thanks,<br>
Dhruv, Julien, &amp; Adrian<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span>=
</p>
</div>
</body>
</html>

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Reply-To: <adrian@olddog.co.uk>
From: "Adrian Farrel" <adrian@olddog.co.uk>
To: <daniel@olddog.co.uk>, "'BRUNGARD, DEBORAH A'" <db3546@att.com>
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Subject: Re: [Pce] I-D Action: draft-ietf-pce-stateful-hpce-10.txt
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Thanks Dan.

Deborah, good to go.

Adrian

-----Original Message-----
From: Pce <pce-bounces@ietf.org> On Behalf Of daniel@olddog.co.uk
Sent: 17 June 2019 23:03
To: pce@ietf.org
Subject: Re: [Pce] I-D Action: draft-ietf-pce-stateful-hpce-10.txt

Hi All, 

This revision of the I-D adjusts the number of document authors, from six to
five. 

BR, Dan. 

-----Original Message-----
From: Pce <pce-bounces@ietf.org> On Behalf Of internet-drafts@ietf.org
Sent: 17 June 2019 22:58
To: i-d-announce@ietf.org
Cc: pce@ietf.org
Subject: [Pce] I-D Action: draft-ietf-pce-stateful-hpce-10.txt


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-10.txt
	Pages           : 21
	Date            : 2019-06-17

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-10
https://datatracker.ietf.org/doc/html/draft-ietf-pce-stateful-hpce-10

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-stateful-hpce-10


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

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

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Subject: [Pce] Chair's pre-adoption review of draft-leedhody-pce-vn-association-07
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Hi,

Since you indicated that you thought your draft was ready for adoption
by the working group, I have done a quick review. I realise that this
is work in progress and does not need to be perfect or even complete
at this stage, so I have tried to just pick out some points to tidy up
the document so that an adoption poll will be a bit smoother.

Thanks,

Adrian

====

The Table of Contents seems to be out of date.

---

It would be really helpful if you could include an Implementation
Status section consistent with the working group policy. If you have
nothing to report then just simply report that you have nothing to
report.

---

Section 3 has
   An LSP MUST belong to a single VNAG.

I think you probably mean...
   An LSP MUST NOT belong to more than one VNAG.

---

The figure at the top of page 6 seems to be about explaining VNs, but
you probably don't need to do that in this document.

---

Section 4

   The VIRTUAL-NETWORK-TLV MUST be included in VNAG object.

I think the "VNAG object" is an Association Object with the Association
Type set to "VNAG".

---

Section 6

Could you think about the implications of the VN name being in clear
text.


From nobody Tue Jun 18 19:12:45 2019
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Subject: Re: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04
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Yes/Support+1. This draft is important for controller.=20

Thanks for authors' contributions!

Best Regards,
Cheng


-----Original Message-----
From: Pce [mailto:pce-bounces@ietf.org] On Behalf Of Dhruv Dhody
Sent: Wednesday, June 05, 2019 12:26 AM
To: pce@ietf.org
Cc: draft-ietf-pce-lsp-control-request@ietf.org
Subject: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04

Hi WG,

This email starts a working group last call for draft-ietf-pce-lsp-control-=
request-04. The WG LC will run for 2 weeks, till 19th June 2019.

https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-control-request/

Please indicate your support or concern for this draft.

If you are opposed to the progression of the draft, please articulate your =
concern.

If you support, please indicate that you have read the latest version and i=
t is ready for publication. Further, explaining the importance of the work =
in your opinion is appreciated.

As always, review comments and nits are most welcome. Silence on the list, =
not so much :)

Thanks,
Dhruv, Julien, & Adrian

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CC: "draft-ietf-pce-lsp-control-request@ietf.org" <draft-ietf-pce-lsp-control-request@ietf.org>
Thread-Topic: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04
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Date: Wed, 19 Jun 2019 14:08:50 +0000
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Subject: Re: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04
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Support.

Thanks,
Chaitanya


-----Original Message-----
From: Pce <pce-bounces@ietf.org> On Behalf Of Dhruv Dhody
Sent: Tuesday, June 4, 2019 12:26 PM
To: pce@ietf.org
Cc: draft-ietf-pce-lsp-control-request@ietf.org
Subject: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04

Hi WG,

This email starts a working group last call for draft-ietf-pce-lsp-control-=
request-04. The WG LC will run for 2 weeks, till 19th June 2019.

https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ietf.org=
_doc_draft-2Dietf-2Dpce-2Dlsp-2Dcontrol-2Drequest_&d=3DDwIFAg&c=3DLFYZ-o9_H=
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Please indicate your support or concern for this draft.

If you are opposed to the progression of the draft, please articulate your =
concern.

If you support, please indicate that you have read the latest version and i=
t is ready for publication. Further, explaining the importance of the work =
in your opinion is appreciated.

As always, review comments and nits are most welcome. Silence on the list, =
not so much :)

Thanks,
Dhruv, Julien, & Adrian

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From: Young Lee <leeyoung@futurewei.com>
To: "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "draft-leedhody-pce-vn-association@ietf.org" <draft-leedhody-pce-vn-association@ietf.org>
CC: 'pce-chairs' <pce-chairs@ietf.org>, "pce@ietf.org" <pce@ietf.org>
Thread-Topic: Chair's pre-adoption review of draft-leedhody-pce-vn-association-07
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Subject: Re: [Pce] Chair's pre-adoption review of draft-leedhody-pce-vn-association-07
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--_003_CH2PR13MB3383FEACC632819ADA5B2A18CDE50CH2PR13MB3383namp_
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Hi Adrian,=20

Thanks for your review and paying attention to this draft. All your comment=
s are agreed and as such the proposed revision has incorporated your commen=
ts. Please see the proposed revision and the diff file attached. If you hav=
e any question on the revision, please let us know.

I will upload the draft shortly.=20

Thanks.
Young

-----Original Message-----
From: Adrian Farrel [mailto:adrian@olddog.co.uk]=20
Sent: Tuesday, June 18, 2019 4:11 PM
To: draft-leedhody-pce-vn-association@ietf.org
Cc: 'pce-chairs' <pce-chairs@ietf.org>; pce@ietf.org
Subject: Chair's pre-adoption review of draft-leedhody-pce-vn-association-0=
7

Hi,

Since you indicated that you thought your draft was ready for adoption by t=
he working group, I have done a quick review. I realise that this is work i=
n progress and does not need to be perfect or even complete at this stage, =
so I have tried to just pick out some points to tidy up the document so tha=
t an adoption poll will be a bit smoother.

Thanks,

Adrian

=3D=3D=3D=3D

The Table of Contents seems to be out of date.

---

It would be really helpful if you could include an Implementation Status se=
ction consistent with the working group policy. If you have nothing to repo=
rt then just simply report that you have nothing to report.

---

Section 3 has
   An LSP MUST belong to a single VNAG.

I think you probably mean...
   An LSP MUST NOT belong to more than one VNAG.

---

The figure at the top of page 6 seems to be about explaining VNs, but you p=
robably don't need to do that in this document.

---

Section 4

   The VIRTUAL-NETWORK-TLV MUST be included in VNAG object.

I think the "VNAG object" is an Association Object with the Association Typ=
e set to "VNAG".

---

Section 6

Could you think about the implications of the VN name being in clear text.


--_003_CH2PR13MB3383FEACC632819ADA5B2A18CDE50CH2PR13MB3383namp_
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--_003_CH2PR13MB3383FEACC632819ADA5B2A18CDE50CH2PR13MB3383namp_
Content-Type: text/plain; name="draft-leedhody-pce-vn-association-08.txt"
Content-Description: draft-leedhody-pce-vn-association-08.txt
Content-Disposition: attachment;
 filename="draft-leedhody-pce-vn-association-08.txt"; size=29098;
 creation-date="Wed, 19 Jun 2019 14:04:36 GMT";
 modification-date="Wed, 19 Jun 2019 14:04:36 GMT"
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--_003_CH2PR13MB3383FEACC632819ADA5B2A18CDE50CH2PR13MB3383namp_--


From nobody Wed Jun 19 07:17:34 2019
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From: "Jon Parker (jdparker)" <jdparker@cisco.com>
To: Dhruv Dhody <dhruv.ietf@gmail.com>, "pce@ietf.org" <pce@ietf.org>
CC: Hariharan Ananthakrishnan <hari@netflix.com>, "draft-ietf-pce-lsp-control-request@ietf.org" <draft-ietf-pce-lsp-control-request@ietf.org>
Thread-Topic: WG LC for draft-ietf-pce-lsp-control-request-04
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Date: Wed, 19 Jun 2019 14:17:19 +0000
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From: "Jay Karthik (jakarthi)" <jakarthi@cisco.com>
To: "pce@ietf.org" <pce@ietf.org>
CC: "draft-ietf-pce-lsp-control-request@ietf.org" <draft-ietf-pce-lsp-control-request@ietf.org>, "YADLAPALLI, CHAITANYA" <cy098d@att.com>
Thread-Topic: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04
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Date: Wed, 19 Jun 2019 14:22:46 +0000
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From: Young Lee <younglee.tx@gmail.com>
Date: Wed, 19 Jun 2019 09:32:20 -0500
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--00000000000081ee16058bae1964
Content-Type: text/plain; charset="UTF-8"

Hi WG,

The draft was revised to incorporate Adrian's comments on this draft. Among
the major changes is adding the implementation section. Please see the
below diff file for all the changes.

Thanks.
Young

---------- Forwarded message ---------
From: <internet-drafts@ietf.org>
Date: Wed, Jun 19, 2019, 9:17 AM
Subject: New Version Notification for
draft-leedhody-pce-vn-association-08.txt
To: Young Lee <younglee.tx@gmail.com>, Xian Zhang <zhang.xian@huawei.com>,
Daniele Ceccarelli <daniele.ceccarelli@ericsson.com>



A new version of I-D, draft-leedhody-pce-vn-association-08.txt
has been successfully submitted by Young Lee and posted to the
IETF repository.

Name:           draft-leedhody-pce-vn-association
Revision:       08
Title:          Path Computation Element communication Protocol (PCEP)
extensions for Establishing Relationships between sets of LSPs and Virtual
Networks
Document date:  2019-06-19
Group:          Individual Submission
Pages:          14
URL:
https://www.ietf.org/internet-drafts/draft-leedhody-pce-vn-association-08.txt
Status:
https://datatracker.ietf.org/doc/draft-leedhody-pce-vn-association/
Htmlized:
https://tools.ietf.org/html/draft-leedhody-pce-vn-association-08
Htmlized:
https://datatracker.ietf.org/doc/html/draft-leedhody-pce-vn-association
Diff:
https://www.ietf.org/rfcdiff?url2=draft-leedhody-pce-vn-association-08

Abstract:
   This document describes how to extend Path Computation Element (PCE)
   Communication Protocol (PCEP) association mechanism introduced by the
   PCEP Association Group specification, to further associate sets of
   LSPs with a higher-level structure such as a virtual network (VN)
   requested by clients or applications. This extended association
   mechanism can be used to facilitate virtual network control using PCE
   architecture.






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

--00000000000081ee16058bae1964
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto">Hi WG,<div dir=3D"auto"><br></div><div dir=3D"auto">The d=
raft was revised to incorporate Adrian&#39;s comments on this draft. Among =
the major changes is adding the implementation section. Please see the belo=
w diff file for all the changes.=C2=A0</div><div dir=3D"auto"><br></div><di=
v dir=3D"auto">Thanks.</div><div dir=3D"auto">Young</div></div><br><div cla=
ss=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">---------- Forward=
ed message ---------<br>From: <span dir=3D"auto">&lt;<a href=3D"mailto:inte=
rnet-drafts@ietf.org">internet-drafts@ietf.org</a>&gt;</span><br>Date: Wed,=
 Jun 19, 2019, 9:17 AM<br>Subject: New Version Notification for draft-leedh=
ody-pce-vn-association-08.txt<br>To: Young Lee &lt;<a href=3D"mailto:youngl=
ee.tx@gmail.com">younglee.tx@gmail.com</a>&gt;, Xian Zhang &lt;<a href=3D"m=
ailto:zhang.xian@huawei.com">zhang.xian@huawei.com</a>&gt;, Daniele Ceccare=
lli &lt;<a href=3D"mailto:daniele.ceccarelli@ericsson.com">daniele.ceccarel=
li@ericsson.com</a>&gt;<br></div><br><br><br>
A new version of I-D, draft-leedhody-pce-vn-association-08.txt<br>
has been successfully submitted by Young Lee and posted to the<br>
IETF repository.<br>
<br>
Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-leedhody-pce-vn-associa=
tion<br>
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A008<br>
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Path Computation Element communica=
tion Protocol (PCEP) extensions for Establishing Relationships between sets=
 of LSPs and Virtual Networks<br>
Document date:=C2=A0 2019-06-19<br>
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission<br>
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 14<br>
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://www.ietf.o=
rg/internet-drafts/draft-leedhody-pce-vn-association-08.txt" rel=3D"norefer=
rer noreferrer" target=3D"_blank">https://www.ietf.org/internet-drafts/draf=
t-leedhody-pce-vn-association-08.txt</a><br>
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.iet=
f.org/doc/draft-leedhody-pce-vn-association/" rel=3D"noreferrer noreferrer"=
 target=3D"_blank">https://datatracker.ietf.org/doc/draft-leedhody-pce-vn-a=
ssociation/</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://tools.ietf.org/html/=
draft-leedhody-pce-vn-association-08" rel=3D"noreferrer noreferrer" target=
=3D"_blank">https://tools.ietf.org/html/draft-leedhody-pce-vn-association-0=
8</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.ietf.org=
/doc/html/draft-leedhody-pce-vn-association" rel=3D"noreferrer noreferrer" =
target=3D"_blank">https://datatracker.ietf.org/doc/html/draft-leedhody-pce-=
vn-association</a><br>
Diff:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://www.ietf.o=
rg/rfcdiff?url2=3Ddraft-leedhody-pce-vn-association-08" rel=3D"noreferrer n=
oreferrer" target=3D"_blank">https://www.ietf.org/rfcdiff?url2=3Ddraft-leed=
hody-pce-vn-association-08</a><br>
<br>
Abstract:<br>
=C2=A0 =C2=A0This document describes how to extend Path Computation Element=
 (PCE)<br>
=C2=A0 =C2=A0Communication Protocol (PCEP) association mechanism introduced=
 by the<br>
=C2=A0 =C2=A0PCEP Association Group specification, to further associate set=
s of<br>
=C2=A0 =C2=A0LSPs with a higher-level structure such as a virtual network (=
VN)<br>
=C2=A0 =C2=A0requested by clients or applications. This extended associatio=
n<br>
=C2=A0 =C2=A0mechanism can be used to facilitate virtual network control us=
ing PCE<br>
=C2=A0 =C2=A0architecture.<br>
<br>
<br>
<br>
<br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" rel=3D"noreferrer noreferrer" target=3D"_blank">tools.ietf.org<=
/a>.<br>
<br>
The IETF Secretariat<br>
<br>
</div>

--00000000000081ee16058bae1964--


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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Thu, 20 Jun 2019 13:18:08 +0530
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To: pce@ietf.org
Cc: Hariharan Ananthakrishnan <hari@netflix.com>, draft-ietf-pce-lsp-control-request@ietf.org
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Subject: [Pce] WG LC ends for draft-ietf-pce-lsp-control-request-04
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Hi WG,

  The WG LC has ended. We seem to have support to move this work forward.
  Thanks to everyone who responded and especially to Adrian and Haomian for
  providing review comments.

Authors,

  please respond to comments and post a new update.

Hari,

  Thanks for being the document shepherd. Ball is now in your court to provide
  shepherd review and write-up, once the authors have made an update.

Thanks!
Dhruv, Julien, & Adrian

On Tue, Jun 4, 2019 at 9:56 PM Dhruv Dhody <dhruv.ietf@gmail.com> wrote:
>
> Hi WG,
>
> This email starts a working group last call for
> draft-ietf-pce-lsp-control-request-04. The WG LC will run for 2 weeks, till
> 19th June 2019.
>
> https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-control-request/
>
> Please indicate your support or concern for this draft.
>
> If you are opposed to the progression of the draft, please articulate your
> concern.
>
> If you support, please indicate that you have read the latest version and
> it is ready for publication. Further, explaining the importance of the work in
> your opinion is appreciated.
>
> As always, review comments and nits are most welcome. Silence on the list, not
> so much :)
>
> Thanks,
> Dhruv, Julien, & Adrian


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From: "Siva Sivabalan (msiva)" <msiva@cisco.com>
To: Dhruv Dhody <dhruv.ietf@gmail.com>, "pce@ietf.org" <pce@ietf.org>
CC: Hariharan Ananthakrishnan <hari@netflix.com>, "draft-ietf-pce-lsp-control-request@ietf.org" <draft-ietf-pce-lsp-control-request@ietf.org>
Thread-Topic: WG LC ends for draft-ietf-pce-lsp-control-request-04
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Subject: [Pce] I-D Action: draft-ietf-pce-lsp-control-request-05.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           : Ability for a stateful Path Computation Element (PCE) to request and obtain control of a Label Switched Path (LSP)
        Authors         : Aswatnarayan Raghuram
                          Al Goddard
                          Jay Karthik
                          Siva Sivabalan
                          Mahendra Singh Negi
	Filename        : draft-ietf-pce-lsp-control-request-05.txt
	Pages           : 12
	Date            : 2019-06-21

Abstract:
   A stateful Path Computation Element (PCE) retains information about
   the placement of Multiprotocol Label Switching (MPLS) Traffic
   Engineering Label Switched Paths (TE LSPs).  When a PCE has stateful
   control over LSPs it may send indications to LSP head-ends to modify
   the attributes (especially the paths) of the LSPs.  A Path
   Computation Client (PCC) has set up LSPs under local configuration
   may delegate control of those LSPs to a stateful PCE.

   There are use-cases in which a stateful PCE may wish to obtain
   control of locally configured LSPs of which it is aware but that have
   not been delegated to the PCE.

   This document describes an extension to the Path Computation Element
   communication Protocol (PCEP) to enable a PCE to make such requests.


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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-pce-lsp-control-request-05
https://datatracker.ietf.org/doc/html/draft-ietf-pce-lsp-control-request-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-lsp-control-request-05


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: Rakesh Gandhi <rgandhi.ietf@gmail.com>
Date: Fri, 21 Jun 2019 13:29:53 -0400
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Hi Jon,

Thank you for the review comments. Please see inline with <RG>...

On Tue, Jun 18, 2019 at 5:53 AM Jonathan Hardwick <Jonathan.Hardwick=3D
40metaswitch.com@dmarc.ietf.org> wrote:

> Hi there
>
>
>
> I have reviewed this draft for the routing directorate as part of
> preparing it for IETF last call and IESG review.
>
>
>
> I was familiar with this document from the time that I chaired the PCE
> working group, but this was the first time I read it all the way through
> and paid attention to all details.  I found it easy to read and
> understand.  I think it is basically ready to go with a few small
> clarifications and nits, below.
>
>
>
> Cheers
>
> Jon
>
>
>
> Document: draft-ietf-pce-stateful-pce-auto-bandwidth-09
>
> Reviewer: Jon Hardwick
>
> Review Date: 18 June 2019
>
> IETF LC End Date: LC not started yet
>
> Intended Status: Standards Track
>
>
>
> Comments
>
> Section 3 is somewhat redundant IMO.
>


<RG> We can keep it given the Figure showing the extensions unless there is
a preference to remove it.

4.1 you should ideally provide a reference for how to do MBB signalling.
>

<RG> Added [RFC3209].

4.3 =E2=80=9CSimilarly, if a PCC gets overwhelmed due to signaling churn, i=
t can
> notify the PCE to temporarily suspend new LSP setup requests.=E2=80=9D  I=
 think
> this is covered by 5.7 as well as the PCE case, but you only refer to 5.7
> for the latter. Please point to 5.7 for both cases.
>

<RG> Added.

5.1 Not a big deal, but I wonder if there is any practical reason to
> differentiate the final two bullets.
>


<RG> There is a precedence for the second bullet error message in [RFC
8231] (e.g. error-value 2). The first bullet error message just comes from
the existing behaviour without this extension.


5.6 Why are AUTO-BANDWIDTH-ATTRIBUTES required (MUST) in the LSPA object of
> a PCRpt?  If the LSP is PCE-initiated, then the PCE already knows what
> attributes were specified.  If the LSP is PCC-Initiated, then the
> attributes are the PCC=E2=80=99s business =E2=80=93 the PCE can=E2=80=99t=
 change them (per 5.5) and
> I don=E2=80=99t think the PCE even needs to know what they are.
>

<RG> Agree. Removed the sentence.


> 7.2 Misuses RFC 2119 language to request an action from a working group.
> In other documents (when there is not already a draft in progress to do i=
t)
> we have reworded this as =E2=80=9Cthe YANG / MIB could be updated=E2=80=
=9D etc.
>

<RG> Updated the text.


>
> Nits
>
> 5: =E2=80=9CExtensions to the PCEP=E2=80=9D would sound better as =E2=80=
=9CPCEP Extensions=E2=80=9D
>

<RG> Fixed.

7: In RFC 6123 it says =E2=80=9CThe Manageability Considerations section SH=
OULD be
> placed immediately before the Security Considerations section in any
> Internet-Draft.=E2=80=9D =E2=80=93 but here, it comes after.
>

<RG> Updated.

Thanks,
Rakesh



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

--0000000000001dfbba058bd8d021
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<div dir=3D"ltr"><div><font size=3D"2">Hi Jon,</font></div><div><font size=
=3D"2"><br></font></div><div><font size=3D"2">Thank you for the review comm=
ents. Please see inline with &lt;RG&gt;..</font><font size=3D"2">.<br></fon=
t></div><font size=3D"2"><br></font><div class=3D"gmail_quote"><div dir=3D"=
ltr" class=3D"gmail_attr"><font size=3D"2">On Tue, Jun 18, 2019 at 5:53 AM =
Jonathan Hardwick &lt;Jonathan.Hardwick=3D<a href=3D"mailto:40metaswitch.co=
m@dmarc.ietf.org">40metaswitch.com@dmarc.ietf.org</a>&gt; wrote:<br></font>=
</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_-1435570439436514305WordSection1">
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">Hi there</span=
></font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">=C2=A0</span><=
/font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">I have reviewe=
d this draft for the routing directorate as part of preparing it for IETF l=
ast call and IESG review.</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">=C2=A0</span><=
/font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">I was familiar=
 with this document from the time that I chaired the PCE working group, but=
 this was the first time I read it all the way through and paid attention t=
o all details.=C2=A0 I found it easy to read and understand.=C2=A0
 I think it is basically ready to go with a few small clarifications and ni=
ts, below.</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">=C2=A0</span><=
/font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">Cheers</span><=
/font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">Jon</span></fo=
nt></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">=C2=A0</span><=
/font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">Document: draf=
t-ietf-pce-stateful-pce-auto-bandwidth-09</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">Reviewer: Jon =
Hardwick</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">Review Date: 1=
8 June 2019</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">IETF LC End Da=
te: LC not started yet</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">Intended Statu=
s: Standards Track</span></font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">=C2=A0</span><=
/font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">Comments</span=
></font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">Section 3 is s=
omewhat redundant IMO.</span></font></p></div></div></blockquote><div><font=
 size=3D"2">=C2=A0


















</font><p class=3D"MsoNormal" style=3D"margin:0cm 0cm 0.0001pt;font-family:=
&quot;Calibri&quot;,sans-serif"><font size=3D"2">&lt;RG&gt; We can keep it =
given the Figure showing the
extensions unless there is a preference to remove it.<span></span></font></=
p>





</div><div><font size=3D"2"><br></font></div><blockquote class=3D"gmail_quo=
te" 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_-143557043943=
6514305WordSection1"><p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"=
EN-GB"></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">4.1 you should=
 ideally provide a reference for how to do MBB signalling.</span></font></p=
></div></div></blockquote><div><font size=3D"2"><br></font></div><div><font=
 size=3D"2">&lt;RG&gt; Added [RFC3209].</font></div><div> <font size=3D"2">=
<br></font></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 lan=
g=3D"EN-US"><div class=3D"gmail-m_-1435570439436514305WordSection1"><p clas=
s=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB"></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">4.3 =E2=80=9CS=
imilarly, if a PCC gets overwhelmed due to signaling churn, it can notify t=
he PCE to temporarily suspend new LSP setup requests.=E2=80=9D =C2=A0I thin=
k this is covered by 5.7 as well as the PCE case, but you only refer to 5.7
 for the latter. Please point to 5.7 for both cases.</span></font></p></div=
></div></blockquote><div><font size=3D"2"><br></font></div><div><font size=
=3D"2">&lt;RG&gt; Added.</font></div><div> <font size=3D"2"><br></font></di=
v><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;borde=
r-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang=3D"EN-US"><di=
v class=3D"gmail-m_-1435570439436514305WordSection1"><p class=3D"MsoNormal"=
><font size=3D"2"><span lang=3D"EN-GB"></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">5.1 Not a big =
deal, but I wonder if there is any practical reason to differentiate the fi=
nal two bullets.</span></font></p></div></div></blockquote><div><font size=
=3D"2">=C2=A0


















</font><p class=3D"MsoNormal" style=3D"margin:0cm 0cm 0.0001pt;font-family:=
&quot;Calibri&quot;,sans-serif"><font size=3D"2">&lt;RG&gt; There is a prec=
edence for the second bullet error
message in [RFC 8231] (e.g. error-value 2). The first bullet error message =
just
comes from the existing behaviour without this extension.<span></span></fon=
t></p>





</div><div><font size=3D"2"><br></font></div><div><font size=3D"2"><br></fo=
nt></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang=3D"EN-=
US"><div class=3D"gmail-m_-1435570439436514305WordSection1"><p class=3D"Mso=
Normal"><font size=3D"2"><span lang=3D"EN-GB"></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">5.6 Why are AU=
TO-BANDWIDTH-ATTRIBUTES required (MUST) in the LSPA object of a PCRpt?=C2=
=A0 If the LSP is PCE-initiated, then the PCE already knows what attributes=
 were specified.=C2=A0 If the LSP is PCC-Initiated, then the attributes
 are the PCC=E2=80=99s business =E2=80=93 the PCE can=E2=80=99t change them=
 (per 5.5) and I don=E2=80=99t think the PCE even needs to know what they a=
re.</span></font></p></div></div></blockquote><div><font size=3D"2"><br></f=
ont></div><div>


















<p class=3D"MsoNormal" style=3D"margin:0cm 0cm 0.0001pt;font-family:&quot;C=
alibri&quot;,sans-serif"><font size=3D"2">&lt;RG&gt; Agree. Removed the sen=
tence.<span></span></font></p>





</div><div><font size=3D"2">=C2=A0</font></div><blockquote class=3D"gmail_q=
uote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,2=
04);padding-left:1ex"><div lang=3D"EN-US"><div class=3D"gmail-m_-1435570439=
436514305WordSection1"><p class=3D"MsoNormal"><font size=3D"2"><span lang=
=3D"EN-GB"></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">7.2 Misuses RF=
C 2119 language to request an action from a working group.=C2=A0 In other d=
ocuments (when there is not already a draft in progress to do it) we have r=
eworded this as =E2=80=9Cthe YANG / MIB could be updated=E2=80=9D etc.</spa=
n></font></p></div></div></blockquote><div><font size=3D"2"><br></font></di=
v><div><font size=3D"2">&lt;RG&gt; Updated the text.</font></div><div> <fon=
t size=3D"2"><br></font></div><blockquote class=3D"gmail_quote" style=3D"ma=
rgin: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_-1435570439436514305WordSect=
ion1"><p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB"></span><=
/font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">=C2=A0</span><=
/font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">Nits</span></f=
ont></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">5: =E2=80=9CEx=
tensions to the PCEP=E2=80=9D would sound better as =E2=80=9CPCEP Extension=
s=E2=80=9D</span></font></p></div></div></blockquote><div><font size=3D"2">=
<br></font></div><div><font size=3D"2">&lt;RG&gt; Fixed.</font></div><div> =
<font size=3D"2"><br></font></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 lang=3D"EN-US"><div class=3D"gmail-m_-1435570439436514305Wo=
rdSection1"><p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB"></=
span></font></p>
<p class=3D"MsoNormal"><font size=3D"2"><span lang=3D"EN-GB">7: In RFC 6123=
 it says =E2=80=9CThe Manageability Considerations section SHOULD be placed=
 immediately before the Security Considerations section in any Internet-Dra=
ft.=E2=80=9D =E2=80=93 but here, it comes after.</span></font></p>
</div></div></blockquote><div><font size=3D"2"><br></font></div><div><font =
size=3D"2">&lt;RG&gt; Updated.<br></font></div><div><font size=3D"2">=C2=A0=
</font></div><div><font size=3D"2">Thanks,</font></div><div><font size=3D"2=
">Rakesh</font></div><div><font size=3D"2"><br></font></div><div><br></div>=
<div><br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0p=
x 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang=
=3D"EN-US"><div class=3D"gmail-m_-1435570439436514305WordSection1"><p class=
=3D"MsoNormal"><span lang=3D"EN-GB"><u></u></span></p>
</div>
</div>

_______________________________________________<br>
Pce mailing list<br>
<a href=3D"mailto:Pce@ietf.org" target=3D"_blank">Pce@ietf.org</a><br>
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Subject: [Pce] I-D Action: draft-ietf-pce-stateful-pce-auto-bandwidth-10.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 MPLS-TE LSP Automatic Bandwidth Adjustment with Stateful PCE
        Authors         : Dhruv Dhody
                          Udayasree Palle
                          Ravi Singh
                          Rakesh Gandhi
                          Luyuan Fang
	Filename        : draft-ietf-pce-stateful-pce-auto-bandwidth-10.txt
	Pages           : 31
	Date            : 2019-06-21

Abstract:
   The Path Computation Element Communication Protocol (PCEP) provides
   mechanisms for Path Computation Elements (PCEs) to perform path
   computations in response to Path Computation Clients (PCCs) requests.
   The Stateful PCE extensions allow stateful control of Multi-Protocol
   Label Switching (MPLS) Traffic Engineering Label Switched Paths (TE
   LSPs) using PCEP.

   The automatic bandwidth feature allows automatic and dynamic
   adjustment of the TE LSP bandwidth reservation based on the volume of
   traffic flowing through the LSP.  This document describes PCEP
   extensions for automatic bandwidth adjustment when employing an
   Active Stateful PCE for both PCE-Initiated and PCC-Initiated LSPs.



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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-pce-stateful-pce-auto-bandwidth-10
https://datatracker.ietf.org/doc/html/draft-ietf-pce-stateful-pce-auto-bandwidth-10

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-stateful-pce-auto-bandwidth-10


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

Internet-Drafts are also available by anonymous FTP at:
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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-ietf-pce-lsp-control-request@ietf.org" <draft-ietf-pce-lsp-control-request@ietf.org>, "dhruv.ietf@gmail.com" <dhruv.ietf@gmail.com>
Thread-Topic: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04
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Subject: Re: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04
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Hi Adrian,

We have posted a new update handling the comments from you and Haomian.

I-D: https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-control-request/

Diff: https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-pce-lsp-control-reques=
t-05

Snipping to

---
Section 4

  If the LSP(s) is/are already delegated to the PCE making the request, the=
 PCC ignores the C Flag.
Doesn't this over-complicate things? Why not have the PCE always respond wi=
th D set or clear depending on whether it wants to have delegated? That way=
, a PCE that drops context (i.e., does it have control or not?) is able to =
regain context.

Or are you trying to prevent a thrash where...
PCE    ---> C flag
D flag <--- PCC
PCE    ---> D flag and C flag
D flag <--- PCC
PCE    ---> D flag and C flag etc.

I see you don't give the PCE advice about not setting the C flag for LSP, i=
t already has delegate control over. That would lead to...

PCE    ---> C flag
D flag <--- PCC
PCE    ---> D flag

--
First, we rephrased this for clarity -

  The PCE SHOULD
  NOT send control request for LSP which is already delegated to the
  PCE, i.e. if the D flag is set in the PCUpd message, then C flag
  SHOULD NOT be set. If a PCC receives a PCUpd message with D flag set
  in the LSP object (i.e. LSP is already delegated) and the C flag is
  also set (i.e. PCE is making a control request), the PCC MUST ignore
  the C Flag.

Second, for a delegated LSP, PCE always sends PCUpd with the D flag set unl=
ess it wants revocation of the delegation. Both D and C flag in PCUpd messa=
ge should not be set together. We wanted to have a new flag to independentl=
y indicate 'LSP control request' and not overload the existing flag.

---
Section 4
  It should be noted that a legacy implementation of PCC, that does not
  understand the C flag in PCUpd message, would simply ignore the flag (and=
 the request to grant control over the LSP). At the same time it would trig=
ger the error condition as specified in [RFC8231] (a PCErr with Error-type=
=3D19 (Invalid Operation) and error-value 1 (Attempted LSP Update Request f=
or a non-delegated LSP)).

  I looked through 8231 and 8281 and I don't find a discussion of handling =
unknown flags. What is missing in 7.2 of 8231 is "Unassigned flags MUST be =
set to zero on transmission, and unknown flags MUST be ignored on receipt."=
 I think that without that addition to 8231, your text doesn't work.

---
We rephrased this to say -

  It should be noted that a legacy implementation of PCC, that does not
  support this extension would trigger the error condition as specified
  in [RFC8231] (a PCErr with Error-type=3D19 (Invalid Operation) and
  error-value 1 (Attempted LSP Update Request for a non-delegated LSP))
  as the D flag would be unset in this update request. Further, in
  case of PLSP-ID of 0, the error condition as specified in [RFC8231]
  (a PCErr with Error-type=3D19 (Invalid Operation) and error-value 3
  (Attempted LSP Update Request for an LSP identified by an unknown
  PSP-ID)) would be triggered.

So this I-D can be progressed independently, while the WG decides how to ha=
ndle the missing statement in RFC 8231.

Thanks for your review,
Mahendra

--------------------------------------------------
Mahendra Singh Negi Mahendra
Mobile: +91-7204000290<tel:+91-7204000290>
Email: mahendrasingh@huawei.com<mailto:mahendrasingh@huawei.com>
From:Adrian Farrel <adrian@olddog.co.uk>
To:'Dhruv Dhody' <dhruv.ietf@gmail.com>;pce@ietf.org <pce@ietf.org>
Cc:draft-ietf-pce-lsp-control-request@ietf.org <draft-ietf-pce-lsp-control-=
request@ietf.org>
Date:2019-06-17 21:17:02
Subject:RE: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04

Hi,

Picking up on Dhruv's request, I did a quick review as co-chair. It's
after the end of WG last call, but life is full of little
disappointments.

Enjoy!

Adrian

=3D=3D=3D

Please reduce to five or fewer authors on the front page or provide the
shepherd with a good reason why not.

---

Please expand "LSP" in the document title.

---

I found the Abstract a bit hard to work through. How about...

   A stateful Path Computation Element (PCE) retains information about
   the placement of MPLS-TE Label Switched Paths (LSPs). When a PCE has
   stateful control over LSPs it may send indications to LSP head-ends
   to modify the attributes (especially the paths) of the LSPs. A Path
   Computation Client (PCC) has set up LSPs under local
   configuration may delegate control of those LSPs to a stateful PCE.

   There are use-cases in which a stateful PCE may wish to obtain
   control of locally configured LSPs of which it is aware but that have
   not been delegated to the PCE.

   This document describes an extension to the Path Computation Element
   communication Protocol (PCEP) to enable a PCE to make such requests.

---

Please expand abbreviations on first use in the body of the document
(even if they have already been used in the Abstract). I found:
- PCEP
- TE LSP
- PCC
- PCE

---

You need to move the block of text "Requirements Language" down to
after the Introduction. Probably create a Section 2.1 for it.

That is also consistent with it not being appropriate to use
Requirements Language in the Introduction. (You have just one "MAY"
which can safely be made lower case.)

---

Section 3

s/a R/an R/
s/LSP(s)/LSPs/

OLD
   The LSP is identified by the LSP object.
NEW
   The LSPs are identified by the LSP object.
END

---

Section 3 has...

   [RFC8281] defines a R (LSP-REMOVE) flag.

This is true, but not very relevant. You don't mention the R flag
anywhere else.

Maybe just delete this?

---

Section 4

OLD
   LSP(s) is/are
NEW
   LSPs are
END

s/[RFC8231] ./[RFC8231]./

---

Section 4

   If the LSP(s) is/are already delegated to the PCE making
   the request, the PCC ignores the C Flag.

Doesn't this over-complicate things? Why not have the PCE always
respond with D set or clear depending on whether it wants to have
delegated? That way, a PCE that drops context (i.e., does it have
control or not?) is able to regain context.

Or are you trying to prevent a thrash where...
PCE ---> C flag
                    D flag <--- PCC
PCE ---> D flag and C flag
                    D flag <--- PCC
PCE ---> D flag and C flag
                etc.

I see you don't give the PCE advice about not setting the C flag for
LSPs it already has delegate control over. That would lead to...

PCE ---> C flag
                    D flag <--- PCC
PCE ---> D flag

---

Section 4

   In case multiple PCEs request control over an LSP, and if the PCC is
   willing to grant the control, the LSP MUST be delegated to only one
   PCE chosen by the PCC based on its local policy.

This might be clearer as...

   A PCC MUST NOT delegate an LSP to more than one PCE at any time.  If
   a PCE requests control of an LSP that has already been delegated by
   the PCC to another PCE, the PCE MAY ignore the request, or MAY revoke
   the delegation to the first PCE before delegating it to the second.
   This choice is a matter of local policy.

---

Section 4

   It should be noted that a legacy implementation of PCC, that does not
   understand the C flag in PCUpd message, would simply ignore the flag
   (and the request to grant control over the LSP).  At the same time it
   would trigger the error condition as specified in [RFC8231] (a PCErr
   with Error-type=3D19 (Invalid Operation) and error-value 1 (Attempted
   LSP Update Request for a non-delegated LSP)).

I looked through 8231 and 8281 and I don't find a discussion of handling
unknown flags. What is missing in 7.2 of 8231 is "Unassigned flags MUST
be set to zero on transmission, and unknown flags MUST be ignored on
receipt." I think that without that addition to 8231, your text doesn't
work.

---

Section 6

s/vectors/vector/

---

Section 7.1

It would be good if you could help IANA correctly identify the registry
you want actioned. I think this is...

   IANA maintains a registry called the "Path Computation Element
   Protocol (PCEP) Numbers" registry.  It contains a subregistry called
   the "SRP Object Flag Field" registry.

I note that the current registry reads...

   Value Description Reference
   0-30  Unassigned  [RFC8281]
    31   LSP-Remove  [RFC8281]

...so your proposed description for the c-bit is a bit lengthy.

---

Section 8.1

There is a further policy described in the document: that of deciding
which of a pair of delegation requests to honour.

---

Not sure whether it belongs in 8.1 or 8.3...
The PCE that sends a delegation request and doesn't get a response "may
choose to retry requesting the control preferably using exponentially
increasing timer." That implies a timer that should be configurable.

---

Not sure whether it belongs in 8.1 or 8.3 or 7...
The Security considerations section suggests dropping delegation
requests if the PCC is swamped. I think you need to configure the
threshold for swamping, and to recommend that the issue be logged.

-----Original Message-----
From: Pce <pce-bounces@ietf.org> On Behalf Of Dhruv Dhody
Sent: 17 June 2019 11:02
To: pce@ietf.org
Cc: draft-ietf-pce-lsp-control-request@ietf.org
Subject: Re: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04

Hi WG,

The WG LC ends in 2 days. We would like to see some more responses before w=
e
make the consensuses call. Please confirm if the document is ready to be
sent
to the IESG. Detailed comments are always welcome!

Thanks!
Dhruv

On Tue, Jun 4, 2019 at 9:56 PM Dhruv Dhody <dhruv.ietf@gmail.com> wrote:
>
> Hi WG,
>
> This email starts a working group last call for
> draft-ietf-pce-lsp-control-request-04. The WG LC will run for 2 weeks,
till
> 19th June 2019.
>
> https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-control-request/
>
> Please indicate your support or concern for this draft.
>
> If you are opposed to the progression of the draft, please articulate you=
r
> concern.
>
> If you support, please indicate that you have read the latest version and
> it is ready for publication. Further, explaining the importance of the
work in
> your opinion is appreciated.
>
> As always, review comments and nits are most welcome. Silence on the list=
,
not
> so much :)
>
> Thanks,
> Dhruv, Julien, & Adrian

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


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<div>
<div>Hi Adrian, <br>
<br>
We have posted a new update handling the comments from you and Haomian. <br=
>
<br>
I-D: https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-control-request/<b=
r>
<br>
Diff: https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-pce-lsp-control-reques=
t-05<br>
<br>
Snipping to <br>
<br>
---<br>
Section 4<br>
<br>
&nbsp; If the LSP(s) is/are already delegated to the PCE making the request=
, the PCC ignores the C Flag.<br>
Doesn't this over-complicate things? Why not have the PCE always respond wi=
th D set or clear depending on whether it wants to have delegated? That way=
, a PCE that drops context (i.e., does it have control or not?) is able to =
regain context.<br>
<br>
Or are you trying to prevent a thrash where...<br>
PCE&nbsp;&nbsp;&nbsp; ---&gt; C flag<br>
D flag &lt;--- PCC<br>
PCE&nbsp;&nbsp;&nbsp; ---&gt; D flag and C flag<br>
D flag &lt;--- PCC<br>
PCE&nbsp;&nbsp;&nbsp; ---&gt; D flag and C flag etc.<br>
<br>
I see you don't give the PCE advice about not setting the C flag for LSP, i=
t already has delegate control over. That would lead to...<br>
<br>
PCE&nbsp;&nbsp;&nbsp; ---&gt; C flag<br>
D flag &lt;--- PCC<br>
PCE&nbsp;&nbsp;&nbsp; ---&gt; D flag<br>
<br>
--<br>
First, we rephrased this for clarity - <br>
<br>
&nbsp; The PCE SHOULD<br>
&nbsp; NOT send control request for LSP which is already delegated to the<b=
r>
&nbsp; PCE, i.e. if the D flag is set in the PCUpd message, then C flag<br>
&nbsp; SHOULD NOT be set. If a PCC receives a PCUpd message with D flag set=
<br>
&nbsp; in the LSP object (i.e. LSP is already delegated) and the C flag is<=
br>
&nbsp; also set (i.e. PCE is making a control request), the PCC MUST ignore=
<br>
&nbsp; the C Flag.<br>
<br>
Second, for a delegated LSP, PCE always sends PCUpd with the D flag set unl=
ess it wants revocation of the delegation. Both D and C flag in PCUpd messa=
ge should not be set together. We wanted to have a new flag to independentl=
y indicate 'LSP control request'
 and not overload the existing flag. <br>
<br>
---<br>
Section 4<br>
&nbsp; It should be noted that a legacy implementation of PCC, that does no=
t<br>
&nbsp; understand the C flag in PCUpd message, would simply ignore the flag=
 (and the request to grant control over the LSP). At the same time it would=
 trigger the error condition as specified in [RFC8231] (a PCErr with Error-=
type=3D19 (Invalid Operation) and error-value
 1 (Attempted LSP Update Request for a non-delegated LSP)).<br>
<br>
&nbsp; I looked through 8231 and 8281 and I don't find a discussion of hand=
ling unknown flags. What is missing in 7.2 of 8231 is &quot;Unassigned flag=
s MUST be set to zero on transmission, and unknown flags MUST be ignored on=
 receipt.&quot; I think that without that addition
 to 8231, your text doesn't work.<br>
<br>
---<br>
We rephrased this to say - <br>
<br>
&nbsp; It should be noted that a legacy implementation of PCC, that does no=
t<br>
&nbsp; support this extension would trigger the error condition as specifie=
d<br>
&nbsp; in [RFC8231] (a PCErr with Error-type=3D19 (Invalid Operation) and<b=
r>
&nbsp; error-value 1 (Attempted LSP Update Request for a non-delegated LSP)=
)<br>
&nbsp; as the D flag would be unset in this update request. Further, in<br>
&nbsp; case of PLSP-ID of 0, the error condition as specified in [RFC8231]<=
br>
&nbsp; (a PCErr with Error-type=3D19 (Invalid Operation) and error-value 3<=
br>
&nbsp; (Attempted LSP Update Request for an LSP identified by an unknown<br=
>
&nbsp; PSP-ID)) would be triggered.<br>
<br>
So this I-D can be progressed independently, while the WG decides how to ha=
ndle the missing statement in RFC 8231.
<br>
<br>
Thanks for your review,<br>
Mahendra <br>
<br>
</div>
<div></div>
<div>--------------------------------------------------<br>
Mahendra Singh Negi Mahendra<br>
Mobile: <a href=3D"tel:&#43;91-7204000290">&#43;91-7204000290</a><br>
Email: <a href=3D"mailto:mahendrasingh@huawei.com">mahendrasingh@huawei.com=
</a></div>
<div name=3D"x_AnyOffice-Background-Image" style=3D"border-top:1px solid #B=
5C4DF; padding:8px">
<div style=3D"word-break:break-all"><b>From:</b>Adrian Farrel &lt;adrian@ol=
ddog.co.uk&gt;</div>
<div style=3D"word-break:break-all"><b>To:</b>'Dhruv Dhody' &lt;dhruv.ietf@=
gmail.com&gt;;pce@ietf.org &lt;pce@ietf.org&gt;</div>
<div style=3D"word-break:break-all"><b>Cc:</b>draft-ietf-pce-lsp-control-re=
quest@ietf.org &lt;draft-ietf-pce-lsp-control-request@ietf.org&gt;</div>
<div style=3D"word-break:break-all"><b>Date:</b>2019-06-17 21:17:02</div>
<div style=3D"word-break:break-all"><b>Subject:</b>RE: [Pce] WG LC for draf=
t-ietf-pce-lsp-control-request-04</div>
<div><br>
</div>
</div>
</div>
<font size=3D"2"><span style=3D"font-size:10pt;">
<div class=3D"PlainText">Hi,<br>
<br>
Picking up on Dhruv's request, I did a quick review as co-chair. It's<br>
after the end of WG last call, but life is full of little<br>
disappointments.<br>
<br>
Enjoy!<br>
<br>
Adrian<br>
<br>
=3D=3D=3D<br>
<br>
Please reduce to five or fewer authors on the front page or provide the<br>
shepherd with a good reason why not.<br>
<br>
---<br>
<br>
Please expand &quot;LSP&quot; in the document title.<br>
<br>
---<br>
<br>
I found the Abstract a bit hard to work through. How about...<br>
<br>
&nbsp;&nbsp; A stateful Path Computation Element (PCE) retains information =
about<br>
&nbsp;&nbsp; the placement of MPLS-TE Label Switched Paths (LSPs). When a P=
CE has<br>
&nbsp;&nbsp; stateful control over LSPs it may send indications to LSP head=
-ends <br>
&nbsp;&nbsp; to modify the attributes (especially the paths) of the LSPs. A=
 Path<br>
&nbsp;&nbsp; Computation Client (PCC) has set up LSPs under local<br>
&nbsp;&nbsp; configuration may delegate control of those LSPs to a stateful=
 PCE.<br>
<br>
&nbsp;&nbsp; There are use-cases in which a stateful PCE may wish to obtain=
 <br>
&nbsp;&nbsp; control of locally configured LSPs of which it is aware but th=
at have<br>
&nbsp;&nbsp; not been delegated to the PCE.<br>
<br>
&nbsp;&nbsp; This document describes an extension to the Path Computation E=
lement<br>
&nbsp;&nbsp; communication Protocol (PCEP) to enable a PCE to make such req=
uests.<br>
<br>
---<br>
<br>
Please expand abbreviations on first use in the body of the document<br>
(even if they have already been used in the Abstract). I found:<br>
- PCEP<br>
- TE LSP<br>
- PCC<br>
- PCE<br>
<br>
---<br>
<br>
You need to move the block of text &quot;Requirements Language&quot; down t=
o <br>
after the Introduction. Probably create a Section 2.1 for it.<br>
<br>
That is also consistent with it not being appropriate to use <br>
Requirements Language in the Introduction. (You have just one &quot;MAY&quo=
t; <br>
which can safely be made lower case.)<br>
<br>
---<br>
<br>
Section 3<br>
<br>
s/a R/an R/<br>
s/LSP(s)/LSPs/<br>
<br>
OLD<br>
&nbsp;&nbsp; The LSP is identified by the LSP object.<br>
NEW&nbsp;&nbsp; <br>
&nbsp;&nbsp; The LSPs are identified by the LSP object.<br>
END<br>
&nbsp;&nbsp; <br>
---<br>
<br>
Section 3 has...<br>
<br>
&nbsp;&nbsp; [RFC8281] defines a R (LSP-REMOVE) flag.<br>
<br>
This is true, but not very relevant. You don't mention the R flag <br>
anywhere else.<br>
<br>
Maybe just delete this?<br>
<br>
---<br>
<br>
Section 4<br>
<br>
OLD<br>
&nbsp;&nbsp; LSP(s) is/are<br>
NEW<br>
&nbsp;&nbsp; LSPs are<br>
END<br>
<br>
s/[RFC8231] ./[RFC8231]./<br>
<br>
---<br>
<br>
Section 4<br>
<br>
&nbsp;&nbsp; If the LSP(s) is/are already delegated to the PCE making<br>
&nbsp;&nbsp; the request, the PCC ignores the C Flag.<br>
<br>
Doesn't this over-complicate things? Why not have the PCE always <br>
respond with D set or clear depending on whether it wants to have <br>
delegated? That way, a PCE that drops context (i.e., does it have <br>
control or not?) is able to regain context.<br>
<br>
Or are you trying to prevent a thrash where...<br>
PCE ---&gt; C flag<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D flag &lt;--- PCC<br>
PCE ---&gt; D flag and C flag<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D flag &lt;--- PCC<br>
PCE ---&gt; D flag and C flag<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; etc.<br>
&nbsp;&nbsp; <br>
I see you don't give the PCE advice about not setting the C flag for<br>
LSPs it already has delegate control over. That would lead to...<br>
<br>
PCE ---&gt; C flag<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D flag &lt;--- PCC<br>
PCE ---&gt; D flag <br>
<br>
---<br>
<br>
Section 4<br>
<br>
&nbsp;&nbsp; In case multiple PCEs request control over an LSP, and if the =
PCC is<br>
&nbsp;&nbsp; willing to grant the control, the LSP MUST be delegated to onl=
y one<br>
&nbsp;&nbsp; PCE chosen by the PCC based on its local policy.<br>
<br>
This might be clearer as...<br>
<br>
&nbsp;&nbsp; A PCC MUST NOT delegate an LSP to more than one PCE at any tim=
e.&nbsp; If<br>
&nbsp;&nbsp; a PCE requests control of an LSP that has already been delegat=
ed by<br>
&nbsp;&nbsp; the PCC to another PCE, the PCE MAY ignore the request, or MAY=
 revoke<br>
&nbsp;&nbsp; the delegation to the first PCE before delegating it to the se=
cond.<br>
&nbsp;&nbsp; This choice is a matter of local policy.<br>
<br>
---<br>
<br>
Section 4<br>
<br>
&nbsp;&nbsp; It should be noted that a legacy implementation of PCC, that d=
oes not<br>
&nbsp;&nbsp; understand the C flag in PCUpd message, would simply ignore th=
e flag<br>
&nbsp;&nbsp; (and the request to grant control over the LSP).&nbsp; At the =
same time it<br>
&nbsp;&nbsp; would trigger the error condition as specified in [RFC8231] (a=
 PCErr<br>
&nbsp;&nbsp; with Error-type=3D19 (Invalid Operation) and error-value 1 (At=
tempted<br>
&nbsp;&nbsp; LSP Update Request for a non-delegated LSP)).<br>
<br>
I looked through 8231 and 8281 and I don't find a discussion of handling<br=
>
unknown flags. What is missing in 7.2 of 8231 is &quot;Unassigned flags MUS=
T<br>
be set to zero on transmission, and unknown flags MUST be ignored on<br>
receipt.&quot; I think that without that addition to 8231, your text doesn'=
t<br>
work.<br>
<br>
---<br>
<br>
Section 6<br>
<br>
s/vectors/vector/<br>
<br>
---<br>
<br>
Section 7.1<br>
<br>
It would be good if you could help IANA correctly identify the registry<br>
you want actioned. I think this is...<br>
<br>
&nbsp;&nbsp; IANA maintains a registry called the &quot;Path Computation El=
ement<br>
&nbsp;&nbsp; Protocol (PCEP) Numbers&quot; registry.&nbsp; It contains a su=
bregistry called<br>
&nbsp;&nbsp; the &quot;SRP Object Flag Field&quot; registry.<br>
<br>
I note that the current registry reads...<br>
<br>
&nbsp;&nbsp; Value Description Reference<br>
&nbsp;&nbsp; 0-30&nbsp; Unassigned&nbsp; [RFC8281]<br>
&nbsp;&nbsp;&nbsp; 31&nbsp;&nbsp; LSP-Remove&nbsp; [RFC8281]<br>
<br>
...so your proposed description for the c-bit is a bit lengthy.<br>
<br>
---<br>
<br>
Section 8.1<br>
<br>
There is a further policy described in the document: that of deciding <br>
which of a pair of delegation requests to honour.<br>
<br>
---<br>
<br>
Not sure whether it belongs in 8.1 or 8.3...<br>
The PCE that sends a delegation request and doesn't get a response &quot;ma=
y<br>
choose to retry requesting the control preferably using exponentially <br>
increasing timer.&quot; That implies a timer that should be configurable.<b=
r>
<br>
---<br>
<br>
Not sure whether it belongs in 8.1 or 8.3 or 7...<br>
The Security considerations section suggests dropping delegation <br>
requests if the PCC is swamped. I think you need to configure the <br>
threshold for swamping, and to recommend that the issue be logged.<br>
<br>
-----Original Message-----<br>
From: Pce &lt;pce-bounces@ietf.org&gt; On Behalf Of Dhruv Dhody<br>
Sent: 17 June 2019 11:02<br>
To: pce@ietf.org<br>
Cc: draft-ietf-pce-lsp-control-request@ietf.org<br>
Subject: Re: [Pce] WG LC for draft-ietf-pce-lsp-control-request-04<br>
<br>
Hi WG,<br>
<br>
The WG LC ends in 2 days. We would like to see some more responses before w=
e<br>
make the consensuses call. Please confirm if the document is ready to be<br=
>
sent<br>
to the IESG. Detailed comments are always welcome!<br>
<br>
Thanks!<br>
Dhruv<br>
<br>
On Tue, Jun 4, 2019 at 9:56 PM Dhruv Dhody &lt;dhruv.ietf@gmail.com&gt; wro=
te:<br>
&gt;<br>
&gt; Hi WG,<br>
&gt;<br>
&gt; This email starts a working group last call for<br>
&gt; draft-ietf-pce-lsp-control-request-04. The WG LC will run for 2 weeks,=
<br>
till<br>
&gt; 19th June 2019.<br>
&gt;<br>
&gt; <a href=3D"https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-control=
-request/">
https://datatracker.ietf.org/doc/draft-ietf-pce-lsp-control-request/</a><br=
>
&gt;<br>
&gt; Please indicate your support or concern for this draft.<br>
&gt;<br>
&gt; If you are opposed to the progression of the draft, please articulate =
your<br>
&gt; concern.<br>
&gt;<br>
&gt; If you support, please indicate that you have read the latest version =
and<br>
&gt; it is ready for publication. Further, explaining the importance of the=
<br>
work in<br>
&gt; your opinion is appreciated.<br>
&gt;<br>
&gt; As always, review comments and nits are most welcome. Silence on the l=
ist,<br>
not<br>
&gt; so much :)<br>
&gt;<br>
&gt; Thanks,<br>
&gt; Dhruv, Julien, &amp; Adrian<br>
<br>
_______________________________________________<br>
Pce mailing list<br>
Pce@ietf.org<br>
<a href=3D"https://www.ietf.org/mailman/listinfo/pce">https://www.ietf.org/=
mailman/listinfo/pce</a><br>
<br>
</div>
</span></font>
</body>
</html>

--_000_4061DD7DA170439E9F524A52DD48743B_--


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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: <pce@ietf.org>
Date: Mon, 24 Jun 2019 08:04:09 +0100
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Subject: [Pce] New draft draft-farrel-pce-stateful-flags-00.txt
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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>=20
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.t=
xt
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.

                                                                         =
        =20


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


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Hi Authors,

In preparation for the upcoming WG adoption call, I did a quick review of your
I-D to tidy things up. At this stage we need to make sure that I-D is in good
enough state as a base of further work by the WG if adopted.

(1) 6 authors on the front page, better to handle this now itself, rather than
much later in the process.

(2) Add Implementation Status as per the WG policy. I assume there are
implementations of this work?

(3) Start work on the 'Manageability Considerations' section. Currently it is
marked TBD.

(4) This document includes details about reporting BSID for a path. What
happens when PCE creates a SR path (SR-ERO) that includes a BSID. This detail
is currently missing, we need to a clarity on how to encode a BSID in SR-ERO
and the best place is this document.

My guess would be to say no NAI in case of BSID in SR-ERO and confirm how the
flags should be set for both SR-MPLS and SRv6.

(5) Add reference to Section 6.4 of [I-D.ietf-spring-segment-routing-policy]
for non-SR use of BSID.

(6) Why use 'label/SID' in this I-D? Please check in spring what would be the
best practice can it just be SID?

(7) Security Consideration is bit week. You have a way for PCE to assign BSID
and this needs to be analysed for potential exploitation.

(8) Update Section 6.1.1 to include SRv6

(9) Remove this sentence from section 1 - "However, use of this TLV for
carrying non-MPLS binding SID will be described in separate document(s)."; as
you support SRv6. Similarly, reword section 3, 2nd paragraph.

Note that these are non-blocking comments for WG adoption but it would be
great, if the authors publish a revision handling these.

Thanks!
Dhruv


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From: "Siva Sivabalan (msiva)" <msiva@cisco.com>
To: 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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Subject: Re: [Pce] Chair's pre-adoption review of draft-sivabalan-pce-binding-label-sid-06
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Subject: [Pce] Building the PCE WG Agenda for the IETF 105
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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/

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D""><font face=3D"verd=
ana, sans-serif" style=3D"">Hi WG,<br style=3D""><br style=3D"">The PCE WG =
session in Montreal is tentatively scheduled for Thursday<br style=3D"">Mor=
ning session I [1]. If you need some face-to-face time to progress<br style=
=3D"">some work, please send a slot request to the chairs by Monday July<br=
 style=3D"">8th including:<br style=3D"">- the draft(s) you want to discuss=
,<br style=3D"">- the expected presenter name,<br style=3D"">- the requeste=
d duration, including question time as part of the slot,<br style=3D"">- th=
e reason why you want to be on the agenda; What do you want to<br style=3D"=
">achieve? Why is a presentation necessary to achieve it?<br style=3D""><br=
 style=3D"">Please note - Asking for a slot does not mean you will get one.=
 We<br style=3D"">will be prioritizing=C2=A0moving WG work first as well as=
 drafts that were<br style=3D"">discussed on the mailing list. Please make =
sure to introduce your new<br style=3D"">draft or summarize an update in th=
e mailing list. The last date to<br style=3D"">submit drafts is also July 8=
th [2].<br style=3D""><br style=3D"">Thanks!<br style=3D"">PCE Chairs &amp;=
 Secretary<br style=3D""><br style=3D"">[1]=C2=A0<a href=3D"https://datatra=
cker.ietf.org/meeting/105/agenda.html" rel=3D"noreferrer" target=3D"_blank"=
 style=3D"">https://datatracker.ietf.org/meeting/105/agenda.html</a><br sty=
le=3D"">[2]=C2=A0<a href=3D"https://datatracker.ietf.org/meeting/important-=
dates/" rel=3D"noreferrer" target=3D"_blank" style=3D"">https://datatracker=
.ietf.org/meeting/important-dates/</a></font><br></div></div>

--000000000000752714058c13a8aa--


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Date: Mon, 24 Jun 2019 18:31:56 -0700
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Subject: [Pce] Shepherd Review of draft-ietf-pce-lsp-control-request-05
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-------
Header:
In general should we use "Stateful PCE" or "stateful PCE" ? I see in RFC
8231 we use "Stateful PCE"

OLD:
Ability for a stateful Path Computation Element (PCE)

NEW:
Ability for a Stateful Path Computation Element (PCE)

--------
Abstract:
OLD:
A stateful Path Computation Element (PCE)

NEW:
A Stateful Path Computation Element (PCE)

-------------
Section 4:
To make it more clear, it would be good to state that C and D flags are
mutually exclusive in PCUpd message.

OLD:

The PCE SHOULD NOT send control request for LSP which is already
delegated to the
PCE, i.e. if the D flag is set in the PCUpd message, then C flag
SHOULD NOT be set.


NEW:

The D Flag and C Flag are mutually exclusive in PCUpd message. The PCE
SHOULD NOT

send control request for LSP which is already delegated to thePCE, i.e. if

the D flag is set in the PCUpd message, then C flag SHOULD NOT be set.


--------------

I dont see Adrian's suggestion being implemented in Section 8 in the
latest draft. It would be good to have this apart from the Security
Considerations.


SUGGESTED:

Not sure whether it belongs in 8.1 or 8.3 or 7...
The Security considerations section suggests dropping delegation
requests if the PCC is swamped. I think you need to configure the
threshold for swamping, and to recommend that the issue be logged.

IMPLEMENTED:

-----------------

Thanks,
Hari

--00000000000091964b058c1be58c
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D""><div class=3D"gmai=
l_default" style=3D""><font face=3D"verdana, sans-serif" style=3D"">-------=
</font></div><div class=3D"gmail_default" style=3D""><font face=3D"verdana,=
 sans-serif">Header:</font></div><div class=3D"gmail_default" style=3D""><f=
ont face=3D"verdana, sans-serif">In general should we use &quot;Stateful PC=
E&quot; or &quot;stateful PCE&quot; ? I see in RFC 8231 we use &quot;Statef=
ul PCE&quot;=C2=A0</font></div><div class=3D"gmail_default" style=3D""><fon=
t face=3D"verdana, sans-serif"><br></font></div><div class=3D"gmail_default=
" style=3D""><font face=3D"verdana, sans-serif">OLD:</font></div><div class=
=3D"gmail_default" style=3D""><font face=3D"verdana, sans-serif">Ability fo=
r a stateful Path Computation Element (PCE)</font></div><div class=3D"gmail=
_default" style=3D""><font face=3D"verdana, sans-serif"><br></font></div><d=
iv class=3D"gmail_default" style=3D""><font face=3D"verdana, sans-serif">NE=
W:</font></div><div class=3D"gmail_default" style=3D""><font face=3D"verdan=
a, sans-serif">Ability for a Stateful Path Computation Element (PCE)</font>=
</div><div class=3D"gmail_default" style=3D""><font face=3D"verdana, sans-s=
erif"><br></font></div><div class=3D"gmail_default" style=3D""><font face=
=3D"verdana, sans-serif">--------</font></div><div class=3D"gmail_default" =
style=3D""><font face=3D"verdana, sans-serif">Abstract:</font></div><div cl=
ass=3D"gmail_default" style=3D""><font face=3D"verdana, sans-serif">OLD:</f=
ont></div><div class=3D"gmail_default" style=3D""><font face=3D"verdana, sa=
ns-serif">A stateful Path Computation Element (PCE)</font></div><div class=
=3D"gmail_default" style=3D""><font face=3D"verdana, sans-serif"><br></font=
></div><div class=3D"gmail_default" style=3D""><font face=3D"verdana, sans-=
serif">NEW:</font></div><div class=3D"gmail_default" style=3D""><font face=
=3D"verdana, sans-serif">A Stateful Path Computation Element (PCE)</font></=
div><div class=3D"gmail_default" style=3D""><font face=3D"verdana, sans-ser=
if"><br></font></div><div class=3D"gmail_default" style=3D""><font face=3D"=
verdana, sans-serif">-------------</font></div><div class=3D"gmail_default"=
 style=3D""><div class=3D"gmail_default" style=3D""><font face=3D"verdana, =
sans-serif">Section 4:</font></div><div class=3D"gmail_default" style=3D"">=
<font face=3D"verdana, sans-serif">To make it more clear, it would be good =
to state that C and D flags are mutually exclusive in PCUpd message.</font>=
</div><div class=3D"gmail_default" style=3D""><font face=3D"verdana, sans-s=
erif"><br></font></div><div class=3D"gmail_default" style=3D""><font face=
=3D"verdana, sans-serif">OLD:</font></div><div class=3D"gmail_default" styl=
e=3D""><pre class=3D"gmail-m_-748586319158213843gmail-newpage" style=3D"whi=
te-space:pre-wrap;margin-top:0px;margin-bottom:0px;break-before:page;color:=
rgb(0,0,0)"><font face=3D"verdana, sans-serif">The PCE SHOULD NOT send cont=
rol request for LSP which is already delegated to the
PCE, i.e. if the D flag is set in the PCUpd message, then C flag SHOULD NOT=
 be set.</font></pre><pre class=3D"gmail-m_-748586319158213843gmail-newpage=
" style=3D"white-space:pre-wrap;margin-top:0px;margin-bottom:0px;break-befo=
re:page;color:rgb(0,0,0)"><font face=3D"verdana, sans-serif"><br></font></p=
re><pre class=3D"gmail-m_-748586319158213843gmail-newpage" style=3D"white-s=
pace:pre-wrap;margin-top:0px;margin-bottom:0px;break-before:page;color:rgb(=
0,0,0)"><font face=3D"verdana, sans-serif">NEW:</font></pre><pre class=3D"g=
mail-m_-748586319158213843gmail-newpage" style=3D"white-space:pre-wrap;marg=
in-top:0px;margin-bottom:0px;break-before:page;color:rgb(0,0,0)"><pre class=
=3D"gmail-m_-748586319158213843gmail-newpage" style=3D"white-space:pre-wrap=
;margin-top:0px;margin-bottom:0px;break-before:page"><font face=3D"verdana,=
 sans-serif">The D Flag and C Flag are mutually exclusive in PCUpd message.=
 The PCE SHOULD NOT </font></pre><pre class=3D"gmail-m_-748586319158213843g=
mail-newpage" style=3D"white-space:pre-wrap;margin-top:0px;margin-bottom:0p=
x;break-before:page"><font face=3D"verdana, sans-serif">send control reques=
t for LSP which is already delegated to thePCE, i.e. if </font></pre><pre c=
lass=3D"gmail-m_-748586319158213843gmail-newpage" style=3D"white-space:pre-=
wrap;margin-top:0px;margin-bottom:0px;break-before:page"><font face=3D"verd=
ana, sans-serif">the D flag is set in the PCUpd message, then C flag SHOULD=
 NOT be set. </font></pre><pre class=3D"gmail-m_-748586319158213843gmail-ne=
wpage" style=3D"white-space:pre-wrap;margin-top:0px;margin-bottom:0px;break=
-before:page"><font face=3D"verdana, sans-serif"><br></font></pre></pre><pr=
e class=3D"gmail-m_-748586319158213843gmail-newpage" style=3D"margin-top:0p=
x;margin-bottom:0px;break-before:page"><pre class=3D"gmail-m_-7485863191582=
13843gmail-wordwrap" style=3D"box-sizing:border-box;margin-top:0px;margin-b=
ottom:1rem;overflow:auto;word-break:normal;padding:0px"><pre class=3D"gmail=
-m_-748586319158213843gmail-newpage" style=3D"color:rgb(0,0,0);white-space:=
pre-wrap;margin-top:0px;margin-bottom:0px;break-before:page"><font face=3D"=
verdana, sans-serif">--------------</font></pre><pre class=3D"gmail-m_-7485=
86319158213843gmail-newpage" style=3D"margin-top:0px;margin-bottom:0px;brea=
k-before:page"><font face=3D"verdana, sans-serif" style=3D""><font color=3D=
"#000000"><span style=3D"white-space:pre-wrap">I dont see Adrian&#39;s sugg=
estion being implemented in Section 8 in the latest draft. It would be good=
 to have this apart from the Security </span></font><font color=3D"#000000"=
><span style=3D"white-space:pre-wrap">Considerations</span></font><font col=
or=3D"#000000"><span style=3D"white-space:pre-wrap">.</span></font></font><=
/pre><pre class=3D"gmail-m_-748586319158213843gmail-newpage" style=3D"color=
:rgb(0,0,0);white-space:pre-wrap;margin-top:0px;margin-bottom:0px;break-bef=
ore:page"><font face=3D"verdana, sans-serif"><br></font></pre><pre class=3D=
"gmail-m_-748586319158213843gmail-newpage" style=3D"color:rgb(0,0,0);white-=
space:pre-wrap;margin-top:0px;margin-bottom:0px;break-before:page"><font fa=
ce=3D"verdana, sans-serif">SUGGESTED:</font></pre><pre class=3D"gmail-m_-74=
8586319158213843gmail-newpage" style=3D"color:rgb(0,0,0);white-space:pre-wr=
ap;margin-top:0px;margin-bottom:0px;break-before:page"><pre class=3D"gmail-=
m_-748586319158213843gmail-wordwrap" style=3D"white-space:pre-wrap;box-sizi=
ng: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">No=
t sure whether it belongs in 8.1 or 8.3 or 7...
The Security considerations section suggests dropping delegation=20
requests if the PCC is swamped. I think you need to configure the=20
threshold for swamping, and to recommend that the issue be logged.</font></=
pre><pre class=3D"gmail-m_-748586319158213843gmail-wordwrap" style=3D"white=
-space:pre-wrap;box-sizing:border-box;margin-top:0px;margin-bottom:1rem;ove=
rflow:auto;color:rgb(33,37,41);word-break:normal;padding:0px"><font face=3D=
"verdana, sans-serif">IMPLEMENTED:</font></pre><pre class=3D"gmail-m_-74858=
6319158213843gmail-wordwrap" style=3D"white-space:pre-wrap;box-sizing:borde=
r-box;margin-top:0px;margin-bottom:1rem;overflow:auto;color:rgb(33,37,41);w=
ord-break:normal;padding:0px"><font face=3D"verdana, sans-serif">----------=
-------</font></pre><pre class=3D"gmail-m_-748586319158213843gmail-wordwrap=
" style=3D"white-space:pre-wrap;box-sizing:border-box;margin-top:0px;margin=
-bottom:1rem;overflow:auto;color:rgb(33,37,41);word-break:normal;padding:0p=
x"><font face=3D"verdana, sans-serif" style=3D"">Thanks,
Hari</font></pre></pre></pre></pre></div></div></div></div>

--00000000000091964b058c1be58c--


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From: Hariharan Ananthakrishnan <hari@netflix.com>
Date: Mon, 24 Jun 2019 18:39:02 -0700
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To: pce@ietf.org, ar2521@att.com, ag6941@att.com, jakarthi@cisco.com,  "Siva Sivabalan (msiva)" <msiva@cisco.com>, mahendrasingh@huawei.com
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Subject: Re: [Pce] Shepherd Review of draft-ietf-pce-lsp-control-request-05
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+ Authors.

On Mon, Jun 24, 2019 at 6:31 PM Hariharan Ananthakrishnan <hari@netflix.com>
wrote:

> -------
> Header:
> In general should we use "Stateful PCE" or "stateful PCE" ? I see in RFC
> 8231 we use "Stateful PCE"
>
> OLD:
> Ability for a stateful Path Computation Element (PCE)
>
> NEW:
> Ability for a Stateful Path Computation Element (PCE)
>
> --------
> Abstract:
> OLD:
> A stateful Path Computation Element (PCE)
>
> NEW:
> A Stateful Path Computation Element (PCE)
>
> -------------
> Section 4:
> To make it more clear, it would be good to state that C and D flags are
> mutually exclusive in PCUpd message.
>
> OLD:
>
> The PCE SHOULD NOT send control request for LSP which is already delegated to the
> PCE, i.e. if the D flag is set in the PCUpd message, then C flag SHOULD NOT be set.
>
>
> NEW:
>
> The D Flag and C Flag are mutually exclusive in PCUpd message. The PCE SHOULD NOT
>
> send control request for LSP which is already delegated to thePCE, i.e. if
>
> the D flag is set in the PCUpd message, then C flag SHOULD NOT be set.
>
>
> --------------
>
> I dont see Adrian's suggestion being implemented in Section 8 in the latest draft. It would be good to have this apart from the Security Considerations.
>
>
> SUGGESTED:
>
> Not sure whether it belongs in 8.1 or 8.3 or 7...
> The Security considerations section suggests dropping delegation
> requests if the PCC is swamped. I think you need to configure the
> threshold for swamping, and to recommend that the issue be logged.
>
> IMPLEMENTED:
>
> -----------------
>
> Thanks,
> Hari
>
>

--000000000000fa656e058c1bfe8b
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<div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fon=
t-family:verdana,sans-serif;font-size:small">+ Authors.<br></div></div><br>=
<div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Ju=
n 24, 2019 at 6:31 PM Hariharan Ananthakrishnan &lt;<a href=3D"mailto:hari@=
netflix.com">hari@netflix.com</a>&gt; wrote:<br></div><blockquote class=3D"=
gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(20=
4,204,204);padding-left:1ex"><div dir=3D"ltr"><div><div><font face=3D"verda=
na, sans-serif">-------</font></div><div><font face=3D"verdana, sans-serif"=
>Header:</font></div><div><font face=3D"verdana, sans-serif">In general sho=
uld we use &quot;Stateful PCE&quot; or &quot;stateful PCE&quot; ? I see in =
RFC 8231 we use &quot;Stateful PCE&quot;=C2=A0</font></div><div><font face=
=3D"verdana, sans-serif"><br></font></div><div><font face=3D"verdana, sans-=
serif">OLD:</font></div><div><font face=3D"verdana, sans-serif">Ability for=
 a stateful Path Computation Element (PCE)</font></div><div><font face=3D"v=
erdana, sans-serif"><br></font></div><div><font face=3D"verdana, sans-serif=
">NEW:</font></div><div><font face=3D"verdana, sans-serif">Ability for a St=
ateful Path Computation Element (PCE)</font></div><div><font face=3D"verdan=
a, sans-serif"><br></font></div><div><font face=3D"verdana, sans-serif">---=
-----</font></div><div><font face=3D"verdana, sans-serif">Abstract:</font><=
/div><div><font face=3D"verdana, sans-serif">OLD:</font></div><div><font fa=
ce=3D"verdana, sans-serif">A stateful Path Computation Element (PCE)</font>=
</div><div><font face=3D"verdana, sans-serif"><br></font></div><div><font f=
ace=3D"verdana, sans-serif">NEW:</font></div><div><font face=3D"verdana, sa=
ns-serif">A Stateful Path Computation Element (PCE)</font></div><div><font =
face=3D"verdana, sans-serif"><br></font></div><div><font face=3D"verdana, s=
ans-serif">-------------</font></div><div><div><font face=3D"verdana, sans-=
serif">Section 4:</font></div><div><font face=3D"verdana, sans-serif">To ma=
ke it more clear, it would be good to state that C and D flags are mutually=
 exclusive in PCUpd message.</font></div><div><font face=3D"verdana, sans-s=
erif"><br></font></div><div><font face=3D"verdana, sans-serif">OLD:</font><=
/div><div><pre class=3D"gmail-m_2433375147103745156gmail-m_-748586319158213=
843gmail-newpage" style=3D"white-space:pre-wrap;margin-top:0px;margin-botto=
m:0px;break-before:page;color:rgb(0,0,0)"><font face=3D"verdana, sans-serif=
">The PCE SHOULD NOT send control request for LSP which is already delegate=
d to the
PCE, i.e. if the D flag is set in the PCUpd message, then C flag SHOULD NOT=
 be set.</font></pre><pre class=3D"gmail-m_2433375147103745156gmail-m_-7485=
86319158213843gmail-newpage" style=3D"white-space:pre-wrap;margin-top:0px;m=
argin-bottom:0px;break-before:page;color:rgb(0,0,0)"><font face=3D"verdana,=
 sans-serif"><br></font></pre><pre class=3D"gmail-m_2433375147103745156gmai=
l-m_-748586319158213843gmail-newpage" style=3D"white-space:pre-wrap;margin-=
top:0px;margin-bottom:0px;break-before:page;color:rgb(0,0,0)"><font face=3D=
"verdana, sans-serif">NEW:</font></pre><pre class=3D"gmail-m_24333751471037=
45156gmail-m_-748586319158213843gmail-newpage" style=3D"white-space:pre-wra=
p;margin-top:0px;margin-bottom:0px;break-before:page;color:rgb(0,0,0)"><pre=
 class=3D"gmail-m_2433375147103745156gmail-m_-748586319158213843gmail-newpa=
ge" style=3D"white-space:pre-wrap;margin-top:0px;margin-bottom:0px;break-be=
fore:page"><font face=3D"verdana, sans-serif">The D Flag and C Flag are mut=
ually exclusive in PCUpd message. The PCE SHOULD NOT </font></pre><pre clas=
s=3D"gmail-m_2433375147103745156gmail-m_-748586319158213843gmail-newpage" s=
tyle=3D"white-space:pre-wrap;margin-top:0px;margin-bottom:0px;break-before:=
page"><font face=3D"verdana, sans-serif">send control request for LSP which=
 is already delegated to thePCE, i.e. if </font></pre><pre class=3D"gmail-m=
_2433375147103745156gmail-m_-748586319158213843gmail-newpage" style=3D"whit=
e-space:pre-wrap;margin-top:0px;margin-bottom:0px;break-before:page"><font =
face=3D"verdana, sans-serif">the D flag is set in the PCUpd message, then C=
 flag SHOULD NOT be set. </font></pre><pre class=3D"gmail-m_243337514710374=
5156gmail-m_-748586319158213843gmail-newpage" style=3D"white-space:pre-wrap=
;margin-top:0px;margin-bottom:0px;break-before:page"><font face=3D"verdana,=
 sans-serif"><br></font></pre></pre><pre class=3D"gmail-m_24333751471037451=
56gmail-m_-748586319158213843gmail-newpage" style=3D"margin-top:0px;margin-=
bottom:0px;break-before:page"><pre class=3D"gmail-m_2433375147103745156gmai=
l-m_-748586319158213843gmail-wordwrap" style=3D"box-sizing:border-box;margi=
n-top:0px;margin-bottom:1rem;overflow:auto;word-break:normal;padding:0px"><=
pre class=3D"gmail-m_2433375147103745156gmail-m_-748586319158213843gmail-ne=
wpage" style=3D"color:rgb(0,0,0);white-space:pre-wrap;margin-top:0px;margin=
-bottom:0px;break-before:page"><font face=3D"verdana, sans-serif">---------=
-----</font></pre><pre class=3D"gmail-m_2433375147103745156gmail-m_-7485863=
19158213843gmail-newpage" style=3D"margin-top:0px;margin-bottom:0px;break-b=
efore:page"><font face=3D"verdana, sans-serif"><font color=3D"#000000"><spa=
n style=3D"white-space:pre-wrap">I dont see Adrian&#39;s suggestion being i=
mplemented in Section 8 in the latest draft. It would be good to have this =
apart from the Security </span></font><font color=3D"#000000"><span style=
=3D"white-space:pre-wrap">Considerations</span></font><font color=3D"#00000=
0"><span style=3D"white-space:pre-wrap">.</span></font></font></pre><pre cl=
ass=3D"gmail-m_2433375147103745156gmail-m_-748586319158213843gmail-newpage"=
 style=3D"color:rgb(0,0,0);white-space:pre-wrap;margin-top:0px;margin-botto=
m:0px;break-before:page"><font face=3D"verdana, sans-serif"><br></font></pr=
e><pre class=3D"gmail-m_2433375147103745156gmail-m_-748586319158213843gmail=
-newpage" style=3D"color:rgb(0,0,0);white-space:pre-wrap;margin-top:0px;mar=
gin-bottom:0px;break-before:page"><font face=3D"verdana, sans-serif">SUGGES=
TED:</font></pre><pre class=3D"gmail-m_2433375147103745156gmail-m_-74858631=
9158213843gmail-newpage" style=3D"color:rgb(0,0,0);white-space:pre-wrap;mar=
gin-top:0px;margin-bottom:0px;break-before:page"><pre class=3D"gmail-m_2433=
375147103745156gmail-m_-748586319158213843gmail-wordwrap" style=3D"white-sp=
ace:pre-wrap;box-sizing:border-box;margin-top:0px;margin-bottom:1rem;overfl=
ow:auto;color:rgb(33,37,41);word-break:normal;padding:0px"><font face=3D"ve=
rdana, sans-serif">Not sure whether it belongs in 8.1 or 8.3 or 7...
The Security considerations section suggests dropping delegation=20
requests if the PCC is swamped. I think you need to configure the=20
threshold for swamping, and to recommend that the issue be logged.</font></=
pre><pre class=3D"gmail-m_2433375147103745156gmail-m_-748586319158213843gma=
il-wordwrap" style=3D"white-space:pre-wrap;box-sizing: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">IMPLEMENTED:</font></pre><=
pre class=3D"gmail-m_2433375147103745156gmail-m_-748586319158213843gmail-wo=
rdwrap" style=3D"white-space:pre-wrap;box-sizing:border-box;margin-top:0px;=
margin-bottom:1rem;overflow:auto;color:rgb(33,37,41);word-break:normal;padd=
ing:0px"><font face=3D"verdana, sans-serif">-----------------</font></pre><=
pre class=3D"gmail-m_2433375147103745156gmail-m_-748586319158213843gmail-wo=
rdwrap" style=3D"white-space:pre-wrap;box-sizing:border-box;margin-top:0px;=
margin-bottom:1rem;overflow:auto;color:rgb(33,37,41);word-break:normal;padd=
ing:0px"><font face=3D"verdana, sans-serif">Thanks,
Hari</font></pre></pre></pre></pre></div></div></div></div>
</blockquote></div></div>

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Subject: [Pce] I-D Action: draft-ietf-pce-lsp-control-request-06.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           : Ability for a Stateful Path Computation Element (PCE) to request and obtain control of a Label Switched Path (LSP)
        Authors         : Aswatnarayan Raghuram
                          Al Goddard
                          Jay Karthik
                          Siva Sivabalan
                          Mahendra Singh Negi
	Filename        : draft-ietf-pce-lsp-control-request-06.txt
	Pages           : 12
	Date            : 2019-06-25

Abstract:
   A Stateful Path Computation Element (PCE) retains information about
   the placement of Multiprotocol Label Switching (MPLS) Traffic
   Engineering Label Switched Paths (TE LSPs).  When a PCE has stateful
   control over LSPs it may send indications to LSP head-ends to modify
   the attributes (especially the paths) of the LSPs.  A Path
   Computation Client (PCC) has set up LSPs under local configuration
   may delegate control of those LSPs to a stateful PCE.

   There are use-cases in which a stateful PCE may wish to obtain
   control of locally configured LSPs of which it is aware but that have
   not been delegated to the PCE.

   This document describes an extension to the Path Computation Element
   communication Protocol (PCEP) to enable a PCE to make such requests.


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

There are also htmlized versions available at:
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https://datatracker.ietf.org/doc/html/draft-ietf-pce-lsp-control-request-06

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-lsp-control-request-06


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:
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--_000_a723acbfae5d4d77ae302644425aa8edhuaweicom_--


From nobody Tue Jun 25 10:16:32 2019
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Subject: [Pce] Publication has been requested for draft-ietf-pce-lsp-control-request-06
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Hariharan Ananthakrishnan has requested publication of draft-ietf-pce-lsp-control-request-06 as Proposed Standard on behalf of the PCE working group.

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Subject: [Pce] =?utf-8?q?RFC_8623_on_Stateful_Path_Computation_Element_?= =?utf-8?q?=28PCE=29_Protocol_Extensions_for_Usage_with_Point-to-Multipoin?= =?utf-8?q?t_TE_Label_Switched_Paths_=28LSPs=29?=
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A new Request for Comments is now available in online RFC libraries.

        
        RFC 8623

        Title:      Stateful Path Computation Element (PCE) 
                    Protocol Extensions for Usage with Point-to-Multipoint 
                    TE Label Switched Paths (LSPs) 
        Author:     U. Palle, D. Dhody,
                    Y. Tanaka, V. Beeram
        Status:     Standards Track
        Stream:     IETF
        Date:       June 2019
        Mailbox:    udayasreereddy@gmail.com, 
                    dhruv.ietf@gmail.com, 
                    yosuke.tanaka@ntt.com,  vbeeram@juniper.net
        Pages:      33
        Characters: 71719
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-pce-stateful-pce-p2mp-13.txt

        URL:        https://www.rfc-editor.org/info/rfc8623

        DOI:        10.17487/RFC8623

The Path Computation Element (PCE) has been identified as an
appropriate technology for the determination of the paths of point-
to-multipoint (P2MP) TE Label Switched Paths (LSPs).  This document
provides extensions required for the Path Computation Element
Communication Protocol (PCEP) so as to enable the usage of a stateful
PCE capability in supporting P2MP TE LSPs.

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

This is now a Proposed Standard.

STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the 
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From nobody Fri Jun 28 06:26:55 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>
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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,

Apologies for the late response.

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.)

Thank you,

Julien


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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From nobody Fri Jun 28 08:23:34 2019
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From: <julien.meuric@orange.com>
Organization: Orange
To: "draft-ietf-pce-association-diversity@ietf.org" <draft-ietf-pce-association-diversity@ietf.org>
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Subject: [Pce] Shepherd Review of draft-ietf-pce-association-diversity-07
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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
   [...] the PCE SHOULD
   reply with a PCUpd message containing an empty ERO.  In addition to
   the empty ERO Object, the PCE MAY add the NO-PATH-VECTOR TLV [...]

NEW
    [...] the PCE MUST
   reply to a request (PCEReq) with a PCRep message containing a NO-PATH
   object. In case of network event leading to an impossible strict
   disjointness, the PCE SHOULD send a PCUpd message containing an empty
   ERO to the corresponding PCCs. In addition to the NO-PATH or the
   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.  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
         When unset, PCE is allowed to relax disjointness
         by using either applying a requested objective function or any
         other behavior if no objective function is requested (e.g.:
         using a lower disjoint type (link instead of node) or relaxing
         disjointness constraint fully)
  NEW
         When unset, the PCE is allowed to relax disjointness
         by either applying a requested objective function (cf. section
         4.4 below) or using any other behavior if no objective function
         is requested (e.g. using a lower disjoint type (link instead of
         node) or fully relaxing disjointness constraint).

- s/The flags  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/  [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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From nobody Fri Jun 28 15:59:09 2019
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Subject: [Pce] pce - Requested session has been scheduled for IETF 105
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Dear Dhruv Dhody,

The session(s) that you have requested have been scheduled.
Below is the scheduled session information followed by
the original request. 


    pce Session 1 (2:00 requested)
    Thursday, 25 July 2019, Morning Session I 1000-1200
    Room Name: Centre Ville size: 200
    ---------------------------------------------


iCalendar: https://datatracker.ietf.org/meeting/105/sessions/pce.ics

Request Information:


---------------------------------------------------------
Working Group Name: Path Computation Element
Area Name: Routing Area
Session Requester: Dhruv Dhody

Number of Sessions: 1
Length of Session(s):  2 Hours
Number of Attendees: 75
Conflicts to Avoid: 
 First Priority: spring mpls teas ccamp
 Second Priority: idr lsr rtgarea detnet
 Third Priority: bier bess netconf netmod sfc rtgwg pals opsawg panrg


People who must be present:
  Deborah Brungard
  Julien Meuric
  Dhruv Dhody

Resources Requested:

Special Requests:
  Do not schedule against RTG area BOF (if any)
---------------------------------------------------------


From nobody Fri Jun 28 17:51:46 2019
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Date: Fri, 28 Jun 2019 19:51:25 -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,

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 [...]".

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...

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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