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From: "Keyur Patel (keyupate)" <keyupate@cisco.com>
To: "BRUNGARD, DEBORAH A" <db3546@att.com>, Jonathan Hardwick <Jonathan.Hardwick@metaswitch.com>, "Jon Hudson (jon.hudson@gmail.com)" <jon.hudson@gmail.com>
Thread-Topic: [RTG-DIR] RtgDir Review: draft-ietf-pals-congcons-01
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Date: Tue, 8 Dec 2015 03:08:39 +0000
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Subject: [RTG-DIR]  RtgDir Review: draft-ietf-pals-congcons-01
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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
Thread-Topic: [L2tpext] RTG-DIR review: draft-ietf-l2tpext-keyed-ipv6-tunnel-05
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Date: Tue, 8 Dec 2015 12:58:42 +0000
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Cc: "rtg-dir@ietf.org" <rtg-dir@ietf.org>, Maciek Konstantynowicz <maciek@cisco.com>, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "draft-ietf-l2tpext-keyed-ipv6-tunnel.all@tools.ietf.org" <draft-ietf-l2tpext-keyed-ipv6-tunnel.all@tools.ietf.org>, "rtg-ads@ietf.org" <rtg-ads@ietf.org>, Rainer Schatzmayr <rainer.schatzmayr@telekom.de>, "Giles Heron \(giheron\)" <giheron@cisco.com>, "l2tpext-chairs@ietf.org" <l2tpext-chairs@ietf.org>, "Mark Townsley \(townsley\)" <townsley@cisco.com>, Wim Henderickx <wim.henderickx@alcatel-lucent.com>, "Stewart Bryant \(stbryant\)" <stbryant@cisco.com>
Subject: Re: [RTG-DIR] [L2tpext] RTG-DIR review:	draft-ietf-l2tpext-keyed-ipv6-tunnel-05
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Maciej, Giles, Rainer, Wim,

Ping =E2=80=94 this doc is stuck in your action. Are you interested in =
progressing it?

Thanks,

=E2=80=94 Carlos.

> On Nov 18, 2015, at 11:55 AM, Carlos Pignataro (cpignata) =
<cpignata@cisco.com> wrote:
>=20
> Authors,
>=20
> We have now 68 days of silent wait. Can you please answer the =
RTG-Directorate review comments below???
>=20
> Thanks,
>=20
> =E2=80=94 Carlos.
>=20
>> On Oct 15, 2015, at 3:21 PM, Carlos Pignataro (cpignata) =
<cpignata@cisco.com <mailto:cpignata@cisco.com>> wrote:
>>=20
>> Deborah, Authors of draft-ietf-l2tpext-keyed-ipv6-tunnel,
>>=20
>> Following up on this email =E2=80=94 who has the token on the next =
step?
>>=20
>> Authors, should you answer Sasha=E2=80=99s review?
>>=20
>> Thanks,
>>=20
>> =E2=80=94 Carlos.
>>=20
>>=20
>>> On Sep 18, 2015, at 1:34 PM, Alexander.Vainshtein@ecitele.com =
<mailto:Alexander.Vainshtein@ecitele.com> wrote:
>>>=20
>>> 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 =
<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.
>>>=20
>>> Document: draft-ietf-l2tpext-keyed-ipv6-tunnel-05txt
>>> Reviewer: Alexander (=E2=80=9CSasha=E2=80=9D) Vainshtein
>>> Review Date: 18-Sep-15
>>> IETF LC End Date: Not Known
>>> Intended Status: Proposed Standard
>>>=20
>>> Caveat:
>>> I am not an IPv6 expert and this can be the reason for some of my =
concerns about the draft.
>>> My experience with L2TPv3 is also outdated. So I=E2=80=99d like to =
ask the Routing ADs to take my comments with a big grain of salt.
>>>=20
>>> Summary:
>>> I have one significant concern about this document and recommend =
that the Routing ADs discuss these issues further with the authors. I =
also have several minor concerns about the document that I think should =
be resolved before publication, and I have find a couple of nits.
>>>=20
>>> Comments:
>>> As I see it, the draft is built around three key ideas:
>>> 1.      IPv6 addresses, due to their unlimited availability, can be =
used to identify attachment circuits (or VSI forwarders)  of L2TPv3 =
sessions (and not just tunnel endpoints as in RFC 3931).
>>> 2.      With IPv6 addresses used for identifying L2 circuits or VSI) =
to be connected by L2TPv3 PWs, L2TPv3 Session ID processing in the data =
plane can be bypassed. I can guess that this really simplifies data =
plane handling and that this was the prime driver for the technology the =
draft defines, but this is just a guess.
>>> 3.      L2TPv3 sessions identified by IPv6 addresses can be used to =
provide operator-managed services that neither need nor use L2TPv3 =
control plane. The control plane functionality is moved to an external =
management entity that can access both endpoints of the service, sets =
the service up and continuously intervenes in its operation until it =
tears down the service.
>>>=20
>>> The term =E2=80=9Ckeyed IPv6 tunnel=E2=80=9D refers to an L2TPv3 =
session that bypasses Session ID processing and relies on IPv6 addresses =
of its endpoints. Depending on the nature of emulated Ethernet service, =
these IPv6 addresses are used to identify either L2 attachment circuits =
for P2P services or Virtual Switching Instances (VSI) for MP2MP =
services.
>>>=20
>>> Since L2TPv3 control plane is by design left out of scope of the =
draft, it mainly deals with the data plane. Additional information about =
the management plane aspects can be found in the YANG Data Model =
<https://datatracker.ietf.org/doc/draft-ietf-l2tpext-keyed-v6-tunnel-yang/=
?include_text=3D1> draft.
>>>=20
>>> The draft is not easy to read and understand (at least to me), =
mainly because pieces of important information are often distributed =
throughout the text. One example illustrating this complaint:
>>> =C2=B7         The first sentence in Section 2 states that =E2=80=9CSt=
atic local configuration creates a one-to-one mapping between the  =
access-side L2 attachment circuit and the IP address used in the =
network-side IPv6 encapsulation.  The L2TPv3 Control Plane defined in =
RFC3931 is not used=E2=80=9D. This suggests(at least to me) that the =
management plane is involved just in setting up and tearing down a keyed =
IPv6 tunnel =E2=80=93 similar to how static PWs over MPLS PSN are =
operated.
>>>=20
>>> =C2=B7         The catch comes with the last sentence of Section 3: =
=E2=80=9CCookie values SHOULD be changed periodically=E2=80=9D thus =
indicating that continuous intervention of the management entity is =
expected for the entire life cycle of the service =E2=80=93 something =
that strongly smells of Lifecycle Service Orchestration (LSO) to me, =
even if the term is never mentioned.
>>>=20
>>> In the process of preparing this review I have sent my comments to =
the authors, to Carlos (the draft shepherd) and to Mark (who is listed =
as a contributing author). I have received very useful feedback  from =
them that has helped me to understand both the draft and the nature of =
our disagreements.  I would like to thank Giles, Rayner, Carlos and Mark =
for a very useful discussion, even if we did not reach an agreement on =
some of the points yet.
>>>=20
>>> Major Issue:
>>> Specification of encapsulation of Ethernet frames in Section 4 of =
the draft is incomplete and, to some extent, contradictory:
>>> 1.      L2TPv3 L2-specific sublayer  defined in RFC 3931 is not =
mentioned anywhere in the text.
>>> 2.      As the draft borrows encapsulation of Ethernet frames from =
RFC 4719, one could expect that its usage is OPTIONAL (same as in RFC =
4719)
>>> 3.      On the other hand, L2-specific sublayer does not appear in =
the diagram depicting the encapsulation on page 5, so one could easily =
assume that it cannot be used with keyed IPv6 tunnels
>>>=20
>>> 4.      To add to this confusion, the draft mentions ability to use =
VCCV in a keyed IPv6 tunnel (Section 6, last para), and references RFC =
5085. But this RFC, in Section 6.1 states that =E2=80=9CIn order to =
carry VCCV messages within an L2TPv3 session data packet, the PW MUST be =
established such that an L2-Specific Sublayer (L2SS) that defines the =
V-bit is present=E2=80=9D
>>>=20
>>> =46rom my POV the authors must clearly and unequivocally specify =
whether L2-specific sublayer can or cannot be used in keyed IPv6 =
tunnels. If they decide that it cannot be used, the references to VCCV =
must be removed from the draft.
>>>=20
>>> I believe that this gap is acknowledged by the document shepherd and =
by one of the authors.
>>>=20
>>>                Minor Issues:
>>>=20
>>> 1.      The draft does not explain the motivation for replacing the =
mechanism defined in RFC 4791 (which, AFAIK, was supposed to work =
equally well over IPv4 and IPv6). I can guess that bypassing processing =
of Session ID  simplifies the data plane processing, but this is just my =
guess. Some text explaining the benefits of keyed IPv6 tunnels in =
comparison with RFC 4719 would be most helpful IMO.
>>> 2.      To the best of my understanding, the technology defined in =
the draft heavily depends on availability of an external management =
entity that not only sets up and tears down the service (as is common =
with services that uses statically configured PWs, say, in MPLS-TP), but =
also intervenes in the operation of the service during its entire life =
cycle. However, the authors do not spell out their expectations from =
such an entity, the only exception being the need to periodically change =
the cookie values in a coordinated manner. I do not expect the draft to =
provide a detailed specification of such an entity, but I think that =
both the implementers and operators planning to deploy this technology =
would benefit from some additional information. In particular, the =
following aspects of behavior of the service that uses keyed IPv6 =
tunnels could be of special interest:
>>> a.       What happens to a P2P service that uses a keyed IPv6 tunnel =
to connect two Ethernet L2 circuits if failure of one of these circuits =
is detected (e.g., using Ethernet service CFM  between the Down MEP at =
the tunnel endpoint and a matching MEP in the CE as defined in Section =
6, the first bullet on page 8)? Is transmission across the IPv6 PSN at =
the other endpoint expected to be throttled by the management entity?
>>> b.      The possibility to use an anycast address for identification =
of a keyed IPv6 tunnel endpoint is mentioned twice in the draft - in =
Section 2, 3rd para and in Section 4, first bullet on page 6. What =
happens if an anycast address assigned to one of the endpoints of a =
keyed IPv6 tunnel moves across the network? Is the management entity =
expected to handle these transitions, say, by de-activating the former =
endpoint associated with an anycast address and activating the new one?
>>> c.       Is the management entity expected to emulate the PW =
redundancy mechanisms (defined in RFC 67180 and RFC 6870 for PWs over an =
MPLS PSN and in RFC 5641 for the PWs using L2TPv3? It should be noted =
that, in the case of MPLS PWs, PW redundancy switchover does not require =
involvement of a management entity even for statically configured PWs. =
Instead, static PW status messages (RFC 6478) are used
>>> d.      The draft mentions the possibility to use keyed IPv6 tunnels =
to connect VSI participating in an MP2MP Ethernet service (even if the =
term VSI is never used). To me this implies that local FIB in each of =
the VSI connected over keyed IPv6 tunnels would use MAC learning to =
populate its local FIB. In order to speed up convergence of such =
services following various external events, RFC 4672 introduces a =
dedicated mechanism for MAC withdrawal, and the PALS WG currently holds =
a WG item extending this functionality for VPLS services that use static =
PWs. Is the management entity expected to provide similar functionality =
as well? (It should be noted that MAC withdrawal mechanisms have been =
defined as OPTIONAL in RFC 4762, but, AFAIK, they are widely implemented =
and deployed in the field).
>>> 3.      The draft mentions (in many places) that it expects =
consistent configuration of the endpoints of a keyed IPv6 tunnel. =
However, the draft (probably following a similar omission in RFC 4719) =
never mentions whether the management entity should prevent setting up a =
keyed IPv6 tunnel between a pair of endpoints with different MTU of L2 =
circuits. (This is a clear-cut requirement in RFC 4448 for Ethernet PWs =
over an MPLS PSN, and a parallel requirement for PWs over L2TPv3 can be =
found in RFC 4667).  A short statement and a reference to RFC 4667 =
(missing in RFC 4719) would suffice IMO,
>>> 4.      As mentioned before, the draft de-facto assigns IPv6 =
addresses to access-side L2 circuits that are not IP interfaces (the =
draft uses the term =E2=80=9Cmapping=E2=80=9D, but I do not see any =
difference). The draft RECOMMENDS (in para 2 of Section 2) that =E2=80=9Cl=
ocal IPv6 addresses identifying L2TPv3 tunnels are assigned from  =
dedicated subnets used only for such tunnel endpoints=E2=80=9D. =46rom =
my POV this requirement is vague and the readers could benefit from =
clarification of associated issues. Again, I do not expect a detailed =
specification, but I would like to see the some answers to the following =
na=C3=AFve questions:
>>> a.       Is  an IPv6 address identifying an endpoint of a keyed IPv6 =
tunnel that is associated with a L2 circuit expected to remain reachable =
if the L2 circuit to which it is associated fails?
>>> b.      Are addresses (or subnets) used for identification of =
endpoints of keyed IPv6 tunnels expected to be exposed beyond the =
boundaries of the management domain controlled by the above-mentioned =
management entity? Could they appear in the public Internet routing =
tables?
>>> 5.      The draft says (Section 2, 3rd para) that =E2=80=9CCertain =
deployment scenarios may require using a single IPv6 address (typically =
a globally routable unicast or anycast address assigned to a virtual =
interface) to identify a tunnel endpoint for multiple IPv6 L2TPv3 =
tunnels.  For such cases the tunnel encapsulating device  identifies =
each tunnel by a unique combination of local and remote    IPv6 =
addresses=E2=80=9D. =46rom my POV the readers would benefit from the =
following clarifications:
>>> a.       What exactly =E2=80=9Ca globally routable address=E2=80=9D =
means in this context?
>>> b.      How, from the point of view of network reachability, are =
IPv6 addresses used in this scenario different from IPv6 addresses used =
to identify L2 circuits in other deployment scenarios?
>>> c.       Since the text mentions identification of the tunnel by an =
=E2=80=9Cencapsulation device=E2=80=9D, how is the tunnel identified by =
the decapsulating device? At least from the POV of MAC learning in the =
case of keyed IPv6 tunnels connecting VSI, identification of the tunnel =
by the decapsulating device seems more relevant to me
>>> d.      How should the device  know whether a specific keyed IPv6 =
tunnel can be identified by just one IPv6 address or by a =E2=80=9Ca =
unique combination of local and remote    IPv6 addresses=E2=80=9D?
>>> 6.      As I have mentioned above, some details pertaining to the =
management functionality associated with keyed IPv6 tunnels are defined =
in another L2TPEXT WG draft, but this draft is not mentioned in the =
draft I am reviewing.  I think that an Informative reference to this =
draft would be very much in place in this one.
>>> 7.      I wonder whether an Informative reference to a long =
(13-Jan-1999 according to the Datatracker) expired draft =
<https://datatracker.ietf.org/doc/draft-ietf-pppext-l2tphc/> of a =
concluded WG in the last sentence on page 3 has any value for the =
reader. If the ideas of this draft have found their way to some RFC, it =
should be used as a reference instead; otherwise I believe that this =
reference cold be safely removed.
>>>=20
>>> Some of the issues I have raised could be addressed in a suitable =
Applicability Statement section, but there are clearly other ways to =
handle them.
>>>=20
>>> Nits:
>>> I (or, rather, my spellchecker) has found two typos:
>>> =C2=B7         Section 2, para 2: s/endponts/endpoints/
>>> =C2=B7         Section 5, para 3 on page 7:  =
s/Fragmention/Fragmentation/
>>>=20
>>> Regards,
>>> Sasha
>>>=20
>>> Office: +972-39266302
>>> Cell:      +972-549266302
>>> Email:   Alexander.Vainshtein@ecitele.com =
<mailto:Alexander.Vainshtein@ecitele.com>
>>>=20
>>> _______________________________________________
>>> L2tpext mailing list
>>> L2tpext@ietf.org <mailto:L2tpext@ietf.org>
>>> https://www.ietf.org/mailman/listinfo/l2tpext =
<https://www.ietf.org/mailman/listinfo/l2tpext>
>> _______________________________________________
>> L2tpext mailing list
>> L2tpext@ietf.org <mailto:L2tpext@ietf.org>
>> https://www.ietf.org/mailman/listinfo/l2tpext
>=20


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Maciej, Giles, Rainer, Wim,<div class=3D""><br =
class=3D""></div><div class=3D"">Ping =E2=80=94 this doc is stuck in =
your action. Are you interested in progressing it?</div><div =
class=3D""><br class=3D""></div><div class=3D"">Thanks,</div><div =
class=3D""><br class=3D""></div><div class=3D"">=E2=80=94 =
Carlos.</div><div class=3D""><br class=3D""><div><blockquote type=3D"cite"=
 class=3D""><div class=3D"">On Nov 18, 2015, at 11:55 AM, Carlos =
Pignataro (cpignata) &lt;<a href=3D"mailto:cpignata@cisco.com" =
class=3D"">cpignata@cisco.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><meta =
http-equiv=3D"Content-Type" content=3D"text/html charset=3Dutf-8" =
class=3D""><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: =
space; -webkit-line-break: after-white-space;" class=3D"">Authors,<div =
class=3D""><br class=3D""></div><div class=3D"">We have now 68 days of =
silent wait. Can you please answer the RTG-Directorate review comments =
below???</div><div class=3D""><br class=3D""></div><div =
class=3D"">Thanks,</div><div class=3D""><br class=3D""></div><div =
class=3D"">=E2=80=94 Carlos.</div><div class=3D""><br class=3D""><div =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">On Oct =
15, 2015, at 3:21 PM, Carlos Pignataro (cpignata) &lt;<a =
href=3D"mailto:cpignata@cisco.com" class=3D"">cpignata@cisco.com</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><meta =
http-equiv=3D"Content-Type" content=3D"text/html charset=3Dutf-8" =
class=3D""><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: =
space; -webkit-line-break: after-white-space;" class=3D"">Deborah, =
Authors of draft-ietf-l2tpext-keyed-ipv6-tunnel,<div class=3D""><br =
class=3D""></div><div class=3D"">Following up on this email =E2=80=94 =
who has the token on the next step?</div><div class=3D""><br =
class=3D""></div><div class=3D"">Authors, should you answer Sasha=E2=80=99=
s review?</div><div class=3D""><br class=3D""></div><div =
class=3D"">Thanks,</div><div class=3D""><br class=3D""></div><div =
class=3D"">=E2=80=94 Carlos.</div><div class=3D""><br =
class=3D""></div><div class=3D""><br class=3D""><div =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">On Sep =
18, 2015, at 1:34 PM, <a href=3D"mailto:Alexander.Vainshtein@ecitele.com" =
class=3D"">Alexander.Vainshtein@ecitele.com</a> wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; orphans: auto; text-align: =
start; text-indent: 0px; text-transform: none; white-space: normal; =
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Hello,<o:p class=3D""></o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D""><span =
class=3D"apple-converted-space"><span style=3D"font-size: 11pt;" =
class=3D"">I&nbsp;</span></span><span style=3D"font-size: 11pt;" =
class=3D"">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<span =
class=3D"apple-converted-space">&nbsp;</span><a =
href=3D"http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir" =
style=3D"color: purple; text-decoration: underline;" class=3D""><span =
class=3D"icon"><span style=3D"color: rgb(68, 0, 136);" =
class=3D"">=E2=80=8B</span></span><span style=3D"font-size: 12pt; color: =
rgb(68, 0, 136);" =
class=3D"">http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir</span></a>=
<o:p class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white; orphans: auto; text-align: start; widows: 1; =
-webkit-text-stroke-width: 0px; word-spacing: 0px;" class=3D""><span =
style=3D"font-size: 11pt;" class=3D"">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.<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D""><span =
style=3D"font-size: 11pt;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white; orphans: auto; text-align: start; widows: 1; =
-webkit-text-stroke-width: 0px; word-spacing: 0px;" class=3D""><span =
style=3D"font-size: 11pt;" class=3D"">Document:<span =
class=3D"apple-converted-space">&nbsp;</span>draft-ietf-l2tpext-keyed-ipv6=
-tunnel-05txt<span class=3D"apple-converted-space">&nbsp;</span><br =
class=3D"">Reviewer: Alexander (=E2=80=9CSasha=E2=80=9D) Vainshtein<br =
class=3D"">Review Date: 18-Sep-15<br class=3D"">IETF LC End Date: Not =
Known<span class=3D"apple-converted-space">&nbsp;</span><br =
class=3D"">Intended Status: Proposed Standard<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white; orphans: auto; text-align: start; widows: 1; =
-webkit-text-stroke-width: 0px; word-spacing: 0px;" class=3D""><strong =
class=3D""><o:p class=3D"">&nbsp;</o:p></strong></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif; background-color: white;" class=3D""><strong =
class=3D""><span style=3D"font-size: 11pt;" class=3D"">Caveat:<o:p =
class=3D""></o:p></span></strong></div><p style=3D"margin-right: 0cm; =
margin-left: 36pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; margin-bottom: 0.0001pt; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><span style=3D"font-size: 11pt;" class=3D"">I am =
not an IPv6 expert and this can be the reason for some of my concerns =
about the draft.</span><o:p class=3D""></o:p></p><p style=3D"margin-right:=
 0cm; margin-left: 36pt; font-size: 12pt; font-family: 'Times New =
Roman', serif; margin-bottom: 0.0001pt; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><span style=3D"font-size: 11pt;" class=3D"">My =
experience with L2TPv3 is also outdated. So I=E2=80=99d like to ask the =
Routing ADs to take my comments with a big grain of salt.<o:p =
class=3D""></o:p></span></p><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D""><strong class=3D""><o:p =
class=3D"">&nbsp;</o:p></strong></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D""><strong class=3D""><span =
style=3D"font-size: 11pt;" class=3D"">Summary:</span></strong><span =
class=3D"apple-converted-space"><span style=3D"font-size: 11pt;" =
class=3D"">&nbsp;</span><o:p class=3D""></o:p></span></div><p =
style=3D"margin-right: 0cm; margin-left: 36pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; margin-bottom: 0.0001pt; =
background-color: white; background-position: initial initial; =
background-repeat: initial initial;" class=3D""><span style=3D"font-size: =
11pt;" class=3D"">I have one significant concern about this document and =
recommend that the Routing ADs discuss these issues further with the =
authors. I also have several minor concerns about the document that I =
think should be resolved before publication, and I have find a couple of =
nits.<o:p class=3D""></o:p></span></p><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D""><strong class=3D""><o:p =
class=3D"">&nbsp;</o:p></strong></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D""><strong class=3D""><span =
style=3D"font-size: 11pt;" class=3D"">Comments:</span><o:p =
class=3D""></o:p></strong></div><p style=3D"margin-right: 0cm; =
margin-left: 36pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; margin-bottom: 0.0001pt; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><span style=3D"font-size: 11pt;" class=3D"">As I =
see it, the draft is built around three key ideas:<o:p =
class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; margin-left: =
75.15pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
margin-bottom: 0.0001pt; text-indent: -18pt; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><span style=3D"font-size: 11pt;" class=3D""><span =
class=3D"">1.<span style=3D"font-style: normal; font-variant: normal; =
font-weight: normal; font-size: 7pt; line-height: normal; font-family: =
'Times New Roman';" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">IPv6 addresses, due to their unlimited availability, can be =
used to identify attachment circuits (or VSI forwarders)&nbsp; of L2TPv3 =
sessions (and not just tunnel endpoints as in RFC 3931).<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; margin-left: =
75.15pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
margin-bottom: 0.0001pt; text-indent: -18pt; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><span style=3D"font-size: 11pt;" class=3D""><span =
class=3D"">2.<span style=3D"font-style: normal; font-variant: normal; =
font-weight: normal; font-size: 7pt; line-height: normal; font-family: =
'Times New Roman';" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">With IPv6 addresses used for identifying L2 circuits or VSI) =
to be connected by L2TPv3 PWs, L2TPv3 Session ID processing in the data =
plane can be bypassed. I can guess that this really simplifies data =
plane handling and that this was the prime driver for the technology the =
draft defines, but this is just a guess.<o:p =
class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; margin-left: =
75.15pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
margin-bottom: 0.0001pt; text-indent: -18pt; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><span style=3D"font-size: 11pt;" class=3D""><span =
class=3D"">3.<span style=3D"font-style: normal; font-variant: normal; =
font-weight: normal; font-size: 7pt; line-height: normal; font-family: =
'Times New Roman';" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">L2TPv3 sessions identified by IPv6 addresses can be used to =
provide operator-managed services that neither need nor use L2TPv3 =
control plane. The control plane functionality is moved to an external =
management entity that can access both endpoints of the service, sets =
the service up and continuously intervenes in its operation until it =
tears down the service.<o:p class=3D""></o:p></span></p><p =
style=3D"margin-right: 0cm; margin-left: 36pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; margin-bottom: 0.0001pt; =
background-color: white; background-position: initial initial; =
background-repeat: initial initial;" class=3D""><span style=3D"font-size: =
11pt;" class=3D""><o:p class=3D"">&nbsp;</o:p></span></p><p =
style=3D"margin-right: 0cm; margin-left: 36pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; margin-bottom: 0.0001pt; =
background-color: white; background-position: initial initial; =
background-repeat: initial initial;" class=3D""><span style=3D"font-size: =
11pt;" class=3D"">The term =E2=80=9Ckeyed IPv6 tunnel=E2=80=9D refers to =
an L2TPv3 session that bypasses Session ID processing and relies on IPv6 =
addresses of its endpoints. Depending on the nature of emulated Ethernet =
service, these IPv6 addresses are used to identify either L2 attachment =
circuits for P2P services or Virtual Switching Instances (VSI) for MP2MP =
services.<o:p class=3D""></o:p></span></p><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D""><span style=3D"font-size: 11pt;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><p =
style=3D"margin-right: 0cm; margin-left: 36pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; margin-bottom: 0.0001pt; =
background-color: white; background-position: initial initial; =
background-repeat: initial initial;" class=3D""><span style=3D"font-size: =
11pt;" class=3D"">Since L2TPv3 control plane is by design left out of =
scope of the draft, it mainly deals with the data plane. Additional =
information about the management plane aspects can be found in the<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"https://datatracker.ietf.org/doc/draft-ietf-l2tpext-keyed-v6-tunne=
l-yang/?include_text=3D1" style=3D"color: purple; text-decoration: =
underline;" class=3D"">YANG Data Model</a><span =
class=3D"Apple-converted-space">&nbsp;</span>draft.<o:p =
class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; margin-left: =
36pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
margin-bottom: 0.0001pt; background-color: white; background-position: =
initial initial; background-repeat: initial initial;" class=3D""><span =
style=3D"font-size: 11pt;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></p><p style=3D"margin-right: 0cm; =
margin-left: 36pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; margin-bottom: 0.0001pt; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><span style=3D"font-size: 11pt;" class=3D"">The =
draft is not easy to read and understand (at least to me), mainly =
because pieces of important information are often distributed throughout =
the text.</span><span style=3D"font-size: 11pt; font-family: 'Courier =
New';" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span></span><span =
style=3D"font-size: 11pt;" class=3D"">One example illustrating this =
complaint:<o:p class=3D""></o:p></span></p><p style=3D"margin-right: =
0cm; margin-left: 72pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; text-indent: -18pt; background-color: white; background-position: =
initial initial; background-repeat: initial initial;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Symbol;" class=3D""><span =
class=3D"">=C2=B7<span style=3D"font-style: normal; font-variant: =
normal; font-weight: normal; font-size: 7pt; line-height: normal; =
font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">The first sentence in Section 2 states that =E2=80=9C</span><sp=
an style=3D"font-size: 11pt; font-family: 'Courier New';" =
class=3D"">Static local configuration creates a one-to-one mapping =
between the&nbsp; access-side L2 attachment circuit and the IP address =
used in the network-side IPv6 encapsulation.&nbsp; The L2TPv3 Control =
Plane defined in RFC3931 is not used</span><span style=3D"font-size: =
11pt;" class=3D"">=E2=80=9D. This suggests(at least to me) that the =
management plane is involved just in setting up and tearing down a keyed =
IPv6 tunnel =E2=80=93 similar to how static PWs over MPLS PSN are =
operated.<o:p class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; =
margin-left: 72pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; text-indent: -18pt; background-color: white; background-position: =
initial initial; background-repeat: initial initial;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Symbol;" class=3D""><span =
class=3D"">=C2=B7<span style=3D"font-style: normal; font-variant: =
normal; font-weight: normal; font-size: 7pt; line-height: normal; =
font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">The catch comes with the last sentence of Section 3: =
=E2=80=9C</span><span style=3D"font-size: 11pt; font-family: 'Courier =
New';" class=3D"">Cookie values SHOULD be changed =
periodically</span><span style=3D"font-size: 11pt;" class=3D"">=E2=80=9D =
thus indicating that continuous intervention of the management entity is =
expected for the entire life cycle of the service =E2=80=93 something =
that strongly smells of Lifecycle Service Orchestration (LSO) to me, =
even if the term is never mentioned.<o:p class=3D""></o:p></span></p><p =
style=3D"margin-right: 0cm; margin-left: 36pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; margin-bottom: 0.0001pt; =
background-color: white; background-position: initial initial; =
background-repeat: initial initial;" class=3D""><span style=3D"font-size: =
11pt;" class=3D"">In the process of preparing this review I have sent my =
comments to the authors, to Carlos (the draft shepherd) and to Mark (who =
is listed as a contributing author). I have received very useful =
feedback&nbsp; from them that has helped me to understand both the draft =
and the nature of our disagreements.&nbsp; I would like to thank Giles, =
Rayner, Carlos and Mark for a very useful discussion, even if we did not =
reach an agreement on some of the points yet.<o:p =
class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; margin-left: =
36pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
margin-bottom: 0.0001pt; background-color: white; background-position: =
initial initial; background-repeat: initial initial;" class=3D""><span =
style=3D"font-size: 11pt;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></p><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D""><strong class=3D""><span =
style=3D"font-size: 11pt;" class=3D"">Major Issue:</span><o:p =
class=3D""></o:p></strong></div><p style=3D"margin-right: 0cm; =
margin-left: 54pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; margin-bottom: 0.0001pt; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><span style=3D"font-size: 11pt;" =
class=3D"">Specification of encapsulation of Ethernet frames in Section =
4 of the draft is incomplete and, to some extent, contradictory:<o:p =
class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; margin-left: =
90pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
margin-bottom: 0.0001pt; text-indent: -18pt; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><span style=3D"font-size: 11pt;" class=3D""><span =
class=3D"">1.<span style=3D"font-style: normal; font-variant: normal; =
font-weight: normal; font-size: 7pt; line-height: normal; font-family: =
'Times New Roman';" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">L2TPv3 L2-specific sublayer&nbsp; defined in RFC 3931 is not =
mentioned anywhere in the text.<o:p class=3D""></o:p></span></p><p =
style=3D"margin-right: 0cm; margin-left: 90pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; margin-bottom: 0.0001pt; =
text-indent: -18pt; background-color: white; background-position: =
initial initial; background-repeat: initial initial;" class=3D""><span =
style=3D"font-size: 11pt;" class=3D""><span class=3D"">2.<span =
style=3D"font-style: normal; font-variant: normal; font-weight: normal; =
font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">As the draft borrows encapsulation of Ethernet frames from =
RFC 4719, one could expect that its usage is OPTIONAL (same as in RFC =
4719)<o:p class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; =
margin-left: 90pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; text-indent: -18pt; background-color: white; background-position: =
initial initial; background-repeat: initial initial;" class=3D""><span =
style=3D"font-size: 11pt;" class=3D""><span class=3D"">3.<span =
style=3D"font-style: normal; font-variant: normal; font-weight: normal; =
font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">On the other hand, L2-specific sublayer does not appear in =
the diagram depicting the encapsulation on page 5, so one could easily =
assume that it cannot be used with keyed IPv6 tunnels<o:p =
class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; margin-left: =
90pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
text-indent: -18pt; background-color: white; background-position: =
initial initial; background-repeat: initial initial;" class=3D""><span =
style=3D"font-size: 11pt;" class=3D""><span class=3D"">4.<span =
style=3D"font-style: normal; font-variant: normal; font-weight: normal; =
font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">To add to this confusion, the draft mentions ability to use =
VCCV in a keyed IPv6 tunnel (Section 6, last para), and references RFC =
5085. But this RFC, in Section 6.1 states that =E2=80=9C</span><span =
style=3D"font-size: 11pt; font-family: 'Courier New';" class=3D"">In =
order to carry VCCV messages within an L2TPv3 session data packet, the =
PW MUST be established such that an L2-Specific Sublayer (L2SS) that =
defines the V-bit is present</span><span style=3D"font-size: 11pt;" =
class=3D"">=E2=80=9D<o:p class=3D""></o:p></span></p><p =
style=3D"margin-right: 0cm; margin-left: 54pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><span style=3D"font-size: 11pt;" class=3D"">=46rom =
my POV the authors must clearly and unequivocally specify whether =
L2-specific sublayer can or cannot be used in keyed IPv6 tunnels. If =
they decide that it cannot be used, the references to VCCV must be =
removed from the draft.<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; margin-left: =
54pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white; background-position: initial initial; =
background-repeat: initial initial;" class=3D""><span style=3D"font-size: =
11pt;" class=3D"">I believe that this gap is acknowledged by the =
document shepherd and by one of the authors.<o:p =
class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; margin-left: =
0cm; font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white; background-position: initial initial; =
background-repeat: initial initial;" class=3D""><span style=3D"font-size: =
11pt;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span><strong class=3D"">Minor =
Issues:</strong><o:p class=3D""></o:p></span></p><p style=3D"margin-right:=
 0cm; margin-left: 72pt; font-size: 12pt; font-family: 'Times New =
Roman', serif; margin-bottom: 0.0001pt; text-indent: -18pt; =
background-color: white; background-position: initial initial; =
background-repeat: initial initial;" class=3D""><span style=3D"font-size: =
11pt;" class=3D""><span class=3D"">1.<span style=3D"font-style: normal; =
font-variant: normal; font-weight: normal; font-size: 7pt; line-height: =
normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">The draft does not explain the motivation for replacing the =
mechanism defined in RFC 4791 (which, AFAIK, was supposed to work =
equally well over IPv4 and IPv6). I can guess that bypassing processing =
of Session ID&nbsp; simplifies the data plane processing, but this is =
just my guess. Some text explaining the benefits of keyed IPv6 tunnels =
in comparison with RFC 4719 would be most helpful IMO.<o:p =
class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; margin-left: =
72pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
margin-bottom: 0.0001pt; text-indent: -18pt; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><strong class=3D""><span style=3D"font-weight: =
normal;" class=3D""><span class=3D"">2.<span style=3D"font-style: =
normal; font-variant: normal; font-weight: normal; font-size: 7pt; =
line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span></strong=
><span dir=3D"LTR" class=3D""></span><strong class=3D""><span =
style=3D"font-size: 11pt; font-weight: normal;" class=3D"">To the best =
of my understanding, the technology defined in the draft heavily depends =
on availability of an external management entity that not only sets up =
and tears down the service (as is common with services that uses =
statically configured PWs, say, in MPLS-TP), but also intervenes in the =
operation of the service during its entire life cycle. However, the =
authors do not spell out their expectations from such an entity, the =
only exception being the need to periodically change the cookie values =
in a coordinated manner. I do not expect the draft to provide a detailed =
specification of such an entity, but I think that both the implementers =
and operators planning to deploy this technology would benefit from some =
additional information. In particular, the following aspects of behavior =
of the service that uses keyed IPv6 tunnels could be of special =
interest:</span></strong><strong class=3D""><span style=3D"font-weight: =
normal;" class=3D""><o:p class=3D""></o:p></span></strong></p><p =
style=3D"margin-right: 0cm; margin-left: 108pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; margin-bottom: 0.0001pt; =
text-indent: -18pt; background-color: white; background-position: =
initial initial; background-repeat: initial initial;" class=3D""><strong =
class=3D""><span style=3D"font-size: 11pt; font-weight: normal;" =
class=3D""><span class=3D"">a.<span style=3D"font-style: normal; =
font-variant: normal; font-weight: normal; font-size: 7pt; line-height: =
normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span></strong=
><span dir=3D"LTR" class=3D""></span><strong class=3D""><span =
style=3D"font-size: 11pt; font-weight: normal;" class=3D"">What happens =
to a P2P service that uses a keyed IPv6 tunnel to connect two Ethernet =
L2 circuits if failure of one of these circuits is detected (e.g., using =
Ethernet service CFM&nbsp; between the Down MEP at the tunnel endpoint =
and a matching MEP in the CE as defined in Section 6, the first bullet =
on page 8)? Is transmission across the IPv6 PSN at the other endpoint =
expected to be throttled by the management entity?<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></span></strong></p><p style=3D"margin-right: 0cm; =
margin-left: 108pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; margin-bottom: 0.0001pt; text-indent: -18pt; background-color: =
white; background-position: initial initial; background-repeat: initial =
initial;" class=3D""><strong class=3D""><span style=3D"font-size: 11pt; =
font-weight: normal;" class=3D""><span class=3D"">b.<span =
style=3D"font-style: normal; font-variant: normal; font-weight: normal; =
font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span></strong=
><span dir=3D"LTR" class=3D""></span><strong class=3D""><span =
style=3D"font-size: 11pt; font-weight: normal;" class=3D"">The =
possibility to use an anycast address for identification of a keyed IPv6 =
tunnel endpoint is mentioned twice in the draft - in Section 2, 3<sup =
class=3D"">rd</sup><span class=3D"Apple-converted-space">&nbsp;</span>para=
 and in Section 4, first bullet on page 6. What happens if an anycast =
address assigned to one of the endpoints of a keyed IPv6 tunnel moves =
across the network? Is the management entity expected to handle these =
transitions, say, by de-activating the former endpoint associated with =
an anycast address and activating the new one?<o:p =
class=3D""></o:p></span></strong></p><p style=3D"margin-right: 0cm; =
margin-left: 108pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; margin-bottom: 0.0001pt; text-indent: -18pt; background-color: =
white; background-position: initial initial; background-repeat: initial =
initial;" class=3D""><strong class=3D""><span style=3D"font-size: 11pt; =
font-weight: normal;" class=3D""><span class=3D"">c.<span =
style=3D"font-style: normal; font-variant: normal; font-weight: normal; =
font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span></strong=
><span dir=3D"LTR" class=3D""></span><strong class=3D""><span =
style=3D"font-size: 11pt; font-weight: normal;" class=3D"">Is the =
management entity expected to emulate the PW redundancy mechanisms =
(defined in RFC 67180 and RFC 6870 for PWs over an MPLS PSN and in RFC =
5641 for the PWs using L2TPv3? It should be noted that, in the case of =
MPLS PWs, PW redundancy switchover does not require involvement of a =
management entity even for statically configured PWs. Instead, static PW =
status messages (RFC 6478) are used<o:p =
class=3D""></o:p></span></strong></p><p style=3D"margin-right: 0cm; =
margin-left: 108pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; margin-bottom: 0.0001pt; text-indent: -18pt; background-color: =
white; background-position: initial initial; background-repeat: initial =
initial;" class=3D""><strong class=3D""><span style=3D"font-size: 11pt; =
font-weight: normal;" class=3D""><span class=3D"">d.<span =
style=3D"font-style: normal; font-variant: normal; font-weight: normal; =
font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span></strong=
><span dir=3D"LTR" class=3D""></span><strong class=3D""><span =
style=3D"font-size: 11pt; font-weight: normal;" class=3D"">The draft =
mentions the possibility to use keyed IPv6 tunnels to connect VSI =
participating in an MP2MP Ethernet service (even if the term VSI is =
never used). To me this implies that local FIB in each of the VSI =
connected over keyed IPv6 tunnels would use MAC learning to populate its =
local FIB. In order to speed up convergence of such services following =
various external events, RFC 4672 introduces a dedicated mechanism for =
MAC withdrawal, and the PALS WG currently holds a WG item extending this =
functionality for VPLS services that use static PWs. Is the management =
entity expected to provide similar functionality as well? (It should be =
noted that MAC withdrawal mechanisms have been defined as OPTIONAL in =
RFC 4762, but, AFAIK, they are widely implemented and deployed in the =
field).<o:p class=3D""></o:p></span></strong></p><p style=3D"margin-right:=
 0cm; margin-left: 72pt; font-size: 12pt; font-family: 'Times New =
Roman', serif; margin-bottom: 0.0001pt; text-indent: -18pt; =
background-color: white; background-position: initial initial; =
background-repeat: initial initial;" class=3D""><strong class=3D""><span =
style=3D"font-size: 11pt; font-weight: normal;" class=3D""><span =
class=3D"">3.<span style=3D"font-style: normal; font-variant: normal; =
font-weight: normal; font-size: 7pt; line-height: normal; font-family: =
'Times New Roman';" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span></strong=
><span dir=3D"LTR" class=3D""></span><strong class=3D""><span =
style=3D"font-size: 11pt; font-weight: normal;" class=3D"">The draft =
mentions (in many places) that it expects consistent configuration of =
the endpoints of a keyed IPv6 tunnel. However, the draft (probably =
following a similar omission in RFC 4719) never mentions whether the =
management entity should prevent setting up a keyed IPv6 tunnel between =
a pair of endpoints with different MTU of L2 circuits. (This is a =
clear-cut requirement in RFC 4448 for Ethernet PWs over an MPLS PSN, and =
a parallel requirement for PWs over L2TPv3 can be found in RFC =
4667).&nbsp; A short statement and a reference to RFC 4667 (missing in =
RFC 4719) would suffice IMO,<o:p class=3D""></o:p></span></strong></p><p =
style=3D"margin-right: 0cm; margin-left: 72pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; margin-bottom: 0.0001pt; =
text-indent: -18pt; background-color: white; background-position: =
initial initial; background-repeat: initial initial;" class=3D""><span =
class=3D"">4.<span style=3D"font-style: normal; font-variant: normal; =
font-weight: normal; font-size: 7pt; line-height: normal; font-family: =
'Times New Roman';" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span><span =
dir=3D"LTR" class=3D""></span><strong class=3D""><span style=3D"font-size:=
 11pt; font-weight: normal;" class=3D"">As mentioned before, the draft =
de-facto assigns IPv6 addresses to access-side L2 circuits that are not =
IP interfaces (the draft uses the term =E2=80=9Cmapping=E2=80=9D, but I =
do not see any difference). The draft RECOMMENDS (in para 2 of Section =
2) that =E2=80=9C</span></strong><span style=3D"font-size: 11pt; =
font-family: 'Courier New';" class=3D"">l<span style=3D"" class=3D"">ocal =
IPv6 addresses identifying L2TPv3 tunnels are assigned from&nbsp; =
dedicated subnets used only for such tunnel endpoints</span></span><span =
style=3D"font-size: 11pt;" class=3D"">=E2=80=9D. =46rom my POV this =
requirement is vague and the readers could benefit from clarification of =
associated issues. Again, I do not expect a detailed specification, but =
I would like to see the some answers to the following na=C3=AFve =
questions:</span><o:p class=3D""></o:p></p><p style=3D"margin-right: =
0cm; margin-left: 108pt; font-size: 12pt; font-family: 'Times New =
Roman', serif; margin-bottom: 0.0001pt; text-indent: -18pt; =
background-color: white; background-position: initial initial; =
background-repeat: initial initial;" class=3D""><span style=3D"font-size: =
11pt;" class=3D""><span class=3D"">a.<span style=3D"font-style: normal; =
font-variant: normal; font-weight: normal; font-size: 7pt; line-height: =
normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">Is&nbsp; an IPv6 address identifying an endpoint of a keyed =
IPv6 tunnel that is associated with a L2 circuit expected to remain =
reachable if the L2 circuit to which it is associated fails?<o:p =
class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; margin-left: =
108pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
margin-bottom: 0.0001pt; text-indent: -18pt; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><span style=3D"font-size: 11pt;" class=3D""><span =
class=3D"">b.<span style=3D"font-style: normal; font-variant: normal; =
font-weight: normal; font-size: 7pt; line-height: normal; font-family: =
'Times New Roman';" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">Are addresses (or subnets) used for identification of =
endpoints of keyed IPv6 tunnels expected to be exposed beyond the =
boundaries of the management domain controlled by the above-mentioned =
management entity? Could they appear in the public Internet routing =
tables?<o:p class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; =
margin-left: 72pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; margin-bottom: 0.0001pt; text-indent: -18pt; background-color: =
white; background-position: initial initial; background-repeat: initial =
initial;" class=3D""><span style=3D"font-size: 11pt;" class=3D""><span =
class=3D"">5.<span style=3D"font-style: normal; font-variant: normal; =
font-weight: normal; font-size: 7pt; line-height: normal; font-family: =
'Times New Roman';" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">The draft says (Section 2, 3<sup class=3D"">rd</sup><span =
class=3D"Apple-converted-space">&nbsp;</span>para) that =E2=80=9C</span><s=
pan style=3D"font-size: 11pt; font-family: 'Courier New';" =
class=3D"">Certain deployment scenarios may require using a single IPv6 =
address (typically a globally routable unicast or anycast address =
assigned to a virtual interface) to identify a tunnel endpoint for =
multiple IPv6 L2TPv3 tunnels.&nbsp; For such cases the tunnel =
encapsulating device &nbsp;identifies each tunnel by a unique =
combination of local and remote &nbsp;&nbsp;&nbsp;IPv6 =
addresses</span><span style=3D"font-size: 11pt;" class=3D"">=E2=80=9D. =
=46rom my POV the readers would benefit from the following =
clarifications:<o:p class=3D""></o:p></span></p><p style=3D"margin-right: =
0cm; margin-left: 108pt; font-size: 12pt; font-family: 'Times New =
Roman', serif; margin-bottom: 0.0001pt; text-indent: -18pt; =
background-color: white; background-position: initial initial; =
background-repeat: initial initial;" class=3D""><span style=3D"font-size: =
11pt;" class=3D""><span class=3D"">a.<span style=3D"font-style: normal; =
font-variant: normal; font-weight: normal; font-size: 7pt; line-height: =
normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">What exactly =E2=80=9C</span><span style=3D"font-size: 11pt; =
font-family: 'Courier New';" class=3D"">a globally routable =
address</span><span style=3D"font-size: 11pt;" class=3D"">=E2=80=9D =
means in this context?<o:p class=3D""></o:p></span></p><p =
style=3D"margin-right: 0cm; margin-left: 108pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; margin-bottom: 0.0001pt; =
text-indent: -18pt; background-color: white; background-position: =
initial initial; background-repeat: initial initial;" class=3D""><span =
style=3D"font-size: 11pt;" class=3D""><span class=3D"">b.<span =
style=3D"font-style: normal; font-variant: normal; font-weight: normal; =
font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">How, from the point of view of network reachability, are IPv6 =
addresses used in this scenario different from IPv6 addresses used to =
identify L2 circuits in other deployment scenarios?<o:p =
class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; margin-left: =
108pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
margin-bottom: 0.0001pt; text-indent: -18pt; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><span style=3D"font-size: 11pt;" class=3D""><span =
class=3D"">c.<span style=3D"font-style: normal; font-variant: normal; =
font-weight: normal; font-size: 7pt; line-height: normal; font-family: =
'Times New Roman';" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">Since the text mentions identification of the tunnel by an =
=E2=80=9C</span><span style=3D"font-size: 11pt; font-family: 'Courier =
New';" class=3D"">encapsulation device</span><span style=3D"font-size: =
11pt;" class=3D"">=E2=80=9D, how is the tunnel identified by the =
decapsulating device? At least from the POV of MAC learning in the case =
of keyed IPv6 tunnels connecting VSI, identification of the tunnel by =
the decapsulating device seems more relevant to me<o:p =
class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; margin-left: =
108pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
margin-bottom: 0.0001pt; text-indent: -18pt; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><span style=3D"font-size: 11pt;" class=3D""><span =
class=3D"">d.<span style=3D"font-style: normal; font-variant: normal; =
font-weight: normal; font-size: 7pt; line-height: normal; font-family: =
'Times New Roman';" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">How should the device &nbsp;know whether a specific keyed =
IPv6 tunnel can be identified by just one IPv6 address or by a =
=E2=80=9C</span><span style=3D"font-size: 11pt; font-family: 'Courier =
New';" class=3D"">a unique combination of local and remote =
&nbsp;&nbsp;&nbsp;IPv6 addresses</span><span style=3D"font-size: 11pt;" =
class=3D"">=E2=80=9D?<o:p class=3D""></o:p></span></p><p =
style=3D"margin-right: 0cm; margin-left: 72pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; margin-bottom: 0.0001pt; =
text-indent: -18pt; background-color: white; background-position: =
initial initial; background-repeat: initial initial;" class=3D""><span =
class=3D"">6.<span style=3D"font-style: normal; font-variant: normal; =
font-weight: normal; font-size: 7pt; line-height: normal; font-family: =
'Times New Roman';" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span><span =
dir=3D"LTR" class=3D""></span><span style=3D"font-size: 11pt;" =
class=3D"">As I have mentioned above, some details pertaining to the =
management functionality associated with keyed IPv6 tunnels are defined =
in another L2TPEXT WG draft, but this draft is not mentioned in the =
draft I am reviewing</span>.&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span><span style=3D"font-size: =
11pt;" class=3D"">I think that an Informative reference to this draft =
would be very much in place in this one.</span><o:p =
class=3D""></o:p></p><p style=3D"margin-right: 0cm; margin-left: 72pt; =
font-size: 12pt; font-family: 'Times New Roman', serif; margin-bottom: =
0.0001pt; text-indent: -18pt; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><strong class=3D""><span style=3D"font-size: 11pt; =
font-weight: normal;" class=3D""><span class=3D"">7.<span =
style=3D"font-style: normal; font-variant: normal; font-weight: normal; =
font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span></strong=
><span dir=3D"LTR" class=3D""></span><strong class=3D""><span =
style=3D"font-size: 11pt; font-weight: normal;" class=3D"">I wonder =
whether an Informative reference to a long (13-Jan-1999 according to the =
Datatracker) expired<span class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"https://datatracker.ietf.org/doc/draft-ietf-pppext-l2tphc/" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">draft</a><span class=3D"Apple-converted-space">&nbsp;</span>of =
a concluded WG in the last sentence on page 3 has any value for the =
reader. If the ideas of this draft have found their way to some RFC, it =
should be used as a reference instead; otherwise I believe that this =
reference cold be safely removed.<o:p =
class=3D""></o:p></span></strong></p><p style=3D"margin-right: 0cm; =
margin-left: 36pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; margin-bottom: 0.0001pt; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><o:p class=3D"">&nbsp;</o:p></p><p =
style=3D"margin-right: 0cm; margin-left: 36pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; margin-bottom: 0.0001pt; =
background-color: white; background-position: initial initial; =
background-repeat: initial initial;" class=3D""><span style=3D"font-size: =
11pt;" class=3D"">Some of the issues I have raised could be addressed in =
a suitable Applicability Statement section, but there are clearly other =
ways to handle them.<o:p class=3D""></o:p></span></p><div style=3D"margin:=
 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; background-color: white;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif; =
background-color: white;" class=3D""><strong class=3D""><span =
style=3D"font-size: 11pt;" class=3D"">Nits:<o:p =
class=3D""></o:p></span></strong></div><p style=3D"margin-right: 0cm; =
margin-left: 36pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; margin-bottom: 0.0001pt; background-color: white; =
background-position: initial initial; background-repeat: initial =
initial;" class=3D""><strong class=3D""><span style=3D"font-size: 11pt; =
font-weight: normal;" class=3D"">I (or, rather, my spellchecker) has =
found two typos:<o:p class=3D""></o:p></span></strong></p><p =
style=3D"margin-right: 0cm; margin-left: 72pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; margin-bottom: 0.0001pt; =
text-indent: -18pt; background-color: white; background-position: =
initial initial; background-repeat: initial initial;" class=3D""><span =
style=3D"font-family: Symbol;" class=3D""><span class=3D"">=C2=B7<span =
style=3D"font-style: normal; font-variant: normal; font-weight: normal; =
font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><strong class=3D""><span style=3D"font-size:=
 11pt; font-weight: normal;" class=3D"">Section 2, para 2:<span =
class=3D"Apple-converted-space">&nbsp;</span></span></strong><span =
style=3D"font-size: 10.5pt; font-family: 'Courier New';" =
class=3D"">s/endponts/endpoints/</span><o:p class=3D""></o:p></p><p =
style=3D"margin-right: 0cm; margin-left: 72pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; margin-bottom: 0.0001pt; =
text-indent: -18pt; background-color: white; background-position: =
initial initial; background-repeat: initial initial;" class=3D""><span =
style=3D"font-family: Symbol;" class=3D""><span class=3D"">=C2=B7<span =
style=3D"font-style: normal; font-variant: normal; font-weight: normal; =
font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
dir=3D"LTR" class=3D""></span><strong class=3D""><span style=3D"font-size:=
 11pt; font-weight: normal;" class=3D"">Section 5, para 3 on page =
7:&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></strong><span =
style=3D"font-size: 10.5pt; font-family: 'Courier New';" =
class=3D"">s/Fragmention/Fragmentation/</span><o:p =
class=3D""></o:p></p><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; background-color: white;" =
class=3D""><span style=3D"font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Regards,<o:p class=3D""></o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Sasha<o:p class=3D""></o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Office: +972-39266302<o:p class=3D""></o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
+972-549266302<o:p class=3D""></o:p></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Email:&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:Alexander.Vainshtein@ecitele.com" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">Alexander.Vainshtein@ecitele.com</a><o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><span style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; =
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start; text-indent: 0px; text-transform: none; white-space: normal; =
widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: =
none; display: inline !important;" =
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none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><span style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; orphans: auto; text-align: =
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-----END PGP SIGNATURE-----

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From: "Giles Heron (giheron)" <giheron@cisco.com>
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
Thread-Topic: [L2tpext] RTG-DIR review: draft-ietf-l2tpext-keyed-ipv6-tunnel-05
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Date: Tue, 8 Dec 2015 13:11:04 +0000
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References: <DB3PR03MB07802A1F72B4B0E8459E60779D590@DB3PR03MB0780.eurprd03.prod.outlook.com> <8FEFEEB2-0AC5-4C81-9727-AB9D49DB1913@cisco.com> <743196D6-DD0E-44C7-916B-E70824FE2A15@cisco.com>, <D8223CD8-6049-49ED-A4C1-0B0F68F6E0B8@cisco.com>
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Subject: Re: [RTG-DIR] [L2tpext] RTG-DIR review:	draft-ietf-l2tpext-keyed-ipv6-tunnel-05
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Giles Heron (giheron)" <giheron@cisco.com>
Thread-Topic: [L2tpext] RTG-DIR review: draft-ietf-l2tpext-keyed-ipv6-tunnel-05
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Subject: Re: [RTG-DIR] [L2tpext] RTG-DIR review:	draft-ietf-l2tpext-keyed-ipv6-tunnel-05
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Keyur,

Thx for confirming you have no technical issues, and for your comments 
on readability.
Responses inline...

On 08/12/15 03:08, Keyur Patel (keyupate) 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-pals-congcons-01
> Reviewer: Keyur Patel
> Review Date: 07-Dec-2015
> Intended Status: Informational Track
>
> Summary:
> No major technical issues found. Minor nits are listed below.
>
> Comments:
> IMHO, the document authors could try and simplify the document text.
I'm afraid this doc is the result of years of horse-trading over the 
minutiae of the language. So it is best that we resist changes unless 
absolutely necessary. Nonetheless, where I resist some of your specific 
suggestions below, it is irrespective of the likelihood of opening up 
more years of argument - it is because I genuinely prefer the original - 
and I have explained why where necessary.

I should add that most of the original is Yaakov's text, so I cannot be 
accused of being precious with my own words here.

More generally, I prefer not to change a document where the improvement 
is marginal and the original was OK, otherwise it increases the chance 
of errors creeping in (it also consumes time unnecessarily).

>
> Major Issues:
> None.
>
> Minor Issues
> None.
>
> Nits:
>
>
> 1) Abstract:
>
> <snip>
>
>  PWs consume no more network capacity than a TCP flow.
>
> </snip>
>
> Consider replacing with:
>
> PWs do not consume any more network capacity than a TCP flow.
>
IMO, the original (Yaakov's text) is neither incorrect nor hard to 
comprehend or scan.
>
>
> 2) Abstract:
>
> <snip>
>
> For TDM
>
>    PWs, we find that the level of congestion at which the PW can no
>
>    longer deliver acceptable TDM service is never significantly greater
>
>    than this bound, and typically much lower.
>
> </snip>
>
> consider replacing with:
>
> For TDM
>
>    PWs, we find that the level of congestion at which the PW can no
>
>    longer deliver acceptable TDM service is never significantly greater
>
>    than this bound, and is typically much lower.
>
The "and" couples two adjectives after the verb "to be", so another verb 
"to be" isn't needed. However, the comma should be removed (and I know 
the RFC Editor deals with commas very effectively).

Perhaps better would have been:
TDM service is never significantly greater and typically much lower than 
this bound.
>
>
> 3) Abstract:
>
> <snip>
>
> with acceptable TDM service criteria.
>
> </snip>
>
> consider replacing with:
>
> with an acceptable TDM service criteria.
>
"criteria" is (deliberately) the plural.
>
>
> 4) Introduction, 7th paragraph:
>
> <snip>
>
> Were   we to accept this tenet, we would require a PW to back off under
>
>    congestion to consume no more bandwidth than a single TCP flow under
>
>    such conditions (see [RFC5348]). However, since PWs may carry....
>
> </snip>
>
> Consider replacing with:
>
> If we were to accept this tenet, we would require a PW to back off under
>
>    congestion in order to not consume any more bandwidth than a single 
> TCP flow under
>
>    such conditions (see [RFC5348]). However, since a PW may carry
>
OK, Yaakov's style is perhaps a little old-fashioned, but the 
subjunctive mood used here is perfectly comprehensible (and correct).
I don't see the need to make 'PWs' singular in the last sentence either.
>
>
> 5) Introduction, 8th paragraph:
>
> <snip>
>
> The following two sections consider PWs of two types.
>
> </snip>
>
> Consider replacing with:
>
> The following two sections evaluates/analyses PWs of two types of data 
> flows.
>
[Subject-verb inconsistency in the suggested replacement.]
"consider" seems fine to me anyway.
>
>
> 6) Introduction, 9th Paragraph:
>
> replace/behaviors/behavior
>
We intended "the combined behaviours" to mean "the (plural) behaviours 
before combining", not "the (singular) behaviour after combining".
>
>
> 7) Introduction, 9th Paragraph:
>
>
> What is TCP-unfriendly? It would be nice to spell this out explicitly 
> (atleast for the first reference).
>
OK. That's reasonable - at least we should spell out the definition of 
TCP Friendly early in the doc, rather than just by reference. I think 
TCP-unfriendly would then become obvious.

I suggest we alter the sentence in the introduction (already quoted 
above) that refers to RFC5348, as follows:

OLD:
Were we to accept this tenet, we would require a PW to back off under
congestion to consume no more bandwidth than a single TCP flow under
such conditions (see [RFC5348]).
NEW:
Were we to accept this tenet, we would require a PW to back off under
congestion so as to consume roughly similar bandwidth to a single TCP 
flow under
similar conditions (this is the definition of TCP Friendliness [RFC5348]).


>
> 8) Section 3, last paragraph:
>
> <snip>
>
> We have limited our treatment to the case of TCP traffic carried by
>
>    Ethernet PWs (which are by far the most commonly deployed packet-
>
>    carrying pseudowires) ....
>
> </snip>
>
> consider replacing it with:
>
> We have limited our analysis to the case of TCP traffic carried by
>
>    Ethernet PWs (which by far are the most commonly deployed packet-
>
>    carrying pseudowires)
>
OK, but 'treatment' is no worse IMO.
>
>
> 9) Section 4, 1st paragraph:
>
> <snip>
>
> Inelastic PWs, such as TDM PWs ([RFC4553][RFC5086][RFC5087]), are
>
>    potentially more problematic than the elastic PWs of the previous
>
>    section.
>
> </snip>
>
> consider replacing with:
>
> Inelastic PWs, such as TDM PWs ([RFC4553][RFC5086][RFC5087]), are
>
>    potentially more problematic than the elastic PWs mentioned in the 
> previous
>
>    section.
>
Elastic PWs were the core subject of the previous section, so 
"mentioned" is rather too casual. I think the original was fine.
>
>
> 10) Section 4, 3rd paragraph:
>
> <snip>
>
> In the following we will focus on structure-agnostic TDM PWs
>
>    [RFC4553] although similar analysis can be readily applied to
>
>    structure-aware PWs (see Appendix B).
>
> </snip>
>
> Consider replacing with:
>
> In this section We will focus on structure-agnostic TDM PWs
>
>    [RFC4553] although similar analysis can be readily applied to
>
>    structure-aware PWs (see Appendix B).
>
We did actually mean "the following", not "this section", because the 
earlier text in the section is more general.

I notice the capitalisation of "We" in the middle of the sentence. 
However, we are neither royalty or deity (well, only One of us is ;)
>
>
> 11) Section 4, 3rd paragraph:
>
>
> replace/acceptable TDM Service/an acceptable TDM service..
>
I prefer it without "an".
>
>
> 12) Section 4, 4th paragraph:
>
> <snip>
>
> Also note that
>
>    being unable to deliver acceptable TDM service for a short amount of
>
>    time is insufficient justification for shutting down a TDM PW.
>
> </snip>
>
> Consider replacing it with:
>
> Also note that
>
>    being unable to deliver an acceptable TDM service for a short amount of
>
>    time is an insufficient justification for shutting down a TDM PW.
>
Again, I prefer it without "an".
>
>
> 13) Section 4, 5th paragraph:
>
> <snip>
>
> Due to
>
>    native TDM services being designed with this low latency in mind,
>
>    emulated TDM services are usually required to have similarly low end-
>
>    to-end delay.
>
> </snip>
>
> Consider replacing it with:
>
> Since the native TDM services are being designed with this low latency
>
>    in mind, the
>
>    emulated TDM services are also required to have similarly low end-
>
>    to-end latency.
>

Drawing from both, I prefer:
Since TDM services are designed with this low latency in mind,

    emulated TDM services are usually required to have similar low end-

    to-end delay.

>
> 14) Section 4, 8th Paragraph:
>
> <snip>
>
> Since the TDM rates are constant (T1 and E1
>
>    having payload throughputs of 1.544 Mbps and 2.048 Mbps
>
>    respectively), and Structure-Agnostic TDM over packet (SAToP) can
>
>    only faithfully emulate a TDM service up to a PLR of about half a
>
>    percent, the T1 and E1 pseudowires occupy line segments on the graph.
>
> On the other hand, the TCP rate equation produces rate curves
>
>    dependent on both one-way delay and packet loss.
>
> </snip>
>
> Consider replacing it with:
>
> Since the TDM rates are constant (T1 and E1
>
>    payload having throughputs of 1.544 Mbps and 2.048 Mbps
>
>    respectively), and Structure-Agnostic TDM over packet (SAToP) can
>
>    only faithfully emulate a TDM service up to a PLR of about half a
>
>    percent, the T1 and E1 pseudowires occupy line segments on the graph.
>
>    On the other hand, the TCP rate equation produces rate curves
>
>    dependent on both one-way delay and the packet loss.
>
I prefer the original in the case of both edits:
* A payload doesn't have a throughput, but a service does have a payload 
throughput.
* One would only use 'the' with packet loss if one was referring to a 
particular packet loss figure, not packet loss as a parameter.
>
>
> 15) Section 4, 9th paragraph:
>
> <snip>
>
> Only for small packets,
>
>    long one-way delays, and high packet loss ratios, do TDM PWs
>
>    potentially consume more bandwidth, and even then only marginally.
>
> Further, our "apples to apples" comparison forced the TCP traffic to
>
>    use packets much smaller than would be typical.
>
> </snip>
>
> Consider replacing it with:
>
> Only for small packet sizes,
>
>    long one-way delays, and high packet loss ratios, the TDM PWs
>
>    potentially consume more bandwidth, and even then only marginally.
>
> Furthermore, our "apples to apples" comparison forced the TCP traffic to
>
>    use much smaller than the typical packet size.
>
I don't prefer either suggested replacement.
"Only for small packets ... do PWs consume" was fine for me. But if you 
prefer I would be happy with:
For small packets,long one-way delays, and high packet loss ratios, TDM 
PWs potentially consume more bandwidth, but only marginally.
>
>
> 16) Section 4, 12th paragraph:
>
> <snip>
>
> We can use the TCP rate equation to determine precise conditions
>
>    under which a TDM PW consumes no more bandwidth than a TCP flow
>
>    between the same endpoints would consume under identical conditions.
>
> </snip>
>
> Consider replacing it with:
>
> We can use the TCP rate equation to determine precise conditions
>
>    under which a TDM PW consumes no more bandwidth than a TCP flow
>
>    between the same endpoints under identical conditions.
>
>
That's better.

Thank you again,


Bob

-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/


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    <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
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  <body text="#000000" bgcolor="#FFFFFF">
    Keyur,<br>
    <br>
    Thx for confirming you have no technical issues, and for your
    comments on readability. <br>
    Responses inline...<br>
    <br>
    <div class="moz-cite-prefix">On 08/12/15 03:08, Keyur Patel
      (keyupate) wrote:<br>
    </div>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
      <div style="font-size: 14px; font-family: Calibri, sans-serif;">
        <div style="font-family: Consolas; font-size: medium;">Hello,</div>
        <div style="font-family: Consolas; font-size: medium;"><br>
        </div>
        <div style="font-family: Consolas; font-size: medium;">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 ​<a
            moz-do-not-send="true"
            href="http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir"><a class="moz-txt-link-freetext" href="http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir">http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir</a></a>.</div>
        <div style="font-family: Consolas; font-size: medium;"><br>
        </div>
        <div style="font-family: Consolas; font-size: medium;">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.</div>
        <div style="font-family: Consolas; font-size: medium;"><br>
        </div>
        <div style="font-family: Consolas; font-size: medium;">Document:
          draft-ietf-pals-congcons-01</div>
        <div style="font-family: Consolas; font-size: medium;">Reviewer:
          Keyur Patel</div>
        <div style="font-family: Consolas; font-size: medium;">Review
          Date: 07-Dec-2015</div>
        <div style="font-family: Consolas; font-size: medium;">Intended
          Status: Informational Track</div>
      </div>
      <div style="font-size: medium; font-family: Consolas;"><br>
      </div>
      <div style="font-size: medium; font-family: Consolas;">Summary:</div>
      <div style="font-size: medium; font-family: Consolas;"><span class="Apple-tab-span" style="white-space: pre;"></span>No
        major technical issues found. Minor nits are listed below. </div>
      <div style="font-size: medium; font-family: Consolas;"><br>
      </div>
      <div style="font-size: medium; font-family: Consolas;">Comments:</div>
      <div style="font-size: medium; font-family: Consolas;"><span class="Apple-tab-span" style="white-space: pre;"></span>IMHO,
        the document authors could try and simplify the document text.</div>
    </blockquote>
    I'm afraid this doc is the result of years of horse-trading over the
    minutiae of the language. So it is best that we resist changes
    unless absolutely necessary. Nonetheless, where I resist some of
    your specific suggestions below, it is irrespective of the
    likelihood of opening up more years of argument - it is because I
    genuinely prefer the original - and I have explained why where
    necessary.<br>
    <br>
    I should add that most of the original is Yaakov's text, so I cannot
    be accused of being precious with my own words here.<br>
    <br>
    More generally, I prefer not to change a document where the
    improvement is marginal and the original was OK, otherwise it
    increases the chance of errors creeping in (it also consumes time
    unnecessarily).<br>
    <br>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <div style="font-size: medium; font-family: Consolas;"><br>
      </div>
      <div style="font-size: medium; font-family: Consolas;">Major
        Issues:</div>
      <div style="font-size: medium; font-family: Consolas;"><span class="Apple-tab-span" style="white-space: pre;"></span>None.</div>
      <div style="font-size: medium; font-family: Consolas;"><br>
      </div>
      <div style="font-size: medium; font-family: Consolas;">Minor
        Issues</div>
      <div style="font-size: medium; font-family: Consolas;"><span class="Apple-tab-span" style="white-space: pre;"></span>None.</div>
      <div style="font-size: medium; font-family: Consolas;"><br>
      </div>
      <div style="font-size: medium; font-family: Consolas;">Nits:</div>
      <div style="font-size: medium; font-family: Consolas;"><span class="Apple-tab-span" style="white-space: pre;"></span></div>
      <div>
        <p style="font-size: 11px; font-family: Menlo; margin: 0px;"><br>
        </p>
        <p style="margin: 0px;"><font face="Consolas">1) Abstract:</font></p>
        <p style="margin: 0px; min-height: 13px;"><font face="Consolas">&lt;snip&gt;</font></p>
        <p style="margin: 0px; min-height: 13px;"><font face="Consolas"> PWs
            consume no more network capacity than a TCP flow.</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;/snip&gt;</font></p>
        <p style="margin: 0px; min-height: 13px;"><font face="Consolas">Consider
            replacing with: </font></p>
        <p style="margin: 0px; min-height: 13px;"><font face="Consolas">PWs
            do not consume any more network capacity than a TCP flow.</font></p>
      </div>
    </blockquote>
    <font face="Consolas">IMO, the original (</font><font
      face="Consolas"><font face="Consolas">Yaakov's text</font>) is
      neither incorrect nor hard to comprehend or scan.</font><br>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <div>
        <p style="margin: 0px; min-height: 13px;"><font face="Consolas"><br>
          </font></p>
        <p style="margin: 0px; min-height: 13px;"><font face="Consolas">2)
            Abstract:</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">For TDM</font></p>
        <p style="margin: 0px;"><font face="Consolas">   PWs, we find
            that the level of congestion at which the PW can no</font></p>
        <p style="margin: 0px;"><font face="Consolas">   longer deliver
            acceptable TDM service is never significantly greater</font></p>
        <p style="margin: 0px;"><font face="Consolas">   than this
            bound, and typically much lower.</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;/snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">consider replacing
            with:</font></p>
        <p style="margin: 0px;"><font face="Consolas">For TDM</font></p>
        <p style="margin: 0px;"><font face="Consolas">   PWs, we find
            that the level of congestion at which the PW can no</font></p>
        <p style="margin: 0px;"><font face="Consolas">   longer deliver
            acceptable TDM service is never significantly greater</font></p>
        <p style="margin: 0px;"><font face="Consolas">   than this
            bound, and is typically much lower.</font></p>
      </div>
    </blockquote>
    <font face="Consolas">The "and" couples two adjectives after the
      verb "to be", so another verb "to be" isn't needed. However, the
      comma should be removed (and I know the RFC Editor deals with
      commas very effectively). <br>
      <br>
      Perhaps better would have been:<br>
      TDM service is never significantly greater and typically much
      lower than this bound.</font><br>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <div>
        <p style="margin: 0px; min-height: 13px;"><font face="Consolas"><br>
          </font></p>
        <p style="margin: 0px;"><font face="Consolas">3) Abstract:</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">with acceptable
            TDM service criteria.</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;/snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">consider replacing
            with:</font></p>
        <p style="margin: 0px;"><font face="Consolas">with an acceptable
            TDM service criteria.</font></p>
      </div>
    </blockquote>
    <font face="Consolas">"criteria" is (deliberately) the plural.</font><br>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <div>
        <p style="margin: 0px; min-height: 13px;"><font face="Consolas"><br>
          </font></p>
        <p style="margin: 0px;"><font face="Consolas">4) Introduction,
            7th paragraph:</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">Were   we to
            accept this tenet, we would require a PW to back off under</font></p>
        <p style="margin: 0px;"><font face="Consolas">   congestion to
            consume no more bandwidth than a single TCP flow under</font></p>
        <p style="margin: 0px;"><font face="Consolas">   such conditions
            (see [RFC5348]). However, since PWs may carry....</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;/snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">Consider replacing
            with:</font></p>
        <p style="margin: 0px;"><font face="Consolas">If we were to
            accept this tenet, we would require a PW to back off under</font></p>
        <p style="margin: 0px;"><font face="Consolas">   congestion in
            order to not consume any more bandwidth than a single TCP
            flow under</font></p>
        <p style="margin: 0px;"><font face="Consolas">   such conditions
            (see [RFC5348]). However, since a PW may carry</font></p>
      </div>
    </blockquote>
    <font face="Consolas">OK, Yaakov's style is perhaps a little
      old-fashioned, but </font><font face="Consolas"><font
        face="Consolas">the subjunctive mood</font> used here is
      perfectly comprehensible (and correct). <br>
      I don't see the need to make 'PWs' singular in the last sentence
      either.<br>
    </font>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <div>
        <p style="margin: 0px; min-height: 13px;"><font face="Consolas"><br>
          </font></p>
        <p style="margin: 0px;"><font face="Consolas">5) Introduction,
            8th paragraph:</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">The following two
            sections consider PWs of two types.</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;/snip&gt;</font></p>
        <div><font face="Consolas">Consider replacing with:</font></div>
      </div>
      <div><font face="Consolas"><span style="color: rgb(0, 0, 0);
            font-style: normal; font-weight: normal; text-decoration:
            none;">
            <p style="margin: 0px;">The following two sections
              evaluates/analyses PWs of two types of data flows.</p>
          </span></font></div>
    </blockquote>
    <font face="Consolas">[Subject-verb inconsistency in the suggested
      replacement.]<br>
      "consider" seems fine to me anyway.</font><br>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <div><font face="Consolas"><span style="color: rgb(0, 0, 0);
            font-style: normal; font-weight: normal; text-decoration:
            none;">
            <p style="margin: 0px; min-height: 13px;"><br>
            </p>
            <p style="margin: 0px;">6) Introduction, 9th Paragraph:</p>
            <p style="margin: 0px;">replace/behaviors/behavior</p>
          </span></font></div>
    </blockquote>
    <font face="Consolas">We intended "the combined behaviours" to mean
      "the (plural) behaviours before combining", not "the (singular)
      behaviour after combining".</font><br>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <div><font face="Consolas"><span style="color: rgb(0, 0, 0);
            font-style: normal; font-weight: normal; text-decoration:
            none;">
            <p style="margin: 0px; min-height: 13px;"><br>
            </p>
            <p style="margin: 0px;">7) Introduction, 9th Paragraph:</p>
            <p style="margin: 0px; min-height: 13px;"><br>
            </p>
            <p style="margin: 0px; min-height: 13px;">What is
              TCP-unfriendly? It would be nice to spell this out
              explicitly (atleast for the first reference).</p>
          </span></font></div>
    </blockquote>
    <font face="Consolas">OK. That's reasonable - at least we should
      spell out the definition of TCP Friendly early in the doc, rather
      than just by reference. I think TCP-unfriendly would then become
      obvious.<br>
      <br>
      I suggest we alter the sentence </font><font face="Consolas"><font
        face="Consolas">in the introduction </font>(already quoted
      above) that refers to RFC5348, as follows:<br>
      <br>
      OLD:<br>
      Were we to accept this tenet, we would require a PW to back off
      under<br>
      congestion to consume no more bandwidth than a single TCP flow
      under<br>
      such conditions (see [RFC5348]).<br>
      NEW:<br>
      Were we to accept this tenet, we would require a PW to back off
      under<br>
      congestion so as to consume roughly similar bandwidth to a single
      TCP flow under<br>
      similar conditions (this is the definition of TCP Friendliness
      [RFC5348]).<br>
    </font><br>
    <br>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <div><font face="Consolas"><span style="color: rgb(0, 0, 0);
            font-style: normal; font-weight: normal; text-decoration:
            none;">
            <p style="margin: 0px; min-height: 13px;"><br>
            </p>
            <p style="margin: 0px; min-height: 13px;">8) Section 3, last
              paragraph:</p>
            <p style="margin: 0px; min-height: 13px;">&lt;snip&gt;</p>
            <p style="margin: 0px;">We have limited our treatment to the
              case of TCP traffic carried by</p>
            <p style="margin: 0px;">   Ethernet PWs (which are by far
              the most commonly deployed packet-</p>
            <p style="margin: 0px;">   carrying pseudowires) ....</p>
            <p style="margin: 0px;">&lt;/snip&gt;</p>
            <p style="margin: 0px; min-height: 13px;">consider replacing
              it with:</p>
            <p style="margin: 0px; min-height: 13px;">We have limited
              our analysis to the case of TCP traffic carried by</p>
            <p style="margin: 0px;">   Ethernet PWs (which by far are
              the most commonly deployed packet-</p>
            <p style="margin: 0px;">   carrying pseudowires)</p>
          </span></font></div>
    </blockquote>
    <font face="Consolas">OK, but 'treatment' is no worse IMO.</font><br>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <div><font face="Consolas"><span style="color: rgb(0, 0, 0);
            font-style: normal; font-weight: normal; text-decoration:
            none;">
            <p style="margin: 0px; min-height: 13px;"><br>
            </p>
            <p style="margin: 0px;">9) Section 4, 1st paragraph:</p>
            <p style="margin: 0px;">&lt;snip&gt;</p>
            <p style="margin: 0px;">Inelastic PWs, such as TDM PWs
              ([RFC4553][RFC5086][RFC5087]), are</p>
            <p style="margin: 0px;">   potentially more problematic than
              the elastic PWs of the previous</p>
            <p style="margin: 0px;">   section. </p>
            <p style="margin: 0px;">&lt;/snip&gt;</p>
            <p style="margin: 0px;">consider replacing with:</p>
            <p style="margin: 0px;">Inelastic PWs, such as TDM PWs
              ([RFC4553][RFC5086][RFC5087]), are</p>
            <p style="margin: 0px;">   potentially more problematic than
              the elastic PWs mentioned in the previous</p>
            <p style="margin: 0px;">   section. <br>
            </p>
          </span></font></div>
    </blockquote>
    Elastic PWs were the core subject of the previous section, so
    "mentioned" is rather too casual. I think the original was fine.<br>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <div><font face="Consolas"><span style="color: rgb(0, 0, 0);
            font-style: normal; font-weight: normal; text-decoration:
            none;">
            <p style="margin: 0px; min-height: 13px;"><br>
            </p>
            <p style="margin: 0px;">10) Section 4, 3rd paragraph:</p>
          </span><span style="color: rgb(0, 0, 0); font-style: normal;
            font-weight: normal; text-decoration: none;">
            <p style="margin: 0px;">&lt;snip&gt;</p>
            <p style="margin: 0px;">In the following we will focus on
              structure-agnostic TDM PWs</p>
            <p style="margin: 0px;">   [RFC4553] although similar
              analysis can be readily applied to</p>
            <p style="margin: 0px;">   structure-aware PWs (see Appendix
              B).</p>
            <p style="margin: 0px;">&lt;/snip&gt;</p>
            <p style="margin: 0px;">Consider replacing with:</p>
          </span></font></div>
      <div>
        <p style="margin: 0px;"><font face="Consolas">In this section We
            will focus on structure-agnostic TDM PWs</font></p>
        <p style="margin: 0px;"><font face="Consolas">   [RFC4553]
            although similar analysis can be readily applied to</font></p>
        <p style="margin: 0px;"><font face="Consolas">   structure-aware
            PWs (see Appendix B).</font></p>
      </div>
    </blockquote>
    <font face="Consolas">We did actually mean "the following", not
      "this section", because the earlier text in the section is more
      general.<br>
      <br>
      I notice the capitalisation of "We" in the middle of the sentence.
      However, we are neither royalty or deity (well, only One of us is
      ;)</font><br>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <div>
        <p style="margin: 0px; min-height: 13px;"><font face="Consolas"><br>
          </font></p>
        <p style="margin: 0px;"><font face="Consolas">11) Section 4, 3rd
            paragraph:</font></p>
        <p style="margin: 0px; min-height: 13px;"><font face="Consolas"><br>
          </font></p>
        <p style="margin: 0px;"><font face="Consolas">replace/acceptable
            TDM Service/an acceptable TDM service..</font></p>
      </div>
    </blockquote>
    <font face="Consolas">I prefer it without "an".</font><br>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <div>
        <p style="margin: 0px; min-height: 13px;"><font face="Consolas"><br>
          </font></p>
        <p style="margin: 0px;"><font face="Consolas">12) Section 4, 4th
            paragraph:</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">Also note that</font></p>
        <p style="margin: 0px;"><font face="Consolas">   being unable to
            deliver acceptable TDM service for a short amount of</font></p>
        <p style="margin: 0px;"><font face="Consolas">   time is
            insufficient justification for shutting down a TDM PW.</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;/snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">Consider replacing
            it with:</font></p>
        <p style="margin: 0px;"><font face="Consolas">Also note that</font></p>
        <p style="margin: 0px;"><font face="Consolas">   being unable to
            deliver an acceptable TDM service for a short amount of</font></p>
        <p style="margin: 0px;"><font face="Consolas">   time is an
            insufficient justification for shutting down a TDM PW.</font></p>
      </div>
    </blockquote>
    <font face="Consolas">Again, </font><font face="Consolas">I prefer
      it without "an".</font>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <div>
        <p style="margin: 0px; min-height: 13px;"><font face="Consolas"><br>
          </font></p>
        <p style="margin: 0px;"><font face="Consolas">13) Section 4, 5th
            paragraph:</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">Due to</font></p>
        <p style="margin: 0px;"><font face="Consolas">   native TDM
            services being designed with this low latency in mind,</font></p>
        <p style="margin: 0px;"><font face="Consolas">   emulated TDM
            services are usually required to have similarly low end-</font></p>
        <p style="margin: 0px;"><font face="Consolas">   to-end delay.</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;/snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">Consider replacing
            it with:</font></p>
        <p style="margin: 0px;"><font face="Consolas">Since the native
            TDM services are being designed with this low latency </font></p>
        <p style="margin: 0px;"><font face="Consolas">   in mind, the</font></p>
        <p style="margin: 0px;"><font face="Consolas">   emulated TDM
            services are also required to have similarly low end-</font></p>
        <p style="margin: 0px;"><font face="Consolas">   to-end latency.</font></p>
      </div>
    </blockquote>
    <font face="Consolas"><br>
      Drawing from both, I prefer:<br>
      Since TDM services are designed with this low latency in mind,</font>
    <p style="margin: 0px;"><font face="Consolas">   emulated TDM
        services are usually required to have similar low end-</font></p>
    <p style="margin: 0px;"><font face="Consolas">   to-end delay.<br>
        <br>
      </font></p>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <div>
        <p style="margin: 0px; min-height: 13px;"><font face="Consolas"><br>
          </font></p>
        <p style="margin: 0px;"><font face="Consolas">14) Section 4, 8th
            Paragraph:</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">Since the TDM
            rates are constant (T1 and E1</font></p>
        <p style="margin: 0px;"><font face="Consolas">   having payload
            throughputs of 1.544 Mbps and 2.048 Mbps</font></p>
        <p style="margin: 0px;"><font face="Consolas">   respectively),
            and Structure-Agnostic TDM over packet (SAToP) can</font></p>
        <p style="margin: 0px;"><font face="Consolas">   only faithfully
            emulate a TDM service up to a PLR of about half a</font></p>
        <p style="margin: 0px;"><font face="Consolas">   percent, the T1
            and E1 pseudowires occupy line segments on the graph.</font></p>
        <p style="margin: 0px;"><font face="Consolas">On the other hand,
            the TCP rate equation produces rate curves</font></p>
        <p style="margin: 0px;"><font face="Consolas">   dependent on
            both one-way delay and packet loss.</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;/snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">Consider replacing
            it with:</font></p>
      </div>
      <div>
        <p style="margin: 0px;"><font face="Consolas">Since the TDM
            rates are constant (T1 and E1</font></p>
        <p style="margin: 0px;"><font face="Consolas">   payload having
            throughputs of 1.544 Mbps and 2.048 Mbps</font></p>
        <p style="margin: 0px;"><font face="Consolas">   respectively),
            and Structure-Agnostic TDM over packet (SAToP) can</font></p>
        <p style="margin: 0px;"><font face="Consolas">   only faithfully
            emulate a TDM service up to a PLR of about half a</font></p>
        <p style="margin: 0px;"><font face="Consolas">   percent, the T1
            and E1 pseudowires occupy line segments on the graph.</font></p>
        <p style="margin: 0px;"><font face="Consolas">   On the other
            hand, the TCP rate equation produces rate curves</font></p>
        <p style="margin: 0px;"><font face="Consolas">   dependent on
            both one-way delay and the packet loss.</font></p>
      </div>
    </blockquote>
    <font face="Consolas">I prefer the original in the case of both edits:<br>
      * A payload doesn't have a throughput, but a service does have a
      payload throughput.<br>
      * One would only use 'the' with packet loss if one was referring
      to a particular packet loss figure, not packet loss as a
      parameter.<br>
    </font>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <div>
        <p style="margin: 0px; min-height: 13px;"><font face="Consolas"><br>
          </font></p>
        <p style="margin: 0px;"><font face="Consolas">15) Section 4, 9th
            paragraph:</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">Only for small
            packets,</font></p>
        <p style="margin: 0px;"><font face="Consolas">   long one-way
            delays, and high packet loss ratios, do TDM PWs</font></p>
        <p style="margin: 0px;"><font face="Consolas">   potentially
            consume more bandwidth, and even then only marginally.</font></p>
        <p style="margin: 0px;"><font face="Consolas">Further, our
            "apples to apples" comparison forced the TCP traffic to</font></p>
        <p style="margin: 0px;"><font face="Consolas">   use packets
            much smaller than would be typical.</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;/snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">Consider replacing
            it with:</font></p>
        <p style="margin: 0px;"><font face="Consolas">Only for small
            packet sizes,</font></p>
        <p style="margin: 0px;"><font face="Consolas">   long one-way
            delays, and high packet loss ratios, the TDM PWs</font></p>
        <p style="margin: 0px;"><font face="Consolas">   potentially
            consume more bandwidth, and even then only marginally.</font></p>
        <p style="margin: 0px;"><font face="Consolas">Furthermore, our
            "apples to apples" comparison forced the TCP traffic to</font></p>
        <p style="margin: 0px;"><font face="Consolas">   use much
            smaller than the typical packet size.</font></p>
      </div>
    </blockquote>
    <font face="Consolas">I don't prefer either suggested replacement.<br>
      "Only for small packets ... do PWs consume" was fine for me. But
      if you prefer I would be happy with:<br>
    </font><font face="Consolas"><font face="Consolas">For </font><font
        face="Consolas">small packets,</font><font face="Consolas"> long
        one-way delays, and high packet loss ratios, </font>TDM PWs </font><font
      face="Consolas">potentially consume more bandwidth, but only
      marginally.</font><font face="Consolas"></font>
    <blockquote cite="mid:D28B89B4.31DBA%25keyupate@cisco.com"
      type="cite">
      <div>
        <p style="margin: 0px; min-height: 13px;"><font face="Consolas"><br>
          </font></p>
        <p style="margin: 0px;"><font face="Consolas">16) Section 4,
            12th paragraph:</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">We can use the TCP
            rate equation to determine precise conditions</font></p>
        <p style="margin: 0px;"><font face="Consolas">   under which a
            TDM PW consumes no more bandwidth than a TCP flow</font></p>
        <p style="margin: 0px;"><font face="Consolas">   between the
            same endpoints would consume under identical conditions.</font></p>
        <p style="margin: 0px;"><font face="Consolas">&lt;/snip&gt;</font></p>
        <p style="margin: 0px;"><font face="Consolas">Consider replacing
            it with:</font></p>
        <p style="margin: 0px;"><font face="Consolas">We can use the TCP
            rate equation to determine precise conditions</font></p>
        <p style="margin: 0px;"><font face="Consolas">   under which a
            TDM PW consumes no more bandwidth than a TCP flow</font></p>
        <p style="margin: 0px;"><font face="Consolas">   between the
            same endpoints under identical conditions.</font></p>
      </div>
      <div style="font-size: 14px; font-family: Calibri, sans-serif;"><br>
      </div>
    </blockquote>
    That's better.<br>
    <br>
    Thank you again,<br>
    <br>
    <br>
    Bob<br>
    <br>
    <pre class="moz-signature" cols="72">-- 
________________________________________________________________
Bob Briscoe                               <a class="moz-txt-link-freetext" href="http://bobbriscoe.net/">http://bobbriscoe.net/</a></pre>
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From: Alia Atlas <akatlas@gmail.com>
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Subject: [RTG-DIR] updated WG Draft QA process on wiki
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Hi,

I've updated the https://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDirDocQa
page that describes the
WG Draft QA process and removed the excess tracking of things on wiki pages.

Please send comments if you have additional suggestions.



Thanks,
Alia

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<div dir=3D"ltr">Hi,<div><br></div><div>I&#39;ve updated the=C2=A0<a href=
=3D"https://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDirDocQa">https://tra=
c.tools.ietf.org/area/rtg/trac/wiki/RtgDirDocQa</a> page that describes the=
</div><div>WG Draft QA process and removed the excess tracking of things on=
 wiki pages.</div><div><br></div><div>Please send comments if you have addi=
tional suggestions.</div><div><br></div><div><br></div><div><br></div><div>=
Thanks,</div><div>Alia</div></div>

--001a1134f3823cfca50526e30b53--


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Subject: Re: [RTG-DIR] updated WG Draft QA process on wiki
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Excellent. Easy & quick to read.

<ramble>
Also properly frames one of the challenges

Be a known neutral party who becomes familiar with the draft.
Who can also=20

When reviewing a draft at WG Adoption, the QA Reviewer should determine whet=
her the draft solves a real problem and whether it is a good start for a WG d=
raft.=20

For many becoming knowledgeable enough in a space to determine if a real pro=
blem is being solved often results in a lack of neutrality in that space :-/=


</ramble>

Good doc, thanks

Jon

> On Dec 14, 2015, at 2:17 PM, Alia Atlas <akatlas@gmail.com> wrote:
>=20
> Hi,
>=20
> I've updated the https://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDirDocQ=
a page that describes the
> WG Draft QA process and removed the excess tracking of things on wiki page=
s.
>=20
> Please send comments if you have additional suggestions.
>=20
>=20
>=20
> Thanks,
> Alia

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div><br>Excellent. Easy &amp; quick to rea=
d.</div><div id=3D"AppleMailSignature"><br></div><div id=3D"AppleMailSignatu=
re">&lt;ramble&gt;</div><div id=3D"AppleMailSignature">Also properly frames o=
ne of the challenges</div><div id=3D"AppleMailSignature"><br></div><div id=3D=
"AppleMailSignature"><i style=3D"background-color: rgba(255, 255, 255, 0);">=
Be a known neutral party who becomes familiar with the draft.</i></div><div i=
d=3D"AppleMailSignature"><p>Who can also&nbsp;</p><blockquote><p><span style=
=3D"background-color: rgba(255, 255, 255, 0);"><i>When reviewing a draft at W=
G Adoption, the QA Reviewer should determine whether the draft solves a real=
 problem and whether it is a good start for a WG draft.&nbsp;</i></span></p>=
<p>For many becoming knowledgeable enough in a space to determine if a real p=
roblem is being solved often results in a lack of neutrality in that space :=
-/</p><p>&lt;/ramble&gt;</p><p>Good doc, thanks</p><p>Jon</p></blockquote></=
div><div>On Dec 14, 2015, at 2:17 PM, Alia Atlas &lt;<a href=3D"mailto:akatl=
as@gmail.com">akatlas@gmail.com</a>&gt; wrote:<br><br></div><blockquote type=
=3D"cite"><div><div dir=3D"ltr">Hi,<div><br></div><div>I've updated the&nbsp=
;<a href=3D"https://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDirDocQa">http=
s://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDirDocQa</a> page that describ=
es the</div><div>WG Draft QA process and removed the excess tracking of thin=
gs on wiki pages.</div><div><br></div><div>Please send comments if you have a=
dditional suggestions.</div><div><br></div><div><br></div><div><br></div><di=
v>Thanks,</div><div>Alia</div></div>
</div></blockquote></body></html>=

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Subject: Re: [RTG-DIR] Routing directorate review of draft-ietf-i2rs-problem-statement
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Hi Nabil,

Thank you very much for doing this very useful review.  I have posted
draft-ietf-i2rs-problem-statement-07 and the differences can be seen at:
https://www.ietf.org/rfcdiff?url1=3Ddraft-ietf-i2rs-problem-statement-06&ur=
l2=3Ddraft-ietf-i2rs-problem-statement-07&difftype=3D--hwdiff

I did take a number of your wording changes in.  If you can take a look at
the updated
draft, that would be useful.

Thanks,
Alia

On Mon, Jun 15, 2015 at 7:51 PM, Susan Hares <shares@ndzh.com> wrote:

> Nabil:
>
>
>
> Thank you for this review.  The I2RS chairs appreciate the careful
> review.  I think we are aligned with you that we want a fresh-updated
> draft-ietf-i2rs-problem-statement.  Alia Atlas (one of the co-author) and=
 I
> will chat within a day or so and get back to you on the nits.
>
>
>
> Sue
>
>
>
> *From:* Bitar, Nabil N [mailto:nabil.n.bitar@verizon.com]
> *Sent:* Monday, June 15, 2015 7:38 PM
> *To:* draft-ietf-i2rs-problem-statement@tools.ietf.org; rtg-dir@ietf.org
> *Cc:* rtg-ads@tools.ietf.org; BRUNGARD, DEBORAH A; Jonathan Hardwick;
> i2rs-chairs@ietf.org
> *Subject:* [RTG-DIR] Routing directorate review of
> draft-ietf-i2rs-problem-statement
>
>
>
>  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, plea=
se
> 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 Las=
t
> Call comments that you receive, and strive to resolve them through
> discussion or by updating the draft.
>
> Document: draft-ietf-i2rs-problem-statement-06.txt
>
> Reviewer: Nabil Bitar
> Review Date: 6/14/2015
> IETF LC End Date: Unknown
> Intended Status: Informational
>
> *Summary:*
>
> I have some minor concerns about this document that I think should be
> resolved before publication. The document has nits that should also be
> considered prior to publication.
>
> *Comments:*
>
> This document is intended to describe the problem that i2rs needs to
> address. The document readability can be improved by::
>
>    1. starting with the abstract, clearly and progressively stating what
>    i2rs is, the driver for the problem to be addressed, and the
>    objective/problem to be solved. Comments that address this issue are
>    aprovided.
>
> I took several of thse comments in.

>
>    1.
>    2. Clearly identifying early in the document where currently solutions
>    that seem to be addressing the problem fail. This is a key component o=
f the
>    problem statement. This is currently left ambiguous to the reader unti=
il
>    the appendix. For instance, the document may refer to the appendix ear=
ly
>    on, pointing the reader to gaps in existing interfaces for managing ro=
uting
>    information compared to the needs.
>
> Please check if this is adequately addressed.  There's a fine line betwee=
n
talking about new functionality that is useful and bashing existing and
highly successful solutions.

>
>    1.
>    2. Defining or referring to the definition of terminology used in the
>    document
>
> I added "*This document uses terminology defined in  *
*[I-D.ietf-i2rs-architecture]* in Section 2.

>
>    1.
>
> *Major Issues:*
>
> No major issues found
>
> *Minor Issues:*
>
> 1- Abstract: I suggest the addition of the following at the beginning of
> the first paragraph:
>
> Traditionally, routing systems have implemented routing and signaling
> (e.g., multiprotcol label switch) protocols to control traffic forwarding
> in a network. Route computation has been controlled by relatively static
> policies that define link cost, route cost or import and export routing
> policies. With the advent of highly dynamic data center networking,
> on-demand WAN services, dynamic policy-driven traffic steering and servic=
e
> chaining, the need for real-time security threat responsiveness via traff=
ic
> control,  and the software defined networking paradigm, the need has
> emerged to  more dynamically manage and program routing systems in order =
to
> control routing information and  traffic paths, and to extract network
> topology information and traffic statistics, among others, from routing
> systems. As modern networks continue to grow =E2=80=A6=E2=80=A6 (the rest=
 of the first
> paragraph in the abstract.
>
> 2-Abstract: second paragraph first sentence, suggest the following
> modification:
>
> In order to enable network applications to have access to and control ove=
r
> information in the internet=E2=80=99s routing system, we need a publicly =
documented
> interface specification. =E2=80=94> In order to enable network applicatio=
ns to
> access and control information in a routing system uniformly across
> implementations, we need a standard specification for the interface to th=
e
> routing system that enables such control.
>
>
>
> 3- Abstract: Second paragraph, second sentence:
>
> The interface needs to support real-time, asynchronous interactions using
> data models and encodings that are efficient and potentially different fr=
om
> those available today. =E2=80=94> The interface needs to support real-tim=
e,
> asynchronous interactions using efficient data models and  encodings that
> could be potentially different from those already defined.
>
>
>
> 4- Introduction, first sentence second line:
>
>  Flexible and dynamic control increases. =E2=80=94> flexible, scalable an=
d dynamic
> control increases.
>
>
>
> 5- Introduction, last paragraph, second sentence on page 3:
>
>
>
> This is meant to refer to an executable program of some sort that has
> access to a network, such as IP or MPLS network  =E2=80=94> This is meant=
 to refer
> to an executable program that has direct or indirect access to a network,
> such as an IP or MPLS network, in order to control routing behavior or
> extract information.
>
>
>
> 6- Section 2, 1st paragraph 1st sentence and 2nd sentence::
>
>
>
> "Managing a network of production devices running a variety of routing
> protocols involves interactions between multiple components within a
> device. Some of those components are virtual while some are physical; it
> may be desirable for many, or even all of these components to be made
> available to be managed and manipulated by applications, given that
> appropriate access, authentication and policy hurdles have been crossed."
>
>
>
> I am not sure what is the significance of virtual or physical within a
> device.
>
>
>
> Change to:
>
>
>
> Managing a network of systems running a variety of routing protocols
> and/or providing one or more additional service (e.g., forwarding,
> classification and policing, firewalling) involves interactions among
> multiple components within these systems. Some of these systems or system
> components may be virtualized, co-locqted within the same physical system
> or distributed. In all cases, it is desirable to enable network
> applications to manage and control the services provided by many, if not
> all, of these components, subject to authenticated and authorized access
> and policies.
>
>
>
> 7- section 2, middle of the first paragraph:
>
> =E2=80=9Cthe management of of only some of these component requires (note=
 missing
> =E2=80=9Cs=E2=80=9D in original text) standardization as others have alre=
ady been
> standardized.=E2=80=9D
>
>
>
> While I understand the intention, this is an ambiguous general statement
> that begs the question which components require standardization and which
> ones do not.
>
>
>
> I suggest the following wording:
>
>
>
> The i2rs working group must identify the components that need to be
> managed via i2rs and require new a standardization effort.
>
>
>
> 7- section 2, when talking about the I2RS model, I suggest that you refer
> to the terminology defined in the i2rs architecture document and define t=
he
> new terminology otherwise. Specifically, what is anI2RS client, I2RS agen=
t,
> etc.
>
>
>
> 8- section 2, the sentence before last in the first paragraph:
>
>
>
> =E2=80=9CThe I2RS client is used and controlled by one or more network
> applications; they may be co-located or the I2RS client might be part of =
a
> separate application, such as orchestration or controller.=E2=80=9D
>
>
>
> This seems to imply that an orchestrator or controller is an application,
> while each could be composed of one or more applications. In addition, wh=
at
> a controller or orchestrator is not defined in this document either
> directly or by reference. I suggest the following:
>
>
>
> The I2RS client could be integrated in a network application, or
> controlled and used by by one or more separate network applications. For
> instance, an I2RS client could be provided by a network controller or a
> network orchestration system that provides a non-I2RS interface to networ=
k
> applications, and an I2rS interface to I2RS agents on the system being
> managed.
>
>
>
> 9- Section 2 Figure 1, suggest to include in words what is within i2rs
> scope in the figure in order to make it easirer for the reader. I suggest
> the following:
>
>
>
> As depicted in Figure 1, the I2RS client and I2RS agent in a routing
> system are objects within the I2RS scope. The i2RS protocol or set of
> protocols to be defined/and or identified extend between the I2RS client
> and I2RS agent.   All other objects and interfaces in Figure 1 are outsid=
e
> the I2RS scope.
>
>
>
> 10- section 3, page 5, last sentence of the first paragraph:
>
> =E2=80=9CIn addition, by having I2RS focus initially on interfaces to the=
 RIB
> layer (e.g., RIBm LIB, multicast RIB, policy-based routing), the ability =
to
> use routing indirection allows flexibility and functionality that can=E2=
=80=99t be
> easily obtained at the forwarding layer.=E2=80=9D
>
>
>
> I am not sure what is the point you are trying to make in the last phrase
> in this sentence pertaining to the forwarding plane. Can you please
> explain? I don=E2=80=99t see it as a valid statement and therefore why it=
 is needed.
>
>
>
> 11- section 3, third paragraph:
>
>
>
> =E2=80=9C.. , there is need to configure the various routing and signalin=
g
> protocols with differing dynamic state based upon application-level polic=
y
> decisions.=E2=80=9D
>
>
>
> You are not configuring routing and signaling protocols' dynamic states,
> you are configuring policies and values for parameters that effect route
> computation/decision or routing information that goes into the RIB. If yo=
u
> agree, can you make th corresponding update.
>
>
>
> 12- section 3, third paragraph
>
>
>
> =E2=80=9CThe range desired is not available via MIB modules at the presen=
t=E2=80=9D.
>
>
>
> Can you clarify what range you are referring to and subsequently any
> reference to where it is deemed that current MIBS do not not support the
> need. I am not sure though there is need to refer to current MIBs.
>
>
>
> 13- section 4 page 5, last sentence:
>
>
>
> =E2=80=9CI2RS provides a framework =E2=80=A6=E2=80=9D =E2=80=94=E2=80=94>=
 I2RS should provide a framework =E2=80=A6..
>
>
>
> 14- section 4, page 6 1st paragraph first sentence.
>
>
>
> =E2=80=9C.. Still provide only the current active state as seen at the IG=
P layer
> and above.=E2=80=9D
>
>
>
> What are you defining by above in this context?
>
>
>
> 15- Section 4, page 6 3rd paragraph last sentence:
>
>
>
> =E2=80=9C.. the full range is not=E2=80=9D
>
>
>
> Can you give an example to illustrate?
>
>
>
> =E2=80=9Cnor has there been successfully deployed the standardized abilit=
y to
> setup the router to trigger different actions upon an events=E2=80=99 occ=
urrence so
> that a rapid reaction can be accomplished=E2=80=9D
>
>
>
> Wouldn=E2=80=99t FRR for instance be a counter example to this statement?
>
>
>
> 16- Section 5, page 7,
>
>
>
> =E2=80=9CHigh-Throughput: At a minimum, the I2RS agent and associated rou=
ter
> should be able to handle a considerable =E2=80=A6=E2=80=9D =E2=80=94> Hig=
h-Throuput: at a minimum,
> within the I2RS scope, the I2RS agent and I2RS client(s) should be able t=
o
> handle a considerable =E2=80=A6
>
>
>
> Multi-Channel: "=E2=80=A6.. Thus a single TCP session would not be a good=
 match=E2=80=9D
>
>
>
> This comes across as if you are already that TCP will always be the
> transport layer. I suggest the following change:
>
>
>
>
>
> *Nits:*
>
>    1. Section 8, security considerations: 3rd line, missing =E2=80=9C.=E2=
=80=9D after
>    section 5.
>    2. Appendix A, page 9, 4th paragraph 2nd line: =E2=80=9C=E2=80=A6., an=
d configuration
>    is The Simple Network management Protocol=E2=80=9D =E2=80=94> =E2=80=
=9C=E2=80=A6.. And configuration is the
>    simple network management protocol (SNMP)"
>
>
>    - Nits are editorial or layout items. They are things that would
>    ideally be resolved before publication to make the document more reada=
ble,
>    and may be raised now to save the RFC Editor work.
>    - Usually a reviewer will not be looking for this type of issue, but
>    may find some in the course of their review.
>    - Please try to avoid raising esoteric questions of English usage. The
>    RFC Editor will spot these, and it is not a wise use of time to discus=
s
>    these things.
>    - If you find no nits, please leave this section out.
>
>
>
> Thanks,
>
> Nabil
>
>

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<div dir=3D"ltr">Hi Nabil,<div><br></div><div>Thank you very much for doing=
 this very useful review.=C2=A0 I have posted=C2=A0</div>draft-ietf-i2rs-pr=
oblem-statement-07 and the differences can be seen at:<div><a href=3D"https=
://www.ietf.org/rfcdiff?url1=3Ddraft-ietf-i2rs-problem-statement-06&amp;url=
2=3Ddraft-ietf-i2rs-problem-statement-07&amp;difftype=3D--hwdiff">https://w=
ww.ietf.org/rfcdiff?url1=3Ddraft-ietf-i2rs-problem-statement-06&amp;url2=3D=
draft-ietf-i2rs-problem-statement-07&amp;difftype=3D--hwdiff</a><br></div><=
div><br></div><div class=3D"gmail_extra">I did take a number of your wordin=
g changes in.=C2=A0 If you can take a look at the updated</div><div class=
=3D"gmail_extra">draft, that would be useful. =C2=A0</div><div class=3D"gma=
il_extra"><br></div><div class=3D"gmail_extra">Thanks,</div><div class=3D"g=
mail_extra">Alia</div><div class=3D"gmail_extra"><br><div class=3D"gmail_qu=
ote">On Mon, Jun 15, 2015 at 7:51 PM, Susan Hares <span dir=3D"ltr">&lt;<a =
href=3D"mailto:shares@ndzh.com" target=3D"_blank">shares@ndzh.com</a>&gt;</=
span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0=
px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-le=
ft-style:solid;padding-left:1ex"><div lang=3D"EN-US" link=3D"blue" vlink=3D=
"purple"><div><p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-fam=
ily:Calibri,sans-serif;color:rgb(31,73,125)">Nabil: <u></u><u></u></span></=
p><p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p><p class=3D=
"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;co=
lor:rgb(31,73,125)">Thank you for this review.=C2=A0 The I2RS chairs apprec=
iate the careful review.=C2=A0 I think we are aligned with you that we want=
 a fresh-updated draft-ietf-i2rs-problem-statement.=C2=A0 Alia Atlas (one o=
f the co-author) and I will chat within a day or so and get back to you on =
the nits. <u></u><u></u></span></p><p class=3D"MsoNormal"><span style=3D"fo=
nt-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=
=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-size:11p=
t;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Sue <u></u><u></u></=
span></p><p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:C=
alibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p><div=
><div style=3D"border-style:solid none none;border-top-color:rgb(181,196,22=
3);border-top-width:1pt;padding:3pt 0in 0in"><p class=3D"MsoNormal"><b><spa=
n style=3D"font-size:10pt;font-family:Tahoma,sans-serif">From:</span></b><s=
pan style=3D"font-size:10pt;font-family:Tahoma,sans-serif"> Bitar, Nabil N =
[mailto:<a href=3D"mailto:nabil.n.bitar@verizon.com" target=3D"_blank">nabi=
l.n.bitar@verizon.com</a>] <br><b>Sent:</b> Monday, June 15, 2015 7:38 PM<b=
r><b>To:</b> <a href=3D"mailto:draft-ietf-i2rs-problem-statement@tools.ietf=
.org" target=3D"_blank">draft-ietf-i2rs-problem-statement@tools.ietf.org</a=
>; <a href=3D"mailto:rtg-dir@ietf.org" target=3D"_blank">rtg-dir@ietf.org</=
a><br><b>Cc:</b> <a href=3D"mailto:rtg-ads@tools.ietf.org" target=3D"_blank=
">rtg-ads@tools.ietf.org</a>; BRUNGARD, DEBORAH A; Jonathan Hardwick; <a hr=
ef=3D"mailto:i2rs-chairs@ietf.org" target=3D"_blank">i2rs-chairs@ietf.org</=
a><span class=3D""><br><b>Subject:</b> [RTG-DIR] Routing directorate review=
 of draft-ietf-i2rs-problem-statement<u></u><u></u></span></span></p></div>=
</div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><p class=3D"MsoNo=
rmal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:=
black">=C2=A0Hello,<u></u><u></u></span></p></div><div><div><div class=3D"h=
5"><p><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:=
black">I have been selected as the Routing Directorate reviewer for this dr=
aft. 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 t=
he Routing ADs. 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"><span>=E2=80=8B</span>http://trac.tools.ietf.org/area/rtg/trac/=
wiki/RtgDir</a><u></u><u></u></span></p><p><span style=3D"font-size:10.5pt;=
font-family:Calibri,sans-serif;color:black">Although these comments are pri=
marily for the use of the Routing ADs, it would be helpful if you could con=
sider them along with any other IETF Last Call comments that you receive, a=
nd strive to resolve them through discussion or by updating the draft. <u><=
/u><u></u></span></p><p><span style=3D"font-size:10.5pt;font-family:Calibri=
,sans-serif;color:black">Document:=C2=A0draft-ietf-i2rs-problem-statement-0=
6.txt<u></u><u></u></span></p><p><span style=3D"font-size:10.5pt;font-famil=
y:Calibri,sans-serif;color:black">Reviewer: Nabil Bitar<br>Review Date: 6/1=
4/2015<br>IETF LC End Date: Unknown<br>Intended Status: Informational<u></u=
><u></u></span></p><p><strong><span style=3D"font-size:10.5pt;font-family:C=
alibri,sans-serif;color:black">Summary:</span></strong><span style=3D"font-=
size:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u><u></u></spa=
n></p><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-fami=
ly:Calibri,sans-serif;color:black">I have some minor concerns about this do=
cument that I think should be resolved before publication. The document has=
 nits that should also be considered prior to publication.<u></u><u></u></s=
pan></p></div><p><strong><span style=3D"font-size:10.5pt;font-family:Calibr=
i,sans-serif;color:black">Comments:</span></strong><span style=3D"font-size=
:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u><u></u></span></=
p><p><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:b=
lack">This document is intended to describe the problem that i2rs needs to =
address. The document readability can be improved by::<u></u><u></u></span>=
</p><ol start=3D"1" type=3D"1"><li class=3D"MsoNormal" style=3D"color:black=
"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif">starting =
with the abstract, clearly and progressively stating what i2rs is, the driv=
er for the problem to be addressed, and the objective/problem to be solved.=
 Comments that address this issue are aprovided.</span></li></ol></div></di=
v></div></div></div></blockquote><div>I took several of thse comments in.=
=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-s=
tyle:solid;padding-left:1ex"><div lang=3D"EN-US" link=3D"blue" vlink=3D"pur=
ple"><div><div><div><div class=3D"h5"><ol start=3D"1" type=3D"1"><li class=
=3D"MsoNormal" style=3D"color:black"><span style=3D"font-size:10.5pt;font-f=
amily:Calibri,sans-serif"><u></u><u></u></span></li><li class=3D"MsoNormal"=
 style=3D"color:black"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif">Clearly identifying early in the document where currently solut=
ions that seem to be addressing the problem fail. This is a key component o=
f the problem statement. This is currently left ambiguous to the reader unt=
iil the appendix. For instance, the document may refer to the appendix earl=
y on, pointing the reader to gaps in existing interfaces for managing routi=
ng information compared to the needs. =C2=A0</span></li></ol></div></div></=
div></div></div></blockquote><div>Please check if this is adequately addres=
sed.=C2=A0 There&#39;s a fine line between talking about new functionality =
that is useful and bashing existing and highly successful solutions.=C2=A0<=
/div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bo=
rder-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:so=
lid;padding-left:1ex"><div lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><d=
iv><div><div><div class=3D"h5"><ol start=3D"1" type=3D"1"><li class=3D"MsoN=
ormal" style=3D"color:black"><span style=3D"font-size:10.5pt;font-family:Ca=
libri,sans-serif"><u></u><u></u></span></li><li class=3D"MsoNormal" style=
=3D"color:black"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-s=
erif">Defining or referring to the definition of terminology used in the do=
cument</span></li></ol></div></div></div></div></div></blockquote><div>I ad=
ded &quot;<strong style=3D"color:rgb(0,0,0)"><font color=3D"green">This doc=
ument uses terminology defined in =C2=A0</font></strong><strong style=3D"co=
lor:rgb(0,0,0)"><font color=3D"green">[I-D.ietf-i2rs-architecture]</font></=
strong>=C2=A0in Section 2.</div><blockquote class=3D"gmail_quote" style=3D"=
margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,20=
4,204);border-left-style:solid;padding-left:1ex"><div lang=3D"EN-US" link=
=3D"blue" vlink=3D"purple"><div><div><div class=3D"h5"><ol start=3D"1" type=
=3D"1"><li class=3D"MsoNormal" style=3D"color:black"><span style=3D"font-si=
ze:10.5pt;font-family:Calibri,sans-serif"><u></u><u></u></span></li></ol><p=
><strong><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;col=
or:black">Major Issues:</span></strong><br></p><div><p class=3D"MsoNormal">=
<span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black"=
>No major issues found<u></u><u></u></span></p></div><p><strong><span style=
=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black">Minor Issu=
es:</span></strong><span style=3D"font-size:10.5pt;font-family:Calibri,sans=
-serif;color:black"><u></u><u></u></span></p><p><span style=3D"font-size:10=
.5pt;font-family:Calibri,sans-serif;color:black">1- Abstract: I suggest the=
 addition of the following at the beginning of the first paragraph:<u></u><=
u></u></span></p><p><span style=3D"font-size:10.5pt;font-family:Calibri,san=
s-serif;color:black">Traditionally, routing systems have implemented routin=
g and signaling (e.g., multiprotcol label switch) protocols to control traf=
fic forwarding in a network. Route computation has been controlled by relat=
ively static policies that define link cost, route cost or import and expor=
t routing policies. With the advent of highly dynamic data center networkin=
g, on-demand WAN services, dynamic policy-driven traffic steering and servi=
ce chaining, the need for real-time security threat responsiveness via traf=
fic control, =C2=A0and the software defined networking paradigm, the need h=
as emerged to =C2=A0more dynamically manage and program routing systems in =
order to control routing information and =C2=A0traffic paths, and to extrac=
t network topology information and traffic statistics, among others, from r=
outing systems. As modern networks continue to grow =E2=80=A6=E2=80=A6 (the=
 rest of the first paragraph in the abstract.<u></u><u></u></span></p><div>=
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:black">2-Abstract: second paragraph first sentence, sugges=
t the following modification:<u></u><u></u></span></p></div><div><p class=
=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-ser=
if;color:black">In order to enable network applications to have access to a=
nd control over information in the internet=E2=80=99s routing system, we ne=
ed a publicly documented interface specification. =E2=80=94&gt; In order to=
 enable network applications to access and control information in a routing=
 system uniformly across implementations, we need a standard specification =
for the interface to the routing system that enables such control.=C2=A0<u>=
</u><u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font=
-size:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=C2=A0<u></=
u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.=
5pt;font-family:Calibri,sans-serif;color:black">3- Abstract: Second paragra=
ph, second sentence:<u></u><u></u></span></p></div><div><p class=3D"MsoNorm=
al"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:bl=
ack">The interface needs to support real-time, asynchronous interactions us=
ing data models and encodings that are efficient and potentially different =
from those available today. =E2=80=94&gt; The interface needs to support re=
al-time, asynchronous interactions using efficient data models and =C2=A0en=
codings that could be potentially different from those already defined. =C2=
=A0<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span style=
=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=C2=
=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-=
size:10.5pt;font-family:Calibri,sans-serif;color:black">4- Introduction, fi=
rst sentence second line:<u></u><u></u></span></p></div><div><p class=3D"Ms=
oNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;col=
or:black">=C2=A0Flexible and dynamic control increases. =E2=80=94&gt; flexi=
ble, scalable and dynamic control increases.<u></u><u></u></span></p></div>=
<div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Cal=
ibri,sans-serif;color:black"><u></u>=C2=A0<u></u></span></p></div><div><p c=
lass=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans=
-serif;color:black">5- Introduction, last paragraph, second sentence on pag=
e 3:<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span style=
=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=C2=
=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-=
size:10.5pt;font-family:Calibri,sans-serif;color:black">This is meant to re=
fer to an executable program of some sort that has access to a network, suc=
h as IP or MPLS network =C2=A0=E2=80=94&gt; This is meant to refer to an ex=
ecutable program that has direct or indirect access to a network, such as a=
n IP or MPLS network, in order to control routing behavior or extract infor=
mation.<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span sty=
le=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=
=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"fo=
nt-size:10.5pt;font-family:Calibri,sans-serif;color:black">6- Section 2, 1s=
t paragraph 1st sentence and 2nd sentence::<u></u><u></u></span></p></div><=
div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Cali=
bri,sans-serif;color:black"><u></u>=C2=A0<u></u></span></p></div><div><p cl=
ass=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-=
serif;color:black">&quot;Managing a network of production devices running a=
 variety of routing protocols involves interactions between multiple compon=
ents within a device. Some of those components are virtual while some are p=
hysical; it may be desirable for many, or even all of these components to b=
e made available to be managed and manipulated by applications, given that =
appropriate access, authentication and policy hurdles have been crossed.&qu=
ot;<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span style=
=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=C2=
=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-=
size:10.5pt;font-family:Calibri,sans-serif;color:black">I am not sure what =
is the significance of virtual or physical within a device.=C2=A0<u></u><u>=
</u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:1=
0.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=C2=A0<u></u></spa=
n></p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;fon=
t-family:Calibri,sans-serif;color:black">Change to:<u></u><u></u></span></p=
></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-fam=
ily:Calibri,sans-serif;color:black"><u></u>=C2=A0<u></u></span></p></div><d=
iv><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calib=
ri,sans-serif;color:black">Managing a network of systems running a variety =
of routing protocols and/or providing one or more additional service (e.g.,=
 forwarding, classification and policing, firewalling) involves interaction=
s among multiple components within these systems. Some of these systems or =
system components may be virtualized, co-locqted within the same physical s=
ystem or distributed. In all cases, it is desirable to enable network appli=
cations to manage and control the services provided by many, if not all, of=
 these components, subject to authenticated and authorized access and polic=
ies.<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span style=
=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=C2=
=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-=
size:10.5pt;font-family:Calibri,sans-serif;color:black">7- section 2, middl=
e of the first paragraph:<u></u><u></u></span></p></div><div><p class=3D"Ms=
oNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;col=
or:black">=E2=80=9Cthe management of of only some of these component requir=
es (note missing =E2=80=9Cs=E2=80=9D in original text) standardization as o=
thers have already been standardized.=E2=80=9D<u></u><u></u></span></p></di=
v><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:C=
alibri,sans-serif;color:black"><u></u>=C2=A0<u></u></span></p></div><div><p=
 class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sa=
ns-serif;color:black">While I understand the intention, this is an ambiguou=
s general statement that begs the question which components require standar=
dization and which ones do not.=C2=A0<u></u><u></u></span></p></div><div><p=
 class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sa=
ns-serif;color:black"><u></u>=C2=A0<u></u></span></p></div><div><p class=3D=
"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;=
color:black">I suggest the following wording:<u></u><u></u></span></p></div=
><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Ca=
libri,sans-serif;color:black"><u></u>=C2=A0<u></u></span></p></div><div><p =
class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,san=
s-serif;color:black">The i2rs working group must identify the components th=
at need to be managed via i2rs and require new a standardization effort.=C2=
=A0<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span style=
=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=C2=
=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-=
size:10.5pt;font-family:Calibri,sans-serif;color:black">7- section 2, when =
talking about the I2RS model, I suggest that you refer to the terminology d=
efined in the i2rs architecture document and define the new terminology oth=
erwise. Specifically, what is anI2RS client, I2RS agent, etc.<u></u><u></u>=
</span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5p=
t;font-family:Calibri,sans-serif;color:black"><u></u>=C2=A0<u></u></span></=
p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-fa=
mily:Calibri,sans-serif;color:black">8- section 2, the sentence before last=
 in the first paragraph:<u></u><u></u></span></p></div><div><p class=3D"Mso=
Normal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;colo=
r:black"><u></u>=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><=
span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black">=
=E2=80=9CThe I2RS client is used and controlled by one or more network appl=
ications; they may be co-located or the I2RS client might be part of a sepa=
rate application, such as orchestration or controller.=E2=80=9D<u></u><u></=
u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.=
5pt;font-family:Calibri,sans-serif;color:black"><u></u>=C2=A0<u></u></span>=
</p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-=
family:Calibri,sans-serif;color:black">This seems to imply that an orchestr=
ator or controller is an application, while each could be composed of one o=
r more applications. In addition, what a controller or orchestrator is not =
defined in this document either directly or by reference. I suggest the fol=
lowing:<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span sty=
le=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=
=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"fo=
nt-size:10.5pt;font-family:Calibri,sans-serif;color:black">The I2RS client =
could be integrated in a network application, or controlled and used by by =
one or more separate network applications. For instance, an I2RS client cou=
ld be provided by a network controller or a network orchestration system th=
at provides a non-I2RS interface to network applications, and an I2rS inter=
face to I2RS agents on the system being managed.=C2=A0<u></u><u></u></span>=
</p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-=
family:Calibri,sans-serif;color:black"><u></u>=C2=A0<u></u></span></p></div=
><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Ca=
libri,sans-serif;color:black">9- Section 2 Figure 1, suggest to include in =
words what is within i2rs scope in the figure in order to make it easirer f=
or the reader. I suggest the following:<u></u><u></u></span></p></div><div>=
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,=
sans-serif;color:black"><u></u>=C2=A0<u></u></span></p></div><div><p class=
=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-ser=
if;color:black">As depicted in Figure 1, the I2RS client and I2RS agent in =
a routing system are objects within the I2RS scope. The i2RS protocol or se=
t of protocols to be defined/and or identified extend between the I2RS clie=
nt and I2RS agent. =C2=A0 All other objects and interfaces in Figure 1 are =
outside the I2RS scope.<u></u><u></u></span></p></div><div><p class=3D"MsoN=
ormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color=
:black"><u></u>=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><s=
pan style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black">1=
0- section 3, page 5, last sentence of the first paragraph:<u></u><u></u></=
span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;=
font-family:Calibri,sans-serif;color:black">=E2=80=9CIn addition, by having=
 I2RS focus initially on interfaces to the RIB layer (e.g., RIBm LIB, multi=
cast RIB, policy-based routing), the ability to use routing indirection all=
ows flexibility and functionality that can=E2=80=99t be easily obtained at =
the forwarding layer.=E2=80=9D<u></u><u></u></span></p></div><div><p class=
=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-ser=
if;color:black"><u></u>=C2=A0<u></u></span></p></div><div><p class=3D"MsoNo=
rmal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:=
black">I am not sure what is the point you are trying to make in the last p=
hrase in this sentence pertaining to the forwarding plane. Can you please e=
xplain? I don=E2=80=99t see it as a valid statement and therefore why it is=
 needed.<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span st=
yle=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=
=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"fo=
nt-size:10.5pt;font-family:Calibri,sans-serif;color:black">11- section 3, t=
hird paragraph:<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><=
span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black">=
<u></u>=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span styl=
e=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black">=E2=80=9C=
.. , there is need to configure the various routing and signaling protocols=
 with differing dynamic state based upon application-level policy decisions=
.=E2=80=9D=C2=A0<u></u><u></u></span></p></div><div><p class=3D"MsoNormal">=
<span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black"=
><u></u>=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span sty=
le=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black">You are =
not configuring routing and signaling protocols&#39; dynamic states, you ar=
e configuring policies and values for parameters that effect route computat=
ion/decision or routing information that goes into the RIB. If you agree, c=
an you make th corresponding update.<u></u><u></u></span></p></div><div><p =
class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,san=
s-serif;color:black"><u></u>=C2=A0<u></u></span></p></div><div><p class=3D"=
MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;c=
olor:black">12- section 3, third paragraph<u></u><u></u></span></p></div><d=
iv><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calib=
ri,sans-serif;color:black"><u></u>=C2=A0<u></u></span></p></div><div><p cla=
ss=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-s=
erif;color:black">=E2=80=9CThe range desired is not available via MIB modul=
es at the present=E2=80=9D.=C2=A0<u></u><u></u></span></p></div><div><p cla=
ss=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-s=
erif;color:black"><u></u>=C2=A0<u></u></span></p></div><div><p class=3D"Mso=
Normal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;colo=
r:black">Can you clarify what range you are referring to and subsequently a=
ny reference to where it is deemed that current MIBS do not not support the=
 need. I am not sure though there is need to refer to current MIBs.<u></u><=
u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-size=
:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=C2=A0<u></u></s=
pan></p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;f=
ont-family:Calibri,sans-serif;color:black">13- section 4 page 5, last sente=
nce:<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span style=
=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=C2=
=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-=
size:10.5pt;font-family:Calibri,sans-serif;color:black">=E2=80=9CI2RS provi=
des a framework =E2=80=A6=E2=80=9D =E2=80=94=E2=80=94&gt; I2RS should provi=
de a framework =E2=80=A6..<u></u><u></u></span></p></div><div><p class=3D"M=
soNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;co=
lor:black"><u></u>=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"=
><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black=
">14- section 4, page 6 1st paragraph first sentence.<u></u><u></u></span><=
/p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-f=
amily:Calibri,sans-serif;color:black"><u></u>=C2=A0<u></u></span></p></div>=
<div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Cal=
ibri,sans-serif;color:black">=E2=80=9C.. Still provide only the current act=
ive state as seen at the IGP layer and above.=E2=80=9D<u></u><u></u></span>=
</p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-=
family:Calibri,sans-serif;color:black"><u></u>=C2=A0<u></u></span></p></div=
><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Ca=
libri,sans-serif;color:black">What are you defining by above in this contex=
t?<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D=
"font-size:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=C2=A0=
<u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-siz=
e:10.5pt;font-family:Calibri,sans-serif;color:black">15- Section 4, page 6 =
3rd paragraph last sentence:<u></u><u></u></span></p></div><div><p class=3D=
"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;=
color:black"><u></u>=C2=A0<u></u></span></p></div><div><p class=3D"MsoNorma=
l"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:bla=
ck">=E2=80=9C.. the full range is not=E2=80=9D=C2=A0<u></u><u></u></span></=
p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-fa=
mily:Calibri,sans-serif;color:black"><u></u>=C2=A0<u></u></span></p></div><=
div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Cali=
bri,sans-serif;color:black">Can you give an example to illustrate?<u></u><u=
></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:=
10.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=C2=A0<u></u></sp=
an></p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;fo=
nt-family:Calibri,sans-serif;color:black">=E2=80=9Cnor has there been succe=
ssfully deployed the standardized ability to setup the router to trigger di=
fferent actions upon an events=E2=80=99 occurrence so that a rapid reaction=
 can be accomplished=E2=80=9D<u></u><u></u></span></p></div><div><p class=
=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-ser=
if;color:black"><u></u>=C2=A0<u></u></span></p></div></div></div><div><p cl=
ass=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-=
serif;color:black">Wouldn=E2=80=99t FRR for instance be a counter example t=
o this statement?=C2=A0<u></u><u></u></span></p></div><span class=3D""><div=
><p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri=
,sans-serif;color:black"><u></u>=C2=A0<u></u></span></p></div><div><p class=
=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-ser=
if;color:black">16- Section 5, page 7,<u></u><u></u></span></p></div><div><=
p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,s=
ans-serif;color:black"><u></u>=C2=A0<u></u></span></p></div><div><p class=
=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri,sans-ser=
if;color:black">=E2=80=9CHigh-Throughput: At a minimum, the I2RS agent and =
associated router should be able to handle a considerable =E2=80=A6=E2=80=
=9D =E2=80=94&gt; High-Throuput: at a minimum, within the I2RS scope, the I=
2RS agent and I2RS client(s) should be able to handle a considerable =E2=80=
=A6<u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span style=
=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=C2=
=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-=
size:10.5pt;font-family:Calibri,sans-serif;color:black">Multi-Channel: &quo=
t;=E2=80=A6.. Thus a single TCP session would not be a good match=E2=80=9D<=
u></u><u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"fo=
nt-size:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=C2=A0<u>=
</u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:1=
0.5pt;font-family:Calibri,sans-serif;color:black">This comes across as if y=
ou are already that TCP will always be the transport layer. I suggest the f=
ollowing change:<u></u><u></u></span></p></div><div><p class=3D"MsoNormal">=
<span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black"=
><u></u>=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span sty=
le=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black"><u></u>=
=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><strong><span sty=
le=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black">Nits:</s=
pan></strong><span style=3D"font-size:10.5pt;font-family:Calibri,sans-serif=
;color:black"><u></u><u></u></span></p></div><ol start=3D"1" type=3D"1"><li=
 class=3D"MsoNormal" style=3D"color:black"><span style=3D"font-size:10.5pt;=
font-family:Calibri,sans-serif">Section 8, security considerations: 3rd lin=
e, missing =E2=80=9C.=E2=80=9D after section 5.<u></u><u></u></span></li><l=
i class=3D"MsoNormal" style=3D"color:black"><span style=3D"font-size:10.5pt=
;font-family:Calibri,sans-serif">Appendix A, page 9, 4th paragraph 2nd line=
: =E2=80=9C=E2=80=A6., and configuration is The Simple Network management P=
rotocol=E2=80=9D =E2=80=94&gt; =E2=80=9C=E2=80=A6.. And configuration is th=
e simple network management protocol (SNMP)&quot;<u></u><u></u></span></li>=
</ol><ul type=3D"disc"><li class=3D"MsoNormal" style=3D"color:black"><span =
style=3D"font-size:10.5pt;font-family:Calibri,sans-serif">Nits are editoria=
l or layout items. They are things that would ideally be resolved before pu=
blication to make the document more readable, and may be raised now to save=
 the RFC Editor work. <u></u><u></u></span></li><li class=3D"MsoNormal" sty=
le=3D"color:black"><span style=3D"font-size:10.5pt;font-family:Calibri,sans=
-serif">Usually a reviewer will not be looking for this type of issue, but =
may find some in the course of their review. <u></u><u></u></span></li><li =
class=3D"MsoNormal" style=3D"color:black"><span style=3D"font-size:10.5pt;f=
ont-family:Calibri,sans-serif">Please try to avoid raising esoteric questio=
ns of English usage. The RFC Editor will spot these, and it is not a wise u=
se of time to discuss these things. <u></u><u></u></span></li><li class=3D"=
MsoNormal" style=3D"color:black"><span style=3D"font-size:10.5pt;font-famil=
y:Calibri,sans-serif">If you find no nits, please leave this section out. <=
u></u><u></u></span></li></ul></span></div><div><p class=3D"MsoNormal"><spa=
n style=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black"><u>=
</u>=C2=A0<u></u></span></p></div><div><p class=3D"MsoNormal"><span style=
=3D"font-size:10.5pt;font-family:Calibri,sans-serif;color:black">Thanks,<u>=
</u><u></u></span></p></div><div><p class=3D"MsoNormal"><span style=3D"font=
-size:10.5pt;font-family:Calibri,sans-serif;color:black">Nabil<u></u><u></u=
></span></p></div><div><h3><span style=3D"font-size:10.5pt;font-family:Cali=
bri,sans-serif;color:black"><u></u>=C2=A0<u></u></span></h3></div></div></b=
lockquote></div><br></div></div>

--089e01176aabb0cf5f05271b14c5--


From nobody Fri Dec 18 06:22:22 2015
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From: Loa Andersson <loa@pi.nu>
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Subject: [RTG-DIR] rtg dir review of draft-ietf-l2tpext-sbfd-discriminator
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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-l2tpext-sbfd-discriminator-01.txt
Reviewer: Loa Andersson
Review Date: 2015-12-18
IETF LC End Date: date-if-known
Intended Status: Proposed Standard (ID says Standards track)

Summary:

     I have some minor concerns about this document that I think should 
be resolved before publication.

Comments:

      I have considerable problems reading the draft, first it does not
really follow RFC 7322 in some important details, also the format figure
(as I understand it) is misleading. The document need a facelift.



Major Issues:

     "No major issues found."

Minor Issues:

     Even though the nit-picking below is pretty massive, it is purely
editorial and should be fixed before going to IETF Last Call. I have
no real concerns about the technical content

Abstract:
---------
     I used often "my immediate manager" as a reference and said that
the abstract should give her/him a good idea about what the draft is
about. I don't think the abstract meet that standard. Could you please
flesh out.

     RFC 7322 says that "Similarly, the Abstract should be complete
in itself.  It will appear in isolation in publication announcements
and in the online index of RFCs." If I encounter this and is not up to
speed on l2tp and bfd, this does not give a good idea what it is about.

Abbreviations

RFC 7322 says:
    Abbreviations should be expanded in document titles and upon first
    use in the document.  The full expansion of the text should be
    followed by the abbreviation itself in parentheses.  The exception is
    an abbreviation that is so common that the readership of RFCs can be
    expected to recognize it immediately; examples include (but are not
    limited to) TCP, IP, SNMP, and HTTP.  The online list of
    abbreviations [ABBR] provides guidance.  Some cases are marginal, and
    the RFC Editor will make the final judgment, weighing obscurity
    against complexity.

The abbreviations are not expanded in title, abstract, and some other
places, nor are they "well-known".

Examples
AVP - the RFC Editor abbreviation list gives two expansions, since this
is l2tp I come to the conclusion that this is "attribute-value pair" and
not the wellknow "Audio-Visual Profile (AVP)"

S-BFD - BFD is not well-known, and S-BFD is not even in the RFC Editors
abbreviations list.

L2TPv3 - L2TP or L2TPv3 are not well-know. There is no RFC that does
not expand the abbreviation in the title.

ICRQ, ICRP, OCRQ, and OCRP are sued but not expanded, the pointer to 
where to find the expansions (RFC 3931) are nit give until the third
time the quartet is mentioned

LCCE - used but not expanded. nor well-known.
The RFC Editor abbreviations has two expansions
LCCE       - Logical Cluster Computing Environment (LCCE) or
            - L2TP Control Connection Endpoint (RFCs 3931 and 4719)
Since this is is L2TP context, it is the latter that is correct, but
since we have an ambiguity we need to expand.

Section 2

I have a problem parsing this sentence:

    This AVP is exchanged during session negotiation (ICRQ, ICRP, OCRQ,
    OCRP).

Do you mean to say

    The "S-BFD Target Discriminator ID" AVP is exchanged using the ICRQ,
    ICRP, OCRQ, and OCRP control messages during session negotiations.

Section 2.1
    There is a TBD in the first sentence of this paragraph. While I
    agree that TDB is "well-know" I prefer using [TBA by IANA],
    where TBA stands for To Be Assigned.
    If you change this you also need to change in the IANA section.

Excuse me if I don't understand this figure

                                                      No. of octets
                  +-----------------------------+
                  | Discriminator Value(s)      |     4/Discriminator
                  :                             :
                  +-----------------------------+

First I think you say that a Discriminator is 4 octets
Second there can be a variable number of discriminators per attribute
value field
The box in your figure seems to 29 bits wide, this is unorthodox.


                   0       1       2       3
                   01234567012345670123456701234567
                  +-----------------------------+
                  | Discriminator Value(s)      |
                  :                             :
                  +-----------------------------+

Is this what you mean?

                   0       1       2       3
                   01234567012345670123456701234567
                  +--------------------------------+
                  | Discriminator Value (1)        |
                  +--------------------------------+
                  :                                :
                  +--------------------------------+
                  | Discriminator Value (n-1)      |
                  +--------------------------------+
                  | Discriminator Value (n)        |
                  +--------------------------------+

Discriminator - a 4 octet value

IANA consideration

      There is a practice - which I disagree with - to assume that IANA
and readers know where to the registries. Please point it out so no
mistakes are possible.

OLD TEXT
This number space is managed by IANA as per [RFC3438].

NEW TEXT
IANA maintain a sub-registry "Message Type AVP (Attribute Type 0)
Values" in the "Control Message Attribute Value Pairs" as per
[RFC3438]. IANA is requested to assign the first free value from this
sub-registry as the Message typ AVP for "S-BFD Discriminators".


Nits:

The nits tool does only give us the date warning.

/Loa



-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64


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To: "rtg-ads@tools.ietf.org" <rtg-ads@tools.ietf.org>, rtg-dir@ietf.org, draft-ietf-l2tpext-sbfd-discriminator@ietf.org, l2tpext@ietf.org
References: <56741688.9080104@pi.nu>
From: Loa Andersson <loa@pi.nu>
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Date: Sat, 19 Dec 2015 13:54:57 +0800
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Subject: Re: [RTG-DIR] rtg dir review of draft-ietf-l2tpext-sbfd-discriminator
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Deborah, authors,

I found one more small glitch.

At most place the document says that the "S-BFD Target Discriminator
ID" AVP goes with ICRQ, ICRP, OCRQ, and OCRP.

But section 2.1. includes ICCN also.

/Loa

On 2015-12-18 22:22, Loa Andersson 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-l2tpext-sbfd-discriminator-01.txt
> Reviewer: Loa Andersson
> Review Date: 2015-12-18
> IETF LC End Date: date-if-known
> Intended Status: Proposed Standard (ID says Standards track)
>
> Summary:
>
>      I have some minor concerns about this document that I think should
> be resolved before publication.
>
> Comments:
>
>       I have considerable problems reading the draft, first it does not
> really follow RFC 7322 in some important details, also the format figure
> (as I understand it) is misleading. The document need a facelift.
>
>
>
> Major Issues:
>
>      "No major issues found."
>
> Minor Issues:
>
>      Even though the nit-picking below is pretty massive, it is purely
> editorial and should be fixed before going to IETF Last Call. I have
> no real concerns about the technical content
>
> Abstract:
> ---------
>      I used often "my immediate manager" as a reference and said that
> the abstract should give her/him a good idea about what the draft is
> about. I don't think the abstract meet that standard. Could you please
> flesh out.
>
>      RFC 7322 says that "Similarly, the Abstract should be complete
> in itself.  It will appear in isolation in publication announcements
> and in the online index of RFCs." If I encounter this and is not up to
> speed on l2tp and bfd, this does not give a good idea what it is about.
>
> Abbreviations
>
> RFC 7322 says:
>     Abbreviations should be expanded in document titles and upon first
>     use in the document.  The full expansion of the text should be
>     followed by the abbreviation itself in parentheses.  The exception is
>     an abbreviation that is so common that the readership of RFCs can be
>     expected to recognize it immediately; examples include (but are not
>     limited to) TCP, IP, SNMP, and HTTP.  The online list of
>     abbreviations [ABBR] provides guidance.  Some cases are marginal, and
>     the RFC Editor will make the final judgment, weighing obscurity
>     against complexity.
>
> The abbreviations are not expanded in title, abstract, and some other
> places, nor are they "well-known".
>
> Examples
> AVP - the RFC Editor abbreviation list gives two expansions, since this
> is l2tp I come to the conclusion that this is "attribute-value pair" and
> not the wellknow "Audio-Visual Profile (AVP)"
>
> S-BFD - BFD is not well-known, and S-BFD is not even in the RFC Editors
> abbreviations list.
>
> L2TPv3 - L2TP or L2TPv3 are not well-know. There is no RFC that does
> not expand the abbreviation in the title.
>
> ICRQ, ICRP, OCRQ, and OCRP are sued but not expanded, the pointer to
> where to find the expansions (RFC 3931) are nit give until the third
> time the quartet is mentioned
>
> LCCE - used but not expanded. nor well-known.
> The RFC Editor abbreviations has two expansions
> LCCE       - Logical Cluster Computing Environment (LCCE) or
>             - L2TP Control Connection Endpoint (RFCs 3931 and 4719)
> Since this is is L2TP context, it is the latter that is correct, but
> since we have an ambiguity we need to expand.
>
> Section 2
>
> I have a problem parsing this sentence:
>
>     This AVP is exchanged during session negotiation (ICRQ, ICRP, OCRQ,
>     OCRP).
>
> Do you mean to say
>
>     The "S-BFD Target Discriminator ID" AVP is exchanged using the ICRQ,
>     ICRP, OCRQ, and OCRP control messages during session negotiations.
>
> Section 2.1
>     There is a TBD in the first sentence of this paragraph. While I
>     agree that TDB is "well-know" I prefer using [TBA by IANA],
>     where TBA stands for To Be Assigned.
>     If you change this you also need to change in the IANA section.
>
> Excuse me if I don't understand this figure
>
>                                                       No. of octets
>                   +-----------------------------+
>                   | Discriminator Value(s)      |     4/Discriminator
>                   :                             :
>                   +-----------------------------+
>
> First I think you say that a Discriminator is 4 octets
> Second there can be a variable number of discriminators per attribute
> value field
> The box in your figure seems to 29 bits wide, this is unorthodox.
>
>
>                    0       1       2       3
>                    01234567012345670123456701234567
>                   +-----------------------------+
>                   | Discriminator Value(s)      |
>                   :                             :
>                   +-----------------------------+
>
> Is this what you mean?
>
>                    0       1       2       3
>                    01234567012345670123456701234567
>                   +--------------------------------+
>                   | Discriminator Value (1)        |
>                   +--------------------------------+
>                   :                                :
>                   +--------------------------------+
>                   | Discriminator Value (n-1)      |
>                   +--------------------------------+
>                   | Discriminator Value (n)        |
>                   +--------------------------------+
>
> Discriminator - a 4 octet value
>
> IANA consideration
>
>       There is a practice - which I disagree with - to assume that IANA
> and readers know where to the registries. Please point it out so no
> mistakes are possible.
>
> OLD TEXT
> This number space is managed by IANA as per [RFC3438].
>
> NEW TEXT
> IANA maintain a sub-registry "Message Type AVP (Attribute Type 0)
> Values" in the "Control Message Attribute Value Pairs" as per
> [RFC3438]. IANA is requested to assign the first free value from this
> sub-registry as the Message typ AVP for "S-BFD Discriminators".
>
>
> Nits:
>
> The nits tool does only give us the date warning.
>
> /Loa
>
>
>


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From: "Russ White" <7riw77@gmail.com>
To: <rtg-ads@tools.ietf.org>, <rtg-dir@ietf.org>, <trill@ietf.org>
Date: Mon, 28 Dec 2015 21:16:25 -0500
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Subject: [RTG-DIR] RtgDir review: draft-ietf-trill-irb-09.txt
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Y'all --

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-trill-irb-09.txt
Reviewer: Russ White
Review Date: 28 December 2015
Intended Status: Standard Track

I have some minor concerns about this document that I think should be =
resolved before publication.

First, in 5.2:

When a routing instance is created on an edge RBridge, the tenant ID, =
tenant Label (VLAN or FGL), tenant gateway MAC, and their correspondence =
should be set and globally advertised (see Section 7.1).

When an ingress RBridge performs inter-subnet traffic TRILL =
encapsulation, the ingress RBridge uses the Label advertised by the =
egress RBridge as the inner VLAN or FGL and uses the tenant gateway    =
MAC advertised by the egress RBridge as the Inner.MacDA. The egress =
Bridge relies on this tenant Data Label to find the local VRF instance =
for the IP forwarding process when receiving inter-subnet traffic from =
the TRILL campus. (The role of tenant Label is akin to an MPLS VPN Label =
in an MPLS IP/MPLS VPN network.) Tenant Data Labels are independently =
allocated on each edge RBridge for each routing domain.
  =20
There seems to be some confusion between the concepts of a tenant label =
and a tenant data label. Is the tenant label globally set and =
advertised, or is it locally set on a per edge RBridge basis? Is it the =
set of tenant id + tenant lable that is meant to be unique, or -- ?? =
This seems like it could use some clarification.

Second, it seems that the way this should work would be with host routes =
at layer 3. I'm not certain how a subnet route would really work given =
the ability of the operator to split a subnet across multiple flooding =
domains under multiple ToR devices. Is this correct? There doesn't seem =
to be any mention in the document.

The formatting of the document looks fine. There do not appear to be any =
downrefs. The security considerations section appears to be useful, and =
to cover the issues I could think of when reading through the doc.

:-)

Russ


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From: Manav Bhatia <manav@ionosnetworks.com>
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Cc: draft-ietf-l2tpext-sbfd-discriminator@ietf.org, l2tpext@ietf.org, "rtg-ads@tools.ietf.org" <rtg-ads@tools.ietf.org>
Subject: [RTG-DIR] RtgDir review : draft-ietf-l2tpext-sbfd-discriminator
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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-l2tpext-sbfd-discriminator-01.txt
Reviewer: Manav Bhatia
Review Date: 2015-12-31
IETF LC End Date: date-if-known
Intended Status: Proposed Standard (ID says Standards track)

Summary:

I have some minor concerns about this document that I think should be
resolved before publication.

Comments:

I have issues in general readability of the draft. There were parts that
were not very clear but that could also be because i am not very conversant
with L2TP.

Major Issues:

1. The document describes how one or more than one S-BFD descriminator can
be advertised using L2TPv3 AVP. The draft when originally written was
inline with the popular idea then, that a node MAY want to advertise more
than one S-BFD descriminator. This idea however, is losing currency since
the reason that necessitated this capability is now being questioned. Given
this, the authors might need to rewrite sections of this draft, if the
consensus is to remove the notion of advertising multiple discriminators.

Minor Issues:

1. Most of the acroynms have not been expanded and referenced.

2. The figure in the draft is not clear. I dont even want to guess how that
needs to be interpreted.

Cheers, Manav

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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 =C2=A0<a href=3D"http://trac.tools.ietf.org/are=
a/rtg/trac/wiki/RtgDir">http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDi=
r</a><br><br>Although these comments are primarily for the use of the Routi=
ng 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 throu=
gh discussion or by updating the draft.<br><br>Document: draft-ietf-l2tpext=
-sbfd-discriminator-01.txt<br>Reviewer: Manav Bhatia<br>Review Date: 2015-1=
2-31<br>IETF LC End Date: date-if-known<br>Intended Status: Proposed Standa=
rd (ID says Standards track)<br><br>Summary:<br><br>I have some minor conce=
rns about this document that I think should be resolved before publication.=
<br><div><br></div><div>Comments:</div><div><br></div><div>I have issues in=
 general readability of the draft. There were parts that were not very clea=
r but that could also be because i am not very conversant with L2TP.=C2=A0<=
/div><div><br></div><div>Major Issues:</div><div><br></div><div><div>1. The=
 document describes how one or more than one S-BFD descriminator can be adv=
ertised using L2TPv3 AVP. The draft when originally written was inline with=
 the popular idea then, that a node MAY want to advertise more than one S-B=
FD descriminator. This idea however, is losing currency since the reason th=
at necessitated this capability is now being questioned. Given this, the au=
thors might need to rewrite sections of this draft, if the consensus is to =
remove the notion of advertising multiple discriminators.</div><div><br></d=
iv><div>Minor Issues:<br></div></div><div><br></div><div><div>1. Most of th=
e acroynms have not been expanded and referenced.</div></div><div><br></div=
><div>2. The figure in the draft is not clear. I dont even want to guess ho=
w that needs to be interpreted.</div><div><br></div><div>Cheers, Manav</div=
></div>

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