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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Mon, 5 Dec 2016 15:16:05 -0500
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Subject: [Pals] Fwd: [mpls] Fast Reroute for Node Protection in LDP-based LSPs
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This draft (draft-esale-mpls-ldp-node-frr) may be of interest to those of
you on the PALS list. Please see below and post any comments to the
mpls@ietf.org list.

Thanks,
Andy

---------- Forwarded message ----------
From: Santosh Esale <sesale@juniper.net>
Date: Mon, Dec 5, 2016 at 2:59 PM
Subject: [mpls] Fast Reroute for Node Protection in LDP-based LSPs
To: "rtgwg@ietf.org" <rtgwg@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>


Hello Everyone,
                           We have presented the draft -
draft-esale-mpls-ldp-node-frr =E2=80=93 in
MPLS working group in three IETF meetings including the latest one at Seul.
However, as the draft is of interest to routing working too, we are
initiating this
thread to solicit feedbacks from the routing working group. Please let us
know
your comments.

Presentations -
https://www.ietf.org/proceedings/93/slides/slides-93-mpls-3.pdf
https://www.ietf.org/proceedings/94/slides/slides-94-mpls-3.pptx
https://www.ietf.org/proceedings/97/slides/slides-
97-mpls-08-ti-frr-ietf-97-00.pptx

Thanks,
Santosh (on behalf of authors)

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

--001a113cfb58557c6d0542eef6c8
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<div dir=3D"ltr"><div>This draft (<span style=3D"white-space:pre-wrap">draf=
t-esale-mpls-ldp-node-</span><wbr style=3D"white-space:pre-wrap"><span styl=
e=3D"white-space:pre-wrap">frr) may be of interest to those of you on the P=
ALS list. Please see below and post any comments to the <a href=3D"mailto:m=
pls@ietf.org">mpls@ietf.org</a> list.</span></div><div><span style=3D"white=
-space:pre-wrap"><br></span></div><div><span style=3D"white-space:pre-wrap"=
>Thanks,</span></div><div><span style=3D"white-space:pre-wrap">Andy</span><=
/div><br><div class=3D"gmail_quote">---------- Forwarded message ----------=
<br>From: <b class=3D"gmail_sendername">Santosh Esale</b> <span dir=3D"ltr"=
>&lt;<a href=3D"mailto:sesale@juniper.net">sesale@juniper.net</a>&gt;</span=
><br>Date: Mon, Dec 5, 2016 at 2:59 PM<br>Subject: [mpls] Fast Reroute for =
Node Protection in LDP-based LSPs<br>To: &quot;<a href=3D"mailto:rtgwg@ietf=
.org">rtgwg@ietf.org</a>&quot; &lt;<a href=3D"mailto:rtgwg@ietf.org">rtgwg@=
ietf.org</a>&gt;, &quot;<a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>&=
quot; &lt;<a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>&gt;<br><br><br=
>



<div style=3D"word-wrap:break-word">
<div style=3D"color:rgb(0,0,0);font-family:Calibri,sans-serif;font-size:14p=
x">
Hello Everyone,</div>
<div><font face=3D"Calibri,sans-serif" style=3D"color:rgb(0,0,0)">=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0We have presented the draft -=C2=A0</font><span style=3D"w=
hite-space:pre-wrap">draft-esale-mpls-ldp-node-<wbr>frr =E2=80=93 in
</span></div>
<div><span style=3D"white-space:pre-wrap">MPLS working group in three IETF =
meetings including the latest one at Seul.=C2=A0</span></div>
<div><span style=3D"white-space:pre-wrap">However, as the draft is of inter=
est to routing working
</span><span style=3D"white-space:pre-wrap">too, we are initiating this=C2=
=A0</span></div>
<div><span style=3D"white-space:pre-wrap">thread to solicit feedbacks from =
the routing working group.=C2=A0Please let us know
</span></div>
<div><span style=3D"white-space:pre-wrap">your comments.</span></div>
<div><span style=3D"white-space:pre-wrap"><br>
</span></div>
<div>Presentations -=C2=A0</div>
<div>
<div><a href=3D"https://www.ietf.org/proceedings/93/slides/slides-93-mpls-3=
.pdf" target=3D"_blank">https://www.ietf.org/<wbr>proceedings/93/slides/sli=
des-<wbr>93-mpls-3.pdf</a></div>
<div><a href=3D"https://www.ietf.org/proceedings/94/slides/slides-94-mpls-3=
.pptx" target=3D"_blank">https://www.ietf.org/<wbr>proceedings/94/slides/sl=
ides-<wbr>94-mpls-3.pptx</a></div>
</div>
<div><span style=3D"white-space:pre-wrap"><a href=3D"https://www.ietf.org/p=
roceedings/97/slides/slides-97-mpls-08-ti-frr-ietf-97-00.pptx" target=3D"_b=
lank">https://www.ietf.org/<wbr>proceedings/97/slides/slides-<wbr>97-mpls-0=
8-ti-frr-ietf-97-00.<wbr>pptx</a></span></div>
<div><br>
</div>
<div>Thanks,</div>
<div style=3D"color:rgb(0,0,0)">
<div style=3D"font-family:Calibri,sans-serif;font-size:14px">Santosh (on be=
half of authors)</div>
</div>
</div>

<br>______________________________<wbr>_________________<br>
mpls mailing list<br>
<a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/mpls" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/mpls</a><br>
<br></div><br></div>

--001a113cfb58557c6d0542eef6c8--


From nobody Mon Dec  5 16:30:25 2016
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Subject: [Pals] Review of draft-ietf-pals-endpoint-fast-protection-04
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Reviewer: David Black
Review result: Ready with Issues

I've reviewed this document as part of TSV-ART's ongoing effort to
review key IETF documents. These comments were written primarily for
the transport area directors, but are copied to the document's authors
for their information and to allow them to address any issues raised.
When done at the time of IETF Last Call, the authors should consider
this review together with any other last-call comments they receive.
Please always CC tsv-art@ietf.org if you reply to or forward this
review.

This draft specifies local pseudowire (PW) repair mechanisms to
quickly react to PW egress failures by rerouting traffic around the
failure until slower-to-react repair mechanisms at larger scope are
able to effect longer term repairs, e.g., via network topology
changes.

-- TSV-ART review comments:

I found a couple of minor transport-related issues, both of which
should be resolvable with modest amounts of additional explanation:

* ECMP: The ECMP discussion in Section 4.1 on Applicability takes a
conservative approach to avoiding packet reordering by recommending
(SHOULD) that the entire ECMP set be rerouted as part of local repair.
 It's not clear what sort of ECMP is involved, as that acronym is used
without a reference (or even expansion), so I'd suggest citing a
reference.   If the ECMP used is flow-aware so that reordering across
ECMP branches within an ECMP set does not cause reordering within any
of the flows involved, then it ought to be safe from a reordering
perspective to reroute an ECMP branch or set of branches that are less
than the full ECMP set, although such partial rerouting could cause
potentially undesirable forwarding latency differences within the ECMP
set.  This ought to be discussed, as situations in which rerouting the
entire ECMP bundle is overly conservative seem likely to arise in
practice.

* Traffic Engineering: Considering the intended speed of local repair,
"order of tens of milliseconds" in the abstract, the bandwidth used by
the repair paths has to be provisioned in advance of any failure that
causes repair path usage - traffic engineering is a likely means of
provisioning that bandwidth.  I see "TE domain," "TE metric" and "TE
path," which I assume refer to Traffic Engineering, but that TE
acronym is not expanded, and I did not find text requiring traffic
engineering and/or advance (bandwidth) provisioning of repair paths. 
I assume that this advance bandwidth provisioning of repair paths is
intended as part of local repair, as not doing that invites immediate
repair path failure due to lack of forwarding resources, which is
definitely not desired.  A sentence or two ought to be added to point
this bandwidth provisioning requirement out, possibly in Section 4.1
(Applicability).  Adding that text would also reinforce the conclusion
in the Security Considerations section that local repair reroutes are
not a security threat, as the new text would add the rationale that
local repair reroutes are anticipated and planned for by the network
operator's traffic engineering.

--  Other comments:

* Having found two acronyms that were not expanded, I'd suggest a
general look for such acronyms.   OTOH, this is an area of network
technology where many acronyms are in common use, and hence expansion
of every acronym on first use may be excessive - among the ways of
avoiding this could be citation of a reference at the start of Section
3 where commonly used PW terms and acronyms are defined.



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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Tue, 6 Dec 2016 07:50:45 -0500
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Subject: Re: [Pals] Review of draft-ietf-pals-endpoint-fast-protection-04
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--94eb2c091a628e1c5d0542fcdb1d
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David,

Thanks for your review!

Cheers,
Andy

On Mon, Dec 5, 2016 at 7:30 PM, IETF Secretariat <
ietf-secretariat-reply@ietf.org> wrote:

> Reviewer: David Black
> Review result: Ready with Issues
>
> I've reviewed this document as part of TSV-ART's ongoing effort to
> review key IETF documents. These comments were written primarily for
> the transport area directors, but are copied to the document's authors
> for their information and to allow them to address any issues raised.
> When done at the time of IETF Last Call, the authors should consider
> this review together with any other last-call comments they receive.
> Please always CC tsv-art@ietf.org if you reply to or forward this
> review.
>
> This draft specifies local pseudowire (PW) repair mechanisms to
> quickly react to PW egress failures by rerouting traffic around the
> failure until slower-to-react repair mechanisms at larger scope are
> able to effect longer term repairs, e.g., via network topology
> changes.
>
> -- TSV-ART review comments:
>
> I found a couple of minor transport-related issues, both of which
> should be resolvable with modest amounts of additional explanation:
>
> * ECMP: The ECMP discussion in Section 4.1 on Applicability takes a
> conservative approach to avoiding packet reordering by recommending
> (SHOULD) that the entire ECMP set be rerouted as part of local repair.
>  It's not clear what sort of ECMP is involved, as that acronym is used
> without a reference (or even expansion), so I'd suggest citing a
> reference.   If the ECMP used is flow-aware so that reordering across
> ECMP branches within an ECMP set does not cause reordering within any
> of the flows involved, then it ought to be safe from a reordering
> perspective to reroute an ECMP branch or set of branches that are less
> than the full ECMP set, although such partial rerouting could cause
> potentially undesirable forwarding latency differences within the ECMP
> set.  This ought to be discussed, as situations in which rerouting the
> entire ECMP bundle is overly conservative seem likely to arise in
> practice.
>
> * Traffic Engineering: Considering the intended speed of local repair,
> "order of tens of milliseconds" in the abstract, the bandwidth used by
> the repair paths has to be provisioned in advance of any failure that
> causes repair path usage - traffic engineering is a likely means of
> provisioning that bandwidth.  I see "TE domain," "TE metric" and "TE
> path," which I assume refer to Traffic Engineering, but that TE
> acronym is not expanded, and I did not find text requiring traffic
> engineering and/or advance (bandwidth) provisioning of repair paths.
> I assume that this advance bandwidth provisioning of repair paths is
> intended as part of local repair, as not doing that invites immediate
> repair path failure due to lack of forwarding resources, which is
> definitely not desired.  A sentence or two ought to be added to point
> this bandwidth provisioning requirement out, possibly in Section 4.1
> (Applicability).  Adding that text would also reinforce the conclusion
> in the Security Considerations section that local repair reroutes are
> not a security threat, as the new text would add the rationale that
> local repair reroutes are anticipated and planned for by the network
> operator's traffic engineering.
>
> --  Other comments:
>
> * Having found two acronyms that were not expanded, I'd suggest a
> general look for such acronyms.   OTOH, this is an area of network
> technology where many acronyms are in common use, and hence expansion
> of every acronym on first use may be excessive - among the ways of
> avoiding this could be citation of a reference at the start of Section
> 3 where commonly used PW terms and acronyms are defined.
>
>
>

--94eb2c091a628e1c5d0542fcdb1d
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">David,<div><br></div><div>Thanks for your review!</div><di=
v><br></div><div>Cheers,</div><div>Andy</div><div class=3D"gmail_extra"><br=
><div class=3D"gmail_quote">On Mon, Dec 5, 2016 at 7:30 PM, IETF Secretaria=
t <span dir=3D"ltr">&lt;<a href=3D"mailto:ietf-secretariat-reply@ietf.org" =
target=3D"_blank">ietf-secretariat-reply@ietf.o<wbr>rg</a>&gt;</span> wrote=
:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex">Reviewer: David Black<br>
Review result: Ready with Issues<br>
<br>
I&#39;ve reviewed this document as part of TSV-ART&#39;s ongoing effort to<=
br>
review key IETF documents. These comments were written primarily for<br>
the transport area directors, but are copied to the document&#39;s authors<=
br>
for their information and to allow them to address any issues raised.<br>
When done at the time of IETF Last Call, the authors should consider<br>
this review together with any other last-call comments they receive.<br>
Please always CC <a href=3D"mailto:tsv-art@ietf.org" target=3D"_blank">tsv-=
art@ietf.org</a> if you reply to or forward this<br>
review.<br>
<br>
This draft specifies local pseudowire (PW) repair mechanisms to<br>
quickly react to PW egress failures by rerouting traffic around the<br>
failure until slower-to-react repair mechanisms at larger scope are<br>
able to effect longer term repairs, e.g., via network topology<br>
changes.<br>
<br>
-- TSV-ART review comments:<br>
<br>
I found a couple of minor transport-related issues, both of which<br>
should be resolvable with modest amounts of additional explanation:<br>
<br>
* ECMP: The ECMP discussion in Section 4.1 on Applicability takes a<br>
conservative approach to avoiding packet reordering by recommending<br>
(SHOULD) that the entire ECMP set be rerouted as part of local repair.<br>
=C2=A0It&#39;s not clear what sort of ECMP is involved, as that acronym is =
used<br>
without a reference (or even expansion), so I&#39;d suggest citing a<br>
reference.=C2=A0 =C2=A0If the ECMP used is flow-aware so that reordering ac=
ross<br>
ECMP branches within an ECMP set does not cause reordering within any<br>
of the flows involved, then it ought to be safe from a reordering<br>
perspective to reroute an ECMP branch or set of branches that are less<br>
than the full ECMP set, although such partial rerouting could cause<br>
potentially undesirable forwarding latency differences within the ECMP<br>
set.=C2=A0 This ought to be discussed, as situations in which rerouting the=
<br>
entire ECMP bundle is overly conservative seem likely to arise in<br>
practice.<br>
<br>
* Traffic Engineering: Considering the intended speed of local repair,<br>
&quot;order of tens of milliseconds&quot; in the abstract, the bandwidth us=
ed by<br>
the repair paths has to be provisioned in advance of any failure that<br>
causes repair path usage - traffic engineering is a likely means of<br>
provisioning that bandwidth.=C2=A0 I see &quot;TE domain,&quot; &quot;TE me=
tric&quot; and &quot;TE<br>
path,&quot; which I assume refer to Traffic Engineering, but that TE<br>
acronym is not expanded, and I did not find text requiring traffic<br>
engineering and/or advance (bandwidth) provisioning of repair paths.<br>
I assume that this advance bandwidth provisioning of repair paths is<br>
intended as part of local repair, as not doing that invites immediate<br>
repair path failure due to lack of forwarding resources, which is<br>
definitely not desired.=C2=A0 A sentence or two ought to be added to point<=
br>
this bandwidth provisioning requirement out, possibly in Section 4.1<br>
(Applicability).=C2=A0 Adding that text would also reinforce the conclusion=
<br>
in the Security Considerations section that local repair reroutes are<br>
not a security threat, as the new text would add the rationale that<br>
local repair reroutes are anticipated and planned for by the network<br>
operator&#39;s traffic engineering.<br>
<br>
--=C2=A0 Other comments:<br>
<br>
* Having found two acronyms that were not expanded, I&#39;d suggest a<br>
general look for such acronyms.=C2=A0 =C2=A0OTOH, this is an area of networ=
k<br>
technology where many acronyms are in common use, and hence expansion<br>
of every acronym on first use may be excessive - among the ways of<br>
avoiding this could be citation of a reference at the start of Section<br>
3 where commonly used PW terms and acronyms are defined.<br>
<br>
<br>
</blockquote></div><br></div></div>

--94eb2c091a628e1c5d0542fcdb1d--


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Reviewer: Dale Worley
Review result: Ready with Nits

I am the assigned Gen-ART reviewer for this draft.  The General Area
Review Team (Gen-ART) reviews all IETF documents being processed
by the IESG for the IETF Chair.  Please treat these comments just
like any other last call comments.

For more information, please see the FAQ at
<http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>.

Document: draft-ietf-pals-endpoint-fast-protection-04
Reviewer: Dale R. Worley
Review Date: 2016-12-06
IETF LC End Date: 2016-12-06
IESG Telechat date: (not set)

Before reviewing this document, I knew nothing about pseudowire
routing, so my review does not fully assess the technical aspects of
the document.  I suspect that almost all of these items are editorial.
I hope that they are simply places where the description can be made
clearer to the naive reader by making it more exact.  Some of them may
be places where I don't fully understand the technology.  It's
possible that some of them are technical issues.

Summary:

This draft is basically ready for publication, but has nits that
should be fixed before publication.

These items seem to have technical content:

In section 4.2 and 4.3, it is not clear to me whether all of the PWs
being carried by a particular tunnel must have the same protector.
Section 4.2 says that it is so, but section 4.3 suggests that the PWs
can be divided into subsets which have different protectors, without
mentioning any correspondence between the subsets and the
tunnel-groups of PWs.

What is the mechanics of context identifiers in the context of
protecting egress ACs?  It seems like this should all be analogous to
the described cases (protecting PEs), but as this is a specification,
how the analogy works should be made explicit.

In section 6.4, does there need to be a specification for the
"Reserved" fields of the Protection FEC Element TLV?  Usually, there
is a specification "must be sent with zeros/must be ignored on
receipt".  (Or is there a global understanding of this in LDP?)

In section 6.4, there is a definition of "PW Information".  Are there
previous definitions of "PW information" in PW/LDP/MPLS usage?  It
looks a lot like what's defined in RFC 4447 sections 5.2 and 5.3.  If
they are semantically the same, the same format should be used and
simply referred to here.  If the format is different because they
aren't semantically the same ... perhaps there should be a note
explaining how/why.

Nits/editorial comments:

There are quite a number of places where "a" or "the" seems to be
omitted before nouns.  I'll let the RFC Editor identify/correct those.

There is a general issue regarding what aspects of local repair are
configured by some external means (e.g., the protectors that PLRs use,
the context identifiers) and what aspects are established
automagically by the defined mechanisms (the bypass tunnels).  The
document would have been clearer to me if these were separated
explicitly, but I suspect that it is common usage in routing
specifications for the reader to sort it out.

Abstract

IMO it would help if the Abstract mentioned that only IP/MPLS
transport tunnels are protected.  I say this because the only part of
this technology that I'd previously heard of was MPLS; such a
specification in the abstract would tell a large body of potential
readers that the document is *not* relevant to their situation.

1.  Introduction

   The mechanism is applicable to LDP signaled PWs.  It is relevant to
   networks with redundant PWs and multi-homed CEs.  It is designed on
   the basis of MPLS upstream label assignment and context-specific
   label switching [RFC5331].

It might be more informative to say "Fast failure protection for
pseudowire endpoints" rather than "The mechanism".

Which of the factors listed are prerequisites for the use of this
mechanism and which are factors which this mechanism additionally
supports?

Whichever of these are prerequisites for the solution should be
mentioned as such in the Abstract, including particularly that the PW
must be carried by IP/MPLS transport tunnels (as described in section
4.1 paragraph 2).

   Fast protection refers to its ability to
   restore traffic in the order of tens of milliseconds.  Compared
with
   global repair and control plane repair, this mechanism can provide
   faster service restoration.

What is the time scale of "global repair and control plane repair"?
Given that you give the time scale of "fast protection", it would be
informative to have comparable values for other repair techniques.

   However, it is intended to complement
   those mechanisms, rather than replacing them.

It might be useful to explain why global/control plane repair is still
needed.  (Then again, that might be obvious to anyone in the field.)

3.1.  Single-Segment PW

   For either mode, when considering the traffic flowing in a given
   direction over an active path, this document views the ACs, PEs and
   PWs to serve primary or backup roles.  In particular, the ACs, PEs
   and PW along this active path are primary, while those along the
   other path are backup.  Note that in the active-active mode, the
   backup path is an active path by itself, carrying its own share of
   traffic while protecting the other active path.

The wording here doesn't seem to be quite right.  I think you need to
phrase it more like this:

   For either mode, when considering the traffic flowing in a given
   direction over an active path, this document views the ACs, PEs and
   PWs to serve primary or backup roles or both.  In particular, given
   an active path, the ACs, PEs
   and PW along that active path have primary roles, while those along
the
   other path have backup roles.  Note that in the active-active mode,
   each AC, PE, and PW has a primary role (due to being on an active
   path) and also a backup role protecting the other path (which is
   also active).

--

   For clarity, primary egress AC, primary egress PE, backup egress
AC,
   and backup egress PE may simply be referred to as primary AC,
primary
   PE, backup AC, and backup PE, respectively, when the context of a
   discussion is egress endpoint.

This is correct, but it seems to overlook the use of "primary PE" to
mean "the PE that is being protected (when we are considering a
particular PLR and protector)".  That usage is common in the rest of
the document, but difficult for the naive reader to abstract from the
above text.

4.1.  Applicability

   In a network where
   transport tunnels may provide ECMP to primary PEs, care should be
   taken to prevent misordered packet delivery during local repair.

Should "ECMP" get a reference?  Or is it so common that any reader of
this document can be assumed to know already?

   In a network where
   transport tunnels may provide ECMP to primary PEs, care should be
   taken to prevent misordered packet delivery during local repair.

Perhaps this should be qualified with "if the PW or some flows
within the PW are sensitive to packet misordering", as is mentioned
later in the paragraph.

Naively, it seems that with ECMP it is impossible to prevent packet
reordering.  (E.g., it's hard to imagine using ECMP with ATM circuits
unless the destination performed SAR separately for each path.)
However, the scenario developed in the paragraph could cause a
dramatic increase in the "distance" that packets are reordered, and
that increase could be a problem.  Perhaps the text could emphasize
that the problem isn't so much the absolute presence of reordering but
its magnitude.

4.2.  Local Repair and Protector

I find this title peculiarly hard to parse.  I think the problem is
the ambiguity whether "local" modifies "protector" or not, as well as
the fact that "local repair" is a concept whereas "protector" is a
singular device.  Perhaps "Local Repair and Protectors" ("protectors"
is a class of devices, with similar abstractness as "local repair") or
"Local Repair, Bypass Tunnels, and Protectors" (since bypass tunnels
seem to be a similarly critical part of the solution).

   In anticipation of the failure, the PLR MUST
   also pre-establish a bypass tunnel to a "protector", and
pre-install
   a bypass route in the data plane.

It might be clearer to say "a bypass route for the bypass tunnel in
the data plane".

It would be useful to mention here that the protector is either a
backup PE which, in a sense, functions as an alternative terminus for
the PW segment, or a router which will forward traffic to such a
backup PE.

This raises the point that, in a way, the bypass tunnel is an
alternative continuation of the protected transport tunnel.  E.g., it
has as the destination endpoint the same virtual interface address
(the context identifier).  Or does the PLR, when repairing, act as a
proper downstream PE for the primary PW segment, and a proper upstream
PE for the PW segment in the bypass tunnel?  (I'm likely not using the
terminology correctly here, but I suspect that the terminology is not
used in a strictly correct manner in section 4.2.)

   Upon
   detecting the failure, the PLR invokes the bypass route in the data
   plane, and reroutes PW traffic to the protector through the bypass
   tunnel.

Does "invokes the bypass route" have a clear meaning, i.e., does this
use of "invoke" have a proper definition?  I think you can elide that
phrase and just say "the PLR reroutes PW traffic to the protector
...", with better clarity.

   In this document, the PLR
   simply computes and establishes a node protection bypass tunnel in
   the same fashion as the normal IP/MPLS node protection, except that
   with the notion of context identifier, the bypass tunnel will be
   established from the PLR to the protector (Section 4.6).

Is there a reference for "the normal IP/MPLS node protection"?
Without the context identifier, what would happen which contrasts to
"from the PLR to the protector"?

   On the other
   hand, this imposes a requirement on the protector that it MUST be
   able to forward the packets based on a PW label that is assigned by
   the primary PE, and ensure that the traffic MUST eventually reach
the
   target CE.

More strictly, the protector must forward the packets *along the
backup path*.  Of course, that's implied by the rest of the document,
but it might be worth including that fact in this statement.  It also
implies that all of the PEs along the backup path must be able to
forward the packets based on the PW label of the primary path.  That's
also implied, but I don't think it's stated anywhere.

4.3.  Context Identifier

   Likewise, the PWs terminated on a primary PE may be protected by
   multiple protectors, each for a subset of the PWs.

I think this is actually "PW segments" rather than "PWs" (since a PW
only terminates at the egress PE).  There seems to be a general issue
in the document of using "PW" in places where the strictly correct
term
is "PW segment".

But compare with section 4.2, "This requires that the protector given
by the bypass tunnel MUST be intended for all the PWs carried by the
[primary] transport tunnel."  That means that all PWs in one tunnel
must be within one of these subsets of PWs.  Is that really correct?

It seems to me that the context identifier is used as the address of
the virtual interface that is downstream end of the protected tunnel.
If so, it would have helped me make a mental model of the process by
stating that here in section 4.3 -- 4.3 states that a context
identifier is an address, but does not specify what it is the address
of.

What is the mechanics of context identifiers in the context of
protecting egress ACs?  Since there is a bypass tunnel, there must be
an address of the virtual interface within the protector that is the
terminus of the bypass tunnel.  It seems like this address should be
the context identifier used by the PLR, but in this situation there is
no downstream "primary PE" from which to make a {primary PE,
protector} pair.  I think that what works is to use the destination CE
in place of the primary PE.  That's straightforward, since the pairs
are never directly represented in the protocol, so most of the
mechanics should be unchanged.  In this situation, the PLR can't learn
the context identifier from the primary PE, but I suppose it can
invent/be configured with the context identifier itself, since it
doesn't need to establish a tunnel to the primary PE.  It seems like
this should all be analogous to the described cases, but as this is a
specification, how the analogy works should be made explicit.

4.3.1.  Semantics

      A distinct context identifier MUST be assigned to
      the primary PE and each protector.

This sentence is not correct as written since it states that context
identifiers are assigned to primary PEs and also are assigned to
protectors.  I think you meant to say

      A distinct context identifier MUST be assigned to
      each pair of primary PE and protector that it uses.

or 

      A distinct context identifier MUST be assigned to
      each {primary PE, protector} pair.

4.3.2.  FEC

   In an MPLS network, a context identifier represents a FEC
(Forwarding
   Equivalence Class) for transport tunnels and bypass tunnels
destined
   for it.

This doesn't seem to match the definition of "context identifier"
given previously, as a single context identifier can be used by
several PW segments ending at a PE, which PWs carry packets of
different FECs.  Is this perhaps "context label"?  Or are there
multiple meanings of "context identifier" which should be explicitly
disambiguated?  Or am I misreading this?

4.5.  Transport Tunnel

   In egress PE node protection and S-PE node protection,
   when a node failure is detected on any ECMP branch, the penultimate
   hop router SHOULD act as a PLR to reroute all the traffic of the
ECMP
   set to the protector.

I think "node failure" should be "link failure" here -- if there is
*node* failure (of the PE), then all of the ECMP paths will not work,
and the PLR would have to reroute all the traffic anyway.

4.6.  Bypass Tunnel

   A bypass tunnel SHOULD NOT need to be further protected against a
   transit link failure, transit node failure, or egress node failure.

I think this is an incorrect use of "SHOULD NOT", as it is not a
qualifier of a requirement on a device.  I think that you mean

   A bypass tunnel SHOULD NOT be protected against a
   transit link failure, transit node failure, or egress node failure.

But you might want to explain it with

   There is little or no benefit from protecting a bypass tunnel, so
   a bypass tunnel SHOULD NOT ...

4.7.  Examples of Forwarding State

   In the forwarding plane, it is indicated by
   the bypass tunnel(s) destined for the context identifier.

What is "it"?  I think it refers to "each label space", but in that
case I think "they" would be the preferred usage.  Better, replace
"it" with a noun phrase.

5.  Revertive Behavior

      Possible triggers of
      global repair include PW status notification, VCCV, BFD, end-to-
      end OAM between CEs, etc.

I see that "VCCV" is the topic of RFC 5085, but it is not the name of
a page in Wikipedia, which suggests that giving a reference for it
would be useful.

   Particularly in the
   case of egress PE and S-PE node failures, if the ingress PE or the
   protector loses communication with the (S-)PE for an extensive
period
   of time, LDP session may go down.

"the (S-)PE" isn't unique in this context, as there is an ingress PE
in the discourse.  I think you mean "the primary (S-)PE" (i.e., the
protected PE).

6.  LDP Extensions

   To facilitate the procedures,

Usually "facilitate" only applies to making easier something that
could be done already.  In this case, the new TLV is necessary to
enable these procedures, so I suggest s/facilitate/support/.

   The procedures in this section are only applicable, if the
protector
   advertises the Egress Protection Capability TLV, the primary PE
   supports the advertisement of the Protection FEC Element TLV, and
in
   the centralized protector model, the backup PE also supports the
   advertisement of the Protection FEC Element TLV.

My understanding is that "the procedures in this section" means
"establishing endpoint fast failure protection via LDP".  That seems
to be sufficiently important that it is probably worth expanding this
sentence into a bullet list:

   The procedures in this section are only applicable if:

       o the protector advertises the Egress Protection Capability
         TLV,

       o the primary PE supports the advertisement of the Protection
         FEC Element TLV, and

       o in the centralized protector model, the backup PE also
         supports the advertisement of the Protection FEC Element TLV.

Subtly, this seems to be the list of preconditions under which the PLR
can establish the needed tunnels and perform the local repair -- this
list does not list that the PLR must implement the needed behaviors,
which is obviously a precondition of local repair.  Or perhaps it is a
list of LDP capabilities that are required to set up local repair via
LDP.  In either case, it suggests the first clause could be revised
to change "the procedures ..." with a phrase that is more specific as
to what, precisely, is enabled by the conjunction of these three
items.

6.1.  Egress Protection Capability TLV

   The TLV Code Point is TBD.  It needs to be assigned by IANA.

It seems like this should be flagged with a note so the RFC Editor can
put in the assigned value.

   The "Capability Data" is encoded with the context identifier of the
   {primary PE, protector}.

This should be something like:

   The "Capability Data" is encoded with the context identifiers for
   the {primary PE, protector} pairs for which the advertiser is the
   protector.

6.4.  Protection FEC Element TLV

Does there need to be a specification for the "Reserved" fields?
Usually, there is a specification "must be sent with zeros/must be
ignored on receipt".  (Or is there a global specification of this in
LDP?)

     ~                         PW Information                        ~

Are there previous definitions of "PW information" in PW/LDP/MPLS
usage?  It looks a lot like what's defined in RFC 4447 sections 5.2
and 5.3.  If they are semantically the same, the same format should be
used and simply referred to here.  If they aren't semantically the
same ... perhaps there should be a note explaining why.

7.  IANA Considerations

The assignment for the Egress Protection Capability TLV should be
described more definitively.  My impression is that it should be
assigned out of the "TLV Type Name Space" in the LDP parameters page,
but that doesn't seem to be stated explicitly.  Also, there seem to be
three blocks of values (0x0001-0x07FF, 0x0800-0x08FF, 0x0900-0x3DFF)
that are all marked as "IETF consensus", but which presumably differ
in some manner.  Which block should the value be in?

Perhaps for clarity, an appropriate skeleton protocol assignment table
row should be shown.

   Value  Hex   Name                    Label Advertisement Discipline
   -------------------------------------------------------------------
   131    0x83  Protection FEC Element  DU

Section 6.2 calls the new TLV in the Label Mapping message "a
Protection FEC Element TLV", but section 7 calls it an "LDP Protection
FEC Type Name Space value".  The latter phrase consists of 7
successive nouns and is (IMO) unparsable by a reader who doesn't
already know what it means.  I suggest changing it to "the Protection
FEC Element value in the LDP FEC Type Name Space" (which aligns with
the titles used in the IANA protocol assignment web page).

It appears that the values in the FEC Type Name Space are 8 bits but
one place in section 7 gives the value as "0x083", which should
presumably be changed to "0x83".

8.  Security Considerations

   In all scenarios, the role of
   protector is entirely managed by network operator, and backup PEs
can
   be used anyway to host PWs and LDP sessions.

Perhaps "anyway" could be clarified as:

   ... and, regardless of local repair, backup PEs can
   be used to host PWs and LDP sessions. 

--

   In general, [RFC5920] describes the security framework for MPLS
   networks.  [RFC3209] describes the security considerations for RSVP
   LSPs.  [RFC5036] describes the security considerations for the base
   LDP specification.  [RFC5561] describes the security considerations
   which apply when using the LDP capability mechanism.  All these
   security framework and considerations apply to this document as
well.

Is there a reference for security considerations for "IP tunnels" (as
mentioned in section 4.3.1 and 4.6)?

Dale



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Dale,

Thanks for your review!

Cheers,
Andy

On Tue, Dec 6, 2016 at 11:27 AM, IETF Secretariat <
ietf-secretariat-reply@ietf.org> wrote:

> Reviewer: Dale Worley
> Review result: Ready with Nits
>
> I am the assigned Gen-ART reviewer for this draft.  The General Area
> Review Team (Gen-ART) reviews all IETF documents being processed
> by the IESG for the IETF Chair.  Please treat these comments just
> like any other last call comments.
>
> For more information, please see the FAQ at
> <http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>.
>
> Document: draft-ietf-pals-endpoint-fast-protection-04
> Reviewer: Dale R. Worley
> Review Date: 2016-12-06
> IETF LC End Date: 2016-12-06
> IESG Telechat date: (not set)
>
> Before reviewing this document, I knew nothing about pseudowire
> routing, so my review does not fully assess the technical aspects of
> the document.  I suspect that almost all of these items are editorial.
> I hope that they are simply places where the description can be made
> clearer to the naive reader by making it more exact.  Some of them may
> be places where I don't fully understand the technology.  It's
> possible that some of them are technical issues.
>
> Summary:
>
> This draft is basically ready for publication, but has nits that
> should be fixed before publication.
>
> These items seem to have technical content:
>
> In section 4.2 and 4.3, it is not clear to me whether all of the PWs
> being carried by a particular tunnel must have the same protector.
> Section 4.2 says that it is so, but section 4.3 suggests that the PWs
> can be divided into subsets which have different protectors, without
> mentioning any correspondence between the subsets and the
> tunnel-groups of PWs.
>
> What is the mechanics of context identifiers in the context of
> protecting egress ACs?  It seems like this should all be analogous to
> the described cases (protecting PEs), but as this is a specification,
> how the analogy works should be made explicit.
>
> In section 6.4, does there need to be a specification for the
> "Reserved" fields of the Protection FEC Element TLV?  Usually, there
> is a specification "must be sent with zeros/must be ignored on
> receipt".  (Or is there a global understanding of this in LDP?)
>
> In section 6.4, there is a definition of "PW Information".  Are there
> previous definitions of "PW information" in PW/LDP/MPLS usage?  It
> looks a lot like what's defined in RFC 4447 sections 5.2 and 5.3.  If
> they are semantically the same, the same format should be used and
> simply referred to here.  If the format is different because they
> aren't semantically the same ... perhaps there should be a note
> explaining how/why.
>
> Nits/editorial comments:
>
> There are quite a number of places where "a" or "the" seems to be
> omitted before nouns.  I'll let the RFC Editor identify/correct those.
>
> There is a general issue regarding what aspects of local repair are
> configured by some external means (e.g., the protectors that PLRs use,
> the context identifiers) and what aspects are established
> automagically by the defined mechanisms (the bypass tunnels).  The
> document would have been clearer to me if these were separated
> explicitly, but I suspect that it is common usage in routing
> specifications for the reader to sort it out.
>
> Abstract
>
> IMO it would help if the Abstract mentioned that only IP/MPLS
> transport tunnels are protected.  I say this because the only part of
> this technology that I'd previously heard of was MPLS; such a
> specification in the abstract would tell a large body of potential
> readers that the document is *not* relevant to their situation.
>
> 1.  Introduction
>
>    The mechanism is applicable to LDP signaled PWs.  It is relevant to
>    networks with redundant PWs and multi-homed CEs.  It is designed on
>    the basis of MPLS upstream label assignment and context-specific
>    label switching [RFC5331].
>
> It might be more informative to say "Fast failure protection for
> pseudowire endpoints" rather than "The mechanism".
>
> Which of the factors listed are prerequisites for the use of this
> mechanism and which are factors which this mechanism additionally
> supports?
>
> Whichever of these are prerequisites for the solution should be
> mentioned as such in the Abstract, including particularly that the PW
> must be carried by IP/MPLS transport tunnels (as described in section
> 4.1 paragraph 2).
>
>    Fast protection refers to its ability to
>    restore traffic in the order of tens of milliseconds.  Compared
> with
>    global repair and control plane repair, this mechanism can provide
>    faster service restoration.
>
> What is the time scale of "global repair and control plane repair"?
> Given that you give the time scale of "fast protection", it would be
> informative to have comparable values for other repair techniques.
>
>    However, it is intended to complement
>    those mechanisms, rather than replacing them.
>
> It might be useful to explain why global/control plane repair is still
> needed.  (Then again, that might be obvious to anyone in the field.)
>
> 3.1.  Single-Segment PW
>
>    For either mode, when considering the traffic flowing in a given
>    direction over an active path, this document views the ACs, PEs and
>    PWs to serve primary or backup roles.  In particular, the ACs, PEs
>    and PW along this active path are primary, while those along the
>    other path are backup.  Note that in the active-active mode, the
>    backup path is an active path by itself, carrying its own share of
>    traffic while protecting the other active path.
>
> The wording here doesn't seem to be quite right.  I think you need to
> phrase it more like this:
>
>    For either mode, when considering the traffic flowing in a given
>    direction over an active path, this document views the ACs, PEs and
>    PWs to serve primary or backup roles or both.  In particular, given
>    an active path, the ACs, PEs
>    and PW along that active path have primary roles, while those along
> the
>    other path have backup roles.  Note that in the active-active mode,
>    each AC, PE, and PW has a primary role (due to being on an active
>    path) and also a backup role protecting the other path (which is
>    also active).
>
> --
>
>    For clarity, primary egress AC, primary egress PE, backup egress
> AC,
>    and backup egress PE may simply be referred to as primary AC,
> primary
>    PE, backup AC, and backup PE, respectively, when the context of a
>    discussion is egress endpoint.
>
> This is correct, but it seems to overlook the use of "primary PE" to
> mean "the PE that is being protected (when we are considering a
> particular PLR and protector)".  That usage is common in the rest of
> the document, but difficult for the naive reader to abstract from the
> above text.
>
> 4.1.  Applicability
>
>    In a network where
>    transport tunnels may provide ECMP to primary PEs, care should be
>    taken to prevent misordered packet delivery during local repair.
>
> Should "ECMP" get a reference?  Or is it so common that any reader of
> this document can be assumed to know already?
>
>    In a network where
>    transport tunnels may provide ECMP to primary PEs, care should be
>    taken to prevent misordered packet delivery during local repair.
>
> Perhaps this should be qualified with "if the PW or some flows
> within the PW are sensitive to packet misordering", as is mentioned
> later in the paragraph.
>
> Naively, it seems that with ECMP it is impossible to prevent packet
> reordering.  (E.g., it's hard to imagine using ECMP with ATM circuits
> unless the destination performed SAR separately for each path.)
> However, the scenario developed in the paragraph could cause a
> dramatic increase in the "distance" that packets are reordered, and
> that increase could be a problem.  Perhaps the text could emphasize
> that the problem isn't so much the absolute presence of reordering but
> its magnitude.
>
> 4.2.  Local Repair and Protector
>
> I find this title peculiarly hard to parse.  I think the problem is
> the ambiguity whether "local" modifies "protector" or not, as well as
> the fact that "local repair" is a concept whereas "protector" is a
> singular device.  Perhaps "Local Repair and Protectors" ("protectors"
> is a class of devices, with similar abstractness as "local repair") or
> "Local Repair, Bypass Tunnels, and Protectors" (since bypass tunnels
> seem to be a similarly critical part of the solution).
>
>    In anticipation of the failure, the PLR MUST
>    also pre-establish a bypass tunnel to a "protector", and
> pre-install
>    a bypass route in the data plane.
>
> It might be clearer to say "a bypass route for the bypass tunnel in
> the data plane".
>
> It would be useful to mention here that the protector is either a
> backup PE which, in a sense, functions as an alternative terminus for
> the PW segment, or a router which will forward traffic to such a
> backup PE.
>
> This raises the point that, in a way, the bypass tunnel is an
> alternative continuation of the protected transport tunnel.  E.g., it
> has as the destination endpoint the same virtual interface address
> (the context identifier).  Or does the PLR, when repairing, act as a
> proper downstream PE for the primary PW segment, and a proper upstream
> PE for the PW segment in the bypass tunnel?  (I'm likely not using the
> terminology correctly here, but I suspect that the terminology is not
> used in a strictly correct manner in section 4.2.)
>
>    Upon
>    detecting the failure, the PLR invokes the bypass route in the data
>    plane, and reroutes PW traffic to the protector through the bypass
>    tunnel.
>
> Does "invokes the bypass route" have a clear meaning, i.e., does this
> use of "invoke" have a proper definition?  I think you can elide that
> phrase and just say "the PLR reroutes PW traffic to the protector
> ...", with better clarity.
>
>    In this document, the PLR
>    simply computes and establishes a node protection bypass tunnel in
>    the same fashion as the normal IP/MPLS node protection, except that
>    with the notion of context identifier, the bypass tunnel will be
>    established from the PLR to the protector (Section 4.6).
>
> Is there a reference for "the normal IP/MPLS node protection"?
> Without the context identifier, what would happen which contrasts to
> "from the PLR to the protector"?
>
>    On the other
>    hand, this imposes a requirement on the protector that it MUST be
>    able to forward the packets based on a PW label that is assigned by
>    the primary PE, and ensure that the traffic MUST eventually reach
> the
>    target CE.
>
> More strictly, the protector must forward the packets *along the
> backup path*.  Of course, that's implied by the rest of the document,
> but it might be worth including that fact in this statement.  It also
> implies that all of the PEs along the backup path must be able to
> forward the packets based on the PW label of the primary path.  That's
> also implied, but I don't think it's stated anywhere.
>
> 4.3.  Context Identifier
>
>    Likewise, the PWs terminated on a primary PE may be protected by
>    multiple protectors, each for a subset of the PWs.
>
> I think this is actually "PW segments" rather than "PWs" (since a PW
> only terminates at the egress PE).  There seems to be a general issue
> in the document of using "PW" in places where the strictly correct
> term
> is "PW segment".
>
> But compare with section 4.2, "This requires that the protector given
> by the bypass tunnel MUST be intended for all the PWs carried by the
> [primary] transport tunnel."  That means that all PWs in one tunnel
> must be within one of these subsets of PWs.  Is that really correct?
>
> It seems to me that the context identifier is used as the address of
> the virtual interface that is downstream end of the protected tunnel.
> If so, it would have helped me make a mental model of the process by
> stating that here in section 4.3 -- 4.3 states that a context
> identifier is an address, but does not specify what it is the address
> of.
>
> What is the mechanics of context identifiers in the context of
> protecting egress ACs?  Since there is a bypass tunnel, there must be
> an address of the virtual interface within the protector that is the
> terminus of the bypass tunnel.  It seems like this address should be
> the context identifier used by the PLR, but in this situation there is
> no downstream "primary PE" from which to make a {primary PE,
> protector} pair.  I think that what works is to use the destination CE
> in place of the primary PE.  That's straightforward, since the pairs
> are never directly represented in the protocol, so most of the
> mechanics should be unchanged.  In this situation, the PLR can't learn
> the context identifier from the primary PE, but I suppose it can
> invent/be configured with the context identifier itself, since it
> doesn't need to establish a tunnel to the primary PE.  It seems like
> this should all be analogous to the described cases, but as this is a
> specification, how the analogy works should be made explicit.
>
> 4.3.1.  Semantics
>
>       A distinct context identifier MUST be assigned to
>       the primary PE and each protector.
>
> This sentence is not correct as written since it states that context
> identifiers are assigned to primary PEs and also are assigned to
> protectors.  I think you meant to say
>
>       A distinct context identifier MUST be assigned to
>       each pair of primary PE and protector that it uses.
>
> or
>
>       A distinct context identifier MUST be assigned to
>       each {primary PE, protector} pair.
>
> 4.3.2.  FEC
>
>    In an MPLS network, a context identifier represents a FEC
> (Forwarding
>    Equivalence Class) for transport tunnels and bypass tunnels
> destined
>    for it.
>
> This doesn't seem to match the definition of "context identifier"
> given previously, as a single context identifier can be used by
> several PW segments ending at a PE, which PWs carry packets of
> different FECs.  Is this perhaps "context label"?  Or are there
> multiple meanings of "context identifier" which should be explicitly
> disambiguated?  Or am I misreading this?
>
> 4.5.  Transport Tunnel
>
>    In egress PE node protection and S-PE node protection,
>    when a node failure is detected on any ECMP branch, the penultimate
>    hop router SHOULD act as a PLR to reroute all the traffic of the
> ECMP
>    set to the protector.
>
> I think "node failure" should be "link failure" here -- if there is
> *node* failure (of the PE), then all of the ECMP paths will not work,
> and the PLR would have to reroute all the traffic anyway.
>
> 4.6.  Bypass Tunnel
>
>    A bypass tunnel SHOULD NOT need to be further protected against a
>    transit link failure, transit node failure, or egress node failure.
>
> I think this is an incorrect use of "SHOULD NOT", as it is not a
> qualifier of a requirement on a device.  I think that you mean
>
>    A bypass tunnel SHOULD NOT be protected against a
>    transit link failure, transit node failure, or egress node failure.
>
> But you might want to explain it with
>
>    There is little or no benefit from protecting a bypass tunnel, so
>    a bypass tunnel SHOULD NOT ...
>
> 4.7.  Examples of Forwarding State
>
>    In the forwarding plane, it is indicated by
>    the bypass tunnel(s) destined for the context identifier.
>
> What is "it"?  I think it refers to "each label space", but in that
> case I think "they" would be the preferred usage.  Better, replace
> "it" with a noun phrase.
>
> 5.  Revertive Behavior
>
>       Possible triggers of
>       global repair include PW status notification, VCCV, BFD, end-to-
>       end OAM between CEs, etc.
>
> I see that "VCCV" is the topic of RFC 5085, but it is not the name of
> a page in Wikipedia, which suggests that giving a reference for it
> would be useful.
>
>    Particularly in the
>    case of egress PE and S-PE node failures, if the ingress PE or the
>    protector loses communication with the (S-)PE for an extensive
> period
>    of time, LDP session may go down.
>
> "the (S-)PE" isn't unique in this context, as there is an ingress PE
> in the discourse.  I think you mean "the primary (S-)PE" (i.e., the
> protected PE).
>
> 6.  LDP Extensions
>
>    To facilitate the procedures,
>
> Usually "facilitate" only applies to making easier something that
> could be done already.  In this case, the new TLV is necessary to
> enable these procedures, so I suggest s/facilitate/support/.
>
>    The procedures in this section are only applicable, if the
> protector
>    advertises the Egress Protection Capability TLV, the primary PE
>    supports the advertisement of the Protection FEC Element TLV, and
> in
>    the centralized protector model, the backup PE also supports the
>    advertisement of the Protection FEC Element TLV.
>
> My understanding is that "the procedures in this section" means
> "establishing endpoint fast failure protection via LDP".  That seems
> to be sufficiently important that it is probably worth expanding this
> sentence into a bullet list:
>
>    The procedures in this section are only applicable if:
>
>        o the protector advertises the Egress Protection Capability
>          TLV,
>
>        o the primary PE supports the advertisement of the Protection
>          FEC Element TLV, and
>
>        o in the centralized protector model, the backup PE also
>          supports the advertisement of the Protection FEC Element TLV.
>
> Subtly, this seems to be the list of preconditions under which the PLR
> can establish the needed tunnels and perform the local repair -- this
> list does not list that the PLR must implement the needed behaviors,
> which is obviously a precondition of local repair.  Or perhaps it is a
> list of LDP capabilities that are required to set up local repair via
> LDP.  In either case, it suggests the first clause could be revised
> to change "the procedures ..." with a phrase that is more specific as
> to what, precisely, is enabled by the conjunction of these three
> items.
>
> 6.1.  Egress Protection Capability TLV
>
>    The TLV Code Point is TBD.  It needs to be assigned by IANA.
>
> It seems like this should be flagged with a note so the RFC Editor can
> put in the assigned value.
>
>    The "Capability Data" is encoded with the context identifier of the
>    {primary PE, protector}.
>
> This should be something like:
>
>    The "Capability Data" is encoded with the context identifiers for
>    the {primary PE, protector} pairs for which the advertiser is the
>    protector.
>
> 6.4.  Protection FEC Element TLV
>
> Does there need to be a specification for the "Reserved" fields?
> Usually, there is a specification "must be sent with zeros/must be
> ignored on receipt".  (Or is there a global specification of this in
> LDP?)
>
>      ~                         PW Information                        ~
>
> Are there previous definitions of "PW information" in PW/LDP/MPLS
> usage?  It looks a lot like what's defined in RFC 4447 sections 5.2
> and 5.3.  If they are semantically the same, the same format should be
> used and simply referred to here.  If they aren't semantically the
> same ... perhaps there should be a note explaining why.
>
> 7.  IANA Considerations
>
> The assignment for the Egress Protection Capability TLV should be
> described more definitively.  My impression is that it should be
> assigned out of the "TLV Type Name Space" in the LDP parameters page,
> but that doesn't seem to be stated explicitly.  Also, there seem to be
> three blocks of values (0x0001-0x07FF, 0x0800-0x08FF, 0x0900-0x3DFF)
> that are all marked as "IETF consensus", but which presumably differ
> in some manner.  Which block should the value be in?
>
> Perhaps for clarity, an appropriate skeleton protocol assignment table
> row should be shown.
>
>    Value  Hex   Name                    Label Advertisement Discipline
>    -------------------------------------------------------------------
>    131    0x83  Protection FEC Element  DU
>
> Section 6.2 calls the new TLV in the Label Mapping message "a
> Protection FEC Element TLV", but section 7 calls it an "LDP Protection
> FEC Type Name Space value".  The latter phrase consists of 7
> successive nouns and is (IMO) unparsable by a reader who doesn't
> already know what it means.  I suggest changing it to "the Protection
> FEC Element value in the LDP FEC Type Name Space" (which aligns with
> the titles used in the IANA protocol assignment web page).
>
> It appears that the values in the FEC Type Name Space are 8 bits but
> one place in section 7 gives the value as "0x083", which should
> presumably be changed to "0x83".
>
> 8.  Security Considerations
>
>    In all scenarios, the role of
>    protector is entirely managed by network operator, and backup PEs
> can
>    be used anyway to host PWs and LDP sessions.
>
> Perhaps "anyway" could be clarified as:
>
>    ... and, regardless of local repair, backup PEs can
>    be used to host PWs and LDP sessions.
>
> --
>
>    In general, [RFC5920] describes the security framework for MPLS
>    networks.  [RFC3209] describes the security considerations for RSVP
>    LSPs.  [RFC5036] describes the security considerations for the base
>    LDP specification.  [RFC5561] describes the security considerations
>    which apply when using the LDP capability mechanism.  All these
>    security framework and considerations apply to this document as
> well.
>
> Is there a reference for security considerations for "IP tunnels" (as
> mentioned in section 4.3.1 and 4.6)?
>
> Dale
>
>
>

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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Dale,<div><br></div><div>Thanks for your review!</div><div=
><br></div><div>Cheers,</div><div>Andy</div><div class=3D"gmail_extra"><br>=
<div class=3D"gmail_quote">On Tue, Dec 6, 2016 at 11:27 AM, IETF Secretaria=
t <span dir=3D"ltr">&lt;<a href=3D"mailto:ietf-secretariat-reply@ietf.org" =
target=3D"_blank">ietf-secretariat-reply@ietf.<wbr>org</a>&gt;</span> wrote=
:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex">Reviewer: Dale Worley<br>
Review result: Ready with Nits<br>
<br>
I am the assigned Gen-ART reviewer for this draft.=C2=A0 The General Area<b=
r>
Review Team (Gen-ART) reviews all IETF documents being processed<br>
by the IESG for the IETF Chair.=C2=A0 Please treat these comments just<br>
like any other last call comments.<br>
<br>
For more information, please see the FAQ at<br>
&lt;<a href=3D"http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq" rel=
=3D"noreferrer" target=3D"_blank">http://wiki.tools.ietf.org/ar<wbr>ea/gen/=
trac/wiki/GenArtfaq</a>&gt;.<br>
<br>
Document: draft-ietf-pals-endpoint-fast-<wbr>protection-04<br>
Reviewer: Dale R. Worley<br>
Review Date: 2016-12-06<br>
IETF LC End Date: 2016-12-06<br>
IESG Telechat date: (not set)<br>
<br>
Before reviewing this document, I knew nothing about pseudowire<br>
routing, so my review does not fully assess the technical aspects of<br>
the document.=C2=A0 I suspect that almost all of these items are editorial.=
<br>
I hope that they are simply places where the description can be made<br>
clearer to the naive reader by making it more exact.=C2=A0 Some of them may=
<br>
be places where I don&#39;t fully understand the technology.=C2=A0 It&#39;s=
<br>
possible that some of them are technical issues.<br>
<br>
Summary:<br>
<br>
This draft is basically ready for publication, but has nits that<br>
should be fixed before publication.<br>
<br>
These items seem to have technical content:<br>
<br>
In section 4.2 and 4.3, it is not clear to me whether all of the PWs<br>
being carried by a particular tunnel must have the same protector.<br>
Section 4.2 says that it is so, but section 4.3 suggests that the PWs<br>
can be divided into subsets which have different protectors, without<br>
mentioning any correspondence between the subsets and the<br>
tunnel-groups of PWs.<br>
<br>
What is the mechanics of context identifiers in the context of<br>
protecting egress ACs?=C2=A0 It seems like this should all be analogous to<=
br>
the described cases (protecting PEs), but as this is a specification,<br>
how the analogy works should be made explicit.<br>
<br>
In section 6.4, does there need to be a specification for the<br>
&quot;Reserved&quot; fields of the Protection FEC Element TLV?=C2=A0 Usuall=
y, there<br>
is a specification &quot;must be sent with zeros/must be ignored on<br>
receipt&quot;.=C2=A0 (Or is there a global understanding of this in LDP?)<b=
r>
<br>
In section 6.4, there is a definition of &quot;PW Information&quot;.=C2=A0 =
Are there<br>
previous definitions of &quot;PW information&quot; in PW/LDP/MPLS usage?=C2=
=A0 It<br>
looks a lot like what&#39;s defined in RFC 4447 sections 5.2 and 5.3.=C2=A0=
 If<br>
they are semantically the same, the same format should be used and<br>
simply referred to here.=C2=A0 If the format is different because they<br>
aren&#39;t semantically the same ... perhaps there should be a note<br>
explaining how/why.<br>
<br>
Nits/editorial comments:<br>
<br>
There are quite a number of places where &quot;a&quot; or &quot;the&quot; s=
eems to be<br>
omitted before nouns.=C2=A0 I&#39;ll let the RFC Editor identify/correct th=
ose.<br>
<br>
There is a general issue regarding what aspects of local repair are<br>
configured by some external means (e.g., the protectors that PLRs use,<br>
the context identifiers) and what aspects are established<br>
automagically by the defined mechanisms (the bypass tunnels).=C2=A0 The<br>
document would have been clearer to me if these were separated<br>
explicitly, but I suspect that it is common usage in routing<br>
specifications for the reader to sort it out.<br>
<br>
Abstract<br>
<br>
IMO it would help if the Abstract mentioned that only IP/MPLS<br>
transport tunnels are protected.=C2=A0 I say this because the only part of<=
br>
this technology that I&#39;d previously heard of was MPLS; such a<br>
specification in the abstract would tell a large body of potential<br>
readers that the document is *not* relevant to their situation.<br>
<br>
1.=C2=A0 Introduction<br>
<br>
=C2=A0 =C2=A0The mechanism is applicable to LDP signaled PWs.=C2=A0 It is r=
elevant to<br>
=C2=A0 =C2=A0networks with redundant PWs and multi-homed CEs.=C2=A0 It is d=
esigned on<br>
=C2=A0 =C2=A0the basis of MPLS upstream label assignment and context-specif=
ic<br>
=C2=A0 =C2=A0label switching [RFC5331].<br>
<br>
It might be more informative to say &quot;Fast failure protection for<br>
pseudowire endpoints&quot; rather than &quot;The mechanism&quot;.<br>
<br>
Which of the factors listed are prerequisites for the use of this<br>
mechanism and which are factors which this mechanism additionally<br>
supports?<br>
<br>
Whichever of these are prerequisites for the solution should be<br>
mentioned as such in the Abstract, including particularly that the PW<br>
must be carried by IP/MPLS transport tunnels (as described in section<br>
4.1 paragraph 2).<br>
<br>
=C2=A0 =C2=A0Fast protection refers to its ability to<br>
=C2=A0 =C2=A0restore traffic in the order of tens of milliseconds.=C2=A0 Co=
mpared<br>
with<br>
=C2=A0 =C2=A0global repair and control plane repair, this mechanism can pro=
vide<br>
=C2=A0 =C2=A0faster service restoration.<br>
<br>
What is the time scale of &quot;global repair and control plane repair&quot=
;?<br>
Given that you give the time scale of &quot;fast protection&quot;, it would=
 be<br>
informative to have comparable values for other repair techniques.<br>
<br>
=C2=A0 =C2=A0However, it is intended to complement<br>
=C2=A0 =C2=A0those mechanisms, rather than replacing them.<br>
<br>
It might be useful to explain why global/control plane repair is still<br>
needed.=C2=A0 (Then again, that might be obvious to anyone in the field.)<b=
r>
<br>
3.1.=C2=A0 Single-Segment PW<br>
<br>
=C2=A0 =C2=A0For either mode, when considering the traffic flowing in a giv=
en<br>
=C2=A0 =C2=A0direction over an active path, this document views the ACs, PE=
s and<br>
=C2=A0 =C2=A0PWs to serve primary or backup roles.=C2=A0 In particular, the=
 ACs, PEs<br>
=C2=A0 =C2=A0and PW along this active path are primary, while those along t=
he<br>
=C2=A0 =C2=A0other path are backup.=C2=A0 Note that in the active-active mo=
de, the<br>
=C2=A0 =C2=A0backup path is an active path by itself, carrying its own shar=
e of<br>
=C2=A0 =C2=A0traffic while protecting the other active path.<br>
<br>
The wording here doesn&#39;t seem to be quite right.=C2=A0 I think you need=
 to<br>
phrase it more like this:<br>
<br>
=C2=A0 =C2=A0For either mode, when considering the traffic flowing in a giv=
en<br>
=C2=A0 =C2=A0direction over an active path, this document views the ACs, PE=
s and<br>
=C2=A0 =C2=A0PWs to serve primary or backup roles or both.=C2=A0 In particu=
lar, given<br>
=C2=A0 =C2=A0an active path, the ACs, PEs<br>
=C2=A0 =C2=A0and PW along that active path have primary roles, while those =
along<br>
the<br>
=C2=A0 =C2=A0other path have backup roles.=C2=A0 Note that in the active-ac=
tive mode,<br>
=C2=A0 =C2=A0each AC, PE, and PW has a primary role (due to being on an act=
ive<br>
=C2=A0 =C2=A0path) and also a backup role protecting the other path (which =
is<br>
=C2=A0 =C2=A0also active).<br>
<br>
--<br>
<br>
=C2=A0 =C2=A0For clarity, primary egress AC, primary egress PE, backup egre=
ss<br>
AC,<br>
=C2=A0 =C2=A0and backup egress PE may simply be referred to as primary AC,<=
br>
primary<br>
=C2=A0 =C2=A0PE, backup AC, and backup PE, respectively, when the context o=
f a<br>
=C2=A0 =C2=A0discussion is egress endpoint.<br>
<br>
This is correct, but it seems to overlook the use of &quot;primary PE&quot;=
 to<br>
mean &quot;the PE that is being protected (when we are considering a<br>
particular PLR and protector)&quot;.=C2=A0 That usage is common in the rest=
 of<br>
the document, but difficult for the naive reader to abstract from the<br>
above text.<br>
<br>
4.1.=C2=A0 Applicability<br>
<br>
=C2=A0 =C2=A0In a network where<br>
=C2=A0 =C2=A0transport tunnels may provide ECMP to primary PEs, care should=
 be<br>
=C2=A0 =C2=A0taken to prevent misordered packet delivery during local repai=
r.<br>
<br>
Should &quot;ECMP&quot; get a reference?=C2=A0 Or is it so common that any =
reader of<br>
this document can be assumed to know already?<br>
<br>
=C2=A0 =C2=A0In a network where<br>
=C2=A0 =C2=A0transport tunnels may provide ECMP to primary PEs, care should=
 be<br>
=C2=A0 =C2=A0taken to prevent misordered packet delivery during local repai=
r.<br>
<br>
Perhaps this should be qualified with &quot;if the PW or some flows<br>
within the PW are sensitive to packet misordering&quot;, as is mentioned<br=
>
later in the paragraph.<br>
<br>
Naively, it seems that with ECMP it is impossible to prevent packet<br>
reordering.=C2=A0 (E.g., it&#39;s hard to imagine using ECMP with ATM circu=
its<br>
unless the destination performed SAR separately for each path.)<br>
However, the scenario developed in the paragraph could cause a<br>
dramatic increase in the &quot;distance&quot; that packets are reordered, a=
nd<br>
that increase could be a problem.=C2=A0 Perhaps the text could emphasize<br=
>
that the problem isn&#39;t so much the absolute presence of reordering but<=
br>
its magnitude.<br>
<br>
4.2.=C2=A0 Local Repair and Protector<br>
<br>
I find this title peculiarly hard to parse.=C2=A0 I think the problem is<br=
>
the ambiguity whether &quot;local&quot; modifies &quot;protector&quot; or n=
ot, as well as<br>
the fact that &quot;local repair&quot; is a concept whereas &quot;protector=
&quot; is a<br>
singular device.=C2=A0 Perhaps &quot;Local Repair and Protectors&quot; (&qu=
ot;protectors&quot;<br>
is a class of devices, with similar abstractness as &quot;local repair&quot=
;) or<br>
&quot;Local Repair, Bypass Tunnels, and Protectors&quot; (since bypass tunn=
els<br>
seem to be a similarly critical part of the solution).<br>
<br>
=C2=A0 =C2=A0In anticipation of the failure, the PLR MUST<br>
=C2=A0 =C2=A0also pre-establish a bypass tunnel to a &quot;protector&quot;,=
 and<br>
pre-install<br>
=C2=A0 =C2=A0a bypass route in the data plane.<br>
<br>
It might be clearer to say &quot;a bypass route for the bypass tunnel in<br=
>
the data plane&quot;.<br>
<br>
It would be useful to mention here that the protector is either a<br>
backup PE which, in a sense, functions as an alternative terminus for<br>
the PW segment, or a router which will forward traffic to such a<br>
backup PE.<br>
<br>
This raises the point that, in a way, the bypass tunnel is an<br>
alternative continuation of the protected transport tunnel.=C2=A0 E.g., it<=
br>
has as the destination endpoint the same virtual interface address<br>
(the context identifier).=C2=A0 Or does the PLR, when repairing, act as a<b=
r>
proper downstream PE for the primary PW segment, and a proper upstream<br>
PE for the PW segment in the bypass tunnel?=C2=A0 (I&#39;m likely not using=
 the<br>
terminology correctly here, but I suspect that the terminology is not<br>
used in a strictly correct manner in section 4.2.)<br>
<br>
=C2=A0 =C2=A0Upon<br>
=C2=A0 =C2=A0detecting the failure, the PLR invokes the bypass route in the=
 data<br>
=C2=A0 =C2=A0plane, and reroutes PW traffic to the protector through the by=
pass<br>
=C2=A0 =C2=A0tunnel.<br>
<br>
Does &quot;invokes the bypass route&quot; have a clear meaning, i.e., does =
this<br>
use of &quot;invoke&quot; have a proper definition?=C2=A0 I think you can e=
lide that<br>
phrase and just say &quot;the PLR reroutes PW traffic to the protector<br>
...&quot;, with better clarity.<br>
<br>
=C2=A0 =C2=A0In this document, the PLR<br>
=C2=A0 =C2=A0simply computes and establishes a node protection bypass tunne=
l in<br>
=C2=A0 =C2=A0the same fashion as the normal IP/MPLS node protection, except=
 that<br>
=C2=A0 =C2=A0with the notion of context identifier, the bypass tunnel will =
be<br>
=C2=A0 =C2=A0established from the PLR to the protector (Section 4.6).<br>
<br>
Is there a reference for &quot;the normal IP/MPLS node protection&quot;?<br=
>
Without the context identifier, what would happen which contrasts to<br>
&quot;from the PLR to the protector&quot;?<br>
<br>
=C2=A0 =C2=A0On the other<br>
=C2=A0 =C2=A0hand, this imposes a requirement on the protector that it MUST=
 be<br>
=C2=A0 =C2=A0able to forward the packets based on a PW label that is assign=
ed by<br>
=C2=A0 =C2=A0the primary PE, and ensure that the traffic MUST eventually re=
ach<br>
the<br>
=C2=A0 =C2=A0target CE.<br>
<br>
More strictly, the protector must forward the packets *along the<br>
backup path*.=C2=A0 Of course, that&#39;s implied by the rest of the docume=
nt,<br>
but it might be worth including that fact in this statement.=C2=A0 It also<=
br>
implies that all of the PEs along the backup path must be able to<br>
forward the packets based on the PW label of the primary path.=C2=A0 That&#=
39;s<br>
also implied, but I don&#39;t think it&#39;s stated anywhere.<br>
<br>
4.3.=C2=A0 Context Identifier<br>
<br>
=C2=A0 =C2=A0Likewise, the PWs terminated on a primary PE may be protected =
by<br>
=C2=A0 =C2=A0multiple protectors, each for a subset of the PWs.<br>
<br>
I think this is actually &quot;PW segments&quot; rather than &quot;PWs&quot=
; (since a PW<br>
only terminates at the egress PE).=C2=A0 There seems to be a general issue<=
br>
in the document of using &quot;PW&quot; in places where the strictly correc=
t<br>
term<br>
is &quot;PW segment&quot;.<br>
<br>
But compare with section 4.2, &quot;This requires that the protector given<=
br>
by the bypass tunnel MUST be intended for all the PWs carried by the<br>
[primary] transport tunnel.&quot;=C2=A0 That means that all PWs in one tunn=
el<br>
must be within one of these subsets of PWs.=C2=A0 Is that really correct?<b=
r>
<br>
It seems to me that the context identifier is used as the address of<br>
the virtual interface that is downstream end of the protected tunnel.<br>
If so, it would have helped me make a mental model of the process by<br>
stating that here in section 4.3 -- 4.3 states that a context<br>
identifier is an address, but does not specify what it is the address<br>
of.<br>
<br>
What is the mechanics of context identifiers in the context of<br>
protecting egress ACs?=C2=A0 Since there is a bypass tunnel, there must be<=
br>
an address of the virtual interface within the protector that is the<br>
terminus of the bypass tunnel.=C2=A0 It seems like this address should be<b=
r>
the context identifier used by the PLR, but in this situation there is<br>
no downstream &quot;primary PE&quot; from which to make a {primary PE,<br>
protector} pair.=C2=A0 I think that what works is to use the destination CE=
<br>
in place of the primary PE.=C2=A0 That&#39;s straightforward, since the pai=
rs<br>
are never directly represented in the protocol, so most of the<br>
mechanics should be unchanged.=C2=A0 In this situation, the PLR can&#39;t l=
earn<br>
the context identifier from the primary PE, but I suppose it can<br>
invent/be configured with the context identifier itself, since it<br>
doesn&#39;t need to establish a tunnel to the primary PE.=C2=A0 It seems li=
ke<br>
this should all be analogous to the described cases, but as this is a<br>
specification, how the analogy works should be made explicit.<br>
<br>
4.3.1.=C2=A0 Semantics<br>
<br>
=C2=A0 =C2=A0 =C2=A0 A distinct context identifier MUST be assigned to<br>
=C2=A0 =C2=A0 =C2=A0 the primary PE and each protector.<br>
<br>
This sentence is not correct as written since it states that context<br>
identifiers are assigned to primary PEs and also are assigned to<br>
protectors.=C2=A0 I think you meant to say<br>
<br>
=C2=A0 =C2=A0 =C2=A0 A distinct context identifier MUST be assigned to<br>
=C2=A0 =C2=A0 =C2=A0 each pair of primary PE and protector that it uses.<br=
>
<br>
or<br>
<br>
=C2=A0 =C2=A0 =C2=A0 A distinct context identifier MUST be assigned to<br>
=C2=A0 =C2=A0 =C2=A0 each {primary PE, protector} pair.<br>
<br>
4.3.2.=C2=A0 FEC<br>
<br>
=C2=A0 =C2=A0In an MPLS network, a context identifier represents a FEC<br>
(Forwarding<br>
=C2=A0 =C2=A0Equivalence Class) for transport tunnels and bypass tunnels<br=
>
destined<br>
=C2=A0 =C2=A0for it.<br>
<br>
This doesn&#39;t seem to match the definition of &quot;context identifier&q=
uot;<br>
given previously, as a single context identifier can be used by<br>
several PW segments ending at a PE, which PWs carry packets of<br>
different FECs.=C2=A0 Is this perhaps &quot;context label&quot;?=C2=A0 Or a=
re there<br>
multiple meanings of &quot;context identifier&quot; which should be explici=
tly<br>
disambiguated?=C2=A0 Or am I misreading this?<br>
<br>
4.5.=C2=A0 Transport Tunnel<br>
<br>
=C2=A0 =C2=A0In egress PE node protection and S-PE node protection,<br>
=C2=A0 =C2=A0when a node failure is detected on any ECMP branch, the penult=
imate<br>
=C2=A0 =C2=A0hop router SHOULD act as a PLR to reroute all the traffic of t=
he<br>
ECMP<br>
=C2=A0 =C2=A0set to the protector.<br>
<br>
I think &quot;node failure&quot; should be &quot;link failure&quot; here --=
 if there is<br>
*node* failure (of the PE), then all of the ECMP paths will not work,<br>
and the PLR would have to reroute all the traffic anyway.<br>
<br>
4.6.=C2=A0 Bypass Tunnel<br>
<br>
=C2=A0 =C2=A0A bypass tunnel SHOULD NOT need to be further protected agains=
t a<br>
=C2=A0 =C2=A0transit link failure, transit node failure, or egress node fai=
lure.<br>
<br>
I think this is an incorrect use of &quot;SHOULD NOT&quot;, as it is not a<=
br>
qualifier of a requirement on a device.=C2=A0 I think that you mean<br>
<br>
=C2=A0 =C2=A0A bypass tunnel SHOULD NOT be protected against a<br>
=C2=A0 =C2=A0transit link failure, transit node failure, or egress node fai=
lure.<br>
<br>
But you might want to explain it with<br>
<br>
=C2=A0 =C2=A0There is little or no benefit from protecting a bypass tunnel,=
 so<br>
=C2=A0 =C2=A0a bypass tunnel SHOULD NOT ...<br>
<br>
4.7.=C2=A0 Examples of Forwarding State<br>
<br>
=C2=A0 =C2=A0In the forwarding plane, it is indicated by<br>
=C2=A0 =C2=A0the bypass tunnel(s) destined for the context identifier.<br>
<br>
What is &quot;it&quot;?=C2=A0 I think it refers to &quot;each label space&q=
uot;, but in that<br>
case I think &quot;they&quot; would be the preferred usage.=C2=A0 Better, r=
eplace<br>
&quot;it&quot; with a noun phrase.<br>
<br>
5.=C2=A0 Revertive Behavior<br>
<br>
=C2=A0 =C2=A0 =C2=A0 Possible triggers of<br>
=C2=A0 =C2=A0 =C2=A0 global repair include PW status notification, VCCV, BF=
D, end-to-<br>
=C2=A0 =C2=A0 =C2=A0 end OAM between CEs, etc.<br>
<br>
I see that &quot;VCCV&quot; is the topic of RFC 5085, but it is not the nam=
e of<br>
a page in Wikipedia, which suggests that giving a reference for it<br>
would be useful.<br>
<br>
=C2=A0 =C2=A0Particularly in the<br>
=C2=A0 =C2=A0case of egress PE and S-PE node failures, if the ingress PE or=
 the<br>
=C2=A0 =C2=A0protector loses communication with the (S-)PE for an extensive=
<br>
period<br>
=C2=A0 =C2=A0of time, LDP session may go down.<br>
<br>
&quot;the (S-)PE&quot; isn&#39;t unique in this context, as there is an ing=
ress PE<br>
in the discourse.=C2=A0 I think you mean &quot;the primary (S-)PE&quot; (i.=
e., the<br>
protected PE).<br>
<br>
6.=C2=A0 LDP Extensions<br>
<br>
=C2=A0 =C2=A0To facilitate the procedures,<br>
<br>
Usually &quot;facilitate&quot; only applies to making easier something that=
<br>
could be done already.=C2=A0 In this case, the new TLV is necessary to<br>
enable these procedures, so I suggest s/facilitate/support/.<br>
<br>
=C2=A0 =C2=A0The procedures in this section are only applicable, if the<br>
protector<br>
=C2=A0 =C2=A0advertises the Egress Protection Capability TLV, the primary P=
E<br>
=C2=A0 =C2=A0supports the advertisement of the Protection FEC Element TLV, =
and<br>
in<br>
=C2=A0 =C2=A0the centralized protector model, the backup PE also supports t=
he<br>
=C2=A0 =C2=A0advertisement of the Protection FEC Element TLV.<br>
<br>
My understanding is that &quot;the procedures in this section&quot; means<b=
r>
&quot;establishing endpoint fast failure protection via LDP&quot;.=C2=A0 Th=
at seems<br>
to be sufficiently important that it is probably worth expanding this<br>
sentence into a bullet list:<br>
<br>
=C2=A0 =C2=A0The procedures in this section are only applicable if:<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0o the protector advertises the Egress Protection=
 Capability<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0TLV,<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0o the primary PE supports the advertisement of t=
he Protection<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0FEC Element TLV, and<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0o in the centralized protector model, the backup=
 PE also<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0supports the advertisement of the Protect=
ion FEC Element TLV.<br>
<br>
Subtly, this seems to be the list of preconditions under which the PLR<br>
can establish the needed tunnels and perform the local repair -- this<br>
list does not list that the PLR must implement the needed behaviors,<br>
which is obviously a precondition of local repair.=C2=A0 Or perhaps it is a=
<br>
list of LDP capabilities that are required to set up local repair via<br>
LDP.=C2=A0 In either case, it suggests the first clause could be revised<br=
>
to change &quot;the procedures ...&quot; with a phrase that is more specifi=
c as<br>
to what, precisely, is enabled by the conjunction of these three<br>
items.<br>
<br>
6.1.=C2=A0 Egress Protection Capability TLV<br>
<br>
=C2=A0 =C2=A0The TLV Code Point is TBD.=C2=A0 It needs to be assigned by IA=
NA.<br>
<br>
It seems like this should be flagged with a note so the RFC Editor can<br>
put in the assigned value.<br>
<br>
=C2=A0 =C2=A0The &quot;Capability Data&quot; is encoded with the context id=
entifier of the<br>
=C2=A0 =C2=A0{primary PE, protector}.<br>
<br>
This should be something like:<br>
<br>
=C2=A0 =C2=A0The &quot;Capability Data&quot; is encoded with the context id=
entifiers for<br>
=C2=A0 =C2=A0the {primary PE, protector} pairs for which the advertiser is =
the<br>
=C2=A0 =C2=A0protector.<br>
<br>
6.4.=C2=A0 Protection FEC Element TLV<br>
<br>
Does there need to be a specification for the &quot;Reserved&quot; fields?<=
br>
Usually, there is a specification &quot;must be sent with zeros/must be<br>
ignored on receipt&quot;.=C2=A0 (Or is there a global specification of this=
 in<br>
LDP?)<br>
<br>
=C2=A0 =C2=A0 =C2=A0~=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0PW Information=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ~<br>
<br>
Are there previous definitions of &quot;PW information&quot; in PW/LDP/MPLS=
<br>
usage?=C2=A0 It looks a lot like what&#39;s defined in RFC 4447 sections 5.=
2<br>
and 5.3.=C2=A0 If they are semantically the same, the same format should be=
<br>
used and simply referred to here.=C2=A0 If they aren&#39;t semantically the=
<br>
same ... perhaps there should be a note explaining why.<br>
<br>
7.=C2=A0 IANA Considerations<br>
<br>
The assignment for the Egress Protection Capability TLV should be<br>
described more definitively.=C2=A0 My impression is that it should be<br>
assigned out of the &quot;TLV Type Name Space&quot; in the LDP parameters p=
age,<br>
but that doesn&#39;t seem to be stated explicitly.=C2=A0 Also, there seem t=
o be<br>
three blocks of values (0x0001-0x07FF, 0x0800-0x08FF, 0x0900-0x3DFF)<br>
that are all marked as &quot;IETF consensus&quot;, but which presumably dif=
fer<br>
in some manner.=C2=A0 Which block should the value be in?<br>
<br>
Perhaps for clarity, an appropriate skeleton protocol assignment table<br>
row should be shown.<br>
<br>
=C2=A0 =C2=A0Value=C2=A0 Hex=C2=A0 =C2=A0Name=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Label Advertisement Discipline<br=
>
=C2=A0 =C2=A0-----------------------------<wbr>----------------------------=
--<wbr>--------<br>
=C2=A0 =C2=A0131=C2=A0 =C2=A0 0x83=C2=A0 Protection FEC Element=C2=A0 DU<br=
>
<br>
Section 6.2 calls the new TLV in the Label Mapping message &quot;a<br>
Protection FEC Element TLV&quot;, but section 7 calls it an &quot;LDP Prote=
ction<br>
FEC Type Name Space value&quot;.=C2=A0 The latter phrase consists of 7<br>
successive nouns and is (IMO) unparsable by a reader who doesn&#39;t<br>
already know what it means.=C2=A0 I suggest changing it to &quot;the Protec=
tion<br>
FEC Element value in the LDP FEC Type Name Space&quot; (which aligns with<b=
r>
the titles used in the IANA protocol assignment web page).<br>
<br>
It appears that the values in the FEC Type Name Space are 8 bits but<br>
one place in section 7 gives the value as &quot;0x083&quot;, which should<b=
r>
presumably be changed to &quot;0x83&quot;.<br>
<br>
8.=C2=A0 Security Considerations<br>
<br>
=C2=A0 =C2=A0In all scenarios, the role of<br>
=C2=A0 =C2=A0protector is entirely managed by network operator, and backup =
PEs<br>
can<br>
=C2=A0 =C2=A0be used anyway to host PWs and LDP sessions.<br>
<br>
Perhaps &quot;anyway&quot; could be clarified as:<br>
<br>
=C2=A0 =C2=A0... and, regardless of local repair, backup PEs can<br>
=C2=A0 =C2=A0be used to host PWs and LDP sessions.<br>
<br>
--<br>
<br>
=C2=A0 =C2=A0In general, [RFC5920] describes the security framework for MPL=
S<br>
=C2=A0 =C2=A0networks.=C2=A0 [RFC3209] describes the security consideration=
s for RSVP<br>
=C2=A0 =C2=A0LSPs.=C2=A0 [RFC5036] describes the security considerations fo=
r the base<br>
=C2=A0 =C2=A0LDP specification.=C2=A0 [RFC5561] describes the security cons=
iderations<br>
=C2=A0 =C2=A0which apply when using the LDP capability mechanism.=C2=A0 All=
 these<br>
=C2=A0 =C2=A0security framework and considerations apply to this document a=
s<br>
well.<br>
<br>
Is there a reference for security considerations for &quot;IP tunnels&quot;=
 (as<br>
mentioned in section 4.3.1 and 4.6)?<br>
<br>
Dale<br>
<br>
<br>
</blockquote></div><br></div></div>

--001a113e4ad25d0c770543018396--


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Thread-Topic: Hi folks!  I  would like to contribute STP YANG modeling, is it ok? Thanks a lot !
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----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------

Sections 6.4.1 and 6.4.2

The Ingress and Egress PE Addresses are encoded as 4 byte fields. How is
this expected to work with IPv6 addresses for the PEs?





From nobody Wed Dec 14 05:32:32 2016
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

A few smallish comments/questions:

1) This is no news but there are a lot of acronyms in this drafts which
makes it partly hard to read. Some of them are never spelled out, such as
PE, CE, RSVP... I would like to propose two changes to support the
reader: 1) Spell out all acronyms in the abstract and 2) add a glossary.
Further you could maybe also define some terminology at the beginning
such as 'protector'.

2) This sentence/use of acronym is confusing: 
"In Figure 1, the IP/MPLS network consists of PE and P routers."
NEW:
"In Figure 1, the IP/MPLS network consists of four PEs and two routers P1
and P2."

3) I don't fully understand this part in sec 4.1:
"Normally the router will attempt to
   forward PW packets in a load balance fashion over the ECMP set.  When
   the link fails, if the router reroutes only the portion of traffic
   originally traversing the link while letting the rest of traffic
   remain on the other ECMP branches, it will create a situation where
   the egress CE receives traffic from both the primary PE and the
   backup PE. "
If you have two ECMP branches, why don't you simply use the other one for
all traffic? Isn't this the kind of protection your are discussing? Or
are you assuming that this note somewhere on the PW does not apply this
backup strategy?

4) Do you have references for mechanisms described in section 5?

One high level comment:
I was wondering while reading the whole time if this should be
informational or standards track. Was there any discussion in the wg? Are
there implementations?



From nobody Wed Dec 14 09:38:26 2016
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Minor:

1) The details in Figure 11 on p. 22 don't look quite right.    There is
no forwarding state shown on PE4 to handle the incoming labels of 2000
(P3's outgoing label of bypass tunnel to PE4) or 3000 (P2's outgoing
label of bypass tunnel to PE4).    Either there should be additional
forwarding state on PE4 that says to pop 2000 (or 3000) and identify a
context label space - or PE4 should have allocated the context label 999
to the bypass tunnels from P3 and PE2.

I see the same issue in Figures 12, 13, and 14.   Is there  a detail or
explanation missing?



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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Yimin Shen <yshen@juniper.net>
Thread-Topic: [Pals] Suresh Krishnan's Discuss on draft-ietf-pals-endpoint-fast-protection-04: (with DISCUSS)
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Date: Wed, 14 Dec 2016 20:51:27 +0000
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Cc: "draft-ietf-pals-endpoint-fast-protection@ietf.org" <draft-ietf-pals-endpoint-fast-protection@ietf.org>, Suresh Krishnan <suresh.krishnan@ericsson.com>, "pals-chairs@ietf.org" <pals-chairs@ietf.org>, The IESG <iesg@ietf.org>, "pals@ietf.org" <pals@ietf.org>, Stewart Bryant <stewart.bryant@gmail.com>
Subject: Re: [Pals] Suresh Krishnan's Discuss on draft-ietf-pals-endpoint-fast-protection-04: (with DISCUSS)
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Stephen Farrell has entered the following ballot position for
draft-ietf-pals-endpoint-fast-protection-04: No Objection

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


- section 5: I'm not sure "revertive" is a useful term
here. Seems to me that it's a) admirably obscure, b) maybe
inaccurate, as we're not reverting to a previous state
here but rather changing paths, and maybe c) it's not
clear if we end up with a "fully functional" path after
"reverting." But maybe it's an accepted term of art in
routing - if so, some reference to where it's well
described might be nice.

- section 8, para 1: this assumes that "managed by network
operator" means "is secure." I think we have examples
where not all that happens within a network is under the
control of the owner of the network, so I question that
assumption. (I'm not now asking for a concrete change as
that'd be a major bit of work, but I am as willing as ever
to continue to call this out as it appears;-) If you could
remove text based on that assumption, that'd improve the
document I think.



From nobody Wed Dec 14 19:56:01 2016
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From: Suresh Krishnan <suresh.krishnan@ericsson.com>
To: Yimin Shen <yshen@juniper.net>, The IESG <iesg@ietf.org>
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Hi Yimin,=0A=
=0A=
On 12/14/2016 01:57 PM, Yimin Shen wrote:=0A=
> Hi Suresh,=0A=
>=0A=
> Thanks very much for your review and the question about section 6.4.1 and=
 6.4.2.=0A=
>=0A=
> This document does not define any new encoding. Instead it is using the d=
efinitions of RFC4447, as noted in 6.4 for intro to 6.4.1 and 6.4.2. Specif=
ically, the =93Protection FEC Element TLV=94 uses the encoding and semantic=
s of PWid FEC and Genercalize PWid FEC defined in RFC 4447. These FECs carr=
y IPv4 addresses, and there is currently no IPv6 encoding defined for these=
 FECs by IETF.=0A=
=0A=
I have a hard time understanding how this document does not define a new =
=0A=
encoding. The title of the section 6.4.1. is "Encoding Format for PWid" and=
 =0A=
the TLV type is 0x83 which is *not* defined in RFC4447. Can you please =0A=
clarify what you mean? I think the proposal by Carlos to resolve this seems=
 =0A=
to be reasonable to me.=0A=
=0A=
Thanks=0A=
Suresh=0A=
=0A=


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From: Yimin Shen <yshen@juniper.net>
To: Suresh Krishnan <suresh.krishnan@ericsson.com>, The IESG <iesg@ietf.org>,  "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
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Thanks for your in-depth review, Dale! Andy, I assume possible edits are =
on their way in a new version?

Jari


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Subject: Re: [Pals] [Gen-art] Review of draft-ietf-pals-endpoint-fast-protection-04
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Jari,

Yes, Deborah will do the approval as revised draft needed, and comments
from Suresh and others will then be addressed.

Cheers,
Andy


On Thu, Dec 15, 2016 at 5:19 AM, Jari Arkko <jari.arkko@piuha.net> wrote:

> Thanks for your in-depth review, Dale! Andy, I assume possible edits are
> on their way in a new version?
>
> Jari
>
>

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<div dir=3D"ltr">Jari,<div><br></div><div>Yes, Deborah will=C2=A0<span styl=
e=3D"color:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:14.66666=
6030883789px">do the approval as revised=C2=A0</span><span class=3D"il" sty=
le=3D"color:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:14.6666=
66030883789px">draft</span><span style=3D"color:rgb(31,73,125);font-family:=
Calibri,sans-serif;font-size:14.666666030883789px">=C2=A0needed, and commen=
ts from Suresh and others will then be addressed.</span></div><div><span st=
yle=3D"color:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:14.666=
666030883789px"><br></span></div><div><font color=3D"#1f497d" face=3D"Calib=
ri, sans-serif"><span style=3D"font-size:14.666666030883789px">Cheers,</spa=
n></font></div><div><font color=3D"#1f497d" face=3D"Calibri, sans-serif"><s=
pan style=3D"font-size:14.666666030883789px">Andy</span></font></div><div><=
font color=3D"#1f497d" face=3D"Calibri, sans-serif"><span style=3D"font-siz=
e:14.666666030883789px"><br></span></font></div></div><div class=3D"gmail_e=
xtra"><br><div class=3D"gmail_quote">On Thu, Dec 15, 2016 at 5:19 AM, Jari =
Arkko <span dir=3D"ltr">&lt;<a href=3D"mailto:jari.arkko@piuha.net" target=
=3D"_blank">jari.arkko@piuha.net</a>&gt;</span> wrote:<br><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">Thanks for your in-depth review, Dale! Andy, I assume possibl=
e edits are on their way in a new version?<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
Jari<br>
<br>
</font></span></blockquote></div><br></div>

--089e0122929667a99c0543b26902--


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Subject: [Pals] Benoit Claise's No Objection on draft-ietf-pals-endpoint-fast-protection-04: (with COMMENT)
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Benoit Claise has entered the following ballot position for
draft-ietf-pals-endpoint-fast-protection-04: No Objection

When responding, please keep the subject line intact and reply to all
email addresses included in the To and CC lines. (Feel free to cut this
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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-pals-endpoint-fast-protection/



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

Editorial nits (From Sue Hares, part of her OPS-DIR review)

1.       Page 10  - style makes difficult reading of sentence  (very
minor nit).

OLD /A PLR MUST Be able to detect a failure by using a rapid mechanism,
such as physical layer failure detection, Bidirectional failure detection
(BFD) [RFC5880], etc. /

NEW /A PLR MUST Be able to detect a failure by using a rapid mechanism,
such as physical layer failure detection, Bidirectional failure detection
(BFD) [RFC5880], and others/

2.       Page 32 – difficult to parse sentence

      Old/For Encoding type, 1 is defined for PWid FEC element format,
and 2 is defined for the Generalized PWid FEC Element format [RFC4447]./

      New/ For type encoding type, the following two values are defined
within this document:

-          Type 1 for PWid FEC element format (see section 6.4.1.), and

-          Type 2 for Generalized PWid FEC Element format [RFC4447



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From: Greg Mirsky <gregimirsky@gmail.com>
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Subject: Re: [Pals] Benoit Claise's No Objection on draft-ietf-pals-endpoint-fast-protection-04: (with COMMENT)
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--001a114027fc90aacf0543b4b6ea
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Dear Authors, Benoit, et. al,
I've just noticed, from Benoit comment to p.10 of the document, that BFD,
defined in RFC 5880, being mistakenly expanded as Bidirectional Failure
Detection while it is Bidirectional Forwarding Detection.

Regards,
Greg

On Thu, Dec 15, 2016 at 5:46 AM, Benoit Claise <bclaise@cisco.com> wrote:

> Benoit Claise has entered the following ballot position for
> draft-ietf-pals-endpoint-fast-protection-04: No Objection
>
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut this
> introductory paragraph, however.)
>
>
> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
>
>
> The document, along with other ballot positions, can be found here:
> https://datatracker.ietf.org/doc/draft-ietf-pals-endpoint-fast-protection=
/
>
>
>
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>
> Editorial nits (From Sue Hares, part of her OPS-DIR review)
>
> 1.       Page 10  - style makes difficult reading of sentence  (very
> minor nit).
>
> OLD /A PLR MUST Be able to detect a failure by using a rapid mechanism,
> such as physical layer failure detection, Bidirectional failure detection
> (BFD) [RFC5880], etc. /
>
> NEW /A PLR MUST Be able to detect a failure by using a rapid mechanism,
> such as physical layer failure detection, Bidirectional failure detection
> (BFD) [RFC5880], and others/
>
> 2.       Page 32 =E2=80=93 difficult to parse sentence
>
>       Old/For Encoding type, 1 is defined for PWid FEC element format,
> and 2 is defined for the Generalized PWid FEC Element format [RFC4447]./
>
>       New/ For type encoding type, the following two values are defined
> within this document:
>
> -          Type 1 for PWid FEC element format (see section 6.4.1.), and
>
> -          Type 2 for Generalized PWid FEC Element format [RFC4447
>
>
> _______________________________________________
> Pals mailing list
> Pals@ietf.org
> https://www.ietf.org/mailman/listinfo/pals
>

--001a114027fc90aacf0543b4b6ea
Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr">Dear Authors, Benoit, et. al,<div>I&#39;ve just noticed, f=
rom Benoit comment to p.10 of the document, that BFD, defined in RFC 5880, =
being mistakenly expanded as Bidirectional Failure Detection while it is Bi=
directional Forwarding Detection.</div><div><br></div><div>Regards,</div><d=
iv>Greg</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote=
">On Thu, Dec 15, 2016 at 5:46 AM, Benoit Claise <span dir=3D"ltr">&lt;<a h=
ref=3D"mailto:bclaise@cisco.com" target=3D"_blank">bclaise@cisco.com</a>&gt=
;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 =
.8ex;border-left:1px #ccc solid;padding-left:1ex">Benoit Claise has entered=
 the following ballot position for<br>
draft-ietf-pals-endpoint-fast-<wbr>protection-04: No Objection<br>
<br>
When responding, please keep the subject line intact and reply to all<br>
email addresses included in the To and CC lines. (Feel free to cut this<br>
introductory paragraph, however.)<br>
<br>
<br>
Please refer to <a href=3D"https://www.ietf.org/iesg/statement/discuss-crit=
eria.html" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/iesg/<=
wbr>statement/discuss-criteria.<wbr>html</a><br>
for more information about IESG DISCUSS and COMMENT positions.<br>
<br>
<br>
The document, along with other ballot positions, can be found here:<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-pals-endpoint-fast-p=
rotection/" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.o=
rg/<wbr>doc/draft-ietf-pals-endpoint-<wbr>fast-protection/</a><br>
<br>
<br>
<br>
------------------------------<wbr>------------------------------<wbr>-----=
-----<br>
COMMENT:<br>
------------------------------<wbr>------------------------------<wbr>-----=
-----<br>
<br>
Editorial nits (From Sue Hares, part of her OPS-DIR review)<br>
<br>
1.=C2=A0 =C2=A0 =C2=A0 =C2=A0Page 10=C2=A0 - style makes difficult reading =
of sentence=C2=A0 (very<br>
minor nit).<br>
<br>
OLD /A PLR MUST Be able to detect a failure by using a rapid mechanism,<br>
such as physical layer failure detection, Bidirectional failure detection<b=
r>
(BFD) [RFC5880], etc. /<br>
<br>
NEW /A PLR MUST Be able to detect a failure by using a rapid mechanism,<br>
such as physical layer failure detection, Bidirectional failure detection<b=
r>
(BFD) [RFC5880], and others/<br>
<br>
2.=C2=A0 =C2=A0 =C2=A0 =C2=A0Page 32 =E2=80=93 difficult to parse sentence<=
br>
<br>
=C2=A0 =C2=A0 =C2=A0 Old/For Encoding type, 1 is defined for PWid FEC eleme=
nt format,<br>
and 2 is defined for the Generalized PWid FEC Element format [RFC4447]./<br=
>
<br>
=C2=A0 =C2=A0 =C2=A0 New/ For type encoding type, the following two values =
are defined<br>
within this document:<br>
<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Type 1 for PWid FEC element format (see=
 section 6.4.1.), and<br>
<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Type 2 for Generalized PWid FEC Element=
 format [RFC4447<br>
<br>
<br>
______________________________<wbr>_________________<br>
Pals mailing list<br>
<a href=3D"mailto:Pals@ietf.org">Pals@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/pals" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/pals</a><br>
</blockquote></div><br></div>

--001a114027fc90aacf0543b4b6ea--


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Subject: Re: [Pals] Suresh Krishnan's Discuss on draft-ietf-pals-endpoint-fast-protection-04: (with DISCUSS)
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Hi Yimin,=0A=
=0A=
On 12/15/2016 08:17 AM, Yimin Shen wrote:=0A=
> Hi Suresh, Carlos,=0A=
>=0A=
> After rethinking of this, yes, I think you=92ve made a good point, and I =
agree with you on that proposal. We will add encodings for IPv6 PE addresse=
s for PWid and Generalized PWid in sections 6.4.1 and 6.4.2, respectively. =
This will be in a manner similar to RFC 6829.=0A=
>=0A=
> Thanks again for your review and this valuable comment!=0A=
=0A=
Sounds good. I will clear once the new version is posted.=0A=
=0A=
Thanks=0A=
Suresh=0A=
=0A=
=0A=


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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Greg Mirsky <gregimirsky@gmail.com>
Thread-Topic: [Pals] Benoit Claise's No Objection on draft-ietf-pals-endpoint-fast-protection-04: (with COMMENT)
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From: Yimin Shen <yshen@juniper.net>
To: Benoit Claise <bclaise@cisco.com>, The IESG <iesg@ietf.org>
Thread-Topic: Benoit Claise's No Objection on draft-ietf-pals-endpoint-fast-protection-04: (with COMMENT)
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Subject: Re: [Pals] Benoit Claise's No Objection on draft-ietf-pals-endpoint-fast-protection-04: (with COMMENT)
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From: Yimin Shen <yshen@juniper.net>
To: Greg Mirsky <gregimirsky@gmail.com>, Benoit Claise <bclaise@cisco.com>
Thread-Topic: [Pals] Benoit Claise's No Objection on draft-ietf-pals-endpoint-fast-protection-04: (with COMMENT)
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Cc: "draft-ietf-pals-endpoint-fast-protection@ietf.org" <draft-ietf-pals-endpoint-fast-protection@ietf.org>, "pals-chairs@ietf.org" <pals-chairs@ietf.org>, The IESG <iesg@ietf.org>, "pals@ietf.org" <pals@ietf.org>, Stewart Bryant <stewart.bryant@gmail.com>, "wim.henderickx@nokia.com" <wim.henderickx@nokia.com>, Susan Hares <shares@ndzh.com>
Subject: Re: [Pals] Benoit Claise's No Objection on draft-ietf-pals-endpoint-fast-protection-04: (with COMMENT)
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From: Yimin Shen <yshen@juniper.net>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, The IESG <iesg@ietf.org>
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Subject: Re: [Pals] Stephen Farrell's No Objection on draft-ietf-pals-endpoint-fast-protection-04: (with COMMENT)
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From: Yimin Shen <yshen@juniper.net>
To: Alia Atlas <akatlas@gmail.com>, The IESG <iesg@ietf.org>
Thread-Topic: Alia Atlas' Yes on draft-ietf-pals-endpoint-fast-protection-04: (with COMMENT)
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Cc: "draft-ietf-pals-endpoint-fast-protection@ietf.org" <draft-ietf-pals-endpoint-fast-protection@ietf.org>, "pals-chairs@ietf.org" <pals-chairs@ietf.org>, "pals@ietf.org" <pals@ietf.org>, Stewart Bryant <stewart.bryant@gmail.com>
Subject: Re: [Pals] Alia Atlas' Yes on draft-ietf-pals-endpoint-fast-protection-04: (with COMMENT)
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From: Yimin Shen <yshen@juniper.net>
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, Greg Mirsky <gregimirsky@gmail.com>
Thread-Topic: [Pals] Benoit Claise's No Objection on draft-ietf-pals-endpoint-fast-protection-04: (with COMMENT)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/pals/4A74jov26ZmxQ-PG-c7OC9PaJq8>
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Subject: Re: [Pals] Benoit Claise's No Objection on draft-ietf-pals-endpoint-fast-protection-04: (with COMMENT)
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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Sat, 17 Dec 2016 18:17:05 -0500
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Subject: [Pals] Fwd: [sfc] Fwd: [rfc-i] The RFC Format docs are now RFCs
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PALSers,

Please see the forwarded emails below from Joel and Heather.

Cheers,
Andy

---------- Forwarded message ----------
From: Joel M. Halpern <jmh@joelhalpern.com>
Date: Fri, Dec 16, 2016 at 3:44 PM
Subject: [sfc] Fwd: [rfc-i] The RFC Format docs are now RFCs
To: "lisp@ietf.org" <lisp@ietf.org>, "sfc@ietf.org" <sfc@ietf.org>


The RFCs described the intended evolution of the RFC Format are, as per the
notice from Heather below, now available.  Please take a look.

The IESG has indicated that as the tooling development progress, they will
allow these features in IDs.  They also note that early testing is
obviously welcome.

Yours,
Joel

-------- Forwarded Message --------
Subject:        [rfc-i] The RFC Format docs are now RFCs
Date:   Fri, 16 Dec 2016 09:14:27 -0800
From:   Heather Flanagan (RFC Series Editor) <rse@rfc-editor.org>
To:     rfc-interest@rfc-editor.org, ietf@ietf.org



Hello all,

The RFC Format requirements documents were published this morning. This
represents an enormous amount of work on the part of the RFC Format Design
Team, and an enormous amount of patience and feedback from the community.
Of course, the work isn't quite done - all of these RFCs will undergo a
-bis cycle so we can document the "as built" instead of just the "as
proposed." But regardless of the amount of work still to come, this is a
big milestone for the project!

So, thank you all, and stay tuned for the next steps of code development,
testing, and collecting feedback!

-Heather Flanagan, RSE

The RFC Format Design Team:

  * Nevil Brownlee (ISE)
  * Heather Flanagan (RSE)
  * Tony Hansen
  * Joe Hildebrand
  * Paul Hoffman
  * Ted Lemon
  * Julian Reschke
  * Adam Roach
  * Alice Russo
  * Robert Sparks (Tools Team liaison)
  * Dave Thaler


The RFCs, in suggested reading order:

  * "RFC Format Framework " - https://www.rfc-editor.org/info/rfc7990
  * "The "xml2rfc" Version 3 Vocabulary" -
    https://www.rfc-editor.org/info/rfc7991
  * "HTML Format for RFCs" - https://www.rfc-editor.org/info/rfc7992
  * "Cascading Style Sheets (CSS) Requirements for RFCs" -
    https://www.rfc-editor.org/info/rfc7993
  * "Requirements for Plain-Text RFCs" -
    https://www.rfc-editor.org/info/rfc7994
  * "PDF Format for RFCs" - https://www.rfc-editor.org/info/rfc7995
  * "SVG Drawings for RFCs: SVG 1.2 RFC" -
    https://www.rfc-editor.org/info/rfc7996
  * "The Use of Non-ASCII Characters in RFCs" -
    https://www.rfc-editor.org/info/rfc7997
  * ""xml2rfc" Version 3 Preparation Tool Description" -
    https://www.rfc-editor.org/info/rfc7997


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

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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">PALSers,<div><br></div><div>Please see the forwarded email=
s below from Joel and Heather.</div><div><br></div><div>Cheers,</div><div>A=
ndy</div><div><br></div><div><div class=3D"gmail_quote">---------- Forwarde=
d message ----------<br>From: <b class=3D"gmail_sendername">Joel M. Halpern=
</b> <span dir=3D"ltr">&lt;<a href=3D"mailto:jmh@joelhalpern.com">jmh@joelh=
alpern.com</a>&gt;</span><br>Date: Fri, Dec 16, 2016 at 3:44 PM<br>Subject:=
 [sfc] Fwd: [rfc-i] The RFC Format docs are now RFCs<br>To: &quot;<a href=
=3D"mailto:lisp@ietf.org">lisp@ietf.org</a>&quot; &lt;<a href=3D"mailto:lis=
p@ietf.org">lisp@ietf.org</a>&gt;, &quot;<a href=3D"mailto:sfc@ietf.org">sf=
c@ietf.org</a>&quot; &lt;<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a>&g=
t;<br><br><br>The RFCs described the intended evolution of the RFC Format a=
re, as per the notice from Heather below, now available.=C2=A0 Please take =
a look.<br>
<br>
The IESG has indicated that as the tooling development progress, they will =
allow these features in IDs.=C2=A0 They also note that early testing is obv=
iously welcome.<br>
<br>
Yours,<br>
Joel<span class=3D""><br>
<br>
-------- Forwarded Message --------<br>
Subject:=C2=A0 =C2=A0 =C2=A0 =C2=A0 [rfc-i] The RFC Format docs are now RFC=
s<br>
Date:=C2=A0 =C2=A0Fri, 16 Dec 2016 09:14:27 -0800<br>
From:=C2=A0 =C2=A0Heather Flanagan (RFC Series Editor) &lt;<a href=3D"mailt=
o:rse@rfc-editor.org" target=3D"_blank">rse@rfc-editor.org</a>&gt;<br>
To:=C2=A0 =C2=A0 =C2=A0<a href=3D"mailto:rfc-interest@rfc-editor.org" targe=
t=3D"_blank">rfc-interest@rfc-editor.org</a>, <a href=3D"mailto:ietf@ietf.o=
rg" target=3D"_blank">ietf@ietf.org</a><br>
<br>
<br>
<br>
Hello all,<br>
<br>
The RFC Format requirements documents were published this morning. This rep=
resents an enormous amount of work on the part of the RFC Format Design Tea=
m, and an enormous amount of patience and feedback from the community. Of c=
ourse, the work isn&#39;t quite done - all of these RFCs will undergo a -bi=
s cycle so we can document the &quot;as built&quot; instead of just the &qu=
ot;as proposed.&quot; But regardless of the amount of work still to come, t=
his is a big milestone for the project!<br>
<br>
So, thank you all, and stay tuned for the next steps of code development, t=
esting, and collecting feedback!<br>
<br>
-Heather Flanagan, RSE<br>
<br>
The RFC Format Design Team:<br>
<br></span><span class=3D"">
=C2=A0 * Nevil Brownlee (ISE)<br>
=C2=A0 * Heather Flanagan (RSE)<br>
=C2=A0 * Tony Hansen<br>
=C2=A0 * Joe Hildebrand<br>
=C2=A0 * Paul Hoffman<br>
=C2=A0 * Ted Lemon<br>
=C2=A0 * Julian Reschke<br>
=C2=A0 * Adam Roach<br>
=C2=A0 * Alice Russo<br></span>
=C2=A0 * Robert Sparks (Tools Team liaison)<br>
=C2=A0 * Dave Thaler<span class=3D""><br>
<br>
<br>
The RFCs, in suggested reading order:<br>
<br></span>
=C2=A0 * &quot;RFC Format Framework &quot; - <a href=3D"https://www.rfc-edi=
tor.org/info/rfc7990" rel=3D"noreferrer" target=3D"_blank">https://www.rfc-=
editor.org/inf<wbr>o/rfc7990</a><br>
=C2=A0 * &quot;The &quot;xml2rfc&quot; Version 3 Vocabulary&quot; -<br>
=C2=A0 =C2=A0 <a href=3D"https://www.rfc-editor.org/info/rfc7991" rel=3D"no=
referrer" target=3D"_blank">https://www.rfc-editor.org/inf<wbr>o/rfc7991</a=
><br>
=C2=A0 * &quot;HTML Format for RFCs&quot; - <a href=3D"https://www.rfc-edit=
or.org/info/rfc7992" rel=3D"noreferrer" target=3D"_blank">https://www.rfc-e=
ditor.org/inf<wbr>o/rfc7992</a><br>
=C2=A0 * &quot;Cascading Style Sheets (CSS) Requirements for RFCs&quot; -<b=
r>
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=C2=A0 * &quot;&quot;xml2rfc&quot; Version 3 Preparation Tool Description&q=
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From nobody Mon Dec 19 09:52:18 2016
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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Mon, 19 Dec 2016 12:51:53 -0500
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Cc: Stewart Bryant <stewart.bryant@gmail.com>, "BRUNGARD, DEBORAH A \(ATTLABS\)" <db3546@att.com>
Subject: [Pals] PALS meeting in Chicago?
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PALSers,

It=E2=80=99s time to request a session for Chicago if we need one.

Is there anyone on this list with anything that they would like to present
at a PALS meeting in Chicago?

We haven=E2=80=99t met in the last two IETF meetings, but 2016 was an extre=
mely
productive year, with nine RFCs published, one more currently with the RFC
Editor, four more currently with the IESG, one in WG last call, and two
final WG drafts in progress, draft-ietf-pals-vpls-pim-snooping and
draft-ietf-pals-p2mp-pw-lsp-ping.

Please let Stewart and me know if there=E2=80=99s anything you would like t=
o
present in Chicago, either for any of the existing drafts, or if you wish
to propose a new draft for the WG.

If we don=E2=80=99t hear any requests reasonably soon (say, by the end of t=
he
year), we=E2=80=99ll let the secretariat know that we won=E2=80=99t be meet=
ing.

Thanks,
Andy

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<div dir=3D"ltr">PALSers,<div><br></div><div>It=E2=80=99s time to request a=
 session for Chicago if we need one.</div><div><br></div><div>Is there anyo=
ne on this list with anything that they would like to present at a PALS mee=
ting in Chicago?</div><div><br></div><div>We haven=E2=80=99t met in the las=
t two IETF meetings, but 2016 was an extremely productive year, with nine R=
FCs published, one more currently with the RFC Editor, four more currently =
with the IESG, one in WG last call, and two final WG drafts in progress,=C2=
=A0draft-ietf-pals-vpls-pim-snooping and draft-ietf-pals-p2mp-pw-lsp-ping.<=
/div><div><br></div><div>Please let Stewart and me know if there=E2=80=99s =
anything you would like to present in Chicago, either for any of the existi=
ng drafts, or if you wish to propose a new draft for the WG.</div><div><br>=
</div><div>If we don=E2=80=99t hear any requests reasonably soon (say, by t=
he end of the year), we=E2=80=99ll let the secretariat know that we won=E2=
=80=99t be meeting.</div><div><br></div><div>Thanks,</div><div>Andy</div><d=
iv><br></div></div>

--001a1140a6046cc08d05440694bd--


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