
From nobody Mon Oct  6 06:26:45 2014
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From: "Jim Guichard (jguichar)" <jguichar@cisco.com>
To: "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: SFC Honolulu meeting agenda
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Date: Mon, 6 Oct 2014 13:26:40 +0000
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Subject: [sfc] SFC Honolulu meeting agenda
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--_000_D05810C839E9Ejguicharciscocom_
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Greetings WG:

Our meeting at the upcoming Honolulu venue is fast approaching.  As always,=
 the goal of the meeting will be to make the best use of limited face-to-fa=
ce time.

As we build the meeting agenda we welcome requests for agenda time. As alwa=
ys, the goal of a meeting slot is to best further the work of the WG, and t=
hat generally means focussing on key charter deliverables and topics with i=
mportant open issues to resolve. In the case of individual IDs, the goal is=
n=92t necessarily to present what is in the draft but rather to help the WG=
 decide what to do with the ID. With that in mind, when making an agenda re=
quest please consider what you think the WG should do with its content. For=
 example:

  *   Does the document have useful content that should be moved into anoth=
er WG document or progress on it=92s own merit
  *   Does the content have a good basis for one of the WG documents per th=
e charter (in order for that to happen the document needs to be the most ap=
propriate out of the collection of related documents)
  *   Should the document content be merged with one or more other document=
s, so that a combined document could become a WG document

Jim & Thomas

--_000_D05810C839E9Ejguicharciscocom_
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252">
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami=
ly: Calibri, sans-serif;">
<div>
<div>Greetings WG:</div>
<div><br>
</div>
<div>Our meeting at the upcoming Honolulu venue is fast approaching. &nbsp;=
<span style=3D"font-size: medium;">As&nbsp;</span><span style=3D"font-size:=
 medium;">always, the goal of the meeting will be to make the best use of&n=
bsp;</span><span style=3D"font-size: medium;">limited
 face-to-face time.</span></div>
<div style=3D"font-family: Calibri;">
<div style=3D"font-size: medium;"><br>
</div>
<div style=3D"font-size: medium;">As we build the meeting agenda we welcome=
 requests for agenda time. As always, the goal of a meeting slot is to best=
 further the work of the WG, and that generally means focussing on key char=
ter deliverables and topics with important
 open issues to resolve. In the case of individual IDs, the goal isn=92t ne=
cessarily to present what is in the draft but rather to help the WG decide =
what to do with the ID. With that in mind, when making an agenda request pl=
ease consider what you think the WG
 should do with its content. For example:</div>
<ul>
<li>Does the document have useful content that should be moved into another=
 WG document or progress on it=92s own merit</li><li>Does the content have =
a good basis for one of the WG documents per the charter (in order for that=
 to happen the document needs to be the most appropriate out of the collect=
ion of related documents)</li><li>Should the document content be merged wit=
h one or more other documents, so that a combined document could become a W=
G document</li></ul>
<div style=3D"font-size: medium;">Jim &amp; Thomas</div>
</div>
</div>
</body>
</html>

--_000_D05810C839E9Ejguicharciscocom_--


From nobody Tue Oct  7 11:20:56 2014
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Date: Tue, 07 Oct 2014 14:20:38 -0400
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From: Thomas Narten <narten@us.ibm.com>
To: sfc@ietf.org
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Subject: [sfc] SFC Architecture draft
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WG:

The editors of the architecture document indicate that they have
addressed all known comments and that there are no open issues with
the current version of the document. They believe it is ready to start
a WG LC.

Does the WG agree? Does anyone have any remaining issues they would
like to bring up? Or have issues that they feel have not been
adequately addressed yet?

If anyone has been meaning to (re)review the document, now would be a
good time (and feel free to send a note to the chairs that you'd like
a little time to do so).

In the absence of specific feedback indicating the document is not
ready, we expect to start WGLC prior in the next week or so.

Thomas


From nobody Tue Oct  7 18:51:35 2014
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From: Xuxiaohu <xuxiaohu@huawei.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: SFC Honolulu meeting agenda
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Date: Wed, 8 Oct 2014 08:50:28 +0000
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Subject: Re: [sfc] SFC Honolulu meeting agenda
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Hi co-chairs,

I would like to request a 15-min slot for presenting the following draft (h=
ttps://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-00). Since "Gener=
ic SFC Encapsulation" is one of the WG charter deliverables and the charter=
 states that "...The working group will consider using an existing encapsul=
ation (with extensions as appropriate) if a suitable candidate is found..."=
 I would like the WG to help evaluating whether the MPLS-SPRING-based SFC e=
ncapsulation approach as described in the above draft could be considered a=
s one of the candidates.

Best regards,
Xiaohu

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Jim Guichard (jguichar=
)
Sent: Monday, October 06, 2014 9:27 PM
To: sfc@ietf.org
Subject: [sfc] SFC Honolulu meeting agenda

Greetings WG:

Our meeting at the upcoming Honolulu venue is fast approaching.  As always,=
 the goal of the meeting will be to make the best use of limited face-to-fa=
ce time.

As we build the meeting agenda we welcome requests for agenda time. As alwa=
ys, the goal of a meeting slot is to best further the work of the WG, and t=
hat generally means focussing on key charter deliverables and topics with i=
mportant open issues to resolve. In the case of individual IDs, the goal is=
n't necessarily to present what is in the draft but rather to help the WG d=
ecide what to do with the ID. With that in mind, when making an agenda requ=
est please consider what you think the WG should do with its content. For e=
xample:

  *   Does the document have useful content that should be moved into anoth=
er WG document or progress on it's own merit
  *   Does the content have a good basis for one of the WG documents per th=
e charter (in order for that to happen the document needs to be the most ap=
propriate out of the collection of related documents)
  *   Should the document content be merged with one or more other document=
s, so that a combined document could become a WG document
Jim & Thomas

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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi co-chai=
rs,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">I would li=
ke to request a 15-min slot for presenting the following draft (<a href=3D"=
https://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-00"><span style=
=3D"color:#1F497D;text-decoration:none">https://tools.ietf.org/html/draft-x=
u-sfc-using-mpls-spring-00</span></a>).
 Since &#8220;Generic SFC Encapsulation&#8221; is one of the WG charter del=
iverables and the charter states that &#8220;&#8230;The working group will =
consider using an existing encapsulation (with extensions as appropriate) i=
f a suitable candidate is found...&#8221; I would like the WG
 to help evaluating whether the MPLS-SPRING-based SFC encapsulation approac=
h as described in the above draft could be considered as one of the candida=
tes.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Best regar=
ds,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Xiaohu<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span =
lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&qu=
ot;sans-serif&quot;"> sfc [mailto:sfc-bounces@ietf.org]
<b>On Behalf Of </b>Jim Guichard (jguichar)<br>
<b>Sent:</b> Monday, October 06, 2014 9:27 PM<br>
<b>To:</b> sfc@ietf.org<br>
<b>Subject:</b> [sfc] SFC Honolulu meeting agenda<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Greetings WG=
:<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;<=
/o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Our meeting =
at the upcoming Honolulu venue is fast approaching. &nbsp;</span><span lang=
=3D"EN-US" style=3D"font-size:13.5pt;font-family:&quot;Calibri&quot;,&quot;=
sans-serif&quot;;color:black">As&nbsp;always,
 the goal of the meeting will be to make the best use of&nbsp;limited face-=
to-face time.</span><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-fam=
ily:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black"><o:p></o:p></sp=
an></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;<=
/o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">As we build =
the meeting agenda we welcome requests for agenda time. As always, the goal=
 of a meeting slot is to best further the work of the WG,
 and that generally means focussing on key charter deliverables and topics =
with important open issues to resolve. In the case of individual IDs, the g=
oal isn&#8217;t necessarily to present what is in the draft but rather to h=
elp the WG decide what to do with the
 ID. With that in mind, when making an agenda request please consider what =
you think the WG should do with its content. For example:<o:p></o:p></span>=
</p>
</div>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Does the document have useful content that shou=
ld be moved into another WG document or progress on it&#8217;s own merit<o:=
p></o:p></span></li><li class=3D"MsoNormal" style=3D"color:black;mso-margin=
-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Does the content have a good basis for one of t=
he WG documents per the charter (in order for that to happen the document n=
eeds to be the most appropriate out of the collection of
 related documents)<o:p></o:p></span></li><li class=3D"MsoNormal" style=3D"=
color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 =
level1 lfo1">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Should the document content be merged with one =
or more other documents, so that a combined document could become a WG docu=
ment<o:p></o:p></span></li></ul>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Jim &amp; Th=
omas<o:p></o:p></span></p>
</div>
</div>
</div>
</div>
</div>
</body>
</html>

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From nobody Thu Oct  9 10:35:54 2014
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From: "Surendra Kumar (smkumar)" <smkumar@cisco.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] SFC Honolulu meeting agenda
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Dear Chairs,

We would like a 15min slot to present the SFC path optimization (or offload=
s) draft (http://datatracker.ietf.org/doc/draft-kumar-sfc-sfp-optimization/=
).
We will publish an updated draft to reflect the feedback including correcti=
ons, we received.

Surendra.

From: "Jim Guichard (jguichar)" <jguichar@cisco.com<mailto:jguichar@cisco.c=
om>>
Date: Monday, October 6, 2014 6:26 AM
To: "sfc@ietf.org<mailto:sfc@ietf.org>" <sfc@ietf.org<mailto:sfc@ietf.org>>
Subject: [sfc] SFC Honolulu meeting agenda

Greetings WG:

Our meeting at the upcoming Honolulu venue is fast approaching.  As always,=
 the goal of the meeting will be to make the best use of limited face-to-fa=
ce time.

As we build the meeting agenda we welcome requests for agenda time. As alwa=
ys, the goal of a meeting slot is to best further the work of the WG, and t=
hat generally means focussing on key charter deliverables and topics with i=
mportant open issues to resolve. In the case of individual IDs, the goal is=
n=92t necessarily to present what is in the draft but rather to help the WG=
 decide what to do with the ID. With that in mind, when making an agenda re=
quest please consider what you think the WG should do with its content. For=
 example:

  *   Does the document have useful content that should be moved into anoth=
er WG document or progress on it=92s own merit
  *   Does the content have a good basis for one of the WG documents per th=
e charter (in order for that to happen the document needs to be the most ap=
propriate out of the collection of related documents)
  *   Should the document content be merged with one or more other document=
s, so that a combined document could become a WG document

Jim & Thomas

--_000_D05C143E57A74smkumarciscocom_
Content-Type: text/html; charset="Windows-1252"
Content-ID: <CDA1CDF8B5A0CE42A1C0AFD29C0FC5AD@emea.cisco.com>
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252">
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami=
ly: Calibri, sans-serif; ">
<div>Dear Chairs,</div>
<div><br>
</div>
<div>We would like a 15min slot to present the SFC path optimization (or of=
floads) draft (<a href=3D"http://datatracker.ietf.org/doc/draft-kumar-sfc-s=
fp-optimization">http://datatracker.ietf.org/doc/draft-kumar-sfc-sfp-optimi=
zation</a>/).</div>
<div>We will publish an updated draft to reflect the feedback including cor=
rections, we received.</div>
<div><br>
</div>
<div>Surendra.</div>
<div><br>
</div>
<span id=3D"OLK_SRC_BODY_SECTION">
<div style=3D"font-family:Calibri; font-size:11pt; text-align:left; color:b=
lack; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM:=
 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid;=
 BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<span style=3D"font-weight:bold">From: </span>&quot;Jim Guichard (jguichar)=
&quot; &lt;<a href=3D"mailto:jguichar@cisco.com">jguichar@cisco.com</a>&gt;=
<br>
<span style=3D"font-weight:bold">Date: </span>Monday, October 6, 2014 6:26 =
AM<br>
<span style=3D"font-weight:bold">To: </span>&quot;<a href=3D"mailto:sfc@iet=
f.org">sfc@ietf.org</a>&quot; &lt;<a href=3D"mailto:sfc@ietf.org">sfc@ietf.=
org</a>&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>[sfc] SFC Honolulu meeting=
 agenda<br>
</div>
<div><br>
</div>
<div>
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-famil=
y: Calibri, sans-serif;">
<div>
<div>Greetings WG:</div>
<div><br>
</div>
<div>Our meeting at the upcoming Honolulu venue is fast approaching. &nbsp;=
<span style=3D"font-size: medium;">As&nbsp;</span><span style=3D"font-size:=
 medium;">always, the goal of the meeting will be to make the best use of&n=
bsp;</span><span style=3D"font-size: medium;">limited
 face-to-face time.</span></div>
<div style=3D"font-family: Calibri;">
<div style=3D"font-size: medium;"><br>
</div>
<div style=3D"font-size: medium;">As we build the meeting agenda we welcome=
 requests for agenda time. As always, the goal of a meeting slot is to best=
 further the work of the WG, and that generally means focussing on key char=
ter deliverables and topics with important
 open issues to resolve. In the case of individual IDs, the goal isn=92t ne=
cessarily to present what is in the draft but rather to help the WG decide =
what to do with the ID. With that in mind, when making an agenda request pl=
ease consider what you think the WG
 should do with its content. For example:</div>
<ul>
<li>Does the document have useful content that should be moved into another=
 WG document or progress on it=92s own merit</li><li>Does the content have =
a good basis for one of the WG documents per the charter (in order for that=
 to happen the document needs to be the most appropriate out of the collect=
ion of related documents)</li><li>Should the document content be merged wit=
h one or more other documents, so that a combined document could become a W=
G document</li></ul>
<div style=3D"font-size: medium;">Jim &amp; Thomas</div>
</div>
</div>
</div>
</div>
</span>
</body>
</html>

--_000_D05C143E57A74smkumarciscocom_--


From nobody Thu Oct  9 10:52:40 2014
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From: "Reinaldo Penno (repenno)" <repenno@cisco.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] SFC Honolulu meeting agenda
Thread-Index: AQHP4+dpyxAGpEtBdkGiX0r4tImDNJwn6k6A
Date: Thu, 9 Oct 2014 17:52:30 +0000
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Subject: Re: [sfc] SFC Honolulu meeting agenda
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--_000_D05C193C3E7Crepennociscocom_
Content-Type: text/plain; charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable

Hello Chairs,

I would like 10 minutes to present:

http://tools.ietf.org/html/draft-penno-sfc-yang-07

Thanks,

Reinaldo

From: "Jim Guichard (jguichar)" <jguichar@cisco.com<mailto:jguichar@cisco.c=
om>>
Date: Monday, October 6, 2014 6:26 AM
To: "sfc@ietf.org<mailto:sfc@ietf.org>" <sfc@ietf.org<mailto:sfc@ietf.org>>
Subject: [sfc] SFC Honolulu meeting agenda

Greetings WG:

Our meeting at the upcoming Honolulu venue is fast approaching.  As always,=
 the goal of the meeting will be to make the best use of limited face-to-fa=
ce time.

As we build the meeting agenda we welcome requests for agenda time. As alwa=
ys, the goal of a meeting slot is to best further the work of the WG, and t=
hat generally means focussing on key charter deliverables and topics with i=
mportant open issues to resolve. In the case of individual IDs, the goal is=
n=92t necessarily to present what is in the draft but rather to help the WG=
 decide what to do with the ID. With that in mind, when making an agenda re=
quest please consider what you think the WG should do with its content. For=
 example:

  *   Does the document have useful content that should be moved into anoth=
er WG document or progress on it=92s own merit
  *   Does the content have a good basis for one of the WG documents per th=
e charter (in order for that to happen the document needs to be the most ap=
propriate out of the collection of related documents)
  *   Should the document content be merged with one or more other document=
s, so that a combined document could become a WG document

Jim & Thomas

--_000_D05C193C3E7Crepennociscocom_
Content-Type: text/html; charset="Windows-1252"
Content-ID: <FF8D404DE33F384EAC55ED100EE9F684@emea.cisco.com>
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252">
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami=
ly: Calibri, sans-serif;">
<div>Hello Chairs,</div>
<div><br>
</div>
<div>I would like 10 minutes to present:</div>
<div><br>
</div>
<div><a href=3D"http://tools.ietf.org/html/draft-penno-sfc-yang-07">http://=
tools.ietf.org/html/draft-penno-sfc-yang-07</a></div>
<div><br>
</div>
<div>Thanks,</div>
<div><br>
</div>
<div>Reinaldo</div>
<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; color: rgb(0, 0, 0); font-size: 14px; font-famil=
y: Calibri, sans-serif; ">
<div><br>
</div>
<span id=3D"OLK_SRC_BODY_SECTION">
<div style=3D"font-family:Calibri; font-size:11pt; text-align:left; color:b=
lack; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM:=
 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid;=
 BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<span style=3D"font-weight:bold">From: </span>&quot;Jim Guichard (jguichar)=
&quot; &lt;<a href=3D"mailto:jguichar@cisco.com">jguichar@cisco.com</a>&gt;=
<br>
<span style=3D"font-weight:bold">Date: </span>Monday, October 6, 2014 6:26 =
AM<br>
<span style=3D"font-weight:bold">To: </span>&quot;<a href=3D"mailto:sfc@iet=
f.org">sfc@ietf.org</a>&quot; &lt;<a href=3D"mailto:sfc@ietf.org">sfc@ietf.=
org</a>&gt;<br>
<span style=3D"font-weight:bold">Subject: </span>[sfc] SFC Honolulu meeting=
 agenda<br>
</div>
<div><br>
</div>
<div>
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line=
-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-famil=
y: Calibri, sans-serif;">
<div>
<div>Greetings WG:</div>
<div><br>
</div>
<div>Our meeting at the upcoming Honolulu venue is fast approaching. &nbsp;=
<span style=3D"font-size: medium;">As&nbsp;</span><span style=3D"font-size:=
 medium;">always, the goal of the meeting will be to make the best use of&n=
bsp;</span><span style=3D"font-size: medium;">limited
 face-to-face time.</span></div>
<div style=3D"font-family: Calibri;">
<div style=3D"font-size: medium;"><br>
</div>
<div style=3D"font-size: medium;">As we build the meeting agenda we welcome=
 requests for agenda time. As always, the goal of a meeting slot is to best=
 further the work of the WG, and that generally means focussing on key char=
ter deliverables and topics with important
 open issues to resolve. In the case of individual IDs, the goal isn=92t ne=
cessarily to present what is in the draft but rather to help the WG decide =
what to do with the ID. With that in mind, when making an agenda request pl=
ease consider what you think the WG
 should do with its content. For example:</div>
<ul>
<li>Does the document have useful content that should be moved into another=
 WG document or progress on it=92s own merit</li><li>Does the content have =
a good basis for one of the WG documents per the charter (in order for that=
 to happen the document needs to be the most appropriate out of the collect=
ion of related documents)</li><li>Should the document content be merged wit=
h one or more other documents, so that a combined document could become a W=
G document</li></ul>
<div style=3D"font-size: medium;">Jim &amp; Thomas</div>
</div>
</div>
</div>
</div>
</span></div>
</div>
</span>
</body>
</html>

--_000_D05C193C3E7Crepennociscocom_--


From nobody Fri Oct 10 01:58:33 2014
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From: Youjianjie <youjianjie@huawei.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: SFC Honolulu meeting agenda
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From nobody Fri Oct 10 02:27:00 2014
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From: Xuxiaohu <xuxiaohu@huawei.com>
To: Thomas Narten <narten@us.ibm.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] SFC Architecture draft
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Hi all,

> -----Original Message-----
> From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Thomas Narten
> Sent: Wednesday, October 08, 2014 2:21 AM
> To: sfc@ietf.org
> Subject: [sfc] SFC Architecture draft
>=20
> WG:
>=20
> The editors of the architecture document indicate that they have addresse=
d all
> known comments and that there are no open issues with the current version=
 of
> the document. They believe it is ready to start a WG LC.

It seems that this discussion thread (http://www.ietf.org/mail-archive/web/=
sfc/current/msg02705.html) is worthy for further discussions.

Best regards,
Xiaohu

> Does the WG agree? Does anyone have any remaining issues they would like =
to
> bring up? Or have issues that they feel have not been adequately addresse=
d yet?
>=20
> If anyone has been meaning to (re)review the document, now would be a goo=
d
> time (and feel free to send a note to the chairs that you'd like a little=
 time to do
> so).
>=20
> In the absence of specific feedback indicating the document is not ready,=
 we
> expect to start WGLC prior in the next week or so.
>=20
> Thomas
>=20
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc


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From: "Young, Jason" <Jason.W.Young@team.telstra.com>
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From nobody Fri Oct 10 07:55:35 2014
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I will defer to the chairs (of course), but my read of the discussion 
was that although there were concerns, there was not consensus for a 
change in what is in the document.

Yours,
Joel

On 10/10/14, 5:26 AM, Xuxiaohu wrote:
> Hi all,
>
>> -----Original Message-----
>> From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Thomas Narten
>> Sent: Wednesday, October 08, 2014 2:21 AM
>> To: sfc@ietf.org
>> Subject: [sfc] SFC Architecture draft
>>
>> WG:
>>
>> The editors of the architecture document indicate that they have addressed all
>> known comments and that there are no open issues with the current version of
>> the document. They believe it is ready to start a WG LC.
>
> It seems that this discussion thread (http://www.ietf.org/mail-archive/web/sfc/current/msg02705.html) is worthy for further discussions.
>
> Best regards,
> Xiaohu
>
>> Does the WG agree? Does anyone have any remaining issues they would like to
>> bring up? Or have issues that they feel have not been adequately addressed yet?
>>
>> If anyone has been meaning to (re)review the document, now would be a good
>> time (and feel free to send a note to the chairs that you'd like a little time to do
>> so).
>>
>> In the absence of specific feedback indicating the document is not ready, we
>> expect to start WGLC prior in the next week or so.
>>
>> Thomas
>>
>> _______________________________________________
>> sfc mailing list
>> sfc@ietf.org
>> https://www.ietf.org/mailman/listinfo/sfc
>
> _______________________________________________
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From nobody Fri Oct 10 12:38:51 2014
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From: Dave Dolson <ddolson@sandvine.com>
To: "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: draft-xu-sfc-using-mpls-spring-01
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Regarding draft-xu-sfc-using-mpls-spring-01,

Sections 3.1 and 3.2 have the same title and similar language.  I think you=
 meant to only use one of them?

Regarding the language, there is this statement?

" Before sending the packet to SF1, the remaining MPLS label
   stack (i.e., a segment list {SID(SF2)}) MUST be stripped.  Upon
   receiving the packet returned from SF1, SFF1 would re-impose the MPLS
   label stack which had been stripped before to the packet,..."

I'm wondering how you envision the SFF could remember what label stack belo=
ngs on a packet?
Keep in mind that an SF could inject packets that it creates; it isn't limi=
ted to forwarding them.
Keep in mind also that an SF may need to respond to a packet with a packet =
in the opposite direction (e.g., a firewall may RST in response to a SYN). =
So the SFF would have to know the label stack for the opposite direction as=
 well.

The only solution I can think of is that there must be a dedicated SF per i=
nstance of label stack. I.e., a dedicated SF per service chain instance.


David Dolson
Senior Software Architect, Sandvine Inc.


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<p class=3D"MsoNormal">Regarding draft-xu-sfc-using-mpls-spring-01,<o:p></o=
:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Sections 3.1 and 3.2 have the same title and similar=
 language. &nbsp;I think you meant to only use one of them?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regarding the language, there is this statement?<o:p=
></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&#8220; Before sending the packet to SF1, the remain=
ing MPLS label<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp; stack (i.e., a segment list {SID(SF2)})=
 MUST be stripped.&nbsp; Upon<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp; receiving the packet returned from SF1,=
 SFF1 would re-impose the MPLS<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp; label stack which had been stripped bef=
ore to the packet,&#8230;&#8221;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I&#8217;m wondering how you envision the SFF could r=
emember what label stack belongs on a packet?<o:p></o:p></p>
<p class=3D"MsoNormal">Keep in mind that an SF could inject packets that it=
 creates; it isn&#8217;t limited to forwarding them.<o:p></o:p></p>
<p class=3D"MsoNormal">Keep in mind also that an SF may need to respond to =
a packet with a packet in the opposite direction (e.g., a firewall may RST =
in response to a SYN). So the SFF would have to know the label stack for th=
e opposite direction as well.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The only solution I can think of is that there must =
be a dedicated SF per instance of label stack. I.e., a dedicated SF per ser=
vice chain instance.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">David Dolson<o:p></o:p></p>
<p class=3D"MsoNormal">Senior Software Architect, Sandvine Inc.<o:p></o:p><=
/p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</body>
</html>

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From: Xuxiaohu <xuxiaohu@huawei.com>
To: Dave Dolson <ddolson@sandvine.com>, "sfc@ietf.org" <sfc@ietf.org>
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Hi David,

Thanks a lot for your valuable comments. Please see my response inline.

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Dave Dolson
Sent: Saturday, October 11, 2014 3:39 AM
To: sfc@ietf.org
Subject: [sfc] draft-xu-sfc-using-mpls-spring-01

Regarding draft-xu-sfc-using-mpls-spring-01,

Sections 3.1 and 3.2 have the same title and similar language.  I think you=
 meant to only use one of them?

[Xiaohu] As for the difference between section 3.1 and section 3.2,  the fo=
rmer describes how to encode the SFP (Service Function Path) information wh=
ile the latter describes who to encode the SFC (Service Function Chain) inf=
ormation.

Regarding the language, there is this statement?

" Before sending the packet to SF1, the remaining MPLS label
   stack (i.e., a segment list {SID(SF2)}) MUST be stripped.  Upon
   receiving the packet returned from SF1, SFF1 would re-impose the MPLS
   label stack which had been stripped before to the packet,..."

I'm wondering how you envision the SFF could remember what label stack belo=
ngs on a packet?

[Xiaohu] As for how the SFF could remember which label stack belongs to whi=
ch returned packet, couldn't the mechanism used by the SF-proxy to correlat=
e the SFC headers with the returned packets be used here?

Keep in mind that an SF could inject packets that it creates; it isn't limi=
ted to forwarding them.
Keep in mind also that an SF may need to respond to a packet with a packet =
in the opposite direction (e.g., a firewall may RST in response to a SYN). =
So the SFF would have to know the label stack for the opposite direction as=
 well.

[Xiaohu] Good comments. We will consider them in the future version. By the=
 way, should the packet originated by the SF travel along a certain SFP?

The only solution I can think of is that there must be a dedicated SF per i=
nstance of label stack. I.e., a dedicated SF per service chain instance.

[Xiaohu] Could you please give us a more detailed illustration?

Best regards,
Xiaohu

David Dolson
Senior Software Architect, Sandvine Inc.


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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;color=
:#1F497D">Hi David,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;color=
:#1F497D">Thanks a lot for your valuable comments. Please see my response i=
nline.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span =
lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&qu=
ot;sans-serif&quot;"> sfc [mailto:sfc-bounces@ietf.org]
<b>On Behalf Of </b>Dave Dolson<br>
<b>Sent:</b> Saturday, October 11, 2014 3:39 AM<br>
<b>To:</b> sfc@ietf.org<br>
<b>Subject:</b> [sfc] draft-xu-sfc-using-mpls-spring-01<o:p></o:p></span></=
p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Regarding draft-xu-sfc-using-mp=
ls-spring-01,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Sections 3.1 and 3.2 have the s=
ame title and similar language. &nbsp;I think you meant to only use one of =
them?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;color=
:#1F497D">[Xiaohu] As for the difference between section 3.1 and section 3.=
2, &nbsp;the former describes how to encode the SFP (Service Function Path)=
 information while the latter describes who
 to encode the SFC (Service Function Chain) information.<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Regarding the language, there i=
s this statement?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&#8220; Before sending the pack=
et to SF1, the remaining MPLS label<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp; stack (i.e., a seg=
ment list {SID(SF2)}) MUST be stripped.&nbsp; Upon<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp; receiving the pack=
et returned from SF1, SFF1 would re-impose the MPLS<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;&nbsp; label stack which =
had been stripped before to the packet,&#8230;&#8221;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I&#8217;m wondering how you env=
ision the SFF could remember what label stack belongs on a packet?<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;color=
:#1F497D">[Xiaohu] As for how the SFF could remember which label stack belo=
ngs to which returned packet, couldn&#8217;t the mechanism used by the SF-p=
roxy to correlate the SFC headers with the returned
 packets be used here?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Keep in mind that an SF could i=
nject packets that it creates; it isn&#8217;t limited to forwarding them.<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Keep in mind also that an SF ma=
y need to respond to a packet with a packet in the opposite direction (e.g.=
, a firewall may RST in response to a SYN). So the SFF would have to know t=
he label stack for the opposite direction
 as well.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;color=
:#1F497D">[Xiaohu] Good comments. We will consider them in the future versi=
on. By the way, should the packet originated by the SF travel along a certa=
in SFP?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The only solution I can think o=
f is that there must be a dedicated SF per instance of label stack. I.e., a=
 dedicated SF per service chain instance.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;color=
:#1F497D">[Xiaohu] Could you please give us a more detailed illustration?<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;color=
:#1F497D">Best regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;color=
:#1F497D">Xiaohu</span><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">David Dolson<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Senior Software Architect, Sand=
vine Inc.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
</div>
</body>
</html>

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From: "Chew, Samuel" <Samuel.Chew@team.telstra.com>
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From: "Ng, Tomy" <Tomy.Ng@team.telstra.com>
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From: Xuxiaohu <xuxiaohu@huawei.com>
To: "Ng, Tomy" <Tomy.Ng@team.telstra.com>, xiechf01 <xiechf01@gmail.com>, huang <huang@sce.carleton.ca>, "Liushucheng (Will)" <liushucheng@huawei.com>, sfc <sfc@ietf.org>
Thread-Topic: Re: [sfc] New Version Notification for draft-liu-sfc-use-cases-08.txt
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--_000_1FEE3F8F5CCDE64C9A8E8F4AD27C19EE082C0C3CNKGEML512MBSchi_
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<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dgb2312">
<style>@font-face {
	font-family: Cambria Math;
}
@font-face {
	font-family: Calibri;
}
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@page WordSection1 {margin: 72.0pt 72.0pt 72.0pt 72.0pt; }
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 fPStyle=3D"1" ocsi=3D"0">
<div style=3D"direction: ltr;font-family: Tahoma;color: #000000;font-size: =
10pt;">
<p>As the draft has pointed out, &quot;Having a single use case document ea=
ses the effort of deriving&nbsp;requirements that are to be met by SFC solu=
tion(s).&nbsp; Moreover, it&nbsp;allows to identify commonalities between t=
he various use cases that<br>
are of interest.&quot; Therefore I support the WG&nbsp;adoption of this dra=
ft too.</p>
<p>&nbsp;</p>
<p>Best regards,</p>
<p>Xiaohu</p>
<div style=3D"FONT-FAMILY: Times New Roman; COLOR: #000000; FONT-SIZE: 16px=
">
<hr tabindex=3D"-1">
<div style=3D"DIRECTION: ltr" id=3D"divRpF297821"><font color=3D"#000000" s=
ize=3D"2" face=3D"Tahoma"><b>=B7=A2=BC=FE=C8=CB:</b> sfc [sfc-bounces@ietf.=
org] =B4=FA=B1=ED Ng, Tomy [Tomy.Ng@team.telstra.com]<br>
<b>=B7=A2=CB=CD=CA=B1=BC=E4:</b> 2014=C4=EA10=D4=C213=C8=D5 14:46<br>
<b>=CA=D5=BC=FE=C8=CB:</b> xiechf01; huang; Liushucheng (Will); sfc<br>
<b>=B3=AD=CB=CD:</b> draft-liu-sfc-use-cases<br>
<b>=D6=F7=CC=E2:</b> Re: [sfc] New Version Notification for draft-liu-sfc-u=
se-cases-08.txt<br>
</font><br>
</div>
<div></div>
<div>
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: 'Calibri','sans-serif'; =
COLOR: #1f497d; FONT-SIZE: 11pt">HI All,</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: 'Calibri','sans-serif'; =
COLOR: #1f497d; FONT-SIZE: 11pt">I fully support this draft, it is timely a=
nd covers use cases over fixed, mobile and cloud.</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: 'Calibri','sans-serif'; =
COLOR: #1f497d; FONT-SIZE: 11pt">Cheers</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: 'Calibri','sans-serif'; =
COLOR: #1f497d; FONT-SIZE: 11pt">Tomy Ng</span></p>
<p class=3D"MsoNormal"><span style=3D"FONT-FAMILY: 'Calibri','sans-serif'; =
COLOR: #1f497d; FONT-SIZE: 11pt"></span>&nbsp;</p>
<div>
<div style=3D"BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING=
-BOTTOM: 0cm; PADDING-LEFT: 0cm; PADDING-RIGHT: 0cm; BORDER-TOP: #b5c4df 1p=
t solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><b><span style=3D"FONT=
-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt" lang=3D"EN-US">From:</span=
></b><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt" la=
ng=3D"EN-US"> xiechf01 [mailto:xiechf01@gmail.com]
<br>
<b>Sent:</b> Sunday, 21 September 2014 4:44 PM<br>
<b>To:</b> huang; Will Liu (Shucheng); sfc<br>
<b>Cc:</b> draft-liu-sfc-use-cases<br>
<b>Subject:</b> Re: Re: [sfc] New Version Notification for draft-liu-sfc-us=
e-cases-08.txt</span></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;</p>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Consi=
dering that use case document&nbsp;is essential for the operators to unders=
tand and accept new technologies,such as SFC,
 and this document has been improved based on the comments in last SFC meet=
ing, and it&nbsp; has coverd major cases that operators are concerned, so I=
 think this current document is very comprehensive and meaning.
</span></p>
</div>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Chong=
feng Xie</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div style=3D"BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING=
-BOTTOM: 0cm; PADDING-LEFT: 0cm; PADDING-RIGHT: 0cm; BORDER-TOP: #b5c4df 1p=
t solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt; BACKGROUND: #efefef" class=3D"MsoNormal"><=
b><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SIZ=
E: 9pt">From:</span></b><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; =
COLOR: black; FONT-SIZE: 9pt">&nbsp;<a href=3D"mailto:huang@sce.carleton.ca=
" target=3D"_blank">Changcheng
 Huang</a></span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt; BACKGROUND: #efefef" class=3D"MsoNormal"><=
b><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SIZ=
E: 9pt">Date:</span></b><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; =
COLOR: black; FONT-SIZE: 9pt">&nbsp;2014-09-17&nbsp;20:44</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt; BACKGROUND: #efefef" class=3D"MsoNormal"><=
b><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SIZ=
E: 9pt">To:</span></b><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; CO=
LOR: black; FONT-SIZE: 9pt">&nbsp;<a href=3D"mailto:liushucheng@huawei.com"=
 target=3D"_blank">'Liushucheng
 \(Will\)'</a>; <a href=3D"mailto:sfc@ietf.org" target=3D"_blank">sfc@ietf.=
org</a></span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt; BACKGROUND: #efefef" class=3D"MsoNormal"><=
b><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SIZ=
E: 9pt">CC:</span></b><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; CO=
LOR: black; FONT-SIZE: 9pt">&nbsp;<a href=3D"mailto:draft-liu-sfc-use-cases=
@tools.ietf.org" target=3D"_blank">draft-liu-sfc-use-cases</a></span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt; BACKGROUND: #efefef" class=3D"MsoNormal"><=
b><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: black; FONT-SIZ=
E: 9pt">Subject:</span></b><span style=3D"FONT-FAMILY: 'Tahoma','sans-serif=
'; COLOR: black; FONT-SIZE: 9pt">&nbsp;Re: [sfc]
 New Version Notification for draft-liu-sfc-use-cases-08.txt</span></p>
</div>
</div>
</div>
<div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">I thi=
nk the draft has significantly improved. Those who are against adopting thi=
s draft should clearly state why they
 are against so that the authors can further improve the draft. Otherwise t=
hey should be considered support as the chairs have been doing for other dr=
afts.</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Regar=
ds,</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Chang=
</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">-----=
Original Message-----</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">From:=
 Liushucheng (Will) [<a href=3D"mailto:liushucheng@huawei.com" target=3D"_b=
lank">mailto:liushucheng@huawei.com</a>]
</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Sent:=
 Wednesday, September 17, 2014 7:25 AM</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">To:
<a href=3D"mailto:sfc@ietf.org" target=3D"_blank">sfc@ietf.org</a></span></=
p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Cc:
<a href=3D"mailto:draft-liu-sfc-use-cases@tools.ietf.org" target=3D"_blank"=
>draft-liu-sfc-use-cases@tools.ietf.org</a></span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Subje=
ct: FW: New Version Notification for draft-liu-sfc-use-cases-08.txt</span><=
/p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Hi al=
l,</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Accor=
ding to the minutes of last IETF meeting:</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Thoma=
s Narten: There was a fair amount of support earlier to have one document. =
Now there are other use case drafts. It
 is up to the WG to decide how to go forward.</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">(?): =
Document is very comprehensive and useful for operators.</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Ken G=
ray: Agree with Thomas. With multiple documents its hard to find unique req=
uirements across many. That is what I
 would like to see.</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">(?): =
Good for WG adoption.</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Jim G=
uichard: How many have read the document? About 20.</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Thoma=
s Narten: Should we have separate document? How many like to adopt vs not a=
dopt? No clear consensus in the room for
 adoption. Continue to discuss on-list.</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">In la=
st IETF meeting, there were around 20 persons who supported to adopt this d=
raft. As suggested by Chairs, we updated
 our draft and wish to continue the discussion here to get more people supp=
ort us. The main changes are:</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">1. Cu=
t the problems listed in mobile use case</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">2. Ad=
dressed the comments from Dave Dolson about the bidirectional link.</span><=
/p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">3. Up=
dated the reference.</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Pleas=
e let us know your thought, thanks!</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Regar=
ds,</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Will<=
/span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">-----=
Original Message-----</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">From:
<a href=3D"mailto:internet-drafts@ietf.org" target=3D"_blank">internet-draf=
ts@ietf.org</a> [<a href=3D"mailto:internet-drafts@ietf.org" target=3D"_bla=
nk">mailto:internet-drafts@ietf.org</a>]
</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Sent:=
 Wednesday, September 17, 2014 6:58 PM</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">To: Q=
iong Sun; Jiafeng Zhu; Changcheng Huang; Nicolai Leymann; Hongyu Li (Julio)=
; Liushucheng (Will); Fu Qiao; Qiong Sun;
 Peng He; Qiao Fu; Changcheng Huang; Mohamed Boucadair; Nicolai Leymann; Hu=
angyong (Oliver); Mohamed Boucadair; Peng He; Chuong Pham; Jiafeng Zhu; Liu=
shucheng (Will); Hongyu Li (Julio); Chuong Pham; Huangyong (Oliver)</span><=
/p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Subje=
ct: New Version Notification for draft-liu-sfc-use-cases-08.txt</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">A new=
 version of I-D, draft-liu-sfc-use-cases-08.txt has been successfully submi=
tted by Will(Shucheng) Liu and posted
 to the IETF repository.</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Name:=
 draft-liu-sfc-use-cases</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Revis=
ion: 08</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Title=
: Service Function Chaining (SFC) General Use Cases</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Docum=
ent date: 2014-09-17</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Group=
: Individual Submission</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Pages=
: 19</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">URL:&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<a href=3D"http://www.ietf.org/internet-drafts/draft-liu-sfc-use-cases-08.t=
xt" target=3D"_blank">
http://www.ietf.org/internet-drafts/draft-liu-sfc-use-cases-08.txt</a></spa=
n></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Statu=
s:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<a href=3D"https://datatracker.ietf.org/doc/draft-liu-sfc-use-cases/" targe=
t=3D"_blank">
https://datatracker.ietf.org/doc/draft-liu-sfc-use-cases/</a></span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Htmli=
zed:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<a href=3D"http://tools.ietf.org/html/draft-liu-sfc-use-cases-08" target=3D=
"_blank">http://tools.ietf.org/html/draft-liu-sfc-use-cases-08</a></span></=
p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Diff:=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<a href=3D"http://www.ietf.org/rfcdiff?url2=3Ddraft-liu-sfc-use-cases-08" t=
arget=3D"_blank">
http://www.ietf.org/rfcdiff?url2=3Ddraft-liu-sfc-use-cases-08</a></span></p=
>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Abstr=
act:</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">&nbsp=
;&nbsp; The delivery of value-added services relies on the invocation of</s=
pan></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">&nbsp=
;&nbsp; advanced Service Functions in a sequential order.&nbsp; This mechan=
ism is</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">&nbsp=
;&nbsp; called Service Function Chaining (SFC).&nbsp; The set of involved S=
ervice</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">&nbsp=
;&nbsp; Functions and their order depends on the service context and other<=
/span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">&nbsp=
;&nbsp; deployment-specific considerations.</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">&nbsp=
;&nbsp; Having a single use case document eases the effort of deriving</spa=
n></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">&nbsp=
;&nbsp; requirements that are to be met by SFC solution(s).&nbsp; Moreover,=
 it</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">&nbsp=
;&nbsp; allows to identify commonalities between the various use cases that=
</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">&nbsp=
;&nbsp; are of interest.&nbsp; This document presents a set of general use =
cases</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">&nbsp=
;&nbsp; of Service Function Chaining (SFC).</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Pleas=
e note that it may take a couple of minutes from the time of submission unt=
il the htmlized version and diff are available
 at tools.ietf.org.</span></p>
</div>
<div>
<p style=3D"MARGIN: 0cm 0cm 0pt" class=3D"MsoNormal"><span style=3D"FONT-FA=
MILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></spa=
n>&nbsp;</p>
</div>
<div>
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Support.


(although, this does feel like "Posting 'me too' like some brain-dead AOLer=
". =C2=A0Just don't "Do the world a favor and cap [me] like Old Yeller".)









=20



-----Original Message-----



From:
internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]




Sent: Wednesday, September 17, 2014 6:58 PM



To: Qiong Sun; Jiafeng Zhu; Changcheng Huang; Nicolai Leymann; Hongyu Li (J=
ulio); Liushucheng (Will); Fu Qiao; Qiong Sun;
 Peng He; Qiao Fu; Changcheng Huang; Mohamed Boucadair; Nicolai Leymann; Hu=
angyong (Oliver); Mohamed Boucadair; Peng He; Chuong Pham; Jiafeng Zhu; Liu=
shucheng (Will); Hongyu Li (Julio); Chuong Pham; Huangyong (Oliver)



Subject: New Version Notification for draft-liu-sfc-use-cases-08.txt



=20



=20



A new version of I-D, draft-liu-sfc-use-cases-08.txt has been successfully =
submitted by Will(Shucheng) Liu and posted
 to the IETF repository.



=20



Name: draft-liu-sfc-use-cases



Revision: 08



Title: Service Function Chaining (SFC) General Use Cases



Document date: 2014-09-17



Group: Individual Submission



Pages: 19



URL:          =20

http://www.ietf.org/internet-drafts/draft-liu-sfc-use-cases-08.txt



Status:       =20

https://datatracker.ietf.org/doc/draft-liu-sfc-use-cases/



Htmlized:     =20
http://tools.ietf.org/html/draft-liu-sfc-use-cases-08



Diff:         =20

http://www.ietf.org/rfcdiff?url2=3Ddraft-liu-sfc-use-cases-08



=20



Abstract:



   The delivery of value-added services relies on the invocation of



   advanced Service Functions in a sequential order.  This mechanism is



   called Service Function Chaining (SFC).  The set of involved Service



   Functions and their order depends on the service context and other



   deployment-specific considerations.



=20



   Having a single use case document eases the effort of deriving



   requirements that are to be met by SFC solution(s).  Moreover, it



   allows to identify commonalities between the various use cases that



   are of interest.  This document presents a set of general use cases



   of Service Function Chaining (SFC).



=20



                                                                           =
     =20




=20



=20



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



=20



The IETF Secretariat



=20



=20



=20



_______________________________________________



sfc mailing list



sfc@ietf.org



https://www.ietf.org/mailman/listinfo/sfc








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<font face="'courier new', monospace" size="2"><div>Support.</div><div><br></div><div>(although, this does feel like "Posting 'me too' like some brain-dead AOLer". &nbsp;Just don't "Do the world a favor and cap [me] like Old Yeller".)<br><br></div></font><div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;"><div style="FONT-FAMILY: Times New Roman; COLOR: #000000; FONT-SIZE: 16px"><div><div class="WordSection1"><div><div><br>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></span> </p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">-----Original Message-----</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">From:
<a href="mailto:internet-drafts@ietf.org" target="_blank">internet-drafts@ietf.org</a> [<a href="mailto:internet-drafts@ietf.org" target="_blank">mailto:internet-drafts@ietf.org</a>]
</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Sent: Wednesday, September 17, 2014 6:58 PM</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">To: Qiong Sun; Jiafeng Zhu; Changcheng Huang; Nicolai Leymann; Hongyu Li (Julio); Liushucheng (Will); Fu Qiao; Qiong Sun;
 Peng He; Qiao Fu; Changcheng Huang; Mohamed Boucadair; Nicolai Leymann; Huangyong (Oliver); Mohamed Boucadair; Peng He; Chuong Pham; Jiafeng Zhu; Liushucheng (Will); Hongyu Li (Julio); Chuong Pham; Huangyong (Oliver)</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Subject: New Version Notification for draft-liu-sfc-use-cases-08.txt</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></span> </p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></span> </p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">A new version of I-D, draft-liu-sfc-use-cases-08.txt has been successfully submitted by Will(Shucheng) Liu and posted
 to the IETF repository.</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></span> </p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Name: draft-liu-sfc-use-cases</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Revision: 08</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Title: Service Function Chaining (SFC) General Use Cases</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Document date: 2014-09-17</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Group: Individual Submission</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Pages: 19</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">URL:           
<a href="http://www.ietf.org/internet-drafts/draft-liu-sfc-use-cases-08.txt" target="_blank">
http://www.ietf.org/internet-drafts/draft-liu-sfc-use-cases-08.txt</a></span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Status:        
<a href="https://datatracker.ietf.org/doc/draft-liu-sfc-use-cases/" target="_blank">
https://datatracker.ietf.org/doc/draft-liu-sfc-use-cases/</a></span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Htmlized:      
<a href="http://tools.ietf.org/html/draft-liu-sfc-use-cases-08" target="_blank">http://tools.ietf.org/html/draft-liu-sfc-use-cases-08</a></span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Diff:          
<a href="http://www.ietf.org/rfcdiff?url2=draft-liu-sfc-use-cases-08" target="_blank">
http://www.ietf.org/rfcdiff?url2=draft-liu-sfc-use-cases-08</a></span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></span> </p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Abstract:</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">   The delivery of value-added services relies on the invocation of</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">   advanced Service Functions in a sequential order.  This mechanism is</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">   called Service Function Chaining (SFC).  The set of involved Service</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">   Functions and their order depends on the service context and other</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">   deployment-specific considerations.</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></span> </p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">   Having a single use case document eases the effort of deriving</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">   requirements that are to be met by SFC solution(s).  Moreover, it</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">   allows to identify commonalities between the various use cases that</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">   are of interest.  This document presents a set of general use cases</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">   of Service Function Chaining (SFC).</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></span> </p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">                                                                                 
</span></p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></span> </p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt"></span> </p>
</div>
<div>
<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-FAMILY: 'Microsoft YaHei','sans-serif'; COLOR: navy; FONT-SIZE: 10.5pt">Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available
 at tools.ietf.org.</span></p>
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To: "Liushucheng (Will)" <liushucheng@huawei.com>, sfc <sfc@ietf.org>
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From nobody Wed Oct 15 12:35:20 2014
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From: Dave Dolson <ddolson@sandvine.com>
To: Xuxiaohu <xuxiaohu@huawei.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: draft-xu-sfc-using-mpls-spring-01
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Date: Wed, 15 Oct 2014 19:35:13 +0000
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References: <E8355113905631478EFF04F5AA706E9830ABE310@wtl-exchp-2.sandvine.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE082C0578@NKGEML512-MBS.china.huawei.com>
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Inline [DDolson]

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Xuxiaohu
Sent: Friday, October 10, 2014 10:12 PM
To: Dave Dolson; sfc@ietf.org
Subject: Re: [sfc] draft-xu-sfc-using-mpls-spring-01

Hi David,

Thanks a lot for your valuable comments. Please see my response inline.

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Dave Dolson
Sent: Saturday, October 11, 2014 3:39 AM
To: sfc@ietf.org<mailto:sfc@ietf.org>
Subject: [sfc] draft-xu-sfc-using-mpls-spring-01

Regarding draft-xu-sfc-using-mpls-spring-01,

Sections 3.1 and 3.2 have the same title and similar language.  I think you=
 meant to only use one of them?

[Xiaohu] As for the difference between section 3.1 and section 3.2,  the fo=
rmer describes how to encode the SFP (Service Function Path) information wh=
ile the latter describes who to encode the SFC (Service Function Chain) inf=
ormation.

Regarding the language, there is this statement?

" Before sending the packet to SF1, the remaining MPLS label
   stack (i.e., a segment list {SID(SF2)}) MUST be stripped.  Upon
   receiving the packet returned from SF1, SFF1 would re-impose the MPLS
   label stack which had been stripped before to the packet,..."

I'm wondering how you envision the SFF could remember what label stack belo=
ngs on a packet?

[Xiaohu] As for how the SFF could remember which label stack belongs to whi=
ch returned packet, couldn't the mechanism used by the SF-proxy to correlat=
e the SFC headers with the returned packets be used here?
[DDolson] You are right, this is the same problem. The architecture calls t=
his a "local attachment circuit", out of scope. Your document says the labe=
l stack is to be stripped without mentioning any sort of local attachment c=
ircuit. I believe your document says that simple IP packets can be sent to =
the SF.

Keep in mind that an SF could inject packets that it creates; it isn't limi=
ted to forwarding them.
Keep in mind also that an SF may need to respond to a packet with a packet =
in the opposite direction (e.g., a firewall may RST in response to a SYN). =
So the SFF would have to know the label stack for the opposite direction as=
 well.

[Xiaohu] Good comments. We will consider them in the future version. By the=
 way, should the packet originated by the SF travel along a certain SFP?
[DDolson] Yes, the path taken by new (RST) packet must take the exact rever=
se of the path taken by the original packet. This example also applies to a=
 cache that is returning cached content to the client that didn't come from=
 the server.
Example:  client sends SYN; SYN packet goes through a firewall, then to a c=
ache; cache returns SYN-ACK; the SYN-ACK must travel the reverse chain via =
the firewall before returning to the client.

The only solution I can think of is that there must be a dedicated SF per i=
nstance of label stack. I.e., a dedicated SF per service chain instance.

[Xiaohu] Could you please give us a more detailed illustration?
[DDolson] A packet arrives from the SF to the SFF, and the SFF must choose =
a label stack to put on it. This can be decided by network interface to cho=
ose the "left" or "right" label stack. Therefore only one bidirectional cha=
in can be supported.
However, if the SFF tags the packets with VLANs, and the SF preserves VLANs=
 (by remembering which VLAN a layer4 connection belongs with), VLAN can als=
o be used by the SFF to select the label stack. This would allow an SF to s=
upport 4096 bidirectional chains.
The VLAN approach is one example of local attachment circuit allowing a sin=
gle SF to support multiple chains.

Best regards,
Xiaohu

David Dolson
Senior Software Architect, Sandvine Inc.


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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Inline </span><span st=
yle=3D"color:#00B050">[DDolson]</span><span style=3D"color:#1F497D"><o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></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;"> sfc [mai=
lto:sfc-bounces@ietf.org]
<b>On Behalf Of </b>Xuxiaohu<br>
<b>Sent:</b> Friday, October 10, 2014 10:12 PM<br>
<b>To:</b> Dave Dolson; sfc@ietf.org<br>
<b>Subject:</b> Re: [sfc] draft-xu-sfc-using-mpls-spring-01<o:p></o:p></spa=
n></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;color:#1F497D">Hi Da=
vid,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;color:#1F497D">Thank=
s a lot for your valuable comments. Please see my response inline.<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #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;"> sfc [<a =
href=3D"mailto:sfc-bounces@ietf.org">mailto:sfc-bounces@ietf.org</a>]
<b>On Behalf Of </b>Dave Dolson<br>
<b>Sent:</b> Saturday, October 11, 2014 3:39 AM<br>
<b>To:</b> <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<b>Subject:</b> [sfc] draft-xu-sfc-using-mpls-spring-01<o:p></o:p></span></=
p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regarding draft-xu-sfc-using-mpls-spring-01,<o:p></o=
:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Sections 3.1 and 3.2 have the same title and similar=
 language. &nbsp;I think you meant to only use one of them?<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;color:#1F497D">[Xiao=
hu] As for the difference between section 3.1 and section 3.2, &nbsp;the fo=
rmer describes how to encode the SFP (Service Function Path) information wh=
ile the latter describes who to encode the
 SFC (Service Function Chain) information.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regarding the language, there is this statement?<o:p=
></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&#8220; Before sending the packet to SF1, the remain=
ing MPLS label<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp; stack (i.e., a segment list {SID(SF2)})=
 MUST be stripped.&nbsp; Upon<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp; receiving the packet returned from SF1,=
 SFF1 would re-impose the MPLS<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp; label stack which had been stripped bef=
ore to the packet,&#8230;&#8221;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I&#8217;m wondering how you envision the SFF could r=
emember what label stack belongs on a packet?<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;color:#1F497D">[Xiao=
hu] As for how the SFF could remember which label stack belongs to which re=
turned packet, couldn&#8217;t the mechanism used by the SF-proxy to correla=
te the SFC headers with the returned packets
 be used here?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#00B050">[DDolson] You are righ=
t, this is the same problem. The architecture calls this a &#8220;local att=
achment circuit&#8221;, out of scope. Your document says the label stack is=
 to be stripped without mentioning any sort of local
 attachment circuit. I believe your document says that simple IP packets ca=
n be sent to the SF.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal">Keep in mind that an SF could inject packets that it=
 creates; it isn&#8217;t limited to forwarding them.<o:p></o:p></p>
<p class=3D"MsoNormal">Keep in mind also that an SF may need to respond to =
a packet with a packet in the opposite direction (e.g., a firewall may RST =
in response to a SYN). So the SFF would have to know the label stack for th=
e opposite direction as well.<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;color:#1F497D">[Xiao=
hu] Good comments. We will consider them in the future version. By the way,=
 should the packet originated by the SF travel along a certain SFP?<o:p></o=
:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#00B050">[DDolson] Yes, the pat=
h taken by new (RST) packet must take the exact reverse of the path taken b=
y the original packet. This example also applies to a cache that is returni=
ng cached content to the client that
 didn&#8217;t come from the server.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#00B050">Example: &nbsp;client =
sends SYN; SYN packet goes through a firewall, then to a cache; cache retur=
ns SYN-ACK; the SYN-ACK must travel the reverse chain via the firewall befo=
re returning to the client.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The only solution I can think of is that there must =
be a dedicated SF per instance of label stack. I.e., a dedicated SF per ser=
vice chain instance.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;color:#1F497D">[Xiao=
hu] Could you please give us a more detailed illustration?<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"color:#00B050">[DDolson] A packet arr=
ives from the SF to the SFF, and the SFF must choose a label stack to put o=
n it. This can be decided by network interface to choose the &#8220;left&#8=
221; or &#8220;right&#8221; label stack. Therefore only one
 bidirectional chain can be supported.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#00B050">However, if the SFF ta=
gs the packets with VLANs, and the SF preserves VLANs (by remembering which=
 VLAN a layer4 connection belongs with), VLAN can also be used by the SFF t=
o select the label stack. This would
 allow an SF to support 4096 bidirectional chains.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#00B050">The VLAN approach is o=
ne example of local attachment circuit allowing a single SF to support mult=
iple chains.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;color:#1F497D">Best =
regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;color:#1F497D">Xiaoh=
u</span><span style=3D"color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;color:#1F497D"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal">David Dolson<o:p></o:p></p>
<p class=3D"MsoNormal">Senior Software Architect, Sandvine Inc.<o:p></o:p><=
/p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
</body>
</html>

--_000_E8355113905631478EFF04F5AA706E9830AC2A5Fwtlexchp2sandvi_--


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From: Stuart Mackie <wsmackie@juniper.net>
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Thread-Topic: New Version Notification for draft-mackie-sfc-using-virtual-networking-02.txt
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Content-Type: text/plain; charset="iso-8859-1"
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Hi Everybody


The purpose of this draft is to act as an existence proof that shows that S=
FCs can be implemented using existing protocols and existing router functio=
nality when a controller is used to manage SFC topologies. The document use=
s MPLS over GRE as an example encapsulation protocol, and shows how SFCs ca=
n be implemented using both physical and virtualized forwarding functions. =
There is also discussion of load balancing and how to deal with forward and=
 reverse flow symmetry and service scaling.


(It's version -02 since I took care of editing a few errors).


Comments welcome?.


Stuart


................................

Stuart Mackie
SDN/NFV Architect

+1 914 886 2534
________________________________
From: internet-drafts@ietf.org <internet-drafts@ietf.org>
Sent: Friday, October 17, 2014 4:52 PM
To: Maria Napierala; Maria Napierala; Bruno Rijsman; Diego Daino; EXT - dan=
iel.bernier@bell.ca; Stuart Mackie; Diego R.Lopez; Stuart Mackie; Diego R. =
Lopez; EXT - daniel.bernier@bell.ca; Diego Daino; Walter Haeffner; Bruno Ri=
jsman; Walter Haeffner
Subject: New Version Notification for draft-mackie-sfc-using-virtual-networ=
king-02.txt


A new version of I-D, draft-mackie-sfc-using-virtual-networking-02.txt
has been successfully submitted by Stuart Mackie and posted to the
IETF repository.

Name:           draft-mackie-sfc-using-virtual-networking
Revision:       02
Title:          Service Function Chains Using Virtual Networking
Document date:  2014-10-17
Group:          Individual Submission
Pages:          44
URL:            http://www.ietf.org/internet-drafts/draft-mackie-sfc-using-=
virtual-networking-02.txt
Status:         https://datatracker.ietf.org/doc/draft-mackie-sfc-using-vir=
tual-networking/
Htmlized:       http://tools.ietf.org/html/draft-mackie-sfc-using-virtual-n=
etworking-02
Diff:           http://www.ietf.org/rfcdiff?url2=3Ddraft-mackie-sfc-using-v=
irtual-networking-02

Abstract:
   This document describes how service function chains (SFC) can be
   applied to traffic flows using routing in a virtual (overlay)
   network to steer traffic between service nodes. Chains can include
   services running in routers, on physical appliances or in virtual
   machines. Service chains have applicability at the subscriber edge,
   business edge and in multi-tenant datacenters. The routing function
   into SFCs and between service functions within an SFC can be
   performed by physical devices (routers), be virtualized inside
   hypervisors, or run as part of a host OS.

   The architecture uses a controller to calculate and install routes
   to implement an SFC, based on a topological model of the chain and
   knowledge of the network addresses that should pass through the
   chain. An advantage of the approach is that SFCs can be implemented
   without alteration to today's BGP standard, and without change to
   the current operation of routers.

   Service chains need to support load balancing between network
   functions, and symmetric forward and reverse paths are required when
   stateful services are involved. This document shows how these
   requirements can be met by using VRFs at the ingress and egress of
   each service instance and by performing load balancing after the
   egress of each service as part of the routing function.




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

The IETF Secretariat


--_000_141358015196657366junipernet_
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" style=3D"display:none"><!-- p { margin-top: 0px; m=
argin-bottom: 0px; } .EmailQuote { margin-left: 1pt; padding-left: 4pt; bor=
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<body dir=3D"ltr" style=3D"font-size:10pt;color:#000000;background-color:#F=
FFFFF;font-family:Calibri,Arial,Helvetica,sans-serif;">
<p>Hi Everybody<br>
</p>
<p><br>
</p>
<p>The purpose of this draft is to act as an existence proof that&nbsp;show=
s that SFCs can be implemented using existing protocols and&nbsp;existing r=
outer functionality when a controller is used to manage SFC topologies. The=
 document uses MPLS over GRE as an example
 encapsulation protocol, and shows how SFCs can be implemented using&nbsp;b=
oth physical and virtualized forwarding functions. There is also discussion=
 of load balancing and how to deal&nbsp;with forward and reverse flow symme=
try and service scaling.<br>
</p>
<p><br>
</p>
<p>(It's version -02 since I took care of editing&nbsp;a few errors).<br>
</p>
<p><br>
</p>
<p>Comments welcome&#8203;.<br>
</p>
<p><br>
</p>
<p>Stuart<br>
</p>
<p><br>
</p>
<div id=3D"Signature">
<div name=3D"divtagdefaultwrapper" style=3D"font-family:Calibri,Arial,Helve=
tica,sans-serif; font-size:; margin:0">
<div style=3D"font-family:Calibri,sans-serif; font-size:14px"><font color=
=3D"#595959" face=3D"Arial"><span style=3D"font-size:13px"><b>&#8230;&#8230=
;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;..</b></span></fon=
t></div>
<div style=3D"font-family:Calibri,sans-serif; font-size:14px"><font color=
=3D"#595959" face=3D"Arial"><span style=3D"font-size:13px"><b><br>
</b></span></font></div>
<div style=3D"font-family:Calibri,sans-serif; font-size:14px"><font face=3D=
"Arial" size=3D"2" color=3D"#595959"><span style=3D"font-size:10pt"><b>Stua=
rt Mackie<br>
</b></span></font><font face=3D"Arial" size=3D"2" color=3D"#595959"><span s=
tyle=3D"font-size:10pt"><i>SDN/NFV Architect<br>
<br>
</i></span></font><font face=3D"Arial" size=3D"2" color=3D"#595959"><span s=
tyle=3D"font-size:9pt">&#43;1 914 886 2534</span></font></div>
</div>
</div>
<div style=3D"color: rgb(33, 33, 33);">
<div>
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"x_divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" =
color=3D"#000000" style=3D"font-size:11pt"><b>From:</b> internet-drafts@iet=
f.org &lt;internet-drafts@ietf.org&gt;<br>
<b>Sent:</b> Friday, October 17, 2014 4:52 PM<br>
<b>To:</b> Maria Napierala; Maria Napierala; Bruno Rijsman; Diego Daino; EX=
T - daniel.bernier@bell.ca; Stuart Mackie; Diego R.Lopez; Stuart Mackie; Di=
ego R. Lopez; EXT - daniel.bernier@bell.ca; Diego Daino; Walter Haeffner; B=
runo Rijsman; Walter Haeffner<br>
<b>Subject:</b> New Version Notification for draft-mackie-sfc-using-virtual=
-networking-02.txt</font>
<div>&nbsp;</div>
</div>
</div>
<font size=3D"2"><span style=3D"font-size:10pt">
<div class=3D"PlainText"><br>
A new version of I-D, draft-mackie-sfc-using-virtual-networking-02.txt<br>
has been successfully submitted by Stuart Mackie and posted to the<br>
IETF repository.<br>
<br>
Name:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; draft-mac=
kie-sfc-using-virtual-networking<br>
Revision:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 02<br>
Title:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Service Functi=
on Chains Using Virtual Networking<br>
Document date:&nbsp; 2014-10-17<br>
Group:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Individual Sub=
mission<br>
Pages:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 44<br>
URL:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a h=
ref=3D"http://www.ietf.org/internet-drafts/draft-mackie-sfc-using-virtual-n=
etworking-02.txt">
http://www.ietf.org/internet-drafts/draft-mackie-sfc-using-virtual-networki=
ng-02.txt</a><br>
Status:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"https://=
datatracker.ietf.org/doc/draft-mackie-sfc-using-virtual-networking/">
https://datatracker.ietf.org/doc/draft-mackie-sfc-using-virtual-networking/=
</a><br>
Htmlized:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"http://tools.ietf.=
org/html/draft-mackie-sfc-using-virtual-networking-02">
http://tools.ietf.org/html/draft-mackie-sfc-using-virtual-networking-02</a>=
<br>
Diff:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=
=3D"http://www.ietf.org/rfcdiff?url2=3Ddraft-mackie-sfc-using-virtual-netwo=
rking-02">
http://www.ietf.org/rfcdiff?url2=3Ddraft-mackie-sfc-using-virtual-networkin=
g-02</a><br>
<br>
Abstract:<br>
&nbsp;&nbsp; This document describes how service function chains (SFC) can =
be<br>
&nbsp;&nbsp; applied to traffic flows using routing in a virtual (overlay)<=
br>
&nbsp;&nbsp; network to steer traffic between service nodes. Chains can inc=
lude<br>
&nbsp;&nbsp; services running in routers, on physical appliances or in virt=
ual<br>
&nbsp;&nbsp; machines. Service chains have applicability at the subscriber =
edge,<br>
&nbsp;&nbsp; business edge and in multi-tenant datacenters. The routing fun=
ction<br>
&nbsp;&nbsp; into SFCs and between service functions within an SFC can be<b=
r>
&nbsp;&nbsp; performed by physical devices (routers), be virtualized inside=
<br>
&nbsp;&nbsp; hypervisors, or run as part of a host OS.<br>
<br>
&nbsp;&nbsp; The architecture uses a controller to calculate and install ro=
utes<br>
&nbsp;&nbsp; to implement an SFC, based on a topological model of the chain=
 and<br>
&nbsp;&nbsp; knowledge of the network addresses that should pass through th=
e<br>
&nbsp;&nbsp; chain. An advantage of the approach is that SFCs can be implem=
ented<br>
&nbsp;&nbsp; without alteration to today's BGP standard, and without change=
 to<br>
&nbsp;&nbsp; the current operation of routers.<br>
<br>
&nbsp;&nbsp; Service chains need to support load balancing between network<=
br>
&nbsp;&nbsp; functions, and symmetric forward and reverse paths are require=
d when<br>
&nbsp;&nbsp; stateful services are involved. This document shows how these<=
br>
&nbsp;&nbsp; requirements can be met by using VRFs at the ingress and egres=
s of<br>
&nbsp;&nbsp; each service instance and by performing load balancing after t=
he<br>
&nbsp;&nbsp; egress of each service as part of the routing function.<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at tools.ietf.org.<br>
<br>
The IETF Secretariat<br>
<br>
</div>
</span></font></div>
</body>
</html>

--_000_141358015196657366junipernet_--


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From Michael.Huang@team.telstra.com  Mon Oct 20 16:05:45 2014
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From: "Huang, Michael" <Michael.Huang@team.telstra.com>
To: xiechf01 <xiechf01@gmail.com>, huang <huang@sce.carleton.ca>, "Will Liu (Shucheng)" <liushucheng@huawei.com>, sfc <sfc@ietf.org>
Date: Tue, 21 Oct 2014 10:05:37 +1100
Thread-Topic: Re: [sfc] New Version Notification for draft-liu-sfc-use-cases-08.txt
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From: "Reinaldo Penno (repenno)" <repenno@cisco.com>
To: "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: Service Function Chaining Yang Model v08
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Thanks,

On 10/23/14, 3:19 AM, "internet-drafts@ietf.org"
<internet-drafts@ietf.org> wrote:

>
>A new version of I-D, draft-penno-sfc-yang-08.txt
>has been successfully submitted by Reinaldo Penno and posted to the
>IETF repository.
>
>Name:		draft-penno-sfc-yang
>Revision:	08
>Title:		Yang Data Model for Service Function Chaining
>Document date:	2014-10-23
>Group:		Individual Submission
>Pages:		35
>URL:           =20
>http://www.ietf.org/internet-drafts/draft-penno-sfc-yang-08.txt
>Status:         https://datatracker.ietf.org/doc/draft-penno-sfc-yang/
>Htmlized:       http://tools.ietf.org/html/draft-penno-sfc-yang-08
>Diff:           http://www.ietf.org/rfcdiff?url2=3Ddraft-penno-sfc-yang-08
>
>Abstract:
>   This document defines a YANG data model that can be used to configure
>   and manage Service Function Chains.
>
>
>                 =20
>       =20
>
>
>Please note that it may take a couple of minutes from the time of
>submission
>until the htmlized version and diff are available at tools.ietf.org.
>
>The IETF Secretariat
>


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From: "Surendra Kumar (smkumar)" <smkumar@cisco.com>
To: "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: New Version Notification for draft-kumar-sfc-sfp-optimization-01.txt
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Subject: [sfc] FW: New Version Notification for draft-kumar-sfc-sfp-optimization-01.txt
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An updated revision of the offloads draft.

Thanks,
Surendra.

On 10/24/14 10:43 AM, "internet-drafts@ietf.org"
<internet-drafts@ietf.org> wrote:

>
>A new version of I-D, draft-kumar-sfc-sfp-optimization-01.txt
>has been successfully submitted by Surendra Kumar and posted to the
>IETF repository.
>
>Name:		draft-kumar-sfc-sfp-optimization
>Revision:	01
>Title:		Service Function Path Optimization
>Document date:	2014-10-24
>Group:		Individual Submission
>Pages:		15
>URL:           =20
>http://www.ietf.org/internet-drafts/draft-kumar-sfc-sfp-optimization-01.tx
>t
>Status:        =20
>https://datatracker.ietf.org/doc/draft-kumar-sfc-sfp-optimization/
>Htmlized:      =20
>http://tools.ietf.org/html/draft-kumar-sfc-sfp-optimization-01
>Diff:          =20
>http://www.ietf.org/rfcdiff?url2=3Ddraft-kumar-sfc-sfp-optimization-01
>
>Abstract:
>   Service Function Chaining (SFC) enables services to be delivered by
>   selective traffic steering through an ordered set of service
>   functions.  Once classified into an SFC, the traffic for a given flow
>   is steered through all the service functions of the SFC for the life
>   of the traffic flow even though this is often not necessary.
>   Steering traffic to service functions only while required and not
>   otherwise, leads to optimal SFCs with improved latencies, reduced
>   resource consumption and better user experience.
>
>   This document describes the rationale, techniques and necessary
>   protocol extensions to achieve such optimization.
>
>                 =20
>       =20
>
>
>Please note that it may take a couple of minutes from the time of
>submission
>until the htmlized version and diff are available at tools.ietf.org.
>
>The IETF Secretariat
>


From eun.k.paik@gmail.com  Sun Oct 26 06:26:24 2014
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Subject: Re: [sfc] SFC Honolulu meeting agenda
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--001a11c1f6804434bc0506535994
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Dear Chairs,

We would like a 10min slot to present the SFC failover draft (
http://datatracker.ietf.org/doc/draft-kang-sfc-failover
<http://datatracker.ietf.org/doc/draft-kumar-sfc-sfp-optimization>/).

This document presents failover consideration that is proposed to be moved
into the WG document of SFC Architecture.

Best Regards,
Eun Kyoung PAIK

2014-10-06 22:26 GMT+09:00 Jim Guichard (jguichar) <jguichar@cisco.com>:

>  Greetings WG:
>
>  Our meeting at the upcoming Honolulu venue is fast approaching.  As alwa=
ys,
> the goal of the meeting will be to make the best use of limited
> face-to-face time.
>
>  As we build the meeting agenda we welcome requests for agenda time. As
> always, the goal of a meeting slot is to best further the work of the WG,
> and that generally means focussing on key charter deliverables and topics
> with important open issues to resolve. In the case of individual IDs, the
> goal isn=E2=80=99t necessarily to present what is in the draft but rather=
 to help
> the WG decide what to do with the ID. With that in mind, when making an
> agenda request please consider what you think the WG should do with its
> content. For example:
>
>    - Does the document have useful content that should be moved into
>    another WG document or progress on it=E2=80=99s own merit
>    - Does the content have a good basis for one of the WG documents per
>    the charter (in order for that to happen the document needs to be the =
most
>    appropriate out of the collection of related documents)
>    - Should the document content be merged with one or more other
>    documents, so that a combined document could become a WG document
>
> Jim & Thomas
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
>
>

--001a11c1f6804434bc0506535994
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<div dir=3D"ltr"><div><div>Dear Chairs,</div><div><br></div><div>We would l=
ike a 10min slot to present the <span>SFC</span> failover draft (<a href=3D=
"http://datatracker.ietf.org/doc/draft-kumar-sfc-sfp-optimization" target=
=3D"_blank">http://datatracker.ietf.org/doc/draft-kang-<span>sfc</span>-fai=
lover</a><font color=3D"#000000">/).</font></div></div><div><br></div><div>=
This=C2=A0document=C2=A0presents failover consideration that=C2=A0is propos=
ed to be moved into=C2=A0the WG document of SFC Architecture.</div><div><br=
></div><div>Best Regards,</div><div>Eun Kyoung PAIK</div></div><div class=
=3D"gmail_extra"><br><div class=3D"gmail_quote">2014-10-06 22:26 GMT+09:00 =
Jim Guichard (jguichar) <span dir=3D"ltr">&lt;<a href=3D"mailto:jguichar@ci=
sco.com" target=3D"_blank">jguichar@cisco.com</a>&gt;</span>:<br><blockquot=
e class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc sol=
id;padding-left:1ex">



<div style=3D"color:rgb(0,0,0);font-family:Calibri,sans-serif;font-size:14p=
x">
<div>
<div>Greetings WG:</div>
<div><br>
</div>
<div>Our meeting at the upcoming Honolulu venue is fast approaching. =C2=A0=
<span style=3D"font-size:medium">As=C2=A0</span><span style=3D"font-size:me=
dium">always, the goal of the meeting will be to make the best use of=C2=A0=
</span><span style=3D"font-size:medium">limited
 face-to-face time.</span></div>
<div style=3D"font-family:Calibri">
<div style=3D"font-size:medium"><br>
</div>
<div style=3D"font-size:medium">As we build the meeting agenda we welcome r=
equests for agenda time. As always, the goal of a meeting slot is to best f=
urther the work of the WG, and that generally means focussing on key charte=
r deliverables and topics with important
 open issues to resolve. In the case of individual IDs, the goal isn=E2=80=
=99t necessarily to present what is in the draft but rather to help the WG =
decide what to do with the ID. With that in mind, when making an agenda req=
uest please consider what you think the WG
 should do with its content. For example:</div>
<ul>
<li>Does the document have useful content that should be moved into another=
 WG document or progress on it=E2=80=99s own merit</li><li>Does the content=
 have a good basis for one of the WG documents per the charter (in order fo=
r that to happen the document needs to be the most appropriate out of the c=
ollection of related documents)</li><li>Should the document content be merg=
ed with one or more other documents, so that a combined document could beco=
me a WG document</li></ul>
<div style=3D"font-size:medium">Jim &amp; Thomas</div>
</div>
</div>
</div>

<br>_______________________________________________<br>
sfc mailing list<br>
<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/sfc" target=3D"_blank">htt=
ps://www.ietf.org/mailman/listinfo/sfc</a><br>
<br></blockquote></div><br></div>

--001a11c1f6804434bc0506535994--


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To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, narten@us.ibm.com
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From: wang.cui1@zte.com.cn
Date: Mon, 27 Oct 2014 19:02:04 +0800
X-MIMETrack: Serialize by Router on notes_smtp/zte_ltd(Release 8.5.3FP6|November 21, 2013) at 2014-10-27 19:01:51, Serialize complete at 2014-10-27 19:01:51
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Subject: Re: [sfc] SFC Honolulu meeting agenda
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From nobody Mon Oct 27 05:11:30 2014
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From: Shunsuke Homma <homma.shunsuke@lab.ntt.co.jp>
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Hi all,

I have posted a new draft about analyzing forwarding methods for Service
Chaining.

The purpose of this draft is to clarify the applicable forwarding method 
based on network/service requirements. Currently, several SDOs and WGs 
are considering the use cases of Service Chaining with alternatives 
(e.g. OpenFlow, Segment Routing, and so on), and we should clarify the 
advantages of SFC with SFC encap (e.g. NSH or SCH) compared with the 
other approaches.

I would like to discuss this topic, and also welcome any other point of 
view about the analysis. If you have any comments or questions, please 
let me know.

Best regards,

Shunsuke

-------- Original Message --------
Subject: New Version Notification for 
draft-homma-sfc-forwarding-methods-analysis-00.txt
Date: Mon, 27 Oct 2014 02:44:27 -0700
From: internet-drafts@ietf.org
To: Kengo <naito.kengo@lab.ntt.co.jp>,        Shunsuke Homma 
<homma.shunsuke@lab.ntt.co.jp>,        Diego R. Lopez 
<diego.r.lopez@telefonica.com>,        Diego Lopez 
<diego.r.lopez@telefonica.com>,        Kengo Naito 
<naito.kengo@lab.ntt.co.jp>,        Shunsuke Homma 
<homma.shunsuke@lab.ntt.co.jp>


A new version of I-D, draft-homma-sfc-forwarding-methods-analysis-00.txt
has been successfully submitted by Shunsuke Homma and posted to the
IETF repository.

Name:		draft-homma-sfc-forwarding-methods-analysis
Revision:	00
Title:		Analysis on Forwarding Methods for Service Chaining
Document date:	2014-10-27
Group:		Individual Submission
Pages:		20
URL: 
http://www.ietf.org/internet-drafts/draft-homma-sfc-forwarding-methods-analysis-00.txt
Status: 
https://datatracker.ietf.org/doc/draft-homma-sfc-forwarding-methods-analysis/
Htmlized: 
http://tools.ietf.org/html/draft-homma-sfc-forwarding-methods-analysis-00


Abstract:
    Some working groups of the IETF and other Standards Developing
    Organizations are now discussing use cases of a technology that
    enables data packets to traverse appropriate service functions
    through networks.  This is called Service Chaining in this document.
    (Also, in Network Functions Virtualisation (NFV), a subject that
    forwarding packets to required service functions in appropriate order
    is called VNF Forwarding Graph.)  This draft does not focus only on
    SFC method, and thus, use the term "Service Chaining".  SFC may be
    one method to realize Service Chaining.  There are several Service
    Chaining methods to forward data packets to service functions, and
    the applicable methods will vary depending on the service/network
    requirements of individual networks.

    This document presents the results of analyzing packet forwarding
    methods and path decision patterns for achieving Service Chaining.
    For forwarding data packets to the appropriate service functions,
    distribution of route infromation and steering data packets following
    the route infromation, are required.  Examples of route information
    are packet identifier and the routing configurations based on the
    identifier.  Also, forwarding functions are required to decide the
    path according to the route information.

 



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

The IETF Secretariat





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--_000_D073DC0C3B468jguicharciscocom_
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Dear WG:

This note begins a 2-week WG last call on draft-ietf-sfc-architecture-02 (h=
ttp://datatracker.ietf.org/doc/draft-ietf-sfc-architecture/).

The editors of the architecture document have indicated that they have addr=
essed all known comments and that there are no open issues with the current=
 version of the document.

Substantive comments to the list please, editorial comments can go directly=
 to the document editors.

Special thanks go to Carlos and Joel for their efforts in collecting and ad=
dressing all of the comments for this document.

Jim & Thomas



--_000_D073DC0C3B468jguicharciscocom_
Content-Type: text/html; charset="us-ascii"
Content-ID: <303F6EDCB977804B8108395B89B85423@emea.cisco.com>
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
</head>
<body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-lin=
e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami=
ly: Calibri, sans-serif;">
<div>Dear WG:</div>
<div><br>
</div>
<div>This note begins a 2-week WG last call on draft-ietf-sfc-architecture-=
02 (<a href=3D"http://datatracker.ietf.org/doc/draft-ietf-sfc-architecture/=
">http://datatracker.ietf.org/doc/draft-ietf-sfc-architecture/</a>).&nbsp;<=
/div>
<div><br>
</div>
<div>The editors of the architecture document have indicated that they have=
 addressed all known comments and that there are no open issues with the cu=
rrent version of the document.&nbsp;</div>
<div><br>
</div>
<div>Substantive comments to the list please, editorial comments can go dir=
ectly to the document editors.&nbsp;</div>
<div><br>
</div>
<div>Special thanks go to Carlos and Joel for their efforts in collecting a=
nd addressing all of the comments for this document.</div>
<div><br>
</div>
<div>Jim &amp; Thomas</div>
<div><br>
</div>
<div>
<div style=3D"font-family: Consolas; font-size: medium;"><br>
</div>
</div>
</body>
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--_000_D073DC0C3B468jguicharciscocom_--


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From nobody Mon Oct 27 09:28:32 2014
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From: Linda Dunbar <linda.dunbar@huawei.com>
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Subject: Re: [sfc] SFC Honolulu meeting agenda
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Jim and Thomas,

We have a draft to dive in more details to  the "Rendered Service Path" int=
roduced by draft-ietf-sfc-architecture:  http://www.ietf.org/internet-draft=
s/draft-dunbar-sfc-path-control-00.txt



The draft proposes a framework to represent RSP and its restoration scheme =
when some functions on a RSP fails (or to be replaced by new ones).



We are not sure if the WG F2F time has time to discuss RSP and its restorat=
ion. If it does, we can give a short presentation. If it doesn't, we can di=
scuss offline with interested parties and bring back at next F2F session.



Thanks,

Linda

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Jim Guichard (jguichar=
)
Sent: Monday, October 06, 2014 8:27 AM
To: sfc@ietf.org
Subject: [sfc] SFC Honolulu meeting agenda

Greetings WG:

Our meeting at the upcoming Honolulu venue is fast approaching.  As always,=
 the goal of the meeting will be to make the best use of limited face-to-fa=
ce time.

As we build the meeting agenda we welcome requests for agenda time. As alwa=
ys, the goal of a meeting slot is to best further the work of the WG, and t=
hat generally means focussing on key charter deliverables and topics with i=
mportant open issues to resolve. In the case of individual IDs, the goal is=
n't necessarily to present what is in the draft but rather to help the WG d=
ecide what to do with the ID. With that in mind, when making an agenda requ=
est please consider what you think the WG should do with its content. For e=
xample:

  *   Does the document have useful content that should be moved into anoth=
er WG document or progress on it's own merit
  *   Does the content have a good basis for one of the WG documents per th=
e charter (in order for that to happen the document needs to be the most ap=
propriate out of the collection of related documents)
  *   Should the document content be merged with one or more other document=
s, so that a combined document could become a WG document
Jim & Thomas

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<p class=3D"MsoPlainText">Jim and Thomas, <o:p></o:p></p>
<p class=3D"MsoPlainText">We have a draft to dive in more details to&nbsp; =
the &#8220;Rendered Service Path&#8221; introduced by draft-ietf-sfc-archit=
ecture: &nbsp;<a href=3D"http://www.ietf.org/internet-drafts/draft-dunbar-s=
fc-path-control-00.txt">http://www.ietf.org/internet-drafts/draft-dunbar-sf=
c-path-control-00.txt</a><o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">The draft proposes a framework to represent RSP a=
nd its restoration scheme when some functions on a RSP fails (or to be repl=
aced by new ones).
<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"><o:p>&nbsp;</o:p></span><=
/p>
<p class=3D"MsoPlainText">We are not sure if the WG F2F time has time to di=
scuss RSP and its restoration. If it does, we can give a short presentation=
. If it doesn&#8217;t, we can discuss offline with interested parties and b=
ring back at next F2F session.
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Thanks, <o:p></o:p></p>
<p class=3D"MsoPlainText">Linda<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><=
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<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
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<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;"> sfc [mai=
lto:sfc-bounces@ietf.org]
<b>On Behalf Of </b>Jim Guichard (jguichar)<br>
<b>Sent:</b> Monday, October 06, 2014 8:27 AM<br>
<b>To:</b> sfc@ietf.org<br>
<b>Subject:</b> [sfc] SFC Honolulu meeting agenda<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:7.0pt;font-family:&quot;Cal=
ibri&quot;,&quot;sans-serif&quot;;color:black">Greetings WG:<o:p></o:p></sp=
an></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:7.0pt;font-family:&quot;Cal=
ibri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
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<div>
<p class=3D"MsoNormal"><span style=3D"font-size:7.0pt;font-family:&quot;Cal=
ibri&quot;,&quot;sans-serif&quot;;color:black">Our meeting at the upcoming =
Honolulu venue is fast approaching. &nbsp;</span><span style=3D"font-size:1=
3.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">A=
s&nbsp;always,
 the goal of the meeting will be to make the best use of&nbsp;limited face-=
to-face time.</span><span style=3D"font-size:7.0pt;font-family:&quot;Calibr=
i&quot;,&quot;sans-serif&quot;;color:black"><o:p></o:p></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:13.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p=
>
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<div>
<p class=3D"MsoNormal"><span style=3D"font-size:13.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">As we build the meeting age=
nda we welcome requests for agenda time. As always, the goal of a meeting s=
lot is to best further the work of the WG, and that generally
 means focussing on key charter deliverables and topics with important open=
 issues to resolve. In the case of individual IDs, the goal isn&#8217;t nec=
essarily to present what is in the draft but rather to help the WG decide w=
hat to do with the ID. With that in mind,
 when making an agenda request please consider what you think the WG should=
 do with its content. For example:<o:p></o:p></span></p>
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<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
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<span style=3D"font-size:7.0pt;font-family:&quot;Calibri&quot;,&quot;sans-s=
erif&quot;">Does the document have useful content that should be moved into=
 another WG document or progress on it&#8217;s own merit<o:p></o:p></span><=
/li><li class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;ms=
o-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style=3D"font-size:7.0pt;font-family:&quot;Calibri&quot;,&quot;sans-s=
erif&quot;">Does the content have a good basis for one of the WG documents =
per the charter (in order for that to happen the document needs to be the m=
ost appropriate out of the collection of related documents)<o:p></o:p></spa=
n></li><li class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto=
;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style=3D"font-size:7.0pt;font-family:&quot;Calibri&quot;,&quot;sans-s=
erif&quot;">Should the document content be merged with one or more other do=
cuments, so that a combined document could become a WG document<o:p></o:p><=
/span></li></ul>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:13.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">Jim &amp; Thomas<o:p></o:p>=
</span></p>
</div>
</div>
</div>
</div>
</body>
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<div class=3D"WordSection1">
<p class=3D"MsoNormal" style=3D"word-break:break-hangul"><span lang=3D"EN-U=
S" style=3D"font-size:10.0pt;font-family:&quot;=B8=BC=C0=BA =B0=ED=B5=F1&qu=
ot;;color:#1F497D">Jim,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"word-break:break-hangul"><span lang=3D"EN-U=
S" style=3D"font-size:10.0pt;font-family:&quot;=B8=BC=C0=BA =B0=ED=B5=F1&qu=
ot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-family:&quot;=
=B8=BC=C0=BA =B0=ED=B5=F1&quot;;color:#1F497D">We would like to have a 5-10=
min slot for presenting the draft for SFP control:
</span><span lang=3D"EN-US"><a href=3D"http://www.ietf.org/internet-drafts/=
draft-lee-sfc-dynamic-instantiation-01.txt">http://www.ietf.org/internet-dr=
afts/draft-lee-sfc-dynamic-instantiation-01.txt</a>.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"word-break:break-hangul"><span lang=3D"EN-U=
S" style=3D"font-size:10.0pt;font-family:&quot;=B8=BC=C0=BA =B0=ED=B5=F1&qu=
ot;;color:#1F497D">This draft is for control plane requirements and archite=
cture and we hope to add this issue to the requirement and architecture
 documents.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"word-break:break-hangul"><span lang=3D"EN-U=
S" style=3D"font-size:10.0pt;font-family:&quot;=B8=BC=C0=BA =B0=ED=B5=F1&qu=
ot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"word-break:break-hangul"><span lang=3D"EN-U=
S" style=3D"font-size:10.0pt;font-family:&quot;=B8=BC=C0=BA =B0=ED=B5=F1&qu=
ot;;color:#1F497D">We also hope to see more ideas regarding SFC control pla=
ne at this meeting.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"word-break:break-hangul"><span lang=3D"EN-U=
S" style=3D"font-size:10.0pt;font-family:&quot;=B8=BC=C0=BA =B0=ED=B5=F1&qu=
ot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"word-break:break-hangul"><span lang=3D"EN-U=
S" style=3D"font-size:10.0pt;font-family:&quot;=B8=BC=C0=BA =B0=ED=B5=F1&qu=
ot;;color:#1F497D">Seung-Ik.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"word-break:break-hangul"><span lang=3D"EN-U=
S" style=3D"font-size:10.0pt;font-family:&quot;=B8=BC=C0=BA =B0=ED=B5=F1&qu=
ot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span =
lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&qu=
ot;sans-serif&quot;"> sfc [mailto:sfc-bounces@ietf.org]
<b>On Behalf Of </b>Jim Guichard (jguichar)<br>
<b>Sent:</b> Monday, October 06, 2014 10:27 PM<br>
<b>To:</b> sfc@ietf.org<br>
<b>Subject:</b> [sfc] SFC Honolulu meeting agenda<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Greetings WG=
:<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;<=
/o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Our meeting =
at the upcoming Honolulu venue is fast approaching. &nbsp;</span><span lang=
=3D"EN-US" style=3D"font-size:13.5pt;font-family:&quot;Calibri&quot;,&quot;=
sans-serif&quot;;color:black">As&nbsp;always,
 the goal of the meeting will be to make the best use of&nbsp;limited face-=
to-face time.</span><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-fam=
ily:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black"><o:p></o:p></sp=
an></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;<=
/o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">As we build =
the meeting agenda we welcome requests for agenda time. As always, the goal=
 of a meeting slot is to best further the work of the WG,
 and that generally means focussing on key charter deliverables and topics =
with important open issues to resolve. In the case of individual IDs, the g=
oal isn=A1=AFt necessarily to present what is in the draft but rather to he=
lp the WG decide what to do with the
 ID. With that in mind, when making an agenda request please consider what =
you think the WG should do with its content. For example:<o:p></o:p></span>=
</p>
</div>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Does the document have useful content that shou=
ld be moved into another WG document or progress on it=A1=AFs own merit<o:p=
></o:p></span></li><li class=3D"MsoNormal" style=3D"color:black;mso-margin-=
top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Does the content have a good basis for one of t=
he WG documents per the charter (in order for that to happen the document n=
eeds to be the most appropriate out of the collection of
 related documents)<o:p></o:p></span></li><li class=3D"MsoNormal" style=3D"=
color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 =
level1 lfo1">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Should the document content be merged with one =
or more other documents, so that a combined document could become a WG docu=
ment<o:p></o:p></span></li></ul>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Jim &amp; Th=
omas<o:p></o:p></span></p>
</div>
</div>
</div>
</div>
</div>
</body>
</html>

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From nobody Thu Oct 30 03:15:48 2014
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From: Xuxiaohu <xuxiaohu@huawei.com>
To: "sfc@ietf.org" <sfc@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>, "<spring@ietf.org>" <spring@ietf.org>
Thread-Topic: About the possibility of using MPLS source routing (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda
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Date: Thu, 30 Oct 2014 10:15:29 +0000
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Subject: [sfc] About the possibility of using MPLS source routing (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda
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Hi all,



There are many drafts which mentioned the possibility of using the MPLS sou=
rce routing (i.e., MPLS-SPRING) mechanism for service function chain purpos=
e. However, we do need a detailed evaluation of such possibility so as to f=
igure out whether any potential extensions to the MPLS architecture is requ=
ired. For instance,



1) although an MPLS label stack could be used to indicate an SFP, however, =
when an SFF-proxy receives such a MPLS packet, it must know the payload typ=
e of the MPLS packet before sending the original packet to the correspondin=
g legacy SF. How? In fact, even in the non-legacy SF case, should the SFF d=
irectly forward the MPLS packet to the corresponding SF directly or strip t=
he MPLS header before sending the packet to the corresponding SF? In the fo=
rmer case, the corresponding SF should know the payload type of the MPLS pa=
cket. In the latter case, the SFF should know the payload type. To identify=
 the payload type, one way is to allocate a separate local label for each p=
ayload type (is this a scalable way?), another way is to allocate an SPL or=
 an ESPL for each payload type (is this the normal purpose of the SPL or ES=
PL), a third way is to introduce a SPL or ESPL which is followed by a proto=
col id header (is this a significant change to the MPLS architecture?).



2) assume an SFF needs to strip the "whole" MPLS header before sending the =
packet to the corresponding SF, does it mean a big change to the current MP=
LS forwarding plane?



3) when using an MPLS label stack to indicate an SFC rather than an SFP, ea=
ch SF would have to be identified by a domain-wide label. One way is to res=
erve the same label range for SF SID purpose by all the SFFs. Another way i=
s to rely on the context label concept (i.e., each SF of an SFC would have =
to be represented by two labels in the label stack, one is the context indi=
cation label, the other is the label allocated from that context label spac=
e for that SF ). However, it seems that the domain-wide label usage is stil=
l a controversial topic in the IETF community.



4) how to convey metadata in an MPLS packet? This issue may be the same as =
issue 1.



Any comments?



Best regards,

Xiaohu


From: Jim Guichard (jguichar) [mailto:jguichar@cisco.com]
Sent: Wednesday, October 29, 2014 8:15 PM
To: Xuxiaohu; Thomas Narten
Subject: Re: SFC Honolulu meeting agenda

Hi Xiaohu,

Our agenda is not yet finalized but we will only be allowing slots for draf=
ts that have had mailing list discussion and are directly related to our im=
mediate deliverables. For this reason we are unable to allocate time for di=
scussion of your draft in HI.  Please feel free to continue to solicit disc=
ussion on the SFC mailing list.

Jim & Thomas

From: Xuxiaohu <xuxiaohu@huawei.com<mailto:xuxiaohu@huawei.com>>
Date: Tuesday, October 28, 2014 at 11:30 PM
To: Jim Guichard <jguichar@cisco.com<mailto:jguichar@cisco.com>>, Thomas Na=
rten <narten@us.ibm.com<mailto:narten@us.ibm.com>>
Subject: RE: SFC Honolulu meeting agenda

Hi co-chairs,

I found there are still available time on the SFC agenda. Hence I wonder wh=
ether you could allocate a 15-min slot for presenting this draft.

Best regards,
Xiaohu

From: Xuxiaohu
Sent: Wednesday, October 08, 2014 4:50 PM
To: 'Jim Guichard (jguichar)'; sfc@ietf.org<mailto:sfc@ietf.org>
Subject: RE: SFC Honolulu meeting agenda

Hi co-chairs,

I would like to request a 15-min slot for presenting the following draft (h=
ttps://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-00). Since "Gener=
ic SFC Encapsulation" is one of the WG charter deliverables and the charter=
 states that "...The working group will consider using an existing encapsul=
ation (with extensions as appropriate) if a suitable candidate is found..."=
 I would like the WG to help evaluating whether the MPLS-SPRING-based SFC e=
ncapsulation approach as described in the above draft could be considered a=
s one of the candidates.

Best regards,
Xiaohu

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Jim Guichard (jguichar=
)
Sent: Monday, October 06, 2014 9:27 PM
To: sfc@ietf.org<mailto:sfc@ietf.org>
Subject: [sfc] SFC Honolulu meeting agenda

Greetings WG:

Our meeting at the upcoming Honolulu venue is fast approaching.  As always,=
 the goal of the meeting will be to make the best use of limited face-to-fa=
ce time.

As we build the meeting agenda we welcome requests for agenda time. As alwa=
ys, the goal of a meeting slot is to best further the work of the WG, and t=
hat generally means focussing on key charter deliverables and topics with i=
mportant open issues to resolve. In the case of individual IDs, the goal is=
n't necessarily to present what is in the draft but rather to help the WG d=
ecide what to do with the ID. With that in mind, when making an agenda requ=
est please consider what you think the WG should do with its content. For e=
xample:

  *   Does the document have useful content that should be moved into anoth=
er WG document or progress on it's own merit
  *   Does the content have a good basis for one of the WG documents per th=
e charter (in order for that to happen the document needs to be the most ap=
propriate out of the collection of related documents)
  *   Should the document content be merged with one or more other document=
s, so that a combined document could become a WG document
Jim & Thomas

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<body lang=3D"ZH-CN" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Hi all,<o:p></o:p></span></p=
>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">There are many drafts which =
mentioned the possibility of using the MPLS source routing (i.e., MPLS-SPRI=
NG) mechanism for service function chain purpose. However, we do need a det=
ailed evaluation of such possibility
 so as to figure out whether any potential extensions to the MPLS architect=
ure is required. For instance,
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">1) although an MPLS label st=
ack could be used to indicate an SFP, however, when an SFF-proxy receives s=
uch a MPLS packet, it must know the payload type of the MPLS packet before =
sending the original packet to the corresponding
 legacy SF. How? In fact, even in the non-legacy SF case, should the SFF di=
rectly forward the MPLS packet to the corresponding SF directly or strip th=
e MPLS header before sending the packet to the corresponding SF? In the for=
mer case, the corresponding SF should
 know the payload type of the MPLS packet. In the latter case, the SFF shou=
ld know the payload type. To identify the payload type, one way is to alloc=
ate a separate local label for each payload type (is this a scalable way?),=
 another way is to allocate an SPL
 or an ESPL for each payload type (is this the normal purpose of the SPL or=
 ESPL), a third way is to introduce a SPL or ESPL which is followed by a pr=
otocol id header (is this a significant change to the MPLS architecture?).<=
o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">2) assume an SFF needs to st=
rip the </span>
<span lang=3D"EN-US" style=3D"font-family:&quot;Courier New&quot;">&#8220;<=
/span><span lang=3D"EN-US">whole</span><span lang=3D"EN-US" style=3D"font-f=
amily:&quot;Courier New&quot;">&#8221;</span><span lang=3D"EN-US"> MPLS hea=
der before sending the packet to the corresponding SF, does it mean a big c=
hange
 to the current MPLS forwarding plane?<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">3) when using an MPLS label =
stack to indicate an SFC rather than an SFP, each SF would have to be ident=
ified by a domain-wide label. One way is to reserve the same label range fo=
r SF SID purpose by all the SFFs. Another
 way is to rely on the context label concept (i.e., each SF of an SFC would=
 have to be represented by two labels in the label stack, one is the contex=
t indication label, the other is the label allocated from that context labe=
l space for that SF ). However,
 it seems that the domain-wide label usage is still a controversial topic i=
n the IETF community.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">4) how to convey metadata in=
 an MPLS packet? This issue may be the same as issue 1.<o:p></o:p></span></=
p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Any comments?<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Best regards,<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Xiaohu<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span =
lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&qu=
ot;sans-serif&quot;"> Jim Guichard (jguichar) [mailto:jguichar@cisco.com]
<br>
<b>Sent:</b> Wednesday, October 29, 2014 8:15 PM<br>
<b>To:</b> Xuxiaohu; Thomas Narten<br>
<b>Subject:</b> Re: SFC Honolulu meeting agenda<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Hi Xiaohu,<o=
:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;<=
/o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Our agenda i=
s not yet finalized but we will only be allowing slots for drafts that have=
 had mailing list discussion and are directly related to our
 immediate deliverables. For this reason we are unable to allocate time for=
 discussion of your draft in HI. &nbsp;Please feel free to continue to soli=
cit discussion on the SFC mailing list.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;<=
/o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Jim &amp; Th=
omas<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;<=
/o:p></span></p>
</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">From:
</span></b><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:black">Xuxiaohu &lt;<a href=3D"=
mailto:xuxiaohu@huawei.com">xuxiaohu@huawei.com</a>&gt;<br>
<b>Date: </b>Tuesday, October 28, 2014 at 11:30 PM<br>
<b>To: </b>Jim Guichard &lt;<a href=3D"mailto:jguichar@cisco.com">jguichar@=
cisco.com</a>&gt;, Thomas Narten &lt;<a href=3D"mailto:narten@us.ibm.com">n=
arten@us.ibm.com</a>&gt;<br>
<b>Subject: </b>RE: SFC Honolulu meeting agenda<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;<=
/o:p></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi co-chai=
rs,</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">I found th=
ere are still available time on the SFC agenda. Hence I wonder whether you =
could allocate a 15-min slot for presenting this draft.</span><span lang=3D=
"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Best regar=
ds,</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Xiaohu</sp=
an><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:black">From:</spa=
n></b><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Taho=
ma&quot;,&quot;sans-serif&quot;;color:black"> Xuxiaohu
<br>
<b>Sent:</b> Wednesday, October 08, 2014 4:50 PM<br>
<b>To:</b> 'Jim Guichard (jguichar)'; <a href=3D"mailto:sfc@ietf.org">sfc@i=
etf.org</a><br>
<b>Subject:</b> RE: SFC Honolulu meeting agenda</span><span lang=3D"EN-US" =
style=3D"color:black"><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi co-chai=
rs,</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">I would li=
ke to request a 15-min slot for presenting the following draft (<a href=3D"=
https://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-00"><span style=
=3D"color:#1F497D;text-decoration:none">https://tools.ietf.org/html/draft-x=
u-sfc-using-mpls-spring-00</span></a>).
 Since &#8220;Generic SFC Encapsulation&#8221; is one of the WG charter del=
iverables and the charter states that &#8220;&#8230;The working group will =
consider using an existing encapsulation (with extensions as appropriate) i=
f a suitable candidate is found...&#8221; I would like the WG
 to help evaluating whether the MPLS-SPRING-based SFC encapsulation approac=
h as described in the above draft could be considered as one of the candida=
tes.</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Best regar=
ds,</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Xiaohu</sp=
an><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:black">From:</spa=
n></b><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Taho=
ma&quot;,&quot;sans-serif&quot;;color:black"> sfc [<a href=3D"mailto:sfc-bo=
unces@ietf.org">mailto:sfc-bounces@ietf.org</a>]
<b>On Behalf Of </b>Jim Guichard (jguichar)<br>
<b>Sent:</b> Monday, October 06, 2014 9:27 PM<br>
<b>To:</b> <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<b>Subject:</b> [sfc] SFC Honolulu meeting agenda</span><span lang=3D"EN-US=
" style=3D"color:black"><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:black">&nbsp;<o:=
p></o:p></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Greetings WG=
:</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">&nbsp;</span=
><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Our meeting =
at the upcoming Honolulu venue is fast approaching. &nbsp;</span><span lang=
=3D"EN-US" style=3D"font-size:13.5pt;font-family:&quot;Calibri&quot;,&quot;=
sans-serif&quot;;color:black">As&nbsp;always,
 the goal of the meeting will be to make the best use of&nbsp;limited face-=
to-face time.</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p><=
/span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">&nbsp;</span=
><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">As we build =
the meeting agenda we welcome requests for agenda time. As always, the goal=
 of a meeting slot is to best further the work of the WG,
 and that generally means focussing on key charter deliverables and topics =
with important open issues to resolve. In the case of individual IDs, the g=
oal isn&#8217;t necessarily to present what is in the draft but rather to h=
elp the WG decide what to do with the
 ID. With that in mind, when making an agenda request please consider what =
you think the WG should do with its content. For example:</span><span lang=
=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p>
</div>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l0 level1 lfo3">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Does the document have useful content that shou=
ld be moved into another WG document or progress on it&#8217;s own merit</s=
pan><span lang=3D"EN-US"><o:p></o:p></span></li><li class=3D"MsoNormal" sty=
le=3D"color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-li=
st:l0 level1 lfo3">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Does the content have a good basis for one of t=
he WG documents per the charter (in order for that to happen the document n=
eeds to be the most appropriate out of the collection of
 related documents)</span><span lang=3D"EN-US"><o:p></o:p></span></li><li c=
lass=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto;mso-list:l0 level1 lfo3">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Should the document content be merged with one =
or more other documents, so that a combined document could become a WG docu=
ment</span><span lang=3D"EN-US"><o:p></o:p></span></li></ul>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Jim &amp; Th=
omas</span><span lang=3D"EN-US" style=3D"color:black"><o:p></o:p></span></p=
>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>

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Thread-Topic: [sfc] Fw: New Version Notification for draft-mackie-sfc-using-virtual-networking-02.txt
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From: Xuxiaohu <xuxiaohu@huawei.com>
To: Ron Parker <Ron_Parker@affirmednetworks.com>
Thread-Topic: [sfc] About the possibility of using MPLS source routing (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda
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Date: Fri, 31 Oct 2014 02:28:04 +0000
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Subject: Re: [sfc] About the possibility of using MPLS source routing (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda
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Hi Ron,

Did you mean an SPL(Special Purpose Label) or an ESPL(Extended Special Purp=
ose Label) by a well-known global label? If so, additional SPLs or ESPLs wo=
uld need to be allocated for different MPLS payload, such as Ethernet frame=
 and IP packet. However I wonder whether it is the normal usage of the SPL =
and ESPL space (i.e., used as a protocol type identifier)?

Best regards,
Xiaohu

From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
Sent: Friday, October 31, 2014 4:45 AM
To: Xuxiaohu
Cc: sfc@ietf.org; mpls@ietf.org; <spring@ietf.org>
Subject: Re: [sfc] About the possibility of using MPLS source routing (i.e.=
, MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda

Xiaohu,

Regarding carriage of metadata -- the MPLS would be only the transport part=
.  What about reserving a well known global label that means SCH/NSH header=
 follows.  This well known label would always be at the BOS.

   Ron


On Oct 30, 2014, at 3:15 AM, Xuxiaohu <xuxiaohu@huawei.com<mailto:xuxiaohu@=
huawei.com>> wrote:

Hi all,



There are many drafts which mentioned the possibility of using the MPLS sou=
rce routing (i.e., MPLS-SPRING) mechanism for service function chain purpos=
e. However, we do need a detailed evaluation of such possibility so as to f=
igure out whether any potential extensions to the MPLS architecture is requ=
ired. For instance,



1) although an MPLS label stack could be used to indicate an SFP, however, =
when an SFF-proxy receives such a MPLS packet, it must know the payload typ=
e of the MPLS packet before sending the original packet to the correspondin=
g legacy SF. How? In fact, even in the non-legacy SF case, should the SFF d=
irectly forward the MPLS packet to the corresponding SF directly or strip t=
he MPLS header before sending the packet to the corresponding SF? In the fo=
rmer case, the corresponding SF should know the payload type of the MPLS pa=
cket. In the latter case, the SFF should know the payload type. To identify=
 the payload type, one way is to allocate a separate local label for each p=
ayload type (is this a scalable way?), another way is to allocate an SPL or=
 an ESPL for each payload type (is this the normal purpose of the SPL or ES=
PL), a third way is to introduce a SPL or ESPL which is followed by a proto=
col id header (is this a significant change to the MPLS architecture?).



2) assume an SFF needs to strip the "whole" MPLS header before sending the =
packet to the corresponding SF, does it mean a big change to the current MP=
LS forwarding plane?



3) when using an MPLS label stack to indicate an SFC rather than an SFP, ea=
ch SF would have to be identified by a domain-wide label. One way is to res=
erve the same label range for SF SID purpose by all the SFFs. Another way i=
s to rely on the context label concept (i.e., each SF of an SFC would have =
to be represented by two labels in the label stack, one is the context indi=
cation label, the other is the label allocated from that context label spac=
e for that SF ). However, it seems that the domain-wide label usage is stil=
l a controversial topic in the IETF community.



4) how to convey metadata in an MPLS packet? This issue may be the same as =
issue 1.



Any comments?



Best regards,

Xiaohu


From: Jim Guichard (jguichar) [mailto:jguichar@cisco.com]
Sent: Wednesday, October 29, 2014 8:15 PM
To: Xuxiaohu; Thomas Narten
Subject: Re: SFC Honolulu meeting agenda

Hi Xiaohu,

Our agenda is not yet finalized but we will only be allowing slots for draf=
ts that have had mailing list discussion and are directly related to our im=
mediate deliverables. For this reason we are unable to allocate time for di=
scussion of your draft in HI.  Please feel free to continue to solicit disc=
ussion on the SFC mailing list.

Jim & Thomas

From: Xuxiaohu <xuxiaohu@huawei.com<mailto:xuxiaohu@huawei.com>>
Date: Tuesday, October 28, 2014 at 11:30 PM
To: Jim Guichard <jguichar@cisco.com<mailto:jguichar@cisco.com>>, Thomas Na=
rten <narten@us.ibm.com<mailto:narten@us.ibm.com>>
Subject: RE: SFC Honolulu meeting agenda

Hi co-chairs,

I found there are still available time on the SFC agenda. Hence I wonder wh=
ether you could allocate a 15-min slot for presenting this draft.

Best regards,
Xiaohu

From: Xuxiaohu
Sent: Wednesday, October 08, 2014 4:50 PM
To: 'Jim Guichard (jguichar)'; sfc@ietf.org<mailto:sfc@ietf.org>
Subject: RE: SFC Honolulu meeting agenda

Hi co-chairs,

I would like to request a 15-min slot for presenting the following draft (h=
ttps://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-00). Since "Gener=
ic SFC Encapsulation" is one of the WG charter deliverables and the charter=
 states that "...The working group will consider using an existing encapsul=
ation (with extensions as appropriate) if a suitable candidate is found..."=
 I would like the WG to help evaluating whether the MPLS-SPRING-based SFC e=
ncapsulation approach as described in the above draft could be considered a=
s one of the candidates.

Best regards,
Xiaohu

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Jim Guichard (jguichar=
)
Sent: Monday, October 06, 2014 9:27 PM
To: sfc@ietf.org<mailto:sfc@ietf.org>
Subject: [sfc] SFC Honolulu meeting agenda

Greetings WG:

Our meeting at the upcoming Honolulu venue is fast approaching.  As always,=
 the goal of the meeting will be to make the best use of limited face-to-fa=
ce time.

As we build the meeting agenda we welcome requests for agenda time. As alwa=
ys, the goal of a meeting slot is to best further the work of the WG, and t=
hat generally means focussing on key charter deliverables and topics with i=
mportant open issues to resolve. In the case of individual IDs, the goal is=
n't necessarily to present what is in the draft but rather to help the WG d=
ecide what to do with the ID. With that in mind, when making an agenda requ=
est please consider what you think the WG should do with its content. For e=
xample:

  *   Does the document have useful content that should be moved into anoth=
er WG document or progress on it's own merit
  *   Does the content have a good basis for one of the WG documents per th=
e charter (in order for that to happen the document needs to be the most ap=
propriate out of the collection of related documents)
  *   Should the document content be merged with one or more other document=
s, so that a combined document could become a WG document
Jim & Thomas
_______________________________________________
sfc mailing list
sfc@ietf.org<mailto:sfc@ietf.org>
https://www.ietf.org/mailman/listinfo/sfc

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</head>
<body lang=3D"ZH-CN" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi Ron,<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Did you me=
an an SPL(Special Purpose Label) or an ESPL(Extended Special Purpose Label)=
 by a well-known global label? If so, additional SPLs or ESPLs
 would need to be allocated for different MPLS payload, such as Ethernet fr=
ame and IP packet. However I wonder whether it is the normal usage of the S=
PL and ESPL space (i.e., used as a protocol type identifier)?<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Best regar=
ds,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Xiaohu<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span =
lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&qu=
ot;sans-serif&quot;"> Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
<br>
<b>Sent:</b> Friday, October 31, 2014 4:45 AM<br>
<b>To:</b> Xuxiaohu<br>
<b>Cc:</b> sfc@ietf.org; mpls@ietf.org; &lt;spring@ietf.org&gt;<br>
<b>Subject:</b> Re: [sfc] About the possibility of using MPLS source routin=
g (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda<o:=
p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Xiaohu,<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Regarding carriage of metadata =
-- the MPLS would be only the transport part. &nbsp;What about reserving a =
well known global label that means SCH/NSH header follows. &nbsp;This well =
known label would always be at the BOS. &nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp; &nbsp;Ron<o:p></o:p></sp=
an></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span lang=3D"EN-US">=
<br>
On Oct 30, 2014, at 3:15 AM, Xuxiaohu &lt;<a href=3D"mailto:xuxiaohu@huawei=
.com">xuxiaohu@huawei.com</a>&gt; wrote:<o:p></o:p></span></p>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Hi all,<o:p></o:p></span></p=
>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">There are many drafts which =
mentioned the possibility of using the MPLS source routing (i.e., MPLS-SPRI=
NG) mechanism for service function chain purpose. However, we do need a det=
ailed evaluation of such possibility
 so as to figure out whether any potential extensions to the MPLS architect=
ure is required. For instance,
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">1) although an MPLS label st=
ack could be used to indicate an SFP, however, when an SFF-proxy receives s=
uch a MPLS packet, it must know the payload type of the MPLS packet before =
sending the original packet to the corresponding
 legacy SF. How? In fact, even in the non-legacy SF case, should the SFF di=
rectly forward the MPLS packet to the corresponding SF directly or strip th=
e MPLS header before sending the packet to the corresponding SF? In the for=
mer case, the corresponding SF should
 know the payload type of the MPLS packet. In the latter case, the SFF shou=
ld know the payload type. To identify the payload type, one way is to alloc=
ate a separate local label for each payload type (is this a scalable way?),=
 another way is to allocate an SPL
 or an ESPL for each payload type (is this the normal purpose of the SPL or=
 ESPL), a third way is to introduce a SPL or ESPL which is followed by a pr=
otocol id header (is this a significant change to the MPLS architecture?).<=
o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">2) assume an SFF needs to st=
rip the </span>
<span lang=3D"EN-US" style=3D"font-family:&quot;Courier New&quot;">&#8220;<=
/span><span lang=3D"EN-US">whole</span><span lang=3D"EN-US" style=3D"font-f=
amily:&quot;Courier New&quot;">&#8221;</span><span lang=3D"EN-US"> MPLS hea=
der before sending the packet to the corresponding SF, does it mean a big c=
hange
 to the current MPLS forwarding plane?<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">3) when using an MPLS label =
stack to indicate an SFC rather than an SFP, each SF would have to be ident=
ified by a domain-wide label. One way is to reserve the same label range fo=
r SF SID purpose by all the SFFs. Another
 way is to rely on the context label concept (i.e., each SF of an SFC would=
 have to be represented by two labels in the label stack, one is the contex=
t indication label, the other is the label allocated from that context labe=
l space for that SF ). However,
 it seems that the domain-wide label usage is still a controversial topic i=
n the IETF community.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">4) how to convey metadata in=
 an MPLS packet? This issue may be the same as issue 1.<o:p></o:p></span></=
p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Any comments?<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Best regards,<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Xiaohu<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span =
lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&qu=
ot;sans-serif&quot;"> Jim Guichard (jguichar) [<a href=3D"mailto:jguichar@c=
isco.com">mailto:jguichar@cisco.com</a>]
<br>
<b>Sent:</b> Wednesday, October 29, 2014 8:15 PM<br>
<b>To:</b> Xuxiaohu; Thomas Narten<br>
<b>Subject:</b> Re: SFC Honolulu meeting agenda</span><span lang=3D"EN-US">=
<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Hi Xiaohu,</=
span><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">&nbsp;</span=
><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Our agenda i=
s not yet finalized but we will only be allowing slots for drafts that have=
 had mailing list discussion and are directly related to our
 immediate deliverables. For this reason we are unable to allocate time for=
 discussion of your draft in HI. &nbsp;Please feel free to continue to soli=
cit discussion on the SFC mailing list.</span><span lang=3D"EN-US"><o:p></o=
:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">&nbsp;</span=
><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Jim &amp; Th=
omas</span><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">&nbsp;</span=
><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">From:
</span></b><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:black">Xuxiaohu &lt;<a href=3D"=
mailto:xuxiaohu@huawei.com">xuxiaohu@huawei.com</a>&gt;<br>
<b>Date: </b>Tuesday, October 28, 2014 at 11:30 PM<br>
<b>To: </b>Jim Guichard &lt;<a href=3D"mailto:jguichar@cisco.com">jguichar@=
cisco.com</a>&gt;, Thomas Narten &lt;<a href=3D"mailto:narten@us.ibm.com">n=
arten@us.ibm.com</a>&gt;<br>
<b>Subject: </b>RE: SFC Honolulu meeting agenda</span><span lang=3D"EN-US">=
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">&nbsp;</span=
><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi co-chai=
rs,</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">I found th=
ere are still available time on the SFC agenda. Hence I wonder whether you =
could allocate a 15-min slot for presenting this draft.</span><span lang=3D=
"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Best regar=
ds,</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Xiaohu</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:black">From:</spa=
n></b><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Taho=
ma&quot;,&quot;sans-serif&quot;;color:black"> Xuxiaohu
<br>
<b>Sent:</b> Wednesday, October 08, 2014 4:50 PM<br>
<b>To:</b> 'Jim Guichard (jguichar)'; <a href=3D"mailto:sfc@ietf.org">sfc@i=
etf.org</a><br>
<b>Subject:</b> RE: SFC Honolulu meeting agenda</span><span lang=3D"EN-US">=
<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:black">&nbsp;</s=
pan><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi co-chai=
rs,</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">I would li=
ke to request a 15-min slot for presenting the following draft (<a href=3D"=
https://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-00"><span style=
=3D"color:#1F497D;text-decoration:none">https://tools.ietf.org/html/draft-x=
u-sfc-using-mpls-spring-00</span></a>).
 Since &#8220;Generic SFC Encapsulation&#8221; is one of the WG charter del=
iverables and the charter states that &#8220;&#8230;The working group will =
consider using an existing encapsulation (with extensions as appropriate) i=
f a suitable candidate is found...&#8221; I would like the WG
 to help evaluating whether the MPLS-SPRING-based SFC encapsulation approac=
h as described in the above draft could be considered as one of the candida=
tes.</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Best regar=
ds,</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Xiaohu</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:black">From:</spa=
n></b><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Taho=
ma&quot;,&quot;sans-serif&quot;;color:black"> sfc [<a href=3D"mailto:sfc-bo=
unces@ietf.org">mailto:sfc-bounces@ietf.org</a>]
<b>On Behalf Of </b>Jim Guichard (jguichar)<br>
<b>Sent:</b> Monday, October 06, 2014 9:27 PM<br>
<b>To:</b> <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<b>Subject:</b> [sfc] SFC Honolulu meeting agenda</span><span lang=3D"EN-US=
"><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:black">&nbsp;</s=
pan><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Greetings WG=
:</span><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">&nbsp;</span=
><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Our meeting =
at the upcoming Honolulu venue is fast approaching. &nbsp;</span><span lang=
=3D"EN-US" style=3D"font-size:13.5pt;font-family:&quot;Calibri&quot;,&quot;=
sans-serif&quot;;color:black">As&nbsp;always,
 the goal of the meeting will be to make the best use of&nbsp;limited face-=
to-face time.</span><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">&nbsp;</span=
><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">As we build =
the meeting agenda we welcome requests for agenda time. As always, the goal=
 of a meeting slot is to best further the work of the WG,
 and that generally means focussing on key charter deliverables and topics =
with important open issues to resolve. In the case of individual IDs, the g=
oal isn&#8217;t necessarily to present what is in the draft but rather to h=
elp the WG decide what to do with the
 ID. With that in mind, when making an agenda request please consider what =
you think the WG should do with its content. For example:</span><span lang=
=3D"EN-US"><o:p></o:p></span></p>
</div>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l0 level1 lfo3">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Does the document have useful content that shou=
ld be moved into another WG document or progress on it&#8217;s own merit</s=
pan><span lang=3D"EN-US"><o:p></o:p></span></li><li class=3D"MsoNormal" sty=
le=3D"color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-li=
st:l0 level1 lfo3">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Does the content have a good basis for one of t=
he WG documents per the charter (in order for that to happen the document n=
eeds to be the most appropriate out of the collection of
 related documents)</span><span lang=3D"EN-US"><o:p></o:p></span></li><li c=
lass=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto;mso-list:l0 level1 lfo3">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Should the document content be merged with one =
or more other documents, so that a combined document could become a WG docu=
ment</span><span lang=3D"EN-US"><o:p></o:p></span></li></ul>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Jim &amp; Th=
omas</span><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">_______________________________=
________________<br>
sfc mailing list<br>
<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/sfc">https://www.ietf.org/=
mailman/listinfo/sfc</a><o:p></o:p></span></p>
</div>
</blockquote>
</div>
</div>
</body>
</html>

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From: Xuxiaohu <xuxiaohu@huawei.com>
To: Gregory Mirsky <gregory.mirsky@ericsson.com>, Ron Parker <Ron_Parker@affirmednetworks.com>
Thread-Topic: [sfc] About the possibility of using MPLS source routing (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda
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Subject: Re: [sfc] About the possibility of using MPLS source routing (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda
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Hi Greg,

However, RFC5586 explicitly states that "The G-ACh MUST NOT be used to tran=
sport user traffic." Anyway, it seems that we need a way to indentify the p=
ayload type of the MPLS packet (e.g., metadata, Ethernet frame, IP packet) =
in the MPLS-based SFC case.

Best regards
Xiaohu

From: Gregory Mirsky [mailto:gregory.mirsky@ericsson.com]
Sent: Friday, October 31, 2014 2:24 PM
To: Xuxiaohu; Ron Parker
Cc: mpls@ietf.org; <spring@ietf.org>; sfc@ietf.org
Subject: RE: [sfc] About the possibility of using MPLS source routing (i.e.=
, MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda

Hi Xiaohu, Ron, et. al,
what if metadata carried over SF ACH type?

                Regards,
                                Greg

From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Xuxiaohu
Sent: Thursday, October 30, 2014 7:28 PM
To: Ron Parker
Cc: mpls@ietf.org<mailto:mpls@ietf.org>; <spring@ietf.org<mailto:spring@iet=
f.org>>; sfc@ietf.org<mailto:sfc@ietf.org>
Subject: Re: [mpls] [sfc] About the possibility of using MPLS source routin=
g (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda

Hi Ron,

Did you mean an SPL(Special Purpose Label) or an ESPL(Extended Special Purp=
ose Label) by a well-known global label? If so, additional SPLs or ESPLs wo=
uld need to be allocated for different MPLS payload, such as Ethernet frame=
 and IP packet. However I wonder whether it is the normal usage of the SPL =
and ESPL space (i.e., used as a protocol type identifier)?

Best regards,
Xiaohu

From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
Sent: Friday, October 31, 2014 4:45 AM
To: Xuxiaohu
Cc: sfc@ietf.org<mailto:sfc@ietf.org>; mpls@ietf.org<mailto:mpls@ietf.org>;=
 <spring@ietf.org<mailto:spring@ietf.org>>
Subject: Re: [sfc] About the possibility of using MPLS source routing (i.e.=
, MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda

Xiaohu,

Regarding carriage of metadata -- the MPLS would be only the transport part=
.  What about reserving a well known global label that means SCH/NSH header=
 follows.  This well known label would always be at the BOS.

   Ron


On Oct 30, 2014, at 3:15 AM, Xuxiaohu <xuxiaohu@huawei.com<mailto:xuxiaohu@=
huawei.com>> wrote:

Hi all,



There are many drafts which mentioned the possibility of using the MPLS sou=
rce routing (i.e., MPLS-SPRING) mechanism for service function chain purpos=
e. However, we do need a detailed evaluation of such possibility so as to f=
igure out whether any potential extensions to the MPLS architecture is requ=
ired. For instance,



1) although an MPLS label stack could be used to indicate an SFP, however, =
when an SFF-proxy receives such a MPLS packet, it must know the payload typ=
e of the MPLS packet before sending the original packet to the correspondin=
g legacy SF. How? In fact, even in the non-legacy SF case, should the SFF d=
irectly forward the MPLS packet to the corresponding SF directly or strip t=
he MPLS header before sending the packet to the corresponding SF? In the fo=
rmer case, the corresponding SF should know the payload type of the MPLS pa=
cket. In the latter case, the SFF should know the payload type. To identify=
 the payload type, one way is to allocate a separate local label for each p=
ayload type (is this a scalable way?), another way is to allocate an SPL or=
 an ESPL for each payload type (is this the normal purpose of the SPL or ES=
PL), a third way is to introduce a SPL or ESPL which is followed by a proto=
col id header (is this a significant change to the MPLS architecture?).



2) assume an SFF needs to strip the "whole" MPLS header before sending the =
packet to the corresponding SF, does it mean a big change to the current MP=
LS forwarding plane?



3) when using an MPLS label stack to indicate an SFC rather than an SFP, ea=
ch SF would have to be identified by a domain-wide label. One way is to res=
erve the same label range for SF SID purpose by all the SFFs. Another way i=
s to rely on the context label concept (i.e., each SF of an SFC would have =
to be represented by two labels in the label stack, one is the context indi=
cation label, the other is the label allocated from that context label spac=
e for that SF ). However, it seems that the domain-wide label usage is stil=
l a controversial topic in the IETF community.



4) how to convey metadata in an MPLS packet? This issue may be the same as =
issue 1.



Any comments?



Best regards,

Xiaohu


From: Jim Guichard (jguichar) [mailto:jguichar@cisco.com]
Sent: Wednesday, October 29, 2014 8:15 PM
To: Xuxiaohu; Thomas Narten
Subject: Re: SFC Honolulu meeting agenda

Hi Xiaohu,

Our agenda is not yet finalized but we will only be allowing slots for draf=
ts that have had mailing list discussion and are directly related to our im=
mediate deliverables. For this reason we are unable to allocate time for di=
scussion of your draft in HI.  Please feel free to continue to solicit disc=
ussion on the SFC mailing list.

Jim & Thomas

From: Xuxiaohu <xuxiaohu@huawei.com<mailto:xuxiaohu@huawei.com>>
Date: Tuesday, October 28, 2014 at 11:30 PM
To: Jim Guichard <jguichar@cisco.com<mailto:jguichar@cisco.com>>, Thomas Na=
rten <narten@us.ibm.com<mailto:narten@us.ibm.com>>
Subject: RE: SFC Honolulu meeting agenda

Hi co-chairs,

I found there are still available time on the SFC agenda. Hence I wonder wh=
ether you could allocate a 15-min slot for presenting this draft.

Best regards,
Xiaohu

From: Xuxiaohu
Sent: Wednesday, October 08, 2014 4:50 PM
To: 'Jim Guichard (jguichar)'; sfc@ietf.org<mailto:sfc@ietf.org>
Subject: RE: SFC Honolulu meeting agenda

Hi co-chairs,

I would like to request a 15-min slot for presenting the following draft (h=
ttps://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-00). Since "Gener=
ic SFC Encapsulation" is one of the WG charter deliverables and the charter=
 states that "...The working group will consider using an existing encapsul=
ation (with extensions as appropriate) if a suitable candidate is found..."=
 I would like the WG to help evaluating whether the MPLS-SPRING-based SFC e=
ncapsulation approach as described in the above draft could be considered a=
s one of the candidates.

Best regards,
Xiaohu

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Jim Guichard (jguichar=
)
Sent: Monday, October 06, 2014 9:27 PM
To: sfc@ietf.org<mailto:sfc@ietf.org>
Subject: [sfc] SFC Honolulu meeting agenda

Greetings WG:

Our meeting at the upcoming Honolulu venue is fast approaching.  As always,=
 the goal of the meeting will be to make the best use of limited face-to-fa=
ce time.

As we build the meeting agenda we welcome requests for agenda time. As alwa=
ys, the goal of a meeting slot is to best further the work of the WG, and t=
hat generally means focussing on key charter deliverables and topics with i=
mportant open issues to resolve. In the case of individual IDs, the goal is=
n't necessarily to present what is in the draft but rather to help the WG d=
ecide what to do with the ID. With that in mind, when making an agenda requ=
est please consider what you think the WG should do with its content. For e=
xample:

  *   Does the document have useful content that should be moved into anoth=
er WG document or progress on it's own merit
  *   Does the content have a good basis for one of the WG documents per th=
e charter (in order for that to happen the document needs to be the most ap=
propriate out of the collection of related documents)
  *   Should the document content be merged with one or more other document=
s, so that a combined document could become a WG document
Jim & Thomas
_______________________________________________
sfc mailing list
sfc@ietf.org<mailto:sfc@ietf.org>
https://www.ietf.org/mailman/listinfo/sfc

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</head>
<body lang=3D"ZH-CN" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi Greg,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">However, R=
FC5586 explicitly states that &#8220;The G-ACh MUST NOT be used to transpor=
t user traffic.&#8221; Anyway, it seems that we need a way to indentify
 the payload type of the MPLS packet (e.g., metadata, Ethernet frame, IP pa=
cket) in the MPLS-based SFC case.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Best regar=
ds<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Xiaohu</sp=
an><span lang=3D"EN" style=3D"font-size:16.0pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;;color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span =
lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&qu=
ot;sans-serif&quot;"> Gregory Mirsky [mailto:gregory.mirsky@ericsson.com]
<br>
<b>Sent:</b> Friday, October 31, 2014 2:24 PM<br>
<b>To:</b> Xuxiaohu; Ron Parker<br>
<b>Cc:</b> mpls@ietf.org; &lt;spring@ietf.org&gt;; sfc@ietf.org<br>
<b>Subject:</b> RE: [sfc] About the possibility of using MPLS source routin=
g (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda<o:=
p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi Xiaohu,=
 Ron, et. al,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">what if me=
tadata carried over SF ACH type?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; Greg
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&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 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span =
lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&qu=
ot;sans-serif&quot;"> mpls [<a href=3D"mailto:mpls-bounces@ietf.org">mailto=
:mpls-bounces@ietf.org</a>]
<b>On Behalf Of </b>Xuxiaohu<br>
<b>Sent:</b> Thursday, October 30, 2014 7:28 PM<br>
<b>To:</b> Ron Parker<br>
<b>Cc:</b> <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>; &lt;<a href=
=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;;
<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<b>Subject:</b> Re: [mpls] [sfc] About the possibility of using MPLS source=
 routing (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting ag=
enda<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi Ron,<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Did you me=
an an SPL(Special Purpose Label) or an ESPL(Extended Special Purpose Label)=
 by a well-known global label? If so, additional SPLs or ESPLs
 would need to be allocated for different MPLS payload, such as Ethernet fr=
ame and IP packet. However I wonder whether it is the normal usage of the S=
PL and ESPL space (i.e., used as a protocol type identifier)?<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Best regar=
ds,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Xiaohu<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span =
lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&qu=
ot;sans-serif&quot;"> Ron Parker [<a href=3D"mailto:Ron_Parker@affirmednetw=
orks.com">mailto:Ron_Parker@affirmednetworks.com</a>]
<br>
<b>Sent:</b> Friday, October 31, 2014 4:45 AM<br>
<b>To:</b> Xuxiaohu<br>
<b>Cc:</b> <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a>; <a href=3D"mai=
lto:mpls@ietf.org">
mpls@ietf.org</a>; &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</=
a>&gt;<br>
<b>Subject:</b> Re: [sfc] About the possibility of using MPLS source routin=
g (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda<o:=
p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Xiaohu,<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Regarding carriage of metadata =
-- the MPLS would be only the transport part. &nbsp;What about reserving a =
well known global label that means SCH/NSH header follows. &nbsp;This well =
known label would always be at the BOS. &nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp; &nbsp;Ron<o:p></o:p></sp=
an></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span lang=3D"EN-US">=
<br>
On Oct 30, 2014, at 3:15 AM, Xuxiaohu &lt;<a href=3D"mailto:xuxiaohu@huawei=
.com">xuxiaohu@huawei.com</a>&gt; wrote:<o:p></o:p></span></p>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:16.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">Hi all,<o:p></o:p></s=
pan></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:16.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:16.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">There are many drafts=
 which mentioned the possibility of using the MPLS source routing (i.e., MP=
LS-SPRING) mechanism for service function chain purpose. However,
 we do need a detailed evaluation of such possibility so as to figure out w=
hether any potential extensions to the MPLS architecture is required. For i=
nstance,
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:16.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:16.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">1) although an MPLS l=
abel stack could be used to indicate an SFP, however, when an SFF-proxy rec=
eives such a MPLS packet, it must know the payload type of
 the MPLS packet before sending the original packet to the corresponding le=
gacy SF. How? In fact, even in the non-legacy SF case, should the SFF direc=
tly forward the MPLS packet to the corresponding SF directly or strip the M=
PLS header before sending the packet
 to the corresponding SF? In the former case, the corresponding SF should k=
now the payload type of the MPLS packet. In the latter case, the SFF should=
 know the payload type. To identify the payload type, one way is to allocat=
e a separate local label for each
 payload type (is this a scalable way?), another way is to allocate an SPL =
or an ESPL for each payload type (is this the normal purpose of the SPL or =
ESPL), a third way is to introduce a SPL or ESPL which is followed by a pro=
tocol id header (is this a significant
 change to the MPLS architecture?).<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:16.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:16.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">2) assume an SFF need=
s to strip the
</span><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-family:&quot;Cou=
rier New&quot;">&#8220;</span><span lang=3D"EN-US" style=3D"font-size:16.0p=
t;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">whole</span><span=
 lang=3D"EN-US" style=3D"font-size:16.0pt;font-family:&quot;Courier New&quo=
t;">&#8221;</span><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-famil=
y:&quot;Calibri&quot;,&quot;sans-serif&quot;">
 MPLS header before sending the packet to the corresponding SF, does it mea=
n a big change to the current MPLS forwarding plane?<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:16.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:16.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">3) when using an MPLS=
 label stack to indicate an SFC rather than an SFP, each SF would have to b=
e identified by a domain-wide label. One way is to reserve
 the same label range for SF SID purpose by all the SFFs. Another way is to=
 rely on the context label concept (i.e., each SF of an SFC would have to b=
e represented by two labels in the label stack, one is the context indicati=
on label, the other is the label
 allocated from that context label space for that SF ). However, it seems t=
hat the domain-wide label usage is still a controversial topic in the IETF =
community.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:16.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:16.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">4) how to convey meta=
data in an MPLS packet? This issue may be the same as issue 1.<o:p></o:p></=
span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:16.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:16.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">Any comments?<o:p></o=
:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:16.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">&nbsp;<o:p></o:p></sp=
an></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:16.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">Best regards,<o:p></o=
:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US" style=3D"font-size:16.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;">Xiaohu<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span =
lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&qu=
ot;sans-serif&quot;"> Jim Guichard (jguichar) [<a href=3D"mailto:jguichar@c=
isco.com">mailto:jguichar@cisco.com</a>]
<br>
<b>Sent:</b> Wednesday, October 29, 2014 8:15 PM<br>
<b>To:</b> Xuxiaohu; Thomas Narten<br>
<b>Subject:</b> Re: SFC Honolulu meeting agenda</span><span lang=3D"EN-US">=
<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;<o:p></o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Hi Xiaohu,</=
span><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">&nbsp;</span=
><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Our agenda i=
s not yet finalized but we will only be allowing slots for drafts that have=
 had mailing list discussion and are directly related to our
 immediate deliverables. For this reason we are unable to allocate time for=
 discussion of your draft in HI. &nbsp;Please feel free to continue to soli=
cit discussion on the SFC mailing list.</span><span lang=3D"EN-US"><o:p></o=
:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">&nbsp;</span=
><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Jim &amp; Th=
omas</span><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">&nbsp;</span=
><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">From:
</span></b><span lang=3D"EN-US" style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:black">Xuxiaohu &lt;<a href=3D"=
mailto:xuxiaohu@huawei.com">xuxiaohu@huawei.com</a>&gt;<br>
<b>Date: </b>Tuesday, October 28, 2014 at 11:30 PM<br>
<b>To: </b>Jim Guichard &lt;<a href=3D"mailto:jguichar@cisco.com">jguichar@=
cisco.com</a>&gt;, Thomas Narten &lt;<a href=3D"mailto:narten@us.ibm.com">n=
arten@us.ibm.com</a>&gt;<br>
<b>Subject: </b>RE: SFC Honolulu meeting agenda</span><span lang=3D"EN-US">=
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">&nbsp;</span=
><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi co-chai=
rs,</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">I found th=
ere are still available time on the SFC agenda. Hence I wonder whether you =
could allocate a 15-min slot for presenting this draft.</span><span lang=3D=
"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Best regar=
ds,</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Xiaohu</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:black">From:</spa=
n></b><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Taho=
ma&quot;,&quot;sans-serif&quot;;color:black"> Xuxiaohu
<br>
<b>Sent:</b> Wednesday, October 08, 2014 4:50 PM<br>
<b>To:</b> 'Jim Guichard (jguichar)'; <a href=3D"mailto:sfc@ietf.org">sfc@i=
etf.org</a><br>
<b>Subject:</b> RE: SFC Honolulu meeting agenda</span><span lang=3D"EN-US">=
<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:black">&nbsp;</s=
pan><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Hi co-chai=
rs,</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">I would li=
ke to request a 15-min slot for presenting the following draft (<a href=3D"=
https://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-00"><span style=
=3D"color:#1F497D;text-decoration:none">https://tools.ietf.org/html/draft-x=
u-sfc-using-mpls-spring-00</span></a>).
 Since &#8220;Generic SFC Encapsulation&#8221; is one of the WG charter del=
iverables and the charter states that &#8220;&#8230;The working group will =
consider using an existing encapsulation (with extensions as appropriate) i=
f a suitable candidate is found...&#8221; I would like the WG
 to help evaluating whether the MPLS-SPRING-based SFC encapsulation approac=
h as described in the above draft could be considered as one of the candida=
tes.</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Best regar=
ds,</span><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Xiaohu</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:16.0pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</sp=
an><span lang=3D"EN-US"><o:p></o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:black">From:</spa=
n></b><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Taho=
ma&quot;,&quot;sans-serif&quot;;color:black"> sfc [<a href=3D"mailto:sfc-bo=
unces@ietf.org">mailto:sfc-bounces@ietf.org</a>]
<b>On Behalf Of </b>Jim Guichard (jguichar)<br>
<b>Sent:</b> Monday, October 06, 2014 9:27 PM<br>
<b>To:</b> <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<b>Subject:</b> [sfc] SFC Honolulu meeting agenda</span><span lang=3D"EN-US=
"><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:black">&nbsp;</s=
pan><span lang=3D"EN-US"><o:p></o:p></span></p>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Greetings WG=
:</span><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">&nbsp;</span=
><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Our meeting =
at the upcoming Honolulu venue is fast approaching. &nbsp;</span><span lang=
=3D"EN-US" style=3D"font-size:13.5pt;font-family:&quot;Calibri&quot;,&quot;=
sans-serif&quot;;color:black">As&nbsp;always,
 the goal of the meeting will be to make the best use of&nbsp;limited face-=
to-face time.</span><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">&nbsp;</span=
><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">As we build =
the meeting agenda we welcome requests for agenda time. As always, the goal=
 of a meeting slot is to best further the work of the WG,
 and that generally means focussing on key charter deliverables and topics =
with important open issues to resolve. In the case of individual IDs, the g=
oal isn&#8217;t necessarily to present what is in the draft but rather to h=
elp the WG decide what to do with the
 ID. With that in mind, when making an agenda request please consider what =
you think the WG should do with its content. For example:</span><span lang=
=3D"EN-US"><o:p></o:p></span></p>
</div>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l0 level1 lfo3">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Does the document have useful content that shou=
ld be moved into another WG document or progress on it&#8217;s own merit</s=
pan><span lang=3D"EN-US"><o:p></o:p></span></li><li class=3D"MsoNormal" sty=
le=3D"color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-li=
st:l0 level1 lfo3">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Does the content have a good basis for one of t=
he WG documents per the charter (in order for that to happen the document n=
eeds to be the most appropriate out of the collection of
 related documents)</span><span lang=3D"EN-US"><o:p></o:p></span></li><li c=
lass=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-margin-=
bottom-alt:auto;mso-list:l0 level1 lfo3">
<span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibri&qu=
ot;,&quot;sans-serif&quot;">Should the document content be merged with one =
or more other documents, so that a combined document could become a WG docu=
ment</span><span lang=3D"EN-US"><o:p></o:p></span></li></ul>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:13.5pt;font-=
family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:black">Jim &amp; Th=
omas</span><span lang=3D"EN-US"><o:p></o:p></span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">_______________________________=
________________<br>
sfc mailing list<br>
<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/sfc">https://www.ietf.org/=
mailman/listinfo/sfc</a><o:p></o:p></span></p>
</div>
</blockquote>
</div>
</div>
</div>
</body>
</html>

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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: Xuxiaohu <xuxiaohu@huawei.com>, Ron Parker <Ron_Parker@affirmednetworks.com>
Thread-Topic: [sfc] About the possibility of using MPLS source routing (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda
Thread-Index: AQHP4WkpFJPaLJGjIUWt43ZhzuIOrJwl4oHQgCCrkLCAAKOpgIABXyHggAAq7QCAAOSVsIAAQdCw
Date: Fri, 31 Oct 2014 06:23:43 +0000
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References: <D05810C8.39E9E%jguichar@cisco.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE082C80A7@NKGEML512-MBS.china.huawei.com> <D07651BA.3BA95%jguichar@cisco.com>, <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE082C8644@NKGEML512-MBS.china.huawei.com> <3A2D6E6C-9AB6-4214-887A-42E7ADC2EB6B@affirmednetworks.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE082C8A6E@NKGEML512-MBS.china.huawei.com>
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Subject: Re: [sfc] About the possibility of using MPLS source routing (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda
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Hi Xiaohu, Ron, et. al,
what if metadata carried over SF ACH type?

                Regards,
                                Greg

From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Xuxiaohu
Sent: Thursday, October 30, 2014 7:28 PM
To: Ron Parker
Cc: mpls@ietf.org; <spring@ietf.org>; sfc@ietf.org
Subject: Re: [mpls] [sfc] About the possibility of using MPLS source routin=
g (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda

Hi Ron,

Did you mean an SPL(Special Purpose Label) or an ESPL(Extended Special Purp=
ose Label) by a well-known global label? If so, additional SPLs or ESPLs wo=
uld need to be allocated for different MPLS payload, such as Ethernet frame=
 and IP packet. However I wonder whether it is the normal usage of the SPL =
and ESPL space (i.e., used as a protocol type identifier)?

Best regards,
Xiaohu

From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
Sent: Friday, October 31, 2014 4:45 AM
To: Xuxiaohu
Cc: sfc@ietf.org<mailto:sfc@ietf.org>; mpls@ietf.org<mailto:mpls@ietf.org>;=
 <spring@ietf.org<mailto:spring@ietf.org>>
Subject: Re: [sfc] About the possibility of using MPLS source routing (i.e.=
, MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda

Xiaohu,

Regarding carriage of metadata -- the MPLS would be only the transport part=
.  What about reserving a well known global label that means SCH/NSH header=
 follows.  This well known label would always be at the BOS.

   Ron


On Oct 30, 2014, at 3:15 AM, Xuxiaohu <xuxiaohu@huawei.com<mailto:xuxiaohu@=
huawei.com>> wrote:

Hi all,



There are many drafts which mentioned the possibility of using the MPLS sou=
rce routing (i.e., MPLS-SPRING) mechanism for service function chain purpos=
e. However, we do need a detailed evaluation of such possibility so as to f=
igure out whether any potential extensions to the MPLS architecture is requ=
ired. For instance,



1) although an MPLS label stack could be used to indicate an SFP, however, =
when an SFF-proxy receives such a MPLS packet, it must know the payload typ=
e of the MPLS packet before sending the original packet to the correspondin=
g legacy SF. How? In fact, even in the non-legacy SF case, should the SFF d=
irectly forward the MPLS packet to the corresponding SF directly or strip t=
he MPLS header before sending the packet to the corresponding SF? In the fo=
rmer case, the corresponding SF should know the payload type of the MPLS pa=
cket. In the latter case, the SFF should know the payload type. To identify=
 the payload type, one way is to allocate a separate local label for each p=
ayload type (is this a scalable way?), another way is to allocate an SPL or=
 an ESPL for each payload type (is this the normal purpose of the SPL or ES=
PL), a third way is to introduce a SPL or ESPL which is followed by a proto=
col id header (is this a significant change to the MPLS architecture?).



2) assume an SFF needs to strip the "whole" MPLS header before sending the =
packet to the corresponding SF, does it mean a big change to the current MP=
LS forwarding plane?



3) when using an MPLS label stack to indicate an SFC rather than an SFP, ea=
ch SF would have to be identified by a domain-wide label. One way is to res=
erve the same label range for SF SID purpose by all the SFFs. Another way i=
s to rely on the context label concept (i.e., each SF of an SFC would have =
to be represented by two labels in the label stack, one is the context indi=
cation label, the other is the label allocated from that context label spac=
e for that SF ). However, it seems that the domain-wide label usage is stil=
l a controversial topic in the IETF community.



4) how to convey metadata in an MPLS packet? This issue may be the same as =
issue 1.



Any comments?



Best regards,

Xiaohu


From: Jim Guichard (jguichar) [mailto:jguichar@cisco.com]
Sent: Wednesday, October 29, 2014 8:15 PM
To: Xuxiaohu; Thomas Narten
Subject: Re: SFC Honolulu meeting agenda

Hi Xiaohu,

Our agenda is not yet finalized but we will only be allowing slots for draf=
ts that have had mailing list discussion and are directly related to our im=
mediate deliverables. For this reason we are unable to allocate time for di=
scussion of your draft in HI.  Please feel free to continue to solicit disc=
ussion on the SFC mailing list.

Jim & Thomas

From: Xuxiaohu <xuxiaohu@huawei.com<mailto:xuxiaohu@huawei.com>>
Date: Tuesday, October 28, 2014 at 11:30 PM
To: Jim Guichard <jguichar@cisco.com<mailto:jguichar@cisco.com>>, Thomas Na=
rten <narten@us.ibm.com<mailto:narten@us.ibm.com>>
Subject: RE: SFC Honolulu meeting agenda

Hi co-chairs,

I found there are still available time on the SFC agenda. Hence I wonder wh=
ether you could allocate a 15-min slot for presenting this draft.

Best regards,
Xiaohu

From: Xuxiaohu
Sent: Wednesday, October 08, 2014 4:50 PM
To: 'Jim Guichard (jguichar)'; sfc@ietf.org<mailto:sfc@ietf.org>
Subject: RE: SFC Honolulu meeting agenda

Hi co-chairs,

I would like to request a 15-min slot for presenting the following draft (h=
ttps://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-00). Since "Gener=
ic SFC Encapsulation" is one of the WG charter deliverables and the charter=
 states that "...The working group will consider using an existing encapsul=
ation (with extensions as appropriate) if a suitable candidate is found..."=
 I would like the WG to help evaluating whether the MPLS-SPRING-based SFC e=
ncapsulation approach as described in the above draft could be considered a=
s one of the candidates.

Best regards,
Xiaohu

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Jim Guichard (jguichar=
)
Sent: Monday, October 06, 2014 9:27 PM
To: sfc@ietf.org<mailto:sfc@ietf.org>
Subject: [sfc] SFC Honolulu meeting agenda

Greetings WG:

Our meeting at the upcoming Honolulu venue is fast approaching.  As always,=
 the goal of the meeting will be to make the best use of limited face-to-fa=
ce time.

As we build the meeting agenda we welcome requests for agenda time. As alwa=
ys, the goal of a meeting slot is to best further the work of the WG, and t=
hat generally means focussing on key charter deliverables and topics with i=
mportant open issues to resolve. In the case of individual IDs, the goal is=
n't necessarily to present what is in the draft but rather to help the WG d=
ecide what to do with the ID. With that in mind, when making an agenda requ=
est please consider what you think the WG should do with its content. For e=
xample:

  *   Does the document have useful content that should be moved into anoth=
er WG document or progress on it's own merit
  *   Does the content have a good basis for one of the WG documents per th=
e charter (in order for that to happen the document needs to be the most ap=
propriate out of the collection of related documents)
  *   Should the document content be merged with one or more other document=
s, so that a combined document could become a WG document
Jim & Thomas
_______________________________________________
sfc mailing list
sfc@ietf.org<mailto:sfc@ietf.org>
https://www.ietf.org/mailman/listinfo/sfc

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<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 Xiaohu, Ron, et. al,<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">what if metadata carried =
over SF ACH type?<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">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regards,<=
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;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp; Greg
<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>
<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;"> mpls [ma=
ilto:mpls-bounces@ietf.org]
<b>On Behalf Of </b>Xuxiaohu<br>
<b>Sent:</b> Thursday, October 30, 2014 7:28 PM<br>
<b>To:</b> Ron Parker<br>
<b>Cc:</b> mpls@ietf.org; &lt;spring@ietf.org&gt;; sfc@ietf.org<br>
<b>Subject:</b> Re: [mpls] [sfc] About the possibility of using MPLS source=
 routing (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting ag=
enda<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Hi Ron,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Did you mean an SPL(Special Purpose Label) or an ESPL(Extended Special Pu=
rpose Label) by a well-known global label? If so, additional
 SPLs or ESPLs would need to be allocated for different MPLS payload, such =
as Ethernet frame and IP packet. However I wonder whether it is the normal =
usage of the SPL and ESPL space (i.e., used as a protocol type identifier)?=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Best regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Xiaohu<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #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;;mso-fareast-language:ZH-CN">From:</spa=
n></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;=
sans-serif&quot;;mso-fareast-language:ZH-CN"> Ron Parker [<a href=3D"mailto=
:Ron_Parker@affirmednetworks.com">mailto:Ron_Parker@affirmednetworks.com</a=
>]
<br>
<b>Sent:</b> Friday, October 31, 2014 4:45 AM<br>
<b>To:</b> Xuxiaohu<br>
<b>Cc:</b> <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a>; <a href=3D"mai=
lto:mpls@ietf.org">
mpls@ietf.org</a>; &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</=
a>&gt;<br>
<b>Subject:</b> Re: [sfc] About the possibility of using MPLS source routin=
g (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda<o:=
p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Xiaohu,<o=
:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Regarding=
 carriage of metadata -- the MPLS would be only the transport part. &nbsp;W=
hat about reserving a well known global label that means SCH/NSH header fol=
lows. &nbsp;This well known label would always
 be at the BOS. &nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&nbsp; &n=
bsp;Ron<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"mso-fa=
reast-language:ZH-CN"><br>
On Oct 30, 2014, at 3:15 AM, Xuxiaohu &lt;<a href=3D"mailto:xuxiaohu@huawei=
.com">xuxiaohu@huawei.com</a>&gt; wrote:<o:p></o:p></span></p>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:ZH-CN">Hi all=
,<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;=
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:ZH-CN">There =
are many drafts which mentioned the possibility of using the MPLS source ro=
uting (i.e., MPLS-SPRING) mechanism for service function chain purpose. How=
ever, we do need a detailed evaluation
 of such possibility so as to figure out whether any potential extensions t=
o the MPLS architecture is required. For instance,
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;=
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:ZH-CN">1) alt=
hough an MPLS label stack could be used to indicate an SFP, however, when a=
n SFF-proxy receives such a MPLS packet, it must know the payload type of t=
he MPLS packet before sending the original
 packet to the corresponding legacy SF. How? In fact, even in the non-legac=
y SF case, should the SFF directly forward the MPLS packet to the correspon=
ding SF directly or strip the MPLS header before sending the packet to the =
corresponding SF? In the former
 case, the corresponding SF should know the payload type of the MPLS packet=
. In the latter case, the SFF should know the payload type. To identify the=
 payload type, one way is to allocate a separate local label for each paylo=
ad type (is this a scalable way?),
 another way is to allocate an SPL or an ESPL for each payload type (is thi=
s the normal purpose of the SPL or ESPL), a third way is to introduce a SPL=
 or ESPL which is followed by a protocol id header (is this a significant c=
hange to the MPLS architecture?).<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;=
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:ZH-CN">2) ass=
ume an SFF needs to strip the
</span><span style=3D"font-family:&quot;Courier New&quot;;mso-fareast-langu=
age:ZH-CN">&#8220;</span><span style=3D"mso-fareast-language:ZH-CN">whole</=
span><span style=3D"font-family:&quot;Courier New&quot;;mso-fareast-languag=
e:ZH-CN">&#8221;</span><span style=3D"mso-fareast-language:ZH-CN"> MPLS
 header before sending the packet to the corresponding SF, does it mean a b=
ig change to the current MPLS forwarding plane?<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;=
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:ZH-CN">3) whe=
n using an MPLS label stack to indicate an SFC rather than an SFP, each SF =
would have to be identified by a domain-wide label. One way is to reserve t=
he same label range for SF SID purpose
 by all the SFFs. Another way is to rely on the context label concept (i.e.=
, each SF of an SFC would have to be represented by two labels in the label=
 stack, one is the context indication label, the other is the label allocat=
ed from that context label space
 for that SF ). However, it seems that the domain-wide label usage is still=
 a controversial topic in the IETF community.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;=
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:ZH-CN">4) how=
 to convey metadata in an MPLS packet? This issue may be the same as issue =
1.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;=
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:ZH-CN">Any co=
mments?<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;=
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:ZH-CN">Best r=
egards,<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"mso-fareast-language:ZH-CN">Xiaohu=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #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;;mso-fareast-language:ZH-CN">From:</spa=
n></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;=
sans-serif&quot;;mso-fareast-language:ZH-CN"> Jim Guichard (jguichar) [<a h=
ref=3D"mailto:jguichar@cisco.com">mailto:jguichar@cisco.com</a>]
<br>
<b>Sent:</b> Wednesday, October 29, 2014 8:15 PM<br>
<b>To:</b> Xuxiaohu; Thomas Narten<br>
<b>Subject:</b> Re: SFC Honolulu meeting agenda</span><span style=3D"mso-fa=
reast-language:ZH-CN"><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:=
p></o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
Hi Xiaohu,</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></sp=
an></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
Our agenda is not yet finalized but we will only be allowing slots for draf=
ts that have had mailing list discussion and are directly
 related to our immediate deliverables. For this reason we are unable to al=
locate time for discussion of your draft in HI. &nbsp;Please feel free to c=
ontinue to solicit discussion on the SFC mailing list.</span><span style=3D=
"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
Jim &amp; Thomas</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:=
p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></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:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-C=
N">From:
</span></b><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,=
&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">Xuxiaohu &lt=
;<a href=3D"mailto:xuxiaohu@huawei.com">xuxiaohu@huawei.com</a>&gt;<br>
<b>Date: </b>Tuesday, October 28, 2014 at 11:30 PM<br>
<b>To: </b>Jim Guichard &lt;<a href=3D"mailto:jguichar@cisco.com">jguichar@=
cisco.com</a>&gt;, Thomas Narten &lt;<a href=3D"mailto:narten@us.ibm.com">n=
arten@us.ibm.com</a>&gt;<br>
<b>Subject: </b>RE: SFC Honolulu meeting agenda</span><span style=3D"mso-fa=
reast-language:ZH-CN"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span><=
/p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Hi co-chairs,</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">I found there are still available time on the SFC agenda. Hence I wonder =
whether you could allocate a 15-min slot for presenting
 this draft.</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Best regards,</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Xiaohu</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #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;;color:black;mso-fareast-language:ZH-CN=
">From:</span></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&=
quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN"> Xuxia=
ohu
<br>
<b>Sent:</b> Wednesday, October 08, 2014 4:50 PM<br>
<b>To:</b> 'Jim Guichard (jguichar)'; <a href=3D"mailto:sfc@ietf.org">sfc@i=
etf.org</a><br>
<b>Subject:</b> RE: SFC Honolulu meeting agenda</span><span style=3D"mso-fa=
reast-language:ZH-CN"><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"color:black;mso-fareast-language:ZH-C=
N">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Hi co-chairs,</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">I would like to request a 15-min slot for presenting the following draft =
(<a href=3D"https://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-00">=
<span style=3D"color:#1F497D;text-decoration:none">https://tools.ietf.org/h=
tml/draft-xu-sfc-using-mpls-spring-00</span></a>).
 Since &#8220;Generic SFC Encapsulation&#8221; is one of the WG charter del=
iverables and the charter states that &#8220;&#8230;The working group will =
consider using an existing encapsulation (with extensions as appropriate) i=
f a suitable candidate is found...&#8221; I would like the WG
 to help evaluating whether the MPLS-SPRING-based SFC encapsulation approac=
h as described in the above draft could be considered as one of the candida=
tes.</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Best regards,</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Xiaohu</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #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;;color:black;mso-fareast-language:ZH-CN=
">From:</span></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&=
quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN"> sfc [=
<a href=3D"mailto:sfc-bounces@ietf.org">mailto:sfc-bounces@ietf.org</a>]
<b>On Behalf Of </b>Jim Guichard (jguichar)<br>
<b>Sent:</b> Monday, October 06, 2014 9:27 PM<br>
<b>To:</b> <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<b>Subject:</b> [sfc] SFC Honolulu meeting agenda</span><span style=3D"mso-=
fareast-language:ZH-CN"><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"color:black;mso-fareast-language:ZH-C=
N">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></spa=
n></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
Greetings WG:</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p><=
/span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
Our meeting at the upcoming Honolulu venue is fast approaching. &nbsp;</spa=
n><span style=3D"font-size:13.5pt;font-family:&quot;Calibri&quot;,&quot;san=
s-serif&quot;;color:black;mso-fareast-language:ZH-CN">As&nbsp;always,
 the goal of the meeting will be to make the best use of&nbsp;limited face-=
to-face time.</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p><=
/span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:13.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:13.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
As we build the meeting agenda we welcome requests for agenda time. As alwa=
ys, the goal of a meeting slot is to best further the work
 of the WG, and that generally means focussing on key charter deliverables =
and topics with important open issues to resolve. In the case of individual=
 IDs, the goal isn&#8217;t necessarily to present what is in the draft but =
rather to help the WG decide what to do
 with the ID. With that in mind, when making an agenda request please consi=
der what you think the WG should do with its content. For example:</span><s=
pan style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
</div>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l1 level1 lfo3">
<span style=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-=
serif&quot;;mso-fareast-language:ZH-CN">Does the document have useful conte=
nt that should be moved into another WG document or progress on it&#8217;s =
own merit</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></spa=
n></li><li class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto=
;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3">
<span style=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-=
serif&quot;;mso-fareast-language:ZH-CN">Does the content have a good basis =
for one of the WG documents per the charter (in order for that to happen th=
e document needs to be the most appropriate out of the
 collection of related documents)</span><span style=3D"mso-fareast-language=
:ZH-CN"><o:p></o:p></span></li><li class=3D"MsoNormal" style=3D"color:black=
;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1 lfo3=
">
<span style=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-=
serif&quot;;mso-fareast-language:ZH-CN">Should the document content be merg=
ed with one or more other documents, so that a combined document could beco=
me a WG document</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:=
p></span></li></ul>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:13.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
Jim &amp; Thomas</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:=
p></span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">_________=
______________________________________<br>
sfc mailing list<br>
<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/sfc">https://www.ietf.org/=
mailman/listinfo/sfc</a><o:p></o:p></span></p>
</div>
</blockquote>
</div>
</div>
</body>
</html>

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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: Xuxiaohu <xuxiaohu@huawei.com>, Ron Parker <Ron_Parker@affirmednetworks.com>
Thread-Topic: [sfc] About the possibility of using MPLS source routing (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda
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Subject: Re: [sfc] About the possibility of using MPLS source routing (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda
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Content-Type: text/plain; charset="us-ascii"
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Hi Xiaohu,
yes, you're right but I'd refer to Residence Time Measurement draft. Consid=
er OAM channel that carries SF metadata. Is that a "user traffic"?

                Regards,
                                Greg

From: Xuxiaohu [mailto:xuxiaohu@huawei.com]
Sent: Thursday, October 30, 2014 11:42 PM
To: Gregory Mirsky; Ron Parker
Cc: mpls@ietf.org; <spring@ietf.org>; sfc@ietf.org
Subject: RE: [sfc] About the possibility of using MPLS source routing (i.e.=
, MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda

Hi Greg,

However, RFC5586 explicitly states that "The G-ACh MUST NOT be used to tran=
sport user traffic." Anyway, it seems that we need a way to indentify the p=
ayload type of the MPLS packet (e.g., metadata, Ethernet frame, IP packet) =
in the MPLS-based SFC case.

Best regards
Xiaohu

From: Gregory Mirsky [mailto:gregory.mirsky@ericsson.com]
Sent: Friday, October 31, 2014 2:24 PM
To: Xuxiaohu; Ron Parker
Cc: mpls@ietf.org<mailto:mpls@ietf.org>; <spring@ietf.org<mailto:spring@iet=
f.org>>; sfc@ietf.org<mailto:sfc@ietf.org>
Subject: RE: [sfc] About the possibility of using MPLS source routing (i.e.=
, MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda

Hi Xiaohu, Ron, et. al,
what if metadata carried over SF ACH type?

                Regards,
                                Greg

From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Xuxiaohu
Sent: Thursday, October 30, 2014 7:28 PM
To: Ron Parker
Cc: mpls@ietf.org<mailto:mpls@ietf.org>; <spring@ietf.org<mailto:spring@iet=
f.org>>; sfc@ietf.org<mailto:sfc@ietf.org>
Subject: Re: [mpls] [sfc] About the possibility of using MPLS source routin=
g (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda

Hi Ron,

Did you mean an SPL(Special Purpose Label) or an ESPL(Extended Special Purp=
ose Label) by a well-known global label? If so, additional SPLs or ESPLs wo=
uld need to be allocated for different MPLS payload, such as Ethernet frame=
 and IP packet. However I wonder whether it is the normal usage of the SPL =
and ESPL space (i.e., used as a protocol type identifier)?

Best regards,
Xiaohu

From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
Sent: Friday, October 31, 2014 4:45 AM
To: Xuxiaohu
Cc: sfc@ietf.org<mailto:sfc@ietf.org>; mpls@ietf.org<mailto:mpls@ietf.org>;=
 <spring@ietf.org<mailto:spring@ietf.org>>
Subject: Re: [sfc] About the possibility of using MPLS source routing (i.e.=
, MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda

Xiaohu,

Regarding carriage of metadata -- the MPLS would be only the transport part=
.  What about reserving a well known global label that means SCH/NSH header=
 follows.  This well known label would always be at the BOS.

   Ron


On Oct 30, 2014, at 3:15 AM, Xuxiaohu <xuxiaohu@huawei.com<mailto:xuxiaohu@=
huawei.com>> wrote:

Hi all,



There are many drafts which mentioned the possibility of using the MPLS sou=
rce routing (i.e., MPLS-SPRING) mechanism for service function chain purpos=
e. However, we do need a detailed evaluation of such possibility so as to f=
igure out whether any potential extensions to the MPLS architecture is requ=
ired. For instance,



1) although an MPLS label stack could be used to indicate an SFP, however, =
when an SFF-proxy receives such a MPLS packet, it must know the payload typ=
e of the MPLS packet before sending the original packet to the correspondin=
g legacy SF. How? In fact, even in the non-legacy SF case, should the SFF d=
irectly forward the MPLS packet to the corresponding SF directly or strip t=
he MPLS header before sending the packet to the corresponding SF? In the fo=
rmer case, the corresponding SF should know the payload type of the MPLS pa=
cket. In the latter case, the SFF should know the payload type. To identify=
 the payload type, one way is to allocate a separate local label for each p=
ayload type (is this a scalable way?), another way is to allocate an SPL or=
 an ESPL for each payload type (is this the normal purpose of the SPL or ES=
PL), a third way is to introduce a SPL or ESPL which is followed by a proto=
col id header (is this a significant change to the MPLS architecture?).



2) assume an SFF needs to strip the "whole" MPLS header before sending the =
packet to the corresponding SF, does it mean a big change to the current MP=
LS forwarding plane?



3) when using an MPLS label stack to indicate an SFC rather than an SFP, ea=
ch SF would have to be identified by a domain-wide label. One way is to res=
erve the same label range for SF SID purpose by all the SFFs. Another way i=
s to rely on the context label concept (i.e., each SF of an SFC would have =
to be represented by two labels in the label stack, one is the context indi=
cation label, the other is the label allocated from that context label spac=
e for that SF ). However, it seems that the domain-wide label usage is stil=
l a controversial topic in the IETF community.



4) how to convey metadata in an MPLS packet? This issue may be the same as =
issue 1.



Any comments?



Best regards,

Xiaohu


From: Jim Guichard (jguichar) [mailto:jguichar@cisco.com]
Sent: Wednesday, October 29, 2014 8:15 PM
To: Xuxiaohu; Thomas Narten
Subject: Re: SFC Honolulu meeting agenda

Hi Xiaohu,

Our agenda is not yet finalized but we will only be allowing slots for draf=
ts that have had mailing list discussion and are directly related to our im=
mediate deliverables. For this reason we are unable to allocate time for di=
scussion of your draft in HI.  Please feel free to continue to solicit disc=
ussion on the SFC mailing list.

Jim & Thomas

From: Xuxiaohu <xuxiaohu@huawei.com<mailto:xuxiaohu@huawei.com>>
Date: Tuesday, October 28, 2014 at 11:30 PM
To: Jim Guichard <jguichar@cisco.com<mailto:jguichar@cisco.com>>, Thomas Na=
rten <narten@us.ibm.com<mailto:narten@us.ibm.com>>
Subject: RE: SFC Honolulu meeting agenda

Hi co-chairs,

I found there are still available time on the SFC agenda. Hence I wonder wh=
ether you could allocate a 15-min slot for presenting this draft.

Best regards,
Xiaohu

From: Xuxiaohu
Sent: Wednesday, October 08, 2014 4:50 PM
To: 'Jim Guichard (jguichar)'; sfc@ietf.org<mailto:sfc@ietf.org>
Subject: RE: SFC Honolulu meeting agenda

Hi co-chairs,

I would like to request a 15-min slot for presenting the following draft (h=
ttps://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-00). Since "Gener=
ic SFC Encapsulation" is one of the WG charter deliverables and the charter=
 states that "...The working group will consider using an existing encapsul=
ation (with extensions as appropriate) if a suitable candidate is found..."=
 I would like the WG to help evaluating whether the MPLS-SPRING-based SFC e=
ncapsulation approach as described in the above draft could be considered a=
s one of the candidates.

Best regards,
Xiaohu

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Jim Guichard (jguichar=
)
Sent: Monday, October 06, 2014 9:27 PM
To: sfc@ietf.org<mailto:sfc@ietf.org>
Subject: [sfc] SFC Honolulu meeting agenda

Greetings WG:

Our meeting at the upcoming Honolulu venue is fast approaching.  As always,=
 the goal of the meeting will be to make the best use of limited face-to-fa=
ce time.

As we build the meeting agenda we welcome requests for agenda time. As alwa=
ys, the goal of a meeting slot is to best further the work of the WG, and t=
hat generally means focussing on key charter deliverables and topics with i=
mportant open issues to resolve. In the case of individual IDs, the goal is=
n't necessarily to present what is in the draft but rather to help the WG d=
ecide what to do with the ID. With that in mind, when making an agenda requ=
est please consider what you think the WG should do with its content. For e=
xample:

  *   Does the document have useful content that should be moved into anoth=
er WG document or progress on it's own merit
  *   Does the content have a good basis for one of the WG documents per th=
e charter (in order for that to happen the document needs to be the most ap=
propriate out of the collection of related documents)
  *   Should the document content be merged with one or more other document=
s, so that a combined document could become a WG document
Jim & Thomas
_______________________________________________
sfc mailing list
sfc@ietf.org<mailto:sfc@ietf.org>
https://www.ietf.org/mailman/listinfo/sfc

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</head>
<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 Xiaohu,<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D">yes, you&#8217;re right b=
ut I&#8217;d refer to Residence Time Measurement draft. Consider OAM channe=
l that carries SF metadata. Is that a &#8220;user traffic&#8221;?<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">&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regards,<=
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;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp; Greg<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>
<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;"> Xuxiaohu=
 [mailto:xuxiaohu@huawei.com]
<br>
<b>Sent:</b> Thursday, October 30, 2014 11:42 PM<br>
<b>To:</b> Gregory Mirsky; Ron Parker<br>
<b>Cc:</b> mpls@ietf.org; &lt;spring@ietf.org&gt;; sfc@ietf.org<br>
<b>Subject:</b> RE: [sfc] About the possibility of using MPLS source routin=
g (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda<o:=
p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Hi Greg,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">However, RFC5586 explicitly states that &#8220;The G-ACh MUST NOT be used=
 to transport user traffic.&#8221; Anyway, it seems that we need a way
 to indentify the payload type of the MPLS packet (e.g., metadata, Ethernet=
 frame, IP packet) in the MPLS-based SFC case.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Best regards<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Xiaohu</span><span lang=3D"EN" style=3D"font-size:16.0pt;font-family:&quo=
t;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:Z=
H-CN"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #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;;mso-fareast-language:ZH-CN">From:</spa=
n></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;=
sans-serif&quot;;mso-fareast-language:ZH-CN"> Gregory Mirsky [<a href=3D"ma=
ilto:gregory.mirsky@ericsson.com">mailto:gregory.mirsky@ericsson.com</a>]
<br>
<b>Sent:</b> Friday, October 31, 2014 2:24 PM<br>
<b>To:</b> Xuxiaohu; Ron Parker<br>
<b>Cc:</b> <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>; &lt;<a href=
=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;;
<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<b>Subject:</b> RE: [sfc] About the possibility of using MPLS source routin=
g (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda<o:=
p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
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:ZH-CN=
">Hi Xiaohu, Ron, et. al,<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:ZH-CN=
">what if metadata carried over SF ACH type?<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:ZH-CN=
"><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;mso-fareast-language:ZH-CN=
">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp; Regards,<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:ZH-CN=
">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Greg
<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:ZH-CN=
"><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;;mso-fareast-language:ZH-CN">From:</spa=
n></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;=
sans-serif&quot;;mso-fareast-language:ZH-CN"> mpls [<a href=3D"mailto:mpls-=
bounces@ietf.org">mailto:mpls-bounces@ietf.org</a>]
<b>On Behalf Of </b>Xuxiaohu<br>
<b>Sent:</b> Thursday, October 30, 2014 7:28 PM<br>
<b>To:</b> Ron Parker<br>
<b>Cc:</b> <a href=3D"mailto:mpls@ietf.org">mpls@ietf.org</a>; &lt;<a href=
=3D"mailto:spring@ietf.org">spring@ietf.org</a>&gt;;
<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<b>Subject:</b> Re: [mpls] [sfc] About the possibility of using MPLS source=
 routing (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting ag=
enda<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Hi Ron,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Did you mean an SPL(Special Purpose Label) or an ESPL(Extended Special Pu=
rpose Label) by a well-known global label? If so, additional
 SPLs or ESPLs would need to be allocated for different MPLS payload, such =
as Ethernet frame and IP packet. However I wonder whether it is the normal =
usage of the SPL and ESPL space (i.e., used as a protocol type identifier)?=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Best regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Xiaohu<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #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;;mso-fareast-language:ZH-CN">From:</spa=
n></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;=
sans-serif&quot;;mso-fareast-language:ZH-CN"> Ron Parker [<a href=3D"mailto=
:Ron_Parker@affirmednetworks.com">mailto:Ron_Parker@affirmednetworks.com</a=
>]
<br>
<b>Sent:</b> Friday, October 31, 2014 4:45 AM<br>
<b>To:</b> Xuxiaohu<br>
<b>Cc:</b> <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a>; <a href=3D"mai=
lto:mpls@ietf.org">
mpls@ietf.org</a>; &lt;<a href=3D"mailto:spring@ietf.org">spring@ietf.org</=
a>&gt;<br>
<b>Subject:</b> Re: [sfc] About the possibility of using MPLS source routin=
g (i.e., MPLS-SPRING) mechanism for SFC//RE: SFC Honolulu meeting agenda<o:=
p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Xiaohu,<o=
:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">Regarding=
 carriage of metadata -- the MPLS would be only the transport part. &nbsp;W=
hat about reserving a well known global label that means SCH/NSH header fol=
lows. &nbsp;This well known label would always
 be at the BOS. &nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&nbsp; &n=
bsp;Ron<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN"><o:p>&nbs=
p;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"mso-fa=
reast-language:ZH-CN"><br>
On Oct 30, 2014, at 3:15 AM, Xuxiaohu &lt;<a href=3D"mailto:xuxiaohu@huawei=
.com">xuxiaohu@huawei.com</a>&gt; wrote:<o:p></o:p></span></p>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoPlainText"><span style=3D"font-size:16.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:ZH-CN">Hi all,<o=
:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:16.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:ZH-CN">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:16.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:ZH-CN">There are=
 many drafts which mentioned the possibility of using the MPLS source routi=
ng (i.e., MPLS-SPRING) mechanism for service function chain
 purpose. However, we do need a detailed evaluation of such possibility so =
as to figure out whether any potential extensions to the MPLS architecture =
is required. For instance,
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:16.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:ZH-CN">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:16.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:ZH-CN">1) althou=
gh an MPLS label stack could be used to indicate an SFP, however, when an S=
FF-proxy receives such a MPLS packet, it must know the payload
 type of the MPLS packet before sending the original packet to the correspo=
nding legacy SF. How? In fact, even in the non-legacy SF case, should the S=
FF directly forward the MPLS packet to the corresponding SF directly or str=
ip the MPLS header before sending
 the packet to the corresponding SF? In the former case, the corresponding =
SF should know the payload type of the MPLS packet. In the latter case, the=
 SFF should know the payload type. To identify the payload type, one way is=
 to allocate a separate local label
 for each payload type (is this a scalable way?), another way is to allocat=
e an SPL or an ESPL for each payload type (is this the normal purpose of th=
e SPL or ESPL), a third way is to introduce a SPL or ESPL which is followed=
 by a protocol id header (is this
 a significant change to the MPLS architecture?).<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:16.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:ZH-CN">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:16.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:ZH-CN">2) assume=
 an SFF needs to strip the
</span><span style=3D"font-size:16.0pt;font-family:&quot;Courier New&quot;;=
mso-fareast-language:ZH-CN">&#8220;</span><span style=3D"font-size:16.0pt;f=
ont-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:=
ZH-CN">whole</span><span style=3D"font-size:16.0pt;font-family:&quot;Courie=
r New&quot;;mso-fareast-language:ZH-CN">&#8221;</span><span style=3D"font-s=
ize:16.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;mso-farea=
st-language:ZH-CN">
 MPLS header before sending the packet to the corresponding SF, does it mea=
n a big change to the current MPLS forwarding plane?<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:16.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:ZH-CN">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:16.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:ZH-CN">3) when u=
sing an MPLS label stack to indicate an SFC rather than an SFP, each SF wou=
ld have to be identified by a domain-wide label. One way
 is to reserve the same label range for SF SID purpose by all the SFFs. Ano=
ther way is to rely on the context label concept (i.e., each SF of an SFC w=
ould have to be represented by two labels in the label stack, one is the co=
ntext indication label, the other
 is the label allocated from that context label space for that SF ). Howeve=
r, it seems that the domain-wide label usage is still a controversial topic=
 in the IETF community.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:16.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:ZH-CN">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:16.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:ZH-CN">4) how to=
 convey metadata in an MPLS packet? This issue may be the same as issue 1.<=
o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:16.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:ZH-CN">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:16.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:ZH-CN">Any comme=
nts?<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:16.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:ZH-CN">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:16.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:ZH-CN">Best rega=
rds,<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-size:16.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;mso-fareast-language:ZH-CN">Xiaohu<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #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;;mso-fareast-language:ZH-CN">From:</spa=
n></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;=
sans-serif&quot;;mso-fareast-language:ZH-CN"> Jim Guichard (jguichar) [<a h=
ref=3D"mailto:jguichar@cisco.com">mailto:jguichar@cisco.com</a>]
<br>
<b>Sent:</b> Wednesday, October 29, 2014 8:15 PM<br>
<b>To:</b> Xuxiaohu; Thomas Narten<br>
<b>Subject:</b> Re: SFC Honolulu meeting agenda</span><span style=3D"mso-fa=
reast-language:ZH-CN"><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">&nbsp;<o:=
p></o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
Hi Xiaohu,</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></sp=
an></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
Our agenda is not yet finalized but we will only be allowing slots for draf=
ts that have had mailing list discussion and are directly
 related to our immediate deliverables. For this reason we are unable to al=
locate time for discussion of your draft in HI. &nbsp;Please feel free to c=
ontinue to solicit discussion on the SFC mailing list.</span><span style=3D=
"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
Jim &amp; Thomas</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:=
p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></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:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-C=
N">From:
</span></b><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,=
&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">Xuxiaohu &lt=
;<a href=3D"mailto:xuxiaohu@huawei.com">xuxiaohu@huawei.com</a>&gt;<br>
<b>Date: </b>Tuesday, October 28, 2014 at 11:30 PM<br>
<b>To: </b>Jim Guichard &lt;<a href=3D"mailto:jguichar@cisco.com">jguichar@=
cisco.com</a>&gt;, Thomas Narten &lt;<a href=3D"mailto:narten@us.ibm.com">n=
arten@us.ibm.com</a>&gt;<br>
<b>Subject: </b>RE: SFC Honolulu meeting agenda</span><span style=3D"mso-fa=
reast-language:ZH-CN"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span><=
/p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Hi co-chairs,</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">I found there are still available time on the SFC agenda. Hence I wonder =
whether you could allocate a 15-min slot for presenting
 this draft.</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Best regards,</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Xiaohu</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #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;;color:black;mso-fareast-language:ZH-CN=
">From:</span></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&=
quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN"> Xuxia=
ohu
<br>
<b>Sent:</b> Wednesday, October 08, 2014 4:50 PM<br>
<b>To:</b> 'Jim Guichard (jguichar)'; <a href=3D"mailto:sfc@ietf.org">sfc@i=
etf.org</a><br>
<b>Subject:</b> RE: SFC Honolulu meeting agenda</span><span style=3D"mso-fa=
reast-language:ZH-CN"><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"color:black;mso-fareast-language:ZH-C=
N">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Hi co-chairs,</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">I would like to request a 15-min slot for presenting the following draft =
(<a href=3D"https://tools.ietf.org/html/draft-xu-sfc-using-mpls-spring-00">=
<span style=3D"color:#1F497D;text-decoration:none">https://tools.ietf.org/h=
tml/draft-xu-sfc-using-mpls-spring-00</span></a>).
 Since &#8220;Generic SFC Encapsulation&#8221; is one of the WG charter del=
iverables and the charter states that &#8220;&#8230;The working group will =
consider using an existing encapsulation (with extensions as appropriate) i=
f a suitable candidate is found...&#8221; I would like the WG
 to help evaluating whether the MPLS-SPRING-based SFC encapsulation approac=
h as described in the above draft could be considered as one of the candida=
tes.</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Best regards,</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">Xiaohu</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:16.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:#1F497D;mso-fareast-language:ZH-CN=
">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span=
></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #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;;color:black;mso-fareast-language:ZH-CN=
">From:</span></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&=
quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN"> sfc [=
<a href=3D"mailto:sfc-bounces@ietf.org">mailto:sfc-bounces@ietf.org</a>]
<b>On Behalf Of </b>Jim Guichard (jguichar)<br>
<b>Sent:</b> Monday, October 06, 2014 9:27 PM<br>
<b>To:</b> <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<b>Subject:</b> [sfc] SFC Honolulu meeting agenda</span><span style=3D"mso-=
fareast-language:ZH-CN"><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"color:black;mso-fareast-language:ZH-C=
N">&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></spa=
n></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
Greetings WG:</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p><=
/span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
Our meeting at the upcoming Honolulu venue is fast approaching. &nbsp;</spa=
n><span style=3D"font-size:13.5pt;font-family:&quot;Calibri&quot;,&quot;san=
s-serif&quot;;color:black;mso-fareast-language:ZH-CN">As&nbsp;always,
 the goal of the meeting will be to make the best use of&nbsp;limited face-=
to-face time.</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p><=
/span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:13.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
&nbsp;</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:13.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
As we build the meeting agenda we welcome requests for agenda time. As alwa=
ys, the goal of a meeting slot is to best further the work
 of the WG, and that generally means focussing on key charter deliverables =
and topics with important open issues to resolve. In the case of individual=
 IDs, the goal isn&#8217;t necessarily to present what is in the draft but =
rather to help the WG decide what to do
 with the ID. With that in mind, when making an agenda request please consi=
der what you think the WG should do with its content. For example:</span><s=
pan style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></span></p>
</div>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-ma=
rgin-bottom-alt:auto;mso-list:l0 level1 lfo3">
<span style=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-=
serif&quot;;mso-fareast-language:ZH-CN">Does the document have useful conte=
nt that should be moved into another WG document or progress on it&#8217;s =
own merit</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:p></spa=
n></li><li class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto=
;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo3">
<span style=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-=
serif&quot;;mso-fareast-language:ZH-CN">Does the content have a good basis =
for one of the WG documents per the charter (in order for that to happen th=
e document needs to be the most appropriate out of the
 collection of related documents)</span><span style=3D"mso-fareast-language=
:ZH-CN"><o:p></o:p></span></li><li class=3D"MsoNormal" style=3D"color:black=
;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo3=
">
<span style=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-=
serif&quot;;mso-fareast-language:ZH-CN">Should the document content be merg=
ed with one or more other documents, so that a combined document could beco=
me a WG document</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:=
p></span></li></ul>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:13.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:ZH-CN">=
Jim &amp; Thomas</span><span style=3D"mso-fareast-language:ZH-CN"><o:p></o:=
p></span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><span style=3D"mso-fareast-language:ZH-CN">_________=
______________________________________<br>
sfc mailing list<br>
<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/sfc">https://www.ietf.org/=
mailman/listinfo/sfc</a><o:p></o:p></span></p>
</div>
</blockquote>
</div>
</div>
</div>
</body>
</html>

--_000_7347100B5761DC41A166AC17F22DF1121B877F01eusaamb103erics_--


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From: Dave Dolson <ddolson@sandvine.com>
To: "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: questions on draft-quinn-sfc-nsh-03
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Subject: [sfc] questions on draft-quinn-sfc-nsh-03
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After reading draft-quinn-sfc-nsh-03, I have some questions and comments:

The optional TLV format:
- the TLV length should by in bytes (vs. words), allowing strings that aren=
't a multiple of 4 bytes, with padding to 4-byte alignment. This is the Dia=
meter approach, for example. (RFC6733)
- Encoding "critical" in upper bit of Type is confusing. Why not use one of=
 the reserved flags in the header? Or make type 7 bit field?
- the wording about critical should be clarified. "Receiver" devices MUST d=
rop and "transit" devices MUST NOT drop; neither "receiver" nor "transit" i=
s clearly defined. I think you intend that the critical types must be under=
stood by the end-point (e.g., the protocol end-point addressed by the GRE p=
acket).

The definition of service index action is not precise. It says that if it i=
s zero, the packet is to be dropped,  but I could not understand if that me=
ans if received with a zero or if received with "1" and decremented to zero=
?
Instead, I claim that a packet received with a service index of zero is act=
ually a valid packet if this is the end of the chain and the packet is de-e=
ncapsulated.
It would be a configuration error for there to be a forwarding entry that h=
as another hop in the chain for service index zero.
(My understanding is that an NSH forwarding table is indexed by at least {p=
ath_id, service_index}, pointing to a record that indicates either next hop=
 in the chain or end of chain.)
Of course, lack of an entry in NSH forwarding table would also cause the pa=
cket to be dropped.

I feel that it is not necessary to fix the number of mandatory headers at 4=
. The number of headers could be subject to the scheme of the MD type, allo=
wing optimization to different use cases. Maybe 2 or 5 are useful in differ=
ent cases.

There is no discussion of fragmentation or prohibition thereof.

Thanks,
David Dolson
Senior Software Architect
Sandvine


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<p class=3D"MsoNormal">After reading draft-quinn-sfc-nsh-03, I have some qu=
estions and comments:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The optional TLV format:<o:p></o:p></p>
<p class=3D"MsoNormal">- the TLV length should by in bytes (vs. words), all=
owing strings that aren't a multiple of 4 bytes, with padding to 4-byte ali=
gnment. This is the Diameter approach, for example. (RFC6733)<o:p></o:p></p=
>
<p class=3D"MsoNormal">- Encoding &quot;critical&quot; in upper bit of Type=
 is confusing. Why not use one of the reserved flags in the header? Or make=
 type 7 bit field?<o:p></o:p></p>
<p class=3D"MsoNormal">- the wording about critical should be clarified. &#=
8220;Receiver&#8221; devices MUST drop and &#8220;transit&#8221; devices MU=
ST NOT drop; neither &#8220;receiver&#8221; nor &#8220;transit&#8221; is cl=
early defined. I think you intend that the critical types must be understoo=
d by the
 end-point (e.g., the protocol end-point addressed by the GRE packet).<o:p>=
</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The definition of service index action is not precis=
e. It says that if it is zero, the packet is to be dropped, &nbsp;but I cou=
ld not understand if that means if received with a zero or if received with=
 &quot;1&quot; and decremented to zero?<o:p></o:p></p>
<p class=3D"MsoNormal">Instead, I claim that a packet received with a servi=
ce index of zero is actually a valid packet if this is the end of the chain=
 and the packet is de-encapsulated.<o:p></o:p></p>
<p class=3D"MsoNormal">It would be a configuration error for there to be a =
forwarding entry that has another hop in the chain for service index zero.<=
o:p></o:p></p>
<p class=3D"MsoNormal">(My understanding is that an NSH forwarding table is=
 indexed by at least {path_id, service_index}, pointing to a record that in=
dicates either next hop in the chain or end of chain.)<o:p></o:p></p>
<p class=3D"MsoNormal">Of course, lack of an entry in NSH forwarding table =
would also cause the packet to be dropped.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I feel that it is not necessary to fix the number of=
 mandatory headers at 4. The number of headers could be subject to the sche=
me of the MD type, allowing optimization to different use cases. Maybe 2 or=
 5 are useful in different cases.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">There is no discussion of fragmentation or prohibiti=
on thereof.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal">David Dolson<o:p></o:p></p>
<p class=3D"MsoNormal">Senior Software Architect<o:p></o:p></p>
<p class=3D"MsoNormal">Sandvine<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
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From nobody Fri Oct 31 14:12:48 2014
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This draft, and maybe the NSH protocol draft, seem like the place to 
raise a question that was pointed out to me.

In the architecture, we permit SFs to trigger reclassification, if a 
classifier is present at the SFF.
We also permit the same SFF to be supporting several SFs.

We could easily have the case where an SFF has a classifier to support 
those SFs (like security appliances) which need to be able to trigger 
reclassification.  But many SFs should not trigger reclassification. 
While the protocol can not tell this, the administrator / operator can.

Would we improve robustness if we added a flag telling the SFF whether 
to permit a given SF to request reclassification?

Thank you,
Joel

On 10/27/14, 7:59 AM, internet-drafts@ietf.org wrote:
>
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
>
>
>          Title           : Yang Data Model for Service Function Chaining
>          Authors         : Reinaldo Penno
>                            Paul Quinn
> 	Filename        : draft-penno-sfc-yang-09.txt
> 	Pages           : 36
> 	Date            : 2014-10-27
>
> Abstract:
>     This document defines a YANG data model that can be used to configure
>     and manage Service Function Chains.
>


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From: "Reinaldo Penno (repenno)" <repenno@cisco.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>, "draft-penno-sfc-yang@tools.ietf.org" <draft-penno-sfc-yang@tools.ietf.org>, "sfc@ietf.org" <sfc@ietf.org>
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By =B3trigger=B2 you mean that SF uses method such as a bit in the NSH head=
er
to convey the need for reclassification? I know some transformation
services could require that on a per packet basis.

Another possibility is that there is always a need for reclassification
after a certain SF (example, tunnel termination). Not the VXLAN transport
tunnel, but something like a Softwire tunnel.



On 10/31/14, 2:12 PM, "Joel M. Halpern" <jmh@joelhalpern.com> wrote:

>This draft, and maybe the NSH protocol draft, seem like the place to
>raise a question that was pointed out to me.
>
>In the architecture, we permit SFs to trigger reclassification, if a
>classifier is present at the SFF.
>We also permit the same SFF to be supporting several SFs.
>
>We could easily have the case where an SFF has a classifier to support
>those SFs (like security appliances) which need to be able to trigger
>reclassification.  But many SFs should not trigger reclassification.
>While the protocol can not tell this, the administrator / operator can.
>
>Would we improve robustness if we added a flag telling the SFF whether
>to permit a given SF to request reclassification?
>
>Thank you,
>Joel
>
>On 10/27/14, 7:59 AM, internet-drafts@ietf.org wrote:
>>
>> A New Internet-Draft is available from the on-line Internet-Drafts
>>directories.
>>
>>
>>          Title           : Yang Data Model for Service Function Chaining
>>          Authors         : Reinaldo Penno
>>                            Paul Quinn
>> 	Filename        : draft-penno-sfc-yang-09.txt
>> 	Pages           : 36
>> 	Date            : 2014-10-27
>>
>> Abstract:
>>     This document defines a YANG data model that can be used to
>>configure
>>     and manage Service Function Chains.
>>


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Subject: Re: [sfc] I-D Action: draft-penno-sfc-yang-09.txt
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The former case is what was discussed earlier in the SFC work.  The 
example proposed was a security SF.  Normally, it says yes, and the 
packet goes merrily on its way.  If it says no, the SF needs to add 
metadata and tell the SFF that reclassification is needed.

Yours,
Joel

On 10/31/14, 6:10 PM, Reinaldo Penno (repenno) wrote:
> By ³trigger² you mean that SF uses method such as a bit in the NSH header
> to convey the need for reclassification? I know some transformation
> services could require that on a per packet basis.
>
> Another possibility is that there is always a need for reclassification
> after a certain SF (example, tunnel termination). Not the VXLAN transport
> tunnel, but something like a Softwire tunnel.
>
>
>
> On 10/31/14, 2:12 PM, "Joel M. Halpern" <jmh@joelhalpern.com> wrote:
>
>> This draft, and maybe the NSH protocol draft, seem like the place to
>> raise a question that was pointed out to me.
>>
>> In the architecture, we permit SFs to trigger reclassification, if a
>> classifier is present at the SFF.
>> We also permit the same SFF to be supporting several SFs.
>>
>> We could easily have the case where an SFF has a classifier to support
>> those SFs (like security appliances) which need to be able to trigger
>> reclassification.  But many SFs should not trigger reclassification.
>> While the protocol can not tell this, the administrator / operator can.
>>
>> Would we improve robustness if we added a flag telling the SFF whether
>> to permit a given SF to request reclassification?
>>
>> Thank you,
>> Joel
>>
>> On 10/27/14, 7:59 AM, internet-drafts@ietf.org wrote:
>>>
>>> A New Internet-Draft is available from the on-line Internet-Drafts
>>> directories.
>>>
>>>
>>>           Title           : Yang Data Model for Service Function Chaining
>>>           Authors         : Reinaldo Penno
>>>                             Paul Quinn
>>> 	Filename        : draft-penno-sfc-yang-09.txt
>>> 	Pages           : 36
>>> 	Date            : 2014-10-27
>>>
>>> Abstract:
>>>      This document defines a YANG data model that can be used to
>>> configure
>>>      and manage Service Function Chains.
>>>
>


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From: "Reinaldo Penno (repenno)" <repenno@cisco.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>, "draft-penno-sfc-yang@tools.ietf.org" <draft-penno-sfc-yang@tools.ietf.org>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: I-D Action: draft-penno-sfc-yang-09.txt
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Date: Fri, 31 Oct 2014 22:33:40 +0000
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References: <20141027115902.1947.78145.idtracker@ietfa.amsl.com> <5453FB36.5040405@joelhalpern.com> <D0795582.5144%repenno@cisco.com> <54540AD7.2010807@joelhalpern.com>
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Subject: Re: [sfc] I-D Action: draft-penno-sfc-yang-09.txt
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From nobody Fri Oct 31 15:50:43 2014
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Subject: Re: [sfc] I-D Action: draft-penno-sfc-yang-09.txt
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My preference would be to drop the packet, and generate a network
management event about a misbehaving SF.  I can live with forwarding the
packet along the original path, presumably without the bit requesting
reclassification.  But not trying to guess what metadata the SF modified.

Yours,
Joel

PS: I would expect the reclassification request to be one of the header
bits in the NSH header.

On 10/31/14, 6:33 PM, Reinaldo Penno (repenno) wrote:
> What is the proposed action if a SF inserts metadata to require
> classification but it is not allowed to do so based on its configuration?
> Drop the packet, send the packet on its merry way, and/or remove metadata,
> etc?
> 
> 
> 
> On 10/31/14, 3:19 PM, "Joel M. Halpern" <jmh@joelhalpern.com> wrote:
> 
>> The former case is what was discussed earlier in the SFC work.  The
>> example proposed was a security SF.  Normally, it says yes, and the
>> packet goes merrily on its way.  If it says no, the SF needs to add
>> metadata and tell the SFF that reclassification is needed.
>>
>> Yours,
>> Joel
>>
>> On 10/31/14, 6:10 PM, Reinaldo Penno (repenno) wrote:
>>> By ©øtrigger©÷ you mean that SF uses method such as a bit in the NSH
>>> header
>>> to convey the need for reclassification? I know some transformation
>>> services could require that on a per packet basis.
>>>
>>> Another possibility is that there is always a need for reclassification
>>> after a certain SF (example, tunnel termination). Not the VXLAN
>>> transport
>>> tunnel, but something like a Softwire tunnel.
>>>
>>>
>>>
>>> On 10/31/14, 2:12 PM, "Joel M. Halpern" <jmh@joelhalpern.com> wrote:
>>>
>>>> This draft, and maybe the NSH protocol draft, seem like the place to
>>>> raise a question that was pointed out to me.
>>>>
>>>> In the architecture, we permit SFs to trigger reclassification, if a
>>>> classifier is present at the SFF.
>>>> We also permit the same SFF to be supporting several SFs.
>>>>
>>>> We could easily have the case where an SFF has a classifier to support
>>>> those SFs (like security appliances) which need to be able to trigger
>>>> reclassification.  But many SFs should not trigger reclassification.
>>>> While the protocol can not tell this, the administrator / operator can.
>>>>
>>>> Would we improve robustness if we added a flag telling the SFF whether
>>>> to permit a given SF to request reclassification?
>>>>
>>>> Thank you,
>>>> Joel
>>>>
>>>> On 10/27/14, 7:59 AM, internet-drafts@ietf.org wrote:
>>>>>
>>>>> A New Internet-Draft is available from the on-line Internet-Drafts
>>>>> directories.
>>>>>
>>>>>
>>>>>            Title           : Yang Data Model for Service Function
>>>>> Chaining
>>>>>            Authors         : Reinaldo Penno
>>>>>                              Paul Quinn
>>>>> 	Filename        : draft-penno-sfc-yang-09.txt
>>>>> 	Pages           : 36
>>>>> 	Date            : 2014-10-27
>>>>>
>>>>> Abstract:
>>>>>       This document defines a YANG data model that can be used to
>>>>> configure
>>>>>       and manage Service Function Chains.
>>>>>
>>>
> 


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From: "Reinaldo Penno (repenno)" <repenno@cisco.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>, "draft-penno-sfc-yang@tools.ietf.org" <draft-penno-sfc-yang@tools.ietf.org>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: I-D Action: draft-penno-sfc-yang-09.txt
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Date: Fri, 31 Oct 2014 22:58:49 +0000
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References: <20141027115902.1947.78145.idtracker@ietfa.amsl.com> <5453FB36.5040405@joelhalpern.com> <D0795582.5144%repenno@cisco.com> <54540AD7.2010807@joelhalpern.com> <D0795BF9.515A%repenno@cisco.com> <54541234.20907@joelhalpern.com>
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Subject: Re: [sfc] I-D Action: draft-penno-sfc-yang-09.txt
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