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To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, "Paul Quinn (paulq)" <paulq@cisco.com>
Thread-Topic: [sfc] WG review for draft-ietf-sfc-nsh-07.txt
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To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, "Paul Quinn (paulq)" <paulq@cisco.com>
Thread-Topic: [sfc] WG review for draft-ietf-sfc-nsh-07.txt
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From: Alia Atlas <akatlas@gmail.com>
Date: Wed, 5 Oct 2016 13:51:59 -0400
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Subject: [sfc] early AD review of draft-ietf-sfc-nsh-10
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--f403045da5ea7f57de053e21d587
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As requested by the WG Chairs, I have done an early AD review of
draft-ietf-sfc-nsh-10.    First, I would like to thank the editors, Paul
and Uri, and those who provided text in the discussions.  This document has
improved significantly.

Below are my review comments.  There are still a number of minor things to
clean up or discuss.


Minor:
a) In Sec 3.2, it says "MD Type: indicates the format of NSH beyond the
mandatory Base Header

   and the Service Path Header.  MD Type defines the format of the
   metadata being carried.  Please see IANA Considerations section
   below.

   NSH defines two MD types:

   0x1 - which indicates that the format of the header includes fixed
   length context headers (see Figure 4 below).

   0x2 - which does not mandate any headers beyond the Base Header and
   Service Path Header, but may contain optional variable length context
   information."

   This is an 8-bit field and from the IANA considerations appears to be
intended to be an integer.   This implies that it isn't possible for an NSH
packet to have both the fixed length context headers and the TLV context
information.    Why is that the case?  Since the MD Type 1 is MTI, it seems
to provide an excellent way of ensuring that information can be understood
by every entity, and then TLV information could be used for additional
information to be passed along.

Is there a reason or a conversation when this approach was ruled out?

b) Sec 3.2:  The Next Protocol field defines different values for IPv4 and
IPv6.  Why isn't there simply a value for IP that the enclosed IP packet
can then self-identify as to its version?    Separately, can you please
name the Next Protocol field to either something that indicates what types
of next protocol might be carried or at least a less generic name so that
intelligent reuse is possible?

c) Sec 12.2.5:  I am concerned about all values in the NSH Base Header Next
Protocol field being "Standards Action".   Any new encapsulation now will
have to get allocations from potentially EtherType, NSH Next Protocol, IP
Next Protocol, and possibly more if the NSH Next Protocol field isn't
reused.  I would strongly recommend at least having part of the range
available for Specification Required which will also require guidance to be
provided for an expert reviewer.

d) Sec 3.3:  "Service Index MUST be decremented by Service Functions or by
SFC Proxy nodes after performing required services and the new
   decremented SI value MUST be used in the egress NSH packet."
Is this "decremented by 1"' or "strictly decreasing" or something else?  Is
it possible for the SI along a given SPI to ever increase (for instance for
an intentional loop)?  Please clarify.
   This same issue appears in Sec 4 bullet 3.

e) Sec 8.2:  Is there a reason that removal of metadata isn't mentioned?
Presumably, an SF can remove a piece of metadata if it is no longer needed
by the SFP for the remainder of the processing?

f) Sec 9:   "Further, as  described in [section 8.1], operators can and
should use indirect
   identification for personally identifying information, thus
   significantly mitigating the risk of privacy violation."
The reference of Section 8.1 doesn't describe this.  Can you please update
the reference?

g) Sec 12.1:  I continue to be concerned about the reuse of an EtherType
that was allocated initially for another purpose.  Has the IEEE ok'd this
and assigned ownership to the IETF?

h) Sec 12.2.3:  The description for MD Type 1 and MD Type 2 should be more
accurate and not the same!  "Indicates fixed metadata attached" and
"Indicates TLV metadata may be attached"' or something similar.

i)Sec 12.2.4 MD Class Registry:  This defines Expert Review for a range but
provides no guidance to the expert on how to evaluate or make decisions.
That is needed.  Given the need to potentially understand the different
meanings of the meta-data, I think that Specification Required would be
preferable to Expert Review.


Regards,
Alia

--f403045da5ea7f57de053e21d587
Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr"><div>As requested by the WG Chairs, I have done an early A=
D review of draft-ietf-sfc-nsh-10. =C2=A0 =C2=A0First, I would like to than=
k the editors, Paul and Uri, and those who provided text in the discussions=
.=C2=A0 This document has improved significantly.</div><div><br></div><div>=
Below are my review comments.=C2=A0 There are still a number of minor thing=
s to clean up or discuss.</div><div><br></div><div><br></div><div>Minor:</d=
iv><div>a) In Sec 3.2, it says=C2=A0&quot;MD Type: indicates the format of =
NSH beyond the mandatory Base Header<br><br>=C2=A0 =C2=A0and the Service Pa=
th Header.=C2=A0 MD Type defines the format of the<br>=C2=A0 =C2=A0metadata=
 being carried.=C2=A0 Please see IANA Considerations section<br>=C2=A0 =C2=
=A0below.<br><br>=C2=A0 =C2=A0NSH defines two MD types:<br><br>=C2=A0 =C2=
=A00x1 - which indicates that the format of the header includes fixed<br>=
=C2=A0 =C2=A0length context headers (see Figure 4 below).<br><br>=C2=A0 =C2=
=A00x2 - which does not mandate any headers beyond the Base Header and<br>=
=C2=A0 =C2=A0Service Path Header, but may contain optional variable length =
context<br>=C2=A0 =C2=A0information.&quot;</div><div><br></div><div>=C2=A0 =
=C2=A0This is an 8-bit field and from the IANA considerations appears to be=
 intended to be an integer. =C2=A0 This implies that it isn&#39;t possible =
for an NSH packet to have both the fixed length context headers and the TLV=
 context information. =C2=A0 =C2=A0Why is that the case?=C2=A0 Since the MD=
 Type 1 is MTI, it seems to provide an excellent way of ensuring that infor=
mation can be understood by every entity, and then TLV information could be=
 used for additional information to be passed along.</div><div><br></div><d=
iv>Is there a reason or a conversation when this approach was ruled out?</d=
iv><div><br></div><div>b) Sec 3.2: =C2=A0The Next Protocol field defines di=
fferent values for IPv4 and IPv6.=C2=A0 Why isn&#39;t there simply a value =
for IP that the enclosed IP packet can then self-identify as to its version=
? =C2=A0 =C2=A0Separately, can you please name the Next Protocol field to e=
ither something that indicates what types of next protocol might be carried=
 or at least a less generic name so that intelligent reuse is possible?</di=
v><div><br></div><div>c) Sec 12.2.5: =C2=A0I am concerned about all values =
in the NSH Base Header Next Protocol field being &quot;Standards Action&quo=
t;. =C2=A0 Any new encapsulation now will have to get allocations from pote=
ntially EtherType, NSH Next Protocol, IP Next Protocol, and possibly more i=
f the NSH Next Protocol field isn&#39;t reused.=C2=A0 I would strongly reco=
mmend at least having part of the range available for Specification Require=
d which will also require guidance to be provided for an expert reviewer.</=
div><div><br></div><div>d) Sec 3.3: =C2=A0&quot;Service Index MUST be decre=
mented by Service Functions or by SFC=C2=A0Proxy nodes after performing req=
uired services and the new<br>=C2=A0 =C2=A0decremented SI value MUST be use=
d in the egress NSH packet.&quot;<br>Is this &quot;decremented by 1&quot;&#=
39; or &quot;strictly decreasing&quot; or something else?=C2=A0 Is it possi=
ble for the SI along a given SPI to ever increase (for instance for an inte=
ntional loop)?=C2=A0 Please clarify.</div><div>=C2=A0 =C2=A0This same issue=
 appears in Sec 4 bullet 3.</div><div><br></div><div><div>e) Sec 8.2: =C2=
=A0Is there a reason that removal of metadata isn&#39;t mentioned?=C2=A0 Pr=
esumably, an SF can remove a piece of metadata if it is no longer needed by=
 the SFP for the remainder of the processing?=C2=A0</div><div><br></div><di=
v>f) Sec 9: =C2=A0=C2=A0&quot;Further, as=C2=A0 described in [section 8.1],=
 operators can and should use indirect<br>=C2=A0 =C2=A0identification for p=
ersonally identifying information, thus<br>=C2=A0 =C2=A0significantly mitig=
ating the risk of privacy violation.&quot;</div><div>The reference of Secti=
on 8.1 doesn&#39;t describe this.=C2=A0 Can you please update the reference=
?</div><div><br></div><div>g) Sec 12.1: =C2=A0I continue to be concerned ab=
out the reuse of an EtherType that was allocated initially for another purp=
ose.=C2=A0 Has the IEEE ok&#39;d this and assigned ownership to the IETF?</=
div><div><br></div><div>h) Sec 12.2.3: =C2=A0The description for MD Type 1 =
and MD Type 2 should be more accurate and not the same! =C2=A0&quot;Indicat=
es fixed metadata attached&quot; and &quot;Indicates TLV metadata may be at=
tached&quot;&#39; or something similar.</div><div><br></div><div>i)Sec 12.2=
.4=C2=A0MD Class Registry: =C2=A0This defines Expert Review for a range but=
 provides no guidance to the expert on how to evaluate or make decisions.=
=C2=A0 That is needed.=C2=A0 Given the need to potentially understand the d=
ifferent meanings of the meta-data, I think that Specification Required wou=
ld be preferable to Expert Review.</div><div><br></div><div><br></div><div>=
Regards,</div><div>Alia</div><div><br></div><div><br></div><div><br></div><=
div><br></div></div></div>

--f403045da5ea7f57de053e21d587--


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To: sfc@ietf.org
From: Martin Stiemerling <mls.ietf@gmail.com>
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Date: Fri, 7 Oct 2016 13:34:13 +0200
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Subject: [sfc] Announcement: Oct 14th -- virtual interim about Security and Metadata
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Hi all,

The virtual interim of the SFC WG will be held on Oct 14th.

Time-wise we will start at 10am EST which is
- 10 pm Beijing
- 4 pm Central Europe
- 7 am US east coast.

We have planned for 2 hours of meeting time and we will use Webex to run 
the meeting.

The draft agenda:
0) Administrativa
1) Agenda bashing
2) SFC security
3) Metadata

Let us chairs know if you have change requests for the agenda.

Thanks,

   Martin


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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Martin Stiemerling <mls.ietf@gmail.com>
Thread-Topic: [sfc] Announcement: Oct 14th -- virtual interim about Security and	Metadata
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Fri, 7 Oct 2016 06:14:01 -0700
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Subject: Re: [sfc] Announcement: Oct 14th -- virtual interim about Security and Metadata
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Hi Martin and Carlos,
LIME WG has scheduled its interim meeting for Friday, October 14 @ 7:00 AM
PST. Would be great if we can avoid the conflict as some are working in
both.

Regards, Greg

On Fri, Oct 7, 2016 at 5:13 AM, Carlos Pignataro (cpignata) <
cpignata@cisco.com> wrote:

>
> > On Oct 7, 2016, at 7:34 AM, Martin Stiemerling <mls.ietf@gmail.com>
> wrote:
> >
> > Hi all,
> >
> > The virtual interim of the SFC WG will be held on Oct 14th.
> >
> > Time-wise we will start at 10am EST which is
> > - 10 pm Beijing
> > - 4 pm Central Europe
> > - 7 am US east coast.
>
> I think you meant 10am EDT (not EST), and 7am US West Coast (not East
> Coast).
>
> Thanks,
>
> =E2=80=94 Carlos.
>
> >
> > We have planned for 2 hours of meeting time and we will use Webex to ru=
n
> the meeting.
> >
> > The draft agenda:
> > 0) Administrativa
> > 1) Agenda bashing
> > 2) SFC security
> > 3) Metadata
> >
> > Let us chairs know if you have change requests for the agenda.
> >
> > Thanks,
> >
> >  Martin
> >
> > _______________________________________________
> > sfc mailing list
> > sfc@ietf.org
> > https://www.ietf.org/mailman/listinfo/sfc
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
>

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<div dir=3D"ltr">Hi Martin and Carlos,<div>LIME WG has scheduled its interi=
m meeting for Friday, October 14 @ 7:00 AM PST. Would be great if we can av=
oid the conflict as some are working in both.</div><div><br></div><div>Rega=
rds, Greg</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quo=
te">On Fri, Oct 7, 2016 at 5:13 AM, Carlos Pignataro (cpignata) <span dir=
=3D"ltr">&lt;<a href=3D"mailto:cpignata@cisco.com" target=3D"_blank">cpigna=
ta@cisco.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span =
class=3D""><br>
&gt; On Oct 7, 2016, at 7:34 AM, Martin Stiemerling &lt;<a href=3D"mailto:m=
ls.ietf@gmail.com">mls.ietf@gmail.com</a>&gt; wrote:<br>
&gt;<br>
&gt; Hi all,<br>
&gt;<br>
&gt; The virtual interim of the SFC WG will be held on Oct 14th.<br>
&gt;<br>
&gt; Time-wise we will start at 10am EST which is<br>
&gt; - 10 pm Beijing<br>
&gt; - 4 pm Central Europe<br>
&gt; - 7 am US east coast.<br>
<br>
</span>I think you meant 10am EDT (not EST), and 7am US West Coast (not Eas=
t Coast).<br>
<br>
Thanks,<br>
<br>
=E2=80=94 Carlos.<br>
<div class=3D"HOEnZb"><div class=3D"h5"><br>
&gt;<br>
&gt; We have planned for 2 hours of meeting time and we will use Webex to r=
un the meeting.<br>
&gt;<br>
&gt; The draft agenda:<br>
&gt; 0) Administrativa<br>
&gt; 1) Agenda bashing<br>
&gt; 2) SFC security<br>
&gt; 3) Metadata<br>
&gt;<br>
&gt; Let us chairs know if you have change requests for the agenda.<br>
&gt;<br>
&gt; Thanks,<br>
&gt;<br>
&gt;=C2=A0 Martin<br>
&gt;<br>
&gt; ______________________________<wbr>_________________<br>
&gt; sfc mailing list<br>
&gt; <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/sfc" rel=3D"noreferre=
r" target=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/sfc</a><br>
<br>
______________________________<wbr>_________________<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" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/sfc</a><br>
</div></div></blockquote></div><br></div>

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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Greg Mirsky <gregimirsky@gmail.com>
Thread-Topic: [sfc] Announcement: Oct 14th -- virtual interim about Security and Metadata
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The Service Function Chaining (sfc) Working Group will hold
a virtual interim meeting on 2016-10-14 from 10:00 to 12:00 US/Eastern.

The meeting will start at 10am US east coast, which is
- 10 pm Beijing
- 4 pm Central Europe
- 7 am US west coast

Agenda:
The draft agenda:
0) Administrativa
1) Agenda bashing
2) SFC security
3) Metadata

Let the chairs know if you have change requests for the agenda.

Information about remote participation:
WebEx information will be distributed on the SFC WG mailing list.



From nobody Wed Oct 12 20:49:35 2016
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From: Xuxiaohu <xuxiaohu@huawei.com>
To: "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: How to indicate the existence of an explicit protocol field immediately after the MPLS label stack?
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Date: Thu, 13 Oct 2016 03:49:14 +0000
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Subject: [sfc] How to indicate the existence of an explicit protocol field immediately after the MPLS label stack?
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Hi all,

It's well-known that the MPLS label stack has no EXPLICIT protocol identifi=
er field to indicate the protocol type of the MPLS payload. However, the fi=
rst nibble of the MPLS payload has actually been used as an implicit protoc=
ol identifier for some payloads, such as IPv4 (0100), IPv6(0110) and MPLS-B=
IER (0101, for more details, please see https://tools.ietf.org/html/draft-i=
etf-bier-mpls-encapsulation-05#page-5). Unfortunately, the first nibble spa=
ce is not enough for the sustainable development of new encapsulation heade=
rs which may happen to be encapsulated with an MPLS header. Furthermore, th=
e remaining first nibble space available for payload indication is only 011=
1 due to the NSH specification (https://tools.ietf.org/html/draft-ietf-sfc-=
nsh-10#page-7) unless the NSH is restricted from being transported directly=
 over the MPLS transport (in this case the NSH is sadly not transport indep=
endent anymore).=20

Hence, it's seem necessary for us to consider the approach of inserting an =
EXPLICIT protocol identifier field within the MPLS packet as early as possi=
ble. The following are two possible ways of inserting an EXPLICIT protocol =
identifier field within the MPLS packet:

One is to use an SPL (or even ESPL) as described (https://tools.ietf.org/ht=
ml/draft-xu-mpls-payload-protocol-identifier-01). See the following figure:

     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                 PIL                   | EXP |1|      TTL      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0 0 0 0|       Reserved          |        Protocol Type        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                              Payload                          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Another is to set the first nibble of the 4-octet entry containing the prot=
ocol field to a dedicated value (e.g., 1111), as shown in the following fig=
ure. In this case, there is no need to insert additional label (s) (i.e., S=
PL or ESPL) anymore. The logic of the latter approach is that the first nib=
ble of the MPLS payload has been implicitly used as a protocol id (e.g., in=
 the case where the payload is IPv4 or IPv6 packet), and since the 4-bit (i=
mplicit) protocol id field is not extensible, we introduce a longer (explic=
it) protocol id field as per the approach of ESPL.=20
       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |             Bottom Label              | EXP |1|      TTL      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |0 1 1 1|       Reserved          |        Protocol Type        |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                              Payload                          |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

IMHO, the benefits of introducing an explicit protocol id into the MPLS pac=
ket include but not limited to: 1) provide a sustainable way of indicating =
new MPLS payload types without any need of inserting one additional label i=
ndicating the MPLS payloads (e.g., considering how to transport NSH over MP=
LS networks); 2) there is no need any more for each new encapsulation heade=
r to deal with the notorious first nibble issue associated with MPLS indivi=
dually. More specifically, there is no need to intentionally avoid the firs=
t nibble of each new encapsulation header from being 0100 (IPv4) or 0110 (I=
Pv6).

Any comments and suggestions are welcome.

Best regards,
Xiaohu


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Subject: Re: [sfc] How to indicate the existence of an explicit protocol field immediately after the MPLS label stack?
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Xiaohu and all,

I respectfully disagree with your statement "the first nibble of the MPLS p=
ayload has actually been used as an implicit protocol identifier for some p=
ayloads". In the case of PWs the CW (with this first nibble) may be not pre=
sent at all, but even when it is present, its first nibble is only used for=
 disambiguation of the PW packets (so that they cannot be mistakenly treate=
d as IPv4 or IPv6 packets by the ECMP mechanisms).


My 2c,

Sasha






________________________________
From: mpls <mpls-bounces@ietf.org> on behalf of Xuxiaohu <xuxiaohu@huawei.c=
om>
Sent: Thursday, October 13, 2016 6:49 AM
To: mpls@ietf.org
Cc: bier@ietf.org; sfc@ietf.org
Subject: [mpls] How to indicate the existence of an explicit protocol field=
 immediately after the MPLS label stack?

Hi all,

It's well-known that the MPLS label stack has no EXPLICIT protocol identifi=
er field to indicate the protocol type of the MPLS payload. However, the fi=
rst nibble of the MPLS payload has actually been used as an implicit protoc=
ol identifier for some payloads, such as IPv4 (0100), IPv6(0110) and MPLS-B=
IER (0101, for more details, please see https://tools.ietf.org/html/draft-i=
etf-bier-mpls-encapsulation-05#page-5). Unfortunately, the first nibble spa=
ce is not enough for the sustainable development of new encapsulation heade=
rs which may happen to be encapsulated with an MPLS header. Furthermore, th=
e remaining first nibble space available for payload indication is only 011=
1 due to the NSH specification (https://tools.ietf.org/html/draft-ietf-sfc-=
nsh-10#page-7) unless the NSH is restricted from being transported directly=
 over the MPLS transport (in this case the NSH is sadly not transport indep=
endent anymore).

Hence, it's seem necessary for us to consider the approach of inserting an =
EXPLICIT protocol identifier field within the MPLS packet as early as possi=
ble. The following are two possible ways of inserting an EXPLICIT protocol =
identifier field within the MPLS packet:

One is to use an SPL (or even ESPL) as described (https://tools.ietf.org/ht=
ml/draft-xu-mpls-payload-protocol-identifier-01). See the following figure:

     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                 PIL                   | EXP |1|      TTL      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0 0 0 0|       Reserved          |        Protocol Type        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                              Payload                          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Another is to set the first nibble of the 4-octet entry containing the prot=
ocol field to a dedicated value (e.g., 1111), as shown in the following fig=
ure. In this case, there is no need to insert additional label (s) (i.e., S=
PL or ESPL) anymore. The logic of the latter approach is that the first nib=
ble of the MPLS payload has been implicitly used as a protocol id (e.g., in=
 the case where the payload is IPv4 or IPv6 packet), and since the 4-bit (i=
mplicit) protocol id field is not extensible, we introduce a longer (explic=
it) protocol id field as per the approach of ESPL.
       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |             Bottom Label              | EXP |1|      TTL      |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |0 1 1 1|       Reserved          |        Protocol Type        |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                              Payload                          |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

IMHO, the benefits of introducing an explicit protocol id into the MPLS pac=
ket include but not limited to: 1) provide a sustainable way of indicating =
new MPLS payload types without any need of inserting one additional label i=
ndicating the MPLS payloads (e.g., considering how to transport NSH over MP=
LS networks); 2) there is no need any more for each new encapsulation heade=
r to deal with the notorious first nibble issue associated with MPLS indivi=
dually. More specifically, there is no need to intentionally avoid the firs=
t nibble of each new encapsulation header from being 0100 (IPv4) or 0110 (I=
Pv6).

Any comments and suggestions are welcome.

Best regards,
Xiaohu

_______________________________________________
mpls mailing list
mpls@ietf.org
https://www.ietf.org/mailman/listinfo/mpls
mpls Info Page - Internet Engineering Task Force<https://www.ietf.org/mailm=
an/listinfo/mpls>
www.ietf.org
For information about the MPLS working group, see http://www.ietf.org/html.=
charters/mpls-charter.html. To see the collection of prior postings to the =
list, visit ...




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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:0;margi=
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</head>
<body dir=3D"ltr">
<div id=3D"divtagdefaultwrapper" style=3D"font-size:12pt;color:#000000;font=
-family:'Times New Roman', Times, serif;">
<p><span style=3D"color: rgb(33, 33, 33); font-size: 13.3333px;">Xiaohu and=
 all,</span><br>
</p>
<p><span style=3D"color: rgb(33, 33, 33); font-size: 13.3333px;">I respectf=
ully disagree with your statement &quot;<span style=3D"font-family: &quot;T=
imes New Roman&quot;, Times, serif, &quot;Apple Color Emoji&quot;, &quot;Se=
goe UI Emoji&quot;, NotoColorEmoji, &quot;Segoe UI Symbol&quot;, &quot;Andr=
oid Emoji&quot;, EmojiSymbols; font-size: 13.3333px;"><b><i><span style=3D"=
background-color: rgb(255, 255, 0);">the
 first nibble of the MPLS payload has actually been used as an implicit pro=
tocol identifier for some payloads</span></i></b></span>&quot;. In the case=
 of PWs the CW (with this first nibble) may be not present at all, but even=
 when it is present, its first nibble
 is only used for disambiguation of the PW packets (so that they cannot be =
mistakenly treated as IPv4 or IPv6 packets by the ECMP mechanisms).</span><=
/p>
<p><span style=3D"color: rgb(33, 33, 33); font-size: 13.3333px;"><br>
</span></p>
<p><span style=3D"color: rgb(33, 33, 33); font-size: 13.3333px;">My 2c,</sp=
an></p>
<p><span style=3D"color: rgb(33, 33, 33); font-size: 13.3333px;">Sasha</spa=
n></p>
<p><span style=3D"color: rgb(33, 33, 33); font-size: 13.3333px;"><br>
</span></p>
<p><span style=3D"color: rgb(33, 33, 33); font-size: 13.3333px;"><br>
</span></p>
<p><span style=3D"color: rgb(33, 33, 33); font-size: 13.3333px;"><br>
</span></p>
<p><span style=3D"color: rgb(33, 33, 33); font-size: 13.3333px;"><br>
</span></p>
<br>
<br>
<div style=3D"color: rgb(0, 0, 0);">
<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> mpls &lt;mpls-bounc=
es@ietf.org&gt; on behalf of Xuxiaohu &lt;xuxiaohu@huawei.com&gt;<br>
<b>Sent:</b> Thursday, October 13, 2016 6:49 AM<br>
<b>To:</b> mpls@ietf.org<br>
<b>Cc:</b> bier@ietf.org; sfc@ietf.org<br>
<b>Subject:</b> [mpls] How to indicate the existence of an explicit protoco=
l field immediately after the MPLS label stack?</font>
<div>&nbsp;</div>
</div>
</div>
<font size=3D"2"><span style=3D"font-size:10pt;">
<div class=3D"PlainText">Hi all,<br>
<br>
It's well-known that the MPLS label stack has no EXPLICIT protocol identifi=
er field to indicate the protocol type of the MPLS payload. However, the fi=
rst nibble of the MPLS payload has actually been used as an implicit protoc=
ol identifier for some payloads,
 such as IPv4 (0100), IPv6(0110) and MPLS-BIER (0101, for more details, ple=
ase see
<a href=3D"https://tools.ietf.org/html/draft-ietf-bier-mpls-encapsulation-0=
5#page-5" id=3D"LPlnk95281" previewremoved=3D"true">
https://tools.ietf.org/html/draft-ietf-bier-mpls-encapsulation-05#page-5</a=
>). Unfortunately, the first nibble space is not enough for the sustainable=
 development of new encapsulation headers which may happen to be encapsulat=
ed with an MPLS header. Furthermore,
 the remaining first nibble space available for payload indication is only =
0111 due to the NSH specification (<a href=3D"https://tools.ietf.org/html/d=
raft-ietf-sfc-nsh-10#page-7" id=3D"LPlnk148596" previewremoved=3D"true">htt=
ps://tools.ietf.org/html/draft-ietf-sfc-nsh-10#page-7</a>)
 unless the NSH is restricted from being transported directly over the MPLS=
 transport (in this case the NSH is sadly not transport independent anymore=
).
<br>
<br>
Hence, it's seem necessary for us to consider the approach of inserting an =
EXPLICIT protocol identifier field within the MPLS packet as early as possi=
ble. The following are two possible ways of inserting an EXPLICIT protocol =
identifier field within the MPLS
 packet:<br>
<br>
One is to use an SPL (or even ESPL) as described (<a href=3D"https://tools.=
ietf.org/html/draft-xu-mpls-payload-protocol-identifier-01" id=3D"LPlnk8204=
64" previewremoved=3D"true">https://tools.ietf.org/html/draft-xu-mpls-paylo=
ad-protocol-identifier-01</a>). See the
 following figure:<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3<br>
&nbsp;&nbsp;&nbsp;&nbsp; 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 =
5 6 7 8 9 0 1<br>
&nbsp;&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#=
43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;=
-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<br=
>
&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; PIL&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; | EXP |1|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; TTL&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp; |<br>
&nbsp;&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#=
43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;=
-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<br=
>
&nbsp;&nbsp;&nbsp;&nbsp; |0 0 0 0|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Rese=
rved&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp; Protocol Type&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp; |<br>
&nbsp;&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#=
43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;=
-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<br=
>
&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;&nbsp;&nbsp; Payload&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; |<br>
&nbsp;&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#=
43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;=
-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<br=
>
<br>
Another is to set the first nibble of the 4-octet entry containing the prot=
ocol field to a dedicated value (e.g., 1111), as shown in the following fig=
ure. In this case, there is no need to insert additional label (s) (i.e., S=
PL or ESPL) anymore. The logic of
 the latter approach is that the first nibble of the MPLS payload has been =
implicitly used as a protocol id (e.g., in the case where the payload is IP=
v4 or IPv6 packet), and since the 4-bit (implicit) protocol id field is not=
 extensible, we introduce a longer
 (explicit) protocol id field as per the approach of ESPL. <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 =
9 0 1 2 3 4 5 6 7 8 9 0 1<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#=
43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;=
-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#=
43;-&#43;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Bottom Label&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | EXP |1|&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; TTL&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#=
43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;=
-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#=
43;-&#43;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |0 1 1 1|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp; Reserved&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Protocol Type&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; |<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#=
43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;=
-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#=
43;-&#43;<br>
&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;&nbsp;&nbsp;&nbsp;&nbsp; Payload&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; |<br=
>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#=
43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;=
-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#=
43;-&#43;<br>
<br>
IMHO, the benefits of introducing an explicit protocol id into the MPLS pac=
ket include but not limited to: 1) provide a sustainable way of indicating =
new MPLS payload types without any need of inserting one additional label i=
ndicating the MPLS payloads (e.g.,
 considering how to transport NSH over MPLS networks); 2) there is no need =
any more for each new encapsulation header to deal with the notorious first=
 nibble issue associated with MPLS individually. More specifically, there i=
s no need to intentionally avoid
 the first nibble of each new encapsulation header from being 0100 (IPv4) o=
r 0110 (IPv6).<br>
<br>
Any comments and suggestions are welcome.<br>
<br>
Best regards,<br>
Xiaohu<br>
<br>
_______________________________________________<br>
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References: <7bdb0474-8be0-00a6-f2de-fdefedfc847b@gmail.com> <0B4F382D-34B0-45FB-B4FA-E2D2F67A840D@cisco.com>
From: Martin Stiemerling <mls.ietf@gmail.com>
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Subject: Re: [sfc] Announcement: Oct 14th -- virtual interim about Security and Metadata
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Am 07.10.16 um 14:13 schrieb Carlos Pignataro (cpignata):
>
>> On Oct 7, 2016, at 7:34 AM, Martin Stiemerling <mls.ietf@gmail.com> wrote:
>>
>> Hi all,
>>
>> The virtual interim of the SFC WG will be held on Oct 14th.
>>
>> Time-wise we will start at 10am EST which is
>> - 10 pm Beijing
>> - 4 pm Central Europe
>> - 7 am US east coast.
>
> I think you meant 10am EDT (not EST), and 7am US West Coast (not East Coast).

Yes, indeed, typos on my side.

Thanks,

   Martin

>
> Thanks,
>
> â€” Carlos.
>
>>
>> We have planned for 2 hours of meeting time and we will use Webex to run the meeting.
>>
>> The draft agenda:
>> 0) Administrativa
>> 1) Agenda bashing
>> 2) SFC security
>> 3) Metadata
>>
>> Let us chairs know if you have change requests for the agenda.
>>
>> Thanks,
>>
>>  Martin
>>
>> _______________________________________________
>> sfc mailing list
>> sfc@ietf.org
>> https://www.ietf.org/mailman/listinfo/sfc
>


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To: Greg Mirsky <gregimirsky@gmail.com>, "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
References: <7bdb0474-8be0-00a6-f2de-fdefedfc847b@gmail.com> <0B4F382D-34B0-45FB-B4FA-E2D2F67A840D@cisco.com> <CA+RyBmVsaXScgjSC4Y-9kcMG+k2rvOw1qQT4A83noPUe+bj+3w@mail.gmail.com>
From: Martin Stiemerling <mls.ietf@gmail.com>
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Subject: Re: [sfc] Announcement: Oct 14th -- virtual interim about Security and Metadata
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Hi Greg,

We did run the doodle call before announcing the date and had to pick 
this Friday. It turned out that the majority of people in the doodle can 
male it this Friday.

   Martin

Am 07.10.16 um 15:14 schrieb Greg Mirsky:
> Hi Martin and Carlos,
> LIME WG has scheduled its interim meeting for Friday, October 14 @ 7:00
> AM PST. Would be great if we can avoid the conflict as some are working
> in both.
>
> Regards, Greg
>
> On Fri, Oct 7, 2016 at 5:13 AM, Carlos Pignataro (cpignata)
> <cpignata@cisco.com <mailto:cpignata@cisco.com>> wrote:
>
>
>     > On Oct 7, 2016, at 7:34 AM, Martin Stiemerling <mls.ietf@gmail.com <mailto:mls.ietf@gmail.com>> wrote:
>     >
>     > Hi all,
>     >
>     > The virtual interim of the SFC WG will be held on Oct 14th.
>     >
>     > Time-wise we will start at 10am EST which is
>     > - 10 pm Beijing
>     > - 4 pm Central Europe
>     > - 7 am US east coast.
>
>     I think you meant 10am EDT (not EST), and 7am US West Coast (not
>     East Coast).
>
>     Thanks,
>
>     â€” Carlos.
>
>     >
>     > We have planned for 2 hours of meeting time and we will use Webex
>     to run the meeting.
>     >
>     > The draft agenda:
>     > 0) Administrativa
>     > 1) Agenda bashing
>     > 2) SFC security
>     > 3) Metadata
>     >
>     > Let us chairs know if you have change requests for the agenda.
>     >
>     > Thanks,
>     >
>     >  Martin
>     >
>     > _______________________________________________
>     > sfc mailing list
>     > sfc@ietf.org <mailto:sfc@ietf.org>
>     > https://www.ietf.org/mailman/listinfo/sfc
>     <https://www.ietf.org/mailman/listinfo/sfc>
>
>     _______________________________________________
>     sfc mailing list
>     sfc@ietf.org <mailto:sfc@ietf.org>
>     https://www.ietf.org/mailman/listinfo/sfc
>     <https://www.ietf.org/mailman/listinfo/sfc>
>
>


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To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, Greg Mirsky <gregimirsky@gmail.com>
References: <7bdb0474-8be0-00a6-f2de-fdefedfc847b@gmail.com> <0B4F382D-34B0-45FB-B4FA-E2D2F67A840D@cisco.com> <CA+RyBmVsaXScgjSC4Y-9kcMG+k2rvOw1qQT4A83noPUe+bj+3w@mail.gmail.com> <447B7895-26F8-4AD5-ADBF-7A3D7D8F8946@cisco.com>
From: Martin Stiemerling <mls.ietf@gmail.com>
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Subject: Re: [sfc] Announcement: Oct 14th -- virtual interim about Security and Metadata
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Am 07.10.16 um 15:24 schrieb Carlos Pignataro (cpignata):
> Hi, Greg,
>
>
>
> Indeed, Thank you very much for catching this, Greg!
>
> I also realized the conflict just now as I was updating my calendarâ€¦
>
>
>
> The LIME Interims have been announced a few days ago:
>
> https://datatracker.ietf.org/meeting/upcoming
>
> https://datatracker.ietf.org/meeting/interim-2016-lime-03/session/lime
>
> https://datatracker.ietf.org/meeting/interim-2016-lime-04/session/lime
>
>
>
> I do realize from the SFC Doodle poll, that date maximizes participants
> availability, and 10am EDT is a multi-TZ-friendly timeâ€¦ However, for
> LIME, Oct 14^th was the time where doc Editors were availableâ€¦


No idea on how to fix this, unfortunately.

   Martin


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From: Martin Stiemerling <mls.ietf@gmail.com>
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Date: Thu, 13 Oct 2016 10:04:23 +0200
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Subject: Re: [sfc] Service Function Chaining (sfc) WG Virtual Meeting: 2016-10-14
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Hi all,

Please find below the webex information and some more details about the 
agenda. See also below for the correct meeting times!

Meeting number: 647 918 876
Meeting password: 3Y58PsRm
Meeting link:
https://ietf.webex.com/ietf/j.php?MTID=mfeb35ad4ca078ac97665a28cf1c50c5c

Audio connection:
1-877-668-4493 Call-in toll free number (US/Canada)
1-650-479-3208 Call-in toll number (US/Canada)
Access code: 647 918 876

Please not that you can use Skype to dail-in to the toll free number. 
Just as a side note as there is no other toll free dail-in for non-US 
numbers.

The draft agenda:

0) Administrativa
1) Agenda bashing
2) SFC security
  - short review of the updated NSH security considerations
  - technical progress report from the design team
  - way forward
3) Metadata

Thanks,

   Martin

Am 07.10.16 um 21:50 schrieb IESG Secretary:
> The Service Function Chaining (sfc) Working Group will hold
> a virtual interim meeting on 2016-10-14 from 10:00 to 12:00 US/Eastern.
>
> The meeting will start at 10am US east coast, which is
> - 10 pm Beijing
> - 4 pm Central Europe
> - 7 am US west coast
>
> Agenda:
> The draft agenda:
> 0) Administrativa
> 1) Agenda bashing
> 2) SFC security
> 3) Metadata
>
> Let the chairs know if you have change requests for the agenda.
>
> Information about remote participation:
> WebEx information will be distributed on the SFC WG mailing list.
>
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
>


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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Martin Stiemerling <mls.ietf@gmail.com>
Thread-Topic: [sfc] Announcement: Oct 14th -- virtual interim about Security and Metadata
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Subject: Re: [sfc] Announcement: Oct 14th -- virtual interim about Security and Metadata
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To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, Xuxiaohu <xuxiaohu@huawei.com>, "mpls@ietf.org" <mpls@ietf.org>
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Cc: "bier@ietf.org" <bier@ietf.org>, "sfc@ietf.org" <sfc@ietf.org>
Subject: Re: [sfc] [mpls] How to indicate the existence of an explicit protocol field immediately after the MPLS label stack?
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Sasha is correct, and I seem to remember a PW system that did meet an 
Ethernet packet with IPv4 as the first nibble and made such a mistake.


You can only use the first nibble as a disambiguator for example to 
distinguish IPv4 and IPv6 if you have some supplementary information 
telling you that the packet can only be either type IPv4 or IPv6.


Stewart



On 13/10/2016 06:36, Alexander Vainshtein wrote:
>
> Xiaohu and all,
>
> I respectfully disagree with your statement "*/the first nibble of the 
> MPLS payload has actually been used as an implicit protocol identifier 
> for some payloads/*". In the case of PWs the CW (with this first 
> nibble) may be not present at all, but even when it is present, its 
> first nibble is only used for disambiguation of the PW packets (so 
> that they cannot be mistakenly treated as IPv4 or IPv6 packets by the 
> ECMP mechanisms).
>
>
> My 2c,
>
> Sasha
>
>
>
>
>
>
>
> ------------------------------------------------------------------------
> *From:* mpls <mpls-bounces@ietf.org> on behalf of Xuxiaohu 
> <xuxiaohu@huawei.com>
> *Sent:* Thursday, October 13, 2016 6:49 AM
> *To:* mpls@ietf.org
> *Cc:* bier@ietf.org; sfc@ietf.org
> *Subject:* [mpls] How to indicate the existence of an explicit 
> protocol field immediately after the MPLS label stack?
> Hi all,
>
> It's well-known that the MPLS label stack has no EXPLICIT protocol 
> identifier field to indicate the protocol type of the MPLS payload. 
> However, the first nibble of the MPLS payload has actually been used 
> as an implicit protocol identifier for some payloads, such as IPv4 
> (0100), IPv6(0110) and MPLS-BIER (0101, for more details, please see 
> https://tools.ietf.org/html/draft-ietf-bier-mpls-encapsulation-05#page-5). 
> Unfortunately, the first nibble space is not enough for the 
> sustainable development of new encapsulation headers which may happen 
> to be encapsulated with an MPLS header. Furthermore, the remaining 
> first nibble space available for payload indication is only 0111 due 
> to the NSH specification 
> (https://tools.ietf.org/html/draft-ietf-sfc-nsh-10#page-7) unless the 
> NSH is restricted from being transported directly over the MPLS 
> transport (in this case the NSH is sadly not transport independent 
> anymore).
>
> Hence, it's seem necessary for us to consider the approach of 
> inserting an EXPLICIT protocol identifier field within the MPLS packet 
> as early as possible. The following are two possible ways of inserting 
> an EXPLICIT protocol identifier field within the MPLS packet:
>
> One is to use an SPL (or even ESPL) as described 
> (https://tools.ietf.org/html/draft-xu-mpls-payload-protocol-identifier-01). 
> See the following figure:
>
>      0                   1 2                   3
>      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>      |                 PIL                   | EXP |1|      TTL      |
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>      |0 0 0 0|       Reserved          |        Protocol Type        |
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>      | Payload                          |
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
> Another is to set the first nibble of the 4-octet entry containing the 
> protocol field to a dedicated value (e.g., 1111), as shown in the 
> following figure. In this case, there is no need to insert additional 
> label (s) (i.e., SPL or ESPL) anymore. The logic of the latter 
> approach is that the first nibble of the MPLS payload has been 
> implicitly used as a protocol id (e.g., in the case where the payload 
> is IPv4 or IPv6 packet), and since the 4-bit (implicit) protocol id 
> field is not extensible, we introduce a longer (explicit) protocol id 
> field as per the approach of ESPL.
>        0                   1 2                   3
>        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>        |             Bottom Label              | EXP |1|      TTL      |
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>        |0 1 1 1|       Reserved          | Protocol Type        |
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>        | Payload                          |
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
> IMHO, the benefits of introducing an explicit protocol id into the 
> MPLS packet include but not limited to: 1) provide a sustainable way 
> of indicating new MPLS payload types without any need of inserting one 
> additional label indicating the MPLS payloads (e.g., considering how 
> to transport NSH over MPLS networks); 2) there is no need any more for 
> each new encapsulation header to deal with the notorious first nibble 
> issue associated with MPLS individually. More specifically, there is 
> no need to intentionally avoid the first nibble of each new 
> encapsulation header from being 0100 (IPv4) or 0110 (IPv6).
>
> Any comments and suggestions are welcome.
>
> Best regards,
> Xiaohu
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls
> mpls Info Page - Internet Engineering Task Force 
> <https://www.ietf.org/mailman/listinfo/mpls>
> www.ietf.org
> For information about the MPLS working group, see 
> http://www.ietf.org/html.charters/mpls-charter.html. To see the 
> collection of prior postings to the list, visit ...
>
>
>
>
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://www.ietf.org/mailman/listinfo/mpls


--------------584D86D38972B862E24FD4FD
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<html>
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    <meta content="text/html; charset=windows-1252"
      http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    <p>Sasha is correct, and I seem to remember a PW system that did
      meet an Ethernet packet with IPv4 as the first nibble and made
      such a mistake.<br>
    </p>
    <p><br>
    </p>
    <p>You can only use the first nibble as a disambiguator for example
      to distinguish IPv4 and IPv6 if you have some supplementary
      information telling you that the packet can only be either type
      IPv4 or IPv6.</p>
    <p><br>
    </p>
    <p>Stewart<br>
    </p>
    <p><br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 13/10/2016 06:36, Alexander
      Vainshtein wrote:<br>
    </div>
    <blockquote
cite="mid:HE1PR0301MB22666341F0FC2F76AFEBF6DB9DDC0@HE1PR0301MB2266.eurprd03.prod.outlook.com"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html;
        charset=windows-1252">
      <style type="text/css" style="display:none;"><!-- P {margin-top:0;margin-bottom:0;} --></style>
      <div id="divtagdefaultwrapper"
        style="font-size:12pt;color:#000000;font-family:'Times New
        Roman', Times, serif;">
        <p><span style="color: rgb(33, 33, 33); font-size: 13.3333px;">Xiaohu
            and all,</span><br>
        </p>
        <p><span style="color: rgb(33, 33, 33); font-size: 13.3333px;">I
            respectfully disagree with your statement "<span
              style="font-family: &quot;Times New Roman&quot;, Times,
              serif, &quot;Apple Color Emoji&quot;, &quot;Segoe UI
              Emoji&quot;, NotoColorEmoji, &quot;Segoe UI Symbol&quot;,
              &quot;Android Emoji&quot;, EmojiSymbols; font-size:
              13.3333px;"><b><i><span style="background-color: rgb(255,
                    255, 0);">the first nibble of the MPLS payload has
                    actually been used as an implicit protocol
                    identifier for some payloads</span></i></b></span>".
            In the case of PWs the CW (with this first nibble) may be
            not present at all, but even when it is present, its first
            nibble is only used for disambiguation of the PW packets (so
            that they cannot be mistakenly treated as IPv4 or IPv6
            packets by the ECMP mechanisms).</span></p>
        <p><span style="color: rgb(33, 33, 33); font-size: 13.3333px;"><br>
          </span></p>
        <p><span style="color: rgb(33, 33, 33); font-size: 13.3333px;">My
            2c,</span></p>
        <p><span style="color: rgb(33, 33, 33); font-size: 13.3333px;">Sasha</span></p>
        <p><span style="color: rgb(33, 33, 33); font-size: 13.3333px;"><br>
          </span></p>
        <p><span style="color: rgb(33, 33, 33); font-size: 13.3333px;"><br>
          </span></p>
        <p><span style="color: rgb(33, 33, 33); font-size: 13.3333px;"><br>
          </span></p>
        <p><span style="color: rgb(33, 33, 33); font-size: 13.3333px;"><br>
          </span></p>
        <br>
        <br>
        <div style="color: rgb(0, 0, 0);">
          <div>
            <hr tabindex="-1" style="display:inline-block; width:98%">
            <div id="x_divRplyFwdMsg" dir="ltr"><font
                style="font-size:11pt" face="Calibri, sans-serif"
                color="#000000"><b>From:</b> mpls
                <a class="moz-txt-link-rfc2396E" href="mailto:mpls-bounces@ietf.org">&lt;mpls-bounces@ietf.org&gt;</a> on behalf of Xuxiaohu
                <a class="moz-txt-link-rfc2396E" href="mailto:xuxiaohu@huawei.com">&lt;xuxiaohu@huawei.com&gt;</a><br>
                <b>Sent:</b> Thursday, October 13, 2016 6:49 AM<br>
                <b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:mpls@ietf.org">mpls@ietf.org</a><br>
                <b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:bier@ietf.org">bier@ietf.org</a>; <a class="moz-txt-link-abbreviated" href="mailto:sfc@ietf.org">sfc@ietf.org</a><br>
                <b>Subject:</b> [mpls] How to indicate the existence of
                an explicit protocol field immediately after the MPLS
                label stack?</font>
              <div> </div>
            </div>
          </div>
          <font size="2"><span style="font-size:10pt;">
              <div class="PlainText">Hi all,<br>
                <br>
                It's well-known that the MPLS label stack has no
                EXPLICIT protocol identifier field to indicate the
                protocol type of the MPLS payload. However, the first
                nibble of the MPLS payload has actually been used as an
                implicit protocol identifier for some payloads, such as
                IPv4 (0100), IPv6(0110) and MPLS-BIER (0101, for more
                details, please see
                <a moz-do-not-send="true"
href="https://tools.ietf.org/html/draft-ietf-bier-mpls-encapsulation-05#page-5"
                  id="LPlnk95281" previewremoved="true">
https://tools.ietf.org/html/draft-ietf-bier-mpls-encapsulation-05#page-5</a>).
                Unfortunately, the first nibble space is not enough for
                the sustainable development of new encapsulation headers
                which may happen to be encapsulated with an MPLS header.
                Furthermore, the remaining first nibble space available
                for payload indication is only 0111 due to the NSH
                specification (<a moz-do-not-send="true"
                  href="https://tools.ietf.org/html/draft-ietf-sfc-nsh-10#page-7"
                  id="LPlnk148596" previewremoved="true">https://tools.ietf.org/html/draft-ietf-sfc-nsh-10#page-7</a>)
                unless the NSH is restricted from being transported
                directly over the MPLS transport (in this case the NSH
                is sadly not transport independent anymore).
                <br>
                <br>
                Hence, it's seem necessary for us to consider the
                approach of inserting an EXPLICIT protocol identifier
                field within the MPLS packet as early as possible. The
                following are two possible ways of inserting an EXPLICIT
                protocol identifier field within the MPLS packet:<br>
                <br>
                One is to use an SPL (or even ESPL) as described (<a
                  moz-do-not-send="true"
href="https://tools.ietf.org/html/draft-xu-mpls-payload-protocol-identifier-01"
                  id="LPlnk820464" previewremoved="true">https://tools.ietf.org/html/draft-xu-mpls-payload-protocol-identifier-01</a>).
                See the following figure:<br>
                <br>
                     0                   1                  
                2                   3<br>
                     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
                6 7 8 9 0 1<br>
                    
                +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br>
                     |                 PIL                   | EXP
                |1|      TTL      |<br>
                    
                +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br>
                     |0 0 0 0|       Reserved          |        Protocol
                Type        |<br>
                    
                +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br>
                     |                             
                Payload                          |<br>
                    
                +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br>
                <br>
                Another is to set the first nibble of the 4-octet entry
                containing the protocol field to a dedicated value
                (e.g., 1111), as shown in the following figure. In this
                case, there is no need to insert additional label (s)
                (i.e., SPL or ESPL) anymore. The logic of the latter
                approach is that the first nibble of the MPLS payload
                has been implicitly used as a protocol id (e.g., in the
                case where the payload is IPv4 or IPv6 packet), and
                since the 4-bit (implicit) protocol id field is not
                extensible, we introduce a longer (explicit) protocol id
                field as per the approach of ESPL. <br>
                       0                   1                  
                2                   3<br>
                       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4
                5 6 7 8 9 0 1<br>
                      
                +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br>
                       |             Bottom Label              | EXP
                |1|      TTL      |<br>
                      
                +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br>
                       |0 1 1 1|       Reserved          |       
                Protocol Type        |<br>
                      
                +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br>
                       |                             
                Payload                          |<br>
                      
                +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<br>
                <br>
                IMHO, the benefits of introducing an explicit protocol
                id into the MPLS packet include but not limited to: 1)
                provide a sustainable way of indicating new MPLS payload
                types without any need of inserting one additional label
                indicating the MPLS payloads (e.g., considering how to
                transport NSH over MPLS networks); 2) there is no need
                any more for each new encapsulation header to deal with
                the notorious first nibble issue associated with MPLS
                individually. More specifically, there is no need to
                intentionally avoid the first nibble of each new
                encapsulation header from being 0100 (IPv4) or 0110
                (IPv6).<br>
                <br>
                Any comments and suggestions are welcome.<br>
                <br>
                Best regards,<br>
                Xiaohu<br>
                <br>
                _______________________________________________<br>
                mpls mailing list<br>
                <a class="moz-txt-link-abbreviated" href="mailto:mpls@ietf.org">mpls@ietf.org</a><br>
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href="https://www.ietf.org/mailman/listinfo/mpls" target="_blank"
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                              Page - Internet Engineering Task Force</a></div>
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                            style="margin: 10px 0px 16px; color:
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                            font-family: wf_segoe-ui_normal, &quot;Segoe
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                            For information about the MPLS working
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                            <a class="moz-txt-link-freetext" href="http://www.ietf.org/html.charters/mpls-charter.html">http://www.ietf.org/html.charters/mpls-charter.html</a>.
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      <pre wrap="">_______________________________________________
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From nobody Thu Oct 13 07:17:02 2016
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Service Function Chaining of the IETF.

        Title           : Service Function Chaining Use Cases in Mobile Networks
        Authors         : Walter Haeffner
                          Jeffrey Napper
                          Martin Stiemerling
                          Diego R. Lopez
                          Jim Uttaro
	Filename        : draft-ietf-sfc-use-case-mobility-07.txt
	Pages           : 26
	Date            : 2016-10-13

Abstract:
   This document provides some exemplary use cases for service function
   chaining in mobile service provider networks.  The objective of this
   draft is not to cover all conceivable service chains in detail.
   Rather, the intention is to localize and explain the application
   domain of service chaining within mobile networks as far as it is
   required to complement the problem statement [RFC7498] and
   architecture framework [RFC7665] of the working group.

   Service function chains typically reside in a LAN segment which links
   the mobile access network to the actual application platforms located
   in the carrier's datacenters or somewhere else in the Internet.
   Service function chains (SFC) ensure a fair distribution of network
   resources according to agreed service policies, enhance the
   performance of service delivery or take care of security and privacy.
   SFCs may also include Value Added Services (VAS).  Commonly, SFCs are
   typical middle box based services.

   General considerations and specific use cases are presented in this
   document to demonstrate the different technical requirements of these
   goals for service function chaining in mobile service provider
   networks.

   The specification of service function chaining for mobile networks
   must take into account an interaction between service function chains
   and the 3GPP Policy and Charging Control (PCC) environment.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-sfc-use-case-mobility/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-sfc-use-case-mobility-07

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-use-case-mobility-07


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

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


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From nobody Fri Oct 14 07:41:28 2016
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From: Behcet Sarikaya <sarikaya2012@gmail.com>
Date: Fri, 14 Oct 2016 09:41:18 -0500
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Subject: [sfc] Oct 14th -- virtual interim Metadata agenda item
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 Folks,
Metadata defining drafts have been discussed as an agenda item in
todays meeting.
We would like to point out that there is already a draft we published

draft-sarikaya-sfc-sfctlvs-00.txt

Comments on this will appreciated.

Regards,

Behcet


From nobody Fri Oct 14 14:51:24 2016
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Fri, 14 Oct 2016 14:51:15 -0700
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Dear All,
the Common OAM Header draft been updated. Greatly appreciate your comments,
questions and suggestions.

Regards,
Greg

---------- Forwarded message ----------
From: <internet-drafts@ietf.org>
Date: Fri, Oct 14, 2016 at 2:02 PM
Subject: New Version Notification for draft-ooamdt-rtgwg-ooam-header-01.txt
To: Mach Chen <mach.chen@huawei.com>, Li Yizhou <liyizhou@huawei.com>,
Nagendra Kumar <naikumar@cisco.com>, Ignas Bagdonas <ibagdona@gmail.com>,
David Mozes <davidm@mellanox.com>, Gregory Mirsky <gregimirsky@gmail.com>,
Erik Nordmark <nordmark@acm.org>, David Dolson <ddolson@sandvine.com>,
Deepak Kumar <dekumar@cisco.com>



A new version of I-D, draft-ooamdt-rtgwg-ooam-header-01.txt
has been successfully submitted by Greg Mirsky and posted to the
IETF repository.

Name:           draft-ooamdt-rtgwg-ooam-header
Revision:       01
Title:          OAM Header for use in Overlay Networks
Document date:  2016-10-13
Group:          Individual Submission
Pages:          8
URL:            https://www.ietf.org/internet-drafts/draft-ooamdt-rtgwg-
ooam-header-01.txt
Status:         https://datatracker.ietf.org/doc/draft-ooamdt-rtgwg-ooam-
header/
Htmlized:       https://tools.ietf.org/html/draft-ooamdt-rtgwg-ooam-
header-01
Diff:           https://www.ietf.org/rfcdiff?url2=draft-ooamdt-rtgwg-ooam-
header-01

Abstract:
   This document introduces Overlay OAM Header to be used in overlay
   networks to de-multiplex Overlay OAM protocols.


My email address have changed since the last version. Appreciate your help.

Regards,
Greg

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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<div dir=3D"ltr">Dear All,<div>the Common OAM Header draft been updated. Gr=
eatly appreciate your comments, questions and suggestions.</div><div><br></=
div><div>Regards,</div><div>Greg</div><div><br><div class=3D"gmail_quote">-=
--------- Forwarded message ----------<br>From: <b class=3D"gmail_sendernam=
e"></b> <span dir=3D"ltr">&lt;<a href=3D"mailto:internet-drafts@ietf.org">i=
nternet-drafts@ietf.org</a>&gt;</span><br>Date: Fri, Oct 14, 2016 at 2:02 P=
M<br>Subject: New Version Notification for draft-ooamdt-rtgwg-ooam-header-0=
1.txt<br>To: Mach Chen &lt;<a href=3D"mailto:mach.chen@huawei.com">mach.che=
n@huawei.com</a>&gt;, Li Yizhou &lt;<a href=3D"mailto:liyizhou@huawei.com">=
liyizhou@huawei.com</a>&gt;, Nagendra Kumar &lt;<a href=3D"mailto:naikumar@=
cisco.com">naikumar@cisco.com</a>&gt;, Ignas Bagdonas &lt;<a href=3D"mailto=
:ibagdona@gmail.com">ibagdona@gmail.com</a>&gt;, David Mozes &lt;<a href=3D=
"mailto:davidm@mellanox.com">davidm@mellanox.com</a>&gt;, Gregory Mirsky &l=
t;<a href=3D"mailto:gregimirsky@gmail.com">gregimirsky@gmail.com</a>&gt;, E=
rik Nordmark &lt;<a href=3D"mailto:nordmark@acm.org">nordmark@acm.org</a>&g=
t;, David Dolson &lt;<a href=3D"mailto:ddolson@sandvine.com">ddolson@sandvi=
ne.com</a>&gt;, Deepak Kumar &lt;<a href=3D"mailto:dekumar@cisco.com">dekum=
ar@cisco.com</a>&gt;<br><br><br><br>
A new version of I-D, draft-ooamdt-rtgwg-ooam-<wbr>header-01.txt<br>
has been successfully submitted by Greg Mirsky and posted to the<br>
IETF repository.<br>
<br>
Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-ooamdt-rtgwg-ooam-heade=
r<br>
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A001<br>
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 OAM Header for use in Overlay Netw=
orks<br>
Document date:=C2=A0 2016-10-13<br>
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission<br>
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 8<br>
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://www.ietf.o=
rg/internet-drafts/draft-ooamdt-rtgwg-ooam-header-01.txt" rel=3D"noreferrer=
" target=3D"_blank">https://www.ietf.org/internet-<wbr>drafts/draft-ooamdt-=
rtgwg-<wbr>ooam-header-01.txt</a><br>
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.iet=
f.org/doc/draft-ooamdt-rtgwg-ooam-header/" rel=3D"noreferrer" target=3D"_bl=
ank">https://datatracker.ietf.org/<wbr>doc/draft-ooamdt-rtgwg-ooam-<wbr>hea=
der/</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://tools.ietf.org/html/=
draft-ooamdt-rtgwg-ooam-header-01" rel=3D"noreferrer" target=3D"_blank">htt=
ps://tools.ietf.org/html/<wbr>draft-ooamdt-rtgwg-ooam-<wbr>header-01</a><br=
>
Diff:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://www.ietf.o=
rg/rfcdiff?url2=3Ddraft-ooamdt-rtgwg-ooam-header-01" rel=3D"noreferrer" tar=
get=3D"_blank">https://www.ietf.org/rfcdiff?<wbr>url2=3Ddraft-ooamdt-rtgwg-=
ooam-<wbr>header-01</a><br>
<br>
Abstract:<br>
=C2=A0 =C2=A0This document introduces Overlay OAM Header to be used in over=
lay<br>
=C2=A0 =C2=A0networks to de-multiplex Overlay OAM protocols.<br>
<br>
<br>
My email address have changed since the last version. Appreciate your help.=
<br>
<br>
Regards,<br>
Greg<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 <a href=3D"http://tool=
s.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
The IETF Secretariat<br>
<br>
</div><br></div></div>

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From: Lucy yong <lucy.yong@huawei.com>
To: "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: metadata type 1 constraint
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Subject: [sfc] metadata type 1 constraint
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RFC7665 (SFC architecture) states  "This architecture allows an SF to be pa=
rt of multiple SFPs and SFCs."

NSH just specifies MD type1 with a 16 bytes field, and  NSH doc. states
   3.  NSH provides a mechanism to carry shared metadata between
       participating entities and service functions.  The semantics of
       the shared metadata is communicated via a control plane, which is
       outside the scope of this document, to participating nodes.

Comments: this mean: when an SF that is part of multiple SFCs and MD type 1=
 is used in some of SFCs, these SFCs MUST have the same metadata semantics.=
  This is because that NSH does not convey SFC identifier.  For MD type 2, =
different SFCs may insert different list of TLVs and each TLV has a type an=
d specified semantics along (the TLVs will be specified in different doc.).

Should we state out this constraint in NSH doc.

Lucy







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<p class=3D"MsoNormal">RFC7665 (SFC architecture) states &nbsp;<span lang=
=3D"EN">&#8220;This architecture allows an SF to be part of multiple SFPs a=
nd SFCs.&#8221;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN">NSH just specifies MD type1 with a=
 16 bytes field, and &nbsp;NSH doc. states
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN">&nbsp;&nbsp;&nbsp;3.&nbsp; NSH pro=
vides a mechanism to carry shared metadata between<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p; participating entities and service functions.&nbsp; The semantics of<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p; the shared metadata is communicated via a control plane, which is<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p; outside the scope of this document, to participating nodes.<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN">Comments: this mean: when an SF th=
at is part of multiple SFCs and MD type 1 is used in some of SFCs, these SF=
Cs MUST have the same metadata semantics. &nbsp;This is because that NSH do=
es not convey SFC identifier. &nbsp;For MD type
 2, different SFCs may insert different list of TLVs and each TLV has a typ=
e and specified semantics along (the TLVs will be specified in different do=
c.).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN">Should we state out this constrain=
t in NSH doc.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN">Lucy<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</body>
</html>

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From nobody Sun Oct 16 18:39:04 2016
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To: Lucy yong <lucy.yong@huawei.com>, "sfc@ietf.org" <sfc@ietf.org>
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From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Subject: Re: [sfc] metadata type 1 constraint
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A) I woud not want to state any such constraint in the NSH document, because
B) In fact, the SFP ID is in every NSH header.  So yes, there is context 
if it is needed

It is true that MD-2 is more flexible than MD-1.  I don't think anyone 
disagrees with that.

Yours,
Joel

On 10/16/16 3:25 PM, Lucy yong wrote:
> RFC7665 (SFC architecture) states  “This architecture allows an SF to be
> part of multiple SFPs and SFCs.”
>
>
>
> NSH just specifies MD type1 with a 16 bytes field, and  NSH doc. states
>
>    3.  NSH provides a mechanism to carry shared metadata between
>
>        participating entities and service functions.  The semantics of
>
>        the shared metadata is communicated via a control plane, which is
>
>        outside the scope of this document, to participating nodes.
>
>
>
> Comments: this mean: when an SF that is part of multiple SFCs and MD
> type 1 is used in some of SFCs, these SFCs MUST have the same metadata
> semantics.  This is because that NSH does not convey SFC identifier.
>  For MD type 2, different SFCs may insert different list of TLVs and
> each TLV has a type and specified semantics along (the TLVs will be
> specified in different doc.).
>
>
>
> Should we state out this constraint in NSH doc.
>
>
>
> Lucy
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
>


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From: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
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From nobody Mon Oct 17 07:50:45 2016
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From: Ron Parker <Ron_Parker@affirmednetworks.com>
To: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
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Gunter,

I strongly support this proposal.   It brings more specificity to Type 1 wh=
ich will undoubtedly improve interworking between different implementations=
 and between different administrative domains.

   Ron


-----Original Message-----
From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Van De Velde, Gunter (=
Nokia - BE)
Sent: Monday, October 17, 2016 5:15 AM
To: sfc@ietf.org
Subject: [GRAYMAIL] [sfc] FW: New Version Notification for draft-vandevelde=
-sfc-nsh-length-overload-00.txt

Short text about overloading NSH length field for NSH MD Type-1 as context =
allocation type, including proposal for backward compatibility.=20

G/

------

On 17/10/2016, 10:05, "internet-drafts@ietf.org" <internet-drafts@ietf.org>=
 wrote:

   =20
    A new version of I-D, draft-vandevelde-sfc-nsh-length-overload-00.txt
    has been successfully submitted by Gunter Van de Velde and posted to th=
e
    IETF repository.
   =20
    Name:		draft-vandevelde-sfc-nsh-length-overload
    Revision:	00
    Title:		Network Services Header Context Allocation Identifier
    Document date:	2016-10-17
    Group:		Individual Submission
    Pages:		5
    URL:            https://www.ietf.org/internet-drafts/draft-vandevelde-s=
fc-nsh-length-overload-00.txt
    Status:         https://datatracker.ietf.org/doc/draft-vandevelde-sfc-n=
sh-length-overload/
    Htmlized:       https://tools.ietf.org/html/draft-vandevelde-sfc-nsh-le=
ngth-overload-00
   =20
   =20
    Abstract:
       The specification of the NSH MD Type 1 header [draft-ietf-sfc-nsh]
       mandates four Context Headers, 4-byte each, and they MUST be added
       immediately following the Service Path Header.  As direct
       consequence, an NSH MD Type 1 header is always Length 0x6 (six 4-byt=
e
       words).  As a result, the Length field of the NSH MD Type 1 header
       provides an information which is known by simply looking at the "MD
       Type" field.  However, while [draft-ietf-sfc-nsh] does not specify
       the encoding of these Context Headers, other specifications have
       started to do so.  A need to distinguish types of Context Headers
       therefore arises.
   =20
       This draft proposes to overload the Length field of an NSH MD Type 1
       as Meta-Data context allocation identifier and to create a IANA
       repository for NSH MD Type 1 allocation schemes.  The NSH MD Type 1
       Length field overload intends to allow universal understanding at an=
y
       network location and by any network device of the context allocation
       structure.
   =20
   =20
                                                                           =
          =20
   =20
   =20
    Please note that it may take a couple of minutes from the time of submi=
ssion
    until the htmlized version and diff are available at tools.ietf.org.
   =20
    The IETF Secretariat
   =20
   =20

_______________________________________________
sfc mailing list
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From nobody Mon Oct 17 08:07:56 2016
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From: Lucy yong <lucy.yong@huawei.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] metadata type 1 constraint
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Subject: Re: [sfc] metadata type 1 constraint
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Suggestions:

Section 3.4 should mention that this section only defines MD type 1 format.=
 The semantics of MD Type 1 is outside the scope of this document. Thus, th=
e use of MD type 1 is outside the scope of this document.

Section 3.5 should mention that this section only defines MEF type 2 format=
. The semantics of MD type 2 is outside the scope of this document. Thus, t=
he use of MD type 2 is outside the scope of this documents.

IMO: these statements are important for the sections.=20

Joel, MD semantics is critical for SFs. More than one semantics of MD type =
1 MUST NOT be specified for a SF. This should be a requirement in the SFC a=
rch. as a result of NSH design's, but the architecture is already published=
. Maybe control plane requirement is the place to state this out as the res=
ult of SFC arch and NSH design.

Thanks,
Lucy=20

-----Original Message-----
From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Joel M. Halpern
Sent: Sunday, October 16, 2016 8:39 PM
To: Lucy yong; sfc@ietf.org
Subject: Re: [sfc] metadata type 1 constraint

A) I woud not want to state any such constraint in the NSH document, becaus=
e
B) In fact, the SFP ID is in every NSH header.  So yes, there is context if=
 it is needed

It is true that MD-2 is more flexible than MD-1.  I don't think anyone disa=
grees with that.

Yours,
Joel

On 10/16/16 3:25 PM, Lucy yong wrote:
> RFC7665 (SFC architecture) states  "This architecture allows an SF to=20
> be part of multiple SFPs and SFCs."
>
>
>
> NSH just specifies MD type1 with a 16 bytes field, and  NSH doc.=20
> states
>
>    3.  NSH provides a mechanism to carry shared metadata between
>
>        participating entities and service functions.  The semantics of
>
>        the shared metadata is communicated via a control plane, which=20
> is
>
>        outside the scope of this document, to participating nodes.
>
>
>
> Comments: this mean: when an SF that is part of multiple SFCs and MD=20
> type 1 is used in some of SFCs, these SFCs MUST have the same metadata=20
> semantics.  This is because that NSH does not convey SFC identifier.
>  For MD type 2, different SFCs may insert different list of TLVs and=20
> each TLV has a type and specified semantics along (the TLVs will be=20
> specified in different doc.).
>
>
>
> Should we state out this constraint in NSH doc.
>
>
>
> Lucy
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
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From nobody Mon Oct 17 09:10:27 2016
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From: Dave Dolson <ddolson@sandvine.com>
To: Ron Parker <Ron_Parker@affirmednetworks.com>, "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
Thread-Index: AQHSKFb3nGfrmaRz20ejmkNdPaiXgqCsuqOQgAAUwb0=
Date: Mon, 17 Oct 2016 16:10:17 +0000
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Subject: Re: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
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=0A=
I would prefer to see the length field always mean length, so that implemen=
tations not requiring metadata can just skip the metadata regardless of MD =
type. =0A=
=0A=
At the risk of stating the obvious, there already is an MD type field that =
can be used to discriminate metadata allocations. Values 3,4,5,... are avai=
lable for different MD encodings.=0A=
=0A=
-Dave=0A=
=0A=
________________________________________=0A=
From: sfc [sfc-bounces@ietf.org] on behalf of Ron Parker [Ron_Parker@affirm=
ednetworks.com]=0A=
Sent: Monday, October 17, 2016 10:50 AM=0A=
To: Van De Velde, Gunter (Nokia - BE); sfc@ietf.org=0A=
Subject: Re: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-le=
ngth-overload-00.txt=0A=
=0A=
Gunter,=0A=
=0A=
I strongly support this proposal.   It brings more specificity to Type 1 wh=
ich will undoubtedly improve interworking between different implementations=
 and between different administrative domains.=0A=
=0A=
   Ron=0A=
=0A=
=0A=
-----Original Message-----=0A=
From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Van De Velde, Gunter (=
Nokia - BE)=0A=
Sent: Monday, October 17, 2016 5:15 AM=0A=
To: sfc@ietf.org=0A=
Subject: [GRAYMAIL] [sfc] FW: New Version Notification for draft-vandevelde=
-sfc-nsh-length-overload-00.txt=0A=
=0A=
Short text about overloading NSH length field for NSH MD Type-1 as context =
allocation type, including proposal for backward compatibility.=0A=
=0A=
G/=0A=
=0A=
------=0A=
=0A=
On 17/10/2016, 10:05, "internet-drafts@ietf.org" <internet-drafts@ietf.org>=
 wrote:=0A=
=0A=
=0A=
    A new version of I-D, draft-vandevelde-sfc-nsh-length-overload-00.txt=
=0A=
    has been successfully submitted by Gunter Van de Velde and posted to th=
e=0A=
    IETF repository.=0A=
=0A=
    Name:               draft-vandevelde-sfc-nsh-length-overload=0A=
    Revision:   00=0A=
    Title:              Network Services Header Context Allocation Identifi=
er=0A=
    Document date:      2016-10-17=0A=
    Group:              Individual Submission=0A=
    Pages:              5=0A=
    URL:            https://www.ietf.org/internet-drafts/draft-vandevelde-s=
fc-nsh-length-overload-00.txt=0A=
    Status:         https://datatracker.ietf.org/doc/draft-vandevelde-sfc-n=
sh-length-overload/=0A=
    Htmlized:       https://tools.ietf.org/html/draft-vandevelde-sfc-nsh-le=
ngth-overload-00=0A=
=0A=
=0A=
    Abstract:=0A=
       The specification of the NSH MD Type 1 header [draft-ietf-sfc-nsh]=
=0A=
       mandates four Context Headers, 4-byte each, and they MUST be added=
=0A=
       immediately following the Service Path Header.  As direct=0A=
       consequence, an NSH MD Type 1 header is always Length 0x6 (six 4-byt=
e=0A=
       words).  As a result, the Length field of the NSH MD Type 1 header=
=0A=
       provides an information which is known by simply looking at the "MD=
=0A=
       Type" field.  However, while [draft-ietf-sfc-nsh] does not specify=
=0A=
       the encoding of these Context Headers, other specifications have=0A=
       started to do so.  A need to distinguish types of Context Headers=0A=
       therefore arises.=0A=
=0A=
       This draft proposes to overload the Length field of an NSH MD Type 1=
=0A=
       as Meta-Data context allocation identifier and to create a IANA=0A=
       repository for NSH MD Type 1 allocation schemes.  The NSH MD Type 1=
=0A=
       Length field overload intends to allow universal understanding at an=
y=0A=
       network location and by any network device of the context allocation=
=0A=
       structure.=0A=
=0A=
=0A=
=0A=
=0A=
=0A=
    Please note that it may take a couple of minutes from the time of submi=
ssion=0A=
    until the htmlized version and diff are available at tools.ietf.org.=0A=
=0A=
    The IETF Secretariat=0A=
=0A=
=0A=
=0A=
_______________________________________________=0A=
sfc mailing list=0A=
sfc@ietf.org=0A=
https://www.ietf.org/mailman/listinfo/sfc=0A=
=0A=
_______________________________________________=0A=
sfc mailing list=0A=
sfc@ietf.org=0A=
https://www.ietf.org/mailman/listinfo/sfc=0A=


From nobody Mon Oct 17 09:44:15 2016
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From: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
To: Lucy yong <lucy.yong@huawei.com>, "Joel M. Halpern" <jmh@joelhalpern.com>,  "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] metadata type 1 constraint
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Date: Mon, 17 Oct 2016 16:44:05 +0000
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Subject: Re: [sfc] metadata type 1 constraint
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From: Lucy yong <lucy.yong@huawei.com>
To: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, "Joel M. Halpern" <jmh@joelhalpern.com>, "sfc@ietf.org" <sfc@ietf.org>
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From: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
To: Dave Dolson <ddolson@sandvine.com>, Ron Parker <Ron_Parker@affirmednetworks.com>, "sfc@ietf.org" <sfc@ietf.org>
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From: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
To: Lucy yong <lucy.yong@huawei.com>, "Joel M. Halpern" <jmh@joelhalpern.com>,  "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] metadata type 1 constraint
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Date: Mon, 17 Oct 2016 16:57:43 +0000
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Subject: Re: [sfc] metadata type 1 constraint
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From: Lucy yong <lucy.yong@huawei.com>
To: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, "Joel M. Halpern" <jmh@joelhalpern.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] metadata type 1 constraint
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Subject: Re: [sfc] metadata type 1 constraint
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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Lucy yong <lucy.yong@huawei.com>
Thread-Topic: [sfc] metadata type 1 constraint
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Date: Mon, 17 Oct 2016 17:06:08 +0000
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Subject: Re: [sfc] metadata type 1 constraint
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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Dave Dolson <ddolson@sandvine.com>
Thread-Topic: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
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Date: Mon, 17 Oct 2016 17:07:28 +0000
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References: <147669153801.4599.10302546498954955094.idtracker@ietfa.amsl.com> <9D949D9D-FDB5-4512-B300-0DF3D2B00E38@alcatel-lucent.com> <CDF2F015F4429F458815ED2A6C2B6B0B838F61C5@MBX021-W3-CA-2.exch021.domain.local> <E8355113905631478EFF04F5AA706E98311067F4@wtl-exchp-2.sandvine.com>
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Cc: "sfc@ietf.org" <sfc@ietf.org>, Ron Parker <Ron_Parker@affirmednetworks.com>, "Van De Velde, Gunter \(Nokia - BE\)" <gunter.van_de_velde@nokia.com>
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From: Lucy yong <lucy.yong@huawei.com>
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
Thread-Topic: [sfc] metadata type 1 constraint
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Date: Mon, 17 Oct 2016 17:10:23 +0000
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Subject: Re: [sfc] metadata type 1 constraint
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--_000_2691CE0099834E4A9C5044EEC662BB9D572E1AADdfweml501mbb_--


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From: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, Dave Dolson <ddolson@sandvine.com>
Thread-Topic: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
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Date: Mon, 17 Oct 2016 18:14:56 +0000
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Subject: Re: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
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From nobody Mon Oct 17 13:32:19 2016
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From: Lucy yong <lucy.yong@huawei.com>
To: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, Dave Dolson <ddolson@sandvine.com>
Thread-Topic: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
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Date: Mon, 17 Oct 2016 20:32:10 +0000
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Subject: Re: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
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To: Lucy yong <lucy.yong@huawei.com>, "Joel M. Halpern" <jmh@joelhalpern.com>, "sfc@ietf.org" <sfc@ietf.org>
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Subject: Re: [sfc] metadata type 1 constraint
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X-List-Received-Date: Tue, 18 Oct 2016 01:48:36 -0000

Lucy, while your two text proposals are not wrong, I do not see them as 
adding any clarity to the document.  The sections are very short and 
clearly define only the syntax.

With regard to SF and MD-1 support, there is absolutely nothing that 
requires an SF to support only one MD-1 structure.  Rather, the control 
mechanisms will tell the SF how to extract the data it needs from the 
MD-1 header.
I believe there is already text in the control plane requirements 
document that describes the need for this control functionality.

Yours,
Joel

On 10/17/16 11:07 AM, Lucy yong wrote:
> Suggestions:
>
> Section 3.4 should mention that this section only defines MD type 1
> format. The semantics of MD Type 1 is outside the scope of this
> document. Thus, the use of MD type 1 is outside the scope of this
> document.
>
> Section 3.5 should mention that this section only defines MEF type 2
> format. The semantics of MD type 2 is outside the scope of this
> document. Thus, the use of MD type 2 is outside the scope of this
> documents.
>
> IMO: these statements are important for the sections.
>
> Joel, MD semantics is critical for SFs. More than one semantics of MD
> type 1 MUST NOT be specified for a SF. This should be a requirement
> in the SFC arch. as a result of NSH design's, but the architecture is
> already published. Maybe control plane requirement is the place to
> state this out as the result of SFC arch and NSH design.
>
> Thanks, Lucy
>
> -----Original Message----- From: sfc [mailto:sfc-bounces@ietf.org] On
> Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:39 PM To:
> Lucy yong; sfc@ietf.org Subject: Re: [sfc] metadata type 1
> constraint
>
> A) I woud not want to state any such constraint in the NSH document,
> because B) In fact, the SFP ID is in every NSH header.  So yes, there
> is context if it is needed
>
> It is true that MD-2 is more flexible than MD-1.  I don't think
> anyone disagrees with that.
>
> Yours, Joel
>
> On 10/16/16 3:25 PM, Lucy yong wrote:
>> RFC7665 (SFC architecture) states  "This architecture allows an SF
>> to be part of multiple SFPs and SFCs."
>>
>>
>>
>> NSH just specifies MD type1 with a 16 bytes field, and  NSH doc.
>> states
>>
>> 3.  NSH provides a mechanism to carry shared metadata between
>>
>> participating entities and service functions.  The semantics of
>>
>> the shared metadata is communicated via a control plane, which is
>>
>> outside the scope of this document, to participating nodes.
>>
>>
>>
>> Comments: this mean: when an SF that is part of multiple SFCs and
>> MD type 1 is used in some of SFCs, these SFCs MUST have the same
>> metadata semantics.  This is because that NSH does not convey SFC
>> identifier. For MD type 2, different SFCs may insert different list
>> of TLVs and each TLV has a type and specified semantics along (the
>> TLVs will be specified in different doc.).
>>
>>
>>
>> Should we state out this constraint in NSH doc.
>>
>>
>>
>> Lucy
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> _______________________________________________ sfc mailing list
>> sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc
>>
>
> _______________________________________________ sfc mailing list
> sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc
>


From nobody Mon Oct 17 19:09:57 2016
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To: Dave Dolson <ddolson@sandvine.com>, Ron Parker <Ron_Parker@affirmednetworks.com>, "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, "sfc@ietf.org" <sfc@ietf.org>
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From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Date: Mon, 17 Oct 2016 22:10:35 -0400
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Subject: Re: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
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I agree with Dave.  The length field should always mean length.
One of the strong benefits of this is that if there is a need (for 
logging, analysis, ...) to get to the data packet but not to understand 
the metadata, the length field always just works.  This significantly 
simplifies many code paths.

Yours,
Joel

On 10/17/16 12:10 PM, Dave Dolson wrote:
>
> I would prefer to see the length field always mean length, so that implementations not requiring metadata can just skip the metadata regardless of MD type.
>
> At the risk of stating the obvious, there already is an MD type field that can be used to discriminate metadata allocations. Values 3,4,5,... are available for different MD encodings.
>
> -Dave
>
> ________________________________________
> From: sfc [sfc-bounces@ietf.org] on behalf of Ron Parker [Ron_Parker@affirmednetworks.com]
> Sent: Monday, October 17, 2016 10:50 AM
> To: Van De Velde, Gunter (Nokia - BE); sfc@ietf.org
> Subject: Re: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
>
> Gunter,
>
> I strongly support this proposal.   It brings more specificity to Type 1 which will undoubtedly improve interworking between different implementations and between different administrative domains.
>
>    Ron
>
>
> -----Original Message-----
> From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Van De Velde, Gunter (Nokia - BE)
> Sent: Monday, October 17, 2016 5:15 AM
> To: sfc@ietf.org
> Subject: [GRAYMAIL] [sfc] FW: New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
>
> Short text about overloading NSH length field for NSH MD Type-1 as context allocation type, including proposal for backward compatibility.
>
> G/
>
> ------
>
> On 17/10/2016, 10:05, "internet-drafts@ietf.org" <internet-drafts@ietf.org> wrote:
>
>
>     A new version of I-D, draft-vandevelde-sfc-nsh-length-overload-00.txt
>     has been successfully submitted by Gunter Van de Velde and posted to the
>     IETF repository.
>
>     Name:               draft-vandevelde-sfc-nsh-length-overload
>     Revision:   00
>     Title:              Network Services Header Context Allocation Identifier
>     Document date:      2016-10-17
>     Group:              Individual Submission
>     Pages:              5
>     URL:            https://www.ietf.org/internet-drafts/draft-vandevelde-sfc-nsh-length-overload-00.txt
>     Status:         https://datatracker.ietf.org/doc/draft-vandevelde-sfc-nsh-length-overload/
>     Htmlized:       https://tools.ietf.org/html/draft-vandevelde-sfc-nsh-length-overload-00
>
>
>     Abstract:
>        The specification of the NSH MD Type 1 header [draft-ietf-sfc-nsh]
>        mandates four Context Headers, 4-byte each, and they MUST be added
>        immediately following the Service Path Header.  As direct
>        consequence, an NSH MD Type 1 header is always Length 0x6 (six 4-byte
>        words).  As a result, the Length field of the NSH MD Type 1 header
>        provides an information which is known by simply looking at the "MD
>        Type" field.  However, while [draft-ietf-sfc-nsh] does not specify
>        the encoding of these Context Headers, other specifications have
>        started to do so.  A need to distinguish types of Context Headers
>        therefore arises.
>
>        This draft proposes to overload the Length field of an NSH MD Type 1
>        as Meta-Data context allocation identifier and to create a IANA
>        repository for NSH MD Type 1 allocation schemes.  The NSH MD Type 1
>        Length field overload intends to allow universal understanding at any
>        network location and by any network device of the context allocation
>        structure.
>
>
>
>
>
>     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
>
>
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
>
> _______________________________________________
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>


From nobody Mon Oct 17 22:38:00 2016
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To: Lucy yong <lucy.yong@huawei.com>, "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, Dave Dolson <ddolson@sandvine.com>
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From: Lucy yong <lucy.yong@huawei.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] metadata type 1 constraint
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Subject: Re: [sfc] metadata type 1 constraint
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Joel,

Lucy, while your two text proposals are not wrong, I do not see them as add=
ing any clarity to the document.  The sections are very short and clearly d=
efine only the syntax.
[Lucy] True. However, for this document, readers expect Section 3 to descri=
be NSH syntax and semantics. Section 3.1-3.3 do both. If section 3.4 and 3.=
5 just specify the syntax, from documenting perspective, it is important to=
 explicitly state the two text out.=20

With regard to SF and MD-1 support, there is absolutely nothing that requir=
es an SF to support only one MD-1 structure.  Rather, the control mechanism=
s will tell the SF how to extract the data it needs from the MD-1 header.
[Lucy] This puts much uncertainty for a single SF on what to implement, whi=
ch causes people's concern. IMO, if we don't have a way to address this cha=
llenge here (you stated in interim meeting), pushing it to another place do=
es not solve/address it. For example,  will the control mechanisms tell an =
SF how to extract the data it needs from the MD-1 header per a SFP, or per =
a SFC, or for all SFC packets, or per payload flow, or combination of them?=
 This will significantly impact SF implementation. The reason having MD typ=
e 1 is that is hardware friendly. Leaving these uncertainty open, not sure =
if the reason still makes a sense.

Lucy
I believe there is already text in the control plane requirements document =
that describes the need for this control functionality.

=20

Yours,
Joel

On 10/17/16 11:07 AM, Lucy yong wrote:
> Suggestions:
>
> Section 3.4 should mention that this section only defines MD type 1=20
> format. The semantics of MD Type 1 is outside the scope of this=20
> document. Thus, the use of MD type 1 is outside the scope of this=20
> document.
>
> Section 3.5 should mention that this section only defines MEF type 2=20
> format. The semantics of MD type 2 is outside the scope of this=20
> document. Thus, the use of MD type 2 is outside the scope of this=20
> documents.
>
> IMO: these statements are important for the sections.
>
> Joel, MD semantics is critical for SFs. More than one semantics of MD=20
> type 1 MUST NOT be specified for a SF. This should be a requirement in=20
> the SFC arch. as a result of NSH design's, but the architecture is=20
> already published. Maybe control plane requirement is the place to=20
> state this out as the result of SFC arch and NSH design.
>
> Thanks, Lucy
>
> -----Original Message----- From: sfc [mailto:sfc-bounces@ietf.org] On=20
> Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:39 PM To:
> Lucy yong; sfc@ietf.org Subject: Re: [sfc] metadata type 1 constraint
>
> A) I woud not want to state any such constraint in the NSH document,=20
> because B) In fact, the SFP ID is in every NSH header.  So yes, there=20
> is context if it is needed
>
> It is true that MD-2 is more flexible than MD-1.  I don't think anyone=20
> disagrees with that.
>
> Yours, Joel
>
> On 10/16/16 3:25 PM, Lucy yong wrote:
>> RFC7665 (SFC architecture) states  "This architecture allows an SF to=20
>> be part of multiple SFPs and SFCs."
>>
>>
>>
>> NSH just specifies MD type1 with a 16 bytes field, and  NSH doc.
>> states
>>
>> 3.  NSH provides a mechanism to carry shared metadata between
>>
>> participating entities and service functions.  The semantics of
>>
>> the shared metadata is communicated via a control plane, which is
>>
>> outside the scope of this document, to participating nodes.
>>
>>
>>
>> Comments: this mean: when an SF that is part of multiple SFCs and MD=20
>> type 1 is used in some of SFCs, these SFCs MUST have the same=20
>> metadata semantics.  This is because that NSH does not convey SFC=20
>> identifier. For MD type 2, different SFCs may insert different list=20
>> of TLVs and each TLV has a type and specified semantics along (the=20
>> TLVs will be specified in different doc.).
>>
>>
>>
>> Should we state out this constraint in NSH doc.
>>
>>
>>
>> Lucy
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> _______________________________________________ sfc mailing list=20
>> sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc
>>
>
> _______________________________________________ sfc mailing list=20
> sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc
>


From nobody Tue Oct 18 07:27:45 2016
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From: Lucy yong <lucy.yong@huawei.com>
To: "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>, "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, Dave Dolson <ddolson@sandvine.com>
Thread-Topic: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
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Subject: Re: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
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From: <mohamed.boucadair@orange.com>
To: Lucy yong <lucy.yong@huawei.com>, "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, Dave Dolson <ddolson@sandvine.com>
Thread-Topic: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
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Date: Tue, 18 Oct 2016 14:53:15 +0000
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Subject: Re: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
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From nobody Tue Oct 18 08:04:37 2016
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From: Ron Parker <Ron_Parker@affirmednetworks.com>
To: Lucy yong <lucy.yong@huawei.com>, "Joel M. Halpern" <jmh@joelhalpern.com>,  "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] metadata type 1 constraint
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Date: Tue, 18 Oct 2016 15:04:30 +0000
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Subject: Re: [sfc] metadata type 1 constraint
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Even though the interpretation of metadata is dependent on control plane in=
teraction, where I think the original proposal has value is that there migh=
t be multiple separate interpretations simultaneously within the same admin=
istrative domain.   A way to describe, on the wire, which of those interpre=
tations is in force for that particular SFP seems valuable to me.   You cou=
ld definitely argue that the control plane could install the interpretation=
 locally on a per SFP basis;  also being explicit on the wire will likely e=
nhance interoperability and debuggability.

The value would be locally significant within the administrative domain (i.=
e., metadata schema 1, metatadata schema 2, etc.).   Overloading length is =
one way.   Overloading MD-type is another.   Allocating a nibble or byte wi=
thin the 32 bytes (probably the first nibble or byte) is yet another.

   Ron
=20

-----Original Message-----
From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Lucy yong
Sent: Tuesday, October 18, 2016 10:27 AM
To: Joel M. Halpern <jmh@joelhalpern.com>; sfc@ietf.org
Subject: Re: [sfc] metadata type 1 constraint

Joel,

Lucy, while your two text proposals are not wrong, I do not see them as add=
ing any clarity to the document.  The sections are very short and clearly d=
efine only the syntax.
[Lucy] True. However, for this document, readers expect Section 3 to descri=
be NSH syntax and semantics. Section 3.1-3.3 do both. If section 3.4 and 3.=
5 just specify the syntax, from documenting perspective, it is important to=
 explicitly state the two text out.=20

With regard to SF and MD-1 support, there is absolutely nothing that requir=
es an SF to support only one MD-1 structure.  Rather, the control mechanism=
s will tell the SF how to extract the data it needs from the MD-1 header.
[Lucy] This puts much uncertainty for a single SF on what to implement, whi=
ch causes people's concern. IMO, if we don't have a way to address this cha=
llenge here (you stated in interim meeting), pushing it to another place do=
es not solve/address it. For example,  will the control mechanisms tell an =
SF how to extract the data it needs from the MD-1 header per a SFP, or per =
a SFC, or for all SFC packets, or per payload flow, or combination of them?=
 This will significantly impact SF implementation. The reason having MD typ=
e 1 is that is hardware friendly. Leaving these uncertainty open, not sure =
if the reason still makes a sense.

Lucy
I believe there is already text in the control plane requirements document =
that describes the need for this control functionality.

=20

Yours,
Joel

On 10/17/16 11:07 AM, Lucy yong wrote:
> Suggestions:
>
> Section 3.4 should mention that this section only defines MD type 1=20
> format. The semantics of MD Type 1 is outside the scope of this=20
> document. Thus, the use of MD type 1 is outside the scope of this=20
> document.
>
> Section 3.5 should mention that this section only defines MEF type 2=20
> format. The semantics of MD type 2 is outside the scope of this=20
> document. Thus, the use of MD type 2 is outside the scope of this=20
> documents.
>
> IMO: these statements are important for the sections.
>
> Joel, MD semantics is critical for SFs. More than one semantics of MD=20
> type 1 MUST NOT be specified for a SF. This should be a requirement in=20
> the SFC arch. as a result of NSH design's, but the architecture is=20
> already published. Maybe control plane requirement is the place to=20
> state this out as the result of SFC arch and NSH design.
>
> Thanks, Lucy
>
> -----Original Message----- From: sfc [mailto:sfc-bounces@ietf.org] On=20
> Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:39 PM To:
> Lucy yong; sfc@ietf.org Subject: Re: [sfc] metadata type 1 constraint
>
> A) I woud not want to state any such constraint in the NSH document,=20
> because B) In fact, the SFP ID is in every NSH header.  So yes, there=20
> is context if it is needed
>
> It is true that MD-2 is more flexible than MD-1.  I don't think anyone=20
> disagrees with that.
>
> Yours, Joel
>
> On 10/16/16 3:25 PM, Lucy yong wrote:
>> RFC7665 (SFC architecture) states  "This architecture allows an SF to=20
>> be part of multiple SFPs and SFCs."
>>
>>
>>
>> NSH just specifies MD type1 with a 16 bytes field, and  NSH doc.
>> states
>>
>> 3.  NSH provides a mechanism to carry shared metadata between
>>
>> participating entities and service functions.  The semantics of
>>
>> the shared metadata is communicated via a control plane, which is
>>
>> outside the scope of this document, to participating nodes.
>>
>>
>>
>> Comments: this mean: when an SF that is part of multiple SFCs and MD=20
>> type 1 is used in some of SFCs, these SFCs MUST have the same=20
>> metadata semantics.  This is because that NSH does not convey SFC=20
>> identifier. For MD type 2, different SFCs may insert different list=20
>> of TLVs and each TLV has a type and specified semantics along (the=20
>> TLVs will be specified in different doc.).
>>
>>
>>
>> Should we state out this constraint in NSH doc.
>>
>>
>>
>> Lucy
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> _______________________________________________ sfc mailing list=20
>> sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc
>>
>
> _______________________________________________ sfc mailing list=20
> sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc
>

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


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From: Lucy yong <lucy.yong@huawei.com>
To: Ron Parker <Ron_Parker@affirmednetworks.com>, "Joel M. Halpern" <jmh@joelhalpern.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] metadata type 1 constraint
Thread-Index: AdIn4xLyjD6K0BeCTVKJAwYgCy2h8QAbuCOAAAx8UZAAJibzAAAABU8wAAzLMIAAAOdtsA==
Date: Tue, 18 Oct 2016 15:49:11 +0000
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References: <2691CE0099834E4A9C5044EEC662BB9D572E17C7@dfweml501-mbb> <16dbb343-f630-9e02-2e30-71b9417a620b@joelhalpern.com> <2691CE0099834E4A9C5044EEC662BB9D572E19A9@dfweml501-mbb> <c2ecc85b-b972-07ab-2127-38152ccdf8e9@joelhalpern.com> <2691CE0099834E4A9C5044EEC662BB9D572E1FB3@dfweml501-mbb> <CDF2F015F4429F458815ED2A6C2B6B0B838F8DC8@MBX021-W3-CA-2.exch021.domain.local>
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Subject: Re: [sfc] metadata type 1 constraint
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Comment on "Allocating a nibble or byte within the 32 bytes (probably the f=
irst nibble or byte) is yet another."

Lucy: Technically We can do this on MD#1, but NSH already defines MD#2. Is =
the variable length the only feature that hardware can't deal with?=20

Lucy

-----Original Message-----
From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]=20
Sent: Tuesday, October 18, 2016 10:05 AM
To: Lucy yong; Joel M. Halpern; sfc@ietf.org
Subject: RE: [sfc] metadata type 1 constraint

Even though the interpretation of metadata is dependent on control plane in=
teraction, where I think the original proposal has value is that there migh=
t be multiple separate interpretations simultaneously within the same admin=
istrative domain.   A way to describe, on the wire, which of those interpre=
tations is in force for that particular SFP seems valuable to me.   You cou=
ld definitely argue that the control plane could install the interpretation=
 locally on a per SFP basis;  also being explicit on the wire will likely e=
nhance interoperability and debuggability.

The value would be locally significant within the administrative domain (i.=
e., metadata schema 1, metatadata schema 2, etc.).   Overloading length is =
one way.   Overloading MD-type is another.   Allocating a nibble or byte wi=
thin the 32 bytes (probably the first nibble or byte) is yet another.

   Ron
=20

-----Original Message-----
From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Lucy yong
Sent: Tuesday, October 18, 2016 10:27 AM
To: Joel M. Halpern <jmh@joelhalpern.com>; sfc@ietf.org
Subject: Re: [sfc] metadata type 1 constraint

Joel,

Lucy, while your two text proposals are not wrong, I do not see them as add=
ing any clarity to the document.  The sections are very short and clearly d=
efine only the syntax.
[Lucy] True. However, for this document, readers expect Section 3 to descri=
be NSH syntax and semantics. Section 3.1-3.3 do both. If section 3.4 and 3.=
5 just specify the syntax, from documenting perspective, it is important to=
 explicitly state the two text out.=20

With regard to SF and MD-1 support, there is absolutely nothing that requir=
es an SF to support only one MD-1 structure.  Rather, the control mechanism=
s will tell the SF how to extract the data it needs from the MD-1 header.
[Lucy] This puts much uncertainty for a single SF on what to implement, whi=
ch causes people's concern. IMO, if we don't have a way to address this cha=
llenge here (you stated in interim meeting), pushing it to another place do=
es not solve/address it. For example,  will the control mechanisms tell an =
SF how to extract the data it needs from the MD-1 header per a SFP, or per =
a SFC, or for all SFC packets, or per payload flow, or combination of them?=
 This will significantly impact SF implementation. The reason having MD typ=
e 1 is that is hardware friendly. Leaving these uncertainty open, not sure =
if the reason still makes a sense.

Lucy
I believe there is already text in the control plane requirements document =
that describes the need for this control functionality.

=20

Yours,
Joel

On 10/17/16 11:07 AM, Lucy yong wrote:
> Suggestions:
>
> Section 3.4 should mention that this section only defines MD type 1=20
> format. The semantics of MD Type 1 is outside the scope of this=20
> document. Thus, the use of MD type 1 is outside the scope of this=20
> document.
>
> Section 3.5 should mention that this section only defines MEF type 2=20
> format. The semantics of MD type 2 is outside the scope of this=20
> document. Thus, the use of MD type 2 is outside the scope of this=20
> documents.
>
> IMO: these statements are important for the sections.
>
> Joel, MD semantics is critical for SFs. More than one semantics of MD=20
> type 1 MUST NOT be specified for a SF. This should be a requirement in=20
> the SFC arch. as a result of NSH design's, but the architecture is=20
> already published. Maybe control plane requirement is the place to=20
> state this out as the result of SFC arch and NSH design.
>
> Thanks, Lucy
>
> -----Original Message----- From: sfc [mailto:sfc-bounces@ietf.org] On=20
> Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:39 PM To:
> Lucy yong; sfc@ietf.org Subject: Re: [sfc] metadata type 1 constraint
>
> A) I woud not want to state any such constraint in the NSH document,=20
> because B) In fact, the SFP ID is in every NSH header.  So yes, there=20
> is context if it is needed
>
> It is true that MD-2 is more flexible than MD-1.  I don't think anyone=20
> disagrees with that.
>
> Yours, Joel
>
> On 10/16/16 3:25 PM, Lucy yong wrote:
>> RFC7665 (SFC architecture) states  "This architecture allows an SF to=20
>> be part of multiple SFPs and SFCs."
>>
>>
>>
>> NSH just specifies MD type1 with a 16 bytes field, and  NSH doc.
>> states
>>
>> 3.  NSH provides a mechanism to carry shared metadata between
>>
>> participating entities and service functions.  The semantics of
>>
>> the shared metadata is communicated via a control plane, which is
>>
>> outside the scope of this document, to participating nodes.
>>
>>
>>
>> Comments: this mean: when an SF that is part of multiple SFCs and MD=20
>> type 1 is used in some of SFCs, these SFCs MUST have the same=20
>> metadata semantics.  This is because that NSH does not convey SFC=20
>> identifier. For MD type 2, different SFCs may insert different list=20
>> of TLVs and each TLV has a type and specified semantics along (the=20
>> TLVs will be specified in different doc.).
>>
>>
>>
>> Should we state out this constraint in NSH doc.
>>
>>
>>
>> Lucy
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> _______________________________________________ sfc mailing list=20
>> sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc
>>
>
> _______________________________________________ sfc mailing list=20
> sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc
>

_______________________________________________
sfc mailing list
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From: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
To: Lucy yong <lucy.yong@huawei.com>, Ron Parker <Ron_Parker@affirmednetworks.com>, "Joel M. Halpern" <jmh@joelhalpern.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] metadata type 1 constraint
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From: Behcet Sarikaya <sarikaya2012@gmail.com>
Date: Tue, 18 Oct 2016 11:13:56 -0500
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Subject: [sfc] Minutes of Service Function Chaining (sfc) WG Virtual Meeting: 2016-10-14
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 Hi all,

When are we going to have the minutes of this meeting?

regards,

Behcet

On Fri, Oct 7, 2016 at 2:50 PM, IESG Secretary <iesg-secretary@ietf.org> wrote:
> The Service Function Chaining (sfc) Working Group will hold
> a virtual interim meeting on 2016-10-14 from 10:00 to 12:00 US/Eastern.
>
> The meeting will start at 10am US east coast, which is
> - 10 pm Beijing
> - 4 pm Central Europe
> - 7 am US west coast
>
> Agenda:
> The draft agenda:
> 0) Administrativa
> 1) Agenda bashing
> 2) SFC security
> 3) Metadata
>
> Let the chairs know if you have change requests for the agenda.
>
> Information about remote participation:
> WebEx information will be distributed on the SFC WG mailing list.
>
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc


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To: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, Lucy yong <lucy.yong@huawei.com>, Ron Parker <Ron_Parker@affirmednetworks.com>, "sfc@ietf.org" <sfc@ietf.org>
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From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Subject: Re: [sfc] metadata type 1 constraint
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Our current approach is to allow definition of allocation schemes, but 
not to mandate any specific allocation scheme for MD-1.
That seems to me to be a good approach, workable, and what we have 
agreed and documented.

Yours,
Joel

On 10/18/16 12:09 PM, Van De Velde, Gunter (Nokia - BE) wrote:
> If NSH MD Type-1 defines for the metadata to be Opaque, then we should not make an effort to define it, and just tread it as Opaque content imo and live with the consequencesâ€¦and in that case use MD Type-2 for these types of well known metadata transport mechanisms.
>
> If however, we decide to define the allocation schemes, then we should also architect an indicator for the used allocation scheme.
> At this point in time, there models were suggested (overload Length, overload MD type, use few bits of MD context data).
> I strongly believe there is value in having the metadata allocation structure signalled within the NSH itself, even for MD Type-1.
> (It avoids control plane signalling and creates state which needs to be maintained, and that sounds as a very expensive operation).
>
> Alternate is to just say as Lucy suggests, and restrict MD Type-1 Service Chain SFâ€™s per allocation scheme. This is a solution that works, albeit it is a very impacting restriction for flexibility and resource sharing).
>
> G/
>
>
> On 18/10/2016, 16:49, "sfc on behalf of Lucy yong" <sfc-bounces@ietf.org on behalf of lucy.yong@huawei.com> wrote:
>
>     Comment on "Allocating a nibble or byte within the 32 bytes (probably the first nibble or byte) is yet another."
>
>     Lucy: Technically We can do this on MD#1, but NSH already defines MD#2. Is the variable length the only feature that hardware can't deal with?
>
>     Lucy
>
>     -----Original Message-----
>     From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
>     Sent: Tuesday, October 18, 2016 10:05 AM
>     To: Lucy yong; Joel M. Halpern; sfc@ietf.org
>     Subject: RE: [sfc] metadata type 1 constraint
>
>     Even though the interpretation of metadata is dependent on control plane interaction, where I think the original proposal has value is that there might be multiple separate interpretations simultaneously within the same administrative domain.   A way to describe, on the wire, which of those interpretations is in force for that particular SFP seems valuable to me.   You could definitely argue that the control plane could install the interpretation locally on a per SFP basis;  also being explicit on the wire will likely enhance interoperability and debuggability.
>
>     The value would be locally significant within the administrative domain (i.e., metadata schema 1, metatadata schema 2, etc.).   Overloading length is one way.   Overloading MD-type is another.   Allocating a nibble or byte within the 32 bytes (probably the first nibble or byte) is yet another.
>
>        Ron
>
>
>     -----Original Message-----
>     From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Lucy yong
>     Sent: Tuesday, October 18, 2016 10:27 AM
>     To: Joel M. Halpern <jmh@joelhalpern.com>; sfc@ietf.org
>     Subject: Re: [sfc] metadata type 1 constraint
>
>     Joel,
>
>     Lucy, while your two text proposals are not wrong, I do not see them as adding any clarity to the document.  The sections are very short and clearly define only the syntax.
>     [Lucy] True. However, for this document, readers expect Section 3 to describe NSH syntax and semantics. Section 3.1-3.3 do both. If section 3.4 and 3.5 just specify the syntax, from documenting perspective, it is important to explicitly state the two text out.
>
>     With regard to SF and MD-1 support, there is absolutely nothing that requires an SF to support only one MD-1 structure.  Rather, the control mechanisms will tell the SF how to extract the data it needs from the MD-1 header.
>     [Lucy] This puts much uncertainty for a single SF on what to implement, which causes people's concern. IMO, if we don't have a way to address this challenge here (you stated in interim meeting), pushing it to another place does not solve/address it. For example,  will the control mechanisms tell an SF how to extract the data it needs from the MD-1 header per a SFP, or per a SFC, or for all SFC packets, or per payload flow, or combination of them? This will significantly impact SF implementation. The reason having MD type 1 is that is hardware friendly. Leaving these uncertainty open, not sure if the reason still makes a sense.
>
>     Lucy
>     I believe there is already text in the control plane requirements document that describes the need for this control functionality.
>
>
>
>     Yours,
>     Joel
>
>     On 10/17/16 11:07 AM, Lucy yong wrote:
>     > Suggestions:
>     >
>     > Section 3.4 should mention that this section only defines MD type 1
>     > format. The semantics of MD Type 1 is outside the scope of this
>     > document. Thus, the use of MD type 1 is outside the scope of this
>     > document.
>     >
>     > Section 3.5 should mention that this section only defines MEF type 2
>     > format. The semantics of MD type 2 is outside the scope of this
>     > document. Thus, the use of MD type 2 is outside the scope of this
>     > documents.
>     >
>     > IMO: these statements are important for the sections.
>     >
>     > Joel, MD semantics is critical for SFs. More than one semantics of MD
>     > type 1 MUST NOT be specified for a SF. This should be a requirement in
>     > the SFC arch. as a result of NSH design's, but the architecture is
>     > already published. Maybe control plane requirement is the place to
>     > state this out as the result of SFC arch and NSH design.
>     >
>     > Thanks, Lucy
>     >
>     > -----Original Message----- From: sfc [mailto:sfc-bounces@ietf.org] On
>     > Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:39 PM To:
>     > Lucy yong; sfc@ietf.org Subject: Re: [sfc] metadata type 1 constraint
>     >
>     > A) I woud not want to state any such constraint in the NSH document,
>     > because B) In fact, the SFP ID is in every NSH header.  So yes, there
>     > is context if it is needed
>     >
>     > It is true that MD-2 is more flexible than MD-1.  I don't think anyone
>     > disagrees with that.
>     >
>     > Yours, Joel
>     >
>     > On 10/16/16 3:25 PM, Lucy yong wrote:
>     >> RFC7665 (SFC architecture) states  "This architecture allows an SF to
>     >> be part of multiple SFPs and SFCs."
>     >>
>     >>
>     >>
>     >> NSH just specifies MD type1 with a 16 bytes field, and  NSH doc.
>     >> states
>     >>
>     >> 3.  NSH provides a mechanism to carry shared metadata between
>     >>
>     >> participating entities and service functions.  The semantics of
>     >>
>     >> the shared metadata is communicated via a control plane, which is
>     >>
>     >> outside the scope of this document, to participating nodes.
>     >>
>     >>
>     >>
>     >> Comments: this mean: when an SF that is part of multiple SFCs and MD
>     >> type 1 is used in some of SFCs, these SFCs MUST have the same
>     >> metadata semantics.  This is because that NSH does not convey SFC
>     >> identifier. For MD type 2, different SFCs may insert different list
>     >> of TLVs and each TLV has a type and specified semantics along (the
>     >> TLVs will be specified in different doc.).
>     >>
>     >>
>     >>
>     >> Should we state out this constraint in NSH doc.
>     >>
>     >>
>     >>
>     >> Lucy
>     >>
>     >>
>     >>
>     >>
>     >>
>     >>
>     >>
>     >>
>     >>
>     >>
>     >>
>     >>
>     >>
>     >>
>     >>
>     >> _______________________________________________ sfc mailing list
>     >> sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc
>     >>
>     >
>     > _______________________________________________ sfc mailing list
>     > sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc
>     >
>
>     _______________________________________________
>     sfc mailing list
>     sfc@ietf.org
>     https://www.ietf.org/mailman/listinfo/sfc
>
>     _______________________________________________
>     sfc mailing list
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>     https://www.ietf.org/mailman/listinfo/sfc
>
>


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From: Lucy yong <lucy.yong@huawei.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>, "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, Ron Parker <Ron_Parker@affirmednetworks.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] metadata type 1 constraint
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From: <mohamed.boucadair@orange.com>
To: Lucy yong <lucy.yong@huawei.com>, "Joel M. Halpern" <jmh@joelhalpern.com>,  "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, "Ron Parker" <Ron_Parker@affirmednetworks.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] metadata type 1 constraint
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Date: Wed, 19 Oct 2016 12:22:52 +0000
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Subject: Re: [sfc] metadata type 1 constraint
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From: "Paul Quinn (paulq)" <paulq@cisco.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>
Thread-Topic: [sfc] metadata type 1 constraint
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Date: Wed, 19 Oct 2016 14:33:15 +0000
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Subject: Re: [sfc] metadata type 1 constraint
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From: Lucy yong <lucy.yong@huawei.com>
To: "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>, "Joel M. Halpern" <jmh@joelhalpern.com>, "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, Ron Parker <Ron_Parker@affirmednetworks.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] metadata type 1 constraint
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Subject: Re: [sfc] metadata type 1 constraint
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From: "Charles Eckel (eckelcu)" <eckelcu@cisco.com>
To: VictorVu <minowar91@gmail.com>, "hackathon@ietf.org" <hackathon@ietf.org>
Thread-Topic: [hackathon] SFC in Hackathon 97
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Date: Wed, 19 Oct 2016 15:16:30 +0000
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Subject: Re: [sfc] [hackathon] SFC in Hackathon 97
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From: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
To: "Paul Quinn (paulq)" <paulq@cisco.com>, "Joel M. Halpern" <jmh@joelhalpern.com>
Thread-Topic: [sfc] metadata type 1 constraint
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Subject: Re: [sfc] metadata type 1 constraint
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From: Lucy yong <lucy.yong@huawei.com>
To: "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>, "Joel M. Halpern" <jmh@joelhalpern.com>, "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, Ron Parker <Ron_Parker@affirmednetworks.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] metadata type 1 constraint
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Subject: Re: [sfc] metadata type 1 constraint
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From: Behcet Sarikaya <sarikaya2012@gmail.com>
Date: Thu, 20 Oct 2016 11:29:20 -0500
Message-ID: <CAC8QAcfb20=kLaS16FuijbVtkmtOdm5p3wincwZVDdSYds3CkQ@mail.gmail.com>
To: Lucy yong <lucy.yong@huawei.com>
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Cc: "Joel M. Halpern" <jmh@joelhalpern.com>, "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>, "sfc@ietf.org" <sfc@ietf.org>, Ron Parker <Ron_Parker@affirmednetworks.com>, "Van De Velde, Gunter \(Nokia - BE\)" <gunter.van_de_velde@nokia.com>
Subject: Re: [sfc] metadata type 1 constraint
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Hi Lucy,

Regarding semantics of metadata 1 and 2, that type of information
should be defined separately in the documents defining any new
metadata type 1 or 2 and standardized, as we discussed during the
interim.

The nsh doc, only defines the syntax that should be used in defining
so-called MD1 MD2.
Specific metadata will be defined in other documents. The semantics
refers to what is to be defined in those documents.

I just don't understand what is the point with these modifications you
are proposing?

Behcet

On Thu, Oct 20, 2016 at 10:44 AM, Lucy yong <lucy.yong@huawei.com> wrote:
> Hi Med, et al,
>
> Joel, Andy Malis, and I had some offline discussions of the interworking =
concern and what text should be added in NSH doc. and control plane require=
ment doc. to address the concern. Here is the discussed text:
>
> Add following text in Section 3.4 of NSH doc.
>
> This specification allows defining different semantics of metadata type 1=
 related mandatory context headers, but the NSH header does not convey that=
 semantic in the context headers. An SF MUST receive the data extraction sc=
hema first in order to get the data placed in the mandatory context headers=
. How an SF gets the data extraction schema for the mandatory context heade=
rs is outside the scope of this specification and the specification does no=
t make any assumption about the content placed in the mandatory context hea=
ders. Upon receiving an SFC packet with metadata type 1 present, if an SF d=
oes not yet receive the data extraction schema for the mandatory context he=
aders, it SHOULD process the packet as of no metadata and MUST log this err=
or.
>
> Add following text to control plane requirement doc.
>
> SFC encapsulation protocol [NSH] includes metadata type 1 with mandatory =
context headers that can be used to convey metadata along an SFC path. The =
protocol allows defining different semantics in the context headers but the=
 NSH header does not convey that semantics in the context header. The proto=
col requires an SF using the data placed in the MD#1 mandatory context head=
ers to use information external to the NSH data plane to understand the sem=
antics of the context data. Therefore, control plane solutions for SFC must=
 include capabilities to provide such context semantics, including any suit=
able scoping information about the scoping, to the SF.
>
> Will that acceptable? Comment and improvement suggestion are welcome.
>
> Regards,
> Lucy
>
>
>
>
> -----Original Message-----
> From: mohamed.boucadair@orange.com [mailto:mohamed.boucadair@orange.com]
> Sent: Wednesday, October 19, 2016 7:23 AM
> To: Lucy yong; Joel M. Halpern; Van De Velde, Gunter (Nokia - BE); Ron Pa=
rker; sfc@ietf.org
> Subject: RE: [sfc] metadata type 1 constraint
>
> Hi Lucy,
>
> I like your proposed text. Here is some minor modifications:
>
>
>    OLD:
>
>    NSH allows defining different semantics on MD#1 field but the NSH
>    header on an SFC packet does not convey the semantics on the MD#1
>    field.  For a SFC that uses MD#1, the control plane MUST define a
>    MD#1 semantics for the SFC, and it MUST inform the corresponding data
>    extraction scheme to individual SFs in the SFC that are required to
>    use data placed in the MD#1 field.  Note: two SFs in a SFC may use
>    same or different data placed in MD#1 field.
>
>    NEW:
>
>    This specification allows defining different semantics of MD#1
>    related mandatory context headers, but the NSH header does not convey
>    that semantic.  For an SFC-enabled domain that uses MD#1, the control
>    plane MUST communicate the semantic of the mandatory context headers
>    together with their scope (per chain, per domain, etc.) to the
>    underlying SFC-aware SFs.  Note that SFC-aware SFs in a given chain
>    may use the same or different data placed in MD#1 mandatory context
>    headers.  This document does not make any assumption about the data
>    to be conveyed in context headers nor whether the same data structure
>    is used along a given chain.  Those considerations are deployment-
>    specific.
>
> Cheers,
> Med
>
>> -----Message d'origine-----
>> De : sfc [mailto:sfc-bounces@ietf.org] De la part de Lucy yong Envoy=C3=
=A9
>> : mercredi 19 octobre 2016 13:53 =C3=80 : Joel M. Halpern; Van De Velde,
>> Gunter (Nokia - BE); Ron Parker; sfc@ietf.org Objet : Re: [sfc]
>> metadata type 1 constraint
>>
>> Hi Joel and all,
>>
>> Our current approach is to allow definition of allocation schemes, but
>> not to mandate any specific allocation scheme for MD-1.
>> [Lucy] In other words, NSH allows defining different semantics on MD#1
>> field but the NSH header on an SFC packet does not convey the
>> semantics on the MD#1 field. Thus, I propose adding this text to
>> section 3.4. - NSH allows defining different semantics on MD#1 field
>> but the NSH header on an SFC packet does not convey the semantics on
>> the MD#1 field. For a SFC that uses MD#1, the control plane MUST
>> define a MD#1 semantics for the SFC, and it MUST inform the
>> corresponding data extraction scheme to individual SFs in the SFC that a=
re required to use data placed in the MD#1 field. Note:
>> two SFs in a SFC may use same or different data placed in MD#1 field.
>> -
>>
>> That seems to me to be a good approach, workable, and what we have
>> agreed and documented.
>> [Lucy] Let's not reopen what has been agreed and documented and think
>> of what to add to address the interworking concern. Will above text help=
?
>>
>> Regards,
>> Lucy
>>
>>
>>
>> Yours,
>> Joel
>>
>> On 10/18/16 12:09 PM, Van De Velde, Gunter (Nokia - BE) wrote:
>> > If NSH MD Type-1 defines for the metadata to be Opaque, then we
>> > should
>> not make an effort to define it, and just tread it as Opaque content
>> imo and live with the consequences=E2=80=A6and in that case use MD Type-=
2 for
>> these types of well known metadata transport mechanisms.
>> >
>> > If however, we decide to define the allocation schemes, then we
>> > should
>> also architect an indicator for the used allocation scheme.
>> > At this point in time, there models were suggested (overload Length,
>> overload MD type, use few bits of MD context data).
>> > I strongly believe there is value in having the metadata allocation
>> structure signalled within the NSH itself, even for MD Type-1.
>> > (It avoids control plane signalling and creates state which needs to
>> > be
>> maintained, and that sounds as a very expensive operation).
>> >
>> > Alternate is to just say as Lucy suggests, and restrict MD Type-1
>> Service Chain SF=E2=80=99s per allocation scheme. This is a solution tha=
t
>> works, albeit it is a very impacting restriction for flexibility and
>> resource sharing).
>> >
>> > G/
>> >
>> >
>> > On 18/10/2016, 16:49, "sfc on behalf of Lucy yong"
>> > <sfc-bounces@ietf.org
>> on behalf of lucy.yong@huawei.com> wrote:
>> >
>> >     Comment on "Allocating a nibble or byte within the 32 bytes
>> (probably the first nibble or byte) is yet another."
>> >
>> >     Lucy: Technically We can do this on MD#1, but NSH already
>> > defines
>> MD#2. Is the variable length the only feature that hardware can't deal
>> with?
>> >
>> >     Lucy
>> >
>> >     -----Original Message-----
>> >     From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
>> >     Sent: Tuesday, October 18, 2016 10:05 AM
>> >     To: Lucy yong; Joel M. Halpern; sfc@ietf.org
>> >     Subject: RE: [sfc] metadata type 1 constraint
>> >
>> >     Even though the interpretation of metadata is dependent on
>> > control
>> plane interaction, where I think the original proposal has value is
>> that there might be multiple separate interpretations simultaneously wit=
hin the
>> same administrative domain.   A way to describe, on the wire, which of
>> those interpretations is in force for that particular SFP seems valuable
>> to me.   You could definitely argue that the control plane could install
>> the interpretation locally on a per SFP basis;  also being explicit on
>> the wire will likely enhance interoperability and debuggability.
>> >
>> >     The value would be locally significant within the administrative
>> domain (i.e., metadata schema 1, metatadata schema 2, etc.).   Overloadi=
ng
>> length is one way.   Overloading MD-type is another.   Allocating a nibb=
le
>> or byte within the 32 bytes (probably the first nibble or byte) is yet
>> another.
>> >
>> >        Ron
>> >
>> >
>> >     -----Original Message-----
>> >     From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Lucy yong
>> >     Sent: Tuesday, October 18, 2016 10:27 AM
>> >     To: Joel M. Halpern <jmh@joelhalpern.com>; sfc@ietf.org
>> >     Subject: Re: [sfc] metadata type 1 constraint
>> >
>> >     Joel,
>> >
>> >     Lucy, while your two text proposals are not wrong, I do not see
>> > them
>> as adding any clarity to the document.  The sections are very short
>> and clearly define only the syntax.
>> >     [Lucy] True. However, for this document, readers expect Section
>> > 3 to
>> describe NSH syntax and semantics. Section 3.1-3.3 do both. If section
>> 3.4 and 3.5 just specify the syntax, from documenting perspective, it
>> is important to explicitly state the two text out.
>> >
>> >     With regard to SF and MD-1 support, there is absolutely nothing
>> > that
>> requires an SF to support only one MD-1 structure.  Rather, the
>> control mechanisms will tell the SF how to extract the data it needs
>> from the MD-1 header.
>> >     [Lucy] This puts much uncertainty for a single SF on what to
>> implement, which causes people's concern. IMO, if we don't have a way
>> to address this challenge here (you stated in interim meeting),
>> pushing it to another place does not solve/address it. For example,
>> will the control mechanisms tell an SF how to extract the data it
>> needs from the MD-1 header per a SFP, or per a SFC, or for all SFC
>> packets, or per payload flow, or combination of them? This will
>> significantly impact SF implementation. The reason having MD type 1 is t=
hat is hardware friendly.
>> Leaving these uncertainty open, not sure if the reason still makes a
>> sense.
>> >
>> >     Lucy
>> >     I believe there is already text in the control plane
>> > requirements
>> document that describes the need for this control functionality.
>> >
>> >
>> >
>> >     Yours,
>> >     Joel
>> >
>> >     On 10/17/16 11:07 AM, Lucy yong wrote:
>> >     > Suggestions:
>> >     >
>> >     > Section 3.4 should mention that this section only defines MD
>> > type
>> 1
>> >     > format. The semantics of MD Type 1 is outside the scope of this
>> >     > document. Thus, the use of MD type 1 is outside the scope of thi=
s
>> >     > document.
>> >     >
>> >     > Section 3.5 should mention that this section only defines MEF
>> > type
>> 2
>> >     > format. The semantics of MD type 2 is outside the scope of this
>> >     > document. Thus, the use of MD type 2 is outside the scope of thi=
s
>> >     > documents.
>> >     >
>> >     > IMO: these statements are important for the sections.
>> >     >
>> >     > Joel, MD semantics is critical for SFs. More than one
>> > semantics of
>> MD
>> >     > type 1 MUST NOT be specified for a SF. This should be a
>> requirement in
>> >     > the SFC arch. as a result of NSH design's, but the architecture =
is
>> >     > already published. Maybe control plane requirement is the place =
to
>> >     > state this out as the result of SFC arch and NSH design.
>> >     >
>> >     > Thanks, Lucy
>> >     >
>> >     > -----Original Message----- From: sfc
>> > [mailto:sfc-bounces@ietf.org]
>> On
>> >     > Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:39
>> > PM
>> To:
>> >     > Lucy yong; sfc@ietf.org Subject: Re: [sfc] metadata type 1
>> constraint
>> >     >
>> >     > A) I woud not want to state any such constraint in the NSH
>> document,
>> >     > because B) In fact, the SFP ID is in every NSH header.  So
>> > yes,
>> there
>> >     > is context if it is needed
>> >     >
>> >     > It is true that MD-2 is more flexible than MD-1.  I don't
>> > think
>> anyone
>> >     > disagrees with that.
>> >     >
>> >     > Yours, Joel
>> >     >
>> >     > On 10/16/16 3:25 PM, Lucy yong wrote:
>> >     >> RFC7665 (SFC architecture) states  "This architecture allows
>> > an
>> SF to
>> >     >> be part of multiple SFPs and SFCs."
>> >     >>
>> >     >>
>> >     >>
>> >     >> NSH just specifies MD type1 with a 16 bytes field, and  NSH doc=
.
>> >     >> states
>> >     >>
>> >     >> 3.  NSH provides a mechanism to carry shared metadata between
>> >     >>
>> >     >> participating entities and service functions.  The semantics of
>> >     >>
>> >     >> the shared metadata is communicated via a control plane, which =
is
>> >     >>
>> >     >> outside the scope of this document, to participating nodes.
>> >     >>
>> >     >>
>> >     >>
>> >     >> Comments: this mean: when an SF that is part of multiple SFCs
>> > and
>> MD
>> >     >> type 1 is used in some of SFCs, these SFCs MUST have the same
>> >     >> metadata semantics.  This is because that NSH does not convey S=
FC
>> >     >> identifier. For MD type 2, different SFCs may insert
>> > different
>> list
>> >     >> of TLVs and each TLV has a type and specified semantics along
>> (the
>> >     >> TLVs will be specified in different doc.).
>> >     >>
>> >     >>
>> >     >>
>> >     >> Should we state out this constraint in NSH doc.
>> >     >>
>> >     >>
>> >     >>
>> >     >> Lucy
>> >     >>
>> >     >>
>> >     >>
>> >     >>
>> >     >>
>> >     >>
>> >     >>
>> >     >>
>> >     >>
>> >     >>
>> >     >>
>> >     >>
>> >     >>
>> >     >>
>> >     >>
>> >     >> _______________________________________________ sfc mailing lis=
t
>> >     >> sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc
>> >     >>
>> >     >
>> >     > _______________________________________________ sfc mailing list
>> >     > sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc
>> >     >
>> >
>> >     _______________________________________________
>> >     sfc mailing list
>> >     sfc@ietf.org
>> >     https://www.ietf.org/mailman/listinfo/sfc
>> >
>> >     _______________________________________________
>> >     sfc mailing list
>> >     sfc@ietf.org
>> >     https://www.ietf.org/mailman/listinfo/sfc
>> >
>> >
>> _______________________________________________
>> sfc mailing list
>> sfc@ietf.org
>> https://www.ietf.org/mailman/listinfo/sfc
> _______________________________________________
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From: Lucy yong <lucy.yong@huawei.com>
To: "sarikaya@ieee.org" <sarikaya@ieee.org>
Thread-Topic: [sfc] metadata type 1 constraint
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Date: Thu, 20 Oct 2016 16:41:00 +0000
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From: Behcet Sarikaya <sarikaya2012@gmail.com>
Date: Thu, 20 Oct 2016 15:17:19 -0500
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To: Lucy yong <lucy.yong@huawei.com>
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Subject: Re: [sfc] metadata type 1 constraint
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On Thu, Oct 20, 2016 at 11:41 AM, Lucy yong <lucy.yong@huawei.com> wrote:
> Hi Behcet,
>
> -----Original Message-----
> From: Behcet Sarikaya [mailto:sarikaya2012@gmail.com]
> Sent: Thursday, October 20, 2016 11:29 AM
> To: Lucy yong
> Cc: mohamed.boucadair@orange.com; Joel M. Halpern; Van De Velde, Gunter (=
Nokia - BE); Ron Parker; sfc@ietf.org
> Subject: Re: [sfc] metadata type 1 constraint
>
> Hi Lucy,
>
> Regarding semantics of metadata 1 and 2, that type of information should =
be defined separately in the documents defining any new metadata type 1 or =
2 and standardized, as we discussed during the interim.
> [Lucy] The key difference between two is that whatever information will b=
e defined for MD-1, it will not be carried in the NSH header.


Of course. That's why I am pointing to the document that defines the
metadata not the document that defines the so-called nsh protocol,
i.e.

draft-ietf-sfc-nsh.

Behcet

<span class=3D"sewbz6ae5c8iuox"><br></span>
> This is what WG agreed and documented. MD-2 is not.
>
> The nsh doc, only defines the syntax that should be used in defining so-c=
alled MD1 MD2.
> Specific metadata will be defined in other documents. The semantics refer=
s to what is to be defined in those documents.
> [Lucy] The text we proposed is for MD1. I think we will need some text fo=
r MD2 as well. But let's agree on the text for MD1 first.
>
> I just don't understand what is the point with these modifications you ar=
e proposing?
> [Lucy] It puts some requirements for SFC-aware SF implementation and cont=
rol plane solutions, which is important for the interworking.
>
> Lucy
>
> Behcet
>
> On Thu, Oct 20, 2016 at 10:44 AM, Lucy yong <lucy.yong@huawei.com> wrote:
>> Hi Med, et al,
>>
>> Joel, Andy Malis, and I had some offline discussions of the interworking=
 concern and what text should be added in NSH doc. and control plane requir=
ement doc. to address the concern. Here is the discussed text:
>>
>> Add following text in Section 3.4 of NSH doc.
>>
>> This specification allows defining different semantics of metadata type =
1 related mandatory context headers, but the NSH header does not convey tha=
t semantic in the context headers. An SF MUST receive the data extraction s=
chema first in order to get the data placed in the mandatory context header=
s. How an SF gets the data extraction schema for the mandatory context head=
ers is outside the scope of this specification and the specification does n=
ot make any assumption about the content placed in the mandatory context he=
aders. Upon receiving an SFC packet with metadata type 1 present, if an SF =
does not yet receive the data extraction schema for the mandatory context h=
eaders, it SHOULD process the packet as of no metadata and MUST log this er=
ror.
>>
>> Add following text to control plane requirement doc.
>>
>> SFC encapsulation protocol [NSH] includes metadata type 1 with mandatory=
 context headers that can be used to convey metadata along an SFC path. The=
 protocol allows defining different semantics in the context headers but th=
e NSH header does not convey that semantics in the context header. The prot=
ocol requires an SF using the data placed in the MD#1 mandatory context hea=
ders to use information external to the NSH data plane to understand the se=
mantics of the context data. Therefore, control plane solutions for SFC mus=
t include capabilities to provide such context semantics, including any sui=
table scoping information about the scoping, to the SF.
>>
>> Will that acceptable? Comment and improvement suggestion are welcome.
>>
>> Regards,
>> Lucy
>>
>>
>>
>>
>> -----Original Message-----
>> From: mohamed.boucadair@orange.com
>> [mailto:mohamed.boucadair@orange.com]
>> Sent: Wednesday, October 19, 2016 7:23 AM
>> To: Lucy yong; Joel M. Halpern; Van De Velde, Gunter (Nokia - BE); Ron
>> Parker; sfc@ietf.org
>> Subject: RE: [sfc] metadata type 1 constraint
>>
>> Hi Lucy,
>>
>> I like your proposed text. Here is some minor modifications:
>>
>>
>>    OLD:
>>
>>    NSH allows defining different semantics on MD#1 field but the NSH
>>    header on an SFC packet does not convey the semantics on the MD#1
>>    field.  For a SFC that uses MD#1, the control plane MUST define a
>>    MD#1 semantics for the SFC, and it MUST inform the corresponding data
>>    extraction scheme to individual SFs in the SFC that are required to
>>    use data placed in the MD#1 field.  Note: two SFs in a SFC may use
>>    same or different data placed in MD#1 field.
>>
>>    NEW:
>>
>>    This specification allows defining different semantics of MD#1
>>    related mandatory context headers, but the NSH header does not convey
>>    that semantic.  For an SFC-enabled domain that uses MD#1, the control
>>    plane MUST communicate the semantic of the mandatory context headers
>>    together with their scope (per chain, per domain, etc.) to the
>>    underlying SFC-aware SFs.  Note that SFC-aware SFs in a given chain
>>    may use the same or different data placed in MD#1 mandatory context
>>    headers.  This document does not make any assumption about the data
>>    to be conveyed in context headers nor whether the same data structure
>>    is used along a given chain.  Those considerations are deployment-
>>    specific.
>>
>> Cheers,
>> Med
>>
>>> -----Message d'origine-----
>>> De : sfc [mailto:sfc-bounces@ietf.org] De la part de Lucy yong Envoy=C3=
=A9
>>> : mercredi 19 octobre 2016 13:53 =C3=80 : Joel M. Halpern; Van De Velde=
,
>>> Gunter (Nokia - BE); Ron Parker; sfc@ietf.org Objet : Re: [sfc]
>>> metadata type 1 constraint
>>>
>>> Hi Joel and all,
>>>
>>> Our current approach is to allow definition of allocation schemes,
>>> but not to mandate any specific allocation scheme for MD-1.
>>> [Lucy] In other words, NSH allows defining different semantics on
>>> MD#1 field but the NSH header on an SFC packet does not convey the
>>> semantics on the MD#1 field. Thus, I propose adding this text to
>>> section 3.4. - NSH allows defining different semantics on MD#1 field
>>> but the NSH header on an SFC packet does not convey the semantics on
>>> the MD#1 field. For a SFC that uses MD#1, the control plane MUST
>>> define a MD#1 semantics for the SFC, and it MUST inform the
>>> corresponding data extraction scheme to individual SFs in the SFC that =
are required to use data placed in the MD#1 field. Note:
>>> two SFs in a SFC may use same or different data placed in MD#1 field.
>>> -
>>>
>>> That seems to me to be a good approach, workable, and what we have
>>> agreed and documented.
>>> [Lucy] Let's not reopen what has been agreed and documented and think
>>> of what to add to address the interworking concern. Will above text hel=
p?
>>>
>>> Regards,
>>> Lucy
>>>
>>>
>>>
>>> Yours,
>>> Joel
>>>
>>> On 10/18/16 12:09 PM, Van De Velde, Gunter (Nokia - BE) wrote:
>>> > If NSH MD Type-1 defines for the metadata to be Opaque, then we
>>> > should
>>> not make an effort to define it, and just tread it as Opaque content
>>> imo and live with the consequences=E2=80=A6and in that case use MD Type=
-2 for
>>> these types of well known metadata transport mechanisms.
>>> >
>>> > If however, we decide to define the allocation schemes, then we
>>> > should
>>> also architect an indicator for the used allocation scheme.
>>> > At this point in time, there models were suggested (overload
>>> > Length,
>>> overload MD type, use few bits of MD context data).
>>> > I strongly believe there is value in having the metadata allocation
>>> structure signalled within the NSH itself, even for MD Type-1.
>>> > (It avoids control plane signalling and creates state which needs
>>> > to be
>>> maintained, and that sounds as a very expensive operation).
>>> >
>>> > Alternate is to just say as Lucy suggests, and restrict MD Type-1
>>> Service Chain SF=E2=80=99s per allocation scheme. This is a solution th=
at
>>> works, albeit it is a very impacting restriction for flexibility and
>>> resource sharing).
>>> >
>>> > G/
>>> >
>>> >
>>> > On 18/10/2016, 16:49, "sfc on behalf of Lucy yong"
>>> > <sfc-bounces@ietf.org
>>> on behalf of lucy.yong@huawei.com> wrote:
>>> >
>>> >     Comment on "Allocating a nibble or byte within the 32 bytes
>>> (probably the first nibble or byte) is yet another."
>>> >
>>> >     Lucy: Technically We can do this on MD#1, but NSH already
>>> > defines
>>> MD#2. Is the variable length the only feature that hardware can't
>>> deal with?
>>> >
>>> >     Lucy
>>> >
>>> >     -----Original Message-----
>>> >     From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
>>> >     Sent: Tuesday, October 18, 2016 10:05 AM
>>> >     To: Lucy yong; Joel M. Halpern; sfc@ietf.org
>>> >     Subject: RE: [sfc] metadata type 1 constraint
>>> >
>>> >     Even though the interpretation of metadata is dependent on
>>> > control
>>> plane interaction, where I think the original proposal has value is
>>> that there might be multiple separate interpretations simultaneously wi=
thin the
>>> same administrative domain.   A way to describe, on the wire, which of
>>> those interpretations is in force for that particular SFP seems valuabl=
e
>>> to me.   You could definitely argue that the control plane could instal=
l
>>> the interpretation locally on a per SFP basis;  also being explicit
>>> on the wire will likely enhance interoperability and debuggability.
>>> >
>>> >     The value would be locally significant within the
>>> > administrative
>>> domain (i.e., metadata schema 1, metatadata schema 2, etc.).   Overload=
ing
>>> length is one way.   Overloading MD-type is another.   Allocating a nib=
ble
>>> or byte within the 32 bytes (probably the first nibble or byte) is
>>> yet another.
>>> >
>>> >        Ron
>>> >
>>> >
>>> >     -----Original Message-----
>>> >     From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Lucy yong
>>> >     Sent: Tuesday, October 18, 2016 10:27 AM
>>> >     To: Joel M. Halpern <jmh@joelhalpern.com>; sfc@ietf.org
>>> >     Subject: Re: [sfc] metadata type 1 constraint
>>> >
>>> >     Joel,
>>> >
>>> >     Lucy, while your two text proposals are not wrong, I do not see
>>> > them
>>> as adding any clarity to the document.  The sections are very short
>>> and clearly define only the syntax.
>>> >     [Lucy] True. However, for this document, readers expect Section
>>> > 3 to
>>> describe NSH syntax and semantics. Section 3.1-3.3 do both. If
>>> section
>>> 3.4 and 3.5 just specify the syntax, from documenting perspective, it
>>> is important to explicitly state the two text out.
>>> >
>>> >     With regard to SF and MD-1 support, there is absolutely nothing
>>> > that
>>> requires an SF to support only one MD-1 structure.  Rather, the
>>> control mechanisms will tell the SF how to extract the data it needs
>>> from the MD-1 header.
>>> >     [Lucy] This puts much uncertainty for a single SF on what to
>>> implement, which causes people's concern. IMO, if we don't have a way
>>> to address this challenge here (you stated in interim meeting),
>>> pushing it to another place does not solve/address it. For example,
>>> will the control mechanisms tell an SF how to extract the data it
>>> needs from the MD-1 header per a SFP, or per a SFC, or for all SFC
>>> packets, or per payload flow, or combination of them? This will
>>> significantly impact SF implementation. The reason having MD type 1 is =
that is hardware friendly.
>>> Leaving these uncertainty open, not sure if the reason still makes a
>>> sense.
>>> >
>>> >     Lucy
>>> >     I believe there is already text in the control plane
>>> > requirements
>>> document that describes the need for this control functionality.
>>> >
>>> >
>>> >
>>> >     Yours,
>>> >     Joel
>>> >
>>> >     On 10/17/16 11:07 AM, Lucy yong wrote:
>>> >     > Suggestions:
>>> >     >
>>> >     > Section 3.4 should mention that this section only defines MD
>>> > type
>>> 1
>>> >     > format. The semantics of MD Type 1 is outside the scope of this
>>> >     > document. Thus, the use of MD type 1 is outside the scope of th=
is
>>> >     > document.
>>> >     >
>>> >     > Section 3.5 should mention that this section only defines MEF
>>> > type
>>> 2
>>> >     > format. The semantics of MD type 2 is outside the scope of this
>>> >     > document. Thus, the use of MD type 2 is outside the scope of th=
is
>>> >     > documents.
>>> >     >
>>> >     > IMO: these statements are important for the sections.
>>> >     >
>>> >     > Joel, MD semantics is critical for SFs. More than one
>>> > semantics of
>>> MD
>>> >     > type 1 MUST NOT be specified for a SF. This should be a
>>> requirement in
>>> >     > the SFC arch. as a result of NSH design's, but the architecture=
 is
>>> >     > already published. Maybe control plane requirement is the place=
 to
>>> >     > state this out as the result of SFC arch and NSH design.
>>> >     >
>>> >     > Thanks, Lucy
>>> >     >
>>> >     > -----Original Message----- From: sfc
>>> > [mailto:sfc-bounces@ietf.org]
>>> On
>>> >     > Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:39
>>> > PM
>>> To:
>>> >     > Lucy yong; sfc@ietf.org Subject: Re: [sfc] metadata type 1
>>> constraint
>>> >     >
>>> >     > A) I woud not want to state any such constraint in the NSH
>>> document,
>>> >     > because B) In fact, the SFP ID is in every NSH header.  So
>>> > yes,
>>> there
>>> >     > is context if it is needed
>>> >     >
>>> >     > It is true that MD-2 is more flexible than MD-1.  I don't
>>> > think
>>> anyone
>>> >     > disagrees with that.
>>> >     >
>>> >     > Yours, Joel
>>> >     >
>>> >     > On 10/16/16 3:25 PM, Lucy yong wrote:
>>> >     >> RFC7665 (SFC architecture) states  "This architecture allows
>>> > an
>>> SF to
>>> >     >> be part of multiple SFPs and SFCs."
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >> NSH just specifies MD type1 with a 16 bytes field, and  NSH do=
c.
>>> >     >> states
>>> >     >>
>>> >     >> 3.  NSH provides a mechanism to carry shared metadata between
>>> >     >>
>>> >     >> participating entities and service functions.  The semantics o=
f
>>> >     >>
>>> >     >> the shared metadata is communicated via a control plane, which=
 is
>>> >     >>
>>> >     >> outside the scope of this document, to participating nodes.
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >> Comments: this mean: when an SF that is part of multiple
>>> > SFCs and
>>> MD
>>> >     >> type 1 is used in some of SFCs, these SFCs MUST have the same
>>> >     >> metadata semantics.  This is because that NSH does not convey =
SFC
>>> >     >> identifier. For MD type 2, different SFCs may insert
>>> > different
>>> list
>>> >     >> of TLVs and each TLV has a type and specified semantics
>>> > along
>>> (the
>>> >     >> TLVs will be specified in different doc.).
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >> Should we state out this constraint in NSH doc.
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >> Lucy
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >>
>>> >     >> _______________________________________________ sfc mailing li=
st
>>> >     >> sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc
>>> >     >>
>>> >     >
>>> >     > _______________________________________________ sfc mailing lis=
t
>>> >     > sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc
>>> >     >
>>> >
>>> >     _______________________________________________
>>> >     sfc mailing list
>>> >     sfc@ietf.org
>>> >     https://www.ietf.org/mailman/listinfo/sfc
>>> >
>>> >     _______________________________________________
>>> >     sfc mailing list
>>> >     sfc@ietf.org
>>> >     https://www.ietf.org/mailman/listinfo/sfc
>>> >
>>> >
>>> _______________________________________________
>>> sfc mailing list
>>> sfc@ietf.org
>>> https://www.ietf.org/mailman/listinfo/sfc
>> _______________________________________________
>> sfc mailing list
>> sfc@ietf.org
>> https://www.ietf.org/mailman/listinfo/sfc


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From: Lucy yong <lucy.yong@huawei.com>
To: "sarikaya@ieee.org" <sarikaya@ieee.org>
Thread-Topic: [sfc] metadata type 1 constraint
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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-offloads-03.txt
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From: <mohamed.boucadair@orange.com>
To: Lucy yong <lucy.yong@huawei.com>, "Joel M. Halpern" <jmh@joelhalpern.com>,  "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, "Ron Parker" <Ron_Parker@affirmednetworks.com>, "sfc@ietf.org" <sfc@ietf.org>
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From: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
To: "Paul Quinn (paulq)" <paulq@cisco.com>, "Joel M. Halpern" <jmh@joelhalpern.com>
Thread-Topic: [sfc] metadata type 1 constraint
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Date: Fri, 21 Oct 2016 12:33:39 +0000
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Subject: Re: [sfc] metadata type 1 constraint
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From: "Vigoureux, Martin (Nokia - FR)" <martin.vigoureux@nokia.com>
To: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, "Paul Quinn (paulq)" <paulq@cisco.com>, "Joel M. Halpern" <jmh@joelhalpern.com>
Thread-Topic: RE : [sfc] metadata type 1 constraint
Thread-Index: AQHSK5qDguT/TEWjcEWqkfXcRH6j5w==
Date: Fri, 21 Oct 2016 12:56:17 +0000
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Subject: Re: [sfc] metadata type 1 constraint
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>From the latest discussion I wonder if the allocation drafts shouldn't in f=
act define their own MD type (3, 4, ...).

If there is a need/use for that, a TLV for framing these MDs in MD2 could b=
e defined, as sfc-nsh-tlv now does.

I'd in any case prefer to avoid duplicating specifications across documents=
, and as such sfc-nsh-tlv should only reference the encodings, not replicat=
e them.

-m


-------- Message d'origine --------
De : "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
Date :21/10/2016 14:36 (GMT+01:00)
=C0 : "Paul Quinn (paulq)" <paulq@cisco.com>, "Joel M. Halpern" <jmh@joelha=
lpern.com>
Cc : sfc@ietf.org
Objet : Re: [sfc] metadata type 1 constraint

The good news is that draft draft-quinn-sfc-nsh-tlv-02.txt now has a fix su=
ggesting context allocation scheme encoding:

https://tools.ietf.org/rfcdiff?
  url1=3Dhttps://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-01.txt
  &url2=3Dhttps://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-02.txt

However, if the intent is that MD#1 is Opaque, then why even try to suggest=
 encodings for it? Opaque info is opaque info=85 either you define it, or y=
ou do not define it=85 anything else is confusing and contradicting from op=
erational and implementation perspective.

I would prefer to see that both =93Data Center Allocation=94 and =93Mobilit=
y/Broadband Allocation=94 drafts are written with intended main usage in a =
MD#2, instead of MD#1 as then it is a complete and interoperable allocation=
 scheme usage with significantly reduced operational overhead and restricti=
ons. Assuming the length of these allocation blobs fixed at 16 octets for p=
otentially stuffing them in a MD#1 sounds fine.

G/



On 19/10/2016, 17:22, "sfc on behalf of Van De Velde, Gunter (Nokia - BE)" =
<sfc-bounces@ietf.org on behalf of gunter.van_de_velde@nokia.com> wrote:

    It is sad that we significantly increase the operational burden for all=
ocation scheme signalling for MD#1. I am dazzled the WG believes stateful s=
ignalling is easier for deployment compared with a stateless solution for M=
D#1. The imposed operational complexity is significant with current proposa=
l.

    G/




    On 19/10/2016, 15:33, "sfc on behalf of Paul Quinn (paulq)" <sfc-bounce=
s@ietf.org on behalf of paulq@cisco.com> wrote:

        Joel,

        I agree with you: the current approach is simple and workable.  The=
 allocation scheme are simply information examples.

        Paul

        > On Oct 18, 2016, at 8:14 PM, Joel M. Halpern <jmh@joelhalpern.com=
> wrote:
        >
        > Our current approach is to allow definition of allocation schemes=
, but not to mandate any specific allocation scheme for MD-1.
        > That seems to me to be a good approach, workable, and what we hav=
e agreed and documented.
        >
        > Yours,
        > Joel
        >
        > On 10/18/16 12:09 PM, Van De Velde, Gunter (Nokia - BE) wrote:
        >> If NSH MD Type-1 defines for the metadata to be Opaque, then we =
should not make an effort to define it, and just tread it as Opaque content=
 imo and live with the consequences=85and in that case use MD Type-2 for th=
ese types of well known metadata transport mechanisms.
        >>
        >> If however, we decide to define the allocation schemes, then we =
should also architect an indicator for the used allocation scheme.
        >> At this point in time, there models were suggested (overload Len=
gth, overload MD type, use few bits of MD context data).
        >> I strongly believe there is value in having the metadata allocat=
ion structure signalled within the NSH itself, even for MD Type-1.
        >> (It avoids control plane signalling and creates state which need=
s to be maintained, and that sounds as a very expensive operation).
        >>
        >> Alternate is to just say as Lucy suggests, and restrict MD Type-=
1 Service Chain SF=92s per allocation scheme. This is a solution that works=
, albeit it is a very impacting restriction for flexibility and resource sh=
aring).
        >>
        >> G/
        >>
        >>
        >> On 18/10/2016, 16:49, "sfc on behalf of Lucy yong" <sfc-bounces@=
ietf.org on behalf of lucy.yong@huawei.com> wrote:
        >>
        >>    Comment on "Allocating a nibble or byte within the 32 bytes (=
probably the first nibble or byte) is yet another."
        >>
        >>    Lucy: Technically We can do this on MD#1, but NSH already def=
ines MD#2. Is the variable length the only feature that hardware can't deal=
 with?
        >>
        >>    Lucy
        >>
        >>    -----Original Message-----
        >>    From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
        >>    Sent: Tuesday, October 18, 2016 10:05 AM
        >>    To: Lucy yong; Joel M. Halpern; sfc@ietf.org
        >>    Subject: RE: [sfc] metadata type 1 constraint
        >>
        >>    Even though the interpretation of metadata is dependent on co=
ntrol plane interaction, where I think the original proposal has value is t=
hat there might be multiple separate interpretations simultaneously within =
the same administrative domain.   A way to describe, on the wire, which of =
those interpretations is in force for that particular SFP seems valuable to=
 me.   You could definitely argue that the control plane could install the =
interpretation locally on a per SFP basis;  also being explicit on the wire=
 will likely enhance interoperability and debuggability.
        >>
        >>    The value would be locally significant within the administrat=
ive domain (i.e., metadata schema 1, metatadata schema 2, etc.).   Overload=
ing length is one way.   Overloading MD-type is another.   Allocating a nib=
ble or byte within the 32 bytes (probably the first nibble or byte) is yet =
another.
        >>
        >>       Ron
        >>
        >>
        >>    -----Original Message-----
        >>    From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Lucy yon=
g
        >>    Sent: Tuesday, October 18, 2016 10:27 AM
        >>    To: Joel M. Halpern <jmh@joelhalpern.com>; sfc@ietf.org
        >>    Subject: Re: [sfc] metadata type 1 constraint
        >>
        >>    Joel,
        >>
        >>    Lucy, while your two text proposals are not wrong, I do not s=
ee them as adding any clarity to the document.  The sections are very short=
 and clearly define only the syntax.
        >>    [Lucy] True. However, for this document, readers expect Secti=
on 3 to describe NSH syntax and semantics. Section 3.1-3.3 do both. If sect=
ion 3.4 and 3.5 just specify the syntax, from documenting perspective, it i=
s important to explicitly state the two text out.
        >>
        >>    With regard to SF and MD-1 support, there is absolutely nothi=
ng that requires an SF to support only one MD-1 structure.  Rather, the con=
trol mechanisms will tell the SF how to extract the data it needs from the =
MD-1 header.
        >>    [Lucy] This puts much uncertainty for a single SF on what to =
implement, which causes people's concern. IMO, if we don't have a way to ad=
dress this challenge here (you stated in interim meeting), pushing it to an=
other place does not solve/address it. For example,  will the control mecha=
nisms tell an SF how to extract the data it needs from the MD-1 header per =
a SFP, or per a SFC, or for all SFC packets, or per payload flow, or combin=
ation of them? This will significantly impact SF implementation. The reason=
 having MD type 1 is that is hardware friendly. Leaving these uncertainty o=
pen, not sure if the reason still makes a sense.
        >>
        >>    Lucy
        >>    I believe there is already text in the control plane requirem=
ents document that describes the need for this control functionality.
        >>
        >>
        >>
        >>    Yours,
        >>    Joel
        >>
        >>    On 10/17/16 11:07 AM, Lucy yong wrote:
        >>    > Suggestions:
        >>    >
        >>    > Section 3.4 should mention that this section only defines M=
D type 1
        >>    > format. The semantics of MD Type 1 is outside the scope of =
this
        >>    > document. Thus, the use of MD type 1 is outside the scope o=
f this
        >>    > document.
        >>    >
        >>    > Section 3.5 should mention that this section only defines M=
EF type 2
        >>    > format. The semantics of MD type 2 is outside the scope of =
this
        >>    > document. Thus, the use of MD type 2 is outside the scope o=
f this
        >>    > documents.
        >>    >
        >>    > IMO: these statements are important for the sections.
        >>    >
        >>    > Joel, MD semantics is critical for SFs. More than one seman=
tics of MD
        >>    > type 1 MUST NOT be specified for a SF. This should be a req=
uirement in
        >>    > the SFC arch. as a result of NSH design's, but the architec=
ture is
        >>    > already published. Maybe control plane requirement is the p=
lace to
        >>    > state this out as the result of SFC arch and NSH design.
        >>    >
        >>    > Thanks, Lucy
        >>    >
        >>    > -----Original Message----- From: sfc [mailto:sfc-bounces@ie=
tf.org] On
        >>    > Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:=
39 PM To:
        >>    > Lucy yong; sfc@ietf.org Subject: Re: [sfc] metadata type 1 =
constraint
        >>    >
        >>    > A) I woud not want to state any such constraint in the NSH =
document,
        >>    > because B) In fact, the SFP ID is in every NSH header.  So =
yes, there
        >>    > is context if it is needed
        >>    >
        >>    > It is true that MD-2 is more flexible than MD-1.  I don't t=
hink anyone
        >>    > disagrees with that.
        >>    >
        >>    > Yours, Joel
        >>    >
        >>    > On 10/16/16 3:25 PM, Lucy yong wrote:
        >>    >> RFC7665 (SFC architecture) states  "This architecture allo=
ws an SF to
        >>    >> be part of multiple SFPs and SFCs."
        >>    >>
        >>    >>
        >>    >>
        >>    >> NSH just specifies MD type1 with a 16 bytes field, and  NS=
H doc.
        >>    >> states
        >>    >>
        >>    >> 3.  NSH provides a mechanism to carry shared metadata betw=
een
        >>    >>
        >>    >> participating entities and service functions.  The semanti=
cs of
        >>    >>
        >>    >> the shared metadata is communicated via a control plane, w=
hich is
        >>    >>
        >>    >> outside the scope of this document, to participating nodes=
.
        >>    >>
        >>    >>
        >>    >>
        >>    >> Comments: this mean: when an SF that is part of multiple S=
FCs and MD
        >>    >> type 1 is used in some of SFCs, these SFCs MUST have the s=
ame
        >>    >> metadata semantics.  This is because that NSH does not con=
vey SFC
        >>    >> identifier. For MD type 2, different SFCs may insert diffe=
rent list
        >>    >> of TLVs and each TLV has a type and specified semantics al=
ong (the
        >>    >> TLVs will be specified in different doc.).
        >>    >>
        >>    >>
        >>    >>
        >>    >> Should we state out this constraint in NSH doc.
        >>    >>
        >>    >>
        >>    >>
        >>    >> Lucy
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >> _______________________________________________ sfc mailin=
g list
        >>    >> sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc
        >>    >>
        >>    >
        >>    > _______________________________________________ sfc mailing=
 list
        >>    > sfc@ietf.org https://www.ietf.org/mailman/listinfo/sfc
        >>    >
        >>
        >>    _______________________________________________
        >>    sfc mailing list
        >>    sfc@ietf.org
        >>    https://www.ietf.org/mailman/listinfo/sfc
        >>
        >>    _______________________________________________
        >>    sfc mailing list
        >>    sfc@ietf.org
        >>    https://www.ietf.org/mailman/listinfo/sfc
        >>
        >>
        >
        > _______________________________________________
        > sfc mailing list
        > sfc@ietf.org
        > https://www.ietf.org/mailman/listinfo/sfc

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<div>
<div style=3D"">From the latest discussion I wonder if the allocation draft=
s shouldn't in fact define their own MD type (3, 4, ...).<br>
<br>
If there is a need/use for that, a TLV for framing these MDs in MD2 could b=
e defined, as sfc-nsh-tlv now does.<br>
<br>
I'd in any case prefer to avoid duplicating specifications across documents=
, and as such sfc-nsh-tlv should only reference the encodings, not replicat=
e them.<br>
<br>
-m<br>
</div>
<br>
<br>
-------- Message d'origine --------<br>
De : &quot;Van De Velde, Gunter (Nokia - BE)&quot; &lt;gunter.van_de_velde@=
nokia.com&gt; <br>
Date :21/10/2016 14:36 (GMT&#43;01:00) <br>
=C0 : &quot;Paul Quinn (paulq)&quot; &lt;paulq@cisco.com&gt;, &quot;Joel M.=
 Halpern&quot; &lt;jmh@joelhalpern.com&gt;
<br>
Cc : sfc@ietf.org <br>
Objet : Re: [sfc] metadata type 1 constraint <br>
<br>
</div>
<font size=3D"2"><span style=3D"font-size:10pt;">
<div class=3D"PlainText">The good news is that draft draft-quinn-sfc-nsh-tl=
v-02.txt now has a fix suggesting context allocation scheme encoding:<br>
<br>
<a href=3D"https://tools.ietf.org/rfcdiff?">https://tools.ietf.org/rfcdiff?=
</a><br>
&nbsp; url1=3Dhttps://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-01.txt<br>
&nbsp; &amp;url2=3Dhttps://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-02.txt=
<br>
<br>
However, if the intent is that MD#1 is Opaque, then why even try to suggest=
 encodings for it? Opaque info is opaque info=85 either you define it, or y=
ou do not define it=85 anything else is confusing and contradicting from op=
erational and implementation perspective.<br>
<br>
I would prefer to see that both =93Data Center Allocation=94 and =93Mobilit=
y/Broadband Allocation=94 drafts are written with intended main usage in a =
MD#2, instead of MD#1 as then it is a complete and interoperable allocation=
 scheme usage with significantly reduced
 operational overhead and restrictions. Assuming the length of these alloca=
tion blobs fixed at 16 octets for potentially stuffing them in a MD#1 sound=
s fine.
<br>
<br>
G/<br>
<br>
<br>
<br>
On 19/10/2016, 17:22, &quot;sfc on behalf of Van De Velde, Gunter (Nokia - =
BE)&quot; &lt;sfc-bounces@ietf.org on behalf of gunter.van_de_velde@nokia.c=
om&gt; wrote:<br>
<br>
&nbsp;&nbsp;&nbsp; It is sad that we significantly increase the operational=
 burden for allocation scheme signalling for MD#1. I am dazzled the WG beli=
eves stateful signalling is easier for deployment compared with a stateless=
 solution for MD#1. The imposed operational complexity
 is significant with current proposal.<br>
&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; G/<br>
&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; On 19/10/2016, 15:33, &quot;sfc on behalf of Paul Quinn =
(paulq)&quot; &lt;sfc-bounces@ietf.org on behalf of paulq@cisco.com&gt; wro=
te:<br>
&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Joel,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I agree with you: the current ap=
proach is simple and workable.&nbsp; The allocation scheme are simply infor=
mation examples.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Paul<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; On Oct 18, 2016, at 8:14 PM=
, Joel M. Halpern &lt;jmh@joelhalpern.com&gt; wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Our current approach is to =
allow definition of allocation schemes, but not to mandate any specific all=
ocation scheme for MD-1.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; That seems to me to be a go=
od approach, workable, and what we have agreed and documented.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Yours,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Joel<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; On 10/18/16 12:09 PM, Van D=
e Velde, Gunter (Nokia - BE) wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; If NSH MD Type-1 define=
s for the metadata to be Opaque, then we should not make an effort to defin=
e it, and just tread it as Opaque content imo and live with the consequence=
s=85and in that case use MD Type-2 for these types of well known metadata t=
ransport
 mechanisms.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; If however, we decide t=
o define the allocation schemes, then we should also architect an indicator=
 for the used allocation scheme.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; At this point in time, =
there models were suggested (overload Length, overload MD type, use few bit=
s of MD context data).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; I strongly believe ther=
e is value in having the metadata allocation structure signalled within the=
 NSH itself, even for MD Type-1.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; (It avoids control plan=
e signalling and creates state which needs to be maintained, and that sound=
s as a very expensive operation).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; Alternate is to just sa=
y as Lucy suggests, and restrict MD Type-1 Service Chain SF=92s per allocat=
ion scheme. This is a solution that works, albeit it is a very impacting re=
striction for flexibility and resource sharing).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; G/<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; On 18/10/2016, 16:49, &=
quot;sfc on behalf of Lucy yong&quot; &lt;sfc-bounces@ietf.org on behalf of=
 lucy.yong@huawei.com&gt; wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Comme=
nt on &quot;Allocating a nibble or byte within the 32 bytes (probably the f=
irst nibble or byte) is yet another.&quot;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy:=
 Technically We can do this on MD#1, but NSH already defines MD#2. Is the v=
ariable length the only feature that hardware can't deal with?<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; -----=
Original Message-----<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; From:=
 Ron Parker [<a href=3D"mailto:Ron_Parker@affirmednetworks.com">mailto:Ron_=
Parker@affirmednetworks.com</a>]<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Sent:=
 Tuesday, October 18, 2016 10:05 AM<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; To: L=
ucy yong; Joel M. Halpern; sfc@ietf.org<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Subje=
ct: RE: [sfc] metadata type 1 constraint<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Even =
though the interpretation of metadata is dependent on control plane interac=
tion, where I think the original proposal has value is that there might be =
multiple separate interpretations simultaneously within the same administra=
tive domain.&nbsp;&nbsp;
 A way to describe, on the wire, which of those interpretations is in force=
 for that particular SFP seems valuable to me.&nbsp;&nbsp; You could defini=
tely argue that the control plane could install the interpretation locally =
on a per SFP basis;&nbsp; also being explicit on
 the wire will likely enhance interoperability and debuggability.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; The v=
alue would be locally significant within the administrative domain (i.e., m=
etadata schema 1, metatadata schema 2, etc.).&nbsp;&nbsp; Overloading lengt=
h is one way.&nbsp;&nbsp; Overloading MD-type is another.&nbsp;&nbsp; Alloc=
ating a nibble or byte within the 32 bytes
 (probably the first nibble or byte) is yet another.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; Ron<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; -----=
Original Message-----<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; From:=
 sfc [<a href=3D"mailto:sfc-bounces@ietf.org">mailto:sfc-bounces@ietf.org</=
a>] On Behalf Of Lucy yong<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Sent:=
 Tuesday, October 18, 2016 10:27 AM<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; To: J=
oel M. Halpern &lt;jmh@joelhalpern.com&gt;; sfc@ietf.org<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Subje=
ct: Re: [sfc] metadata type 1 constraint<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Joel,=
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy,=
 while your two text proposals are not wrong, I do not see them as adding a=
ny clarity to the document.&nbsp; The sections are very short and clearly d=
efine only the syntax.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; [Lucy=
] True. However, for this document, readers expect Section 3 to describe NS=
H syntax and semantics. Section 3.1-3.3 do both. If section 3.4 and 3.5 jus=
t specify the syntax, from documenting perspective, it is important to expl=
icitly state
 the two text out.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; With =
regard to SF and MD-1 support, there is absolutely nothing that requires an=
 SF to support only one MD-1 structure.&nbsp; Rather, the control mechanism=
s will tell the SF how to extract the data it needs from the MD-1 header.<b=
r>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; [Lucy=
] This puts much uncertainty for a single SF on what to implement, which ca=
uses people's concern. IMO, if we don't have a way to address this challeng=
e here (you stated in interim meeting), pushing it to another place does no=
t solve/address
 it. For example,&nbsp; will the control mechanisms tell an SF how to extra=
ct the data it needs from the MD-1 header per a SFP, or per a SFC, or for a=
ll SFC packets, or per payload flow, or combination of them? This will sign=
ificantly impact SF implementation. The
 reason having MD type 1 is that is hardware friendly. Leaving these uncert=
ainty open, not sure if the reason still makes a sense.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; I bel=
ieve there is already text in the control plane requirements document that =
describes the need for this control functionality.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Yours=
,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Joel<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; On 10=
/17/16 11:07 AM, Lucy yong wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Suggestions:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Section 3.4 should mention that this section only defines MD type 1<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
format. The semantics of MD Type 1 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
document. Thus, the use of MD type 1 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
document.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Section 3.5 should mention that this section only defines MEF type 2<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
format. The semantics of MD type 2 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
document. Thus, the use of MD type 2 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
documents.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
IMO: these statements are important for the sections.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Joel, MD semantics is critical for SFs. More than one semantics of MD<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
type 1 MUST NOT be specified for a SF. This should be a requirement in<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
the SFC arch. as a result of NSH design's, but the architecture is<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
already published. Maybe control plane requirement is the place to<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
state this out as the result of SFC arch and NSH design.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Thanks, Lucy<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
-----Original Message----- From: sfc [<a href=3D"mailto:sfc-bounces@ietf.or=
g">mailto:sfc-bounces@ietf.org</a>] On<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:39 PM To:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Lucy yong; sfc@ietf.org Subject: Re: [sfc] metadata type 1 constraint<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
A) I woud not want to state any such constraint in the NSH document,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
because B) In fact, the SFP ID is in every NSH header.&nbsp; So yes, there<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
is context if it is needed<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
It is true that MD-2 is more flexible than MD-1.&nbsp; I don't think anyone=
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
disagrees with that.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Yours, Joel<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
On 10/16/16 3:25 PM, Lucy yong wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; RFC7665 (SFC architecture) states&nbsp; &quot;This architecture allows =
an SF to<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; be part of multiple SFPs and SFCs.&quot;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; NSH just specifies MD type1 with a 16 bytes field, and&nbsp; NSH doc.<b=
r>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; states<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; 3.&nbsp; NSH provides a mechanism to carry shared metadata between<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; participating entities and service functions.&nbsp; The semantics of<br=
>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; the shared metadata is communicated via a control plane, which is<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; outside the scope of this document, to participating nodes.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; Comments: this mean: when an SF that is part of multiple SFCs and MD<br=
>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; type 1 is used in some of SFCs, these SFCs MUST have the same<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; metadata semantics.&nbsp; This is because that NSH does not convey SFC<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; identifier. For MD type 2, different SFCs may insert different list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; of TLVs and each TLV has a type and specified semantics along (the<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; TLVs will be specified in different doc.).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; Should we state out this constraint in NSH doc.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; Lucy<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; _______________________________________________ sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; sfc@ietf.org <a href=3D"https://www.ietf.org/mailman/listinfo/sfc">
https://www.ietf.org/mailman/listinfo/sfc</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
_______________________________________________ sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
sfc@ietf.org <a href=3D"https://www.ietf.org/mailman/listinfo/sfc">
https://www.ietf.org/mailman/listinfo/sfc</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; _____=
__________________________________________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; sfc m=
ailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; sfc@i=
etf.org<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; <a hr=
ef=3D"https://www.ietf.org/mailman/listinfo/sfc">https://www.ietf.org/mailm=
an/listinfo/sfc</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; _____=
__________________________________________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; sfc m=
ailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; sfc@i=
etf.org<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; <a hr=
ef=3D"https://www.ietf.org/mailman/listinfo/sfc">https://www.ietf.org/mailm=
an/listinfo/sfc</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; ___________________________=
____________________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; sfc@ietf.org<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; <a href=3D"https://www.ietf=
.org/mailman/listinfo/sfc">https://www.ietf.org/mailman/listinfo/sfc</a><br=
>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ________________________________=
_______________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; sfc@ietf.org<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"https://www.ietf.org/=
mailman/listinfo/sfc">https://www.ietf.org/mailman/listinfo/sfc</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; _______________________________________________<br>
&nbsp;&nbsp;&nbsp; sfc mailing list<br>
&nbsp;&nbsp;&nbsp; sfc@ietf.org<br>
&nbsp;&nbsp;&nbsp; <a href=3D"https://www.ietf.org/mailman/listinfo/sfc">ht=
tps://www.ietf.org/mailman/listinfo/sfc</a><br>
&nbsp;&nbsp;&nbsp; <br>
<br>
_______________________________________________<br>
sfc mailing list<br>
sfc@ietf.org<br>
<a href=3D"https://www.ietf.org/mailman/listinfo/sfc">https://www.ietf.org/=
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From: "Jim Guichard (jguichar)" <jguichar@cisco.com>
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Thread-Topic: Call for Seoul SFC WG Agenda Topics
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From: "Jim Guichard (jguichar)" <jguichar@cisco.com>
To: "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: SFC Virtual Interim 10/14 Minutes
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From: Lucy yong <lucy.yong@huawei.com>
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Date: Fri, 21 Oct 2016 16:02:05 +0000
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From: Lucy yong <lucy.yong@huawei.com>
To: "Vigoureux, Martin (Nokia - FR)" <martin.vigoureux@nokia.com>, "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, "Paul Quinn (paulq)" <paulq@cisco.com>, "Joel M. Halpern" <jmh@joelhalpern.com>
Thread-Topic: [sfc] metadata type 1 constraint
Thread-Index: AdIn4xLyjD6K0BeCTVKJAwYgCy2h8QEB1IZQ
Date: Fri, 21 Oct 2016 22:48:56 +0000
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Subject: Re: [sfc] metadata type 1 constraint
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If we intend to standardize metadata structure per an SFC application, I wo=
nder why NSH needs MD#1? MD#2 can support all SFC needs. MD#2 even support =
expert review metadata class, experimental metadata class as well. Should c=
onsider removing MD#1?

Lucy

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Vigoureux, Martin (Nok=
ia - FR)
Sent: Friday, October 21, 2016 7:56 AM
To: Van De Velde, Gunter (Nokia - BE); Paul Quinn (paulq); Joel M. Halpern
Cc: sfc@ietf.org
Subject: Re: [sfc] metadata type 1 constraint

>From the latest discussion I wonder if the allocation drafts shouldn't in f=
act define their own MD type (3, 4, ...).

If there is a need/use for that, a TLV for framing these MDs in MD2 could b=
e defined, as sfc-nsh-tlv now does.

I'd in any case prefer to avoid duplicating specifications across documents=
, and as such sfc-nsh-tlv should only reference the encodings, not replicat=
e them.

-m


-------- Message d'origine --------
De : "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com<mai=
lto:gunter.van_de_velde@nokia.com>>
Date :21/10/2016 14:36 (GMT+01:00)
=C0 : "Paul Quinn (paulq)" <paulq@cisco.com<mailto:paulq@cisco.com>>, "Joel=
 M. Halpern" <jmh@joelhalpern.com<mailto:jmh@joelhalpern.com>>
Cc : sfc@ietf.org<mailto:sfc@ietf.org>
Objet : Re: [sfc] metadata type 1 constraint
The good news is that draft draft-quinn-sfc-nsh-tlv-02.txt now has a fix su=
ggesting context allocation scheme encoding:

https://tools.ietf.org/rfcdiff?
  url1=3Dhttps://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-01.txt
  &url2=3Dhttps://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-02.txt

However, if the intent is that MD#1 is Opaque, then why even try to suggest=
 encodings for it? Opaque info is opaque info... either you define it, or y=
ou do not define it... anything else is confusing and contradicting from op=
erational and implementation perspective.

I would prefer to see that both "Data Center Allocation" and "Mobility/Broa=
dband Allocation" drafts are written with intended main usage in a MD#2, in=
stead of MD#1 as then it is a complete and interoperable allocation scheme =
usage with significantly reduced operational overhead and restrictions. Ass=
uming the length of these allocation blobs fixed at 16 octets for potential=
ly stuffing them in a MD#1 sounds fine.

G/



On 19/10/2016, 17:22, "sfc on behalf of Van De Velde, Gunter (Nokia - BE)" =
<sfc-bounces@ietf.org on behalf of gunter.van_de_velde@nokia.com<mailto:sfc=
-bounces@ietf.org%20on%20behalf%20of%20gunter.van_de_velde@nokia.com>> wrot=
e:

    It is sad that we significantly increase the operational burden for all=
ocation scheme signalling for MD#1. I am dazzled the WG believes stateful s=
ignalling is easier for deployment compared with a stateless solution for M=
D#1. The imposed operational complexity is significant with current proposa=
l.

    G/




    On 19/10/2016, 15:33, "sfc on behalf of Paul Quinn (paulq)" <sfc-bounce=
s@ietf.org on behalf of paulq@cisco.com<mailto:sfc-bounces@ietf.org%20on%20=
behalf%20of%20paulq@cisco.com>> wrote:

        Joel,

        I agree with you: the current approach is simple and workable.  The=
 allocation scheme are simply information examples.

        Paul

        > On Oct 18, 2016, at 8:14 PM, Joel M. Halpern <jmh@joelhalpern.com=
<mailto:jmh@joelhalpern.com>> wrote:
        >
        > Our current approach is to allow definition of allocation schemes=
, but not to mandate any specific allocation scheme for MD-1.
        > That seems to me to be a good approach, workable, and what we hav=
e agreed and documented.
        >
        > Yours,
        > Joel
        >
        > On 10/18/16 12:09 PM, Van De Velde, Gunter (Nokia - BE) wrote:
        >> If NSH MD Type-1 defines for the metadata to be Opaque, then we =
should not make an effort to define it, and just tread it as Opaque content=
 imo and live with the consequences...and in that case use MD Type-2 for th=
ese types of well known metadata transport mechanisms.
        >>
        >> If however, we decide to define the allocation schemes, then we =
should also architect an indicator for the used allocation scheme.
        >> At this point in time, there models were suggested (overload Len=
gth, overload MD type, use few bits of MD context data).
        >> I strongly believe there is value in having the metadata allocat=
ion structure signalled within the NSH itself, even for MD Type-1.
        >> (It avoids control plane signalling and creates state which need=
s to be maintained, and that sounds as a very expensive operation).
        >>
        >> Alternate is to just say as Lucy suggests, and restrict MD Type-=
1 Service Chain SF's per allocation scheme. This is a solution that works, =
albeit it is a very impacting restriction for flexibility and resource shar=
ing).
        >>
        >> G/
        >>
        >>
        >> On 18/10/2016, 16:49, "sfc on behalf of Lucy yong" <sfc-bounces@=
ietf.org on behalf of lucy.yong@huawei.com<mailto:sfc-bounces@ietf.org%20on=
%20behalf%20of%20lucy.yong@huawei.com>> wrote:
        >>
        >>    Comment on "Allocating a nibble or byte within the 32 bytes (=
probably the first nibble or byte) is yet another."
        >>
        >>    Lucy: Technically We can do this on MD#1, but NSH already def=
ines MD#2. Is the variable length the only feature that hardware can't deal=
 with?
        >>
        >>    Lucy
        >>
        >>    -----Original Message-----
        >>    From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
        >>    Sent: Tuesday, October 18, 2016 10:05 AM
        >>    To: Lucy yong; Joel M. Halpern; sfc@ietf.org<mailto:sfc@ietf.=
org>
        >>    Subject: RE: [sfc] metadata type 1 constraint
        >>
        >>    Even though the interpretation of metadata is dependent on co=
ntrol plane interaction, where I think the original proposal has value is t=
hat there might be multiple separate interpretations simultaneously within =
the same administrative domain.   A way to describe, on the wire, which of =
those interpretations is in force for that particular SFP seems valuable to=
 me.   You could definitely argue that the control plane could install the =
interpretation locally on a per SFP basis;  also being explicit on the wire=
 will likely enhance interoperability and debuggability.
        >>
        >>    The value would be locally significant within the administrat=
ive domain (i.e., metadata schema 1, metatadata schema 2, etc.).   Overload=
ing length is one way.   Overloading MD-type is another.   Allocating a nib=
ble or byte within the 32 bytes (probably the first nibble or byte) is yet =
another.
        >>
        >>       Ron
        >>
        >>
        >>    -----Original Message-----
        >>    From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Lucy yon=
g
        >>    Sent: Tuesday, October 18, 2016 10:27 AM
        >>    To: Joel M. Halpern <jmh@joelhalpern.com<mailto:jmh@joelhalpe=
rn.com>>; sfc@ietf.org<mailto:sfc@ietf.org>
        >>    Subject: Re: [sfc] metadata type 1 constraint
        >>
        >>    Joel,
        >>
        >>    Lucy, while your two text proposals are not wrong, I do not s=
ee them as adding any clarity to the document.  The sections are very short=
 and clearly define only the syntax.
        >>    [Lucy] True. However, for this document, readers expect Secti=
on 3 to describe NSH syntax and semantics. Section 3.1-3.3 do both. If sect=
ion 3.4 and 3.5 just specify the syntax, from documenting perspective, it i=
s important to explicitly state the two text out.
        >>
        >>    With regard to SF and MD-1 support, there is absolutely nothi=
ng that requires an SF to support only one MD-1 structure.  Rather, the con=
trol mechanisms will tell the SF how to extract the data it needs from the =
MD-1 header.
        >>    [Lucy] This puts much uncertainty for a single SF on what to =
implement, which causes people's concern. IMO, if we don't have a way to ad=
dress this challenge here (you stated in interim meeting), pushing it to an=
other place does not solve/address it. For example,  will the control mecha=
nisms tell an SF how to extract the data it needs from the MD-1 header per =
a SFP, or per a SFC, or for all SFC packets, or per payload flow, or combin=
ation of them? This will significantly impact SF implementation. The reason=
 having MD type 1 is that is hardware friendly. Leaving these uncertainty o=
pen, not sure if the reason still makes a sense.
        >>
        >>    Lucy
        >>    I believe there is already text in the control plane requirem=
ents document that describes the need for this control functionality.
        >>
        >>
        >>
        >>    Yours,
        >>    Joel
        >>
        >>    On 10/17/16 11:07 AM, Lucy yong wrote:
        >>    > Suggestions:
        >>    >
        >>    > Section 3.4 should mention that this section only defines M=
D type 1
        >>    > format. The semantics of MD Type 1 is outside the scope of =
this
        >>    > document. Thus, the use of MD type 1 is outside the scope o=
f this
        >>    > document.
        >>    >
        >>    > Section 3.5 should mention that this section only defines M=
EF type 2
        >>    > format. The semantics of MD type 2 is outside the scope of =
this
        >>    > document. Thus, the use of MD type 2 is outside the scope o=
f this
        >>    > documents.
        >>    >
        >>    > IMO: these statements are important for the sections.
        >>    >
        >>    > Joel, MD semantics is critical for SFs. More than one seman=
tics of MD
        >>    > type 1 MUST NOT be specified for a SF. This should be a req=
uirement in
        >>    > the SFC arch. as a result of NSH design's, but the architec=
ture is
        >>    > already published. Maybe control plane requirement is the p=
lace to
        >>    > state this out as the result of SFC arch and NSH design.
        >>    >
        >>    > Thanks, Lucy
        >>    >
        >>    > -----Original Message----- From: sfc [mailto:sfc-bounces@ie=
tf.org] On
        >>    > Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:=
39 PM To:
        >>    > Lucy yong; sfc@ietf.org<mailto:sfc@ietf.org> Subject: Re: [=
sfc] metadata type 1 constraint
        >>    >
        >>    > A) I woud not want to state any such constraint in the NSH =
document,
        >>    > because B) In fact, the SFP ID is in every NSH header.  So =
yes, there
        >>    > is context if it is needed
        >>    >
        >>    > It is true that MD-2 is more flexible than MD-1.  I don't t=
hink anyone
        >>    > disagrees with that.
        >>    >
        >>    > Yours, Joel
        >>    >
        >>    > On 10/16/16 3:25 PM, Lucy yong wrote:
        >>    >> RFC7665 (SFC architecture) states  "This architecture allo=
ws an SF to
        >>    >> be part of multiple SFPs and SFCs."
        >>    >>
        >>    >>
        >>    >>
        >>    >> NSH just specifies MD type1 with a 16 bytes field, and  NS=
H doc.
        >>    >> states
        >>    >>
        >>    >> 3.  NSH provides a mechanism to carry shared metadata betw=
een
        >>    >>
        >>    >> participating entities and service functions.  The semanti=
cs of
        >>    >>
        >>    >> the shared metadata is communicated via a control plane, w=
hich is
        >>    >>
        >>    >> outside the scope of this document, to participating nodes=
.
        >>    >>
        >>    >>
        >>    >>
        >>    >> Comments: this mean: when an SF that is part of multiple S=
FCs and MD
        >>    >> type 1 is used in some of SFCs, these SFCs MUST have the s=
ame
        >>    >> metadata semantics.  This is because that NSH does not con=
vey SFC
        >>    >> identifier. For MD type 2, different SFCs may insert diffe=
rent list
        >>    >> of TLVs and each TLV has a type and specified semantics al=
ong (the
        >>    >> TLVs will be specified in different doc.).
        >>    >>
        >>    >>
        >>    >>
        >>    >> Should we state out this constraint in NSH doc.
        >>    >>
        >>    >>
        >>    >>
        >>    >> Lucy
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >> _______________________________________________ sfc mailin=
g list
        >>    >> sfc@ietf.org<mailto:sfc@ietf.org> https://www.ietf.org/mai=
lman/listinfo/sfc
        >>    >>
        >>    >
        >>    > _______________________________________________ sfc mailing=
 list
        >>    > sfc@ietf.org<mailto:sfc@ietf.org> https://www.ietf.org/mail=
man/listinfo/sfc
        >>    >
        >>
        >>    _______________________________________________
        >>    sfc mailing list
        >>    sfc@ietf.org<mailto:sfc@ietf.org>
        >>    https://www.ietf.org/mailman/listinfo/sfc
        >>
        >>    _______________________________________________
        >>    sfc mailing list
        >>    sfc@ietf.org<mailto:sfc@ietf.org>
        >>    https://www.ietf.org/mailman/listinfo/sfc
        >>
        >>
        >
        > _______________________________________________
        > sfc mailing list
        > sfc@ietf.org<mailto:sfc@ietf.org>
        > https://www.ietf.org/mailman/listinfo/sfc

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


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<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">If we intend to standa=
rdize metadata structure per an SFC application, I wonder why NSH needs MD#=
1? MD#2 can support all SFC needs. MD#2 even support expert
 review metadata class, experimental metadata class as well. Should conside=
r removing MD#1?<o:p></o:p></span></i></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></i></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Lucy<o:p></o:p></span>=
</i></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></i></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>Vigoureux, Martin (Nokia - FR)<br>
<b>Sent:</b> Friday, October 21, 2016 7:56 AM<br>
<b>To:</b> Van De Velde, Gunter (Nokia - BE); Paul Quinn (paulq); Joel M. H=
alpern<br>
<b>Cc:</b> sfc@ietf.org<br>
<b>Subject:</b> Re: [sfc] metadata type 1 constraint<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal">From the latest discussion I wonder if the allocatio=
n drafts shouldn't in fact define their own MD type (3, 4, ...).<br>
<br>
If there is a need/use for that, a TLV for framing these MDs in MD2 could b=
e defined, as sfc-nsh-tlv now does.<br>
<br>
I'd in any case prefer to avoid duplicating specifications across documents=
, and as such sfc-nsh-tlv should only reference the encodings, not replicat=
e them.<br>
<br>
-m<o:p></o:p></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><br>
<br>
-------- Message d'origine --------<br>
De : &quot;Van De Velde, Gunter (Nokia - BE)&quot; &lt;<a href=3D"mailto:gu=
nter.van_de_velde@nokia.com">gunter.van_de_velde@nokia.com</a>&gt;
<br>
Date :21/10/2016 14:36 (GMT&#43;01:00) <br>
=C0 : &quot;Paul Quinn (paulq)&quot; &lt;<a href=3D"mailto:paulq@cisco.com"=
>paulq@cisco.com</a>&gt;, &quot;Joel M. Halpern&quot; &lt;<a href=3D"mailto=
:jmh@joelhalpern.com">jmh@joelhalpern.com</a>&gt;
<br>
Cc : <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a> <br>
Objet : Re: [sfc] metadata type 1 constraint <o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt">The good news is th=
at draft draft-quinn-sfc-nsh-tlv-02.txt now has a fix suggesting context al=
location scheme encoding:<br>
<br>
<a href=3D"https://tools.ietf.org/rfcdiff?">https://tools.ietf.org/rfcdiff?=
</a><br>
&nbsp; url1=3Dhttps://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-01.txt<br>
&nbsp; &amp;url2=3Dhttps://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-02.txt=
<br>
<br>
However, if the intent is that MD#1 is Opaque, then why even try to suggest=
 encodings for it? Opaque info is opaque info&#8230; either you define it, =
or you do not define it&#8230; anything else is confusing and contradicting=
 from operational and implementation perspective.<br>
<br>
I would prefer to see that both &#8220;Data Center Allocation&#8221; and &#=
8220;Mobility/Broadband Allocation&#8221; drafts are written with intended =
main usage in a MD#2, instead of MD#1 as then it is a complete and interope=
rable allocation scheme usage with significantly reduced
 operational overhead and restrictions. Assuming the length of these alloca=
tion blobs fixed at 16 octets for potentially stuffing them in a MD#1 sound=
s fine.
<br>
<br>
G/<br>
<br>
<br>
<br>
On 19/10/2016, 17:22, &quot;sfc on behalf of Van De Velde, Gunter (Nokia - =
BE)&quot; &lt;<a href=3D"mailto:sfc-bounces@ietf.org%20on%20behalf%20of%20g=
unter.van_de_velde@nokia.com">sfc-bounces@ietf.org on behalf of gunter.van_=
de_velde@nokia.com</a>&gt; wrote:<br>
<br>
&nbsp;&nbsp;&nbsp; It is sad that we significantly increase the operational=
 burden for allocation scheme signalling for MD#1. I am dazzled the WG beli=
eves stateful signalling is easier for deployment compared with a stateless=
 solution for MD#1. The imposed operational complexity
 is significant with current proposal.<br>
&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; G/<br>
&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; On 19/10/2016, 15:33, &quot;sfc on behalf of Paul Quinn =
(paulq)&quot; &lt;<a href=3D"mailto:sfc-bounces@ietf.org%20on%20behalf%20of=
%20paulq@cisco.com">sfc-bounces@ietf.org on behalf of paulq@cisco.com</a>&g=
t; wrote:<br>
&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Joel,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I agree with you: the current ap=
proach is simple and workable.&nbsp; The allocation scheme are simply infor=
mation examples.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Paul<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; On Oct 18, 2016, at 8:14 PM=
, Joel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.com">jmh@joelhalper=
n.com</a>&gt; wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Our current approach is to =
allow definition of allocation schemes, but not to mandate any specific all=
ocation scheme for MD-1.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; That seems to me to be a go=
od approach, workable, and what we have agreed and documented.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Yours,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Joel<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; On 10/18/16 12:09 PM, Van D=
e Velde, Gunter (Nokia - BE) wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; If NSH MD Type-1 define=
s for the metadata to be Opaque, then we should not make an effort to defin=
e it, and just tread it as Opaque content imo and live with the consequence=
s&#8230;and in that case use MD Type-2 for these types of well known metada=
ta transport
 mechanisms.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; If however, we decide t=
o define the allocation schemes, then we should also architect an indicator=
 for the used allocation scheme.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; At this point in time, =
there models were suggested (overload Length, overload MD type, use few bit=
s of MD context data).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; I strongly believe ther=
e is value in having the metadata allocation structure signalled within the=
 NSH itself, even for MD Type-1.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; (It avoids control plan=
e signalling and creates state which needs to be maintained, and that sound=
s as a very expensive operation).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; Alternate is to just sa=
y as Lucy suggests, and restrict MD Type-1 Service Chain SF&#8217;s per all=
ocation scheme. This is a solution that works, albeit it is a very impactin=
g restriction for flexibility and resource sharing).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; G/<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; On 18/10/2016, 16:49, &=
quot;sfc on behalf of Lucy yong&quot; &lt;<a href=3D"mailto:sfc-bounces@iet=
f.org%20on%20behalf%20of%20lucy.yong@huawei.com">sfc-bounces@ietf.org on be=
half of lucy.yong@huawei.com</a>&gt; wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Comme=
nt on &quot;Allocating a nibble or byte within the 32 bytes (probably the f=
irst nibble or byte) is yet another.&quot;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy:=
 Technically We can do this on MD#1, but NSH already defines MD#2. Is the v=
ariable length the only feature that hardware can't deal with?<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; -----=
Original Message-----<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; From:=
 Ron Parker [<a href=3D"mailto:Ron_Parker@affirmednetworks.com">mailto:Ron_=
Parker@affirmednetworks.com</a>]<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Sent:=
 Tuesday, October 18, 2016 10:05 AM<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; To: L=
ucy yong; Joel M. Halpern; <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a>=
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Subje=
ct: RE: [sfc] metadata type 1 constraint<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Even =
though the interpretation of metadata is dependent on control plane interac=
tion, where I think the original proposal has value is that there might be =
multiple separate interpretations simultaneously within the same administra=
tive domain.&nbsp;&nbsp;
 A way to describe, on the wire, which of those interpretations is in force=
 for that particular SFP seems valuable to me.&nbsp;&nbsp; You could defini=
tely argue that the control plane could install the interpretation locally =
on a per SFP basis;&nbsp; also being explicit on
 the wire will likely enhance interoperability and debuggability.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; The v=
alue would be locally significant within the administrative domain (i.e., m=
etadata schema 1, metatadata schema 2, etc.).&nbsp;&nbsp; Overloading lengt=
h is one way.&nbsp;&nbsp; Overloading MD-type is another.&nbsp;&nbsp; Alloc=
ating a nibble or byte within the 32 bytes
 (probably the first nibble or byte) is yet another.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; Ron<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; -----=
Original Message-----<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; From:=
 sfc [<a href=3D"mailto:sfc-bounces@ietf.org">mailto:sfc-bounces@ietf.org</=
a>] On Behalf Of Lucy yong<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Sent:=
 Tuesday, October 18, 2016 10:27 AM<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; To: J=
oel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.com">jmh@joelhalpern.c=
om</a>&gt;;
<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Subje=
ct: Re: [sfc] metadata type 1 constraint<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Joel,=
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy,=
 while your two text proposals are not wrong, I do not see them as adding a=
ny clarity to the document.&nbsp; The sections are very short and clearly d=
efine only the syntax.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; [Lucy=
] True. However, for this document, readers expect Section 3 to describe NS=
H syntax and semantics. Section 3.1-3.3 do both. If section 3.4 and 3.5 jus=
t specify the syntax, from documenting perspective, it is important to expl=
icitly state
 the two text out.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; With =
regard to SF and MD-1 support, there is absolutely nothing that requires an=
 SF to support only one MD-1 structure.&nbsp; Rather, the control mechanism=
s will tell the SF how to extract the data it needs from the MD-1 header.<b=
r>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; [Lucy=
] This puts much uncertainty for a single SF on what to implement, which ca=
uses people's concern. IMO, if we don't have a way to address this challeng=
e here (you stated in interim meeting), pushing it to another place does no=
t solve/address
 it. For example,&nbsp; will the control mechanisms tell an SF how to extra=
ct the data it needs from the MD-1 header per a SFP, or per a SFC, or for a=
ll SFC packets, or per payload flow, or combination of them? This will sign=
ificantly impact SF implementation. The
 reason having MD type 1 is that is hardware friendly. Leaving these uncert=
ainty open, not sure if the reason still makes a sense.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; I bel=
ieve there is already text in the control plane requirements document that =
describes the need for this control functionality.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Yours=
,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Joel<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; On 10=
/17/16 11:07 AM, Lucy yong wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Suggestions:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Section 3.4 should mention that this section only defines MD type 1<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
format. The semantics of MD Type 1 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
document. Thus, the use of MD type 1 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
document.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Section 3.5 should mention that this section only defines MEF type 2<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
format. The semantics of MD type 2 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
document. Thus, the use of MD type 2 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
documents.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
IMO: these statements are important for the sections.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Joel, MD semantics is critical for SFs. More than one semantics of MD<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
type 1 MUST NOT be specified for a SF. This should be a requirement in<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
the SFC arch. as a result of NSH design's, but the architecture is<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
already published. Maybe control plane requirement is the place to<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
state this out as the result of SFC arch and NSH design.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Thanks, Lucy<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
-----Original Message----- From: sfc [<a href=3D"mailto:sfc-bounces@ietf.or=
g">mailto:sfc-bounces@ietf.org</a>] On<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:39 PM To:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Lucy yong; <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a> Subject: Re: [s=
fc] metadata type 1 constraint<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
A) I woud not want to state any such constraint in the NSH document,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
because B) In fact, the SFP ID is in every NSH header.&nbsp; So yes, there<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
is context if it is needed<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
It is true that MD-2 is more flexible than MD-1.&nbsp; I don't think anyone=
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
disagrees with that.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Yours, Joel<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
On 10/16/16 3:25 PM, Lucy yong wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; RFC7665 (SFC architecture) states&nbsp; &quot;This architecture allows =
an SF to<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; be part of multiple SFPs and SFCs.&quot;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; NSH just specifies MD type1 with a 16 bytes field, and&nbsp; NSH doc.<b=
r>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; states<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; 3.&nbsp; NSH provides a mechanism to carry shared metadata between<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; participating entities and service functions.&nbsp; The semantics of<br=
>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; the shared metadata is communicated via a control plane, which is<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; outside the scope of this document, to participating nodes.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; Comments: this mean: when an SF that is part of multiple SFCs and MD<br=
>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; type 1 is used in some of SFCs, these SFCs MUST have the same<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; metadata semantics.&nbsp; This is because that NSH does not convey SFC<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; identifier. For MD type 2, different SFCs may insert different list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; of TLVs and each TLV has a type and specified semantics along (the<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; TLVs will be specified in different doc.).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; Should we state out this constraint in NSH doc.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; Lucy<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; _______________________________________________ sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a> <a href=3D"https://www=
.ietf.org/mailman/listinfo/sfc">
https://www.ietf.org/mailman/listinfo/sfc</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
_______________________________________________ sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a> <a href=3D"https://www.iet=
f.org/mailman/listinfo/sfc">
https://www.ietf.org/mailman/listinfo/sfc</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; _____=
__________________________________________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; sfc m=
ailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; <a hr=
ef=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; <a hr=
ef=3D"https://www.ietf.org/mailman/listinfo/sfc">https://www.ietf.org/mailm=
an/listinfo/sfc</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; _____=
__________________________________________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; sfc m=
ailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; <a hr=
ef=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; <a hr=
ef=3D"https://www.ietf.org/mailman/listinfo/sfc">https://www.ietf.org/mailm=
an/listinfo/sfc</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; ___________________________=
____________________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; <a href=3D"mailto:sfc@ietf.=
org">sfc@ietf.org</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; <a href=3D"https://www.ietf=
.org/mailman/listinfo/sfc">https://www.ietf.org/mailman/listinfo/sfc</a><br=
>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ________________________________=
_______________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"mailto:sfc@ietf.org">=
sfc@ietf.org</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href=3D"https://www.ietf.org/=
mailman/listinfo/sfc">https://www.ietf.org/mailman/listinfo/sfc</a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; <br>
&nbsp;&nbsp;&nbsp; _______________________________________________<br>
&nbsp;&nbsp;&nbsp; sfc mailing list<br>
&nbsp;&nbsp;&nbsp; <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
&nbsp;&nbsp;&nbsp; <a href=3D"https://www.ietf.org/mailman/listinfo/sfc">ht=
tps://www.ietf.org/mailman/listinfo/sfc</a><br>
&nbsp;&nbsp;&nbsp; <br>
<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">https://www.ietf.org/=
mailman/listinfo/sfc</a><o:p></o:p></span></p>
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From nobody Fri Oct 21 16:28:07 2016
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Subject: [sfc] sfc - Requested session has been scheduled for IETF 97
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Dear Martin Stiemerling,

The session(s) that you have requested have been scheduled.
Below is the scheduled session information followed by
the original request. 

sfc Session 1 (2:00:00)
    Monday, Morning Session I 0930-1200
    Room Name: Grand Ballroom 1 size: 300
    ---------------------------------------------
    


Request Information:


---------------------------------------------------------
Working Group Name: Service Function Chaining
Area Name: Routing Area
Session Requester: Martin Stiemerling

Number of Sessions: 1
Length of Session(s):  2 Hours
Number of Attendees: 200
Conflicts to Avoid: 
 First Priority: spring sdnrg rtgwg nvo3 mpls lisp idr i2rs bess




Special Requests:
  Please add the quic bof (if approved to the 1st priority conflict list)
---------------------------------------------------------


From nobody Sat Oct 22 02:52:26 2016
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From: <mohamed.boucadair@orange.com>
To: Lucy yong <lucy.yong@huawei.com>, "Joel M. Halpern" <jmh@joelhalpern.com>,  "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, "Ron Parker" <Ron_Parker@affirmednetworks.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] metadata type 1 constraint
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Subject: Re: [sfc] metadata type 1 constraint
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From nobody Sun Oct 23 23:39:10 2016
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Service Function Chaining of the IETF.

        Title           : Service Function Chaining (SFC) Control Plane Components & Requirements
        Author          : Mohamed Boucadair
	Filename        : draft-ietf-sfc-control-plane-08.txt
	Pages           : 29
	Date            : 2016-10-23

Abstract:
   This document describes requirements for conveying information
   between Service Function Chaining (SFC) control elements and SFC data
   plane functional elements.  Also, this document identifies a set of
   control interfaces to interact with SFC-aware elements to establish,
   maintain or recover service function chains.  This document does not
   specify protocols nor extensions to existing protocols.

   This document exclusively focuses on SFC deployments that are under
   the responsibility of a single administrative entity.  Inter-domain
   considerations are out of scope.


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

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-sfc-control-plane-08

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-control-plane-08


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

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


From nobody Mon Oct 24 00:38:22 2016
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From: <mohamed.boucadair@orange.com>
To: "Roberta Maglione (robmgl)" <robmgl@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] FW: New Version Notification for draft-maglione-sfc-nsh-radius-00.txt
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Date: Mon, 24 Oct 2016 07:38:17 +0000
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Subject: Re: [sfc] FW: New Version Notification for draft-maglione-sfc-nsh-radius-00.txt
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Hi Roberta,=20

Thank you for sharing this draft. Some comments below:

* You may consider the template in https://tools.ietf.org/html/draft-ietf-r=
adext-datatypes-08#section-2.1.3 for defining the RADIUS attributes.=20

* This draft is an implementation of the "C1: Interface between SFC Control=
 Plane & SFC Classifier" interface: https://tools.ietf.org/html/draft-ietf-=
sfc-control-plane-08#section-3.3.1. Having a reference to the CP architectu=
re would be helpful. If you can indicate which requirements from the CP doc=
ument you are targeting, this would be even appreciated.=20

* The draft focuses on two pieces of information that can be instructed via=
 the CP. I do agree those two are important ones, but I wonder whether thos=
e are sufficient to cover SFC needs in the broadband case. For example, how=
 to demux among multiple services to be delivered to the same subscriber? D=
o you assume that other control protocols are used to instruct the classifi=
cation rules or this is done by RADIUS?

* Because NSH-SI may be bound to a given path, the presence of NSH-SPI attr=
ibute may be required. BTW, I wonder whether you can define a "SFC Rule" RA=
DIUS attribute that can convey one or many SFC-related TLVs (e.g., NSH-SPI,=
 NSH-SI, etc.).

Thank you.

Cheers,
Med=20

> -----Message d'origine-----
> De=A0: sfc [mailto:sfc-bounces@ietf.org] De la part de Roberta Maglione
> (robmgl)
> Envoy=E9=A0: samedi 22 octobre 2016 11:52
> =C0=A0: sfc@ietf.org
> Objet=A0: [sfc] FW: New Version Notification for draft-maglione-sfc-nsh-
> radius-00.txt
>=20
> Hello,
> We submitted this document about Radius attributes for NSH.
> The draft is targeted at addressing Broadband access use cases.
> Your comments are welcome.
> Best Regards
> Roberta
>=20
> -----Original Message-----
> From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> Sent: Saturday, October 15, 2016 9:08 AM
> To: Guillermo Trueba (gtrueba) <gtrueba@cisco.com>; Roberta Maglione
> (robmgl) <robmgl@cisco.com>; Carlos Pignataro (cpignata)
> <cpignata@cisco.com>
> Subject: New Version Notification for draft-maglione-sfc-nsh-radius-00.tx=
t
>=20
>=20
> A new version of I-D, draft-maglione-sfc-nsh-radius-00.txt
> has been successfully submitted by Roberta Maglione and posted to the IET=
F
> repository.
>=20
> Name:		draft-maglione-sfc-nsh-radius
> Revision:	00
> Title:		RADIUS Attributes for NSH
> Document date:	2016-10-14
> Group:		Individual Submission
> Pages:		10
> URL:            https://www.ietf.org/internet-drafts/draft-maglione-sfc-
> nsh-radius-00.txt
> Status:         https://datatracker.ietf.org/doc/draft-maglione-sfc-nsh-
> radius/
> Htmlized:       https://tools.ietf.org/html/draft-maglione-sfc-nsh-radius=
-
> 00
>=20
>=20
> Abstract:
>    Network Service Header (NSH) protocol defines the Service Function
>    Chaining (SFC) encapsulation required to support the Service Function
>    Chaining (SFC) Architecture.  One of the components of the Network
>    Service Header (NSH) protocol is the Service Path Identifier (SPI),
>    which identifies a service path, another important element of the NSH
>    protocol is the Service Index (SI), which provides location within
>    the Service Path.
>=20
>    When Service Providers would like to deliver customized services
>    offers requiring Service Functions Chains, a different service chain
>    may be required for each subscriber or group of subscribers.  In
>    order to simplify the service provisioning in this scenario, it would
>    be useful to be able to associate the Service Path Identifier (SPI),
>    identifying the service chain, and the appropriate Service Index
>    (SI), identifying the location in the service path, with the customer
>    profile.
>=20
>    In some Broadband networks, the customer profile information may be
>    stored in Authentication, Authorization, and Accounting (AAA)
>    servers.  This document specifies two new Remote Authentication Dial-
>    In User Service (RADIUS) attributes to carry the Service Path
>    Identifier (SPI) and the Service Index (SI).
>=20
>=20
>=20
>=20
> Please note that it may take a couple of minutes from the time of
> submission until the htmlized version and diff are available at
> tools.ietf.org.
>=20
> The IETF Secretariat
>=20
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc


From nobody Mon Oct 24 04:12:56 2016
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From: "Roberta Maglione (robmgl)" <robmgl@cisco.com>
To: "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] FW: New Version Notification for draft-maglione-sfc-nsh-radius-00.txt
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Subject: Re: [sfc] FW: New Version Notification for draft-maglione-sfc-nsh-radius-00.txt
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Hello Med,
Thanks for your comments.
Please see answers inline [RM]
Regards
Roberta


-----Original Message-----
From: mohamed.boucadair@orange.com [mailto:mohamed.boucadair@orange.com]=20
Sent: Monday, October 24, 2016 9:38 AM
To: Roberta Maglione (robmgl) <robmgl@cisco.com>; sfc@ietf.org
Subject: RE: [sfc] FW: New Version Notification for draft-maglione-sfc-nsh-=
radius-00.txt

Hi Roberta,=20

Thank you for sharing this draft. Some comments below:

* You may consider the template in https://tools.ietf.org/html/draft-ietf-r=
adext-datatypes-08#section-2.1.3 for defining the RADIUS attributes.=20

[RM] Thanks for the pointer, I can modify the format of the attributes addi=
ng "description" and "Type" fields in order to follow the guidelines define=
d there.=20

* This draft is an implementation of the "C1: Interface between SFC Control=
 Plane & SFC Classifier" interface: https://tools.ietf.org/html/draft-ietf-=
sfc-control-plane-08#section-3.3.1. Having a reference to the CP architectu=
re would be helpful. If you can indicate which requirements from the CP doc=
ument you are targeting, this would be even appreciated.=20

[RM] let me take another  closer look at the control plane draft and I come=
 back to you on this point.

* The draft focuses on two pieces of information that can be instructed via=
 the CP. I do agree those two are important ones, but I wonder whether thos=
e are sufficient to cover SFC needs in the broadband case. For example, how=
 to demux among multiple services to be delivered to the same subscriber? D=
o you assume that other control protocols are used to instruct the classifi=
cation rules or this is done by RADIUS?

[RM] SPI and SI are the minimal set of parameters required to identify a se=
rvice chain. Regarding your question about demuxing multiple services, the =
idea here is that each subscriber will subscribe/pay for a different offer/=
service. A service may require to go across different SF's thus a service c=
hain is required. A classification rule can be used to specific which type =
of traffic should go through the service chain
The classification rule can be sent by RADIUS, as written at the end of=20
Section 3, " A classification rule, to be associated with the SPI, can also=
 be sent by the AAA Server as part of the list of attribute-value pairs."
Or it can be specified by other means, for example pre-configured on the NA=
S. In most of the case that could be all the traffic coming from that subsc=
riber line.

* Because NSH-SI may be bound to a given path, the presence of NSH-SPI attr=
ibute may be required.
[RM] You are correct and this is taken in care by the text in section 4.1

"  If the NAS does not receive the NSH-SPI attribute in the Access-
   Accept message, it MAY fall back to a pre-configured default NSH SPI,
   if any.  If the NAS does not have any pre-configured NSH SPI, the
   traffic generated by that specific subscriber does not have to be
   sent across any service chain."

 BTW, I wonder whether you can define a "SFC Rule" RADIUS attribute that ca=
n convey one or many SFC-related TLVs (e.g., NSH-SPI, NSH-SI, etc.).

[RM] I don't think such complexity would be required to address most of the=
 common broadband use cases.



Thank you.

Cheers,
Med=20

> -----Message d'origine-----
> De=A0: sfc [mailto:sfc-bounces@ietf.org] De la part de Roberta Maglione
> (robmgl)
> Envoy=E9=A0: samedi 22 octobre 2016 11:52
> =C0=A0: sfc@ietf.org
> Objet=A0: [sfc] FW: New Version Notification for draft-maglione-sfc-nsh-=
=20
> radius-00.txt
>=20
> Hello,
> We submitted this document about Radius attributes for NSH.
> The draft is targeted at addressing Broadband access use cases.
> Your comments are welcome.
> Best Regards
> Roberta
>=20
> -----Original Message-----
> From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> Sent: Saturday, October 15, 2016 9:08 AM
> To: Guillermo Trueba (gtrueba) <gtrueba@cisco.com>; Roberta Maglione
> (robmgl) <robmgl@cisco.com>; Carlos Pignataro (cpignata)=20
> <cpignata@cisco.com>
> Subject: New Version Notification for=20
> draft-maglione-sfc-nsh-radius-00.txt
>=20
>=20
> A new version of I-D, draft-maglione-sfc-nsh-radius-00.txt
> has been successfully submitted by Roberta Maglione and posted to the=20
> IETF repository.
>=20
> Name:		draft-maglione-sfc-nsh-radius
> Revision:	00
> Title:		RADIUS Attributes for NSH
> Document date:	2016-10-14
> Group:		Individual Submission
> Pages:		10
> URL:            https://www.ietf.org/internet-drafts/draft-maglione-sfc-
> nsh-radius-00.txt
> Status:         https://datatracker.ietf.org/doc/draft-maglione-sfc-nsh-
> radius/
> Htmlized:       https://tools.ietf.org/html/draft-maglione-sfc-nsh-radius=
-
> 00
>=20
>=20
> Abstract:
>    Network Service Header (NSH) protocol defines the Service Function
>    Chaining (SFC) encapsulation required to support the Service Function
>    Chaining (SFC) Architecture.  One of the components of the Network
>    Service Header (NSH) protocol is the Service Path Identifier (SPI),
>    which identifies a service path, another important element of the NSH
>    protocol is the Service Index (SI), which provides location within
>    the Service Path.
>=20
>    When Service Providers would like to deliver customized services
>    offers requiring Service Functions Chains, a different service chain
>    may be required for each subscriber or group of subscribers.  In
>    order to simplify the service provisioning in this scenario, it would
>    be useful to be able to associate the Service Path Identifier (SPI),
>    identifying the service chain, and the appropriate Service Index
>    (SI), identifying the location in the service path, with the customer
>    profile.
>=20
>    In some Broadband networks, the customer profile information may be
>    stored in Authentication, Authorization, and Accounting (AAA)
>    servers.  This document specifies two new Remote Authentication Dial-
>    In User Service (RADIUS) attributes to carry the Service Path
>    Identifier (SPI) and the Service Index (SI).
>=20
>=20
>=20
>=20
> Please note that it may take a couple of minutes from the time of=20
> submission until the htmlized version and diff are available at=20
> tools.ietf.org.
>=20
> The IETF Secretariat
>=20
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc


From nobody Mon Oct 24 10:29:23 2016
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From: Alia Atlas <akatlas@gmail.com>
Date: Mon, 24 Oct 2016 13:29:19 -0400
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Subject: [sfc] SFC Chair changes & request for private suggestions on replacement
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Thomas & Martin will be stepping down as SFC WG Chairs once I have
appointed a replacement.  I would like to thank Thomas for his efforts
since SFC was chartered in helping SFC progress.  I would also like to
thank Martin for his work over this past year.

Usually, when it is time to appoint a new WG chair, I consult privately
with the current WG Chairs, my co-ADs, and people active in the WG to
brainstorm about whom would be good candidates.  This time, in addition, to
broaden the pool of those considered, I would like to ask those active in
the WG for private suggestions on whom might be a good SFC working group
chair to replace Martin and Thomas.  Please send me such suggestions by no
later than Oct 31.

I expect to have a new SFC Chair selected to work with Jim before IETF 97.

Regards,
Alia

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<div dir=3D"ltr"><div>Thomas &amp; Martin will be stepping down as SFC WG C=
hairs once I have appointed a replacement.=C2=A0 I would like to thank Thom=
as for his efforts since SFC was chartered in helping SFC progress.=C2=A0 I=
 would also like to thank Martin for his work over this past year.</div><sp=
an style=3D"font-size:12.8px"><div><span style=3D"font-size:12.8px"><br></s=
pan></div>Usually, when it is time to appoint a new WG chair, I consult pri=
vately with the current WG Chairs, my co-ADs, and people active in the WG t=
o brainstorm about whom would be good candidates.=C2=A0 This time, in addit=
ion, to broaden the pool of those considered, I would like to ask those act=
ive in the WG for private suggestions on whom might be a good SFC working g=
roup chair to replace Martin and Thomas.=C2=A0 Please send me such suggesti=
ons by no later than Oct 31.</span><div><span style=3D"font-size:12.8px"><b=
r></span></div><div><span style=3D"font-size:12.8px">I expect to have a new=
 SFC Chair selected to work with Jim before IETF 97.</span></div><div><span=
 style=3D"font-size:12.8px"><br></span></div><div><span style=3D"font-size:=
12.8px">Regards,</span></div><div><span style=3D"font-size:12.8px">Alia</sp=
an></div></div>

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From: "Paul Quinn (paulq)" <paulq@cisco.com>
To: Lucy yong <lucy.yong@huawei.com>
Thread-Topic: [sfc] metadata type 1 constraint
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Date: Mon, 24 Oct 2016 21:22:39 +0000
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From: Dave Dolson <ddolson@sandvine.com>
To: "Paul Quinn (paulq)" <paulq@cisco.com>, Lucy yong <lucy.yong@huawei.com>
Thread-Topic: [sfc] metadata type 1 constraint
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Subject: Re: [sfc] metadata type 1 constraint
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From: "Paul Quinn (paulq)" <paulq@cisco.com>
To: Dave Dolson <ddolson@sandvine.com>
Thread-Topic: [sfc] metadata type 1 constraint
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Date: Mon, 24 Oct 2016 22:41:37 +0000
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Subject: Re: [sfc] metadata type 1 constraint
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On Oct 24, 2016, at 3:20 PM, Dave Dolson <ddolson@sandvine.com<mailto:ddols=
on@sandvine.com>> wrote:

Paul,
IPv4 has a variable-length header, and I would call it widely deployed.

Dave, on the contrary, IPv4 options -- i.e. the variable portion of IPv4 --=
 are almost never used due to the the cost of this support.

Further, simply saying: "support TLV" obscures what support means: how many=
, what orders, etc.  All this ambiguity, or if you prefer, flexibility, fur=
thers the cost of TLV data plane deployments.

--_000_25212260ABE049EB9916419A2186B3C7ciscocom_
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<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;" class=3D"">
<br class=3D"">
<div>
<blockquote type=3D"cite" class=3D"">
<div class=3D"">On Oct 24, 2016, at 3:20 PM, Dave Dolson &lt;<a href=3D"mai=
lto:ddolson@sandvine.com" class=3D"">ddolson@sandvine.com</a>&gt; wrote:</d=
iv>
<br class=3D"Apple-interchange-newline">
<div class=3D"">
<div class=3D"" style=3D"word-wrap:break-word">
<div style=3D"width:100%; font-size:initial; font-family:Calibri,'Slate Pro=
',sans-serif,sans-serif; color:rgb(31,73,125); text-align:initial; backgrou=
nd-color:rgb(255,255,255)" class=3D"">
Paul,</div>
<div style=3D"width:100%; font-size:initial; font-family:Calibri,'Slate Pro=
',sans-serif,sans-serif; color:rgb(31,73,125); text-align:initial; backgrou=
nd-color:rgb(255,255,255)" class=3D"">
IPv4 has a variable-length header, and I would call it widely deployed.</di=
v>
</div>
</div>
</blockquote>
<div><br class=3D"">
</div>
<div>Dave, on the contrary, IPv4 options -- i.e. the variable portion of IP=
v4 -- are almost never used due to the the cost of this support. &nbsp;</di=
v>
<div><br class=3D"">
</div>
<div>Further, simply saying: &quot;support TLV&quot; obscures what support =
means: how many, what orders, etc. &nbsp;All this ambiguity, or if you pref=
er, flexibility, furthers the cost of TLV data plane deployments.</div>
</div>
</body>
</html>

--_000_25212260ABE049EB9916419A2186B3C7ciscocom_--


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From: Lucy yong <lucy.yong@huawei.com>
To: "Paul Quinn (paulq)" <paulq@cisco.com>
Thread-Topic: [sfc] metadata type 1 constraint
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From: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
To: Lucy yong <lucy.yong@huawei.com>, "Paul Quinn (paulq)" <paulq@cisco.com>
Thread-Topic: [sfc] metadata type 1 constraint
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Subject: [sfc]  #21 (nsh): MD#1 Interoperability text (Proposed by Lucy)
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#21: MD#1 Interoperability text (Proposed by Lucy)

 Add ths NEW text (https://www.ietf.org/mail-
 archive/web/sfc/current/msg05110.html):

 ==
 This specification allows defining different semantics of metadata type 1
 related mandatory context header, but the NSH header does not convey that
 semantic in the context headers. An SFC-aware SF MUST receive the data
 extraction schema first in order to get the data placed in the mandatory
 context header. How an SFC-aware SF gets the data extraction schema for
 the mandatory context header is outside the scope of this specification.
 This specification does not make any assumption about the content placed
 in the mandatory context header. Upon receiving an SFC packet with
 metadata type 1 present, if an SFC-aware SF is configured to use metadata
 but does not yet receive the data extraction schema for the mandatory
 context header, it MUST NOT process the packet and MUST log this error.
 ==

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |      Owner:  draft-ietf-sfc-
  mohamed.boucadair@orange.com       |  nsh@tools.ietf.org
     Type:  defect                   |     Status:  new
 Priority:  major                    |  Milestone:
Component:  nsh                      |    Version:
 Severity:  Active WG Document       |   Keywords:
-------------------------------------+-------------------------------------

Ticket URL: <https://trac.tools.ietf.org/wg/sfc/trac/ticket/21>
sfc <https://tools.ietf.org/sfc/>


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#22: MD-1 with 16-bytes datablock

 Make the following change which an outcome of the discussion:
 https://www.ietf.org/mail-archive/web/sfc/current/msg05110.html

 ==
 OLD:

      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Ver|O|C|R|R|R|R|R|R|   Length  |  MD type=0x1  | Next Protocol |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Service Path Identifer               | Service Index |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                Mandatory Context Header                       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                Mandatory Context Header                       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                Mandatory Context Header                       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                Mandatory Context Header                       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 NEW:
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Ver|O|C|R|R|R|R|R|R|   Length  |  MD type=0x1  | Next Protocol |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Service Path Identifer               | Service Index |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                Mandatory Context Header                       |
     |                                                               |
     |                                                               |
     |                                                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |      Owner:  draft-ietf-sfc-
  mohamed.boucadair@orange.com       |  nsh@tools.ietf.org
     Type:  defect                   |     Status:  new
 Priority:  major                    |  Milestone:
Component:  nsh                      |    Version:
 Severity:  Active WG Document       |   Keywords:
-------------------------------------+-------------------------------------

Ticket URL: <https://trac.tools.ietf.org/wg/sfc/trac/ticket/22>
sfc <https://tools.ietf.org/sfc/>


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#23: 'C' flag

 Re-,

 Unless I'm mistaken, I didn't see any follow-up for this issue.

 Cheers,
 Med

 > -----Message d'origine-----
 > De : Dave Dolson [mailto:ddolson@sandvine.com]
 > EnvoyÃ© : mardi 6 septembre 2016 20:25
 > Ã€ : BOUCADAIR Mohamed IMT/OLN; Paul Quinn (paulq); sfc@ietf.org
 > Objet : RE: [sfc] Fwd: I-D Action: draft-ietf-sfc-nsh-06.txt
 >
 > Do the authors have a response to this question?
 > I'm also wondering about whether the 'C' flag might be for the
 > administrator vs. IANA.
 >
 >
 > -----Original Message-----
 > From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of
 > mohamed.boucadair@orange.com
 > Sent: Thursday, August 25, 2016 11:40 AM
 > To: Paul Quinn (paulq); sfc@ietf.org
 > Subject: Re: [sfc] Fwd: I-D Action: draft-ietf-sfc-nsh-06.txt
 >
 > Hi Paul,
 >
 > I have a comment about this text:
 >
 >    Type: the Type field is split into two ranges - 0 to 127 for non-
 >    critical options and 128-255 for critical options.  While the value
 >    allocation is the responsibility of the MD Class owner, critical
 >    options MUST NOT be allocated from the 0 to 127 range and non-
 >    critical options MUST NOT be allocated from the 128-255 range.
 >
 > * Do you have an example of metadata that is critical for all chains,
 all
 > deployments?
 > * Wouldn't be more appropriate to have one single registry for "type"
 with
 > C-bit be a configurable parameter to be set by the administrator of the
 > SFC-enabled domain?
 >
 > Thank you.
 >
 > Cheers,
 > Med
 >
 > > -----Message d'origine-----
 > > De : sfc [mailto:sfc-bounces@ietf.org] De la part de Paul Quinn
 (paulq)
 > > EnvoyÃ© : mardi 23 aoÃ»t 2016 16:02
 > > Ã€ : sfc@ietf.org
 > > Objet : [sfc] Fwd: I-D Action: draft-ietf-sfc-nsh-06.txt
 > >
 > > Dear WG,
 > >
 > > This version includes much of the feedback/review/comments from this
 > list.
 > >
 > >
 > >
 > > > Begin forwarded message:
 > > >
 > > > From: internet-drafts@ietf.org
 > > > Subject: [sfc] I-D Action: draft-ietf-sfc-nsh-06.txt
 > > > Date: August 23, 2016 at 9:54:21 AM EDT
 > > > To: <i-d-announce@ietf.org>
 > > > Cc: sfc@ietf.org
 > > >
 > > >
 > > > A New Internet-Draft is available from the on-line Internet-Drafts
 > > directories.
 > > > This draft is a work item of the Service Function Chaining of the
 > IETF.
 > > >
 > > >        Title           : Network Service Header
 > > >        Authors         : Paul Quinn
 > > >                          Uri Elzur
 > > >   Filename        : draft-ietf-sfc-nsh-06.txt
 > > >   Pages           : 37
 > > >   Date            : 2016-08-23
 > > >
 > > > Abstract:
 > > >   This document describes a Network Service Header (NSH) inserted
 onto
 > > >   packets or frames to realize service function paths.  NSH also
 > > >   provides a mechanism for metadata exchange along the instantiated
 > > >   service path.  NSH is the SFC encapsulation required to support
 the
 > > >   Service Function Chaining (SFC) Architecture (defined in RFC7665).
 > > >
 > > >
 > > > The IETF datatracker status page for this draft is:
 > > > https://datatracker.ietf.org/doc/draft-ietf-sfc-nsh/
 > > >
 > > > There's also a htmlized version available at:
 > > > https://tools.ietf.org/html/draft-ietf-sfc-nsh-06
 > > >
 > > > A diff from the previous version is available at:
 > > > https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-nsh-06
 > > >
 > > >
 > > > Please note that it may take a couple of minutes from the time of
 > > submission
 > > > until the htmlized version and diff are available at tools.ietf.org.
 > > >
 > > > Internet-Drafts are also available by anonymous FTP at:
 > > > ftp://ftp.ietf.org/internet-drafts/
 > > >

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |      Owner:  draft-ietf-sfc-
  mohamed.boucadair@orange.com       |  nsh@tools.ietf.org
     Type:  defect                   |     Status:  new
 Priority:  major                    |  Milestone:
Component:  nsh                      |    Version:
 Severity:  Active WG Document       |   Keywords:
-------------------------------------+-------------------------------------

Ticket URL: <https://trac.tools.ietf.org/wg/sfc/trac/ticket/23>
sfc <https://tools.ietf.org/sfc/>


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#24: -07 review (M. Boucadair)

 I'm adding this review to the tracker as I'm not sure all the points were
 addressed.

 ==
 Hi Jim, all,

 Likewise, I would like to see this document progress as well.

 In addition to the comment raised in a separate message about the C-bit of
 TLVs, I have the following comments:

 (1) Section 2: I suggest to delete the following sentence:

    NSH is designed to be easy to implement across a range of devices,
    both physical and virtual, including hardware platforms.

 Reason: the use of "easy to implement" should be justified if that text is
 maintained. Otherwise, this is subjective.

 or to reword it as follows:

    "NSH can be implemented in both physical and virtual platforms."

 (2) Section 2.3: I suggest to change this OLD text:

 The semantics of
        the shared metadata is communicated via a control plane, which is
        outside the scope of this document, to participating nodes.

 NEW:

 The semantics of
 the shared metadata is communicated via a control plane (Section 3.3 of
 [I-D.ietf-sfc-control-plane]).

 (3) Section 2.3- Not sure I would maintain this text:

    5.  NSH offers a common and standards-based header for service
        chaining to all network and service nodes.

 "to all" is not accurate as "legacy" nodes are still there.

 (4) Section 2.3:

 OLD:
 Transport Agnostic: NSH is transport independent and is often
        carried via a network transport protocol,

 NEW:
 Transport Agnostic: NSH is transport independent. Any network transport
 protocol can be used to transport NSH-encapsulated traffic.

 (5) Section 3.2:

    NSH implementations MUST support MD-Type = 0x1, and SHOULD support
    MD- Type = 0x2.

 Because:
 * of potential interoperability issues.
 * MD#2 is more compact when no metadata is to be supplied
 * MD#2 allows to convey more information compared to MD#1

 I suggest we revisit that sentence to have MD#2 be mandatory to be
 supported (my favorite option), or at least require that both MDs defined
 in this spec MUST be supported.

 (6) Section 3.2:

    C bit: Indicates that a critical metadata TLV is present.  This bit
    acts as an indication for hardware implementers to decide how to
    handle the presence of a critical TLV without necessarily needing to
    parse all TLVs present.  For an MD Type of 0x1 (i.e. no variable
    length metadata is present), the C bit MUST be set to 0x0.

 6.1. What is the behavior of the implementation if C-bit is set but not
 critical metadata is found in the payload?
 6.2. What is the behavior of the implementation if C-bit is unset but a
 critical metadata is found in the payload?
 6.3. What is the behavior of the implementation with regards to this bit
 if a critical metadata is added in-path?
 6.4. What is the behavior of the implementation with regards to this bit
 if a critical metadata is stripped in-path?
 6.5. Should the specification recommend an order of metadata so that
 critical metadata are always positioned first?

 (7) Section 3.3: The following text

 " ... however the
    control plane MAY configure the initial value of SI as appropriate
    (i.e. taking into account the length of the service function path). "

 is not aligned with the outcome of the discussion we had during the WG LC
 of draft-ietf-sfc-control-plane (https://www.ietf.org/mail-
 archive/web/sfc/current/msg04594.html):

    The control plane must instruct the classifier about the initial
    values of the Service Index (SI).

 7.1. I suggest to modify NSH draft accordingly.
 7.2. Please consider adding a reference to draft-ietf-sfc-control-plane

 (8) Section 3.4: I still do think this section is underspecified. E.g.,

 8.1. The use of "Mandatory Context Header" conflicts with this text in
 Section 3:

    A Network Service Header (NSH) contains service path information and
    optionally metadata that are added to a packet or frame and used to
    ^^^^^^^^^^^^^^^^^^^
    create a service plane.

 8.2. The specification does not forbid that all context headers are set to
 zero. Otherwise, MD#2 should be used instead.
 8.3. The specification does not specify how these context headers are to
 be validated.
 8.4. I still don't understand why four headers are chosen.

 (9) Section 3.5.1:

 The length of "Metadata Class" is over-dimensioned. I suggest to reduce
 the length of this field and increase the length of "Type".

 For example, let's consider the proposal in https://tools.ietf.org/html
 /draft-napper-sfc-nsh-broadband-allocation-00#section-4.2:

     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |     TLV Class = 3GPP          |C|    Type     |R|R|R|   Len   |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |    Data ...
    +-+-+-+-+-+-+-+-+

                          Figure 5: TLV Allocation

    The intended use of the header is for TLVs associated with 3GPP Radio
    Access Networks as described in [TS.29.230].  This TLV can be used by
    3GPP to extend the metadata as per use cases.  Having this TLV helps
    to carry more information that does not fit within the MD Type 0x01.

 The list of codes in Table 7.1 of TS.29.230 cannot be conveyed with a
 "Type" field of 7 bits.

 (10) Section 4:

 OLD:

 +---------------+------------------+-------+----------------+---------+
  |                |  Insert         |Select |   Update       |Service  |
  |                |  or remove NSH  |Service|    NSH         |policy   |
  |                |                 |Function|               |selection|
  | Component      +--------+--------+Path   +----------------+         |
  |                |        |        |       | Dec.   |Update |         |
  |                | Insert | Remove |       |Service |Context|         |
  |                |        |        |       | Index  |Header |         |
  +----------------+--------+--------+-------+--------+-------+---------+
  |                |   +    |   +    |       |        |   +   |         |
  |Classifier      |        |        |       |        |       |         |
  +--------------- +--------+--------+-------+--------+-------+---------+
  |Service Function|        |   +    |  +    |        |       |         |
  |Forwarder(SFF)  |        |        |       |        |       |         |
  +--------------- +--------+--------+-------+--------+-------+---------+
  |Service         |        |        |       |   +    |   +   |   +     |
  |Function  (SF)  |        |        |       |        |       |         |
  +--------------- +--------+--------+-------+--------+-------+---------+
  |SFC Proxy       |   +    |   +    |       |   +    |       |         |
  +----------------+--------+--------+-------+--------+-------+---------+

 NEW:

 +---------------+------------------+-------+----------------+---------+
  |                |  Insert         |Select |   Update       |Service  |
  |                |  or remove NSH  |Service|    NSH         |policy   |
  |                |                 |Function|               |selection|
  | Component      +--------+--------+Path   +----------------+         |
  |                |        |        |       | Dec.   |Update |         |
  |                | Insert | Remove |       |Service |Context|         |
  |                |        |        |       | Index  |Header |         |
  +----------------+--------+--------+-------+--------+-------+---------+
  |                |   +    |   +    |       |        |   +   |         |
  |Classifier      |        |        |       |        |       |         |
  +--------------- +--------+--------+-------+--------+-------+---------+
  |Service Function|        |   +    |  +    |        |       |         |
  |Forwarder(SFF)  |        |        |       |        |       |         |
  +--------------- +--------+--------+-------+--------+-------+---------+
  |Service         |        |        |       |   +    |   +   |   +     |
  |Function  (SF)  |        |        |       |        |       |         |
  +--------------- +--------+--------+-------+--------+-------+---------+
  |SFC Proxy       |   +    |   +    |       |   +    |   +   |         |
  +----------------+--------+--------+-------+--------+-------+---------+

 (11) Section 7.2: Please consider adding an IPv6 example.

 Thank you.

 Cheers,
 Med

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |      Owner:  draft-ietf-sfc-
  mohamed.boucadair@orange.com       |  nsh@tools.ietf.org
     Type:  defect                   |     Status:  new
 Priority:  major                    |  Milestone:
Component:  nsh                      |    Version:
 Severity:  -                        |   Keywords:
-------------------------------------+-------------------------------------

Ticket URL: <https://trac.tools.ietf.org/wg/sfc/trac/ticket/24>
sfc <https://tools.ietf.org/sfc/>


From nobody Tue Oct 25 06:03:18 2016
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From: Ron Parker <Ron_Parker@affirmednetworks.com>
To: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, "Lucy yong" <lucy.yong@huawei.com>, "Paul Quinn (paulq)" <paulq@cisco.com>
Thread-Topic: [sfc] metadata type 1 constraint
Thread-Index: AQHSK+1YeaRWfqA3lEm1Wn4dHGNHOqC4lvyAgAA99ICAAHIbgP//3zwg
Date: Tue, 25 Oct 2016 13:02:57 +0000
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Subject: Re: [sfc] metadata type 1 constraint
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From nobody Tue Oct 25 06:32:53 2016
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From: Ron Parker <Ron_Parker@affirmednetworks.com>
To: "wang.cui1@zte.com.cn" <wang.cui1@zte.com.cn>, "Joel M. Halpern" <jmh@joelhalpern.com>, "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
Thread-Topic: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
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Date: Tue, 25 Oct 2016 13:32:43 +0000
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Cc: Dave Dolson <ddolson@sandvine.com>, "sfc@ietf.org" <sfc@ietf.org>, sfc <sfc-bounces@ietf.org>
Subject: Re: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
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<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">Linda,<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
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libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">If we do, =
indeed, set the MD-1 encoding schema ID into the NSH, itself, it doesn=A1=
=AFt seem like 2 bits would be adequate.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
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;</o:p></span></p>
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libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">Perhaps th=
e fixed 16 bytes should grow to include a prepend byte(s) that identifies t=
he encoding schema.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
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libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US">&nbsp;&nbs=
p; Ron<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><a name=3D"_MailEndCompose"><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D;mso-fareas=
t-language:EN-US"><o:p>&nbsp;</o:p></span></a></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> sfc [mailto:sfc-bounces@ietf.o=
rg]
<b>On Behalf Of </b>wang.cui1@zte.com.cn<br>
<b>Sent:</b> Monday, October 24, 2016 10:37 PM<br>
<b>To:</b> Joel M. Halpern &lt;jmh@joelhalpern.com&gt;; Van De Velde, Gunte=
r (Nokia - BE) &lt;gunter.van_de_velde@nokia.com&gt;<br>
<b>Cc:</b> sfc &lt;sfc-bounces@ietf.org&gt;; sfc@ietf.org; Ron Parker &lt;R=
on_Parker@affirmednetworks.com&gt;; Dave Dolson &lt;ddolson@sandvine.com&gt=
;<br>
<b>Subject:</b> Re: [sfc] New Version Notification for draft-vandevelde-sfc=
-nsh-length-overload-00.txt<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Calibri&quot;,sans-=
serif">Dear all,</span>
<br>
<span style=3D"font-family:&quot;Calibri&quot;,sans-serif">&nbsp; </span><b=
r>
<span style=3D"font-family:&quot;Calibri&quot;,sans-serif">&nbsp; &nbsp;In =
fact, there is also another solution to address this problem proposed in a =
previous draft
</span><a href=3D"https://tools.ietf.org/html/draft-wang-sfc-md-type-issues=
-02"><span style=3D"font-family:&quot;Calibri&quot;,sans-serif">https://too=
ls.ietf.org/html/draft-wang-sfc-md-type-issues-02</span></a><span style=3D"=
font-family:&quot;Calibri&quot;,sans-serif">.
</span><br>
<span style=3D"font-family:&quot;Calibri&quot;,sans-serif">It also proposed=
 to add some bits in NSH, such as reserving 2 bits in the MD-Type field, to=
 identify the exact meaning of the Mandatory Context Headers.</span>
<br>
<span style=3D"font-family:&quot;Calibri&quot;,sans-serif">This solution do=
n't bother the length field as well as the MD-type=3D1/2. But is requires t=
he original MD Type field to make 2 bits room for this purpose.</span>
<br>
<br>
<span style=3D"font-family:&quot;Calibri&quot;,sans-serif">&nbsp; &nbsp;On =
the other hand, I do agree that, both draft-wang-sfc-md-type-issues-02 and =
draft-vandevelds-sfc-nsh-overload try to propose the issue, we may agree/di=
sagree</span>
<br>
<span style=3D"font-family:&quot;Calibri&quot;,sans-serif">on the different=
 approaches, but there should find a agreeable solution for how to understa=
nd the exact meaning in the Mandatory Context Headers fields in mixed scena=
rios.</span>
<br>
<br>
<span style=3D"font-family:&quot;Calibri&quot;,sans-serif">BRs,</span> <br>
<span style=3D"font-family:&quot;Calibri&quot;,sans-serif">Linda Wang</span=
> <br>
<br>
<tt><span style=3D"font-size:10.0pt">&quot;sfc&quot; &lt;<a href=3D"mailto:=
sfc-bounces@ietf.org">sfc-bounces@ietf.org</a>&gt;
<span lang=3D"ZH-CN">=D0=B4=D3=DA</span> 2016/10/18 10:10:35:</span></tt><s=
pan style=3D"font-size:10.0pt"><br>
<br>
<tt>&gt; &quot;Joel M. Halpern&quot; &lt;<a href=3D"mailto:jmh@joelhalpern.=
com">jmh@joelhalpern.com</a>&gt;
</tt></span><br>
<tt><span style=3D"font-size:10.0pt">&gt; <span lang=3D"ZH-CN">=B7=A2=BC=FE=
=C8=CB</span>: &nbsp;&quot;sfc&quot; &lt;<a href=3D"mailto:sfc-bounces@ietf=
.org">sfc-bounces@ietf.org</a>&gt;</span></tt><span style=3D"font-size:10.0=
pt"><br>
<tt>&gt; </tt></span><br>
<tt><span style=3D"font-size:10.0pt">&gt; 2016/10/18 10:10</span></tt> <br>
<tt><span style=3D"font-size:10.0pt">&gt; </span></tt><span style=3D"font-s=
ize:10.0pt"><br>
<tt>&gt; <span lang=3D"ZH-CN">=CA=D5=BC=FE=C8=CB</span></tt></span> <br>
<tt><span style=3D"font-size:10.0pt">&gt; </span></tt><span style=3D"font-s=
ize:10.0pt"><br>
<tt>&gt; Dave Dolson &lt;<a href=3D"mailto:ddolson@sandvine.com">ddolson@sa=
ndvine.com</a>&gt;, Ron Parker
</tt><br>
<tt>&gt; &lt;<a href=3D"mailto:Ron_Parker@affirmednetworks.com">Ron_Parker@=
affirmednetworks.com</a>&gt;, &quot;Van De Velde, Gunter (Nokia -
</tt><br>
<tt>&gt; BE)&quot; &lt;<a href=3D"mailto:gunter.van_de_velde@nokia.com">gun=
ter.van_de_velde@nokia.com</a>&gt;, &quot;<a href=3D"mailto:sfc@ietf.org">s=
fc@ietf.org</a>&quot; &lt;<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a>&=
gt;,
</tt></span><br>
<tt><span style=3D"font-size:10.0pt">&gt; </span></tt><span style=3D"font-s=
ize:10.0pt"><br>
<tt>&gt; <span lang=3D"ZH-CN">=B3=AD=CB=CD</span></tt></span> <br>
<tt><span style=3D"font-size:10.0pt">&gt; </span></tt><span style=3D"font-s=
ize:10.0pt"><br>
<tt>&gt; <span lang=3D"ZH-CN">=D6=F7=CC=E2</span></tt></span> <br>
<tt><span style=3D"font-size:10.0pt">&gt; </span></tt><span style=3D"font-s=
ize:10.0pt"><br>
<tt>&gt; Re: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-</=
tt><br>
<tt>&gt; length-overload-00.txt</tt></span> <br>
<tt><span style=3D"font-size:10.0pt">&gt; </span></tt><span style=3D"font-s=
ize:10.0pt"><br>
<tt>&gt; I agree with Dave. &nbsp;The length field should always mean lengt=
h.</tt><br>
<tt>&gt; One of the strong benefits of this is that if there is a need (for=
 </tt><br>
<tt>&gt; logging, analysis, ...) to get to the data packet but not to under=
stand </tt>
<br>
<tt>&gt; the metadata, the length field always just works. &nbsp;This signi=
ficantly </tt>
<br>
<tt>&gt; simplifies many code paths.</tt><br>
<tt>&gt; </tt><br>
<tt>&gt; Yours,</tt><br>
<tt>&gt; Joel</tt><br>
<tt>&gt; </tt><br>
<tt>&gt; On 10/17/16 12:10 PM, Dave Dolson wrote:</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; I would prefer to see the length field always mean length, so=
 that</tt><br>
<tt>&gt; implementations not requiring metadata can just skip the metadata =
</tt><br>
<tt>&gt; regardless of MD type.</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; At the risk of stating the obvious, there already is an MD ty=
pe </tt><br>
<tt>&gt; field that can be used to discriminate metadata allocations. Value=
s </tt><br>
<tt>&gt; 3,4,5,... are available for different MD encodings.</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; -Dave</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; ________________________________________</tt><br>
<tt>&gt; &gt; From: sfc [sfc-bounces@ietf.org] on behalf of Ron Parker </tt=
><br>
<tt>&gt; [Ron_Parker@affirmednetworks.com]</tt><br>
<tt>&gt; &gt; Sent: Monday, October 17, 2016 10:50 AM</tt><br>
<tt>&gt; &gt; To: Van De Velde, Gunter (Nokia - BE); <a href=3D"mailto:sfc@=
ietf.org">sfc@ietf.org</a></tt><br>
<tt>&gt; &gt; Subject: Re: [sfc] New Version Notification for draft-vandeve=
lde-</tt><br>
<tt>&gt; sfc-nsh-length-overload-00.txt</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; Gunter,</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; I strongly support this proposal. &nbsp; It brings more speci=
ficity to </tt><br>
<tt>&gt; Type 1 which will undoubtedly improve interworking between differe=
nt</tt><br>
<tt>&gt; implementations and between different administrative domains.</tt>=
<br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp;Ron</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; -----Original Message-----</tt><br>
<tt>&gt; &gt; From: sfc [</tt></span><a href=3D"mailto:sfc-bounces@ietf.org=
"><tt><span style=3D"font-size:10.0pt">mailto:sfc-bounces@ietf.org</span></=
tt></a><tt><span style=3D"font-size:10.0pt">] On Behalf Of Van De Velde,</s=
pan></tt><span style=3D"font-size:10.0pt"><br>
<tt>&gt; Gunter (Nokia - BE)</tt><br>
<tt>&gt; &gt; Sent: Monday, October 17, 2016 5:15 AM</tt><br>
<tt>&gt; &gt; To: <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a></tt><br>
<tt>&gt; &gt; Subject: [GRAYMAIL] [sfc] FW: New Version Notification for dr=
aft-</tt><br>
<tt>&gt; vandevelde-sfc-nsh-length-overload-00.txt</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; Short text about overloading NSH length field for NSH MD Type=
-1 as</tt><br>
<tt>&gt; context allocation type, including proposal for backward compatibi=
lity.</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; G/</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; ------</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; On 17/10/2016, 10:05, &quot;<a href=3D"mailto:internet-drafts=
@ietf.org">internet-drafts@ietf.org</a>&quot; &lt;internet-</tt><br>
<tt>&gt; <a href=3D"mailto:drafts@ietf.org">drafts@ietf.org</a>&gt; wrote:<=
/tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; A new version of I-D, draft-vandevelde-sfc-nsh-=
length-overload-00.txt</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; has been successfully submitted by Gunter Van d=
e Velde and posted to the</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; IETF repository.</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; Name: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=
 &nbsp; draft-vandevelde-sfc-nsh-length-overload</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; Revision: &nbsp; 00</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; Title: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp=
; &nbsp;Network Services Header Context AllocationIdentifier</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; Document date: &nbsp; &nbsp; &nbsp;2016-10-17</=
tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; Group: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp=
; &nbsp;Individual Submission</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; Pages: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp=
; &nbsp;5</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; URL: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<=
/tt></span><a href=3D"https://www.ietf.org/internet-drafts/draft-"><tt><spa=
n style=3D"font-size:10.0pt">https://www.ietf.org/internet-drafts/draft-</s=
pan></tt></a><span style=3D"font-size:10.0pt"><br>
<tt>&gt; vandevelde-sfc-nsh-length-overload-00.txt</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; Status: &nbsp; &nbsp; &nbsp; &nbsp; </tt></span=
><a href=3D"https://datatracker.ietf.org/doc/draft-"><tt><span style=3D"fon=
t-size:10.0pt">https://datatracker.ietf.org/doc/draft-</span></tt></a><span=
 style=3D"font-size:10.0pt"><br>
<tt>&gt; vandevelde-sfc-nsh-length-overload/</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; Htmlized: &nbsp; &nbsp; &nbsp; </tt></span><a h=
ref=3D"https://tools.ietf.org/html/draft-vandevelde-"><tt><span style=3D"fo=
nt-size:10.0pt">https://tools.ietf.org/html/draft-vandevelde-</span></tt></=
a><span style=3D"font-size:10.0pt"><br>
<tt>&gt; sfc-nsh-length-overload-00</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; Abstract:</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; &nbsp; &nbsp;The specification of the NSH MD Ty=
pe 1 header [draft-ietf-sfc-nsh]</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; &nbsp; &nbsp;mandates four Context Headers, 4-b=
yte each, and they MUST be added</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; &nbsp; &nbsp;immediately following the Service =
Path Header. &nbsp;As direct</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; &nbsp; &nbsp;consequence, an NSH MD Type 1 head=
er is always Length 0x6 (six 4-byte</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; &nbsp; &nbsp;words). &nbsp;As a result, the Len=
gth field of the NSH MD Type 1 header</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; &nbsp; &nbsp;provides an information which is k=
nown by simply looking at the &quot;MD</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; &nbsp; &nbsp;Type&quot; field. &nbsp;However, w=
hile [draft-ietf-sfc-nsh] does not specify</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; &nbsp; &nbsp;the encoding of these Context Head=
ers, other specifications have</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; &nbsp; &nbsp;started to do so. &nbsp;A need to =
distinguish types of Context Headers</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; &nbsp; &nbsp;therefore arises.</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; &nbsp; &nbsp;This draft proposes to overload th=
e Length field of an NSH MD Type 1</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; &nbsp; &nbsp;as Meta-Data context allocation id=
entifier and to create a IANA</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; &nbsp; &nbsp;repository for NSH MD Type 1 alloc=
ation schemes. &nbsp;The NSH MD Type 1</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; &nbsp; &nbsp;Length field overload intends to a=
llow universal understanding at any</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; &nbsp; &nbsp;network location and by any networ=
k device of the context allocation</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; &nbsp; &nbsp;structure.</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; Please note that it may take a couple of minute=
s from the time</tt><br>
<tt>&gt; of submission</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; until the htmlized version and diff are availab=
le at tools.ietf.org.</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; &nbsp; &nbsp; The IETF Secretariat</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; _______________________________________________</tt><br>
<tt>&gt; &gt; sfc mailing list</tt><br>
<tt>&gt; &gt; <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a></tt><br>
<tt>&gt; &gt; </tt></span><a href=3D"https://www.ietf.org/mailman/listinfo/=
sfc"><tt><span style=3D"font-size:10.0pt">https://www.ietf.org/mailman/list=
info/sfc</span></tt></a><span style=3D"font-size:10.0pt"><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; _______________________________________________</tt><br>
<tt>&gt; &gt; sfc mailing list</tt><br>
<tt>&gt; &gt; <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a></tt><br>
<tt>&gt; &gt; </tt></span><a href=3D"https://www.ietf.org/mailman/listinfo/=
sfc"><tt><span style=3D"font-size:10.0pt">https://www.ietf.org/mailman/list=
info/sfc</span></tt></a><span style=3D"font-size:10.0pt"><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; &gt; _______________________________________________</tt><br>
<tt>&gt; &gt; sfc mailing list</tt><br>
<tt>&gt; &gt; <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a></tt><br>
<tt>&gt; &gt; </tt></span><a href=3D"https://www.ietf.org/mailman/listinfo/=
sfc"><tt><span style=3D"font-size:10.0pt">https://www.ietf.org/mailman/list=
info/sfc</span></tt></a><span style=3D"font-size:10.0pt"><br>
<tt>&gt; &gt;</tt><br>
<tt>&gt; </tt><br>
<tt>&gt; _______________________________________________</tt><br>
<tt>&gt; sfc mailing list</tt><br>
<tt>&gt; <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a></tt><br>
<tt>&gt; </tt></span><a href=3D"https://www.ietf.org/mailman/listinfo/sfc">=
<tt><span style=3D"font-size:10.0pt">https://www.ietf.org/mailman/listinfo/=
sfc</span></tt></a><o:p></o:p></p>
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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
Thread-Topic: [sfc] metadata type 1 constraint
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Cc: "Paul Quinn \(paulq\)" <paulq@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>, Lucy yong <lucy.yong@huawei.com>
Subject: Re: [sfc] metadata type 1 constraint
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Gunter,

There's clearly a trade off and a set of pros and cons for having a header =
being self-describing versus non-self-describing. Similarly, there's a bala=
nce in where we place state.

However, you are making some bold statements below, and I'd like to underst=
and some more. I'm not pushing a position, I just seem to be missing someth=
ing from your argument.

Saying that a non-self-describing packet / non stateless SF hurts interoper=
ability to the point of uselessness, is attaching that description to MPLS =
Labels or L2TPv3 encapsulation. Those don't have explicit indications.

You are advocating for an indication of allocation type in the packet. That=
's not unreasonable in itself, it is a sensible question.

But that is not "stateless" as you call it, because the SF still holds stat=
e indexed by SPI, and in any case would need to hold state on what each all=
ocation type means, which implicitly happens without an allocation type. Bo=
th need state, both need a control plane to work.

In other words, it seems to me that both (with or without an allocation typ=
e) have the *exact* same interoperability requirements and characteristics.=
 The details are different of course, but below seems like FUD.

So, without pushing for any particular method, I'd really would like to und=
erstand your technical rational in more details.

You say "marginally useable when interoperability", "dubious usefulness and=
 adds significant operational complexity", and "a formally standardized all=
ocation scheme". The latter should exist in both cases (whether you put it =
in the packet or not). And while I understand your preference of an explici=
t allocation type, I still do not understand why.

How exactly the current approach with interoperable running code hurts inte=
roperability?

Thumb typed by Carlos Pignataro.
Excuze typofraphicak errows

On Oct 25, 2016, at 00:55, Van De Velde, Gunter (Nokia - BE) <gunter.van_de=
_velde@nokia.com<mailto:gunter.van_de_velde@nokia.com>> wrote:

I agree with Lucy and Dave regarding the futile usefulness of MD#1.

The value of a fixed and predictable MD size is clear, however the lack of =
signalling to indicate in stateless manner the used NSH MD#1 allocation sch=
eme makes this type of NSH header only marginally useable when interoperabi=
lity of Service function behaviour is required or when a single SF needs to=
 service packets of different NSH MD#1 allocation scheme=92s.

The text proposed for adding to MD#1 is not fixing this, however it is maki=
ng it more clear to the user that MD#1 is from interoperability perspective=
 rather dubious and adds significant operational complexity.

If the intent is to make MD#1 more valuable and if we desire to bank upon t=
he benefits of a fixed size 16 octets context field, then maybe a compromis=
e needs to be made, and some effort be explored to add into the NSH MD#1 a =
context allocation scheme indication? Or, we create MD#3, MD#4, etc each ha=
ving a fixed 16-octet size and a formally documented and standardized alloc=
ation scheme.

G/

From: sfc <sfc-bounces@ietf.org<mailto:sfc-bounces@ietf.org>> on behalf of =
Lucy yong <lucy.yong@huawei.com<mailto:lucy.yong@huawei.com>>
Date: Tuesday, 25 October 2016 at 03:04
To: "Paul Quinn (paulq)" <paulq@cisco.com<mailto:paulq@cisco.com>>
Cc: "sfc@ietf.org<mailto:sfc@ietf.org>" <sfc@ietf.org<mailto:sfc@ietf.org>>
Subject: Re: [sfc] metadata type 1 constraint

Paul,

If NSH has to support MD-1 with 16-bytes datablock,  please consider adding=
 the additional text we proposed, which addresses interworking concern.

I think that for the MD-2, it also needs to add some rules about when a SFC=
-aware SF is configured to use metadata and receives MD-2, if it does not u=
nderstand the MD class and/or type, it MUST NOT process the packet, et al.

Lucy




From: Paul Quinn (paulq) [mailto:paulq@cisco.com]
Sent: Monday, October 24, 2016 4:23 PM
To: Lucy yong
Cc: sfc@ietf.org<mailto:sfc@ietf.org>
Subject: Re: [sfc] metadata type 1 constraint

Hi Lucy,

The value of a fixed size header as a MUST is significant from many perspec=
tives, including but not limited to:

Implementations, including software implementations, benefit form the predi=
ctability of a fixed size header. One only needs to look at the lack of wid=
ely deployed variable length data plane protocols to see this in practice.

>From an operational perspective, having a bounded (small) number of metadat=
a to work with helps to bound the policy expression, which after all is the=
 main use of the metadata.

There are existing implementations that demonstrate the applicability of MD=
 Type 1 to a wide-range of use cases, and those implementation reap the ben=
efits of the two aforementioned points.

Paul

On Oct 21, 2016, at 6:48 PM, Lucy yong <lucy.yong@huawei.com<mailto:lucy.yo=
ng@huawei.com>> wrote:

If we intend to standardize metadata structure per an SFC application, I wo=
nder why NSH needs MD#1? MD#2 can support all SFC needs. MD#2 even support =
expert review metadata class, experimental metadata class as well. Should c=
onsider removing MD#1?

Lucy

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Vigoureux, Martin (Nok=
ia - FR)
Sent: Friday, October 21, 2016 7:56 AM
To: Van De Velde, Gunter (Nokia - BE); Paul Quinn (paulq); Joel M. Halpern
Cc: sfc@ietf.org<mailto:sfc@ietf.org>
Subject: Re: [sfc] metadata type 1 constraint

>From the latest discussion I wonder if the allocation drafts shouldn't in f=
act define their own MD type (3, 4, ...).

If there is a need/use for that, a TLV for framing these MDs in MD2 could b=
e defined, as sfc-nsh-tlv now does.

I'd in any case prefer to avoid duplicating specifications across documents=
, and as such sfc-nsh-tlv should only reference the encodings, not replicat=
e them.

-m


-------- Message d'origine --------
De : "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com<mai=
lto:gunter.van_de_velde@nokia.com>>
Date :21/10/2016 14:36 (GMT+01:00)
=C0 : "Paul Quinn (paulq)" <paulq@cisco.com<mailto:paulq@cisco.com>>, "Joel=
 M. Halpern" <jmh@joelhalpern.com<mailto:jmh@joelhalpern.com>>
Cc : sfc@ietf.org<mailto:sfc@ietf.org>
Objet : Re: [sfc] metadata type 1 constraint
The good news is that draft draft-quinn-sfc-nsh-tlv-02.txt now has a fix su=
ggesting context allocation scheme encoding:

https://tools.ietf.org/rfcdiff?
  url1=3Dhttps://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-01.txt
  &url2=3Dhttps://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-02.txt

However, if the intent is that MD#1 is Opaque, then why even try to suggest=
 encodings for it? Opaque info is opaque info=85 either you define it, or y=
ou do not define it=85 anything else is confusing and contradicting from op=
erational and implementation perspective.

I would prefer to see that both =93Data Center Allocation=94 and =93Mobilit=
y/Broadband Allocation=94 drafts are written with intended main usage in a =
MD#2, instead of MD#1 as then it is a complete and interoperable allocation=
 scheme usage with significantly reduced operational overhead and restricti=
ons. Assuming the length of these allocation blobs fixed at 16 octets for p=
otentially stuffing them in a MD#1 sounds fine.

G/



On 19/10/2016, 17:22, "sfc on behalf of Van De Velde, Gunter (Nokia - BE)" =
<sfc-bounces@ietf.org on behalf of gunter.van_de_velde@nokia.com<mailto:sfc=
-bounces@ietf.org%20on%20behalf%20of%20gunter.van_de_velde@nokia.com>> wrot=
e:

    It is sad that we significantly increase the operational burden for all=
ocation scheme signalling for MD#1. I am dazzled the WG believes stateful s=
ignalling is easier for deployment compared with a stateless solution for M=
D#1. The imposed operational complexity is significant with current proposa=
l.

    G/




    On 19/10/2016, 15:33, "sfc on behalf of Paul Quinn (paulq)" <sfc-bounce=
s@ietf.org on behalf of paulq@cisco.com<mailto:sfc-bounces@ietf.org%20on%20=
behalf%20of%20paulq@cisco.com>> wrote:

        Joel,

        I agree with you: the current approach is simple and workable.  The=
 allocation scheme are simply information examples.

        Paul

        > On Oct 18, 2016, at 8:14 PM, Joel M. Halpern <jmh@joelhalpern.com=
<mailto:jmh@joelhalpern.com>> wrote:
        >
        > Our current approach is to allow definition of allocation schemes=
, but not to mandate any specific allocation scheme for MD-1.
        > That seems to me to be a good approach, workable, and what we hav=
e agreed and documented.
        >
        > Yours,
        > Joel
        >
        > On 10/18/16 12:09 PM, Van De Velde, Gunter (Nokia - BE) wrote:
        >> If NSH MD Type-1 defines for the metadata to be Opaque, then we =
should not make an effort to define it, and just tread it as Opaque content=
 imo and live with the consequences=85and in that case use MD Type-2 for th=
ese types of well known metadata transport mechanisms.
        >>
        >> If however, we decide to define the allocation schemes, then we =
should also architect an indicator for the used allocation scheme.
        >> At this point in time, there models were suggested (overload Len=
gth, overload MD type, use few bits of MD context data).
        >> I strongly believe there is value in having the metadata allocat=
ion structure signalled within the NSH itself, even for MD Type-1.
        >> (It avoids control plane signalling and creates state which need=
s to be maintained, and that sounds as a very expensive operation).
        >>
        >> Alternate is to just say as Lucy suggests, and restrict MD Type-=
1 Service Chain SF=92s per allocation scheme. This is a solution that works=
, albeit it is a very impacting restriction for flexibility and resource sh=
aring).
        >>
        >> G/
        >>
        >>
        >> On 18/10/2016, 16:49, "sfc on behalf of Lucy yong" <sfc-bounces@=
ietf.org on behalf of lucy.yong@huawei.com<mailto:sfc-bounces@ietf.org%20on=
%20behalf%20of%20lucy.yong@huawei.com>> wrote:
        >>
        >>    Comment on "Allocating a nibble or byte within the 32 bytes (=
probably the first nibble or byte) is yet another."
        >>
        >>    Lucy: Technically We can do this on MD#1, but NSH already def=
ines MD#2. Is the variable length the only feature that hardware can't deal=
 with?
        >>
        >>    Lucy
        >>
        >>    -----Original Message-----
        >>    From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
        >>    Sent: Tuesday, October 18, 2016 10:05 AM
        >>    To: Lucy yong; Joel M. Halpern; sfc@ietf.org<mailto:sfc@ietf.=
org>
        >>    Subject: RE: [sfc] metadata type 1 constraint
        >>
        >>    Even though the interpretation of metadata is dependent on co=
ntrol plane interaction, where I think the original proposal has value is t=
hat there might be multiple separate interpretations simultaneously within =
the same administrative domain.   A way to describe, on the wire, which of =
those interpretations is in force for that particular SFP seems valuable to=
 me.   You could definitely argue that the control plane could install the =
interpretation locally on a per SFP basis;  also being explicit on the wire=
 will likely enhance interoperability and debuggability.
        >>
        >>    The value would be locally significant within the administrat=
ive domain (i.e., metadata schema 1, metatadata schema 2, etc.).   Overload=
ing length is one way.   Overloading MD-type is another.   Allocating a nib=
ble or byte within the 32 bytes (probably the first nibble or byte) is yet =
another.
        >>
        >>       Ron
        >>
        >>
        >>    -----Original Message-----
        >>    From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Lucy yon=
g
        >>    Sent: Tuesday, October 18, 2016 10:27 AM
        >>    To: Joel M. Halpern <jmh@joelhalpern.com<mailto:jmh@joelhalpe=
rn.com>>; sfc@ietf.org<mailto:sfc@ietf.org>
        >>    Subject: Re: [sfc] metadata type 1 constraint
        >>
        >>    Joel,
        >>
        >>    Lucy, while your two text proposals are not wrong, I do not s=
ee them as adding any clarity to the document.  The sections are very short=
 and clearly define only the syntax.
        >>    [Lucy] True. However, for this document, readers expect Secti=
on 3 to describe NSH syntax and semantics. Section 3.1-3.3 do both. If sect=
ion 3.4 and 3.5 just specify the syntax, from documenting perspective, it i=
s important to explicitly state the two text out.
        >>
        >>    With regard to SF and MD-1 support, there is absolutely nothi=
ng that requires an SF to support only one MD-1 structure.  Rather, the con=
trol mechanisms will tell the SF how to extract the data it needs from the =
MD-1 header.
        >>    [Lucy] This puts much uncertainty for a single SF on what to =
implement, which causes people's concern. IMO, if we don't have a way to ad=
dress this challenge here (you stated in interim meeting), pushing it to an=
other place does not solve/address it. For example,  will the control mecha=
nisms tell an SF how to extract the data it needs from the MD-1 header per =
a SFP, or per a SFC, or for all SFC packets, or per payload flow, or combin=
ation of them? This will significantly impact SF implementation. The reason=
 having MD type 1 is that is hardware friendly. Leaving these uncertainty o=
pen, not sure if the reason still makes a sense.
        >>
        >>    Lucy
        >>    I believe there is already text in the control plane requirem=
ents document that describes the need for this control functionality.
        >>
        >>
        >>
        >>    Yours,
        >>    Joel
        >>
        >>    On 10/17/16 11:07 AM, Lucy yong wrote:
        >>    > Suggestions:
        >>    >
        >>    > Section 3.4 should mention that this section only defines M=
D type 1
        >>    > format. The semantics of MD Type 1 is outside the scope of =
this
        >>    > document. Thus, the use of MD type 1 is outside the scope o=
f this
        >>    > document.
        >>    >
        >>    > Section 3.5 should mention that this section only defines M=
EF type 2
        >>    > format. The semantics of MD type 2 is outside the scope of =
this
        >>    > document. Thus, the use of MD type 2 is outside the scope o=
f this
        >>    > documents.
        >>    >
        >>    > IMO: these statements are important for the sections.
        >>    >
        >>    > Joel, MD semantics is critical for SFs. More than one seman=
tics of MD
        >>    > type 1 MUST NOT be specified for a SF. This should be a req=
uirement in
        >>    > the SFC arch. as a result of NSH design's, but the architec=
ture is
        >>    > already published. Maybe control plane requirement is the p=
lace to
        >>    > state this out as the result of SFC arch and NSH design.
        >>    >
        >>    > Thanks, Lucy
        >>    >
        >>    > -----Original Message----- From: sfc [mailto:sfc-bounces@ie=
tf.org] On
        >>    > Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:=
39 PM To:
        >>    > Lucy yong; sfc@ietf.org<mailto:sfc@ietf.org> Subject: Re: [=
sfc] metadata type 1 constraint
        >>    >
        >>    > A) I woud not want to state any such constraint in the NSH =
document,
        >>    > because B) In fact, the SFP ID is in every NSH header.  So =
yes, there
        >>    > is context if it is needed
        >>    >
        >>    > It is true that MD-2 is more flexible than MD-1.  I don't t=
hink anyone
        >>    > disagrees with that.
        >>    >
        >>    > Yours, Joel
        >>    >
        >>    > On 10/16/16 3:25 PM, Lucy yong wrote:
        >>    >> RFC7665 (SFC architecture) states  "This architecture allo=
ws an SF to
        >>    >> be part of multiple SFPs and SFCs."
        >>    >>
        >>    >>
        >>    >>
        >>    >> NSH just specifies MD type1 with a 16 bytes field, and  NS=
H doc.
        >>    >> states
        >>    >>
        >>    >> 3.  NSH provides a mechanism to carry shared metadata betw=
een
        >>    >>
        >>    >> participating entities and service functions.  The semanti=
cs of
        >>    >>
        >>    >> the shared metadata is communicated via a control plane, w=
hich is
        >>    >>
        >>    >> outside the scope of this document, to participating nodes=
.
        >>    >>
        >>    >>
        >>    >>
        >>    >> Comments: this mean: when an SF that is part of multiple S=
FCs and MD
        >>    >> type 1 is used in some of SFCs, these SFCs MUST have the s=
ame
        >>    >> metadata semantics.  This is because that NSH does not con=
vey SFC
        >>    >> identifier. For MD type 2, different SFCs may insert diffe=
rent list
        >>    >> of TLVs and each TLV has a type and specified semantics al=
ong (the
        >>    >> TLVs will be specified in different doc.).
        >>    >>
        >>    >>
        >>    >>
        >>    >> Should we state out this constraint in NSH doc.
        >>    >>
        >>    >>
        >>    >>
        >>    >> Lucy
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >> _______________________________________________ sfc mailin=
g list
        >>    >> sfc@ietf.org<mailto:sfc@ietf.org> https://www.ietf.org/mai=
lman/listinfo/sfc
        >>    >>
        >>    >
        >>    > _______________________________________________ sfc mailing=
 list
        >>    > sfc@ietf.org<mailto:sfc@ietf.org> https://www.ietf.org/mail=
man/listinfo/sfc
        >>    >
        >>
        >>    _______________________________________________
        >>    sfc mailing list
        >>    sfc@ietf.org<mailto:sfc@ietf.org>
        >>    https://www.ietf.org/mailman/listinfo/sfc
        >>
        >>    _______________________________________________
        >>    sfc mailing list
        >>    sfc@ietf.org<mailto:sfc@ietf.org>
        >>    https://www.ietf.org/mailman/listinfo/sfc
        >>
        >>
        >
        > _______________________________________________
        > sfc mailing list
        > sfc@ietf.org<mailto:sfc@ietf.org>
        > https://www.ietf.org/mailman/listinfo/sfc

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


    _______________________________________________
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_______________________________________________
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--_000_6F0E435A47EA435FAC3D7262FEC4FEF3ciscocom_
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<div>Gunter,</div>
<div id=3D"AppleMailSignature"><br>
</div>
<div id=3D"AppleMailSignature">There's clearly a trade off and a set of pro=
s and cons for having a header being self-describing versus non-self-descri=
bing. Similarly, there's a balance in where we place state.&nbsp;</div>
<div id=3D"AppleMailSignature"><br>
</div>
<div id=3D"AppleMailSignature">However, you are making some bold statements=
 below, and I'd like to understand some more. I'm not pushing a position, I=
 just seem to be missing something from your argument.&nbsp;</div>
<div id=3D"AppleMailSignature"><br>
</div>
<div id=3D"AppleMailSignature">Saying that a non-self-describing packet / n=
on stateless SF hurts interoperability to the point of uselessness, is atta=
ching that description to MPLS Labels or L2TPv3 encapsulation. Those don't =
have explicit indications.&nbsp;</div>
<div id=3D"AppleMailSignature"><br>
</div>
<div id=3D"AppleMailSignature">You are advocating for an indication of allo=
cation type in the packet. That's not unreasonable in itself, it is a sensi=
ble question.</div>
<div id=3D"AppleMailSignature"><br>
</div>
<div id=3D"AppleMailSignature">But that is not &quot;stateless&quot; as you=
 call it, because the SF still holds state indexed by SPI, and in any case =
would need to hold state on what each allocation type means, which implicit=
ly happens without an allocation type. Both
 need state, both need a control plane to work.&nbsp;</div>
<div id=3D"AppleMailSignature"><br>
</div>
<div id=3D"AppleMailSignature">In other words, it seems to me that both (wi=
th or without an allocation type) have the *exact* same interoperability re=
quirements and characteristics. The details are different of course, but be=
low seems like FUD.&nbsp;</div>
<div id=3D"AppleMailSignature"><br>
</div>
<div id=3D"AppleMailSignature">So, without pushing for any particular metho=
d, I'd really would like to understand your technical rational in more deta=
ils.&nbsp;</div>
<div id=3D"AppleMailSignature"><br>
</div>
<div id=3D"AppleMailSignature">You say &quot;marginally useable when intero=
perability&quot;, &quot;dubious usefulness and adds significant operational=
 complexity&quot;, and &quot;a formally standardized allocation scheme&quot=
;. The latter should exist in both cases (whether you put it in
 the packet or not). And while I understand your preference of an explicit =
allocation type, I still do not understand why.&nbsp;</div>
<div id=3D"AppleMailSignature"><br>
</div>
<div id=3D"AppleMailSignature">How exactly the current approach with intero=
perable running code hurts interoperability?<br>
<br>
<span class=3D"Apple-style-span" style=3D"-webkit-tap-highlight-color: rgba=
(26, 26, 26, 0.296875); -webkit-composition-fill-color: rgba(175, 192, 227,=
 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469); =
">Thumb typed by Carlos Pignataro.</span>
<div><span class=3D"Apple-style-span" style=3D"-webkit-tap-highlight-color:=
 rgba(26, 26, 26, 0.296875); -webkit-composition-fill-color: rgba(175, 192,=
 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.2304=
69); ">Excuze typofraphicak errows</span></div>
</div>
<div><br>
On Oct 25, 2016, at 00:55, Van De Velde, Gunter (Nokia - BE) &lt;<a href=3D=
"mailto:gunter.van_de_velde@nokia.com">gunter.van_de_velde@nokia.com</a>&gt=
; wrote:<br>
<br>
</div>
<blockquote type=3D"cite">
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<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">I agree with Lucy and Dave regarding the futile=
 usefulness of MD#1.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">The value of a fixed and predictable MD size is=
 clear, however the lack of signalling to indicate in stateless manner the =
used NSH MD#1 allocation scheme makes
 this type of NSH header only marginally useable when interoperability of S=
ervice function behaviour is required or when a single SF needs to service =
packets of different NSH MD#1 allocation scheme=92s.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">The text proposed for adding to MD#1 is not fix=
ing this, however it is making it more clear to the user that MD#1 is from =
interoperability perspective rather
 dubious and adds significant operational complexity. <o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">If the intent is to make MD#1 more valuable and=
 if we desire to bank upon the benefits of a fixed size 16 octets context f=
ield, then maybe a compromise needs
 to be made, and some effort be explored to add into the NSH MD#1 a context=
 allocation scheme indication? Or, we create MD#3, MD#4, etc each having a =
fixed 16-octet size and a formally documented and standardized allocation s=
cheme.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">G/<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-family:Calibri;color:black">F=
rom: </span>
</b><span style=3D"font-family:Calibri;color:black">sfc &lt;<a href=3D"mail=
to:sfc-bounces@ietf.org">sfc-bounces@ietf.org</a>&gt; on behalf of Lucy yon=
g &lt;<a href=3D"mailto:lucy.yong@huawei.com">lucy.yong@huawei.com</a>&gt;<=
br>
<b>Date: </b>Tuesday, 25 October 2016 at 03:04<br>
<b>To: </b>&quot;Paul Quinn (paulq)&quot; &lt;<a href=3D"mailto:paulq@cisco=
.com">paulq@cisco.com</a>&gt;<br>
<b>Cc: </b>&quot;<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a>&quot; &lt=
;<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a>&gt;<br>
<b>Subject: </b>Re: [sfc] metadata type 1 constraint<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">Paul,</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">If NSH has to support MD-1 with 16-bytes datablock, &nbsp=
;please consider adding the additional text we proposed, which addresses in=
terworking concern.</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">I think that for the MD-2, it also needs to add some rule=
s about when a SFC-aware SF is configured to use metadata and receives MD-2=
, if it does not understand the MD class
 and/or type, it MUST NOT process the packet, et al.</span></i><o:p></o:p><=
/p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">Lucy</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:Tahom=
a">From:</span></b><span style=3D"font-size:10.0pt;font-family:Tahoma"> Pau=
l Quinn (paulq) [<a href=3D"mailto:paulq@cisco.com">mailto:paulq@cisco.com<=
/a>]
<br>
<b>Sent:</b> Monday, October 24, 2016 4:23 PM<br>
<b>To:</b> Lucy yong<br>
<b>Cc:</b> <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<b>Subject:</b> Re: [sfc] metadata type 1 constraint</span><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div>
<p class=3D"MsoNormal">Hi Lucy, <o:p></o:p></p>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">The value of a fixed size header as a MUST is signif=
icant from many perspectives, including but not limited to:<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Implementations, including software implementations,=
 benefit form the predictability of a fixed size header. One only needs to =
look at the lack of widely deployed variable length data plane protocols to=
 see this in practice.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">From an operational perspective, having a bounded (s=
mall) number of metadata to work with helps to bound the policy expression,=
 which after all is the main use of the metadata.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">There are existing implementations that demonstrate =
the applicability of MD Type 1 to a wide-range of use cases, and those impl=
ementation reap the benefits of the two aforementioned points.<o:p></o:p></=
p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Paul<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal">On Oct 21, 2016, at 6:48 PM, Lucy yong &lt;<a href=
=3D"mailto:lucy.yong@huawei.com">lucy.yong@huawei.com</a>&gt; wrote:<o:p></=
o:p></p>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">If we intend to standardize metadata structure per an SFC=
 application, I wonder why NSH needs MD#1? MD#2 can support all SFC needs. =
MD#2 even support expert review metadata
 class, experimental metadata class as well. Should consider removing MD#1?=
</span></i><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">Lucy</span></i><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
</div>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<div>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:Tahom=
a">From:</span></b><span class=3D"apple-converted-space"><span style=3D"fon=
t-size:10.0pt;font-family:Tahoma">&nbsp;</span></span><span style=3D"font-s=
ize:10.0pt;font-family:Tahoma">sfc [<a href=3D"mailto:sfc-bounces@ietf.org"=
><span style=3D"color:purple">mailto:sfc-bounces@ietf.org</span></a>]<span =
class=3D"apple-converted-space">&nbsp;</span><b>On
 Behalf Of<span class=3D"apple-converted-space">&nbsp;</span></b>Vigoureux,=
 Martin (Nokia - FR)<br>
<b>Sent:</b><span class=3D"apple-converted-space">&nbsp;</span>Friday, Octo=
ber 21, 2016 7:56 AM<br>
<b>To:</b><span class=3D"apple-converted-space">&nbsp;</span>Van De Velde, =
Gunter (Nokia - BE); Paul Quinn (paulq); Joel M. Halpern<br>
<b>Cc:</b><span class=3D"apple-converted-space">&nbsp;</span><a href=3D"mai=
lto:sfc@ietf.org"><span style=3D"color:purple">sfc@ietf.org</span></a><br>
<b>Subject:</b><span class=3D"apple-converted-space">&nbsp;</span>Re: [sfc]=
 metadata type 1 constraint</span><o:p></o:p></p>
</div>
</div>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal">From the latest discussion I wonder if the allocatio=
n drafts shouldn't in fact define their own MD type (3, 4, ...).<br>
<br>
If there is a need/use for that, a TLV for framing these MDs in MD2 could b=
e defined, as sfc-nsh-tlv now does.<br>
<br>
I'd in any case prefer to avoid duplicating specifications across documents=
, and as such sfc-nsh-tlv should only reference the encodings, not replicat=
e them.<br>
<br>
-m<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><br>
<br>
-------- Message d'origine --------<br>
De : &quot;Van De Velde, Gunter (Nokia - BE)&quot; &lt;<a href=3D"mailto:gu=
nter.van_de_velde@nokia.com"><span style=3D"color:purple">gunter.van_de_vel=
de@nokia.com</span></a>&gt;<span class=3D"apple-converted-space">&nbsp;</sp=
an><br>
Date :21/10/2016 14:36 (GMT&#43;01:00)<span class=3D"apple-converted-space"=
>&nbsp;</span><br>
=C0 : &quot;Paul Quinn (paulq)&quot; &lt;<a href=3D"mailto:paulq@cisco.com"=
><span style=3D"color:purple">paulq@cisco.com</span></a>&gt;, &quot;Joel M.=
 Halpern&quot; &lt;<a href=3D"mailto:jmh@joelhalpern.com"><span style=3D"co=
lor:purple">jmh@joelhalpern.com</span></a>&gt;<span class=3D"apple-converte=
d-space">&nbsp;</span><br>
Cc :<span class=3D"apple-converted-space">&nbsp;</span><a href=3D"mailto:sf=
c@ietf.org"><span style=3D"color:purple">sfc@ietf.org</span></a><span class=
=3D"apple-converted-space">&nbsp;</span><br>
Objet : Re: [sfc] metadata type 1 constraint<span class=3D"apple-converted-=
space">&nbsp;</span><o:p></o:p></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt">The good news is th=
at draft draft-quinn-sfc-nsh-tlv-02.txt now has a fix suggesting context al=
location scheme encoding:<br>
<br>
<a href=3D"https://tools.ietf.org/rfcdiff?"><span style=3D"color:purple">ht=
tps://tools.ietf.org/rfcdiff?</span></a><br>
&nbsp; url1=3D<a href=3D"https://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-=
01.txt"><span style=3D"color:purple">https://tools.ietf.org/id/draft-quinn-=
sfc-nsh-tlv-01.txt</span></a><br>
&nbsp; &amp;url2=3D<a href=3D"https://tools.ietf.org/id/draft-quinn-sfc-nsh=
-tlv-02.txt"><span style=3D"color:purple">https://tools.ietf.org/id/draft-q=
uinn-sfc-nsh-tlv-02.txt</span></a><br>
<br>
However, if the intent is that MD#1 is Opaque, then why even try to suggest=
 encodings for it? Opaque info is opaque info=85 either you define it, or y=
ou do not define it=85 anything else is confusing and contradicting from op=
erational and implementation perspective.<br>
<br>
I would prefer to see that both =93Data Center Allocation=94 and =93Mobilit=
y/Broadband Allocation=94 drafts are written with intended main usage in a =
MD#2, instead of MD#1 as then it is a complete and interoperable allocation=
 scheme usage with significantly reduced
 operational overhead and restrictions. Assuming the length of these alloca=
tion blobs fixed at 16 octets for potentially stuffing them in a MD#1 sound=
s fine.<span class=3D"apple-converted-space">&nbsp;</span><br>
<br>
G/<br>
<br>
<br>
<br>
On 19/10/2016, 17:22, &quot;sfc on behalf of Van De Velde, Gunter (Nokia - =
BE)&quot; &lt;<a href=3D"mailto:sfc-bounces@ietf.org%20on%20behalf%20of%20g=
unter.van_de_velde@nokia.com"><span style=3D"color:purple">sfc-bounces@ietf=
.org on behalf of gunter.van_de_velde@nokia.com</span></a>&gt;
 wrote:<br>
<br>
&nbsp;&nbsp;&nbsp; It is sad that we significantly increase the operational=
 burden for allocation scheme signalling for MD#1. I am dazzled the WG beli=
eves stateful signalling is easier for deployment compared with a stateless=
 solution for MD#1. The imposed operational complexity
 is significant with current proposal.<br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp; G/<br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span>=
<br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp; On 19/10/2016, 15:33, &quot;sfc on behalf of Paul Quinn =
(paulq)&quot; &lt;<a href=3D"mailto:sfc-bounces@ietf.org%20on%20behalf%20of=
%20paulq@cisco.com"><span style=3D"color:purple">sfc-bounces@ietf.org on be=
half of paulq@cisco.com</span></a>&gt; wrote:<br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Joel,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-sp=
ace">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I agree with you: the current ap=
proach is simple and workable.&nbsp; The allocation scheme are simply infor=
mation examples.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-sp=
ace">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Paul<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-sp=
ace">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; On Oct 18, 2016, at 8:14 PM=
, Joel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.com"><span style=3D=
"color:purple">jmh@joelhalpern.com</span></a>&gt; wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;<span class=3D"apple-convert=
ed-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Our current approach is to =
allow definition of allocation schemes, but not to mandate any specific all=
ocation scheme for MD-1.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; That seems to me to be a go=
od approach, workable, and what we have agreed and documented.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;<span class=3D"apple-convert=
ed-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Yours,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Joel<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;<span class=3D"apple-convert=
ed-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; On 10/18/16 12:09 PM, Van D=
e Velde, Gunter (Nokia - BE) wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; If NSH MD Type-1 define=
s for the metadata to be Opaque, then we should not make an effort to defin=
e it, and just tread it as Opaque content imo and live with the consequence=
s=85and in that case use MD Type-2 for these types of well known metadata t=
ransport
 mechanisms.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; If however, we decide t=
o define the allocation schemes, then we should also architect an indicator=
 for the used allocation scheme.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; At this point in time, =
there models were suggested (overload Length, overload MD type, use few bit=
s of MD context data).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; I strongly believe ther=
e is value in having the metadata allocation structure signalled within the=
 NSH itself, even for MD Type-1.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; (It avoids control plan=
e signalling and creates state which needs to be maintained, and that sound=
s as a very expensive operation).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; Alternate is to just sa=
y as Lucy suggests, and restrict MD Type-1 Service Chain SF=92s per allocat=
ion scheme. This is a solution that works, albeit it is a very impacting re=
striction for flexibility and resource sharing).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; G/<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; On 18/10/2016, 16:49, &=
quot;sfc on behalf of Lucy yong&quot; &lt;<a href=3D"mailto:sfc-bounces@iet=
f.org%20on%20behalf%20of%20lucy.yong@huawei.com"><span style=3D"color:purpl=
e">sfc-bounces@ietf.org on behalf of lucy.yong@huawei.com</span></a>&gt; wr=
ote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Comme=
nt on &quot;Allocating a nibble or byte within the 32 bytes (probably the f=
irst nibble or byte) is yet another.&quot;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy:=
 Technically We can do this on MD#1, but NSH already defines MD#2. Is the v=
ariable length the only feature that hardware can't deal with?<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; -----=
Original Message-----<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; From:=
 Ron Parker [<a href=3D"mailto:Ron_Parker@affirmednetworks.com"><span style=
=3D"color:purple">mailto:Ron_Parker@affirmednetworks.com</span></a>]<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Sent:=
 Tuesday, October 18, 2016 10:05 AM<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; To: L=
ucy yong; Joel M. Halpern;<span class=3D"apple-converted-space">&nbsp;</spa=
n><a href=3D"mailto:sfc@ietf.org"><span style=3D"color:purple">sfc@ietf.org=
</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Subje=
ct: RE: [sfc] metadata type 1 constraint<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Even =
though the interpretation of metadata is dependent on control plane interac=
tion, where I think the original proposal has value is that there might be =
multiple separate interpretations simultaneously within the same administra=
tive domain.&nbsp;&nbsp;
 A way to describe, on the wire, which of those interpretations is in force=
 for that particular SFP seems valuable to me.&nbsp;&nbsp; You could defini=
tely argue that the control plane could install the interpretation locally =
on a per SFP basis;&nbsp; also being explicit on
 the wire will likely enhance interoperability and debuggability.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; The v=
alue would be locally significant within the administrative domain (i.e., m=
etadata schema 1, metatadata schema 2, etc.).&nbsp;&nbsp; Overloading lengt=
h is one way.&nbsp;&nbsp; Overloading MD-type is another.&nbsp;&nbsp; Alloc=
ating a nibble or byte within the 32 bytes
 (probably the first nibble or byte) is yet another.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; Ron<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; -----=
Original Message-----<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; From:=
 sfc [<a href=3D"mailto:sfc-bounces@ietf.org"><span style=3D"color:purple">=
mailto:sfc-bounces@ietf.org</span></a>] On Behalf Of Lucy yong<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Sent:=
 Tuesday, October 18, 2016 10:27 AM<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; To: J=
oel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.com"><span style=3D"co=
lor:purple">jmh@joelhalpern.com</span></a>&gt;;<span class=3D"apple-convert=
ed-space">&nbsp;</span><a href=3D"mailto:sfc@ietf.org"><span style=3D"color=
:purple">sfc@ietf.org</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Subje=
ct: Re: [sfc] metadata type 1 constraint<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Joel,=
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy,=
 while your two text proposals are not wrong, I do not see them as adding a=
ny clarity to the document.&nbsp; The sections are very short and clearly d=
efine only the syntax.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; [Lucy=
] True. However, for this document, readers expect Section 3 to describe NS=
H syntax and semantics. Section 3.1-3.3 do both. If section 3.4 and 3.5 jus=
t specify the syntax, from documenting perspective, it is important to expl=
icitly state
 the two text out.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; With =
regard to SF and MD-1 support, there is absolutely nothing that requires an=
 SF to support only one MD-1 structure.&nbsp; Rather, the control mechanism=
s will tell the SF how to extract the data it needs from the MD-1 header.<b=
r>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; [Lucy=
] This puts much uncertainty for a single SF on what to implement, which ca=
uses people's concern. IMO, if we don't have a way to address this challeng=
e here (you stated in interim meeting), pushing it to another place does no=
t solve/address
 it. For example,&nbsp; will the control mechanisms tell an SF how to extra=
ct the data it needs from the MD-1 header per a SFP, or per a SFC, or for a=
ll SFC packets, or per payload flow, or combination of them? This will sign=
ificantly impact SF implementation. The
 reason having MD type 1 is that is hardware friendly. Leaving these uncert=
ainty open, not sure if the reason still makes a sense.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; I bel=
ieve there is already text in the control plane requirements document that =
describes the need for this control functionality.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Yours=
,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Joel<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; On 10=
/17/16 11:07 AM, Lucy yong wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Suggestions:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Section 3.4 should mention that this section only defines MD type 1<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
format. The semantics of MD Type 1 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
document. Thus, the use of MD type 1 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
document.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Section 3.5 should mention that this section only defines MEF type 2<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
format. The semantics of MD type 2 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
document. Thus, the use of MD type 2 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
documents.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
IMO: these statements are important for the sections.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Joel, MD semantics is critical for SFs. More than one semantics of MD<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
type 1 MUST NOT be specified for a SF. This should be a requirement in<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
the SFC arch. as a result of NSH design's, but the architecture is<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
already published. Maybe control plane requirement is the place to<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
state this out as the result of SFC arch and NSH design.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Thanks, Lucy<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
-----Original Message----- From: sfc [<a href=3D"mailto:sfc-bounces@ietf.or=
g"><span style=3D"color:purple">mailto:sfc-bounces@ietf.org</span></a>] On<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:39 PM To:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Lucy yong;<span class=3D"apple-converted-space">&nbsp;</span><a href=3D"mai=
lto:sfc@ietf.org"><span style=3D"color:purple">sfc@ietf.org</span></a><span=
 class=3D"apple-converted-space">&nbsp;</span>Subject: Re: [sfc] metadata t=
ype 1 constraint<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
A) I woud not want to state any such constraint in the NSH document,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
because B) In fact, the SFP ID is in every NSH header.&nbsp; So yes, there<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
is context if it is needed<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
It is true that MD-2 is more flexible than MD-1.&nbsp; I don't think anyone=
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
disagrees with that.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Yours, Joel<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
On 10/16/16 3:25 PM, Lucy yong wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; RFC7665 (SFC architecture) states&nbsp; &quot;This architecture allows =
an SF to<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; be part of multiple SFPs and SFCs.&quot;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; NSH just specifies MD type1 with a 16 bytes field, and&nbsp; NSH doc.<b=
r>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; states<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; 3.&nbsp; NSH provides a mechanism to carry shared metadata between<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; participating entities and service functions.&nbsp; The semantics of<br=
>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; the shared metadata is communicated via a control plane, which is<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; outside the scope of this document, to participating nodes.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; Comments: this mean: when an SF that is part of multiple SFCs and MD<br=
>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; type 1 is used in some of SFCs, these SFCs MUST have the same<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; metadata semantics.&nbsp; This is because that NSH does not convey SFC<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; identifier. For MD type 2, different SFCs may insert different list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; of TLVs and each TLV has a type and specified semantics along (the<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; TLVs will be specified in different doc.).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; Should we state out this constraint in NSH doc.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; Lucy<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; _______________________________________________ sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<span class=3D"apple-converted-space">&nbsp;</span><a href=3D"mailto:sfc=
@ietf.org"><span style=3D"color:purple">sfc@ietf.org</span></a><span class=
=3D"apple-converted-space">&nbsp;</span><a href=3D"https://www.ietf.org/mai=
lman/listinfo/sfc"><span style=3D"color:purple">https://www.ietf.org/mailma=
n/listinfo/sfc</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
_______________________________________________ sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
span class=3D"apple-converted-space">&nbsp;</span><a href=3D"mailto:sfc@iet=
f.org"><span style=3D"color:purple">sfc@ietf.org</span></a><span class=3D"a=
pple-converted-space">&nbsp;</span><a href=3D"https://www.ietf.org/mailman/=
listinfo/sfc"><span style=3D"color:purple">https://www.ietf.org/mailman/lis=
tinfo/sfc</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; _____=
__________________________________________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; sfc m=
ailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span><a href=3D"mailto:sfc@ietf.org=
"><span style=3D"color:purple">sfc@ietf.org</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span><a href=3D"https://www.ietf.or=
g/mailman/listinfo/sfc"><span style=3D"color:purple">https://www.ietf.org/m=
ailman/listinfo/sfc</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; _____=
__________________________________________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; sfc m=
ailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span><a href=3D"mailto:sfc@ietf.org=
"><span style=3D"color:purple">sfc@ietf.org</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span><a href=3D"https://www.ietf.or=
g/mailman/listinfo/sfc"><span style=3D"color:purple">https://www.ietf.org/m=
ailman/listinfo/sfc</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;<span class=3D"apple-convert=
ed-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; ___________________________=
____________________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;<span class=3D"apple-convert=
ed-space">&nbsp;</span><a href=3D"mailto:sfc@ietf.org"><span style=3D"color=
:purple">sfc@ietf.org</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;<span class=3D"apple-convert=
ed-space">&nbsp;</span><a href=3D"https://www.ietf.org/mailman/listinfo/sfc=
"><span style=3D"color:purple">https://www.ietf.org/mailman/listinfo/sfc</s=
pan></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-sp=
ace">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ________________________________=
_______________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-sp=
ace">&nbsp;</span><a href=3D"mailto:sfc@ietf.org"><span style=3D"color:purp=
le">sfc@ietf.org</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-sp=
ace">&nbsp;</span><a href=3D"https://www.ietf.org/mailman/listinfo/sfc"><sp=
an style=3D"color:purple">https://www.ietf.org/mailman/listinfo/sfc</span><=
/a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-sp=
ace">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp; _______________________________________________<br>
&nbsp;&nbsp;&nbsp; sfc mailing list<br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><a hre=
f=3D"mailto:sfc@ietf.org"><span style=3D"color:purple">sfc@ietf.org</span><=
/a><br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><a hre=
f=3D"https://www.ietf.org/mailman/listinfo/sfc"><span style=3D"color:purple=
">https://www.ietf.org/mailman/listinfo/sfc</span></a><br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
<br>
_______________________________________________<br>
sfc mailing list<br>
<a href=3D"mailto:sfc@ietf.org"><span style=3D"color:purple">sfc@ietf.org</=
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<a href=3D"https://www.ietf.org/mailman/listinfo/sfc"><span style=3D"color:=
purple">https://www.ietf.org/mailman/listinfo/sfc</span></a></span><o:p></o=
:p></p>
</div>
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</div>
</blockquote>
</div>
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To: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, "Lucy yong" <lucy.yong@huawei.com>, "Paul Quinn (paulq)" <paulq@cisco.com>
Thread-Topic: [sfc] metadata type 1 constraint
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Subject: Re: [sfc] metadata type 1 constraint
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From: "Jim Guichard (jguichar)" <jguichar@cisco.com>
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
Thread-Topic: [sfc] metadata type 1 constraint
Thread-Index: AdIn4xLyjD6K0BeCTVKJAwYgCy2h8QAXh0GAABw7gwAAFmfBAAAaeMAAAAFNfQAAAY+AgAAAsjiAABD2M4AAHfr+gP//qRoAgAL1koCAAGrogIAApZYAgASe44CAAD3zgIAAchuAgABxMwCAACGPgA==
Date: Tue, 25 Oct 2016 20:38:03 +0000
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Cc: "Paul Quinn \(paulq\)" <paulq@cisco.com>, Lucy yong <lucy.yong@huawei.com>, "sfc@ietf.org" <sfc@ietf.org>
Subject: Re: [sfc] metadata type 1 constraint
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--_000_F48FE667018246E58B0DDD7285C21624f5com_--


From nobody Wed Oct 26 00:15:34 2016
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To: wang.cui1@zte.com.cn, "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
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From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Cc: sfc <sfc-bounces@ietf.org>, "sfc@ietf.org" <sfc@ietf.org>, Ron Parker <Ron_Parker@affirmednetworks.com>, Dave Dolson <ddolson@sandvine.com>
Subject: Re: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-length-overload-00.txt
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My personal take is that 2 bits for context identification simply will 
not cut it.  We already have 3 (or is it four) context definitions.  And 
while they each name a usage, I do not think that the DC allocation or 
the mobile allocation cover all the arrangements people who are trying 
to use MD-1 will find they need.

Which is why I prefer to leave this to the control plane, as we have 
agreed.  And also why I prefer to have the various allocation drafts as 
informational.

It may be that for control plane purposes we will need an extensible 
registry of allocations.  Or maybe we will not need it.  that can be 
worked out when control plane behaviors are worked out.  (And those may 
be spread across more than one protocol, since "control" for our 
purposes may include traditional control, orchestration, or management 
components.)

Yours,
Joel

On 10/24/16 10:36 PM, wang.cui1@zte.com.cn wrote:
> Dear all,
>
> In fact, there is also another solution to address this problem
> proposed in a previous draft
> https://tools.ietf.org/html/draft-wang-sfc-md-type-issues-02. It also
> proposed to add some bits in NSH, such as reserving 2 bits in the
> MD-Type field, to identify the exact meaning of the Mandatory Context
> Headers. This solution don't bother the length field as well as the
> MD-type=1/2. But is requires the original MD Type field to make 2
> bits room for this purpose.
>
> On the other hand, I do agree that, both
> draft-wang-sfc-md-type-issues-02 and
> draft-vandevelds-sfc-nsh-overload try to propose the issue, we may
> agree/disagree on the different approaches, but there should find a
> agreeable solution for how to understand the exact meaning in the
> Mandatory Context Headers fields in mixed scenarios.
>
> BRs, Linda Wang
>
> "sfc" <sfc-bounces@ietf.org> Ð´ÓÚ 2016/10/18 10:10:35:
>
>> "Joel M. Halpern" <jmh@joelhalpern.com> ·¢¼þÈË:  "sfc"
>> <sfc-bounces@ietf.org>
>>
>> 2016/10/18 10:10
>>
>> ÊÕ¼þÈË
>>
>> Dave Dolson <ddolson@sandvine.com>, Ron Parker
>> <Ron_Parker@affirmednetworks.com>, "Van De Velde, Gunter (Nokia -
>> BE)" <gunter.van_de_velde@nokia.com>, "sfc@ietf.org"
>> <sfc@ietf.org>,
>>
>> ³­ËÍ
>>
>> Ö÷Ìâ
>>
>> Re: [sfc] New Version Notification for draft-vandevelde-sfc-nsh-
>> length-overload-00.txt
>>
>> I agree with Dave.  The length field should always mean length. One
>> of the strong benefits of this is that if there is a need (for
>> logging, analysis, ...) to get to the data packet but not to
>> understand the metadata, the length field always just works.  This
>> significantly simplifies many code paths.
>>
>> Yours, Joel
>>
>> On 10/17/16 12:10 PM, Dave Dolson wrote:
>>>
>>> I would prefer to see the length field always mean length, so
>>> that
>> implementations not requiring metadata can just skip the metadata
>> regardless of MD type.
>>>
>>> At the risk of stating the obvious, there already is an MD type
>> field that can be used to discriminate metadata allocations.
>> Values 3,4,5,... are available for different MD encodings.
>>>
>>> -Dave
>>>
>>> ________________________________________ From: sfc
>>> [sfc-bounces@ietf.org] on behalf of Ron Parker
>> [Ron_Parker@affirmednetworks.com]
>>> Sent: Monday, October 17, 2016 10:50 AM To: Van De Velde, Gunter
>>> (Nokia - BE); sfc@ietf.org Subject: Re: [sfc] New Version
>>> Notification for draft-vandevelde-
>> sfc-nsh-length-overload-00.txt
>>>
>>> Gunter,
>>>
>>> I strongly support this proposal.   It brings more specificity
>>> to
>> Type 1 which will undoubtedly improve interworking between
>> different implementations and between different administrative
>> domains.
>>>
>>> Ron
>>>
>>>
>>> -----Original Message----- From: sfc
>>> [mailto:sfc-bounces@ietf.org] On Behalf Of Van De Velde,
>> Gunter (Nokia - BE)
>>> Sent: Monday, October 17, 2016 5:15 AM To: sfc@ietf.org Subject:
>>> [GRAYMAIL] [sfc] FW: New Version Notification for draft-
>> vandevelde-sfc-nsh-length-overload-00.txt
>>>
>>> Short text about overloading NSH length field for NSH MD Type-1
>>> as
>> context allocation type, including proposal for backward
>> compatibility.
>>>
>>> G/
>>>
>>> ------
>>>
>>> On 17/10/2016, 10:05, "internet-drafts@ietf.org" <internet-
>> drafts@ietf.org> wrote:
>>>
>>>
>>> A new version of I-D,
> draft-vandevelde-sfc-nsh-length-overload-00.txt
>>> has been successfully submitted by Gunter Van de Velde and
> posted to the
>>> IETF repository.
>>>
>>> Name:               draft-vandevelde-sfc-nsh-length-overload
>>> Revision:   00 Title:              Network Services Header
>>> Context
> AllocationIdentifier
>>> Document date:      2016-10-17 Group:              Individual
>>> Submission Pages:              5 URL:
>>> https://www.ietf.org/internet-drafts/draft-
>> vandevelde-sfc-nsh-length-overload-00.txt
>>> Status:         https://datatracker.ietf.org/doc/draft-
>> vandevelde-sfc-nsh-length-overload/
>>> Htmlized:       https://tools.ietf.org/html/draft-vandevelde-
>> sfc-nsh-length-overload-00
>>>
>>>
>>> Abstract: The specification of the NSH MD Type 1 header
> [draft-ietf-sfc-nsh]
>>> mandates four Context Headers, 4-byte each, and they MUST be
> added
>>> immediately following the Service Path Header.  As direct
>>> consequence, an NSH MD Type 1 header is always Length 0x6
> (six 4-byte
>>> words).  As a result, the Length field of the NSH MD Type 1
> header
>>> provides an information which is known by simply looking at
> the "MD
>>> Type" field.  However, while [draft-ietf-sfc-nsh] does not
> specify
>>> the encoding of these Context Headers, other specifications have
>>> started to do so.  A need to distinguish types of Context
>>> Headers therefore arises.
>>>
>>> This draft proposes to overload the Length field of an NSH MD
> Type 1
>>> as Meta-Data context allocation identifier and to create a IANA
>>> repository for NSH MD Type 1 allocation schemes.  The NSH MD
> Type 1
>>> Length field overload intends to allow universal
> understanding at any
>>> network location and by any network device of the context
> allocation
>>> structure.
>>>
>>>
>>>
>>>
>>>
>>> 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
>>>
>>>
>>>
>>> _______________________________________________ sfc mailing list
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From: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
Thread-Topic: [sfc] metadata type 1 constraint
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Date: Wed, 26 Oct 2016 09:24:24 +0000
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Cc: "Paul Quinn \(paulq\)" <paulq@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>, Lucy yong <lucy.yong@huawei.com>
Subject: Re: [sfc] metadata type 1 constraint
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To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, "Carlos Pignataro (cpignata)" <cpignata@cisco.com>, "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
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Cc: "Paul Quinn \(paulq\)" <paulq@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>, Lucy yong <lucy.yong@huawei.com>
Subject: Re: [sfc] metadata type 1 constraint
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From: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
Thread-Topic: [sfc] metadata type 1 constraint
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Cc: "Paul Quinn \(paulq\)" <paulq@cisco.com>, Lucy yong <lucy.yong@huawei.com>, "sfc@ietf.org" <sfc@ietf.org>
Subject: Re: [sfc] metadata type 1 constraint
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From: "Jim Guichard (jguichar)" <jguichar@cisco.com>
To: "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>
Thread-Topic: [sfc] metadata type 1 constraint
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Date: Wed, 26 Oct 2016 11:41:52 +0000
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References: <2691CE0099834E4A9C5044EEC662BB9D572E17C7@dfweml501-mbb> <16dbb343-f630-9e02-2e30-71b9417a620b@joelhalpern.com> <2691CE0099834E4A9C5044EEC662BB9D572E19A9@dfweml501-mbb> <c2ecc85b-b972-07ab-2127-38152ccdf8e9@joelhalpern.com> <2691CE0099834E4A9C5044EEC662BB9D572E1FB3@dfweml501-mbb> <CDF2F015F4429F458815ED2A6C2B6B0B838F8DC8@MBX021-W3-CA-2.exch021.domain.local> <2691CE0099834E4A9C5044EEC662BB9D572E20CE@dfweml501-mbb> <26723B93-0511-46DA-8EC5-581E9AF88EB7@alcatel-lucent.com> <b9b7ab83-7656-68a0-7b1e-b7904529f572@joelhalpern.com> <72836835-1674-4A1F-9AD3-AB084436BE68@cisco.com> <F050A823-C902-493D-A660-C77003BBA610@alcatel-lucent.com> <3C278B10-6EAB-4007-83E3-1EBDBD104664@alcatel-lucent.com> <0btu0gjrd9wd4r1sgre215ff.1477053881498@email.android.com> <2691CE0099834E4A9C5044EEC662BB9D572E368A@dfweml501-mbb> <1D51A977-95C6-49D7-BE36-365DD95BDE51@cisco.com> <2691CE0099834E4A9C5044EEC662BB9D572E4FDA@dfweml501-mbb> <6C0BA72D-A102-4592-BEDB-2905DA8B49CB@alcatel-lucent.com> <6F0E435A-47EA-435F-AC3D-7262FEC4FEF3@cisco.com> <51EEC4A1-178A-4C70-B85C-07210D875D7D@cisco.com>, <787AE7BB302AE849A7480A190F8B933009D980B7@OPEXCLILMA3.corporate.adroot.infra.ftgroup>
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Cc: "Carlos Pignataro \(cpignata\)" <cpignata@cisco.com>, "Paul Quinn \(paulq\)" <paulq@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>, Lucy yong <lucy.yong@huawei.com>, "Van De Velde, Gunter \(Nokia - BE\)" <gunter.van_de_velde@nokia.com>
Subject: Re: [sfc] metadata type 1 constraint
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Hi Med,

Yes, you are correct that there are a few open tickets (from the WGLC) that=
 need to be closed before the chairs forward the document to the IESG. Howe=
ver, this particular topic is not one of them and unless a consensus is rea=
ched by the WG on any new proposal, no changes will be made.

Jim

Sent from my iPhone

On Oct 26, 2016, at 5:30 AM, "mohamed.boucadair@orange.com<mailto:mohamed.b=
oucadair@orange.com>" <mohamed.boucadair@orange.com<mailto:mohamed.boucadai=
r@orange.com>> wrote:

Hi Jim,

Unless I=92 mistaken, there are pending issues that are not addressed as pa=
rt of the last WGLC.

Cheers,
Med

De : sfc [mailto:sfc-bounces@ietf.org] De la part de Jim Guichard (jguichar=
)
Envoy=E9 : mardi 25 octobre 2016 22:38
=C0 : Carlos Pignataro (cpignata); Van De Velde, Gunter (Nokia - BE)
Cc : Paul Quinn (paulq); Lucy yong; sfc@ietf.org<mailto:sfc@ietf.org>
Objet : Re: [sfc] metadata type 1 constraint

Dear SFC WG:

[Chair hat on] ..

While this discussion has been interesting, a protracted debate on a proble=
m for which a workable control plane solution exists is unfortunate.

As a WG we need to make progress with the SFC encapsulation. I would make t=
he following observations:

  *   The NSH document has already completed WG LC and is waiting for chair=
 approval to submit to IESG for publication.
  *   There is no way to call consensus for a specific change as there are =
so many alternatives on the table.
I would like to give this discussion the rest of the week to reach a single=
 proposal that has enough WG agreement so that the chairs may reasonably as=
k for WG consensus or disagreement. In the absence of WG agreement to a cha=
nge then we will proceed with the known workable solution and forward the N=
SH document to the IESG for publication.

Thanks!

Jim

From: sfc <sfc-bounces@ietf.org<mailto:sfc-bounces@ietf.org>> on behalf of =
"Carlos Pignataro (cpignata)" <cpignata@cisco.com<mailto:cpignata@cisco.com=
>>
Date: Tuesday, October 25, 2016 at 10:37 AM
To: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com<mail=
to:gunter.van_de_velde@nokia.com>>
Cc: Paul Quinn <paulq@cisco.com<mailto:paulq@cisco.com>>, "sfc@ietf.org<mai=
lto:sfc@ietf.org>" <sfc@ietf.org<mailto:sfc@ietf.org>>, Lucy yong <lucy.yon=
g@huawei.com<mailto:lucy.yong@huawei.com>>
Subject: Re: [sfc] metadata type 1 constraint

Gunter,

There's clearly a trade off and a set of pros and cons for having a header =
being self-describing versus non-self-describing. Similarly, there's a bala=
nce in where we place state.

However, you are making some bold statements below, and I'd like to underst=
and some more. I'm not pushing a position, I just seem to be missing someth=
ing from your argument.

Saying that a non-self-describing packet / non stateless SF hurts interoper=
ability to the point of uselessness, is attaching that description to MPLS =
Labels or L2TPv3 encapsulation. Those don't have explicit indications.

You are advocating for an indication of allocation type in the packet. That=
's not unreasonable in itself, it is a sensible question.

But that is not "stateless" as you call it, because the SF still holds stat=
e indexed by SPI, and in any case would need to hold state on what each all=
ocation type means, which implicitly happens without an allocation type. Bo=
th need state, both need a control plane to work.

In other words, it seems to me that both (with or without an allocation typ=
e) have the *exact* same interoperability requirements and characteristics.=
 The details are different of course, but below seems like FUD.

So, without pushing for any particular method, I'd really would like to und=
erstand your technical rational in more details.

You say "marginally useable when interoperability", "dubious usefulness and=
 adds significant operational complexity", and "a formally standardized all=
ocation scheme". The latter should exist in both cases (whether you put it =
in the packet or not). And while I understand your preference of an explici=
t allocation type, I still do not understand why.

How exactly the current approach with interoperable running code hurts inte=
roperability?

Thumb typed by Carlos Pignataro.
Excuze typofraphicak errows

On Oct 25, 2016, at 00:55, Van De Velde, Gunter (Nokia - BE) <gunter.van_de=
_velde@nokia.com<mailto:gunter.van_de_velde@nokia.com>> wrote:
I agree with Lucy and Dave regarding the futile usefulness of MD#1.

The value of a fixed and predictable MD size is clear, however the lack of =
signalling to indicate in stateless manner the used NSH MD#1 allocation sch=
eme makes this type of NSH header only marginally useable when interoperabi=
lity of Service function behaviour is required or when a single SF needs to=
 service packets of different NSH MD#1 allocation scheme=92s.

The text proposed for adding to MD#1 is not fixing this, however it is maki=
ng it more clear to the user that MD#1 is from interoperability perspective=
 rather dubious and adds significant operational complexity.

If the intent is to make MD#1 more valuable and if we desire to bank upon t=
he benefits of a fixed size 16 octets context field, then maybe a compromis=
e needs to be made, and some effort be explored to add into the NSH MD#1 a =
context allocation scheme indication? Or, we create MD#3, MD#4, etc each ha=
ving a fixed 16-octet size and a formally documented and standardized alloc=
ation scheme.

G/

From: sfc <sfc-bounces@ietf.org<mailto:sfc-bounces@ietf.org>> on behalf of =
Lucy yong <lucy.yong@huawei.com<mailto:lucy.yong@huawei.com>>
Date: Tuesday, 25 October 2016 at 03:04
To: "Paul Quinn (paulq)" <paulq@cisco.com<mailto:paulq@cisco.com>>
Cc: "sfc@ietf.org<mailto:sfc@ietf.org>" <sfc@ietf.org<mailto:sfc@ietf.org>>
Subject: Re: [sfc] metadata type 1 constraint

Paul,

If NSH has to support MD-1 with 16-bytes datablock,  please consider adding=
 the additional text we proposed, which addresses interworking concern.

I think that for the MD-2, it also needs to add some rules about when a SFC=
-aware SF is configured to use metadata and receives MD-2, if it does not u=
nderstand the MD class and/or type, it MUST NOT process the packet, et al.

Lucy




From: Paul Quinn (paulq) [mailto:paulq@cisco.com]
Sent: Monday, October 24, 2016 4:23 PM
To: Lucy yong
Cc: sfc@ietf.org<mailto:sfc@ietf.org>
Subject: Re: [sfc] metadata type 1 constraint

Hi Lucy,

The value of a fixed size header as a MUST is significant from many perspec=
tives, including but not limited to:

Implementations, including software implementations, benefit form the predi=
ctability of a fixed size header. One only needs to look at the lack of wid=
ely deployed variable length data plane protocols to see this in practice.

>From an operational perspective, having a bounded (small) number of metadat=
a to work with helps to bound the policy expression, which after all is the=
 main use of the metadata.

There are existing implementations that demonstrate the applicability of MD=
 Type 1 to a wide-range of use cases, and those implementation reap the ben=
efits of the two aforementioned points.

Paul

On Oct 21, 2016, at 6:48 PM, Lucy yong <lucy.yong@huawei.com<mailto:lucy.yo=
ng@huawei.com>> wrote:

If we intend to standardize metadata structure per an SFC application, I wo=
nder why NSH needs MD#1? MD#2 can support all SFC needs. MD#2 even support =
expert review metadata class, experimental metadata class as well. Should c=
onsider removing MD#1?

Lucy

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Vigoureux, Martin (Nok=
ia - FR)
Sent: Friday, October 21, 2016 7:56 AM
To: Van De Velde, Gunter (Nokia - BE); Paul Quinn (paulq); Joel M. Halpern
Cc: sfc@ietf.org<mailto:sfc@ietf.org>
Subject: Re: [sfc] metadata type 1 constraint

>From the latest discussion I wonder if the allocation drafts shouldn't in f=
act define their own MD type (3, 4, ...).

If there is a need/use for that, a TLV for framing these MDs in MD2 could b=
e defined, as sfc-nsh-tlv now does.

I'd in any case prefer to avoid duplicating specifications across documents=
, and as such sfc-nsh-tlv should only reference the encodings, not replicat=
e them.

-m


-------- Message d'origine --------
De : "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com<mai=
lto:gunter.van_de_velde@nokia.com>>
Date :21/10/2016 14:36 (GMT+01:00)
=C0 : "Paul Quinn (paulq)" <paulq@cisco.com<mailto:paulq@cisco.com>>, "Joel=
 M. Halpern" <jmh@joelhalpern.com<mailto:jmh@joelhalpern.com>>
Cc : sfc@ietf.org<mailto:sfc@ietf.org>
Objet : Re: [sfc] metadata type 1 constraint
The good news is that draft draft-quinn-sfc-nsh-tlv-02.txt now has a fix su=
ggesting context allocation scheme encoding:

https://tools.ietf.org/rfcdiff?
  url1=3Dhttps://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-01.txt
  &url2=3Dhttps://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-02.txt

However, if the intent is that MD#1 is Opaque, then why even try to suggest=
 encodings for it? Opaque info is opaque info=85 either you define it, or y=
ou do not define it=85 anything else is confusing and contradicting from op=
erational and implementation perspective.

I would prefer to see that both =93Data Center Allocation=94 and =93Mobilit=
y/Broadband Allocation=94 drafts are written with intended main usage in a =
MD#2, instead of MD#1 as then it is a complete and interoperable allocation=
 scheme usage with significantly reduced operational overhead and restricti=
ons. Assuming the length of these allocation blobs fixed at 16 octets for p=
otentially stuffing them in a MD#1 sounds fine.

G/



On 19/10/2016, 17:22, "sfc on behalf of Van De Velde, Gunter (Nokia - BE)" =
<sfc-bounces@ietf.org on behalf of gunter.van_de_velde@nokia.com<mailto:sfc=
-bounces@ietf.org%20on%20behalf%20of%20gunter.van_de_velde@nokia.com>> wrot=
e:

    It is sad that we significantly increase the operational burden for all=
ocation scheme signalling for MD#1. I am dazzled the WG believes stateful s=
ignalling is easier for deployment compared with a stateless solution for M=
D#1. The imposed operational complexity is significant with current proposa=
l.

    G/




    On 19/10/2016, 15:33, "sfc on behalf of Paul Quinn (paulq)" <sfc-bounce=
s@ietf.org on behalf of paulq@cisco.com<mailto:sfc-bounces@ietf.org%20on%20=
behalf%20of%20paulq@cisco.com>> wrote:

        Joel,

        I agree with you: the current approach is simple and workable.  The=
 allocation scheme are simply information examples.

        Paul

        > On Oct 18, 2016, at 8:14 PM, Joel M. Halpern <jmh@joelhalpern.com=
<mailto:jmh@joelhalpern.com>> wrote:
        >
        > Our current approach is to allow definition of allocation schemes=
, but not to mandate any specific allocation scheme for MD-1.
        > That seems to me to be a good approach, workable, and what we hav=
e agreed and documented.
        >
        > Yours,
        > Joel
        >
        > On 10/18/16 12:09 PM, Van De Velde, Gunter (Nokia - BE) wrote:
        >> If NSH MD Type-1 defines for the metadata to be Opaque, then we =
should not make an effort to define it, and just tread it as Opaque content=
 imo and live with the consequences=85and in that case use MD Type-2 for th=
ese types of well known metadata transport mechanisms.
        >>
        >> If however, we decide to define the allocation schemes, then we =
should also architect an indicator for the used allocation scheme.
        >> At this point in time, there models were suggested (overload Len=
gth, overload MD type, use few bits of MD context data).
        >> I strongly believe there is value in having the metadata allocat=
ion structure signalled within the NSH itself, even for MD Type-1.
        >> (It avoids control plane signalling and creates state which need=
s to be maintained, and that sounds as a very expensive operation).
        >>
        >> Alternate is to just say as Lucy suggests, and restrict MD Type-=
1 Service Chain SF=92s per allocation scheme. This is a solution that works=
, albeit it is a very impacting restriction for flexibility and resource sh=
aring).
        >>
        >> G/
        >>
        >>
        >> On 18/10/2016, 16:49, "sfc on behalf of Lucy yong" <sfc-bounces@=
ietf.org on behalf of lucy.yong@huawei.com<mailto:sfc-bounces@ietf.org%20on=
%20behalf%20of%20lucy.yong@huawei.com>> wrote:
        >>
        >>    Comment on "Allocating a nibble or byte within the 32 bytes (=
probably the first nibble or byte) is yet another."
        >>
        >>    Lucy: Technically We can do this on MD#1, but NSH already def=
ines MD#2. Is the variable length the only feature that hardware can't deal=
 with?
        >>
        >>    Lucy
        >>
        >>    -----Original Message-----
        >>    From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
        >>    Sent: Tuesday, October 18, 2016 10:05 AM
        >>    To: Lucy yong; Joel M. Halpern; sfc@ietf.org<mailto:sfc@ietf.=
org>
        >>    Subject: RE: [sfc] metadata type 1 constraint
        >>
        >>    Even though the interpretation of metadata is dependent on co=
ntrol plane interaction, where I think the original proposal has value is t=
hat there might be multiple separate interpretations simultaneously within =
the same administrative domain.   A way to describe, on the wire, which of =
those interpretations is in force for that particular SFP seems valuable to=
 me.   You could definitely argue that the control plane could install the =
interpretation locally on a per SFP basis;  also being explicit on the wire=
 will likely enhance interoperability and debuggability.
        >>
        >>    The value would be locally significant within the administrat=
ive domain (i.e., metadata schema 1, metatadata schema 2, etc.).   Overload=
ing length is one way.   Overloading MD-type is another.   Allocating a nib=
ble or byte within the 32 bytes (probably the first nibble or byte) is yet =
another.
        >>
        >>       Ron
        >>
        >>
        >>    -----Original Message-----
        >>    From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Lucy yon=
g
        >>    Sent: Tuesday, October 18, 2016 10:27 AM
        >>    To: Joel M. Halpern <jmh@joelhalpern.com<mailto:jmh@joelhalpe=
rn.com>>; sfc@ietf.org<mailto:sfc@ietf.org>
        >>    Subject: Re: [sfc] metadata type 1 constraint
        >>
        >>    Joel,
        >>
        >>    Lucy, while your two text proposals are not wrong, I do not s=
ee them as adding any clarity to the document.  The sections are very short=
 and clearly define only the syntax.
        >>    [Lucy] True. However, for this document, readers expect Secti=
on 3 to describe NSH syntax and semantics. Section 3.1-3.3 do both. If sect=
ion 3.4 and 3.5 just specify the syntax, from documenting perspective, it i=
s important to explicitly state the two text out.
        >>
        >>    With regard to SF and MD-1 support, there is absolutely nothi=
ng that requires an SF to support only one MD-1 structure.  Rather, the con=
trol mechanisms will tell the SF how to extract the data it needs from the =
MD-1 header.
        >>    [Lucy] This puts much uncertainty for a single SF on what to =
implement, which causes people's concern. IMO, if we don't have a way to ad=
dress this challenge here (you stated in interim meeting), pushing it to an=
other place does not solve/address it. For example,  will the control mecha=
nisms tell an SF how to extract the data it needs from the MD-1 header per =
a SFP, or per a SFC, or for all SFC packets, or per payload flow, or combin=
ation of them? This will significantly impact SF implementation. The reason=
 having MD type 1 is that is hardware friendly. Leaving these uncertainty o=
pen, not sure if the reason still makes a sense.
        >>
        >>    Lucy
        >>    I believe there is already text in the control plane requirem=
ents document that describes the need for this control functionality.
        >>
        >>
        >>
        >>    Yours,
        >>    Joel
        >>
        >>    On 10/17/16 11:07 AM, Lucy yong wrote:
        >>    > Suggestions:
        >>    >
        >>    > Section 3.4 should mention that this section only defines M=
D type 1
        >>    > format. The semantics of MD Type 1 is outside the scope of =
this
        >>    > document. Thus, the use of MD type 1 is outside the scope o=
f this
        >>    > document.
        >>    >
        >>    > Section 3.5 should mention that this section only defines M=
EF type 2
        >>    > format. The semantics of MD type 2 is outside the scope of =
this
        >>    > document. Thus, the use of MD type 2 is outside the scope o=
f this
        >>    > documents.
        >>    >
        >>    > IMO: these statements are important for the sections.
        >>    >
        >>    > Joel, MD semantics is critical for SFs. More than one seman=
tics of MD
        >>    > type 1 MUST NOT be specified for a SF. This should be a req=
uirement in
        >>    > the SFC arch. as a result of NSH design's, but the architec=
ture is
        >>    > already published. Maybe control plane requirement is the p=
lace to
        >>    > state this out as the result of SFC arch and NSH design.
        >>    >
        >>    > Thanks, Lucy
        >>    >
        >>    > -----Original Message----- From: sfc [mailto:sfc-bounces@ie=
tf.org] On
        >>    > Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:=
39 PM To:
        >>    > Lucy yong; sfc@ietf.org<mailto:sfc@ietf.org> Subject: Re: [=
sfc] metadata type 1 constraint
        >>    >
        >>    > A) I woud not want to state any such constraint in the NSH =
document,
        >>    > because B) In fact, the SFP ID is in every NSH header.  So =
yes, there
        >>    > is context if it is needed
        >>    >
        >>    > It is true that MD-2 is more flexible than MD-1.  I don't t=
hink anyone
        >>    > disagrees with that.
        >>    >
        >>    > Yours, Joel
        >>    >
        >>    > On 10/16/16 3:25 PM, Lucy yong wrote:
        >>    >> RFC7665 (SFC architecture) states  "This architecture allo=
ws an SF to
        >>    >> be part of multiple SFPs and SFCs."
        >>    >>
        >>    >>
        >>    >>
        >>    >> NSH just specifies MD type1 with a 16 bytes field, and  NS=
H doc.
        >>    >> states
        >>    >>
        >>    >> 3.  NSH provides a mechanism to carry shared metadata betw=
een
        >>    >>
        >>    >> participating entities and service functions.  The semanti=
cs of
        >>    >>
        >>    >> the shared metadata is communicated via a control plane, w=
hich is
        >>    >>
        >>    >> outside the scope of this document, to participating nodes=
.
        >>    >>
        >>    >>
        >>    >>
        >>    >> Comments: this mean: when an SF that is part of multiple S=
FCs and MD
        >>    >> type 1 is used in some of SFCs, these SFCs MUST have the s=
ame
        >>    >> metadata semantics.  This is because that NSH does not con=
vey SFC
        >>    >> identifier. For MD type 2, different SFCs may insert diffe=
rent list
        >>    >> of TLVs and each TLV has a type and specified semantics al=
ong (the
        >>    >> TLVs will be specified in different doc.).
        >>    >>
        >>    >>
        >>    >>
        >>    >> Should we state out this constraint in NSH doc.
        >>    >>
        >>    >>
        >>    >>
        >>    >> Lucy
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >> _______________________________________________ sfc mailin=
g list
        >>    >> sfc@ietf.org<mailto:sfc@ietf.org> https://www.ietf.org/mai=
lman/listinfo/sfc
        >>    >>
        >>    >
        >>    > _______________________________________________ sfc mailing=
 list
        >>    > sfc@ietf.org<mailto:sfc@ietf.org> https://www.ietf.org/mail=
man/listinfo/sfc
        >>    >
        >>
        >>    _______________________________________________
        >>    sfc mailing list
        >>    sfc@ietf.org<mailto:sfc@ietf.org>
        >>    https://www.ietf.org/mailman/listinfo/sfc
        >>
        >>    _______________________________________________
        >>    sfc mailing list
        >>    sfc@ietf.org<mailto:sfc@ietf.org>
        >>    https://www.ietf.org/mailman/listinfo/sfc
        >>
        >>
        >
        > _______________________________________________
        > sfc mailing list
        > sfc@ietf.org<mailto:sfc@ietf.org>
        > https://www.ietf.org/mailman/listinfo/sfc

        _______________________________________________
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<div>
<div style=3D"direction: inherit;">Hi Med,</div>
<div style=3D"direction: inherit;"><br>
</div>
<div style=3D"direction: inherit;">Yes, you are correct that there are a fe=
w open tickets (from the WGLC) that need to be closed before the chairs for=
ward the document to the IESG. However, this particular topic is not one of=
 them and unless a consensus is reached
 by the WG on any new proposal, no changes will be made.</div>
<div style=3D"direction: inherit;"><br>
</div>
<div style=3D"direction: inherit;">Jim</div>
<br>
Sent from my iPhone</div>
<div><br>
On Oct 26, 2016, at 5:30 AM, &quot;<a href=3D"mailto:mohamed.boucadair@oran=
ge.com">mohamed.boucadair@orange.com</a>&quot; &lt;<a href=3D"mailto:mohame=
d.boucadair@orange.com">mohamed.boucadair@orange.com</a>&gt; wrote:<br>
<br>
</div>
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">Hi Jim,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:black">Unless I=92 mistaken, there are=
 pending issues that are not addressed as part of the last WGLC.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:black">Cheers,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:black">Med<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-=
family:&quot;Courier New&quot;;color:black"><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 style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">De&nbsp;:</span></b><span style=3D"fo=
nt-size: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>De la part de</b> Jim Guichard (jguichar)<br>
<b>Envoy=E9&nbsp;:</b> mardi 25 octobre 2016 22:38<br>
<b>=C0&nbsp;:</b> Carlos Pignataro (cpignata); Van De Velde, Gunter (Nokia =
- BE)<br>
<b>Cc&nbsp;:</b> Paul Quinn (paulq); Lucy yong; <a href=3D"mailto:sfc@ietf.=
org">sfc@ietf.org</a><br>
<b>Objet&nbsp;:</b> Re: [sfc] metadata type 1 constraint<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:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">Dear SFC WG:<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"><o:p>&nbsp;</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">[Chair hat on] ..<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"><o:p>&nbsp;</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">While this discussion has b=
een interesting, a protracted debate on a problem for which a workable cont=
rol plane solution exists is unfortunate.&nbsp;<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"><o:p>&nbsp;</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">As a WG we need to make pro=
gress with the SFC encapsulation. I would make the following observations:<=
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 style=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-=
serif&quot;">The NSH document has already completed WG LC and is waiting fo=
r chair approval to submit to IESG for publication.<o:p></o:p></span></li><=
li class=3D"MsoNormal" style=3D"color:black;mso-margin-top-alt:auto;mso-mar=
gin-bottom-alt:auto;mso-list:l0 level1 lfo1">
<span style=3D"font-size:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-=
serif&quot;">There is no way to call consensus for a specific change as the=
re are so many alternatives on the table.<o:p></o:p></span></li></ul>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">I would like to give this d=
iscussion the rest of the week to reach a single proposal that has enough W=
G agreement so that the chairs may reasonably ask for WG
 consensus or disagreement. In the absence of WG agreement to a change then=
 we will proceed with the known workable solution and forward the NSH docum=
ent to the IESG for publication.<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"><o:p>&nbsp;</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">Thanks!<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"><o:p>&nbsp;</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">Jim<o:p></o:p></span></p>
</div>
</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"><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 style=3D"font-family:&quot;Calibri&quot;,&q=
uot;sans-serif&quot;;color:black">From:
</span></b><span style=3D"font-family:&quot;Calibri&quot;,&quot;sans-serif&=
quot;;color:black">sfc &lt;<a href=3D"mailto:sfc-bounces@ietf.org">sfc-boun=
ces@ietf.org</a>&gt; on behalf of &quot;Carlos Pignataro (cpignata)&quot; &=
lt;<a href=3D"mailto:cpignata@cisco.com">cpignata@cisco.com</a>&gt;<br>
<b>Date: </b>Tuesday, October 25, 2016 at 10:37 AM<br>
<b>To: </b>&quot;Van De Velde, Gunter (Nokia - BE)&quot; &lt;<a href=3D"mai=
lto:gunter.van_de_velde@nokia.com">gunter.van_de_velde@nokia.com</a>&gt;<br=
>
<b>Cc: </b>Paul Quinn &lt;<a href=3D"mailto:paulq@cisco.com">paulq@cisco.co=
m</a>&gt;, &quot;<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a>&quot; &lt=
;<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a>&gt;, Lucy yong &lt;<a hre=
f=3D"mailto:lucy.yong@huawei.com">lucy.yong@huawei.com</a>&gt;<br>
<b>Subject: </b>Re: [sfc] metadata type 1 constraint<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"><o:p>&nbsp;</o:p></span></p=
>
</div>
<div>
<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">Gunter,<o:p></o:p></span></=
p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p=
>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">There's clearly a trade off=
 and a set of pros and cons for having a header being self-describing versu=
s non-self-describing. Similarly, there's a balance in where
 we place state.&nbsp;<o:p></o:p></span></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p=
>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">However, you are making som=
e bold statements below, and I'd like to understand some more. I'm not push=
ing a position, I just seem to be missing something from
 your argument.&nbsp;<o:p></o:p></span></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p=
>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">Saying that a non-self-desc=
ribing packet / non stateless SF hurts interoperability to the point of use=
lessness, is attaching that description to MPLS Labels or
 L2TPv3 encapsulation. Those don't have explicit indications.&nbsp;<o:p></o=
:p></span></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p=
>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">You are advocating for an i=
ndication of allocation type in the packet. That's not unreasonable in itse=
lf, it is a sensible question.<o:p></o:p></span></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p=
>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">But that is not &quot;state=
less&quot; as you call it, because the SF still holds state indexed by SPI,=
 and in any case would need to hold state on what each allocation
 type means, which implicitly happens without an allocation type. Both need=
 state, both need a control plane to work.&nbsp;<o:p></o:p></span></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p=
>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">In other words, it seems to=
 me that both (with or without an allocation type) have the *exact* same in=
teroperability requirements and characteristics. The details
 are different of course, but below seems like FUD.&nbsp;<o:p></o:p></span>=
</p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p=
>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">So, without pushing for any=
 particular method, I'd really would like to understand your technical rati=
onal in more details.&nbsp;<o:p></o:p></span></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p=
>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">You say &quot;marginally us=
eable when interoperability&quot;, &quot;dubious usefulness and adds signif=
icant operational complexity&quot;, and &quot;a formally standardized alloc=
ation
 scheme&quot;. The latter should exist in both cases (whether you put it in=
 the packet or not). And while I understand your preference of an explicit =
allocation type, I still do not understand why.&nbsp;<o:p></o:p></span></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black"><o:p>&nbsp;</o:p></span></p=
>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black">How exactly the current app=
roach with interoperable running code hurts interoperability?<br>
<br>
Thumb typed by Carlos Pignataro. <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">Excuze typofraphicak errows=
<o:p></o:p></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"font-s=
ize:10.5pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:bla=
ck"><br>
On Oct 25, 2016, at 00:55, Van De Velde, Gunter (Nokia - BE) &lt;<a href=3D=
"mailto:gunter.van_de_velde@nokia.com">gunter.van_de_velde@nokia.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"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,&quot;sans-serif&quot;;color:black;mso-fareast-language:EN-US">=
I agree with Lucy and Dave regarding the futile usefulness of MD#1.</span><=
span style=3D"color:black"><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:black;mso-fareast-language:EN-US">=
&nbsp;</span><span style=3D"color:black"><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:black;mso-fareast-language:EN-US">=
The value of a fixed and predictable MD size is clear, however the lack of =
signalling to indicate in stateless manner the used NSH
 MD#1 allocation scheme makes this type of NSH header only marginally useab=
le when interoperability of Service function behaviour is required or when =
a single SF needs to service packets of different NSH MD#1 allocation schem=
e=92s.</span><span style=3D"color:black"><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:black;mso-fareast-language:EN-US">=
&nbsp;</span><span style=3D"color:black"><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:black;mso-fareast-language:EN-US">=
The text proposed for adding to MD#1 is not fixing this, however it is maki=
ng it more clear to the user that MD#1 is from interoperability
 perspective rather dubious and adds significant operational complexity. </=
span><span style=3D"color:black"><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:black;mso-fareast-language:EN-US">=
&nbsp;</span><span style=3D"color:black"><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:black;mso-fareast-language:EN-US">=
If the intent is to make MD#1 more valuable and if we desire to bank upon t=
he benefits of a fixed size 16 octets context field, then
 maybe a compromise needs to be made, and some effort be explored to add in=
to the NSH MD#1 a context allocation scheme indication? Or, we create MD#3,=
 MD#4, etc each having a fixed 16-octet size and a formally documented and =
standardized allocation scheme.</span><span style=3D"color:black"><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:black;mso-fareast-language:EN-US">=
&nbsp;</span><span style=3D"color:black"><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:black;mso-fareast-language:EN-US">=
G/</span><span style=3D"color:black"><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:black;mso-fareast-language:EN-US">=
&nbsp;</span><span style=3D"color:black"><o:p></o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-family:&quot;Calibri&quot;,&q=
uot;sans-serif&quot;;color:black">From:
</span></b><span style=3D"font-family:&quot;Calibri&quot;,&quot;sans-serif&=
quot;;color:black">sfc &lt;<a href=3D"mailto:sfc-bounces@ietf.org">sfc-boun=
ces@ietf.org</a>&gt; on behalf of Lucy yong &lt;<a href=3D"mailto:lucy.yong=
@huawei.com">lucy.yong@huawei.com</a>&gt;<br>
<b>Date: </b>Tuesday, 25 October 2016 at 03:04<br>
<b>To: </b>&quot;Paul Quinn (paulq)&quot; &lt;<a href=3D"mailto:paulq@cisco=
.com">paulq@cisco.com</a>&gt;<br>
<b>Cc: </b>&quot;<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a>&quot; &lt=
;<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a>&gt;<br>
<b>Subject: </b>Re: [sfc] metadata type 1 constraint</span><span style=3D"c=
olor:black"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
</div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Paul,</span></i><span =
style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span></i><span=
 style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">If NSH has to support =
MD-1 with 16-bytes datablock, &nbsp;please consider adding the additional t=
ext we proposed, which addresses interworking concern.</span></i><span styl=
e=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span></i><span=
 style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">I think that for the M=
D-2, it also needs to add some rules about when a SFC-aware SF is configure=
d to use metadata and receives MD-2, if it does not understand
 the MD class and/or type, it MUST NOT process the packet, et al.</span></i=
><span style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span></i><span=
 style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Lucy</span></i><span s=
tyle=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span></i><span=
 style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span></i><span=
 style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span></i><span=
 style=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span></i><span=
 style=3D"color:black"><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 style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;;color:black">From:</span></b><span sty=
le=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot=
;;color:black"> Paul Quinn (paulq) [<a href=3D"mailto:paulq@cisco.com">mail=
to:paulq@cisco.com</a>]
<br>
<b>Sent:</b> Monday, October 24, 2016 4:23 PM<br>
<b>To:</b> Lucy yong<br>
<b>Cc:</b> <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<b>Subject:</b> Re: [sfc] metadata type 1 constraint</span><span style=3D"c=
olor:black"><o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">Hi Lucy, <o:p></o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">The value of a fixed siz=
e header as a MUST is significant from many perspectives, including but not=
 limited to:<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">Implementations, includi=
ng software implementations, benefit form the predictability of a fixed siz=
e header. One only needs to look at the lack of widely deployed variable le=
ngth data plane protocols to see this
 in practice.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">From an operational pers=
pective, having a bounded (small) number of metadata to work with helps to =
bound the policy expression, which after all is the main use of the metadat=
a.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">There are existing imple=
mentations that demonstrate the applicability of MD Type 1 to a wide-range =
of use cases, and those implementation reap the benefits of the two aforeme=
ntioned points.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">Paul<o:p></o:p></span></=
p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">On Oct 21, 2016, at 6:48=
 PM, Lucy yong &lt;<a href=3D"mailto:lucy.yong@huawei.com">lucy.yong@huawei=
.com</a>&gt; wrote:<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
<div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">If we intend to standa=
rdize metadata structure per an SFC application, I wonder why NSH needs MD#=
1? MD#2 can support all SFC needs. MD#2 even support expert
 review metadata class, experimental metadata class as well. Should conside=
r removing MD#1?</span></i><span style=3D"color:black"><o:p></o:p></span></=
p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span></i><span=
 style=3D"color:black"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">Lucy</span></i><span s=
tyle=3D"color:black"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span></i><span=
 style=3D"color:black"><o:p></o:p></span></p>
</div>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<div>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;;color:black">From:</span></b><span cla=
ss=3D"apple-converted-space"><span style=3D"font-size:10.0pt;font-family:&q=
uot;Tahoma&quot;,&quot;sans-serif&quot;;color:black">&nbsp;</span></span><s=
pan style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-ser=
if&quot;;color:black">sfc
 [<a href=3D"mailto:sfc-bounces@ietf.org"><span style=3D"color:purple">mail=
to:sfc-bounces@ietf.org</span></a>]<span class=3D"apple-converted-space">&n=
bsp;</span><b>On Behalf Of<span class=3D"apple-converted-space">&nbsp;</spa=
n></b>Vigoureux, Martin (Nokia - FR)<br>
<b>Sent:</b><span class=3D"apple-converted-space">&nbsp;</span>Friday, Octo=
ber 21, 2016 7:56 AM<br>
<b>To:</b><span class=3D"apple-converted-space">&nbsp;</span>Van De Velde, =
Gunter (Nokia - BE); Paul Quinn (paulq); Joel M. Halpern<br>
<b>Cc:</b><span class=3D"apple-converted-space">&nbsp;</span><a href=3D"mai=
lto:sfc@ietf.org"><span style=3D"color:purple">sfc@ietf.org</span></a><br>
<b>Subject:</b><span class=3D"apple-converted-space">&nbsp;</span>Re: [sfc]=
 metadata type 1 constraint</span><span style=3D"color:black"><o:p></o:p></=
span></p>
</div>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:black">From the latest discussi=
on I wonder if the allocation drafts shouldn't in fact define their own MD =
type (3, 4, ...).<br>
<br>
If there is a need/use for that, a TLV for framing these MDs in MD2 could b=
e defined, as sfc-nsh-tlv now does.<br>
<br>
I'd in any case prefer to avoid duplicating specifications across documents=
, and as such sfc-nsh-tlv should only reference the encodings, not replicat=
e them.<br>
<br>
-m<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black"><br>
<br>
-------- Message d'origine --------<br>
De : &quot;Van De Velde, Gunter (Nokia - BE)&quot; &lt;<a href=3D"mailto:gu=
nter.van_de_velde@nokia.com"><span style=3D"color:purple">gunter.van_de_vel=
de@nokia.com</span></a>&gt;<span class=3D"apple-converted-space">&nbsp;</sp=
an><br>
Date :21/10/2016 14:36 (GMT&#43;01:00)<span class=3D"apple-converted-space"=
>&nbsp;</span><br>
=C0 : &quot;Paul Quinn (paulq)&quot; &lt;<a href=3D"mailto:paulq@cisco.com"=
><span style=3D"color:purple">paulq@cisco.com</span></a>&gt;, &quot;Joel M.=
 Halpern&quot; &lt;<a href=3D"mailto:jmh@joelhalpern.com"><span style=3D"co=
lor:purple">jmh@joelhalpern.com</span></a>&gt;<span class=3D"apple-converte=
d-space">&nbsp;</span><br>
Cc :<span class=3D"apple-converted-space">&nbsp;</span><a href=3D"mailto:sf=
c@ietf.org"><span style=3D"color:purple">sfc@ietf.org</span></a><span class=
=3D"apple-converted-space">&nbsp;</span><br>
Objet : Re: [sfc] metadata type 1 constraint<span class=3D"apple-converted-=
space">&nbsp;</span><o:p></o:p></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:black">The goo=
d news is that draft draft-quinn-sfc-nsh-tlv-02.txt now has a fix suggestin=
g context allocation scheme encoding:<br>
<br>
<a href=3D"https://tools.ietf.org/rfcdiff?"><span style=3D"color:purple">ht=
tps://tools.ietf.org/rfcdiff?</span></a><br>
&nbsp; url1=3D<a href=3D"https://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-=
01.txt"><span style=3D"color:purple">https://tools.ietf.org/id/draft-quinn-=
sfc-nsh-tlv-01.txt</span></a><br>
&nbsp; &amp;url2=3D<a href=3D"https://tools.ietf.org/id/draft-quinn-sfc-nsh=
-tlv-02.txt"><span style=3D"color:purple">https://tools.ietf.org/id/draft-q=
uinn-sfc-nsh-tlv-02.txt</span></a><br>
<br>
However, if the intent is that MD#1 is Opaque, then why even try to suggest=
 encodings for it? Opaque info is opaque info=85 either you define it, or y=
ou do not define it=85 anything else is confusing and contradicting from op=
erational and implementation perspective.<br>
<br>
I would prefer to see that both =93Data Center Allocation=94 and =93Mobilit=
y/Broadband Allocation=94 drafts are written with intended main usage in a =
MD#2, instead of MD#1 as then it is a complete and interoperable allocation=
 scheme usage with significantly reduced
 operational overhead and restrictions. Assuming the length of these alloca=
tion blobs fixed at 16 octets for potentially stuffing them in a MD#1 sound=
s fine.<span class=3D"apple-converted-space">&nbsp;</span><br>
<br>
G/<br>
<br>
<br>
<br>
On 19/10/2016, 17:22, &quot;sfc on behalf of Van De Velde, Gunter (Nokia - =
BE)&quot; &lt;<a href=3D"mailto:sfc-bounces@ietf.org%20on%20behalf%20of%20g=
unter.van_de_velde@nokia.com"><span style=3D"color:purple">sfc-bounces@ietf=
.org on behalf of gunter.van_de_velde@nokia.com</span></a>&gt;
 wrote:<br>
<br>
&nbsp;&nbsp;&nbsp; It is sad that we significantly increase the operational=
 burden for allocation scheme signalling for MD#1. I am dazzled the WG beli=
eves stateful signalling is easier for deployment compared with a stateless=
 solution for MD#1. The imposed operational complexity
 is significant with current proposal.<br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp; G/<br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span>=
<br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp; On 19/10/2016, 15:33, &quot;sfc on behalf of Paul Quinn =
(paulq)&quot; &lt;<a href=3D"mailto:sfc-bounces@ietf.org%20on%20behalf%20of=
%20paulq@cisco.com"><span style=3D"color:purple">sfc-bounces@ietf.org on be=
half of paulq@cisco.com</span></a>&gt; wrote:<br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Joel,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-sp=
ace">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I agree with you: the current ap=
proach is simple and workable.&nbsp; The allocation scheme are simply infor=
mation examples.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-sp=
ace">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Paul<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-sp=
ace">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; On Oct 18, 2016, at 8:14 PM=
, Joel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.com"><span style=3D=
"color:purple">jmh@joelhalpern.com</span></a>&gt; wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;<span class=3D"apple-convert=
ed-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Our current approach is to =
allow definition of allocation schemes, but not to mandate any specific all=
ocation scheme for MD-1.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; That seems to me to be a go=
od approach, workable, and what we have agreed and documented.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;<span class=3D"apple-convert=
ed-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Yours,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Joel<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;<span class=3D"apple-convert=
ed-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; On 10/18/16 12:09 PM, Van D=
e Velde, Gunter (Nokia - BE) wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; If NSH MD Type-1 define=
s for the metadata to be Opaque, then we should not make an effort to defin=
e it, and just tread it as Opaque content imo and live with the consequence=
s=85and in that case use MD Type-2 for these types of well known metadata t=
ransport
 mechanisms.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; If however, we decide t=
o define the allocation schemes, then we should also architect an indicator=
 for the used allocation scheme.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; At this point in time, =
there models were suggested (overload Length, overload MD type, use few bit=
s of MD context data).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; I strongly believe ther=
e is value in having the metadata allocation structure signalled within the=
 NSH itself, even for MD Type-1.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; (It avoids control plan=
e signalling and creates state which needs to be maintained, and that sound=
s as a very expensive operation).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; Alternate is to just sa=
y as Lucy suggests, and restrict MD Type-1 Service Chain SF=92s per allocat=
ion scheme. This is a solution that works, albeit it is a very impacting re=
striction for flexibility and resource sharing).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; G/<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; On 18/10/2016, 16:49, &=
quot;sfc on behalf of Lucy yong&quot; &lt;<a href=3D"mailto:sfc-bounces@iet=
f.org%20on%20behalf%20of%20lucy.yong@huawei.com"><span style=3D"color:purpl=
e">sfc-bounces@ietf.org on behalf of lucy.yong@huawei.com</span></a>&gt; wr=
ote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Comme=
nt on &quot;Allocating a nibble or byte within the 32 bytes (probably the f=
irst nibble or byte) is yet another.&quot;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy:=
 Technically We can do this on MD#1, but NSH already defines MD#2. Is the v=
ariable length the only feature that hardware can't deal with?<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; -----=
Original Message-----<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; From:=
 Ron Parker [<a href=3D"mailto:Ron_Parker@affirmednetworks.com"><span style=
=3D"color:purple">mailto:Ron_Parker@affirmednetworks.com</span></a>]<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Sent:=
 Tuesday, October 18, 2016 10:05 AM<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; To: L=
ucy yong; Joel M. Halpern;<span class=3D"apple-converted-space">&nbsp;</spa=
n><a href=3D"mailto:sfc@ietf.org"><span style=3D"color:purple">sfc@ietf.org=
</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Subje=
ct: RE: [sfc] metadata type 1 constraint<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Even =
though the interpretation of metadata is dependent on control plane interac=
tion, where I think the original proposal has value is that there might be =
multiple separate interpretations simultaneously within the same administra=
tive domain.&nbsp;&nbsp;
 A way to describe, on the wire, which of those interpretations is in force=
 for that particular SFP seems valuable to me.&nbsp;&nbsp; You could defini=
tely argue that the control plane could install the interpretation locally =
on a per SFP basis;&nbsp; also being explicit on
 the wire will likely enhance interoperability and debuggability.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; The v=
alue would be locally significant within the administrative domain (i.e., m=
etadata schema 1, metatadata schema 2, etc.).&nbsp;&nbsp; Overloading lengt=
h is one way.&nbsp;&nbsp; Overloading MD-type is another.&nbsp;&nbsp; Alloc=
ating a nibble or byte within the 32 bytes
 (probably the first nibble or byte) is yet another.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; Ron<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; -----=
Original Message-----<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; From:=
 sfc [<a href=3D"mailto:sfc-bounces@ietf.org"><span style=3D"color:purple">=
mailto:sfc-bounces@ietf.org</span></a>] On Behalf Of Lucy yong<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Sent:=
 Tuesday, October 18, 2016 10:27 AM<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; To: J=
oel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.com"><span style=3D"co=
lor:purple">jmh@joelhalpern.com</span></a>&gt;;<span class=3D"apple-convert=
ed-space">&nbsp;</span><a href=3D"mailto:sfc@ietf.org"><span style=3D"color=
:purple">sfc@ietf.org</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Subje=
ct: Re: [sfc] metadata type 1 constraint<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Joel,=
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy,=
 while your two text proposals are not wrong, I do not see them as adding a=
ny clarity to the document.&nbsp; The sections are very short and clearly d=
efine only the syntax.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; [Lucy=
] True. However, for this document, readers expect Section 3 to describe NS=
H syntax and semantics. Section 3.1-3.3 do both. If section 3.4 and 3.5 jus=
t specify the syntax, from documenting perspective, it is important to expl=
icitly state
 the two text out.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; With =
regard to SF and MD-1 support, there is absolutely nothing that requires an=
 SF to support only one MD-1 structure.&nbsp; Rather, the control mechanism=
s will tell the SF how to extract the data it needs from the MD-1 header.<b=
r>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; [Lucy=
] This puts much uncertainty for a single SF on what to implement, which ca=
uses people's concern. IMO, if we don't have a way to address this challeng=
e here (you stated in interim meeting), pushing it to another place does no=
t solve/address
 it. For example,&nbsp; will the control mechanisms tell an SF how to extra=
ct the data it needs from the MD-1 header per a SFP, or per a SFC, or for a=
ll SFC packets, or per payload flow, or combination of them? This will sign=
ificantly impact SF implementation. The
 reason having MD type 1 is that is hardware friendly. Leaving these uncert=
ainty open, not sure if the reason still makes a sense.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; I bel=
ieve there is already text in the control plane requirements document that =
describes the need for this control functionality.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Yours=
,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Joel<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; On 10=
/17/16 11:07 AM, Lucy yong wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Suggestions:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Section 3.4 should mention that this section only defines MD type 1<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
format. The semantics of MD Type 1 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
document. Thus, the use of MD type 1 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
document.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Section 3.5 should mention that this section only defines MEF type 2<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
format. The semantics of MD type 2 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
document. Thus, the use of MD type 2 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
documents.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
IMO: these statements are important for the sections.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Joel, MD semantics is critical for SFs. More than one semantics of MD<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
type 1 MUST NOT be specified for a SF. This should be a requirement in<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
the SFC arch. as a result of NSH design's, but the architecture is<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
already published. Maybe control plane requirement is the place to<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
state this out as the result of SFC arch and NSH design.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Thanks, Lucy<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
-----Original Message----- From: sfc [<a href=3D"mailto:sfc-bounces@ietf.or=
g"><span style=3D"color:purple">mailto:sfc-bounces@ietf.org</span></a>] On<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:39 PM To:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Lucy yong;<span class=3D"apple-converted-space">&nbsp;</span><a href=3D"mai=
lto:sfc@ietf.org"><span style=3D"color:purple">sfc@ietf.org</span></a><span=
 class=3D"apple-converted-space">&nbsp;</span>Subject: Re: [sfc] metadata t=
ype 1 constraint<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
A) I woud not want to state any such constraint in the NSH document,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
because B) In fact, the SFP ID is in every NSH header.&nbsp; So yes, there<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
is context if it is needed<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
It is true that MD-2 is more flexible than MD-1.&nbsp; I don't think anyone=
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
disagrees with that.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Yours, Joel<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
On 10/16/16 3:25 PM, Lucy yong wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; RFC7665 (SFC architecture) states&nbsp; &quot;This architecture allows =
an SF to<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; be part of multiple SFPs and SFCs.&quot;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; NSH just specifies MD type1 with a 16 bytes field, and&nbsp; NSH doc.<b=
r>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; states<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; 3.&nbsp; NSH provides a mechanism to carry shared metadata between<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; participating entities and service functions.&nbsp; The semantics of<br=
>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; the shared metadata is communicated via a control plane, which is<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; outside the scope of this document, to participating nodes.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; Comments: this mean: when an SF that is part of multiple SFCs and MD<br=
>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; type 1 is used in some of SFCs, these SFCs MUST have the same<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; metadata semantics.&nbsp; This is because that NSH does not convey SFC<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; identifier. For MD type 2, different SFCs may insert different list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; of TLVs and each TLV has a type and specified semantics along (the<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; TLVs will be specified in different doc.).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; Should we state out this constraint in NSH doc.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; Lucy<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; _______________________________________________ sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<span class=3D"apple-converted-space">&nbsp;</span><a href=3D"mailto:sfc=
@ietf.org"><span style=3D"color:purple">sfc@ietf.org</span></a><span class=
=3D"apple-converted-space">&nbsp;</span><a href=3D"https://www.ietf.org/mai=
lman/listinfo/sfc"><span style=3D"color:purple">https://www.ietf.org/mailma=
n/listinfo/sfc</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
_______________________________________________ sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
span class=3D"apple-converted-space">&nbsp;</span><a href=3D"mailto:sfc@iet=
f.org"><span style=3D"color:purple">sfc@ietf.org</span></a><span class=3D"a=
pple-converted-space">&nbsp;</span><a href=3D"https://www.ietf.org/mailman/=
listinfo/sfc"><span style=3D"color:purple">https://www.ietf.org/mailman/lis=
tinfo/sfc</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; _____=
__________________________________________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; sfc m=
ailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span><a href=3D"mailto:sfc@ietf.org=
"><span style=3D"color:purple">sfc@ietf.org</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span><a href=3D"https://www.ietf.or=
g/mailman/listinfo/sfc"><span style=3D"color:purple">https://www.ietf.org/m=
ailman/listinfo/sfc</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; _____=
__________________________________________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; sfc m=
ailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span><a href=3D"mailto:sfc@ietf.org=
"><span style=3D"color:purple">sfc@ietf.org</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span><a href=3D"https://www.ietf.or=
g/mailman/listinfo/sfc"><span style=3D"color:purple">https://www.ietf.org/m=
ailman/listinfo/sfc</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;<span class=3D"apple-convert=
ed-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; ___________________________=
____________________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;<span class=3D"apple-convert=
ed-space">&nbsp;</span><a href=3D"mailto:sfc@ietf.org"><span style=3D"color=
:purple">sfc@ietf.org</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;<span class=3D"apple-convert=
ed-space">&nbsp;</span><a href=3D"https://www.ietf.org/mailman/listinfo/sfc=
"><span style=3D"color:purple">https://www.ietf.org/mailman/listinfo/sfc</s=
pan></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-sp=
ace">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ________________________________=
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From: "Jim Guichard (jguichar)" <jguichar@cisco.com>
To: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
Thread-Topic: [sfc] metadata type 1 constraint
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Date: Wed, 26 Oct 2016 11:43:58 +0000
Message-ID: <346534A7-A025-441A-9D8A-05EC1153F863@cisco.com>
References: <2691CE0099834E4A9C5044EEC662BB9D572E17C7@dfweml501-mbb> <16dbb343-f630-9e02-2e30-71b9417a620b@joelhalpern.com> <2691CE0099834E4A9C5044EEC662BB9D572E19A9@dfweml501-mbb> <c2ecc85b-b972-07ab-2127-38152ccdf8e9@joelhalpern.com> <2691CE0099834E4A9C5044EEC662BB9D572E1FB3@dfweml501-mbb> <CDF2F015F4429F458815ED2A6C2B6B0B838F8DC8@MBX021-W3-CA-2.exch021.domain.local> <2691CE0099834E4A9C5044EEC662BB9D572E20CE@dfweml501-mbb> <26723B93-0511-46DA-8EC5-581E9AF88EB7@alcatel-lucent.com> <b9b7ab83-7656-68a0-7b1e-b7904529f572@joelhalpern.com> <72836835-1674-4A1F-9AD3-AB084436BE68@cisco.com> <F050A823-C902-493D-A660-C77003BBA610@alcatel-lucent.com> <3C278B10-6EAB-4007-83E3-1EBDBD104664@alcatel-lucent.com> <0btu0gjrd9wd4r1sgre215ff.1477053881498@email.android.com> <2691CE0099834E4A9C5044EEC662BB9D572E368A@dfweml501-mbb> <1D51A977-95C6-49D7-BE36-365DD95BDE51@cisco.com> <2691CE0099834E4A9C5044EEC662BB9D572E4FDA@dfweml501-mbb> <6C0BA72D-A102-4592-BEDB-2905DA8B49CB@alcatel-lucent.com> <6F0E435A-47EA-435F-AC3D-7262FEC4FEF3@cisco.com> <51EEC4A1-178A-4C70-B85C-07210D875D7D@cisco.com>, <6D2331BE-E026-4E97-BAC6-2B9FC3F5F7FA@alcatel-lucent.com>
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Subject: Re: [sfc] metadata type 1 constraint
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Hi Gunter,

That is incorrect. The WG agreed upon the currently documented solution and=
 unless a consensus call is made to change it the document will move forwar=
d as is.

Jim

Sent from my iPhone

On Oct 26, 2016, at 5:26 AM, Van De Velde, Gunter (Nokia - BE) <gunter.van_=
de_velde@nokia.com<mailto:gunter.van_de_velde@nokia.com>> wrote:

>From the below I understand that during IETF97 the topic will be placed on =
the agenda as Linda suggested, correct?

G/



From: sfc <sfc-bounces@ietf.org<mailto:sfc-bounces@ietf.org>> on behalf of =
"Jim Guichard (jguichar)" <jguichar@cisco.com<mailto:jguichar@cisco.com>>
Date: Tuesday, 25 October 2016 at 22:38
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com<mailto:cpignata@cisco=
.com>>, "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com<=
mailto:gunter.van_de_velde@nokia.com>>
Cc: "Paul Quinn (paulq)" <paulq@cisco.com<mailto:paulq@cisco.com>>, Lucy yo=
ng <lucy.yong@huawei.com<mailto:lucy.yong@huawei.com>>, "sfc@ietf.org<mailt=
o:sfc@ietf.org>" <sfc@ietf.org<mailto:sfc@ietf.org>>
Subject: Re: [sfc] metadata type 1 constraint

Dear SFC WG:

[Chair hat on] ..

While this discussion has been interesting, a protracted debate on a proble=
m for which a workable control plane solution exists is unfortunate.

As a WG we need to make progress with the SFC encapsulation. I would make t=
he following observations:

  *   The NSH document has already completed WG LC and is waiting for chair=
 approval to submit to IESG for publication.
  *   There is no way to call consensus for a specific change as there are =
so many alternatives on the table.
I would like to give this discussion the rest of the week to reach a single=
 proposal that has enough WG agreement so that the chairs may reasonably as=
k for WG consensus or disagreement. In the absence of WG agreement to a cha=
nge then we will proceed with the known workable solution and forward the N=
SH document to the IESG for publication.

Thanks!

Jim

From: sfc <sfc-bounces@ietf.org<mailto:sfc-bounces@ietf.org>> on behalf of =
"Carlos Pignataro (cpignata)" <cpignata@cisco.com<mailto:cpignata@cisco.com=
>>
Date: Tuesday, October 25, 2016 at 10:37 AM
To: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com<mail=
to:gunter.van_de_velde@nokia.com>>
Cc: Paul Quinn <paulq@cisco.com<mailto:paulq@cisco.com>>, "sfc@ietf.org<mai=
lto:sfc@ietf.org>" <sfc@ietf.org<mailto:sfc@ietf.org>>, Lucy yong <lucy.yon=
g@huawei.com<mailto:lucy.yong@huawei.com>>
Subject: Re: [sfc] metadata type 1 constraint

Gunter,

There's clearly a trade off and a set of pros and cons for having a header =
being self-describing versus non-self-describing. Similarly, there's a bala=
nce in where we place state.

However, you are making some bold statements below, and I'd like to underst=
and some more. I'm not pushing a position, I just seem to be missing someth=
ing from your argument.

Saying that a non-self-describing packet / non stateless SF hurts interoper=
ability to the point of uselessness, is attaching that description to MPLS =
Labels or L2TPv3 encapsulation. Those don't have explicit indications.

You are advocating for an indication of allocation type in the packet. That=
's not unreasonable in itself, it is a sensible question.

But that is not "stateless" as you call it, because the SF still holds stat=
e indexed by SPI, and in any case would need to hold state on what each all=
ocation type means, which implicitly happens without an allocation type. Bo=
th need state, both need a control plane to work.

In other words, it seems to me that both (with or without an allocation typ=
e) have the *exact* same interoperability requirements and characteristics.=
 The details are different of course, but below seems like FUD.

So, without pushing for any particular method, I'd really would like to und=
erstand your technical rational in more details.

You say "marginally useable when interoperability", "dubious usefulness and=
 adds significant operational complexity", and "a formally standardized all=
ocation scheme". The latter should exist in both cases (whether you put it =
in the packet or not). And while I understand your preference of an explici=
t allocation type, I still do not understand why.

How exactly the current approach with interoperable running code hurts inte=
roperability?

Thumb typed by Carlos Pignataro.
Excuze typofraphicak errows

On Oct 25, 2016, at 00:55, Van De Velde, Gunter (Nokia - BE) <gunter.van_de=
_velde@nokia.com<mailto:gunter.van_de_velde@nokia.com>> wrote:
I agree with Lucy and Dave regarding the futile usefulness of MD#1.

The value of a fixed and predictable MD size is clear, however the lack of =
signalling to indicate in stateless manner the used NSH MD#1 allocation sch=
eme makes this type of NSH header only marginally useable when interoperabi=
lity of Service function behaviour is required or when a single SF needs to=
 service packets of different NSH MD#1 allocation scheme=92s.

The text proposed for adding to MD#1 is not fixing this, however it is maki=
ng it more clear to the user that MD#1 is from interoperability perspective=
 rather dubious and adds significant operational complexity.

If the intent is to make MD#1 more valuable and if we desire to bank upon t=
he benefits of a fixed size 16 octets context field, then maybe a compromis=
e needs to be made, and some effort be explored to add into the NSH MD#1 a =
context allocation scheme indication? Or, we create MD#3, MD#4, etc each ha=
ving a fixed 16-octet size and a formally documented and standardized alloc=
ation scheme.

G/

From: sfc <sfc-bounces@ietf.org<mailto:sfc-bounces@ietf.org>> on behalf of =
Lucy yong <lucy.yong@huawei.com<mailto:lucy.yong@huawei.com>>
Date: Tuesday, 25 October 2016 at 03:04
To: "Paul Quinn (paulq)" <paulq@cisco.com<mailto:paulq@cisco.com>>
Cc: "sfc@ietf.org<mailto:sfc@ietf.org>" <sfc@ietf.org<mailto:sfc@ietf.org>>
Subject: Re: [sfc] metadata type 1 constraint

Paul,

If NSH has to support MD-1 with 16-bytes datablock,  please consider adding=
 the additional text we proposed, which addresses interworking concern.

I think that for the MD-2, it also needs to add some rules about when a SFC=
-aware SF is configured to use metadata and receives MD-2, if it does not u=
nderstand the MD class and/or type, it MUST NOT process the packet, et al.

Lucy




From: Paul Quinn (paulq) [mailto:paulq@cisco.com]
Sent: Monday, October 24, 2016 4:23 PM
To: Lucy yong
Cc: sfc@ietf.org<mailto:sfc@ietf.org>
Subject: Re: [sfc] metadata type 1 constraint

Hi Lucy,

The value of a fixed size header as a MUST is significant from many perspec=
tives, including but not limited to:

Implementations, including software implementations, benefit form the predi=
ctability of a fixed size header. One only needs to look at the lack of wid=
ely deployed variable length data plane protocols to see this in practice.

>From an operational perspective, having a bounded (small) number of metadat=
a to work with helps to bound the policy expression, which after all is the=
 main use of the metadata.

There are existing implementations that demonstrate the applicability of MD=
 Type 1 to a wide-range of use cases, and those implementation reap the ben=
efits of the two aforementioned points.

Paul

On Oct 21, 2016, at 6:48 PM, Lucy yong <lucy.yong@huawei.com<mailto:lucy.yo=
ng@huawei.com>> wrote:

If we intend to standardize metadata structure per an SFC application, I wo=
nder why NSH needs MD#1? MD#2 can support all SFC needs. MD#2 even support =
expert review metadata class, experimental metadata class as well. Should c=
onsider removing MD#1?

Lucy

From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Vigoureux, Martin (Nok=
ia - FR)
Sent: Friday, October 21, 2016 7:56 AM
To: Van De Velde, Gunter (Nokia - BE); Paul Quinn (paulq); Joel M. Halpern
Cc: sfc@ietf.org<mailto:sfc@ietf.org>
Subject: Re: [sfc] metadata type 1 constraint

>From the latest discussion I wonder if the allocation drafts shouldn't in f=
act define their own MD type (3, 4, ...).

If there is a need/use for that, a TLV for framing these MDs in MD2 could b=
e defined, as sfc-nsh-tlv now does.

I'd in any case prefer to avoid duplicating specifications across documents=
, and as such sfc-nsh-tlv should only reference the encodings, not replicat=
e them.

-m


-------- Message d'origine --------
De : "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com<mai=
lto:gunter.van_de_velde@nokia.com>>
Date :21/10/2016 14:36 (GMT+01:00)
=C0 : "Paul Quinn (paulq)" <paulq@cisco.com<mailto:paulq@cisco.com>>, "Joel=
 M. Halpern" <jmh@joelhalpern.com<mailto:jmh@joelhalpern.com>>
Cc : sfc@ietf.org<mailto:sfc@ietf.org>
Objet : Re: [sfc] metadata type 1 constraint
The good news is that draft draft-quinn-sfc-nsh-tlv-02.txt now has a fix su=
ggesting context allocation scheme encoding:

https://tools.ietf.org/rfcdiff?
  url1=3Dhttps://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-01.txt
  &url2=3Dhttps://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-02.txt

However, if the intent is that MD#1 is Opaque, then why even try to suggest=
 encodings for it? Opaque info is opaque info=85 either you define it, or y=
ou do not define it=85 anything else is confusing and contradicting from op=
erational and implementation perspective.

I would prefer to see that both =93Data Center Allocation=94 and =93Mobilit=
y/Broadband Allocation=94 drafts are written with intended main usage in a =
MD#2, instead of MD#1 as then it is a complete and interoperable allocation=
 scheme usage with significantly reduced operational overhead and restricti=
ons. Assuming the length of these allocation blobs fixed at 16 octets for p=
otentially stuffing them in a MD#1 sounds fine.

G/



On 19/10/2016, 17:22, "sfc on behalf of Van De Velde, Gunter (Nokia - BE)" =
<sfc-bounces@ietf.org on behalf of gunter.van_de_velde@nokia.com<mailto:sfc=
-bounces@ietf.org%20on%20behalf%20of%20gunter.van_de_velde@nokia.com>> wrot=
e:

    It is sad that we significantly increase the operational burden for all=
ocation scheme signalling for MD#1. I am dazzled the WG believes stateful s=
ignalling is easier for deployment compared with a stateless solution for M=
D#1. The imposed operational complexity is significant with current proposa=
l.

    G/




    On 19/10/2016, 15:33, "sfc on behalf of Paul Quinn (paulq)" <sfc-bounce=
s@ietf.org on behalf of paulq@cisco.com<mailto:sfc-bounces@ietf.org%20on%20=
behalf%20of%20paulq@cisco.com>> wrote:

        Joel,

        I agree with you: the current approach is simple and workable.  The=
 allocation scheme are simply information examples.

        Paul

        > On Oct 18, 2016, at 8:14 PM, Joel M. Halpern <jmh@joelhalpern.com=
<mailto:jmh@joelhalpern.com>> wrote:
        >
        > Our current approach is to allow definition of allocation schemes=
, but not to mandate any specific allocation scheme for MD-1.
        > That seems to me to be a good approach, workable, and what we hav=
e agreed and documented.
        >
        > Yours,
        > Joel
        >
        > On 10/18/16 12:09 PM, Van De Velde, Gunter (Nokia - BE) wrote:
        >> If NSH MD Type-1 defines for the metadata to be Opaque, then we =
should not make an effort to define it, and just tread it as Opaque content=
 imo and live with the consequences=85and in that case use MD Type-2 for th=
ese types of well known metadata transport mechanisms.
        >>
        >> If however, we decide to define the allocation schemes, then we =
should also architect an indicator for the used allocation scheme.
        >> At this point in time, there models were suggested (overload Len=
gth, overload MD type, use few bits of MD context data).
        >> I strongly believe there is value in having the metadata allocat=
ion structure signalled within the NSH itself, even for MD Type-1.
        >> (It avoids control plane signalling and creates state which need=
s to be maintained, and that sounds as a very expensive operation).
        >>
        >> Alternate is to just say as Lucy suggests, and restrict MD Type-=
1 Service Chain SF=92s per allocation scheme. This is a solution that works=
, albeit it is a very impacting restriction for flexibility and resource sh=
aring).
        >>
        >> G/
        >>
        >>
        >> On 18/10/2016, 16:49, "sfc on behalf of Lucy yong" <sfc-bounces@=
ietf.org on behalf of lucy.yong@huawei.com<mailto:sfc-bounces@ietf.org%20on=
%20behalf%20of%20lucy.yong@huawei.com>> wrote:
        >>
        >>    Comment on "Allocating a nibble or byte within the 32 bytes (=
probably the first nibble or byte) is yet another."
        >>
        >>    Lucy: Technically We can do this on MD#1, but NSH already def=
ines MD#2. Is the variable length the only feature that hardware can't deal=
 with?
        >>
        >>    Lucy
        >>
        >>    -----Original Message-----
        >>    From: Ron Parker [mailto:Ron_Parker@affirmednetworks.com]
        >>    Sent: Tuesday, October 18, 2016 10:05 AM
        >>    To: Lucy yong; Joel M. Halpern; sfc@ietf.org<mailto:sfc@ietf.=
org>
        >>    Subject: RE: [sfc] metadata type 1 constraint
        >>
        >>    Even though the interpretation of metadata is dependent on co=
ntrol plane interaction, where I think the original proposal has value is t=
hat there might be multiple separate interpretations simultaneously within =
the same administrative domain.   A way to describe, on the wire, which of =
those interpretations is in force for that particular SFP seems valuable to=
 me.   You could definitely argue that the control plane could install the =
interpretation locally on a per SFP basis;  also being explicit on the wire=
 will likely enhance interoperability and debuggability.
        >>
        >>    The value would be locally significant within the administrat=
ive domain (i.e., metadata schema 1, metatadata schema 2, etc.).   Overload=
ing length is one way.   Overloading MD-type is another.   Allocating a nib=
ble or byte within the 32 bytes (probably the first nibble or byte) is yet =
another.
        >>
        >>       Ron
        >>
        >>
        >>    -----Original Message-----
        >>    From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Lucy yon=
g
        >>    Sent: Tuesday, October 18, 2016 10:27 AM
        >>    To: Joel M. Halpern <jmh@joelhalpern.com<mailto:jmh@joelhalpe=
rn.com>>; sfc@ietf.org<mailto:sfc@ietf.org>
        >>    Subject: Re: [sfc] metadata type 1 constraint
        >>
        >>    Joel,
        >>
        >>    Lucy, while your two text proposals are not wrong, I do not s=
ee them as adding any clarity to the document.  The sections are very short=
 and clearly define only the syntax.
        >>    [Lucy] True. However, for this document, readers expect Secti=
on 3 to describe NSH syntax and semantics. Section 3.1-3.3 do both. If sect=
ion 3.4 and 3.5 just specify the syntax, from documenting perspective, it i=
s important to explicitly state the two text out.
        >>
        >>    With regard to SF and MD-1 support, there is absolutely nothi=
ng that requires an SF to support only one MD-1 structure.  Rather, the con=
trol mechanisms will tell the SF how to extract the data it needs from the =
MD-1 header.
        >>    [Lucy] This puts much uncertainty for a single SF on what to =
implement, which causes people's concern. IMO, if we don't have a way to ad=
dress this challenge here (you stated in interim meeting), pushing it to an=
other place does not solve/address it. For example,  will the control mecha=
nisms tell an SF how to extract the data it needs from the MD-1 header per =
a SFP, or per a SFC, or for all SFC packets, or per payload flow, or combin=
ation of them? This will significantly impact SF implementation. The reason=
 having MD type 1 is that is hardware friendly. Leaving these uncertainty o=
pen, not sure if the reason still makes a sense.
        >>
        >>    Lucy
        >>    I believe there is already text in the control plane requirem=
ents document that describes the need for this control functionality.
        >>
        >>
        >>
        >>    Yours,
        >>    Joel
        >>
        >>    On 10/17/16 11:07 AM, Lucy yong wrote:
        >>    > Suggestions:
        >>    >
        >>    > Section 3.4 should mention that this section only defines M=
D type 1
        >>    > format. The semantics of MD Type 1 is outside the scope of =
this
        >>    > document. Thus, the use of MD type 1 is outside the scope o=
f this
        >>    > document.
        >>    >
        >>    > Section 3.5 should mention that this section only defines M=
EF type 2
        >>    > format. The semantics of MD type 2 is outside the scope of =
this
        >>    > document. Thus, the use of MD type 2 is outside the scope o=
f this
        >>    > documents.
        >>    >
        >>    > IMO: these statements are important for the sections.
        >>    >
        >>    > Joel, MD semantics is critical for SFs. More than one seman=
tics of MD
        >>    > type 1 MUST NOT be specified for a SF. This should be a req=
uirement in
        >>    > the SFC arch. as a result of NSH design's, but the architec=
ture is
        >>    > already published. Maybe control plane requirement is the p=
lace to
        >>    > state this out as the result of SFC arch and NSH design.
        >>    >
        >>    > Thanks, Lucy
        >>    >
        >>    > -----Original Message----- From: sfc [mailto:sfc-bounces@ie=
tf.org] On
        >>    > Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:=
39 PM To:
        >>    > Lucy yong; sfc@ietf.org<mailto:sfc@ietf.org> Subject: Re: [=
sfc] metadata type 1 constraint
        >>    >
        >>    > A) I woud not want to state any such constraint in the NSH =
document,
        >>    > because B) In fact, the SFP ID is in every NSH header.  So =
yes, there
        >>    > is context if it is needed
        >>    >
        >>    > It is true that MD-2 is more flexible than MD-1.  I don't t=
hink anyone
        >>    > disagrees with that.
        >>    >
        >>    > Yours, Joel
        >>    >
        >>    > On 10/16/16 3:25 PM, Lucy yong wrote:
        >>    >> RFC7665 (SFC architecture) states  "This architecture allo=
ws an SF to
        >>    >> be part of multiple SFPs and SFCs."
        >>    >>
        >>    >>
        >>    >>
        >>    >> NSH just specifies MD type1 with a 16 bytes field, and  NS=
H doc.
        >>    >> states
        >>    >>
        >>    >> 3.  NSH provides a mechanism to carry shared metadata betw=
een
        >>    >>
        >>    >> participating entities and service functions.  The semanti=
cs of
        >>    >>
        >>    >> the shared metadata is communicated via a control plane, w=
hich is
        >>    >>
        >>    >> outside the scope of this document, to participating nodes=
.
        >>    >>
        >>    >>
        >>    >>
        >>    >> Comments: this mean: when an SF that is part of multiple S=
FCs and MD
        >>    >> type 1 is used in some of SFCs, these SFCs MUST have the s=
ame
        >>    >> metadata semantics.  This is because that NSH does not con=
vey SFC
        >>    >> identifier. For MD type 2, different SFCs may insert diffe=
rent list
        >>    >> of TLVs and each TLV has a type and specified semantics al=
ong (the
        >>    >> TLVs will be specified in different doc.).
        >>    >>
        >>    >>
        >>    >>
        >>    >> Should we state out this constraint in NSH doc.
        >>    >>
        >>    >>
        >>    >>
        >>    >> Lucy
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >>
        >>    >> _______________________________________________ sfc mailin=
g list
        >>    >> sfc@ietf.org<mailto:sfc@ietf.org> https://www.ietf.org/mai=
lman/listinfo/sfc
        >>    >>
        >>    >
        >>    > _______________________________________________ sfc mailing=
 list
        >>    > sfc@ietf.org<mailto:sfc@ietf.org> https://www.ietf.org/mail=
man/listinfo/sfc
        >>    >
        >>
        >>    _______________________________________________
        >>    sfc mailing list
        >>    sfc@ietf.org<mailto:sfc@ietf.org>
        >>    https://www.ietf.org/mailman/listinfo/sfc
        >>
        >>    _______________________________________________
        >>    sfc mailing list
        >>    sfc@ietf.org<mailto:sfc@ietf.org>
        >>    https://www.ietf.org/mailman/listinfo/sfc
        >>
        >>
        >
        > _______________________________________________
        > sfc mailing list
        > sfc@ietf.org<mailto:sfc@ietf.org>
        > https://www.ietf.org/mailman/listinfo/sfc

        _______________________________________________
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        sfc@ietf.org<mailto:sfc@ietf.org>
        https://www.ietf.org/mailman/listinfo/sfc


    _______________________________________________
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    sfc@ietf.org<mailto:sfc@ietf.org>
    https://www.ietf.org/mailman/listinfo/sfc


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--_000_346534A7A025441A9D8A05EC1153F863ciscocom_
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<div>
<div style=3D"direction: inherit;">Hi Gunter,</div>
<div style=3D"direction: inherit;"><br>
</div>
<div style=3D"direction: inherit;">That is incorrect. The WG agreed upon th=
e currently documented solution and unless a consensus call is made to chan=
ge it the document will move forward as is.</div>
<div style=3D"direction: inherit;"><br>
</div>
<div style=3D"direction: inherit;">Jim</div>
<br>
Sent from my iPhone</div>
<div><br>
On Oct 26, 2016, at 5:26 AM, Van De Velde, Gunter (Nokia - BE) &lt;<a href=
=3D"mailto:gunter.van_de_velde@nokia.com">gunter.van_de_velde@nokia.com</a>=
&gt; wrote:<br>
<br>
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<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">From the below I understand that during IETF97 =
the topic will be placed on the agenda as Linda suggested, correct?<o:p></o=
:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">G/
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-family:Calibri;color:black">F=
rom: </span>
</b><span style=3D"font-family:Calibri;color:black">sfc &lt;<a href=3D"mail=
to:sfc-bounces@ietf.org">sfc-bounces@ietf.org</a>&gt; on behalf of &quot;Ji=
m Guichard (jguichar)&quot; &lt;<a href=3D"mailto:jguichar@cisco.com">jguic=
har@cisco.com</a>&gt;<br>
<b>Date: </b>Tuesday, 25 October 2016 at 22:38<br>
<b>To: </b>&quot;Carlos Pignataro (cpignata)&quot; &lt;<a href=3D"mailto:cp=
ignata@cisco.com">cpignata@cisco.com</a>&gt;, &quot;Van De Velde, Gunter (N=
okia - BE)&quot; &lt;<a href=3D"mailto:gunter.van_de_velde@nokia.com">gunte=
r.van_de_velde@nokia.com</a>&gt;<br>
<b>Cc: </b>&quot;Paul Quinn (paulq)&quot; &lt;<a href=3D"mailto:paulq@cisco=
.com">paulq@cisco.com</a>&gt;, Lucy yong &lt;<a href=3D"mailto:lucy.yong@hu=
awei.com">lucy.yong@huawei.com</a>&gt;, &quot;<a href=3D"mailto:sfc@ietf.or=
g">sfc@ietf.org</a>&quot; &lt;<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org<=
/a>&gt;<br>
<b>Subject: </b>Re: [sfc] metadata type 1 constraint<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<div>
<p class=3D"MsoNormal">Dear SFC WG:<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">[Chair hat on] ..<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">While this discussion has been interesting, a protra=
cted debate on a problem for which a workable control plane solution exists=
 is unfortunate.&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">As a WG we need to make progress with the SFC encaps=
ulation. I would make the following observations:<o:p></o:p></p>
</div>
<ul type=3D"disc">
<li class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-list:l0 level1 lfo1">
The NSH document has already completed WG LC and is waiting for chair appro=
val to submit to IESG for publication.<o:p></o:p></li><li class=3D"MsoNorma=
l" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 =
level1 lfo1">
There is no way to call consensus for a specific change as there are so man=
y alternatives on the table.<o:p></o:p></li></ul>
<div>
<p class=3D"MsoNormal">I would like to give this discussion the rest of the=
 week to reach a single proposal that has enough WG agreement so that the c=
hairs may reasonably ask for WG consensus or disagreement. In the absence o=
f WG agreement to a change then we
 will proceed with the known workable solution and forward the NSH document=
 to the IESG for publication.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Thanks!<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Jim<o:p></o:p></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-family:Calibri;color:black">F=
rom: </span>
</b><span style=3D"font-family:Calibri;color:black">sfc &lt;<a href=3D"mail=
to:sfc-bounces@ietf.org">sfc-bounces@ietf.org</a>&gt; on behalf of &quot;Ca=
rlos Pignataro (cpignata)&quot; &lt;<a href=3D"mailto:cpignata@cisco.com">c=
pignata@cisco.com</a>&gt;<br>
<b>Date: </b>Tuesday, October 25, 2016 at 10:37 AM<br>
<b>To: </b>&quot;Van De Velde, Gunter (Nokia - BE)&quot; &lt;<a href=3D"mai=
lto:gunter.van_de_velde@nokia.com">gunter.van_de_velde@nokia.com</a>&gt;<br=
>
<b>Cc: </b>Paul Quinn &lt;<a href=3D"mailto:paulq@cisco.com">paulq@cisco.co=
m</a>&gt;, &quot;<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a>&quot; &lt=
;<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a>&gt;, Lucy yong &lt;<a hre=
f=3D"mailto:lucy.yong@huawei.com">lucy.yong@huawei.com</a>&gt;<br>
<b>Subject: </b>Re: [sfc] metadata type 1 constraint<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal">Gunter,<o:p></o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal">There's clearly a trade off and a set of pros and co=
ns for having a header being self-describing versus non-self-describing. Si=
milarly, there's a balance in where we place state.&nbsp;<o:p></o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal">However, you are making some bold statements below, =
and I'd like to understand some more. I'm not pushing a position, I just se=
em to be missing something from your argument.&nbsp;<o:p></o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal">Saying that a non-self-describing packet / non state=
less SF hurts interoperability to the point of uselessness, is attaching th=
at description to MPLS Labels or L2TPv3 encapsulation. Those don't have exp=
licit indications.&nbsp;<o:p></o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal">You are advocating for an indication of allocation t=
ype in the packet. That's not unreasonable in itself, it is a sensible ques=
tion.<o:p></o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal">But that is not &quot;stateless&quot; as you call it=
, because the SF still holds state indexed by SPI, and in any case would ne=
ed to hold state on what each allocation type means, which implicitly happe=
ns without an allocation type. Both need state,
 both need a control plane to work.&nbsp;<o:p></o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal">In other words, it seems to me that both (with or wi=
thout an allocation type) have the *exact* same interoperability requiremen=
ts and characteristics. The details are different of course, but below seem=
s like FUD.&nbsp;<o:p></o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal">So, without pushing for any particular method, I'd r=
eally would like to understand your technical rational in more details.&nbs=
p;<o:p></o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal">You say &quot;marginally useable when interoperabili=
ty&quot;, &quot;dubious usefulness and adds significant operational complex=
ity&quot;, and &quot;a formally standardized allocation scheme&quot;. The l=
atter should exist in both cases (whether you put it in the packet
 or not). And while I understand your preference of an explicit allocation =
type, I still do not understand why.&nbsp;<o:p></o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div id=3D"AppleMailSignature">
<p class=3D"MsoNormal">How exactly the current approach with interoperable =
running code hurts interoperability?<br>
<br>
Thumb typed by Carlos Pignataro. <o:p></o:p></p>
<div>
<p class=3D"MsoNormal">Excuze typofraphicak errows<o:p></o:p></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><br>
On Oct 25, 2016, at 00:55, Van De Velde, Gunter (Nokia - BE) &lt;<a href=3D=
"mailto:gunter.van_de_velde@nokia.com">gunter.van_de_velde@nokia.com</a>&gt=
; wrote:<o:p></o:p></p>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">I agree with Lucy and Dave regarding the futile=
 usefulness of MD#1.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">The value of a fixed and predictable MD size is=
 clear, however the lack of signalling to indicate in stateless manner the =
used NSH MD#1 allocation scheme makes
 this type of NSH header only marginally useable when interoperability of S=
ervice function behaviour is required or when a single SF needs to service =
packets of different NSH MD#1 allocation scheme=92s.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">The text proposed for adding to MD#1 is not fix=
ing this, however it is making it more clear to the user that MD#1 is from =
interoperability perspective rather
 dubious and adds significant operational complexity. </span><o:p></o:p></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">If the intent is to make MD#1 more valuable and=
 if we desire to bank upon the benefits of a fixed size 16 octets context f=
ield, then maybe a compromise needs
 to be made, and some effort be explored to add into the NSH MD#1 a context=
 allocation scheme indication? Or, we create MD#3, MD#4, etc each having a =
fixed 16-octet size and a formally documented and standardized allocation s=
cheme.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">G/</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri;=
mso-fareast-language:EN-US">&nbsp;</span><o:p></o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-family:Calibri;color:black">F=
rom: </span>
</b><span style=3D"font-family:Calibri;color:black">sfc &lt;<a href=3D"mail=
to:sfc-bounces@ietf.org">sfc-bounces@ietf.org</a>&gt; on behalf of Lucy yon=
g &lt;<a href=3D"mailto:lucy.yong@huawei.com">lucy.yong@huawei.com</a>&gt;<=
br>
<b>Date: </b>Tuesday, 25 October 2016 at 03:04<br>
<b>To: </b>&quot;Paul Quinn (paulq)&quot; &lt;<a href=3D"mailto:paulq@cisco=
.com">paulq@cisco.com</a>&gt;<br>
<b>Cc: </b>&quot;<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a>&quot; &lt=
;<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a>&gt;<br>
<b>Subject: </b>Re: [sfc] metadata type 1 constraint</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">Paul,</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">If NSH has to support MD-1 with 16-bytes datablock, &nbsp=
;please consider adding the additional text we proposed, which addresses in=
terworking concern.</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">I think that for the MD-2, it also needs to add some rule=
s about when a SFC-aware SF is configured to use metadata and receives MD-2=
, if it does not understand the MD class
 and/or type, it MUST NOT process the packet, et al.</span></i><o:p></o:p><=
/p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">Lucy</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:Tahom=
a">From:</span></b><span style=3D"font-size:10.0pt;font-family:Tahoma"> Pau=
l Quinn (paulq) [<a href=3D"mailto:paulq@cisco.com">mailto:paulq@cisco.com<=
/a>]
<br>
<b>Sent:</b> Monday, October 24, 2016 4:23 PM<br>
<b>To:</b> Lucy yong<br>
<b>Cc:</b> <a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a><br>
<b>Subject:</b> Re: [sfc] metadata type 1 constraint</span><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div>
<p class=3D"MsoNormal">Hi Lucy, <o:p></o:p></p>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">The value of a fixed size header as a MUST is signif=
icant from many perspectives, including but not limited to:<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Implementations, including software implementations,=
 benefit form the predictability of a fixed size header. One only needs to =
look at the lack of widely deployed variable length data plane protocols to=
 see this in practice.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">From an operational perspective, having a bounded (s=
mall) number of metadata to work with helps to bound the policy expression,=
 which after all is the main use of the metadata.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">There are existing implementations that demonstrate =
the applicability of MD Type 1 to a wide-range of use cases, and those impl=
ementation reap the benefits of the two aforementioned points.<o:p></o:p></=
p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Paul<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal">On Oct 21, 2016, at 6:48 PM, Lucy yong &lt;<a href=
=3D"mailto:lucy.yong@huawei.com">lucy.yong@huawei.com</a>&gt; wrote:<o:p></=
o:p></p>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">If we intend to standardize metadata structure per an SFC=
 application, I wonder why NSH needs MD#1? MD#2 can support all SFC needs. =
MD#2 even support expert review metadata
 class, experimental metadata class as well. Should consider removing MD#1?=
</span></i><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">Lucy</span></i><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><i><span style=3D"font-size:11.0pt;font-family:Calib=
ri;color:#1F497D">&nbsp;</span></i><o:p></o:p></p>
</div>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<div>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:Tahom=
a">From:</span></b><span class=3D"apple-converted-space"><span style=3D"fon=
t-size:10.0pt;font-family:Tahoma">&nbsp;</span></span><span style=3D"font-s=
ize:10.0pt;font-family:Tahoma">sfc [<a href=3D"mailto:sfc-bounces@ietf.org"=
><span style=3D"color:purple">mailto:sfc-bounces@ietf.org</span></a>]<span =
class=3D"apple-converted-space">&nbsp;</span><b>On
 Behalf Of<span class=3D"apple-converted-space">&nbsp;</span></b>Vigoureux,=
 Martin (Nokia - FR)<br>
<b>Sent:</b><span class=3D"apple-converted-space">&nbsp;</span>Friday, Octo=
ber 21, 2016 7:56 AM<br>
<b>To:</b><span class=3D"apple-converted-space">&nbsp;</span>Van De Velde, =
Gunter (Nokia - BE); Paul Quinn (paulq); Joel M. Halpern<br>
<b>Cc:</b><span class=3D"apple-converted-space">&nbsp;</span><a href=3D"mai=
lto:sfc@ietf.org"><span style=3D"color:purple">sfc@ietf.org</span></a><br>
<b>Subject:</b><span class=3D"apple-converted-space">&nbsp;</span>Re: [sfc]=
 metadata type 1 constraint</span><o:p></o:p></p>
</div>
</div>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal">From the latest discussion I wonder if the allocatio=
n drafts shouldn't in fact define their own MD type (3, 4, ...).<br>
<br>
If there is a need/use for that, a TLV for framing these MDs in MD2 could b=
e defined, as sfc-nsh-tlv now does.<br>
<br>
I'd in any case prefer to avoid duplicating specifications across documents=
, and as such sfc-nsh-tlv should only reference the encodings, not replicat=
e them.<br>
<br>
-m<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><br>
<br>
-------- Message d'origine --------<br>
De : &quot;Van De Velde, Gunter (Nokia - BE)&quot; &lt;<a href=3D"mailto:gu=
nter.van_de_velde@nokia.com"><span style=3D"color:purple">gunter.van_de_vel=
de@nokia.com</span></a>&gt;<span class=3D"apple-converted-space">&nbsp;</sp=
an><br>
Date :21/10/2016 14:36 (GMT&#43;01:00)<span class=3D"apple-converted-space"=
>&nbsp;</span><br>
=C0 : &quot;Paul Quinn (paulq)&quot; &lt;<a href=3D"mailto:paulq@cisco.com"=
><span style=3D"color:purple">paulq@cisco.com</span></a>&gt;, &quot;Joel M.=
 Halpern&quot; &lt;<a href=3D"mailto:jmh@joelhalpern.com"><span style=3D"co=
lor:purple">jmh@joelhalpern.com</span></a>&gt;<span class=3D"apple-converte=
d-space">&nbsp;</span><br>
Cc :<span class=3D"apple-converted-space">&nbsp;</span><a href=3D"mailto:sf=
c@ietf.org"><span style=3D"color:purple">sfc@ietf.org</span></a><span class=
=3D"apple-converted-space">&nbsp;</span><br>
Objet : Re: [sfc] metadata type 1 constraint<span class=3D"apple-converted-=
space">&nbsp;</span><o:p></o:p></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt">The good news is th=
at draft draft-quinn-sfc-nsh-tlv-02.txt now has a fix suggesting context al=
location scheme encoding:<br>
<br>
<a href=3D"https://tools.ietf.org/rfcdiff?"><span style=3D"color:purple">ht=
tps://tools.ietf.org/rfcdiff?</span></a><br>
&nbsp; url1=3D<a href=3D"https://tools.ietf.org/id/draft-quinn-sfc-nsh-tlv-=
01.txt"><span style=3D"color:purple">https://tools.ietf.org/id/draft-quinn-=
sfc-nsh-tlv-01.txt</span></a><br>
&nbsp; &amp;url2=3D<a href=3D"https://tools.ietf.org/id/draft-quinn-sfc-nsh=
-tlv-02.txt"><span style=3D"color:purple">https://tools.ietf.org/id/draft-q=
uinn-sfc-nsh-tlv-02.txt</span></a><br>
<br>
However, if the intent is that MD#1 is Opaque, then why even try to suggest=
 encodings for it? Opaque info is opaque info=85 either you define it, or y=
ou do not define it=85 anything else is confusing and contradicting from op=
erational and implementation perspective.<br>
<br>
I would prefer to see that both =93Data Center Allocation=94 and =93Mobilit=
y/Broadband Allocation=94 drafts are written with intended main usage in a =
MD#2, instead of MD#1 as then it is a complete and interoperable allocation=
 scheme usage with significantly reduced
 operational overhead and restrictions. Assuming the length of these alloca=
tion blobs fixed at 16 octets for potentially stuffing them in a MD#1 sound=
s fine.<span class=3D"apple-converted-space">&nbsp;</span><br>
<br>
G/<br>
<br>
<br>
<br>
On 19/10/2016, 17:22, &quot;sfc on behalf of Van De Velde, Gunter (Nokia - =
BE)&quot; &lt;<a href=3D"mailto:sfc-bounces@ietf.org%20on%20behalf%20of%20g=
unter.van_de_velde@nokia.com"><span style=3D"color:purple">sfc-bounces@ietf=
.org on behalf of gunter.van_de_velde@nokia.com</span></a>&gt;
 wrote:<br>
<br>
&nbsp;&nbsp;&nbsp; It is sad that we significantly increase the operational=
 burden for allocation scheme signalling for MD#1. I am dazzled the WG beli=
eves stateful signalling is easier for deployment compared with a stateless=
 solution for MD#1. The imposed operational complexity
 is significant with current proposal.<br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp; G/<br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span>=
<br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp; On 19/10/2016, 15:33, &quot;sfc on behalf of Paul Quinn =
(paulq)&quot; &lt;<a href=3D"mailto:sfc-bounces@ietf.org%20on%20behalf%20of=
%20paulq@cisco.com"><span style=3D"color:purple">sfc-bounces@ietf.org on be=
half of paulq@cisco.com</span></a>&gt; wrote:<br>
&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Joel,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-sp=
ace">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I agree with you: the current ap=
proach is simple and workable.&nbsp; The allocation scheme are simply infor=
mation examples.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-sp=
ace">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Paul<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=3D"apple-converted-sp=
ace">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; On Oct 18, 2016, at 8:14 PM=
, Joel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.com"><span style=3D=
"color:purple">jmh@joelhalpern.com</span></a>&gt; wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;<span class=3D"apple-convert=
ed-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Our current approach is to =
allow definition of allocation schemes, but not to mandate any specific all=
ocation scheme for MD-1.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; That seems to me to be a go=
od approach, workable, and what we have agreed and documented.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;<span class=3D"apple-convert=
ed-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Yours,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Joel<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;<span class=3D"apple-convert=
ed-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; On 10/18/16 12:09 PM, Van D=
e Velde, Gunter (Nokia - BE) wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; If NSH MD Type-1 define=
s for the metadata to be Opaque, then we should not make an effort to defin=
e it, and just tread it as Opaque content imo and live with the consequence=
s=85and in that case use MD Type-2 for these types of well known metadata t=
ransport
 mechanisms.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; If however, we decide t=
o define the allocation schemes, then we should also architect an indicator=
 for the used allocation scheme.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; At this point in time, =
there models were suggested (overload Length, overload MD type, use few bit=
s of MD context data).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; I strongly believe ther=
e is value in having the metadata allocation structure signalled within the=
 NSH itself, even for MD Type-1.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; (It avoids control plan=
e signalling and creates state which needs to be maintained, and that sound=
s as a very expensive operation).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; Alternate is to just sa=
y as Lucy suggests, and restrict MD Type-1 Service Chain SF=92s per allocat=
ion scheme. This is a solution that works, albeit it is a very impacting re=
striction for flexibility and resource sharing).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; G/<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt; On 18/10/2016, 16:49, &=
quot;sfc on behalf of Lucy yong&quot; &lt;<a href=3D"mailto:sfc-bounces@iet=
f.org%20on%20behalf%20of%20lucy.yong@huawei.com"><span style=3D"color:purpl=
e">sfc-bounces@ietf.org on behalf of lucy.yong@huawei.com</span></a>&gt; wr=
ote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Comme=
nt on &quot;Allocating a nibble or byte within the 32 bytes (probably the f=
irst nibble or byte) is yet another.&quot;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy:=
 Technically We can do this on MD#1, but NSH already defines MD#2. Is the v=
ariable length the only feature that hardware can't deal with?<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; -----=
Original Message-----<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; From:=
 Ron Parker [<a href=3D"mailto:Ron_Parker@affirmednetworks.com"><span style=
=3D"color:purple">mailto:Ron_Parker@affirmednetworks.com</span></a>]<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Sent:=
 Tuesday, October 18, 2016 10:05 AM<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; To: L=
ucy yong; Joel M. Halpern;<span class=3D"apple-converted-space">&nbsp;</spa=
n><a href=3D"mailto:sfc@ietf.org"><span style=3D"color:purple">sfc@ietf.org=
</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Subje=
ct: RE: [sfc] metadata type 1 constraint<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Even =
though the interpretation of metadata is dependent on control plane interac=
tion, where I think the original proposal has value is that there might be =
multiple separate interpretations simultaneously within the same administra=
tive domain.&nbsp;&nbsp;
 A way to describe, on the wire, which of those interpretations is in force=
 for that particular SFP seems valuable to me.&nbsp;&nbsp; You could defini=
tely argue that the control plane could install the interpretation locally =
on a per SFP basis;&nbsp; also being explicit on
 the wire will likely enhance interoperability and debuggability.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; The v=
alue would be locally significant within the administrative domain (i.e., m=
etadata schema 1, metatadata schema 2, etc.).&nbsp;&nbsp; Overloading lengt=
h is one way.&nbsp;&nbsp; Overloading MD-type is another.&nbsp;&nbsp; Alloc=
ating a nibble or byte within the 32 bytes
 (probably the first nibble or byte) is yet another.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; Ron<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; -----=
Original Message-----<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; From:=
 sfc [<a href=3D"mailto:sfc-bounces@ietf.org"><span style=3D"color:purple">=
mailto:sfc-bounces@ietf.org</span></a>] On Behalf Of Lucy yong<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Sent:=
 Tuesday, October 18, 2016 10:27 AM<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; To: J=
oel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.com"><span style=3D"co=
lor:purple">jmh@joelhalpern.com</span></a>&gt;;<span class=3D"apple-convert=
ed-space">&nbsp;</span><a href=3D"mailto:sfc@ietf.org"><span style=3D"color=
:purple">sfc@ietf.org</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Subje=
ct: Re: [sfc] metadata type 1 constraint<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Joel,=
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy,=
 while your two text proposals are not wrong, I do not see them as adding a=
ny clarity to the document.&nbsp; The sections are very short and clearly d=
efine only the syntax.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; [Lucy=
] True. However, for this document, readers expect Section 3 to describe NS=
H syntax and semantics. Section 3.1-3.3 do both. If section 3.4 and 3.5 jus=
t specify the syntax, from documenting perspective, it is important to expl=
icitly state
 the two text out.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; With =
regard to SF and MD-1 support, there is absolutely nothing that requires an=
 SF to support only one MD-1 structure.&nbsp; Rather, the control mechanism=
s will tell the SF how to extract the data it needs from the MD-1 header.<b=
r>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; [Lucy=
] This puts much uncertainty for a single SF on what to implement, which ca=
uses people's concern. IMO, if we don't have a way to address this challeng=
e here (you stated in interim meeting), pushing it to another place does no=
t solve/address
 it. For example,&nbsp; will the control mechanisms tell an SF how to extra=
ct the data it needs from the MD-1 header per a SFP, or per a SFC, or for a=
ll SFC packets, or per payload flow, or combination of them? This will sign=
ificantly impact SF implementation. The
 reason having MD type 1 is that is hardware friendly. Leaving these uncert=
ainty open, not sure if the reason still makes a sense.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Lucy<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; I bel=
ieve there is already text in the control plane requirements document that =
describes the need for this control functionality.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Yours=
,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; Joel<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; On 10=
/17/16 11:07 AM, Lucy yong wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Suggestions:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Section 3.4 should mention that this section only defines MD type 1<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
format. The semantics of MD Type 1 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
document. Thus, the use of MD type 1 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
document.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Section 3.5 should mention that this section only defines MEF type 2<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
format. The semantics of MD type 2 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
document. Thus, the use of MD type 2 is outside the scope of this<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
documents.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
IMO: these statements are important for the sections.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Joel, MD semantics is critical for SFs. More than one semantics of MD<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
type 1 MUST NOT be specified for a SF. This should be a requirement in<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
the SFC arch. as a result of NSH design's, but the architecture is<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
already published. Maybe control plane requirement is the place to<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
state this out as the result of SFC arch and NSH design.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Thanks, Lucy<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
-----Original Message----- From: sfc [<a href=3D"mailto:sfc-bounces@ietf.or=
g"><span style=3D"color:purple">mailto:sfc-bounces@ietf.org</span></a>] On<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Behalf Of Joel M. Halpern Sent: Sunday, October 16, 2016 8:39 PM To:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Lucy yong;<span class=3D"apple-converted-space">&nbsp;</span><a href=3D"mai=
lto:sfc@ietf.org"><span style=3D"color:purple">sfc@ietf.org</span></a><span=
 class=3D"apple-converted-space">&nbsp;</span>Subject: Re: [sfc] metadata t=
ype 1 constraint<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
A) I woud not want to state any such constraint in the NSH document,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
because B) In fact, the SFP ID is in every NSH header.&nbsp; So yes, there<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
is context if it is needed<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
It is true that MD-2 is more flexible than MD-1.&nbsp; I don't think anyone=
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
disagrees with that.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
Yours, Joel<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
On 10/16/16 3:25 PM, Lucy yong wrote:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; RFC7665 (SFC architecture) states&nbsp; &quot;This architecture allows =
an SF to<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; be part of multiple SFPs and SFCs.&quot;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; NSH just specifies MD type1 with a 16 bytes field, and&nbsp; NSH doc.<b=
r>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; states<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; 3.&nbsp; NSH provides a mechanism to carry shared metadata between<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; participating entities and service functions.&nbsp; The semantics of<br=
>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; the shared metadata is communicated via a control plane, which is<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; outside the scope of this document, to participating nodes.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; Comments: this mean: when an SF that is part of multiple SFCs and MD<br=
>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; type 1 is used in some of SFCs, these SFCs MUST have the same<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; metadata semantics.&nbsp; This is because that NSH does not convey SFC<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; identifier. For MD type 2, different SFCs may insert different list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; of TLVs and each TLV has a type and specified semantics along (the<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; TLVs will be specified in different doc.).<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; Should we state out this constraint in NSH doc.<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; Lucy<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt; _______________________________________________ sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<span class=3D"apple-converted-space">&nbsp;</span><a href=3D"mailto:sfc=
@ietf.org"><span style=3D"color:purple">sfc@ietf.org</span></a><span class=
=3D"apple-converted-space">&nbsp;</span><a href=3D"https://www.ietf.org/mai=
lman/listinfo/sfc"><span style=3D"color:purple">https://www.ietf.org/mailma=
n/listinfo/sfc</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;&=
gt;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt; =
_______________________________________________ sfc mailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
span class=3D"apple-converted-space">&nbsp;</span><a href=3D"mailto:sfc@iet=
f.org"><span style=3D"color:purple">sfc@ietf.org</span></a><span class=3D"a=
pple-converted-space">&nbsp;</span><a href=3D"https://www.ietf.org/mailman/=
listinfo/sfc"><span style=3D"color:purple">https://www.ietf.org/mailman/lis=
tinfo/sfc</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; &gt;<=
br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; _____=
__________________________________________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; sfc m=
ailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span><a href=3D"mailto:sfc@ietf.org=
"><span style=3D"color:purple">sfc@ietf.org</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span><a href=3D"https://www.ietf.or=
g/mailman/listinfo/sfc"><span style=3D"color:purple">https://www.ietf.org/m=
ailman/listinfo/sfc</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; _____=
__________________________________________<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp; sfc m=
ailing list<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span><a href=3D"mailto:sfc@ietf.org=
"><span style=3D"color:purple">sfc@ietf.org</span></a><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;&gt;&nbsp;&nbsp;&nbsp;<span =
class=3D"apple-converted-space">&nbsp;</span><a href=3D"https://www.ietf.or=
g/mailman/listinfo/sfc"><span style=3D"color:purple">https://www.ietf.org/m=
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ace">&nbsp;</span><a href=3D"mailto:sfc@ietf.org"><span style=3D"color:purp=
le">sfc@ietf.org</span></a><br>
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</div>
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</div>
</blockquote>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
</div>
</div>
</div>
</blockquote>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal">_______________________________________________<br>
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</div>
</blockquote>
</div>
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From: "Jim Guichard (jguichar)" <jguichar@cisco.com>
To: "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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To: Lucy yong <lucy.yong@huawei.com>, "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>, "Joel M. Halpern" <jmh@joelhalpern.com>, "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, Ron Parker <Ron_Parker@affirmednetworks.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] metadata type 1 constraint
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Date: Wed, 26 Oct 2016 12:37:51 +0000
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From: <mohamed.boucadair@orange.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, Lucy yong <lucy.yong@huawei.com>, "Joel M. Halpern" <jmh@joelhalpern.com>, "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>, Ron Parker <Ron_Parker@affirmednetworks.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] metadata type 1 constraint
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References: <2691CE0099834E4A9C5044EEC662BB9D572E17C7@dfweml501-mbb> <16dbb343-f630-9e02-2e30-71b9417a620b@joelhalpern.com> <2691CE0099834E4A9C5044EEC662BB9D572E19A9@dfweml501-mbb> <c2ecc85b-b972-07ab-2127-38152ccdf8e9@joelhalpern.com> <2691CE0099834E4A9C5044EEC662BB9D572E1FB3@dfweml501-mbb> <CDF2F015F4429F458815ED2A6C2B6B0B838F8DC8@MBX021-W3-CA-2.exch021.domain.local> <2691CE0099834E4A9C5044EEC662BB9D572E20CE@dfweml501-mbb> <26723B93-0511-46DA-8EC5-581E9AF88EB7@alcatel-lucent.com> <b9b7ab83-7656-68a0-7b1e-b7904529f572@joelhalpern.com> <2691CE0099834E4A9C5044EEC662BB9D572E2645@dfweml501-mbb> <787AE7BB302AE849A7480A190F8B933009D950C2@OPEXCLILMA3.corporate.adroot.infra.ftgroup> <2691CE0099834E4A9C5044EEC662BB9D572E2E44@dfweml501-mbb> <787AE7BB302AE849A7480A190F8B933009D95FC5@OPEXCLILMA3.corporate.adroot.infra.ftgroup> <2691CE0099834E4A9C5044EEC662BB9D572E33FF@dfweml501-mbb> <72181239-985C-4E78-8603-9D6B510BD097@cisco.com>
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From: <mohamed.boucadair@orange.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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Date: Wed, 26 Oct 2016 13:02:17 +0000
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Subject: Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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From: Ron Parker <Ron_Parker@affirmednetworks.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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Subject: Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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From: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: "Van De Velde, Gunter (Nokia - BE)" <gunter.van_de_velde@nokia.com>
Thread-Topic: [sfc] metadata type 1 constraint
Thread-Index: AdIn4xLyjD6K0BeCTVKJAwYgCy2h8QAVbtCAABw7gwAAFmfBAAAaeMAAAAFNfQAAAY+AgAAAsjiAABD2M4AAHftKgAABtfIAAF6x9IAAAMpcgAAUsrQAAJPcYIAAB750gAAOQ2GAAAXEsQoAMcg7AAANks6A
Date: Wed, 26 Oct 2016 16:52:01 +0000
Message-ID: <C3C9408D-6F21-4790-9DE7-91DB4751F430@cisco.com>
References: <2691CE0099834E4A9C5044EEC662BB9D572E17C7@dfweml501-mbb> <16dbb343-f630-9e02-2e30-71b9417a620b@joelhalpern.com> <2691CE0099834E4A9C5044EEC662BB9D572E19A9@dfweml501-mbb> <c2ecc85b-b972-07ab-2127-38152ccdf8e9@joelhalpern.com> <2691CE0099834E4A9C5044EEC662BB9D572E1FB3@dfweml501-mbb> <CDF2F015F4429F458815ED2A6C2B6B0B838F8DC8@MBX021-W3-CA-2.exch021.domain.local> <2691CE0099834E4A9C5044EEC662BB9D572E20CE@dfweml501-mbb> <26723B93-0511-46DA-8EC5-581E9AF88EB7@alcatel-lucent.com> <b9b7ab83-7656-68a0-7b1e-b7904529f572@joelhalpern.com> <72836835-1674-4A1F-9AD3-AB084436BE68@cisco.com> <F050A823-C902-493D-A660-C77003BBA610@alcatel-lucent.com> <3C278B10-6EAB-4007-83E3-1EBDBD104664@alcatel-lucent.com> <0btu0gjrd9wd4r1sgre215ff.1477053881498@email.android.com> <2691CE0099834E4A9C5044EEC662BB9D572E368A@dfweml501-mbb> <1D51A977-95C6-49D7-BE36-365DD95BDE51@cisco.com> <2691CE0099834E4A9C5044EEC662BB9D572E4FDA@dfweml501-mbb> <6C0BA72D-A102-4592-BEDB-2905DA8B49CB@alcatel-lucent.com> <6F0E435A-47EA-435F-AC3D-7262FEC4FEF3@cisco.com> <DB54CD74-FE70-4808-B4C7-5D53F69E9FA1@alcatel-lucent.com>
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Cc: "Paul Quinn \(paulq\)" <paulq@cisco.com>, Lucy yong <lucy.yong@huawei.com>, "sfc@ietf.org" <sfc@ietf.org>
Subject: Re: [sfc] metadata type 1 constraint
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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Wed, 26 Oct 2016 11:56:02 -0500
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Subject: Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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Jim,

I support this addition. If an SF receives an SFC packet but doesn=E2=80=99=
t have
the necessary data extraction schema, how can it properly process the
packet?

You also asked whether the packet should be forwarded or dropped at this
point. Presumably the chain has been established in a particular order so
that the SFs can process the packet in a waterfall process. If one of the
SFs cannot process the packet properly, then the waterfall process has been
broken, and the packet really should be dropped, since the subsequent SFs
in the chain may not have the proper state in place to process the packet,
even if they have the schema.

Cheers,
Andy


On Wed, Oct 26, 2016 at 7:28 AM, Jim Guichard (jguichar) <jguichar@cisco.co=
m
> wrote:

> Dear SFC WG:
>
> The following text has been proposed by Med and Lucy as an addition to
> section 3.4 of draft-ietf-sfc-nsh:
>
> "This specification allows defining different semantics of metadata type =
1
> related mandatory context header, but the NSH header does not convey that
> semantic in the context headers. An SFC-aware SF MUST receive the data
> extraction schema first in order to get the data placed in the mandatory
> context header. How an SFC-aware SF gets the data extraction schema for t=
he
> mandatory context header is outside the scope of this specification. This
> specification does not make any assumption about the content placed in th=
e
> mandatory context header. Upon receiving an SFC packet with metadata type=
 1
> present, if an SFC-aware SF is configured to use metadata but does not ye=
t
> receive the data extraction schema for the mandatory context header, it
> MUST NOT process the packet and MUST log this error."
>
> Before asking the editors of the document to make this change, I would
> like to hear opinions from other WG members so that consensus for this
> change may be reached. I would particularly like to hear opinions on the
> last sentence; specifically the =E2=80=98MUST NOT process=E2=80=99 as thi=
s implies that an
> SF must drop a packet if it is unable to process the metadata thereby
> breaking the chain. Do we need to be this strict or can we simply log an
> error and forward the packet through the chain?
>
> Jim
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
>
>

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<div dir=3D"ltr">Jim,<div><br></div><div>I support this addition. If an SF =
receives an SFC packet but doesn=E2=80=99t have the necessary data extracti=
on schema, how can it properly process the packet?</div><div><br></div><div=
>You also asked whether the packet should be forwarded or dropped at this p=
oint. Presumably the chain has been established in a particular order so th=
at the SFs can process the packet in a waterfall process. If one of the SFs=
 cannot process the packet properly, then the waterfall process has been br=
oken, and the packet really should be dropped, since the subsequent SFs in =
the chain may not have the proper state in place to process the packet, eve=
n if they have the schema.</div><div><br></div><div>Cheers,</div><div>Andy<=
/div><div><br></div></div><div class=3D"gmail_extra"><br><div class=3D"gmai=
l_quote">On Wed, Oct 26, 2016 at 7:28 AM, Jim Guichard (jguichar) <span dir=
=3D"ltr">&lt;<a href=3D"mailto:jguichar@cisco.com" target=3D"_blank">jguich=
ar@cisco.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">



<div style=3D"word-wrap:break-word;color:rgb(0,0,0);font-size:14px;font-fam=
ily:Calibri,sans-serif">
<div>
<div>Dear SFC WG:</div>
<div><br>
</div>
<div>The following text has been proposed by Med and Lucy as an addition to=
 section 3.4 of draft-ietf-sfc-nsh:</div>
<div><br>
</div>
<div>
<div style=3D"font-family:-webkit-standard">&quot;This specification allows=
 defining different semantics of metadata type 1 related mandatory context =
header, but the NSH header does not convey that semantic in the context hea=
ders. An SFC-aware SF MUST receive the
 data extraction schema first in order to get the data placed in the mandat=
ory context header. How an SFC-aware SF gets the data extraction schema for=
 the mandatory context header is outside the scope of this specification. T=
his specification does not make
 any assumption about the content placed in the mandatory context header. U=
pon receiving an SFC packet with metadata type 1 present, if an SFC-aware S=
F is configured to use metadata but does not yet receive the data extractio=
n schema for the mandatory context
 header, it MUST NOT process the packet and MUST log this error.&quot;</div=
>
</div>
<div style=3D"font-family:-webkit-standard"><br>
</div>
<div style=3D"font-family:-webkit-standard">Before asking the editors of th=
e document to make this change, I would like to hear opinions from other WG=
 members so that consensus for this change may be reached. I would particul=
arly like to hear opinions on the
 last sentence; specifically the =E2=80=98MUST NOT process=E2=80=99 as this=
 implies that an SF must drop a packet if it is unable to process the metad=
ata thereby breaking the chain. Do we need to be this strict or can we simp=
ly log an error and forward the packet through the
 chain?</div><span class=3D"HOEnZb"><font color=3D"#888888">
<div style=3D"font-family:-webkit-standard"><br>
</div>
<div style=3D"font-family:-webkit-standard">Jim</div>
</font></span></div>
<div>
<div id=3D"m_-47789372968246587MAC_OUTLOOK_SIGNATURE"></div>
</div>
</div>

<br>______________________________<wbr>_________________<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" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/sfc</a><br>
<br></blockquote></div><br></div>

--001a113d73a43dd163053fc78183--


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Subject: Re: [sfc] #17 (architecture): Purge examples section to remove transports
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#17: Purge examples section to remove transports

Changes (by jguichar@cisco.com):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 Section 9 has been removed from the latest NSH document and therefore this
 ticket is resolved and should be closed.

-- 
--------------------------+------------------------------------------------
 Reporter:                |       Owner:  draft-ietf-sfc-nsh@tools.ietf.org
  smkumar@cisco.com       |      Status:  closed
     Type:  defect        |   Milestone:
 Priority:  major         |     Version:
Component:  architecture  |  Resolution:  fixed
 Severity:  Active WG     |
  Document                |
 Keywords:                |
--------------------------+------------------------------------------------

Ticket URL: <https://trac.tools.ietf.org/wg/sfc/trac/ticket/17#comment:1>
sfc <https://tools.ietf.org/sfc/>


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Subject: Re: [sfc] #11 (nsh): Mode bit for Metadata.
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#11: Mode bit for Metadata.

Changes (by jguichar@cisco.com):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 This ticket is old and does not reflect the latest NSH document.

-- 
--------------------------+------------------------------------------------
 Reporter:                |       Owner:  draft-ietf-sfc-nsh@tools.ietf.org
  sunilvk@f5.com          |      Status:  closed
     Type:  enhancement   |   Milestone:
 Priority:  major         |     Version:
Component:  nsh           |  Resolution:  fixed
 Severity:  -             |
 Keywords:                |
--------------------------+------------------------------------------------

Ticket URL: <https://trac.tools.ietf.org/wg/sfc/trac/ticket/11#comment:1>
sfc <https://tools.ietf.org/sfc/>


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Subject: Re: [sfc] #20 (architecture): Context Header size limit with MDType 1
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#20: Context Header size limit with MDType 1

Changes (by jguichar@cisco.com):

 * status:  new => closed
 * resolution:   => wontfix


Comment:

 This issue has been discussed many times on the SFC WG mailing list and
 there is no consensus for change to the base specification. While type-1
 has only 4 contexts, if more are needed then a type-2 may be used.

-- 
-----------------------------+-------------------------
 Reporter:  sunilvk@f5.com   |       Owner:  Paul Quinn
     Type:  defect           |      Status:  closed
 Priority:  major            |   Milestone:  milestone1
Component:  architecture     |     Version:  2.0
 Severity:  In WG Last Call  |  Resolution:  wontfix
 Keywords:  NSH              |
-----------------------------+-------------------------

Ticket URL: <https://trac.tools.ietf.org/wg/sfc/trac/ticket/20#comment:2>
sfc <https://tools.ietf.org/sfc/>


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From: "Jim Guichard (jguichar)" <jguichar@cisco.com>
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Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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Date: Wed, 26 Oct 2016 20:37:16 +0000 (UTC)
From: Sumandra Majee <smajee@yahoo.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>,  "sfc@ietf.org" <sfc@ietf.org>
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Subject: Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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------=_Part_1620453_1862505110.1477514236974
Content-Type: text/plain; charset=UTF-8
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Jim,
I agree with the text except the MUST NOT part.=C2=A0
There could be services for which these context don't carry any specific me=
aning, however the forwarding does matter. Why does that particular SF need=
s to know the schema

=20

    On Wednesday, October 26, 2016 5:28 AM, Jim Guichard (jguichar) <jguich=
ar@cisco.com> wrote:
=20

  Dear SFC WG:
The following text has been proposed by Med and Lucy as an addition to sect=
ion 3.4 of draft-ietf-sfc-nsh:
"This specification allows defining different semantics of metadata type 1 =
related mandatory context header, but the NSH header does not convey that s=
emantic in the context headers. An SFC-aware SF MUST receive the data extra=
ction schema first in order to get the data placed in the mandatory context=
 header. How an SFC-aware SF gets the data extraction schema for the mandat=
ory context header is outside the scope of this specification. This specifi=
cation does not make any assumption about the content placed in the mandato=
ry context header. Upon receiving an SFC packet with metadata type 1 presen=
t, if an SFC-aware SF is configured to use metadata but does not yet receiv=
e the data extraction schema for the mandatory context header, it MUST NOT =
process the packet and MUST log this error."
Before asking the editors of the document to make this change, I would like=
 to hear opinions from other WG members so that consensus for this change m=
ay be reached. I would particularly like to hear opinions on the last sente=
nce; specifically the =E2=80=98MUST NOT process=E2=80=99 as this implies th=
at an SF must drop a packet if it is unable to process the metadata thereby=
 breaking the chain. Do we need to be this strict or can we simply log an e=
rror and forward the packet through the chain?
Jim
_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.ietf.org/mailman/listinfo/sfc


  =20
------=_Part_1620453_1862505110.1477514236974
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<html><head></head><body><div style=3D"color:#000; background-color:#fff; f=
ont-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, =
sans-serif;font-size:16px"><div id=3D"yui_3_16_0_ym19_1_1476996702943_19942=
9" dir=3D"ltr"><span>Jim,</span></div><div id=3D"yui_3_16_0_ym19_1_14769967=
02943_199429" dir=3D"ltr"><span><br></span></div><div id=3D"yui_3_16_0_ym19=
_1_1476996702943_199429" dir=3D"ltr"><span id=3D"yui_3_16_0_ym19_1_14769967=
02943_201926">I agree with the text except the MUST NOT part.&nbsp;</span><=
/div><div id=3D"yui_3_16_0_ym19_1_1476996702943_199429" dir=3D"ltr"><br></d=
iv><div id=3D"yui_3_16_0_ym19_1_1476996702943_199429" dir=3D"ltr">There cou=
ld be services for which these context don't carry any specific meaning, ho=
wever the forwarding does matter. Why does that particular SF needs to know=
 the schema</div><div id=3D"yui_3_16_0_ym19_1_1476996702943_199429" dir=3D"=
ltr"><span><br></span></div><div id=3D"yui_3_16_0_ym19_1_1476996702943_1994=
29" dir=3D"ltr"><span><br></span></div> <div class=3D"qtdSeparateBR"><br><b=
r></div><div class=3D"yahoo_quoted" style=3D"display: block;"> <div style=
=3D"font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Gr=
ande, sans-serif; font-size: 16px;"> <div style=3D"font-family: HelveticaNe=
ue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size:=
 16px;"> <div dir=3D"ltr"><font size=3D"2" face=3D"Arial"> On Wednesday, Oc=
tober 26, 2016 5:28 AM, Jim Guichard (jguichar) &lt;jguichar@cisco.com&gt; =
wrote:<br></font></div>  <br><br> <div class=3D"y_msg_container"><div id=3D=
"yiv5729747655">

=20

<div>
<div>
<div>Dear SFC WG:</div>
<div><br>
</div>
<div>The following text has been proposed by Med and Lucy as an addition to=
 section 3.4 of draft-ietf-sfc-nsh:</div>
<div><br>
</div>
<div>
<div style=3D"font-family:-webkit-standard;">"This specification allows def=
ining different semantics of metadata type 1 related mandatory context head=
er, but the NSH header does not convey that semantic in the context headers=
. An SFC-aware SF MUST receive the
 data extraction schema first in order to get the data placed in the mandat=
ory context header. How an SFC-aware SF gets the data extraction schema for=
 the mandatory context header is outside the scope of this specification. T=
his specification does not make
 any assumption about the content placed in the mandatory context header. U=
pon receiving an SFC packet with metadata type 1 present, if an SFC-aware S=
F is configured to use metadata but does not yet receive the data extractio=
n schema for the mandatory context
 header, it MUST NOT process the packet and MUST log this error."</div>
</div>
<div style=3D"font-family:-webkit-standard;"><br>
</div>
<div style=3D"font-family:-webkit-standard;">Before asking the editors of t=
he document to make this change, I would like to hear opinions from other W=
G members so that consensus for this change may be reached. I would particu=
larly like to hear opinions on the
 last sentence; specifically the =E2=80=98MUST NOT process=E2=80=99 as this=
 implies that an SF must drop a packet if it is unable to process the metad=
ata thereby breaking the chain. Do we need to be this strict or can we simp=
ly log an error and forward the packet through the
 chain?</div>
<div style=3D"font-family:-webkit-standard;"><br>
</div>
<div style=3D"font-family:-webkit-standard;">Jim</div>
</div>
<div>
<div id=3D"yiv5729747655MAC_OUTLOOK_SIGNATURE"></div>
</div>
</div>

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From: Ron Parker <Ron_Parker@affirmednetworks.com>
To: Sumandra Majee <smajee@yahoo.com>, "Jim Guichard (jguichar)" <jguichar@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [GRAYMAIL] Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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From: Dave Dolson <ddolson@sandvine.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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From: "Jim Guichard (jguichar)" <jguichar@cisco.com>
To: Sumandra Majee <smajee@yahoo.com>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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Date: Wed, 26 Oct 2016 21:41:11 +0000
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Subject: Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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Hi Sumandra,

I was pondering the same thing until Med pointed out that the beginning of =
the sentence says "if an SFC-aware SF is configured to use metadata but doe=
s not yet receive the data extraction schema..." so presumably the MUST NOT=
 is dependent upon that and therefore an SF that does not care about the me=
tadata would forward the packet.

Jim

Sent from my iPhone

On Oct 26, 2016, at 4:46 PM, Sumandra Majee <smajee@yahoo.com<mailto:smajee=
@yahoo.com>> wrote:

Jim,

I agree with the text except the MUST NOT part.

There could be services for which these context don't carry any specific me=
aning, however the forwarding does matter. Why does that particular SF need=
s to know the schema




On Wednesday, October 26, 2016 5:28 AM, Jim Guichard (jguichar) <jguichar@c=
isco.com<mailto:jguichar@cisco.com>> wrote:


Dear SFC WG:

The following text has been proposed by Med and Lucy as an addition to sect=
ion 3.4 of draft-ietf-sfc-nsh:

"This specification allows defining different semantics of metadata type 1 =
related mandatory context header, but the NSH header does not convey that s=
emantic in the context headers. An SFC-aware SF MUST receive the data extra=
ction schema first in order to get the data placed in the mandatory context=
 header. How an SFC-aware SF gets the data extraction schema for the mandat=
ory context header is outside the scope of this specification. This specifi=
cation does not make any assumption about the content placed in the mandato=
ry context header. Upon receiving an SFC packet with metadata type 1 presen=
t, if an SFC-aware SF is configured to use metadata but does not yet receiv=
e the data extraction schema for the mandatory context header, it MUST NOT =
process the packet and MUST log this error."

Before asking the editors of the document to make this change, I would like=
 to hear opinions from other WG members so that consensus for this change m=
ay be reached. I would particularly like to hear opinions on the last sente=
nce; specifically the 'MUST NOT process' as this implies that an SF must dr=
op a packet if it is unable to process the metadata thereby breaking the ch=
ain. Do we need to be this strict or can we simply log an error and forward=
 the packet through the chain?

Jim

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



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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
</head>
<body dir=3D"auto">
<div>
<div style=3D"direction: inherit;">Hi Sumandra,</div>
<div style=3D"direction: inherit;"><br>
</div>
<div style=3D"direction: inherit;">I was pondering the same thing until Med=
 pointed out that the beginning of the sentence says &quot;<span style=3D"b=
ackground-color: rgba(255, 255, 255, 0);">if an SFC-aware SF is configured =
to use metadata but does not yet receive
 the data extraction schema...&quot; so presumably the MUST NOT is dependen=
t upon that and therefore an SF that does not care about the metadata would=
 forward the packet.</span></div>
<div style=3D"direction: inherit;"><span style=3D"background-color: rgba(25=
5, 255, 255, 0);"><br>
</span></div>
<div style=3D"direction: inherit;"><span style=3D"background-color: rgba(25=
5, 255, 255, 0);">Jim</span></div>
<br>
Sent from my iPhone</div>
<div><br>
On Oct 26, 2016, at 4:46 PM, Sumandra Majee &lt;<a href=3D"mailto:smajee@ya=
hoo.com">smajee@yahoo.com</a>&gt; wrote:<br>
<br>
</div>
<blockquote type=3D"cite">
<div>
<div style=3D"color:#000; background-color:#fff; font-family:HelveticaNeue,=
 Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px=
">
<div id=3D"yui_3_16_0_ym19_1_1476996702943_199429" dir=3D"ltr"><span>Jim,</=
span></div>
<div id=3D"yui_3_16_0_ym19_1_1476996702943_199429" dir=3D"ltr"><span><br>
</span></div>
<div id=3D"yui_3_16_0_ym19_1_1476996702943_199429" dir=3D"ltr"><span id=3D"=
yui_3_16_0_ym19_1_1476996702943_201926">I agree with the text except the MU=
ST NOT part.&nbsp;</span></div>
<div id=3D"yui_3_16_0_ym19_1_1476996702943_199429" dir=3D"ltr"><br>
</div>
<div id=3D"yui_3_16_0_ym19_1_1476996702943_199429" dir=3D"ltr">There could =
be services for which these context don't carry any specific meaning, howev=
er the forwarding does matter. Why does that particular SF needs to know th=
e schema</div>
<div id=3D"yui_3_16_0_ym19_1_1476996702943_199429" dir=3D"ltr"><span><br>
</span></div>
<div id=3D"yui_3_16_0_ym19_1_1476996702943_199429" dir=3D"ltr"><span><br>
</span></div>
<div class=3D"qtdSeparateBR"><br>
<br>
</div>
<div class=3D"yahoo_quoted" style=3D"display: block;">
<div style=3D"font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial,=
 Lucida Grande, sans-serif; font-size: 16px;">
<div style=3D"font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial,=
 Lucida Grande, sans-serif; font-size: 16px;">
<div dir=3D"ltr"><font size=3D"2" face=3D"Arial">On Wednesday, October 26, =
2016 5:28 AM, Jim Guichard (jguichar) &lt;<a href=3D"mailto:jguichar@cisco.=
com">jguichar@cisco.com</a>&gt; wrote:<br>
</font></div>
<br>
<br>
<div class=3D"y_msg_container">
<div id=3D"yiv5729747655">
<div>
<div>
<div>Dear SFC WG:</div>
<div><br>
</div>
<div>The following text has been proposed by Med and Lucy as an addition to=
 section 3.4 of draft-ietf-sfc-nsh:</div>
<div><br>
</div>
<div>
<div style=3D"font-family:-webkit-standard;">&quot;This specification allow=
s defining different semantics of metadata type 1 related mandatory context=
 header, but the NSH header does not convey that semantic in the context he=
aders. An SFC-aware SF MUST receive the
 data extraction schema first in order to get the data placed in the mandat=
ory context header. How an SFC-aware SF gets the data extraction schema for=
 the mandatory context header is outside the scope of this specification. T=
his specification does not make
 any assumption about the content placed in the mandatory context header. U=
pon receiving an SFC packet with metadata type 1 present, if an SFC-aware S=
F is configured to use metadata but does not yet receive the data extractio=
n schema for the mandatory context
 header, it MUST NOT process the packet and MUST log this error.&quot;</div=
>
</div>
<div style=3D"font-family:-webkit-standard;"><br>
</div>
<div style=3D"font-family:-webkit-standard;">Before asking the editors of t=
he document to make this change, I would like to hear opinions from other W=
G members so that consensus for this change may be reached. I would particu=
larly like to hear opinions on the
 last sentence; specifically the &#8216;MUST NOT process&#8217; as this imp=
lies that an SF must drop a packet if it is unable to process the metadata =
thereby breaking the chain. Do we need to be this strict or can we simply l=
og an error and forward the packet through the
 chain?</div>
<div style=3D"font-family:-webkit-standard;"><br>
</div>
<div style=3D"font-family:-webkit-standard;">Jim</div>
</div>
<div>
<div id=3D"yiv5729747655MAC_OUTLOOK_SIGNATURE"></div>
</div>
</div>
</div>
<br>
_______________________________________________<br>
sfc mailing list<br>
<a ymailto=3D"mailto:sfc@ietf.org" href=3D"mailto:sfc@ietf.org">sfc@ietf.or=
g</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>
<br>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
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Date: Wed, 26 Oct 2016 16:53:42 -0500
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Subject: Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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Jim,

Yes, exactly, an SF that doesn=E2=80=99t care about the metadata would forw=
ard it.
See my earlier email about why an SFC-aware SF that is configured to use
metadata but does not yet have the proper schema must drop the packet.

Cheers,
Andy

On Wed, Oct 26, 2016 at 4:41 PM, Jim Guichard (jguichar) <jguichar@cisco.co=
m
> wrote:

> Hi Sumandra,
>
> I was pondering the same thing until Med pointed out that the beginning o=
f
> the sentence says "if an SFC-aware SF is configured to use metadata but
> does not yet receive the data extraction schema..." so presumably the MUS=
T
> NOT is dependent upon that and therefore an SF that does not care about t=
he
> metadata would forward the packet.
>
> Jim
>
> Sent from my iPhone
>
> On Oct 26, 2016, at 4:46 PM, Sumandra Majee <smajee@yahoo.com> wrote:
>
> Jim,
>
> I agree with the text except the MUST NOT part.
>
> There could be services for which these context don't carry any specific
> meaning, however the forwarding does matter. Why does that particular SF
> needs to know the schema
>
>
>
>
> On Wednesday, October 26, 2016 5:28 AM, Jim Guichard (jguichar) <
> jguichar@cisco.com> wrote:
>
>
> Dear SFC WG:
>
> The following text has been proposed by Med and Lucy as an addition to
> section 3.4 of draft-ietf-sfc-nsh:
>
> "This specification allows defining different semantics of metadata type =
1
> related mandatory context header, but the NSH header does not convey that
> semantic in the context headers. An SFC-aware SF MUST receive the data
> extraction schema first in order to get the data placed in the mandatory
> context header. How an SFC-aware SF gets the data extraction schema for t=
he
> mandatory context header is outside the scope of this specification. This
> specification does not make any assumption about the content placed in th=
e
> mandatory context header. Upon receiving an SFC packet with metadata type=
 1
> present, if an SFC-aware SF is configured to use metadata but does not ye=
t
> receive the data extraction schema for the mandatory context header, it
> MUST NOT process the packet and MUST log this error."
>
> Before asking the editors of the document to make this change, I would
> like to hear opinions from other WG members so that consensus for this
> change may be reached. I would particularly like to hear opinions on the
> last sentence; specifically the =E2=80=98MUST NOT process=E2=80=99 as thi=
s implies that an
> SF must drop a packet if it is unable to process the metadata thereby
> breaking the chain. Do we need to be this strict or can we simply log an
> error and forward the packet through the chain?
>
> Jim
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
>
>
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
>
>

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<div dir=3D"ltr">Jim,<div><br></div><div>Yes, exactly, an SF that doesn=E2=
=80=99t care about the metadata would forward it. See my earlier email abou=
t why an SFC-aware SF that is configured to use metadata but does not yet h=
ave the proper schema must drop the packet.</div><div><br></div><div>Cheers=
,</div><div>Andy</div><div class=3D"gmail_extra"><br><div class=3D"gmail_qu=
ote">On Wed, Oct 26, 2016 at 4:41 PM, Jim Guichard (jguichar) <span dir=3D"=
ltr">&lt;<a href=3D"mailto:jguichar@cisco.com" target=3D"_blank">jguichar@c=
isco.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">



<div dir=3D"auto">
<div>
<div style=3D"direction:inherit">Hi Sumandra,</div>
<div style=3D"direction:inherit"><br>
</div>
<div style=3D"direction:inherit">I was pondering the same thing until Med p=
ointed out that the beginning of the sentence says &quot;<span style=3D"bac=
kground-color:rgba(255,255,255,0)">if an SFC-aware SF is configured to use =
metadata but does not yet receive
 the data extraction schema...&quot; so presumably the MUST NOT is dependen=
t upon that and therefore an SF that does not care about the metadata would=
 forward the packet.</span></div>
<div style=3D"direction:inherit"><span style=3D"background-color:rgba(255,2=
55,255,0)"><br>
</span></div>
<div style=3D"direction:inherit"><span style=3D"background-color:rgba(255,2=
55,255,0)">Jim</span></div>
<br>
Sent from my iPhone</div><span class=3D"">
<div><br>
On Oct 26, 2016, at 4:46 PM, Sumandra Majee &lt;<a href=3D"mailto:smajee@ya=
hoo.com" target=3D"_blank">smajee@yahoo.com</a>&gt; wrote:<br>
<br>
</div>
</span><blockquote type=3D"cite">
<div>
<div style=3D"color:#000;background-color:#fff;font-family:HelveticaNeue,He=
lvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"><span=
 class=3D"">
<div id=3D"m_4133201718272585846yui_3_16_0_ym19_1_1476996702943_199429" dir=
=3D"ltr"><span>Jim,</span></div>
<div id=3D"m_4133201718272585846yui_3_16_0_ym19_1_1476996702943_199429" dir=
=3D"ltr"><span><br>
</span></div>
<div id=3D"m_4133201718272585846yui_3_16_0_ym19_1_1476996702943_199429" dir=
=3D"ltr"><span id=3D"m_4133201718272585846yui_3_16_0_ym19_1_1476996702943_2=
01926">I agree with the text except the MUST NOT part.=C2=A0</span></div>
<div id=3D"m_4133201718272585846yui_3_16_0_ym19_1_1476996702943_199429" dir=
=3D"ltr"><br>
</div>
<div id=3D"m_4133201718272585846yui_3_16_0_ym19_1_1476996702943_199429" dir=
=3D"ltr">There could be services for which these context don&#39;t carry an=
y specific meaning, however the forwarding does matter. Why does that parti=
cular SF needs to know the schema</div>
<div id=3D"m_4133201718272585846yui_3_16_0_ym19_1_1476996702943_199429" dir=
=3D"ltr"><span><br>
</span></div>
<div id=3D"m_4133201718272585846yui_3_16_0_ym19_1_1476996702943_199429" dir=
=3D"ltr"><span><br>
</span></div>
<div class=3D"m_4133201718272585846qtdSeparateBR"><br>
<br>
</div>
</span><div class=3D"m_4133201718272585846yahoo_quoted" style=3D"display:bl=
ock">
<div style=3D"font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Luci=
da Grande,sans-serif;font-size:16px">
<div style=3D"font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Luci=
da Grande,sans-serif;font-size:16px"><span class=3D"">
<div dir=3D"ltr"><font size=3D"2" face=3D"Arial">On Wednesday, October 26, =
2016 5:28 AM, Jim Guichard (jguichar) &lt;<a href=3D"mailto:jguichar@cisco.=
com" target=3D"_blank">jguichar@cisco.com</a>&gt; wrote:<br>
</font></div>
<br>
<br>
</span><div class=3D"m_4133201718272585846y_msg_container"><div><div class=
=3D"h5">
<div id=3D"m_4133201718272585846yiv5729747655">
<div>
<div>
<div>Dear SFC WG:</div>
<div><br>
</div>
<div>The following text has been proposed by Med and Lucy as an addition to=
 section 3.4 of draft-ietf-sfc-nsh:</div>
<div><br>
</div>
<div>
<div style=3D"font-family:-webkit-standard">&quot;This specification allows=
 defining different semantics of metadata type 1 related mandatory context =
header, but the NSH header does not convey that semantic in the context hea=
ders. An SFC-aware SF MUST receive the
 data extraction schema first in order to get the data placed in the mandat=
ory context header. How an SFC-aware SF gets the data extraction schema for=
 the mandatory context header is outside the scope of this specification. T=
his specification does not make
 any assumption about the content placed in the mandatory context header. U=
pon receiving an SFC packet with metadata type 1 present, if an SFC-aware S=
F is configured to use metadata but does not yet receive the data extractio=
n schema for the mandatory context
 header, it MUST NOT process the packet and MUST log this error.&quot;</div=
>
</div>
<div style=3D"font-family:-webkit-standard"><br>
</div>
<div style=3D"font-family:-webkit-standard">Before asking the editors of th=
e document to make this change, I would like to hear opinions from other WG=
 members so that consensus for this change may be reached. I would particul=
arly like to hear opinions on the
 last sentence; specifically the =E2=80=98MUST NOT process=E2=80=99 as this=
 implies that an SF must drop a packet if it is unable to process the metad=
ata thereby breaking the chain. Do we need to be this strict or can we simp=
ly log an error and forward the packet through the
 chain?</div>
<div style=3D"font-family:-webkit-standard"><br>
</div>
<div style=3D"font-family:-webkit-standard">Jim</div>
</div>
<div>
<div id=3D"m_4133201718272585846yiv5729747655MAC_OUTLOOK_SIGNATURE"></div>
</div>
</div>
</div>
<br></div></div><span class=3D"">
______________________________<wbr>_________________<br>
sfc mailing list<br>
<a href=3D"mailto:sfc@ietf.org" target=3D"_blank">sfc@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/sfc" target=3D"_blank">htt=
ps://www.ietf.org/mailman/<wbr>listinfo/sfc</a><br>
<br>
<br>
</span></div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>

<br>______________________________<wbr>_________________<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" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/sfc</a><br>
<br></blockquote></div><br></div></div>

--001a11355798cc37b3053fcba9ba--


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From: "Jim Guichard (jguichar)" <jguichar@cisco.com>
To: "Andrew G. Malis" <agmalis@gmail.com>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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References: <60820554-B07F-4F08-83BC-D7FB18C80896@cisco.com>, <CAA=duU3ZCT283B+QhPWORFmnT8Rp=tYOd_3pZXD9q-dsg_UDpQ@mail.gmail.com>
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Subject: Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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Hi Andy,

Well doesn't it depend upon whether or not the processing of the metadata h=
as an effect on a downstream SF? What if the failing SF is simply logging t=
he application identification whereas all other SFs in the chain don't care=
 about what application it is? Should the forwarding break or should an err=
or simply be logged so that the operator can fix the failing SF?

In other words there are critical and non-critical failures and putting a b=
lanket statement to drop packets if an SF cannot process the metadata seems=
 overkill.

Allowing this to be a local decision with indication of the desired behavio=
r provided by the control plane (who btw is the only one that has knowledge=
 of the whole path) seems more flexible.

Jim

Sent from my iPhone

On Oct 26, 2016, at 12:56 PM, Andrew G. Malis <agmalis@gmail.com<mailto:agm=
alis@gmail.com>> wrote:

Jim,

I support this addition. If an SF receives an SFC packet but doesn't have t=
he necessary data extraction schema, how can it properly process the packet=
?

You also asked whether the packet should be forwarded or dropped at this po=
int. Presumably the chain has been established in a particular order so tha=
t the SFs can process the packet in a waterfall process. If one of the SFs =
cannot process the packet properly, then the waterfall process has been bro=
ken, and the packet really should be dropped, since the subsequent SFs in t=
he chain may not have the proper state in place to process the packet, even=
 if they have the schema.

Cheers,
Andy


On Wed, Oct 26, 2016 at 7:28 AM, Jim Guichard (jguichar) <jguichar@cisco.co=
m<mailto:jguichar@cisco.com>> wrote:
Dear SFC WG:

The following text has been proposed by Med and Lucy as an addition to sect=
ion 3.4 of draft-ietf-sfc-nsh:

"This specification allows defining different semantics of metadata type 1 =
related mandatory context header, but the NSH header does not convey that s=
emantic in the context headers. An SFC-aware SF MUST receive the data extra=
ction schema first in order to get the data placed in the mandatory context=
 header. How an SFC-aware SF gets the data extraction schema for the mandat=
ory context header is outside the scope of this specification. This specifi=
cation does not make any assumption about the content placed in the mandato=
ry context header. Upon receiving an SFC packet with metadata type 1 presen=
t, if an SFC-aware SF is configured to use metadata but does not yet receiv=
e the data extraction schema for the mandatory context header, it MUST NOT =
process the packet and MUST log this error."

Before asking the editors of the document to make this change, I would like=
 to hear opinions from other WG members so that consensus for this change m=
ay be reached. I would particularly like to hear opinions on the last sente=
nce; specifically the 'MUST NOT process' as this implies that an SF must dr=
op a packet if it is unable to process the metadata thereby breaking the ch=
ain. Do we need to be this strict or can we simply log an error and forward=
 the packet through the chain?

Jim

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


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

--_000_D69C641C90414B4485FB38FF6427E416ciscocom_
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Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
</head>
<body dir=3D"auto">
<div>
<div style=3D"direction: inherit;">Hi Andy,</div>
<div style=3D"direction: inherit;"><br>
</div>
<div style=3D"direction: inherit;">Well doesn't it depend upon whether or n=
ot the processing of the metadata has an effect on a downstream SF? What if=
 the failing SF is simply logging the application identification whereas al=
l other SFs in the chain don't care
 about what application it is? Should the forwarding break or should an err=
or simply be logged so that the operator can fix the failing SF?</div>
<div style=3D"direction: inherit;"><br>
</div>
<div style=3D"direction: inherit;">In other words there are critical and no=
n-critical failures and putting a blanket statement to drop packets if an S=
F cannot process the metadata seems overkill.&nbsp;</div>
<div style=3D"direction: inherit;"><br>
</div>
<div style=3D"direction: inherit;">Allowing this to be a local decision wit=
h indication of the desired behavior provided by the control plane (who btw=
 is the only one that has knowledge of the whole path) seems more flexible.=
</div>
<div style=3D"direction: inherit;"><br>
</div>
<div style=3D"direction: inherit;">Jim</div>
<br>
Sent from my iPhone</div>
<div><br>
On Oct 26, 2016, at 12:56 PM, Andrew G. Malis &lt;<a href=3D"mailto:agmalis=
@gmail.com">agmalis@gmail.com</a>&gt; wrote:<br>
<br>
</div>
<blockquote type=3D"cite">
<div>
<div dir=3D"ltr">Jim,
<div><br>
</div>
<div>I support this addition. If an SF receives an SFC packet but doesn&#82=
17;t have the necessary data extraction schema, how can it properly process=
 the packet?</div>
<div><br>
</div>
<div>You also asked whether the packet should be forwarded or dropped at th=
is point. Presumably the chain has been established in a particular order s=
o that the SFs can process the packet in a waterfall process. If one of the=
 SFs cannot process the packet properly,
 then the waterfall process has been broken, and the packet really should b=
e dropped, since the subsequent SFs in the chain may not have the proper st=
ate in place to process the packet, even if they have the schema.</div>
<div><br>
</div>
<div>Cheers,</div>
<div>Andy</div>
<div><br>
</div>
</div>
<div class=3D"gmail_extra"><br>
<div class=3D"gmail_quote">On Wed, Oct 26, 2016 at 7:28 AM, Jim Guichard (j=
guichar)
<span dir=3D"ltr">&lt;<a href=3D"mailto:jguichar@cisco.com" target=3D"_blan=
k">jguichar@cisco.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
<div style=3D"word-wrap:break-word;color:rgb(0,0,0);font-size:14px;font-fam=
ily:Calibri,sans-serif">
<div>
<div>Dear SFC WG:</div>
<div><br>
</div>
<div>The following text has been proposed by Med and Lucy as an addition to=
 section 3.4 of draft-ietf-sfc-nsh:</div>
<div><br>
</div>
<div>
<div style=3D"font-family:-webkit-standard">&quot;This specification allows=
 defining different semantics of metadata type 1 related mandatory context =
header, but the NSH header does not convey that semantic in the context hea=
ders. An SFC-aware SF MUST receive the
 data extraction schema first in order to get the data placed in the mandat=
ory context header. How an SFC-aware SF gets the data extraction schema for=
 the mandatory context header is outside the scope of this specification. T=
his specification does not make
 any assumption about the content placed in the mandatory context header. U=
pon receiving an SFC packet with metadata type 1 present, if an SFC-aware S=
F is configured to use metadata but does not yet receive the data extractio=
n schema for the mandatory context
 header, it MUST NOT process the packet and MUST log this error.&quot;</div=
>
</div>
<div style=3D"font-family:-webkit-standard"><br>
</div>
<div style=3D"font-family:-webkit-standard">Before asking the editors of th=
e document to make this change, I would like to hear opinions from other WG=
 members so that consensus for this change may be reached. I would particul=
arly like to hear opinions on the
 last sentence; specifically the &#8216;MUST NOT process&#8217; as this imp=
lies that an SF must drop a packet if it is unable to process the metadata =
thereby breaking the chain. Do we need to be this strict or can we simply l=
og an error and forward the packet through the
 chain?</div>
<span class=3D"HOEnZb"><font color=3D"#888888">
<div style=3D"font-family:-webkit-standard"><br>
</div>
<div style=3D"font-family:-webkit-standard">Jim</div>
</font></span></div>
<div>
<div id=3D"m_-47789372968246587MAC_OUTLOOK_SIGNATURE"></div>
</div>
</div>
<br>
______________________________<wbr>_________________<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" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/sfc</a><br>
<br>
</blockquote>
</div>
<br>
</div>
</div>
</blockquote>
<blockquote type=3D"cite">
<div><span>_______________________________________________</span><br>
<span>sfc mailing list</span><br>
<span><a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a></span><br>
<span><a href=3D"https://www.ietf.org/mailman/listinfo/sfc">https://www.iet=
f.org/mailman/listinfo/sfc</a></span><br>
</div>
</blockquote>
</body>
</html>

--_000_D69C641C90414B4485FB38FF6427E416ciscocom_--


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From: Lucy yong <lucy.yong@huawei.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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From: "Roberta Maglione (robmgl)" <robmgl@cisco.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, Sumandra Majee <smajee@yahoo.com>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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Subject: Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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Hello Jim, Sumandra
> so presumably the MUST NOT is dependent upon that and therefore an SF tha=
t does not care about the metadata would forward the packet.

If this is the intended meaning, in my opinion it would be useful to add a =
sentence to clarify/say that.=20

Thanks
Roberta =20


From: sfc [mailto:sfc-bounces@ietf.org] On Behalf Of Jim Guichard (jguichar=
)
Sent: Wednesday, October 26, 2016 11:41 PM
To: Sumandra Majee <smajee@yahoo.com>
Cc: sfc@ietf.org
Subject: Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-s=
fc-nsh-10

Hi Sumandra,

I was pondering the same thing until Med pointed out that the beginning of =
the sentence says "if an SFC-aware SF is configured to use metadata but doe=
s not yet receive the data extraction schema..." so presumably the MUST NOT=
 is dependent upon that and therefore an SF that does not care about the me=
tadata would forward the packet.


Jim

Sent from my iPhone

On Oct 26, 2016, at 4:46 PM, Sumandra Majee <mailto:smajee@yahoo.com> wrote=
:
Jim,

I agree with the text except the MUST NOT part.=A0

There could be services for which these context don't carry any specific me=
aning, however the forwarding does matter. Why does that particular SF need=
s to know the schema



On Wednesday, October 26, 2016 5:28 AM, Jim Guichard (jguichar) <mailto:jgu=
ichar@cisco.com> wrote:

Dear SFC WG:

The following text has been proposed by Med and Lucy as an addition to sect=
ion 3.4 of draft-ietf-sfc-nsh:

"This specification allows defining different semantics of metadata type 1 =
related mandatory context header, but the NSH header does not convey that s=
emantic in the context headers. An SFC-aware SF MUST receive the data extra=
ction schema first in order to get the data placed in the mandatory context=
 header. How an SFC-aware SF gets the data extraction schema for the mandat=
ory context header is outside the scope of this specification. This specifi=
cation does not make any assumption about the content placed in the mandato=
ry context header. Upon receiving an SFC packet with metadata type 1 presen=
t, if an SFC-aware SF is configured to use metadata but does not yet receiv=
e the data extraction schema for the mandatory context header, it MUST NOT =
process the packet and MUST log this error."

Before asking the editors of the document to make this change, I would like=
 to hear opinions from other WG members so that consensus for this change m=
ay be reached. I would particularly like to hear opinions on the last sente=
nce; specifically the 'MUST NOT process' as this implies that an SF must dr=
op a packet if it is unable to process the metadata thereby breaking the ch=
ain. Do we need to be this strict or can we simply log an error and forward=
 the packet through the chain?

Jim

_______________________________________________
sfc mailing list
mailto:sfc@ietf.org
https://www.ietf.org/mailman/listinfo/sfc


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To: Lucy yong <lucy.yong@huawei.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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To: Dave Dolson <ddolson@sandvine.com>, "Jim Guichard (jguichar)" <jguichar@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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From: Sumandra Majee <S.Majee@F5.com>
To: "Andrew G. Malis" <agmalis@gmail.com>, "Jim Guichard (jguichar)" <jguichar@cisco.com>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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Subject: Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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--_000_2691CE0099834E4A9C5044EEC662BB9D572E5CCEdfweml501mbb_--



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Date: Thu, 27 Oct 2016 02:20:44 +0000 (UTC)
From: Sumandra Majee <smajee@yahoo.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>
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Subject: Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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Content-Type: text/plain; charset=UTF-8
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Ok, so if an SF is supposed to understand the metadata but don't have the s=
chema then drop. It really shouldn't happen in practice, it must be an ugly=
 design where it declares yep I have something for you but never delivers. =
However there could be conflicting schema (again really shouldn't happen).
Perhaps the wording should "if an SFC aware SF is configured to use metadat=
a but doesn't have a unique schema for metadata then it must drop ..."=20

    On Wednesday, October 26, 2016 2:41 PM, Jim Guichard (jguichar) <jguich=
ar@cisco.com> wrote:
=20

 Hi Sumandra,
I was pondering the same thing until Med pointed out that the beginning of =
the sentence says "if an SFC-aware SF is configured to use metadata but doe=
s not yet receive the data extraction schema..." so presumably the MUST NOT=
 is dependent upon that and therefore an SF that does not care about the me=
tadata would forward the packet.
Jim
Sent from my iPhone
On Oct 26, 2016, at 4:46 PM, Sumandra Majee <smajee@yahoo.com> wrote:


Jim,
I agree with the text except the MUST NOT part.=C2=A0
There could be services for which these context don't carry any specific me=
aning, however the forwarding does matter. Why does that particular SF need=
s to know the schema



On Wednesday, October 26, 2016 5:28 AM, Jim Guichard (jguichar) <jguichar@c=
isco.com> wrote:


Dear SFC WG:
The following text has been proposed by Med and Lucy as an addition to sect=
ion 3.4 of draft-ietf-sfc-nsh:
"This specification allows defining different semantics of metadata type 1 =
related mandatory context header, but the NSH header does not convey that s=
emantic in the context headers. An SFC-aware SF MUST receive the data extra=
ction schema first in order to get the data placed in the mandatory context=
 header. How an SFC-aware SF gets the data extraction schema for the mandat=
ory context header is outside the scope of this specification. This specifi=
cation does not make any assumption about the content placed in the mandato=
ry context header. Upon receiving an SFC packet with metadata type 1 presen=
t, if an SFC-aware SF is configured to use metadata but does not yet receiv=
e the data extraction schema for the mandatory context header, it MUST NOT =
process the packet and MUST log this error."
Before asking the editors of the document to make this change, I would like=
 to hear opinions from other WG members so that consensus for this change m=
ay be reached. I would particularly like to hear opinions on the last sente=
nce; specifically the =E2=80=98MUST NOT process=E2=80=99 as this implies th=
at an SF must drop a packet if it is unable to process the metadata thereby=
 breaking the chain. Do we need to be this strict or can we simply log an e=
rror and forward the packet through the chain?
Jim
_______________________________________________
sfc mailing list
sfc@ietf.org
https://www.ietf.org/mailman/listinfo/sfc





  =20
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Content-Type: text/html; charset=UTF-8
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<html><head></head><body><div style=3D"color:#000; background-color:#fff; f=
ont-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, =
sans-serif;font-size:16px"><div id=3D"yui_3_16_0_ym19_1_1476996702943_28106=
0"><span id=3D"yui_3_16_0_ym19_1_1476996702943_281059">Ok, so if an SF is s=
upposed to understand the metadata but don't have the schema then drop. It =
really shouldn't happen in practice, it must be an ugly design where it dec=
lares yep I have something for you but never delivers. However there could =
be conflicting schema (again really shouldn't happen).</span></div><div id=
=3D"yui_3_16_0_ym19_1_1476996702943_281060"><span><br></span></div><div id=
=3D"yui_3_16_0_ym19_1_1476996702943_281060">Perhaps the wording should "if =
an SFC aware SF is configured to use metadata but doesn't have a unique sch=
ema for metadata then it must drop ..."</div> <div class=3D"qtdSeparateBR">=
<br><br></div><div class=3D"yahoo_quoted" style=3D"display: block;"> <div s=
tyle=3D"font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucid=
a Grande, sans-serif; font-size: 16px;"> <div style=3D"font-family: Helveti=
caNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-s=
ize: 16px;"> <div dir=3D"ltr"><font size=3D"2" face=3D"Arial"> On Wednesday=
, October 26, 2016 2:41 PM, Jim Guichard (jguichar) &lt;jguichar@cisco.com&=
gt; wrote:<br></font></div>  <br><br> <div class=3D"y_msg_container"><div i=
d=3D"yiv8549853774"><div>
<div>
<div style=3D"direction:inherit;">Hi Sumandra,</div>
<div style=3D"direction:inherit;"><br clear=3D"none">
</div>
<div style=3D"direction:inherit;">I was pondering the same thing until Med =
pointed out that the beginning of the sentence says "<span style=3D"">if an=
 SFC-aware SF is configured to use metadata but does not yet receive
 the data extraction schema..." so presumably the MUST NOT is dependent upo=
n that and therefore an SF that does not care about the metadata would forw=
ard the packet.</span></div>
<div style=3D"direction:inherit;"><span style=3D""><br clear=3D"none">
</span></div>
<div style=3D"direction:inherit;"><span style=3D"">Jim</span></div>
<br clear=3D"none">
Sent from my iPhone</div>
<div class=3D"yiv8549853774yqt3466392895" id=3D"yiv8549853774yqt40738"><div=
><br clear=3D"none">
On Oct 26, 2016, at 4:46 PM, Sumandra Majee &lt;<a rel=3D"nofollow" shape=
=3D"rect" ymailto=3D"mailto:smajee@yahoo.com" target=3D"_blank" href=3D"mai=
lto:smajee@yahoo.com">smajee@yahoo.com</a>&gt; wrote:<br clear=3D"none">
<br clear=3D"none">
</div>
<blockquote type=3D"cite">
<div>
<div style=3D"color:#000;background-color:#fff;font-family:HelveticaNeue, H=
elvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"=
>
<div dir=3D"ltr" id=3D"yiv8549853774yui_3_16_0_ym19_1_1476996702943_199429"=
><span>Jim,</span></div>
<div dir=3D"ltr" id=3D"yiv8549853774yui_3_16_0_ym19_1_1476996702943_199429"=
><span><br clear=3D"none">
</span></div>
<div dir=3D"ltr" id=3D"yiv8549853774yui_3_16_0_ym19_1_1476996702943_199429"=
><span id=3D"yiv8549853774yui_3_16_0_ym19_1_1476996702943_201926">I agree w=
ith the text except the MUST NOT part.&nbsp;</span></div>
<div dir=3D"ltr" id=3D"yiv8549853774yui_3_16_0_ym19_1_1476996702943_199429"=
><br clear=3D"none">
</div>
<div dir=3D"ltr" id=3D"yiv8549853774yui_3_16_0_ym19_1_1476996702943_199429"=
>There could be services for which these context don't carry any specific m=
eaning, however the forwarding does matter. Why does that particular SF nee=
ds to know the schema</div>
<div dir=3D"ltr" id=3D"yiv8549853774yui_3_16_0_ym19_1_1476996702943_199429"=
><span><br clear=3D"none">
</span></div>
<div dir=3D"ltr" id=3D"yiv8549853774yui_3_16_0_ym19_1_1476996702943_199429"=
><span><br clear=3D"none">
</span></div>
<div class=3D"yiv8549853774qtdSeparateBR"><br clear=3D"none">
<br clear=3D"none">
</div>
<div class=3D"yiv8549853774yahoo_quoted" style=3D"display:block;">
<div style=3D"font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, =
Lucida Grande, sans-serif;font-size:16px;">
<div style=3D"font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, =
Lucida Grande, sans-serif;font-size:16px;">
<div dir=3D"ltr"><font size=3D"2" face=3D"Arial">On Wednesday, October 26, =
2016 5:28 AM, Jim Guichard (jguichar) &lt;<a rel=3D"nofollow" shape=3D"rect=
" ymailto=3D"mailto:jguichar@cisco.com" target=3D"_blank" href=3D"mailto:jg=
uichar@cisco.com">jguichar@cisco.com</a>&gt; wrote:<br clear=3D"none">
</font></div>
<br clear=3D"none">
<br clear=3D"none">
<div class=3D"yiv8549853774y_msg_container">
<div id=3D"yiv8549853774">
<div>
<div>
<div>Dear SFC WG:</div>
<div><br clear=3D"none">
</div>
<div>The following text has been proposed by Med and Lucy as an addition to=
 section 3.4 of draft-ietf-sfc-nsh:</div>
<div><br clear=3D"none">
</div>
<div>
<div style=3D"font-family:-webkit-standard;">"This specification allows def=
ining different semantics of metadata type 1 related mandatory context head=
er, but the NSH header does not convey that semantic in the context headers=
. An SFC-aware SF MUST receive the
 data extraction schema first in order to get the data placed in the mandat=
ory context header. How an SFC-aware SF gets the data extraction schema for=
 the mandatory context header is outside the scope of this specification. T=
his specification does not make
 any assumption about the content placed in the mandatory context header. U=
pon receiving an SFC packet with metadata type 1 present, if an SFC-aware S=
F is configured to use metadata but does not yet receive the data extractio=
n schema for the mandatory context
 header, it MUST NOT process the packet and MUST log this error."</div>
</div>
<div style=3D"font-family:-webkit-standard;"><br clear=3D"none">
</div>
<div style=3D"font-family:-webkit-standard;">Before asking the editors of t=
he document to make this change, I would like to hear opinions from other W=
G members so that consensus for this change may be reached. I would particu=
larly like to hear opinions on the
 last sentence; specifically the =E2=80=98MUST NOT process=E2=80=99 as this=
 implies that an SF must drop a packet if it is unable to process the metad=
ata thereby breaking the chain. Do we need to be this strict or can we simp=
ly log an error and forward the packet through the
 chain?</div>
<div style=3D"font-family:-webkit-standard;"><br clear=3D"none">
</div>
<div style=3D"font-family:-webkit-standard;">Jim</div>
</div>
<div>
<div id=3D"yiv8549853774MAC_OUTLOOK_SIGNATURE"></div>
</div>
</div>
</div>
<br clear=3D"none">
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</div>
</blockquote></div>
</div></div><br><br></div>  </div> </div>  </div></div></body></html>
------=_Part_1809929_1054142299.1477534844227--


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From: Nilanjan Sarkar <nsarkar@sandvine.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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Subject: Re: [sfc] #24 (nsh): -07 review (M. Boucadair)
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#24: -07 review (M. Boucadair)


Comment (by mohamed.boucadair@orange.com):

 Updating the tracker to record the pending points:

 ==
 (1) Section 2: I suggest to delete the following sentence:

     NSH is designed to be easy to implement across a range of devices,
     both physical and virtual, including hardware platforms.

  Reason: the use of "easy to implement" should be justified if that text
 is
  maintained. Otherwise, this is subjective.

  or to reword it as follows:

     "NSH can be implemented in both physical and virtual platforms."

  (2) Section 2.3: CLOSED

  (3) Section 2.3- Not sure I would maintain this text:

     5.  NSH offers a common and standards-based header for service
         chaining to all network and service nodes.

  "to all" is not accurate as "legacy" nodes are still there.

  (4) Section 2.3: CLOSED

  (5) Section 3.2:

     NSH implementations MUST support MD-Type = 0x1, and SHOULD support
     MD- Type = 0x2.

  Because:
  * of potential interoperability issues.
  * MD#2 is more compact when no metadata is to be supplied
  * MD#2 allows to convey more information compared to MD#1

  I suggest we revisit that sentence to have MD#2 be mandatory to be
  supported (my favorite option), or at least require that both MDs defined
  in this spec MUST be supported.

  (6) Section 3.2:

     C bit: Indicates that a critical metadata TLV is present.  This bit
     acts as an indication for hardware implementers to decide how to
     handle the presence of a critical TLV without necessarily needing to
     parse all TLVs present.  For an MD Type of 0x1 (i.e. no variable
     length metadata is present), the C bit MUST be set to 0x0.

  6.1. What is the behavior of the implementation if C-bit is set but not
  critical metadata is found in the payload?
  6.2. What is the behavior of the implementation if C-bit is unset but a
  critical metadata is found in the payload?
  6.3. What is the behavior of the implementation with regards to this bit
  if a critical metadata is added in-path?
  6.4. What is the behavior of the implementation with regards to this bit
  if a critical metadata is stripped in-path?
  6.5. Should the specification recommend an order of metadata so that
  critical metadata are always positioned first?

  (7) Section 3.3: CLOSED

  (8) Section 3.4:

  8.2. The specification does not forbid that all context headers are set
 to
  zero. Otherwise, MD#2 should be used instead.
  8.3. The specification does not specify how these context headers are to
  be validated.
  8.4. I still don't understand why four headers are chosen.

  (9) Section 3.5.1:

  The length of "Metadata Class" is over-dimensioned. I suggest to reduce
  the length of this field and increase the length of "Type".

  For example, let's consider the proposal in https://tools.ietf.org/html
  /draft-napper-sfc-nsh-broadband-allocation-00#section-4.2:

      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |     TLV Class = 3GPP          |C|    Type     |R|R|R|   Len   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |    Data ...
     +-+-+-+-+-+-+-+-+

                           Figure 5: TLV Allocation

     The intended use of the header is for TLVs associated with 3GPP Radio
     Access Networks as described in [TS.29.230].  This TLV can be used by
     3GPP to extend the metadata as per use cases.  Having this TLV helps
     to carry more information that does not fit within the MD Type 0x01.

  The list of codes in Table 7.1 of TS.29.230 cannot be conveyed with a
  "Type" field of 7 bits.

  (10) Section 4:

  OLD:

  +---------------+------------------+-------+----------------+---------+
   |                |  Insert         |Select |   Update       |Service  |
   |                |  or remove NSH  |Service|    NSH         |policy   |
   |                |                 |Function|               |selection|
   | Component      +--------+--------+Path   +----------------+         |
   |                |        |        |       | Dec.   |Update |         |
   |                | Insert | Remove |       |Service |Context|         |
   |                |        |        |       | Index  |Header |         |
   +----------------+--------+--------+-------+--------+-------+---------+
   |                |   +    |   +    |       |        |   +   |         |
   |Classifier      |        |        |       |        |       |         |
   +--------------- +--------+--------+-------+--------+-------+---------+
   |Service Function|        |   +    |  +    |        |       |         |
   |Forwarder(SFF)  |        |        |       |        |       |         |
   +--------------- +--------+--------+-------+--------+-------+---------+
   |Service         |        |        |       |   +    |   +   |   +     |
   |Function  (SF)  |        |        |       |        |       |         |
   +--------------- +--------+--------+-------+--------+-------+---------+
   |SFC Proxy       |   +    |   +    |       |   +    |       |         |
   +----------------+--------+--------+-------+--------+-------+---------+

  NEW:

  +---------------+------------------+-------+----------------+---------+
   |                |  Insert         |Select |   Update       |Service  |
   |                |  or remove NSH  |Service|    NSH         |policy   |
   |                |                 |Function|               |selection|
   | Component      +--------+--------+Path   +----------------+         |
   |                |        |        |       | Dec.   |Update |         |
   |                | Insert | Remove |       |Service |Context|         |
   |                |        |        |       | Index  |Header |         |
   +----------------+--------+--------+-------+--------+-------+---------+
   |                |   +    |   +    |       |        |   +   |         |
   |Classifier      |        |        |       |        |       |         |
   +--------------- +--------+--------+-------+--------+-------+---------+
   |Service Function|        |   +    |  +    |        |       |         |
   |Forwarder(SFF)  |        |        |       |        |       |         |
   +--------------- +--------+--------+-------+--------+-------+---------+
   |Service         |        |        |       |   +    |   +   |   +     |
   |Function  (SF)  |        |        |       |        |       |         |
   +--------------- +--------+--------+-------+--------+-------+---------+
   |SFC Proxy       |   +    |   +    |       |   +    |   +   |         |
   +----------------+--------+--------+-------+--------+-------+---------+

  (11) Section 7.2: CLOSED.

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |       Owner:  draft-ietf-sfc-
  mohamed.boucadair@orange.com       |  nsh@tools.ietf.org
     Type:  defect                   |      Status:  new
 Priority:  major                    |   Milestone:
Component:  nsh                      |     Version:
 Severity:  -                        |  Resolution:
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <https://trac.tools.ietf.org/wg/sfc/trac/ticket/24#comment:1>
sfc <https://tools.ietf.org/sfc/>


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Subject: Re: [sfc] #22 (nsh): MD-1 with 16-bytes datablock
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#22: MD-1 with 16-bytes datablock


Comment (by mohamed.boucadair@orange.com):

 Make the following change which an outcome of the discussion:
  https://www.ietf.org/mail-archive/web/sfc/current/msg05110.html

  ==
  OLD:

       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |Ver|O|C|R|R|R|R|R|R|   Length  |  MD type=0x1  | Next Protocol |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |          Service Path Identifer               | Service Index |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Mandatory Context Header                       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Mandatory Context Header                       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Mandatory Context Header                       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Mandatory Context Header                       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

  NEW:
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |Ver|O|C|R|R|R|R|R|R|   Length  |  MD type=0x1  | Next Protocol |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |          Service Path Identifer               | Service Index |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Fixed Length Context Header                    |
      |                                                               |
      |                                                               |
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |       Owner:  draft-ietf-sfc-
  mohamed.boucadair@orange.com       |  nsh@tools.ietf.org
     Type:  defect                   |      Status:  new
 Priority:  major                    |   Milestone:
Component:  nsh                      |     Version:
 Severity:  Active WG Document       |  Resolution:
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <https://trac.tools.ietf.org/wg/sfc/trac/ticket/22#comment:1>
sfc <https://tools.ietf.org/sfc/>


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From: Ron Parker <Ron_Parker@affirmednetworks.com>
To: Sumandra Majee <smajee@yahoo.com>, "Jim Guichard (jguichar)" <jguichar@cisco.com>
Thread-Topic: [GRAYMAIL] Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
Thread-Index: AQHSL9GwFfLtCHF0YESRlQ89t2DLf6C8ByYAgABAwxA=
Date: Thu, 27 Oct 2016 13:16:51 +0000
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References: <60820554-B07F-4F08-83BC-D7FB18C80896@cisco.com> <235650492.1620454.1477514236978@mail.yahoo.com> <6ACEA10D-E386-40C1-B2D2-BA38D1D88B69@cisco.com> <685015458.1809930.1477534844233@mail.yahoo.com>
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Subject: Re: [sfc] [GRAYMAIL] Re: Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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References: <60820554-B07F-4F08-83BC-D7FB18C80896@cisco.com> <CAA=duU3ZCT283B+QhPWORFmnT8Rp=tYOd_3pZXD9q-dsg_UDpQ@mail.gmail.com> <9291F7C7-E6C6-4A6B-A5FB-7E3A5096C112@f5.com>
From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Thu, 27 Oct 2016 10:53:53 -0500
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To: Sumandra Majee <S.Majee@f5.com>
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Cc: "Jim Guichard \(jguichar\)" <jguichar@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>
Subject: Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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Jim,

Yes, configurable per service works for me.

Cheers,
Andy

On Wed, Oct 26, 2016 at 6:15 PM, Sumandra Majee <S.Majee@f5.com> wrote:

> Andy,
>
>
>
> The metadata is a shared context between certain set of services, not all
> the services may care about this metadata. If the SF is doing pkt samplin=
g
> it may not care about any contextual metadata, but it definitely needs to
> understand the SPI and forwarding rule. Sometimes a service itself could =
be
> optional, a video optimizer may not process the video flow at all if it i=
s
> overloaded.
>
>
>
> It is a local decision and I think Dave=E2=80=99s suggestion of making it
> configurable per service will work fine.
>
>
>
> *From: *sfc <sfc-bounces@ietf.org> on behalf of "Andrew G. Malis" <
> agmalis@gmail.com>
> *Date: *Wednesday, October 26, 2016 at 9:56 AM
> *To: *"Jim Guichard (jguichar)" <jguichar@cisco.com>
> *Cc: *"sfc@ietf.org" <sfc@ietf.org>
> *Subject: *Re: [sfc] Proposed additional text for section 3.4 of
> draft-ietf-sfc-nsh-10
>
>
>
> Jim,
>
>
>
> I support this addition. If an SF receives an SFC packet but doesn=E2=80=
=99t have
> the necessary data extraction schema, how can it properly process the
> packet?
>
>
>
> You also asked whether the packet should be forwarded or dropped at this
> point. Presumably the chain has been established in a particular order so
> that the SFs can process the packet in a waterfall process. If one of the
> SFs cannot process the packet properly, then the waterfall process has be=
en
> broken, and the packet really should be dropped, since the subsequent SFs
> in the chain may not have the proper state in place to process the packet=
,
> even if they have the schema.
>
>
>
> Cheers,
>
> Andy
>
>
>
>
>
> On Wed, Oct 26, 2016 at 7:28 AM, Jim Guichard (jguichar) <
> jguichar@cisco.com> wrote:
>
> Dear SFC WG:
>
>
>
> The following text has been proposed by Med and Lucy as an addition to
> section 3.4 of draft-ietf-sfc-nsh:
>
>
>
> "This specification allows defining different semantics of metadata type =
1
> related mandatory context header, but the NSH header does not convey that
> semantic in the context headers. An SFC-aware SF MUST receive the data
> extraction schema first in order to get the data placed in the mandatory
> context header. How an SFC-aware SF gets the data extraction schema for t=
he
> mandatory context header is outside the scope of this specification. This
> specification does not make any assumption about the content placed in th=
e
> mandatory context header. Upon receiving an SFC packet with metadata type=
 1
> present, if an SFC-aware SF is configured to use metadata but does not ye=
t
> receive the data extraction schema for the mandatory context header, it
> MUST NOT process the packet and MUST log this error."
>
>
>
> Before asking the editors of the document to make this change, I would
> like to hear opinions from other WG members so that consensus for this
> change may be reached. I would particularly like to hear opinions on the
> last sentence; specifically the =E2=80=98MUST NOT process=E2=80=99 as thi=
s implies that an
> SF must drop a packet if it is unable to process the metadata thereby
> breaking the chain. Do we need to be this strict or can we simply log an
> error and forward the packet through the chain?
>
>
>
> Jim
>
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
>
>
>

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<div dir=3D"ltr">Jim,<div><br></div><div>Yes, configurable per service work=
s for me.</div><div><br></div><div>Cheers,</div><div>Andy</div></div><div c=
lass=3D"gmail_extra"><br><div class=3D"gmail_quote">On Wed, Oct 26, 2016 at=
 6:15 PM, Sumandra Majee <span dir=3D"ltr">&lt;<a href=3D"mailto:S.Majee@f5=
.com" target=3D"_blank">S.Majee@f5.com</a>&gt;</span> wrote:<br><blockquote=
 class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc soli=
d;padding-left:1ex">







<div bgcolor=3D"white" lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_528238176910081009WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri"=
>Andy,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri"=
><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri"=
>The metadata is a shared context between certain set of services, not all =
the services may care about this metadata. If the SF is doing pkt sampling =
it may not care about any contextual
 metadata, but it definitely needs to understand the SPI and forwarding rul=
e. Sometimes a service itself could be optional, a video optimizer may not =
process the video flow at all if it is overloaded.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri"=
><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri"=
>It is a local decision and I think Dave=E2=80=99s suggestion of making it =
configurable per service will work fine.
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:Calibri"=
><u></u>=C2=A0<u></u></span></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-family:Calibri;color:black">F=
rom: </span>
</b><span style=3D"font-family:Calibri;color:black">sfc &lt;<a href=3D"mail=
to:sfc-bounces@ietf.org" target=3D"_blank">sfc-bounces@ietf.org</a>&gt; on =
behalf of &quot;Andrew G. Malis&quot; &lt;<a href=3D"mailto:agmalis@gmail.c=
om" target=3D"_blank">agmalis@gmail.com</a>&gt;<br>
<b>Date: </b>Wednesday, October 26, 2016 at 9:56 AM<span class=3D""><br>
<b>To: </b>&quot;Jim Guichard (jguichar)&quot; &lt;<a href=3D"mailto:jguich=
ar@cisco.com" target=3D"_blank">jguichar@cisco.com</a>&gt;<br>
</span><b>Cc: </b>&quot;<a href=3D"mailto:sfc@ietf.org" target=3D"_blank">s=
fc@ietf.org</a>&quot; &lt;<a href=3D"mailto:sfc@ietf.org" target=3D"_blank"=
>sfc@ietf.org</a>&gt;<span class=3D""><br>
<b>Subject: </b>Re: [sfc] Proposed additional text for section 3.4 of draft=
-ietf-sfc-nsh-10<u></u><u></u></span></span></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal">Jim, <u></u><u></u></p><div><div class=3D"h5">
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I support this addition. If an SF receives an SFC pa=
cket but doesn=E2=80=99t have the necessary data extraction schema, how can=
 it properly process the packet?<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">You also asked whether the packet should be forwarde=
d or dropped at this point. Presumably the chain has been established in a =
particular order so that the SFs can process the packet in a waterfall proc=
ess. If one of the SFs cannot process
 the packet properly, then the waterfall process has been broken, and the p=
acket really should be dropped, since the subsequent SFs in the chain may n=
ot have the proper state in place to process the packet, even if they have =
the schema.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Cheers,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Andy<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div></div></div><div><div class=3D"h5">
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Wed, Oct 26, 2016 at 7:28 AM, Jim Guichard (jguic=
har) &lt;<a href=3D"mailto:jguichar@cisco.com" target=3D"_blank">jguichar@c=
isco.com</a>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri;=
color:black">Dear SFC WG:<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri;=
color:black"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri;=
color:black">The following text has been proposed by Med and Lucy as an add=
ition to section 3.4 of draft-ietf-sfc-nsh:<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Calibri;=
color:black"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;-w=
ebkit-standard&quot;,&quot;serif&quot;;color:black">&quot;This specificatio=
n allows defining different semantics of metadata type 1 related mandatory =
context header, but the NSH header does not convey that semantic
 in the context headers. An SFC-aware SF MUST receive the data extraction s=
chema first in order to get the data placed in the mandatory context header=
. How an SFC-aware SF gets the data extraction schema for the mandatory con=
text header is outside the scope
 of this specification. This specification does not make any assumption abo=
ut the content placed in the mandatory context header. Upon receiving an SF=
C packet with metadata type 1 present, if an SFC-aware SF is configured to =
use metadata but does not yet receive
 the data extraction schema for the mandatory context header, it MUST NOT p=
rocess the packet and MUST log this error.&quot;<u></u><u></u></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;-w=
ebkit-standard&quot;,&quot;serif&quot;;color:black"><u></u>=C2=A0<u></u></s=
pan></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;-w=
ebkit-standard&quot;,&quot;serif&quot;;color:black">Before asking the edito=
rs of the document to make this change, I would like to hear opinions from =
other WG members so that consensus for this change may be
 reached. I would particularly like to hear opinions on the last sentence; =
specifically the =E2=80=98MUST NOT process=E2=80=99 as this implies that an=
 SF must drop a packet if it is unable to process the metadata thereby brea=
king the chain. Do we need to be this strict or
 can we simply log an error and forward the packet through the chain?<u></u=
><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;-w=
ebkit-standard&quot;,&quot;serif&quot;;color:#888888"><u></u>=C2=A0<u></u><=
/span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;-w=
ebkit-standard&quot;,&quot;serif&quot;;color:#888888">Jim<u></u><u></u></sp=
an></p>
</div>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><br>
______________________________<wbr>_________________<br>
sfc mailing list<br>
<a href=3D"mailto:sfc@ietf.org" target=3D"_blank">sfc@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/sfc" target=3D"_blank">htt=
ps://www.ietf.org/mailman/<wbr>listinfo/sfc</a><u></u><u></u></p>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div></div></div>
</div>
</div>
</div>

</blockquote></div><br></div>

--e89a8f83a24ddddf73053fdac0a8--


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From: Ron Parker <Ron_Parker@affirmednetworks.com>
To: "Andrew G. Malis" <agmalis@gmail.com>, Sumandra Majee <S.Majee@f5.com>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Thu, 27 Oct 2016 10:58:03 -0500
Message-ID: <CAA=duU0PoAtVV6MCuVT1okt1mYyxWV26w_DG6XTGfMxcubf7iQ@mail.gmail.com>
To: Ron Parker <Ron_Parker@affirmednetworks.com>
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Cc: "Jim Guichard \(jguichar\)" <jguichar@cisco.com>, Sumandra Majee <S.Majee@f5.com>, "sfc@ietf.org" <sfc@ietf.org>
Subject: Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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--e89a8f83a24db687ec053fdacfe0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

Ron,

This was in the context of Jim=E2=80=99s email, so what was really meant wa=
s
=E2=80=9Cservice function=E2=80=9D.

Cheers,
Andy


On Thu, Oct 27, 2016 at 10:55 AM, Ron Parker <
Ron_Parker@affirmednetworks.com> wrote:

> Andy,
>
>
>
> Can you clarify what is meant by =E2=80=9Cservice=E2=80=9D?
>
>
>
> Thanks.
>
>
>
>    Ron
>
>
>
>
>
> *From:* sfc [mailto:sfc-bounces@ietf.org] *On Behalf Of *Andrew G. Malis
> *Sent:* Thursday, October 27, 2016 11:54 AM
> *To:* Sumandra Majee <S.Majee@f5.com>
> *Cc:* Jim Guichard (jguichar) <jguichar@cisco.com>; sfc@ietf.org
>
> *Subject:* Re: [sfc] Proposed additional text for section 3.4 of
> draft-ietf-sfc-nsh-10
>
>
>
> Jim,
>
>
>
> Yes, configurable per service works for me.
>
>
>
> Cheers,
>
> Andy
>
>
>
> On Wed, Oct 26, 2016 at 6:15 PM, Sumandra Majee <S.Majee@f5.com> wrote:
>
> Andy,
>
>
>
> The metadata is a shared context between certain set of services, not all
> the services may care about this metadata. If the SF is doing pkt samplin=
g
> it may not care about any contextual metadata, but it definitely needs to
> understand the SPI and forwarding rule. Sometimes a service itself could =
be
> optional, a video optimizer may not process the video flow at all if it i=
s
> overloaded.
>
>
>
> It is a local decision and I think Dave=E2=80=99s suggestion of making it
> configurable per service will work fine.
>
>
>
> *From: *sfc <sfc-bounces@ietf.org> on behalf of "Andrew G. Malis" <
> agmalis@gmail.com>
> *Date: *Wednesday, October 26, 2016 at 9:56 AM
> *To: *"Jim Guichard (jguichar)" <jguichar@cisco.com>
> *Cc: *"sfc@ietf.org" <sfc@ietf.org>
> *Subject: *Re: [sfc] Proposed additional text for section 3.4 of
> draft-ietf-sfc-nsh-10
>
>
>
> Jim,
>
>
>
> I support this addition. If an SF receives an SFC packet but doesn=E2=80=
=99t have
> the necessary data extraction schema, how can it properly process the
> packet?
>
>
>
> You also asked whether the packet should be forwarded or dropped at this
> point. Presumably the chain has been established in a particular order so
> that the SFs can process the packet in a waterfall process. If one of the
> SFs cannot process the packet properly, then the waterfall process has be=
en
> broken, and the packet really should be dropped, since the subsequent SFs
> in the chain may not have the proper state in place to process the packet=
,
> even if they have the schema.
>
>
>
> Cheers,
>
> Andy
>
>
>
>
>
> On Wed, Oct 26, 2016 at 7:28 AM, Jim Guichard (jguichar) <
> jguichar@cisco.com> wrote:
>
> Dear SFC WG:
>
>
>
> The following text has been proposed by Med and Lucy as an addition to
> section 3.4 of draft-ietf-sfc-nsh:
>
>
>
> "This specification allows defining different semantics of metadata type =
1
> related mandatory context header, but the NSH header does not convey that
> semantic in the context headers. An SFC-aware SF MUST receive the data
> extraction schema first in order to get the data placed in the mandatory
> context header. How an SFC-aware SF gets the data extraction schema for t=
he
> mandatory context header is outside the scope of this specification. This
> specification does not make any assumption about the content placed in th=
e
> mandatory context header. Upon receiving an SFC packet with metadata type=
 1
> present, if an SFC-aware SF is configured to use metadata but does not ye=
t
> receive the data extraction schema for the mandatory context header, it
> MUST NOT process the packet and MUST log this error."
>
>
>
> Before asking the editors of the document to make this change, I would
> like to hear opinions from other WG members so that consensus for this
> change may be reached. I would particularly like to hear opinions on the
> last sentence; specifically the =E2=80=98MUST NOT process=E2=80=99 as thi=
s implies that an
> SF must drop a packet if it is unable to process the metadata thereby
> breaking the chain. Do we need to be this strict or can we simply log an
> error and forward the packet through the chain?
>
>
>
> Jim
>
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
>
>
>
>
>

--e89a8f83a24db687ec053fdacfe0
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Ron,<div><br></div><div>This was in the context of Jim=E2=
=80=99s email, so what was really meant was =E2=80=9Cservice function=E2=80=
=9D.</div><div><br></div><div>Cheers,</div><div>Andy</div><div><br></div></=
div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Thu, Oct 2=
7, 2016 at 10:55 AM, Ron Parker <span dir=3D"ltr">&lt;<a href=3D"mailto:Ron=
_Parker@affirmednetworks.com" target=3D"_blank">Ron_Parker@affirmednetworks=
.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-6974995579920892086WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Andy,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Can you clarify what is meant by =E2=
=80=9Cservice=E2=80=9D?<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Thanks.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0 Ron<u></u><u></u></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><a name=3D"m_-6974995579920892086__MailEndCompose"><=
span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;c=
olor:#1f497d"><u></u>=C2=A0<u></u></span></a></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> sfc [mailto:<a href=3D"mailto:=
sfc-bounces@ietf.org" target=3D"_blank">sfc-bounces@ietf.org</a>]
<b>On Behalf Of </b>Andrew G. Malis<br>
<b>Sent:</b> Thursday, October 27, 2016 11:54 AM<br>
<b>To:</b> Sumandra Majee &lt;<a href=3D"mailto:S.Majee@f5.com" target=3D"_=
blank">S.Majee@f5.com</a>&gt;<br>
<b>Cc:</b> Jim Guichard (jguichar) &lt;<a href=3D"mailto:jguichar@cisco.com=
" target=3D"_blank">jguichar@cisco.com</a>&gt;; <a href=3D"mailto:sfc@ietf.=
org" target=3D"_blank">sfc@ietf.org</a></span></p><div><div class=3D"h5"><b=
r>
<b>Subject:</b> Re: [sfc] Proposed additional text for section 3.4 of draft=
-ietf-sfc-nsh-10<u></u><u></u></div></div><p></p><div><div class=3D"h5">
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">Jim,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Yes, configurable per service works for me.<u></u><u=
></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Cheers,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Andy<u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Wed, Oct 26, 2016 at 6:15 PM, Sumandra Majee &lt;=
<a href=3D"mailto:S.Majee@f5.com" target=3D"_blank">S.Majee@f5.com</a>&gt; =
wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">Andy,</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">The metadata is a shared context between certain se=
t of services, not all the services may care about this metadata.
 If the SF is doing pkt sampling it may not care about any contextual metad=
ata, but it definitely needs to understand the SPI and forwarding rule. Som=
etimes a service itself could be optional, a video optimizer may not proces=
s the video flow at all if it is
 overloaded. </span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">It is a local decision and I think Dave=E2=80=99s s=
uggestion of making it configurable per service will work fine.
</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0</span><u></u><u></u></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-family:&quot;Calibri&quot;,sa=
ns-serif;color:black">From:
</span></b><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:=
black">sfc &lt;<a href=3D"mailto:sfc-bounces@ietf.org" target=3D"_blank">sf=
c-bounces@ietf.org</a>&gt; on behalf of &quot;Andrew G. Malis&quot; &lt;<a =
href=3D"mailto:agmalis@gmail.com" target=3D"_blank">agmalis@gmail.com</a>&g=
t;<br>
<b>Date: </b>Wednesday, October 26, 2016 at 9:56 AM<br>
<b>To: </b>&quot;Jim Guichard (jguichar)&quot; &lt;<a href=3D"mailto:jguich=
ar@cisco.com" target=3D"_blank">jguichar@cisco.com</a>&gt;<br>
<b>Cc: </b>&quot;<a href=3D"mailto:sfc@ietf.org" target=3D"_blank">sfc@ietf=
.org</a>&quot; &lt;<a href=3D"mailto:sfc@ietf.org" target=3D"_blank">sfc@ie=
tf.org</a>&gt;<br>
<b>Subject: </b>Re: [sfc] Proposed additional text for section 3.4 of draft=
-ietf-sfc-nsh-10</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal">Jim,
<u></u><u></u></p>
<div>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">I support this addition. If an SF receives an SFC pa=
cket but doesn=E2=80=99t have the necessary data extraction schema, how can=
 it properly process the packet?<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">You also asked whether the packet should be forwarde=
d or dropped at this point. Presumably the chain has been established in a =
particular order so that the SFs can process the packet
 in a waterfall process. If one of the SFs cannot process the packet proper=
ly, then the waterfall process has been broken, and the packet really shoul=
d be dropped, since the subsequent SFs in the chain may not have the proper=
 state in place to process the packet,
 even if they have the schema.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Cheers,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Andy<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">On Wed, Oct 26, 2016 at 7:28 AM, Jim Guichard (jguic=
har) &lt;<a href=3D"mailto:jguichar@cisco.com" target=3D"_blank">jguichar@c=
isco.com</a>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:black">Dear SFC WG:</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:black">=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:black">The following text has been proposed by=
 Med and Lucy as an addition to section 3.4 of draft-ietf-sfc-nsh:</span><u=
></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:black">=C2=A0</span><u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;-w=
ebkit-standard&quot;,serif;color:black">&quot;This specification allows def=
ining different semantics of metadata type 1 related mandatory context
 header, but the NSH header does not convey that semantic in the context he=
aders. An SFC-aware SF MUST receive the data extraction schema first in ord=
er to get the data placed in the mandatory context header. How an SFC-aware=
 SF gets the data extraction schema
 for the mandatory context header is outside the scope of this specificatio=
n. This specification does not make any assumption about the content placed=
 in the mandatory context header. Upon receiving an SFC packet with metadat=
a type 1 present, if an SFC-aware
 SF is configured to use metadata but does not yet receive the data extract=
ion schema for the mandatory context header, it MUST NOT process the packet=
 and MUST log this error.&quot;</span><u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;-w=
ebkit-standard&quot;,serif;color:black">=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;-w=
ebkit-standard&quot;,serif;color:black">Before asking the editors of the do=
cument to make this change, I would like to hear opinions from
 other WG members so that consensus for this change may be reached. I would=
 particularly like to hear opinions on the last sentence; specifically the =
=E2=80=98MUST NOT process=E2=80=99 as this implies that an SF must drop a p=
acket if it is unable to process the metadata thereby
 breaking the chain. Do we need to be this strict or can we simply log an e=
rror and forward the packet through the chain?</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;-w=
ebkit-standard&quot;,serif;color:#888888">=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;-w=
ebkit-standard&quot;,serif;color:#888888">Jim</span><u></u><u></u></p>
</div>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><br>
______________________________<wbr>_________________<br>
sfc mailing list<br>
<a href=3D"mailto:sfc@ietf.org" target=3D"_blank">sfc@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/sfc" target=3D"_blank">htt=
ps://www.ietf.org/mailman/<wbr>listinfo/sfc</a><u></u><u></u></p>
</blockquote>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div></div></div>
</div>

</blockquote></div><br></div>

--e89a8f83a24db687ec053fdacfe0--


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From: Dave Dolson <ddolson@sandvine.com>
To: "hackathon@ietf.org" <hackathon@ietf.org>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: Hacking SFC in Seoul -- Service Function development kit
Thread-Index: AdIwe+d6bWsPulqdTGGjmwMponf48w==
Date: Thu, 27 Oct 2016 18:11:11 +0000
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Cc: Kyle Larose <klarose@sandvine.com>
Subject: [sfc] Hacking SFC in Seoul -- Service Function development kit
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--_000_E8355113905631478EFF04F5AA706E983113EED6wtlexchp2sandvi_
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Greetings,

Kyle and I wish to champion an SFC project at the Hackathon in Seoul, to wo=
rk on a C/C++ high-performance service function development kit based on DP=
DK.

We are intending to make it easier to develop NSH-enabled Service Functions=
 written in C/C++, or to insert existing functions into a service chain.

Within Sandvine's private cloud "Nubo" we will create and test a simple NFV=
 service function using the library we are developing.

Traffic will be sent to the service function by Sandvine's Traffic Steering=
 Engine (a classifier and SFF).

Skills that will help you:
- C/C++
- DPDK
- Ubuntu


Please let us know your interest!


David Dolson
Senior Software Architect, Sandvine Inc.


--_000_E8355113905631478EFF04F5AA706E983113EED6wtlexchp2sandvi_
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<p class=3D"MsoNormal">Greetings,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#262626">Kyle and I wish to cha=
mpion an SFC project at the Hackathon in Seoul, to work on a C/C&#43;&#43; =
high-performance service function development kit based on DPDK.</span><spa=
n style=3D"font-size:12.0pt;color:#262626"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#262626"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#262626">We are intending to ma=
ke it easier to develop NSH-enabled Service Functions written in C/C&#43;&#=
43;, or to insert existing functions into a service chain.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"color:#262626"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#262626">Within Sandvine's priv=
ate cloud &quot;Nubo&quot; we will create and test a simple NFV service fun=
ction using the library we are developing.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#262626"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#262626">Traffic will be sent t=
o the service function by Sandvine's Traffic Steering Engine (a classifier =
and SFF).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#262626"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#262626">Skills that will help =
you:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#262626">- C/C&#43;&#43;<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#262626">- DPDK<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#262626">- Ubuntu<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#262626"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal">Please let us know your interest!<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>

--_000_E8355113905631478EFF04F5AA706E983113EED6wtlexchp2sandvi_--


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Subject: Re: [sfc] #24 (nsh): -07 review (M. Boucadair)
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#24: -07 review (M. Boucadair)


Comment (by jguichar@cisco.com):

 Please review the email responses sent by Paul Quinn on 9/10/2016 that
 seem to address many of the below comments.



 Replying to [comment:1 mohamed.boucadair@â€¦]:
 > Updating the tracker to record the pending points:
 >
 > ==
 > (1) Section 2: I suggest to delete the following sentence:
 >
 >     NSH is designed to be easy to implement across a range of devices,
 >     both physical and virtual, including hardware platforms.
 >
 >  Reason: the use of "easy to implement" should be justified if that text
 is
 >  maintained. Otherwise, this is subjective.
 >
 >  or to reword it as follows:
 >
 >     "NSH can be implemented in both physical and virtual platforms."
 >
 >  (2) Section 2.3: CLOSED
 >
 >  (3) Section 2.3- Not sure I would maintain this text:
 >
 >     5.  NSH offers a common and standards-based header for service
 >         chaining to all network and service nodes.
 >
 >  "to all" is not accurate as "legacy" nodes are still there.
 >
 >  (4) Section 2.3: CLOSED
 >
 >  (5) Section 3.2:
 >
 >     NSH implementations MUST support MD-Type = 0x1, and SHOULD support
 >     MD- Type = 0x2.
 >
 >  Because:
 >  * of potential interoperability issues.
 >  * MD#2 is more compact when no metadata is to be supplied
 >  * MD#2 allows to convey more information compared to MD#1
 >
 >  I suggest we revisit that sentence to have MD#2 be mandatory to be
 >  supported (my favorite option), or at least require that both MDs
 defined
 >  in this spec MUST be supported.
 >
 >  (6) Section 3.2:
 >
 >     C bit: Indicates that a critical metadata TLV is present.  This bit
 >     acts as an indication for hardware implementers to decide how to
 >     handle the presence of a critical TLV without necessarily needing to
 >     parse all TLVs present.  For an MD Type of 0x1 (i.e. no variable
 >     length metadata is present), the C bit MUST be set to 0x0.
 >
 >  6.1. What is the behavior of the implementation if C-bit is set but not
 >  critical metadata is found in the payload?
 >  6.2. What is the behavior of the implementation if C-bit is unset but a
 >  critical metadata is found in the payload?
 >  6.3. What is the behavior of the implementation with regards to this
 bit
 >  if a critical metadata is added in-path?
 >  6.4. What is the behavior of the implementation with regards to this
 bit
 >  if a critical metadata is stripped in-path?
 >  6.5. Should the specification recommend an order of metadata so that
 >  critical metadata are always positioned first?
 >
 >  (7) Section 3.3: CLOSED
 >
 >  (8) Section 3.4:
 >
 >  8.2. The specification does not forbid that all context headers are set
 to
 >  zero. Otherwise, MD#2 should be used instead.
 >  8.3. The specification does not specify how these context headers are
 to
 >  be validated.
 >  8.4. I still don't understand why four headers are chosen.
 >
 >  (9) Section 3.5.1:
 >
 >  The length of "Metadata Class" is over-dimensioned. I suggest to reduce
 >  the length of this field and increase the length of "Type".
 >
 >  For example, let's consider the proposal in https://tools.ietf.org/html
 >  /draft-napper-sfc-nsh-broadband-allocation-00#section-4.2:
 >
 >      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 >     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 >     |     TLV Class = 3GPP          |C|    Type     |R|R|R|   Len   |
 >     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 >     |    Data ...
 >     +-+-+-+-+-+-+-+-+
 >
 >                           Figure 5: TLV Allocation
 >
 >     The intended use of the header is for TLVs associated with 3GPP
 Radio
 >     Access Networks as described in [TS.29.230].  This TLV can be used
 by
 >     3GPP to extend the metadata as per use cases.  Having this TLV helps
 >     to carry more information that does not fit within the MD Type 0x01.
 >
 >  The list of codes in Table 7.1 of TS.29.230 cannot be conveyed with a
 >  "Type" field of 7 bits.
 >
 >  (10) Section 4:
 >
 >  OLD:
 >
 >  +---------------+------------------+-------+----------------+---------+
 >   |                |  Insert         |Select |   Update       |Service
 |
 >   |                |  or remove NSH  |Service|    NSH         |policy
 |
 >   |                |                 |Function|
 |selection|
 >   | Component      +--------+--------+Path   +----------------+
 |
 >   |                |        |        |       | Dec.   |Update |
 |
 >   |                | Insert | Remove |       |Service |Context|
 |
 >   |                |        |        |       | Index  |Header |
 |
 >
 +----------------+--------+--------+-------+--------+-------+---------+
 >   |                |   +    |   +    |       |        |   +   |
 |
 >   |Classifier      |        |        |       |        |       |
 |
 >   +---------------
 +--------+--------+-------+--------+-------+---------+
 >   |Service Function|        |   +    |  +    |        |       |
 |
 >   |Forwarder(SFF)  |        |        |       |        |       |
 |
 >   +---------------
 +--------+--------+-------+--------+-------+---------+
 >   |Service         |        |        |       |   +    |   +   |   +
 |
 >   |Function  (SF)  |        |        |       |        |       |
 |
 >   +---------------
 +--------+--------+-------+--------+-------+---------+
 >   |SFC Proxy       |   +    |   +    |       |   +    |       |
 |
 >
 +----------------+--------+--------+-------+--------+-------+---------+
 >
 >  NEW:
 >
 >  +---------------+------------------+-------+----------------+---------+
 >   |                |  Insert         |Select |   Update       |Service
 |
 >   |                |  or remove NSH  |Service|    NSH         |policy
 |
 >   |                |                 |Function|
 |selection|
 >   | Component      +--------+--------+Path   +----------------+
 |
 >   |                |        |        |       | Dec.   |Update |
 |
 >   |                | Insert | Remove |       |Service |Context|
 |
 >   |                |        |        |       | Index  |Header |
 |
 >
 +----------------+--------+--------+-------+--------+-------+---------+
 >   |                |   +    |   +    |       |        |   +   |
 |
 >   |Classifier      |        |        |       |        |       |
 |
 >   +---------------
 +--------+--------+-------+--------+-------+---------+
 >   |Service Function|        |   +    |  +    |        |       |
 |
 >   |Forwarder(SFF)  |        |        |       |        |       |
 |
 >   +---------------
 +--------+--------+-------+--------+-------+---------+
 >   |Service         |        |        |       |   +    |   +   |   +
 |
 >   |Function  (SF)  |        |        |       |        |       |
 |
 >   +---------------
 +--------+--------+-------+--------+-------+---------+
 >   |SFC Proxy       |   +    |   +    |       |   +    |   +   |
 |
 >
 +----------------+--------+--------+-------+--------+-------+---------+
 >
 >  (11) Section 7.2: CLOSED.
 >
 >

-- 
-------------------------------------+-------------------------------------
 Reporter:                           |       Owner:  draft-ietf-sfc-
  mohamed.boucadair@orange.com       |  nsh@tools.ietf.org
     Type:  defect                   |      Status:  new
 Priority:  major                    |   Milestone:
Component:  nsh                      |     Version:
 Severity:  -                        |  Resolution:
 Keywords:                           |
-------------------------------------+-------------------------------------

Ticket URL: <https://trac.tools.ietf.org/wg/sfc/trac/ticket/24#comment:2>
sfc <https://tools.ietf.org/sfc/>


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From: "Jim Guichard (jguichar)" <jguichar@cisco.com>
To: Lucy yong <lucy.yong@huawei.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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From: <mohamed.boucadair@orange.com>
To: sfc issue tracker <trac+sfc@tools.ietf.org>, "draft-ietf-sfc-nsh@tools.ietf.org" <draft-ietf-sfc-nsh@tools.ietf.org>, "jguichar@cisco.com" <jguichar@cisco.com>
Thread-Topic: [sfc] #24 (nsh): -07 review (M. Boucadair)
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Date: Fri, 28 Oct 2016 09:20:14 +0000
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Subject: Re: [sfc] #24 (nsh): -07 review (M. Boucadair)
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From: <mohamed.boucadair@orange.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, Lucy yong <lucy.yong@huawei.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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Date: Fri, 28 Oct 2016 09:22:29 +0000
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Subject: Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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From nobody Fri Oct 28 04:55:38 2016
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From: "Browne, Rory" <rory.browne@intel.com>
To: "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: New Draft on KPI stamping
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Hi Folks

We have posted a new draft
https://tools.ietf.org/html/draft-browne-sfc-nsh-kpi-stamp-00

replacing
https://tools.ietf.org/html/draft-browne-sfc-nsh-timestamp-01


BR Rory
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From: "Jim Guichard (jguichar)" <jguichar@cisco.com>
To: "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] Call for Seoul SFC WG Agenda Topics
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Subject: Re: [sfc] Call for Seoul SFC WG Agenda Topics
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--_000_0ADC19709EDF44BC8E10A45EAEB934AAciscocom_
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Dear SFC WG:

This is a reminder to please send requests for agenda time to the chairs by=
 November 4th 9AM EST.

Please also indicate if there are specific topics that you would like to se=
e discussed during the face-to-face meeting.

Jim

Sent from my iPhone

On Oct 21, 2016, at 10:57 AM, Jim Guichard (jguichar) <jguichar@cisco.com<m=
ailto:jguichar@cisco.com>> wrote:

Greetings WG:

Our meeting in Seoul is fast approaching. As always the goal of the meeting=
 will be to make the best use of our limited face-to-face time. With that i=
n mind we welcome requests for agenda time.

As we build the meeting agenda our goal will be to select presentations tha=
t best further the work of the WG, and that generally means focusing on key=
 charter deliverables and topics with important open issues to resolve. Whe=
n making a 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 W=
G document or progress on its own merit
- Does the content have a good basis for one of the WG documents per the ch=
arter
- Should the document content be merged with one or more other documents, s=
o that a combined document could become a WG document

**Please send your request to the SFC chairs until November 4th, 9 am EST.*=
*

The request must include the name of the draft or topic to be presented, ti=
me for the presentation requested, and the presenter.

Thanks,

Jim, Thomas & Martin
_______________________________________________
sfc mailing list
sfc@ietf.org<mailto:sfc@ietf.org>
https://www.ietf.org/mailman/listinfo/sfc

--_000_0ADC19709EDF44BC8E10A45EAEB934AAciscocom_
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
</head>
<body dir=3D"auto">
<div>
<div style=3D"direction: inherit;">Dear SFC WG:</div>
<div style=3D"direction: inherit;"><br>
</div>
<div style=3D"direction: inherit;">This is a reminder to please send reques=
ts for agenda time to the chairs by November 4th 9AM EST.</div>
<div style=3D"direction: inherit;"><br>
</div>
<div style=3D"direction: inherit;">Please also indicate if there are specif=
ic topics that you would like to see discussed during the face-to-face meet=
ing.</div>
<div style=3D"direction: inherit;"><br>
</div>
<div style=3D"direction: inherit;">Jim</div>
<br>
Sent from my iPhone</div>
<div><br>
On Oct 21, 2016, at 10:57 AM, Jim Guichard (jguichar) &lt;<a href=3D"mailto=
:jguichar@cisco.com">jguichar@cisco.com</a>&gt; wrote:<br>
<br>
</div>
<blockquote type=3D"cite">
<div>
<div>
<div>
<div>
<div style=3D"font-family: -webkit-standard;">Greetings WG:</div>
<div style=3D"font-family: -webkit-standard;"><br>
</div>
<div style=3D"font-family: -webkit-standard;">Our meeting in Seoul is fast =
approaching. As always the goal of the meeting will be to make the best use=
 of our limited face-to-face time. With that in mind we welcome requests fo=
r agenda time.</div>
<div style=3D"font-family: -webkit-standard;"><br>
</div>
<div style=3D"font-family: -webkit-standard;">As we build the meeting agend=
a our goal will be to select presentations that best further the work of th=
e WG, and that generally means focusing on key charter deliverables and top=
ics with important open issues to
 resolve. When making a request please consider what you think the WG shoul=
d do with its content &#8211; for example:</div>
<div style=3D"font-family: -webkit-standard;"><br>
</div>
<div style=3D"font-family: -webkit-standard;">- Does the document have usef=
ul content that should be moved into another WG document or progress on its=
 own merit</div>
<div style=3D"font-family: -webkit-standard;">- Does the content have a goo=
d basis for one of the WG documents per the charter</div>
<div style=3D"font-family: -webkit-standard;">- Should the document content=
 be merged with one or more other documents, so that a combined document co=
uld become a WG document</div>
<div style=3D"font-family: -webkit-standard;"><br>
</div>
<div style=3D"font-family: -webkit-standard;">**Please send your request to=
 the SFC chairs until November 4th, 9 am EST.**</div>
<div style=3D"font-family: -webkit-standard;"><br>
</div>
<div style=3D"font-family: -webkit-standard;">The request must include the =
name of the draft or topic to be presented, time for the presentation reque=
sted, and the presenter.</div>
<div style=3D"font-family: -webkit-standard;"><br>
</div>
<div style=3D"font-family: -webkit-standard;">Thanks,</div>
<div style=3D"font-family: -webkit-standard;"><br>
</div>
<div style=3D"font-family: -webkit-standard;">Jim, Thomas &amp; Martin</div=
>
</div>
<div>
<div id=3D"MAC_OUTLOOK_SIGNATURE"></div>
</div>
</div>
</div>
</div>
</blockquote>
<blockquote type=3D"cite">
<div><span>_______________________________________________</span><br>
<span>sfc mailing list</span><br>
<span><a href=3D"mailto:sfc@ietf.org">sfc@ietf.org</a></span><br>
<span><a href=3D"https://www.ietf.org/mailman/listinfo/sfc">https://www.iet=
f.org/mailman/listinfo/sfc</a></span><br>
</div>
</blockquote>
</body>
</html>

--_000_0ADC19709EDF44BC8E10A45EAEB934AAciscocom_--


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From: Ron Parker <Ron_Parker@affirmednetworks.com>
To: "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>, "Jim Guichard (jguichar)" <jguichar@cisco.com>, Lucy yong <lucy.yong@huawei.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
Thread-Index: AQHSL73ZFEfZDTB/fEqxV2jZmpARWKC7vpgAgAAMhACAACY4gIABgTUAgACc74D//9Vk8A==
Date: Fri, 28 Oct 2016 13:55:01 +0000
Message-ID: <CDF2F015F4429F458815ED2A6C2B6B0B8390014E@MBX021-W3-CA-2.exch021.domain.local>
References: <60820554-B07F-4F08-83BC-D7FB18C80896@cisco.com> <E177AAA5-A896-459D-AC4D-516D5F0E053B@cisco.com> <2691CE0099834E4A9C5044EEC662BB9D572E5C05@dfweml501-mbb> <02868E40-28DA-45B9-A38B-C71A46EF13A8@cisco.com> <2691CE0099834E4A9C5044EEC662BB9D572E5CCE@dfweml501-mbb> <F4E25D37-F788-40F4-A070-F76AD9E9C2BC@cisco.com> <787AE7BB302AE849A7480A190F8B933009D9953E@OPEXCLILMA3.corporate.adroot.infra.ftgroup>
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Subject: Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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From nobody Fri Oct 28 07:32:04 2016
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From: Dave Dolson <ddolson@sandvine.com>
To: Ron Parker <Ron_Parker@affirmednetworks.com>, "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>, "Jim Guichard (jguichar)" <jguichar@cisco.com>, Lucy yong <lucy.yong@huawei.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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Date: Fri, 28 Oct 2016 14:31:55 +0000
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Subject: Re: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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From: Lucy yong <lucy.yong@huawei.com>
To: "Jim Guichard (jguichar)" <jguichar@cisco.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] Proposed additional text for section 3.4 of draft-ietf-sfc-nsh-10
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From: "Jim Guichard (jguichar)" <jguichar@cisco.com>
To: "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: Progressing of NSH metadata drafts
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From: Behcet Sarikaya <sarikaya2012@gmail.com>
Date: Fri, 28 Oct 2016 14:00:22 -0500
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Subject: Re: [sfc] Progressing of NSH metadata drafts
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Hi Jim,

I read the minutes. I was in the Interim.
Based on that, please see below:


On Fri, Oct 28, 2016 at 9:51 AM, Jim Guichard (jguichar)
<jguichar@cisco.com> wrote:
> Dear SFC WG:
>
>
> Thank you to those that were able to attend our recent interim meeting.
>
>
> One of the topics we investigated was how to progress drafts on metadata
> within the WG. As a WG we really need to make progress in this area.
>
>
> We had a lively discussion around both type-1 and type-2 metadata.
>

First of all Thomas Narten's list was incomplete.

>
> At the interim meeting we reached a general agreement that we should adopt
> some of the type-1 allocation documents (initially the DC and Mobility
> allocations) and work toward WG consensus on the formats. While there was
> discussion on whether these documents should be informational or standards
> track, we agreed to initially adopt them as informational and move to a
> different track if the WG decides that is appropriate in the future.
>

I don't see anything in the minutes to suggest this.

>
> We also reached a general agreement that we should call for the adoption of
> the type-2 TLV registry document (draft-quinn-sfc-nsh-tlv).
>

Ditto.
I could not see even a mention of draft-quinn-sfc-nsh-tlv in the minutes.
How could we have reached an agreement to adopt it?

According to the minutes, the registry is supposed to have semantic
information, this is what it says:

once we have a type-2 registry, refer to the type-2 registry for semantics.

In order to have semantics, we need separate draft or drafts that do
contain semantics for the TLV or MD type 1 or 2 defined.
draft-quinn-sfc-nsh-tlv does not satisfy this requirement.
BTW no offense to the draft authors.

>
> The chairs would like to emphasis that these agreements were preliminary as
> not all interested parties were in attendance at the interim meeting.
> Therefore, if there are objections or agreement to this path forward, please
> do indicate as such on the mailing list.

Please see above.


Regards,

Behcet
>  If there are no substantive
> objections, the chairs will send separate emails shortly to request adoption
> of these drafts. Please look out for them and indicate on the mailing list
> whether you support adoption, and if not, why.
>
>
> Jim
>
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
>


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From: "Jim Guichard (jguichar)" <jguichar@cisco.com>
To: Lucy yong <lucy.yong@huawei.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: Progressing of NSH metadata drafts
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Date: Fri, 28 Oct 2016 20:48:56 +0000
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From: "Jim Guichard (jguichar)" <jguichar@cisco.com>
To: Lucy yong <lucy.yong@huawei.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: Progressing of NSH metadata drafts
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Date: Fri, 28 Oct 2016 20:52:13 +0000
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From: Behcet Sarikaya <sarikaya2012@gmail.com>
Date: Fri, 28 Oct 2016 17:16:32 -0500
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Subject: [sfc] New Version Notification for draft-sarikaya-sfc-metadatat1t2-00.txt
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A new version of I-D, draft-sarikaya-sfc-metadatat1t2-00.txt
has been successfully submitted by Behcet Sarikaya and posted to the
IETF repository.

Name:           draft-sarikaya-sfc-metadatat1t2
Revision:       00
Title:          Service Function Chaining Metadata Type 1 and Type 2
Document date:  2016-10-28
Group:          Individual Submission
Pages:          8
URL:
https://www.ietf.org/internet-drafts/draft-sarikaya-sfc-metadatat1t2-00.txt
Status:
https://datatracker.ietf.org/doc/draft-sarikaya-sfc-metadatat1t2/
Htmlized:       https://tools.ietf.org/html/draft-sarikaya-sfc-metadatat1t2-00


Abstract:
   With the definition of service function chain data plane protocol
   there comes the need to define the context data needed in the service
   function chain use cases.  This document gives an account of all
   context data defined so far as Network Service Header metadata Type 1
   and Type 2 context headers.  Next, the document discusses the various
   options that can be taken in standardizing service function chain
   metadata.




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Subject: Re: [sfc] New Version Notification for draft-jing-sfc-flow-release-notify-01.txt
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--=_alternative 00137F2B4825805D_=
Content-Type: text/plain; charset="US-ASCII"

Dear All,

    A new deployment requirement about how to release the created states 
by the traffic along the SFP has proposed,
So here tries to submit a draft to disclose the backgroud of this 
requirement and proposes some possible solutions.
     https://datatracker.ietf.org/doc/draft-jing-sfc-flow-release-notify/ 
    Hope you take a look at it and comments are really welcome :)

    Thanks,

BRs,
Linda Wang






A new version of I-D, draft-jing-sfc-flow-release-notify-01.txt
has been successfully submitted by Cui Wang and posted to the
IETF repository.

Name:                            draft-jing-sfc-flow-release-notify
Revision:                01
Title:                           Flow Release Notify
Document date:           2016-10-30
Group:                           Individual Submission
Pages:                           8
URL:            
https://www.ietf.org/internet-drafts/draft-jing-sfc-flow-release-notify-01.txt

Status:         
https://datatracker.ietf.org/doc/draft-jing-sfc-flow-release-notify/
Htmlized:       
https://tools.ietf.org/html/draft-jing-sfc-flow-release-notify-01
Diff:           
https://www.ietf.org/rfcdiff?url2=draft-jing-sfc-flow-release-notify-01

Abstract:
   Service function chain is the definition of an ordered set of service
   functions.  After instantiated, the service function path is created
   and the classified traffic is steered through the corresponding
   service function path and then forwarded to the final destination.
   SFs and SFC Proxies do not know the termination of a service flow.
   This document describes a method to notify the SFs and SFC Proxies
   the termination of a service flow.

   When one service flow goes through the SFP, there may create some
   states in some SFs or SFC Proxies.  However, when the service flow
   terminates, the SFs and SFC Proxies are unaware of that and maintain
   the states as well.This document describes a method to notify the SFs
   and SFC Proxies the termination of a service flow and release the
   resources occupied by the flow.

  


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



--=_alternative 00137F2B4825805D_=
Content-Type: text/html; charset="US-ASCII"

<font size=3 face="Calibri">Dear All,</font>
<br>
<br><font size=3 face="Calibri">&nbsp; &nbsp; A new deployment requirement
about how to release the created states by the traffic along the SFP has
proposed,</font>
<br><font size=3 face="Calibri">So here tries to submit a draft to disclose
the backgroud of this requirement and proposes some possible solutions.</font>
<br><font size=3 face="Calibri">&nbsp; &nbsp; </font><tt><font size=2>&nbsp;</font></tt><a href="https://datatracker.ietf.org/doc/draft-jing-sfc-flow-release-notify/"><tt><font size=2>https://datatracker.ietf.org/doc/draft-jing-sfc-flow-release-notify/</font></tt></a><font size=3 face="Calibri">
</font>
<br><font size=3 face="Calibri">&nbsp; &nbsp; Hope you take a look at it
and comments are really welcome :)</font>
<br>
<br><font size=3 face="Calibri">&nbsp; &nbsp; Thanks,</font>
<br>
<br><font size=3 face="Calibri">BRs,</font>
<br><font size=3 face="Calibri">Linda Wang</font>
<br>
<br>
<br>
<br>
<br>
<br><tt><font size=2><br>
A new version of I-D, draft-jing-sfc-flow-release-notify-01.txt<br>
has been successfully submitted by Cui Wang and posted to the<br>
IETF repository.<br>
<br>
Name: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;draft-jing-sfc-flow-release-notify<br>
Revision: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
01<br>
Title: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Flow
Release Notify<br>
Document date: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; 2016-10-30<br>
Group: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Individual
Submission<br>
Pages: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;8<br>
URL: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</font></tt><a href="https://www.ietf.org/internet-drafts/draft-jing-sfc-flow-release-notify-01.txt"><tt><font size=2>https://www.ietf.org/internet-drafts/draft-jing-sfc-flow-release-notify-01.txt</font></tt></a><tt><font size=2><br>
Status: &nbsp; &nbsp; &nbsp; &nbsp; </font></tt><a href="https://datatracker.ietf.org/doc/draft-jing-sfc-flow-release-notify/"><tt><font size=2>https://datatracker.ietf.org/doc/draft-jing-sfc-flow-release-notify/</font></tt></a><tt><font size=2><br>
Htmlized: &nbsp; &nbsp; &nbsp; </font></tt><a href="https://tools.ietf.org/html/draft-jing-sfc-flow-release-notify-01"><tt><font size=2>https://tools.ietf.org/html/draft-jing-sfc-flow-release-notify-01</font></tt></a><tt><font size=2><br>
Diff: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </font></tt><a href="https://www.ietf.org/rfcdiff?url2=draft-jing-sfc-flow-release-notify-01"><tt><font size=2>https://www.ietf.org/rfcdiff?url2=draft-jing-sfc-flow-release-notify-01</font></tt></a><tt><font size=2><br>
<br>
Abstract:<br>
 &nbsp; Service function chain is the definition of an ordered set of service<br>
 &nbsp; functions. &nbsp;After instantiated, the service function path
is created<br>
 &nbsp; and the classified traffic is steered through the corresponding<br>
 &nbsp; service function path and then forwarded to the final destination.<br>
 &nbsp; SFs and SFC Proxies do not know the termination of a service flow.<br>
 &nbsp; This document describes a method to notify the SFs and SFC Proxies<br>
 &nbsp; the termination of a service flow.<br>
<br>
 &nbsp; When one service flow goes through the SFP, there may create some<br>
 &nbsp; states in some SFs or SFC Proxies. &nbsp;However, when the service
flow<br>
 &nbsp; terminates, the SFs and SFC Proxies are unaware of that and maintain<br>
 &nbsp; the states as well.This document describes a method to notify the
SFs<br>
 &nbsp; and SFC Proxies the termination of a service flow and release the<br>
 &nbsp; resources occupied by the flow.<br>
<br>
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &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 submission<br>
until the htmlized version and diff are available at tools.ietf.org.<br>
<br>
The IETF Secretariat<br>
<br>
</font></tt>
<br>
--=_alternative 00137F2B4825805D_=--


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Mon, 31 Oct 2016 20:01:45 -0700
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Subject: [sfc] Slot request
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Dear WG Chairs, et. al,
authors of draft-ooamdt-rtgwg-ooam-header and draft-ooamdt-rtgwg-demand-cc-cv
have updated these draft and would appreciate a presentation slot:

   - OAM Header for use in Overlay Networks   draft-ooamdt-rtgwg-ooam-header
     Greg Mirsky    10 min
   - On-demand Continuity Check (CC) and Connectivity Verification (CV) for
   Overlay Networks   draft-ooamdt-rtgwg-demand-cc-cv   Greg Mirsky     10
   min

It would be great if both presentations can be scheduled as one block.

Regards,
Greg

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<div dir=3D"ltr">Dear WG Chairs, et. al,<div><div style=3D"font-size:12.8px=
"><span style=3D"font-size:12.8px;line-height:0px"><span style=3D"font-size=
:13px">authors of=C2=A0</span></span><span style=3D"font-size:1em;line-heig=
ht:0pt">draft-ooamdt-rtgwg-ooam-<wbr>header and=C2=A0</span><span style=3D"=
font-size:1em;line-height:0pt">draft-ooamdt-rtgwg-demand-<wbr>cc-cv have up=
dated these draft and would appreciate a presentation slot:</span><br><ul><=
li><span style=3D"font-size:1em;line-height:0pt">OAM Header for use in Over=
lay Networks =C2=A0=C2=A0</span><span style=3D"font-size:13px;line-height:0=
px">draft-ooamdt-rtgwg-ooam-<wbr>header =C2=A0 Greg Mirsky =C2=A0 =C2=A010 =
min</span><br></li><li><span style=3D"font-size:13px;line-height:0px">On-de=
mand Continuity Check (CC) and Connectivity Verification (CV) for Overlay N=
etworks =C2=A0=C2=A0</span><span style=3D"font-size:13px;line-height:0px">d=
raft-ooamdt-rtgwg-demand-<wbr>cc-cv =C2=A0 Greg Mirsky =C2=A0 =C2=A0 10 min=
</span><br></li></ul><span style=3D"line-height:0px">It would be great if b=
oth presentations can be scheduled as one block.</span></div><div style=3D"=
font-size:12.8px"><span style=3D"line-height:0px"><br></span></div><div sty=
le=3D"font-size:12.8px"><span style=3D"line-height:0px">Regards,</span></di=
v><div style=3D"font-size:12.8px"><span style=3D"line-height:0px">Greg</spa=
n></div></div></div>

--001a114078767934e40540348bc2--


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From: "Eric Wang (ejwang)" <ejwang@cisco.com>
To: "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: New revisions for SFC network security use cases and NSH allocation
Thread-Index: AQHSNAI/ixKcnteGcE61QT4N87ecRQ==
Date: Tue, 1 Nov 2016 05:39:00 +0000
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Subject: [sfc] New revisions for SFC network security use cases and NSH allocation
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Hi folks,

We have submitted new revisions for two drafts:
draft-wang-sfc-ns-use-cases-02.txt
draft-wang-sfc-nsh-ns-allocation-01.txt

Appreciate all the comments so far, and we look forward to more discussions=
 on the list and live in Seoul.


A new version of I-D, draft-wang-sfc-ns-use-cases-02.txt
has been successfully submitted by Eric Wang and posted to the
IETF repository.

Name: draft-wang-sfc-ns-use-cases
Revision: 02
Title: Service Function Chaining Use Cases for Network Security
Document date: 2016-10-25
Group: Individual Submission
Pages: 20
URL:            https://www.ietf.org/internet-drafts/draft-wang-sfc-ns-use-=
cases-02.txt
Status:         https://datatracker.ietf.org/doc/draft-wang-sfc-ns-use-case=
s/
Htmlized:       https://tools.ietf.org/html/draft-wang-sfc-ns-use-cases-02
Diff:           https://www.ietf.org/rfcdiff?url2=3Ddraft-wang-sfc-ns-use-c=
ases-02

Abstract:
  Enterprise networks deploy a variety of security devices to protect
  the network, hosts and endpoints.  Network security devices, both
  hardware and virtual, operate at all OSI layers with scanning and
  analysis capabilities for application content.  Multiple specific
  devices are often deployed together for breadth and depth of defense.
  This document describes use cases of Service Function Chaining (SFC)
  when deploying network security devices in the manner described above
  and also puts forth requirements for their effective operation.


A new version of I-D, draft-wang-sfc-nsh-ns-allocation-01.txt
has been successfully submitted by Eric Wang and posted to the
IETF repository.

Name: draft-wang-sfc-nsh-ns-allocation
Revision: 01
Title: Network Service Header (NSH) Context Header Allocation (Network Secu=
rity)
Document date: 2016-10-25
Group: Individual Submission
Pages: 7
URL:            https://www.ietf.org/internet-drafts/draft-wang-sfc-nsh-ns-=
allocation-01.txt
Status:         https://datatracker.ietf.org/doc/draft-wang-sfc-nsh-ns-allo=
cation/
Htmlized:       https://tools.ietf.org/html/draft-wang-sfc-nsh-ns-allocatio=
n-01
Diff:           https://www.ietf.org/rfcdiff?url2=3Ddraft-wang-sfc-nsh-ns-a=
llocation-01

Abstract:
  This document provides a recommended default allocation of the
  mandatory fixed context headers for a Network Service Header (NSH)
  relevant to Service Function Chaining (SFC) for network security
  Service Functions.  NSH is defined in [I-D.ietf-sfc-nsh].  This
  allocation is intended to support the use cased described in
  [I-D.wang-sfc-ns-use-cases].


Cheers,
-Eric



--_000_8285592406FB40A2AA089F6D6C3B9DFCciscocom_
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<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;" class=3D"">
<div class=3D"">Hi folks,</div>
<div class=3D""><br class=3D"">
</div>
We have submitted new revisions for two drafts:
<div class=3D"">draft-wang-sfc-ns-use-cases-02.txt</div>
<div class=3D"">draft-wang-sfc-nsh-ns-allocation-01.txt</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Appreciate all the comments so far, and we look forward to =
more discussions on the list and live in Seoul.</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D""><br class=3D"">
</div>
<div class=3D"">A new version of I-D, draft-wang-sfc-ns-use-cases-02.txt<br=
 class=3D"">
has been successfully submitted by Eric Wang and posted to the<br class=3D"=
">
IETF repository.<br class=3D"">
<br class=3D"">
Name:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span><span=
 class=3D"Apple-tab-span" style=3D"white-space:pre"></span>draft-wang-sfc-n=
s-use-cases<br class=3D"">
Revision:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span>0=
2<br class=3D"">
Title:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span><spa=
n class=3D"Apple-tab-span" style=3D"white-space:pre"></span>Service Functio=
n Chaining Use Cases for Network Security<br class=3D"">
Document date:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </s=
pan>2016-10-25<br class=3D"">
Group:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span><spa=
n class=3D"Apple-tab-span" style=3D"white-space:pre"></span>Individual Subm=
ission<br class=3D"">
Pages:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span><spa=
n class=3D"Apple-tab-span" style=3D"white-space:pre"></span>20<br class=3D"=
">
URL: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a href=3D"https://www.ietf.o=
rg/internet-drafts/draft-wang-sfc-ns-use-cases-02.txt" class=3D"">https://w=
ww.ietf.org/internet-drafts/draft-wang-sfc-ns-use-cases-02.txt</a><br class=
=3D"">
Status: &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;https://datatracker.ietf.org/doc/d=
raft-wang-sfc-ns-use-cases/<br class=3D"">
Htmlized: &nbsp; &nbsp; &nbsp;&nbsp;https://tools.ietf.org/html/draft-wang-=
sfc-ns-use-cases-02<br class=3D"">
Diff: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;https://www.ietf.org/rfcdiff?=
url2=3Ddraft-wang-sfc-ns-use-cases-02<br class=3D"">
<br class=3D"">
Abstract:<br class=3D"">
&nbsp; Enterprise networks deploy a variety of security devices to protect<=
br class=3D"">
&nbsp; the network, hosts and endpoints. &nbsp;Network security devices, bo=
th<br class=3D"">
&nbsp; hardware and virtual, operate at all OSI layers with scanning and<br=
 class=3D"">
&nbsp; analysis capabilities for application content. &nbsp;Multiple specif=
ic<br class=3D"">
&nbsp; devices are often deployed together for breadth and depth of defense=
.<br class=3D"">
&nbsp; This document describes use cases of Service Function Chaining (SFC)=
<br class=3D"">
&nbsp; when deploying network security devices in the manner described abov=
e<br class=3D"">
&nbsp; and also puts forth requirements for their effective operation.<br c=
lass=3D"">
<br class=3D"">
<br class=3D"">
</div>
<div class=3D"">A new version of I-D, draft-wang-sfc-nsh-ns-allocation-01.t=
xt<br class=3D"">
has been successfully submitted by Eric Wang and posted to the<br class=3D"=
">
IETF repository.<br class=3D"">
<br class=3D"">
Name:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span><span=
 class=3D"Apple-tab-span" style=3D"white-space:pre"></span>draft-wang-sfc-n=
sh-ns-allocation<br class=3D"">
Revision:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span>0=
1<br class=3D"">
Title:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span><spa=
n class=3D"Apple-tab-span" style=3D"white-space:pre"></span>Network Service=
 Header (NSH) Context Header Allocation (Network Security)<br class=3D"">
Document date:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </s=
pan>2016-10-25<br class=3D"">
Group:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span><spa=
n class=3D"Apple-tab-span" style=3D"white-space:pre"></span>Individual Subm=
ission<br class=3D"">
Pages:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span><spa=
n class=3D"Apple-tab-span" style=3D"white-space:pre"></span>7<br class=3D""=
>
URL: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a href=3D"https://www.ietf.o=
rg/internet-drafts/draft-wang-sfc-nsh-ns-allocation-01.txt" class=3D"">http=
s://www.ietf.org/internet-drafts/draft-wang-sfc-nsh-ns-allocation-01.txt</a=
><br class=3D"">
Status: &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;https://datatracker.ietf.org/doc/d=
raft-wang-sfc-nsh-ns-allocation/<br class=3D"">
Htmlized: &nbsp; &nbsp; &nbsp;&nbsp;https://tools.ietf.org/html/draft-wang-=
sfc-nsh-ns-allocation-01<br class=3D"">
Diff: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;https://www.ietf.org/rfcdiff?=
url2=3Ddraft-wang-sfc-nsh-ns-allocation-01<br class=3D"">
<br class=3D"">
Abstract:<br class=3D"">
&nbsp; This document provides a recommended default allocation of the<br cl=
ass=3D"">
&nbsp; mandatory fixed context headers for a Network Service Header (NSH)<b=
r class=3D"">
&nbsp; relevant to Service Function Chaining (SFC) for network security<br =
class=3D"">
&nbsp; Service Functions. &nbsp;NSH is defined in [I-D.ietf-sfc-nsh]. &nbsp=
;This<br class=3D"">
&nbsp; allocation is intended to support the use cased described in<br clas=
s=3D"">
&nbsp; [I-D.wang-sfc-ns-use-cases].<br class=3D"">
<br class=3D"">
<br class=3D"">
Cheers,</div>
<div class=3D"">-Eric</div>
<br class=3D"">
<div class=3D"">
<div class=3D"">
<div class=3D""><br class=3D"">
</div>
</div>
</div>
</body>
</html>

--_000_8285592406FB40A2AA089F6D6C3B9DFCciscocom_--


From nobody Mon Oct 31 22:48:56 2016
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From: "Eric Wang (ejwang)" <ejwang@cisco.com>
To: "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: New Version Notification for draft-wang-sfc-receive-only-01.txt
Thread-Index: AQHSLw/ohNb5CzQpQE67beJPSjTxNw==
Date: Tue, 1 Nov 2016 05:48:50 +0000
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Cc: "Kent Leung \(kleung\)" <kleung@cisco.com>
Subject: [sfc] Fwd: New Version Notification for draft-wang-sfc-receive-only-01.txt
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--_000_EF11F8AB3EB044E5B2C97366C565C5ADciscocom_
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Hi folks,

Thanks for all the active discussions before and after the last revision wa=
s posted.  Please let us know your comments and we look forward to more dis=
cussions in the next WG meeting in Seoul.

Regards,
-Eric


Begin forwarded message:

From: <internet-drafts@ietf.org<mailto:internet-drafts@ietf.org>>
Subject: New Version Notification for draft-wang-sfc-receive-only-01.txt
Date: October 25, 2016 at 3:34:10 PM PDT
To: Eric Wang <ejwang@cisco.com<mailto:ejwang@cisco.com>>, Kent Leung <kleu=
ng@cisco.com<mailto:kleung@cisco.com>>


A new version of I-D, draft-wang-sfc-receive-only-01.txt
has been successfully submitted by Eric Wang and posted to the
IETF repository.

Name: draft-wang-sfc-receive-only
Revision: 01
Title: Receive-Only Service Function and External Service in SFC
Document date: 2016-10-25
Group: Individual Submission
Pages: 17
URL:            https://www.ietf.org/internet-drafts/draft-wang-sfc-receive=
-only-01.txt
Status:         https://datatracker.ietf.org/doc/draft-wang-sfc-receive-onl=
y/
Htmlized:       https://tools.ietf.org/html/draft-wang-sfc-receive-only-01
Diff:           https://www.ietf.org/rfcdiff?url2=3Ddraft-wang-sfc-receive-=
only-01

Abstract:
  A category of services such as Intrusion Detection Service and Packet
  Capture operates in "receive-only" mode.  They are "packet sinks"
  which consume all packets sent to them.  This document describes the
  proposals for such service to be part of the Service Function
  Chaining framework.




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<http://=
tools.ietf.org>.

The IETF Secretariat



--_000_EF11F8AB3EB044E5B2C97366C565C5ADciscocom_
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<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;" class=3D"">
<div class=3D"">Hi folks,</div>
<div class=3D""><br class=3D"">
</div>
Thanks for all the active discussions before and after the last revision wa=
s posted. &nbsp;Please let us know your comments and we look forward to mor=
e discussions in the next WG meeting in Seoul.
<div class=3D""><br class=3D"">
</div>
<div class=3D"">Regards,</div>
<div class=3D"">-Eric</div>
<div class=3D""><br class=3D"">
<div><br class=3D"">
<blockquote type=3D"cite" class=3D"">
<div class=3D"">Begin forwarded message:</div>
<br class=3D"Apple-interchange-newline">
<div style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margi=
n-left: 0px;" class=3D"">
<span style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica,=
 sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">From:
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica Neue,=
 Helvetica, sans-serif;" class=3D"">&lt;<a href=3D"mailto:internet-drafts@i=
etf.org" class=3D"">internet-drafts@ietf.org</a>&gt;<br class=3D"">
</span></div>
<div style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margi=
n-left: 0px;" class=3D"">
<span style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica,=
 sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Subject:
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica Neue,=
 Helvetica, sans-serif;" class=3D""><b class=3D"">New Version Notification =
for draft-wang-sfc-receive-only-01.txt</b><br class=3D"">
</span></div>
<div style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margi=
n-left: 0px;" class=3D"">
<span style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica,=
 sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Date:
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica Neue,=
 Helvetica, sans-serif;" class=3D"">October 25, 2016 at 3:34:10 PM PDT<br c=
lass=3D"">
</span></div>
<div style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margi=
n-left: 0px;" class=3D"">
<span style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica,=
 sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">To:
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica Neue,=
 Helvetica, sans-serif;" class=3D"">Eric Wang &lt;<a href=3D"mailto:ejwang@=
cisco.com" class=3D"">ejwang@cisco.com</a>&gt;, Kent Leung &lt;<a href=3D"m=
ailto:kleung@cisco.com" class=3D"">kleung@cisco.com</a>&gt;<br class=3D"">
</span></div>
<br class=3D"">
<div class=3D"">
<div class=3D""><br class=3D"">
A new version of I-D, draft-wang-sfc-receive-only-01.txt<br class=3D"">
has been successfully submitted by Eric Wang and posted to the<br class=3D"=
">
IETF repository.<br class=3D"">
<br class=3D"">
Name:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span><span=
 class=3D"Apple-tab-span" style=3D"white-space:pre"></span>draft-wang-sfc-r=
eceive-only<br class=3D"">
Revision:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span>0=
1<br class=3D"">
Title:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span><spa=
n class=3D"Apple-tab-span" style=3D"white-space:pre"></span>Receive-Only Se=
rvice Function and External Service in SFC<br class=3D"">
Document date:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </s=
pan>2016-10-25<br class=3D"">
Group:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span><spa=
n class=3D"Apple-tab-span" style=3D"white-space:pre"></span>Individual Subm=
ission<br class=3D"">
Pages:<span class=3D"Apple-tab-span" style=3D"white-space:pre"> </span><spa=
n class=3D"Apple-tab-span" style=3D"white-space:pre"></span>17<br class=3D"=
">
URL: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a h=
ref=3D"https://www.ietf.org/internet-drafts/draft-wang-sfc-receive-only-01.=
txt" class=3D"">https://www.ietf.org/internet-drafts/draft-wang-sfc-receive=
-only-01.txt</a><br class=3D"">
Status: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href=3D"https://=
datatracker.ietf.org/doc/draft-wang-sfc-receive-only/" class=3D"">https://d=
atatracker.ietf.org/doc/draft-wang-sfc-receive-only/</a><br class=3D"">
Htmlized: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href=3D"https://tools.ietf=
.org/html/draft-wang-sfc-receive-only-01" class=3D"">https://tools.ietf.org=
/html/draft-wang-sfc-receive-only-01</a><br class=3D"">
Diff: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href=
=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-wang-sfc-receive-only-01" cla=
ss=3D"">https://www.ietf.org/rfcdiff?url2=3Ddraft-wang-sfc-receive-only-01<=
/a><br class=3D"">
<br class=3D"">
Abstract:<br class=3D"">
&nbsp;&nbsp;A category of services such as Intrusion Detection Service and =
Packet<br class=3D"">
&nbsp;&nbsp;Capture operates in &quot;receive-only&quot; mode. &nbsp;They a=
re &quot;packet sinks&quot;<br class=3D"">
&nbsp;&nbsp;which consume all packets sent to them. &nbsp;This document des=
cribes the<br class=3D"">
&nbsp;&nbsp;proposals for such service to be part of the Service Function<b=
r class=3D"">
&nbsp;&nbsp;Chaining framework.<br class=3D"">
<br class=3D"">
<br class=3D"">
<br class=3D"">
<br class=3D"">
Please note that it may take a couple of minutes from the time of submissio=
n<br class=3D"">
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" class=3D"">
tools.ietf.org</a>.<br class=3D"">
<br class=3D"">
The IETF Secretariat<br class=3D"">
<br class=3D"">
</div>
</div>
</blockquote>
</div>
<br class=3D"">
</div>
</body>
</html>

--_000_EF11F8AB3EB044E5B2C97366C565C5ADciscocom_--

