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Subject: [sfc] sfc - Not having a session at IETF 105
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Tal Mizrahi, a chair of the sfc working group, indicated that the sfc working group does not plan to hold a session at IETF 105.

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From: Sam Aldrin <aldrin.ietf@gmail.com>
Date: Wed, 5 Jun 2019 13:46:19 -0700
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To: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>
Cc: James Guichard <james.n.guichard@futurewei.com>, "sfc@ietf.org" <sfc@ietf.org>
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Subject: Re: [sfc] WG Last Call draft-ietf-sfc-oam-framework-06
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--0000000000002b2ead058a99b1e7
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This is long overdue and important work functioning and operating SFC.
Support this doc as a co-author.

-sam

On Tue, May 28, 2019 at 7:53 AM Nagendra Kumar Nainar (naikumar) <
naikumar@cisco.com> wrote:

> Support as co-author.
>
>
>
> Regards,
>
> Nagendra
>
>
>
> *From: *sfc <sfc-bounces@ietf.org> on behalf of James Guichard <
> james.n.guichard@futurewei.com>
> *Date: *Tuesday, May 28, 2019 at 10:37 AM
> *To: *"sfc@ietf.org" <sfc@ietf.org>
> *Subject: *[sfc] WG Last Call draft-ietf-sfc-oam-framework-06
>
>
>
> Dear WG:
>
>
>
> This message starts a new two week WG Last Call on advancing
> https://datatracker.ietf.org/doc/draft-ietf-sfc-oam-framework/
> <https://nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdata=
tracker.ietf.org%2Fdoc%2Fdraft-ietf-sfc-oam-framework%2F&data=3D02%7C01%7Cj=
ames.n.guichard%40futurewei.com%7Ce47e5eb13f224f18c46408d6e378b2f7%7C0fee8f=
f2a3b240189c753a1d5591fedc%7C1%7C0%7C636946504868870205&sdata=3DlkKvAgmKik7=
lkqGANQpnIvBRdbjKAqYtzTUdTfB9f3Y%3D&reserved=3D0>
> for publication as an Informational RFC.
>
>
>
> Substantive comments and statements of support for publishing this
> document should be directed to the mailing list. Editorial suggestions ca=
n
> be sent to the authors.  This last call will end on 11th June 2019.
>
>
>
> Thanks!
>
>
>
> Jim & Joel
>
>
>
>
>
>
>
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
>

--0000000000002b2ead058a99b1e7
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<div dir=3D"ltr">This is long overdue and important work functioning and op=
erating SFC. Support this doc as a co-author.<div><br></div><div>-sam</div>=
</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">=
On Tue, May 28, 2019 at 7:53 AM Nagendra Kumar Nainar (naikumar) &lt;<a hre=
f=3D"mailto:naikumar@cisco.com">naikumar@cisco.com</a>&gt; wrote:<br></div>=
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_-3808601768522644913WordSection1">
<p class=3D"MsoNormal">Support as co-author.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
<p class=3D"MsoNormal">Nagendra<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(181,196,223);padding:3pt 0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:12pt;color:black">From: =
</span></b><span style=3D"font-size:12pt;color:black">sfc &lt;<a href=3D"ma=
ilto:sfc-bounces@ietf.org" target=3D"_blank">sfc-bounces@ietf.org</a>&gt; o=
n behalf of James Guichard &lt;<a href=3D"mailto:james.n.guichard@futurewei=
.com" target=3D"_blank">james.n.guichard@futurewei.com</a>&gt;<br>
<b>Date: </b>Tuesday, May 28, 2019 at 10:37 AM<br>
<b>To: </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>[sfc] WG Last Call draft-ietf-sfc-oam-framework-06<u></u><u=
></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p><span style=3D"font-size:12pt;color:black">Dear WG:<u></u><u></u></span>=
</p>
<p><span style=3D"font-size:12pt;color:black">=C2=A0<u></u><u></u></span></=
p>
<p><span style=3D"font-size:12pt;color:black">This message starts a new two=
 week WG Last Call on advancing
<a href=3D"https://nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2=
F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-ietf-sfc-oam-framework%2F&amp;data=
=3D02%7C01%7Cjames.n.guichard%40futurewei.com%7Ce47e5eb13f224f18c46408d6e37=
8b2f7%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C636946504868870205&amp;s=
data=3DlkKvAgmKik7lkqGANQpnIvBRdbjKAqYtzTUdTfB9f3Y%3D&amp;reserved=3D0" tar=
get=3D"_blank">
<span style=3D"color:rgb(5,99,193)">https://datatracker.ietf.org/doc/draft-=
ietf-sfc-oam-framework/</span></a> for publication as an Informational RFC.
<u></u><u></u></span></p>
<p><span style=3D"font-size:12pt;color:black">=C2=A0<u></u><u></u></span></=
p>
<p><span style=3D"font-size:12pt;color:black">Substantive comments and stat=
ements of support for publishing this document should be directed to the ma=
iling list. Editorial suggestions can be sent to the authors.=C2=A0 This la=
st call will end on 11th June 2019.<u></u><u></u></span></p>
<p><span style=3D"font-size:12pt;color:black">=C2=A0<u></u><u></u></span></=
p>
<p><span style=3D"font-size:12pt;color:black">Thanks!<u></u><u></u></span><=
/p>
<p><span style=3D"font-size:12pt;color:black">=C2=A0<u></u><u></u></span></=
p>
<p><span style=3D"font-size:12pt;color:black">Jim &amp; Joel<u></u><u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:black"><u></u>=
=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:black"><u></u>=
=C2=A0<u></u></span></p>
</div>
<div id=3D"gmail-m_-3808601768522644913Signature">
<p><span style=3D"font-size:12pt;color:black"><u></u>=C2=A0<u></u></span></=
p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:black"><u></u>=
=C2=A0<u></u></span></p>
</div>
</div>
</div>
</div>

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

--0000000000002b2ead058a99b1e7--


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From: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>
To: "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>, "James Guichard" <james.n.guichard@futurewei.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] WG Last Call draft-ietf-sfc-oam-framework-06
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Date: Thu, 6 Jun 2019 16:58:56 +0000
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Subject: Re: [sfc] WG Last Call draft-ietf-sfc-oam-framework-06
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Sat, 8 Jun 2019 10:11:31 -0700
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Subject: Re: [sfc] WG Last Call draft-ietf-sfc-oam-framework-06
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Dear Authors, Jim, Joel, et al.,
please find my comments to this draft below:

   - Section 2
      - An SFC layering model is introduced. I couldn't find it being
      mentioned in section 1.1, where the scope of the document is defined.
      - What VMx symbolize in Figure 1? To which layer of SFC they belong?
      - What is being symbolized by 'o' in Overlay network, Underlay
      network, and Link layers respectively?
      - What is the purpose of Figure 1 outside Section 2
      - what is the purpose of Section 2? For only one sentence in Section
      3 that states the obvious:

The SFC operates at the service layer.


   - Section 3
      - In "testing the service functions from any SFC-aware network
      devices (i.e.classifiers, controllers, other service nodes)", what is=
 the
      scope of testing expected? Testing, for example, NAT? Also, what
are "other
      service nodes"? Neither RFC 7665 nor this draft define service
nodes in SFC.
      - In "validate the correlation between a Service Function Chain and
      the actual forwarding path followed by a packet matching that SFC, et=
c.",
      is "the actual forwarding path followed" Rendered Service Path? If it=
 is
      so, then what is validated? That RSP is part of SFP? Also, what "etc.=
"
      refers to? Anything else?
      - Figure 2, SF OAM. I can envision a Controller generating test
      packets for the specific SF, SF3 in the figure. But where OAM
packets come
      from for SF3 and SF5 (line interconnecting two SFs)?
   - Section 3.1.1
      - I hoped to find the definition of availability, which is a
      performance metric, and how it is measured in SFC OAM. For example, M=
EF
      defines Availability Performance in MEF 10.3 (it's rather
lengthy to quote
      all, so just two sentences):

Availability Performance is the percentage of time within a specified time
interval *T* during which the Frame Loss Ratio is small.

Availability Performance is based on Service Frame loss during a sequence
of consecutive small time intervals.


   - Section 3.1.2
      - It opens with "Second SFC OAM requirement ..." but I couldn't find
      where the first requirement was listed.
      - Then the text explains that the scope of performance measurement of
      a service function component is "check the loss and delay induced by =
a
      specific service function". Would delay variation be of interest
too? Also,
      as noted above, availability is another performance metric that
      characterizes the loss ratio over a period of time. Should it be
discussed
      in the same paragraph or this paragraph title specifically refer to l=
oss
      and delay performance metrics since only these two metrics being
discussed?
   - Section 3.2.1
      - The text slides into the discussion of path connectivity
      verification and tracing RSPs. These are essential OAM functions but,=
 I
      believe, are not part of measuring the availability of an SFC.
   - Section 3.3
      - Is validation of a Classifier functioning is all that is required
      in Classifier OAM? Where are Classifier performance metrics, e.g., lo=
ss
      ratio, delay, and availability?
   - Section 4
      - In the first sentence s/is/are
      - Could you kindly help me understand "which many will be applicable
      to"?
      - "Various SFC OAM requirements listed in Section 3
      <https://tools.ietf.org/html/draft-ietf-sfc-oam-framework-06#section-=
3>"
      I found only one explicitly called out, in Section 3.1.2. Where
are others?
      - "Many of the OAM functions at different layers are already defined
      and in existence." Could you please support this statement with
references?
      - Besides s/service/the service/ something else seems missing in the
      closing of the sentence "In order to apply such OAM functions at serv=
ice
      layer, they have to be enhanced to operate a single SF/SFF to multipl=
e
      SFs/SFFs in an SFC and also in multiple SFCs."
      - Section 4.1
      - I think that the first sentence be would be clearer if it opens
      with "Connectivity verification ..."
      - I cannot agree that "Connectivity is mainly an on-demand function".
      If that's your view, in which category you place CFM (IEEE
802.1ag)? Also,
      ping is not actual connectivity verification function as it
doesn't detect
      misconnection.
      - In the last bullet, is it suggesting to use ping as proactive CC?
   - Section 4.2
      - CC OAM, e.g., BFD, does not monitor a device but, using positioning
      statement from RFC 5880, "path between two forwarding engines, includ=
ing
      interfaces, data link(s), and to the extent possible the
forwarding engines
      themselves."
      - The last bullet reads awkwardly "Notifying the failure upon failure
      detection for other OAM functions to take appropriate action." Also, =
can
      other applications receive failure notification?
   - Section 4.3
      - I think that the first two bullets should apply to any arbitrary
      set of SFC elements, not only to every component of the given SFC.
   - Section 4.4
      - I think that the second sentence can be improved by
      s/measurements/performance metrics/, so that it reads "These performa=
nce
      metrics could be measured pro-actively and on-demand."
      - Second para, first sentence. s/perform/measure/?
      - What the third and fourth sentences of the second para trying to
      convey? What is "approximation of packet loss"? Can you define it or =
give
      the reference to the definition of this performance metric?
      - The definition of a delay in SFC in the third para is confusing.
      What does it mean "delay is measured from time"? And when the second
      timestamp at the egress SFF should be taken?
      - Delay variation, I believe, is calculated, not measured.
      - What are resolution and accuracy for the delay and delay variation
      SFC PM OAM tools are required to provide, given that you expect
to measure
      them for an SF? I believe that would be very helpful to state in the
      document.
      - Also, considering the scale of measuring a delay introduced by an
      SF, what are the methods of obtaining accurate ToD?
   - Section 5.1
      - Again, regarding "connectivity" and "continuity". None of IP, MPLS
      (except MPLS-TP), or overlay OAM tools so far provides actual
connectivity
      verification. If these terms are used interchangeably in this documen=
t,
      that must be clearly stated. Alternatively, definitions of terms must=
 be
      provided, preferably with references to well-established in the indus=
try
      documents.
      - Information in Table 3 is outdated. With SFC WG draft on Active
      OAM, Ping and Trace columns must be set to Yes.
      - Why in Table 4 Netconf is not listed in the Notification column?
      - Assuming SF and SFC have data models and thus can be configured
      using, for example, Netconf. Why the same models cannot be used for
      orchestration? And how certain you are that there are no TOSCA models=
 for
      orchestration?
      - What prevents an implementation of SF or SFC from generating syslog
      notification?
   - Section 6.1
      - It refers only to RFC 8300 SFC NSH. Any consideration is given
      for RFC 8595 An MPLS-Based Forwarding Plane for Service Function Chai=
ning?
   - Section 6.2
      - RFC 5880 has no definition for "BFD reply packet". Please clarify.
   - Section 6.4.1
      - Without clear definition of the terms "SFF availability" and "SF
      availability" it is hard to agree that ICMP can be used to measure th=
is
      performance metric (see my notes at the top).
      - "...it can be used for basic OAM functions." Could you provide the
      reference to the document that defines the list of "basic OAM functio=
ns".
      Or provide the list itself in this draft.
   - Section 6.4.2
      - Applicability of S-BFD is discussed but not of BFD, as defined in
      RFC 5880. I couldn't find the explanation for excluding BFD from
      consideration.
   - Section 6.4.3
      -    Without the definition of availability for this draft, the
      following statement is subjective, at best "In-Situ OAM could be
used with
      O bit set and perform SF availability, SFC availability of performanc=
e
      measurement."
      - Section 6.4.4
      - Clearly is missing reference to draft-ietf-sfc-multilayer-oam.
      Surprisingly, the sectin refers to the draft that expired April 2, 20=
16.

 After reviewing how fundamental are outstanding, in my opinion, questions,
how numerous are problems with the text and how many statements are not
supported by definitions or proper references, I believe that the document
cannot be published in its current form.

Regards,
Greg


On Tue, May 28, 2019 at 7:37 AM James Guichard <
james.n.guichard@futurewei.com> wrote:

> Dear WG:
>
>
>
> This message starts a new two week WG Last Call on advancing
> https://datatracker.ietf.org/doc/draft-ietf-sfc-oam-framework/
> <https://nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdata=
tracker.ietf.org%2Fdoc%2Fdraft-ietf-sfc-oam-framework%2F&data=3D02%7C01%7Cj=
ames.n.guichard%40futurewei.com%7Ce47e5eb13f224f18c46408d6e378b2f7%7C0fee8f=
f2a3b240189c753a1d5591fedc%7C1%7C0%7C636946504868870205&sdata=3DlkKvAgmKik7=
lkqGANQpnIvBRdbjKAqYtzTUdTfB9f3Y%3D&reserved=3D0>
> for publication as an Informational RFC.
>
>
>
> Substantive comments and statements of support for publishing this
> document should be directed to the mailing list. Editorial suggestions ca=
n
> be sent to the authors.  This last call will end on 11th June 2019.
>
>
>
> Thanks!
>
>
>
> Jim & Joel
>
>
>
>
> _______________________________________________
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> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
>

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<div dir=3D"ltr">Dear Authors, Jim, Joel, et al.,<div>please find my commen=
ts to this draft below:</div><div><ul><li>Section 2=C2=A0</li><ul><li>An SF=
C layering model is introduced. I couldn&#39;t find it being mentioned in s=
ection 1.1, where the scope of the document is defined.</li><li>What VMx sy=
mbolize in Figure 1? To which layer of SFC they belong?</li><li>What is bei=
ng symbolized by &#39;o&#39; in Overlay network, Underlay network, and Link=
 layers respectively?</li><li>What is the purpose of Figure 1 outside Secti=
on 2</li><li>what is the purpose of Section 2? For only one sentence in Sec=
tion 3 that states the obvious:</li></ul></ul></div><blockquote style=3D"ma=
rgin:0 0 0 40px;border:none;padding:0px"><blockquote style=3D"margin:0 0 0 =
40px;border:none;padding:0px"><div>The SFC operates at the service layer.</=
div></blockquote></blockquote><div><ul><li>Section 3</li><ul><li>In &quot;t=
esting the service functions from any SFC-aware network devices (i.e.classi=
fiers, controllers, other service nodes)&quot;, what is the scope of testin=
g expected? Testing, for example, NAT? Also, what are &quot;other service n=
odes&quot;? Neither RFC 7665 nor this draft define service nodes in SFC.</l=
i><li>In &quot;validate the correlation between a Service Function Chain an=
d the actual forwarding path followed by a packet matching that SFC, etc.&q=
uot;, is &quot;the actual=C2=A0forwarding path followed&quot; Rendered Serv=
ice Path? If it is so, then what is validated? That RSP is part of SFP? Als=
o, what &quot;etc.&quot; refers to? Anything else?</li><li>Figure 2, SF OAM=
. I can envision a Controller generating test packets for the specific SF, =
SF3 in the figure. But where OAM packets come from for SF3 and SF5 (line in=
terconnecting two SFs)?</li></ul><li>Section 3.1.1</li><ul><li>I hoped to f=
ind the definition of availability, which is a performance metric, and how =
it is measured in SFC OAM. For example, MEF defines Availability Performanc=
e in MEF 10.3 (it&#39;s rather lengthy to quote all, so just two sentences)=
:</li></ul></ul></div><blockquote style=3D"margin:0 0 0 40px;border:none;pa=
dding:0px"><div><blockquote style=3D"margin:0 0 0 40px;border:none;padding:=
0px"><div><p style=3D"margin:10px 0px 0px;padding:0px;color:rgb(51,51,51);f=
ont-family:-apple-system,BlinkMacSystemFont,&quot;Segoe UI&quot;,Roboto,Oxy=
gen,Ubuntu,&quot;Fira Sans&quot;,&quot;Droid Sans&quot;,&quot;Helvetica Neu=
e&quot;,sans-serif;font-size:14px" class=3D"gmail-SG-bodytext">Availability=
 Performance is the percentage of time within a specified time interval=C2=
=A0<em><strong>T</strong></em>=C2=A0during which the Frame Loss Ratio is sm=
all.</p><p style=3D"margin:10px 0px 0px;padding:0px;color:rgb(51,51,51);fon=
t-family:-apple-system,BlinkMacSystemFont,&quot;Segoe UI&quot;,Roboto,Oxyge=
n,Ubuntu,&quot;Fira Sans&quot;,&quot;Droid Sans&quot;,&quot;Helvetica Neue&=
quot;,sans-serif;font-size:14px" class=3D"gmail-SG-bodytext">Availability P=
erformance is based on Service Frame loss during a sequence of consecutive =
small time intervals.=C2=A0</p></div></blockquote></div></blockquote><div><=
ul><li><font face=3D"-apple-system, BlinkMacSystemFont, Segoe UI, Roboto, O=
xygen, Ubuntu, Fira Sans, Droid Sans, Helvetica Neue, sans-serif" color=3D"=
#333333"><span style=3D"font-size:14px">Section 3.1.2</span></font></li><ul=
><li><font face=3D"-apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxy=
gen, Ubuntu, Fira Sans, Droid Sans, Helvetica Neue, sans-serif" color=3D"#3=
33333"><span style=3D"font-size:14px">It opens with &quot;</span></font>Sec=
ond SFC OAM requirement ...&quot; but I couldn&#39;t find where the first r=
equirement was listed.</li><li>Then the text explains that the scope of per=
formance measurement of a service function component is &quot;check the los=
s and delay induced by a specific service function&quot;. Would delay varia=
tion be of interest too? Also, as noted above, availability is another perf=
ormance metric that characterizes the loss ratio over a period of time. Sho=
uld it be discussed in the same paragraph or this paragraph title specifica=
lly refer to loss and delay performance metrics since only these two metric=
s being discussed?</li></ul><li>Section 3.2.1</li><ul><li>The text slides i=
nto the discussion of path connectivity verification and tracing RSPs. Thes=
e are essential OAM functions but, I believe, are not part of measuring the=
 availability of an SFC.</li></ul><li>Section 3.3</li><ul><li>Is validation=
 of a Classifier functioning is all that is required in Classifier OAM? Whe=
re are Classifier performance metrics, e.g., loss ratio, delay, and availab=
ility?</li></ul><li>Section 4</li><ul><li>In the first sentence s/is/are</l=
i><li>Could you kindly help me understand &quot;which many will be applicab=
le to&quot;?</li><li>&quot;Various SFC OAM requirements listed in <a style=
=3D"font-size:13.3333px" href=3D"https://tools.ietf.org/html/draft-ietf-sfc=
-oam-framework-06#section-3">Section 3</a>&quot; I found only one explicitl=
y called out, in Section 3.1.2. Where are others?</li><li>&quot;Many of the=
 OAM functions at different layers are already defined and in existence.&qu=
ot; Could you please support this statement with references?</li><li>Beside=
s s/service/the service/ something else seems missing in the closing of the=
 sentence &quot;In order to apply such OAM functions at service layer, they=
 have to be enhanced to operate a single SF/SFF to multiple SFs/SFFs in an =
SFC and also in multiple SFCs.&quot;<br></li></ul><li>Section 4.1</li><ul><=
li>I think that the first sentence  be would be clearer if it opens with &q=
uot;Connectivity verification ...&quot;</li><li>I cannot agree that &quot;C=
onnectivity is mainly an on-demand function&quot;. If that&#39;s your view,=
 in which category you place CFM (IEEE 802.1ag)? Also, ping is not actual c=
onnectivity verification function as it doesn&#39;t detect misconnection.</=
li><li>In the last bullet, is it suggesting to use ping as proactive CC?</l=
i></ul><li>Section 4.2</li><ul><li>CC OAM, e.g., BFD, does not monitor a de=
vice but, using positioning statement from RFC 5880, &quot;path between two=
 forwarding engines, including interfaces, data link(s), and to the extent =
possible the forwarding engines themselves.&quot;</li><li>The last bullet r=
eads awkwardly &quot;Notifying the failure upon failure detection for other=
 OAM functions to take appropriate action.&quot; Also, can other applicatio=
ns receive failure notification?</li></ul><li>Section 4.3</li><ul><li>I thi=
nk that the first two bullets should apply to any arbitrary set of SFC elem=
ents, not only to every component of the given SFC.</li></ul><li>Section 4.=
4</li><ul><li>I think that the second sentence can be improved by s/measure=
ments/performance metrics/, so that it reads &quot;These performance metric=
s could be measured pro-actively and on-demand.&quot;</li><li>Second para, =
first sentence. s/perform/measure/?</li><li>What the third and fourth sente=
nces of the second para trying to convey? What is &quot;approximation of pa=
cket loss&quot;? Can you define it or give the reference to the definition =
of this performance metric?</li><li>The definition of a delay in SFC in the=
 third para is confusing. What does it mean &quot;delay is measured from ti=
me&quot;? And when the second timestamp at the egress SFF should be taken?<=
/li><li>Delay variation, I believe, is calculated, not measured.</li><li>Wh=
at are resolution and accuracy for the delay and delay variation SFC PM OAM=
 tools are required to provide, given that you expect to measure them for a=
n SF? I believe that would be very helpful to state in the document.</li><l=
i>Also, considering the scale of measuring a delay introduced by an SF, wha=
t are the methods of obtaining accurate ToD?</li></ul><li>Section 5.1</li><=
ul><li>Again, regarding &quot;connectivity&quot; and &quot;continuity&quot;=
. None of IP, MPLS (except MPLS-TP), or overlay OAM tools so far provides a=
ctual connectivity verification. If these terms are used interchangeably in=
 this document, that must be clearly stated. Alternatively, definitions of =
terms must be provided, preferably with references to well-established in t=
he industry documents.</li><li>Information in Table 3 is outdated. With SFC=
 WG draft on Active OAM, Ping and Trace columns must be set to Yes.</li><li=
>Why in Table 4 Netconf is not listed in the Notification column?</li><li>A=
ssuming SF and SFC have data models and thus can be configured using, for e=
xample, Netconf. Why the same models cannot be used for orchestration? And =
how certain you are that there are no TOSCA models for orchestration?</li><=
li>What prevents an implementation of SF or SFC from generating syslog noti=
fication?</li></ul><li>Section 6.1</li><ul><li>It refers only to RFC 8300 S=
FC NSH. Any consideration is given for=C2=A0RFC 8595 An MPLS-Based Forwardi=
ng Plane for Service Function Chaining?</li></ul><li>Section 6.2</li><ul><l=
i>RFC 5880 has no definition for &quot;BFD reply packet&quot;. Please clari=
fy.</li></ul><li>Section 6.4.1</li><ul><li>Without clear definition of the =
terms &quot;SFF availability&quot; and &quot;SF availability&quot; it is ha=
rd to agree that ICMP can be used to measure this performance metric (see m=
y notes at the top).</li><li>&quot;...it can be used for basic OAM function=
s.&quot; Could you provide the reference to the document that defines the l=
ist of &quot;basic OAM functions&quot;. Or provide the list itself in this =
draft.</li></ul><li>Section 6.4.2</li><ul><li>Applicability of S-BFD is dis=
cussed but not of BFD, as defined in RFC 5880. I couldn&#39;t find the expl=
anation for excluding BFD from consideration.</li></ul><li>Section 6.4.3</l=
i><ul><li>=C2=A0 =C2=A0Without the definition of availability for this draf=
t, the following statement is subjective, at best &quot;In-Situ OAM could b=
e used with O bit set and perform SF availability, SFC availability of perf=
ormance measurement.&quot;<br></li></ul><li>Section 6.4.4</li><ul><li>Clear=
ly is missing reference to draft-ietf-sfc-multilayer-oam. Surprisingly, the=
 sectin refers to the draft that expired=C2=A0April 2, 2016.</li></ul></ul>=
=C2=A0After reviewing how fundamental are outstanding, in my opinion, quest=
ions, how numerous are problems with the text and how many statements are n=
ot supported by definitions or proper references, I believe that the docume=
nt cannot be published in its current form.</div><div><br></div><div>Regard=
s,</div><div>Greg</div><div><br></div></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Tue, May 28, 2019 at 7:37 AM James=
 Guichard &lt;<a href=3D"mailto:james.n.guichard@futurewei.com" target=3D"_=
blank">james.n.guichard@futurewei.com</a>&gt; wrote:<br></div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px soli=
d rgb(204,204,204);padding-left:1ex">




<div dir=3D"ltr">
<div style=3D"color:rgb(0,0,0);font-family:Calibri,Arial,Helvetica,sans-ser=
if;font-size:12pt">
<font color=3D"#000000" face=3D"Times New Roman" size=3D"3"></font>
<p><span style=3D"color:black;font-size:12pt"><font face=3D"Calibri">Dear W=
G:</font></span></p>
<font color=3D"#000000" face=3D"Times New Roman" size=3D"3"></font>
<p><span style=3D"color:black;font-size:12pt"><font face=3D"Calibri">=C2=A0=
</font></span></p>
<font color=3D"#000000" face=3D"Times New Roman" size=3D"3"></font>
<p><span style=3D"color:black;font-size:12pt"><font face=3D"Calibri">This m=
essage starts a new two week WG Last Call on advancing
</font><a href=3D"https://nam03.safelinks.protection.outlook.com/?url=3Dhtt=
ps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-ietf-sfc-oam-framework%2F&amp=
;data=3D02%7C01%7Cjames.n.guichard%40futurewei.com%7Ce47e5eb13f224f18c46408=
d6e378b2f7%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C636946504868870205&=
amp;sdata=3DlkKvAgmKik7lkqGANQpnIvBRdbjKAqYtzTUdTfB9f3Y%3D&amp;reserved=3D0=
" target=3D"_blank"><span style=3D"color:rgb(5,99,193)"><font face=3D"Calib=
ri">https://datatracker.ietf.org/doc/draft-ietf-sfc-oam-framework/</font></=
span></a><font face=3D"Calibri">
 for publication as an Informational RFC. </font></span></p>
<font color=3D"#000000" face=3D"Times New Roman" size=3D"3"></font>
<p><span style=3D"color:black;font-size:12pt"><font face=3D"Calibri">=C2=A0=
</font></span></p>
<font color=3D"#000000" face=3D"Times New Roman" size=3D"3"></font>
<p><span style=3D"color:black;font-size:12pt"><font face=3D"Calibri">Substa=
ntive comments and statements of support for publishing this document shoul=
d be directed to the mailing list. Editorial suggestions can be sent to the=
 authors.=C2=A0 This last call will end
 on 11th June 2019.</font></span></p>
<font color=3D"#000000" face=3D"Times New Roman" size=3D"3"></font>
<p><span style=3D"color:black;font-size:12pt"><font face=3D"Calibri">=C2=A0=
</font></span></p>
<font color=3D"#000000" face=3D"Times New Roman" size=3D"3"></font>
<p><span style=3D"color:black;font-size:12pt"><font face=3D"Calibri">Thanks=
!</font></span></p>
<font color=3D"#000000" face=3D"Times New Roman" size=3D"3"></font>
<p><span style=3D"color:black;font-size:12pt"><font face=3D"Calibri">=C2=A0=
</font></span></p>
<font color=3D"#000000" face=3D"Times New Roman" size=3D"3"></font>
<p><span style=3D"color:black;font-size:12pt"><font face=3D"Calibri">Jim &a=
mp; Joel</font></span></p>
<font color=3D"#000000" face=3D"Times New Roman" size=3D"3"></font><br>
</div>
<div style=3D"color:rgb(0,0,0);font-family:Calibri,Arial,Helvetica,sans-ser=
if;font-size:12pt">
<br>
</div>
<div id=3D"gmail-m_4581156782369329945gmail-m_7639247894156380501gmail-m_84=
68132320106094551Signature">
<div style=3D"color:rgb(0,0,0);font-family:Calibri,Arial,Helvetica,sans-ser=
if;font-size:12pt">
<font color=3D"#000000" face=3D"Times New Roman" size=3D"3"></font></div>
<p style=3D"margin:0in 0in 0pt;color:rgb(0,0,0);font-family:Calibri,Arial,H=
elvetica,sans-serif;font-size:12pt">
<font color=3D"#000000" face=3D"Calibri"><font color=3D"#000000" face=3D"Ti=
mes New Roman" size=3D"3"><br>
</font></font></p>
<div style=3D"color:rgb(0,0,0);font-family:Calibri,Arial,Helvetica,sans-ser=
if;font-size:12pt">
<br>
</div>
</div>
</div>

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

--00000000000076d1f1058ad30a19--


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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Adrian Farrel <adrian@olddog.co.uk>
CC: James Guichard <james.n.guichard@futurewei.com>, "sfc@ietf.org" <sfc@ietf.org>
Thread-Topic: [sfc] WG Last Call draft-ietf-sfc-oam-framework-06
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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>
CC: Greg Mirsky <gregimirsky@gmail.com>, Service Function Chaining IETF list <sfc@ietf.org>
Thread-Topic: [sfc] Adopting draft-mirsky-sfc-pmamm
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Subject: Re: [sfc] Adopting draft-mirsky-sfc-pmamm
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From: "Cesar Obediente (cobedien)" <cobedien@cisco.com>
To: "sfc@ietf.org" <sfc@ietf.org>, "sfc-chairs@ietf.org" <sfc-chairs@ietf.org>
Thread-Topic: Broken Link. -- IETF 87 - NSC 
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Subject: [sfc] Broken Link. -- IETF 87 - NSC
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--_000_FFC23D1550324490B701D5309543E15Fciscocom_
Content-Type: text/plain; charset="us-ascii"
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Hi

I was trying to look at the recording for BOF: Network Service Chaining BOF=
 under this link

https://tools.ietf.org/agenda/87/

http://ietf87streaming.dnsalias.net/ietf/ietf874.m3u

But it is not working. Can someone please help me find the correct link.

Thanks

Cesar




-----------------------------------------

Cesar Obediente, CCIE 5620
Principal Systems Engineer
813-220-5736
co@cisco.com<mailto:co@cisco.com>
@cobedien
Blog: dcnextgen.blogspot.com<http://dcnextgen.blogspot.com>

--_000_FFC23D1550324490B701D5309543E15Fciscocom_
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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; line-break:=
 after-white-space;" class=3D"">
<span style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);" class=3D"">=
Hi</span>
<div class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><=
br class=3D"">
</div>
<div class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">I=
 was trying to look at the recording for&nbsp;BOF: Network Service Chaining=
 BOF under this link</div>
<div class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><=
br class=3D"">
</div>
<div class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><=
a href=3D"https://tools.ietf.org/agenda/87/" class=3D"">https://tools.ietf.=
org/agenda/87/</a></div>
<div class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><=
br class=3D"">
</div>
<div class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><=
a href=3D"http://ietf87streaming.dnsalias.net/ietf/ietf874.m3u" class=3D"">=
http://ietf87streaming.dnsalias.net/ietf/ietf874.m3u</a></div>
<div class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><=
br class=3D"">
</div>
<div class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">B=
ut it is not working. Can someone please help me find the correct link.</di=
v>
<div class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><=
br class=3D"">
</div>
<div class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">T=
hanks</div>
<div class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><=
br class=3D"">
</div>
<div class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">C=
esar</div>
<div class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><=
br class=3D"">
</div>
<div class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><=
br class=3D"">
</div>
<br class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">
<br class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">
<div class=3D"" style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">-=
----------------------------------------<br class=3D"">
<br class=3D"">
Cesar Obediente, CCIE 5620<br class=3D"">
Principal Systems Engineer<br class=3D"">
813-220-5736<br class=3D"">
<a href=3D"mailto:co@cisco.com" class=3D"">co@cisco.com</a><br class=3D"">
@cobedien<br class=3D"">
Blog:&nbsp;<a href=3D"http://dcnextgen.blogspot.com" class=3D"">dcnextgen.b=
logspot.com</a></div>
</body>
</html>

--_000_FFC23D1550324490B701D5309543E15Fciscocom_--


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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: "gregory.mirsky@ztetx.com" <gregory.mirsky@ztetx.com>
CC: Service Function Chaining IETF list <sfc@ietf.org>, "sfc-chairs@ietf.org" <sfc-chairs@ietf.org>
Thread-Topic: [sfc] Adopting draft-mirsky-sfc-pmamm
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From: Greg Mirsky <gregimirsky@gmail.com>
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Cc: "gregory.mirsky@ztetx.com" <gregory.mirsky@ztetx.com>, "sfc-chairs@ietf.org" <sfc-chairs@ietf.org>,  Service Function Chaining IETF list <sfc@ietf.org>
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Hi Carlos,
please find my followup comments in-line tagged GIM2>>.
Looking forward to the updated draft.

Regards,
Greg

On Sun, Jun 16, 2019 at 12:33 PM Carlos Pignataro (cpignata) <
cpignata@cisco.com> wrote:

> Hello, Greg,
>
> > On Jun 10, 2019, at 2:49 AM, gregory.mirsky@ztetx.com wrote:
> >
> > Hi Carlos,
> > thank you for your expedient response to my comments.
>
> You are welcome.
>
> > I'll be expecting updated text to review how my comments were addressed=
.
>
> Thanks in advance for, after a new revision is posted, verifying we are
> not missing any typographical correction; and thanks again for the thorou=
gh
> set of editorial comments.
>
> > In the meantime, you seemed to equate availability and uptime in the
> following response:
> > "Section 3.1.1 is about availability / uptime ..."
> > Is my understanding of your response is correct and you believe that
> availability is another term for uptime and both can be used
> interchangeably?
>
> Greg, first, =E2=80=9C/=E2=80=9C does not mean =E2=80=9Cequate=E2=80=9D. =
Where did I write that those two
> terms are equal, and can be used interchangeably? Where did you conjure
> that understanding from? Please, again, refrain for putting words that I
> did not write in my response.
>
GIM2>> I've asked for clarification, nothing else. If you consider
"availability" is a different metric from uptime, then I hope the draft
will explain how it is measured, e.g., second, meters, packets or else.

>
> Second, taking half a sentence out of context is not the best way to
> clarify understanding.
>
> Third, in regards to your comment on =E2=80=9Cavailability", I asked you =
this:
>         "If you have a specific suggestion as a replacement for
> =E2=80=9Cavailability=E2=80=99, please share.=E2=80=9D
> But you chose to not share a suggestion.
>
GIM2>> On the contrary. In my first comments, I've referenced the MEF
document that includes the definition of the availability of ME service. As
I understand, you've dismissed it. Well, if you don't agree with my
recommendation, then you surely have an idea of your own.

>
> Fourth, Section 3.1.1 explains the choice of term quite well:
> https://tools.ietf.org/html/draft-ietf-sfc-oam-framework-06#section-3.1.1
> Oversimplifying, somewhere in the continuum of liveness and full
> functionality.
>
GIM2>> If you believe that the section you've referred to provides the
adequate definition of the availability as a performance metric, then you
would not be hard to provide the quote that explains how this metric is
measured or calculated. The availability is the performance metric, you
agree to that?

>
> If the WG believes that the latter is largely out of scope, we can clarif=
y
> that and use the former (i.e., liveness).
>
GIM2>> In that case, I'll ask the same questions about "liveness" - in what
it is measured, how it is calculated.

>
> I trust that will help,
>
> Carlos.
>
>
> >
> > Regards,
> > Greg
> >
> > Greg,
> >
> > Thank you for taking the time to review this important document.
> >
> > My analysis of your review is that the vast majority ((almost) all) of
> your comments are editorial in nature =E2=80=94 from typos to readability
> suggestions. We will make updates to the document to address your comment=
s
> and suggestions, and thus improve the readability of the document.
> >
> > A new revision will address all the comments (all typos you called out,
> editorial issues and improvements, except where there=E2=80=99s only a pe=
rsonal
> editorial preference) as replied to below.
> >
> > From the less editorial: We will also add some text to clarify "BFD
> applicability" and to clarity =E2=80=9CAvailability=E2=80=9D, and all oth=
ers have been
> responded to below including whether there were references missing (BTW w=
e
> will move [ICMPv4] and [ICMPv6] as Informational as per Adrian=E2=80=99s =
comment).
> >
> > Please see inline for some specific answers.
> >
> > On Jun 8, 2019, at 1:11 PM, Greg Mirsky <gregimirsky@gmail.com<mailto:
> gregimirsky@gmail.com>> wrote:
> >
> > Dear Authors, Jim, Joel, et al.,
> > please find my comments to this draft below:
> >
> >   *   Section 2
> >      *   An SFC layering model is introduced. I couldn't find it being
> mentioned in section 1.1, where the scope of the document is defined.
> >
> > A model is explained, not introduced. This follows the SFC models.
> >
> >      *   What VMx symbolize in Figure 1? To which layer of SFC they
> belong?
> >
> > Virtual Machine.
> >
> >      *   What is being symbolized by 'o' in Overlay network, Underlay
> network, and Link layers respectively?
> >
> > What Adrian referred to as =E2=80=9Clegs=E2=80=9D. We will slightly upd=
ate this as per
> Adrian=E2=80=99s comment.
> >
> >      *   What is the purpose of Figure 1 outside Section 2
> >
> > I do not understand this question.
> >
> >      *   what is the purpose of Section 2? For only one sentence in
> Section 3 that states the obvious:
> >
> > The SFC operates at the service layer.
> >
> > I apologize I do no follow the meaning of your note. But, S2 explains
> the model which is used in the doc, and =E2=80=9Cobvious=E2=80=9D is in t=
he eye of the
> beholder. Note that IETF documents have cross functional review, might no=
t
> be obvious to all readers.
> >
> >   *   Section 3
> >      *   In "testing the service functions from any SFC-aware network
> devices (i.e.classifiers, controllers, other service nodes)", what is the
> scope of testing expected? Testing, for example, NAT? Also, what are "oth=
er
> service nodes"? Neither RFC 7665 nor this draft define service nodes in S=
FC.
> >
> > Good editorial point, we can change =E2=80=9Cservice node=E2=80=9D thro=
ughout the
> document if it makes it easier, bu RFC 8300 does use the term =E2=80=9Cse=
rvice
> node=E2=80=9D.
> >
> >      *   In "validate the correlation between a Service Function Chain
> and the actual forwarding path followed by a packet matching that SFC,
> etc.", is "the actual forwarding path followed" Rendered Service Path? If
> it is so, then what is validated? That RSP is part of SFP? Also, what
> "etc." refers to? Anything else?
> >
> > What is tested is the correlation. We can add RSP and remove the etc as
> editorial comments.
> >
> >
> >      *   Figure 2, SF OAM.. I can envision a Controller generating test
> packets for the specific SF, SF3 in the figure. But where OAM packets com=
e
> from for SF3 and SF5 (line interconnecting two SFs)?
> >
> > This figure is exemplary and ilustrative for highlighting the three
> defined components.
> >
> >   *   Section 3.1.1
> >      *   I hoped to find the definition of availability, which is a
> performance metric, and how it is measured in SFC OAM. For example, MEF
> defines Availability Performance in MEF 10.3 (it's rather lengthy to quot=
e
> all, so just two sentences):
> >
> > Availability Performance is the percentage of time within a specified
> time interval T during which the Frame Loss Ratio is small.
> >
> > Availability Performance is based on Service Frame loss during a
> sequence of consecutive small time intervals.
> >
> >
> > I=E2=80=99m not sure of the relevance of the MEF comment, but solutions=
 can
> define what they measure.
> >
> > If you have a specific suggestion as a replacement for =E2=80=9Cavailab=
ility=E2=80=99,
> please share. However, I=E2=80=99ll say that =E2=80=9Cavailability=E2=80=
=9D is used in other RFCs
> as a general term.
> >
> >   *   Section 3.1.2
> >      *   It opens with "Second SFC OAM requirement ..." but I couldn't
> find where the first requirement was listed.
> >
> > Section 3.1.1 begins with =E2=80=9COne SFC OAM requirement=E2=80=9D.
> >
> >
> >      *   Then the text explains that the scope of performance
> measurement of a service function component is "check the loss and delay
> induced by a specific service function". Would delay variation be of
> interest too? Also, as noted above, availability is another performance
> metric that characterizes the loss ratio over a period of time. Should it
> be discussed in the same paragraph or this paragraph title specifically
> refer to loss and delay performance metrics since only these two metrics
> being discussed?
> >
> > Section 3.1.1 is about availability / uptime, Section 3.1.2. about
> specific PM such as delay, loss.
> >
> >   *   Section 3.2.1
> >      *   The text slides into the discussion of path connectivity
> verification and tracing RSPs. These are essential OAM functions but, I
> believe, are not part of measuring the availability of an SFC.
> >
> > Only Section 3.1.1 is about availability. Section 3.2.1 is parallel to
> 3.1.1 and a different topic.
> >
> >   *   Section 3.3
> >      *   Is validation of a Classifier functioning is all that is
> required in Classifier OAM? Where are Classifier performance metrics, e.g=
.,
> loss ratio, delay, and availability?
> >
> > Are there specific OAM functions on the classifier that you believe are
> missing? Do you believe delay in the classifier is important? Please shar=
e
> some text about it.
> >
> >   *   Section 4
> >      *   In the first sentence s/is/are
> >
> > Agreed. Thank you.
> >
> >      *   Could you kindly help me understand "which many will be
> applicable to=E2=80=9D?
> >
> > Yes. Many functions applicable to many components. We can reword for
> ease of clarity.
> >
> >      *   "Various SFC OAM requirements listed in Section
> > 3<https://tools.ietf.org/html/draft-ietf-sfc-oam-framework-06#section-3
> >"
> >  I found only one explicitly called out, in Section 3.1.2. Where are
> others?
> >
> > Section 3.1.1 for example.
> >
> >      *   "Many of the OAM functions at different layers are already
> defined and in existence." Could you please support this statement with
> references?
> >
> > We can do better =E2=80=94 see Section 5.1.
> >
> >      *   Besides s/service/the service/ something else seems missing in
> the closing of the sentence "In order to apply such OAM functions at
> service layer, they have to be enhanced to operate a single SF/SFF to
> multiple SFs/SFFs in an SFC and also in multiple SFCs.=E2=80=9D
> >
> > We will fix this editorial.
> >
> >   *   Section 4.1
> >      *   I think that the first sentence be would be clearer if it open=
s
> with "Connectivity verification =E2=80=A6=E2=80=9D
> >
> > It would be redundant with =E2=80=9C function to verify"
> >
> >      *   I cannot agree that "Connectivity is mainly an on-demand
> function". If that's your view, in which category you place CFM (IEEE
> 802.1ag)? Also, ping is not actual connectivity verification function as =
it
> doesn't detect misconnection.
> >
> > We can change to LSP Ping.
> >
> >      *   In the last bullet, is it suggesting to use ping as proactive
> CC?
> >
> > No.
> >
> >   *   Section 4.2
> >      *   CC OAM, e.g., BFD, does not monitor a device but, using
> positioning statement from RFC 5880, "path between two forwarding engines=
,
> including interfaces, data link(s), and to the extent possible the
> forwarding engines themselves.=E2=80=9D
> >
> > Good point, we can remove =E2=80=9Cdevice"
> >
> >      *   The last bullet reads awkwardly "Notifying the failure upon
> failure detection for other OAM functions to take appropriate action."
> Also, can other applications receive failure notification?
> >
> > We can reword if you find it confusing.
> >
> >   *   Section 4.3
> >      *   I think that the first two bullets should apply to any
> arbitrary set of SFC elements, not only to every component of the given S=
FC.
> >   *   Section 4.4
> >      *   I think that the second sentence can be improved by
> s/measurements/performance metrics/, so that it reads "These performance
> metrics could be measured pro-actively and on-demand."
> >      *   Second para, first sentence. s/perform/measure/?
> >      *   What the third and fourth sentences of the second para trying
> to convey? What is "approximation of packet loss"? Can you define it or
> give the reference to the definition of this performance metric?
> >
> > Yes, we can make these editorial suggestions above.
> >
> >      *   The definition of a delay in SFC in the third para is
> confusing. What does it mean "delay is measured from time"? And when the
> second timestamp at the egress SFF should be taken?
> >
> > Can you please provide a definition?
> >
> >      *   Delay variation, I believe, is calculated, not measured.
> >
> > OK.
> >
> >      *   What are resolution and accuracy for the delay and delay
> variation SFC PM OAM tools are required to provide, given that you expect
> to measure them for an SF? I believe that would be very helpful to state =
in
> the document.
> >      *   Also, considering the scale of measuring a delay introduced by
> an SF, what are the methods of obtaining accurate ToD?
> >   *   Section 5.1
> >      *   Again, regarding "connectivity" and "continuity".. None of IP,
> MPLS (except MPLS-TP), or overlay OAM tools so far provides actual
> connectivity verification. If these terms are used interchangeably in thi=
s
> document, that must be clearly stated. Alternatively, definitions of term=
s
> must be provided, preferably with references to well-established in the
> industry documents.
> >
> > We are using IETF nomenclatures.
> >
> >      *   Information in Table 3 is outdated. With SFC WG draft on Activ=
e
> OAM, Ping and Trace columns must be set to Yes.
> >
> > No. This table covers existing OAM Functions fully defined, and/or with
> running code. This include OAM functions that can actually be used
> (normatively in documents or in practice on an actual wire).
> >
> >      *   Why in Table 4 Netconf is not listed in the Notification colum=
n?
> >
> > Good point! Will add.
> >
> >      *   Assuming SF and SFC have data models and thus can be configure=
d
> using, for example, Netconf. Why the same models cannot be used for
> orchestration? And how certain you are that there are no TOSCA models for
> orchestration?
> >
> > If you know of any additional model, please share.
> >
> >      *   What prevents an implementation of SF or SFC from generating
> syslog notification?
> >
> > Someone defining it and someone coding it?
> >
> >   *   Section 6.1
> >      *   It refers only to RFC 8300 SFC NSH.
> >
> > See the last sentence of the Abstract of RFC 8300.
> >
> >      *   Any consideration is given for RFC 8595 An MPLS-Based
> Forwarding Plane for Service Function Chaining?
> >
> > Do you have any suggestion beyond the existing text that says that
> >    Any other overlay encapsulations used in future must have a way to
> >    mark the packet as OAM packet.
> >
> >
> >
> >   *   Section 6.2
> >      *   RFC 5880 has no definition for "BFD reply packet". Please
> clarify.
> >
> > Typo. Will fix.
> >
> >   *   Section 6.4.1
> >      *   Without clear definition of the terms "SFF availability" and
> "SF availability" it is hard to agree that ICMP can be used to measure th=
is
> performance metric (see my notes at the top).
> >      *   "...it can be used for basic OAM functions." Could you provide
> the reference to the document that defines the list of "basic OAM
> functions". Or provide the list itself in this draft.
> >
> > We will clarify these both editorially.
> >
> >   *   Section 6.4.2
> >      *   Applicability of S-BFD is discussed but not of BFD, as defined
> in RFC 5880. I couldn't find the explanation for excluding BFD from
> consideration.
> >
> > The text already mentions BFD, but we can expand a bit.
> >
> >   *   Section 6.4.3
> >      *      Without the definition of availability for this draft, the
> following statement is subjective, at best "In-Situ OAM could be used wit=
h
> O bit set and perform SF availability, SFC availability of performance
> measurement.=E2=80=9D
> >
> > See above.
> >
> >   *   Section 6.4.4
> >      *   Clearly is missing reference to draft-ietf-sfc-multilayer-oam.
> Surprisingly, the sectin refers to the draft that expired April 2, 2016.
> >
> > Not surprising, and not missing. See above.
> >
> >  After reviewing how fundamental are outstanding, in my opinion,
> questions, how numerous are problems with the text and how many statement=
s
> are not supported by definitions or proper references, I believe that the
> document cannot be published in its current form.
> >
> > Thank you again for taking time to review this document. See above.
> >
> >
> > Regards,
> > Greg
> >
> >
> > On Tue, May 28, 2019 at 7:37 AM James Guichard <
> james.n.guichard@futurewei.com<mailto:james.n.guichard@futurewei.com>>
> wrote:
> >
> > Dear WG:
> >
> >
> >
> > This message starts a new two week WG Last Call on advancing
> > https://datatracker.ietf.org/doc/draft-ietf-sfc-oam-framework/<
> https://nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatat=
racker.ietf.org%2Fdoc%2Fdraft-ietf-sfc-oam-framework%2F&data=3D02%7C01%7Cja=
mes.n.guichard%40futurewei.com%7Ce47e5eb13f224f18c46408d6e378b2f7%7C0fee8ff=
2a3b240189c753a1d5591fedc%7C1%7C0%7C636946504868870205&sdata=3DlkKvAgmKik7l=
kqGANQpnIvBRdbjKAqYtzTUdTfB9f3Y%3D&reserved=3D0
> >
> >  for publication as an Informational RFC.
> >
> >
> >
> > Substantive comments and statements of support for publishing this
> document should be directed to the mailing list. Editorial suggestions ca=
n
> be sent to the authors.
> >
> > Please let me know if there=E2=80=99s anything that was missed on this =
reply.
> >
> > Thanks,
> >
> > Carlos.
> >
> > This last call will end on 11th June 2019.
> >
> >
> >
> > Thanks!
> >
> >
> >
> > Jim & Joel
> >
> >
> >
> >
> > _______________________________________________
> > 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
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Greg Mirsky
> >
> >
> >
> > Sr. Standardization Expert
> > =E9=A2=84=E7=A0=94=E6=A0=87=E5=87=86=E9=83=A8/=E6=9C=89=E7=BA=BF=E7=A0=
=94=E7=A9=B6=E9=99=A2/=E6=9C=89=E7=BA=BF=E4=BA=A7=E5=93=81=E7=BB=8F=E8=90=
=A5=E9=83=A8 Standard Preresearch Dept./Wireline Product R&D
> Institute/Wireline Product Operation Division
> >
> >
> >
> >
> > <9ae3e214c17d49ed935d87c674ba3ee2.jpg>
> <24242e5637af428891c4db731e7765ad.jpg>
> > E: gregory.mirsky@ztetx.com
> > www.zte.com.cn
>
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc
>

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<div dir=3D"ltr"><div>Hi Carlos,</div><div>please find my followup comments=
 in-line tagged GIM2&gt;&gt;.</div><div>Looking forward to the updated draf=
t.</div><div><br></div><div>Regards,</div><div>Greg</div><br><div class=3D"=
gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Jun 16, 2019 at =
12:33 PM Carlos Pignataro (cpignata) &lt;<a href=3D"mailto:cpignata@cisco.c=
om">cpignata@cisco.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_q=
uote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,2=
04);padding-left:1ex">Hello, Greg,<br>
<br>
&gt; On Jun 10, 2019, at 2:49 AM, <a href=3D"mailto:gregory.mirsky@ztetx.co=
m" target=3D"_blank">gregory.mirsky@ztetx.com</a> wrote:<br>
&gt; <br>
&gt; Hi Carlos,<br>
&gt; thank you for your expedient response to my comments.<br>
<br>
You are welcome.<br>
<br>
&gt; I&#39;ll be expecting updated text to review how my comments were addr=
essed.<br>
<br>
Thanks in advance for, after a new revision is posted, verifying we are not=
 missing any typographical correction; and thanks again for the thorough se=
t of editorial comments.<br>
<br>
&gt; In the meantime, you seemed to equate availability and uptime in the f=
ollowing response:<br>
&gt; &quot;Section 3.1.1 is about availability / uptime ...&quot;<br>
&gt; Is my understanding of your response is correct and you believe that a=
vailability is another term for uptime and both can be used interchangeably=
?<br>
<br>
Greg, first, =E2=80=9C/=E2=80=9C does not mean =E2=80=9Cequate=E2=80=9D. Wh=
ere did I write that those two terms are equal, and can be used interchange=
ably? Where did you conjure that understanding from? Please, again, refrain=
 for putting words that I did not write in my response.<br></blockquote><di=
v>GIM2&gt;&gt; I&#39;ve asked for clarification, nothing else. If you consi=
der &quot;availability&quot; is a different metric from uptime, then I hope=
 the draft will explain how it is measured, e.g., second, meters, packets o=
r else.</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
Second, taking half a sentence out of context is not the best way to clarif=
y understanding.<br>
<br>
Third, in regards to your comment on =E2=80=9Cavailability&quot;, I asked y=
ou this: <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &quot;If you have a specific suggestion as a re=
placement for =E2=80=9Cavailability=E2=80=99, please share.=E2=80=9D<br>
But you chose to not share a suggestion.<br></blockquote><div>GIM2&gt;&gt; =
On the contrary. In my first comments, I&#39;ve referenced the MEF document=
 that includes the definition of the availability of ME service. As I under=
stand, you&#39;ve dismissed it. Well, if you don&#39;t agree with my recomm=
endation, then you surely have an idea of your own.=C2=A0</div><blockquote =
class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px sol=
id rgb(204,204,204);padding-left:1ex">
<br>
Fourth, Section 3.1.1 explains the choice of term quite well:<br>
<a href=3D"https://tools.ietf.org/html/draft-ietf-sfc-oam-framework-06#sect=
ion-3.1.1" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html=
/draft-ietf-sfc-oam-framework-06#section-3.1.1</a><br>
Oversimplifying, somewhere in the continuum of liveness and full functional=
ity.<br></blockquote><div>GIM2&gt;&gt; If you believe that the section you&=
#39;ve referred to provides the adequate definition of the availability as =
a performance metric, then you would not be hard to provide the quote that =
explains how this metric is measured or calculated. The availability is the=
 performance metric, you agree to that?</div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204=
);padding-left:1ex">
<br>
If the WG believes that the latter is largely out of scope, we can clarify =
that and use the former (i.e., liveness).<br></blockquote><div>GIM2&gt;&gt;=
 In that case, I&#39;ll ask the same questions about &quot;liveness&quot; -=
 in what it is measured, how it is calculated.=C2=A0</div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex">
<br>
I trust that will help,<br>
<br>
Carlos.<br>
<br>
<br>
&gt; <br>
&gt; Regards,<br>
&gt; Greg<br>
&gt; <br>
&gt; Greg,<br>
&gt; <br>
&gt; Thank you for taking the time to review this important document.<br>
&gt; <br>
&gt; My analysis of your review is that the vast majority ((almost) all) of=
 your comments are editorial in nature =E2=80=94 from typos to readability =
suggestions. We will make updates to the document to address your comments =
and suggestions, and thus improve the readability of the document.<br>
&gt; <br>
&gt; A new revision will address all the comments (all typos you called out=
, editorial issues and improvements, except where there=E2=80=99s only a pe=
rsonal editorial preference) as replied to below.<br>
&gt; <br>
&gt; From the less editorial: We will also add some text to clarify &quot;B=
FD applicability&quot; and to clarity =E2=80=9CAvailability=E2=80=9D, and a=
ll others have been responded to below including whether there were referen=
ces missing (BTW we will move [ICMPv4] and [ICMPv6] as Informational as per=
 Adrian=E2=80=99s comment).<br>
&gt; <br>
&gt; Please see inline for some specific answers.<br>
&gt; <br>
&gt; On Jun 8, 2019, at 1:11 PM, Greg Mirsky &lt;<a href=3D"mailto:gregimir=
sky@gmail.com" target=3D"_blank">gregimirsky@gmail.com</a>&lt;mailto:<a hre=
f=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail.com<=
/a>&gt;&gt; wrote:<br>
&gt; <br>
&gt; Dear Authors, Jim, Joel, et al.,<br>
&gt; please find my comments to this draft below:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 2<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0An SFC layering model is introduced.=
 I couldn&#39;t find it being mentioned in section 1.1, where the scope of =
the document is defined.<br>
&gt; <br>
&gt; A model is explained, not introduced. This follows the SFC models.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0What VMx symbolize in Figure 1? To w=
hich layer of SFC they belong?<br>
&gt; <br>
&gt; Virtual Machine.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0What is being symbolized by &#39;o&#=
39; in Overlay network, Underlay network, and Link layers respectively?<br>
&gt; <br>
&gt; What Adrian referred to as =E2=80=9Clegs=E2=80=9D. We will slightly up=
date this as per Adrian=E2=80=99s comment.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0What is the purpose of Figure 1 outs=
ide Section 2<br>
&gt; <br>
&gt; I do not understand this question.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0what is the purpose of Section 2? Fo=
r only one sentence in Section 3 that states the obvious:<br>
&gt; <br>
&gt; The SFC operates at the service layer.<br>
&gt; <br>
&gt; I apologize I do no follow the meaning of your note. But, S2 explains =
the model which is used in the doc, and =E2=80=9Cobvious=E2=80=9D is in the=
 eye of the beholder. Note that IETF documents have cross functional review=
, might not be obvious to all readers.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 3<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0In &quot;testing the service functio=
ns from any SFC-aware network devices (i.e.classifiers, controllers, other =
service nodes)&quot;, what is the scope of testing expected? Testing, for e=
xample, NAT? Also, what are &quot;other service nodes&quot;? Neither RFC 76=
65 nor this draft define service nodes in SFC.<br>
&gt; <br>
&gt; Good editorial point, we can change =E2=80=9Cservice node=E2=80=9D thr=
oughout the document if it makes it easier, bu RFC 8300 does use the term =
=E2=80=9Cservice node=E2=80=9D.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0In &quot;validate the correlation be=
tween a Service Function Chain and the actual forwarding path followed by a=
 packet matching that SFC, etc.&quot;, is &quot;the actual forwarding path =
followed&quot; Rendered Service Path? If it is so, then what is validated? =
That RSP is part of SFP? Also, what &quot;etc.&quot; refers to? Anything el=
se?<br>
&gt; <br>
&gt; What is tested is the correlation. We can add RSP and remove the etc a=
s editorial comments.<br>
&gt; <br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Figure 2, SF OAM.. I can envision a =
Controller generating test packets for the specific SF, SF3 in the figure. =
But where OAM packets come from for SF3 and SF5 (line interconnecting two S=
Fs)?<br>
&gt; <br>
&gt; This figure is exemplary and ilustrative for highlighting the three de=
fined components.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 3.1.1<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0I hoped to find the definition of av=
ailability, which is a performance metric, and how it is measured in SFC OA=
M. For example, MEF defines Availability Performance in MEF 10.3 (it&#39;s =
rather lengthy to quote all, so just two sentences):<br>
&gt; <br>
&gt; Availability Performance is the percentage of time within a specified =
time interval T during which the Frame Loss Ratio is small.<br>
&gt; <br>
&gt; Availability Performance is based on Service Frame loss during a seque=
nce of consecutive small time intervals.<br>
&gt; <br>
&gt; <br>
&gt; I=E2=80=99m not sure of the relevance of the MEF comment, but solution=
s can define what they measure.<br>
&gt; <br>
&gt; If you have a specific suggestion as a replacement for =E2=80=9Cavaila=
bility=E2=80=99, please share. However, I=E2=80=99ll say that =E2=80=9Cavai=
lability=E2=80=9D is used in other RFCs as a general term.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 3.1.2<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0It opens with &quot;Second SFC OAM r=
equirement ...&quot; but I couldn&#39;t find where the first requirement wa=
s listed.<br>
&gt; <br>
&gt; Section 3.1.1 begins with =E2=80=9COne SFC OAM requirement=E2=80=9D.<b=
r>
&gt; <br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Then the text explains that the scop=
e of performance measurement of a service function component is &quot;check=
 the loss and delay induced by a specific service function&quot;. Would del=
ay variation be of interest too? Also, as noted above, availability is anot=
her performance metric that characterizes the loss ratio over a period of t=
ime. Should it be discussed in the same paragraph or this paragraph title s=
pecifically refer to loss and delay performance metrics since only these tw=
o metrics being discussed?<br>
&gt; <br>
&gt; Section 3.1.1 is about availability / uptime, Section 3.1.2. about spe=
cific PM such as delay, loss.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 3.2.1<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0The text slides into the discussion =
of path connectivity verification and tracing RSPs. These are essential OAM=
 functions but, I believe, are not part of measuring the availability of an=
 SFC.<br>
&gt; <br>
&gt; Only Section 3.1.1 is about availability. Section 3.2.1 is parallel to=
 3.1.1 and a different topic.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 3.3<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Is validation of a Classifier functi=
oning is all that is required in Classifier OAM? Where are Classifier perfo=
rmance metrics, e.g., loss ratio, delay, and availability?<br>
&gt; <br>
&gt; Are there specific OAM functions on the classifier that you believe ar=
e missing? Do you believe delay in the classifier is important? Please shar=
e some text about it.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 4<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0In the first sentence s/is/are<br>
&gt; <br>
&gt; Agreed. Thank you.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Could you kindly help me understand =
&quot;which many will be applicable to=E2=80=9D?<br>
&gt; <br>
&gt; Yes. Many functions applicable to many components. We can reword for e=
ase of clarity.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0&quot;Various SFC OAM requirements l=
isted in Section <br>
&gt; 3&lt;<a href=3D"https://tools.ietf.org/html/draft-ietf-sfc-oam-framewo=
rk-06#section-3" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.or=
g/html/draft-ietf-sfc-oam-framework-06#section-3</a>&gt;&quot;<br>
&gt;=C2=A0 I found only one explicitly called out, in Section 3.1.2. Where =
are others?<br>
&gt; <br>
&gt; Section 3.1.1 for example.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0&quot;Many of the OAM functions at d=
ifferent layers are already defined and in existence.&quot; Could you pleas=
e support this statement with references?<br>
&gt; <br>
&gt; We can do better =E2=80=94 see Section 5.1.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Besides s/service/the service/ somet=
hing else seems missing in the closing of the sentence &quot;In order to ap=
ply such OAM functions at service layer, they have to be enhanced to operat=
e a single SF/SFF to multiple SFs/SFFs in an SFC and also in multiple SFCs.=
=E2=80=9D<br>
&gt; <br>
&gt; We will fix this editorial.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 4.1<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0I think that the first sentence be w=
ould be clearer if it opens with &quot;Connectivity verification =E2=80=A6=
=E2=80=9D<br>
&gt; <br>
&gt; It would be redundant with =E2=80=9C function to verify&quot;<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0I cannot agree that &quot;Connectivi=
ty is mainly an on-demand function&quot;. If that&#39;s your view, in which=
 category you place CFM (IEEE 802.1ag)? Also, ping is not actual connectivi=
ty verification function as it doesn&#39;t detect misconnection.<br>
&gt; <br>
&gt; We can change to LSP Ping.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0In the last bullet, is it suggesting=
 to use ping as proactive CC?<br>
&gt; <br>
&gt; No.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 4.2<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0CC OAM, e.g., BFD, does not monitor =
a device but, using positioning statement from RFC 5880, &quot;path between=
 two forwarding engines, including interfaces, data link(s), and to the ext=
ent possible the forwarding engines themselves.=E2=80=9D<br>
&gt; <br>
&gt; Good point, we can remove =E2=80=9Cdevice&quot;<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0The last bullet reads awkwardly &quo=
t;Notifying the failure upon failure detection for other OAM functions to t=
ake appropriate action.&quot; Also, can other applications receive failure =
notification?<br>
&gt; <br>
&gt; We can reword if you find it confusing.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 4.3<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0I think that the first two bullets s=
hould apply to any arbitrary set of SFC elements, not only to every compone=
nt of the given SFC.<br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 4.4<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0I think that the second sentence can=
 be improved by s/measurements/performance metrics/, so that it reads &quot=
;These performance metrics could be measured pro-actively and on-demand.&qu=
ot;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Second para, first sentence. s/perfo=
rm/measure/?<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0What the third and fourth sentences =
of the second para trying to convey? What is &quot;approximation of packet =
loss&quot;? Can you define it or give the reference to the definition of th=
is performance metric?<br>
&gt; <br>
&gt; Yes, we can make these editorial suggestions above.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0The definition of a delay in SFC in =
the third para is confusing. What does it mean &quot;delay is measured from=
 time&quot;? And when the second timestamp at the egress SFF should be take=
n?<br>
&gt; <br>
&gt; Can you please provide a definition?<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Delay variation, I believe, is calcu=
lated, not measured.<br>
&gt; <br>
&gt; OK.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0What are resolution and accuracy for=
 the delay and delay variation SFC PM OAM tools are required to provide, gi=
ven that you expect to measure them for an SF? I believe that would be very=
 helpful to state in the document.<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Also, considering the scale of measu=
ring a delay introduced by an SF, what are the methods of obtaining accurat=
e ToD?<br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 5.1<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Again, regarding &quot;connectivity&=
quot; and &quot;continuity&quot;.. None of IP, MPLS (except MPLS-TP), or ov=
erlay OAM tools so far provides actual connectivity verification. If these =
terms are used interchangeably in this document, that must be clearly state=
d. Alternatively, definitions of terms must be provided, preferably with re=
ferences to well-established in the industry documents.<br>
&gt; <br>
&gt; We are using IETF nomenclatures.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Information in Table 3 is outdated. =
With SFC WG draft on Active OAM, Ping and Trace columns must be set to Yes.=
<br>
&gt; <br>
&gt; No. This table covers existing OAM Functions fully defined, and/or wit=
h running code. This include OAM functions that can actually be used (norma=
tively in documents or in practice on an actual wire).<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Why in Table 4 Netconf is not listed=
 in the Notification column?<br>
&gt; <br>
&gt; Good point! Will add.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Assuming SF and SFC have data models=
 and thus can be configured using, for example, Netconf. Why the same model=
s cannot be used for orchestration? And how certain you are that there are =
no TOSCA models for orchestration?<br>
&gt; <br>
&gt; If you know of any additional model, please share.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0What prevents an implementation of S=
F or SFC from generating syslog notification?<br>
&gt; <br>
&gt; Someone defining it and someone coding it?<br>
&gt; <br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 6.1<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0It refers only to RFC 8300 SFC NSH.<=
br>
&gt; <br>
&gt; See the last sentence of the Abstract of RFC 8300.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Any consideration is given for RFC 8=
595 An MPLS-Based Forwarding Plane for Service Function Chaining?<br>
&gt; <br>
&gt; Do you have any suggestion beyond the existing text that says that<br>
&gt;=C2=A0 =C2=A0 Any other overlay encapsulations used in future must have=
 a way to<br>
&gt;=C2=A0 =C2=A0 mark the packet as OAM packet.<br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 6.2<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0RFC 5880 has no definition for &quot=
;BFD reply packet&quot;. Please clarify.<br>
&gt; <br>
&gt; Typo. Will fix.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 6.4.1<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Without clear definition of the term=
s &quot;SFF availability&quot; and &quot;SF availability&quot; it is hard t=
o agree that ICMP can be used to measure this performance metric (see my no=
tes at the top).<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0&quot;...it can be used for basic OA=
M functions.&quot; Could you provide the reference to the document that def=
ines the list of &quot;basic OAM functions&quot;. Or provide the list itsel=
f in this draft.<br>
&gt; <br>
&gt; We will clarify these both editorially.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 6.4.2<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Applicability of S-BFD is discussed =
but not of BFD, as defined in RFC 5880. I couldn&#39;t find the explanation=
 for excluding BFD from consideration.<br>
&gt; <br>
&gt; The text already mentions BFD, but we can expand a bit.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 6.4.3<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0 =C2=A0 Without the definition of av=
ailability for this draft, the following statement is subjective, at best &=
quot;In-Situ OAM could be used with O bit set and perform SF availability, =
SFC availability of performance measurement.=E2=80=9D<br>
&gt; <br>
&gt; See above.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 6.4.4<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Clearly is missing reference to draf=
t-ietf-sfc-multilayer-oam. Surprisingly, the sectin refers to the draft tha=
t expired April 2, 2016.<br>
&gt; <br>
&gt; Not surprising, and not missing. See above.<br>
&gt; <br>
&gt;=C2=A0 After reviewing how fundamental are outstanding, in my opinion, =
questions, how numerous are problems with the text and how many statements =
are not supported by definitions or proper references, I believe that the d=
ocument cannot be published in its current form.<br>
&gt; <br>
&gt; Thank you again for taking time to review this document. See above.<br=
>
&gt; <br>
&gt; <br>
&gt; Regards,<br>
&gt; Greg<br>
&gt; <br>
&gt; <br>
&gt; On Tue, May 28, 2019 at 7:37 AM James Guichard &lt;<a href=3D"mailto:j=
ames.n.guichard@futurewei.com" target=3D"_blank">james.n.guichard@futurewei=
.com</a>&lt;mailto:<a href=3D"mailto:james.n.guichard@futurewei.com" target=
=3D"_blank">james.n.guichard@futurewei.com</a>&gt;&gt; wrote:<br>
&gt; <br>
&gt; Dear WG:<br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt; This message starts a new two week WG Last Call on advancing <br>
&gt; <a href=3D"https://datatracker.ietf.org/doc/draft-ietf-sfc-oam-framewo=
rk/" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/doc/=
draft-ietf-sfc-oam-framework/</a>&lt;<a href=3D"https://nam03.safelinks.pro=
tection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft=
-ietf-sfc-oam-framework%2F&amp;data=3D02%7C01%7Cjames.n.guichard%40futurewe=
i.com%7Ce47e5eb13f224f18c46408d6e378b2f7%7C0fee8ff2a3b240189c753a1d5591fedc=
%7C1%7C0%7C636946504868870205&amp;sdata=3DlkKvAgmKik7lkqGANQpnIvBRdbjKAqYtz=
TUdTfB9f3Y%3D&amp;reserved=3D0" rel=3D"noreferrer" target=3D"_blank">https:=
//nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatracker.i=
etf.org%2Fdoc%2Fdraft-ietf-sfc-oam-framework%2F&amp;data=3D02%7C01%7Cjames.=
n.guichard%40futurewei.com%7Ce47e5eb13f224f18c46408d6e378b2f7%7C0fee8ff2a3b=
240189c753a1d5591fedc%7C1%7C0%7C636946504868870205&amp;sdata=3DlkKvAgmKik7l=
kqGANQpnIvBRdbjKAqYtzTUdTfB9f3Y%3D&amp;reserved=3D0</a>&gt;<br>
&gt;=C2=A0 for publication as an Informational RFC.<br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt; Substantive comments and statements of support for publishing this doc=
ument should be directed to the mailing list. Editorial suggestions can be =
sent to the authors.<br>
&gt; <br>
&gt; Please let me know if there=E2=80=99s anything that was missed on this=
 reply.<br>
&gt; <br>
&gt; Thanks,<br>
&gt; <br>
&gt; Carlos.<br>
&gt; <br>
&gt; This last call will end on 11th June 2019.<br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt; Thanks!<br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt; Jim &amp; Joel<br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; sfc mailing list<br>
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From nobody Sun Jun 16 17:12:11 2019
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To: "sfc@ietf.org" <sfc@ietf.org>
From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Date: Mon, 17 Jun 2019 09:12:06 +0900
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Subject: [sfc] Regarding draft-mirsky-sfc-pmamm
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The adoption call for this document completed almost a week ago.  We 
(Jim and I) are now evaluating the feedback from the working group to 
determine the result.

This note is just to let folks know we are not ignoring the completion 
of the call for adoption.

Yours,
Joel



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To: Greg Mirsky <gregimirsky@gmail.com>
CC: "sfc-chairs@ietf.org" <sfc-chairs@ietf.org>, "gregory.mirsky@ztetx.com" <gregory.mirsky@ztetx.com>, Service Function Chaining IETF list <sfc@ietf.org>
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Mon, 17 Jun 2019 12:11:22 +0900
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To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
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Subject: Re: [sfc] Comments on draft-ietf-sfc-oam-framework
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Hi Carlos,
I believe that RFC 5880, that uses the "liveness" term technically only
three times, hardly can be characterized as the document that "introduced
"liveness". More so, RFC 5880 considers BFD, failure detection protocol, as
the mechanism to monitor liveness. BFD, being the active OAM Fault
Management protocol, is the right tool and interchangeable use of
"liveness" and "failure detection", in my view, is appropriate. As for
"availability", RFC 5880 uses the term only once.  And so, for example, RFC
8029 - one time for "availability, one time for "liveness". And these are
both active FM OAM tools. But the draft we're discussing suggests that
availability, or liveness, if you prefer, can be measured by a hybrid OAM,
i.e., in-situ OAM as a performance metric
   In-Situ OAM could be used with O bit set and perform SF availability,
   SFC availability of performance measurement.
Hence, whether it is referred to as availability or liveness and since IPPM
WG, as you've correctly have noted in your suggestion, has not yet formally
defined it, how In-Situ OAM does measure it for SF and/or SFC?

Regards,
Greg

On Mon, Jun 17, 2019 at 10:59 AM Carlos Pignataro (cpignata) <
cpignata@cisco.com> wrote:

> Hi, Greg,
>
> Now that I understand your concern, please find inline my final set of
> replies on the single remaining comment, closing this thread from my side=
.
>
> On Jun 16, 2019, at 1:21 AM, Greg Mirsky <gregimirsky@gmail.com> wrote:
>
> Hi Carlos,
> please find my followup comments in-line tagged GIM2>>.
> Looking forward to the updated draft.
>
> Regards,
> Greg
>
> On Sun, Jun 16, 2019 at 12:33 PM Carlos Pignataro (cpignata) <
> cpignata@cisco.com> wrote:
>
>> Hello, Greg,
>>
>> > On Jun 10, 2019, at 2:49 AM, gregory.mirsky@ztetx.com wrote:
>> >
>> > Hi Carlos,
>> > thank you for your expedient response to my comments.
>>
>> You are welcome.
>>
>> > I'll be expecting updated text to review how my comments were addresse=
d.
>>
>> Thanks in advance for, after a new revision is posted, verifying we are
>> not missing any typographical correction; and thanks again for the thoro=
ugh
>> set of editorial comments.
>>
>> > In the meantime, you seemed to equate availability and uptime in the
>> following response:
>> > "Section 3.1.1 is about availability / uptime ..."
>> > Is my understanding of your response is correct and you believe that
>> availability is another term for uptime and both can be used
>> interchangeably?
>>
>> Greg, first, =E2=80=9C/=E2=80=9C does not mean =E2=80=9Cequate=E2=80=9D.=
 Where did I write that those two
>> terms are equal, and can be used interchangeably? Where did you conjure
>> that understanding from? Please, again, refrain for putting words that I
>> did not write in my response.
>>
> GIM2>> I've asked for clarification, nothing else. If you consider
> "availability" is a different metric from uptime, then I hope the draft
> will explain how it is measured, e.g., second, meters, packets or else.
>
>>
>> Second, taking half a sentence out of context is not the best way to
>> clarify understanding.
>>
>> Third, in regards to your comment on =E2=80=9Cavailability", I asked you=
 this:
>>         "If you have a specific suggestion as a replacement for
>> =E2=80=9Cavailability=E2=80=99, please share.=E2=80=9D
>> But you chose to not share a suggestion.
>>
> GIM2>> On the contrary. In my first comments, I've referenced the MEF
> document that includes the definition of the availability of ME service. =
As
> I understand, you've dismissed it. Well, if you don't agree with my
> recommendation, then you surely have an idea of your own.
>
>>
>> Fourth, Section 3.1.1 explains the choice of term quite well:
>> https://tools.ietf.org/html/draft-ietf-sfc-oam-framework-06#section-3.1.=
1
>> Oversimplifying, somewhere in the continuum of liveness and full
>> functionality.
>>
> GIM2>> If you believe that the section you've referred to provides the
> adequate definition of the availability as a performance metric, then you
> would not be hard to provide the quote that explains how this metric is
> measured or calculated. The availability is the performance metric, you
> agree to that?
>
>
> Actually, this document is not defining performance metrics, nor treating
> availability as a performance metric.
>
> Consequently, comment out of scope and to me without merit.
>
> That said, we will review the usage of this term, and evaluate
> improvements (without recursing to crafting a strict metric definition on
> virtual stone).
>
>
>> If the WG believes that the latter is largely out of scope, we can
>> clarify that and use the former (i.e., liveness).
>>
> GIM2>> In that case, I'll ask the same questions about "liveness" - in
> what it is measured, how it is calculated.
>
>
> In fact, I believe the level of over-definition you are seeking as per a
> MEF document is not required nor needed in these kind of IETF documents
> defining a framework. In fact, not for many IETF documents defining
> protocols either.
>
> For example, RFC 5880 introduced =E2=80=9Cliveness=E2=80=9D, many RFCs us=
e =E2=80=9Cavailability=E2=80=9D
> and =E2=80=9Chigh availability=E2=80=9D.
>
> I recommend that, if you are looking for that definition, you can write a
> draft in IPPM, maybe citing and rationalizing from Y.1540 or elsewhere.
>
> Best,
>
> Carlos.
>
>
>> I trust that will help,
>>
>> Carlos.
>>
>>
>> >
>> > Regards,
>> > Greg
>> >
>> > Greg,
>> >
>> > Thank you for taking the time to review this important document.
>> >
>> > My analysis of your review is that the vast majority ((almost) all) of
>> your comments are editorial in nature =E2=80=94 from typos to readabilit=
y
>> suggestions. We will make updates to the document to address your commen=
ts
>> and suggestions, and thus improve the readability of the document.
>> >
>> > A new revision will address all the comments (all typos you called out=
,
>> editorial issues and improvements, except where there=E2=80=99s only a p=
ersonal
>> editorial preference) as replied to below.
>> >
>> > From the less editorial: We will also add some text to clarify "BFD
>> applicability" and to clarity =E2=80=9CAvailability=E2=80=9D, and all ot=
hers have been
>> responded to below including whether there were references missing (BTW =
we
>> will move [ICMPv4] and [ICMPv6] as Informational as per Adrian=E2=80=99s=
 comment).
>> >
>> > Please see inline for some specific answers.
>> >
>> > On Jun 8, 2019, at 1:11 PM, Greg Mirsky <gregimirsky@gmail.com<mailto:
>> gregimirsky@gmail.com>> wrote:
>> >
>> > Dear Authors, Jim, Joel, et al.,
>> > please find my comments to this draft below:
>> >
>> >   *   Section 2
>> >      *   An SFC layering model is introduced. I couldn't find it being
>> mentioned in section 1.1, where the scope of the document is defined.
>> >
>> > A model is explained, not introduced. This follows the SFC models.
>> >
>> >      *   What VMx symbolize in Figure 1? To which layer of SFC they
>> belong?
>> >
>> > Virtual Machine.
>> >
>> >      *   What is being symbolized by 'o' in Overlay network, Underlay
>> network, and Link layers respectively?
>> >
>> > What Adrian referred to as =E2=80=9Clegs=E2=80=9D. We will slightly up=
date this as per
>> Adrian=E2=80=99s comment.
>> >
>> >      *   What is the purpose of Figure 1 outside Section 2
>> >
>> > I do not understand this question.
>> >
>> >      *   what is the purpose of Section 2? For only one sentence in
>> Section 3 that states the obvious:
>> >
>> > The SFC operates at the service layer.
>> >
>> > I apologize I do no follow the meaning of your note. But, S2 explains
>> the model which is used in the doc, and =E2=80=9Cobvious=E2=80=9D is in =
the eye of the
>> beholder. Note that IETF documents have cross functional review, might n=
ot
>> be obvious to all readers.
>> >
>> >   *   Section 3
>> >      *   In "testing the service functions from any SFC-aware network
>> devices (i.e.classifiers, controllers, other service nodes)", what is th=
e
>> scope of testing expected? Testing, for example, NAT? Also, what are "ot=
her
>> service nodes"? Neither RFC 7665 nor this draft define service nodes in =
SFC.
>> >
>> > Good editorial point, we can change =E2=80=9Cservice node=E2=80=9D thr=
oughout the
>> document if it makes it easier, bu RFC 8300 does use the term =E2=80=9Cs=
ervice
>> node=E2=80=9D.
>> >
>> >      *   In "validate the correlation between a Service Function Chain
>> and the actual forwarding path followed by a packet matching that SFC,
>> etc.", is "the actual forwarding path followed" Rendered Service Path? I=
f
>> it is so, then what is validated? That RSP is part of SFP? Also, what
>> "etc." refers to? Anything else?
>> >
>> > What is tested is the correlation. We can add RSP and remove the etc a=
s
>> editorial comments.
>> >
>> >
>> >      *   Figure 2, SF OAM.. I can envision a Controller generating tes=
t
>> packets for the specific SF, SF3 in the figure. But where OAM packets co=
me
>> from for SF3 and SF5 (line interconnecting two SFs)?
>> >
>> > This figure is exemplary and ilustrative for highlighting the three
>> defined components.
>> >
>> >   *   Section 3.1.1
>> >      *   I hoped to find the definition of availability, which is a
>> performance metric, and how it is measured in SFC OAM. For example, MEF
>> defines Availability Performance in MEF 10.3 (it's rather lengthy to quo=
te
>> all, so just two sentences):
>> >
>> > Availability Performance is the percentage of time within a specified
>> time interval T during which the Frame Loss Ratio is small.
>> >
>> > Availability Performance is based on Service Frame loss during a
>> sequence of consecutive small time intervals.
>> >
>> >
>> > I=E2=80=99m not sure of the relevance of the MEF comment, but solution=
s can
>> define what they measure.
>> >
>> > If you have a specific suggestion as a replacement for =E2=80=9Cavaila=
bility=E2=80=99,
>> please share. However, I=E2=80=99ll say that =E2=80=9Cavailability=E2=80=
=9D is used in other RFCs
>> as a general term.
>> >
>> >   *   Section 3.1.2
>> >      *   It opens with "Second SFC OAM requirement ..." but I couldn't
>> find where the first requirement was listed.
>> >
>> > Section 3.1.1 begins with =E2=80=9COne SFC OAM requirement=E2=80=9D.
>> >
>> >
>> >      *   Then the text explains that the scope of performance
>> measurement of a service function component is "check the loss and delay
>> induced by a specific service function". Would delay variation be of
>> interest too? Also, as noted above, availability is another performance
>> metric that characterizes the loss ratio over a period of time. Should i=
t
>> be discussed in the same paragraph or this paragraph title specifically
>> refer to loss and delay performance metrics since only these two metrics
>> being discussed?
>> >
>> > Section 3.1.1 is about availability / uptime, Section 3.1.2. about
>> specific PM such as delay, loss.
>> >
>> >   *   Section 3.2.1
>> >      *   The text slides into the discussion of path connectivity
>> verification and tracing RSPs. These are essential OAM functions but, I
>> believe, are not part of measuring the availability of an SFC.
>> >
>> > Only Section 3.1.1 is about availability. Section 3.2.1 is parallel to
>> 3.1.1 and a different topic.
>> >
>> >   *   Section 3.3
>> >      *   Is validation of a Classifier functioning is all that is
>> required in Classifier OAM? Where are Classifier performance metrics, e.=
g.,
>> loss ratio, delay, and availability?
>> >
>> > Are there specific OAM functions on the classifier that you believe ar=
e
>> missing? Do you believe delay in the classifier is important? Please sha=
re
>> some text about it.
>> >
>> >   *   Section 4
>> >      *   In the first sentence s/is/are
>> >
>> > Agreed. Thank you.
>> >
>> >      *   Could you kindly help me understand "which many will be
>> applicable to=E2=80=9D?
>> >
>> > Yes. Many functions applicable to many components. We can reword for
>> ease of clarity.
>> >
>> >      *   "Various SFC OAM requirements listed in Section
>> > 3<https://tools.ietf.org/html/draft-ietf-sfc-oam-framework-06#section-=
3
>> >"
>> >  I found only one explicitly called out, in Section 3.1.2. Where are
>> others?
>> >
>> > Section 3.1.1 for example.
>> >
>> >      *   "Many of the OAM functions at different layers are already
>> defined and in existence." Could you please support this statement with
>> references?
>> >
>> > We can do better =E2=80=94 see Section 5.1.
>> >
>> >      *   Besides s/service/the service/ something else seems missing i=
n
>> the closing of the sentence "In order to apply such OAM functions at
>> service layer, they have to be enhanced to operate a single SF/SFF to
>> multiple SFs/SFFs in an SFC and also in multiple SFCs.=E2=80=9D
>> >
>> > We will fix this editorial.
>> >
>> >   *   Section 4.1
>> >      *   I think that the first sentence be would be clearer if it
>> opens with "Connectivity verification =E2=80=A6=E2=80=9D
>> >
>> > It would be redundant with =E2=80=9C function to verify"
>> >
>> >      *   I cannot agree that "Connectivity is mainly an on-demand
>> function". If that's your view, in which category you place CFM (IEEE
>> 802.1ag)? Also, ping is not actual connectivity verification function as=
 it
>> doesn't detect misconnection.
>> >
>> > We can change to LSP Ping.
>> >
>> >      *   In the last bullet, is it suggesting to use ping as proactive
>> CC?
>> >
>> > No.
>> >
>> >   *   Section 4.2
>> >      *   CC OAM, e.g., BFD, does not monitor a device but, using
>> positioning statement from RFC 5880, "path between two forwarding engine=
s,
>> including interfaces, data link(s), and to the extent possible the
>> forwarding engines themselves.=E2=80=9D
>> >
>> > Good point, we can remove =E2=80=9Cdevice"
>> >
>> >      *   The last bullet reads awkwardly "Notifying the failure upon
>> failure detection for other OAM functions to take appropriate action."
>> Also, can other applications receive failure notification?
>> >
>> > We can reword if you find it confusing.
>> >
>> >   *   Section 4.3
>> >      *   I think that the first two bullets should apply to any
>> arbitrary set of SFC elements, not only to every component of the given =
SFC.
>> >   *   Section 4.4
>> >      *   I think that the second sentence can be improved by
>> s/measurements/performance metrics/, so that it reads "These performance
>> metrics could be measured pro-actively and on-demand."
>> >      *   Second para, first sentence. s/perform/measure/?
>> >      *   What the third and fourth sentences of the second para trying
>> to convey? What is "approximation of packet loss"? Can you define it or
>> give the reference to the definition of this performance metric?
>> >
>> > Yes, we can make these editorial suggestions above.
>> >
>> >      *   The definition of a delay in SFC in the third para is
>> confusing. What does it mean "delay is measured from time"? And when the
>> second timestamp at the egress SFF should be taken?
>> >
>> > Can you please provide a definition?
>> >
>> >      *   Delay variation, I believe, is calculated, not measured.
>> >
>> > OK.
>> >
>> >      *   What are resolution and accuracy for the delay and delay
>> variation SFC PM OAM tools are required to provide, given that you expec=
t
>> to measure them for an SF? I believe that would be very helpful to state=
 in
>> the document.
>> >      *   Also, considering the scale of measuring a delay introduced b=
y
>> an SF, what are the methods of obtaining accurate ToD?
>> >   *   Section 5.1
>> >      *   Again, regarding "connectivity" and "continuity".. None of IP=
,
>> MPLS (except MPLS-TP), or overlay OAM tools so far provides actual
>> connectivity verification. If these terms are used interchangeably in th=
is
>> document, that must be clearly stated. Alternatively, definitions of ter=
ms
>> must be provided, preferably with references to well-established in the
>> industry documents.
>> >
>> > We are using IETF nomenclatures.
>> >
>> >      *   Information in Table 3 is outdated. With SFC WG draft on
>> Active OAM, Ping and Trace columns must be set to Yes.
>> >
>> > No. This table covers existing OAM Functions fully defined, and/or wit=
h
>> running code. This include OAM functions that can actually be used
>> (normatively in documents or in practice on an actual wire).
>> >
>> >      *   Why in Table 4 Netconf is not listed in the Notification
>> column?
>> >
>> > Good point! Will add.
>> >
>> >      *   Assuming SF and SFC have data models and thus can be
>> configured using, for example, Netconf. Why the same models cannot be us=
ed
>> for orchestration? And how certain you are that there are no TOSCA model=
s
>> for orchestration?
>> >
>> > If you know of any additional model, please share.
>> >
>> >      *   What prevents an implementation of SF or SFC from generating
>> syslog notification?
>> >
>> > Someone defining it and someone coding it?
>> >
>> >   *   Section 6.1
>> >      *   It refers only to RFC 8300 SFC NSH.
>> >
>> > See the last sentence of the Abstract of RFC 8300.
>> >
>> >      *   Any consideration is given for RFC 8595 An MPLS-Based
>> Forwarding Plane for Service Function Chaining?
>> >
>> > Do you have any suggestion beyond the existing text that says that
>> >    Any other overlay encapsulations used in future must have a way to
>> >    mark the packet as OAM packet.
>> >
>> >
>> >
>> >   *   Section 6.2
>> >      *   RFC 5880 has no definition for "BFD reply packet". Please
>> clarify.
>> >
>> > Typo. Will fix.
>> >
>> >   *   Section 6.4.1
>> >      *   Without clear definition of the terms "SFF availability" and
>> "SF availability" it is hard to agree that ICMP can be used to measure t=
his
>> performance metric (see my notes at the top).
>> >      *   "...it can be used for basic OAM functions." Could you provid=
e
>> the reference to the document that defines the list of "basic OAM
>> functions". Or provide the list itself in this draft.
>> >
>> > We will clarify these both editorially.
>> >
>> >   *   Section 6.4.2
>> >      *   Applicability of S-BFD is discussed but not of BFD, as define=
d
>> in RFC 5880. I couldn't find the explanation for excluding BFD from
>> consideration.
>> >
>> > The text already mentions BFD, but we can expand a bit.
>> >
>> >   *   Section 6.4.3
>> >      *      Without the definition of availability for this draft, the
>> following statement is subjective, at best "In-Situ OAM could be used wi=
th
>> O bit set and perform SF availability, SFC availability of performance
>> measurement.=E2=80=9D
>> >
>> > See above.
>> >
>> >   *   Section 6.4.4
>> >      *   Clearly is missing reference to draft-ietf-sfc-multilayer-oam=
.
>> Surprisingly, the sectin refers to the draft that expired April 2, 2016.
>> >
>> > Not surprising, and not missing. See above.
>> >
>> >  After reviewing how fundamental are outstanding, in my opinion,
>> questions, how numerous are problems with the text and how many statemen=
ts
>> are not supported by definitions or proper references, I believe that th=
e
>> document cannot be published in its current form.
>> >
>> > Thank you again for taking time to review this document. See above.
>> >
>> >
>> > Regards,
>> > Greg
>> >
>> >
>> > On Tue, May 28, 2019 at 7:37 AM James Guichard <
>> james.n.guichard@futurewei..com <james.n.guichard@futurewei.com><mailto:
>> james.n.guichard@futurewei.com>> wrote:
>> >
>> > Dear WG:
>> >
>> >
>> >
>> > This message starts a new two week WG Last Call on advancing
>> > https://datatracker.ietf.org/doc/draft-ietf-sfc-oam-framework/<
>> https://nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdata=
tracker.ietf.org%2Fdoc%2Fdraft-ietf-sfc-oam-framework%2F&data=3D02%7C01%7Cj=
ames.n.guichard%40futurewei.com%7Ce47e5eb13f224f18c46408d6e378b2f7%7C0fee8f=
f2a3b240189c753a1d5591fedc%7C1%7C0%7C636946504868870205&sdata=3DlkKvAgmKik7=
lkqGANQpnIvBRdbjKAqYtzTUdTfB9f3Y%3D&reserved=3D0
>> >
>> >  for publication as an Informational RFC.
>> >
>> >
>> >
>> > Substantive comments and statements of support for publishing this
>> document should be directed to the mailing list. Editorial suggestions c=
an
>> be sent to the authors.
>> >
>> > Please let me know if there=E2=80=99s anything that was missed on this=
 reply.
>> >
>> > Thanks,
>> >
>> > Carlos.
>> >
>> > This last call will end on 11th June 2019.
>> >
>> >
>> >
>> > Thanks!
>> >
>> >
>> >
>> > Jim & Joel
>> >
>> >
>> >
>> >
>> > _______________________________________________
>> > 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
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > Greg Mirsky
>> >
>> >
>> >
>> > Sr. Standardization Expert
>> > =E9=A2=84=E7=A0=94=E6=A0=87=E5=87=86=E9=83=A8/=E6=9C=89=E7=BA=BF=E7=A0=
=94=E7=A9=B6=E9=99=A2/=E6=9C=89=E7=BA=BF=E4=BA=A7=E5=93=81=E7=BB=8F=E8=90=
=A5=E9=83=A8 Standard Preresearch Dept./Wireline Product R&D
>> Institute/Wireline Product Operation Division
>> >
>> >
>> >
>> >
>> > <9ae3e214c17d49ed935d87c674ba3ee2.jpg>
>> <24242e5637af428891c4db731e7765ad.jpg>
>> > E: gregory.mirsky@ztetx.com
>> > www.zte.com.cn
>>
>> _______________________________________________
>> 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
>
>
>

--00000000000076983d058b7c5a5f
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Carlos,<div>I believe that RFC 5880, that uses the &quo=
t;liveness&quot; term technically only three times, hardly can be character=
ized as the document that &quot;introduced &quot;liveness&quot;. More so, R=
FC 5880 considers BFD, failure detection protocol, as the mechanism to moni=
tor liveness. BFD, being the active OAM Fault Management protocol, is the r=
ight tool and interchangeable use of &quot;liveness&quot; and &quot;failure=
 detection&quot;, in my view, is appropriate. As for &quot;availability&quo=
t;, RFC 5880 uses the term only once.=C2=A0 And so, for example, RFC 8029 -=
 one time for &quot;availability, one time for &quot;liveness&quot;. And th=
ese are both active FM OAM tools. But the draft we&#39;re discussing sugges=
ts that availability, or liveness, if you prefer, can be measured by a hybr=
id OAM, i.e., in-situ OAM as a performance metric</div><div>=C2=A0 =C2=A0In=
-Situ OAM could be used with O bit set and perform SF availability,<br>=C2=
=A0 =C2=A0SFC availability of performance measurement.<br></div><div>Hence,=
 whether it is referred to as availability or liveness and since IPPM WG, a=
s you&#39;ve correctly have noted in your suggestion, has not yet formally =
defined it, how In-Situ OAM does measure it for SF and/or SFC?</div><div><b=
r></div><div>Regards,</div><div>Greg</div></div><br><div class=3D"gmail_quo=
te"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Jun 17, 2019 at 10:59 AM =
Carlos Pignataro (cpignata) &lt;<a href=3D"mailto:cpignata@cisco.com">cpign=
ata@cisco.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddi=
ng-left:1ex">



<div style=3D"overflow-wrap: break-word;">
Hi, Greg,
<div><br>
</div>
<div>
<div>Now that I understand your concern, please find inline my final set of=
 replies on the single remaining comment, closing this thread from my side.=
</div>
</div>
<div>
<div><br>
<blockquote type=3D"cite">
<div>On Jun 16, 2019, at 1:21 AM, Greg Mirsky &lt;<a href=3D"mailto:gregimi=
rsky@gmail.com" target=3D"_blank">gregimirsky@gmail.com</a>&gt; wrote:</div=
>
<br class=3D"gmail-m_5871177670165181250Apple-interchange-newline">
<div>
<div dir=3D"ltr" style=3D"font-family:Helvetica;font-size:12px;font-style:n=
ormal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;tex=
t-align:start;text-indent:0px;text-transform:none;white-space:normal;word-s=
pacing:0px;text-decoration:none">
<div>Hi Carlos,</div>
<div>please find my followup comments in-line tagged GIM2&gt;&gt;.</div>
<div>Looking forward to the updated draft.</div>
<div><br>
</div>
<div>Regards,</div>
<div>Greg</div>
<br>
<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Sun, Jun 16, 2019 at 12:33 PM Carl=
os Pignataro (cpignata) &lt;<a href=3D"mailto:cpignata@cisco.com" target=3D=
"_blank">cpignata@cisco.com</a>&gt; wrote:<br>
</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
Hello, Greg,<br>
<br>
&gt; On Jun 10, 2019, at 2:49 AM,<span class=3D"gmail-m_5871177670165181250=
Apple-converted-space">=C2=A0</span><a href=3D"mailto:gregory.mirsky@ztetx.=
com" target=3D"_blank">gregory.mirsky@ztetx.com</a><span class=3D"gmail-m_5=
871177670165181250Apple-converted-space">=C2=A0</span>wrote:<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Hi Carlos,<br>
&gt; thank you for your expedient response to my comments.<br>
<br>
You are welcome.<br>
<br>
&gt; I&#39;ll be expecting updated text to review how my comments were addr=
essed.<br>
<br>
Thanks in advance for, after a new revision is posted, verifying we are not=
 missing any typographical correction; and thanks again for the thorough se=
t of editorial comments.<br>
<br>
&gt; In the meantime, you seemed to equate availability and uptime in the f=
ollowing response:<br>
&gt; &quot;Section 3.1.1 is about availability / uptime ...&quot;<br>
&gt; Is my understanding of your response is correct and you believe that a=
vailability is another term for uptime and both can be used interchangeably=
?<br>
<br>
Greg, first, =E2=80=9C/=E2=80=9C does not mean =E2=80=9Cequate=E2=80=9D. Wh=
ere did I write that those two terms are equal, and can be used interchange=
ably? Where did you conjure that understanding from? Please, again, refrain=
 for putting words that I did not write in my response.<br>
</blockquote>
<div>GIM2&gt;&gt; I&#39;ve asked for clarification, nothing else. If you co=
nsider &quot;availability&quot; is a different metric from uptime, then I h=
ope the draft will explain how it is measured, e.g., second, meters, packet=
s or else.</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
Second, taking half a sentence out of context is not the best way to clarif=
y understanding.<br>
<br>
Third, in regards to your comment on =E2=80=9Cavailability&quot;, I asked y=
ou this:<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=
=C2=A0</span><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &quot;If you have a specific suggestion as a re=
placement for =E2=80=9Cavailability=E2=80=99, please share.=E2=80=9D<br>
But you chose to not share a suggestion.<br>
</blockquote>
<div>GIM2&gt;&gt; On the contrary. In my first comments, I&#39;ve reference=
d the MEF document that includes the definition of the availability of ME s=
ervice. As I understand, you&#39;ve dismissed it. Well, if you don&#39;t ag=
ree with my recommendation, then you surely
 have an idea of your own.=C2=A0</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
Fourth, Section 3.1.1 explains the choice of term quite well:<br>
<a href=3D"https://tools.ietf.org/html/draft-ietf-sfc-oam-framework-06#sect=
ion-3.1.1" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html=
/draft-ietf-sfc-oam-framework-06#section-3.1.1</a><br>
Oversimplifying, somewhere in the continuum of liveness and full functional=
ity.<br>
</blockquote>
<div>GIM2&gt;&gt; If you believe that the section you&#39;ve referred to pr=
ovides the adequate definition of the availability as a performance metric,=
 then you would not be hard to provide the quote that explains how this met=
ric is measured or calculated. The
 availability is the performance metric, you agree to that?</div>
</div>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>Actually, this document is not defining performance metrics, nor treat=
ing availability as a performance metric.</div>
<div><br>
</div>
<div>Consequently, comment out of scope and to me without merit.</div>
<div><br>
</div>
<div>That said, we will review the usage of this term, and evaluate improve=
ments (without recursing to crafting a strict metric definition on virtual =
stone).</div>
<br>
<blockquote type=3D"cite">
<div>
<div dir=3D"ltr" style=3D"font-family:Helvetica;font-size:12px;font-style:n=
ormal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;tex=
t-align:start;text-indent:0px;text-transform:none;white-space:normal;word-s=
pacing:0px;text-decoration:none">
<div class=3D"gmail_quote">
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
If the WG believes that the latter is largely out of scope, we can clarify =
that and use the former (i.e., liveness).<br>
</blockquote>
<div>GIM2&gt;&gt; In that case, I&#39;ll ask the same questions about &quot=
;liveness&quot; - in what it is measured, how it is calculated.=C2=A0</div>
</div>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>In fact, I believe the level of over-definition you are seeking as per=
 a MEF document is not required nor needed in these kind of IETF documents =
defining a framework. In fact, not for many IETF documents defining protoco=
ls either.</div>
<div><br>
</div>
<div>For example, RFC 5880 introduced =E2=80=9Cliveness=E2=80=9D, many RFCs=
 use =E2=80=9Cavailability=E2=80=9D and =E2=80=9Chigh availability=E2=80=9D=
.</div>
<div><br>
</div>
<div>I recommend that, if you are looking for that definition, you can writ=
e a draft in IPPM, maybe citing and rationalizing from=C2=A0Y.1540 or elsew=
here.</div>
<div><br>
</div>
<div>Best,</div>
<div><br>
</div>
<div>Carlos.</div>
<br>
<blockquote type=3D"cite">
<div>
<div dir=3D"ltr" style=3D"font-family:Helvetica;font-size:12px;font-style:n=
ormal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;tex=
t-align:start;text-indent:0px;text-transform:none;white-space:normal;word-s=
pacing:0px;text-decoration:none">
<div class=3D"gmail_quote">
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
I trust that will help,<br>
<br>
Carlos.<br>
<br>
<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Regards,<br>
&gt; Greg<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Greg,<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Thank you for taking the time to review this important document.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; My analysis of your review is that the vast majority ((almost) all) of=
 your comments are editorial in nature =E2=80=94 from typos to readability =
suggestions. We will make updates to the document to address your comments =
and suggestions, and thus improve the readability
 of the document.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; A new revision will address all the comments (all typos you called out=
, editorial issues and improvements, except where there=E2=80=99s only a pe=
rsonal editorial preference) as replied to below.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; From the less editorial: We will also add some text to clarify &quot;B=
FD applicability&quot; and to clarity =E2=80=9CAvailability=E2=80=9D, and a=
ll others have been responded to below including whether there were referen=
ces missing (BTW we will move [ICMPv4] and [ICMPv6] as Informational
 as per Adrian=E2=80=99s comment).<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Please see inline for some specific answers.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; On Jun 8, 2019, at 1:11 PM, Greg Mirsky &lt;<a href=3D"mailto:gregimir=
sky@gmail.com" target=3D"_blank">gregimirsky@gmail.com</a>&lt;mailto:<a hre=
f=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail.com<=
/a>&gt;&gt; wrote:<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Dear Authors, Jim, Joel, et al.,<br>
&gt; please find my comments to this draft below:<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 2<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0An SFC layering model is introduced.=
 I couldn&#39;t find it being mentioned in section 1.1, where the scope of =
the document is defined.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; A model is explained, not introduced. This follows the SFC models.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0What VMx symbolize in Figure 1? To w=
hich layer of SFC they belong?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Virtual Machine.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0What is being symbolized by &#39;o&#=
39; in Overlay network, Underlay network, and Link layers respectively?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; What Adrian referred to as =E2=80=9Clegs=E2=80=9D. We will slightly up=
date this as per Adrian=E2=80=99s comment.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0What is the purpose of Figure 1 outs=
ide Section 2<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; I do not understand this question.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0what is the purpose of Section 2? Fo=
r only one sentence in Section 3 that states the obvious:<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; The SFC operates at the service layer.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; I apologize I do no follow the meaning of your note. But, S2 explains =
the model which is used in the doc, and =E2=80=9Cobvious=E2=80=9D is in the=
 eye of the beholder. Note that IETF documents have cross functional review=
, might not be obvious to all readers.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 3<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0In &quot;testing the service functio=
ns from any SFC-aware network devices (i.e.classifiers, controllers, other =
service nodes)&quot;, what is the scope of testing expected? Testing, for e=
xample, NAT? Also, what are &quot;other service nodes&quot;? Neither RFC 76=
65 nor
 this draft define service nodes in SFC.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Good editorial point, we can change =E2=80=9Cservice node=E2=80=9D thr=
oughout the document if it makes it easier, bu RFC 8300 does use the term =
=E2=80=9Cservice node=E2=80=9D.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0In &quot;validate the correlation be=
tween a Service Function Chain and the actual forwarding path followed by a=
 packet matching that SFC, etc.&quot;, is &quot;the actual forwarding path =
followed&quot; Rendered Service Path? If it is so, then what is validated? =
That
 RSP is part of SFP? Also, what &quot;etc.&quot; refers to? Anything else?<=
br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; What is tested is the correlation. We can add RSP and remove the etc a=
s editorial comments.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Figure 2, SF OAM.. I can envision a =
Controller generating test packets for the specific SF, SF3 in the figure. =
But where OAM packets come from for SF3 and SF5 (line interconnecting two S=
Fs)?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; This figure is exemplary and ilustrative for highlighting the three de=
fined components.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 3.1.1<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0I hoped to find the definition of av=
ailability, which is a performance metric, and how it is measured in SFC OA=
M. For example, MEF defines Availability Performance in MEF 10.3 (it&#39;s =
rather lengthy to quote all, so just two sentences):<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Availability Performance is the percentage of time within a specified =
time interval T during which the Frame Loss Ratio is small.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Availability Performance is based on Service Frame loss during a seque=
nce of consecutive small time intervals.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; I=E2=80=99m not sure of the relevance of the MEF comment, but solution=
s can define what they measure.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; If you have a specific suggestion as a replacement for =E2=80=9Cavaila=
bility=E2=80=99, please share. However, I=E2=80=99ll say that =E2=80=9Cavai=
lability=E2=80=9D is used in other RFCs as a general term.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 3.1.2<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0It opens with &quot;Second SFC OAM r=
equirement ...&quot; but I couldn&#39;t find where the first requirement wa=
s listed.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Section 3.1.1 begins with =E2=80=9COne SFC OAM requirement=E2=80=9D.<b=
r>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Then the text explains that the scop=
e of performance measurement of a service function component is &quot;check=
 the loss and delay induced by a specific service function&quot;. Would del=
ay variation be of interest too? Also, as noted above, availability is
 another performance metric that characterizes the loss ratio over a period=
 of time. Should it be discussed in the same paragraph or this paragraph ti=
tle specifically refer to loss and delay performance metrics since only the=
se two metrics being discussed?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Section 3.1.1 is about availability / uptime, Section 3.1.2. about spe=
cific PM such as delay, loss.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 3.2.1<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0The text slides into the discussion =
of path connectivity verification and tracing RSPs. These are essential OAM=
 functions but, I believe, are not part of measuring the availability of an=
 SFC.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Only Section 3.1.1 is about availability. Section 3.2.1 is parallel to=
 3.1.1 and a different topic.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 3.3<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Is validation of a Classifier functi=
oning is all that is required in Classifier OAM? Where are Classifier perfo=
rmance metrics, e.g., loss ratio, delay, and availability?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Are there specific OAM functions on the classifier that you believe ar=
e missing? Do you believe delay in the classifier is important? Please shar=
e some text about it.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 4<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0In the first sentence s/is/are<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Agreed. Thank you.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Could you kindly help me understand =
&quot;which many will be applicable to=E2=80=9D?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Yes. Many functions applicable to many components. We can reword for e=
ase of clarity.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0&quot;Various SFC OAM requirements l=
isted in Section<span class=3D"gmail-m_5871177670165181250Apple-converted-s=
pace">=C2=A0</span><br>
&gt; 3&lt;<a href=3D"https://tools.ietf.org/html/draft-ietf-sfc-oam-framewo=
rk-06#section-3" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.or=
g/html/draft-ietf-sfc-oam-framework-06#section-3</a>&gt;&quot;<br>
&gt;=C2=A0 I found only one explicitly called out, in Section 3.1.2. Where =
are others?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Section 3.1.1 for example.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0&quot;Many of the OAM functions at d=
ifferent layers are already defined and in existence.&quot; Could you pleas=
e support this statement with references?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; We can do better =E2=80=94 see Section 5.1.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Besides s/service/the service/ somet=
hing else seems missing in the closing of the sentence &quot;In order to ap=
ply such OAM functions at service layer, they have to be enhanced to operat=
e a single SF/SFF to multiple SFs/SFFs in an SFC and also in multiple
 SFCs.=E2=80=9D<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; We will fix this editorial.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 4.1<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0I think that the first sentence be w=
ould be clearer if it opens with &quot;Connectivity verification =E2=80=A6=
=E2=80=9D<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; It would be redundant with =E2=80=9C function to verify&quot;<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0I cannot agree that &quot;Connectivi=
ty is mainly an on-demand function&quot;. If that&#39;s your view, in which=
 category you place CFM (IEEE 802.1ag)? Also, ping is not actual connectivi=
ty verification function as it doesn&#39;t detect misconnection.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; We can change to LSP Ping.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0In the last bullet, is it suggesting=
 to use ping as proactive CC?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; No.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 4.2<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0CC OAM, e.g., BFD, does not monitor =
a device but, using positioning statement from RFC 5880, &quot;path between=
 two forwarding engines, including interfaces, data link(s), and to the ext=
ent possible the forwarding engines themselves.=E2=80=9D<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Good point, we can remove =E2=80=9Cdevice&quot;<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0The last bullet reads awkwardly &quo=
t;Notifying the failure upon failure detection for other OAM functions to t=
ake appropriate action.&quot; Also, can other applications receive failure =
notification?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; We can reword if you find it confusing.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 4.3<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0I think that the first two bullets s=
hould apply to any arbitrary set of SFC elements, not only to every compone=
nt of the given SFC.<br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 4.4<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0I think that the second sentence can=
 be improved by s/measurements/performance metrics/, so that it reads &quot=
;These performance metrics could be measured pro-actively and on-demand.&qu=
ot;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Second para, first sentence. s/perfo=
rm/measure/?<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0What the third and fourth sentences =
of the second para trying to convey? What is &quot;approximation of packet =
loss&quot;? Can you define it or give the reference to the definition of th=
is performance metric?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Yes, we can make these editorial suggestions above.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0The definition of a delay in SFC in =
the third para is confusing. What does it mean &quot;delay is measured from=
 time&quot;? And when the second timestamp at the egress SFF should be take=
n?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Can you please provide a definition?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Delay variation, I believe, is calcu=
lated, not measured.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; OK.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0What are resolution and accuracy for=
 the delay and delay variation SFC PM OAM tools are required to provide, gi=
ven that you expect to measure them for an SF? I believe that would be very=
 helpful to state in the document.<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Also, considering the scale of measu=
ring a delay introduced by an SF, what are the methods of obtaining accurat=
e ToD?<br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 5.1<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Again, regarding &quot;connectivity&=
quot; and &quot;continuity&quot;.. None of IP, MPLS (except MPLS-TP), or ov=
erlay OAM tools so far provides actual connectivity verification. If these =
terms are used interchangeably in this document, that must be clearly state=
d. Alternatively,
 definitions of terms must be provided, preferably with references to well-=
established in the industry documents.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; We are using IETF nomenclatures.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Information in Table 3 is outdated. =
With SFC WG draft on Active OAM, Ping and Trace columns must be set to Yes.=
<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; No. This table covers existing OAM Functions fully defined, and/or wit=
h running code. This include OAM functions that can actually be used (norma=
tively in documents or in practice on an actual wire).<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Why in Table 4 Netconf is not listed=
 in the Notification column?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Good point! Will add.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Assuming SF and SFC have data models=
 and thus can be configured using, for example, Netconf. Why the same model=
s cannot be used for orchestration? And how certain you are that there are =
no TOSCA models for orchestration?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; If you know of any additional model, please share.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0What prevents an implementation of S=
F or SFC from generating syslog notification?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Someone defining it and someone coding it?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 6.1<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0It refers only to RFC 8300 SFC NSH.<=
br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; See the last sentence of the Abstract of RFC 8300.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Any consideration is given for RFC 8=
595 An MPLS-Based Forwarding Plane for Service Function Chaining?<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Do you have any suggestion beyond the existing text that says that<br>
&gt;=C2=A0 =C2=A0 Any other overlay encapsulations used in future must have=
 a way to<br>
&gt;=C2=A0 =C2=A0 mark the packet as OAM packet.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 6.2<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0RFC 5880 has no definition for &quot=
;BFD reply packet&quot;. Please clarify.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Typo. Will fix.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 6.4.1<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Without clear definition of the term=
s &quot;SFF availability&quot; and &quot;SF availability&quot; it is hard t=
o agree that ICMP can be used to measure this performance metric (see my no=
tes at the top).<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0&quot;...it can be used for basic OA=
M functions.&quot; Could you provide the reference to the document that def=
ines the list of &quot;basic OAM functions&quot;. Or provide the list itsel=
f in this draft.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; We will clarify these both editorially.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 6.4.2<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Applicability of S-BFD is discussed =
but not of BFD, as defined in RFC 5880. I couldn&#39;t find the explanation=
 for excluding BFD from consideration.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; The text already mentions BFD, but we can expand a bit.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 6.4.3<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0 =C2=A0 Without the definition of av=
ailability for this draft, the following statement is subjective, at best &=
quot;In-Situ OAM could be used with O bit set and perform SF availability, =
SFC availability of performance measurement.=E2=80=9D<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; See above.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 =C2=A0*=C2=A0 =C2=A0Section 6.4.4<br>
&gt;=C2=A0 =C2=A0 =C2=A0 *=C2=A0 =C2=A0Clearly is missing reference to draf=
t-ietf-sfc-multilayer-oam. Surprisingly, the sectin refers to the draft tha=
t expired April 2, 2016.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Not surprising, and not missing. See above.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;=C2=A0 After reviewing how fundamental are outstanding, in my opinion, =
questions, how numerous are problems with the text and how many statements =
are not supported by definitions or proper references, I believe that the d=
ocument cannot be published in its current
 form.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Thank you again for taking time to review this document. See above.<br=
>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Regards,<br>
&gt; Greg<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; On Tue, May 28, 2019 at 7:37 AM James Guichard &lt;<a href=3D"mailto:j=
ames.n.guichard@futurewei.com" target=3D"_blank">james.n.guichard@futurewei=
..com</a>&lt;mailto:<a href=3D"mailto:james.n.guichard@futurewei.com" targe=
t=3D"_blank">james.n.guichard@futurewei.com</a>&gt;&gt;
 wrote:<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Dear WG:<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; This message starts a new two week WG Last Call on advancing<span clas=
s=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><a href=3D"https://datatracker.ietf.org/doc/draft-ietf-sfc-oam-frame=
work/" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/do=
c/draft-ietf-sfc-oam-framework/</a>&lt;<a href=3D"https://nam03.safelinks.p=
rotection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdra=
ft-ietf-sfc-oam-framework%2F&amp;data=3D02%7C01%7Cjames.n.guichard%40future=
wei.com%7Ce47e5eb13f224f18c46408d6e378b2f7%7C0fee8ff2a3b240189c753a1d5591fe=
dc%7C1%7C0%7C636946504868870205&amp;sdata=3DlkKvAgmKik7lkqGANQpnIvBRdbjKAqY=
tzTUdTfB9f3Y%3D&amp;reserved=3D0" rel=3D"noreferrer" target=3D"_blank">http=
s://nam03.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdatatracker=
.ietf.org%2Fdoc%2Fdraft-ietf-sfc-oam-framework%2F&amp;data=3D02%7C01%7Cjame=
s.n.guichard%40futurewei.com%7Ce47e5eb13f224f18c46408d6e378b2f7%7C0fee8ff2a=
3b240189c753a1d5591fedc%7C1%7C0%7C636946504868870205&amp;sdata=3DlkKvAgmKik=
7lkqGANQpnIvBRdbjKAqYtzTUdTfB9f3Y%3D&amp;reserved=3D0</a>&gt;<br>
&gt;=C2=A0 for publication as an Informational RFC.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Substantive comments and statements of support for publishing this doc=
ument should be directed to the mailing list. Editorial suggestions can be =
sent to the authors.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Please let me know if there=E2=80=99s anything that was missed on this=
 reply.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Thanks,<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Carlos.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; This last call will end on 11th June 2019.<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Thanks!<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Jim &amp; Joel<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; _______________________________________________<br>
&gt; sfc mailing list<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><a href=3D"mailto:sfc@ietf.org" target=3D"_blank">sfc@ietf.org</a>&l=
t;mailto:<a href=3D"mailto:sfc@ietf.org" target=3D"_blank">sfc@ietf.org</a>=
&gt;<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><a href=3D"https://www.ietf.org/mailman/listinfo/sfc" rel=3D"norefer=
rer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/sfc</a><br>
&gt; _______________________________________________<br>
&gt; sfc mailing list<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><a href=3D"mailto:sfc@ietf.org" target=3D"_blank">sfc@ietf.org</a>&l=
t;mailto:<a href=3D"mailto:sfc@ietf.org" target=3D"_blank">sfc@ietf.org</a>=
&gt;<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><a href=3D"https://www.ietf.org/mailman/listinfo/sfc" rel=3D"norefer=
rer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/sfc</a><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Greg Mirsky<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; Sr. Standardization Expert<br>
&gt; =E9=A2=84=E7=A0=94=E6=A0=87=E5=87=86=E9=83=A8/=E6=9C=89=E7=BA=BF=E7=A0=
=94=E7=A9=B6=E9=99=A2/=E6=9C=89=E7=BA=BF=E4=BA=A7=E5=93=81=E7=BB=8F=E8=90=
=A5=E9=83=A8 Standard Preresearch Dept./Wireline Product R&amp;D Institute/=
Wireline Product Operation Division<br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><br>
&gt; &lt;9ae3e214c17d49ed935d87c674ba3ee2.jpg&gt;=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 &lt;24242e5637af428891c4db731e7765ad.jpg&gt;<br>
&gt; E:<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=
=A0</span><a href=3D"mailto:gregory.mirsky@ztetx.com" target=3D"_blank">gre=
gory.mirsky@ztetx.com</a><span class=3D"gmail-m_5871177670165181250Apple-co=
nverted-space">=C2=A0</span><br>
&gt;<span class=3D"gmail-m_5871177670165181250Apple-converted-space">=C2=A0=
</span><a href=3D"http://www.zte.com.cn/" rel=3D"noreferrer" target=3D"_bla=
nk">www.zte.com.cn</a><br>
<br>
_______________________________________________<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" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/sfc</a><br>
</blockquote>
</div>
</div>
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From: Tal Mizrahi <tal.mizrahi.phd@gmail.com>
Date: Mon, 17 Jun 2019 07:20:24 +0300
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To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
Cc: "gregory.mirsky@ztetx.com" <gregory.mirsky@ztetx.com>,  Service Function Chaining IETF list <sfc@ietf.org>, "sfc-chairs@ietf.org" <sfc-chairs@ietf.org>
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Subject: Re: [sfc] Adopting draft-mirsky-sfc-pmamm
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Hi Carlos,

[As a co-author]

Thanks for the thorough review and detailed comments.
My feeling is that most of these comments can be addressed by careful
wordsmithing.

One question that I am interested to hear your response to is: do you think
that the working group should be working on alternate marking for NSH? In
my opinion this is the most interesting question when considering working
group adoption, and I am sure you have a solid opinion since you were the
shepherd of RFC 8321 and the editor of RFC 8300. Will appreciate your
opinion on this.

Cheers,
Tal.



On Sun, Jun 16, 2019 at 7:32 AM Carlos Pignataro (cpignata) <
cpignata@cisco.com> wrote:

> Hello, Greg,
>
> Please see inline.
>
> On Jun 11, 2019, at 12:23 AM, gregory.mirsky@ztetx.com wrote:
>
> Dear Carlos,
>
> thank you for your review and comments. Please find my responses in-line
> tagged GIM>>. Attached are the updated version and the diff.
>
>
> Regards,
>
> Greg Mirsky
>
>
>
> Joel, Jim,
>
> I reflected on this adoption call. In the end, I oppose adopting this dra=
ft as a working group document at this point.
>
> After all consideration, my evaluation is that, at best, it is very prema=
ture.
>
> Here=E2=80=99s some of the technical reasons for this:
>
> 1. Fundamental mis-assumptions.
>
> 1.1.
>
> The whole basis of this document is using a =E2=80=9Cmarking=E2=80=9D met=
hod as a passive PM method. This is the only sentence in the Abstract:
>
>    This document describes how the alternate marking method be used as
>    the passive performance measurement method in a Service Function
>    Chaining (SFC) domain.
>
> However, the definition of a passive method from RFC 7799 is: <https://to=
ols.ietf.org/html/rfc7799#section-3.6>https://tools.ietf.org/html/rfc7799#s=
ection-3.6
>    o  based solely on observations of an undisturbed and unmodified
>       packet stream of interest (in other words, the method of
>       measurement MUST NOT add, change, or remove packets or fields or
>       change field values anywhere along the path).
>
> This definition says MUST NOT change field values.
>
> I understand the document says:
>    alternate marking method in SFC layer can be viewed as a real example
>    of passive performance measurement method.
>
> However, that is not saying =E2=80=9Cit is a passive method because of th=
is thorough analysis=E2=80=9D.
>
> I also understand that RFC 8321 gives guidance of when an alternate-marki=
ng method can be considered Hybrid vs. Passive.
>
> I remember because I was Document Shepherd on that I-D to become RFC 8321=
.
>
> However, the SFC NSH can be encapsulated in a number of transport encapsu=
lation protocols. There is no analysis to explain how the changing of this =
field value will not result in a different forwarding (e.g., path, treatmen=
t) decision.
> GIM>> I agree that from the classification of the performance measurement=
 methods the AltMark method belongs to Hybrid class. Thus I accept your com=
ments and propose two updates in Abstract:
>
>
> This comment is fundamental to the document=E2=80=99s approach, and in my=
 opinion,
> not a quick s/passive/hybrid/g word replacement. As a hybrid method it
> ought to rationalize the approach with existing hybrid methods.
>
> OLD TEXT:
>    This document describes how the alternate marking method be used as
>    the passive performance measurement method in a Service Function
>    Chaining (SFC) domain.
> NEW TEXT:
>    This document describes how the alternate marking method can be used
>    as the efficient performance measurement method taking advandage of
>    the actual data flows in a Service Function Chaining (SFC) domain.
> Introduction:
> OLD TEXT:
>    [RFC8321] describes the passive performance measurement method, which =
can be
>    used to measure packet loss, latency, and jitter on live traffic.
> NEW TEXT:
>    [RFC8321] describes the hybrid performance measurement method, which c=
an be
>    used to measure packet loss, latency, and jitter on live traffic.
> and Section 3:
> OLD TEXT:
>    Because the setting of the field to any value does not affect
>    forwarding and/or quality of service treatment of a packet, the
>    alternate marking method in SFC layer can be viewed as a real example
>    of passive performance measurement method.
> NEW TEXT:
>    Though the setting of the field to any value likely not affect
>    forwarding and/or quality of service treatment of a packet, the
>    alternate marking method in SFC layer it is characterized as an
>    example of hybrid performance measurement method according to
>    [RFC7799].
>    For example, there=E2=80=99s an MPLS SFC NSH encapsulation just publis=
hed as RFC, and here this document attempts to define a bit in the first ni=
bble. RFC 8300 carefully reserved version numbers to prevent ECMP treatment=
. Here, my point is no to move the bit around, but to exemplify how there=
=E2=80=99s been lack of captured thought about this proposal and approach.
> GIM>> I cannot find a technical foundation for your concern.
>
> Sorry if I was not clear, I will try to be more explicit.
>
>  The proposed M field, as well as already allocated in RFC 8300 O field h=
ave no impact on possible ECMP treatment of NSH. The fact is that devices t=
hat use DPI after the MPLS stack are acting only on 0x04 and 0x6 values.
>
> This is a bold statement. Do you have a survey of all devices that perfor=
m
> DPI and their behavior in regards to the first nibble? (Assuming you mean
> 0x4 and not 0x04)
>
>  Because the value 01b is reserved for the V field, an NSH cannot be take=
n for IPv4 or IPv6 header with any values of O and M fields. If it is not c=
lear from Section 2.2 in RFC 8300, we can add text in the further version.
>    1.2.
>
> Indeed, RFC 8300 tried to prevent this as possible by reserving version 1=
.
> But my point is that assigning this would need some analysis captured in
> the document.
>
> There=E2=80=99s been no discussion about whether this specific solution i=
s what SFC needs for Passive OAM, or of the risks of this modifying forward=
ing. And weather the NSH Base Header is the best place for these measuremen=
ts.
>    GIM>> The draft was presented at the meetings and received a reasonabl=
e amount of comments.
>
> Greg, First, what is a =E2=80=9Creasonable amount of comments=E2=80=9D? R=
easonable to
> whom? And who is making hat call? That seems like a chair responsibility
> and not a document author=E2=80=99s call.
> Second, looking objectively at
> https://mailarchive.ietf.org/arch/search/?q=3Ddraft-mirsky-sfc-pmamm, I d=
o
> not see many non-author comments.
>
>  Could you point to the text in the draft that proposes a change in forwa=
rding?
>
> Greg, did I write that the draft "proposes a change in forwarding"?
> Please, again, refrain from mis-attributing text that I did not write or
> say.
>
> I wrote =E2=80=9Cor of the risks of this modifying forwarding=E2=80=9D, w=
hich is quite
> different, and my point is that the draft should prove that it doesn=E2=
=80=99t.
>
>  Also, I'd indicate that the measurements are performed at the node that =
acts on the M field and that the results are not exported in the data packe=
t that triggered the measurement but stored at the node. A possible method =
to export the results is outside the scope of the draft.
>
>
> 2. Solution looking for a problem.
>
> This draft defines a solution, but it really does not indicate the scope =
or extend of the problem being solved. It does not explain how this specifi=
c solution fits in the potential constellation of OAM solutions for SFC.
>
> And as such, it is impossible to compare it against other potential solut=
ions, or to evaluate or understand how it fits in the overall OAM Framework=
.
>
> Which exact function of OAM is this solving, and given the graph-nature o=
f SFC, is this too simplistic of a solution for Performance Measurement, wh=
ere other hybrid solutions can provide a large superset of this functionali=
ty?
>
> This is compounded by one additional issue:
>
> There seems to be a tendency of, without explanation, extrapolating RFCs =
and solutions into all possible protocols, regardless of their need.
>
> For example, after RFC 7110, there were all kinds of specified-return-pat=
hs documents for many protocols =E2=80=94 even for things that did not make=
 full sense like for SFC. I would cautious us to develop standards based on=
 needs.
>    GIM>> I don't see how this is relevant to this WG AP.
>
> On the contrary; in my opinion, this concern goes to the heart of
> the raison d=E2=80=99=C3=AAtre of the document, and the problem it is sup=
posedly
> solving.
>
> And equally important, to understand the overall landscape of Performance=
 Measurement before pushing too localized solutions.
>
>
> 3. Grossly underdefined and underspecified operations.
>
> 3.1.
>
> The Theory of Operation in Section 4 does not really explain the role of =
any node (headend, tailed, midpoint) or (SF, SFF, Classifier). Which nodes =
can/must mark/read/change, etc. Sections 4.1, 4.2, 4.2 explains details of =
the Alternate Marking method, but not the SFC applicability or usage.
> GIM>> The general idea is reflected in
>    Using the marking method a component of the SFC creates distinct sub-
>    flows in the particular service traffic over SFC.  Each sub-flow
>    consists of consecutive blocks that are unambiguously recognizable by
>    a monitoring point at any component of the SFC and can be measured to
>    calculate packet loss and/or packet delay metrics.
>
>
> This comment is not answering my question. The general idea is clear
> without this document. The specific idea is not explained in this documen=
t.
>
> Also, Section 4.2 describes how AMM can be used to measure the Residence =
Time of SFF and/or SF. Of course, we'll continue adding more details to exp=
lain examples of using AMM in SFC and welcome all contributions, suggestion=
s.
>
> 3.2.
>
> What is the default value for the bit?
> GIM>> By default the M flag MUST be set to 0. The added text in Section 3=
:
> NEW TEXT
>    The Mark field MUST be set to 0 at initialization of NSH and ignored o=
n
>    receiption when the method is not in use.
> 3.3.
>
> The document says it creates sub-flows within SFC:
>
>    Using the marking method a component of the SFC creates distinct sub-
>    flows in the particular service traffic over SFC.
>
> How does this interact with Flow concepts in SFC?
> GIM>> These sub-flows are only detected by a node that is being enabled t=
o use AMM on the given SFC flow. As stated in Section 3,
>
> RFC 8300 does not use the term =E2=80=9Cflow=E2=80=9D. Therefore, a sub-f=
low of what? And
> is this using the Flow definition in Section 5
> of draft-ietf-sfc-nsh-tlv-00?
>
>    The Mark field MUST NOT be
>    used in defining forwarding and/or quality of service treatment of an
>    SFC packet.  The Mark field MUST be used only for the performance
>    measurement of data traffic in the SFC layer.
> AMM sub-flows must not alter processing of SFC flow they are part of.
>
> 4. Effectively null considerations to security.
>
> The security considerations reads:
>
>    This document lists the OAM requirement for SFC domain and does not
>    raise any security concerns or issues in addition to ones common to
>    networking and SFC.
> GIM>> Will expand on Security Consideration in further versions.
>
> Greg, I did not comment that the section needed expanding. I was asking
> what it means. Maybe it needs full replacing more than expanding.
>
> I hope these responses are useful to the WG.
>
> Best,
>
> Carlos.
>
> It is unclear if that is a copy/paste from another document, or what it r=
eally means.
>
>
> 5. Minor issues
>
> The NSH [RFC 8300] does not have =E2=80=9CR=E2=80=9D bits. It has =E2=80=
=9CU=E2=80=9D bits.
> GIM>> Thank you. Update the figure.
>
> Thanks,
>
> Carlos.
>
>
>
> On May 24, 2019, at 2:17 PM, Joel M. Halpern <jmh@joelhalpern.com<mailto:=
jmh@joelhalpern.com <jmh@joelhalpern.com>>> wrote:
>
> This email starts the adoption call for draft-mirsky-sfc-pmamm (https://d=
atatracker.ietf.org/doc/draft-mirsky-sfc-pmamm/).
>
> Please speak up if you support or oppose adopting this document as a work=
ing group document.  Please provide reasons for that view.
> Silence will not be considered consent.
>
> The adoption call will end CoB 10 June 2019.
>
> Yours,
> Joel (and Jim
>
> On 5/20/19 1:58 PM, Greg Mirsky wrote:
> Dear Joel and Jim,
> authors ofdraft-mirsky-sfc-pmamm believe that the draft, that defines how=
 the Alternate Marking (RFC 8321) technique can be used in SFC NSH, is stab=
le, and ready for the working group adoption. Much appreciate your consider=
ation to start the WG AP.
> Best regards,
> Greg
>
> _______________________________________________
> sfc mailing listsfc@ietf.org<mailto:sfc@ietf.org <sfc@ietf.org>>https://w=
ww.ietf.org/mailman/listinfo/sfc
>
>
>
> <draft-mirsky-sfc-pmamm-08.txt><Diff_ draft-mirsky-sfc-pmamm-07.txt -
> draft-mirsky-sfc-pmamm-08.txt.html>
>
>
>

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<div dir=3D"ltr">Hi Carlos,<div><br></div><div>[As a co-author]</div><div><=
br></div><div>Thanks for the thorough review and detailed comments.</div><d=
iv>My feeling is that most of these comments can be addressed by careful wo=
rdsmithing.</div><div><br></div><div>One question that I am interested to h=
ear your response to is: do you think that the working group should be work=
ing on alternate marking for NSH? In my opinion this is the most interestin=
g question when considering working group adoption, and I am sure you have =
a solid opinion since you were the shepherd of RFC 8321 and the editor of R=
FC 8300. Will appreciate your opinion on this.</div><div><br></div><div>Che=
ers,</div><div>Tal.</div><div><br></div><div><br></div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Jun 16, 2019=
 at 7:32 AM Carlos Pignataro (cpignata) &lt;<a href=3D"mailto:cpignata@cisc=
o.com">cpignata@cisco.com</a>&gt; wrote:<br></div><blockquote class=3D"gmai=
l_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,20=
4,204);padding-left:1ex">



<div style=3D"overflow-wrap: break-word;">
Hello, Greg,
<div><br>
</div>
<div>Please see inline.<br>
<div><br>
<blockquote type=3D"cite">
<div>On Jun 11, 2019, at 12:23 AM, <a href=3D"mailto:gregory.mirsky@ztetx.c=
om" target=3D"_blank">
gregory.mirsky@ztetx.com</a> wrote:</div>
<br class=3D"gmail-m_-7601698932257724403Apple-interchange-newline">
<div>
<div class=3D"gmail-m_-7601698932257724403zcontentRow" style=3D"font-family=
:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-w=
eight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-tr=
ansform:none;white-space:normal;word-spacing:0px;text-decoration:none">
<div class=3D"gmail-m_-7601698932257724403zcontentRow">
<p style=3D"font-size:14px;font-family:arial">Dear Carlos,</p>
<p style=3D"font-size:14px;font-family:arial">thank you for your review and=
 comments. Please find my responses in-line tagged GIM&gt;&gt;. Attached ar=
e the updated version and the diff.</p>
<p style=3D"font-size:14px;font-family:arial"><br>
</p>
<div class=3D"gmail-m_-7601698932257724403zMailSign">
<div class=3D"gmail-m_-7601698932257724403zMailSignContent">
<p style=3D"font-family:=E5=AE=8B=E4=BD=93;font-size:14px;line-height:norma=
l">
<span style=3D"color:rgb(88,89,91);font-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=
=E9=BB=91;font-size:14px"><span class=3D"gmail-m_-7601698932257724403signed=
it">Regards,</span></span></p>
<p style=3D"font-family:=E5=AE=8B=E4=BD=93;font-size:14px;line-height:norma=
l">
<span style=3D"font-size:14px;color:rgb(88,89,91);font-family:=E5=BE=AE=E8=
=BD=AF=E9=9B=85=E9=BB=91"><span class=3D"gmail-m_-7601698932257724403signed=
it" id=3D"gmail-m_-7601698932257724403sign_name">Greg Mirsky</span></span><=
/p>
<p style=3D"font-size:14px;line-height:normal"><span style=3D"color:rgb(88,=
89,91);font-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91;font-size:14px"><sp=
an><span class=3D"gmail-m_-7601698932257724403signedit"><br>
</span></span></span></p>
<p style=3D"font-size:14px;line-height:normal"><br>
</p>
<pre class=3D"gmail-m_-7601698932257724403wordwrap">Joel, Jim,

I reflected on this adoption call. In the end, I oppose adopting this draft=
 as a working group document at this point.

After all consideration, my evaluation is that, at best, it is very prematu=
re.

Here=E2=80=99s some of the technical reasons for this:

1. Fundamental mis-assumptions.

1.1.

The whole basis of this document is using a =E2=80=9Cmarking=E2=80=9D metho=
d as a passive PM method. This is the only sentence in the Abstract:

   This document describes how the alternate marking method be used as
   the passive performance measurement method in a Service Function
   Chaining (SFC) domain.

However, the definition of a passive method from RFC 7799 is:<a href=3D"htt=
ps://tools.ietf.org/html/rfc7799#section-3.6" rel=3D"nofollow" target=3D"_b=
lank"></a><a href=3D"https://tools.ietf.org/html/rfc7799#section-3.6" targe=
t=3D"_blank">https://tools.ietf.org/html/rfc7799#section-3.6</a>
   o  based solely on observations of an undisturbed and unmodified
      packet stream of interest (in other words, the method of
      measurement MUST NOT add, change, or remove packets or fields or
      change field values anywhere along the path).

This definition says MUST NOT change field values.

I understand the document says:
   alternate marking method in SFC layer can be viewed as a real example
   of passive performance measurement method.

However, that is not saying =E2=80=9Cit is a passive method because of this=
 thorough analysis=E2=80=9D.

I also understand that RFC 8321 gives guidance of when an alternate-marking=
 method can be considered Hybrid vs. Passive.

I remember because I was Document Shepherd on that I-D to become RFC 8321.

However, the SFC NSH can be encapsulated in a number of transport encapsula=
tion protocols. There is no analysis to explain how the changing of this fi=
eld value will not result in a different forwarding (e.g., path, treatment)=
 decision. <br>GIM&gt;&gt; I agree that from the classification of the perf=
ormance measurement methods the AltMark method belongs to Hybrid class. Thu=
s I accept your comments and propose two updates in Abstract:<br></pre>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>This comment is fundamental to the document=E2=80=99s approach, and in=
 my opinion, not a quick s/passive/hybrid/g word replacement. As a hybrid m=
ethod it ought to rationalize the approach with existing hybrid methods.=C2=
=A0</div>
<blockquote type=3D"cite">
<div>
<div class=3D"gmail-m_-7601698932257724403zcontentRow" style=3D"font-family=
:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-w=
eight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-tr=
ansform:none;white-space:normal;word-spacing:0px;text-decoration:none">
<div class=3D"gmail-m_-7601698932257724403zcontentRow">
<div class=3D"gmail-m_-7601698932257724403zMailSign">
<div class=3D"gmail-m_-7601698932257724403zMailSignContent">
<pre class=3D"gmail-m_-7601698932257724403wordwrap">OLD TEXT:<br>   This do=
cument describes how the alternate marking method be used as
   the passive performance measurement method in a Service Function
   Chaining (SFC) domain.
NEW TEXT:<br>   This document describes how the alternate marking method ca=
n be used
   as the efficient performance measurement method taking advandage of
   the actual data flows in a Service Function Chaining (SFC) domain.   <br=
>Introduction:<br>OLD TEXT:<br>   [RFC8321] describes the passive performan=
ce measurement method, which can be
   used to measure packet loss, latency, and jitter on live traffic.<br>NEW=
 TEXT:<br>   [RFC8321] describes the hybrid performance measurement method,=
 which can be
   used to measure packet loss, latency, and jitter on live traffic.   <br>=
and Section 3:<br>OLD TEXT:<br>   Because the setting of the field to any v=
alue does not affect
   forwarding and/or quality of service treatment of a packet, the
   alternate marking method in SFC layer can be viewed as a real example
   of passive performance measurement method.<br>NEW TEXT:<br>   Though the=
 setting of the field to any value likely not affect
   forwarding and/or quality of service treatment of a packet, the
   alternate marking method in SFC layer it is characterized as an
   example of hybrid performance measurement method according to
   [RFC7799].   <br>   For example, there=E2=80=99s an MPLS SFC NSH encapsu=
lation just published as RFC, and here this document attempts to define a b=
it in the first nibble. RFC 8300 carefully reserved version numbers to prev=
ent ECMP treatment. Here, my point is no to move the bit around, but to exe=
mplify how there=E2=80=99s been lack of captured thought about this proposa=
l and approach.<br>GIM&gt;&gt; I cannot find a technical foundation for you=
r concern.</pre>
</div>
</div>
</div>
</div>
</div>
</blockquote>
Sorry if I was not clear, I will try to be more explicit.=C2=A0<br>
<blockquote type=3D"cite">
<div>
<div class=3D"gmail-m_-7601698932257724403zcontentRow" style=3D"font-family=
:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-w=
eight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-tr=
ansform:none;white-space:normal;word-spacing:0px;text-decoration:none">
<div class=3D"gmail-m_-7601698932257724403zcontentRow">
<div class=3D"gmail-m_-7601698932257724403zMailSign">
<div class=3D"gmail-m_-7601698932257724403zMailSignContent">
<pre class=3D"gmail-m_-7601698932257724403wordwrap"> The proposed M field, =
as well as already allocated in RFC 8300 O field have no impact on possible=
 ECMP treatment of NSH. The fact is that devices that use DPI after the MPL=
S stack are acting only on 0x04 and 0x6 values.</pre>
</div>
</div>
</div>
</div>
</div>
</blockquote>
This is a bold statement. Do you have a survey of all devices that perform =
DPI and their behavior in regards to the first nibble? (Assuming you mean 0=
x4 and not 0x04)<br>
<blockquote type=3D"cite">
<div>
<div class=3D"gmail-m_-7601698932257724403zcontentRow" style=3D"font-family=
:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-w=
eight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-tr=
ansform:none;white-space:normal;word-spacing:0px;text-decoration:none">
<div class=3D"gmail-m_-7601698932257724403zcontentRow">
<div class=3D"gmail-m_-7601698932257724403zMailSign">
<div class=3D"gmail-m_-7601698932257724403zMailSignContent">
<pre class=3D"gmail-m_-7601698932257724403wordwrap"> Because the value 01b =
is reserved for the V field, an NSH cannot be taken for IPv4 or IPv6 header=
 with any values of O and M fields. If it is not clear from Section 2.2 in =
RFC 8300, we can add text in the further version.<br>   1.2.
</pre>
</div>
</div>
</div>
</div>
</div>
</blockquote>
Indeed, RFC 8300 tried to prevent this as possible by reserving version 1. =
But my point is that assigning this would need some analysis captured in th=
e document.<br>
<blockquote type=3D"cite">
<div>
<div class=3D"gmail-m_-7601698932257724403zcontentRow" style=3D"font-family=
:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-w=
eight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-tr=
ansform:none;white-space:normal;word-spacing:0px;text-decoration:none">
<div class=3D"gmail-m_-7601698932257724403zcontentRow">
<div class=3D"gmail-m_-7601698932257724403zMailSign">
<div class=3D"gmail-m_-7601698932257724403zMailSignContent">
<pre class=3D"gmail-m_-7601698932257724403wordwrap">There=E2=80=99s been no=
 discussion about whether this specific solution is what SFC needs for Pass=
ive OAM, or of the risks of this modifying forwarding. And weather the NSH =
Base Header is the best place for these measurements.<br>   GIM&gt;&gt; The=
 draft was presented at the meetings and received a reasonable amount of co=
mments.</pre>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>Greg, First, what is a =E2=80=9Creasonable amount of comments=E2=80=9D=
? Reasonable to whom? And who is making hat call? That seems like a chair r=
esponsibility and not a document author=E2=80=99s call.=C2=A0</div>
<div>Second, looking objectively at=C2=A0<a href=3D"https://mailarchive.iet=
f.org/arch/search/?q=3Ddraft-mirsky-sfc-pmamm" target=3D"_blank">https://ma=
ilarchive.ietf.org/arch/search/?q=3Ddraft-mirsky-sfc-pmamm</a>, I do not se=
e many non-author comments.</div>
<div><br>
</div>
<blockquote type=3D"cite">
<div>
<div class=3D"gmail-m_-7601698932257724403zcontentRow" style=3D"font-family=
:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-w=
eight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-tr=
ansform:none;white-space:normal;word-spacing:0px;text-decoration:none">
<div class=3D"gmail-m_-7601698932257724403zcontentRow">
<div class=3D"gmail-m_-7601698932257724403zMailSign">
<div class=3D"gmail-m_-7601698932257724403zMailSignContent">
<pre class=3D"gmail-m_-7601698932257724403wordwrap"> Could you point to the=
 text in the draft that proposes a change in forwarding?</pre>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<div>Greg, did I write that the draft &quot;proposes a change in forwarding=
&quot;? Please, again, refrain from mis-attributing text that I did not wri=
te or say.</div>
<div><br>
</div>
<div>I wrote =E2=80=9Cor of the risks of this modifying forwarding=E2=80=9D=
, which is quite different, and my point is that the draft should prove tha=
t it doesn=E2=80=99t.<br>
<blockquote type=3D"cite">
<div>
<div class=3D"gmail-m_-7601698932257724403zcontentRow" style=3D"font-family=
:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-w=
eight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-tr=
ansform:none;white-space:normal;word-spacing:0px;text-decoration:none">
<div class=3D"gmail-m_-7601698932257724403zcontentRow">
<div class=3D"gmail-m_-7601698932257724403zMailSign">
<div class=3D"gmail-m_-7601698932257724403zMailSignContent">
<pre class=3D"gmail-m_-7601698932257724403wordwrap"> Also, I&#39;d indicate=
 that the measurements are performed at the node that acts on the M field a=
nd that the results are not exported in the data packet that triggered the =
measurement but stored at the node. A possible method to export the results=
 is outside the scope of the draft.


2. Solution looking for a problem.

This draft defines a solution, but it really does not indicate the scope or=
 extend of the problem being solved. It does not explain how this specific =
solution fits in the potential constellation of OAM solutions for SFC.

And as such, it is impossible to compare it against other potential solutio=
ns, or to evaluate or understand how it fits in the overall OAM Framework.

Which exact function of OAM is this solving, and given the graph-nature of =
SFC, is this too simplistic of a solution for Performance Measurement, wher=
e other hybrid solutions can provide a large superset of this functionality=
?

This is compounded by one additional issue:

There seems to be a tendency of, without explanation, extrapolating RFCs an=
d solutions into all possible protocols, regardless of their need.

For example, after RFC 7110, there were all kinds of specified-return-paths=
 documents for many protocols =E2=80=94 even for things that did not make f=
ull sense like for SFC. I would cautious us to develop standards based on n=
eeds.<br>   GIM&gt;&gt; I don&#39;t see how this is relevant to this WG AP.
</pre>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>On the contrary; in my opinion, this concern goes to the heart of the=
=C2=A0raison d=E2=80=99=C3=AAtre of the document, and the problem it is sup=
posedly solving.=C2=A0</div>
<blockquote type=3D"cite">
<div class=3D"gmail-m_-7601698932257724403zcontentRow">
<div class=3D"gmail-m_-7601698932257724403zcontentRow">
<div class=3D"gmail-m_-7601698932257724403zMailSign">
<div class=3D"gmail-m_-7601698932257724403zMailSignContent"></div>
</div>
</div>
</div>
</blockquote>
<blockquote type=3D"cite">
<div>
<div class=3D"gmail-m_-7601698932257724403zcontentRow" style=3D"font-family=
:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-w=
eight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-tr=
ansform:none;white-space:normal;word-spacing:0px;text-decoration:none">
<div class=3D"gmail-m_-7601698932257724403zcontentRow">
<div class=3D"gmail-m_-7601698932257724403zMailSign">
<div class=3D"gmail-m_-7601698932257724403zMailSignContent">
<pre class=3D"gmail-m_-7601698932257724403wordwrap">And equally important, =
to understand the overall landscape of Performance Measurement before pushi=
ng too localized solutions.


3. Grossly underdefined and underspecified operations.

3.1.

The Theory of Operation in Section 4 does not really explain the role of an=
y node (headend, tailed, midpoint) or (SF, SFF, Classifier). Which nodes ca=
n/must mark/read/change, etc. Sections 4.1, 4.2, 4.2 explains details of th=
e Alternate Marking method, but not the SFC applicability or usage.  =20
GIM&gt;&gt; The general idea is reflected in   =20
   Using the marking method a component of the SFC creates distinct sub-
   flows in the particular service traffic over SFC.  Each sub-flow
   consists of consecutive blocks that are unambiguously recognizable by
   a monitoring point at any component of the SFC and can be measured to
   calculate packet loss and/or packet delay metrics.<br></pre>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div><br>
</div>
This comment is not answering my question. The general idea is clear withou=
t this document. The specific idea is not explained in this document.<br>
<blockquote type=3D"cite">
<div>
<div class=3D"gmail-m_-7601698932257724403zcontentRow" style=3D"font-family=
:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-w=
eight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-tr=
ansform:none;white-space:normal;word-spacing:0px;text-decoration:none">
<div class=3D"gmail-m_-7601698932257724403zcontentRow">
<div class=3D"gmail-m_-7601698932257724403zMailSign">
<div class=3D"gmail-m_-7601698932257724403zMailSignContent">
<pre class=3D"gmail-m_-7601698932257724403wordwrap">Also, Section 4.2 descr=
ibes how AMM can be used to measure the Residence Time of SFF and/or SF. Of=
 course, we&#39;ll continue adding more details to explain examples of usin=
g AMM in SFC and welcome all contributions, suggestions.  =20

3.2.

What is the default value for the bit?<br>GIM&gt;&gt; By default the M flag=
 MUST be set to 0. The added text in Section 3:<br>NEW TEXT
   The Mark field MUST be set to 0 at initialization of NSH and ignored on
   receiption when the method is not in use.
3.3.

The document says it creates sub-flows within SFC:

   Using the marking method a component of the SFC creates distinct sub-
   flows in the particular service traffic over SFC.

How does this interact with Flow concepts in SFC?
GIM&gt;&gt; These sub-flows are only detected by a node that is being enabl=
ed to use AMM on the given SFC flow. As stated in Section 3,<br></pre>
</div>
</div>
</div>
</div>
</div>
</blockquote>
RFC 8300 does not use the term =E2=80=9Cflow=E2=80=9D. Therefore, a sub-flo=
w of what? And is this using the Flow definition in Section 5 of=C2=A0draft=
-ietf-sfc-nsh-tlv-00?=C2=A0<br>
<blockquote type=3D"cite">
<div>
<div class=3D"gmail-m_-7601698932257724403zcontentRow" style=3D"font-family=
:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-w=
eight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-tr=
ansform:none;white-space:normal;word-spacing:0px;text-decoration:none">
<div class=3D"gmail-m_-7601698932257724403zcontentRow">
<div class=3D"gmail-m_-7601698932257724403zMailSign">
<div class=3D"gmail-m_-7601698932257724403zMailSignContent">
<pre class=3D"gmail-m_-7601698932257724403wordwrap">   The Mark field MUST =
NOT be
   used in defining forwarding and/or quality of service treatment of an
   SFC packet.  The Mark field MUST be used only for the performance
   measurement of data traffic in the SFC layer.<br>AMM sub-flows must not =
alter processing of SFC flow they are part of.  =20

4. Effectively null considerations to security.

The security considerations reads:

   This document lists the OAM requirement for SFC domain and does not
   raise any security concerns or issues in addition to ones common to
   networking and SFC.
GIM&gt;&gt; Will expand on Security Consideration in further versions.
</pre>
</div>
</div>
</div>
</div>
</div>
</blockquote>
Greg, I did not comment that the section needed expanding. I was asking wha=
t it means. Maybe it needs full replacing more than expanding.</div>
<div><br>
</div>
<div>I hope these responses are useful to the WG.</div>
<div><br>
</div>
<div>Best,</div>
<div><br>
</div>
<div>Carlos.<br>
<blockquote type=3D"cite">
<div>
<div class=3D"gmail-m_-7601698932257724403zcontentRow" style=3D"font-family=
:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-w=
eight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-tr=
ansform:none;white-space:normal;word-spacing:0px;text-decoration:none">
<div class=3D"gmail-m_-7601698932257724403zcontentRow">
<div class=3D"gmail-m_-7601698932257724403zMailSign">
<div class=3D"gmail-m_-7601698932257724403zMailSignContent">
<pre class=3D"gmail-m_-7601698932257724403wordwrap">It is unclear if that i=
s a copy/paste from another document, or what it really means.


5. Minor issues

The NSH [RFC 8300] does not have =E2=80=9CR=E2=80=9D bits. It has =E2=80=9C=
U=E2=80=9D bits.<br>GIM&gt;&gt; Thank you. Update the figure.

Thanks,

Carlos.



On May 24, 2019, at 2:17 PM, Joel M. Halpern &lt;<a href=3D"mailto:jmh@joel=
halpern.com" target=3D"_blank">jmh@joelhalpern.com</a>&lt;<a href=3D"mailto=
:jmh@joelhalpern.com" target=3D"_blank">mailto:jmh@joelhalpern.com</a>&gt;&=
gt; wrote:

This email starts the adoption call for draft-mirsky-sfc-pmamm (<a href=3D"=
https://datatracker.ietf.org/doc/draft-mirsky-sfc-pmamm/" rel=3D"nofollow" =
target=3D"_blank">https://datatracker.ietf.org/doc/draft-mirsky-sfc-pmamm/<=
/a>).

Please speak up if you support or oppose adopting this document as a workin=
g group document.  Please provide reasons for that view.
Silence will not be considered consent.

The adoption call will end CoB 10 June 2019.

Yours,
Joel (and Jim

On 5/20/19 1:58 PM, Greg Mirsky wrote:
Dear Joel and Jim,
authors ofdraft-mirsky-sfc-pmamm believe that the draft, that defines how t=
he Alternate Marking (RFC 8321) technique can be used in SFC NSH, is stable=
, and ready for the working group adoption. Much appreciate your considerat=
ion to start the WG AP.
Best regards,
Greg

_______________________________________________
sfc mailing list
<a href=3D"mailto:sfc@ietf.org" target=3D"_blank">sfc@ietf.org</a>&lt;<a hr=
ef=3D"mailto:sfc@ietf.org" target=3D"_blank">mailto:sfc@ietf.org</a>&gt;<a =
href=3D"https://www.ietf.org/mailman/listinfo/sfc" rel=3D"nofollow" target=
=3D"_blank">https://www.ietf.org/mailman/listinfo/sfc</a></pre>
<p style=3D"font-size:14px;line-height:normal"><span style=3D"color:rgb(88,=
89,91);font-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91;font-size:14px"><sp=
an><span class=3D"gmail-m_-7601698932257724403signedit"></span></span></spa=
n><br>
</p>
<div style=3D"font-size:14px;line-height:normal"><span style=3D"color:rgb(8=
8,89,91);font-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91;font-size:14px"><=
/span><br class=3D"gmail-m_-7601698932257724403webkit-block-placeholder">
</div>
<span style=3D"line-height:normal;color:rgb(88,89,91);font-size:10px"></spa=
n></div>
</div>
</div>
</div>
<span id=3D"gmail-m_-7601698932257724403cid:4C5EA69B-015B-469F-BBCD-8FE751B=
E0C5F@cisco.com">&lt;draft-mirsky-sfc-pmamm-08.txt&gt;</span><span id=3D"gm=
ail-m_-7601698932257724403cid:EADFE796-1D83-4B93-AF58-082C1EE32E11@cisco.co=
m">&lt;Diff_ draft-mirsky-sfc-pmamm-07.txt - draft-mirsky-sfc-pmamm-08.txt.=
html&gt;</span></div>
</blockquote>
</div>
<br>
</div>
</div>

</blockquote></div>

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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Mon, 17 Jun 2019 12:28:52 +0530
Message-ID: <CAB75xn58gUggXrZQXv-L_m_WZ8Ljt+1smgnLb7=iYU2Rm_fQaA@mail.gmail.com>
To: "Cesar Obediente (cobedien)" <cobedien@cisco.com>
Cc: "sfc@ietf.org" <sfc@ietf.org>, "sfc-chairs@ietf.org" <sfc-chairs@ietf.org>, ietf@meetecho.com
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Subject: Re: [sfc] Broken Link. -- IETF 87 - NSC
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Hi Cesar,

Meetecho recordings:
http://ietf87.conf.meetecho.com/index.php/Recorded_Sessions#NSC

Unfortunately, links for the recordings are not working, CCing meetecho team!
But, we still have -

Slides: https://www.ietf.org/proceedings/87/nsc.html
Audio: https://www6.ietf.org/audio/ietf87/ietf87-potsdam1-20130729-1300-pm.mp3
(last 1 hour in this is NSC BoF)

Enjoy!
Dhruv

On Sat, Jun 15, 2019 at 10:44 PM Cesar Obediente (cobedien)
<cobedien@cisco.com> wrote:
>
> Hi
>
> I was trying to look at the recording for BOF: Network Service Chaining BOF under this link
>
> https://tools.ietf.org/agenda/87/
>
> http://ietf87streaming.dnsalias.net/ietf/ietf874.m3u
>
> But it is not working. Can someone please help me find the correct link.
>
> Thanks
>
> Cesar
>
>
>
>
> -----------------------------------------
>
> Cesar Obediente, CCIE 5620
> Principal Systems Engineer
> 813-220-5736
> co@cisco.com
> @cobedien
> Blog: dcnextgen.blogspot.com
> _______________________________________________
> sfc mailing list
> sfc@ietf.org
> https://www.ietf.org/mailman/listinfo/sfc


From nobody Tue Jun 18 06:43:37 2019
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Subject: [sfc] I-D Action: draft-ietf-sfc-oam-framework-07.txt
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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 WG of the IETF.

        Title           : Service Function Chaining (SFC) Operations, Administration and Maintenance (OAM) Framework
        Authors         : Sam K. Aldrin
                          Carlos Pignataro
                          Nagendra Kumar
                          Nobo Akiya
                          Ram Krishnan
                          Anoop Ghanwani
	Filename        : draft-ietf-sfc-oam-framework-07.txt
	Pages           : 19
	Date            : 2019-06-18

Abstract:
   This document provides a reference framework for Operations,
   Administration and Maintenance (OAM) for Service Function Chaining
   (SFC).



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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-sfc-oam-framework-07
https://datatracker.ietf.org/doc/html/draft-ietf-sfc-oam-framework-07

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-oam-framework-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: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>
To: "sfc@ietf.org" <sfc@ietf.org>, Greg Mirsky <gregimirsky@gmail.com>, Adrian Farrel <adrian@olddog.co.uk>, "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>
Thread-Topic: [sfc] I-D Action: draft-ietf-sfc-oam-framework-07.txt
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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 WG of the IETF.

        Title           : Performance Measurement (PM) with Alternate Marking Method in Service Function Chaining (SFC) Domain
        Authors         : Greg Mirsky
                          Giuseppe Fioccola
                          Tal Mizrahi
	Filename        : draft-mirsky-sfc-pmamm-08.txt
	Pages           : 8
	Date            : 2019-06-18

Abstract:
   This document describes how the alternate marking method can be used
   as the efficient performance measurement method taking advantage of
   the actual data flows in a Service Function Chaining (SFC) domain.


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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-mirsky-sfc-pmamm-08
https://datatracker.ietf.org/doc/html/draft-mirsky-sfc-pmamm-08

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


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--000000000000065c9f058ba41236
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Dear All,
the updates are to address comments from Carlos on the characterization of
the AltMark method and the classification of the performance measurement
methods in RFC 7799. Authors are committed to continuing working on updates
to address all the comments received during the WG AP.

Regards,
Greg
---------- Forwarded message ---------
From: <internet-drafts@ietf.org>
Date: Wed, Jun 19, 2019 at 11:30 AM
Subject: [sfc] I-D Action: draft-mirsky-sfc-pmamm-08.txt
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 WG of the IETF.

        Title           : Performance Measurement (PM) with Alternate
Marking Method in Service Function Chaining (SFC) Domain
        Authors         : Greg Mirsky
                          Giuseppe Fioccola
                          Tal Mizrahi
        Filename        : draft-mirsky-sfc-pmamm-08.txt
        Pages           : 8
        Date            : 2019-06-18

Abstract:
   This document describes how the alternate marking method can be used
   as the efficient performance measurement method taking advantage of
   the actual data flows in a Service Function Chaining (SFC) domain.


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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-mirsky-sfc-pmamm-08
https://datatracker.ietf.org/doc/html/draft-mirsky-sfc-pmamm-08

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

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

--000000000000065c9f058ba41236
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><br>Dear All,<div>the updates are to address comments from=
 Carlos on the characterization of the AltMark method and the classificatio=
n of the performance measurement methods in RFC 7799. Authors are committed=
 to continuing working on updates to address all the comments received duri=
ng the WG AP.</div><div><br></div><div>Regards,</div><div>Greg<br><div clas=
s=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">---------- Forwarde=
d message ---------<br>From: <span dir=3D"auto">&lt;<a href=3D"mailto:inter=
net-drafts@ietf.org">internet-drafts@ietf.org</a>&gt;</span><br>Date: Wed, =
Jun 19, 2019 at 11:30 AM<br>Subject: [sfc] I-D Action: draft-mirsky-sfc-pma=
mm-08.txt<br>To:  &lt;<a href=3D"mailto:i-d-announce@ietf.org">i-d-announce=
@ietf.org</a>&gt;<br>Cc:  &lt;<a href=3D"mailto:sfc@ietf.org">sfc@ietf.org<=
/a>&gt;<br></div><br><br><br>
A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.<br>
This draft is a work item of the Service Function Chaining WG of the IETF.<=
br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 Performance Measurement (PM) with Alternate Marking Method in Service Func=
tion Chaining (SFC) Domain<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Authors=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: Greg=
 Mirsky<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Giuseppe Fioccola<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Tal Mizrahi<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-mir=
sky-sfc-pmamm-08.txt<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 8<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 :=
 2019-06-18<br>
<br>
Abstract:<br>
=C2=A0 =C2=A0This document describes how the alternate marking method can b=
e used<br>
=C2=A0 =C2=A0as the efficient performance measurement method taking advanta=
ge of<br>
=C2=A0 =C2=A0the actual data flows in a Service Function Chaining (SFC) dom=
ain.<br>
<br>
<br>
The IETF datatracker status page for this draft is:<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-mirsky-sfc-pmamm/" rel=3D=
"noreferrer" target=3D"_blank">https://datatracker.ietf.org/doc/draft-mirsk=
y-sfc-pmamm/</a><br>
<br>
There are also htmlized versions available at:<br>
<a href=3D"https://tools.ietf.org/html/draft-mirsky-sfc-pmamm-08" rel=3D"no=
referrer" target=3D"_blank">https://tools.ietf.org/html/draft-mirsky-sfc-pm=
amm-08</a><br>
<a href=3D"https://datatracker.ietf.org/doc/html/draft-mirsky-sfc-pmamm-08"=
 rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/doc/html=
/draft-mirsky-sfc-pmamm-08</a><br>
<br>
A diff from the previous version is available at:<br>
<a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-mirsky-sfc-pmamm-08" r=
el=3D"noreferrer" target=3D"_blank">https://www.ietf.org/rfcdiff?url2=3Ddra=
ft-mirsky-sfc-pmamm-08</a><br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
Internet-Drafts are also available by anonymous FTP at:<br>
<a href=3D"ftp://ftp.ietf.org/internet-drafts/" rel=3D"noreferrer" target=
=3D"_blank">ftp://ftp.ietf.org/internet-drafts/</a><br>
<br>
_______________________________________________<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" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/sfc</a><br>
</div></div></div>

--000000000000065c9f058ba41236--


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Wed, 19 Jun 2019 14:11:49 +0900
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To: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>
Cc: "sfc@ietf.org" <sfc@ietf.org>, Adrian Farrel <adrian@olddog.co.uk>,  "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/sfc/Z0mk1GpxIs1opchwnUCeFDmDfW8>
Subject: Re: [sfc] I-D Action: draft-ietf-sfc-oam-framework-07.txt
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Hi Nagendra, Authors,
thank you for your considerations of my comments and responding with very
expedient updates. I'll read the new version and share my feedback next
week.

Regards,
Greg

On Tue, Jun 18, 2019 at 10:45 PM Nagendra Kumar Nainar (naikumar) <
naikumar@cisco.com> wrote:

> Hi,
>
> Thanks to Mohamed, Adrian, and Greg for the great comments. This version
> addresses the same. Please review and let us know your thoughts.
>
> Thanks,
> Nagendra
>
> =EF=BB=BFOn 6/18/19, 9:44 AM, "sfc on behalf of internet-drafts@ietf.org"=
 <
> sfc-bounces@ietf.org on behalf of internet-drafts@ietf.org> wrote:
>
>
>     A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
>     This draft is a work item of the Service Function Chaining WG of the
> IETF.
>
>             Title           : Service Function Chaining (SFC) Operations,
> Administration and Maintenance (OAM) Framework
>             Authors         : Sam K. Aldrin
>                               Carlos Pignataro
>                               Nagendra Kumar
>                               Nobo Akiya
>                               Ram Krishnan
>                               Anoop Ghanwani
>         Filename        : draft-ietf-sfc-oam-framework-07.txt
>         Pages           : 19
>         Date            : 2019-06-18
>
>     Abstract:
>        This document provides a reference framework for Operations,
>        Administration and Maintenance (OAM) for Service Function Chaining
>        (SFC).
>
>
>
>     The IETF datatracker status page for this draft is:
>     https://datatracker.ietf.org/doc/draft-ietf-sfc-oam-framework/
>
>     There are also htmlized versions available at:
>     https://tools.ietf.org/html/draft-ietf-sfc-oam-framework-07
>     https://datatracker.ietf.org/doc/html/draft-ietf-sfc-oam-framework-07
>
>     A diff from the previous version is available at:
>     https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-sfc-oam-framework-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/
>
>     _______________________________________________
>     sfc mailing list
>     sfc@ietf.org
>     https://www.ietf.org/mailman/listinfo/sfc
>
>
>

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<div dir=3D"ltr">Hi Nagendra, Authors,<div>thank you for your consideration=
s of my comments and responding with very expedient updates. I&#39;ll read =
the new version and share my feedback next week.</div><div><br></div><div>R=
egards,</div><div>Greg</div></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Tue, Jun 18, 2019 at 10:45 PM Nagendra Kum=
ar Nainar (naikumar) &lt;<a href=3D"mailto:naikumar@cisco.com">naikumar@cis=
co.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"m=
argin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left=
:1ex">Hi,<br>
<br>
Thanks to Mohamed, Adrian, and Greg for the great comments. This version ad=
dresses the same. Please review and let us know your thoughts.<br>
<br>
Thanks,<br>
Nagendra<br>
<br>
=EF=BB=BFOn 6/18/19, 9:44 AM, &quot;sfc on behalf of <a href=3D"mailto:inte=
rnet-drafts@ietf.org" target=3D"_blank">internet-drafts@ietf.org</a>&quot; =
&lt;<a href=3D"mailto:sfc-bounces@ietf.org" target=3D"_blank">sfc-bounces@i=
etf.org</a> on behalf of <a href=3D"mailto:internet-drafts@ietf.org" target=
=3D"_blank">internet-drafts@ietf.org</a>&gt; wrote:<br>
<br>
<br>
=C2=A0 =C2=A0 A New Internet-Draft is available from the on-line Internet-D=
rafts directories.<br>
=C2=A0 =C2=A0 This draft is a work item of the Service Function Chaining WG=
 of the IETF.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0: Service Function Chaining (SFC) Operations, Administration a=
nd Maintenance (OAM) Framework<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Authors=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0: Sam K. Aldrin<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Carlos Pignataro<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Nagendra Kumar<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Nobo Akiya<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Ram Krishnan<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Anoop Ghanwani<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-iet=
f-sfc-oam-framework-07.txt<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 19<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 :=
 2019-06-18<br>
<br>
=C2=A0 =C2=A0 Abstract:<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0This document provides a reference framework for=
 Operations,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0Administration and Maintenance (OAM) for Service=
 Function Chaining<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0(SFC).<br>
<br>
<br>
<br>
=C2=A0 =C2=A0 The IETF datatracker status page for this draft is:<br>
=C2=A0 =C2=A0 <a href=3D"https://datatracker.ietf.org/doc/draft-ietf-sfc-oa=
m-framework/" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf=
.org/doc/draft-ietf-sfc-oam-framework/</a><br>
<br>
=C2=A0 =C2=A0 There are also htmlized versions available at:<br>
=C2=A0 =C2=A0 <a href=3D"https://tools.ietf.org/html/draft-ietf-sfc-oam-fra=
mework-07" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html=
/draft-ietf-sfc-oam-framework-07</a><br>
=C2=A0 =C2=A0 <a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-s=
fc-oam-framework-07" rel=3D"noreferrer" target=3D"_blank">https://datatrack=
er.ietf.org/doc/html/draft-ietf-sfc-oam-framework-07</a><br>
<br>
=C2=A0 =C2=A0 A diff from the previous version is available at:<br>
=C2=A0 =C2=A0 <a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-sfc=
-oam-framework-07" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.or=
g/rfcdiff?url2=3Ddraft-ietf-sfc-oam-framework-07</a><br>
<br>
<br>
=C2=A0 =C2=A0 Please note that it may take a couple of minutes from the tim=
e of submission<br>
=C2=A0 =C2=A0 until the htmlized version and diff are available at <a href=
=3D"http://tools.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.=
org</a>.<br>
<br>
=C2=A0 =C2=A0 Internet-Drafts are also available by anonymous FTP at:<br>
=C2=A0 =C2=A0 <a href=3D"ftp://ftp.ietf.org/internet-drafts/" rel=3D"norefe=
rrer" target=3D"_blank">ftp://ftp.ietf.org/internet-drafts/</a><br>
<br>
=C2=A0 =C2=A0 _______________________________________________<br>
=C2=A0 =C2=A0 sfc mailing list<br>
=C2=A0 =C2=A0 <a href=3D"mailto:sfc@ietf.org" target=3D"_blank">sfc@ietf.or=
g</a><br>
=C2=A0 =C2=A0 <a href=3D"https://www.ietf.org/mailman/listinfo/sfc" rel=3D"=
noreferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/sfc</a>=
<br>
<br>
<br>
</blockquote></div>

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--_000_C7D91C4DA0E44A8D9F59BC9AD03464F7ciscocom_--


From nobody Tue Jun 25 19:39:04 2019
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Subject: [sfc] I-D Action: draft-ietf-sfc-oam-framework-08.txt
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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 WG of the IETF.

        Title           : Service Function Chaining (SFC) Operations, Administration and Maintenance (OAM) Framework
        Authors         : Sam K. Aldrin
                          Carlos Pignataro
                          Nagendra Kumar
                          Ram Krishnan
                          Anoop Ghanwani
	Filename        : draft-ietf-sfc-oam-framework-08.txt
	Pages           : 20
	Date            : 2019-06-25

Abstract:
   This document provides a reference framework for Operations,
   Administration and Maintenance (OAM) for Service Function Chaining
   (SFC).



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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-sfc-oam-framework-08
https://datatracker.ietf.org/doc/html/draft-ietf-sfc-oam-framework-08

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


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From nobody Thu Jun 27 19:56:42 2019
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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 WG of the IETF.

        Title           : Service Function Chaining (SFC) Operations, Administration and Maintenance (OAM) Framework
        Authors         : Sam K. Aldrin
                          Carlos Pignataro
                          Nagendra Kumar
                          Ram Krishnan
                          Anoop Ghanwani
	Filename        : draft-ietf-sfc-oam-framework-09.txt
	Pages           : 20
	Date            : 2019-06-27

Abstract:
   This document provides a reference framework for Operations,
   Administration and Maintenance (OAM) for Service Function Chaining
   (SFC).



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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-sfc-oam-framework-09
https://datatracker.ietf.org/doc/html/draft-ietf-sfc-oam-framework-09

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-oam-framework-09


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/

