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From: "George, Wes" <wesley.george@twcable.com>
To: "draft-xu-isis-ipv6-router-id@tools.ietf.org" <draft-xu-isis-ipv6-router-id@tools.ietf.org>, "draft-xu-ospf-ipv6-router-id@tools.ietf.org" <draft-xu-ospf-ipv6-router-id@tools.ietf.org>
Date: Thu, 1 May 2014 13:42:00 -0400
Thread-Topic: IPv6 router IDs
Thread-Index: Ac9lZKe8WIXG2KOeTLezgn/7BSaoMw==
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Subject: [sunset4] IPv6 router IDs
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From: "George, Wes" <wesley.george@twcable.com>
To: "xuxiaohu@huawei.com" <xuxiaohu@huawei.com>
Date: Thu, 1 May 2014 13:50:40 -0400
Thread-Topic: [sunset4] IPv6 router IDs
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Subject: Re: [sunset4] IPv6 router IDs
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Subject: Re: [sunset4] IPv6 router IDs
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Le 2014-05-01 =E0 13:50, George, Wes <wesley.george@twcable.com> a =E9crit=
 :

> I got a bounce-back on all 3 draft aliases, trying again with the =
authors=92s email addresses directly.=20
>=20
> From: <George>, "George, Wes" <wesley.george@twcable.com>
> Date: Thursday, May 1, 2014 at 1:42 PM
> To: "draft-xu-isis-ipv6-router-id@tools.ietf.org" =
<draft-xu-isis-ipv6-router-id@tools.ietf.org>, =
"draft-xu-ospf-ipv6-router-id@tools.ietf.org" =
<draft-xu-ospf-ipv6-router-id@tools.ietf.org>
> Cc: "draft-fan-idr-ipv6-bgp-id@tools.ietf.org" =
<draft-fan-idr-ipv6-bgp-id@tools.ietf.org>, "sunset4@ietf.org" =
<sunset4@ietf.org>
> Subject: [sunset4] IPv6 router IDs
>=20
> I see that you have submitted two drafts for IPv6 router IDs in ISIS =
and OSPF, noting that the existing router ID is only 4 octets. This has =
also come up in IDR for BGP. The authors of that draft are copied. I=92ll =
give you a similar set of feedback to what I gave them -=20
>=20
> It is important to distinguish between places where a unique =
identifier is needed, and by convention an IPv4 address assigned to the =
device has been used to provide that unique ID, vs. places where the =
actual IP address has some sort of importance to the protocol (I.e. That =
information must be available to take action on).
> In other words, is the protocol requirement that the ID be unique =
across some domain, but that the actual value does not matter, or is the =
protocol requirement that the value must correspond to something on the =
router? In many of the former cases, the fact that the value isn=92t =
relevant has been used to make recommendations that are easier for =
humans to deal with (I.e. Tying the router ID to an IP address) but that =
value as a human-readable set of info does not necessarily justify  =
changes to the protocol to support that convention as we move to IPv6.=20=

> I would argue that the router ID used in routing protocols must merely =
be unique, but it doesn=92t have to be an IP address at all. Thus it is =
not strictly necessary to create a new field to carry IPv6 addresses =
when operating without IPv4 addresses on a network. If you believe =
otherwise, the justification needs to be documented in the draft.=20
>=20
> There are many places in IETF protocols where a 32 bit unique =
identifier is needed,

Back about 13 years ago, when we converted the NTP code to IPv6 and run =
the first IPv6 NTP server, we had the same issue. NTP4 had a 32 bit id =
to uniquely identify servers.  We tried various ways with NTP protocol =
engineers and the result was to keep the 32 bit id as is, with some =
additional protocol logic "behind the scene".

Marc.


> and by convention an IPv4 address has been used. It would be far more =
useful to write a general draft identifying this problem and discussing =
several solutions, including simply generating unique IDs manually, =
systematically generating a random ID, etc.  the place for such a draft =
may be in Sunset4, either as a part of the existing gap analysis draft =
or as another standalone draft.=20





>=20
> There was rather a long discussion about this on IDR, thread here: =
https://mailarchive.ietf.org/arch/search/?qdr=3Da&email_list=3Didr&q=3D%22=
%5Bidr%5D+%5Bv6ops%5D+BGP+Identifier%22&as=3D1&gbt=3D1
>=20
> And in the IDR meeting, minutes:
> http://www.ietf.org/proceedings/89/minutes/minutes-89-idr (see page =
11)
>=20
> I=92d encourage the authors of these drafts to work together on this.
>=20
> Thanks,
>  =20
> Wes George
>=20
> Anything below this line has been added by my company=92s mail server, =
I have no control over it.
> -----------
>=20
> This E-mail and any of its attachments may contain Time Warner Cable =
proprietary information, which is privileged, confidential, or subject =
to copyright belonging to Time Warner Cable. This E-mail is intended =
solely for the use of the individual or entity to which it is addressed. =
If you are not the intended recipient of this E-mail, you are hereby =
notified that any dissemination, distribution, copying, or action taken =
in relation to the contents of and attachments to this E-mail is =
strictly prohibited and may be unlawful. If you have received this =
E-mail in error, please notify the sender immediately and permanently =
delete the original and any copy of this E-mail and any printout.
> _______________________________________________
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> https://www.ietf.org/mailman/listinfo/sunset4


--Apple-Mail=_C4CBC826-EDFC-45EC-907C-E5C5EBE37CCD
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=windows-1252

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dwindows-1252"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space;"><br><div><div>Le 2014-05-01 =E0 13:50, George, Wes =
&lt;<a =
href=3D"mailto:wesley.george@twcable.com">wesley.george@twcable.com</a>&gt=
; a =E9crit :</div><br class=3D"Apple-interchange-newline"><blockquote =
type=3D"cite">

<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8">

<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space; font-size: 14px; font-family: =
Calibri, sans-serif;">
<div>
<div>
<div>I got a bounce-back on all 3 draft aliases, trying again with the =
authors=92s email addresses directly.&nbsp;</div>
<div><br>
</div>
</div>
</div>
<span id=3D"OLK_SRC_BODY_SECTION">
<div style=3D"font-family: Calibri; font-size: 11pt; text-align: left; =
border-width: 1pt medium medium; border-style: solid none none; padding: =
3pt 0in 0in; border-top-color: rgb(181, 196, 223);">
<span style=3D"font-weight:bold">From: </span>&lt;George&gt;, "George, =
Wes" &lt;<a =
href=3D"mailto:wesley.george@twcable.com">wesley.george@twcable.com</a>&gt=
;<br>
<span style=3D"font-weight:bold">Date: </span>Thursday, May 1, 2014 at =
1:42 PM<br>
<span style=3D"font-weight:bold">To: </span>"<a =
href=3D"mailto:draft-xu-isis-ipv6-router-id@tools.ietf.org">draft-xu-isis-=
ipv6-router-id@tools.ietf.org</a>" &lt;<a =
href=3D"mailto:draft-xu-isis-ipv6-router-id@tools.ietf.org">draft-xu-isis-=
ipv6-router-id@tools.ietf.org</a>&gt;,
 "<a =
href=3D"mailto:draft-xu-ospf-ipv6-router-id@tools.ietf.org">draft-xu-ospf-=
ipv6-router-id@tools.ietf.org</a>" &lt;<a =
href=3D"mailto:draft-xu-ospf-ipv6-router-id@tools.ietf.org">draft-xu-ospf-=
ipv6-router-id@tools.ietf.org</a>&gt;<br>
<span style=3D"font-weight:bold">Cc: </span>"<a =
href=3D"mailto:draft-fan-idr-ipv6-bgp-id@tools.ietf.org">draft-fan-idr-ipv=
6-bgp-id@tools.ietf.org</a>" &lt;<a =
href=3D"mailto:draft-fan-idr-ipv6-bgp-id@tools.ietf.org">draft-fan-idr-ipv=
6-bgp-id@tools.ietf.org</a>&gt;, "<a =
href=3D"mailto:sunset4@ietf.org">sunset4@ietf.org</a>"
 &lt;<a href=3D"mailto:sunset4@ietf.org">sunset4@ietf.org</a>&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>[sunset4] IPv6 router =
IDs<br>
</div>
<div><br>
</div>
<div>
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space; font-size: 14px; font-family: =
Calibri, sans-serif;">
<div>I see that you have submitted two drafts for IPv6 router IDs in =
ISIS and OSPF, noting that the existing router ID is only 4 octets. This =
has also come up in IDR for BGP. The authors of that draft are copied. =
I=92ll give you a similar set of feedback to what
 I gave them -&nbsp;</div>
<div><br>
</div>
<div>It is important to distinguish between places where a unique =
identifier is needed, and by
<span style=3D"font-weight: bold;">convention</span>&nbsp;an IPv4 =
address assigned to the device has been used to provide that unique ID, =
vs. places where the actual IP address has some sort of importance to =
the protocol (I.e. That information must be available to
 take action on).</div>
<div>In other words, is the protocol requirement that the ID be unique =
across some domain, but that the actual value does not matter, or is the =
protocol requirement that the value must correspond to something on the =
router? In many of the former cases, the
 fact that the value isn=92t relevant has been used to make =
recommendations that are easier for humans to deal with (I.e. Tying the =
router ID to an IP address) but that value as a human-readable set of =
info does not necessarily justify &nbsp;changes to the protocol
 to support that convention as we move to IPv6.&nbsp;</div>
<div>I would argue that the router ID used in routing protocols must =
merely be unique, but it doesn=92t have to be an IP address at all. Thus =
it is not strictly necessary to create a new field to carry IPv6 =
addresses when operating without IPv4 addresses on a
 network. If you believe otherwise, the justification needs to be =
documented in the draft.&nbsp;</div>
<div><br>
</div>
<div>There are many places in IETF protocols where a 32 bit unique =
identifier is needed, =
</div></div></div></span></div></blockquote><div><br></div><div>Back =
about 13 years ago, when we converted the NTP code to IPv6 and run the =
first IPv6 NTP server, we had the same issue. NTP4 had a 32 bit id to =
uniquely identify servers. &nbsp;We tried various ways with NTP protocol =
engineers and the result was to keep the 32 bit id as is, with some =
additional protocol logic "behind the =
scene".</div><div><br></div><div>Marc.</div><div><br></div><br><blockquote=
 type=3D"cite"><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: =
space; -webkit-line-break: after-white-space; font-size: 14px; =
font-family: Calibri, sans-serif;"><span =
id=3D"OLK_SRC_BODY_SECTION"><div><div style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; =
font-size: 14px; font-family: Calibri, sans-serif;"><div>and by =
convention an IPv4 address has been used. It would be far more useful to =
write a general draft identifying this problem and discussing several =
solutions, including
 simply generating unique IDs manually, systematically generating a =
random ID, etc. &nbsp;the place for such a draft may be in Sunset4, =
either as a part of the existing gap analysis draft or as another =
standalone =
draft.&nbsp;</div></div></div></span></div></blockquote><div><br></div><di=
v><br></div><div><br></div><div><br></div><br><blockquote =
type=3D"cite"><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: =
space; -webkit-line-break: after-white-space; font-size: 14px; =
font-family: Calibri, sans-serif;"><span =
id=3D"OLK_SRC_BODY_SECTION"><div><div style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space; =
font-size: 14px; font-family: Calibri, sans-serif;">
<div><br>
</div>
<div>There was rather a long discussion about this on IDR, thread =
here:&nbsp;<a =
href=3D"https://mailarchive.ietf.org/arch/search/?qdr=3Da&amp;email_list=3D=
idr&amp;q=3D%22%5Bidr%5D+%5Bv6ops%5D+BGP+Identifier%22&amp;as=3D1&amp;gbt=3D=
1">https://mailarchive.ietf.org/arch/search/?qdr=3Da&amp;email_list=3Didr&=
amp;q=3D%22%5Bidr%5D+%5Bv6ops%5D+BGP+Identifier%22&amp;as=3D1&amp;gbt=3D1<=
/a></div>
<div><br>
</div>
<div>And in the IDR meeting, minutes:</div>
<div><a =
href=3D"http://www.ietf.org/proceedings/89/minutes/minutes-89-idr">http://=
www.ietf.org/proceedings/89/minutes/minutes-89-idr</a>&nbsp;(see page =
11)</div>
<div><br>
</div>
<div>I=92d encourage the authors of these drafts to work together on =
this.</div>
<div><br>
</div>
<div><div style=3D"margin: 0in 0in 0.0001pt; font-size: =
11pt;">Thanks,<o:p></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 11pt;"><o:p>&nbsp;</o:p><span style=3D"font-size: =
11pt;">&nbsp;</span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 11pt;">Wes George<o:p></o:p></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 11pt;"><span style=3D"color: rgb(127, 127, =
127); font-size: 11pt;"><br>
</span></div><div style=3D"margin: 0in 0in 0.0001pt; font-size: =
11pt;"><span style=3D"color: rgb(127, 127, 127); font-size: =
11pt;">Anything below this line has been added by my company=92s mail =
server, I have no control over it.</span></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 11pt;"><span style=3D"color: rgb(127, 127, =
127);">-----------</span></div>
</div>
</div>
</div>
</span><br>
<hr>
<font face=3D"Arial" color=3D"Gray" size=3D"1">This E-mail and any of =
its attachments may contain Time Warner Cable proprietary information, =
which is privileged, confidential, or subject to copyright belonging to =
Time Warner Cable. This E-mail is intended solely
 for the use of the individual or entity to which it is addressed. If =
you are not the intended recipient of this E-mail, you are hereby =
notified that any dissemination, distribution, copying, or action taken =
in relation to the contents of and attachments to
 this E-mail is strictly prohibited and may be unlawful. If you have =
received this E-mail in error, please notify the sender immediately and =
permanently delete the original and any copy of this E-mail and any =
printout.<br>
</font>
</div>

_______________________________________________<br>sunset4 mailing =
list<br><a =
href=3D"mailto:sunset4@ietf.org">sunset4@ietf.org</a><br>https://www.ietf.=
org/mailman/listinfo/sunset4<br></blockquote></div><br></body></html>=

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From: "Fan, Peng" <fanpeng@chinamobile.com>
To: "'George, Wes'" <wesley.george@twcable.com>, <draft-xu-isis-ipv6-router-id@tools.ietf.org>, <draft-xu-ospf-ipv6-router-id@tools.ietf.org>
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Hi Wesley,

=20

Thanks for the information. I=E2=80=99ve been working on this following =
the feedbacks from the last meeting, and will contact Xiaohu to see if =
we are on the same page.

=20

Best regards,

Peng

=20

From: sunset4 [mailto:sunset4-bounces@ietf.org] On Behalf Of George, Wes
Sent: Friday, May 02, 2014 1:42 AM
To: draft-xu-isis-ipv6-router-id@tools.ietf.org; =
draft-xu-ospf-ipv6-router-id@tools.ietf.org
Cc: draft-fan-idr-ipv6-bgp-id@tools.ietf.org; sunset4@ietf.org
Subject: [sunset4] IPv6 router IDs

=20

I see that you have submitted two drafts for IPv6 router IDs in ISIS and =
OSPF, noting that the existing router ID is only 4 octets. This has also =
come up in IDR for BGP. The authors of that draft are copied. =
I=E2=80=99ll give you a similar set of feedback to what I gave them -=20

=20

It is important to distinguish between places where a unique identifier =
is needed, and by convention an IPv4 address assigned to the device has =
been used to provide that unique ID, vs. places where the actual IP =
address has some sort of importance to the protocol (I.e. That =
information must be available to take action on).

In other words, is the protocol requirement that the ID be unique across =
some domain, but that the actual value does not matter, or is the =
protocol requirement that the value must correspond to something on the =
router? In many of the former cases, the fact that the value =
isn=E2=80=99t relevant has been used to make recommendations that are =
easier for humans to deal with (I.e. Tying the router ID to an IP =
address) but that value as a human-readable set of info does not =
necessarily justify  changes to the protocol to support that convention =
as we move to IPv6.=20

I would argue that the router ID used in routing protocols must merely =
be unique, but it doesn=E2=80=99t have to be an IP address at all. Thus =
it is not strictly necessary to create a new field to carry IPv6 =
addresses when operating without IPv4 addresses on a network. If you =
believe otherwise, the justification needs to be documented in the =
draft.=20

=20

There are many places in IETF protocols where a 32 bit unique identifier =
is needed, and by convention an IPv4 address has been used. It would be =
far more useful to write a general draft identifying this problem and =
discussing several solutions, including simply generating unique IDs =
manually, systematically generating a random ID, etc.  the place for =
such a draft may be in Sunset4, either as a part of the existing gap =
analysis draft or as another standalone draft.=20

=20

There was rather a long discussion about this on IDR, thread here: =
https://mailarchive.ietf.org/arch/search/?qdr=3Da =
<https://mailarchive.ietf.org/arch/search/?qdr=3Da&email_list=3Didr&q=3D%=
22%5Bidr%5D+%5Bv6ops%5D+BGP+Identifier%22&as=3D1&gbt=3D1> =
&email_list=3Didr&q=3D%22%5Bidr%5D+%5Bv6ops%5D+BGP+Identifier%22&as=3D1&g=
bt=3D1

=20

And in the IDR meeting, minutes:

http://www.ietf.org/proceedings/89/minutes/minutes-89-idr (see page 11)

=20

I=E2=80=99d encourage the authors of these drafts to work together on =
this.

=20

Thanks,

 =20

Wes George

=20

Anything below this line has been added by my company=E2=80=99s mail =
server, I have no control over it.

-----------

=20

  _____ =20

This E-mail and any of its attachments may contain Time Warner Cable =
proprietary information, which is privileged, confidential, or subject =
to copyright belonging to Time Warner Cable. This E-mail is intended =
solely for the use of the individual or entity to which it is addressed. =
If you are not the intended recipient of this E-mail, you are hereby =
notified that any dissemination, distribution, copying, or action taken =
in relation to the contents of and attachments to this E-mail is =
strictly prohibited and may be unlawful. If you have received this =
E-mail in error, please notify the sender immediately and permanently =
delete the original and any copy of this E-mail and any printout.


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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Hi Wesley,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Thanks for the information. I=E2=80=99ve been working on this =
following the feedbacks from the last meeting, and will contact Xiaohu =
to see if we are on the same page.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Best regards,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'>Peng<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
sunset4 [mailto:sunset4-bounces@ietf.org] <b>On Behalf Of </b>George, =
Wes<br><b>Sent:</b> Friday, May 02, 2014 1:42 AM<br><b>To:</b> =
draft-xu-isis-ipv6-router-id@tools.ietf.org; =
draft-xu-ospf-ipv6-router-id@tools.ietf.org<br><b>Cc:</b> =
draft-fan-idr-ipv6-bgp-id@tools.ietf.org; =
sunset4@ietf.org<br><b>Subject:</b> [sunset4] IPv6 router =
IDs<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
>I see that you have submitted two drafts for IPv6 router IDs in ISIS =
and OSPF, noting that the existing router ID is only 4 octets. This has =
also come up in IDR for BGP. The authors of that draft are copied. =
I=E2=80=99ll give you a similar set of feedback to what I gave them =
-&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
>It is important to distinguish between places where a unique identifier =
is needed, and by <b>convention</b>&nbsp;an IPv4 address assigned to the =
device has been used to provide that unique ID, vs. places where the =
actual IP address has some sort of importance to the protocol (I.e. That =
information must be available to take action =
on).<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
>In other words, is the protocol requirement that the ID be unique =
across some domain, but that the actual value does not matter, or is the =
protocol requirement that the value must correspond to something on the =
router? In many of the former cases, the fact that the value =
isn=E2=80=99t relevant has been used to make recommendations that are =
easier for humans to deal with (I.e. Tying the router ID to an IP =
address) but that value as a human-readable set of info does not =
necessarily justify &nbsp;changes to the protocol to support that =
convention as we move to IPv6.&nbsp;<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
>I would argue that the router ID used in routing protocols must merely =
be unique, but it doesn=E2=80=99t have to be an IP address at all. Thus =
it is not strictly necessary to create a new field to carry IPv6 =
addresses when operating without IPv4 addresses on a network. If you =
believe otherwise, the justification needs to be documented in the =
draft.&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
>There are many places in IETF protocols where a 32 bit unique =
identifier is needed, and by convention an IPv4 address has been used. =
It would be far more useful to write a general draft identifying this =
problem and discussing several solutions, including simply generating =
unique IDs manually, systematically generating a random ID, etc. =
&nbsp;the place for such a draft may be in Sunset4, either as a part of =
the existing gap analysis draft or as another standalone =
draft.&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
>There was rather a long discussion about this on IDR, thread =
here:&nbsp;<a =
href=3D"https://mailarchive.ietf.org/arch/search/?qdr=3Da&amp;email_list=3D=
idr&amp;q=3D%22%5Bidr%5D+%5Bv6ops%5D+BGP+Identifier%22&amp;as=3D1&amp;gbt=
=3D1">https://mailarchive.ietf.org/arch/search/?qdr=3Da&amp;email_list=3D=
idr&amp;q=3D%22%5Bidr%5D+%5Bv6ops%5D+BGP+Identifier%22&amp;as=3D1&amp;gbt=
=3D1</a><o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
>And in the IDR meeting, minutes:<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
><a =
href=3D"http://www.ietf.org/proceedings/89/minutes/minutes-89-idr">http:/=
/www.ietf.org/proceedings/89/minutes/minutes-89-idr</a>&nbsp;(see page =
11)<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
>I=E2=80=99d encourage the authors of these drafts to work together on =
this.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:black'>Thanks,<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:black'>&nbsp;&nbsp;<o:p></o:p></span></p>=
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;color:black'>Wes =
George<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:black'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#7F7F7F'>Anything below this line has =
been added by my company=E2=80=99s mail server, I have no control over =
it.</span><span =
style=3D'font-size:11.0pt;color:black'><o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;color:#7F7F7F'>-----------</span><span =
style=3D'font-size:11.0pt;color:black'><o:p></o:p></span></p></div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
><o:p>&nbsp;</o:p></span></p><div class=3DMsoNormal align=3Dcenter =
style=3D'text-align:center'><span =
style=3D'font-size:10.5pt;font-family:"Calibri","sans-serif";color:black'=
><hr size=3D2 width=3D"100%" align=3Dcenter></span></div><p =
class=3DMsoNormal><span =
style=3D'font-size:7.5pt;font-family:"Arial","sans-serif";color:gray'>Thi=
s E-mail and any of its attachments may contain Time Warner Cable =
proprietary information, which is privileged, confidential, or subject =
to copyright belonging to Time Warner Cable. This E-mail is intended =
solely for the use of the individual or entity to which it is addressed. =
If you are not the intended recipient of this E-mail, you are hereby =
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><o:p></o:p></span></p></div></body></html>
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From: Xuxiaohu <xuxiaohu@huawei.com>
To: "George, Wes" <wesley.george@twcable.com>
Thread-Topic: [sunset4] IPv6 router IDs
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Date: Sun, 4 May 2014 08:29:04 +0000
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Xuxiaohu <xuxiaohu@huawei.com>, "George, Wes" <wesley.george@twcable.com>
Thread-Topic: [sunset4] IPv6 router IDs
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Date: Sun, 4 May 2014 13:42:00 +0000
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Subject: Re: [sunset4] IPv6 router IDs
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From: Xuxiaohu <xuxiaohu@huawei.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "George, Wes" <wesley.george@twcable.com>
Thread-Topic: [sunset4] IPv6 router IDs
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Date: Mon, 5 May 2014 02:31:31 +0000
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Subject: Re: [sunset4] IPv6 router IDs
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From: Acee Lindem <acee.lindem@ericsson.com>
To: Xuxiaohu <xuxiaohu@huawei.com>, "George, Wes" <wesley.george@twcable.com>
Thread-Topic: [Isis-wg] [sunset4] IPv6 router IDs
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Subject: Re: [sunset4] [Isis-wg]  IPv6 router IDs
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Subject: Re: [sunset4] [Isis-wg]  IPv6 router IDs
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On 5/5/14, 9:28 AM, Acee Lindem wrote:
> Xiaohu =E2=80=93 what are precisely the situations that you think you n=
eed this
> IPv6 address?=20
> Acee

if you're using router-id's as equivalency as an ipv4 unicast addresses.
you're doing so at your peril because there is zero assurance that those
actually map. the first time you have a router id of
11100000000000000000000000000101 well bummer.

I don't find the embedding of semantic meaning in router-ids to be more
compelling then it was in ip addresses.

> From: Xuxiaohu <xuxiaohu@huawei.com <mailto:xuxiaohu@huawei.com>>
> Date: Sunday, May 4, 2014 1:29 AM
> To: "George, Wes" <wesley.george@twcable.com
> <mailto:wesley.george@twcable.com>>
> Cc: OSPF - OSPF WG List <ospf@ietf.org <mailto:ospf@ietf.org>>,
> "isis-wg@ietf.org <mailto:isis-wg@ietf.org>" <isis-wg@ietf.org
> <mailto:isis-wg@ietf.org>>, "fanpeng@chinamobile.com
> <mailto:fanpeng@chinamobile.com>" <fanpeng@chinamobile.com
> <mailto:fanpeng@chinamobile.com>>, "sunset4@ietf.org
> <mailto:sunset4@ietf.org>" <sunset4@ietf.org <mailto:sunset4@ietf.org>>=
,
> "lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobile.com>"
> <lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobile.com>>
> Subject: Re: [Isis-wg] [sunset4] IPv6 router IDs
>=20
>     Hi Wes,
>=20
>     =20
>=20
>     Thanks for pointing out these two drafts.
>=20
>     =20
>=20
>     The motivation for these two drafts
>     (http://tools.ietf.org/html/draft-xu-isis-ipv6-router-id-00 and
>     http://tools.ietf.org/html/draft-xu-ospf-ipv6-router-id-00) is very=

>     simple: the IPv6 ISIS|OSPF capability TLV/RI-LSA which are used for=

>     advertising router capabilities can be flooded across areas,
>     however, only a 4-octect router ID is carried in them. As a result,=

>     it=E2=80=99s hard for routers in one area to establish correlations=
 between
>     IPv6 addresses and capabilities of routers in another area. For
>     example, assume IS-IS router A in one area has established a L3VPN
>     session with IS-IS router B in another area over their own IPv6
>     addresses. When router A needs to send L3VPN traffic to router B vi=
a
>     a MPLS-SR tunnel, router A wants to know whether router B has the
>     ELC (http://tools.ietf.org/html/draft-xu-isis-mpls-elc-00) before
>     <http://tools.ietf.org/html/draft-xu-isis-mpls-elc-00)%20before>
>     inserting an EL into the MPLS-SR packet . However, the Capability
>     TLV originated by router B doesn=E2=80=99t carried an IPv6 address =
of its
>     own. As a result, it=E2=80=99s hard for router A to know the ELC of=
 router B.
>=20
>     =20
>=20
>     Best regards,
>=20
>     Xiaohu
>=20
>     =20
>=20
>     *=E5=8F=91=E4=BB=B6=E4=BA=BA:*George, Wes [mailto:wesley.george@twc=
able.com]
>     *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:*2014=E5=B9=B45=E6=9C=882=E6=97=
=A51:51
>     *=E6=94=B6=E4=BB=B6=E4=BA=BA:*Xuxiaohu
>     *=E6=8A=84=E9=80=81:*sunset4@ietf.org <mailto:sunset4@ietf.org>;
>     fanpeng@chinamobile.com <mailto:fanpeng@chinamobile.com>;
>     lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobile.com>
>     *=E4=B8=BB=E9=A2=98:*Re: [sunset4] IPv6 router IDs
>=20
>     =20
>=20
>     I got a bounce-back on all 3 draft aliases, trying again with the
>     authors=E2=80=99s email addresses directly.=20
>=20
>     =20
>=20
>     *From: *<George>, "George, Wes" <wesley.george@twcable.com
>     <mailto:wesley.george@twcable.com>>
>     *Date: *Thursday, May 1, 2014 at 1:42 PM
>     *To: *"draft-xu-isis-ipv6-router-id@tools.ietf.org
>     <mailto:draft-xu-isis-ipv6-router-id@tools.ietf.org>"
>     <draft-xu-isis-ipv6-router-id@tools.ietf.org
>     <mailto:draft-xu-isis-ipv6-router-id@tools.ietf.org>>,
>     "draft-xu-ospf-ipv6-router-id@tools.ietf.org
>     <mailto:draft-xu-ospf-ipv6-router-id@tools.ietf.org>"
>     <draft-xu-ospf-ipv6-router-id@tools.ietf.org
>     <mailto:draft-xu-ospf-ipv6-router-id@tools.ietf.org>>
>     *Cc: *"draft-fan-idr-ipv6-bgp-id@tools.ietf.org
>     <mailto:draft-fan-idr-ipv6-bgp-id@tools.ietf.org>"
>     <draft-fan-idr-ipv6-bgp-id@tools.ietf.org
>     <mailto:draft-fan-idr-ipv6-bgp-id@tools.ietf.org>>,
>     "sunset4@ietf.org <mailto:sunset4@ietf.org>" <sunset4@ietf.org
>     <mailto:sunset4@ietf.org>>
>     *Subject: *[sunset4] IPv6 router IDs
>=20
>     =20
>=20
>     I see that you have submitted two drafts for IPv6 router IDs in ISI=
S
>     and OSPF, noting that the existing router ID is only 4 octets. This=

>     has also come up in IDR for BGP. The authors of that draft are
>     copied. I=E2=80=99ll give you a similar set of feedback to what I g=
ave them -=20
>=20
>     =20
>=20
>     It is important to distinguish between places where a unique
>     identifier is needed, and by *convention* an IPv4 address assigned
>     to the device has been used to provide that unique ID, vs. places
>     where the actual IP address has some sort of importance to the
>     protocol (I.e. That information must be available to take action on=
).
>=20
>     In other words, is the protocol requirement that the ID be unique
>     across some domain, but that the actual value does not matter, or i=
s
>     the protocol requirement that the value must correspond to somethin=
g
>     on the router? In many of the former cases, the fact that the value=

>     isn=E2=80=99t relevant has been used to make recommendations that a=
re easier
>     for humans to deal with (I.e. Tying the router ID to an IP address)=

>     but that value as a human-readable set of info does not necessarily=

>     justify  changes to the protocol to support that convention as we
>     move to IPv6.=20
>=20
>     I would argue that the router ID used in routing protocols must
>     merely be unique, but it doesn=E2=80=99t have to be an IP address a=
t all.
>     Thus it is not strictly necessary to create a new field to carry
>     IPv6 addresses when operating without IPv4 addresses on a network.
>     If you believe otherwise, the justification needs to be documented
>     in the draft.=20
>=20
>     =20
>=20
>     There are many places in IETF protocols where a 32 bit unique
>     identifier is needed, and by convention an IPv4 address has been
>     used. It would be far more useful to write a general draft
>     identifying this problem and discussing several solutions, includin=
g
>     simply generating unique IDs manually, systematically generating a
>     random ID, etc.  the place for such a draft may be in Sunset4,
>     either as a part of the existing gap analysis draft or as another
>     standalone draft.=20
>=20
>     =20
>=20
>     There was rather a long discussion about this on IDR, thread
>     here: https://mailarchive.ietf.org/arch/search/?qdr=3Da&email_list=3D=
idr&q=3D%22%5Bidr%5D+%5Bv6ops%5D+BGP+Identifier%22&as=3D1&gbt=3D1
>=20
>     =20
>=20
>     And in the IDR meeting, minutes:
>=20
>     http://www.ietf.org/proceedings/89/minutes/minutes-89-idr (see page=
 11)
>=20
>     =20
>=20
>     I=E2=80=99d encourage the authors of these drafts to work together =
on this.
>=20
>     =20
>=20
>     Thanks,
>=20
>      =20
>=20
>     Wes George
>=20
>     =20
>=20
>     Anything below this line has been added by my company=E2=80=99s mai=
l server,
>     I have no control over it.
>=20
>     -----------
>=20
>     =20
>=20
>     -------------------------------------------------------------------=
-----
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>=20
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>=20
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From nobody Mon May  5 18:48:29 2014
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From: Xuxiaohu <xuxiaohu@huawei.com>
To: joel jaeggli <joelja@bogus.com>, Acee Lindem <acee.lindem@ericsson.com>, "George, Wes" <wesley.george@twcable.com>
Thread-Topic: [Isis-wg] [sunset4]   IPv6 router IDs
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Cc: "isis-wg@ietf.org" <isis-wg@ietf.org>, "George, Wes" <wesley.george@twcable.com>, "fanpeng@chinamobile.com" <fanpeng@chinamobile.com>, joel jaeggli <joelja@bogus.com>, OSPF List <ospf@ietf.org>, Acee Lindem <acee.lindem@ericsson.com>, "sunset4@ietf.org" <sunset4@ietf.org>, "lizhenqiang@chinamobile.com" <lizhenqiang@chinamobile.com>
Subject: Re: [sunset4] =?utf-8?b?W09TUEZdIOetlOWkjTogW0lzaXMtd2ddICAgIElQdjYg?= =?utf-8?q?router_IDs?=
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On May 5, 2014, at 9:48 PM, Xuxiaohu <xuxiaohu@huawei.com> wrote:

>=20
>=20
>> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
>> =E5=8F=91=E4=BB=B6=E4=BA=BA: Isis-wg =
[mailto:isis-wg-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 joel jaeggli
>> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2014=E5=B9=B45=E6=9C=885=E6=97=A5=
 23:55
>> =E6=94=B6=E4=BB=B6=E4=BA=BA: Acee Lindem; Xuxiaohu; George, Wes
>> =E6=8A=84=E9=80=81: ospf@ietf.org; fanpeng@chinamobile.com; =
isis-wg@ietf.org;
>> sunset4@ietf.org; lizhenqiang@chinamobile.com
>> =E4=B8=BB=E9=A2=98: Re: [Isis-wg] [sunset4] IPv6 router IDs
>>=20
>> On 5/5/14, 9:28 AM, Acee Lindem wrote:
>>> Xiaohu =E2=80=93 what are precisely the situations that you think =
you need
>>> this
>>> IPv6 address?
>>> Acee
>>=20
>> if you're using router-id's as equivalency as an ipv4 unicast =
addresses.
>> you're doing so at your peril because there is zero assurance that =
those actually
>> map. the first time you have a router id of
>> 11100000000000000000000000000101 well bummer.
>=20
> The IPv6 router ID sub-TLV of the ISIS router capability TLV must =
carry a "routable" IPv6 address. If the name of the sub-TLV seems =
confusing, it can be changed to IPv6 address sub-TLV.

Independent of what you call it, you didn=E2=80=99t answer my question. =
Other than TE, what the use cases where it is needed?=20

Acee=20


>=20
> Best regards,
> Xiaohu
>=20
>> I don't find the embedding of semantic meaning in router-ids to be =
more
>> compelling then it was in ip addresses.
>>=20
>>> From: Xuxiaohu <xuxiaohu@huawei.com <mailto:xuxiaohu@huawei.com>>
>>> Date: Sunday, May 4, 2014 1:29 AM
>>> To: "George, Wes" <wesley.george@twcable.com
>>> <mailto:wesley.george@twcable.com>>
>>> Cc: OSPF - OSPF WG List <ospf@ietf.org <mailto:ospf@ietf.org>>,
>>> "isis-wg@ietf.org <mailto:isis-wg@ietf.org>" <isis-wg@ietf.org
>>> <mailto:isis-wg@ietf.org>>, "fanpeng@chinamobile.com
>>> <mailto:fanpeng@chinamobile.com>" <fanpeng@chinamobile.com
>>> <mailto:fanpeng@chinamobile.com>>, "sunset4@ietf.org
>>> <mailto:sunset4@ietf.org>" <sunset4@ietf.org
>>> <mailto:sunset4@ietf.org>>, "lizhenqiang@chinamobile.com
>> <mailto:lizhenqiang@chinamobile.com>"
>>> <lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobile.com>>
>>> Subject: Re: [Isis-wg] [sunset4] IPv6 router IDs
>>>=20
>>>    Hi Wes,
>>>=20
>>>=20
>>>=20
>>>    Thanks for pointing out these two drafts.
>>>=20
>>>=20
>>>=20
>>>    The motivation for these two drafts
>>>    (http://tools.ietf.org/html/draft-xu-isis-ipv6-router-id-00 and
>>>    http://tools.ietf.org/html/draft-xu-ospf-ipv6-router-id-00) is =
very
>>>    simple: the IPv6 ISIS|OSPF capability TLV/RI-LSA which are used =
for
>>>    advertising router capabilities can be flooded across areas,
>>>    however, only a 4-octect router ID is carried in them. As a =
result,
>>>    it=E2=80=99s hard for routers in one area to establish =
correlations between
>>>    IPv6 addresses and capabilities of routers in another area. For
>>>    example, assume IS-IS router A in one area has established a =
L3VPN
>>>    session with IS-IS router B in another area over their own IPv6
>>>    addresses. When router A needs to send L3VPN traffic to router B =
via
>>>    a MPLS-SR tunnel, router A wants to know whether router B has the
>>>    ELC (http://tools.ietf.org/html/draft-xu-isis-mpls-elc-00) before
>>>    <http://tools.ietf.org/html/draft-xu-isis-mpls-elc-00)%20before>
>>>    inserting an EL into the MPLS-SR packet . However, the Capability
>>>    TLV originated by router B doesn=E2=80=99t carried an IPv6 =
address of its
>>>    own. As a result, it=E2=80=99s hard for router A to know the ELC =
of router B.
>>>=20
>>>=20
>>>=20
>>>    Best regards,
>>>=20
>>>    Xiaohu
>>>=20
>>>=20
>>>=20
>>>    *=E5=8F=91=E4=BB=B6=E4=BA=BA:*George, Wes =
[mailto:wesley.george@twcable.com]
>>>    *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:*2014=E5=B9=B45=E6=9C=882=E6=97=
=A51:51
>>>    *=E6=94=B6=E4=BB=B6=E4=BA=BA:*Xuxiaohu
>>>    *=E6=8A=84=E9=80=81:*sunset4@ietf.org <mailto:sunset4@ietf.org>;
>>>    fanpeng@chinamobile.com <mailto:fanpeng@chinamobile.com>;
>>>    lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobile.com>
>>>    *=E4=B8=BB=E9=A2=98:*Re: [sunset4] IPv6 router IDs
>>>=20
>>>=20
>>>=20
>>>    I got a bounce-back on all 3 draft aliases, trying again with the
>>>    authors=E2=80=99s email addresses directly.
>>>=20
>>>=20
>>>=20
>>>    *From: *<George>, "George, Wes" <wesley.george@twcable.com
>>>    <mailto:wesley.george@twcable.com>>
>>>    *Date: *Thursday, May 1, 2014 at 1:42 PM
>>>    *To: *"draft-xu-isis-ipv6-router-id@tools.ietf.org
>>>    <mailto:draft-xu-isis-ipv6-router-id@tools.ietf.org>"
>>>    <draft-xu-isis-ipv6-router-id@tools.ietf.org
>>>    <mailto:draft-xu-isis-ipv6-router-id@tools.ietf.org>>,
>>>    "draft-xu-ospf-ipv6-router-id@tools.ietf.org
>>>    <mailto:draft-xu-ospf-ipv6-router-id@tools.ietf.org>"
>>>    <draft-xu-ospf-ipv6-router-id@tools.ietf.org
>>>    <mailto:draft-xu-ospf-ipv6-router-id@tools.ietf.org>>
>>>    *Cc: *"draft-fan-idr-ipv6-bgp-id@tools.ietf.org
>>>    <mailto:draft-fan-idr-ipv6-bgp-id@tools.ietf.org>"
>>>    <draft-fan-idr-ipv6-bgp-id@tools.ietf.org
>>>    <mailto:draft-fan-idr-ipv6-bgp-id@tools.ietf.org>>,
>>>    "sunset4@ietf.org <mailto:sunset4@ietf.org>" <sunset4@ietf.org
>>>    <mailto:sunset4@ietf.org>>
>>>    *Subject: *[sunset4] IPv6 router IDs
>>>=20
>>>=20
>>>=20
>>>    I see that you have submitted two drafts for IPv6 router IDs in =
ISIS
>>>    and OSPF, noting that the existing router ID is only 4 octets. =
This
>>>    has also come up in IDR for BGP. The authors of that draft are
>>>    copied. I=E2=80=99ll give you a similar set of feedback to what I =
gave
>>> them -
>>>=20
>>>=20
>>>=20
>>>    It is important to distinguish between places where a unique
>>>    identifier is needed, and by *convention* an IPv4 address =
assigned
>>>    to the device has been used to provide that unique ID, vs. places
>>>    where the actual IP address has some sort of importance to the
>>>    protocol (I.e. That information must be available to take action =
on).
>>>=20
>>>    In other words, is the protocol requirement that the ID be unique
>>>    across some domain, but that the actual value does not matter, or =
is
>>>    the protocol requirement that the value must correspond to =
something
>>>    on the router? In many of the former cases, the fact that the =
value
>>>    isn=E2=80=99t relevant has been used to make recommendations that =
are easier
>>>    for humans to deal with (I.e. Tying the router ID to an IP =
address)
>>>    but that value as a human-readable set of info does not =
necessarily
>>>    justify  changes to the protocol to support that convention as we
>>>    move to IPv6.
>>>=20
>>>    I would argue that the router ID used in routing protocols must
>>>    merely be unique, but it doesn=E2=80=99t have to be an IP address =
at all.
>>>    Thus it is not strictly necessary to create a new field to carry
>>>    IPv6 addresses when operating without IPv4 addresses on a =
network.
>>>    If you believe otherwise, the justification needs to be =
documented
>>>    in the draft.
>>>=20
>>>=20
>>>=20
>>>    There are many places in IETF protocols where a 32 bit unique
>>>    identifier is needed, and by convention an IPv4 address has been
>>>    used. It would be far more useful to write a general draft
>>>    identifying this problem and discussing several solutions, =
including
>>>    simply generating unique IDs manually, systematically generating =
a
>>>    random ID, etc.  the place for such a draft may be in Sunset4,
>>>    either as a part of the existing gap analysis draft or as another
>>>    standalone draft.
>>>=20
>>>=20
>>>=20
>>>    There was rather a long discussion about this on IDR, thread
>>>    here:
>>> =
https://mailarchive.ietf.org/arch/search/?qdr=3Da&email_list=3Didr&q=3D%22=
%5
>>> Bidr%5D+%5Bv6ops%5D+BGP+Identifier%22&as=3D1&gbt=3D1
>>>=20
>>>=20
>>>=20
>>>    And in the IDR meeting, minutes:
>>>=20
>>>    http://www.ietf.org/proceedings/89/minutes/minutes-89-idr (see
>>> page 11)
>>>=20
>>>=20
>>>=20
>>>    I=E2=80=99d encourage the authors of these drafts to work =
together on this.
>>>=20
>>>=20
>>>=20
>>>    Thanks,
>>>=20
>>>=20
>>>=20
>>>    Wes George
>>>=20
>>>=20
>>>=20
>>>    Anything below this line has been added by my company=E2=80=99s =
mail server,
>>>    I have no control over it.
>>>=20
>>>    -----------
>>>=20
>>>=20
>>>=20
>>>=20
>>> =
----------------------------------------------------------------------
>>> --
>>>=20
>>>    This E-mail and any of its attachments may contain Time Warner =
Cable
>>>    proprietary information, which is privileged, confidential, or
>>>    subject to copyright belonging to Time Warner Cable. This E-mail =
is
>>>    intended solely for the use of the individual or entity to which =
it
>>>    is addressed. If you are not the intended recipient of this =
E-mail,
>>>    you are hereby notified that any dissemination, distribution,
>>>    copying, or action taken in relation to the contents of and
>>>    attachments to this E-mail is strictly prohibited and may be
>>>    unlawful. If you have received this E-mail in error, please =
notify
>>>    the sender immediately and permanently delete the original and =
any
>>>    copy of this E-mail and any printout.
>>>=20
>>>=20
>>>=20
>>> _______________________________________________
>>> sunset4 mailing list
>>> sunset4@ietf.org
>>> https://www.ietf.org/mailman/listinfo/sunset4
>>>=20
>>=20
>=20
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf


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To: Acee Lindem <acee@lindem.com>
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From nobody Fri May  9 01:58:17 2014
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Subject: Re: [sunset4] =?utf-8?b?W09TUEZdIOetlOWkjTogIOetlOWkjTogW0lzaXMtd2dd?= =?utf-8?q?____IPv6_router_IDs?=
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Hi Xiaohu,

I think I've understand your problem now, but please don't call it a 
Router ID, the router ID must not be an IP address.
To avoid any confusion about it please call it a router ip or router 
address within the TLV.
Please correct me if I'm wrong, but if I understand your drafts right 
you're not requesting a real IPv6 Router ID instead of the (arbitrary) 
32bit ID, but a simple TLV to carry the routable IPv6 address of the 
router which advertises the capability.

If I understand it right, we should maybe fix the text of the other rfc 
to refect that it is an routable IP address, instead of a (possible) 
arbitrary but unique Router ID.

Kind regards
Karsten

Am 09.05.2014 02:53, schrieb Xuxiaohu:
> Hi Anton,
>
> When ISIS capability TLVs are flooded across areas, routers in one area may need to establish correlations between IP addresses and capabilities of routers in another area. For example, assume IS-IS router A in one area has established a L3VPN session with IS-IS router B in another area. When router A needs to send L3VPN traffic to router B via a MPLS-SR tunnel, router A wants to know whether router B (identified by an IP address) has the ELC (http://tools.ietf.org/html/draft-xu-isis-mpls-elc-00) before inserting an EL into the MPLS-SR packet. In such case, it needs to contain at least one routable IP address in the capability TLV which has been flooded across area boundaries. In the IPv4 network, the 4-octect router ID field could contain such routable IPv4 address. However, in the IPv6 network, there is no counterpart field to contain a routable IPv6 address.
>
> Best regards,
> Xiaohu
>
>> -----邮件原件-----
>> 发件人: Anton Smirnov [mailto:asmirnov@cisco.com]
>> 发送时间: 2014年5月8日 22:49
>> 收件人: Xuxiaohu
>> 抄送: isis-wg@ietf.org; George, Wes; fanpeng@chinamobile.com; joel jaeggli;
>> OSPF List; sunset4@ietf.org; lizhenqiang@chinamobile.com
>> 主题: Re: [OSPF] 答复: 答复: [Isis-wg] [sunset4] IPv6 router IDs
>>
>>      Hello Xiaohu,
>>      this whole thread started from George Wes stating that even in pure
>> IPv4 world Router ID in many protocols is NOT an IPv4 address. For convenience
>> it frequently is but on the binary scale "ID guaranteed to be routable IPv4
>> address"/"ID is just a number" - the Router ID is NOT an IPv4 address.
>>
>>      So, before you convince people that IPv6 Rtr ID is needed you must start
>> from discussing when and why Router ID is being used as IPv4 address in pure
>> IPv4 world. I believe this in other words is what Acee asking you.
>>
>> Anton
>>
>>
>> On 05/07/2014 03:10 AM, Xuxiaohu wrote:
>>> Hi Acee,
>>>
>>> The motivation for these two drafts
>> (http://tools.ietf.org/html/draft-xu-isis-ipv6-router-id-00 and
>> http://tools.ietf.org/html/draft-xu-ospf-ipv6-router-id-00) is very simple: the
>> IPv6 ISIS|OSPF capability TLV/RI-LSA which are used for advertising router
>> capabilities can be flooded across areas, however, only a 4-octect router ID is
>> carried in them. As a result, it’s hard for routers in one area to establish
>> correlations between IPv6 addresses and capabilities of routers in another area.
>> For example, assume IS-IS router A in one area has established a L3VPN session
>> with IS-IS router B in another area over their own IPv6 addresses. When router
>> A needs to send L3VPN traffic to router B via a MPLS-SR tunnel, router A wants
>> to know whether router B has the ELC
>> (http://tools.ietf.org/html/draft-xu-isis-mpls-elc-00) before inserting an EL into
>> the MPLS-SR packet . However, the Capability TLV originated by router B
>> doesn’t carried an IPv6 address of its own. As a result, it !
>>   s hard fo
>> r router A to know the ELC of router B.
>>> Best regards,
>>> Xiaohu
>>>
>>>> -----邮件原件-----
>>>> 发件人: Acee Lindem [mailto:acee@lindem.com]
>>>> 发送时间: 2014年5月6日 21:14
>>>> 收件人: Xuxiaohu
>>>> 抄送: joel jaeggli; Acee Lindem; George, Wes; sunset4@ietf.org; OSPF
>>>> List; isis-wg@ietf.org; fanpeng@chinamobile.com;
>>>> lizhenqiang@chinamobile.com
>>>> 主题: Re: [OSPF] 答复: [Isis-wg] [sunset4] IPv6 router IDs
>>>>
>>>>
>>>> On May 5, 2014, at 9:48 PM, Xuxiaohu <xuxiaohu@huawei.com> wrote:
>>>>
>>>>>
>>>>>> -----邮件原件-----
>>>>>> 发件人: Isis-wg [mailto:isis-wg-bounces@ietf.org] 代表 joel jaeggli
>>>>>> 发送时间: 2014年5月5日 23:55
>>>>>> 收件人: Acee Lindem; Xuxiaohu; George, Wes
>>>>>> 抄送: ospf@ietf.org; fanpeng@chinamobile.com; isis-wg@ietf.org;
>>>>>> sunset4@ietf.org; lizhenqiang@chinamobile.com
>>>>>> 主题: Re: [Isis-wg] [sunset4] IPv6 router IDs
>>>>>>
>>>>>> On 5/5/14, 9:28 AM, Acee Lindem wrote:
>>>>>>> Xiaohu – what are precisely the situations that you think you need
>>>>>>> this
>>>>>>> IPv6 address?
>>>>>>> Acee
>>>>>> if you're using router-id's as equivalency as an ipv4 unicast addresses.
>>>>>> you're doing so at your peril because there is zero assurance that
>>>>>> those actually map. the first time you have a router id of
>>>>>> 11100000000000000000000000000101 well bummer.
>>>>> The IPv6 router ID sub-TLV of the ISIS router capability TLV must
>>>>> carry a
>>>> "routable" IPv6 address. If the name of the sub-TLV seems confusing,
>>>> it can be changed to IPv6 address sub-TLV.
>>>>
>>>> Independent of what you call it, you didn’t answer my question. Other
>>>> than TE, what the use cases where it is needed?
>>>>
>>>> Acee
>>>>
>>>>
>>>>> Best regards,
>>>>> Xiaohu
>>>>>
>>>>>> I don't find the embedding of semantic meaning in router-ids to be
>>>>>> more compelling then it was in ip addresses.
>>>>>>
>>>>>>> From: Xuxiaohu <xuxiaohu@huawei.com
>>>> <mailto:xuxiaohu@huawei.com>>
>>>>>>> Date: Sunday, May 4, 2014 1:29 AM
>>>>>>> To: "George, Wes" <wesley.george@twcable.com
>>>>>>> <mailto:wesley.george@twcable.com>>
>>>>>>> Cc: OSPF - OSPF WG List <ospf@ietf.org <mailto:ospf@ietf.org>>,
>>>>>>> "isis-wg@ietf.org <mailto:isis-wg@ietf.org>" <isis-wg@ietf.org
>>>>>>> <mailto:isis-wg@ietf.org>>, "fanpeng@chinamobile.com
>>>>>>> <mailto:fanpeng@chinamobile.com>" <fanpeng@chinamobile.com
>>>>>>> <mailto:fanpeng@chinamobile.com>>, "sunset4@ietf.org
>>>>>>> <mailto:sunset4@ietf.org>" <sunset4@ietf.org
>>>>>>> <mailto:sunset4@ietf.org>>, "lizhenqiang@chinamobile.com
>>>>>> <mailto:lizhenqiang@chinamobile.com>"
>>>>>>> <lizhenqiang@chinamobile.com
>> <mailto:lizhenqiang@chinamobile.com>>
>>>>>>> Subject: Re: [Isis-wg] [sunset4] IPv6 router IDs
>>>>>>>
>>>>>>>      Hi Wes,
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>      Thanks for pointing out these two drafts.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>      The motivation for these two drafts
>>>>>>>      (http://tools.ietf.org/html/draft-xu-isis-ipv6-router-id-00 and
>>>>>>>      http://tools.ietf.org/html/draft-xu-ospf-ipv6-router-id-00) is very
>>>>>>>      simple: the IPv6 ISIS|OSPF capability TLV/RI-LSA which are used for
>>>>>>>      advertising router capabilities can be flooded across areas,
>>>>>>>      however, only a 4-octect router ID is carried in them. As a result,
>>>>>>>      it’s hard for routers in one area to establish correlations between
>>>>>>>      IPv6 addresses and capabilities of routers in another area. For
>>>>>>>      example, assume IS-IS router A in one area has established a L3VPN
>>>>>>>      session with IS-IS router B in another area over their own IPv6
>>>>>>>      addresses. When router A needs to send L3VPN traffic to router B
>> via
>>>>>>>      a MPLS-SR tunnel, router A wants to know whether router B has
>> the
>>>>>>>      ELC (http://tools.ietf.org/html/draft-xu-isis-mpls-elc-00) before
>>>>>>>      <http://tools.ietf.org/html/draft-xu-isis-mpls-elc-00)%20before>
>>>>>>>      inserting an EL into the MPLS-SR packet . However, the Capability
>>>>>>>      TLV originated by router B doesn’t carried an IPv6 address of its
>>>>>>>      own. As a result, it’s hard for router A to know the ELC of router B.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>      Best regards,
>>>>>>>
>>>>>>>      Xiaohu
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>      *发件人:*George, Wes [mailto:wesley.george@twcable.com]
>>>>>>>      *发送时间:*2014年5月2日1:51
>>>>>>>      *收件人:*Xuxiaohu
>>>>>>>      *抄送:*sunset4@ietf.org <mailto:sunset4@ietf.org>;
>>>>>>>      fanpeng@chinamobile.com <mailto:fanpeng@chinamobile.com>;
>>>>>>>      lizhenqiang@chinamobile.com
>> <mailto:lizhenqiang@chinamobile.com>
>>>>>>>      *主题:*Re: [sunset4] IPv6 router IDs
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>      I got a bounce-back on all 3 draft aliases, trying again with the
>>>>>>>      authors’s email addresses directly.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>      *From: *<George>, "George, Wes" <wesley.george@twcable.com
>>>>>>>      <mailto:wesley.george@twcable.com>>
>>>>>>>      *Date: *Thursday, May 1, 2014 at 1:42 PM
>>>>>>>      *To: *"draft-xu-isis-ipv6-router-id@tools.ietf.org
>>>>>>>      <mailto:draft-xu-isis-ipv6-router-id@tools.ietf.org>"
>>>>>>>      <draft-xu-isis-ipv6-router-id@tools.ietf.org
>>>>>>>      <mailto:draft-xu-isis-ipv6-router-id@tools.ietf.org>>,
>>>>>>>      "draft-xu-ospf-ipv6-router-id@tools.ietf.org
>>>>>>>      <mailto:draft-xu-ospf-ipv6-router-id@tools.ietf.org>"
>>>>>>>      <draft-xu-ospf-ipv6-router-id@tools.ietf.org
>>>>>>>      <mailto:draft-xu-ospf-ipv6-router-id@tools.ietf.org>>
>>>>>>>      *Cc: *"draft-fan-idr-ipv6-bgp-id@tools.ietf.org
>>>>>>>      <mailto:draft-fan-idr-ipv6-bgp-id@tools.ietf.org>"
>>>>>>>      <draft-fan-idr-ipv6-bgp-id@tools.ietf.org
>>>>>>>      <mailto:draft-fan-idr-ipv6-bgp-id@tools.ietf.org>>,
>>>>>>>      "sunset4@ietf.org <mailto:sunset4@ietf.org>" <sunset4@ietf.org
>>>>>>>      <mailto:sunset4@ietf.org>>
>>>>>>>      *Subject: *[sunset4] IPv6 router IDs
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>      I see that you have submitted two drafts for IPv6 router IDs in ISIS
>>>>>>>      and OSPF, noting that the existing router ID is only 4 octets. This
>>>>>>>      has also come up in IDR for BGP. The authors of that draft are
>>>>>>>      copied. I’ll give you a similar set of feedback to what I gave
>>>>>>> them -
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>      It is important to distinguish between places where a unique
>>>>>>>      identifier is needed, and by *convention* an IPv4 address assigned
>>>>>>>      to the device has been used to provide that unique ID, vs. places
>>>>>>>      where the actual IP address has some sort of importance to the
>>>>>>>      protocol (I.e. That information must be available to take action on).
>>>>>>>
>>>>>>>      In other words, is the protocol requirement that the ID be unique
>>>>>>>      across some domain, but that the actual value does not matter, or is
>>>>>>>      the protocol requirement that the value must correspond to
>> something
>>>>>>>      on the router? In many of the former cases, the fact that the value
>>>>>>>      isn’t relevant has been used to make recommendations that are
>> easier
>>>>>>>      for humans to deal with (I.e. Tying the router ID to an IP address)
>>>>>>>      but that value as a human-readable set of info does not necessarily
>>>>>>>      justify  changes to the protocol to support that convention as we
>>>>>>>      move to IPv6.
>>>>>>>
>>>>>>>      I would argue that the router ID used in routing protocols must
>>>>>>>      merely be unique, but it doesn’t have to be an IP address at all.
>>>>>>>      Thus it is not strictly necessary to create a new field to carry
>>>>>>>      IPv6 addresses when operating without IPv4 addresses on a
>> network.
>>>>>>>      If you believe otherwise, the justification needs to be documented
>>>>>>>      in the draft.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>      There are many places in IETF protocols where a 32 bit unique
>>>>>>>      identifier is needed, and by convention an IPv4 address has been
>>>>>>>      used. It would be far more useful to write a general draft
>>>>>>>      identifying this problem and discussing several solutions, including
>>>>>>>      simply generating unique IDs manually, systematically generating a
>>>>>>>      random ID, etc.  the place for such a draft may be in Sunset4,
>>>>>>>      either as a part of the existing gap analysis draft or as another
>>>>>>>      standalone draft.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>      There was rather a long discussion about this on IDR, thread
>>>>>>>      here:
>>>>>>> https://mailarchive.ietf.org/arch/search/?qdr=a&email_list=idr&q=%
>>>>>>> 22
>>>>>>> %5
>>>>>>> Bidr%5D+%5Bv6ops%5D+BGP+Identifier%22&as=1&gbt=1
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>      And in the IDR meeting, minutes:
>>>>>>>
>>>>>>>      http://www.ietf.org/proceedings/89/minutes/minutes-89-idr (see
>>>>>>> page 11)
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>      I’d encourage the authors of these drafts to work together on this.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>      Thanks,
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>      Wes George
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>      Anything below this line has been added by my company’s mail
>> server,
>>>>>>>      I have no control over it.
>>>>>>>
>>>>>>>      -----------
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> ------------------------------------------------------------------
>>>>>>> --
>>>>>>> --
>>>>>>> --
>>>>>>>
>>>>>>>      This E-mail and any of its attachments may contain Time Warner
>> Cable
>>>>>>>      proprietary information, which is privileged, confidential, or
>>>>>>>      subject to copyright belonging to Time Warner Cable. This E-mail is
>>>>>>>      intended solely for the use of the individual or entity to which it
>>>>>>>      is addressed. If you are not the intended recipient of this E-mail,
>>>>>>>      you are hereby notified that any dissemination, distribution,
>>>>>>>      copying, or action taken in relation to the contents of and
>>>>>>>      attachments to this E-mail is strictly prohibited and may be
>>>>>>>      unlawful. If you have received this E-mail in error, please notify
>>>>>>>      the sender immediately and permanently delete the original and
>> any
>>>>>>>      copy of this E-mail and any printout.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> sunset4 mailing list
>>>>>>> sunset4@ietf.org
>>>>>>> https://www.ietf.org/mailman/listinfo/sunset4
>>>>>>>
>>>>> _______________________________________________
>>>>> OSPF mailing list
>>>>> OSPF@ietf.org
>>>>> https://www.ietf.org/mailman/listinfo/ospf
>>> _______________________________________________
>>> OSPF mailing list
>>> OSPF@ietf.org
>>> https://www.ietf.org/mailman/listinfo/ospf
>>>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf


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To: Karsten Thomann <karsten_thomann@linfre.de>, Anton Smirnov <asmirnov@cisco.com>
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From nobody Fri May  9 02:49:49 2014
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Date: Fri, 09 May 2014 11:49:30 +0200
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Subject: Re: [sunset4] =?utf-8?b?W0lzaXMtd2ddIFtPU1BGXSDnrZTlpI06ICDnrZTlpI06?= =?utf-8?q?_____IPv6_router_IDs?=
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Hi Xuxiaohu,

I think that the question of the purpose of the drafts is clear now and 
I hope George can confirm it.
The problem I would like to get addressed is the term Router ID in the 
drafts, as the Router ID is not necessarily a routable address, if 
possible with an update to the rfc also for the IPv4 "Router ID" in the 
TLV...

Or do you (or someone else) have any objections or problems with a 
change of the term to clarify that it is not the router ID?

Kind regards

Am 09.05.2014 11:31, schrieb Xuxiaohu:
> Hi Karsten,
>
> Your understanding is completely correct.
>
> Best regards,
> Xiaohu
>
>> -----邮件原件-----
>> 发件人: Isis-wg [mailto:isis-wg-bounces@ietf.org] 代表 Karsten Thomann
>> 发送时间: 2014年5月9日 16:58
>> 收件人: Xuxiaohu; Anton Smirnov
>> 抄送: isis-wg@ietf.org; George, Wes; fanpeng@chinamobile.com; joel jaeggli;
>> OSPF List; sunset4@ietf.org; lizhenqiang@chinamobile.com
>> 主题: Re: [Isis-wg] [OSPF] 答复: 答复: [sunset4] IPv6 router IDs
>>
>> Hi Xiaohu,
>>
>> I think I've understand your problem now, but please don't call it a Router ID, the
>> router ID must not be an IP address.
>> To avoid any confusion about it please call it a router ip or router address within
>> the TLV.
>> Please correct me if I'm wrong, but if I understand your drafts right you're not
>> requesting a real IPv6 Router ID instead of the (arbitrary) 32bit ID, but a simple
>> TLV to carry the routable IPv6 address of the router which advertises the
>> capability.
>>
>> If I understand it right, we should maybe fix the text of the other rfc to refect
>> that it is an routable IP address, instead of a (possible) arbitrary but unique
>> Router ID.
>>
>> Kind regards
>> Karsten
>>
>> Am 09.05.2014 02:53, schrieb Xuxiaohu:
>>> Hi Anton,
>>>
>>> When ISIS capability TLVs are flooded across areas, routers in one area may
>> need to establish correlations between IP addresses and capabilities of routers in
>> another area. For example, assume IS-IS router A in one area has established a
>> L3VPN session with IS-IS router B in another area. When router A needs to send
>> L3VPN traffic to router B via a MPLS-SR tunnel, router A wants to know whether
>> router B (identified by an IP address) has the ELC
>> (http://tools.ietf.org/html/draft-xu-isis-mpls-elc-00) before inserting an EL into
>> the MPLS-SR packet. In such case, it needs to contain at least one routable IP
>> address in the capability TLV which has been flooded across area boundaries. In
>> the IPv4 network, the 4-octect router ID field could contain such routable IPv4
>> address. However, in the IPv6 network, there is no counterpart field to contain a
>> routable IPv6 address.
>>> Best regards,
>>> Xiaohu
>>>
>>>> -----邮件原件-----
>>>> 发件人: Anton Smirnov [mailto:asmirnov@cisco.com]
>>>> 发送时间: 2014年5月8日 22:49
>>>> 收件人: Xuxiaohu
>>>> 抄送: isis-wg@ietf.org; George, Wes; fanpeng@chinamobile.com; joel
>>>> jaeggli; OSPF List; sunset4@ietf.org; lizhenqiang@chinamobile.com
>>>> 主题: Re: [OSPF] 答复: 答复: [Isis-wg] [sunset4] IPv6 router IDs
>>>>
>>>>       Hello Xiaohu,
>>>>       this whole thread started from George Wes stating that even in
>>>> pure
>>>> IPv4 world Router ID in many protocols is NOT an IPv4 address. For
>>>> convenience it frequently is but on the binary scale "ID guaranteed
>>>> to be routable IPv4 address"/"ID is just a number" - the Router ID is NOT an
>> IPv4 address.
>>>>       So, before you convince people that IPv6 Rtr ID is needed you
>>>> must start from discussing when and why Router ID is being used as
>>>> IPv4 address in pure
>>>> IPv4 world. I believe this in other words is what Acee asking you.
>>>>
>>>> Anton
>>>>
>>>>
>>>> On 05/07/2014 03:10 AM, Xuxiaohu wrote:
>>>>> Hi Acee,
>>>>>
>>>>> The motivation for these two drafts
>>>> (http://tools.ietf.org/html/draft-xu-isis-ipv6-router-id-00 and
>>>> http://tools.ietf.org/html/draft-xu-ospf-ipv6-router-id-00) is very
>>>> simple: the
>>>> IPv6 ISIS|OSPF capability TLV/RI-LSA which are used for advertising
>>>> router capabilities can be flooded across areas, however, only a
>>>> 4-octect router ID is carried in them. As a result, it’s hard for
>>>> routers in one area to establish correlations between IPv6 addresses and
>> capabilities of routers in another area.
>>>> For example, assume IS-IS router A in one area has established a
>>>> L3VPN session with IS-IS router B in another area over their own IPv6
>>>> addresses. When router A needs to send L3VPN traffic to router B via
>>>> a MPLS-SR tunnel, router A wants to know whether router B has the ELC
>>>> (http://tools.ietf.org/html/draft-xu-isis-mpls-elc-00) before
>>>> inserting an EL into the MPLS-SR packet . However, the Capability TLV
>>>> originated by router B doesn’t carried an IPv6 address of its own. As a result,
>> it !
>>>>    s hard fo
>>>> r router A to know the ELC of router B.
>>>>> Best regards,
>>>>> Xiaohu
>>>>>
>>>>>> -----邮件原件-----
>>>>>> 发件人: Acee Lindem [mailto:acee@lindem.com]
>>>>>> 发送时间: 2014年5月6日 21:14
>>>>>> 收件人: Xuxiaohu
>>>>>> 抄送: joel jaeggli; Acee Lindem; George, Wes; sunset4@ietf.org; OSPF
>>>>>> List; isis-wg@ietf.org; fanpeng@chinamobile.com;
>>>>>> lizhenqiang@chinamobile.com
>>>>>> 主题: Re: [OSPF] 答复: [Isis-wg] [sunset4] IPv6 router IDs
>>>>>>
>>>>>>
>>>>>> On May 5, 2014, at 9:48 PM, Xuxiaohu <xuxiaohu@huawei.com> wrote:
>>>>>>
>>>>>>>> -----邮件原件-----
>>>>>>>> 发件人: Isis-wg [mailto:isis-wg-bounces@ietf.org] 代表 joel jaeggli
>>>>>>>> 发送时间: 2014年5月5日 23:55
>>>>>>>> 收件人: Acee Lindem; Xuxiaohu; George, Wes
>>>>>>>> 抄送: ospf@ietf.org; fanpeng@chinamobile.com; isis-wg@ietf.org;
>>>>>>>> sunset4@ietf.org; lizhenqiang@chinamobile.com
>>>>>>>> 主题: Re: [Isis-wg] [sunset4] IPv6 router IDs
>>>>>>>>
>>>>>>>> On 5/5/14, 9:28 AM, Acee Lindem wrote:
>>>>>>>>> Xiaohu – what are precisely the situations that you think you
>>>>>>>>> need this
>>>>>>>>> IPv6 address?
>>>>>>>>> Acee
>>>>>>>> if you're using router-id's as equivalency as an ipv4 unicast addresses.
>>>>>>>> you're doing so at your peril because there is zero assurance
>>>>>>>> that those actually map. the first time you have a router id of
>>>>>>>> 11100000000000000000000000000101 well bummer.
>>>>>>> The IPv6 router ID sub-TLV of the ISIS router capability TLV must
>>>>>>> carry a
>>>>>> "routable" IPv6 address. If the name of the sub-TLV seems
>>>>>> confusing, it can be changed to IPv6 address sub-TLV.
>>>>>>
>>>>>> Independent of what you call it, you didn’t answer my question.
>>>>>> Other than TE, what the use cases where it is needed?
>>>>>>
>>>>>> Acee
>>>>>>
>>>>>>
>>>>>>> Best regards,
>>>>>>> Xiaohu
>>>>>>>
>>>>>>>> I don't find the embedding of semantic meaning in router-ids to
>>>>>>>> be more compelling then it was in ip addresses.
>>>>>>>>
>>>>>>>>> From: Xuxiaohu <xuxiaohu@huawei.com
>>>>>> <mailto:xuxiaohu@huawei.com>>
>>>>>>>>> Date: Sunday, May 4, 2014 1:29 AM
>>>>>>>>> To: "George, Wes" <wesley.george@twcable.com
>>>>>>>>> <mailto:wesley.george@twcable.com>>
>>>>>>>>> Cc: OSPF - OSPF WG List <ospf@ietf.org <mailto:ospf@ietf.org>>,
>>>>>>>>> "isis-wg@ietf.org <mailto:isis-wg@ietf.org>" <isis-wg@ietf.org
>>>>>>>>> <mailto:isis-wg@ietf.org>>, "fanpeng@chinamobile.com
>>>>>>>>> <mailto:fanpeng@chinamobile.com>" <fanpeng@chinamobile.com
>>>>>>>>> <mailto:fanpeng@chinamobile.com>>, "sunset4@ietf.org
>>>>>>>>> <mailto:sunset4@ietf.org>" <sunset4@ietf.org
>>>>>>>>> <mailto:sunset4@ietf.org>>, "lizhenqiang@chinamobile.com
>>>>>>>> <mailto:lizhenqiang@chinamobile.com>"
>>>>>>>>> <lizhenqiang@chinamobile.com
>>>> <mailto:lizhenqiang@chinamobile.com>>
>>>>>>>>> Subject: Re: [Isis-wg] [sunset4] IPv6 router IDs
>>>>>>>>>
>>>>>>>>>       Hi Wes,
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>       Thanks for pointing out these two drafts.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>       The motivation for these two drafts
>>>>>>>>>       (http://tools.ietf.org/html/draft-xu-isis-ipv6-router-id-00 and
>>>>>>>>>       http://tools.ietf.org/html/draft-xu-ospf-ipv6-router-id-00) is
>> very
>>>>>>>>>       simple: the IPv6 ISIS|OSPF capability TLV/RI-LSA which are used
>> for
>>>>>>>>>       advertising router capabilities can be flooded across areas,
>>>>>>>>>       however, only a 4-octect router ID is carried in them. As a result,
>>>>>>>>>       it’s hard for routers in one area to establish correlations
>> between
>>>>>>>>>       IPv6 addresses and capabilities of routers in another area. For
>>>>>>>>>       example, assume IS-IS router A in one area has established a
>> L3VPN
>>>>>>>>>       session with IS-IS router B in another area over their own IPv6
>>>>>>>>>       addresses. When router A needs to send L3VPN traffic to
>>>>>>>>> router B
>>>> via
>>>>>>>>>       a MPLS-SR tunnel, router A wants to know whether router B
>>>>>>>>> has
>>>> the
>>>>>>>>>       ELC (http://tools.ietf.org/html/draft-xu-isis-mpls-elc-00) before
>>>>>>>>>
>> <http://tools.ietf.org/html/draft-xu-isis-mpls-elc-00)%20before>
>>>>>>>>>       inserting an EL into the MPLS-SR packet . However, the
>> Capability
>>>>>>>>>       TLV originated by router B doesn’t carried an IPv6 address of its
>>>>>>>>>       own. As a result, it’s hard for router A to know the ELC of
>> router B.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>       Best regards,
>>>>>>>>>
>>>>>>>>>       Xiaohu
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>       *发件人:*George, Wes [mailto:wesley.george@twcable.com]
>>>>>>>>>       *发送时间:*2014年5月2日1:51
>>>>>>>>>       *收件人:*Xuxiaohu
>>>>>>>>>       *抄送:*sunset4@ietf.org <mailto:sunset4@ietf.org>;
>>>>>>>>>       fanpeng@chinamobile.com
>> <mailto:fanpeng@chinamobile.com>;
>>>>>>>>>       lizhenqiang@chinamobile.com
>>>> <mailto:lizhenqiang@chinamobile.com>
>>>>>>>>>       *主题:*Re: [sunset4] IPv6 router IDs
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>       I got a bounce-back on all 3 draft aliases, trying again with the
>>>>>>>>>       authors’s email addresses directly.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>       *From: *<George>, "George, Wes"
>> <wesley.george@twcable.com
>>>>>>>>>       <mailto:wesley.george@twcable.com>>
>>>>>>>>>       *Date: *Thursday, May 1, 2014 at 1:42 PM
>>>>>>>>>       *To: *"draft-xu-isis-ipv6-router-id@tools.ietf.org
>>>>>>>>>       <mailto:draft-xu-isis-ipv6-router-id@tools.ietf.org>"
>>>>>>>>>       <draft-xu-isis-ipv6-router-id@tools.ietf.org
>>>>>>>>>       <mailto:draft-xu-isis-ipv6-router-id@tools.ietf.org>>,
>>>>>>>>>       "draft-xu-ospf-ipv6-router-id@tools.ietf.org
>>>>>>>>>       <mailto:draft-xu-ospf-ipv6-router-id@tools.ietf.org>"
>>>>>>>>>       <draft-xu-ospf-ipv6-router-id@tools.ietf.org
>>>>>>>>>       <mailto:draft-xu-ospf-ipv6-router-id@tools.ietf.org>>
>>>>>>>>>       *Cc: *"draft-fan-idr-ipv6-bgp-id@tools.ietf.org
>>>>>>>>>       <mailto:draft-fan-idr-ipv6-bgp-id@tools.ietf.org>"
>>>>>>>>>       <draft-fan-idr-ipv6-bgp-id@tools.ietf.org
>>>>>>>>>       <mailto:draft-fan-idr-ipv6-bgp-id@tools.ietf.org>>,
>>>>>>>>>       "sunset4@ietf.org <mailto:sunset4@ietf.org>"
>> <sunset4@ietf.org
>>>>>>>>>       <mailto:sunset4@ietf.org>>
>>>>>>>>>       *Subject: *[sunset4] IPv6 router IDs
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>       I see that you have submitted two drafts for IPv6 router IDs in
>> ISIS
>>>>>>>>>       and OSPF, noting that the existing router ID is only 4 octets. This
>>>>>>>>>       has also come up in IDR for BGP. The authors of that draft are
>>>>>>>>>       copied. I’ll give you a similar set of feedback to what I
>>>>>>>>> gave them -
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>       It is important to distinguish between places where a unique
>>>>>>>>>       identifier is needed, and by *convention* an IPv4 address
>> assigned
>>>>>>>>>       to the device has been used to provide that unique ID, vs. places
>>>>>>>>>       where the actual IP address has some sort of importance to the
>>>>>>>>>       protocol (I.e. That information must be available to take action
>> on).
>>>>>>>>>       In other words, is the protocol requirement that the ID be
>> unique
>>>>>>>>>       across some domain, but that the actual value does not matter,
>> or is
>>>>>>>>>       the protocol requirement that the value must correspond to
>>>> something
>>>>>>>>>       on the router? In many of the former cases, the fact that the
>> value
>>>>>>>>>       isn’t relevant has been used to make recommendations that
>>>>>>>>> are
>>>> easier
>>>>>>>>>       for humans to deal with (I.e. Tying the router ID to an IP
>> address)
>>>>>>>>>       but that value as a human-readable set of info does not
>> necessarily
>>>>>>>>>       justify  changes to the protocol to support that convention as
>> we
>>>>>>>>>       move to IPv6.
>>>>>>>>>
>>>>>>>>>       I would argue that the router ID used in routing protocols must
>>>>>>>>>       merely be unique, but it doesn’t have to be an IP address at all.
>>>>>>>>>       Thus it is not strictly necessary to create a new field to carry
>>>>>>>>>       IPv6 addresses when operating without IPv4 addresses on a
>>>> network.
>>>>>>>>>       If you believe otherwise, the justification needs to be
>> documented
>>>>>>>>>       in the draft.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>       There are many places in IETF protocols where a 32 bit unique
>>>>>>>>>       identifier is needed, and by convention an IPv4 address has
>> been
>>>>>>>>>       used. It would be far more useful to write a general draft
>>>>>>>>>       identifying this problem and discussing several solutions,
>> including
>>>>>>>>>       simply generating unique IDs manually, systematically
>> generating a
>>>>>>>>>       random ID, etc.  the place for such a draft may be in Sunset4,
>>>>>>>>>       either as a part of the existing gap analysis draft or as another
>>>>>>>>>       standalone draft.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>       There was rather a long discussion about this on IDR, thread
>>>>>>>>>       here:
>>>>>>>>> https://mailarchive.ietf.org/arch/search/?qdr=a&email_list=idr&q
>>>>>>>>> =%
>>>>>>>>> 22
>>>>>>>>> %5
>>>>>>>>> Bidr%5D+%5Bv6ops%5D+BGP+Identifier%22&as=1&gbt=1
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>       And in the IDR meeting, minutes:
>>>>>>>>>
>>>>>>>>>       http://www.ietf.org/proceedings/89/minutes/minutes-89-idr
>>>>>>>>> (see page 11)
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>       I’d encourage the authors of these drafts to work together on
>> this.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>       Thanks,
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>       Wes George
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>       Anything below this line has been added by my company’s
>>>>>>>>> mail
>>>> server,
>>>>>>>>>       I have no control over it.
>>>>>>>>>
>>>>>>>>>       -----------
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> ----------------------------------------------------------------
>>>>>>>>> --
>>>>>>>>> --
>>>>>>>>> --
>>>>>>>>> --
>>>>>>>>>
>>>>>>>>>       This E-mail and any of its attachments may contain Time
>>>>>>>>> Warner
>>>> Cable
>>>>>>>>>       proprietary information, which is privileged, confidential, or
>>>>>>>>>       subject to copyright belonging to Time Warner Cable. This
>> E-mail is
>>>>>>>>>       intended solely for the use of the individual or entity to which it
>>>>>>>>>       is addressed. If you are not the intended recipient of this E-mail,
>>>>>>>>>       you are hereby notified that any dissemination, distribution,
>>>>>>>>>       copying, or action taken in relation to the contents of and
>>>>>>>>>       attachments to this E-mail is strictly prohibited and may be
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>>>>>>>>>       the sender immediately and permanently delete the original
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>>>>>>>>>       copy of this E-mail and any printout.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> sunset4 mailing list
>>>>>>>>> sunset4@ietf.org
>>>>>>>>> https://www.ietf.org/mailman/listinfo/sunset4
>>>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> OSPF mailing list
>>>>>>> OSPF@ietf.org
>>>>>>> https://www.ietf.org/mailman/listinfo/ospf
>>>>> _______________________________________________
>>>>> OSPF mailing list
>>>>> OSPF@ietf.org
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>>>>>
>>> _______________________________________________
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From: Uma Chunduri <uma.chunduri@ericsson.com>
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Date: Thu, 08 May 2014 16:49:21 +0200
From: Anton Smirnov <asmirnov@cisco.com>
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Cc: "isis-wg@ietf.org" <isis-wg@ietf.org>, "fanpeng@chinamobile.com" <fanpeng@chinamobile.com>, "George, Wes" <wesley.george@twcable.com>, joel jaeggli <joelja@bogus.com>, OSPF List <ospf@ietf.org>, "sunset4@ietf.org" <sunset4@ietf.org>, "lizhenqiang@chinamobile.com" <lizhenqiang@chinamobile.com>
Subject: Re: [sunset4] =?utf-8?b?W09TUEZdIOetlOWkjTogIOetlOWkjTogW0lzaXMtd2dd?= =?utf-8?q?____IPv6_router_IDs?=
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    Hello Xiaohu,
    this whole thread started from George Wes stating that even in pure 
IPv4 world Router ID in many protocols is NOT an IPv4 address. For 
convenience it frequently is but on the binary scale "ID guaranteed to 
be routable IPv4 address"/"ID is just a number" - the Router ID is NOT 
an IPv4 address.

    So, before you convince people that IPv6 Rtr ID is needed you must 
start from discussing when and why Router ID is being used as IPv4 
address in pure IPv4 world. I believe this in other words is what Acee 
asking you.

Anton


On 05/07/2014 03:10 AM, Xuxiaohu wrote:
> Hi Acee,
>
> The motivation for these two drafts (http://tools.ietf.org/html/draft-xu-isis-ipv6-router-id-00 and http://tools.ietf.org/html/draft-xu-ospf-ipv6-router-id-00) is very simple: the IPv6 ISIS|OSPF capability TLV/RI-LSA which are used for advertising router capabilities can be flooded across areas, however, only a 4-octect router ID is carried in them. As a result, it’s hard for routers in one area to establish correlations between IPv6 addresses and capabilities of routers in another area. For example, assume IS-IS router A in one area has established a L3VPN session with IS-IS router B in another area over their own IPv6 addresses. When router A needs to send L3VPN traffic to router B via a MPLS-SR tunnel, router A wants to know whether router B has the ELC (http://tools.ietf.org/html/draft-xu-isis-mpls-elc-00) before inserting an EL into the MPLS-SR packet . However, the Capability TLV originated by router B doesn’t carried an IPv6 address of its own. As a result, it’s hard f
 o
r router A to know the ELC of router B.
>
> Best regards,
> Xiaohu
>
>> -----邮件原件-----
>> 发件人: Acee Lindem [mailto:acee@lindem.com]
>> 发送时间: 2014年5月6日 21:14
>> 收件人: Xuxiaohu
>> 抄送: joel jaeggli; Acee Lindem; George, Wes; sunset4@ietf.org; OSPF List;
>> isis-wg@ietf.org; fanpeng@chinamobile.com; lizhenqiang@chinamobile.com
>> 主题: Re: [OSPF] 答复: [Isis-wg] [sunset4] IPv6 router IDs
>>
>>
>> On May 5, 2014, at 9:48 PM, Xuxiaohu <xuxiaohu@huawei.com> wrote:
>>
>>>
>>>
>>>> -----邮件原件-----
>>>> 发件人: Isis-wg [mailto:isis-wg-bounces@ietf.org] 代表 joel jaeggli
>>>> 发送时间: 2014年5月5日 23:55
>>>> 收件人: Acee Lindem; Xuxiaohu; George, Wes
>>>> 抄送: ospf@ietf.org; fanpeng@chinamobile.com; isis-wg@ietf.org;
>>>> sunset4@ietf.org; lizhenqiang@chinamobile.com
>>>> 主题: Re: [Isis-wg] [sunset4] IPv6 router IDs
>>>>
>>>> On 5/5/14, 9:28 AM, Acee Lindem wrote:
>>>>> Xiaohu – what are precisely the situations that you think you need
>>>>> this
>>>>> IPv6 address?
>>>>> Acee
>>>>
>>>> if you're using router-id's as equivalency as an ipv4 unicast addresses.
>>>> you're doing so at your peril because there is zero assurance that
>>>> those actually map. the first time you have a router id of
>>>> 11100000000000000000000000000101 well bummer.
>>>
>>> The IPv6 router ID sub-TLV of the ISIS router capability TLV must carry a
>> "routable" IPv6 address. If the name of the sub-TLV seems confusing, it can be
>> changed to IPv6 address sub-TLV.
>>
>> Independent of what you call it, you didn’t answer my question. Other than TE,
>> what the use cases where it is needed?
>>
>> Acee
>>
>>
>>>
>>> Best regards,
>>> Xiaohu
>>>
>>>> I don't find the embedding of semantic meaning in router-ids to be
>>>> more compelling then it was in ip addresses.
>>>>
>>>>> From: Xuxiaohu <xuxiaohu@huawei.com
>> <mailto:xuxiaohu@huawei.com>>
>>>>> Date: Sunday, May 4, 2014 1:29 AM
>>>>> To: "George, Wes" <wesley.george@twcable.com
>>>>> <mailto:wesley.george@twcable.com>>
>>>>> Cc: OSPF - OSPF WG List <ospf@ietf.org <mailto:ospf@ietf.org>>,
>>>>> "isis-wg@ietf.org <mailto:isis-wg@ietf.org>" <isis-wg@ietf.org
>>>>> <mailto:isis-wg@ietf.org>>, "fanpeng@chinamobile.com
>>>>> <mailto:fanpeng@chinamobile.com>" <fanpeng@chinamobile.com
>>>>> <mailto:fanpeng@chinamobile.com>>, "sunset4@ietf.org
>>>>> <mailto:sunset4@ietf.org>" <sunset4@ietf.org
>>>>> <mailto:sunset4@ietf.org>>, "lizhenqiang@chinamobile.com
>>>> <mailto:lizhenqiang@chinamobile.com>"
>>>>> <lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobile.com>>
>>>>> Subject: Re: [Isis-wg] [sunset4] IPv6 router IDs
>>>>>
>>>>>     Hi Wes,
>>>>>
>>>>>
>>>>>
>>>>>     Thanks for pointing out these two drafts.
>>>>>
>>>>>
>>>>>
>>>>>     The motivation for these two drafts
>>>>>     (http://tools.ietf.org/html/draft-xu-isis-ipv6-router-id-00 and
>>>>>     http://tools.ietf.org/html/draft-xu-ospf-ipv6-router-id-00) is very
>>>>>     simple: the IPv6 ISIS|OSPF capability TLV/RI-LSA which are used for
>>>>>     advertising router capabilities can be flooded across areas,
>>>>>     however, only a 4-octect router ID is carried in them. As a result,
>>>>>     it’s hard for routers in one area to establish correlations between
>>>>>     IPv6 addresses and capabilities of routers in another area. For
>>>>>     example, assume IS-IS router A in one area has established a L3VPN
>>>>>     session with IS-IS router B in another area over their own IPv6
>>>>>     addresses. When router A needs to send L3VPN traffic to router B via
>>>>>     a MPLS-SR tunnel, router A wants to know whether router B has the
>>>>>     ELC (http://tools.ietf.org/html/draft-xu-isis-mpls-elc-00) before
>>>>>     <http://tools.ietf.org/html/draft-xu-isis-mpls-elc-00)%20before>
>>>>>     inserting an EL into the MPLS-SR packet . However, the Capability
>>>>>     TLV originated by router B doesn’t carried an IPv6 address of its
>>>>>     own. As a result, it’s hard for router A to know the ELC of router B.
>>>>>
>>>>>
>>>>>
>>>>>     Best regards,
>>>>>
>>>>>     Xiaohu
>>>>>
>>>>>
>>>>>
>>>>>     *发件人:*George, Wes [mailto:wesley.george@twcable.com]
>>>>>     *发送时间:*2014年5月2日1:51
>>>>>     *收件人:*Xuxiaohu
>>>>>     *抄送:*sunset4@ietf.org <mailto:sunset4@ietf.org>;
>>>>>     fanpeng@chinamobile.com <mailto:fanpeng@chinamobile.com>;
>>>>>     lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobile.com>
>>>>>     *主题:*Re: [sunset4] IPv6 router IDs
>>>>>
>>>>>
>>>>>
>>>>>     I got a bounce-back on all 3 draft aliases, trying again with the
>>>>>     authors’s email addresses directly.
>>>>>
>>>>>
>>>>>
>>>>>     *From: *<George>, "George, Wes" <wesley.george@twcable.com
>>>>>     <mailto:wesley.george@twcable.com>>
>>>>>     *Date: *Thursday, May 1, 2014 at 1:42 PM
>>>>>     *To: *"draft-xu-isis-ipv6-router-id@tools.ietf.org
>>>>>     <mailto:draft-xu-isis-ipv6-router-id@tools.ietf.org>"
>>>>>     <draft-xu-isis-ipv6-router-id@tools.ietf.org
>>>>>     <mailto:draft-xu-isis-ipv6-router-id@tools.ietf.org>>,
>>>>>     "draft-xu-ospf-ipv6-router-id@tools.ietf.org
>>>>>     <mailto:draft-xu-ospf-ipv6-router-id@tools.ietf.org>"
>>>>>     <draft-xu-ospf-ipv6-router-id@tools.ietf.org
>>>>>     <mailto:draft-xu-ospf-ipv6-router-id@tools.ietf.org>>
>>>>>     *Cc: *"draft-fan-idr-ipv6-bgp-id@tools.ietf.org
>>>>>     <mailto:draft-fan-idr-ipv6-bgp-id@tools.ietf.org>"
>>>>>     <draft-fan-idr-ipv6-bgp-id@tools.ietf.org
>>>>>     <mailto:draft-fan-idr-ipv6-bgp-id@tools.ietf.org>>,
>>>>>     "sunset4@ietf.org <mailto:sunset4@ietf.org>" <sunset4@ietf.org
>>>>>     <mailto:sunset4@ietf.org>>
>>>>>     *Subject: *[sunset4] IPv6 router IDs
>>>>>
>>>>>
>>>>>
>>>>>     I see that you have submitted two drafts for IPv6 router IDs in ISIS
>>>>>     and OSPF, noting that the existing router ID is only 4 octets. This
>>>>>     has also come up in IDR for BGP. The authors of that draft are
>>>>>     copied. I’ll give you a similar set of feedback to what I gave
>>>>> them -
>>>>>
>>>>>
>>>>>
>>>>>     It is important to distinguish between places where a unique
>>>>>     identifier is needed, and by *convention* an IPv4 address assigned
>>>>>     to the device has been used to provide that unique ID, vs. places
>>>>>     where the actual IP address has some sort of importance to the
>>>>>     protocol (I.e. That information must be available to take action on).
>>>>>
>>>>>     In other words, is the protocol requirement that the ID be unique
>>>>>     across some domain, but that the actual value does not matter, or is
>>>>>     the protocol requirement that the value must correspond to something
>>>>>     on the router? In many of the former cases, the fact that the value
>>>>>     isn’t relevant has been used to make recommendations that are easier
>>>>>     for humans to deal with (I.e. Tying the router ID to an IP address)
>>>>>     but that value as a human-readable set of info does not necessarily
>>>>>     justify  changes to the protocol to support that convention as we
>>>>>     move to IPv6.
>>>>>
>>>>>     I would argue that the router ID used in routing protocols must
>>>>>     merely be unique, but it doesn’t have to be an IP address at all.
>>>>>     Thus it is not strictly necessary to create a new field to carry
>>>>>     IPv6 addresses when operating without IPv4 addresses on a network.
>>>>>     If you believe otherwise, the justification needs to be documented
>>>>>     in the draft.
>>>>>
>>>>>
>>>>>
>>>>>     There are many places in IETF protocols where a 32 bit unique
>>>>>     identifier is needed, and by convention an IPv4 address has been
>>>>>     used. It would be far more useful to write a general draft
>>>>>     identifying this problem and discussing several solutions, including
>>>>>     simply generating unique IDs manually, systematically generating a
>>>>>     random ID, etc.  the place for such a draft may be in Sunset4,
>>>>>     either as a part of the existing gap analysis draft or as another
>>>>>     standalone draft.
>>>>>
>>>>>
>>>>>
>>>>>     There was rather a long discussion about this on IDR, thread
>>>>>     here:
>>>>> https://mailarchive.ietf.org/arch/search/?qdr=a&email_list=idr&q=%22
>>>>> %5
>>>>> Bidr%5D+%5Bv6ops%5D+BGP+Identifier%22&as=1&gbt=1
>>>>>
>>>>>
>>>>>
>>>>>     And in the IDR meeting, minutes:
>>>>>
>>>>>     http://www.ietf.org/proceedings/89/minutes/minutes-89-idr (see
>>>>> page 11)
>>>>>
>>>>>
>>>>>
>>>>>     I’d encourage the authors of these drafts to work together on this.
>>>>>
>>>>>
>>>>>
>>>>>     Thanks,
>>>>>
>>>>>
>>>>>
>>>>>     Wes George
>>>>>
>>>>>
>>>>>
>>>>>     Anything below this line has been added by my company’s mail server,
>>>>>     I have no control over it.
>>>>>
>>>>>     -----------
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --------------------------------------------------------------------
>>>>> --
>>>>> --
>>>>>
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>>>>>     you are hereby notified that any dissemination, distribution,
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>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> sunset4 mailing list
>>>>> sunset4@ietf.org
>>>>> https://www.ietf.org/mailman/listinfo/sunset4
>>>>>
>>>>
>>>
>>> _______________________________________________
>>> OSPF mailing list
>>> OSPF@ietf.org
>>> https://www.ietf.org/mailman/listinfo/ospf
>
> _______________________________________________
> OSPF mailing list
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e-break: after-white-space;">
Hi Uma,
<div><br>
<div>
<div>On May 9, 2014, at 8:03 PM, Uma Chunduri &lt;<a href=3D"mailto:uma.chu=
nduri@ericsson.com">uma.chunduri@ericsson.com</a>&gt; wrote:</div>
<br class=3D"Apple-interchange-newline">
<blockquote type=3D"cite">
<div>
<div style=3D"font-family: Helvetica; font-size: 14px; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; line-hei=
ght: normal; orphans: auto; text-align: start; text-indent: 0px; text-trans=
form: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-t=
ext-stroke-width: 0px;">
<font face=3D"Calibri" size=3D"2"><span style=3D"font-size: 11pt;">
<div>Hi Acee,</div>
<div><font color=3D"#00B050">In-line [Uma]:</font></div>
<div>&nbsp;</div>
<div>&gt;I can see these -</div>
<div>&gt;1.&nbsp; RLFA TLDP session without having to worry a PQ node suppo=
rts TE or</div>
<div>&gt;not</div>
<div>&nbsp;</div>
<div>I don't think this is a good use case. You need to have an the AF topo=
logy in order to compute the remote LFA. Also, you may inherit remote LFA t=
argets for external and prefixes from other areas but you will never comput=
e remote LFA targets in other areas
 (at least not with today's algorithms).</div>
<div>&nbsp;</div>
<div><font color=3D"#00B050">[Uma]: It doesn't have to be a different area.=
 Take a simplest case of one area or an L2 domain; after having computed al=
l the PQ nodes in that area/domain if the PQ node doesn't support TE and do=
esn't advertise router ID (TLV 134)
 which IP address you would pick for TLDP session ?&nbsp; You can't reliabl=
y know from the advertised prefixes from the node that it is hosted by&nbsp=
; the node if router ID is not emitted by the node (as it doesn't support T=
E).</font></div>
</span></font></div>
</div>
</blockquote>
<div><br>
</div>
<div>The only advantage I can see is that a router can explicitly specify w=
hich local address it wants to use for targeted LFA sessions.&nbsp;</div>
<br>
<blockquote type=3D"cite">
<div>
<div style=3D"font-family: Helvetica; font-size: 14px; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; line-hei=
ght: normal; orphans: auto; text-align: start; text-indent: 0px; text-trans=
form: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-t=
ext-stroke-width: 0px;">
<font face=3D"Calibri" size=3D"2"><span style=3D"font-size: 11pt;">
<div><font color=3D"#00B050">&nbsp;</font></div>
<div>&gt;2. Orchestration software on a controller or an application which =
is</div>
<div>&gt;having access to</div>
<div>&gt;&nbsp;&nbsp; the topology database of the network may determine th=
e node IP</div>
<div>&gt;address without having to go through the hoops (to determine if it=
's</div>
<div>&gt;redistributed or leaked etc..)</div>
<div>&gt;&nbsp;&nbsp; with this TLV.</div>
<div>&nbsp;</div>
<div>Can you be more precise? If the orchestration application is going to =
orchestrate across multiple areas, I would hope it would have visibility to=
 the topologies of these areas.</div>
<div>&nbsp;</div>
<div><font color=3D"#00B050">[Uma]: Even for a same area or domain having a=
 node advertise it's loopback as router ID without relation any relation to=
 TE (supported or not) is a benefit in this case.</font></div>
<div><font color=3D"#00B050">The ability of an application on a controller =
to know this easily is a huge advantage.</font></div>
<div><font color=3D"#00B050">Also there could be multiple loopback and each=
 for different purposes. For e.g. a PCE on a controller with<span class=3D"=
Apple-converted-space">&nbsp;</span><a href=3D"https://tools.ietf.org/html/=
draft-ietf-pce-pceps">https://tools.ietf.org/html/draft-ietf-pce-pceps</a><=
span class=3D"Apple-converted-space">&nbsp;</span>can
 know PCC address</font></div>
<div><font color=3D"#00B050">with a firewall port/IP opened on the router f=
or TLS connection. It would be great this can happen easily and automatical=
ly.</font></div>
</span></font></div>
</div>
</blockquote>
<div><br>
</div>
<div>I don=A1=A6t think anyone would have a firewall within an IGP routing =
domain. Hence, it would be the same purported advantage as above.&nbsp;</di=
v>
<div><br>
</div>
<div>Thanks,</div>
<div>Acee&nbsp;</div>
<div><br>
</div>
<div><br>
</div>
<br>
<blockquote type=3D"cite">
<div>
<div style=3D"font-family: Helvetica; font-size: 14px; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; line-hei=
ght: normal; orphans: auto; text-align: start; text-indent: 0px; text-trans=
form: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-t=
ext-stroke-width: 0px;">
<font face=3D"Calibri" size=3D"2"><span style=3D"font-size: 11pt;">
<div><font color=3D"#00B050">&nbsp;</font></div>
<div>--</div>
<div>Uma C.</div>
</span></font></div>
</div>
</blockquote>
</div>
<br>
</div>
</body>
</html>

--_000_96F7B28AFAE848BF9A88985E3AAC9436ericssoncom_--


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To: Uma Chunduri <uma.chunduri@ericsson.com>,  Acee Lindem <acee.lindem@ericsson.com>
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Cc: Joel jaeggli <joelja@bogus.com>, OSPF List <ospf@ietf.org>, "sunset4@ietf.org" <sunset4@ietf.org>, Wes George <wesley.george@twcable.com>, "lizhenqiang@chinamobile.com" <lizhenqiang@chinamobile.com>
Subject: Re: [sunset4] =?utf-8?b?W0lzaXMtd2ddIFtPU1BGXSDnrZTlpI06ICDnrZTlpI06?= =?utf-8?q?_____IPv6_router_IDs?=
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(Only to Acee and Uma.  I will let you two sort this out on the list.)

Reading this thread, it look's to me like whatever uses this has, they 
are not related to the router ID.
So if there is anything here at all, it is some other service address 
advertisement.

Uma, I would point out that currently one can not assume that a received 
router ID is a usqble address.  Hence, there has to be an upgrade to the 
advertising router to indicate this new usage.  If there is an upgrade, 
then most of the use cases are addressed either by upgrading to the 
feature you really want, or by some form of service address 
advertisement.  Router ID does not seem to be the right hook.

Yours,
Joel

On 5/11/14, 10:29 PM, Uma Chunduri wrote:
> Hi Acee,
>
> My comments inline [Uma1]
>
> --
>
> Uma C.
>
> *From:*Acee Lindem
> *Sent:* Friday, May 09, 2014 6:47 PM
> *To:* Uma Chunduri
> *Cc:* Xuxiaohu; isis-wg@ietf.org; Wes George; Anton Smirnov;
> fanpeng@chinamobile.com; Joel jaeggli; OSPF List; sunset4@ietf.org;
> lizhenqiang@chinamobile.com
> *Subject:* Re: [Isis-wg] [OSPF] 答复: 答复: [sunset4] IPv6 router IDs
>
> Hi Uma,
>
> On May 9, 2014, at 8:03 PM, Uma Chunduri <uma.chunduri@ericsson.com
> <mailto:uma.chunduri@ericsson.com>> wrote:
>
>
>
> Hi Acee,
>
> In-line [Uma]:
>
>>I can see these -
>
>>1.  RLFA TLDP session without having to worry a PQ node supports TE or
>
>>not
>
> I don't think this is a good use case. You need to have an the AF
> topology in order to compute the remote LFA. Also, you may inherit
> remote LFA targets for external and prefixes from other areas but you
> will never compute remote LFA targets in other areas (at least not with
> today's algorithms).
>
> [Uma]: It doesn't have to be a different area. Take a simplest case of
> one area or an L2 domain; after having computed all the PQ nodes in that
> area/domain if the PQ node doesn't support TE and doesn't advertise
> router ID (TLV 134) which IP address you would pick for TLDP session ?
> You can't reliably know from the advertised prefixes from the node that
> it is hosted by  the node if router ID is not emitted by the node (as it
> doesn't support TE).
>
> The only advantage I can see is that a router can explicitly specify
> which local address it wants to use for targeted LFA sessions.
>
>
> [Uma1]: Yes Acee. This is more practical way and a separate IP can be
> hosted for this and this has to be advertised as “router IP”
>
>>2. Orchestration software on a controller or an application which is
>
>>having access to
>
>>   the topology database of the network may determine the node IP
>
>>address without having to go through the hoops (to determine if it's
>
>>redistributed or leaked etc..)
>
>>   with this TLV.
>
> Can you be more precise? If the orchestration application is going to
> orchestrate across multiple areas, I would hope it would have visibility
> to the topologies of these areas.
>
> [Uma]: Even for a same area or domain having a node advertise it's
> loopback as router ID without relation any relation to TE (supported or
> not) is a benefit in this case.
>
> The ability of an application on a controller to know this easily is a
> huge advantage.
>
> Also there could be multiple loopback and each for different purposes.
> For e.g. a PCE on a controller
> withhttps://tools.ietf.org/html/draft-ietf-pce-pcepscan know PCC address
>
> with a firewall port/IP opened on the router for TLS connection. It
> would be great this can happen easily and automatically.
>
> I don’t think anyone would have a firewall within an IGP routing domain.
> Hence, it would be the same purported advantage as above.
>
> [Uma]: IMO, it depends on the controller (where it’s located) and how
> many areas/ASes it is overseeing and also depends on applications it’s
> giving to access to network nodes.
>
>               In a pure IGP environment, application of FW may not be
> necessary, but  giving access to the nodes through
> applications/controller is completely a different thing and security
> requirements can be different.
>
>              Also the main point as you can see here is not only about
> security but it’s about giving visibility of the “router IP” through
> topology database to an outside entity.
>
> Overall , FWIW it’s an useful addition to indicate this through (a
> sub-tlv of) the router capability TLV as presented here.
>
> --
>
> Uma  C.
>
>
>
> _______________________________________________
> Isis-wg mailing list
> Isis-wg@ietf.org
> https://www.ietf.org/mailman/listinfo/isis-wg
>


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From: Uma Chunduri <uma.chunduri@ericsson.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>, Acee Lindem <acee.lindem@ericsson.com>
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Subject: Re: [sunset4] =?utf-8?b?W0lzaXMtd2ddIFtPU1BGXSDnrZTlpI06ICDnrZTlpI06?= =?utf-8?q?_____IPv6_router_IDs?=
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On 5/11/14, 8:01 PM, Uma Chunduri wrote:
> Dear Joel,
> =20
>>Uma, I would point out that currently one cannot assume that a received=
 router ID is a usqble address. =20
> =20
> I agree this is true for OSPF.
> =20
> But for IS-IS it's always a routable IP, but the point is it may not be=

> there if there is no TE.

an sub tlv 6 interface-id is a not router-id

an isis system id is neither 32 bits  nor ip.

> RFC 6119
>         " 4.1.  IPv6 TE Router ID TLV
> =20
>          The IPv6 TE Router ID TLV is TLV type 140.
> =20
>          The IPv6 TE Router ID TLV contains a 16-octet IPv6 address.  A=

> stable
>          global IPv6 address MUST be used, so that the router ID provid=
es a
>          routable address, regardless of the state of a node's interfac=
es.
> =20
>          If a router does not implement traffic engineering, it MAY
> include or
>          omit the IPv6 TE Router ID TLV."

 IPv6 TE Router ID TLV

is not semantically equivalent to router-id or system  id and should not
be treated as  such.

> Same story for IPv4 per RFC 5305. It's better to leave this "Router ID"=

> alone for this purpose (or relax this to non TE purposes too, but one
> can't advertise multiple of them).
> =20
>>Hence, there has to be an upgrade to the advertising router to indicate=
 this new usage.  If there is an upgrade, then most of the use cases are =
addressed either by upgrading to the feature you really want, or by some =
form of service address >advertisement.  Router ID does not
> seem to be the right hook.
> =20
> Instead of "Router ID", I agree it's better to call it as Service IP or=

> "routable IP address" TLV.
> Yes, upgrade would be require for any node to emit this one!
> =20
> --
> Uma C.
> =20
> =20
> -----Original Message-----
> From: Joel M. Halpern [mailto:jmh@joelhalpern.com]
> Sent: Sunday, May 11, 2014 7:42 PM
> To: Uma Chunduri; Acee Lindem
> Cc: Wes George; Joel jaeggli; OSPF List; sunset4@ietf.org;
> lizhenqiang@chinamobile.com
> Subject: Re: [Isis-wg] [OSPF] =E7=AD=94=E5=A4=8D: =E7=AD=94=E5=A4=8D: [=
sunset4] IPv6 router IDs
> =20
> (Only to Acee and Uma.  I will let you two sort this out on the list.)
> =20
> Reading this thread, it look's to me like whatever uses this has, they
> are not related to the router ID.
> So if there is anything here at all, it is some other service address
> advertisement.
> =20
> Uma, I would point out that currently one can not assume that a receive=
d
> router ID is a usqble address.  Hence, there has to be an upgrade to th=
e
> advertising router to indicate this new usage.  If there is an upgrade,=

> then most of the use cases are addressed either by upgrading to the
> feature you really want, or by some form of service address
> advertisement.  Router ID does not seem to be the right hook.
> =20
> Yours,
> Joel
> =20
> On 5/11/14, 10:29 PM, Uma Chunduri wrote:
>> Hi Acee,
>>
>> My comments inline [Uma1]
>>
>> --
>>
>> Uma C.
>>
>> *From:*Acee Lindem
>> *Sent:* Friday, May 09, 2014 6:47 PM
>> *To:* Uma Chunduri
>> *Cc:* Xuxiaohu; isis-wg@ietf.org <mailto:isis-wg@ietf.org>; Wes George=
; Anton Smirnov;
>> fanpeng@chinamobile.com <mailto:fanpeng@chinamobile.com>; Joel jaeggli=
;
> OSPF List; sunset4@ietf.org <mailto:sunset4@ietf.org>;
>> lizhenqiang@chinamobile.com <mailto:lizhenqiang@chinamobile.com>
>> *Subject:* Re: [Isis-wg] [OSPF] =E7=AD=94=E5=A4=8D: =E7=AD=94=E5=A4=8D=
: [sunset4] IPv6 router IDs
>>
>> Hi Uma,
>>
>> On May 9, 2014, at 8:03 PM, Uma Chunduri <uma.chunduri@ericsson.com=20
>> <mailto:uma.chunduri@ericsson.com>> wrote:
>>
>>
>>
>> Hi Acee,
>>
>> In-line [Uma]:
>>
>>>I can see these -
>>
>>>1.  RLFA TLDP session without having to worry a PQ node supports TE or=

>>
>>>not
>>
>> I don't think this is a good use case. You need to have an the AF=20
>> topology in order to compute the remote LFA. Also, you may inherit=20
>> remote LFA targets for external and prefixes from other areas but you =

>> will never compute remote LFA targets in other areas (at least not=20
>> with today's algorithms).
>>
>> [Uma]: It doesn't have to be a different area. Take a simplest case of=
=20
>> one area or an L2 domain; after having computed all the PQ nodes in=20
>> that area/domain if the PQ node doesn't support TE and doesn't=20
>> advertise router ID (TLV 134) which IP address you would pick for TLDP=
 session ?
>> You can't reliably know from the advertised prefixes from the node=20
>> that it is hosted by  the node if router ID is not emitted by the node=
=20
>> (as it doesn't support TE).
>>
>> The only advantage I can see is that a router can explicitly specify=20
>> which local address it wants to use for targeted LFA sessions.
>>
>>
>> [Uma1]: Yes Acee. This is more practical way and a separate IP can be =

>> hosted for this and this has to be advertised as =E2=80=9Crouter IP=E2=
=80=9D
>>
>>>2. Orchestration software on a controller or an application which is
>>
>>>having access to
>>
>>>   the topology database of the network may determine the node IP
>>
>>>address without having to go through the hoops (to determine if it's
>>
>>>redistributed or leaked etc..)
>>
>>>   with this TLV.
>>
>> Can you be more precise? If the orchestration application is going to =

>> orchestrate across multiple areas, I would hope it would have=20
>> visibility to the topologies of these areas.
>>
>> [Uma]: Even for a same area or domain having a node advertise it's=20
>> loopback as router ID without relation any relation to TE (supported=20
>> or
>> not) is a benefit in this case.
>>
>> The ability of an application on a controller to know this easily is a=
=20
>> huge advantage.
>>
>> Also there could be multiple loopback and each for different purposes.=

>> For e.g. a PCE on a controller
>> withhttps://tools.ietf.org/html/draft-ietf-pce-pcepscan know PCC=20
>> address
>>
>> with a firewall port/IP opened on the router for TLS connection. It=20
>> would be great this can happen easily and automatically.
>>
>> I don=E2=80=99t think anyone would have a firewall within an IGP routi=
ng domain.
>> Hence, it would be the same purported advantage as above.
>>
>> [Uma]: IMO, it depends on the controller (where it=E2=80=99s located) =
and how=20
>> many areas/ASes it is overseeing and also depends on applications it=E2=
=80=99s=20
>> giving to access to network nodes.
>>
>>               In a pure IGP environment, application of FW may not be =

>> necessary, but  giving access to the nodes through=20
>> applications/controller is completely a different thing and security=20
>> requirements can be different.
>>
>>              Also the main point as you can see here is not only about=
=20
>> security but it=E2=80=99s about giving visibility of the =E2=80=9Crout=
er IP=E2=80=9D through=20
>> topology database to an outside entity.
>>
>> Overall , FWIW it=E2=80=99s an useful addition to indicate this throug=
h (a=20
>> sub-tlv of) the router capability TLV as presented here.
>>
>> --
>>
>> Uma  C.
>>
>>
>>
>> _______________________________________________
>> Isis-wg mailing list
>> Isis-wg@ietf.org <mailto:Isis-wg@ietf.org>
>> https://www.ietf.org/mailman/listinfo/isis-wg
>>
> =20
>=20
>=20
> _______________________________________________
> sunset4 mailing list
> sunset4@ietf.org
> https://www.ietf.org/mailman/listinfo/sunset4
>=20



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<body lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi Acee,<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">My comments inline [Uma1]=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:EN-US=
">--<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:EN-US=
">Uma C.<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Acee Lin=
dem
<br>
<b>Sent:</b> Friday, May 09, 2014 6:47 PM<br>
<b>To:</b> Uma Chunduri<br>
<b>Cc:</b> Xuxiaohu; isis-wg@ietf.org; Wes George; Anton Smirnov; fanpeng@c=
hinamobile.com; Joel jaeggli; OSPF List; sunset4@ietf.org; lizhenqiang@chin=
amobile.com<br>
<b>Subject:</b> Re: [Isis-wg] [OSPF] </span><span lang=3D"ZH-TW" style=3D"f=
ont-size:10.0pt">=B4=F0=B8=B4</span><span style=3D"font-size:10.0pt;font-fa=
mily:&quot;Tahoma&quot;,&quot;sans-serif&quot;">:
</span><span lang=3D"ZH-TW" style=3D"font-size:10.0pt">=B4=F0=B8=B4</span><=
span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-se=
rif&quot;">: [sunset4] IPv6 router IDs<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hi Uma,<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal">On May 9, 2014, at 8:03 PM, Uma Chunduri &lt;<a href=
=3D"mailto:uma.chunduri@ericsson.com">uma.chunduri@ericsson.com</a>&gt; wro=
te:<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><br>
<br>
<o:p></o:p></p>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">Hi Acee,<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#00B050">In-line [Uma]:</span><spa=
n style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-seri=
f&quot;"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&gt;I can see these -<o:p></o:p></span>=
</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&gt;1.&nbsp; RLFA TLDP session without =
having to worry a PQ node supports TE or<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&gt;not<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">I don't think this is a good use case. =
You need to have an the AF topology in order to compute the remote LFA. Als=
o, you may inherit remote LFA targets for external and prefixes
 from other areas but you will never compute remote LFA targets in other ar=
eas (at least not with today's algorithms).<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#00B050">[Uma]: It doesn't have to=
 be a different area. Take a simplest case of one area or an L2 domain; aft=
er having computed all the PQ nodes in that area/domain
 if the PQ node doesn't support TE and doesn't advertise router ID (TLV 134=
) which IP address you would pick for TLDP session ?&nbsp; You can't reliab=
ly know from the advertised prefixes from the node that it is hosted by&nbs=
p; the node if router ID is not emitted by
 the node (as it doesn't support TE).</span><span style=3D"font-size:11.0pt=
;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;"><o:p></o:p></span>=
</p>
</div>
</div>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">The only advantage I can see is that a router can ex=
plicitly specify which local address it wants to use for targeted LFA sessi=
ons.&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><br>
<span style=3D"color:#1F497D">[Uma1]: Yes Acee. This is more practical way =
and a separate IP can be hosted for this and this has to be advertised as =
=A1=B0router IP=A1=B1</span><o:p></o:p></p>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#00B050">&nbsp;</span><span style=
=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;=
"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&gt;2. Orchestration software on a cont=
roller or an application which is<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&gt;having access to<o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&gt;&nbsp;&nbsp; the topology database =
of the network may determine the node IP<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&gt;address without having to go throug=
h the hoops (to determine if it's<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&gt;redistributed or leaked etc..)<o:p>=
</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&gt;&nbsp;&nbsp; with this TLV.<o:p></o=
:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">Can you be more precise? If the orchest=
ration application is going to orchestrate across multiple areas, I would h=
ope it would have visibility to the topologies of these
 areas.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#00B050">[Uma]: Even for a same ar=
ea or domain having a node advertise it's loopback as router ID without rel=
ation any relation to TE (supported or not) is a benefit
 in this case.</span><span style=3D"font-size:11.0pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#00B050">The ability of an applica=
tion on a controller to know this easily is a huge advantage.</span><span s=
tyle=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&q=
uot;"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#00B050">Also there could be multi=
ple loopback and each for different purposes. For e.g. a PCE on a controlle=
r with<span class=3D"apple-converted-space">&nbsp;</span><a href=3D"https:/=
/tools.ietf.org/html/draft-ietf-pce-pceps">https://tools.ietf.org/html/draf=
t-ietf-pce-pceps</a><span class=3D"apple-converted-space">&nbsp;</span>can
 know PCC address</span><span style=3D"font-size:11.0pt;font-family:&quot;C=
alibri&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#00B050">with a firewall port/IP o=
pened on the router for TLS connection. It would be great this can happen e=
asily and automatically.</span><span style=3D"font-size:11.0pt;font-family:=
&quot;Calibri&quot;,&quot;sans-serif&quot;"><o:p></o:p></span></p>
</div>
</div>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">I don=A1=AFt think anyone would have a firewall with=
in an IGP routing domain. Hence, it would be the same purported advantage a=
s above.&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">[Uma]: IMO, it depends on=
 the controller (where it=A1=AFs located) and how many areas/ASes it is ove=
rseeing and also depends on applications it=A1=AFs giving to access
 to network nodes.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; In a pure IGP environment, =
application of FW may not be necessary, but &nbsp;giving access to the node=
s through applications/controller is completely
 a different thing and security requirements can be different.<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Also the main point as you can se=
e here is not only about security but it=A1=AFs about giving visibility of =
the =A1=B0router IP=A1=B1 through topology database
 to an outside entity.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Overall , FWIW it=A1=AFs =
an useful addition to indicate this through (a sub-tlv of) the router capab=
ility TLV as presented here.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">--<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">Uma&nbsp; C.<o:p></o:p></=
span></p>
</div>
</div>
</div>
</div>
</body>
</html>

--_000_1B502206DFA0C544B7A60469152008633F27B80Deusaamb105erics_--


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