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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Martin Bjorklund <mbj@tail-f.com>, "rkrejci@cesnet.cz" <rkrejci@cesnet.cz>
CC: "yang-doctors@ietf.org" <yang-doctors@ietf.org>, "draft-ietf-rtgwg-routing-types.all@ietf.org" <draft-ietf-rtgwg-routing-types.all@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>
Subject: Re: [yang-doctors] Yangdoctors early review of draft-ietf-rtgwg-routing-types-02
Thread-Topic: [yang-doctors] Yangdoctors early review of draft-ietf-rtgwg-routing-types-02
Thread-Index: AQHSvdDufqoX5seBz0umk6DZy8BZdqHWx2MAgAkaawA=
Date: Mon, 1 May 2017 19:11:33 +0000
Message-ID: <D52CFF97.AC607%acee@cisco.com>
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: =?utf-8?B?UmFkZWsgS3JlasSNw60=?= <rkrejci@cesnet.cz>, "yang-doctors@ietf.org" <yang-doctors@ietf.org>
CC: "rtgwg@ietf.org" <rtgwg@ietf.org>, "draft-ietf-rtgwg-routing-types.all@ietf.org" <draft-ietf-rtgwg-routing-types.all@ietf.org>
Subject: Re: Yangdoctors early review of draft-ietf-rtgwg-routing-types-02
Thread-Topic: Yangdoctors early review of draft-ietf-rtgwg-routing-types-02
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Date: Mon, 1 May 2017 19:16:24 +0000
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From: Henning Rogge <hrogge@gmail.com>
Date: Tue, 2 May 2017 08:49:16 +0200
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Subject: Re: Routing directorate QA review of draft-ietf-rtgwg-yang-vrrp
To: Xufeng Liu <Xufeng_Liu@jabil.com>
Cc: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>,  Athanasios Kyparlis <Athanasios_Kyparlis@jabil.com>, "parikhr@vmware.com" <parikhr@vmware.com>,  "zhangmingui@huawei.com" <zhangmingui@huawei.com>, Routing WG <rtgwg@ietf.org>
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Hi,

yes I think the new changes improve the draft and make it easier to understand.

I wonder if there is a way in YANG to prevent the duplication of all
the fields between "interface" and "interface-state"... putting the
common fields into a section of their own and refer to them twice,
once as "read only" and once "read-writeable".

Henning Rogge

On Fri, Apr 28, 2017 at 10:41 PM, Xufeng Liu <Xufeng_Liu@jabil.com> wrote:
> Hi Henning,
>
> Please review if the attached change proposal is ok.
> Thanks,
> - Xufeng
>
>> -----Original Message-----
>> From: Xufeng Liu
>> Sent: Wednesday, April 26, 2017 9:18 AM
>> To: 'Henning Rogge' <hrogge@gmail.com>
>> Cc: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>; Athanasios
>> Kyparlis <Athanasios_Kyparlis@jabil.com>; parikhr@vmware.com;
>> zhangmingui@huawei.com; Routing WG <rtgwg@ietf.org>
>> Subject: RE: Routing directorate QA review of draft-ietf-rtgwg-yang-vrrp
>>
>> Hi Henning,
>>
>> Yes. We will add some explanations.
>> Thanks,
>> - Xufeng
>>
>> > -----Original Message-----
>> > From: Henning Rogge [mailto:hrogge@gmail.com]
>> > Sent: Tuesday, April 25, 2017 9:50 AM
>> > To: Xufeng Liu <Xufeng_Liu@jabil.com>
>> > Cc: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>; Athanasios
>> > Kyparlis <Athanasios_Kyparlis@jabil.com>; parikhr@vmware.com;
>> > zhangmingui@huawei.com; Routing WG <rtgwg@ietf.org>
>> > Subject: Re: Routing directorate QA review of
>> > draft-ietf-rtgwg-yang-vrrp
>> >
>> > On Tue, Apr 25, 2017 at 3:47 PM, Xufeng Liu <Xufeng_Liu@jabil.com> wrote:
>> > >
>> > > Hi Henning,
>> > >
>> > >
>> > >
>> > > Thank you much for the review.
>> > >
>> > >
>> > >
>> > > You are right about the mapping for "address of the virtual router".
>> > > The
>> > existing YANG data model for configuring and managing IP addresses is
>> > RFC7277, which augments the ietf-interfaces model specified by
>> > RFC7223. This VRRP model follows the same paradigm. Such a structure
>> > is also VRRP protocols are usually implemented.
>> >
>> > Maybe the naming of the variables or the explanation of them could be
>> > improved to explicitly state this.
>> >
>> > Henning
>> >
>> > >
>> > >
>> > >
>> > > We will fix the error in  Appendix A. in the next revision.
>> > >
>> > >
>> > >
>> > > Regards,
>> > >
>> > > - Xufeng
>> > >
>> > >
>> > >
>> > > From: Henning Rogge [mailto:hrogge@gmail.com]
>> > > Sent: Monday, April 24, 2017 3:41 AM
>> > > To: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>; Xufeng Liu
>> > > <Xufeng_Liu@jabil.com>; Athanasios Kyparlis
>> > > <Athanasios_Kyparlis@jabil.com>; parikhr@vmware.com;
>> > > zhangmingui@huawei.com
>> > > Cc: Routing WG <rtgwg@ietf.org>
>> > > Subject: Re: Routing directorate QA review of
>> > > draft-ietf-rtgwg-yang-vrrp
>> > >
>> > >
>> > >
>> > > Hi,
>> > >
>> > >
>> > >
>> > > Jonathan Hardwick asked me to do an early review of the
>> > > draft-ietf-rtgwg-
>> > yang-vrrp document (currently revision 02) for the routing directorate.
>> > >
>> > >
>> > >
>> > > The draft itself is pretty straight forward and compact, especially
>> > > when you
>> > consider that a lot of text has to be repeated two or four times
>> > (IPv4/IPv6, config vs. read-only state).
>> > >
>> > >
>> > >
>> > > But I had quite a bit of trouble mapping the phrases from the new
>> > > draft-ietf-
>> > rtgwg-yang-vrrp-02 document to the existing VRRP documents (e.g. RFC5798).
>> > This might come from my unfamilarity with VRRP.
>> > >
>> > >
>> > >
>> > > The draft YANG model allows to read (if:interfaces-state) and
>> > > configure
>> > (if:interfaces) virtual IP addresses, but this does not seem to be a
>> > common phrase from the RFCs. Is it the same as "address of the virtual
>> > router" often mentioned in RFC5798?
>> > >
>> > >
>> > >
>> > > In addition to this, I found (I think) a typo or inconsistency in Appendix A:
>> > >
>> > > the ascii art says "eth0" but tree says "eth1".
>> > >
>> > >
>> > >
>> > > Henning Rogge
>> > >
>> > >
>> > >
>> > > On Mon, Mar 27, 2017 at 5:43 PM, Jonathan Hardwick
>> > <Jonathan.Hardwick@metaswitch.com> wrote:
>> > >
>> > > Hi Henning
>> > >
>> > >
>> > >
>> > > Please would you do a routing directorate early review of this
>> > > draft?  Would
>> > you be able to do it in 2 to 3 weeks?
>> > >
>> > >
>> > >
>> > > Many thanks
>> > >
>> > > Jon
>> > >
>> > >
>> > >
>> > >
>> > >
>> > > Please would you do a routing directorate QA review of this draft?
>> > >
>> > > https://datatracker.ietf.org/doc/draft-ietf-rtgwg-yang-vrrp/
>> > >
>> > >
>> > >
>> > > The draft is still in the RTGWG and is ready for WG last call.  The
>> > > WG chairs
>> > have asked for a QA review from the directorate.  The following link
>> > provides guidance on QA reviews.
>> > >
>> > > https://trac.ietf.org/trac/rtg/wiki/RtgDirDocQa
>> > >
>> > >
>> > >
>> > >
>> > >
>> > >


From nobody Tue May  2 02:05:03 2017
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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 Routing Area Working Group of the IETF.

        Title           : SPF Back-off algorithm for link state IGPs
        Authors         : Bruno Decraene
                          Stephane Litkowski
                          Hannes Gredler
                          Acee Lindem
                          Pierre Francois
                          Chris Bowers
	Filename        : draft-ietf-rtgwg-backoff-algo-05.txt
	Pages           : 12
	Date            : 2017-05-02

Abstract:
   This document defines a standard algorithm to back-off link-state IGP
   SPF computations.

   Having one standard algorithm improves interoperability by reducing
   the probability and/or duration of transient forwarding loops during
   the IGP convergence when the IGP reacts to multiple temporally close
   IGP events.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-backoff-algo/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-rtgwg-backoff-algo-05
https://datatracker.ietf.org/doc/html/draft-ietf-rtgwg-backoff-algo-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-rtgwg-backoff-algo-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: Alexander Vainshtein <vainshtein.alex@gmail.com>
Date: Tue, 2 May 2017 13:19:43 +0300
Message-ID: <CAA+i7Sv=H2vs1L7H9odN0ZfFxC954dN5FfCp+FRczEBWgxwc5w@mail.gmail.com>
Subject: RE: Early RTG-DIR review of draft-ietf-rtgwg-backoff-algo-04
To: Bruno Decraene <bruno.decraene@orange.com>
Cc: chrisbowers.ietf@gmail.com, rtgwg@ietf.org, rtg-dir@ietf.org,  jefftant.ietf@gmail.com,  Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>,  "Jonathan Hardwick (Jonathan.Hardwick@metaswitch.com)" <Jonathan.Hardwick@metaswitch.com>, rtg-ads@ietf.org,  draft-ietf-rtgwg-backoff-algo@ietf.org
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Bruno,
Lots of thanks for a prompt response.
I have looked up the -05 version, and it addresses all concerns I've raised
in my review.

Regards,
Sasha

On May 2, 2017 12:09, <bruno.decraene@orange.com> wrote:

> Hi Sasha,
>
>
>
> Many thanks for your careful review.
>
> Your comments have been constructive, useful and helped clarifying the
> draft. Thanks for this.
>
>
>
> We have updated the draft as per your comments. We believe that -05
> address all your comments. If it does not, please comment back.
>
> Draft: https://tools.ietf.org/html/draft-ietf-rtgwg-backoff-algo-05
>
> Diff: https://tools.ietf.org/rfcdiff?url2=3Ddraft-ietf-rtgwg-
> backoff-algo-05.txt
>
>
>
>
>
> --Bruno, on behalf of all authors.
>
>
>
> *From:* rtg-dir [mailto:rtg-dir-bounces@ietf.org] *On Behalf Of *Alexande=
r
> Vainshtein
> *Sent:* Thursday, April 27, 2017 2:25 PM
> *To:* jefftant.ietf@gmail.com; chrisbowers.ietf@gmail.com
> *Cc:* rtg-dir@ietf.org; draft-ietf-rtgwg-backoff-algo@ietf.org;
> rtg-ads@ietf.org; vainshtein.alex@gmail.com; Jonathan Hardwick (
> Jonathan.Hardwick@metaswitch.com); rtgwg@ietf.org
> *Subject:* [RTG-DIR] Early RTG-DIR review of
> draft-ietf-rtgwg-backoff-algo-04
>
>
>
> Hello,
>
>
>
> I have been selected as the Routing Directorate as an early reviewer for
> this draft. The Routing Directorate seeks to review all routing or
> routing-related drafts as they pass through IETF last call and IESG revie=
w,
> and sometimes on special request. In this case an early review has been
> requested by Jeff Tantsura =E2=80=93 one of the co-chairs of the RTGWG.
>
> The purpose of the review is to provide assistance to the Routing ADs.
> For more information about the Routing Directorate, please see =E2=80=8B
> http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir
>
>
>
> *Document*: draft-ietf-rtgwg-backoff-algo-04
>
> *Reviewer*: Alexander (=E2=80=9CSasha=E2=80=9D) Vainshtein
>
> *Review Date*: 27-Apr-17
>
> *IETF LC End Date*: N/A
>
> *Intended Status*: Standards Track
>
>
>
> *Summary*:
>
> I have some minor concerns about this document that, from my POV, should
> be resolved before publication.
>
>
>
> *Comments*:
>
> The draft is very well written, and, with one notable exception, easy to
> understand.
>
> It represents an attempt to standardize one aspect of behavior of
> link-state routing protocols: delay between the first IGP event that
> triggers new SPF computation and the SPF calculation. Until now, this bee=
n
> left for the implementers to play with freely. The resulting differences
> have been known for quite some time to result in some case in transient
> micro-loops.
>
>
>
> The resolution proposed in this draft includes a well-defined FSM and a
> full set of tunable parameters (timers) used in this FSM.
>
> The range and granularity of all the tunable parameters are explicitly
> defined in the document so that the operator would be able to tune its
> network to use exactly the same SPF delay algorithm with exactly the same
> parameters. (The default values are not defined because one size does not
> fit all in this case).
>
>
>
> It should be noticed that the draft does not intend to provide a
> comprehensive solution of the micro-loop problems.
>
> Rather, it provides a common baseline upon which specific solutions for
> these problems can be built (e.g., see draft-ietf-rtgwg-uloop-delay
> <https://datatracker.ietf.org/doc/draft-ietf-rtgwg-uloop-delay/?include_t=
ext=3D1>
> ).
>
>
>
> *Major Issues*: None found.
>
>
>
> *Minor Issues*:
>
> 1.       The exception to good readability of the draft refers to the
> term =E2=80=9C*proximate* failures/IGP events=E2=80=9D that appears 4 tim=
es in the draft.
> English is not my mother tongue, and the reference
> <https://www.merriam-webster.com/thesaurus/proximate> I=E2=80=99ve looked=
 up did
> not help much. =E2=80=9CTemporally close=E2=80=9D (or something along the=
se lines) looks
> like a suitable alternative. (Does this comment run strictly against the
> recommendation for the RTG-DIR reviewers =E2=80=9Cto avoid raising esoter=
ic
> questions of English usage=E2=80=9D?)
>
> 2.       Section 5 mentions starting the SPF_TIMER (with one of the 3
> values defined for it) as part of the response to some FSM events if it w=
as
> not already running -  but *it does not specify what happens when this
> timer expires*. I assume that its expiration leaves the FSM in its
> current state and results in running the SPF computation =E2=80=93 if thi=
s is
> correct, it would be nice to say that explicitly.
>
> 3.       Section 7 recommends that,  in order to mitigate micro-loop
> problems using the proposed algorithm, =E2=80=9Call routers in the IGP do=
main, or
> at least all the routers in the same area/level, have exactly the same
> configured  values=E2=80=9D of the relevant timers . However, the draft d=
oes not
> specify whether these timers should be configured just at the protocol
> instance level or also at the level of each specific area/level. From my
> POV, the *granularity of configuration* should be defined in this draft =
=E2=80=93
> one way or another.
>
> 4.       The latest versions of the YANG data model drafts for IS-IS and
> OSPF already define the timers introduced in this draft. But *there are
> no references to these drafts in the document*. From my POV such
> references (Informational and therefore non-blocking) would be useful for
> the readers, and I suggest to add them.
>
> 5.       I have some concerns regarding *incremental introduction and
> activation of the proposed algorithm*. The operator that runs a
> well-tuned network may experience transient problems when some of its
> routers are already upgraded and use the proposed back-off algorithm whil=
e
> some others still cannot do that. Some text explaining potential issues i=
n
> this scenario and, if possible, their mitigation, would be most helpful.
>
> 6.       The explanatory text in the draft seems to strongly suggest
> that  *SPF_INITIAL_DELAY <=3D SPF_SHORT_DELAY <=3D  SPF_LONG_DELAY *=E2=
=80=93  but
> this is not formalized as a requirement anywhere in the text. From my POV
> satisfying this relationship should be RECOMMENDED to the operators.
>
>
>
> *NITS*:
>
> 1.       Section 3 lists 3 possible values for the SPF_DELAY variable
> called INITIAL_SPF_DELAY, SHORT SPF_DELAY and LONG_SPF_DELAY. Then, in th=
e
> last para, it refers to *a previously undefined value, INITIAL_WAIT*.
> This is an obvious typo and should be replaced with INITIAL_SPF_DELAY
>
> 2.       One of the parameters of the algorithm is called
> *HOLD_DOWN_INTERVAL* (in Section 3 and Section 6)  vs. *HOLDDOWN_INTERVAL=
*
> in Section 5. This also looks like an obvious typo, and the same name
> should be used across the document.
>
>
>
> I have discussed my concerns about the draft with the authors who have
> been most cooperative.
>
> I believe that we have reached an agreement on acceptable resolution of
> all concerns listed above.
>
>
>
> Regards,
>
> Sasha
>
>
>
> Office: +972-39266302 <+972%203-926-6302>
>
> Cell:      +972-549266302 <+972%2054-926-6302>
>
> Email:   Alexander.Vainshtein@ecitele.com
>
>
>
>
> ____________________________________________________________
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>
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<div dir=3D"auto">Bruno,<div dir=3D"auto">Lots of thanks for a prompt respo=
nse.</div><div dir=3D"auto">I have looked up the -05 version, and it addres=
ses all concerns I&#39;ve raised in my review.</div><div dir=3D"auto"><br><=
/div><div dir=3D"auto">Regards,</div><div dir=3D"auto">Sasha</div></div><di=
v class=3D"gmail_extra"><br><div class=3D"gmail_quote">On May 2, 2017 12:09=
,  &lt;<a href=3D"mailto:bruno.decraene@orange.com">bruno.decraene@orange.c=
om</a>&gt; wrote:<br type=3D"attribution"><blockquote class=3D"gmail_quote"=
 style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"FR" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"m_7790957708407595770WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1f497d">Hi Sash=
a,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1f497d"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1f497d">Many th=
anks for your careful review.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1f497d">Your co=
mments have been constructive, useful and helped clarifying the draft. Than=
ks for this.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1f497d"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1f497d">We have=
 updated the draft as per your comments. We believe that -05 address all yo=
ur comments. If it does not, please comment back.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1f497d">Draft: =
<a href=3D"https://tools.ietf.org/html/draft-ietf-rtgwg-backoff-algo-05" ta=
rget=3D"_blank">
https://tools.ietf.org/html/<wbr>draft-ietf-rtgwg-backoff-algo-<wbr>05</a><=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1f497d">Diff: <=
a href=3D"https://tools.ietf.org/rfcdiff?url2=3Ddraft-ietf-rtgwg-backoff-al=
go-05.txt" target=3D"_blank">
https://tools.ietf.org/<wbr>rfcdiff?url2=3Ddraft-ietf-rtgwg-<wbr>backoff-al=
go-05.txt</a><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1f497d"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1f497d"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1f497d">--Bruno=
, on behalf of all authors.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1f497d"><u></u>=
=C2=A0<u></u></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> rtg-dir =
[mailto:<a href=3D"mailto:rtg-dir-bounces@ietf.org" target=3D"_blank">rtg-d=
ir-bounces@ietf.<wbr>org</a>]
<b>On Behalf Of </b>Alexander Vainshtein<br>
<b>Sent:</b> Thursday, April 27, 2017 2:25 PM<br>
<b>To:</b> <a href=3D"mailto:jefftant.ietf@gmail.com" target=3D"_blank">jef=
ftant.ietf@gmail.com</a>; <a href=3D"mailto:chrisbowers.ietf@gmail.com" tar=
get=3D"_blank">chrisbowers.ietf@gmail.com</a><br>
<b>Cc:</b> <a href=3D"mailto:rtg-dir@ietf.org" target=3D"_blank">rtg-dir@ie=
tf.org</a>; <a href=3D"mailto:draft-ietf-rtgwg-backoff-algo@ietf.org" targe=
t=3D"_blank">draft-ietf-rtgwg-backoff-algo@<wbr>ietf.org</a>; <a href=3D"ma=
ilto:rtg-ads@ietf.org" target=3D"_blank">rtg-ads@ietf.org</a>; <a href=3D"m=
ailto:vainshtein.alex@gmail.com" target=3D"_blank">vainshtein.alex@gmail.co=
m</a>; Jonathan Hardwick (<a href=3D"mailto:Jonathan.Hardwick@metaswitch.co=
m" target=3D"_blank">Jonathan.Hardwick@metaswitch.<wbr>com</a>); <a href=3D=
"mailto:rtgwg@ietf.org" target=3D"_blank">rtgwg@ietf.org</a><br>
<b>Subject:</b> [RTG-DIR] Early RTG-DIR review of draft-ietf-rtgwg-backoff-=
algo-<wbr>04<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hello,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I have been selected as the Rou=
ting Directorate as an early reviewer for this draft. The Routing Directora=
te seeks to review all routing or routing-related drafts as they pass throu=
gh IETF last call and IESG review, and
 sometimes on special request. In this case an early review has been reques=
ted by Jeff Tantsura =E2=80=93 one of the co-chairs of the RTGWG.<u></u><u>=
</u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The purpose of the review is to=
 provide assistance to the Routing ADs.=C2=A0=C2=A0 For more information ab=
out the Routing Directorate, please see =E2=80=8B<a href=3D"http://trac.too=
ls.ietf.org/area/rtg/trac/wiki/RtgDir" target=3D"_blank">http://trac.tools.=
ietf.org/<wbr>area/rtg/trac/wiki/RtgDir</a><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">Document</span></b><span lan=
g=3D"EN-US">: draft-ietf-rtgwg-backoff-algo-<wbr>04<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">Reviewer</span></b><span lan=
g=3D"EN-US">: Alexander (=E2=80=9CSasha=E2=80=9D) Vainshtein
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">Review Date</span></b><span =
lang=3D"EN-US">: 27-Apr-17
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">IETF LC End Date</span></b><=
span lang=3D"EN-US">: N/A<u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">Intended Status</span></b><s=
pan lang=3D"EN-US">: Standards Track<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">Summary</span></b><span lang=
=3D"EN-US">:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I have some minor concerns abou=
t this document that, from my POV, should be resolved before publication.<u=
></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">Comments</span></b><span lan=
g=3D"EN-US">:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The draft is very well written,=
 and, with one notable exception, easy to understand.<u></u><u></u></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">It represents an attempt to sta=
ndardize one aspect of behavior of link-state routing protocols: delay betw=
een the first IGP event that triggers new SPF computation and the SPF calcu=
lation. Until now, this been left for
 the implementers to play with freely. The resulting differences have been =
known for quite some time to result in some case in transient micro-loops. =
=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The resolution proposed in this=
 draft includes a well-defined FSM and a full set of tunable parameters (ti=
mers) used in this FSM.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The range and granularity of al=
l the tunable parameters are explicitly defined in the document so that the=
 operator would be able to tune its network to use exactly the same SPF del=
ay algorithm with exactly the same parameters.
 (The default values are not defined because one size does not fit all in t=
his case).<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">It should be noticed that the d=
raft does not intend to provide a comprehensive solution of the micro-loop =
problems.=C2=A0
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Rather, it provides a common ba=
seline upon which specific solutions for these problems can be built (e.g.,=
 see
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-rtgwg-uloop-delay/?i=
nclude_text=3D1" target=3D"_blank">
draft-ietf-rtgwg-uloop-delay</a>).<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">Major Issues</span></b><span=
 lang=3D"EN-US">: None found.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">Minor Issues</span></b><span=
 lang=3D"EN-US">:<u></u><u></u></span></p>
<p class=3D"m_7790957708407595770MsoListParagraph"><span lang=3D"EN-US">1.<=
/span><span lang=3D"EN-US" style=3D"font-size:7.0pt;font-family:&quot;Times=
 New Roman&quot;,&quot;serif&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span lang=3D"EN-US">The exception to good readability of the draft =
refers to the term =E2=80=9C<b><i>proximate</i></b> failures/IGP events=E2=
=80=9D that appears 4 times in the draft. English is not my mother tongue, =
and the
<a href=3D"https://www.merriam-webster.com/thesaurus/proximate" target=3D"_=
blank">reference</a> I=E2=80=99ve looked up did not help much. =E2=80=9CTem=
porally close=E2=80=9D (or something along these lines) looks like a suitab=
le alternative. (Does this comment run strictly against the recommendation =
for
 the RTG-DIR reviewers =E2=80=9Cto avoid raising esoteric questions of Engl=
ish usage=E2=80=9D?)<u></u><u></u></span></p>
<p class=3D"m_7790957708407595770MsoListParagraph"><span lang=3D"EN-US">2.<=
/span><span lang=3D"EN-US" style=3D"font-size:7.0pt;font-family:&quot;Times=
 New Roman&quot;,&quot;serif&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span lang=3D"EN-US">Section 5 mentions starting the SPF_TIMER (with=
 one of the 3 values defined for it) as part of the response to some FSM ev=
ents if it was not already running -=C2=A0 but
<b><i>it does not specify what happens when this timer expires</i></b>. I a=
ssume that its expiration leaves the FSM in its current state and results i=
n running the SPF computation =E2=80=93 if this is correct, it would be nic=
e to say that explicitly.<u></u><u></u></span></p>
<p class=3D"m_7790957708407595770MsoListParagraph"><span lang=3D"EN-US">3.<=
/span><span lang=3D"EN-US" style=3D"font-size:7.0pt;font-family:&quot;Times=
 New Roman&quot;,&quot;serif&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span lang=3D"EN-US">Section 7 recommends that,=C2=A0 in order to mi=
tigate micro-loop problems using the proposed algorithm, =E2=80=9Call route=
rs in the IGP domain, or at least all the routers in the same area/level, h=
ave exactly the same configured=C2=A0 values=E2=80=9D of the
 relevant timers . However, the draft does not specify whether these timers=
 should be configured just at the protocol instance level or also at the le=
vel of each specific area/level. From my POV, the
<b><i>granularity of configuration</i></b> should be defined in this draft =
=E2=80=93 one way or another.<u></u><u></u></span></p>
<p class=3D"m_7790957708407595770MsoListParagraph"><span lang=3D"EN-US">4.<=
/span><span lang=3D"EN-US" style=3D"font-size:7.0pt;font-family:&quot;Times=
 New Roman&quot;,&quot;serif&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span lang=3D"EN-US">The latest versions of the YANG data model draf=
ts for IS-IS and OSPF already define the timers introduced in this draft. B=
ut
<b><i>there are no references to these drafts in the document</i></b>. From=
 my POV such references (Informational and therefore non-blocking) would be=
 useful for the readers, and I suggest to add them.<u></u><u></u></span></p=
>
<p class=3D"m_7790957708407595770MsoListParagraph"><span lang=3D"EN-US">5.<=
/span><span lang=3D"EN-US" style=3D"font-size:7.0pt;font-family:&quot;Times=
 New Roman&quot;,&quot;serif&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span lang=3D"EN-US">I have some concerns regarding <b><i>incrementa=
l introduction and activation of the proposed algorithm</i></b>. The operat=
or that runs a well-tuned network may experience transient problems when so=
me of its routers are already upgraded
 and use the proposed back-off algorithm while some others still cannot do =
that. Some text explaining potential issues in this scenario and, if possib=
le, their mitigation, would be most helpful.<u></u><u></u></span></p>
<p class=3D"m_7790957708407595770MsoListParagraph"><span lang=3D"EN-US">6.<=
/span><span lang=3D"EN-US" style=3D"font-size:7.0pt;font-family:&quot;Times=
 New Roman&quot;,&quot;serif&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span lang=3D"EN-US">The explanatory text in the draft seems to stro=
ngly suggest that=C2=A0
</span><b><span lang=3D"EN-US" style=3D"font-family:&quot;Courier New&quot;=
">SPF_INITIAL_DELAY &lt;=3D SPF_SHORT_DELAY &lt;=3D=C2=A0 SPF_LONG_DELAY
</span></b><span lang=3D"EN-US">=E2=80=93=C2=A0 but this is not formalized =
as a requirement anywhere in the text. From my POV satisfying this relation=
ship should be RECOMMENDED to the operators.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">NITS</span></b><span lang=3D=
"EN-US">:<u></u><u></u></span></p>
<p class=3D"m_7790957708407595770MsoListParagraph"><span lang=3D"EN-US">1.<=
/span><span lang=3D"EN-US" style=3D"font-size:7.0pt;font-family:&quot;Times=
 New Roman&quot;,&quot;serif&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span lang=3D"EN-US">Section 3 lists 3 possible values for the SPF_D=
ELAY variable called INITIAL_SPF_DELAY, SHORT SPF_DELAY and LONG_SPF_DELAY.=
 Then, in the last para, it refers to
<b><i>a previously undefined value, INITIAL_WAIT</i></b>. This is an obviou=
s typo and should be replaced with INITIAL_SPF_DELAY<u></u><u></u></span></=
p>
<p class=3D"m_7790957708407595770MsoListParagraph"><span lang=3D"EN-US">2.<=
/span><span lang=3D"EN-US" style=3D"font-size:7.0pt;font-family:&quot;Times=
 New Roman&quot;,&quot;serif&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span lang=3D"EN-US">One of the parameters of the algorithm is calle=
d <b>HOLD_DOWN_INTERVAL</b> (in Section 3 and Section 6)=C2=A0 vs.
<b>HOLDDOWN_INTERVAL</b> in Section 5. This also looks like an obvious typo=
, and the same name should be used across the document.<u></u><u></u></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I have discussed my concerns ab=
out the draft with the authors who have been most cooperative.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I believe that we have reached =
an agreement on acceptable resolution of all concerns listed above.<u></u><=
u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Regards,<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Sasha<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Office: <a href=3D"tel:+972%203=
-926-6302" value=3D"+97239266302" target=3D"_blank">+972-39266302</a><u></u=
><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Cell:=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 <a href=3D"tel:+972%2054-926-6302" value=3D"+972549266302" target=3D=
"_blank">+972-549266302</a><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Email:=C2=A0=C2=A0 <a href=3D"m=
ailto:Alexander.Vainshtein@ecitele.com" target=3D"_blank">
Alexander.Vainshtein@ecitele.<wbr>com</a><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Times New Roman&quot;,&quot;serif&quot;"><br>
______________________________<wbr>______________________________<wbr>_____=
__________<br>
<br>
This e-mail message is intended for the recipient only and contains informa=
tion which is
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CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
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__________<u></u><u></u></span></p>
</div>
</div>
<pre>______________________________<wbr>______________________________<wbr>=
______________________________<wbr>______________________________<wbr>_

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</pre></div>

</blockquote></div></div>

--001a113f837eec9efa054e87e042--


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From: Daniele Ceccarelli <daniele.ceccarelli@ericsson.com>
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Subject: QA review of draft-ietf-rtgwg-device-model-02
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Hello,

i've been selected as the QA reviewer for draft-ietf-rtgwg-device-model-02.

I believe the draft is well written and quite easy to understand, I just ha=
ve some minor suggestion that might be help improving the readability (most=
ly for non subject experts).


-          Title: the title is not very clear, while the abstract explains =
very well in the first sentence what the goal of the draft is, what about c=
hanging it into: "A logical organization for network device YANG models" ?

-          Introduction: You are referencing an individual draft. This coul=
d be a block for the draft, but most of all does it make sense to have two =
separate drafts (in two different WGs), one to say the value of organizing =
YANG models  and the other one defining a logical organization for the mode=
ls? (maybe too late for such change)

-          Introduction: this sentence is a bit confusing:

"  This document refers to two new modules that are expected to be  impleme=
nted.  These models are defined to support the configuration  and operation=
 of network-devices that allow for the partitioning of  resources from both=
, or either, management and networking   perspectives.  Two forms of resour=
ce partitioning are referenced:"
                Maybe a modules/models mismatch? You start saying that the =
doc refers to two MODULES, then you say that MODELS are defined and the lis=
t two FORMS OF RESOURCE PARTITIONING.

-          Intro: "    Should structural-mount/YSDL not be available, the m=
ore explicit tree structure presented in earlier versions of this document =
will need to  be utilized." If it was described in previous versions of the=
 document it is no longer available, or ?

-          Scope: as I got it while reading and as it is confirmed in the d=
raft, the scope is "limited"  to physical and virtual switches and routers =
and not devices operating at the lower layers. Since you say "we consider n=
etwork devices that support protocols  and functions defined within the IET=
F Routing Area" I would expect it to cover also lower layer devices.

-          Section 2: Section 2 and its subsection are very clear and expla=
in well the concepts but it is not clear where the list comes from. It part=
ially overlaps with the "overall structure" example above but at least havi=
ng all of them in the overall structure plus some others (provided as examp=
le and not analyzed in the details with dedicated subsection ) would help.

BR
Daniele

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<p class=3D"MsoNormal">Hello,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">i&#8217;ve been selected as the=
 QA reviewer for draft-ietf-rtgwg-device-model-02.<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">I believe the draft is well wri=
tten and quite easy to understand, I just have some minor suggestion that m=
ight be help improving the readability (mostly for non subject experts).<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"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo1"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Title: the title is not=
 very clear, while the abstract explains very well in the first sentence wh=
at the goal of the draft is, what about changing it into: &#8220;A logical =
organization for network device YANG models&#8221;
 ?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo1"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Introduction: You are r=
eferencing an individual draft. This could be a block for the draft, but mo=
st of all does it make sense to have two separate drafts (in two different =
WGs), one to say the value of organizing
 YANG models&nbsp; and the other one defining a logical organization for th=
e models? (maybe too late for such change)<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo1"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Introduction: this sent=
ence is a bit confusing:
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US">&#8220;&nbsp; This docum=
ent refers to two new modules that are expected to be&nbsp; implemented.&nb=
sp; These models are defined to support the configuration&nbsp; and operati=
on of network-devices that allow for the partitioning of&nbsp; resources
 from both, or either, management and networking&nbsp;&nbsp; perspectives.&=
nbsp; Two forms of resource partitioning are referenced:&#8221;<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Maybe a modules=
/models mismatch? You start saying that the doc refers to two MODULES, then=
 you say that MODELS are defined and the list two FORMS OF RESOURCE PARTITI=
ONING.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo1"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Intro: &#8220; &nbsp;&n=
bsp;&nbsp;Should structural-mount/YSDL not be available, the more explicit =
tree structure presented in earlier versions of this document will need to&=
nbsp; be utilized.&#8221; If it was described in previous versions
 of the document it is no longer available, or ?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo1"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Scope: as I got it whil=
e reading and as it is confirmed in the draft, the scope is &#8220;limited&=
#8221;&nbsp; to physical and virtual switches and routers and not devices o=
perating at the lower layers. Since you say &#8220;we consider
 network devices that support protocols&nbsp; and functions defined within =
the IETF Routing Area&#8221; I would expect it to cover also lower layer de=
vices.
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo1"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Section 2: Section 2 an=
d its subsection are very clear and explain well the concepts but it is not=
 clear where the list comes from. It partially overlaps with the &#8220;ove=
rall structure&#8221; example above but at least
 having all of them in the overall structure plus some others (provided as =
example and not analyzed in the details with dedicated subsection ) would h=
elp.<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">BR<br>
Daniele&nbsp; <o:p></o:p></span></p>
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From: Daniele Ceccarelli <daniele.ceccarelli@ericsson.com>
To: "draft-ietf-rtgwg-device-model-02@tools.ietf.org" <draft-ietf-rtgwg-device-model-02@tools.ietf.org>, "rtgwg-chairs@ietf.org" <rtgwg-chairs@ietf.org>
CC: "<rtg-ads@ietf.org> (rtg-ads@ietf.org)" <rtg-ads@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>, "Jonathan Hardwick (Jonathan.Hardwick@metaswitch.com)" <Jonathan.Hardwick@metaswitch.com>, "Yemin (Amy)" <amy.yemin@huawei.com>
Subject: RE: QA review of draft-ietf-rtgwg-device-model-02
Thread-Topic: QA review of draft-ietf-rtgwg-device-model-02
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Date: Tue, 2 May 2017 22:27:00 +0000
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Resending with the right exploder.

BR
Daniele

From: Daniele Ceccarelli
Sent: mercoled=EC 3 maggio 2017 00:22
To: draft-ietf-rtgwg-device-model-02@ietf.org; rtgwg-chairs@ietf.org
Cc: <rtg-ads@ietf.org> (rtg-ads@ietf.org) <rtg-ads@ietf.org>; rtgwg@ietf.or=
g; Jonathan Hardwick (Jonathan.Hardwick@metaswitch.com) <Jonathan.Hardwick@=
metaswitch.com>; Yemin (Amy) <amy.yemin@huawei.com>
Subject: QA review of draft-ietf-rtgwg-device-model-02

Hello,

i've been selected as the QA reviewer for draft-ietf-rtgwg-device-model-02.

I believe the draft is well written and quite easy to understand, I just ha=
ve some minor suggestion that might be help improving the readability (most=
ly for non subject experts).


-          Title: the title is not very clear, while the abstract explains =
very well in the first sentence what the goal of the draft is, what about c=
hanging it into: "A logical organization for network device YANG models" ?

-          Introduction: You are referencing an individual draft. This coul=
d be a block for the draft, but most of all does it make sense to have two =
separate drafts (in two different WGs), one to say the value of organizing =
YANG models  and the other one defining a logical organization for the mode=
ls? (maybe too late for such change)

-          Introduction: this sentence is a bit confusing:

"  This document refers to two new modules that are expected to be  impleme=
nted.  These models are defined to support the configuration  and operation=
 of network-devices that allow for the partitioning of  resources from both=
, or either, management and networking   perspectives.  Two forms of resour=
ce partitioning are referenced:"
                Maybe a modules/models mismatch? You start saying that the =
doc refers to two MODULES, then you say that MODELS are defined and the lis=
t two FORMS OF RESOURCE PARTITIONING.

-          Intro: "    Should structural-mount/YSDL not be available, the m=
ore explicit tree structure presented in earlier versions of this document =
will need to  be utilized." If it was described in previous versions of the=
 document it is no longer available, or ?

-          Scope: as I got it while reading and as it is confirmed in the d=
raft, the scope is "limited"  to physical and virtual switches and routers =
and not devices operating at the lower layers. Since you say "we consider n=
etwork devices that support protocols  and functions defined within the IET=
F Routing Area" I would expect it to cover also lower layer devices.

-          Section 2: Section 2 and its subsection are very clear and expla=
in well the concepts but it is not clear where the list comes from. It part=
ially overlaps with the "overall structure" example above but at least havi=
ng all of them in the overall structure plus some others (provided as examp=
le and not analyzed in the details with dedicated subsection ) would help.

BR
Daniele

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US">Resending with the right explod=
er.<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">BR<br>
Daniele&nbsp; <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b><span lang=3D"EN-US"=
 style=3D"mso-fareast-language:IT">From:</span></b><span lang=3D"EN-US" sty=
le=3D"mso-fareast-language:IT"> Daniele Ceccarelli
<br>
<b>Sent:</b> mercoled=EC 3 maggio 2017 00:22<br>
<b>To:</b> draft-ietf-rtgwg-device-model-02@ietf.org; rtgwg-chairs@ietf.org=
<br>
<b>Cc:</b> &lt;rtg-ads@ietf.org&gt; (rtg-ads@ietf.org) &lt;rtg-ads@ietf.org=
&gt;; rtgwg@ietf.org; Jonathan Hardwick (Jonathan.Hardwick@metaswitch.com) =
&lt;Jonathan.Hardwick@metaswitch.com&gt;; Yemin (Amy) &lt;amy.yemin@huawei.=
com&gt;<br>
<b>Subject:</b> QA review of draft-ietf-rtgwg-device-model-02<o:p></o:p></s=
pan></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Hello,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US">i&=
#8217;ve been selected as the QA reviewer for draft-ietf-rtgwg-device-model=
-02.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US">I =
believe the draft is well written and quite easy to understand, I just have=
 some minor suggestion that might be help improving the readability (mostly=
 for non subject experts).<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:71.4pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">-=
<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Title: the title is not=
 very clear, while the abstract explains very well in the first sentence wh=
at the goal of the draft is, what about changing it into: &#8220;A logical =
organization for network device YANG models&#8221;
 ?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:71.4pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">-=
<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Introduction: You are r=
eferencing an individual draft. This could be a block for the draft, but mo=
st of all does it make sense to have two separate drafts (in two different =
WGs), one to say the value of organizing
 YANG models&nbsp; and the other one defining a logical organization for th=
e models? (maybe too late for such change)<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:71.4pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">-=
<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Introduction: this sent=
ence is a bit confusing:
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:71.4pt"><span lang=3D"EN=
-US">&#8220;&nbsp; This document refers to two new modules that are expecte=
d to be&nbsp; implemented.&nbsp; These models are defined to support the co=
nfiguration&nbsp; and operation of network-devices that allow for
 the partitioning of&nbsp; resources from both, or either, management and n=
etworking&nbsp;&nbsp; perspectives.&nbsp; Two forms of resource partitionin=
g are referenced:&#8221;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US">&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; Maybe a modules/models mismatch? You start saying that the do=
c refers to two MODULES, then you say that MODELS are defined and the list =
two FORMS OF RESOURCE PARTITIONING.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:71.4pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">-=
<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Intro: &#8220; &nbsp;&n=
bsp;&nbsp;Should structural-mount/YSDL not be available, the more explicit =
tree structure presented in earlier versions of this document will need to&=
nbsp; be utilized.&#8221; If it was described in previous versions
 of the document it is no longer available, or ?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:71.4pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">-=
<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Scope: as I got it whil=
e reading and as it is confirmed in the draft, the scope is &#8220;limited&=
#8221;&nbsp; to physical and virtual switches and routers and not devices o=
perating at the lower layers. Since you say &#8220;we consider
 network devices that support protocols&nbsp; and functions defined within =
the IETF Routing Area&#8221; I would expect it to cover also lower layer de=
vices.
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:71.4pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">-=
<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Section 2: Section 2 an=
d its subsection are very clear and explain well the concepts but it is not=
 clear where the list comes from. It partially overlaps with the &#8220;ove=
rall structure&#8221; example above but at least
 having all of them in the overall structure plus some others (provided as =
example and not analyzed in the details with dedicated subsection ) would h=
elp.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"><o=
:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US">BR=
<br>
Daniele&nbsp; <o:p></o:p></span></p>
</div>
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From: Jonathan Hardwick <jonathan.hardwick@metaswitch.com>
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Subject: Rtgdir early review of draft-ietf-rtgwg-device-model-02
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Reviewer: Daniele Ceccarelli
Review result: Has Nits

Hello,
 
I’ve been selected as the QA reviewer for
draft-ietf-rtgwg-device-model-02.
 
I believe the draft is well written and quite easy to understand, I
just have some minor suggestion that might be help improving the
readability (mostly for non subject experts).
 
-	Title: the title is not very clear, while the abstract explains very
well in the first sentence what the goal of the draft is, what about
changing it into: “A logical organization for network device YANG
models” ?
-	Introduction: You are referencing an individual draft. This could be
a block for the draft, but most of all does it make sense to have two
separate drafts (in two different WGs), one to say the value of
organizing YANG models  and the other one defining a logical
organization for the models? (maybe too late for such change)
-	Introduction: this sentence is a bit confusing: 
“  This document refers to two new modules that are expected to be 
implemented.  These models are defined to support the configuration 
and operation of network-devices that allow for the partitioning of 
resources from both, or either, management and networking  
perspectives.  Two forms of resource partitioning are referenced:”
                Maybe a modules/models mismatch? You start saying that
the doc refers to two MODULES, then you say that MODELS are defined
and the list two FORMS OF RESOURCE PARTITIONING.
-	Intro: “    Should structural-mount/YSDL not be available, the more
explicit tree structure presented in earlier versions of this document
will need to  be utilized.” If it was described in previous versions
of the document it is no longer available, or ?
-	Scope: as I got it while reading and as it is confirmed in the
draft, the scope is “limited”  to physical and virtual switches and
routers and not devices operating at the lower layers. Since you say
“we consider network devices that support protocols  and functions
defined within the IETF Routing Area” I would expect it to cover also
lower layer devices. 
-	Section 2: Section 2 and its subsection are very clear and explain
well the concepts but it is not clear where the list comes from. It
partially overlaps with the “overall structure” example above but at
least having all of them in the overall structure plus some others
(provided as example and not analyzed in the details with dedicated
subsection ) would help.
 
BR
Daniele  



From nobody Wed May  3 07:54:37 2017
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From: Stewart Bryant <stewart@g3ysx.org.uk>
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Cc: rtgwg@ietf.org, ietf@ietf.org, draft-ietf-rtgwg-routing-types.all@ietf.org
Subject: Rtgdir early partial review of draft-ietf-rtgwg-routing-types-02
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Review is partially done. Another review request has been registered
for completing it.

Reviewer: Stewart Bryant
Review result: Has Issues

Firstly I should say that I am not an expert in YANG, hence my
suggestion that you may wish to assign an additional reviewer.

However in reviewing this a number of questions and issues arose:

2.  Overview

   This document defines the following data types:

SB> Accessibility note - the order of types seems random. It might
SB> be more helpful to the reader if they were, in a systematic order
SB> for example alphabetical and/or dependency order.

=======

 router-id
      Router Identifiers are commonly used to identify a nodes in
SB> s/a nodes/nodes/

=======

   route-target-type
      This type defines the import and export rules of Route Targets,
as
      descibed in Section 4.3.1 of [RFC4364].  An example usage can
be
SB> s/descibed/described/
      found in [I-D.ietf-idr-bgp-model].

========

SB> I am surprised that IP multicast addresses are here, but IP
addresses are not.
SB> I would have thought that both should be in the same place.

========

SB> In some protocols we use the NTP and the 1588 timer types, I
assume
SB> they are defined elsewhere.

========

   mpls-label
      The 20 bits label values in an MPLS label stack entry,
specified
      in [RFC3032].  This label value does not include the encodings
of
      Traffic Class and TTL (time to live).  The label range
specified
      by this type covers the general use values and the
special-purpose
      label values.  An example usage can be found in
      [I-D.ietf-mpls-base-yang].

SB> I am surprised that you don't start with label and then define the

SB> other label definitions in terms of existing definitions.
SB> The obvious order being label, sp-label, gp-label, generalized

========

S/ "This identity represents IPv4 address family.";/"This identity
represents the IPv4 address family.";

========

     //The rest of the values deinfed in the IANA registry
SB> s/deinfed/defined/

SB> However a question arises, the list stops at mt-v6
SB> Why do you stop at this point in the IANA list?
SB>
https://www.iana.org/assignments/address-family-numbers/address-family-numbers.xhtml
SB> It cannot be because some of the later ones are less relevant, as
some of the 
SB> included ones are rather rare. One the other hand there are some
later ones that 
SB> seem modern and useful.
SB>
SB> Also why do you have types in this list that you do not later
define in detail?

===========

SB> You have generalized label in the list top, but not in
SB> the YANG model itself.

===========



From nobody Wed May  3 08:51:27 2017
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From: Alexey Melnikov <aamelnikov@fastmail.fm>
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Cc: draft-ietf-rtgwg-yang-key-chain@ietf.org, Jeff Tantsura <jefftant.ietf@gmail.com>, rtgwg-chairs@ietf.org, jefftant.ietf@gmail.com, rtgwg@ietf.org
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Alexey Melnikov has entered the following ballot position for
draft-ietf-rtgwg-yang-key-chain-24: No Objection

When responding, please keep the subject line intact and reply to all
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Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
for more information about IESG DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-yang-key-chain/



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

Thank you for addressing my DISCUSS.

Maybe it is just me, but it would have helped to say that "key string in
ASCII" is a passphrase. I was not sure whether "key string" was a term
used in Routing and/or YANG circles. The best place to clarify this is in
Section 2   (Problem Statement)



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----- Original Message -----
From: "Henning Rogge" <hrogge@gmail.com>
Sent: Tuesday, May 02, 2017 7:49 AM
>
> yes I think the new changes improve the draft and make it easier to
understand.
>
> I wonder if there is a way in YANG to prevent the duplication of all
> the fields between "interface" and "interface-state"... putting the
> common fields into a section of their own and refer to them twice,
> once as "read only" and once "read-writeable".

No:-(

This has become a thorny and vexed question with lots of solutions whose
benefits depend on where you are coming from with no consensus among the
interested parties. NETCONF/YANG set out to support configuration which
is defined as something writeable. Read only, well it was not ignored
but it did take a back seat since SNMP was already handling that part of
network management.  A requirement emerged to know what the results were
of a configuration change.  I enable an interface; is it now enabled?  I
set an interface card to auto; what speed is it running at?  Clearly
there are 'twin' objects, sometimes triads or more.  Rather late in the
day it emerged that in YANG read-only objects that are below a
read-write object that has not been written do not exist.  This led to
the twin trees approach that is widely used, one tree for read-only, one
for read-write.

Other dimensions of this problem are the need either for configuration
to come first and a hot-plugged card to pick up the configuration or for
hot-plugging to come first and then the card be configured; and for the
box to provide default values to minimise the configuration needed and
for the NMS to know what the defaults are but not to have to read them
all.

Discussions on this go back to 2008 and continue; meanwhile the number
of YANG modules ever increases making changes ever more expensive.

I like your idea but suspect that it will not gain traction.

Tom Petch

> Henning Rogge
>
> On Fri, Apr 28, 2017 at 10:41 PM, Xufeng Liu <Xufeng_Liu@jabil.com>
wrote:
> > Hi Henning,
> >
> > Please review if the attached change proposal is ok.
> > Thanks,
> > - Xufeng
> >
> >> -----Original Message-----
> >> From: Xufeng Liu
> >> Sent: Wednesday, April 26, 2017 9:18 AM
> >> To: 'Henning Rogge' <hrogge@gmail.com>
> >> Cc: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>;
Athanasios
> >> Kyparlis <Athanasios_Kyparlis@jabil.com>; parikhr@vmware.com;
> >> zhangmingui@huawei.com; Routing WG <rtgwg@ietf.org>
> >> Subject: RE: Routing directorate QA review of
draft-ietf-rtgwg-yang-vrrp
> >>
> >> Hi Henning,
> >>
> >> Yes. We will add some explanations.
> >> Thanks,
> >> - Xufeng
> >>
> >> > -----Original Message-----
> >> > From: Henning Rogge [mailto:hrogge@gmail.com]
> >> > Sent: Tuesday, April 25, 2017 9:50 AM
> >> > To: Xufeng Liu <Xufeng_Liu@jabil.com>
> >> > Cc: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>;
Athanasios
> >> > Kyparlis <Athanasios_Kyparlis@jabil.com>; parikhr@vmware.com;
> >> > zhangmingui@huawei.com; Routing WG <rtgwg@ietf.org>
> >> > Subject: Re: Routing directorate QA review of
> >> > draft-ietf-rtgwg-yang-vrrp
> >> >
> >> > On Tue, Apr 25, 2017 at 3:47 PM, Xufeng Liu
<Xufeng_Liu@jabil.com> wrote:
> >> > >
> >> > > Hi Henning,
> >> > >
> >> > >
> >> > >
> >> > > Thank you much for the review.
> >> > >
> >> > >
> >> > >
> >> > > You are right about the mapping for "address of the virtual
router".
> >> > > The
> >> > existing YANG data model for configuring and managing IP
addresses is
> >> > RFC7277, which augments the ietf-interfaces model specified by
> >> > RFC7223. This VRRP model follows the same paradigm. Such a
structure
> >> > is also VRRP protocols are usually implemented.
> >> >
> >> > Maybe the naming of the variables or the explanation of them
could be
> >> > improved to explicitly state this.
> >> >
> >> > Henning
> >> >
> >> > >
> >> > >
> >> > >
> >> > > We will fix the error in  Appendix A. in the next revision.
> >> > >
> >> > >
> >> > >
> >> > > Regards,
> >> > >
> >> > > - Xufeng
> >> > >
> >> > >
> >> > >
> >> > > From: Henning Rogge [mailto:hrogge@gmail.com]
> >> > > Sent: Monday, April 24, 2017 3:41 AM
> >> > > To: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>;
Xufeng Liu
> >> > > <Xufeng_Liu@jabil.com>; Athanasios Kyparlis
> >> > > <Athanasios_Kyparlis@jabil.com>; parikhr@vmware.com;
> >> > > zhangmingui@huawei.com
> >> > > Cc: Routing WG <rtgwg@ietf.org>
> >> > > Subject: Re: Routing directorate QA review of
> >> > > draft-ietf-rtgwg-yang-vrrp
> >> > >
> >> > >
> >> > >
> >> > > Hi,
> >> > >
> >> > >
> >> > >
> >> > > Jonathan Hardwick asked me to do an early review of the
> >> > > draft-ietf-rtgwg-
> >> > yang-vrrp document (currently revision 02) for the routing
directorate.
> >> > >
> >> > >
> >> > >
> >> > > The draft itself is pretty straight forward and compact,
especially
> >> > > when you
> >> > consider that a lot of text has to be repeated two or four times
> >> > (IPv4/IPv6, config vs. read-only state).
> >> > >
> >> > >
> >> > >
> >> > > But I had quite a bit of trouble mapping the phrases from the
new
> >> > > draft-ietf-
> >> > rtgwg-yang-vrrp-02 document to the existing VRRP documents (e.g.
RFC5798).
> >> > This might come from my unfamilarity with VRRP.
> >> > >
> >> > >
> >> > >
> >> > > The draft YANG model allows to read (if:interfaces-state) and
> >> > > configure
> >> > (if:interfaces) virtual IP addresses, but this does not seem to
be a
> >> > common phrase from the RFCs. Is it the same as "address of the
virtual
> >> > router" often mentioned in RFC5798?
> >> > >
> >> > >
> >> > >
> >> > > In addition to this, I found (I think) a typo or inconsistency
in Appendix A:
> >> > >
> >> > > the ascii art says "eth0" but tree says "eth1".
> >> > >
> >> > >
> >> > >
> >> > > Henning Rogge
> >> > >
> >> > >
> >> > >
> >> > > On Mon, Mar 27, 2017 at 5:43 PM, Jonathan Hardwick
> >> > <Jonathan.Hardwick@metaswitch.com> wrote:
> >> > >
> >> > > Hi Henning
> >> > >
> >> > >
> >> > >
> >> > > Please would you do a routing directorate early review of this
> >> > > draft?  Would
> >> > you be able to do it in 2 to 3 weeks?
> >> > >
> >> > >
> >> > >
> >> > > Many thanks
> >> > >
> >> > > Jon
> >> > >
> >> > >
> >> > >
> >> > >
> >> > >
> >> > > Please would you do a routing directorate QA review of this
draft?
> >> > >
> >> > > https://datatracker.ietf.org/doc/draft-ietf-rtgwg-yang-vrrp/
> >> > >
> >> > >
> >> > >
> >> > > The draft is still in the RTGWG and is ready for WG last call.
The
> >> > > WG chairs
> >> > have asked for a QA review from the directorate.  The following
link
> >> > provides guidance on QA reviews.
> >> > >
> >> > > https://trac.ietf.org/trac/rtg/wiki/RtgDirDocQa
> >> > >
> >> > >
> >> > >
> >> > >
> >> > >
> >> > >
>
> _______________________________________________
> rtgwg mailing list
> rtgwg@ietf.org
> https://www.ietf.org/mailman/listinfo/rtgwg


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To: Stewart Bryant <stewart@g3ysx.org.uk>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Alexey Melnikov <aamelnikov@fastmail.fm>, The IESG <iesg@ietf.org>
CC: "rtgwg-chairs@ietf.org" <rtgwg-chairs@ietf.org>, "draft-ietf-rtgwg-yang-key-chain@ietf.org" <draft-ietf-rtgwg-yang-key-chain@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>
Subject: Re: Alexey Melnikov's No Objection on draft-ietf-rtgwg-yang-key-chain-24: (with COMMENT)
Thread-Topic: Alexey Melnikov's No Objection on draft-ietf-rtgwg-yang-key-chain-24: (with COMMENT)
Thread-Index: AQHSxCUmTFYIG/K/pEGacNZogiEiVKHi6c6A
Date: Wed, 3 May 2017 18:14:14 +0000
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From: Alia Atlas <akatlas@gmail.com>
Date: Wed, 3 May 2017 14:30:42 -0400
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Subject: Fwd: Last Call: <draft-ietf-isis-l2bundles-04.txt> (Advertising L2 Bundle Member Link Attributes in IS-IS) to Proposed Standard
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--001a113c0e869d0909054ea2da46
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Dear RTGWG, OSPF WG & IDR WG,

I'd like to bring this IETF Last Call to your attention.  The method for
advertising
L2 bundle information via IS-IS described in this draft may be of interest
for other
protocols (OSPF,  BGP-LS) that may use it as precedent for how to advertise
such information if there is need in the future and consistency is desired
at that point.

Regards,
Alia


---------- Forwarded message ----------
From: The IESG <iesg-secretary@ietf.org>
Date: Wed, May 3, 2017 at 1:52 PM
Subject: Last Call: <draft-ietf-isis-l2bundles-04.txt> (Advertising L2
Bundle Member Link Attributes in IS-IS) to Proposed Standard
To: IETF-Announce <ietf-announce@ietf.org>
Cc: hannes@gredler.at, isis-chairs@ietf.org, isis-wg@ietf.org,
draft-ietf-isis-l2bundles@ietf.org, akatlas@gmail.com



The IESG has received a request from the IS-IS for IP Internets WG (isis)
to consider the following document:
- 'Advertising L2 Bundle Member Link Attributes in IS-IS'
  <draft-ietf-isis-l2bundles-04.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits
final comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2017-05-17. Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the
beginning of the Subject line to allow automated sorting.

Abstract


   There are deployments where the Layer 3 interface on which IS-IS
   operates is a Layer 2 interface bundle.  Existing IS-IS
   advertisements only support advertising link attributes of the Layer
   3 interface.  If entities external to IS-IS wish to control traffic
   flows on the individual physical links which comprise the Layer 2
   interface bundle link attribute information about the bundle members
   is required.

   This document introduces the ability for IS-IS to advertise the link
   attributes of layer 2 (L2) bundle members.





The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-isis-l2bundles/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-isis-l2bundles/ballot/

The following IPR Declarations may be related to this I-D:

   https://datatracker.ietf.org/ipr/2793/

--001a113c0e869d0909054ea2da46
Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr"><div>Dear RTGWG, OSPF WG &amp; IDR WG,</div><div><br></div=
><div>I&#39;d like to bring this IETF Last Call to your attention.=C2=A0 Th=
e method for advertising</div><div>L2 bundle information via IS-IS describe=
d in this draft may be of interest for other</div><div>protocols (OSPF, =C2=
=A0BGP-LS) that may use it as precedent for how to advertise</div><div>such=
 information if there is need in the future and consistency is desired at t=
hat point.</div><div><br></div><div>Regards,</div><div>Alia</div><div><br><=
/div><br><div class=3D"gmail_quote">---------- Forwarded message ----------=
<br>From: <b class=3D"gmail_sendername">The IESG</b> <span dir=3D"ltr">&lt;=
<a href=3D"mailto:iesg-secretary@ietf.org">iesg-secretary@ietf.org</a>&gt;<=
/span><br>Date: Wed, May 3, 2017 at 1:52 PM<br>Subject: Last Call: &lt;draf=
t-ietf-isis-l2bundles-04.txt&gt; (Advertising L2 Bundle Member Link Attribu=
tes in IS-IS) to Proposed Standard<br>To: IETF-Announce &lt;<a href=3D"mail=
to:ietf-announce@ietf.org">ietf-announce@ietf.org</a>&gt;<br>Cc: <a href=3D=
"mailto:hannes@gredler.at">hannes@gredler.at</a>, <a href=3D"mailto:isis-ch=
airs@ietf.org">isis-chairs@ietf.org</a>, <a href=3D"mailto:isis-wg@ietf.org=
">isis-wg@ietf.org</a>, <a href=3D"mailto:draft-ietf-isis-l2bundles@ietf.or=
g">draft-ietf-isis-l2bundles@ietf.org</a>, <a href=3D"mailto:akatlas@gmail.=
com">akatlas@gmail.com</a><br><br><br><br>
The IESG has received a request from the IS-IS for IP Internets WG (isis)<b=
r>
to consider the following document:<br>
- &#39;Advertising L2 Bundle Member Link Attributes in IS-IS&#39;<br>
=C2=A0 &lt;draft-ietf-isis-l2bundles-04.<wbr>txt&gt; as Proposed Standard<b=
r>
<br>
The IESG plans to make a decision in the next few weeks, and solicits<br>
final comments on this action. Please send substantive comments to the<br>
<a href=3D"mailto:ietf@ietf.org">ietf@ietf.org</a> mailing lists by 2017-05=
-17. Exceptionally, comments may be<br>
sent to <a href=3D"mailto:iesg@ietf.org">iesg@ietf.org</a> instead. In eith=
er case, please retain the<br>
beginning of the Subject line to allow automated sorting.<br>
<br>
Abstract<br>
<br>
<br>
=C2=A0 =C2=A0There are deployments where the Layer 3 interface on which IS-=
IS<br>
=C2=A0 =C2=A0operates is a Layer 2 interface bundle.=C2=A0 Existing IS-IS<b=
r>
=C2=A0 =C2=A0advertisements only support advertising link attributes of the=
 Layer<br>
=C2=A0 =C2=A03 interface.=C2=A0 If entities external to IS-IS wish to contr=
ol traffic<br>
=C2=A0 =C2=A0flows on the individual physical links which comprise the Laye=
r 2<br>
=C2=A0 =C2=A0interface bundle link attribute information about the bundle m=
embers<br>
=C2=A0 =C2=A0is required.<br>
<br>
=C2=A0 =C2=A0This document introduces the ability for IS-IS to advertise th=
e link<br>
=C2=A0 =C2=A0attributes of layer 2 (L2) bundle members.<br>
<br>
<br>
<br>
<br>
<br>
The file can be obtained via<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-isis-l2bundles/" rel=
=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/<wbr>doc/dra=
ft-ietf-isis-l2bundles/</a><br>
<br>
IESG discussion can be tracked via<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-isis-l2bundles/ballo=
t/" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/<wbr>=
doc/draft-ietf-isis-l2bundles/<wbr>ballot/</a><br>
<br>
The following IPR Declarations may be related to this I-D:<br>
<br>
=C2=A0 =C2=A0<a href=3D"https://datatracker.ietf.org/ipr/2793/" rel=3D"nore=
ferrer" target=3D"_blank">https://datatracker.ietf.org/<wbr>ipr/2793/</a><b=
r>
<br>
<br>
<br>
<br>
<br>
</div><br></div>

--001a113c0e869d0909054ea2da46--


From nobody Wed May  3 12:10:46 2017
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From: The IESG <iesg-secretary@ietf.org>
To: "IETF-Announce" <ietf-announce@ietf.org>
Subject: Protocol Action: 'Routing Key Chain YANG Data Model' to Proposed Standard (draft-ietf-rtgwg-yang-key-chain-24.txt)
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The IESG has approved the following document:
- 'Routing Key Chain YANG Data Model'
  (draft-ietf-rtgwg-yang-key-chain-24.txt) as Proposed Standard

This document is the product of the Routing Area Working Group.

The IESG contact persons are Alvaro Retana, Alia Atlas and Deborah
Brungard.

A URL of this Internet Draft is:
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-yang-key-chain/





Technical Summary

   This document describes a YANG data model for key chains.  Key
   chains have been implemented and deployed by most of
   network equipment vendors.  Providing a standard YANG model will
   facilitate automated key distribution and non-disruptive key
   rollover in a vendor independent way. 

Working Group Summary

   This draft has been thoroughly discussed in the WG, very good 
   feedback had been provided by SP and vendor community.
   The draft adoption and progress has received full support from the 
   WG. All comments have been addressed.  The draft is ready for 
  publication.

Document Quality

   The draft went to many rounds of reviews by YANG-Doctors as well as 
   implementors, which resulted in a very high quality document.
   There are existing implementations and multiple vendors have shown 
   significant interest in the topic.  
   Note that the most recent version for handling operational state in 
   the model may mean implementations need updates.

Personnel

   Jeff Tantsura is the Document Shepherd.
   Alia Atlas is the Responsible Area Director.

IESG Note

   The most recent version is to handle the very recent change in 
   recommendation for handling operational state in YANG models.  For 
   this model, there won't be system-learned operational state that 
   isn't tied to configuration state, so putting the state in as part of 
   the YANG model is the forward path.


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The Revised Datastore Draft (https://tools.ietf.org/html/draft-ietf-netmod-=
revised-datastores-01) is the latest approach to address this issue. Before=
 the solution is finalized, NETCONF/RESTCONF protocols are updated, and imp=
lementations are available, we still have the field duplications meanwhile.

Thanks,
- Xufeng


> -----Original Message-----
> From: t.petch [mailto:ietfa@btconnect.com]
> Sent: Wednesday, May 3, 2017 1:30 PM
> To: Henning Rogge <hrogge@gmail.com>; Xufeng Liu <Xufeng_Liu@jabil.com>
> Cc: Athanasios Kyparlis <Athanasios_Kyparlis@jabil.com>;
> parikhr@vmware.com; Routing WG <rtgwg@ietf.org>
> Subject: Re: Routing directorate QA review of draft-ietf-rtgwg-yang-vrrp
>=20
> ----- Original Message -----
> From: "Henning Rogge" <hrogge@gmail.com>
> Sent: Tuesday, May 02, 2017 7:49 AM
> >
> > yes I think the new changes improve the draft and make it easier to
> understand.
> >
> > I wonder if there is a way in YANG to prevent the duplication of all
> > the fields between "interface" and "interface-state"... putting the
> > common fields into a section of their own and refer to them twice,
> > once as "read only" and once "read-writeable".
>=20
> No:-(
>=20
> This has become a thorny and vexed question with lots of solutions whose
> benefits depend on where you are coming from with no consensus among the
> interested parties. NETCONF/YANG set out to support configuration which i=
s
> defined as something writeable. Read only, well it was not ignored but it=
 did
> take a back seat since SNMP was already handling that part of network
> management.  A requirement emerged to know what the results were of a
> configuration change.  I enable an interface; is it now enabled?  I set a=
n
> interface card to auto; what speed is it running at?  Clearly there are '=
twin'
> objects, sometimes triads or more.  Rather late in the day it emerged tha=
t in
> YANG read-only objects that are below a read-write object that has not be=
en
> written do not exist.  This led to the twin trees approach that is widely=
 used, one
> tree for read-only, one for read-write.
>=20
> Other dimensions of this problem are the need either for configuration to=
 come
> first and a hot-plugged card to pick up the configuration or for hot-plug=
ging to
> come first and then the card be configured; and for the box to provide de=
fault
> values to minimise the configuration needed and for the NMS to know what =
the
> defaults are but not to have to read them all.
>=20
> Discussions on this go back to 2008 and continue; meanwhile the number of
> YANG modules ever increases making changes ever more expensive.
>=20
> I like your idea but suspect that it will not gain traction.
>=20
> Tom Petch
>=20
> > Henning Rogge
> >
> > On Fri, Apr 28, 2017 at 10:41 PM, Xufeng Liu <Xufeng_Liu@jabil.com>
> wrote:
> > > Hi Henning,
> > >
> > > Please review if the attached change proposal is ok.
> > > Thanks,
> > > - Xufeng
> > >
> > >> -----Original Message-----
> > >> From: Xufeng Liu
> > >> Sent: Wednesday, April 26, 2017 9:18 AM
> > >> To: 'Henning Rogge' <hrogge@gmail.com>
> > >> Cc: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>;
> Athanasios
> > >> Kyparlis <Athanasios_Kyparlis@jabil.com>; parikhr@vmware.com;
> > >> zhangmingui@huawei.com; Routing WG <rtgwg@ietf.org>
> > >> Subject: RE: Routing directorate QA review of
> draft-ietf-rtgwg-yang-vrrp
> > >>
> > >> Hi Henning,
> > >>
> > >> Yes. We will add some explanations.
> > >> Thanks,
> > >> - Xufeng
> > >>
> > >> > -----Original Message-----
> > >> > From: Henning Rogge [mailto:hrogge@gmail.com]
> > >> > Sent: Tuesday, April 25, 2017 9:50 AM
> > >> > To: Xufeng Liu <Xufeng_Liu@jabil.com>
> > >> > Cc: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>;
> Athanasios
> > >> > Kyparlis <Athanasios_Kyparlis@jabil.com>; parikhr@vmware.com;
> > >> > zhangmingui@huawei.com; Routing WG <rtgwg@ietf.org>
> > >> > Subject: Re: Routing directorate QA review of
> > >> > draft-ietf-rtgwg-yang-vrrp
> > >> >
> > >> > On Tue, Apr 25, 2017 at 3:47 PM, Xufeng Liu
> <Xufeng_Liu@jabil.com> wrote:
> > >> > >
> > >> > > Hi Henning,
> > >> > >
> > >> > >
> > >> > >
> > >> > > Thank you much for the review.
> > >> > >
> > >> > >
> > >> > >
> > >> > > You are right about the mapping for "address of the virtual
> router".
> > >> > > The
> > >> > existing YANG data model for configuring and managing IP
> addresses is
> > >> > RFC7277, which augments the ietf-interfaces model specified by
> > >> > RFC7223. This VRRP model follows the same paradigm. Such a
> structure
> > >> > is also VRRP protocols are usually implemented.
> > >> >
> > >> > Maybe the naming of the variables or the explanation of them
> could be
> > >> > improved to explicitly state this.
> > >> >
> > >> > Henning
> > >> >
> > >> > >
> > >> > >
> > >> > >
> > >> > > We will fix the error in  Appendix A. in the next revision.
> > >> > >
> > >> > >
> > >> > >
> > >> > > Regards,
> > >> > >
> > >> > > - Xufeng
> > >> > >
> > >> > >
> > >> > >
> > >> > > From: Henning Rogge [mailto:hrogge@gmail.com]
> > >> > > Sent: Monday, April 24, 2017 3:41 AM
> > >> > > To: Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>;
> Xufeng Liu
> > >> > > <Xufeng_Liu@jabil.com>; Athanasios Kyparlis
> > >> > > <Athanasios_Kyparlis@jabil.com>; parikhr@vmware.com;
> > >> > > zhangmingui@huawei.com
> > >> > > Cc: Routing WG <rtgwg@ietf.org>
> > >> > > Subject: Re: Routing directorate QA review of
> > >> > > draft-ietf-rtgwg-yang-vrrp
> > >> > >
> > >> > >
> > >> > >
> > >> > > Hi,
> > >> > >
> > >> > >
> > >> > >
> > >> > > Jonathan Hardwick asked me to do an early review of the
> > >> > > draft-ietf-rtgwg-
> > >> > yang-vrrp document (currently revision 02) for the routing
> directorate.
> > >> > >
> > >> > >
> > >> > >
> > >> > > The draft itself is pretty straight forward and compact,
> especially
> > >> > > when you
> > >> > consider that a lot of text has to be repeated two or four times
> > >> > (IPv4/IPv6, config vs. read-only state).
> > >> > >
> > >> > >
> > >> > >
> > >> > > But I had quite a bit of trouble mapping the phrases from the
> new
> > >> > > draft-ietf-
> > >> > rtgwg-yang-vrrp-02 document to the existing VRRP documents (e.g.
> RFC5798).
> > >> > This might come from my unfamilarity with VRRP.
> > >> > >
> > >> > >
> > >> > >
> > >> > > The draft YANG model allows to read (if:interfaces-state) and
> > >> > > configure
> > >> > (if:interfaces) virtual IP addresses, but this does not seem to
> be a
> > >> > common phrase from the RFCs. Is it the same as "address of the
> virtual
> > >> > router" often mentioned in RFC5798?
> > >> > >
> > >> > >
> > >> > >
> > >> > > In addition to this, I found (I think) a typo or inconsistency
> in Appendix A:
> > >> > >
> > >> > > the ascii art says "eth0" but tree says "eth1".
> > >> > >
> > >> > >
> > >> > >
> > >> > > Henning Rogge
> > >> > >
> > >> > >
> > >> > >
> > >> > > On Mon, Mar 27, 2017 at 5:43 PM, Jonathan Hardwick
> > >> > <Jonathan.Hardwick@metaswitch.com> wrote:
> > >> > >
> > >> > > Hi Henning
> > >> > >
> > >> > >
> > >> > >
> > >> > > Please would you do a routing directorate early review of this
> > >> > > draft?  Would
> > >> > you be able to do it in 2 to 3 weeks?
> > >> > >
> > >> > >
> > >> > >
> > >> > > Many thanks
> > >> > >
> > >> > > Jon
> > >> > >
> > >> > >
> > >> > >
> > >> > >
> > >> > >
> > >> > > Please would you do a routing directorate QA review of this
> draft?
> > >> > >
> > >> > > https://datatracker.ietf.org/doc/draft-ietf-rtgwg-yang-vrrp/
> > >> > >
> > >> > >
> > >> > >
> > >> > > The draft is still in the RTGWG and is ready for WG last call.
> The
> > >> > > WG chairs
> > >> > have asked for a QA review from the directorate.  The following
> link
> > >> > provides guidance on QA reviews.
> > >> > >
> > >> > > https://trac.ietf.org/trac/rtg/wiki/RtgDirDocQa
> > >> > >
> > >> > >
> > >> > >
> > >> > >
> > >> > >
> > >> > >
> >
> > _______________________________________________
> > rtgwg mailing list
> > rtgwg@ietf.org
> > https://www.ietf.org/mailman/listinfo/rtgwg


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From: Ravi Singh <ravis@juniper.net>
To: "rtg-dir@ietf.org" <rtg-dir@ietf.org>
CC: "rtgwg@ietf.org" <rtgwg@ietf.org>, "draft-ietf-rtgwg-lne-model@ietf.org" <draft-ietf-rtgwg-lne-model@ietf.org>
Subject: Review of draft-ietf-rtgwg-lne-model-02
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Hi
I had been designated as the RTG-DIR reviewer for this draft.
I've reviewed the same.

This draft does a decent job of defining the logical-network-element module=
.

Some minor comments that should be addressed:
a.       Section 1.1: refers to expired drafts.
b.      Some TBDs need to be populated:
                                       i.            Security consideration=
s section
                                     ii.            An error-code in sectio=
n 6

Regards
Ravi


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<div class=3D"WordSection1">
<p class=3D"MsoNormal" style=3D"vertical-align:middle"><span style=3D"color=
:black">Hi<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"vertical-align:middle"><span style=3D"color=
:black">I had been designated as the RTG-DIR reviewer for this draft.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal" style=3D"vertical-align:middle"><span style=3D"color=
:black">I&#8217;ve reviewed the same.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"vertical-align:middle"><span style=3D"color=
:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"vertical-align:middle"><span style=3D"color=
:black">This draft does a decent job of defining the logical-network-elemen=
t module.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"vertical-align:middle"><span style=3D"color=
:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"vertical-align:middle"><span style=3D"color=
:black">Some minor comments that should be addressed:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.75in;text-indent:-.25in;mso-li=
st:l0 level2 lfo2;vertical-align:middle">
<![if !supportLists]><span style=3D"color:black"><span style=3D"mso-list:Ig=
nore">a.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:black">Section 1.1: ref=
ers to expired drafts.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.75in;text-indent:-.25in;mso-li=
st:l0 level2 lfo2;vertical-align:middle">
<![if !supportLists]><span style=3D"color:black"><span style=3D"mso-list:Ig=
nore">b.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:black">Some TBDs need t=
o be populated:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:81.0pt;text-indent:-81.0pt;mso-=
text-indent-alt:-.25in;mso-list:l0 level3 lfo3;vertical-align:middle">
<![if !supportLists]><span style=3D"color:black"><span style=3D"mso-list:Ig=
nore"><span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>i.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></spa=
n><![endif]><span style=3D"color:black">Security considerations section<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:81.0pt;text-indent:-81.0pt;mso-=
text-indent-alt:-.25in;mso-list:l0 level3 lfo3;vertical-align:middle">
<![if !supportLists]><span style=3D"color:black"><span style=3D"mso-list:Ig=
nore"><span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>ii.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></sp=
an><![endif]><span style=3D"color:black">An error-code in section 6<o:p></o=
:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards<o:p></o:p></p>
<p class=3D"MsoNormal">Ravi<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</body>
</html>

--_000_CY1PR05MB2521D35D61C3765946AD9A2EABEE0CY1PR05MB2521namp_--


From nobody Mon May  8 07:02:42 2017
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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 Routing Area Working Group of the IETF.

        Title           : A YANG Data Model for Virtual Router Redundancy Protocol (VRRP)
        Authors         : Xufeng Liu
                          Athanasios Kyparlis
                          Ravi Parikh
                          Acee Lindem
                          Mingui Zhang
	Filename        : draft-ietf-rtgwg-yang-vrrp-03.txt
	Pages           : 43
	Date            : 2017-05-08

Abstract:
   This document describes a data model for Virtual Router Redundancy
   Protocol (VRRP).  Both version 2 and version 3 of VRRP are covered.


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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-rtgwg-yang-vrrp-03
https://datatracker.ietf.org/doc/html/draft-ietf-rtgwg-yang-vrrp-03

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-rtgwg-yang-vrrp-03


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: Xufeng Liu <Xufeng_Liu@jabil.com>
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The updated revision is to address the comments from Rakek and Henning, and=
 to fix an error found by Martin.

Thanks,
- Xufeng

> -----Original Message-----
> From: rtgwg [mailto:rtgwg-bounces@ietf.org] On Behalf Of internet-
> drafts@ietf.org
> Sent: Monday, May 8, 2017 10:03 AM
> To: i-d-announce@ietf.org
> Cc: rtgwg@ietf.org
> Subject: I-D Action: draft-ietf-rtgwg-yang-vrrp-03.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 Routing Area Working Group of the IETF.
>=20
>         Title           : A YANG Data Model for Virtual Router Redundancy=
 Protocol
> (VRRP)
>         Authors         : Xufeng Liu
>                           Athanasios Kyparlis
>                           Ravi Parikh
>                           Acee Lindem
>                           Mingui Zhang
> 	Filename        : draft-ietf-rtgwg-yang-vrrp-03.txt
> 	Pages           : 43
> 	Date            : 2017-05-08
>=20
> Abstract:
>    This document describes a data model for Virtual Router Redundancy
>    Protocol (VRRP).  Both version 2 and version 3 of VRRP are covered.
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-rtgwg-yang-vrrp/
>=20
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-rtgwg-yang-vrrp-03
> https://datatracker.ietf.org/doc/html/draft-ietf-rtgwg-yang-vrrp-03
>=20
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-rtgwg-yang-vrrp-03
>=20
>=20
> Please note that it may take a couple of minutes from the time of submiss=
ion
> until the htmlized version and diff are available at tools.ietf.org.
>=20
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>=20
> _______________________________________________
> rtgwg mailing list
> rtgwg@ietf.org
> https://www.ietf.org/mailman/listinfo/rtgwg


From nobody Wed May 10 14:47:38 2017
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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 Routing Area Working Group of the IETF.

        Title           : Routing Area Common YANG Data Types
        Authors         : Xufeng Liu
                          Yingzhen Qu
                          Acee Lindem
                          Christian Hopps
                          Lou Berger
	Filename        : draft-ietf-rtgwg-routing-types-03.txt
	Pages           : 32
	Date            : 2017-05-10

Abstract:
   This document defines a collection of common data types using the
   YANG data modeling language.  These derived common types are designed
   to be imported by other modules defined in the routing area.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-routing-types/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-rtgwg-routing-types-03
https://datatracker.ietf.org/doc/html/draft-ietf-rtgwg-routing-types-03

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-rtgwg-routing-types-03


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: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, Alia Atlas <akatlas@gmail.com>, OSPF List <ospf@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>, "idr@ietf. org" <idr@ietf.org>
Subject: RE: [OSPF] Fwd: Last Call: <draft-ietf-isis-l2bundles-04.txt> (Advertising L2 Bundle Member Link Attributes in IS-IS) to Proposed Standard
Thread-Topic: [OSPF] Fwd: Last Call: <draft-ietf-isis-l2bundles-04.txt> (Advertising L2 Bundle Member Link Attributes in IS-IS) to Proposed Standard
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Date: Thu, 11 May 2017 20:35:10 +0000
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Alia Atlas <akatlas@gmail.com>, OSPF List <ospf@ietf.org>, "rtgwg@ietf.org" <rtgwg@ietf.org>, "idr@ietf. org" <idr@ietf.org>
Subject: Re: [OSPF] Fwd: Last Call: <draft-ietf-isis-l2bundles-04.txt> (Advertising L2 Bundle Member Link Attributes in IS-IS) to Proposed Standard
Thread-Topic: [OSPF] Fwd: Last Call: <draft-ietf-isis-l2bundles-04.txt> (Advertising L2 Bundle Member Link Attributes in IS-IS) to Proposed Standard
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Date: Thu, 11 May 2017 20:48:38 +0000
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Subject: Re: I-D Action: draft-ietf-rtgwg-routing-types-03.txt
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Acee

I don't understand what you are doing.

Martin suggested
"                                       Since it is based on an IANA
registry,
>should it be in a separate IANA-maintained module, like iana-if-type
>in RFC 7224?"

but you have not done that.  You have produced a separate module in
which IANA appears hundreds of times but that does not make it an
IANA-maintained module IMO.  Look at RFC7224 s.3 to see what I think is
missing.

Tom Petch


----- Original Message -----
From: "Acee Lindem (acee)" <acee@cisco.com>
Cc: <rtgwg@ietf.org>
Sent: Wednesday, May 10, 2017 10:54 PM
Subject: Re: I-D Action: draft-ietf-rtgwg-routing-types-03.txt


> This version addresses Stewart’s RTG Directorate comments and Radek’s
YANG
> Doctor comments. It also splits iana-routing-types into a separate
module.
>
> Thanks,
> Acee
>
> On 5/10/17, 5:47 PM, "rtgwg on behalf of internet-drafts@ietf.org"
> <rtgwg-bounces@ietf.org on behalf of internet-drafts@ietf.org> wrote:
>
> >
> >A New Internet-Draft is available from the on-line Internet-Drafts
> >directories.
> >This draft is a work item of the Routing Area Working Group of the
IETF.
> >
> >        Title           : Routing Area Common YANG Data Types
> >        Authors         : Xufeng Liu
> >                          Yingzhen Qu
> >                          Acee Lindem
> >                          Christian Hopps
> >                          Lou Berger
> > Filename        : draft-ietf-rtgwg-routing-types-03.txt
> > Pages           : 32
> > Date            : 2017-05-10
> >
> >Abstract:
> >   This document defines a collection of common data types using the
> >   YANG data modeling language.  These derived common types are
designed
> >   to be imported by other modules defined in the routing area.
> >
> >
> >The IETF datatracker status page for this draft is:
> >https://datatracker.ietf.org/doc/draft-ietf-rtgwg-routing-types/
> >
> >There are also htmlized versions available at:
> >https://tools.ietf.org/html/draft-ietf-rtgwg-routing-types-03
>
>https://datatracker.ietf.org/doc/html/draft-ietf-rtgwg-routing-types-03
> >
> >A diff from the previous version is available at:
> >https://www.ietf.org/rfcdiff?url2=draft-ietf-rtgwg-routing-types-03
> >
> >
> >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/
> >
> >_______________________________________________
> >rtgwg mailing list
> >rtgwg@ietf.org
> >https://www.ietf.org/mailman/listinfo/rtgwg
>
> _______________________________________________
> rtgwg mailing list
> rtgwg@ietf.org
> https://www.ietf.org/mailman/listinfo/rtgwg
>


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From nobody Fri May 12 13:58:46 2017
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From: "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>
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CC: rtgwg@ietf.org, LITKOWSKI Stephane SCE/IBNF <stephane.litkowski@orange.com>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, "pfrpfr@gmail.com" <pfrpfr@gmail.com>
Subject: Request for WG adoption of draft-bashandy-rtgwg-segment-routing-uloop, 
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Hi,

We would like to request the wg adoption of 
"draft-bashandy-rtgwg-segment-routing-uloop". This draft replaces 
draft-francois-rtgwg-segment-routing-uloop-01

The draft was presented last summer during IETF-96 in Berlin

Thanks

Ahmed


From nobody Fri May 12 14:12:44 2017
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From: "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>
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To: chrisbowers.ietf@gmail.com, Jeff Tantsura <jefftant.ietf@gmail.com>
CC: "rtgwg@ietf.org" <rtgwg@ietf.org>, LITKOWSKI Stephane SCE/IBNF <stephane.litkowski@orange.com>, DECRAENE Bruno IMT/OLN <bruno.decraene@orange.com>, "pfrpfr@gmail.com" <pfrpfr@gmail.com>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>
Subject: Request for WG adoption of draft-bashandy-rtgwg-segment-routing-ti-lfa
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Hi

We would like to request the WG adoption of 
draft-bashandy-rtgwg-segment-routing-ti-lfa-00. The draft replaces 
draft-francois-rtgwg-segment-routing-ti-lfa-04

The draft was presented in IETF-96 in Berlin last summer

Thanks

Ahmed


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To: Susan Hares <shares@ndzh.com>, "'Lou Berger'" <lberger@labn.net>, "rtgwg@ietf.org" <rtgwg@ietf.org>
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From nobody Tue May 16 09:00:56 2017
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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 Routing Area Working Group of the IETF.

        Title           : Routing Area Common YANG Data Types
        Authors         : Xufeng Liu
                          Yingzhen Qu
                          Acee Lindem
                          Christian Hopps
                          Lou Berger
	Filename        : draft-ietf-rtgwg-routing-types-04.txt
	Pages           : 33
	Date            : 2017-05-16

Abstract:
   This document defines a collection of common data types using the
   YANG data modeling language.  These derived common types are designed
   to be imported by other modules defined in the routing area.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-routing-types/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-rtgwg-routing-types-04
https://datatracker.ietf.org/doc/html/draft-ietf-rtgwg-routing-types-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-rtgwg-routing-types-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/


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From nobody Wed May 17 00:57:14 2017
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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 Routing Area Working Group of the IETF.

        Title           : Destination/Source Routing
        Authors         : David Lamparter
                          Anton Smirnov
	Filename        : draft-ietf-rtgwg-dst-src-routing-04.txt
	Pages           : 18
	Date            : 2017-05-17

Abstract:
   This note specifies using packets' source addresses in route lookups
   as additional qualifier to be used in route lookup.  This applies to
   IPv6 [RFC2460] in general with specific considerations for routing
   protocol left for separate documents.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-dst-src-routing/

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From nobody Mon May 22 05:37:59 2017
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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 Routing Area Working Group of the IETF.

        Title           : Abstract
        Authors         : Ahmed Bashandy
                          Clarence Filsfils
                          Prodosh Mohapatra
	Filename        : draft-ietf-rtgwg-bgp-pic-04.txt
	Pages           : 30
	Date            : 2017-05-22

Abstract:
In the network comprising thousands of iBGP peers exchanging millions
of routes, many routes are reachable via more than one next-hop.
Given the large scaling targets, it is desirable to restore traffic
after failure in a time period that does not depend on the number of
BGP prefixes. In this document we proposed an architecture by which
traffic can be re-routed to ECMP or pre-calculated backup paths in a
timeframe that does not depend on the number of BGP prefixes. The
objective is achieved through organizing the forwarding data
structures in a hierarchical manner and sharing forwarding elements
among the maximum possible number of routes. The proposed technique
achieves prefix independent convergence while ensuring incremental
deployment, complete automation, and zero management and provisioning
effort. It is noteworthy to mention that the benefits of BGP-PIC are
hinged on the existence of more than one path whether as ECMP or
primary-backup.


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From nobody Tue May 23 01:53:06 2017
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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 Routing Area Working Group of the IETF.

        Title           : Link State protocols SPF trigger and delay algorithm impact on IGP micro-loops
        Authors         : Stephane Litkowski
                          Bruno Decraene
                          Martin Horneffer
	Filename        : draft-ietf-rtgwg-spf-uloop-pb-statement-04.txt
	Pages           : 14
	Date            : 2017-05-23

Abstract:
   A micro-loop is a packet forwarding loop that may occur transiently
   among two or more routers in a hop-by-hop packet forwarding paradigm.

   In this document, we are trying to analyze the impact of using
   different Link State IGP implementations in a single network in
   regards of micro-loops.  The analysis is focused on the SPF triggers
   and SPF delay algorithm.



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Date: Wed, 24 May 2017 01:18:12 -0700
Subject: Re: Request for WG adoption of draft-bashandy-rtgwg-segment-routing-ti-lfa
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>, <chrisbowers.ietf@gmail.com>
CC: "rtgwg@ietf.org" <rtgwg@ietf.org>, LITKOWSKI Stephane SCE/IBNF <stephane.litkowski@orange.com>, DECRAENE Bruno IMT/OLN <bruno.decraene@orange.com>, "pfrpfr@gmail.com" <pfrpfr@gmail.com>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>
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Hi Ahmed,

I=E2=80=99ll start the process, you will see early review comments coming your wa=
y.
There should be at least 3 implementations of TI-LFA (to my knowledge), wou=
ld you please gather this data and if possible implementation report and inc=
lude it in the draft?

Thanks!
=20
Cheers,
Jeff
=20

On 5/12/17, 14:08, "Ahmed Bashandy (bashandy)" <bashandy@cisco.com> wrote:

    Hi
   =20
    We would like to request the WG adoption of=20
    draft-bashandy-rtgwg-segment-routing-ti-lfa-00. The draft replaces=20
    draft-francois-rtgwg-segment-routing-ti-lfa-04
   =20
    The draft was presented in IETF-96 in Berlin last summer
   =20
    Thanks
   =20
    Ahmed
   =20
   =20



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Subject: Re: Request for WG adoption of draft-bashandy-rtgwg-segment-routing-uloop,
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: "Ahmed Bashandy (bashandy)" <bashandy@cisco.com>, <chrisbowers.ietf@gmail.com>
CC: <rtgwg@ietf.org>, LITKOWSKI Stephane SCE/IBNF <stephane.litkowski@orange.com>, "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, "pfrpfr@gmail.com" <pfrpfr@gmail.com>
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Thread-Topic: Request for WG adoption of draft-bashandy-rtgwg-segment-routing-uloop,
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Hi Ahmed,

I=E2=80=99ll start the process, you will see early review comments coming your wa=
y.
=20
Cheers,
Jeff

On 5/12/17, 13:54, "Ahmed Bashandy (bashandy)" <bashandy@cisco.com> wrote:

    Hi,
   =20
    We would like to request the wg adoption of=20
    "draft-bashandy-rtgwg-segment-routing-uloop". This draft replaces=20
    draft-francois-rtgwg-segment-routing-uloop-01
   =20
    The draft was presented last summer during IETF-96 in Berlin
   =20
    Thanks
   =20
    Ahmed
   =20
   =20



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Subject: Yangdoctors early review of draft-ietf-rtgwg-routing-types-04
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Reviewer: Radek Krejčí
Review result: Ready with Nits

I have reviewed changes made to draft-ietf-rtgwg-routing-types between revision 02 and 04 (04 was published just a week after 03). The main change is splitting the module into 2 modules: ietf-routing-types and iana-routing-types.

iana-routing-types:
- since it is IANA-maintained module, IANA should be the 'organization' and also the 'contact' value should be changed accordingly (see iana-if-type)

ietf-routing-types:
- please follow the contact template available in RFC 6087 Appendix B (or RFC6087bis, Appendix C)

draft text:
- if iana-routing-types is supposed to be IANA-maintained module, isn't IANA also supposed to be XML registrant contact (IANA Considerations section)? 
- my fault from previous review - since the module imports ietf-yang-types, it MUST contain reference to its RFC, which is RFC 6991 (not RFC 6021 as I wrote in my review). So move RFC 6991 reference from Informative references section into Normative references where it will replace reference to RFC 6021.

Radek


From nobody Wed May 24 08:06:31 2017
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Date: Wed, 24 May 2017 08:06:06 -0700
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Subject: Re: Request for WG adoption of draft-bashandy-rtgwg-segment-routing-ti-lfa
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I know of 4 implementation by Cisco: 2 ISIS on IOS-XE and IOS-XR and 2 
OSPF on IOS-XE and IOS-XR


If you know of any other implementations it would be great to share them

Ahmed

On 5/24/2017 1:18 AM, Jeff Tantsura wrote:
> Hi Ahmed,
>
> I’ll start the process, you will see early review comments coming your way.
> There should be at least 3 implementations of TI-LFA (to my knowledge), would you please gather this data and if possible implementation report and include it in the draft?
>
> Thanks!
>   
> Cheers,
> Jeff
>   
>
> On 5/12/17, 14:08, "Ahmed Bashandy (bashandy)" <bashandy@cisco.com> wrote:
>
>      Hi
>      
>      We would like to request the WG adoption of
>      draft-bashandy-rtgwg-segment-routing-ti-lfa-00. The draft replaces
>      draft-francois-rtgwg-segment-routing-ti-lfa-04
>      
>      The draft was presented in IETF-96 in Berlin last summer
>      
>      Thanks
>      
>      Ahmed
>      
>      
>
>


From nobody Wed May 24 09:15:44 2017
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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 Routing Area Working Group of the IETF.

        Title           : Routing Area Common YANG Data Types
        Authors         : Xufeng Liu
                          Yingzhen Qu
                          Acee Lindem
                          Christian Hopps
                          Lou Berger
	Filename        : draft-ietf-rtgwg-routing-types-05.txt
	Pages           : 33
	Date            : 2017-05-24

Abstract:
   This document defines a collection of common data types using the
   YANG data modeling language.  These derived common types are designed
   to be imported by other modules defined in the routing area.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-routing-types/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-rtgwg-routing-types-05
https://datatracker.ietf.org/doc/html/draft-ietf-rtgwg-routing-types-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-rtgwg-routing-types-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 nobody Thu May 25 12:10:38 2017
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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 Routing Area Working Group of the IETF.

        Title           : BGP Prefix Independent Convergence
        Authors         : Ahmed Bashandy
                          Clarence Filsfils
                          Prodosh Mohapatra
	Filename        : draft-ietf-rtgwg-bgp-pic-05.txt
	Pages           : 30
	Date            : 2017-05-25

Abstract:
In the network comprising thousands of iBGP peers exchanging millions
of routes, many routes are reachable via more than one next-hop.
Given the large scaling targets, it is desirable to restore traffic
after failure in a time period that does not depend on the number of
BGP prefixes. In this document we proposed an architecture by which
traffic can be re-routed to ECMP or pre-calculated backup paths in a
timeframe that does not depend on the number of BGP prefixes. The
objective is achieved through organizing the forwarding data
structures in a hierarchical manner and sharing forwarding elements
among the maximum possible number of routes. The proposed technique
achieves prefix independent convergence while ensuring incremental
deployment, complete automation, and zero management and provisioning
effort. It is noteworthy to mention that the benefits of BGP-PIC are
hinged on the existence of more than one path whether as ECMP or
primary-backup.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-rtgwg-bgp-pic/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-rtgwg-bgp-pic-05
https://datatracker.ietf.org/doc/html/draft-ietf-rtgwg-bgp-pic-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-rtgwg-bgp-pic-05


Please note that it may take a couple of minutes from the time of submission
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From nobody Tue May 30 06:55:05 2017
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From: Stewart Bryant <stewart@g3ysx.org.uk>
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Subject: Rtgdir early review of draft-bashandy-rtgwg-segment-routing-uloop-00
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Reviewer: Stewart Bryant
Review result: Has Issues


I have been asked to perform an early review of this document on
behalf of the Routing Directorate.

Summary:

A document on this subject is something that the WG should publish,
but I think that there are number of issues that the WG need to
discuss and reach consensus on before deciding whether or not they
should adopt this draft as a starting point for that work.


Major Issues:

Before I get into the substance I am surprised that there are no IPR
disclosures. In an earlier and related work
(draft-francois-segment-routing-ti-lfa-00) there were three IPR
disclosures. 

The work has four basic components, the concept of resolving the
problem of P and Q being non-adjacent, the use of SR to solve the
non-adjacency, the use of the post convergence path following failure
and the applicability of these techniques to an SR network. The first
and second points seem of utility in non-SR networks, and so I am
surprised that they are not called out as such, in the first case
perhaps with consideration to strategically places RSVP tunnels, or
binding segments.

The issue of mapping repair path to the post convergence path to the
something that has always concerned me in this concept. It is true
that traffic that always passes through the PLR will experience the
properties the authors describe, but not all traffic will pass through
the PLR post convergence. The post failure path will be topology
dependent, and may take a different path from the point of ingress.

I am also concerned that the authors do not discuss the need for loop
free convergence, since although traffic going through the repair path
will be loop-free, traffic arriving at the PLR might not be. Consider
for example a topology fragment that looks like a clock with a router
at each minute. Traffic enters at 9 o'clock, leave at 3 o'clock and
goes via 12 o'clock and 12 o'clock fails.  The routers 9..12 will
re-converge at different times and this may give rise to the
micro-looping of traffic trying to get to the PLR. A summary of the
problem and a pointer to the companion draft may be sufficient.

Finally on the basic concept it would be good to state up from whether
the proposal is constrained solely to SR networks, or whether the
authors believe that the concept is of wider applicability. It see no
reason why it would be constrained to only work on SR networks.

There is no discussion of multiple failures, nor as far as I can see
of failures that are worse than anticipated. This is an important
point that needs to be established early. Some methods, (MRT)
intrinsically address multiple failures, others (NV) intrinsically
exclude them. Simple LFA needs a supervisor to quickly abandon all
hope when they occur.

In an SR network the paths used are not the shortest paths, they are a
collection of shortest paths, so there needs to be some discussion on
the interaction between the SR paths and repair paths to consider
whether it is unconditionally safe against forwarding loops. It would
presumably be so if the authors borrowed the concept of repair
addresses rather than normal forwarding addresses from not-via, but I
don't think they have done this.

There should also be some discussion on the original path constraints
that are applicable to the repair. Presumably the ingress node
constrained the traffic to go though failed node F for a reason. If
the repair is unconstrained that reason could be violated, but this is
not discussed in the text.


In the Security section you say:

   The behavior described in this document is internal functionality
   to a router that result in the ability to guarantee an upper bound
   on the time taken to restore traffic flow upon the failure of a
   directly connected link or node. As such no additional security
   risk is introduced by using the mechanisms proposed in this
   document.


SB> I am not sure that the above is correct. There may be a security
reason
SB> why a packet was steered along a path which breaks when you use
this
SB> technique.

In the conclusion you say:

   The
   mechanism is able to calculate the backup path irrespective of the
   topology as long as the topology is sufficiently redundant.


SB> That is certainly true in classic. I am not sure this is
universally 
SB> true under SR which includes the use of non-shortest path and 
SB> binding segments.



Minor issues:

   For each destination in the network, TI-LFA prepares a data-plane
   switch-over to be activated upon detection of the failure of a
   link used to reach the destination.  

SB> To make the scaling clearer to the reader, I think you need
SB> to make it clear that for each protected link, you determine
SB> the repair needed to reach every destination reachable over that
SB> link. You sort of say that, but it's a bit hidden.

   We provide the TI-LFA approach that achieves guaranteed coverage
   against link, node, and local SRLG failure, in any IGP network,
   relying on the flexibility of SR.

SB> Should that be any SINGLE link.... failure?

In the text (and the text that follows)

   To do so, S applies a "NEXT" operation on Adj(S-F) and then two
   consecutive "PUSH" operations: first it pushes a node segment for
F,
   and then it pushes a protection list allowing to reach F while
   bypassing S-F.

You need to reference the SR operations.

Also you are considering Adj segments, and presumably they were there
for a reason, but you do not discuss that.

In 5.3.1 and 5.3.2 you have a list of conditions, but do not make it
clear whether any or all must be true.

Nits

1. Introduction

   Segment Routing aims at supporting services with tight SLA
   guarantees [1]. This document provides a local repair mechanism
   relying on SR-capable of restoring end-to-end connectivity in the
   case of a sudden failure of a network component.

SB> Grammar needs a little work in the last sentence.

In Fig 1, I assume that the blobs are network fragments.

In the conclusion you say:
   This document proposes a mechanism that is able to pre-calculate a
   backup path for every primary path so as to be able to protect
   against the failure of a directly connected link or node. 
SB> you need to add SRLG


From nobody Tue May 30 07:06:00 2017
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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 Routing Area Working Group of the IETF.

        Title           : A YANG Data Model for Virtual Router Redundancy Protocol (VRRP)
        Authors         : Xufeng Liu
                          Athanasios Kyparlis
                          Ravi Parikh
                          Acee Lindem
                          Mingui Zhang
	Filename        : draft-ietf-rtgwg-yang-vrrp-04.txt
	Pages           : 43
	Date            : 2017-05-30

Abstract:
   This document describes a data model for Virtual Router Redundancy
   Protocol (VRRP).  Both version 2 and version 3 of VRRP are covered.


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

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https://datatracker.ietf.org/doc/html/draft-ietf-rtgwg-yang-vrrp-04

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