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From: Donald Eastlake <d3e3e3@gmail.com>
Date: Tue, 3 Apr 2018 00:11:40 -0400
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To: "John G. Scudder" <jgs@juniper.net>
Cc: "idr@ietf. org" <idr@ietf.org>, draft-ietf-idr-ls-trill@ietf.org,  trill IETF mailing list <trill@ietf.org>, Hannes Gredler <hannes@gredler.at>,  Adrian Farrel <adrian@olddog.co.uk>
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Subject: Re: [Idr] WGLC for draft-ietf-idr-ls-trill-03
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Hi John,

Thanks for these comments, See below.

On Wed, Mar 21, 2018 at 11:32 AM, John G. Scudder <jgs@juniper.net> wrote:
> Hi All,
>
> This WGLC collected exactly one expression of support other than from
> co-authors, from zhuangyan.zhuang@huawei.com. I'm afraid we don't have
> consensus to progress the document right now, or evidence that the docume=
nt
> has received much in the way of review.
>
> I do note several problems that will need to be resolved:
>
> 1. There are six front-page authors. There should be five or fewer, see t=
he
> final bullet of
> https://trac.ietf.org/trac/idr/wiki/Checklist%20for%20writing%20a%20BGP-r=
elated%20draft

OK.

> 2. The IANA section has
>
>    IANA is requested to assign one Node Flag bit for "Layer 3 Gateway"
>    from the BGP-LS registry of BGP-LS Attribute TLVs.
>
> however, the registry BGP-LS Node Descriptor, Link Descriptor, Prefix
> Descriptor, and Attribute TLVs actually has no provision for registering =
new
> flag bits. https://tools.ietf.org/html/rfc7752#section-3.3.1.1 simply lis=
ts
> them as "Reserved for future use". Possibly address this by requesting IA=
NA
> to create the registry within the "Border Gateway Protocol - Link State
> (BGP-LS) Parameters" and allocate your bit from there. You would also hav=
e
> to make your draft update RFC 7752. I've cc'd Adrian and Hannes, the
> Designated Experts for that group of registries, in case they have furthe=
r
> comment.

Creating a registry in this document seems like the appropriate course
of action.

> 3. Not precisely a problem, but are there implementations of the draft? A=
s
> you know, if there aren't, by IDR WG convention we will stall until we do
> have some, even if we do complete a WGLC.

I am not aware of any right now.

> 4. I'd kind of prefer you remove tables 1 and 2. They aren't authoritativ=
e
> and table 1 is actually obsolete.

OK.

> 5. Section 3.3.1.1 has
>
>            +----------+----------------------------+-----------+
>            | Bit      |          Description       | Reference |
>            +----------+----------------------------+-----------+
>            | 'G'      | Layer 3 Gateway Bit        | [RFC7176] |
>            | Reserved | Reserved for future use    |           |
>            +----------+----------------------------+-----------+
>
> I think the reference must be wrong. RFC 7176 ("Transparent Interconnecti=
on
> of Lots of Links (TRILL) Use of IS-IS") doesn't include the string "gatew=
ay"
> at all, so if the ref is correct, it's at best obscure.
>
> But in any case, per #2 above, probably this is not the right table in th=
e
> right place.

I'll see what I can do to improve this.

> 6. I have read section 3.3.1.2 several times and don't understand it. Oth=
er
> than "what does it mean?" I wonder what the intent of table 6 is. It kind=
 of
> resembles the table in section 5.2 of RFC 7176? I'm confused.

I think Section 3.3.1.2 is enumerating TRILL link state information
that can be transported in BGP-LS using the opaque node attribute TLV
as of some point in time (perhaps when the -00 draft was created).
However, additional possible TRILL link state information has been
specified since [RFC7176]. In any case, I think this subsection should
be recast in a more general way and the Table 6 should probably be
eliminated.

> 7. Is this a typo?
>
>    o  Does any fixed length TLV correspond to the TLV Length field in
>       this document ?
>
> Do you mean "every"?

I believe it should be "every".

> 8. In this:
>
>          opaque TLV support the range of ISIS-TLV/SUB-TLV shown in Table
>             3,  and link TLVs support the range in Figure 8.
>
> there is no figure 8 in the document.

I think it is just trying to say that you check that items of link
state information are inside the right envelope; but, it is not very
clear and refers to Figure 8 when it probably means Table 7. I'll try
to improve it.

> 9. I don't know if the security section will fly, but then again I don't
> know if it won't. Once the doc is revised to address the above I'll ask t=
he
> Sec Dir for a review.

OK.

Thanks,
Donald
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D
 Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
 155 Beaver Street, Milford, MA 01757 USA
 d3e3e3@gmail.com

> Thanks,
>
> --John
>
>
> On Oct 19, 2017, at 3:33 PM, John Scudder <jgs@juniper.net> wrote:
>
> Hi All,
>
> An IDR working group last call has been requested for
> draft-ietf-idr-ls-trill-03. Please reply to the list with your comments. =
As
> usual note we cannot advance the draft without participation from the gro=
up.
> Please get your comments in before November 3, 2017.
>
> Authors, please confirm that any relevant IPR has been disclosed.
>
> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__tools.ietf.org_htm=
l_draft-2Dietf-2Didr-2Dls-2Dtrill-2D03&d=3DDwICAg&c=3DHAkYuh63rsuhr6Scbfh0U=
jBXeMK-ndb3voDTXcWzoCI&r=3DhLt5iDJpw7ukqICc0hoT7A&m=3DYQIHKfaMAUOrl3hLdgq6n=
w1PcXtmtpICF3XlGCVFreQ&s=3D6fwhGLRqq-HwpYC9ZJyaR60B_kl8F-1BV0Gd5B7XPl8&e=3D
>
> Thanks,
>
> --John
>
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.org_mailm=
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>
>


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Cc: "idr@ietf. org" <idr@ietf.org>, draft-ietf-idr-ls-trill@ietf.org, trill IETF mailing list <trill@ietf.org>, Hannes Gredler <hannes@gredler.at>, Adrian Farrel <adrian@olddog.co.uk>
To: Donald Eastlake <d3e3e3@gmail.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/mckZWw-kW1GuqR--iUSEpY_5niw>
Subject: Re: [Idr] WGLC for draft-ietf-idr-ls-trill-03
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--Apple-Mail=_D89D7876-7861-45E3-92AB-E654D0DA62FC
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Hi Donald,

> On Apr 3, 2018, at 12:11 AM, Donald Eastlake <d3e3e3@gmail.com> wrote:
>=20
> Thanks for these comments, See below.

Thanks for your reply. When you've issued a new version we can take it =
up again.=20

--John=

--Apple-Mail=_D89D7876-7861-45E3-92AB-E654D0DA62FC
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Hi Donald,<div class=3D""><br class=3D""><div><blockquote =
type=3D"cite" class=3D""><div class=3D"">On Apr 3, 2018, at 12:11 AM, =
Donald Eastlake &lt;<a href=3D"mailto:d3e3e3@gmail.com" =
class=3D"">d3e3e3@gmail.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">Thanks for these comments, See =
below.</span><br style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""></div></blockquote></div><br =
class=3D""></div><div class=3D"">Thanks for your reply. When you've =
issued a new version we can take it up again.&nbsp;</div><div =
class=3D""><br class=3D""></div><div class=3D"">--John</div></body></html>=

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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/lDExm-z-cm3fYAOPJyuaDjURQ1A>
Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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Hi WG,

As co-chair, I want to point out that the AD asked the WG for comments =
("I want to ask the WG to consider..."). Since Alvaro asked more than =
three months ago and nobody answered, maybe nobody has anything to say =
-- as he points out ("[After I wrote the text above=E2=80=A6] I found =
that some of the points have been discussed on the list already"), this =
topic was beaten to death in March 2017 =
(https://www.ietf.org/mail-archive/web/idr/current/msg17679.html and the =
following thread, specifically in the context of session culling which =
Alvaro brings up). Also, for reference the original WGLC all the way =
back in May 2014 is here: =
https://www.ietf.org/mail-archive/web/idr/current/msg13202.html.

However, maybe some people have just missed Alvaro's request, so if you =
have comments you want considered, please send them by April 10. I will =
follow up myself (with cu-author hat).

Thanks,

--John

> On Dec 7, 2017, at 4:11 PM, Alvaro Retana <aretana.ietf@gmail.com> =
wrote:
>=20
> Dear authors:
>=20
> I just finished reading this document =E2=80=94 I have some comments, =
please see the list below.
>=20
> I understand the intent of this document: instead of resetting a BGP =
session when a NOTIFICATION is received, use Graceful Restart; if the =
session is going to *really* be reset, then use the new Hard Reset =
sub-code.  That makes sense to me=E2=80=A6but, is that the only =
code/sub-code for which it makes sense to do a hard reset?  The =
NOTIFICATION has always had the =E2=80=9Cstigma=E2=80=9D of being =
something bad, so much that we (idr/IETF) have even worked on ways to =
reduce its use (rfc7606, for example).  I want to ask the WG to consider =
whether other code/sub-code NOTIFICATION combinations should also result =
in a hard reset.  I think there are several cases, for example:
>=20
> (1) rfc4486 (Subcodes for BGP Cease Notification Message) defines =
=E2=80=9CAdministrative Shutdown=E2=80=9D ("a BGP speaker decides to =
administratively shut down its peering with a neighbor=E2=80=9D).  It =
seems to me that the sender of this NOTIFICATION would not want to =
"follow the rules for the Receiving Speaker=E2=80=9D (as specified in =
Section 4).
>=20
> (2) rfc4486 also defines "Administrative Reset=E2=80=9D ("a BGP =
speaker decides to administratively reset the peering with a =
neighbor=E2=80=9D); no more details are provided, but that sounds like a =
hard reset to me.
>=20
> (3) =E2=80=A6there=E2=80=99s probably others...
>=20
> Having said all that, I note that Section 3.1. (Sending a Hard Reset) =
specifies the =E2=80=9Cencapsulation=E2=80=9D (for lack of a better =
word) of the real reason for the Hard Reset.  If the consensus is to go =
forward with that, and not call out other exceptions, then I think that =
the text in 3.1 should expand more on the encapsulation operation and =
the rationale for doing it this way, and the document should also =
address other recent work that recommends the use of Administrative =
Shutdown, for example draft-ietf-grow-bgp-session-culling (a BCP =
currently in the RFC Editor=E2=80=99s Queue).
>=20
> [After I wrote the text above=E2=80=A6] I found that some of the =
points have been discussed on the list already =E2=80=94 please include =
some of that discussion/analysis in the document.
>=20
>=20
> I=E2=80=99ll wait until the issue above and ones marked Major (below) =
are addressed before starting the IETF LC.
>=20
> Thanks!
>=20
> Alvaro.
>=20
>=20
>=20
> Major:
>=20
> M1. Unfortunately, rfc4724 failed to setup a registry for the Restat =
Flags (or the Flags for Address Family), which means that anyone is able =
to use the bits in there (assuming the receiver looks at them, of =
course).  Given that there are only a few bits, and to prevent =
conflicts, I would really like to see a registry set up.  This document =
is already tagged to Update rfc4724, so it seems like a good place to =
establish the registries.  [If for some reason you rather not include =
that information here, then we can take care of it elsewhere.  IOW, this =
request is not a requirement.]
>=20
>=20
> M2. Section 4.1. (Rules for the Receiving Speaker) has me a little =
confused.  Are the proposed changes contingent to setting the N bit?  =
The text starts by saying: "As part of this extension, routes from the =
peer previously marked as stale MUST NOT be deleted, until and unless =
the optional timer=E2=80=A6expires=E2=80=A6=E2=80=9D=E2=80=A6does that =
mean that the timer is no longer optional?   Then you also say: =E2=80=9C.=
..if the Graceful Notification ("N") bit is not set in the newly =
received Graceful Restart Capability, no new actions are triggered on =
the Receiving Speaker -- in particular, a clear "N=E2=80=9D bit does not =
trigger deletion of stale routes.=E2=80=9D  If I understand rfc4724 =
correctly, stale routes could be deleted =E2=80=94 the text indicates =
changes in the behavior even if the N bit is not set, right?  If you are =
Updating this section of rfc4724, what would make it crystal clear is an =
=E2=80=9COLD/NEW=E2=80=9D notation of the text (as in, this is the OLD =
text=E2=80=A6and this is the NEW text=E2=80=A6).
>=20
>=20
> M3. Security Considerations:  Maybe not a security issue, but =
something to think about.  Section 4.1 says that =E2=80=9Croutes...previou=
sly marked as stale MUST NOT be deleted, until and unless the optional =
timer...expires, or unless a Hard Reset is performed.  This supersedes =
the =E2=80=9Cconsecutive restarts=E2=80=9D requirement=E2=80=A6=E2=80=9D. =
 Not deleting the stale routes and not making the timer mandatory could =
result in stale routes that live forever if an attacker manages to =
create consecutive restarts (by simply sending NOTIFICATIONS before EoR) =
=E2=80=94 stale routes are ok in the short term, but may point in the =
wrong direction eventually.  Is this an issue?  I think that it would be =
mitigated if the timer was made mandatory (with a nice default).
>=20
>=20
>=20
> Minor:
>=20
> P1. Section 4: =E2=80=9C...receive and send BGP NOTIFICATION messages =
in Graceful mode...=E2=80=9D What is =E2=80=9CGraceful mode=E2=80=9D?
>=20
>=20
>=20
> Nits:
>=20
> N1. In Section 2, please indicate that the first figure corresponds to =
the GR Capability from rfc4724.
>=20
> N2. s/subcode is defined known as/subcode is defined as
>=20
> N3. s/Graceful Notification flag/Graceful Notification bit   (For =
consistency)
>=20
> N4. The operation is obviously per-AF; maybe it=E2=80=99s worth saying =
that somewhere just for completeness.


--Apple-Mail=_144961DE-722E-44BD-9D37-3B0C4F776424
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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""><div dir=3D"auto" style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Hi WG,</div><div dir=3D"auto" style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><br class=3D""></div><div dir=3D"auto" style=3D"word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;" class=3D"">As co-chair, I want to point out that the =
AD asked the WG for comments ("I want to ask the WG to consider..."). =
Since Alvaro asked more than three months ago and nobody answered, maybe =
nobody has anything to say -- as he points out ("[After I wrote the text =
above=E2=80=A6] I found that some of the points have been discussed on =
the list already"), this topic was beaten to death in March 2017 (<a =
href=3D"https://www.ietf.org/mail-archive/web/idr/current/msg17679.html" =
class=3D"">https://www.ietf.org/mail-archive/web/idr/current/msg17679.html=
</a> and the following thread, specifically in the context of session =
culling which Alvaro brings up). Also, for reference the original WGLC =
all the way back in May 2014 is here: <a =
href=3D"https://www.ietf.org/mail-archive/web/idr/current/msg13202.html" =
class=3D"">https://www.ietf.org/mail-archive/web/idr/current/msg13202.html=
</a>.</div><div dir=3D"auto" style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><br class=3D""></div><div dir=3D"auto" style=3D"word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;" class=3D"">However, maybe some people have just =
missed Alvaro's request, so if you have comments you want considered, =
please send them by April 10. I will follow up myself (with cu-author =
hat).</div><div dir=3D"auto" style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><br class=3D""></div><div dir=3D"auto" style=3D"word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;" class=3D"">Thanks,</div><div dir=3D"auto" =
style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space;" class=3D""><br =
class=3D""></div><div dir=3D"auto" style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">--John</div><div dir=3D"auto" style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><br class=3D""></div><div dir=3D"auto" style=3D"word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;" class=3D""><div><blockquote type=3D"cite" =
class=3D""><div class=3D"">On Dec 7, 2017, at 4:11 PM, Alvaro Retana =
&lt;<a href=3D"mailto:aretana.ietf@gmail.com" =
class=3D"">aretana.ietf@gmail.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" class=3D""><div =
class=3D""></div><div class=3D""><font face=3D"Helvetica" class=3D"">Dear =
authors:</font></div><div class=3D""><font face=3D"Helvetica" =
class=3D""><br class=3D""></font></div><div class=3D""><font =
face=3D"Helvetica" class=3D"">I just finished reading this =
document&nbsp;=E2=80=94 I have&nbsp;some comments, please see the list =
below.</font></div><div class=3D""><font face=3D"Helvetica" class=3D""><br=
 class=3D""></font></div><div class=3D""><font face=3D"Helvetica" =
class=3D"">I understand the intent of this document: instead of =
resetting a BGP session when a NOTIFICATION is received, use Graceful =
Restart; if the session is going to *really* be reset, then use the new =
Hard Reset sub-code.&nbsp; That makes sense to me=E2=80=A6but, is that =
the only code/sub-code for which it makes sense to do a hard =
reset?&nbsp; The NOTIFICATION has always had the&nbsp;=E2=80=9Cstigma=E2=80=
=9D of being something bad, so much that we (idr/IETF) have even worked =
on ways to reduce its use (rfc7606, for example).&nbsp; I want to ask =
the WG to consider whether other code/sub-code NOTIFICATION combinations =
should also result in a hard reset.&nbsp; I think there are several =
cases, for example:</font></div><div class=3D""><font face=3D"Helvetica" =
class=3D""><br class=3D""></font></div><div class=3D""><font =
face=3D"Helvetica" class=3D"">(1)&nbsp;rfc4486 (Subcodes for BGP Cease =
Notification Message) defines&nbsp;=E2=80=9CAdministrative Shutdown=E2=80=9D=
 ("a BGP speaker decides to administratively shut down its peering with =
a neighbor=E2=80=9D).&nbsp; It seems to me that the sender of this =
NOTIFICATION would not want to "follow the rules for the Receiving =
Speaker=E2=80=9D (as specified in Section 4).</font></div><div =
class=3D""><font face=3D"Helvetica" class=3D""><br =
class=3D""></font></div><div class=3D""><font face=3D"Helvetica" =
class=3D"">(2) rfc4486 also defines "Administrative Reset=E2=80=9D =
("</font>a BGP speaker decides to administratively reset the peering =
with a neighbor=E2=80=9D); no more details are provided, but that sounds =
like a hard reset to me.</div><div class=3D""><br class=3D""></div><div =
class=3D"">(3) =E2=80=A6there=E2=80=99s probably others...</div><div =
class=3D""><br class=3D""></div><div class=3D"">Having said all that, I =
note that Section&nbsp;3.1. (Sending a Hard Reset) specifies the =
=E2=80=9Cencapsulation=E2=80=9D (for lack of a better word) of the real =
reason for the Hard Reset.&nbsp; If the consensus is to go forward with =
that, and not call out other exceptions, then I think that the text in =
3.1 should expand more on the encapsulation operation and the rationale =
for doing it this way, and the document should also address other recent =
work that recommends the use of Administrative Shutdown, for example =
draft-ietf-grow-bgp-session-culling (a BCP currently in the RFC =
Editor=E2=80=99s Queue).</div><div class=3D""><br class=3D""></div><div =
class=3D"">[After I wrote the text above=E2=80=A6] I found that some of =
the points have been discussed on the list already =E2=80=94 please =
include some of that discussion/analysis in the document.</div><div =
class=3D""><br class=3D""></div><div class=3D""><br class=3D""></div><div =
class=3D"">I=E2=80=99ll wait until the issue above and ones marked Major =
(below) are addressed before starting the IETF LC.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Thanks!</div><div =
class=3D""><br class=3D""></div><div class=3D"">Alvaro.</div><div =
class=3D""><br class=3D""></div><div class=3D""><br class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D""><span =
style=3D"font-family:Helvetica" class=3D"">Major:</span></div><div =
class=3D""><div class=3D""><font face=3D"Helvetica" class=3D""><br =
class=3D""></font></div>
<div class=3D""><font face=3D"Helvetica" class=3D"">M1. Unfortunately, =
rfc4724 failed to setup a registry for the
Restat Flags (or the Flags for Address Family), which means that
anyone is able to use the bits in there (assuming the receiver
looks at them, of course).&nbsp; Given that there are only a few
bits, and to prevent conflicts, I would really like to see a
registry set up.&nbsp; This document is already tagged to Update
rfc4724, so it seems like a good place to establish the registries.
&nbsp;[If for some reason you rather not include that information
here, then we can take care of it elsewhere.&nbsp; IOW, this
request is not a requirement.]</font></div><div class=3D""><font =
face=3D"Helvetica" class=3D""><br class=3D""></font></div><div =
class=3D""><pre class=3D"newpage" =
style=3D"margin-top:0px;margin-bottom:0px"><font face=3D"Helvetica" =
class=3D""><br class=3D""></font></pre><pre class=3D"newpage" =
style=3D"margin-top:0px;margin-bottom:0px"><font face=3D"Helvetica" =
class=3D"">M2. Section 4.1. (Rules for the Receiving Speaker) has me a =
little confused.  Are the proposed changes contingent to setting the N =
bit?  The text starts by saying: "</font><span =
style=3D"font-family:Helvetica" class=3D"">As part of this extension, =
routes from the peer previously marked as </span><span =
style=3D"font-family:Helvetica" class=3D"">stale MUST NOT be deleted, =
until and unless the optional timer</span><font face=3D"Helvetica" =
class=3D"">=E2=80=A6expires=E2=80=A6=E2=80=9D=E2=80=A6does that mean =
that the timer is no longer optional?   Then you also say: =
=E2=80=9C...</font><span style=3D"font-family:Helvetica" class=3D"">if =
the Graceful Notification ("N") bit is not set </span><span =
style=3D"font-family:Helvetica" class=3D"">in the newly received =
Graceful Restart Capability, no new actions are </span><font =
face=3D"Helvetica" class=3D"">triggered on the Receiving Speaker -- in =
particular, a clear "N=E2=80=9D bit does not trigger deletion of stale =
routes.=E2=80=9D  If I understand rfc4724 correctly, stale routes could =
be deleted =E2=80=94 the text indicates changes in the behavior even if =
the N bit is not set, right?  If you are Updating this section of =
rfc4724, what would make it crystal clear is an =E2=80=9COLD/NEW=E2=80=9D =
notation of the text (as in, this is the OLD text=E2=80=A6and this is =
the NEW text=E2=80=A6).</font></pre><pre class=3D"newpage" =
style=3D"margin-top:0px;margin-bottom:0px"><font face=3D"Helvetica" =
class=3D""><br class=3D""></font></pre><pre class=3D"newpage" =
style=3D"margin-top:0px;margin-bottom:0px"><font face=3D"Helvetica" =
class=3D""><br class=3D""></font></pre><pre class=3D"newpage" =
style=3D"margin-top:0px;margin-bottom:0px"><font face=3D"Helvetica" =
class=3D"">M3. Security Considerations:  Maybe not a security issue, but =
something to think about.  Section 4.1 says that =E2=80=9Croutes...previou=
sly marked as stale MUST NOT be deleted, until and unless the optional =
timer...expires, or unless a Hard Reset is performed.  This supersedes =
the =E2=80=9Cconsecutive restarts=E2=80=9D requirement=E2=80=A6=E2=80=9D. =
 Not deleting the stale routes and not making the timer mandatory could =
result in stale routes that live forever if an attacker manages to =
create consecutive restarts (by simply sending NOTIFICATIONS before EoR) =
=E2=80=94 stale routes are ok in the short term, but may point in the =
wrong direction eventually.  Is this an issue?  I think that it would be =
mitigated if the timer was made mandatory (with a nice =
default).</font></pre><pre class=3D"newpage" =
style=3D"margin-top:0px;margin-bottom:0px"><br class=3D""></pre><pre =
class=3D"newpage" style=3D"margin-top:0px;margin-bottom:0px"><br =
class=3D""></pre></div>
<div class=3D""><font face=3D"Helvetica" class=3D""><br =
class=3D""></font></div>
<div class=3D""><font face=3D"Helvetica" class=3D"">Minor:</font></div>
<div class=3D""><font face=3D"Helvetica" class=3D""><br =
class=3D""></font></div>
<div class=3D""><pre class=3D"newpage" =
style=3D"margin-top:0px;margin-bottom:0px"><font face=3D"Helvetica" =
class=3D"">P1. </font><span style=3D"font-family:Helvetica" =
class=3D"">Section 4: </span><span style=3D"font-family:Helvetica" =
class=3D"">=E2=80=9C...</span><span style=3D"font-family:Helvetica" =
class=3D"">receive and send BGP NOTIFICATION </span><span =
style=3D"font-family:Helvetica" class=3D"">messages in Graceful =
mode...=E2=80=9D What is =E2=80=9CGraceful mode=E2=80=9D?</span></pre>
<pre class=3D"newpage" style=3D"margin-top:0px;margin-bottom:0px"><font =
face=3D"Helvetica" class=3D""><br class=3D""></font></pre><pre =
class=3D"newpage" style=3D"margin-top:0px;margin-bottom:0px"><br =
class=3D""></pre>
<div class=3D""><font face=3D"Helvetica" class=3D""><br =
class=3D""></font></div><div class=3D""><font face=3D"Helvetica" =
class=3D"">Nits:
</font><div class=3D""><font face=3D"Helvetica" class=3D""><br =
class=3D""></font></div>
<div class=3D""><font face=3D"Helvetica" class=3D"">N1. In Section 2, =
please indicate that the first figure
corresponds to the GR Capability from rfc4724.</font></div>
<div class=3D""><font face=3D"Helvetica" class=3D""><br =
class=3D""></font></div>
<div class=3D""><font face=3D"Helvetica" class=3D"">N2. s/subcode
is defined known as/subcode
is defined as</font></div>
<div class=3D""><font face=3D"Helvetica" class=3D"">
<br class=3D""></font></div>
<div class=3D""><font face=3D"Helvetica" class=3D"">N3. s/Graceful =
Notification flag/Graceful Notification bit &nbsp; (For
consistency)</font></div><div class=3D""><font face=3D"Helvetica" =
class=3D""><br class=3D""></font></div><div class=3D""><font =
face=3D"Helvetica" class=3D"">N4. The operation is obviously per-AF; =
maybe it=E2=80=99s worth saying that somewhere just for =
completeness.</font></div>
</div>
</div>


</div></div>
</div></blockquote></div><br class=3D""></div></body></html>=

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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/soRtuaVRqjJgpFzgHWin0udw7pU>
Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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(with co-author hat)

Hi Alvaro,

> On Dec 7, 2017, at 4:11 PM, Alvaro Retana <aretana.ietf@gmail.com> =
wrote:
>=20
> Dear authors:
>=20
> I just finished reading this document =E2=80=94 I have some comments, =
please see the list below.
>=20
> I understand the intent of this document: instead of resetting a BGP =
session when a NOTIFICATION is received, use Graceful Restart; if the =
session is going to *really* be reset, then use the new Hard Reset =
sub-code.  That makes sense to me=E2=80=A6but, is that the only =
code/sub-code for which it makes sense to do a hard reset?  The =
NOTIFICATION has always had the =E2=80=9Cstigma=E2=80=9D of being =
something bad, so much that we (idr/IETF) have even worked on ways to =
reduce its use (rfc7606, for example).  I want to ask the WG to consider =
whether other code/sub-code NOTIFICATION combinations should also result =
in a hard reset.  I think there are several cases, for example:
>=20
> (1) rfc4486 (Subcodes for BGP Cease Notification Message) defines =
=E2=80=9CAdministrative Shutdown=E2=80=9D ("a BGP speaker decides to =
administratively shut down its peering with a neighbor=E2=80=9D).  It =
seems to me that the sender of this NOTIFICATION would not want to =
"follow the rules for the Receiving Speaker=E2=80=9D (as specified in =
Section 4).
>=20
> (2) rfc4486 also defines "Administrative Reset=E2=80=9D ("a BGP =
speaker decides to administratively reset the peering with a =
neighbor=E2=80=9D); no more details are provided, but that sounds like a =
hard reset to me.
>=20
> (3) =E2=80=A6there=E2=80=99s probably others...
>=20
> Having said all that, I note that Section 3.1. (Sending a Hard Reset) =
specifies the =E2=80=9Cencapsulation=E2=80=9D (for lack of a better =
word) of the real reason for the Hard Reset.  If the consensus is to go =
forward with that, and not call out other exceptions, then I think that =
the text in 3.1 should expand more on the encapsulation operation and =
the rationale for doing it this way, and the document should also =
address other recent work that recommends the use of Administrative =
Shutdown, for example draft-ietf-grow-bgp-session-culling (a BCP =
currently in the RFC Editor=E2=80=99s Queue).
>=20
> [After I wrote the text above=E2=80=A6] I found that some of the =
points have been discussed on the list already =E2=80=94 please include =
some of that discussion/analysis in the document.

I'll draft something and we can discuss.

Just FYI, the encoding in question was adopted in version -03 as a =
result of Chris Hall's comments during the WGLC way back in the day =
(https://www.ietf.org/mail-archive/web/idr/current/msg13205.html)

> I=E2=80=99ll wait until the issue above and ones marked Major (below) =
are addressed before starting the IETF LC.
>=20
> Thanks!
>=20
> Alvaro.
>=20
>=20
>=20
> Major:
>=20
> M1. Unfortunately, rfc4724 failed to setup a registry for the Restat =
Flags (or the Flags for Address Family), which means that anyone is able =
to use the bits in there (assuming the receiver looks at them, of =
course).  Given that there are only a few bits, and to prevent =
conflicts, I would really like to see a registry set up.  This document =
is already tagged to Update rfc4724, so it seems like a good place to =
establish the registries.  [If for some reason you rather not include =
that information here, then we can take care of it elsewhere.  IOW, this =
request is not a requirement.]

I'll do this and while I'm at it, set one up for Flags for Address =
Family too.

> M2. Section 4.1. (Rules for the Receiving Speaker) has me a little =
confused.  Are the proposed changes contingent to setting the N bit? =20

No.

> The text starts by saying: "As part of this extension, routes from the =
peer previously marked as stale MUST NOT be deleted, until and unless =
the optional timer=E2=80=A6expires=E2=80=A6=E2=80=9D=E2=80=A6does that =
mean that the timer is no longer optional?  =20

No, it's just that we foolishly didn't give the timer a name in the base =
GR spec. Here's the paragraph from RFC 4272:

   To put an upper bound on the amount of time a router retains the
   stale routes, an implementation MAY support a (configurable) timer
   that imposes this upper bound.

In practice, all implementations have this and call it something like =
'stale timer' or whatever. The lack of a defined name for this thing =
makes it a pain to write about it, which I think is what you've bumped =
into here. I'll propose a replacement in OLD/NEW style.

> Then you also say: =E2=80=9C...if the Graceful Notification ("N") bit =
is not set in the newly received Graceful Restart Capability, no new =
actions are triggered on the Receiving Speaker -- in particular, a clear =
"N=E2=80=9D bit does not trigger deletion of stale routes.=E2=80=9D  If =
I understand rfc4724 correctly, stale routes could be deleted =E2=80=94 =
the text indicates changes in the behavior even if the N bit is not set, =
right?  If you are Updating this section of rfc4724, what would make it =
crystal clear is an =E2=80=9COLD/NEW=E2=80=9D notation of the text (as =
in, this is the OLD text=E2=80=A6and this is the NEW text=E2=80=A6).

Oh ouch, I see why you were confused. I believe we meant F bit, not N =
bit. I'll propose a replacement in OLD/NEW style.

> M3. Security Considerations:  Maybe not a security issue, but =
something to think about.  Section 4.1 says that =E2=80=9Croutes...previou=
sly marked as stale MUST NOT be deleted, until and unless the optional =
timer...expires, or unless a Hard Reset is performed.  This supersedes =
the =E2=80=9Cconsecutive restarts=E2=80=9D requirement=E2=80=A6=E2=80=9D. =
 Not deleting the stale routes and not making the timer mandatory could =
result in stale routes that live forever if an attacker manages to =
create consecutive restarts (by simply sending NOTIFICATIONS before EoR) =
=E2=80=94 stale routes are ok in the short term, but may point in the =
wrong direction eventually.  Is this an issue?  I think that it would be =
mitigated if the timer was made mandatory (with a nice default).

That seems like a good idea. While we're at it, we can give it a name.=20=


> Minor:
>=20
> P1. Section 4: =E2=80=9C...receive and send BGP NOTIFICATION messages =
in Graceful mode...=E2=80=9D What is =E2=80=9CGraceful mode=E2=80=9D?

Changed to "according to the procedures of this document".

> Nits:
>=20
> N1. In Section 2, please indicate that the first figure corresponds to =
the GR Capability from rfc4724.

Actually unless someone objects I'll remove the figure entirely. I'm not =
sure why we put it in. It's not like this document stands alone anyway.

> N2. s/subcode is defined known as/subcode is defined as

OK

> N3. s/Graceful Notification flag/Graceful Notification bit   (For =
consistency)

OK

> N4. The operation is obviously per-AF; maybe it=E2=80=99s worth saying =
that somewhere just for completeness.

I don't think I agree -- the extension is NOT per-AF, it applies to all =
AFs for which GR is enabled (that's why the N flag goes in the Restart =
Flags field and not the Flags for Address Family field). The underlying =
operation of GR continues to be per-AF, it's true, but that's not =
affected by this spec so I think it might be confusing to add words =
about it?

Thanks,

--John=


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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Aijun Wang <wangaijun@tsinghua.org.cn>
CC: "lsr@ietf.org" <lsr@ietf.org>, "idr@ietf.org" <idr@ietf.org>, Jeffrey Haas <jhaas@pfrc.org>
Thread-Topic: [Lsr] Inconsistence regarding the definition of "Adj-SID Sub-TLV" between OSPF and ISIS extension for Segment Routing
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Date: Wed, 4 Apr 2018 07:54:03 +0000
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References: <008101d3ca60$073f81b0$15be8510$@org.cn> <c5a4d1de5e7943318821018c138b5562@XCH-ALN-008.cisco.com> <1B346347-9242-4EE4-BDA2-F024EF483B8A@tsinghua.org.cn> <aab65c5b06d346d2a5a4ef8cef5ad28b@XCH-ALN-008.cisco.com> <8C26288C-54C3-4C04-91A6-2B99562A1DE9@cisco.com> <5AC32E8B.6090202@cisco.com> <CF9450C5-028B-4B29-9F3A-137254AFF320@previdi.net> <009b01d3cbbb$6bfc3510$43f49f30$@org.cn>
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Subject: Re: [Idr] [Lsr] Inconsistence regarding the definition of "Adj-SID Sub-TLV" between OSPF and ISIS extension for Segment Routing
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On Apr 3, 2018, at 5:02 PM, John G. Scudder <jgs@juniper.net> wrote:
>=20
>> Then you also say: =E2=80=9C...if the Graceful Notification ("N") bit =
is not set in the newly received Graceful Restart Capability, no new =
actions are triggered on the Receiving Speaker -- in particular, a clear =
"N=E2=80=9D bit does not trigger deletion of stale routes.=E2=80=9D  If =
I understand rfc4724 correctly, stale routes could be deleted =E2=80=94 =
the text indicates changes in the behavior even if the N bit is not set, =
right?  If you are Updating this section of rfc4724, what would make it =
crystal clear is an =E2=80=9COLD/NEW=E2=80=9D notation of the text (as =
in, this is the OLD text=E2=80=A6and this is the NEW text=E2=80=A6).
>=20
> Oh ouch, I see why you were confused. I believe we meant F bit, not N =
bit. I'll propose a replacement in OLD/NEW style.

Upon further consideration, I think the text was correct -- but =
confusing -- as written. I'll work on clarifying but won't change N to =
F. I believe the intent was to say "If the new session doesn't advertise =
the N bit, implementors shouldn't assume any special semantics other =
than 'gr-notification is no longer in effect'." One might argue this was =
an attempt to say "don't write bugs", so one solution would be to =
completely remove the offending paragraph if it can't be clarified =
acceptably.

--John=

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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"">On Apr 3, 2018, at 5:02 PM, John G. Scudder &lt;<a =
href=3D"mailto:jgs@juniper.net" class=3D"">jgs@juniper.net</a>&gt; =
wrote:<br class=3D""><div><blockquote type=3D"cite" class=3D""><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D""><blockquote type=3D"cite" style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: 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-size-adjust: auto; =
-webkit-text-stroke-width: 0px;" class=3D"">Then you also say: =E2=80=9C..=
.if the Graceful Notification ("N") bit is not set in the newly received =
Graceful Restart Capability, no new actions are triggered on the =
Receiving Speaker -- in particular, a clear "N=E2=80=9D bit does not =
trigger deletion of stale routes.=E2=80=9D &nbsp;If I understand rfc4724 =
correctly, stale routes could be deleted =E2=80=94 the text indicates =
changes in the behavior even if the N bit is not set, right? &nbsp;If =
you are Updating this section of rfc4724, what would make it crystal =
clear is an =E2=80=9COLD/NEW=E2=80=9D notation of the text (as in, this =
is the OLD text=E2=80=A6and this is the NEW text=E2=80=A6).<br =
class=3D""></blockquote><br style=3D"font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><span style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: =
inline !important;" class=3D"">Oh ouch, I see why you were confused. I =
believe we meant F bit, not N bit. I'll propose a replacement in OLD/NEW =
style.</span><br style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" =
class=3D""></div></div></blockquote></div><br class=3D""><div =
class=3D"">Upon further consideration, I think the text was correct -- =
but confusing -- as written. I'll work on clarifying but won't change N =
to F. I believe the intent was to say "If the new session doesn't =
advertise the N bit, implementors shouldn't assume any special semantics =
other than 'gr-notification is no longer in effect'." One might argue =
this was an attempt to say "don't write bugs", so one solution would be =
to completely remove the offending paragraph if it can't be clarified =
acceptably.</div><div class=3D""><br class=3D""></div><div =
class=3D"">--John</div></body></html>=

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Cc: Alvaro Retana <aretana.ietf@gmail.com>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "draft-ietf-idr-bgp-gr-notification@ietf.org" <draft-ietf-idr-bgp-gr-notification@ietf.org>,  "idr@ietf. org" <idr@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/T9FFFbBdhvHb1fKCGcVqyJfy_xs>
Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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(co-author hat)

Hi Bruno,

Thanks for your comments. I found them quite helpful, especially your =
restatement of Alvaro's point.

Now that I've had a few days of thinking about the question, I do =
actually have one motivation to offer for the way it's currently =
specced:

If we didn't have the Hard Reset notification, and relied on enumerating =
for each notification type (code + subcode) what reset semantics it =
should have, then whenever a new notification type was introduced, the =
spec author would have to define the semantics. But, the receiving =
implementation wouldn't necessarily know what the desired semantics =
were, because of the usual problem with introduction of new =
capabilities. So it would have to go with a default semantics, which =
might be wrong. To work around this we'd have to introduce some kind of =
encapsulation to indicate desired semantics... and presto, we have just =
reinvented Hard Reset. So this is a kind of proof by contradiction that =
we need the existing design.

It's true that we could specify both options -- Hard Reset (necessity =
argued above), plus specified semantics for existing ("legacy") =
notification types, but I've never been a fan of having two different =
code paths where one will do, especially when the one is what's already =
implemented.

One thing this discussion does make me think, is that it might be worth =
adding some advice to implementors to the spec, for which notification =
types should always be wrapped up in a Hard Reset.=20

Regards,

--John

> On Apr 4, 2018, at 4:58 AM, bruno.decraene@orange.com wrote:
>=20
> Hi John, Alvaro, WG,
> =20
> Please find below a few comments (FWIW):
> =20
> - First I do support this specification to move forward.
> =20
> - Second this document has passed WGLC a long time ago, is technically =
valid (i.e. not flawed) and has at least 2 implementations
> =
https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-bgp-gr-notification%20i=
mplementations =
<https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__trac.ietf.org_trac=
_idr_wiki_draft-2Dietf-2Didr-2Dbgp-2Dgr-2Dnotification-2520implementations=
&d=3DDwMGaQ&c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=3DhLt5iDJpw7=
ukqICc0hoT7A&m=3DLyyR87durQ_2Tdcp3v7xkJS4vNZCrnDFW44Eq4OeloU&s=3Dydo2omG1m=
Rwd74ILAzDnNIN_GN_fWZe_4KBqxNA8R1U&e=3D>
> So it feels like a bit harsh to make non compatible change at this =
time.
> (OTOH if we do a WGLC once we have 2 implementations, WGLC is never a =
good time to make technical changes to the document. So when is the good =
time?)
> =20
> - Third, Alvaro=E2=80=99s comment seems legitimate.
> I retrospect, may be this mechanism could (should?) have been applied =
only to error codes (i.e. all but the CEASE code). This would align with =
the motivation indicated in the introduction section. Alternatively, =
this could be defined on a per sub-code basis. As noted by Alvaro, using =
GR for some CEASE subcodes seem to never make sense. (I would add =
=E2=80=9CPeer De-configured=E2=80=9D)
> =20
> Also, from a management standpoint, the error code is now dependent on =
dynamic session parameters (the setting of the =E2=80=9CN=E2=80=9D bit =
in the GR open capability) which makes it harder to track.
> =20
> In all cases, I would welcome section 3.1 to indicate which Error Code =
and Sub code are to be indicated in log, syslog, yang models, SNMP =
data=E2=80=A6 The ones in the =E2=80=9CData=E2=80=9D field (i.e. the =
true reason) or the ones sent in the Notification (cease, hard reset) ? =
This would avoid non-interoperable operational behaviors.
> =20
> =20
> So no definite answer; but answer nonetheless, as requested.
> =20
> Regards,
> --Bruno
> =20
> =20
> From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of John G. Scudder
> Sent: Tuesday, April 03, 2018 10:03 PM
> To: Alvaro Retana; idr@ietf. org
> Cc: idr-chairs@ietf.org; draft-ietf-idr-bgp-gr-notification@ietf.org
> Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
> =20
> Hi WG,
> =20
> As co-chair, I want to point out that the AD asked the WG for comments =
("I want to ask the WG to consider..."). Since Alvaro asked more than =
three months ago and nobody answered, maybe nobody has anything to say =
-- as he points out ("[After I wrote the text above=E2=80=A6] I found =
that some of the points have been discussed on the list already"), this =
topic was beaten to death in March 2017 =
(https://www.ietf.org/mail-archive/web/idr/current/msg17679.html =
<https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.org_mail-=
2Darchive_web_idr_current_msg17679.html&d=3DDwMGaQ&c=3DHAkYuh63rsuhr6Scbfh=
0UjBXeMK-ndb3voDTXcWzoCI&r=3DhLt5iDJpw7ukqICc0hoT7A&m=3DLyyR87durQ_2Tdcp3v=
7xkJS4vNZCrnDFW44Eq4OeloU&s=3Djb6RyqGP3OGGQpKD0qizvkoIIyzy9bAU-9CcZnYCOv0&=
e=3D> and the following thread, specifically in the context of session =
culling which Alvaro brings up). Also, for reference the original WGLC =
all the way back in May 2014 is here: =
https://www.ietf.org/mail-archive/web/idr/current/msg13202.html =
<https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.org_mail-=
2Darchive_web_idr_current_msg13202.html&d=3DDwMGaQ&c=3DHAkYuh63rsuhr6Scbfh=
0UjBXeMK-ndb3voDTXcWzoCI&r=3DhLt5iDJpw7ukqICc0hoT7A&m=3DLyyR87durQ_2Tdcp3v=
7xkJS4vNZCrnDFW44Eq4OeloU&s=3DUM7yPXKLgDGANq0olGiItLwXTmgw_p6JuNx0uELOltM&=
e=3D>.
> =20
> However, maybe some people have just missed Alvaro's request, so if =
you have comments you want considered, please send them by April 10. I =
will follow up myself (with cu-author hat).
> =20
> Thanks,
> =20
> --John
> =20
> On Dec 7, 2017, at 4:11 PM, Alvaro Retana <aretana.ietf@gmail.com =
<mailto:aretana.ietf@gmail.com>> wrote:
> =20
> Dear authors:
> =20
> I just finished reading this document =E2=80=94 I have some comments, =
please see the list below.
> =20
> I understand the intent of this document: instead of resetting a BGP =
session when a NOTIFICATION is received, use Graceful Restart; if the =
session is going to *really* be reset, then use the new Hard Reset =
sub-code.  That makes sense to me=E2=80=A6but, is that the only =
code/sub-code for which it makes sense to do a hard reset?  The =
NOTIFICATION has always had the =E2=80=9Cstigma=E2=80=9D of being =
something bad, so much that we (idr/IETF) have even worked on ways to =
reduce its use (rfc7606, for example).  I want to ask the WG to consider =
whether other code/sub-code NOTIFICATION combinations should also result =
in a hard reset.  I think there are several cases, for example:
> =20
> (1) rfc4486 (Subcodes for BGP Cease Notification Message) defines =
=E2=80=9CAdministrative Shutdown=E2=80=9D ("a BGP speaker decides to =
administratively shut down its peering with a neighbor=E2=80=9D).  It =
seems to me that the sender of this NOTIFICATION would not want to =
"follow the rules for the Receiving Speaker=E2=80=9D (as specified in =
Section 4).
> =20
> (2) rfc4486 also defines "Administrative Reset=E2=80=9D ("a BGP =
speaker decides to administratively reset the peering with a =
neighbor=E2=80=9D); no more details are provided, but that sounds like a =
hard reset to me.
> =20
> (3) =E2=80=A6there=E2=80=99s probably others...
> =20
> Having said all that, I note that Section 3.1. (Sending a Hard Reset) =
specifies the =E2=80=9Cencapsulation=E2=80=9D (for lack of a better =
word) of the real reason for the Hard Reset.  If the consensus is to go =
forward with that, and not call out other exceptions, then I think that =
the text in 3.1 should expand more on the encapsulation operation and =
the rationale for doing it this way, and the document should also =
address other recent work that recommends the use of Administrative =
Shutdown, for example draft-ietf-grow-bgp-session-culling (a BCP =
currently in the RFC Editor=E2=80=99s Queue).
> =20
> [After I wrote the text above=E2=80=A6] I found that some of the =
points have been discussed on the list already =E2=80=94 please include =
some of that discussion/analysis in the document.
> =20
> =20
> I=E2=80=99ll wait until the issue above and ones marked Major (below) =
are addressed before starting the IETF LC.
> =20
> Thanks!
> =20
> Alvaro.
> =20
> =20
> =20
> Major:
> =20
> M1. Unfortunately, rfc4724 failed to setup a registry for the Restat =
Flags (or the Flags for Address Family), which means that anyone is able =
to use the bits in there (assuming the receiver looks at them, of =
course).  Given that there are only a few bits, and to prevent =
conflicts, I would really like to see a registry set up.  This document =
is already tagged to Update rfc4724, so it seems like a good place to =
establish the registries.  [If for some reason you rather not include =
that information here, then we can take care of it elsewhere.  IOW, this =
request is not a requirement.]
> =20
> =20
> M2. Section 4.1. (Rules for the Receiving Speaker) has me a little =
confused.  Are the proposed changes contingent to setting the N bit?  =
The text starts by saying: "As part of this extension, routes from the =
peer previously marked as stale MUST NOT be deleted, until and unless =
the optional timer=E2=80=A6expires=E2=80=A6=E2=80=9D=E2=80=A6does that =
mean that the timer is no longer optional?   Then you also say: =E2=80=9C.=
..if the Graceful Notification ("N") bit is not set in the newly =
received Graceful Restart Capability, no new actions are triggered on =
the Receiving Speaker -- in particular, a clear "N=E2=80=9D bit does not =
trigger deletion of stale routes.=E2=80=9D  If I understand rfc4724 =
correctly, stale routes could be deleted =E2=80=94 the text indicates =
changes in the behavior even if the N bit is not set, right?  If you are =
Updating this section of rfc4724, what would make it crystal clear is an =
=E2=80=9COLD/NEW=E2=80=9D notation of the text (as in, this is the OLD =
text=E2=80=A6and this is the NEW text=E2=80=A6).
> =20
> =20
> M3. Security Considerations:  Maybe not a security issue, but =
something to think about.  Section 4.1 says that =E2=80=9Croutes...previou=
sly marked as stale MUST NOT be deleted, until and unless the optional =
timer...expires, or unless a Hard Reset is performed.  This supersedes =
the =E2=80=9Cconsecutive restarts=E2=80=9D requirement=E2=80=A6=E2=80=9D. =
 Not deleting the stale routes and not making the timer mandatory could =
result in stale routes that live forever if an attacker manages to =
create consecutive restarts (by simply sending NOTIFICATIONS before EoR) =
=E2=80=94 stale routes are ok in the short term, but may point in the =
wrong direction eventually.  Is this an issue?  I think that it would be =
mitigated if the timer was made mandatory (with a nice default).
> =20
> =20
> =20
> Minor:
> =20
> P1. Section 4: =E2=80=9C...receive and send BGP NOTIFICATION messages =
in Graceful mode...=E2=80=9D What is =E2=80=9CGraceful mode=E2=80=9D?
> =20
> =20
> =20
> Nits:=20
> =20
> N1. In Section 2, please indicate that the first figure corresponds to =
the GR Capability from rfc4724.
> =20
> N2. s/subcode is defined known as/subcode is defined as
> =20
> N3. s/Graceful Notification flag/Graceful Notification bit   (For =
consistency)
> =20
> N4. The operation is obviously per-AF; maybe it=E2=80=99s worth saying =
that somewhere just for completeness.
> =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"">(co-author hat)<div class=3D""><br class=3D""></div><div =
class=3D"">Hi Bruno,</div><div class=3D""><br class=3D""></div><div =
class=3D"">Thanks for your comments. I found them quite helpful, =
especially your restatement of Alvaro's point.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Now that I've had a few days of =
thinking about the question, I do actually have one motivation to offer =
for the way it's currently specced:</div><div class=3D""><br =
class=3D""></div><div class=3D"">If we didn't have the Hard Reset =
notification, and relied on enumerating for each notification type (code =
+ subcode) what reset semantics it should have, then whenever a new =
notification type was introduced, the spec author would have to define =
the semantics. But, the receiving implementation wouldn't necessarily =
know what the desired semantics were, because of the usual problem with =
introduction of new capabilities. So it would have to go with a default =
semantics, which might be wrong. To work around this we'd have to =
introduce some kind of encapsulation to indicate desired semantics... =
and presto, we have just reinvented Hard Reset. So this is a kind of =
proof by contradiction that we need the existing design.</div><div =
class=3D""><br class=3D""></div><div class=3D"">It's true that we could =
specify both options -- Hard Reset (necessity argued above), plus =
specified semantics for existing ("legacy") notification types, but I've =
never been a fan of having two different code paths where one will do, =
especially when the one is what's already implemented.</div><div =
class=3D""><br class=3D""></div><div class=3D"">One thing this =
discussion does make me think, is that it might be worth adding some =
advice to implementors to the spec, for which notification types should =
always be wrapped up in a Hard Reset.&nbsp;</div><div class=3D""><br =
class=3D""></div><div class=3D"">Regards,</div><div class=3D""><br =
class=3D""></div><div class=3D"">--John</div><div class=3D""><br =
class=3D""></div><div class=3D""><div><blockquote type=3D"cite" =
class=3D""><div class=3D"">On Apr 4, 2018, at 4:58 AM, <a =
href=3D"mailto:bruno.decraene@orange.com" =
class=3D"">bruno.decraene@orange.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-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">Hi John, Alvaro, WG,<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;" class=3D""><span =
style=3D"font-size: 10pt; font-family: Arial, sans-serif;" 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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">Please find below a few comments =
(FWIW):<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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" 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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">- First I do support this specification =
to move forward.<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;" 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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">- Second this document has passed WGLC a =
long time ago, is technically valid (i.e. not flawed) and has at least 2 =
implementations<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;" class=3D""><a =
href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__trac.ietf.o=
rg_trac_idr_wiki_draft-2Dietf-2Didr-2Dbgp-2Dgr-2Dnotification-2520implemen=
tations&amp;d=3DDwMGaQ&amp;c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI=
&amp;r=3DhLt5iDJpw7ukqICc0hoT7A&amp;m=3DLyyR87durQ_2Tdcp3v7xkJS4vNZCrnDFW4=
4Eq4OeloU&amp;s=3Dydo2omG1mRwd74ILAzDnNIN_GN_fWZe_4KBqxNA8R1U&amp;e=3D" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-bgp-gr-notif=
ication%20implementations</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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D"">So it feels like a bit =
harsh to make non compatible change at this time.<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;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">(OTOH if we do a WGLC once we have 2 =
implementations, WGLC is never a good time to make technical changes to =
the document. So when is the good time?)<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;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" 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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D"">- Third, Alvaro=E2=80=99=
s comment seems legitimate.<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D"">I retrospect, may be =
this mechanism could (should?) have been applied only to error codes =
(i.e. all but the CEASE code). This would align with the motivation =
indicated in the introduction section. Alternatively, this could be =
defined on a per sub-code basis. As noted by Alvaro, using GR for some =
CEASE subcodes seem to never make sense. (I would add =E2=80=9C</span><spa=
n lang=3D"EN-US" class=3D"">Peer De-configured=E2=80=9D)</span><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D""><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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" 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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">Also, from a management standpoint, the =
error code is now dependent on dynamic session parameters (the setting =
of the =E2=80=9CN=E2=80=9D bit in the GR open capability) which makes it =
harder to track.<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;" 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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">In all cases, I would welcome section 3.1 =
to indicate which Error Code and Sub code are to be indicated in log, =
syslog, yang models, SNMP data=E2=80=A6 The ones in the =E2=80=9CData=E2=80=
=9D field (i.e. the true reason) or the ones sent in the Notification =
(cease, hard reset) ? This would avoid non-interoperable operational =
behaviors.<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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" 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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" 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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">So no definite answer; but answer =
nonetheless, as requested.<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" 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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">Regards,<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;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">--Bruno<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" 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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"border-style: none =
none none solid; border-left-width: 1.5pt; border-left-color: blue; =
padding: 0cm 0cm 0cm 4pt;" class=3D""><div class=3D""><div =
style=3D"border-style: solid none none; border-top-width: 1pt; =
border-top-color: rgb(181, 196, 223); padding: 3pt 0cm 0cm;" =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><b class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Tahoma, =
sans-serif;" class=3D"">From:</span></b><span lang=3D"EN-US" =
style=3D"font-size: 10pt; font-family: Tahoma, sans-serif;" =
class=3D""><span class=3D"Apple-converted-space">&nbsp;</span>Idr [<a =
href=3D"mailto:idr-bounces@ietf.org" =
class=3D"">mailto:idr-bounces@ietf.org</a>]<span =
class=3D"Apple-converted-space">&nbsp;</span><b class=3D"">On Behalf =
Of<span class=3D"Apple-converted-space">&nbsp;</span></b>John G. =
Scudder<br class=3D""><b class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Tuesday, April 03, 2018 =
10:03 PM<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Alvaro Retana;<span =
class=3D"Apple-converted-space">&nbsp;</span></span><span =
style=3D"font-size: 10pt; font-family: Tahoma, sans-serif;" =
class=3D"">idr@ietf. org<br class=3D""><b class=3D"">Cc:</b><span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:idr-chairs@ietf.org" class=3D"">idr-chairs@ietf.org</a>; =
<a href=3D"mailto:draft-ietf-idr-bgp-gr-notification@ietf.org" =
class=3D"">draft-ietf-idr-bgp-gr-notification@ietf.org</a><br =
class=3D""><b class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Re: [Idr] AD Review of =
draft-ietf-idr-bgp-gr-notification-13<o:p =
class=3D""></o:p></span></div></div></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Hi WG,<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">As co-chair, I want to point out that the =
AD asked the WG for comments ("I want to ask the WG to consider..."). =
Since Alvaro asked more than three months ago and nobody answered, maybe =
nobody has anything to say -- as he points out ("[After I wrote the text =
above=E2=80=A6] I found that some of the points have been discussed on =
the list already"), this topic was beaten to death in March 2017 (<a =
href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.or=
g_mail-2Darchive_web_idr_current_msg17679.html&amp;d=3DDwMGaQ&amp;c=3DHAkY=
uh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=3DhLt5iDJpw7ukqICc0hoT7A&amp=
;m=3DLyyR87durQ_2Tdcp3v7xkJS4vNZCrnDFW44Eq4OeloU&amp;s=3Djb6RyqGP3OGGQpKD0=
qizvkoIIyzy9bAU-9CcZnYCOv0&amp;e=3D" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">https://www.ietf.org/mail-archive/web/idr/current/msg17679.html=
</a><span class=3D"Apple-converted-space">&nbsp;</span>and the following =
thread, specifically in the context of session culling which Alvaro =
brings up). Also, for reference the original WGLC all the way back in =
May 2014 is here:<span class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.or=
g_mail-2Darchive_web_idr_current_msg13202.html&amp;d=3DDwMGaQ&amp;c=3DHAkY=
uh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=3DhLt5iDJpw7ukqICc0hoT7A&amp=
;m=3DLyyR87durQ_2Tdcp3v7xkJS4vNZCrnDFW44Eq4OeloU&amp;s=3DUM7yPXKLgDGANq0ol=
GiItLwXTmgw_p6JuNx0uELOltM&amp;e=3D" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">https://www.ietf.org/mail-archive/web/idr/current/msg13202.html=
</a>.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">However, maybe some people have just missed Alvaro's =
request, so if you have comments you want considered, please send them =
by April 10. I will follow up myself (with cu-author hat).<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Thanks,<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">--John<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
class=3D""><blockquote style=3D"margin-top: 5pt; margin-bottom: 5pt;" =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D"">On =
Dec 7, 2017, at 4:11 PM, Alvaro Retana &lt;<a =
href=3D"mailto:aretana.ietf@gmail.com" style=3D"color: purple; =
text-decoration: underline;" class=3D"">aretana.ietf@gmail.com</a>&gt; =
wrote:<o:p class=3D""></o:p></div></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-family: Helvetica, sans-serif;" class=3D"">Dear =
authors:</span><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-family: Helvetica, sans-serif;" =
class=3D"">I just finished reading this document&nbsp;=E2=80=94 I =
have&nbsp;some comments, please see the list below.</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-family: Helvetica, =
sans-serif;" class=3D"">I understand the intent of this document: =
instead of resetting a BGP session when a NOTIFICATION is received, use =
Graceful Restart; if the session is going to *really* be reset, then use =
the new Hard Reset sub-code.&nbsp; That makes sense to me=E2=80=A6but, =
is that the only code/sub-code for which it makes sense to do a hard =
reset?&nbsp; The NOTIFICATION has always had the&nbsp;=E2=80=9Cstigma=E2=80=
=9D of being something bad, so much that we (idr/IETF) have even worked =
on ways to reduce its use (rfc7606, for example).&nbsp; I want to ask =
the WG to consider whether other code/sub-code NOTIFICATION combinations =
should also result in a hard reset.&nbsp; I think there are several =
cases, for example:</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-family: Helvetica, sans-serif;" =
class=3D"">(1)&nbsp;rfc4486 (Subcodes for BGP Cease Notification =
Message) defines&nbsp;=E2=80=9CAdministrative Shutdown=E2=80=9D ("a BGP =
speaker decides to administratively shut down its peering with a =
neighbor=E2=80=9D).&nbsp; It seems to me that the sender of this =
NOTIFICATION would not want to "follow the rules for the Receiving =
Speaker=E2=80=9D (as specified in Section 4).</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-family: Helvetica, =
sans-serif;" class=3D"">(2) rfc4486 also defines "Administrative =
Reset=E2=80=9D ("</span>a BGP speaker decides to administratively reset =
the peering with a neighbor=E2=80=9D); no more details are provided, but =
that sounds like a hard reset to me.<o:p class=3D""></o:p></div></div><div=
 class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">(3) =E2=80=A6there=E2=80=99s probably others...<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Having said all that, I note that =
Section&nbsp;3.1. (Sending a Hard Reset) specifies the =
=E2=80=9Cencapsulation=E2=80=9D (for lack of a better word) of the real =
reason for the Hard Reset.&nbsp; If the consensus is to go forward with =
that, and not call out other exceptions, then I think that the text in =
3.1 should expand more on the encapsulation operation and the rationale =
for doing it this way, and the document should also address other recent =
work that recommends the use of Administrative Shutdown, for example =
draft-ietf-grow-bgp-session-culling (a BCP currently in the RFC =
Editor=E2=80=99s Queue).<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">[After I wrote the text above=E2=80=A6] I found that =
some of the points have been discussed on the list already =E2=80=94 =
please include some of that discussion/analysis in the document.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">I=E2=80=99ll wait until the issue above and ones =
marked Major (below) are addressed before starting the IETF LC.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Thanks!<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Alvaro.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-family: Helvetica, sans-serif;" class=3D"">Major:</span><o:p=
 class=3D""></o:p></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-family: Helvetica, sans-serif;" =
class=3D"">M1. Unfortunately, rfc4724 failed to setup a registry for the =
Restat Flags (or the Flags for Address Family), which means that anyone =
is able to use the bits in there (assuming the receiver looks at them, =
of course).&nbsp; Given that there are only a few bits, and to prevent =
conflicts, I would really like to see a registry set up.&nbsp; This =
document is already tagged to Update rfc4724, so it seems like a good =
place to establish the registries. &nbsp;[If for some reason you rather =
not include that information here, then we can take care of it =
elsewhere.&nbsp; IOW, this request is not a requirement.]</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><pre =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: =
'Courier New';" class=3D""><o:p class=3D"">&nbsp;</o:p></pre><pre =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: =
'Courier New';" class=3D""><span style=3D"font-family: Helvetica, =
sans-serif;" class=3D"">M2. Section 4.1. (Rules for the Receiving =
Speaker) has me a little confused.&nbsp; Are the proposed changes =
contingent to setting the N bit?&nbsp; The text starts by saying: "As =
part of this extension, routes from the peer previously marked as stale =
MUST NOT be deleted, until and unless the optional =
timer=E2=80=A6expires=E2=80=A6=E2=80=9D=E2=80=A6does that mean that the =
timer is no longer optional?&nbsp;&nbsp; Then you also say: =E2=80=9C...if=
 the Graceful Notification ("N") bit is not set in the newly received =
Graceful Restart Capability, no new actions are triggered on the =
Receiving Speaker -- in particular, a clear "N=E2=80=9D bit does not =
trigger deletion of stale routes.=E2=80=9D&nbsp; If I understand rfc4724 =
correctly, stale routes could be deleted =E2=80=94 the text indicates =
changes in the behavior even if the N bit is not set, right?&nbsp; If =
you are Updating this section of rfc4724, what would make it crystal =
clear is an =E2=80=9COLD/NEW=E2=80=9D notation of the text (as in, this =
is the OLD text=E2=80=A6and this is the NEW text=E2=80=A6).</span><o:p =
class=3D""></o:p></pre><pre style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 10pt; font-family: 'Courier New';" class=3D""><o:p =
class=3D"">&nbsp;</o:p></pre><pre style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 10pt; font-family: 'Courier New';" class=3D""><o:p =
class=3D"">&nbsp;</o:p></pre><pre style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 10pt; font-family: 'Courier New';" class=3D""><span =
style=3D"font-family: Helvetica, sans-serif;" class=3D"">M3. Security =
Considerations:&nbsp; Maybe not a security issue, but something to think =
about.&nbsp; Section 4.1 says that =E2=80=9Croutes...previously marked =
as stale MUST NOT be deleted, until and unless the optional =
timer...expires, or unless a Hard Reset is performed.&nbsp; This =
supersedes the =E2=80=9Cconsecutive restarts=E2=80=9D =
requirement=E2=80=A6=E2=80=9D.&nbsp; Not deleting the stale routes and =
not making the timer mandatory could result in stale routes that live =
forever if an attacker manages to create consecutive restarts (by simply =
sending NOTIFICATIONS before EoR) =E2=80=94 stale routes are ok in the =
short term, but may point in the wrong direction eventually.&nbsp; Is =
this an issue?&nbsp; I think that it would be mitigated if the timer was =
made mandatory (with a nice default).</span><o:p =
class=3D""></o:p></pre><pre style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 10pt; font-family: 'Courier New';" class=3D""><o:p =
class=3D"">&nbsp;</o:p></pre><pre style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 10pt; font-family: 'Courier New';" class=3D""><o:p =
class=3D"">&nbsp;</o:p></pre></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-family: Helvetica, sans-serif;" class=3D"">Minor:</span><o:p=
 class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><pre =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: =
'Courier New';" class=3D""><span style=3D"font-family: Helvetica, =
sans-serif;" class=3D"">P1. Section 4: =E2=80=9C...receive and send BGP =
NOTIFICATION messages in Graceful mode...=E2=80=9D What is =E2=80=9CGracef=
ul mode=E2=80=9D?</span><o:p class=3D""></o:p></pre><pre style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 10pt; font-family: 'Courier New';" =
class=3D""><o:p class=3D"">&nbsp;</o:p></pre><pre style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 10pt; font-family: 'Courier New';" =
class=3D""><o:p class=3D"">&nbsp;</o:p></pre><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-family: Helvetica, sans-serif;" =
class=3D"">Nits:<span =
class=3D"Apple-converted-space">&nbsp;</span></span><o:p =
class=3D""></o:p></div><div class=3D""><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-family: Helvetica, =
sans-serif;" class=3D"">N1. In Section 2, please indicate that the first =
figure corresponds to the GR Capability from rfc4724.</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-family: Helvetica, =
sans-serif;" class=3D"">N2. s/subcode is defined known as/subcode is =
defined as</span><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-family: Helvetica, sans-serif;" =
class=3D"">N3. s/Graceful Notification flag/Graceful Notification bit =
&nbsp; (For consistency)</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-family: Helvetica, sans-serif;" =
class=3D"">N4. The operation is obviously per-AF; maybe it=E2=80=99s =
worth saying that somewhere just for completeness.</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></blockquote></=
div><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div></div></div><pre style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 10pt; font-family: 'Courier New'; font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-align: start; text-indent: 0px; text-transform: none; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D"">_______________________________________________________________=
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/MJKySBX49msEWAZQ_PszkJyT_Ps>
Subject: [Idr] early allocations for draft-ietf-idr-bgp-open-policy complete
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Hi All,

Early allocations for draft-ietf-idr-bgp-open-policy have been =
completed:

Capability Codes registry:
9	BGP Role (TEMPORARY - registered 2018-03-29, expires 2019-03-29)	=
[draft-ietf-idr-bgp-open-policy]

BGP Path Attributes registry:
35	Internal Only To Customer (TEMPORARY - registered 2018-03-29, =
expires 2019-03-29)	[draft-ietf-idr-bgp-open-policy]

OPEN Message Error subcodes registry:
8	Role Mismatch (TEMPORARY - registered 2018-03-29, expires =
2019-03-29)	[draft-ietf-idr-bgp-open-policy]

--John=20=


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From: <bruno.decraene@orange.com>
To: "John G. Scudder" <jgs@juniper.net>, Alvaro Retana <aretana.ietf@gmail.com>, "draft-ietf-idr-bgp-gr-notification@ietf.org" <draft-ietf-idr-bgp-gr-notification@ietf.org>, "draft-snijders-idr-rfc8203bis@ietf.org" <draft-snijders-idr-rfc8203bis@ietf.org>
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Thread-Topic: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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Date: Fri, 6 Apr 2018 08:55:01 +0000
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CC: Alvaro Retana <aretana.ietf@gmail.com>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "draft-ietf-idr-bgp-gr-notification@ietf.org" <draft-ietf-idr-bgp-gr-notification@ietf.org>, "idr@ietf. org" <idr@ietf.org>
Thread-Topic: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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Date: Fri, 6 Apr 2018 08:55:07 +0000
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Thread-Topic: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/HU9az7wBnzgjQYKBoaf58KPoRgg>
Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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Hi Bruno

No comments on your a/b/c options which as you point out would be more =
applicable if we had a clean sheet instead of existing implementations. =
A few other remarks below.

> On Apr 6, 2018, at 4:55 AM, bruno.decraene@orange.com wrote:
>=20
>> It's true that we could specify both options -- Hard Reset (necessity =
argued above), plus specified semantics for existing ("legacy") =
notification types, but I've never been a fan of having two different =
code paths where one will do, especially when the one is what's already =
implemented.
> =20
> [Bruno] IMHO, the introduction of the Hard Reset encapsulation already =
introduces the 2 code paths ( [Code, subcode] , [Cease, Hard Reset, =
Code, subcode]) and the question is only about the behavior for each =
path.

Sorry, I meant "two code paths to achieve the same semantics".
=20
>> One thing this discussion does make me think, is that it might be =
worth adding some advice to implementors to the spec, for which =
notification types should always be wrapped up in a Hard Reset.=20
> [Bruno] If =E2=80=9Cshould always=E2=80=9D translates as =E2=80=9CMUST=E2=
=80=9D then the draft needs to also specify the error handling when the =
original signaling is sent.

I meant "should always" in a much weaker sense, and the draft language I =
have in my edit buffer (hopefully) makes that clear. I think it should =
be an implementation choice when to send a hard reset vs. a regular one =
(maybe we should call the latter a "graceful" reset), but it does seem =
useful to offer guidance to implementors when we have something useful =
to say.

I'll share a proposed revision once I've finished coming up to date with =
the mail thread.

Thanks,

--John=

--Apple-Mail=_1EF8248A-BA63-4E30-8945-8A18D8E0FAEC
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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"">Hi Bruno<div class=3D""><br class=3D""></div><div class=3D"">No=
 comments on your a/b/c options which as you point out would be more =
applicable if we had a clean sheet instead of existing implementations. =
A few other remarks below.</div><div class=3D""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
Apr 6, 2018, at 4:55 AM, <a href=3D"mailto:bruno.decraene@orange.com" =
class=3D"">bruno.decraene@orange.com</a> wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""></div></div><blockquote type=3D"cite" =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D"">It's =
true that we could specify both options -- Hard Reset (necessity argued =
above), plus specified semantics for existing ("legacy") notification =
types, but I've never been a fan of having two different code paths =
where one will do, especially when the one is what's already =
implemented.<o:p class=3D""></o:p></div></div></blockquote><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 10pt; font-family: Arial, sans-serif;" 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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">[Bruno] IMHO, the introduction of the =
Hard Reset encapsulation already introduces the 2 code paths<span =
class=3D"Apple-converted-space">&nbsp;</span></span><span lang=3D"EN-US" =
style=3D"font-size: 10pt; font-family: Arial, sans-serif;" class=3D"">( =
[Code, subcode] , [Cease, Hard Reset, Code, subcode]) and the question =
is only about the behavior for each =
path.</span></div></div></div></blockquote><div><br =
class=3D""></div>Sorry, I meant "two code paths to achieve the same =
semantics".</div><div><span style=3D"font-family: Arial, sans-serif; =
font-size: 10pt;" class=3D"">&nbsp;</span><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""></div><blockquote =
type=3D"cite" class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif; font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D"">One thing this discussion does make me think, is that it =
might be worth adding some advice to implementors to the spec, for which =
notification types should always be wrapped up in a Hard =
Reset.&nbsp;<o:p class=3D""></o:p></div></blockquote><div style=3D"margin:=
 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 10pt; font-family: Arial, sans-serif;" =
class=3D"">[Bruno] If =E2=80=9Cshould always=E2=80=9D translates as =
=E2=80=9CMUST=E2=80=9D then the draft needs to also specify the error =
handling when the original signaling is sent. =
</span></div></div></blockquote><div><br class=3D""></div><div>I meant =
"should always" in a much weaker sense, and the draft language I have in =
my edit buffer (hopefully) makes that clear. I think it should be an =
implementation choice when to send a hard reset vs. a regular one (maybe =
we should call the latter a "graceful" reset), but it does seem useful =
to offer guidance to implementors when we have something useful to =
say.</div><div><br class=3D""></div><div>I'll share a proposed revision =
once I've finished coming up to date with the mail thread.</div><div><br =
class=3D""></div><div>Thanks,</div><div><br =
class=3D""></div><div>--John</div></div></div></body></html>=

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Date: Fri, 6 Apr 2018 13:49:26 +0000
From: Job Snijders <job@ntt.net>
To: bruno.decraene@orange.com
Cc: "John G. Scudder" <jgs@juniper.net>, Alvaro Retana <aretana.ietf@gmail.com>, "draft-ietf-idr-bgp-gr-notification@ietf.org" <draft-ietf-idr-bgp-gr-notification@ietf.org>,  "draft-snijders-idr-rfc8203bis@ietf.org" <draft-snijders-idr-rfc8203bis@ietf.org>, "idr@ietf. org" <idr@ietf.org>
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Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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On Fri, Apr 06, 2018 at 08:55:01AM +0000, bruno.decraene@orange.com wrote:
> Hi John, Job, all
> 
> Hijacking the thread with a remotely related comment.

Yes, you are. You raise valid points, thank you.

What would you suggest as a solution?

Kind regards,

Job


> draft-ietf-idr-bgp-gr-notification and RFC8203/draft-snijders-idr-rfc8203bis-01 seems to ignore each other and as a result seems incompatible.
> 
> 
> 1)     It’s not crystal clear whether the use of RFC8203 is allowed with draft-ietf-idr-bgp-gr-notification given that with the latter, such NOTIFICATION message would be send with Error Code “Cease” and Error Subcode “Hard Reset” which is not covered by RFC 8203:
> 
> 
> 
> “   If a BGP speaker decides to terminate its session with a BGP
>    neighbor, and it sends a NOTIFICATION message with the Error Code
>    "Cease" and Error Subcode "Administrative Shutdown" or
>    "Administrative Reset" [RFC4486<https://tools.ietf.org/html/rfc4486>], it MAY include an UTF-8 encoded
>    string.  ”
> https://tools.ietf.org/html/draft-snijders-idr-rfc8203bis-01#section-2
> 
> So either RFC8203/draft-snijders-idr-rfc8203bis-01 needs to cover both cases. Or draft-ietf-idr-bgp-gr-notification needs to state that the Hard Reset encapsulation behave as per the encapsulated Error Code, in all protocol aspects (but X, Y).
> 
> 
> 
> 2)     In which order is the Notification data field highjacked?
> 
> https://tools.ietf.org/html/draft-snijders-idr-rfc8203bis-01#section-2  says:
> 
>    The Cease NOTIFICATION message with a Shutdown Communication is
>    encoded as below:
> 
>     0                   1                   2                   3
>     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>    | Error code 6  |    Subcode    |    Length     |     ...       \
>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+               /
>    \                                                               \
>    /                 ... Shutdown Communication ...                /
>    \                                                               \
>    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> 
> 
> 
> 
> https://tools.ietf.org/html/draft-ietf-idr-bgp-gr-notification-13#section-3.1 says:
> 
> 3.1<https://tools.ietf.org/html/draft-ietf-idr-bgp-gr-notification-13#section-3.1>.  Sending a Hard Reset
> 
> 
>    A Hard Reset message is used to indicate to a peer with which the
>    Graceful Notification flag has been exchanged, that the session is to
>    be fully terminated.
> 
>    When sending a Hard Reset, the data portion of the NOTIFICATION is
>    encoded as follows:
> 
>        +--------+--------+--------
>        | ErrCode| Subcode| Data
>        +--------+--------+--------
> 
> 
> 
> Given that no TLV encoding has been introduced, if both spec are enabled, should we first encode the encapsulated Code or the shutdown communication? (I would personally assume the former but fortunately my opinion is not normative)
> 
> 
> Thanks,
> Regards,
> --Bruno
> 
> From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of John G. Scudder
> Sent: Tuesday, April 03, 2018 10:03 PM
> To: Alvaro Retana; idr@ietf. org
> Cc: idr-chairs@ietf.org; draft-ietf-idr-bgp-gr-notification@ietf.org
> Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
> 
> Hi WG,
> 
> As co-chair, I want to point out that the AD asked the WG for comments ("I want to ask the WG to consider..."). Since Alvaro asked more than three months ago and nobody answered, maybe nobody has anything to say -- as he points out ("[After I wrote the text above…] I found that some of the points have been discussed on the list already"), this topic was beaten to death in March 2017 (https://www.ietf.org/mail-archive/web/idr/current/msg17679.html and the following thread, specifically in the context of session culling which Alvaro brings up). Also, for reference the original WGLC all the way back in May 2014 is here: https://www.ietf.org/mail-archive/web/idr/current/msg13202.html.
> 
> However, maybe some people have just missed Alvaro's request, so if you have comments you want considered, please send them by April 10. I will follow up myself (with cu-author hat).
> 
> Thanks,
> 
> --John
> 
> On Dec 7, 2017, at 4:11 PM, Alvaro Retana <aretana.ietf@gmail.com<mailto:aretana.ietf@gmail.com>> wrote:
> 
> Dear authors:
> 
> I just finished reading this document — I have some comments, please see the list below.
> 
> I understand the intent of this document: instead of resetting a BGP session when a NOTIFICATION is received, use Graceful Restart; if the session is going to *really* be reset, then use the new Hard Reset sub-code.  That makes sense to me…but, is that the only code/sub-code for which it makes sense to do a hard reset?  The NOTIFICATION has always had the “stigma” of being something bad, so much that we (idr/IETF) have even worked on ways to reduce its use (rfc7606, for example).  I want to ask the WG to consider whether other code/sub-code NOTIFICATION combinations should also result in a hard reset.  I think there are several cases, for example:
> 
> (1) rfc4486 (Subcodes for BGP Cease Notification Message) defines “Administrative Shutdown” ("a BGP speaker decides to administratively shut down its peering with a neighbor”).  It seems to me that the sender of this NOTIFICATION would not want to "follow the rules for the Receiving Speaker” (as specified in Section 4).
> 
> (2) rfc4486 also defines "Administrative Reset” ("a BGP speaker decides to administratively reset the peering with a neighbor”); no more details are provided, but that sounds like a hard reset to me.
> 
> (3) …there’s probably others...
> 
> Having said all that, I note that Section 3.1. (Sending a Hard Reset) specifies the “encapsulation” (for lack of a better word) of the real reason for the Hard Reset.  If the consensus is to go forward with that, and not call out other exceptions, then I think that the text in 3.1 should expand more on the encapsulation operation and the rationale for doing it this way, and the document should also address other recent work that recommends the use of Administrative Shutdown, for example draft-ietf-grow-bgp-session-culling (a BCP currently in the RFC Editor’s Queue).
> 
> [After I wrote the text above…] I found that some of the points have been discussed on the list already — please include some of that discussion/analysis in the document.
> 
> 
> I’ll wait until the issue above and ones marked Major (below) are addressed before starting the IETF LC.
> 
> Thanks!
> 
> Alvaro.
> 
> 
> 
> Major:
> 
> M1. Unfortunately, rfc4724 failed to setup a registry for the Restat Flags (or the Flags for Address Family), which means that anyone is able to use the bits in there (assuming the receiver looks at them, of course).  Given that there are only a few bits, and to prevent conflicts, I would really like to see a registry set up.  This document is already tagged to Update rfc4724, so it seems like a good place to establish the registries.  [If for some reason you rather not include that information here, then we can take care of it elsewhere.  IOW, this request is not a requirement.]
> 
> 
> 
> 
> M2. Section 4.1. (Rules for the Receiving Speaker) has me a little confused.  Are the proposed changes contingent to setting the N bit?  The text starts by saying: "As part of this extension, routes from the peer previously marked as stale MUST NOT be deleted, until and unless the optional timer…expires…”…does that mean that the timer is no longer optional?   Then you also say: “...if the Graceful Notification ("N") bit is not set in the newly received Graceful Restart Capability, no new actions are triggered on the Receiving Speaker -- in particular, a clear "N” bit does not trigger deletion of stale routes.”  If I understand rfc4724 correctly, stale routes could be deleted — the text indicates changes in the behavior even if the N bit is not set, right?  If you are Updating this section of rfc4724, what would make it crystal clear is an “OLD/NEW” notation of the text (as in, this is the OLD text…and this is the NEW text…).
> 
> 
> 
> 
> 
> M3. Security Considerations:  Maybe not a security issue, but something to think about.  Section 4.1 says that “routes...previously marked as stale MUST NOT be deleted, until and unless the optional timer...expires, or unless a Hard Reset is performed.  This supersedes the “consecutive restarts” requirement…”.  Not deleting the stale routes and not making the timer mandatory could result in stale routes that live forever if an attacker manages to create consecutive restarts (by simply sending NOTIFICATIONS before EoR) — stale routes are ok in the short term, but may point in the wrong direction eventually.  Is this an issue?  I think that it would be mitigated if the timer was made mandatory (with a nice default).
> 
> 
> 
> 
> 
> Minor:
> 
> 
> P1. Section 4: “...receive and send BGP NOTIFICATION messages in Graceful mode...” What is “Graceful mode”?
> 
> 
> 
> 
> 
> Nits:
> 
> N1. In Section 2, please indicate that the first figure corresponds to the GR Capability from rfc4724.
> 
> N2. s/subcode is defined known as/subcode is defined as
> 
> N3. s/Graceful Notification flag/Graceful Notification bit   (For consistency)
> 
> N4. The operation is obviously per-AF; maybe it’s worth saying that somewhere just for completeness.
> 
> 
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From: <bruno.decraene@orange.com>
To: Job Snijders <job@ntt.net>
CC: "John G. Scudder" <jgs@juniper.net>, Alvaro Retana <aretana.ietf@gmail.com>, "draft-ietf-idr-bgp-gr-notification@ietf.org" <draft-ietf-idr-bgp-gr-notification@ietf.org>, "draft-snijders-idr-rfc8203bis@ietf.org" <draft-snijders-idr-rfc8203bis@ietf.org>, "idr@ietf. org" <idr@ietf.org>
Thread-Topic: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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Date: Fri, 6 Apr 2018 14:13:23 +0000
Message-ID: <25525_1523024004_5AC78084_25525_378_1_53C29892C857584299CBF5D05346208A47A00EFD@OPEXCLILM21.corporate.adroot.infra.ftgroup>
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Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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Subject: [Idr] I-D Action: draft-ietf-idr-bgp-gr-notification-14.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Notification Message support for BGP Graceful Restart
        Authors         : Keyur Patel
                          Rex Fernando
                          John Scudder
                          Jeff Haas
	Filename        : draft-ietf-idr-bgp-gr-notification-14.txt
	Pages           : 9
	Date            : 2018-04-06

Abstract:
   The BGP Graceful Restart mechanism defined in RFC 4724 limits the
   usage of BGP Graceful Restart to BGP protocol messages other than a
   BGP NOTIFICATION message.  This document updates RFC 4724 by defining
   an extension that permits the Graceful Restart procedures to be
   performed when the BGP speaker receives a BGP NOTIFICATION Message or
   the Hold Time expires.  This document also defines a new BGP
   NOTIFICATION Cease Error subcode whose effect is to request a full
   session restart instead of a Graceful Restart.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-gr-notification/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-gr-notification-14
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-gr-notification-14

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-bgp-gr-notification-14


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

Internet-Drafts are also available by anonymous FTP at:
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/8NSW8ZGiNBhQUOEeYduLXJcuUr0>
Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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Hi Bruno,

I've just posted a -14 which I believe addresses all comments so far =
(yours and Alvaro's) other than this one, for which some discussion =
below.

> On Apr 6, 2018, at 4:57 AM, bruno.decraene@orange.com wrote:
>=20
> Hi John,
> =20
> Sorry to turn this thread into a general call for comment while the =
document is post WGLC=E2=80=A6

Better now than when it gets to IETF Last Call.
=20
> When:
> 1)     a BGP session is established (OPEN1)
> 2)     then GR or draft-ietf-idr-bgp-gr-notification triggers a new =
BGP open (OPEN2)
> 3)     this BGP OPEN2 triggers a Notification OPEN Message Error
> 4)     draft-ietf-idr-bgp-gr-notification is used to handle this =
Notification using GR
> =20
> It=E2=80=99s not crystal clear to me whether the BGP speakers should =
behave (in term of OPEN capability/parameters) as per OPEN1 or as per =
OPEN2.
> Indeed, OPEN2 is the latest but was erroneous and explicitly refused.
> Then again, the answer may be subcode specific=E2=80=A6 (with =
=E2=80=9CUnacceptable Hold Time=E2=80=9D it=E2=80=99s unlikely to accept =
the (Hold Time) parameter(s) from OPEN2).

I think if the OPEN2 still exchanges the "N" bit it's already =
sufficiently specified, or maybe the point is moot.=20

OTOH if OPEN2 doesn't exchange the "N" bit (either because it removes =
the GR capability entirely or because it removes the bit) then maybe =
there is some clarification required. Unfortunately RFC 5492 doesn't =
seem to say when a capability is said to have been successfully =
exchanged, probably because at time of writing (or at least at time of =
writing the predecessor) the idea of keeping around previous-session =
state didn't exist.=20

Tentatively, my answer is to say "a capability is only considered to =
have been exchanged when the session carrying it transitions to =
ESTABLISHED state". In the situation under discussion, that wouldn't =
happen, so gr-notification type semantics would continue to remain in =
effect.

--John

> =20
> Thanks,
> --Bruno
> =20
> From: Idr [mailto:idr-bounces@ietf.org <mailto:idr-bounces@ietf.org>] =
On Behalf Of John G. Scudder
> Sent: Tuesday, April 03, 2018 10:03 PM
> To: Alvaro Retana; idr@ietf. org
> Cc: idr-chairs@ietf.org <mailto:idr-chairs@ietf.org>; =
draft-ietf-idr-bgp-gr-notification@ietf.org =
<mailto:draft-ietf-idr-bgp-gr-notification@ietf.org>
> Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
> =20
> Hi WG,
> =20
> As co-chair, I want to point out that the AD asked the WG for comments =
("I want to ask the WG to consider..."). Since Alvaro asked more than =
three months ago and nobody answered, maybe nobody has anything to say =
-- as he points out ("[After I wrote the text above=E2=80=A6] I found =
that some of the points have been discussed on the list already"), this =
topic was beaten to death in March 2017 =
(https://www.ietf.org/mail-archive/web/idr/current/msg17679.html =
<https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.org_mail-=
2Darchive_web_idr_current_msg17679.html&d=3DDwMGaQ&c=3DHAkYuh63rsuhr6Scbfh=
0UjBXeMK-ndb3voDTXcWzoCI&r=3DhLt5iDJpw7ukqICc0hoT7A&m=3D7AX9lsHCz9FSlFK6fe=
RmlnAwToPRMqMdbsjdQNxre98&s=3DEb2l4KGMYRyULZHgUquSdC0EFBsq78qFVgQH_0svDSU&=
e=3D> and the following thread, specifically in the context of session =
culling which Alvaro brings up). Also, for reference the original WGLC =
all the way back in May 2014 is here: =
https://www.ietf.org/mail-archive/web/idr/current/msg13202.html =
<https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.org_mail-=
2Darchive_web_idr_current_msg13202.html&d=3DDwMGaQ&c=3DHAkYuh63rsuhr6Scbfh=
0UjBXeMK-ndb3voDTXcWzoCI&r=3DhLt5iDJpw7ukqICc0hoT7A&m=3D7AX9lsHCz9FSlFK6fe=
RmlnAwToPRMqMdbsjdQNxre98&s=3DCj0Pme9WuS9-M7h-jLQRDlyUlQT70fb2qCojXaqenYQ&=
e=3D>.
> =20
> However, maybe some people have just missed Alvaro's request, so if =
you have comments you want considered, please send them by April 10. I =
will follow up myself (with cu-author hat).
> =20
> Thanks,
> =20
> --John
> =20
> On Dec 7, 2017, at 4:11 PM, Alvaro Retana <aretana.ietf@gmail.com =
<mailto:aretana.ietf@gmail.com>> wrote:
> =20
> Dear authors:
> =20
> I just finished reading this document =E2=80=94 I have some comments, =
please see the list below.
> =20
> I understand the intent of this document: instead of resetting a BGP =
session when a NOTIFICATION is received, use Graceful Restart; if the =
session is going to *really* be reset, then use the new Hard Reset =
sub-code.  That makes sense to me=E2=80=A6but, is that the only =
code/sub-code for which it makes sense to do a hard reset?  The =
NOTIFICATION has always had the =E2=80=9Cstigma=E2=80=9D of being =
something bad, so much that we (idr/IETF) have even worked on ways to =
reduce its use (rfc7606, for example).  I want to ask the WG to consider =
whether other code/sub-code NOTIFICATION combinations should also result =
in a hard reset.  I think there are several cases, for example:
> =20
> (1) rfc4486 (Subcodes for BGP Cease Notification Message) defines =
=E2=80=9CAdministrative Shutdown=E2=80=9D ("a BGP speaker decides to =
administratively shut down its peering with a neighbor=E2=80=9D).  It =
seems to me that the sender of this NOTIFICATION would not want to =
"follow the rules for the Receiving Speaker=E2=80=9D (as specified in =
Section 4).
> =20
> (2) rfc4486 also defines "Administrative Reset=E2=80=9D ("a BGP =
speaker decides to administratively reset the peering with a =
neighbor=E2=80=9D); no more details are provided, but that sounds like a =
hard reset to me.
> =20
> (3) =E2=80=A6there=E2=80=99s probably others...
> =20
> Having said all that, I note that Section 3.1. (Sending a Hard Reset) =
specifies the =E2=80=9Cencapsulation=E2=80=9D (for lack of a better =
word) of the real reason for the Hard Reset.  If the consensus is to go =
forward with that, and not call out other exceptions, then I think that =
the text in 3.1 should expand more on the encapsulation operation and =
the rationale for doing it this way, and the document should also =
address other recent work that recommends the use of Administrative =
Shutdown, for example draft-ietf-grow-bgp-session-culling (a BCP =
currently in the RFC Editor=E2=80=99s Queue).
> =20
> [After I wrote the text above=E2=80=A6] I found that some of the =
points have been discussed on the list already =E2=80=94 please include =
some of that discussion/analysis in the document.
> =20
> =20
> I=E2=80=99ll wait until the issue above and ones marked Major (below) =
are addressed before starting the IETF LC.
> =20
> Thanks!
> =20
> Alvaro.
> =20
> =20
> =20
> Major:
> =20
> M1. Unfortunately, rfc4724 failed to setup a registry for the Restat =
Flags (or the Flags for Address Family), which means that anyone is able =
to use the bits in there (assuming the receiver looks at them, of =
course).  Given that there are only a few bits, and to prevent =
conflicts, I would really like to see a registry set up.  This document =
is already tagged to Update rfc4724, so it seems like a good place to =
establish the registries.  [If for some reason you rather not include =
that information here, then we can take care of it elsewhere.  IOW, this =
request is not a requirement.]
> =20
> =20
> M2. Section 4.1. (Rules for the Receiving Speaker) has me a little =
confused.  Are the proposed changes contingent to setting the N bit?  =
The text starts by saying: "As part of this extension, routes from the =
peer previously marked as stale MUST NOT be deleted, until and unless =
the optional timer=E2=80=A6expires=E2=80=A6=E2=80=9D=E2=80=A6does that =
mean that the timer is no longer optional?   Then you also say: =E2=80=9C.=
..if the Graceful Notification ("N") bit is not set in the newly =
received Graceful Restart Capability, no new actions are triggered on =
the Receiving Speaker -- in particular, a clear "N=E2=80=9D bit does not =
trigger deletion of stale routes.=E2=80=9D  If I understand rfc4724 =
correctly, stale routes could be deleted =E2=80=94 the text indicates =
changes in the behavior even if the N bit is not set, right?  If you are =
Updating this section of rfc4724, what would make it crystal clear is an =
=E2=80=9COLD/NEW=E2=80=9D notation of the text (as in, this is the OLD =
text=E2=80=A6and this is the NEW text=E2=80=A6).
> =20
> =20
> M3. Security Considerations:  Maybe not a security issue, but =
something to think about.  Section 4.1 says that =E2=80=9Croutes...previou=
sly marked as stale MUST NOT be deleted, until and unless the optional =
timer...expires, or unless a Hard Reset is performed.  This supersedes =
the =E2=80=9Cconsecutive restarts=E2=80=9D requirement=E2=80=A6=E2=80=9D. =
 Not deleting the stale routes and not making the timer mandatory could =
result in stale routes that live forever if an attacker manages to =
create consecutive restarts (by simply sending NOTIFICATIONS before EoR) =
=E2=80=94 stale routes are ok in the short term, but may point in the =
wrong direction eventually.  Is this an issue?  I think that it would be =
mitigated if the timer was made mandatory (with a nice default).
> =20
> =20
> =20
> Minor:
> =20
> P1. Section 4: =E2=80=9C...receive and send BGP NOTIFICATION messages =
in Graceful mode...=E2=80=9D What is =E2=80=9CGraceful mode=E2=80=9D?
> =20
> =20
> =20
> Nits:=20
> =20
> N1. In Section 2, please indicate that the first figure corresponds to =
the GR Capability from rfc4724.
> =20
> N2. s/subcode is defined known as/subcode is defined as
> =20
> N3. s/Graceful Notification flag/Graceful Notification bit   (For =
consistency)
> =20
> N4. The operation is obviously per-AF; maybe it=E2=80=99s worth saying =
that somewhere just for completeness.
> =20
> =
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--Apple-Mail=_445B8F3B-2BD8-4566-AA5A-9332041E30C0
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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""><div class=3D"">Hi Bruno,</div><div class=3D""><br =
class=3D""></div>I've just posted a -14 which I believe addresses all =
comments so far (yours and Alvaro's) other than this one, for which some =
discussion below.<div class=3D""><br class=3D""><div><blockquote =
type=3D"cite" class=3D""><div class=3D"">On Apr 6, 2018, at 4:57 AM, <a =
href=3D"mailto:bruno.decraene@orange.com" =
class=3D"">bruno.decraene@orange.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-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">Hi John,<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;" class=3D""><span style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;" 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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">Sorry to turn this thread into a general =
call for comment while the document is post =
WGLC=E2=80=A6</span></div></div></div></blockquote><div><br =
class=3D""></div><div>Better now than when it gets to IETF Last =
Call.</div><div><span style=3D"font-family: Arial, sans-serif; =
font-size: 10pt;" class=3D"">&nbsp;</span></div><blockquote type=3D"cite" =
class=3D""><div class=3D"WordSection1" style=3D"page: WordSection1; =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D"">When:<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt =
36pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
text-indent: -18pt;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D""><span class=3D"">1)<span=
 style=3D"font-style: normal; font-variant-caps: normal; font-weight: =
normal; font-size: 7pt; line-height: normal; font-family: 'Times New =
Roman';" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">a BGP session is established (OPEN1)<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt =
36pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
text-indent: -18pt;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D""><span class=3D"">2)<span=
 style=3D"font-style: normal; font-variant-caps: normal; font-weight: =
normal; font-size: 7pt; line-height: normal; font-family: 'Times New =
Roman';" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">then GR or draft-ietf-idr-bgp-gr-notification =
triggers a new BGP open (OPEN2)<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt 36pt; font-size: 12pt; font-family: =
'Times New Roman', serif; text-indent: -18pt;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D""><span class=3D"">3)<span style=3D"font-style: =
normal; font-variant-caps: normal; font-weight: normal; font-size: 7pt; =
line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">this BGP OPEN2 triggers a Notification OPEN =
Message Error<o:p class=3D""></o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt 36pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; text-indent: -18pt;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 10pt; font-family: Arial, sans-serif;" =
class=3D""><span class=3D"">4)<span style=3D"font-style: normal; =
font-variant-caps: normal; font-weight: normal; font-size: 7pt; =
line-height: normal; font-family: 'Times New Roman';" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span></span></span><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">draft-ietf-idr-bgp-gr-notification is used to =
handle this Notification using GR<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" 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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">It=E2=80=99s not crystal clear to me =
whether the BGP speakers should behave (in term of OPEN =
capability/parameters) as per OPEN1 or as per OPEN2.<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;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">Indeed, OPEN2 is the latest but was erroneous =
and explicitly refused.<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D"">Then again, the answer =
may be subcode specific=E2=80=A6 (with =E2=80=9CUnacceptable Hold =
Time=E2=80=9D it=E2=80=99s unlikely to accept the (Hold Time) =
parameter(s) from OPEN2).</span></div></div></blockquote><div><br =
class=3D""></div><div>I think if the OPEN2 still exchanges the "N" bit =
it's already sufficiently specified, or maybe the point is =
moot.&nbsp;</div><div><br class=3D""></div><div>OTOH if OPEN2 doesn't =
exchange the "N" bit (either because it removes the GR capability =
entirely or because it removes the bit) then maybe there is some =
clarification required. Unfortunately RFC 5492 doesn't seem to say when =
a capability is said to have been successfully exchanged, probably =
because at time of writing (or at least at time of writing the =
predecessor) the idea of keeping around previous-session state didn't =
exist.&nbsp;</div><div><br class=3D""></div><div>Tentatively, my answer =
is to say "a capability is only considered to have been exchanged when =
the session carrying it transitions to ESTABLISHED state". In the =
situation under discussion, that wouldn't happen, so gr-notification =
type semantics would continue to remain in effect.</div><div><br =
class=3D""></div><div>--John</div></div><div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D"WordSection1" style=3D"page: =
WordSection1; font-family: Helvetica; font-size: 12px; font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: =
0px;"><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 10pt; font-family: Arial, sans-serif;" class=3D""><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;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" 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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D"">Thanks,<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;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">--Bruno<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"border-style: none =
none none solid; border-left-width: 1.5pt; border-left-color: blue; =
padding: 0cm 0cm 0cm 4pt;" class=3D""><div class=3D""><div =
style=3D"border-style: solid none none; border-top-width: 1pt; =
border-top-color: rgb(181, 196, 223); padding: 3pt 0cm 0cm;" =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><b class=3D""><span =
style=3D"font-size: 10pt; font-family: Tahoma, sans-serif;" =
class=3D"">From:</span></b><span style=3D"font-size: 10pt; font-family: =
Tahoma, sans-serif;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>Idr [<a =
href=3D"mailto:idr-bounces@ietf.org" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">mailto:idr-bounces@ietf.org</a>]<span =
class=3D"Apple-converted-space">&nbsp;</span><b class=3D"">On Behalf =
Of<span class=3D"Apple-converted-space">&nbsp;</span></b>John G. =
Scudder<br class=3D""><b class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Tuesday, April 03, 2018 =
10:03 PM<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Alvaro Retana; idr@ietf. =
org<br class=3D""><b class=3D"">Cc:</b><span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:idr-chairs@ietf.org" style=3D"color: purple; =
text-decoration: underline;" class=3D"">idr-chairs@ietf.org</a>;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:draft-ietf-idr-bgp-gr-notification@ietf.org" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">draft-ietf-idr-bgp-gr-notification@ietf.org</a><br =
class=3D""><b class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Re: [Idr] AD Review of =
draft-ietf-idr-bgp-gr-notification-13<o:p =
class=3D""></o:p></span></div></div></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Hi WG,<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">As co-chair, I want to point out that the =
AD asked the WG for comments ("I want to ask the WG to consider..."). =
Since Alvaro asked more than three months ago and nobody answered, maybe =
nobody has anything to say -- as he points out ("[After I wrote the text =
above=E2=80=A6] I found that some of the points have been discussed on =
the list already"), this topic was beaten to death in March 2017 (<a =
href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.or=
g_mail-2Darchive_web_idr_current_msg17679.html&amp;d=3DDwMGaQ&amp;c=3DHAkY=
uh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=3DhLt5iDJpw7ukqICc0hoT7A&amp=
;m=3D7AX9lsHCz9FSlFK6feRmlnAwToPRMqMdbsjdQNxre98&amp;s=3DEb2l4KGMYRyULZHgU=
quSdC0EFBsq78qFVgQH_0svDSU&amp;e=3D" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">https://www.ietf.org/mail-archive/web/idr/current/msg17679.html=
</a><span class=3D"Apple-converted-space">&nbsp;</span>and the following =
thread, specifically in the context of session culling which Alvaro =
brings up). Also, for reference the original WGLC all the way back in =
May 2014 is here:<span class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.or=
g_mail-2Darchive_web_idr_current_msg13202.html&amp;d=3DDwMGaQ&amp;c=3DHAkY=
uh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=3DhLt5iDJpw7ukqICc0hoT7A&amp=
;m=3D7AX9lsHCz9FSlFK6feRmlnAwToPRMqMdbsjdQNxre98&amp;s=3DCj0Pme9WuS9-M7h-j=
LQRDlyUlQT70fb2qCojXaqenYQ&amp;e=3D" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">https://www.ietf.org/mail-archive/web/idr/current/msg13202.html=
</a>.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">However, maybe some people have just missed Alvaro's =
request, so if you have comments you want considered, please send them =
by April 10. I will follow up myself (with cu-author hat).<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Thanks,<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">--John<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
class=3D""><blockquote style=3D"margin-top: 5pt; margin-bottom: 5pt;" =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D"">On =
Dec 7, 2017, at 4:11 PM, Alvaro Retana &lt;<a =
href=3D"mailto:aretana.ietf@gmail.com" style=3D"color: purple; =
text-decoration: underline;" class=3D"">aretana.ietf@gmail.com</a>&gt; =
wrote:<o:p class=3D""></o:p></div></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-family: Helvetica, sans-serif;" class=3D"">Dear =
authors:</span><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-family: Helvetica, sans-serif;" =
class=3D"">I just finished reading this document&nbsp;=E2=80=94 I =
have&nbsp;some comments, please see the list below.</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-family: Helvetica, =
sans-serif;" class=3D"">I understand the intent of this document: =
instead of resetting a BGP session when a NOTIFICATION is received, use =
Graceful Restart; if the session is going to *really* be reset, then use =
the new Hard Reset sub-code.&nbsp; That makes sense to me=E2=80=A6but, =
is that the only code/sub-code for which it makes sense to do a hard =
reset?&nbsp; The NOTIFICATION has always had the&nbsp;=E2=80=9Cstigma=E2=80=
=9D of being something bad, so much that we (idr/IETF) have even worked =
on ways to reduce its use (rfc7606, for example).&nbsp; I want to ask =
the WG to consider whether other code/sub-code NOTIFICATION combinations =
should also result in a hard reset.&nbsp; I think there are several =
cases, for example:</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-family: Helvetica, sans-serif;" =
class=3D"">(1)&nbsp;rfc4486 (Subcodes for BGP Cease Notification =
Message) defines&nbsp;=E2=80=9CAdministrative Shutdown=E2=80=9D ("a BGP =
speaker decides to administratively shut down its peering with a =
neighbor=E2=80=9D).&nbsp; It seems to me that the sender of this =
NOTIFICATION would not want to "follow the rules for the Receiving =
Speaker=E2=80=9D (as specified in Section 4).</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-family: Helvetica, =
sans-serif;" class=3D"">(2) rfc4486 also defines "Administrative =
Reset=E2=80=9D ("</span>a BGP speaker decides to administratively reset =
the peering with a neighbor=E2=80=9D); no more details are provided, but =
that sounds like a hard reset to me.<o:p class=3D""></o:p></div></div><div=
 class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">(3) =E2=80=A6there=E2=80=99s probably others...<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Having said all that, I note that =
Section&nbsp;3.1. (Sending a Hard Reset) specifies the =
=E2=80=9Cencapsulation=E2=80=9D (for lack of a better word) of the real =
reason for the Hard Reset.&nbsp; If the consensus is to go forward with =
that, and not call out other exceptions, then I think that the text in =
3.1 should expand more on the encapsulation operation and the rationale =
for doing it this way, and the document should also address other recent =
work that recommends the use of Administrative Shutdown, for example =
draft-ietf-grow-bgp-session-culling (a BCP currently in the RFC =
Editor=E2=80=99s Queue).<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">[After I wrote the text above=E2=80=A6] I found that =
some of the points have been discussed on the list already =E2=80=94 =
please include some of that discussion/analysis in the document.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">I=E2=80=99ll wait until the issue above and ones =
marked Major (below) are addressed before starting the IETF LC.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Thanks!<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Alvaro.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-family: Helvetica, sans-serif;" class=3D"">Major:</span><o:p=
 class=3D""></o:p></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-family: Helvetica, sans-serif;" =
class=3D"">M1. Unfortunately, rfc4724 failed to setup a registry for the =
Restat Flags (or the Flags for Address Family), which means that anyone =
is able to use the bits in there (assuming the receiver looks at them, =
of course).&nbsp; Given that there are only a few bits, and to prevent =
conflicts, I would really like to see a registry set up.&nbsp; This =
document is already tagged to Update rfc4724, so it seems like a good =
place to establish the registries. &nbsp;[If for some reason you rather =
not include that information here, then we can take care of it =
elsewhere.&nbsp; IOW, this request is not a requirement.]</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><pre =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: =
'Courier New';" class=3D""><o:p class=3D"">&nbsp;</o:p></pre><pre =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: =
'Courier New';" class=3D""><span style=3D"font-family: Helvetica, =
sans-serif;" class=3D"">M2. Section 4.1. (Rules for the Receiving =
Speaker) has me a little confused.&nbsp; Are the proposed changes =
contingent to setting the N bit?&nbsp; The text starts by saying: "As =
part of this extension, routes from the peer previously marked as stale =
MUST NOT be deleted, until and unless the optional =
timer=E2=80=A6expires=E2=80=A6=E2=80=9D=E2=80=A6does that mean that the =
timer is no longer optional?&nbsp;&nbsp; Then you also say: =E2=80=9C...if=
 the Graceful Notification ("N") bit is not set in the newly received =
Graceful Restart Capability, no new actions are triggered on the =
Receiving Speaker -- in particular, a clear "N=E2=80=9D bit does not =
trigger deletion of stale routes.=E2=80=9D&nbsp; If I understand rfc4724 =
correctly, stale routes could be deleted =E2=80=94 the text indicates =
changes in the behavior even if the N bit is not set, right?&nbsp; If =
you are Updating this section of rfc4724, what would make it crystal =
clear is an =E2=80=9COLD/NEW=E2=80=9D notation of the text (as in, this =
is the OLD text=E2=80=A6and this is the NEW text=E2=80=A6).</span><o:p =
class=3D""></o:p></pre><pre style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 10pt; font-family: 'Courier New';" class=3D""><o:p =
class=3D"">&nbsp;</o:p></pre><pre style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 10pt; font-family: 'Courier New';" class=3D""><o:p =
class=3D"">&nbsp;</o:p></pre><pre style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 10pt; font-family: 'Courier New';" class=3D""><span =
style=3D"font-family: Helvetica, sans-serif;" class=3D"">M3. Security =
Considerations:&nbsp; Maybe not a security issue, but something to think =
about.&nbsp; Section 4.1 says that =E2=80=9Croutes...previously marked =
as stale MUST NOT be deleted, until and unless the optional =
timer...expires, or unless a Hard Reset is performed.&nbsp; This =
supersedes the =E2=80=9Cconsecutive restarts=E2=80=9D =
requirement=E2=80=A6=E2=80=9D.&nbsp; Not deleting the stale routes and =
not making the timer mandatory could result in stale routes that live =
forever if an attacker manages to create consecutive restarts (by simply =
sending NOTIFICATIONS before EoR) =E2=80=94 stale routes are ok in the =
short term, but may point in the wrong direction eventually.&nbsp; Is =
this an issue?&nbsp; I think that it would be mitigated if the timer was =
made mandatory (with a nice default).</span><o:p =
class=3D""></o:p></pre><pre style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 10pt; font-family: 'Courier New';" class=3D""><o:p =
class=3D"">&nbsp;</o:p></pre><pre style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 10pt; font-family: 'Courier New';" class=3D""><o:p =
class=3D"">&nbsp;</o:p></pre></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-family: Helvetica, sans-serif;" class=3D"">Minor:</span><o:p=
 class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><pre =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: =
'Courier New';" class=3D""><span style=3D"font-family: Helvetica, =
sans-serif;" class=3D"">P1. Section 4: =E2=80=9C...receive and send BGP =
NOTIFICATION messages in Graceful mode...=E2=80=9D What is =E2=80=9CGracef=
ul mode=E2=80=9D?</span><o:p class=3D""></o:p></pre><pre style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 10pt; font-family: 'Courier New';" =
class=3D""><o:p class=3D"">&nbsp;</o:p></pre><pre style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 10pt; font-family: 'Courier New';" =
class=3D""><o:p class=3D"">&nbsp;</o:p></pre><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-family: Helvetica, sans-serif;" =
class=3D"">Nits:<span =
class=3D"Apple-converted-space">&nbsp;</span></span><o:p =
class=3D""></o:p></div><div class=3D""><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-family: Helvetica, =
sans-serif;" class=3D"">N1. In Section 2, please indicate that the first =
figure corresponds to the GR Capability from rfc4724.</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-family: Helvetica, =
sans-serif;" class=3D"">N2. s/subcode is defined known as/subcode is =
defined as</span><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-family: Helvetica, sans-serif;" =
class=3D"">N3. s/Graceful Notification flag/Graceful Notification bit =
&nbsp; (For consistency)</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-family: Helvetica, sans-serif;" =
class=3D"">N4. The operation is obviously per-AF; maybe it=E2=80=99s =
worth saying that somewhere just for completeness.</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></blockquote></=
div><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div></div></div><pre style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 10pt; font-family: 'Courier New'; font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-align: start; text-indent: 0px; text-transform: none; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D"">_______________________________________________________________=
__________________________________________________________

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Orange decline toute responsabilite si ce message a ete altere, deforme =
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From: "Krishna Muddenahally Ananthamurthy (kriswamy)" <kriswamy@cisco.com>
To: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: [Idr] FW: Requested: Volunteers to review draft-keyupate-lsvr-bgp-spf-00
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/Tm0vlu-ECSnIAyO1byj68AJm2XU>
Subject: Re: [Idr] WG LC for draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March 21)
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--Apple-Mail=_26A0B380-EB1F-495D-A068-A44DD02C4891
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Hi Authors (and WG),

Jeff raised two points during the WGLC:

> On Mar 15, 2018, at 7:07 PM, Jeffrey Haas <jhaas@pfrc.org> wrote:
>=20
> Minor comments as part of a re-read while waiting on my plane:
> RESERVED is not called out in its behavior.  Some place in the =
document
> should mention the usual "MUST be set to zero on send, SHOULD be =
ignored on
> receipt".  Otherwise, it's gibberish in, who knows what out when =
someone
> tries to use this field in the future.

I didn't see this one addressed. Authors, do you plan to update the =
draft to address the point? I didn't see any other points raised during =
the WGLC that would require an update.

> There are a number of TLV value fields that may be of variable =
lengths.  In
> many cases, those lengths are inherited from the underlying IGP =
documents.
> What is not documented is the behavior when the TLV is well formed but =
has
> unexpected length values.  Two simple examples:
> - Prefix Attribute Flag TLV; varies by IGP
> - Preference TLV; must be 1.
>=20
> Do we treat this as malformed?  Do we ignore the sub-tlv?

This point was discussed between Jeff and Ketan on the list. It seems to =
me that it does bear further discussion, but that the issue doesn't need =
to be fixed in this draft nor to be blocking on the conclusion of the =
WGLC. Assuming the WG feels we should do better, the most obvious thing =
IMO would be a document that updates RFC 7752.

Finally, authors and contributors, we forgot to ask for the usual IPR =
declaration as part of the WGLC. If you could please take care of =
letting us know whether or not you are aware of any relevant IPR that =
has not been declared, that would help conclude the WGLC. (Right now =
there is no IPR declared, =
https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&id=3Ddraft-ietf-id=
r-bgp-ls-segment-routing-ext)

Thanks,

--John=

--Apple-Mail=_26A0B380-EB1F-495D-A068-A44DD02C4891
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Hi Authors (and WG),<div class=3D""><br class=3D""></div><div =
class=3D"">Jeff raised two points during the WGLC:<br class=3D""><div =
class=3D""><br class=3D""><div><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Mar 15, 2018, at 7:07 PM, Jeffrey Haas &lt;<a =
href=3D"mailto:jhaas@pfrc.org" class=3D"">jhaas@pfrc.org</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">Minor comments as part of a =
re-read while waiting on my plane:</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">RESERVED is not called out in =
its behavior. &nbsp;Some place in the document</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">should mention the usual "MUST be set to zero on =
send, SHOULD be ignored on</span><br style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">receipt". &nbsp;Otherwise, it's =
gibberish in, who knows what out when someone</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">tries to use this field in the future.</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""></div></blockquote><div><br class=3D""></div><div>I didn't =
see this one addressed. Authors, do you plan to update the draft to =
address the point? I didn't see any other points raised during the WGLC =
that would require an update.</div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><span style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: =
inline !important;" class=3D"">There are a number of TLV value fields =
that may be of variable lengths. &nbsp;In</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">many cases, those lengths are =
inherited from the underlying IGP documents.</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">What is not documented is the behavior when the =
TLV is well formed but has</span><br style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">unexpected length values. =
&nbsp;Two simple examples:</span><br style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">- Prefix Attribute Flag TLV; =
varies by IGP</span><br style=3D"font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><span style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: =
inline !important;" class=3D"">- Preference TLV; must be 1.</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><br=
 style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">Do we treat this as malformed? &nbsp;Do we =
ignore the sub-tlv?</span><br style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""></div></blockquote></div><br class=3D""></div></div><div =
class=3D"">This point was discussed between Jeff and Ketan on the list. =
It seems to me that it does bear further discussion, but that the issue =
doesn't need to be fixed in this draft nor to be blocking on the =
conclusion of the WGLC. Assuming the WG feels we should do better, the =
most obvious thing IMO would be a document that updates RFC =
7752.</div><div class=3D""><br class=3D""></div><div class=3D"">Finally, =
authors and contributors, we forgot to ask for the usual IPR declaration =
as part of the WGLC. If you could please take care of letting us know =
whether or not you are aware of any relevant IPR that has not been =
declared, that would help conclude the WGLC. (Right now there is no IPR =
declared,&nbsp;<a =
href=3D"https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&amp;id=3Dd=
raft-ietf-idr-bgp-ls-segment-routing-ext" =
class=3D"">https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&amp;id=3D=
draft-ietf-idr-bgp-ls-segment-routing-ext</a>)</div><div class=3D""><br =
class=3D""></div><div class=3D"">Thanks,</div><div class=3D""><br =
class=3D""></div><div class=3D"">--John</div></body></html>=

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Subject: [Idr] Implementations of draft-ietf-idr-bgpls-segment-routing-epe (draft-ietf-ospf-link-overload)
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Dear idr WG:

draft-ietf-ospf-link-overload [1] defines a new BGP-LS
Graceful-Link-Shutdown TLV.  When an early allocation was requested, it was
mistakenly requested from the "BGP-LS NLRI-Types" registry [2], not from
the "BGP-LS Node Descriptor, Link Descriptor, Prefix Descriptor, and
Attribute TLVs=E2=80=9D registry [3].  IANA allocated a value according to =
the
request: 1101.

The mistake wasn't noticed until the document was in IESG Evaluation -- we
are in the process of correcting it.  However, the 1101 code point in the
"BGP-LS Node Descriptor, Link Descriptor, Prefix Descriptor, and Attribute
TLVs=E2=80=9D registry corresponds to the Peer-Node-SID, an early allocatio=
n made
to draft-ietf-idr-bgpls-segment-routing-epe [4], which says that "several
early implementations exist".

Are there implementations of draft-ietf-idr-bgpls-segment-routing-epe with
the 1101 code point?  Are there deployments of those implementations?

Thanks!

Alvaro.


[1] https://datatracker.ietf.org/doc/draft-ietf-ospf-link-overload/
[2]
https://www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#=
nlri-types

[3]
https://www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#=
node-descriptor-link-descriptor-prefix-descriptor-attribute-tlv

[4]
https://datatracker.ietf.org/doc/draft-ietf-idr-bgpls-segment-routing-epe/

--0000000000003ec4b80569328c54
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<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style>=
</head><body style=3D"word-wrap:break-word"><div id=3D"bloop_customfont" st=
yle=3D"margin:0px"><div id=3D"bloop_customfont" style=3D"margin:0px">Dear i=
dr WG:</div><div id=3D"bloop_customfont" style=3D"margin:0px"><br></div><di=
v id=3D"bloop_customfont" style=3D"margin:0px">draft-ietf-ospf-link-overloa=
d [1] defines a new BGP-LS Graceful-Link-Shutdown TLV.=C2=A0 When an early =
allocation was requested, it was mistakenly requested from the &quot;BGP-LS=
 NLRI-Types&quot; registry [2], not from the &quot;BGP-LS Node Descriptor, =
Link Descriptor, Prefix Descriptor, and Attribute TLVs=E2=80=9D registry [3=
].=C2=A0 IANA allocated a value according to the request: 1101.</div><div i=
d=3D"bloop_customfont" style=3D"margin:0px"><br></div><div id=3D"bloop_cust=
omfont" style=3D"margin:0px">The mistake wasn&#39;t noticed until the docum=
ent was in IESG Evaluation -- we are in the process of correcting it.=C2=A0=
 However, the 1101 code point in the &quot;BGP-LS Node Descriptor, Link Des=
criptor, Prefix Descriptor, and Attribute TLVs=E2=80=9D registry correspond=
s to the Peer-Node-SID, an early allocation made to draft-ietf-idr-bgpls-se=
gment-routing-epe [4], which says that &quot;several early implementations =
exist&quot;.</div><div id=3D"bloop_customfont" style=3D"margin:0px"><br></d=
iv><div id=3D"bloop_customfont" style=3D"margin:0px">Are there implementati=
ons of draft-ietf-idr-bgpls-segment-routing-epe with the 1101 code point?=
=C2=A0 Are there deployments of those implementations?</div><div id=3D"bloo=
p_customfont" style=3D"margin:0px"><br></div><div id=3D"bloop_customfont" s=
tyle=3D"margin:0px">Thanks!</div><div id=3D"bloop_customfont" style=3D"marg=
in:0px"><br></div><div id=3D"bloop_customfont" style=3D"margin:0px">Alvaro.=
</div><div id=3D"bloop_customfont" style=3D"margin:0px"><br></div><div id=
=3D"bloop_customfont" style=3D"margin:0px"><br></div><div id=3D"bloop_custo=
mfont" style=3D"margin:0px">[1] <a href=3D"https://datatracker.ietf.org/doc=
/draft-ietf-ospf-link-overload/">https://datatracker.ietf.org/doc/draft-iet=
f-ospf-link-overload/</a>=C2=A0</div><div id=3D"bloop_customfont" style=3D"=
margin:0px">[2] <a href=3D"https://www.iana.org/assignments/bgp-ls-paramete=
rs/bgp-ls-parameters.xhtml#nlri-types">https://www.iana.org/assignments/bgp=
-ls-parameters/bgp-ls-parameters.xhtml#nlri-types</a>=C2=A0</div><div id=3D=
"bloop_customfont" style=3D"margin:0px">[3] <a href=3D"https://www.iana.org=
/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#node-descriptor-link=
-descriptor-prefix-descriptor-attribute-tlv">https://www.iana.org/assignmen=
ts/bgp-ls-parameters/bgp-ls-parameters.xhtml#node-descriptor-link-descripto=
r-prefix-descriptor-attribute-tlv</a>=C2=A0</div><div id=3D"bloop_customfon=
t" style=3D"margin:0px">[4] <a href=3D"https://datatracker.ietf.org/doc/dra=
ft-ietf-idr-bgpls-segment-routing-epe/">https://datatracker.ietf.org/doc/dr=
aft-ietf-idr-bgpls-segment-routing-epe/</a>=C2=A0</div></div><br><div id=3D=
"bloop_sign_1523040565449729024" class=3D"bloop_sign"></div></body></html>

--0000000000003ec4b80569328c54--


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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/za0XkxCk-BGO496bMXnmGIWwW6U>
Subject: Re: [Idr] WGLC for draft-ietf-idr-te-pm-bgp-10 (to end April 5, 2018)
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--Apple-Mail=_88EBD64A-B9D0-43F2-8DE6-2C0085DDB3F5
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Hi All,

Here is the status of this WGLC:

- Jeff, Les and Stefano replied to the IPR call, thanks! Clarence =
didn't, however I see we had a previous thread in July 2017, titled "IPR =
Call for draft-ietf-idr-bgp-ls-segment-routing-ext prior to WG LC", to =
which he did reply. Qin Wu is listed as an author and has not replied. =
Ketan Talaulikar is listed as a Contributor and has not replied. (There =
are currently no IPR disclosures for the draft, =
https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&id=3Ddraft-ietf-id=
r-te-pm-bgp)
- On March 21 Acee sent a set of editorial comments. They look ready to =
be fed into patch(1). Maybe do that, or if the authors don't want to =
accept the comments, please discuss.
- The following people (who are not authors or contributors) replied =
with support: Gaurav Dawra, Acee Lindem, Jeffrey Haas. This is a little =
bit on the light side.

Ketan, Qin, can you reply to the IPR question?
Authors, can you address Acee's comments?
WG, if there are any further comments beyond the three noted above, =
please follow up to this thread.

Thanks,

--John

>=20
> On Mar 21, 2018, at 5:51 AM, John Scudder <jgs@juniper.net> wrote:
>=20
> Hi All,
>=20
> The authors have requested a working group last call for =
draft-ietf-idr-te-pm-bgp-10. Please send your comments to the list =
before Thursday April 5.
>=20
> https://datatracker.ietf.org/doc/draft-ietf-idr-te-pm-bgp/
>=20
> Authors, please reply indicating if you're aware of any relevant IPR. =
Thanks.
>=20
> --John


--Apple-Mail=_88EBD64A-B9D0-43F2-8DE6-2C0085DDB3F5
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Hi All,<div class=3D""><br class=3D""></div><div =
class=3D"">Here is the status of this WGLC:</div><div class=3D""><br =
class=3D""></div><div class=3D"">- Jeff, Les and Stefano replied to the =
IPR call, thanks! Clarence didn't, however I see we had a previous =
thread in July 2017, titled "<span style=3D"color: rgba(0, 0, 0, =
0.85098); font-family: 'Helvetica Neue';" class=3D"">IPR Call for =
draft-ietf-idr-bgp-ls-segment-routing-ext prior to WG LC", to which he =
did reply.&nbsp;</span><font color=3D"rgba(0, 0, 0, 0.85098)" =
face=3D"Helvetica Neue" class=3D"">Qin Wu is listed as an author and has =
not replied.&nbsp;</font><font color=3D"#000085" face=3D"Helvetica Neue" =
class=3D"">Ketan Talaulikar is listed as a Contributor and has not =
replied. (There are currently no IPR disclosures for the draft,&nbsp;<a =
href=3D"https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&amp;id=3Dd=
raft-ietf-idr-te-pm-bgp" =
class=3D"">https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&amp;id=3D=
draft-ietf-idr-te-pm-bgp</a>)</font></div><div class=3D""><font =
color=3D"#000085" face=3D"Helvetica Neue" class=3D"">- On March 21 Acee =
sent a set of editorial comments. They look ready to be fed into =
patch(1). Maybe do that, or if the authors don't want to accept the =
comments, please discuss.</font></div><div class=3D""><font =
color=3D"#000085" face=3D"Helvetica Neue" class=3D"">- The following =
people (who are not authors or contributors) replied with support: =
Gaurav Dawra, Acee Lindem, Jeffrey Haas. This is a little bit on the =
light side.</font></div><div class=3D""><font color=3D"#000085" =
face=3D"Helvetica Neue" class=3D""><br class=3D""></font></div><div =
class=3D"">Ketan, Qin, can you reply to the IPR question?</div><div =
class=3D"">Authors, can you address Acee's comments?</div><div =
class=3D"">WG, if there are any further comments beyond the three noted =
above, please follow up to this thread.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Thanks,</div><div class=3D""><br =
class=3D""></div><div class=3D"">--John</div><div class=3D""><br =
class=3D""></div><div class=3D""><div><blockquote type=3D"cite" =
class=3D""><div class=3D""><br class=3D""></div><div class=3D"">On Mar =
21, 2018, at 5:51 AM, John Scudder &lt;<a href=3D"mailto:jgs@juniper.net" =
class=3D"">jgs@juniper.net</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div class=3D"">Hi =
All,<br class=3D""><br class=3D"">The authors have requested a working =
group last call for draft-ietf-idr-te-pm-bgp-10. Please send your =
comments to the list before Thursday April 5.<br class=3D""><br =
class=3D""><a =
href=3D"https://datatracker.ietf.org/doc/draft-ietf-idr-te-pm-bgp/" =
class=3D"">https://datatracker.ietf.org/doc/draft-ietf-idr-te-pm-bgp/</a><=
br class=3D""><br class=3D"">Authors, please reply indicating if you're =
aware of any relevant IPR. Thanks.<br class=3D""><br =
class=3D"">--John</div></div></blockquote></div><br =
class=3D""></div></body></html>=

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Alvaro Retana <aretana.ietf@gmail.com>, "idr@ietf.org" <idr@ietf.org>
CC: "draft-ietf-ospf-link-overload@ietf.org" <draft-ietf-ospf-link-overload@ietf.org>, "draft-ietf-idr-bgpls-segment-routing-epe@ietf.org" <draft-ietf-idr-bgpls-segment-routing-epe@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
Thread-Topic: Implementations of draft-ietf-idr-bgpls-segment-routing-epe (draft-ietf-ospf-link-overload)
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Date: Fri, 6 Apr 2018 22:05:50 +0000
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Subject: Re: [Idr] Implementations of draft-ietf-idr-bgpls-segment-routing-epe (draft-ietf-ospf-link-overload)
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: John Scudder <jgs@juniper.net>, IDR <idr@ietf.org>, Qin Wu <bill.wu@huawei.com>
Thread-Topic: WGLC for draft-ietf-idr-te-pm-bgp-10 (to end April 5, 2018)
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Date: Sat, 7 Apr 2018 09:24:08 +0000
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Subject: Re: [Idr] WGLC for draft-ietf-idr-te-pm-bgp-10 (to end April 5, 2018)
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Hi John/All,

Apologies for missing to respond on this IPR call.

I am not aware of any IPR related to this draft.

Thanks,
Ketan

From: John Scudder <jgs@juniper.net>
Sent: 07 April 2018 00:26
To: IDR <idr@ietf.org>; Ketan Talaulikar (ketant) <ketant@cisco.com>; Qin W=
u <bill.wu@huawei.com>
Subject: Re: WGLC for draft-ietf-idr-te-pm-bgp-10 (to end April 5, 2018)

Hi All,

Here is the status of this WGLC:

- Jeff, Les and Stefano replied to the IPR call, thanks! Clarence didn't, h=
owever I see we had a previous thread in July 2017, titled "IPR Call for dr=
aft-ietf-idr-bgp-ls-segment-routing-ext prior to WG LC", to which he did re=
ply. Qin Wu is listed as an author and has not replied. Ketan Talaulikar is=
 listed as a Contributor and has not replied. (There are currently no IPR d=
isclosures for the draft, https://datatracker.ietf.org/ipr/search/?submit=
=3Ddraft&id=3Ddraft-ietf-idr-te-pm-bgp)
- On March 21 Acee sent a set of editorial comments. They look ready to be =
fed into patch(1). Maybe do that, or if the authors don't want to accept th=
e comments, please discuss.
- The following people (who are not authors or contributors) replied with s=
upport: Gaurav Dawra, Acee Lindem, Jeffrey Haas. This is a little bit on th=
e light side.

Ketan, Qin, can you reply to the IPR question?
Authors, can you address Acee's comments?
WG, if there are any further comments beyond the three noted above, please =
follow up to this thread.

Thanks,

--John


On Mar 21, 2018, at 5:51 AM, John Scudder <jgs@juniper.net<mailto:jgs@junip=
er.net>> wrote:

Hi All,

The authors have requested a working group last call for draft-ietf-idr-te-=
pm-bgp-10. Please send your comments to the list before Thursday April 5.

https://datatracker.ietf.org/doc/draft-ietf-idr-te-pm-bgp/

Authors, please reply indicating if you're aware of any relevant IPR. Thank=
s.

--John


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<body lang=3D"EN-IN" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi John/Al=
l,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">Apologies =
for missing to respond on this IPR call.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">I am not a=
ware of any IPR related to this draft.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">Thanks,<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">Ketan<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">From:</span></b><span lang=3D"EN-=
US" style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> =
John Scudder &lt;jgs@juniper.net&gt;
<br>
<b>Sent:</b> 07 April 2018 00:26<br>
<b>To:</b> IDR &lt;idr@ietf.org&gt;; Ketan Talaulikar (ketant) &lt;ketant@c=
isco.com&gt;; Qin Wu &lt;bill.wu@huawei.com&gt;<br>
<b>Subject:</b> Re: WGLC for draft-ietf-idr-te-pm-bgp-10 (to end April 5, 2=
018)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hi All,<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Here is the status of this WGLC:<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">- Jeff, Les and Stefano replied to the IPR call, tha=
nks! Clarence didn't, however I see we had a previous thread in July 2017, =
titled &quot;<span style=3D"font-family:&quot;Helvetica Neue&quot;,serif">I=
PR Call for draft-ietf-idr-bgp-ls-segment-routing-ext
 prior to WG LC&quot;, to which he did reply.&nbsp;Qin Wu is listed as an a=
uthor and has not replied.&nbsp;<span style=3D"color:#000085">Ketan Talauli=
kar is listed as a Contributor and has not replied. (There are currently no=
 IPR disclosures for the draft,&nbsp;<a href=3D"https://datatracker.ietf.or=
g/ipr/search/?submit=3Ddraft&amp;id=3Ddraft-ietf-idr-te-pm-bgp">https://dat=
atracker.ietf.org/ipr/search/?submit=3Ddraft&amp;id=3Ddraft-ietf-idr-te-pm-=
bgp</a>)</span></span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Helvetica Neue&quot=
;,serif;color:#000085">- On March 21 Acee sent a set of editorial comments.=
 They look ready to be fed into patch(1). Maybe do that, or if the authors =
don't want to accept the comments, please discuss.</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Helvetica Neue&quot=
;,serif;color:#000085">- The following people (who are not authors or contr=
ibutors) replied with support: Gaurav Dawra, Acee Lindem, Jeffrey Haas. Thi=
s is a little bit on the light side.</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Ketan, Qin, can you reply to the IPR question?<o:p><=
/o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Authors, can you address Acee's comments?<o:p></o:p>=
</p>
</div>
<div>
<p class=3D"MsoNormal">WG, if there are any further comments beyond the thr=
ee noted above, please follow up to this thread.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">--John<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">On Mar 21, 2018, at 5:51 AM, John Scudder &lt;<a hre=
f=3D"mailto:jgs@juniper.net">jgs@juniper.net</a>&gt; wrote:<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal">Hi All,<br>
<br>
The authors have requested a working group last call for draft-ietf-idr-te-=
pm-bgp-10. Please send your comments to the list before Thursday April 5.<b=
r>
<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-idr-te-pm-bgp/">http=
s://datatracker.ietf.org/doc/draft-ietf-idr-te-pm-bgp/</a><br>
<br>
Authors, please reply indicating if you're aware of any relevant IPR. Thank=
s.<br>
<br>
--John<o:p></o:p></p>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
</body>
</html>

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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, Alvaro Retana <aretana.ietf@gmail.com>, "idr@ietf.org" <idr@ietf.org>
CC: "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, "draft-ietf-ospf-link-overload@ietf.org" <draft-ietf-ospf-link-overload@ietf.org>, "draft-ietf-idr-bgpls-segment-routing-epe@ietf.org" <draft-ietf-idr-bgpls-segment-routing-epe@ietf.org>
Thread-Topic: Implementations of draft-ietf-idr-bgpls-segment-routing-epe (draft-ietf-ospf-link-overload)
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Date: Sat, 7 Apr 2018 09:31:14 +0000
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "John G. Scudder" <jgs@juniper.net>, "draft-ietf-idr-bgp-ls-segment-routing-ext@ietf.org" <draft-ietf-idr-bgp-ls-segment-routing-ext@ietf.org>
CC: Hares Susan <shares@ndzh.com>, idr wg <idr@ietf.org>, Jeffrey Haas <jhaas@pfrc.org>
Thread-Topic: [Idr] WG LC for draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March 21)
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Date: Sat, 7 Apr 2018 09:36:51 +0000
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References: <011201d3b633$0b5fee60$221fcb20$@ndzh.com> <20180315230734.GB6209@pfrc.org> <456779EC-95F0-4325-84DF-728DAC2B3785@juniper.net>
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Subject: Re: [Idr] WG LC for draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March 21)
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Hi John,

I did respond and acknowledge the first point raised by Jeff below and I am=
 waiting to hear about any other comments before publishing that update. I =
will now publish this update early next week.

On the second point, I agree that the point raise should be addressed by a =
separate document that updates RFC7752 and I will get back to the WG on thi=
s.

With regards to the IPR call, as a co-author, I am not aware of any IPR for=
 this draft.

Thanks,
Ketan

From: John G. Scudder <jgs@juniper.net>
Sent: 06 April 2018 23:47
To: draft-ietf-idr-bgp-ls-segment-routing-ext@ietf.org
Cc: Hares Susan <shares@ndzh.com>; idr wg <idr@ietf.org>; Jeffrey Haas <jha=
as@pfrc.org>
Subject: Re: [Idr] WG LC for draft-ietf-idr-bgp-ls-segment-routing-ext-04 (=
March 7 to March 21)

Hi Authors (and WG),

Jeff raised two points during the WGLC:

On Mar 15, 2018, at 7:07 PM, Jeffrey Haas <jhaas@pfrc.org<mailto:jhaas@pfrc=
.org>> wrote:

Minor comments as part of a re-read while waiting on my plane:
RESERVED is not called out in its behavior.  Some place in the document
should mention the usual "MUST be set to zero on send, SHOULD be ignored on
receipt".  Otherwise, it's gibberish in, who knows what out when someone
tries to use this field in the future.

I didn't see this one addressed. Authors, do you plan to update the draft t=
o address the point? I didn't see any other points raised during the WGLC t=
hat would require an update.


There are a number of TLV value fields that may be of variable lengths.  In
many cases, those lengths are inherited from the underlying IGP documents.
What is not documented is the behavior when the TLV is well formed but has
unexpected length values.  Two simple examples:
- Prefix Attribute Flag TLV; varies by IGP
- Preference TLV; must be 1.

Do we treat this as malformed?  Do we ignore the sub-tlv?

This point was discussed between Jeff and Ketan on the list. It seems to me=
 that it does bear further discussion, but that the issue doesn't need to b=
e fixed in this draft nor to be blocking on the conclusion of the WGLC. Ass=
uming the WG feels we should do better, the most obvious thing IMO would be=
 a document that updates RFC 7752.

Finally, authors and contributors, we forgot to ask for the usual IPR decla=
ration as part of the WGLC. If you could please take care of letting us kno=
w whether or not you are aware of any relevant IPR that has not been declar=
ed, that would help conclude the WGLC. (Right now there is no IPR declared,=
 https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&id=3Ddraft-ietf-id=
r-bgp-ls-segment-routing-ext)

Thanks,

--John

--_000_2a7c95df013947ea97d72521dae54f11XCHALN008ciscocom_
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</head>
<body lang=3D"EN-IN" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi John,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">I did resp=
ond and acknowledge the first point raised by Jeff below and I am waiting t=
o hear about any other comments before publishing
 that update. I will now publish this update early next week.<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">On the sec=
ond point, I agree that the point raise should be addressed by a separate d=
ocument that updates RFC7752 and I will get back
 to the WG on this.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">With regar=
ds to the IPR call, as a co-author, I am not aware of any IPR for this draf=
t.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">Thanks,<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">Ketan<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">From:</span></b><span lang=3D"EN-=
US" style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> =
John G. Scudder &lt;jgs@juniper.net&gt;
<br>
<b>Sent:</b> 06 April 2018 23:47<br>
<b>To:</b> draft-ietf-idr-bgp-ls-segment-routing-ext@ietf.org<br>
<b>Cc:</b> Hares Susan &lt;shares@ndzh.com&gt;; idr wg &lt;idr@ietf.org&gt;=
; Jeffrey Haas &lt;jhaas@pfrc.org&gt;<br>
<b>Subject:</b> Re: [Idr] WG LC for draft-ietf-idr-bgp-ls-segment-routing-e=
xt-04 (March 7 to March 21)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hi Authors (and WG),<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Jeff raised two points during the WGLC:<o:p></o:p></=
p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal">On Mar 15, 2018, at 7:07 PM, Jeffrey Haas &lt;<a hre=
f=3D"mailto:jhaas@pfrc.org">jhaas@pfrc.org</a>&gt; wrote:<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:9.0pt;font-family:&quot;Hel=
vetica&quot;,sans-serif">Minor comments as part of a re-read while waiting =
on my plane:<br>
RESERVED is not called out in its behavior. &nbsp;Some place in the documen=
t<br>
should mention the usual &quot;MUST be set to zero on send, SHOULD be ignor=
ed on<br>
receipt&quot;. &nbsp;Otherwise, it's gibberish in, who knows what out when =
someone<br>
tries to use this field in the future.</span><o:p></o:p></p>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">I didn't see this one addressed. Authors, do you pla=
n to update the draft to address the point? I didn't see any other points r=
aised during the WGLC that would require an update.<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><br>
<br>
<o:p></o:p></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:9.0pt;font-family:&quot;Hel=
vetica&quot;,sans-serif">There are a number of TLV value fields that may be=
 of variable lengths. &nbsp;In<br>
many cases, those lengths are inherited from the underlying IGP documents.<=
br>
What is not documented is the behavior when the TLV is well formed but has<=
br>
unexpected length values. &nbsp;Two simple examples:<br>
- Prefix Attribute Flag TLV; varies by IGP<br>
- Preference TLV; must be 1.<br>
<br>
Do we treat this as malformed? &nbsp;Do we ignore the sub-tlv?</span><o:p><=
/o:p></p>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
<div>
<p class=3D"MsoNormal">This point was discussed between Jeff and Ketan on t=
he list. It seems to me that it does bear further discussion, but that the =
issue doesn't need to be fixed in this draft nor to be blocking on the conc=
lusion of the WGLC. Assuming the WG
 feels we should do better, the most obvious thing IMO would be a document =
that updates RFC 7752.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Finally, authors and contributors, we forgot to ask =
for the usual IPR declaration as part of the WGLC. If you could please take=
 care of letting us know whether or not you are aware of any relevant IPR t=
hat has not been declared, that would
 help conclude the WGLC. (Right now there is no IPR declared,&nbsp;<a href=
=3D"https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&amp;id=3Ddraft-=
ietf-idr-bgp-ls-segment-routing-ext">https://datatracker.ietf.org/ipr/searc=
h/?submit=3Ddraft&amp;id=3Ddraft-ietf-idr-bgp-ls-segment-routing-ext</a>)<o=
:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">--John<o:p></o:p></p>
</div>
</div>
</body>
</html>

--_000_2a7c95df013947ea97d72521dae54f11XCHALN008ciscocom_--


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From: Qin Wu <bill.wu@huawei.com>
To: "jgs@juniper.net" <jgs@juniper.net>, "idr@ietf.org" <idr@ietf.org>, "ketant@cisco.com" <ketant@cisco.com>
Thread-Topic: WGLC for draft-ietf-idr-te-pm-bgp-10 (to end April 5, 2018)
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Date: Sat, 7 Apr 2018 12:19:57 +0000
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<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dgb2312">
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</head>
<body lang=3D"EN-IN" link=3D"blue" vlink=3D"purple">
<div>Sorry&nbsp;for&nbsp;late&nbsp;reply,&nbsp;thank&nbsp;for&nbsp;advancin=
g&nbsp;this&nbsp;work.&nbsp;here&nbsp;is&nbsp;my&nbsp;confirmation,&nbsp;I&=
nbsp;am&nbsp;not&nbsp;away&nbsp;of&nbsp;any&nbsp;IPR&nbsp;related&nbsp;to&n=
bsp;this&nbsp;document.<br>
<br>
Sent&nbsp;from&nbsp;HUAWEI&nbsp;AnyOffice</div>
<div name=3D"AnyOffice-Background-Image" style=3D"border-top:1px solid #B5C=
4DF; font-size:14px; line-height:20px; padding:8px">
<div><b>=B7=A2=BC=FE=C8=CB=A3=BA </b>Ketan Talaulikar (ketant)</div>
<div><b>=CA=D5=BC=FE=C8=CB=A3=BA </b>John Scudder; IDR; Qin Wu; </div>
<div><b>=D6=F7=CC=E2=A3=BA </b>RE: WGLC for draft-ietf-idr-te-pm-bgp-10 (to=
 end April 5, 2018)</div>
<div><b>=CA=B1=BC=E4=A3=BA </b>2018-04-07 17:24:20</div>
<div><br>
<br>
</div>
</div>
<div>
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">Hi John/All,</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">Apologies for missing to respond on=
 this IPR call.</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">I am not aware of any IPR related t=
o this draft.</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">Thanks,</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">Ketan</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt; font-family:&quot;C=
alibri&quot;,sans-serif; color:#1F497D">&nbsp;</span></p>
<div>
<div style=3D"border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0c=
m 0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:11.0pt; f=
ont-family:&quot;Calibri&quot;,sans-serif">From:</span></b><span lang=3D"EN=
-US" style=3D"font-size:11.0pt; font-family:&quot;Calibri&quot;,sans-serif"=
> John Scudder &lt;jgs@juniper.net&gt;
<br>
<b>Sent:</b> 07 April 2018 00:26<br>
<b>To:</b> IDR &lt;idr@ietf.org&gt;; Ketan Talaulikar (ketant) &lt;ketant@c=
isco.com&gt;; Qin Wu &lt;bill.wu@huawei.com&gt;<br>
<b>Subject:</b> Re: WGLC for draft-ietf-idr-te-pm-bgp-10 (to end April 5, 2=
018)</span></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Hi All,</p>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal">Here is the status of this WGLC:</p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal">- Jeff, Les and Stefano replied to the IPR call, tha=
nks! Clarence didn't, however I see we had a previous thread in July 2017, =
titled &quot;<span style=3D"font-family:&quot;Helvetica Neue&quot;,serif">I=
PR Call for draft-ietf-idr-bgp-ls-segment-routing-ext
 prior to WG LC&quot;, to which he did reply.&nbsp;Qin Wu is listed as an a=
uthor and has not replied.&nbsp;<span style=3D"color:#000085">Ketan Talauli=
kar is listed as a Contributor and has not replied. (There are currently no=
 IPR disclosures for the draft,&nbsp;<a href=3D"https://datatracker.ietf.or=
g/ipr/search/?submit=3Ddraft&amp;id=3Ddraft-ietf-idr-te-pm-bgp">https://dat=
atracker.ietf.org/ipr/search/?submit=3Ddraft&amp;id=3Ddraft-ietf-idr-te-pm-=
bgp</a>)</span></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Helvetica Neue&quot=
;,serif; color:#000085">- On March 21 Acee sent a set of editorial comments=
. They look ready to be fed into patch(1). Maybe do that, or if the authors=
 don't want to accept the comments, please discuss.</span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Helvetica Neue&quot=
;,serif; color:#000085">- The following people (who are not authors or cont=
ributors) replied with support: Gaurav Dawra, Acee Lindem, Jeffrey Haas. Th=
is is a little bit on the light side.</span></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal">Ketan, Qin, can you reply to the IPR question?</p>
</div>
<div>
<p class=3D"MsoNormal">Authors, can you address Acee's comments?</p>
</div>
<div>
<p class=3D"MsoNormal">WG, if there are any further comments beyond the thr=
ee noted above, please follow up to this thread.</p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal">Thanks,</p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal">--John</p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<div>
<blockquote style=3D"margin-top:5.0pt; margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal">On Mar 21, 2018, at 5:51 AM, John Scudder &lt;<a hre=
f=3D"mailto:jgs@juniper.net">jgs@juniper.net</a>&gt; wrote:</p>
</div>
<p class=3D"MsoNormal">&nbsp;</p>
<div>
<div>
<p class=3D"MsoNormal">Hi All,<br>
<br>
The authors have requested a working group last call for draft-ietf-idr-te-=
pm-bgp-10. Please send your comments to the list before Thursday April 5.<b=
r>
<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-idr-te-pm-bgp/">http=
s://datatracker.ietf.org/doc/draft-ietf-idr-te-pm-bgp/</a><br>
<br>
Authors, please reply indicating if you're aware of any relevant IPR. Thank=
s.<br>
<br>
--John</p>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
</div>
</div>
</body>
</html>

--_000_etPan5ac8b76d1d6db2a9d71QinWudeiPhone_--


From nobody Sat Apr  7 09:31:05 2018
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Subject: [Idr] I-D Action: draft-ietf-idr-bgp-prefix-sid-19.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Segment Routing Prefix SID extensions for BGP
        Authors         : Stefano Previdi
                          Clarence Filsfils
                          Acee Lindem
                          Arjun Sreekantiah
                          Hannes Gredler
	Filename        : draft-ietf-idr-bgp-prefix-sid-19.txt
	Pages           : 17
	Date            : 2018-04-07

Abstract:
   The Segment Routing (SR) architecture allows a node to steer a packet
   flow through any topological path and service chain by leveraging
   source routing.  The ingress node prepends an SR header to a packet
   containing a set of segment identifiers (SID).  Each SID represents a
   topological or a service-based instruction.  Per-flow state is
   maintained only on the ingress node of the SR domain.

   This document defines an optional, transitive BGP attribute for
   announcing BGP Prefix Segment Identifiers (BGP Prefix-SID)
   information.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-prefix-sid/

There are also htmlized versions available at:
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https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-prefix-sid-19

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-bgp-prefix-sid-19


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

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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: "'Ketan Talaulikar \(ketant\)'" <ketant@cisco.com>
Cc: "'Jeffrey Haas'" <jhaas@pfrc.org>, <lsr@ietf.org>, <idr@ietf.org>
References: <008101d3ca60$073f81b0$15be8510$@org.cn> <c5a4d1de5e7943318821018c138b5562@XCH-ALN-008.cisco.com> <1B346347-9242-4EE4-BDA2-F024EF483B8A@tsinghua.org.cn> <aab65c5b06d346d2a5a4ef8cef5ad28b@XCH-ALN-008.cisco.com> <8C26288C-54C3-4C04-91A6-2B99562A1DE9@cisco.com> <5AC32E8B.6090202@cisco.com> <CF9450C5-028B-4B29-9F3A-137254AFF320@previdi.net> <009b01d3cbbb$6bfc3510$43f49f30$@org.cn> <bb5ff9928fb245739ae5480b884f1edd@XCH-ALN-008.cisco.com>
In-Reply-To: <bb5ff9928fb245739ae5480b884f1edd@XCH-ALN-008.cisco.com>
Date: Sun, 8 Apr 2018 09:31:59 +0800
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Hi, Ketan:

=20

I think there is another reason that causes this semantic error-----that =
is there is many similarities for the definition of =E2=80=9CAdj-SID =
Sub-TLV=E2=80=9D for ISIS and OSPFv3 in the following draft:

https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-extens=
ions-11#section-6.1

https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-15=
#section-2.2.1

=20

but there is no any description in the relevant paragraph to  =
distinguish them in BGP-LS document.

https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-ext-04#=
section-2.2.1

=20

Ketan explained that =E2=80=9CISIS uses 1 byte for type/length and has =
LSP space constraints which you would notice in  the protocol encodings. =
OSPF doesn=E2=80=99t have the same challenge and you would notice how =
its TLVs tend to be aligned. BGP-LS is somewhat similar to OSPF from =
these size constraints perspective.=E2=80=9D But when I compared another =
TLV definition =E2=80=9CSRMS Preference TLV=E2=80=9D in randomly, I =
found the definition in BGP-LS is different from that both in ISIS and =
OSPFv3.(include the =E2=80=9Clength=E2=80=9D field and =
=E2=80=9Creserved=E2=80=9D field) I don=E2=80=99t know there are how =
many inconsistence among them and think this will induce other =
inconsistencies when the vendor implements the BGP-LS protocol.

=20

Can we align these definitions as consistence as possible among them? Or =
add clear distinguish statements for the different IGP protocol?

The consumer can add some detections for such kind semantic errors but =
the better is not to produce them.

=20

=20

Best Regards.

=20

Aijun Wang

Network R&D and Operation Support Department

China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.

=E5=8F=91=E4=BB=B6=E4=BA=BA: Ketan Talaulikar (ketant) =
[mailto:ketant@cisco.com]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B44=E6=9C=884=E6=97=A5 =
15:54
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang
=E6=8A=84=E9=80=81: Jeffrey Haas; lsr@ietf.org; idr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] Inconsistence regarding the definition of =
"Adj-SID Sub-TLV" between OSPF and ISIS extension for Segment Routing

=20

< including IDR WG where BGP-LS work is being done >

=20

Hi Aijun,

=20

As discussed offline, this is a bug in this particular implementation =
where it is not following the spec properly.

=20

This goes back to the discussion in the IDR WG about the semantic and =
syntactic validation for BGP-LS messages which Jeff had brought up. In =
this case, my understanding was that there was a semantic error in this =
TLV encoding? The consumer (application/BGP speaker) in this case should =
detect and ignore this update =E2=80=93 which is what was being done as =
well in this case?

=20

Thanks,

Ketan

=20

From: Aijun Wang <wangaijun@tsinghua.org.cn>=20
Sent: 04 April 2018 07:50
To: 'stefano previdi' <stefano@previdi.net>; Peter Psenak (ppsenak) =
<ppsenak@cisco.com>
Cc: lsr@ietf.org; Ketan Talaulikar (ketant) <ketant@cisco.com>; Acee =
Lindem (acee) <acee@cisco.com>
Subject: =E7=AD=94=E5=A4=8D: [Lsr] Inconsistence regarding the =
definition of "Adj-SID Sub-TLV" between OSPF and ISIS extension for =
Segment Routing

=20

Hi, All:

=20

We have found some inconsistencies for the implementation of BGP-LS =
protocol regarding this =E2=80=9CAdj-SID SubTLV =E2=80=9D, please see =
the following screenshot.

I think we should do some works for the related drafts to clarify this =
ambiguous/easy to be ignored definition.

=20



=20

=20

Best Regards.

=20

Aijun Wang

Network R&D and Operation Support Department

China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.

=20

-----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
=E5=8F=91=E4=BB=B6=E4=BA=BA: stefano previdi =
[mailto:stefano@previdi.net]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B44=E6=9C=883=E6=97=A5 =
15:39
=E6=94=B6=E4=BB=B6=E4=BA=BA: Peter Psenak
=E6=8A=84=E9=80=81: lsr@ietf.org; Ketan Talaulikar (ketant); Acee Lindem =
(acee); Aijun Wang
=E4=B8=BB=E9=A2=98: Re: [Lsr] Inconsistence regarding the definition of =
"Adj-SID Sub-TLV" between OSPF and ISIS extension for Segment Routing

=20

me too.=20

=20

If we want to align the encoding, we should probably better align the =
protocol name directly...

=20

s.

=20

=20

> On Apr 3, 2018, at 9:34 AM, Peter Psenak < <mailto:ppsenak@cisco.com> =
ppsenak@cisco.com> wrote:

>=20

> On 02/04/18 14:19 , Acee Lindem (acee) wrote:

>> Speaking as WG member:

>>=20

>> I couldn=E2=80=99t agree more with Ketan. No changes are required to =
these=20

>> documents.

>=20

> as a coauthor of the OSPF/OSPFv3 SR drafts, I fully agree.

>=20

> thanks,

> Peter

>=20

>>=20

>> Thanks,

>>=20

>> Acee

>>=20

>> *From: *Lsr < <mailto:lsr-bounces@ietf.org> lsr-bounces@ietf.org> on =
behalf of "Ketan Talaulikar=20

>> (ketant)" < <mailto:ketant@cisco.com> ketant@cisco.com>

>> *Date: *Monday, April 2, 2018 at 7:36 AM

>> *To: *Aijun Wang < <mailto:wangaijun@tsinghua.org.cn> =
wangaijun@tsinghua.org.cn>

>> *Cc: *" <mailto:lsr@ietf.org> lsr@ietf.org" < <mailto:lsr@ietf.org> =
lsr@ietf.org>

>> *Subject: *Re: [Lsr] Inconsistence regarding the definition of=20

>> "Adj-SID Sub-TLV" between OSPF and ISIS extension for Segment Routing

>>=20

>> Hi Aijun,

>>=20

>> I understand what you are referring to now, but these are not=20

>> inconsistencies. ISIS, OSPF and BGP-LS are 3 different protocols.=20

>> Their encodings may not all be the same. ISIS uses 1 byte for=20

>> type/length and has LSP space constraints which you would notice in=20

>> the protocol encodings. OSPF doesn=E2=80=99t have the same challenge =
and you=20

>> would notice how its TLVs tend to be aligned. BGP-LS is somewhat=20

>> similar to OSPF from these size constraints perspective.

>>=20

>> I do not see the implementation challenges in encoding from the two=20

>> IGPs into BGP-LS. It does not make sense to change any of the=20

>> protocol encodings that you ask for currently since implementations=20

>> have been shipping with them for many years.

>>=20

>> IMHO it is not necessary to put such constraints for what you call=20

>> =E2=80=9Cconsistency=E2=80=9D on these 3 protocol encodings in the =
future. However,=20

>> we do try to be consistent in semantics as much as possible.

>>=20

>> Thanks,

>>=20

>> Ketan

>>=20

>> *From:*Aijun Wang < <mailto:wangaijun@tsinghua.org.cn> =
wangaijun@tsinghua.org.cn>

>> *Sent:* 02 April 2018 16:52

>> *To:* Ketan Talaulikar (ketant) < <mailto:ketant@cisco.com> =
ketant@cisco.com>

>> *Cc:*  <mailto:lsr@ietf.org> lsr@ietf.org

>> *Subject:* Re: [Lsr] Inconsistence regarding the definition of=20

>> "Adj-SID Sub-TLV" between OSPF and ISIS extension for Segment Routing

>>=20

>> Hi, Ketan:

>>=20

>> There is one two-bytes =E2=80=9CReserved=E2=80=9D field in =
=E2=80=9CAdjacency Segment=20

>> Identifier=E2=80=9D TLV for OSPF extension, but this field =
doesn=E2=80=99t exist in=20

>> the corresponding TLV for ISIS extension. Every other fields are =
same.

>>=20

>> Corresponding definition in BGP-LS is similar with OSPF(not similar=20

>> with ISIS as I mentioned in previous mail). Then when the router=20

>> reports/redistributes the ISIS LSDB information to BGP protocol, the=20

>> router must add two bytes to the =E2=80=9Clength=E2=80=9D field and =
add/stuff the=20

>> =E2=80=9Creserved=E2=80=9D field; but for OSPF LSDB, the router need =
only copy the=20

>> corresponding fields according.

>>=20

>> We have found the error arises from this inconsistency from the real=20

>> router and think it is better to align this definition in different=20

>> IGP protocol.

>>=20

>> Update to ISIS related extensions draft may be easier.

>>=20

>> Aijun Wang

>>=20

>> China Telecom

>>=20

>>=20

>> =E5=9C=A8 =
2018=E5=B9=B44=E6=9C=882=E6=97=A5=EF=BC=8C18:26=EF=BC=8CKetan Talaulikar =
(ketant)=20

>> < <mailto:ketant@cisco.com%3cmailto:ketant@cisco.com> =
ketant@cisco.com<mailto:ketant@cisco.com>> =E5=86=99=E9=81=93=EF=BC=9A

>>=20

>>    Hi Aijun,

>>=20

>>    Can you clarify what you mean by =
=E2=80=9Cinconsistencies=E2=80=9D?

>>=20

>>    Also, you are referring the old version of OSPFv3 SR draft before =
it

>>    was aligned with the OSPFv2 SR draft. Please check

>>   =20

>>  =
<https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-ex> =
https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-ex

>> tensions-11#section-6.1

>>=20

>>    OSPF and ISIS are different protocols and there are some =
differences

>>    between them. I would not call them inconsistencies. BGP-LS spec

>>    refers to the individual IGP drafts for interpretation of flags. =
So

>>    please specifically point out what inconsistency you are referring =
to.

>>=20

>>    Thanks,

>>=20

>>    Ketan

>>=20

>>    *From:*Lsr < =
<mailto:lsr-bounces@ietf.org%3cmailto:lsr-bounces@ietf.org> =
lsr-bounces@ietf.org<mailto:lsr-bounces@ietf.org>> *On

>>    Behalf Of *Aijun Wang

>>    *Sent:* 02 April 2018 14:23

>>    *To:*  <mailto:lsr@ietf.org%3cmailto:lsr@ietf.org> =
lsr@ietf.org<mailto:lsr@ietf.org>

>>    *Subject:* [Lsr] Inconsistence regarding the definition of =
"Adj-SID

>>    Sub-TLV" between OSPF and ISIS extension for Segment Routing

>>=20

>>    Hi, All:

>>=20

>>    We found there were some inconsistences for the definition of

>>    =E2=80=9CAdjacency Segment Identifier=E2=80=9D between OSPF and =
ISIS extension for

>>    segment routing, please see the link below for comparison.

>>=20

>>   =20

>>  =
<https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extension> =
https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extension

>> s-15#section-2.2.1

>>=20

>>   =20

>>  =
<https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-ex> =
https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-ex

>> tensions-10#section-7.1

>>=20

>>    Here we want to know is there any reason for this inconsistence? =
We

>>    think this inconsistence can easily cause error for BGP-LS

>>    implementation for segment routing extension, as that defined in

>>     =
<https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-ext-04=
#section-2.2.1> =
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-ext-04#=
section-2.2.1,

>>    which is similar with ISIS extension for SR, but different from =
OSPF

>>    extension for SR.

>>=20

>>    Do we need to make them consistent? It seems change the definition

>>    in OSPF extension may be less influence for the existing related =
drafts.

>>=20

>>    Best Regards.

>>=20

>>    Aijun Wang

>>=20

>>    Network R&D and Operation Support Department

>>=20

>>    China Telecom Corporation Limited Beijing Research

>>    Institute,Beijing, China.

>>=20

>>    _______________________________________________

>>    Lsr mailing list

>>     <mailto:Lsr@ietf.org%3cmailto:Lsr@ietf.org> =
Lsr@ietf.org<mailto:Lsr@ietf.org>

>>     <https://www.ietf.org/mailman/listinfo/lsr> =
https://www.ietf.org/mailman/listinfo/lsr

>>=20

>>=20

>>=20

>> _______________________________________________

>> Lsr mailing list

>>  <mailto:Lsr@ietf.org> Lsr@ietf.org

>>  <https://www.ietf.org/mailman/listinfo/lsr> =
https://www.ietf.org/mailman/listinfo/lsr

>>=20

>=20

> _______________________________________________

> Lsr mailing list

>  <mailto:Lsr@ietf.org> Lsr@ietf.org

>  <https://www.ietf.org/mailman/listinfo/lsr> =
https://www.ietf.org/mailman/listinfo/lsr

=20

_______________________________________________

Lsr mailing list

 <mailto:Lsr@ietf.org> Lsr@ietf.org

 <https://www.ietf.org/mailman/listinfo/lsr> =
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vlink=3Dpurple style=3D'text-justify-trim:punctuation'><div =
class=3DWordSection1><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'>Hi, Ketan:<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>I think =
there is another reason that causes this semantic error-----that is =
there is many similarities for the definition of =E2=80=9CAdj-SID =
Sub-TLV=E2=80=9D for ISIS and OSPFv3 in the following =
draft:<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><a =
href=3D"https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routin=
g-extensions-11#section-6.1">https://tools.ietf.org/html/draft-ietf-ospf-=
ospfv3-segment-routing-extensions-11#section-6.1</a><o:p></o:p></span></p=
><p class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'><a =
href=3D"https://tools.ietf.org/html/draft-ietf-isis-segment-routing-exten=
sions-15#section-2.2.1">https://tools.ietf.org/html/draft-ietf-isis-segme=
nt-routing-extensions-15#section-2.2.1</a><o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>but there =
is no any description in the relevant paragraph to =C2=A0distinguish =
them in BGP-LS document.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:#1F497D'><a =
href=3D"https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing=
-ext-04#section-2.2.1">https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-=
segment-routing-ext-04#section-2.2.1</a><o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US style=3D'color:#1F497D'>Ketan =
explained that =E2=80=9C</span><span lang=3DEN-US>ISIS uses 1 byte for =
type/length and has LSP space constraints which you would notice in =
=C2=A0the protocol encodings. OSPF doesn</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=99</span><span lang=3DEN-US>t =
have the same challenge and you would notice how its TLVs tend to be =
aligned. BGP-LS is somewhat similar to OSPF from these size constraints =
perspective.</span><span lang=3DEN-US style=3D'color:#1F497D'>=E2=80=9D =
But when I compared another TLV definition =E2=80=9CSRMS Preference =
TLV=E2=80=9D in randomly, I found the definition in BGP-LS is different =
from that both in ISIS and OSPFv3.(include the =E2=80=9Clength=E2=80=9D =
field and =E2=80=9Creserved=E2=80=9D field) I don=E2=80=99t know there =
are how many inconsistence among them and think this will induce other =
inconsistencies when the vendor implements the BGP-LS =
protocol.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US style=3D'color:#1F497D'>Can we =
align these definitions as consistence as possible among them? Or add =
clear distinguish statements for the different IGP =
protocol?<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US style=3D'color:#1F497D'>The consumer can add some =
detections for such kind semantic errors but the better is not to =
produce them.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'>Network R&amp;D and Operation Support =
Department<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'>China Telecom Corporation Limited Beijing =
Research Institute,Beijing, China.<o:p></o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E4=BB=
=B6=E4=BA=BA<span lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> Ketan =
Talaulikar (ketant) [mailto:ketant@cisco.com] <br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E9=80=
=81=E6=97=B6=E9=97=B4<span lang=3DEN-US>:</span></span></b><span =
lang=3DEN-US style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> =
2018</span><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4<span =
lang=3DEN-US>4</span>=E6=9C=88<span lang=3DEN-US>4</span>=E6=97=A5<span =
lang=3DEN-US> 15:54<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun =
Wang<br></span><b>=E6=8A=84=E9=80=81<span lang=3DEN-US>:</span></b><span =
lang=3DEN-US> Jeffrey Haas; lsr@ietf.org; =
idr@ietf.org<br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [Lsr] Inconsistence =
regarding the definition of &quot;Adj-SID Sub-TLV&quot; between OSPF and =
ISIS extension for Segment =
Routing<o:p></o:p></span></span></p></div></div><p class=3DMsoNormal =
align=3Dleft style=3D'text-align:left'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-IN style=3D'font-size:11.0pt;color:#1F497D'>&lt; including IDR =
WG where BGP-LS work is being done &gt;<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>Hi =
Aijun,<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>As discussed offline, this is a =
bug in this particular implementation where it is not following the spec =
properly.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>This goes back to the =
discussion in the IDR WG about the semantic and syntactic validation for =
BGP-LS messages which Jeff had brought up. In this case, my =
understanding was that there was a semantic error in this TLV encoding? =
The consumer (application/BGP speaker) in this case should detect and =
ignore this update =E2=80=93 which is what was being done as well in =
this case?<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>Thanks,<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>Ketan<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><div=
><div style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt =
0cm 0cm 0cm'><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><b><span lang=3DEN-US =
style=3D'font-size:11.0pt'>From:</span></b><span lang=3DEN-US =
style=3D'font-size:11.0pt'> Aijun Wang &lt;<a =
href=3D"mailto:wangaijun@tsinghua.org.cn">wangaijun@tsinghua.org.cn</a>&g=
t; <br><b>Sent:</b> 04 April 2018 07:50<br><b>To:</b> 'stefano previdi' =
&lt;<a href=3D"mailto:stefano@previdi.net">stefano@previdi.net</a>&gt;; =
Peter Psenak (ppsenak) &lt;<a =
href=3D"mailto:ppsenak@cisco.com">ppsenak@cisco.com</a>&gt;<br><b>Cc:</b>=
 <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a>; Ketan Talaulikar =
(ketant) &lt;<a =
href=3D"mailto:ketant@cisco.com">ketant@cisco.com</a>&gt;; Acee Lindem =
(acee) &lt;<a =
href=3D"mailto:acee@cisco.com">acee@cisco.com</a>&gt;<br><b>Subject:</b> =
</span><span style=3D'font-size:11.0pt;font-family:"MS =
Gothic"'>=E7=AD=94=E5=A4=8D</span><span lang=3DEN-US =
style=3D'font-size:11.0pt'>: [Lsr] Inconsistence regarding the =
definition of &quot;Adj-SID Sub-TLV&quot; between OSPF and ISIS =
extension for Segment Routing<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal align=3Dleft style=3D'text-align:left'><span =
lang=3DEN-IN><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>Hi, All:<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>We have found some inconsistencies for the implementation =
of BGP-LS protocol regarding this </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9C</span><span =
lang=3DEN-US>Adj-SID SubTLV </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span lang=3DEN-US>, =
please see the following screenshot.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>I think we should do some works =
for the related drafts to clarify this ambiguous/easy to be ignored =
definition.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><img border=3D0 width=3D818 height=3D316 =
id=3D"_x0000_i1037" =
src=3D"cid:image001.png@01D3CF17.F0542480"><o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Aijun Wang<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Network R&amp;D and Operation Support =
Department<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>China Telecom Corporation Limited Beijing Research =
Institute,Beijing, China.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>-----</span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=
=B6</span><span lang=3DEN-US>-----<br></span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E4=BB=B6=E4=BA=BA</spa=
n><span lang=3DEN-US>: stefano previdi [<a =
href=3D"mailto:stefano@previdi.net">mailto:stefano@previdi.net</a>] =
<br></span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=
=B4</span><span lang=3DEN-US>: 2018</span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4</span><span =
lang=3DEN-US>4</span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E6=9C=88</span><span =
lang=3DEN-US>3</span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E6=97=A5</span><span =
lang=3DEN-US> 15:39<br></span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E6=94=B6=E4=BB=B6=E4=BA=BA</spa=
n><span lang=3DEN-US>: Peter Psenak<br></span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E6=8A=84=E9=80=81</span><span =
lang=3DEN-US>: <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a>; Ketan =
Talaulikar (ketant); Acee Lindem (acee); Aijun Wang<br></span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E4=B8=BB=E9=A2=98</span><span =
lang=3DEN-US>: Re: [Lsr] Inconsistence regarding the definition of =
&quot;Adj-SID Sub-TLV&quot; between OSPF and ISIS extension for Segment =
Routing<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>me too. <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>If we want to align the encoding, we should probably better =
align the protocol name directly...<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>s.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; On Apr 3, 2018, at 9:34 AM, =
Peter Psenak &lt;<a href=3D"mailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>ppsenak@cisco.com</span><=
/a>&gt; wrote:<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; On 02/04/18 14:19 , Acee Lindem (acee) =
wrote:<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Speaking as WG member:<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; I couldn</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=99</span><span lang=3DEN-US>t =
agree more with Ketan. No changes are required to these =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; documents.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; as a coauthor of the =
OSPF/OSPFv3 SR drafts, I fully agree.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; =
thanks,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; Peter<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Thanks,<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Acee<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; *From: *Lsr &lt;<a =
href=3D"mailto:lsr-bounces@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr-bounces@ietf.org</spa=
n></a>&gt; on behalf of &quot;Ketan Talaulikar <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; (ketant)&quot; &lt;<a =
href=3D"mailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>ketant@cisco.com</span></=
a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; *Date: *Monday, April 2, 2018 at 7:36 =
AM<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; *To: *Aijun Wang &lt;<a =
href=3D"mailto:wangaijun@tsinghua.org.cn"><span =
style=3D'color:windowtext;text-decoration:none'>wangaijun@tsinghua.org.cn=
</span></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; *Cc: *&quot;<a href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr@ietf.org</span></a>&q=
uot; &lt;<a href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr@ietf.org</span></a>&g=
t;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; *Subject: *Re: [Lsr] Inconsistence regarding the =
definition of <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; &quot;Adj-SID Sub-TLV&quot; between OSPF and ISIS =
extension for Segment Routing<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Hi Aijun,<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; I understand what you are referring to now, but =
these are not <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; inconsistencies. ISIS, OSPF and BGP-LS are 3 =
different protocols. <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Their encodings may not all be the same. ISIS uses =
1 byte for <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; type/length and has LSP space constraints which =
you would notice in <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; the protocol encodings. OSPF doesn</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>=E2=80=99</span><span =
lang=3DEN-US>t have the same challenge and you <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; would notice how its =
TLVs tend to be aligned. BGP-LS is somewhat <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; similar to OSPF from =
these size constraints perspective.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; I do not see the implementation challenges in =
encoding from the two <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; IGPs into BGP-LS. It =
does not make sense to change any of the <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; protocol encodings that =
you ask for currently since implementations <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; have been shipping with =
them for many years.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; IMHO it is not =
necessary to put such constraints for what you call =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9C</span><span =
lang=3DEN-US>consistency</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span lang=3DEN-US> =
on these 3 protocol encodings in the future. However, =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; we do try to be consistent in semantics as much as =
possible.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
Thanks,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
Ketan<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; *From:*Aijun Wang =
&lt;<a href=3D"mailto:wangaijun@tsinghua.org.cn"><span =
style=3D'color:windowtext;text-decoration:none'>wangaijun@tsinghua.org.cn=
</span></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; *Sent:* 02 April 2018 =
16:52<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; *To:* Ketan Talaulikar (ketant) &lt;<a =
href=3D"mailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>ketant@cisco.com</span></=
a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; *Cc:* <a href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr@ietf.org</span></a><o=
:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
*Subject:* Re: [Lsr] Inconsistence regarding the definition of =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; &quot;Adj-SID Sub-TLV&quot; between OSPF and ISIS =
extension for Segment Routing<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Hi, Ketan:<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; There is one two-bytes </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9C</span><span =
lang=3DEN-US>Reserved</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span lang=3DEN-US> =
field in </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>=E2=80=9C</span><span lang=3DEN-US>Adjacency Segment =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Identifier</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span lang=3DEN-US> =
TLV for OSPF extension, but this field doesn</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=99</span><span lang=3DEN-US>t =
exist in <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; the corresponding TLV for ISIS extension. Every =
other fields are same.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Corresponding definition in BGP-LS is similar with =
OSPF(not similar <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; with ISIS as I mentioned in previous mail). Then =
when the router <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; reports/redistributes the ISIS LSDB information to =
BGP protocol, the <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; router must add two bytes to the </span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>=E2=80=9C</span><span =
lang=3DEN-US>length</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span lang=3DEN-US> =
field and add/stuff the <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; </span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>=E2=80=9C</span><span =
lang=3DEN-US>reserved</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span lang=3DEN-US> =
field; but for OSPF LSDB, the router need only copy the =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; corresponding fields =
according.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; We have found the error =
arises from this inconsistency from the real <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; router and think it is =
better to align this definition in different <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; IGP =
protocol.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; Update to ISIS related =
extensions draft may be easier.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Aijun Wang<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; China Telecom<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; </span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E5=9C=A8</span><span =
lang=3DEN-US> 2018</span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4</span><span =
lang=3DEN-US>4</span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E6=9C=88</span><span =
lang=3DEN-US>2</span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E6=97=A5=EF=BC=8C</span><span =
lang=3DEN-US>18:26</span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=EF=BC=8C</span><span =
lang=3DEN-US>Ketan Talaulikar (ketant) <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; &lt;<a =
href=3D"mailto:ketant@cisco.com%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>ketant@cisco.com&lt;mailt=
o:ketant@cisco.com</span></a>&gt;&gt; </span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E5=86=99=E9=81=93=EF=BC=9A</spa=
n><span lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Hi =
Aijun,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Can =
you clarify what you mean by </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9C</span><span =
lang=3DEN-US>inconsistencies</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span =
lang=3DEN-US>?<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Also, =
you are referring the old version of OSPFv3 SR draft before =
it<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; was aligned with the OSPFv2 SR =
draft. Please check<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; <a =
href=3D"https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routin=
g-ex"><span =
style=3D'color:windowtext;text-decoration:none'>https://tools.ietf.org/ht=
ml/draft-ietf-ospf-ospfv3-segment-routing-ex</span></a><o:p></o:p></span>=
</p><p class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
tensions-11#section-6.1<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; OSPF and ISIS are different =
protocols and there are some differences<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
between them. I would not call them inconsistencies. BGP-LS =
spec<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; refers to the individual IGP =
drafts for interpretation of flags. So<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
please specifically point out what inconsistency you are referring =
to.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
Thanks,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
Ketan<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
*From:*Lsr &lt;<a =
href=3D"mailto:lsr-bounces@ietf.org%3cmailto:lsr-bounces@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr-bounces@ietf.org&lt;m=
ailto:lsr-bounces@ietf.org</span></a>&gt;&gt; =
*On<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Behalf Of *Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; *Sent:* 02 April 2018 =
14:23<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; *To:* <a =
href=3D"mailto:lsr@ietf.org%3cmailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr@ietf.org&lt;mailto:ls=
r@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
*Subject:* [Lsr] Inconsistence regarding the definition of =
&quot;Adj-SID<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Sub-TLV&quot; between OSPF and =
ISIS extension for Segment Routing<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Hi, All:<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; We found there were some =
inconsistences for the definition of<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>=E2=80=9C</span><span lang=3DEN-US>Adjacency Segment =
Identifier</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>=E2=80=9D</span><span lang=3DEN-US> between OSPF and ISIS =
extension for<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; segment routing, please see the =
link below for comparison.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; <a =
href=3D"https://tools.ietf.org/html/draft-ietf-isis-segment-routing-exten=
sion"><span =
style=3D'color:windowtext;text-decoration:none'>https://tools.ietf.org/ht=
ml/draft-ietf-isis-segment-routing-extension</span></a><o:p></o:p></span>=
</p><p class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
s-15#section-2.2.1<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <a =
href=3D"https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routin=
g-ex"><span =
style=3D'color:windowtext;text-decoration:none'>https://tools.ietf.org/ht=
ml/draft-ietf-ospf-ospfv3-segment-routing-ex</span></a><o:p></o:p></span>=
</p><p class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
tensions-10#section-7.1<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Here we want to know is there =
any reason for this inconsistence? We<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; think =
this inconsistence can easily cause error for =
BGP-LS<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; implementation for segment =
routing extension, as that defined in<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; <a =
href=3D"https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing=
-ext-04#section-2.2.1"><span =
style=3D'color:windowtext;text-decoration:none'>https://tools.ietf.org/ht=
ml/draft-ietf-idr-bgp-ls-segment-routing-ext-04#section-2.2.1</span></a>,=
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; which is similar with ISIS =
extension for SR, but different from OSPF<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
extension for SR.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Do we =
need to make them consistent? It seems change the =
definition<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; in OSPF extension may be less =
influence for the existing related drafts.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Best =
Regards.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
Network R&amp;D and Operation Support Department<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; China Telecom Corporation =
Limited Beijing Research<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
Institute,Beijing, China.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
_______________________________________________<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Lsr =
mailing list<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; <a =
href=3D"mailto:Lsr@ietf.org%3cmailto:Lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>Lsr@ietf.org&lt;mailto:Ls=
r@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; <a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr"><span =
style=3D'color:windowtext;text-decoration:none'>https://www.ietf.org/mail=
man/listinfo/lsr</span></a><o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; =
_______________________________________________<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; Lsr mailing =
list<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <a href=3D"mailto:Lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>Lsr@ietf.org</span></a><o=
:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr"><span =
style=3D'color:windowtext;text-decoration:none'>https://www.ietf.org/mail=
man/listinfo/lsr</span></a><o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
_______________________________________________<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; Lsr mailing =
list<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <a href=3D"mailto:Lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>Lsr@ietf.org</span></a><o=
:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; <a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr"><span =
style=3D'color:windowtext;text-decoration:none'>https://www.ietf.org/mail=
man/listinfo/lsr</span></a><o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>_______________________________________________<o:p></o:p></=
span></p><p class=3DMsoPlainText><span lang=3DEN-US>Lsr mailing =
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From: stefano previdi <stefano@previdi.net>
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Date: Mon, 9 Apr 2018 09:34:22 +0200
Cc: draft-ietf-idr-bgp-ls-segment-routing-ext@ietf.org, Hares Susan <shares@ndzh.com>, idr wg <idr@ietf.org>, Jeffrey Haas <jhaas@pfrc.org>
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To: "John G. Scudder" <jgs@juniper.net>
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Subject: Re: [Idr] WG LC for draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March 21)
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Hi John,

I=E2=80=99m not aware of any undisclosed IPR related to this draft.

Thanks.
s.


> On Apr 6, 2018, at 8:17 PM, John G. Scudder <jgs@juniper.net> wrote:
>=20
> Hi Authors (and WG),
>=20
> Jeff raised two points during the WGLC:
>=20
>> On Mar 15, 2018, at 7:07 PM, Jeffrey Haas <jhaas@pfrc.org> wrote:
>>=20
>> Minor comments as part of a re-read while waiting on my plane:
>> RESERVED is not called out in its behavior.  Some place in the =
document
>> should mention the usual "MUST be set to zero on send, SHOULD be =
ignored on
>> receipt".  Otherwise, it's gibberish in, who knows what out when =
someone
>> tries to use this field in the future.
>=20
> I didn't see this one addressed. Authors, do you plan to update the =
draft to address the point? I didn't see any other points raised during =
the WGLC that would require an update.
>=20
>> There are a number of TLV value fields that may be of variable =
lengths.  In
>> many cases, those lengths are inherited from the underlying IGP =
documents.
>> What is not documented is the behavior when the TLV is well formed =
but has
>> unexpected length values.  Two simple examples:
>> - Prefix Attribute Flag TLV; varies by IGP
>> - Preference TLV; must be 1.
>>=20
>> Do we treat this as malformed?  Do we ignore the sub-tlv?
>=20
> This point was discussed between Jeff and Ketan on the list. It seems =
to me that it does bear further discussion, but that the issue doesn't =
need to be fixed in this draft nor to be blocking on the conclusion of =
the WGLC. Assuming the WG feels we should do better, the most obvious =
thing IMO would be a document that updates RFC 7752.
>=20
> Finally, authors and contributors, we forgot to ask for the usual IPR =
declaration as part of the WGLC. If you could please take care of =
letting us know whether or not you are aware of any relevant IPR that =
has not been declared, that would help conclude the WGLC. (Right now =
there is no IPR declared, =
https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&id=3Ddraft-ietf-id=
r-bgp-ls-segment-routing-ext)
>=20
> Thanks,
>=20
> --John


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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Aijun Wang <wangaijun@tsinghua.org.cn>
CC: "'Jeffrey Haas'" <jhaas@pfrc.org>, "lsr@ietf.org" <lsr@ietf.org>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: [Lsr] Inconsistence regarding the definition of "Adj-SID Sub-TLV" between OSPF and ISIS extension for Segment Routing
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Date: Mon, 9 Apr 2018 08:45:24 +0000
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Subject: Re: [Idr] [Lsr] Inconsistence regarding the definition of "Adj-SID Sub-TLV" between OSPF and ISIS extension for Segment Routing
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Cc: draft-ietf-idr-bgp-ls-segment-routing-ext@ietf.org, Hares Susan <shares@ndzh.com>, idr wg <idr@ietf.org>, Jeffrey Haas <jhaas@pfrc.org>
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Subject: Re: [Idr] WG LC for draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March 21)
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hi john,

i am not aware of any undisclosed IPR.

thanks,

/hannes

> On 06.04.2018, at 20:17, John G. Scudder <jgs@juniper.net> wrote:
>=20
> Hi Authors (and WG),
>=20
> Jeff raised two points during the WGLC:
>=20
>> On Mar 15, 2018, at 7:07 PM, Jeffrey Haas <jhaas@pfrc.org> wrote:
>>=20
>> Minor comments as part of a re-read while waiting on my plane:
>> RESERVED is not called out in its behavior.  Some place in the document
>> should mention the usual "MUST be set to zero on send, SHOULD be ignored o=
n
>> receipt".  Otherwise, it's gibberish in, who knows what out when someone
>> tries to use this field in the future.
>=20
> I didn't see this one addressed. Authors, do you plan to update the draft t=
o address the point? I didn't see any other points raised during the WGLC th=
at would require an update.
>=20
>> There are a number of TLV value fields that may be of variable lengths.  I=
n
>> many cases, those lengths are inherited from the underlying IGP documents=
.
>> What is not documented is the behavior when the TLV is well formed but ha=
s
>> unexpected length values.  Two simple examples:
>> - Prefix Attribute Flag TLV; varies by IGP
>> - Preference TLV; must be 1.
>>=20
>> Do we treat this as malformed?  Do we ignore the sub-tlv?
>=20
> This point was discussed between Jeff and Ketan on the list. It seems to m=
e that it does bear further discussion, but that the issue doesn't need to b=
e fixed in this draft nor to be blocking on the conclusion of the WGLC. Assu=
ming the WG feels we should do better, the most obvious thing IMO would be a=
 document that updates RFC 7752.
>=20
> Finally, authors and contributors, we forgot to ask for the usual IPR decl=
aration as part of the WGLC. If you could please take care of letting us kno=
w whether or not you are aware of any relevant IPR that has not been declare=
d, that would help conclude the WGLC. (Right now there is no IPR declared, h=
ttps://datatracker.ietf.org/ipr/search/?submit=3Ddraft&id=3Ddraft-ietf-idr-b=
gp-ls-segment-routing-ext)
>=20
> Thanks,
>=20
> --John

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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></div><div>hi john,</div><div><br></di=
v><div>i am not aware of any undisclosed IPR.</div><div><br></div><div>thank=
s,</div><div><br></div><div>/hannes</div><div><br>On 06.04.2018, at 20:17, J=
ohn G. Scudder &lt;<a href=3D"mailto:jgs@juniper.net">jgs@juniper.net</a>&gt=
; wrote:<br><br></div><blockquote type=3D"cite"><div><meta http-equiv=3D"Con=
tent-Type" content=3D"text/html charset=3Dus-ascii">Hi Authors (and WG),<div=
 class=3D""><br class=3D""></div><div class=3D"">Jeff raised two points duri=
ng the WGLC:<br class=3D""><div class=3D""><br class=3D""><div><blockquote t=
ype=3D"cite" class=3D""><div class=3D"">On Mar 15, 2018, at 7:07 PM, Jeffrey=
 Haas &lt;<a href=3D"mailto:jhaas@pfrc.org" class=3D"">jhaas@pfrc.org</a>&gt=
; wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><span s=
tyle=3D"font-family: Helvetica; font-size: 12px; font-style: normal; font-va=
riant-caps: normal; font-weight: normal; letter-spacing: normal; text-align:=
 start; text-indent: 0px; text-transform: none; white-space: normal; word-sp=
acing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !im=
portant;" class=3D"">Minor comments as part of a re-read while waiting on my=
 plane:</span><br style=3D"font-family: Helvetica; font-size: 12px; font-sty=
le: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: n=
ormal; text-align: start; text-indent: 0px; text-transform: none; white-spac=
e: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><s=
pan style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; fo=
nt-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-a=
lign: start; text-indent: 0px; text-transform: none; white-space: normal; wo=
rd-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inlin=
e !important;" class=3D"">RESERVED is not called out in its behavior. &nbsp;=
Some place in the document</span><br style=3D"font-family: Helvetica; font-s=
ize: 12px; font-style: normal; font-variant-caps: normal; font-weight: norma=
l; letter-spacing: normal; text-align: start; text-indent: 0px; text-transfo=
rm: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width:=
 0px;" class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; fo=
nt-style: normal; font-variant-caps: normal; font-weight: normal; letter-spa=
cing: normal; text-align: start; text-indent: 0px; text-transform: none; whi=
te-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: n=
one; display: inline !important;" class=3D"">should mention the usual "MUST b=
e set to zero on send, SHOULD be ignored on</span><br style=3D"font-family: H=
elvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; fo=
nt-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0=
px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-te=
xt-stroke-width: 0px;" class=3D""><span style=3D"font-family: Helvetica; fon=
t-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: no=
rmal; letter-spacing: normal; text-align: start; text-indent: 0px; text-tran=
sform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-wid=
th: 0px; float: none; display: inline !important;" class=3D"">receipt". &nbs=
p;Otherwise, it's gibberish in, who knows what out when someone</span><br st=
yle=3D"font-family: Helvetica; font-size: 12px; font-style: normal; font-var=
iant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: s=
tart; text-indent: 0px; text-transform: none; white-space: normal; word-spac=
ing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span style=3D"font-fa=
mily: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: nor=
mal; font-weight: normal; letter-spacing: normal; text-align: start; text-in=
dent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -we=
bkit-text-stroke-width: 0px; float: none; display: inline !important;" class=
=3D"">tries to use this field in the future.</span><br style=3D"font-family:=
 Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; f=
ont-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0=
px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-te=
xt-stroke-width: 0px;" class=3D""></div></blockquote><div><br class=3D""></d=
iv><div>I didn't see this one addressed. Authors, do you plan to update the d=
raft to address the point? I didn't see any other points raised during the W=
GLC that would require an update.</div><br class=3D""><blockquote type=3D"ci=
te" class=3D""><div class=3D""><span style=3D"font-family: Helvetica; font-s=
ize: 12px; font-style: normal; font-variant-caps: normal; font-weight: norma=
l; letter-spacing: normal; text-align: start; text-indent: 0px; text-transfo=
rm: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width:=
 0px; float: none; display: inline !important;" class=3D"">There are a numbe=
r of TLV value fields that may be of variable lengths. &nbsp;In</span><br st=
yle=3D"font-family: Helvetica; font-size: 12px; font-style: normal; font-var=
iant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: s=
tart; text-indent: 0px; text-transform: none; white-space: normal; word-spac=
ing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span style=3D"font-fa=
mily: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: nor=
mal; font-weight: normal; letter-spacing: normal; text-align: start; text-in=
dent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -we=
bkit-text-stroke-width: 0px; float: none; display: inline !important;" class=
=3D"">many cases, those lengths are inherited from the underlying IGP docume=
nts.</span><br style=3D"font-family: Helvetica; font-size: 12px; font-style:=
 normal; font-variant-caps: normal; font-weight: normal; letter-spacing: nor=
mal; text-align: start; text-indent: 0px; text-transform: none; white-space:=
 normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><spa=
n style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; font=
-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-ali=
gn: start; text-indent: 0px; text-transform: none; white-space: normal; word=
-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !=
important;" class=3D"">What is not documented is the behavior when the TLV i=
s well formed but has</span><br style=3D"font-family: Helvetica; font-size: 1=
2px; font-style: normal; font-variant-caps: normal; font-weight: normal; let=
ter-spacing: normal; text-align: start; text-indent: 0px; text-transform: no=
ne; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"=
 class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; font-sty=
le: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: n=
ormal; text-align: start; text-indent: 0px; text-transform: none; white-spac=
e: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; d=
isplay: inline !important;" class=3D"">unexpected length values. &nbsp;Two s=
imple examples:</span><br style=3D"font-family: Helvetica; font-size: 12px; f=
ont-style: normal; font-variant-caps: normal; font-weight: normal; letter-sp=
acing: normal; text-align: start; text-indent: 0px; text-transform: none; wh=
ite-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=
=3D""><span style=3D"font-family: Helvetica; font-size: 12px; font-style: no=
rmal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal=
; text-align: start; text-indent: 0px; text-transform: none; white-space: no=
rmal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; displa=
y: inline !important;" class=3D"">- Prefix Attribute Flag TLV; varies by IGP=
</span><br style=3D"font-family: Helvetica; font-size: 12px; font-style: nor=
mal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal;=
 text-align: start; text-indent: 0px; text-transform: none; white-space: nor=
mal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span st=
yle=3D"font-family: Helvetica; font-size: 12px; font-style: normal; font-var=
iant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: s=
tart; text-indent: 0px; text-transform: none; white-space: normal; word-spac=
ing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !impo=
rtant;" class=3D"">- Preference TLV; must be 1.</span><br style=3D"font-fami=
ly: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: norma=
l; font-weight: normal; letter-spacing: normal; text-align: start; text-inde=
nt: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webk=
it-text-stroke-width: 0px;" class=3D""><br style=3D"font-family: Helvetica; f=
ont-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: n=
ormal; letter-spacing: normal; text-align: start; text-indent: 0px; text-tra=
nsform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-wi=
dth: 0px;" class=3D""><span style=3D"font-family: Helvetica; font-size: 12px=
; font-style: normal; font-variant-caps: normal; font-weight: normal; letter=
-spacing: normal; text-align: start; text-indent: 0px; text-transform: none;=
 white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; flo=
at: none; display: inline !important;" class=3D"">Do we treat this as malfor=
med? &nbsp;Do we ignore the sub-tlv?</span><br style=3D"font-family: Helveti=
ca; font-size: 12px; font-style: normal; font-variant-caps: normal; font-wei=
ght: normal; letter-spacing: normal; text-align: start; text-indent: 0px; te=
xt-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-str=
oke-width: 0px;" class=3D""></div></blockquote></div><br class=3D""></div></=
div><div class=3D"">This point was discussed between Jeff and Ketan on the l=
ist. It seems to me that it does bear further discussion, but that the issue=
 doesn't need to be fixed in this draft nor to be blocking on the conclusion=
 of the WGLC. Assuming the WG feels we should do better, the most obvious th=
ing IMO would be a document that updates RFC 7752.</div><div class=3D""><br c=
lass=3D""></div><div class=3D"">Finally, authors and contributors, we forgot=
 to ask for the usual IPR declaration as part of the WGLC. If you could plea=
se take care of letting us know whether or not you are aware of any relevant=
 IPR that has not been declared, that would help conclude the WGLC. (Right n=
ow there is no IPR declared,&nbsp;<a href=3D"https://datatracker.ietf.org/ip=
r/search/?submit=3Ddraft&amp;id=3Ddraft-ietf-idr-bgp-ls-segment-routing-ext"=
 class=3D"">https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&amp;id=3D=
draft-ietf-idr-bgp-ls-segment-routing-ext</a>)</div><div class=3D""><br clas=
s=3D""></div><div class=3D"">Thanks,</div><div class=3D""><br class=3D""></d=
iv><div class=3D"">--John</div></div></blockquote></body></html>=

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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/f6FyRTc4yYR24GbPPctE0doFmLQ>
Subject: [Idr] Fwd: [IANA #1054018] Early allocation request for draft-ietf-idr-eag-distribution
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FYI

> Begin forwarded message:
>=20
> From: Sabrina Tanamal via RT <iana-prot-param@iana.org>
> Subject: [IANA #1054018] Early allocation request for =
draft-ietf-idr-eag-distribution
> Date: April 9, 2018 at 5:10:18 PM EDT
> Cc: <jgs@juniper.net>, <aretana.ietf@gmail.com>, <idr-chairs@ietf.org>
> Reply-To: <iana-prot-param@iana.org>
>=20
> Hi all,=20
>=20
> We've made the following early allocation in the BGP-LS Node =
Descriptor, Link Descriptor, Prefix Descriptor, and Attribute TLVs =
registry, in accordance with RFC 7120:=20
>=20
> 1173	Extended Administrative Group (TEMPORARY - registered =
2018-04-09, expires 2019-04-09)	22/14	=
[draft-ietf-idr-eag-distribution][RFC7308]
>=20
> When the IESG notifies us that they've approved the document for =
publication, we'll update the reference and remove the "temporary" note. =
If the document hasn't been approved within roughly 60 days of the =
expiration date, we'll ask you whether you want to renew the allocation =
for one more year. A renewal for a third year would require approval =
from the IESG.
>=20
> Best regards,=20
>=20
> Sabrina Tanamal
> Senior IANA Services Specialist=20


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">FYI<br class=3D""><div><br class=3D""><blockquote type=3D"cite"=
 class=3D""><div class=3D"">Begin forwarded message:</div><br =
class=3D"Apple-interchange-newline"><div style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=3D""><span=
 style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">From: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D"">Sabrina Tanamal via RT &lt;<a =
href=3D"mailto:iana-prot-param@iana.org" =
class=3D"">iana-prot-param@iana.org</a>&gt;<br =
class=3D""></span></div><div style=3D"margin-top: 0px; margin-right: =
0px; margin-bottom: 0px; margin-left: 0px;" class=3D""><span =
style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Subject: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D""><b class=3D"">[IANA #1054018] =
Early allocation request for draft-ietf-idr-eag-distribution</b><br =
class=3D""></span></div><div style=3D"margin-top: 0px; margin-right: =
0px; margin-bottom: 0px; margin-left: 0px;" class=3D""><span =
style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Date: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D"">April 9, 2018 at 5:10:18 PM =
EDT<br class=3D""></span></div><div style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=3D""><span=
 style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Cc: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D"">&lt;<a =
href=3D"mailto:jgs@juniper.net" class=3D"">jgs@juniper.net</a>&gt;, =
&lt;<a href=3D"mailto:aretana.ietf@gmail.com" =
class=3D"">aretana.ietf@gmail.com</a>&gt;, &lt;<a =
href=3D"mailto:idr-chairs@ietf.org" =
class=3D"">idr-chairs@ietf.org</a>&gt;<br class=3D""></span></div><div =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px;" class=3D""><span style=3D"font-family: =
-webkit-system-font, Helvetica Neue, Helvetica, sans-serif; =
color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Reply-To: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D"">&lt;<a =
href=3D"mailto:iana-prot-param@iana.org" =
class=3D"">iana-prot-param@iana.org</a>&gt;<br class=3D""></span></div><br=
 class=3D""><div class=3D""><span style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: =
inline !important;" class=3D"">Hi all,<span =
class=3D"Apple-converted-space">&nbsp;</span></span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><br=
 style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">We've made the following early allocation in the =
BGP-LS Node Descriptor, Link Descriptor, Prefix Descriptor, and =
Attribute TLVs registry, in accordance with RFC 7120:<span =
class=3D"Apple-converted-space">&nbsp;</span></span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><br=
 style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">1173</span><span class=3D"Apple-tab-span" =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
pre; word-spacing: 0px; -webkit-text-stroke-width: 0px;">	=
</span><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">Extended Administrative Group (TEMPORARY - =
registered 2018-04-09, expires 2019-04-09)</span><span =
class=3D"Apple-tab-span" style=3D"font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: pre; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;">	</span><span style=3D"font-family:=
 Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: =
inline !important;" class=3D"">22/14</span><span class=3D"Apple-tab-span" =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
pre; word-spacing: 0px; -webkit-text-stroke-width: 0px;">	=
</span><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" =
class=3D"">[draft-ietf-idr-eag-distribution][RFC7308]</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><br=
 style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">When the IESG notifies us that they've approved =
the document for publication, we'll update the reference and remove the =
"temporary" note. If the document hasn't been approved within roughly 60 =
days of the expiration date, we'll ask you whether you want to renew the =
allocation for one more year. A renewal for a third year would require =
approval from the IESG.</span><br style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">Best regards,<span =
class=3D"Apple-converted-space">&nbsp;</span></span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><br=
 style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">Sabrina Tanamal</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">Senior IANA Services =
Specialist<span class=3D"Apple-converted-space">&nbsp;</span></span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""></div></blockquote></div><br class=3D""></body></html>=

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From nobody Tue Apr 10 01:16:14 2018
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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: "'Ketan Talaulikar \(ketant\)'" <ketant@cisco.com>
Cc: "'Jeffrey Haas'" <jhaas@pfrc.org>, <lsr@ietf.org>, <idr@ietf.org>
References: <008101d3ca60$073f81b0$15be8510$@org.cn> <c5a4d1de5e7943318821018c138b5562@XCH-ALN-008.cisco.com> <1B346347-9242-4EE4-BDA2-F024EF483B8A@tsinghua.org.cn> <aab65c5b06d346d2a5a4ef8cef5ad28b@XCH-ALN-008.cisco.com> <8C26288C-54C3-4C04-91A6-2B99562A1DE9@cisco.com> <5AC32E8B.6090202@cisco.com> <CF9450C5-028B-4B29-9F3A-137254AFF320@previdi.net> <009b01d3cbbb$6bfc3510$43f49f30$@org.cn> <bb5ff9928fb245739ae5480b884f1edd@XCH-ALN-008.cisco.com> <018c01d3ced9$6416b070$2c441150$@org.cn> <abd20a0336c3417abad64569658fe99e@XCH-ALN-008.cisco.com>
In-Reply-To: <abd20a0336c3417abad64569658fe99e@XCH-ALN-008.cisco.com>
Date: Tue, 10 Apr 2018 16:15:57 +0800
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Hi, Ketan:

=20

I read through the section that you provided at =
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-ext-04#=
section-3, and think 3/4 parts of them are unnecessary because the =
contents of 3.1,3.2 and 3.3 has been mentioned at the corresponding TLV =
definition parts. Only 3.4 part is necessary because it mentions the =
composite usage of two TLVs and can=E2=80=99t fit in any previous TLV =
definition.

=20

My suggestion is that we add some clarification under the error-prone =
TLV definition respectively, to let the vendor refer them clearly when =
implementing the BGP-LS protocol.=20

=20

ISIS/OSPF/OSPFv3/BGP-LS are different protocols in mainly the mechanism =
to transfer/digest the message, not the extensible TLVs definition, =
especially for the same purpose TLVs. There are some reasons that need =
to keep the definition compact/different, but beyond that, we should =
align them as same as possible to eliminate the error arose from =
inter-operation activities among different vendor or between device =
vendor and the SDN controller.

=20

=20

Best Regards.

=20

Aijun Wang

Network R&D and Operation Support Department

China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: Ketan Talaulikar (ketant) =
[mailto:ketant@cisco.com]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B44=E6=9C=889=E6=97=A5 =
16:45
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang
=E6=8A=84=E9=80=81: 'Jeffrey Haas'; lsr@ietf.org; idr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] Inconsistence regarding the definition of =
"Adj-SID Sub-TLV" between OSPF and ISIS extension for Segment Routing

=20

Hi Aijun,

=20

As responded previously and also clarified by few others, the 3 IGP =
protocols (ISIS, OSPFv2 and OSPFv3) and BGP-LS are different protocols. =
Their encodings need not be identical. However, their semantics =
generally are so when it comes mapping them into BGP-LS.

=20

At this stage, given the advance state of implementations and =
deployments for all these IGP and BGP-LS drafts involved, I =
don=E2=80=99t think we can undertake such =E2=80=9Ccosmetic=E2=80=9D =
changes.

=20

However, the draft-ietf-idr-bgp-ls-segment-routing-ext-04 is in WGLC and =
I can definitely take your feedback for any updates in the text or =
clarifications necessary in this document. Note that the procedures for =
the TLVs where mappings were non-trivial are described in the Procedures =
section - =
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-ext-04#=
section-3 . The TLVs you mention below are very trivial and the mapping =
from IGPs to BGP-LS is straightforward so the authors believe the =
explanation in Section 2 where each TLV field is described is =
sufficient.=20

=20

In the end, I am not sure if any of this helps/addresses implementation =
defects (where the reserved field itself was skipped from the BGP-LS =
TLV) that you have identified in your deployment on the producer side.

=20

Thanks,

Ketan

=20

From: Aijun Wang <wangaijun@tsinghua.org.cn>=20
Sent: 08 April 2018 07:02
To: Ketan Talaulikar (ketant) <ketant@cisco.com>
Cc: 'Jeffrey Haas' <jhaas@pfrc.org>; lsr@ietf.org; idr@ietf.org
Subject: =E7=AD=94=E5=A4=8D: [Lsr] Inconsistence regarding the =
definition of "Adj-SID Sub-TLV" between OSPF and ISIS extension for =
Segment Routing

=20

Hi, Ketan:

=20

I think there is another reason that causes this semantic error-----that =
is there is many similarities for the definition of =E2=80=9CAdj-SID =
Sub-TLV=E2=80=9D for ISIS and OSPFv3 in the following draft:

https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-extens=
ions-11#section-6.1

https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-15=
#section-2.2.1

=20

but there is no any description in the relevant paragraph to  =
distinguish them in BGP-LS document.

https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-ext-04#=
section-2.2.1

=20

Ketan explained that =E2=80=9CISIS uses 1 byte for type/length and has =
LSP space constraints which you would notice in  the protocol encodings. =
OSPF doesn=E2=80=99t have the same challenge and you would notice how =
its TLVs tend to be aligned. BGP-LS is somewhat similar to OSPF from =
these size constraints perspective.=E2=80=9D But when I compared another =
TLV definition =E2=80=9CSRMS Preference TLV=E2=80=9D in randomly, I =
found the definition in BGP-LS is different from that both in ISIS and =
OSPFv3.(include the =E2=80=9Clength=E2=80=9D field and =
=E2=80=9Creserved=E2=80=9D field) I don=E2=80=99t know there are how =
many inconsistence among them and think this will induce other =
inconsistencies when the vendor implements the BGP-LS protocol.

=20

Can we align these definitions as consistence as possible among them? Or =
add clear distinguish statements for the different IGP protocol?

The consumer can add some detections for such kind semantic errors but =
the better is not to produce them.

=20

=20

Best Regards.

=20

Aijun Wang

Network R&D and Operation Support Department

China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.

=E5=8F=91=E4=BB=B6=E4=BA=BA: Ketan Talaulikar (ketant) =
[mailto:ketant@cisco.com]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B44=E6=9C=884=E6=97=A5 =
15:54
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang
=E6=8A=84=E9=80=81: Jeffrey Haas; lsr@ietf.org; idr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] Inconsistence regarding the definition of =
"Adj-SID Sub-TLV" between OSPF and ISIS extension for Segment Routing

=20

< including IDR WG where BGP-LS work is being done >

=20

Hi Aijun,

=20

As discussed offline, this is a bug in this particular implementation =
where it is not following the spec properly.

=20

This goes back to the discussion in the IDR WG about the semantic and =
syntactic validation for BGP-LS messages which Jeff had brought up. In =
this case, my understanding was that there was a semantic error in this =
TLV encoding? The consumer (application/BGP speaker) in this case should =
detect and ignore this update =E2=80=93 which is what was being done as =
well in this case?

=20

Thanks,

Ketan

=20

From: Aijun Wang <wangaijun@tsinghua.org.cn>=20
Sent: 04 April 2018 07:50
To: 'stefano previdi' <stefano@previdi.net>; Peter Psenak (ppsenak) =
<ppsenak@cisco.com>
Cc: lsr@ietf.org; Ketan Talaulikar (ketant) <ketant@cisco.com>; Acee =
Lindem (acee) <acee@cisco.com>
Subject: =E7=AD=94=E5=A4=8D: [Lsr] Inconsistence regarding the =
definition of "Adj-SID Sub-TLV" between OSPF and ISIS extension for =
Segment Routing

=20

Hi, All:

=20

We have found some inconsistencies for the implementation of BGP-LS =
protocol regarding this =E2=80=9CAdj-SID SubTLV =E2=80=9D, please see =
the following screenshot.

I think we should do some works for the related drafts to clarify this =
ambiguous/easy to be ignored definition.

=20



=20

=20

Best Regards.

=20

Aijun Wang

Network R&D and Operation Support Department

China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.

=20

-----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
=E5=8F=91=E4=BB=B6=E4=BA=BA: stefano previdi =
[mailto:stefano@previdi.net]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B44=E6=9C=883=E6=97=A5 =
15:39
=E6=94=B6=E4=BB=B6=E4=BA=BA: Peter Psenak
=E6=8A=84=E9=80=81: lsr@ietf.org; Ketan Talaulikar (ketant); Acee Lindem =
(acee); Aijun Wang
=E4=B8=BB=E9=A2=98: Re: [Lsr] Inconsistence regarding the definition of =
"Adj-SID Sub-TLV" between OSPF and ISIS extension for Segment Routing

=20

me too.=20

=20

If we want to align the encoding, we should probably better align the =
protocol name directly...

=20

s.

=20

=20

> On Apr 3, 2018, at 9:34 AM, Peter Psenak < <mailto:ppsenak@cisco.com> =
ppsenak@cisco.com> wrote:

>=20

> On 02/04/18 14:19 , Acee Lindem (acee) wrote:

>> Speaking as WG member:

>>=20

>> I couldn=E2=80=99t agree more with Ketan. No changes are required to =
these=20

>> documents.

>=20

> as a coauthor of the OSPF/OSPFv3 SR drafts, I fully agree.

>=20

> thanks,

> Peter

>=20

>>=20

>> Thanks,

>>=20

>> Acee

>>=20

>> *From: *Lsr < <mailto:lsr-bounces@ietf.org> lsr-bounces@ietf.org> on =
behalf of "Ketan Talaulikar=20

>> (ketant)" < <mailto:ketant@cisco.com> ketant@cisco.com>

>> *Date: *Monday, April 2, 2018 at 7:36 AM

>> *To: *Aijun Wang < <mailto:wangaijun@tsinghua.org.cn> =
wangaijun@tsinghua.org.cn>

>> *Cc: *" <mailto:lsr@ietf.org> lsr@ietf.org" < <mailto:lsr@ietf.org> =
lsr@ietf.org>

>> *Subject: *Re: [Lsr] Inconsistence regarding the definition of=20

>> "Adj-SID Sub-TLV" between OSPF and ISIS extension for Segment Routing

>>=20

>> Hi Aijun,

>>=20

>> I understand what you are referring to now, but these are not=20

>> inconsistencies. ISIS, OSPF and BGP-LS are 3 different protocols.=20

>> Their encodings may not all be the same. ISIS uses 1 byte for=20

>> type/length and has LSP space constraints which you would notice in=20

>> the protocol encodings. OSPF doesn=E2=80=99t have the same challenge =
and you=20

>> would notice how its TLVs tend to be aligned. BGP-LS is somewhat=20

>> similar to OSPF from these size constraints perspective.

>>=20

>> I do not see the implementation challenges in encoding from the two=20

>> IGPs into BGP-LS. It does not make sense to change any of the=20

>> protocol encodings that you ask for currently since implementations=20

>> have been shipping with them for many years.

>>=20

>> IMHO it is not necessary to put such constraints for what you call=20

>> =E2=80=9Cconsistency=E2=80=9D on these 3 protocol encodings in the =
future. However,=20

>> we do try to be consistent in semantics as much as possible.

>>=20

>> Thanks,

>>=20

>> Ketan

>>=20

>> *From:*Aijun Wang < <mailto:wangaijun@tsinghua.org.cn> =
wangaijun@tsinghua.org.cn>

>> *Sent:* 02 April 2018 16:52

>> *To:* Ketan Talaulikar (ketant) < <mailto:ketant@cisco.com> =
ketant@cisco.com>

>> *Cc:*  <mailto:lsr@ietf.org> lsr@ietf.org

>> *Subject:* Re: [Lsr] Inconsistence regarding the definition of=20

>> "Adj-SID Sub-TLV" between OSPF and ISIS extension for Segment Routing

>>=20

>> Hi, Ketan:

>>=20

>> There is one two-bytes =E2=80=9CReserved=E2=80=9D field in =
=E2=80=9CAdjacency Segment=20

>> Identifier=E2=80=9D TLV for OSPF extension, but this field =
doesn=E2=80=99t exist in=20

>> the corresponding TLV for ISIS extension. Every other fields are =
same.

>>=20

>> Corresponding definition in BGP-LS is similar with OSPF(not similar=20

>> with ISIS as I mentioned in previous mail). Then when the router=20

>> reports/redistributes the ISIS LSDB information to BGP protocol, the=20

>> router must add two bytes to the =E2=80=9Clength=E2=80=9D field and =
add/stuff the=20

>> =E2=80=9Creserved=E2=80=9D field; but for OSPF LSDB, the router need =
only copy the=20

>> corresponding fields according.

>>=20

>> We have found the error arises from this inconsistency from the real=20

>> router and think it is better to align this definition in different=20

>> IGP protocol.

>>=20

>> Update to ISIS related extensions draft may be easier.

>>=20

>> Aijun Wang

>>=20

>> China Telecom

>>=20

>>=20

>> =E5=9C=A8 =
2018=E5=B9=B44=E6=9C=882=E6=97=A5=EF=BC=8C18:26=EF=BC=8CKetan Talaulikar =
(ketant)=20

>> < <mailto:ketant@cisco.com%3cmailto:ketant@cisco.com> =
ketant@cisco.com<mailto:ketant@cisco.com>> =E5=86=99=E9=81=93=EF=BC=9A

>>=20

>>    Hi Aijun,

>>=20

>>    Can you clarify what you mean by =
=E2=80=9Cinconsistencies=E2=80=9D?

>>=20

>>    Also, you are referring the old version of OSPFv3 SR draft before =
it

>>    was aligned with the OSPFv2 SR draft. Please check

>>   =20

>>  =
<https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-ex> =
https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-ex

>> tensions-11#section-6.1

>>=20

>>    OSPF and ISIS are different protocols and there are some =
differences

>>    between them. I would not call them inconsistencies. BGP-LS spec

>>    refers to the individual IGP drafts for interpretation of flags. =
So

>>    please specifically point out what inconsistency you are referring =
to.

>>=20

>>    Thanks,

>>=20

>>    Ketan

>>=20

>>    *From:*Lsr < =
<mailto:lsr-bounces@ietf.org%3cmailto:lsr-bounces@ietf.org> =
lsr-bounces@ietf.org<mailto:lsr-bounces@ietf.org>> *On

>>    Behalf Of *Aijun Wang

>>    *Sent:* 02 April 2018 14:23

>>    *To:*  <mailto:lsr@ietf.org%3cmailto:lsr@ietf.org> =
lsr@ietf.org<mailto:lsr@ietf.org>

>>    *Subject:* [Lsr] Inconsistence regarding the definition of =
"Adj-SID

>>    Sub-TLV" between OSPF and ISIS extension for Segment Routing

>>=20

>>    Hi, All:

>>=20

>>    We found there were some inconsistences for the definition of

>>    =E2=80=9CAdjacency Segment Identifier=E2=80=9D between OSPF and =
ISIS extension for

>>    segment routing, please see the link below for comparison.

>>=20

>>   =20

>>  =
<https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extension> =
https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extension

>> s-15#section-2.2.1

>>=20

>>   =20

>>  =
<https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-ex> =
https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-ex

>> tensions-10#section-7.1

>>=20

>>    Here we want to know is there any reason for this inconsistence? =
We

>>    think this inconsistence can easily cause error for BGP-LS

>>    implementation for segment routing extension, as that defined in

>>     =
<https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-ext-04=
#section-2.2.1> =
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-ext-04#=
section-2.2.1,

>>    which is similar with ISIS extension for SR, but different from =
OSPF

>>    extension for SR.

>>=20

>>    Do we need to make them consistent? It seems change the definition

>>    in OSPF extension may be less influence for the existing related =
drafts.

>>=20

>>    Best Regards.

>>=20

>>    Aijun Wang

>>=20

>>    Network R&D and Operation Support Department

>>=20

>>    China Telecom Corporation Limited Beijing Research

>>    Institute,Beijing, China.

>>=20

>>    _______________________________________________

>>    Lsr mailing list

>>     <mailto:Lsr@ietf.org%3cmailto:Lsr@ietf.org> =
Lsr@ietf.org<mailto:Lsr@ietf.org>

>>     <https://www.ietf.org/mailman/listinfo/lsr> =
https://www.ietf.org/mailman/listinfo/lsr

>>=20

>>=20

>>=20

>> _______________________________________________

>> Lsr mailing list

>>  <mailto:Lsr@ietf.org> Lsr@ietf.org

>>  <https://www.ietf.org/mailman/listinfo/lsr> =
https://www.ietf.org/mailman/listinfo/lsr

>>=20

>=20

> _______________________________________________

> Lsr mailing list

>  <mailto:Lsr@ietf.org> Lsr@ietf.org

>  <https://www.ietf.org/mailman/listinfo/lsr> =
https://www.ietf.org/mailman/listinfo/lsr

=20

_______________________________________________

Lsr mailing list

 <mailto:Lsr@ietf.org> Lsr@ietf.org

 <https://www.ietf.org/mailman/listinfo/lsr> =
https://www.ietf.org/mailman/listinfo/lsr


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vlink=3Dpurple style=3D'text-justify-trim:punctuation'><div =
class=3DWordSection1><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'>Hi, Ketan:<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>I read =
through the section that you provided at </span><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><a =
href=3D"https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing=
-ext-04#section-3">https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segm=
ent-routing-ext-04#section-3</a></span><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>, and think 3/4 parts of them =
are unnecessary because the contents of 3.1,3.2 and 3.3 has been =
mentioned at the corresponding TLV definition parts. Only 3.4 part is =
necessary because it mentions the composite usage of two TLVs and =
can=E2=80=99t fit in any previous TLV =
definition.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>My suggestion is that we add =
some clarification under the error-prone TLV definition respectively, to =
let the vendor refer them clearly when implementing the BGP-LS protocol. =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>ISIS/OSPF/OSPFv3/BGP-LS are =
different protocols in mainly the mechanism to transfer/digest the =
message, not the extensible TLVs definition, especially for the same =
purpose TLVs. There are some reasons that need to keep the definition =
compact/different, but beyond that, we should align them as same as =
possible to eliminate the error arose from inter-operation activities =
among different vendor or between device vendor and the SDN =
controller.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'>Network R&amp;D and Operation Support =
Department<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'>China Telecom Corporation Limited Beijing =
Research Institute,Beijing, China.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E4=BB=
=B6=E4=BA=BA<span lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> Ketan =
Talaulikar (ketant) [mailto:ketant@cisco.com] <br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E9=80=
=81=E6=97=B6=E9=97=B4<span lang=3DEN-US>:</span></span></b><span =
lang=3DEN-US style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> =
2018</span><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4<span =
lang=3DEN-US>4</span>=E6=9C=88<span lang=3DEN-US>9</span>=E6=97=A5<span =
lang=3DEN-US> 16:45<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun =
Wang<br></span><b>=E6=8A=84=E9=80=81<span lang=3DEN-US>:</span></b><span =
lang=3DEN-US> 'Jeffrey Haas'; lsr@ietf.org; =
idr@ietf.org<br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [Lsr] Inconsistence =
regarding the definition of &quot;Adj-SID Sub-TLV&quot; between OSPF and =
ISIS extension for Segment =
Routing<o:p></o:p></span></span></p></div></div><p class=3DMsoNormal =
align=3Dleft style=3D'text-align:left'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-IN style=3D'font-size:11.0pt;color:#1F497D'>Hi =
Aijun,<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>As responded previously and =
also clarified by few others, the 3 IGP protocols (ISIS, OSPFv2 and =
OSPFv3) and BGP-LS are different protocols. Their encodings need not be =
identical. However, their semantics generally are so when it comes =
mapping them into BGP-LS.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>At this stage, given the =
advance state of implementations and deployments for all these IGP and =
BGP-LS drafts involved, I don=E2=80=99t think we can undertake such =
=E2=80=9Ccosmetic=E2=80=9D changes.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>However, the =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 is in WGLC and I can =
definitely take your feedback for any updates in the text or =
clarifications necessary in this document. Note that the procedures for =
the TLVs where mappings were non-trivial are described in the Procedures =
section - <a =
href=3D"https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing=
-ext-04#section-3">https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segm=
ent-routing-ext-04#section-3</a> . The TLVs you mention below are very =
trivial and the mapping from IGPs to BGP-LS is straightforward so the =
authors believe the explanation in Section 2 where each TLV field is =
described is sufficient. <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>In the end, I am not sure if =
any of this helps/addresses implementation defects (where the reserved =
field itself was skipped from the BGP-LS TLV) that you have identified =
in your deployment on the producer side.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>Thanks,<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>Ketan<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><div=
><div style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt =
0cm 0cm 0cm'><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><b><span lang=3DEN-US =
style=3D'font-size:11.0pt'>From:</span></b><span lang=3DEN-US =
style=3D'font-size:11.0pt'> Aijun Wang &lt;<a =
href=3D"mailto:wangaijun@tsinghua.org.cn">wangaijun@tsinghua.org.cn</a>&g=
t; <br><b>Sent:</b> 08 April 2018 07:02<br><b>To:</b> Ketan Talaulikar =
(ketant) &lt;<a =
href=3D"mailto:ketant@cisco.com">ketant@cisco.com</a>&gt;<br><b>Cc:</b> =
'Jeffrey Haas' &lt;<a =
href=3D"mailto:jhaas@pfrc.org">jhaas@pfrc.org</a>&gt;; <a =
href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a>; <a =
href=3D"mailto:idr@ietf.org">idr@ietf.org</a><br><b>Subject:</b> =
</span><span style=3D'font-size:11.0pt;font-family:"MS =
Gothic"'>=E7=AD=94=E5=A4=8D</span><span lang=3DEN-US =
style=3D'font-size:11.0pt'>: [Lsr] Inconsistence regarding the =
definition of &quot;Adj-SID Sub-TLV&quot; between OSPF and ISIS =
extension for Segment Routing<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal align=3Dleft style=3D'text-align:left'><span =
lang=3DEN-IN><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:#1F497D'>Hi, Ketan:<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>I think =
there is another reason that causes this semantic error-----that is =
there is many similarities for the definition of =E2=80=9CAdj-SID =
Sub-TLV=E2=80=9D for ISIS and OSPFv3 in the following =
draft:<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><a =
href=3D"https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routin=
g-extensions-11#section-6.1">https://tools.ietf.org/html/draft-ietf-ospf-=
ospfv3-segment-routing-extensions-11#section-6.1</a><o:p></o:p></span></p=
><p class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'><a =
href=3D"https://tools.ietf.org/html/draft-ietf-isis-segment-routing-exten=
sions-15#section-2.2.1">https://tools.ietf.org/html/draft-ietf-isis-segme=
nt-routing-extensions-15#section-2.2.1</a><o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>but there =
is no any description in the relevant paragraph to &nbsp;distinguish =
them in BGP-LS document.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:#1F497D'><a =
href=3D"https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing=
-ext-04#section-2.2.1">https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-=
segment-routing-ext-04#section-2.2.1</a><o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US style=3D'color:#1F497D'>Ketan =
explained that =E2=80=9C</span><span lang=3DEN-US>ISIS uses 1 byte for =
type/length and has LSP space constraints which you would notice in =
&nbsp;the protocol encodings. OSPF doesn</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=99</span><span lang=3DEN-US>t =
have the same challenge and you would notice how its TLVs tend to be =
aligned. BGP-LS is somewhat similar to OSPF from these size constraints =
perspective.<span style=3D'color:#1F497D'>=E2=80=9D But when I compared =
another TLV definition =E2=80=9CSRMS Preference TLV=E2=80=9D in =
randomly, I found the definition in BGP-LS is different from that both =
in ISIS and OSPFv3.(include the =E2=80=9Clength=E2=80=9D field and =
=E2=80=9Creserved=E2=80=9D field) I don=E2=80=99t know there are how =
many inconsistence among them and think this will induce other =
inconsistencies when the vendor implements the BGP-LS =
protocol.<o:p></o:p></span></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US style=3D'color:#1F497D'>Can we =
align these definitions as consistence as possible among them? Or add =
clear distinguish statements for the different IGP =
protocol?<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US style=3D'color:#1F497D'>The consumer can add some =
detections for such kind semantic errors but the better is not to =
produce them.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#1F497D'>Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'>Network R&amp;D and Operation Support =
Department<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'>China Telecom Corporation Limited Beijing =
Research Institute,Beijing, China.<o:p></o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E4=BB=
=B6=E4=BA=BA</span></b><b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>:</span></b><sp=
an lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> Ketan =
Talaulikar (ketant) [<a =
href=3D"mailto:ketant@cisco.com">mailto:ketant@cisco.com</a>] =
<br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E9=80=
=81=E6=97=B6=E9=97=B4</span></b><b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>:</span></b><sp=
an lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> =
2018</span><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4</span=
><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>4</span><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E6=9C=88</span=
><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>4</span><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E6=97=A5</span=
><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> =
15:54<br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E6=94=B6=E4=BB=
=B6=E4=BA=BA</span></b><b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>:</span></b><sp=
an lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> Aijun =
Wang<br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E6=8A=84=E9=80=
=81</span></b><b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>:</span></b><sp=
an lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> Jeffrey Haas; =
<a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a>; <a =
href=3D"mailto:idr@ietf.org">idr@ietf.org</a><br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E4=B8=BB=E9=A2=
=98</span></b><b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>:</span></b><sp=
an lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> Re: [Lsr] =
Inconsistence regarding the definition of &quot;Adj-SID Sub-TLV&quot; =
between OSPF and ISIS extension for Segment =
Routing<o:p></o:p></span></p></div></div><p class=3DMsoNormal =
align=3Dleft style=3D'text-align:left'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-IN style=3D'font-size:11.0pt;color:#1F497D'>&lt; including IDR =
WG where BGP-LS work is being done &gt;<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>Hi =
Aijun,<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>As discussed offline, this is a =
bug in this particular implementation where it is not following the spec =
properly.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>This goes back to the =
discussion in the IDR WG about the semantic and syntactic validation for =
BGP-LS messages which Jeff had brought up. In this case, my =
understanding was that there was a semantic error in this TLV encoding? =
The consumer (application/BGP speaker) in this case should detect and =
ignore this update =E2=80=93 which is what was being done as well in =
this case?<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>Thanks,<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'>Ketan<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-IN =
style=3D'font-size:11.0pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><div=
><div style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt =
0cm 0cm 0cm'><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><b><span lang=3DEN-US =
style=3D'font-size:11.0pt'>From:</span></b><span lang=3DEN-US =
style=3D'font-size:11.0pt'> Aijun Wang &lt;<a =
href=3D"mailto:wangaijun@tsinghua.org.cn">wangaijun@tsinghua.org.cn</a>&g=
t; <br><b>Sent:</b> 04 April 2018 07:50<br><b>To:</b> 'stefano previdi' =
&lt;<a href=3D"mailto:stefano@previdi.net">stefano@previdi.net</a>&gt;; =
Peter Psenak (ppsenak) &lt;<a =
href=3D"mailto:ppsenak@cisco.com">ppsenak@cisco.com</a>&gt;<br><b>Cc:</b>=
 <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a>; Ketan Talaulikar =
(ketant) &lt;<a =
href=3D"mailto:ketant@cisco.com">ketant@cisco.com</a>&gt;; Acee Lindem =
(acee) &lt;<a =
href=3D"mailto:acee@cisco.com">acee@cisco.com</a>&gt;<br><b>Subject:</b> =
</span><span style=3D'font-size:11.0pt;font-family:"MS =
Gothic"'>=E7=AD=94=E5=A4=8D</span><span lang=3DEN-US =
style=3D'font-size:11.0pt'>: [Lsr] Inconsistence regarding the =
definition of &quot;Adj-SID Sub-TLV&quot; between OSPF and ISIS =
extension for Segment Routing<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal align=3Dleft style=3D'text-align:left'><span =
lang=3DEN-IN><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>Hi, All:<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>We have found some inconsistencies for the implementation =
of BGP-LS protocol regarding this </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9C</span><span =
lang=3DEN-US>Adj-SID SubTLV </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span lang=3DEN-US>, =
please see the following screenshot.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>I think we should do some works =
for the related drafts to clarify this ambiguous/easy to be ignored =
definition.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><img border=3D0 width=3D818 height=3D316 =
id=3D"_x0000_i1025" =
src=3D"cid:image001.png@01D3D0E4.CE2C5890"><o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Aijun Wang<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Network R&amp;D and Operation Support =
Department<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>China Telecom Corporation Limited Beijing Research =
Institute,Beijing, China.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>-----</span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=
=B6</span><span lang=3DEN-US>-----<br></span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E4=BB=B6=E4=BA=BA</spa=
n><span lang=3DEN-US>: stefano previdi [<a =
href=3D"mailto:stefano@previdi.net">mailto:stefano@previdi.net</a>] =
<br></span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=
=B4</span><span lang=3DEN-US>: 2018</span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4</span><span =
lang=3DEN-US>4</span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E6=9C=88</span><span =
lang=3DEN-US>3</span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E6=97=A5</span><span =
lang=3DEN-US> 15:39<br></span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E6=94=B6=E4=BB=B6=E4=BA=BA</spa=
n><span lang=3DEN-US>: Peter Psenak<br></span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E6=8A=84=E9=80=81</span><span =
lang=3DEN-US>: <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a>; Ketan =
Talaulikar (ketant); Acee Lindem (acee); Aijun Wang<br></span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E4=B8=BB=E9=A2=98</span><span =
lang=3DEN-US>: Re: [Lsr] Inconsistence regarding the definition of =
&quot;Adj-SID Sub-TLV&quot; between OSPF and ISIS extension for Segment =
Routing<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>me too. <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>If we want to align the encoding, we should probably better =
align the protocol name directly...<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>s.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; On Apr 3, 2018, at 9:34 AM, =
Peter Psenak &lt;<a href=3D"mailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>ppsenak@cisco.com</span><=
/a>&gt; wrote:<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; On 02/04/18 14:19 , Acee Lindem (acee) =
wrote:<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Speaking as WG member:<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; I couldn</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=99</span><span lang=3DEN-US>t =
agree more with Ketan. No changes are required to these =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; documents.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; as a coauthor of the =
OSPF/OSPFv3 SR drafts, I fully agree.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; =
thanks,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; Peter<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Thanks,<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Acee<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; *From: *Lsr &lt;<a =
href=3D"mailto:lsr-bounces@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr-bounces@ietf.org</spa=
n></a>&gt; on behalf of &quot;Ketan Talaulikar <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; (ketant)&quot; &lt;<a =
href=3D"mailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>ketant@cisco.com</span></=
a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; *Date: *Monday, April 2, 2018 at 7:36 =
AM<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; *To: *Aijun Wang &lt;<a =
href=3D"mailto:wangaijun@tsinghua.org.cn"><span =
style=3D'color:windowtext;text-decoration:none'>wangaijun@tsinghua.org.cn=
</span></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; *Cc: *&quot;<a href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr@ietf.org</span></a>&q=
uot; &lt;<a href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr@ietf.org</span></a>&g=
t;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; *Subject: *Re: [Lsr] Inconsistence regarding the =
definition of <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; &quot;Adj-SID Sub-TLV&quot; between OSPF and ISIS =
extension for Segment Routing<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Hi Aijun,<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; I understand what you are referring to now, but =
these are not <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; inconsistencies. ISIS, OSPF and BGP-LS are 3 =
different protocols. <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Their encodings may not all be the same. ISIS uses =
1 byte for <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; type/length and has LSP space constraints which =
you would notice in <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; the protocol encodings. OSPF doesn</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>=E2=80=99</span><span =
lang=3DEN-US>t have the same challenge and you <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; would notice how its =
TLVs tend to be aligned. BGP-LS is somewhat <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; similar to OSPF from =
these size constraints perspective.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; I do not see the implementation challenges in =
encoding from the two <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; IGPs into BGP-LS. It =
does not make sense to change any of the <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; protocol encodings that =
you ask for currently since implementations <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; have been shipping with =
them for many years.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; IMHO it is not =
necessary to put such constraints for what you call =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9C</span><span =
lang=3DEN-US>consistency</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span lang=3DEN-US> =
on these 3 protocol encodings in the future. However, =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; we do try to be consistent in semantics as much as =
possible.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
Thanks,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
Ketan<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; *From:*Aijun Wang =
&lt;<a href=3D"mailto:wangaijun@tsinghua.org.cn"><span =
style=3D'color:windowtext;text-decoration:none'>wangaijun@tsinghua.org.cn=
</span></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; *Sent:* 02 April 2018 =
16:52<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; *To:* Ketan Talaulikar (ketant) &lt;<a =
href=3D"mailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>ketant@cisco.com</span></=
a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; *Cc:* <a href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr@ietf.org</span></a><o=
:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
*Subject:* Re: [Lsr] Inconsistence regarding the definition of =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; &quot;Adj-SID Sub-TLV&quot; between OSPF and ISIS =
extension for Segment Routing<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Hi, Ketan:<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; There is one two-bytes </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9C</span><span =
lang=3DEN-US>Reserved</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span lang=3DEN-US> =
field in </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>=E2=80=9C</span><span lang=3DEN-US>Adjacency Segment =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Identifier</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span lang=3DEN-US> =
TLV for OSPF extension, but this field doesn</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=99</span><span lang=3DEN-US>t =
exist in <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; the corresponding TLV for ISIS extension. Every =
other fields are same.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Corresponding definition in BGP-LS is similar with =
OSPF(not similar <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; with ISIS as I mentioned in previous mail). Then =
when the router <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; reports/redistributes the ISIS LSDB information to =
BGP protocol, the <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; router must add two bytes to the </span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>=E2=80=9C</span><span =
lang=3DEN-US>length</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span lang=3DEN-US> =
field and add/stuff the <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; </span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>=E2=80=9C</span><span =
lang=3DEN-US>reserved</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span lang=3DEN-US> =
field; but for OSPF LSDB, the router need only copy the =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; corresponding fields =
according.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; We have found the error =
arises from this inconsistency from the real <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; router and think it is =
better to align this definition in different <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; IGP =
protocol.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; Update to ISIS related =
extensions draft may be easier.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; Aijun Wang<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; China Telecom<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; </span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E5=9C=A8</span><span =
lang=3DEN-US> 2018</span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4</span><span =
lang=3DEN-US>4</span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E6=9C=88</span><span =
lang=3DEN-US>2</span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E6=97=A5=EF=BC=8C</span><span =
lang=3DEN-US>18:26</span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=EF=BC=8C</span><span =
lang=3DEN-US>Ketan Talaulikar (ketant) <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; &lt;<a =
href=3D"mailto:ketant@cisco.com%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>ketant@cisco.com&lt;mailt=
o:ketant@cisco.com</span></a>&gt;&gt; </span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E5=86=99=E9=81=93=EF=BC=9A</spa=
n><span lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Hi =
Aijun,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Can =
you clarify what you mean by </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9C</span><span =
lang=3DEN-US>inconsistencies</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span =
lang=3DEN-US>?<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Also, =
you are referring the old version of OSPFv3 SR draft before =
it<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; was aligned with the OSPFv2 SR =
draft. Please check<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; <a =
href=3D"https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routin=
g-ex"><span =
style=3D'color:windowtext;text-decoration:none'>https://tools.ietf.org/ht=
ml/draft-ietf-ospf-ospfv3-segment-routing-ex</span></a><o:p></o:p></span>=
</p><p class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
tensions-11#section-6.1<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; OSPF and ISIS are different =
protocols and there are some differences<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
between them. I would not call them inconsistencies. BGP-LS =
spec<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; refers to the individual IGP =
drafts for interpretation of flags. So<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
please specifically point out what inconsistency you are referring =
to.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
Thanks,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
Ketan<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
*From:*Lsr &lt;<a =
href=3D"mailto:lsr-bounces@ietf.org%3cmailto:lsr-bounces@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr-bounces@ietf.org&lt;m=
ailto:lsr-bounces@ietf.org</span></a>&gt;&gt; =
*On<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Behalf Of *Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; *Sent:* 02 April 2018 =
14:23<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; *To:* <a =
href=3D"mailto:lsr@ietf.org%3cmailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr@ietf.org&lt;mailto:ls=
r@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
*Subject:* [Lsr] Inconsistence regarding the definition of =
&quot;Adj-SID<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Sub-TLV&quot; between OSPF and =
ISIS extension for Segment Routing<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Hi, All:<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; We found there were some =
inconsistences for the definition of<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>=E2=80=9C</span><span lang=3DEN-US>Adjacency Segment =
Identifier</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>=E2=80=9D</span><span lang=3DEN-US> between OSPF and ISIS =
extension for<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; segment routing, please see the =
link below for comparison.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; <a =
href=3D"https://tools.ietf.org/html/draft-ietf-isis-segment-routing-exten=
sion"><span =
style=3D'color:windowtext;text-decoration:none'>https://tools.ietf.org/ht=
ml/draft-ietf-isis-segment-routing-extension</span></a><o:p></o:p></span>=
</p><p class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
s-15#section-2.2.1<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <a =
href=3D"https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routin=
g-ex"><span =
style=3D'color:windowtext;text-decoration:none'>https://tools.ietf.org/ht=
ml/draft-ietf-ospf-ospfv3-segment-routing-ex</span></a><o:p></o:p></span>=
</p><p class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
tensions-10#section-7.1<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Here we want to know is there =
any reason for this inconsistence? We<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; think =
this inconsistence can easily cause error for =
BGP-LS<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; implementation for segment =
routing extension, as that defined in<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; <a =
href=3D"https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing=
-ext-04#section-2.2.1"><span =
style=3D'color:windowtext;text-decoration:none'>https://tools.ietf.org/ht=
ml/draft-ietf-idr-bgp-ls-segment-routing-ext-04#section-2.2.1</span></a>,=
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; which is similar with ISIS =
extension for SR, but different from OSPF<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
extension for SR.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Do we =
need to make them consistent? It seems change the =
definition<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; in OSPF extension may be less =
influence for the existing related drafts.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Best =
Regards.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
Network R&amp;D and Operation Support Department<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; China Telecom Corporation =
Limited Beijing Research<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
Institute,Beijing, China.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; =
_______________________________________________<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; Lsr =
mailing list<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; <a =
href=3D"mailto:Lsr@ietf.org%3cmailto:Lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>Lsr@ietf.org&lt;mailto:Ls=
r@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt;&nbsp;&nbsp;&nbsp; <a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr"><span =
style=3D'color:windowtext;text-decoration:none'>https://www.ietf.org/mail=
man/listinfo/lsr</span></a><o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; =
_______________________________________________<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; Lsr mailing =
list<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&gt; <a href=3D"mailto:Lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>Lsr@ietf.org</span></a><o=
:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr"><span =
style=3D'color:windowtext;text-decoration:none'>https://www.ietf.org/mail=
man/listinfo/lsr</span></a><o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
_______________________________________________<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; Lsr mailing =
list<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <a href=3D"mailto:Lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>Lsr@ietf.org</span></a><o=
:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; <a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr"><span =
style=3D'color:windowtext;text-decoration:none'>https://www.ietf.org/mail=
man/listinfo/lsr</span></a><o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>_______________________________________________<o:p></o:p></=
span></p><p class=3DMsoPlainText><span lang=3DEN-US>Lsr mailing =
list<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US><a =
href=3D"mailto:Lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>Lsr@ietf.org</span></a><o=
:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US><a =
href=3D"https://www.ietf.org/mailman/listinfo/lsr"><span =
style=3D'color:windowtext;text-decoration:none'>https://www.ietf.org/mail=
man/listinfo/lsr</span></a><o:p></o:p></span></p></div></body></html>
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------=_NextPart_000_0084_01D3D0E7.35BA2210--



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From: <bruno.decraene@orange.com>
To: "John G. Scudder" <jgs@juniper.net>
CC: "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "draft-ietf-idr-bgp-gr-notification@ietf.org" <draft-ietf-idr-bgp-gr-notification@ietf.org>, "idr@ietf. org" <idr@ietf.org>, Alvaro Retana <aretana.ietf@gmail.com>
Thread-Topic: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
Thread-Index: AQHTzbolPVH0g7eUOkyqTNQwp1P0FaP5pJnQ
Date: Tue, 10 Apr 2018 08:52:24 +0000
Message-ID: <31660_1523350345_5ACC7B49_31660_129_1_53C29892C857584299CBF5D05346208A47A05A21@OPEXCLILM21.corporate.adroot.infra.ftgroup>
References: <CAMMESszAe0avmcX0X95uOwRu29cTvbx_t7ewBwU-Hig20SD9pg@mail.gmail.com> <03AE36E3-F18B-4F34-9A6C-242AA1CAB4EC@juniper.net> <25077_1523005047_5AC73677_25077_122_1_53C29892C857584299CBF5D05346208A47A006C8@OPEXCLILM21.corporate.adroot.infra.ftgroup> <3197C941-3EBD-4BE0-B733-9C72A6B3B5FA@juniper.net>
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Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Aijun Wang <wangaijun@tsinghua.org.cn>
CC: "'Jeffrey Haas'" <jhaas@pfrc.org>, "lsr@ietf.org" <lsr@ietf.org>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: [Lsr] Inconsistence regarding the definition of "Adj-SID Sub-TLV" between OSPF and ISIS extension for Segment Routing
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Date: Tue, 10 Apr 2018 09:51:56 +0000
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Subject: Re: [Idr] [Lsr] Inconsistence regarding the definition of "Adj-SID Sub-TLV" between OSPF and ISIS extension for Segment Routing
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Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-ext-05.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : BGP Link-State extensions for Segment Routing
        Authors         : Stefano Previdi
                          Ketan Talaulikar
                          Clarence Filsfils
                          Hannes Gredler
                          Mach(Guoyi) Chen
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-ext-05.txt
	Pages           : 27
	Date            : 2018-04-10

Abstract:
   Segment Routing (SR) allows for a flexible definition of end-to-end
   paths by encoding paths as sequences of topological sub-paths, called
   "segments".  These segments are advertised by routing protocols e.g.
   by the link state routing protocols (IS-IS, OSPFv2 and OSPFv3) within
   IGP topologies.

   This draft defines extensions to the BGP Link-state address-family in
   order to carry segment routing information via BGP.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-ext/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-ext-05
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing-ext-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-bgp-ls-segment-routing-ext-05


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

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


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Subject: Re: [Idr] WG LC for draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March 21)
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Hi John/All,

I've updated the 05 version of this draft which addresses Jeff's comment ab=
out the reserved field.

Thanks,
Ketan


The IETF datatracker status page for this draft is:

https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-ext/



There are also htmlized versions available at:

https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-ext-05

https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing=
-ext-05



A diff from the previous version is available at:

https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routing-e=
xt-05


From: Ketan Talaulikar (ketant)
Sent: 07 April 2018 15:07
To: 'John G. Scudder' <jgs@juniper.net>; draft-ietf-idr-bgp-ls-segment-rout=
ing-ext@ietf.org
Cc: Hares Susan <shares@ndzh.com>; idr wg <idr@ietf.org>; Jeffrey Haas <jha=
as@pfrc.org>
Subject: RE: [Idr] WG LC for draft-ietf-idr-bgp-ls-segment-routing-ext-04 (=
March 7 to March 21)

Hi John,

I did respond and acknowledge the first point raised by Jeff below and I am=
 waiting to hear about any other comments before publishing that update. I =
will now publish this update early next week.

On the second point, I agree that the point raise should be addressed by a =
separate document that updates RFC7752 and I will get back to the WG on thi=
s.

With regards to the IPR call, as a co-author, I am not aware of any IPR for=
 this draft.

Thanks,
Ketan

From: John G. Scudder <jgs@juniper.net<mailto:jgs@juniper.net>>
Sent: 06 April 2018 23:47
To: draft-ietf-idr-bgp-ls-segment-routing-ext@ietf.org<mailto:draft-ietf-id=
r-bgp-ls-segment-routing-ext@ietf.org>
Cc: Hares Susan <shares@ndzh.com<mailto:shares@ndzh.com>>; idr wg <idr@ietf=
.org<mailto:idr@ietf.org>>; Jeffrey Haas <jhaas@pfrc.org<mailto:jhaas@pfrc.=
org>>
Subject: Re: [Idr] WG LC for draft-ietf-idr-bgp-ls-segment-routing-ext-04 (=
March 7 to March 21)

Hi Authors (and WG),

Jeff raised two points during the WGLC:

On Mar 15, 2018, at 7:07 PM, Jeffrey Haas <jhaas@pfrc.org<mailto:jhaas@pfrc=
.org>> wrote:

Minor comments as part of a re-read while waiting on my plane:
RESERVED is not called out in its behavior.  Some place in the document
should mention the usual "MUST be set to zero on send, SHOULD be ignored on
receipt".  Otherwise, it's gibberish in, who knows what out when someone
tries to use this field in the future.

I didn't see this one addressed. Authors, do you plan to update the draft t=
o address the point? I didn't see any other points raised during the WGLC t=
hat would require an update.

There are a number of TLV value fields that may be of variable lengths.  In
many cases, those lengths are inherited from the underlying IGP documents.
What is not documented is the behavior when the TLV is well formed but has
unexpected length values.  Two simple examples:
- Prefix Attribute Flag TLV; varies by IGP
- Preference TLV; must be 1.

Do we treat this as malformed?  Do we ignore the sub-tlv?

This point was discussed between Jeff and Ketan on the list. It seems to me=
 that it does bear further discussion, but that the issue doesn't need to b=
e fixed in this draft nor to be blocking on the conclusion of the WGLC. Ass=
uming the WG feels we should do better, the most obvious thing IMO would be=
 a document that updates RFC 7752.

Finally, authors and contributors, we forgot to ask for the usual IPR decla=
ration as part of the WGLC. If you could please take care of letting us kno=
w whether or not you are aware of any relevant IPR that has not been declar=
ed, that would help conclude the WGLC. (Right now there is no IPR declared,=
 https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&id=3Ddraft-ietf-id=
r-bgp-ls-segment-routing-ext)

Thanks,

--John

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</head>
<body lang=3D"EN-IN" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi John/Al=
l,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">I&#8217;ve=
 updated the 05 version of this draft which addresses Jeff&#8217;s comment =
about the reserved field.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">Thanks,<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">Ketan<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoPlainText">The IETF datatracker status page for this draft i=
s:<o:p></o:p></p>
<p class=3D"MsoPlainText"><a href=3D"https://datatracker.ietf.org/doc/draft=
-ietf-idr-bgp-ls-segment-routing-ext/">https://datatracker.ietf.org/doc/dra=
ft-ietf-idr-bgp-ls-segment-routing-ext/</a><o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">There are also htmlized versions available at:<o:=
p></o:p></p>
<p class=3D"MsoPlainText"><a href=3D"https://tools.ietf.org/html/draft-ietf=
-idr-bgp-ls-segment-routing-ext-05">https://tools.ietf.org/html/draft-ietf-=
idr-bgp-ls-segment-routing-ext-05</a><o:p></o:p></p>
<p class=3D"MsoPlainText"><a href=3D"https://datatracker.ietf.org/doc/html/=
draft-ietf-idr-bgp-ls-segment-routing-ext-05">https://datatracker.ietf.org/=
doc/html/draft-ietf-idr-bgp-ls-segment-routing-ext-05</a><o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">A diff from the previous version is available at:=
<o:p></o:p></p>
<p class=3D"MsoPlainText"><a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddr=
aft-ietf-idr-bgp-ls-segment-routing-ext-05">https://www.ietf.org/rfcdiff?ur=
l2=3Ddraft-ietf-idr-bgp-ls-segment-routing-ext-05</a><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">From:</span></b><span lang=3D"EN-=
US" style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> =
Ketan Talaulikar (ketant)
<br>
<b>Sent:</b> 07 April 2018 15:07<br>
<b>To:</b> 'John G. Scudder' &lt;jgs@juniper.net&gt;; draft-ietf-idr-bgp-ls=
-segment-routing-ext@ietf.org<br>
<b>Cc:</b> Hares Susan &lt;shares@ndzh.com&gt;; idr wg &lt;idr@ietf.org&gt;=
; Jeffrey Haas &lt;jhaas@pfrc.org&gt;<br>
<b>Subject:</b> RE: [Idr] WG LC for draft-ietf-idr-bgp-ls-segment-routing-e=
xt-04 (March 7 to March 21)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi John,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">I did resp=
ond and acknowledge the first point raised by Jeff below and I am waiting t=
o hear about any other comments before publishing
 that update. I will now publish this update early next week.<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">On the sec=
ond point, I agree that the point raise should be addressed by a separate d=
ocument that updates RFC7752 and I will get back
 to the WG on this.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">With regar=
ds to the IPR call, as a co-author, I am not aware of any IPR for this draf=
t.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">Thanks,<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">Ketan<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif">From:</span></b><span lang=3D"EN-=
US" style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> =
John G. Scudder &lt;<a href=3D"mailto:jgs@juniper.net">jgs@juniper.net</a>&=
gt;
<br>
<b>Sent:</b> 06 April 2018 23:47<br>
<b>To:</b> <a href=3D"mailto:draft-ietf-idr-bgp-ls-segment-routing-ext@ietf=
.org">draft-ietf-idr-bgp-ls-segment-routing-ext@ietf.org</a><br>
<b>Cc:</b> Hares Susan &lt;<a href=3D"mailto:shares@ndzh.com">shares@ndzh.c=
om</a>&gt;; idr wg &lt;<a href=3D"mailto:idr@ietf.org">idr@ietf.org</a>&gt;=
; Jeffrey Haas &lt;<a href=3D"mailto:jhaas@pfrc.org">jhaas@pfrc.org</a>&gt;=
<br>
<b>Subject:</b> Re: [Idr] WG LC for draft-ietf-idr-bgp-ls-segment-routing-e=
xt-04 (March 7 to March 21)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hi Authors (and WG),<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Jeff raised two points during the WGLC:<o:p></o:p></=
p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal">On Mar 15, 2018, at 7:07 PM, Jeffrey Haas &lt;<a hre=
f=3D"mailto:jhaas@pfrc.org">jhaas@pfrc.org</a>&gt; wrote:<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:9.0pt;font-family:&quot;Hel=
vetica&quot;,sans-serif">Minor comments as part of a re-read while waiting =
on my plane:<br>
RESERVED is not called out in its behavior. &nbsp;Some place in the documen=
t<br>
should mention the usual &quot;MUST be set to zero on send, SHOULD be ignor=
ed on<br>
receipt&quot;. &nbsp;Otherwise, it's gibberish in, who knows what out when =
someone<br>
tries to use this field in the future.</span><o:p></o:p></p>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">I didn't see this one addressed. Authors, do you pla=
n to update the draft to address the point? I didn't see any other points r=
aised during the WGLC that would require an update.<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><o:p>&nbsp;</o:p></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:9.0pt;font-family:&quot;Hel=
vetica&quot;,sans-serif">There are a number of TLV value fields that may be=
 of variable lengths. &nbsp;In<br>
many cases, those lengths are inherited from the underlying IGP documents.<=
br>
What is not documented is the behavior when the TLV is well formed but has<=
br>
unexpected length values. &nbsp;Two simple examples:<br>
- Prefix Attribute Flag TLV; varies by IGP<br>
- Preference TLV; must be 1.<br>
<br>
Do we treat this as malformed? &nbsp;Do we ignore the sub-tlv?</span><o:p><=
/o:p></p>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
<div>
<p class=3D"MsoNormal">This point was discussed between Jeff and Ketan on t=
he list. It seems to me that it does bear further discussion, but that the =
issue doesn't need to be fixed in this draft nor to be blocking on the conc=
lusion of the WGLC. Assuming the WG
 feels we should do better, the most obvious thing IMO would be a document =
that updates RFC 7752.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Finally, authors and contributors, we forgot to ask =
for the usual IPR declaration as part of the WGLC. If you could please take=
 care of letting us know whether or not you are aware of any relevant IPR t=
hat has not been declared, that would
 help conclude the WGLC. (Right now there is no IPR declared,&nbsp;<a href=
=3D"https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&amp;id=3Ddraft-=
ietf-idr-bgp-ls-segment-routing-ext">https://datatracker.ietf.org/ipr/searc=
h/?submit=3Ddraft&amp;id=3Ddraft-ietf-idr-bgp-ls-segment-routing-ext</a>)<o=
:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">--John<o:p></o:p></p>
</div>
</div>
</body>
</html>

--_000_b4f09c62498143f691f054659f678033XCHALN008ciscocom_--


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From: "Dongjie (Jimmy)" <jie.dong@huawei.com>
To: 'idr wg' <idr@ietf.org>
CC: "idr-chairs@ietf.org" <idr-chairs@ietf.org>
Thread-Topic: IETF101 IDR minutes uploaded
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Hi all,

The minutes of IETF 101 IDR session has been uploaded:

https://datatracker.ietf.org/meeting/101/materials/minutes-101-idr-01

Many thanks to Jeff Haas for taking notes on etherpad.

Please review it and let us know if any additions/corrections is needed. Th=
anks.

Best regards,
Jie

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<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi all, <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The minutes of IETF 101 IDR ses=
sion has been uploaded:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/meeting/101/materials/minutes-101-idr-01">https://datatracker.ietf=
.org/meeting/101/materials/minutes-101-idr-01</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Many thanks to Jeff Haas for ta=
king notes on etherpad.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Please review it and let us kno=
w if any additions/corrections is needed. Thanks.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Best regards,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Jie<o:p></o:p></span></p>
</div>
</body>
</html>

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From nobody Tue Apr 10 07:18:13 2018
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Date: Tue, 10 Apr 2018 10:18:52 -0400
From: Jeffrey Haas <jhaas@pfrc.org>
To: bruno.decraene@orange.com
Cc: "John G. Scudder" <jgs@juniper.net>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "idr@ietf. org" <idr@ietf.org>, "draft-ietf-idr-bgp-gr-notification@ietf.org" <draft-ietf-idr-bgp-gr-notification@ietf.org>
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Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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Bruno,

On Tue, Apr 10, 2018 at 08:52:24AM +0000, bruno.decraene@orange.com wrote:
> In case of Hard Reset “encapsulating” another notification, I had a comment about which Error (sub)Code is to be indicated to the network operator (e.g. in Yang, SNMP, Syslog…) I’m not seeing an answer nor clarification in the draft. (I’m not sure there is a good answer, but I’d prefer a consistent answer from all implementations)
> 

I'm not sure there's something to be consistently done here.

I believe your point is that if you receive a hard reset, you want to make
sure the underlying reason in the tunneled code/subcode is bubbled up the
management layer so you can see the WHY of it.  E.g. max prefix exceeded.
This is a good goal.  However, the implementation issues make trying to
provide normative behavior for this difficult.  

We provide no guidance for display of notifications in syslog in any BGP spec.

The RFC 4273 MIB doesn't provide any access to the notification DATA field.

The BGP MIBv2 work does provide a human readable text string where this
could go, but the contents of this field was intentionally not specified.

The IDR yang module (stale) doesn't have notifications in it.

The openconfig BGP module covers code/subcode, but not any human or machine
readable element for the DATA field.

My employer's implementation will grab the inner code/subcode and provide
that in the UI, but appears to lose the semantics that it was a hard reset.
(Sigh. Minor bug to file.)

The above mostly is intended to agree that there's valid management
considerations to be dealt with, but I don't see a good path forward.

-- Jeff


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To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
Cc: "John G. Scudder" <jgs@juniper.net>, "draft-ietf-idr-bgp-ls-segment-routing-ext@ietf.org" <draft-ietf-idr-bgp-ls-segment-routing-ext@ietf.org>,  Hares Susan <shares@ndzh.com>, idr wg <idr@ietf.org>
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Subject: Re: [Idr] WG LC for draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March 21)
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On Tue, Apr 10, 2018 at 09:56:48AM +0000, Ketan Talaulikar (ketant) wrote:
> Hi John/All,
> 
> I've updated the 05 version of this draft which addresses Jeff's comment about the reserved field.

This addresses my comment. Thanks.

--  Jeff


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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/jjb5y0NIrXAM80llJxvPWn1JAz0>
Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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(as co-author and WG member)

Hi Bruno,

Discussion in line below.

> On Apr 10, 2018, at 4:52 AM, bruno.decraene@orange.com wrote:
>=20
> Hi John,
> =20
> Thank you for the updated draft.
> In general -14 looks good to me, but I have 2 comments below, and more =
inline [Bruno] in your email.
> =20
> 1)
> In case of Hard Reset =E2=80=9Cencapsulating=E2=80=9D another =
notification, I had a comment about which Error (sub)Code is to be =
indicated to the network operator (e.g. in Yang, SNMP, Syslog=E2=80=A6) =
I=E2=80=99m not seeing an answer nor clarification in the draft. (I=E2=80=99=
m not sure there is a good answer, but I=E2=80=99d prefer a consistent =
answer from all implementations)

Part of my takeaway from the comments Jeff just sent is that there are =
limits on how much we can specify in this document since the various =
management layers that might be used have different semantics and =
constraints. How about something like this, as a new management =
considerations section?

"When reporting a hard reset to network management, the error code and =
subcode reported MUST be CEASE, Hard Reset. If the network management =
layer in use permits it, the information carried in the Data portion =
SHOULD be reported as well."=20

While it would be nice to tell the management layer that it has to =
report the encapsulated code and subcode in a useful, structured way, I =
can't see that as being in-scope for this document.
=20
> 2)=20
> Following the change introduced, I wish that the meaning of the N bit =
were slightly clarified: does it enable/disable the gr-notification =
capability for the subsequent/future event (=C3=A0 la BGP capability) or =
for the past one (=C3=A0 la GR "F" bit)? More below
> =20
> =C2=A72:
> "   If a BGP speaker which previously advertised the "N" bit opens a =
new
>    session without advertising that bit, normal BGP Graceful Restart
>    procedures documented in [RFC4724] apply."
>  =20
> FYI when first reading this new sentence, I have been wondering =
whether this was meant as aborting the gr-notification procedures =
underway (a la "F" bit). Then I tough probably not. If so may be =
:s/apply/will apply      (or apply from this Open till the next Open; or =
will apply for subsequent Notification). But really up to you.
> =20
> But then section 4.1 is changed with the addition of
> "The sentence "To deal with possible consecutive restarts, a route
>    (from the peer) previously marked as stale MUST be deleted" only
>    applies when the "N" bit has not been exchanged with the peer:"
>  =20
> Which may be understood as saying that not sending the N bit will =
result in aborting the gr-notification procedure.

These are good points and underscore the subtlety of the problem. You =
might recall that we introduced the new text and structure to deal with =
Alvaro's objection to the previous formulation, which said something to =
the effect of "if the N bit goes away, you shouldn't use that as a =
trigger to abort a GR in progress". As you point out, the GR capability =
has two functions -- to say what actions should be applied to routes =
from the previous session (or potentially previous sessionS in the case =
of this draft), and what actions should be applied at the termination of =
the current session. Trying to cover both of these in a way both clear =
and precise is proving challenging.

As a practical matter, I almost don't care about whether "a route (from =
the peer) previously marked as stale MUST be deleted" because the =
difference would only come into force if there were two or more resets =
in quick succession, *and* the final one removed the N bit. And even =
then, the difference in behaviors would necessarily be transient. So =
this is a very edgy edge case.=20

However, of course it's still desirable to be clear, which requires us =
to decide what exactly we want. It seems to me that a desirable way to =
spec and implement is that up until the GR capability has been =
exchanged, sans F bit, the previous F bit based semantics should apply, =
and after it has been exchanged, the new semantics should apply. What =
this comes down to is,

- Don't try to retrospectively go back and say "oh because the previous =
session was reset due to a holdtime expiration, and now I don't have the =
F bit, I'd better act as though it had been hard reset".=20
- Do apply the quoted text to any already-stale detritus of previous =
sessions.

Perhaps a sufficient clarifying change would be:

OLD:
   If a BGP speaker which previously advertised the "N" bit opens a new
   session without advertising that bit, normal BGP Graceful Restart
   procedures documented in [RFC4724] apply."

NEW:
   If a BGP speaker which previously advertised the "N" bit opens a new
   session without advertising that bit, normal BGP Graceful Restart
   procedures documented in [RFC4724] apply once the session has=20
   transitioned into ESTABLISHED state".

Unless there's objection or more discussion I'll update the draft =
accordingly.

> Especially given that =C2=A74 says
> "   When such a BGP speaker has received the "N" bit from its peer, =
and
>    receives from that peer a BGP NOTIFICATION message other than a =
Hard
>    Reset, it MUST follow the rules for the Receiving Speaker mentioned
>    in Section 4.1."
>  =20
> While section 4.1 only explicitly covers "detects termination of the =
TCP session for a BGP session" which may be understood as only TCP =
=E2=80=9Cissues=E2=80=9D and not the termination of the BGP session =
following the reception of a Notification.

Yes, as discussed above, creativity about this clause was largely what =
the text is trying to prevent.

> From: John G. Scudder [mailto:jgs@juniper.net =
<mailto:jgs@juniper.net>]=20
> Sent: Friday, April 06, 2018 5:16 PM
> To: DECRAENE Bruno IMT/OLN
> Cc: idr-chairs@ietf.org <mailto:idr-chairs@ietf.org>; =
draft-ietf-idr-bgp-gr-notification@ietf.org =
<mailto:draft-ietf-idr-bgp-gr-notification@ietf.org>; idr@ietf. org; =
Alvaro Retana
> Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
> =20
> Hi Bruno,
> =20
> I've just posted a -14 which I believe addresses all comments so far =
(yours and Alvaro's) other than this one, for which some discussion =
below.
> =20
> On Apr 6, 2018, at 4:57 AM, bruno.decraene@orange.com =
<mailto:bruno.decraene@orange.com> wrote:
> =20
> Hi John,
> =20
> Sorry to turn this thread into a general call for comment while the =
document is post WGLC=E2=80=A6
> =20
> Better now than when it gets to IETF Last Call.
> =20
> When:
> 1)     a BGP session is established (OPEN1)
> 2)     then GR or draft-ietf-idr-bgp-gr-notification triggers a new =
BGP open (OPEN2)
> 3)     this BGP OPEN2 triggers a Notification OPEN Message Error
> 4)     draft-ietf-idr-bgp-gr-notification is used to handle this =
Notification using GR
> =20
> It=E2=80=99s not crystal clear to me whether the BGP speakers should =
behave (in term of OPEN capability/parameters) as per OPEN1 or as per =
OPEN2.
> Indeed, OPEN2 is the latest but was erroneous and explicitly refused.
> Then again, the answer may be subcode specific=E2=80=A6 (with =
=E2=80=9CUnacceptable Hold Time=E2=80=9D it=E2=80=99s unlikely to accept =
the (Hold Time) parameter(s) from OPEN2).
> =20
> I think if the OPEN2 still exchanges the "N" bit it's already =
sufficiently specified, or maybe the point is moot.
> [Bruno] To be more specific, at step =E2=80=9C4=E2=80=9D, does the BGP =
speaker uses the GR parameters such as =E2=80=9CRestart Time=E2=80=9D, =
=E2=80=9CGR AFI/SAFI=E2=80=9D from OPEN1 or OPEN2? Same question for the =
=E2=80=9CForwarding State (F) =C2=BB bits. Same question for parameters =
in LLGR capability.
> =46rom your answer, you seem so say that the =E2=80=9CN=E2=80=9D bit =
from OPEN2 needs to be considered and taken into account.=20

That wasn't what I meant to say. Rather I meant that if OPEN1 carried =
the N bit and OPEN2 also carries the N bit, then it's immaterial whether =
we're considering the N bit status of OPEN1 or OPEN2 since they're the =
same anyway. But if pressed, I'd say the status of OPEN1 is the one that =
applies. Possibly the new text I propose above (that adds "once the =
session has transitioned into ESTABLISHED state" is sufficient?

> I=E2=80=99d like this to be clarified. =20
> =20
> OTOH if OPEN2 doesn't exchange the "N" bit (either because it removes =
the GR capability entirely or because it removes the bit) then maybe =
there is some clarification required. Unfortunately RFC 5492 doesn't =
seem to say when a capability is said to have been successfully =
exchanged, probably because at time of writing (or at least at time of =
writing the predecessor) the idea of keeping around previous-session =
state didn't exist.=20
> [Bruno] Exactly. That=E2=80=99s why I believe the burden to =
clarify/specify this falls on draft-ietf-idr-bgp-gr-notification
> =20
> Tentatively, my answer is to say "a capability is only considered to =
have been exchanged when the session carrying it transitions to =
ESTABLISHED state". In the situation under discussion, that wouldn't =
happen, so gr-notification type semantics would continue to remain in =
effect.
> [Bruno] Any answer works for me. I particularly like your proposition =
being clear and very general. However, it seems to say that the BGP =
capability advertised in OPEN2 should not be considered. While in your =
above answer, you seem to take it into consideration (=E2=80=9Cif the =
OPEN2 still exchanges the "N"=E2=80=9D)

I hope my comments above clarify this point.

[rest trimmed]

Regards,

--John=

--Apple-Mail=_7539B90B-35AE-445B-8028-71C080D8BC79
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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"">(as co-author and WG member)<div class=3D""><br =
class=3D""></div><div class=3D"">Hi Bruno,</div><div class=3D""><br =
class=3D""></div><div class=3D"">Discussion in line below.</div><div =
class=3D""><div class=3D""><br class=3D""><div class=3D""><div><blockquote=
 type=3D"cite" class=3D""><div class=3D"">On Apr 10, 2018, at 4:52 AM, =
<a href=3D"mailto:bruno.decraene@orange.com" =
class=3D"">bruno.decraene@orange.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-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;" class=3D"">Hi John,<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;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" 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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D"">Thank you for the =
updated 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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;" class=3D"">In general -14 looks good to =
me, but I have 2 comments below, and more inline [Bruno] in your =
email.<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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" 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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">1)<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D"">In case of Hard Reset =
=E2=80=9Cencapsulating=E2=80=9D another notification, I had a comment =
about which Error (sub)Code is to be indicated to the network operator =
(e.g. in Yang, SNMP, Syslog=E2=80=A6) I=E2=80=99m not seeing an answer =
nor clarification in the draft. (I=E2=80=99m not sure there is a good =
answer, but I=E2=80=99d prefer a consistent answer from all =
implementations)</span></div></div></div></blockquote><div><br =
class=3D""></div><div>Part of my takeaway from the comments Jeff just =
sent is that there are limits on how much we can specify in this =
document since the various management layers that might be used have =
different semantics and constraints. How about something like this, as a =
new management considerations section?</div><div><br =
class=3D""></div><div>"When reporting a hard reset to network =
management, the error code and subcode reported MUST be CEASE, Hard =
Reset. If the network&nbsp;management layer in use permits it, the =
information carried in the Data portion SHOULD be reported as =
well."&nbsp;</div><div><br class=3D""></div><div>While it would be nice =
to tell the management layer that it has to report the encapsulated code =
and subcode in a useful, structured way, I can't see that as being =
in-scope for this document.</div></div><div><span style=3D"font-family: =
Arial, sans-serif; font-size: 10pt;" class=3D"">&nbsp;</span><br =
class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;"><pre style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 10pt; font-family: 'Courier New';" =
class=3D""><span lang=3D"EN-US" style=3D"font-family: Arial, =
sans-serif;" class=3D"">2)</span><span lang=3D"EN-US" class=3D""> =
</span><o:p class=3D""></o:p></pre><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">Following the change introduced, I wish =
that the meaning of the N bit were slightly clarified: does it =
enable/disable the gr-notification capability for the subsequent/future =
event (=C3=A0 la BGP capability) or for the past one (=C3=A0 la GR "F" =
bit)? More below<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;" 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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">=C2=A72:<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;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">"&nbsp;&nbsp; If a BGP speaker which previously =
advertised the "N" bit opens a new<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D"">&nbsp;&nbsp; session =
without advertising that bit, normal BGP Graceful Restart<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;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">&nbsp;&nbsp; procedures documented in [RFC4724] =
apply."<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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">&nbsp;&nbsp;<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;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">FYI when first reading this new sentence, I have =
been wondering whether this was meant as aborting the gr-notification =
procedures underway (a la "F" bit). Then I tough probably not. If so may =
be :s/apply/will apply&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (or apply from this =
Open till the next Open; or will apply for subsequent Notification). But =
really up to you.<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;" 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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">But then section 4.1 is changed with the =
addition of<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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">"The sentence "To deal with possible =
consecutive restarts, a route<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D"">&nbsp;&nbsp; (from the =
peer) previously marked as stale MUST be deleted" only<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;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">&nbsp;&nbsp; applies when the "N" bit has not =
been exchanged with the peer:"<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D"">&nbsp;&nbsp;<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;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">Which may be understood as saying that not =
sending the N bit will result in aborting the gr-notification =
procedure.</span></div></div></blockquote><div><br =
class=3D""></div><div>These are good points and underscore the subtlety =
of the problem. You might recall that we introduced the new text and =
structure to deal with Alvaro's objection to the previous formulation, =
which said something to the effect of "if the N bit goes away, you =
shouldn't use that as a trigger to abort a GR in progress". As you point =
out, the GR capability has two functions -- to say what actions should =
be applied to routes from the previous session (or potentially previous =
sessionS in the case of this draft), and what actions should be applied =
at the termination of the current session. Trying to cover both of these =
in a way both clear and precise is proving challenging.</div><div><br =
class=3D""></div><div>As a practical matter, I almost don't care about =
whether "<span style=3D"font-family: Arial, sans-serif; font-size: =
10pt;" class=3D"">a route</span><span style=3D"font-family: Arial, =
sans-serif; font-size: 10pt;" class=3D"">&nbsp;(from the peer) =
previously marked as stale MUST be deleted" because the difference would =
only come into force if there were two or more resets in quick =
succession, *and* the final one removed the N bit. And even then, the =
difference in behaviors would necessarily be transient. So this is a =
very edgy edge case.&nbsp;</span></div><div><br =
class=3D""></div><div><span style=3D"font-family: Arial, sans-serif; =
font-size: 10pt;" class=3D"">However, of course it's still desirable to =
be clear, which requires us to decide what exactly we want. It seems to =
me that a desirable way to spec and implement is that up until the GR =
capability has been exchanged, sans F bit, the previous F bit based =
semantics should apply, and after it has been exchanged, the new =
semantics should apply. What this comes down to =
is,</span></div><div><span style=3D"font-family: Arial, sans-serif; =
font-size: 10pt;" class=3D""><br class=3D""></span></div><div><span =
style=3D"font-family: Arial, sans-serif; font-size: 10pt;" class=3D"">- =
Don't try to retrospectively go back and say "oh because the previous =
session was reset due to a holdtime expiration, and now I don't have the =
F bit, I'd better act as though it had been hard =
reset".&nbsp;</span></div><div><span style=3D"font-family: Arial, =
sans-serif; font-size: 10pt;" class=3D"">- Do apply the quoted text to =
any already-stale detritus of previous sessions.</span></div><div><br =
class=3D""></div><div><font face=3D"Arial, sans-serif" size=3D"2" =
class=3D"">Perhaps a sufficient clarifying change would =
be:</font></div><div><font face=3D"Arial, sans-serif" size=3D"2" =
class=3D""><br class=3D""></font></div><div><font face=3D"Arial, =
sans-serif" size=3D"2" class=3D"">OLD:</font></div><div><div =
class=3D"WordSection1" style=3D"page: WordSection1;"><div class=3D"" =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;"><span lang=3D"EN-US" class=3D"" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;">&nbsp; &nbsp;If a BGP speaker =
which previously advertised the "N" bit opens a new<o:p =
class=3D""></o:p></span></div><div class=3D"" style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;"><span =
lang=3D"EN-US" class=3D"" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;">&nbsp;&nbsp; session without advertising that bit, normal =
BGP Graceful Restart<o:p class=3D""></o:p></span></div><div class=3D"" =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;"><span lang=3D"EN-US" class=3D"" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;">&nbsp;&nbsp; procedures =
documented in [RFC4724] apply."<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1;"><div class=3D"" =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;"><span lang=3D"EN-US" class=3D"" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;"><br class=3D""></span></div><div =
class=3D"" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;"><span lang=3D"EN-US" class=3D"" =
style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;">NEW:</span></div><div class=3D"" style=3D"margin: 0cm 0cm =
0.0001pt;"><span lang=3D"EN-US" class=3D""><div class=3D"WordSection1" =
style=3D"page: WordSection1;"><div class=3D"" style=3D"font-family: =
'Times New Roman', serif; font-size: 12pt; margin: 0cm 0cm =
0.0001pt;"><span lang=3D"EN-US" class=3D"" style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;">&nbsp; &nbsp;If a BGP speaker which =
previously advertised the "N" bit opens a new<o:p =
class=3D""></o:p></span></div><div class=3D"" style=3D"font-family: =
'Times New Roman', serif; font-size: 12pt; margin: 0cm 0cm =
0.0001pt;"><span lang=3D"EN-US" class=3D"" style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;">&nbsp;&nbsp; session without =
advertising that bit, normal BGP Graceful Restart<o:p =
class=3D""></o:p></span></div><div class=3D"" style=3D"font-family: =
'Times New Roman', serif; font-size: 12pt; margin: 0cm 0cm =
0.0001pt;"><span lang=3D"EN-US" class=3D"" style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;">&nbsp;&nbsp; procedures documented in =
[RFC4724] apply once the session has&nbsp;<o:p =
class=3D""></o:p></span></div><div class=3D"" style=3D"font-family: =
'Times New Roman', serif; font-size: 12pt; margin: 0cm 0cm =
0.0001pt;"><span lang=3D"EN-US" class=3D"" style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;">&nbsp; &nbsp;transitioned into =
ESTABLISHED state".</span></div><div class=3D"" style=3D"font-family: =
'Times New Roman', serif; font-size: 12pt; margin: 0cm 0cm =
0.0001pt;"><span lang=3D"EN-US" class=3D"" style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;"><br class=3D""></span></div><div =
class=3D"" style=3D"font-family: 'Times New Roman', serif; font-size: =
12pt; margin: 0cm 0cm 0.0001pt;"><span lang=3D"EN-US" class=3D"" =
style=3D"font-size: 10pt; font-family: Arial, sans-serif;">Unless =
there's objection or more discussion I'll update the draft =
accordingly.</span></div><div class=3D"" style=3D"font-family: 'Times =
New Roman', serif; font-size: 12pt; margin: 0cm 0cm 0.0001pt;"><span =
lang=3D"EN-US" class=3D"" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;"><br =
class=3D""></span></div></div></span></div></div></div></div></div><div><b=
lockquote type=3D"cite" class=3D""><div class=3D"WordSection1" =
style=3D"page: WordSection1; font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;"><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-family: Arial, sans-serif; font-size: 10pt;" =
class=3D"">Especially given that =C2=A74 says</span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D"">"&nbsp;&nbsp; When =
such a BGP speaker has received the "N" bit from its peer, and<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;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">&nbsp;&nbsp; receives from that peer a BGP =
NOTIFICATION message other than a Hard<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;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">&nbsp;&nbsp; Reset, it MUST follow the rules for =
the Receiving Speaker mentioned<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D"">&nbsp;&nbsp; in =
Section 4.1."<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;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;" class=3D"">&nbsp;&nbsp;<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;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">While section 4.1 only explicitly covers =
"detects termination of the TCP session for a BGP session" which may be =
understood as only TCP =E2=80=9Cissues=E2=80=9D and not the termination =
of the BGP session following the reception of a =
Notification.</span></div></div></blockquote><div><br =
class=3D""></div>Yes, as discussed above, creativity about this clause =
was largely what the text is trying to prevent.</div><div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;" class=3D""><o:p =
class=3D""></o:p></span></div><div style=3D"border-style: none none none =
solid; border-left-width: 1.5pt; border-left-color: blue; padding: 0cm =
0cm 0cm 4pt;" class=3D""><div class=3D""><div style=3D"border-style: =
solid none none; border-top-width: 1pt; border-top-color: rgb(181, 196, =
223); padding: 3pt 0cm 0cm;" class=3D""><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><b class=3D""><span style=3D"font-size: 10pt; font-family: =
Tahoma, sans-serif;" class=3D"">From:</span></b><span style=3D"font-size: =
10pt; font-family: Tahoma, sans-serif;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>John G. Scudder [<a =
href=3D"mailto:jgs@juniper.net" style=3D"color: purple; text-decoration: =
underline;" class=3D"">mailto:jgs@juniper.net</a>]<span =
class=3D"Apple-converted-space">&nbsp;</span><br class=3D""><b =
class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Friday, April 06, 2018 5:16 =
PM<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>DECRAENE Bruno IMT/OLN<br =
class=3D""><b class=3D"">Cc:</b><span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:idr-chairs@ietf.org" style=3D"color: purple; =
text-decoration: underline;" class=3D"">idr-chairs@ietf.org</a>;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:draft-ietf-idr-bgp-gr-notification@ietf.org" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">draft-ietf-idr-bgp-gr-notification@ietf.org</a>; idr@ietf. =
org; Alvaro Retana<br class=3D""><b class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Re: [Idr] AD Review of =
draft-ietf-idr-bgp-gr-notification-13<o:p =
class=3D""></o:p></span></div></div></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Hi Bruno,<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">I've just posted a -14 which I believe addresses all =
comments so far (yours and Alvaro's) other than this one, for which some =
discussion below.<o:p class=3D""></o:p></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div =
class=3D""><blockquote style=3D"margin-top: 5pt; margin-bottom: 5pt;" =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D"">On =
Apr 6, 2018, at 4:57 AM,<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:bruno.decraene@orange.com" style=3D"color: purple; =
text-decoration: underline;" class=3D"">bruno.decraene@orange.com</a><span=
 class=3D"Apple-converted-space">&nbsp;</span>wrote:<o:p =
class=3D""></o:p></div></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;" class=3D"">Hi John,</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">&nbsp;</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">Sorry to turn this thread into a general =
call for comment while the document is post WGLC=E2=80=A6</span><o:p =
class=3D""></o:p></div></div></div></blockquote><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">Better now than when it gets to IETF Last Call.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">&nbsp;</span><o:p =
class=3D""></o:p></div></div><blockquote style=3D"margin-top: 5pt; =
margin-bottom: 5pt;" class=3D""><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; =
font-family: Arial, sans-serif;" class=3D"">When:</span><o:p =
class=3D""></o:p></div></div><div style=3D"margin-left: 36pt;" =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; text-indent: -18pt;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">1)</span><span lang=3D"EN-US" =
style=3D"font-size: 7pt;" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span></span><span lang=3D"EN-US" =
style=3D"font-size: 10pt; font-family: Arial, sans-serif;" class=3D"">a =
BGP session is established (OPEN1)</span><o:p =
class=3D""></o:p></div></div><div style=3D"margin-left: 36pt;" =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; text-indent: -18pt;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">2)</span><span lang=3D"EN-US" =
style=3D"font-size: 7pt;" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span></span><span lang=3D"EN-US" =
style=3D"font-size: 10pt; font-family: Arial, sans-serif;" class=3D"">then=
 GR or draft-ietf-idr-bgp-gr-notification triggers a new BGP open =
(OPEN2)</span><o:p class=3D""></o:p></div></div><div style=3D"margin-left:=
 36pt;" class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: =
12pt; font-family: 'Times New Roman', serif; text-indent: -18pt;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">3)</span><span lang=3D"EN-US" =
style=3D"font-size: 7pt;" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span></span><span lang=3D"EN-US" =
style=3D"font-size: 10pt; font-family: Arial, sans-serif;" class=3D"">this=
 BGP OPEN2 triggers a Notification OPEN Message Error</span><o:p =
class=3D""></o:p></div></div><div style=3D"margin-left: 36pt;" =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif; text-indent: -18pt;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">4)</span><span lang=3D"EN-US" =
style=3D"font-size: 7pt;" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span></span><span lang=3D"EN-US" =
style=3D"font-size: 10pt; font-family: Arial, sans-serif;" =
class=3D"">draft-ietf-idr-bgp-gr-notification is used to handle this =
Notification using GR</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 10pt; font-family: Arial, sans-serif;" =
class=3D"">&nbsp;</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 10pt; font-family: Arial, sans-serif;" =
class=3D"">It=E2=80=99s not crystal clear to me whether the BGP speakers =
should behave (in term of OPEN capability/parameters) as per OPEN1 or as =
per OPEN2.</span><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Arial, sans-serif;" class=3D"">Indeed, OPEN2 is the =
latest but was erroneous and explicitly refused.</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">Then again, the answer may be subcode =
specific=E2=80=A6 (with =E2=80=9CUnacceptable Hold Time=E2=80=9D it=E2=80=99=
s unlikely to accept the (Hold Time) parameter(s) from =
OPEN2).</span><o:p class=3D""></o:p></div></div></blockquote><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">I think if the OPEN2 still exchanges the "N" bit it's =
already sufficiently specified, or maybe the point is moot.<span =
style=3D"" class=3D""><o:p class=3D""></o:p></span></div><pre =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: =
'Courier New';" class=3D""><span lang=3D"EN-US" style=3D"font-family: =
Calibri, sans-serif;" class=3D"">[Bruno] To be more specific, at step =
=E2=80=9C4=E2=80=9D, does the BGP speaker uses the GR parameters such as =
=E2=80=9C</span><span lang=3D"EN-US" style=3D"font-family: Calibri, =
sans-serif;" class=3D"">Restart Time</span><span lang=3D"EN-US" =
style=3D"font-family: Calibri, sans-serif;" class=3D"">=E2=80=9D, =E2=80=9C=
GR AFI/SAFI=E2=80=9D from OPEN1 or OPEN2? Same question for the =
=E2=80=9C</span><span lang=3D"EN-US" style=3D"font-family: Calibri, =
sans-serif;" class=3D"">Forwarding State (F)&nbsp;=C2=BB </span><span =
lang=3D"EN-US" style=3D"font-family: Calibri, sans-serif;" =
class=3D"">bits. Same question for parameters in LLGR capability.<o:p =
class=3D""></o:p></span></pre><pre style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 10pt; font-family: 'Courier New';" class=3D""><span =
lang=3D"EN-US" style=3D"font-family: Calibri, sans-serif;" class=3D"">=46r=
om your answer, you seem so say that the =E2=80=9CN=E2=80=9D bit from =
OPEN2 needs to be considered and taken into account. =
</span></pre></div></div></div></div></div></blockquote><div><br =
class=3D""></div><div>That wasn't what I meant to say. Rather I meant =
that if OPEN1 carried the N bit and OPEN2 also carries the N bit, then =
it's immaterial whether we're considering the N bit status of OPEN1 or =
OPEN2 since they're the same anyway. But if pressed, I'd say the status =
of OPEN1 is the one that applies. Possibly the new text I propose above =
(that adds "once the session has transitioned into ESTABLISHED state" is =
sufficient?</div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div =
style=3D"border-style: none none none solid; border-left-width: 1.5pt; =
border-left-color: blue; padding: 0cm 0cm 0cm 4pt;" class=3D""><div =
class=3D""><div class=3D""><div class=3D""><pre style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 10pt; font-family: 'Courier New';" class=3D""><span =
lang=3D"EN-US" style=3D"font-family: Calibri, sans-serif;" =
class=3D"">I=E2=80=99d like this to be clarified. </span><span =
lang=3D"EN-US" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></pre></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">OTOH if OPEN2 doesn't exchange the "N" =
bit (either because it removes the GR capability entirely or because it =
removes the bit) then maybe there is some clarification required. =
Unfortunately RFC 5492 doesn't seem to say when a capability is said to =
have been successfully exchanged, probably because at time of writing =
(or at least at time of writing the predecessor) the idea of keeping =
around previous-session state didn't exist.&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Calibri, sans-serif;" class=3D"">[Bruno] Exactly. That=E2=80=99s why I =
believe the burden to clarify/specify this falls on =
draft-ietf-idr-bgp-gr-notification</span><span lang=3D"EN-US" style=3D"" =
class=3D""><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;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Tentatively, my answer is to say "a =
capability is only considered to have been exchanged when the session =
carrying it transitions to ESTABLISHED state". In the situation under =
discussion, that wouldn't happen, so gr-notification type semantics =
would continue to remain in effect.<o:p class=3D""></o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
10pt; font-family: Calibri, sans-serif;" class=3D"">[Bruno] Any answer =
works for me. I particularly like your proposition being clear and very =
general. However, it seems to say that the BGP capability advertised in =
OPEN2 should not be considered. While in your above answer, you seem to =
take it into consideration (=E2=80=9C</span><span lang=3D"EN-US" =
class=3D"">if the OPEN2 still exchanges the "N"</span><span lang=3D"EN-US"=
 style=3D"font-size: 10pt; font-family: Calibri, sans-serif;" =
class=3D"">=E2=80=9D)</span></div></div></div></div></div></div></blockquo=
te><div><br class=3D""></div>I hope my comments above clarify this =
point.</div><div><br class=3D""></div><div>[rest =
trimmed]</div></div></div><div><br =
class=3D""></div><div>Regards,</div><div><br =
class=3D""></div><div>--John</div></div></body></html>=

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From: <bruno.decraene@orange.com>
To: Jeffrey Haas <jhaas@pfrc.org>, "John G. Scudder" <jgs@juniper.net>
CC: "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "idr@ietf. org" <idr@ietf.org>, "draft-ietf-idr-bgp-gr-notification@ietf.org" <draft-ietf-idr-bgp-gr-notification@ietf.org>
Thread-Topic: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
Thread-Index: AQHT0NbZPVH0g7eUOkyqTNQwp1P0FaP6DeuA
Date: Tue, 10 Apr 2018 15:37:54 +0000
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References: <CAMMESszAe0avmcX0X95uOwRu29cTvbx_t7ewBwU-Hig20SD9pg@mail.gmail.com> <03AE36E3-F18B-4F34-9A6C-242AA1CAB4EC@juniper.net> <25077_1523005047_5AC73677_25077_122_1_53C29892C857584299CBF5D05346208A47A006C8@OPEXCLILM21.corporate.adroot.infra.ftgroup> <3197C941-3EBD-4BE0-B733-9C72A6B3B5FA@juniper.net> <31660_1523350345_5ACC7B49_31660_129_1_53C29892C857584299CBF5D05346208A47A05A21@OPEXCLILM21.corporate.adroot.infra.ftgroup> <20180410141851.GA24256@pfrc.org>
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From nobody Tue Apr 10 08:48:45 2018
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Date: Tue, 10 Apr 2018 11:49:25 -0400
From: Jeffrey Haas <jhaas@pfrc.org>
To: bruno.decraene@orange.com
Cc: "John G. Scudder" <jgs@juniper.net>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "idr@ietf. org" <idr@ietf.org>, "draft-ietf-idr-bgp-gr-notification@ietf.org" <draft-ietf-idr-bgp-gr-notification@ietf.org>
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Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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Bruno,

On Tue, Apr 10, 2018 at 03:37:54PM +0000, bruno.decraene@orange.com wrote:
> > From: Jeffrey Haas [mailto:jhaas@pfrc.org]  > Sent: Tuesday, April 10, 2018 4:19 PM
>  > The BGP MIBv2 work does provide a human readable text string where this
>  > could go, but the contents of this field was intentionally not specified.
> 
> So let's take the RFC 4273 MIB example.
> 
>         bgpPeerLastError OBJECT-TYPE
>             SYNTAX     OCTET STRING (SIZE (2))
>             MAX-ACCESS read-only
>             STATUS     current
>             DESCRIPTION
>                     "The last error code and subcode seen by this
>                      peer on this connection.
> 
> 
> My question is whether the "The last error code and subcode seen by this peer on this connection." is either:
> a) the one encoded in the BGP Notification fields i.e. always (Cease, Hard Reset) whatever the original reason is. i.e. gr-notification is now masking the true reason.
> b) the one encapsulated in the Data field, i.e. the original one/true reason/one which used to be advertised when gr-notification is not enabled
> 
> My reading of your email, is that "a" applies. This works for me.

Especially for implementations that do not implement this draft.  So, a
would be consistent even if less helpful.

> Eventually the problematic of masking the true reason could be mentioned in the draft. (e.g. in a Manageability Considerations section)

This may be the best thing to do.  

> IMHO, draft-ietf-idr-bgp-gr-notification indicating which is the preferred option (between "a" and "b") would be better than nothing.
> But I can certainly live with the current draft.

I think John's most recent suggestion covers most of the ground with regard
to suggested normative behavior.  If the implementation could display it, it
should.  I do worry slightly that this creates precedence for other similar
logging of DATA.

-- Jeff


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From: <bruno.decraene@orange.com>
To: "John G. Scudder" <jgs@juniper.net>
CC: "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "idr@ietf. org" <idr@ietf.org>, "draft-ietf-idr-bgp-gr-notification@ietf.org" <draft-ietf-idr-bgp-gr-notification@ietf.org>
Thread-Topic: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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Date: Tue, 10 Apr 2018 15:51:15 +0000
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From: <bruno.decraene@orange.com>
To: "John G. Scudder" <jgs@juniper.net>
CC: "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "idr@ietf. org" <idr@ietf.org>, "draft-ietf-idr-bgp-gr-notification@ietf.org" <draft-ietf-idr-bgp-gr-notification@ietf.org>
Thread-Topic: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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Date: Tue, 10 Apr 2018 16:12:10 +0000
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Subject: [Idr] I-D Action: draft-ietf-idr-bgp-gr-notification-15.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Notification Message support for BGP Graceful Restart
        Authors         : Keyur Patel
                          Rex Fernando
                          John Scudder
                          Jeff Haas
	Filename        : draft-ietf-idr-bgp-gr-notification-15.txt
	Pages           : 9
	Date            : 2018-04-10

Abstract:
   The BGP Graceful Restart mechanism defined in RFC 4724 limits the
   usage of BGP Graceful Restart to BGP protocol messages other than a
   BGP NOTIFICATION message.  This document updates RFC 4724 by defining
   an extension that permits the Graceful Restart procedures to be
   performed when the BGP speaker receives a BGP NOTIFICATION Message or
   the Hold Time expires.  This document also defines a new BGP
   NOTIFICATION Cease Error subcode whose effect is to request a full
   session restart instead of a Graceful Restart.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-gr-notification/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-gr-notification-15
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-gr-notification-15

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-bgp-gr-notification-15


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

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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/rYw7rT0WUHBNje4uLh_Ct0vquiM>
Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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On Apr 10, 2018, at 12:12 PM, bruno.decraene@orange.com wrote:
>=20
> Yet this text only applies to the =E2=80=9CN=E2=80=9D bit and does not =
specify the behavior for other GR parameters. e.g. change in Restart =
Time. May be the following text would cover all GR parameters:
> NEW2:
>    If a BGP speaker which previously advertised the "N" bit opens a =
new
>    session with different Graceful Restart parameters, these new =
parameters
>  apply once the session has=20
>    transitioned into ESTABLISHED state".

I adopted an even-more-general version of this:

   If a BGP speaker that previously advertised a given set of Graceful
   Restart parameters opens a new session with a different set of
   parameters, these new parameters apply once the session has
   transitioned into ESTABLISHED state.

I just posted -15 with this and the new Management Considerations =
section we discussed.

--John


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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"">On Apr 10, 2018, at 12:12 PM, <a =
href=3D"mailto:bruno.decraene@orange.com" =
class=3D"">bruno.decraene@orange.com</a> wrote:<br =
class=3D""><div><blockquote type=3D"cite" class=3D""><br =
class=3D"Apple-interchange-newline"><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 10pt; font-family: Arial, sans-serif;" class=3D"">Yet =
this text only applies to the =E2=80=9CN=E2=80=9D bit and does not =
specify the behavior for other GR parameters. e.g. change in Restart =
Time. May be the following text would cover all GR parameters:<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; font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">NEW2:</span><span lang=3D"EN-US" =
class=3D""><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; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 10pt; font-family: Arial, sans-serif;" =
class=3D"">&nbsp; &nbsp;If a BGP speaker which previously advertised the =
"N" bit opens a new</span><span lang=3D"EN-US" class=3D""><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt =
5.25pt; font-size: 12pt; font-family: 'Times New Roman', serif; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 10pt; font-family: Arial, sans-serif;" =
class=3D"">&nbsp;&nbsp; session with different Graceful Restart =
parameters, these new parameters<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; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 10pt; font-family: Arial, =
sans-serif;" class=3D"">&nbsp;apply once the session =
has&nbsp;</span><span lang=3D"EN-US" class=3D""><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; font-style: =
normal; font-variant-caps: normal; font-weight: normal; letter-spacing: =
normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 10pt; font-family: =
Arial, sans-serif;" class=3D"">&nbsp; &nbsp;transitioned into =
ESTABLISHED state".</span></div></div></blockquote><br =
class=3D""></div><div>I adopted an even-more-general version of =
this:</div><div><br class=3D""></div><div><div class=3D"">&nbsp; =
&nbsp;If a BGP speaker that previously advertised a given set of =
Graceful</div><div class=3D"">&nbsp; &nbsp;Restart parameters opens a =
new session with a different set of</div><div class=3D"">&nbsp; =
&nbsp;parameters, these new parameters apply once the session =
has</div><div class=3D"">&nbsp; &nbsp;transitioned into ESTABLISHED =
state.</div><br class=3D"Apple-interchange-newline">I just posted -15 =
with this and the new Management Considerations section we =
discussed.</div><div><br class=3D""></div><div>--John</div><br =
class=3D""></body></html>=

--Apple-Mail=_34E84EF0-0FD0-491A-8342-A19692F57F06--


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From: Alvaro Retana <aretana.ietf@gmail.com>
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References: <CAMMESszAe0avmcX0X95uOwRu29cTvbx_t7ewBwU-Hig20SD9pg@mail.gmail.com> <03AE36E3-F18B-4F34-9A6C-242AA1CAB4EC@juniper.net> <25077_1523005047_5AC73677_25077_122_1_53C29892C857584299CBF5D05346208A47A006C8@OPEXCLILM21.corporate.adroot.infra.ftgroup> <3197C941-3EBD-4BE0-B733-9C72A6B3B5FA@juniper.net> <31660_1523350345_5ACC7B49_31660_129_1_53C29892C857584299CBF5D05346208A47A05A21@OPEXCLILM21.corporate.adroot.infra.ftgroup> <0F24B194-DF39-490A-9826-458BBACA158D@juniper.net> <29869_1523376730_5ACCE25A_29869_292_1_53C29892C857584299CBF5D05346208A47A0690B@OPEXCLILM21.corporate.adroot.infra.ftgroup> <DDFC2A38-C5D9-44F3-8201-505B0918649F@juniper.net>
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To: "John G. Scudder" <jgs@juniper.net>,  "bruno.decraene@orange.com" <bruno.decraene@orange.com>
Cc: "idr-chairs@ietf.org" <idr-chairs@ietf.org>,  "draft-ietf-idr-bgp-gr-notification@ietf.org" <draft-ietf-idr-bgp-gr-notification@ietf.org>,  "idr@ietf. org" <idr@ietf.org>
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Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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On April 10, 2018 at 2:26:23 PM, John G. Scudder (jgs@juniper.net) wrote:

John:

Hi!

I just posted -15...

I looked at this new update.  Just a couple of comments:

C1. S5.1 sounds very hand-wavy: =E2=80=9C...guiding principle for the imple=
mentor
should be that if there is no realistic hope that forwarding can
continue=E2=80=A6=E2=80=9D.   I=E2=80=99m not a programmer, but I have no i=
dea how hope can be
coded in=E2=80=A6  I think that unless someone has a significant objection =
later on
(IETF LC, IESG), we can leave the text as is, given that it is correctly
qualified as suggestions=E2=80=A6 I don=E2=80=99t have a suggestion to make=
 the text
better, it may be the best we can do=E2=80=A6it just doesn=E2=80=99t give m=
e a warm fuzzy
feeling=E2=80=A6

C2. Even though S5.2. (Interaction With Other Specifications) qualifies
that it applies to =E2=80=9Cwhen [RFC8203] is used in conjunction with Hard=
 Reset=E2=80=9D,
I think that is the general case (not the exception), so I think that this
document Updates rfc8203 (and should be tagged as such).  Please make that
change on the next revision (you can wait to collect IETF LC comments).

I=E2=80=99m starting the IETF Last Call.

Thanks!

Alvaro.

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<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style>=
</head><body style=3D"word-wrap:break-word"><div id=3D"bloop_customfont" st=
yle=3D"font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);mar=
gin:0px;line-height:auto">On April 10, 2018 at 2:26:23 PM, John G. Scudder =
(<a href=3D"mailto:jgs@juniper.net">jgs@juniper.net</a>) wrote:</div><div i=
d=3D"bloop_customfont" style=3D"font-family:Helvetica,Arial;font-size:13px;=
color:rgba(0,0,0,1.0);margin:0px;line-height:auto"><br></div><div id=3D"blo=
op_customfont" style=3D"font-family:Helvetica,Arial;font-size:13px;color:rg=
ba(0,0,0,1.0);margin:0px;line-height:auto">John:</div><div id=3D"bloop_cust=
omfont" style=3D"font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,=
0,1.0);margin:0px;line-height:auto"><br></div><div id=3D"bloop_customfont" =
style=3D"font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);m=
argin:0px;line-height:auto">Hi!</div><div id=3D"bloop_customfont" style=3D"=
font-family:Helvetica,Arial;font-size:13px;color:rgba(0,0,0,1.0);margin:0px=
;line-height:auto"><br></div> <div><blockquote type=3D"cite" class=3D"clean=
_bq" style=3D"font-family:Helvetica,Arial;font-size:13px;font-style:normal;=
font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-alig=
n:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing=
:0px"><span><div><span style=3D"color:rgb(0,0,0);font-family:&#39;helvetica=
 Neue&#39;,helvetica;font-size:14px;font-style:normal;font-variant-caps:nor=
mal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0=
px;text-transform:none;white-space:normal;word-spacing:0px;background-color=
:rgb(255,255,255);float:none;display:inline!important">I just posted -15...=
</span></div></span></blockquote></div><p>I looked at this new update.=C2=
=A0 Just a couple of comments:</p><p>C1. S5.1 sounds very hand-wavy: =E2=80=
=9C...guiding principle for the implementor should be that if there is no=
=C2=A0realistic hope that forwarding can continue=E2=80=A6=E2=80=9D. =C2=A0=
 I=E2=80=99m not a programmer, but I have no idea how hope can be coded in=
=E2=80=A6 =C2=A0I think that unless someone has a significant objection lat=
er on (IETF LC, IESG), we can leave the text as is, given that it is correc=
tly qualified as suggestions=E2=80=A6 I don=E2=80=99t have a suggestion to =
make the text better, it may be the best we can do=E2=80=A6it just doesn=E2=
=80=99t give me a warm fuzzy feeling=E2=80=A6</p><p>C2. Even though S5.2. (=
Interaction With Other Specifications) qualifies that it applies to =E2=80=
=9Cwhen [RFC8203] is used in conjunction with Hard Reset=E2=80=9D, I think =
that is the general case (not the exception), so I think that this document=
 Updates rfc8203 (and should be tagged as such).=C2=A0 Please make that cha=
nge on the next revision (you can wait to collect IETF LC comments).</p><p>=
I=E2=80=99m starting the IETF Last Call.</p><p>Thanks!</p><p>Alvaro.</p><p>=
<br></p><div><br class=3D"Apple-interchange-newline"></div> <div id=3D"bloo=
p_sign_1523397866428306944" class=3D"bloop_sign"></div></body></html>

--000000000000d58ced056985fc38--


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Subject: [Idr] Last Call: <draft-ietf-idr-bgp-gr-notification-15.txt> (Notification Message support for BGP Graceful Restart) to Proposed Standard
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The IESG has received a request from the Inter-Domain Routing WG (idr) to
consider the following document: - 'Notification Message support for BGP
Graceful Restart'
  <draft-ietf-idr-bgp-gr-notification-15.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits final
comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2018-04-24. Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the beginning of
the Subject line to allow automated sorting.

Abstract


   The BGP Graceful Restart mechanism defined in RFC 4724 limits the
   usage of BGP Graceful Restart to BGP protocol messages other than a
   BGP NOTIFICATION message.  This document updates RFC 4724 by defining
   an extension that permits the Graceful Restart procedures to be
   performed when the BGP speaker receives a BGP NOTIFICATION Message or
   the Hold Time expires.  This document also defines a new BGP
   NOTIFICATION Cease Error subcode whose effect is to request a full
   session restart instead of a Graceful Restart.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-gr-notification/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-gr-notification/ballot/


No IPR declarations have been submitted directly on this I-D.





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From: "Krishna Muddenahally Ananthamurthy (kriswamy)" <kriswamy@cisco.com>
To: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>, "idr@ietf.org" <idr@ietf.org>
CC: "lsvr@ietf.org" <lsvr@ietf.org>, "draft-keyupate-lsvr-bgp-spf@ietf.org" <draft-keyupate-lsvr-bgp-spf@ietf.org>
Thread-Topic: [Idr] FW: Requested: Volunteers to review draft-keyupate-lsvr-bgp-spf-00
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Date: Wed, 11 Apr 2018 00:30:06 +0000
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References: <AM5PR0701MB283650DBB29390E5C874B339E0A10@AM5PR0701MB2836.eurprd07.prod.outlook.com> <AM5PR0701MB2836609FC0F71BB5A640B4E4E0A10@AM5PR0701MB2836.eurprd07.prod.outlook.com> <B05A6AB8-EE71-40D0-97ED-C6E3FE7C070F@cisco.com>
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From nobody Tue Apr 10 20:20:29 2018
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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: "'Susan Hares'" <shares@ndzh.com>, "'idr wg'" <idr@ietf.org>
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This is a multi-part message in MIME format.

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Hi, Susan and Authors of this draft:

=20

Sorry to reply this LC so late.  The followings are my suggestions to =
this
draft based on the discussion related to the mail thread
https://mailarchive.ietf.org/arch/msg/idr/vSeflAMCMPL25N4nBOZu8yG19HA

Is it too late to response?  Please see the reply below in line.

=20

Best Regards.

=20

Aijun Wang

Network R&D and Operation Support Department

China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.

=20

=B7=A2=BC=FE=C8=CB: Susan Hares [mailto:shares@ndzh.com]=20
=B7=A2=CB=CD=CA=B1=BC=E4: 2018=C4=EA3=D4=C28=C8=D5 0:41
=CA=D5=BC=FE=C8=CB: 'idr wg'
=D6=F7=CC=E2: [Idr] WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7
to March 21)

=20

This begins a 2 week WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04.
txt from March 7th to March 21.  During your discussion in the WG LC, =
please
indicate the following things:=20

=20

1)      Do you think BGP should carry these link state information =
regarding
segment routing,=20

=A1=B0Source Router Identifier (Source Router-ID) TLV=A1=B1 should be =
stripped off
this draft, because there are other situations(more general scenarios
besides SR) that requires the source router of the prefixes, as =
described in
https://datatracker.ietf.org/doc/draft-wang-idr-bgpls-inter-as-topology-e=
xt/
and discussed in mail thread
https://mailarchive.ietf.org/arch/msg/idr/-T7U1yg8DmSdDmtyfqBgtnkO4I0

2)      Are there any technical issues with this draft?=20

=20

Some clarifications should be added in the following sections:

a) Regarding the usage of SID/Label sub-TLV:

=A1=B02.1.2 SR-Capabilities TLV=A1=B1, =A1=B02.1.4 SR Local Block =
TLV=A1=B1 requires all the
presence of =A1=B0SID/Label sub-TLV=A1=B1.  It is more clear to indicate =
 this
=A1=B0SID/Label sub-TLV=A1=B1 represent the base of the =A1=B0Range =
Size=A1=B1.=20

b) Regarding the inconsistence definition among =
=A1=B0ISIS/OSPF/OSPFv3/BGP-LS=A1=B1
:

    =A1=B02.2.1 Adjacency SID=A1=B1, =A1=B02.2.2 LAN Adjacency SID =
TLV=A1=B1,=A1=B12.3.1
Prefix-SID TLV=A1=B1

Note for =A1=B0Length=A1=B1 field:   2-bytes =A1=B0Reserved=A1=B1 filed =
should be added when
copying the corresponding fields from IS-IS protocol=20

                c) Regarding the definition =A1=B0Range TLV=A1=B1:

                    if the =A1=B0Length=A1=B1 filed is 4, how to detect =
the
existence of =A1=B0sub-TLV?=A1=B1=20

                    Is it more clear to rename the =A1=B0Range TLV=A1=B1 =
as
=A1=B0Mapping-Range TLV=A1=B1, so as to distinguish it from the previous =
=A1=B0Range
filed=A1=B1 in  =A1=B02.1.2 SR-Capabilities TLV=A1=B1?

                d) Regarding  the contents for =A1=B03. =
Procedures=A1=B1:

                   Suggest to delete this section, because:

-------Contents in section 3.1, 3.2 has been mentioned in corresponding =
TLV
definition(section 2.3.1), there is no more new information in this =
section.

-------Contents in  section 3.3 and 3.4 should be merged with section =
2.3.4
to eliminate the inconsistence arose in future when update parts of =
them.

=20

3)      Is this draft is ready for publication?=20

If the above issued is solved, it is ready for publication.

=20

For your quick access to this draft, click on the link below:=20

=20

https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-ex=
t/

=20

=20

Susan Hares

=20


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<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
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<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DZH-CN link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Hi, Susan and =
Authors of this draft:<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Sorry to reply this LC so =
late.&nbsp; The followings are my suggestions to this draft based on the =
discussion related to the mail thread <a =
href=3D"https://mailarchive.ietf.org/arch/msg/idr/vSeflAMCMPL25N4nBOZu8yG=
19HA">https://mailarchive.ietf.org/arch/msg/idr/vSeflAMCMPL25N4nBOZu8yG19=
HA</a><o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Is it too late to =
response?&nbsp; Please see the reply below in =
line.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Network R&amp;D =
and Operation Support Department<o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>China Telecom =
Corporation Limited Beijing Research Institute,Beijing, =
China.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><div=
><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0cm 0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=B7=A2=BC=FE=C8=CB<sp=
an lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'> Susan Hares =
[mailto:shares@ndzh.com] <br></span><b><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=B7=A2=CB=CD=CA=B1=BC=
=E4<span lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'> 2018</span><span =
style=3D'font-size:10.0pt;font-family:=CB=CE=CC=E5'>=C4=EA<span =
lang=3DEN-US>3</span>=D4=C2<span lang=3DEN-US>8</span>=C8=D5 <span =
lang=3DEN-US>0:41<br></span><b>=CA=D5=BC=FE=C8=CB<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> 'idr =
wg'<br></span><b>=D6=F7=CC=E2<span lang=3DEN-US>:</span></b><span =
lang=3DEN-US> [Idr] WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March =
21)<o:p></o:p></span></span></p></div></div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>This begins a 2 week WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04.txt from March =
7<sup>th</sup> to March 21.&nbsp; During your discussion in the WG LC, =
please indicate the following things: <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoListParagraph style=3D'text-indent:-18.0pt;mso-list:l0 level1 =
lfo2'><![if !supportLists]><span lang=3DEN-US><span =
style=3D'mso-list:Ignore'>1)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span lang=3DEN-US>Do you think BGP =
should carry these link state information regarding segment routing, =
<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-indent:3=
5.15pt;mso-line-height-alt:0pt'><b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:black'>=A1=B0Source Router Identifier (Source Router-ID) =
TLV=A1=B1 </span></b><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>should be stripped off this =
draft, because there are other situations(more general scenarios besides =
SR) that requires the source router of the prefixes, as described in <a =
href=3D"https://datatracker.ietf.org/doc/draft-wang-idr-bgpls-inter-as-to=
pology-ext/">https://datatracker.ietf.org/doc/draft-wang-idr-bgpls-inter-=
as-topology-ext/</a> and discussed in mail thread <a =
href=3D"https://mailarchive.ietf.org/arch/msg/idr/-T7U1yg8DmSdDmtyfqBgtnk=
O4I0">https://mailarchive.ietf.org/arch/msg/idr/-T7U1yg8DmSdDmtyfqBgtnkO4=
I0</a><o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'text-indent:-18.0pt;mso-list:l0 level1 lfo2'><![if =
!supportLists]><span lang=3DEN-US><span =
style=3D'mso-list:Ignore'>2)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span lang=3DEN-US>Are there any =
technical issues with this draft? <o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Some clarifications should be =
added in the following sections:<o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>a) Regarding the usage of =
SID/Label sub-TLV:<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-indent:47.25pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>=A1=B02.1.2 SR-Capabilities =
TLV=A1=B1, =A1=B02.1.4 SR Local Block TLV=A1=B1 requires all the =
presence of =A1=B0SID/Label sub-TLV=A1=B1. &nbsp;It is more clear to =
indicate &nbsp;this =A1=B0SID/Label sub-TLV=A1=B1 represent the base of =
the =A1=B0Range Size=A1=B1. <o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>b) Regarding the inconsistence =
definition among =A1=B0ISIS/OSPF/OSPFv3/BGP-LS=A1=B1 =
:<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp; =A1=B02.2.1 =
Adjacency SID=A1=B1, =A1=B02.2.2 LAN Adjacency SID TLV=A1=B1,=A1=B12.3.1 =
Prefix-SID TLV=A1=B1<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt;text-indent:9.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Note for =A1=B0Length=A1=B1 =
field: &nbsp;&nbsp;2-bytes =A1=B0Reserved=A1=B1 filed should be added =
when copying the corresponding fields from IS-IS protocol =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c) =
Regarding the definition =A1=B0Range TLV=A1=B1:<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; if the =A1=B0Length=A1=B1 filed is 4, how to detect the =
existence of =A1=B0sub-TLV?=A1=B1 <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;Is it more clear to rename the =A1=B0Range TLV=A1=B1 as =
=A1=B0Mapping-Range TLV=A1=B1, so as to distinguish it from the previous =
=A1=B0Range filed=A1=B1 in &nbsp;=A1=B02.1.2 SR-Capabilities =
TLV=A1=B1?<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d) Regarding =
&nbsp;the contents for =A1=B03. =
Procedures=A1=B1:<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; Suggest to delete this section, because:<o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'text-indent:42.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>-------Contents in section 3.1, =
3.2 has been mentioned in corresponding TLV definition(section 2.3.1), =
there is no more new information in this =
section.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-indent:42.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>-------Contents in =
&nbsp;section 3.3 and 3.4 should be merged with section 2.3.4 to =
eliminate the inconsistence arose in future when update parts of =
them.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoListParagraph style=3D'text-indent:-18.0pt;mso-list:l0 level1 =
lfo2'><![if !supportLists]><span lang=3DEN-US><span =
style=3D'mso-list:Ignore'>3)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span lang=3DEN-US>Is this draft is ready =
for publication? <o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>If the above issued is solved, =
it is ready for publication.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>For your quick access to this =
draft, click on the link below: <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><a =
href=3D"https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-ro=
uting-ext/">https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segmen=
t-routing-ext/</a><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>Susan Hares<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div></body></html>
------=_NextPart_000_005A_01D3D187.110D49B0--


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Subject: [Idr] I-D Action: draft-ietf-idr-bgp-optimal-route-reflection-16.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : BGP Optimal Route Reflection (BGP-ORR)
        Authors         : Robert Raszuk
                          Christian Cassar
                          Erik Aman
                          Bruno Decraene
                          Kevin Wang
	Filename        : draft-ietf-idr-bgp-optimal-route-reflection-16.txt
	Pages           : 14
	Date            : 2018-04-11

Abstract:
   This document proposes a solution for BGP route reflectors to allow
   them to choose the best path for their clients that the clients
   themselves would have chosen under the same conditions, without
   requiring further state or any new features to be placed on the
   clients.  This facilitates, for example, best exit point policy (hot
   potato routing).  This solution is primarily applicable in
   deployments using centralized route reflectors.

   The solution relies upon all route reflectors learning all paths
   which are eligible for consideration.  Best path selection is
   performed in each route reflector based on a configured virtual
   location in the IGP.  The location can be the same for all clients or
   different per peer/update group or per peer.  Best path selection can
   also be performed based on user configured policies in each route
   reflector.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-optimal-route-reflection/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-optimal-route-reflection-16
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-optimal-route-reflection-16

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-bgp-optimal-route-reflection-16


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

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


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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
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<body lang=3D"EN-IN" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Hi Aijun,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Please check inline below in your email for responses. Do let me know =
if this addresses your comments and I will post the updates accordingly.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Ketan<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Idr &lt;idr-bounces@ietf.org&gt;
<b>On Behalf Of </b>Aijun Wang<br>
<b>Sent:</b> 11 April 2018 08:50<br>
<b>To:</b> 'Susan Hares' &lt;shares@ndzh.com&gt;; 'idr wg' &lt;idr@ietf.org=
&gt;<br>
<b>Subject:</b> [Idr] </span><span lang=3D"ZH-CN" style=3D"font-family:SimS=
un">=B4=F0=B8=B4</span><span lang=3D"EN-US">: WG LC for draft-ietf-idr-bgp-=
ls-segment-routing-ext-04 (March 7 to March 21)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Hi, Susan and Authors of this draft:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Sorry to reply this LC so late.&nbsp; The followings are my sugge=
stions to this draft based on the discussion related to the mail thread
<a href=3D"https://mailarchive.ietf.org/arch/msg/idr/vSeflAMCMPL25N4nBOZu8y=
G19HA">https://mailarchive.ietf.org/arch/msg/idr/vSeflAMCMPL25N4nBOZu8yG19H=
A</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Is it too late to response?&nbsp; Please see the reply below in l=
ine.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:#1F497D">Best Re=
gards.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:#1F497D">Aijun W=
ang<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:#1F497D">Network=
 R&amp;D and Operation Support Department<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideog=
raph"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:#1F497D">China T=
elecom Corporation Limited Beijing Research Institute,Beijing, China.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"ZH-CN" style=3D"font-size:10.0pt;fo=
nt-family:SimSun">=B7=A2=BC=FE=C8=CB</span></b><b><span lang=3D"EN-US" styl=
e=3D"font-size:10.0pt;font-family:SimSun">:</span></b><span lang=3D"EN-US" =
style=3D"font-size:10.0pt;font-family:SimSun"> Susan Hares [<a href=3D"mail=
to:shares@ndzh.com">mailto:shares@ndzh.com</a>]
<br>
</span><b><span lang=3D"ZH-CN" style=3D"font-size:10.0pt;font-family:SimSun=
">=B7=A2=CB=CD=CA=B1=BC=E4</span></b><b><span lang=3D"EN-US" style=3D"font-=
size:10.0pt;font-family:SimSun">:</span></b><span lang=3D"EN-US" style=3D"f=
ont-size:10.0pt;font-family:SimSun"> 2018</span><span lang=3D"ZH-CN" style=
=3D"font-size:10.0pt;font-family:SimSun">=C4=EA</span><span lang=3D"EN-US" =
style=3D"font-size:10.0pt;font-family:SimSun">3</span><span lang=3D"ZH-CN" =
style=3D"font-size:10.0pt;font-family:SimSun">=D4=C2</span><span lang=3D"EN=
-US" style=3D"font-size:10.0pt;font-family:SimSun">8</span><span lang=3D"ZH=
-CN" style=3D"font-size:10.0pt;font-family:SimSun">=C8=D5
</span><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:SimSun">0=
:41<br>
</span><b><span lang=3D"ZH-CN" style=3D"font-size:10.0pt;font-family:SimSun=
">=CA=D5=BC=FE=C8=CB</span></b><b><span lang=3D"EN-US" style=3D"font-size:1=
0.0pt;font-family:SimSun">:</span></b><span lang=3D"EN-US" style=3D"font-si=
ze:10.0pt;font-family:SimSun"> 'idr wg'<br>
</span><b><span lang=3D"ZH-CN" style=3D"font-size:10.0pt;font-family:SimSun=
">=D6=F7=CC=E2</span></b><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;=
font-family:SimSun">:</span></b><span lang=3D"EN-US" style=3D"font-size:10.=
0pt;font-family:SimSun"> [Idr] WG LC for draft-ietf-idr-bgp-ls-segment-rout=
ing-ext-04
 (March 7 to March 21)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">This begins a 2 week WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04.txt from March 7<sup>th</sup> =
to March 21.&nbsp; During your discussion in the WG LC, please indicate the=
 following things:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">1)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Do you think BGP should=
 carry these link state information regarding segment routing,
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;text-indent:35.15pt;mso-line-height-alt:0pt">
<b><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier=
 New&quot;;color:black">=A1=B0Source Router Identifier (Source Router-ID) T=
LV=A1=B1
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:#1F497D">sh=
ould be stripped off this draft, because there are other situations(more ge=
neral scenarios besides SR) that requires the source router of the prefixes=
, as described in
<a href=3D"https://datatracker.ietf.org/doc/draft-wang-idr-bgpls-inter-as-t=
opology-ext/">
https://datatracker.ietf.org/doc/draft-wang-idr-bgpls-inter-as-topology-ext=
/</a> and discussed in mail thread
<a href=3D"https://mailarchive.ietf.org/arch/msg/idr/-T7U1yg8DmSdDmtyfqBgtn=
kO4I0">https://mailarchive.ietf.org/arch/msg/idr/-T7U1yg8DmSdDmtyfqBgtnkO4I=
0</a><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;mso-line-height-alt:0pt">
<b><i><span lang=3D"EN-US" style=3D"color:#1F497D">[KT] You are right that =
Source Router-ID TLV is not SR specific. SR was one of the key use-cases wh=
ere this was felt this was necessary especially in ISIS (see rfc7794). The =
authors of the BGP-LS SR draft felt
 it was necessary to introduce and cover it as part of this draft given the=
 use-cases. It has been part of this draft since many years and even before=
 it was adopted by the WG. It has implementations and deployments. I would =
say you are too late in bringing
 forward such a comment at this stage. With regards to the inter-AS draft, =
you have seen the responses on the WG mailer as well as at London and I do =
not have anything further to add.</span></i></b><span lang=3D"EN-US" style=
=3D"color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">2)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Are there any technical=
 issues with this draft?
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;color:#1F497D">Some clarifications should be added =
in the following sections:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;color:#1F497D">a) Regarding the usage of SID/Label =
sub-TLV:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:47.25pt"><span lang=3D"EN-US" s=
tyle=3D"font-size:10.5pt;color:#1F497D">=A1=B02.1.2 SR-Capabilities TLV=A1=
=B1, =A1=B02.1.4 SR Local Block TLV=A1=B1 requires all the presence of =A1=
=B0SID/Label sub-TLV=A1=B1. &nbsp;It is more clear to indicate &nbsp;this =
=A1=B0SID/Label
 sub-TLV=A1=B1 represent the base of the =A1=B0Range Size=A1=B1. <o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US" style=3D"color:#1F497D">[=
KT] How about instead of =A1=B0SID/Label sub-TLV (as defined in Section 2.1=
.1).=A1=B1 we change it to =A1=B0SID/Label sub-TLV (as defined in Section 2=
.1.1) which encodes the first label in the range.=A1=B1? Would
 this help clarify?<o:p></o:p></span></i></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;color:#1F497D">b) Regarding the inconsistence defin=
ition among =A1=B0ISIS/OSPF/OSPFv3/BGP-LS=A1=B1 :<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;color:#1F497D">&nbsp;&nbsp;&nbsp; =A1=B02.2.1 Adjac=
ency SID=A1=B1, =A1=B02.2.2 LAN Adjacency SID TLV=A1=B1,=A1=B12.3.1 Prefix-=
SID TLV=A1=B1<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:9.0pt"><span=
 lang=3D"EN-US" style=3D"font-size:10.5pt;color:#1F497D">Note for =A1=B0Len=
gth=A1=B1 field: &nbsp;&nbsp;2-bytes =A1=B0Reserved=A1=B1 filed should be a=
dded when copying the corresponding fields from IS-IS protocol
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US" style=3D"color:#1F497D">[=
KT] Now about for Length, we say for Adj-SID &amp; Prefix-SID =A8C =A1=B0Va=
riable, 7 or 8 depending on Label or Index encoding of the SID=A1=B1 and fo=
r LAN-Adj-SID we say =A1=B0Variable. For ISIS it would be 13
 or 14 depending on Label or Index encoding of the SID. For OSPF it would b=
e 11 or 12 depending on Label or Index encoding of the SID.=A1=B1<o:p></o:p=
></span></i></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c) Regarding the definition =A1=B0Range TLV=
=A1=B1:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if the =A1=B0Length=A1=B1=
 filed is 4, how to detect the existence of =A1=B0sub-TLV?=A1=B1
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US" style=3D"color:#1F497D">[=
KT] You are right. The length should be variable since we have sub-TLVs and=
 also the Prefix SID sub-TLV SHOULD be present to indicate the first label =
of the Range. I will correct this.<o:p></o:p></span></i></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Is it more clear to =
rename the =A1=B0Range TLV=A1=B1 as =A1=B0Mapping-Range TLV=A1=B1, so as to=
 distinguish it from the previous =A1=B0Range filed=A1=B1 in &nbsp;=A1=B02.=
1.2 SR-Capabilities TLV=A1=B1?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US" style=3D"color:#1F497D">[=
KT] I am not sure if we should make this name change at this stage. I don=
=A1=AFt see the confusion between the two TLVs. However, if there is WG con=
sensus to make this change then I would do so.<o:p></o:p></span></i></b></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; d) Regarding &nbsp;the contents for =A1=B03. Proc=
edures=A1=B1:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Suggest to delete this section,=
 because:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:42.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;color:#1F497D">-------Contents in section 3.1, 3.2 =
has been mentioned in corresponding TLV definition(section 2.3.1), there is=
 no more new information in this section.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US" style=3D"color:#1F497D">[=
KT] OK will do.<o:p></o:p></span></i></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:42.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;color:#1F497D">-------Contents in &nbsp;section 3.3=
 and 3.4 should be merged with section 2.3.4 to eliminate the inconsistence=
 arose in future when update parts of them.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US" style=3D"color:#1F497D">[=
KT] Sure, I will update it in that way too since it will be all info in one=
 place for the reader.</span></i></b><span lang=3D"EN-US" style=3D"color:#1=
F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">3)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbs=
p;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Is this draft is ready =
for publication?
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;color:#1F497D">If the above issued is solved, it is=
 ready for publication.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">For your quick access to this d=
raft, click on the link below:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.=
ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-ext/">https://datatracke=
r.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-ext/</a><o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Susan Hares<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
</body>
</html>

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Hi, Ketan:
I think the revised version is more clear.

Regarding the Source Router Identifier (Source Router-ID) TLV=E2=80=9D, I th=
ink stripped it from the current draft did not influence the implementation o=
n the device. We just reorganize the reference for this TLV, put it into the=
 most suitable document for BGP-LS extension.
This TLV is more relevant to the Inter-AS situation and should be extended t=
o cover all IGP scenarios, not just for ISIS in current document.
If possible, I can invite the author of this draft to be the co-authors of t=
he BGP-LS inter-as extension draft.

Except this point, I fully agree with you the updates.



> =E5=9C=A8 2018=E5=B9=B44=E6=9C=8811=E6=97=A5=EF=BC=8C17:59=EF=BC=8CKetan T=
alaulikar (ketant) <ketant@cisco.com> =E5=86=99=E9=81=93=EF=BC=9A
>=20
> Hi Aijun,
> =20
> Please check inline below in your email for responses. Do let me know if t=
his addresses your comments and I will post the updates accordingly.
> =20
> Thanks,
> Ketan
> =20
> From: Idr <idr-bounces@ietf.org> On Behalf Of Aijun Wang
> Sent: 11 April 2018 08:50
> To: 'Susan Hares' <shares@ndzh.com>; 'idr wg' <idr@ietf.org>
> Subject: [Idr] =E7=AD=94=E5=A4=8D: WG LC for draft-ietf-idr-bgp-ls-segment=
-routing-ext-04 (March 7 to March 21)
> =20
> Hi, Susan and Authors of this draft:
> =20
> Sorry to reply this LC so late.  The followings are my suggestions to this=
 draft based on the discussion related to the mail thread https://mailarchiv=
e.ietf.org/arch/msg/idr/vSeflAMCMPL25N4nBOZu8yG19HA
> Is it too late to response?  Please see the reply below in line.
> =20
> Best Regards.
> =20
> Aijun Wang
> Network R&D and Operation Support Department
> China Telecom Corporation Limited Beijing Research Institute,Beijing, Chin=
a.
> =20
> =E5=8F=91=E4=BB=B6=E4=BA=BA: Susan Hares [mailto:shares@ndzh.com]=20
> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B43=E6=9C=888=E6=97=A5 0:=
41
> =E6=94=B6=E4=BB=B6=E4=BA=BA: 'idr wg'
> =E4=B8=BB=E9=A2=98: [Idr] WG LC for draft-ietf-idr-bgp-ls-segment-routing-=
ext-04 (March 7 to March 21)
> =20
> This begins a 2 week WG LC for draft-ietf-idr-bgp-ls-segment-routing-ext-0=
4.txt from March 7th to March 21.  During your discussion in the WG LC, plea=
se indicate the following things:
> =20
> 1)     Do you think BGP should carry these link state information regardin=
g segment routing,
> =E2=80=9CSource Router Identifier (Source Router-ID) TLV=E2=80=9D should b=
e stripped off this draft, because there are other situations(more general s=
cenarios besides SR) that requires the source router of the prefixes, as des=
cribed in https://datatracker.ietf.org/doc/draft-wang-idr-bgpls-inter-as-top=
ology-ext/ and discussed in mail thread https://mailarchive.ietf.org/arch/ms=
g/idr/-T7U1yg8DmSdDmtyfqBgtnkO4I0
> [KT] You are right that Source Router-ID TLV is not SR specific. SR was on=
e of the key use-cases where this was felt this was necessary especially in I=
SIS (see rfc7794). The authors of the BGP-LS SR draft felt it was necessary t=
o introduce and cover it as part of this draft given the use-cases. It has b=
een part of this draft since many years and even before it was adopted by th=
e WG. It has implementations and deployments. I would say you are too late i=
n bringing forward such a comment at this stage. With regards to the inter-A=
S draft, you have seen the responses on the WG mailer as well as at London a=
nd I do not have anything further to add.
> 2)     Are there any technical issues with this draft?
> =20
> Some clarifications should be added in the following sections:
> a) Regarding the usage of SID/Label sub-TLV:
> =E2=80=9C2.1.2 SR-Capabilities TLV=E2=80=9D, =E2=80=9C2.1.4 SR Local Block=
 TLV=E2=80=9D requires all the presence of =E2=80=9CSID/Label sub-TLV=E2=80=9D=
.  It is more clear to indicate  this =E2=80=9CSID/Label sub-TLV=E2=80=9D re=
present the base of the =E2=80=9CRange Size=E2=80=9D.
> [KT] How about instead of =E2=80=9CSID/Label sub-TLV (as defined in Sectio=
n 2.1.1).=E2=80=9D we change it to =E2=80=9CSID/Label sub-TLV (as defined in=
 Section 2.1.1) which encodes the first label in the range.=E2=80=9D? Would =
 this help clarify?
> =20
> b) Regarding the inconsistence definition among =E2=80=9CISIS/OSPF/OSPFv3/=
BGP-LS=E2=80=9D :
>     =E2=80=9C2.2.1 Adjacency SID=E2=80=9D, =E2=80=9C2.2.2 LAN Adjacency SI=
D TLV=E2=80=9D,=E2=80=9D2.3.1 Prefix-SID TLV=E2=80=9D
> Note for =E2=80=9CLength=E2=80=9D field:   2-bytes =E2=80=9CReserved=E2=80=
=9D filed should be added when copying the corresponding fields from IS-IS p=
rotocol
> [KT] Now about for Length, we say for Adj-SID & Prefix-SID =E2=80=93 =E2=80=
=9CVariable, 7 or 8 depending on Label or Index encoding of the SID=E2=80=9D=
 and for LAN-Adj-SID we say =E2=80=9CVariable. For ISIS it would be 13 or 14=
 depending on Label or Index encoding of the SID. For OSPF it would be 11 or=
 12 depending on Label or Index encoding of the SID.=E2=80=9D
> =20
>                 c) Regarding the definition =E2=80=9CRange TLV=E2=80=9D:
>                     if the =E2=80=9CLength=E2=80=9D filed is 4, how to det=
ect the existence of =E2=80=9Csub-TLV?=E2=80=9D
> [KT] You are right. The length should be variable since we have sub-TLVs a=
nd also the Prefix SID sub-TLV SHOULD be present to indicate the first label=
 of the Range. I will correct this.
> =20
>                     Is it more clear to rename the =E2=80=9CRange TLV=E2=80=
=9D as =E2=80=9CMapping-Range TLV=E2=80=9D, so as to distinguish it from the=
 previous =E2=80=9CRange filed=E2=80=9D in  =E2=80=9C2.1.2 SR-Capabilities T=
LV=E2=80=9D?
> [KT] I am not sure if we should make this name change at this stage. I don=
=E2=80=99t see the confusion between the two TLVs. However, if there is WG c=
onsensus to make this change then I would do so.
> =20
>                 d) Regarding  the contents for =E2=80=9C3. Procedures=E2=80=
=9D:
>                    Suggest to delete this section, because:
> -------Contents in section 3.1, 3.2 has been mentioned in corresponding TL=
V definition(section 2.3.1), there is no more new information in this sectio=
n.
> [KT] OK will do.
> =20
> -------Contents in  section 3.3 and 3.4 should be merged with section 2.3.=
4 to eliminate the inconsistence arose in future when update parts of them.
> [KT] Sure, I will update it in that way too since it will be all info in o=
ne place for the reader.
> =20
> 3)     Is this draft is ready for publication?
> If the above issued is solved, it is ready for publication.
> =20
> For your quick access to this draft, click on the link below:
> =20
> https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-ext=
/
> =20
> =20
> Susan Hares
> =20

--Apple-Mail-3389FA07-5DA6-4519-96F5-1C3A3D0AA1F0
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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">Hi, Ketan:<div>I think the revised version i=
s more clear.</div><div><br></div><div>Regarding the&nbsp;<b style=3D"text-i=
ndent: 35.15pt;"><span lang=3D"EN-US" style=3D"background-color: rgba(255, 2=
55, 255, 0);">Source Router Identifier (Source Router-ID) TLV=E2=80=9D,&nbsp=
;</span></b>I think stripped it from the current draft did not influence the=
 implementation on the device. We just reorganize the reference for this TLV=
, put it into the most suitable document for BGP-LS extension.</div><div>Thi=
s TLV is more relevant to the Inter-AS situation and should be extended to c=
over all IGP scenarios, not just for ISIS in current document.</div><div>If p=
ossible, I can invite the author of this draft to be the co-authors of the B=
GP-LS inter-as extension draft.</div><div><br></div><div>Except this point, I=
 fully agree with you the updates.</div><div><br><div><br></div><div><br>=E5=
=9C=A8 2018=E5=B9=B44=E6=9C=8811=E6=97=A5=EF=BC=8C17:59=EF=BC=8CKetan Talaul=
ikar (ketant) &lt;<a href=3D"mailto:ketant@cisco.com">ketant@cisco.com</a>&g=
t; =E5=86=99=E9=81=93=EF=BC=9A<br><br></div><blockquote type=3D"cite"><div>

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US">Hi Aijun,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US">Please check inline below in your email for responses. Do let me know if=
 this addresses your comments and I will post the updates accordingly.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US">Ketan<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0=
cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=3D=
"EN-US"> Idr &lt;<a href=3D"mailto:idr-bounces@ietf.org">idr-bounces@ietf.or=
g</a>&gt;
<b>On Behalf Of </b>Aijun Wang<br>
<b>Sent:</b> 11 April 2018 08:50<br>
<b>To:</b> 'Susan Hares' &lt;<a href=3D"mailto:shares@ndzh.com">shares@ndzh.=
com</a>&gt;; 'idr wg' &lt;<a href=3D"mailto:idr@ietf.org">idr@ietf.org</a>&g=
t;<br>
<b>Subject:</b> [Idr] </span><span lang=3D"ZH-CN" style=3D"font-family:SimSu=
n">=E7=AD=94=E5=A4=8D</span><span lang=3D"EN-US">: WG LC for draft-ietf-idr-=
bgp-ls-segment-routing-ext-04 (March 7 to March 21)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:=
#1F497D">Hi, Susan and Authors of this draft:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:=
#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:=
#1F497D">Sorry to reply this LC so late.&nbsp; The followings are my suggest=
ions to this draft based on the discussion related to the mail thread
<a href=3D"https://mailarchive.ietf.org/arch/msg/idr/vSeflAMCMPL25N4nBOZu8yG=
19HA">https://mailarchive.ietf.org/arch/msg/idr/vSeflAMCMPL25N4nBOZu8yG19HA<=
/a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:=
#1F497D">Is it too late to response?&nbsp; Please see the reply below in lin=
e.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:=
#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideogr=
aph"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:#1F497D">Best Rega=
rds.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideogr=
aph"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:#1F497D"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideogr=
aph"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:#1F497D">Aijun Wan=
g<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideogr=
aph"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:#1F497D">Network R=
&amp;D and Operation Support Department<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-align:justify;text-justify:inter-ideogr=
aph"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:#1F497D">China Tel=
ecom Corporation Limited Beijing Research Institute,Beijing, China.<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:=
#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0=
cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"ZH-CN" style=3D"font-size:10.0pt;fon=
t-family:SimSun">=E5=8F=91=E4=BB=B6=E4=BA=BA</span></b><b><span lang=3D"EN-U=
S" style=3D"font-size:10.0pt;font-family:SimSun">:</span></b><span lang=3D"E=
N-US" style=3D"font-size:10.0pt;font-family:SimSun"> Susan Hares [<a href=3D=
"mailto:shares@ndzh.com">mailto:shares@ndzh.com</a>]
<br>
</span><b><span lang=3D"ZH-CN" style=3D"font-size:10.0pt;font-family:SimSun"=
>=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4</span></b><b><span lang=3D"EN-US" styl=
e=3D"font-size:10.0pt;font-family:SimSun">:</span></b><span lang=3D"EN-US" s=
tyle=3D"font-size:10.0pt;font-family:SimSun"> 2018</span><span lang=3D"ZH-CN=
" style=3D"font-size:10.0pt;font-family:SimSun">=E5=B9=B4</span><span lang=3D=
"EN-US" style=3D"font-size:10.0pt;font-family:SimSun">3</span><span lang=3D"=
ZH-CN" style=3D"font-size:10.0pt;font-family:SimSun">=E6=9C=88</span><span l=
ang=3D"EN-US" style=3D"font-size:10.0pt;font-family:SimSun">8</span><span la=
ng=3D"ZH-CN" style=3D"font-size:10.0pt;font-family:SimSun">=E6=97=A5
</span><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:SimSun">0:=
41<br>
</span><b><span lang=3D"ZH-CN" style=3D"font-size:10.0pt;font-family:SimSun"=
>=E6=94=B6=E4=BB=B6=E4=BA=BA</span></b><b><span lang=3D"EN-US" style=3D"font=
-size:10.0pt;font-family:SimSun">:</span></b><span lang=3D"EN-US" style=3D"f=
ont-size:10.0pt;font-family:SimSun"> 'idr wg'<br>
</span><b><span lang=3D"ZH-CN" style=3D"font-size:10.0pt;font-family:SimSun"=
>=E4=B8=BB=E9=A2=98</span></b><b><span lang=3D"EN-US" style=3D"font-size:10.=
0pt;font-family:SimSun">:</span></b><span lang=3D"EN-US" style=3D"font-size:=
10.0pt;font-family:SimSun"> [Idr] WG LC for draft-ietf-idr-bgp-ls-segment-ro=
uting-ext-04
 (March 7 to March 21)<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">This begins a 2 week WG LC for d=
raft-ietf-idr-bgp-ls-segment-routing-ext-04.txt from March 7<sup>th</sup> to=
 March 21.&nbsp; During your discussion in the WG LC, please indicate the fo=
llowing things:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 level=
1 lfo2"><!--[if !supportLists]--><span lang=3D"EN-US"><span style=3D"mso-lis=
t:Ignore">1)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nb=
sp;&nbsp;&nbsp;
</span></span></span><!--[endif]--><span lang=3D"EN-US">Do you think BGP sho=
uld carry these link state information regarding segment routing,
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;text-indent:35.15pt;mso-line-height-alt:0pt">
<b><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier N=
ew&quot;;color:black">=E2=80=9CSource Router Identifier (Source Router-ID) T=
LV=E2=80=9D
</span></b><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:#1F497D">sho=
uld be stripped off this draft, because there are other situations(more gene=
ral scenarios besides SR) that requires the source router of the prefixes, a=
s described in
<a href=3D"https://datatracker.ietf.org/doc/draft-wang-idr-bgpls-inter-as-to=
pology-ext/">
https://datatracker.ietf.org/doc/draft-wang-idr-bgpls-inter-as-topology-ext/=
</a> and discussed in mail thread
<a href=3D"https://mailarchive.ietf.org/arch/msg/idr/-T7U1yg8DmSdDmtyfqBgtnk=
O4I0">https://mailarchive.ietf.org/arch/msg/idr/-T7U1yg8DmSdDmtyfqBgtnkO4I0<=
/a><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;mso-line-height-alt:0pt">
<b><i><span lang=3D"EN-US" style=3D"color:#1F497D">[KT] You are right that S=
ource Router-ID TLV is not SR specific. SR was one of the key use-cases wher=
e this was felt this was necessary especially in ISIS (see rfc7794). The aut=
hors of the BGP-LS SR draft felt
 it was necessary to introduce and cover it as part of this draft given the u=
se-cases. It has been part of this draft since many years and even before it=
 was adopted by the WG. It has implementations and deployments. I would say y=
ou are too late in bringing
 forward such a comment at this stage. With regards to the inter-AS draft, y=
ou have seen the responses on the WG mailer as well as at London and I do no=
t have anything further to add.</span></i></b><span lang=3D"EN-US" style=3D"=
color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 level=
1 lfo2"><!--[if !supportLists]--><span lang=3D"EN-US"><span style=3D"mso-lis=
t:Ignore">2)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nb=
sp;&nbsp;&nbsp;
</span></span></span><!--[endif]--><span lang=3D"EN-US">Are there any techni=
cal issues with this draft?
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" sty=
le=3D"font-size:10.5pt;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" sty=
le=3D"font-size:10.5pt;color:#1F497D">Some clarifications should be added in=
 the following sections:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" sty=
le=3D"font-size:10.5pt;color:#1F497D">a) Regarding the usage of SID/Label su=
b-TLV:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:47.25pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;color:#1F497D">=E2=80=9C2.1.2 SR-Capabilities TLV=E2=
=80=9D, =E2=80=9C2.1.4 SR Local Block TLV=E2=80=9D requires all the presence=
 of =E2=80=9CSID/Label sub-TLV=E2=80=9D. &nbsp;It is more clear to indicate &=
nbsp;this =E2=80=9CSID/Label
 sub-TLV=E2=80=9D represent the base of the =E2=80=9CRange Size=E2=80=9D. <o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US" style=3D"color:#1F497D">[K=
T] How about instead of =E2=80=9CSID/Label sub-TLV (as defined in Section 2.=
1.1).=E2=80=9D we change it to =E2=80=9CSID/Label sub-TLV (as defined in Sec=
tion 2.1.1) which encodes the first label in the range.=E2=80=9D? Would
 this help clarify?<o:p></o:p></span></i></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&nb=
sp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" sty=
le=3D"font-size:10.5pt;color:#1F497D">b) Regarding the inconsistence definit=
ion among =E2=80=9CISIS/OSPF/OSPFv3/BGP-LS=E2=80=9D :<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" sty=
le=3D"font-size:10.5pt;color:#1F497D">&nbsp;&nbsp;&nbsp; =E2=80=9C2.2.1 Adja=
cency SID=E2=80=9D, =E2=80=9C2.2.2 LAN Adjacency SID TLV=E2=80=9D,=E2=80=9D2=
.3.1 Prefix-SID TLV=E2=80=9D<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;text-indent:9.0pt"><span l=
ang=3D"EN-US" style=3D"font-size:10.5pt;color:#1F497D">Note for =E2=80=9CLen=
gth=E2=80=9D field: &nbsp;&nbsp;2-bytes =E2=80=9CReserved=E2=80=9D filed sho=
uld be added when copying the corresponding fields from IS-IS protocol
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US" style=3D"color:#1F497D">[K=
T] Now about for Length, we say for Adj-SID &amp; Prefix-SID =E2=80=93 =E2=80=
=9CVariable, 7 or 8 depending on Label or Index encoding of the SID=E2=80=9D=
 and for LAN-Adj-SID we say =E2=80=9CVariable. For ISIS it would be 13
 or 14 depending on Label or Index encoding of the SID. For OSPF it would be=
 11 or 12 depending on Label or Index encoding of the SID.=E2=80=9D<o:p></o:=
p></span></i></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&nb=
sp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:=
#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c) Regarding the definition =E2=80=9CRange TLV=E2=
=80=9D:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:=
#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if the =E2=80=9CLength=E2=80=
=9D filed is 4, how to detect the existence of =E2=80=9Csub-TLV?=E2=80=9D
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US" style=3D"color:#1F497D">[K=
T] You are right. The length should be variable since we have sub-TLVs and a=
lso the Prefix SID sub-TLV SHOULD be present to indicate the first label of t=
he Range. I will correct this.<o:p></o:p></span></i></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&nb=
sp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:=
#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Is it more clear to ren=
ame the =E2=80=9CRange TLV=E2=80=9D as =E2=80=9CMapping-Range TLV=E2=80=9D, s=
o as to distinguish it from the previous =E2=80=9CRange filed=E2=80=9D in &n=
bsp;=E2=80=9C2.1.2 SR-Capabilities TLV=E2=80=9D?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US" style=3D"color:#1F497D">[K=
T] I am not sure if we should make this name change at this stage. I don=E2=80=
=99t see the confusion between the two TLVs. However, if there is WG consens=
us to make this change then I would do so.<o:p></o:p></span></i></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&nb=
sp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:=
#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; d) Regarding &nbsp;the contents for =E2=80=9C3. Proc=
edures=E2=80=9D:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color:=
#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Suggest to delete this section, be=
cause:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:42.0pt"><span lang=3D"EN-US" sty=
le=3D"font-size:10.5pt;color:#1F497D">-------Contents in section 3.1, 3.2 ha=
s been mentioned in corresponding TLV definition(section 2.3.1), there is no=
 more new information in this section.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US" style=3D"color:#1F497D">[K=
T] OK will do.<o:p></o:p></span></i></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&nb=
sp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:42.0pt"><span lang=3D"EN-US" sty=
le=3D"font-size:10.5pt;color:#1F497D">-------Contents in &nbsp;section 3.3 a=
nd 3.4 should be merged with section 2.3.4 to eliminate the inconsistence ar=
ose in future when update parts of them.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US" style=3D"color:#1F497D">[K=
T] Sure, I will update it in that way too since it will be all info in one p=
lace for the reader.</span></i></b><span lang=3D"EN-US" style=3D"color:#1F49=
7D"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" sty=
le=3D"font-size:10.5pt;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 level=
1 lfo2"><!--[if !supportLists]--><span lang=3D"EN-US"><span style=3D"mso-lis=
t:Ignore">3)<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nb=
sp;&nbsp;&nbsp;
</span></span></span><!--[endif]--><span lang=3D"EN-US">Is this draft is rea=
dy for publication?
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span lang=3D"EN-US" sty=
le=3D"font-size:10.5pt;color:#1F497D">If the above issued is solved, it is r=
eady for publication.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">For your quick access to this dr=
aft, click on the link below:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://datatracker.i=
etf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-ext/">https://datatracker.=
ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-ext/</a><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Susan Hares<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>


</div></blockquote></div></body></html>=

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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : BGP Link-State extensions for Segment Routing
        Authors         : Stefano Previdi
                          Ketan Talaulikar
                          Clarence Filsfils
                          Hannes Gredler
                          Mach(Guoyi) Chen
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-ext-06.txt
	Pages           : 26
	Date            : 2018-04-11

Abstract:
   Segment Routing (SR) allows for a flexible definition of end-to-end
   paths by encoding paths as sequences of topological sub-paths, called
   "segments".  These segments are advertised by routing protocols e.g.
   by the link state routing protocols (IS-IS, OSPFv2 and OSPFv3) within
   IGP topologies.

   This draft defines extensions to the BGP Link-state address-family in
   order to carry segment routing information via BGP.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-ext/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-ext-06
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing-ext-06

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-bgp-ls-segment-routing-ext-06


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

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


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Aijun Wang <wangaijun@tsinghua.org.cn>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Krishna Muddenahally Ananthamurthy (kriswamy)" <kriswamy@cisco.com>, "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>, "idr@ietf.org" <idr@ietf.org>
CC: "lsvr@ietf.org" <lsvr@ietf.org>, "draft-keyupate-lsvr-bgp-spf@ietf.org" <draft-keyupate-lsvr-bgp-spf@ietf.org>
Thread-Topic: [Idr] FW: Requested: Volunteers to review draft-keyupate-lsvr-bgp-spf-00
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Date: Wed, 11 Apr 2018 14:56:56 +0000
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From nobody Wed Apr 11 10:03:05 2018
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Subject: [Idr] I-D Action: draft-ietf-idr-rs-bfd-05.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Making Route Servers Aware of Data Link Failures at IXPs
        Authors         : Randy Bush
                          Jeffrey Haas
                          John G. Scudder
                          Arnold Nipper
                          Christoph Dietzel
	Filename        : draft-ietf-idr-rs-bfd-05.txt
	Pages           : 14
	Date            : 2018-04-11

Abstract:
   When BGP route servers are used, the data plane is not congruent with
   the control plane.  Therefore, peers at an Internet exchange can lose
   data connectivity without the control plane being aware of it, and
   packets are lost.  This document proposes the use of a newly defined
   BGP Subsequent Address Family Identifier (SAFI) both to allow the
   route server to request its clients use BFD to track data plane
   connectivity to their peers' addresses, and for the clients to signal
   that connectivity state back to the route server.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-rs-bfd/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-rs-bfd-05
https://datatracker.ietf.org/doc/html/draft-ietf-idr-rs-bfd-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-rs-bfd-05


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

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ftp://ftp.ietf.org/internet-drafts/


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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/98bHetB54x-0Dg37RKQ-GD4Ifbo>
Subject: [Idr] Requesting WGLC for draft-ietf-idr-rs-bfd-05
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X-List-Received-Date: Wed, 11 Apr 2018 17:08:26 -0000

(as a co-author)

Hi All,

With the revision just published, the authors feel =
draft-ietf-idr-rs-bfd-05 is ready for working group last call.

Thanks,

--John

P.S.: =46rom the changelog in Appendix A:

   idr-04 to idr-05:  Added reference to "BGP Bestpath Selection
     Criteria Enhancement" draft.  Rename "next hop" field of NLRI to
     "Indirect Peer's Address".  Add suggestion about AS_PATH length
     checks.



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Date: Wed, 11 Apr 2018 17:36:02 +0000
From: Job Snijders <job@instituut.net>
To: John Scudder <jgs@juniper.net>
Cc: "idr@ietf. org" <idr@ietf.org>, idr-chairs@ietf.org
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Subject: Re: [Idr] Requesting WGLC for draft-ietf-idr-rs-bfd-05
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Dear John, working group,

On Wed, Apr 11, 2018 at 01:08:07PM -0400, John Scudder wrote:
> With the revision just published, the authors feel
> draft-ietf-idr-rs-bfd-05 is ready for working group last call.

Before proceeding to WGLC, I'd personally love to see implementation
reports: the draft-ietf-idr-rs-bfd implementations link at
https://trac.ietf.org/trac/idr/wiki/Protocol%20implementations%20Reports
points to a rather empty page.

Perhaps the authors could also consider adding a BCP 205 section to the
draft to raise awareness of running code.

Kind regards,

Job

ps. yes, i know IDR can have WGLC without running code, but given that
this is a non-trivial extension to BGP; I'd really like to see multiple
implementations that are able to interact with each other in the correct
way and a report detailing the interopability.


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From: "Susan Hares" <shares@ndzh.com>
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Subject: Re: [Idr] Requesting WGLC for draft-ietf-idr-rs-bfd-05
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John: 

I'll start the WG LC later this evening. 

Cheerily, 

Susan Hares 

-----Original Message-----
From: John Scudder [mailto:jgs@juniper.net] 
Sent: Wednesday, April 11, 2018 1:08 PM
To: idr@ietf. org
Cc: idr-chairs@ietf.org
Subject: Requesting WGLC for draft-ietf-idr-rs-bfd-05

(as a co-author)

Hi All,

With the revision just published, the authors feel draft-ietf-idr-rs-bfd-05
is ready for working group last call.

Thanks,

--John

P.S.: From the changelog in Appendix A:

   idr-04 to idr-05:  Added reference to "BGP Bestpath Selection
     Criteria Enhancement" draft.  Rename "next hop" field of NLRI to
     "Indirect Peer's Address".  Add suggestion about AS_PATH length
     checks.




From nobody Wed Apr 11 20:20:34 2018
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Hi, Acee:

=20

I prefer to strip the ambiguous definition of =E2=80=9C2.3.3.  Source =
Router Identifier (Source Router-ID) TLV=E2=80=9D from the current =
draft. The reasons are the followings:

1)       It has no relation to the SR technology.

2)       The main use case for this TLV that defined in RFC7794 is for =
the IS-IS redistribute between different levels

3)       There is no semantic description for the OSPF protocol(although =
it say =E2=80=9D The Source Router-ID TLV may be used to carry the OSPF =
Router-ID of the prefix originator.=E2=80=9D)

4)       As you have pointed out, the =E2=80=9Clocal node =
descriptors=E2=80=9D associated with =E2=80=9Cprefix =
descriptors=E2=80=9D can be used to identify the IGP router advertising =
the prefix, is this overlap with the =E2=80=9C2.3.3.  Source Router =
Identifier (Source Router-ID) TLV=E2=80=9D definition(as the LC document =
states: =E2=80=9CThe Source Router-ID TLV contains the IPv4 or IPv6 =
Router-ID of the  originator of the Prefix.  For IS-IS protocol this is =
as defined in  [RFC7794].  The Source Router-ID TLV may be used to carry =
the OSPF  Router-ID of the prefix originator.=E2=80=9D)?

=20

For inter-as scenarios, the process to get the inter-as topology is =
similar no matter whether there is BGP between those ASes or not, =
although normally the BGP will run between different AS. =20

=20

=20

Best Regards.

=20

Aijun Wang

Network R&D and Operation Support Department

China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:acee@cisco.com]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B44=E6=9C=8811=E6=97=A5 =
20:04
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; Ketan Talaulikar (ketant)
=E6=8A=84=E9=80=81: idr wg; Susan Hares
=E4=B8=BB=E9=A2=98: Re: [Idr] =E7=AD=94=E5=A4=8D: WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March 21)

=20

Hi Aijun, Sue,=20

=20

As you fully know, I don=E2=80=99t agree that you need to even use the =
Source Router-ID TLV for your use case as the Local Node Descriptors =
identify the IGP router advertising the prefix in the IGP domain. =
Furthermore, your use case is somewhat limited to the topology in figure =
1 of your draft where you have a controller with visibility of multiple =
ASes but there is no BGP between those ASes.=20

=20

Thanks,
Acee

=20

From: Idr <idr-bounces@ietf.org> on behalf of Aijun Wang =
<wangaijun@tsinghua.org.cn>
Date: Wednesday, April 11, 2018 at 7:35 AM
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
Cc: IDR List <idr@ietf.org>, Susan Hares <shares@ndzh.com>
Subject: Re: [Idr] =E7=AD=94=E5=A4=8D: WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March 21)

=20

Hi, Ketan:=20

I think the revised version is more clear.

=20

Regarding the Source Router Identifier (Source Router-ID) TLV=E2=80=9D, =
I think stripped it from the current draft did not influence the =
implementation on the device. We just reorganize the reference for this =
TLV, put it into the most suitable document for BGP-LS extension.

This TLV is more relevant to the Inter-AS situation and should be =
extended to cover all IGP scenarios, not just for ISIS in current =
document.

If possible, I can invite the author of this draft to be the co-authors =
of the BGP-LS inter-as extension draft.

=20

Except this point, I fully agree with you the updates.

=20

=20


=E5=9C=A8 2018=E5=B9=B44=E6=9C=8811=E6=97=A5=EF=BC=8C17:59=EF=BC=8CKetan =
Talaulikar (ketant) < <mailto:ketant@cisco.com> ketant@cisco.com> =
=E5=86=99=E9=81=93=EF=BC=9A

Hi Aijun,

=20

Please check inline below in your email for responses. Do let me know if =
this addresses your comments and I will post the updates accordingly.

=20

Thanks,

Ketan

=20

From: Idr < <mailto:idr-bounces@ietf.org> idr-bounces@ietf.org> On =
Behalf Of Aijun Wang
Sent: 11 April 2018 08:50
To: 'Susan Hares' < <mailto:shares@ndzh.com> shares@ndzh.com>; 'idr wg' =
< <mailto:idr@ietf.org> idr@ietf.org>
Subject: [Idr] =E7=AD=94=E5=A4=8D: WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March 21)

=20

Hi, Susan and Authors of this draft:

=20

Sorry to reply this LC so late.  The followings are my suggestions to =
this draft based on the discussion related to the mail thread  =
<https://mailarchive.ietf.org/arch/msg/idr/vSeflAMCMPL25N4nBOZu8yG19HA> =
https://mailarchive.ietf.org/arch/msg/idr/vSeflAMCMPL25N4nBOZu8yG19HA

Is it too late to response?  Please see the reply below in line.

=20

Best Regards.

=20

Aijun Wang

Network R&D and Operation Support Department

China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: Susan Hares [ <mailto:shares@ndzh.com> =
mailto:shares@ndzh.com]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B43=E6=9C=888=E6=97=A5 =
0:41
=E6=94=B6=E4=BB=B6=E4=BA=BA: 'idr wg'
=E4=B8=BB=E9=A2=98: [Idr] WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March 21)

=20

This begins a 2 week WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04.txt from March 7th to March =
21.  During your discussion in the WG LC, please indicate the following =
things:=20

=20

1)      Do you think BGP should carry these link state information =
regarding segment routing,=20

=E2=80=9CSource Router Identifier (Source Router-ID) TLV=E2=80=9D should =
be stripped off this draft, because there are other situations(more =
general scenarios besides SR) that requires the source router of the =
prefixes, as described in  =
<https://datatracker.ietf.org/doc/draft-wang-idr-bgpls-inter-as-topology-=
ext/> =
https://datatracker.ietf.org/doc/draft-wang-idr-bgpls-inter-as-topology-e=
xt/ and discussed in mail thread  =
<https://mailarchive.ietf.org/arch/msg/idr/-T7U1yg8DmSdDmtyfqBgtnkO4I0> =
https://mailarchive.ietf.org/arch/msg/idr/-T7U1yg8DmSdDmtyfqBgtnkO4I0

[KT] You are right that Source Router-ID TLV is not SR specific. SR was =
one of the key use-cases where this was felt this was necessary =
especially in ISIS (see rfc7794). The authors of the BGP-LS SR draft =
felt it was necessary to introduce and cover it as part of this draft =
given the use-cases. It has been part of this draft since many years and =
even before it was adopted by the WG. It has implementations and =
deployments. I would say you are too late in bringing forward such a =
comment at this stage. With regards to the inter-AS draft, you have seen =
the responses on the WG mailer as well as at London and I do not have =
anything further to add.

2)      Are there any technical issues with this draft?=20

=20

Some clarifications should be added in the following sections:

a) Regarding the usage of SID/Label sub-TLV:

=E2=80=9C2.1.2 SR-Capabilities TLV=E2=80=9D, =E2=80=9C2.1.4 SR Local =
Block TLV=E2=80=9D requires all the presence of =E2=80=9CSID/Label =
sub-TLV=E2=80=9D.  It is more clear to indicate  this =E2=80=9CSID/Label =
sub-TLV=E2=80=9D represent the base of the =E2=80=9CRange Size=E2=80=9D. =


[KT] How about instead of =E2=80=9CSID/Label sub-TLV (as defined in =
Section 2.1.1).=E2=80=9D we change it to =E2=80=9CSID/Label sub-TLV (as =
defined in Section 2.1.1) which encodes the first label in the =
range.=E2=80=9D? Would this help clarify?

=20

b) Regarding the inconsistence definition among =
=E2=80=9CISIS/OSPF/OSPFv3/BGP-LS=E2=80=9D :

    =E2=80=9C2.2.1 Adjacency SID=E2=80=9D, =E2=80=9C2.2.2 LAN Adjacency =
SID TLV=E2=80=9D,=E2=80=9D2..3.1 Prefix-SID TLV=E2=80=9D

Note for =E2=80=9CLength=E2=80=9D field:   2-bytes =
=E2=80=9CReserved=E2=80=9D filed should be added when copying the =
corresponding fields from IS-IS protocol=20

[KT] Now about for Length, we say for Adj-SID & Prefix-SID =E2=80=93 =
=E2=80=9CVariable, 7 or 8 depending on Label or Index encoding of the =
SID=E2=80=9D and for LAN-Adj-SID we say =E2=80=9CVariable. For ISIS it =
would be 13 or 14 depending on Label or Index encoding of the SID. For =
OSPF it would be 11 or 12 depending on Label or Index encoding of the =
SID.=E2=80=9D

=20

                c) Regarding the definition =E2=80=9CRange TLV=E2=80=9D:

                    if the =E2=80=9CLength=E2=80=9D filed is 4, how to =
detect the existence of =E2=80=9Csub-TLV?=E2=80=9D=20

[KT] You are right. The length should be variable since we have sub-TLVs =
and also the Prefix SID sub-TLV SHOULD be present to indicate the first =
label of the Range. I will correct this.

=20

                    Is it more clear to rename the =E2=80=9CRange =
TLV=E2=80=9D as =E2=80=9CMapping-Range TLV=E2=80=9D, so as to =
distinguish it from the previous =E2=80=9CRange filed=E2=80=9D in  =
=E2=80=9C2.1.2 SR-Capabilities TLV=E2=80=9D?

[KT] I am not sure if we should make this name change at this stage. I =
don=E2=80=99t see the confusion between the two TLVs. However, if there =
is WG consensus to make this change then I would do so.

=20

                d) Regarding  the contents for =E2=80=9C3. =
Procedures=E2=80=9D:

                   Suggest to delete this section, because:

-------Contents in section 3.1, 3.2 has been mentioned in corresponding =
TLV definition(section 2.3.1), there is no more new information in this =
section.

[KT] OK will do.

=20

-------Contents in  section 3.3 and 3.4 should be merged with section =
2.3.4 to eliminate the inconsistence arose in future when update parts =
of them.

[KT] Sure, I will update it in that way too since it will be all info in =
one place for the reader.

=20

3)      Is this draft is ready for publication?=20

If the above issued is solved, it is ready for publication.

=20

For your quick access to this draft, click on the link below:=20

=20

 =
<https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-e=
xt/> =
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-ex=
t/

=20

=20

Susan Hares

=20


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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Hi, =
Acee:<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>I prefer to strip the ambiguous =
definition of =E2=80=9C2.3.3.=C2=A0 Source Router Identifier (Source =
Router-ID) TLV=E2=80=9D from the current draft. The reasons are the =
followings:<o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 =
lfo1'><![if !supportLists]><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><span =
style=3D'mso-list:Ignore'>1)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>It has no relation to the SR =
technology.<o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 =
lfo1'><![if !supportLists]><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><span =
style=3D'mso-list:Ignore'>2)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>The main use case for this TLV =
that defined in RFC7794 is for the IS-IS redistribute between different =
levels<o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 =
lfo1'><![if !supportLists]><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><span =
style=3D'mso-list:Ignore'>3)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>There is no semantic =
description for the OSPF protocol(although it say =E2=80=9D</span><span =
lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>The Source Router-ID TLV may be =
used to carry the OSPF Router-ID of the prefix =
originator.=E2=80=9D)<o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 =
lfo1'><![if !supportLists]><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><span =
style=3D'mso-list:Ignore'>4)<span style=3D'font:7.0pt "Times New =
Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
</span></span></span><![endif]><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>As you have pointed out, the =
=E2=80=9Clocal node descriptors=E2=80=9D associated with =E2=80=9Cprefix =
descriptors=E2=80=9D can be used to identify the IGP router advertising =
the prefix, is this overlap with the =E2=80=9C2.3.3.=C2=A0 Source Router =
Identifier (Source Router-ID) TLV=E2=80=9D definition(as the LC document =
states: =E2=80=9CThe Source Router-ID TLV contains the IPv4 or IPv6 =
Router-ID of the=C2=A0 originator of the Prefix.=C2=A0 For IS-IS =
protocol this is as defined in=C2=A0 [RFC7794].=C2=A0 The Source =
Router-ID TLV may be used to carry the OSPF=C2=A0 Router-ID of the =
prefix originator.=E2=80=9D)?<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>For inter-as scenarios, the =
process to get the inter-as topology is similar no matter whether there =
is BGP between those ASes or not, although normally the BGP will run =
between different AS. =C2=A0<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Network R&amp;D =
and Operation Support Department<o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>China Telecom =
Corporation Limited Beijing Research Institute,Beijing, =
China.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><div=
><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0cm 0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E4=BB=
=B6=E4=BA=BA<span lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> Acee Lindem =
(acee) [mailto:acee@cisco.com] <br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E9=80=
=81=E6=97=B6=E9=97=B4<span lang=3DEN-US>:</span></span></b><span =
lang=3DEN-US style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> =
2018</span><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4<span =
lang=3DEN-US>4</span>=E6=9C=88<span lang=3DEN-US>11</span>=E6=97=A5<span =
lang=3DEN-US> 20:04<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun Wang; Ketan =
Talaulikar (ketant)<br></span><b>=E6=8A=84=E9=80=81<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> idr wg; Susan =
Hares<br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [Idr] =
</span>=E7=AD=94=E5=A4=8D<span lang=3DEN-US>: WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March =
21)<o:p></o:p></span></span></p></div></div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:16.0pt'>Hi Aijun, Sue, =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:16.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'font-size:16.0pt'>As you =
fully know, I don=E2=80=99t agree that you need to even use the Source =
Router-ID TLV for your use case as the Local Node Descriptors identify =
the IGP router advertising the prefix in the IGP domain. Furthermore, =
your use case is somewhat limited to the topology in figure 1 of your =
draft where you have a controller with visibility of multiple ASes but =
there is no BGP between those ASes. <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:16.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:16.0pt'>Thanks,<br>Acee<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:16.0pt'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal style=3D'margin-left:36.0pt'><b><span =
lang=3DEN-US style=3D'font-size:12.0pt;color:black'>From: =
</span></b><span lang=3DEN-US style=3D'font-size:12.0pt;color:black'>Idr =
&lt;<a href=3D"mailto:idr-bounces@ietf.org">idr-bounces@ietf.org</a>&gt; =
on behalf of Aijun Wang &lt;<a =
href=3D"mailto:wangaijun@tsinghua.org.cn">wangaijun@tsinghua.org.cn</a>&g=
t;<br><b>Date: </b>Wednesday, April 11, 2018 at 7:35 AM<br><b>To: =
</b>&quot;Ketan Talaulikar (ketant)&quot; &lt;<a =
href=3D"mailto:ketant@cisco.com">ketant@cisco.com</a>&gt;<br><b>Cc: =
</b>IDR List &lt;<a href=3D"mailto:idr@ietf.org">idr@ietf.org</a>&gt;, =
Susan Hares &lt;<a =
href=3D"mailto:shares@ndzh.com">shares@ndzh.com</a>&gt;<br><b>Subject: =
</b>Re: [Idr] </span><span style=3D'font-size:12.0pt;font-family:"MS =
Gothic";color:black'>=E7=AD=94=E5=A4=8D</span><span lang=3DEN-US =
style=3D'font-size:12.0pt;color:black'>: WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March =
21)<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><a name=3D"_MailOriginalBody"><span =
lang=3DEN-US>Hi, Ketan: <o:p></o:p></span></a></p><div><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span lang=3DEN-US>I =
think the revised version is more =
clear.<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US>Regarding =
the&nbsp;<b>Source Router Identifier (Source Router-ID) =
TLV=E2=80=9D,&nbsp;</b>I think stripped it from the current draft did =
not influence the implementation on the device. We just reorganize the =
reference for this TLV, put it into the most suitable document for =
BGP-LS extension.<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US>This TLV is more =
relevant to the Inter-AS situation and should be extended to cover all =
IGP scenarios, not just for ISIS in current =
document.<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US>If possible, I can =
invite the author of this draft to be the co-authors of the BGP-LS =
inter-as extension draft.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US>Except this point, I =
fully agree with you the updates.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><div><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;mar=
gin-left:36.0pt'><span lang=3DEN-US><br></span><span =
style=3D'font-family:"MS Gothic"'>=E5=9C=A8</span><span lang=3DEN-US> =
2018</span><span style=3D'font-family:"MS Gothic"'>=E5=B9=B4</span><span =
lang=3DEN-US>4</span><span style=3D'font-family:"MS =
Gothic"'>=E6=9C=88</span><span lang=3DEN-US>11</span><span =
style=3D'font-family:"MS Gothic"'>=E6=97=A5=EF=BC=8C</span><span =
lang=3DEN-US>17:59</span><span style=3D'font-family:"MS =
Gothic"'>=EF=BC=8C</span><span lang=3DEN-US>Ketan Talaulikar (ketant) =
&lt;</span><a href=3D"mailto:ketant@cisco.com"><span =
lang=3DEN-US>ketant@cisco.com</span></a><span lang=3DEN-US>&gt; =
</span><span style=3D'font-family:"MS =
Gothic"'>=E5=86=99=E9=81=93=EF=BC=9A</span><span =
lang=3DEN-US><o:p></o:p></span></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>Hi Aijun,</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>Please check inline below in your email for =
responses. Do let me know if this addresses your comments and I will =
post the updates accordingly.</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>Thanks,</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>Ketan</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal style=3D'margin-left:36.0pt'><b><span =
lang=3DEN-US>From:</span></b><span lang=3DEN-US> Idr &lt;</span><a =
href=3D"mailto:idr-bounces@ietf.org"><span =
lang=3DEN-US>idr-bounces@ietf.org</span></a><span lang=3DEN-US>&gt; =
<b>On Behalf Of </b>Aijun Wang<br><b>Sent:</b> 11 April 2018 =
08:50<br><b>To:</b> 'Susan Hares' &lt;</span><a =
href=3D"mailto:shares@ndzh.com"><span =
lang=3DEN-US>shares@ndzh.com</span></a><span lang=3DEN-US>&gt;; 'idr wg' =
&lt;</span><a href=3D"mailto:idr@ietf.org"><span =
lang=3DEN-US>idr@ietf.org</span></a><span =
lang=3DEN-US>&gt;<br><b>Subject:</b> [Idr] </span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E7=AD=94=E5=A4=8D</span><span =
lang=3DEN-US>: WG LC for draft-ietf-idr-bgp-ls-segment-routing-ext-04 =
(March 7 to March 21)<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Hi, Susan and Authors of this =
draft:</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Sorry to reply this LC so =
late.&nbsp; The followings are my suggestions to this draft based on the =
discussion related to the mail thread </span><a =
href=3D"https://mailarchive.ietf.org/arch/msg/idr/vSeflAMCMPL25N4nBOZu8yG=
19HA"><span lang=3DEN-US =
style=3D'font-size:10.5pt'>https://mailarchive.ietf.org/arch/msg/idr/vSef=
lAMCMPL25N4nBOZu8yG19HA</span></a><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Is it too late to =
response?&nbsp; Please see the reply below in line.</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt;text-align:justify;text-justify:inter-ideogra=
ph'><span lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Best =
Regards.</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'margin-left:36.0pt;text-align:justify;text-justify:inter-ideogra=
ph'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt;text-align:justify;text-justify:inter-ideogra=
ph'><span lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Aijun =
Wang</span><span lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt;text-align:justify;text-justify:inter-ideogra=
ph'><span lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Network =
R&amp;D and Operation Support Department</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt;text-align:justify;text-justify:inter-ideogra=
ph'><span lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>China =
Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal style=3D'margin-left:36.0pt'><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E4=BB=
=B6=E4=BA=BA<span lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> Susan Hares =
[</span><a href=3D"mailto:shares@ndzh.com"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>mailto:shares@n=
dzh.com</span></a><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>] =
<br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E9=80=
=81=E6=97=B6=E9=97=B4<span lang=3DEN-US>:</span></span></b><span =
lang=3DEN-US style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> =
2018</span><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4<span =
lang=3DEN-US>3</span>=E6=9C=88<span lang=3DEN-US>8</span>=E6=97=A5<span =
lang=3DEN-US> 0:41<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> 'idr =
wg'<br></span><b>=E4=B8=BB=E9=A2=98<span lang=3DEN-US>:</span></b><span =
lang=3DEN-US> [Idr] WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March =
21)</span></span><span lang=3DEN-US><o:p></o:p></span></p></div></div><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US>This begins a 2 week WG =
LC for draft-ietf-idr-bgp-ls-segment-routing-ext-04.txt from March =
7<sup>th</sup> to March 21.&nbsp; During your discussion in the WG LC, =
please indicate the following things: <o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:72.0pt;text-indent:-18.0pt'><span =
lang=3DEN-US>1)</span><span lang=3DEN-US =
style=3D'font-size:7.0pt;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
lang=3DEN-US>Do you think BGP should carry these link state information =
regarding segment routing, <o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:3=
6.0pt;text-indent:35.15pt;mso-line-height-alt:0pt'><b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:black'>=E2=80=9CSource Router Identifier (Source Router-ID) =
TLV=E2=80=9D </span></b><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>should be stripped off this =
draft, because there are other situations(more general scenarios besides =
SR) that requires the source router of the prefixes, as described in =
</span><a =
href=3D"https://datatracker.ietf.org/doc/draft-wang-idr-bgpls-inter-as-to=
pology-ext/"><span lang=3DEN-US =
style=3D'font-size:10.5pt'>https://datatracker.ietf.org/doc/draft-wang-id=
r-bgpls-inter-as-topology-ext/</span></a><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'> and discussed in mail thread =
</span><a =
href=3D"https://mailarchive.ietf.org/arch/msg/idr/-T7U1yg8DmSdDmtyfqBgtnk=
O4I0"><span lang=3DEN-US =
style=3D'font-size:10.5pt'>https://mailarchive.ietf.org/arch/msg/idr/-T7U=
1yg8DmSdDmtyfqBgtnkO4I0</span></a><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:3=
6.0pt;mso-line-height-alt:0pt'><b><i><span lang=3DEN-US =
style=3D'color:#1F497D'>[KT] You are right that Source Router-ID TLV is =
not SR specific. SR was one of the key use-cases where this was felt =
this was necessary especially in ISIS (see rfc7794). The authors of the =
BGP-LS SR draft felt it was necessary to introduce and cover it as part =
of this draft given the use-cases. It has been part of this draft since =
many years and even before it was adopted by the WG. It has =
implementations and deployments. I would say you are too late in =
bringing forward such a comment at this stage. With regards to the =
inter-AS draft, you have seen the responses on the WG mailer as well as =
at London and I do not have anything further to add.</span></i></b><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:72.0pt;text-indent:-18.0pt'><span =
lang=3DEN-US>2)</span><span lang=3DEN-US =
style=3D'font-size:7.0pt;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
lang=3DEN-US>Are there any technical issues with this draft? =
<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Some clarifications should be =
added in the following sections:</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>a) Regarding the usage of =
SID/Label sub-TLV:</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt;text-indent:47.25pt'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>=E2=80=9C2.1.2 =
SR-Capabilities TLV=E2=80=9D, =E2=80=9C2.1.4 SR Local Block TLV=E2=80=9D =
requires all the presence of =E2=80=9CSID/Label sub-TLV=E2=80=9D. =
&nbsp;It is more clear to indicate &nbsp;this =E2=80=9CSID/Label =
sub-TLV=E2=80=9D represent the base of the =E2=80=9CRange Size=E2=80=9D. =
</span><span lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><b><i><span lang=3DEN-US =
style=3D'color:#1F497D'>[KT] How about instead of =E2=80=9CSID/Label =
sub-TLV (as defined in Section 2.1.1).=E2=80=9D we change it to =
=E2=80=9CSID/Label sub-TLV (as defined in Section 2.1.1) which encodes =
the first label in the range.=E2=80=9D? Would this help =
clarify?</span></i></b><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>b) Regarding the inconsistence =
definition among =E2=80=9CISIS/OSPF/OSPFv3/BGP-LS=E2=80=9D :</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp; =
=E2=80=9C2.2.1 Adjacency SID=E2=80=9D, =E2=80=9C2.2.2 LAN Adjacency SID =
TLV=E2=80=9D,=E2=80=9D2..3.1 Prefix-SID TLV=E2=80=9D</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt;text-indent:9.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Note for =
=E2=80=9CLength=E2=80=9D field: &nbsp;&nbsp;2-bytes =
=E2=80=9CReserved=E2=80=9D filed should be added when copying the =
corresponding fields from IS-IS protocol </span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><b><i><span lang=3DEN-US =
style=3D'color:#1F497D'>[KT] Now about for Length, we say for Adj-SID =
&amp; Prefix-SID =E2=80=93 =E2=80=9CVariable, 7 or 8 depending on Label =
or Index encoding of the SID=E2=80=9D and for LAN-Adj-SID we say =
=E2=80=9CVariable. For ISIS it would be 13 or 14 depending on Label or =
Index encoding of the SID. For OSPF it would be 11 or 12 depending on =
Label or Index encoding of the SID.=E2=80=9D</span></i></b><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c) =
Regarding the definition =E2=80=9CRange TLV=E2=80=9D:</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; if the =E2=80=9CLength=E2=80=9D filed is 4, how to detect the =
existence of =E2=80=9Csub-TLV?=E2=80=9D </span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><b><i><span lang=3DEN-US =
style=3D'color:#1F497D'>[KT] You are right. The length should be =
variable since we have sub-TLVs and also the Prefix SID sub-TLV SHOULD =
be present to indicate the first label of the Range. I will correct =
this.</span></i></b><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;Is it more clear to rename the =E2=80=9CRange =
TLV=E2=80=9D as =E2=80=9CMapping-Range TLV=E2=80=9D, so as to =
distinguish it from the previous =E2=80=9CRange filed=E2=80=9D in =
&nbsp;=E2=80=9C2.1.2 SR-Capabilities TLV=E2=80=9D?</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><b><i><span lang=3DEN-US =
style=3D'color:#1F497D'>[KT] I am not sure if we should make this name =
change at this stage. I don=E2=80=99t see the confusion between the two =
TLVs. However, if there is WG consensus to make this change then I would =
do so.</span></i></b><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d) Regarding =
&nbsp;the contents for =E2=80=9C3. Procedures=E2=80=9D:</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; Suggest to delete this section, because:</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt;text-indent:42.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>-------Contents in section 3.1, =
3.2 has been mentioned in corresponding TLV definition(section 2.3.1), =
there is no more new information in this section.</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><b><i><span lang=3DEN-US =
style=3D'color:#1F497D'>[KT] OK will do.</span></i></b><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt;text-indent:42.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>-------Contents in =
&nbsp;section 3.3 and 3.4 should be merged with section 2.3.4 to =
eliminate the inconsistence arose in future when update parts of =
them.</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><b><i><span lang=3DEN-US =
style=3D'color:#1F497D'>[KT] Sure, I will update it in that way too =
since it will be all info in one place for the =
reader.</span></i></b><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:72.0pt;text-indent:-18.0pt'><span =
lang=3DEN-US>3)</span><span lang=3DEN-US =
style=3D'font-size:7.0pt;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
lang=3DEN-US>Is this draft is ready for publication? =
<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>If the above issued is solved, =
it is ready for publication.</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US>For your quick access to =
this draft, click on the link below: <o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><a =
href=3D"https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-ro=
uting-ext/"><span =
lang=3DEN-US>https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segme=
nt-routing-ext/</span></a><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US>Susan =
Hares<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p></div></blockquote></div></div></body>=
</html>
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To: "Acee Lindem (acee)" <acee@cisco.com>, "idr@ietf.org" <idr@ietf.org>
Cc: "draft-ietf-idr-bgpls-segment-routing-epe@ietf.org" <draft-ietf-idr-bgpls-segment-routing-epe@ietf.org>,  "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>,  "draft-ietf-ospf-link-overload@ietf.org" <draft-ietf-ospf-link-overload@ietf.org>
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Subject: Re: [Idr] Implementations of draft-ietf-idr-bgpls-segment-routing-epe (draft-ietf-ospf-link-overload)
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On April 6, 2018 at 6:05:52 PM, Acee Lindem (acee) (acee@cisco.com) wrote:

Acee:

Hi!

There are implementations and deployments -
https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-bgpls-segment-routing-ep=
e%20

Also, it looks to me that 1101 is assigned to Peer Node SID already -
https://www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#=
node-descriptor-link-descriptor-prefix-descriptor-attribute-tlv

Also, I do not see early allocation for the BGP-LS OSPF Link Overload TLV
although one is requested in the corresponding draft. Hence, I don=E2=80=99=
t see
what the problem is.

Let me try again.  In short, I=E2=80=99m trying to figure out how serious t=
he
problem is...

The early allocation for the BGP-LS OSPF Link Overload TLV was (mistakenly)
requested from the BGP-LS NLRI-Types registry [1] and a value of 1101 was
assigned.  As you know, that mistake was detected late in the process
(during IESG Evaluation!) and fixed in the -15 version
of draft-ietf-ospf-link-overload (-16 is the current one).

The BGP-LS Node Descriptor, Link Descriptor, Prefix Descriptor, and
Attribute TLVs registry [2] is the correct registry, and, as you point
above, the 1101 value there was assigned to the Peer Node SID
(draft-ietf-idr-bgpls-segment-routing-epe).

With this e-mail, and a similar one I sent to the lsr WG, I am trying to
figure out the impact (if any) to existing implementation from what could
be seen as overlapping assignments, and the actions we may need IANA to
take.  For example, if there were implementations of
draft-ietf-ospf-link-overload
*and* draft-ietf-idr-bgpls-segment-routing-epe with the same value (1101)
then we would have a significant problem.  However, the only answer in the
lsr list has been to point out that there are no known implementations
of draft-ietf-ospf-link-overload =E2=80=94 and, from this thread, there is
confirmation that implementations
of draft-ietf-idr-bgpls-segment-routing-epe exist.

This is probably the best result, and makes the registry cleanup easier.

Thanks!

Alvaro.

[1]
https://www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#=
nlri-types


[2]
https://www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#=
node-descriptor-link-descriptor-prefix-descriptor-attribute-tlv




Thanks,

Acee







From: Alvaro Retana <aretana.ietf@gmail.com>
Date: Friday, April 6, 2018 at 2:51 PM
To: IDR List <idr@ietf.org>
Cc: "draft-ietf-ospf-link-overload@ietf.org" <
draft-ietf-ospf-link-overload@ietf.org>, "
draft-ietf-idr-bgpls-segment-routing-epe@ietf.org" <
draft-ietf-idr-bgpls-segment-routing-epe@ietf.org>, "lsr-chairs@ietf.org" <
lsr-chairs@ietf.org>, Acee Lindem <acee@cisco.com>
Subject: Implementations of draft-ietf-idr-bgpls-segment-routing-epe
(draft-ietf-ospf-link-overload)



Dear idr WG:



draft-ietf-ospf-link-overload [1] defines a new BGP-LS
Graceful-Link-Shutdown TLV.  When an early allocation was requested, it was
mistakenly requested from the "BGP-LS NLRI-Types" registry [2], not from
the "BGP-LS Node Descriptor, Link Descriptor, Prefix Descriptor, and
Attribute TLVs=E2=80=9D registry [3].  IANA allocated a value according to =
the
request: 1101.



The mistake wasn't noticed until the document was in IESG Evaluation -- we
are in the process of correcting it.  However, the 1101 code point in the
"BGP-LS Node Descriptor, Link Descriptor, Prefix Descriptor, and Attribute
TLVs=E2=80=9D registry corresponds to the Peer-Node-SID, an early allocatio=
n made
to draft-ietf-idr-bgpls-segment-routing-epe [4], which says that "several
early implementations exist".



Are there implementations of draft-ietf-idr-bgpls-segment-routing-epe with
the 1101 code point?  Are there deployments of those implementations?



Thanks!



Alvaro.





[1] https://datatracker.ietf.org/doc/draft-ietf-ospf-link-overload/

[2]
https://www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#=
nlri-types


[3]
https://www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#=
node-descriptor-link-descriptor-prefix-descriptor-attribute-tlv


[4]
https://datatracker.ietf.org/doc/draft-ietf-idr-bgpls-segment-routing-epe/

--000000000000257e6c0569a694db
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style>=
</head><body style=3D"word-wrap:break-word"><div id=3D"bloop_customfont" st=
yle=3D"color:rgb(0,0,0);margin:0px"><font face=3D"Helvetica">On April 6, 20=
18 at 6:05:52 PM, Acee Lindem (acee) (<a href=3D"mailto:acee@cisco.com">ace=
e@cisco.com</a>) wrote:</font></div><div id=3D"bloop_customfont" style=3D"c=
olor:rgb(0,0,0);margin:0px"><font face=3D"Helvetica"><br></font></div><div =
id=3D"bloop_customfont" style=3D"color:rgb(0,0,0);margin:0px"><font face=3D=
"Helvetica">Acee:</font></div><div id=3D"bloop_customfont" style=3D"color:r=
gb(0,0,0);margin:0px"><br></div><div id=3D"bloop_customfont" style=3D"color=
:rgb(0,0,0);margin:0px">Hi!</div> <div><div><blockquote type=3D"cite" class=
=3D"clean_bq" style=3D"font-family:Helvetica,Arial;font-size:13px;font-styl=
e:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;=
text-align:start;text-indent:0px;text-transform:none;white-space:normal;wor=
d-spacing:0px"><span><div lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><fo=
nt face=3D"Helvetica"><div></div><div><div class=3D"WordSection1"><p class=
=3D"MsoNormal">There are implementations and deployments -<span class=3D"Ap=
ple-converted-space">=C2=A0</span><a href=3D"https://trac.ietf.org/trac/idr=
/wiki/draft-ietf-idr-bgpls-segment-routing-epe%20">https://trac.ietf.org/tr=
ac/idr/wiki/draft-ietf-idr-bgpls-segment-routing-epe%20</a></p><p class=3D"=
MsoNormal">Also, it looks to me that 1101 is assigned to Peer Node SID alre=
ady -<span class=3D"Apple-converted-space">=C2=A0</span><a href=3D"https://=
www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#node-des=
criptor-link-descriptor-prefix-descriptor-attribute-tlv">https://www.iana.o=
rg/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#node-descriptor-li=
nk-descriptor-prefix-descriptor-attribute-tlv</a></p><p class=3D"MsoNormal"=
>Also, I do not see early allocation for the BGP-LS OSPF Link Overload TLV =
although one is requested in the corresponding draft. Hence, I don=E2=80=99=
t see what the problem is.</p></div></div></font></div></span></blockquote>=
</div><p>Let me try again.=C2=A0 In short, I=E2=80=99m trying to figure out=
 how serious the problem is...</p><p>The early allocation for the=C2=A0BGP-=
LS OSPF Link Overload TLV was (mistakenly) requested from the=C2=A0BGP-LS N=
LRI-Types registry [1] and a value of 1101 was assigned.=C2=A0 As you know,=
 that mistake was detected late in the process (during IESG Evaluation!) an=
d fixed in the -15 version of=C2=A0draft-ietf-ospf-link-overload (-16 is th=
e current one).</p><p>The=C2=A0BGP-LS Node Descriptor, Link Descriptor, Pre=
fix Descriptor, and Attribute TLVs registry [2] is the correct registry, an=
d, as you point above, the 1101 value there was assigned to the Peer Node S=
ID (draft-ietf-idr-bgpls-segment-routing-epe).</p><p>With this e-mail, and =
a similar one I sent to the lsr WG, I am trying to figure out the impact (i=
f any) to existing implementation from what could be seen as overlapping as=
signments, and the actions we may need IANA to take.=C2=A0 For example, if =
there were implementations of draft-ietf-ospf-link-overload *and*=C2=A0draf=
t-ietf-idr-bgpls-segment-routing-epe with the same value (1101) then we wou=
ld have a significant problem.=C2=A0 However, the only answer in the lsr li=
st has been to point out that there are no known implementations of=C2=A0dr=
aft-ietf-ospf-link-overload =E2=80=94 and, from this thread, there is confi=
rmation that implementations of=C2=A0draft-ietf-idr-bgpls-segment-routing-e=
pe exist.</p><p>This is probably the best result, and makes the registry cl=
eanup easier.</p><p>Thanks!</p><p>Alvaro.</p><p>[1]=C2=A0<a href=3D"https:/=
/www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.xhtml#nlri-ty=
pes">https://www.iana.org/assignments/bgp-ls-parameters/bgp-ls-parameters.x=
html#nlri-types</a>=C2=A0</p><p>[2]=C2=A0<a href=3D"https://www.iana.org/as=
signments/bgp-ls-parameters/bgp-ls-parameters.xhtml#node-descriptor-link-de=
scriptor-prefix-descriptor-attribute-tlv">https://www.iana.org/assignments/=
bgp-ls-parameters/bgp-ls-parameters.xhtml#node-descriptor-link-descriptor-p=
refix-descriptor-attribute-tlv</a>=C2=A0</p></div><div><blockquote type=3D"=
cite" class=3D"clean_bq" style=3D"font-family:Helvetica,Arial;font-size:13p=
x;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spac=
ing:normal;text-align:start;text-indent:0px;text-transform:none;white-space=
:normal;word-spacing:0px"><span><div lang=3D"EN-US" link=3D"blue" vlink=3D"=
purple"><font face=3D"Helvetica"><div class=3D"WordSection1"><p class=3D"Ms=
oNormal"></p><p class=3D"MsoNormal">=C2=A0</p><p class=3D"MsoNormal">Thanks=
,</p><p class=3D"MsoNormal">Acee</p><p class=3D"MsoNormal">=C2=A0</p><p cla=
ss=3D"MsoNormal">=C2=A0</p><p class=3D"MsoNormal">=C2=A0</p><div style=3D"b=
order-style:solid none none;border-top-width:1pt;border-top-color:rgb(181,1=
96,223);padding:3pt 0in 0in"><p class=3D"MsoNormal" style=3D"margin-left:0.=
5in"><span style=3D"color:black">From:<span class=3D"Apple-converted-space"=
>=C2=A0</span></span><span style=3D"color:black">Alvaro Retana &lt;<a href=
=3D"mailto:aretana.ietf@gmail.com">aretana.ietf@gmail.com</a>&gt;<br>Date:<=
span class=3D"Apple-converted-space">=C2=A0</span>Friday, April 6, 2018 at =
2:51 PM<br>To:<span class=3D"Apple-converted-space">=C2=A0</span>IDR List &=
lt;<a href=3D"mailto:idr@ietf.org">idr@ietf.org</a>&gt;<br>Cc:<span class=
=3D"Apple-converted-space">=C2=A0</span>&quot;<a href=3D"mailto:draft-ietf-=
ospf-link-overload@ietf.org">draft-ietf-ospf-link-overload@ietf.org</a>&quo=
t; &lt;<a href=3D"mailto:draft-ietf-ospf-link-overload@ietf.org">draft-ietf=
-ospf-link-overload@ietf.org</a>&gt;, &quot;<a href=3D"mailto:draft-ietf-id=
r-bgpls-segment-routing-epe@ietf.org">draft-ietf-idr-bgpls-segment-routing-=
epe@ietf.org</a>&quot; &lt;<a href=3D"mailto:draft-ietf-idr-bgpls-segment-r=
outing-epe@ietf.org">draft-ietf-idr-bgpls-segment-routing-epe@ietf.org</a>&=
gt;, &quot;<a href=3D"mailto:lsr-chairs@ietf.org">lsr-chairs@ietf.org</a>&q=
uot; &lt;<a href=3D"mailto:lsr-chairs@ietf.org">lsr-chairs@ietf.org</a>&gt;=
, Acee Lindem &lt;<a href=3D"mailto:acee@cisco.com">acee@cisco.com</a>&gt;<=
br>Subject:<span class=3D"Apple-converted-space">=C2=A0</span>Implementatio=
ns of draft-ietf-idr-bgpls-segment-routing-epe (draft-ietf-ospf-link-overlo=
ad)</span></p></div><div><p class=3D"MsoNormal" style=3D"margin-left:0.5in"=
>=C2=A0</p></div><div id=3D"bloop_customfont"><div id=3D"bloop_customfont">=
<p class=3D"MsoNormal" style=3D"margin-left:0.5in"><a name=3D"_MailOriginal=
Body">Dear idr WG:</a></p></div><div id=3D"bloop_customfont"><p class=3D"Ms=
oNormal" style=3D"margin-left:0.5in"><span>=C2=A0</span></p></div><div id=
=3D"bloop_customfont"><p class=3D"MsoNormal" style=3D"margin-left:0.5in"><s=
pan>draft-ietf-ospf-link-overload [1] defines a new BGP-LS Graceful-Link-Sh=
utdown TLV.=C2=A0 When an early allocation was requested, it was mistakenly=
 requested from the &quot;BGP-LS NLRI-Types&quot; registry [2], not from th=
e &quot;BGP-LS Node Descriptor, Link Descriptor, Prefix Descriptor, and Att=
ribute TLVs=E2=80=9D registry [3].=C2=A0 IANA allocated a value according t=
o the request: 1101.</span></p></div><div id=3D"bloop_customfont"><p class=
=3D"MsoNormal" style=3D"margin-left:0.5in"><span>=C2=A0</span></p></div><di=
v id=3D"bloop_customfont"><p class=3D"MsoNormal" style=3D"margin-left:0.5in=
"><span>The mistake wasn&#39;t noticed until the document was in IESG Evalu=
ation -- we are in the process of correcting it.=C2=A0 However, the 1101 co=
de point in the &quot;BGP-LS Node Descriptor, Link Descriptor, Prefix Descr=
iptor, and Attribute TLVs=E2=80=9D registry corresponds to the Peer-Node-SI=
D, an early allocation made to draft-ietf-idr-bgpls-segment-routing-epe [4]=
, which says that &quot;several early implementations exist&quot;.</span></=
p></div><div id=3D"bloop_customfont"><p class=3D"MsoNormal" style=3D"margin=
-left:0.5in"><span>=C2=A0</span></p></div><div id=3D"bloop_customfont"><p c=
lass=3D"MsoNormal" style=3D"margin-left:0.5in"><span>Are there implementati=
ons of draft-ietf-idr-bgpls-segment-routing-epe with the 1101 code point?=
=C2=A0 Are there deployments of those implementations?</span></p></div><div=
 id=3D"bloop_customfont"><p class=3D"MsoNormal" style=3D"margin-left:0.5in"=
><span>=C2=A0</span></p></div><div id=3D"bloop_customfont"><p class=3D"MsoN=
ormal" style=3D"margin-left:0.5in"><span>Thanks!</span></p></div><div id=3D=
"bloop_customfont"><p class=3D"MsoNormal" style=3D"margin-left:0.5in"><span=
>=C2=A0</span></p></div><div id=3D"bloop_customfont"><p class=3D"MsoNormal"=
 style=3D"margin-left:0.5in"><span>Alvaro.</span></p></div><div id=3D"bloop=
_customfont"><p class=3D"MsoNormal" style=3D"margin-left:0.5in"><span>=C2=
=A0</span></p></div><div id=3D"bloop_customfont"><p class=3D"MsoNormal" sty=
le=3D"margin-left:0.5in"><span>=C2=A0</span></p></div><div id=3D"bloop_cust=
omfont"><p class=3D"MsoNormal" style=3D"margin-left:0.5in"><span>[1]<span c=
lass=3D"Apple-converted-space">=C2=A0</span></span><a href=3D"https://datat=
racker.ietf.org/doc/draft-ietf-ospf-link-overload/"><span>https://datatrack=
er.ietf.org/doc/draft-ietf-ospf-link-overload/</span><span></span></a><span=
>=C2=A0</span></p></div><div id=3D"bloop_customfont"><p class=3D"MsoNormal"=
 style=3D"margin-left:0.5in"><span>[2]<span class=3D"Apple-converted-space"=
>=C2=A0</span></span><a href=3D"https://www.iana.org/assignments/bgp-ls-par=
ameters/bgp-ls-parameters.xhtml#nlri-types"><span>https://www.iana.org/assi=
gnments/bgp-ls-parameters/bgp-ls-parameters.xhtml#nlri-types</span><span></=
span></a><span>=C2=A0</span></p></div><div id=3D"bloop_customfont"><p class=
=3D"MsoNormal" style=3D"margin-left:0.5in"><span>[3]<span class=3D"Apple-co=
nverted-space">=C2=A0</span></span><a href=3D"https://www.iana.org/assignme=
nts/bgp-ls-parameters/bgp-ls-parameters.xhtml#node-descriptor-link-descript=
or-prefix-descriptor-attribute-tlv"><span>https://www.iana.org/assignments/=
bgp-ls-parameters/bgp-ls-parameters.xhtml#node-descriptor-link-descriptor-p=
refix-descriptor-attribute-tlv</span><span></span></a><span>=C2=A0</span></=
p></div><div id=3D"bloop_customfont"><p class=3D"MsoNormal" style=3D"margin=
-left:0.5in"><span>[4]<span class=3D"Apple-converted-space">=C2=A0</span></=
span><a href=3D"https://datatracker.ietf.org/doc/draft-ietf-idr-bgpls-segme=
nt-routing-epe/"><span>https://datatracker.ietf.org/doc/draft-ietf-idr-bgpl=
s-segment-routing-epe/</span><span></span></a><span>=C2=A0</span></p></div>=
</div><p class=3D"MsoNormal" style=3D"margin-left:0.5in"><span>=C2=A0</span=
></p></div></font></div></span></blockquote><br class=3D"Apple-interchange-=
newline"></div> <div id=3D"bloop_sign_1523537785852377856" class=3D"bloop_s=
ign"></div></body></html>

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Alvaro Retana <aretana.ietf@gmail.com>, "idr@ietf.org" <idr@ietf.org>
CC: "draft-ietf-idr-bgpls-segment-routing-epe@ietf.org" <draft-ietf-idr-bgpls-segment-routing-epe@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, "draft-ietf-ospf-link-overload@ietf.org" <draft-ietf-ospf-link-overload@ietf.org>
Thread-Topic: Implementations of draft-ietf-idr-bgpls-segment-routing-epe (draft-ietf-ospf-link-overload)
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Date: Thu, 12 Apr 2018 13:22:38 +0000
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Subject: Re: [Idr] Implementations of draft-ietf-idr-bgpls-segment-routing-epe (draft-ietf-ospf-link-overload)
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Alvaro Retana <aretana.ietf@gmail.com>, "idr@ietf.org" <idr@ietf.org>
CC: "draft-ietf-idr-bgpls-segment-routing-epe@ietf.org" <draft-ietf-idr-bgpls-segment-routing-epe@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, "draft-ietf-ospf-link-overload@ietf.org" <draft-ietf-ospf-link-overload@ietf.org>
Thread-Topic: Implementations of draft-ietf-idr-bgpls-segment-routing-epe (draft-ietf-ospf-link-overload)
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Date: Thu, 12 Apr 2018 13:28:19 +0000
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Subject: Re: [Idr] Implementations of draft-ietf-idr-bgpls-segment-routing-epe (draft-ietf-ospf-link-overload)
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Aijun Wang <wangaijun@tsinghua.org.cn>, "Acee Lindem (acee)" <acee@cisco.com>
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Date: Thu, 12 Apr 2018 14:16:50 +0000
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From: PVLR Pavana Murthy <pvlrpm@gmail.com>
Date: Fri, 13 Apr 2018 11:21:29 +0530
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Subject: [Idr] Validation for BGP Flow-Spec Redirect to IP Action
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--000000000000aeb1db0569b476a2
Content-Type: text/plain; charset="UTF-8"

Hello,
  In the draft  draft-ietf-idr-flowspec-redirect-ip-02.txt, the following
procedure is mentioned to validate the extended community of 'Flowspec
redirect to IP'.

   BGP speakers that support the extended communities defined in this
   draft MUST also, by default, enforce the following check when
   receiving a flow-spec route from an EBGP peer: if the received flow-

   spec route has a 'redirect to IP' extended community with a 'target
   address' X (in the global administrator field) and the best matching
   route to X is not a BGP route with *origin AS* matching the peer AS
   then the extended community should be discarded and not propagated
   along with the flow-spec route to other peers.


*I have 2 doubts related to this statement.*


*What is 'origin AS' here? Is it the AS no. that is first added to the
AS_PATH? *
*In the previous version of the draft its mentioned as the last AS in
the AS_PATH.*
*Is it the last AS no. that has been added to the AS_PATH or the last
AS no. from left in AS_PATH? *


*What if the redirect target X is directly connected or reachable by a
static route and its not advertised by EBGP?*

*Do we need to consider that action invalid in that case?*



Thanks,

Pavana.

--000000000000aeb1db0569b476a2
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><font face=3D"tahoma, sans-serif">Hello,</font><div><font =
face=3D"tahoma, sans-serif">=C2=A0 In the draft=C2=A0<font style=3D"font-si=
ze:large">=C2=A0</font><span style=3D"white-space:pre;color:rgb(0,0,0)">dra=
ft-ietf-idr-flowspec-redirect-ip-02.txt, </span><span style=3D"color:rgb(0,=
0,0);white-space:pre">the following procedure is mentioned to validate the =
extended community of &#39;Flowspec </span></font></div><div><span style=3D=
"color:rgb(0,0,0);white-space:pre"><font face=3D"tahoma, sans-serif">redire=
ct to IP&#39;.</font></span></div><div><br></div><div><span style=3D"color:=
rgb(0,0,0);white-space:pre;font-size:large"><b style=3D"font-family:monospa=
ce">
</b><pre class=3D"gmail-newpage" style=3D"font-family:monospace;font-weight=
:400;font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0);=
font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;le=
tter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;wo=
rd-spacing:0px;text-decoration-style:initial;text-decoration-color:initial"=
>   BGP speakers that support the extended communities defined in this
   draft MUST also, by default, enforce the following check when
   receiving a flow-spec route from an EBGP peer: if the received flow-
</pre><pre class=3D"gmail-newpage" style=3D"font-family:monospace;font-size=
:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0);font-style:nor=
mal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:n=
ormal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0px=
;text-decoration-style:initial;text-decoration-color:initial"><span style=
=3D"font-weight:400">   spec route has a &#39;redirect to IP&#39; extended =
community with a &#39;target
   address&#39; X (in the global administrator field) and the best matching
   route to X is not a BGP route with </span><b>origin AS</b> matching the =
peer AS
   then the extended community should be discarded and not propagated
   along with the flow-spec route to other peers. </pre><pre class=3D"gmail=
-newpage" style=3D"font-family:monospace;font-size:13.3333px;margin-top:0px=
;margin-bottom:0px;color:rgb(0,0,0);font-style:normal;font-variant-ligature=
s:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;te=
xt-indent:0px;text-transform:none;word-spacing:0px;text-decoration-style:in=
itial;text-decoration-color:initial"><br></pre><pre class=3D"gmail-newpage"=
 style=3D"font-family:monospace;font-size:13.3333px;margin-top:0px;margin-b=
ottom:0px;color:rgb(0,0,0);font-style:normal;font-variant-ligatures:normal;=
font-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent=
:0px;text-transform:none;word-spacing:0px;text-decoration-style:initial;tex=
t-decoration-color:initial"><b>I have 2 doubts related to this statement.</=
b></pre><pre class=3D"gmail-newpage" style=3D"font-family:monospace;font-si=
ze:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0);font-style:n=
ormal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing=
:normal;text-align:start;text-indent:0px;text-transform:none;word-spacing:0=
px;text-decoration-style:initial;text-decoration-color:initial"><br></pre><=
pre class=3D"gmail-newpage" style=3D"font-family:monospace;font-size:13.333=
3px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0);font-style:normal;fon=
t-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;t=
ext-align:start;text-indent:0px;text-transform:none;word-spacing:0px;text-d=
ecoration-style:initial;text-decoration-color:initial"><b>What is &#39;orig=
in AS&#39; here? Is it the AS no. that is first added to the AS_PATH? </b><=
br><b>In the previous version of the draft its mentioned as the last AS in =
the AS_PATH.</b><br><b>Is it the last AS no. that has been added to the AS_=
PATH or the last AS no. from left in AS_PATH? </b><br></pre><pre class=3D"g=
mail-newpage" style=3D"font-family:monospace;font-size:13.3333px;margin-top=
:0px;margin-bottom:0px;color:rgb(0,0,0);font-style:normal;font-variant-liga=
tures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:star=
t;text-indent:0px;text-transform:none;word-spacing:0px;text-decoration-styl=
e:initial;text-decoration-color:initial"><b><br></b></pre><pre class=3D"gma=
il-newpage" style=3D"font-family:monospace;font-size:13.3333px;margin-top:0=
px;margin-bottom:0px;color:rgb(0,0,0);font-style:normal;font-variant-ligatu=
res:normal;font-variant-caps:normal;letter-spacing:normal;text-align:start;=
text-indent:0px;text-transform:none;word-spacing:0px;text-decoration-style:=
initial;text-decoration-color:initial"><b>What if the redirect target X is =
directly connected or reachable by a static route and its not advertised by=
 EBGP?</b></pre><pre class=3D"gmail-newpage" style=3D"font-family:monospace=
;font-size:13.3333px;margin-top:0px;margin-bottom:0px;color:rgb(0,0,0);font=
-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter=
-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word-s=
pacing:0px;text-decoration-style:initial;text-decoration-color:initial"><b>=
Do we need to consider that action invalid in that case?</b></pre><pre clas=
s=3D"gmail-newpage" style=3D"font-family:monospace;font-size:13.3333px;marg=
in-top:0px;margin-bottom:0px;color:rgb(0,0,0);font-style:normal;font-varian=
t-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-alig=
n:start;text-indent:0px;text-transform:none;word-spacing:0px;text-decoratio=
n-style:initial;text-decoration-color:initial"><b><br></b></pre><pre class=
=3D"gmail-newpage" style=3D"font-family:monospace;font-size:13.3333px;margi=
n-top:0px;margin-bottom:0px;color:rgb(0,0,0);font-style:normal;font-variant=
-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align=
:start;text-indent:0px;text-transform:none;word-spacing:0px;text-decoration=
-style:initial;text-decoration-color:initial"><b><br></b></pre><pre class=
=3D"gmail-newpage" style=3D"font-size:13.3333px;margin-top:0px;margin-botto=
m:0px;color:rgb(0,0,0);font-style:normal;font-variant-ligatures:normal;font=
-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px=
;text-transform:none;word-spacing:0px;text-decoration-style:initial;text-de=
coration-color:initial"><font face=3D"tahoma, sans-serif" style=3D"">Thanks=
,</font></pre><pre class=3D"gmail-newpage" style=3D"font-size:13.3333px;mar=
gin-top:0px;margin-bottom:0px;color:rgb(0,0,0);font-style:normal;font-varia=
nt-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-ali=
gn:start;text-indent:0px;text-transform:none;word-spacing:0px;text-decorati=
on-style:initial;text-decoration-color:initial"><font face=3D"tahoma, sans-=
serif" style=3D"">Pavana.</font></pre><b style=3D"font-family:monospace">
<br></b></span></div><div><font size=3D"4"><span style=3D"font-family:monos=
pace;font-weight:bold;white-space:pre;color:rgb(0,0,0)">
</span></font></div></div>

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From: "Aijun Wang" <wangaijun@tsinghua.org.cn>
To: "'Acee Lindem \(acee\)'" <acee@cisco.com>, "'Ketan Talaulikar \(ketant\)'" <ketant@cisco.com>
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Hi, Acee and Ketan:

=20

Sorry for the inaccuracy description in previous mail as =E2=80=9CIt has =
no relation to the SR technology=E2=80=9D .=20

I knew the authors of RFC7794 were the first to notice the necessary of  =
=E2=80=9CIPv4/IPv6 Source Router ID TLV=E2=80=9D when deployed  SR =
technology for inter-area scenario, but this TLV is not specific to SR.=20

It can also be used in topology retrieval  for inter-area/inter-as =
scenario.

=20

If you would like to keep =E2=80=9CSource Router-ID TLV=E2=80=9D in the =
LC draft, is it necessary to supply the corresponding definition in =
OSPFv2/v3?  All of other TLVs defined in this LC draft have =
corresponding parts in related OSPFv2/v3 and ISIS documents and this =
will keep the principle of RFC7752  described in =
https://tools.ietf.org/html/rfc7752#section-3.=20

=20

I think to strip  =E2=80=9CSource Router-ID TLV=E2=80=9D out of the =
draft can accelerate the proceeding of the current LC draft. Anyway, it =
depends on the consensus of the WG.

I am the minority of this topic but I am now one of real user of the =
BGP-LS protocol.=20

=20

=20

Best Regards.

=20

Aijun Wang

Network R&D and Operation Support Department

China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.

=E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:acee@cisco.com]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B44=E6=9C=8813=E6=97=A5 =
1:20
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; Ketan Talaulikar (ketant)
=E6=8A=84=E9=80=81: 'idr wg'; 'Susan Hares'
=E4=B8=BB=E9=A2=98: Re: =E7=AD=94=E5=A4=8D: [Idr] =E7=AD=94=E5=A4=8D: WG =
LC for draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March =
21)

=20

Hi Aijun,=20

=20

There are inter-area scenarios where the Source Router-ID TLV is needed =
to preserve the originator for advertised prefixes across OSPF and IS-IS =
area boundaries.  While SR is not the only use case for this TLV, it was =
the initial use case. Hence, there is no reason to =
=E2=80=9Cstrip=E2=80=9D this TLV from the =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 draft. While you may have =
preference for the TLV to be removed, you are in the minority and it =
need not be debated further.=20

Thanks,

Acee=20

=20

From: Aijun Wang <wangaijun@tsinghua.org.cn>
Date: Wednesday, April 11, 2018 at 11:20 PM
To: Acee Lindem <acee@cisco.com>, "Ketan Talaulikar (ketant)" =
<ketant@cisco.com>
Cc: IDR List <idr@ietf.org>, Susan Hares <shares@ndzh.com>
Subject: =E7=AD=94=E5=A4=8D: [Idr] =E7=AD=94=E5=A4=8D: WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March 21)

=20

Hi, Acee:

=20

I prefer to strip the ambiguous definition of =E2=80=9C2.3.3.  Source =
Router Identifier (Source Router-ID) TLV=E2=80=9D from the current =
draft. The reasons are the followings:

1)      It has no relation to the SR technology.

2)      The main use case for this TLV that defined in RFC7794 is for =
the IS-IS redistribute between different levels

3)      There is no semantic description for the OSPF protocol(although =
it say =E2=80=9D The Source Router-ID TLV may be used to carry the OSPF =
Router-ID of the prefix originator.=E2=80=9D)

4)      As you have pointed out, the =E2=80=9Clocal node =
descriptors=E2=80=9D associated with =E2=80=9Cprefix =
descriptors=E2=80=9D can be used to identify the IGP router advertising =
the prefix, is this overlap with the =E2=80=9C2.3.3.  Source Router =
Identifier (Source Router-ID) TLV=E2=80=9D definition(as the LC document =
states: =E2=80=9CThe Source Router-ID TLV contains the IPv4 or IPv6 =
Router-ID of the  originator of the Prefix.  For IS-IS protocol this is =
as defined in  [RFC7794].  The Source Router-ID TLV may be used to carry =
the OSPF  Router-ID of the prefix originator.=E2=80=9D)?

=20

For inter-as scenarios, the process to get the inter-as topology is =
similar no matter whether there is BGP between those ASes or not, =
although normally the BGP will run between different AS. =20

=20

=20

Best Regards.

=20

Aijun Wang

Network R&D and Operation Support Department

China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:acee@cisco.com]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B44=E6=9C=8811=E6=97=A5 =
20:04
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang; Ketan Talaulikar (ketant)
=E6=8A=84=E9=80=81: idr wg; Susan Hares
=E4=B8=BB=E9=A2=98: Re: [Idr] =E7=AD=94=E5=A4=8D: WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March 21)

=20

Hi Aijun, Sue,=20

=20

As you fully know, I don=E2=80=99t agree that you need to even use the =
Source Router-ID TLV for your use case as the Local Node Descriptors =
identify the IGP router advertising the prefix in the IGP domain. =
Furthermore, your use case is somewhat limited to the topology in figure =
1 of your draft where you have a controller with visibility of multiple =
ASes but there is no BGP between those ASes.=20

=20

Thanks,
Acee

=20

From: Idr <idr-bounces@ietf.org> on behalf of Aijun Wang =
<wangaijun@tsinghua.org.cn>
Date: Wednesday, April 11, 2018 at 7:35 AM
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
Cc: IDR List <idr@ietf.org>, Susan Hares <shares@ndzh.com>
Subject: Re: [Idr] =E7=AD=94=E5=A4=8D: WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March 21)

=20

Hi, Ketan:=20

I think the revised version is more clear.

=20

Regarding the Source Router Identifier (Source Router-ID) TLV=E2=80=9D, =
I think stripped it from the current draft did not influence the =
implementation on the device. We just reorganize the reference for this =
TLV, put it into the most suitable document for BGP-LS extension.

This TLV is more relevant to the Inter-AS situation and should be =
extended to cover all IGP scenarios, not just for ISIS in current =
document.

If possible, I can invite the author of this draft to be the co-authors =
of the BGP-LS inter-as extension draft.

=20

Except this point, I fully agree with you the updates.

=20

=20


=E5=9C=A8 2018=E5=B9=B44=E6=9C=8811=E6=97=A5=EF=BC=8C17:59=EF=BC=8CKetan =
Talaulikar (ketant) < <mailto:ketant@cisco.com> ketant@cisco.com> =
=E5=86=99=E9=81=93=EF=BC=9A

Hi Aijun,

=20

Please check inline below in your email for responses. Do let me know if =
this addresses your comments and I will post the updates accordingly.

=20

Thanks,

Ketan

=20

From: Idr < <mailto:idr-bounces@ietf.org> idr-bounces@ietf.org> On =
Behalf Of Aijun Wang
Sent: 11 April 2018 08:50
To: 'Susan Hares' < <mailto:shares@ndzh.com> shares@ndzh.com>; 'idr wg' =
< <mailto:idr@ietf.org> idr@ietf.org>
Subject: [Idr] =E7=AD=94=E5=A4=8D: WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March 21)

=20

Hi, Susan and Authors of this draft:

=20

Sorry to reply this LC so late.  The followings are my suggestions to =
this draft based on the discussion related to the mail thread  =
<https://mailarchive.ietf.org/arch/msg/idr/vSeflAMCMPL25N4nBOZu8yG19HA> =
https://mailarchive.ietf.org/arch/msg/idr/vSeflAMCMPL25N4nBOZu8yG19HA

Is it too late to response?  Please see the reply below in line.

=20

Best Regards.

=20

Aijun Wang

Network R&D and Operation Support Department

China Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: Susan Hares [ <mailto:shares@ndzh.com> =
mailto:shares@ndzh.com]=20
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2018=E5=B9=B43=E6=9C=888=E6=97=A5 =
0:41
=E6=94=B6=E4=BB=B6=E4=BA=BA: 'idr wg'
=E4=B8=BB=E9=A2=98: [Idr] WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March 21)

=20

This begins a 2 week WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04.txt from March 7th to March =
21.  During your discussion in the WG LC, please indicate the following =
things:=20

=20

1)      Do you think BGP should carry these link state information =
regarding segment routing,=20

=E2=80=9CSource Router Identifier (Source Router-ID) TLV=E2=80=9D should =
be stripped off this draft, because there are other situations(more =
general scenarios besides SR) that requires the source router of the =
prefixes, as described in  =
<https://datatracker.ietf.org/doc/draft-wang-idr-bgpls-inter-as-topology-=
ext/> =
https://datatracker.ietf.org/doc/draft-wang-idr-bgpls-inter-as-topology-e=
xt/ and discussed in mail thread  =
<https://mailarchive.ietf.org/arch/msg/idr/-T7U1yg8DmSdDmtyfqBgtnkO4I0> =
https://mailarchive.ietf.org/arch/msg/idr/-T7U1yg8DmSdDmtyfqBgtnkO4I0

[KT] You are right that Source Router-ID TLV is not SR specific. SR was =
one of the key use-cases where this was felt this was necessary =
especially in ISIS (see rfc7794). The authors of the BGP-LS SR draft =
felt it was necessary to introduce and cover it as part of this draft =
given the use-cases. It has been part of this draft since many years and =
even before it was adopted by the WG. It has implementations and =
deployments. I would say you are too late in bringing forward such a =
comment at this stage. With regards to the inter-AS draft, you have seen =
the responses on the WG mailer as well as at London and I do not have =
anything further to add.

2)      Are there any technical issues with this draft?=20

=20

Some clarifications should be added in the following sections:

a) Regarding the usage of SID/Label sub-TLV:

=E2=80=9C2.1.2 SR-Capabilities TLV=E2=80=9D, =E2=80=9C2.1.4 SR Local =
Block TLV=E2=80=9D requires all the presence of =E2=80=9CSID/Label =
sub-TLV=E2=80=9D.  It is more clear to indicate  this =E2=80=9CSID/Label =
sub-TLV=E2=80=9D represent the base of the =E2=80=9CRange Size=E2=80=9D. =


[KT] How about instead of =E2=80=9CSID/Label sub-TLV (as defined in =
Section 2.1.1).=E2=80=9D we change it to =E2=80=9CSID/Label sub-TLV (as =
defined in Section 2.1.1) which encodes the first label in the =
range.=E2=80=9D? Would this help clarify?

=20

b) Regarding the inconsistence definition among =
=E2=80=9CISIS/OSPF/OSPFv3/BGP-LS=E2=80=9D :

    =E2=80=9C2.2.1 Adjacency SID=E2=80=9D, =E2=80=9C2.2.2 LAN Adjacency =
SID TLV=E2=80=9D,=E2=80=9D2..3.1 Prefix-SID TLV=E2=80=9D

Note for =E2=80=9CLength=E2=80=9D field:   2-bytes =
=E2=80=9CReserved=E2=80=9D filed should be added when copying the =
corresponding fields from IS-IS protocol=20

[KT] Now about for Length, we say for Adj-SID & Prefix-SID =E2=80=93 =
=E2=80=9CVariable, 7 or 8 depending on Label or Index encoding of the =
SID=E2=80=9D and for LAN-Adj-SID we say =E2=80=9CVariable. For ISIS it =
would be 13 or 14 depending on Label or Index encoding of the SID. For =
OSPF it would be 11 or 12 depending on Label or Index encoding of the =
SID.=E2=80=9D

=20

                c) Regarding the definition =E2=80=9CRange TLV=E2=80=9D:

                    if the =E2=80=9CLength=E2=80=9D filed is 4, how to =
detect the existence of =E2=80=9Csub-TLV?=E2=80=9D=20

[KT] You are right. The length should be variable since we have sub-TLVs =
and also the Prefix SID sub-TLV SHOULD be present to indicate the first =
label of the Range. I will correct this.

=20

                    Is it more clear to rename the =E2=80=9CRange =
TLV=E2=80=9D as =E2=80=9CMapping-Range TLV=E2=80=9D, so as to =
distinguish it from the previous =E2=80=9CRange filed=E2=80=9D in  =
=E2=80=9C2.1.2 SR-Capabilities TLV=E2=80=9D?

[KT] I am not sure if we should make this name change at this stage. I =
don=E2=80=99t see the confusion between the two TLVs. However, if there =
is WG consensus to make this change then I would do so.

=20

                d) Regarding  the contents for =E2=80=9C3. =
Procedures=E2=80=9D:

                   Suggest to delete this section, because:

-------Contents in section 3.1, 3.2 has been mentioned in corresponding =
TLV definition(section 2.3.1), there is no more new information in this =
section.

[KT] OK will do.

=20

-------Contents in  section 3.3 and 3.4 should be merged with section =
2.3.4 to eliminate the inconsistence arose in future when update parts =
of them.

[KT] Sure, I will update it in that way too since it will be all info in =
one place for the reader.

=20

3)      Is this draft is ready for publication?=20

If the above issued is solved, it is ready for publication.

=20

For your quick access to this draft, click on the link below:=20

=20

 =
<https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-e=
xt/> =
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-ex=
t/

=20

=20

Susan Hares

=20


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<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
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<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DZH-CN link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Hi, Acee and =
Ketan:<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Sorry for the inaccuracy =
description in previous mail as =E2=80=9C</span><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>It has no relation to the SR =
technology</span><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>=E2=80=9D . =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>I knew the authors of RFC7794 =
were the first to notice the necessary of =C2=A0=E2=80=9CIPv4/IPv6 =
Source Router ID TLV=E2=80=9D when deployed =C2=A0SR technology for =
inter-area scenario, but this TLV is not specific to SR. =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>It can also be used in topology =
retrieval =C2=A0for inter-area/inter-as =
scenario.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>If you would like to keep =
=E2=80=9CSource Router-ID TLV=E2=80=9D in the LC draft, is it necessary =
to supply the corresponding definition in OSPFv2/v3? =C2=A0All of other =
TLVs defined in this LC draft have corresponding parts in related =
OSPFv2/v3 and ISIS documents and this will keep the principle of RFC7752 =
=C2=A0described in <a =
href=3D"https://tools.ietf.org/html/rfc7752#section-3">https://tools.ietf=
.org/html/rfc7752#section-3</a>. <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>I think to strip =
=C2=A0=E2=80=9CSource Router-ID TLV=E2=80=9D out of the draft can =
accelerate the proceeding of the current LC draft. Anyway, it depends on =
the consensus of the WG.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>I am the minority =
of this topic but I am now one of real user of the BGP-LS protocol. =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Best =
Regards.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Aijun =
Wang<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Network R&amp;D =
and Operation Support Department<o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'text-align:justify;text-justify:inter-ideograph'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>China Telecom =
Corporation Limited Beijing Research Institute,Beijing, =
China.<o:p></o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E4=BB=
=B6=E4=BA=BA<span lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> Acee Lindem =
(acee) [mailto:acee@cisco.com] <br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E9=80=
=81=E6=97=B6=E9=97=B4<span lang=3DEN-US>:</span></span></b><span =
lang=3DEN-US style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> =
2018</span><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4<span =
lang=3DEN-US>4</span>=E6=9C=88<span lang=3DEN-US>13</span>=E6=97=A5<span =
lang=3DEN-US> 1:20<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun Wang; Ketan =
Talaulikar (ketant)<br></span><b>=E6=8A=84=E9=80=81<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> 'idr wg'; 'Susan =
Hares'<br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: =
</span>=E7=AD=94=E5=A4=8D<span lang=3DEN-US>: [Idr] =
</span>=E7=AD=94=E5=A4=8D<span lang=3DEN-US>: WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March =
21)<o:p></o:p></span></span></p></div></div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:16.0pt'>Hi Aijun, =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:16.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'font-size:16.0pt'>There =
are inter-area scenarios where the Source Router-ID TLV is needed to =
preserve the originator for advertised prefixes across OSPF and IS-IS =
area boundaries. &nbsp;While SR is not the only use case for this TLV, =
it was the initial use case. Hence, there is no reason to =
=E2=80=9Cstrip=E2=80=9D this TLV from the =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 draft. While you may have =
preference for the TLV to be removed, you are in the minority and it =
need not be debated further. <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:16.0pt'>Thanks,<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'font-size:16.0pt'>Acee =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:16.0pt'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal style=3D'margin-left:36.0pt'><b><span =
lang=3DEN-US style=3D'font-size:12.0pt;color:black'>From: =
</span></b><span lang=3DEN-US =
style=3D'font-size:12.0pt;color:black'>Aijun Wang &lt;<a =
href=3D"mailto:wangaijun@tsinghua.org.cn">wangaijun@tsinghua.org.cn</a>&g=
t;<br><b>Date: </b>Wednesday, April 11, 2018 at 11:20 PM<br><b>To: =
</b>Acee Lindem &lt;<a =
href=3D"mailto:acee@cisco.com">acee@cisco.com</a>&gt;, &quot;Ketan =
Talaulikar (ketant)&quot; &lt;<a =
href=3D"mailto:ketant@cisco.com">ketant@cisco.com</a>&gt;<br><b>Cc: =
</b>IDR List &lt;<a href=3D"mailto:idr@ietf.org">idr@ietf.org</a>&gt;, =
Susan Hares &lt;<a =
href=3D"mailto:shares@ndzh.com">shares@ndzh.com</a>&gt;<br><b>Subject: =
</b></span><span style=3D'font-size:12.0pt;font-family:"MS =
Gothic";color:black'>=E7=AD=94=E5=A4=8D</span><span lang=3DEN-US =
style=3D'font-size:12.0pt;color:black'>: [Idr] </span><span =
style=3D'font-size:12.0pt;font-family:"MS =
Gothic";color:black'>=E7=AD=94=E5=A4=8D</span><span lang=3DEN-US =
style=3D'font-size:12.0pt;color:black'>: WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March =
21)<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Hi, Acee:</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>I prefer to strip the ambiguous =
definition of =E2=80=9C2.3.3.&nbsp; Source Router Identifier (Source =
Router-ID) TLV=E2=80=9D from the current draft. The reasons are the =
followings:</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoListParagraph =
style=3D'margin-left:54.0pt;text-indent:-18.0pt'><span =
lang=3DEN-US>1)</span><span lang=3DEN-US =
style=3D'font-size:7.0pt;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>It has no relation to the SR =
technology.</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoListParagraph =
style=3D'margin-left:54.0pt;text-indent:-18.0pt'><span =
lang=3DEN-US>2)</span><span lang=3DEN-US =
style=3D'font-size:7.0pt;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>The main use case for this TLV =
that defined in RFC7794 is for the IS-IS redistribute between different =
levels</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoListParagraph =
style=3D'margin-left:54.0pt;text-indent:-18.0pt'><span =
lang=3DEN-US>3)</span><span lang=3DEN-US =
style=3D'font-size:7.0pt;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>There is no semantic =
description for the OSPF protocol(although it say =E2=80=9D</span><span =
lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>The Source Router-ID TLV may be =
used to carry the OSPF Router-ID of the prefix =
originator.=E2=80=9D)</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoListParagraph =
style=3D'margin-left:54.0pt;text-indent:-18.0pt'><span =
lang=3DEN-US>4)</span><span lang=3DEN-US =
style=3D'font-size:7.0pt;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>As you have pointed out, the =
=E2=80=9Clocal node descriptors=E2=80=9D associated with =E2=80=9Cprefix =
descriptors=E2=80=9D can be used to identify the IGP router advertising =
the prefix, is this overlap with the =E2=80=9C2.3.3.&nbsp; Source Router =
Identifier (Source Router-ID) TLV=E2=80=9D definition(as the LC document =
states: =E2=80=9CThe Source Router-ID TLV contains the IPv4 or IPv6 =
Router-ID of the&nbsp; originator of the Prefix.&nbsp; For IS-IS =
protocol this is as defined in&nbsp; [RFC7794].&nbsp; The Source =
Router-ID TLV may be used to carry the OSPF&nbsp; Router-ID of the =
prefix originator.=E2=80=9D)?</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>For inter-as scenarios, the =
process to get the inter-as topology is similar no matter whether there =
is BGP between those ASes or not, although normally the BGP will run =
between different AS. &nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt;text-align:justify;text-justify:inter-ideogra=
ph'><span lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Best =
Regards.</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'margin-left:36.0pt;text-align:justify;text-justify:inter-ideogra=
ph'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt;text-align:justify;text-justify:inter-ideogra=
ph'><span lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Aijun =
Wang</span><span lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt;text-align:justify;text-justify:inter-ideogra=
ph'><span lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Network =
R&amp;D and Operation Support Department</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt;text-align:justify;text-justify:inter-ideogra=
ph'><span lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>China =
Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal style=3D'margin-left:36.0pt'><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E4=BB=
=B6=E4=BA=BA<span lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> Acee Lindem =
(acee) [<a href=3D"mailto:acee@cisco.com">mailto:acee@cisco.com</a>] =
<br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E9=80=
=81=E6=97=B6=E9=97=B4<span lang=3DEN-US>:</span></span></b><span =
lang=3DEN-US style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> =
2018</span><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4<span =
lang=3DEN-US>4</span>=E6=9C=88<span lang=3DEN-US>11</span>=E6=97=A5<span =
lang=3DEN-US> 20:04<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Aijun Wang; Ketan =
Talaulikar (ketant)<br></span><b>=E6=8A=84=E9=80=81<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> idr wg; Susan =
Hares<br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [Idr] =
</span>=E7=AD=94=E5=A4=8D<span lang=3DEN-US>: WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March =
21)</span></span><span lang=3DEN-US><o:p></o:p></span></p></div></div><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:16.0pt'>Hi Aijun, Sue, </span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:16.0pt'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:16.0pt'>As you fully know, I don=E2=80=99t agree that =
you need to even use the Source Router-ID TLV for your use case as the =
Local Node Descriptors identify the IGP router advertising the prefix in =
the IGP domain. Furthermore, your use case is somewhat limited to the =
topology in figure 1 of your draft where you have a controller with =
visibility of multiple ASes but there is no BGP between those ASes. =
</span><span lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:16.0pt'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:16.0pt'>Thanks,<br>Acee</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'font-size:16.0pt'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal style=3D'margin-left:72.0pt'><b><span =
lang=3DEN-US style=3D'font-size:12.0pt;color:black'>From: =
</span></b><span lang=3DEN-US style=3D'font-size:12.0pt;color:black'>Idr =
&lt;<a href=3D"mailto:idr-bounces@ietf.org">idr-bounces@ietf.org</a>&gt; =
on behalf of Aijun Wang &lt;<a =
href=3D"mailto:wangaijun@tsinghua.org.cn">wangaijun@tsinghua.org.cn</a>&g=
t;<br><b>Date: </b>Wednesday, April 11, 2018 at 7:35 AM<br><b>To: =
</b>&quot;Ketan Talaulikar (ketant)&quot; &lt;<a =
href=3D"mailto:ketant@cisco.com">ketant@cisco.com</a>&gt;<br><b>Cc: =
</b>IDR List &lt;<a href=3D"mailto:idr@ietf.org">idr@ietf.org</a>&gt;, =
Susan Hares &lt;<a =
href=3D"mailto:shares@ndzh.com">shares@ndzh.com</a>&gt;<br><b>Subject: =
</b>Re: [Idr] </span><span style=3D'font-size:12.0pt;font-family:"MS =
Gothic";color:black'>=E7=AD=94=E5=A4=8D</span><span lang=3DEN-US =
style=3D'font-size:12.0pt;color:black'>: WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March =
21)</span><span lang=3DEN-US><o:p></o:p></span></p></div><div><p =
class=3DMsoNormal style=3D'margin-left:72.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><a name=3D"_MailOriginalBody"><span =
lang=3DEN-US>Hi, Ketan: <o:p></o:p></span></a></p><div><p =
class=3DMsoNormal style=3D'margin-left:72.0pt'><span lang=3DEN-US>I =
think the revised version is more =
clear.<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US>Regarding =
the&nbsp;<b>Source Router Identifier (Source Router-ID) =
TLV=E2=80=9D,&nbsp;</b>I think stripped it from the current draft did =
not influence the implementation on the device. We just reorganize the =
reference for this TLV, put it into the most suitable document for =
BGP-LS extension.<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US>This TLV is more =
relevant to the Inter-AS situation and should be extended to cover all =
IGP scenarios, not just for ISIS in current =
document.<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US>If possible, I can =
invite the author of this draft to be the co-authors of the BGP-LS =
inter-as extension draft.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal style=3D'margin-left:72.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US>Except this point, I =
fully agree with you the updates.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal style=3D'margin-left:72.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><div><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;mar=
gin-left:72.0pt'><span lang=3DEN-US><br></span><span =
style=3D'font-family:"MS Gothic"'>=E5=9C=A8</span><span lang=3DEN-US> =
2018</span><span style=3D'font-family:"MS Gothic"'>=E5=B9=B4</span><span =
lang=3DEN-US>4</span><span style=3D'font-family:"MS =
Gothic"'>=E6=9C=88</span><span lang=3DEN-US>11</span><span =
style=3D'font-family:"MS Gothic"'>=E6=97=A5=EF=BC=8C</span><span =
lang=3DEN-US>17:59</span><span style=3D'font-family:"MS =
Gothic"'>=EF=BC=8C</span><span lang=3DEN-US>Ketan Talaulikar (ketant) =
&lt;</span><a href=3D"mailto:ketant@cisco.com"><span =
lang=3DEN-US>ketant@cisco.com</span></a><span lang=3DEN-US>&gt; =
</span><span style=3D'font-family:"MS =
Gothic"'>=E5=86=99=E9=81=93=EF=BC=9A</span><span =
lang=3DEN-US><o:p></o:p></span></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>Hi Aijun,</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>Please check inline below in your email for =
responses. Do let me know if this addresses your comments and I will =
post the updates accordingly.</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>Thanks,</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>Ketan</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal style=3D'margin-left:72.0pt'><b><span =
lang=3DEN-US>From:</span></b><span lang=3DEN-US> Idr &lt;</span><a =
href=3D"mailto:idr-bounces@ietf.org"><span =
lang=3DEN-US>idr-bounces@ietf.org</span></a><span lang=3DEN-US>&gt; =
<b>On Behalf Of </b>Aijun Wang<br><b>Sent:</b> 11 April 2018 =
08:50<br><b>To:</b> 'Susan Hares' &lt;</span><a =
href=3D"mailto:shares@ndzh.com"><span =
lang=3DEN-US>shares@ndzh.com</span></a><span lang=3DEN-US>&gt;; 'idr wg' =
&lt;</span><a href=3D"mailto:idr@ietf.org"><span =
lang=3DEN-US>idr@ietf.org</span></a><span =
lang=3DEN-US>&gt;<br><b>Subject:</b> [Idr] </span><span =
style=3D'font-family:=E5=AE=8B=E4=BD=93'>=E7=AD=94=E5=A4=8D</span><span =
lang=3DEN-US>: WG LC for draft-ietf-idr-bgp-ls-segment-routing-ext-04 =
(March 7 to March 21)<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal style=3D'margin-left:72.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Hi, Susan and Authors of this =
draft:</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Sorry to reply this LC so =
late.&nbsp; The followings are my suggestions to this draft based on the =
discussion related to the mail thread </span><a =
href=3D"https://mailarchive.ietf.org/arch/msg/idr/vSeflAMCMPL25N4nBOZu8yG=
19HA"><span lang=3DEN-US =
style=3D'font-size:10.5pt'>https://mailarchive.ietf.org/arch/msg/idr/vSef=
lAMCMPL25N4nBOZu8yG19HA</span></a><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Is it too late to =
response?&nbsp; Please see the reply below in line.</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt;text-align:justify;text-justify:inter-ideogra=
ph'><span lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Best =
Regards.</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal =
style=3D'margin-left:72.0pt;text-align:justify;text-justify:inter-ideogra=
ph'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt;text-align:justify;text-justify:inter-ideogra=
ph'><span lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Aijun =
Wang</span><span lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt;text-align:justify;text-justify:inter-ideogra=
ph'><span lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>Network =
R&amp;D and Operation Support Department</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt;text-align:justify;text-justify:inter-ideogra=
ph'><span lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>China =
Telecom Corporation Limited Beijing Research Institute,Beijing, =
China.</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal style=3D'margin-left:72.0pt'><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E4=BB=
=B6=E4=BA=BA<span lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> Susan Hares =
[</span><a href=3D"mailto:shares@ndzh.com"><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>mailto:shares@n=
dzh.com</span></a><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>] =
<br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E9=80=
=81=E6=97=B6=E9=97=B4<span lang=3DEN-US>:</span></span></b><span =
lang=3DEN-US style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> =
2018</span><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4<span =
lang=3DEN-US>3</span>=E6=9C=88<span lang=3DEN-US>8</span>=E6=97=A5<span =
lang=3DEN-US> 0:41<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> 'idr =
wg'<br></span><b>=E4=B8=BB=E9=A2=98<span lang=3DEN-US>:</span></b><span =
lang=3DEN-US> [Idr] WG LC for =
draft-ietf-idr-bgp-ls-segment-routing-ext-04 (March 7 to March =
21)</span></span><span lang=3DEN-US><o:p></o:p></span></p></div></div><p =
class=3DMsoNormal style=3D'margin-left:72.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US>This begins a 2 week WG =
LC for draft-ietf-idr-bgp-ls-segment-routing-ext-04.txt from March =
7<sup>th</sup> to March 21.&nbsp; During your discussion in the WG LC, =
please indicate the following things: <o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:72.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:108.0pt;text-indent:-18.0pt'><span =
lang=3DEN-US>1)</span><span lang=3DEN-US =
style=3D'font-size:7.0pt;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
lang=3DEN-US>Do you think BGP should carry these link state information =
regarding segment routing, <o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:7=
2.0pt;text-indent:35.15pt;mso-line-height-alt:0pt'><b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Courier =
New";color:black'>=E2=80=9CSource Router Identifier (Source Router-ID) =
TLV=E2=80=9D </span></b><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>should be stripped off this =
draft, because there are other situations(more general scenarios besides =
SR) that requires the source router of the prefixes, as described in =
</span><a =
href=3D"https://datatracker.ietf.org/doc/draft-wang-idr-bgpls-inter-as-to=
pology-ext/"><span lang=3DEN-US =
style=3D'font-size:10.5pt'>https://datatracker.ietf.org/doc/draft-wang-id=
r-bgpls-inter-as-topology-ext/</span></a><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'> and discussed in mail thread =
</span><a =
href=3D"https://mailarchive.ietf.org/arch/msg/idr/-T7U1yg8DmSdDmtyfqBgtnk=
O4I0"><span lang=3DEN-US =
style=3D'font-size:10.5pt'>https://mailarchive.ietf.org/arch/msg/idr/-T7U=
1yg8DmSdDmtyfqBgtnkO4I0</span></a><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:7=
2.0pt;mso-line-height-alt:0pt'><b><i><span lang=3DEN-US =
style=3D'color:#1F497D'>[KT] You are right that Source Router-ID TLV is =
not SR specific. SR was one of the key use-cases where this was felt =
this was necessary especially in ISIS (see rfc7794). The authors of the =
BGP-LS SR draft felt it was necessary to introduce and cover it as part =
of this draft given the use-cases. It has been part of this draft since =
many years and even before it was adopted by the WG. It has =
implementations and deployments. I would say you are too late in =
bringing forward such a comment at this stage. With regards to the =
inter-AS draft, you have seen the responses on the WG mailer as well as =
at London and I do not have anything further to add.</span></i></b><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:108.0pt;text-indent:-18.0pt'><span =
lang=3DEN-US>2)</span><span lang=3DEN-US =
style=3D'font-size:7.0pt;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
lang=3DEN-US>Are there any technical issues with this draft? =
<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:108.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:108.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Some clarifications should be =
added in the following sections:</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:108.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>a) Regarding the usage of =
SID/Label sub-TLV:</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:72.0pt;text-indent:47.25pt'><span =
lang=3DEN-US style=3D'font-size:10.5pt;color:#1F497D'>=E2=80=9C2.1.2 =
SR-Capabilities TLV=E2=80=9D, =E2=80=9C2.1.4 SR Local Block TLV=E2=80=9D =
requires all the presence of =E2=80=9CSID/Label sub-TLV=E2=80=9D. =
&nbsp;It is more clear to indicate &nbsp;this =E2=80=9CSID/Label =
sub-TLV=E2=80=9D represent the base of the =E2=80=9CRange Size=E2=80=9D. =
</span><span lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><b><i><span lang=3DEN-US =
style=3D'color:#1F497D'>[KT] How about instead of =E2=80=9CSID/Label =
sub-TLV (as defined in Section 2.1.1).=E2=80=9D we change it to =
=E2=80=9CSID/Label sub-TLV (as defined in Section 2.1.1) which encodes =
the first label in the range.=E2=80=9D? Would this help =
clarify?</span></i></b><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:108.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>b) Regarding the inconsistence =
definition among =E2=80=9CISIS/OSPF/OSPFv3/BGP-LS=E2=80=9D :</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:108.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp; =
=E2=80=9C2.2.1 Adjacency SID=E2=80=9D, =E2=80=9C2.2.2 LAN Adjacency SID =
TLV=E2=80=9D,=E2=80=9D2..3.1 Prefix-SID TLV=E2=80=9D</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:108.0pt;text-indent:9.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>Note for =
=E2=80=9CLength=E2=80=9D field: &nbsp;&nbsp;2-bytes =
=E2=80=9CReserved=E2=80=9D filed should be added when copying the =
corresponding fields from IS-IS protocol </span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><b><i><span lang=3DEN-US =
style=3D'color:#1F497D'>[KT] Now about for Length, we say for Adj-SID =
&amp; Prefix-SID =E2=80=93 =E2=80=9CVariable, 7 or 8 depending on Label =
or Index encoding of the SID=E2=80=9D and for LAN-Adj-SID we say =
=E2=80=9CVariable. For ISIS it would be 13 or 14 depending on Label or =
Index encoding of the SID. For OSPF it would be 11 or 12 depending on =
Label or Index encoding of the SID.=E2=80=9D</span></i></b><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c) =
Regarding the definition =E2=80=9CRange TLV=E2=80=9D:</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; if the =E2=80=9CLength=E2=80=9D filed is 4, how to detect the =
existence of =E2=80=9Csub-TLV?=E2=80=9D </span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><b><i><span lang=3DEN-US =
style=3D'color:#1F497D'>[KT] You are right. The length should be =
variable since we have sub-TLVs and also the Prefix SID sub-TLV SHOULD =
be present to indicate the first label of the Range. I will correct =
this.</span></i></b><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;Is it more clear to rename the =E2=80=9CRange =
TLV=E2=80=9D as =E2=80=9CMapping-Range TLV=E2=80=9D, so as to =
distinguish it from the previous =E2=80=9CRange filed=E2=80=9D in =
&nbsp;=E2=80=9C2.1.2 SR-Capabilities TLV=E2=80=9D?</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><b><i><span lang=3DEN-US =
style=3D'color:#1F497D'>[KT] I am not sure if we should make this name =
change at this stage. I don=E2=80=99t see the confusion between the two =
TLVs. However, if there is WG consensus to make this change then I would =
do so.</span></i></b><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d) Regarding =
&nbsp;the contents for =E2=80=9C3. Procedures=E2=80=9D:</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; Suggest to delete this section, because:</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt;text-indent:42.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>-------Contents in section 3.1, =
3.2 has been mentioned in corresponding TLV definition(section 2.3.1), =
there is no more new information in this section.</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><b><i><span lang=3DEN-US =
style=3D'color:#1F497D'>[KT] OK will do.</span></i></b><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US =
style=3D'color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt;text-indent:42.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>-------Contents in =
&nbsp;section 3.3 and 3.4 should be merged with section 2.3.4 to =
eliminate the inconsistence arose in future when update parts of =
them.</span><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:72.0pt'><b><i><span lang=3DEN-US =
style=3D'color:#1F497D'>[KT] Sure, I will update it in that way too =
since it will be all info in one place for the =
reader.</span></i></b><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:108.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoListParagraph =
style=3D'margin-left:108.0pt;text-indent:-18.0pt'><span =
lang=3DEN-US>3)</span><span lang=3DEN-US =
style=3D'font-size:7.0pt;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
lang=3DEN-US>Is this draft is ready for publication? =
<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:108.0pt'><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:#1F497D'>If the above issued is solved, =
it is ready for publication.</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US>For your quick access to =
this draft, click on the link below: <o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:72.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><a =
href=3D"https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-ro=
uting-ext/"><span =
lang=3DEN-US>https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segme=
nt-routing-ext/</span></a><span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:72.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US>Susan =
Hares<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:72.0pt'><span lang=3DEN-US>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p></div></blockquote></div></div></body>=
</html>
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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Aijun Wang <wangaijun@tsinghua.org.cn>, "Acee Lindem (acee)" <acee@cisco.com>
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CC: "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "idr@ietf. org" <idr@ietf.org>, "draft-ietf-idr-bgp-gr-notification@ietf.org" <draft-ietf-idr-bgp-gr-notification@ietf.org>
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--_000_53C29892C857584299CBF5D05346208A47A1A040OPEXCLILM21corp_--


From nobody Fri Apr 13 03:12:34 2018
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Reviewer: Bruno Decraene
Review result: Ready

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-idr-bgp-gr-notification-15
Reviewer: Bruno Decraene
Review Date: 2018-04-13
IETF LC End Date: 2018-04-24
Intended Status: Standards Track

=====
Summary: No issues found. This document is ready for publication.

=====
Comments:

The document is very clear. I have particularly appreciated the high level
summary of the document in the introduction section. Thanks to the authors. The
security consideration section adequately consider the security impacts of this
specification. I had already reviewed the document twice (WGLC, AD review)
hence I really needed to push in order to find some comments. In this
nitpicking context, any comment is really up to the authors.

=====
Major Issues: No major issues found.

=====
Minor Issues:

I would not call these "minor issue", but it's beyond editorial so do not
qualify as "Nits". Please find below 2 comments, on the nitpicking far side.

"If the "N" bit has not been exchanged with the peer, then to
        deal with possible consecutive restarts, a route (from the peer)
        previously marked as stale MUST be deleted."
[...]
"To put an upper bound on the amount of time a router retains the
        stale routes, an implementation MUST support a (configurable)
        timer, called the "stale timer", that imposes this upper bound."

In order to fully respect the semantic, in case of consecutive restarts (with
partial route readvertisement), it seems that the stale timer would need to be
on a per route basis. I don't think that this is the intention of the authors
(nor that this is desirable). Altough this is a local consideration, hence not
affecting the peer, the "MUST" make this statement strong. Eventually, a text
could be added saying that the timer only needs to be on a per session basis.
e.g., :s/this upper bound/this upper bound on a per session basis. ---- "This
specification doesn't change the basic security model inherent
   in [RFC4724], with the exception that the protection against repeated
   resets is relaxed. To mitigate the consequent risk that an attacker
   could use repeated session resets to prevent stale routes from ever
   being deleted, we make the stale routes timer mandatory (in practice
   it is already ubiquitous)."

FYI, I'm not completely sure to see why this document change (i.e. negatively
impacts) the security in case of repeated NOTIFICATION as I would assume that
if an attacker could sends such NOTIFICATION, it could already advertise the
routes that it wished were never deleted. Also this risk would be covered via
an adequate protection against illegitimate messages (e.g. crypto checksum,
GTSM for EBGP) However I do see an increased risk with regards to Hold Time
expiration which remains an attack vector even with the use of a crypto
checksum protection, by simply filtering some BGP packets. Especially in
deployments when the BGP session crosses a long distance or multiple links and
nodes (e.g. IBGP, layer 2 network within an IXP cf RFC 8327). May be I would
propose to raise this point or slightly rephrase on the Hold Time expiration
side, rater than the NOTIFICATION side.

=====
Nits:

§1.1
RFC 2119 has been updated by RFC 8174.
OLD:
   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

NEW:
      The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
      NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED",
      "MAY", and "OPTIONAL" in this document are to be interpreted as
      described in BCP 14 [RFC2119] [RFC8174] when, and only when, they
      appear in all capitals, as shown here.


+ New ref to RFC8174
----
§2
"("N") is defined as the BGP Graceful Notification bit"
[...]
"its Graceful NOTIFICATION bit set (value 1)"

Nitpicking, naming is not consistent.

---
" This also implies support for the format for a BGP NOTIFICATION Cease message
defined in [RFC4486]."

I'm not completely sure to see what this sentence is exactly saying. I feel
that the sentence would benefit from beeing more specific. e.g. NEW:  This also
implies support for the new "Hard Reset" subcode of the BGP NOTIFICATION Cease
message, its new behavior and new encoding of the Data field. ---- §8 "the
reference this document and [RFC4724]"

OLD:
       +--------------+------------------+------------+-----------+
       | Bit Position |       Name       | Short Name | Reference |
       +--------------+------------------+------------+-----------+
       |      0       | Forwarding State |     F      | [RFC4724] |
       |     1-7      |    unassigned    |            |           |
       +--------------+------------------+------------+-----------+

NEW:
       +--------------+------------------+------------+---------------+
       | Bit Position |       Name       | Short Name |   Reference   |
       +--------------+------------------+------------+---------------+
       |      0       | Forwarding State |     F      |   [RFC4724]   |
       |     1-7      |    unassigned    |            | This document |
       +--------------+------------------+------------+---------------+



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This begins a 2 week WG LC for draft-ietf-rs-bfd-05.txt.  You can obtain the
document at: 

 

https://datatracker.ietf.org/doc/draft-ietf-idr-rs-bfd/

 

In your comments, please consider if: 

1)      Do you know of any deployments of this technology in the Internet? 

2)      Do you believe this technology is ready for standardization? 

3)      Does this technology have the management necessary for deployment in
the Internet? 

 

 

 

Susan Hares

Co-chair

Shepherd  


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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal>This =
begins a 2 week WG LC for draft-ietf-rs-bfd-05.txt.&nbsp; You can obtain =
the document at: <o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>https://datatracker.ietf.org/doc/draft-ietf-idr-rs-bfd/=
<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
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</span></span><![endif]><span dir=3DLTR></span>Do you believe this =
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</span></span><![endif]><span dir=3DLTR></span>Does this technology have =
the management necessary for deployment in the Internet? =
<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>Susan =
Hares<o:p></o:p></p><p class=3DMsoNormal>Co-chair<o:p></o:p></p><p =
class=3DMsoNormal>Shepherd &nbsp;<o:p></o:p></p></div></body></html>
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From nobody Fri Apr 13 08:13:20 2018
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Date: Fri, 13 Apr 2018 08:13:14 -0700
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From: Randy Bush <randy@psg.com>
To: "Susan Hares" <shares@ndzh.com>
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Subject: Re: [Idr] draft-ietf-idr-rs-bfd-05 - 2 Week WG LC from 4/13 to 4/27
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> This begins a 2 week WG LC for draft-ietf-rs-bfd-05.txt.  You can obtain the
> document at: 

i do not believe it appropriate for a co-author to support their own
document, though i have twice anti-supported a document on which i was a
co-author :)

but i do note that i am unaware of any ipr on this document.

randy


From nobody Fri Apr 13 10:25:04 2018
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/fYrCf0OoQaSg-NZp1c5IHIgy7zA>
Subject: Re: [Idr] draft-ietf-idr-rs-bfd-05 - 2 Week WG LC from 4/13 to 4/27
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--Apple-Mail=_68F805CC-F6E2-4EE5-8E59-3B2C6B94233C
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(as an author, natch)

> On Apr 13, 2018, at 11:13 AM, Randy Bush <randy@psg.com> wrote:
>=20
> i do not believe it appropriate for a co-author to support their own
> document,=20

I think it's a bit pointless myself -- I assume authors do support it =
unless they step right up and say they don't (which as Randy points out =
is unusual but not unheard-of). In any case, I'll observe that in this =
case, the authors did discuss the question before asking the WG for =
WGLC.

> but i do note that i am unaware of any ipr on this document.

I also am unaware of any relevant IPR.

Thanks,

--John=

--Apple-Mail=_68F805CC-F6E2-4EE5-8E59-3B2C6B94233C
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">(as an author, natch)<div class=3D""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
Apr 13, 2018, at 11:13 AM, Randy Bush &lt;<a href=3D"mailto:randy@psg.com"=
 class=3D"">randy@psg.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" class=3D"">i do not believe it appropriate =
for a co-author to support their own</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; =
display: inline !important;" =
class=3D"">document,&nbsp;</span></div></blockquote><div><br =
class=3D""></div><div>I think it's a bit pointless myself -- I assume =
authors do support it unless they step right up and say they don't =
(which as Randy points out is unusual but not unheard-of). In any case, =
I'll observe that in this case, the authors did discuss the question =
before asking the WG for WGLC.</div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><span style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: =
inline !important;" class=3D"">but i do note that i am unaware of any =
ipr on this document.</span><br style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""></div></blockquote></div><br class=3D""></div><div class=3D"">I=
 also am unaware of any relevant IPR.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Thanks,</div><div class=3D""><br =
class=3D""></div><div class=3D"">--John</div></body></html>=

--Apple-Mail=_68F805CC-F6E2-4EE5-8E59-3B2C6B94233C--


From nobody Fri Apr 13 10:31:44 2018
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From: Job Snijders <job@ntt.net>
Date: Fri, 13 Apr 2018 17:31:29 +0000
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To: Susan Hares <shares@ndzh.com>
Cc: draft-ietf-idr-rs-bfd@ietf.org, "idr@ietf. org" <idr@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/gTdPeo22xKiUOZ1JOupi2R6l6gs>
Subject: Re: [Idr] draft-ietf-idr-rs-bfd-05 - 2 Week WG LC from 4/13 to 4/27
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Dear all,

Are there implementations? Is there an implemention report as per IDR
tradition?

If not, I don=E2=80=99t support progressing this draft at this moment.

The machinery described in this draft is not entirely straight forward,
without running code we should hold off on progressing.

Kind regards,

Job

On Fri, 13 Apr 2018 at 08:06, Susan Hares <shares@ndzh.com> wrote:

> This begins a 2 week WG LC for draft-ietf-rs-bfd-05.txt.  You can obtain
> the document at:
>
>
>
> https://datatracker.ietf.org/doc/draft-ietf-idr-rs-bfd/
>
>
>
> In your comments, please consider if:
>
> 1)      Do you know of any deployments of this technology in the
> Internet?
>
> 2)      Do you believe this technology is ready for standardization?
>
> 3)      Does this technology have the management necessary for deployment
> in the Internet?
>
>
>
>
>
>
>
> Susan Hares
>
> Co-chair
>
> Shepherd
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://www.ietf.org/mailman/listinfo/idr
>

--000000000000a9f3b50569be3e2b
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<div><div dir=3D"auto">Dear all,</div><div dir=3D"auto"><br></div><div dir=
=3D"auto">Are there implementations? Is there an implemention report as per=
 IDR tradition?</div><div dir=3D"auto"><br></div><div dir=3D"auto">If not, =
I don=E2=80=99t support progressing this draft at this moment.=C2=A0</div><=
div dir=3D"auto"><br></div><div dir=3D"auto">The machinery described in thi=
s draft is not entirely straight forward, without running code we should ho=
ld off on progressing.=C2=A0</div><div dir=3D"auto"><br></div><div dir=3D"a=
uto">Kind regards,</div><div dir=3D"auto"><br></div><div dir=3D"auto">Job</=
div><br><div class=3D"gmail_quote"><div>On Fri, 13 Apr 2018 at 08:06, Susan=
 Hares &lt;<a href=3D"mailto:shares@ndzh.com">shares@ndzh.com</a>&gt; wrote=
:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bor=
der-left:1px #ccc solid;padding-left:1ex"><div lang=3D"EN-US" link=3D"blue"=
 vlink=3D"purple"><div class=3D"m_7211811444081503784WordSection1"><p class=
=3D"MsoNormal">This begins a 2 week WG LC for draft-ietf-rs-bfd-05.txt.=C2=
=A0 You can obtain the document at: <u></u><u></u></p><p class=3D"MsoNormal=
"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal"><a href=3D"https://datatra=
cker.ietf.org/doc/draft-ietf-idr-rs-bfd/" target=3D"_blank">https://datatra=
cker.ietf.org/doc/draft-ietf-idr-rs-bfd/</a><u></u><u></u></p><p class=3D"M=
soNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">In your comments, =
please consider if: <u></u><u></u></p><p class=3D"m_7211811444081503784MsoL=
istParagraph"><u></u><span>1)<span style=3D"font:7.0pt &quot;Times New Roma=
n&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span></span><u></u><span></span>D=
o you know of any deployments of this technology in the Internet? <u></u><u=
></u></p><p class=3D"m_7211811444081503784MsoListParagraph"><u></u><span>2)=
<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 </span></span><u></u><span></span>Do you believe this technolo=
gy is ready for standardization? <u></u><u></u></p><p class=3D"m_7211811444=
081503784MsoListParagraph"><u></u><span>3)<span style=3D"font:7.0pt &quot;T=
imes New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span></span><u></u><=
span></span>Does this technology have the management necessary for deployme=
nt in the Internet? <u></u><u></u></p><p class=3D"MsoNormal"><u></u>=C2=A0<=
u></u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNor=
mal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">Susan Hares<u></u><u></=
u></p><p class=3D"MsoNormal">Co-chair<u></u><u></u></p><p class=3D"MsoNorma=
l">Shepherd =C2=A0<u></u><u></u></p></div></div>___________________________=
____________________<br>
Idr mailing list<br>
<a href=3D"mailto:Idr@ietf.org" target=3D"_blank">Idr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/idr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/idr</a><br>
</blockquote></div></div>

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From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 13 Apr 2018 17:52:56 +0000
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To: Job Snijders <job@ntt.net>
Cc: Susan Hares <shares@ndzh.com>, draft-ietf-idr-rs-bfd@ietf.org,  "idr@ietf. org" <idr@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/3Av68-xQF_jab1Du10tjQ_KPIUM>
Subject: Re: [Idr] draft-ietf-idr-rs-bfd-05 - 2 Week WG LC from 4/13 to 4/27
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I must agree with Job here.

In fact WG last call in general makes sense when spec is rock solid. And
very often issues come up during its implementations.

So while it may be up to chairs and ADs I am not sure why do we proceed
like this here in IDR.

On the draft itself I am not supporting it in current format (burden to use
extra SAFI on clients) IMO is not necessary.

Many thx
R.

On Fri, Apr 13, 2018, 19:31 Job Snijders <job@ntt.net> wrote:

> Dear all,
>
> Are there implementations? Is there an implemention report as per IDR
> tradition?
>
> If not, I don=E2=80=99t support progressing this draft at this moment.
>
> The machinery described in this draft is not entirely straight forward,
> without running code we should hold off on progressing.
>
> Kind regards,
>
> Job
>
> On Fri, 13 Apr 2018 at 08:06, Susan Hares <shares@ndzh.com> wrote:
>
>> This begins a 2 week WG LC for draft-ietf-rs-bfd-05.txt.  You can obtain
>> the document at:
>>
>>
>>
>> https://datatracker.ietf.org/doc/draft-ietf-idr-rs-bfd/
>>
>>
>>
>> In your comments, please consider if:
>>
>> 1)      Do you know of any deployments of this technology in the
>> Internet?
>>
>> 2)      Do you believe this technology is ready for standardization?
>>
>> 3)      Does this technology have the management necessary for
>> deployment in the Internet?
>>
>>
>>
>>
>>
>>
>>
>> Susan Hares
>>
>> Co-chair
>>
>> Shepherd
>> _______________________________________________
>> Idr mailing list
>> Idr@ietf.org
>> https://www.ietf.org/mailman/listinfo/idr
>>
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://www.ietf.org/mailman/listinfo/idr
>

--001a114b61d6715b620569be8bcf
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<div dir=3D"auto">I must agree with Job here.<div dir=3D"auto"><br></div><d=
iv dir=3D"auto">In fact WG last call in general makes sense when spec is ro=
ck solid. And very often issues come up during its implementations.=C2=A0</=
div><div dir=3D"auto"><br></div><div dir=3D"auto">So while it may be up to =
chairs and ADs I am not sure why do we proceed like this here in IDR.</div>=
<div dir=3D"auto"><br></div><div dir=3D"auto">On the draft itself I am not =
supporting it in current format (burden to use extra SAFI on clients) IMO i=
s not necessary.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Many th=
x</div><div dir=3D"auto">R.</div></div><br><div class=3D"gmail_quote"><div =
dir=3D"ltr">On Fri, Apr 13, 2018, 19:31 Job Snijders &lt;<a href=3D"mailto:=
job@ntt.net">job@ntt.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail=
_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:=
1ex"><div><div dir=3D"auto">Dear all,</div><div dir=3D"auto"><br></div><div=
 dir=3D"auto">Are there implementations? Is there an implemention report as=
 per IDR tradition?</div><div dir=3D"auto"><br></div><div dir=3D"auto">If n=
ot, I don=E2=80=99t support progressing this draft at this moment.=C2=A0</d=
iv><div dir=3D"auto"><br></div><div dir=3D"auto">The machinery described in=
 this draft is not entirely straight forward, without running code we shoul=
d hold off on progressing.=C2=A0</div><div dir=3D"auto"><br></div><div dir=
=3D"auto">Kind regards,</div><div dir=3D"auto"><br></div><div dir=3D"auto">=
Job</div><br><div class=3D"gmail_quote"><div>On Fri, 13 Apr 2018 at 08:06, =
Susan Hares &lt;<a href=3D"mailto:shares@ndzh.com" target=3D"_blank" rel=3D=
"noreferrer">shares@ndzh.com</a>&gt; wrote:<br></div><blockquote class=3D"g=
mail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-l=
eft:1ex"><div lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><div class=3D"m=
_5989979578706242971m_7211811444081503784WordSection1"><p class=3D"MsoNorma=
l">This begins a 2 week WG LC for draft-ietf-rs-bfd-05.txt.=C2=A0 You can o=
btain the document at: <u></u><u></u></p><p class=3D"MsoNormal"><u></u>=C2=
=A0<u></u></p><p class=3D"MsoNormal"><a href=3D"https://datatracker.ietf.or=
g/doc/draft-ietf-idr-rs-bfd/" target=3D"_blank" rel=3D"noreferrer">https://=
datatracker.ietf.org/doc/draft-ietf-idr-rs-bfd/</a><u></u><u></u></p><p cla=
ss=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">In your com=
ments, please consider if: <u></u><u></u></p><p class=3D"m_5989979578706242=
971m_7211811444081503784MsoListParagraph"><u></u><span>1)<span style=3D"fon=
t:7.0pt &quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span>=
</span><u></u><span></span>Do you know of any deployments of this technolog=
y in the Internet? <u></u><u></u></p><p class=3D"m_5989979578706242971m_721=
1811444081503784MsoListParagraph"><u></u><span>2)<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span></span><=
u></u><span></span>Do you believe this technology is ready for standardizat=
ion? <u></u><u></u></p><p class=3D"m_5989979578706242971m_72118114440815037=
84MsoListParagraph"><u></u><span>3)<span style=3D"font:7.0pt &quot;Times Ne=
w Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span></span><u></u><span></=
span>Does this technology have the management necessary for deployment in t=
he Internet? <u></u><u></u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u><=
/p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal"><u=
></u>=C2=A0<u></u></p><p class=3D"MsoNormal">Susan Hares<u></u><u></u></p><=
p class=3D"MsoNormal">Co-chair<u></u><u></u></p><p class=3D"MsoNormal">Shep=
herd =C2=A0<u></u><u></u></p></div></div>__________________________________=
_____________<br>
Idr mailing list<br>
<a href=3D"mailto:Idr@ietf.org" target=3D"_blank" rel=3D"noreferrer">Idr@ie=
tf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/idr" rel=3D"noreferrer nor=
eferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/idr</a><br=
>
</blockquote></div></div>
_______________________________________________<br>
Idr mailing list<br>
<a href=3D"mailto:Idr@ietf.org" target=3D"_blank" rel=3D"noreferrer">Idr@ie=
tf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/idr" rel=3D"noreferrer nor=
eferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/idr</a><br=
>
</blockquote></div>

--001a114b61d6715b620569be8bcf--


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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/b4c3ltkqJxHRl2Q6RlfO57wV4VM>
Subject: Re: [Idr] draft-ietf-idr-rs-bfd-05 - 2 Week WG LC from 4/13 to 4/27
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--Apple-Mail=_F6A628FC-2415-460F-B128-2D3A6C3F4EBE
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	charset=utf-8

(As a co-author, yes, really. Maybe the co-chair would even disagree =
with some of these points, who knows.[*])

> On Apr 13, 2018, at 1:31 PM, Job Snijders <job@ntt.net> wrote:
>=20
> Dear all,
>=20
> Are there implementations? Is there an implemention report as per IDR =
tradition?
>=20
> If not, I don=E2=80=99t support progressing this draft at this moment.=20=

>=20
> The machinery described in this draft is not entirely straight =
forward, without running code we should hold off on progressing.=20

For those who missed it, there is a bit more context in Job's earlier =
note, https://www.ietf.org/mail-archive/web/idr/current/msg19261.html, =
including

"ps. yes, i know IDR can have WGLC without running code, but given that
this is a non-trivial extension to BGP; I'd really like to see multiple
implementations that are able to interact with each other in the correct
way and a report detailing the interopability."

In this case the authors are, exactly and without pretense, requesting =
WGLC without running code. Which seems a funny thing coming from me -- =
sometimes all these hats I wear get too tight and give me a headache. =
Anyway, in this case we think it's worth doing the WGLC because it =
indicates as clearly as we can to potential implementors that the spec =
is "done" and will not continue to mutate. As you might recall, this =
particular spec has changed quite a lot over its history, more than =
many, and I wouldn't blame an implementor for standing back and waiting =
for the dust to settle before writing code.=20

As we all know (and have a history of doing, as a WG) if post-WGLC =
implementation experience indicates a need for changes, the draft can =
and will be updated to take them onboard, and of course if those changes =
are substantive enough, I would expect a new WGLC would be needed at =
that point. Other groups do this same review/implementation cycle by =
progressing things to RFC, then implementing, then bis-ing or otherwise =
updating the RFCs. I am not (again, as a WG member) a fan of that, and =
I'm glad we don't do things that way, although our way is also not =
perfect as witness this discussion.

Fundamentally a WGLC is a way of asking the WG, "the authors think this =
is done, do you agree?" We are asking. "We have implementations" is a =
strong argument to support the "we are done" argument, but it's neither =
necessary nor sufficient and so far the WG has deemed it desirable but =
not required for WGLC. We think there would be no benefit, and some =
harm, from letting the document sit in "active WG draft" status when =
it's *not* in fact active and the authors have moved on to other things. =
Moving it to "waiting for implementation" status, if the results of the =
WGLC support that, is more honest and more clear. I suppose another way =
of doing this would be to invent some IDR pre-WGLC-WGLC that feeds into =
the "waiting for implementation" document state, but right now we don't =
have that.

Of course you and any other WG member are free to use all the facts at =
your disposal (including the document itself, and including any reported =
implementation) to decide if you want to support a WGLC, and that's =
fine.

Finally I'd like to ask (and this *is* with the co-chair hat on) that if =
we continue a wide-ranging philosophical discussion of the IDR =
implementation tradition as opposed to a discussion of whether the doc =
is ready for WGLC, that we change the subject line accordingly.=20

Thanks!

--John

[*] "Do I contradict myself? Very well, then I contradict myself, I am =
large, I contain multitudes." --Walt Whitman=

--Apple-Mail=_F6A628FC-2415-460F-B128-2D3A6C3F4EBE
Content-Transfer-Encoding: quoted-printable
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	charset=utf-8

<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""><div class=3D""><div class=3D""><div class=3D""><div>(As a =
co-author, yes, really. Maybe the co-chair would even disagree with some =
of these points, who knows.[*])</div><div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D"">On Apr 13, 2018, at 1:31 PM, =
Job Snijders &lt;<a href=3D"mailto:job@ntt.net" =
class=3D"">job@ntt.net</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" =
class=3D""><div dir=3D"auto" class=3D"">Dear all,</div><div dir=3D"auto" =
class=3D""><br class=3D""></div><div dir=3D"auto" class=3D"">Are there =
implementations? Is there an implemention report as per IDR =
tradition?</div><div dir=3D"auto" class=3D""><br class=3D""></div><div =
dir=3D"auto" class=3D"">If not, I don=E2=80=99t support progressing this =
draft at this moment.&nbsp;</div><div dir=3D"auto" class=3D""><br =
class=3D""></div><div dir=3D"auto" class=3D"">The machinery described in =
this draft is not entirely straight forward, without running code we =
should hold off on progressing.&nbsp;</div></div></div></blockquote><br =
class=3D""></div><div>For those who missed it, there is a bit more =
context in Job's earlier note,&nbsp;<a =
href=3D"https://www.ietf.org/mail-archive/web/idr/current/msg19261.html" =
class=3D"">https://www.ietf.org/mail-archive/web/idr/current/msg19261.html=
</a>, including<div class=3D""><br class=3D""></div><div class=3D"">"ps. =
yes, i know IDR can have WGLC without running code, but given =
that</div>this is a non-trivial extension to BGP; I'd really like to see =
multiple<br class=3D"">implementations that are able to interact with =
each other in the correct<br class=3D"">way and a report detailing the =
interopability."</div></div></div></div><div><br class=3D""></div><div>In =
this case the authors are, exactly and without pretense, requesting WGLC =
without running code. Which seems a funny thing coming from me -- =
sometimes all these hats I wear get too tight and give me a headache. =
Anyway, in this case we think it's worth doing the WGLC because it =
indicates as clearly as we can to potential implementors that the spec =
is "done" and will not continue to mutate. As you might recall, this =
particular spec has changed quite a lot over its history, more than =
many, and I wouldn't blame an implementor for standing back and waiting =
for the dust to settle before writing code.&nbsp;</div><div><br =
class=3D""></div><div>As we all know (and have a history of doing, as a =
WG) if post-WGLC implementation experience indicates a need for changes, =
the draft can and will be updated to take them onboard, and of course if =
those changes are substantive enough, I would expect a new WGLC would be =
needed at that point. Other groups do this same review/implementation =
cycle by progressing things to RFC, then implementing, then bis-ing or =
otherwise updating the RFCs. I am not (again, as a WG member) a fan of =
that, and I'm glad we don't do things that way, although our way is also =
not perfect as witness this discussion.</div><div><br =
class=3D""></div><div>Fundamentally a WGLC is a way of asking the WG, =
"the authors think this is done, do you agree?" We are asking. "We have =
implementations" is a strong argument to support the "we are done" =
argument, but it's neither necessary nor sufficient and so far the WG =
has deemed it desirable but not required for WGLC. We think there would =
be no benefit, and some harm, from letting the document sit in "active =
WG draft" status when it's *not* in fact active and the authors have =
moved on to other things. Moving it to "waiting for implementation" =
status, if the results of the WGLC support that, is more honest and more =
clear. I suppose another way of doing this would be to invent some IDR =
pre-WGLC-WGLC that feeds into the "waiting for implementation" document =
state, but right now we don't have that.</div><div><br =
class=3D""></div><div>Of course you and any other WG member are free to =
use all the facts at your disposal (including the document itself, and =
including any reported implementation) to decide if you want to support =
a WGLC, and that's fine.</div><div><br class=3D""></div><div>Finally I'd =
like to ask (and this *is* with the co-chair hat on) that if we continue =
a wide-ranging philosophical discussion of the IDR implementation =
tradition as opposed to a discussion of whether the doc is ready for =
WGLC, that we change the subject line accordingly.&nbsp;</div><div><br =
class=3D""></div><div>Thanks!</div><div><br =
class=3D""></div><div>--John</div><div><br class=3D""></div><div>[*] "Do =
I&nbsp;contradict&nbsp;myself?&nbsp;Very&nbsp;well,&nbsp;then&nbsp;I&nbsp;=
contradict&nbsp;myself,&nbsp;I&nbsp;am large, I contain multitudes." =
--Walt Whitman</div></body></html>=

--Apple-Mail=_F6A628FC-2415-460F-B128-2D3A6C3F4EBE--


From nobody Sun Apr 15 09:48:48 2018
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Subject: [Idr] I-D Action: draft-ietf-idr-ls-trill-04.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Distribution of TRILL Link-State using BGP
        Authors         : Donald E. Eastlake
                          Weiguo Hao
                          Yizhou Li
                          Sujay Gupta
                          Muhammad Durrani
	Filename        : draft-ietf-idr-ls-trill-04.txt
	Pages           : 15
	Date            : 2018-04-15

Abstract:
   This draft describes a TRILL link state and MAC address reachability
   information distribution mechanism using a BGP LS extension.
   External components such as an SDN Controller can use the information
   for topology visibility, troubleshooting, network automation, and the
   like. This document updates RFC 7752.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-ls-trill/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-ls-trill-04
https://datatracker.ietf.org/doc/html/draft-ietf-idr-ls-trill-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-ls-trill-04


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

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


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From: Donald Eastlake <d3e3e3@gmail.com>
Date: Sun, 15 Apr 2018 12:57:48 -0400
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To: "idr@ietf. org" <idr@ietf.org>
Cc: trill IETF mailing list <trill@ietf.org>
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Subject: Re: [Idr] I-D Action: draft-ietf-idr-ls-trill-04.txt
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This revision is intended to resolve John Scudder's comments.

Thanks,
Donald
===============================
 Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
 155 Beaver Street, Milford, MA 01757 USA
 d3e3e3@gmail.com


On Sun, Apr 15, 2018 at 12:48 PM,  <internet-drafts@ietf.org> wrote:
>
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Inter-Domain Routing WG of the IETF.
>
>         Title           : Distribution of TRILL Link-State using BGP
>         Authors         : Donald E. Eastlake
>                           Weiguo Hao
>                           Yizhou Li
>                           Sujay Gupta
>                           Muhammad Durrani
>         Filename        : draft-ietf-idr-ls-trill-04.txt
>         Pages           : 15
>         Date            : 2018-04-15
>
> Abstract:
>    This draft describes a TRILL link state and MAC address reachability
>    information distribution mechanism using a BGP LS extension.
>    External components such as an SDN Controller can use the information
>    for topology visibility, troubleshooting, network automation, and the
>    like. This document updates RFC 7752.
>
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-idr-ls-trill/
>
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-idr-ls-trill-04
> https://datatracker.ietf.org/doc/html/draft-ietf-idr-ls-trill-04
>
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-ls-trill-04
>
>
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/


From nobody Mon Apr 16 20:13:21 2018
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From: "Dongjie (Jimmy)" <jie.dong@huawei.com>
To: 'idr wg' <idr@ietf.org>
Thread-Topic: Shepherd review of draft-ietf-idr-rfc5575bis-06
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Hi,


I have reviewed -06 version of draft-ietf-idr-rfc5575bis. This document is =
well written, and is easy to read, but has some nits which should be addres=
sed before the document is sent to IESG.



Section 2, Terminology:



"AS" stands for "Autonomous System".





Section 4 says:



" The (AFI, SAFI) pair carried in the Multiprotocol Extension Capability MU=
ST be the same as the one used to identify a particular application that us=
es this NLRI-type."


This sentence is a little bit confusing, how about explicitly say that (AFI=
=3D1, SAFI=3D133) MUST be carried in BGP Capability for IPv4 Flow Specifica=
tion, and (AFI=3D1, SAFI=3D134) MUST be carried in BGP Capability for VPNv4=
 Flow Specification?


Section 5,

"BGP NLRI type (AFI=3D1, SAFI=3D134) value, which can be used to propagate =
traffic filtering information in a BGP/MPLS VPN environment."

Here the "BGP NLRI type" should be replaced with "VPNv4 Flow Specification =
identifier".


Section 11.3,

In table 6, 0x80, 0x81, 0x82 are listed as "Sub-Type Value", which should b=
e corrected to "Type Value".

In the IANA section, the sentence "This document replaces [RFC7674]" appear=
s several times. As this has been indicated on the front page of the draft,=
 maybe this sentence can be removed from IANA section for simplicity.


Best regards,
Jie


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<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">I have reviewed -06 version =
of draft-ietf-idr-rfc5575bis. This document is well written, and is easy to=
 read, but has some nits which should be addressed before the document is s=
ent to IESG.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Section 2, Terminology:<o:p>=
</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-family:&quot;C=
ourier New&quot;">&#8220;</span><span lang=3D"EN-US">AS</span><span lang=3D=
"EN-US" style=3D"font-family:&quot;Courier New&quot;">&#8221;</span><span l=
ang=3D"EN-US"> stands for
</span><span lang=3D"EN-US" style=3D"font-family:&quot;Courier New&quot;">&=
#8220;</span><span lang=3D"EN-US">Autonomous System</span><span lang=3D"EN-=
US" style=3D"font-family:&quot;Courier New&quot;">&#8221;</span><span lang=
=3D"EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Section 4 says:<o:p></o:p></=
span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-family:&quot;C=
ourier New&quot;">&#8221;</span><span lang=3D"EN-US"> The (AFI, SAFI) pair =
carried in the Multiprotocol Extension Capability MUST be the same as the o=
ne used to identify a particular application that uses this
 NLRI-type.</span><span lang=3D"EN-US" style=3D"font-family:&quot;Courier N=
ew&quot;">&#8221;</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">This sentence is a little bit c=
onfusing, how about explicitly say that (AFI=3D1, SAFI=3D133) MUST be carri=
ed in BGP Capability for IPv4 Flow Specification, and (AFI=3D1, SAFI=3D134)=
 MUST be carried in BGP Capability for VPNv4
 Flow Specification?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Section 5,<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&#8220;BGP NLRI type (AFI=3D1, =
SAFI=3D134) value, which can be used to propagate traffic filtering informa=
tion in a BGP/MPLS VPN environment.&#8221;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Here the &#8220;BGP NLRI type&#=
8221; should be replaced with &#8220;VPNv4 Flow Specification identifier&#8=
221;.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Section 11.3, <o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In table 6, 0x80, 0x81, 0x82 ar=
e listed as &#8220;Sub-Type Value&#8221;, which should be corrected to &#82=
20;Type Value&#8221;.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In the IANA section, the senten=
ce &#8220;This document replaces [RFC7674]&#8221; appears several times. As=
 this has been indicated on the front page of the draft, maybe this sentenc=
e can be removed from IANA section for simplicity.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Best regards,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Jie<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/viXQXsngLosdbypk117wE95L_g0>
Subject: Re: [Idr] Rtgdir telechat review of draft-ietf-idr-bgp-gr-notification-15
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Hi Bruno,

Thanks for the further review. Some discussion in line below.

> On Apr 13, 2018, at 6:12 AM, Bruno Decraene =
<bruno.decraene@orange.com> wrote:
>=20
> Reviewer: Bruno Decraene
> Review result: Ready
>=20
> Hello,
>=20
> 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=8Bhttps://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__trac.tools.=
ietf.org_area_rtg_trac_wiki_RtgDir&d=3DDwIDaQ&c=3DHAkYuh63rsuhr6Scbfh0UjBX=
eMK-ndb3voDTXcWzoCI&r=3DhLt5iDJpw7ukqICc0hoT7A&m=3DgDChh7wheTA_cW1uNH2O1Zz=
aT4Ni4sju5OjDqAYKXII&s=3DCoXU6i3CuhDJ37j7puwilN_1e9W2p0HoSzX-veANZ2w&e=3D
>=20
> 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-idr-bgp-gr-notification-15
> Reviewer: Bruno Decraene
> Review Date: 2018-04-13
> IETF LC End Date: 2018-04-24
> Intended Status: Standards Track
>=20
> =3D=3D=3D=3D=3D
> Summary: No issues found. This document is ready for publication.
>=20
> =3D=3D=3D=3D=3D
> Comments:
>=20
> The document is very clear. I have particularly appreciated the high =
level
> summary of the document in the introduction section. Thanks to the =
authors. The
> security consideration section adequately consider the security =
impacts of this
> specification. I had already reviewed the document twice (WGLC, AD =
review)
> hence I really needed to push in order to find some comments. In this
> nitpicking context, any comment is really up to the authors.
>=20
> =3D=3D=3D=3D=3D
> Major Issues: No major issues found.
>=20
> =3D=3D=3D=3D=3D
> Minor Issues:
>=20
> I would not call these "minor issue", but it's beyond editorial so do =
not
> qualify as "Nits". Please find below 2 comments, on the nitpicking far =
side.
>=20
> "If the "N" bit has not been exchanged with the peer, then to
>        deal with possible consecutive restarts, a route (from the =
peer)
>        previously marked as stale MUST be deleted."
> [...]
> "To put an upper bound on the amount of time a router retains the
>        stale routes, an implementation MUST support a (configurable)
>        timer, called the "stale timer", that imposes this upper =
bound."
>=20
> In order to fully respect the semantic, in case of consecutive =
restarts (with
> partial route readvertisement), it seems that the stale timer would =
need to be
> on a per route basis. I don't think that this is the intention of the =
authors
> (nor that this is desirable). Altough this is a local consideration, =
hence not
> affecting the peer, the "MUST" make this statement strong. Eventually, =
a text
> could be added saying that the timer only needs to be on a per session =
basis.
> e.g., :s/this upper bound/this upper bound on a per session basis.

I'll give this some thought, thanks.

> ---- "This
> specification doesn't change the basic security model inherent
>   in [RFC4724], with the exception that the protection against =
repeated
>   resets is relaxed. To mitigate the consequent risk that an attacker
>   could use repeated session resets to prevent stale routes from ever
>   being deleted, we make the stale routes timer mandatory (in practice
>   it is already ubiquitous)."
>=20
> FYI, I'm not completely sure to see why this document change (i.e. =
negatively
> impacts) the security in case of repeated NOTIFICATION as I would =
assume that
> if an attacker could sends such NOTIFICATION, it could already =
advertise the
> routes that it wished were never deleted.

Well, an attacker might cause a session reset without the ability to =
insert data into the TCP stream I guess, e.g. with a RST attack. You are =
correct that there are other mitigations against such attacks, of =
course.

> Also this risk would be covered via
> an adequate protection against illegitimate messages (e.g. crypto =
checksum,
> GTSM for EBGP) However I do see an increased risk with regards to Hold =
Time
> expiration which remains an attack vector even with the use of a =
crypto
> checksum protection, by simply filtering some BGP packets. Especially =
in
> deployments when the BGP session crosses a long distance or multiple =
links and
> nodes (e.g. IBGP, layer 2 network within an IXP cf RFC 8327). May be I =
would
> propose to raise this point or slightly rephrase on the Hold Time =
expiration
> side, rater than the NOTIFICATION side.

If I understand you correctly, your point is that (a) an attacker can =
cause a holdtime expiration by filtering BGP traffic and (b) this =
technique provides some mitigation of that by additionally retaining the =
routes for the restart time? I'm a little hesitant to claim this as a =
real security benefit because for an attacker to be in position to =
filter BGP traffic, they presumably would also be in a position to =
filter user traffic. Furthermore, if they can do it for the duration of =
the holdtime they can probably also do it for the duration of the =
holdtime plus the restart time.=20

But security sections are an exercise in speculative thinking.=20

>=20
> =3D=3D=3D=3D=3D
> Nits:
>=20
> =C2=A71.1
> RFC 2119 has been updated by RFC 8174.
> OLD:
>   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
>   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
>   document are to be interpreted as described in RFC 2119 [RFC2119].
>=20
> NEW:
>      The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
>      NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED",
>      "MAY", and "OPTIONAL" in this document are to be interpreted as
>      described in BCP 14 [RFC2119] [RFC8174] when, and only when, they
>      appear in all capitals, as shown here.
>=20
>=20
> + New ref to RFC8174

Thanks!

> ----
> =C2=A72
> "("N") is defined as the BGP Graceful Notification bit"
> [...]
> "its Graceful NOTIFICATION bit set (value 1)"
>=20
> Nitpicking, naming is not consistent.

OK.

> ---
> " This also implies support for the format for a BGP NOTIFICATION =
Cease message
> defined in [RFC4486]."
>=20
> I'm not completely sure to see what this sentence is exactly saying. I =
feel
> that the sentence would benefit from beeing more specific. e.g. NEW:  =
This also
> implies support for the new "Hard Reset" subcode of the BGP =
NOTIFICATION Cease
> message, its new behavior and new encoding of the Data field.

I think the point of that sentence is that RFC 4271 doesn't talk about =
subcodes for Cease, and now we are defining a new subcode, so in =
principle we need support for both 4271 and 4486 (which does define =
subcodes). That said, the sentence doesn't really add much and perhaps =
it's perfectly obvious, so even deleting it might be fine. I'll think =
about it.

> ---- =C2=A78 "the
> reference this document and [RFC4724]"
>=20
> OLD:
>       +--------------+------------------+------------+-----------+
>       | Bit Position |       Name       | Short Name | Reference |
>       +--------------+------------------+------------+-----------+
>       |      0       | Forwarding State |     F      | [RFC4724] |
>       |     1-7      |    unassigned    |            |           |
>       +--------------+------------------+------------+-----------+
>=20
> NEW:
>       +--------------+------------------+------------+---------------+
>       | Bit Position |       Name       | Short Name |   Reference   |
>       +--------------+------------------+------------+---------------+
>       |      0       | Forwarding State |     F      |   [RFC4724]   |
>       |     1-7      |    unassigned    |            | This document |
>       +--------------+------------------+------------+---------------+

Right, thanks.

--John


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Hi Jie,

Thanks for reviewing the document. I will read thru the proposed changes =
the following days and address them with an update of the document.

Cheers,
Christoph

--
Christoph Loibl
c@tix.at | CL8-RIPE | PGP-Key-ID: 0x4B2C0055 | http://www.nextlayer.at



> On 17.04.2018, at 05:12, Dongjie (Jimmy) <jie.dong@huawei.com> wrote:
>=20
> Hi,
>=20
> I have reviewed -06 version of draft-ietf-idr-rfc5575bis. This =
document is well written, and is easy to read, but has some nits which =
should be addressed before the document is sent to IESG.
>=20
> Section 2, Terminology:
>=20
> =E2=80=9CAS=E2=80=9D stands for =E2=80=9CAutonomous System=E2=80=9D.
>=20
>=20
> Section 4 says:
>=20
> =E2=80=9D The (AFI, SAFI) pair carried in the Multiprotocol Extension =
Capability MUST be the same as the one used to identify a particular =
application that uses this NLRI-type.=E2=80=9D
>=20
> This sentence is a little bit confusing, how about explicitly say that =
(AFI=3D1, SAFI=3D133) MUST be carried in BGP Capability for IPv4 Flow =
Specification, and (AFI=3D1, SAFI=3D134) MUST be carried in BGP =
Capability for VPNv4 Flow Specification?
>=20
>=20
> Section 5,
>=20
> =E2=80=9CBGP NLRI type (AFI=3D1, SAFI=3D134) value, which can be used =
to propagate traffic filtering information in a BGP/MPLS VPN =
environment.=E2=80=9D
>=20
> Here the =E2=80=9CBGP NLRI type=E2=80=9D should be replaced with =
=E2=80=9CVPNv4 Flow Specification identifier=E2=80=9D.
>=20
>=20
> Section 11.3,
>=20
> In table 6, 0x80, 0x81, 0x82 are listed as =E2=80=9CSub-Type Value=E2=80=
=9D, which should be corrected to =E2=80=9CType Value=E2=80=9D.
>=20
> In the IANA section, the sentence =E2=80=9CThis document replaces =
[RFC7674]=E2=80=9D appears several times. As this has been indicated on =
the front page of the draft, maybe this sentence can be removed from =
IANA section for simplicity.
>=20
>=20
> Best regards,
> Jie
>=20
> _______________________________________________
> Idr mailing list
> Idr@ietf.org <mailto:Idr@ietf.org>
> https://www.ietf.org/mailman/listinfo/idr =
<https://www.ietf.org/mailman/listinfo/idr>

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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; line-break: after-white-space;" class=3D"">Hi =
Jie,<div class=3D""><br class=3D""></div><div class=3D"">Thanks for =
reviewing the document. I will read thru the proposed changes the =
following days and address them with an update of the =
document.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Cheers,&nbsp;</div><div class=3D"">Christoph<br class=3D""><div=
 class=3D""><br class=3D""></div><div class=3D""><div class=3D"">
<div style=3D"color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: 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-size-adjust: auto; =
-webkit-text-stroke-width: 0px;">--&nbsp;<br class=3D"">Christoph =
Loibl<br class=3D""><a href=3D"mailto:c@tix.at" =
class=3D"">c@tix.at</a>&nbsp;| CL8-RIPE | PGP-Key-ID:&nbsp;0x4B2C0055 =
|&nbsp;<a href=3D"http://www.nextlayer.at" =
class=3D"">http://www.nextlayer.at</a></div><div style=3D"color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: 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-size-adjust: auto; -webkit-text-stroke-width: 0px;"><br =
class=3D""></div><br class=3D"Apple-interchange-newline">
</div>
<div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On 17.04.2018, at 05:12, Dongjie (Jimmy) &lt;<a =
href=3D"mailto:jie.dong@huawei.com" class=3D"">jie.dong@huawei.com</a>&gt;=
 wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;"><div style=3D"margin: 0cm 0cm 0.0001pt; =
text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D"">Hi,<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 10.5pt; font-family: Calibri, sans-serif;" =
class=3D""><span lang=3D"EN-US" class=3D"">I have reviewed -06 version =
of draft-ietf-idr-rfc5575bis. This document is well written, and is easy =
to read, but has some nits which should be addressed before the document =
is sent to IESG.<o:p class=3D""></o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 10.5pt; font-family: Calibri, sans-serif;" =
class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 10.5pt; font-family: Calibri, sans-serif;" =
class=3D""><span lang=3D"EN-US" class=3D"">Section 2, Terminology:<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 10.5pt; font-family: Calibri, sans-serif;" class=3D""><span =
lang=3D"EN-US" class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10.5pt; font-family: =
Calibri, sans-serif;" class=3D""><span lang=3D"EN-US" =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">=E2=80=9C</span=
><span lang=3D"EN-US" class=3D"">AS</span><span lang=3D"EN-US" =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">=E2=80=9D</span=
><span lang=3D"EN-US" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>stands for<span =
class=3D"Apple-converted-space">&nbsp;</span></span><span lang=3D"EN-US" =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">=E2=80=9C</span=
><span lang=3D"EN-US" class=3D"">Autonomous System</span><span =
lang=3D"EN-US" style=3D"font-family: &quot;Courier New&quot;;" =
class=3D"">=E2=80=9D</span><span lang=3D"EN-US" class=3D"">.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 10.5pt; font-family: Calibri, sans-serif;" class=3D""><span =
lang=3D"EN-US" class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10.5pt; font-family: =
Calibri, sans-serif;" class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 10.5pt; font-family: Calibri, sans-serif;" =
class=3D""><span lang=3D"EN-US" class=3D"">Section 4 says:<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 10.5pt; font-family: Calibri, sans-serif;" class=3D""><span =
lang=3D"EN-US" class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10.5pt; font-family: =
Calibri, sans-serif;" class=3D""><span lang=3D"EN-US" =
style=3D"font-family: &quot;Courier New&quot;;" class=3D"">=E2=80=9D</span=
><span lang=3D"EN-US" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>The (AFI, SAFI) pair =
carried in the Multiprotocol Extension Capability MUST be the same as =
the one used to identify a particular application that uses this =
NLRI-type.</span><span lang=3D"EN-US" style=3D"font-family: =
&quot;Courier New&quot;;" class=3D"">=E2=80=9D</span><span lang=3D"EN-US" =
class=3D""><o:p class=3D""></o:p></span></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 10.5pt; font-family: Calibri, sans-serif;" =
class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D"">This sentence is =
a little bit confusing, how about explicitly say that (AFI=3D1, =
SAFI=3D133) MUST be carried in BGP Capability for IPv4 Flow =
Specification, and (AFI=3D1, SAFI=3D134) MUST be carried in BGP =
Capability for VPNv4 Flow Specification?<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D"">Section 5,<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D"">=E2=80=9CBGP =
NLRI type (AFI=3D1, SAFI=3D134) value, which can be used to propagate =
traffic filtering information in a BGP/MPLS VPN environment.=E2=80=9D<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D"">Here the =E2=80=9C=
BGP NLRI type=E2=80=9D should be replaced with =E2=80=9CVPNv4 Flow =
Specification identifier=E2=80=9D.<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; text-align: justify; font-size: =
10.5pt; font-family: Calibri, sans-serif;" class=3D""><span lang=3D"EN-US"=
 class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin:=
 0cm 0cm 0.0001pt; text-align: justify; font-size: 10.5pt; font-family: =
Calibri, sans-serif;" class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D"">Section =
11.3,<span class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D"">In table 6, =
0x80, 0x81, 0x82 are listed as =E2=80=9CSub-Type Value=E2=80=9D, which =
should be corrected to =E2=80=9CType Value=E2=80=9D.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D"">In the IANA =
section, the sentence =E2=80=9CThis document replaces [RFC7674]=E2=80=9D =
appears several times. As this has been indicated on the front page of =
the draft, maybe this sentence can be removed from IANA section for =
simplicity.<o:p class=3D""></o:p></span></div><div style=3D"margin: 0cm =
0cm 0.0001pt; text-align: justify; font-size: 10.5pt; font-family: =
Calibri, sans-serif;" class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; text-align: justify; font-size: 10.5pt; font-family: Calibri, =
sans-serif;" class=3D""><span lang=3D"EN-US" class=3D"">Best =
regards,<o:p class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; text-align: justify; font-size: 10.5pt; font-family: Calibri, =
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From: <bruno.decraene@orange.com>
To: "John G. Scudder" <jgs@juniper.net>
CC: "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "idr@ietf. org" <idr@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "draft-ietf-idr-bgp-gr-notification.all@ietf.org" <draft-ietf-idr-bgp-gr-notification.all@ietf.org>
Thread-Topic: Rtgdir telechat review of draft-ietf-idr-bgp-gr-notification-15
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Date: Wed, 18 Apr 2018 12:59:38 +0000
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Subject: Re: [Idr] Rtgdir telechat review of draft-ietf-idr-bgp-gr-notification-15
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/HvY9SPwt_ztQsreH4fv-i991psU>
Subject: Re: [Idr] Rtgdir telechat review of draft-ietf-idr-bgp-gr-notification-15
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--Apple-Mail=_BCAD70C8-0C5E-45C9-880E-C7CE243175FA
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Hi Bruno,

I have a -16 in preparation that takes in the various nits you raised, =
including removal of the sentence with reference to RFC 4486 (I always =
like it when I can take something out and make the document better. :-) =
With respect to the security section I think we came to the conclusion =
to leave well enough alone. That leaves me with one unresolved comment:

> On Apr 17, 2018, at 3:06 PM, John G. Scudder <jgs@juniper.net> wrote:
>=20
>> "If the "N" bit has not been exchanged with the peer, then to
>>       deal with possible consecutive restarts, a route (from the =
peer)
>>       previously marked as stale MUST be deleted."
>> [...]
>> "To put an upper bound on the amount of time a router retains the
>>       stale routes, an implementation MUST support a (configurable)
>>       timer, called the "stale timer", that imposes this upper =
bound."
>>=20
>> In order to fully respect the semantic, in case of consecutive =
restarts (with
>> partial route readvertisement), it seems that the stale timer would =
need to be
>> on a per route basis. I don't think that this is the intention of the =
authors
>> (nor that this is desirable). Altough this is a local consideration, =
hence not
>> affecting the peer, the "MUST" make this statement strong. =
Eventually, a text
>> could be added saying that the timer only needs to be on a per =
session basis.
>> e.g., :s/this upper bound/this upper bound on a per session basis.
>=20
> I'll give this some thought, thanks.

Having done that, I'm not sure the suggested text clarifies things, =
although I think it was a good point to raise. I'm not sure what it =
would mean to run the timer on a "per session basis"? Does that mean =
that I only age stale routes when the session is down, and when the =
session is re-established the timer gets reset? If so, I think the =
imagined attack could indeed work -- if my attack lets the session =
re-establish, but then knocks it over again before it can send EoR, then =
the timer wouldn't ever fire.=20

FWIW I think you are right that a good implementation would age routes =
on a per route basis. IMHO this is OK. The other alternative I can think =
of besides that, or the option I argue against above, is to have a =
per-peer stale timer that once started, is only reset if it expires or =
if EoR is received for the associated session (but it's not reset by =
session restarts). When it expires it purges all stale routes ("stale" =
could be a single bit flag per route, in any case the stale state has to =
be kept somehow already). This would bound the lifetime of stale routes =
to no more than the timer duration, which I suppose is the definition of =
an "upper bound". Possibly the text as written already implies this, =
although maybe that's asking too much of the reader.

For now I will leave the text as written, pending further discussion. =
I'll also hold back from publishing -16 pending any more input from the =
IETF LC or IESG.

Thanks,

--John=

--Apple-Mail=_BCAD70C8-0C5E-45C9-880E-C7CE243175FA
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Hi Bruno,<div class=3D""><br class=3D""></div><div class=3D"">I=
 have a -16 in preparation that takes in the various nits you raised, =
including removal of the sentence with reference to RFC 4486 (I always =
like it when I can take something out and make the document better. :-) =
With respect to the security section I think we came to the conclusion =
to leave well enough alone. That leaves me with one unresolved =
comment:</div><div class=3D""><br class=3D""><div><blockquote =
type=3D"cite" class=3D""><div class=3D"">On Apr 17, 2018, at 3:06 PM, =
John G. Scudder &lt;<a href=3D"mailto:jgs@juniper.net" =
class=3D"">jgs@juniper.net</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D""><blockquote type=3D"cite" style=3D"font-family: Helvetica; =
font-size: 12px; font-style: normal; font-variant-caps: 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-size-adjust: auto; =
-webkit-text-stroke-width: 0px;" class=3D"">"If the "N" bit has not been =
exchanged with the peer, then to<br =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;deal with possible =
consecutive restarts, a route (from the peer)<br =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;previously marked as =
stale MUST be deleted."<br class=3D"">[...]<br class=3D"">"To put an =
upper bound on the amount of time a router retains the<br =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;stale routes, an =
implementation MUST support a (configurable)<br =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;timer, called the "stale =
timer", that imposes this upper bound."<br class=3D""><br class=3D"">In =
order to fully respect the semantic, in case of consecutive restarts =
(with<br class=3D"">partial route readvertisement), it seems that the =
stale timer would need to be<br class=3D"">on a per route basis. I don't =
think that this is the intention of the authors<br class=3D"">(nor that =
this is desirable). Altough this is a local consideration, hence not<br =
class=3D"">affecting the peer, the "MUST" make this statement strong. =
Eventually, a text<br class=3D"">could be added saying that the timer =
only needs to be on a per session basis.<br class=3D"">e.g., :s/this =
upper bound/this upper bound on a per session basis.<br =
class=3D""></blockquote><br style=3D"font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><span style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: =
inline !important;" class=3D"">I'll give this some thought, =
thanks.</span><br style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" =
class=3D""></div></div></blockquote></div><br class=3D""></div><div =
class=3D"">Having done that, I'm not sure the suggested text clarifies =
things, although I think it was a good point to raise. I'm not sure what =
it would mean to run the timer on a "per session basis"? Does that mean =
that I only age stale routes when the session is down, and when the =
session is re-established the timer gets reset? If so, I think the =
imagined attack could indeed work -- if my attack lets the session =
re-establish, but then knocks it over again before it can send EoR, then =
the timer wouldn't ever fire.&nbsp;</div><div class=3D""><br =
class=3D""></div><div class=3D"">FWIW I think you are right that a good =
implementation would age routes on a per route basis. IMHO this is OK. =
The other alternative I can think of besides that, or the option I argue =
against above, is to have a per-peer stale timer that once started, is =
only reset if it expires or if EoR is received for the associated =
session (but it's not reset by session restarts). When it expires it =
purges all stale routes ("stale" could be a single bit flag per route, =
in any case the stale state has to be kept somehow already). This would =
bound the lifetime of stale routes to no more than the timer duration, =
which I suppose is the definition of an "upper bound". Possibly the text =
as written already implies this, although maybe that's asking too much =
of the reader.</div><div class=3D""><br class=3D""></div><div =
class=3D"">For now I will leave the text as written, pending further =
discussion. I'll also hold back from publishing -16 pending any more =
input from the IETF LC or IESG.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Thanks,</div><div class=3D""><br =
class=3D""></div><div class=3D"">--John</div></body></html>=

--Apple-Mail=_BCAD70C8-0C5E-45C9-880E-C7CE243175FA--


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The WG adoption call for draft-snijders-idr-rfc8203bis has been adopted.
The authors should submit this draft as draft-idr-rfc8203bis-00.txt. 

 

Susan Hares

Co-chair IDR 


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From: <bruno.decraene@orange.com>
To: John Scudder <jgs@juniper.net>
CC: "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "idr@ietf. org" <idr@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "draft-ietf-idr-bgp-gr-notification.all@ietf.org" <draft-ietf-idr-bgp-gr-notification.all@ietf.org>
Thread-Topic: Rtgdir telechat review of draft-ietf-idr-bgp-gr-notification-15
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Subject: Re: [Idr] Rtgdir telechat review of draft-ietf-idr-bgp-gr-notification-15
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Hi John

Thanks for the follow up.
Please see inline [Bruno]

From: John Scudder [mailto:jgs@juniper.net]
Sent: Wednesday, April 18, 2018 8:32 PM
To: DECRAENE Bruno IMT/OLN
Cc: rtg-dir@ietf.org; idr@ietf. org; ietf@ietf.org; draft-ietf-idr-bgp-gr-n=
otification.all@ietf.org
Subject: Re: Rtgdir telechat review of draft-ietf-idr-bgp-gr-notification-15

Hi Bruno,

I have a -16 in preparation that takes in the various nits you raised, incl=
uding removal of the sentence with reference to RFC 4486 (I always like it =
when I can take something out and make the document better. :-) With respec=
t to the security section I think we came to the conclusion to leave well e=
nough alone.

[Bruno] Thanks (and agreed).

That leaves me with one unresolved comment:

On Apr 17, 2018, at 3:06 PM, John G. Scudder <jgs@juniper.net<mailto:jgs@ju=
niper.net>> wrote:

"If the "N" bit has not been exchanged with the peer, then to
      deal with possible consecutive restarts, a route (from the peer)
      previously marked as stale MUST be deleted."
[...]
"To put an upper bound on the amount of time a router retains the
      stale routes, an implementation MUST support a (configurable)
      timer, called the "stale timer", that imposes this upper bound."

In order to fully respect the semantic, in case of consecutive restarts (wi=
th
partial route readvertisement), it seems that the stale timer would need to=
 be
on a per route basis. I don't think that this is the intention of the autho=
rs
(nor that this is desirable). Altough this is a local consideration, hence =
not
affecting the peer, the "MUST" make this statement strong. Eventually, a te=
xt
could be added saying that the timer only needs to be on a per session basi=
s.
e.g., :s/this upper bound/this upper bound on a per session basis.

I'll give this some thought, thanks.

Having done that, I'm not sure the suggested text clarifies things, althoug=
h I think it was a good point to raise. I'm not sure what it would mean to =
run the timer on a "per session basis"? Does that mean that I only age stal=
e routes when the session is down, and when the session is re-established t=
he timer gets reset?

[Bruno] That's not what I had in mind

If so, I think the imagined attack could indeed work -- if my attack lets t=
he session re-establish, but then knocks it over again before it can send E=
oR, then the timer wouldn't ever fire.

[Bruno] Agreed

FWIW I think you are right that a good implementation would age routes on a=
 per route basis. IMHO this is OK.

[Bruno] If it's ok for you, it's also ok for me. I originally felt that tha=
t was too much to track using N timers, but now I guess that there are more=
 intelligent ways to track this using a single timer (per session)

The other alternative I can think of besides that, or the option I argue ag=
ainst above, is to have a per-peer stale timer that once started, is only r=
eset if it expires or if EoR is received for the associated session (but it=
's not reset by session restarts).

[Bruno] That's the one I had in mind.

When it expires it purges all stale routes ("stale" could be a single bit f=
lag per route, in any case the stale state has to be kept somehow already).=
 This would bound the lifetime of stale routes to no more than the timer du=
ration, which I suppose is the definition of an "upper bound".

[Bruno] That's good enough to me.
Nitpicking again, this does set an upper bound for the routes, but as an op=
erator being asked to configure the value, I would have assumed that the co=
nfigured timer value was exactly this limit and would be surprised to see t=
he route disappear before. (although in a real conditions, I'm not sure the=
 operator would easily track which routes had been re-advertised in a previ=
ous restart)
Again, that behavior works for me but if this is the intended behavior, it =
could be useful to explain it to the network operator, e.g. using your abov=
e text.

Possibly the text as written already implies this, although maybe that's as=
king too much of the reader.

[Bruno] My comment was that the text may be understood both ways (per route=
, or per session as per your latest alternative). Now does it really matter=
?? (except for not understanding it as per the first "per session" interpre=
tation). I leave this to you.

In all cases, thanks for the follow up, on this level of nitpicking, at thi=
s late stage.
--Bruno

For now I will leave the text as written, pending further discussion. I'll =
also hold back from publishing -16 pending any more input from the IETF LC =
or IESG.

Thanks,

--John

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</o:shapelayout></xml><![endif]-->
</head>
<body lang=3D"FR" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,&quot;sans-serif&quot;;color:black">Hi John<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">Thanks for the=
 follow up.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">Please see inl=
ine [Bruno]<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> John Scu=
dder [mailto:jgs@juniper.net]
<br>
<b>Sent:</b> Wednesday, April 18, 2018 8:32 PM<br>
<b>To:</b> DECRAENE Bruno IMT/OLN<br>
<b>Cc:</b> rtg-dir@ietf.org; idr@ietf. org; ietf@ietf.org; draft-ietf-idr-b=
gp-gr-notification.all@ietf.org<br>
<b>Subject:</b> Re: Rtgdir telechat review of draft-ietf-idr-bgp-gr-notific=
ation-15<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hi Bruno,<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">I have a -16 in preparation that takes in the variou=
s nits you raised, including removal of the sentence with reference to RFC =
4486 (I always like it when I can take something out and make the document =
better. :-) With respect to the security
 section I think we came to the conclusion to leave well enough alone. <spa=
n style=3D"color:black">
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">[Bruno] Thanks=
 (and agreed).</span><span style=3D"font-size:10.0pt;font-family:&quot;Aria=
l&quot;,&quot;sans-serif&quot;;color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">That leaves me with one unresol=
ved comment:<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal">On Apr 17, 2018, at 3:06 PM, John G. Scudder &lt;<a =
href=3D"mailto:jgs@juniper.net">jgs@juniper.net</a>&gt; wrote:<o:p></o:p></=
p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt;font-variant-caps=
: normal;orphans: auto;text-align:start;widows: auto;-webkit-text-size-adju=
st: auto;-webkit-text-stroke-width: 0px;word-spacing:0px">
<p class=3D"MsoNormal"><span style=3D"font-size:9.0pt;font-family:&quot;Hel=
vetica&quot;,&quot;sans-serif&quot;">&quot;If the &quot;N&quot; bit has not=
 been exchanged with the peer, then to<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;deal with possible consecutive restarts=
, a route (from the peer)<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;previously marked as stale MUST be dele=
ted.&quot;<br>
[...]<br>
&quot;To put an upper bound on the amount of time a router retains the<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;stale routes, an implementation MUST su=
pport a (configurable)<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;timer, called the &quot;stale timer&quo=
t;, that imposes this upper bound.&quot;<br>
<br>
In order to fully respect the semantic, in case of consecutive restarts (wi=
th<br>
partial route readvertisement), it seems that the stale timer would need to=
 be<br>
on a per route basis. I don't think that this is the intention of the autho=
rs<br>
(nor that this is desirable). Altough this is a local consideration, hence =
not<br>
affecting the peer, the &quot;MUST&quot; make this statement strong. Eventu=
ally, a text<br>
could be added saying that the timer only needs to be on a per session basi=
s.<br>
e.g., :s/this upper bound/this upper bound on a per session basis.<o:p></o:=
p></span></p>
</blockquote>
<p class=3D"MsoNormal"><span style=3D"font-size:9.0pt;font-family:&quot;Hel=
vetica&quot;,&quot;sans-serif&quot;"><br>
I'll give this some thought, thanks.</span><o:p></o:p></p>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Having done that, I'm not sure the suggested text cl=
arifies things, although I think it was a good point to raise. I'm not sure=
 what it would mean to run the timer on a &quot;per session basis&quot;? Do=
es that mean that I only age stale routes when
 the session is down, and when the session is re-established the timer gets=
 reset?<span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">[Bruno] That&#=
8217;s not what I had in mind</span><span lang=3D"EN-US" style=3D"font-size=
:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">If so, I think the imagined att=
ack could indeed work -- if my attack lets the session re-establish, but th=
en knocks it over again before it can send EoR, then the timer wouldn't eve=
r fire.&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">[Bruno] Agreed=
</span><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal">FWIW I think you are right that a good implementatio=
n would age routes on a per route basis.
<span lang=3D"EN-US">IMHO this is OK.<span style=3D"color:black"><o:p></o:p=
></span></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">[Bruno] If it&=
#8217;s ok for you, it&#8217;s also ok for me. I originally felt that that =
was too much to track using N timers, but now I guess that there are more
 intelligent ways to track this using a single timer (per session)</span><s=
pan lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,=
&quot;sans-serif&quot;;color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The other alternative I can thi=
nk of besides that, or the option I argue against above, is to have a per-p=
eer stale timer that once started, is only reset if it expires or if EoR is=
 received for the associated session
 (but it's not reset by session restarts). <span style=3D"color:black"><o:p=
></o:p></span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">[Bruno] That&#=
8217;s the one I had in mind.</span><span lang=3D"EN-US" style=3D"font-size=
:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">When it expires it purges all s=
tale routes (&quot;stale&quot; could be a single bit flag per route, in any=
 case the stale state has to be kept somehow already).
</span>This would bound the lifetime of stale routes to no more than the ti=
mer duration, which I suppose is the definition of an &quot;upper bound&quo=
t;.<span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">[Bruno] That&#=
8217;s good enough to me.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">Nitpicking aga=
in, this does set an upper bound for the routes, but as an operator being a=
sked to configure the value, I would have assumed that the
 configured timer value was exactly this limit and would be surprised to se=
e the route disappear before. (although in a real conditions, I&#8217;m not=
 sure the operator would easily track which routes had been re-advertised i=
n a previous restart)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">Again, that be=
havior works for me but if this is the intended behavior, it could be usefu=
l to explain it to the network operator, e.g. using your above
 text. </span><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&q=
uot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Possibly the text as written al=
ready implies this, although maybe that's asking too much of the reader.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">[Bruno] My com=
ment was that the text may be understood both ways (per route, or per sessi=
on as per your latest alternative). Now does it really matter??
 (except for not understanding it as per the first &#8220;per session&#8221=
; interpretation). I leave this to you.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">In all cases, =
thanks for the follow up, on this level of nitpicking, at this late stage.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">--Bruno</span>=
<span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Arial&quot=
;,&quot;sans-serif&quot;;color:black"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">For now I will leave the text a=
s written, pending further discussion. I'll also hold back from publishing
</span>-16 pending any more input from the IETF LC or IESG.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">--John<o:p></o:p></p>
</div>
</div>
</div>
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From nobody Fri Apr 20 19:29:58 2018
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Subject: [Idr] Opsdir last call review of draft-ietf-idr-bgp-gr-notification-15
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Reviewer: Qin Wu
Review result: Has Nits

I have reviewed this document as part of the Operational directorate¡¯s ongoing
effort to review all IETF documents being processed by the IESG.  These
comments were written with the intent of improving the operational aspects of
the IETF drafts. Comments that are not addressed in last call may be included
in AD reviews during the IESG review.  Document editors and WG chairs should
treat these comments just like any other last call comments. Document reviewed:
 draft-ietf-idr-bgp-gr-notification

Summary:
This document updates RFC 4724 by defining an extension that permits the
Graceful Restart procedures to be performed when the BGP speaker receives a BGP
NOTIFICATION Message or the Hold Time expires.

Major issue: None
Minor issue: Editorial
1.Abstraction:
I am not familiar with history of RFC4724 and this document. I am wondering why
not relax BGP graceful restart and apply usage of BGP graceful restart message
to all BGP protocols messages rather than introduce a new flag within restart
flags? Why not make bis document to update RFC4724?

2.Abstraction:
How session restart is different session reset or the session is fully
terminated? Do we use hard reset subcode to indicate those features separately?
If they are same things, please make sure to use consistent terminology in the
document. 3. Section 2, 3rd paragraph Why we use a different bit instead ¡°R¡±
bit to indicate graceful restart support for BGP notification message. 4.
Section 2, last paragraph Can you give an example what are these new parameters
and how these parameters apply? How these parameters are related to relevant
routes? 5.Section 3.1 said: ¡° In short, the Hard
   Reset encapsulates another NOTIFICATION message in its data portion.

¡±
It looks one Notification message is embedded into another notification
message? Is there any example for that. Also it is not clear to me what do you
mean by as appropriate for in section 3.1 last paragraph? Would it be great to
add more text to explain the usage of subcode or add reference to point to
section 5 and point 5.2. 6.Section 4.1, 2nd paragraph I am wondering whether
the proposed procedures and rules are back compatible with the procedure and
rule defined in RFC4724? 7.Section 5.1 Can you provide definition of Graceful
Cease in the terminology section? How Graceful cease is different from Graceful
restart since I am confused.


From nobody Sat Apr 21 12:14:04 2018
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Dissemination of Flow Specification Rules
        Authors         : Susan Hares
                          Christoph Loibl
                          Robert Raszuk
                          Danny McPherson
                          Martin Bacher
	Filename        : draft-ietf-idr-rfc5575bis-07.txt
	Pages           : 33
	Date            : 2018-04-21

Abstract:
   This document updates [RFC5575] which defines a Border Gateway
   Protocol Network Layer Reachability Information (BGP NLRI) encoding
   format that can be used to distribute traffic Flow Specifications.
   This allows the routing system to propagate information regarding
   more specific components of the traffic aggregate defined by an IP
   destination prefix.

   It specifies IPv4 traffic Flow Specifications via a BGP NLRI which
   carries traffic Flow Specification filter, and an Extended community
   value which encodes actions a routing system can take if the packet
   matches the traffic flow filters.  The flow filters and the actions
   are processed in a fixed order.  Other drafts specify IPv6, MPLS
   addresses, L2VPN addresses, and NV03 encapsulation of IP addresses.

   This document updates [RFC5575] to correct unclear specifications in
   the flow filters and to provide rules for actions which interfere
   (e.g. redirection of traffic and flow filtering).

   Applications which use the bgp Flow Specification are: 1) application
   which automate inter-domain coordination of traffic filtering, such
   as what is required in order to mitigate (distributed) denial-of-
   service attacks; 2) applications which control traffic filtering in
   the context of a BGP/MPLS VPN service, and 3) applications with
   centralized control of traffic in a SDN or NFV context.  Some
   deployments of these three applications can be handled by the strict
   ordering of the BGP NLRI traffic flow filters, and the strict actions
   encoded in the extended community Flow Specification actions.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-rfc5575bis/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-rfc5575bis-07
https://datatracker.ietf.org/doc/html/draft-ietf-idr-rfc5575bis-07

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-rfc5575bis-07


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

Internet-Drafts are also available by anonymous FTP at:
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Hi Jie,

Thanks for reviewing the document. In response to your review I uploaded =
a new version -7 of the document. We think it addresses all but your =
last comment:

We did edit the IANA section as suggested:

> In the IANA section, the sentence =E2=80=9CThis document replaces =
[RFC7674]=E2=80=9D appears several times. As this has been indicated on =
the front page of the draft, maybe this sentence can be removed from =
IANA section for simplicity.

I remember that we sent the document over to IANA in order to get this =
section right, prior to asking for WG LC. The response was that we shall =
be really clear about those references to RFC7674 being removed. We =
think, that even though this is highly redundant, we should keep this in =
the document as it is.

Please see rfcdiff for the small changes that I edited into the =
document:

=
https://www.ietf.org/rfcdiff?url1=3Ddraft-ietf-idr-rfc5575bis-06&url2=3Ddr=
aft-ietf-idr-rfc5575bis-07

Christoph

--
Christoph Loibl
c@tix.at | CL8-RIPE | PGP-Key-ID: 0x4B2C0055 | http://www.nextlayer.at



> On 17.04.2018, at 05:12, Dongjie (Jimmy) <jie.dong@huawei.com> wrote:
>=20
> Hi,
>=20
> I have reviewed -06 version of draft-ietf-idr-rfc5575bis. This =
document is well written, and is easy to read, but has some nits which =
should be addressed before the document is sent to IESG.
>=20
> Section 2, Terminology:
>=20
> =E2=80=9CAS=E2=80=9D stands for =E2=80=9CAutonomous System=E2=80=9D.
>=20
>=20
> Section 4 says:
>=20
> =E2=80=9D The (AFI, SAFI) pair carried in the Multiprotocol Extension =
Capability MUST be the same as the one used to identify a particular =
application that uses this NLRI-type.=E2=80=9D
>=20
> This sentence is a little bit confusing, how about explicitly say that =
(AFI=3D1, SAFI=3D133) MUST be carried in BGP Capability for IPv4 Flow =
Specification, and (AFI=3D1, SAFI=3D134) MUST be carried in BGP =
Capability for VPNv4 Flow Specification?
>=20
>=20
> Section 5,
>=20
> =E2=80=9CBGP NLRI type (AFI=3D1, SAFI=3D134) value, which can be used =
to propagate traffic filtering information in a BGP/MPLS VPN =
environment.=E2=80=9D
>=20
> Here the =E2=80=9CBGP NLRI type=E2=80=9D should be replaced with =
=E2=80=9CVPNv4 Flow Specification identifier=E2=80=9D.
>=20
>=20
> Section 11.3,
>=20
> In table 6, 0x80, 0x81, 0x82 are listed as =E2=80=9CSub-Type Value=E2=80=
=9D, which should be corrected to =E2=80=9CType Value=E2=80=9D.
>=20
> In the IANA section, the sentence =E2=80=9CThis document replaces =
[RFC7674]=E2=80=9D appears several times. As this has been indicated on =
the front page of the draft, maybe this sentence can be removed from =
IANA section for simplicity.
>=20
>=20
> Best regards,
> Jie
>=20
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://www.ietf.org/mailman/listinfo/idr


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From nobody Sat Apr 21 12:35:57 2018
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Date: Sat, 21 Apr 2018 21:35:48 +0200
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Cc: idr wg <idr@ietf.org>
To: "Dongjie (Jimmy)" <jie.dong@huawei.com>
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Subject: Re: [Idr] Shepherd review of draft-ietf-idr-rfc5575bis-06
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Hi,

Sorry I was unclear in my last mail=E2=80=A6

> We did edit the IANA section as suggested:

I actually intended to write:

We did *NOT* edit the IANA section as suggested (the reason is given =
below):

Sorry

Christoph.


--
Christoph Loibl
c@tix.at | CL8-RIPE | PGP-Key-ID: 0x4B2C0055 | http://www.nextlayer.at



> On 21.04.2018, at 21:24, Christoph Loibl <c@tix.at> wrote:
>=20
> Hi Jie,
>=20
> Thanks for reviewing the document. In response to your review I =
uploaded a new version -7 of the document. We think it addresses all but =
your last comment:
>=20
> We did edit the IANA section as suggested:
>=20
>> In the IANA section, the sentence =E2=80=9CThis document replaces =
[RFC7674]=E2=80=9D appears several times. As this has been indicated on =
the front page of the draft, maybe this sentence can be removed from =
IANA section for simplicity.
>=20
> I remember that we sent the document over to IANA in order to get this =
section right, prior to asking for WG LC. The response was that we shall =
be really clear about those references to RFC7674 being removed. We =
think, that even though this is highly redundant, we should keep this in =
the document as it is.
>=20
> Please see rfcdiff for the small changes that I edited into the =
document:
>=20
> =
https://www.ietf.org/rfcdiff?url1=3Ddraft-ietf-idr-rfc5575bis-06&url2=3Ddr=
aft-ietf-idr-rfc5575bis-07
>=20
> Christoph
>=20
> --
> Christoph Loibl
> c@tix.at | CL8-RIPE | PGP-Key-ID: 0x4B2C0055 | http://www.nextlayer.at
>=20
>=20
>=20
>> On 17.04.2018, at 05:12, Dongjie (Jimmy) <jie.dong@huawei.com> wrote:
>>=20
>> Hi,
>>=20
>> I have reviewed -06 version of draft-ietf-idr-rfc5575bis. This =
document is well written, and is easy to read, but has some nits which =
should be addressed before the document is sent to IESG.
>>=20
>> Section 2, Terminology:
>>=20
>> =E2=80=9CAS=E2=80=9D stands for =E2=80=9CAutonomous System=E2=80=9D.
>>=20
>>=20
>> Section 4 says:
>>=20
>> =E2=80=9D The (AFI, SAFI) pair carried in the Multiprotocol Extension =
Capability MUST be the same as the one used to identify a particular =
application that uses this NLRI-type.=E2=80=9D
>>=20
>> This sentence is a little bit confusing, how about explicitly say =
that (AFI=3D1, SAFI=3D133) MUST be carried in BGP Capability for IPv4 =
Flow Specification, and (AFI=3D1, SAFI=3D134) MUST be carried in BGP =
Capability for VPNv4 Flow Specification?
>>=20
>>=20
>> Section 5,
>>=20
>> =E2=80=9CBGP NLRI type (AFI=3D1, SAFI=3D134) value, which can be used =
to propagate traffic filtering information in a BGP/MPLS VPN =
environment.=E2=80=9D
>>=20
>> Here the =E2=80=9CBGP NLRI type=E2=80=9D should be replaced with =
=E2=80=9CVPNv4 Flow Specification identifier=E2=80=9D.
>>=20
>>=20
>> Section 11.3,
>>=20
>> In table 6, 0x80, 0x81, 0x82 are listed as =E2=80=9CSub-Type =
Value=E2=80=9D, which should be corrected to =E2=80=9CType Value=E2=80=9D.=

>>=20
>> In the IANA section, the sentence =E2=80=9CThis document replaces =
[RFC7674]=E2=80=9D appears several times. As this has been indicated on =
the front page of the draft, maybe this sentence can be removed from =
IANA section for simplicity.
>>=20
>>=20
>> Best regards,
>> Jie
>>=20
>> _______________________________________________
>> Idr mailing list
>> Idr@ietf.org
>> https://www.ietf.org/mailman/listinfo/idr
>=20
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://www.ietf.org/mailman/listinfo/idr


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From nobody Mon Apr 23 07:12:05 2018
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Subject: [Idr] I-D Action: draft-ietf-idr-rtc-no-rt-09.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Route Target Constrained Distribution of Routes with no Route Targets
        Authors         : Eric C. Rosen
                          Keyur Patel
                          Jeffrey Haas
                          Robert Raszuk
	Filename        : draft-ietf-idr-rtc-no-rt-09.txt
	Pages           : 7
	Date            : 2018-04-23

Abstract:
   There are a variety of BGP-enabled services in which the originator
   of a BGP route may attach one or more "Route Targets" to the route.
   By means of a procedure known as "RT Constrained Distribution" (RTC),
   a given BGP speaker (call it "B") can announce the set of RTs in
   which it has interest.  The implication is that if a particular route
   (call it "R") carries any RTs at all, BGP speaker B wants to receive
   route R if and only if B has announced interest in one of the RTs
   carried by R.  However, if route R does not carry any RTs at all,
   prior specifications do not make it clear whether B's use of RTC
   implies that it does not want to receive route R.  This has caused
   interoperability problems in the field, as some implementations of
   RTC do not allow B to receive R, but some services presuppose that B
   will receive R.  This document updates RFC 4684 by clarifying the
   effect of the RTC mechanism on routes that do not have any RTs.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-rtc-no-rt/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-rtc-no-rt-09
https://datatracker.ietf.org/doc/html/draft-ietf-idr-rtc-no-rt-09

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-rtc-no-rt-09


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

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


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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/EgQtR9Esdagyrq56FIT9v_5ci-0>
Subject: Re: [Idr] Opsdir last call review of draft-ietf-idr-bgp-gr-notification-15
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Thanks for the review. Some responses in line.

> On Apr 20, 2018, at 10:29 PM, Qin Wu <bill.wu@huawei.com> wrote:
>=20
> Reviewer: Qin Wu
> Review result: Has Nits
>=20
> I have reviewed this document as part of the Operational =
directorate=C2=A1=C2=AFs ongoing
> effort to review all IETF documents being processed by the IESG.  =
These
> comments were written with the intent of improving the operational =
aspects of
> the IETF drafts. Comments that are not addressed in last call may be =
included
> in AD reviews during the IESG review.  Document editors and WG chairs =
should
> treat these comments just like any other last call comments. Document =
reviewed:
> draft-ietf-idr-bgp-gr-notification
>=20
> Summary:
> This document updates RFC 4724 by defining an extension that permits =
the
> Graceful Restart procedures to be performed when the BGP speaker =
receives a BGP
> NOTIFICATION Message or the Hold Time expires.
>=20
> Major issue: None
> Minor issue: Editorial
> 1.Abstraction:
> I am not familiar with history of RFC4724 and this document. I am =
wondering why
> not relax BGP graceful restart and apply usage of BGP graceful restart =
message
> to all BGP protocols messages rather than introduce a new flag within =
restart
> flags? Why not make bis document to update RFC4724?

For two reasons. First and most important, some network operators may =
not want to use GR semantics in the expanded manner this spec =
introduces. Second, because backwards-compatibility concerns might well =
arise if there were no on-the-wire signaling about what semantics your =
peer would support. (Note, I haven't given the second a lot of thought, =
because the first rules it out anyway.)

> 2.Abstraction:
> How session restart is different session reset or the session is fully
> terminated? Do we use hard reset subcode to indicate those features =
separately?
> If they are same things, please make sure to use consistent =
terminology in the
> document.

A fair criticism. I was tempted to say "there is no difference" but =
"restart" might have the shade of meaning that "the session has been =
terminated and a new one initiated" whereas "reset" might indicate =
something more like "the session has been terminated and we hope a new =
one will be initiated". Anyway, I'll give it some thought.

> 3. Section 2, 3rd paragraph Why we use a different bit instead =
=C2=A1=C2=B0R=C2=A1=C2=B1
> bit to indicate graceful restart support for BGP notification message.

The R bit already has defined semantics, entirely different from those =
of the N bit. Maybe I haven't understood your question properly.

> 4.
> Section 2, last paragraph Can you give an example what are these new =
parameters
> and how these parameters apply? How these parameters are related to =
relevant
> routes?

Providing such an example is probably beyond the scope of this spec. Is =
the problem that you find the language "Graceful Restart parameters" to =
be not specific enough? It means to refer to the contents of the =
Graceful Restart capability, the point being that if your peer sends you =
a list of GR parameters you only start acting on them when (if!) the =
session transitions to ESTABLISHED. This language was added as the =
result of Bruno DeCraene's review, where he pointed out there might be =
some ambiguity related to a peer offering a new set of parameters that =
would (for example) cause GR-Notification support to be removed, but the =
session never establishing for some other reason (e.g. the wrong AS =
number in the OPEN). In such a case we are saying GR-Notification =
support would NOT be removed because the session related to that =
parameter never established.=20

> 5.Section 3.1 said: =C2=A1=C2=B0 In short, the Hard
>   Reset encapsulates another NOTIFICATION message in its data portion.
>=20
> =C2=A1=C2=B1
> It looks one Notification message is embedded into another =
notification
> message?

Yes.

> Is there any example for that.

No, we didn't provide examples in the doc. My feeling was that the usage =
was clear. If there's consensus that it's not clear without examples we =
could add some of course, although I would like to see such a consensus =
before adding what would inevitably be a long examples section into what =
is now a pretty short doc.

> Also it is not clear to me what do you
> mean by as appropriate for in section 3.1 last paragraph?

Each error code has a list of subcodes that can be used with it. These =
are documented in the IANA registry mentioned in the paragraph you're =
talking about. Basically, this just means that the payload of the Hard =
Reset is itself a properly-formatted NOTIFICATION message.

> Would it be great to
> add more text to explain the usage of subcode or add reference to =
point to
> section 5 and point 5.2.

OK.

> 6.Section 4.1, 2nd paragraph I am wondering whether
> the proposed procedures and rules are back compatible with the =
procedure and
> rule defined in RFC4724?

They're intended to be. In part this is provided by requiring that the N =
bit be exchanged before these procedures are used (which we discussed =
above).

> 7.Section 5.1 Can you provide definition of Graceful
> Cease in the terminology section?

I'll do that, or back the term out and use something like "normal =
cease". Actually I thought I'd provided a definition, I guess I didn't, =
though.

> How Graceful cease is different from Graceful
> restart since I am confused.

The intention was to draw a distinction between a Hard Reset and all =
other Cease messages. "Graceful Cease" in this context is supposed to =
mean "a Cease that isn't a Hard Reset".

Thanks,

--John


From nobody Tue Apr 24 05:13:43 2018
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Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ipv6-rt-constrain-12.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : IPv6 Extensions for Route Target Distribution
        Authors         : Keyur Patel
                          Robert Raszuk
                          Martin Djernaes
                          Jie Dong
                          Mach(Guoyi) Chen
	Filename        : draft-ietf-idr-bgp-ipv6-rt-constrain-12.txt
	Pages           : 6
	Date            : 2018-04-26

Abstract:
   The current route target distribution specification as described in
   [RFC 4684] defines Route Target NLRIs of maximum length of 12 bytes.
   The IPv6 specific Route Target extended community is defined in [RFC
   5701] as length of 20 bytes.  Since the current specification only
   supports prefixes of maximum length of 12 bytes, the lack of an IPv6
   specific Route Target reachability information may be a problem when
   an operator wants to use this application in a pure IPv6 environment.
   This document defines an extension that allows BGP to exchange longer
   length IPv6 Route Target prefixes.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ipv6-rt-constrain/

There are also htmlized versions available at:
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https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ipv6-rt-constrain-12

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-bgp-ipv6-rt-constrain-12


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

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


From nobody Thu Apr 26 05:11:51 2018
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From: "Dongjie (Jimmy)" <jie.dong@huawei.com>
To: "idr@ietf.org" <idr@ietf.org>
CC: "idr-chairs@ietf.org" <idr-chairs@ietf.org>
Thread-Topic: [Idr] I-D Action: draft-ietf-idr-bgp-ipv6-rt-constrain-12.txt
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Hi all,=20

This new version updates the IANA Considerations section following the guid=
ance of the chairs.=20

Best regards,
Jie

> -----Original Message-----
> From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-drafts@ietf=
.org
> Sent: Thursday, April 26, 2018 8:07 PM
> To: i-d-announce@ietf.org
> Cc: idr@ietf.org
> Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ipv6-rt-constrain-12.txt
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts direct=
ories.
> This draft is a work item of the Inter-Domain Routing WG of the IETF.
>=20
>         Title           : IPv6 Extensions for Route Target Distribution
>         Authors         : Keyur Patel
>                           Robert Raszuk
>                           Martin Djernaes
>                           Jie Dong
>                           Mach(Guoyi) Chen
> 	Filename        : draft-ietf-idr-bgp-ipv6-rt-constrain-12.txt
> 	Pages           : 6
> 	Date            : 2018-04-26
>=20
> Abstract:
>    The current route target distribution specification as described in
>    [RFC 4684] defines Route Target NLRIs of maximum length of 12 bytes.
>    The IPv6 specific Route Target extended community is defined in [RFC
>    5701] as length of 20 bytes.  Since the current specification only
>    supports prefixes of maximum length of 12 bytes, the lack of an IPv6
>    specific Route Target reachability information may be a problem when
>    an operator wants to use this application in a pure IPv6 environment.
>    This document defines an extension that allows BGP to exchange longer
>    length IPv6 Route Target prefixes.
>=20
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ipv6-rt-constrain/
>=20
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-idr-bgp-ipv6-rt-constrain-12
> https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ipv6-rt-constrai=
n-12
>=20
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ipv6-rt-constrain-=
12
>=20
>=20
> Please note that it may take a couple of minutes from the time of submiss=
ion
> until the htmlized version and diff are available at tools.ietf.org.
>=20
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>=20
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://www.ietf.org/mailman/listinfo/idr


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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Revised Validation Procedure for BGP Flow Specifications
        Authors         : James Uttaro
                          Juan Alcaide
                          Clarence Filsfils
                          David Smith
                          Pradosh Mohapatra
	Filename        : draft-ietf-idr-bgp-flowspec-oid-06.txt
	Pages           : 9
	Date            : 2018-04-26

Abstract:
   This document describes a modification to the validation procedure
   defined in RFC 5575 for the dissemination of BGP flow specifications.
   RFC 5575 requires that the originator of the flow specification
   matches the originator of the best-match unicast route for the
   destination prefix embedded in the flow specification.  This allows
   only BGP speakers within the data forwarding path (such as autonomous
   system border routers) to originate BGP flow specifications.  Though
   it is possible to disseminate such flow specifications directly from
   border routers, it may be operationally cumbersome in an autonomous
   system with a large number of border routers having complex BGP
   policies.  The modification proposed herein enables flow
   specifications to be originated from a centralized BGP route
   controller.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-flowspec-oid/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-flowspec-oid-06
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-flowspec-oid-06

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-bgp-flowspec-oid-06


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

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


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Subject: [Idr] WGLC for draft-ietf-idr-bgp-flowspec-oid-06
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Hi All,

The authors have requested a working group last call for draft-ietf-idr-bgp=
-flowspec-oid-06. Please respond with your comments before Friday, May 11.

Authors, please reply indicating whether you're aware of any relevant IPR t=
hat hasn't been disclosed. (No IPR is currently listed for this draft, http=
s://datatracker.ietf.org/ipr/search/?submit=3Ddraft&id=3Ddraft-ietf-idr-bgp=
-flowspec-oid).

https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-flowspec-oid

Thanks,

--John=


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From: "Sriram, Kotikalapudi (Fed)" <kotikalapudi.sriram@nist.gov>
To: "sidr wg list (sidr@ietf.org)" <sidr@ietf.org>, "sidrops@ietf.org" <sidrops@ietf.org>, "idr@ietf.org" <idr@ietf.org>
CC: "n.brownlee@auckland.ac.nz" <n.brownlee@auckland.ac.nz>, Adrian Farrel <rfc-ise@rfc-editor.org>, Wes George <wesgeorge@puck.nether.net>, "Jeffrey Haas" <jhaas@pfrc.org>, Alvaro Retana <aretana.ietf@gmail.com>
Thread-Topic: RFC 8374: BGPsec design discussions document published as an Independent Submissions RFC
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Date: Fri, 27 Apr 2018 14:23:11 +0000
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Subject: [Idr] RFC 8374: BGPsec design discussions document published as an Independent Submissions RFC
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In its draft form, the BGPsec design discussions document was=20
found useful and cited many times during sidr/sidrops/idr discussions on BG=
Psec.=20

It is now published as an Independent Submissions RFC:=20
https://tools.ietf.org/html/rfc8374=20

The authors/designers/advocates team wishes to thank=20
the ISEs (Nevil Brownlee - previous and Adrian Farrel - current), Alvaro (r=
outing AD),
the document reviewers Wes George and Jeff Haas, and many other WG members
for their support, reviews, and comments over the course of the work/public=
ation process.   =20
=20
Sriram


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From: "David Smith (djsmith)" <djsmith@cisco.com>
To: John Scudder <jgs@juniper.net>, "idr@ietf. org" <idr@ietf.org>
CC: "draft-ietf-idr-bgp-flowspec-oid@ietf.org" <draft-ietf-idr-bgp-flowspec-oid@ietf.org>
Thread-Topic: WGLC for draft-ietf-idr-bgp-flowspec-oid-06
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Subject: Re: [Idr] WGLC for draft-ietf-idr-bgp-flowspec-oid-06
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I support this draft as co-author and I am unaware of any undisclosed IPR t=
hat applies to this draft.

Regards,

/dave

-----Original Message-----
From: John Scudder <jgs@juniper.net>=20
Sent: Thursday, April 26, 2018 3:59 PM
To: idr@ietf. org <idr@ietf.org>
Cc: draft-ietf-idr-bgp-flowspec-oid@ietf.org
Subject: WGLC for draft-ietf-idr-bgp-flowspec-oid-06

Hi All,

The authors have requested a working group last call for draft-ietf-idr-bgp=
-flowspec-oid-06. Please respond with your comments before Friday, May 11.

Authors, please reply indicating whether you're aware of any relevant IPR t=
hat hasn't been disclosed. (No IPR is currently listed for this draft, http=
s://datatracker.ietf.org/ipr/search/?submit=3Ddraft&id=3Ddraft-ietf-idr-bgp=
-flowspec-oid).

https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-flowspec-oid

Thanks,

--John


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To: "David Smith (djsmith)" <djsmith@cisco.com>, "Juan Alcaide (jalcaide)" <jalcaide@cisco.com>, "ju1738@att.com" <ju1738@att.com>, Pradosh Mohapatra <mpradosh@yahoo.com>, "John G. Scudder" <jgs@juniper.net>, idr@ietf.org, draft-ietf-idr-bgp-flowspec-oid@ietf.org
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Subject: Re: [Idr] FW: WGLC for draft-ietf-idr-bgp-flowspec-oid-06
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John,

I am unaware of any undisclosed IPR that applies to this draft.

Cheers,
Clarence


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From: "UTTARO, JAMES" <ju1738@att.com>
To: "David Smith (djsmith)" <djsmith@cisco.com>, John Scudder <jgs@juniper.net>, "idr@ietf. org" <idr@ietf.org>
CC: "draft-ietf-idr-bgp-flowspec-oid@ietf.org" <draft-ietf-idr-bgp-flowspec-oid@ietf.org>
Thread-Topic: WGLC for draft-ietf-idr-bgp-flowspec-oid-06
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Subject: Re: [Idr] WGLC for draft-ietf-idr-bgp-flowspec-oid-06
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Support as co-author. I am unaware of any undisclosed IPR that applies to t=
his draft..

Thanks
	Jim Uttaro

-----Original Message-----
From: David Smith (djsmith) [mailto:djsmith@cisco.com]=20
Sent: Friday, April 27, 2018 12:03 PM
To: John Scudder <jgs@juniper.net>; idr@ietf. org <idr@ietf.org>
Cc: draft-ietf-idr-bgp-flowspec-oid@ietf.org
Subject: RE: WGLC for draft-ietf-idr-bgp-flowspec-oid-06

I support this draft as co-author and I am unaware of any undisclosed IPR t=
hat applies to this draft.

Regards,

/dave

-----Original Message-----
From: John Scudder <jgs@juniper.net>=20
Sent: Thursday, April 26, 2018 3:59 PM
To: idr@ietf. org <idr@ietf.org>
Cc: draft-ietf-idr-bgp-flowspec-oid@ietf.org
Subject: WGLC for draft-ietf-idr-bgp-flowspec-oid-06

Hi All,

The authors have requested a working group last call for draft-ietf-idr-bgp=
-flowspec-oid-06. Please respond with your comments before Friday, May 11.

Authors, please reply indicating whether you're aware of any relevant IPR t=
hat hasn't been disclosed. (No IPR is currently listed for this draft, http=
s://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ietf.org_ipr=
_search_-3Fsubmit-3Ddraft-26id-3Ddraft-2Dietf-2Didr-2Dbgp-2Dflowspec-2Doid&=
d=3DDwIFAg&c=3DLFYZ-o9_HUMeMTSQicvjIg&r=3D3qhKphE8RnwJQ6u8MrAGeA&m=3DR-40kh=
sxtaSvhpVz1i--T905rn83Maesonjik1Lt_jA&s=3DjOL-l_Lxeac5Tk2rDWxoc8MwQyzV5L28P=
aHsbiCmJUI&e=3D ).

https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ietf.org=
_doc_draft-2Dietf-2Didr-2Dbgp-2Dflowspec-2Doid&d=3DDwIFAg&c=3DLFYZ-o9_HUMeM=
TSQicvjIg&r=3D3qhKphE8RnwJQ6u8MrAGeA&m=3DR-40khsxtaSvhpVz1i--T905rn83Maeson=
jik1Lt_jA&s=3DzHI8GQFsc6FvasP3uanC1qsmn4YZaI87xxOnKfzyOkM&e=3D=20

Thanks,

--John


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To: "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>, "David Smith (djsmith)" <djsmith@cisco.com>, "ju1738@att.com" <ju1738@att.com>, Pradosh Mohapatra <mpradosh@yahoo.com>, "John G. Scudder" <jgs@juniper.net>, idr@ietf.org, draft-ietf-idr-bgp-flowspec-oid@ietf.org
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Subject: Re: [Idr] FW: WGLC for draft-ietf-idr-bgp-flowspec-oid-06
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  I am unaware of any undisclosed IPR that applies to this draft.

-J

On 4/27/2018 6:42 PM, Clarence Filsfils (cfilsfil) wrote:
> John,
>
> I am unaware of any undisclosed IPR that applies to this draft.
>
> Cheers,
> Clarence
>


--------------51EE550BA21FF2F10D9417BD
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<html>
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    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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  <body text="#000000" bgcolor="#FFFFFF">
    <div class="moz-cite-prefix"><font size="2"><span
          style="font-size:10pt;"> I am unaware of any undisclosed IPR
          that applies to this draft.<br>
          <br>
          -J<br>
        </span></font><br>
      On 4/27/2018 6:42 PM, Clarence Filsfils (cfilsfil) wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:526f5610-aa9c-26e9-7c49-b908a3ca14ba@cisco.com">John,
      <br>
      <br>
      I am unaware of any undisclosed IPR that applies to this draft.
      <br>
      <br>
      Cheers,
      <br>
      Clarence
      <br>
      <br>
    </blockquote>
    <p><br>
    </p>
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--------------51EE550BA21FF2F10D9417BD--


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From: Shyam Sethuram <shyam.ioml@gmail.com>
Date: Fri, 27 Apr 2018 11:15:19 -0700
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To: John Scudder <jgs@juniper.net>
Cc: "idr@ietf. org" <idr@ietf.org>, "draft-ietf-idr-bgp-flowspec-oid@ietf.org" <draft-ietf-idr-bgp-flowspec-oid@ietf.org>
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I support this draft.

thanks--shyam

On Thu, Apr 26, 2018 at 12:58 PM, John Scudder <jgs@juniper.net> wrote:

> Hi All,
>
> The authors have requested a working group last call for
> draft-ietf-idr-bgp-flowspec-oid-06. Please respond with your comments
> before Friday, May 11.
>
> Authors, please reply indicating whether you're aware of any relevant IPR
> that hasn't been disclosed. (No IPR is currently listed for this draft,
> https://datatracker.ietf.org/ipr/search/?submit=draft&id=
> draft-ietf-idr-bgp-flowspec-oid).
>
> https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-flowspec-oid
>
> Thanks,
>
> --John
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://www.ietf.org/mailman/listinfo/idr
>

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<div dir=3D"ltr"><div>I support this draft.</div><div><br></div><div>thanks=
--shyam</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote=
">On Thu, Apr 26, 2018 at 12:58 PM, John Scudder <span dir=3D"ltr">&lt;<a h=
ref=3D"mailto:jgs@juniper.net" target=3D"_blank">jgs@juniper.net</a>&gt;</s=
pan> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex=
;border-left:1px #ccc solid;padding-left:1ex">Hi All,<br>
<br>
The authors have requested a working group last call for draft-ietf-idr-bgp=
-flowspec-<wbr>oid-06. Please respond with your comments before Friday, May=
 11.<br>
<br>
Authors, please reply indicating whether you&#39;re aware of any relevant I=
PR that hasn&#39;t been disclosed. (No IPR is currently listed for this dra=
ft, <a href=3D"https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&amp;=
id=3Ddraft-ietf-idr-bgp-flowspec-oid" target=3D"_blank" rel=3D"noreferrer">=
https://datatracker.ietf.org/<wbr>ipr/search/?submit=3Ddraft&amp;id=3D<wbr>=
draft-ietf-idr-bgp-flowspec-<wbr>oid</a>).<br>
<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-flowspec-oid=
" target=3D"_blank" rel=3D"noreferrer">https://datatracker.ietf.org/<wbr>do=
c/draft-ietf-idr-bgp-<wbr>flowspec-oid</a><br>
<br>
Thanks,<br>
<br>
--John<br>
______________________________<wbr>_________________<br>
Idr mailing list<br>
<a href=3D"mailto:Idr@ietf.org">Idr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/idr" target=3D"_blank" rel=
=3D"noreferrer">https://www.ietf.org/mailman/<wbr>listinfo/idr</a><br>
</blockquote></div><br></div>

--000000000000a7e677056ad87c34--


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From: "David Smith (djsmith)" <djsmith@cisco.com>
To: PVLR Pavana Murthy <pvlrpm@gmail.com>
CC: idr wg <idr@ietf.org>, Pradosh Mohapatra <mpradosh@yahoo.com>, "draft-ietf-idr-flowspec-redirect-ip@ietf.org" <draft-ietf-idr-flowspec-redirect-ip@ietf.org>, "draft-ietf-idr-bgp-flowspec-oid@ietf.org" <draft-ietf-idr-bgp-flowspec-oid@ietf.org>
Thread-Topic: Validation for BGP Flow-Spec Redirect to IP Action
Thread-Index: AQHT0uuAIyyPj6TSKkC7hpPOOBsfrqQVHkWA
Date: Fri, 27 Apr 2018 22:07:13 +0000
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Subject: Re: [Idr] Validation for BGP Flow-Spec Redirect to IP Action
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From: PVLR Pavana Murthy <pvlrpm@gmail.com>
Date: Sat, 28 Apr 2018 10:10:26 +0530
Message-ID: <CAN-MQG6R_LCLAM5xgaak3W_oRkuQFQsgZtEodacpeiLCQV8p-g@mail.gmail.com>
To: "David Smith (djsmith)" <djsmith@cisco.com>
Cc: idr wg <idr@ietf.org>, Pradosh Mohapatra <mpradosh@yahoo.com>,  "draft-ietf-idr-flowspec-redirect-ip@ietf.org" <draft-ietf-idr-flowspec-redirect-ip@ietf.org>,  "draft-ietf-idr-bgp-flowspec-oid@ietf.org" <draft-ietf-idr-bgp-flowspec-oid@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/P3-JqmdJM01xR9qUkB6Cu7feICM>
Subject: Re: [Idr] Validation for BGP Flow-Spec Redirect to IP Action
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Hi Dave,
   Thanks for the reply and including respective draft author aliases.

I went through the latest draft-ietf-idr-bgp-flowspec-oid-06. It calls the
first AS the Origin AS. Is it so?
If that's the case, the validation will fail for any 'redirect IP' actions
coming from the AS other than neighbor AS. Is that the intention?
Also In  draft-ietf-idr-flowspec-redirect-ip-00.txt, instead of 'origin
AS', the word 'last AS' is used.It is confusing.   Does the validation need
to consider the first AS or last AS?

Regarding my second doubt, I could not get any pointers from  d
raft-ietf-idr-bgp-flowspec-oid-06 .  Do we need to consider only BGP routes
always?

Thanks,
Pavana.


On Sat, Apr 28, 2018 at 3:37 AM, David Smith (djsmith) <djsmith@cisco.com>
wrote:

> Hi Pavana,
>
>
>
> Your points are valid. With that said, I=E2=80=99ll defer you to d
> raft-ietf-idr-bgp-flowspec-oid-05 (and later) and, specifically, section
> 4 (revised validation procedure) which addresses your points below.
>
>
>
> Co-incidentally, a WG last call was issued for d
> raft-ietf-idr-bgp-flowspec-oid-06 yesterday.
>
>
>
> Regards,
>
>
>
> /dave
>
>
>
>
>
> *From:* PVLR Pavana Murthy <pvlrpm@gmail.com>
> *Sent:* Friday, April 13, 2018 1:51 AM
> *To:* idr wg <idr@ietf.org>; pmohapat@cumulusnetworks.com; David Smith
> (djsmith) <djsmith@cisco.com>
> *Subject:* Validation for BGP Flow-Spec Redirect to IP Action
>
>
>
> Hello,
>
>   In the draft  draft-ietf-idr-flowspec-redirect-ip-02.txt, the following
> procedure is mentioned to validate the extended community of 'Flowspec
>
> redirect to IP'.
>
>
>
>
>
>    BGP speakers that support the extended communities defined in this
>
>    draft MUST also, by default, enforce the following check when
>
>    receiving a flow-spec route from an EBGP peer: if the received flow-
>
>    spec route has a 'redirect to IP' extended community with a 'target
>
>    address' X (in the global administrator field) and the best matching
>
>    route to X is not a BGP route with *origin AS* matching the peer AS
>
>    then the extended community should be discarded and not propagated
>
>    along with the flow-spec route to other peers.
>
>
>
> *I have 2 doubts related to this statement.*
>
>
>
> *What is 'origin AS' here? Is it the AS no. that is first added to the AS=
_PATH? *
> *In the previous version of the draft its mentioned as the last AS in the=
 AS_PATH.*
> *Is it the last AS no. that has been added to the AS_PATH or the last AS =
no. from left in AS_PATH? *
>
>
>
> *What if the redirect target X is directly connected or reachable by a st=
atic route and its not advertised by EBGP?*
>
> *Do we need to consider that action invalid in that case?*
>
>
>
>
>
> Thanks,
>
> Pavana.
>
>
>
>
>
>
>

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<div dir=3D"ltr">Hi Dave,<div>=C2=A0 =C2=A0Thanks for the reply and includi=
ng respective draft author aliases.=C2=A0=C2=A0</div><div><br></div><div>I =
went through the latest=20

<span style=3D"color:rgb(34,34,34);font-style:normal;font-variant-ligatures=
:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text=
-align:start;text-indent:0px;text-transform:none;white-space:normal;word-sp=
acing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;t=
ext-decoration-color:initial;font-size:11pt;font-family:Calibri,sans-serif"=
>d</span><span style=3D"color:rgb(34,34,34);font-style:normal;font-variant-=
ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:no=
rmal;text-align:start;text-indent:0px;text-transform:none;white-space:norma=
l;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:=
initial;text-decoration-color:initial;font-size:11pt;font-family:Calibri,sa=
ns-serif">raft-ietf-idr-bgp-flowspec-<wbr>oid-06. It calls the first AS the=
 Origin AS. Is it so?=C2=A0</span></div><div><span style=3D"color:rgb(34,34=
,34);font-style:normal;font-variant-ligatures:normal;font-variant-caps:norm=
al;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;t=
ext-transform:none;white-space:normal;word-spacing:0px;background-color:rgb=
(255,255,255);text-decoration-style:initial;text-decoration-color:initial;f=
ont-size:11pt;font-family:Calibri,sans-serif">If that&#39;s the case, the v=
alidation will fail for any &#39;redirect IP&#39; actions coming from the A=
S other than neighbor AS. Is that the intention?</span></div><div><span sty=
le=3D"color:rgb(34,34,34);font-style:normal;font-variant-ligatures:normal;f=
ont-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:st=
art;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px=
;background-color:rgb(255,255,255);text-decoration-style:initial;text-decor=
ation-color:initial;font-size:11pt;font-family:Calibri,sans-serif">Also In=
=C2=A0=C2=A0draft-ietf-idr-flowspec-redirect-ip-00.txt, instead of &#39;ori=
gin AS&#39;, the word &#39;last AS&#39; is used.It is confusing.=C2=A0 =C2=
=A0Does the validation need to consider the first AS or last AS?=C2=A0</spa=
n></div><div><span style=3D"color:rgb(34,34,34);font-style:normal;font-vari=
ant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacin=
g:normal;text-align:start;text-indent:0px;text-transform:none;white-space:n=
ormal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-st=
yle:initial;text-decoration-color:initial;font-size:11pt;font-family:Calibr=
i,sans-serif"><br></span></div><div><span style=3D"color:rgb(34,34,34);font=
-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-w=
eight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-trans=
form:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,=
255);text-decoration-style:initial;text-decoration-color:initial;font-size:=
11pt;font-family:Calibri,sans-serif">Regarding my second doubt, I could not=
 get any pointers from=C2=A0

<span style=3D"color:rgb(34,34,34);font-style:normal;font-variant-ligatures=
:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text=
-align:start;text-indent:0px;text-transform:none;white-space:normal;word-sp=
acing:0px;text-decoration-style:initial;text-decoration-color:initial;backg=
round-color:rgb(255,255,255);font-size:11pt;font-family:Calibri,sans-serif"=
>d</span><span style=3D"color:rgb(34,34,34);font-style:normal;font-variant-=
ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:no=
rmal;text-align:start;text-indent:0px;text-transform:none;white-space:norma=
l;word-spacing:0px;text-decoration-style:initial;text-decoration-color:init=
ial;background-color:rgb(255,255,255);font-size:11pt;font-family:Calibri,sa=
ns-serif">raft-ietf-idr-bgp-flowspec-<wbr>oid-06</span>=C2=A0.=C2=A0 Do we =
need to consider only BGP routes always?</span></div><div><span style=3D"co=
lor:rgb(34,34,34);font-style:normal;font-variant-ligatures:normal;font-vari=
ant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text=
-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;backgro=
und-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-co=
lor:initial;font-size:11pt;font-family:Calibri,sans-serif"><br></span></div=
><div><span style=3D"color:rgb(34,34,34);font-style:normal;font-variant-lig=
atures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:norma=
l;text-align:start;text-indent:0px;text-transform:none;white-space:normal;w=
ord-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:ini=
tial;text-decoration-color:initial;font-size:11pt;font-family:Calibri,sans-=
serif">Thanks,</span></div><div><span style=3D"color:rgb(34,34,34);font-sty=
le:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weigh=
t:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform=
:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255)=
;text-decoration-style:initial;text-decoration-color:initial;font-size:11pt=
;font-family:Calibri,sans-serif">Pavana.<br>

=C2=A0</span></div></div><div class=3D"gmail_extra"><br><div class=3D"gmail=
_quote">On Sat, Apr 28, 2018 at 3:37 AM, David Smith (djsmith) <span dir=3D=
"ltr">&lt;<a href=3D"mailto:djsmith@cisco.com" target=3D"_blank">djsmith@ci=
sco.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D=
"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_7014693062375135500WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">Hi Pavana,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">Your points are valid. With that said, I=E2=80=99ll=
 defer you to d</span><span style=3D"font-size:11.0pt;font-family:&quot;Cal=
ibri&quot;,sans-serif">raft-ietf-idr-bgp-flowspec-<wbr>oid-05 (and later)
 and, specifically, section 4 (revised validation procedure) which addresse=
s your points below.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">Co-incidentally, a WG last call was issued for
</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans=
-serif">d</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&q=
uot;,sans-serif">raft-ietf-idr-bgp-flowspec-<wbr>oid-06 yesterday.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">Regards,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">/dave</span><span style=3D"font-size:11.0pt;font-fa=
mily:&quot;Calibri&quot;,sans-serif"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> PVLR Pavana Murthy &lt;<a href=
=3D"mailto:pvlrpm@gmail.com" target=3D"_blank">pvlrpm@gmail.com</a>&gt;
<br>
<b>Sent:</b> Friday, April 13, 2018 1:51 AM<br>
<b>To:</b> idr wg &lt;<a href=3D"mailto:idr@ietf.org" target=3D"_blank">idr=
@ietf.org</a>&gt;; <a href=3D"mailto:pmohapat@cumulusnetworks.com" target=
=3D"_blank">pmohapat@cumulusnetworks.com</a>; David Smith (djsmith) &lt;<a =
href=3D"mailto:djsmith@cisco.com" target=3D"_blank">djsmith@cisco.com</a>&g=
t;<br>
<b>Subject:</b> Validation for BGP Flow-Spec Redirect to IP Action<u></u><u=
></u></span></p><div><div class=3D"h5">
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Tahoma&quot;,sans-s=
erif">Hello,</span><u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Tahoma&quot;,sans-s=
erif">=C2=A0 In the draft=C2=A0</span><span style=3D"font-size:18.0pt;font-=
family:&quot;Tahoma&quot;,sans-serif">=C2=A0</span><span style=3D"font-fami=
ly:&quot;Tahoma&quot;,sans-serif;color:black">draft-ietf-idr-<wbr>flowspec-=
redirect-ip-02.txt,
 the following procedure is mentioned to validate the extended community of=
 &#39;Flowspec
</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Tahoma&quot;,sans-s=
erif;color:black">redirect to IP&#39;.</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span style=3D"font-size:18.0pt;font-family:&quot=
;Courier New&quot;;color:black"><u></u>=C2=A0<u></u></span></b></p>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"color:black">=C2=A0=C2=A0 BGP speakers that su=
pport the extended communities defined in this<u></u><u></u></span></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0 draft MUST also, by default, =
enforce the following check when<u></u><u></u></span></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0 receiving a flow-spec route f=
rom an EBGP peer: if the received flow-<u></u><u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"color:black">=C2=A0=C2=A0 spec route has a &#3=
9;redirect to IP&#39; extended community with a &#39;target<u></u><u></u></=
span></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0 address&#39; X (in the global=
 administrator field) and the best matching<u></u><u></u></span></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0 route to X is not a BGP route=
 with <b>origin AS</b> matching the peer AS<u></u><u></u></span></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0 then the extended community s=
hould be discarded and not propagated<u></u><u></u></span></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0 along with the flow-spec rout=
e to other peers. <u></u><u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"color:black"><u></u>=C2=A0<u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><b><span style=3D"color:black">I have 2 doubts related to thi=
s statement.</span></b><span style=3D"color:black"><u></u><u></u></span></p=
re>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"color:black"><u></u>=C2=A0<u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><b><span style=3D"color:black">What is &#39;origin AS&#39; he=
re? Is it the AS no. that is first added to the AS_PATH? </span></b><span s=
tyle=3D"color:black"><br><b>In the previous version of the draft its mentio=
ned as the last AS in the AS_PATH.</b><br><b>Is it the last AS no. that has=
 been added to the AS_PATH or the last AS no. from left in AS_PATH? </b><u>=
</u><u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"color:black"><u></u>=C2=A0<u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><b><span style=3D"color:black">What if the redirect target X =
is directly connected or reachable by a static route and its not advertised=
 by EBGP?</span></b><span style=3D"color:black"><u></u><u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><b><span style=3D"color:black">Do we need to consider that ac=
tion invalid in that case?</span></b><span style=3D"color:black"><u></u><u>=
</u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"color:black"><u></u>=C2=A0<u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"color:black"><u></u>=C2=A0<u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"font-family:&quot;Tahoma&quot;,sans-serif;colo=
r:black">Thanks,</span><span style=3D"color:black"><u></u><u></u></span></p=
re>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"font-family:&quot;Tahoma&quot;,sans-serif;colo=
r:black">Pavana.</span><span style=3D"color:black"><u></u><u></u></span></p=
re>
<p class=3D"MsoNormal"><b><span style=3D"font-size:18.0pt;font-family:&quot=
;Courier New&quot;;color:black"><u></u>=C2=A0<u></u></span></b></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span style=3D"font-size:13.5pt;font-family:&quot=
;Courier New&quot;;color:black"><u></u>=C2=A0<u></u></span></b></p>
</div>
</div>
</div></div></div>
</div>

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

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From: PVLR Pavana Murthy <pvlrpm@gmail.com>
Date: Sat, 28 Apr 2018 10:15:45 +0530
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To: "David Smith (djsmith)" <djsmith@cisco.com>
Cc: idr wg <idr@ietf.org>, Pradosh Mohapatra <mpradosh@yahoo.com>,  "draft-ietf-idr-bgp-flowspec-oid@ietf.org" <draft-ietf-idr-bgp-flowspec-oid@ietf.org>, ju1738@att.com,  jhaas@juniper.net, akarch@cisco.com, sairay@cisco.com,  pmohapat@cumulusnetworks.com, wim.henderickx@alcatel-lucent.be,  adam.simpson@alcatel-lucent.com, mtexier@arbor.net
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Subject: Re: [Idr] Validation for BGP Flow-Spec Redirect to IP Action
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Hello,
  Including all the authors mentioned
in draft-ietf-idr-flowspec-redirect-ip-02, as the alias did not work. Also
pasting doubts again here.

In the draft  draft-ietf-idr-flowspec-redirect-ip-02.txt, the following
procedure is mentioned to validate the extended community of 'Flowspec
redirect to IP'.

   BGP speakers that support the extended communities defined in this
   draft MUST also, by default, enforce the following check when
   receiving a flow-spec route from an EBGP peer: if the received flow-

   spec route has a 'redirect to IP' extended community with a 'target
   address' X (in the global administrator field) and the best matching
   route to X is not a BGP route with *origin AS* matching the peer AS
   then the extended community should be discarded and not propagated
   along with the flow-spec route to other peers.


*I have 2 doubts related to this statement.*


*What is 'origin AS' here? Is it the AS no. that is first added to the
AS_PATH? *
*In the previous version of the draft its mentioned as the last AS in
the AS_PATH.*
*Is it the last AS no. that has been added to the AS_PATH or the last
AS no. from left in AS_PATH? *


*What if the redirect target X is directly connected or reachable by a
static route and its not advertised by EBGP?*

*Do we need to consider that action invalid in that case?*


Thanks,
Pavana.


On Sat, Apr 28, 2018 at 10:10 AM, PVLR Pavana Murthy <pvlrpm@gmail.com>
wrote:

> Hi Dave,
>    Thanks for the reply and including respective draft author aliases.
>
> I went through the latest draft-ietf-idr-bgp-flowspec-oid-06. It calls
> the first AS the Origin AS. Is it so?
> If that's the case, the validation will fail for any 'redirect IP' action=
s
> coming from the AS other than neighbor AS. Is that the intention?
> Also In  draft-ietf-idr-flowspec-redirect-ip-00.txt, instead of 'origin
> AS', the word 'last AS' is used.It is confusing.   Does the validation ne=
ed
> to consider the first AS or last AS?
>
> Regarding my second doubt, I could not get any pointers from  d
> raft-ietf-idr-bgp-flowspec-oid-06 .  Do we need to consider only BGP
> routes always?
>
> Thanks,
> Pavana.
>
>
> On Sat, Apr 28, 2018 at 3:37 AM, David Smith (djsmith) <djsmith@cisco.com=
>
> wrote:
>
>> Hi Pavana,
>>
>>
>>
>> Your points are valid. With that said, I=E2=80=99ll defer you to d
>> raft-ietf-idr-bgp-flowspec-oid-05 (and later) and, specifically, section
>> 4 (revised validation procedure) which addresses your points below.
>>
>>
>>
>> Co-incidentally, a WG last call was issued for d
>> raft-ietf-idr-bgp-flowspec-oid-06 yesterday.
>>
>>
>>
>> Regards,
>>
>>
>>
>> /dave
>>
>>
>>
>>
>>
>> *From:* PVLR Pavana Murthy <pvlrpm@gmail.com>
>> *Sent:* Friday, April 13, 2018 1:51 AM
>> *To:* idr wg <idr@ietf.org>; pmohapat@cumulusnetworks.com; David Smith
>> (djsmith) <djsmith@cisco.com>
>> *Subject:* Validation for BGP Flow-Spec Redirect to IP Action
>>
>>
>>
>> Hello,
>>
>>   In the draft  draft-ietf-idr-flowspec-redirect-ip-02.txt, the
>> following procedure is mentioned to validate the extended community of
>> 'Flowspec
>>
>> redirect to IP'.
>>
>>
>>
>>
>>
>>    BGP speakers that support the extended communities defined in this
>>
>>    draft MUST also, by default, enforce the following check when
>>
>>    receiving a flow-spec route from an EBGP peer: if the received flow-
>>
>>    spec route has a 'redirect to IP' extended community with a 'target
>>
>>    address' X (in the global administrator field) and the best matching
>>
>>    route to X is not a BGP route with *origin AS* matching the peer AS
>>
>>    then the extended community should be discarded and not propagated
>>
>>    along with the flow-spec route to other peers.
>>
>>
>>
>> *I have 2 doubts related to this statement.*
>>
>>
>>
>> *What is 'origin AS' here? Is it the AS no. that is first added to the A=
S_PATH? *
>> *In the previous version of the draft its mentioned as the last AS in th=
e AS_PATH.*
>> *Is it the last AS no. that has been added to the AS_PATH or the last AS=
 no. from left in AS_PATH? *
>>
>>
>>
>> *What if the redirect target X is directly connected or reachable by a s=
tatic route and its not advertised by EBGP?*
>>
>> *Do we need to consider that action invalid in that case?*
>>
>>
>>
>>
>>
>> Thanks,
>>
>> Pavana.
>>
>>
>>
>>
>>
>>
>>
>
>

--000000000000361956056ae14be7
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hello,<div>=C2=A0 Including all the authors mentioned in=
=C2=A0draft-ietf-idr-flowspec-redirect-ip-02, as the alias did not work. Al=
so pasting doubts again here.</div><div><br></div><div>

<div><font face=3D"tahoma, sans-serif">In the draft=C2=A0<font style=3D"fon=
t-size:large">=C2=A0</font><span style=3D"white-space:pre-wrap;color:rgb(0,=
0,0)">draft-ietf-idr-<wbr>flowspec-redirect-ip-02.txt, </span><span style=
=3D"color:rgb(0,0,0);white-space:pre-wrap">the following procedure is menti=
oned to validate the extended community of &#39;Flowspec </span></font></di=
v><div><span style=3D"color:rgb(0,0,0);white-space:pre-wrap"><font face=3D"=
tahoma, sans-serif">redirect to IP&#39;.</font></span></div><div><br></div>=
<div><span style=3D"color:rgb(0,0,0);white-space:pre-wrap;font-size:large">=
<b style=3D"color:rgb(0,0,0);font-style:normal;font-variant-ligatures:norma=
l;font-variant-caps:normal;letter-spacing:normal;text-align:start;text-inde=
nt:0px;text-transform:none;white-space:pre-wrap;word-spacing:0px;background=
-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color=
:initial;font-family:monospace">
</b><pre class=3D"gmail-m_-5527784508216607126gmail-newpage" style=3D"white=
-space:pre-wrap;color:rgb(0,0,0);font-style:normal;font-variant-ligatures:n=
ormal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-a=
lign:start;text-indent:0px;text-transform:none;word-spacing:0px;background-=
color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:=
initial;font-family:monospace;font-size:13.3333px;margin-top:0px;margin-bot=
tom:0px">   BGP speakers that support the extended communities defined in t=
his
   draft MUST also, by default, enforce the following check when
   receiving a flow-spec route from an EBGP peer: if the received flow-
</pre><pre class=3D"gmail-m_-5527784508216607126gmail-newpage" style=3D"whi=
te-space:pre-wrap;color:rgb(0,0,0);font-style:normal;font-variant-ligatures=
:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text=
-align:start;text-indent:0px;text-transform:none;word-spacing:0px;backgroun=
d-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-colo=
r:initial;font-family:monospace;font-size:13.3333px;margin-top:0px;margin-b=
ottom:0px"><span style=3D"font-weight:400">   spec route has a &#39;redirec=
t to IP&#39; extended community with a &#39;target
   address&#39; X (in the global administrator field) and the best matching
   route to X is not a BGP route with </span><b>origin AS</b> matching the =
peer AS
   then the extended community should be discarded and not propagated
   along with the flow-spec route to other peers. </pre><pre class=3D"gmail=
-m_-5527784508216607126gmail-newpage" style=3D"white-space:pre-wrap;color:r=
gb(0,0,0);font-style:normal;font-variant-ligatures:normal;font-variant-caps=
:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:=
0px;text-transform:none;word-spacing:0px;background-color:rgb(255,255,255);=
text-decoration-style:initial;text-decoration-color:initial;font-family:mon=
ospace;font-size:13.3333px;margin-top:0px;margin-bottom:0px"><br></pre><pre=
 class=3D"gmail-m_-5527784508216607126gmail-newpage" style=3D"white-space:p=
re-wrap;color:rgb(0,0,0);font-style:normal;font-variant-ligatures:normal;fo=
nt-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:sta=
rt;text-indent:0px;text-transform:none;word-spacing:0px;background-color:rg=
b(255,255,255);text-decoration-style:initial;text-decoration-color:initial;=
font-family:monospace;font-size:13.3333px;margin-top:0px;margin-bottom:0px"=
><b>I have 2 doubts related to this statement.</b></pre><pre class=3D"gmail=
-m_-5527784508216607126gmail-newpage" style=3D"white-space:pre-wrap;color:r=
gb(0,0,0);font-style:normal;font-variant-ligatures:normal;font-variant-caps=
:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:=
0px;text-transform:none;word-spacing:0px;background-color:rgb(255,255,255);=
text-decoration-style:initial;text-decoration-color:initial;font-family:mon=
ospace;font-size:13.3333px;margin-top:0px;margin-bottom:0px"><br></pre><pre=
 class=3D"gmail-m_-5527784508216607126gmail-newpage" style=3D"white-space:p=
re-wrap;color:rgb(0,0,0);font-style:normal;font-variant-ligatures:normal;fo=
nt-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:sta=
rt;text-indent:0px;text-transform:none;word-spacing:0px;background-color:rg=
b(255,255,255);text-decoration-style:initial;text-decoration-color:initial;=
font-family:monospace;font-size:13.3333px;margin-top:0px;margin-bottom:0px"=
><b>What is &#39;origin AS&#39; here? Is it the AS no. that is first added =
to the AS_PATH? </b><br><b>In the previous version of the draft its mention=
ed as the last AS in the AS_PATH.</b><br><b>Is it the last AS no. that has =
been added to the AS_PATH or the last AS no. from left in AS_PATH? </b><br>=
</pre><pre class=3D"gmail-m_-5527784508216607126gmail-newpage" style=3D"whi=
te-space:pre-wrap;color:rgb(0,0,0);font-style:normal;font-variant-ligatures=
:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text=
-align:start;text-indent:0px;text-transform:none;word-spacing:0px;backgroun=
d-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-colo=
r:initial;font-family:monospace;font-size:13.3333px;margin-top:0px;margin-b=
ottom:0px"><b><br></b></pre><pre class=3D"gmail-m_-5527784508216607126gmail=
-newpage" style=3D"white-space:pre-wrap;color:rgb(0,0,0);font-style:normal;=
font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;lett=
er-spacing:normal;text-align:start;text-indent:0px;text-transform:none;word=
-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initia=
l;text-decoration-color:initial;font-family:monospace;font-size:13.3333px;m=
argin-top:0px;margin-bottom:0px"><b>What if the redirect target X is direct=
ly connected or reachable by a static route and its not advertised by EBGP?=
</b></pre><pre class=3D"gmail-m_-5527784508216607126gmail-newpage" style=3D=
"white-space:pre-wrap;color:rgb(0,0,0);font-style:normal;font-variant-ligat=
ures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;=
text-align:start;text-indent:0px;text-transform:none;word-spacing:0px;backg=
round-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-=
color:initial;font-family:monospace;font-size:13.3333px;margin-top:0px;marg=
in-bottom:0px"><b>Do we need to consider that action invalid in that case?<=
/b></pre><br class=3D"gmail-Apple-interchange-newline">

</span></div>Thanks,</div><div>Pavana.</div><div><br></div></div><div class=
=3D"gmail_extra"><br><div class=3D"gmail_quote">On Sat, Apr 28, 2018 at 10:=
10 AM, PVLR Pavana Murthy <span dir=3D"ltr">&lt;<a href=3D"mailto:pvlrpm@gm=
ail.com" target=3D"_blank">pvlrpm@gmail.com</a>&gt;</span> wrote:<br><block=
quote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc=
 solid;padding-left:1ex"><div dir=3D"ltr">Hi Dave,<div>=C2=A0 =C2=A0Thanks =
for the reply and including respective draft author aliases.=C2=A0=C2=A0</d=
iv><div><br></div><div>I went through the latest=20

<span style=3D"color:rgb(34,34,34);font-style:normal;font-variant-ligatures=
:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text=
-align:start;text-indent:0px;text-transform:none;white-space:normal;word-sp=
acing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;t=
ext-decoration-color:initial;font-size:11pt;font-family:Calibri,sans-serif"=
>d</span><span style=3D"color:rgb(34,34,34);font-style:normal;font-variant-=
ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:no=
rmal;text-align:start;text-indent:0px;text-transform:none;white-space:norma=
l;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:=
initial;text-decoration-color:initial;font-size:11pt;font-family:Calibri,sa=
ns-serif">raft-ietf-idr-bgp-flowspec-oi<wbr>d-06. It calls the first AS the=
 Origin AS. Is it so?=C2=A0</span></div><div><span style=3D"color:rgb(34,34=
,34);font-style:normal;font-variant-ligatures:normal;font-variant-caps:norm=
al;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;t=
ext-transform:none;white-space:normal;word-spacing:0px;background-color:rgb=
(255,255,255);text-decoration-style:initial;text-decoration-color:initial;f=
ont-size:11pt;font-family:Calibri,sans-serif">If that&#39;s the case, the v=
alidation will fail for any &#39;redirect IP&#39; actions coming from the A=
S other than neighbor AS. Is that the intention?</span></div><div><span sty=
le=3D"color:rgb(34,34,34);font-style:normal;font-variant-ligatures:normal;f=
ont-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:st=
art;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px=
;background-color:rgb(255,255,255);text-decoration-style:initial;text-decor=
ation-color:initial;font-size:11pt;font-family:Calibri,sans-serif">Also In=
=C2=A0=C2=A0draft-ietf-idr-flowspec-<wbr>redirect-ip-00.txt, instead of &#3=
9;origin AS&#39;, the word &#39;last AS&#39; is used.It is confusing.=C2=A0=
 =C2=A0Does the validation need to consider the first AS or last AS?=C2=A0<=
/span></div><div><span style=3D"color:rgb(34,34,34);font-style:normal;font-=
variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-sp=
acing:normal;text-align:start;text-indent:0px;text-transform:none;white-spa=
ce:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoratio=
n-style:initial;text-decoration-color:initial;font-size:11pt;font-family:Ca=
libri,sans-serif"><br></span></div><div><span style=3D"color:rgb(34,34,34);=
font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;fo=
nt-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-t=
ransform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,=
255,255);text-decoration-style:initial;text-decoration-color:initial;font-s=
ize:11pt;font-family:Calibri,sans-serif">Regarding my second doubt, I could=
 not get any pointers from=C2=A0

<span style=3D"color:rgb(34,34,34);font-style:normal;font-variant-ligatures=
:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text=
-align:start;text-indent:0px;text-transform:none;white-space:normal;word-sp=
acing:0px;text-decoration-style:initial;text-decoration-color:initial;backg=
round-color:rgb(255,255,255);font-size:11pt;font-family:Calibri,sans-serif"=
>d</span><span style=3D"color:rgb(34,34,34);font-style:normal;font-variant-=
ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:no=
rmal;text-align:start;text-indent:0px;text-transform:none;white-space:norma=
l;word-spacing:0px;text-decoration-style:initial;text-decoration-color:init=
ial;background-color:rgb(255,255,255);font-size:11pt;font-family:Calibri,sa=
ns-serif">raft-ietf-idr-bgp-flowspec-oi<wbr>d-06</span>=C2=A0.=C2=A0 Do we =
need to consider only BGP routes always?</span></div><div><span style=3D"co=
lor:rgb(34,34,34);font-style:normal;font-variant-ligatures:normal;font-vari=
ant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text=
-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;backgro=
und-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-co=
lor:initial;font-size:11pt;font-family:Calibri,sans-serif"><br></span></div=
><div><span style=3D"color:rgb(34,34,34);font-style:normal;font-variant-lig=
atures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:norma=
l;text-align:start;text-indent:0px;text-transform:none;white-space:normal;w=
ord-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:ini=
tial;text-decoration-color:initial;font-size:11pt;font-family:Calibri,sans-=
serif">Thanks,</span></div><div><span style=3D"color:rgb(34,34,34);font-sty=
le:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weigh=
t:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform=
:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255)=
;text-decoration-style:initial;text-decoration-color:initial;font-size:11pt=
;font-family:Calibri,sans-serif">Pavana.<br>

=C2=A0</span></div></div><div class=3D"HOEnZb"><div class=3D"h5"><div class=
=3D"gmail_extra"><br><div class=3D"gmail_quote">On Sat, Apr 28, 2018 at 3:3=
7 AM, David Smith (djsmith) <span dir=3D"ltr">&lt;<a href=3D"mailto:djsmith=
@cisco.com" target=3D"_blank">djsmith@cisco.com</a>&gt;</span> wrote:<br><b=
lockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px =
#ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-8817931134186667405m_7014693062375135500WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">Hi Pavana,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">Your points are valid. With that said, I=E2=80=99ll=
 defer you to d</span><span style=3D"font-size:11.0pt;font-family:&quot;Cal=
ibri&quot;,sans-serif">raft-ietf-idr-bgp-flowspec-oi<wbr>d-05 (and later)
 and, specifically, section 4 (revised validation procedure) which addresse=
s your points below.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">Co-incidentally, a WG last call was issued for
</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans=
-serif">d</span><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&q=
uot;,sans-serif">raft-ietf-idr-bgp-flowspec-oi<wbr>d-06 yesterday.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">Regards,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">/dave</span><span style=3D"font-size:11.0pt;font-fa=
mily:&quot;Calibri&quot;,sans-serif"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> PVLR Pavana Murthy &lt;<a href=
=3D"mailto:pvlrpm@gmail.com" target=3D"_blank">pvlrpm@gmail.com</a>&gt;
<br>
<b>Sent:</b> Friday, April 13, 2018 1:51 AM<br>
<b>To:</b> idr wg &lt;<a href=3D"mailto:idr@ietf.org" target=3D"_blank">idr=
@ietf.org</a>&gt;; <a href=3D"mailto:pmohapat@cumulusnetworks.com" target=
=3D"_blank">pmohapat@cumulusnetworks.com</a>; David Smith (djsmith) &lt;<a =
href=3D"mailto:djsmith@cisco.com" target=3D"_blank">djsmith@cisco.com</a>&g=
t;<br>
<b>Subject:</b> Validation for BGP Flow-Spec Redirect to IP Action<u></u><u=
></u></span></p><div><div class=3D"m_-8817931134186667405h5">
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Tahoma&quot;,sans-s=
erif">Hello,</span><u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Tahoma&quot;,sans-s=
erif">=C2=A0 In the draft=C2=A0</span><span style=3D"font-size:18.0pt;font-=
family:&quot;Tahoma&quot;,sans-serif">=C2=A0</span><span style=3D"font-fami=
ly:&quot;Tahoma&quot;,sans-serif;color:black">draft-ietf-idr-flowspec<wbr>-=
redirect-ip-02.txt,
 the following procedure is mentioned to validate the extended community of=
 &#39;Flowspec
</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Tahoma&quot;,sans-s=
erif;color:black">redirect to IP&#39;.</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span style=3D"font-size:18.0pt;font-family:&quot=
;Courier New&quot;;color:black"><u></u>=C2=A0<u></u></span></b></p>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"color:black">=C2=A0=C2=A0 BGP speakers that su=
pport the extended communities defined in this<u></u><u></u></span></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0 draft MUST also, by default, =
enforce the following check when<u></u><u></u></span></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0 receiving a flow-spec route f=
rom an EBGP peer: if the received flow-<u></u><u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"color:black">=C2=A0=C2=A0 spec route has a &#3=
9;redirect to IP&#39; extended community with a &#39;target<u></u><u></u></=
span></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0 address&#39; X (in the global=
 administrator field) and the best matching<u></u><u></u></span></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0 route to X is not a BGP route=
 with <b>origin AS</b> matching the peer AS<u></u><u></u></span></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0 then the extended community s=
hould be discarded and not propagated<u></u><u></u></span></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0 along with the flow-spec rout=
e to other peers. <u></u><u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"color:black"><u></u>=C2=A0<u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><b><span style=3D"color:black">I have 2 doubts related to thi=
s statement.</span></b><span style=3D"color:black"><u></u><u></u></span></p=
re>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"color:black"><u></u>=C2=A0<u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><b><span style=3D"color:black">What is &#39;origin AS&#39; he=
re? Is it the AS no. that is first added to the AS_PATH? </span></b><span s=
tyle=3D"color:black"><br><b>In the previous version of the draft its mentio=
ned as the last AS in the AS_PATH.</b><br><b>Is it the last AS no. that has=
 been added to the AS_PATH or the last AS no. from left in AS_PATH? </b><u>=
</u><u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"color:black"><u></u>=C2=A0<u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><b><span style=3D"color:black">What if the redirect target X =
is directly connected or reachable by a static route and its not advertised=
 by EBGP?</span></b><span style=3D"color:black"><u></u><u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><b><span style=3D"color:black">Do we need to consider that ac=
tion invalid in that case?</span></b><span style=3D"color:black"><u></u><u>=
</u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"color:black"><u></u>=C2=A0<u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"color:black"><u></u>=C2=A0<u></u></span></pre>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"font-family:&quot;Tahoma&quot;,sans-serif;colo=
r:black">Thanks,</span><span style=3D"color:black"><u></u><u></u></span></p=
re>
<pre style=3D"font-variant-ligatures:normal;font-variant-caps:normal;text-a=
lign:start;text-decoration-style:initial;text-decoration-color:initial;word=
-spacing:0px"><span style=3D"font-family:&quot;Tahoma&quot;,sans-serif;colo=
r:black">Pavana.</span><span style=3D"color:black"><u></u><u></u></span></p=
re>
<p class=3D"MsoNormal"><b><span style=3D"font-size:18.0pt;font-family:&quot=
;Courier New&quot;;color:black"><u></u>=C2=A0<u></u></span></b></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><b><span style=3D"font-size:13.5pt;font-family:&quot=
;Courier New&quot;;color:black"><u></u>=C2=A0<u></u></span></b></p>
</div>
</div>
</div></div></div>
</div>

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

--000000000000361956056ae14be7--


From nobody Sat Apr 28 15:23:50 2018
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Subject: [Idr] Secdir last call review of draft-ietf-idr-bgp-gr-notification-15
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Reviewer: Yoav Nir
Review result: Ready

I have reviewed this document as part of the security directorate's
ongoing effort to review all IETF documents being processed by the IESG.
These comments were written primarily for the benefit of the security
area directors.  Document editors and WG chairs should treat these
comments just like any other last call comments.

The document extends the BGP Graceful Restart feature from RFC 4724 to also
cover Notification messages. It does not make significant changes to the
security properties of the original RFC.

The one concern I had while reading the draft was in section 4.1 where when the
extension is active, stale routes are not deleted, so an attacker can use
repeated resets (the BGP connection is just TCP) to prevent stale route
deletion. As the security considerations section says, this is mitigating by
elevating the stale timer (after which stale routes are deleted) from MAY to
MUST in that case.

In summary, the document is well-written and deals with the security issues
adequately.


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From: "Simpson, Adam 1. (Nokia - CA/Ottawa)" <adam.1.simpson@nokia.com>
To: PVLR Pavana Murthy <pvlrpm@gmail.com>, "David Smith (djsmith)" <djsmith@cisco.com>
CC: idr wg <idr@ietf.org>, Pradosh Mohapatra <mpradosh@yahoo.com>, "draft-ietf-idr-bgp-flowspec-oid@ietf.org" <draft-ietf-idr-bgp-flowspec-oid@ietf.org>, "ju1738@att.com" <ju1738@att.com>, "jhaas@juniper.net" <jhaas@juniper.net>, "akarch@cisco.com" <akarch@cisco.com>, "sairay@cisco.com" <sairay@cisco.com>, "pmohapat@cumulusnetworks.com" <pmohapat@cumulusnetworks.com>, "wim.henderickx@alcatel-lucent.be" <wim.henderickx@alcatel-lucent.be>, "mtexier@arbor.net" <mtexier@arbor.net>
Thread-Topic: Validation for BGP Flow-Spec Redirect to IP Action
Thread-Index: AQHT3qvIvgs0k9FZ1kqdZpgXcrBfhqQX4/2A
Date: Sun, 29 Apr 2018 19:42:24 +0000
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Subject: Re: [Idr] Validation for BGP Flow-Spec Redirect to IP Action
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From: PVLR Pavana Murthy <pvlrpm@gmail.com>
Date: Mon, 30 Apr 2018 11:54:20 +0530
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To: "Simpson, Adam 1. (Nokia - CA/Ottawa)" <adam.1.simpson@nokia.com>
Cc: "David Smith (djsmith)" <djsmith@cisco.com>, idr wg <idr@ietf.org>,  Pradosh Mohapatra <mpradosh@yahoo.com>,  "draft-ietf-idr-bgp-flowspec-oid@ietf.org" <draft-ietf-idr-bgp-flowspec-oid@ietf.org>,  "ju1738@att.com" <ju1738@att.com>, "jhaas@juniper.net" <jhaas@juniper.net>,  "akarch@cisco.com" <akarch@cisco.com>, "sairay@cisco.com" <sairay@cisco.com>,  "pmohapat@cumulusnetworks.com" <pmohapat@cumulusnetworks.com>,  "wim.henderickx@alcatel-lucent.be" <wim.henderickx@alcatel-lucent.be>, "mtexier@arbor.net" <mtexier@arbor.net>
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Subject: Re: [Idr] Validation for BGP Flow-Spec Redirect to IP Action
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Hi Adam,
  Thanks for the reply. If its the first AS that is added to the AS_PATH,
then "the redirect IP" action received from the AS's that are not directly
connected may be invalid always.

eg:
    A---B----C

A, B and C are 3 routers in different AS's  1, 2 and 3 respectively.
A advertises a route for target X and also a Flowspec route with "redirect
IP(target X)". C receives these routes via B.
Now the the origin AS or first AS in the AS_PATH of the route to target X
is 1 but the peer-AS is 2 since the route is received from B.
Since the peer-AS does not match the first AS of the best route target X,
this redirect IP action is considered invalid.


Please let me know if that's expected.

--Pavana.

On Mon, Apr 30, 2018 at 1:12 AM, Simpson, Adam 1. (Nokia - CA/Ottawa) <
adam.1.simpson@nokia.com> wrote:

> Hi Pavana,
>
>
>
> The purpose of this text in the draft was to close the door on the abilit=
y
> for an accidental/malicious originator of a flow-spec route in AS=3Dx fro=
m
> redirecting flows towards a target IP address in some other AS=3Dy.
>
>
>
> So, in this context we are interested in looking at the first AS in
> AS_PATH of the flow-spec route, not the most recently added AS in the
> AS_PATH (which would be the =E2=80=98neighbor AS=E2=80=99).
>
>
>
> The route that resolves the target redirect IP address could be a BGP
> route or it could be a non-BGP route, despite the wording in the draft. I=
f
> it is a BGP route the origin AS is determined as described above. If is a
> non-BGP route it would probably be appropriate to consider the route as
> locally originated (i.e. the same as a BGP route with null/empty AS_PATH =
or
> having only confed related elements).
>
>
>
> I hope this helps.
>
>
>
> -Adam
>
>
>
>
>
> *From: *PVLR Pavana Murthy <pvlrpm@gmail.com>
> *Date: *Saturday, April 28, 2018 at 12:45 AM
> *To: *"David Smith (djsmith)" <djsmith@cisco.com>
> *Cc: *idr wg <idr@ietf.org>, Pradosh Mohapatra <mpradosh@yahoo.com>, "
> draft-ietf-idr-bgp-flowspec-oid@ietf.org" <draft-ietf-idr-bgp-flowspec-
> oid@ietf.org>, "ju1738@att.com" <ju1738@att.com>, "jhaas@juniper.net" <
> jhaas@juniper.net>, "akarch@cisco.com" <akarch@cisco.com>, "
> sairay@cisco.com" <sairay@cisco.com>, "pmohapat@cumulusnetworks.com" <
> pmohapat@cumulusnetworks.com>, "wim.henderickx@alcatel-lucent.be" <
> wim.henderickx@alcatel-lucent.be>, "Simpson, Adam 1. (Nokia - CA/Ottawa)"
> <adam.1.simpson@nokia.com>, "mtexier@arbor.net" <mtexier@arbor.net>
> *Subject: *Re: Validation for BGP Flow-Spec Redirect to IP Action
>
>
>
> Hello,
>
>   Including all the authors mentioned in draft-ietf-idr-flowspec-redirect=
-ip-02,
> as the alias did not work. Also pasting doubts again here.
>
>
>
> In the draft  draft-ietf-idr-flowspec-redirect-ip-02.txt, the following
> procedure is mentioned to validate the extended community of 'Flowspec
>
> redirect to IP'.
>
>
>
>    BGP speakers that support the extended communities defined in this
>
>    draft MUST also, by default, enforce the following check when
>
>    receiving a flow-spec route from an EBGP peer: if the received flow-
>
>    spec route has a 'redirect to IP' extended community with a 'target
>
>    address' X (in the global administrator field) and the best matching
>
>    route to X is not a BGP route with *origin AS* matching the peer AS
>
>    then the extended community should be discarded and not propagated
>
>    along with the flow-spec route to other peers.
>
>
>
> *I have 2 doubts related to this statement.*
>
>
>
> *What is 'origin AS' here? Is it the AS no. that is first added to the AS=
_PATH? *
> *In the previous version of the draft its mentioned as the last AS in the=
 AS_PATH.*
> *Is it the last AS no. that has been added to the AS_PATH or the last AS =
no. from left in AS_PATH? *
>
>
>
> *What if the redirect target X is directly connected or reachable by a st=
atic route and its not advertised by EBGP?*
>
> *Do we need to consider that action invalid in that case?*
>
>
>
> Thanks,
>
> Pavana.
>
>
>
>
>
> On Sat, Apr 28, 2018 at 10:10 AM, PVLR Pavana Murthy <pvlrpm@gmail.com>
> wrote:
>
> Hi Dave,
>
>    Thanks for the reply and including respective draft author aliases.
>
>
>
> I went through the latest draft-ietf-idr-bgp-flowspec-oid-06. It calls
> the first AS the Origin AS. Is it so?
>
> If that's the case, the validation will fail for any 'redirect IP' action=
s
> coming from the AS other than neighbor AS. Is that the intention?
>
> Also In  draft-ietf-idr-flowspec-redirect-ip-00.txt, instead of 'origin
> AS', the word 'last AS' is used.It is confusing.   Does the validation ne=
ed
> to consider the first AS or last AS?
>
>
>
> Regarding my second doubt, I could not get any pointers from
> draft-ietf-idr-bgp-flowspec-oid-06 .  Do we need to consider only BGP
> routes always?
>
>
>
> Thanks,
>
> Pavana.
>
>
>
>
> On Sat, Apr 28, 2018 at 3:37 AM, David Smith (djsmith) <djsmith@cisco.com=
>
> wrote:
>
> Hi Pavana,
>
>
>
> Your points are valid. With that said, I=E2=80=99ll defer you to
> draft-ietf-idr-bgp-flowspec-oid-05 (and later) and, specifically, section
> 4 (revised validation procedure) which addresses your points below.
>
>
>
> Co-incidentally, a WG last call was issued for draft-ietf-idr-bgp-flowspe=
c-oid-06
> yesterday.
>
>
>
> Regards,
>
>
>
> /dave
>
>
>
>
>
> *From:* PVLR Pavana Murthy <pvlrpm@gmail.com>
> *Sent:* Friday, April 13, 2018 1:51 AM
> *To:* idr wg <idr@ietf.org>; pmohapat@cumulusnetworks.com; David Smith
> (djsmith) <djsmith@cisco.com>
> *Subject:* Validation for BGP Flow-Spec Redirect to IP Action
>
>
>
> Hello,
>
>   In the draft  draft-ietf-idr-flowspec-redirect-ip-02.txt, the following
> procedure is mentioned to validate the extended community of 'Flowspec
>
> redirect to IP'.
>
>
>
>
>
>    BGP speakers that support the extended communities defined in this
>
>    draft MUST also, by default, enforce the following check when
>
>    receiving a flow-spec route from an EBGP peer: if the received flow-
>
>    spec route has a 'redirect to IP' extended community with a 'target
>
>    address' X (in the global administrator field) and the best matching
>
>    route to X is not a BGP route with *origin AS* matching the peer AS
>
>    then the extended community should be discarded and not propagated
>
>    along with the flow-spec route to other peers.
>
>
>
> *I have 2 doubts related to this statement.*
>
>
>
> *What is 'origin AS' here? Is it the AS no. that is first added to the AS=
_PATH? *
> *In the previous version of the draft its mentioned as the last AS in the=
 AS_PATH.*
> *Is it the last AS no. that has been added to the AS_PATH or the last AS =
no. from left in AS_PATH? *
>
>
>
> *What if the redirect target X is directly connected or reachable by a st=
atic route and its not advertised by EBGP?*
>
> *Do we need to consider that action invalid in that case?*
>
>
>
>
>
> Thanks,
>
> Pavana.
>
>
>
>
>
>
>
>
>
>
>

--0000000000007e73ae056b0ae7a9
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Adam,<div>=C2=A0 Thanks for the reply. If its the first=
 AS that is added to the AS_PATH, then &quot;the redirect IP&quot; action r=
eceived from the AS&#39;s that are not directly connected may be invalid al=
ways.</div><div><br></div><div>eg:</div><div>=C2=A0 =C2=A0 A---B----C</div>=
<div><br></div><div>A, B and C are 3 routers in different AS&#39;s=C2=A0 1,=
 2 and 3 respectively.=C2=A0</div><div>A advertises a route for target X an=
d also a Flowspec route with &quot;redirect=C2=A0 IP(target X)&quot;. C rec=
eives these routes via B.</div><div>Now the the origin AS or first AS in th=
e AS_PATH of the route to target X is 1 but the peer-AS is 2 since the rout=
e is received from B.=C2=A0</div><div>Since the peer-AS does not match the =
first AS of the best route target X,=C2=A0 this redirect IP action is consi=
dered invalid.</div><div><br></div><div><br></div><div>Please let me know i=
f that&#39;s expected.</div><div><br></div><div>--Pavana.</div></div><div c=
lass=3D"gmail_extra"><br><div class=3D"gmail_quote">On Mon, Apr 30, 2018 at=
 1:12 AM, Simpson, Adam 1. (Nokia - CA/Ottawa) <span dir=3D"ltr">&lt;<a hre=
f=3D"mailto:adam.1.simpson@nokia.com" target=3D"_blank">adam.1.simpson@noki=
a.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"m=
argin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-CA" link=3D"blue" vlink=3D"purple">
<div class=3D"m_5701887331653252831WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif">Hi Pavana,<u></u><u></=
u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif">The purpose of this te=
xt in the draft was to close the door on the ability for an accidental/mali=
cious originator of a flow-spec route in AS=3Dx from
 redirecting flows towards a target IP address in some other AS=3Dy. <u></u=
><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif">So, in this context we=
 are interested in looking at the first AS in AS_PATH of the flow-spec rout=
e, not the most recently added AS in the AS_PATH
 (which would be the =E2=80=98neighbor AS=E2=80=99).<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif">The route that resolve=
s the target redirect IP address could be a BGP route or it could be a non-=
BGP route, despite the wording in the draft. If
 it is a BGP route the origin AS is determined as described above. If is a =
non-BGP route it would probably be appropriate to consider the route as loc=
ally originated (i.e. the same as a BGP route with null/empty AS_PATH or ha=
ving only confed related elements).<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif">I hope this helps.<u><=
/u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif">-Adam<u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif"><u></u>=C2=A0<u></u></=
span></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span style=3D"font-=
size:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">PVLR Pavana Murthy =
&lt;<a href=3D"mailto:pvlrpm@gmail.com" target=3D"_blank">pvlrpm@gmail.com<=
/a>&gt;<br>
<b>Date: </b>Saturday, April 28, 2018 at 12:45 AM<span class=3D""><br>
<b>To: </b>&quot;David Smith (djsmith)&quot; &lt;<a href=3D"mailto:djsmith@=
cisco.com" target=3D"_blank">djsmith@cisco.com</a>&gt;<br>
</span><b>Cc: </b>idr wg &lt;<a href=3D"mailto:idr@ietf.org" target=3D"_bla=
nk">idr@ietf.org</a>&gt;, Pradosh Mohapatra &lt;<a href=3D"mailto:mpradosh@=
yahoo.com" target=3D"_blank">mpradosh@yahoo.com</a>&gt;, &quot;<a href=3D"m=
ailto:draft-ietf-idr-bgp-flowspec-oid@ietf.org" target=3D"_blank">draft-iet=
f-idr-bgp-flowspec-<wbr>oid@ietf.org</a>&quot; &lt;<a href=3D"mailto:draft-=
ietf-idr-bgp-flowspec-oid@ietf.org" target=3D"_blank">draft-ietf-idr-bgp-fl=
owspec-<wbr>oid@ietf.org</a>&gt;, &quot;<a href=3D"mailto:ju1738@att.com" t=
arget=3D"_blank">ju1738@att.com</a>&quot; &lt;<a href=3D"mailto:ju1738@att.=
com" target=3D"_blank">ju1738@att.com</a>&gt;, &quot;<a href=3D"mailto:jhaa=
s@juniper.net" target=3D"_blank">jhaas@juniper.net</a>&quot; &lt;<a href=3D=
"mailto:jhaas@juniper.net" target=3D"_blank">jhaas@juniper.net</a>&gt;, &qu=
ot;<a href=3D"mailto:akarch@cisco.com" target=3D"_blank">akarch@cisco.com</=
a>&quot; &lt;<a href=3D"mailto:akarch@cisco.com" target=3D"_blank">akarch@c=
isco.com</a>&gt;,
 &quot;<a href=3D"mailto:sairay@cisco.com" target=3D"_blank">sairay@cisco.c=
om</a>&quot; &lt;<a href=3D"mailto:sairay@cisco.com" target=3D"_blank">sair=
ay@cisco.com</a>&gt;, &quot;<a href=3D"mailto:pmohapat@cumulusnetworks.com"=
 target=3D"_blank">pmohapat@cumulusnetworks.com</a>&quot; &lt;<a href=3D"ma=
ilto:pmohapat@cumulusnetworks.com" target=3D"_blank">pmohapat@cumulusnetwor=
ks.com</a>&gt;<wbr>, &quot;<a href=3D"mailto:wim.henderickx@alcatel-lucent.=
be" target=3D"_blank">wim.henderickx@alcatel-<wbr>lucent.be</a>&quot; &lt;<=
a href=3D"mailto:wim.henderickx@alcatel-lucent.be" target=3D"_blank">wim.he=
nderickx@alcatel-<wbr>lucent.be</a>&gt;, &quot;Simpson, Adam 1. (Nokia - CA=
/Ottawa)&quot; &lt;<a href=3D"mailto:adam.1.simpson@nokia.com" target=3D"_b=
lank">adam.1.simpson@nokia.com</a>&gt;, &quot;<a href=3D"mailto:mtexier@arb=
or.net" target=3D"_blank">mtexier@arbor.net</a>&quot;
 &lt;<a href=3D"mailto:mtexier@arbor.net" target=3D"_blank">mtexier@arbor.n=
et</a>&gt;<br>
<b>Subject: </b>Re: Validation for BGP Flow-Spec Redirect to IP Action<u></=
u><u></u></span></p>
</div><div><div class=3D"h5">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><a name=3D"m_5701887331=
653252831__MailOriginalBody">Hello,
<u></u><u></u></a></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>=C2=A0 Including =
all the authors mentioned in=C2=A0draft-ietf-idr-flowspec-<wbr>redirect-ip-=
02, as the alias did not work. Also pasting doubts again here.<u></u><u></u=
></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><span style=3D"fo=
nt-family:&quot;tahoma&quot;,sans-serif">In the draft=C2=A0</span></span><s=
pan><span style=3D"font-size:18.0pt;font-family:&quot;tahoma&quot;,sans-ser=
if">=C2=A0</span></span><span><span style=3D"font-family:&quot;tahoma&quot;=
,sans-serif;color:black">draft-ietf-idr-<wbr>flowspec-redirect-ip-02.txt,
 the following procedure is mentioned to validate the extended community of=
 &#39;Flowspec
</span></span><span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><span style=3D"fo=
nt-family:&quot;tahoma&quot;,sans-serif;color:black">redirect to IP&#39;.</=
span></span><span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<pre style=3D"margin-left:36.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><span style=3D"color:black">=C2=A0=C2=A0 BGP speakers that support the ex=
tended communities defined in this<u></u><u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;background:white"><span><span style=3D"col=
or:black">=C2=A0=C2=A0 draft MUST also, by default, enforce the following c=
heck when<u></u><u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;background:white"><span><span style=3D"col=
or:black">=C2=A0=C2=A0 receiving a flow-spec route from an EBGP peer: if th=
e received flow-<u></u><u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><span style=3D"color:black">=C2=A0=C2=A0 spec route has a &#39;redirect t=
o IP&#39; extended community with a &#39;target<u></u><u></u></span></span>=
</pre>
<pre style=3D"margin-left:36.0pt;background:white"><span><span style=3D"col=
or:black">=C2=A0=C2=A0 address&#39; X (in the global administrator field) a=
nd the best matching<u></u><u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;background:white"><span><span style=3D"col=
or:black">=C2=A0=C2=A0 route to X is not a BGP route with <b>origin AS</b> =
matching the peer AS<u></u><u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;background:white"><span><span style=3D"col=
or:black">=C2=A0=C2=A0 then the extended community should be discarded and =
not propagated<u></u><u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;background:white"><span><span style=3D"col=
or:black">=C2=A0=C2=A0 along with the flow-spec route to other peers. <u></=
u><u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><span style=3D"color:black"><u></u>=C2=A0<u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><b><span style=3D"color:black">I have 2 doubts related to this statement.=
</span></b><span style=3D"color:black"><u></u><u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><span style=3D"color:black"><u></u>=C2=A0<u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><b><span style=3D"color:black">What is &#39;origin AS&#39; here? Is it th=
e AS no. that is first added to the AS_PATH? </span></b><span style=3D"colo=
r:black"><br><b>In the previous version of the draft its mentioned as the l=
ast AS in the AS_PATH.</b><br><b>Is it the last AS no. that has been added =
to the AS_PATH or the last AS no. from left in AS_PATH? </b><u></u><u></u><=
/span></span></pre>
<pre style=3D"margin-left:36.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><span style=3D"color:black"><u></u>=C2=A0<u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><b><span style=3D"color:black">What if the redirect target X is directly =
connected or reachable by a static route and its not advertised by EBGP?</s=
pan></b><span style=3D"color:black"><u></u><u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><b><span style=3D"color:black">Do we need to consider that action invalid=
 in that case?</span></b><span style=3D"color:black"><u></u><u></u></span><=
/span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><span style=3D"fo=
nt-size:18.0pt;color:black"><br>
<br>
</span></span><span><u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>Thanks,<u></u><u>=
</u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>Pavana.<u></u><u>=
</u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>On Sat, Apr 28, 2=
018 at 10:10 AM, PVLR Pavana Murthy &lt;</span><a href=3D"mailto:pvlrpm@gma=
il.com" target=3D"_blank"><span>pvlrpm@gmail.com</span><span></span></a><sp=
an>&gt;
 wrote:<u></u><u></u></span></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>Hi Dave,
<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>=C2=A0 =C2=A0Than=
ks for the reply and including respective draft author aliases.=C2=A0=C2=A0=
<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>I went through th=
e latest
<span style=3D"color:#222222;background:white">draft-ietf-idr-bgp-flowspec-=
<wbr>oid-06. It calls the first AS the Origin AS. Is it so?=C2=A0</span><u>=
</u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><span style=3D"co=
lor:#222222;background:white">If that&#39;s the case, the validation will f=
ail for any &#39;redirect IP&#39; actions coming from the AS other than nei=
ghbor AS. Is
 that the intention?</span></span><span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><span style=3D"co=
lor:#222222;background:white">Also In=C2=A0=C2=A0draft-ietf-idr-flowspec-<w=
br>redirect-ip-00.txt, instead of &#39;origin AS&#39;, the word &#39;last A=
S&#39; is used.It is confusing.=C2=A0
 =C2=A0Does the validation need to consider the first AS or last AS?=C2=A0<=
/span></span><span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><span style=3D"co=
lor:#222222;background:white"><br>
<br>
</span></span><span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><span style=3D"co=
lor:#222222;background:white">Regarding my second doubt, I could not get an=
y pointers from=C2=A0 draft-ietf-idr-bgp-flowspec-<wbr>oid-06=C2=A0.=C2=A0 =
Do we need to consider
 only BGP routes always?</span></span><span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><span style=3D"co=
lor:#222222;background:white"><br>
<br>
</span></span><span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><span style=3D"co=
lor:#222222;background:white">Thanks,</span></span><span><u></u><u></u></sp=
an></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><span style=3D"co=
lor:#222222;background:white">Pavana.<br>
=C2=A0</span></span><span><u></u><u></u></span></p>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>On Sat, Apr 28, 2=
018 at 3:37 AM, David Smith (djsmith) &lt;</span><a href=3D"mailto:djsmith@=
cisco.com" target=3D"_blank"><span>djsmith@cisco.com</span><span></span></a=
><span>&gt;
 wrote:<u></u><u></u></span></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US">Hi Pavana,<u></u><u></u></span></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US">Your points are valid. With that said, I=E2=80=
=99ll defer you to draft-ietf-idr-bgp-flowspec-<wbr>oid-05 (and later) and,=
 specifically, section 4 (revised validation procedure) which addresses you=
r points below.<u></u><u></u></span></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US">Co-incidentally, a WG last call was issued for d=
raft-ietf-idr-bgp-flowspec-<wbr>oid-06 yesterday.
<u></u><u></u></span></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US">Regards,<u></u><u></u></span></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US">/dave<u></u><u></u></span></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"color:#1f497d">=C2=A0</span></span><spa=
n><span lang=3D"EN-US"><u></u><u></u></span></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><b><span lang=3D"EN-US">From:</span></b></span><span><span lang=3D"EN=
-US"> PVLR Pavana Murthy &lt;</span></span><a href=3D"mailto:pvlrpm@gmail.c=
om" target=3D"_blank"><span><span lang=3D"EN-US">pvlrpm@gmail.com</span></s=
pan><span></span></a><span><span lang=3D"EN-US">&gt;
<br>
<b>Sent:</b> Friday, April 13, 2018 1:51 AM<br>
<b>To:</b> idr wg &lt;</span></span><a href=3D"mailto:idr@ietf.org" target=
=3D"_blank"><span><span lang=3D"EN-US">idr@ietf.org</span></span><span></sp=
an></a><span><span lang=3D"EN-US">&gt;;
</span></span><a href=3D"mailto:pmohapat@cumulusnetworks.com" target=3D"_bl=
ank"><span><span lang=3D"EN-US">pmohapat@cumulusnetworks.com</span></span><=
span></span></a><span><span lang=3D"EN-US">;
 David Smith (djsmith) &lt;</span></span><a href=3D"mailto:djsmith@cisco.co=
m" target=3D"_blank"><span><span lang=3D"EN-US">djsmith@cisco.com</span></s=
pan><span></span></a><span><span lang=3D"EN-US">&gt;<br>
<b>Subject:</b> Validation for BGP Flow-Spec Redirect to IP Action<u></u><u=
></u></span></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"font-family:&quot;tahoma&quot;,sans-ser=
if">Hello,</span></span><span><span lang=3D"EN-US"><u></u><u></u></span></s=
pan></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"font-family:&quot;tahoma&quot;,sans-ser=
if">=C2=A0 In the draft=C2=A0</span></span><span><span lang=3D"EN-US" style=
=3D"font-size:18.0pt;font-family:&quot;tahoma&quot;,sans-serif">=C2=A0</spa=
n></span><span><span lang=3D"EN-US" style=3D"font-family:&quot;tahoma&quot;=
,sans-serif;color:black">draft-ietf-idr-<wbr>flowspec-redirect-ip-02.txt,
 the following procedure is mentioned to validate the extended community of=
 &#39;Flowspec
</span></span><span><span lang=3D"EN-US"><u></u><u></u></span></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"font-family:&quot;tahoma&quot;,sans-ser=
if;color:black">redirect to IP&#39;.</span></span><span><span lang=3D"EN-US=
"><u></u><u></u></span></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><b><span lang=3D"EN-US" style=3D"font-size:18.0pt;font-family:&quot;C=
ourier New&quot;;color:black">=C2=A0</span></b></span><span><span lang=3D"E=
N-US"><u></u><u></u></span></span></p>
<pre style=3D"margin-left:36.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"color:=
black">=C2=A0=C2=A0 BGP speakers that support the extended communities defi=
ned in this</span></span><span><span lang=3D"EN-US"><u></u><u></u></span></=
span></pre>
<pre style=3D"margin-left:36.0pt"><span><span lang=3D"EN-US" style=3D"color=
:black">=C2=A0=C2=A0 draft MUST also, by default, enforce the following che=
ck when</span></span><span><span lang=3D"EN-US"><u></u><u></u></span></span=
></pre>
<pre style=3D"margin-left:36.0pt"><span><span lang=3D"EN-US" style=3D"color=
:black">=C2=A0=C2=A0 receiving a flow-spec route from an EBGP peer: if the =
received flow-</span></span><span><span lang=3D"EN-US"><u></u><u></u></span=
></span></pre>
<pre style=3D"margin-left:36.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"color:=
black">=C2=A0=C2=A0 spec route has a &#39;redirect to IP&#39; extended comm=
unity with a &#39;target</span></span><span><span lang=3D"EN-US"><u></u><u>=
</u></span></span></pre>
<pre style=3D"margin-left:36.0pt"><span><span lang=3D"EN-US" style=3D"color=
:black">=C2=A0=C2=A0 address&#39; X (in the global administrator field) and=
 the best matching</span></span><span><span lang=3D"EN-US"><u></u><u></u></=
span></span></pre>
<pre style=3D"margin-left:36.0pt"><span><span lang=3D"EN-US" style=3D"color=
:black">=C2=A0=C2=A0 route to X is not a BGP route with <b>origin AS</b> ma=
tching the peer AS</span></span><span><span lang=3D"EN-US"><u></u><u></u></=
span></span></pre>
<pre style=3D"margin-left:36.0pt"><span><span lang=3D"EN-US" style=3D"color=
:black">=C2=A0=C2=A0 then the extended community should be discarded and no=
t propagated</span></span><span><span lang=3D"EN-US"><u></u><u></u></span><=
/span></pre>
<pre style=3D"margin-left:36.0pt"><span><span lang=3D"EN-US" style=3D"color=
:black">=C2=A0=C2=A0 along with the flow-spec route to other peers. </span>=
</span><span><span lang=3D"EN-US"><u></u><u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"color:=
black">=C2=A0</span></span><span><span lang=3D"EN-US"><u></u><u></u></span>=
</span></pre>
<pre style=3D"margin-left:36.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><b><span lang=3D"EN-US" style=3D"col=
or:black">I have 2 doubts related to this statement.</span></b></span><span=
><span lang=3D"EN-US"><u></u><u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"color:=
black">=C2=A0</span></span><span><span lang=3D"EN-US"><u></u><u></u></span>=
</span></pre>
<pre style=3D"margin-left:36.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><b><span lang=3D"EN-US" style=3D"col=
or:black">What is &#39;origin AS&#39; here? Is it the AS no. that is first =
added to the AS_PATH? </span></b></span><span><span lang=3D"EN-US" style=3D=
"color:black"><br><b>In the previous version of the draft its mentioned as =
the last AS in the AS_PATH.</b><br><b>Is it the last AS no. that has been a=
dded to the AS_PATH or the last AS no. from left in AS_PATH? </b></span></s=
pan><span><span lang=3D"EN-US"><u></u><u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"color:=
black">=C2=A0</span></span><span><span lang=3D"EN-US"><u></u><u></u></span>=
</span></pre>
<pre style=3D"margin-left:36.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><b><span lang=3D"EN-US" style=3D"col=
or:black">What if the redirect target X is directly connected or reachable =
by a static route and its not advertised by EBGP?</span></b></span><span><s=
pan lang=3D"EN-US"><u></u><u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><b><span lang=3D"EN-US" style=3D"col=
or:black">Do we need to consider that action invalid in that case?</span></=
b></span><span><span lang=3D"EN-US"><u></u><u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"color:=
black">=C2=A0</span></span><span><span lang=3D"EN-US"><u></u><u></u></span>=
</span></pre>
<pre style=3D"margin-left:36.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"color:=
black">=C2=A0</span></span><span><span lang=3D"EN-US"><u></u><u></u></span>=
</span></pre>
<pre style=3D"margin-left:36.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"font-f=
amily:&quot;tahoma&quot;,sans-serif;color:black">Thanks,</span></span><span=
><span lang=3D"EN-US"><u></u><u></u></span></span></pre>
<pre style=3D"margin-left:36.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"font-f=
amily:&quot;tahoma&quot;,sans-serif;color:black">Pavana.</span></span><span=
><span lang=3D"EN-US"><u></u><u></u></span></span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><b><span lang=3D"EN-US" style=3D"font-size:18.0pt;font-family:&quot;C=
ourier New&quot;;color:black">=C2=A0</span></b></span><span><span lang=3D"E=
N-US"><u></u><u></u></span></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US">=C2=A0<u></u><u></u></span></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><b><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-family:&quot;C=
ourier New&quot;;color:black">=C2=A0</span></b></span><span><span lang=3D"E=
N-US"><u></u><u></u></span></span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
</div></div></div>
</div>

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

--0000000000007e73ae056b0ae7a9--


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From: "Simpson, Adam 1. (Nokia - CA/Ottawa)" <adam.1.simpson@nokia.com>
To: PVLR Pavana Murthy <pvlrpm@gmail.com>
CC: idr wg <idr@ietf.org>
Thread-Topic: Validation for BGP Flow-Spec Redirect to IP Action
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Subject: Re: [Idr] Validation for BGP Flow-Spec Redirect to IP Action
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Date: Mon, 30 Apr 2018 16:34:41 +0000
From: Job Snijders <job@ntt.net>
To: Susan Hares <shares@ndzh.com>
Cc: idr@ietf.org, draft-snijders-idr-rfc8203bis@ietf.org, "'John G. Scudder'" <jgs@bgp.nu>
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Subject: Re: [Idr] IDR WG adoption call for draft-snijders-idr-rfc8203bis (ends April 4, 2018) - Document adopted
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On Wed, Apr 18, 2018 at 07:01:57PM -0400, Susan Hares wrote:
> The WG adoption call for draft-snijders-idr-rfc8203bis has been adopted.
> The authors should submit this draft as draft-idr-rfc8203bis-00.txt. 

I have done so just now. Our next step will be to ensure the mechanism
can work appropriately in cojunction with GR Notification.

Kind regards,

Job


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From: PVLR Pavana Murthy <pvlrpm@gmail.com>
Date: Mon, 30 Apr 2018 22:44:08 +0530
Message-ID: <CAN-MQG7g9UX0OSY=WeLUfErpmdRYKnwxAySu1h4-sjwDdviHcg@mail.gmail.com>
To: "Simpson, Adam 1. (Nokia - CA/Ottawa)" <adam.1.simpson@nokia.com>
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Subject: Re: [Idr] Validation for BGP Flow-Spec Redirect to IP Action
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--00000000000063fc7d056b13fbc1
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Hi Adam,
   In draft-ietf-idr-bgp-flowspec-oid-06(Revised Validation Procedure for
BGP Flow Specifications), the following is mentioned.  Probably this could
be the reason to use the  peer-as.

"Note, comparing only the last ASes is
sufficient for EBGP learned flow specification NLRIs. Requiring a
full AS_PATH match would limit origination of inter-domain flow
specifications to the origin (or first) AS of the best-match unicast
route for the destination prefix embedded in the flow specification
only. As such, a full AS_PATH validity check may prevent transit
ASes from originating inter-domain flow specifications which is not
desirable."


Also in draft-ietf-idr-flowspec-redirect-ip-00.txt, the term 'las AS' is
used instead of 'Origin As'. Even the CISCO document (
https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r5-2/r=
outing/configuration/guide/b_routing_cg52xasr9k/b_routing_cg52xasr9k_chapte=
r_011.html
)  uses the term 'last AS'.


Anyways, thanks for explaining the philosophy behind the validation.

-Pavana.


On Mon, Apr 30, 2018 at 9:00 PM, Simpson, Adam 1. (Nokia - CA/Ottawa) <
adam.1.simpson@nokia.com> wrote:

> Hi Pavana,
>
>
>
> Peer-AS is not a consideration in draft -02. I don=E2=80=99t recall why i=
t was
> mentioned in an earlier version of the draft.
>
>
>
> If the routers inside B and C enable the extra validation check (it is
> optional as explained in the draft) then they would only install a flowsp=
ec
> route originated by a router inside A ,with a redirect-to-IP action, if t=
he
> redirect IP address itself was observed to originate inside A as well.
>
>
>
> So flow-spec routes originated by one AS can be valid in another AS, but
> only under restrictive circumstances.
>
>
>
> -Adam
>
>
>
> *From: *PVLR Pavana Murthy <pvlrpm@gmail.com>
> *Date: *Monday, April 30, 2018 at 2:24 AM
> *To: *"Simpson, Adam 1. (Nokia - CA/Ottawa)" <adam.1.simpson@nokia.com>
> *Cc: *"David Smith (djsmith)" <djsmith@cisco.com>, idr wg <idr@ietf.org>,
> Pradosh Mohapatra <mpradosh@yahoo.com>, "draft-ietf-idr-bgp-flowspec-
> oid@ietf.org" <draft-ietf-idr-bgp-flowspec-oid@ietf.org>, "ju1738@att.com=
"
> <ju1738@att.com>, "jhaas@juniper.net" <jhaas@juniper.net>, "
> akarch@cisco.com" <akarch@cisco.com>, "sairay@cisco.com" <sairay@cisco.co=
m>,
> "pmohapat@cumulusnetworks.com" <pmohapat@cumulusnetworks.com>, "
> wim.henderickx@alcatel-lucent.be" <wim.henderickx@alcatel-lucent.be>, "
> mtexier@arbor.net" <mtexier@arbor.net>
>
> *Subject: *Re: Validation for BGP Flow-Spec Redirect to IP Action
>
>
>
> Hi Adam,
>
>   Thanks for the reply. If its the first AS that is added to the AS_PATH,
> then "the redirect IP" action received from the AS's that are not directl=
y
> connected may be invalid always.
>
>
>
> eg:
>
>     A---B----C
>
>
>
> A, B and C are 3 routers in different AS's  1, 2 and 3 respectively.
>
> A advertises a route for target X and also a Flowspec route with
> "redirect  IP(target X)". C receives these routes via B.
>
> Now the the origin AS or first AS in the AS_PATH of the route to target X
> is 1 but the peer-AS is 2 since the route is received from B.
>
> Since the peer-AS does not match the first AS of the best route target X,
> this redirect IP action is considered invalid.
>
>
>
>
>
> Please let me know if that's expected.
>
>
>
> --Pavana.
>
>
>
> On Mon, Apr 30, 2018 at 1:12 AM, Simpson, Adam 1. (Nokia - CA/Ottawa) <
> adam.1.simpson@nokia.com> wrote:
>
> Hi Pavana,
>
>
>
> The purpose of this text in the draft was to close the door on the abilit=
y
> for an accidental/malicious originator of a flow-spec route in AS=3Dx fro=
m
> redirecting flows towards a target IP address in some other AS=3Dy.
>
>
>
> So, in this context we are interested in looking at the first AS in
> AS_PATH of the flow-spec route, not the most recently added AS in the
> AS_PATH (which would be the =E2=80=98neighbor AS=E2=80=99).
>
>
>
> The route that resolves the target redirect IP address could be a BGP
> route or it could be a non-BGP route, despite the wording in the draft. I=
f
> it is a BGP route the origin AS is determined as described above. If is a
> non-BGP route it would probably be appropriate to consider the route as
> locally originated (i.e. the same as a BGP route with null/empty AS_PATH =
or
> having only confed related elements).
>
>
>
> I hope this helps.
>
>
>
> -Adam
>
>
>
>
>
> *From: *PVLR Pavana Murthy <pvlrpm@gmail.com>
> *Date: *Saturday, April 28, 2018 at 12:45 AM
> *To: *"David Smith (djsmith)" <djsmith@cisco.com>
> *Cc: *idr wg <idr@ietf.org>, Pradosh Mohapatra <mpradosh@yahoo.com>, "
> draft-ietf-idr-bgp-flowspec-oid@ietf.org" <draft-ietf-idr-bgp-flowspec-
> oid@ietf.org>, "ju1738@att.com" <ju1738@att.com>, "jhaas@juniper.net" <
> jhaas@juniper.net>, "akarch@cisco.com" <akarch@cisco.com>, "
> sairay@cisco.com" <sairay@cisco.com>, "pmohapat@cumulusnetworks.com" <
> pmohapat@cumulusnetworks.com>, "wim.henderickx@alcatel-lucent.be" <
> wim.henderickx@alcatel-lucent.be>, "Simpson, Adam 1. (Nokia - CA/Ottawa)"
> <adam.1.simpson@nokia.com>, "mtexier@arbor.net" <mtexier@arbor.net>
> *Subject: *Re: Validation for BGP Flow-Spec Redirect to IP Action
>
>
>
> Hello,
>
>   Including all the authors mentioned in draft-ietf-idr-flowspec-redirect=
-ip-02,
> as the alias did not work. Also pasting doubts again here.
>
>
>
> In the draft  draft-ietf-idr-flowspec-redirect-ip-02.txt, the following
> procedure is mentioned to validate the extended community of 'Flowspec
>
> redirect to IP'.
>
>
>
>    BGP speakers that support the extended communities defined in this
>
>    draft MUST also, by default, enforce the following check when
>
>    receiving a flow-spec route from an EBGP peer: if the received flow-
>
>    spec route has a 'redirect to IP' extended community with a 'target
>
>    address' X (in the global administrator field) and the best matching
>
>    route to X is not a BGP route with *origin AS* matching the peer AS
>
>    then the extended community should be discarded and not propagated
>
>    along with the flow-spec route to other peers.
>
>
>
> *I have 2 doubts related to this statement.*
>
>
>
> *What is 'origin AS' here? Is it the AS no. that is first added to the AS=
_PATH? *
> *In the previous version of the draft its mentioned as the last AS in the=
 AS_PATH.*
> *Is it the last AS no. that has been added to the AS_PATH or the last AS =
no. from left in AS_PATH? *
>
>
>
> *What if the redirect target X is directly connected or reachable by a st=
atic route and its not advertised by EBGP?*
>
> *Do we need to consider that action invalid in that case?*
>
>
>
> Thanks,
>
> Pavana.
>
>
>
>
>
> On Sat, Apr 28, 2018 at 10:10 AM, PVLR Pavana Murthy <pvlrpm@gmail.com>
> wrote:
>
> Hi Dave,
>
>    Thanks for the reply and including respective draft author aliases.
>
>
>
> I went through the latest draft-ietf-idr-bgp-flowspec-oid-06. It calls
> the first AS the Origin AS. Is it so?
>
> If that's the case, the validation will fail for any 'redirect IP' action=
s
> coming from the AS other than neighbor AS. Is that the intention?
>
> Also In  draft-ietf-idr-flowspec-redirect-ip-00.txt, instead of 'origin
> AS', the word 'last AS' is used.It is confusing.   Does the validation ne=
ed
> to consider the first AS or last AS?
>
>
>
> Regarding my second doubt, I could not get any pointers from
> draft-ietf-idr-bgp-flowspec-oid-06 .  Do we need to consider only BGP
> routes always?
>
>
>
> Thanks,
>
> Pavana.
>
>
>
>
> On Sat, Apr 28, 2018 at 3:37 AM, David Smith (djsmith) <djsmith@cisco.com=
>
> wrote:
>
> Hi Pavana,
>
>
>
> Your points are valid. With that said, I=E2=80=99ll defer you to
> draft-ietf-idr-bgp-flowspec-oid-05 (and later) and, specifically, section
> 4 (revised validation procedure) which addresses your points below.
>
>
>
> Co-incidentally, a WG last call was issued for draft-ietf-idr-bgp-flowspe=
c-oid-06
> yesterday.
>
>
>
> Regards,
>
>
>
> /dave
>
>
>
>
>
> *From:* PVLR Pavana Murthy <pvlrpm@gmail.com>
> *Sent:* Friday, April 13, 2018 1:51 AM
> *To:* idr wg <idr@ietf.org>; pmohapat@cumulusnetworks.com; David Smith
> (djsmith) <djsmith@cisco.com>
> *Subject:* Validation for BGP Flow-Spec Redirect to IP Action
>
>
>
> Hello,
>
>   In the draft  draft-ietf-idr-flowspec-redirect-ip-02.txt, the following
> procedure is mentioned to validate the extended community of 'Flowspec
>
> redirect to IP'.
>
>
>
>
>
>    BGP speakers that support the extended communities defined in this
>
>    draft MUST also, by default, enforce the following check when
>
>    receiving a flow-spec route from an EBGP peer: if the received flow-
>
>    spec route has a 'redirect to IP' extended community with a 'target
>
>    address' X (in the global administrator field) and the best matching
>
>    route to X is not a BGP route with *origin AS* matching the peer AS
>
>    then the extended community should be discarded and not propagated
>
>    along with the flow-spec route to other peers.
>
>
>
> *I have 2 doubts related to this statement.*
>
>
>
> *What is 'origin AS' here? Is it the AS no. that is first added to the AS=
_PATH? *
> *In the previous version of the draft its mentioned as the last AS in the=
 AS_PATH.*
> *Is it the last AS no. that has been added to the AS_PATH or the last AS =
no. from left in AS_PATH? *
>
>
>
> *What if the redirect target X is directly connected or reachable by a st=
atic route and its not advertised by EBGP?*
>
> *Do we need to consider that action invalid in that case?*
>
>
>
>
>
> Thanks,
>
> Pavana.
>
>
>
>
>
>
>
>
>
>
>
>
>

--00000000000063fc7d056b13fbc1
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><font face=3D"verdana, sans-serif">Hi Adam,</font><div><fo=
nt face=3D"verdana, sans-serif">=C2=A0 =C2=A0In=C2=A0draft-ietf-idr-bgp-flo=
wspec-oid-06(Revised Validation Procedure for BGP Flow Specifications), the=
 following is mentioned.=C2=A0

<span style=3D"color:rgb(34,34,34);font-size:small;font-style:normal;font-v=
ariant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spa=
cing:normal;text-align:start;text-indent:0px;text-transform:none;white-spac=
e:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-col=
or:initial;background-color:rgb(255,255,255);float:none;display:inline">Pro=
bably this could be the reason to use the=C2=A0 peer-as.</span></font></div=
><div><br></div><div><div><font face=3D"monospace, monospace">&quot;Note, c=
omparing only the last ASes is</font></div><div><font face=3D"monospace, mo=
nospace">sufficient for EBGP learned flow specification NLRIs. Requiring a<=
/font></div><div><font face=3D"monospace, monospace">full AS_PATH match wou=
ld limit origination of inter-domain flow</font></div><div><font face=3D"mo=
nospace, monospace">specifications to the origin (or first) AS of the best-=
match unicast</font></div><div><font face=3D"monospace, monospace">route fo=
r the destination prefix embedded in the flow specification</font></div><di=
v><font face=3D"monospace, monospace">only. As such, a full AS_PATH validit=
y check may prevent transit</font></div><div><font face=3D"monospace, monos=
pace">ASes from originating inter-domain flow specifications which is not</=
font></div><div><font face=3D"monospace, monospace">desirable.&quot;</font>=
</div></div><div><br></div><div><font face=3D"monospace, monospace"><br></f=
ont></div><div><font face=3D"verdana, sans-serif">Also in=C2=A0<span style=
=3D"color:rgb(0,0,0);font-size:13.3333px">draft-ietf-idr-flowspec-redirect-=
ip-00.txt, the term &#39;las AS&#39; is used instead of &#39;Origin As&#39;=
. Even the CISCO document (</span><font color=3D"#000000"><span style=3D"fo=
nt-size:13.3333px"><a href=3D"https://www.cisco.com/c/en/us/td/docs/routers=
/asr9000/software/asr9k_r5-2/routing/configuration/guide/b_routing_cg52xasr=
9k/b_routing_cg52xasr9k_chapter_011.html">https://www.cisco.com/c/en/us/td/=
docs/routers/asr9000/software/asr9k_r5-2/routing/configuration/guide/b_rout=
ing_cg52xasr9k/b_routing_cg52xasr9k_chapter_011.html</a>)=C2=A0=C2=A0</span=
></font><span style=3D"color:rgb(0,0,0);font-size:13.3333px">uses the term =
&#39;last AS&#39;.</span></font></div><div><font color=3D"#000000" face=3D"=
monospace, monospace"><span style=3D"font-size:13.3333px"><br></span></font=
></div><div><font color=3D"#000000" face=3D"monospace, monospace"><span sty=
le=3D"font-size:13.3333px"><br></span></font><pre class=3D"gmail-newpage" s=
tyle=3D"font-size:13.3333px;margin-top:0px;margin-bottom:0px;break-before:p=
age;color:rgb(0,0,0);font-style:normal;font-variant-ligatures:normal;font-v=
ariant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;t=
ext-indent:0px;text-transform:none;word-spacing:0px;text-decoration-style:i=
nitial;text-decoration-color:initial"><font face=3D"verdana, sans-serif">An=
yways, thanks for explaining the philosophy behind the validation.</font><f=
ont face=3D"monospace, monospace">
<br></font></pre><pre class=3D"gmail-newpage" style=3D"font-size:13.3333px;=
margin-top:0px;margin-bottom:0px;break-before:page;color:rgb(0,0,0);font-st=
yle:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weig=
ht:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transfor=
m:none;word-spacing:0px;text-decoration-style:initial;text-decoration-color=
:initial"><font face=3D"monospace, monospace">-Pavana.</font></pre>

</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Mo=
n, Apr 30, 2018 at 9:00 PM, Simpson, Adam 1. (Nokia - CA/Ottawa) <span dir=
=3D"ltr">&lt;<a href=3D"mailto:adam.1.simpson@nokia.com" target=3D"_blank">=
adam.1.simpson@nokia.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmai=
l_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left=
:1ex">





<div lang=3D"EN-CA" link=3D"blue" vlink=3D"purple">
<div class=3D"m_8575094244719231546WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif">Hi Pavana,<u></u><u></=
u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif">Peer-AS is not a consi=
deration in draft -02. I don=E2=80=99t recall why it was mentioned in an ea=
rlier version of the draft.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif">If the routers inside =
B and C enable the extra validation check (it is optional as explained in t=
he draft) then they would only install a flowspec
 route originated by a router inside A ,with a redirect-to-IP action, if th=
e redirect IP address itself was observed to originate inside A as well.<u>=
</u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif">So flow-spec routes or=
iginated by one AS can be valid in another AS, but only under restrictive c=
ircumstances.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif">-Adam<u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Nokia Pure Text Light&quot;,sans-serif"><u></u>=C2=A0<u></u></=
span></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span style=3D"font-=
size:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">PVLR Pavana Murthy =
&lt;<a href=3D"mailto:pvlrpm@gmail.com" target=3D"_blank">pvlrpm@gmail.com<=
/a>&gt;<br>
<b>Date: </b>Monday, April 30, 2018 at 2:24 AM<br>
<b>To: </b>&quot;Simpson, Adam 1. (Nokia - CA/Ottawa)&quot; &lt;<a href=3D"=
mailto:adam.1.simpson@nokia.com" target=3D"_blank">adam.1.simpson@nokia.com=
</a>&gt;<br>
<b>Cc: </b>&quot;David Smith (djsmith)&quot; &lt;<a href=3D"mailto:djsmith@=
cisco.com" target=3D"_blank">djsmith@cisco.com</a>&gt;, idr wg &lt;<a href=
=3D"mailto:idr@ietf.org" target=3D"_blank">idr@ietf.org</a>&gt;, Pradosh Mo=
hapatra &lt;<a href=3D"mailto:mpradosh@yahoo.com" target=3D"_blank">mprados=
h@yahoo.com</a>&gt;, &quot;<a href=3D"mailto:draft-ietf-idr-bgp-flowspec-oi=
d@ietf.org" target=3D"_blank">draft-ietf-idr-bgp-flowspec-<wbr>oid@ietf.org=
</a>&quot; &lt;<a href=3D"mailto:draft-ietf-idr-bgp-flowspec-oid@ietf.org" =
target=3D"_blank">draft-ietf-idr-bgp-flowspec-<wbr>oid@ietf.org</a>&gt;, &q=
uot;<a href=3D"mailto:ju1738@att.com" target=3D"_blank">ju1738@att.com</a>&=
quot; &lt;<a href=3D"mailto:ju1738@att.com" target=3D"_blank">ju1738@att.co=
m</a>&gt;, &quot;<a href=3D"mailto:jhaas@juniper.net" target=3D"_blank">jha=
as@juniper.net</a>&quot;
 &lt;<a href=3D"mailto:jhaas@juniper.net" target=3D"_blank">jhaas@juniper.n=
et</a>&gt;, &quot;<a href=3D"mailto:akarch@cisco.com" target=3D"_blank">aka=
rch@cisco.com</a>&quot; &lt;<a href=3D"mailto:akarch@cisco.com" target=3D"_=
blank">akarch@cisco.com</a>&gt;, &quot;<a href=3D"mailto:sairay@cisco.com" =
target=3D"_blank">sairay@cisco.com</a>&quot; &lt;<a href=3D"mailto:sairay@c=
isco.com" target=3D"_blank">sairay@cisco.com</a>&gt;, &quot;<a href=3D"mail=
to:pmohapat@cumulusnetworks.com" target=3D"_blank">pmohapat@cumulusnetworks=
.com</a>&quot; &lt;<a href=3D"mailto:pmohapat@cumulusnetworks.com" target=
=3D"_blank">pmohapat@cumulusnetworks.com</a>&gt;<wbr>, &quot;<a href=3D"mai=
lto:wim.henderickx@alcatel-lucent.be" target=3D"_blank">wim.henderickx@alca=
tel-<wbr>lucent.be</a>&quot; &lt;<a href=3D"mailto:wim.henderickx@alcatel-l=
ucent.be" target=3D"_blank">wim.henderickx@alcatel-<wbr>lucent.be</a>&gt;, =
&quot;<a href=3D"mailto:mtexier@arbor.net" target=3D"_blank">mtexier@arbor.=
net</a>&quot; &lt;<a href=3D"mailto:mtexier@arbor.net" target=3D"_blank">mt=
exier@arbor.net</a>&gt;</span></p><div><div class=3D"h5"><br>
<b>Subject: </b>Re: Validation for BGP Flow-Spec Redirect to IP Action<u></=
u><u></u></div></div><p></p>
</div><div><div class=3D"h5">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><a name=3D"m_8575094244=
719231546__MailOriginalBody">Hi Adam,
<u></u><u></u></a></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>=C2=A0 Thanks for=
 the reply. If its the first AS that is added to the AS_PATH, then &quot;th=
e redirect IP&quot; action received from the AS&#39;s that are not directly=
 connected may be
 invalid always.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>eg:<u></u><u></u>=
</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>=C2=A0 =C2=A0 A--=
-B----C<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>A, B and C are 3 =
routers in different AS&#39;s=C2=A0 1, 2 and 3 respectively.=C2=A0<u></u><u=
></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>A advertises a ro=
ute for target X and also a Flowspec route with &quot;redirect=C2=A0 IP(tar=
get X)&quot;. C receives these routes via B.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>Now the the origi=
n AS or first AS in the AS_PATH of the route to target X is 1 but the peer-=
AS is 2 since the route is received from B.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>Since the peer-AS=
 does not match the first AS of the best route target X,=C2=A0 this redirec=
t IP action is considered invalid.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>Please let me kno=
w if that&#39;s expected.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>--Pavana.<u></u><=
u></u></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span>On Mon, Apr 30, 2=
018 at 1:12 AM, Simpson, Adam 1. (Nokia - CA/Ottawa) &lt;</span><a href=3D"=
mailto:adam.1.simpson@nokia.com" target=3D"_blank"><span>adam.1.simpson@nok=
ia.com</span><span></span></a><span>&gt;
 wrote:<u></u><u></u></span></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-family:&quot;Noki=
a Pure Text Light&quot;,sans-serif">Hi Pavana,</span><u></u><u></u></span><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-family:&quot;Noki=
a Pure Text Light&quot;,sans-serif">=C2=A0</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-family:&quot;Noki=
a Pure Text Light&quot;,sans-serif">The purpose of this text in the draft w=
as to close the door on the ability for an accidental/malicious originator =
of a flow-spec
 route in AS=3Dx from redirecting flows towards a target IP address in some=
 other AS=3Dy.
</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-family:&quot;Noki=
a Pure Text Light&quot;,sans-serif">=C2=A0</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-family:&quot;Noki=
a Pure Text Light&quot;,sans-serif">So, in this context we are interested i=
n looking at the first AS in AS_PATH of the flow-spec route, not the most r=
ecently
 added AS in the AS_PATH (which would be the =E2=80=98neighbor AS=E2=80=99)=
.</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-family:&quot;Noki=
a Pure Text Light&quot;,sans-serif">=C2=A0</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-family:&quot;Noki=
a Pure Text Light&quot;,sans-serif">The route that resolves the target redi=
rect IP address could be a BGP route or it could be a non-BGP route, despit=
e the wording
 in the draft. If it is a BGP route the origin AS is determined as describe=
d above. If is a non-BGP route it would probably be appropriate to consider=
 the route as locally originated (i.e. the same as a BGP route with null/em=
pty AS_PATH or having only confed
 related elements).</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-family:&quot;Noki=
a Pure Text Light&quot;,sans-serif">=C2=A0</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-family:&quot;Noki=
a Pure Text Light&quot;,sans-serif">I hope this helps.</span><u></u><u></u>=
</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-family:&quot;Noki=
a Pure Text Light&quot;,sans-serif">=C2=A0</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-family:&quot;Noki=
a Pure Text Light&quot;,sans-serif">-Adam</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-family:&quot;Noki=
a Pure Text Light&quot;,sans-serif">=C2=A0</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-family:&quot;Noki=
a Pure Text Light&quot;,sans-serif">=C2=A0</span><u></u><u></u></span></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><b><span style=3D"font-size:12.0pt;color:black">From:
</span></b></span><span><span style=3D"font-size:12.0pt;color:black">PVLR P=
avana Murthy &lt;</span></span><a href=3D"mailto:pvlrpm@gmail.com" target=
=3D"_blank"><span><span style=3D"font-size:12.0pt">pvlrpm@gmail.com</span><=
/span><span></span></a><span><span style=3D"font-size:12.0pt;color:black">&=
gt;<br>
<b>Date: </b>Saturday, April 28, 2018 at 12:45 AM<br>
<b>To: </b>&quot;David Smith (djsmith)&quot; &lt;</span></span><a href=3D"m=
ailto:djsmith@cisco.com" target=3D"_blank"><span><span style=3D"font-size:1=
2.0pt">djsmith@cisco.com</span></span><span></span></a><span><span style=3D=
"font-size:12.0pt;color:black">&gt;<br>
<b>Cc: </b>idr wg &lt;</span></span><a href=3D"mailto:idr@ietf.org" target=
=3D"_blank"><span><span style=3D"font-size:12.0pt">idr@ietf.org</span></spa=
n><span></span></a><span><span style=3D"font-size:12.0pt;color:black">&gt;,
 Pradosh Mohapatra &lt;</span></span><a href=3D"mailto:mpradosh@yahoo.com" =
target=3D"_blank"><span><span style=3D"font-size:12.0pt">mpradosh@yahoo.com=
</span></span><span></span></a><span><span style=3D"font-size:12.0pt;color:=
black">&gt;,
 &quot;</span></span><a href=3D"mailto:draft-ietf-idr-bgp-flowspec-oid@ietf=
.org" target=3D"_blank"><span><span style=3D"font-size:12.0pt">draft-ietf-i=
dr-bgp-flowspec-<wbr>oid@ietf.org</span></span><span></span></a><span><span=
 style=3D"font-size:12.0pt;color:black">&quot;
 &lt;</span></span><a href=3D"mailto:draft-ietf-idr-bgp-flowspec-oid@ietf.o=
rg" target=3D"_blank"><span><span style=3D"font-size:12.0pt">draft-ietf-idr=
-bgp-flowspec-<wbr>oid@ietf.org</span></span><span></span></a><span><span s=
tyle=3D"font-size:12.0pt;color:black">&gt;,
 &quot;</span></span><a href=3D"mailto:ju1738@att.com" target=3D"_blank"><s=
pan><span style=3D"font-size:12.0pt">ju1738@att.com</span></span><span></sp=
an></a><span><span style=3D"font-size:12.0pt;color:black">&quot;
 &lt;</span></span><a href=3D"mailto:ju1738@att.com" target=3D"_blank"><spa=
n><span style=3D"font-size:12.0pt">ju1738@att.com</span></span><span></span=
></a><span><span style=3D"font-size:12.0pt;color:black">&gt;,
 &quot;</span></span><a href=3D"mailto:jhaas@juniper.net" target=3D"_blank"=
><span><span style=3D"font-size:12.0pt">jhaas@juniper.net</span></span><spa=
n></span></a><span><span style=3D"font-size:12.0pt;color:black">&quot;
 &lt;</span></span><a href=3D"mailto:jhaas@juniper.net" target=3D"_blank"><=
span><span style=3D"font-size:12.0pt">jhaas@juniper.net</span></span><span>=
</span></a><span><span style=3D"font-size:12.0pt;color:black">&gt;,
 &quot;</span></span><a href=3D"mailto:akarch@cisco.com" target=3D"_blank">=
<span><span style=3D"font-size:12.0pt">akarch@cisco.com</span></span><span>=
</span></a><span><span style=3D"font-size:12.0pt;color:black">&quot;
 &lt;</span></span><a href=3D"mailto:akarch@cisco.com" target=3D"_blank"><s=
pan><span style=3D"font-size:12.0pt">akarch@cisco.com</span></span><span></=
span></a><span><span style=3D"font-size:12.0pt;color:black">&gt;,
 &quot;</span></span><a href=3D"mailto:sairay@cisco.com" target=3D"_blank">=
<span><span style=3D"font-size:12.0pt">sairay@cisco.com</span></span><span>=
</span></a><span><span style=3D"font-size:12.0pt;color:black">&quot;
 &lt;</span></span><a href=3D"mailto:sairay@cisco.com" target=3D"_blank"><s=
pan><span style=3D"font-size:12.0pt">sairay@cisco.com</span></span><span></=
span></a><span><span style=3D"font-size:12.0pt;color:black">&gt;,
 &quot;</span></span><a href=3D"mailto:pmohapat@cumulusnetworks.com" target=
=3D"_blank"><span><span style=3D"font-size:12.0pt">pmohapat@cumulusnetworks=
.com</span></span><span></span></a><span><span style=3D"font-size:12.0pt;co=
lor:black">&quot;
 &lt;</span></span><a href=3D"mailto:pmohapat@cumulusnetworks.com" target=
=3D"_blank"><span><span style=3D"font-size:12.0pt">pmohapat@cumulusnetworks=
.com</span></span><span></span></a><span><span style=3D"font-size:12.0pt;co=
lor:black">&gt;<wbr>,
 &quot;</span></span><a href=3D"mailto:wim.henderickx@alcatel-lucent.be" ta=
rget=3D"_blank"><span><span style=3D"font-size:12.0pt">wim.henderickx@alcat=
el-<wbr>lucent.be</span></span><span></span></a><span><span style=3D"font-s=
ize:12.0pt;color:black">&quot;
 &lt;</span></span><a href=3D"mailto:wim.henderickx@alcatel-lucent.be" targ=
et=3D"_blank"><span><span style=3D"font-size:12.0pt">wim.henderickx@alcatel=
-<wbr>lucent.be</span></span><span></span></a><span><span style=3D"font-siz=
e:12.0pt;color:black">&gt;,
 &quot;Simpson, Adam 1. (Nokia - CA/Ottawa)&quot; &lt;</span></span><a href=
=3D"mailto:adam.1.simpson@nokia.com" target=3D"_blank"><span><span style=3D=
"font-size:12.0pt">adam.1.simpson@nokia.com</span></span><span></span></a><=
span><span style=3D"font-size:12.0pt;color:black">&gt;,
 &quot;</span></span><a href=3D"mailto:mtexier@arbor.net" target=3D"_blank"=
><span><span style=3D"font-size:12.0pt">mtexier@arbor.net</span></span><spa=
n></span></a><span><span style=3D"font-size:12.0pt;color:black">&quot;
 &lt;</span></span><a href=3D"mailto:mtexier@arbor.net" target=3D"_blank"><=
span><span style=3D"font-size:12.0pt">mtexier@arbor.net</span></span><span>=
</span></a><span><span style=3D"font-size:12.0pt;color:black">&gt;<br>
<b>Subject: </b>Re: Validation for BGP Flow-Spec Redirect to IP Action</spa=
n><u></u><u></u></span></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><a name=3D"m_8575094244719231546_m_5701887331653252831__MailOriginalB=
ody">Hello,
</a><u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>=C2=A0 Including all the authors mentioned in=C2=A0draft-ietf-idr-flo=
wspec-<wbr>redirect-ip-02, as the alias did not work. Also pasting doubts a=
gain here.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span style=3D"font-family:&quot;Tahoma&quot;,sans-serif">In the draf=
t=C2=A0</span></span><span><span style=3D"font-size:18.0pt;font-family:&quo=
t;Tahoma&quot;,sans-serif">=C2=A0</span></span><span><span style=3D"font-fa=
mily:&quot;Tahoma&quot;,sans-serif;color:black">draft-ietf-idr-<wbr>flowspe=
c-redirect-ip-02.txt,
 the following procedure is mentioned to validate the extended community of=
 &#39;Flowspec
</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span style=3D"font-family:&quot;Tahoma&quot;,sans-serif;color:black"=
>redirect to IP&#39;.</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<pre style=3D"margin-left:72.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><span style=3D"color:black">=C2=A0=C2=A0 BGP speakers that support the ex=
tended communities defined in this</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;background:white"><span><span style=3D"col=
or:black">=C2=A0=C2=A0 draft MUST also, by default, enforce the following c=
heck when</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;background:white"><span><span style=3D"col=
or:black">=C2=A0=C2=A0 receiving a flow-spec route from an EBGP peer: if th=
e received flow-</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><span style=3D"color:black">=C2=A0=C2=A0 spec route has a &#39;redirect t=
o IP&#39; extended community with a &#39;target</span><u></u><u></u></span>=
</pre>
<pre style=3D"margin-left:72.0pt;background:white"><span><span style=3D"col=
or:black">=C2=A0=C2=A0 address&#39; X (in the global administrator field) a=
nd the best matching</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;background:white"><span><span style=3D"col=
or:black">=C2=A0=C2=A0 route to X is not a BGP route with <b>origin AS</b> =
matching the peer AS</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;background:white"><span><span style=3D"col=
or:black">=C2=A0=C2=A0 then the extended community should be discarded and =
not propagated</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;background:white"><span><span style=3D"col=
or:black">=C2=A0=C2=A0 along with the flow-spec route to other peers. </spa=
n><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><span style=3D"color:black">=C2=A0</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><b><span style=3D"color:black">I have 2 doubts related to this statement.=
</span></b><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><span style=3D"color:black">=C2=A0</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><b><span style=3D"color:black">What is &#39;origin AS&#39; here? Is it th=
e AS no. that is first added to the AS_PATH? </span></b><span style=3D"colo=
r:black"><br><b>In the previous version of the draft its mentioned as the l=
ast AS in the AS_PATH.</b><br><b>Is it the last AS no. that has been added =
to the AS_PATH or the last AS no. from left in AS_PATH? </b></span><u></u><=
u></u></span></pre>
<pre style=3D"margin-left:72.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><span style=3D"color:black">=C2=A0</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><b><span style=3D"color:black">What if the redirect target X is directly =
connected or reachable by a static route and its not advertised by EBGP?</s=
pan></b><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;background:white;white-space:pre-wrap;font=
-variant-ligatures:normal;font-variant-caps:normal;text-align:start;text-de=
coration-style:initial;text-decoration-color:initial;word-spacing:0px"><spa=
n><b><span style=3D"color:black">Do we need to consider that action invalid=
 in that case?</span></b><u></u><u></u></span></pre>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt;margin-left:72.0pt">
<span><u></u>=C2=A0<u></u></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>Thanks,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>Pavana.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>=C2=A0<u></u><u></u></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>=C2=A0<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>On Sat, Apr 28, 2018 at 10:10 AM, PVLR Pavana Murthy &lt;</span><a hr=
ef=3D"mailto:pvlrpm@gmail.com" target=3D"_blank"><span>pvlrpm@gmail.com</sp=
an><span></span></a><span>&gt;
 wrote:<u></u><u></u></span></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-=
bottom:5.0pt">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>Hi Dave, <u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>=C2=A0 =C2=A0Thanks for the reply and including respective draft auth=
or aliases.=C2=A0=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>I went through the latest <span style=3D"color:#222222;background:whi=
te">
draft-ietf-idr-bgp-flowspec-<wbr>oid-06. It calls the first AS the Origin A=
S. Is it so?=C2=A0</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span style=3D"color:#222222;background:white">If that&#39;s the case=
, the validation will fail for any &#39;redirect IP&#39; actions coming fro=
m the AS other than neighbor AS. Is that the intention?</span><u></u><u></u=
></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span style=3D"color:#222222;background:white">Also In=C2=A0=C2=A0dra=
ft-ietf-idr-flowspec-<wbr>redirect-ip-00.txt, instead of &#39;origin AS&#39=
;, the word &#39;last AS&#39; is used.It is confusing.=C2=A0 =C2=A0Does the=
 validation need to consider the first
 AS or last AS?=C2=A0</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt;margin-left:72.0pt">
<span><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span style=3D"color:#222222;background:white">Regarding my second do=
ubt, I could not get any pointers from=C2=A0 draft-ietf-idr-bgp-flowspec-<w=
br>oid-06=C2=A0.=C2=A0 Do we need to consider only BGP routes always?</span=
><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt;margin-left:72.0pt">
<span><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span style=3D"color:#222222;background:white">Thanks,</span><u></u><=
u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span style=3D"color:#222222;background:white">Pavana.<br>
=C2=A0</span><u></u><u></u></span></p>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>=C2=A0<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>On Sat, Apr 28, 2018 at 3:37 AM, David Smith (djsmith) &lt;</span><a =
href=3D"mailto:djsmith@cisco.com" target=3D"_blank"><span>djsmith@cisco.com=
</span><span></span></a><span>&gt;
 wrote:<u></u><u></u></span></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US">Hi Pavana,</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US">=C2=A0</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US">Your points are valid. With that said, I=E2=80=
=99ll defer you to draft-ietf-idr-bgp-flowspec-<wbr>oid-05 (and later) and,=
 specifically, section 4 (revised validation procedure) which addresses you=
r points below.</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US">=C2=A0</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US">Co-incidentally, a WG last call was issued for d=
raft-ietf-idr-bgp-flowspec-<wbr>oid-06 yesterday.
</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US">=C2=A0</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US">Regards,</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US">=C2=A0</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US">/dave</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US">=C2=A0</span><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US" style=3D"color:#1f497d">=C2=A0</span><u></u><u><=
/u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><b><span lang=3D"EN-US">From:</span></b></span><span><span lang=3D"EN=
-US"> PVLR Pavana Murthy &lt;</span></span><a href=3D"mailto:pvlrpm@gmail.c=
om" target=3D"_blank"><span><span lang=3D"EN-US">pvlrpm@gmail.com</span></s=
pan><span></span></a><span><span lang=3D"EN-US">&gt;
<br>
<b>Sent:</b> Friday, April 13, 2018 1:51 AM<br>
<b>To:</b> idr wg &lt;</span></span><a href=3D"mailto:idr@ietf.org" target=
=3D"_blank"><span><span lang=3D"EN-US">idr@ietf.org</span></span><span></sp=
an></a><span><span lang=3D"EN-US">&gt;;
</span></span><a href=3D"mailto:pmohapat@cumulusnetworks.com" target=3D"_bl=
ank"><span><span lang=3D"EN-US">pmohapat@cumulusnetworks.com</span></span><=
span></span></a><span><span lang=3D"EN-US">;
 David Smith (djsmith) &lt;</span></span><a href=3D"mailto:djsmith@cisco.co=
m" target=3D"_blank"><span><span lang=3D"EN-US">djsmith@cisco.com</span></s=
pan><span></span></a><span><span lang=3D"EN-US">&gt;<br>
<b>Subject:</b> Validation for BGP Flow-Spec Redirect to IP Action</span><u=
></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US">=C2=A0</span><u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US" style=3D"font-family:&quot;Tahoma&quot;,sans-ser=
if">Hello,</span><u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US" style=3D"font-family:&quot;Tahoma&quot;,sans-ser=
if">=C2=A0 In the draft=C2=A0</span></span><span><span lang=3D"EN-US" style=
=3D"font-size:18.0pt;font-family:&quot;Tahoma&quot;,sans-serif">=C2=A0</spa=
n></span><span><span lang=3D"EN-US" style=3D"font-family:&quot;Tahoma&quot;=
,sans-serif;color:black">draft-ietf-idr-<wbr>flowspec-redirect-ip-02.txt,
 the following procedure is mentioned to validate the extended community of=
 &#39;Flowspec
</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US" style=3D"font-family:&quot;Tahoma&quot;,sans-ser=
if;color:black">redirect to IP&#39;.</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US">=C2=A0</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><b><span lang=3D"EN-US" style=3D"font-size:18.0pt;font-family:&quot;C=
ourier New&quot;;color:black">=C2=A0</span></b><u></u><u></u></span></p>
<pre style=3D"margin-left:72.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"color:=
black">=C2=A0=C2=A0 BGP speakers that support the extended communities defi=
ned in this</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt"><span><span lang=3D"EN-US" style=3D"color=
:black">=C2=A0=C2=A0 draft MUST also, by default, enforce the following che=
ck when</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt"><span><span lang=3D"EN-US" style=3D"color=
:black">=C2=A0=C2=A0 receiving a flow-spec route from an EBGP peer: if the =
received flow-</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"color:=
black">=C2=A0=C2=A0 spec route has a &#39;redirect to IP&#39; extended comm=
unity with a &#39;target</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt"><span><span lang=3D"EN-US" style=3D"color=
:black">=C2=A0=C2=A0 address&#39; X (in the global administrator field) and=
 the best matching</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt"><span><span lang=3D"EN-US" style=3D"color=
:black">=C2=A0=C2=A0 route to X is not a BGP route with <b>origin AS</b> ma=
tching the peer AS</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt"><span><span lang=3D"EN-US" style=3D"color=
:black">=C2=A0=C2=A0 then the extended community should be discarded and no=
t propagated</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt"><span><span lang=3D"EN-US" style=3D"color=
:black">=C2=A0=C2=A0 along with the flow-spec route to other peers. </span>=
<u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"color:=
black">=C2=A0</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><b><span lang=3D"EN-US" style=3D"col=
or:black">I have 2 doubts related to this statement.</span></b><u></u><u></=
u></span></pre>
<pre style=3D"margin-left:72.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"color:=
black">=C2=A0</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><b><span lang=3D"EN-US" style=3D"col=
or:black">What is &#39;origin AS&#39; here? Is it the AS no. that is first =
added to the AS_PATH? </span></b></span><span><span lang=3D"EN-US" style=3D=
"color:black"><br><b>In the previous version of the draft its mentioned as =
the last AS in the AS_PATH.</b><br><b>Is it the last AS no. that has been a=
dded to the AS_PATH or the last AS no. from left in AS_PATH? </b></span><u>=
</u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"color:=
black">=C2=A0</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><b><span lang=3D"EN-US" style=3D"col=
or:black">What if the redirect target X is directly connected or reachable =
by a static route and its not advertised by EBGP?</span></b><u></u><u></u><=
/span></pre>
<pre style=3D"margin-left:72.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><b><span lang=3D"EN-US" style=3D"col=
or:black">Do we need to consider that action invalid in that case?</span></=
b><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"color:=
black">=C2=A0</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"color:=
black">=C2=A0</span><u></u><u></u></span></pre>
<pre style=3D"margin-left:72.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"font-f=
amily:&quot;Tahoma&quot;,sans-serif;color:black">Thanks,</span><u></u><u></=
u></span></pre>
<pre style=3D"margin-left:72.0pt;font-variant-ligatures:normal;font-variant=
-caps:normal;text-align:start;text-decoration-style:initial;text-decoration=
-color:initial;word-spacing:0px"><span><span lang=3D"EN-US" style=3D"font-f=
amily:&quot;Tahoma&quot;,sans-serif;color:black">Pavana.</span><u></u><u></=
u></span></pre>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><b><span lang=3D"EN-US" style=3D"font-size:18.0pt;font-family:&quot;C=
ourier New&quot;;color:black">=C2=A0</span></b><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><span lang=3D"EN-US">=C2=A0</span><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span><b><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-family:&quot;C=
ourier New&quot;;color:black">=C2=A0</span></b><u></u><u></u></span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>=C2=A0<u></u><u></u></span></p>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span>=C2=A0<u></u><u></u></span></p>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span><u></u>=C2=A0<u><=
/u></span></p>
</div>
</div></div></div>
</div>

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

--00000000000063fc7d056b13fbc1--


From nobody Mon Apr 30 17:06:46 2018
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Extended BGP Administrative Shutdown Communication
        Authors         : Job Snijders
                          Jakob Heitz
                          John Scudder
                          Alexander Azimov
	Filename        : draft-ietf-idr-rfc8203bis-00.txt
	Pages           : 7
	Date            : 2018-04-30

Abstract:
   This document enhances the BGP Cease NOTIFICATION message
   "Administrative Shutdown" and "Administrative Reset" subcodes for
   operators to transmit a short freeform message to describe why a BGP
   session was shutdown or reset.  This document updates RFC 4486 and
   obsoletes RFC 8203 by defining an Extended BGP Administrative
   Shutdown Communication to improve communication using multibyte
   character sets.



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