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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: "Ali Sajassi (sajassi)" <sajassi=40cisco.com@dmarc.ietf.org>, Susan Hares <shares@ndzh.com>, "bess@ietf.org" <bess@ietf.org>, "idr@ietf.org" <idr@ietf.org>
CC: "Hu, Jun (Nokia - US/Mountain View)" <jun.hu@nokia.com>
Thread-Topic: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/VI2v0OxlLs9j4UQdIYTblgiop_Y>
Subject: Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn
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I fully agree with Ali.
I think the VXLAN TLV only makes sense for other families, and not for EVPN=
. We=92ve done EVPN public interoperability for a few years and everyone us=
es the BGP encap extends community.

Thanks,
Jorge

________________________________
From: BESS <bess-bounces@ietf.org> on behalf of Ali Sajassi (sajassi) <saja=
ssi=3D40cisco.com@dmarc.ietf.org>
Sent: Saturday, August 1, 2020 03:18
To: Susan Hares; bess@ietf.org; idr@ietf.org
Cc: Hu, Jun (Nokia - US/Mountain View)
Subject: Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn

Sue,

I am afraid if we don=92t clean up the draft, it can cause confusion as it =
has already and result in immediate errata filing for it after publication.=
 A sub-bullet got added to the latest rev (rev17) that is not correct. It s=
ays that the VxLAN sub-tlv is sent with EVPN route when V bit not set. Howe=
ver, EVPN never uses this sub-tlv as its routes has all the needed info. Fu=
rthermore, RFC 8365 is very clear that EVPN uses Tunnel Encapsulation Exten=
ded Community (per section 4.1). As I said, I am not aware of any of the ve=
ndors using these sub-TVLs and it is easy to have a quick poll.

Regarding the paragraph that got omitted, it is making it much more ambiguo=
us than it used to. I would opt for clarifying the paragraph rather than re=
moving it. If needed I can provide an updated paragraph. Section 9 of RFC 8=
365 specifies how a VPN multicast route can be advertised with PMSI tunnel =
attribute and Encapsulation extended community and has been implemented by =
many vendors.

Cheers,
Ali


From: Susan Hares <shares@ndzh.com>
Date: Friday, July 31, 2020 at 5:02 AM
To: Cisco Employee <sajassi@cisco.com>, "bess@ietf.org" <bess@ietf.org>, "i=
dr@ietf.org" <idr@ietf.org>
Cc: "'Hu, Jun (Nokia - US/Mountain View)'" <jun.hu@nokia.com>
Subject: RE: IPSec Tunnels and draft-sajassi-bess-secure-evpn

Ali:

It is wise to start with the RFC6514 and the draft-ietf-idr-tunnel-encapsul=
ation draft.

[WG chair hat on]
The tunnel-encapsulation draft has passed general WG LC =96 so it is inappr=
opriate to call for the request to remove these sections.  The WG LC that i=
s currently running is whether to remove the =93AS=94 field from the tunnel=
 endpoint field, and replace it with a reserved field.

The implementation page is on:
https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%20implemen=
tations

If you wish to provide information on the cisco implementation, you are wel=
come to add information on the page.
I can call for an update to the page from vendors.

[WG chair hat off[
[Document shepherd hat on]

The issue is during the edits the text from RFC6514 from Eric Rosen was unc=
lear.  The text was:



   It has been suggested that it may sometimes be useful to attach a
   Tunnel Encapsulation attribute to a BGP UPDATE message that is also
   carrying a PMSI (Provider Multicast Service Interface) Tunnel
   attribute [RFC6514<https://datatracker.ietf.org/doc/html/rfc6514>].  If =
the PMSI Tunnel attribute specifies an IP
   tunnel, the Tunnel Encapsulation attribute could be used to provide
   additional information about the IP tunnel.  The usage of the Tunnel
   Encapsulation attribute in combination with the PMSI Tunnel attribute
   is outside the scope of this document.

Since the text itself was unclear what additional information could be prov=
ided, the authors removed it from the draft.

As we had not received any feedback about active RFC6514 interactions on th=
e list.

[document shepherd off]

If you have an implementation of the interaction between the RF6514 and tun=
nel encapsulation, it would be valuable to provide:

a)  either a draft specifying the interaction you wish to IDR WG, or
b)  comments that could replace the original the original text.

Since the IDR draft has gone through multiple WG LC and a very complete rev=
iew from Alvaro =96 so a quick response would be appreciated.   IMHO a draf=
t on the interaction between RFC6514 and the tunnel-encapsulation draft =96=
 would be the best thing at this point.  Let me know if you are interested =
in working on such a draft.

Sue


From: Ali Sajassi (sajassi) [mailto:sajassi@cisco.com]
Sent: Friday, July 31, 2020 1:54 AM
To: Susan Hares; bess@ietf.org; idr@ietf.org
Cc: 'Hu, Jun (Nokia - US/Mountain View)'
Subject: Re: IPSec Tunnels and draft-sajassi-bess-secure-evpn

<added idr@ietf.org>

Sue,

Before getting to the discussions of the three IPsec proposals, there are s=
ome elements of draft-ietf-idr-tunnel-encaps-17.txt that I can see might ha=
ve caused some confusions and I=92d like to get those sorted out first.

The tunnel-encap draft specifies sub-tlv for VxLAN, VxLAN GDP, and NVGRE in=
 sections 3.2.1, 3.2.2, and 3.2.3. I am not aware of any vendor that has im=
plemented these sub-tlvs because the info in these sub-tlv already exist in=
 EVPN routes (e.g., MAC addresses, Ethernet Tags, etc.) which they have imp=
lemented it. Therefore, all the vendors that I am aware of use Extended Com=
munity  defined in section 4.1  along with EVPN routes to signal VxLAN and =
GENEVE tunnel types. Furthermore, I am not aware of anyone using NVGRE enca=
p! So, as the first step, we should remove these three sections from the dr=
aft if there is no objection.

Cheers,
Ali

From: Susan Hares <shares@ndzh.com>
Date: Tuesday, July 28, 2020 at 8:30 AM
To: Cisco Employee <sajassi@cisco.com>, "bess@ietf.org" <bess@ietf.org>
Cc: "'Hu, Jun (Nokia - US/Mountain View)'" <jun.hu@nokia.com>
Subject: IPSec Tunnels and draft-sajassi-bess-secure-evpn

Ali and bess WG:

IDR has 3 proposals for IPsec tunnels that impact draft-ietf-idr-tunnel-enc=
aps-17.txt.  As an IDR co-chair/shepherd,  I have been discussing these thr=
ee drafts (Ali and two other authors sets) to try to find out if we can hav=
e one general solutions.

The discussion has been very fruitful to point up BGP issues of interoperab=
ility, security, privacy, manageability, and scaling.  For example, there i=
s a lack of a clear specification between RFC6514 (PMSI tunnel attribute) a=
nd the tunnel-encaps draft that specifies how these drafts interoperate.  I=
 suspect the bess and idr chairs will need to discuss if tunnel-encaps has =
to address this point.

I wrote up my ideas in draft-hares-idr-bgp-ipsec-analysis-00.txt so the aut=
hors could tell me what I misunderstood.   You=92ll find this draft stops h=
alf way.  I have the rest of the draft written, but I wanted feedback from =
all the author teams before sending it out.

After hearing some of the details from the authors, I would like to sponsor=
 an IDR interim so we could discuss these issues at length.   If you think =
this is a good idea, please let me know.

One other thing=85 unfortunately, I scheduled a set of meetings for EDT tim=
e after IETF meetings this week.   Your next response will occur from 11-16=
 UTC on Wednesday.

Cheerily, Sue



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<div dir=3D"ltr">
<div></div>
<div data-ogsc=3D"" style=3D"">
<div>I fully agree with Ali.</div>
<div dir=3D"ltr">I think the VXLAN TLV only makes sense for other families,=
 and not for EVPN. We=92ve done EVPN public interoperability for a few year=
s and everyone uses the BGP encap extends community.</div>
<div dir=3D"ltr"><br>
</div>
<div dir=3D"ltr">Thanks,</div>
<div dir=3D"ltr">Jorge&nbsp;</div>
<div><br>
</div>
<div class=3D"ms-outlook-ios-signature"></div>
</div>
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<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif"><b=
>From:</b> BESS &lt;bess-bounces@ietf.org&gt; on behalf of Ali Sajassi (saj=
assi) &lt;sajassi=3D40cisco.com@dmarc.ietf.org&gt;<br>
<b>Sent:</b> Saturday, August 1, 2020 03:18<br>
<b>To:</b> Susan Hares; bess@ietf.org; idr@ietf.org<br>
<b>Cc:</b> Hu, Jun (Nokia - US/Mountain View)<br>
<b>Subject:</b> Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn
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<p class=3D"MsoNormal">Sue,</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">I am afraid if we don=92t clean up the draft, it can=
 cause confusion as it has already and result in immediate errata filing fo=
r it after publication. A sub-bullet got added to the latest rev (rev17) th=
at is not correct. It says that the
 VxLAN sub-tlv is sent with EVPN route when V bit not set. However, EVPN ne=
ver uses this sub-tlv as its routes has all the needed info. Furthermore, R=
FC 8365 is very clear that EVPN uses Tunnel Encapsulation Extended Communit=
y (per section 4.1). As I said,
 I am not aware of any of the vendors using these sub-TVLs and it is easy t=
o have a quick poll.</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Regarding the paragraph that got omitted, it is maki=
ng it much more ambiguous than it used to. I would opt for clarifying the p=
aragraph rather than removing it. If needed I can provide an updated paragr=
aph. Section 9 of RFC 8365 specifies
 how a VPN multicast route can be advertised with PMSI tunnel attribute and=
 Encapsulation extended community and has been implemented by many vendors.=
</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Cheers,</p>
<p class=3D"MsoNormal">Ali</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">&nbsp;</p>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size: 12pt; color: black;">Fr=
om: </span>
</b><span style=3D"font-size: 12pt; color: black;">Susan Hares &lt;shares@n=
dzh.com&gt;<br>
<b>Date: </b>Friday, July 31, 2020 at 5:02 AM<br>
<b>To: </b>Cisco Employee &lt;sajassi@cisco.com&gt;, &quot;bess@ietf.org&qu=
ot; &lt;bess@ietf.org&gt;, &quot;idr@ietf.org&quot; &lt;idr@ietf.org&gt;<br=
>
<b>Cc: </b>&quot;'Hu, Jun (Nokia - US/Mountain View)'&quot; &lt;jun.hu@noki=
a.com&gt;<br>
<b>Subject: </b>RE: IPSec Tunnels and draft-sajassi-bess-secure-evpn </span=
></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<p class=3D"MsoNormal"><span style=3D"color: rgb(31, 73, 125);">Ali:</span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color: rgb(31, 73, 125);">&nbsp;</spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color: rgb(31, 73, 125);">It is wise =
to start with the RFC6514 and the draft-ietf-idr-tunnel-encapsulation draft=
.&nbsp;&nbsp;
</span></p>
<p class=3D"MsoNormal"><span style=3D"color: rgb(31, 73, 125);">&nbsp;</spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color: rgb(31, 73, 125);">[WG chair h=
at on] </span>
</p>
<p class=3D"MsoNormal"><span style=3D"color: rgb(31, 73, 125);">The tunnel-=
encapsulation draft has passed general WG LC =96 so it is inappropriate to =
call for the request to remove these sections.&nbsp; The WG LC that is curr=
ently running is whether to remove the =93AS=94
 field from the tunnel endpoint field, and replace it with a reserved field=
. </span>
</p>
<p class=3D"MsoNormal"><span style=3D"color: rgb(31, 73, 125);">&nbsp;</spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color: rgb(31, 73, 125);">The impleme=
ntation page is on:
</span></p>
<p class=3D"MsoNormal"><a href=3D"https://trac.ietf.org/trac/idr/wiki/draft=
-ietf-idr-tunnel-encaps%20implementations" data-ogsc=3D"" style=3D"">https:=
//trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%20implementation=
s</a></p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">If you wish to provide information on the cisco impl=
ementation, you are welcome to add information on the page.
</p>
<p class=3D"MsoNormal">I can call for an update to the page from vendors.</=
p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">[WG chair hat off[</p>
<p class=3D"MsoNormal">[Document shepherd hat on] </p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">The issue is during the edits the text from RFC6514 =
from Eric Rosen was unclear.&nbsp; The text was:
</p>
<p class=3D"MsoNormal" style=3D"background-color: white; word-break: break-=
all;"><span style=3D"font-size: 10.5pt; font-family: &quot;Courier New&quot=
;; color: black;"><br>
<br>
<br>
</span></p>
<p class=3D"MsoNormal" style=3D"background-color: white; word-break: break-=
all;"><span style=3D"font-size: 10.5pt; font-family: &quot;Courier New&quot=
;; color: black;">&nbsp;&nbsp;&nbsp;It has been suggested that it may somet=
imes be useful to attach a</span></p>
<p class=3D"MsoNormal" style=3D"background-color: white; word-break: break-=
all;"><span style=3D"font-size: 10.5pt; font-family: &quot;Courier New&quot=
;; color: black;">&nbsp;&nbsp; Tunnel Encapsulation attribute to a BGP UPDA=
TE message that is also</span></p>
<p class=3D"MsoNormal" style=3D"background-color: white; word-break: break-=
all;"><span style=3D"font-size: 10.5pt; font-family: &quot;Courier New&quot=
;; color: black;">&nbsp;&nbsp; carrying a PMSI (Provider Multicast Service =
Interface) Tunnel</span></p>
<p class=3D"MsoNormal" style=3D"background-color: white; word-break: break-=
all;"><span style=3D"font-size: 10.5pt; font-family: &quot;Courier New&quot=
;; color: black;">&nbsp;&nbsp; attribute [<a href=3D"https://datatracker.ie=
tf.org/doc/html/rfc6514" data-ogsc=3D"" style=3D""><span style=3D"color: rg=
b(61, 34, 179);">RFC6514</span></a>].&nbsp;
 If the PMSI Tunnel attribute specifies an IP</span></p>
<p class=3D"MsoNormal" style=3D"background-color: white; word-break: break-=
all;"><span style=3D"font-size: 10.5pt; font-family: &quot;Courier New&quot=
;; color: black;">&nbsp;&nbsp; tunnel, the Tunnel Encapsulation attribute c=
ould be used to provide</span></p>
<p class=3D"MsoNormal" style=3D"background-color: white; word-break: break-=
all;"><span style=3D"font-size: 10.5pt; font-family: &quot;Courier New&quot=
;; color: black;">&nbsp;&nbsp; additional information about the IP tunnel.&=
nbsp; The usage of the Tunnel</span></p>
<p class=3D"MsoNormal" style=3D"background-color: white; word-break: break-=
all;"><span style=3D"font-size: 10.5pt; font-family: &quot;Courier New&quot=
;; color: black;">&nbsp;&nbsp; Encapsulation attribute in combination with =
the PMSI Tunnel attribute</span></p>
<p class=3D"MsoNormal" style=3D"background-color: white; word-break: break-=
all;"><span style=3D"font-size: 10.5pt; font-family: &quot;Courier New&quot=
;; color: black;">&nbsp;&nbsp; is outside the scope of this document.</span=
></p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Since the text itself was unclear what additional in=
formation could be provided, the authors removed it from the draft.
</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">As we had not received any feedback about active RFC=
6514 interactions on the list.
</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">[document shepherd off]</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">If you have an implementation of the interaction bet=
ween the RF6514 and tunnel encapsulation, it would be valuable to provide:<=
/p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">a) &nbsp;either a draft specifying the interaction y=
ou wish to IDR WG, or &nbsp;</p>
<p class=3D"MsoNormal">b) &nbsp;comments that could replace the original th=
e original text.
</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Since the IDR draft has gone through multiple WG LC =
and a very complete review from Alvaro =96 so a quick response would be app=
reciated. &nbsp;&nbsp;IMHO a draft on the interaction between RFC6514 and t=
he tunnel-encapsulation draft =96 would be the best
 thing at this point.&nbsp; Let me know if you are interested in working on=
 such a draft.
</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Sue </p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"color: rgb(31, 73, 125);">&nbsp;</spa=
n></p>
<div>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt; font-family:&quo=
t;Tahoma&quot;,sans-serif">From:</span></b><span style=3D"font-size:10.0pt;=
 font-family:&quot;Tahoma&quot;,sans-serif"> Ali Sajassi (sajassi) [mailto:=
sajassi@cisco.com]
<br>
<b>Sent:</b> Friday, July 31, 2020 1:54 AM<br>
<b>To:</b> Susan Hares; bess@ietf.org; idr@ietf.org<br>
<b>Cc:</b> 'Hu, Jun (Nokia - US/Mountain View)'<br>
<b>Subject:</b> Re: IPSec Tunnels and draft-sajassi-bess-secure-evpn </span=
></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">&lt;added idr@ietf.org&gt;</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Sue,</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Before getting to the discussions of the three IPsec=
 proposals, there are some elements of draft-ietf-idr-tunnel-encaps-17.txt =
that I can see might have caused some confusions and I=92d like to get thos=
e sorted out first.
</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">The tunnel-encap draft specifies sub-tlv for VxLAN, =
VxLAN GDP, and NVGRE in sections 3.2.1, 3.2.2, and 3.2.3. I am not aware of=
 any vendor that has implemented these sub-tlvs because the info in these s=
ub-tlv already exist in EVPN routes
 (e.g., MAC addresses, Ethernet Tags, etc.) which they have implemented it.=
 Therefore, all the vendors that I am aware of use Extended Community &nbsp=
;defined in section 4.1&nbsp; along with EVPN routes to signal VxLAN and GE=
NEVE tunnel types. Furthermore, I am not aware
 of anyone using NVGRE encap! So, as the first step, we should remove these=
 three sections from the draft if there is no objection.
</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Cheers,</p>
<p class=3D"MsoNormal">Ali</p>
<p class=3D"MsoNormal">&nbsp;</p>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size: 12pt; color: black;">Fr=
om: </span>
</b><span style=3D"font-size: 12pt; color: black;">Susan Hares &lt;shares@n=
dzh.com&gt;<br>
<b>Date: </b>Tuesday, July 28, 2020 at 8:30 AM<br>
<b>To: </b>Cisco Employee &lt;sajassi@cisco.com&gt;, &quot;bess@ietf.org&qu=
ot; &lt;bess@ietf.org&gt;<br>
<b>Cc: </b>&quot;'Hu, Jun (Nokia - US/Mountain View)'&quot; &lt;jun.hu@noki=
a.com&gt;<br>
<b>Subject: </b>IPSec Tunnels and draft-sajassi-bess-secure-evpn </span></p=
>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<p class=3D"MsoNormal">Ali and bess WG: </p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">IDR has 3 proposals for IPsec tunnels that impact dr=
aft-ietf-idr-tunnel-encaps-17.txt.&nbsp; As an IDR co-chair/shepherd, &nbsp=
;I have been discussing these three drafts (Ali and two other authors sets)=
 to try to find out if we can have one general
 solutions. &nbsp;&nbsp;</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">The discussion has been very fruitful to point up BG=
P issues of interoperability, security, privacy, manageability, and scaling=
.&nbsp; For example, there is a lack of a clear specification between RFC65=
14 (PMSI tunnel attribute) and the tunnel-encaps
 draft that specifies how these drafts interoperate. &nbsp;I suspect the be=
ss and idr chairs will need to discuss if tunnel-encaps has to address this=
 point.
</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">I wrote up my ideas in draft-hares-idr-bgp-ipsec-ana=
lysis-00.txt so the authors could tell me what I misunderstood.&nbsp; &nbsp=
;You=92ll find this draft stops half way.&nbsp; I have the rest of the draf=
t written, but I wanted feedback from all the author
 teams before sending it out. </p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">After hearing some of the details from the authors, =
I would like to sponsor an IDR interim so we could discuss these issues at =
length.&nbsp;&nbsp; If you think this is a good idea, please let me know.
</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">One other thing=85 unfortunately, I scheduled a set =
of meetings for EDT time after IETF meetings this week.&nbsp; &nbsp;Your ne=
xt response will occur from 11-16 UTC on Wednesday.
</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Cheerily, Sue </p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
</div>
</div>
</body>
</html>

--_000_MWHPR08MB35209E626BD777C81D5E8CB8F74F0MWHPR08MB3520namp_--


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To: "'Ali Sajassi \(sajassi\)'" <sajassi@cisco.com>, <bess@ietf.org>, <idr@ietf.org>
Cc: "'Hu, Jun \(Nokia - US/Mountain View\)'" <jun.hu@nokia.com>
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Subject: Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn - tunnel encapsulation draft
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Ali:=20

=20

[IDR WG chair hat on]=20

If you or anyone you know has specific information on implementations =
provide it to the wiki at

=20

https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%20implem=
entations

=20

The IDR group welcomes specific implementation reports.  Please note the =
implementation form requires the submitter to provide their name and =
links to appropriate documentation.   =20

=20

The WG process has run for a long time on this draft (over a year) and =
you have not commented on the draft.   Unless we have specific =
implementation information on EVPN in implementations and RFC 8365, it =
is difficult to ask the authors to re-open the process. =20

[IDR Chair hat off]

=20

[Shepherd hat on]=20

=20

I=E2=80=99ll await the authors to respond to your comment about:

=20

1) the sub-bullet text adding to  -17.txt,=20

2) your comment on RFC 8365

3) the removed paragraph.

=20

It is inappropriate as a shepherd to speak for the authors until they do =
the first review.=20

[shepherd hat off]=20

=20

Thank you for bringing up potential issues with the =
draft-ietf-tunnel-encapsulation-17.txt.  =20

=20

Cheerily, Susan Hares=20

=20

=20

=20

From: Ali Sajassi (sajassi) [mailto:sajassi@cisco.com]=20
Sent: Friday, July 31, 2020 9:18 PM
To: Susan Hares; bess@ietf.org; idr@ietf.org
Cc: 'Hu, Jun (Nokia - US/Mountain View)'
Subject: Re: IPSec Tunnels and draft-sajassi-bess-secure-evpn=20

=20

Sue,

=20

I am afraid if we don=E2=80=99t clean up the draft, it can cause =
confusion as it has already and result in immediate errata filing for it =
after publication. A sub-bullet got added to the latest rev (rev17) that =
is not correct. It says that the VxLAN sub-tlv is sent with EVPN route =
when V bit not set. However, EVPN never uses this sub-tlv as its routes =
has all the needed info. Furthermore, RFC 8365 is very clear that EVPN =
uses Tunnel Encapsulation Extended Community (per section 4.1). As I =
said, I am not aware of any of the vendors using these sub-TVLs and it =
is easy to have a quick poll.

=20

Regarding the paragraph that got omitted, it is making it much more =
ambiguous than it used to. I would opt for clarifying the paragraph =
rather than removing it. If needed I can provide an updated paragraph. =
Section 9 of RFC 8365 specifies how a VPN multicast route can be =
advertised with PMSI tunnel attribute and Encapsulation extended =
community and has been implemented by many vendors.

=20

Cheers,

Ali

=20

=20

From: Susan Hares <shares@ndzh.com>
Date: Friday, July 31, 2020 at 5:02 AM
To: Cisco Employee <sajassi@cisco.com>, "bess@ietf.org" <bess@ietf.org>, =
"idr@ietf.org" <idr@ietf.org>
Cc: "'Hu, Jun (Nokia - US/Mountain View)'" <jun.hu@nokia.com>
Subject: RE: IPSec Tunnels and draft-sajassi-bess-secure-evpn=20

=20

Ali:

=20

It is wise to start with the RFC6514 and the =
draft-ietf-idr-tunnel-encapsulation draft.  =20

=20

[WG chair hat on]=20

The tunnel-encapsulation draft has passed general WG LC =E2=80=93 so it =
is inappropriate to call for the request to remove these sections.  The =
WG LC that is currently running is whether to remove the =
=E2=80=9CAS=E2=80=9D field from the tunnel endpoint field, and replace =
it with a reserved field.=20

=20

The implementation page is on:=20

https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%20implem=
entations

=20

If you wish to provide information on the cisco implementation, you are =
welcome to add information on the page.=20

I can call for an update to the page from vendors.

=20

[WG chair hat off[

[Document shepherd hat on]=20

=20

The issue is during the edits the text from RFC6514 from Eric Rosen was =
unclear.  The text was:=20





   It has been suggested that it may sometimes be useful to attach a

   Tunnel Encapsulation attribute to a BGP UPDATE message that is also

   carrying a PMSI (Provider Multicast Service Interface) Tunnel

   attribute [ <https://datatracker.ietf.org/doc/html/rfc6514> RFC6514]. =
 If the PMSI Tunnel attribute specifies an IP

   tunnel, the Tunnel Encapsulation attribute could be used to provide

   additional information about the IP tunnel.  The usage of the Tunnel

   Encapsulation attribute in combination with the PMSI Tunnel attribute

   is outside the scope of this document.

=20

Since the text itself was unclear what additional information could be =
provided, the authors removed it from the draft.=20

=20

As we had not received any feedback about active RFC6514 interactions on =
the list.=20

=20

[document shepherd off]

=20

If you have an implementation of the interaction between the RF6514 and =
tunnel encapsulation, it would be valuable to provide:

=20

a)  either a draft specifying the interaction you wish to IDR WG, or =20

b)  comments that could replace the original the original text.=20

=20

Since the IDR draft has gone through multiple WG LC and a very complete =
review from Alvaro =E2=80=93 so a quick response would be appreciated.   =
IMHO a draft on the interaction between RFC6514 and the =
tunnel-encapsulation draft =E2=80=93 would be the best thing at this =
point.  Let me know if you are interested in working on such a draft.=20

=20

Sue=20

=20

=20

From: Ali Sajassi (sajassi) [mailto:sajassi@cisco.com]=20
Sent: Friday, July 31, 2020 1:54 AM
To: Susan Hares; bess@ietf.org; idr@ietf.org
Cc: 'Hu, Jun (Nokia - US/Mountain View)'
Subject: Re: IPSec Tunnels and draft-sajassi-bess-secure-evpn=20

=20

<added idr@ietf.org>

=20

Sue,

=20

Before getting to the discussions of the three IPsec proposals, there =
are some elements of draft-ietf-idr-tunnel-encaps-17.txt that I can see =
might have caused some confusions and I=E2=80=99d like to get those =
sorted out first.=20

=20

The tunnel-encap draft specifies sub-tlv for VxLAN, VxLAN GDP, and NVGRE =
in sections 3.2.1, 3.2.2, and 3.2.3. I am not aware of any vendor that =
has implemented these sub-tlvs because the info in these sub-tlv already =
exist in EVPN routes (e.g., MAC addresses, Ethernet Tags, etc.) which =
they have implemented it. Therefore, all the vendors that I am aware of =
use Extended Community  defined in section 4.1  along with EVPN routes =
to signal VxLAN and GENEVE tunnel types. Furthermore, I am not aware of =
anyone using NVGRE encap! So, as the first step, we should remove these =
three sections from the draft if there is no objection.=20

=20

Cheers,

Ali

=20

From: Susan Hares <shares@ndzh.com>
Date: Tuesday, July 28, 2020 at 8:30 AM
To: Cisco Employee <sajassi@cisco.com>, "bess@ietf.org" <bess@ietf.org>
Cc: "'Hu, Jun (Nokia - US/Mountain View)'" <jun.hu@nokia.com>
Subject: IPSec Tunnels and draft-sajassi-bess-secure-evpn=20

=20

Ali and bess WG:=20

=20

IDR has 3 proposals for IPsec tunnels that impact =
draft-ietf-idr-tunnel-encaps-17.txt.  As an IDR co-chair/shepherd,  I =
have been discussing these three drafts (Ali and two other authors sets) =
to try to find out if we can have one general solutions.  =20

=20

The discussion has been very fruitful to point up BGP issues of =
interoperability, security, privacy, manageability, and scaling.  For =
example, there is a lack of a clear specification between RFC6514 (PMSI =
tunnel attribute) and the tunnel-encaps draft that specifies how these =
drafts interoperate.  I suspect the bess and idr chairs will need to =
discuss if tunnel-encaps has to address this point.=20

=20

I wrote up my ideas in draft-hares-idr-bgp-ipsec-analysis-00.txt so the =
authors could tell me what I misunderstood.   You=E2=80=99ll find this =
draft stops half way.  I have the rest of the draft written, but I =
wanted feedback from all the author teams before sending it out.=20

=20

After hearing some of the details from the authors, I would like to =
sponsor an IDR interim so we could discuss these issues at length.   If =
you think this is a good idea, please let me know.=20

=20

One other thing=E2=80=A6 unfortunately, I scheduled a set of meetings =
for EDT time after IETF meetings this week.   Your next response will =
occur from 11-16 UTC on Wednesday.=20

=20

Cheerily, Sue=20

=20

=20


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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>Ali: <o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>[IDR WG chair hat on] =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>If you or anyone you know has specific =
information on implementations provide it to the wiki =
at<o:p></o:p></span></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><a =
href=3D"https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%=
20implementations">https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tun=
nel-encaps%20implementations</a><o:p></o:p></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>The IDR group welcomes =
specific implementation reports. =C2=A0Please note the implementation =
form requires the submitter to provide their name and links to =
appropriate documentation.=C2=A0 =C2=A0=C2=A0<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>The WG process has run =
for a long time on this draft (over a year) and you have not commented =
on the draft.=C2=A0 =C2=A0Unless we have specific implementation =
information on EVPN in implementations and RFC 8365, it is difficult to =
ask the authors to re-open the process.=C2=A0 <o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>[IDR Chair hat =
off]<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>[Shepherd hat on] =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>I=E2=80=99ll await the =
authors to respond to your comment about:<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>1) the sub-bullet text =
adding to =C2=A0-17.txt, <o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>2) your comment on RFC =
8365<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>3) the removed =
paragraph.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>It is inappropriate as a =
shepherd to speak for the authors until they do the first review. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>[shepherd hat off] <o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Thank you for bringing =
up potential issues with the =
draft-ietf-tunnel-encapsulation-17.txt.=C2=A0 =
=C2=A0<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Cheerily, Susan Hares =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'> =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>=C2=A0<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
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 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
Ali Sajassi (sajassi) [mailto:sajassi@cisco.com] <br><b>Sent:</b> =
Friday, July 31, 2020 9:18 PM<br><b>To:</b> Susan Hares; bess@ietf.org; =
idr@ietf.org<br><b>Cc:</b> 'Hu, Jun (Nokia - US/Mountain =
View)'<br><b>Subject:</b> Re: IPSec Tunnels and =
draft-sajassi-bess-secure-evpn <o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Sue,<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>I am afraid =
if we don=E2=80=99t clean up the draft, it can cause confusion as it has =
already and result in immediate errata filing for it after publication. =
A sub-bullet got added to the latest rev (rev17) that is not correct. It =
says that the VxLAN sub-tlv is sent with EVPN route when V bit not set. =
However, EVPN never uses this sub-tlv as its routes has all the needed =
info. Furthermore, RFC 8365 is very clear that EVPN uses Tunnel =
Encapsulation Extended Community (per section 4.1). As I said, I am not =
aware of any of the vendors using these sub-TVLs and it is easy to have =
a quick poll.<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Regarding the paragraph that got omitted, it is making =
it much more ambiguous than it used to. I would opt for clarifying the =
paragraph rather than removing it. If needed I can provide an updated =
paragraph. Section 9 of RFC 8365 specifies how a VPN multicast route can =
be advertised with PMSI tunnel attribute and Encapsulation extended =
community and has been implemented by many vendors.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Cheers,<o:p></o:p></p><p =
class=3DMsoNormal>Ali<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:12.0pt;color:black'>From: </span></b><span =
style=3D'font-size:12.0pt;color:black'>Susan Hares =
&lt;shares@ndzh.com&gt;<br><b>Date: </b>Friday, July 31, 2020 at 5:02 =
AM<br><b>To: </b>Cisco Employee &lt;sajassi@cisco.com&gt;, =
&quot;bess@ietf.org&quot; &lt;bess@ietf.org&gt;, =
&quot;idr@ietf.org&quot; &lt;idr@ietf.org&gt;<br><b>Cc: </b>&quot;'Hu, =
Jun (Nokia - US/Mountain View)'&quot; =
&lt;jun.hu@nokia.com&gt;<br><b>Subject: </b>RE: IPSec Tunnels and =
draft-sajassi-bess-secure-evpn <o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>Ali:</span><o:p></o:p></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>It is wise to start with =
the RFC6514 and the draft-ietf-idr-tunnel-encapsulation =
draft.&nbsp;&nbsp; </span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>[WG chair hat on] =
</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>The tunnel-encapsulation draft has passed =
general WG LC =E2=80=93 so it is inappropriate to call for the request =
to remove these sections.&nbsp; The WG LC that is currently running is =
whether to remove the =E2=80=9CAS=E2=80=9D field from the tunnel =
endpoint field, and replace it with a reserved field. =
</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>The implementation page =
is on: </span><o:p></o:p></p><p class=3DMsoNormal><a =
href=3D"https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%=
20implementations">https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tun=
nel-encaps%20implementations</a><o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>If you wish =
to provide information on the cisco implementation, you are welcome to =
add information on the page. <o:p></o:p></p><p class=3DMsoNormal>I can =
call for an update to the page from vendors.<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>[WG chair =
hat off[<o:p></o:p></p><p class=3DMsoNormal>[Document shepherd hat on] =
<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>The issue is during the edits the text from RFC6514 =
from Eric Rosen was unclear.&nbsp; The text was: <o:p></o:p></p><p =
class=3DMsoNormal =
style=3D'margin-bottom:12.0pt;background:white;word-break:break-all'><spa=
n style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'><br><br></span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp;&nbsp;It has been suggested that it may =
sometimes be useful to attach a</span><o:p></o:p></p><p =
class=3DMsoNormal style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; Tunnel Encapsulation attribute to a BGP =
UPDATE message that is also</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; carrying a PMSI (Provider Multicast =
Service Interface) Tunnel</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; attribute [<a =
href=3D"https://datatracker.ietf.org/doc/html/rfc6514"><span =
style=3D'color:#3D22B3'>RFC6514</span></a>].&nbsp; If the PMSI Tunnel =
attribute specifies an IP</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; tunnel, the Tunnel Encapsulation =
attribute could be used to provide</span><o:p></o:p></p><p =
class=3DMsoNormal style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; additional information about the IP =
tunnel.&nbsp; The usage of the Tunnel</span><o:p></o:p></p><p =
class=3DMsoNormal style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; Encapsulation attribute in combination =
with the PMSI Tunnel attribute</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; is outside the scope of this =
document.</span><o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>Since the =
text itself was unclear what additional information could be provided, =
the authors removed it from the draft. <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>As we had =
not received any feedback about active RFC6514 interactions on the list. =
<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>[document shepherd off]<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>If you have =
an implementation of the interaction between the RF6514 and tunnel =
encapsulation, it would be valuable to provide:<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>a) =
&nbsp;either a draft specifying the interaction you wish to IDR WG, or =
&nbsp;<o:p></o:p></p><p class=3DMsoNormal>b) &nbsp;comments that could =
replace the original the original text. <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>Since the =
IDR draft has gone through multiple WG LC and a very complete review =
from Alvaro =E2=80=93 so a quick response would be appreciated. =
&nbsp;&nbsp;IMHO a draft on the interaction between RFC6514 and the =
tunnel-encapsulation draft =E2=80=93 would be the best thing at this =
point.&nbsp; Let me know if you are interested in working on such a =
draft. <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>Sue <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>&nbsp;</span><o:p></o:p></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
Ali Sajassi (sajassi) [mailto:sajassi@cisco.com] <br><b>Sent:</b> =
Friday, July 31, 2020 1:54 AM<br><b>To:</b> Susan Hares; bess@ietf.org; =
idr@ietf.org<br><b>Cc:</b> 'Hu, Jun (Nokia - US/Mountain =
View)'<br><b>Subject:</b> Re: IPSec Tunnels and =
draft-sajassi-bess-secure-evpn </span><o:p></o:p></p></div></div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&lt;added =
idr@ietf.org&gt;<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>Sue,<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>Before =
getting to the discussions of the three IPsec proposals, there are some =
elements of draft-ietf-idr-tunnel-encaps-17.txt that I can see might =
have caused some confusions and I=E2=80=99d like to get those sorted out =
first. <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>The tunnel-encap draft specifies sub-tlv for VxLAN, =
VxLAN GDP, and NVGRE in sections 3.2.1, 3.2.2, and 3.2.3. I am not aware =
of any vendor that has implemented these sub-tlvs because the info in =
these sub-tlv already exist in EVPN routes (e.g., MAC addresses, =
Ethernet Tags, etc.) which they have implemented it. Therefore, all the =
vendors that I am aware of use Extended Community &nbsp;defined in =
section 4.1&nbsp; along with EVPN routes to signal VxLAN and GENEVE =
tunnel types. Furthermore, I am not aware of anyone using NVGRE encap! =
So, as the first step, we should remove these three sections from the =
draft if there is no objection. <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>Cheers,<o:p></o:p></p><p =
class=3DMsoNormal>Ali<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:12.0pt;color:black'>From: </span></b><span =
style=3D'font-size:12.0pt;color:black'>Susan Hares =
&lt;shares@ndzh.com&gt;<br><b>Date: </b>Tuesday, July 28, 2020 at 8:30 =
AM<br><b>To: </b>Cisco Employee &lt;sajassi@cisco.com&gt;, =
&quot;bess@ietf.org&quot; &lt;bess@ietf.org&gt;<br><b>Cc: </b>&quot;'Hu, =
Jun (Nokia - US/Mountain View)'&quot; =
&lt;jun.hu@nokia.com&gt;<br><b>Subject: </b>IPSec Tunnels and =
draft-sajassi-bess-secure-evpn </span><o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><p class=3DMsoNormal>Ali =
and bess WG: <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>IDR has 3 proposals for IPsec tunnels that impact =
draft-ietf-idr-tunnel-encaps-17.txt.&nbsp; As an IDR co-chair/shepherd, =
&nbsp;I have been discussing these three drafts (Ali and two other =
authors sets) to try to find out if we can have one general solutions. =
&nbsp;&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>The discussion has been very fruitful to point up BGP =
issues of interoperability, security, privacy, manageability, and =
scaling.&nbsp; For example, there is a lack of a clear specification =
between RFC6514 (PMSI tunnel attribute) and the tunnel-encaps draft that =
specifies how these drafts interoperate. &nbsp;I suspect the bess and =
idr chairs will need to discuss if tunnel-encaps has to address this =
point. <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>I wrote up my ideas in =
draft-hares-idr-bgp-ipsec-analysis-00.txt so the authors could tell me =
what I misunderstood.&nbsp; &nbsp;You=E2=80=99ll find this draft stops =
half way.&nbsp; I have the rest of the draft written, but I wanted =
feedback from all the author teams before sending it out. =
<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>After hearing some of the details from the authors, I =
would like to sponsor an IDR interim so we could discuss these issues at =
length.&nbsp;&nbsp; If you think this is a good idea, please let me =
know. <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>One other thing=E2=80=A6 unfortunately, I scheduled a =
set of meetings for EDT time after IETF meetings this week.&nbsp; =
&nbsp;Your next response will occur from 11-16 UTC on Wednesday. =
<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>Cheerily, Sue <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
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From: "Susan Hares" <shares@ndzh.com>
To: "'Rabadan, Jorge \(Nokia - US/Mountain View\)'" <jorge.rabadan@nokia.com>,  "'Ali Sajassi \(sajassi\)'" <sajassi=40cisco.com@dmarc.ietf.org>, <bess@ietf.org>, <idr@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/wKGUNDWwWY_drnNaBOFGswRDftA>
Subject: Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn
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Rabadan: 

 

Thank you for your input.   Please review the details of the message I sent
to Ali. 

 

Synopsis: 

[IDR Chair hat]  We welcome implementation reports at: 

https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%20implement
ations

 

It's hard to ask authors to re-open old issues unless you have specific
implementation issues

substantiated on the wiki with an implementation report.   

You can put a comment at the bottom if you are unclear about the format. 

The person who puts the information must provide a name and an email
address.  

[IDR Chair hat off]

[Shepherd hat on] I will await the authors response to your queries on EVPN.
[Shepherd hat off] 

 

Thank you for bring up the EVPN related issues.  

 

Cheerily, Susan Hares 

 

 

From: BESS [mailto:bess-bounces@ietf.org] On Behalf Of Rabadan, Jorge (Nokia
- US/Mountain View)
Sent: Saturday, August 1, 2020 4:30 AM
To: Ali Sajassi (sajassi); Susan Hares; bess@ietf.org; idr@ietf.org
Cc: Hu, Jun (Nokia - US/Mountain View)
Subject: Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn

 

I fully agree with Ali.

I think the VXLAN TLV only makes sense for other families, and not for EVPN.
We've done EVPN public interoperability for a few years and everyone uses
the BGP encap extends community.

 

Thanks,

Jorge 

 

  _____  

From: BESS <bess-bounces@ietf.org> on behalf of Ali Sajassi (sajassi)
<sajassi=40cisco.com@dmarc.ietf.org>
Sent: Saturday, August 1, 2020 03:18
To: Susan Hares; bess@ietf.org; idr@ietf.org
Cc: Hu, Jun (Nokia - US/Mountain View)
Subject: Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn 

 

Sue,

 

I am afraid if we don't clean up the draft, it can cause confusion as it has
already and result in immediate errata filing for it after publication. A
sub-bullet got added to the latest rev (rev17) that is not correct. It says
that the VxLAN sub-tlv is sent with EVPN route when V bit not set. However,
EVPN never uses this sub-tlv as its routes has all the needed info.
Furthermore, RFC 8365 is very clear that EVPN uses Tunnel Encapsulation
Extended Community (per section 4.1). As I said, I am not aware of any of
the vendors using these sub-TVLs and it is easy to have a quick poll.

 

Regarding the paragraph that got omitted, it is making it much more
ambiguous than it used to. I would opt for clarifying the paragraph rather
than removing it. If needed I can provide an updated paragraph. Section 9 of
RFC 8365 specifies how a VPN multicast route can be advertised with PMSI
tunnel attribute and Encapsulation extended community and has been
implemented by many vendors.

 

Cheers,

Ali

 

 

From: Susan Hares <shares@ndzh.com>
Date: Friday, July 31, 2020 at 5:02 AM
To: Cisco Employee <sajassi@cisco.com>, "bess@ietf.org" <bess@ietf.org>,
"idr@ietf.org" <idr@ietf.org>
Cc: "'Hu, Jun (Nokia - US/Mountain View)'" <jun.hu@nokia.com>
Subject: RE: IPSec Tunnels and draft-sajassi-bess-secure-evpn 

 

Ali:

 

It is wise to start with the RFC6514 and the
draft-ietf-idr-tunnel-encapsulation draft..   

 

[WG chair hat on] 

The tunnel-encapsulation draft has passed general WG LC - so it is
inappropriate to call for the request to remove these sections.  The WG LC
that is currently running is whether to remove the "AS" field from the
tunnel endpoint field, and replace it with a reserved field.. 

 

The implementation page is on: 

https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%20implement
ations

 

If you wish to provide information on the cisco implementation, you are
welcome to add information on the page. 

I can call for an update to the page from vendors.

 

[WG chair hat off[

[Document shepherd hat on] 

 

The issue is during the edits the text from RFC6514 from Eric Rosen was
unclear.  The text was: 





   It has been suggested that it may sometimes be useful to attach a

   Tunnel Encapsulation attribute to a BGP UPDATE message that is also

   carrying a PMSI (Provider Multicast Service Interface) Tunnel

   attribute [ <https://datatracker.ietf.org/doc/html/rfc6514> RFC6514].  If
the PMSI Tunnel attribute specifies an IP

   tunnel, the Tunnel Encapsulation attribute could be used to provide

   additional information about the IP tunnel.  The usage of the Tunnel

   Encapsulation attribute in combination with the PMSI Tunnel attribute

   is outside the scope of this document.

 

Since the text itself was unclear what additional information could be
provided, the authors removed it from the draft. 

 

As we had not received any feedback about active RFC6514 interactions on the
list. 

 

[document shepherd off]

 

If you have an implementation of the interaction between the RF6514 and
tunnel encapsulation, it would be valuable to provide:

 

a)  either a draft specifying the interaction you wish to IDR WG, or  

b)  comments that could replace the original the original text. 

 

Since the IDR draft has gone through multiple WG LC and a very complete
review from Alvaro - so a quick response would be appreciated.   IMHO a
draft on the interaction between RFC6514 and the tunnel-encapsulation draft
- would be the best thing at this point.  Let me know if you are interested
in working on such a draft. 

 

Sue 

 

 

From: Ali Sajassi (sajassi) [mailto:sajassi@cisco.com] 
Sent: Friday, July 31, 2020 1:54 AM
To: Susan Hares; bess@ietf.org; idr@ietf.org
Cc: 'Hu, Jun (Nokia - US/Mountain View)'
Subject: Re: IPSec Tunnels and draft-sajassi-bess-secure-evpn 

 

<added idr@ietf.org>

 

Sue,

 

Before getting to the discussions of the three IPsec proposals, there are
some elements of draft-ietf-idr-tunnel-encaps-17.txt that I can see might
have caused some confusions and I'd like to get those sorted out first. 

 

The tunnel-encap draft specifies sub-tlv for VxLAN, VxLAN GDP, and NVGRE in
sections 3.2.1, 3.2.2, and 3.2.3. I am not aware of any vendor that has
implemented these sub-tlvs because the info in these sub-tlv already exist
in EVPN routes (e.g., MAC addresses, Ethernet Tags, etc.) which they have
implemented it. Therefore, all the vendors that I am aware of use Extended
Community  defined in section 4.1  along with EVPN routes to signal VxLAN
and GENEVE tunnel types. Furthermore, I am not aware of anyone using NVGRE
encap! So, as the first step, we should remove these three sections from the
draft if there is no objection. 

 

Cheers,

Ali

 

From: Susan Hares <shares@ndzh.com>
Date: Tuesday, July 28, 2020 at 8:30 AM
To: Cisco Employee <sajassi@cisco.com>, "bess@ietf.org" <bess@ietf.org>
Cc: "'Hu, Jun (Nokia - US/Mountain View)'" <jun.hu@nokia.com>
Subject: IPSec Tunnels and draft-sajassi-bess-secure-evpn 

 

Ali and bess WG: 

 

IDR has 3 proposals for IPsec tunnels that impact
draft-ietf-idr-tunnel-encaps-17.txt.  As an IDR co-chair/shepherd,  I have
been discussing these three drafts (Ali and two other authors sets) to try
to find out if we can have one general solutions.   

 

The discussion has been very fruitful to point up BGP issues of
interoperability, security, privacy, manageability, and scaling..  For
example, there is a lack of a clear specification between RFC6514 (PMSI
tunnel attribute) and the tunnel-encaps draft that specifies how these
drafts interoperate.  I suspect the bess and idr chairs will need to discuss
if tunnel-encaps has to address this point. 

 

I wrote up my ideas in draft-hares-idr-bgp-ipsec-analysis-00.txt so the
authors could tell me what I misunderstood.   You'll find this draft stops
half way.  I have the rest of the draft written, but I wanted feedback from
all the author teams before sending it out. 

 

After hearing some of the details from the authors, I would like to sponsor
an IDR interim so we could discuss these issues at length.   If you think
this is a good idea, please let me know. 

 

One other thing. unfortunately, I scheduled a set of meetings for EDT time
after IETF meetings this week.   Your next response will occur from 11-16
UTC on Wednesday. 

 

Cheerily, Sue 

 

 


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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>Rabadan: <o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Thank you for your =
input.&nbsp;&nbsp; Please review the details of the message I sent to =
Ali. <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Synopsis: =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>[IDR Chair hat]&nbsp; We welcome implementation =
reports at: <o:p></o:p></span></p><p class=3DMsoNormal><a =
href=3D"https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%=
20implementations">https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tun=
nel-encaps%20implementations</a><o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>It&#8217;s =
hard to ask authors to re-open old issues unless you have specific =
implementation issues<o:p></o:p></p><p class=3DMsoNormal> substantiated =
on the wiki with an implementation report.&nbsp;&nbsp; <o:p></o:p></p><p =
class=3DMsoNormal>You can put a comment at the bottom if you are unclear =
about the format. <o:p></o:p></p><p class=3DMsoNormal>The person who =
puts the information must provide a name and an email address. =
&nbsp;<o:p></o:p></p><p class=3DMsoNormal>[IDR Chair hat =
off]<o:p></o:p></p><p class=3DMsoNormal>[Shepherd hat on] I will await =
the authors response to your queries on EVPN. &nbsp;[Shepherd hat off] =
<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Thank you for bring up the EVPN related issues.&nbsp; =
<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Cheerily, Susan Hares <o:p></o:p></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
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 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
BESS [mailto:bess-bounces@ietf.org] <b>On Behalf Of </b>Rabadan, Jorge =
(Nokia - US/Mountain View)<br><b>Sent:</b> Saturday, August 1, 2020 4:30 =
AM<br><b>To:</b> Ali Sajassi (sajassi); Susan Hares; bess@ietf.org; =
idr@ietf.org<br><b>Cc:</b> Hu, Jun (Nokia - US/Mountain =
View)<br><b>Subject:</b> Re: [bess] IPSec Tunnels and =
draft-sajassi-bess-secure-evpn<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><div><p =
class=3DMsoNormal>I fully agree with Ali.<o:p></o:p></p></div><div><p =
class=3DMsoNormal>I think the VXLAN TLV only makes sense for other =
families, and not for EVPN. We&#8217;ve done EVPN public =
interoperability for a few years and everyone uses the BGP encap extends =
community.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Thanks,<o:p></o:p></p></div><div><p =
class=3DMsoNormal>Jorge&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div></div><div =
id=3Did-b6accf00-1e63-490b-9e0c-ed4bfc7d1250><div class=3DMsoNormal =
align=3Dcenter style=3D'text-align:center'><hr size=3D2 width=3D"98%" =
noshade style=3D'color:black' align=3Dcenter></div><div =
id=3DdivRplyFwdMsg><p class=3DMsoNormal><b>From:</b> BESS =
&lt;bess-bounces@ietf.org&gt; on behalf of Ali Sajassi (sajassi) =
&lt;sajassi=3D40cisco.com@dmarc.ietf.org&gt;<br><b>Sent:</b> Saturday, =
August 1, 2020 03:18<br><b>To:</b> Susan Hares; bess@ietf.org; =
idr@ietf.org<br><b>Cc:</b> Hu, Jun (Nokia - US/Mountain =
View)<br><b>Subject:</b> Re: [bess] IPSec Tunnels and =
draft-sajassi-bess-secure-evpn <o:p></o:p></p><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><p =
class=3DMsoNormal>Sue,<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>I am afraid =
if we don&#8217;t clean up the draft, it can cause confusion as it has =
already and result in immediate errata filing for it after publication. =
A sub-bullet got added to the latest rev (rev17) that is not correct. It =
says that the VxLAN sub-tlv is sent with EVPN route when V bit not set. =
However, EVPN never uses this sub-tlv as its routes has all the needed =
info. Furthermore, RFC 8365 is very clear that EVPN uses Tunnel =
Encapsulation Extended Community (per section 4.1). As I said, I am not =
aware of any of the vendors using these sub-TVLs and it is easy to have =
a quick poll.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>Regarding the paragraph that got omitted, it is making =
it much more ambiguous than it used to. I would opt for clarifying the =
paragraph rather than removing it. If needed I can provide an updated =
paragraph. Section 9 of RFC 8365 specifies how a VPN multicast route can =
be advertised with PMSI tunnel attribute and Encapsulation extended =
community and has been implemented by many vendors.<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>Cheers,<o:p></o:p></p><p =
class=3DMsoNormal>Ali<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:12.0pt;color:black'>From: </span></b><span =
style=3D'font-size:12.0pt;color:black'>Susan Hares =
&lt;shares@ndzh.com&gt;<br><b>Date: </b>Friday, July 31, 2020 at 5:02 =
AM<br><b>To: </b>Cisco Employee &lt;sajassi@cisco.com&gt;, =
&quot;bess@ietf.org&quot; &lt;bess@ietf.org&gt;, =
&quot;idr@ietf.org&quot; &lt;idr@ietf.org&gt;<br><b>Cc: </b>&quot;'Hu, =
Jun (Nokia - US/Mountain View)'&quot; =
&lt;jun.hu@nokia.com&gt;<br><b>Subject: </b>RE: IPSec Tunnels and =
draft-sajassi-bess-secure-evpn </span><o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>Ali:</span><o:p></o:p></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>It is wise to start with =
the RFC6514 and the draft-ietf-idr-tunnel-encapsulation =
draft..&nbsp;&nbsp; </span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>[WG chair hat on] =
</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>The tunnel-encapsulation draft has passed =
general WG LC &#8211; so it is inappropriate to call for the request to =
remove these sections.&nbsp; The WG LC that is currently running is =
whether to remove the &#8220;AS&#8221; field from the tunnel endpoint =
field, and replace it with a reserved field.. </span><o:p></o:p></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>The implementation page =
is on: </span><o:p></o:p></p><p class=3DMsoNormal><a =
href=3D"https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%=
20implementations">https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tun=
nel-encaps%20implementations</a><o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>If you wish =
to provide information on the cisco implementation, you are welcome to =
add information on the page. <o:p></o:p></p><p class=3DMsoNormal>I can =
call for an update to the page from vendors.<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>[WG chair =
hat off[<o:p></o:p></p><p class=3DMsoNormal>[Document shepherd hat on] =
<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>The issue is during the edits the text from RFC6514 =
from Eric Rosen was unclear.&nbsp; The text was: <o:p></o:p></p><p =
class=3DMsoNormal =
style=3D'margin-bottom:12.0pt;background:white;word-break:break-all'><spa=
n style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'><br><br></span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp;&nbsp;It has been suggested that it may =
sometimes be useful to attach a</span><o:p></o:p></p><p =
class=3DMsoNormal style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; Tunnel Encapsulation attribute to a BGP =
UPDATE message that is also</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; carrying a PMSI (Provider Multicast =
Service Interface) Tunnel</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; attribute [<a =
href=3D"https://datatracker.ietf.org/doc/html/rfc6514"><span =
style=3D'color:#3D22B3'>RFC6514</span></a>].&nbsp; If the PMSI Tunnel =
attribute specifies an IP</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; tunnel, the Tunnel Encapsulation =
attribute could be used to provide</span><o:p></o:p></p><p =
class=3DMsoNormal style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; additional information about the IP =
tunnel.&nbsp; The usage of the Tunnel</span><o:p></o:p></p><p =
class=3DMsoNormal style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; Encapsulation attribute in combination =
with the PMSI Tunnel attribute</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; is outside the scope of this =
document.</span><o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>Since the =
text itself was unclear what additional information could be provided, =
the authors removed it from the draft. <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>As we had =
not received any feedback about active RFC6514 interactions on the list. =
<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>[document shepherd off]<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>If you have =
an implementation of the interaction between the RF6514 and tunnel =
encapsulation, it would be valuable to provide:<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>a) =
&nbsp;either a draft specifying the interaction you wish to IDR WG, or =
&nbsp;<o:p></o:p></p><p class=3DMsoNormal>b) &nbsp;comments that could =
replace the original the original text. <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>Since the =
IDR draft has gone through multiple WG LC and a very complete review =
from Alvaro &#8211; so a quick response would be appreciated. =
&nbsp;&nbsp;IMHO a draft on the interaction between RFC6514 and the =
tunnel-encapsulation draft &#8211; would be the best thing at this =
point.&nbsp; Let me know if you are interested in working on such a =
draft. <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>Sue <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>&nbsp;</span><o:p></o:p></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
Ali Sajassi (sajassi) [mailto:sajassi@cisco.com] <br><b>Sent:</b> =
Friday, July 31, 2020 1:54 AM<br><b>To:</b> Susan Hares; bess@ietf.org; =
idr@ietf.org<br><b>Cc:</b> 'Hu, Jun (Nokia - US/Mountain =
View)'<br><b>Subject:</b> Re: IPSec Tunnels and =
draft-sajassi-bess-secure-evpn </span><o:p></o:p></p></div></div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&lt;added =
idr@ietf.org&gt;<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>Sue,<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>Before =
getting to the discussions of the three IPsec proposals, there are some =
elements of draft-ietf-idr-tunnel-encaps-17.txt that I can see might =
have caused some confusions and I&#8217;d like to get those sorted out =
first. <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>The tunnel-encap draft specifies sub-tlv for VxLAN, =
VxLAN GDP, and NVGRE in sections 3.2.1, 3.2.2, and 3.2.3. I am not aware =
of any vendor that has implemented these sub-tlvs because the info in =
these sub-tlv already exist in EVPN routes (e.g., MAC addresses, =
Ethernet Tags, etc.) which they have implemented it. Therefore, all the =
vendors that I am aware of use Extended Community &nbsp;defined in =
section 4.1&nbsp; along with EVPN routes to signal VxLAN and GENEVE =
tunnel types. Furthermore, I am not aware of anyone using NVGRE encap! =
So, as the first step, we should remove these three sections from the =
draft if there is no objection. <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>Cheers,<o:p></o:p></p><p =
class=3DMsoNormal>Ali<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:12.0pt;color:black'>From: </span></b><span =
style=3D'font-size:12.0pt;color:black'>Susan Hares =
&lt;shares@ndzh.com&gt;<br><b>Date: </b>Tuesday, July 28, 2020 at 8:30 =
AM<br><b>To: </b>Cisco Employee &lt;sajassi@cisco.com&gt;, =
&quot;bess@ietf.org&quot; &lt;bess@ietf.org&gt;<br><b>Cc: </b>&quot;'Hu, =
Jun (Nokia - US/Mountain View)'&quot; =
&lt;jun.hu@nokia.com&gt;<br><b>Subject: </b>IPSec Tunnels and =
draft-sajassi-bess-secure-evpn </span><o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><p class=3DMsoNormal>Ali =
and bess WG: <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>IDR has 3 proposals for IPsec tunnels that impact =
draft-ietf-idr-tunnel-encaps-17.txt.&nbsp; As an IDR co-chair/shepherd, =
&nbsp;I have been discussing these three drafts (Ali and two other =
authors sets) to try to find out if we can have one general solutions. =
&nbsp;&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>The discussion has been very fruitful to point up BGP =
issues of interoperability, security, privacy, manageability, and =
scaling..&nbsp; For example, there is a lack of a clear specification =
between RFC6514 (PMSI tunnel attribute) and the tunnel-encaps draft that =
specifies how these drafts interoperate. &nbsp;I suspect the bess and =
idr chairs will need to discuss if tunnel-encaps has to address this =
point. <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>I wrote up my ideas in =
draft-hares-idr-bgp-ipsec-analysis-00.txt so the authors could tell me =
what I misunderstood.&nbsp; &nbsp;You&#8217;ll find this draft stops =
half way.&nbsp; I have the rest of the draft written, but I wanted =
feedback from all the author teams before sending it out. =
<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>After hearing some of the details from the authors, I =
would like to sponsor an IDR interim so we could discuss these issues at =
length.&nbsp;&nbsp; If you think this is a good idea, please let me =
know. <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>One other thing&#8230; unfortunately, I scheduled a =
set of meetings for EDT time after IETF meetings this week.&nbsp; =
&nbsp;Your next response will occur from 11-16 UTC on Wednesday. =
<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>Cheerily, Sue <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div></div></div></body></h=
tml>
------=_NextPart_000_00DA_01D667D6.DCF11E20--


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From: John E Drake <jdrake@juniper.net>
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>, "Ali Sajassi (sajassi)" <sajassi=40cisco.com@dmarc.ietf.org>, Susan Hares <shares@ndzh.com>, "bess@ietf.org" <bess@ietf.org>, "idr@ietf.org" <idr@ietf.org>
CC: "Hu, Jun (Nokia - US/Mountain View)" <jun.hu@nokia.com>
Thread-Topic: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn
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Date: Sun, 2 Aug 2020 15:36:57 +0000
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References: <007f01d664f3$e2b14ff0$a813efd0$@ndzh.com> <8A0EAEEB-52CA-48CB-BA5E-C64DFED1EEEF@cisco.com> <00ff01d66732$61fc9fe0$25f5dfa0$@ndzh.com>, <81323BB6-3CB2-4D95-BAAE-12B798267FB8@cisco.com> <MWHPR08MB35209E626BD777C81D5E8CB8F74F0@MWHPR08MB3520.namprd08.prod.outlook.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/sHIw519ylADL4TPSRLRfl2rxt3c>
Subject: Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn
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Hi,

I also agree with Ali.  Eric specifically included the Tunnel Encapsulation=
 Extended Community in his draft at our request in order to support RFC 836=
5.  I.e., the draft that became RFC 8365 initially used the Tunnel Encapsul=
ation Extended Community defined in RFC 5512 and pre-dated by several years=
 the initial version of Eric's draft, which did not have the Tunnel Encapsu=
lation Extended Community.

Yours Irrespectively,

John



Juniper Business Use Only
From: BESS <bess-bounces@ietf.org> On Behalf Of Rabadan, Jorge (Nokia - US/=
Mountain View)
Sent: Saturday, August 1, 2020 4:30 AM
To: Ali Sajassi (sajassi) <sajassi=3D40cisco.com@dmarc.ietf.org>; Susan Har=
es <shares@ndzh.com>; bess@ietf.org; idr@ietf.org
Cc: Hu, Jun (Nokia - US/Mountain View) <jun.hu@nokia.com>
Subject: Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn

[External Email. Be cautious of content]

I fully agree with Ali.
I think the VXLAN TLV only makes sense for other families, and not for EVPN=
. We've done EVPN public interoperability for a few years and everyone uses=
 the BGP encap extends community.

Thanks,
Jorge

________________________________
From: BESS <bess-bounces@ietf.org<mailto:bess-bounces@ietf.org>> on behalf =
of Ali Sajassi (sajassi) <sajassi=3D40cisco.com@dmarc.ietf.org<mailto:sajas=
si=3D40cisco.com@dmarc.ietf.org>>
Sent: Saturday, August 1, 2020 03:18
To: Susan Hares; bess@ietf.org<mailto:bess@ietf.org>; idr@ietf.org<mailto:i=
dr@ietf.org>
Cc: Hu, Jun (Nokia - US/Mountain View)
Subject: Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn

Sue,

I am afraid if we don't clean up the draft, it can cause confusion as it ha=
s already and result in immediate errata filing for it after publication. A=
 sub-bullet got added to the latest rev (rev17) that is not correct. It say=
s that the VxLAN sub-tlv is sent with EVPN route when V bit not set. Howeve=
r, EVPN never uses this sub-tlv as its routes has all the needed info. Furt=
hermore, RFC 8365 is very clear that EVPN uses Tunnel Encapsulation Extende=
d Community (per section 4.1). As I said, I am not aware of any of the vend=
ors using these sub-TVLs and it is easy to have a quick poll.

Regarding the paragraph that got omitted, it is making it much more ambiguo=
us than it used to. I would opt for clarifying the paragraph rather than re=
moving it. If needed I can provide an updated paragraph. Section 9 of RFC 8=
365 specifies how a VPN multicast route can be advertised with PMSI tunnel =
attribute and Encapsulation extended community and has been implemented by =
many vendors.

Cheers,
Ali


From: Susan Hares <shares@ndzh.com<mailto:shares@ndzh.com>>
Date: Friday, July 31, 2020 at 5:02 AM
To: Cisco Employee <sajassi@cisco.com<mailto:sajassi@cisco.com>>, "bess@iet=
f.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:bess@ietf.org>>, "idr@ie=
tf.org<mailto:idr@ietf.org>" <idr@ietf.org<mailto:idr@ietf.org>>
Cc: "'Hu, Jun (Nokia - US/Mountain View)'" <jun.hu@nokia.com<mailto:jun.hu@=
nokia.com>>
Subject: RE: IPSec Tunnels and draft-sajassi-bess-secure-evpn

Ali:

It is wise to start with the RFC6514 and the draft-ietf-idr-tunnel-encapsul=
ation draft..

[WG chair hat on]
The tunnel-encapsulation draft has passed general WG LC - so it is inapprop=
riate to call for the request to remove these sections.  The WG LC that is =
currently running is whether to remove the "AS" field from the tunnel endpo=
int field, and replace it with a reserved field..

The implementation page is on:
https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%20implemen=
tations<https://urldefense.com/v3/__https:/trac.ietf.org/trac/idr/wiki/draf=
t-ietf-idr-tunnel-encaps*20implementations__;JQ!!NEt6yMaO-gk!W5VnNHyc3oP29X=
0LQ_irbSTb8nBnntL-309BArYBPAtGu2up9mlhbj7kYmr1rr8$>

If you wish to provide information on the cisco implementation, you are wel=
come to add information on the page.
I can call for an update to the page from vendors.

[WG chair hat off[
[Document shepherd hat on]

The issue is during the edits the text from RFC6514 from Eric Rosen was unc=
lear.  The text was:

   It has been suggested that it may sometimes be useful to attach a
   Tunnel Encapsulation attribute to a BGP UPDATE message that is also
   carrying a PMSI (Provider Multicast Service Interface) Tunnel
   attribute [RFC6514<https://urldefense.com/v3/__https:/datatracker.ietf.o=
rg/doc/html/rfc6514__;!!NEt6yMaO-gk!W5VnNHyc3oP29X0LQ_irbSTb8nBnntL-309BArY=
BPAtGu2up9mlhbj7kV1TIiiU$>].  If the PMSI Tunnel attribute specifies an IP
   tunnel, the Tunnel Encapsulation attribute could be used to provide
   additional information about the IP tunnel.  The usage of the Tunnel
   Encapsulation attribute in combination with the PMSI Tunnel attribute
   is outside the scope of this document.

Since the text itself was unclear what additional information could be prov=
ided, the authors removed it from the draft.

As we had not received any feedback about active RFC6514 interactions on th=
e list.

[document shepherd off]

If you have an implementation of the interaction between the RF6514 and tun=
nel encapsulation, it would be valuable to provide:

a)  either a draft specifying the interaction you wish to IDR WG, or
b)  comments that could replace the original the original text.

Since the IDR draft has gone through multiple WG LC and a very complete rev=
iew from Alvaro - so a quick response would be appreciated.   IMHO a draft =
on the interaction between RFC6514 and the tunnel-encapsulation draft - wou=
ld be the best thing at this point.  Let me know if you are interested in w=
orking on such a draft.

Sue


From: Ali Sajassi (sajassi) [mailto:sajassi@cisco.com]
Sent: Friday, July 31, 2020 1:54 AM
To: Susan Hares; bess@ietf.org<mailto:bess@ietf.org>; idr@ietf.org<mailto:i=
dr@ietf.org>
Cc: 'Hu, Jun (Nokia - US/Mountain View)'
Subject: Re: IPSec Tunnels and draft-sajassi-bess-secure-evpn

<added idr@ietf.org<mailto:idr@ietf.org>>

Sue,

Before getting to the discussions of the three IPsec proposals, there are s=
ome elements of draft-ietf-idr-tunnel-encaps-17.txt that I can see might ha=
ve caused some confusions and I'd like to get those sorted out first.

The tunnel-encap draft specifies sub-tlv for VxLAN, VxLAN GDP, and NVGRE in=
 sections 3.2.1, 3.2.2, and 3.2.3. I am not aware of any vendor that has im=
plemented these sub-tlvs because the info in these sub-tlv already exist in=
 EVPN routes (e.g., MAC addresses, Ethernet Tags, etc.) which they have imp=
lemented it. Therefore, all the vendors that I am aware of use Extended Com=
munity  defined in section 4.1  along with EVPN routes to signal VxLAN and =
GENEVE tunnel types. Furthermore, I am not aware of anyone using NVGRE enca=
p! So, as the first step, we should remove these three sections from the dr=
aft if there is no objection.

Cheers,
Ali

From: Susan Hares <shares@ndzh.com<mailto:shares@ndzh.com>>
Date: Tuesday, July 28, 2020 at 8:30 AM
To: Cisco Employee <sajassi@cisco.com<mailto:sajassi@cisco.com>>, "bess@iet=
f.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:bess@ietf.org>>
Cc: "'Hu, Jun (Nokia - US/Mountain View)'" <jun.hu@nokia.com<mailto:jun.hu@=
nokia.com>>
Subject: IPSec Tunnels and draft-sajassi-bess-secure-evpn

Ali and bess WG:

IDR has 3 proposals for IPsec tunnels that impact draft-ietf-idr-tunnel-enc=
aps-17.txt.  As an IDR co-chair/shepherd,  I have been discussing these thr=
ee drafts (Ali and two other authors sets) to try to find out if we can hav=
e one general solutions.

The discussion has been very fruitful to point up BGP issues of interoperab=
ility, security, privacy, manageability, and scaling..  For example, there =
is a lack of a clear specification between RFC6514 (PMSI tunnel attribute) =
and the tunnel-encaps draft that specifies how these drafts interoperate.  =
I suspect the bess and idr chairs will need to discuss if tunnel-encaps has=
 to address this point.

I wrote up my ideas in draft-hares-idr-bgp-ipsec-analysis-00.txt so the aut=
hors could tell me what I misunderstood.   You'll find this draft stops hal=
f way.  I have the rest of the draft written, but I wanted feedback from al=
l the author teams before sending it out.

After hearing some of the details from the authors, I would like to sponsor=
 an IDR interim so we could discuss these issues at length.   If you think =
this is a good idea, please let me know.

One other thing... unfortunately, I scheduled a set of meetings for EDT tim=
e after IETF meetings this week.   Your next response will occur from 11-16=
 UTC on Wednesday.

Cheerily, Sue



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<p class=3D"MsoNormal">Hi,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I also agree with Ali.&nbsp; Eric specifically inclu=
ded the Tunnel Encapsulation Extended Community in his draft at our request=
 in order to support RFC 8365.&nbsp; I.e., the draft that became RFC 8365 i=
nitially used the Tunnel Encapsulation Extended
 Community defined in RFC 5512 and pre-dated by several years the initial v=
ersion of Eric&#8217;s draft, which did not have the Tunnel Encapsulation E=
xtended Community.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">Yours Irrespectively,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">John<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;margin=
-bottom:.0001pt;text-align:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> BESS &lt;bess-bounces@ietf.org&gt; <b>O=
n Behalf Of </b>
Rabadan, Jorge (Nokia - US/Mountain View)<br>
<b>Sent:</b> Saturday, August 1, 2020 4:30 AM<br>
<b>To:</b> Ali Sajassi (sajassi) &lt;sajassi=3D40cisco.com@dmarc.ietf.org&g=
t;; Susan Hares &lt;shares@ndzh.com&gt;; bess@ietf.org; idr@ietf.org<br>
<b>Cc:</b> Hu, Jun (Nokia - US/Mountain View) &lt;jun.hu@nokia.com&gt;<br>
<b>Subject:</b> Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"line-height:12.0pt;background:#FFEB9C"><b><=
span style=3D"font-size:10.5pt;font-family:&quot;Lato&quot;,sans-serif;colo=
r:black">[External Email. Be cautious of content]<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal">I fully agree with Ali.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">I think the VXLAN TLV only makes sense for other fam=
ilies, and not for EVPN. We&#8217;ve done EVPN public interoperability for =
a few years and everyone uses the BGP encap extends community.<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">Jorge&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
<div id=3D"id-b6accf00-1e63-490b-9e0c-ed4bfc7d1250">
<div class=3D"MsoNormal" align=3D"center" style=3D"text-align:center">
<hr size=3D"2" width=3D"98%" noshade=3D"" style=3D"color:black" align=3D"ce=
nter">
</div>
<div id=3D"divRplyFwdMsg">
<p class=3D"MsoNormal"><b>From:</b> BESS &lt;<a href=3D"mailto:bess-bounces=
@ietf.org">bess-bounces@ietf.org</a>&gt; on behalf of Ali Sajassi (sajassi)=
 &lt;<a href=3D"mailto:sajassi=3D40cisco.com@dmarc.ietf.org">sajassi=3D40ci=
sco.com@dmarc.ietf.org</a>&gt;<br>
<b>Sent:</b> Saturday, August 1, 2020 03:18<br>
<b>To:</b> Susan Hares; <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>;=
 <a href=3D"mailto:idr@ietf.org">
idr@ietf.org</a><br>
<b>Cc:</b> Hu, Jun (Nokia - US/Mountain View)<br>
<b>Subject:</b> Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn=
 <o:p>
</o:p></p>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
</div>
<div>
<p class=3D"MsoNormal">Sue,<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I am afraid if we don&#8217;t clean up the draft, it=
 can cause confusion as it has already and result in immediate errata filin=
g for it after publication. A sub-bullet got added to the latest rev (rev17=
) that is not correct. It says that the
 VxLAN sub-tlv is sent with EVPN route when V bit not set. However, EVPN ne=
ver uses this sub-tlv as its routes has all the needed info. Furthermore, R=
FC 8365 is very clear that EVPN uses Tunnel Encapsulation Extended Communit=
y (per section 4.1). As I said,
 I am not aware of any of the vendors using these sub-TVLs and it is easy t=
o have a quick poll.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Regarding the paragraph that got omitted, it is maki=
ng it much more ambiguous than it used to. I would opt for clarifying the p=
aragraph rather than removing it. If needed I can provide an updated paragr=
aph. Section 9 of RFC 8365 specifies
 how a VPN multicast route can be advertised with PMSI tunnel attribute and=
 Encapsulation extended community and has been implemented by many vendors.=
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Cheers,<o:p></o:p></p>
<p class=3D"MsoNormal">Ali<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:12.0pt;color:black">From=
: </span></b><span style=3D"font-size:12.0pt;color:black">Susan Hares &lt;<=
a href=3D"mailto:shares@ndzh.com">shares@ndzh.com</a>&gt;<br>
<b>Date: </b>Friday, July 31, 2020 at 5:02 AM<br>
<b>To: </b>Cisco Employee &lt;<a href=3D"mailto:sajassi@cisco.com">sajassi@=
cisco.com</a>&gt;, &quot;<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>=
&quot; &lt;<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>&gt;, &quot;<a=
 href=3D"mailto:idr@ietf.org">idr@ietf.org</a>&quot; &lt;<a href=3D"mailto:=
idr@ietf.org">idr@ietf.org</a>&gt;<br>
<b>Cc: </b>&quot;'Hu, Jun (Nokia - US/Mountain View)'&quot; &lt;<a href=3D"=
mailto:jun.hu@nokia.com">jun.hu@nokia.com</a>&gt;<br>
<b>Subject: </b>RE: IPSec Tunnels and draft-sajassi-bess-secure-evpn </span=
><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Ali:</span><o:p></o:p>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o:=
p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">It is wise to start wi=
th the RFC6514 and the draft-ietf-idr-tunnel-encapsulation draft..&nbsp;&nb=
sp;
</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o:=
p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">[WG chair hat on] </sp=
an><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">The tunnel-encapsulati=
on draft has passed general WG LC &#8211; so it is inappropriate to call fo=
r the request to remove these sections.&nbsp; The WG LC that is currently r=
unning is whether to remove the &#8220;AS&#8221; field from
 the tunnel endpoint field, and replace it with a reserved field.. </span><=
o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o:=
p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">The implementation pag=
e is on: </span>
<o:p></o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://urldefense.com/v3/__https:/trac.i=
etf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps*20implementations__;JQ!!=
NEt6yMaO-gk!W5VnNHyc3oP29X0LQ_irbSTb8nBnntL-309BArYBPAtGu2up9mlhbj7kYmr1rr8=
$">https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%20imple=
mentations</a><o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">If you wish to provide information on the cisco impl=
ementation, you are welcome to add information on the page.
<o:p></o:p></p>
<p class=3D"MsoNormal">I can call for an update to the page from vendors.<o=
:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">[WG chair hat off[<o:p></o:p></p>
<p class=3D"MsoNormal">[Document shepherd hat on] <o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">The issue is during the edits the text from RFC6514 =
from Eric Rosen was unclear.&nbsp; The text was:
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt;background:white;word-=
break:break-all">
<o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"background:white;word-break:break-all"><spa=
n style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:black=
">&nbsp;&nbsp;&nbsp;It has been suggested that it may sometimes be useful t=
o attach a</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"background:white;word-break:break-all"><spa=
n style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:black=
">&nbsp;&nbsp; Tunnel Encapsulation attribute to a BGP UPDATE message that =
is also</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"background:white;word-break:break-all"><spa=
n style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:black=
">&nbsp;&nbsp; carrying a PMSI (Provider Multicast Service Interface) Tunne=
l</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"background:white;word-break:break-all"><spa=
n style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:black=
">&nbsp;&nbsp; attribute [<a href=3D"https://urldefense.com/v3/__https:/dat=
atracker.ietf.org/doc/html/rfc6514__;!!NEt6yMaO-gk!W5VnNHyc3oP29X0LQ_irbSTb=
8nBnntL-309BArYBPAtGu2up9mlhbj7kV1TIiiU$"><span style=3D"color:#3D22B3">RFC=
6514</span></a>].&nbsp;
 If the PMSI Tunnel attribute specifies an IP</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"background:white;word-break:break-all"><spa=
n style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:black=
">&nbsp;&nbsp; tunnel, the Tunnel Encapsulation attribute could be used to =
provide</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"background:white;word-break:break-all"><spa=
n style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:black=
">&nbsp;&nbsp; additional information about the IP tunnel.&nbsp; The usage =
of the Tunnel</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"background:white;word-break:break-all"><spa=
n style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:black=
">&nbsp;&nbsp; Encapsulation attribute in combination with the PMSI Tunnel =
attribute</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"background:white;word-break:break-all"><spa=
n style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:black=
">&nbsp;&nbsp; is outside the scope of this document.</span><o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Since the text itself was unclear what additional in=
formation could be provided, the authors removed it from the draft.
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">As we had not received any feedback about active RFC=
6514 interactions on the list.
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">[document shepherd off]<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">If you have an implementation of the interaction bet=
ween the RF6514 and tunnel encapsulation, it would be valuable to provide:<=
o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">a) &nbsp;either a draft specifying the interaction y=
ou wish to IDR WG, or &nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">b) &nbsp;comments that could replace the original th=
e original text.
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Since the IDR draft has gone through multiple WG LC =
and a very complete review from Alvaro &#8211; so a quick response would be=
 appreciated. &nbsp;&nbsp;IMHO a draft on the interaction between RFC6514 a=
nd the tunnel-encapsulation draft &#8211; would be the best
 thing at this point.&nbsp; Let me know if you are interested in working on=
 such a draft.
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Sue <o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o:=
p></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,sans-serif">From:</span></b><span style=3D"font-size:10.0pt;f=
ont-family:&quot;Tahoma&quot;,sans-serif"> Ali Sajassi (sajassi) [<a href=
=3D"mailto:sajassi@cisco.com">mailto:sajassi@cisco.com</a>]
<br>
<b>Sent:</b> Friday, July 31, 2020 1:54 AM<br>
<b>To:</b> Susan Hares; <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>;=
 <a href=3D"mailto:idr@ietf.org">
idr@ietf.org</a><br>
<b>Cc:</b> 'Hu, Jun (Nokia - US/Mountain View)'<br>
<b>Subject:</b> Re: IPSec Tunnels and draft-sajassi-bess-secure-evpn </span=
><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&lt;added <a href=3D"mailto:idr@ietf.org">idr@ietf.o=
rg</a>&gt;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Sue,<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Before getting to the discussions of the three IPsec=
 proposals, there are some elements of draft-ietf-idr-tunnel-encaps-17.txt =
that I can see might have caused some confusions and I&#8217;d like to get =
those sorted out first.
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">The tunnel-encap draft specifies sub-tlv for VxLAN, =
VxLAN GDP, and NVGRE in sections 3.2.1, 3.2.2, and 3.2.3. I am not aware of=
 any vendor that has implemented these sub-tlvs because the info in these s=
ub-tlv already exist in EVPN routes
 (e.g., MAC addresses, Ethernet Tags, etc.) which they have implemented it.=
 Therefore, all the vendors that I am aware of use Extended Community &nbsp=
;defined in section 4.1&nbsp; along with EVPN routes to signal VxLAN and GE=
NEVE tunnel types. Furthermore, I am not aware
 of anyone using NVGRE encap! So, as the first step, we should remove these=
 three sections from the draft if there is no objection.
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Cheers,<o:p></o:p></p>
<p class=3D"MsoNormal">Ali<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:12.0pt;color:black">From=
: </span></b><span style=3D"font-size:12.0pt;color:black">Susan Hares &lt;<=
a href=3D"mailto:shares@ndzh.com">shares@ndzh.com</a>&gt;<br>
<b>Date: </b>Tuesday, July 28, 2020 at 8:30 AM<br>
<b>To: </b>Cisco Employee &lt;<a href=3D"mailto:sajassi@cisco.com">sajassi@=
cisco.com</a>&gt;, &quot;<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>=
&quot; &lt;<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>&gt;<br>
<b>Cc: </b>&quot;'Hu, Jun (Nokia - US/Mountain View)'&quot; &lt;<a href=3D"=
mailto:jun.hu@nokia.com">jun.hu@nokia.com</a>&gt;<br>
<b>Subject: </b>IPSec Tunnels and draft-sajassi-bess-secure-evpn </span><o:=
p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal">Ali and bess WG: <o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">IDR has 3 proposals for IPsec tunnels that impact dr=
aft-ietf-idr-tunnel-encaps-17.txt.&nbsp; As an IDR co-chair/shepherd, &nbsp=
;I have been discussing these three drafts (Ali and two other authors sets)=
 to try to find out if we can have one general
 solutions. &nbsp;&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">The discussion has been very fruitful to point up BG=
P issues of interoperability, security, privacy, manageability, and scaling=
..&nbsp; For example, there is a lack of a clear specification between RFC6=
514 (PMSI tunnel attribute) and the tunnel-encaps
 draft that specifies how these drafts interoperate. &nbsp;I suspect the be=
ss and idr chairs will need to discuss if tunnel-encaps has to address this=
 point.
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I wrote up my ideas in draft-hares-idr-bgp-ipsec-ana=
lysis-00.txt so the authors could tell me what I misunderstood.&nbsp; &nbsp=
;You&#8217;ll find this draft stops half way.&nbsp; I have the rest of the =
draft written, but I wanted feedback from all the author
 teams before sending it out. <o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">After hearing some of the details from the authors, =
I would like to sponsor an IDR interim so we could discuss these issues at =
length.&nbsp;&nbsp; If you think this is a good idea, please let me know.
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">One other thing&#8230; unfortunately, I scheduled a =
set of meetings for EDT time after IETF meetings this week.&nbsp; &nbsp;You=
r next response will occur from 11-16 UTC on Wednesday.
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Cheerily, Sue <o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
</div>
</div>
</div>
</div>
</div>
</body>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/DitdmRJ04_IuMfkkseR4zYCpBaw>
Subject: Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn
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John: 

 

Thank you for your history lesson.    Implementation specifics helpful on
the IDR wiki page regarding tunnel-encapsulation draft. 

 

I suggest you chat with John Scudder (one of the co-authors on the draft)
regarding your concerns.  

 

Sue 

 

 

 

From: John E Drake [mailto:jdrake@juniper.net] 
Sent: Sunday, August 2, 2020 11:37 AM
To: Rabadan, Jorge (Nokia - US/Mountain View); Ali Sajassi (sajassi); Susan
Hares; bess@ietf.org; idr@ietf.org
Cc: Hu, Jun (Nokia - US/Mountain View)
Subject: RE: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn

 

Hi,

 

I also agree with Ali.  Eric specifically included the Tunnel Encapsulation
Extended Community in his draft at our request in order to support RFC 8365.
I.e., the draft that became RFC 8365 initially used the Tunnel Encapsulation
Extended Community defined in RFC 5512 and pre-dated by several years the
initial version of Eric's draft, which did not have the Tunnel Encapsulation
Extended Community.

 

Yours Irrespectively,

 

John

 

 

Juniper Business Use Only

From: BESS <bess-bounces@ietf.org> On Behalf Of Rabadan, Jorge (Nokia -
US/Mountain View)
Sent: Saturday, August 1, 2020 4:30 AM
To: Ali Sajassi (sajassi) <sajassi=40cisco.com@dmarc.ietf.org>; Susan Hares
<shares@ndzh.com>; bess@ietf.org; idr@ietf.org
Cc: Hu, Jun (Nokia - US/Mountain View) <jun.hu@nokia.com>
Subject: Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn

 

[External Email. Be cautious of content]

 

I fully agree with Ali.

I think the VXLAN TLV only makes sense for other families, and not for EVPN.
We've done EVPN public interoperability for a few years and everyone uses
the BGP encap extends community.

 

Thanks,

Jorge 

 

  _____  

From: BESS <bess-bounces@ietf.org> on behalf of Ali Sajassi (sajassi)
<sajassi=40cisco.com@dmarc.ietf.org>
Sent: Saturday, August 1, 2020 03:18
To: Susan Hares; bess@ietf.org; idr@ietf.org
Cc: Hu, Jun (Nokia - US/Mountain View)
Subject: Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn 

 

Sue,

 

I am afraid if we don't clean up the draft, it can cause confusion as it has
already and result in immediate errata filing for it after publication. A
sub-bullet got added to the latest rev (rev17) that is not correct. It says
that the VxLAN sub-tlv is sent with EVPN route when V bit not set. However,
EVPN never uses this sub-tlv as its routes has all the needed info.
Furthermore, RFC 8365 is very clear that EVPN uses Tunnel Encapsulation
Extended Community (per section 4.1). As I said, I am not aware of any of
the vendors using these sub-TVLs and it is easy to have a quick poll.

 

Regarding the paragraph that got omitted, it is making it much more
ambiguous than it used to. I would opt for clarifying the paragraph rather
than removing it. If needed I can provide an updated paragraph. Section 9 of
RFC 8365 specifies how a VPN multicast route can be advertised with PMSI
tunnel attribute and Encapsulation extended community and has been
implemented by many vendors.

 

Cheers,

Ali

 

 

From: Susan Hares <shares@ndzh.com>
Date: Friday, July 31, 2020 at 5:02 AM
To: Cisco Employee <sajassi@cisco.com>, "bess@ietf.org" <bess@ietf.org>,
"idr@ietf.org" <idr@ietf.org>
Cc: "'Hu, Jun (Nokia - US/Mountain View)'" <jun.hu@nokia.com>
Subject: RE: IPSec Tunnels and draft-sajassi-bess-secure-evpn 

 

Ali:

 

It is wise to start with the RFC6514 and the
draft-ietf-idr-tunnel-encapsulation draft..   

 

[WG chair hat on] 

The tunnel-encapsulation draft has passed general WG LC - so it is
inappropriate to call for the request to remove these sections.  The WG LC
that is currently running is whether to remove the "AS" field from the
tunnel endpoint field, and replace it with a reserved field.. 

 

The implementation page is on: 

https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%20implement
ations
<https://urldefense.com/v3/__https:/trac.ietf.org/trac/idr/wiki/draft-ietf-i
dr-tunnel-encaps*20implementations__;JQ!!NEt6yMaO-gk!W5VnNHyc3oP29X0LQ_irbST
b8nBnntL-309BArYBPAtGu2up9mlhbj7kYmr1rr8$> 

 

If you wish to provide information on the cisco implementation, you are
welcome to add information on the page. 

I can call for an update to the page from vendors.

 

[WG chair hat off[

[Document shepherd hat on] 

 

The issue is during the edits the text from RFC6514 from Eric Rosen was
unclear.  The text was: 

 

   It has been suggested that it may sometimes be useful to attach a

   Tunnel Encapsulation attribute to a BGP UPDATE message that is also

   carrying a PMSI (Provider Multicast Service Interface) Tunnel

   attribute [
<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/html/rfc6514__;
!!NEt6yMaO-gk!W5VnNHyc3oP29X0LQ_irbSTb8nBnntL-309BArYBPAtGu2up9mlhbj7kV1TIii
U$> RFC6514].  If the PMSI Tunnel attribute specifies an IP

   tunnel, the Tunnel Encapsulation attribute could be used to provide

   additional information about the IP tunnel.  The usage of the Tunnel

   Encapsulation attribute in combination with the PMSI Tunnel attribute

   is outside the scope of this document.

 

Since the text itself was unclear what additional information could be
provided, the authors removed it from the draft. 

 

As we had not received any feedback about active RFC6514 interactions on the
list. 

 

[document shepherd off]

 

If you have an implementation of the interaction between the RF6514 and
tunnel encapsulation, it would be valuable to provide:

 

a)  either a draft specifying the interaction you wish to IDR WG, or  

b)  comments that could replace the original the original text. 

 

Since the IDR draft has gone through multiple WG LC and a very complete
review from Alvaro - so a quick response would be appreciated.   IMHO a
draft on the interaction between RFC6514 and the tunnel-encapsulation draft
- would be the best thing at this point.  Let me know if you are interested
in working on such a draft. 

 

Sue 

 

 

From: Ali Sajassi (sajassi) [mailto:sajassi@cisco.com] 
Sent: Friday, July 31, 2020 1:54 AM
To: Susan Hares; bess@ietf.org; idr@ietf.org
Cc: 'Hu, Jun (Nokia - US/Mountain View)'
Subject: Re: IPSec Tunnels and draft-sajassi-bess-secure-evpn 

 

<added idr@ietf.org>

 

Sue,

 

Before getting to the discussions of the three IPsec proposals, there are
some elements of draft-ietf-idr-tunnel-encaps-17.txt that I can see might
have caused some confusions and I'd like to get those sorted out first. 

 

The tunnel-encap draft specifies sub-tlv for VxLAN, VxLAN GDP, and NVGRE in
sections 3.2.1, 3.2.2, and 3.2.3. I am not aware of any vendor that has
implemented these sub-tlvs because the info in these sub-tlv already exist
in EVPN routes (e.g., MAC addresses, Ethernet Tags, etc.) which they have
implemented it. Therefore, all the vendors that I am aware of use Extended
Community  defined in section 4.1  along with EVPN routes to signal VxLAN
and GENEVE tunnel types. Furthermore, I am not aware of anyone using NVGRE
encap! So, as the first step, we should remove these three sections from the
draft if there is no objection. 

 

Cheers,

Ali

 

From: Susan Hares <shares@ndzh.com>
Date: Tuesday, July 28, 2020 at 8:30 AM
To: Cisco Employee <sajassi@cisco.com>, "bess@ietf.org" <bess@ietf.org>
Cc: "'Hu, Jun (Nokia - US/Mountain View)'" <jun.hu@nokia.com>
Subject: IPSec Tunnels and draft-sajassi-bess-secure-evpn 

 

Ali and bess WG: 

 

IDR has 3 proposals for IPsec tunnels that impact
draft-ietf-idr-tunnel-encaps-17.txt.  As an IDR co-chair/shepherd,  I have
been discussing these three drafts (Ali and two other authors sets) to try
to find out if we can have one general solutions.   

 

The discussion has been very fruitful to point up BGP issues of
interoperability, security, privacy, manageability, and scaling..  For
example, there is a lack of a clear specification between RFC6514 (PMSI
tunnel attribute) and the tunnel-encaps draft that specifies how these
drafts interoperate.  I suspect the bess and idr chairs will need to discuss
if tunnel-encaps has to address this point. 

 

I wrote up my ideas in draft-hares-idr-bgp-ipsec-analysis-00.txt so the
authors could tell me what I misunderstood.   You'll find this draft stops
half way.  I have the rest of the draft written, but I wanted feedback from
all the author teams before sending it out. 

 

After hearing some of the details from the authors, I would like to sponsor
an IDR interim so we could discuss these issues at length.   If you think
this is a good idea, please let me know. 

 

One other thing. unfortunately, I scheduled a set of meetings for EDT time
after IETF meetings this week.   Your next response will occur from 11-16
UTC on Wednesday. 

 

Cheerily, Sue 

 

 


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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>John: <o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Thank you for your =
history lesson. &nbsp;&nbsp;&nbsp;Implementation specifics helpful on =
the IDR wiki page regarding tunnel-encapsulation draft. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>I suggest you chat with =
John Scudder (one of the co-authors on the draft) regarding your =
concerns. &nbsp;<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>Sue =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
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 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
John E Drake [mailto:jdrake@juniper.net] <br><b>Sent:</b> Sunday, August =
2, 2020 11:37 AM<br><b>To:</b> Rabadan, Jorge (Nokia - US/Mountain =
View); Ali Sajassi (sajassi); Susan Hares; bess@ietf.org; =
idr@ietf.org<br><b>Cc:</b> Hu, Jun (Nokia - US/Mountain =
View)<br><b>Subject:</b> RE: [bess] IPSec Tunnels and =
draft-sajassi-bess-secure-evpn<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>Hi,<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>I also agree =
with Ali.&nbsp; Eric specifically included the Tunnel Encapsulation =
Extended Community in his draft at our request in order to support RFC =
8365.&nbsp; I.e., the draft that became RFC 8365 initially used the =
Tunnel Encapsulation Extended Community defined in RFC 5512 and =
pre-dated by several years the initial version of Eric&#8217;s draft, =
which did not have the Tunnel Encapsulation Extended =
Community.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><p class=3DMsoNormal>Yours =
Irrespectively,<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal>John<o:p></o:p></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3Dmsipfooter30b3d538 =
align=3Dcenter =
style=3D'margin:0in;margin-bottom:.0001pt;text-align:center'><span =
style=3D'font-size:7.0pt;color:black'>Juniper Business Use =
Only</span><o:p></o:p></p><div style=3D'border:none;border-left:solid =
blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b>From:</b> BESS =
&lt;bess-bounces@ietf.org&gt; <b>On Behalf Of </b>Rabadan, Jorge (Nokia =
- US/Mountain View)<br><b>Sent:</b> Saturday, August 1, 2020 4:30 =
AM<br><b>To:</b> Ali Sajassi (sajassi) =
&lt;sajassi=3D40cisco.com@dmarc.ietf.org&gt;; Susan Hares =
&lt;shares@ndzh.com&gt;; bess@ietf.org; idr@ietf.org<br><b>Cc:</b> Hu, =
Jun (Nokia - US/Mountain View) =
&lt;jun.hu@nokia.com&gt;<br><b>Subject:</b> Re: [bess] IPSec Tunnels and =
draft-sajassi-bess-secure-evpn<o:p></o:p></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal =
style=3D'line-height:12.0pt;background:#FFEB9C'><b><span =
style=3D'font-size:10.5pt;font-family:Lato;color:black'>[External Email. =
Be cautious of content]<o:p></o:p></span></b></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><div><div><p =
class=3DMsoNormal>I fully agree with Ali.<o:p></o:p></p></div><div><p =
class=3DMsoNormal>I think the VXLAN TLV only makes sense for other =
families, and not for EVPN. We&#8217;ve done EVPN public =
interoperability for a few years and everyone uses the BGP encap extends =
community.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Thanks,<o:p></o:p></p></div><div><p =
class=3DMsoNormal>Jorge&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div></div><div =
id=3Did-b6accf00-1e63-490b-9e0c-ed4bfc7d1250><div class=3DMsoNormal =
align=3Dcenter style=3D'text-align:center'><hr size=3D2 width=3D"98%" =
noshade style=3D'color:black' align=3Dcenter></div><div =
id=3DdivRplyFwdMsg><p class=3DMsoNormal><b>From:</b> BESS &lt;<a =
href=3D"mailto:bess-bounces@ietf.org">bess-bounces@ietf.org</a>&gt; on =
behalf of Ali Sajassi (sajassi) &lt;<a =
href=3D"mailto:sajassi=3D40cisco.com@dmarc.ietf.org">sajassi=3D40cisco.co=
m@dmarc.ietf.org</a>&gt;<br><b>Sent:</b> Saturday, August 1, 2020 =
03:18<br><b>To:</b> Susan Hares; <a =
href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a =
href=3D"mailto:idr@ietf.org">idr@ietf.org</a><br><b>Cc:</b> Hu, Jun =
(Nokia - US/Mountain View)<br><b>Subject:</b> Re: [bess] IPSec Tunnels =
and draft-sajassi-bess-secure-evpn <o:p></o:p></p><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><p =
class=3DMsoNormal>Sue,<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>I am afraid =
if we don&#8217;t clean up the draft, it can cause confusion as it has =
already and result in immediate errata filing for it after publication. =
A sub-bullet got added to the latest rev (rev17) that is not correct. It =
says that the VxLAN sub-tlv is sent with EVPN route when V bit not set. =
However, EVPN never uses this sub-tlv as its routes has all the needed =
info. Furthermore, RFC 8365 is very clear that EVPN uses Tunnel =
Encapsulation Extended Community (per section 4.1). As I said, I am not =
aware of any of the vendors using these sub-TVLs and it is easy to have =
a quick poll.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>Regarding the paragraph that got omitted, it is making =
it much more ambiguous than it used to. I would opt for clarifying the =
paragraph rather than removing it. If needed I can provide an updated =
paragraph. Section 9 of RFC 8365 specifies how a VPN multicast route can =
be advertised with PMSI tunnel attribute and Encapsulation extended =
community and has been implemented by many vendors.<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>Cheers,<o:p></o:p></p><p =
class=3DMsoNormal>Ali<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:12.0pt;color:black'>From: </span></b><span =
style=3D'font-size:12.0pt;color:black'>Susan Hares &lt;<a =
href=3D"mailto:shares@ndzh.com">shares@ndzh.com</a>&gt;<br><b>Date: =
</b>Friday, July 31, 2020 at 5:02 AM<br><b>To: </b>Cisco Employee &lt;<a =
href=3D"mailto:sajassi@cisco.com">sajassi@cisco.com</a>&gt;, &quot;<a =
href=3D"mailto:bess@ietf.org">bess@ietf.org</a>&quot; &lt;<a =
href=3D"mailto:bess@ietf.org">bess@ietf.org</a>&gt;, &quot;<a =
href=3D"mailto:idr@ietf.org">idr@ietf.org</a>&quot; &lt;<a =
href=3D"mailto:idr@ietf.org">idr@ietf.org</a>&gt;<br><b>Cc: =
</b>&quot;'Hu, Jun (Nokia - US/Mountain View)'&quot; &lt;<a =
href=3D"mailto:jun.hu@nokia.com">jun.hu@nokia.com</a>&gt;<br><b>Subject: =
</b>RE: IPSec Tunnels and draft-sajassi-bess-secure-evpn =
</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>Ali:</span><o:p></o:p></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>It is wise to start with =
the RFC6514 and the draft-ietf-idr-tunnel-encapsulation =
draft..&nbsp;&nbsp; </span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>[WG chair hat on] =
</span><o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>The tunnel-encapsulation draft has passed =
general WG LC &#8211; so it is inappropriate to call for the request to =
remove these sections.&nbsp; The WG LC that is currently running is =
whether to remove the &#8220;AS&#8221; field from the tunnel endpoint =
field, and replace it with a reserved field.. </span><o:p></o:p></p><p =
class=3DMsoNormal><span =
style=3D'color:#1F497D'>&nbsp;</span><o:p></o:p></p><p =
class=3DMsoNormal><span style=3D'color:#1F497D'>The implementation page =
is on: </span><o:p></o:p></p><p class=3DMsoNormal><a =
href=3D"https://urldefense.com/v3/__https:/trac.ietf.org/trac/idr/wiki/dr=
aft-ietf-idr-tunnel-encaps*20implementations__;JQ!!NEt6yMaO-gk!W5VnNHyc3o=
P29X0LQ_irbSTb8nBnntL-309BArYBPAtGu2up9mlhbj7kYmr1rr8$">https://trac.ietf=
.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%20implementations</a><o:p=
></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>If you wish to provide information on the cisco =
implementation, you are welcome to add information on the page. =
<o:p></o:p></p><p class=3DMsoNormal>I can call for an update to the page =
from vendors.<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>[WG chair hat off[<o:p></o:p></p><p =
class=3DMsoNormal>[Document shepherd hat on] <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>The issue is =
during the edits the text from RFC6514 from Eric Rosen was =
unclear.&nbsp; The text was: <o:p></o:p></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt;background:white;word-break:break-all'><o:p=
>&nbsp;</o:p></p><p class=3DMsoNormal =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp;&nbsp;It has been suggested that it may =
sometimes be useful to attach a</span><o:p></o:p></p><p =
class=3DMsoNormal style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; Tunnel Encapsulation attribute to a BGP =
UPDATE message that is also</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; carrying a PMSI (Provider Multicast =
Service Interface) Tunnel</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; attribute [<a =
href=3D"https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/html/=
rfc6514__;!!NEt6yMaO-gk!W5VnNHyc3oP29X0LQ_irbSTb8nBnntL-309BArYBPAtGu2up9=
mlhbj7kV1TIiiU$"><span =
style=3D'color:#3D22B3'>RFC6514</span></a>].&nbsp; If the PMSI Tunnel =
attribute specifies an IP</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; tunnel, the Tunnel Encapsulation =
attribute could be used to provide</span><o:p></o:p></p><p =
class=3DMsoNormal style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; additional information about the IP =
tunnel.&nbsp; The usage of the Tunnel</span><o:p></o:p></p><p =
class=3DMsoNormal style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; Encapsulation attribute in combination =
with the PMSI Tunnel attribute</span><o:p></o:p></p><p class=3DMsoNormal =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp; is outside the scope of this =
document.</span><o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>Since the =
text itself was unclear what additional information could be provided, =
the authors removed it from the draft. <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>As we had =
not received any feedback about active RFC6514 interactions on the list. =
<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>[document shepherd off]<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>If you have =
an implementation of the interaction between the RF6514 and tunnel =
encapsulation, it would be valuable to provide:<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>a) =
&nbsp;either a draft specifying the interaction you wish to IDR WG, or =
&nbsp;<o:p></o:p></p><p class=3DMsoNormal>b) &nbsp;comments that could =
replace the original the original text. <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>Since the =
IDR draft has gone through multiple WG LC and a very complete review =
from Alvaro &#8211; so a quick response would be appreciated. =
&nbsp;&nbsp;IMHO a draft on the interaction between RFC6514 and the =
tunnel-encapsulation draft &#8211; would be the best thing at this =
point.&nbsp; Let me know if you are interested in working on such a =
draft. <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>Sue <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'color:#1F497D'>&nbsp;</span><o:p></o:p></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
Ali Sajassi (sajassi) [<a =
href=3D"mailto:sajassi@cisco.com">mailto:sajassi@cisco.com</a>] =
<br><b>Sent:</b> Friday, July 31, 2020 1:54 AM<br><b>To:</b> Susan =
Hares; <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a =
href=3D"mailto:idr@ietf.org">idr@ietf.org</a><br><b>Cc:</b> 'Hu, Jun =
(Nokia - US/Mountain View)'<br><b>Subject:</b> Re: IPSec Tunnels and =
draft-sajassi-bess-secure-evpn </span><o:p></o:p></p></div></div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&lt;added <a =
href=3D"mailto:idr@ietf.org">idr@ietf.org</a>&gt;<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>Sue,<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p class=3DMsoNormal>Before =
getting to the discussions of the three IPsec proposals, there are some =
elements of draft-ietf-idr-tunnel-encaps-17.txt that I can see might =
have caused some confusions and I&#8217;d like to get those sorted out =
first. <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>The tunnel-encap draft specifies sub-tlv for VxLAN, =
VxLAN GDP, and NVGRE in sections 3.2.1, 3.2.2, and 3.2.3. I am not aware =
of any vendor that has implemented these sub-tlvs because the info in =
these sub-tlv already exist in EVPN routes (e.g., MAC addresses, =
Ethernet Tags, etc.) which they have implemented it. Therefore, all the =
vendors that I am aware of use Extended Community &nbsp;defined in =
section 4.1&nbsp; along with EVPN routes to signal VxLAN and GENEVE =
tunnel types. Furthermore, I am not aware of anyone using NVGRE encap! =
So, as the first step, we should remove these three sections from the =
draft if there is no objection. <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>Cheers,<o:p></o:p></p><p =
class=3DMsoNormal>Ali<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b><span =
style=3D'font-size:12.0pt;color:black'>From: </span></b><span =
style=3D'font-size:12.0pt;color:black'>Susan Hares &lt;<a =
href=3D"mailto:shares@ndzh.com">shares@ndzh.com</a>&gt;<br><b>Date: =
</b>Tuesday, July 28, 2020 at 8:30 AM<br><b>To: </b>Cisco Employee =
&lt;<a href=3D"mailto:sajassi@cisco.com">sajassi@cisco.com</a>&gt;, =
&quot;<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>&quot; &lt;<a =
href=3D"mailto:bess@ietf.org">bess@ietf.org</a>&gt;<br><b>Cc: =
</b>&quot;'Hu, Jun (Nokia - US/Mountain View)'&quot; &lt;<a =
href=3D"mailto:jun.hu@nokia.com">jun.hu@nokia.com</a>&gt;<br><b>Subject: =
</b>IPSec Tunnels and draft-sajassi-bess-secure-evpn =
</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><p class=3DMsoNormal>Ali =
and bess WG: <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>IDR has 3 proposals for IPsec tunnels that impact =
draft-ietf-idr-tunnel-encaps-17.txt.&nbsp; As an IDR co-chair/shepherd, =
&nbsp;I have been discussing these three drafts (Ali and two other =
authors sets) to try to find out if we can have one general solutions. =
&nbsp;&nbsp;<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>The discussion has been very fruitful to point up BGP =
issues of interoperability, security, privacy, manageability, and =
scaling..&nbsp; For example, there is a lack of a clear specification =
between RFC6514 (PMSI tunnel attribute) and the tunnel-encaps draft that =
specifies how these drafts interoperate. &nbsp;I suspect the bess and =
idr chairs will need to discuss if tunnel-encaps has to address this =
point. <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>I wrote up my ideas in =
draft-hares-idr-bgp-ipsec-analysis-00.txt so the authors could tell me =
what I misunderstood.&nbsp; &nbsp;You&#8217;ll find this draft stops =
half way.&nbsp; I have the rest of the draft written, but I wanted =
feedback from all the author teams before sending it out. =
<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>After hearing some of the details from the authors, I =
would like to sponsor an IDR interim so we could discuss these issues at =
length.&nbsp;&nbsp; If you think this is a good idea, please let me =
know. <o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>One other thing&#8230; unfortunately, I scheduled a =
set of meetings for EDT time after IETF meetings this week.&nbsp; =
&nbsp;Your next response will occur from 11-16 UTC on Wednesday. =
<o:p></o:p></p><p class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>Cheerily, Sue <o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div></div></div></div></di=
v></body></html>
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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: Susan Hares <shares@ndzh.com>, "'Ali Sajassi (sajassi)'" <sajassi=40cisco.com@dmarc.ietf.org>, "bess@ietf.org" <bess@ietf.org>, "idr@ietf.org" <idr@ietf.org>
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Thread-Topic: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn
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Subject: Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn
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--_000_MWHPR08MB352041F2174DFFD109EE52A1F74D0MWHPR08MB3520namp_
Content-Type: text/plain; charset="Windows-1252"
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Sue and authors,

To be clear, and John/Ali can chime in too, what I think we are saying is:

  *   people use RFC8365 as the reference to implement EVPN for VXLAN, VXLA=
N GPE, NVGRE and MPLS-in-GRE.
  *   RFC8365 uses the encapsulation extended community described in sectio=
n 4.1 of the tunnel-encaps draft, and not the sub-TLVs in section 3.2.
  *   Because of that, new implementers of EVPN could be confused whether t=
o use the encap extended community or the sub-TLVs. And the use of the latt=
er would lead to interop issues.

Because of that, I am not suggesting to remove the TLVs in section 3.2, *bu=
t* I am asking to add a sentence in section 3.2 saying something like =93Th=
e Encapsulation Sub-TLVs specified in sections 3.2.1, 3.2.2, 3.2.3 and 3.2.=
6 MUST NOT be used along with BGP UPDATE messages of AFI/SAFI 25/70 (EVPN).=
=94

NOTE: the sub-TLVs are not useful for EVPN but can still be used with other=
 families, i.e. 1/128 or 2/128, hence they should be kept in the document.

Now, Sue, authors, would that be possible?
@Sue, I=92m happy to provide information about our EVPN implementation in t=
he wiki, but it is about RFC8365 and not the tunnel-encaps draft. We can al=
so point at this public interop report [1], where all the vendors listed in=
 the EVPN tests for VXLAN encapsulation use the BGP encapsulation extended =
community and NOT the sub-TLVs used in section 3.2 of the tunnel-encaps dra=
ft.

[1] http://www.eantc.de/fileadmin/eantc/downloads/events/MPLS2020/EANTC-MPL=
SSDNNFV2020-WhitePaper.pdf


Thanks.
Jorge


From: Susan Hares <shares@ndzh.com>
Date: Saturday, August 1, 2020 at 1:39 PM
To: Rabadan, Jorge (Nokia - US/Mountain View) <jorge.rabadan@nokia.com>, 'A=
li Sajassi (sajassi)' <sajassi=3D40cisco.com@dmarc.ietf.org>, bess@ietf.org=
 <bess@ietf.org>, idr@ietf.org <idr@ietf.org>
Cc: Hu, Jun (Nokia - US/Mountain View) <jun.hu@nokia.com>
Subject: RE: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn
Rabadan:

Thank you for your input.   Please review the details of the message I sent=
 to Ali.

Synopsis:
[IDR Chair hat]  We welcome implementation reports at:
https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%20implemen=
tations

It=92s hard to ask authors to re-open old issues unless you have specific i=
mplementation issues
substantiated on the wiki with an implementation report.
You can put a comment at the bottom if you are unclear about the format.
The person who puts the information must provide a name and an email addres=
s.
[IDR Chair hat off]
[Shepherd hat on] I will await the authors response to your queries on EVPN=
.  [Shepherd hat off]

Thank you for bring up the EVPN related issues.

Cheerily, Susan Hares


From: BESS [mailto:bess-bounces@ietf.org] On Behalf Of Rabadan, Jorge (Noki=
a - US/Mountain View)
Sent: Saturday, August 1, 2020 4:30 AM
To: Ali Sajassi (sajassi); Susan Hares; bess@ietf.org; idr@ietf.org
Cc: Hu, Jun (Nokia - US/Mountain View)
Subject: Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn

I fully agree with Ali.
I think the VXLAN TLV only makes sense for other families, and not for EVPN=
. We=92ve done EVPN public interoperability for a few years and everyone us=
es the BGP encap extends community.

Thanks,
Jorge

________________________________
From: BESS <bess-bounces@ietf.org> on behalf of Ali Sajassi (sajassi) <saja=
ssi=3D40cisco.com@dmarc.ietf.org>
Sent: Saturday, August 1, 2020 03:18
To: Susan Hares; bess@ietf.org; idr@ietf.org
Cc: Hu, Jun (Nokia - US/Mountain View)
Subject: Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn

Sue,

I am afraid if we don=92t clean up the draft, it can cause confusion as it =
has already and result in immediate errata filing for it after publication.=
 A sub-bullet got added to the latest rev (rev17) that is not correct. It s=
ays that the VxLAN sub-tlv is sent with EVPN route when V bit not set. Howe=
ver, EVPN never uses this sub-tlv as its routes has all the needed info. Fu=
rthermore, RFC 8365 is very clear that EVPN uses Tunnel Encapsulation Exten=
ded Community (per section 4.1). As I said, I am not aware of any of the ve=
ndors using these sub-TVLs and it is easy to have a quick poll.

Regarding the paragraph that got omitted, it is making it much more ambiguo=
us than it used to. I would opt for clarifying the paragraph rather than re=
moving it. If needed I can provide an updated paragraph. Section 9 of RFC 8=
365 specifies how a VPN multicast route can be advertised with PMSI tunnel =
attribute and Encapsulation extended community and has been implemented by =
many vendors.

Cheers,
Ali


From: Susan Hares <shares@ndzh.com>
Date: Friday, July 31, 2020 at 5:02 AM
To: Cisco Employee <sajassi@cisco.com>, "bess@ietf.org" <bess@ietf.org>, "i=
dr@ietf.org" <idr@ietf.org>
Cc: "'Hu, Jun (Nokia - US/Mountain View)'" <jun.hu@nokia.com>
Subject: RE: IPSec Tunnels and draft-sajassi-bess-secure-evpn

Ali:

It is wise to start with the RFC6514 and the draft-ietf-idr-tunnel-encapsul=
ation draft..

[WG chair hat on]
The tunnel-encapsulation draft has passed general WG LC =96 so it is inappr=
opriate to call for the request to remove these sections.  The WG LC that i=
s currently running is whether to remove the =93AS=94 field from the tunnel=
 endpoint field, and replace it with a reserved field..

The implementation page is on:
https://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%20implemen=
tations

If you wish to provide information on the cisco implementation, you are wel=
come to add information on the page.
I can call for an update to the page from vendors.

[WG chair hat off[
[Document shepherd hat on]

The issue is during the edits the text from RFC6514 from Eric Rosen was unc=
lear.  The text was:



   It has been suggested that it may sometimes be useful to attach a
   Tunnel Encapsulation attribute to a BGP UPDATE message that is also
   carrying a PMSI (Provider Multicast Service Interface) Tunnel
   attribute [RFC6514<https://datatracker.ietf.org/doc/html/rfc6514>].  If =
the PMSI Tunnel attribute specifies an IP
   tunnel, the Tunnel Encapsulation attribute could be used to provide
   additional information about the IP tunnel.  The usage of the Tunnel
   Encapsulation attribute in combination with the PMSI Tunnel attribute
   is outside the scope of this document.

Since the text itself was unclear what additional information could be prov=
ided, the authors removed it from the draft.

As we had not received any feedback about active RFC6514 interactions on th=
e list.

[document shepherd off]

If you have an implementation of the interaction between the RF6514 and tun=
nel encapsulation, it would be valuable to provide:

a)  either a draft specifying the interaction you wish to IDR WG, or
b)  comments that could replace the original the original text.

Since the IDR draft has gone through multiple WG LC and a very complete rev=
iew from Alvaro =96 so a quick response would be appreciated.   IMHO a draf=
t on the interaction between RFC6514 and the tunnel-encapsulation draft =96=
 would be the best thing at this point.  Let me know if you are interested =
in working on such a draft.

Sue


From: Ali Sajassi (sajassi) [mailto:sajassi@cisco.com]
Sent: Friday, July 31, 2020 1:54 AM
To: Susan Hares; bess@ietf.org; idr@ietf.org
Cc: 'Hu, Jun (Nokia - US/Mountain View)'
Subject: Re: IPSec Tunnels and draft-sajassi-bess-secure-evpn

<added idr@ietf.org>

Sue,

Before getting to the discussions of the three IPsec proposals, there are s=
ome elements of draft-ietf-idr-tunnel-encaps-17.txt that I can see might ha=
ve caused some confusions and I=92d like to get those sorted out first.

The tunnel-encap draft specifies sub-tlv for VxLAN, VxLAN GDP, and NVGRE in=
 sections 3.2.1, 3.2.2, and 3.2.3. I am not aware of any vendor that has im=
plemented these sub-tlvs because the info in these sub-tlv already exist in=
 EVPN routes (e.g., MAC addresses, Ethernet Tags, etc.) which they have imp=
lemented it. Therefore, all the vendors that I am aware of use Extended Com=
munity  defined in section 4.1  along with EVPN routes to signal VxLAN and =
GENEVE tunnel types. Furthermore, I am not aware of anyone using NVGRE enca=
p! So, as the first step, we should remove these three sections from the dr=
aft if there is no objection.

Cheers,
Ali

From: Susan Hares <shares@ndzh.com>
Date: Tuesday, July 28, 2020 at 8:30 AM
To: Cisco Employee <sajassi@cisco.com>, "bess@ietf.org" <bess@ietf.org>
Cc: "'Hu, Jun (Nokia - US/Mountain View)'" <jun.hu@nokia.com>
Subject: IPSec Tunnels and draft-sajassi-bess-secure-evpn

Ali and bess WG:

IDR has 3 proposals for IPsec tunnels that impact draft-ietf-idr-tunnel-enc=
aps-17.txt.  As an IDR co-chair/shepherd,  I have been discussing these thr=
ee drafts (Ali and two other authors sets) to try to find out if we can hav=
e one general solutions.

The discussion has been very fruitful to point up BGP issues of interoperab=
ility, security, privacy, manageability, and scaling..  For example, there =
is a lack of a clear specification between RFC6514 (PMSI tunnel attribute) =
and the tunnel-encaps draft that specifies how these drafts interoperate.  =
I suspect the bess and idr chairs will need to discuss if tunnel-encaps has=
 to address this point.

I wrote up my ideas in draft-hares-idr-bgp-ipsec-analysis-00.txt so the aut=
hors could tell me what I misunderstood.   You=92ll find this draft stops h=
alf way.  I have the rest of the draft written, but I wanted feedback from =
all the author teams before sending it out.

After hearing some of the details from the authors, I would like to sponsor=
 an IDR interim so we could discuss these issues at length.   If you think =
this is a good idea, please let me know.

One other thing=85 unfortunately, I scheduled a set of meetings for EDT tim=
e after IETF meetings this week.   Your next response will occur from 11-16=
 UTC on Wednesday.

Cheerily, Sue



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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Sue and authors,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">To be clear, and John/Ali can chime in too, what I think we are saying is=
:<o:p></o:p></span></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l0 level1 =
lfo1"><span style=3D"font-size:10.5pt;font-family:Consolas">people use RFC8=
365 as the reference to implement EVPN for VXLAN, VXLAN GPE, NVGRE and MPLS=
-in-GRE.<o:p></o:p></span></li><li class=3D"MsoListParagraph" style=3D"marg=
in-left:0cm;mso-list:l0 level1 lfo1"><span style=3D"font-size:10.5pt;font-f=
amily:Consolas">RFC8365 uses the encapsulation extended community described=
 in section 4.1 of the tunnel-encaps draft, and not the sub-TLVs in section
 3.2.<o:p></o:p></span></li><li class=3D"MsoListParagraph" style=3D"margin-=
left:0cm;mso-list:l0 level1 lfo1"><span style=3D"font-size:10.5pt;font-fami=
ly:Consolas">Because of that, new implementers of EVPN could be confused wh=
ether to use the encap extended community or the sub-TLVs. And the
 use of the latter would lead to interop issues.<o:p></o:p></span></li></ul=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Because of that, I am not suggesting to remove the TLVs in section 3.2, *=
<b>but</b>* I am asking to add a sentence in section 3.2 saying something l=
ike =93The Encapsulation Sub-TLVs specified
 in sections 3.2.1, 3.2.2, 3.2.3 and 3.2.6 MUST NOT be used along with BGP =
UPDATE messages of AFI/SAFI 25/70 (EVPN).=94<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">NOTE: the sub-TLVs are not useful for EVPN but can still be used with oth=
er families, i.e. 1/128 or 2/128, hence they should be kept in the document=
.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Now, Sue, authors, would that be possible?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">@Sue, I=92m happy to provide information about our EVPN implementation in=
 the wiki, but it is about RFC8365 and not the tunnel-encaps draft. We can =
also point at this public interop report
 [1], where all the vendors listed in the EVPN tests for VXLAN encapsulatio=
n use the BGP encapsulation extended community and NOT the sub-TLVs used in=
 section 3.2 of the tunnel-encaps draft.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal">[1] <u><span style=3D"color:blue"><a href=3D"http://=
www.eantc.de/fileadmin/eantc/downloads/events/MPLS2020/EANTC-MPLSSDNNFV2020=
-WhitePaper.pdf">http://www.eantc.de/fileadmin/eantc/downloads/events/MPLS2=
020/EANTC-MPLSSDNNFV2020-WhitePaper.pdf</a></span></u><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Thanks.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Jorge<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><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=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:12.0pt;margin-left:36.0pt">
<b><span style=3D"font-size:12.0pt;color:black">From: </span></b><span styl=
e=3D"font-size:12.0pt;color:black">Susan Hares &lt;shares@ndzh.com&gt;<br>
<b>Date: </b>Saturday, August 1, 2020 at 1:39 PM<br>
<b>To: </b>Rabadan, Jorge (Nokia - US/Mountain View) &lt;jorge.rabadan@noki=
a.com&gt;, 'Ali Sajassi (sajassi)' &lt;sajassi=3D40cisco.com@dmarc.ietf.org=
&gt;, bess@ietf.org &lt;bess@ietf.org&gt;, idr@ietf.org &lt;idr@ietf.org&gt=
;<br>
<b>Cc: </b>Hu, Jun (Nokia - US/Mountain View) &lt;jun.hu@nokia.com&gt;<br>
<b>Subject: </b>RE: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn=
<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">Rabadan:
</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">Thank you for your input.&nbsp;&nbsp; Please review the details of t=
he message I sent to Ali.
</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">Synopsis:
</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">[IDR Chair hat]&nbsp; We welcome implementation reports at:
</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><a href=3D"https://trac=
.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%20implementations">htt=
ps://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%20implementat=
ions</a><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">It=92s hard to ask auth=
ors to re-open old issues unless you have specific implementation issues<o:=
p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">substantiated on the wi=
ki with an implementation report.&nbsp;&nbsp;
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">You can put a comment a=
t the bottom if you are unclear about the format.
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">The person who puts the=
 information must provide a name and an email address. &nbsp;<o:p></o:p></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">[IDR Chair hat off]<o:p=
></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">[Shepherd hat on] I wil=
l await the authors response to your queries on EVPN. &nbsp;[Shepherd hat o=
ff]
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Thank you for bring up =
the EVPN related issues.&nbsp;
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Cheerily, Susan Hares <=
o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">&nbsp;</span><o:p></o:p></p>
<div>
<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:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif">From:</span></b><spa=
n style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif"> BES=
S [mailto:bess-bounces@ietf.org]
<b>On Behalf Of </b>Rabadan, Jorge (Nokia - US/Mountain View)<br>
<b>Sent:</b> Saturday, August 1, 2020 4:30 AM<br>
<b>To:</b> Ali Sajassi (sajassi); Susan Hares; bess@ietf.org; idr@ietf.org<=
br>
<b>Cc:</b> Hu, Jun (Nokia - US/Mountain View)<br>
<b>Subject:</b> Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn=
</span><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">I fully agree with Ali.=
<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">I think the VXLAN TLV o=
nly makes sense for other families, and not for EVPN. We=92ve done EVPN pub=
lic interoperability for a few years and everyone uses the BGP encap extend=
s community.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Thanks,<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Jorge&nbsp;<o:p></o:p><=
/p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
</div>
</div>
<div id=3D"id-b6accf00-1e63-490b-9e0c-ed4bfc7d1250">
<div class=3D"MsoNormal" align=3D"center" style=3D"margin-left:36.0pt;text-=
align:center">
<hr size=3D"0" width=3D"100%" noshade=3D"" style=3D"color:black" align=3D"c=
enter">
</div>
<div id=3D"divRplyFwdMsg">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b>From:</b> BESS &lt;b=
ess-bounces@ietf.org&gt; on behalf of Ali Sajassi (sajassi) &lt;sajassi=3D4=
0cisco.com@dmarc.ietf.org&gt;<br>
<b>Sent:</b> Saturday, August 1, 2020 03:18<br>
<b>To:</b> Susan Hares; bess@ietf.org; idr@ietf.org<br>
<b>Cc:</b> Hu, Jun (Nokia - US/Mountain View)<br>
<b>Subject:</b> Re: [bess] IPSec Tunnels and draft-sajassi-bess-secure-evpn=
 <o:p>
</o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Sue,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">I am afraid if we don=
=92t clean up the draft, it can cause confusion as it has already and resul=
t in immediate errata filing for it after publication. A sub-bullet got add=
ed to the latest rev (rev17) that is not
 correct. It says that the VxLAN sub-tlv is sent with EVPN route when V bit=
 not set. However, EVPN never uses this sub-tlv as its routes has all the n=
eeded info. Furthermore, RFC 8365 is very clear that EVPN uses Tunnel Encap=
sulation Extended Community (per
 section 4.1). As I said, I am not aware of any of the vendors using these =
sub-TVLs and it is easy to have a quick poll.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Regarding the paragraph=
 that got omitted, it is making it much more ambiguous than it used to. I w=
ould opt for clarifying the paragraph rather than removing it. If needed I =
can provide an updated paragraph. Section
 9 of RFC 8365 specifies how a VPN multicast route can be advertised with P=
MSI tunnel attribute and Encapsulation extended community and has been impl=
emented by many vendors.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Cheers,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Ali<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></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">Susan Hares &lt;sha=
res@ndzh.com&gt;<br>
<b>Date: </b>Friday, July 31, 2020 at 5:02 AM<br>
<b>To: </b>Cisco Employee &lt;sajassi@cisco.com&gt;, &quot;bess@ietf.org&qu=
ot; &lt;bess@ietf.org&gt;, &quot;idr@ietf.org&quot; &lt;idr@ietf.org&gt;<br=
>
<b>Cc: </b>&quot;'Hu, Jun (Nokia - US/Mountain View)'&quot; &lt;jun.hu@noki=
a.com&gt;<br>
<b>Subject: </b>RE: IPSec Tunnels and draft-sajassi-bess-secure-evpn </span=
><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">Ali:</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">It is wise to start with the RFC6514 and the draft-ietf-idr-tunnel-e=
ncapsulation draft..&nbsp;&nbsp;
</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">[WG chair hat on]
</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">The tunnel-encapsulation draft has passed general WG LC =96 so it is=
 inappropriate to call for the request to remove these sections.&nbsp; The =
WG LC that is currently running is whether to
 remove the =93AS=94 field from the tunnel endpoint field, and replace it w=
ith a reserved field..
</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">The implementation page is on:
</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><a href=3D"https://trac=
.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%20implementations">htt=
ps://trac.ietf.org/trac/idr/wiki/draft-ietf-idr-tunnel-encaps%20implementat=
ions</a><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">If you wish to provide =
information on the cisco implementation, you are welcome to add information=
 on the page.
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">I can call for an updat=
e to the page from vendors.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">[WG chair hat off[<o:p>=
</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">[Document shepherd hat =
on] <o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">The issue is during the=
 edits the text from RFC6514 from Eric Rosen was unclear.&nbsp; The text wa=
s:
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:12.0pt;margin-left:36.0pt;background:white;word-break:break-all"=
>
<span style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:b=
lack"><br>
<br>
<br>
</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;background:white;word-br=
eak:break-all">
<span style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:b=
lack">&nbsp;&nbsp;&nbsp;It has been suggested that it may sometimes be usef=
ul to attach a</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;background:white;word-br=
eak:break-all">
<span style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:b=
lack">&nbsp;&nbsp; Tunnel Encapsulation attribute to a BGP UPDATE message t=
hat is also</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;background:white;word-br=
eak:break-all">
<span style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:b=
lack">&nbsp;&nbsp; carrying a PMSI (Provider Multicast Service Interface) T=
unnel</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;background:white;word-br=
eak:break-all">
<span style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:b=
lack">&nbsp;&nbsp; attribute [<a href=3D"https://datatracker.ietf.org/doc/h=
tml/rfc6514"><span style=3D"color:#3D22B3">RFC6514</span></a>].&nbsp; If th=
e PMSI Tunnel attribute specifies an IP</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;background:white;word-br=
eak:break-all">
<span style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:b=
lack">&nbsp;&nbsp; tunnel, the Tunnel Encapsulation attribute could be used=
 to provide</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;background:white;word-br=
eak:break-all">
<span style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:b=
lack">&nbsp;&nbsp; additional information about the IP tunnel.&nbsp; The us=
age of the Tunnel</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;background:white;word-br=
eak:break-all">
<span style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:b=
lack">&nbsp;&nbsp; Encapsulation attribute in combination with the PMSI Tun=
nel attribute</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt;background:white;word-br=
eak:break-all">
<span style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:b=
lack">&nbsp;&nbsp; is outside the scope of this document.</span><o:p></o:p>=
</p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Since the text itself w=
as unclear what additional information could be provided, the authors remov=
ed it from the draft.
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">As we had not received =
any feedback about active RFC6514 interactions on the list.
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">[document shepherd off]=
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">If you have an implemen=
tation of the interaction between the RF6514 and tunnel encapsulation, it w=
ould be valuable to provide:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">a) &nbsp;either a draft=
 specifying the interaction you wish to IDR WG, or &nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">b) &nbsp;comments that =
could replace the original the original text.
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Since the IDR draft has=
 gone through multiple WG LC and a very complete review from Alvaro =96 so =
a quick response would be appreciated. &nbsp;&nbsp;IMHO a draft on the inte=
raction between RFC6514 and the tunnel-encapsulation
 draft =96 would be the best thing at this point.&nbsp; Let me know if you =
are interested in working on such a draft.
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Sue <o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#1=
F497D">&nbsp;</span><o:p></o:p></p>
<div>
<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:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif">From:</span></b><spa=
n style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif"> Ali=
 Sajassi (sajassi) [mailto:sajassi@cisco.com]
<br>
<b>Sent:</b> Friday, July 31, 2020 1:54 AM<br>
<b>To:</b> Susan Hares; bess@ietf.org; idr@ietf.org<br>
<b>Cc:</b> 'Hu, Jun (Nokia - US/Mountain View)'<br>
<b>Subject:</b> Re: IPSec Tunnels and draft-sajassi-bess-secure-evpn </span=
><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&lt;added idr@ietf.org&=
gt;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Sue,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Before getting to the d=
iscussions of the three IPsec proposals, there are some elements of draft-i=
etf-idr-tunnel-encaps-17.txt that I can see might have caused some confusio=
ns and I=92d like to get those sorted
 out first. <o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">The tunnel-encap draft =
specifies sub-tlv for VxLAN, VxLAN GDP, and NVGRE in sections 3.2.1, 3.2.2,=
 and 3.2.3. I am not aware of any vendor that has implemented these sub-tlv=
s because the info in these sub-tlv
 already exist in EVPN routes (e.g., MAC addresses, Ethernet Tags, etc.) wh=
ich they have implemented it. Therefore, all the vendors that I am aware of=
 use Extended Community &nbsp;defined in section 4.1&nbsp; along with EVPN =
routes to signal VxLAN and GENEVE tunnel types.
 Furthermore, I am not aware of anyone using NVGRE encap! So, as the first =
step, we should remove these three sections from the draft if there is no o=
bjection.
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Cheers,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Ali<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></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">Susan Hares &lt;sha=
res@ndzh.com&gt;<br>
<b>Date: </b>Tuesday, July 28, 2020 at 8:30 AM<br>
<b>To: </b>Cisco Employee &lt;sajassi@cisco.com&gt;, &quot;bess@ietf.org&qu=
ot; &lt;bess@ietf.org&gt;<br>
<b>Cc: </b>&quot;'Hu, Jun (Nokia - US/Mountain View)'&quot; &lt;jun.hu@noki=
a.com&gt;<br>
<b>Subject: </b>IPSec Tunnels and draft-sajassi-bess-secure-evpn </span><o:=
p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Ali and bess WG: <o:p><=
/o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">IDR has 3 proposals for=
 IPsec tunnels that impact draft-ietf-idr-tunnel-encaps-17.txt.&nbsp; As an=
 IDR co-chair/shepherd, &nbsp;I have been discussing these three drafts (Al=
i and two other authors sets) to try to find out
 if we can have one general solutions. &nbsp;&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">The discussion has been=
 very fruitful to point up BGP issues of interoperability, security, privac=
y, manageability, and scaling..&nbsp; For example, there is a lack of a cle=
ar specification between RFC6514 (PMSI tunnel
 attribute) and the tunnel-encaps draft that specifies how these drafts int=
eroperate. &nbsp;I suspect the bess and idr chairs will need to discuss if =
tunnel-encaps has to address this point.
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">I wrote up my ideas in =
draft-hares-idr-bgp-ipsec-analysis-00.txt so the authors could tell me what=
 I misunderstood.&nbsp; &nbsp;You=92ll find this draft stops half way.&nbsp=
; I have the rest of the draft written, but I wanted
 feedback from all the author teams before sending it out. <o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">After hearing some of t=
he details from the authors, I would like to sponsor an IDR interim so we c=
ould discuss these issues at length.&nbsp;&nbsp; If you think this is a goo=
d idea, please let me know.
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">One other thing=85 unfo=
rtunately, I scheduled a set of meetings for EDT time after IETF meetings t=
his week.&nbsp; &nbsp;Your next response will occur from 11-16 UTC on Wedne=
sday.
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Cheerily, Sue <o:p></o:=
p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
</div>
</div>
</div>
</div>
</body>
</html>

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From: Linda Dunbar <linda.dunbar@futurewei.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>, "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "'Najem, Basil'" <basil.najem@bell.ca>, "bess@ietf.org" <bess@ietf.org>
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Thread-Topic: [bess] Thought about "Application Routing" in draft-dunbar-bess-bgp-sdwan-usage
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/6uW45Hjkcns80Ssc2yVdxzwG16o>
Subject: Re: [bess] Thought about "Application Routing" in draft-dunbar-bess-bgp-sdwan-usage
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To: Linda Dunbar <linda.dunbar@futurewei.com>, "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "'Najem, Basil'" <basil.najem@bell.ca>, "bess@ietf.org" <bess@ietf.org>
Cc: "draft-dunbar-bess-bgp-sdwan-usage@ietf.org" <draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
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From: Joel Halpern Direct <jmh.direct@joelhalpern.com>
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Subject: Re: [bess] Thought about "Application Routing" in draft-dunbar-bess-bgp-sdwan-usage
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The way you are wording that third bullet, it looks like it is expecting 
the network (past the SD-WAN edges) to be looking for application 
identifiers in making the packet forwarding decisions.

Is what you are looking for:
   Selection of tunnels to be used for traffic subsets based on
   heuristic application identification to meet application
   oriented QoS goals?

Yours,
Joel

On 8/3/2020 12:35 PM, Linda Dunbar wrote:
> Adrian and Joel,
> Thank you very much for the suggestions.
> I have updated the description per your suggested wording:
> /Here are some key characteristics of â€œSDWANâ€� networks:/
> /-Â Â Â Â Â Â  Augment of transport, which refers to utilizing overlay paths 
> over different underlay networks. Very often there are multiple parallel 
> overlay paths between any two SDWAN edges, some of which are private 
> networks over which traffic can traverse with or without encryption, 
> others require encryption, e.g. over untrusted public networks. /
> /-Â Â Â Â Â Â  Enable direct Internet access from remote sites, instead 
> hauling all traffic to Corporate HQ for centralized policy control. /
> /-Â Â Â Â Â Â  Some traffic flows can be forwarded based on their application 
> identifiers instead of based on destination IP addresses. For example, 
> by placing the traffic flows onto specific overlay paths based on their 
> application IDs. /
> /-Â Â Â Â Â Â  The traffic flows forwarding can also be based on specific 
> performance criteria (e.g. packets delay, packet loos, jitter) to 
> provide better application performance by choosing the right underlay 
> that meets or exceeds the specified criteria./
> Thank you very much.
> Linda
> -----Original Message-----
> From: Joel M. Halpern <jmh@joelhalpern.com>
> Sent: Friday, July 31, 2020 6:35 AM
> To: adrian@olddog.co.uk; Linda Dunbar <linda.dunbar@futurewei.com>; 
> 'Najem, Basil' <basil.najem@bell.ca>; bess@ietf.org
> Cc: draft-dunbar-bess-bgp-sdwan-usage@ietf.org
> Subject: Re: [bess] Thought about "Application Routing" in 
> draft-dunbar-bess-bgp-sdwan-usage
> So Adrian does not feel like is a lone voice, let me agree publicly that 
> the terminology you are using is either wrong or more likely ambiguous 
> as to its purpose.Â  If you really want to use the term, define it 
> explicitly please.
> Yours,
> Joel
> On 7/31/2020 4:34 AM, Adrian Farrel wrote:
>> Hi Linda,
>> 
>> Thank you so much for continuing to try to accommodate me. Please 
>> consider this my last attempt to fix this unless someone else on the 
>> mailing list joins in to support my opinion.
>> 
>> I do not believe the term â€œapplication forwardingâ€� is either defined 
>> in the document or particularly meaningful. It is no better than 
>> â€œapplication routingâ€� in this respect.
>> 
>> I think that you are trying to refer to â€œindividual traffic flows 
>> associated with a specific applicationâ€� (although you may intend to 
>> refer to â€œindividual packetsâ€�). And you are either trying to describe 
>> how traffic is â€œclassifiedâ€� onto paths/tunnels (as in bullet 3) or 
>> trying to indicate how packets may be handled within the network 
>> (possibly bullet 4), or both.
>> 
>> You also have the use of an application identifier as a mechanism to 
>> classify traffic. If you go down that path you must discuss privacy 
>> and netneutrality even if all you have to say is that this function 
>> takes place within a private (enterprise) network where all users are 
>> assumed to be required to comply with the network operatorâ€™s usage rules.
>> 
>> Iâ€™ll stop now.
>> 
>> Once again, thanks for trying to make me happy ðŸ˜Š
>> 
>> Best,
>> 
>> Adrian
>> 
>> *From:*Linda Dunbar <linda.dunbar@futurewei.com <mailto:linda.dunbar@futurewei.com>>
>> *Sent:* 30 July 2020 23:34
>> *To:* Najem, Basil <basil.najem@bell.ca <mailto:basil.najem@bell.ca>>; adrian@olddog.co.uk 
> <mailto:adrian@olddog.co.uk>;
>> bess@ietf.org <mailto:bess@ietf.org>
>> *Cc:* draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> *Subject:* RE: Thought about "Application Routing" in 
>> draft-dunbar-bess-bgp-sdwan-usage
>> 
>> Adrian,
>> 
>> Thank you very much for the comments and suggestions.
>> 
>> Per your suggestions, we have changed the wording to the following. Do 
>> you think it is clear?
>> 
>> Here are some key characteristics of â€œSDWANâ€� networks:
>> 
>> -Augment of transport, which refers to utilizing overlay paths over 
>> different underlay networks. Very often there are multiple parallel 
>> overlay paths between any two SDWAN edges, some of which are private 
>> networks over which traffic can traverse with or without encryption, 
>> others require encryption, e.g. over untrusted public networks.
>> 
>> -Enable direct Internet access from remote sites, instead hauling all 
>> traffic to Corporate HQ for centralized policy control.
>> 
>> -Some traffic can be forwarded based on their application IDs instead 
>> of based on destination IP addresses. For example, placing traffic 
>> onto specific overlay paths based on their application IDs.
>> 
>> -The Application forwarding can also be based on specific performance 
>> criteria (e.g. packets delay, packet loos, jitter) to provide better 
>> application performance by choosing the right underlay that meets or 
>> exceeds the specified criteria.
>> 
>> If it is not clear, can you help to wordsmith it?
>> 
>> Linda Dunbar
>> 
>> *From:*Najem, Basil <basil.najem@bell.ca <mailto:basil.najem@bell.ca 
> <mailto:basil.najem@bell.ca <mailto:basil.najem@bell.ca>>>
>> *Sent:* Tuesday, July 28, 2020 9:46 AM
>> *To:* adrian@olddog.co.uk <mailto:adrian@olddog.co.uk> 
> <mailto:adrian@olddog.co.uk>; Linda Dunbar
>> <linda.dunbar@futurewei.com <mailto:linda.dunbar@futurewei.com 
> <mailto:linda.dunbar@futurewei.com <mailto:linda.dunbar@futurewei.com>>>;
>> bess@ietf.org <mailto:bess@ietf.org> <mailto:bess@ietf.org>
>> *Cc:* draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> *Subject:* RE: Thought about "Application Routing" in 
>> draft-dunbar-bess-bgp-sdwan-usage
>> 
>> Hi Adrian;
>> 
>> Given the context in the document, Iâ€™d revert back to the original 
>> paragraph (my proposed text in the thread) and change â€œroute/routedâ€� 
>> to â€œforward/forwardedâ€�.
>> 
>> Regards;
>> 
>> Basil
>> 
>> *From:*Adrian Farrel <adrian@olddog.co.uk 
>> <mailto:adrian@olddog.co.uk>>
>> *Sent:* July-28-20 10:07 AM
>> *To:* Najem, Basil <basil.najem@bell.ca <mailto:basil.najem@bell.ca 
> <mailto:basil.najem@bell.ca <mailto:basil.najem@bell.ca>>>;
>> 'Linda Dunbar' <linda.dunbar@futurewei.com 
>> <mailto:linda.dunbar@futurewei.com>>; bess@ietf.org <mailto:bess@ietf.org>
>> <mailto:bess@ietf.org>
>> *Cc:* draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> *Subject:* [EXT]RE: Thought about "Application Routing" in 
>> draft-dunbar-bess-bgp-sdwan-usage
>> 
>> The issue I am trying to get at is that the text you have in the draft 
>> is unclear and probably going to explode.
>> 
>>Â Â  * We have an approximate solution for that
>> 
>> The secondary issue is whether you are talking about 
>> routing/forwarding within the network, or placing the traffic onto tunnels at the edge.
>> 
>>Â Â  * You are pretty clear on what you mean, and I am fine with that since
>>Â Â Â Â  it fits with my understanding of VPN.
>>Â Â  * Possibly Linda is thinking about how those tunnels are maintained
>>Â Â Â Â  and operated to meet the service levels that they offer. That would
>>Â Â Â Â  be (I think) out of scope for a BGP VPN
>> 
>> Maybe we can polish the paragraph in question to becomeâ€¦
>> 
>> Better user experience can be provided by placing traffic flows for an 
>> application onto tunnels over an underlay network that meet or exceed 
>> the specified performance criteria (e.g., packets delay, packet lose,
>> jitter) for those traffic flows.
>> 
>> Cheers,
>> 
>> Adrian
>> 
>> *From:*Najem, Basil <basil.najem@bell.ca <mailto:basil.najem@bell.ca 
> <mailto:basil.najem@bell.ca <mailto:basil.najem@bell.ca>>>
>> *Sent:* 28 July 2020 14:28
>> *To:* adrian@olddog.co.uk <mailto:adrian@olddog.co.uk> 
> <mailto:adrian@olddog.co.uk>; 'Linda Dunbar'
>> <linda.dunbar@futurewei.com <mailto:linda.dunbar@futurewei.com 
> <mailto:linda.dunbar@futurewei.com <mailto:linda.dunbar@futurewei.com>>>;
>> bess@ietf.org <mailto:bess@ietf.org> <mailto:bess@ietf.org>
>> *Cc:* draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> *Subject:* RE: Thought about "Application Routing" in 
>> draft-dunbar-bess-bgp-sdwan-usage
>> 
>> Letâ€™s get back to what SD-WAN is doing: it can steer/forward the 
>> application traffic based on specified performance criteria value 
>> requirement. This criteria is set by the subscriber (user) to ensure a 
>> better experience (by choosing the best tunnel over an underlay). Not 
>> sure whatâ€™s the issue here Adrian? Can we capture this statement as 
>> per your suggestion and remove the word â€œrouteâ€� (or routed) and 
>> replace it with â€œforwardâ€� (or forwarded)?
>> 
>> Regards;
>> 
>> Basil
>> 
>> *From:*Adrian Farrel <adrian@olddog.co.uk 
>> <mailto:adrian@olddog.co.uk>>
>> *Sent:* July-28-20 9:19 AM
>> *To:* 'Linda Dunbar' <linda.dunbar@futurewei.com 
>> <mailto:linda.dunbar@futurewei.com>>; Najem, Basil
>> <basil.najem@bell.ca <mailto:basil.najem@bell.ca 
> <mailto:basil.najem@bell.ca <mailto:basil.najem@bell.ca>>>; 
> bess@ietf.org <mailto:bess@ietf.org>
>> <mailto:bess@ietf.org>
>> *Cc:* draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> *Subject:* [EXT]RE: Thought about "Application Routing" in 
>> draft-dunbar-bess-bgp-sdwan-usage
>> 
>> Thanks to both Linda and Basil,
>> 
>> My response is a little unthought as I am currently following two 
>> simultaneous sessions (sorry about that), but it seems to me that the 
>> answers from the two of you seem to be slightly at odds.
>> 
>> Basil is talking about steering whole traffic flows onto tunnels to be 
>> carried over the network; Linda is talking about routing individual 
>> packets within the network.
>> 
>> I would still caution you to avoid tying too tightly to the term 
>> â€œapplicationâ€�. A single application may generate multiple flows with 
>> different performance criteria and you will treat the flows differently.
>> Conversely, two applications may generate flows that have identical 
>> performance criteria.
>> 
>> Thanks,
>> 
>> Adrian
>> 
>> *From:*Linda Dunbar <linda.dunbar@futurewei.com 
>> <mailto:linda.dunbar@futurewei.com>>
>> *Sent:* 28 July 2020 14:05
>> *To:* Najem, Basil <basil.najem@bell.ca <mailto:basil.najem@bell.ca 
> <mailto:basil.najem@bell.ca <mailto:basil.najem@bell.ca>>>;
>> adrian@olddog.co.uk <mailto:adrian@olddog.co.uk> 
> <mailto:adrian@olddog.co.uk>; bess@ietf.org <mailto:bess@ietf.org>
>> <mailto:bess@ietf.org>
>> *Cc:* draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> *Subject:* RE: Thought about "Application Routing" in 
>> draft-dunbar-bess-bgp-sdwan-usage
>> 
>> Adrian,
>> 
>> You said:
>> 
>> /As will be seen from the Application Aware Networking (APN) effort, 
>> the concept of traffic flows being routed according to the identity of 
>> the application is made complicated by various privacy and security 
>> concerns, not to mention issues of registering application 
>> identities./
>> 
>> The "Application" doesn't necessary mean all the bits in the payload. 
>> The "Application" can be any criteria that Client has indicated to 
>> Network Operators, for example the IPsec SA header bits, the TCP/UDP 
>> port number, the Source Addresses, etc.
>> 
>> The network will not alter the forwarding behavior unless there is the 
>> request from the client to inform the network to forward their traffic 
>> based on its provided criteria.
>> 
>> This draft, which was written 2 years ago, is indeed to show that BGP 
>> can be effectively used to â€œ/do something similar to APN: that is, to 
>> classify the service that a particular application-sourced flow wants 
>> to receive from the networkâ€�./
>> 
>> Since SDWAN is over different types of underlay networks, with 
>> different performance and security aspects, clients may want their 
>> specific traffic to traverse specific underlay networks, or specific peers.
>> 
>> Yes, indeed that the goal is to â€œ the packets are 'coloured' for 
>> routing and treatment in the network.â€�
>> 
>> There is another draft in IDR to describe the encoding â€œColorâ€� or 
>> â€œIPsec SA IDâ€�:
>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdata
>> tracker.ietf.org%2Fdoc%2Fdraft-dunbar-idr-sdwan-edge-discovery%2F&amp;
>> data=02%7C01%7Clinda.dunbar%40futurewei.com%7C9eec1ed693124518fec508d8
>> 3545d5a4%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C6373179213533748
>> 40&amp;sdata=ljuFqIHRJbFcAox2pqZgWSQN6jODGvfT9%2Bn44PR9ta0%3D&amp;rese
>> rved=0 
>> <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdat
>> atracker.ietf.org%2Fdoc%2Fdraft-dunbar-idr-sdwan-edge-discovery%2F&amp
>> ;data=02%7C01%7Clinda.dunbar%40futurewei.com%7C9eec1ed693124518fec508d
>> 83545d5a4%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637317921353374
>> 840&amp;sdata=ljuFqIHRJbFcAox2pqZgWSQN6jODGvfT9%2Bn44PR9ta0%3D&amp;res
>> erved=0>
>> 
>> Welcome your comments to that draft.
>> 
>> I will attend the APN side meeting on Thurs to understand more.
>> 
>> Linda Dunbar
>> 
>> -----Original Message-----
>> From: Najem, Basil <basil.najem@bell.ca <mailto:basil.najem@bell.ca 
> <mailto:basil.najem@bell.ca <mailto:basil.najem@bell.ca>>>
>> Sent: Tuesday, July 28, 2020 7:10 AM
>> To: adrian@olddog.co.uk <mailto:adrian@olddog.co.uk> 
> <mailto:adrian@olddog.co.uk>; bess@ietf.org <mailto:bess@ietf.org>
>> <mailto:bess@ietf.org>
>> Cc: draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> Subject: RE: Thought about "Application Routing" in 
>> draft-dunbar-bess-bgp-sdwan-usage
>> 
>> Thanks Adrian for your comment.
>> 
>> How about changing the paragraph to something like:
>> 
>> "The application can be routed based on specific performance criteria 
>> (e.g. packets delay, packet lose, jitter) to provide a better 
>> experience by choosing a tunnel over an underlay that meets or exceeds 
>> the specified performance criteria threshold for that application"
>> 
>> Regards;
>> 
>> Basil
>> 
>> -----Original Message-----
>> 
>> From: Adrian Farrel <adrian@olddog.co.uk <mailto:adrian@olddog.co.uk 
> <mailto:adrian@olddog.co.uk <mailto:adrian@olddog.co.uk>>>
>> 
>> Sent: July-28-20 8:01 AM
>> 
>> To: bess@ietf.org <mailto:bess@ietf.org> <mailto:bess@ietf.org>
>> 
>> Cc: draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> 
>> Subject: [EXT]Thought about "Application Routing" in 
>> draft-dunbar-bess-bgp-sdwan-usage
>> 
>> Hi,
>> 
>> As Linda noted in her agenda slot today, 
>> draft-dunbar-bess-bgp-sdwan-usage version 08 introduced a new 
>> paragraph in the Introduction that says:
>> 
>>Â  Â Â Â  - The Application Routing can also be based on specific
>> 
>>Â  Â Â Â Â Â Â  performance criteria (e.g. packets delay, packet loos, jitter)
>> 
>>Â  Â Â Â Â Â Â  to provide better application performance by choosing the 
>> right
>> 
>>Â  Â Â Â Â Â Â  underlay that meets or exceeds the specified criteria.
>> 
>> Firstly, s/loos/loss/ ðŸ˜Š
>> 
>> But I am concerned by the concept of "application routing" and I note 
>> that the term is not used elsewhere in the document nor is the concept 
>> expanded upon.
>> 
>> As will be seen from the Application Aware Networking (APN) effort, 
>> the concept of traffic flows being routed according to the identity of 
>> the application is made complicated by various privacy and security 
>> concerns, not to mention issues of registering application identities.
>> 
>> Fortunately, I suspect that this draft wants to do something similar 
>> to
>> APN: that is, to classify the service that a particular 
>> application-sourced flow wants to receive from the network. This may 
>> be considerably more complex than DSCP, but the concept is the same 
>> that either a tunnel/pipe/flow is negotiated and established for use 
>> by the application, or the packets are 'coloured' for routing and 
>> treatment in the network.
>> 
>> I would suggest two things:
>> 
>> 1. Be a lot more clear about what is meant by "application routing" 
>> possibly even using a different term 2. Have a look at the APN work - 
>> side meeting on Thursday; see
>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgith
>> ub.com%2FAPN-Community%2FIETF108-Side-Meeting-APN&amp;data=02%7C01%7Cl
>> inda.dunbar%40futurewei.com%7C9eec1ed693124518fec508d83545d5a4%7C0fee8
>> ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637317921353374840&amp;sdata=J0U
>> SmGqeVz9pR5MmJRoOdTZFrmmJ8JiSFKAz4wuNgNs%3D&amp;reserved=0
>> <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit
>> hub.com%2FAPN-Community%2FIETF108-Side-Meeting-APN&amp;data=02%7C01%7C
>> linda.dunbar%40futurewei.com%7C9eec1ed693124518fec508d83545d5a4%7C0fee
>> 8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637317921353374840&amp;sdata=J0
>> USmGqeVz9pR5MmJRoOdTZFrmmJ8JiSFKAz4wuNgNs%3D&amp;reserved=0>
>> for all the details
>> 
>> Best,
>> 
>> Adrian
>> 
>> ----------------------------------------------------------------------
>> --------
>> 
>> External Email: Please use caution when opening links and attachments 
>> / Courriel externe: Soyez prudent avec les liens et documents joints
>> 
>> ----------------------------------------------------------------------
>> --
>> 
>> */External Email:/*/Please use caution when opening links and 
>> attachments / /*/Courriel externe:/*/Soyez prudent avec les liens et 
>> documents joints /
>> 
>> ----------------------------------------------------------------------
>> --
>> 
>> */External Email:/*/Please use caution when opening links and 
>> attachments / /*/Courriel externe:/*/Soyez prudent avec les liens et 
>> documents joints /
>> 
>> 
>> _______________________________________________
>> BESS mailing list
>> BESS@ietf.org <mailto:BESS@ietf.org>
>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.
>> ietf.org%2Fmailman%2Flistinfo%2Fbess&amp;data=02%7C01%7Clinda.dunbar%4
>> 0futurewei.com%7C9eec1ed693124518fec508d83545d5a4%7C0fee8ff2a3b240189c
>> 753a1d5591fedc%7C1%7C0%7C637317921353374840&amp;sdata=6XAaNduwfa3MmKOC
>> u8eHydfaNzI%2F1dfgjfrBZiRXL4E%3D&amp;reserved=0
>> 


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From: Linda Dunbar <linda.dunbar@futurewei.com>
To: Joel Halpern Direct <jmh.direct@joelhalpern.com>, "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "'Najem, Basil'" <basil.najem@bell.ca>, "bess@ietf.org" <bess@ietf.org>
CC: "draft-dunbar-bess-bgp-sdwan-usage@ietf.org" <draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
Thread-Topic: [bess] Thought about "Application Routing" in draft-dunbar-bess-bgp-sdwan-usage
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/F_aqA0r2-sMWDvMM0rCTJbgvRWU>
Subject: Re: [bess] Thought about "Application Routing" in draft-dunbar-bess-bgp-sdwan-usage
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To: Linda Dunbar <linda.dunbar@futurewei.com>, "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "'Najem, Basil'" <basil.najem@bell.ca>, "bess@ietf.org" <bess@ietf.org>
Cc: "draft-dunbar-bess-bgp-sdwan-usage@ietf.org" <draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
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From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Subject: Re: [bess] Thought about "Application Routing" in draft-dunbar-bess-bgp-sdwan-usage
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This wording is better.
there are still two aspects where I think we can be clearer.
First, referring to generic packet forwarding and only later saying "we 
mean tunnel selection" is still prone to confusing readers and prone to 
confusing discussions of our intent later when folks use this document 
for other work.
Second, it would be good if we could avoid wording that implies that 
application identifier is a field in the packet.  Some sort of wording 
that refers to it as a process performed by the SD-WAN edge is one way 
to improve it.   I tried suggesting it was heuristic (which it is) as a 
way to clarify it.  I am sure there are other ways.

Yours,
Joel

On 8/3/2020 1:08 PM, Linda Dunbar wrote:
> Joel,
> How about this statement?
> -Â Â Â Â Â  Some traffic flows can be forwarded based on their application 
> identifiers instead of based on destination IP addresses, by the edge 
> nodes placing the traffic flows onto specific overlay paths based on 
> their application requirement.
> It is more than " application oriented QoS goals". Some applications are 
> restricted to certain nodes. So regardless of the destination, their 
> traffic are placed in the Overlay path between those "certain nodes".
> Linda
> -----Original Message-----
> From: Joel Halpern Direct <jmh.direct@joelhalpern.com>
> Sent: Monday, August 3, 2020 11:52 AM
> To: Linda Dunbar <linda.dunbar@futurewei.com>; adrian@olddog.co.uk; 
> 'Najem, Basil' <basil.najem@bell.ca>; bess@ietf.org
> Cc: draft-dunbar-bess-bgp-sdwan-usage@ietf.org
> Subject: Re: [bess] Thought about "Application Routing" in 
> draft-dunbar-bess-bgp-sdwan-usage
> The way you are wording that third bullet, it looks like it is expecting 
> the network (past the SD-WAN edges) to be looking for application 
> identifiers in making the packet forwarding decisions.
> Is what you are looking for:
>  Â Â  Selection of tunnels to be used for traffic subsets based on
>  Â Â  heuristic application identification to meet application
>  Â Â  oriented QoS goals?
> Yours,
> Joel
> On 8/3/2020 12:35 PM, Linda Dunbar wrote:
>> Adrian and Joel,
>> Thank you very much for the suggestions.
>> I have updated the description per your suggested wording:
>> /Here are some key characteristics of â€œSDWANâ€� networks:/
>> /-Â Â Â Â Â Â  Augment of transport, which refers to utilizing overlay paths 
>> over different underlay networks. Very often there are multiple 
>> parallel overlay paths between any two SDWAN edges, some of which are 
>> private networks over which traffic can traverse with or without 
>> encryption, others require encryption, e.g. over untrusted public 
>> networks. /
>> /-Â Â Â Â Â Â  Enable direct Internet access from remote sites, instead 
>> hauling all traffic to Corporate HQ for centralized policy control. /
>> /-Â Â Â Â Â Â  Some traffic flows can be forwarded based on their 
>> application identifiers instead of based on destination IP addresses. 
>> For example, by placing the traffic flows onto specific overlay paths 
>> based on their application IDs. /
>> /-Â Â Â Â Â Â  The traffic flows forwarding can also be based on specific 
>> performance criteria (e.g. packets delay, packet loos, jitter) to 
>> provide better application performance by choosing the right underlay 
>> that meets or exceeds the specified criteria./ Thank you very much.
>> Linda
>> -----Original Message-----
>> From: Joel M. Halpern <jmh@joelhalpern.com <mailto:jmh@joelhalpern.com>>
>> Sent: Friday, July 31, 2020 6:35 AM
>> To: adrian@olddog.co.uk <mailto:adrian@olddog.co.uk>; Linda Dunbar 
> <linda.dunbar@futurewei.com <mailto:linda.dunbar@futurewei.com>>;
>> 'Najem, Basil' <basil.najem@bell.ca <mailto:basil.najem@bell.ca>>; bess@ietf.org 
> <mailto:bess@ietf.org>
>> Cc: draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> Subject: Re: [bess] Thought about "Application Routing" in 
>> draft-dunbar-bess-bgp-sdwan-usage So Adrian does not feel like is a 
>> lone voice, let me agree publicly that the terminology you are using 
>> is either wrong or more likely ambiguous as to its purpose.Â  If you 
>> really want to use the term, define it explicitly please.
>> Yours,
>> Joel
>> On 7/31/2020 4:34 AM, Adrian Farrel wrote:
>>> Hi Linda,
>>> 
>>> Thank you so much for continuing to try to accommodate me. Please 
>>> consider this my last attempt to fix this unless someone else on the 
>>> mailing list joins in to support my opinion.
>>> 
>>> I do not believe the term â€œapplication forwardingâ€� is either defined 
>>> in the document or particularly meaningful. It is no better than 
>>> â€œapplication routingâ€� in this respect.
>>> 
>>> I think that you are trying to refer to â€œindividual traffic flows 
>>> associated with a specific applicationâ€� (although you may intend to 
>>> refer to â€œindividual packetsâ€�). And you are either trying to describe 
>>> how traffic is â€œclassifiedâ€� onto paths/tunnels (as in bullet 3) or 
>>> trying to indicate how packets may be handled within the network 
>>> (possibly bullet 4), or both.
>>> 
>>> You also have the use of an application identifier as a mechanism to 
>>> classify traffic. If you go down that path you must discuss privacy 
>>> and netneutrality even if all you have to say is that this function 
>>> takes place within a private (enterprise) network where all users are 
>>> assumed to be required to comply with the network operatorâ€™s usage rules.
>>> 
>>> Iâ€™ll stop now.
>>> 
>>> Once again, thanks for trying to make me happy ðŸ˜Š
>>> 
>>> Best,
>>> 
>>> Adrian
>>> 
>>> *From:*Linda Dunbar <linda.dunbar@futurewei.com 
>>> <mailto:linda.dunbar@futurewei.com>>
>>> *Sent:* 30 July 2020 23:34
>>> *To:* Najem, Basil <basil.najem@bell.ca 
>>> <mailto:basil.najem@bell.ca>>; adrian@olddog.co.uk 
> <mailto:adrian@olddog.co.uk>
>> <mailto:adrian@olddog.co.uk>;
>>> bess@ietf.org <mailto:bess@ietf.org> <mailto:bess@ietf.org>
>>> *Cc:* draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>>> *Subject:* RE: Thought about "Application Routing" in 
>>> draft-dunbar-bess-bgp-sdwan-usage
>>> 
>>> Adrian,
>>> 
>>> Thank you very much for the comments and suggestions.
>>> 
>>> Per your suggestions, we have changed the wording to the following. 
>>> Do you think it is clear?
>>> 
>>> Here are some key characteristics of â€œSDWANâ€� networks:
>>> 
>>> -Augment of transport, which refers to utilizing overlay paths over 
>>> different underlay networks. Very often there are multiple parallel 
>>> overlay paths between any two SDWAN edges, some of which are private 
>>> networks over which traffic can traverse with or without encryption, 
>>> others require encryption, e.g. over untrusted public networks.
>>> 
>>> -Enable direct Internet access from remote sites, instead hauling all 
>>> traffic to Corporate HQ for centralized policy control.
>>> 
>>> -Some traffic can be forwarded based on their application IDs instead 
>>> of based on destination IP addresses. For example, placing traffic 
>>> onto specific overlay paths based on their application IDs.
>>> 
>>> -The Application forwarding can also be based on specific performance 
>>> criteria (e.g. packets delay, packet loos, jitter) to provide better 
>>> application performance by choosing the right underlay that meets or 
>>> exceeds the specified criteria.
>>> 
>>> If it is not clear, can you help to wordsmith it?
>>> 
>>> Linda Dunbar
>>> 
>>> *From:*Najem, Basil <basil.najem@bell.ca <mailto:basil.najem@bell.ca
>> <mailto:basil.najem@bell.ca <mailto:basil.najem@bell.ca>>>
>>> *Sent:* Tuesday, July 28, 2020 9:46 AM
>>> *To:* adrian@olddog.co.uk <mailto:adrian@olddog.co.uk> 
> <mailto:adrian@olddog.co.uk>
>> <mailto:adrian@olddog.co.uk>; Linda Dunbar
>>> <linda.dunbar@futurewei.com <mailto:linda.dunbar@futurewei.com
>> <mailto:linda.dunbar@futurewei.com
>> <mailto:linda.dunbar@futurewei.com>>>;
>>> bess@ietf.org <mailto:bess@ietf.org> <mailto:bess@ietf.org> 
> <mailto:bess@ietf.org>
>>> *Cc:* draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>>> *Subject:* RE: Thought about "Application Routing" in 
>>> draft-dunbar-bess-bgp-sdwan-usage
>>> 
>>> Hi Adrian;
>>> 
>>> Given the context in the document, Iâ€™d revert back to the original 
>>> paragraph (my proposed text in the thread) and change â€œroute/routedâ€�
>>> to â€œforward/forwardedâ€�.
>>> 
>>> Regards;
>>> 
>>> Basil
>>> 
>>> *From:*Adrian Farrel <adrian@olddog.co.uk 
>>> <mailto:adrian@olddog.co.uk>>
>>> *Sent:* July-28-20 10:07 AM
>>> *To:* Najem, Basil <basil.najem@bell.ca <mailto:basil.najem@bell.ca
>> <mailto:basil.najem@bell.ca <mailto:basil.najem@bell.ca>>>;
>>> 'Linda Dunbar' <linda.dunbar@futurewei.com 
>>> <mailto:linda.dunbar@futurewei.com>>; bess@ietf.org <mailto:bess@ietf.org>
>>> <mailto:bess@ietf.org> <mailto:bess@ietf.org>
>>> *Cc:* draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>>> *Subject:* [EXT]RE: Thought about "Application Routing" in 
>>> draft-dunbar-bess-bgp-sdwan-usage
>>> 
>>> The issue I am trying to get at is that the text you have in the 
>>> draft is unclear and probably going to explode.
>>> 
>>>Â Â  * We have an approximate solution for that
>>> 
>>> The secondary issue is whether you are talking about 
>>> routing/forwarding within the network, or placing the traffic onto tunnels at the edge.
>>> 
>>>Â Â  * You are pretty clear on what you mean, and I am fine with that 
>>>since
>>>Â Â Â Â  it fits with my understanding of VPN.
>>>Â Â  * Possibly Linda is thinking about how those tunnels are maintained
>>>Â Â Â Â  and operated to meet the service levels that they offer. That 
>>>would
>>>Â Â Â Â  be (I think) out of scope for a BGP VPN
>>> 
>>> Maybe we can polish the paragraph in question to becomeâ€¦
>>> 
>>> Better user experience can be provided by placing traffic flows for 
>>> an application onto tunnels over an underlay network that meet or 
>>> exceed the specified performance criteria (e.g., packets delay, 
>>> packet lose,
>>> jitter) for those traffic flows.
>>> 
>>> Cheers,
>>> 
>>> Adrian
>>> 
>>> *From:*Najem, Basil <basil.najem@bell.ca <mailto:basil.najem@bell.ca
>> <mailto:basil.najem@bell.ca <mailto:basil.najem@bell.ca>>>
>>> *Sent:* 28 July 2020 14:28
>>> *To:* adrian@olddog.co.uk <mailto:adrian@olddog.co.uk> 
> <mailto:adrian@olddog.co.uk>
>> <mailto:adrian@olddog.co.uk>; 'Linda Dunbar'
>>> <linda.dunbar@futurewei.com <mailto:linda.dunbar@futurewei.com
>> <mailto:linda.dunbar@futurewei.com
>> <mailto:linda.dunbar@futurewei.com>>>;
>>> bess@ietf.org <mailto:bess@ietf.org> <mailto:bess@ietf.org> 
> <mailto:bess@ietf.org>
>>> *Cc:* draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>>> *Subject:* RE: Thought about "Application Routing" in 
>>> draft-dunbar-bess-bgp-sdwan-usage
>>> 
>>> Letâ€™s get back to what SD-WAN is doing: it can steer/forward the 
>>> application traffic based on specified performance criteria value 
>>> requirement. This criteria is set by the subscriber (user) to ensure 
>>> a better experience (by choosing the best tunnel over an underlay). 
>>> Not sure whatâ€™s the issue here Adrian? Can we capture this statement 
>>> as per your suggestion and remove the word â€œrouteâ€� (or routed) and 
>>> replace it with â€œforwardâ€� (or forwarded)?
>>> 
>>> Regards;
>>> 
>>> Basil
>>> 
>>> *From:*Adrian Farrel <adrian@olddog.co.uk 
>>> <mailto:adrian@olddog.co.uk>>
>>> *Sent:* July-28-20 9:19 AM
>>> *To:* 'Linda Dunbar' <linda.dunbar@futurewei.com 
>>> <mailto:linda.dunbar@futurewei.com>>; Najem, Basil
>>> <basil.najem@bell.ca <mailto:basil.najem@bell.ca
>> <mailto:basil.najem@bell.ca <mailto:basil.najem@bell.ca>>>;
>> bess@ietf.org <mailto:bess@ietf.org> <mailto:bess@ietf.org>
>>> <mailto:bess@ietf.org>
>>> *Cc:* draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>>> *Subject:* [EXT]RE: Thought about "Application Routing" in 
>>> draft-dunbar-bess-bgp-sdwan-usage
>>> 
>>> Thanks to both Linda and Basil,
>>> 
>>> My response is a little unthought as I am currently following two 
>>> simultaneous sessions (sorry about that), but it seems to me that the 
>>> answers from the two of you seem to be slightly at odds.
>>> 
>>> Basil is talking about steering whole traffic flows onto tunnels to 
>>> be carried over the network; Linda is talking about routing 
>>> individual packets within the network.
>>> 
>>> I would still caution you to avoid tying too tightly to the term 
>>> â€œapplicationâ€�. A single application may generate multiple flows with 
>>> different performance criteria and you will treat the flows differently.
>>> Conversely, two applications may generate flows that have identical 
>>> performance criteria.
>>> 
>>> Thanks,
>>> 
>>> Adrian
>>> 
>>> *From:*Linda Dunbar <linda.dunbar@futurewei.com 
>>> <mailto:linda.dunbar@futurewei.com>>
>>> *Sent:* 28 July 2020 14:05
>>> *To:* Najem, Basil <basil.najem@bell.ca <mailto:basil.najem@bell.ca
>> <mailto:basil.najem@bell.ca <mailto:basil.najem@bell.ca>>>;
>>> adrian@olddog.co.uk <mailto:adrian@olddog.co.uk> 
> <mailto:adrian@olddog.co.uk>
>> <mailto:adrian@olddog.co.uk>; bess@ietf.org <mailto:bess@ietf.org> 
> <mailto:bess@ietf.org>
>>> <mailto:bess@ietf.org>
>>> *Cc:* draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>>> *Subject:* RE: Thought about "Application Routing" in 
>>> draft-dunbar-bess-bgp-sdwan-usage
>>> 
>>> Adrian,
>>> 
>>> You said:
>>> 
>>> /As will be seen from the Application Aware Networking (APN) effort, 
>>> the concept of traffic flows being routed according to the identity 
>>> of the application is made complicated by various privacy and 
>>> security concerns, not to mention issues of registering application 
>>> identities./
>>> 
>>> The "Application" doesn't necessary mean all the bits in the payload. 
>>> The "Application" can be any criteria that Client has indicated to 
>>> Network Operators, for example the IPsec SA header bits, the TCP/UDP 
>>> port number, the Source Addresses, etc.
>>> 
>>> The network will not alter the forwarding behavior unless there is 
>>> the request from the client to inform the network to forward their 
>>> traffic based on its provided criteria.
>>> 
>>> This draft, which was written 2 years ago, is indeed to show that BGP 
>>> can be effectively used to â€œ/do something similar to APN: that is, to 
>>> classify the service that a particular application-sourced flow wants 
>>> to receive from the networkâ€�./
>>> 
>>> Since SDWAN is over different types of underlay networks, with 
>>> different performance and security aspects, clients may want their 
>>> specific traffic to traverse specific underlay networks, or specific peers.
>>> 
>>> Yes, indeed that the goal is to â€œ the packets are 'coloured' for 
>>> routing and treatment in the network.â€�
>>> 
>>> There is another draft in IDR to describe the encoding â€œColorâ€� or 
>>> â€œIPsec SA IDâ€�:
>>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdat
>>> a 
>>> tracker.ietf.org%2Fdoc%2Fdraft-dunbar-idr-sdwan-edge-discovery%2F&amp
>>> ;
>>> data=02%7C01%7Clinda.dunbar%40futurewei.com%7C9eec1ed693124518fec508d
>>> 8
>>> 3545d5a4%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637317921353374
>>> 8 
>>> 40&amp;sdata=ljuFqIHRJbFcAox2pqZgWSQN6jODGvfT9%2Bn44PR9ta0%3D&amp;res
>>> e
>>> rved=0
>>> <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fda
>>> t 
>>> atracker.ietf.org%2Fdoc%2Fdraft-dunbar-idr-sdwan-edge-discovery%2F&am
>>> p 
>>> ;data=02%7C01%7Clinda.dunbar%40futurewei.com%7C9eec1ed693124518fec508
>>> d
>>> 83545d5a4%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C63731792135337
>>> 4 
>>> 840&amp;sdata=ljuFqIHRJbFcAox2pqZgWSQN6jODGvfT9%2Bn44PR9ta0%3D&amp;re
>>> s
>>> erved=0>
>>> 
>>> Welcome your comments to that draft.
>>> 
>>> I will attend the APN side meeting on Thurs to understand more.
>>> 
>>> Linda Dunbar
>>> 
>>> -----Original Message-----
>>> From: Najem, Basil <basil.najem@bell.ca <mailto:basil.najem@bell.ca
>> <mailto:basil.najem@bell.ca <mailto:basil.najem@bell.ca>>>
>>> Sent: Tuesday, July 28, 2020 7:10 AM
>>> To: adrian@olddog.co.uk <mailto:adrian@olddog.co.uk> 
> <mailto:adrian@olddog.co.uk>
>> <mailto:adrian@olddog.co.uk>; bess@ietf.org <mailto:bess@ietf.org> 
> <mailto:bess@ietf.org>
>>> <mailto:bess@ietf.org>
>>> Cc: draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>>> Subject: RE: Thought about "Application Routing" in 
>>> draft-dunbar-bess-bgp-sdwan-usage
>>> 
>>> Thanks Adrian for your comment.
>>> 
>>> How about changing the paragraph to something like:
>>> 
>>> "The application can be routed based on specific performance criteria 
>>> (e.g. packets delay, packet lose, jitter) to provide a better 
>>> experience by choosing a tunnel over an underlay that meets or 
>>> exceeds the specified performance criteria threshold for that application"
>>> 
>>> Regards;
>>> 
>>> Basil
>>> 
>>> -----Original Message-----
>>> 
>>> From: Adrian Farrel <adrian@olddog.co.uk <mailto:adrian@olddog.co.uk
>> <mailto:adrian@olddog.co.uk <mailto:adrian@olddog.co.uk>>>
>>> 
>>> Sent: July-28-20 8:01 AM
>>> 
>>> To: bess@ietf.org <mailto:bess@ietf.org> <mailto:bess@ietf.org> 
> <mailto:bess@ietf.org>
>>> 
>>> Cc: draft-dunbar-bess-bgp-sdwan-usage@ietf.org 
> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>>> <mailto:draft-dunbar-bess-bgp-sdwan-usage@ietf.org>
>>> 
>>> Subject: [EXT]Thought about "Application Routing" in 
>>> draft-dunbar-bess-bgp-sdwan-usage
>>> 
>>> Hi,
>>> 
>>> As Linda noted in her agenda slot today, 
>>> draft-dunbar-bess-bgp-sdwan-usage version 08 introduced a new 
>>> paragraph in the Introduction that says:
>>> 
>>>Â  Â Â Â  - The Application Routing can also be based on specific
>>> 
>>>Â  Â Â Â Â Â Â  performance criteria (e.g. packets delay, packet loos, 
>>>jitter)
>>> 
>>>Â  Â Â Â Â Â Â  to provide better application performance by choosing the  
>>>right
>>> 
>>>Â  Â Â Â Â Â Â  underlay that meets or exceeds the specified criteria.
>>> 
>>> Firstly, s/loos/loss/ ðŸ˜Š
>>> 
>>> But I am concerned by the concept of "application routing" and I note 
>>> that the term is not used elsewhere in the document nor is the 
>>> concept expanded upon.
>>> 
>>> As will be seen from the Application Aware Networking (APN) effort, 
>>> the concept of traffic flows being routed according to the identity 
>>> of the application is made complicated by various privacy and 
>>> security concerns, not to mention issues of registering application identities.
>>> 
>>> Fortunately, I suspect that this draft wants to do something similar 
>>> to
>>> APN: that is, to classify the service that a particular 
>>> application-sourced flow wants to receive from the network. This may 
>>> be considerably more complex than DSCP, but the concept is the same 
>>> that either a tunnel/pipe/flow is negotiated and established for use 
>>> by the application, or the packets are 'coloured' for routing and 
>>> treatment in the network.
>>> 
>>> I would suggest two things:
>>> 
>>> 1. Be a lot more clear about what is meant by "application routing" 
>>> possibly even using a different term 2. Have a look at the APN work - 
>>> side meeting on Thursday; see 
>>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit
>>> h 
>>> ub.com%2FAPN-Community%2FIETF108-Side-Meeting-APN&amp;data=02%7C01%7C
>>> l
>>> inda.dunbar%40futurewei.com%7C9eec1ed693124518fec508d83545d5a4%7C0fee
>>> 8 
>>> ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637317921353374840&amp;sdata=J0
>>> U
>>> SmGqeVz9pR5MmJRoOdTZFrmmJ8JiSFKAz4wuNgNs%3D&amp;reserved=0
>>> <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgi
>>> t 
>>> hub.com%2FAPN-Community%2FIETF108-Side-Meeting-APN&amp;data=02%7C01%7
>>> C 
>>> linda.dunbar%40futurewei.com%7C9eec1ed693124518fec508d83545d5a4%7C0fe
>>> e
>>> 8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637317921353374840&amp;sdata=J
>>> 0 USmGqeVz9pR5MmJRoOdTZFrmmJ8JiSFKAz4wuNgNs%3D&amp;reserved=0>
>>> for all the details
>>> 
>>> Best,
>>> 
>>> Adrian
>>> 
>>> ---------------------------------------------------------------------
>>> -
>>> --------
>>> 
>>> External Email: Please use caution when opening links and attachments 
>>> / Courriel externe: Soyez prudent avec les liens et documents joints
>>> 
>>> ---------------------------------------------------------------------
>>> -
>>> --
>>> 
>>> */External Email:/*/Please use caution when opening links and 
>>> attachments / /*/Courriel externe:/*/Soyez prudent avec les liens et 
>>> documents joints /
>>> 
>>> ---------------------------------------------------------------------
>>> -
>>> --
>>> 
>>> */External Email:/*/Please use caution when opening links and 
>>> attachments / /*/Courriel externe:/*/Soyez prudent avec les liens et 
>>> documents joints /
>>> 
>>> 
>>> _______________________________________________
>>> BESS mailing list
>>> BESS@ietf.org <mailto:BESS@ietf.org> <mailto:BESS@ietf.org>
>>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.
>>> ietf.org%2Fmailman%2Flistinfo%2Fbess&amp;data=02%7C01%7Clinda.dunbar%
>>> 4 
>>> 0futurewei.com%7C9eec1ed693124518fec508d83545d5a4%7C0fee8ff2a3b240189
>>> c 
>>> 753a1d5591fedc%7C1%7C0%7C637317921353374840&amp;sdata=6XAaNduwfa3MmKO
>>> C
>>> u8eHydfaNzI%2F1dfgjfrBZiRXL4E%3D&amp;reserved=0
>>> 


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Subject: [bess] I-D Action: draft-ietf-bess-bgp-sdwan-usage-00.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 BGP Enabled ServiceS WG of the IETF.

        Title           : BGP Usage for SDWAN Overlay Networks
        Authors         : Linda Dunbar
                          James Guichard
                          Ali Sajassi
                          John Drake
                          Basil Najem
                          David Carrel
	Filename        : draft-ietf-bess-bgp-sdwan-usage-00.txt
	Pages           : 28
	Date            : 2020-08-03

Abstract:
   The document describes three distinct SDWAN scenarios and discusses
   the applicability of BGP for each of those scenarios. The goal of
   the document is to demonstrate how BGP-based control plane is used
   for large scale SDWAN overlay networks with little manual
   intervention.

   SDWAN edge nodes are commonly interconnected by multiple underlay
   networks which can be owned and managed by different network
   providers.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-bgp-sdwan-usage/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-bgp-sdwan-usage-00
https://datatracker.ietf.org/doc/html/draft-ietf-bess-bgp-sdwan-usage-00


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: Linda Dunbar <linda.dunbar@futurewei.com>
To: "Ali Sajassi (sajassi)" <sajassi@cisco.com>, "bess@ietf.org" <bess@ietf.org>, "idr@ietf.org" <idr@ietf.org>, "'shares@ndzh.com'" <shares@ndzh.com>
Thread-Topic: SECURE-EVPN's  IPsec SA Inheritance can be improved by the mechanism described by  draft-dunbar-idr-sdwan-edge-discovery. Would you consider? 
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Hi Gyan,

=20

Thanks so much for casting an eye over this document.

=20

Here are some answers to the points you raised.

=20

Best,

Adrian

=20

I support the draft and the problems it is trying to address with SR-TR =
steering over multiple AS hops and the GW auto discovery features.

=20

AF> Thanks. We think it has stood the test of time, and the evolution of =
SR deployments has confirmed our view.

=20

I do have a few questions on the latest draft. I read through the =
discussion with Boris and has some additional follow on questions.

=20

In the Intro section 1 describing the problem statement it is said that =
load balancing cannot occur as only one best path is chosen which is =
true.  However if you enabled eibgp multipath maximum paths set that =
both paths as long as BGP path selection all attributes are equal =
traffic can be easily load balanced between AS2 and egress SR domain.=20

=20

AF> This is true. But the point we were trying to make is that it is =
hard to load balance between the AS1-AS2 paths and the AS3 path.

=20

It is not mentioned if AS2 is IP only or mpls IP VPN domain and if a =
route reflector exist. I think that is important to mention as this =
gateway auto discovery feature uses  RT extended community set and so if =
the core is IP VPN used that does complicate the architecture as now SAF =
1 now stacked with SAFI 128.  I have more questions on that topic =
discussed further down.

=20

AF> What Figure 1 does is give a generic architecture to allow =
discussion of the possibilities. So, one could have such a network with =
AS2 as plain IP, with MPLS/IP, with a VPN overlay (although perhaps that =
is less common for a single AS providing interconnect?), with a route =
reflector or without. You can make this almost as complicated as you =
like and BGP can handle it.

=20

In that scenario as long as RD is auto on the PEs and eibgp multipath is =
enabled the RR will reflect multiple paths by unique RF and traffic can =
be load balanced from AS2 to egress SR domain.  For load balancing you =
would not want to do =E2=80=9Cadd paths=E2=80=9D as you would still only =
have one valid/best path in BGP best path selection. Also as =
=E2=80=9Cadd paths=E2=80=9D is generally used BGP PIC edge to advertise =
and pre program backup paths but is completely orthogonal to load =
balancing goal.

=20

AF> Yes, I agree that you can do some limited load balancing across one =
AS and into the egress SR domain. It is more complicated to pick the =
egress point from AS1 to load balance into the egress domain, and to =
load balance between the different AS paths.

=20

So now the real problem is not that load balancing won=E2=80=99t work in =
AS2 but rather that the GW1 GW2 next hops are not propagated to AS1.

=20

AF> Right. Yes, that=E2=80=99s it. And because they are not propagated, =
AS1 cannot know to load balance into AS2.

=20

What if you used the basic construct from inter-as option C RR to RR =
eBGP vpn peering and did the same from the SR egress domain GW1 GW2 ebgp =
multihop with next hop unchanged to AS1 ASBRs transit peers over the AS2 =
and that would propagate GW1 GW2 next hops.  On the ebgp multi hop peers =
between SR egress domain and AS2 you could mesh the peering so each ASBR =
in AS2 peers with both GW1 and GW2 and you could enable ebgp multipath =
to load balance over next hops to both gateways.

=20

AF> I believe this gets quite complicated if there is a longer string of =
ASes or even an AS mesh. It also, as you say, requires the use of route =
reflectors which, although now common, are not always present.

=20

I read through this draft that was referenced and it talks about the =
concept of DC to DC or any external edge SR domain and traffic steering =
with SR-TE binding SID end to end steering.  In that drafts context the =
backbone is  MPLS or SR-MPLS or IP.=20

=20

https://datatracker.ietf.org/doc/html/draft-farrel-spring-sr-domain-inter=
connect-05

=20

AF> Yes, I=E2=80=99m quite attached to that draft, but it seems that it =
got no traction with the SPRING chairs. The intention of that draft was =
to explain more clearly the deployment and operational possibilities =
without cluttering this document which tries to focus more on the =
specific protocol extensions.

=20

For the gateway draft for clarity it would be good to specify if the AS2 =
backbone could actually be the following flavors IP, MPLS with global =
table routing native BGP to the edge, MPLS IP VPN, SR-MPLS IP VPN, SRv6 =
IP VPN.  Maybe also mention from a topology level with or without Route =
Reflector in AS2.

=20

AF> OK. We can clarify this.

=20

Section 3 GW auto discovery questions

=20

So each edge SR domain has an SR domain identifier which identifies all =
GWs in the domain and is unique to the domain and all prefixes exported =
have RT value for which is the SR domain identifier.

=20

Please specify if RT type O, 1, 2 used or any or if it matters.  I think =
AS:NN  type 0 or 4 would be appropriate to account for 2 byte and 4 byte =
ASN - RT nomenclature to embed the domain identifier would make sense as =
the edges AS could be the X:Y X value and the Y could be the unique =
domain identifier.

=20

AF> I think the use of 0x00 or 0x02 in the high-order octet of the RT =
Type field are most likely, but there is no reason why 0x01 should not =
be used if that is how the AS is managed. And this would not make any =
difference to how the mechanisms in this document work. The scheme you =
describe is certainly plausible.

=20

I noticed SAFI 4 BGP-LU is in the list of SAFI.  That is traditionally =
used for inter-as L3 VPN optC or CsC flavors.  In the context of SR as =
this draft is geared towards if you are using SR-TE with binding sid =
policy across each AS hop NNI boundary stitching the steered path you =
would not need BGP-LU.  Also if the AS 2 core is MPLS only then would =
you need BGP-LU and only if using option C.  There are caveats with =
other inter-as options related to multicast MVPN that recommends =
stacking BGP-LU as well for mLDP inband signaling.

=20

Yes. But unless anyone sees a good reason to rule out using SAFI 4, we =
prefer to keep the option open. If no one uses it, I guess that is OK.

=20

That  is all the more reason to be crystal clear on the topology of the =
transit ASs in the mix here - AS 2 and AS 1  and if it=E2=80=99s every =
possible flavor then we should state that as well. =20

=20

I think from a operators standpoint it would make sense to have the =
draft account for all AS2 transport backbone flavors that are possible =
and account for how this solution would work for every flavor as their =
maybe lots of caveats as you did into the weeds with each flavor. =20

=20

It is certainly our intent to support =E2=80=9Call possible =
flavours=E2=80=9D so we will make that clear in the document.

=20

The auto-discovery route that each GW advertises consists of the
   following:
=20
   o  An IPv4 or IPv6 NLRI containing one of the GW's loopback addresses
      (that is, with an AFI/SAFI pair that is one of 1/1, 2/1, 1/4, or
      2/4).

=20

Section 3 what seems to be missing in connecting the dots on how this =
solution would work is that you talk about the GWs import of the RTs =
which is fine but what is missing is the BGP interaction to backbone AS2 =
and all the possible variations of the AS2 transport.  I think that will =
really help explain.

=20

It is hard to tell but are we doing ebgp multihop over GRE tunneling =
over AS2 and AS1 which is why we don=E2=80=99t talk about that the =
middle ASs routing details.

=20

The BGP behavior except at the gateways is =E2=80=9Cas normal=E2=80=9D. =
The data packets are carried over the intervening ASes using tunnels as =
described by the tunnel encapsulations.

=20

Section 5 is the first mention of SR-TE in the draft and starts talking =
about the SR-MPLS label stack.  Both paragraphs are very confusing as =
more context or a detailed stick diagram would help.

=20

What may help is an end to end packet walk on the discovery mechanism.=20

=20

We will work to clarify this text without (re-)defining how SR-TE works.

=20

I think leaving out the AS2 AS1 BGP interaction makes it difficult to =
follow and connect the dots on the solution.

=20

This really is =E2=80=9Cbusiness as usual=E2=80=9D for tunnel =
encapsulation.

=20

On Thu, Jun 4, 2020 at 1:35 PM Adrian Farrel <adrian@olddog.co.uk =
<mailto:adrian@olddog.co.uk> > wrote:

Hi,

This late-breaking revision just tweaks for the discussion with Boris.

Thanks,
Adrian

-----Original Message-----
From: BESS <bess-bounces@ietf.org <mailto:bess-bounces@ietf.org> > On =
Behalf Of internet-drafts@ietf.org <mailto:internet-drafts@ietf.org>=20
Sent: 04 June 2020 18:33
To: i-d-announce@ietf.org <mailto:i-d-announce@ietf.org>=20
Cc: bess@ietf.org <mailto:bess@ietf.org>=20
Subject: [bess] I-D Action: draft-ietf-bess-datacenter-gateway-07.txt


A New Internet-Draft is available from the on-line Internet-Drafts
directories.
This draft is a work item of the BGP Enabled ServiceS WG of the IETF.

        Title           : Gateway Auto-Discovery and Route Advertisement =
for
Segment Routing Enabled Domain Interconnection
        Authors         : Adrian Farrel
                          John Drake
                          Eric Rosen
                          Keyur Patel
                          Luay Jalil
        Filename        : draft-ietf-bess-datacenter-gateway-07.txt
        Pages           : 12
        Date            : 2020-06-04

Abstract:
   Data centers are critical components of the infrastructure used by
   network operators to provide services to their customers.  Data
   centers are attached to the Internet or a backbone network by gateway
   routers.  One data center typically has more than one gateway for
   commercial, load balancing, and resiliency reasons.

   Segment Routing is a protocol mechanism that can be used within a
   data center, and also for steering traffic that flows between two
   data center sites.  In order that one data center site may load
   balance the traffic it sends to another data center site, it needs to
   know the complete set of gateway routers at the remote data center,
   the points of connection from those gateways to the backbone network,
   and the connectivity across the backbone network.

   Segment Routing may also be operated in other domains, such as access
   networks.  Those domains also need to be connected across backbone
   networks through gateways.

   This document defines a mechanism using the BGP Tunnel Encapsulation
   attribute to allow each gateway router to advertise the routes to the
   prefixes in the Segment Routing domains to which it provides access,
   and also to advertise on behalf of each other gateway to the same
   Segment Routing domain.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-datacenter-gateway/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-datacenter-gateway-07
https://datatracker.ietf.org/doc/html/draft-ietf-bess-datacenter-gateway-=
07

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-bess-datacenter-gateway-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 =
<http://tools.ietf.org> .

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


_______________________________________________
BESS mailing list
BESS@ietf.org <mailto:BESS@ietf.org>=20
https://www.ietf.org/mailman/listinfo/bess

_______________________________________________
BESS mailing list
BESS@ietf.org <mailto:BESS@ietf.org>=20
https://www.ietf.org/mailman/listinfo/bess

--=20

 <http://www.verizon.com/>=20

Gyan Mishra

Network Solutions Architect=20

M 301 502-1347
13101 Columbia Pike=20
Silver Spring, MD

=20

--=20

 <http://www.verizon.com/>=20

Gyan Mishra

Network Solutions Architect=20

M 301 502-1347
13101 Columbia Pike=20
Silver Spring, MD

=20


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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'>Hi =
Gyan,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></spa=
n></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'>Thanks so much for =
casting an eye over this document.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></spa=
n></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'>Here are some answers =
to the points you raised.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></spa=
n></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'>Best,<o:p></o:p></span=
></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'>Adrian<o:p></o:p></spa=
n></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><div><di=
v><blockquote style=3D'border:none;border-left:solid #CCCCCC =
1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><div><p class=3DMsoNormal>I =
support the draft and the problems it is trying to address with SR-TR =
steering over multiple AS hops and the GW auto discovery =
features.<o:p></o:p></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'color:#0070C0'>AF&gt; Thanks. We think =
it has stood the test of time, and the evolution of SR deployments has =
confirmed our view.<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>I =
do have a few questions on the latest draft. I read through the =
discussion with Boris and has some additional follow on =
questions.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>In the Intro section 1 describing the problem =
statement it is said that load balancing cannot occur as only one best =
path is chosen which is true.&nbsp; However if you enabled eibgp =
multipath maximum paths set that both paths as long as BGP path =
selection all attributes are equal traffic can be easily load balanced =
between AS2 and egress SR domain.&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0'>AF&gt; This is true. But the point we were =
trying to make is that it is hard to load balance between the AS1-AS2 =
paths and the AS3 path.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>It is not mentioned if AS2 is IP only or mpls IP VPN =
domain and if a route reflector exist. I think that is important to =
mention as this gateway auto discovery feature uses &nbsp;RT extended =
community set and so if the core is IP VPN used that does complicate the =
architecture as now SAF 1 now stacked with SAFI 128.&nbsp; I have more =
questions on that topic discussed further =
down.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0'>AF&gt; What Figure 1 does is give a generic =
architecture to allow discussion of the possibilities. So, one could =
have such a network with AS2 as plain IP, with MPLS/IP, with a VPN =
overlay (although perhaps that is less common for a single AS providing =
interconnect?), with a route reflector or without. You can make this =
almost as complicated as you like and BGP can handle =
it.<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>In that scenario as long as RD is auto on the PEs and =
eibgp multipath is enabled the RR will reflect multiple paths by unique =
RF and traffic can be load balanced from AS2 to egress SR domain.&nbsp; =
For load balancing you would not want to do =E2=80=9Cadd paths=E2=80=9D =
as you would still only have one valid/best path in BGP best path =
selection. Also as =E2=80=9Cadd paths=E2=80=9D is generally used BGP PIC =
edge to advertise and pre program backup paths but is completely =
orthogonal to load balancing goal.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0'>AF&gt; Yes, I agree that you can do some limited =
load balancing across one AS and into the egress SR domain. It is more =
complicated to pick the egress point from AS1 to load balance into the =
egress domain, and to load balance between the different AS =
paths.<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>So now the real problem is not that load balancing =
won=E2=80=99t work in AS2 but rather that the GW1 GW2 next hops are not =
propagated to AS1.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0'>AF&gt; Right. Yes, that=E2=80=99s it. And =
because they are not propagated, AS1 cannot know to load balance into =
AS2.<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>What if you used the basic construct from inter-as =
option C RR to RR eBGP vpn peering and did the same from the SR egress =
domain GW1 GW2 ebgp multihop with next hop unchanged to AS1 ASBRs =
transit peers over the AS2 and that would propagate GW1 GW2 next =
hops.&nbsp; On the ebgp multi hop peers between SR egress domain and AS2 =
you could mesh the peering so each ASBR in AS2 peers with both GW1 and =
GW2 and you could enable ebgp multipath to load balance over next hops =
to both gateways.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0'>AF&gt; I believe this gets quite complicated if =
there is a longer string of ASes or even an AS mesh. It also, as you =
say, requires the use of route reflectors which, although now common, =
are not always present.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>I =
read through this draft that was referenced and it talks about the =
concept of DC to DC or any external edge SR domain and traffic steering =
with SR-TE binding SID end to end steering.&nbsp; In that drafts context =
the backbone is &nbsp;MPLS or SR-MPLS or =
IP.&nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><div><p =
class=3DMsoNormal><a =
href=3D"https://datatracker.ietf.org/doc/html/draft-farrel-spring-sr-doma=
in-interconnect-05" =
target=3D"_blank">https://datatracker.ietf.org/doc/html/draft-farrel-spri=
ng-sr-domain-interconnect-05</a><o:p></o:p></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><span style=3D'color:#0070C0'>AF&gt; Yes, I=E2=80=99m =
quite attached to that draft, but it seems that it got no traction with =
the SPRING chairs. The intention of that draft was to explain more =
clearly the deployment and operational possibilities without cluttering =
this document which tries to focus more on the specific protocol =
extensions.<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>For the gateway draft for clarity it would be good to =
specify if the AS2 backbone could actually be the following flavors IP, =
MPLS with global table routing native BGP to the edge, MPLS IP VPN, =
SR-MPLS IP VPN, SRv6 IP VPN.&nbsp; Maybe also mention from a topology =
level with or without Route Reflector in AS2.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0'>AF&gt; OK. We can clarify =
this.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Section 3 GW auto discovery =
questions<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>So each edge SR domain has an SR domain identifier =
which identifies all GWs in the domain and is unique to the domain and =
all prefixes exported have RT value for which is the SR domain =
identifier.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Please specify if RT type O, 1, 2 used or any or if it =
matters.&nbsp; I think AS:NN &nbsp;type 0 or 4 would be appropriate to =
account for 2 byte and 4 byte ASN - RT nomenclature to embed the domain =
identifier would make sense as the edges AS could be the X:Y X value and =
the Y could be the unique domain identifier.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0'>AF&gt; I think the use of 0x00 or 0x02 in the =
high-order octet of the RT Type field are most likely, but there is no =
reason why 0x01 should not be used if that is how the AS is managed. And =
this would not make any difference to how the mechanisms in this =
document work. The scheme you describe is certainly =
plausible.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>I =
noticed SAFI 4 BGP-LU is in the list of SAFI.&nbsp; That is =
traditionally used for inter-as L3 VPN optC or CsC flavors.&nbsp; In the =
context of SR as this draft is geared towards if you are using SR-TE =
with binding sid policy across each AS hop NNI boundary stitching the =
steered path you would not need BGP-LU.&nbsp; Also if the AS 2 core is =
MPLS only then would you need BGP-LU and only if using option C.&nbsp; =
There are caveats with other inter-as options related to multicast MVPN =
that recommends stacking BGP-LU as well for mLDP inband =
signaling.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0'>Yes. But unless anyone sees a good reason to =
rule out using SAFI 4, we prefer to keep the option open. If no one uses =
it, I guess that is OK.<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>That &nbsp;is all the more reason to be crystal clear =
on the topology of the transit ASs in the mix here - AS 2 and AS 1 =
&nbsp;and if it=E2=80=99s every possible flavor then we should state =
that as well. &nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>I =
think from a operators standpoint it would make sense to have the draft =
account for all AS2 transport backbone flavors that are possible and =
account for how this solution would work for every flavor as their maybe =
lots of caveats as you did into the weeds with each flavor. =
&nbsp;<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p =
class=3DMsoNormal><span style=3D'color:#0070C0'>It is certainly our =
intent to support =E2=80=9Call possible flavours=E2=80=9D so we will =
make that clear in the document.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><pre =
style=3D'background:white;word-break:break-all;box-sizing:border-box;word=
-wrap:break-word;border-top-left-radius:4px;border-top-right-radius:4px;b=
order-bottom-right-radius:4px;border-bottom-left-radius:4px;overflow:auto=
'><span style=3D'font-size:10.5pt;color:black'>The auto-discovery route =
that each GW advertises consists of the</span><span =
style=3D'font-size:10.5pt'><o:p></o:p></span></pre><pre =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;color:black'>=C2=A0=C2=A0 =
following:</span><span =
style=3D'font-size:10.5pt'><o:p></o:p></span></pre><pre =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt'><o:p>&nbsp;</o:p></span></pre><pre =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;color:black'>=C2=A0=C2=A0 o=C2=A0 An IPv4 or =
IPv6 NLRI containing one of the GW's loopback addresses</span><span =
style=3D'font-size:10.5pt'><o:p></o:p></span></pre><pre =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;color:black'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
(that is, with an AFI/SAFI pair that is one of 1/1, 2/1, 1/4, =
or</span><span style=3D'font-size:10.5pt'><o:p></o:p></span></pre><pre =
style=3D'background:white;word-break:break-all'><span =
style=3D'font-size:10.5pt;color:black'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
2/4).</span><span =
style=3D'font-size:10.5pt'><o:p></o:p></span></pre></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Section 3 what seems to be missing in connecting the =
dots on how this solution would work is that you talk about the GWs =
import of the RTs which is fine but what is missing is the BGP =
interaction to backbone AS2 and all the possible variations of the AS2 =
transport.&nbsp; I think that will really help =
explain.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>It is hard to tell but are we doing ebgp multihop over =
GRE tunneling over AS2 and AS1 which is why we don=E2=80=99t talk about =
that the middle ASs routing details.<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0'>The BGP behavior except at the gateways is =
=E2=80=9Cas normal=E2=80=9D. The data packets are carried over the =
intervening ASes using tunnels as described by the tunnel =
encapsulations.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Section 5 is the first mention of SR-TE in the draft =
and starts talking about the SR-MPLS label stack.&nbsp; Both paragraphs =
are very confusing as more context or a detailed stick diagram would =
help.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>What may help is an end to end packet walk on the =
discovery mechanism.&nbsp;<o:p></o:p></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0'>We will work to clarify this text without =
(re-)defining how SR-TE works.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>I =
think leaving out the AS2 AS1 BGP interaction makes it difficult to =
follow and connect the dots on the solution.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0'>This really is =E2=80=9Cbusiness as =
usual=E2=80=9D for tunnel encapsulation.<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p class=3DMsoNormal>On =
Thu, Jun 4, 2020 at 1:35 PM Adrian Farrel &lt;<a =
href=3D"mailto:adrian@olddog.co.uk" =
target=3D"_blank">adrian@olddog.co.uk</a>&gt; =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm =
6.0pt;margin-left:4.8pt;margin-right:0cm'><p =
class=3DMsoNormal>Hi,<br><br>This late-breaking revision just tweaks for =
the discussion with Boris.<br><br>Thanks,<br>Adrian<br><br>-----Original =
Message-----<br>From: BESS &lt;<a href=3D"mailto:bess-bounces@ietf.org" =
target=3D"_blank">bess-bounces@ietf.org</a>&gt; On Behalf Of <a =
href=3D"mailto:internet-drafts@ietf.org" =
target=3D"_blank">internet-drafts@ietf.org</a><br>Sent: 04 June 2020 =
18:33<br>To: <a href=3D"mailto:i-d-announce@ietf.org" =
target=3D"_blank">i-d-announce@ietf.org</a><br>Cc: <a =
href=3D"mailto:bess@ietf.org" =
target=3D"_blank">bess@ietf.org</a><br>Subject: [bess] I-D Action: =
draft-ietf-bess-datacenter-gateway-07.txt<br><br><br>A New =
Internet-Draft is available from the on-line =
Internet-Drafts<br>directories.<br>This draft is a work item of the BGP =
Enabled ServiceS WG of the IETF.<br><br>&nbsp; &nbsp; &nbsp; &nbsp; =
Title&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;: Gateway Auto-Discovery =
and Route Advertisement for<br>Segment Routing Enabled Domain =
Interconnection<br>&nbsp; &nbsp; &nbsp; &nbsp; Authors&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;: Adrian Farrel<br>&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; John =
Drake<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; Eric Rosen<br>&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Keyur =
Patel<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; Luay Jalil<br>&nbsp; &nbsp; &nbsp; &nbsp; =
Filename&nbsp; &nbsp; &nbsp; &nbsp; : =
draft-ietf-bess-datacenter-gateway-07.txt<br>&nbsp; &nbsp; &nbsp; &nbsp; =
Pages&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;: 12<br>&nbsp; &nbsp; =
&nbsp; &nbsp; Date&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; : =
2020-06-04<br><br>Abstract:<br>&nbsp; &nbsp;Data centers are critical =
components of the infrastructure used by<br>&nbsp; &nbsp;network =
operators to provide services to their customers.&nbsp; Data<br>&nbsp; =
&nbsp;centers are attached to the Internet or a backbone network by =
gateway<br>&nbsp; &nbsp;routers.&nbsp; One data center typically has =
more than one gateway for<br>&nbsp; &nbsp;commercial, load balancing, =
and resiliency reasons.<br><br>&nbsp; &nbsp;Segment Routing is a =
protocol mechanism that can be used within a<br>&nbsp; &nbsp;data =
center, and also for steering traffic that flows between two<br>&nbsp; =
&nbsp;data center sites.&nbsp; In order that one data center site may =
load<br>&nbsp; &nbsp;balance the traffic it sends to another data center =
site, it needs to<br>&nbsp; &nbsp;know the complete set of gateway =
routers at the remote data center,<br>&nbsp; &nbsp;the points of =
connection from those gateways to the backbone network,<br>&nbsp; =
&nbsp;and the connectivity across the backbone network.<br><br>&nbsp; =
&nbsp;Segment Routing may also be operated in other domains, such as =
access<br>&nbsp; &nbsp;networks.&nbsp; Those domains also need to be =
connected across backbone<br>&nbsp; &nbsp;networks through =
gateways.<br><br>&nbsp; &nbsp;This document defines a mechanism using =
the BGP Tunnel Encapsulation<br>&nbsp; &nbsp;attribute to allow each =
gateway router to advertise the routes to the<br>&nbsp; &nbsp;prefixes =
in the Segment Routing domains to which it provides access,<br>&nbsp; =
&nbsp;and also to advertise on behalf of each other gateway to the =
same<br>&nbsp; &nbsp;Segment Routing domain.<br><br><br>The IETF =
datatracker status page for this draft is:<br><a =
href=3D"https://datatracker.ietf.org/doc/draft-ietf-bess-datacenter-gatew=
ay/" =
target=3D"_blank">https://datatracker.ietf.org/doc/draft-ietf-bess-datace=
nter-gateway/</a><br><br>There are also htmlized versions available =
at:<br><a =
href=3D"https://tools.ietf.org/html/draft-ietf-bess-datacenter-gateway-07=
" =
target=3D"_blank">https://tools.ietf.org/html/draft-ietf-bess-datacenter-=
gateway-07</a><br><a =
href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-bess-datacenter-=
gateway-07" =
target=3D"_blank">https://datatracker.ietf.org/doc/html/draft-ietf-bess-d=
atacenter-gateway-07</a><br><br>A diff from the previous version is =
available at:<br><a =
href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-bess-datacenter-ga=
teway-07" =
target=3D"_blank">https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-bess-dat=
acenter-gateway-07</a><br><br><br>Please note that it may take a couple =
of minutes from the time of submission<br>until the htmlized version and =
diff are available at <a href=3D"http://tools.ietf.org" =
target=3D"_blank">tools.ietf.org</a>.<br><br>Internet-Drafts are also =
available by anonymous FTP at:<br><a =
href=3D"ftp://ftp.ietf.org/internet-drafts/" =
target=3D"_blank">ftp://ftp.ietf.org/internet-drafts/</a><br><br><br>____=
___________________________________________<br>BESS mailing list<br><a =
href=3D"mailto:BESS@ietf.org" target=3D"_blank">BESS@ietf.org</a><br><a =
href=3D"https://www.ietf.org/mailman/listinfo/bess" =
target=3D"_blank">https://www.ietf.org/mailman/listinfo/bess</a><br><br>_=
______________________________________________<br>BESS mailing =
list<br><a href=3D"mailto:BESS@ietf.org" =
target=3D"_blank">BESS@ietf.org</a><br><a =
href=3D"https://www.ietf.org/mailman/listinfo/bess" =
target=3D"_blank">https://www.ietf.org/mailman/listinfo/bess</a><o:p></o:=
p></p></blockquote></div></div><p class=3DMsoNormal>-- =
<o:p></o:p></p><div><div><div><div><div><div><div><div><div><p><a =
href=3D"http://www.verizon.com/" target=3D"_blank"><span =
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style=3D'color:#222222'><o:p></o:p></span></p><p =
style=3D'margin:0cm;mso-line-height-alt:9.75pt'><b><span =
style=3D'font-family:"Arial",sans-serif;color:black'>Gyan =
Mishra</span></b><span =
style=3D'font-family:"Arial",sans-serif;color:black'><o:p></o:p></span></=
p><p style=3D'margin:0cm;mso-line-height-alt:9.75pt'><i><span =
style=3D'font-family:"Georgia",serif;color:black'>Network Solutions =
Architect&nbsp;</span></i><span =
style=3D'color:#222222'><o:p></o:p></span></p><p =
style=3D'margin:0cm;mso-line-height-alt:9.75pt'><i><span =
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502-1347<br>13101 Columbia Pike&nbsp;<br></span></i><span =
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MD<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div></div></div></div></div></di=
v></div></div></div></blockquote></div></div><p class=3DMsoNormal>-- =
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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Linda Dunbar'" <linda.dunbar@futurewei.com>
Cc: <draft-ietf-bess-datacenter-gateway@ietf.org>, "'BESS'" <bess@ietf.org>
References: <07cf01d63a95$fcbf6c70$f63e4550$@olddog.co.uk> <00c901d63d6e$84e9cca0$8ebd65e0$@gmail.com> <CAOj+MMFPTJZQM=9sCcbjZ986n5suWFmaJS7iruyv8exfMq9yeA@mail.gmail.com> <SN6PR13MB2334B7460BBF6EEFC93681EB85850@SN6PR13MB2334.namprd13.prod.outlook.com>
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Date: Tue, 11 Aug 2020 15:31:44 +0100
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Subject: Re: [bess] Closing on Stephane's open issue with draft-ietf-bess-datacenter-gateway
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Hi Linda,

=20

Sorry that I missed this question from you=E2=80=A6

=20

Adrian:=20

On page 6, the second Bullet says that=20

=E2=80=9CEach GW constructs an import filtering rule to import any route =
that carries a route target with the same SR domain identifier that the =
GW itself uses=E2=80=9D

=20

How about routes associated to a VPN and to a SR domain? The VPN and the =
SR might use different RTs. Can you have two different Route Target in =
one advertisement?

=20

AF > We certainly don=E2=80=99t want to restrict wider applicability, =
but our focus is only on connecting together SR domains. We =
weren=E2=80=99t looking to solve the multi-homed VPN =
=E2=80=9Cproblem=E2=80=9D.

=20

AF > The RT is an extended community. Extended communities are carried =
in the Extended Communities Attribute. The Extended Communities =
Attribute can carry more than one extended community.

=20

Best,

Adrian


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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'>Hi =
Linda,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></spa=
n></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'>Sorry that I missed =
this question from you=E2=80=A6<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>Adrian: <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US>On page 6, the second Bullet says =
that <o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><i><span lang=3DEN-US>=E2=80=9CEach GW =
constructs an import filtering rule to import any route that carries a =
route target with the same SR domain identifier that the GW itself =
uses=E2=80=9D<o:p></o:p></span></i></p><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>How about routes associated to a VPN and to a SR domain? =
The VPN and the SR might use different RTs. Can you have two different =
Route Target in one advertisement?<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 style=3D'color:#0070C0'>AF &gt; We =
certainly don=E2=80=99t want to restrict wider applicability, but our =
focus is only on connecting together SR domains. We weren=E2=80=99t =
looking to solve the multi-homed VPN =
=E2=80=9Cproblem=E2=80=9D.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#0070C0'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:#0070C0'>AF &gt; The =
RT is an extended community. Extended communities are carried in the =
Extended Communities Attribute. The Extended Communities Attribute can =
carry more than one extended community.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#0070C0'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#0070C0'>Best,<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#0070C0'>Adrian<o:p></o:p></span></p></div></body></html>
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Reply-To: <adrian@olddog.co.uk>
From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'Ravi Singh'" <ravi.singh.ietf@gmail.com>, <bess-chairs@ietf.org>, <draft-ietf-bess-datacenter-gateway@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/hJYx7YpHIT4uWaIxci0nLSSBEVk>
Subject: Re: [bess] RtgDir Early review: draft-ietf-bess-datacenter-gateway.txt
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Hi Ravi,

=20

I=E2=80=99m doing housekeeping on this draft and find your review. It =
looks like we didn=E2=80=99t respond =E2=80=93 sorry.

=20

Many thanks for the careful review.=20

=20

Comments are in line=E2=80=A6

=20

Intended Status: Standards track (but is it the right one? Should this =
be informational instead, since no new encodings are explicitly =
specified)





Summary:

=20

I have some minor concerns about this document that I think should be =
resolved before it is submitted to the IESG.

=20

Comments:

1. Draft track: does this need to be "standards track=E2=80=9D? No new =
encodings are specified, even though there are requests for new IANA =
code-points.

=20

AF> The document asks for a code point from the =E2=80=9CBGP Tunnel =
Encapsulation Attribute Sub-TLVs" registry for which the registration =
policy for this registry is Standards Action. So we have to be a =
Standards Track document.

=20

2. Section 3:

          a. Auto-discovery: setting the route-target to SR-ID: how to =
avoid conflicts in regards to route-target settings: some may represent =
the SR ID and other represent non-SR constructs? Some text in that =
regard would be helpful.

=20

AF> These are not VPN routes so there shouldn=E2=80=99t be any conflict. =
But I think your question might be about what happens if other RTs need =
to be present on the same advertisement. And the answer is, =
=E2=80=9Cjust do it=E2=80=9D.

=20

          b. The draft would do well to explicitly state what happens if =
the GWs in a given domain end up getting configured with different SR =
IDs.

=20

AF> We will add a little text.  Basically they would not auto-discover =
each other and a receiver would just get the best route with only the =
advertising node=E2=80=99s tunnel encapsulation information.

=20

          c. Is there a specific reason why neither the format for the =
SR tunnel TLV is listed nor a pointer given to a pre-existing definition =
in another doc?

=20

AF> We will add a reference to  =
<https://datatracker.ietf.org/doc/html/draft-ietf-idr-tunnel-encaps-15#se=
ction-2> =
https://datatracker.ietf.org/doc/html/draft-ietf-idr-tunnel-encaps-15#sec=
tion-2

=20

3. Section. 5: could use an example with reference to figure 1.

=20

AF> Yup. Several people have asked for examples. We=E2=80=99ll add a =
pointer to  =
<https://datatracker.ietf.org/doc/html/draft-farrel-spring-sr-domain-inte=
rconnect-05> =
https://datatracker.ietf.org/doc/html/draft-farrel-spring-sr-domain-inter=
connect-05 section 7.

=20

4. Section 6: would be useful to describe, or provide pointer to section =
in the tunnel-encaps draft, stating logic for picking a specific =
encapsulation for a given packet.

=20

AF> The advertising node can include anything defined in either the =
Tunnel Encapsulation draft or any other subsequent drafts.  As indicated =
above, we are just defining new wrappers.

=20

Best,

Adrian


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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-GB link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'>Hi =
Ravi,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></spa=
n></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'>I=E2=80=99m doing =
housekeeping on this draft and find your review. It looks like we =
didn=E2=80=99t respond =E2=80=93 sorry.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></spa=
n></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0;mso-fareast-language:EN-US'>Many thanks for the =
careful review. <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>Comments =
are in line=E2=80=A6<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>Intended Status: Standards track (but is it the right =
one? Should this be informational instead, since no new encodings are =
explicitly specified)</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'><br><br></span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>Summary:</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>I have some minor concerns about this document that I =
think should be resolved before it is submitted to the =
IESG.</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>Comments:</span><o:p></o:p></p></div><div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>1. Draft track: does this need to be &quot;standards =
track=E2=80=9D? No new encodings are specified, even though there are =
requests for new IANA code-points.</span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:#0070C0;=
background:white'>AF&gt; The document asks for a code point from the =
=E2=80=9CBGP Tunnel Encapsulation Attribute Sub-TLVs&quot; registry for =
which the registration policy for this registry is Standards Action. So =
we have to be a Standards Track document.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>2. Section 3:</span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
class=3Dapple-tab-span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
</span></span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>a. Auto-discovery: setting the route-target to SR-ID: =
how to avoid conflicts in regards to route-target settings: some may =
represent the SR ID and other represent non-SR constructs? Some text in =
that regard would be helpful.</span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'background:white'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#0070C0;background:white'>AF&gt; =
</span><span lang=3DEN-US style=3D'color:#0070C0;background:white'>These =
are not VPN routes so there shouldn=E2=80=99t be any conflict. But I =
think your question might be about what happens if other RTs need to be =
present on the same advertisement. And the answer is, =E2=80=9Cjust do =
it=E2=80=9D.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:#0070C0;background:white'><o:p>&nbsp;</o:p></span></p></di=
v><div><p class=3DMsoNormal><span class=3Dapple-tab-span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
</span></span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>b. The draft would do well to explicitly state what =
happens if the GWs in a given domain end up getting configured with =
different SR IDs.</span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'background:white'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#0070C0;background:white'>AF&gt; =
</span><span lang=3DEN-US style=3D'color:#0070C0;background:white'>We =
will add a little text.&nbsp; Basically they would not auto-discover =
each other and a receiver would just get the best route with only the =
advertising node=E2=80=99s tunnel encapsulation information.</span><span =
style=3D'color:#0070C0;background:white'><o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'background:white'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span class=3Dapple-tab-span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
</span></span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>c. Is there a specific reason why neither the format for =
the SR tunnel TLV is listed nor a pointer given to a pre-existing =
definition in another doc?</span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'background:white'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#0070C0;background:white'>AF&gt; =
</span><span lang=3DEN-US style=3D'color:#0070C0;background:white'>We =
will add a reference to&nbsp;<a =
href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-idr-tunnel-encap=
s-15#section-2"><span =
style=3D'color:#0070C0'>https://datatracker.ietf.org/doc/html/draft-ietf-=
idr-tunnel-encaps-15#section-2</span></a></span><span =
style=3D'color:#0070C0;background:white'><o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'background:white'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>3. Section. 5: could use an example with reference to =
figure 1.</span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'background:white'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#0070C0;background:white'>AF&gt; =
Yup. Several people have asked for examples. We=E2=80=99ll add a pointer =
to </span><span lang=3DEN-US style=3D'color:#0070C0;background:white'><a =
href=3D"https://datatracker.ietf.org/doc/html/draft-farrel-spring-sr-doma=
in-interconnect-05"><span =
style=3D'color:#0070C0'>https://datatracker.ietf.org/doc/html/draft-farre=
l-spring-sr-domain-interconnect-05</span></a> section 7.</span><span =
style=3D'color:#0070C0;background:white'><o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'background:white'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black;ba=
ckground:white'>4. Section 6: would be useful to describe, or provide =
pointer to section in the tunnel-encaps draft, stating logic for picking =
a specific encapsulation for a given packet.</span><span =
style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;background:whi=
te'><o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'background:white'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:#0070C0;background:white'>AF&gt; =
</span><span lang=3DEN-US style=3D'color:#0070C0;background:white'>The =
advertising node can include anything defined in either the Tunnel =
Encapsulation draft or any other subsequent drafts.&nbsp; As indicated =
above, we are just defining new wrappers.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#0070C0;background:white'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#0070C0;background:white'>Best,<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#0070C0;background:white'>Adrian</span><span =
style=3D'color:#0070C0;background:white'><o:p></o:p></span></p></div></di=
v></div></body></html>
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Subject: [bess] I-D Action: draft-ietf-bess-datacenter-gateway-08.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 BGP Enabled ServiceS WG of the IETF.

        Title           : Gateway Auto-Discovery and Route Advertisement for Segment Routing Enabled Domain Interconnection
        Authors         : Adrian Farrel
                          John Drake
                          Eric Rosen
                          Keyur Patel
                          Luay Jalil
	Filename        : draft-ietf-bess-datacenter-gateway-08.txt
	Pages           : 13
	Date            : 2020-08-12

Abstract:
   Data centers are critical components of the infrastructure used by
   network operators to provide services to their customers.  Data
   centers are attached to the Internet or a backbone network by gateway
   routers.  One data center typically has more than one gateway for
   commercial, load balancing, and resiliency reasons.

   Segment Routing is a protocol mechanism that can be used within a
   data center, and also for steering traffic that flows between two
   data center sites.  In order that one data center site may load
   balance the traffic it sends to another data center site, it needs to
   know the complete set of gateway routers at the remote data center,
   the points of connection from those gateways to the backbone network,
   and the connectivity across the backbone network.

   Segment Routing may also be operated in other domains, such as access
   networks.  Those domains also need to be connected across backbone
   networks through gateways.

   This document defines a mechanism using the BGP Tunnel Encapsulation
   attribute to allow each gateway router to advertise the routes to the
   prefixes in the Segment Routing domains to which it provides access,
   and also to advertise on behalf of each other gateway to the same
   Segment Routing domain.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-datacenter-gateway/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-datacenter-gateway-08
https://datatracker.ietf.org/doc/html/draft-ietf-bess-datacenter-gateway-08

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-datacenter-gateway-08


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From nobody Thu Aug 13 04:32:27 2020
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Subject: [bess] Publication has been requested for draft-ietf-bess-datacenter-gateway-08
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Matthew Bocci has requested publication of draft-ietf-bess-datacenter-gateway-08 as Proposed Standard on behalf of the BESS working group.

Please verify the document's state at https://datatracker.ietf.org/doc/draft-ietf-bess-datacenter-gateway/



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Subject: [bess] I-D Action: draft-ietf-bess-evpn-lsp-ping-03.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 BGP Enabled ServiceS WG of the IETF.

        Title           : LSP-Ping Mechanisms for EVPN and PBB-EVPN
        Authors         : Parag Jain
                          Samer Salam
                          Ali Sajassi
                          Sami Boutros
                          Greg Mirsky
	Filename        : draft-ietf-bess-evpn-lsp-ping-03.txt
	Pages           : 15
	Date            : 2020-08-13

Abstract:
   LSP-Ping is a widely deployed Operation, Administration, and
   Maintenance (OAM) mechanism in MPLS networks.  This document
   describes mechanisms for detecting data-plane failures using LSP Ping
   in MPLS based EVPN and PBB-EVPN networks.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-evpn-lsp-ping/

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https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-evpn-lsp-ping-03


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Subject: [bess] Last Call: <draft-ietf-bess-evpn-na-flags-05.txt> (Propagation of ARP/ND Flags in EVPN) to Proposed Standard
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The IESG has received a request from the BGP Enabled ServiceS WG (bess) to
consider the following document: - 'Propagation of ARP/ND Flags in EVPN'
  <draft-ietf-bess-evpn-na-flags-05.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
last-call@ietf.org mailing lists by 2020-08-28. 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


   An EVPN MAC/IP Advertisement route can optionally carry an IPv4 or
   IPv6 addresses associated with a MAC address.  Remote PEs can use
   this information to populate their ARP/ND tables on IRB interfaces or
   their proxy-ARP/ND tables in Broadcast Domains (BD).  PEs can then
   reply locally (act as an ARP/ND proxy) to IPv4 ARP requests and IPv6
   Neighbor Solicitation messages and reduce/suppress the flooding
   produced by the Address Resolution procedure.  However, the
   information conveyed in the MAC/IP route may not be enough for the
   remote PE to reply to local ARP or ND requests.  For example, if a PE
   learns an IPv6->MAC ND entry via EVPN, the PE would not know if that
   particular IPv6->MAC pair belongs to a host, a router or a host with
   an anycast address, as this information is not carried in the EVPN
   MAC/IP Advertisement routes.  Similarly, other information relevant
   to the IP->MAC ARP/ND entries may be needed.  This document defines
   an Extended Community that is advertised along with an EVPN MAC/IP
   Advertisement route and carries information relevant to the ARP/ND
   resolution, so that an EVPN PE implementing a proxy-ARP/ND function
   can reply to ARP Requests or Neighbor Solicitations with the correct
   information.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-bess-evpn-na-flags/



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






From nobody Sun Aug 16 16:50:17 2020
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Subject: [bess] Erik Kline's No Objection on draft-ietf-bess-rfc5549revision-04: (with COMMENT)
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Erik Kline has entered the following ballot position for
draft-ietf-bess-rfc5549revision-04: No Objection

When responding, please keep the subject line intact and reply to all
email addresses included in the To and CC lines. (Feel free to cut this
introductory paragraph, however.)


Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
for more information about IESG DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-bess-rfc5549revision/



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

[[ comments ]]

[ section 3 ]

* Perhaps "8-octet RD is set to zero" -> "8-octet RD set to zero"

[ section 4 ]

* Perhaps "for which there is already solution" ->
  "for which there is already a solution"

* "from the onset" -> "from the outset", I think

[ section 6.2 ]

* "IPV4" -> "IPv4"

[ section 6.3 ]

* "IPV4" -> "IPv4"




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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Erik Kline <ek.ietf@gmail.com>, The IESG <iesg@ietf.org>
CC: "matthew.bocci@nokia.com" <matthew.bocci@nokia.com>, "bess-chairs@ietf.org" <bess-chairs@ietf.org>, "bess@ietf.org" <bess@ietf.org>, "draft-ietf-bess-rfc5549revision@ietf.org" <draft-ietf-bess-rfc5549revision@ietf.org>
Thread-Topic: [bess] Erik Kline's No Objection on draft-ietf-bess-rfc5549revision-04: (with COMMENT)
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Subject: Re: [bess] Erik Kline's No Objection on draft-ietf-bess-rfc5549revision-04: (with COMMENT)
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Erik Kline <ek.ietf@gmail.com>, The IESG <iesg@ietf.org>
CC: "matthew.bocci@nokia.com" <matthew.bocci@nokia.com>, "bess-chairs@ietf.org" <bess-chairs@ietf.org>, "bess@ietf.org" <bess@ietf.org>, "draft-ietf-bess-rfc5549revision@ietf.org" <draft-ietf-bess-rfc5549revision@ietf.org>
Thread-Topic: [bess] Erik Kline's No Objection on draft-ietf-bess-rfc5549revision-04: (with COMMENT)
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Subject: Re: [bess] Erik Kline's No Objection on draft-ietf-bess-rfc5549revision-04: (with COMMENT)
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From nobody Tue Aug 18 09:11:20 2020
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From: Robert Sparks via Datatracker <noreply@ietf.org>
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Subject: [bess] Genart last call review of draft-ietf-bess-evpn-na-flags-05
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Reviewer: Robert Sparks
Review result: Ready with Nits

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

For more information, please see the FAQ at

<https://trac.ietf.org/trac/gen/wiki/GenArtfaq>.

Document: draft-ietf-bess-evpn-na-flags-05
Reviewer: Robert Sparks
Review Date: 2020-08-18
IETF LC End Date: 2020-08-28
IESG Telechat date: Not scheduled for a telechat

Summary: Ready for publication as a Proposed Standard RFC but with nits to
address before publication

The protocol being defined seems fine, and the IANA considerations are well
constructed. I have a nagging feeling that there are new security concerns this
introduces, but haven't been able to identify anything specific. I appreciate
that the document discusses what happens when a bad-actor introduces
intentionally mis-configured flags.

Editorial Issues:

The Abstract is full of acronyms that are not universally understood, and it
buries the point of the document. Please consider rewriting to focus more
specifically on the goal of the draft (see the introduction in the shepherd's
writeup), keeping in mind that the abstract should make sense to people who
don't know yet what PE stands for. Much of what you currently have in the
Abstract can be left to the Introduction. I expect a  shorter (two or three
sentence) abstract will suit the document better.

In section 3.2: The list of three things in the list under "R and O Flags
processing" are all processing steps. But the list of 6 things under "I Flag
processing" are not all processing steps. Please change the list to only
include processing steps, and move the examples and commentary to regular
paragraphs after the processing has been specified.

Consider moving the third top-level bullet in 3.2 ("MUST be ignored") to be the
first bullet, and after that bullet say "otherwise".

Editorial Nits:

I suggest deleting "refers to" in the terminology sentences. In all cases you
mean "is" and you don't need to say "is".

The last phrase in the description of Bit 4 at the end of section 2 was
difficult to read. Consider breaking the sentence into two or more.

At the end of section 3.1, "does not have any impact on" is confusing. I think
you mean "does not change"? At ", including" the sentence becomes awkward. I
suggest breaking that into a separate sentence. Perhaps "Specifically the
procedures for advertising ... are not changed."




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From nobody Wed Aug 19 15:09:10 2020
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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 BGP Enabled ServiceS WG of the IETF.

        Title           : BGP Control Plane for the Network Service Header in Service Function Chaining
        Authors         : Adrian Farrel
                          John Drake
                          Eric Rosen
                          Jim Uttaro
                          Luay Jalil
	Filename        : draft-ietf-bess-nsh-bgp-control-plane-16.txt
	Pages           : 70
	Date            : 2020-08-19

Abstract:
   This document describes the use of BGP as a control plane for
   networks that support Service Function Chaining (SFC).  The document
   introduces a new BGP address family called the SFC Address Family
   Identifier / Subsequent Address Family Identifier (SFC AFI/SAFI) with
   two route types.  One route type is originated by a node to advertise
   that it hosts a particular instance of a specified service function.
   This route type also provides "instructions" on how to send a packet
   to the hosting node in a way that indicates that the service function
   has to be applied to the packet.  The other route type is used by a
   Controller to advertise the paths of "chains" of service functions,
   and to give a unique designator to each such path so that they can be
   used in conjunction with the Network Service Header defined in RFC
   8300.

   This document adopts the SFC architecture described in RFC 7665.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-nsh-bgp-control-plane/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-nsh-bgp-control-plane-16
https://datatracker.ietf.org/doc/html/draft-ietf-bess-nsh-bgp-control-plane-16

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-nsh-bgp-control-plane-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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Subject: Re: [bess] Murray Kucherawy's No Record on draft-ietf-bess-nsh-bgp-control-plane-15: (with COMMENT)
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Thanks Murray.

-16 fixes "L3VPN", "NRLI", and "EVPN"

I've also been back to check through Adam's Comment and fixed a few other
bits and pieces.

Best,
Adrian

-----Original Message-----
From: BESS <bess-bounces@ietf.org> On Behalf Of Murray Kucherawy via
Datatracker
Sent: 22 June 2020 00:56
To: The IESG <iesg@ietf.org>
Cc: slitkows.ietf@gmail.com; draft-ietf-bess-nsh-bgp-control-plane@ietf.org;
bess-chairs@ietf.org; bess@ietf.org
Subject: [bess] Murray Kucherawy's No Record on
draft-ietf-bess-nsh-bgp-control-plane-15: (with COMMENT)

Murray Kucherawy has entered the following ballot position for
draft-ietf-bess-nsh-bgp-control-plane-15: No Record

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


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-bess-nsh-bgp-control-plane/



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

As the IESG has rotated since this went up for a telechat, it's now shy of
the
needed ballot count to pass even when the DISCUSSes are cleared.  I'll
ballot
on this after I do a full review.

A quick comment now on -15:

Thanks for applying the feedback from my current and former co-ADs.
However,
Adam Roach's review requested that "L3VPN", "NRLI", and "EVPN" be expanded
on
first use, but that still hasn't been done.



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Subject: Re: [bess] Benjamin Kaduk's Discuss on draft-ietf-bess-nsh-bgp-control-plane-15: (with DISCUSS and COMMENT)
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Ben,

Thanks for the update.

> DISCUSS:
>
> I think we may still need some text changes to clarify how the joint =
list
> of SFIR-RD and SFIR Pool Identifier Extended Communities is =
constructed
> and interpreted, and potentially need to register an RD Type matching
> the other (TBD6+TBD7) values we allocate.

I think the clue here is that an RD is an extended community of type 0, =
1, or 2 with extended type always 0 (together, the RD type) while a pool =
id is a (new) extended community of type TBD6 with several extended =
types defined (1 and 2 in this document).

The whole extended community is included in the list, so it is always =
possible to tell the difference between an RD and a pool id.
You read the first two bytes and get 0:0, 1:0, or 2:0 for an RD and =
TBD6:1, or TBD6:2 for a pool id.

I'm adding...

                  <t>Note that an SFIR-RD can be distinguished from an =
SFIR Pool Identifier because they are both
                     BGP Extended Communities but they have different =
extended community types.</t>

> (I'm also not entirely clear how the IPv6 addresses interact with =
8-byte RDs.)

This is in your Comment on section 8.10 and addressed below.
Tl;dr They don't. RDs are encoded according to the operator's choice of =
numbering scheme and do not use v6 addresses.

> COMMENT:
>
> [retaining the note that I support Roman's Discuss]

Well, hoping that we have addressed that in -15, but waiting to hear =
from Roman.

> New comments on the -15
>
> Section 2.2
>
>   o  The Special Purpose SFT values range is assigned through =
Standards
>      Action.  Values in that range are used for special SFC operations
>      and do not apply to the types SF that may be placed on the SFC.
>
> I'm not sure I understand what it means to "place a SF on the SFC".
> Also, nit: missing "of"?

Nit is correct.
"Placed on" refers to the fact that an SFC is a computed sequence of SFs =
that form the chain.
Well, this should really say "SFP"
Clarified to...
               ...and do not apply to the types of SF that may form part =
of the SFP.

> o  The First Come First Served range tracks assignments of STF values
>      made by any party that defines an SF type.  Reference through an
>      Internet-Draft is desirable, but not required.
>
> Maybe "Internet-Draft or other stable written specification?"

I think there is nothing to be gained from driving people away from the =
IETF, so it's still our "desire" that an I-D would be used.

> Section 8.10
>
> The IPv6 examples seem to show RDs that are 127-bit IPv6 prefixes, but =
an
> 8-octet RD doesn't seem to have space for that?

Wow, this really is a mistake or embarrassing proportions. I shall claim =
clumsy editing while in a major grump about having to put in these =
examples. The fact is that *all* that changes in the IPv6 examples is =
the addresses of the nodes - the BGP advertisements are not changed at =
all and RDs remain as whatever 6 byte scheme the operator chooses to =
use.

I have added some text to help with this (as well as fixing the RDs) so =
that in Section 8 we have...

    <t>The SFFs advertise routes to the SFIs they support.  These =
advertisements
       contain Route Distinguishers that are set according to the =
network operator&apos;s
       configuration model.  In all of these IPv4 examples we use RDs of =
type 2 such that the
       available six octets are partitioned as four octets for the IPv4 =
address of the advertising
       SFF, and two octets that are a local index of the SFI.  This =
scheme is chosen purely for
       convenience of documentation, and an operator is totally free to =
use any other scheme so
       long as it conforms to the definitions of SFIR and SFPR in <xref =
target=3D"sfiRoutes" /> and
       <xref target=3D"sfpRoutes" />.</t>

    <t>Thus we see the following SFIRs advertised:</t>

...and in 8.10 we have...

    <t>The SFFs advertise routes to the SFIs they support.  These =
advertisements
       contain Route Distinguishers that are set according to the =
network operator&apos;s
       configuration model.  Note that in an IPv6 network, the RD is not =
large enough to=20
       contain the full IPv6 address as only six octets are available =
so, in all of these IPv6
       examples, we use RDs of type 2 such that the available six octets =
are partitioned as four
       octets for an IPv4 address of the advertising SFF, and two octets =
that are a local index=20
       of the SFI.  Furthermore, we have chosen an IPv6 addressing =
scheme so that the low order
       four octets of the IPv6 address match an IPv4 address of the =
advertising node.  This scheme
       is chosen purely for convenience of documentation, and an =
operator is totally free to use
       any other scheme so long as it conforms to the definitions of =
SFIR and SFPR in
       <xref target=3D"sfiRoutes" /> and <xref target=3D"sfpRoutes" =
/>.</t>

    <t>Observant readers will notice that this makes the BGP =
advertisements shown in these examples
       exactly the same as in the previous examples.  All that is =
different is that the advertising
       SFFs and Controller have IPv6 addresses.</t>

    <t>Thus we see the following SFIRs advertised:</t>

> Section 8.10.4
>
>         SFP4:  RD =3D 2001:db8::198:51:100:1/104, SPI =3D 18,
>                [SI =3D 255, SFT =3D 41, RD =3D 2001:db8::192:0:2:1/1],
>                [SI =3D 250, {SFT =3D 43, RD =3D 2001:db8::192:0:2:2/2,
>                            SFT =3D 44, RD =3D 2001:db8::192:0:2:3/8 } =
]
>   [...]
>   When the packets are returned to SFF1 by the SFI the SI will be
>   decreased to 250 for the next hop.  SFF1 now has a free choice of
>   next hop SFF to execute the next hop in the path selecting between
>   all SFF2 that support an SF of type 43 and SFF3 that supports an SF
>   of type 44.  These may be completely different functions that are to
>
> I see a specific (nonzero) RD for SFT=3D43, so I don't understand why =
this is a
> choice of "all SFF2 that support an SF of type 43".

That is s/SFF2/SFFs/  :o(
We caught that previously in 8.3 but didn't propagate the fix.

> Section 9
>
> You say that RFC 4760 has additional relevant security measures but =
I'm not
> sure which measures you're referring to (having skimmed all of 4760).

Well, yes, erm (looks for excuse, but can't find one quickly). I think =
we just thought, "Well, we're talking about mBGP so all of the security =
stuff for that must apply," and didn't look further.

Changed this to:
    <t>Additionally, this document depends on other documents that =
specify BGP
       Multiprotocol Extensions and the documents that define the =
attributes that
       are carried by BGP UPDATEs of the SFC AFI/SAFI.  <xref =
target=3D"RFC4760" />=20
       observes that the use of AFI/SAFI does not change the underlying =
security issues
       inherent in the existing BGP.  Relevant additional security =
measures are
       considered in <xref target=3D"I-D.ietf-idr-tunnel-encaps" />.</t>

>   This document does not fundamentally change the security behavior of
>   BGP deployments which depend considerably on the network operator's
>
> nit(?): maybe comma before "which"?

OK

>   perception of risk in their network.  It may be observed that the
>   application of the mechanisms described in this document are scoped
>   to a single domain as implied by [RFC8300] noted in Section 2.1.
>
> I can't tell if this means section 2.1 of 8300 or this document.

It's obvious from the XML =F0=9F=98=8A
Yup, fixed to clarify "of this document"


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Subject: Re: [bess] Alvaro Retana's Discuss on draft-ietf-bess-nsh-bgp-control-plane-13: (with DISCUSS and COMMENT)
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Just coming back to you on this one, Alvaro....

> I'm not too keen on the use of treat-as-withdraw, specially because
> the sender doesn't know that something happened.  Knowing that the
> communication is direct between the controller/classifier, I would
> like to propose thinking of multiple communities as interfering with
> the new one (see =C2=A77.7/rfc5575bis).  This would result in this =
document
> specifying something like this:
>
> OLD>
>   ...: the inclusion of the "Flow Specification for SFC Classifiers" =
action
>   extended community along with any other action MUST be treated by an
>   implementation of this specification as an error which SHOULD result =
in the
>   Flow Specification UPDATE message being handled as Treat-as-withdraw
>   according to Section 2.
>
> NEW>
>   ....  The "Flow Specification for SFC Classifiers" extended =
community
>   interferes with all other Traffic Filtering Actions.  Only the SFC
>   Classifiers action MUST be considered and all others ignored.
>
> If you *really* want to treat-as-withdraw, then here's my suggested
> text to be in line with rfc5575bis:
>
> NEW>
>   ...: a "Flow Specification for SFC Classifiers" Traffic Filtering =
Action
>   Extended Community advertised with any other Traffic Filtering =
Action
>   Extended Community MUST be treated as malformed.

We settled on the second of these options.

Best,
Adrian


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Date: Wed, 19 Aug 2020 22:09:58 -0700
From: Benjamin Kaduk <kaduk@mit.edu>
To: Adrian Farrel <adrian@olddog.co.uk>
Cc: "'The IESG'" <iesg@ietf.org>, slitkows.ietf@gmail.com, draft-ietf-bess-nsh-bgp-control-plane@ietf.org, bess-chairs@ietf.org, bess@ietf.org
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Subject: Re: [bess] Benjamin Kaduk's Discuss on draft-ietf-bess-nsh-bgp-control-plane-15: (with DISCUSS and COMMENT)
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Hi Adrian,

On Wed, Aug 19, 2020 at 11:11:10PM +0100, Adrian Farrel wrote:
> Ben,
> 
> Thanks for the update.
> 
> > DISCUSS:
> >
> > I think we may still need some text changes to clarify how the joint list
> > of SFIR-RD and SFIR Pool Identifier Extended Communities is constructed
> > and interpreted, and potentially need to register an RD Type matching
> > the other (TBD6+TBD7) values we allocate.
> 
> I think the clue here is that an RD is an extended community of type 0, 1, or 2 with extended type always 0 (together, the RD type) while a pool id is a (new) extended community of type TBD6 with several extended types defined (1 and 2 in this document).
> 
> The whole extended community is included in the list, so it is always possible to tell the difference between an RD and a pool id.
> You read the first two bytes and get 0:0, 1:0, or 2:0 for an RD and TBD6:1, or TBD6:2 for a pool id.
> 
> I'm adding...
> 
>                   <t>Note that an SFIR-RD can be distinguished from an SFIR Pool Identifier because they are both
>                      BGP Extended Communities but they have different extended community types.</t>

My apologies for being so dense, but I'm still having a bit of trouble with
this.

To be clear, what you describe sounds clear and makes perfect sense, but
I'm having trouble mapping it up to the specs and IANA registries.  For
example, if the RD is encoded as 0:0, 1:0, or 2:0, then wouldn't the
extended community sub-type value 0 be allocated in the corresponding
registries?

I see where RFC 4360 defines the extended communities attribute with type
high and (optional) type low, and specifically how types 0, 1, and 2 are
specified as extended transitive communities for AS-specific,
IPv4-address-specific, and opaque extended communities, respectively, with
the low-order octet used to indicate sub-types.  I also see RFC 4360 define
the Route Target community with low-order octet 0x02 (for all three values
mentioned for the high-order type byte).  (No mention of Route
Distinguishers or low-order octet 0x00, yet, but more on that below.)

I also see those types 0x00, 0x01, and 0x02 listed at the BGP Transitive
Extended Community Types registry at
https://www.iana.org/assignments/bgp-extended-communities/bgp-extended-communities.xhtml#transitive
, and when I go to find (e.g) the "Transitive Two-octet AS-Specific Extended
Community Sub-Types" registry indicated for type value 0x00, I end up at
https://www.iana.org/assignments/bgp-extended-communities/bgp-extended-communities.xhtml#trans-two-octet-as
and see that sub-type value 0x00 is "Unassigned".  For the IPv4 and opaque
sub-type registries 0x00 is also listed as Unassigned, but "Unassigned
(deprecated)", interestingly enough.

Getting back to the Route Distinguisher topic, I see RFC 4364 discuss that
RDs are encoded as a 2-byte type field and 6-byte value, defining the
format for types 0, 1, and 2.  But with no mention of high or low bytes
within the type, I assume that those type values are 0x0000, 0x0001, and
0x0002, as opposed to the 0x0200 that you describe above.  I also see RFC
4364 say that the Route Targets (which AFAICT are the RFC 4360 transitive
extended communities with type 0:2, 1:2, and 2:2) "are structured similarly
to the RDs", but the only discussion of "extended communit{y,ies}" I see in
RFC 4364 relate to RTs, "additional types" that may be defined, and Route
Origin.  Specifically, "extended community" does *not* seem to be used in
conjunction with RDs.

So, while I'm willing to believe that everything is fine and I'm just
confused about how it works, I still don't see how the pieces line up.
Hopefully the above discussion helps to clarify what I'm stuck up on.

> > (I'm also not entirely clear how the IPv6 addresses interact with 8-byte RDs.)
> 
> This is in your Comment on section 8.10 and addressed below.

(Yes.)

> Tl;dr They don't. RDs are encoded according to the operator's choice of numbering scheme and do not use v6 addresses.
> 
> > COMMENT:
> >
> > [retaining the note that I support Roman's Discuss]
> 
> Well, hoping that we have addressed that in -15, but waiting to hear from Roman.
> 
> > New comments on the -15
> >
> > Section 2.2
> >
> >   o  The Special Purpose SFT values range is assigned through Standards
> >      Action.  Values in that range are used for special SFC operations
> >      and do not apply to the types SF that may be placed on the SFC.
> >
> > I'm not sure I understand what it means to "place a SF on the SFC".
> > Also, nit: missing "of"?
> 
> Nit is correct.
> "Placed on" refers to the fact that an SFC is a computed sequence of SFs that form the chain.

Ah, "placed on [...] the chain", of course.  Sorry for missing that...

> Well, this should really say "SFP"
> Clarified to...
>                ...and do not apply to the types of SF that may form part of the SFP.

... but this seems better.

> > o  The First Come First Served range tracks assignments of STF values
> >      made by any party that defines an SF type.  Reference through an
> >      Internet-Draft is desirable, but not required.
> >
> > Maybe "Internet-Draft or other stable written specification?"
> 
> I think there is nothing to be gained from driving people away from the IETF, so it's still our "desire" that an I-D would be used.
> 
> > Section 8.10
> >
> > The IPv6 examples seem to show RDs that are 127-bit IPv6 prefixes, but an
> > 8-octet RD doesn't seem to have space for that?
> 
> Wow, this really is a mistake or embarrassing proportions. I shall claim clumsy editing while in a major grump about having to put in these examples. The fact is that *all* that changes in the IPv6 examples is the addresses of the nodes - the BGP advertisements are not changed at all and RDs remain as whatever 6 byte scheme the operator chooses to use.
> 
> I have added some text to help with this (as well as fixing the RDs) so that in Section 8 we have...
> 
>     <t>The SFFs advertise routes to the SFIs they support.  These advertisements
>        contain Route Distinguishers that are set according to the network operator&apos;s
>        configuration model.  In all of these IPv4 examples we use RDs of type 2 such that the
>        available six octets are partitioned as four octets for the IPv4 address of the advertising
>        SFF, and two octets that are a local index of the SFI.  This scheme is chosen purely for
>        convenience of documentation, and an operator is totally free to use any other scheme so
>        long as it conforms to the definitions of SFIR and SFPR in <xref target="sfiRoutes" /> and
>        <xref target="sfpRoutes" />.</t>
> 
>     <t>Thus we see the following SFIRs advertised:</t>
> 
> ...and in 8.10 we have...
> 
>     <t>The SFFs advertise routes to the SFIs they support.  These advertisements
>        contain Route Distinguishers that are set according to the network operator&apos;s
>        configuration model.  Note that in an IPv6 network, the RD is not large enough to 
>        contain the full IPv6 address as only six octets are available so, in all of these IPv6
>        examples, we use RDs of type 2 such that the available six octets are partitioned as four
>        octets for an IPv4 address of the advertising SFF, and two octets that are a local index 
>        of the SFI.  Furthermore, we have chosen an IPv6 addressing scheme so that the low order
>        four octets of the IPv6 address match an IPv4 address of the advertising node.  This scheme
>        is chosen purely for convenience of documentation, and an operator is totally free to use
>        any other scheme so long as it conforms to the definitions of SFIR and SFPR in
>        <xref target="sfiRoutes" /> and <xref target="sfpRoutes" />.</t>
> 
>     <t>Observant readers will notice that this makes the BGP advertisements shown in these examples
>        exactly the same as in the previous examples.  All that is different is that the advertising
>        SFFs and Controller have IPv6 addresses.</t>

That does look like it will help; thanks!

>     <t>Thus we see the following SFIRs advertised:</t>
> 
> > Section 8.10.4
> >
> >         SFP4:  RD = 2001:db8::198:51:100:1/104, SPI = 18,
> >                [SI = 255, SFT = 41, RD = 2001:db8::192:0:2:1/1],
> >                [SI = 250, {SFT = 43, RD = 2001:db8::192:0:2:2/2,
> >                            SFT = 44, RD = 2001:db8::192:0:2:3/8 } ]
> >   [...]
> >   When the packets are returned to SFF1 by the SFI the SI will be
> >   decreased to 250 for the next hop.  SFF1 now has a free choice of
> >   next hop SFF to execute the next hop in the path selecting between
> >   all SFF2 that support an SF of type 43 and SFF3 that supports an SF
> >   of type 44.  These may be completely different functions that are to
> >
> > I see a specific (nonzero) RD for SFT=43, so I don't understand why this is a
> > choice of "all SFF2 that support an SF of type 43".
> 
> That is s/SFF2/SFFs/  :o(
> We caught that previously in 8.3 but didn't propagate the fix.

Ah, makes much more sense that way, thanks.

> > Section 9
> >
> > You say that RFC 4760 has additional relevant security measures but I'm not
> > sure which measures you're referring to (having skimmed all of 4760).
> 
> Well, yes, erm (looks for excuse, but can't find one quickly). I think we just thought, "Well, we're talking about mBGP so all of the security stuff for that must apply," and didn't look further.
> 
> Changed this to:
>     <t>Additionally, this document depends on other documents that specify BGP
>        Multiprotocol Extensions and the documents that define the attributes that
>        are carried by BGP UPDATEs of the SFC AFI/SAFI.  <xref target="RFC4760" /> 
>        observes that the use of AFI/SAFI does not change the underlying security issues
>        inherent in the existing BGP.  Relevant additional security measures are
>        considered in <xref target="I-D.ietf-idr-tunnel-encaps" />.</t>

Thanks.

> >   This document does not fundamentally change the security behavior of
> >   BGP deployments which depend considerably on the network operator's
> >
> > nit(?): maybe comma before "which"?
> 
> OK
> 
> >   perception of risk in their network.  It may be observed that the
> >   application of the mechanisms described in this document are scoped
> >   to a single domain as implied by [RFC8300] noted in Section 2.1.
> >
> > I can't tell if this means section 2.1 of 8300 or this document.
> 
> It's obvious from the XML ðŸ˜Š

"v3 XML will fix it, of course"

> Yup, fixed to clarify "of this document"

Thanks for all the explanations and updates, and sorry again for my
continued confusion about the types.

-Ben


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From: John E Drake <jdrake@juniper.net>
To: Benjamin Kaduk <kaduk@mit.edu>, Adrian Farrel <adrian@olddog.co.uk>
CC: 'The IESG' <iesg@ietf.org>, "slitkows.ietf@gmail.com" <slitkows.ietf@gmail.com>, "draft-ietf-bess-nsh-bgp-control-plane@ietf.org" <draft-ietf-bess-nsh-bgp-control-plane@ietf.org>, "bess-chairs@ietf.org" <bess-chairs@ietf.org>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: [bess] Benjamin Kaduk's Discuss on draft-ietf-bess-nsh-bgp-control-plane-15: (with DISCUSS and COMMENT)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/BXEyZMIvJOk2yu6LntHgeJii-Gk>
Subject: Re: [bess] Benjamin Kaduk's Discuss on draft-ietf-bess-nsh-bgp-control-plane-15: (with DISCUSS and COMMENT)
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Date: Thu, 20 Aug 2020 06:48:49 -0700
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Cc: Adrian Farrel <adrian@olddog.co.uk>, "'The IESG'" <iesg@ietf.org>, "slitkows.ietf@gmail.com" <slitkows.ietf@gmail.com>, "draft-ietf-bess-nsh-bgp-control-plane@ietf.org" <draft-ietf-bess-nsh-bgp-control-plane@ietf.org>,  "bess-chairs@ietf.org" <bess-chairs@ietf.org>, "bess@ietf.org" <bess@ietf.org>
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Subject: Re: [bess] Benjamin Kaduk's Discuss on draft-ietf-bess-nsh-bgp-control-plane-15: (with DISCUSS and COMMENT)
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Hi John,

On Thu, Aug 20, 2020 at 01:43:34PM +0000, John E Drake wrote:
> Ben,
> 
> An RD is encoded using the same format as an extended community but it isn't an extended community.  Rather, it is actually part of the NLRI.  The first octet is always zero whereas the first octet of an SFIR Pool Identifier extended community will always be non-zero (TBD6).

Thanks for helping clarify.  I'm not seeing what guarantees that the first
octet of the RD is always zero going forward, though -- I see
https://www.iana.org/assignments/route-distinguisher-types/route-distinguisher-types.xhtml
that lists values 3-65534 as "Unassigned".  If we are going to rely on
non-overlap between the extended community types used for this document and
RD types in general, don't we need to mark some values in one (or both!)
registry as Reserved with a reference to [this-document]?

-Ben


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From: John E Drake <jdrake@juniper.net>
To: Benjamin Kaduk <kaduk@mit.edu>
CC: Adrian Farrel <adrian@olddog.co.uk>, 'The IESG' <iesg@ietf.org>, "slitkows.ietf@gmail.com" <slitkows.ietf@gmail.com>, "draft-ietf-bess-nsh-bgp-control-plane@ietf.org" <draft-ietf-bess-nsh-bgp-control-plane@ietf.org>, "bess-chairs@ietf.org" <bess-chairs@ietf.org>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: [bess] Benjamin Kaduk's Discuss on draft-ietf-bess-nsh-bgp-control-plane-15: (with DISCUSS and COMMENT)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/oFRrnIh00Pf6zQozvWAfb15b46Y>
Subject: Re: [bess] Benjamin Kaduk's Discuss on draft-ietf-bess-nsh-bgp-control-plane-15: (with DISCUSS and COMMENT)
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Ben,

Perhaps, although AFAIK the three values defined in RFC 4364 have not been =
supplemented since it was published in 2006.

Yours Irrespectively,

John


Juniper Business Use Only

> -----Original Message-----
> From: Benjamin Kaduk <kaduk@mit.edu>
> Sent: Thursday, August 20, 2020 9:49 AM
> To: John E Drake <jdrake@juniper.net>
> Cc: Adrian Farrel <adrian@olddog.co.uk>; 'The IESG' <iesg@ietf.org>;
> slitkows.ietf@gmail.com; draft-ietf-bess-nsh-bgp-control-plane@ietf.org; =
bess-
> chairs@ietf.org; bess@ietf.org
> Subject: Re: [bess] Benjamin Kaduk's Discuss on draft-ietf-bess-nsh-bgp-c=
ontrol-
> plane-15: (with DISCUSS and COMMENT)
>=20
> [External Email. Be cautious of content]
>=20
>=20
> Hi John,
>=20
> On Thu, Aug 20, 2020 at 01:43:34PM +0000, John E Drake wrote:
> > Ben,
> >
> > An RD is encoded using the same format as an extended community but it =
isn't
> an extended community.  Rather, it is actually part of the NLRI.  The fir=
st octet is
> always zero whereas the first octet of an SFIR Pool Identifier extended
> community will always be non-zero (TBD6).
>=20
> Thanks for helping clarify.  I'm not seeing what guarantees that the firs=
t octet of
> the RD is always zero going forward, though -- I see
> https://urldefense.com/v3/__https://www.iana.org/assignments/route-
> distinguisher-types/route-distinguisher-types.xhtml__;!!NEt6yMaO-
> gk!XaVl3FGXv5cbCKTxNwk3iDLsewVmqJqBOHl8SCveaWdUk0BtkI2cbqt92LXsa5E
> $
> that lists values 3-65534 as "Unassigned".  If we are going to rely on no=
n-overlap
> between the extended community types used for this document and RD types =
in
> general, don't we need to mark some values in one (or both!) registry as
> Reserved with a reference to [this-document]?
>=20
> -Ben


From nobody Thu Aug 20 07:33:32 2020
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From: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>
To: "draft-wang-bess-evpn-context-label@ietf.org" <draft-wang-bess-evpn-context-label@ietf.org>
CC: "bess@ietf.org" <bess@ietf.org>, Michael Gorokhovsky <Michael.Gorokhovsky@rbbn.com>
Thread-Topic: Hub-and-spoke support in EVPN: RFC 8317 vs. draft-wang-bess-evpn-context-label-04
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Subject: [bess] Hub-and-spoke support in EVPN: RFC 8317 vs. draft-wang-bess-evpn-context-label-04
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Dear authors of draft-wang-bess-evpn-context-label-04,

Section 2 "Problem Statement" of draft-wang-bess-evpn-context-label-04 stat=
es that " MPLS EVPN can't support hub/spoke use case, where the spoke PEs c=
an only connect to each other through the hub PE.  Especially when at least=
 two of the spoke PEs are connected to a common route reflector".

I have to admit that I do not understand why support of the generic E-Tree =
functionality in EVPN defined in RFC 8317<https://tools.ietf.org/html/rfc83=
17> is not sufficient for handling this use case.

In particular I do not see why connection of Spoke PEs to a common RR affec=
ts the EVPN behavior (or L3vPN Hub-and-Spoke VPN behavior as defined in Sec=
tion 4.3.5 of RFC 4364<https://tools.ietf.org/html/rfc4364#section-4.3.5>) =
in any way.

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com


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<p class=3D"MsoNormal">Dear authors of draft-wang-bess-evpn-context-label-0=
4,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Section 2 &#8220;Problem Statement&#8221; of draft-w=
ang-bess-evpn-context-label-04 states that &#8220;
<span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">MPLS E=
VPN can't support hub/spoke use case, where the spoke PEs can only connect =
to each other through the hub PE.&nbsp; Especially when at least two of the=
 spoke PEs are connected to a common route reflector</span>&#8221;.<o:p></o=
:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I have to admit that I do not understand why support=
 of the generic E-Tree functionality in EVPN defined in
<a href=3D"https://tools.ietf.org/html/rfc8317">RFC 8317</a> is not suffici=
ent for handling this use case.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In particular I do not see why connection of Spoke P=
Es to a common RR affects the EVPN behavior (or L3vPN Hub-and-Spoke VPN beh=
avior as defined in
<a href=3D"https://tools.ietf.org/html/rfc4364#section-4.3.5">Section 4.3.5=
 of RFC 4364</a>) in any way.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p></=
p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: +972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; +972-549266302<o=
:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; Alexander.Vainshtein@ecitele.com<=
o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>


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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>, "draft-wang-bess-evpn-context-label@ietf.org" <draft-wang-bess-evpn-context-label@ietf.org>
CC: Michael Gorokhovsky <Michael.Gorokhovsky@rbbn.com>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: Hub-and-spoke support in EVPN: RFC 8317 vs. draft-wang-bess-evpn-context-label-04
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Date: Thu, 20 Aug 2020 14:46:26 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/WXmC5-s-CqnxZkZdd67bqV_1uoY>
Subject: Re: [bess] Hub-and-spoke support in EVPN: RFC 8317 vs. draft-wang-bess-evpn-context-label-04
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Hub and spoke EVPN and E-tree are different.

However, draft-ietf-bess-evpn-virtual-hub should address the following two =
at least:

   *  MPLS EVPN can't support hub/spoke usecase, where the spoke PEs can
      only connect to each other through the hub PE.  Especially when at
      least two of the spoke PEs are connected to a common route
      reflector.

   *  MPLS EVPN can't work as an AR-REPLICATOR.  Because the AR-
      REPLICATOR will apply replication for the ingress AR-LEAF too.
      But a packet shoud not be sent back to the AR-LEAF where it is
      received from.

Jeffrey



Juniper Business Use Only
From: BESS <bess-bounces@ietf.org> On Behalf Of Alexander Vainshtein
Sent: Thursday, August 20, 2020 9:36 AM
To: draft-wang-bess-evpn-context-label@ietf.org
Cc: Michael Gorokhovsky <Michael.Gorokhovsky@rbbn.com>; bess@ietf.org
Subject: [bess] Hub-and-spoke support in EVPN: RFC 8317 vs. draft-wang-bess=
-evpn-context-label-04

[External Email. Be cautious of content]

Dear authors of draft-wang-bess-evpn-context-label-04,

Section 2 "Problem Statement" of draft-wang-bess-evpn-context-label-04 stat=
es that " MPLS EVPN can't support hub/spoke use case, where the spoke PEs c=
an only connect to each other through the hub PE.  Especially when at least=
 two of the spoke PEs are connected to a common route reflector".

I have to admit that I do not understand why support of the generic E-Tree =
functionality in EVPN defined in RFC 8317<https://urldefense.com/v3/__https=
:/tools.ietf.org/html/rfc8317__;!!NEt6yMaO-gk!QRZOPg7Or-dqLm0vGwqM2vyyPBISC=
yDo4uu4Jq2MEDW8fuSMZV6tLNIvZnaam81J$> is not sufficient for handling this u=
se case.

In particular I do not see why connection of Spoke PEs to a common RR affec=
ts the EVPN behavior (or L3vPN Hub-and-Spoke VPN behavior as defined in Sec=
tion 4.3.5 of RFC 4364<https://urldefense.com/v3/__https:/tools.ietf.org/ht=
ml/rfc4364*section-4.3.5__;Iw!!NEt6yMaO-gk!QRZOPg7Or-dqLm0vGwqM2vyyPBISCyDo=
4uu4Jq2MEDW8fuSMZV6tLNIvZunniYWF$>) in any way.

Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com<mailto:Alexander.Vainshtein@ecite=
le.com>


________________________________
Notice: This e-mail together with any attachments may contain information o=
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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hub and spoke EVPN and E-tree are different.<o:p></o=
:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">However, draft-ietf-bess-evpn-virtual-hub should add=
ress the following two at least:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:14.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; *&nbsp; MPLS EVPN can't support h=
ub/spoke usecase, where the spoke PEs can<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:14.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; only connect to=
 each other through the hub PE.&nbsp; Especially when at<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:14.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; least two of th=
e spoke PEs are connected to a common route<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:14.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; reflector.<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:14.0pt;font-family:&quot;Co=
urier New&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:14.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; *&nbsp; MPLS EVPN can't work as a=
n AR-REPLICATOR.&nbsp; Because the AR-<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:14.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; REPLICATOR will=
 apply replication for the ingress AR-LEAF too.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:14.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; But a packet sh=
oud not be sent back to the AR-LEAF where it is<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:14.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received from.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Jeffrey<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"msipfooter30b3d538" align=3D"center" style=3D"margin:0in;text-a=
lign:center">
<span style=3D"font-size:7.0pt;color:black">Juniper Business Use Only</span=
><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> BESS &lt;bess-bounces@ietf.org&gt; <b>O=
n Behalf Of </b>
Alexander Vainshtein<br>
<b>Sent:</b> Thursday, August 20, 2020 9:36 AM<br>
<b>To:</b> draft-wang-bess-evpn-context-label@ietf.org<br>
<b>Cc:</b> Michael Gorokhovsky &lt;Michael.Gorokhovsky@rbbn.com&gt;; bess@i=
etf.org<br>
<b>Subject:</b> [bess] Hub-and-spoke support in EVPN: RFC 8317 vs. draft-wa=
ng-bess-evpn-context-label-04<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"line-height:12.0pt;background:#FFEB9C"><b><=
span style=3D"font-size:10.5pt;font-family:&quot;Lato&quot;,sans-serif;colo=
r:black">[External Email. Be cautious of content]<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">Dear authors of draft-wang-bess-evpn-context-label-0=
4,<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Section 2 &#8220;Problem Statement&#8221; of draft-w=
ang-bess-evpn-context-label-04 states that &#8220;
<span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;">MPLS E=
VPN can't support hub/spoke use case, where the spoke PEs can only connect =
to each other through the hub PE.&nbsp; Especially when at least two of the=
 spoke PEs are connected to a common route reflector</span>&#8221;.<o:p></o=
:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">I have to admit that I do not understand why support=
 of the generic E-Tree functionality in EVPN defined in
<a href=3D"https://urldefense.com/v3/__https:/tools.ietf.org/html/rfc8317__=
;!!NEt6yMaO-gk!QRZOPg7Or-dqLm0vGwqM2vyyPBISCyDo4uu4Jq2MEDW8fuSMZV6tLNIvZnaa=
m81J$">
RFC 8317</a> is not sufficient for handling this use case.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">In particular I do not see why connection of Spoke P=
Es to a common RR affects the EVPN behavior (or L3vPN Hub-and-Spoke VPN beh=
avior as defined in
<a href=3D"https://urldefense.com/v3/__https:/tools.ietf.org/html/rfc4364*s=
ection-4.3.5__;Iw!!NEt6yMaO-gk!QRZOPg7Or-dqLm0vGwqM2vyyPBISCyDo4uu4Jq2MEDW8=
fuSMZV6tLNIvZunniYWF$">
Section 4.3.5 of RFC 4364</a>) in any way.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p></=
p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Office: +972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; +972-549266302<o=
:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vains=
htein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
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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 BGP Enabled ServiceS WG of the IETF.

        Title           : Controller Based BGP Multicast Signaling
        Authors         : Zhaohui Zhang
                          Robert Raszuk
                          Dante Pacella
                          Arkadiy Gulko
	Filename        : draft-ietf-bess-bgp-multicast-controller-04.txt
	Pages           : 19
	Date            : 2020-08-20

Abstract:
   This document specifies a way that one or more centralized
   controllers can use BGP to set up a multicast distribution tree in a
   network.  In the case of labeled tree, the labels are assigned by the
   controllers either from the controllers' local label spaces, or from
   a common Segment Routing Global Block (SRGB), or from each routers
   Segment Routing Local Block (SRLB) that the controllers learn.  In
   case of labeled unidirectional tree and label allocation from the
   common SRGB or from the controllers' local spaces, a single common
   label can be used for all routers on the tree to send and receive
   traffic with.  Since the controllers calculate the trees, they can
   use sophisticated algorithms and constraints to achieve traffic
   engineering.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-bgp-multicast-controller/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-bgp-multicast-controller-04
https://datatracker.ietf.org/doc/html/draft-ietf-bess-bgp-multicast-controller-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-bgp-multicast-controller-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: Alvaro Retana <aretana.ietf@gmail.com>
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References: <157672423820.4788.15963554106411963869.idtracker@ietfa.amsl.com> <00a301d63787$89a36db0$9cea4910$@olddog.co.uk> <CAMMESswL8erpQfAs5rqv=y+pGWkWpjsUuWNOq5VzYVabd7JMJA@mail.gmail.com> <067101d652ef$208c8630$61a59290$@olddog.co.uk> <CAMMESsyNjmR2AdSq2NtJGQ-=ZDoc2XeGAGEVwPpTDyWvOyBR6g@mail.gmail.com> <03b001d656f4$3c1d9930$b458cb90$@olddog.co.uk> <05de01d67675$ae7b5da0$0b7218e0$@olddog.co.uk>
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To: adrian@olddog.co.uk, The IESG <iesg@ietf.org>
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Subject: Re: [bess] Alvaro Retana's Discuss on draft-ietf-bess-nsh-bgp-control-plane-13: (with DISCUSS and COMMENT)
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--000000000000954a8705ad54fc7f
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Thanks Adrian!


I looked at the diffs and reviewed our exchange.

I=E2=80=99m clearing my DISCUSS.

Alvaro.

On August 19, 2020 at 6:11:27 PM, Adrian Farrel (adrian@olddog.co.uk) wrote=
:

Just coming back to you on this one, 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 style=3D"font-family:Helve=
tica,Arial;font-size:13px">Thanks Adrian!</div><div style=3D"font-family:He=
lvetica,Arial;font-size:13px"><br></div><div style=3D"font-family:Helvetica=
,Arial;font-size:13px"><br></div><div style=3D"font-family:Helvetica,Arial;=
font-size:13px">I looked at the diffs and reviewed our exchange.</div><div =
style=3D"font-family:Helvetica,Arial;font-size:13px"><br></div><div style=
=3D"font-family:Helvetica,Arial;font-size:13px">I=E2=80=99m clearing my DIS=
CUSS.</div><div style=3D"font-family:Helvetica,Arial;font-size:13px"><br></=
div><div style=3D"font-family:Helvetica,Arial;font-size:13px">Alvaro.</div>=
 <br><p class=3D"airmail_on">On August 19, 2020 at 6:11:27 PM, Adrian Farre=
l (<a href=3D"mailto:adrian@olddog.co.uk">adrian@olddog.co.uk</a>) wrote:</=
p> <blockquote type=3D"cite" class=3D"clean_bq"><span><div>Just coming back=
 to you on this one, Alvaro.... </div></span></blockquote> <div class=3D"gm=
ail_signature"></div></body></html>

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Subject: Re: [bess] Last Call: <draft-ietf-bess-evpn-na-flags-05.txt> (Propagation of ARP/ND Flags in EVPN) to Proposed Standard
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Subject: Re: [bess] Hub-and-spoke support in EVPN: RFC 8317 vs.draft-wang-bess-evpn-context-label-04
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Subject: [bess] I-D Action: draft-ietf-bess-nsh-bgp-control-plane-17.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 BGP Enabled ServiceS WG of the IETF.

        Title           : BGP Control Plane for the Network Service Header in Service Function Chaining
        Authors         : Adrian Farrel
                          John Drake
                          Eric Rosen
                          Jim Uttaro
                          Luay Jalil
	Filename        : draft-ietf-bess-nsh-bgp-control-plane-17.txt
	Pages           : 71
	Date            : 2020-08-21

Abstract:
   This document describes the use of BGP as a control plane for
   networks that support Service Function Chaining (SFC).  The document
   introduces a new BGP address family called the SFC Address Family
   Identifier / Subsequent Address Family Identifier (SFC AFI/SAFI) with
   two route types.  One route type is originated by a node to advertise
   that it hosts a particular instance of a specified service function.
   This route type also provides "instructions" on how to send a packet
   to the hosting node in a way that indicates that the service function
   has to be applied to the packet.  The other route type is used by a
   Controller to advertise the paths of "chains" of service functions,
   and to give a unique designator to each such path so that they can be
   used in conjunction with the Network Service Header defined in RFC
   8300.

   This document adopts the SFC architecture described in RFC 7665.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-nsh-bgp-control-plane/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-nsh-bgp-control-plane-17
https://datatracker.ietf.org/doc/html/draft-ietf-bess-nsh-bgp-control-plane-17

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-nsh-bgp-control-plane-17


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: [bess] I-D Action: draft-ietf-bess-nsh-bgp-control-plane-18.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 BGP Enabled ServiceS WG of the IETF.

        Title           : BGP Control Plane for the Network Service Header in Service Function Chaining
        Authors         : Adrian Farrel
                          John Drake
                          Eric Rosen
                          Jim Uttaro
                          Luay Jalil
	Filename        : draft-ietf-bess-nsh-bgp-control-plane-18.txt
	Pages           : 71
	Date            : 2020-08-21

Abstract:
   This document describes the use of BGP as a control plane for
   networks that support Service Function Chaining (SFC).  The document
   introduces a new BGP address family called the SFC Address Family
   Identifier / Subsequent Address Family Identifier (SFC AFI/SAFI) with
   two route types.  One route type is originated by a node to advertise
   that it hosts a particular instance of a specified service function.
   This route type also provides "instructions" on how to send a packet
   to the hosting node in a way that indicates that the service function
   has to be applied to the packet.  The other route type is used by a
   Controller to advertise the paths of "chains" of service functions,
   and to give a unique designator to each such path so that they can be
   used in conjunction with the Network Service Header defined in RFC
   8300.

   This document adopts the SFC architecture described in RFC 7665.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-nsh-bgp-control-plane/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-nsh-bgp-control-plane-18
https://datatracker.ietf.org/doc/html/draft-ietf-bess-nsh-bgp-control-plane-18

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-nsh-bgp-control-plane-18


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: Gyan Mishra <hayabusagsm@gmail.com>
Date: Sat, 22 Aug 2020 02:21:29 -0400
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All,

I have updated the draft and have added Jeff Tantsura as co-author to the
draft.

Thank you

Gyan

---------- Forwarded message ---------
From: Mishra, Gyan S <gyan.s.mishra@verizon.com>
Date: Sat, Aug 22, 2020 at 2:22 AM
Subject: Fwd: [E] New Version Notification for
draft-mishra-bess-ipv4nlri-ipv6nh-use-cases-03.txt
To: Hayabusanew <hayabusagsm@gmail.com>




---------- Forwarded message ---------
From: <internet-drafts@ietf.org>
Date: Sat, Aug 22, 2020 at 2:20 AM
Subject: [E] New Version Notification for
draft-mishra-bess-ipv4nlri-ipv6nh-use-cases-03.txt
To: Jeff Tantsura <jefftant.ietf@gmail.com>, Gyan Mishra <
gyan.s.mishra@verizon.com>, Mankamana Mishra <mankamis@cisco.com>



A new version of I-D, draft-mishra-bess-ipv4nlri-ipv6nh-use-cases-03.txt
has been successfully submitted by Gyan Mishra and posted to the
IETF repository.

Name:           draft-mishra-bess-ipv4nlri-ipv6nh-use-cases
Revision:       03
Title:          IPv4 NLRI with IPv6 Next Hop Use Cases
Document date:  2020-08-21
Group:          Individual Submission
Pages:          15
URL:
https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.org_interne=
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Abstract:
   As Enterprises and Service Providers upgrade their brown field or
   green field MPLS/SR core to an IPv6 transport such as MPLS LDPv6, SR-
   MPLSv6 or SRv6, Multiprotocol BGP (MP-BGP)now plays an important role
   in the transition of the core from IPv4 to IPv6 being able to
   continue to support legacy IPv4, VPN-IPv4, and Multicast VPN IPv4
   customers.

   Multiprotocol BGP (MP-BGP) specifies that the set of usable next-hop
   address families is determined by the Address Family Identifier (AFI)
   and the Subsequent Address Family Identifier (SAFI).  Historically
   the AFI/SAFI definitions for the IPv4 address family only have
   provisions for advertising a Next Hop address that belongs to the
   IPv4 protocol when advertising IPv4 or VPN-IPv4 Network Layer
   Reachability Information (NLRI).  [RFC5549] specifies the extensions
   necessary to allow advertising IPv4 NLRI or VPN-IPv4 NLRI with a Next
   Hop address that belongs to the IPv6 protocol.  This comprises an
   extension of the AFI/SAFI definitions to allow the address of the
   Next Hop for IPv4 NLRI or VPN-IPv4 NLRI to also belong to the IPv6
   Protocol.  [RFC5549] defines the encoding of the Next Hop to
   determine which of the protocols the address actually belongs to, and
   a new BGP Capability allowing MP-BGP Peers to dynamically discover
   whether they can exchange IPv4 NLRI and VPN-IPv4 NLRI with an IPv6
   Next Hop.

   With this new MP-BGP capability exchange allows the BGP peering
   session to act as a pure transport to allow the session to carry
   Address Family Identifier (AFI) and the Subsequent Address Family
   Identifier (SAFI) for both IPv4 and IPv6.

   This document describes the critical use case and OPEX savings of
   being able to leverage the MP-BGP capability exchange usage as a pure
   transport allowing both IPv4 and IPv6 to be carried over the same BGP
   TCP session.  By doing so, allows for the elimination of Dual
   Stacking on the PE-CE connections making the peering IPv6-ONLY to now
   carry both IPv4 and IPv6 Network Layer Reachability Information
   (NLRI).  This document also provides a possible solution for IXPs
   (Internet Exchange points) that are facing IPv4 address depletion at
   these peering points to use BGP-MP capability exchange defined in
   [RFC5549] to carry IPv4 (Network Layer Reachability Information) NLRI
   in an IPv6 next hop using the [RFC5565] softwire mesh framework.




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--=20

<http://www.verizon.com/>

*Gyan Mishra*

*Network Solutions A**rchitect & SME*


*Data Center Planning | Common Core | Development & Engineering Lab
ServicesGlobal Technology Services | ITNUC*




*O 240 970-6287M 301 502-134713101 Columbia Pike Rm 304-D*Silver Spring, MD
20904


*IETF  & ISOC Member since 2015*

https://www.ietf.org/

https://www.internetsociety.org/




--=20

<http://www.verizon.com/>

*Gyan Mishra*

*Network Solutions A**rchitect *



*M 301 502-134713101 Columbia Pike *Silver Spring, MD

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<div dir=3D"ltr">All,<div><br></div><div>I have updated the draft and have =
added Jeff Tantsura as co-author to the draft.</div><div><br></div><div>Tha=
nk you</div><div><br></div><div>Gyan<br><br><div class=3D"gmail_quote"><div=
 dir=3D"ltr" class=3D"gmail_attr">---------- Forwarded message ---------<br=
>From: <strong class=3D"gmail_sendername" dir=3D"auto">Mishra, Gyan S</stro=
ng> <span dir=3D"auto">&lt;<a href=3D"mailto:gyan.s.mishra@verizon.com">gya=
n.s.mishra@verizon.com</a>&gt;</span><br>Date: Sat, Aug 22, 2020 at 2:22 AM=
<br>Subject: Fwd: [E] New Version Notification for draft-mishra-bess-ipv4nl=
ri-ipv6nh-use-cases-03.txt<br>To: Hayabusanew &lt;<a href=3D"mailto:hayabus=
agsm@gmail.com">hayabusagsm@gmail.com</a>&gt;<br></div><br><br><div dir=3D"=
ltr"><div style=3D"font-family:verdana,sans-serif;font-size:small"><br></di=
v><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">----=
------ Forwarded message ---------<br>From: <span dir=3D"auto">&lt;<a href=
=3D"mailto:internet-drafts@ietf.org" target=3D"_blank">internet-drafts@ietf=
.org</a>&gt;</span><br>Date: Sat, Aug 22, 2020 at 2:20 AM<br>Subject: [E] N=
ew Version Notification for draft-mishra-bess-ipv4nlri-ipv6nh-use-cases-03.=
txt<br>To: Jeff Tantsura &lt;<a href=3D"mailto:jefftant.ietf@gmail.com" tar=
get=3D"_blank">jefftant.ietf@gmail.com</a>&gt;, Gyan Mishra &lt;<a href=3D"=
mailto:gyan.s.mishra@verizon.com" target=3D"_blank">gyan.s.mishra@verizon.c=
om</a>&gt;, Mankamana Mishra &lt;<a href=3D"mailto:mankamis@cisco.com" targ=
et=3D"_blank">mankamis@cisco.com</a>&gt;<br></div><br><br><br>
A new version of I-D, draft-mishra-bess-ipv4nlri-ipv6nh-use-cases-03.txt<br=
>
has been successfully submitted by Gyan Mishra and posted to the<br>
IETF repository.<br>
<br>
Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-mishra-bess-ipv4nlri-ip=
v6nh-use-cases<br>
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A003<br>
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 IPv4 NLRI with IPv6 Next Hop Use C=
ases<br>
Document date:=C2=A0 2020-08-21<br>
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission<br>
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 15<br>
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://urldefense=
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<br>
Abstract:<br>
=C2=A0 =C2=A0As Enterprises and Service Providers upgrade their brown field=
 or<br>
=C2=A0 =C2=A0green field MPLS/SR core to an IPv6 transport such as MPLS LDP=
v6, SR-<br>
=C2=A0 =C2=A0MPLSv6 or SRv6, Multiprotocol BGP (MP-BGP)now plays an importa=
nt role<br>
=C2=A0 =C2=A0in the transition of the core from IPv4 to IPv6 being able to<=
br>
=C2=A0 =C2=A0continue to support legacy IPv4, VPN-IPv4, and Multicast VPN I=
Pv4<br>
=C2=A0 =C2=A0customers.<br>
<br>
=C2=A0 =C2=A0Multiprotocol BGP (MP-BGP) specifies that the set of usable ne=
xt-hop<br>
=C2=A0 =C2=A0address families is determined by the Address Family Identifie=
r (AFI)<br>
=C2=A0 =C2=A0and the Subsequent Address Family Identifier (SAFI).=C2=A0 His=
torically<br>
=C2=A0 =C2=A0the AFI/SAFI definitions for the IPv4 address family only have=
<br>
=C2=A0 =C2=A0provisions for advertising a Next Hop address that belongs to =
the<br>
=C2=A0 =C2=A0IPv4 protocol when advertising IPv4 or VPN-IPv4 Network Layer<=
br>
=C2=A0 =C2=A0Reachability Information (NLRI).=C2=A0 [RFC5549] specifies the=
 extensions<br>
=C2=A0 =C2=A0necessary to allow advertising IPv4 NLRI or VPN-IPv4 NLRI with=
 a Next<br>
=C2=A0 =C2=A0Hop address that belongs to the IPv6 protocol.=C2=A0 This comp=
rises an<br>
=C2=A0 =C2=A0extension of the AFI/SAFI definitions to allow the address of =
the<br>
=C2=A0 =C2=A0Next Hop for IPv4 NLRI or VPN-IPv4 NLRI to also belong to the =
IPv6<br>
=C2=A0 =C2=A0Protocol.=C2=A0 [RFC5549] defines the encoding of the Next Hop=
 to<br>
=C2=A0 =C2=A0determine which of the protocols the address actually belongs =
to, and<br>
=C2=A0 =C2=A0a new BGP Capability allowing MP-BGP Peers to dynamically disc=
over<br>
=C2=A0 =C2=A0whether they can exchange IPv4 NLRI and VPN-IPv4 NLRI with an =
IPv6<br>
=C2=A0 =C2=A0Next Hop.<br>
<br>
=C2=A0 =C2=A0With this new MP-BGP capability exchange allows the BGP peerin=
g<br>
=C2=A0 =C2=A0session to act as a pure transport to allow the session to car=
ry<br>
=C2=A0 =C2=A0Address Family Identifier (AFI) and the Subsequent Address Fam=
ily<br>
=C2=A0 =C2=A0Identifier (SAFI) for both IPv4 and IPv6.<br>
<br>
=C2=A0 =C2=A0This document describes the critical use case and OPEX savings=
 of<br>
=C2=A0 =C2=A0being able to leverage the MP-BGP capability exchange usage as=
 a pure<br>
=C2=A0 =C2=A0transport allowing both IPv4 and IPv6 to be carried over the s=
ame BGP<br>
=C2=A0 =C2=A0TCP session.=C2=A0 By doing so, allows for the elimination of =
Dual<br>
=C2=A0 =C2=A0Stacking on the PE-CE connections making the peering IPv6-ONLY=
 to now<br>
=C2=A0 =C2=A0carry both IPv4 and IPv6 Network Layer Reachability Informatio=
n<br>
=C2=A0 =C2=A0(NLRI).=C2=A0 This document also provides a possible solution =
for IXPs<br>
=C2=A0 =C2=A0(Internet Exchange points) that are facing IPv4 address deplet=
ion at<br>
=C2=A0 =C2=A0these peering points to use BGP-MP capability exchange defined=
 in<br>
=C2=A0 =C2=A0[RFC5549] to carry IPv4 (Network Layer Reachability Informatio=
n) NLRI<br>
=C2=A0 =C2=A0in an IPv6 next hop using the [RFC5565] softwire mesh framewor=
k.<br>
<br>
<br>
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<br>
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</div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr" data-smartma=
il=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=
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px;line-height:13px"><font face=3D"georgia, serif" style=3D"color:black;fon=
t-size:1em"><i>Network Solutions A</i></font><font color=3D"#000000" face=
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erif">Data Center Planning | Common Core | Development &amp; Engineering La=
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</div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr" class=3D"gma=
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www.verizon.com/" style=3D"color:rgb(17,85,204);padding-bottom:1em;display:=
inline-block" target=3D"_blank"><img src=3D"http://ss7.vzw.com/is/image/Ver=
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quot;Verizon NHG DS&quot;,Arial,sans-serif;line-height:13px;color:black"><b=
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13px"><font face=3D"georgia, serif" style=3D"color:black;font-size:1em"><i>=
Network Solutions A</i></font><font color=3D"#000000" face=3D"georgia, seri=
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e-height:13px;color:black"><i><font face=3D"georgia, serif">M 301 502-1347<=
br>13101 Columbia Pike=C2=A0<br></font></i>Silver Spring, MD</p></div><div>=
<br></div></div></div></div></div></div></div></div></div></div></div>

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: Alexander Vainshtein <Alexander.Vainshtein@rbbn.com>, "wang.yubao2@zte.com.cn" <wang.yubao2@zte.com.cn>
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Thread-Topic: [bess]  Hub-and-spoke support in EVPN: RFC 8317vs.draft-wang-bess-evpn-context-label-04
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Subject: Re: [bess] Hub-and-spoke support in EVPN: RFC 8317vs.draft-wang-bess-evpn-context-label-04
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Subject: Re: [bess] Hub-and-spoke support in EVPN: RFC8317vs.draft-wang-bess-evpn-context-label-04
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Subject: Re: [bess] Hub-and-spoke support in EVPN:RFC8317vs.draft-wang-bess-evpn-context-label-04
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Subject: Re: [bess] Hub-and-spoke support inEVPN:RFC8317vs.draft-wang-bess-evpn-context-label-04
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--_000_MN2PR05MB59812BFFC42E70F34A05E578D4560MN2PR05MB5981namp_--


From nobody Mon Aug 24 09:56:44 2020
Return-Path: <zzhang@juniper.net>
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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
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Thread-Topic: Re:[bess]  Hub-and-spoke support inEVPN:RFC8317vs.draft-wang-bess-evpn-context-label-04
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/mhllrDZPXU5HQIQgA05ewT34wc4>
Subject: Re: [bess] Hub-and-spoke support inEVPN:RFC8317vs.draft-wang-bess-evpn-context-label-04
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--_000_MN2PR05MB59817E032E6193996FDC2231D4560MN2PR05MB5981namp_--


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Subject: [bess] Alvaro Retana's No Objection on draft-ietf-bess-rfc5549revision-04: (with COMMENT)
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Alvaro Retana has entered the following ballot position for
draft-ietf-bess-rfc5549revision-04: No Objection

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

(1) Security Considerations

The use of an IPv6 Next Hop opens up the possibility of diverting the traffic:
there is no provision in this draft, or rfc2545, to validate or somehow verify
that the address is "correct".  IOW, a rogue BGP speaker may use a Next Hop
address to redirect the traffic elsewhere.  Traffic diversion is a known
vulnerability, but I would still like to see something in this document about
it.

Suggestion (borrowing from draft-ietf-idr-tunnel-encaps)>

   As [RFC4272] discusses, BGP is vulnerable to traffic diversion attacks.
   The ability to advertise an IPv6 Next Hop adds a new means by which an
   attacker could cause traffic to be diverted from its normal path.  Such an
   attack differs from pre-existing vulnerabilities in that traffic could be
   forwarded to a distant target across an intervening network infrastructure
   (e.g. an IPv6 core), allowing an attack to potentially succeed more
   easily, since less infrastructure would have to be subverted.  Potential
   consequences include "hijacking" of traffic or denial of service.

(2) Â§4:

   The Extended Next Hop Encoding capability MAY be dynamically updated
   through the use of the Dynamic Capability capability and associated
   mechanisms defined in [I-D.ietf-idr-dynamic-cap].

This text creates a Normative dependence on I-D.ietf-idr-dynamic-cap.  However,
that document expired more than 8 years ago.  Please remove this paragraph.

(3) It would be very nice if a section summarizing the changes between this
document and rfc5549 was included.

(4) rfc5549 was written more than 10 years ago...what qualified then as
"current" and "new" doesn't anymore.  It would be nice to update some of that
language.

(5) [nits]

s/IPV4/IPv4/g

s/allows advertising with [RFC4760] of an MP_REACH_NLRI with/allows advertising
the MP_REACH_NLRI attribute [RFC4760] with this content




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Subject: [bess] Benjamin Kaduk's No Objection on draft-ietf-bess-rfc5549revision-04: (with COMMENT)
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Benjamin Kaduk has entered the following ballot position for
draft-ietf-bess-rfc5549revision-04: No Objection

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

The IANA Considerations need to be updated to reflect that this is a
"bis" of 5549, and is not making the allocation de novo.  I.e., it
should be "update the reference for the existing registration".

RFC 5549 says that the "Length of Next Hop Address" field for AFI/SAFI
1/128 is "16 or 32", but this document says that it is "24 or 48", which
has no overlap.  Is this a breaking change?  Ah, I guess this is
essentially errata report 5253
(https://www.rfc-editor.org/errata/eid5253).  I'd suggest that we note
that this update includes addressing that errata report.

I would also suggest a brief note that the main nature of the update is
to add support for AFI/SAFI 1/129 (as that seems to be the bulk of the
diff between RFC 5549 and this document); I believe Alvaro has asked for
something similar as well.

Other than that, just a few very minor comments for your consideration
(and for which no reply is necessary).

Section 1

   There are situations such as those described in [RFC4925] and in
   [RFC5565] where carriers (or large enterprise networks acting as

nit: the transition into this paragraph is a bit abrupt, wth the
previous paragraphs talking about existing AFI/SAFIs that already are
flexible about IPv4 vs IPv6 based on length, but now we're back into
describing a problem statement for which the solution looks quite
similar.

Section 4

I'm happy to see that the format of the Capability Value field
explicitly indicates the NLRI AFI/SAFI and nexthop AFI triples
supported, so there is no deployability concern about using the same
capability code value to indicate support for new SAFI types.

Section 5

   When a next hop address needs to be passed along unchanged (e.g., as
   a Route Reflector (RR) would do), its encoding MUST NOT be changed.
   If a particular RR client cannot handle that encoding (as determined
   by the BGP Capability Advertisement), then the NLRI in question
   cannot be distributed to that client.  For sound routing in certain
   scenarios, this will require that all the RR clients be able to
   handle whatever encodings any of them may generate.

This is good advice; I wonder if it is worth a brief mention in the
security considerations as well.

Section 10.1

In my reading, the places where we reference RFC 4291 do not require it
to be a normative reference.

Section 10.2

I agree with Alvaro about draft-ietf-idr-dynamic-cap.




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Subject: Re: [bess] [Gen-art] Genart last call review of draft-ietf-bess-rfc5549revision-04
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Christer, thanks for your review. Stephane, thanks for your response. I =
entered a No Objection ballot. Ben has flagged the IANA considerations =
issue in his ballot.

Alissa

> On Jul 14, 2020, at 8:50 AM, Christer Holmberg =
<christer.holmberg=3D40ericsson.com@dmarc.ietf.org> wrote:
>=20
> Hi Stephane,
>=20
>> Thanks for your comments.
>> For your information, this document is just a revision of RFC5549, so =
99,9% of the text is just copy/paste from the existing RFC.
>> Of course, we can improve things.
>>=20
>> I'll take care of your comments for a next revision.
>> For the IANA section, as IANA will not have any action, I would =
prefer keeping the existing text from RFC5549. We can also let other =
people comment on that point.
>=20
> In that case, shouldn't you at least update the reference (from =
RFC5549 to this document) in the IANA registry?=20
>=20
> But, as the document obsoletes RFC5549, I would personally include the =
complete registration text in this document - even if it is just =
copy/paste from RFC5549.
>=20
> Regards,
>=20
> Christer
>=20
>=20
>=20
>=20
> -----Original Message-----
> From: Christer Holmberg via Datatracker <noreply@ietf.org>=20
> Sent: vendredi 10 juillet 2020 00:17
> To: gen-art@ietf.org
> Cc: draft-ietf-bess-rfc5549revision.all@ietf.org; last-call@ietf.org; =
bess@ietf.org
> Subject: Genart last call review of draft-ietf-bess-rfc5549revision-04
>=20
> Reviewer: Christer Holmberg
> Review result: Almost Ready
>=20
> I am the assigned Gen-ART reviewer for this draft. The General Area =
Review Team (Gen-ART) reviews all IETF documents being processed by the =
IESG for the IETF Chair.  Please treat these comments just like any =
other last call comments.
>=20
> For more information, please see the FAQ at
>=20
> <https://trac.ietf.org/trac/gen/wiki/GenArtfaq>.
>=20
> Document: draft-ietf-bess-rfc5549revision-04
> Reviewer: Christer Holmberg
> Review Date: 2020-07-09
> IETF LC End Date: 2020-07-21
> IESG Telechat date: Not scheduled for a telechat
>=20
> Summary: The document is well written, and almost ready for =
publication. I only have a couple of editorial nits.
>=20
> Major issues: N/A
>=20
> Minor issues: N/A
>=20
> Nits/editorial comments:
>=20
> Q1. In the Abstract, I suggest the split the text into 2 paragrahps, =
where the "This document specifies..." sentence is the beginning of the =
second paragraph.
>=20
> Q2. In the Introduction section, in the last paragraph, instead of =
saying "This document specifies the extensions necessary to do so." I =
suggest to be explicit about what the document specifies - similar to =
the Abstract.
>=20
> Q3. The document uses "IPvX Network Layer Protocol" and "IPvX =
Protocol"
> terminology. Similarly, the document uses "IPvX" and "IPvX Address"
> terminology. Unless there is a good reason, I suggest do double check =
whether the terminology can be more consistent.
>=20
> Q4. In the IANA Considerations section, I suggest to use the IANA =
registry table format, where the different values (Value, Description =
and Reference) are indicated, e.g., as in Section 7 of RFC 8654. Also =
similar to 8654, please indicate the IANA registry name.
>=20
>=20
>=20
> _______________________________________________
> Gen-art mailing list
> Gen-art@ietf.org
> https://www.ietf.org/mailman/listinfo/gen-art


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From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Wed, 26 Aug 2020 01:05:04 -0400
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To: "Voyer, Daniel" <daniel.voyer@bell.ca>
Cc: "Boutros, Sami" <sboutros=40ciena.com@dmarc.ietf.org>,  "Parag Jain (paragj)" <paragj@cisco.com>, "bess-chairs@ietf.org" <bess-chairs@ietf.org>, "bess@ietf.org" <bess@ietf.org>, "draft-ietf-bess-evpn-lsp-ping@ietf.org" <draft-ietf-bess-evpn-lsp-ping@ietf.org>,  "slitkows.ietf@gmail.com" <slitkows.ietf@gmail.com>
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I support advancement.

Kind Regards

Gyan

On Fri, Jul 17, 2020 at 2:24 PM Voyer, Daniel <daniel.voyer@bell.ca> wrote:

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>
>
>
>
> Support !
>
>
>
>
>
>
>
> *From: *BESS <bess-bounces@ietf.org> on behalf of "Boutros, Sami"
> <sboutros=40ciena.com@dmarc.ietf.org>
>
>
> *Date: *Friday, July 17, 2020 at 7:43 AM
>
>
> *To: *"Parag Jain (paragj)" <paragj@cisco.com>, "slitkows.ietf@gmail.com"
> <slitkows.ietf@gmail.com>, "bess@ietf.org" <bess@ietf.org>, "
> draft-ietf-bess-evpn-lsp-ping@ietf.org" <
> draft-ietf-bess-evpn-lsp-ping@ietf.org>
>
>
> *Cc: *"bess-chairs@ietf.org" <bess-chairs@ietf.org>
>
>
> *Subject: *[EXT]Re: [bess] [**EXTERNAL**] Re: WGLC, IPR and
> implementation poll for draft-ietf-bess-evpn-lsp-ping
>
>
>
>
>
>
>
>
>
>
>
> +1
>
>
>
>
>
>
>
> *From: *"Parag Jain (paragj)" <paragj@cisco.com>
>
>
> *Date: *Saturday, July 4, 2020 at 7:25 AM
>
>
> *To: *"slitkows.ietf@gmail.com" <slitkows.ietf@gmail.com>, "bess@ietf.org"
> <bess@ietf.org>, "draft-ietf-bess-evpn-lsp-ping@ietf.org" <
> draft-ietf-bess-evpn-lsp-ping@ietf.org>
>
>
> *Cc: *"bess-chairs@ietf.org" <bess-chairs@ietf.org>
>
>
> *Subject: *[**EXTERNAL**] Re: [bess] WGLC, IPR and implementation poll
> for draft-ietf-bess-evpn-lsp-ping
>
>
> *Resent-From: *<alias-bounces@ietf.org>
>
>
> *Resent-To: *<paragj@cisco.com>, <ssalam@cisco.com>, <sajassi@cisco.com>,
> <sboutros@ciena.com>, <gregimirsky@gmail.com>
>
>
> *Resent-Date: *Saturday, July 4, 2020 at 7:25 AM
>
>
>
>
>
>
>
>
>
>
>
> I support this draft as coauthor. I am not aware of any undisclosed IPRs
> related to this draft.
>
>
>
>
>
> Thanks
>
>
> Parag
>
>
>
>
>
>
>
> *From: *BESS <bess-bounces@ietf.org> on behalf of "slitkows.ietf@gmail.com"
> <slitkows.ietf@gmail.com>
>
>
> *Date: *Friday, July 3, 2020 at 9:29 AM
>
>
> *To: *"bess@ietf.org" <bess@ietf.org>, "
> draft-ietf-bess-evpn-lsp-ping@ietf.org" <
> draft-ietf-bess-evpn-lsp-ping@ietf.org>
>
>
> *Cc: *"bess-chairs@ietf.org" <bess-chairs@ietf.org>
>
>
> *Subject: *[bess] WGLC, IPR and implementation poll for
> draft-ietf-bess-evpn-lsp-ping
>
>
>
>
>
>
>
>
>
>
>
> Hello WG,
>
>
>
>
>
> This email starts a two weeks Working Group Last Call on
> draft-ietf-bess-evpn-lsp-ping-02 [1].
>
>
>
>
>
> This poll runs until * the 20th Of July *.
>
>
>
>
>
> We are also polling for knowledge of any undisclosed IPR that applies to
> this Document, to ensure that IPR has been disclosed in compliance with
> IETF IPR rules (see RFCs 3979, 4879,
>
> 3669 and 5378 for more details).
>
>
> If you are listed as an Author or a Contributor of this Document please
> respond to this email and indicate whether or not you are aware of any
> relevant undisclosed IPR. The Document
>
> won't progress without answers from all the Authors and Contributors.
>
>
> There is currently no IPR disclosed.
>
>
>
>
>
>
>
> If you are not listed as an Author or a Contributor, then please
> explicitly respond only if you are aware of any IPR that has not yet been
> disclosed in conformance with IETF rules.
>
>
>
>
>
>
>
> We are also polling for any existing implementation as per [2].
>
>
>
>
>
>
> Thank you,
>
>
> Stephane & Matthew
>
>
>
>
>
> [1]
>
> https://datatracker.ietf.org/doc/draft-ietf-bess-evpn-lsp-ping/
> [datatracker.ietf.org]
> <https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-ietf-bess-evpn-lsp-ping/__;!!OSsGDw!ZifeGimCaX6N-StrmS52YdHpuTPKN-Z9wXM9YXYqTaFqYz0y0DIeVKGKvRCPtg$>
>
>
> [2]
>
> https://mailarchive.ietf.org/arch/msg/bess/cG3X1tTqb_vPC4rg56SEdkjqDpw
> [mailarchive.ietf.org]
> <https://urldefense.com/v3/__https:/mailarchive.ietf.org/arch/msg/bess/cG3X1tTqb_vPC4rg56SEdkjqDpw__;!!OSsGDw!ZifeGimCaX6N-StrmS52YdHpuTPKN-Z9wXM9YXYqTaFqYz0y0DIeVKHgFetviw$>
>
>
>
>
>
>
>
>
>
>
>
> _______________________________________________
>
> BESS mailing list
>
> BESS@ietf.org
>
> https://www.ietf.org/mailman/listinfo/bess
>
> --

<http://www.verizon.com/>

*Gyan Mishra*

*Network Solutions A**rchitect *



*M 301 502-134713101 Columbia Pike *Silver Spring, MD

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<div><br></div><div dir=3D"auto">I support advancement.</div><div dir=3D"au=
to"><br></div><div dir=3D"auto">Kind Regards=C2=A0</div><div dir=3D"auto"><=
br></div><div dir=3D"auto">Gyan</div><div><br><div class=3D"gmail_quote"><d=
iv dir=3D"ltr" class=3D"gmail_attr">On Fri, Jul 17, 2020 at 2:24 PM Voyer, =
Daniel &lt;<a href=3D"mailto:daniel.voyer@bell.ca">daniel.voyer@bell.ca</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"><br><br><br><br><br><br=
><br><br><br><br><br><br><div lang=3D"EN-CA" link=3D"#0563C1" vlink=3D"purp=
le"><br><br><div class=3D"m_7803902277327911371WordSection1"><br><br><p cla=
ss=3D"MsoNormal">Support !<u></u><u></u></p></div></div><div lang=3D"EN-CA"=
 link=3D"#0563C1" vlink=3D"purple"><div class=3D"m_7803902277327911371WordS=
ection1"><br><br><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><br><br><di=
v style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm 0cm=
 0cm"><br><br><p class=3D"MsoNormal"><b><span style=3D"font-size:12.0pt;col=
or:black">From: </span></b><span style=3D"font-size:12.0pt;color:black">BES=
S &lt;<a href=3D"mailto:bess-bounces@ietf.org" target=3D"_blank">bess-bounc=
es@ietf.org</a>&gt; on behalf of &quot;Boutros, Sami&quot; &lt;sboutros=3D<=
a href=3D"mailto:40ciena.com@dmarc.ietf.org" target=3D"_blank">40ciena.com@=
dmarc.ietf.org</a>&gt;<br><br><br><b>Date: </b>Friday, July 17, 2020 at 7:4=
3 AM<br><br><br><b>To: </b>&quot;Parag Jain (paragj)&quot; &lt;<a href=3D"m=
ailto:paragj@cisco.com" target=3D"_blank">paragj@cisco.com</a>&gt;, &quot;<=
a href=3D"mailto:slitkows.ietf@gmail.com" target=3D"_blank">slitkows.ietf@g=
mail.com</a>&quot; &lt;<a href=3D"mailto:slitkows.ietf@gmail.com" target=3D=
"_blank">slitkows.ietf@gmail.com</a>&gt;, &quot;<a href=3D"mailto:bess@ietf=
.org" target=3D"_blank">bess@ietf.org</a>&quot; &lt;<a href=3D"mailto:bess@=
ietf.org" target=3D"_blank">bess@ietf.org</a>&gt;, &quot;<a href=3D"mailto:=
draft-ietf-bess-evpn-lsp-ping@ietf.org" target=3D"_blank">draft-ietf-bess-e=
vpn-lsp-ping@ietf.org</a>&quot; &lt;<a href=3D"mailto:draft-ietf-bess-evpn-=
lsp-ping@ietf.org" target=3D"_blank">draft-ietf-bess-evpn-lsp-ping@ietf.org=
</a>&gt;<br><br><br><b>Cc: </b>&quot;<a href=3D"mailto:bess-chairs@ietf.org=
" target=3D"_blank">bess-chairs@ietf.org</a>&quot; &lt;<a href=3D"mailto:be=
ss-chairs@ietf.org" target=3D"_blank">bess-chairs@ietf.org</a>&gt;<br><br><=
br><b>Subject: </b>[EXT]Re: [bess] [**EXTERNAL**] Re: WGLC, IPR and impleme=
ntation poll for draft-ietf-bess-evpn-lsp-ping<u></u><u></u></span></p><br>=
<br></div><br><br><div><br><br><p class=3D"MsoNormal"><u></u>=C2=A0<u></u><=
/p><br><br></div><br><br><p class=3D"MsoNormal">+1<u></u><u></u></p><br><br=
><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p><br><br><div style=3D"borde=
r:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm 0cm 0cm"><br><br><p=
 class=3D"MsoNormal"><b><span style=3D"font-size:12.0pt;color:black">From: =
</span></b><span style=3D"font-size:12.0pt;color:black">&quot;Parag Jain (p=
aragj)&quot; &lt;<a href=3D"mailto:paragj@cisco.com" target=3D"_blank">para=
gj@cisco.com</a>&gt;<br><br><br><b>Date: </b>Saturday, July 4, 2020 at 7:25=
 AM<br><br><br><b>To: </b>&quot;<a href=3D"mailto:slitkows.ietf@gmail.com" =
target=3D"_blank">slitkows.ietf@gmail.com</a>&quot; &lt;<a href=3D"mailto:s=
litkows.ietf@gmail.com" target=3D"_blank">slitkows.ietf@gmail.com</a>&gt;, =
&quot;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a>&=
quot; &lt;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org<=
/a>&gt;, &quot;<a href=3D"mailto:draft-ietf-bess-evpn-lsp-ping@ietf.org" ta=
rget=3D"_blank">draft-ietf-bess-evpn-lsp-ping@ietf.org</a>&quot; &lt;<a hre=
f=3D"mailto:draft-ietf-bess-evpn-lsp-ping@ietf.org" target=3D"_blank">draft=
-ietf-bess-evpn-lsp-ping@ietf.org</a>&gt;<br><br><br><b>Cc: </b>&quot;<a hr=
ef=3D"mailto:bess-chairs@ietf.org" target=3D"_blank">bess-chairs@ietf.org</=
a>&quot; &lt;<a href=3D"mailto:bess-chairs@ietf.org" target=3D"_blank">bess=
-chairs@ietf.org</a>&gt;<br><br><br><b>Subject: </b>[**EXTERNAL**] Re: [bes=
s] WGLC, IPR and implementation poll for draft-ietf-bess-evpn-lsp-ping<br><=
br><br><b>Resent-From: </b>&lt;<a href=3D"mailto:alias-bounces@ietf.org" ta=
rget=3D"_blank">alias-bounces@ietf.org</a>&gt;<br><br><br><b>Resent-To: </b=
>&lt;<a href=3D"mailto:paragj@cisco.com" target=3D"_blank">paragj@cisco.com=
</a>&gt;, &lt;<a href=3D"mailto:ssalam@cisco.com" target=3D"_blank">ssalam@=
cisco.com</a>&gt;, &lt;<a href=3D"mailto:sajassi@cisco.com" target=3D"_blan=
k">sajassi@cisco.com</a>&gt;, &lt;<a href=3D"mailto:sboutros@ciena.com" tar=
get=3D"_blank">sboutros@ciena.com</a>&gt;, &lt;<a href=3D"mailto:gregimirsk=
y@gmail.com" target=3D"_blank">gregimirsky@gmail.com</a>&gt;<br><br><br><b>=
Resent-Date: </b>Saturday, July 4, 2020 at 7:25 AM</span><u></u><u></u></p>=
<br><br></div><br><br><div><br><br><p class=3D"MsoNormal">=C2=A0<u></u><u><=
/u></p><br><br></div><br><br><p class=3D"MsoNormal"><span style=3D"color:bl=
ack">I support this draft as coauthor. I am not aware of any undisclosed IP=
Rs related to this draft.</span><u></u><u></u></p><br><br><p class=3D"MsoNo=
rmal">=C2=A0<u></u><u></u></p><br><br><p class=3D"MsoNormal">Thanks<u></u><=
u></u></p><br><br><p class=3D"MsoNormal">Parag<u></u><u></u></p><br><br><p =
class=3D"MsoNormal">=C2=A0<u></u><u></u></p><br><br><div style=3D"border:no=
ne;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm 0cm 0cm"><br><br><p cla=
ss=3D"MsoNormal"><b><span style=3D"font-size:12.0pt;color:black">From: </sp=
an></b><span style=3D"font-size:12.0pt;color:black">BESS &lt;<a href=3D"mai=
lto:bess-bounces@ietf.org" target=3D"_blank">bess-bounces@ietf.org</a>&gt; =
on behalf of &quot;<a href=3D"mailto:slitkows.ietf@gmail.com" target=3D"_bl=
ank">slitkows.ietf@gmail.com</a>&quot; &lt;<a href=3D"mailto:slitkows.ietf@=
gmail.com" target=3D"_blank">slitkows.ietf@gmail.com</a>&gt;<br><br><br><b>=
Date: </b>Friday, July 3, 2020 at 9:29 AM<br><br><br><b>To: </b>&quot;<a hr=
ef=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a>&quot; &lt;<=
a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a>&gt;, &q=
uot;<a href=3D"mailto:draft-ietf-bess-evpn-lsp-ping@ietf.org" target=3D"_bl=
ank">draft-ietf-bess-evpn-lsp-ping@ietf.org</a>&quot; &lt;<a href=3D"mailto=
:draft-ietf-bess-evpn-lsp-ping@ietf.org" target=3D"_blank">draft-ietf-bess-=
evpn-lsp-ping@ietf.org</a>&gt;<br><br><br><b>Cc: </b>&quot;<a href=3D"mailt=
o:bess-chairs@ietf.org" target=3D"_blank">bess-chairs@ietf.org</a>&quot; &l=
t;<a href=3D"mailto:bess-chairs@ietf.org" target=3D"_blank">bess-chairs@iet=
f.org</a>&gt;<br><br><br><b>Subject: </b>[bess] WGLC, IPR and implementatio=
n poll for draft-ietf-bess-evpn-lsp-ping</span><u></u><u></u></p><br><br></=
div><br><br><div><br><br><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p><br=
><br></div><br><br><p class=3D"MsoNormal">Hello WG,<u></u><u></u></p><br><b=
r><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p><br><br><p class=3D"MsoNor=
mal">This email starts a two weeks Working Group Last Call on draft-ietf-be=
ss-evpn-lsp-ping-02 [1].<u></u><u></u></p><br><br><p class=3D"MsoNormal">=
=C2=A0<u></u><u></u></p><br><br><p class=3D"MsoNormal">This poll runs until=
 * the 20<sup>th</sup> Of July *.<u></u><u></u></p><br><br><p class=3D"MsoN=
ormal">=C2=A0<u></u><u></u></p><br><br><p class=3D"m_7803902277327911371gma=
il-m-3566480992569920863gmail-m-6487177298439282362msoplaintext">We are als=
o polling for knowledge of any undisclosed IPR that applies to this Documen=
t, to ensure that IPR has been disclosed in compliance with IETF IPR rules =
(see RFCs 3979, 4879,<br><br> 3669 and 5378 for more details).<u></u><u></u=
></p><br><br><p class=3D"m_7803902277327911371gmail-m-3566480992569920863gm=
ail-m-6487177298439282362msoplaintext">If you are listed as an Author or a =
Contributor of this Document please respond to this email and indicate whet=
her or not you are aware of any relevant undisclosed IPR. The Document<br><=
br> won&#39;t progress without answers from all the Authors and Contributor=
s.=C2=A0<u></u><u></u></p><br><br><p class=3D"m_7803902277327911371gmail-m-=
3566480992569920863gmail-m-6487177298439282362msoplaintext">There is curren=
tly no IPR disclosed.<u></u><u></u></p><br><br><p class=3D"m_78039022773279=
11371gmail-m-3566480992569920863gmail-m-6487177298439282362msoplaintext" st=
yle=3D"margin-left:72.0pt"><br><br>=C2=A0<u></u><u></u></p><br><br><p class=
=3D"m_7803902277327911371gmail-m-3566480992569920863gmail-m-648717729843928=
2362msoplaintext">If you are not listed as an Author or a Contributor, then=
 please explicitly respond only if you are aware of any IPR that has not ye=
t been disclosed in conformance with IETF rules.<u></u><u></u></p><br><br><=
p class=3D"m_7803902277327911371gmail-m-3566480992569920863gmail-m-64871772=
98439282362msoplaintext" style=3D"margin-left:72.0pt"><br><br>=C2=A0<u></u>=
<u></u></p><br><br><p class=3D"m_7803902277327911371gmail-m-356648099256992=
0863gmail-m-6487177298439282362msoplaintext">We are also polling for any ex=
isting implementation as per [2].<br><br><u></u><u></u></p><br><br><p class=
=3D"m_7803902277327911371gmail-m-3566480992569920863gmail-m-648717729843928=
2362msoplaintext">=C2=A0<u></u><u></u></p><br><br><p class=3D"m_78039022773=
27911371gmail-m-3566480992569920863gmail-m-6487177298439282362msoplaintext"=
>Thank you,<u></u><u></u></p><br><br><p class=3D"m_7803902277327911371gmail=
-m-3566480992569920863gmail-m-6487177298439282362msoplaintext">Stephane &am=
p; Matthew<u></u><u></u></p><br><br><p class=3D"MsoNormal">=C2=A0<u></u><u>=
</u></p><br><br><p class=3D"MsoNormal">[1] <a href=3D"https://urldefense.co=
m/v3/__https:/datatracker.ietf.org/doc/draft-ietf-bess-evpn-lsp-ping/__;!!O=
SsGDw!ZifeGimCaX6N-StrmS52YdHpuTPKN-Z9wXM9YXYqTaFqYz0y0DIeVKGKvRCPtg$" targ=
et=3D"_blank"><br><br>https://datatracker.ietf.org/doc/draft-ietf-bess-evpn=
-lsp-ping/ [datatracker.ietf.org]</a><u></u><u></u></p><br><br><p class=3D"=
MsoNormal">[2] <a href=3D"https://urldefense.com/v3/__https:/mailarchive.ie=
tf.org/arch/msg/bess/cG3X1tTqb_vPC4rg56SEdkjqDpw__;!!OSsGDw!ZifeGimCaX6N-St=
rmS52YdHpuTPKN-Z9wXM9YXYqTaFqYz0y0DIeVKHgFetviw$" target=3D"_blank"><br><br=
>https://mailarchive.ietf.org/arch/msg/bess/cG3X1tTqb_vPC4rg56SEdkjqDpw [ma=
ilarchive.ietf.org]</a><u></u><u></u></p><br><br><p class=3D"MsoNormal">=C2=
=A0<u></u><u></u></p><br><br></div><br><br></div><br><br><br><br>__________=
_____________________________________<br><br>BESS mailing list<br><br><a hr=
ef=3D"mailto:BESS@ietf.org" target=3D"_blank">BESS@ietf.org</a><br><br><a h=
ref=3D"https://www.ietf.org/mailman/listinfo/bess" rel=3D"noreferrer" targe=
t=3D"_blank">https://www.ietf.org/mailman/listinfo/bess</a><br><br></blockq=
uote></div></div>-- <br><div dir=3D"ltr" class=3D"gmail_signature" data-sma=
rtmail=3D"gmail_signature"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"lt=
r"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div=
><p style=3D"color:rgb(34,34,34)"><a href=3D"http://www.verizon.com/" style=
=3D"color:rgb(17,85,204);padding-bottom:1em;display:inline-block" target=3D=
"_blank"><img src=3D"http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-em=
ail" width=3D"81" height=3D"18" style=3D"height:18px;width:81px"></a><br></=
p><p style=3D"font-size:1em;margin:0px;font-family:&quot;Verizon NHG DS&quo=
t;,Arial,sans-serif;line-height:13px;color:black"><b>Gyan Mishra</b></p><p =
style=3D"color:rgb(34,34,34);margin:0px;line-height:13px"><font face=3D"geo=
rgia, serif" style=3D"color:black;font-size:1em"><i>Network Solutions A</i>=
</font><font color=3D"#000000" face=3D"georgia, serif"><i>rchitect=C2=A0</i=
></font></p><p style=3D"font-size:1em;margin:0px;line-height:13px;color:bla=
ck"><i><font face=3D"georgia, serif">M 301 502-1347<br>13101 Columbia Pike=
=C2=A0<br></font></i>Silver Spring, MD</p></div><div><br></div></div></div>=
</div></div></div></div></div></div>

--000000000000e65ae505adc0c379--


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Subject: [bess] Murray Kucherawy's Discuss on draft-ietf-bess-rfc5549revision-04: (with DISCUSS and COMMENT)
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Murray Kucherawy has entered the following ballot position for
draft-ietf-bess-rfc5549revision-04: Discuss

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----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------

An easy one, but necessary IMHO:

I'm confused by the IANA Considerations section.  It looks like a verbatim copy
from RFC 5549 which made the original registration for "Extended Next Hop
Encoding", but this isn't actually a new registration.  Shouldn't this
therefore be something like the following?

NEW:

RFC 5549 added "Extended Next Hop Encoding" to the Capability Codes registry,
which was created by [RFC5492].  IANA is requested to update the definition of
that entry to refer instead to this document.


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

Thanks for this document.  It was easy to read even for people like me who
don't get involved in routing too much.

Thank you also for the shepherd writeup, which (unlike most lately) actually
answered the question "Why is this the proper type of RFC?"




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Cc: draft-ietf-bess-rfc5549revision@ietf.org, bess-chairs@ietf.org, bess@ietf.org, Matthew Bocci <matthew.bocci@nokia.com>, matthew.bocci@nokia.com
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Subject: [bess] Warren Kumari's No Objection on draft-ietf-bess-rfc5549revision-04: (with COMMENT)
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Warren Kumari has entered the following ballot position for
draft-ietf-bess-rfc5549revision-04: No Objection

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

I found this document really hard to review - not because the document itself
was unclear, but rather because I had to keep going back and forth between it
and RFC5549. Passing it though 'diff' helped some, but a few sentences
explaining the differences would have helped immensely; it would also help
RFC5549 implementers understand what they need to change to be compliant...




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Cc: bess-chairs@ietf.org, rfc-editor@rfc-editor.org, martin.vigoureux@nokia.com, bess@ietf.org, draft-ietf-bess-nsh-bgp-control-plane@ietf.org, The IESG <iesg@ietf.org>, slitkows.ietf@gmail.com
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Subject: [bess] Protocol Action: 'BGP Control Plane for the Network Service Header in Service Function Chaining' to Proposed Standard (draft-ietf-bess-nsh-bgp-control-plane-18.txt)
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The IESG has approved the following document:
- 'BGP Control Plane for the Network Service Header in Service Function
   Chaining'
  (draft-ietf-bess-nsh-bgp-control-plane-18.txt) as Proposed Standard

This document is the product of the BGP Enabled ServiceS Working Group.

The IESG contact persons are Alvaro Retana, Deborah Brungard and Martin
Vigoureux.

A URL of this Internet Draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-nsh-bgp-control-plane/




Technical Summary

   The document defines a BGP control plane for NSH based service chaining.

Working Group Summary

   There is a good level of consensus on the document.

Document Quality

   There is no implementation or committed roadmap.
   However, the WG supports the publication of the document as an RFC (as per BESS implementation policy)

Personnel

Stephane Litkowski is the document shepherd.
Martin Vigoureux is the responsible AD.


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From: Ralf Weber via Datatracker <noreply@ietf.org>
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Subject: [bess] Intdir last call review of draft-ietf-bess-evpn-na-flags-05
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Reviewer: Ralf Weber
Review result: Ready

Moin!

I am an assigned INT directorate reviewer for draft-ietf-bess-evpn-na-flags.

These comments were written primarily for the benefit of the Internet Area
Directors. Document editors and shepherd(s) should treat these comments just
like they would treat comments from any other IETF contributors and resolve
them along with any other Last Call comments that have been received. For more
details on the INT Directorate, see
https://datatracker.ietf.org/group/intdir/about/

The draft does a very good job explaining the motivation, definition and use of
the extended community flags with good and applicable examples. I personally
would have used stronger (MUST) language for the R and O bits set to 0 on the
IPv4->MAC transmission (3.1 sub point 2), but as these are optional anyway and
must be ignored by the receiver it really makes no difference.

So long
-Ralf




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From: "Stephane Litkowski (slitkows)" <slitkows@cisco.com>
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Subject: [bess] I-D Action: draft-ietf-bess-rfc5549revision-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 BGP Enabled ServiceS WG of the IETF.

        Title           : Advertising IPv4 Network Layer Reachability Information with an IPv6 Next Hop
        Authors         : Stephane Litkowski
                          Swadesh Agrawal
                          Krishna Muddenahally Ananthamurthy
                          Keyur Patel
	Filename        : draft-ietf-bess-rfc5549revision-05.txt
	Pages           : 14
	Date            : 2020-08-31

Abstract:
   Multiprotocol BGP (MP-BGP) specifies that the set of usable next-hop
   address families is determined by the Address Family Identifier (AFI)
   and the Subsequent Address Family Identifier (SAFI).  The AFI/SAFI
   definitions for the IPv4 address family only have provisions for
   advertising a Next Hop address that belongs to the IPv4 protocol when
   advertising IPv4 Network Layer Reachability Information (NLRI) or
   VPN-IPv4 NLRI.

   This document specifies the extensions necessary to allow advertising
   IPv4 NLRI or VPN-IPv4 NLRI with a Next Hop address that belongs to
   the IPv6 protocol.  This comprises an extension of the AFI/SAFI
   definitions to allow the address of the Next Hop for IPv4 NLRI or
   VPN-IPv4 NLRI to also belong to the IPv6 protocol, the encoding of
   the Next Hop to determine which of the protocols the address actually
   belongs to, and a BGP Capability allowing MP-BGP Peers to dynamically
   discover whether they can exchange IPv4 NLRI and VPN-IPv4 NLRI with
   an IPv6 Next Hop. This document obsoletes RFC5549.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-rfc5549revision/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-rfc5549revision-05
https://datatracker.ietf.org/doc/html/draft-ietf-bess-rfc5549revision-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-rfc5549revision-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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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/RtAozs5o3CB46EHhdNx5aTxs4D8>
Subject: Re: [bess] Genart last call review of draft-ietf-bess-evpn-na-flags-05
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Robert,

Thank you very much for the review. Great points.
Please see in-line with [Jorge]. All the changes will be included in the ne=
xt revision.
Thank you!
Jorge

From: Robert Sparks via Datatracker <noreply@ietf.org>
Date: Tuesday, August 18, 2020 at 6:11 PM
To: gen-art@ietf.org <gen-art@ietf.org>
Cc: draft-ietf-bess-evpn-na-flags.all@ietf.org <draft-ietf-bess-evpn-na-fla=
gs.all@ietf.org>, last-call@ietf.org <last-call@ietf.org>, bess@ietf.org <b=
ess@ietf.org>
Subject: Genart last call review of draft-ietf-bess-evpn-na-flags-05
Reviewer: Robert Sparks
Review result: Ready with Nits

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

For more information, please see the FAQ at

<https://trac.ietf.org/trac/gen/wiki/GenArtfaq>.

Document: draft-ietf-bess-evpn-na-flags-05
Reviewer: Robert Sparks
Review Date: 2020-08-18
IETF LC End Date: 2020-08-28
IESG Telechat date: Not scheduled for a telechat

Summary: Ready for publication as a Proposed Standard RFC but with nits to
address before publication

The protocol being defined seems fine, and the IANA considerations are well
constructed. I have a nagging feeling that there are new security concerns =
this
introduces, but haven't been able to identify anything specific. I apprecia=
te
that the document discusses what happens when a bad-actor introduces
intentionally mis-configured flags.

Editorial Issues:

The Abstract is full of acronyms that are not universally understood, and i=
t
buries the point of the document. Please consider rewriting to focus more
specifically on the goal of the draft (see the introduction in the shepherd=
's
writeup), keeping in mind that the abstract should make sense to people who
don't know yet what PE stands for. Much of what you currently have in the
Abstract can be left to the Introduction. I expect a  shorter (two or three
sentence) abstract will suit the document better.
[Jorge] we simplified the abstract as follows, hopefully it addresses your =
comment:
   Ethernet Virtual Private Network (EVPN) uses MAC/IP Advertisement
   routes to advertise locally learned MAC and IP addresses associated
   to host or routers.  The remote Provider Edge (PE) routers may use
   this information to populate their Address Resolution Protocol (ARP)
   or Neighbor Discovery (ND) tables and then reply locally to ARP
   Requests or Neighbor Solicitation messages on behalf of the owner of
   the IP address.  However, the information conveyed in the MAC/IP
   route may not be enough for the remote PE to reply to local ARP or ND
   requests.  This document defines an Extended Community that is
   advertised along with an EVPN MAC/IP Advertisement route and carries
   information relevant to the ARP/ND resolution, so that an EVPN PE
   implementing a proxy-ARP/ND function can reply to ARP Requests or
   Neighbor Solicitations with the correct information.



In section 3.2: The list of three things in the list under "R and O Flags
processing" are all processing steps. But the list of 6 things under "I Fla=
g
processing" are not all processing steps. Please change the list to only
include processing steps, and move the examples and commentary to regular
paragraphs after the processing has been specified.

Consider moving the third top-level bullet in 3.2 ("MUST be ignored") to be=
 the
first bullet, and after that bullet say "otherwise".
[Jorge] ok, section 3.2 changed as follows:

3.2.  Reception of the EVPN ARP/ND Extended Community



   In addition to the procedures specified in [RFC7432] a PE receiving a

   MAC/IP Advertisement route will process the EVPN ARP/ND Extended

   Community as follows:



   o  The R, O and I Flags MUST be ignored if they are advertised along

      with an EVPN MAC/IP Advertisement route that does not contain an

      IP (IPv4 or IPv6) address.  Otherwise they are processed as

      follows.



   o  R and O Flags processing:



      *  If the EVPN MAC/IP Advertisement route contains an IPv6 address

         and the EVPN ARP/ND Extended Community, the PE MUST add the R

         and O Flags to the ND entry in the ND or proxy-ND table and use

         that information in Neighbor Advertisements when replying to a

         Solicitation for the IPv6 address.



      *  If no EVPN ARP/ND Extended Community is received along with the

         route, the PE will add the default R and O Flags to the entry.

         The default R Flag SHOULD be an administrative choice.  The

         default O Flag SHOULD be 1.



      *  A PE MUST ignore the received R and O Flags for an EVPN MAC/IP

         Advertisement route that contains an IPv4->MAC pair.



   o  I Flag processing:



      *  A PE receiving an EVPN MAC/IP Advertisement route containing an

         IP->MAC and the I Flag set SHOULD install the IP->MAC entry in

         the ARP/ND or proxy-ARP/ND table as an "Immutable binding".

         This Immutable binding entry will override an existing non-

         immutable binding for the same IP->MAC.  The absence of the

         EVPN ARP/ND Extended Community in a MAC/IP Advertisement route

         indicates that the IP->MAC entry is not an "Immutable binding".



      *  Receiving multiple EVPN MAC/IP Advertisement routes with I=3D1

         for the same IP but different MAC is considered a

         misconfiguration.



      *  A PE originating an EVPN MAC/IP Advertisement route for

         IP1->MAC1 with I=3D1 MAY also originate the route with the Static

         bit set (in the MAC Mobility Extended Community).  In such a

         case, the IP1->MAC1 binding is not only immutable but it cannot







Rabadan, et al.           Expires March 5, 2021                 [Page 6]



Internet-Draft      EVPN Neighbor Advertisement Flags     September 2020





         move as well.  Even so, if an update for the same IP1->MAC1

         immutable and static, is received from a different PE, one of

         the two routes will be selected, as in the [RFC7432] case where

         two MAC/IP routes with Static bit are received for the same MAC

         from different PEs.



   In a situation where a host (with an IP->MAC that is configured as

   Immutable binding in the attached PE) is allowed to move between PEs

   (that is, the associated MAC is non-static), PEs can receive multiple

   MAC/IP advertisement routes for the same IP->MAC.  In such

   situations, MAC mobility procedures as in [RFC7432] dictate the

   reachability of the MAC.



   As an example of the use of the I Flag, consider PE1, PE2 and PE3 are

   attached to the same BD.  PE1 originates an EVPN MAC/IP Advertisement

   route for IP1->MAC1 with I=3D1; later on, PE2 also originates an EVPN

   MAC/IP Advertisement route IP1->MAC1 with a higher sequence number

   and I=3D1.  Then all the EVPN PEs attached to the same BD SHOULD retain

   their IP1->MAC1 ARP/ND binding but update MAC1's forwarding

   destination to PE2.  If for some reason, PE3 originates an EVPN MAC/

   IP Advertisement route for IP1->MAC2 (even with a higher sequence

   number), then the EVPN PEs in the BD SHOULD NOT update their

   IP1->MAC1 ARP/ND bindings, since IP1 is bound to MAC1 (MAC2 SHOULD

   still be programmed in the layer-2 BDs).  This is considered a

   misconfiguration in PE3.



   The use of the Flag I=3D1 assumes that a given IP is always bound to

   the same MAC address, and therefore the mobility procedures described

   in [I-D.ietf-bess-evpn-irb-extended-mobility] for "Host IP move to a

   new MAC" will not apply.



Editorial Nits:

I suggest deleting "refers to" in the terminology sentences. In all cases y=
ou
mean "is" and you don't need to say "is".
[Jorge] ok, removed


The last phrase in the description of Bit 4 at the end of section 2 was
difficult to read. Consider breaking the sentence into two or more.
[Jorge] ok, changed to:

   Bit 4 of the Flags field is defined as the "Immutable ARP/ND Binding

   Flag".  When set, the egress PE indicates that the IP->MAC pair sent

   in an EVPN MAC/IP Advertisement route (along with the Extended

   Community) is a configured ARP/ND entry.  The IP address in the EVPN

   MAC/IP Advertisement route can only be bound together with the MAC

   address specified in the same route.



At the end of section 3.1, "does not have any impact on" is confusing. I th=
ink
you mean "does not change"? At ", including" the sentence becomes awkward. =
I
suggest breaking that into a separate sentence. Perhaps "Specifically the
procedures for advertising ... are not changed."
[Jorge] good point, changed as suggested.




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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Robert,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Thank you very much for the review. Great points.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Please see in-line with [Jorge]. All the changes will be included in the =
next revision.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Thank you!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Jorge<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><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=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:12.0pt;margin-left:36.0pt">
<b><span style=3D"font-size:12.0pt;color:black">From: </span></b><span styl=
e=3D"font-size:12.0pt;color:black">Robert Sparks via Datatracker &lt;norepl=
y@ietf.org&gt;<br>
<b>Date: </b>Tuesday, August 18, 2020 at 6:11 PM<br>
<b>To: </b>gen-art@ietf.org &lt;gen-art@ietf.org&gt;<br>
<b>Cc: </b>draft-ietf-bess-evpn-na-flags.all@ietf.org &lt;draft-ietf-bess-e=
vpn-na-flags.all@ietf.org&gt;, last-call@ietf.org &lt;last-call@ietf.org&gt=
;, bess@ietf.org &lt;bess@ietf.org&gt;<br>
<b>Subject: </b>Genart last call review of draft-ietf-bess-evpn-na-flags-05=
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:12.0pt;margin-left:36.0pt">
Reviewer: Robert Sparks<br>
Review result: Ready with Nits<br>
<br>
I am the assigned Gen-ART reviewer for this draft. The General Area<br>
Review Team (Gen-ART) reviews all IETF documents being processed<br>
by the IESG for the IETF Chair.&nbsp; Please treat these comments just<br>
like any other last call comments.<br>
<br>
For more information, please see the FAQ at<br>
<br>
&lt;<a href=3D"https://trac.ietf.org/trac/gen/wiki/GenArtfaq">https://trac.=
ietf.org/trac/gen/wiki/GenArtfaq</a>&gt;.<br>
<br>
Document: draft-ietf-bess-evpn-na-flags-05<br>
Reviewer: Robert Sparks<br>
Review Date: 2020-08-18<br>
IETF LC End Date: 2020-08-28<br>
IESG Telechat date: Not scheduled for a telechat<br>
<br>
Summary: Ready for publication as a Proposed Standard RFC but with nits to<=
br>
address before publication<br>
<br>
The protocol being defined seems fine, and the IANA considerations are well=
<br>
constructed. I have a nagging feeling that there are new security concerns =
this<br>
introduces, but haven't been able to identify anything specific. I apprecia=
te<br>
that the document discusses what happens when a bad-actor introduces<br>
intentionally mis-configured flags.<br>
<br>
Editorial Issues:<br>
<br>
The Abstract is full of acronyms that are not universally understood, and i=
t<br>
buries the point of the document. Please consider rewriting to focus more<b=
r>
specifically on the goal of the draft (see the introduction in the shepherd=
's<br>
writeup), keeping in mind that the abstract should make sense to people who=
<br>
don't know yet what PE stands for. Much of what you currently have in the<b=
r>
Abstract can be left to the Introduction. I expect a&nbsp; shorter (two or =
three<br>
sentence) abstract will suit the document better.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"font-s=
ize:10.5pt;font-family:Consolas">[Jorge] we simplified the abstract as foll=
ows, hopefully it addresses your comment:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; Ethernet Virtual Private Network =
(EVPN) uses MAC/IP Advertisement<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; routes to advertise locally learn=
ed MAC and IP addresses associated<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; to host or routers.&nbsp; The rem=
ote Provider Edge (PE) routers may use<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; this information to populate thei=
r Address Resolution Protocol (ARP)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; or Neighbor Discovery (ND) tables=
 and then reply locally to ARP<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; Requests or Neighbor Solicitation=
 messages on behalf of the owner of<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; the IP address.&nbsp; However, th=
e information conveyed in the MAC/IP<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; route may not be enough for the r=
emote PE to reply to local ARP or ND<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; requests.&nbsp; This document def=
ines an Extended Community that is<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; advertised along with an EVPN MAC=
/IP Advertisement route and carries<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; information relevant to the ARP/N=
D resolution, so that an EVPN PE<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; implementing a proxy-ARP/ND funct=
ion can reply to ARP Requests or<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; Neighbor Solicitations with the c=
orrect information.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"font-s=
ize:10.5pt;font-family:Consolas"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:12.0pt;margin-left:36.0pt">
<br>
<br>
In section 3.2: The list of three things in the list under &quot;R and O Fl=
ags<br>
processing&quot; are all processing steps. But the list of 6 things under &=
quot;I Flag<br>
processing&quot; are not all processing steps. Please change the list to on=
ly<br>
include processing steps, and move the examples and commentary to regular<b=
r>
paragraphs after the processing has been specified.<br>
<br>
Consider moving the third top-level bullet in 3.2 (&quot;MUST be ignored&qu=
ot;) to be the<br>
first bullet, and after that bullet say &quot;otherwise&quot;.<o:p></o:p></=
p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"font-s=
ize:10.5pt;font-family:Consolas">[Jorge] ok, section 3.2 changed as follows=
:<o:p></o:p></span></p>
<pre><span style=3D"color:black">3.2.&nbsp; Reception of the EVPN ARP/ND Ex=
tended Community<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; In addition to the procedures=
 specified in [RFC7432] a PE receiving a<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; MAC/IP Advertisement route wi=
ll process the EVPN ARP/ND Extended<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; Community as follows:<o:p></o=
:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; o&nbsp; The R, O and I Flags =
MUST be ignored if they are advertised along<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; with an EVP=
N MAC/IP Advertisement route that does not contain an<o:p></o:p></span></pr=
e>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; IP (IPv4 or=
 IPv6) address.&nbsp; Otherwise they are processed as<o:p></o:p></span></pr=
e>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; follows.<o:=
p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; o&nbsp; R and O Flags process=
ing:<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; *&nbsp; If =
the EVPN MAC/IP Advertisement route contains an IPv6 address<o:p></o:p></sp=
an></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; and the EVPN ARP/ND Extended Community, the PE MUST add the R<o:p></=
o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; and O Flags to the ND entry in the ND or proxy-ND table and use<o:p>=
</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; that information in Neighbor Advertisements when replying to a<o:p><=
/o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; Solicitation for the IPv6 address.<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; *&nbsp; If =
no EVPN ARP/ND Extended Community is received along with the<o:p></o:p></sp=
an></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; route, the PE will add the default R and O Flags to the entry.<o:p><=
/o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; The default R Flag SHOULD be an administrative choice.&nbsp; The<o:p=
></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; default O Flag SHOULD be 1.<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; *&nbsp; A P=
E MUST ignore the received R and O Flags for an EVPN MAC/IP<o:p></o:p></spa=
n></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; Advertisement route that contains an IPv4-&gt;MAC pair.<o:p></o:p></=
span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; o&nbsp; I Flag processing:<o:=
p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; *&nbsp; A P=
E receiving an EVPN MAC/IP Advertisement route containing an<o:p></o:p></sp=
an></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; IP-&gt;MAC and the I Flag set SHOULD install the IP-&gt;MAC entry in=
<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; the ARP/ND or proxy-ARP/ND table as an &quot;Immutable binding&quot;=
.<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; This Immutable binding entry will override an existing non-<o:p></o:=
p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; immutable binding for the same IP-&gt;MAC.&nbsp; The absence of the<=
o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; EVPN ARP/ND Extended Community in a MAC/IP Advertisement route<o:p><=
/o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; indicates that the IP-&gt;MAC entry is not an &quot;Immutable bindin=
g&quot;.<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; *&nbsp; Rec=
eiving multiple EVPN MAC/IP Advertisement routes with I=3D1<o:p></o:p></spa=
n></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; for the same IP but different MAC is considered a<o:p></o:p></span><=
/pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; misconfiguration.<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; *&nbsp; A P=
E originating an EVPN MAC/IP Advertisement route for<o:p></o:p></span></pre=
>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; IP1-&gt;MAC1 with I=3D1 MAY also originate the route with the Static=
<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; bit set (in the MAC Mobility Extended Community).&nbsp; In such a<o:=
p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; case, the IP1-&gt;MAC1 binding is not only immutable but it cannot<o=
:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">Rabadan, et al.&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Expires March 5, 2021&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
; [Page 6]<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">Internet-Draft&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p; EVPN Neighbor Advertisement Flags&nbsp;&nbsp;&nbsp;&nbsp; September 2020=
<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; move as well.&nbsp; Even so, if an update for the same IP1-&gt;MAC1<=
o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; immutable and static, is received from a different PE, one of<o:p></=
o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; the two routes will be selected, as in the [RFC7432] case where<o:p>=
</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; two MAC/IP routes with Static bit are received for the same MAC<o:p>=
</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; from different PEs.<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; In a situation where a host (=
with an IP-&gt;MAC that is configured as<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; Immutable binding in the atta=
ched PE) is allowed to move between PEs<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; (that is, the associated MAC =
is non-static), PEs can receive multiple<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; MAC/IP advertisement routes f=
or the same IP-&gt;MAC.&nbsp; In such<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; situations, MAC mobility proc=
edures as in [RFC7432] dictate the<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; reachability of the MAC.<o:p>=
</o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; As an example of the use of t=
he I Flag, consider PE1, PE2 and PE3 are<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; attached to the same BD.&nbsp=
; PE1 originates an EVPN MAC/IP Advertisement<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; route for IP1-&gt;MAC1 with I=
=3D1; later on, PE2 also originates an EVPN<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; MAC/IP Advertisement route IP=
1-&gt;MAC1 with a higher sequence number<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; and I=3D1.&nbsp; Then all the=
 EVPN PEs attached to the same BD SHOULD retain<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; their IP1-&gt;MAC1 ARP/ND bin=
ding but update MAC1's forwarding<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; destination to PE2.&nbsp; If =
for some reason, PE3 originates an EVPN MAC/<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; IP Advertisement route for IP=
1-&gt;MAC2 (even with a higher sequence<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; number), then the EVPN PEs in=
 the BD SHOULD NOT update their<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; IP1-&gt;MAC1 ARP/ND bindings,=
 since IP1 is bound to MAC1 (MAC2 SHOULD<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; still be programmed in the la=
yer-2 BDs).&nbsp; This is considered a<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; misconfiguration in PE3.<o:p>=
</o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; The use of the Flag I=3D1 ass=
umes that a given IP is always bound to<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; the same MAC address, and the=
refore the mobility procedures described<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; in [I-D.ietf-bess-evpn-irb-ex=
tended-mobility] for &quot;Host IP move to a<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; new MAC&quot; will not apply.=
<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"font-s=
ize:10.5pt;font-family:Consolas"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:12.0pt;margin-left:36.0pt">
<br>
<br>
Editorial Nits:<br>
<br>
I suggest deleting &quot;refers to&quot; in the terminology sentences. In a=
ll cases you<br>
mean &quot;is&quot; and you don't need to say &quot;is&quot;.<o:p></o:p></p=
>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"font-s=
ize:10.5pt;font-family:Consolas">[Jorge] ok, removed<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:12.0pt;margin-left:36.0pt">
<br>
<br>
The last phrase in the description of Bit 4 at the end of section 2 was<br>
difficult to read. Consider breaking the sentence into two or more.<o:p></o=
:p></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"font-s=
ize:10.5pt;font-family:Consolas">[Jorge] ok, changed to:<o:p></o:p></span><=
/p>
<pre><span style=3D"color:black">&nbsp;&nbsp; Bit 4 of the Flags field is d=
efined as the &quot;Immutable ARP/ND Binding<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; Flag&quot;.&nbsp; When set, t=
he egress PE indicates that the IP-&gt;MAC pair sent<o:p></o:p></span></pre=
>
<pre><span style=3D"color:black">&nbsp;&nbsp; in an EVPN MAC/IP Advertiseme=
nt route (along with the Extended<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; Community) is a configured AR=
P/ND entry.&nbsp; The IP address in the EVPN<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; MAC/IP Advertisement route ca=
n only be bound together with the MAC<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; address specified in the same=
 route.<o:p></o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"font-s=
ize:10.5pt;font-family:Consolas"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:12.0pt;margin-left:36.0pt">
<br>
<br>
At the end of section 3.1, &quot;does not have any impact on&quot; is confu=
sing. I think<br>
you mean &quot;does not change&quot;? At &quot;, including&quot; the senten=
ce becomes awkward. I<br>
suggest breaking that into a separate sentence. Perhaps &quot;Specifically =
the<br>
procedures for advertising ... are not changed.&quot;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"font-s=
ize:10.5pt;font-family:Consolas">[Jorge] good point, changed as suggested.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:12.0pt;margin-left:36.0pt">
<br>
<br>
<br>
<o:p></o:p></p>
</div>
</div>
</body>
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Subject: Re: [bess] Murray Kucherawy's Discuss on draft-ietf-bess-rfc5549revision-04: (with DISCUSS and COMMENT)
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Hi Murray,

I have uploaded a new revision that clarifies the IANA section.

-----Original Message-----
From: Murray Kucherawy via Datatracker <noreply@ietf.org>=20
Sent: mercredi 26 ao=C3=BBt 2020 21:01
To: The IESG <iesg@ietf.org>
Cc: draft-ietf-bess-rfc5549revision@ietf.org; bess-chairs@ietf.org; =
bess@ietf.org; Matthew Bocci <matthew.bocci@nokia.com>
Subject: Murray Kucherawy's Discuss on =
draft-ietf-bess-rfc5549revision-04: (with DISCUSS and COMMENT)

Murray Kucherawy has entered the following ballot position for
draft-ietf-bess-rfc5549revision-04: Discuss

When responding, please keep the subject line intact and reply to all =
email addresses included in the To and CC lines. (Feel free to cut this =
introductory paragraph, however.)


Please refer to =
https://www.ietf.org/iesg/statement/discuss-criteria.html
for more information about IESG DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-bess-rfc5549revision/



----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------

An easy one, but necessary IMHO:

I'm confused by the IANA Considerations section.  It looks like a =
verbatim copy from RFC 5549 which made the original registration for =
"Extended Next Hop Encoding", but this isn't actually a new =
registration.  Shouldn't this therefore be something like the following?

NEW:

RFC 5549 added "Extended Next Hop Encoding" to the Capability Codes =
registry, which was created by [RFC5492].  IANA is requested to update =
the definition of that entry to refer instead to this document.


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

Thanks for this document.  It was easy to read even for people like me =
who don't get involved in routing too much.

Thank you also for the shepherd writeup, which (unlike most lately) =
actually answered the question "Why is this the proper type of RFC?"





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From: "Murray S. Kucherawy" <superuser@gmail.com>
Date: Mon, 31 Aug 2020 01:53:08 -0700
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Subject: Re: [bess] Murray Kucherawy's Discuss on draft-ietf-bess-rfc5549revision-04: (with DISCUSS and COMMENT)
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--000000000000e7324d05ae2888ec
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Hi,

I saw the change.  However the text of that section still says "new"
twice.  Since the registration was made by RFC 5549, it isn't appropriate
to call it "new".

Any comments on the text I proposed in my DISCUSS?  It's more typical of
"bis" style work, in my experience.

-MSK

On Mon, Aug 31, 2020 at 1:49 AM <slitkows.ietf@gmail.com> wrote:

> Hi Murray,
>
> I have uploaded a new revision that clarifies the IANA section.
>
> -----Original Message-----
> From: Murray Kucherawy via Datatracker <noreply@ietf.org>
> Sent: mercredi 26 ao=C3=BBt 2020 21:01
> To: The IESG <iesg@ietf.org>
> Cc: draft-ietf-bess-rfc5549revision@ietf.org; bess-chairs@ietf.org;
> bess@ietf.org; Matthew Bocci <matthew.bocci@nokia.com>
> Subject: Murray Kucherawy's Discuss on draft-ietf-bess-rfc5549revision-04=
:
> (with DISCUSS and COMMENT)
>
> Murray Kucherawy has entered the following ballot position for
> draft-ietf-bess-rfc5549revision-04: Discuss
>
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut this
> introductory paragraph, however.)
>
>
> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
>
>
> The document, along with other ballot positions, can be found here:
> https://datatracker.ietf.org/doc/draft-ietf-bess-rfc5549revision/
>
>
>
> ----------------------------------------------------------------------
> DISCUSS:
> ----------------------------------------------------------------------
>
> An easy one, but necessary IMHO:
>
> I'm confused by the IANA Considerations section.  It looks like a verbati=
m
> copy from RFC 5549 which made the original registration for "Extended Nex=
t
> Hop Encoding", but this isn't actually a new registration.  Shouldn't thi=
s
> therefore be something like the following?
>
> NEW:
>
> RFC 5549 added "Extended Next Hop Encoding" to the Capability Codes
> registry, which was created by [RFC5492].  IANA is requested to update th=
e
> definition of that entry to refer instead to this document.
>
>
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>
> Thanks for this document.  It was easy to read even for people like me wh=
o
> don't get involved in routing too much.
>
> Thank you also for the shepherd writeup, which (unlike most lately)
> actually answered the question "Why is this the proper type of RFC?"
>
>
>
>
>

--000000000000e7324d05ae2888ec
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi,</div><div><br></div><div>I saw the change.=C2=A0 =
However the text of that section still says &quot;new&quot; twice.=C2=A0 Si=
nce the registration was made by RFC 5549, it isn&#39;t appropriate to call=
 it &quot;new&quot;.<br></div><div><br></div><div>Any comments on the text =
I proposed in my DISCUSS?=C2=A0 It&#39;s more typical of &quot;bis&quot; st=
yle work, in my experience.<br></div><div><br></div><div>-MSK<br></div></di=
v><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On M=
on, Aug 31, 2020 at 1:49 AM &lt;<a href=3D"mailto:slitkows.ietf@gmail.com">=
slitkows.ietf@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_=
quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,=
204);padding-left:1ex">Hi Murray,<br>
<br>
I have uploaded a new revision that clarifies the IANA section.<br>
<br>
-----Original Message-----<br>
From: Murray Kucherawy via Datatracker &lt;<a href=3D"mailto:noreply@ietf.o=
rg" target=3D"_blank">noreply@ietf.org</a>&gt; <br>
Sent: mercredi 26 ao=C3=BBt 2020 21:01<br>
To: The IESG &lt;<a href=3D"mailto:iesg@ietf.org" target=3D"_blank">iesg@ie=
tf.org</a>&gt;<br>
Cc: <a href=3D"mailto:draft-ietf-bess-rfc5549revision@ietf.org" target=3D"_=
blank">draft-ietf-bess-rfc5549revision@ietf.org</a>; <a href=3D"mailto:bess=
-chairs@ietf.org" target=3D"_blank">bess-chairs@ietf.org</a>; <a href=3D"ma=
ilto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a>; Matthew Bocci &lt;=
<a href=3D"mailto:matthew.bocci@nokia.com" target=3D"_blank">matthew.bocci@=
nokia.com</a>&gt;<br>
Subject: Murray Kucherawy&#39;s Discuss on draft-ietf-bess-rfc5549revision-=
04: (with DISCUSS and COMMENT)<br>
<br>
Murray Kucherawy has entered the following ballot position for<br>
draft-ietf-bess-rfc5549revision-04: Discuss<br>
<br>
When responding, please keep the subject line intact and reply to all email=
 addresses included in the To and CC lines. (Feel free to cut this introduc=
tory paragraph, however.)<br>
<br>
<br>
Please refer to <a href=3D"https://www.ietf.org/iesg/statement/discuss-crit=
eria.html" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/iesg/s=
tatement/discuss-criteria.html</a><br>
for more information about IESG DISCUSS and COMMENT positions.<br>
<br>
<br>
The document, along with other ballot positions, can be found here:<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-bess-rfc5549revision=
/" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/doc/dr=
aft-ietf-bess-rfc5549revision/</a><br>
<br>
<br>
<br>
----------------------------------------------------------------------<br>
DISCUSS:<br>
----------------------------------------------------------------------<br>
<br>
An easy one, but necessary IMHO:<br>
<br>
I&#39;m confused by the IANA Considerations section.=C2=A0 It looks like a =
verbatim copy from RFC 5549 which made the original registration for &quot;=
Extended Next Hop Encoding&quot;, but this isn&#39;t actually a new registr=
ation.=C2=A0 Shouldn&#39;t this therefore be something like the following?<=
br>
<br>
NEW:<br>
<br>
RFC 5549 added &quot;Extended Next Hop Encoding&quot; to the Capability Cod=
es registry, which was created by [RFC5492].=C2=A0 IANA is requested to upd=
ate the definition of that entry to refer instead to this document.<br>
<br>
<br>
----------------------------------------------------------------------<br>
COMMENT:<br>
----------------------------------------------------------------------<br>
<br>
Thanks for this document.=C2=A0 It was easy to read even for people like me=
 who don&#39;t get involved in routing too much.<br>
<br>
Thank you also for the shepherd writeup, which (unlike most lately) actuall=
y answered the question &quot;Why is this the proper type of RFC?&quot;<br>
<br>
<br>
<br>
<br>
</blockquote></div>

--000000000000e7324d05ae2888ec--


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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/9V3Q1zgOr9NsroEU5jt8kg6lJtQ>
Subject: Re: [bess] Intdir last call review of draft-ietf-bess-evpn-na-flags-05
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Thank you for reviewing, Ralf.
We=92ll leave the current normative language then. If anyone else has stron=
g opinions about it, we can discuss it.

Jorge

From: BESS <bess-bounces@ietf.org>
Date: Friday, August 28, 2020 at 6:29 PM
To: int-dir@ietf.org <int-dir@ietf.org>
Cc: last-call@ietf.org <last-call@ietf.org>, bess@ietf.org <bess@ietf.org>,=
 draft-ietf-bess-evpn-na-flags.all@ietf.org <draft-ietf-bess-evpn-na-flags.=
all@ietf.org>
Subject: [bess] Intdir last call review of draft-ietf-bess-evpn-na-flags-05
Reviewer: Ralf Weber
Review result: Ready

Moin!

I am an assigned INT directorate reviewer for draft-ietf-bess-evpn-na-flags=
.

These comments were written primarily for the benefit of the Internet Area
Directors. Document editors and shepherd(s) should treat these comments jus=
t
like they would treat comments from any other IETF contributors and resolve
them along with any other Last Call comments that have been received. For m=
ore
details on the INT Directorate, see
https://datatracker.ietf.org/group/intdir/about/

The draft does a very good job explaining the motivation, definition and us=
e of
the extended community flags with good and applicable examples. I personall=
y
would have used stronger (MUST) language for the R and O bits set to 0 on t=
he
IPv4->MAC transmission (3.1 sub point 2), but as these are optional anyway =
and
must be ignored by the receiver it really makes no difference.

So long
-Ralf



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

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<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Thank you for reviewing, Ralf.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">We=92ll leave the current normative language then. If anyone else has str=
ong opinions about it, we can discuss it.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Jorge<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
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gin-bottom:12.0pt;margin-left:36.0pt">
<b><span style=3D"font-size:12.0pt;color:black">From: </span></b><span styl=
e=3D"font-size:12.0pt;color:black">BESS &lt;bess-bounces@ietf.org&gt;<br>
<b>Date: </b>Friday, August 28, 2020 at 6:29 PM<br>
<b>To: </b>int-dir@ietf.org &lt;int-dir@ietf.org&gt;<br>
<b>Cc: </b>last-call@ietf.org &lt;last-call@ietf.org&gt;, bess@ietf.org &lt=
;bess@ietf.org&gt;, draft-ietf-bess-evpn-na-flags.all@ietf.org &lt;draft-ie=
tf-bess-evpn-na-flags.all@ietf.org&gt;<br>
<b>Subject: </b>[bess] Intdir last call review of draft-ietf-bess-evpn-na-f=
lags-05<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Reviewer: Ralf Weber<br=
>
Review result: Ready<br>
<br>
Moin!<br>
<br>
I am an assigned INT directorate reviewer for draft-ietf-bess-evpn-na-flags=
.<br>
<br>
These comments were written primarily for the benefit of the Internet Area<=
br>
Directors. Document editors and shepherd(s) should treat these comments jus=
t<br>
like they would treat comments from any other IETF contributors and resolve=
<br>
them along with any other Last Call comments that have been received. For m=
ore<br>
details on the INT Directorate, see<br>
<a href=3D"https://datatracker.ietf.org/group/intdir/about/">https://datatr=
acker.ietf.org/group/intdir/about/</a><br>
<br>
The draft does a very good job explaining the motivation, definition and us=
e of<br>
the extended community flags with good and applicable examples. I personall=
y<br>
would have used stronger (MUST) language for the R and O bits set to 0 on t=
he<br>
IPv4-&gt;MAC transmission (3.1 sub point 2), but as these are optional anyw=
ay and<br>
must be ignored by the receiver it really makes no difference.<br>
<br>
So long<br>
-Ralf<br>
<br>
<br>
<br>
_______________________________________________<br>
BESS mailing list<br>
BESS@ietf.org<br>
<a href=3D"https://www.ietf.org/mailman/listinfo/bess">https://www.ietf.org=
/mailman/listinfo/bess</a><o:p></o:p></p>
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From: <slitkows.ietf@gmail.com>
To: "'Rabadan, Jorge \(Nokia - US/Mountain View\)'" <jorge.rabadan@nokia.com>,  <draft-ietf-bess-evpn-pref-df@ietf.org>, <bess-chairs@ietf.org>, <bess@ietf.org>
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Subject: Re: [bess] Shepherd's Review of draft-ietf-bess-evpn-pref-df
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Hi Jorge,

=20

Please find additional feedback inline.

(Stripping things we agree on)

=20

Stephane

=20

=20

From: Rabadan, Jorge (Nokia - US/Mountain View) =
<jorge.rabadan@nokia.com>=20
Sent: vendredi 19 juin 2020 20:37
To: slitkows.ietf@gmail.com; draft-ietf-bess-evpn-pref-df@ietf.org; =
bess-chairs@ietf.org; bess@ietf.org
Subject: Re: Shepherd's Review of draft-ietf-bess-evpn-pref-df

=20

Hi Stephane,

=20

Thanks for the review and my apologies for the delay.

We just posted a new revision.

=20

As usual, very good points. Please see in-line.

=20

Thx

Jorge=20

=20

From: "slitkows.ietf@gmail.com <mailto:slitkows.ietf@gmail.com> " =
<slitkows.ietf@gmail.com <mailto:slitkows.ietf@gmail.com> >
Date: Wednesday, February 26, 2020 at 3:20 PM
To: "draft-ietf-bess-evpn-pref-df@ietf.org =
<mailto:draft-ietf-bess-evpn-pref-df@ietf.org> " =
<draft-ietf-bess-evpn-pref-df@ietf.org =
<mailto:draft-ietf-bess-evpn-pref-df@ietf.org> >, 'BESS' <bess@ietf.org =
<mailto:bess@ietf.org> >
Cc: "bess-chairs@ietf.org <mailto:bess-chairs@ietf.org> " =
<bess-chairs@ietf.org <mailto:bess-chairs@ietf.org> >
Subject: Shepherd's Review of draft-ietf-bess-evpn-pref-df
Resent-From: <alias-bounces@ietf.org <mailto:alias-bounces@ietf.org> >
Resent-To: <jorge.rabadan@nokia.com <mailto:jorge.rabadan@nokia.com> >, =
<senthil.sathappan@nokia.com <mailto:senthil.sathappan@nokia.com> >, =
<prz@juniper.net <mailto:prz@juniper.net> >, <wlin@juniper.net =
<mailto:wlin@juniper.net> >, <jdrake@juniper.net =
<mailto:jdrake@juniper.net> >, <sajassi@cisco.com =
<mailto:sajassi@cisco.com> >, <satyamoh@cisco.com =
<mailto:satyamoh@cisco.com> >
Resent-Date: Wednesday, February 26, 2020 at 3:20 PM

=20

=20

=20

Section 4.1:

        =E2=80=9C Note that, by default, the Highest-Preference is =
chosen for each

       ES or vES, however the ES configuration can be changed to the

       Lowest-Preference algorithm as long as this option is consistent

       in all the PEs in the ES.

I don=E2=80=99t think it is a good idea to open this modification. =
People can play with preference values to achieve the required behavior =
while always keeping high pref.

We have no way to ensure consistency, except if we advertise the =
behavior as part of the exct. Consistency of DF election is key and =
needs to be ensured as much as we can.

[Jorge] the idea is have the highest preference as default (maybe use =
normative language?), which means that it will work fine. Opening to =
lowest is to give more flexibility, knowing that if the user has to =
change the config from the default, they will do it in all the PEs of =
the ES.

=20

[SLI] I don=E2=80=99t think this is a good idea, consistency is really =
important, if you absolutely want to do both lowest and highest, you can =
allocate a new DF Alg for lowest so we ensure that everybody uses the =
same algorithm. But I don=E2=80=99t think this is necessary, having =
highest preference is enough. I don=E2=80=99t remember any feature using =
a preference that can do both highest and lowest, it is usually one or =
the other.

=20

=20

=20
=20
=E2=80=9CWhen PE3's vES2 comes back up, PE3 will start a boot-timer (if
       booting up) or hold-timer (if the port or EVC recovers).  That
       timer will allow some time for PE3 to receive the ES routes from
       PE1 and PE2. =C2=BB
=20
Are you changing the way the DF election works ? Usually, PE advertises =
its route and then wait to receive other routes.
[Jorge] those timers are on top of the FSM defined in RFC8584, e.g. we =
need to give some extra time before the ES goes up and we advertise the =
ES route, if the ES is configured with the DP capability. This is =
because the advertised preference and DP values may not be the same as =
the configured ones, and the =E2=80=98in-use=E2=80=99 values will depend =
on the other ES routes in the ES. If we advertise the ES route =
immediately after the ES is up, we may not have received the other ES =
routes and we don=E2=80=99t know what =E2=80=9Cin-use=E2=80=9D values to =
advertise in order to avoid preemption in the ES. I added some text on =
point 5 (section 4.3).
=20
=20
[SLI] As we are updating the FSM, could we have new state and events =
defined to update the FSM similarly as we have in RFC8584 ?
=20
What happens if all PEs on the ES are failing at the same time or the ES =
booting up on all the PEs at the same time ? you have no way to hear =
what is the pref from the remote.
[Jorge] The non-revertive capability makes sense when there is at least =
one PE alive in the ES and we don=E2=80=99t want to preempt it so that =
there is no traffic impact. If all the PEs fail, there is traffic impact =
anyway, so there is really no non-revertive behavior, but an =
initialization in all the PEs.
=20
[SLI] Let=E2=80=99s say that you have a CE attached to 3 PEs (same ESI). =
PE1 pref 100, PE2 pref 200, PE3 pref 300. PE1 to 3 are configured with =
DP set. PE4 is a remote PE.
T0:CE fails and boots up.
T1:PE1 to PE3 starts their HOLD_TIMER
T2: PE1 HOLD_TIMER expires,  advertises ES route and starts DF_TIMER
T3: PE4 discovers ES from PE1 and starts DF_TIMER
T4: PE2 HOLD_TIMER expires,  advertises ES route and starts DF_TIMER, =
does it advertises with Pref100 and DP=3D0 as it knows from PE1 route =
even if PE1 is not DF yet ?
=20
=20

=20

Brgds,

=20

Stephane

=20


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</o:shapelayout></xml><![endif]--></head><body lang=3DFR =
link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>Hi =
Jorge,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>Please find additional feedback =
inline.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>(Stripping things we agree =
on)<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'>Stephane<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><div><di=
v style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
lang=3DEN-US>From:</span></b><span lang=3DEN-US> Rabadan, Jorge (Nokia - =
US/Mountain View) &lt;jorge.rabadan@nokia.com&gt; <br><b>Sent:</b> =
vendredi 19 juin 2020 20:37<br><b>To:</b> slitkows.ietf@gmail.com; =
draft-ietf-bess-evpn-pref-df@ietf.org; bess-chairs@ietf.org; =
bess@ietf.org<br><b>Subject:</b> Re: Shepherd's Review of =
draft-ietf-bess-evpn-pref-df<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:10.5pt;font-family:Consolas'>Hi =
Stephane,<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:Consolas'><o:p>&nbsp;</o:p></span><=
/p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:Consolas'>Thanks for the review =
and my apologies for the delay.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:Consolas'>We just posted a new =
revision.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:Consolas'><o:p>&nbsp;</o:p></span><=
/p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:Consolas'>As usual, very good =
points. Please see in-line.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:Consolas'><o:p>&nbsp;</o:p></span><=
/p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:Consolas'>Thx<o:p></o:p></span></p>=
<p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:Consolas'>Jorge =
<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:Consolas'><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'>&quot;<a =
href=3D"mailto:slitkows.ietf@gmail.com">slitkows.ietf@gmail.com</a>&quot;=
 &lt;<a =
href=3D"mailto:slitkows.ietf@gmail.com">slitkows.ietf@gmail.com</a>&gt;<b=
r><b>Date: </b>Wednesday, February 26, 2020 at 3:20 PM<br><b>To: =
</b>&quot;<a =
href=3D"mailto:draft-ietf-bess-evpn-pref-df@ietf.org">draft-ietf-bess-evp=
n-pref-df@ietf.org</a>&quot; &lt;<a =
href=3D"mailto:draft-ietf-bess-evpn-pref-df@ietf.org">draft-ietf-bess-evp=
n-pref-df@ietf.org</a>&gt;, 'BESS' &lt;<a =
href=3D"mailto:bess@ietf.org">bess@ietf.org</a>&gt;<br><b>Cc: =
</b>&quot;<a =
href=3D"mailto:bess-chairs@ietf.org">bess-chairs@ietf.org</a>&quot; =
&lt;<a =
href=3D"mailto:bess-chairs@ietf.org">bess-chairs@ietf.org</a>&gt;<br><b>S=
ubject: </b>Shepherd's Review of =
draft-ietf-bess-evpn-pref-df<br><b>Resent-From: </b>&lt;<a =
href=3D"mailto:alias-bounces@ietf.org">alias-bounces@ietf.org</a>&gt;<br>=
<b>Resent-To: </b>&lt;<a =
href=3D"mailto:jorge.rabadan@nokia.com">jorge.rabadan@nokia.com</a>&gt;, =
&lt;<a =
href=3D"mailto:senthil.sathappan@nokia.com">senthil.sathappan@nokia.com</=
a>&gt;, &lt;<a href=3D"mailto:prz@juniper.net">prz@juniper.net</a>&gt;, =
&lt;<a href=3D"mailto:wlin@juniper.net">wlin@juniper.net</a>&gt;, &lt;<a =
href=3D"mailto:jdrake@juniper.net">jdrake@juniper.net</a>&gt;, &lt;<a =
href=3D"mailto:sajassi@cisco.com">sajassi@cisco.com</a>&gt;, &lt;<a =
href=3D"mailto:satyamoh@cisco.com">satyamoh@cisco.com</a>&gt;<br><b>Resen=
t-Date: </b>Wednesday, February 26, 2020 at 3:20 =
PM<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><span lang=3DEN-US><o:p>&nbsp;</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>Section =
4.1:<o:p></o:p></span></p><div style=3D'border:solid #CCCCCC =
1.0pt;padding:8.0pt 8.0pt 8.0pt 8.0pt'><pre =
style=3D'mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:7.9pt;marg=
in-left:36.0pt;background:#FFFDF5;word-break:break-all'><span =
lang=3DEN-US =
style=3D'color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
=E2=80=9C </span><span lang=3DEN-US =
style=3D'font-size:10.5pt;color:black'>Note that, by default, the =
Highest-Preference is chosen for each</span><span =
lang=3DEN-US><o:p></o:p></span></pre><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:7.9pt;marg=
in-left:36.0pt;background:#FFFDF5;word-break:break-all'><span =
lang=3DEN-US style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ES or vES, =
however the ES configuration can be changed to the</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:7.9pt;marg=
in-left:36.0pt;background:#FFFDF5;word-break:break-all'><span =
lang=3DEN-US style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Lowest-Preference =
algorithm as long as this option is consistent</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:7.9pt;marg=
in-left:36.0pt;background:#FFFDF5;word-break:break-all'><span =
lang=3DEN-US style=3D'font-size:10.5pt;font-family:"Courier =
New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; in all the PEs in =
the ES.</span><span lang=3DEN-US><o:p></o:p></span></p></div><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span lang=3DEN-US>I =
don=E2=80=99t think it is a good idea to open this modification. People =
can play with preference values to achieve the required behavior while =
always keeping high pref.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-left:36.0pt'><span lang=3DEN-US>We have no way to ensure =
consistency, except if we advertise the behavior as part of the exct. =
Consistency of DF election is key and needs to be ensured as much as we =
can.<o:p></o:p></span></p><p class=3DMsoNormal><b><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:Consolas'>[Jorge] the idea is have =
the highest preference as default (maybe use normative language?), which =
means that it will work fine. Opening to lowest is to give more =
flexibility, knowing that if the user has to change the config from the =
default, they will do it in all the PEs of the =
ES.<o:p></o:p></span></b></p><p class=3DMsoNormal><b><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></b></p><p class=3DMsoNormal><span =
lang=3DEN-US>[SLI] I don=E2=80=99t think this is a good idea, =
consistency is really important, if you absolutely want to do both =
lowest and highest, you can allocate a new DF Alg for lowest so we =
ensure that everybody uses the same algorithm. But I don=E2=80=99t think =
this is necessary, having highest preference is enough. I don=E2=80=99t =
remember any feature using a preference that can do both highest and =
lowest, it is usually one or the other.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal style=3D'margin-left:36.0pt'><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p><pre =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:black'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></pre><pre =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:black'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></pre><pre =
style=3D'margin-left:36.0pt'><span lang=3DEN-US>=E2=80=9C<span =
style=3D'color:black'>When PE3's vES2 comes back up, PE3 will start a =
boot-timer (if</span><o:p></o:p></span></pre><pre =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; booting up) =
or hold-timer (if the port or EVC recovers).&nbsp; That</span><span =
lang=3DEN-US><o:p></o:p></span></pre><pre =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; timer will =
allow some time for PE3 to receive the ES routes from</span><span =
lang=3DEN-US><o:p></o:p></span></pre><pre =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; PE1 and =
PE2.&nbsp;=C2=BB</span><span lang=3DEN-US><o:p></o:p></span></pre><pre =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:black'>&nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></pre><pre =
style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:black'>Are you changing the way the DF election works ? =
Usually, PE advertises its route and then wait to receive other =
routes.<o:p></o:p></span></pre><pre><b><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:Consolas'>[Jorge] those timers are =
on top of the FSM defined in RFC8584, e.g. we need to give some extra =
time before the ES goes up and we advertise the ES route, if the ES is =
configured with the DP capability. This is because the advertised =
preference and DP values may not be the same as the configured ones, and =
the =E2=80=98in-use=E2=80=99 values will depend on the other ES routes =
in the ES. If we advertise the ES route immediately after the ES is up, =
we may not have received the other ES routes and we don=E2=80=99t know =
what =E2=80=9Cin-use=E2=80=9D values to advertise in order to avoid =
preemption in the ES. I added some text on point 5 (section =
4.3).<o:p></o:p></span></b></pre><pre><b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></b></pre><pre><b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></b></pre><pre><b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>[SLI] As we =
are updating the FSM, could we have new state and events defined to =
update the FSM similarly as we have in RFC8584 =
?<o:p></o:p></span></b></pre><pre><b><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:Consolas'><o:p>&nbsp;</o:p></span><=
/b></pre><pre style=3D'margin-left:36.0pt'><span lang=3DEN-US =
style=3D'color:black'>What happens if all PEs on the ES are failing at =
the same time or the ES booting up on all the PEs at the same time ? you =
have no way to hear what is the pref from the =
remote.<o:p></o:p></span></pre><pre><b><span lang=3DEN-US =
style=3D'font-size:10.5pt;font-family:Consolas'>[Jorge] The =
non-revertive capability makes sense when there is at least one PE alive =
in the ES and we don=E2=80=99t want to preempt it so that there is no =
traffic impact. If all the PEs fail, there is traffic impact anyway, so =
there is really no non-revertive behavior, but an initialization in all =
the PEs.<o:p></o:p></span></b></pre><pre><b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></b></pre><pre><b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>[SLI] =
Let=E2=80=99s say that you have a CE attached to 3 PEs (same ESI). PE1 =
pref 100, PE2 pref 200, PE3 pref 300. PE1 to 3 are configured with DP =
set. PE4 is a remote PE.<o:p></o:p></span></b></pre><pre><b><span =
lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>T0:CE fails =
and boots up.<o:p></o:p></span></b></pre><pre><b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>T1:PE1 to =
PE3 starts their HOLD_TIMER<o:p></o:p></span></b></pre><pre><b><span =
lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>T2: PE1 =
HOLD_TIMER expires, =C2=A0advertises ES route and starts =
DF_TIMER<o:p></o:p></span></b></pre><pre><b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>T3: PE4 =
discovers ES from PE1 and starts =
DF_TIMER<o:p></o:p></span></b></pre><pre><b><span lang=3DEN-US =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>T4: PE2 =
HOLD_TIMER expires, =C2=A0advertises ES route and starts DF_TIMER, does =
it advertises with Pref100 and DP=3D0 as it knows from PE1 route even if =
PE1 is not DF yet ?<o:p></o:p></span></b></pre><pre><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></b></pre><pre style=3D'margin-left:36.0pt'><span =
style=3D'color:black'>&nbsp;</span><o:p></o:p></pre><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>Brgds,<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>Stephane<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></div></body></html>
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To: "Murray S. Kucherawy" <superuser@gmail.com>, "slitkows.ietf@gmail.com" <slitkows.ietf@gmail.com>
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From: Robert Sparks <rjsparks@nostrum.com>
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Subject: Re: [bess] Genart last call review of draft-ietf-bess-evpn-na-flags-05
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Thanks for considering my suggestions Jorge - your edits address all my 
concerns!

RjS

On 8/31/20 3:46 AM, Rabadan, Jorge (Nokia - US/Mountain View) wrote:
>
> Robert,
>
> Thank you very much for the review. Great points.
>
> Please see in-line with [Jorge]. All the changes will be included in 
> the next revision.
>
> Thank you!
>
> Jorge
>
> *From: *Robert Sparks via Datatracker <noreply@ietf.org>
> *Date: *Tuesday, August 18, 2020 at 6:11 PM
> *To: *gen-art@ietf.org <gen-art@ietf.org>
> *Cc: *draft-ietf-bess-evpn-na-flags.all@ietf.org 
> <draft-ietf-bess-evpn-na-flags.all@ietf.org>, last-call@ietf.org 
> <last-call@ietf.org>, bess@ietf.org <bess@ietf.org>
> *Subject: *Genart last call review of draft-ietf-bess-evpn-na-flags-05
>
> Reviewer: Robert Sparks
> Review result: Ready with Nits
>
> I am the assigned Gen-ART reviewer for this draft. The General Area
> Review Team (Gen-ART) reviews all IETF documents being processed
> by the IESG for the IETF Chair.  Please treat these comments just
> like any other last call comments.
>
> For more information, please see the FAQ at
>
> <https://trac.ietf.org/trac/gen/wiki/GenArtfaq>.
>
> Document: draft-ietf-bess-evpn-na-flags-05
> Reviewer: Robert Sparks
> Review Date: 2020-08-18
> IETF LC End Date: 2020-08-28
> IESG Telechat date: Not scheduled for a telechat
>
> Summary: Ready for publication as a Proposed Standard RFC but with nits to
> address before publication
>
> The protocol being defined seems fine, and the IANA considerations are 
> well
> constructed. I have a nagging feeling that there are new security 
> concerns this
> introduces, but haven't been able to identify anything specific. I 
> appreciate
> that the document discusses what happens when a bad-actor introduces
> intentionally mis-configured flags.
>
> Editorial Issues:
>
> The Abstract is full of acronyms that are not universally understood, 
> and it
> buries the point of the document. Please consider rewriting to focus more
> specifically on the goal of the draft (see the introduction in the 
> shepherd's
> writeup), keeping in mind that the abstract should make sense to 
> people who
> don't know yet what PE stands for. Much of what you currently have in the
> Abstract can be left to the Introduction. I expect a shorter (two or three
> sentence) abstract will suit the document better.
>
> [Jorge] we simplified the abstract as follows, hopefully it addresses 
> your comment:
>
>    Ethernet Virtual Private Network (EVPN) uses MAC/IP Advertisement
>
>    routes to advertise locally learned MAC and IP addresses associated
>
>    to host or routers.  The remote Provider Edge (PE) routers may use
>
>    this information to populate their Address Resolution Protocol (ARP)
>
>    or Neighbor Discovery (ND) tables and then reply locally to ARP
>
>    Requests or Neighbor Solicitation messages on behalf of the owner of
>
>    the IP address.  However, the information conveyed in the MAC/IP
>
>    route may not be enough for the remote PE to reply to local ARP or ND
>
>    requests.  This document defines an Extended Community that is
>
>    advertised along with an EVPN MAC/IP Advertisement route and carries
>
>    information relevant to the ARP/ND resolution, so that an EVPN PE
>
>    implementing a proxy-ARP/ND function can reply to ARP Requests or
>
>    Neighbor Solicitations with the correct information.
>
>
>
> In section 3.2: The list of three things in the list under "R and O Flags
> processing" are all processing steps. But the list of 6 things under 
> "I Flag
> processing" are not all processing steps. Please change the list to only
> include processing steps, and move the examples and commentary to regular
> paragraphs after the processing has been specified.
>
> Consider moving the third top-level bullet in 3.2 ("MUST be ignored") 
> to be the
> first bullet, and after that bullet say "otherwise".
>
> [Jorge] ok, section 3.2 changed as follows:
>
> 3.2.  Reception of the EVPN ARP/ND Extended Community
>    In addition to the procedures specified in [RFC7432] a PE receiving a
>    MAC/IP Advertisement route will process the EVPN ARP/ND Extended
>    Community as follows:
>    o  The R, O and I Flags MUST be ignored if they are advertised along
>       with an EVPN MAC/IP Advertisement route that does not contain an
>       IP (IPv4 or IPv6) address.  Otherwise they are processed as
>       follows.
>    o  R and O Flags processing:
>       *  If the EVPN MAC/IP Advertisement route contains an IPv6 address
>          and the EVPN ARP/ND Extended Community, the PE MUST add the R
>          and O Flags to the ND entry in the ND or proxy-ND table and use
>          that information in Neighbor Advertisements when replying to a
>          Solicitation for the IPv6 address.
>       *  If no EVPN ARP/ND Extended Community is received along with the
>          route, the PE will add the default R and O Flags to the entry.
>          The default R Flag SHOULD be an administrative choice.  The
>          default O Flag SHOULD be 1.
>       *  A PE MUST ignore the received R and O Flags for an EVPN MAC/IP
>          Advertisement route that contains an IPv4->MAC pair.
>    o  I Flag processing:
>       *  A PE receiving an EVPN MAC/IP Advertisement route containing an
>          IP->MAC and the I Flag set SHOULD install the IP->MAC entry in
>          the ARP/ND or proxy-ARP/ND table as an "Immutable binding".
>          This Immutable binding entry will override an existing non-
>          immutable binding for the same IP->MAC.  The absence of the
>          EVPN ARP/ND Extended Community in a MAC/IP Advertisement route
>          indicates that the IP->MAC entry is not an "Immutable binding".
>       *  Receiving multiple EVPN MAC/IP Advertisement routes with I=1
>          for the same IP but different MAC is considered a
>          misconfiguration.
>       *  A PE originating an EVPN MAC/IP Advertisement route for
>          IP1->MAC1 with I=1 MAY also originate the route with the Static
>          bit set (in the MAC Mobility Extended Community).  In such a
>          case, the IP1->MAC1 binding is not only immutable but it cannot
> Rabadan, et al.           Expires March 5, 2021                 [Page 6]
> Internet-Draft      EVPN Neighbor Advertisement Flags     September 2020
>          move as well.  Even so, if an update for the same IP1->MAC1
>          immutable and static, is received from a different PE, one of
>          the two routes will be selected, as in the [RFC7432] case where
>          two MAC/IP routes with Static bit are received for the same MAC
>          from different PEs.
>    In a situation where a host (with an IP->MAC that is configured as
>    Immutable binding in the attached PE) is allowed to move between PEs
>    (that is, the associated MAC is non-static), PEs can receive multiple
>    MAC/IP advertisement routes for the same IP->MAC.  In such
>    situations, MAC mobility procedures as in [RFC7432] dictate the
>    reachability of the MAC.
>    As an example of the use of the I Flag, consider PE1, PE2 and PE3 are
>    attached to the same BD.  PE1 originates an EVPN MAC/IP Advertisement
>    route for IP1->MAC1 with I=1; later on, PE2 also originates an EVPN
>    MAC/IP Advertisement route IP1->MAC1 with a higher sequence number
>    and I=1.  Then all the EVPN PEs attached to the same BD SHOULD retain
>    their IP1->MAC1 ARP/ND binding but update MAC1's forwarding
>    destination to PE2.  If for some reason, PE3 originates an EVPN MAC/
>    IP Advertisement route for IP1->MAC2 (even with a higher sequence
>    number), then the EVPN PEs in the BD SHOULD NOT update their
>    IP1->MAC1 ARP/ND bindings, since IP1 is bound to MAC1 (MAC2 SHOULD
>    still be programmed in the layer-2 BDs).  This is considered a
>    misconfiguration in PE3.
>    The use of the Flag I=1 assumes that a given IP is always bound to
>    the same MAC address, and therefore the mobility procedures described
>    in [I-D.ietf-bess-evpn-irb-extended-mobility] for "Host IP move to a
>    new MAC" will not apply.
>
>
>
> Editorial Nits:
>
> I suggest deleting "refers to" in the terminology sentences. In all 
> cases you
> mean "is" and you don't need to say "is".
>
> [Jorge] ok, removed
>
>
>
> The last phrase in the description of Bit 4 at the end of section 2 was
> difficult to read. Consider breaking the sentence into two or more.
>
> [Jorge] ok, changed to:
>
>    Bit 4 of the Flags field is defined as the "Immutable ARP/ND Binding
>    Flag".  When set, the egress PE indicates that the IP->MAC pair sent
>    in an EVPN MAC/IP Advertisement route (along with the Extended
>    Community) is a configured ARP/ND entry.  The IP address in the EVPN
>    MAC/IP Advertisement route can only be bound together with the MAC
>    address specified in the same route.
>
>
>
> At the end of section 3.1, "does not have any impact on" is confusing. 
> I think
> you mean "does not change"? At ", including" the sentence becomes 
> awkward. I
> suggest breaking that into a separate sentence. Perhaps "Specifically the
> procedures for advertising ... are not changed."
>
> [Jorge] good point, changed as suggested.
>
>
>
>

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    <p>Thanks for considering my suggestions Jorge - your edits address
      all my concerns!</p>
    <p>RjS<br>
    </p>
    <div class="moz-cite-prefix">On 8/31/20 3:46 AM, Rabadan, Jorge
      (Nokia - US/Mountain View) wrote:<br>
    </div>
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        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:Consolas">Robert,<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:Consolas"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:Consolas">Thank you very
            much for the review. Great points.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:Consolas">Please see
            in-line with [Jorge]. All the changes will be included in
            the next revision.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:Consolas">Thank you!<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:Consolas">Jorge<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:Consolas"><o:p> </o:p></span></p>
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style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt"><b><span
                style="font-size:12.0pt;color:black">From: </span></b><span
              style="font-size:12.0pt;color:black">Robert Sparks via
              Datatracker <a class="moz-txt-link-rfc2396E" href="mailto:noreply@ietf.org">&lt;noreply@ietf.org&gt;</a><br>
              <b>Date: </b>Tuesday, August 18, 2020 at 6:11 PM<br>
              <b>To: </b><a class="moz-txt-link-abbreviated" href="mailto:gen-art@ietf.org">gen-art@ietf.org</a> <a class="moz-txt-link-rfc2396E" href="mailto:gen-art@ietf.org">&lt;gen-art@ietf.org&gt;</a><br>
              <b>Cc: </b><a class="moz-txt-link-abbreviated" href="mailto:draft-ietf-bess-evpn-na-flags.all@ietf.org">draft-ietf-bess-evpn-na-flags.all@ietf.org</a>
              <a class="moz-txt-link-rfc2396E" href="mailto:draft-ietf-bess-evpn-na-flags.all@ietf.org">&lt;draft-ietf-bess-evpn-na-flags.all@ietf.org&gt;</a>,
              <a class="moz-txt-link-abbreviated" href="mailto:last-call@ietf.org">last-call@ietf.org</a> <a class="moz-txt-link-rfc2396E" href="mailto:last-call@ietf.org">&lt;last-call@ietf.org&gt;</a>,
              <a class="moz-txt-link-abbreviated" href="mailto:bess@ietf.org">bess@ietf.org</a> <a class="moz-txt-link-rfc2396E" href="mailto:bess@ietf.org">&lt;bess@ietf.org&gt;</a><br>
              <b>Subject: </b>Genart last call review of
              draft-ietf-bess-evpn-na-flags-05<o:p></o:p></span></p>
        </div>
        <div>
          <p class="MsoNormal"
style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt">Reviewer:
            Robert Sparks<br>
            Review result: Ready with Nits<br>
            <br>
            I am the assigned Gen-ART reviewer for this draft. The
            General Area<br>
            Review Team (Gen-ART) reviews all IETF documents being
            processed<br>
            by the IESG for the IETF Chair.  Please treat these comments
            just<br>
            like any other last call comments.<br>
            <br>
            For more information, please see the FAQ at<br>
            <br>
            &lt;<a href="https://trac.ietf.org/trac/gen/wiki/GenArtfaq"
              moz-do-not-send="true">https://trac.ietf.org/trac/gen/wiki/GenArtfaq</a>&gt;.<br>
            <br>
            Document: draft-ietf-bess-evpn-na-flags-05<br>
            Reviewer: Robert Sparks<br>
            Review Date: 2020-08-18<br>
            IETF LC End Date: 2020-08-28<br>
            IESG Telechat date: Not scheduled for a telechat<br>
            <br>
            Summary: Ready for publication as a Proposed Standard RFC
            but with nits to<br>
            address before publication<br>
            <br>
            The protocol being defined seems fine, and the IANA
            considerations are well<br>
            constructed. I have a nagging feeling that there are new
            security concerns this<br>
            introduces, but haven't been able to identify anything
            specific. I appreciate<br>
            that the document discusses what happens when a bad-actor
            introduces<br>
            intentionally mis-configured flags.<br>
            <br>
            Editorial Issues:<br>
            <br>
            The Abstract is full of acronyms that are not universally
            understood, and it<br>
            buries the point of the document. Please consider rewriting
            to focus more<br>
            specifically on the goal of the draft (see the introduction
            in the shepherd's<br>
            writeup), keeping in mind that the abstract should make
            sense to people who<br>
            don't know yet what PE stands for. Much of what you
            currently have in the<br>
            Abstract can be left to the Introduction. I expect a 
            shorter (two or three<br>
            sentence) abstract will suit the document better.<o:p></o:p></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              style="font-size:10.5pt;font-family:Consolas">[Jorge] we
              simplified the abstract as follows, hopefully it addresses
              your comment:<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:black">   Ethernet Virtual Private Network
              (EVPN) uses MAC/IP Advertisement<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:black">   routes to advertise locally
              learned MAC and IP addresses associated<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:black">   to host or routers.  The remote
              Provider Edge (PE) routers may use<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:black">   this information to populate
              their Address Resolution Protocol (ARP)<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:black">   or Neighbor Discovery (ND)
              tables and then reply locally to ARP<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:black">   Requests or Neighbor
              Solicitation messages on behalf of the owner of<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:black">   the IP address.  However, the
              information conveyed in the MAC/IP<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:black">   route may not be enough for the
              remote PE to reply to local ARP or ND<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:black">   requests.  This document defines
              an Extended Community that is<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:black">   advertised along with an EVPN
              MAC/IP Advertisement route and carries<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:black">   information relevant to the
              ARP/ND resolution, so that an EVPN PE<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:black">   implementing a proxy-ARP/ND
              function can reply to ARP Requests or<o:p></o:p></span></p>
          <p class="MsoNormal"><span
              style="font-size:10.0pt;font-family:&quot;Courier
              New&quot;;color:black">   Neighbor Solicitations with the
              correct information.<o:p></o:p></span></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              style="font-size:10.5pt;font-family:Consolas"><o:p> </o:p></span></p>
          <p class="MsoNormal"
style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt"><br>
            <br>
            In section 3.2: The list of three things in the list under
            "R and O Flags<br>
            processing" are all processing steps. But the list of 6
            things under "I Flag<br>
            processing" are not all processing steps. Please change the
            list to only<br>
            include processing steps, and move the examples and
            commentary to regular<br>
            paragraphs after the processing has been specified.<br>
            <br>
            Consider moving the third top-level bullet in 3.2 ("MUST be
            ignored") to be the<br>
            first bullet, and after that bullet say "otherwise".<o:p></o:p></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              style="font-size:10.5pt;font-family:Consolas">[Jorge] ok,
              section 3.2 changed as follows:<o:p></o:p></span></p>
          <pre><span style="color:black">3.2.  Reception of the EVPN ARP/ND Extended Community<o:p></o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black">   In addition to the procedures specified in [RFC7432] a PE receiving a<o:p></o:p></span></pre>
          <pre><span style="color:black">   MAC/IP Advertisement route will process the EVPN ARP/ND Extended<o:p></o:p></span></pre>
          <pre><span style="color:black">   Community as follows:<o:p></o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black">   o  The R, O and I Flags MUST be ignored if they are advertised along<o:p></o:p></span></pre>
          <pre><span style="color:black">      with an EVPN MAC/IP Advertisement route that does not contain an<o:p></o:p></span></pre>
          <pre><span style="color:black">      IP (IPv4 or IPv6) address.  Otherwise they are processed as<o:p></o:p></span></pre>
          <pre><span style="color:black">      follows.<o:p></o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black">   o  R and O Flags processing:<o:p></o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black">      *  If the EVPN MAC/IP Advertisement route contains an IPv6 address<o:p></o:p></span></pre>
          <pre><span style="color:black">         and the EVPN ARP/ND Extended Community, the PE MUST add the R<o:p></o:p></span></pre>
          <pre><span style="color:black">         and O Flags to the ND entry in the ND or proxy-ND table and use<o:p></o:p></span></pre>
          <pre><span style="color:black">         that information in Neighbor Advertisements when replying to a<o:p></o:p></span></pre>
          <pre><span style="color:black">         Solicitation for the IPv6 address.<o:p></o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black">      *  If no EVPN ARP/ND Extended Community is received along with the<o:p></o:p></span></pre>
          <pre><span style="color:black">         route, the PE will add the default R and O Flags to the entry.<o:p></o:p></span></pre>
          <pre><span style="color:black">         The default R Flag SHOULD be an administrative choice.  The<o:p></o:p></span></pre>
          <pre><span style="color:black">         default O Flag SHOULD be 1.<o:p></o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black">      *  A PE MUST ignore the received R and O Flags for an EVPN MAC/IP<o:p></o:p></span></pre>
          <pre><span style="color:black">         Advertisement route that contains an IPv4-&gt;MAC pair.<o:p></o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black">   o  I Flag processing:<o:p></o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black">      *  A PE receiving an EVPN MAC/IP Advertisement route containing an<o:p></o:p></span></pre>
          <pre><span style="color:black">         IP-&gt;MAC and the I Flag set SHOULD install the IP-&gt;MAC entry in<o:p></o:p></span></pre>
          <pre><span style="color:black">         the ARP/ND or proxy-ARP/ND table as an "Immutable binding".<o:p></o:p></span></pre>
          <pre><span style="color:black">         This Immutable binding entry will override an existing non-<o:p></o:p></span></pre>
          <pre><span style="color:black">         immutable binding for the same IP-&gt;MAC.  The absence of the<o:p></o:p></span></pre>
          <pre><span style="color:black">         EVPN ARP/ND Extended Community in a MAC/IP Advertisement route<o:p></o:p></span></pre>
          <pre><span style="color:black">         indicates that the IP-&gt;MAC entry is not an "Immutable binding".<o:p></o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black">      *  Receiving multiple EVPN MAC/IP Advertisement routes with I=1<o:p></o:p></span></pre>
          <pre><span style="color:black">         for the same IP but different MAC is considered a<o:p></o:p></span></pre>
          <pre><span style="color:black">         misconfiguration.<o:p></o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black">      *  A PE originating an EVPN MAC/IP Advertisement route for<o:p></o:p></span></pre>
          <pre><span style="color:black">         IP1-&gt;MAC1 with I=1 MAY also originate the route with the Static<o:p></o:p></span></pre>
          <pre><span style="color:black">         bit set (in the MAC Mobility Extended Community).  In such a<o:p></o:p></span></pre>
          <pre><span style="color:black">         case, the IP1-&gt;MAC1 binding is not only immutable but it cannot<o:p></o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black">Rabadan, et al.           Expires March 5, 2021                 [Page 6]<o:p></o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black">Internet-Draft      EVPN Neighbor Advertisement Flags     September 2020<o:p></o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black">         move as well.  Even so, if an update for the same IP1-&gt;MAC1<o:p></o:p></span></pre>
          <pre><span style="color:black">         immutable and static, is received from a different PE, one of<o:p></o:p></span></pre>
          <pre><span style="color:black">         the two routes will be selected, as in the [RFC7432] case where<o:p></o:p></span></pre>
          <pre><span style="color:black">         two MAC/IP routes with Static bit are received for the same MAC<o:p></o:p></span></pre>
          <pre><span style="color:black">         from different PEs.<o:p></o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black">   In a situation where a host (with an IP-&gt;MAC that is configured as<o:p></o:p></span></pre>
          <pre><span style="color:black">   Immutable binding in the attached PE) is allowed to move between PEs<o:p></o:p></span></pre>
          <pre><span style="color:black">   (that is, the associated MAC is non-static), PEs can receive multiple<o:p></o:p></span></pre>
          <pre><span style="color:black">   MAC/IP advertisement routes for the same IP-&gt;MAC.  In such<o:p></o:p></span></pre>
          <pre><span style="color:black">   situations, MAC mobility procedures as in [RFC7432] dictate the<o:p></o:p></span></pre>
          <pre><span style="color:black">   reachability of the MAC.<o:p></o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black">   As an example of the use of the I Flag, consider PE1, PE2 and PE3 are<o:p></o:p></span></pre>
          <pre><span style="color:black">   attached to the same BD.  PE1 originates an EVPN MAC/IP Advertisement<o:p></o:p></span></pre>
          <pre><span style="color:black">   route for IP1-&gt;MAC1 with I=1; later on, PE2 also originates an EVPN<o:p></o:p></span></pre>
          <pre><span style="color:black">   MAC/IP Advertisement route IP1-&gt;MAC1 with a higher sequence number<o:p></o:p></span></pre>
          <pre><span style="color:black">   and I=1.  Then all the EVPN PEs attached to the same BD SHOULD retain<o:p></o:p></span></pre>
          <pre><span style="color:black">   their IP1-&gt;MAC1 ARP/ND binding but update MAC1's forwarding<o:p></o:p></span></pre>
          <pre><span style="color:black">   destination to PE2.  If for some reason, PE3 originates an EVPN MAC/<o:p></o:p></span></pre>
          <pre><span style="color:black">   IP Advertisement route for IP1-&gt;MAC2 (even with a higher sequence<o:p></o:p></span></pre>
          <pre><span style="color:black">   number), then the EVPN PEs in the BD SHOULD NOT update their<o:p></o:p></span></pre>
          <pre><span style="color:black">   IP1-&gt;MAC1 ARP/ND bindings, since IP1 is bound to MAC1 (MAC2 SHOULD<o:p></o:p></span></pre>
          <pre><span style="color:black">   still be programmed in the layer-2 BDs).  This is considered a<o:p></o:p></span></pre>
          <pre><span style="color:black">   misconfiguration in PE3.<o:p></o:p></span></pre>
          <pre><span style="color:black"><o:p> </o:p></span></pre>
          <pre><span style="color:black">   The use of the Flag I=1 assumes that a given IP is always bound to<o:p></o:p></span></pre>
          <pre><span style="color:black">   the same MAC address, and therefore the mobility procedures described<o:p></o:p></span></pre>
          <pre><span style="color:black">   in [I-D.ietf-bess-evpn-irb-extended-mobility] for "Host IP move to a<o:p></o:p></span></pre>
          <pre><span style="color:black">   new MAC" will not apply.<o:p></o:p></span></pre>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              style="font-size:10.5pt;font-family:Consolas"><o:p> </o:p></span></p>
          <p class="MsoNormal"
style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt"><br>
            <br>
            Editorial Nits:<br>
            <br>
            I suggest deleting "refers to" in the terminology sentences.
            In all cases you<br>
            mean "is" and you don't need to say "is".<o:p></o:p></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              style="font-size:10.5pt;font-family:Consolas">[Jorge] ok,
              removed<o:p></o:p></span></p>
          <p class="MsoNormal"
style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt"><br>
            <br>
            The last phrase in the description of Bit 4 at the end of
            section 2 was<br>
            difficult to read. Consider breaking the sentence into two
            or more.<o:p></o:p></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              style="font-size:10.5pt;font-family:Consolas">[Jorge] ok,
              changed to:<o:p></o:p></span></p>
          <pre><span style="color:black">   Bit 4 of the Flags field is defined as the "Immutable ARP/ND Binding<o:p></o:p></span></pre>
          <pre><span style="color:black">   Flag".  When set, the egress PE indicates that the IP-&gt;MAC pair sent<o:p></o:p></span></pre>
          <pre><span style="color:black">   in an EVPN MAC/IP Advertisement route (along with the Extended<o:p></o:p></span></pre>
          <pre><span style="color:black">   Community) is a configured ARP/ND entry.  The IP address in the EVPN<o:p></o:p></span></pre>
          <pre><span style="color:black">   MAC/IP Advertisement route can only be bound together with the MAC<o:p></o:p></span></pre>
          <pre><span style="color:black">   address specified in the same route.<o:p></o:p></span></pre>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              style="font-size:10.5pt;font-family:Consolas"><o:p> </o:p></span></p>
          <p class="MsoNormal"
style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt"><br>
            <br>
            At the end of section 3.1, "does not have any impact on" is
            confusing. I think<br>
            you mean "does not change"? At ", including" the sentence
            becomes awkward. I<br>
            suggest breaking that into a separate sentence. Perhaps
            "Specifically the<br>
            procedures for advertising ... are not changed."<o:p></o:p></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><span
              style="font-size:10.5pt;font-family:Consolas">[Jorge] good
              point, changed as suggested.<o:p></o:p></span></p>
          <p class="MsoNormal"
style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt"><br>
            <br>
            <br>
            <o:p></o:p></p>
        </div>
      </div>
    </blockquote>
  </body>
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Subject: [bess] I-D Action: draft-ietf-bess-evpn-per-mcast-flow-df-election-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 BGP Enabled ServiceS WG of the IETF.

        Title           : Per multicast flow Designated Forwarder Election for EVPN
        Authors         : Ali Sajassi
                          Mankamana Mishra
                          Samir Thoria
                          Jorge Rabadan
                          John Drake
	Filename        : draft-ietf-bess-evpn-per-mcast-flow-df-election-04.txt
	Pages           : 12
	Date            : 2020-08-31

Abstract:
   [RFC7432] describes mechanism to elect designated forwarder (DF) at
   the granularity of (ESI, EVI) which is per VLAN (or per group of
   VLANs in case of VLAN bundle or VLAN-aware bundle service).  However,
   the current level of granularity of per-VLAN is not adequate for some
   applications.[I-D.ietf-bess-evpn-df-election-framework] improves base
   line DF election by introducing HRW DF election.
   [I-D.ietf-bess-evpn-igmp-mld-proxy] introduces applicability of EVPN
   to Multicast flows, routes to sync them and a default DF election.
   This document is an extension to HRW base draft
   [I-D.ietf-bess-evpn-df-election-framework] and further enhances HRW
   algorithm for the Multicast flows to do DF election at the
   granularity of (ESI, VLAN, Mcast flow).


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-evpn-per-mcast-flow-df-election/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-evpn-per-mcast-flow-df-election-04
https://datatracker.ietf.org/doc/html/draft-ietf-bess-evpn-per-mcast-flow-df-election-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-evpn-per-mcast-flow-df-election-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: "Ali Sajassi (sajassi)" <sajassi@cisco.com>
To: "Eric Vyncke (evyncke)" <evyncke@cisco.com>, The IESG <iesg@ietf.org>
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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: "slitkows.ietf@gmail.com" <slitkows.ietf@gmail.com>, "draft-ietf-bess-evpn-pref-df@ietf.org" <draft-ietf-bess-evpn-pref-df@ietf.org>, "bess-chairs@ietf.org" <bess-chairs@ietf.org>, "bess@ietf.org" <bess@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/9E5XMVyB6zq7bYX1MlCjtwsD9dU>
Subject: Re: [bess] Shepherd's Review of draft-ietf-bess-evpn-pref-df
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--_000_MWHPR08MB3520F6DDC633ED95F9DB046FF72E0MWHPR08MB3520namp_
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Hi Stephane,

Please see in-line with [jorge2].
Thank you!
Jorge

From: slitkows.ietf@gmail.com <slitkows.ietf@gmail.com>
Date: Monday, August 31, 2020 at 11:49 AM
To: Rabadan, Jorge (Nokia - US/Mountain View) <jorge.rabadan@nokia.com>, dr=
aft-ietf-bess-evpn-pref-df@ietf.org <draft-ietf-bess-evpn-pref-df@ietf.org>=
, bess-chairs@ietf.org <bess-chairs@ietf.org>, bess@ietf.org <bess@ietf.org=
>
Subject: RE: Shepherd's Review of draft-ietf-bess-evpn-pref-df
Hi Jorge,

Please find additional feedback inline.
(Stripping things we agree on)

Stephane


From: Rabadan, Jorge (Nokia - US/Mountain View) <jorge.rabadan@nokia.com>
Sent: vendredi 19 juin 2020 20:37
To: slitkows.ietf@gmail.com; draft-ietf-bess-evpn-pref-df@ietf.org; bess-ch=
airs@ietf.org; bess@ietf.org
Subject: Re: Shepherd's Review of draft-ietf-bess-evpn-pref-df

Hi Stephane,

Thanks for the review and my apologies for the delay.
We just posted a new revision.

As usual, very good points. Please see in-line.

Thx
Jorge

From: "slitkows.ietf@gmail.com<mailto:slitkows.ietf@gmail.com>" <slitkows.i=
etf@gmail.com<mailto:slitkows.ietf@gmail.com>>
Date: Wednesday, February 26, 2020 at 3:20 PM
To: "draft-ietf-bess-evpn-pref-df@ietf.org<mailto:draft-ietf-bess-evpn-pref=
-df@ietf.org>" <draft-ietf-bess-evpn-pref-df@ietf.org<mailto:draft-ietf-bes=
s-evpn-pref-df@ietf.org>>, 'BESS' <bess@ietf.org<mailto:bess@ietf.org>>
Cc: "bess-chairs@ietf.org<mailto:bess-chairs@ietf.org>" <bess-chairs@ietf.o=
rg<mailto:bess-chairs@ietf.org>>
Subject: Shepherd's Review of draft-ietf-bess-evpn-pref-df
Resent-From: <alias-bounces@ietf.org<mailto:alias-bounces@ietf.org>>
Resent-To: <jorge.rabadan@nokia.com<mailto:jorge.rabadan@nokia.com>>, <sent=
hil.sathappan@nokia.com<mailto:senthil.sathappan@nokia.com>>, <prz@juniper.=
net<mailto:prz@juniper.net>>, <wlin@juniper.net<mailto:wlin@juniper.net>>, =
<jdrake@juniper.net<mailto:jdrake@juniper.net>>, <sajassi@cisco.com<mailto:=
sajassi@cisco.com>>, <satyamoh@cisco.com<mailto:satyamoh@cisco.com>>
Resent-Date: Wednesday, February 26, 2020 at 3:20 PM



Section 4.1:

        =93 Note that, by default, the Highest-Preference is chosen for eac=
h
       ES or vES, however the ES configuration can be changed to the
       Lowest-Preference algorithm as long as this option is consistent
       in all the PEs in the ES.
I don=92t think it is a good idea to open this modification. People can pla=
y with preference values to achieve the required behavior while always keep=
ing high pref.
We have no way to ensure consistency, except if we advertise the behavior a=
s part of the exct. Consistency of DF election is key and needs to be ensur=
ed as much as we can.
[Jorge] the idea is have the highest preference as default (maybe use norma=
tive language?), which means that it will work fine. Opening to lowest is t=
o give more flexibility, knowing that if the user has to change the config =
from the default, they will do it in all the PEs of the ES.

[SLI] I don=92t think this is a good idea, consistency is really important,=
 if you absolutely want to do both lowest and highest, you can allocate a n=
ew DF Alg for lowest so we ensure that everybody uses the same algorithm. B=
ut I don=92t think this is necessary, having highest preference is enough. =
I don=92t remember any feature using a preference that can do both highest =
and lowest, it is usually one or the other.


[Jorge2] ok, we can leave just the highest-preference in section 4.1. We=92=
ll fix it in the next revision. Note that in 4.2 we still need to have high=
est and lowest pref per ethernet tag range to make sure there is load balan=
cing.








=93When PE3's vES2 comes back up, PE3 will start a boot-timer (if

       booting up) or hold-timer (if the port or EVC recovers).  That

       timer will allow some time for PE3 to receive the ES routes from

       PE1 and PE2. =BB



Are you changing the way the DF election works ? Usually, PE advertises its=
 route and then wait to receive other routes.

[Jorge] those timers are on top of the FSM defined in RFC8584, e.g. we need=
 to give some extra time before the ES goes up and we advertise the ES rout=
e, if the ES is configured with the DP capability. This is because the adve=
rtised preference and DP values may not be the same as the configured ones,=
 and the =91in-use=92 values will depend on the other ES routes in the ES. =
If we advertise the ES route immediately after the ES is up, we may not hav=
e received the other ES routes and we don=92t know what =93in-use=94 values=
 to advertise in order to avoid preemption in the ES. I added some text on =
point 5 (section 4.3).





[SLI] As we are updating the FSM, could we have new state and events define=
d to update the FSM similarly as we have in RFC8584 ?
[jorge2] not sure if we should update the FSM, the reason being that those =
hold timers are generic for any redundancy mechanism, to avoid attracting t=
raffic from the access before the core IGP/BGP are up and have all the requ=
ired routes available. Some implementations use fixed timers, others config=
urable timers, others watch when the IGP/BGP come up and leave an additiona=
l delta. I thought the current text is generic enough to allow all those im=
plementations.





What happens if all PEs on the ES are failing at the same time or the ES bo=
oting up on all the PEs at the same time ? you have no way to hear what is =
the pref from the remote.

[Jorge] The non-revertive capability makes sense when there is at least one=
 PE alive in the ES and we don=92t want to preempt it so that there is no t=
raffic impact. If all the PEs fail, there is traffic impact anyway, so ther=
e is really no non-revertive behavior, but an initialization in all the PEs=
.



[SLI] Let=92s say that you have a CE attached to 3 PEs (same ESI). PE1 pref=
 100, PE2 pref 200, PE3 pref 300. PE1 to 3 are configured with DP set. PE4 =
is a remote PE.

T0:CE fails and boots up.

T1:PE1 to PE3 starts their HOLD_TIMER

T2: PE1 HOLD_TIMER expires,  advertises ES route and starts DF_TIMER

T3: PE4 discovers ES from PE1 and starts DF_TIMER
[jorge2] I assume you mean PE3 here.

T4: PE2 HOLD_TIMER expires,  advertises ES route and starts DF_TIMER, does =
it advertises with Pref100 and DP=3D0 as it knows from PE1 route even if PE=
1 is not DF yet ?
[jorge2] this is an example in which all PEs are =91initializing=92 at the =
same time, so there is traffic impact anyway because the CE reboots. So it =
would be more like an initialization example. Nevertheless, PE2 in this cas=
e should advertise the ES route with in-use pref 100 and DP=3D0.





Brgds,

Stephane


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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Hi Stephane,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Please see in-line with [jorge2].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Thank you!<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Jorge<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><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=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:12.0pt;margin-left:36.0pt">
<b><span style=3D"font-size:12.0pt;color:black">From: </span></b><span styl=
e=3D"font-size:12.0pt;color:black">slitkows.ietf@gmail.com &lt;slitkows.iet=
f@gmail.com&gt;<br>
<b>Date: </b>Monday, August 31, 2020 at 11:49 AM<br>
<b>To: </b>Rabadan, Jorge (Nokia - US/Mountain View) &lt;jorge.rabadan@noki=
a.com&gt;, draft-ietf-bess-evpn-pref-df@ietf.org &lt;draft-ietf-bess-evpn-p=
ref-df@ietf.org&gt;, bess-chairs@ietf.org &lt;bess-chairs@ietf.org&gt;, bes=
s@ietf.org &lt;bess@ietf.org&gt;<br>
<b>Subject: </b>RE: Shepherd's Review of draft-ietf-bess-evpn-pref-df<o:p><=
/o:p></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Hi Jorge,<o:p></o:p></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Please find additional =
feedback inline.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">(Stripping things we ag=
ree on)<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Stephane<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b>From:</b> Rabadan, J=
orge (Nokia - US/Mountain View) &lt;jorge.rabadan@nokia.com&gt;
<br>
<b>Sent:</b> vendredi 19 juin 2020 20:37<br>
<b>To:</b> slitkows.ietf@gmail.com; draft-ietf-bess-evpn-pref-df@ietf.org; =
bess-chairs@ietf.org; bess@ietf.org<br>
<b>Subject:</b> Re: Shepherd's Review of draft-ietf-bess-evpn-pref-df<o:p><=
/o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">Hi Stephane,</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">Thanks for the review and my apologies for t=
he delay.</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">We just posted a new revision.</span><o:p></=
o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">As usual, very good points. Please see in-li=
ne.</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">Thx</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">Jorge
</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">&nbsp;</span><o:p></o:p></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"><b><span style=3D"font-=
size:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">&quot;<a href=3D"ma=
ilto:slitkows.ietf@gmail.com">slitkows.ietf@gmail.com</a>&quot; &lt;<a href=
=3D"mailto:slitkows.ietf@gmail.com">slitkows.ietf@gmail.com</a>&gt;<br>
<b>Date: </b>Wednesday, February 26, 2020 at 3:20 PM<br>
<b>To: </b>&quot;<a href=3D"mailto:draft-ietf-bess-evpn-pref-df@ietf.org">d=
raft-ietf-bess-evpn-pref-df@ietf.org</a>&quot; &lt;<a href=3D"mailto:draft-=
ietf-bess-evpn-pref-df@ietf.org">draft-ietf-bess-evpn-pref-df@ietf.org</a>&=
gt;, 'BESS' &lt;<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>&gt;<br>
<b>Cc: </b>&quot;<a href=3D"mailto:bess-chairs@ietf.org">bess-chairs@ietf.o=
rg</a>&quot; &lt;<a href=3D"mailto:bess-chairs@ietf.org">bess-chairs@ietf.o=
rg</a>&gt;<br>
<b>Subject: </b>Shepherd's Review of draft-ietf-bess-evpn-pref-df<br>
<b>Resent-From: </b>&lt;<a href=3D"mailto:alias-bounces@ietf.org">alias-bou=
nces@ietf.org</a>&gt;<br>
<b>Resent-To: </b>&lt;<a href=3D"mailto:jorge.rabadan@nokia.com">jorge.raba=
dan@nokia.com</a>&gt;, &lt;<a href=3D"mailto:senthil.sathappan@nokia.com">s=
enthil.sathappan@nokia.com</a>&gt;, &lt;<a href=3D"mailto:prz@juniper.net">=
prz@juniper.net</a>&gt;, &lt;<a href=3D"mailto:wlin@juniper.net">wlin@junip=
er.net</a>&gt;,
 &lt;<a href=3D"mailto:jdrake@juniper.net">jdrake@juniper.net</a>&gt;, &lt;=
<a href=3D"mailto:sajassi@cisco.com">sajassi@cisco.com</a>&gt;, &lt;<a href=
=3D"mailto:satyamoh@cisco.com">satyamoh@cisco.com</a>&gt;<br>
<b>Resent-Date: </b>Wednesday, February 26, 2020 at 3:20 PM</span><o:p></o:=
p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">Section 4.1:<o:p></o:p>=
</p>
<div style=3D"border:solid #CCCCCC 1.0pt;padding:8.0pt 8.0pt 8.0pt 8.0pt">
<pre style=3D"mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:7.9pt;m=
argin-left:72.0pt;background:#FFFDF5;word-break:break-all"><span style=3D"c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =93 </span><span sty=
le=3D"font-size:10.5pt;color:black">Note that, by default, the Highest-Pref=
erence is chosen for each</span><o:p></o:p></pre>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:7.9pt;margin-left:72.0pt;background:#FFFDF5;word-break:break-all=
">
<span style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:b=
lack">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ES or vES, however the ES config=
uration can be changed to the</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:7.9pt;margin-left:72.0pt;background:#FFFDF5;word-break:break-all=
">
<span style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:b=
lack">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Lowest-Preference algorithm as l=
ong as this option is consistent</span><o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:7.9pt;margin-left:72.0pt;background:#FFFDF5;word-break:break-all=
">
<span style=3D"font-size:10.5pt;font-family:&quot;Courier New&quot;;color:b=
lack">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; in all the PEs in the ES.</span>=
<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">I don=92t think it is a=
 good idea to open this modification. People can play with preference value=
s to achieve the required behavior while always keeping high pref.<o:p></o:=
p></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">We have no way to ensur=
e consistency, except if we advertise the behavior as part of the exct. Con=
sistency of DF election is key and needs to be ensured as much as we can.<o=
:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span style=3D"font-=
size:10.5pt;font-family:Consolas">[Jorge] the idea is have the highest pref=
erence as default (maybe use normative language?), which means that it will=
 work fine. Opening to lowest is to give
 more flexibility, knowing that if the user has to change the config from t=
he default, they will do it in all the PEs of the ES.</span></b><o:p></o:p>=
</p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b>&nbsp;</b><o:p></o:p=
></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">[SLI] I don=92t think t=
his is a good idea, consistency is really important, if you absolutely want=
 to do both lowest and highest, you can allocate a new DF Alg for lowest so=
 we ensure that everybody uses the same
 algorithm. But I don=92t think this is necessary, having highest preferenc=
e is enough. I don=92t remember any feature using a preference that can do =
both highest and lowest, it is usually one or the other.<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
;color:red"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.5pt;font-family:Conso=
las"><o:p>&nbsp;</o:p></span></b></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.5pt;font-family:Conso=
las;color:red">[Jorge2] ok, we can leave just the highest-preference in sec=
tion 4.1. We=92ll fix it in the next revision. Note that in 4.2 we still ne=
ed to have highest and lowest pref per
 ethernet tag range to make sure there is load balancing.</span></b><b><o:p=
></o:p></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">&nbsp;<o:p></o:p></p>
<pre style=3D"margin-left:72.0pt"><span style=3D"color:black">&nbsp;</span>=
<o:p></o:p></pre>
<pre style=3D"margin-left:72.0pt"><span style=3D"color:black">&nbsp;</span>=
<o:p></o:p></pre>
<pre style=3D"margin-left:72.0pt">=93<span style=3D"color:black">When PE3's=
 vES2 comes back up, PE3 will start a boot-timer (if</span><o:p></o:p></pre=
>
<pre style=3D"margin-left:72.0pt"><span style=3D"color:black">&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; booting up) or hold-timer (if the port or EVC recov=
ers).&nbsp; That</span><o:p></o:p></pre>
<pre style=3D"margin-left:72.0pt"><span style=3D"color:black">&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; timer will allow some time for PE3 to receive the E=
S routes from</span><o:p></o:p></pre>
<pre style=3D"margin-left:72.0pt"><span style=3D"color:black">&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; PE1 and PE2.&nbsp;=BB</span><o:p></o:p></pre>
<pre style=3D"margin-left:72.0pt"><span style=3D"color:black">&nbsp;</span>=
<o:p></o:p></pre>
<pre style=3D"margin-left:72.0pt"><span style=3D"color:black">Are you chang=
ing the way the DF election works ? Usually, PE advertises its route and th=
en wait to receive other routes.</span><o:p></o:p></pre>
<pre style=3D"margin-left:36.0pt"><b><span style=3D"font-size:10.5pt;font-f=
amily:Consolas">[Jorge] those timers are on top of the FSM defined in RFC85=
84, e.g. we need to give some extra time before the ES goes up and we adver=
tise the ES route, if the ES is configured with the DP capability. This is =
because the advertised preference and DP values may not be the same as the =
configured ones, and the =91in-use=92 values will depend on the other ES ro=
utes in the ES. If we advertise the ES route immediately after the ES is up=
, we may not have received the other ES routes and we don=92t know what =93=
in-use=94 values to advertise in order to avoid preemption in the ES. I add=
ed some text on point 5 (section 4.3).</span></b><o:p></o:p></pre>
<pre style=3D"margin-left:36.0pt"><b><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">&nbsp;</span></b><o:p></o:p></pre>
<pre style=3D"margin-left:36.0pt"><b><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">&nbsp;</span></b><o:p></o:p></pre>
<pre style=3D"margin-left:36.0pt"><b><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">[SLI] As we are updating the FSM, cou=
ld we have new state and events defined to update the FSM similarly as we h=
ave in RFC8584 ?<o:p></o:p></span></b></pre>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.5pt;font-family:Conso=
las;color:red">[jorge2] not sure if we should update the FSM, the reason be=
ing that those hold timers are generic for any redundancy mechanism, to avo=
id attracting traffic from the access
 before the core IGP/BGP are up and have all the required routes available.=
 Some implementations use fixed timers, others configurable timers, others =
watch when the IGP/BGP come up and leave an additional delta. I thought the=
 current text is generic enough
 to allow all those implementations.</span></b><span style=3D"font-size:10.=
0pt;font-family:&quot;Courier New&quot;;color:black"><o:p></o:p></span></p>
<pre><span style=3D"font-size:10.5pt;font-family:Consolas"><o:p>&nbsp;</o:p=
></span></pre>
<pre style=3D"margin-left:36.0pt"><b><span style=3D"font-size:10.5pt;font-f=
amily:Consolas">&nbsp;</span></b><o:p></o:p></pre>
<pre style=3D"margin-left:72.0pt"><span style=3D"color:black">What happens =
if all PEs on the ES are failing at the same time or the ES booting up on a=
ll the PEs at the same time ? you have no way to hear what is the pref from=
 the remote.</span><o:p></o:p></pre>
<pre style=3D"margin-left:36.0pt"><b><span style=3D"font-size:10.5pt;font-f=
amily:Consolas">[Jorge] The non-revertive capability makes sense when there=
 is at least one PE alive in the ES and we don=92t want to preempt it so th=
at there is no traffic impact. If all the PEs fail, there is traffic impact=
 anyway, so there is really no non-revertive behavior, but an initializatio=
n in all the PEs.</span></b><o:p></o:p></pre>
<pre style=3D"margin-left:36.0pt"><b><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">&nbsp;</span></b><o:p></o:p></pre>
<pre style=3D"margin-left:36.0pt"><b><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">[SLI] Let=92s say that you have a CE =
attached to 3 PEs (same ESI). PE1 pref 100, PE2 pref 200, PE3 pref 300. PE1=
 to 3 are configured with DP set. PE4 is a remote PE.</span></b><o:p></o:p>=
</pre>
<pre style=3D"margin-left:36.0pt"><b><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">T0:CE fails and boots up.</span></b><=
o:p></o:p></pre>
<pre style=3D"margin-left:36.0pt"><b><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">T1:PE1 to PE3 starts their HOLD_TIMER=
</span></b><o:p></o:p></pre>
<pre style=3D"margin-left:36.0pt"><b><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">T2: PE1 HOLD_TIMER expires, &nbsp;adv=
ertises ES route and starts DF_TIMER</span></b><o:p></o:p></pre>
<pre style=3D"margin-left:36.0pt"><b><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">T3: PE4 discovers ES from PE1 and sta=
rts DF_TIMER<o:p></o:p></span></b></pre>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.5pt;font-family:Conso=
las;color:red">[jorge2] I assume you mean PE3 here.</span></b><span style=
=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black"><o:p>=
</o:p></span></p>
<pre style=3D"margin-left:36.0pt"><b><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">T4: PE2 HOLD_TIMER expires, &nbsp;adv=
ertises ES route and starts DF_TIMER, does it advertises with Pref100 and D=
P=3D0 as it knows from PE1 route even if PE1 is not DF yet ?<o:p></o:p></sp=
an></b></pre>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.5pt;font-family:Conso=
las;color:red">[jorge2] this is an example in which all PEs are =91initiali=
zing=92 at the same time, so there is traffic impact anyway because the CE =
reboots. So it would be more like an initialization
 example. Nevertheless, PE2 in this case should advertise the ES route with=
 in-use pref 100 and DP=3D0.</span></b><span style=3D"font-size:10.0pt;font=
-family:&quot;Courier New&quot;;color:black"><o:p></o:p></span></p>
<pre style=3D"margin-left:36.0pt"><b><span style=3D"font-size:11.0pt;font-f=
amily:&quot;Calibri&quot;,sans-serif">&nbsp;</span></b><o:p></o:p></pre>
<pre style=3D"margin-left:72.0pt"><span style=3D"color:black">&nbsp;</span>=
<o:p></o:p></pre>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">Brgds,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">Stephane<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">&nbsp;<o:p></o:p></p>
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