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From: "BRUNGARD, DEBORAH A" <db3546@att.com>
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Hi,

As a follow-up to the presentation in the rtgwg, Stephen has set up a maili=
ng list:
https://www.ietf.org/mailman/listinfo/Model-t

I encourage you to join it to help sort out routing related aspects-

Deborah


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<p class=3D"MsoNormal">Hi,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">As a follow-up to the presentation in the rtgwg, Ste=
phen has set up a mailing list:<o:p></o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://www.ietf.org/mailman/listinfo/Mod=
el-t">https://www.ietf.org/mailman/listinfo/Model-t</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I encourage you to join it to help sort out routing =
related aspects-<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Deborah<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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From nobody Thu Aug  1 16:32:59 2019
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From: Yingzhen Qu via Datatracker <noreply@ietf.org>
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Subject: [RTG-DIR] Rtgdir telechat review of draft-ietf-babel-rfc6126bis-11
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Reviewer: Yingzhen Qu
Review result: Has Issues

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

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

Document: draft-ietf-babel-rfc6126bis
Reviewer: Yingzhen Qu
Review Date: 1 August 2019
Intended Status: Standards Track

Summary:
This document describes the Babel routing protocol, and obsoletes RFC 6126 and
7557. Note: both RFC 6126 and 7557 are experimental, the current bis version is
standards track. I don’t know the history behind, but just want to point it out.

Overall comments:
The document is mostly well written.
I’m not a native speaker, so I’d leave all language nits to RFC editors.

Issues: (the line number is used is from idnits)

There are security concerns raised by Secdir review:
https://datatracker.ietf.org/doc/review-ietf-babel-rfc6126bis-10-secdir-lc-kaufman-2019-06-28/

The description about packet trailer is in RFC 7557 section 2.5, but not
included in the bis version. Considering this document will obsolete RFC 7557,
I suppose it should be self-complete, so readers don’t need to go back to RFC
7557 for more information.

There are multiple places in the document about TLV/Sub-TLV being
“self-terminating”, but I didn’t find what it means. Maybe I’m missing
something here?

Section 1.1
“unmanaged and wireless environment”, what does “unmanaged” mean here?

Section 3.2.3
The interface Hello seqno is changed to outing multicast hello seqno, however
there is no description about unicast hello at all. While I was reading it, I
kept thinking what if it’s unicast hello? Is there a unicast hello timer
needed? From later sections, I realized there are unicast hellos. So I’d
suggest add some descriptions to avoid the confusion.

Section 3.2.4
There is “the expected incoming Unicast Hello sequence number” and “the
outgoing Unicast Hello sequence number”, but it was not mentioned in section
3.2.3 (related with previous comment).

Section 3.8.1.1
After a node receives a route request, if the given prefix doesn’t exist in its
route table, it MUST send a retraction for that prefix. So my question is
whether a node is allowed to send multiple explicit requests for a given
prefix? If so, what happens if both retractions and updates are received?

Section 4.4
1616    4.4.  Sub-TLV Format

1618       Every TLV carries an explicit length in its header; however, most
1619       TLVs are self-terminating, in the sense that it is possible to
1620       determine the length of the body without reference to the explicit
1621       Length field.  If a TLV has a self-terminating format, then it MAY
1622       allow a sequence of sub-TLVs to follow the body.
This section is about Sub-TLV, however the description language in this
paragraph is mainly about TLV.

Section 4.5
it says that “an implementation may choose to use a dedicated stateless parser
to parse the packet trailer”. Will the packet trailer be able to use the state
parser if there are state there useful or just for implementation purpose?
Although there is no packet trailer defined at this moment.

Section 4.5
1674       parsing a TLV MUST update the parser state even if the TLV is
1675       otherwise ignored due to an unknown mandatory sub-TLV.

Section 4.6.5
1805                 send a new scheduled Hello TLV with the same setting of the
1806                 Unicast flag.  If this is 0, then this Hello represents an
I’d suggest changing the text to “the same setting of flags” instead of “the
same setting of the Unicast flag”, considering the flags will be extended later.

Nits:

1049       metric) from a neighbour neigh with a link cost value equal to cost,
1050       it checks whether it already has a route table entry indexed by
[neighbour neigh] => [neighbour]

Thanks,
Yingzhen


From nobody Fri Aug  2 01:21:17 2019
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Subject: Re: [RTG-DIR] Rtgdir telechat review of draft-ietf-babel-rfc6126bis-11
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Dear Mr Qu,

Thank you for your review.

> The description about packet trailer is in RFC 7557 section 2.5, but not
> included in the bis version. Considering this document will obsolete RFC 7557,
> I suppose it should be self-complete, so readers don’t need to go back to RFC
> 7557 for more information.

The packet trailer is described in Section 4.2.

> There are multiple places in the document about TLV/Sub-TLV being
> “self-terminating”, but I didn’t find what it means. Maybe I’m missing
> something here?

This is defined in Section 4.4.  I have checked that all uses of
self-terminating occur after its definition.

> Section 1.1
> “unmanaged and wireless environment”, what does “unmanaged” mean here?

Not being actively managed by a human administrator.  This is a non-normative
section.  Please let me know if I'm using this term badly.

> Section 3.2.3
> The interface Hello seqno is changed to outing multicast hello seqno, however
> there is no description about unicast hello at all.

Unicast Hellos are per-neighbour, so they appear in Section 3.2.4 (Section
3.2.3 describes per-interface data structure while 3.2.4 describes
per-neighbour structures).  Both kinds of Hellos are described in more
detail in Section 3.4.1.

> While I was reading it, I kept thinking what if it’s unicast hello? Is
> there a unicast hello timer needed?

There is one, see Section 3.2.4, penultimate paragraph.

> From later sections, I realized there are unicast hellos. So I’d suggest
> add some descriptions to avoid the confusion.

Sections 3.2.4 and 3.4.1.

> Section 3.2.4
> There is “the expected incoming Unicast Hello sequence number” and “the
> outgoing Unicast Hello sequence number”, but it was not mentioned in section
> 3.2.3 (related with previous comment).

That's right.  Section 3.2.3 describes per-interface data.  Section 3.2.4
describes per-neighbour data.  Multicast Hellos are per-interface.
Unicast Hellos are per-neighbour.

> Section 3.8.1.1
> After a node receives a route request, if the given prefix doesn’t exist in its
> route table, it MUST send a retraction for that prefix. So my question is
> whether a node is allowed to send multiple explicit requests for a given
> prefix?

There's nothing forbidding it.  It may send multiple requests to different
neighbours (over unicast), or multiple requests on different interfaces
(over multicast).  There's also nothing forbidding a node from sending
multiple requests to the same destination, e.g. to compensate for packet
loss.

(Our implementation experience shows that, at least over 802.11, such
aggressive behaviour is not useful, it increases noise without having
a measurable effect on convergence time, hence the SHOULD in Section
3.8.2.3 which only requires a single request.  However, further research
might yield new insights, which is why this document does not explicitly
disallow such behaviour.)

> If so, what happens if both retractions and updates are received?

The procedure described in Section 3.5.4 is run for each received update
or retraction, which results in the construction of the data structures
used as input for the precedure described in Section 3.6.

> 1616    4.4.  Sub-TLV Format

> This section is about Sub-TLV, however the description language in this
> paragraph is mainly about TLV.

Good catch, thanks.  I'll fix that.

> Section 4.5
> it says that “an implementation may choose to use a dedicated stateless parser
> to parse the packet trailer”. Will the packet trailer be able to use the state
> parser if there are state there useful or just for implementation purpose?

I do not understand this comment.  Please clarify.

> Although there is no packet trailer defined at this moment.

Section 4.2.

> Section 4.5
> 1674       parsing a TLV MUST update the parser state even if the TLV is
> 1675       otherwise ignored due to an unknown mandatory sub-TLV.

I believe you may have forgotten to write your comment.

> Section 4.6.5
> 1805                 send a new scheduled Hello TLV with the same setting of the
> 1806                 Unicast flag.  If this is 0, then this Hello represents an
> I’d suggest changing the text to “the same setting of flags” instead of “the
> same setting of the Unicast flag”, considering the flags will be extended later.

I disagree.  This paragraph is about the multicast/unicast dichotomy, not
about future flags of an informative nature.

> Nits:

> 1049       metric) from a neighbour neigh with a link cost value equal to cost,
> 1050       it checks whether it already has a route table entry indexed by
> [neighbour neigh] => [neighbour]

I disagree.  We're defining the variable neigh, which we use in the next
sequence.

Regards,

-- Juliusz Chroboczek


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>> 1616    4.4.  Sub-TLV Format

>> This section is about Sub-TLV, however the description language in this
>> paragraph is mainly about TLV.

> Good catch, thanks.

Actually, this section starts by describing how sub-TLVs fit within TLVs,
so it's correct as it stands.

-- Juliusz Chroboczek


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Hi Juliusz,

Thanks for your reply, please see my response below starting with [YQ].

Thanks,
Yingzhen

On Fri, Aug 2, 2019 at 1:20 AM Juliusz Chroboczek <jch@irif.fr> wrote:

> Dear Mr Qu,
>
> Thank you for your review.
>
> > The description about packet trailer is in RFC 7557 section 2.5, but no=
t
> > included in the bis version. Considering this document will obsolete RF=
C
> 7557,
> > I suppose it should be self-complete, so readers don=E2=80=99t need to =
go back
> to RFC
> > 7557 for more information.
>
> The packet trailer is described in Section 4.2.
>
> [YQ]: In RFC 7557 section 2.5, there is a clear description about how the
packet trailer length is calculated etc. Personally I feel it's more
straightforward, but if you think section 4.2 is enough, I'm not going to
insist.


> > There are multiple places in the document about TLV/Sub-TLV being
> > =E2=80=9Cself-terminating=E2=80=9D, but I didn=E2=80=99t find what it m=
eans. Maybe I=E2=80=99m missing
> > something here?
>
> This is defined in Section 4.4.  I have checked that all uses of
> self-terminating occur after its definition.
>
> [YQ]: in section 4.4, it says self-terminating can be used to determine
the length of the TLV body without using the length field. This is clear,
however what does it look like? how to detect it? maybe I'm missing
something here.


> > Section 1.1
> > =E2=80=9Cunmanaged and wireless environment=E2=80=9D, what does =E2=80=
=9Cunmanaged=E2=80=9D mean here?
>
> Not being actively managed by a human administrator.  This is a
> non-normative
> section.  Please let me know if I'm using this term badly.
>
> [YQ]: my understanding is unmanaged can mean anything, like no management
at all. I don't think it's a good term, especially put together with
wireless.  maybe try to add a bit more explanation?

> Section 3.2.3
> > The interface Hello seqno is changed to outing multicast hello seqno,
> however
> > there is no description about unicast hello at all.
>
> Unicast Hellos are per-neighbour, so they appear in Section 3.2.4 (Sectio=
n
> 3.2.3 describes per-interface data structure while 3.2.4 describes
> per-neighbour structures).  Both kinds of Hellos are described in more
> detail in Section 3.4.1.
>
[YQ]: there is nothing wrong with current text. I was thinking of adding
unicast just for easy readability. same for the following three related
questions.

>
> > While I was reading it, I kept thinking what if it=E2=80=99s unicast he=
llo? Is
> > there a unicast hello timer needed?
>
> There is one, see Section 3.2.4, penultimate paragraph.
>
> > From later sections, I realized there are unicast hellos. So I=E2=80=99=
d suggest
> > add some descriptions to avoid the confusion.
>
> Sections 3.2.4 and 3.4.1.
>
> > Section 3.2.4
> > There is =E2=80=9Cthe expected incoming Unicast Hello sequence number=
=E2=80=9D and =E2=80=9Cthe
> > outgoing Unicast Hello sequence number=E2=80=9D, but it was not mention=
ed in
> section
> > 3.2.3 (related with previous comment).
>
> That's right.  Section 3.2.3 describes per-interface data.  Section 3.2.4
> describes per-neighbour data.  Multicast Hellos are per-interface.
> Unicast Hellos are per-neighbour.
>
> > Section 3.8.1.1
> > After a node receives a route request, if the given prefix doesn=E2=80=
=99t exist
> in its
> > route table, it MUST send a retraction for that prefix. So my question =
is
> > whether a node is allowed to send multiple explicit requests for a give=
n
> > prefix?
>
> There's nothing forbidding it.  It may send multiple requests to differen=
t
> neighbours (over unicast), or multiple requests on different interfaces
> (over multicast).  There's also nothing forbidding a node from sending
> multiple requests to the same destination, e.g. to compensate for packet
> loss.
>
> (Our implementation experience shows that, at least over 802.11, such
> aggressive behaviour is not useful, it increases noise without having
> a measurable effect on convergence time, hence the SHOULD in Section
> 3.8.2.3 which only requires a single request.  However, further research
> might yield new insights, which is why this document does not explicitly
> disallow such behaviour.)
>
> [YQ] thanks for the explanation. I'm just wondering whether we should
document it somewhere?


> > If so, what happens if both retractions and updates are received?
>
> The procedure described in Section 3.5.4 is run for each received update
> or retraction, which results in the construction of the data structures
> used as input for the precedure described in Section 3.6.
>

[YQ]: got it.


> > 1616    4.4.  Sub-TLV Format
>
> > This section is about Sub-TLV, however the description language in this
> > paragraph is mainly about TLV.
>
> Good catch, thanks.  I'll fix that.
>

[YQ]: same as comments regarding unicast hello, current text is not wrong.

>
> > Section 4.5
> > it says that =E2=80=9Can implementation may choose to use a dedicated s=
tateless
> parser
> > to parse the packet trailer=E2=80=9D. Will the packet trailer be able t=
o use the
> state
> > parser if there are state there useful or just for implementation
> purpose?
>
> I do not understand this comment.  Please clarify.
>
> [YQ]: My understanding is Babel uses a stateful parser, and TLVs in the
packet trailer are not allowed to modify the state. So the text here is
suggesting to implement a stateless parser for packet trailer. so the
question is: will packet trailer to able to use/read the state? is the
stateless parser suggested just for implementation simplicity?


> > Although there is no packet trailer defined at this moment.
>
> Section 4.2.
>
[YQ]: I meant besides the pad1 and padN, there is no real functional packet
trailer defined at this moment, but it's open for extensions.

>
> > Section 4.5
> > 1674       parsing a TLV MUST update the parser state even if the TLV i=
s
> > 1675       otherwise ignored due to an unknown mandatory sub-TLV.
>
> I believe you may have forgotten to write your comment.
>
> [YQ]: is it correct that the parser state is updated by a TLV even if the
TLV is ignored due to unknown sub-tlv? what about a TLV ignored due to
other reasons?

> Section 4.6.5
> > 1805                 send a new scheduled Hello TLV with the same
> setting of the
> > 1806                 Unicast flag.  If this is 0, then this Hello
> represents an
> > I=E2=80=99d suggest changing the text to =E2=80=9Cthe same setting of f=
lags=E2=80=9D instead of
> =E2=80=9Cthe
> > same setting of the Unicast flag=E2=80=9D, considering the flags will b=
e
> extended later.
>
> I disagree.  This paragraph is about the multicast/unicast dichotomy, not
> about future flags of an informative nature.
>
> [YQ]: then I misunderstood it. I thought it was meant to copy the entire
flag field.

> Nits:
>
> > 1049       metric) from a neighbour neigh with a link cost value equal
> to cost,
> > 1050       it checks whether it already has a route table entry indexed
> by
> > [neighbour neigh] =3D> [neighbour]
>
> I disagree.  We're defining the variable neigh, which we use in the next
> sequence.
>
> [YQ]: it seems that this is the only place using "neigh", so I thought it
was a typo. I would suggest some clarification.



> Regards,
>
> -- Juliusz Chroboczek
>

--0000000000000b4511058f814b11
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi Juliusz,</div><div><br></div><div>Thanks for your =
reply, please see my response below starting with [YQ].<br></div><div><br><=
/div><div>Thanks,</div><div>Yingzhen</div><br><div class=3D"gmail_quote"><d=
iv class=3D"gmail_attr" dir=3D"ltr">On Fri, Aug 2, 2019 at 1:20 AM Juliusz =
Chroboczek &lt;<a href=3D"mailto:jch@irif.fr" target=3D"_blank">jch@irif.fr=
</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:=
0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);borde=
r-left-width:1px;border-left-style:solid">Dear Mr Qu,<br>
<br>
Thank you for your review.<br>
<br>
&gt; The description about packet trailer is in RFC 7557 section 2.5, but n=
ot<br>
&gt; included in the bis version. Considering this document will obsolete R=
FC 7557,<br>
&gt; I suppose it should be self-complete, so readers don=E2=80=99t need to=
 go back to RFC<br>
&gt; 7557 for more information.<br>
<br>
The packet trailer is described in Section 4.2.<br>
<br></blockquote><div>[YQ]: In RFC 7557 section 2.5, there is a clear descr=
iption about how the packet trailer length is calculated etc. Personally I =
feel it&#39;s more straightforward, but if you think section 4.2 is enough,=
 I&#39;m not going to insist.</div><div>=C2=A0</div><blockquote class=3D"gm=
ail_quote" style=3D"margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-c=
olor:rgb(204,204,204);border-left-width:1px;border-left-style:solid">
&gt; There are multiple places in the document about TLV/Sub-TLV being<br>
&gt; =E2=80=9Cself-terminating=E2=80=9D, but I didn=E2=80=99t find what it =
means. Maybe I=E2=80=99m missing<br>
&gt; something here?<br>
<br>
This is defined in Section 4.4.=C2=A0 I have checked that all uses of<br>
self-terminating occur after its definition.<br><br></blockquote><div>[YQ]:=
 in section 4.4, it says self-terminating can be used to determine the leng=
th of the TLV body without using the length field. This is clear, however w=
hat does it look like? how to detect it? maybe I&#39;m missing something he=
re.</div><div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin=
:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);bord=
er-left-width:1px;border-left-style:solid">
&gt; Section 1.1<br>
&gt; =E2=80=9Cunmanaged and wireless environment=E2=80=9D, what does =E2=80=
=9Cunmanaged=E2=80=9D mean here?<br>
<br>
Not being actively managed by a human administrator.=C2=A0 This is a non-no=
rmative<br>
section.=C2=A0 Please let me know if I&#39;m using this term badly.<br>
<br></blockquote><div>[YQ]: my understanding is unmanaged can mean anything=
, like no management at all. I don&#39;t think it&#39;s a good term, especi=
ally put together with wireless. =C2=A0maybe try to add a bit more explanat=
ion? =C2=A0</div><div><br></div><blockquote class=3D"gmail_quote" style=3D"=
margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204=
);border-left-width:1px;border-left-style:solid">
&gt; Section 3.2.3<br>
&gt; The interface Hello seqno is changed to outing multicast hello seqno, =
however<br>
&gt; there is no description about unicast hello at all.<br>
<br>
Unicast Hellos are per-neighbour, so they appear in Section 3.2.4 (Section<=
br>
3.2.3 describes per-interface data structure while 3.2.4 describes<br>
per-neighbour structures).=C2=A0 Both kinds of Hellos are described in more=
<br>
detail in Section 3.4.1.<br></blockquote><div>[YQ]: there is nothing wrong =
with current text. I was thinking of adding unicast just for easy readabili=
ty. same for the following three related questions.<br></div><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;padding-left:1ex;bord=
er-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:soli=
d">
<br>
&gt; While I was reading it, I kept thinking what if it=E2=80=99s unicast h=
ello? Is<br>
&gt; there a unicast hello timer needed?<br>
<br>
There is one, see Section 3.2.4, penultimate paragraph.<br>
<br>
&gt; From later sections, I realized there are unicast hellos. So I=E2=80=
=99d suggest<br>
&gt; add some descriptions to avoid the confusion.<br>
<br>
Sections 3.2.4 and 3.4.1.<br>
<br>
&gt; Section 3.2.4<br>
&gt; There is =E2=80=9Cthe expected incoming Unicast Hello sequence number=
=E2=80=9D and =E2=80=9Cthe<br>
&gt; outgoing Unicast Hello sequence number=E2=80=9D, but it was not mentio=
ned in section<br>
&gt; 3.2.3 (related with previous comment).<br>
<br>
That&#39;s right.=C2=A0 Section 3.2.3 describes per-interface data.=C2=A0 S=
ection 3.2.4<br>
describes per-neighbour data.=C2=A0 Multicast Hellos are per-interface.<br>
Unicast Hellos are per-neighbour.<br>
<br>
&gt; Section 3.8.1.1<br>
&gt; After a node receives a route request, if the given prefix doesn=E2=80=
=99t exist in its<br>
&gt; route table, it MUST send a retraction for that prefix. So my question=
 is<br>
&gt; whether a node is allowed to send multiple explicit requests for a giv=
en<br>
&gt; prefix?<br>
<br>
There&#39;s nothing forbidding it.=C2=A0 It may send multiple requests to d=
ifferent<br>
neighbours (over unicast), or multiple requests on different interfaces<br>
(over multicast).=C2=A0 There&#39;s also nothing forbidding a node from sen=
ding<br>
multiple requests to the same destination, e.g. to compensate for packet<br=
>
loss.<br>
<br>
(Our implementation experience shows that, at least over 802.11, such<br>
aggressive behaviour is not useful, it increases noise without having<br>
a measurable effect on convergence time, hence the SHOULD in Section<br>
3.8.2.3 which only requires a single request.=C2=A0 However, further resear=
ch<br>
might yield new insights, which is why this document does not explicitly<br=
>
disallow such behaviour.)<br>
<br></blockquote><div>[YQ] thanks for the explanation. I&#39;m just wonderi=
ng whether we should document it somewhere?</div><div>=C2=A0</div><blockquo=
te class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;padding-left:1ex=
;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style=
:solid">
&gt; If so, what happens if both retractions and updates are received?<br>
<br>
The procedure described in Section 3.5.4 is run for each received update<br=
>
or retraction, which results in the construction of the data structures<br>
used as input for the precedure described in Section 3.6.<br></blockquote><=
div><br></div><div>[YQ]: got it.</div><div>=C2=A0<br></div><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;padding-left:1ex;border=
-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"=
>
&gt; 1616=C2=A0 =C2=A0 4.4.=C2=A0 Sub-TLV Format<br>
<br>
&gt; This section is about Sub-TLV, however the description language in thi=
s<br>
&gt; paragraph is mainly about TLV.<br>
<br>
Good catch, thanks.=C2=A0 I&#39;ll fix that.<br></blockquote><div>=C2=A0</d=
iv><div>[YQ]: same as comments regarding unicast hello, current text is not=
 wrong.</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width=
:1px;border-left-style:solid">
<br>
&gt; Section 4.5<br>
&gt; it says that =E2=80=9Can implementation may choose to use a dedicated =
stateless parser<br>
&gt; to parse the packet trailer=E2=80=9D. Will the packet trailer be able =
to use the state<br>
&gt; parser if there are state there useful or just for implementation purp=
ose?<br>
<br>
I do not understand this comment.=C2=A0 Please clarify.<br>
<br></blockquote><div>[YQ]: My understanding is Babel uses a stateful parse=
r, and TLVs in the packet trailer are not allowed to modify the state. So t=
he text here is suggesting to implement a stateless parser for packet trail=
er. so the question is: will packet trailer to able to use/read the state? =
is the stateless parser suggested just for implementation simplicity?</div>=
<div>=C2=A0=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0p=
x 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-=
left-width:1px;border-left-style:solid">
&gt; Although there is no packet trailer defined at this moment.<br>
<br>
Section 4.2.<br></blockquote><div>[YQ]: I meant besides the pad1 and padN, =
there is no real functional packet trailer defined at this moment, but it&#=
39;s open for extensions.</div><blockquote class=3D"gmail_quote" style=3D"m=
argin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204)=
;border-left-width:1px;border-left-style:solid">
<br>
&gt; Section 4.5<br>
&gt; 1674=C2=A0 =C2=A0 =C2=A0 =C2=A0parsing a TLV MUST update the parser st=
ate even if the TLV is<br>
&gt; 1675=C2=A0 =C2=A0 =C2=A0 =C2=A0otherwise ignored due to an unknown man=
datory sub-TLV.<br>
<br>
I believe you may have forgotten to write your comment.<br>
<br></blockquote><div>[YQ]: is it correct that the parser state is updated =
by a TLV even if the TLV is ignored due to unknown sub-tlv? what about a TL=
V ignored due to other reasons?=C2=A0</div><div><br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;padding-left:1ex;border-=
left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid">
&gt; Section 4.6.5<br>
&gt; 1805=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0send=
 a new scheduled Hello TLV with the same setting of the<br>
&gt; 1806=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Unic=
ast flag.=C2=A0 If this is 0, then this Hello represents an<br>
&gt; I=E2=80=99d suggest changing the text to =E2=80=9Cthe same setting of =
flags=E2=80=9D instead of =E2=80=9Cthe<br>
&gt; same setting of the Unicast flag=E2=80=9D, considering the flags will =
be extended later.<br>
<br>
I disagree.=C2=A0 This paragraph is about the multicast/unicast dichotomy, =
not<br>
about future flags of an informative nature.<br>
<br></blockquote><div>[YQ]: then I misunderstood it. I thought it was meant=
 to copy the entire flag field.</div><div><br></div><blockquote class=3D"gm=
ail_quote" style=3D"margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-c=
olor:rgb(204,204,204);border-left-width:1px;border-left-style:solid">
&gt; Nits:<br>
<br>
&gt; 1049=C2=A0 =C2=A0 =C2=A0 =C2=A0metric) from a neighbour neigh with a l=
ink cost value equal to cost,<br>
&gt; 1050=C2=A0 =C2=A0 =C2=A0 =C2=A0it checks whether it already has a rout=
e table entry indexed by<br>
&gt; [neighbour neigh] =3D&gt; [neighbour]<br>
<br>
I disagree.=C2=A0 We&#39;re defining the variable neigh, which we use in th=
e next<br>
sequence.<br>
<br></blockquote><div>[YQ]: it seems that this is the only place using &quo=
t;neigh&quot;, so I thought it was a typo. I would suggest some clarificati=
on.</div><div><br></div><div>=C2=A0</div><blockquote class=3D"gmail_quote" =
style=3D"margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(20=
4,204,204);border-left-width:1px;border-left-style:solid">
Regards,<br>
<br>
-- Juliusz Chroboczek<br>
</blockquote></div></div>

--0000000000000b4511058f814b11--


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From: Juliusz Chroboczek <jch@irif.fr>
To: Yingzhen Qu <yingzhen.ietf@gmail.com>
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Dear Ms. Qu,

Sorry for the delay, and thank you for your reminder.

>> The description about packet trailer is in RFC 7557 section 2.5, but
>> not included in the bis version.

>     The packet trailer is described in Section 4.2.

> [YQ]: In RFC 7557 section 2.5, there is a clear description about how the
> packet trailer length is calculated etc. Personally I feel it's more
> straightforward, but if you think section 4.2 is enough, I'm not going to
> insist.

I see.  Yes, I'll clarify that.
 
>> There are multiple places in the document about TLV/Sub-TLV being
>> “self-terminating”, but I didn’t find what it means. Maybe I’m missing
>> something here?

>     This is defined in Section 4.4.  I have checked that all uses of
>     self-terminating occur after its definition.

> [YQ]: in section 4.4, it says self-terminating can be used to determine the
> length of the TLV body without using the length field. This is clear, however
> what does it look like? how to detect it? maybe I'm missing something here.

For example, the router-id TLV is always 8 octets long.  It is
self-terminating.

The Pad1 TLV can have arbitrary length, and it is impossible to determine
its length without the explicit Length field.  It is not self-terminating.
 
>> Section 1.1
>> “unmanaged and wireless environment”, what does “unmanaged” mean here?

>     Not being actively managed by a human administrator.  This is a
>     non-normative
>     section.  Please let me know if I'm using this term badly.

> [YQ]: my understanding is unmanaged can mean anything, like no management at
> all. I don't think it's a good term, especially put together with wireless. 
> maybe try to add a bit more explanation?

This is a conceptual overview, unmanaged is used in a non-technical sense.

>> Section 3.2.3 The interface Hello seqno is changed to outing multicast
>> hello seqno, however there is no description about unicast hello at
>> all.

>     Unicast Hellos are per-neighbour, so they appear in Section 3.2.4 (Section
>     3.2.3 describes per-interface data structure while 3.2.4 describes
>     per-neighbour structures).  Both kinds of Hellos are described in more
>     detail in Section 3.4.1.

> [YQ]: there is nothing wrong with current text. I was thinking of adding
> unicast just for easy readability. same for the following three related
> questions.

The approach taken here is to define the data structures before explaining
the protocol.  The advantage is to have a clear reference for the
implementer; but of course it leads to a number of things that are not
entirely clear at this point.  It's a difficult tradeoff, I'm going to
leave it as is.

>> Section 3.8.1.1

>> After a node receives a route request, if the given prefix doesn’t
>> exist in its route table, it MUST send a retraction for that prefix. So
>> my question is whether a node is allowed to send multiple explicit
>> requests for a given prefix?

[...]

> [YQ] thanks for the explanation. I'm just wondering whether we should
> document it somewhere?

No, I don't think so.  This case is not specific -- for example, sending
multiple copies of updates is also not a good idea.
 
> [YQ]: My understanding is Babel uses a stateful parser, and TLVs in the packet
> trailer are not allowed to modify the state. So the text here is suggesting to
> implement a stateless parser for packet trailer. so the question is: will
> packet trailer to able to use/read the state? is the stateless parser suggested
> just for implementation simplicity?

None of the TLVs allowed in the packet trailer use or modify the state.
See also the last paragraph of the appendix "Considerations for protocol
extensions".
  
>> Section 4.5
>> 1674       parsing a TLV MUST update the parser state even if the TLV is
>> 1675       otherwise ignored due to an unknown mandatory sub-TLV.

>     I believe you may have forgotten to write your comment.

> [YQ]: is it correct that the parser state is updated by a TLV even if the TLV
> is ignored due to unknown sub-tlv? what about a TLV ignored due to other
> reasons?

You're right, I'll add a comment.

>> Section 4.6.5
>> 1805                 send a new scheduled Hello TLV with the same setting
>     of the
>> 1806                 Unicast flag.  If this is 0, then this Hello
>     represents an
>> I’d suggest changing the text to “the same setting of flags” instead of
>     “the
>> same setting of the Unicast flag”, considering the flags will be extended
>     later.

>     I disagree.  This paragraph is about the multicast/unicast dichotomy, not
>     about future flags of an informative nature.

> [YQ]: then I misunderstood it. I thought it was meant to copy the entire flag
> field.

>> Nits:

>> 1049       metric) from a neighbour neigh with a link cost value equal to
>     cost,
>> 1050       it checks whether it already has a route table entry indexed
>     by
>> [neighbour neigh] => [neighbour]

>     I disagree.  We're defining the variable neigh, which we use in the next
>     sequence.

> [YQ]: it seems that this is the only place using "neigh", so I thought it was a
> typo. I would suggest some clarification.

This has been removed.

-- Juliusz


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Hello,

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

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

Document: draft-ietf-pce-association-diversity-08.txt
Reviewer: Emmanuel Baccelli
Review Date: 12/08/2019
Intended Status: Standards Track

Summary of comments:

    The procotol extension is simple, and its operation is documented
pretty well.
    The document is concise, and clear from my point of view.
    See below a couple of remarks that could be considered prior to
publication.

Major Issues:

    No major issues found.

Minor Issues:

    In Section 5 (Security): If I understand correctly, dynamically adding
a new LSP to an existing disjoint association affects the (re)computation
and the (re)characterization of all LSPs in this association. In this case,
is it entirely obvious to me that there is no specific threat using the
attack vector of adding an LSP to an existing association, when flag T is
set?
What is the state of other LSPs in an existing association after another
LSP was added, which resulted in the required disjointness now fails?

Nits:

    In Section 3 (Motivation): In my opinion, this section might benefit
from being split in two: a pure motivation section, and an applicability
section.

    In Section 4.1: it is stated that "a PCE may be limited in the number
of LSPs it can take into account when computing disjointness" [...] "the
PCE may provide no path, a shortest path, or a constrained path based on
relaxing disjointness, etc.  The disjoint status is informed to the PCC."
Here, it would be useful to forward reference to section 4.6.

    In section 4.6: the spec seems to suppose that there exists an absolute
order ranking different levels of disjointness,
such that a PCE can simply take the decision to "reduce disjointness" to
the next best level.
I suspect that this is not always easy to rank in complex cases, if at all
possible.

Are some more flags foreseen (tbd in section 6.2 ?) for more fine-grained
characterization of "relaxed disjointness" in complex cases e.g. when
adding an LSP to an already-large disjoint association ?
I assume the answer is "not really".

Assuming the above, without becoming too ugly, specification could be more
explicit about ranking levels of disjointness which relaxing decisions
should be made, when flag T is unset.
Else, the spec could add a clarifying sentence on the difficulty of
ordering absolutely many different levels of disjointness for many LSPs, in
the same association.

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<div dir=3D"ltr">Hello,<br><br>I have been selected as the Routing Director=
ate reviewer for this draft. The Routing Directorate seeks to review all ro=
uting or routing-related drafts as they pass through IETF last call and IES=
G review, and sometimes on special request. The purpose of the review is to=
 provide assistance to the Routing ADs. For more information about the Rout=
ing Directorate, please see <a href=3D"http://trac.tools.ietf.org/area/rtg/=
trac/wiki/RtgDir">http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir</a><=
br><br>Although these comments are primarily for the use of the Routing ADs=
, it would be helpful if you could consider them along with any other IETF =
Last Call comments that you receive, and strive to resolve them through dis=
cussion or by updating the draft.<br><br>Document: draft-ietf-pce-associati=
on-diversity-08.txt<br>Reviewer: Emmanuel Baccelli<br>Review Date: 12/08/20=
19<br>Intended Status: Standards Track <br><br>Summary of comments:<br><br>=
=C2=A0 =C2=A0 The procotol extension is simple, and its operation is docume=
nted pretty well.<br>=C2=A0 =C2=A0 The document is concise, and clear from =
my point of view. <br>=C2=A0 =C2=A0 See below a couple of remarks that coul=
d be considered prior to publication.<br><br>Major Issues:<br><br>=C2=A0 =
=C2=A0 No major issues found.<br><br>Minor Issues:<br><br>=C2=A0 =C2=A0 In =
Section 5 (Security): If I understand correctly, dynamically adding a new L=
SP to an existing disjoint association affects the (re)computation and the =
(re)characterization of all LSPs in this association. In this case, is it e=
ntirely obvious to me that there is no specific threat using the attack vec=
tor of adding an LSP to an existing association, when flag T is set?<br>Wha=
t is the state of other LSPs in an existing association after another LSP w=
as added, which resulted in the required disjointness now fails?<br><br>Nit=
s:<br><br>=C2=A0 =C2=A0 In Section 3 (Motivation): In my opinion, this sect=
ion might benefit from being split in two: a pure motivation section, and a=
n applicability section.<br>=C2=A0 =C2=A0 <br>=C2=A0 =C2=A0 In Section 4.1:=
 it is stated that &quot;a PCE may be limited in the number of LSPs it can =
take into account when computing disjointness&quot; [...] &quot;the PCE may=
 provide no path, a shortest path, or a constrained path based on relaxing =
disjointness, etc.=C2=A0 The disjoint status is informed to the PCC.&quot; =
<br>Here, it would be useful to forward reference to section 4.6.<br><br>=
=C2=A0 =C2=A0 In section 4.6: the spec seems to suppose that there exists a=
n absolute order ranking different levels of disjointness,<br>such that a P=
CE can simply take the decision to &quot;reduce disjointness&quot; to the n=
ext best level.<br><div>I suspect that this is not always easy to rank in c=
omplex cases, if at all possible.</div><div><br></div>Are some more flags f=
oreseen (tbd in section 6.2 ?) for more fine-grained characterization of &q=
uot;relaxed disjointness&quot; in complex cases e.g. when adding an LSP to =
an already-large disjoint association ?<br><div>I assume the answer is &quo=
t;not really&quot;.</div><div><br></div>Assuming the above, without becomin=
g too ugly, specification could be more explicit about ranking levels of di=
sjointness which relaxing decisions should be made, when flag T is unset.<b=
r>Else, the spec could add a clarifying sentence on the difficulty of order=
ing absolutely many different levels of disjointness for many LSPs, in the =
same association.</div>

--00000000000068ba48058feb5d8a--


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From: Mahend Negi <mahend.ietf@gmail.com>
Date: Tue, 13 Aug 2019 20:28:38 +0530
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Cc: "<rtg-ads@ietf.org>" <rtg-ads@ietf.org>, rtg-dir@ietf.org, pce@ietf.org,  draft-ietf-pce-association-diversity.all@ietf.org
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Hi Emmanuel,

Thanks for your comments. Please see inline, do find attached reworked
draft and version-diff for reference.

On Tue, Aug 13, 2019 at 3:21 AM Emmanuel Baccelli <
Emmanuel.Baccelli@inria.fr> wrote:

> Hello,
>
> I have been selected as the Routing Directorate reviewer for this draft.
> The Routing Directorate seeks to review all routing or routing-related
> drafts as they pass through IETF last call and IESG review, and sometimes
> on special request. The purpose of the review is to provide assistance to
> the Routing ADs. For more information about the Routing Directorate, please
> see http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir
>
> Although these comments are primarily for the use of the Routing ADs, it
> would be helpful if you could consider them along with any other IETF Last
> Call comments that you receive, and strive to resolve them through
> discussion or by updating the draft.
>
> Document: draft-ietf-pce-association-diversity-08.txt
> Reviewer: Emmanuel Baccelli
> Review Date: 12/08/2019
> Intended Status: Standards Track
>
> Summary of comments:
>
>     The procotol extension is simple, and its operation is documented
> pretty well.
>     The document is concise, and clear from my point of view.
>     See below a couple of remarks that could be considered prior to
> publication.
>
> Major Issues:
>
>     No major issues found.
>
> Minor Issues:
>
>     In Section 5 (Security): If I understand correctly, dynamically adding
> a new LSP to an existing disjoint association affects the (re)computation
> and the (re)characterization of all LSPs in this association. In this case,
> is it entirely obvious to me that there is no specific threat using the
> attack vector of adding an LSP to an existing association, when flag T is
> set?
>

When T flag is set, we would have a case of no-path for the new LSP. It
would be good to also indicate that the new LSP could not be added into the
association group. I have added text for this.

What is the state of other LSPs in an existing association after another
> LSP was added, which resulted in the required disjointness now fails?
>

The other LSPs would not be impacted. So as such there is no specific
security threat with T flag. But, it would be good to add some generic
text. Updated section -

6. Security Considerations


This document defines one new type for association, which on itself does
not add any new security concerns beyond those discussed in

[RFC5440], [RFC8231] and [I-D.ietf-pce-association-group]. But, adding of a
spurious LSP into the disjointness association group

could lead to re-computation and set-up of all LSPs in the group, that
could be used to overwhelm the PCE and the network.


Also, as stated in [I-D.ietf-pce-association-group], much of the
information carried in the Disjointness Association object, as per

this document is not extra sensitive. It often reflects information that
can also be derived from the LSP Database, but association

provides a much easier grouping of related LSPs and messages. The
disjointness association could provide an adversary with the

opportunity to eavesdrop on the relationship between the LSPs. Thus
securing the PCEP session using Transport Layer Security (TLS)

[RFC8253], as per the recommendations and best current practices in
[RFC7525], is RECOMMENDED.

>


> Nits:
>
>     In Section 3 (Motivation): In my opinion, this section might benefit
> from being split in two: a pure motivation section, and an applicability
> section.
>

OK

>
>     In Section 4.1: it is stated that "a PCE may be limited in the number
> of LSPs it can take into account when computing disjointness" [...] "the
> PCE may provide no path, a shortest path, or a constrained path based on
> relaxing disjointness, etc.  The disjoint status is informed to the PCC."
> Here, it would be useful to forward reference to section 4.6.
>

OK

>
>     In section 4.6: the spec seems to suppose that there exists an
> absolute order ranking different levels of disjointness,
> such that a PCE can simply take the decision to "reduce disjointness" to
> the next best level.
> I suspect that this is not always easy to rank in complex cases, if at all
> possible.
>

Added (as it deems fit).


> Are some more flags foreseen (tbd in section 6.2 ?) for more fine-grained
> characterization of "relaxed disjointness" in complex cases e.g. when
> adding an LSP to an already-large disjoint association ?
> I assume the answer is "not really".
>
Your assumption is right.


>
> Assuming the above, without becoming too ugly, specification could be more
> explicit about ranking levels of disjointness which relaxing decisions
> should be made, when flag T is unset.
>
I think, adding "as it deems fit" is better and let implementations decide
with protocol signalling the result.


> Else, the spec could add a clarifying sentence on the difficulty of
> ordering absolutely many different levels of disjointness for many LSPs, in
> the same association.
>
Do you still feel this to be necessary? I am not too sure.


Thanks!


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

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<div dir=3D"ltr"><div dir=3D"ltr">


=09
	<span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%">Hi Emmanuel,</p>
<p style=3D"margin-bottom:0cm;line-height:100%">

</p>
<p style=3D"margin-bottom:0cm;line-height:100%">Thanks for your
comments. Please see inline, do find attached reworked draft and version-di=
ff for reference.=C2=A0<br></p>

</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">=
On Tue, Aug 13, 2019 at 3:21 AM Emmanuel Baccelli &lt;<a href=3D"mailto:Emm=
anuel.Baccelli@inria.fr">Emmanuel.Baccelli@inria.fr</a>&gt; wrote:<br></div=
><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border=
-left:1px solid rgb(204,204,204);padding-left:1ex"><div>Hello,<br><br>I hav=
e been selected as the Routing Directorate reviewer for this draft. The Rou=
ting Directorate seeks to review all routing or routing-related drafts as t=
hey pass through IETF last call and IESG review, and sometimes on special r=
equest. The purpose of the review is to provide assistance to the Routing A=
Ds. For more information about the Routing Directorate, please see <a href=
=3D"http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir" target=3D"_blank"=
>http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir</a><br><br>Although t=
hese comments are primarily for the use of the Routing ADs, it would be hel=
pful if you could consider them along with any other IETF Last Call comment=
s that you receive, and strive to resolve them through discussion or by upd=
ating the draft.<br><br>Document: draft-ietf-pce-association-diversity-08.t=
xt<br>Reviewer: Emmanuel Baccelli<br>Review Date: 12/08/2019<br>Intended St=
atus: Standards Track <br><br>Summary of comments:<br><br>=C2=A0 =C2=A0 The=
 procotol extension is simple, and its operation is documented pretty well.=
<br>=C2=A0 =C2=A0 The document is concise, and clear from my point of view.=
 <br>=C2=A0 =C2=A0 See below a couple of remarks that could be considered p=
rior to publication.<br><br>Major Issues:<br><br>=C2=A0 =C2=A0 No major iss=
ues found.<br><br>Minor Issues:<br><br>=C2=A0 =C2=A0 In Section 5 (Security=
): If I understand correctly, dynamically adding a new LSP to an existing d=
isjoint association affects the (re)computation and the (re)characterizatio=
n of all LSPs in this association. In this case, is it entirely obvious to =
me that there is no specific threat using the attack vector of adding an LS=
P to an existing association, when flag T is set?</div></blockquote><div>=
=C2=A0</div><div>When T flag is set,
we would have a case of no-path for the new LSP. It would be good to
also indicate that the new LSP could not be added into the association
group. I have added text for this.</div><div><br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(2=
04,204,204);padding-left:1ex"><div dir=3D"ltr">What is the state of other L=
SPs in an existing association after another LSP was added, which resulted =
in the required disjointness now fails?<br></div></blockquote><div>=C2=A0<b=
r></div><div>The other LSPs would
not be impacted. So as such there is
no specific security threat with T flag. But, it would be
good to add some generic text. Updated section -</div><div>


=09
	<span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%">6.  Security
Considerations</p>
<p style=3D"margin-bottom:0cm;line-height:100%"><br>

</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   This document
defines one new type for association, which on itself does not add any
new security concerns beyond those discussed in</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   [RFC5440],
[RFC8231] and [I-D.ietf-pce-association-group].  But, adding of a
spurious LSP into the disjointness association group</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   could lead to
re-computation and set-up of all LSPs in the group, that could be
used to overwhelm the PCE and the network.</p>
<p style=3D"margin-bottom:0cm;line-height:100%">

</p>
<p style=3D"margin-bottom:0cm;line-height:100%"><br></p><p style=3D"margin-=
bottom:0cm;line-height:100%">   Also, as stated
in [I-D.ietf-pce-association-group], much of the information
carried in the Disjointness Association object, as per</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   this document is
not extra sensitive.  It often reflects information that can also be
derived from the LSP Database, but association</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   provides a much
easier grouping of related LSPs and messages.  The disjointness
association could provide an adversary with the</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   opportunity to
eavesdrop on the relationship between the LSPs. Thus securing the
PCEP session using Transport Layer Security (TLS)</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   [RFC8253], as per
the recommendations and best current practices in [RFC7525], is
RECOMMENDED.</p>

</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">

</div></blockquote><div>


=09
	<span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%"><br></p>=C2=A0

<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr=
">Nits:<br><br>=C2=A0 =C2=A0 In Section 3 (Motivation): In my opinion, this=
 section might benefit from being split in two: a pure motivation section, =
and an applicability section.<br></div></blockquote><div>=C2=A0</div><div>O=
K <br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"l=
tr">=C2=A0 =C2=A0 <br>=C2=A0 =C2=A0 In Section 4.1: it is stated that &quot=
;a PCE may be limited in the number of LSPs it can take into account when c=
omputing disjointness&quot; [...] &quot;the PCE may provide no path, a shor=
test path, or a constrained path based on relaxing disjointness, etc.=C2=A0=
 The disjoint status is informed to the PCC.&quot; <br>Here, it would be us=
eful to forward reference to section 4.6.<br></div></blockquote><div>=C2=A0=
</div><div>OK <br></div><blockquote class=3D"gmail_quote" style=3D"margin:0=
px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><=
div dir=3D"ltr"><br>=C2=A0 =C2=A0 In section 4.6: the spec seems to suppose=
 that there exists an absolute order ranking different levels of disjointne=
ss,<br>such that a PCE can simply take the decision to &quot;reduce disjoin=
tness&quot; to the next best level.<br><div>I suspect that this is not alwa=
ys easy to rank in complex cases, if at all possible.</div></div></blockquo=
te><div><br></div><div>


=09
	<span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%">Added (as it deems
fit).</p>=C2=A0

</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">Ar=
e some more flags foreseen (tbd in section 6.2 ?) for more fine-grained cha=
racterization of &quot;relaxed disjointness&quot; in complex cases e.g. whe=
n adding an LSP to an already-large disjoint association ?<br><div>I assume=
 the answer is &quot;not really&quot;.</div></div></blockquote><div>


=09
	<span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%">Your assumption is
right.</p>=C2=A0

<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr=
"><div><br></div>Assuming the above, without becoming too ugly, specificati=
on could be more explicit about ranking levels of disjointness which relaxi=
ng decisions should be made, when flag T is unset.<br></div></blockquote><d=
iv>


=09
	<span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%">I think, adding &quot;as
it deems fit&quot; is better and let implementations decide with protocol
signalling the result.</p>=C2=A0

<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr=
">Else, the spec could add a clarifying sentence on the difficulty of order=
ing absolutely many different levels of disjointness for many LSPs, in the =
same association.</div></blockquote><div><span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%">Do you still feel
this to be necessary? I am not too sure.</p>
<p style=3D"margin-bottom:0cm;line-height:100%"><br>

</p>
<p style=3D"margin-bottom:0cm;line-height:100%">Thanks!</p><p style=3D"marg=
in-bottom:0cm;line-height:100%"><br></p>

</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex">
_______________________________________________<br>
Pce mailing list<br>
<a href=3D"mailto:Pce@ietf.org" target=3D"_blank">Pce@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/pce" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/pce</a><br>
</blockquote></div></div>

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From nobody Wed Aug 21 12:05:21 2019
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From: Loa Andersson <loa@pi.nu>
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Subject: [RTG-DIR] RtgDir review: draft-ietf-teas-native-ip-scenarios-06
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Hello,

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

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

Document: draft-ietf-teas-native-ip-scenarios-06
Reviewer: Loa Andersson
Review Date: date
IETF LC End Date: -
Intended Status: Informational



I have some minor concerns about this document that I think should be 
resolved before publication.
The concerns might in some cases be considered to be nits.

Comments:

The document describes scenarios in which CCDR, a technology that
combines the advantages or distributed and centralized control, could be
deployed.
The document also report on testing that has been performed with this
technology.

Major Issues:
No major issues found.

This a very interesting and valuable document that should be progressed 
to RFC.
It is refreshing to see an attempt to take advantage of distributed and 
centralized
control technologies and merge them together to a single whole.

Minor Issues:


I found the document well worth reading and think about, I also found
it somewhat hard to read, most of this probably depends on my
lack of expertise in the area.

However:

- I would consider doing a English language review, I don't think there
   is anything wrong, but the language is sometimes a bit heavy.
   Sometimes the choice of word could be discussed, in a specification
   I would rather expect "advantage" rather than "merit".

- I'd like to see exactly which specification that has been tested early
   in the document, preferably in the Introduction.

- I would expand the Abstract with one or two paragraphs.
   When I worked for larger companies, I used to say that the abstract
   should be written such that my immediate manager could read it and
   understand what it is all about.

   Since the abstract is supposed to self-contained and separable from
   the RFC (see RFC 7997) abbreviations in the abstract is to be avoided
   (or expanded).

- Abbreviations
   The RFC Editor Abbreviations list
   (https://www.rfc-editor.org/materials/abbrev.expansion.txt)
   gives a good idea on the rules that applies to abbreviations in RFCs.
   The basic rule is that an abbreviation is expanded the first time
   it is used.
   In this document there are abbreviations, for example in figures, that
   is not expanded, e.g. CR, SR, BRAS and IDC

  - I also have a small concern about listing "alternative" technologies
    (MPLS-TE, SR and DETNET) in the introduction, it is hard to come away
    without the impression that these technologies are seen as
    insufficient.
    Admittedly they do not solve the problem that CCDR solves, but they
    are well suited to solve the problem they were designed for.

Nits:

I'm unclear about nits vs. minor concerns for this document, and listed
everything as minor concerns.

/Loa

PS
I'm sorry that this review has been delayed.
-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


From nobody Sun Aug 25 20:28:23 2019
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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: "'Loa Andersson'" <loa@pi.nu>, <rtg-ads@ietf.org>
Cc: <rtg-dir@ietf.org>, <draft-ietf-teas-native-ip-scenarios.all@ietf.org>, "'TEAS WG'" <teas@ietf.org>
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Hi, Loa:

Thanks for your review. We have updated the draft according to your =
comments.
The detail responses for your comments are inline below.


Best Regards.

Aijun Wang
China Telecom

-----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
=E5=8F=91=E4=BB=B6=E4=BA=BA: teas-bounces@ietf.org =
[mailto:teas-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Loa Andersson
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2019=E5=B9=B48=E6=9C=8822=E6=97=A5 =
3:05
=E6=94=B6=E4=BB=B6=E4=BA=BA: <rtg-ads@ietf.org>
=E6=8A=84=E9=80=81: rtg-dir@ietf.org; =
draft-ietf-teas-native-ip-scenarios.all@ietf.org; TEAS WG
=E4=B8=BB=E9=A2=98: [Teas] RtgDir review: =
draft-ietf-teas-native-ip-scenarios-06

Hello,

I have been selected as the Routing Directorate reviewer for this draft. =

The Routing Directorate seeks to review all routing or routing-related =
drafts as they pass through IETF last call and IESG review, and =
sometimes on special request. The purpose of the review is to provide =
assistance to the Routing ADs. For more information about the Routing =
Directorate, please see =
=E2=80=8Bhttp://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir

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

Document: draft-ietf-teas-native-ip-scenarios-06
Reviewer: Loa Andersson
Review Date: date
IETF LC End Date: -
Intended Status: Informational



I have some minor concerns about this document that I think should be =
resolved before publication.
The concerns might in some cases be considered to be nits.

Comments:

The document describes scenarios in which CCDR, a technology that =
combines the advantages or distributed and centralized control, could be =
deployed.
The document also report on testing that has been performed with this =
technology.

Major Issues:
No major issues found.

This a very interesting and valuable document that should be progressed =
to RFC.
It is refreshing to see an attempt to take advantage of distributed and =
centralized control technologies and merge them together to a single =
whole.

Minor Issues:


I found the document well worth reading and think about, I also found it =
somewhat hard to read, most of this probably depends on my lack of =
expertise in the area.

However:

- I would consider doing a English language review, I don't think there
   is anything wrong, but the language is sometimes a bit heavy.
   Sometimes the choice of word could be discussed, in a specification
   I would rather expect "advantage" rather than "merit".
=E3=80=90Aijun Wang=E3=80=91: Have done some changes. We are also =
seeking one Native English speaker to polish it again. =20

- I'd like to see exactly which specification that has been tested early
   in the document, preferably in the Introduction.
=E3=80=90Aijun Wang=E3=80=91: Add some sentences for the application of =
existing technologies.

- I would expand the Abstract with one or two paragraphs.
   When I worked for larger companies, I used to say that the abstract
   should be written such that my immediate manager could read it and
   understand what it is all about.

   Since the abstract is supposed to self-contained and separable from
   the RFC (see RFC 7997) abbreviations in the abstract is to be avoided
   (or expanded).
=E3=80=90Aijun Wang=E3=80=91: Done

- Abbreviations
   The RFC Editor Abbreviations list
   (https://www.rfc-editor.org/materials/abbrev.expansion.txt)
   gives a good idea on the rules that applies to abbreviations in RFCs.
   The basic rule is that an abbreviation is expanded the first time
   it is used.
   In this document there are abbreviations, for example in figures, =
that
   is not expanded, e.g. CR, SR, BRAS and IDC

  - I also have a small concern about listing "alternative" technologies
    (MPLS-TE, SR and DETNET) in the introduction, it is hard to come =
away
    without the impression that these technologies are seen as
    insufficient.
    Admittedly they do not solve the problem that CCDR solves, but they
    are well suited to solve the problem they were designed for.
=E3=80=90Aijun Wang=E3=80=91: Have done some changes. Point out mainly =
that the alternative technologies are not suitable for the Native IP =
scenarios that described in this draft. This is the main motivation for =
us to introduce the solution that described in =
https://datatracker.ietf.org/doc/draft-ietf-teas-pce-native-ip/ and =
https://datatracker.ietf.org/doc/draft-ietf-pce-pcep-extension-native-ip/=


Nits:

I'm unclear about nits vs. minor concerns for this document, and listed =
everything as minor concerns.

/Loa

PS
I'm sorry that this review has been delayed.
--=20


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64

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


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From: Emmanuel Baccelli <Emmanuel.Baccelli@inria.fr>
Date: Mon, 26 Aug 2019 12:39:21 +0200
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Dear Mahend

thanks for you answers. Your changes look fine to me.

Two last nits:

- in the sentence you added in section 5.6 when the T flag is set, "In case
of other PCEP message, the PCE MUST return a PCErr message with Error-Type
26".
=> PCEP message other than what? This is not crystal clear. I suggest you
clarify explicitly.

- in the sentence you added in section 5.6 when the T flag is unset, "the
PCE is allowed to relax disjointness by either applying a requested
objective function (Section 5.4) if specified.  Otherwise the PCE is
allowed to reduce the required level   of disjointness (as it deems fit)"
=> as-is, there seems to be a typo: a spurious "either". How about:

"the PCE is allowed to relax disjointness by applying a requested objective
function (Section 5.4) if specified. Otherwise, if no objective function is
specified, the PCE is allowed to reduce the required level of disjointness
as it deems fit"

Cheers

Emmanuel

On Tue, Aug 13, 2019 at 4:58 PM Mahend Negi <mahend.ietf@gmail.com> wrote:

> Hi Emmanuel,
>
> Thanks for your comments. Please see inline, do find attached reworked
> draft and version-diff for reference.
>
> On Tue, Aug 13, 2019 at 3:21 AM Emmanuel Baccelli <
> Emmanuel.Baccelli@inria.fr> wrote:
>
>> Hello,
>>
>> I have been selected as the Routing Directorate reviewer for this draft.
>> The Routing Directorate seeks to review all routing or routing-related
>> drafts as they pass through IETF last call and IESG review, and sometimes
>> on special request. The purpose of the review is to provide assistance to
>> the Routing ADs. For more information about the Routing Directorate, please
>> see http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir
>>
>> Although these comments are primarily for the use of the Routing ADs, it
>> would be helpful if you could consider them along with any other IETF Last
>> Call comments that you receive, and strive to resolve them through
>> discussion or by updating the draft.
>>
>> Document: draft-ietf-pce-association-diversity-08.txt
>> Reviewer: Emmanuel Baccelli
>> Review Date: 12/08/2019
>> Intended Status: Standards Track
>>
>> Summary of comments:
>>
>>     The procotol extension is simple, and its operation is documented
>> pretty well.
>>     The document is concise, and clear from my point of view.
>>     See below a couple of remarks that could be considered prior to
>> publication.
>>
>> Major Issues:
>>
>>     No major issues found.
>>
>> Minor Issues:
>>
>>     In Section 5 (Security): If I understand correctly, dynamically
>> adding a new LSP to an existing disjoint association affects the
>> (re)computation and the (re)characterization of all LSPs in this
>> association. In this case, is it entirely obvious to me that there is no
>> specific threat using the attack vector of adding an LSP to an existing
>> association, when flag T is set?
>>
>
> When T flag is set, we would have a case of no-path for the new LSP. It
> would be good to also indicate that the new LSP could not be added into the
> association group. I have added text for this.
>
> What is the state of other LSPs in an existing association after another
>> LSP was added, which resulted in the required disjointness now fails?
>>
>
> The other LSPs would not be impacted. So as such there is no specific
> security threat with T flag. But, it would be good to add some generic
> text. Updated section -
>
> 6. Security Considerations
>
>
> This document defines one new type for association, which on itself does
> not add any new security concerns beyond those discussed in
>
> [RFC5440], [RFC8231] and [I-D.ietf-pce-association-group]. But, adding of
> a spurious LSP into the disjointness association group
>
> could lead to re-computation and set-up of all LSPs in the group, that
> could be used to overwhelm the PCE and the network.
>
>
> Also, as stated in [I-D.ietf-pce-association-group], much of the
> information carried in the Disjointness Association object, as per
>
> this document is not extra sensitive. It often reflects information that
> can also be derived from the LSP Database, but association
>
> provides a much easier grouping of related LSPs and messages. The
> disjointness association could provide an adversary with the
>
> opportunity to eavesdrop on the relationship between the LSPs. Thus
> securing the PCEP session using Transport Layer Security (TLS)
>
> [RFC8253], as per the recommendations and best current practices in
> [RFC7525], is RECOMMENDED.
>
>>
>
>
>> Nits:
>>
>>     In Section 3 (Motivation): In my opinion, this section might benefit
>> from being split in two: a pure motivation section, and an applicability
>> section.
>>
>
> OK
>
>>
>>     In Section 4.1: it is stated that "a PCE may be limited in the number
>> of LSPs it can take into account when computing disjointness" [...] "the
>> PCE may provide no path, a shortest path, or a constrained path based on
>> relaxing disjointness, etc.  The disjoint status is informed to the PCC."
>> Here, it would be useful to forward reference to section 4.6.
>>
>
> OK
>
>>
>>     In section 4.6: the spec seems to suppose that there exists an
>> absolute order ranking different levels of disjointness,
>> such that a PCE can simply take the decision to "reduce disjointness" to
>> the next best level.
>> I suspect that this is not always easy to rank in complex cases, if at
>> all possible.
>>
>
> Added (as it deems fit).
>
>
>> Are some more flags foreseen (tbd in section 6.2 ?) for more fine-grained
>> characterization of "relaxed disjointness" in complex cases e.g. when
>> adding an LSP to an already-large disjoint association ?
>> I assume the answer is "not really".
>>
> Your assumption is right.
>
>
>>
>> Assuming the above, without becoming too ugly, specification could be
>> more explicit about ranking levels of disjointness which relaxing decisions
>> should be made, when flag T is unset.
>>
> I think, adding "as it deems fit" is better and let implementations decide
> with protocol signalling the result.
>
>
>> Else, the spec could add a clarifying sentence on the difficulty of
>> ordering absolutely many different levels of disjointness for many LSPs, in
>> the same association.
>>
> Do you still feel this to be necessary? I am not too sure.
>
>
> Thanks!
>
>
> _______________________________________________
>> Pce mailing list
>> Pce@ietf.org
>> https://www.ietf.org/mailman/listinfo/pce
>>
>

--00000000000085bca1059102c567
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Dear Mahend</div><div><br></div><div>thanks for you a=
nswers. Your changes look fine to me.</div><div><br></div><div>Two last nit=
s:</div><div><br></div><div>- in the sentence  you added in section 5.6 whe=
n the T flag is set, &quot;In case of other PCEP message, the PCE MUST retu=
rn a PCErr message with Error-Type 26&quot;.</div><div>=3D&gt; PCEP message=
 other than what? This is not crystal clear. I suggest you clarify explicit=
ly.<br></div><div><br></div><div>- in the sentence you added in section 5.6=
 when the T flag is unset, &quot;the PCE is allowed to relax disjointness b=
y either applying a requested objective function (Section 5.4) if specified=
.=C2=A0 Otherwise the PCE is allowed to reduce the required level =C2=A0 of=
 disjointness (as it deems fit)&quot;<br></div><div>=3D&gt; as-is, there se=
ems to be a typo: a spurious &quot;either&quot;. How about:</div><div><br><=
/div><div>&quot;the PCE is allowed to relax disjointness by applying a requ=
ested objective function (Section 5.4) if specified. Otherwise, if no objec=
tive function is specified, the PCE is allowed to reduce the required level=
 of disjointness as it deems fit&quot;</div><div><br></div><div>Cheers</div=
><div><br></div><div>Emmanuel<br></div></div><br><div class=3D"gmail_quote"=
><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Aug 13, 2019 at 4:58 PM Mahe=
nd Negi &lt;<a href=3D"mailto:mahend.ietf@gmail.com">mahend.ietf@gmail.com<=
/a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0=
px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><=
div dir=3D"ltr"><div dir=3D"ltr">


=09
	<span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%">Hi Emmanuel,</p>
<p style=3D"margin-bottom:0cm;line-height:100%">

</p>
<p style=3D"margin-bottom:0cm;line-height:100%">Thanks for your
comments. Please see inline, do find attached reworked draft and version-di=
ff for reference.=C2=A0<br></p>

</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">=
On Tue, Aug 13, 2019 at 3:21 AM Emmanuel Baccelli &lt;<a href=3D"mailto:Emm=
anuel.Baccelli@inria.fr" target=3D"_blank">Emmanuel.Baccelli@inria.fr</a>&g=
t; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0p=
x 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>H=
ello,<br><br>I have been selected as the Routing Directorate reviewer for t=
his draft. The Routing Directorate seeks to review all routing or routing-r=
elated drafts as they pass through IETF last call and IESG review, and some=
times on special request. The purpose of the review is to provide assistanc=
e to the Routing ADs. For more information about the Routing Directorate, p=
lease see <a href=3D"http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir" =
target=3D"_blank">http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir</a><=
br><br>Although these comments are primarily for the use of the Routing ADs=
, it would be helpful if you could consider them along with any other IETF =
Last Call comments that you receive, and strive to resolve them through dis=
cussion or by updating the draft.<br><br>Document: draft-ietf-pce-associati=
on-diversity-08.txt<br>Reviewer: Emmanuel Baccelli<br>Review Date: 12/08/20=
19<br>Intended Status: Standards Track <br><br>Summary of comments:<br><br>=
=C2=A0 =C2=A0 The procotol extension is simple, and its operation is docume=
nted pretty well.<br>=C2=A0 =C2=A0 The document is concise, and clear from =
my point of view. <br>=C2=A0 =C2=A0 See below a couple of remarks that coul=
d be considered prior to publication.<br><br>Major Issues:<br><br>=C2=A0 =
=C2=A0 No major issues found.<br><br>Minor Issues:<br><br>=C2=A0 =C2=A0 In =
Section 5 (Security): If I understand correctly, dynamically adding a new L=
SP to an existing disjoint association affects the (re)computation and the =
(re)characterization of all LSPs in this association. In this case, is it e=
ntirely obvious to me that there is no specific threat using the attack vec=
tor of adding an LSP to an existing association, when flag T is set?</div><=
/blockquote><div>=C2=A0</div><div>When T flag is set,
we would have a case of no-path for the new LSP. It would be good to
also indicate that the new LSP could not be added into the association
group. I have added text for this.</div><div><br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(2=
04,204,204);padding-left:1ex"><div dir=3D"ltr">What is the state of other L=
SPs in an existing association after another LSP was added, which resulted =
in the required disjointness now fails?<br></div></blockquote><div>=C2=A0<b=
r></div><div>The other LSPs would
not be impacted. So as such there is
no specific security threat with T flag. But, it would be
good to add some generic text. Updated section -</div><div>


=09
	<span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%">6.  Security
Considerations</p>
<p style=3D"margin-bottom:0cm;line-height:100%"><br>

</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   This document
defines one new type for association, which on itself does not add any
new security concerns beyond those discussed in</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   [RFC5440],
[RFC8231] and [I-D.ietf-pce-association-group].  But, adding of a
spurious LSP into the disjointness association group</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   could lead to
re-computation and set-up of all LSPs in the group, that could be
used to overwhelm the PCE and the network.</p>
<p style=3D"margin-bottom:0cm;line-height:100%">

</p>
<p style=3D"margin-bottom:0cm;line-height:100%"><br></p><p style=3D"margin-=
bottom:0cm;line-height:100%">   Also, as stated
in [I-D.ietf-pce-association-group], much of the information
carried in the Disjointness Association object, as per</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   this document is
not extra sensitive.  It often reflects information that can also be
derived from the LSP Database, but association</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   provides a much
easier grouping of related LSPs and messages.  The disjointness
association could provide an adversary with the</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   opportunity to
eavesdrop on the relationship between the LSPs. Thus securing the
PCEP session using Transport Layer Security (TLS)</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   [RFC8253], as per
the recommendations and best current practices in [RFC7525], is
RECOMMENDED.</p>

</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">

</div></blockquote><div>


=09
	<span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%"><br></p>=C2=A0

<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr=
">Nits:<br><br>=C2=A0 =C2=A0 In Section 3 (Motivation): In my opinion, this=
 section might benefit from being split in two: a pure motivation section, =
and an applicability section.<br></div></blockquote><div>=C2=A0</div><div>O=
K <br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"l=
tr">=C2=A0 =C2=A0 <br>=C2=A0 =C2=A0 In Section 4.1: it is stated that &quot=
;a PCE may be limited in the number of LSPs it can take into account when c=
omputing disjointness&quot; [...] &quot;the PCE may provide no path, a shor=
test path, or a constrained path based on relaxing disjointness, etc.=C2=A0=
 The disjoint status is informed to the PCC.&quot; <br>Here, it would be us=
eful to forward reference to section 4.6.<br></div></blockquote><div>=C2=A0=
</div><div>OK <br></div><blockquote class=3D"gmail_quote" style=3D"margin:0=
px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><=
div dir=3D"ltr"><br>=C2=A0 =C2=A0 In section 4.6: the spec seems to suppose=
 that there exists an absolute order ranking different levels of disjointne=
ss,<br>such that a PCE can simply take the decision to &quot;reduce disjoin=
tness&quot; to the next best level.<br><div>I suspect that this is not alwa=
ys easy to rank in complex cases, if at all possible.</div></div></blockquo=
te><div><br></div><div>


=09
	<span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%">Added (as it deems
fit).</p>=C2=A0

</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">Ar=
e some more flags foreseen (tbd in section 6.2 ?) for more fine-grained cha=
racterization of &quot;relaxed disjointness&quot; in complex cases e.g. whe=
n adding an LSP to an already-large disjoint association ?<br><div>I assume=
 the answer is &quot;not really&quot;.</div></div></blockquote><div>


=09
	<span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%">Your assumption is
right.</p>=C2=A0

<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr=
"><div><br></div>Assuming the above, without becoming too ugly, specificati=
on could be more explicit about ranking levels of disjointness which relaxi=
ng decisions should be made, when flag T is unset.<br></div></blockquote><d=
iv>


=09
	<span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%">I think, adding &quot;as
it deems fit&quot; is better and let implementations decide with protocol
signalling the result.</p>=C2=A0

<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr=
">Else, the spec could add a clarifying sentence on the difficulty of order=
ing absolutely many different levels of disjointness for many LSPs, in the =
same association.</div></blockquote><div><span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%">Do you still feel
this to be necessary? I am not too sure.</p>
<p style=3D"margin-bottom:0cm;line-height:100%"><br>

</p>
<p style=3D"margin-bottom:0cm;line-height:100%">Thanks!</p><p style=3D"marg=
in-bottom:0cm;line-height:100%"><br></p>

</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex">
_______________________________________________<br>
Pce mailing list<br>
<a href=3D"mailto:Pce@ietf.org" target=3D"_blank">Pce@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/pce" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/pce</a><br>
</blockquote></div></div>
</blockquote></div>

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Subject: [RTG-DIR] RtgDir Review: Restart Signaling for IS-IS
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--000000000000951fd005910844b6
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Hello,

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

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

Document: draft-ietf-lsr-isis-rfc5306bis-05
Reviewer: Manav Bhatia
Review Date: 27 Aug 2019
IETF LC End Date: date-if-known
Intended Status: Standards Track

Summary:

No issues found. This document is ready for publication.

Comments:

I had reviewed this document earlier and my comments had been incorporated
back then.

Major Issues:
No major issues found.

Minor Issues:
No minor issues found.

Cheers, Manav

--000000000000951fd005910844b6
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hello,<br><br>I have been selected as the Routing Director=
ate reviewer for this draft. The Routing Directorate seeks to review all ro=
uting or routing-related drafts as they pass through IETF last call and IES=
G review, and sometimes on special request. The purpose of the review is to=
 provide assistance to the Routing ADs. For more information about the Rout=
ing Directorate, please see <a href=3D"http://trac.tools.ietf.org/area/rtg/=
trac/wiki/RtgDir">http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir</a><=
br><br>Although these comments are primarily for the use of the Routing ADs=
, it would be helpful if you could consider them along with any other IETF =
Last Call comments that you receive, and strive to resolve them through dis=
cussion or by updating the draft.<br><br>Document: draft-ietf-lsr-isis-rfc5=
306bis-05<br>Reviewer: Manav Bhatia<br>Review Date: 27 Aug 2019<br>IETF LC =
End Date: date-if-known<br>Intended Status: Standards Track<br><br>Summary:=
<div><br>No issues found. This document is ready for publication.<br><br>Co=
mments:<br><br>I had reviewed this document earlier and my comments had bee=
n incorporated back then.</div><div><br>Major Issues:<br>No major issues fo=
und.<br><br>Minor Issues:<br>No minor issues found.<br><br>Cheers, Manav</d=
iv></div>

--000000000000951fd005910844b6--


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Manav Bhatia <manavbhatia@gmail.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "rtg-ads@tools.ietf.org" <rtg-ads@tools.ietf.org>, "draft-ietf-lsr-isis-rfc5306bis.all@ietf.org" <draft-ietf-lsr-isis-rfc5306bis.all@ietf.org>
Thread-Topic: [RTG-DIR] RtgDir Review: Restart Signaling for IS-IS
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Date: Mon, 26 Aug 2019 19:09:11 +0000
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Subject: Re: [RTG-DIR] RtgDir Review: Restart Signaling for IS-IS
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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Tue, 27 Aug 2019 16:26:34 +0530
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To: Emmanuel Baccelli <Emmanuel.Baccelli@inria.fr>
Cc: draft-ietf-pce-association-diversity.all@ietf.org,  "<rtg-ads@ietf.org>" <rtg-ads@ietf.org>, rtg-dir@ietf.org, pce@ietf.org
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Subject: Re: [RTG-DIR] [Pce] RtgDir review: draft-ietf-pce-association-diversity-08.txt
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Hi Emmanuel,

Thanks for you review, the last two nits seems reasonable to me.

Regards,
Dhruv

On Mon, Aug 26, 2019 at 4:09 PM Emmanuel Baccelli
<Emmanuel.Baccelli@inria.fr> wrote:
>
> Dear Mahend
>
> thanks for you answers. Your changes look fine to me.
>
> Two last nits:
>
> - in the sentence you added in section 5.6 when the T flag is set, "In ca=
se of other PCEP message, the PCE MUST return a PCErr message with Error-Ty=
pe 26".
> =3D> PCEP message other than what? This is not crystal clear. I suggest y=
ou clarify explicitly.
>
> - in the sentence you added in section 5.6 when the T flag is unset, "the=
 PCE is allowed to relax disjointness by either applying a requested object=
ive function (Section 5.4) if specified.  Otherwise the PCE is allowed to r=
educe the required level   of disjointness (as it deems fit)"
> =3D> as-is, there seems to be a typo: a spurious "either". How about:
>
> "the PCE is allowed to relax disjointness by applying a requested objecti=
ve function (Section 5.4) if specified. Otherwise, if no objective function=
 is specified, the PCE is allowed to reduce the required level of disjointn=
ess as it deems fit"
>
> Cheers
>
> Emmanuel
>
> On Tue, Aug 13, 2019 at 4:58 PM Mahend Negi <mahend.ietf@gmail.com> wrote=
:
>>
>> Hi Emmanuel,
>>
>> Thanks for your comments. Please see inline, do find attached reworked d=
raft and version-diff for reference.
>>
>>
>> On Tue, Aug 13, 2019 at 3:21 AM Emmanuel Baccelli <Emmanuel.Baccelli@inr=
ia.fr> wrote:
>>>
>>> Hello,
>>>
>>> I have been selected as the Routing Directorate reviewer for this draft=
. The Routing Directorate seeks to review all routing or routing-related dr=
afts as they pass through IETF last call and IESG review, and sometimes on =
special request. The purpose of the review is to provide assistance to the =
Routing ADs. For more information about the Routing Directorate, please see=
 http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir
>>>
>>> Although these comments are primarily for the use of the Routing ADs, i=
t would be helpful if you could consider them along with any other IETF Las=
t Call comments that you receive, and strive to resolve them through discus=
sion or by updating the draft.
>>>
>>> Document: draft-ietf-pce-association-diversity-08.txt
>>> Reviewer: Emmanuel Baccelli
>>> Review Date: 12/08/2019
>>> Intended Status: Standards Track
>>>
>>> Summary of comments:
>>>
>>>     The procotol extension is simple, and its operation is documented p=
retty well.
>>>     The document is concise, and clear from my point of view.
>>>     See below a couple of remarks that could be considered prior to pub=
lication.
>>>
>>> Major Issues:
>>>
>>>     No major issues found.
>>>
>>> Minor Issues:
>>>
>>>     In Section 5 (Security): If I understand correctly, dynamically add=
ing a new LSP to an existing disjoint association affects the (re)computati=
on and the (re)characterization of all LSPs in this association. In this ca=
se, is it entirely obvious to me that there is no specific threat using the=
 attack vector of adding an LSP to an existing association, when flag T is =
set?
>>
>>
>> When T flag is set, we would have a case of no-path for the new LSP. It =
would be good to also indicate that the new LSP could not be added into the=
 association group. I have added text for this.
>>
>>> What is the state of other LSPs in an existing association after anothe=
r LSP was added, which resulted in the required disjointness now fails?
>>
>>
>> The other LSPs would not be impacted. So as such there is no specific se=
curity threat with T flag. But, it would be good to add some generic text. =
Updated section -
>>
>> 6. Security Considerations
>>
>>
>> This document defines one new type for association, which on itself does=
 not add any new security concerns beyond those discussed in
>>
>> [RFC5440], [RFC8231] and [I-D.ietf-pce-association-group]. But, adding o=
f a spurious LSP into the disjointness association group
>>
>> could lead to re-computation and set-up of all LSPs in the group, that c=
ould be used to overwhelm the PCE and the network.
>>
>>
>> Also, as stated in [I-D.ietf-pce-association-group], much of the informa=
tion carried in the Disjointness Association object, as per
>>
>> this document is not extra sensitive. It often reflects information that=
 can also be derived from the LSP Database, but association
>>
>> provides a much easier grouping of related LSPs and messages. The disjoi=
ntness association could provide an adversary with the
>>
>> opportunity to eavesdrop on the relationship between the LSPs. Thus secu=
ring the PCEP session using Transport Layer Security (TLS)
>>
>> [RFC8253], as per the recommendations and best current practices in [RFC=
7525], is RECOMMENDED.
>>
>>
>>
>>>
>>> Nits:
>>>
>>>     In Section 3 (Motivation): In my opinion, this section might benefi=
t from being split in two: a pure motivation section, and an applicability =
section.
>>
>>
>> OK
>>>
>>>
>>>     In Section 4.1: it is stated that "a PCE may be limited in the numb=
er of LSPs it can take into account when computing disjointness" [...] "the=
 PCE may provide no path, a shortest path, or a constrained path based on r=
elaxing disjointness, etc.  The disjoint status is informed to the PCC."
>>> Here, it would be useful to forward reference to section 4.6.
>>
>>
>> OK
>>>
>>>
>>>     In section 4.6: the spec seems to suppose that there exists an abso=
lute order ranking different levels of disjointness,
>>> such that a PCE can simply take the decision to "reduce disjointness" t=
o the next best level.
>>> I suspect that this is not always easy to rank in complex cases, if at =
all possible.
>>
>>
>> Added (as it deems fit).
>>
>>
>>>
>>> Are some more flags foreseen (tbd in section 6.2 ?) for more fine-grain=
ed characterization of "relaxed disjointness" in complex cases e.g. when ad=
ding an LSP to an already-large disjoint association ?
>>> I assume the answer is "not really".
>>
>> Your assumption is right.
>>
>>
>>>
>>>
>>> Assuming the above, without becoming too ugly, specification could be m=
ore explicit about ranking levels of disjointness which relaxing decisions =
should be made, when flag T is unset.
>>
>> I think, adding "as it deems fit" is better and let implementations deci=
de with protocol signalling the result.
>>
>>
>>>
>>> Else, the spec could add a clarifying sentence on the difficulty of ord=
ering absolutely many different levels of disjointness for many LSPs, in th=
e same association.
>>
>> Do you still feel this to be necessary? I am not too sure.
>>
>>
>> Thanks!
>>
>>
>>> _______________________________________________
>>> Pce mailing list
>>> Pce@ietf.org
>>> https://www.ietf.org/mailman/listinfo/pce


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Reviewer: Susan Hares
Review result: Has Nits

Authors: Thank you for continuing to refine this document.  
Status: editorial nits:  

#1 - Section 3.3 paragraph 1, last sentence 
old/RMR is primarly intended for operation at the packet layer; 
       however, parallel links at hte lambda or fiber layer result in 
      parallel links at the packet layer./

question:  Did you want to say /may result/ intead of /result/

#2 - Section 3.7 - Would be easier to read if you included a diagram.
#3 - Section 4.4 - Would be easier to read if you included a diagram

Rational for requesting diagram: You are explaining the technology
that requires additional TLVs in other protocols (IGPS)

#4 - Section 5 - (editorial only)  This one section jars the reader 
to ask "why am I bothered with this section."   

I understand why you want to make this clear that this point. 
However, in section 1 you lay out the protocols. Do you also want to 
do this here?   Either choice works technically.  However this 
document is dually focused: summary of RMR concepts to 
those writing future specifications and RMR to those
desiring to install these solutions.   Does this section help 
those desiring to install these solutions to find the other document? 



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From: "Sriram, Kotikalapudi (Fed)" <kotikalapudi.sriram@nist.gov>
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CC: "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "opsec@ietf.org" <opsec@ietf.org>,  "draft-ietf-opsec-urpf-improvements@ietf.org" <draft-ietf-opsec-urpf-improvements@ietf.org>, "Murphy, Sandra" <Sandra.Murphy@parsons.com>, Jen Linkova <furry13@gmail.com>, "opsec-chairs@ietf.org" <opsec-chairs@ietf.org>, Warren Kumari <warren@kumari.net>
Thread-Topic: RtgDir review: draft-ietf-opsec-urpf-improvements03.txt
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Subject: Re: [RTG-DIR] RtgDir review: draft-ietf-opsec-urpf-improvements03.txt
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Matthew:

Thank you for your comments. Sorry about the delay in replying.
We (authors) have uploaded a new version and have included changes
reflecting your comments. Please see:
https://tools.ietf.org/rfcdiff?url2=3Ddraft-ietf-opsec-urpf-improvements-04=
.txt =20
Please also see responses to your comments inline below.=20

>Summary:
>I have some minor concerns about this document that I think should be reso=
lved before publication.
>
>
>Comments:
>
>Generally, I found the draft quite readable, with a clear explanation of t=
he problem statements and solutions as well
>as the trade-offs on the implementation. However, I have one minor comment=
 and a nit.
>
>Major Issues:
>
>No major issues found.
>
>
>Minor Issues:
>
>Terminology: The document expands 'uRPF' as 'unicast reverse path filterin=
g'. However, I
>believe that uRPF commonly means 'unicast reverse path forwarding'   (see =
RFC3704 and
>most vendor documentation). "Ingress filtering" is the general concept and=
 "reverse path
> forwarding" the specific algorithm. Did the authors intend to use a new t=
erm, and if so why?
>

Great catch. I am surprised we (authors) overlooked and no one else caught =
it for so long.
Thank you!  Fixed.=20

>
>Nits:
>
>Section 2.5: "...separate from the global Routing Information Base (RIB) [=
Juniper][RFC4364]."
>VRFs are supported by most vendors so I think it is sufficient just to ref=
erence RFC4364.
>

The sentence now reads:
   The Virtual Routing and Forwarding (VRF) technology [RFC4364]
   [Juniper] allows a router to maintain multiple routing table
   instances separate from the global Routing Information Base (RIB).

Shuffled the order of references. Keeping [Juniper] because there is some=20
tutorial material in it that may be helpful for some readers.

Regards,
Sriram =20


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From: Mahend Negi <mahend.ietf@gmail.com>
Date: Sat, 31 Aug 2019 15:23:20 +0530
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To: Emmanuel Baccelli <Emmanuel.Baccelli@inria.fr>
Cc: draft-ietf-pce-association-diversity.all@ietf.org,  "<rtg-ads@ietf.org>" <rtg-ads@ietf.org>, rtg-dir@ietf.org, pce@ietf.org
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Subject: Re: [RTG-DIR] [Pce] RtgDir review: draft-ietf-pce-association-diversity-08.txt
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Hi Emmanuel,

Thanks for your review, updated in the new version.

FYI:
New Version:
https://datatracker.ietf.org/doc/html/draft-ietf-pce-association-diversity-10
Diff:
https://www.ietf.org/rfcdiff?url2=draft-ietf-pce-association-diversity-10

Regards,
Mahendra


On Mon, Aug 26, 2019 at 4:09 PM Emmanuel Baccelli <
Emmanuel.Baccelli@inria.fr> wrote:

> Dear Mahend
>
> thanks for you answers. Your changes look fine to me.
>
> Two last nits:
>
> - in the sentence you added in section 5.6 when the T flag is set, "In
> case of other PCEP message, the PCE MUST return a PCErr message with
> Error-Type 26".
> => PCEP message other than what? This is not crystal clear. I suggest you
> clarify explicitly.
>
> - in the sentence you added in section 5.6 when the T flag is unset, "the
> PCE is allowed to relax disjointness by either applying a requested
> objective function (Section 5.4) if specified.  Otherwise the PCE is
> allowed to reduce the required level   of disjointness (as it deems fit)"
> => as-is, there seems to be a typo: a spurious "either". How about:
>
> "the PCE is allowed to relax disjointness by applying a requested
> objective function (Section 5.4) if specified. Otherwise, if no objective
> function is specified, the PCE is allowed to reduce the required level of
> disjointness as it deems fit"
>
> Cheers
>
> Emmanuel
>
> On Tue, Aug 13, 2019 at 4:58 PM Mahend Negi <mahend.ietf@gmail.com> wrote:
>
>> Hi Emmanuel,
>>
>> Thanks for your comments. Please see inline, do find attached reworked
>> draft and version-diff for reference.
>>
>> On Tue, Aug 13, 2019 at 3:21 AM Emmanuel Baccelli <
>> Emmanuel.Baccelli@inria.fr> wrote:
>>
>>> Hello,
>>>
>>> I have been selected as the Routing Directorate reviewer for this draft.
>>> The Routing Directorate seeks to review all routing or routing-related
>>> drafts as they pass through IETF last call and IESG review, and sometimes
>>> on special request. The purpose of the review is to provide assistance to
>>> the Routing ADs. For more information about the Routing Directorate, please
>>> see http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir
>>>
>>> Although these comments are primarily for the use of the Routing ADs, it
>>> would be helpful if you could consider them along with any other IETF Last
>>> Call comments that you receive, and strive to resolve them through
>>> discussion or by updating the draft.
>>>
>>> Document: draft-ietf-pce-association-diversity-08.txt
>>> Reviewer: Emmanuel Baccelli
>>> Review Date: 12/08/2019
>>> Intended Status: Standards Track
>>>
>>> Summary of comments:
>>>
>>>     The procotol extension is simple, and its operation is documented
>>> pretty well.
>>>     The document is concise, and clear from my point of view.
>>>     See below a couple of remarks that could be considered prior to
>>> publication.
>>>
>>> Major Issues:
>>>
>>>     No major issues found.
>>>
>>> Minor Issues:
>>>
>>>     In Section 5 (Security): If I understand correctly, dynamically
>>> adding a new LSP to an existing disjoint association affects the
>>> (re)computation and the (re)characterization of all LSPs in this
>>> association. In this case, is it entirely obvious to me that there is no
>>> specific threat using the attack vector of adding an LSP to an existing
>>> association, when flag T is set?
>>>
>>
>> When T flag is set, we would have a case of no-path for the new LSP. It
>> would be good to also indicate that the new LSP could not be added into the
>> association group. I have added text for this.
>>
>> What is the state of other LSPs in an existing association after another
>>> LSP was added, which resulted in the required disjointness now fails?
>>>
>>
>> The other LSPs would not be impacted. So as such there is no specific
>> security threat with T flag. But, it would be good to add some generic
>> text. Updated section -
>>
>> 6. Security Considerations
>>
>>
>> This document defines one new type for association, which on itself does
>> not add any new security concerns beyond those discussed in
>>
>> [RFC5440], [RFC8231] and [I-D.ietf-pce-association-group]. But, adding of
>> a spurious LSP into the disjointness association group
>>
>> could lead to re-computation and set-up of all LSPs in the group, that
>> could be used to overwhelm the PCE and the network.
>>
>>
>> Also, as stated in [I-D.ietf-pce-association-group], much of the
>> information carried in the Disjointness Association object, as per
>>
>> this document is not extra sensitive. It often reflects information that
>> can also be derived from the LSP Database, but association
>>
>> provides a much easier grouping of related LSPs and messages. The
>> disjointness association could provide an adversary with the
>>
>> opportunity to eavesdrop on the relationship between the LSPs. Thus
>> securing the PCEP session using Transport Layer Security (TLS)
>>
>> [RFC8253], as per the recommendations and best current practices in
>> [RFC7525], is RECOMMENDED.
>>
>>>
>>
>>
>>> Nits:
>>>
>>>     In Section 3 (Motivation): In my opinion, this section might benefit
>>> from being split in two: a pure motivation section, and an applicability
>>> section.
>>>
>>
>> OK
>>
>>>
>>>     In Section 4.1: it is stated that "a PCE may be limited in the
>>> number of LSPs it can take into account when computing disjointness" [...]
>>> "the PCE may provide no path, a shortest path, or a constrained path based
>>> on relaxing disjointness, etc.  The disjoint status is informed to the
>>> PCC."
>>> Here, it would be useful to forward reference to section 4.6.
>>>
>>
>> OK
>>
>>>
>>>     In section 4.6: the spec seems to suppose that there exists an
>>> absolute order ranking different levels of disjointness,
>>> such that a PCE can simply take the decision to "reduce disjointness" to
>>> the next best level.
>>> I suspect that this is not always easy to rank in complex cases, if at
>>> all possible.
>>>
>>
>> Added (as it deems fit).
>>
>>
>>> Are some more flags foreseen (tbd in section 6.2 ?) for more
>>> fine-grained characterization of "relaxed disjointness" in complex cases
>>> e.g. when adding an LSP to an already-large disjoint association ?
>>> I assume the answer is "not really".
>>>
>> Your assumption is right.
>>
>>
>>>
>>> Assuming the above, without becoming too ugly, specification could be
>>> more explicit about ranking levels of disjointness which relaxing decisions
>>> should be made, when flag T is unset.
>>>
>> I think, adding "as it deems fit" is better and let implementations
>> decide with protocol signalling the result.
>>
>>
>>> Else, the spec could add a clarifying sentence on the difficulty of
>>> ordering absolutely many different levels of disjointness for many LSPs, in
>>> the same association.
>>>
>> Do you still feel this to be necessary? I am not too sure.
>>
>>
>> Thanks!
>>
>>
>> _______________________________________________
>>> Pce mailing list
>>> Pce@ietf.org
>>> https://www.ietf.org/mailman/listinfo/pce
>>>
>>

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<div dir=3D"ltr"><div dir=3D"ltr">Hi Emmanuel,<br>
<br>
Thanks for your review, updated in the new version.</div><div dir=3D"ltr"><=
br></div><div>FYI:</div><div>New Version:</div><div><a href=3D"https://data=
tracker.ietf.org/doc/html/draft-ietf-pce-association-diversity-10" rel=3D"n=
oreferrer" target=3D"_blank">https://datatracker.ietf.org/doc/html/draft-ie=
tf-pce-association-diversity-10</a><br>

Diff: <br></div><div><a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-i=
etf-pce-association-diversity-10" rel=3D"noreferrer" target=3D"_blank">http=
s://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-pce-association-diversity-10</a>=
</div><div dir=3D"ltr"><br></div><div>Regards,</div><div>Mahendra<br></div>=
<div><br></div><div><br></div><div class=3D"gmail_quote"><div dir=3D"ltr" c=
lass=3D"gmail_attr">On Mon, Aug 26, 2019 at 4:09 PM Emmanuel Baccelli &lt;<=
a href=3D"mailto:Emmanuel.Baccelli@inria.fr">Emmanuel.Baccelli@inria.fr</a>=
&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div=
 dir=3D"ltr"><div>Dear Mahend</div><div><br></div><div>thanks for you answe=
rs. Your changes look fine to me.</div><div><br></div><div>Two last nits:</=
div><div><br></div><div>- in the sentence  you added in section 5.6 when th=
e T flag is set, &quot;In case of other PCEP message, the PCE MUST return a=
 PCErr message with Error-Type 26&quot;.</div><div>=3D&gt; PCEP message oth=
er than what? This is not crystal clear. I suggest you clarify explicitly.<=
br></div><div><br></div><div>- in the sentence you added in section 5.6 whe=
n the T flag is unset, &quot;the PCE is allowed to relax disjointness by ei=
ther applying a requested objective function (Section 5.4) if specified.=C2=
=A0 Otherwise the PCE is allowed to reduce the required level =C2=A0 of dis=
jointness (as it deems fit)&quot;<br></div><div>=3D&gt; as-is, there seems =
to be a typo: a spurious &quot;either&quot;. How about:</div><div><br></div=
><div>&quot;the PCE is allowed to relax disjointness by applying a requeste=
d objective function (Section 5.4) if specified. Otherwise, if no objective=
 function is specified, the PCE is allowed to reduce the required level of =
disjointness as it deems fit&quot;</div><div><br></div><div>Cheers</div><di=
v><br></div><div>Emmanuel<br></div></div><br><div class=3D"gmail_quote"><di=
v dir=3D"ltr" class=3D"gmail_attr">On Tue, Aug 13, 2019 at 4:58 PM Mahend N=
egi &lt;<a href=3D"mailto:mahend.ietf@gmail.com" target=3D"_blank">mahend.i=
etf@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddi=
ng-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr">


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<p style=3D"margin-bottom:0cm;line-height:100%">Hi Emmanuel,</p>
<p style=3D"margin-bottom:0cm;line-height:100%">

</p>
<p style=3D"margin-bottom:0cm;line-height:100%">Thanks for your
comments. Please see inline, do find attached reworked draft and version-di=
ff for reference.=C2=A0<br></p>

</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">=
On Tue, Aug 13, 2019 at 3:21 AM Emmanuel Baccelli &lt;<a href=3D"mailto:Emm=
anuel.Baccelli@inria.fr" target=3D"_blank">Emmanuel.Baccelli@inria.fr</a>&g=
t; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0p=
x 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>H=
ello,<br><br>I have been selected as the Routing Directorate reviewer for t=
his draft. The Routing Directorate seeks to review all routing or routing-r=
elated drafts as they pass through IETF last call and IESG review, and some=
times on special request. The purpose of the review is to provide assistanc=
e to the Routing ADs. For more information about the Routing Directorate, p=
lease see <a href=3D"http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir" =
target=3D"_blank">http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir</a><=
br><br>Although these comments are primarily for the use of the Routing ADs=
, it would be helpful if you could consider them along with any other IETF =
Last Call comments that you receive, and strive to resolve them through dis=
cussion or by updating the draft.<br><br>Document: draft-ietf-pce-associati=
on-diversity-08.txt<br>Reviewer: Emmanuel Baccelli<br>Review Date: 12/08/20=
19<br>Intended Status: Standards Track <br><br>Summary of comments:<br><br>=
=C2=A0 =C2=A0 The procotol extension is simple, and its operation is docume=
nted pretty well.<br>=C2=A0 =C2=A0 The document is concise, and clear from =
my point of view. <br>=C2=A0 =C2=A0 See below a couple of remarks that coul=
d be considered prior to publication.<br><br>Major Issues:<br><br>=C2=A0 =
=C2=A0 No major issues found.<br><br>Minor Issues:<br><br>=C2=A0 =C2=A0 In =
Section 5 (Security): If I understand correctly, dynamically adding a new L=
SP to an existing disjoint association affects the (re)computation and the =
(re)characterization of all LSPs in this association. In this case, is it e=
ntirely obvious to me that there is no specific threat using the attack vec=
tor of adding an LSP to an existing association, when flag T is set?</div><=
/blockquote><div>=C2=A0</div><div>When T flag is set,
we would have a case of no-path for the new LSP. It would be good to
also indicate that the new LSP could not be added into the association
group. I have added text for this.</div><div><br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(2=
04,204,204);padding-left:1ex"><div dir=3D"ltr">What is the state of other L=
SPs in an existing association after another LSP was added, which resulted =
in the required disjointness now fails?<br></div></blockquote><div>=C2=A0<b=
r></div><div>The other LSPs would
not be impacted. So as such there is
no specific security threat with T flag. But, it would be
good to add some generic text. Updated section -</div><div>


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	<span></span>
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<p style=3D"margin-bottom:0cm;line-height:100%">6.  Security
Considerations</p>
<p style=3D"margin-bottom:0cm;line-height:100%"><br>

</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   This document
defines one new type for association, which on itself does not add any
new security concerns beyond those discussed in</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   [RFC5440],
[RFC8231] and [I-D.ietf-pce-association-group].  But, adding of a
spurious LSP into the disjointness association group</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   could lead to
re-computation and set-up of all LSPs in the group, that could be
used to overwhelm the PCE and the network.</p>
<p style=3D"margin-bottom:0cm;line-height:100%">

</p>
<p style=3D"margin-bottom:0cm;line-height:100%"><br></p><p style=3D"margin-=
bottom:0cm;line-height:100%">   Also, as stated
in [I-D.ietf-pce-association-group], much of the information
carried in the Disjointness Association object, as per</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   this document is
not extra sensitive.  It often reflects information that can also be
derived from the LSP Database, but association</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   provides a much
easier grouping of related LSPs and messages.  The disjointness
association could provide an adversary with the</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   opportunity to
eavesdrop on the relationship between the LSPs. Thus securing the
PCEP session using Transport Layer Security (TLS)</p>
<p style=3D"margin-bottom:0cm;line-height:100%">   [RFC8253], as per
the recommendations and best current practices in [RFC7525], is
RECOMMENDED.</p>

</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">

</div></blockquote><div>


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	<span></span>
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<p style=3D"margin-bottom:0cm;line-height:100%"><br></p>=C2=A0

<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr=
">Nits:<br><br>=C2=A0 =C2=A0 In Section 3 (Motivation): In my opinion, this=
 section might benefit from being split in two: a pure motivation section, =
and an applicability section.<br></div></blockquote><div>=C2=A0</div><div>O=
K <br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"l=
tr">=C2=A0 =C2=A0 <br>=C2=A0 =C2=A0 In Section 4.1: it is stated that &quot=
;a PCE may be limited in the number of LSPs it can take into account when c=
omputing disjointness&quot; [...] &quot;the PCE may provide no path, a shor=
test path, or a constrained path based on relaxing disjointness, etc.=C2=A0=
 The disjoint status is informed to the PCC.&quot; <br>Here, it would be us=
eful to forward reference to section 4.6.<br></div></blockquote><div>=C2=A0=
</div><div>OK <br></div><blockquote class=3D"gmail_quote" style=3D"margin:0=
px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><=
div dir=3D"ltr"><br>=C2=A0 =C2=A0 In section 4.6: the spec seems to suppose=
 that there exists an absolute order ranking different levels of disjointne=
ss,<br>such that a PCE can simply take the decision to &quot;reduce disjoin=
tness&quot; to the next best level.<br><div>I suspect that this is not alwa=
ys easy to rank in complex cases, if at all possible.</div></div></blockquo=
te><div><br></div><div>


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	<span></span>
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<p style=3D"margin-bottom:0cm;line-height:100%">Added (as it deems
fit).</p>=C2=A0

</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">Ar=
e some more flags foreseen (tbd in section 6.2 ?) for more fine-grained cha=
racterization of &quot;relaxed disjointness&quot; in complex cases e.g. whe=
n adding an LSP to an already-large disjoint association ?<br><div>I assume=
 the answer is &quot;not really&quot;.</div></div></blockquote><div>


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	<span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%">Your assumption is
right.</p>=C2=A0

<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr=
"><div><br></div>Assuming the above, without becoming too ugly, specificati=
on could be more explicit about ranking levels of disjointness which relaxi=
ng decisions should be made, when flag T is unset.<br></div></blockquote><d=
iv>


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	<span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%">I think, adding &quot;as
it deems fit&quot; is better and let implementations decide with protocol
signalling the result.</p>=C2=A0

<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr=
">Else, the spec could add a clarifying sentence on the difficulty of order=
ing absolutely many different levels of disjointness for many LSPs, in the =
same association.</div></blockquote><div><span></span>
=09
=09


<p style=3D"margin-bottom:0cm;line-height:100%">Do you still feel
this to be necessary? I am not too sure.</p>
<p style=3D"margin-bottom:0cm;line-height:100%"><br>

</p>
<p style=3D"margin-bottom:0cm;line-height:100%">Thanks!</p><p style=3D"marg=
in-bottom:0cm;line-height:100%"><br></p>

</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex">
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</blockquote></div></div>
</blockquote></div>
</blockquote></div></div>

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