Re: Methods to label the passive interfaces within ISIS

Aijun Wang <[email protected]> Tue, 14 Jan 2020 07:34:46 +0800
Newsgroups gmane.ietf.isis
Message-ID <71D49830-B207-403E-BAF2-B74A7D4E03EC__2121.03539831645$1578958701$gmane$org@tsinghua.org.cn>
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Hi, Acee:
Actually, currently it arises from the inter-AS topology management needs. I=
t is not sufficient for BGP-LS to report only the interior connections infor=
mation.
To report the edge connection information, the router within the IGP domain t=
hat run BGP-LS needs first to distinguish the stub link from the normal link=
..
There maybe exists other usages for this information, we will add them if we=
 get it. Also welcome more examples/solutions from interested LSR experts.


Aijun Wang
China Telecom

> On Jan 14, 2020, at 07:06, Acee Lindem (acee) <[email protected]> wrote:
>=20
> =EF=BB=BF
> Hi Aijun,
> =20
> From: Aijun Wang <[email protected]>
> Date: Monday, January 13, 2020 at 5:48 PM
> To: Acee Lindem <[email protected]>
> Cc: Jeff Tantsura <[email protected]>, "Les Ginsberg (ginsberg)" <gi=
[email protected]>, Tony Li <[email protected]>, Robert Raszuk <[email protected]=
et>, "[email protected]" <[email protected]>
> Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
> =20
> Hi, Acee:
> As Tony suggested also before, we can change the description for =E2=80=9C=
passive=E2=80=9D to =E2=80=9Cstub=E2=80=9D later.
> Is that more acceptable then?
> =20
> Yes =E2=80=93 but I=E2=80=99d still like to know why this is needed.
> =20
> Thanks,
> Acee
> =20
>=20
> Aijun Wang
> China Telecom
>=20
>=20
> On Jan 14, 2020, at 06:40, Acee Lindem (acee) <[email protected]> wrote:
>=20
> Hi Aijun,
> =20
> From: Aijun Wang <[email protected]>
> Date: Monday, January 13, 2020 at 5:37 PM
> To: Jeff Tantsura <[email protected]>
> Cc: Acee Lindem <[email protected]>, Tony Li <[email protected]>, "Les Ginsberg=
 (ginsberg)" <[email protected]>, "[email protected]" <[email protected]>, Robert Ras=
zuk <[email protected]>
> Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
> =20
> Hi, Acee, Les and Jeff:
> IGP is used to transfer the topology information within the domain, and th=
e stub/passive interface is the important part of one network, especially fo=
r the inter-AS topology.
> Currently, we have not figured out other use cases to distinguish other in=
terfaces type. But for stub/passive interfaces, it will be useful to floodin=
g such information to other internal routers.
> =20
> A stub interface is not necessarily a passive interace.
> =20
> OSPF has already the corresponding consideration and specifications, isn=E2=
=80=99t it reasonable for ISIS to have such capabilities also?
> =20
> OSPF doesn=E2=80=99t advertise that an interface is a passive interface. O=
thers routing can=E2=80=99t distinguish a passive interface from any other s=
tub link.
> =20
> Thanks,
> Acee
> =20
>=20
> Aijun Wang
> China Telecom
>=20
>=20
>=20
> On Jan 14, 2020, at 02:41, Jeff Tantsura <[email protected]> wrote:
>=20
> Agree with Acee and Les
> =20
> Cheers,
> Jeff
> On Jan 13, 2020, 9:29 AM -0800, Les Ginsberg (ginsberg) <[email protected]=
m>, wrote:
>=20
>=20
> I agree with Acee that there is no requirement to identify an interface as=
 passive =E2=80=93 or (as suggested in this thread) as loopback or tunnel or=
 stub=E2=80=A6
> =20
> Before debating the best encoding for information, it would be sensible to=
 define the use case/requirements.
> Simply having an advertisement that identifies an interface type isn=E2=80=
=99t sufficient to do anything useful IMO.
> =20
>    Les
> =20
> From: Acee Lindem (acee) <[email protected]>
> Sent: Monday, January 13, 2020 8:03 AM
> To: [email protected]; Aijun Wang <[email protected]>
> Cc: Les Ginsberg (ginsberg) <[email protected]>; Robert Raszuk <robert@ra=
szuk.net>; [email protected]
> Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
> =20
> Hi Aijun,
> I guess the external use case for this is advertisement in BGP-LS for Netw=
ork Management purposes?? There really isn=E2=80=99t IS-IS requirement to kn=
ow whether or not an interface is a passive interface.
> Thanks,
> Acee
> =20
> From: Lsr <[email protected]> on behalf of Tony Li <[email protected]>
> Date: Monday, January 13, 2020 at 11:00 AM
> To: Aijun Wang <[email protected]>
> Cc: "Les Ginsberg (ginsberg)" <[email protected]>, Robert Raszuk <robert@=
raszuk.net>, "[email protected]" <[email protected]>
> Subject: Re: [Lsr] Methods to label the passive interfaces within ISIS
> =20
> =20
> Hi Anjun,
> =20
> =20
>=20
> Is it reasonable to put the link attribute information into the =E2=80=9CI=
P Reachability TLV=E2=80=9D?
> IMHO, such stub link is not the normal links within IGP domain.  Label the=
 related prefix is coming from the passive/stub link seems also acceptable?
> =20
> =20
> Well, a passive interface is really configured so that you advertise the i=
nterface=E2=80=99s prefix.  Attaching the data that you want to the associat=
ed data seems reasonable to me.
> =20
> There=E2=80=99s no good IS Neighbor advertisement to attach the sub-TLV to=
 because there is no neighbor.
> =20
> Tony
> =20
> =20
>=20
> _______________________________________________
> Lsr mailing list
> [email protected]
> https://www.ietf.org/mailman/listinfo/lsr
> _______________________________________________
> Lsr mailing list
> [email protected]
> https://www.ietf.org/mailman/listinfo/lsr

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Hi, Acee:<div>Actually, currently it arises=
 from the inter-AS topology management needs. It is not sufficient for BGP-L=
S to report only the interior connections information.</div><div>To report t=
he edge connection information, the router within the IGP domain that run BG=
P-LS needs first to distinguish the stub link from the normal link.</div><di=
v>There maybe exists other usages for this information, we will add them if w=
e get it. Also welcome more examples/solutions from interested LSR experts.<=
/div><div><br><br><div dir=3D"ltr">Aijun Wang<div>China Telecom</div></div><=
div dir=3D"ltr"><br><blockquote type=3D"cite">On Jan 14, 2020, at 07:06, Ace=
e Lindem (acee) &lt;[email protected]&gt; wrote:<br><br></blockquote></div><blo=
ckquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF

<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8">
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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi Aijun, <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0=
in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><b><span style=3D"font-siz=
e:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">Aijun Wang &lt;wanga=
[email protected]&gt;<br>
<b>Date: </b>Monday, January 13, 2020 at 5:48 PM<br>
<b>To: </b>Acee Lindem &lt;[email protected]&gt;<br>
<b>Cc: </b>Jeff Tantsura &lt;[email protected]&gt;, "Les Ginsberg (gin=
sberg)" &lt;[email protected]&gt;, Tony Li &lt;[email protected]&gt;, Robert R=
aszuk &lt;[email protected]&gt;, "[email protected]" &lt;[email protected]&gt;<br>
<b>Subject: </b>Re: [Lsr] Methods to label the passive interfaces within ISI=
S<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><o:p>&nbsp;</o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Hi, Acee: <o:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">As Tony suggested also bef=
ore, we can change the description for =E2=80=9Cpassive=E2=80=9D to =E2=80=9C=
stub=E2=80=9D later.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Is that more acceptable th=
en?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Yes =E2=80=93 but I=E2=80=99d still like to know why t=
his is needed. <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal">Acee<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:.5in">
<o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Aijun Wang <o:p></o:p></p>=

<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">China Telecom<o:p></o:p></=
p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><br>
<br>
<o:p></o:p></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:.5in">
On Jan 14, 2020, at 06:40, Acee Lindem (acee) &lt;[email protected]&gt; wrote:<=
o:p></o:p></p>
</blockquote>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Hi Aijun, <o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0=
in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:1.0in"><b><span style=3D"font-si=
ze:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">Aijun Wang &lt;wanga=
[email protected]&gt;<br>
<b>Date: </b>Monday, January 13, 2020 at 5:37 PM<br>
<b>To: </b>Jeff Tantsura &lt;[email protected]&gt;<br>
<b>Cc: </b>Acee Lindem &lt;[email protected]&gt;, Tony Li &lt;[email protected]&g=
t;, "Les Ginsberg (ginsberg)" &lt;[email protected]&gt;, "[email protected]" &lt=
;[email protected]&gt;, Robert Raszuk &lt;[email protected]&gt;<br>
<b>Subject: </b>Re: [Lsr] Methods to label the passive interfaces within ISI=
S</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Hi, Acee, Les and Jeff: <=
o:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">IGP is used to transfer t=
he topology information within the domain, and the stub/passive interface is=
 the important part of one network, especially for the inter-AS topology.<o:=
p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Currently, we have not fi=
gured out other use cases to distinguish other interfaces type. But for stub=
/passive interfaces, it will be useful to flooding such information to other=
 internal routers.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">A stub interface is not ne=
cessarily a passive interace.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">OSPF has already the corr=
esponding consideration and specifications, isn=E2=80=99t it reasonable for I=
SIS to have such capabilities also?<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">OSPF doesn=E2=80=99t adver=
tise that an interface is a passive interface. Others routing can=E2=80=99t d=
istinguish a passive interface from any other stub link.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">Acee<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Aijun Wang <o:p></o:p></p=
>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">China Telecom<o:p></o:p><=
/p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in"><br>
<br>
<br>
<o:p></o:p></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:1.0in">
On Jan 14, 2020, at 02:41, Jeff Tantsura &lt;[email protected]&gt; wro=
te:<o:p></o:p></p>
</blockquote>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div name=3D"messageBodySection">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Agree with Acee and Les<o=
:p></o:p></p>
</div>
</div>
<div name=3D"messageSignatureSection">
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">&nbsp;<o:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Cheers, <o:p></o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">Jeff<o:p></o:p></p>
</div>
</div>
</div>
<div name=3D"messageReplySection">
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">On Jan 13, 2020, 9:29 AM -=
0800, Les Ginsberg (ginsberg) &lt;[email protected]&gt;, wrote:<br>
<br>
<br>
<o:p></o:p></p>
<blockquote style=3D"border:none;border-left:solid #1ABC9C 1.0pt;padding:0in=
 0in 0in 8.0pt;margin-left:3.75pt;margin-top:3.75pt;margin-right:3.75pt;marg=
in-bottom:3.75pt">
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
I agree with Acee that there is no requirement to identify an interface as p=
assive =E2=80=93 or (as suggested in this thread) as loopback or tunnel or s=
tub=E2=80=A6<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
Before debating the best encoding for information, it would be sensible to d=
efine the use case/requirements.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
Simply having an advertisement that identifies an interface type isn=E2=80=99=
t sufficient to do anything useful IMO.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;&nbsp; Les<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4=
..0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0=
in 0in">
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
<b>From:</b> Acee Lindem (acee) &lt;[email protected]&gt;<br>
<b>Sent:</b> Monday, January 13, 2020 8:03 AM<br>
<b>To:</b> [email protected]; Aijun Wang &lt;[email protected]&gt;<br>=

<b>Cc:</b> Les Ginsberg (ginsberg) &lt;[email protected]&gt;; Robert Raszuk=
 &lt;[email protected]&gt;; [email protected]<br>
<b>Subject:</b> Re: [Lsr] Methods to label the passive interfaces within ISI=
S<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
Hi Aijun,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
I guess the external use case for this is advertisement in BGP-LS for Networ=
k Management purposes?? There really isn=E2=80=99t IS-IS requirement to know=
 whether or not an interface is a passive interface.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
Acee<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.0in">
&nbsp;<o:p></o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0=
in 0in">
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
<b><span style=3D"font-size:12.0pt;color:black">From:</span></b> <span style=
=3D"font-size:12.0pt;color:black">
Lsr &lt;<a href=3D"mailto:[email protected]">[email protected]</a>&gt;=
 on behalf of Tony Li &lt;<a href=3D"mailto:[email protected]">[email protected]=
</a>&gt;<br>
<b>Date:</b> Monday, January 13, 2020 at 11:00 AM<br>
<b>To:</b> Aijun Wang &lt;<a href=3D"mailto:[email protected]">wanga=
[email protected]</a>&gt;<br>
<b>Cc:</b> "Les Ginsberg (ginsberg)" &lt;<a href=3D"mailto:[email protected]=
m">[email protected]</a>&gt;, Robert Raszuk &lt;<a href=3D"mailto:robert@ra=
szuk.net">[email protected]</a>&gt;, "<a href=3D"mailto:[email protected]">lsr@ie=
tf.org</a>" &lt;<a href=3D"mailto:[email protected]">[email protected]</a>&gt;<br>
<b>Subject:</b> Re: [Lsr] Methods to label the passive interfaces within ISI=
S</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
Hi Anjun,<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
<blockquote style=3D"border:none;border-left:solid #E67E22 1.0pt;padding:0in=
 0in 0in 8.0pt;margin-left:3.75pt;margin-top:3.75pt;margin-right:3.75pt;marg=
in-bottom:3.75pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
<span style=3D"font-size:10.5pt;color:#1F497D">Is it reasonable to put the l=
ink attribute information into the =E2=80=9CIP Reachability TLV=E2=80=9D?</s=
pan><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
<span style=3D"font-size:10.5pt;color:#1F497D">IMHO, such stub link is not t=
he normal links within IGP domain.&nbsp; Label the related prefix is coming f=
rom the passive/stub link seems also acceptable?</span><o:p></o:p></p>
</div>
</div>
</blockquote>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
Well, a passive interface is really configured so that you advertise the int=
erface=E2=80=99s prefix. &nbsp;Attaching the data that you want to the assoc=
iated data seems reasonable to me.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
There=E2=80=99s no good IS Neighbor advertisement to attach the sub-TLV to b=
ecause there is no neighbor.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
Tony<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0in;margin-right:0in;marg=
in-bottom:12.0pt;margin-left:1.5in">
&nbsp;<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in">_________________________=
______________________<br>
Lsr mailing list<br>
[email protected]<br>
https://www.ietf.org/mailman/listinfo/lsr<o:p></o:p></p>
</blockquote>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">__________________________=
_____________________<br>
Lsr mailing list<br>
[email protected]<br>
https://www.ietf.org/mailman/listinfo/lsr<o:p></o:p></p>
</div>
</blockquote>
</div>
</div>


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