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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/pSPcC6SMFvyw48PEA4rsiT8TJLw>
Subject: [Lsr] advertising tunnels in IGP
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<html>
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    Hi,<br>
    In OSPFv2 (and ISIS), we can add (RSVP) tunnels to the topology<br>
    by adding them as a unnumbered link in the router lsa.<br>
    In OSPFv3, we can only add a link to the router-lsa if the neighbor<br>
    interface ID is known. <br>
    So it looks like we can only add a tunnel to the OSPFv3 topology,<br>
    if we first exchanging hello packets over the tunnel. <br>
    Is that correct?<br>
    As this is not needed in the other IGPs, do<br>
    we have other possibilities?<br>
    Thx,<br>
    Dirk<br>
     <br>
    <br>
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Subject: Re: [Lsr] advertising tunnels in IGP
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Hi Dirk,


On 01/03/18 17:05 , Dirk Goethals wrote:
> Hi,
> In OSPFv2 (and ISIS), we can add (RSVP) tunnels to the topology
> by adding them as a unnumbered link in the router lsa.
> In OSPFv3, we can only add a link to the router-lsa if the neighbor
> interface ID is known.
> So it looks like we can only add a tunnel to the OSPFv3 topology,
> if we first exchanging hello packets over the tunnel.
> Is that correct?
> As this is not needed in the other IGPs, do
> we have other possibilities?

well, one can manually configure the local/remote interface IDs to match 
on both sides and advertise as such.

thanks,
Peter
> Thx,
> Dirk
>
>
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>


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To: "lsr@ietf.org" <lsr@ietf.org>, Peter Psenak <ppsenak@cisco.com>
Thread-Topic: [Lsr] advertising tunnels in IGP
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Subject: Re: [Lsr] advertising tunnels in IGP
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Peter,
Indeed.
Thx,
Dirk

Outlook voor Android<https://aka.ms/ghei36> downloaden

________________________________
From: Peter Psenak <ppsenak@cisco.com>
Sent: Thursday, March 1, 2018 5:21:13 PM
To: Goethals, Dirk (Nokia - BE/Antwerp); lsr@ietf.org
Subject: Re: [Lsr] advertising tunnels in IGP

Hi Dirk,


On 01/03/18 17:05 , Dirk Goethals wrote:
> Hi,
> In OSPFv2 (and ISIS), we can add (RSVP) tunnels to the topology
> by adding them as a unnumbered link in the router lsa.
> In OSPFv3, we can only add a link to the router-lsa if the neighbor
> interface ID is known.
> So it looks like we can only add a tunnel to the OSPFv3 topology,
> if we first exchanging hello packets over the tunnel.
> Is that correct?
> As this is not needed in the other IGPs, do
> we have other possibilities?

well, one can manually configure the local/remote interface IDs to match
on both sides and advertise as such.

thanks,
Peter
> Thx,
> Dirk
>
>
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>


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<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family:=
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Peter,<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family:=
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Indeed.<br>
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Thx,<br>
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<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family:=
sans-serif; font-size:11pt; color:black">
Dirk<br>
<br>
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<a href=3D"https://aka.ms/ghei36">Outlook voor Android</a> downloaden</div>
<br>
</div>
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"x_divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" =
color=3D"#000000" style=3D"font-size:11pt"><b>From:</b> Peter Psenak &lt;pp=
senak@cisco.com&gt;<br>
<b>Sent:</b> Thursday, March 1, 2018 5:21:13 PM<br>
<b>To:</b> Goethals, Dirk (Nokia - BE/Antwerp); lsr@ietf.org<br>
<b>Subject:</b> Re: [Lsr] advertising tunnels in IGP</font>
<div>&nbsp;</div>
</div>
</div>
<font size=3D"2"><span style=3D"font-size:11pt;">
<div class=3D"PlainText">Hi Dirk,<br>
<br>
<br>
On 01/03/18 17:05 , Dirk Goethals wrote:<br>
&gt; Hi,<br>
&gt; In OSPFv2 (and ISIS), we can add (RSVP) tunnels to the topology<br>
&gt; by adding them as a unnumbered link in the router lsa.<br>
&gt; In OSPFv3, we can only add a link to the router-lsa if the neighbor<br=
>
&gt; interface ID is known.<br>
&gt; So it looks like we can only add a tunnel to the OSPFv3 topology,<br>
&gt; if we first exchanging hello packets over the tunnel.<br>
&gt; Is that correct?<br>
&gt; As this is not needed in the other IGPs, do<br>
&gt; we have other possibilities?<br>
<br>
well, one can manually configure the local/remote interface IDs to match <b=
r>
on both sides and advertise as such.<br>
<br>
thanks,<br>
Peter<br>
&gt; Thx,<br>
&gt; Dirk<br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt; _______________________________________________<br>
&gt; Lsr mailing list<br>
&gt; Lsr@ietf.org<br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr">https://www.ietf=
.org/mailman/listinfo/lsr</a><br>
&gt;<br>
<br>
</div>
</span></font>
</body>
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To: Dirk Goethals <dirk.goethals@nokia.com>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] advertising tunnels in IGP
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Date: Thu, 1 Mar 2018 16:36:55 +0000
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Subject: Re: [Lsr] advertising tunnels in IGP
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Date: Thu, 1 Mar 2018 19:40:17 +0300
From: Alexander Okonnikov <alexander.okonnikov@gmail.com>
To: Dirk Goethals <dirk.goethals@nokia.com>, "=?utf-8?Q?lsr=40ietf.org?=" <lsr@ietf.org>, "Acee Lindem (acee)" <acee@cisco.com>
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Subject: Re: [Lsr] advertising tunnels in IGP
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Hi,

I think that problem here is that two LSPs are two independent unidirecti=
onal links, rather than one bidirectional. Moreover, LSPs in two directio=
ns are not pairs (some two LSPs are not associated to each other), and am=
ount of LSPs in each direction is not necessary the same. I could assume =
that some router uses Interface IDs for two-way check, but it is not so s=
traightforward when we have deal with =46As.

Acee, two-way check could be disabled on the router that is owner of =46A=
, but how other routers will distinguish regular P2P from =46A=3F
Thank you.

Best regards,
Alexander Okonnikov

1 =D0=BC=D0=B0=D1=80=D1=82=D0=B0 2018 =D0=B3., 19:37 +0300, Acee Lindem (=
acee) <acee=40cisco.com>, =D0=BF=D0=B8=D1=81=D0=B0=D0=BB:
> Hi Dirk,
>
> My memory has faded somewhat on =46orwarding Adjacency (=46A) implement=
ation. However, since basic MPLS LSPs are unidirectional, doesn=E2=80=99t=
 the SP=46 two-way check have to be disabled anyway=3F If so, the Remote =
Interface ID doesn=E2=80=99t matter.
>
> Thanks,
> Acee
>
> =46rom: Lsr <lsr-bounces=40ietf.org> on behalf of =22Goethals, Dirk (No=
kia - BE/Antwerp)=22 <dirk.goethals=40nokia.com>
> Date: Thursday, March 1, 2018 at 11:06 AM
> To: =22lsr=40ietf.org=22 <lsr=40ietf.org>
> Subject: =5BLsr=5D advertising tunnels in IGP
>
> Hi,
> In OSP=46v2 (and ISIS), we can add (RSVP) tunnels to the topology
> by adding them as a unnumbered link in the router lsa.
> In OSP=46v3, we can only add a link to the router-lsa if the neighbor
> interface ID is known.
> So it looks like we can only add a tunnel to the OSP=46v3 topology,
> if we first exchanging hello packets over the tunnel.
> Is that correct=3F
> As this is not needed in the other IGPs, do
> we have other possibilities=3F
> Thx,
> Dirk
>
>
>
> =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F
> Lsr mailing list
> Lsr=40ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

--5a982d06_3352255a_3daa
Content-Type: text/html; charset="utf-8"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

<html xmlns=3D=22http://www.w3.org/1999/xhtml=22>
<head>
<title></title>
</head>
<body>
<div name=3D=22messageBodySection=22>Hi,<br />
<br />
I think that problem here is that two LSPs are two independent unidirecti=
onal links, rather than one bidirectional. Moreover, LSPs in two directio=
ns are not pairs (some two LSPs are not associated to each other), and am=
ount of LSPs in each direction is not necessary the same. I could assume =
that some router uses Interface IDs for two-way check, but it is not so s=
traightforward when we have deal with =46As.<br />
<br />
Acee, two-way check could be disabled on the router that is owner of =46A=
, but how other routers will distinguish regular P2P from =46A=3F<br />
Thank you.</div>
<div name=3D=22messageSignatureSection=22><br />
<div>Best regards,</div>
<div>Alexander Okonnikov<br /></div>
</div>
<div name=3D=22messageReplySection=22><br />
1 =D0=BC=D0=B0=D1=80=D1=82=D0=B0 2018 =D0=B3., 19:37 +0300, Acee Lindem (=
acee) &lt;acee=40cisco.com&gt;, =D0=BF=D0=B8=D1=81=D0=B0=D0=BB:<br />
<blockquote type=3D=22cite=22>
<div class=3D=22WordSection1=22>
<p class=3D=22MsoNormal=22>Hi Dirk,</p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22>My memory has faded somewhat on =46orwarding A=
djacency (=46A) implementation. However, since basic MPLS LSPs are unidir=
ectional, doesn=E2=80=99t the SP=46 two-way check have to be disabled any=
way=3F If so, the Remote Interface ID doesn=E2=80=99t matter.</p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<p class=3D=22MsoNormal=22>Thanks,<br />
Acee</p>
<p class=3D=22MsoNormal=22>&=23160;</p>
<div style=3D=22border:none;border-top:solid =23B5C4D=46 1.0pt;padding:3.=
0pt 0in 0in 0in=22>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22><b><span style=3D=
=22font-size:12.0pt;color:black=22>=46rom:</span></b> <span style=3D=22fo=
nt-size:12.0pt;color:black=22>Lsr &lt;lsr-bounces=40ietf.org&gt; on behal=
f of =22Goethals, Dirk (Nokia - BE/Antwerp)=22 &lt;dirk.goethals=40nokia.=
com&gt;<br />
<b>Date:</b> Thursday, March 1, 2018 at 11:06 AM<br />
<b>To:</b> =22lsr=40ietf.org=22 &lt;lsr=40ietf.org&gt;<br />
<b>Subject:</b> =5BLsr=5D advertising tunnels in IGP</span></p>
</div>
<div>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22>&=23160;</p>
</div>
<p class=3D=22MsoNormal=22 style=3D=22margin-left:.5in=22><a name=3D=22=5F=
MailOriginalBody=22 id=3D=22=5FMailOriginalBody=22>Hi,<br />
In OSP=46v2 (and ISIS), we can add (RSVP) tunnels to the topology<br />
by adding them as a unnumbered link in the router lsa.<br />
In OSP=46v3, we can only add a link to the router-lsa if the neighbor<br =
/>
interface ID is known.<br />
So it looks like we can only add a tunnel to the OSP=46v3 topology,<br />=

if we first exchanging hello packets over the tunnel.<br />
Is that correct=3F<br />
As this is not needed in the other IGPs, do<br />
we have other possibilities=3F<br />
Thx,<br />
Dirk<br />
&=23160;<br />
<br />
<br /></a></p>
</div>
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F<br />
Lsr mailing list<br />
Lsr=40ietf.org<br />
https://www.ietf.org/mailman/listinfo/lsr<br /></blockquote>
</div>
</body>
</html>

--5a982d06_3352255a_3daa--


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Date: Thu, 01 Mar 2018 17:49:31 +0100
From: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [Lsr] advertising tunnels in IGP
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Hi Acee,

On 01/03/18 17:36 , Acee Lindem (acee) wrote:
> Hi Dirk,
>
> My memory has faded somewhat on Forwarding Adjacency (FA)
> implementation. However, since basic MPLS LSPs are unidirectional,
> doesn’t the SPF two-way check have to be disabled anyway? If so, the
> Remote Interface ID doesn’t matter.

no, you have to advertise FA from both sides so that TWC passes.

thanks,
Peter

>
> Thanks,
> Acee
>
> *From: *Lsr <lsr-bounces@ietf.org> on behalf of "Goethals, Dirk (Nokia -
> BE/Antwerp)" <dirk.goethals@nokia.com>
> *Date: *Thursday, March 1, 2018 at 11:06 AM
> *To: *"lsr@ietf.org" <lsr@ietf.org>
> *Subject: *[Lsr] advertising tunnels in IGP
>
> Hi,
> In OSPFv2 (and ISIS), we can add (RSVP) tunnels to the topology
> by adding them as a unnumbered link in the router lsa.
> In OSPFv3, we can only add a link to the router-lsa if the neighbor
> interface ID is known.
> So it looks like we can only add a tunnel to the OSPFv3 topology,
> if we first exchanging hello packets over the tunnel.
> Is that correct?
> As this is not needed in the other IGPs, do
> we have other possibilities?
> Thx,
> Dirk
>
>
>
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, Dirk Goethals <dirk.goethals@nokia.com>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] advertising tunnels in IGP
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Alexander Okonnikov <alexander.okonnikov@gmail.com>, Dirk Goethals <dirk.goethals@nokia.com>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] advertising tunnels in IGP
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Date: Thu, 1 Mar 2018 16:56:46 +0000
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Subject: Re: [Lsr] advertising tunnels in IGP
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To: "Acee Lindem (acee)" <acee@cisco.com>, Dirk Goethals <dirk.goethals@nokia.com>, "lsr@ietf.org" <lsr@ietf.org>
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From: Alexander Okonnikov <alexander.okonnikov@gmail.com>
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Subject: Re: [Lsr] advertising tunnels in IGP
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Hi,

Need for advertising of FA by both sides is dictated by OSPFv2 and 
IS-IS, because they 1) check presence of adjacency in two directions and 
2) cannot distinguish FA from regular P2P link. If latter was possible, 
then it would not be needed to perform two-way check for FA (presence of 
FA just in forward direction means that ingress "link" on remote 
neighbor is working; otherwise LSP in forward direction would be 
broken). It can be generalized to all three protocols: if we can somehow 
identify link type as FA, we don't need two-way check for FA. We also 
don't need Neighbor Interface ID for FA in OSPFv3 in this case.

Thank you.


01.03.2018 19:56, Acee Lindem (acee) пишет:
>
> Hi Alexander,
>
> *From: *Alexander Okonnikov <alexander.okonnikov@gmail.com>
> *Date: *Thursday, March 1, 2018 at 11:40 AM
> *To: *"Goethals, Dirk (Nokia - BE/Antwerp)" <dirk.goethals@nokia.com>, 
> "lsr@ietf.org" <lsr@ietf.org>, Acee Lindem <acee@cisco.com>
> *Subject: *Re: [Lsr] advertising tunnels in IGP
>
> Hi,
>
> I think that problem here is that two LSPs are two independent 
> unidirectional links, rather than one bidirectional. Moreover, LSPs in 
> two directions are not pairs (some two LSPs are not associated to each 
> other), and amount of LSPs in each direction is not necessary the 
> same. I could assume that some router uses Interface IDs for two-way 
> check, but it is not so straightforward when we have deal with FAs.
>
> Acee, two-way check could be disabled on the router that is owner of 
> FA, but how other routers will distinguish regular P2P from FA?
>
> Good point – all the transit routers need to agree on the interface IDs.
>
> Thanks,
>
> Acee
>
>
> Thank you.
>
> Best regards,
>
> Alexander Okonnikov
>
>
> 1 марта 2018 г., 19:37 +0300, Acee Lindem (acee) <acee@cisco.com>, писал:
>
>     Hi Dirk,
>
>     My memory has faded somewhat on Forwarding Adjacency (FA)
>     implementation. However, since basic MPLS LSPs are unidirectional,
>     doesn’t the SPF two-way check have to be disabled anyway? If so,
>     the Remote Interface ID doesn’t matter.
>
>     Thanks,
>     Acee
>
>     *From:* Lsr <lsr-bounces@ietf.org> on behalf of "Goethals, Dirk
>     (Nokia - BE/Antwerp)" <dirk.goethals@nokia.com>
>     *Date:* Thursday, March 1, 2018 at 11:06 AM
>     *To:* "lsr@ietf.org" <lsr@ietf.org>
>     *Subject:* [Lsr] advertising tunnels in IGP
>
>     Hi,
>     In OSPFv2 (and ISIS), we can add (RSVP) tunnels to the topology
>     by adding them as a unnumbered link in the router lsa.
>     In OSPFv3, we can only add a link to the router-lsa if the neighbor
>     interface ID is known.
>     So it looks like we can only add a tunnel to the OSPFv3 topology,
>     if we first exchanging hello packets over the tunnel.
>     Is that correct?
>     As this is not needed in the other IGPs, do
>     we have other possibilities?
>     Thx,
>     Dirk
>
>
>     _______________________________________________
>     Lsr mailing list
>     Lsr@ietf.org
>     https://www.ietf.org/mailman/listinfo/lsr
>


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    <p>Hi,<br>
      <br>
      Need for advertising of FA by both sides is dictated by OSPFv2 and
      IS-IS, because they 1) check presence of adjacency in two
      directions and 2) cannot distinguish FA from regular P2P link. If
      latter was possible, then it would not be needed to perform
      two-way check for FA (presence of FA just in forward direction
      means that ingress "link" on remote neighbor is working; otherwise
      LSP in forward direction would be broken). It can be generalized
      to all three protocols: if we can somehow identify link type as
      FA, we don't need two-way check for FA. We also don't need
      Neighbor Interface ID for FA in OSPFv3 in this case.<br>
      <br>
      Thank you.<br>
    </p>
    <br>
    <div class="moz-cite-prefix">01.03.2018 19:56, Acee Lindem (acee)
      пишет:<br>
    </div>
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      cite="mid:8D23AE85-3408-457E-A1CC-4B78157A11BE@cisco.com">
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        <p class="MsoNormal">Hi Alexander, <o:p></o:p></p>
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        <div style="border:none;border-top:solid #B5C4DF
          1.0pt;padding:3.0pt 0in 0in 0in">
          <p class="MsoNormal" style="margin-left:.5in"><b><span
                style="font-size:12.0pt;color:black">From:
              </span></b><span style="font-size:12.0pt;color:black">Alexander
              Okonnikov <a class="moz-txt-link-rfc2396E" href="mailto:alexander.okonnikov@gmail.com">&lt;alexander.okonnikov@gmail.com&gt;</a><br>
              <b>Date: </b>Thursday, March 1, 2018 at 11:40 AM<br>
              <b>To: </b>"Goethals, Dirk (Nokia - BE/Antwerp)"
              <a class="moz-txt-link-rfc2396E" href="mailto:dirk.goethals@nokia.com">&lt;dirk.goethals@nokia.com&gt;</a>, <a class="moz-txt-link-rfc2396E" href="mailto:lsr@ietf.org">"lsr@ietf.org"</a>
              <a class="moz-txt-link-rfc2396E" href="mailto:lsr@ietf.org">&lt;lsr@ietf.org&gt;</a>, Acee Lindem <a class="moz-txt-link-rfc2396E" href="mailto:acee@cisco.com">&lt;acee@cisco.com&gt;</a><br>
              <b>Subject: </b>Re: [Lsr] advertising tunnels in IGP<o:p></o:p></span></p>
        </div>
        <div>
          <p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
        </div>
        <div name="messageBodySection">
          <p class="MsoNormal" style="margin-left:.5in">Hi,<br>
            <br>
            I think that problem here is that two LSPs are two
            independent unidirectional links, rather than one
            bidirectional. Moreover, LSPs in two directions are not
            pairs (some two LSPs are not associated to each other), and
            amount of LSPs in each direction is not necessary the same.
            I could assume that some router uses Interface IDs for
            two-way check, but it is not so straightforward when we have
            deal with FAs.<br>
            <br>
            Acee, two-way check could be disabled on the router that is
            owner of FA, but how other routers will distinguish regular
            P2P from FA?<o:p></o:p></p>
          <p class="MsoNormal"><o:p> </o:p></p>
          <p class="MsoNormal">Good point – all the transit routers need
            to agree on the interface IDs.
            <o:p></o:p></p>
          <p class="MsoNormal"><o:p> </o:p></p>
          <p class="MsoNormal">Thanks,<o:p></o:p></p>
          <p class="MsoNormal">Acee <o:p></o:p></p>
          <p class="MsoNormal"><o:p> </o:p></p>
          <p class="MsoNormal" style="margin-left:.5in"><br>
            Thank you.<o:p></o:p></p>
        </div>
        <div name="messageSignatureSection">
          <p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
          <div>
            <p class="MsoNormal" style="margin-left:.5in">Best regards,<o:p></o:p></p>
          </div>
          <div>
            <p class="MsoNormal" style="margin-left:.5in">Alexander
              Okonnikov<o:p></o:p></p>
          </div>
        </div>
        <div name="messageReplySection">
          <p class="MsoNormal" style="margin-left:.5in"><br>
            1 марта 2018 г., 19:37 +0300, Acee Lindem (acee)
            <a class="moz-txt-link-rfc2396E" href="mailto:acee@cisco.com">&lt;acee@cisco.com&gt;</a>, писал:<br>
            <br>
            <o:p></o:p></p>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">Hi
                Dirk,<o:p></o:p></p>
              <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in"> <o:p></o:p></p>
              <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">My
                memory has faded somewhat on Forwarding Adjacency (FA)
                implementation. However, since basic MPLS LSPs are
                unidirectional, doesn’t the SPF two-way check have to be
                disabled anyway? If so, the Remote Interface ID doesn’t
                matter.<o:p></o:p></p>
              <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in"> <o:p></o:p></p>
              <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">Thanks,<br>
                Acee<o:p></o:p></p>
              <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in"> <o:p></o:p></p>
              <div style="border:none;border-top:solid #B5C4DF
                1.0pt;padding:3.0pt 0in 0in 0in">
                <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in"><b><span
                      style="font-size:12.0pt;color:black">From:</span></b>
                  <span style="font-size:12.0pt;color:black">
                    Lsr <a class="moz-txt-link-rfc2396E" href="mailto:lsr-bounces@ietf.org">&lt;lsr-bounces@ietf.org&gt;</a> on behalf of
                    "Goethals, Dirk (Nokia - BE/Antwerp)"
                    <a class="moz-txt-link-rfc2396E" href="mailto:dirk.goethals@nokia.com">&lt;dirk.goethals@nokia.com&gt;</a><br>
                    <b>Date:</b> Thursday, March 1, 2018 at 11:06 AM<br>
                    <b>To:</b> <a class="moz-txt-link-rfc2396E" href="mailto:lsr@ietf.org">"lsr@ietf.org"</a> <a class="moz-txt-link-rfc2396E" href="mailto:lsr@ietf.org">&lt;lsr@ietf.org&gt;</a><br>
                    <b>Subject:</b> [Lsr] advertising tunnels in IGP</span><o:p></o:p></p>
              </div>
              <div>
                <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in"> <o:p></o:p></p>
              </div>
              <p class="MsoNormal"
                style="mso-margin-top-alt:auto;margin-bottom:12.0pt;margin-left:1.0in">
                <a name="_MailOriginalBody" moz-do-not-send="true">Hi,<br>
                  In OSPFv2 (and ISIS), we can add (RSVP) tunnels to the
                  topology<br>
                  by adding them as a unnumbered link in the router lsa.<br>
                  In OSPFv3, we can only add a link to the router-lsa if
                  the neighbor<br>
                  interface ID is known.<br>
                  So it looks like we can only add a tunnel to the
                  OSPFv3 topology,<br>
                  if we first exchanging hello packets over the tunnel.<br>
                  Is that correct?<br>
                  As this is not needed in the other IGPs, do<br>
                  we have other possibilities?<br>
                  Thx,<br>
                  Dirk<br>
                   <br>
                  <br>
                  <o:p></o:p></a></p>
            </div>
            <p class="MsoNormal" style="margin-left:.5in"><span
                style="mso-bookmark:_MailOriginalBody">_______________________________________________<br>
                Lsr mailing list<br>
                <a class="moz-txt-link-abbreviated" href="mailto:Lsr@ietf.org">Lsr@ietf.org</a><br>
                <a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/lsr">https://www.ietf.org/mailman/listinfo/lsr</a><o:p></o:p></span></p>
          </blockquote>
        </div>
      </div>
    </blockquote>
    <br>
  </body>
</html>

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From: Alexander Okonnikov <alexander.okonnikov@gmail.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, Dirk Goethals <dirk.goethals@nokia.com>, "lsr@ietf.org" <lsr@ietf.org>
References: <292c4d7f-157b-6920-917a-5157fb2890aa@nokia.com> <2D3557F2-53EA-4C4B-9B00-474C5FF4EBAF@cisco.com> <26b261b4-00b1-4e01-ab4c-ede98883b155@Spark> <8D23AE85-3408-457E-A1CC-4B78157A11BE@cisco.com> <b9f19b6e-2771-9ab9-383e-ffacb788e010@gmail.com>
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Subject: Re: [Lsr] advertising tunnels in IGP
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Hi,

I cannot find in RFC 5340 where pair of Interface ID/Neighbor Interface 
ID are used for two-way check for P2P link. RFC 5340 reuses SPF 
algorithm from RFC 2328. RFC 2328 says that W should have link back to 
V, but it also says (in footnote 23) that link from W to V does not 
necessarily matches to link from V to W. I.e. presence of two 
unidirectional links is enough for two-way check to be passed. Is it 
correct?

If yes then, what if OSPFv3 router will set Neighbor Interface ID to 0 
for P2P link and the neighbor will do the same? How it will be treated 
by other routers while calculate SPF?

Also, Neighbor Interface ID is used as reference for corresponding Link 
LSA while calculating next-hop. Per my understanding neighbor's IPv6 
link-local address is not needed (as well as neighbor's Link LSA), 
because LSP will be next-hop in this case.

Thanks.


01.03.2018 20:08, Alexander Okonnikov пишет:
>
> Hi,
>
> Need for advertising of FA by both sides is dictated by OSPFv2 and 
> IS-IS, because they 1) check presence of adjacency in two directions 
> and 2) cannot distinguish FA from regular P2P link. If latter was 
> possible, then it would not be needed to perform two-way check for FA 
> (presence of FA just in forward direction means that ingress "link" on 
> remote neighbor is working; otherwise LSP in forward direction would 
> be broken). It can be generalized to all three protocols: if we can 
> somehow identify link type as FA, we don't need two-way check for FA. 
> We also don't need Neighbor Interface ID for FA in OSPFv3 in this case.
>
> Thank you.
>
>
> 01.03.2018 19:56, Acee Lindem (acee) пишет:
>>
>> Hi Alexander,
>>
>> *From: *Alexander Okonnikov <alexander.okonnikov@gmail.com>
>> *Date: *Thursday, March 1, 2018 at 11:40 AM
>> *To: *"Goethals, Dirk (Nokia - BE/Antwerp)" 
>> <dirk.goethals@nokia.com>, "lsr@ietf.org" <lsr@ietf.org>, Acee Lindem 
>> <acee@cisco.com>
>> *Subject: *Re: [Lsr] advertising tunnels in IGP
>>
>> Hi,
>>
>> I think that problem here is that two LSPs are two independent 
>> unidirectional links, rather than one bidirectional. Moreover, LSPs 
>> in two directions are not pairs (some two LSPs are not associated to 
>> each other), and amount of LSPs in each direction is not necessary 
>> the same. I could assume that some router uses Interface IDs for 
>> two-way check, but it is not so straightforward when we have deal 
>> with FAs.
>>
>> Acee, two-way check could be disabled on the router that is owner of 
>> FA, but how other routers will distinguish regular P2P from FA?
>>
>> Good point – all the transit routers need to agree on the interface IDs.
>>
>> Thanks,
>>
>> Acee
>>
>>
>> Thank you.
>>
>> Best regards,
>>
>> Alexander Okonnikov
>>
>>
>> 1 марта 2018 г., 19:37 +0300, Acee Lindem (acee) <acee@cisco.com>, писал:
>>
>>     Hi Dirk,
>>
>>     My memory has faded somewhat on Forwarding Adjacency (FA)
>>     implementation. However, since basic MPLS LSPs are
>>     unidirectional, doesn’t the SPF two-way check have to be disabled
>>     anyway? If so, the Remote Interface ID doesn’t matter.
>>
>>     Thanks,
>>     Acee
>>
>>     *From:* Lsr <lsr-bounces@ietf.org> on behalf of "Goethals, Dirk
>>     (Nokia - BE/Antwerp)" <dirk.goethals@nokia.com>
>>     *Date:* Thursday, March 1, 2018 at 11:06 AM
>>     *To:* "lsr@ietf.org" <lsr@ietf.org>
>>     *Subject:* [Lsr] advertising tunnels in IGP
>>
>>     Hi,
>>     In OSPFv2 (and ISIS), we can add (RSVP) tunnels to the topology
>>     by adding them as a unnumbered link in the router lsa.
>>     In OSPFv3, we can only add a link to the router-lsa if the neighbor
>>     interface ID is known.
>>     So it looks like we can only add a tunnel to the OSPFv3 topology,
>>     if we first exchanging hello packets over the tunnel.
>>     Is that correct?
>>     As this is not needed in the other IGPs, do
>>     we have other possibilities?
>>     Thx,
>>     Dirk
>>
>>
>>     _______________________________________________
>>     Lsr mailing list
>>     Lsr@ietf.org
>>     https://www.ietf.org/mailman/listinfo/lsr
>>
>


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    <p>Hi,<br>
      <br>
      I cannot find in RFC 5340 where pair of Interface ID/Neighbor
      Interface ID are used for two-way check for P2P link. RFC 5340
      reuses SPF algorithm from RFC 2328. RFC 2328 says that W should
      have link back to V, but it also says (in footnote 23) that link
      from W to V does not necessarily matches to link from V to W. I.e.
      presence of two unidirectional links is enough for two-way check
      to be passed. Is it correct?<br>
      <br>
      If yes then, what if OSPFv3 router will set Neighbor Interface ID
      to 0 for P2P link and the neighbor will do the same? How it will
      be treated by other routers while calculate SPF?<br>
      <br>
      Also, Neighbor Interface ID is used as reference for corresponding
      Link LSA while calculating next-hop. Per my understanding
      neighbor's IPv6 link-local address is not needed (as well as
      neighbor's Link LSA), because LSP will be next-hop in this case.<br>
      <br>
      Thanks.<br>
    </p>
    <br>
    <div class="moz-cite-prefix">01.03.2018 20:08, Alexander Okonnikov
      пишет:<br>
    </div>
    <blockquote type="cite"
      cite="mid:b9f19b6e-2771-9ab9-383e-ffacb788e010@gmail.com">
      <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
      <p>Hi,<br>
        <br>
        Need for advertising of FA by both sides is dictated by OSPFv2
        and IS-IS, because they 1) check presence of adjacency in two
        directions and 2) cannot distinguish FA from regular P2P link.
        If latter was possible, then it would not be needed to perform
        two-way check for FA (presence of FA just in forward direction
        means that ingress "link" on remote neighbor is working;
        otherwise LSP in forward direction would be broken). It can be
        generalized to all three protocols: if we can somehow identify
        link type as FA, we don't need two-way check for FA. We also
        don't need Neighbor Interface ID for FA in OSPFv3 in this case.<br>
        <br>
        Thank you.<br>
      </p>
      <br>
      <div class="moz-cite-prefix">01.03.2018 19:56, Acee Lindem (acee)
        пишет:<br>
      </div>
      <blockquote type="cite"
        cite="mid:8D23AE85-3408-457E-A1CC-4B78157A11BE@cisco.com">
        <meta http-equiv="Content-Type" content="text/html;
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        <div class="WordSection1">
          <p class="MsoNormal">Hi Alexander, <o:p></o:p></p>
          <p class="MsoNormal"><o:p> </o:p></p>
          <div style="border:none;border-top:solid #B5C4DF
            1.0pt;padding:3.0pt 0in 0in 0in">
            <p class="MsoNormal" style="margin-left:.5in"><b><span
                  style="font-size:12.0pt;color:black">From: </span></b><span
                style="font-size:12.0pt;color:black">Alexander Okonnikov
                <a class="moz-txt-link-rfc2396E"
                  href="mailto:alexander.okonnikov@gmail.com"
                  moz-do-not-send="true">&lt;alexander.okonnikov@gmail.com&gt;</a><br>
                <b>Date: </b>Thursday, March 1, 2018 at 11:40 AM<br>
                <b>To: </b>"Goethals, Dirk (Nokia - BE/Antwerp)" <a
                  class="moz-txt-link-rfc2396E"
                  href="mailto:dirk.goethals@nokia.com"
                  moz-do-not-send="true">&lt;dirk.goethals@nokia.com&gt;</a>,
                <a class="moz-txt-link-rfc2396E"
                  href="mailto:lsr@ietf.org" moz-do-not-send="true">"lsr@ietf.org"</a>
                <a class="moz-txt-link-rfc2396E"
                  href="mailto:lsr@ietf.org" moz-do-not-send="true">&lt;lsr@ietf.org&gt;</a>,
                Acee Lindem <a class="moz-txt-link-rfc2396E"
                  href="mailto:acee@cisco.com" moz-do-not-send="true">&lt;acee@cisco.com&gt;</a><br>
                <b>Subject: </b>Re: [Lsr] advertising tunnels in IGP<o:p></o:p></span></p>
          </div>
          <div>
            <p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
          </div>
          <div name="messageBodySection">
            <p class="MsoNormal" style="margin-left:.5in">Hi,<br>
              <br>
              I think that problem here is that two LSPs are two
              independent unidirectional links, rather than one
              bidirectional. Moreover, LSPs in two directions are not
              pairs (some two LSPs are not associated to each other),
              and amount of LSPs in each direction is not necessary the
              same. I could assume that some router uses Interface IDs
              for two-way check, but it is not so straightforward when
              we have deal with FAs.<br>
              <br>
              Acee, two-way check could be disabled on the router that
              is owner of FA, but how other routers will distinguish
              regular P2P from FA?<o:p></o:p></p>
            <p class="MsoNormal"><o:p> </o:p></p>
            <p class="MsoNormal">Good point – all the transit routers
              need to agree on the interface IDs. <o:p></o:p></p>
            <p class="MsoNormal"><o:p> </o:p></p>
            <p class="MsoNormal">Thanks,<o:p></o:p></p>
            <p class="MsoNormal">Acee <o:p></o:p></p>
            <p class="MsoNormal"><o:p> </o:p></p>
            <p class="MsoNormal" style="margin-left:.5in"><br>
              Thank you.<o:p></o:p></p>
          </div>
          <div name="messageSignatureSection">
            <p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
            <div>
              <p class="MsoNormal" style="margin-left:.5in">Best
                regards,<o:p></o:p></p>
            </div>
            <div>
              <p class="MsoNormal" style="margin-left:.5in">Alexander
                Okonnikov<o:p></o:p></p>
            </div>
          </div>
          <div name="messageReplySection">
            <p class="MsoNormal" style="margin-left:.5in"><br>
              1 марта 2018 г., 19:37 +0300, Acee Lindem (acee) <a
                class="moz-txt-link-rfc2396E"
                href="mailto:acee@cisco.com" moz-do-not-send="true">&lt;acee@cisco.com&gt;</a>,
              писал:<br>
              <br>
              <o:p></o:p></p>
            <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
              <div>
                <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">Hi
                  Dirk,<o:p></o:p></p>
                <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in"> <o:p></o:p></p>
                <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">My
                  memory has faded somewhat on Forwarding Adjacency (FA)
                  implementation. However, since basic MPLS LSPs are
                  unidirectional, doesn’t the SPF two-way check have to
                  be disabled anyway? If so, the Remote Interface ID
                  doesn’t matter.<o:p></o:p></p>
                <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in"> <o:p></o:p></p>
                <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in">Thanks,<br>
                  Acee<o:p></o:p></p>
                <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:.5in"> <o:p></o:p></p>
                <div style="border:none;border-top:solid #B5C4DF
                  1.0pt;padding:3.0pt 0in 0in 0in">
                  <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in"><b><span
                        style="font-size:12.0pt;color:black">From:</span></b>
                    <span style="font-size:12.0pt;color:black"> Lsr <a
                        class="moz-txt-link-rfc2396E"
                        href="mailto:lsr-bounces@ietf.org"
                        moz-do-not-send="true">&lt;lsr-bounces@ietf.org&gt;</a>
                      on behalf of "Goethals, Dirk (Nokia - BE/Antwerp)"
                      <a class="moz-txt-link-rfc2396E"
                        href="mailto:dirk.goethals@nokia.com"
                        moz-do-not-send="true">&lt;dirk.goethals@nokia.com&gt;</a><br>
                      <b>Date:</b> Thursday, March 1, 2018 at 11:06 AM<br>
                      <b>To:</b> <a class="moz-txt-link-rfc2396E"
                        href="mailto:lsr@ietf.org"
                        moz-do-not-send="true">"lsr@ietf.org"</a> <a
                        class="moz-txt-link-rfc2396E"
                        href="mailto:lsr@ietf.org"
                        moz-do-not-send="true">&lt;lsr@ietf.org&gt;</a><br>
                      <b>Subject:</b> [Lsr] advertising tunnels in IGP</span><o:p></o:p></p>
                </div>
                <div>
                  <p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in"> <o:p></o:p></p>
                </div>
                <p class="MsoNormal"
                  style="mso-margin-top-alt:auto;margin-bottom:12.0pt;margin-left:1.0in">
                  <a name="_MailOriginalBody" moz-do-not-send="true">Hi,<br>
                    In OSPFv2 (and ISIS), we can add (RSVP) tunnels to
                    the topology<br>
                    by adding them as a unnumbered link in the router
                    lsa.<br>
                    In OSPFv3, we can only add a link to the router-lsa
                    if the neighbor<br>
                    interface ID is known.<br>
                    So it looks like we can only add a tunnel to the
                    OSPFv3 topology,<br>
                    if we first exchanging hello packets over the
                    tunnel.<br>
                    Is that correct?<br>
                    As this is not needed in the other IGPs, do<br>
                    we have other possibilities?<br>
                    Thx,<br>
                    Dirk<br>
                     <br>
                    <br>
                    <o:p></o:p></a></p>
              </div>
              <p class="MsoNormal" style="margin-left:.5in"><span
                  style="mso-bookmark:_MailOriginalBody">_______________________________________________<br>
                  Lsr mailing list<br>
                  <a class="moz-txt-link-abbreviated"
                    href="mailto:Lsr@ietf.org" moz-do-not-send="true">Lsr@ietf.org</a><br>
                  <a class="moz-txt-link-freetext"
                    href="https://www.ietf.org/mailman/listinfo/lsr"
                    moz-do-not-send="true">https://www.ietf.org/mailman/listinfo/lsr</a><o:p></o:p></span></p>
            </blockquote>
          </div>
        </div>
      </blockquote>
      <br>
    </blockquote>
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From: "Goethals, Dirk (Nokia - BE/Antwerp)" <dirk.goethals@nokia.com>
To: Alexander Okonnikov <alexander.okonnikov@gmail.com>, "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] advertising tunnels in IGP
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Date: Thu, 1 Mar 2018 20:06:11 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/hdN6b69GikSxlYeRyCyVTG4fVJc>
Subject: Re: [Lsr] advertising tunnels in IGP
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Hi Alexander, Acee, Peter,
Thanks for your prompt suggestions.

Alexander,
I=92m also in favor of having something as simple as in OSPFV2.
So, I=92m somewere on the same track as you, i.e.
1) a flexible bidirectional check when nbrid=3D0, similar as unnumbered p2p=
 in OSPFv2
2) during next hop resolution, when nbrid=3D0, pick up the local tunnelinfo=
 iso neigbors
ip address.

Thanks,
Dirk

_____________________________
From: Alexander Okonnikov <alexander.okonnikov@gmail.com>
Sent: donderdag, maart 1, 2018 6:54 PM
Subject: Re: [Lsr] advertising tunnels in IGP
To: Acee Lindem (acee) <acee@cisco.com>, Goethals, Dirk (Nokia - BE/Antwerp=
) <dirk.goethals@nokia.com>, <lsr@ietf.org>



Hi,

I cannot find in RFC 5340 where pair of Interface ID/Neighbor Interface ID =
are used for two-way check for P2P link. RFC 5340 reuses SPF algorithm from=
 RFC 2328. RFC 2328 says that W should have link back to V, but it also say=
s (in footnote 23) that link from W to V does not necessarily matches to li=
nk from V to W. I.e. presence of two unidirectional links is enough for two=
-way check to be passed. Is it correct?

If yes then, what if OSPFv3 router will set Neighbor Interface ID to 0 for =
P2P link and the neighbor will do the same? How it will be treated by other=
 routers while calculate SPF?

Also, Neighbor Interface ID is used as reference for corresponding Link LSA=
 while calculating next-hop. Per my understanding neighbor's IPv6 link-loca=
l address is not needed (as well as neighbor's Link LSA), because LSP will =
be next-hop in this case.

Thanks.

01.03.2018 20:08, Alexander Okonnikov =EF=E8=F8=E5=F2:

Hi,

Need for advertising of FA by both sides is dictated by OSPFv2 and IS-IS, b=
ecause they 1) check presence of adjacency in two directions and 2) cannot =
distinguish FA from regular P2P link. If latter was possible, then it would=
 not be needed to perform two-way check for FA (presence of FA just in forw=
ard direction means that ingress "link" on remote neighbor is working; othe=
rwise LSP in forward direction would be broken). It can be generalized to a=
ll three protocols: if we can somehow identify link type as FA, we don't ne=
ed two-way check for FA. We also don't need Neighbor Interface ID for FA in=
 OSPFv3 in this case.

Thank you.

01.03.2018 19:56, Acee Lindem (acee) =EF=E8=F8=E5=F2:
Hi Alexander,

From:Alexander Okonnikov <alexander.okonnikov@gmail.com><mailto:alexander.o=
konnikov@gmail.com>
Date: Thursday, March 1, 2018 at 11:40 AM
To: "Goethals, Dirk (Nokia - BE/Antwerp)" <dirk.goethals@nokia.com><mailto:=
dirk.goethals@nokia.com>, "lsr@ietf.org"<mailto:lsr@ietf.org> <lsr@ietf.org=
><mailto:lsr@ietf.org>, Acee Lindem<acee@cisco.com><mailto:acee@cisco.com>
Subject: Re: [Lsr] advertising tunnels in IGP

Hi,

I think that problem here is that two LSPs are two independent unidirection=
al links, rather than one bidirectional. Moreover, LSPs in two directions a=
re not pairs (some two LSPs are not associated to each other), and amount o=
f LSPs in each direction is not necessary the same. I could assume that som=
e router uses Interface IDs for two-way check, but it is not so straightfor=
ward when we have deal with FAs.

Acee, two-way check could be disabled on the router that is owner of FA, bu=
t how other routers will distinguish regular P2P from FA?

Good point =96 all the transit routers need to agree on the interface IDs.

Thanks,
Acee


Thank you.

Best regards,
Alexander Okonnikov

1 =EC=E0=F0=F2=E0 2018 =E3., 19:37 +0300, Acee Lindem (acee) <acee@cisco.co=
m><mailto:acee@cisco.com>, =EF=E8=F1=E0=EB:

Hi Dirk,

My memory has faded somewhat on Forwarding Adjacency (FA) implementation. H=
owever, since basic MPLS LSPs are unidirectional, doesn=92t the SPF two-way=
 check have to be disabled anyway? If so, the Remote Interface ID doesn=92t=
 matter.

Thanks,
Acee

From:Lsr <lsr-bounces@ietf.org><mailto:lsr-bounces@ietf.org> on behalf of "=
Goethals, Dirk (Nokia - BE/Antwerp)" <dirk.goethals@nokia.com><mailto:dirk.=
goethals@nokia.com>
Date: Thursday, March 1, 2018 at 11:06 AM
To: "lsr@ietf.org"<mailto:lsr@ietf.org><lsr@ietf.org><mailto:lsr@ietf.org>
Subject: [Lsr] advertising tunnels in IGP

Hi,
In OSPFv2 (and ISIS), we can add (RSVP) tunnels to the topology
by adding them as a unnumbered link in the router lsa.
In OSPFv3, we can only add a link to the router-lsa if the neighbor
interface ID is known.
So it looks like we can only add a tunnel to the OSPFv3 topology,
if we first exchanging hello packets over the tunnel.
Is that correct?
As this is not needed in the other IGPs, do
we have other possibilities?
Thx,
Dirk


_______________________________________________
Lsr mailing list
Lsr@ietf.org<mailto:Lsr@ietf.org>
https://www.ietf.org/mailman/listinfo/lsr





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ganization"><span itemprop=3D"name" content=3D"Outlook Mobile for iOS"></sp=
an></span>
<div>
<div style=3D"direction: ltr;">Hi Alexander, Acee, Peter,</div>
<div style=3D"direction: ltr;">Thanks for your prompt suggestions.</div>
<div><br>
</div>
<div style=3D"direction: ltr;">Alexander,</div>
<div style=3D"direction: ltr;">I=92m also in favor of having something as s=
imple as in OSPFV2.&nbsp;</div>
<div style=3D"direction: ltr;">So, I=92m somewere on the same track as you,=
 i.e.</div>
<div style=3D"direction: ltr;">1) a flexible bidirectional check when nbrid=
=3D0, similar as unnumbered p2p in OSPFv2</div>
<div style=3D"direction: ltr;">2) during next hop resolution, when nbrid=3D=
0, pick up the local tunnelinfo iso neigbors</div>
<div style=3D"direction: ltr;">ip address.</div>
<div><br>
</div>
<div style=3D"direction: ltr;">Thanks,</div>
<div style=3D"direction: ltr;">Dirk</div>
<div><br>
</div>
<div class=3D"acompli_signature"></div>
<div class=3D"gmail_quote">_____________________________<br>
From: Alexander Okonnikov &lt;alexander.okonnikov@gmail.com&gt;<br>
Sent: donderdag, maart 1, 2018 6:54 PM<br>
Subject: Re: [Lsr] advertising tunnels in IGP<br>
To: Acee Lindem (acee) &lt;acee@cisco.com&gt;, Goethals, Dirk (Nokia - BE/A=
ntwerp) &lt;dirk.goethals@nokia.com&gt;, &lt;lsr@ietf.org&gt;<br>
<br>
<br>
<meta content=3D"text/html; charset=3Dutf-8">
<p>Hi,<br>
<br>
I cannot find in RFC 5340 where pair of Interface ID/Neighbor Interface ID =
are used for two-way check for P2P link. RFC 5340 reuses SPF algorithm from=
 RFC 2328. RFC 2328 says that W should have link back to V, but it also say=
s (in footnote 23) that link from
 W to V does not necessarily matches to link from V to W. I.e. presence of =
two unidirectional links is enough for two-way check to be passed. Is it co=
rrect?<br>
<br>
If yes then, what if OSPFv3 router will set Neighbor Interface ID to 0 for =
P2P link and the neighbor will do the same? How it will be treated by other=
 routers while calculate SPF?<br>
<br>
Also, Neighbor Interface ID is used as reference for corresponding Link LSA=
 while calculating next-hop. Per my understanding neighbor's IPv6 link-loca=
l address is not needed (as well as neighbor's Link LSA), because LSP will =
be next-hop in this case.<br>
<br>
Thanks.<br>
</p>
<br>
<div class=3D"moz-cite-prefix">01.03.2018 20:08, Alexander Okonnikov =EF=E8=
=F8=E5=F2:<br>
</div>
<blockquote type=3D"cite">
<p>Hi,<br>
<br>
Need for advertising of FA by both sides is dictated by OSPFv2 and IS-IS, b=
ecause they 1) check presence of adjacency in two directions and 2) cannot =
distinguish FA from regular P2P link. If latter was possible, then it would=
 not be needed to perform two-way
 check for FA (presence of FA just in forward direction means that ingress =
&quot;link&quot; on remote neighbor is working; otherwise LSP in forward di=
rection would be broken). It can be generalized to all three protocols: if =
we can somehow identify link type as FA, we
 don't need two-way check for FA. We also don't need Neighbor Interface ID =
for FA in OSPFv3 in this case.<br>
<br>
Thank you.<br>
</p>
<br>
<div class=3D"moz-cite-prefix">01.03.2018 19:56, Acee Lindem (acee) =EF=E8=
=F8=E5=F2:<br>
</div>
<blockquote type=3D"cite">
<meta name=3D"Generator" content=3D"Microsoft Word 15 (filtered          me=
dium)">
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dSection1	{margin:1.0in 1.0in 1.0in 1.0in}div.WordSection1	{}--></style>
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi Alexander, </p>
<p class=3D"MsoNormal">&nbsp;</p>
<div style=3D"border:none; border-top:solid #B5C4DF            1.0pt; paddi=
ng:3.0pt 0in 0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span style=3D"font-si=
ze:12.0pt; color:black">From:</span></b><span style=3D"font-size:12.0pt; co=
lor:black">Alexander Okonnikov
<a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:alexander.okonnikov@gmail=
.com">&lt;alexander.okonnikov@gmail.com&gt;</a><br>
<b>Date: </b>Thursday, March 1, 2018 at 11:40 AM<br>
<b>To: </b>&quot;Goethals, Dirk (Nokia - BE/Antwerp)&quot; <a class=3D"moz-=
txt-link-rfc2396E" href=3D"mailto:dirk.goethals@nokia.com">
&lt;dirk.goethals@nokia.com&gt;</a>, <a class=3D"moz-txt-link-rfc2396E" hre=
f=3D"mailto:lsr@ietf.org">
&quot;lsr@ietf.org&quot;</a> <a class=3D"moz-txt-link-rfc2396E" href=3D"mai=
lto:lsr@ietf.org">&lt;lsr@ietf.org&gt;</a>, Acee Lindem<a class=3D"moz-txt-=
link-rfc2396E" href=3D"mailto:acee@cisco.com">&lt;acee@cisco.com&gt;</a><br=
>
<b>Subject: </b>Re: [Lsr] advertising tunnels in IGP</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;</p>
</div>
<div name=3D"messageBodySection">
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Hi,<br>
<br>
I think that problem here is that two LSPs are two independent unidirection=
al links, rather than one bidirectional. Moreover, LSPs in two directions a=
re not pairs (some two LSPs are not associated to each other), and amount o=
f LSPs in each direction is not
 necessary the same. I could assume that some router uses Interface IDs for=
 two-way check, but it is not so straightforward when we have deal with FAs=
.<br>
<br>
Acee, two-way check could be disabled on the router that is owner of FA, bu=
t how other routers will distinguish regular P2P from FA?</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Good point =96 all the transit routers need to agree=
 on the interface IDs.</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Thanks,</p>
<p class=3D"MsoNormal">Acee </p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><br>
Thank you.</p>
</div>
<div name=3D"messageSignatureSection">
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;</p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Best regards,</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Alexander Okonnikov</p>
</div>
</div>
<div name=3D"messageReplySection">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><br>
1 =EC=E0=F0=F2=E0 2018 =E3., 19:37 &#43;0300, Acee Lindem (acee) <a class=
=3D"moz-txt-link-rfc2396E" href=3D"mailto:acee@cisco.com">
&lt;acee@cisco.com&gt;</a>, =EF=E8=F1=E0=EB:<br>
<br>
</p>
<blockquote style=3D"margin-top:5.0pt; margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Hi Dirk,</p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;</p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">My memory has faded somew=
hat on Forwarding Adjacency (FA) implementation. However, since basic MPLS =
LSPs are unidirectional, doesn=92t the SPF two-way check have to be disable=
d anyway? If so, the Remote Interface
 ID doesn=92t matter.</p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;</p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Thanks,<br>
Acee</p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;</p>
<div style=3D"border:none; border-top:solid #B5C4DF                  1.0pt;=
 padding:3.0pt 0in 0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:1.0in"><b><span style=3D"font-s=
ize:12.0pt; color:black">From:</span></b><span style=3D"font-size:12.0pt; c=
olor:black">Lsr
<a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:lsr-bounces@ietf.org">&lt=
;lsr-bounces@ietf.org&gt;</a> on behalf of &quot;Goethals, Dirk (Nokia - BE=
/Antwerp)&quot;
<a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:dirk.goethals@nokia.com">=
&lt;dirk.goethals@nokia.com&gt;</a><br>
<b>Date:</b> Thursday, March 1, 2018 at 11:06 AM<br>
<b>To:</b> <a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:lsr@ietf.org">=
&quot;lsr@ietf.org&quot;</a><a class=3D"moz-txt-link-rfc2396E" href=3D"mail=
to:lsr@ietf.org">&lt;lsr@ietf.org&gt;</a><br>
<b>Subject:</b> [Lsr] advertising tunnels in IGP</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;</p>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt; margin-left:1.0in"><a=
 name=3D"_MailOriginalBody">Hi,<br>
In OSPFv2 (and ISIS), we can add (RSVP) tunnels to the topology<br>
by adding them as a unnumbered link in the router lsa.<br>
In OSPFv3, we can only add a link to the router-lsa if the neighbor<br>
interface ID is known.<br>
So it looks like we can only add a tunnel to the OSPFv3 topology,<br>
if we first exchanging hello packets over the tunnel.<br>
Is that correct?<br>
As this is not needed in the other IGPs, do<br>
we have other possibilities?<br>
Thx,<br>
Dirk<br>
&nbsp;<br>
<br>
</a></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"">________=
_______________________________________<br>
Lsr mailing list<br>
<a class=3D"moz-txt-link-abbreviated" href=3D"mailto:Lsr@ietf.org">Lsr@ietf=
.org</a><br>
<a class=3D"moz-txt-link-freetext" href=3D"https://www.ietf.org/mailman/lis=
tinfo/lsr">https://www.ietf.org/mailman/listinfo/lsr</a></span></p>
</blockquote>
</div>
</div>
</blockquote>
<br>
</blockquote>
<br>
<br>
<br>
</div>
</div>
</div>
</body>
</html>

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Date: Fri, 02 Mar 2018 07:07:49 +0100
From: Peter Psenak <ppsenak@cisco.com>
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To: "Goethals, Dirk (Nokia - BE/Antwerp)" <dirk.goethals@nokia.com>, Alexander Okonnikov <alexander.okonnikov@gmail.com>, "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
References: <292c4d7f-157b-6920-917a-5157fb2890aa@nokia.com> <2D3557F2-53EA-4C4B-9B00-474C5FF4EBAF@cisco.com> <26b261b4-00b1-4e01-ab4c-ede98883b155@Spark> <8D23AE85-3408-457E-A1CC-4B78157A11BE@cisco.com> <b9f19b6e-2771-9ab9-383e-ffacb788e010@gmail.com>, <d7399742-cf5e-2f48-9737-d9ad69683b06@gmail.com> <VI1PR07MB3293D02CFBA76D6FBCBBB645E2C60@VI1PR07MB3293.eurprd07.prod.outlook.com>
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Subject: Re: [Lsr] advertising tunnels in IGP
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Hi Dirk,

you can set the Local/Remote ID for any FA tunnel to 0 and all would 
just work fine. There are implementations doing that :)

thanks,
Peter


On 01/03/18 21:06 , Goethals, Dirk (Nokia - BE/Antwerp) wrote:
> Hi Alexander, Acee, Peter,
> Thanks for your prompt suggestions.
>
> Alexander,
> I’m also in favor of having something as simple as in OSPFV2.
> So, I’m somewere on the same track as you, i.e.
> 1) a flexible bidirectional check when nbrid=0, similar as unnumbered
> p2p in OSPFv2
> 2) during next hop resolution, when nbrid=0, pick up the local
> tunnelinfo iso neigbors
> ip address.
>
> Thanks,
> Dirk
>
> _____________________________
> From: Alexander Okonnikov <alexander.okonnikov@gmail.com>
> Sent: donderdag, maart 1, 2018 6:54 PM
> Subject: Re: [Lsr] advertising tunnels in IGP
> To: Acee Lindem (acee) <acee@cisco.com>, Goethals, Dirk (Nokia -
> BE/Antwerp) <dirk.goethals@nokia.com>, <lsr@ietf.org>
>
>
> Hi,
>
> I cannot find in RFC 5340 where pair of Interface ID/Neighbor Interface
> ID are used for two-way check for P2P link. RFC 5340 reuses SPF
> algorithm from RFC 2328. RFC 2328 says that W should have link back to
> V, but it also says (in footnote 23) that link from W to V does not
> necessarily matches to link from V to W. I.e. presence of two
> unidirectional links is enough for two-way check to be passed. Is it
> correct?
>
> If yes then, what if OSPFv3 router will set Neighbor Interface ID to 0
> for P2P link and the neighbor will do the same? How it will be treated
> by other routers while calculate SPF?
>
> Also, Neighbor Interface ID is used as reference for corresponding Link
> LSA while calculating next-hop. Per my understanding neighbor's IPv6
> link-local address is not needed (as well as neighbor's Link LSA),
> because LSP will be next-hop in this case.
>
> Thanks.
>
>
> 01.03.2018 20:08, Alexander Okonnikov пишет:
>>
>> Hi,
>>
>> Need for advertising of FA by both sides is dictated by OSPFv2 and
>> IS-IS, because they 1) check presence of adjacency in two directions
>> and 2) cannot distinguish FA from regular P2P link. If latter was
>> possible, then it would not be needed to perform two-way check for FA
>> (presence of FA just in forward direction means that ingress "link" on
>> remote neighbor is working; otherwise LSP in forward direction would
>> be broken). It can be generalized to all three protocols: if we can
>> somehow identify link type as FA, we don't need two-way check for FA.
>> We also don't need Neighbor Interface ID for FA in OSPFv3 in this case.
>>
>> Thank you.
>>
>>
>> 01.03.2018 19:56, Acee Lindem (acee) пишет:
>>>
>>> Hi Alexander,
>>>
>>> *From:*Alexander Okonnikov <alexander.okonnikov@gmail.com>
>>> *Date: *Thursday, March 1, 2018 at 11:40 AM
>>> *To: *"Goethals, Dirk (Nokia - BE/Antwerp)"
>>> <dirk.goethals@nokia.com>, "lsr@ietf.org" <lsr@ietf.org>, Acee
>>> Lindem<acee@cisco.com>
>>> *Subject: *Re: [Lsr] advertising tunnels in IGP
>>>
>>> Hi,
>>>
>>> I think that problem here is that two LSPs are two independent
>>> unidirectional links, rather than one bidirectional. Moreover, LSPs
>>> in two directions are not pairs (some two LSPs are not associated to
>>> each other), and amount of LSPs in each direction is not necessary
>>> the same. I could assume that some router uses Interface IDs for
>>> two-way check, but it is not so straightforward when we have deal
>>> with FAs.
>>>
>>> Acee, two-way check could be disabled on the router that is owner of
>>> FA, but how other routers will distinguish regular P2P from FA?
>>>
>>> Good point – all the transit routers need to agree on the interface IDs.
>>>
>>> Thanks,
>>>
>>> Acee
>>>
>>>
>>> Thank you.
>>>
>>> Best regards,
>>>
>>> Alexander Okonnikov
>>>
>>>
>>> 1 марта 2018 г., 19:37 +0300, Acee Lindem (acee) <acee@cisco.com>, писал:
>>>
>>>     Hi Dirk,
>>>
>>>     My memory has faded somewhat on Forwarding Adjacency (FA)
>>>     implementation. However, since basic MPLS LSPs are
>>>     unidirectional, doesn’t the SPF two-way check have to be disabled
>>>     anyway? If so, the Remote Interface ID doesn’t matter.
>>>
>>>     Thanks,
>>>     Acee
>>>
>>>     *From:*Lsr <lsr-bounces@ietf.org> on behalf of "Goethals, Dirk
>>>     (Nokia - BE/Antwerp)" <dirk.goethals@nokia.com>
>>>     *Date:* Thursday, March 1, 2018 at 11:06 AM
>>>     *To:* "lsr@ietf.org"<lsr@ietf.org>
>>>     *Subject:* [Lsr] advertising tunnels in IGP
>>>
>>>     Hi,
>>>     In OSPFv2 (and ISIS), we can add (RSVP) tunnels to the topology
>>>     by adding them as a unnumbered link in the router lsa.
>>>     In OSPFv3, we can only add a link to the router-lsa if the neighbor
>>>     interface ID is known.
>>>     So it looks like we can only add a tunnel to the OSPFv3 topology,
>>>     if we first exchanging hello packets over the tunnel.
>>>     Is that correct?
>>>     As this is not needed in the other IGPs, do
>>>     we have other possibilities?
>>>     Thx,
>>>     Dirk
>>>
>>>
>>>     _______________________________________________
>>>     Lsr mailing list
>>>     Lsr@ietf.org
>>>     https://www.ietf.org/mailman/listinfo/lsr
>>>
>>
>
>
>
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>


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Date: Fri, 2 Mar 2018 09:26:21 +0300
From: Alexander Okonnikov <alexander.okonnikov@gmail.com>
To: "=?utf-8?Q?Goethals=2C_Dirk_(Nokia_-_BE/Antwerp)?=" <dirk.goethals@nokia.com>, "Acee Lindem (acee)" <acee@cisco.com>,  "=?utf-8?Q?lsr=40ietf.org?=" <lsr@ietf.org>, Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [Lsr] advertising tunnels in IGP
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Hi Peter,

How then several interfaces could be distinguished=3F

Thank you.

Best regards,
Alexander Okonnikov

2 =D0=BC=D0=B0=D1=80=D1=82=D0=B0 2018 =D0=B3., 9:07 +0300, Peter Psenak <=
ppsenak=40cisco.com>, =D0=BF=D0=B8=D1=81=D0=B0=D0=BB:
> Hi Dirk,
>
> you can set the Local/Remote ID for any =46A tunnel to 0 and all would
> just work fine. There are implementations doing that :)
>
> thanks,
> Peter
>
>
> On 01/03/18 21:06 , Goethals, Dirk (Nokia - BE/Antwerp) wrote:
> > Hi Alexander, Acee, Peter,
> > Thanks for your prompt suggestions.
> >
> > Alexander,
> > I=E2=80=99m also in favor of having something as simple as in OSP=46V=
2.
> > So, I=E2=80=99m somewere on the same track as you, i.e.
> > 1) a flexible bidirectional check when nbrid=3D0, similar as unnumber=
ed
> > p2p in OSP=46v2
> > 2) during next hop resolution, when nbrid=3D0, pick up the local
> > tunnelinfo iso neigbors
> > ip address.
> >
> > Thanks,
> > Dirk
> >
> > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F
> > =46rom: Alexander Okonnikov <alexander.okonnikov=40gmail.com
> > Sent: donderdag, maart 1, 2018 6:54 PM
> > Subject: Re: =5BLsr=5D advertising tunnels in IGP
> > To: Acee Lindem (acee) <acee=40cisco.com>, Goethals, Dirk (Nokia -
> > BE/Antwerp) <dirk.goethals=40nokia.com>, <lsr=40ietf.org
> >
> >
> > Hi,
> >
> > I cannot find in R=46C 5340 where pair of Interface ID/Neighbor Inter=
face
> > ID are used for two-way check for P2P link. R=46C 5340 reuses SP=46
> > algorithm from R=46C 2328. R=46C 2328 says that W should have link ba=
ck to
> > V, but it also says (in footnote 23) that link from W to V does not
> > necessarily matches to link from V to W. I.e. presence of two
> > unidirectional links is enough for two-way check to be passed. Is it
> > correct=3F
> >
> > If yes then, what if OSP=46v3 router will set Neighbor Interface ID t=
o 0
> > for P2P link and the neighbor will do the same=3F How it will be trea=
ted
> > by other routers while calculate SP=46=3F
> >
> > Also, Neighbor Interface ID is used as reference for corresponding Li=
nk
> > LSA while calculating next-hop. Per my understanding neighbor's IPv6
> > link-local address is not needed (as well as neighbor's Link LSA),
> > because LSP will be next-hop in this case.
> >
> > Thanks.
> >
> >
> > 01.03.2018 20:08, Alexander Okonnikov =D0=BF=D0=B8=D1=88=D0=B5=D1=82:=

> > >
> > > Hi,
> > >
> > > Need for advertising of =46A by both sides is dictated by OSP=46v2 =
and
> > > IS-IS, because they 1) check presence of adjacency in two direction=
s
> > > and 2) cannot distinguish =46A from regular P2P link. If latter was=

> > > possible, then it would not be needed to perform two-way check for =
=46A
> > > (presence of =46A just in forward direction means that ingress =22l=
ink=22 on
> > > remote neighbor is working; otherwise LSP in forward direction woul=
d
> > > be broken). It can be generalized to all three protocols: if we can=

> > > somehow identify link type as =46A, we don't need two-way check for=
 =46A.
> > > We also don't need Neighbor Interface ID for =46A in OSP=46v3 in th=
is case.
> > >
> > > Thank you.
> > >
> > >
> > > 01.03.2018 19:56, Acee Lindem (acee) =D0=BF=D0=B8=D1=88=D0=B5=D1=82=
:
> > > >
> > > > Hi Alexander,
> > > >
> > > > *=46rom:*Alexander Okonnikov <alexander.okonnikov=40gmail.com
> > > > *Date: *Thursday, March 1, 2018 at 11:40 AM
> > > > *To: *=22Goethals, Dirk (Nokia - BE/Antwerp)=22
> > > > <dirk.goethals=40nokia.com>, =22lsr=40ietf.org=22 <lsr=40ietf.org=
>, Acee
> > > > Lindem<acee=40cisco.com
> > > > *Subject: *Re: =5BLsr=5D advertising tunnels in IGP
> > > >
> > > > Hi,
> > > >
> > > > I think that problem here is that two LSPs are two independent
> > > > unidirectional links, rather than one bidirectional. Moreover, LS=
Ps
> > > > in two directions are not pairs (some two LSPs are not associated=
 to
> > > > each other), and amount of LSPs in each direction is not necessar=
y
> > > > the same. I could assume that some router uses Interface IDs for
> > > > two-way check, but it is not so straightforward when we have deal=

> > > > with =46As.
> > > >
> > > > Acee, two-way check could be disabled on the router that is owner=
 of
> > > > =46A, but how other routers will distinguish regular P2P from =46=
A=3F
> > > >
> > > > Good point =E2=80=93 all the transit routers need to agree on the=
 interface IDs.
> > > >
> > > > Thanks,
> > > >
> > > > Acee
> > > >
> > > >
> > > > Thank you.
> > > >
> > > > Best regards,
> > > >
> > > > Alexander Okonnikov
> > > >
> > > >
> > > > 1 =D0=BC=D0=B0=D1=80=D1=82=D0=B0 2018 =D0=B3., 19:37 +0300, Acee =
Lindem (acee) <acee=40cisco.com>, =D0=BF=D0=B8=D1=81=D0=B0=D0=BB:
> > > >
> > > > Hi Dirk,
> > > >
> > > > My memory has faded somewhat on =46orwarding Adjacency (=46A)
> > > > implementation. However, since basic MPLS LSPs are
> > > > unidirectional, doesn=E2=80=99t the SP=46 two-way check have to b=
e disabled
> > > > anyway=3F If so, the Remote Interface ID doesn=E2=80=99t matter.
> > > >
> > > > Thanks,
> > > > Acee
> > > >
> > > > *=46rom:*Lsr <lsr-bounces=40ietf.org> on behalf of =22Goethals, D=
irk
> > > > (Nokia - BE/Antwerp)=22 <dirk.goethals=40nokia.com
> > > > *Date:* Thursday, March 1, 2018 at 11:06 AM
> > > > *To:* =22lsr=40ietf.org=22<lsr=40ietf.org
> > > > *Subject:* =5BLsr=5D advertising tunnels in IGP
> > > >
> > > > Hi,
> > > > In OSP=46v2 (and ISIS), we can add (RSVP) tunnels to the topology=

> > > > by adding them as a unnumbered link in the router lsa.
> > > > In OSP=46v3, we can only add a link to the router-lsa if the neig=
hbor
> > > > interface ID is known.
> > > > So it looks like we can only add a tunnel to the OSP=46v3 topolog=
y,
> > > > if we first exchanging hello packets over the tunnel.
> > > > Is that correct=3F
> > > > As this is not needed in the other IGPs, do
> > > > we have other possibilities=3F
> > > > Thx,
> > > > Dirk
> > > >
> > > >
> > > > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=

> > > > Lsr mailing list
> > > > Lsr=40ietf.org
> > > > https://www.ietf.org/mailman/listinfo/lsr
> > > >
> > >
> >
> >
> >
> >
> >
> > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F
> > Lsr mailing list
> > Lsr=40ietf.org
> > https://www.ietf.org/mailman/listinfo/lsr
> >
>

--5a98eeb3_79e2a9e3_44c4
Content-Type: text/html; charset="utf-8"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline

<html xmlns=3D=22http://www.w3.org/1999/xhtml=22>
<head>
<title></title>
</head>
<body>
<div name=3D=22messageBodySection=22>Hi Peter,<br />
<br />
How then several interfaces could be distinguished=3F<br />
<br />
Thank you.</div>
<div name=3D=22messageSignatureSection=22><br />
<div>Best regards,</div>
<div>Alexander Okonnikov<br /></div>
</div>
<div name=3D=22messageReplySection=22><br />
2 =D0=BC=D0=B0=D1=80=D1=82=D0=B0 2018 =D0=B3., 9:07 +0300, Peter Psenak &=
lt;ppsenak=40cisco.com&gt;, =D0=BF=D0=B8=D1=81=D0=B0=D0=BB:<br />
<blockquote type=3D=22cite=22>Hi Dirk,<br />
<br />
you can set the Local/Remote ID for any =46A tunnel to 0 and all would<br=
 />
just work fine. There are implementations doing that :)<br />
<br />
thanks,<br />
Peter<br />
<br />
<br />
On 01/03/18 21:06 , Goethals, Dirk (Nokia - BE/Antwerp) wrote:<br />
<blockquote type=3D=22cite=22>Hi Alexander, Acee, Peter,<br />
Thanks for your prompt suggestions.<br />
<br />
Alexander,<br />
I=E2=80=99m also in favor of having something as simple as in OSP=46V2.<b=
r />
So, I=E2=80=99m somewere on the same track as you, i.e.<br />
1) a flexible bidirectional check when nbrid=3D0, similar as unnumbered<b=
r />
p2p in OSP=46v2<br />
2) during next hop resolution, when nbrid=3D0, pick up the local<br />
tunnelinfo iso neigbors<br />
ip address.<br />
<br />
Thanks,<br />
Dirk<br />
<br />
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F<br />
=46rom: Alexander Okonnikov &lt;alexander.okonnikov=40gmail.com<br />
Sent: donderdag, maart 1, 2018 6:54 PM<br />
Subject: Re: =5BLsr=5D advertising tunnels in IGP<br />
To: Acee Lindem (acee) &lt;acee=40cisco.com&gt;, Goethals, Dirk (Nokia -<=
br />
BE/Antwerp) &lt;dirk.goethals=40nokia.com&gt;, &lt;lsr=40ietf.org<br />
<br />
<br />
Hi,<br />
<br />
I cannot find in R=46C 5340 where pair of Interface ID/Neighbor Interface=
<br />
ID are used for two-way check for P2P link. R=46C 5340 reuses SP=46<br />=

algorithm from R=46C 2328. R=46C 2328 says that W should have link back t=
o<br />
V, but it also says (in footnote 23) that link from W to V does not<br />=

necessarily matches to link from V to W. I.e. presence of two<br />
unidirectional links is enough for two-way check to be passed. Is it<br /=
>
correct=3F<br />
<br />
If yes then, what if OSP=46v3 router will set Neighbor Interface ID to 0<=
br />
for P2P link and the neighbor will do the same=3F How it will be treated<=
br />
by other routers while calculate SP=46=3F<br />
<br />
Also, Neighbor Interface ID is used as reference for corresponding Link<b=
r />
LSA while calculating next-hop. Per my understanding neighbor's IPv6<br /=
>
link-local address is not needed (as well as neighbor's Link LSA),<br />
because LSP will be next-hop in this case.<br />
<br />
Thanks.<br />
<br />
<br />
01.03.2018 20:08, Alexander Okonnikov =D0=BF=D0=B8=D1=88=D0=B5=D1=82:<br =
/>
<blockquote type=3D=22cite=22><br />
Hi,<br />
<br />
Need for advertising of =46A by both sides is dictated by OSP=46v2 and<br=
 />
IS-IS, because they 1) check presence of adjacency in two directions<br /=
>
and 2) cannot distinguish =46A from regular P2P link. If latter was<br />=

possible, then it would not be needed to perform two-way check for =46A<b=
r />
(presence of =46A just in forward direction means that ingress =22link=22=
 on<br />
remote neighbor is working; otherwise LSP in forward direction would<br /=
>
be broken). It can be generalized to all three protocols: if we can<br />=

somehow identify link type as =46A, we don't need two-way check for =46A.=
<br />
We also don't need Neighbor Interface ID for =46A in OSP=46v3 in this cas=
e.<br />
<br />
Thank you.<br />
<br />
<br />
01.03.2018 19:56, Acee Lindem (acee) =D0=BF=D0=B8=D1=88=D0=B5=D1=82:<br /=
>
<blockquote type=3D=22cite=22><br />
Hi Alexander,<br />
<br />
*=46rom:*Alexander Okonnikov &lt;alexander.okonnikov=40gmail.com<br />
*Date: *Thursday, March 1, 2018 at 11:40 AM<br />
*To: *=22Goethals, Dirk (Nokia - BE/Antwerp)=22<br />
&lt;dirk.goethals=40nokia.com&gt;, =22lsr=40ietf.org=22 &lt;lsr=40ietf.or=
g&gt;, Acee<br />
Lindem&lt;acee=40cisco.com<br />
*Subject: *Re: =5BLsr=5D advertising tunnels in IGP<br />
<br />
Hi,<br />
<br />
I think that problem here is that two LSPs are two independent<br />
unidirectional links, rather than one bidirectional. Moreover, LSPs<br />=

in two directions are not pairs (some two LSPs are not associated to<br /=
>
each other), and amount of LSPs in each direction is not necessary<br />
the same. I could assume that some router uses Interface IDs for<br />
two-way check, but it is not so straightforward when we have deal<br />
with =46As.<br />
<br />
Acee, two-way check could be disabled on the router that is owner of<br /=
>
=46A, but how other routers will distinguish regular P2P from =46A=3F<br =
/>
<br />
Good point =E2=80=93 all the transit routers need to agree on the interfa=
ce IDs.<br />
<br />
Thanks,<br />
<br />
Acee<br />
<br />
<br />
Thank you.<br />
<br />
Best regards,<br />
<br />
Alexander Okonnikov<br />
<br />
<br />
1 =D0=BC=D0=B0=D1=80=D1=82=D0=B0 2018 =D0=B3., 19:37 +0300, Acee Lindem (=
acee) &lt;acee=40cisco.com&gt;, =D0=BF=D0=B8=D1=81=D0=B0=D0=BB:<br />
<br />
Hi Dirk,<br />
<br />
My memory has faded somewhat on =46orwarding Adjacency (=46A)<br />
implementation. However, since basic MPLS LSPs are<br />
unidirectional, doesn=E2=80=99t the SP=46 two-way check have to be disabl=
ed<br />
anyway=3F If so, the Remote Interface ID doesn=E2=80=99t matter.<br />
<br />
Thanks,<br />
Acee<br />
<br />
*=46rom:*Lsr &lt;lsr-bounces=40ietf.org&gt; on behalf of =22Goethals, Dir=
k<br />
(Nokia - BE/Antwerp)=22 &lt;dirk.goethals=40nokia.com<br />
*Date:* Thursday, March 1, 2018 at 11:06 AM<br />
*To:* =22lsr=40ietf.org=22&lt;lsr=40ietf.org<br />
*Subject:* =5BLsr=5D advertising tunnels in IGP<br />
<br />
Hi,<br />
In OSP=46v2 (and ISIS), we can add (RSVP) tunnels to the topology<br />
by adding them as a unnumbered link in the router lsa.<br />
In OSP=46v3, we can only add a link to the router-lsa if the neighbor<br =
/>
interface ID is known.<br />
So it looks like we can only add a tunnel to the OSP=46v3 topology,<br />=

if we first exchanging hello packets over the tunnel.<br />
Is that correct=3F<br />
As this is not needed in the other IGPs, do<br />
we have other possibilities=3F<br />
Thx,<br />
Dirk<br />
<br />
<br />
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F<br />
Lsr mailing list<br />
Lsr=40ietf.org<br />
https://www.ietf.org/mailman/listinfo/lsr<br />
<br /></blockquote>
<br /></blockquote>
<br />
<br />
<br />
<br />
<br />
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F<br />
Lsr mailing list<br />
Lsr=40ietf.org<br />
https://www.ietf.org/mailman/listinfo/lsr<br />
<br /></blockquote>
<br /></blockquote>
</div>
</body>
</html>

--5a98eeb3_79e2a9e3_44c4--


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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/mXadNokUfZCIheSKRYjjEDAYZj0>
Subject: Re: [Lsr] advertising tunnels in IGP
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    Hi Alexander,<br>
    You don't need a nhop for tunnels, so why would you need <br>
    to distinguish the interfaces?<br>
    Dirk<br>
    <br>
    <div class="moz-cite-prefix">Op 2/03/2018 om 7:26 schreef Alexander
      Okonnikov:<br>
    </div>
    <blockquote cite="mid:33a9ec0b-f6f6-4ae6-851c-afbea9faf182@Spark"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
      <title></title>
      <div name="messageBodySection">Hi Peter,<br>
        <br>
        How then several interfaces could be distinguished?<br>
        <br>
        Thank you.</div>
      <div name="messageSignatureSection"><br>
        <div>Best regards,</div>
        <div>Alexander Okonnikov<br>
        </div>
      </div>
      <div name="messageReplySection"><br>
        2 марта 2018 г., 9:07 +0300, Peter Psenak
        <a class="moz-txt-link-rfc2396E" href="mailto:ppsenak@cisco.com">&lt;ppsenak@cisco.com&gt;</a>, писал:<br>
        <blockquote type="cite">Hi Dirk,<br>
          <br>
          you can set the Local/Remote ID for any FA tunnel to 0 and all
          would<br>
          just work fine. There are implementations doing that :)<br>
          <br>
          thanks,<br>
          Peter<br>
          <br>
          <br>
          On 01/03/18 21:06 , Goethals, Dirk (Nokia - BE/Antwerp) wrote:<br>
          <blockquote type="cite">Hi Alexander, Acee, Peter,<br>
            Thanks for your prompt suggestions.<br>
            <br>
            Alexander,<br>
            I’m also in favor of having something as simple as in
            OSPFV2.<br>
            So, I’m somewere on the same track as you, i.e.<br>
            1) a flexible bidirectional check when nbrid=0, similar as
            unnumbered<br>
            p2p in OSPFv2<br>
            2) during next hop resolution, when nbrid=0, pick up the
            local<br>
            tunnelinfo iso neigbors<br>
            ip address.<br>
            <br>
            Thanks,<br>
            Dirk<br>
            <br>
            _____________________________<br>
            From: Alexander Okonnikov &lt;<a class="moz-txt-link-abbreviated" href="mailto:alexander.okonnikov@gmail.com">alexander.okonnikov@gmail.com</a><br>
            Sent: donderdag, maart 1, 2018 6:54 PM<br>
            Subject: Re: [Lsr] advertising tunnels in IGP<br>
            To: Acee Lindem (acee) <a class="moz-txt-link-rfc2396E" href="mailto:acee@cisco.com">&lt;acee@cisco.com&gt;</a>, Goethals,
            Dirk (Nokia -<br>
            BE/Antwerp) <a class="moz-txt-link-rfc2396E" href="mailto:dirk.goethals@nokia.com">&lt;dirk.goethals@nokia.com&gt;</a>,
            &lt;<a class="moz-txt-link-abbreviated" href="mailto:lsr@ietf.org">lsr@ietf.org</a><br>
            <br>
            <br>
            Hi,<br>
            <br>
            I cannot find in RFC 5340 where pair of Interface
            ID/Neighbor Interface<br>
            ID are used for two-way check for P2P link. RFC 5340 reuses
            SPF<br>
            algorithm from RFC 2328. RFC 2328 says that W should have
            link back to<br>
            V, but it also says (in footnote 23) that link from W to V
            does not<br>
            necessarily matches to link from V to W. I.e. presence of
            two<br>
            unidirectional links is enough for two-way check to be
            passed. Is it<br>
            correct?<br>
            <br>
            If yes then, what if OSPFv3 router will set Neighbor
            Interface ID to 0<br>
            for P2P link and the neighbor will do the same? How it will
            be treated<br>
            by other routers while calculate SPF?<br>
            <br>
            Also, Neighbor Interface ID is used as reference for
            corresponding Link<br>
            LSA while calculating next-hop. Per my understanding
            neighbor's IPv6<br>
            link-local address is not needed (as well as neighbor's Link
            LSA),<br>
            because LSP will be next-hop in this case.<br>
            <br>
            Thanks.<br>
            <br>
            <br>
            01.03.2018 20:08, Alexander Okonnikov пишет:<br>
            <blockquote type="cite"><br>
              Hi,<br>
              <br>
              Need for advertising of FA by both sides is dictated by
              OSPFv2 and<br>
              IS-IS, because they 1) check presence of adjacency in two
              directions<br>
              and 2) cannot distinguish FA from regular P2P link. If
              latter was<br>
              possible, then it would not be needed to perform two-way
              check for FA<br>
              (presence of FA just in forward direction means that
              ingress "link" on<br>
              remote neighbor is working; otherwise LSP in forward
              direction would<br>
              be broken). It can be generalized to all three protocols:
              if we can<br>
              somehow identify link type as FA, we don't need two-way
              check for FA.<br>
              We also don't need Neighbor Interface ID for FA in OSPFv3
              in this case.<br>
              <br>
              Thank you.<br>
              <br>
              <br>
              01.03.2018 19:56, Acee Lindem (acee) пишет:<br>
              <blockquote type="cite"><br>
                Hi Alexander,<br>
                <br>
                *From:*Alexander Okonnikov
                &lt;<a class="moz-txt-link-abbreviated" href="mailto:alexander.okonnikov@gmail.com">alexander.okonnikov@gmail.com</a><br>
                *Date: *Thursday, March 1, 2018 at 11:40 AM<br>
                *To: *"Goethals, Dirk (Nokia - BE/Antwerp)"<br>
                <a class="moz-txt-link-rfc2396E" href="mailto:dirk.goethals@nokia.com">&lt;dirk.goethals@nokia.com&gt;</a>, <a class="moz-txt-link-rfc2396E" href="mailto:lsr@ietf.org">"lsr@ietf.org"</a>
                <a class="moz-txt-link-rfc2396E" href="mailto:lsr@ietf.org">&lt;lsr@ietf.org&gt;</a>, Acee<br>
                Lindem&lt;<a class="moz-txt-link-abbreviated" href="mailto:acee@cisco.com">acee@cisco.com</a><br>
                *Subject: *Re: [Lsr] advertising tunnels in IGP<br>
                <br>
                Hi,<br>
                <br>
                I think that problem here is that two LSPs are two
                independent<br>
                unidirectional links, rather than one bidirectional.
                Moreover, LSPs<br>
                in two directions are not pairs (some two LSPs are not
                associated to<br>
                each other), and amount of LSPs in each direction is not
                necessary<br>
                the same. I could assume that some router uses Interface
                IDs for<br>
                two-way check, but it is not so straightforward when we
                have deal<br>
                with FAs.<br>
                <br>
                Acee, two-way check could be disabled on the router that
                is owner of<br>
                FA, but how other routers will distinguish regular P2P
                from FA?<br>
                <br>
                Good point – all the transit routers need to agree on
                the interface IDs.<br>
                <br>
                Thanks,<br>
                <br>
                Acee<br>
                <br>
                <br>
                Thank you.<br>
                <br>
                Best regards,<br>
                <br>
                Alexander Okonnikov<br>
                <br>
                <br>
                1 марта 2018 г., 19:37 +0300, Acee Lindem (acee)
                <a class="moz-txt-link-rfc2396E" href="mailto:acee@cisco.com">&lt;acee@cisco.com&gt;</a>, писал:<br>
                <br>
                Hi Dirk,<br>
                <br>
                My memory has faded somewhat on Forwarding Adjacency
                (FA)<br>
                implementation. However, since basic MPLS LSPs are<br>
                unidirectional, doesn’t the SPF two-way check have to be
                disabled<br>
                anyway? If so, the Remote Interface ID doesn’t matter.<br>
                <br>
                Thanks,<br>
                Acee<br>
                <br>
                *From:*Lsr <a class="moz-txt-link-rfc2396E" href="mailto:lsr-bounces@ietf.org">&lt;lsr-bounces@ietf.org&gt;</a> on behalf of
                "Goethals, Dirk<br>
                (Nokia - BE/Antwerp)" &lt;<a class="moz-txt-link-abbreviated" href="mailto:dirk.goethals@nokia.com">dirk.goethals@nokia.com</a><br>
                *Date:* Thursday, March 1, 2018 at 11:06 AM<br>
                *To:* <a class="moz-txt-link-rfc2396E" href="mailto:lsr@ietf.org">"lsr@ietf.org"</a>&lt;<a class="moz-txt-link-abbreviated" href="mailto:lsr@ietf.org">lsr@ietf.org</a><br>
                *Subject:* [Lsr] advertising tunnels in IGP<br>
                <br>
                Hi,<br>
                In OSPFv2 (and ISIS), we can add (RSVP) tunnels to the
                topology<br>
                by adding them as a unnumbered link in the router lsa.<br>
                In OSPFv3, we can only add a link to the router-lsa if
                the neighbor<br>
                interface ID is known.<br>
                So it looks like we can only add a tunnel to the OSPFv3
                topology,<br>
                if we first exchanging hello packets over the tunnel.<br>
                Is that correct?<br>
                As this is not needed in the other IGPs, do<br>
                we have other possibilities?<br>
                Thx,<br>
                Dirk<br>
                <br>
                <br>
                _______________________________________________<br>
                Lsr mailing list<br>
                <a class="moz-txt-link-abbreviated" href="mailto:Lsr@ietf.org">Lsr@ietf.org</a><br>
                <a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/lsr">https://www.ietf.org/mailman/listinfo/lsr</a><br>
                <br>
              </blockquote>
              <br>
            </blockquote>
            <br>
            <br>
            <br>
            <br>
            <br>
            _______________________________________________<br>
            Lsr mailing list<br>
            <a class="moz-txt-link-abbreviated" href="mailto:Lsr@ietf.org">Lsr@ietf.org</a><br>
            <a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/lsr">https://www.ietf.org/mailman/listinfo/lsr</a><br>
            <br>
          </blockquote>
          <br>
        </blockquote>
      </div>
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Date: Fri, 02 Mar 2018 08:35:04 +0100
From: Peter Psenak <ppsenak@cisco.com>
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To: Dirk Goethals <dirk.goethals@nokia.com>, Alexander Okonnikov <alexander.okonnikov@gmail.com>, "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
References: <292c4d7f-157b-6920-917a-5157fb2890aa@nokia.com> <2D3557F2-53EA-4C4B-9B00-474C5FF4EBAF@cisco.com> <26b261b4-00b1-4e01-ab4c-ede98883b155@Spark> <8D23AE85-3408-457E-A1CC-4B78157A11BE@cisco.com> <b9f19b6e-2771-9ab9-383e-ffacb788e010@gmail.com> <d7399742-cf5e-2f48-9737-d9ad69683b06@gmail.com> <VI1PR07MB3293D02CFBA76D6FBCBBB645E2C60@VI1PR07MB3293.eurprd07.prod.outlook.com> <5A98EA35.1050704@cisco.com> <33a9ec0b-f6f6-4ae6-851c-afbea9faf182@Spark> <66ed0fee-8ec8-db14-a1bb-8a11ecf18e67@nokia.com>
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Subject: Re: [Lsr] advertising tunnels in IGP
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On 02/03/18 08:25 , Dirk Goethals wrote:
> Hi Alexander,
> You don't need a nhop for tunnels, so why would you need
> to distinguish the interfaces?

right. No need to, given that you relaxed the 2WC by using zeros for 
interface IDs? ECMP on the tunnel-head is a local matter.

thanks,
Peter
> Dirk
>
> Op 2/03/2018 om 7:26 schreef Alexander Okonnikov:
>> Hi Peter,
>>
>> How then several interfaces could be distinguished?
>>
>> Thank you.
>>
>> Best regards,
>> Alexander Okonnikov
>>
>> 2 марта 2018 г., 9:07 +0300, Peter Psenak <ppsenak@cisco.com>, писал:
>>> Hi Dirk,
>>>
>>> you can set the Local/Remote ID for any FA tunnel to 0 and all would
>>> just work fine. There are implementations doing that :)
>>>
>>> thanks,
>>> Peter
>>>
>>>
>>> On 01/03/18 21:06 , Goethals, Dirk (Nokia - BE/Antwerp) wrote:
>>>> Hi Alexander, Acee, Peter,
>>>> Thanks for your prompt suggestions.
>>>>
>>>> Alexander,
>>>> I’m also in favor of having something as simple as in OSPFV2.
>>>> So, I’m somewere on the same track as you, i.e.
>>>> 1) a flexible bidirectional check when nbrid=0, similar as unnumbered
>>>> p2p in OSPFv2
>>>> 2) during next hop resolution, when nbrid=0, pick up the local
>>>> tunnelinfo iso neigbors
>>>> ip address.
>>>>
>>>> Thanks,
>>>> Dirk
>>>>
>>>> _____________________________
>>>> From: Alexander Okonnikov <alexander.okonnikov@gmail.com
>>>> Sent: donderdag, maart 1, 2018 6:54 PM
>>>> Subject: Re: [Lsr] advertising tunnels in IGP
>>>> To: Acee Lindem (acee) <acee@cisco.com>, Goethals, Dirk (Nokia -
>>>> BE/Antwerp) <dirk.goethals@nokia.com>, <lsr@ietf.org
>>>>
>>>>
>>>> Hi,
>>>>
>>>> I cannot find in RFC 5340 where pair of Interface ID/Neighbor Interface
>>>> ID are used for two-way check for P2P link. RFC 5340 reuses SPF
>>>> algorithm from RFC 2328. RFC 2328 says that W should have link back to
>>>> V, but it also says (in footnote 23) that link from W to V does not
>>>> necessarily matches to link from V to W. I.e. presence of two
>>>> unidirectional links is enough for two-way check to be passed. Is it
>>>> correct?
>>>>
>>>> If yes then, what if OSPFv3 router will set Neighbor Interface ID to 0
>>>> for P2P link and the neighbor will do the same? How it will be treated
>>>> by other routers while calculate SPF?
>>>>
>>>> Also, Neighbor Interface ID is used as reference for corresponding Link
>>>> LSA while calculating next-hop. Per my understanding neighbor's IPv6
>>>> link-local address is not needed (as well as neighbor's Link LSA),
>>>> because LSP will be next-hop in this case.
>>>>
>>>> Thanks.
>>>>
>>>>
>>>> 01.03.2018 20:08, Alexander Okonnikov пишет:
>>>>>
>>>>> Hi,
>>>>>
>>>>> Need for advertising of FA by both sides is dictated by OSPFv2 and
>>>>> IS-IS, because they 1) check presence of adjacency in two directions
>>>>> and 2) cannot distinguish FA from regular P2P link. If latter was
>>>>> possible, then it would not be needed to perform two-way check for FA
>>>>> (presence of FA just in forward direction means that ingress "link" on
>>>>> remote neighbor is working; otherwise LSP in forward direction would
>>>>> be broken). It can be generalized to all three protocols: if we can
>>>>> somehow identify link type as FA, we don't need two-way check for FA.
>>>>> We also don't need Neighbor Interface ID for FA in OSPFv3 in this case.
>>>>>
>>>>> Thank you.
>>>>>
>>>>>
>>>>> 01.03.2018 19:56, Acee Lindem (acee) пишет:
>>>>>>
>>>>>> Hi Alexander,
>>>>>>
>>>>>> *From:*Alexander Okonnikov <alexander.okonnikov@gmail.com
>>>>>> *Date: *Thursday, March 1, 2018 at 11:40 AM
>>>>>> *To: *"Goethals, Dirk (Nokia - BE/Antwerp)"
>>>>>> <dirk.goethals@nokia.com>, "lsr@ietf.org" <lsr@ietf.org>, Acee
>>>>>> Lindem<acee@cisco.com
>>>>>> *Subject: *Re: [Lsr] advertising tunnels in IGP
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I think that problem here is that two LSPs are two independent
>>>>>> unidirectional links, rather than one bidirectional. Moreover, LSPs
>>>>>> in two directions are not pairs (some two LSPs are not associated to
>>>>>> each other), and amount of LSPs in each direction is not necessary
>>>>>> the same. I could assume that some router uses Interface IDs for
>>>>>> two-way check, but it is not so straightforward when we have deal
>>>>>> with FAs.
>>>>>>
>>>>>> Acee, two-way check could be disabled on the router that is owner of
>>>>>> FA, but how other routers will distinguish regular P2P from FA?
>>>>>>
>>>>>> Good point – all the transit routers need to agree on the
>>>>>> interface IDs.
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> Acee
>>>>>>
>>>>>>
>>>>>> Thank you.
>>>>>>
>>>>>> Best regards,
>>>>>>
>>>>>> Alexander Okonnikov
>>>>>>
>>>>>>
>>>>>> 1 марта 2018 г., 19:37 +0300, Acee Lindem (acee) <acee@cisco.com>,
>>>>>> писал:
>>>>>>
>>>>>> Hi Dirk,
>>>>>>
>>>>>> My memory has faded somewhat on Forwarding Adjacency (FA)
>>>>>> implementation. However, since basic MPLS LSPs are
>>>>>> unidirectional, doesn’t the SPF two-way check have to be disabled
>>>>>> anyway? If so, the Remote Interface ID doesn’t matter.
>>>>>>
>>>>>> Thanks,
>>>>>> Acee
>>>>>>
>>>>>> *From:*Lsr <lsr-bounces@ietf.org> on behalf of "Goethals, Dirk
>>>>>> (Nokia - BE/Antwerp)" <dirk.goethals@nokia.com
>>>>>> *Date:* Thursday, March 1, 2018 at 11:06 AM
>>>>>> *To:* "lsr@ietf.org"<lsr@ietf.org
>>>>>> *Subject:* [Lsr] advertising tunnels in IGP
>>>>>>
>>>>>> Hi,
>>>>>> In OSPFv2 (and ISIS), we can add (RSVP) tunnels to the topology
>>>>>> by adding them as a unnumbered link in the router lsa.
>>>>>> In OSPFv3, we can only add a link to the router-lsa if the neighbor
>>>>>> interface ID is known.
>>>>>> So it looks like we can only add a tunnel to the OSPFv3 topology,
>>>>>> if we first exchanging hello packets over the tunnel.
>>>>>> Is that correct?
>>>>>> As this is not needed in the other IGPs, do
>>>>>> we have other possibilities?
>>>>>> Thx,
>>>>>> Dirk
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> Lsr mailing list
>>>>>> Lsr@ietf.org
>>>>>> https://www.ietf.org/mailman/listinfo/lsr
>>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Lsr mailing list
>>>> Lsr@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/lsr
>>>>
>>>
>
> .


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To: Peter Psenak <ppsenak@cisco.com>, Dirk Goethals <dirk.goethals@nokia.com>, "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
References: <292c4d7f-157b-6920-917a-5157fb2890aa@nokia.com> <2D3557F2-53EA-4C4B-9B00-474C5FF4EBAF@cisco.com> <26b261b4-00b1-4e01-ab4c-ede98883b155@Spark> <8D23AE85-3408-457E-A1CC-4B78157A11BE@cisco.com> <b9f19b6e-2771-9ab9-383e-ffacb788e010@gmail.com> <d7399742-cf5e-2f48-9737-d9ad69683b06@gmail.com> <VI1PR07MB3293D02CFBA76D6FBCBBB645E2C60@VI1PR07MB3293.eurprd07.prod.outlook.com> <5A98EA35.1050704@cisco.com> <33a9ec0b-f6f6-4ae6-851c-afbea9faf182@Spark> <66ed0fee-8ec8-db14-a1bb-8a11ecf18e67@nokia.com> <5A98FEA8.20003@cisco.com>
From: Alexander Okonnikov <alexander.okonnikov@gmail.com>
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Date: Fri, 2 Mar 2018 10:58:08 +0300
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Subject: Re: [Lsr] advertising tunnels in IGP
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My concern is about management aspect - how two or more interfaces with 
the same ID will be treated by management system?


02.03.2018 10:35, Peter Psenak пишет:
> On 02/03/18 08:25 , Dirk Goethals wrote:
>> Hi Alexander,
>> You don't need a nhop for tunnels, so why would you need
>> to distinguish the interfaces?
>
> right. No need to, given that you relaxed the 2WC by using zeros for 
> interface IDs? ECMP on the tunnel-head is a local matter.
>
> thanks,
> Peter
>> Dirk
>>
>> Op 2/03/2018 om 7:26 schreef Alexander Okonnikov:
>>> Hi Peter,
>>>
>>> How then several interfaces could be distinguished?
>>>
>>> Thank you.
>>>
>>> Best regards,
>>> Alexander Okonnikov
>>>
>>> 2 марта 2018 г., 9:07 +0300, Peter Psenak <ppsenak@cisco.com>, писал:
>>>> Hi Dirk,
>>>>
>>>> you can set the Local/Remote ID for any FA tunnel to 0 and all would
>>>> just work fine. There are implementations doing that :)
>>>>
>>>> thanks,
>>>> Peter
>>>>
>>>>
>>>> On 01/03/18 21:06 , Goethals, Dirk (Nokia - BE/Antwerp) wrote:
>>>>> Hi Alexander, Acee, Peter,
>>>>> Thanks for your prompt suggestions.
>>>>>
>>>>> Alexander,
>>>>> I’m also in favor of having something as simple as in OSPFV2.
>>>>> So, I’m somewere on the same track as you, i.e.
>>>>> 1) a flexible bidirectional check when nbrid=0, similar as unnumbered
>>>>> p2p in OSPFv2
>>>>> 2) during next hop resolution, when nbrid=0, pick up the local
>>>>> tunnelinfo iso neigbors
>>>>> ip address.
>>>>>
>>>>> Thanks,
>>>>> Dirk
>>>>>
>>>>> _____________________________
>>>>> From: Alexander Okonnikov <alexander.okonnikov@gmail.com
>>>>> Sent: donderdag, maart 1, 2018 6:54 PM
>>>>> Subject: Re: [Lsr] advertising tunnels in IGP
>>>>> To: Acee Lindem (acee) <acee@cisco.com>, Goethals, Dirk (Nokia -
>>>>> BE/Antwerp) <dirk.goethals@nokia.com>, <lsr@ietf.org
>>>>>
>>>>>
>>>>> Hi,
>>>>>
>>>>> I cannot find in RFC 5340 where pair of Interface ID/Neighbor 
>>>>> Interface
>>>>> ID are used for two-way check for P2P link. RFC 5340 reuses SPF
>>>>> algorithm from RFC 2328. RFC 2328 says that W should have link 
>>>>> back to
>>>>> V, but it also says (in footnote 23) that link from W to V does not
>>>>> necessarily matches to link from V to W. I.e. presence of two
>>>>> unidirectional links is enough for two-way check to be passed. Is it
>>>>> correct?
>>>>>
>>>>> If yes then, what if OSPFv3 router will set Neighbor Interface ID 
>>>>> to 0
>>>>> for P2P link and the neighbor will do the same? How it will be 
>>>>> treated
>>>>> by other routers while calculate SPF?
>>>>>
>>>>> Also, Neighbor Interface ID is used as reference for corresponding 
>>>>> Link
>>>>> LSA while calculating next-hop. Per my understanding neighbor's IPv6
>>>>> link-local address is not needed (as well as neighbor's Link LSA),
>>>>> because LSP will be next-hop in this case.
>>>>>
>>>>> Thanks.
>>>>>
>>>>>
>>>>> 01.03.2018 20:08, Alexander Okonnikov пишет:
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> Need for advertising of FA by both sides is dictated by OSPFv2 and
>>>>>> IS-IS, because they 1) check presence of adjacency in two directions
>>>>>> and 2) cannot distinguish FA from regular P2P link. If latter was
>>>>>> possible, then it would not be needed to perform two-way check 
>>>>>> for FA
>>>>>> (presence of FA just in forward direction means that ingress 
>>>>>> "link" on
>>>>>> remote neighbor is working; otherwise LSP in forward direction would
>>>>>> be broken). It can be generalized to all three protocols: if we can
>>>>>> somehow identify link type as FA, we don't need two-way check for 
>>>>>> FA.
>>>>>> We also don't need Neighbor Interface ID for FA in OSPFv3 in this 
>>>>>> case.
>>>>>>
>>>>>> Thank you.
>>>>>>
>>>>>>
>>>>>> 01.03.2018 19:56, Acee Lindem (acee) пишет:
>>>>>>>
>>>>>>> Hi Alexander,
>>>>>>>
>>>>>>> *From:*Alexander Okonnikov <alexander.okonnikov@gmail.com
>>>>>>> *Date: *Thursday, March 1, 2018 at 11:40 AM
>>>>>>> *To: *"Goethals, Dirk (Nokia - BE/Antwerp)"
>>>>>>> <dirk.goethals@nokia.com>, "lsr@ietf.org" <lsr@ietf.org>, Acee
>>>>>>> Lindem<acee@cisco.com
>>>>>>> *Subject: *Re: [Lsr] advertising tunnels in IGP
>>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> I think that problem here is that two LSPs are two independent
>>>>>>> unidirectional links, rather than one bidirectional. Moreover, LSPs
>>>>>>> in two directions are not pairs (some two LSPs are not 
>>>>>>> associated to
>>>>>>> each other), and amount of LSPs in each direction is not necessary
>>>>>>> the same. I could assume that some router uses Interface IDs for
>>>>>>> two-way check, but it is not so straightforward when we have deal
>>>>>>> with FAs.
>>>>>>>
>>>>>>> Acee, two-way check could be disabled on the router that is 
>>>>>>> owner of
>>>>>>> FA, but how other routers will distinguish regular P2P from FA?
>>>>>>>
>>>>>>> Good point – all the transit routers need to agree on the
>>>>>>> interface IDs.
>>>>>>>
>>>>>>> Thanks,
>>>>>>>
>>>>>>> Acee
>>>>>>>
>>>>>>>
>>>>>>> Thank you.
>>>>>>>
>>>>>>> Best regards,
>>>>>>>
>>>>>>> Alexander Okonnikov
>>>>>>>
>>>>>>>
>>>>>>> 1 марта 2018 г., 19:37 +0300, Acee Lindem (acee) <acee@cisco.com>,
>>>>>>> писал:
>>>>>>>
>>>>>>> Hi Dirk,
>>>>>>>
>>>>>>> My memory has faded somewhat on Forwarding Adjacency (FA)
>>>>>>> implementation. However, since basic MPLS LSPs are
>>>>>>> unidirectional, doesn’t the SPF two-way check have to be disabled
>>>>>>> anyway? If so, the Remote Interface ID doesn’t matter.
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Acee
>>>>>>>
>>>>>>> *From:*Lsr <lsr-bounces@ietf.org> on behalf of "Goethals, Dirk
>>>>>>> (Nokia - BE/Antwerp)" <dirk.goethals@nokia.com
>>>>>>> *Date:* Thursday, March 1, 2018 at 11:06 AM
>>>>>>> *To:* "lsr@ietf.org"<lsr@ietf.org
>>>>>>> *Subject:* [Lsr] advertising tunnels in IGP
>>>>>>>
>>>>>>> Hi,
>>>>>>> In OSPFv2 (and ISIS), we can add (RSVP) tunnels to the topology
>>>>>>> by adding them as a unnumbered link in the router lsa.
>>>>>>> In OSPFv3, we can only add a link to the router-lsa if the neighbor
>>>>>>> interface ID is known.
>>>>>>> So it looks like we can only add a tunnel to the OSPFv3 topology,
>>>>>>> if we first exchanging hello packets over the tunnel.
>>>>>>> Is that correct?
>>>>>>> As this is not needed in the other IGPs, do
>>>>>>> we have other possibilities?
>>>>>>> Thx,
>>>>>>> Dirk
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Lsr mailing list
>>>>>>> Lsr@ietf.org
>>>>>>> https://www.ietf.org/mailman/listinfo/lsr
>>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Lsr mailing list
>>>>> Lsr@ietf.org
>>>>> https://www.ietf.org/mailman/listinfo/lsr
>>>>>
>>>>
>>
>> .
>


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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 Link State Routing WG of the IETF.

        Title           : Yang Data Model for OSPF Protocol
        Authors         : Derek Yeung
                          Yingzhen Qu
                          Jeffrey Zhang
                          Ing-Wher Chen
                          Acee Lindem
	Filename        : draft-ietf-ospf-yang-10.txt
	Pages           : 106
	Date            : 2018-03-03

Abstract:
   This document defines a YANG data model that can be used to configure
   and manage OSPF.


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

There are also htmlized versions available at:
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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 Link State Routing WG of the IETF.

        Title           : Yang Data Model for OSPF SR (Segment Routing) Protocol
        Authors         : Derek Yeung
                          Yingzhen Qu
                          Jeffrey Zhang
                          Ing-Wher Chen
                          Acee Lindem
	Filename        : draft-ietf-ospf-sr-yang-04.txt
	Pages           : 24
	Date            : 2018-03-03

Abstract:
   This document defines a YANG data model that can be used to configure
   and manage OSPF Segment Routing.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-sr-yang/

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To: lsr-chairs@ietf.org
Cc: lsr@ietf.org, akatlas@gmail.com
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Subject: [Lsr] Request slot for LSR@101 - draft-eckert-teas-bier-te-framework
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Dear LSR WG chairs,

I am hereby requesting a slot for LSR WG @IETF101 to present subject draft.

At the core of the proposed framework for the control plane of BIER-TE is
a proposed topology model for BIER-TE to allow path calculation (and other
consistency calculation) - distributed through the IGPs. 

I would like to get early feedback before we would start to work on the
actual encoding of this topology information into IGP LSA/LSP types.

Cheers
    Toerless


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Toerless Eckert <tte@cs.fau.de>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
CC: "lsr@ietf.org" <lsr@ietf.org>, "akatlas@gmail.com" <akatlas@gmail.com>
Thread-Topic: [Lsr] Request slot for LSR@101 - draft-eckert-teas-bier-te-framework
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Subject: Re: [Lsr] Request slot for LSR@101 - draft-eckert-teas-bier-te-framework
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From nobody Tue Mar  6 15:13:01 2018
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Date: Wed, 7 Mar 2018 00:12:48 +0100
From: Toerless Eckert <tte@cs.fau.de>
To: "Acee Lindem (acee)" <acee@cisco.com>
Cc: "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "akatlas@gmail.com" <akatlas@gmail.com>
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Subject: Re: [Lsr] Request slot for LSR@101 - draft-eckert-teas-bier-te-framework
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Thanks, Acee - too bad.

Very much a fan of creation of LSR. Sad that it meant moving from
two underused WG meetings to one WG meeting that does not have enough
time for new work. Reminds me of TSVWG. *sigh*

Well, i guess all i am left with is to ask LSR WG members to attend TEAS 
on monday and hope my request for slot there will be successful.  Feedback
on the proposed topology model is important for the design.

Cheers
    Toerless

P.S.: When are requests for slots LSR@IEF102 opening up ? ;-))

On Tue, Mar 06, 2018 at 10:44:44PM +0000, Acee Lindem (acee) wrote:
> Hi Toerless,
> 
> Unfortunately, we have a very full agenda already and are not taking additional presentation for IETF 101. Additionally, you're going to need to present it in TEAS anyway due to their mandate... 
> 
> Thanks,
> Acee 
> 
> ???On 3/6/18, 4:56 PM, "Lsr on behalf of Toerless Eckert" <lsr-bounces@ietf.org on behalf of tte@cs.fau.de> wrote:
> 
>     Dear LSR WG chairs,
>     
>     I am hereby requesting a slot for LSR WG @IETF101 to present subject draft.
>     
>     At the core of the proposed framework for the control plane of BIER-TE is
>     a proposed topology model for BIER-TE to allow path calculation (and other
>     consistency calculation) - distributed through the IGPs. 
>     
>     I would like to get early feedback before we would start to work on the
>     actual encoding of this topology information into IGP LSA/LSP types.
>     
>     Cheers
>         Toerless
>     
>     _______________________________________________
>     Lsr mailing list
>     Lsr@ietf.org
>     https://www.ietf.org/mailman/listinfo/lsr
>     


From nobody Wed Mar  7 02:22:19 2018
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From: Christian Hopps <chopps@chopps.org>
To: Toerless Eckert <tte@cs.fau.de>
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Subject: Re: [Lsr] Request slot for LSR@101 - draft-eckert-teas-bier-te-framework
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Toerless Eckert <tte@cs.fau.de> writes:

> Thanks, Acee - too bad.
>
> Very much a fan of creation of LSR. Sad that it meant moving from
> two underused WG meetings to one WG meeting that does not have enough
> time for new work. Reminds me of TSVWG. *sigh*

Well now that's not really fair, is it? This is our second meeting, first as LSR and we didn't run out of time in the initial joint session.

Given that apparently you need to present in TEAS first anyway it seems like 102 is likely a better fit for an encoding presentation anyway. I'm fine with you requesting a time slot in 102 right now if you want. We can also put you on standby for 101 if we have any cancellations. :)

Thanks,
Chris.

> Well, i guess all i am left with is to ask LSR WG members to attend TEAS
> on monday and hope my request for slot there will be successful.  Feedback
> on the proposed topology model is important for the design.

>
> Cheers
>     Toerless
>
> P.S.: When are requests for slots LSR@IEF102 opening up ? ;-))
>
> On Tue, Mar 06, 2018 at 10:44:44PM +0000, Acee Lindem (acee) wrote:
>> Hi Toerless,
>>
>> Unfortunately, we have a very full agenda already and are not taking additional presentation for IETF 101. Additionally, you're going to need to present it in TEAS anyway due to their mandate...
>>
>> Thanks,
>> Acee
>>
>> ???On 3/6/18, 4:56 PM, "Lsr on behalf of Toerless Eckert" <lsr-bounces@ietf.org on behalf of tte@cs.fau.de> wrote:
>>
>>     Dear LSR WG chairs,
>>
>>     I am hereby requesting a slot for LSR WG @IETF101 to present subject draft.
>>
>>     At the core of the proposed framework for the control plane of BIER-TE is
>>     a proposed topology model for BIER-TE to allow path calculation (and other
>>     consistency calculation) - distributed through the IGPs.
>>
>>     I would like to get early feedback before we would start to work on the
>>     actual encoding of this topology information into IGP LSA/LSP types.
>>
>>     Cheers
>>         Toerless
>>
>>     _______________________________________________
>>     Lsr mailing list
>>     Lsr@ietf.org
>>     https://www.ietf.org/mailman/listinfo/lsr
>>


From nobody Wed Mar  7 03:20:15 2018
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From: Lou Berger <lberger@labn.net>
To: Christian Hopps <chopps@chopps.org>, Toerless Eckert <tte@cs.fau.de>
CC: <lsr-chairs@ietf.org>, <akatlas@gmail.com>, "Acee Lindem (acee)" <acee@cisco.com>, <lsr@ietf.org>
Date: Wed, 07 Mar 2018 06:20:04 -0500
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/3e43wrhnFGH3p4_ZSRZPSWGosSs>
Subject: Re: [Lsr] Request slot for LSR@101 - draft-eckert-teas-bier-te-framework
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FWIW TEAS, which clashes with LSR, is in the process of being swapped wth 
CCAMP.  I expect this should be finalized today or tomorrow...

Lou


On March 7, 2018 5:22:59 AM Christian Hopps <chopps@chopps.org> wrote:

>
> Toerless Eckert <tte@cs.fau.de> writes:
>
>> Thanks, Acee - too bad.
>>
>> Very much a fan of creation of LSR. Sad that it meant moving from
>> two underused WG meetings to one WG meeting that does not have enough
>> time for new work. Reminds me of TSVWG. *sigh*
>
> Well now that's not really fair, is it? This is our second meeting, first 
> as LSR and we didn't run out of time in the initial joint session.
>
> Given that apparently you need to present in TEAS first anyway it seems 
> like 102 is likely a better fit for an encoding presentation anyway. I'm 
> fine with you requesting a time slot in 102 right now if you want. We can 
> also put you on standby for 101 if we have any cancellations. :)
>
> Thanks,
> Chris.
>
>> Well, i guess all i am left with is to ask LSR WG members to attend TEAS
>> on monday and hope my request for slot there will be successful.  Feedback
>> on the proposed topology model is important for the design.
>
>>
>> Cheers
>>     Toerless
>>
>> P.S.: When are requests for slots LSR@IEF102 opening up ? ;-))
>>
>> On Tue, Mar 06, 2018 at 10:44:44PM +0000, Acee Lindem (acee) wrote:
>>> Hi Toerless,
>>>
>>> Unfortunately, we have a very full agenda already and are not taking 
>>> additional presentation for IETF 101. Additionally, you're going to need to 
>>> present it in TEAS anyway due to their mandate...
>>>
>>> Thanks,
>>> Acee
>>>
>>> ???On 3/6/18, 4:56 PM, "Lsr on behalf of Toerless Eckert" 
>>> <lsr-bounces@ietf.org on behalf of tte@cs.fau.de> wrote:
>>>
>>>     Dear LSR WG chairs,
>>>
>>>     I am hereby requesting a slot for LSR WG @IETF101 to present subject draft.
>>>
>>>     At the core of the proposed framework for the control plane of BIER-TE is
>>>     a proposed topology model for BIER-TE to allow path calculation (and other
>>>     consistency calculation) - distributed through the IGPs.
>>>
>>>     I would like to get early feedback before we would start to work on the
>>>     actual encoding of this topology information into IGP LSA/LSP types.
>>>
>>>     Cheers
>>>         Toerless
>>>
>>>     _______________________________________________
>>>     Lsr mailing list
>>>     Lsr@ietf.org
>>>     https://www.ietf.org/mailman/listinfo/lsr
>>>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>



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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Lou Berger <lberger@labn.net>, Christian Hopps <chopps@chopps.org>, Toerless Eckert <tte@cs.fau.de>
CC: "lsr@ietf.org" <lsr@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, "akatlas@gmail.com" <akatlas@gmail.com>
Thread-Topic: [Lsr] Request slot for LSR@101 - draft-eckert-teas-bier-te-framework
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Date: Wed, 7 Mar 2018 12:09:21 +0000
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References: <20180306215625.GQ15215@faui40p.informatik.uni-erlangen.de> <AF85495F-A862-4689-8F4E-6513AECDAF50@cisco.com> <20180306231248.GS15215@faui40p.informatik.uni-erlangen.de> <87woyojics.fsf@chopps.org> <162003086b8.27d3.9b4188e636579690ba6c69f2c8a0f1fd@labn.net>
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Subject: Re: [Lsr] Request slot for LSR@101 - draft-eckert-teas-bier-te-framework
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From nobody Wed Mar  7 08:24:45 2018
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Date: Wed, 7 Mar 2018 17:24:36 +0100
From: Toerless Eckert <tte@cs.fau.de>
To: "Acee Lindem (acee)" <acee@cisco.com>
Cc: Lou Berger <lberger@labn.net>, Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>, "akatlas@gmail.com" <akatlas@gmail.com>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
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Subject: Re: [Lsr] Request slot for LSR@101 - draft-eckert-teas-bier-te-framework
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Thanks, Acee.

Hadn't considered RTG yet at all. Not sure which piece of the
puzzle they would claim responsibility for...

Cheers
   Toerless

On Wed, Mar 07, 2018 at 12:09:21PM +0000, Acee Lindem (acee) wrote:
> Hi Lou, 
> 
> I had looked at the IETF agenda yesterday while we were considering this presentation and your request for a swap of CCAMP and TEAS had already been fulfilled - https://datatracker.ietf.org/meeting/agenda.html
> 
> So, given that this BIER TE Framework presentation is also being presented in the BIER WG, IETF 101 attendees should have ample opportunity to consume it. I won't even suggest it be presented in the RTG WG... ;^) 
> 
> Thanks,
> Acee
> 
> 
> ???On 3/7/18, 6:20 AM, "Lsr on behalf of Lou Berger" <lsr-bounces@ietf.org on behalf of lberger@labn.net> wrote:
> 
>     FWIW TEAS, which clashes with LSR, is in the process of being swapped wth 
>     CCAMP.  I expect this should be finalized today or tomorrow...
>     
>     Lou
>     
>     
>     On March 7, 2018 5:22:59 AM Christian Hopps <chopps@chopps.org> wrote:
>     
>     >
>     > Toerless Eckert <tte@cs.fau.de> writes:
>     >
>     >> Thanks, Acee - too bad.
>     >>
>     >> Very much a fan of creation of LSR. Sad that it meant moving from
>     >> two underused WG meetings to one WG meeting that does not have enough
>     >> time for new work. Reminds me of TSVWG. *sigh*
>     >
>     > Well now that's not really fair, is it? This is our second meeting, first 
>     > as LSR and we didn't run out of time in the initial joint session.
>     >
>     > Given that apparently you need to present in TEAS first anyway it seems 
>     > like 102 is likely a better fit for an encoding presentation anyway. I'm 
>     > fine with you requesting a time slot in 102 right now if you want. We can 
>     > also put you on standby for 101 if we have any cancellations. :)
>     >
>     > Thanks,
>     > Chris.
>     >
>     >> Well, i guess all i am left with is to ask LSR WG members to attend TEAS
>     >> on monday and hope my request for slot there will be successful.  Feedback
>     >> on the proposed topology model is important for the design.
>     >
>     >>
>     >> Cheers
>     >>     Toerless
>     >>
>     >> P.S.: When are requests for slots LSR@IEF102 opening up ? ;-))
>     >>
>     >> On Tue, Mar 06, 2018 at 10:44:44PM +0000, Acee Lindem (acee) wrote:
>     >>> Hi Toerless,
>     >>>
>     >>> Unfortunately, we have a very full agenda already and are not taking 
>     >>> additional presentation for IETF 101. Additionally, you're going to need to 
>     >>> present it in TEAS anyway due to their mandate...
>     >>>
>     >>> Thanks,
>     >>> Acee
>     >>>
>     >>> ???On 3/6/18, 4:56 PM, "Lsr on behalf of Toerless Eckert" 
>     >>> <lsr-bounces@ietf.org on behalf of tte@cs.fau.de> wrote:
>     >>>
>     >>>     Dear LSR WG chairs,
>     >>>
>     >>>     I am hereby requesting a slot for LSR WG @IETF101 to present subject draft.
>     >>>
>     >>>     At the core of the proposed framework for the control plane of BIER-TE is
>     >>>     a proposed topology model for BIER-TE to allow path calculation (and other
>     >>>     consistency calculation) - distributed through the IGPs.
>     >>>
>     >>>     I would like to get early feedback before we would start to work on the
>     >>>     actual encoding of this topology information into IGP LSA/LSP types.
>     >>>
>     >>>     Cheers
>     >>>         Toerless
>     >>>
>     >>>     _______________________________________________
>     >>>     Lsr mailing list
>     >>>     Lsr@ietf.org
>     >>>     https://www.ietf.org/mailman/listinfo/lsr
>     >>>
>     >
>     > _______________________________________________
>     > Lsr mailing list
>     > Lsr@ietf.org
>     > https://www.ietf.org/mailman/listinfo/lsr
>     >
>     
>     
>     _______________________________________________
>     Lsr mailing list
>     Lsr@ietf.org
>     https://www.ietf.org/mailman/listinfo/lsr
>     
> 
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

-- 
---
tte@cs.fau.de


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Ladislav Lhotka <lhotka@nic.cz>, YANG Doctors <yang-doctors@ietf.org>
CC: "draft-ietf-ospf-yang.all@ietf.org" <draft-ietf-ospf-yang.all@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Martin Bjorklund <mbj@tail-f.com>, Ladislav Lhotka <lhotka@nic.cz>
CC: YANG Doctors <yang-doctors@ietf.org>, "draft-ietf-ospf-yang.all@ietf.org" <draft-ietf-ospf-yang.all@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [yang-doctors] Yangdoctors last call review of draft-ietf-ospf-yang-09
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From nobody Wed Mar 14 00:30:45 2018
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To: acee@cisco.com
Cc: lhotka@nic.cz, yang-doctors@ietf.org, draft-ietf-ospf-yang.all@ietf.org, lsr@ietf.org
From: Martin Bjorklund <mbj@tail-f.com>
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Subject: Re: [Lsr] [yang-doctors] Yangdoctors last call review of draft-ietf-ospf-yang-09
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Hi,

"Acee Lindem (acee)" <acee@cisco.com> wrote:
> Hi Martin, 
> We believe that https://datatracker.ietf.org/doc/draft-ietf-ospf-yang/
> satisfies your comments. Please take a look.
> Thanks,
> Acee
>     
>     On 12/6/17, 6:46 AM, "Martin Bjorklund" <mbj@tail-f.com> wrote:
>     
>         Ladislav Lhotka <lhotka@nic.cz> wrote:
>         > Reviewer: Ladislav Lhotka
>         > Review result: Ready with Issues
>         > 
>         > The data model defined in this document is a massive piece of work:
>         > it
>         > consists of 11 YANG modules and defines around 1200 schema nodes. The
>         
>         11 YANG modules?  Isn't there just one?
>         
>         
>         I would like to add two quick comments to Lada's review.
>         
>         o  Remove all "revision" statements except the one that says "initial
>            revision".   The idea is to have one revision statement per
>            published version (i.e., RFC).

This is now addressed.


>         
>         o  Many of the nodes have quite rudimentary descriptions, and the
>            "reference" statement is rarely used.  For example:
>         
>                  leaf lsa-id {
>                    type yang:dotted-quad;
>                    mandatory true;
>                    description "LSA ID.";
>                  }
>         
>            It seems as the description is put there just to keep the tools
>            quiet.  I know that it is painful to write good descriptions, but
>            it does help the consumer of the data model.

I don't think this was addressed; many descriptions are still on this
form (including the lsa-id).  But if the authors and the WG believe
that this is clear to the reader this is fine.

Just a few additional comments:

o  In section 3, before the module, add:

   This module augments [I-D.ietf-netmod-rfc8022bis], imports a
   grouping from [I-D.ietf-bfd-yang], and references [RFC1765],
   [RFC4552], [RFC5082], [RFC5286], [RFC5329], [RFC5443], [RFC5631],
   [RFC5714], [RFC5880], [RFC5881], [RFC6021], [RFC6860], [RFC6987],
   [RFC7490], [RFC7684], [RFC7777], [RFC8291], and
   [I-D.ietf-rtgwg-backoff-algo].

  and add these documents to the references.

  NOTE: the list above is probably not complete, please ensure that
  all references in the YANG module are covered in this list, except
  the ones that are already present in the text body of the document
  (like RFC 8177).

  Also add RFC editor notes to the "RFC XXXX" strings you have that
  refer to current I-Ds (as opposed to the current document).


o  Remove the statement

     reference "RFC XXXX";

   on the top-level (before the revision statement).

   (The revision statement references this RFC).


o  I suggest you remove the "end comments" like:

      } // list link-scope-lsas

   It is not really clear why some end brackets have them and some do
   not.  Also they are not consistent, and sometimes don't match the
   "other end" (probably half of the ones I quickly checked were not
   correct).

   If you decide to keep them, please ensure that they are consistent
   and correct.




/martin


>         
>         
>         /martin
>         
>         
>         > "ietf-ospf@2017-10-30" module is compatible with the NMDA
>         > architecture.
>         > 
>         > **** Comments
>         > 
>         > 1. Unless there is a really compelling reason not to do so, the
>         >    "ietf-ospf" should declare YANG version 1.1. For one,
>         >    "ietf-routing" that is being augmented by "ietf-ospf" already
>         >    declares this version. Some of my suggestions below also assume
>         >    version 1.1.
>         > 
>         > 2. The "ietf-ospf" can work only with the new NMDA-compatible
>         >    revisions of some modules, such as "ietf-interfaces" and
>         >    "ietf-routing". I understand it is not desirable to import such
>         >    modules by revision, but at least it should be mentioned in a
>         >    description attached to every such import.
>         > 
>         > 3. Maybe the draft could mention that implementations should supply a
>         >    default routing domain as a system-controlled resource.
>         > 
>         > 4. In "when" expressions, the module uses literal strings for
>         >    identities. This is known to be problematic, the XPath functions
>         >    derived-from() or derived-from-or-self() should be used instead.
>         > 
>         > 5. Some enumerations, such as "packet-type" and "if-state-type"
>         >    define enum identifiers with uppercase letters and/or underscores,
>         >    for example "Database-Description" or "LONG_WAIT". RFC6087bis
>         >    recommends that only lowercase letters, numbers and dashes. I
>         >    think
>         >    this convention should be observed despite the fact that the
>         >    current names are traditionally used in OSPF specs. The
>         >    "ietf-routing" module also defines "router-id" even though the
>         >    documents use "Router ID".
>         > 
>         > 6. The types of LSA headers are modelled as integers. While OSPF
>         > gurus
>         >    probably know these numbers by heart, it is not very
>         >    reader-frienly. So at least some references to documents defining
>         >    these numbers should be provided, but my suggestion is to consider
>         >    implementing them with identities. It seems it might also be
>         >    useful
>         >    to define some "abstract" identities for these types. For example,
>         >    if "opaque-lsa" is defined, then the definition of container
>         >    "opaque" could simply use
>         > 
>         >      when "derived-from(../../header/type, 'ospf:opaque-lsa')";
>         > 
>         >    instead of
>         > 
>         >       when "../../header/type = 9 or "
>         >               + "../../header/type = 10 or "
>         >               + "../../header/type = 11";
>         > 
>         > 7. The title of sec. 2.9 should be "OSPF Notifications" rather than
>         >    "OSPF notification".
>         > 
>         > 
>         > _______________________________________________
>         > yang-doctors mailing list
>         > yang-doctors@ietf.org
>         > https://www.ietf.org/mailman/listinfo/yang-doctors
>         > 
>         
>     
>     
> 


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Subject: [Lsr] [Editorial Errata Reported] RFC5250 (5287)
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The following errata report has been submitted for RFC5250,
"The OSPF Opaque LSA Option".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5287

--------------------------------------
Type: Editorial
Reported by: Angelos Vassiliou <angelos.a.vassiliou@gmail.com>

Section: 7

Original Text
-------------
inter-area procedures described in Section 6 of this document.

Corrected Text
--------------
inter-area procedures described in Section 5 of this document.

Notes
-----
Inter-Area Considerations are discussed in Section 5, not Section 6.

Instructions:
-------------
This erratum is currently posted as "Reported". If necessary, please
use "Reply All" to discuss whether it should be verified or
rejected. When a decision is reached, the verifying party  
can log in to change the status and edit the report, if necessary. 

--------------------------------------
RFC5250 (draft-ietf-ospf-rfc2370bis-05)
--------------------------------------
Title               : The OSPF Opaque LSA Option
Publication Date    : July 2008
Author(s)           : L. Berger, I. Bryskin, A. Zinin, R. Coltun
Category            : PROPOSED STANDARD
Source              : Open Shortest Path First IGP
Area                : Routing
Stream              : IETF
Verifying Party     : IESG


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The following errata report has been rejected for RFC5309,
"Point-to-Point Operation over LAN in Link State Routing Protocols".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5007

--------------------------------------
Status: Rejected
Type: Technical

Reported by: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Date Reported: 2017-04-30
Rejected by: Alvaro Retana (IESG)

Section: 4.3

Original Text
-------------
For the ARP implementation (which checks that the subnet of the source 
address of the ARP request matches the local interface address), 
this check needs to be relaxed for the unnumbered p2p-over-lan circuits.

Corrected Text
--------------
For the ARP implementation (which checks that the subnet of the source 
address of the ARP request matches the local interface address), 
this check needs to be relaxed for the p2p-over-lan circuits 
(both numbered and unnumbered).

Notes
-----
Consider the following situation: 
1.	Two routers, R1 and R2, are connected by a physical P2P  Ethernet link
2.	OSPFv2 is enabled on the interfaces representing the endpoints of this link. 
3.      From the OSPF POV these interfaces:
o	Are configured as P2P
o	Belong to the same area
o	Are assigned with IP addresses and subnet masks yielding different subnets
4.    ARP check mentioned in the problematic text is not relaxed.

Under this conditions:
-Both R1 and R2 will accept Hello messages sent by the other router 
(becase it ignores subnet in Hello messages received via P2P interfaces)
- Adjacency between R1 and R2 will progress to FULL state (because all OSPFv2 messages 
will be sent with AllSPFRouters multicast IPv4 address)
- Unicast traffic sent by R1 to R2 (and vice versa) will be blackholed because ARP 
will not resolve addresses assigned to the corresponding interfaces.
 --VERIFIER NOTES-- 
RFC 5309 introduced the possibility of supporting an unnumbered configuration on a LAN. Statements in this RFC regarding ARP concerns are therefore deliberately limited to this new configuration.

For IS-IS, RFC 3787 Section 10 discusses concerns regarding mismatched subnets on numbered links.

For OSPF it is well known that there are some existing implementations which have supported mismatched subnets for many years.

Any concerns with ARP behavior  in support of mismatched subnets on numbered LANs is out of scope of RFC 5309.

[https://mailarchive.ietf.org/arch/msg/isis-wg/aCFWc8KuE8xEy0-qIrN63odct1o/?qid=623f2d68947e2ec849fb2e2a7f2e6242]

--------------------------------------
RFC5309 (draft-ietf-isis-igp-p2p-over-lan-06)
--------------------------------------
Title               : Point-to-Point Operation over LAN in Link State Routing Protocols
Publication Date    : October 2008
Author(s)           : N. Shen, Ed., A. Zinin, Ed.
Category            : INFORMATIONAL
Source              : IS-IS for IP Internets
Area                : Routing
Stream              : IETF
Verifying Party     : IESG


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Subject: [Lsr] [Errata Held for Document Update] RFC5250 (5287)
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The following errata report has been held for document update 
for RFC5250, "The OSPF Opaque LSA Option". 

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5287

--------------------------------------
Status: Held for Document Update
Type: Editorial

Reported by: Angelos Vassiliou <angelos.a.vassiliou@gmail.com>
Date Reported: 2018-03-14
Held by: Alvaro Retana (IESG)

Section: 7

Original Text
-------------
inter-area procedures described in Section 6 of this document.

Corrected Text
--------------
inter-area procedures described in Section 5 of this document.

Notes
-----
Inter-Area Considerations are discussed in Section 5, not Section 6.

--------------------------------------
RFC5250 (draft-ietf-ospf-rfc2370bis-05)
--------------------------------------
Title               : The OSPF Opaque LSA Option
Publication Date    : July 2008
Author(s)           : L. Berger, I. Bryskin, A. Zinin, R. Coltun
Category            : PROPOSED STANDARD
Source              : Open Shortest Path First IGP
Area                : Routing
Stream              : IETF
Verifying Party     : IESG


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From: Rob Shakir <rjs@rob.sh>
Date: Mon, 19 Mar 2018 09:22:13 +0000
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To: "Acee Lindem (acee)" <acee@cisco.com>
Cc: Martin Bjorklund <mbj@tail-f.com>, "lsr@ietf.org" <lsr@ietf.org>,  "yang-doctors@ietf.org" <yang-doctors@ietf.org>, "lhotka@nic.cz" <lhotka@nic.cz>,  "draft-ietf-ospf-yang.all@ietf.org" <draft-ietf-ospf-yang.all@ietf.org>
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Subject: Re: [Lsr] [yang-doctors] Yangdoctors last call review of draft-ietf-ospf-yang-09
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Hi Acee,

For the descriptions, there are tools that use these to build documentation
automatically for a YANG model. We have found that such documentation is
particularly useful for engineers that are actually consuming the models to
generate config.

Going forward, if we expect YANG modelled data to be the way that we
interact with network elements, then such generated documentation is likely
to replace a bunch of CLI manuals, so it is worth ensuring the descriptions
are useful in such a context IMHO.

Just my $0.02,
r.
On Fri, Mar 16, 2018 at 17:31 Acee Lindem (acee) <acee@cisco.com> wrote:

> Hi Martin,
>
> =EF=BB=BFOn 3/14/18, 3:30 AM, "Martin Bjorklund" <mbj@tail-f.com> wrote:
>
>     Hi,
>
>     "Acee Lindem (acee)" <acee@cisco.com> wrote:
>     > Hi Martin,
>     > We believe that
> https://datatracker.ietf.org/doc/draft-ietf-ospf-yang/
>     > satisfies your comments. Please take a look.
>     > Thanks,
>     > Acee
>     >
>     >     On 12/6/17, 6:46 AM, "Martin Bjorklund" <mbj@tail-f.com> wrote:
>     >
>     >         Ladislav Lhotka <lhotka@nic.cz> wrote:
>     >         > Reviewer: Ladislav Lhotka
>     >         > Review result: Ready with Issues
>     >         >
>     >         > The data model defined in this document is a massive piec=
e
> of work:
>     >         > it
>     >         > consists of 11 YANG modules and defines around 1200 schem=
a
> nodes. The
>     >
>     >         11 YANG modules?  Isn't there just one?
>     >
>     >
>     >         I would like to add two quick comments to Lada's review.
>     >
>     >         o  Remove all "revision" statements except the one that say=
s
> "initial
>     >            revision".   The idea is to have one revision statement
> per
>     >            published version (i.e., RFC).
>
>     This is now addressed.
>
>
>     >
>     >         o  Many of the nodes have quite rudimentary descriptions,
> and the
>     >            "reference" statement is rarely used.  For example:
>     >
>     >                  leaf lsa-id {
>     >                    type yang:dotted-quad;
>     >                    mandatory true;
>     >                    description "LSA ID.";
>     >                  }
>     >
>     >            It seems as the description is put there just to keep th=
e
> tools
>     >            quiet.  I know that it is painful to write good
> descriptions, but
>     >            it does help the consumer of the data model.
>
>     I don't think this was addressed; many descriptions are still on this
>     form (including the lsa-id).  But if the authors and the WG believe
>     that this is clear to the reader this is fine.
>
> Note that I did beef up the descriptions and references for a number of
> data leaves. This is a pretty fundamental concept in OSPF and one could
> argument that someone who doesn=E2=80=99t understand it won't benefit fro=
m looking
> at the YANG model. However, we will expand the abbreviation in the first
> occurrence and indicate that LSAs are uniquely identified by the <lsa-typ=
e,
> lsa-id, adv-router> tuple in the various database description text.
>
>
>     Just a few additional comments:
>
>     o  In section 3, before the module, add:
>
>        This module augments [I-D.ietf-netmod-rfc8022bis], imports a
>        grouping from [I-D.ietf-bfd-yang], and references [RFC1765],
>        [RFC4552], [RFC5082], [RFC5286], [RFC5329], [RFC5443], [RFC5631],
>        [RFC5714], [RFC5880], [RFC5881], [RFC6021], [RFC6860], [RFC6987],
>        [RFC7490], [RFC7684], [RFC7777], [RFC8291], and
>        [I-D.ietf-rtgwg-backoff-algo].
>
>
>       and add these documents to the references.
>
>       NOTE: the list above is probably not complete, please ensure that
>       all references in the YANG module are covered in this list, except
>       the ones that are already present in the text body of the document
>       (like RFC 8177).
>
> Thanks - actually I knew about these many were a result of the above done
> right before the IETF cut-off. I was fully expecting a comment from Tom
> Petch by now... We'll make sure we add all these in the next revision.
>
>
>       Also add RFC editor notes to the "RFC XXXX" strings you have that
>       refer to current I-Ds (as opposed to the current document).
>
> Right - a few of these are in the AUTH48 hours and will be updated to the
> actual numbers in the next revision.
>
>
>     o  Remove the statement
>
>          reference "RFC XXXX";
>
>        on the top-level (before the revision statement).
>
>        (The revision statement references this RFC).
>
> Sure.
>
>
>     o  I suggest you remove the "end comments" like:
>
>           } // list link-scope-lsas
>
>        It is not really clear why some end brackets have them and some do
>        not.  Also they are not consistent, and sometimes don't match the
>        "other end" (probably half of the ones I quickly checked were not
>        correct).
>
>        If you decide to keep them, please ensure that they are consistent
>        and correct.
>
> I agree - let me discuss with my co-authors.
>
> Thanks,
> Acee
>
>
>
>
>
>     /martin
>
>
>     >
>     >
>     >         /martin
>     >
>     >
>     >         > "ietf-ospf@2017-10-30" module is compatible with the NMDA
>     >         > architecture.
>     >         >
>     >         > **** Comments
>     >         >
>     >         > 1. Unless there is a really compelling reason not to do
> so, the
>     >         >    "ietf-ospf" should declare YANG version 1.1. For one,
>     >         >    "ietf-routing" that is being augmented by "ietf-ospf"
> already
>     >         >    declares this version. Some of my suggestions below
> also assume
>     >         >    version 1.1.
>     >         >
>     >         > 2. The "ietf-ospf" can work only with the new
> NMDA-compatible
>     >         >    revisions of some modules, such as "ietf-interfaces" a=
nd
>     >         >    "ietf-routing". I understand it is not desirable to
> import such
>     >         >    modules by revision, but at least it should be
> mentioned in a
>     >         >    description attached to every such import.
>     >         >
>     >         > 3. Maybe the draft could mention that implementations
> should supply a
>     >         >    default routing domain as a system-controlled resource=
.
>     >         >
>     >         > 4. In "when" expressions, the module uses literal strings
> for
>     >         >    identities. This is known to be problematic, the XPath
> functions
>     >         >    derived-from() or derived-from-or-self() should be use=
d
> instead.
>     >         >
>     >         > 5. Some enumerations, such as "packet-type" and
> "if-state-type"
>     >         >    define enum identifiers with uppercase letters and/or
> underscores,
>     >         >    for example "Database-Description" or "LONG_WAIT".
> RFC6087bis
>     >         >    recommends that only lowercase letters, numbers and
> dashes. I
>     >         >    think
>     >         >    this convention should be observed despite the fact
> that the
>     >         >    current names are traditionally used in OSPF specs. Th=
e
>     >         >    "ietf-routing" module also defines "router-id" even
> though the
>     >         >    documents use "Router ID".
>     >         >
>     >         > 6. The types of LSA headers are modelled as integers.
> While OSPF
>     >         > gurus
>     >         >    probably know these numbers by heart, it is not very
>     >         >    reader-frienly. So at least some references to
> documents defining
>     >         >    these numbers should be provided, but my suggestion is
> to consider
>     >         >    implementing them with identities. It seems it might
> also be
>     >         >    useful
>     >         >    to define some "abstract" identities for these types.
> For example,
>     >         >    if "opaque-lsa" is defined, then the definition of
> container
>     >         >    "opaque" could simply use
>     >         >
>     >         >      when "derived-from(../../header/type,
> 'ospf:opaque-lsa')";
>     >         >
>     >         >    instead of
>     >         >
>     >         >       when "../../header/type =3D 9 or "
>     >         >               + "../../header/type =3D 10 or "
>     >         >               + "../../header/type =3D 11";
>     >         >
>     >         > 7. The title of sec. 2.9 should be "OSPF Notifications"
> rather than
>     >         >    "OSPF notification".
>     >         >
>     >         >
>     >         > _______________________________________________
>     >         > yang-doctors mailing list
>     >         > yang-doctors@ietf.org
>     >         > https://www.ietf.org/mailman/listinfo/yang-doctors
>     >         >
>     >
>     >
>     >
>     >
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

--000000000000ef61260567c07eb2
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

Hi Acee,<br><br>For the descriptions, there are tools that use these to bui=
ld documentation automatically for a YANG model. We have found that such do=
cumentation is particularly useful for engineers that are actually consumin=
g the models to generate config. <br><br>Going forward, if we expect YANG m=
odelled data to be the way that we interact with network elements, then suc=
h generated documentation is likely to replace a bunch of CLI manuals, so i=
t is worth ensuring the descriptions are useful in such a context IMHO. <br=
><br>Just my $0.02,<br>r. <br><div class=3D"gmail_quote"><div dir=3D"ltr">O=
n Fri, Mar 16, 2018 at 17:31 Acee Lindem (acee) &lt;<a href=3D"mailto:acee@=
cisco.com">acee@cisco.com</a>&gt; wrote:<br></div><blockquote class=3D"gmai=
l_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left=
:1ex">Hi Martin,<br>
<br>
=EF=BB=BFOn 3/14/18, 3:30 AM, &quot;Martin Bjorklund&quot; &lt;<a href=3D"m=
ailto:mbj@tail-f.com" target=3D"_blank">mbj@tail-f.com</a>&gt; wrote:<br>
<br>
=C2=A0 =C2=A0 Hi,<br>
<br>
=C2=A0 =C2=A0 &quot;Acee Lindem (acee)&quot; &lt;<a href=3D"mailto:acee@cis=
co.com" target=3D"_blank">acee@cisco.com</a>&gt; wrote:<br>
=C2=A0 =C2=A0 &gt; Hi Martin,<br>
=C2=A0 =C2=A0 &gt; We believe that <a href=3D"https://datatracker.ietf.org/=
doc/draft-ietf-ospf-yang/" rel=3D"noreferrer" target=3D"_blank">https://dat=
atracker.ietf.org/doc/draft-ietf-ospf-yang/</a><br>
=C2=A0 =C2=A0 &gt; satisfies your comments. Please take a look.<br>
=C2=A0 =C2=A0 &gt; Thanks,<br>
=C2=A0 =C2=A0 &gt; Acee<br>
=C2=A0 =C2=A0 &gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0On 12/6/17, 6:46 AM, &quot;Martin Bjo=
rklund&quot; &lt;<a href=3D"mailto:mbj@tail-f.com" target=3D"_blank">mbj@ta=
il-f.com</a>&gt; wrote:<br>
=C2=A0 =C2=A0 &gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ladislav Lhotka &lt;<a =
href=3D"mailto:lhotka@nic.cz" target=3D"_blank">lhotka@nic.cz</a>&gt; wrote=
:<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Reviewer: Ladislav=
 Lhotka<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Review result: Rea=
dy with Issues<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; The data model def=
ined in this document is a massive piece of work:<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; it<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; consists of 11 YAN=
G modules and defines around 1200 schema nodes. The<br>
=C2=A0 =C2=A0 &gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A011 YANG modules?=C2=A0 =
Isn&#39;t there just one?<br>
=C2=A0 =C2=A0 &gt;<br>
=C2=A0 =C2=A0 &gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I would like to add two=
 quick comments to Lada&#39;s review.<br>
=C2=A0 =C2=A0 &gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0o=C2=A0 Remove all &quo=
t;revision&quot; statements except the one that says &quot;initial<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 revision&quot;.=
=C2=A0 =C2=A0The idea is to have one revision statement per<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 published versi=
on (i.e., RFC).<br>
<br>
=C2=A0 =C2=A0 This is now addressed.<br>
<br>
<br>
=C2=A0 =C2=A0 &gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0o=C2=A0 Many of the nod=
es have quite rudimentary descriptions, and the<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 &quot;reference=
&quot; statement is rarely used.=C2=A0 For example:<br>
=C2=A0 =C2=A0 &gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 leaf lsa-id {<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 type yang:dotted-quad;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 mandatory true;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 description &quot;LSA ID.&quot;;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 }<br>
=C2=A0 =C2=A0 &gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 It seems as the=
 description is put there just to keep the tools<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 quiet.=C2=A0 I =
know that it is painful to write good descriptions, but<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 it does help th=
e consumer of the data model.<br>
<br>
=C2=A0 =C2=A0 I don&#39;t think this was addressed; many descriptions are s=
till on this<br>
=C2=A0 =C2=A0 form (including the lsa-id).=C2=A0 But if the authors and the=
 WG believe<br>
=C2=A0 =C2=A0 that this is clear to the reader this is fine.<br>
<br>
Note that I did beef up the descriptions and references for a number of dat=
a leaves. This is a pretty fundamental concept in OSPF and one could argume=
nt that someone who doesn=E2=80=99t understand it won&#39;t benefit from lo=
oking at the YANG model. However, we will expand the abbreviation in the fi=
rst occurrence and indicate that LSAs are uniquely identified by the &lt;ls=
a-type, lsa-id, adv-router&gt; tuple in the various database description te=
xt.<br>
<br>
<br>
=C2=A0 =C2=A0 Just a few additional comments:<br>
<br>
=C2=A0 =C2=A0 o=C2=A0 In section 3, before the module, add:<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0This module augments [I-D.ietf-netmod-rfc8022bis=
], imports a<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0grouping from [I-D.ietf-bfd-yang], and reference=
s [RFC1765],<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0[RFC4552], [RFC5082], [RFC5286], [RFC5329], [RFC=
5443], [RFC5631],<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0[RFC5714], [RFC5880], [RFC5881], [RFC6021], [RFC=
6860], [RFC6987],<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0[RFC7490], [RFC7684], [RFC7777], [RFC8291], and<=
br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0[I-D.ietf-rtgwg-backoff-algo].<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 and add these documents to the references.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 NOTE: the list above is probably not complete, please =
ensure that<br>
=C2=A0 =C2=A0 =C2=A0 all references in the YANG module are covered in this =
list, except<br>
=C2=A0 =C2=A0 =C2=A0 the ones that are already present in the text body of =
the document<br>
=C2=A0 =C2=A0 =C2=A0 (like RFC 8177).<br>
<br>
Thanks - actually I knew about these many were a result of the above done r=
ight before the IETF cut-off. I was fully expecting a comment from Tom Petc=
h by now... We&#39;ll make sure we add all these in the next revision.<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 Also add RFC editor notes to the &quot;RFC XXXX&quot; =
strings you have that<br>
=C2=A0 =C2=A0 =C2=A0 refer to current I-Ds (as opposed to the current docum=
ent).<br>
<br>
Right - a few of these are in the AUTH48 hours and will be updated to the a=
ctual numbers in the next revision.<br>
<br>
<br>
=C2=A0 =C2=A0 o=C2=A0 Remove the statement<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0reference &quot;RFC XXXX&quot;;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0on the top-level (before the revision statement)=
.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0(The revision statement references this RFC).<br=
>
<br>
Sure.<br>
<br>
<br>
=C2=A0 =C2=A0 o=C2=A0 I suggest you remove the &quot;end comments&quot; lik=
e:<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 } // list link-scope-lsas<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0It is not really clear why some end brackets hav=
e them and some do<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0not.=C2=A0 Also they are not consistent, and som=
etimes don&#39;t match the<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0&quot;other end&quot; (probably half of the ones=
 I quickly checked were not<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0correct).<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0If you decide to keep them, please ensure that t=
hey are consistent<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0and correct.<br>
<br>
I agree - let me discuss with my co-authors.<br>
<br>
Thanks,<br>
Acee<br>
<br>
<br>
<br>
<br>
<br>
=C2=A0 =C2=A0 /martin<br>
<br>
<br>
=C2=A0 =C2=A0 &gt;<br>
=C2=A0 =C2=A0 &gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0/martin<br>
=C2=A0 =C2=A0 &gt;<br>
=C2=A0 =C2=A0 &gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &quot;ietf-ospf@20=
17-10-30&quot; module is compatible with the NMDA<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; architecture.<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; **** Comments<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; 1. Unless there is=
 a really compelling reason not to do so, the<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 &quot=
;ietf-ospf&quot; should declare YANG version 1.1. For one,<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 &quot=
;ietf-routing&quot; that is being augmented by &quot;ietf-ospf&quot; alread=
y<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 decla=
res this version. Some of my suggestions below also assume<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 versi=
on 1.1.<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; 2. The &quot;ietf-=
ospf&quot; can work only with the new NMDA-compatible<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 revis=
ions of some modules, such as &quot;ietf-interfaces&quot; and<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 &quot=
;ietf-routing&quot;. I understand it is not desirable to import such<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 modul=
es by revision, but at least it should be mentioned in a<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 descr=
iption attached to every such import.<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; 3. Maybe the draft=
 could mention that implementations should supply a<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 defau=
lt routing domain as a system-controlled resource.<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; 4. In &quot;when&q=
uot; expressions, the module uses literal strings for<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 ident=
ities. This is known to be problematic, the XPath functions<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 deriv=
ed-from() or derived-from-or-self() should be used instead.<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; 5. Some enumeratio=
ns, such as &quot;packet-type&quot; and &quot;if-state-type&quot;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 defin=
e enum identifiers with uppercase letters and/or underscores,<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 for e=
xample &quot;Database-Description&quot; or &quot;LONG_WAIT&quot;. RFC6087bi=
s<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 recom=
mends that only lowercase letters, numbers and dashes. I<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 think=
<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 this =
convention should be observed despite the fact that the<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 curre=
nt names are traditionally used in OSPF specs. The<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 &quot=
;ietf-routing&quot; module also defines &quot;router-id&quot; even though t=
he<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 docum=
ents use &quot;Router ID&quot;.<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; 6. The types of LS=
A headers are modelled as integers. While OSPF<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; gurus<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 proba=
bly know these numbers by heart, it is not very<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 reade=
r-frienly. So at least some references to documents defining<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 these=
 numbers should be provided, but my suggestion is to consider<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 imple=
menting them with identities. It seems it might also be<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 usefu=
l<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 to de=
fine some &quot;abstract&quot; identities for these types. For example,<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 if &q=
uot;opaque-lsa&quot; is defined, then the definition of container<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 &quot=
;opaque&quot; could simply use<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 =C2=
=A0 when &quot;derived-from(../../header/type, &#39;ospf:opaque-lsa&#39;)&q=
uot;;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 inste=
ad of<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 =C2=
=A0 =C2=A0when &quot;../../header/type =3D 9 or &quot;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+ &quot;../../header/type =3D 10 or &=
quot;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+ &quot;../../header/type =3D 11&quot=
;;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; 7. The title of se=
c. 2.9 should be &quot;OSPF Notifications&quot; rather than<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;=C2=A0 =C2=A0 &quot=
;OSPF notification&quot;.<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; __________________=
_____________________________<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; yang-doctors maili=
ng list<br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; <a href=3D"mailto:=
yang-doctors@ietf.org" target=3D"_blank">yang-doctors@ietf.org</a><br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; <a href=3D"https:/=
/www.ietf.org/mailman/listinfo/yang-doctors" rel=3D"noreferrer" target=3D"_=
blank">https://www.ietf.org/mailman/listinfo/yang-doctors</a><br>
=C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
=C2=A0 =C2=A0 &gt;<br>
=C2=A0 =C2=A0 &gt;<br>
=C2=A0 =C2=A0 &gt;<br>
=C2=A0 =C2=A0 &gt;<br>
<br>
<br>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Rob Shakir <rjs@rob.sh>
CC: Martin Bjorklund <mbj@tail-f.com>, "lsr@ietf.org" <lsr@ietf.org>, "yang-doctors@ietf.org" <yang-doctors@ietf.org>, "lhotka@nic.cz" <lhotka@nic.cz>, "draft-ietf-ospf-yang.all@ietf.org" <draft-ietf-ospf-yang.all@ietf.org>
Thread-Topic: [Lsr] [yang-doctors] Yangdoctors last call review of draft-ietf-ospf-yang-09
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--_000_8E26A32958A94D0C9194340FFB0080FFciscocom_--


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The following errata report has been submitted for RFC7810,
"IS-IS Traffic Engineering (TE) Metric Extensions".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5293

--------------------------------------
Type: Editorial
Reported by: Jeffrey Haas <jhaas@juniper.net>

Section: 4.5-4.7

Original Text
-------------
    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Type        |     Length    |  RESERVED     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                          Residual Bandwidth                   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   where:

   Type: 37

   Length: 4

   RESERVED: This field is reserved for future use

Corrected Text
--------------
    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Type        |     Length    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                          Residual Bandwidth                   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   where:

   Type: 37

   Length: 4



Notes
-----
In sections 4.5, 4.6 and 4.7, a RESERVED field is in the diagram and the text.  However, the length field of each of these TLVs is 4.  The RESERVED field is thus not present and should be removed in future editions of this document.

Instructions:
-------------
This erratum is currently posted as "Reported". If necessary, please
use "Reply All" to discuss whether it should be verified or
rejected. When a decision is reached, the verifying party  
can log in to change the status and edit the report, if necessary. 

--------------------------------------
RFC7810 (draft-ietf-isis-te-metric-extensions-11)
--------------------------------------
Title               : IS-IS Traffic Engineering (TE) Metric Extensions
Publication Date    : May 2016
Author(s)           : S. Previdi, Ed., S. Giacalone, D. Ward, J. Drake, Q. Wu
Category            : PROPOSED STANDARD
Source              : IS-IS for IP Internets
Area                : Routing
Stream              : IETF
Verifying Party     : IESG


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To: "Acee Lindem (acee)" <acee@cisco.com>, RFC Errata System <rfc-editor@rfc-editor.org>, "sprevidi@cisco.com" <sprevidi@cisco.com>, "spencer.giacalone@gmail.com" <spencer.giacalone@gmail.com>, "David Ward (wardd)" <wardd@cisco.com>, "jdrake@juniper.net" <jdrake@juniper.net>, "sunseawq@huawei.com" <sunseawq@huawei.com>, "akatlas@gmail.com" <akatlas@gmail.com>, "db3546@att.com" <db3546@att.com>, "aretana.ietf@gmail.com" <aretana.ietf@gmail.com>, "chopps@chopps.org" <chopps@chopps.org>, "hannes@gredler.at" <hannes@gredler.at>
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References: <20180322104541.4342BB810BC@rfc-editor.org> <FE08ED61-EA8E-4C7F-8C4B-B8E7B768F471@cisco.com>
From: Olivier Dugeon <olivier.dugeon@orange.com>
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Subject: Re: [Lsr] [Editorial Errata Reported] RFC7810 (5293)
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Hi Acee,

Within Open Source Free Range Routing project, https://frrouting.org, we 
simply skip this RESERVED byte and use standard TLV header of 4 bytes 
only like the other TE metric Extensions parameters.

Detail are here: 
https://github.com/FRRouting/frr/blob/master/isisd/isis_te.h lines 216 
to 221

So, this errata is fine for me. Adding extra byte will add extra code as 
this TLV becomes not standard regarding the other ones.

Regards,

Olivier


Le 22/03/2018 à 11:20, Acee Lindem (acee) a écrit :
> Hi Jeff, et al,
>
> Speaking as a WG member:
>
> I agree there should be an Errata here but the interpretation taken by at least one implementation is to update the length to 5 rather than remove the RESERVED octet. I'd like to hear what other implementations have done.
>
> Thanks,
> Acee
>
> ﻿On 3/22/18, 6:49 AM, "Lsr on behalf of RFC Errata System" <lsr-bounces@ietf.org on behalf of rfc-editor@rfc-editor.org> wrote:
>
>      The following errata report has been submitted for RFC7810,
>      "IS-IS Traffic Engineering (TE) Metric Extensions".
>      
>      --------------------------------------
>      You may review the report below and at:
>      http://www.rfc-editor.org/errata/eid5293
>      
>      --------------------------------------
>      Type: Editorial
>      Reported by: Jeffrey Haas <jhaas@juniper.net>
>      
>      Section: 4.5-4.7
>      
>      Original Text
>      -------------
>          0                   1                   2                   3
>          0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>         |   Type        |     Length    |  RESERVED     |
>         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>         |                          Residual Bandwidth                   |
>         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>      
>         where:
>      
>         Type: 37
>      
>         Length: 4
>      
>         RESERVED: This field is reserved for future use
>      
>      Corrected Text
>      --------------
>          0                   1                   2                   3
>          0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>         |   Type        |     Length    |
>         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>         |                          Residual Bandwidth                   |
>         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>      
>         where:
>      
>         Type: 37
>      
>         Length: 4
>      
>      
>      
>      Notes
>      -----
>      In sections 4.5, 4.6 and 4.7, a RESERVED field is in the diagram and the text.  However, the length field of each of these TLVs is 4.  The RESERVED field is thus not present and should be removed in future editions of this document.
>      
>      Instructions:
>      -------------
>      This erratum is currently posted as "Reported". If necessary, please
>      use "Reply All" to discuss whether it should be verified or
>      rejected. When a decision is reached, the verifying party
>      can log in to change the status and edit the report, if necessary.
>      
>      --------------------------------------
>      RFC7810 (draft-ietf-isis-te-metric-extensions-11)
>      --------------------------------------
>      Title               : IS-IS Traffic Engineering (TE) Metric Extensions
>      Publication Date    : May 2016
>      Author(s)           : S. Previdi, Ed., S. Giacalone, D. Ward, J. Drake, Q. Wu
>      Category            : PROPOSED STANDARD
>      Source              : IS-IS for IP Internets
>      Area                : Routing
>      Stream              : IETF
>      Verifying Party     : IESG
>      
>      _______________________________________________
>      Lsr mailing list
>      Lsr@ietf.org
>      https://www.ietf.org/mailman/listinfo/lsr
>      
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

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Olivier Dugeon
Senior research engineer in QoS and network control
Open Source Referent
Orange/IMT/OLN/WTC/IEE/OPEN

fixe : +33 2 96 07 28 80
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--------------396EBEA8F721A8A3591481C6
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--------------0EF65960E4DC3289E0B5D461
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Content-Transfer-Encoding: 8bit

<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    <p>Hi Acee,</p>
    <p>Within Open Source Free Range Routing project, <a
        href="https://frrouting.org" moz-do-not-send="true">https://frrouting.org</a>,
      we simply skip this RESERVED byte and use standard TLV header of 4
      bytes only like the other TE metric Extensions parameters.</p>
    <p>Detail are here: <a moz-do-not-send="true"
        href="https://github.com/FRRouting/frr/blob/master/isisd/isis_te.h">https://github.com/FRRouting/frr/blob/master/isisd/isis_te.h</a>
      lines 216 to 221</p>
    <p>So, this errata is fine for me. Adding extra byte will add extra
      code as this TLV becomes not standard regarding the other ones.<br>
    </p>
    <p>Regards,</p>
    <p>Olivier<br>
    </p>
    <br>
    <div class="moz-cite-prefix">Le 22/03/2018 à 11:20, Acee Lindem
      (acee) a écrit :<br>
    </div>
    <blockquote type="cite"
      cite="mid:FE08ED61-EA8E-4C7F-8C4B-B8E7B768F471@cisco.com">
      <pre wrap="">Hi Jeff, et al, 

Speaking as a WG member: 

I agree there should be an Errata here but the interpretation taken by at least one implementation is to update the length to 5 rather than remove the RESERVED octet. I'd like to hear what other implementations have done. 

Thanks,
Acee 

﻿On 3/22/18, 6:49 AM, "Lsr on behalf of RFC Errata System" <a class="moz-txt-link-rfc2396E" href="mailto:lsr-bounces@ietf.orgonbehalfofrfc-editor@rfc-editor.org">&lt;lsr-bounces@ietf.org on behalf of rfc-editor@rfc-editor.org&gt;</a> wrote:

    The following errata report has been submitted for RFC7810,
    "IS-IS Traffic Engineering (TE) Metric Extensions".
    
    --------------------------------------
    You may review the report below and at:
    <a class="moz-txt-link-freetext" href="http://www.rfc-editor.org/errata/eid5293">http://www.rfc-editor.org/errata/eid5293</a>
    
    --------------------------------------
    Type: Editorial
    Reported by: Jeffrey Haas <a class="moz-txt-link-rfc2396E" href="mailto:jhaas@juniper.net">&lt;jhaas@juniper.net&gt;</a>
    
    Section: 4.5-4.7
    
    Original Text
    -------------
        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   Type        |     Length    |  RESERVED     |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                          Residual Bandwidth                   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    
       where:
    
       Type: 37
    
       Length: 4
    
       RESERVED: This field is reserved for future use
    
    Corrected Text
    --------------
        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   Type        |     Length    |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                          Residual Bandwidth                   |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    
       where:
    
       Type: 37
    
       Length: 4
    
    
    
    Notes
    -----
    In sections 4.5, 4.6 and 4.7, a RESERVED field is in the diagram and the text.  However, the length field of each of these TLVs is 4.  The RESERVED field is thus not present and should be removed in future editions of this document.
    
    Instructions:
    -------------
    This erratum is currently posted as "Reported". If necessary, please
    use "Reply All" to discuss whether it should be verified or
    rejected. When a decision is reached, the verifying party  
    can log in to change the status and edit the report, if necessary. 
    
    --------------------------------------
    RFC7810 (draft-ietf-isis-te-metric-extensions-11)
    --------------------------------------
    Title               : IS-IS Traffic Engineering (TE) Metric Extensions
    Publication Date    : May 2016
    Author(s)           : S. Previdi, Ed., S. Giacalone, D. Ward, J. Drake, Q. Wu
    Category            : PROPOSED STANDARD
    Source              : IS-IS for IP Internets
    Area                : Routing
    Stream              : IETF
    Verifying Party     : IESG
    
    _______________________________________________
    Lsr mailing list
    <a class="moz-txt-link-abbreviated" href="mailto:Lsr@ietf.org">Lsr@ietf.org</a>
    <a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/lsr">https://www.ietf.org/mailman/listinfo/lsr</a>
    

_______________________________________________
Lsr mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Lsr@ietf.org">Lsr@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/lsr">https://www.ietf.org/mailman/listinfo/lsr</a>
</pre>
    </blockquote>
    <br>
    <div class="moz-signature">-- <br>
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      <p style="line-height:20px;margin:0px"> </p>
      <span style="font-weight:bold;font-family:Arial,
        sans-serif;font-size:10pt;color:#000000;"> Olivier Dugeon </span>
      <br>
      <span style="font-family:Arial,
        sans-serif;font-size:10pt;color:#000000;"> Senior research
        engineer in QoS and network control<br>
        Open Source Referent</span> <br>
      <span style="font-family:Arial,
        sans-serif;font-size:10pt;color:#000000;">
        Orange/IMT/OLN/WTC/IEE/OPEN </span>
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      <span style="font-family:Arial,
        sans-serif;font-size:10pt;color:#000000"> fixe : +33 2 96 07 28
        80 </span> <br>
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From: Jeff Haas <jhaas@juniper.net>
To: "Acee Lindem (acee)" <acee@cisco.com>
CC: RFC Errata System <rfc-editor@rfc-editor.org>, "sprevidi@cisco.com" <sprevidi@cisco.com>, "spencer.giacalone@gmail.com" <spencer.giacalone@gmail.com>, David Ward <wardd@cisco.com>, John E Drake <jdrake@juniper.net>, "sunseawq@huawei.com" <sunseawq@huawei.com>, "akatlas@gmail.com" <akatlas@gmail.com>, "db3546@att.com" <db3546@att.com>, "aretana.ietf@gmail.com" <aretana.ietf@gmail.com>, "chopps@chopps.org" <chopps@chopps.org>, "hannes@gredler.at" <hannes@gredler.at>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] [Editorial Errata Reported] RFC7810 (5293)
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Jeff Haas <jhaas@juniper.net>
CC: RFC Errata System <rfc-editor@rfc-editor.org>, "sprevidi@cisco.com" <sprevidi@cisco.com>, "spencer.giacalone@gmail.com" <spencer.giacalone@gmail.com>, John E Drake <jdrake@juniper.net>, "akatlas@gmail.com" <akatlas@gmail.com>, "db3546@att.com" <db3546@att.com>, "aretana.ietf@gmail.com" <aretana.ietf@gmail.com>, "lsr@ietf.org" <lsr@ietf.org>, Olivier Dugeon <olivier.dugeon@orange.com>
Thread-Topic: [Lsr] [Editorial Errata Reported] RFC7810 (5293)
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Date: Thu, 22 Mar 2018 14:53:22 +0000
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Subject: Re: [Lsr] [Editorial Errata Reported] RFC7810 (5293)
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, Jeff Haas <jhaas@juniper.net>
CC: "spencer.giacalone@gmail.com" <spencer.giacalone@gmail.com>, "Olivier Dugeon" <olivier.dugeon@orange.com>, "db3546@att.com" <db3546@att.com>, "John E Drake" <jdrake@juniper.net>, "akatlas@gmail.com" <akatlas@gmail.com>, "sprevidi@cisco.com" <sprevidi@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, "aretana.ietf@gmail.com" <aretana.ietf@gmail.com>, RFC Errata System <rfc-editor@rfc-editor.org>
Thread-Topic: [Lsr] [Editorial Errata Reported] RFC7810 (5293)
Thread-Index: AQHTwctt74IERkZax0i6of7ixzvFRqPcb+iAgAArJoCAABA4AIAApdBQ
Date: Fri, 23 Mar 2018 05:54:20 +0000
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Subject: Re: [Lsr] [Editorial Errata Reported] RFC7810 (5293)
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Subject: Re: [Lsr] Comments on draft-ymbk-lsvr-lsoe-00
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Dear Authors,

Let me just ask one little question ....

It seems that ISIS protocol already meets a "Link State Over Ethernet"
definition so why to invent anything new here ?

If you don't like flooding properties of ISIS just disable it. Do not
flood. Do not run SPF in ISIS. Use ISIS only for p2p discovery.

You get for free out of the box all what you are trying to describe in the
subject document. Integrating open source ISIS code just for discovery (ie.
not worring about optimizations of flooding, back-off, timers, spf etc ...)
will be IMO much faster even using any apache license existing
implementation of ISIS.

Last - as Toerless already indicated - solving inevitable inconsistencies
of running LSOE, CDP & LLDP between various devices or in parallel on the
same links is something that should be addressed from day one. Unless you
assume that if someone is to use LSVR is will also have LSOE and any other
alternative discovery mechanisms will be disabled.

Best,
RR.

--001a114b14a4f800ce05682667a7
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Dear Authors,</div><div class=3D"gmail_=
default" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><=
br></div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,=
sans-serif;font-size:small">Let me just ask one little question ....=C2=A0<=
/div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans=
-serif;font-size:small"><br></div><div class=3D"gmail_default"><font face=
=3D"arial, helvetica, sans-serif">It seems that ISIS protocol already meets=
 a &quot;Link State Over Ethernet&quot; definition so why to invent anythin=
g new here ?</font><br></div><div class=3D"gmail_default"><font face=3D"ari=
al, helvetica, sans-serif"><br></font></div><div class=3D"gmail_default"><f=
ont face=3D"arial, helvetica, sans-serif">If you don&#39;t like flooding pr=
operties=C2=A0of ISIS just disable it. Do not flood. Do not run SPF in ISIS=
. Use ISIS only for p2p discovery.=C2=A0</font></div><div class=3D"gmail_de=
fault"><font face=3D"arial, helvetica, sans-serif"><br></font></div><div cl=
ass=3D"gmail_default"><font face=3D"arial, helvetica, sans-serif">You get f=
or free out of the box all what you are trying to describe in the subject d=
ocument. Integrating open source ISIS code just for discovery (ie. not worr=
ing about optimizations=C2=A0of flooding, back-off, timers, spf etc ...) wi=
ll be IMO much faster even using any apache license existing implementation=
 of ISIS.</font></div><div class=3D"gmail_default"><font face=3D"arial, hel=
vetica, sans-serif"><br></font></div><div class=3D"gmail_default"><font fac=
e=3D"arial, helvetica, sans-serif">Last - as Toerless already indicated - s=
olving inevitable inconsistencies of running LSOE, CDP &amp; LLDP between v=
arious devices or in parallel on the same links is something that should be=
 addressed from day one. Unless you assume that if someone is to use LSVR i=
s will also have LSOE and any other alternative discovery mechanisms will b=
e disabled.</font></div><div class=3D"gmail_default"><font face=3D"arial, h=
elvetica, sans-serif"><br></font></div><div class=3D"gmail_default"><font f=
ace=3D"arial, helvetica, sans-serif">Best,</font></div><div class=3D"gmail_=
default"><font face=3D"arial, helvetica, sans-serif">RR.</font></div><div c=
lass=3D"gmail_default"><br></div></div>

--001a114b14a4f800ce05682667a7--


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From: Donald Eastlake <d3e3e3@gmail.com>
Date: Sun, 25 Mar 2018 22:09:15 -0400
Message-ID: <CAF4+nEFutvXxVVpp+=Gmue6DTk0JHT74OvjGQs5Vy_aps7ANsw@mail.gmail.com>
To: Randy Bush <randy@psg.com>, lsr@ietf.org
Cc: RTGWG <rtgwg@ietf.org>, Keyur Patel <keyur@arrcus.com>, Robert Raszuk <robert@raszuk.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/t-ulnzpZxU4-WzzJNfuCJE5J-QI>
Subject: Re: [Lsr] Comments on draft-ymbk-lsvr-lsoe-00
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Hi,

On Sat, Mar 24, 2018 at 6:57 AM, Robert Raszuk <robert@raszuk.net> wrote:
> Dear Authors,
>
> Let me just ask one little question ....
>
> It seems that ISIS protocol already meets a "Link State Over Ethernet"
> definition so why to invent anything new here ?

My thought also.

> If you don't like flooding properties of ISIS just disable it. Do not flood.
> Do not run SPF in ISIS.. Use ISIS only for p2p discovery.

IS-IS now explicitly supports link-scoped "flooding" as per RFC 7356
"IS-IS Flooding Scope Link State PDUs (LSPs)". It also support 16-bit
TLV lengths. See in particular Extended Level 1 Circuit Scope (E-L1CS)
in RFC 7356.

> You get for free out of the box all what you are trying to describe in the
> subject document. Integrating open source ISIS code just for discovery (ie.
> not worring about optimizations of flooding, back-off, timers, spf etc ...)
> will be IMO much faster even using any apache license existing
> implementation of ISIS.

And authentication (RFC 5310).

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

> Last - as Toerless already indicated - solving inevitable inconsistencies of
> running LSOE, CDP & LLDP between various devices or in parallel on the same
> links is something that should be addressed from day one. Unless you assume
> that if someone is to use LSVR is will also have LSOE and any other
> alternative discovery mechanisms will be disabled.
>
> Best,
> RR.
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>


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Subject: [Lsr] Fwd: New Version Notification for draft-li-dynamic-flooding-04.txt
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--Apple-Mail=_558ED581-CFAA-4D9F-A7EE-95AAA208AA14
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Hi all,

I=E2=80=99ve submitted an updated version of my draft.  Several changes:

- This collapses the two documents into one, so IS-IS is now included.  =
Placeholders are there for OSPF.
- I=E2=80=99ve expanded the discussion of failure modes.
- Minor bug fixes.

Your comments are solicited=E2=80=A6

Tony


> Begin forwarded message:
>=20
> From: internet-drafts@ietf.org
> Subject: New Version Notification for draft-li-dynamic-flooding-04.txt
> Date: March 27, 2018 at 9:01:30 AM PDT
> To: "Tony Li" <tony.li@tony.li>
>=20
>=20
> A new version of I-D, draft-li-dynamic-flooding-04.txt
> has been successfully submitted by Tony Li and posted to the
> IETF repository.
>=20
> Name:		draft-li-dynamic-flooding
> Revision:	04
> Title:		Dynamic Flooding on Dense Graphs
> Document date:	2018-03-26
> Group:		Individual Submission
> Pages:		17
> URL:            =
https://www.ietf.org/internet-drafts/draft-li-dynamic-flooding-04.txt
> Status:         =
https://datatracker.ietf.org/doc/draft-li-dynamic-flooding/
> Htmlized:       =
https://tools.ietf.org/html/draft-li-dynamic-flooding-04
> Htmlized:       =
https://datatracker.ietf.org/doc/html/draft-li-dynamic-flooding
> Diff:           =
https://www.ietf.org/rfcdiff?url2=3Ddraft-li-dynamic-flooding-04
>=20
> Abstract:
>   Routing with link state protocols in dense network topologies can
>   result in sub-optimal convergence times due to the overhead
>   associated with flooding.  This can be addressed by decreasing the
>   flooding topology so that it is less dense.
>=20
>   This document discusses the problem in some depth and an
>   architectural solution.  Specific protocol changes for IS-IS, =
OSPFv2,
>   and OSPFv3 are described in this document.
>=20
>=20
>=20
>=20
> 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.
>=20
> The IETF Secretariat
>=20


--Apple-Mail=_558ED581-CFAA-4D9F-A7EE-95AAA208AA14
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><div =
class=3D""><br class=3D""></div>Hi all,<div class=3D""><br =
class=3D""></div><div class=3D"">I=E2=80=99ve submitted an updated =
version of my draft. &nbsp;Several changes:</div><div class=3D""><br =
class=3D""></div><div class=3D"">- This collapses the two documents into =
one, so IS-IS is now included. &nbsp;Placeholders are there for =
OSPF.</div><div class=3D"">- I=E2=80=99ve expanded the discussion of =
failure modes.</div><div class=3D"">- Minor bug fixes.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Your comments are =
solicited=E2=80=A6</div><div class=3D""><br class=3D""></div><div =
class=3D"">Tony</div><div class=3D""><br class=3D""></div><div =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">Begin forwarded message:</div><br =
class=3D"Apple-interchange-newline"><div style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=3D""><span=
 style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">From: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D""><a =
href=3D"mailto:internet-drafts@ietf.org" =
class=3D"">internet-drafts@ietf.org</a><br class=3D""></span></div><div =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px;" class=3D""><span style=3D"font-family: =
-webkit-system-font, Helvetica Neue, Helvetica, sans-serif; =
color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Subject: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D""><b class=3D"">New Version =
Notification for draft-li-dynamic-flooding-04.txt</b><br =
class=3D""></span></div><div style=3D"margin-top: 0px; margin-right: =
0px; margin-bottom: 0px; margin-left: 0px;" class=3D""><span =
style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Date: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D"">March 27, 2018 at 9:01:30 AM =
PDT<br class=3D""></span></div><div style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=3D""><span=
 style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">To: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D"">"Tony Li" &lt;<a =
href=3D"mailto:tony.li@tony.li" class=3D"">tony.li@tony.li</a>&gt;<br =
class=3D""></span></div><br class=3D""><div class=3D""><div class=3D""><br=
 class=3D"">A new version of I-D, draft-li-dynamic-flooding-04.txt<br =
class=3D"">has been successfully submitted by Tony Li and posted to =
the<br class=3D"">IETF repository.<br class=3D""><br class=3D"">Name:<span=
 class=3D"Apple-tab-span" style=3D"white-space:pre">	</span><span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>draft-li-dynamic-flooding<br class=3D"">Revision:<span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	</span>04<br =
class=3D"">Title:<span class=3D"Apple-tab-span" style=3D"white-space:pre">=
	</span><span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>Dynamic Flooding on Dense Graphs<br class=3D"">Document =
date:<span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>2018-03-26<br class=3D"">Group:<span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span><span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span>Individual Submission<br =
class=3D"">Pages:<span class=3D"Apple-tab-span" style=3D"white-space:pre">=
	</span><span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>17<br class=3D"">URL: =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://www.ietf.org/internet-drafts/draft-li-dynamic-flooding-04.=
txt" =
class=3D"">https://www.ietf.org/internet-drafts/draft-li-dynamic-flooding-=
04.txt</a><br class=3D"">Status: =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://datatracker.ietf.org/doc/draft-li-dynamic-flooding/" =
class=3D"">https://datatracker.ietf.org/doc/draft-li-dynamic-flooding/</a>=
<br class=3D"">Htmlized: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://tools.ietf.org/html/draft-li-dynamic-flooding-04" =
class=3D"">https://tools.ietf.org/html/draft-li-dynamic-flooding-04</a><br=
 class=3D"">Htmlized: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://datatracker.ietf.org/doc/html/draft-li-dynamic-flooding" =
class=3D"">https://datatracker.ietf.org/doc/html/draft-li-dynamic-flooding=
</a><br class=3D"">Diff: =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-li-dynamic-flooding-04" =
class=3D"">https://www.ietf.org/rfcdiff?url2=3Ddraft-li-dynamic-flooding-0=
4</a><br class=3D""><br class=3D"">Abstract:<br class=3D""> =
&nbsp;&nbsp;Routing with link state protocols in dense network =
topologies can<br class=3D""> &nbsp;&nbsp;result in sub-optimal =
convergence times due to the overhead<br class=3D""> =
&nbsp;&nbsp;associated with flooding. &nbsp;This can be addressed by =
decreasing the<br class=3D""> &nbsp;&nbsp;flooding topology so that it =
is less dense.<br class=3D""><br class=3D""> &nbsp;&nbsp;This document =
discusses the problem in some depth and an<br class=3D""> =
&nbsp;&nbsp;architectural solution. &nbsp;Specific protocol changes for =
IS-IS, OSPFv2,<br class=3D""> &nbsp;&nbsp;and OSPFv3 are described in =
this document.<br class=3D""><br class=3D""><br class=3D""><br =
class=3D""><br class=3D"">Please note that it may take a couple of =
minutes from the time of submission<br class=3D"">until the htmlized =
version and diff are available at <a href=3D"http://tools.ietf.org" =
class=3D"">tools.ietf.org</a>.<br class=3D""><br class=3D"">The IETF =
Secretariat<br class=3D""><br =
class=3D""></div></div></blockquote></div><br =
class=3D""></div></body></html>=

--Apple-Mail=_558ED581-CFAA-4D9F-A7EE-95AAA208AA14--


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From: Jeff Haas <jhaas@juniper.net>
To: "Acee Lindem (acee)" <acee@cisco.com>
CC: RFC Errata System <rfc-editor@rfc-editor.org>, "sprevidi@cisco.com" <sprevidi@cisco.com>, "spencer.giacalone@gmail.com" <spencer.giacalone@gmail.com>, John E Drake <jdrake@juniper.net>, "akatlas@gmail.com" <akatlas@gmail.com>, "db3546@att.com" <db3546@att.com>, "aretana.ietf@gmail.com" <aretana.ietf@gmail.com>, "lsr@ietf.org" <lsr@ietf.org>, Olivier Dugeon <olivier.dugeon@orange.com>
Thread-Topic: [Lsr] [Editorial Errata Reported] RFC7810 (5293)
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Date: Tue, 27 Mar 2018 17:10:09 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/gmPDI-bL-SD2R3R3hi3yvcNIscA>
Subject: Re: [Lsr] [Editorial Errata Reported] RFC7810 (5293)
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Jeff Haas <jhaas@juniper.net>
CC: RFC Errata System <rfc-editor@rfc-editor.org>, "sprevidi@cisco.com" <sprevidi@cisco.com>, "spencer.giacalone@gmail.com" <spencer.giacalone@gmail.com>, John E Drake <jdrake@juniper.net>, "akatlas@gmail.com" <akatlas@gmail.com>, "db3546@att.com" <db3546@att.com>, "aretana.ietf@gmail.com" <aretana.ietf@gmail.com>, "lsr@ietf.org" <lsr@ietf.org>, Olivier Dugeon <olivier.dugeon@orange.com>
Thread-Topic: [Lsr] [Editorial Errata Reported] RFC7810 (5293)
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Date: Tue, 27 Mar 2018 17:23:01 +0000
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Subject: Re: [Lsr] [Editorial Errata Reported] RFC7810 (5293)
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From: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>
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Thread-Topic: Requested: Volunteers to review draft-keyupate-lsvr-bgp-spf-00 
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/10p7HXZ90G7v1Q4FIXearbxt_0Y>
Subject: [Lsr] FW: Requested: Volunteers to review draft-keyupate-lsvr-bgp-spf-00
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Due to the adjacent nature of LSVR regarding LSR WG technology, the experie=
nce and feedback from the LSR WG is appreciated.

Please let LSVR WG co-chairs know if you see opportunity to provide help re=
garding review/comments on draft draft-keyupate-lsvr-bgp-spf-00

Kind Regards,

Gunter & Victor
LSVR WG Co-chairs

-----Original Message-----
From: Van De Velde, Gunter (Nokia - BE/Antwerp)=20
Sent: Friday, March 30, 2018 09:16
To: lsvr@ietf.org
Subject: Requested: Volunteers to review draft-keyupate-lsvr-bgp-spf-00=20

Hi All,

As mentioned during the LSVR WG session during IETF101, we will soon be lau=
nching a LSVR WG Adoption call regarding
draft-keyupate-lsvr-bgp-spf-00

It would be beneficial to have a few volunteers (maybe even named volunteer=
s?) to help the chairs understanding regarding the quality of this document=
, with intend to expedite technological discussion and document progress.

Please inform LSVR chairs if you see opportunity to provide feedback during=
 the next 2.5 weeks to help with review comments.

Kind Regards,
Gunter & Victor


From nobody Fri Mar 30 15:39:01 2018
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: New Version Notification for draft-ginsberg-isis-rfc7810bis-00.txt
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