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From: "Lubashev, Igor" <ilubashe@akamai.com>
To: "Bulgarella Fabio (Guest)" <fabio.bulgarella=40guest.telecomitalia.it@dmarc.ietf.org>, Ian Swett <ianswett@google.com>, "draft-cfb-ippm-spinbit-measurements@ietf.org" <draft-cfb-ippm-spinbit-measurements@ietf.org>
CC: "isabelle.hamchaoui@orange.com" <isabelle.hamchaoui@orange.com>, "quic@ietf.org" <quic@ietf.org>, "alexandre.ferrieux@orange.com" <alexandre.ferrieux@orange.com>, "IETF IPPM WG (ippm@ietf.org)" <ippm@ietf.org>
Thread-Topic: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-spinbit-measurements)
Thread-Index: AdYNfRCPTsr9cJpyT2q4st79g+H+ngAiuRSAAlAHJ8AAbNOfAAAgNAaQAQJYd4ACD1TrQA==
Date: Sat, 9 May 2020 06:00:10 +0000
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References: <3ca3b5aae01d4650a3451639268b3f1e@TELMBXD14BA020.telecomitalia.local> <CAKcm_gMEELBizN_h5+s3Ow0LKXEgTRGg+-AqzJMZXVBDwQcDLA@mail.gmail.com>, <6b9e74ac94114d28ae4a66f1e9625ebd@usma1ex-dag1mb6.msg.corp.akamai.com> <1587582698016.72632@guest.telecomitalia.it>, <676f723b239b42ab9992780c440c5297@usma1ex-dag1mb6.msg.corp.akamai.com> <1588081856900.50391@guest.telecomitalia.it>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ippm/4db4myngzlLXvzWpTvbHkNqh5OI>
Subject: Re: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-spinbit-measurements)
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From: Tal Mizrahi <tal.mizrahi.phd@gmail.com>
Date: Mon, 11 May 2020 08:49:30 +0300
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Subject: [ippm] Hop Count in IOAM Direct Exporting
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Hi,

This issue has been raised a number of times, but we have not been
able to get a clear answer from the working group so far, and this is
the major remaining issue in draft-ietf-ippm-ioam-direct-export.
https://tools.ietf.org/html/draft-ioamteam-ippm-ioam-direct-export-00

The issue is whether to add an explicit Hop Count field to the Direct
Exporting header, or to rely on the existing Hop_Lim data field which
has already been defined in draft-ietf-ippm-ioam-data.

We would like to solicit comments from the WG and a clear opinion
about whether you support option 1 or option 2:
Option 1: use an explicit Hop Count field.
Option 2: use the existing Hop_Lim data field.

Thanks,
Tal.


The pros / cons of each option is presented in Section 7 of
draft-ioamteam-ippm-ioam-direct-export-00 as follows:

   o  Hop Limit / Hop Count: in order to help correlate and order the
      exported packets, it is possible to include a 1-octet Hop Count
      field in the DEX header (presumably by claiming some space from
      the Flags field).  Its value starts from 0 at the encapsulating
      node and is incremented by each IOAM transit node that supports
      the DEX option.  The Hop Count field value is also included in the
      exported packet.  An alternative approach is to use the Hop_Lim/
      Node_ID data field; if the IOAM-Trace-Type
      [I-D.ietf-ippm-ioam-data] has the Hop_Lim/Node_ID bit set, then
      exported packets include the Hop_Lim/Node_ID data field, which
      contains the TTL/Hop Limit value from a lower layer protocol.  The
      main advantage of the Hop_Lim/Node_ID approach is that it provides
      information about the current hop count without requiring each
      transit node to modify the DEX option, thus simplifying the data
      plane functionality of Direct Exporting.  The main advantage of
      the Hop Count approach is that it counts the number of IOAM-
      capable nodes without relying on the lower layer TTL, especially
      when the lower layer cannot prvide the accurate TTL information,
      e.g., Layer 2 Ethernet or hierarchical VPN.  It also explicitly
      allows to detect a case where an IOAM-capable node fails to export
      packets to the collector.  In order to facilitate the Hop Count
      approach it is possible to use a flag to indicate an optional Hop
      Count field, which enables to control the tradeoff.  On one hand
      it addresses the use cases that the Hop_Lim/Node_ID cannot cover,
      and on the other hand it does not require transit switches to
      update the option if it is not supported or disabled.  Further
      discussion is required about the tradeoff between the two
      alternatives.


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From: Haoyu Song <haoyu.song@futurewei.com>
To: Tal Mizrahi <tal.mizrahi.phd@gmail.com>, IETF IPPM WG <ippm@ietf.org>
Thread-Topic: [ippm] Hop Count in IOAM Direct Exporting
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ippm/LJR0sWoGY5EST8XeaKLVx3kvZow>
Subject: Re: [ippm] Hop Count in IOAM Direct Exporting
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Hi WG,

"Hop Count" or the equivalent information is important to help correlate th=
e export data and ensure the completeness of the export data.  =09

Modifying the IOAM DEX option header (by incrementing the hop count) seems =
undesirable, but this is just a simple operation, and it's faster than tryi=
ng to retrieve information from elsewhere.=20

The alternative approach of using TTL is unreliable for the following reaso=
ns.
1. Depending on the application scenario, the TTL may not be available or b=
e hard to retrieve. (e.g., Layer 2, tunnel, etc.)
2. TTL, if exists, is updated per hop. The "hop count" is updated per IOAM =
DEX-enabled nodes. These two numbers are not equivalent. E.g.,=20
if TTL is used, two DEX export packets from different nodes reports two TTL=
 numbers 7 and 4, one will have no clue if this is because one or more
export packets are dropped, or some IOAM-DEX enabled nodes don't respond, o=
r some nodes on the path are not IOAM-DEX enabled. =20

If we can address the above issues, then the explicit "hop count" is not ne=
eded.=20

Best regards,
Haoyu
   =20

-----Original Message-----
From: ippm <ippm-bounces@ietf.org> On Behalf Of Tal Mizrahi
Sent: Sunday, May 10, 2020 10:50 PM
To: IETF IPPM WG <ippm@ietf.org>
Subject: [ippm] Hop Count in IOAM Direct Exporting

Hi,

This issue has been raised a number of times, but we have not been able to =
get a clear answer from the working group so far, and this is the major rem=
aining issue in draft-ietf-ippm-ioam-direct-export.
https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Ftools.i=
etf.org%2Fhtml%2Fdraft-ioamteam-ippm-ioam-direct-export-00&amp;data=3D02%7C=
01%7Chaoyu.song%40futurewei.com%7C59cddc7f25c14c51d39b08d7f56f4ce3%7C0fee8f=
f2a3b240189c753a1d5591fedc%7C1%7C0%7C637247730711329608&amp;sdata=3DptNRYLf=
lJtmTvx5G16yLSxTG2IHFG%2FCoMaPKcN3GViU%3D&amp;reserved=3D0

The issue is whether to add an explicit Hop Count field to the Direct Expor=
ting header, or to rely on the existing Hop_Lim data field which has alread=
y been defined in draft-ietf-ippm-ioam-data.

We would like to solicit comments from the WG and a clear opinion about whe=
ther you support option 1 or option 2:
Option 1: use an explicit Hop Count field.
Option 2: use the existing Hop_Lim data field.

Thanks,
Tal.


The pros / cons of each option is presented in Section 7 of
draft-ioamteam-ippm-ioam-direct-export-00 as follows:

   o  Hop Limit / Hop Count: in order to help correlate and order the
      exported packets, it is possible to include a 1-octet Hop Count
      field in the DEX header (presumably by claiming some space from
      the Flags field).  Its value starts from 0 at the encapsulating
      node and is incremented by each IOAM transit node that supports
      the DEX option.  The Hop Count field value is also included in the
      exported packet.  An alternative approach is to use the Hop_Lim/
      Node_ID data field; if the IOAM-Trace-Type
      [I-D.ietf-ippm-ioam-data] has the Hop_Lim/Node_ID bit set, then
      exported packets include the Hop_Lim/Node_ID data field, which
      contains the TTL/Hop Limit value from a lower layer protocol.  The
      main advantage of the Hop_Lim/Node_ID approach is that it provides
      information about the current hop count without requiring each
      transit node to modify the DEX option, thus simplifying the data
      plane functionality of Direct Exporting.  The main advantage of
      the Hop Count approach is that it counts the number of IOAM-
      capable nodes without relying on the lower layer TTL, especially
      when the lower layer cannot prvide the accurate TTL information,
      e.g., Layer 2 Ethernet or hierarchical VPN.  It also explicitly
      allows to detect a case where an IOAM-capable node fails to export
      packets to the collector.  In order to facilitate the Hop Count
      approach it is possible to use a flag to indicate an optional Hop
      Count field, which enables to control the tradeoff.  On one hand
      it addresses the use cases that the Hop_Lim/Node_ID cannot cover,
      and on the other hand it does not require transit switches to
      update the option if it is not supported or disabled.  Further
      discussion is required about the tradeoff between the two
      alternatives.

_______________________________________________
ippm mailing list
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From: "Ramesh Sivakolundu (sramesh)" <sramesh@cisco.com>
To: Haoyu Song <haoyu.song@futurewei.com>, Tal Mizrahi <tal.mizrahi.phd@gmail.com>, IETF IPPM WG <ippm@ietf.org>
Thread-Topic: [ippm] Hop Count in IOAM Direct Exporting
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Subject: Re: [ippm] Hop Count in IOAM Direct Exporting
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From: Barak Gafni <gbarak@mellanox.com>
To: "Ramesh Sivakolundu (sramesh)" <sramesh=40cisco.com@dmarc.ietf.org>, Haoyu Song <haoyu.song@futurewei.com>, Tal Mizrahi <tal.mizrahi.phd@gmail.com>,  IETF IPPM WG <ippm@ietf.org>
Thread-Topic: [ippm] Hop Count in IOAM Direct Exporting
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Subject: Re: [ippm] Hop Count in IOAM Direct Exporting
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From: Haoyu Song <haoyu.song@futurewei.com>
To: "Ramesh Sivakolundu (sramesh)" <sramesh@cisco.com>, Tal Mizrahi <tal.mizrahi.phd@gmail.com>, IETF IPPM WG <ippm@ietf.org>
Thread-Topic: [ippm] Hop Count in IOAM Direct Exporting
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Subject: Re: [ippm] Hop Count in IOAM Direct Exporting
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From: Haoyu Song <haoyu.song@futurewei.com>
To: Barak Gafni <gbarak@mellanox.com>, "Ramesh Sivakolundu (sramesh)" <sramesh=40cisco.com@dmarc.ietf.org>, Tal Mizrahi <tal.mizrahi.phd@gmail.com>, IETF IPPM WG <ippm@ietf.org>
Thread-Topic: [ippm] Hop Count in IOAM Direct Exporting
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Subject: Re: [ippm] Hop Count in IOAM Direct Exporting
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From: Mickey Spiegel <mspiegel@barefootnetworks.com>
Date: Mon, 11 May 2020 12:57:06 -0700
Message-ID: <CACYmcDrWnvy0115xGTRfVKcVenv6D5XAV0TXEuRGAPza9PaQeA@mail.gmail.com>
To: Haoyu Song <haoyu.song@futurewei.com>
Cc: Tal Mizrahi <tal.mizrahi.phd@gmail.com>, IETF IPPM WG <ippm@ietf.org>
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Subject: Re: [ippm] Hop Count in IOAM Direct Exporting
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Haoyu,

You are trying to position this as anything providing any amount of
incremental value is worth it. I don't agree with that. This is a judgement
call, balancing the pros and cons before coming up with a final decision.

While the Hop Count that you are proposing does have value in some corner
cases and complex deployment scenarios, it does not add value in the
majority of common cases and deployment scenarios. In an L3 network where
every node supports IOAM there is no benefit. When the topology is known
there is no benefit. Moreover, there is a clear cost, making transit
devices modify the header when it would otherwise be unnecessary.

I prefer option 2, using the existing Hop_Lim data field.

Mickey

On Mon, May 11, 2020 at 11:18 AM Haoyu Song <haoyu.song@futurewei.com>
wrote:

> Hi WG,
>
> "Hop Count" or the equivalent information is important to help correlate
> the export data and ensure the completeness of the export data.
>
> Modifying the IOAM DEX option header (by incrementing the hop count) seem=
s
> undesirable, but this is just a simple operation, and it's faster than
> trying to retrieve information from elsewhere.
>
> The alternative approach of using TTL is unreliable for the following
> reasons.
> 1. Depending on the application scenario, the TTL may not be available or
> be hard to retrieve. (e.g., Layer 2, tunnel, etc.)
> 2. TTL, if exists, is updated per hop. The "hop count" is updated per IOA=
M
> DEX-enabled nodes. These two numbers are not equivalent. E.g.,
> if TTL is used, two DEX export packets from different nodes reports two
> TTL numbers 7 and 4, one will have no clue if this is because one or more
> export packets are dropped, or some IOAM-DEX enabled nodes don't respond,
> or some nodes on the path are not IOAM-DEX enabled.
>
> If we can address the above issues, then the explicit "hop count" is not
> needed.
>
> Best regards,
> Haoyu
>
>
> -----Original Message-----
> From: ippm <ippm-bounces@ietf.org> On Behalf Of Tal Mizrahi
> Sent: Sunday, May 10, 2020 10:50 PM
> To: IETF IPPM WG <ippm@ietf.org>
> Subject: [ippm] Hop Count in IOAM Direct Exporting
>
> Hi,
>
> This issue has been raised a number of times, but we have not been able t=
o
> get a clear answer from the working group so far, and this is the major
> remaining issue in draft-ietf-ippm-ioam-direct-export.
>
> https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Ftools=
.ietf.org%2Fhtml%2Fdraft-ioamteam-ippm-ioam-direct-export-00&amp;data=3D02%=
7C01%7Chaoyu.song%40futurewei.com%7C59cddc7f25c14c51d39b08d7f56f4ce3%7C0fee=
8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637247730711329608&amp;sdata=3DptNRY=
LflJtmTvx5G16yLSxTG2IHFG%2FCoMaPKcN3GViU%3D&amp;reserved=3D0
>
> The issue is whether to add an explicit Hop Count field to the Direct
> Exporting header, or to rely on the existing Hop_Lim data field which has
> already been defined in draft-ietf-ippm-ioam-data.
>
> We would like to solicit comments from the WG and a clear opinion about
> whether you support option 1 or option 2:
> Option 1: use an explicit Hop Count field.
> Option 2: use the existing Hop_Lim data field.
>
> Thanks,
> Tal.
>
>
> The pros / cons of each option is presented in Section 7 of
> draft-ioamteam-ippm-ioam-direct-export-00 as follows:
>
>    o  Hop Limit / Hop Count: in order to help correlate and order the
>       exported packets, it is possible to include a 1-octet Hop Count
>       field in the DEX header (presumably by claiming some space from
>       the Flags field).  Its value starts from 0 at the encapsulating
>       node and is incremented by each IOAM transit node that supports
>       the DEX option.  The Hop Count field value is also included in the
>       exported packet.  An alternative approach is to use the Hop_Lim/
>       Node_ID data field; if the IOAM-Trace-Type
>       [I-D.ietf-ippm-ioam-data] has the Hop_Lim/Node_ID bit set, then
>       exported packets include the Hop_Lim/Node_ID data field, which
>       contains the TTL/Hop Limit value from a lower layer protocol.  The
>       main advantage of the Hop_Lim/Node_ID approach is that it provides
>       information about the current hop count without requiring each
>       transit node to modify the DEX option, thus simplifying the data
>       plane functionality of Direct Exporting.  The main advantage of
>       the Hop Count approach is that it counts the number of IOAM-
>       capable nodes without relying on the lower layer TTL, especially
>       when the lower layer cannot prvide the accurate TTL information,
>       e.g., Layer 2 Ethernet or hierarchical VPN.  It also explicitly
>       allows to detect a case where an IOAM-capable node fails to export
>       packets to the collector.  In order to facilitate the Hop Count
>       approach it is possible to use a flag to indicate an optional Hop
>       Count field, which enables to control the tradeoff.  On one hand
>       it addresses the use cases that the Hop_Lim/Node_ID cannot cover,
>       and on the other hand it does not require transit switches to
>       update the option if it is not supported or disabled.  Further
>       discussion is required about the tradeoff between the two
>       alternatives.
>
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
>
> https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.i=
etf.org%2Fmailman%2Flistinfo%2Fippm&amp;data=3D02%7C01%7Chaoyu.song%40futur=
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> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm
>

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<div dir=3D"ltr"><div>Haoyu,</div><div><br></div><div>You are trying to pos=
ition this as anything providing any amount of incremental value is worth i=
t. I don&#39;t agree with that. This is a judgement call, balancing the pro=
s and cons before coming up with a final decision.</div><div><br></div><div=
>While the Hop Count that you are proposing does have value in some corner =
cases and complex deployment scenarios, it does not add value in the majori=
ty of common cases and deployment scenarios. In an L3 network where every n=
ode supports IOAM there is no benefit. When the topology is known there is =
no benefit. Moreover, there is a clear cost, making transit devices modify =
the header when it would otherwise be unnecessary.</div><div><br></div><div=
>I prefer option 2, using the existing Hop_Lim data field.</div><div><br></=
div><div>Mickey</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Mon, May 11, 2020 at 11:18 AM Haoyu Song &lt;<a href=3D"=
mailto:haoyu.song@futurewei.com">haoyu.song@futurewei.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">Hi WG,<br>
<br>
&quot;Hop Count&quot; or the equivalent information is important to help co=
rrelate the export data and ensure the completeness of the export data.=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 <br>
<br>
Modifying the IOAM DEX option header (by incrementing the hop count) seems =
undesirable, but this is just a simple operation, and it&#39;s faster than =
trying to retrieve information from elsewhere. <br>
<br>
The alternative approach of using TTL is unreliable for the following reaso=
ns.<br>
1. Depending on the application scenario, the TTL may not be available or b=
e hard to retrieve. (e.g., Layer 2, tunnel, etc.)<br>
2. TTL, if exists, is updated per hop. The &quot;hop count&quot; is updated=
 per IOAM DEX-enabled nodes. These two numbers are not equivalent. E.g., <b=
r>
if TTL is used, two DEX export packets from different nodes reports two TTL=
 numbers 7 and 4, one will have no clue if this is because one or more<br>
export packets are dropped, or some IOAM-DEX enabled nodes don&#39;t respon=
d, or some nodes on the path are not IOAM-DEX enabled.=C2=A0 <br>
<br>
If we can address the above issues, then the explicit &quot;hop count&quot;=
 is not needed. <br>
<br>
Best regards,<br>
Haoyu<br>
<br>
<br>
-----Original Message-----<br>
From: ippm &lt;<a href=3D"mailto:ippm-bounces@ietf.org" target=3D"_blank">i=
ppm-bounces@ietf.org</a>&gt; On Behalf Of Tal Mizrahi<br>
Sent: Sunday, May 10, 2020 10:50 PM<br>
To: IETF IPPM WG &lt;<a href=3D"mailto:ippm@ietf.org" target=3D"_blank">ipp=
m@ietf.org</a>&gt;<br>
Subject: [ippm] Hop Count in IOAM Direct Exporting<br>
<br>
Hi,<br>
<br>
This issue has been raised a number of times, but we have not been able to =
get a clear answer from the working group so far, and this is the major rem=
aining issue in draft-ietf-ippm-ioam-direct-export.<br>
<a href=3D"https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2=
F%2Ftools.ietf.org%2Fhtml%2Fdraft-ioamteam-ippm-ioam-direct-export-00&amp;a=
mp;data=3D02%7C01%7Chaoyu.song%40futurewei.com%7C59cddc7f25c14c51d39b08d7f5=
6f4ce3%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637247730711329608&amp;=
amp;sdata=3DptNRYLflJtmTvx5G16yLSxTG2IHFG%2FCoMaPKcN3GViU%3D&amp;amp;reserv=
ed=3D0" rel=3D"noreferrer" target=3D"_blank">https://nam11.safelinks.protec=
tion.outlook.com/?url=3Dhttps%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ioamtea=
m-ippm-ioam-direct-export-00&amp;amp;data=3D02%7C01%7Chaoyu.song%40futurewe=
i.com%7C59cddc7f25c14c51d39b08d7f56f4ce3%7C0fee8ff2a3b240189c753a1d5591fedc=
%7C1%7C0%7C637247730711329608&amp;amp;sdata=3DptNRYLflJtmTvx5G16yLSxTG2IHFG=
%2FCoMaPKcN3GViU%3D&amp;amp;reserved=3D0</a><br>
<br>
The issue is whether to add an explicit Hop Count field to the Direct Expor=
ting header, or to rely on the existing Hop_Lim data field which has alread=
y been defined in draft-ietf-ippm-ioam-data.<br>
<br>
We would like to solicit comments from the WG and a clear opinion about whe=
ther you support option 1 or option 2:<br>
Option 1: use an explicit Hop Count field.<br>
Option 2: use the existing Hop_Lim data field.<br>
<br>
Thanks,<br>
Tal.<br>
<br>
<br>
The pros / cons of each option is presented in Section 7 of<br>
draft-ioamteam-ippm-ioam-direct-export-00 as follows:<br>
<br>
=C2=A0 =C2=A0o=C2=A0 Hop Limit / Hop Count: in order to help correlate and =
order the<br>
=C2=A0 =C2=A0 =C2=A0 exported packets, it is possible to include a 1-octet =
Hop Count<br>
=C2=A0 =C2=A0 =C2=A0 field in the DEX header (presumably by claiming some s=
pace from<br>
=C2=A0 =C2=A0 =C2=A0 the Flags field).=C2=A0 Its value starts from 0 at the=
 encapsulating<br>
=C2=A0 =C2=A0 =C2=A0 node and is incremented by each IOAM transit node that=
 supports<br>
=C2=A0 =C2=A0 =C2=A0 the DEX option.=C2=A0 The Hop Count field value is als=
o included in the<br>
=C2=A0 =C2=A0 =C2=A0 exported packet.=C2=A0 An alternative approach is to u=
se the Hop_Lim/<br>
=C2=A0 =C2=A0 =C2=A0 Node_ID data field; if the IOAM-Trace-Type<br>
=C2=A0 =C2=A0 =C2=A0 [I-D.ietf-ippm-ioam-data] has the Hop_Lim/Node_ID bit =
set, then<br>
=C2=A0 =C2=A0 =C2=A0 exported packets include the Hop_Lim/Node_ID data fiel=
d, which<br>
=C2=A0 =C2=A0 =C2=A0 contains the TTL/Hop Limit value from a lower layer pr=
otocol.=C2=A0 The<br>
=C2=A0 =C2=A0 =C2=A0 main advantage of the Hop_Lim/Node_ID approach is that=
 it provides<br>
=C2=A0 =C2=A0 =C2=A0 information about the current hop count without requir=
ing each<br>
=C2=A0 =C2=A0 =C2=A0 transit node to modify the DEX option, thus simplifyin=
g the data<br>
=C2=A0 =C2=A0 =C2=A0 plane functionality of Direct Exporting.=C2=A0 The mai=
n advantage of<br>
=C2=A0 =C2=A0 =C2=A0 the Hop Count approach is that it counts the number of=
 IOAM-<br>
=C2=A0 =C2=A0 =C2=A0 capable nodes without relying on the lower layer TTL, =
especially<br>
=C2=A0 =C2=A0 =C2=A0 when the lower layer cannot prvide the accurate TTL in=
formation,<br>
=C2=A0 =C2=A0 =C2=A0 e.g., Layer 2 Ethernet or hierarchical VPN.=C2=A0 It a=
lso explicitly<br>
=C2=A0 =C2=A0 =C2=A0 allows to detect a case where an IOAM-capable node fai=
ls to export<br>
=C2=A0 =C2=A0 =C2=A0 packets to the collector.=C2=A0 In order to facilitate=
 the Hop Count<br>
=C2=A0 =C2=A0 =C2=A0 approach it is possible to use a flag to indicate an o=
ptional Hop<br>
=C2=A0 =C2=A0 =C2=A0 Count field, which enables to control the tradeoff.=C2=
=A0 On one hand<br>
=C2=A0 =C2=A0 =C2=A0 it addresses the use cases that the Hop_Lim/Node_ID ca=
nnot cover,<br>
=C2=A0 =C2=A0 =C2=A0 and on the other hand it does not require transit swit=
ches to<br>
=C2=A0 =C2=A0 =C2=A0 update the option if it is not supported or disabled.=
=C2=A0 Further<br>
=C2=A0 =C2=A0 =C2=A0 discussion is required about the tradeoff between the =
two<br>
=C2=A0 =C2=A0 =C2=A0 alternatives.<br>
<br>
_______________________________________________<br>
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From: Haoyu Song <haoyu.song@futurewei.com>
To: Mickey Spiegel <mspiegel@barefootnetworks.com>
CC: Tal Mizrahi <tal.mizrahi.phd@gmail.com>, IETF IPPM WG <ippm@ietf.org>
Thread-Topic: [ippm] Hop Count in IOAM Direct Exporting
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From: "Ramesh Sivakolundu (sramesh)" <sramesh@cisco.com>
To: Haoyu Song <haoyu.song@futurewei.com>, Tal Mizrahi <tal.mizrahi.phd@gmail.com>, IETF IPPM WG <ippm@ietf.org>
Thread-Topic: [ippm] Hop Count in IOAM Direct Exporting
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Subject: Re: [ippm] Hop Count in IOAM Direct Exporting
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To: Haoyu Song <haoyu.song@futurewei.com>, Mickey Spiegel <mspiegel@barefootnetworks.com>
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Thread-Topic: [ippm] Hop Count in IOAM Direct Exporting
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Subject: Re: [ippm] Hop Count in IOAM Direct Exporting
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From: Haoyu Song <haoyu.song@futurewei.com>
To: "Ramesh Sivakolundu (sramesh)" <sramesh@cisco.com>, Tal Mizrahi <tal.mizrahi.phd@gmail.com>, IETF IPPM WG <ippm@ietf.org>
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Subject: Re: [ippm] Hop Count in IOAM Direct Exporting
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To: Haoyu Song <haoyu.song@futurewei.com>, Tal Mizrahi <tal.mizrahi.phd@gmail.com>, IETF IPPM WG <ippm@ietf.org>
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Subject: Re: [ippm] Hop Count in IOAM Direct Exporting
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From: Haoyu Song <haoyu.song@futurewei.com>
To: "Ramesh Sivakolundu (sramesh)" <sramesh@cisco.com>, Tal Mizrahi <tal.mizrahi.phd@gmail.com>, IETF IPPM WG <ippm@ietf.org>
Thread-Topic: [ippm] Hop Count in IOAM Direct Exporting
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ippm/vcCVfSB50YXoz1KllorDmFBaB6g>
Subject: Re: [ippm] Hop Count in IOAM Direct Exporting
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From: "Bulgarella Fabio (Guest)" <fabio.bulgarella@guest.telecomitalia.it>
To: "Lubashev, Igor" <ilubashe=40akamai.com@dmarc.ietf.org>, Ian Swett <ianswett@google.com>, "draft-cfb-ippm-spinbit-measurements@ietf.org" <draft-cfb-ippm-spinbit-measurements@ietf.org>
CC: "isabelle.hamchaoui@orange.com" <isabelle.hamchaoui@orange.com>, "quic@ietf.org" <quic@ietf.org>, "alexandre.ferrieux@orange.com" <alexandre.ferrieux@orange.com>, "IETF IPPM WG (ippm@ietf.org)" <ippm@ietf.org>
Thread-Topic: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-spinbit-measurements)
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Date: Thu, 14 May 2020 13:08:35 +0000
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Subject: Re: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-spinbit-measurements)
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Hi Igor and all QUIC/IPPM WG members,=0A=
=0A=
I think it's clear to everyone that both systems have advantages and disadv=
antages. In this email exchange, we both expressed our views on it.=0A=
At this point we would ask to WG members if they think it would be interest=
ing to see a comparative test between the two methodologies.=0A=
=0A=
Our proposal is to implement both solutions on a common implementation of t=
he QUIC protocol so that the same data flow can be marked using both techni=
ques (i.e., Qbit, Rbit and Lbit - borrowing the third most significant bit =
occupied by the spinbit) and analyzed using the two observers.=0A=
=0A=
Waiting for your feedbacks on this proposal,=0A=
Best regards.=0A=
=0A=
Fabio, Mauro, Massimo, Giuseppe and Riccardo=0A=
=0A=
=0A=
________________________________________=0A=
Da: Lubashev, Igor <ilubashe=3D40akamai.com@dmarc.ietf.org>=0A=
Inviato: sabato 9 maggio 2020 08:00=0A=
A: Bulgarella Fabio (Guest); Ian Swett; draft-cfb-ippm-spinbit-measurements=
@ietf.org=0A=
Cc: isabelle.hamchaoui@orange.com; quic@ietf.org; alexandre.ferrieux@orange=
.com; IETF IPPM WG (ippm@ietf.org)=0A=
Oggetto: [EXT] RE: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-=
spinbit-measurements)=0A=
=0A=
Fabio,=0A=
=0A=
I think we are in a complete agreement that any loss reporting is a very us=
eful extension =96 both for monitoring the network and for troubleshooting =
individual flows. I think we agree that L-bit and R-bit are better than not=
hing.  The disagreement is about the relative fitness for the purpose and e=
ase of deployability.=0A=
=0A=
I would also welcome other people to weigh in with novel insights.  Maybe m=
ore people will catch up on both drafts before the next IETF.=0A=
=0A=
I am happy to get into the details of each point (inline), but my biggest c=
oncern is aligned with Dmitri=92s concern that:=0A=
=0A=
   (a) Simultaneous captures/observations by different organizations of inf=
requently occurring events is a futile proposition, and=0A=
   (b) A very large percentage of internet flows is asymmetric.=0A=
=0A=
As a result, a method that relies of either of these properties is limiting=
 its utility for troubleshooting customer problems.=0A=
=0A=
(The rest of the comments are inline)=0A=
=0A=
> On Tue, April 28, 2020 at 9:51 AM, Bulgarella Fabio (Guest) <fabio.bulgar=
ella=3D40guest.telecomitalia.it@dmarc.ietf.org> wrote:=0A=
>=0A=
> Hello Igor,=0A=
> thanks for your reply.=0A=
>=0A=
> This exchange of e-mails is very useful to understand which of the two so=
lutions has the best balance between positive and negative aspects,=0A=
> at least in the measurement scenarios of interest for telecommunication o=
perators. The important thing is that one of the two solution is=0A=
> chosen and a packet loss feature is finally included in the Quic protocol=
 (after the necessary checks in terms of privacy and security).=0A=
> However, we can already say, from the point of view of Telecom Italia and=
 Orange, that the Qbit is a fixed point of this type of measures.=0A=
> It remains to decide which is better between L-bit and R-bit.=0A=
>=0A=
> First of all, let's remember the reasons that led us to design the Rbit.=
=0A=
> We found some weaknesses in the Lbit:=0A=
>=0A=
> - the LBit logic is strictly tied to the protocol implementation.=0A=
> For example in LSQUIC there are 6 different hook points where this variab=
le is set. QL performance mechanism logic is intertwined with=0A=
> the protocol logic. So, the concern here is that future changes in the pr=
otocol or in new implementations need a careful analysis of the=0A=
> code to avoid different behaviors and different measurement results;=0A=
=0A=
The quality of the implementation of each stack is mostly related to the im=
plementor.  The behavior for both L-bit and R-bit is specified by the stand=
ards, so if the standards are implemented correctly, no analysis of the imp=
lementation should be needed.=0A=
=0A=
> - loss of packets carrying only ACK frames (are detected?).=0A=
> We saw in the Montreal demo (using Ericsson SpinDump tool), the last July=
, that if Quic packets only contain ACK frames the Lbit is not set.=0A=
> Actually, during a file download we inserted losses in the upload directi=
on that were not detected by the system.=0A=
> Alexandre confirmed this behavior. Have you changed something since then?=
=0A=
=0A=
With QL-bits, each endpoint is free to implement or NOT implement the marki=
ng.  The beauty of the QL scheme is that if an endpoint chooses to mark pac=
kets, those markings are sufficient to signal upstream and downstream loss =
of all packets sent by THAT endpoint. In the implementation you are referri=
ng to, it looks like the client endpoint did NOT choose to implement QL mar=
kings, so its packets (pure ACKs) did not provide loss signaling.  If the c=
lient did implement QL, those pure ACKs would report losses all the same.=
=0A=
=0A=
> - the loss measurement signal is inaccurate in case of losses:=0A=
> The Lbit is a simple signaling protocol. If you miss a Lbit marked packet=
 you miss a signal of loss. If losses are not equally distributed between=
=0A=
> L-marked and not L-marked packets, it's very likely that the produced mea=
surements are wrong or at least inaccurate. The two approaches=0A=
> are completely different. Rbit works exactly as the Qbit. It counts the l=
ost packets, it's not a signaling. So, as the Qbit, the correct percentage=
=0A=
> of lost packets is detected.=0A=
=0A=
There is no difference between QL- and QR- schemes in regard to the signal =
quality in case a loss of packets with the signal. As you note, we discuss =
in the draft that it is conceivable for a somewhat different loss ratio for=
 packets w/ L=3D0 and L=3D1 for QL-bit scheme. Likewise, it is conceivable =
for a different loss ratio for packets belonging to =93shorter=94 and =93lo=
nger=94 R-trains for QR-bit scheme. After all, when there are losses to rep=
ort (shorter R trains), the ACKs will be sent more frequently, increasing t=
he chance of the return path congestion.=0A=
=0A=
> Now some inline answers to your considerations, even though at this point=
 it would be convenient to organize a comparison involving also=0A=
> other people interested in the topic, maybe in a next IETF meeting. We ar=
e also available to carry out comparative tests on the same flows=0A=
> (marking simultaneously with both solutions) using for example the Ericss=
on SpinDump tool which has already been used in the previous=0A=
> hackathons as QUIC performance measurement tool.=0A=
>=0A=
>> Strong reordering exists.  That=92s why we are recommending the minimum =
Q to be 64. This comes from real data, not lab data.=0A=
>> If 5 packets were enough to tell the end of marking periods, we would ha=
d recommended minimum Q to be 8.=0A=
>=0A=
> The length of the period is not chosen only in function of reordering but=
 also to avoid that burst losses completely cancel one or more periods.=0A=
=0A=
That's right, that is a factor also.  However, we have not observed losses =
that obliterate several dozens of consecutive packets, though I am sure the=
y exist somewhere.  Consistent packet reordering of that magnitude we did s=
ee.=0A=
=0A=
> However, stimulated by Igor's concerns, we thought of an improvement rega=
rding the tolerance of our system against out of sequence.=0A=
> In a nutshell, it would be possible to intercept reordered packets receiv=
ed after the detection of an incoming "Qbit marking period", using them=0A=
> to update the computed average until the current "Rbit marking period" is=
 completed in generation.=0A=
=0A=
Sure, though the receiver endpoint has access to the packet numbers and kno=
ws the loss rate exactly and can signal it directly.=0A=
=0A=
> After the necessary laboratory tests, we could add this new feature to th=
e next revision of our draft.=0A=
>=0A=
> R signal is still going to be significantly delayed, especially with slow=
er connections (not every connection is going to be streaming media at a=0A=
> sustained rate of 15Mbps). So if for a 15Mbps average-rate connection you=
 can expect to see R-signal with a delay between 8-RTTs (1:2 ACK)=0A=
> and 38-RTTs (1:10 ACK), the delay increases to 24-RTTs and 114-RTTs for a=
 5Mbps average-rate connection.=0A=
>=0A=
> As already said in the previous mail, based on our tests, this is not a b=
ig problem because it's still possible to obtain enough measurements to=0A=
> evaluate the packet loss of a session. Moreover, the measurement delay is=
 shortened when packet loss occurs.=0A=
=0A=
It depends.  For a large media download it is probably enough data for gene=
ric network monitoring.  It would not work for shorter flows.  Also, as I s=
howed above, even with an ack2 policy, you may get a 38-RTT delay for very =
realistic network media flows, which will make troubleshooting specific flo=
ws difficult.=0A=
=0A=
>> L-bit signal provides a crisp shape of the loss =96 whether it is random=
 loss, or packets are lost of batches (and how many packets are in a loss b=
atch).=0A=
> By contrast, R-signal only indicates an average loss over 2 to 10 Q-bit m=
arking periods.  The share of the loss is erased. I think for that alone, L=
-signal=0A=
> is more useful for troubleshooting.=0A=
>=0A=
> Although we calculate the E2E loss through an average (only if the reflec=
tion is on a slower channel than the signal reception channel), we are stil=
l=0A=
> able to accurately calculate the loss using a correction factor (see http=
s: //tools.ietf.org/html/draft-cfb-ippm-spinbit-measurements-00#section-7.4=
).=0A=
=0A=
I think you did not understand the concern here.  The specific shape of the=
 loss may be very useful for a network troubleshooting.  QL-signal allows o=
ne to observe the precise shape of the loss.  QR-scheme only gets you an av=
erage rate over multiple RTTs.=0A=
=0A=
In fact, even if the loss is on the slower channel and reflection is on the=
 faster channel, QR only gets an average loss rate rather then the precise =
shape of the loss.=0A=
=0A=
>> This is an important difference, and it seems accurate on its surface.  =
In reality, every QUIC implementation will keep track of packets and declar=
e them=0A=
>> lost for the purposes of data retransmission and/or congestion control. =
 The timing and details of when packets are declared lost (L-bit signal) wi=
ll vary.=0A=
>> Likewise, every QUIC implementation will send some ACKs, but their timin=
g and frequency (R-signal) will vary.  R-signal quality will also heavily d=
epend=0A=
>> on the =93marking period detection=94 implementation quality and =93Q-si=
gnal averaging=94 implementation details.=0A=
>=0A=
> See first point in the L-bit weeknesses paragraph. Moreover, the two func=
tions "marking period detection" and "Q-signal averaging", really simple in=
=0A=
> implementation, are completely detached from the rest of the protocol log=
ic and their behaviors are expressly indicated in the draft.=0A=
=0A=
There is no particular L-bit weakness here.  See my comment above =96 the p=
recise timings of the signals will vary in both approaches.  The timing of =
L-bit will vary based on the sender=92s loss detection.  The timing of R-bi=
t will vary based on the receiver=92s ACK policy (and also the details of t=
heir =93reordering mitigation=94 algorithms).=0A=
=0A=
>> Also, accurate accounting with QR scheme requires correlation of both di=
rections, with the R-bit direction significantly lagging the Q-bit directio=
n.=0A=
>> It should be understood how this scheme behaves in cases of changing Con=
nection IDs.=0A=
>=0A=
> We do not see the problem of implementing the solution on both endpoints =
since generally the client, unlike the server, does not have scalability pr=
oblems.=0A=
> So if you implement it on the server it costs nothing to implement it on =
the client as well.=0A=
=0A=
There is no scalability concern for the QL implementation at all.  It is ju=
st two counters that are incremented and decremented.=0A=
=0A=
The real concern is developer skills and developer resources.  Servers typi=
cally have substantial development organizations that will get it right. Ex=
cept for a handful of most popular desktop and phone clients, however, clie=
nts have very limited developer support and update story. A lot of bits are=
 pushed by clients built into various streaming devices, smart TVs, set top=
 boxes, BluRay players, and some such.  Their implementations tend to be mi=
nimal and somewhat sloppy, and their upgrade path is sporadic at best.=0A=
=0A=
Best regards,=0A=
=0A=
- Igor=0A=
=0A=
________________________________________=0A=
Da: Lubashev, Igor <mailto:ilubashe=3D40akamai.com@dmarc.ietf.org>=0A=
Inviato: gioved=EC 23 aprile 2020 18:41=0A=
A: Bulgarella Fabio (Guest); Ian Swett; Cociglio Mauro=0A=
Cc: Riccardo Sisto; mailto:isabelle.hamchaoui@orange.com; mailto:quic@ietf.=
org; mailto:alexandre.ferrieux@orange.com; IETF IPPM WG (mailto:ippm@ietf.o=
rg)=0A=
Oggetto: [EXT] RE: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-=
spinbit-measurements)=0A=
=0A=
Fabio, thanks for the reply.=0A=
=0A=
=95 =93Moreover, with a strong amount of reordering the Qbit (and the SpinB=
it) would not work either.=94=0A=
=0A=
Strong reordering exists.  That=92s why we are recommending the minimum Q t=
o be 64.  This comes from real data, not lab data.  If 5 packets were enoug=
h to tell the end of marking periods, we would had recommended minimum Q to=
 be 8.=0A=
=0A=
=0A=
=95 R-bit signal delay.=0A=
=0A=
R signal is still going to be significantly delayed, especially with slower=
 connections (not every connection is going to be streaming media at a sust=
ained rate of 15Mbps).  So if for a 15Mbps average-rate connection you can =
expect to see R-signal with a delay between 8-RTTs (1:2 ACK) and 38-RTTs (1=
:10 ACK), the delay increases to 24-RTTs and 114-RTTs for a 5Mbps average-r=
ate connection.=0A=
=0A=
=95 R-bit signal quality.=0A=
=0A=
L-bit signal provides a crisp shape of the loss =96 whether it is random lo=
ss, or packets are lost of batches (and how many packets are in a loss batc=
h).  By contrast, R-signal only indicates an average loss over 2 to 10 Q-bi=
t marking periods.  The share of the loss is erased.=0A=
=0A=
I think for that alone, L-signal is more useful for troubleshooting.=0A=
=0A=
=0A=
=95 L-bit signal depends on each implementation=92s determination of when t=
o =93declare a packet lost=94 (which may differ for each implementation), w=
hile R-signal depends only on more generic behaviors.=0A=
=0A=
This is an important difference, and it seems accurate on its surface.  In =
reality, every QUIC implementation will keep track of packets and declare t=
hem lost for the purposes of data retransmission and/or congestion control.=
  The timing and details of when packets are declared lost (L-bit signal) w=
ill vary.  Likewise, every QUIC implementation will send some ACKs, but the=
ir timing and frequency (R-signal) will vary.  R-signal quality will also h=
eavily depend on the =93marking period detection=94 implementation quality =
and =93Q-signal averaging=94 implementation details.=0A=
=0A=
=0A=
=95 End-to-end loss: =93We can also place two independent observers whereve=
r on the two directions and they will still produce coherent E2E measures.=
=94=0A=
=95 End-to-end loss: =93by observing only one direction we can measure the =
[=85] the end-to-end in the opposite direction (Rbit).=0A=
=0A=
Correct, as long as both endpoints implement the entire QR scheme (even if =
this is an unusual setup =96 measuring path A requires observing path B).=
=0A=
=0A=
Also, accurate accounting with QR scheme requires correlation of both direc=
tions, with the R-bit direction significantly lagging the Q-bit direction. =
 It should be understood how this scheme behaves in cases of changing Conne=
ction IDs.=0A=
=0A=
Best wishes,=0A=
=0A=
=95 Igor=0A=
=0A=
=0A=
From: Bulgarella Fabio (Guest) <mailto:fabio.bulgarella=3D40guest.telecomit=
alia.it@dmarc.ietf.org>=0A=
Sent: Wednesday, April 22, 2020 3:12 PM=0A=
To: Lubashev, Igor <mailto:ilubashe@akamai.com>; Ian Swett <mailto:ianswett=
@google.com>; Cociglio Mauro <mailto:mauro.cociglio@telecomitalia.it>=0A=
Cc: Riccardo Sisto <mailto:riccardo.sisto@polito.it>; mailto:isabelle.hamch=
aoui@orange.com; mailto:quic@ietf.org; mailto:alexandre.ferrieux@orange.com=
; IETF IPPM WG (mailto:ippm@ietf.org) <mailto:ippm@ietf.org>=0A=
Subject: Re: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-spinbi=
t-measurements)=0A=
=0A=
Hello Igor,=0A=
here some thoughts about your concerns.=0A=
=0A=
1. If big differences in delay are present between two parallel paths on wh=
ich the same connection is divided, this is certainly an unwanted behavior,=
 because it could create problems to the protocol itself even before damagi=
ng the performance measurements. As a network operator, we try to avoid suc=
h scenarios. However, our mechanism works correctly in most cases and is st=
ill resistant to normal reordering. Moreover, with a strong amount of reord=
ering the Qbit (and the SpinBit) would not work either.=0A=
=0A=
=0A=
2. It's true that your mechanism allows the measurement of E2E and upstream=
 loss of the observed direction. However, these measurement methodologies a=
re born with the idea of providing information on the performance of the en=
tire connection, as was done with the SpinBit. Actually with our mechanism,=
 when observing a single direction, we still are able to measure the E2E lo=
ss of the opposite channel (using the R-bit).=0A=
=0A=
=0A=
3. The ACK ratio of 1:10 should only occur in the absence of loss. By intro=
ducing loss, the ratio between ACK and data is certainly better. So the qua=
lity of our signal improves just when it is needed; we don't care if we get=
 delayed measurements when everything is working great. This behavior is co=
nfirmed by our laboratory tests where we have seen that loss can be easily =
detected in an extremely accurate manner even in the case of highly unbalan=
ced flows.=0A=
=0A=
L-Bit has an RTO delay but to evaluate an accurate loss ratio you have stil=
l to observe a significant number of packets.=0A=
=0A=
=0A=
4. First of all, our solution is not dependent on any specific protocol imp=
lementation unlike the QL and therefore there shouldn=92t be problems relat=
ed to the quality of the implementation. In other words, our portion of cod=
e is always the same, in every protocol implementation.=0A=
Secondly, as anticipated in point 2, by observing only one direction we can=
 measure the losses in the operator's domain (Qbit) and the end-to-end in t=
he opposite direction (Rbit). So, our solution does work also for asymmetri=
c path segments. We can also place two indipendent observers wherever on th=
e two directions and they will still produce coherent E2E measures.=0A=
=0A=
The QL solution does not give any information about the opposite direction,=
 it only measures what it observes, that is the current direction. Having t=
wo independent measures, one per direction, can be an advantage in some asp=
ects, but a disadvantage for others.=0A=
=0A=
=0A=
Best regards,=0A=
Fabio B..=0A=
=0A=
=0A=
________________________________________=0A=
Da: ippm <mailto:ippm-bounces@ietf.org> per conto di Lubashev, Igor <mailto=
:ilubashe=3D40akamai.com@dmarc.ietf.org>=0A=
Inviato: marted=EC 21 aprile 2020 18:31=0A=
A: Ian Swett; Cociglio Mauro=0A=
Cc: Riccardo Sisto; mailto:isabelle.hamchaoui@orange.com; mailto:quic@ietf.=
org; mailto:alexandre.ferrieux@orange.com; IETF IPPM WG (mailto:ippm@ietf.o=
rg)=0A=
Oggetto: [EXT] Re: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-=
spinbit-measurements)=0A=
=0A=
I like the QR draft from the perspective that it mostly works (and lots of =
credit is due for things that work).=0A=
=0A=
I have a few concerns, though.=0A=
=0A=
1. The most trivial one is that QR is actually harder to implement correctl=
y for endpoints, given the tricky processing required to identify when a ma=
rking interval has ended.  Experimental data that Akamai & Orange compiled =
shows that there are networks that do ECMP among links with significantly d=
ifferent latencies.  They will cause a lot more reordering to a burst of pa=
ckets than the recommended =93observe 5 packets (in a row?) of the opposite=
 markings=94 rule can address.  You might need to potentially defer the dec=
ision on where exactly the marking period boundary is until you=92ve seen a=
lmost half of the next marking period.  Requiring every endpoint to impleme=
nt this right is tough.=0A=
=0A=
2. Since the most important direction (at least for downloads and media str=
eaming) is server-to-client, to get this signal with QR, you need both endp=
oints implementing the logic, with the heaviest lift on the clients (see ab=
ove).  For QL, a client that does not want to implement QL logic but is ok =
with the loss data reporting can just update the TP and header protection m=
ask =96 all the lift is on the server side.=0A=
=0A=
3. I am concerned with the quality of the signal you get from QR.  While th=
e upstream loss signal is strong (same Q-bit), the downstream/end-to-end lo=
ss signal is weak and is likely to result in very delayed and inconclusive =
signal.  Google=92s experience (as I understand it) and protocol research (=
https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__erg.abdn.ac.uk_-7Edo=
wnloads_ackscaling.pdf&d=3DDwMF-g&c=3D96ZbZZcaMF4w0F4jpN6LZg&r=3DDjn3bQ5uNJ=
DPM_2skfL3rW1tzcIxyjUZdn_m55KPmlo&m=3Du3hS0QnHLn0-P-Lmy8-Yhm7L0G310RjwTQfw2=
XLvfJk&s=3D8qb_Zcm3YASCVrMZiZ5Le_3_nPxd8AC7bUbVwXl4L9I&e=3D) point to the b=
enefit of ACK-ing only 1:10 packets after the initial slow start (draft-fai=
rhurst-quic-ack-scaling).  Since such behavior has a beneficial impact on n=
etworks, mobile devices, and endpoint cpu, and no negative impact on the pr=
otocol performance, I expect it to be in common use.  With 1:10 ACK ratio, =
R-bit signal is significantly delayed as it is lagging the loss by at least=
 1400*(Q=3D64)*2*10=3D1.8MB of data transferred, which is at least 38 RTTs =
for a 15Mbps stream over a 25ms link (L-bit signal is delayed by an RTO).=
=0A=
=0A=
4. QR scheme only works for symmetric path segments, when the observer can =
capture both directions of the flow. You also cannot compute end-to-end los=
s in any direction, unless both endpoints implement the entire QR algorithm=
.  In contrast, QL works for single-direction observers, and whichever endp=
oint implements QL algorithm ensures end-to-end loss signal for the packets=
 it sends, and the quality of that loss signal solely depends on the qualit=
y of that endpoint=92s implementation (not the quality of the other endpoin=
t=92s implementation).  QL seems more deployable.=0A=
=0A=
=95 Igor=0A=
=0A=
=0A=
From: Ian Swett <mailto:ianswett@google.com>=0A=
Sent: Wednesday, April 8, 2020 3:44 PM=0A=
To: Cociglio Mauro <mailto:mauro.cociglio=3D40telecomitalia.it@dmarc.ietf.o=
rg>=0A=
Cc: mailto:quic@ietf.org; Lubashev, Igor <mailto:ilubashe@akamai.com>; mail=
to:alexandre.ferrieux@orange.com; mailto:isabelle.hamchaoui@orange.com; Ric=
cardo Sisto <mailto:riccardo.sisto@polito.it>; IETF IPPM WG (mailto:ippm@ie=
tf.org) <mailto:ippm@ietf.org>=0A=
Subject: Re: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-spinbi=
t-measurements)=0A=
=0A=
Thanks for sharing this.  From my perspective, this is an improvement upon =
the previous proposal in terms of robustness.  This design feels very simil=
ar to the spin bit, and seems trivial to implement, which are also nice pro=
perties.=0A=
=0A=
Also, QUIC doesn't really have retransmissions, so the 'R bit' name always =
made me a bit uncomfortable.=0A=
=0A=
I'm not saying QUIC should adopt this yet, but I'd be interested in seeing =
a privacy analysis completed for it.=0A=
=0A=
Ian=0A=
=0A=
On Wed, Apr 8, 2020 at 4:25 AM Cociglio Mauro <mauro.cociglio=3Dmailto:40te=
lecomitalia.it@dmarc.ietf.org> wrote:=0A=
Dear QUIC WG Members.=0A=
=0A=
We submitted to IPPM WG a draft where we described a new 2 bit packet loss =
methodology (https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__tools.i=
etf.org_html_draft-2Dcfb-2Dippm-2Dspinbit-2Dmeasurements-2D01&d=3DDwMFaQ&c=
=3D96ZbZZcaMF4w0F4jpN6LZg&r=3DDjn3bQ5uNJDPM_2skfL3rW1tzcIxyjUZdn_m55KPmlo&m=
=3De_BQ3UDNSWkXu_ID1rkGv3CCZs89sezu-6Ibkvltf7Y&s=3DUeTW_fLvxHy_ewVvm0y6kIqZ=
oXUR8PYWgxAOxmQScYw&e=3D).=0A=
The measurement of packet loss is under discussion in QUIC WG and our draft=
 introduces two alternatives about it.=0A=
The first one is a spin-bit dependent signal and uses a single bit. The sec=
ond one, described in the following linked slides, is a standalone solution=
 based on a two bits loss signal and on alternate marking (RFC8321)..=0A=
This last methodology improves, in our opinion, the algorithm proposed by O=
range and Akamai described in https://urldefense.proofpoint.com/v2/url?u=3D=
https-3A__tools.ietf.org_html_draft-2Dferrieuxhamchaoui-2Dquic-2Dlossbits-2=
D03&d=3DDwMFaQ&c=3D96ZbZZcaMF4w0F4jpN6LZg&r=3DDjn3bQ5uNJDPM_2skfL3rW1tzcIxy=
jUZdn_m55KPmlo&m=3De_BQ3UDNSWkXu_ID1rkGv3CCZs89sezu-6Ibkvltf7Y&s=3DV649Uqu8=
mfuBWvMRBTUkpEWfpEqlLfufGs67XXzvNFo&e=3D.=0A=
=0A=
The 2 bits are the sQuare bit (Q-bit) and the Reflection square bit (R-bit)=
.=0A=
The Q-bit doesn=92t change from the Ferrieux-Hamchaoui draft but the R-bit =
substitutes the L-bit.=0A=
This avoids the L-bit dependence from an internal protocol variable, a prob=
lem raised in the last QUIC interim meeting.=0A=
=0A=
You can find the slides, we prepared for the IPPM interim meeting, at the f=
ollowing link: https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__githu=
b.com_ietf-2Dippm_meeting-2Dmaterials_blob_aa486f7ead28b9f55c5ef499e5c9ed33=
ab06daf9_ietf107-2Dvirtual_Slides_07-2Dspinbit-2Dmeasurements.pdf&d=3DDwMFa=
Q&c=3D96ZbZZcaMF4w0F4jpN6LZg&r=3DDjn3bQ5uNJDPM_2skfL3rW1tzcIxyjUZdn_m55KPml=
o&m=3De_BQ3UDNSWkXu_ID1rkGv3CCZs89sezu-6Ibkvltf7Y&s=3D3l6t3FYQn0iz_xX0sxNFK=
Unh7bwYFMOpQ0z_zNhXHpg&e=3D=0A=
=0A=
Comments and suggestions are always welcome.=0A=
=0A=
Of course we are available to present our proposals in the next QUIC WG mee=
ting or to arrange a Webex side meeting if needed.=0A=
=0A=
Best regards.=0A=
=0A=
Mauro, Fabio, Giuseppe, Massimo and Riccardo=0A=
=0A=
=0A=
_____________________=0A=
Mauro Cociglio=0A=
TIM - CT.TA.EI=0A=
Via G. Reiss Romoli, 274=0A=
10148 - Torino (Italy)=0A=
Tel.: tel:+39%20011%20228%205028=0A=
Mobile: tel:+39%20335%20766%209751=0A=
_____________________=0A=
=0A=
=0A=
https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__on.tim.it_banner-2Dm=
ail-2Ddip&d=3DDwMFaQ&c=3D96ZbZZcaMF4w0F4jpN6LZg&r=3DDjn3bQ5uNJDPM_2skfL3rW1=
tzcIxyjUZdn_m55KPmlo&m=3De_BQ3UDNSWkXu_ID1rkGv3CCZs89sezu-6Ibkvltf7Y&s=3Dz5=
5QpRg48UYrhUvomUNAlkMCUxdQT20Mz1VhZkNrLQI&e=3D=0A=
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ne immediata comunicazione al mittente e di provvedere alla sua distruzione=
, Grazie.=0A=
=0A=
This e-mail and any attachments is confidential and may contain privileged =
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From: Marcus Ihlar <marcus.ihlar@ericsson.com>
To: "fabio.bulgarella=40guest.telecomitalia.it@dmarc.ietf.org" <fabio.bulgarella=40guest.telecomitalia.it@dmarc.ietf.org>, "ilubashe=40akamai.com@dmarc.ietf.org" <ilubashe=40akamai.com@dmarc.ietf.org>, "ianswett@google.com" <ianswett@google.com>, "draft-cfb-ippm-spinbit-measurements@ietf.org" <draft-cfb-ippm-spinbit-measurements@ietf.org>
CC: "isabelle.hamchaoui@orange.com" <isabelle.hamchaoui@orange.com>, "quic@ietf.org" <quic@ietf.org>, "alexandre.ferrieux@orange.com" <alexandre.ferrieux@orange.com>, "ippm@ietf.org" <ippm@ietf.org>
Thread-Topic: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-spinbit-measurements)
Thread-Index: AdYNfRCPTsr9cJpyT2q4st79g+H+ngAYPt+AAocS/gAAN+A5AAAtC9yAAPWAoIACGMOCAAEKa1yAAABupWA=
Date: Thu, 14 May 2020 13:52:15 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ippm/_Pd1g6m27aUjvR0_nk4bWDbTkP4>
Subject: Re: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-spinbit-measurements)
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Hi,
I agree with the original problem that we need a good way to do packet loss=
 measurements for both aggregates and individual flows.
I'm not yet in a position to say which methodology is the most beneficial o=
ne from the set of cases I'm interested in (SLA assurance and troubleshooti=
ng mainly).

In Spindump we have support for both measurement methodologies and could qu=
ite easily extend it to observe loss using both methodologies simultaneousl=
y.
So I like the approach that Fabio is describing here, perhaps this could be=
 a good Hackathon project?

Marcus Ihlar

-----Original Message-----
From: QUIC <quic-bounces@ietf.org> On Behalf Of Bulgarella Fabio (Guest)
Sent: den 14 maj 2020 15:09
To: Lubashev, Igor <ilubashe=3D40akamai.com@dmarc.ietf.org>; Ian Swett <ian=
swett@google.com>; draft-cfb-ippm-spinbit-measurements@ietf.org
Cc: isabelle.hamchaoui@orange.com; quic@ietf.org; alexandre.ferrieux@orange=
.com; IETF IPPM WG (ippm@ietf.org) <ippm@ietf.org>
Subject: Re: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-spinbi=
t-measurements)

Hi Igor and all QUIC/IPPM WG members,

I think it's clear to everyone that both systems have advantages and disadv=
antages. In this email exchange, we both expressed our views on it.
At this point we would ask to WG members if they think it would be interest=
ing to see a comparative test between the two methodologies.

Our proposal is to implement both solutions on a common implementation of t=
he QUIC protocol so that the same data flow can be marked using both techni=
ques (i.e., Qbit, Rbit and Lbit - borrowing the third most significant bit =
occupied by the spinbit) and analyzed using the two observers.

Waiting for your feedbacks on this proposal, Best regards.

Fabio, Mauro, Massimo, Giuseppe and Riccardo


________________________________________
Da: Lubashev, Igor <ilubashe=3D40akamai.com@dmarc.ietf.org>
Inviato: sabato 9 maggio 2020 08:00
A: Bulgarella Fabio (Guest); Ian Swett; draft-cfb-ippm-spinbit-measurements=
@ietf.org
Cc: isabelle.hamchaoui@orange.com; quic@ietf.org; alexandre.ferrieux@orange=
..com; IETF IPPM WG (ippm@ietf.org)
Oggetto: [EXT] RE: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-=
spinbit-measurements)

Fabio,

I think we are in a complete agreement that any loss reporting is a very us=
eful extension - both for monitoring the network and for troubleshooting in=
dividual flows. I think we agree that L-bit and R-bit are better than nothi=
ng.  The disagreement is about the relative fitness for the purpose and eas=
e of deployability.

I would also welcome other people to weigh in with novel insights.  Maybe m=
ore people will catch up on both drafts before the next IETF.

I am happy to get into the details of each point (inline), but my biggest c=
oncern is aligned with Dmitri's concern that:

   (a) Simultaneous captures/observations by different organizations of inf=
requently occurring events is a futile proposition, and
   (b) A very large percentage of internet flows is asymmetric.

As a result, a method that relies of either of these properties is limiting=
 its utility for troubleshooting customer problems.

(The rest of the comments are inline)

> On Tue, April 28, 2020 at 9:51 AM, Bulgarella Fabio (Guest) <fabio.bulgar=
ella=3D40guest.telecomitalia.it@dmarc.ietf.org> wrote:
>
> Hello Igor,
> thanks for your reply.
>
> This exchange of e-mails is very useful to understand which of the two
> solutions has the best balance between positive and negative aspects,
> at least in the measurement scenarios of interest for telecommunication o=
perators. The important thing is that one of the two solution is chosen and=
 a packet loss feature is finally included in the Quic protocol (after the =
necessary checks in terms of privacy and security).
> However, we can already say, from the point of view of Telecom Italia and=
 Orange, that the Qbit is a fixed point of this type of measures.
> It remains to decide which is better between L-bit and R-bit.
>
> First of all, let's remember the reasons that led us to design the Rbit.
> We found some weaknesses in the Lbit:
>
> - the LBit logic is strictly tied to the protocol implementation.
> For example in LSQUIC there are 6 different hook points where this
> variable is set. QL performance mechanism logic is intertwined with
> the protocol logic. So, the concern here is that future changes in the
> protocol or in new implementations need a careful analysis of the code
> to avoid different behaviors and different measurement results;

The quality of the implementation of each stack is mostly related to the im=
plementor.  The behavior for both L-bit and R-bit is specified by the stand=
ards, so if the standards are implemented correctly, no analysis of the imp=
lementation should be needed.

> - loss of packets carrying only ACK frames (are detected?).
> We saw in the Montreal demo (using Ericsson SpinDump tool), the last July=
, that if Quic packets only contain ACK frames the Lbit is not set.
> Actually, during a file download we inserted losses in the upload directi=
on that were not detected by the system.
> Alexandre confirmed this behavior. Have you changed something since then?

With QL-bits, each endpoint is free to implement or NOT implement the marki=
ng.  The beauty of the QL scheme is that if an endpoint chooses to mark pac=
kets, those markings are sufficient to signal upstream and downstream loss =
of all packets sent by THAT endpoint. In the implementation you are referri=
ng to, it looks like the client endpoint did NOT choose to implement QL mar=
kings, so its packets (pure ACKs) did not provide loss signaling.  If the c=
lient did implement QL, those pure ACKs would report losses all the same.

> - the loss measurement signal is inaccurate in case of losses:
> The Lbit is a simple signaling protocol. If you miss a Lbit marked
> packet you miss a signal of loss. If losses are not equally
> distributed between L-marked and not L-marked packets, it's very
> likely that the produced measurements are wrong or at least inaccurate. T=
he two approaches are completely different. Rbit works exactly as the Qbit.=
 It counts the lost packets, it's not a signaling. So, as the Qbit, the cor=
rect percentage of lost packets is detected.

There is no difference between QL- and QR- schemes in regard to the signal =
quality in case a loss of packets with the signal. As you note, we discuss =
in the draft that it is conceivable for a somewhat different loss ratio for=
 packets w/ L=3D0 and L=3D1 for QL-bit scheme. Likewise, it is conceivable =
for a different loss ratio for packets belonging to "shorter" and "longer" =
R-trains for QR-bit scheme. After all, when there are losses to report (sho=
rter R trains), the ACKs will be sent more frequently, increasing the chanc=
e of the return path congestion.

> Now some inline answers to your considerations, even though at this
> point it would be convenient to organize a comparison involving also
> other people interested in the topic, maybe in a next IETF meeting. We
> are also available to carry out comparative tests on the same flows (mark=
ing simultaneously with both solutions) using for example the Ericsson Spin=
Dump tool which has already been used in the previous hackathons as QUIC pe=
rformance measurement tool.
>
>> Strong reordering exists.  That's why we are recommending the minimum Q =
to be 64. This comes from real data, not lab data.
>> If 5 packets were enough to tell the end of marking periods, we would ha=
d recommended minimum Q to be 8.
>
> The length of the period is not chosen only in function of reordering but=
 also to avoid that burst losses completely cancel one or more periods.

That's right, that is a factor also.  However, we have not observed losses =
that obliterate several dozens of consecutive packets, though I am sure the=
y exist somewhere.  Consistent packet reordering of that magnitude we did s=
ee.

> However, stimulated by Igor's concerns, we thought of an improvement rega=
rding the tolerance of our system against out of sequence.
> In a nutshell, it would be possible to intercept reordered packets
> received after the detection of an incoming "Qbit marking period", using =
them to update the computed average until the current "Rbit marking period"=
 is completed in generation.

Sure, though the receiver endpoint has access to the packet numbers and kno=
ws the loss rate exactly and can signal it directly.

> After the necessary laboratory tests, we could add this new feature to th=
e next revision of our draft.
>
> R signal is still going to be significantly delayed, especially with
> slower connections (not every connection is going to be streaming
> media at a sustained rate of 15Mbps). So if for a 15Mbps average-rate con=
nection you can expect to see R-signal with a delay between 8-RTTs (1:2 ACK=
) and 38-RTTs (1:10 ACK), the delay increases to 24-RTTs and 114-RTTs for a=
 5Mbps average-rate connection.
>
> As already said in the previous mail, based on our tests, this is not
> a big problem because it's still possible to obtain enough measurements t=
o evaluate the packet loss of a session. Moreover, the measurement delay is=
 shortened when packet loss occurs.

It depends.  For a large media download it is probably enough data for gene=
ric network monitoring.  It would not work for shorter flows.  Also, as I s=
howed above, even with an ack2 policy, you may get a 38-RTT delay for very =
realistic network media flows, which will make troubleshooting specific flo=
ws difficult.

>> L-bit signal provides a crisp shape of the loss - whether it is random l=
oss, or packets are lost of batches (and how many packets are in a loss bat=
ch).
> By contrast, R-signal only indicates an average loss over 2 to 10
> Q-bit marking periods.  The share of the loss is erased. I think for that=
 alone, L-signal is more useful for troubleshooting.
>
> Although we calculate the E2E loss through an average (only if the
> reflection is on a slower channel than the signal reception channel), we =
are still able to accurately calculate the loss using a correction factor (=
see https: //tools.ietf.org/html/draft-cfb-ippm-spinbit-measurements-00#sec=
tion-7.4).

I think you did not understand the concern here.  The specific shape of the=
 loss may be very useful for a network troubleshooting.  QL-signal allows o=
ne to observe the precise shape of the loss.  QR-scheme only gets you an av=
erage rate over multiple RTTs.

In fact, even if the loss is on the slower channel and reflection is on the=
 faster channel, QR only gets an average loss rate rather then the precise =
shape of the loss.

>> This is an important difference, and it seems accurate on its
>> surface.  In reality, every QUIC implementation will keep track of packe=
ts and declare them lost for the purposes of data retransmission and/or con=
gestion control.  The timing and details of when packets are declared lost =
(L-bit signal) will vary.
>> Likewise, every QUIC implementation will send some ACKs, but their
>> timing and frequency (R-signal) will vary.  R-signal quality will also h=
eavily depend on the "marking period detection" implementation quality and =
"Q-signal averaging" implementation details.
>
> See first point in the L-bit weeknesses paragraph. Moreover, the two
> functions "marking period detection" and "Q-signal averaging", really sim=
ple in implementation, are completely detached from the rest of the protoco=
l logic and their behaviors are expressly indicated in the draft.

There is no particular L-bit weakness here.  See my comment above - the pre=
cise timings of the signals will vary in both approaches.  The timing of L-=
bit will vary based on the sender's loss detection.  The timing of R-bit wi=
ll vary based on the receiver's ACK policy (and also the details of their "=
reordering mitigation" algorithms).

>> Also, accurate accounting with QR scheme requires correlation of both di=
rections, with the R-bit direction significantly lagging the Q-bit directio=
n.
>> It should be understood how this scheme behaves in cases of changing Con=
nection IDs.
>
> We do not see the problem of implementing the solution on both endpoints =
since generally the client, unlike the server, does not have scalability pr=
oblems.
> So if you implement it on the server it costs nothing to implement it on =
the client as well.

There is no scalability concern for the QL implementation at all.  It is ju=
st two counters that are incremented and decremented.

The real concern is developer skills and developer resources.  Servers typi=
cally have substantial development organizations that will get it right. Ex=
cept for a handful of most popular desktop and phone clients, however, clie=
nts have very limited developer support and update story. A lot of bits are=
 pushed by clients built into various streaming devices, smart TVs, set top=
 boxes, BluRay players, and some such.  Their implementations tend to be mi=
nimal and somewhat sloppy, and their upgrade path is sporadic at best.

Best regards,

- Igor

________________________________________
Da: Lubashev, Igor <mailto:ilubashe=3D40akamai.com@dmarc.ietf.org>
Inviato: gioved=EC 23 aprile 2020 18:41
A: Bulgarella Fabio (Guest); Ian Swett; Cociglio Mauro
Cc: Riccardo Sisto; mailto:isabelle.hamchaoui@orange.com; mailto:quic@ietf.=
org; mailto:alexandre.ferrieux@orange.com; IETF IPPM WG (mailto:ippm@ietf.o=
rg)
Oggetto: [EXT] RE: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-=
spinbit-measurements)

Fabio, thanks for the reply.

* "Moreover, with a strong amount of reordering the Qbit (and the SpinBit) =
would not work either."

Strong reordering exists.  That's why we are recommending the minimum Q to =
be 64.  This comes from real data, not lab data.  If 5 packets were enough =
to tell the end of marking periods, we would had recommended minimum Q to b=
e 8.


* R-bit signal delay.

R signal is still going to be significantly delayed, especially with slower=
 connections (not every connection is going to be streaming media at a sust=
ained rate of 15Mbps).  So if for a 15Mbps average-rate connection you can =
expect to see R-signal with a delay between 8-RTTs (1:2 ACK) and 38-RTTs (1=
:10 ACK), the delay increases to 24-RTTs and 114-RTTs for a 5Mbps average-r=
ate connection.

* R-bit signal quality.

L-bit signal provides a crisp shape of the loss - whether it is random loss=
, or packets are lost of batches (and how many packets are in a loss batch)=
.  By contrast, R-signal only indicates an average loss over 2 to 10 Q-bit =
marking periods.  The share of the loss is erased.

I think for that alone, L-signal is more useful for troubleshooting.


* L-bit signal depends on each implementation's determination of when to "d=
eclare a packet lost" (which may differ for each implementation), while R-s=
ignal depends only on more generic behaviors.

This is an important difference, and it seems accurate on its surface.  In =
reality, every QUIC implementation will keep track of packets and declare t=
hem lost for the purposes of data retransmission and/or congestion control.=
  The timing and details of when packets are declared lost (L-bit signal) w=
ill vary.  Likewise, every QUIC implementation will send some ACKs, but the=
ir timing and frequency (R-signal) will vary.  R-signal quality will also h=
eavily depend on the "marking period detection" implementation quality and =
"Q-signal averaging" implementation details.


* End-to-end loss: "We can also place two independent observers wherever on=
 the two directions and they will still produce coherent E2E measures."
* End-to-end loss: "by observing only one direction we can measure the [...=
] the end-to-end in the opposite direction (Rbit).

Correct, as long as both endpoints implement the entire QR scheme (even if =
this is an unusual setup - measuring path A requires observing path B).

Also, accurate accounting with QR scheme requires correlation of both direc=
tions, with the R-bit direction significantly lagging the Q-bit direction. =
 It should be understood how this scheme behaves in cases of changing Conne=
ction IDs.

Best wishes,

* Igor


From: Bulgarella Fabio (Guest) <mailto:fabio.bulgarella=3D40guest.telecomit=
alia.it@dmarc.ietf.org>
Sent: Wednesday, April 22, 2020 3:12 PM
To: Lubashev, Igor <mailto:ilubashe@akamai.com>; Ian Swett <mailto:ianswett=
@google.com>; Cociglio Mauro <mailto:mauro.cociglio@telecomitalia.it>
Cc: Riccardo Sisto <mailto:riccardo.sisto@polito.it>; mailto:isabelle.hamch=
aoui@orange.com; mailto:quic@ietf.org; mailto:alexandre.ferrieux@orange.com=
; IETF IPPM WG (mailto:ippm@ietf.org) <mailto:ippm@ietf.org>
Subject: Re: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-spinbi=
t-measurements)

Hello Igor,
here some thoughts about your concerns.

1. If big differences in delay are present between two parallel paths on wh=
ich the same connection is divided, this is certainly an unwanted behavior,=
 because it could create problems to the protocol itself even before damagi=
ng the performance measurements. As a network operator, we try to avoid suc=
h scenarios. However, our mechanism works correctly in most cases and is st=
ill resistant to normal reordering. Moreover, with a strong amount of reord=
ering the Qbit (and the SpinBit) would not work either.


2. It's true that your mechanism allows the measurement of E2E and upstream=
 loss of the observed direction. However, these measurement methodologies a=
re born with the idea of providing information on the performance of the en=
tire connection, as was done with the SpinBit. Actually with our mechanism,=
 when observing a single direction, we still are able to measure the E2E lo=
ss of the opposite channel (using the R-bit).


3. The ACK ratio of 1:10 should only occur in the absence of loss. By intro=
ducing loss, the ratio between ACK and data is certainly better. So the qua=
lity of our signal improves just when it is needed; we don't care if we get=
 delayed measurements when everything is working great. This behavior is co=
nfirmed by our laboratory tests where we have seen that loss can be easily =
detected in an extremely accurate manner even in the case of highly unbalan=
ced flows.

L-Bit has an RTO delay but to evaluate an accurate loss ratio you have stil=
l to observe a significant number of packets.


4. First of all, our solution is not dependent on any specific protocol imp=
lementation unlike the QL and therefore there shouldn't be problems related=
 to the quality of the implementation. In other words, our portion of code =
is always the same, in every protocol implementation.
Secondly, as anticipated in point 2, by observing only one direction we can=
 measure the losses in the operator's domain (Qbit) and the end-to-end in t=
he opposite direction (Rbit). So, our solution does work also for asymmetri=
c path segments. We can also place two indipendent observers wherever on th=
e two directions and they will still produce coherent E2E measures.

The QL solution does not give any information about the opposite direction,=
 it only measures what it observes, that is the current direction. Having t=
wo independent measures, one per direction, can be an advantage in some asp=
ects, but a disadvantage for others.


Best regards,
Fabio B..


________________________________________
Da: ippm <mailto:ippm-bounces@ietf.org> per conto di Lubashev, Igor <mailto=
:ilubashe=3D40akamai.com@dmarc.ietf.org>
Inviato: marted=EC 21 aprile 2020 18:31
A: Ian Swett; Cociglio Mauro
Cc: Riccardo Sisto; mailto:isabelle.hamchaoui@orange.com; mailto:quic@ietf.=
org; mailto:alexandre.ferrieux@orange.com; IETF IPPM WG (mailto:ippm@ietf.o=
rg)
Oggetto: [EXT] Re: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-=
spinbit-measurements)

I like the QR draft from the perspective that it mostly works (and lots of =
credit is due for things that work).

I have a few concerns, though.

1. The most trivial one is that QR is actually harder to implement correctl=
y for endpoints, given the tricky processing required to identify when a ma=
rking interval has ended.  Experimental data that Akamai & Orange compiled =
shows that there are networks that do ECMP among links with significantly d=
ifferent latencies.  They will cause a lot more reordering to a burst of pa=
ckets than the recommended "observe 5 packets (in a row?) of the opposite m=
arkings" rule can address.  You might need to potentially defer the decisio=
n on where exactly the marking period boundary is until you've seen almost =
half of the next marking period.  Requiring every endpoint to implement thi=
s right is tough.

2. Since the most important direction (at least for downloads and media str=
eaming) is server-to-client, to get this signal with QR, you need both endp=
oints implementing the logic, with the heaviest lift on the clients (see ab=
ove).  For QL, a client that does not want to implement QL logic but is ok =
with the loss data reporting can just update the TP and header protection m=
ask - all the lift is on the server side.

3. I am concerned with the quality of the signal you get from QR.  While th=
e upstream loss signal is strong (same Q-bit), the downstream/end-to-end lo=
ss signal is weak and is likely to result in very delayed and inconclusive =
signal.  Google's experience (as I understand it) and protocol research (ht=
tps://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__erg.abdn.ac.uk_-7Edown=
loads_ackscaling.pdf&d=3DDwMF-g&c=3D96ZbZZcaMF4w0F4jpN6LZg&r=3DDjn3bQ5uNJDP=
M_2skfL3rW1tzcIxyjUZdn_m55KPmlo&m=3Du3hS0QnHLn0-P-Lmy8-Yhm7L0G310RjwTQfw2XL=
vfJk&s=3D8qb_Zcm3YASCVrMZiZ5Le_3_nPxd8AC7bUbVwXl4L9I&e=3D) point to the ben=
efit of ACK-ing only 1:10 packets after the initial slow start (draft-fairh=
urst-quic-ack-scaling).  Since such behavior has a beneficial impact on net=
works, mobile devices, and endpoint cpu, and no negative impact on the prot=
ocol performance, I expect it to be in common use.  With 1:10 ACK ratio, R-=
bit signal is significantly delayed as it is lagging the loss by at least 1=
400*(Q=3D64)*2*10=3D1.8MB of data transferred, which is at least 38 RTTs fo=
r a 15Mbps stream over a 25ms link (L-bit signal is delayed by an RTO).

4. QR scheme only works for symmetric path segments, when the observer can =
capture both directions of the flow. You also cannot compute end-to-end los=
s in any direction, unless both endpoints implement the entire QR algorithm=
..  In contrast, QL works for single-direction observers, and whichever end=
point implements QL algorithm ensures end-to-end loss signal for the packet=
s it sends, and the quality of that loss signal solely depends on the quali=
ty of that endpoint's implementation (not the quality of the other endpoint=
's implementation).  QL seems more deployable.

* Igor


From: Ian Swett <mailto:ianswett@google.com>
Sent: Wednesday, April 8, 2020 3:44 PM
To: Cociglio Mauro <mailto:mauro.cociglio=3D40telecomitalia.it@dmarc.ietf.o=
rg>
Cc: mailto:quic@ietf.org; Lubashev, Igor <mailto:ilubashe@akamai.com>; mail=
to:alexandre.ferrieux@orange.com; mailto:isabelle.hamchaoui@orange.com; Ric=
cardo Sisto <mailto:riccardo.sisto@polito.it>; IETF IPPM WG (mailto:ippm@ie=
tf.org) <mailto:ippm@ietf.org>
Subject: Re: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-spinbi=
t-measurements)

Thanks for sharing this.  From my perspective, this is an improvement upon =
the previous proposal in terms of robustness.  This design feels very simil=
ar to the spin bit, and seems trivial to implement, which are also nice pro=
perties.

Also, QUIC doesn't really have retransmissions, so the 'R bit' name always =
made me a bit uncomfortable.

I'm not saying QUIC should adopt this yet, but I'd be interested in seeing =
a privacy analysis completed for it.

Ian

On Wed, Apr 8, 2020 at 4:25 AM Cociglio Mauro <mauro.cociglio=3Dmailto:40te=
lecomitalia.it@dmarc.ietf.org> wrote:
Dear QUIC WG Members.

We submitted to IPPM WG a draft where we described a new 2 bit packet loss =
methodology (https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__tools.i=
etf.org_html_draft-2Dcfb-2Dippm-2Dspinbit-2Dmeasurements-2D01&d=3DDwMFaQ&c=
=3D96ZbZZcaMF4w0F4jpN6LZg&r=3DDjn3bQ5uNJDPM_2skfL3rW1tzcIxyjUZdn_m55KPmlo&m=
=3De_BQ3UDNSWkXu_ID1rkGv3CCZs89sezu-6Ibkvltf7Y&s=3DUeTW_fLvxHy_ewVvm0y6kIqZ=
oXUR8PYWgxAOxmQScYw&e=3D).
The measurement of packet loss is under discussion in QUIC WG and our draft=
 introduces two alternatives about it.
The first one is a spin-bit dependent signal and uses a single bit. The sec=
ond one, described in the following linked slides, is a standalone solution=
 based on a two bits loss signal and on alternate marking (RFC8321)..
This last methodology improves, in our opinion, the algorithm proposed by O=
range and Akamai described in https://urldefense.proofpoint.com/v2/url?u=3D=
https-3A__tools.ietf.org_html_draft-2Dferrieuxhamchaoui-2Dquic-2Dlossbits-2=
D03&d=3DDwMFaQ&c=3D96ZbZZcaMF4w0F4jpN6LZg&r=3DDjn3bQ5uNJDPM_2skfL3rW1tzcIxy=
jUZdn_m55KPmlo&m=3De_BQ3UDNSWkXu_ID1rkGv3CCZs89sezu-6Ibkvltf7Y&s=3DV649Uqu8=
mfuBWvMRBTUkpEWfpEqlLfufGs67XXzvNFo&e=3D.

The 2 bits are the sQuare bit (Q-bit) and the Reflection square bit (R-bit)=
..
The Q-bit doesn't change from the Ferrieux-Hamchaoui draft but the R-bit su=
bstitutes the L-bit.
This avoids the L-bit dependence from an internal protocol variable, a prob=
lem raised in the last QUIC interim meeting.

You can find the slides, we prepared for the IPPM interim meeting, at the f=
ollowing link: https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__githu=
b.com_ietf-2Dippm_meeting-2Dmaterials_blob_aa486f7ead28b9f55c5ef499e5c9ed33=
ab06daf9_ietf107-2Dvirtual_Slides_07-2Dspinbit-2Dmeasurements.pdf&d=3DDwMFa=
Q&c=3D96ZbZZcaMF4w0F4jpN6LZg&r=3DDjn3bQ5uNJDPM_2skfL3rW1tzcIxyjUZdn_m55KPml=
o&m=3De_BQ3UDNSWkXu_ID1rkGv3CCZs89sezu-6Ibkvltf7Y&s=3D3l6t3FYQn0iz_xX0sxNFK=
Unh7bwYFMOpQ0z_zNhXHpg&e=3D

Comments and suggestions are always welcome.

Of course we are available to present our proposals in the next QUIC WG mee=
ting or to arrange a Webex side meeting if needed.

Best regards.

Mauro, Fabio, Giuseppe, Massimo and Riccardo


_____________________
Mauro Cociglio
TIM - CT.TA.EI
Via G. Reiss Romoli, 274
10148 - Torino (Italy)
Tel.: tel:+39%20011%20228%205028
Mobile: tel:+39%20335%20766%209751
_____________________


https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__on.tim.it_banner-2Dm=
ail-2Ddip&d=3DDwMFaQ&c=3D96ZbZZcaMF4w0F4jpN6LZg&r=3DDjn3bQ5uNJDPM_2skfL3rW1=
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Questo messaggio e i suoi allegati sono indirizzati esclusivamente alle per=
sone indicate. La diffusione, copia o qualsiasi altra azione derivante dall=
a conoscenza di queste informazioni sono rigorosamente vietate. Qualora abb=
iate ricevuto questo documento per errore siete cortesemente pregati di dar=
ne immediata comunicazione al mittente e di provvedere alla sua distruzione=
, Grazie.

This e-mail and any attachments is confidential and may contain privileged =
information intended for the addressee(s) only. Dissemination, copying, pri=
nting or use by anybody else is unauthorised. If you are not the intended r=
ecipient, please delete this message and any attachments and advise the sen=
der by return e-mail, Thanks...

Rispetta l'ambiente. Non stampare questa mail se non =E8 necessario.
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Subject: [ippm] Second WGLC for draft-ietf-ippm-ioam-data
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Hi IPPM,

At our virtual interim meeting, we decided to put =
draft-ietf-ippm-ioam-data through a second last call, based on the new =
revisions, in mid-May. This email starts a two-week WGLC for this draft.

The latest version can be found here: =
https://tools.ietf.org/html/draft-ietf-ippm-ioam-data-09

This last call will end on Thursday, May 28. Please reply to =
ippm@ietf.org with your reviews and comments.

Thanks,
Tommy & Ian=

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charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">Hi =
IPPM,<div class=3D""><br class=3D""></div><div class=3D"">At our virtual =
interim meeting, we decided to put&nbsp;draft-ietf-ippm-ioam-data =
through a second last call, based on the new revisions, in mid-May. This =
email starts a two-week WGLC for this draft.</div><div class=3D""><br =
class=3D""></div><div class=3D"">The latest version can be found =
here:&nbsp;<a =
href=3D"https://tools.ietf.org/html/draft-ietf-ippm-ioam-data-09" =
class=3D"">https://tools.ietf.org/html/draft-ietf-ippm-ioam-data-09</a></d=
iv><div class=3D""><br class=3D""></div><div class=3D"">This last call =
will end on <b class=3D"">Thursday, May 28</b>. Please reply to <a =
href=3D"mailto:ippm@ietf.org" class=3D"">ippm@ietf.org</a> with your =
reviews and comments.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Thanks,</div><div class=3D"">Tommy &amp; =
Ian</div></body></html>=

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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Tue, 19 May 2020 08:50:10 -0700
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To: IPPM Chairs <ippm-chairs@ietf.org>, IETF IPPM WG <ippm@ietf.org>
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Subject: [ippm] Next step for STAMP Extensions
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--000000000000b18d3405a6023cf6
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Dear Tommy and Ian,
during the presentation of recent updates to the STAMP Extensions draft (
draft-ietf-ippm-stamp-option-tlv
<https://datatracker.ietf.org/doc/draft-ietf-ippm-stamp-option-tlv/>) at
the IPPM WG interim meeting, I had mentioned that the authors believe that
the document is ready for the WG LC. In the view of the authors, the
document has been stable and defines a set of useful extensions to STAMP.
We much appreciate your consideration of starting the WG LC on the
draft-ietf-ippm-stamp-option-tlv.

Best regards,
Greg

--000000000000b18d3405a6023cf6
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<div dir=3D"ltr">Dear Tommy and Ian,<div>during the presentation of recent =
updates to the STAMP Extensions draft (<a href=3D"https://datatracker.ietf.=
org/doc/draft-ietf-ippm-stamp-option-tlv/">draft-ietf-ippm-stamp-option-tlv=
</a>) at the IPPM WG interim meeting, I had mentioned that the authors beli=
eve that the document is ready for the WG LC. In the view of the authors, t=
he document has been stable and defines a set of useful extensions to STAMP=
. We much appreciate your consideration of starting the WG LC on the draft-=
ietf-ippm-stamp-option-tlv.</div><div><br></div><div>Best regards,</div><di=
v>Greg</div></div>

--000000000000b18d3405a6023cf6--


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Subject: [ippm] ippm - New Meeting Session Request for IETF 108
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A new meeting session request has just been submitted by Tommy Pauly, a Chair of the ippm working group.


---------------------------------------------------------
Working Group Name: IP Performance Measurement
Area Name: Transport Area
Session Requester: Tommy Pauly


Number of Sessions: 1
Length of Session(s):  100 Minutes
Number of Attendees: 40
Conflicts to Avoid: 
 Chair Conflict:  quic httpbis taps capport
 Technology Overlap:  tcpm 6man spring
 Key Participant Conflict:  bmwg





People who must be present:
  Alfred Channon Morton
  Martin Duke
  Frank Brockners
  Greg Mirsky
  Tommy Pauly
  Ian Swett

Resources Requested:

Special Requests:
  
---------------------------------------------------------



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Hi IPPM,

At our virtual interim meeting, we decided draft-ietf-ippm-stamp-option-tlv
was ready for last call. This email starts a two-week WGLC for this draft.

The latest version can be found here:
https://tools.ietf.org/html/draft-ietf-ippm-stamp-option-tlv-04

This last call will end on *Monday, June 8th*. Please reply to ippm@ietf.org
with your reviews and comments.

Thanks,
Ian & Tommy

--000000000000f6296605a6434706
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<div dir=3D"ltr">Hi IPPM,<br><br>At our virtual interim meeting, we decided=
 draft-ietf-ippm-stamp-option-tlv was ready for last call. This email start=
s a two-week WGLC for this draft.<br><br>The latest version can be found he=
re: <a href=3D"https://tools.ietf.org/html/draft-ietf-ippm-stamp-option-tlv=
-04">https://tools.ietf.org/html/draft-ietf-ippm-stamp-option-tlv-04</a><br=
><br>This last call will end on <b>Monday, June 8th</b>. Please reply to <a=
 href=3D"mailto:ippm@ietf.org">ippm@ietf.org</a> with your reviews and comm=
ents.<br><br>Thanks,<br>Ian &amp; Tommy</div>

--000000000000f6296605a6434706--


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Subject: Re: [ippm] WGLC for STAMP Extensions
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Hi IPPM,

As part of the WGLC, we also need to assign a document shepherd. If you =
are interested in helping out by shepherding this document, please email =
the chairs!

Also, if you are aware of any IPR on this document, please report and =
let the list know.

Best,
Tommy & Ian

> On May 22, 2020, at 2:26 PM, Ian Swett =
<ianswett=3D40google.com@dmarc.ietf.org> wrote:
>=20
> Hi IPPM,
>=20
> At our virtual interim meeting, we decided =
draft-ietf-ippm-stamp-option-tlv was ready for last call. This email =
starts a two-week WGLC for this draft.
>=20
> The latest version can be found here: =
https://tools.ietf.org/html/draft-ietf-ippm-stamp-option-tlv-04 =
<https://tools.ietf.org/html/draft-ietf-ippm-stamp-option-tlv-04>
>=20
> This last call will end on Monday, June 8th. Please reply to =
ippm@ietf.org <mailto:ippm@ietf.org> with your reviews and comments.
>=20
> Thanks,
> Ian & Tommy
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm


--Apple-Mail=_883EDF2E-456E-4251-8EB4-360A29BB44C7
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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"">Hi =
IPPM,<div class=3D""><br class=3D""></div><div class=3D"">As part of the =
WGLC, we also need to assign a document shepherd. If you are interested =
in helping out by shepherding this document, please email the =
chairs!</div><div class=3D""><br class=3D""></div><div class=3D"">Also, =
if you are aware of any IPR on this document, please report and let the =
list know.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Best,</div><div class=3D"">Tommy &amp; Ian<br =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On May 22, 2020, at 2:26 PM, Ian Swett &lt;<a =
href=3D"mailto:ianswett=3D40google.com@dmarc.ietf.org" =
class=3D"">ianswett=3D40google.com@dmarc.ietf.org</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
dir=3D"ltr" class=3D"">Hi IPPM,<br class=3D""><br class=3D"">At our =
virtual interim meeting, we decided draft-ietf-ippm-stamp-option-tlv was =
ready for last call. This email starts a two-week WGLC for this =
draft.<br class=3D""><br class=3D"">The latest version can be found =
here: <a =
href=3D"https://tools.ietf.org/html/draft-ietf-ippm-stamp-option-tlv-04" =
class=3D"">https://tools.ietf.org/html/draft-ietf-ippm-stamp-option-tlv-04=
</a><br class=3D""><br class=3D"">This last call will end on <b =
class=3D"">Monday, June 8th</b>. Please reply to <a =
href=3D"mailto:ippm@ietf.org" class=3D"">ippm@ietf.org</a> with your =
reviews and comments.<br class=3D""><br class=3D"">Thanks,<br =
class=3D"">Ian &amp; Tommy</div>
_______________________________________________<br class=3D"">ippm =
mailing list<br class=3D""><a href=3D"mailto:ippm@ietf.org" =
class=3D"">ippm@ietf.org</a><br =
class=3D"">https://www.ietf.org/mailman/listinfo/ippm<br =
class=3D""></div></blockquote></div><br class=3D""></div></body></html>=

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Cc: adi masputra <adi@apple.com>, "IETF IPPM WG (ippm@ietf.org)" <ippm@ietf.org>
To: Tommy Pauly <tpauly=40apple.com@dmarc.ietf.org>, Ian Swett <ianswett=40google.com@dmarc.ietf.org>
References: <CAKcm_gMVc88xpkOMmV7L-ybVCBzw+LhNS6Jw3=iB2gutR0ZhxA@mail.gmail.com> <4824E037-2612-4495-973C-3D5E5A642716@apple.com>
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Subject: Re: [ippm] WGLC for STAMP Extensions
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Hi Tommy & Ian,

I=E2=80=99m not aware of any IPR from my side.

Thanks,
Adi

> On May 22, 2020, at 15:55, Tommy Pauly =
<tpauly=3D40apple.com@dmarc.ietf.org> wrote:
>=20
> Hi IPPM,
>=20
> As part of the WGLC, we also need to assign a document shepherd. If =
you are interested in helping out by shepherding this document, please =
email the chairs!
>=20
> Also, if you are aware of any IPR on this document, please report and =
let the list know.
>=20
> Best,
> Tommy & Ian
>=20
>> On May 22, 2020, at 2:26 PM, Ian Swett =
<ianswett=3D40google.com@dmarc.ietf.org =
<mailto:ianswett=3D40google.com@dmarc.ietf.org>> wrote:
>>=20
>> Hi IPPM,
>>=20
>> At our virtual interim meeting, we decided =
draft-ietf-ippm-stamp-option-tlv was ready for last call. This email =
starts a two-week WGLC for this draft.
>>=20
>> The latest version can be found here: =
https://tools.ietf.org/html/draft-ietf-ippm-stamp-option-tlv-04 =
<https://tools.ietf.org/html/draft-ietf-ippm-stamp-option-tlv-04>
>>=20
>> This last call will end on Monday, June 8th. Please reply to =
ippm@ietf.org <mailto:ippm@ietf.org> with your reviews and comments.
>>=20
>> Thanks,
>> Ian & Tommy
>> _______________________________________________
>> ippm mailing list
>> ippm@ietf.org <mailto:ippm@ietf.org>
>> https://www.ietf.org/mailman/listinfo/ippm
>=20
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">Hi =
Tommy &amp; Ian,<div class=3D""><br class=3D""></div><div class=3D"">I=E2=80=
=99m not aware of any IPR from my side.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Thanks,</div><div class=3D"">Adi<br =
class=3D""><div class=3D""><div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D"">On May 22, 2020, at 15:55, Tommy Pauly &lt;<a =
href=3D"mailto:tpauly=3D40apple.com@dmarc.ietf.org" =
class=3D"">tpauly=3D40apple.com@dmarc.ietf.org</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><meta =
http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii" =
class=3D""><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: =
space; line-break: after-white-space;" class=3D"">Hi IPPM,<div =
class=3D""><br class=3D""></div><div class=3D"">As part of the WGLC, we =
also need to assign a document shepherd. If you are interested in =
helping out by shepherding this document, please email the =
chairs!</div><div class=3D""><br class=3D""></div><div class=3D"">Also, =
if you are aware of any IPR on this document, please report and let the =
list know.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Best,</div><div class=3D"">Tommy &amp; Ian<br class=3D""><div =
class=3D""><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On May 22, 2020, at 2:26 PM, Ian Swett &lt;<a =
href=3D"mailto:ianswett=3D40google.com@dmarc.ietf.org" =
class=3D"">ianswett=3D40google.com@dmarc.ietf.org</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
dir=3D"ltr" class=3D"">Hi IPPM,<br class=3D""><br class=3D"">At our =
virtual interim meeting, we decided draft-ietf-ippm-stamp-option-tlv was =
ready for last call. This email starts a two-week WGLC for this =
draft.<br class=3D""><br class=3D"">The latest version can be found =
here: <a =
href=3D"https://tools.ietf.org/html/draft-ietf-ippm-stamp-option-tlv-04" =
class=3D"">https://tools.ietf.org/html/draft-ietf-ippm-stamp-option-tlv-04=
</a><br class=3D""><br class=3D"">This last call will end on <b =
class=3D"">Monday, June 8th</b>. Please reply to <a =
href=3D"mailto:ippm@ietf.org" class=3D"">ippm@ietf.org</a> with your =
reviews and comments.<br class=3D""><br class=3D"">Thanks,<br =
class=3D"">Ian &amp; Tommy</div>
_______________________________________________<br class=3D"">ippm =
mailing list<br class=3D""><a href=3D"mailto:ippm@ietf.org" =
class=3D"">ippm@ietf.org</a><br class=3D""><a =
href=3D"https://www.ietf.org/mailman/listinfo/ippm" =
class=3D"">https://www.ietf.org/mailman/listinfo/ippm</a><br =
class=3D""></div></blockquote></div><br =
class=3D""></div></div>_______________________________________________<br =
class=3D"">ippm mailing list<br class=3D""><a =
href=3D"mailto:ippm@ietf.org" class=3D"">ippm@ietf.org</a><br =
class=3D"">https://www.ietf.org/mailman/listinfo/ippm<br =
class=3D""></div></blockquote></div><br =
class=3D""></div></div></body></html>=

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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Fri, 22 May 2020 18:03:41 -0700
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To: Ian Swett <ianswett=40google.com@dmarc.ietf.org>
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Subject: Re: [ippm] WGLC for STAMP Extensions
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Dear All,
I support (as a co-author) the publication of this draft. Extensions
specified in the document are important and address a number of practical
use cases of STAMP deployment.

Also, I'm not aware of any IPR related to this draft.

Regards,
Greg

On Fri, May 22, 2020 at 2:26 PM Ian Swett <ianswett=
40google.com@dmarc.ietf.org> wrote:

> Hi IPPM,
>
> At our virtual interim meeting, we decided
> draft-ietf-ippm-stamp-option-tlv was ready for last call. This email starts
> a two-week WGLC for this draft.
>
> The latest version can be found here:
> https://tools.ietf.org/html/draft-ietf-ippm-stamp-option-tlv-04
>
> This last call will end on *Monday, June 8th*. Please reply to
> ippm@ietf.org with your reviews and comments.
>
> Thanks,
> Ian & Tommy
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm
>

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<div dir=3D"ltr">Dear All,<div>I support (as a co-author) the publication o=
f this draft. Extensions specified in the document are important and addres=
s a number of practical use cases of STAMP deployment.</div><div><br></div>=
<div>Also, I&#39;m not aware of any IPR related to this draft.</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 Fri, May 22, 2020 at 2:26 PM I=
an Swett &lt;ianswett=3D<a href=3D"mailto:40google.com@dmarc.ietf.org">40go=
ogle.com@dmarc.ietf.org</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 dir=3D"ltr">Hi IPPM,<br><br>At our virtual inte=
rim meeting, we decided draft-ietf-ippm-stamp-option-tlv was ready for last=
 call. This email starts a two-week WGLC for this draft.<br><br>The latest =
version can be found here: <a href=3D"https://tools.ietf.org/html/draft-iet=
f-ippm-stamp-option-tlv-04" target=3D"_blank">https://tools.ietf.org/html/d=
raft-ietf-ippm-stamp-option-tlv-04</a><br><br>This last call will end on <b=
>Monday, June 8th</b>. Please reply to <a href=3D"mailto:ippm@ietf.org" tar=
get=3D"_blank">ippm@ietf.org</a> with your reviews and comments.<br><br>Tha=
nks,<br>Ian &amp; Tommy</div>
_______________________________________________<br>
ippm mailing list<br>
<a href=3D"mailto:ippm@ietf.org" target=3D"_blank">ippm@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/ippm" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/ippm</a><br>
</blockquote></div>

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From: Tianran Zhou <zhoutianran@huawei.com>
To: Ian Swett <ianswett=40google.com@dmarc.ietf.org>
CC: IETF IPPM WG <ippm@ietf.org>
Thread-Topic: [ippm] WGLC for STAMP Extensions
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lor:#333333">
<span style=3D"color:#333333; font-size:17.0px">Hi&nbsp;WG,</span><br>
<br>
<span style=3D"color:#333333; font-size:17.0px">I&nbsp;support&nbsp;the&nbs=
p;publication&nbsp;of&nbsp;this&nbsp;draft.</span><br>
<br>
<span style=3D"color:#333333; font-size:17.0px">Cheers,</span><br>
<span style=3D"color:#333333; font-size:17.0px">Tianran&nbsp;</span><br>
<br>
<br>
<br>
<br>
<span style=3D"color:#333333; font-size:17.0px">
<hr id=3D"client_signature_separator" style=3D"border-top:dotted 1px">
</span><br>
<span style=3D"color:#333333; font-size:17.0px">Sent&nbsp;from&nbsp;WeLink<=
/span><br>
</div>
<div name=3D"AnyOffice-Background-Image" style=3D"border-top:1px solid #B5C=
4DF; padding:8px">
<div><b>=B7=A2=BC=FE=C8=CB=A3=BA </b>Ian Swett&lt;<a href=3D"mailto:ianswet=
t=3D40google.com@dmarc.ietf.org">ianswett=3D40google.com@dmarc.ietf.org</a>=
&gt;</div>
<div><b>=CA=D5=BC=FE=C8=CB=A3=BA </b>IETF IPPM WG (ippm&lt;<a href=3D"mailt=
o:ippm@ietf.org">ippm@ietf.org</a>&gt;</div>
<div><b>=D6=F7=CC=E2=A3=BA </b>[ippm] WGLC for STAMP Extensions</div>
<div><b>=CA=B1=BC=E4=A3=BA </b>2020-05-23 05:26:53</div>
<br>
</div>
<div>
<div dir=3D"ltr">Hi IPPM,<br>
<br>
At our virtual interim meeting, we decided draft-ietf-ippm-stamp-option-tlv=
 was ready for last call. This email starts a two-week WGLC for this draft.=
<br>
<br>
The latest version can be found here: <a href=3D"https://tools.ietf.org/htm=
l/draft-ietf-ippm-stamp-option-tlv-04">
https://tools.ietf.org/html/draft-ietf-ippm-stamp-option-tlv-04</a><br>
<br>
This last call will end on <b>Monday, June 8th</b>. Please reply to <a href=
=3D"mailto:ippm@ietf.org">
ippm@ietf.org</a> with your reviews and comments.<br>
<br>
Thanks,<br>
Ian &amp; Tommy</div>
</div>
</body>
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From: Giuseppe Fioccola <giuseppe.fioccola@huawei.com>
To: Ian Swett <ianswett=40google.com@dmarc.ietf.org>, "IETF IPPM WG (ippm@ietf.org)" <ippm@ietf.org>
Thread-Topic: [ippm] WGLC for STAMP Extensions
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From: wangyali <wangyali11@huawei.com>
To: "ippm@ietf.org" <ippm@ietf.org>
Thread-Topic: Questions about draft-xiao-ippm-ioam-conf-state
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Date: Sun, 24 May 2020 11:49:35 +0000
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Subject: [ippm] Questions about draft-xiao-ippm-ioam-conf-state
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Hi authors,

This is Yali. This is an interesting work. I have following two questions.

First, is the list of Namespace-IDs the subset or all of Namespaces which t=
he IOAM encapsulating node belongs to? If it is, I suggest adding some word=
s to illustrate this.

Second, could this extension to the echo request/reply mechanisms also be u=
sed in ICMP defined for IPv4?

In my opinion, as the Information Request and Reply Type=3D15 and Type=3D16=
 have been obsolete [RFC6918], so it could be used as the IOAM Capability e=
cho request/reply messages to acquire the enabled IOAM capabilities.

Thanks,
Yali


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<p class=3D"MsoNormal">Hi authors,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This is Yali. This is an interesting work. I have fo=
llowing two questions.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">First, is the list of Namespace-IDs the subset or al=
l of Namespaces which the IOAM encapsulating node belongs to? If it is, I s=
uggest adding some words to illustrate this.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Second, could this extension to the echo request/rep=
ly mechanisms also be used in ICMP defined for IPv4?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In my opinion, as the Information Request and Reply =
Type=3D15 and Type=3D16 have been obsolete [RFC6918], so it could be used a=
s the IOAM Capability echo request/reply messages to acquire the enabled IO=
AM capabilities.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
<p class=3D"MsoNormal">Yali<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</body>
</html>

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From: Henrik Nydell <hnydell@accedian.com>
Date: Mon, 25 May 2020 07:46:57 +0200
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To: Tommy Pauly <tpauly=40apple.com@dmarc.ietf.org>
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As co-author I support the publication, and am not aware of any IPR related
to this document.

Cheers
Henrik

On Sat, 23 May 2020, 00:55 Tommy Pauly, <tpauly=3D40apple.com@dmarc.ietf.or=
g>
wrote:

> Hi IPPM,
>
> As part of the WGLC, we also need to assign a document shepherd. If you
> are interested in helping out by shepherding this document, please email
> the chairs!
>
> Also, if you are aware of any IPR on this document, please report and let
> the list know.
>
> Best,
> Tommy & Ian
>
> On May 22, 2020, at 2:26 PM, Ian Swett <
> ianswett=3D40google.com@dmarc.ietf.org> wrote:
>
> Hi IPPM,
>
> At our virtual interim meeting, we decided
> draft-ietf-ippm-stamp-option-tlv was ready for last call. This email star=
ts
> a two-week WGLC for this draft.
>
> The latest version can be found here:
> https://tools.ietf.org/html/draft-ietf-ippm-stamp-option-tlv-04
>
> This last call will end on *Monday, June 8th*. Please reply to
> ippm@ietf.org with your reviews and comments.
>
> Thanks,
> Ian & Tommy
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm
>
>
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm
>

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<div dir=3D"auto">As co-author I support the publication, and am not aware =
of any IPR related to this document.<div dir=3D"auto"><br></div><div dir=3D=
"auto">Cheers</div><div dir=3D"auto">Henrik=C2=A0</div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sat, 23 May 2020,=
 00:55 Tommy Pauly, &lt;tpauly=3D<a href=3D"mailto:40apple.com@dmarc.ietf.o=
rg">40apple.com@dmarc.ietf.org</a>&gt; wrote:<br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding=
-left:1ex"><div style=3D"word-wrap:break-word;line-break:after-white-space"=
>Hi IPPM,<div><br></div><div>As part of the WGLC, we also need to assign a =
document shepherd. If you are interested in helping out by shepherding this=
 document, please email the chairs!</div><div><br></div><div>Also, if you a=
re aware of any IPR on this document, please report and let the list know.<=
/div><div><br></div><div>Best,</div><div>Tommy &amp; Ian<br><div><br><block=
quote type=3D"cite"><div>On May 22, 2020, at 2:26 PM, Ian Swett &lt;<a href=
=3D"mailto:ianswett=3D40google.com@dmarc.ietf.org" target=3D"_blank" rel=3D=
"noreferrer">ianswett=3D40google.com@dmarc.ietf.org</a>&gt; wrote:</div><br=
><div><div dir=3D"ltr">Hi IPPM,<br><br>At our virtual interim meeting, we d=
ecided draft-ietf-ippm-stamp-option-tlv was ready for last call. This email=
 starts a two-week WGLC for this draft.<br><br>The latest version can be fo=
und here: <a href=3D"https://tools.ietf.org/html/draft-ietf-ippm-stamp-opti=
on-tlv-04" target=3D"_blank" rel=3D"noreferrer">https://tools.ietf.org/html=
/draft-ietf-ippm-stamp-option-tlv-04</a><br><br>This last call will end on =
<b>Monday, June 8th</b>. Please reply to <a href=3D"mailto:ippm@ietf.org" t=
arget=3D"_blank" rel=3D"noreferrer">ippm@ietf.org</a> with your reviews and=
 comments.<br><br>Thanks,<br>Ian &amp; Tommy</div>
_______________________________________________<br>ippm mailing list<br><a =
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From: Ernesto Ruffini <eruffini@outsys.org>
To: Ian Swett <ianswett=40google.com@dmarc.ietf.org>
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Subject: Re: [ippm] WGLC for STAMP Extensions
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<!DOCTYPE html>
<html><head>
    <meta charset=3D"UTF-8">
</head><body><p>Hi,</p><p>As co-author, I support the publication of this d=
raft, and I am not aware of any IPR related to this draft</p><p>Regards,</p=
><p>Ernesto</p><p><br></p><p><br></p><blockquote type=3D"cite">Il 25 maggio=
 2020 alle 7.46 Henrik Nydell &#60;hnydell@accedian.com&#62; ha scritto: <b=
r> <br><div dir=3D"auto">As co-author I support the publication, and am not=
 aware of any IPR related to this document.<div dir=3D"auto"><br></div><div=
 dir=3D"auto">Cheers</div><div dir=3D"auto">Henrik&#160;</div></div><br><di=
v class=3D"ox-b348863493-gmail_quote"><div dir=3D"ltr" class=3D"ox-b3488634=
93-gmail_attr">On Sat, 23 May 2020, 00:55 Tommy Pauly, &#60;tpauly=3D <a hr=
ef=3D"mailto:40apple.com@dmarc.ietf.org">40apple.com@dmarc.ietf.org</a>&#62=
; wrote: <br></div><blockquote><div style=3D"word-wrap: break-word;">Hi IPP=
M,<div><br></div><div>As part of the WGLC, we also need to assign a documen=
t shepherd. If you are interested in helping out by shepherding this docume=
nt, please email the chairs!</div><div><br></div><div>Also, if you are awar=
e of any IPR on this document, please report and let the list know.</div><d=
iv><br></div><div>Best,</div><div>Tommy &#38; Ian <br><div><br><blockquote =
type=3D"cite"><div>On May 22, 2020, at 2:26 PM, Ian Swett &#60; <a href=3D"=
mailto:ianswett=3D40google.com@dmarc.ietf.org" target=3D"_blank" rel=3D"noo=
pener">ianswett=3D40google.com@dmarc.ietf.org</a>&#62; wrote:</div><br><div=
><div dir=3D"ltr">Hi IPPM, <br> <br>At our virtual interim meeting, we deci=
ded draft-ietf-ippm-stamp-option-tlv was ready for last call. This email st=
arts a two-week WGLC for this draft. <br> <br>The latest version can be fou=
nd here: <a href=3D"https://tools.ietf.org/html/draft-ietf-ippm-stamp-optio=
n-tlv-04" target=3D"_blank" rel=3D"noopener">https://tools.ietf.org/html/dr=
aft-ietf-ippm-stamp-option-tlv-04</a> <br> <br>This last call will end on <=
strong>Monday, June 8th</strong>. Please reply to <a href=3D"mailto:ippm@ie=
tf.org" target=3D"_blank" rel=3D"noopener">ippm@ietf.org</a> with your revi=
ews and comments. <br> <br>Thanks, <br>Ian &#38; Tommy</div>_______________=
________________________________ <br>ippm mailing list <br> <a href=3D"mail=
to:ippm@ietf.org" target=3D"_blank" rel=3D"noopener">ippm@ietf.org</a> <br>=
 <a href=3D"https://www.ietf.org/mailman/listinfo/ippm" target=3D"_blank" r=
el=3D"noopener">https://www.ietf.org/mailman/listinfo/ippm</a> <br></div></=
blockquote></div><br></div></div>__________________________________________=
_____ <br> ippm mailing list <br> <a href=3D"mailto:ippm@ietf.org" target=
=3D"_blank" rel=3D"noopener">ippm@ietf.org</a> <br> <a href=3D"https://www.=
ietf.org/mailman/listinfo/ippm" target=3D"_blank" rel=3D"noopener">https://=
www.ietf.org/mailman/listinfo/ippm</a> <br></blockquote></div><br><p><span =
style=3D"font-size: xx-small;">Avis de confidentialit&#233;</span></p><p><s=
pan style=3D"font-size: xx-small;">Les informations contenues dans le pr&#2=
33;sent message et dans toute pi&#232;ce qui lui est jointe sont confidenti=
elles et peuvent &#234;tre prot&#233;g&#233;es par le secret professionnel.=
 Ces informations sont &#224; l&#8217;usage exclusif de son ou de ses desti=
nataires. Si vous recevez ce message par erreur, veuillez s&#8217;il vous p=
lait communiquer imm&#233;diatement avec l&#8217;exp&#233;diteur et en d&#2=
33;truire tout exemplaire. De plus, il vous est strictement interdit de le =
divulguer, de le distribuer ou de le reproduire sans l&#8217;autorisation d=
e l&#8217;exp&#233;diteur. Merci.</span></p><p><span style=3D"font-size: xx=
-small;">Confidentiality notice</span></p><p><span style=3D"font-size: xx-s=
mall;">This e-mail message and any attachment hereto contain confidential i=
nformation which may be privileged and which is intended for the exclusive =
use of its addressee(s). If you receive this message in error, please infor=
m sender immediately and destroy any copy thereof. Furthermore, any disclos=
ure, distribution or copying of this message and/or any attachment hereto w=
ithout the consent of the sender is strictly prohibited. Thank you.</span><=
/p>_______________________________________________ <br>ippm mailing list <b=
r>ippm@ietf.org <br>https://www.ietf.org/mailman/listinfo/ippm <br></blockq=
uote></body></html>
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Mon, 25 May 2020 14:57:34 -0700
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To: Tommy Pauly <tpauly=40apple.com@dmarc.ietf.org>
Cc: IETF IPPM WG <ippm@ietf.org>
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Subject: Re: [ippm] Second WGLC for draft-ietf-ippm-ioam-data
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--000000000000a0079d05a68011c1
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Dear Authors,
thank you for carefully and thoughtfully addressing my earlier comments,
much appreciated. I've found the document ready with single lonely nit that
is clearly non-blocking:

   - [I-D.lapukhov-dataplane-probe] is listed in the Informative References
   section but not used in the text.


Regards,
Greg

On Thu, May 14, 2020 at 10:16 AM Tommy Pauly <tpauly=
40apple.com@dmarc.ietf.org> wrote:

> Hi IPPM,
>
> At our virtual interim meeting, we decided to
> put draft-ietf-ippm-ioam-data through a second last call, based on the new
> revisions, in mid-May. This email starts a two-week WGLC for this draft.
>
> The latest version can be found here:
> https://tools.ietf.org/html/draft-ietf-ippm-ioam-data-09
>
> This last call will end on *Thursday, May 28*. Please reply to
> ippm@ietf.org with your reviews and comments.
>
> Thanks,
> Tommy & Ian
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm
>

--000000000000a0079d05a68011c1
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Dear Authors,<div>thank you for carefully and thoughtfully=
=C2=A0addressing my earlier comments, much appreciated. I&#39;ve found the =
document ready with single lonely nit that is clearly non-blocking:</div><d=
iv><ul><li>[I-D.lapukhov-dataplane-probe] is listed in the Informative Refe=
rences section but not used in the text.=C2=A0<br></li></ul><div><br></div>=
</div><div>Regards,</div><div>Greg</div></div><br><div class=3D"gmail_quote=
"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, May 14, 2020 at 10:16 AM To=
mmy Pauly &lt;tpauly=3D<a href=3D"mailto:40apple.com@dmarc.ietf.org">40appl=
e.com@dmarc.ietf.org</a>&gt; wrote:<br></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"><div style=3D"overflow-wrap: break-word;">Hi IPPM,<div>=
<br></div><div>At our virtual interim meeting, we decided to put=C2=A0draft=
-ietf-ippm-ioam-data through a second last call, based on the new revisions=
, in mid-May. This email starts a two-week WGLC for this draft.</div><div><=
br></div><div>The latest version can be found here:=C2=A0<a href=3D"https:/=
/tools.ietf.org/html/draft-ietf-ippm-ioam-data-09" target=3D"_blank">https:=
//tools.ietf.org/html/draft-ietf-ippm-ioam-data-09</a></div><div><br></div>=
<div>This last call will end on <b>Thursday, May 28</b>. Please reply to <a=
 href=3D"mailto:ippm@ietf.org" target=3D"_blank">ippm@ietf.org</a> with you=
r reviews and comments.</div><div><br></div><div>Thanks,</div><div>Tommy &a=
mp; Ian</div></div>_______________________________________________<br>
ippm mailing list<br>
<a href=3D"mailto:ippm@ietf.org" target=3D"_blank">ippm@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/ippm" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/ippm</a><br>
</blockquote></div>

--000000000000a0079d05a68011c1--


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This document is almost ready. I have a few review comments and a trail of
nits.

Comments:
1. It's RFC Ed policy to have no more than 5 authors, and you have 12.
Please follow these guidelines
<https://www.rfc-editor.org/policy.html#policy.authlist> to trim the list
down.
2. Throughout the document, there are many lower-case 'must', 'should', or
'may.' These should be reviewed, and most of them changed to upper-case.
Non-upper-case should generally use synonyms like 'might' or 'could'.
3. Section 4.2 says that transit nodes "will update at most one of these
Option Types". I think you mean "at least one of each of these option
types", at least if I'm reading 4.4 correctly.
4. Section 4.4.1 has many normative requirements for the options. What
should transit nodes do if these are not followed (e.g. remainingLen is a
garbage number)? Perhaps there should be an "error flag" in addition to the
Overflow flag?
5. does the pre-allocated option have any sort of initial value the
encapsulation node should set all the trace option data to? Would this
allow the transit nodes to detect if there was a mistake in RemainingLen?

Nits:
Sec 3.
s/using for example packet/using, for example, packet
s/but do not have to share/but do not have to, share
s/data-plane/data planes

Sec 4.3 s/at average/on average

Sec 4.4
s/hardware and software implementations IOAM/hardware and software
implementations, IOAM
s/data.The/data. The
s/devices which either/devices with either

Sec 4.4.1
suggest the sentence
'This bit is set by the network element if there are not enough octets left
to
         record node data, no field is added and the overflow "O-bit"
         must be set to "1" in the IOAM-Trace-Option header.'
be rewritten as
'If there are not enought octets left to record node data, the network
element MUST NOT add a field and MUST set the overflow "O-bit" to "0" in
the IOAM-Trace-Option header.'

s/When set indicates/When set, indicates [multiple times in this section]

Sec 4.4.2
This section could use some subheaders for each node data field

s/hence recommend/and hence RECOMMEND
s/standard unit/standard units

Sec 4.5
Please add a reference for SSSS

Sec 5.3
s/run Linux/run the Linux

Sec 7.8
RFC 8126 says you are supposed to provide guidelines for the expert
reviewer.

-- Martin

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<div dir=3D"ltr">This document is almost ready. I have a few review comment=
s and a trail of nits.<div><br></div><div>Comments:</div><div>1. It&#39;s R=
FC Ed policy to have no more than 5 authors, and you have 12. Please<a href=
=3D"https://www.rfc-editor.org/policy.html#policy.authlist"> follow these g=
uidelines</a> to trim the list down.<br></div><div>2. Throughout the docume=
nt, there are many lower-case &#39;must&#39;, &#39;should&#39;, or &#39;may=
.&#39; These should be reviewed, and most of them changed to upper-case. No=
n-upper-case should generally use synonyms like &#39;might&#39; or &#39;cou=
ld&#39;.<br></div><div>3. Section 4.2 says that transit nodes &quot;will up=
date at most one of these Option Types&quot;. I think you mean &quot;at lea=
st one of each of these option types&quot;, at least if I&#39;m reading 4.4=
 correctly.</div><div>4. Section 4.4.1 has many normative requirements for =
the options. What should transit nodes do if these are not followed (e.g. r=
emainingLen is a garbage number)? Perhaps there should be an &quot;error fl=
ag&quot; in addition to the Overflow flag?</div><div>5. does the pre-alloca=
ted option have any sort of initial value the encapsulation node should set=
 all the trace option data to? Would this allow the transit nodes to detect=
 if there was a mistake in RemainingLen?</div><div><br></div><div>Nits:</di=
v><div>Sec 3. <br></div><div>s/using for example packet/using, for example,=
 packet</div><div>s/but do not have to share/but do not have to, share</div=
><div>s/data-plane/data planes</div><div><br></div><div>Sec 4.3 s/at averag=
e/on average</div><div><br></div><div>Sec 4.4 <br></div><div>s/hardware and=
 software implementations IOAM/hardware and software implementations, IOAM<=
/div><div>s/data.The/data. The</div><div>s/devices which either/devices wit=
h either</div><div><br></div><div>Sec 4.4.1</div><div>suggest the sentence<=
br></div><div>&#39;This bit is set by the network element if there are not =
enough octets left to<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0record node data=
, no field is added and the overflow &quot;O-bit&quot;<br>=C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0must be set to &quot;1&quot; in the IOAM-Trace-Option head=
er.&#39;</div><div>be rewritten as</div><div>&#39;If there are not enought =
octets left to record node data, the network element MUST NOT add a field a=
nd MUST set the overflow &quot;O-bit&quot; to &quot;0&quot; in the IOAM-Tra=
ce-Option header.&#39;</div><div><br></div><div>s/When set indicates/When s=
et, indicates [multiple times in this section]</div><div><br></div><div>Sec=
 4.4.2</div><div>This section could use some subheaders for each node data =
field</div><div><br></div><div>s/hence recommend/and hence RECOMMEND</div><=
div>s/standard unit/standard units</div><div><br></div><div>Sec 4.5</div><d=
iv>Please add a reference for SSSS</div><div><br></div><div>Sec 5.3</div><d=
iv>s/run Linux/run the Linux</div><div><br></div><div>Sec 7.8</div><div>RFC=
 8126 says you are supposed to provide guidelines for the expert reviewer.<=
/div><div><br></div><div>-- Martin<br></div><div><br></div><div><br></div><=
div><br></div><div><br></div><div><div><br></div><div><br></div></div></div=
>

--0000000000005c725705a69563d4--


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From: Tommy Pauly <tpauly@apple.com>
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Date: Wed, 27 May 2020 19:49:11 -0700
In-reply-to: <202005271721263284249@zte.com.cn>
Cc: "IETF IPPM WG (ippm@ietf.org)" <ippm@ietf.org>
To: xiao.min2@zte.com.cn, wangyali11@huawei.com
References: <202005261657347762187@zte.com.cn> <1520992FC97B944A9979C2FC1D7DB0F404E7ADD6@dggeml524-mbx.china.huawei.com> <202005271721263284249@zte.com.cn>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ippm/j88C74dSUXHpHq1_RRvwLk73G_g>
Subject: Re: [ippm] Questions about draft-xiao-ippm-ioam-conf-state
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To be clear regarding IPv4, the guidance in previous meetings has been =
that a standard IPv4 extension is almost certainly not something that =
would progress as a standard. I would suggest not basing work on the =
presence of such an IPv4 extension.

Best,
Tommy

> On May 27, 2020, at 2:21 AM, xiao.min2@zte.com.cn wrote:
>=20
> Hi Yali,
>=20
>=20
>=20
> This draft is a supportive document to IOAM encapsulations, so I =
believe it's too early to consider concrete ICMPv4 extensions, before =
there is rough consensus on IOAM over IPv4 encapsulation.
>=20
>=20
>=20
> Best Regards,
>=20
> Xiao Min
>=20
> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
> =E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9Awangyali <wangyali11@huawei.com =
<mailto:wangyali11@huawei.com>>
> =E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A=E8=82=96=E6=95=8F10093570;
> =E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9Aippm@ietf.org =
<mailto:ippm@ietf.org> <ippm@ietf.org <mailto:ippm@ietf.org>>;
> =E6=97=A5 =E6=9C=9F =EF=BC=9A2020=E5=B9=B405=E6=9C=8827=E6=97=A5 10:11
> =E4=B8=BB =E9=A2=98 =EF=BC=9ARE: Re:[ippm] Questions about =
draft-xiao-ippm-ioam-conf-state
> Hi Min,
> =20
> Thanks for your reply. Please see inline [Yali].
> =20
> Best regards,
> Yali
> =20
> From: xiao.min2@zte.com.cn [mailto:xiao.min2@zte.com.cn]
> Sent: Tuesday, May 26, 2020 4:58 PM
> To: wangyali <wangyali11@huawei.com>
> Cc: ippm@ietf.org
> Subject: Re:[ippm] Questions about draft-xiao-ippm-ioam-conf-state
> =20
> Hi Yali,
>=20
> =20
>=20
> Many thanks for your review and questions.
>=20
> Please see my inline reply with <XM>.
>=20
> =20
>=20
> Best Regards,
>=20
> Xiao Min
>=20
> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
> =E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9Awangyali <wangyali11@huawei.com =
<mailto:wangyali11@huawei.com>>
> =E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9Aippm@ietf.org =
<mailto:ippm@ietf.org> <ippm@ietf.org <mailto:ippm@ietf.org>>;
> =E6=97=A5=E6=9C=9F=EF=BC=9A2020=E5=B9=B405=E6=9C=8824=E6=97=A5 19:50
> =E4=B8=BB=E9=A2=98=EF=BC=9A[ippm] Questions about =
draft-xiao-ippm-ioam-conf-state
> _______________________________________________
> ippm mailing list
> ippm@ietf.org <mailto:ippm@ietf.org>
> https://www.ietf.org/mailman/listinfo/ippm =
<https://www.ietf.org/mailman/listinfo/ippm>
> Hi authors,
> =20
> This is Yali. This is an interesting work. I have following two =
questions.
> =20
> First, is the list of Namespace-IDs the subset or all of Namespaces =
which the IOAM encapsulating node belongs to? If it is, I suggest adding =
some words to illustrate this.
> <XM>  Yes, you're correct. I'll make it more clear in the next =
revision.
>  [Yali] OK. Thanks.
> Second, could this extension to the echo request/reply mechanisms also =
be used in ICMP defined for IPv4?
> <XM>  In theory the mechanism described in this draft can also apply =
to ICMPv4, whereas I believe ICMPv4 needs to be taken into account only =
after the IOAM over IPv4 is defined. Currently the IOAM over IPv6 has =
been adopted in IPPM WG as draft-ietf-ippm-ioam-ipv6-options, if you're =
interested, we can work together on ICMPv6 first.
>  [Yali] IOAM over IPv6 is important. While considering a scenario that =
IOAM applied in the legacy IPv4 network, I think the problem of echo =
request/reply IOAM node capabilities also needs to be taken account. But =
it may be discussed in another draft later.
> In my opinion, as the Information Request and Reply Type=3D15 and =
Type=3D16 have been obsolete [RFC6918], so it could be used as the IOAM =
Capability echo request/reply messages to acquire the enabled IOAM =
capabilities.
>  [Yali] Do you think this is a way to request/reply IOAM capabilities?
> Thanks,
> Yali
> =20
> =20
>=20
>=20
>=20
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">To =
be clear regarding IPv4, the guidance in previous meetings has been that =
a standard IPv4 extension is almost certainly not something that would =
progress as a standard. I would suggest not basing work on the presence =
of such an IPv4 extension.<div class=3D""><br class=3D""></div><div =
class=3D"">Best,</div><div class=3D"">Tommy<br class=3D""><div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">On May =
27, 2020, at 2:21 AM, <a href=3D"mailto:xiao.min2@zte.com.cn" =
class=3D"">xiao.min2@zte.com.cn</a> wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"zcontentRow" style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;"><p style=3D"margin-right: 0cm; margin-left: 0cm; font-size: 14px; =
font-family: arial;" class=3D"">Hi Yali,</p><p style=3D"margin-right: =
0cm; margin-left: 0cm; font-size: 14px; font-family: arial;" =
class=3D""><br class=3D""></p><p style=3D"margin-right: 0cm; =
margin-left: 0cm; font-size: 14px; font-family: arial;" class=3D"">This =
draft is a supportive document to IOAM encapsulations, so I believe it's =
too early to consider concrete ICMPv4 extensions, before there is rough =
consensus on IOAM over IPv4 encapsulation.<br class=3D""></p><p =
style=3D"margin-right: 0cm; margin-left: 0cm; font-size: 14px; =
font-family: arial;" class=3D""><br class=3D""></p><p =
style=3D"margin-right: 0cm; margin-left: 0cm; font-size: 14px; =
font-family: arial;" class=3D"">Best Regards,</p><p style=3D"margin-right:=
 0cm; margin-left: 0cm; font-size: 14px; font-family: arial;" =
class=3D"">Xiao Min</p><div class=3D"zMailSign" =
unonamech=3D"=E8=82=96=E6=95=8F10093570" =
unonameen=3D"xiaomin10093570"><div =
class=3D"zMailSignContent"></div></div><div class=3D"zMailFrom"></div><div=
 class=3D""><div class=3D"zhistoryRow" style=3D"display: block;"><div =
class=3D"zhistoryDes" language-data=3D"HistoryOrgTxt" style=3D"width: =
1033px; height: 28px; line-height: 28px; background-color: rgb(224, 229, =
233); color: rgb(19, 136, 255); text-align: =
center;">=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6</div><div =
id=3D"zwriteHistoryContainer" class=3D""><div class=3D"zhistoryPanel =
control-group"><div class=3D"zhistoryHeader" style=3D"padding: 8px; =
background-color: rgb(245, 246, 248);"><div class=3D""><strong =
language-data=3D"HistorySenderTxt" class=3D"">=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=
=BC=9A</strong><span class=3D"zreadUserName">wangyali &lt;<a =
href=3D"mailto:wangyali11@huawei.com" style=3D"color: rgb(149, 79, 114); =
text-decoration: underline;" =
class=3D"">wangyali11@huawei.com</a>&gt;</span></div><div =
class=3D""><strong language-data=3D"HistoryTOTxt" =
class=3D"">=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A</strong><span =
class=3D"zreadUserName" style=3D"display: =
inline;">=E8=82=96=E6=95=8F10093570;</span></div><div class=3D""><strong =
language-data=3D"HistoryCCTxt" class=3D"">=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=
=9A</strong><span class=3D"zreadUserName" style=3D"display: inline;"><a =
href=3D"mailto:ippm@ietf.org" style=3D"color: rgb(149, 79, 114); =
text-decoration: underline;" class=3D"">ippm@ietf.org</a><span =
class=3D"Apple-converted-space">&nbsp;</span>&lt;<a =
href=3D"mailto:ippm@ietf.org" style=3D"color: rgb(149, 79, 114); =
text-decoration: underline;" =
class=3D"">ippm@ietf.org</a>&gt;;</span></div><div class=3D""><strong =
language-data=3D"HistoryDateTxt" class=3D"">=E6=97=A5 =E6=9C=9F =
=EF=BC=9A</strong><span class=3D"">2020=E5=B9=B405=E6=9C=8827=E6=97=A5 =
10:11</span></div><div class=3D""><strong =
language-data=3D"HistorySubjectTxt" class=3D"">=E4=B8=BB =E9=A2=98 =
=EF=BC=9A</strong><span class=3D"zreadTitle"><strong class=3D"">RE: =
Re:[ippm] Questions about =
draft-xiao-ippm-ioam-conf-state</strong></span></div></div><div =
zmailbusiness=3D"businessExternal" class=3D""></div><div =
class=3D"zhistoryContent"><div class=3D""><div class=3D"WordSection1" =
style=3D"page: WordSection1;"><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Hi Min,<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Thanks for your reply. =
Please see inline [Yali].<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">Best regards,<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">Yali<o:p class=3D""></o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><strong class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">From:</span></strong><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:xiao.min2@zte.com.cn" class=3D"">xiao.min2@zte.com.cn</a> =
[<a href=3D"mailto:xiao.min2@zte.com.cn" =
class=3D"">mailto:xiao.min2@zte.com.cn</a>]<br class=3D""><strong =
class=3D"">Sent:</strong><span =
class=3D"Apple-converted-space">&nbsp;</span>Tuesday, May 26, 2020 4:58 =
PM<br class=3D""><strong class=3D"">To:</strong><span =
class=3D"Apple-converted-space">&nbsp;</span>wangyali &lt;<a =
href=3D"mailto:wangyali11@huawei.com" =
class=3D"">wangyali11@huawei.com</a>&gt;<br class=3D""><strong =
class=3D"">Cc:</strong><span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:ippm@ietf.org" class=3D"">ippm@ietf.org</a><br =
class=3D""><strong class=3D"">Subject:</strong><span =
class=3D"Apple-converted-space">&nbsp;</span>Re:[ippm] Questions about =
draft-xiao-ippm-ioam-conf-state<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div class=3D""><p style=3D"margin-right: =
0cm; margin-left: 0cm; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 10.5pt; =
font-family: Arial, sans-serif;" class=3D"">Hi Yali,<o:p =
class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; margin-left: =
0cm; font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 10.5pt; font-family: Arial, =
sans-serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></span></p><p =
style=3D"margin-right: 0cm; margin-left: 0cm; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-size: 10.5pt; font-family: Arial, sans-serif;" =
class=3D"">Many thanks for your review and questions.<o:p =
class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; margin-left: =
0cm; font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 10.5pt; font-family: Arial, =
sans-serif;" class=3D"">Please see my inline reply with &lt;XM&gt;.<o:p =
class=3D""></o:p></span></p><p style=3D"margin-right: 0cm; margin-left: =
0cm; font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 10.5pt; font-family: Arial, =
sans-serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></span></p><p =
style=3D"margin-right: 0cm; margin-left: 0cm; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-size: 10.5pt; font-family: Arial, sans-serif;" =
class=3D"">Best Regards,<o:p class=3D""></o:p></span></p><p =
style=3D"margin-right: 0cm; margin-left: 0cm; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
style=3D"font-size: 10.5pt; font-family: Arial, sans-serif;" =
class=3D"">Xiao Min<o:p class=3D""></o:p></span></p><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif; text-align: center; =
line-height: 21pt; background-color: rgb(224, 229, 233);" class=3D""><span=
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136, 255);" class=3D"">=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6</span><span =
style=3D"color: rgb(19, 136, 255);" class=3D""><o:p =
class=3D""></o:p></span></div><div id=3D"zwriteHistoryContainer" =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif; background-color: rgb(245, 246, =
248);" class=3D""><strong class=3D""><span lang=3D"ZH-CN" =
style=3D"font-family: =E5=AE=8B=E4=BD=93;" =
class=3D"">=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A</span></strong><span =
class=3D"zreadusername">wangyali &lt;</span><a =
href=3D"mailto:wangyali11@huawei.com" target=3D"_blank" style=3D"color: =
rgb(149, 79, 114); text-decoration: underline;" =
class=3D"">wangyali11@huawei.com</a><span =
class=3D"zreadusername">&gt;</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif; background-color: =
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style=3D"font-family: =E5=AE=8B=E4=BD=93;" =
class=3D"">=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A</span></strong><a =
href=3D"mailto:ippm@ietf.org" target=3D"_blank" style=3D"color: rgb(149, =
79, 114); text-decoration: underline;" class=3D"">ippm@ietf.org</a><span =
class=3D"zreadusername"><span =
class=3D"Apple-converted-space">&nbsp;</span>&lt;</span><a =
href=3D"mailto:ippm@ietf.org" target=3D"_blank" style=3D"color: rgb(149, =
79, 114); text-decoration: underline;" class=3D"">ippm@ietf.org</a><span =
class=3D"zreadusername">&gt;;</span><o:p class=3D""></o:p></div></div><div=
 class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif; background-color: =
rgb(245, 246, 248);" class=3D""><strong class=3D""><span lang=3D"ZH-CN" =
style=3D"font-family: =E5=AE=8B=E4=BD=93;" class=3D"">=E6=97=A5</span><spa=
n lang=3D"ZH-CN" class=3D""></span></strong><strong class=3D""><span =
lang=3D"ZH-CN" style=3D"font-family: =E5=AE=8B=E4=BD=93;" =
class=3D"">=E6=9C=9F</span><span lang=3D"ZH-CN" =
class=3D""></span></strong><strong class=3D""><span lang=3D"ZH-CN" =
style=3D"font-family: =E5=AE=8B=E4=BD=93;" =
class=3D"">=EF=BC=9A</span></strong>2020<span lang=3D"ZH-CN" =
style=3D"font-family: =E5=AE=8B=E4=BD=93;" class=3D"">=E5=B9=B4</span>05<s=
pan lang=3D"ZH-CN" style=3D"font-family: =E5=AE=8B=E4=BD=93;" =
class=3D"">=E6=9C=88</span>24<span lang=3D"ZH-CN" style=3D"font-family: =
=E5=AE=8B=E4=BD=93;" class=3D"">=E6=97=A5</span><span =
class=3D"Apple-converted-space">&nbsp;</span>19:50<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif; background-color: rgb(245, 246, 248);" class=3D""><strong =
class=3D""><span lang=3D"ZH-CN" style=3D"font-family: =E5=AE=8B=E4=BD=93;"=
 class=3D"">=E4=B8=BB</span><span lang=3D"ZH-CN" =
class=3D""></span></strong><strong class=3D""><span lang=3D"ZH-CN" =
style=3D"font-family: =E5=AE=8B=E4=BD=93;" class=3D"">=E9=A2=98</span><spa=
n lang=3D"ZH-CN" class=3D""></span></strong><strong class=3D""><span =
lang=3D"ZH-CN" style=3D"font-family: =E5=AE=8B=E4=BD=93;" =
class=3D"">=EF=BC=9A</span>[ippm] Questions about =
draft-xiao-ippm-ioam-conf-state</strong><o:p =
class=3D""></o:p></div></div></div><div class=3D""><p class=3D"MsoNormal" =
style=3D"margin: 0cm 0cm 12pt; font-size: 12pt; font-family: &quot;Times =
New Roman&quot;, =
serif;">_______________________________________________<br =
class=3D"">ippm&nbsp;mailing&nbsp;list<br class=3D""><a =
href=3D"mailto:ippm@ietf.org" target=3D"_blank" style=3D"color: rgb(149, =
79, 114); text-decoration: underline;" class=3D"">ippm@ietf.org</a><br =
class=3D""><a href=3D"https://www.ietf.org/mailman/listinfo/ippm" =
target=3D"_blank" style=3D"color: rgb(149, 79, 114); text-decoration: =
underline;" class=3D"">https://www.ietf.org/mailman/listinfo/ippm</a><o:p =
class=3D""></o:p></p><div class=3D""><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D"">Hi authors,<o:p class=3D""></o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D"">This is Yali. This is an interesting work. I have following =
two questions.<o:p class=3D""></o:p></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D"">&nbsp;<o:p class=3D""></o:p></div><div style=3D"margin:=
 0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D"">First, is the list of Namespace-IDs the =
subset or all of Namespaces which the IOAM encapsulating node belongs =
to? If it is, I suggest adding some words to illustrate this.<o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D"">&lt;XM&gt; &nbsp;Yes, you're correct. I'll make it more clear =
in the next revision.<o:p class=3D""></o:p></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D"">&nbsp;<span style=3D"color: rgb(31, 73, =
125);" class=3D"">[Yali] OK. Thanks.</span><o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D"">Second, could this extension to the echo request/reply =
mechanisms also be used in ICMP defined for IPv4?<o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D"">&lt;XM&gt; &nbsp;In theory the mechanism described in this =
draft can also apply to ICMPv4, whereas I believe ICMPv4 needs to be =
taken into account only after the IOAM over IPv4 is defined. Currently =
the IOAM over IPv6 has been adopted in IPPM WG =
as&nbsp;draft-ietf-ippm-ioam-ipv6-options, if you're interested, we can =
work together on ICMPv6 first.<o:p class=3D""></o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D"">&nbsp;<span =
style=3D"color: rgb(31, 73, 125);" class=3D"">[Yali] IOAM over IPv6 is =
important. While considering a scenario that IOAM applied in the legacy =
IPv4 network, I think the problem of echo request/reply IOAM node =
capabilities also needs to be taken account. But it may be discussed in =
another draft later.<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D"">In my opinion, as the =
Information Request and Reply Type=3D15 and Type=3D16 have been obsolete =
[RFC6918], so it could be used as the IOAM Capability echo request/reply =
messages to acquire the enabled IOAM capabilities.<o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"color: rgb(31, 73, 125);" =
class=3D"">&nbsp;[Yali] Do you think this is a way to request/reply IOAM =
capabilities?<o:p class=3D""></o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D"">Thanks,<o:p class=3D""></o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D"">Yali<o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div></div></div></div></div></div><p =
style=3D"margin-right: 0cm; margin-left: 0cm; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></p></div></div></div></div></div></div></div></div=
><p style=3D"margin-right: 0cm; margin-left: 0cm; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><br =
class=3D""></p></div><span style=3D"caret-color: rgb(0, 0, 0); =
font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
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normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">_______________________________________________</span><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" class=3D""><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
display: inline !important;" class=3D"">ippm mailing list</span><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" class=3D""><span =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
12px; font-style: normal; font-variant-caps: normal; font-weight: =
normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
display: inline !important;" class=3D""><a href=3D"mailto:ippm@ietf.org" =
class=3D"">ippm@ietf.org</a></span><br style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;" class=3D""><span style=3D"caret-color: rgb(0, 0, =
0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D""><a href=3D"https://www.ietf.org/mailman/listinfo/ippm" =
class=3D"">https://www.ietf.org/mailman/listinfo/ippm</a></span></div></bl=
ockquote></div><br class=3D""></div></body></html>=

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From: wangyali <wangyali11@huawei.com>
To: Tommy Pauly <tpauly@apple.com>, "xiao.min2@zte.com.cn" <xiao.min2@zte.com.cn>
CC: "IETF IPPM WG (ippm@ietf.org)" <ippm@ietf.org>
Thread-Topic: [ippm] Questions about draft-xiao-ippm-ioam-conf-state
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To: Martin Duke <martin.h.duke@gmail.com>, "draft-ietf-ippm-ioam-data.all@ietf.org" <draft-ietf-ippm-ioam-data.all@ietf.org>, "ippm@ietf.org" <ippm@ietf.org>
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Subject: Re: [ippm] draft-ippm-ioam-data-09 WGLC comments
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From: "Frank Brockners (fbrockne)" <fbrockne@cisco.com>
To: Greg Mirsky <gregimirsky@gmail.com>, Tommy Pauly <tpauly=40apple.com@dmarc.ietf.org>
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Thread-Topic: [ippm] Second WGLC for draft-ietf-ippm-ioam-data
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Subject: Re: [ippm] Second WGLC for draft-ietf-ippm-ioam-data
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Cc: Martin Duke <martin.h.duke@gmail.com>, "draft-ietf-ippm-ioam-data.all@ietf.org" <draft-ietf-ippm-ioam-data.all@ietf.org>, "ippm@ietf.org" <ippm@ietf.org>
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Subject: Re: [ippm] draft-ippm-ioam-data-09 WGLC comments
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> On May 28, 2020, at 6:06 AM, Frank Brockners (fbrockne) =
<fbrockne@cisco.com> wrote:
>=20
> Hi Martin,
> =20
> Thanks a lot for the detailed review. Please see inline (=E2=80=9C=E2=80=
=A6FB=E2=80=9D).
> =20
> From: Martin Duke <martin.h.duke@gmail.com =
<mailto:martin.h.duke@gmail.com>>=20
> Sent: Mittwoch, 27. Mai 2020 01:24
> To: draft-ietf-ippm-ioam-data.all@ietf.org =
<mailto:draft-ietf-ippm-ioam-data.all@ietf.org>; ippm@ietf.org =
<mailto:ippm@ietf.org>
> Subject: draft-ippm-ioam-data-09 WGLC comments
> =20
> This document is almost ready. I have a few review comments and a =
trail of nits.
> =20
> Comments:
> 1. It's RFC Ed policy to have no more than 5 authors, and you have 12. =
Please=C2=A0follow these guidelines =
<https://www.rfc-editor.org/policy.html#policy.authlist> to trim the =
list down.
> =E2=80=A6FB: The topic was brought up and discussed several times, =
though there is no easy solution, given that IOAM had indeed many cooks =
and at least I am not able to find appropriate reasons to prune the list =
of authors to 5. I=E2=80=99m hoping for some guidance from the WG chairs =
on how to handle the issue.

We would like to see this changed to an editor model, in which one or =
two authors are listed as editors, and there is an Authors section in =
the text below to correctly attribute the contributors. No need to prune =
anyone out or choose people to fit in the list of 5, but there=E2=80=99s =
not a need to have the list at the top versus elsewhere in the text.

> =20
> 2. Throughout the document, there are many lower-case 'must', =
'should', or 'may.' These should be reviewed, and most of them changed =
to upper-case. Non-upper-case should generally use synonyms like 'might' =
or 'could'.
> =E2=80=A6FB: We=E2=80=99ll review all the lower-case must/should/may =
statements once more and see whether there is a need to change to =
uppercase. My current understanding (please correct me if I=E2=80=99m =
wrong) was that per RFC 8174, the use of lower case must/may/should =
would be ok =E2=80=93 we can of course see whether we can improve the =
wording to make sure things are not misread.=20

It=E2=80=99s also my understanding that a lowercase must/should/etc is =
technically fine, and not to be interpreted as MUST/SHOULD/etc. However, =
it is a best practice to use other verbiage to avoid possible confusion. =
Different reviewers have different opinions on this one =3D)

Tommy (as co-chair)

>=20
> 3. Section 4.2 says that transit nodes "will update at most one of =
these Option Types". I think you mean "at least one of each of these =
option types", at least if I'm reading 4.4 correctly.
> =E2=80=A6FB: It is indeed =E2=80=9Cwill update at most one of these =
Option Types=E2=80=9D - because for tracing it is either prealloc-update =
OR incremental-update OR no-operation, i.e. a node will either do =
nothing or update one of the Option-Types, but never both at the same =
time.=20
>=20
> 4. Section 4.4.1 has many normative requirements for the options. What =
should transit nodes do if these are not followed (e.g. remainingLen is =
a garbage number)? Perhaps there should be an "error flag" in addition =
to the Overflow flag?
> =E2=80=A6FB: IMHO we can follow typical design principles here, i.e. =
be loose/tolerant on what you accept, strict on what you send. We can =
add a sentence that if a node receives a packet with IOAM data fields =
that it cannot decode/understand, it would simply ignore the IOAM data =
fields. Having a node figure out whether the IOAM data is really =
corrupted or not might be hard to achieve (e.g. it could be some future =
version that the node just does not understand).
> =20
> 5. does the pre-allocated option have any sort of initial value the =
encapsulation node should set all the trace option data to? Would this =
allow the transit nodes to detect if there was a mistake in =
RemainingLen?=20
> =E2=80=A6FB: If we go with the above assumption, that nodes that do =
not understand the IOAM data fields would simply ignore them and leave =
the packet untouched, we would not benefit from any pre-set value on =
allocation. Depending on the implementation, pre-defined values may =
impose an additional burden on the encap node.
> =20
> Nits:
> Sec 3.=20
> s/using for example packet/using, for example, packet
> s/but do not have to share/but do not have to, share
> s/data-plane/data planes
> =20
> Sec 4.3 s/at average/on average
> =20
> Sec 4.4=20
> s/hardware and software implementations IOAM/hardware and software =
implementations, IOAM
> s/data.The/data. The
> s/devices which either/devices with either
> =20
> Sec 4.4.1
> suggest the sentence
> 'This bit is set by the network element if there are not enough octets =
left to
>          record node data, no field is added and the overflow "O-bit"
>          must be set to "1" in the IOAM-Trace-Option header.'
> be rewritten as
> 'If there are not enought octets left to record node data, the network =
element MUST NOT add a field and MUST set the overflow "O-bit" to "0" in =
the IOAM-Trace-Option header.'
> =20
> s/When set indicates/When set, indicates [multiple times in this =
section]
> =20
> Sec 4.4.2
> This section could use some subheaders for each node data field
> =20
> s/hence recommend/and hence RECOMMEND
> s/standard unit/standard units
> =20
> Sec 4.5
> Please add a reference for SSSS
> =20
> Sec 5.3
> s/run Linux/run the Linux
> =20
> Sec 7.8
> RFC 8126 says you are supposed to provide guidelines for the expert =
reviewer.
> =20
> =E2=80=A6FB: Thanks for catching all those nits! Greatly appreciated.
> =20
> Cheers, Frank
> =20
> -- Martin


--Apple-Mail=_ADBA56A1-5DE0-4FEB-9CC3-D4EA01173C26
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><br =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On May 28, 2020, at 6:06 AM, Frank Brockners (fbrockne) =
&lt;<a href=3D"mailto:fbrockne@cisco.com" =
class=3D"">fbrockne@cisco.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;"><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">Hi =
Martin,<o:p class=3D""></o:p></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Thanks a lot for the detailed review. Please see inline =
(=E2=80=9C=E2=80=A6FB=E2=80=9D).<o:p class=3D""></o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div =
style=3D"border-style: none none none solid; border-left-width: 1.5pt; =
border-left-color: blue; padding: 0cm 0cm 0cm 4pt;" class=3D""><div =
class=3D""><div style=3D"border-style: solid none none; =
border-top-width: 1pt; border-top-color: rgb(225, 225, 225); padding: =
3pt 0cm 0cm;" class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><b =
class=3D"">From:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Martin Duke &lt;<a =
href=3D"mailto:martin.h.duke@gmail.com" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">martin.h.duke@gmail.com</a>&gt;<span =
class=3D"Apple-converted-space">&nbsp;</span><br class=3D""><b =
class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Mittwoch, 27. Mai 2020 =
01:24<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:draft-ietf-ippm-ioam-data.all@ietf.org" style=3D"color: =
purple; text-decoration: underline;" =
class=3D"">draft-ietf-ippm-ioam-data.all@ietf.org</a>;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:ippm@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D"">ippm@ietf.org</a><br class=3D""><b =
class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>draft-ippm-ioam-data-09 =
WGLC comments<o:p class=3D""></o:p></div></div></div><div style=3D"margin:=
 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">This document is almost ready. I have a =
few review comments and a trail of nits.<o:p class=3D""></o:p></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Comments:<o:p class=3D""></o:p></div></div><div class=3D""><div=
 style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">1. It's RFC Ed policy to have no more =
than 5 authors, and you have 12. Please<a =
href=3D"https://www.rfc-editor.org/policy.html#policy.authlist" =
style=3D"color: purple; text-decoration: underline;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>follow these =
guidelines</a><span class=3D"Apple-converted-space">&nbsp;</span>to trim =
the list down.<o:p class=3D""></o:p></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">=E2=80=A6FB: The topic was brought up and discussed several =
times, though there is no easy solution, given that IOAM had indeed many =
cooks and at least I am not able to find appropriate reasons to prune =
the list of authors to 5. I=E2=80=99m hoping for some guidance from the =
WG chairs on how to handle the =
issue.</div></div></div></div></div></div></blockquote><div><br =
class=3D""></div><div>We would like to see this changed to an editor =
model, in which one or two authors are listed as editors, and there is =
an Authors section in the text below to correctly attribute the =
contributors. No need to prune anyone out or choose people to fit in the =
list of 5, but there=E2=80=99s not a need to have the list at the top =
versus elsewhere in the text.</div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D""><div class=3D"WordSection1" =
style=3D"page: WordSection1; caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;"><div style=3D"border-style: none none none solid; =
border-left-width: 1.5pt; border-left-color: blue; padding: 0cm 0cm 0cm =
4pt;" class=3D""><div class=3D""><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D""></o:p></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">2. Throughout the document, there are =
many lower-case 'must', 'should', or 'may.' These should be reviewed, =
and most of them changed to upper-case. Non-upper-case should generally =
use synonyms like 'might' or 'could'.<o:p class=3D""></o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">=E2=80=A6FB: We=E2=80=99ll review all =
the lower-case must/should/may statements once more and see whether =
there is a need to change to uppercase. My current understanding (please =
correct me if I=E2=80=99m wrong) was that per RFC 8174, the use of lower =
case must/may/should would be ok =E2=80=93 we can of course see whether =
we can improve the wording to make sure things are not misread.<span =
class=3D"Apple-converted-space">&nbsp;</span><br =
class=3D""></div></div></div></div></div></div></blockquote><div><br =
class=3D""></div><div>It=E2=80=99s also my understanding that a =
lowercase must/should/etc is technically fine, and not to be interpreted =
as MUST/SHOULD/etc. However, it is a best practice to use other verbiage =
to avoid possible confusion. Different reviewers have different opinions =
on this one =3D)</div><div><br class=3D""></div><div>Tommy (as =
co-chair)</div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><div class=3D"WordSection1" style=3D"page: WordSection1; =
caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;"><div =
style=3D"border-style: none none none solid; border-left-width: 1.5pt; =
border-left-color: blue; padding: 0cm 0cm 0cm 4pt;" class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><br =
class=3D""><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">3. Section 4.2 says that transit nodes =
"will update at most one of these Option Types". I think you mean "at =
least one of each of these option types", at least if I'm reading 4.4 =
correctly.<br class=3D"">=E2=80=A6FB: It is indeed =E2=80=9Cwill update =
at most one of these Option Types=E2=80=9D - because for tracing it is =
either prealloc-update OR incremental-update OR no-operation, i.e. a =
node will either do nothing or update one of the Option-Types, but never =
both at the same time.<span =
class=3D"Apple-converted-space">&nbsp;</span><br class=3D""><br =
class=3D""><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">4. Section 4.4.1 has many normative =
requirements for the options. What should transit nodes do if these are =
not followed (e.g. remainingLen is a garbage number)? Perhaps there =
should be an "error flag" in addition to the Overflow flag?<o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">=E2=80=A6FB=
: IMHO we can follow typical design principles here, i.e. be =
loose/tolerant on what you accept, strict on what you send. We can add a =
sentence that if a node receives a packet with IOAM data fields that it =
cannot decode/understand, it would simply ignore the IOAM data fields. =
Having a node figure out whether the IOAM data is really corrupted or =
not might be hard to achieve (e.g. it could be some future version that =
the node just does not understand).<o:p class=3D""></o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">5. does the pre-allocated option have any sort of initial =
value the encapsulation node should set all the trace option data to? =
Would this allow the transit nodes to detect if there was a mistake in =
RemainingLen?<b class=3D""><i class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span></i></b><br class=3D"">=E2=80=
=A6FB: If we go with the above assumption, that nodes that do not =
understand the IOAM data fields would simply ignore them and leave the =
packet untouched, we would not benefit from any pre-set value on =
allocation. Depending on the implementation, pre-defined values may =
impose an additional burden on the encap node.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Nits:<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Sec 3.<span class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">s/using for example packet/using, for example, packet<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">s/but do not have to share/but do not have to, share<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">s/data-plane/data planes<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Sec 4.3 s/at average/on average<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Sec 4.4<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">s/hardware and software implementations IOAM/hardware and =
software implementations, IOAM<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">s/data.The/data. The<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">s/devices which either/devices with either<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Sec 4.4.1<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">suggest the sentence<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">'This bit is set by the =
network element if there are not enough octets left to<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;record node data, no field =
is added and the overflow "O-bit"<br class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;must be set to "1" in the IOAM-Trace-Option header.'<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">be rewritten as<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">'If there are not enought =
octets left to record node data, the network element MUST NOT add a =
field and MUST set the overflow "O-bit" to "0" in the IOAM-Trace-Option =
header.'<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">s/When set indicates/When set, indicates [multiple times in =
this section]<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Sec 4.4.2<o:p class=3D""></o:p></div></div><div class=3D""><div=
 style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">This section could use some subheaders =
for each node data field<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">s/hence recommend/and hence RECOMMEND<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">s/standard unit/standard units<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Sec 4.5<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Please add a reference for SSSS<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Sec 5.3<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">s/run Linux/run the Linux<o:p class=3D""></o:p></div></div><div=
 class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Sec 7.8<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">RFC 8126 says you are supposed to =
provide guidelines for the expert reviewer.<o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">=E2=80=A6FB=
: Thanks for catching all those nits! Greatly appreciated.<o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">Cheers, =
Frank<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">-- =
Martin</div></div></div></div></div></div></blockquote></div><br =
class=3D""></body></html>=

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From: Tommy Pauly <tpauly@apple.com>
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To: Tommy Pauly <tpauly=40apple.com@dmarc.ietf.org>, IETF IPPM WG <ippm@ietf.org>
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Subject: Re: [ippm] Second WGLC for draft-ietf-ippm-ioam-data
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--Apple-Mail=_E6FBC009-8D23-416D-ADFC-8FEF93F1F671
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain;
	charset=utf-8

Our WGLC call for draft-ietf-ippm-ioam-data is now concluded! Thanks =
everyone.

I=E2=80=99ve marked the document as having WG consensus, and needing a =
revised I-D (to incorporate Martin=E2=80=99s comments). Once that is =
ready and we have the shepherd write-up, we=E2=80=99ll submit this to =
the IESG.

As a reminder, we are still in the WGLC for =
draft-ietf-ippm-stamp-option-tlv. Please review and comment if you have =
not already!

Thanks,
Tommy

> On May 14, 2020, at 10:16 AM, Tommy Pauly =
<tpauly=3D40apple.com@dmarc.ietf.org> wrote:
>=20
> Hi IPPM,
>=20
> At our virtual interim meeting, we decided to put =
draft-ietf-ippm-ioam-data through a second last call, based on the new =
revisions, in mid-May. This email starts a two-week WGLC for this draft.
>=20
> The latest version can be found here: =
https://tools.ietf.org/html/draft-ietf-ippm-ioam-data-09 =
<https://tools.ietf.org/html/draft-ietf-ippm-ioam-data-09>
>=20
> This last call will end on Thursday, May 28. Please reply to =
ippm@ietf.org <mailto:ippm@ietf.org> with your reviews and comments.
>=20
> Thanks,
> Tommy & Ian
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm


--Apple-Mail=_E6FBC009-8D23-416D-ADFC-8FEF93F1F671
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">Our =
WGLC call for draft-ietf-ippm-ioam-data is now concluded! Thanks =
everyone.<div class=3D""><br class=3D""></div><div class=3D"">I=E2=80=99ve=
 marked the document as having WG consensus, and needing a revised I-D =
(to incorporate Martin=E2=80=99s comments). Once that is ready and we =
have the shepherd write-up, we=E2=80=99ll submit this to the =
IESG.</div><div class=3D""><br class=3D""></div><div class=3D"">As a =
reminder, we are still in the WGLC for draft-ietf-ippm-stamp-option-tlv. =
Please review and comment if you have not already!</div><div =
class=3D""><br class=3D""></div><div class=3D"">Thanks,</div><div =
class=3D"">Tommy<br class=3D""><div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D"">On May 14, 2020, at 10:16 AM, =
Tommy Pauly &lt;<a href=3D"mailto:tpauly=3D40apple.com@dmarc.ietf.org" =
class=3D"">tpauly=3D40apple.com@dmarc.ietf.org</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><meta =
http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii" =
class=3D""><div style=3D"word-wrap: break-word; -webkit-nbsp-mode: =
space; line-break: after-white-space;" class=3D"">Hi IPPM,<div =
class=3D""><br class=3D""></div><div class=3D"">At our virtual interim =
meeting, we decided to put&nbsp;draft-ietf-ippm-ioam-data through a =
second last call, based on the new revisions, in mid-May. This email =
starts a two-week WGLC for this draft.</div><div class=3D""><br =
class=3D""></div><div class=3D"">The latest version can be found =
here:&nbsp;<a =
href=3D"https://tools.ietf.org/html/draft-ietf-ippm-ioam-data-09" =
class=3D"">https://tools.ietf.org/html/draft-ietf-ippm-ioam-data-09</a></d=
iv><div class=3D""><br class=3D""></div><div class=3D"">This last call =
will end on <b class=3D"">Thursday, May 28</b>. Please reply to <a =
href=3D"mailto:ippm@ietf.org" class=3D"">ippm@ietf.org</a> with your =
reviews and comments.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Thanks,</div><div class=3D"">Tommy &amp; =
Ian</div></div>_______________________________________________<br =
class=3D"">ippm mailing list<br class=3D""><a =
href=3D"mailto:ippm@ietf.org" class=3D"">ippm@ietf.org</a><br =
class=3D"">https://www.ietf.org/mailman/listinfo/ippm<br =
class=3D""></div></blockquote></div><br class=3D""></div></body></html>=

--Apple-Mail=_E6FBC009-8D23-416D-ADFC-8FEF93F1F671--


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From: "Frank Brockners (fbrockne)" <fbrockne@cisco.com>
To: "xiao.min2@zte.com.cn" <xiao.min2@zte.com.cn>, "ippm@ietf.org" <ippm@ietf.org>, "tpauly=40apple.com@dmarc.ietf.org" <tpauly=40apple.com@dmarc.ietf.org>
Thread-Topic: [ippm] Second WGLC for draft-ietf-ippm-ioam-data
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Date: Fri, 29 May 2020 08:04:48 +0000
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Thread-Topic: Re:[ippm] Second WGLC for draft-ietf-ippm-ioam-data
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Subject: Re: [ippm] Second WGLC for draft-ietf-ippm-ioam-data
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From: "Songyuezhong (songyuezhong, IP technology Research Dept)" <songyuezhong@huawei.com>
To: Ian Swett <ianswett=40google.com@dmarc.ietf.org>, "IETF IPPM WG (ippm@ietf.org)" <ippm@ietf.org>
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--_000_48ED4E513E517844B7A0FAA7C5B661164919EEB6dggemm513mbxchi_--


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Tommy Pauly has requested publication of draft-ietf-ippm-route-07 as Proposed Standard on behalf of the IPPM working group.

Please verify the document's state at https://datatracker.ietf.org/doc/draft-ietf-ippm-route/



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--000000000000059bc205a6e52ce6
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Frank and Xiao Min,

Please see comments inline with [MS].

On Sat, May 30, 2020 at 12:42 AM <xiao.min2@zte.com.cn> wrote:

> Hi Frank,
>
>
> Please see my inline response with <XM2>.
>
>
> Best Regards,
>
> Xiao Min
> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*FrankBrockners(fbrockne) <fbrockne@=
cisco.com>
> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;
> *=E6=8A=84=E9=80=81=E4=BA=BA=EF=BC=9A*ippm@ietf.org <ippm@ietf.org>;tpaul=
y=3D40apple.com@dmarc.ietf.org
> <tpauly=3D40apple.com@dmarc.ietf.org>;
> *=E6=97=A5 =E6=9C=9F =EF=BC=9A*2020=E5=B9=B405=E6=9C=8829=E6=97=A5 19:00
> *=E4=B8=BB =E9=A2=98 =EF=BC=9A**RE: Re:[ippm] Second WGLC for draft-ietf-=
ippm-ioam-data*
>
> Hi Xiao Min,
>
>
>
> There have been quite a few proposals for additional data fields for IOAM
> tracing, see e.g.https://github.com/inband-oam/ietf/issues/154
>
> What we agreed in the past IPPM meetings was that we=E2=80=99d focus on f=
inalizing
> draft-ietf-ippm-ioam-data so that we have a stable foundation that we can
> build upon. The definition of new fields is to be covered by new drafts.
>
> <XM2> I understand. It's reasonable, and by the way, I support its
> publication.
>
>
>
> On your case for a second timestamp: This has been discussed in the past,
> and so far the consensus was that a timestamp field and a transit-delay
> field cover things quite flexibly, given that you can derive associated
> times with simple operations (e.g. if timestamp covers packet-egress time
> and you also capture transit-delay, you could easily calculate
> packet-ingress time).
>
> <XM2> I understand your argument and it's acceptable to me, nevertheless,
> the current text in section 4.4.2 doesn't reflect your statement that
> timestamp can cover packet-egress time.
>
> In section 4.4.2, it says:
>
>    timestamp seconds:  4-octet unsigned integer.  Absolute timestamp in
>       seconds that specifies the time at which the packet was received
>       by the node.
>
>    timestamp subseconds:  4-octet unsigned integer.  Absolute timestamp
>       in subseconds that specifies the time at which the packet was
>       received by the node.
>
> Could you please direct me to the words in section 4.4.2 that say the
> timestamp can cover packet-egress time?
>

[MS] In an earlier message, Frank wrote:

draft-ietf-ippm-ioam-data already includes an option to timestamp packets
> (see e.g. sections 4.4.2 and 4.6 in draft-ietf-ippm-ioam-data-09) which y=
ou
> can use exactly the same way as you propose below, i.e. you can use the
> timestamp field for the time, at which the packet was transmitted by the
> node. What draft-ietf-ippm-ioam-data asks you to do is to properly docume=
nt
> when you timestamp the packet.


[MS] This is not correct. As Xiao Min pointed out, in the IOAM Trace, the
timestamp definition specifies "the time at which the packet was received
by the node".

[MS] In the IOAM Edge-to-Edge option, the timestamp behaves as described in
Frank's comment above, varying in different implementations.

[MS] Even with the timestamp fixed as an ingress timestamp, I agree with
Frank's main point. An egress timestamp can be derived from the ingress
timestamp plus the transit delay.

Mickey


>
>
>
> Cheers, Frank
>
>
>
> *From:* xiao.min2@zte.com.cn <xiao.min2@zte.com.cn>
> *Sent:* Freitag, 29. Mai 2020 11:00
> *To:* Frank Brockners (fbrockne) <fbrockne@cisco.com>
> *Cc:* ippm@ietf.org; tpauly=3D40apple.com@dmarc.ietf.org
> *Subject:* Re:[ippm] Second WGLC for draft-ietf-ippm-ioam-data
>
>
>
> Hi Frank,
>
>
>
> Many thanks for your reply to my comment.
>
> Please see my inline response with <XM>.
>
>
>
> Best Regards,
>
> Xiao Min
>
> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*FrankBrockners(fbrockne) <fbrockne@=
cisco.com>
>
> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*=E8=82=96=E6=95=8F10093570;ippm@iet=
f.org <ippm@ietf.org>;tpauly=3D
> 40apple.com@dmarc.ietf.org <tpauly=3D40apple.com@dmarc.ietf.org>;
>
> *=E6=97=A5**=E6=9C=9F**=EF=BC=9A*2020=E5=B9=B405=E6=9C=8829=E6=97=A5 16:0=
5
>
> *=E4=B8=BB**=E9=A2=98**=EF=BC=9A**RE: [ippm] Second WGLC for draft-ietf-i=
ppm-ioam-data*
>
> Hi Xiao Min,
>
>
>
> my understanding is that there are devices which can calculate transit
> delay, which is why the field was introduced quite a while ago.
>
> <XM> OK, I see, then it's very reasonable to reserve this field of transi=
t
> delay.
>
>
>
> draft-ietf-ippm-ioam-data already includes an option to timestamp packets
> (see e.g. sections 4.4.2 and 4.6 in draft-ietf-ippm-ioam-data-09) which y=
ou
> can use exactly the same way as you propose below, i.e. you can use the
> timestamp field for the time, at which the packet was transmitted by the
> node. What draft-ietf-ippm-ioam-data asks you to do is to properly docume=
nt
> when you timestamp the packet.
>
> <XM> My suggestion might not be clear enough. Actually I want to have two
> timestamps carried in the hop-by-hop trace option data, one timestamp for
> the receiving time and another timestamp for the transmitting time, then
> after the IOAM Data is exported to the collecter, the collecter can use t=
he
> two timestamps to calculate the transit delay of each IOAM transit node. =
Do
> you see it possible to add one more timestamp as IOAM node data field int=
o
> section 4.4.2?
>
>
>
> Cheers, Frank
>
>
>
> *From:* ippm <ippm-bounces@ietf.org>*On Behalf Of *xiao.min2@zte.com.cn
> *Sent:* Freitag, 15. Mai 2020 09:51
> *To:* ippm@ietf.org; tpauly=3D40apple.com@dmarc.ietf.org
> *Subject:* Re: [ippm] Second WGLC for draft-ietf-ippm-ioam-data
>
>
>
> Hi all,
>
>
>
> I have a comment on this draft.
>
> I was told by the implementers of my company that it's difficult to add
> accurate transit delay into the trace option data. The reason is that in
> order to calculate transit delay, the node firstly needs to obtain the ti=
me
> at which the packet is transmitted by the node, which is obtained at PHY
> layer, otherwise, the node can't do any calculation after the time is
> obtained.
>
> If the above issue is common across different implementations, I suggest
> to substitute the "transit delay" with '"timestamp" of the time at which
> the packet is transmitted by the node.
>
>
>
> Best Regards,
>
> Xiao Min
>
> =E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A*TommyPauly <tpauly=3D40apple.com@dm=
arc.ietf.org>
>
> *=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A*IETF IPPM WG <ippm@ietf.org>;
>
> *=E6=97=A5=E6=9C=9F=EF=BC=9A*2020=E5=B9=B405=E6=9C=8815=E6=97=A5 01:16
>
> *=E4=B8=BB**=E9=A2=98**=EF=BC=9A**[ippm] Second WGLC for draft-ietf-ippm-=
ioam-data*
>
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm
>
> Hi IPPM,
>
>
>
> At our virtual interim meeting, we decided to
> put draft-ietf-ippm-ioam-data through a second last call, based on the ne=
w
> revisions, in mid-May. This email starts a two-week WGLC for this draft.
>
>
>
> The latest version can be found here:
> https://tools.ietf.org/html/draft-ietf-ippm-ioam-data-09
>
>
>
> This last call will end on *Thursday, May 28*. Please reply to
> ippm@ietf.org with your reviews and comments.
>
>
>
> Thanks,
>
> Tommy & Ian
>
>
>
>
>
>
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm
>

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

<div dir=3D"ltr"><div>Frank and Xiao Min,</div><div><br></div><div>Please s=
ee comments inline with [MS].</div><div><br><div class=3D"gmail_quote"><div=
 dir=3D"ltr" class=3D"gmail_attr">On Sat, May 30, 2020 at 12:42 AM &lt;<a h=
ref=3D"mailto:xiao.min2@zte.com.cn">xiao.min2@zte.com.cn</a>&gt; wrote:<br>=
</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex"><div><p style=3D"fo=
nt-size:14px;font-family:arial">Hi Frank,</p><p style=3D"font-size:14px;fon=
t-family:arial"><br></p><p style=3D"font-size:14px;font-family:arial">Pleas=
e see my inline response with &lt;XM2&gt;.<br></p><p style=3D"font-size:14p=
x;font-family:arial"><br></p><p style=3D"font-size:14px;font-family:arial">=
Best Regards,</p><p style=3D"font-size:14px;font-family:arial">Xiao Min</p>=
<div><div style=3D"display:block"><div style=3D"width:100%;height:28px;line=
-height:28px;background-color:rgb(224,229,233);color:rgb(19,136,255);text-a=
lign:center">=E5=8E=9F=E5=A7=8B=E9=82=AE=E4=BB=B6</div><div id=3D"gmail-m_-=
3724930375641724220zwriteHistoryContainer"><div><div style=3D"padding:8px;b=
ackground-color:rgb(245,246,248)"><div><strong>=E5=8F=91=E4=BB=B6=E4=BA=BA=
=EF=BC=9A</strong><span>FrankBrockners(fbrockne) &lt;<a href=3D"mailto:fbro=
ckne@cisco.com" target=3D"_blank">fbrockne@cisco.com</a>&gt;</span></div><d=
iv><strong>=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A</strong><span style=3D"disp=
lay:inline">=E8=82=96=E6=95=8F10093570;</span></div><div><strong>=E6=8A=84=
=E9=80=81=E4=BA=BA=EF=BC=9A</strong><span style=3D"display:inline"><a href=
=3D"mailto:ippm@ietf.org" target=3D"_blank">ippm@ietf.org</a> &lt;<a href=
=3D"mailto:ippm@ietf.org" target=3D"_blank">ippm@ietf.org</a>&gt;;</span><s=
pan style=3D"display:inline">tpauly=3D<a href=3D"mailto:40apple.com@dmarc.i=
etf.org" target=3D"_blank">40apple.com@dmarc.ietf.org</a> &lt;tpauly=3D<a h=
ref=3D"mailto:40apple.com@dmarc.ietf.org" target=3D"_blank">40apple.com@dma=
rc.ietf.org</a>&gt;;</span></div><div><strong>=E6=97=A5 =E6=9C=9F =EF=BC=9A=
</strong><span>2020=E5=B9=B405=E6=9C=8829=E6=97=A5 19:00</span></div><div><=
strong>=E4=B8=BB =E9=A2=98 =EF=BC=9A</strong><span><strong>RE: Re:[ippm] Se=
cond WGLC for draft-ietf-ippm-ioam-data</strong></span></div></div><div><di=
v><div><p class=3D"MsoNormal">Hi Xiao Min,<u></u><u></u></p><p class=3D"Mso=
Normal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">There have been quit=
e a few proposals for additional data fields for IOAM tracing, see e.g.<a h=
ref=3D"https://github.com/inband-oam/ietf/issues/154" target=3D"_blank">htt=
ps://github.com/inband-oam/ietf/issues/154</a><u></u><u></u></p><p class=3D=
"MsoNormal">What we agreed in the past IPPM meetings was that we=E2=80=99d =
focus on finalizing draft-ietf-ippm-ioam-data so that we have a stable foun=
dation that we can build upon. The definition of new fields is to be covere=
d by new drafts.<u></u><u></u></p><p class=3D"MsoNormal">&lt;XM2&gt; I unde=
rstand. It&#39;s reasonable, and by the way, I support its publication.</p>=
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">On yo=
ur case for a second timestamp: This has been discussed in the past, and so=
 far the consensus was that a timestamp field and a transit-delay field cov=
er things quite flexibly, given that you can derive associated times with s=
imple
 operations (e.g. if timestamp covers packet-egress time and you also captu=
re transit-delay, you could easily calculate packet-ingress time).<u></u><u=
></u></p><p class=3D"MsoNormal">&lt;XM2&gt; I understand your argument and =
it&#39;s acceptable to me, nevertheless, the current text in section 4.4.2 =
doesn&#39;t reflect your statement that timestamp can cover packet-egress t=
ime.</p><p class=3D"MsoNormal">In section 4.4.2, it says:</p><pre>   timest=
amp seconds:  4-octet unsigned integer.  Absolute timestamp in
      seconds that specifies the time at which the packet was received
      by the node.</pre><p class=3D"MsoNormal"><u></u><u></u></p><pre>   ti=
mestamp subseconds:  4-octet unsigned integer.  Absolute timestamp
      in subseconds that specifies the time at which the packet was
      received by the node.</pre><p class=3D"MsoNormal">Could you please di=
rect me to the words in section 4.4.2 that say the timestamp can cover pack=
et-egress time?<u></u>=C2=A0</p></div></div></div></div></div></div></div><=
/div></blockquote><div><br></div><div>[MS] In an earlier message, Frank wro=
te:<div><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">draft-i=
etf-ippm-ioam-data already includes an option to timestamp packets (see e.g=
. sections 4.4.2 and 4.6 in draft-ietf-ippm-ioam-data-09) which you can use=
 exactly the same way as you propose below, i.e. you can use the timestamp =
field
 for the time, at which the packet was transmitted by the node. What draft-=
ietf-ippm-ioam-data asks you to do is to properly document when you timesta=
mp the packet.</blockquote><div><br></div><div>[MS] This is not correct. As=
 Xiao Min pointed out, in the IOAM Trace, the timestamp definition specifie=
s &quot;the time at which the packet was received by the node&quot;.</div><=
div><br></div><div>[MS] In the IOAM Edge-to-Edge option, the timestamp beha=
ves as described in Frank&#39;s comment above, varying in different impleme=
ntations.</div><div></div></div><div><br></div><div>[MS] Even with the time=
stamp fixed as an ingress timestamp, I agree with Frank&#39;s main point. A=
n egress timestamp can be derived from the ingress timestamp plus the trans=
it delay.</div><div><br></div><div>Mickey</div><div>=C2=A0</div><blockquote=
 class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px so=
lid rgb(204,204,204);padding-left:1ex"><div><div><div style=3D"display:bloc=
k"><div id=3D"gmail-m_-3724930375641724220zwriteHistoryContainer"><div><div=
><div><div><p class=3D"MsoNormal"><u></u><br></p><p class=3D"MsoNormal"><u>=
</u><br><u></u></p><p class=3D"MsoNormal"><u></u><br><u></u></p><p class=3D=
"MsoNormal">Cheers, Frank<u></u><u></u></p><p class=3D"MsoNormal"><u></u>=
=C2=A0<u></u></p><div style=3D"border-top:none;border-right:none;border-bot=
tom:none;border-left:1.5pt solid blue;padding:0cm 0cm 0cm 4pt"><div><div st=
yle=3D"border-right:none;border-bottom:none;border-left:none;border-top:1pt=
 solid rgb(225,225,225);padding:3pt 0cm 0cm"><p class=3D"MsoNormal"><strong=
>From:</strong> <a href=3D"mailto:xiao.min2@zte.com.cn" target=3D"_blank">x=
iao.min2@zte.com.cn</a> &lt;<a href=3D"mailto:xiao.min2@zte.com.cn" target=
=3D"_blank">xiao.min2@zte.com.cn</a>&gt; <br><strong>Sent:</strong> Freitag=
, 29. Mai 2020 11:00<br><strong>To:</strong> Frank Brockners (fbrockne) &lt=
;<a href=3D"mailto:fbrockne@cisco.com" target=3D"_blank">fbrockne@cisco.com=
</a>&gt;<br><strong>Cc:</strong> <a href=3D"mailto:ippm@ietf.org" target=3D=
"_blank">ippm@ietf.org</a>; tpauly=3D<a href=3D"mailto:40apple.com@dmarc.ie=
tf.org" target=3D"_blank">40apple.com@dmarc.ietf.org</a><br><strong>Subject=
:</strong> Re:[ippm] Second WGLC for draft-ietf-ippm-ioam-data<u></u><u></u=
></p></div></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><p><sp=
an style=3D"font-size:10.5pt;font-family:Arial,sans-serif">Hi Frank,<u></u>=
<u></u></span></p><p><span style=3D"font-size:10.5pt;font-family:Arial,sans=
-serif"><u></u>=C2=A0<u></u></span></p><p><span style=3D"font-size:10.5pt;f=
ont-family:Arial,sans-serif">Many thanks for your reply to my comment.<u></=
u><u></u></span></p><p><span style=3D"font-size:10.5pt;font-family:Arial,sa=
ns-serif">Please see my inline response with &lt;XM&gt;.<u></u><u></u></spa=
n></p><p><span style=3D"font-size:10.5pt;font-family:Arial,sans-serif"><u><=
/u>=C2=A0<u></u></span></p><p><span style=3D"font-size:10.5pt;font-family:A=
rial,sans-serif">Best Regards,<u></u><u></u></span></p><p><span style=3D"fo=
nt-size:10.5pt;font-family:Arial,sans-serif">Xiao Min<u></u><u></u></span><=
/p><div><div><p class=3D"MsoNormal" style=3D"text-align:center;line-height:=
21pt;background:rgb(224,229,233)"><span style=3D"font-family:&quot;MS Gothi=
c&quot;;color:rgb(19,136,255)">=E5=8E=9F=E5=A7=8B</span><span style=3D"font=
-family:&quot;Microsoft JhengHei&quot;,sans-serif;color:rgb(19,136,255)">=
=E9=82=AE=E4=BB=B6</span><span style=3D"color:rgb(19,136,255)"><u></u><u></=
u></span></p><div id=3D"gmail-m_-3724930375641724220zwriteHistoryContainer"=
><div><div><div><p class=3D"MsoNormal" style=3D"background:rgb(245,246,248)=
"><strong><span style=3D"font-family:&quot;Microsoft JhengHei&quot;,sans-se=
rif;color:black">=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A</span></strong><span>=
<span style=3D"color:black">FrankBrockners(fbrockne) &lt;<a href=3D"mailto:=
fbrockne@cisco.com" target=3D"_blank">fbrockne@cisco.com</a>&gt;</span></sp=
an><u></u><u></u></p></div><div><p class=3D"MsoNormal" style=3D"background:=
rgb(245,246,248)"><strong><span style=3D"font-family:&quot;MS Gothic&quot;;=
color:black">=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A</span></strong><span><spa=
n style=3D"font-family:&quot;MS Gothic&quot;;color:black">=E8=82=96=E6=95=
=8F</span><span style=3D"color:black"><a href=3D"mailto:10093570%3Bippm@iet=
f.org" target=3D"_blank">10093570;ippm@ietf.org</a>
 &lt;<a href=3D"mailto:ippm@ietf.org" target=3D"_blank">ippm@ietf.org</a>&g=
t;;tpauly=3D<a href=3D"mailto:40apple.com@dmarc.ietf.org" target=3D"_blank"=
>40apple.com@dmarc.ietf.org</a> &lt;<a href=3D"mailto:tpauly=3D40apple.com@=
dmarc.ietf.org" target=3D"_blank">tpauly=3D40apple.com@dmarc.ietf.org</a>&g=
t;;</span></span><u></u><u></u></p></div><div><p class=3D"MsoNormal" style=
=3D"background:rgb(245,246,248)"><strong><span style=3D"font-family:&quot;M=
S Gothic&quot;;color:black">=E6=97=A5</span></strong><strong><span style=3D=
"font-family:Calibri,sans-serif;color:black"></span></strong><strong><span =
style=3D"font-family:&quot;MS Gothic&quot;;color:black">=E6=9C=9F</span></s=
trong><strong><span style=3D"font-family:Calibri,sans-serif;color:black"></=
span></strong><strong><span style=3D"font-family:&quot;MS Gothic&quot;;colo=
r:black">=EF=BC=9A</span></strong><span style=3D"color:black">2020</span><s=
pan style=3D"font-family:&quot;MS Gothic&quot;;color:black">=E5=B9=B4</span=
><span style=3D"color:black">05</span><span style=3D"font-family:&quot;MS G=
othic&quot;;color:black">=E6=9C=88</span><span style=3D"color:black">29</sp=
an><span style=3D"font-family:&quot;MS Gothic&quot;;color:black">=E6=97=A5<=
/span><span style=3D"color:black">
 16:05</span><u></u><u></u></p></div><div><p class=3D"MsoNormal" style=3D"b=
ackground:rgb(245,246,248)"><strong><span style=3D"font-family:&quot;MS Got=
hic&quot;;color:black">=E4=B8=BB</span></strong><strong><span style=3D"font=
-family:Calibri,sans-serif;color:black"></span></strong><strong><span style=
=3D"font-family:&quot;Microsoft JhengHei&quot;,sans-serif;color:black">=E9=
=A2=98</span></strong><strong><span style=3D"font-family:Calibri,sans-serif=
;color:black"></span></strong><strong><span style=3D"font-family:&quot;MS G=
othic&quot;;color:black">=EF=BC=9A</span></strong><strong><span style=3D"fo=
nt-family:Calibri,sans-serif;color:black">RE: [ippm] Second WGLC for draft-=
ietf-ippm-ioam-data</span></strong><u></u><u></u></p></div></div><div><div>=
<p class=3D"MsoNormal">Hi Xiao Min,<u></u><u></u></p><p class=3D"MsoNormal"=
>=C2=A0<u></u><u></u></p><p class=3D"MsoNormal">my understanding is that th=
ere are devices which can calculate transit delay, which is why the field w=
as introduced quite a while ago.<u></u><u></u></p><p class=3D"MsoNormal">&l=
t;XM&gt; OK, I see, then it&#39;s very reasonable to reserve this field of =
transit delay.<u></u><u></u></p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u>=
</p><p class=3D"MsoNormal">draft-ietf-ippm-ioam-data already includes an op=
tion to timestamp packets (see e.g. sections 4.4.2 and 4.6 in draft-ietf-ip=
pm-ioam-data-09) which you can use exactly the same way as you propose belo=
w, i.e. you can use the timestamp field
 for the time, at which the packet was transmitted by the node. What draft-=
ietf-ippm-ioam-data asks you to do is to properly document when you timesta=
mp the packet.<u></u><u></u></p><p class=3D"MsoNormal">&lt;XM&gt; My sugges=
tion might not be clear enough. Actually I want to have two timestamps carr=
ied in the hop-by-hop trace option data, one timestamp for the receiving ti=
me and another timestamp for the transmitting time, then after the IOAM
 Data is exported to the collecter, the collecter can use the two timestamp=
s to calculate the transit delay of each IOAM transit node. Do you see it p=
ossible to add one more timestamp as IOAM node data field into section 4.4.=
2?<u></u><u></u></p><p class=3D"MsoNormal">=C2=A0<u></u><u></u></p><p class=
=3D"MsoNormal">Cheers, Frank<u></u><u></u></p><p class=3D"MsoNormal">=C2=A0=
<u></u><u></u></p><div style=3D"border-top:none;border-right:none;border-bo=
ttom:none;border-left:1.5pt solid blue;padding:0cm 0cm 0cm 4pt"><div><div s=
tyle=3D"border-right:none;border-bottom:none;border-left:none;border-top:1p=
t solid rgb(225,225,225);padding:3pt 0cm 0cm"><p class=3D"MsoNormal"><stron=
g><span style=3D"font-family:Calibri,sans-serif">From:</span></strong> ippm=
 &lt;<a href=3D"mailto:ippm-bounces@ietf.org" target=3D"_blank">ippm-bounce=
s@ietf.org</a>&gt;<strong><span style=3D"font-family:Calibri,sans-serif">On=
 Behalf Of </span></strong><a href=3D"mailto:xiao.min2@zte.com.cn" target=
=3D"_blank">xiao.min2@zte.com.cn</a><br><strong><span style=3D"font-family:=
Calibri,sans-serif">Sent:</span></strong> Freitag, 15. Mai 2020 09:51<br><s=
trong><span style=3D"font-family:Calibri,sans-serif">To:</span></strong> <a=
 href=3D"mailto:ippm@ietf.org" target=3D"_blank">ippm@ietf.org</a>; <a href=
=3D"mailto:tpauly=3D40apple.com@dmarc.ietf.org" target=3D"_blank">tpauly=3D=
40apple.com@dmarc.ietf.org</a><br><strong><span style=3D"font-family:Calibr=
i,sans-serif">Subject:</span></strong> Re: [ippm] Second WGLC for draft-iet=
f-ippm-ioam-data<u></u><u></u></p></div></div><p class=3D"MsoNormal">=C2=A0=
<u></u><u></u></p><div><p><span style=3D"font-size:10.5pt;font-family:Arial=
,sans-serif">Hi all,</span><u></u><u></u></p><p><span style=3D"font-size:10=
.5pt;font-family:Arial,sans-serif">=C2=A0</span><u></u><u></u></p><p><span =
style=3D"font-size:10.5pt;font-family:Arial,sans-serif">I have a comment on=
 this draft.</span><u></u><u></u></p><p><span style=3D"font-size:10.5pt;fon=
t-family:Arial,sans-serif">I was told by the implementers of my company tha=
t it&#39;s difficult to add accurate transit delay into the trace option da=
ta. The reason is that in order to calculate transit delay, the node firstl=
y
 needs to obtain the time at which the packet is transmitted by the node, w=
hich is obtained at PHY layer, otherwise, the node can&#39;t do any calcula=
tion after the time is obtained.</span><u></u><u></u></p><p><span style=3D"=
font-size:10.5pt;font-family:Arial,sans-serif">If the above issue is common=
 across different implementations, I suggest to substitute the &quot;transi=
t delay&quot; with &#39;&quot;timestamp&quot; of the time at which the pack=
et is transmitted by the node.</span><u></u><u></u></p><p><span style=3D"fo=
nt-size:10.5pt;font-family:Arial,sans-serif">=C2=A0</span><u></u><u></u></p=
><p><span style=3D"font-size:10.5pt;font-family:Arial,sans-serif">Best Rega=
rds,</span><u></u><u></u></p><p><span style=3D"font-size:10.5pt;font-family=
:Arial,sans-serif">Xiao Min</span><u></u><u></u></p><div><div><p class=3D"M=
soNormal" style=3D"text-align:center;line-height:21pt;background:rgb(224,22=
9,233)"><span style=3D"font-family:&quot;MS Gothic&quot;;color:rgb(19,136,2=
55)">=E5=8E=9F=E5=A7=8B</span><span style=3D"font-family:&quot;Microsoft Jh=
engHei&quot;,sans-serif;color:rgb(19,136,255)">=E9=82=AE=E4=BB=B6</span><u>=
</u><u></u></p><div id=3D"gmail-m_-3724930375641724220zwriteHistoryContaine=
r"><div><div><div><p class=3D"MsoNormal" style=3D"background:rgb(245,246,24=
8)"><strong><span style=3D"font-family:&quot;Microsoft JhengHei&quot;,sans-=
serif;color:black">=E5=8F=91=E4=BB=B6=E4=BA=BA=EF=BC=9A</span></strong><spa=
n><span style=3D"color:black">TommyPauly &lt;<a href=3D"mailto:tpauly=3D40a=
pple.com@dmarc.ietf.org" target=3D"_blank">tpauly=3D40apple.com@dmarc.ietf.=
org</a>&gt;</span></span><u></u><u></u></p></div><div><p class=3D"MsoNormal=
" style=3D"background:rgb(245,246,248)"><strong><span style=3D"font-family:=
&quot;MS Gothic&quot;;color:black">=E6=94=B6=E4=BB=B6=E4=BA=BA=EF=BC=9A</sp=
an></strong><span><span style=3D"color:black">IETF IPPM WG &lt;<a href=3D"m=
ailto:ippm@ietf.org" target=3D"_blank">ippm@ietf.org</a>&gt;;</span></span>=
<u></u><u></u></p></div><div><p class=3D"MsoNormal" style=3D"background:rgb=
(245,246,248)"><strong><span style=3D"font-family:&quot;MS Gothic&quot;;col=
or:black">=E6=97=A5=E6=9C=9F=EF=BC=9A</span></strong><span style=3D"color:b=
lack">2020</span><span style=3D"font-family:&quot;MS Gothic&quot;;color:bla=
ck">=E5=B9=B4</span><span style=3D"color:black">05</span><span style=3D"fon=
t-family:&quot;MS Gothic&quot;;color:black">=E6=9C=88</span><span style=3D"=
color:black">15</span><span style=3D"font-family:&quot;MS Gothic&quot;;colo=
r:black">=E6=97=A5</span><span style=3D"color:black">
 01:16</span><u></u><u></u></p></div><div><p class=3D"MsoNormal" style=3D"b=
ackground:rgb(245,246,248)"><strong><span style=3D"font-family:&quot;MS Got=
hic&quot;;color:black">=E4=B8=BB</span></strong><strong><span style=3D"font=
-family:&quot;Microsoft JhengHei&quot;,sans-serif;color:black">=E9=A2=98</s=
pan></strong><strong><span style=3D"font-family:&quot;MS Gothic&quot;;color=
:black">=EF=BC=9A</span></strong><strong><span style=3D"font-family:Calibri=
,sans-serif;color:black">[ippm]
 Second WGLC for draft-ietf-ippm-ioam-data</span></strong><u></u><u></u></p=
></div></div><div><div><p class=3D"MsoNormal">_____________________________=
__________________<br>ippm=C2=A0mailing=C2=A0list<br><a href=3D"mailto:ippm=
@ietf.org" target=3D"_blank">ippm@ietf.org</a><br><a href=3D"https://www.ie=
tf.org/mailman/listinfo/ippm" target=3D"_blank">https://www.ietf.org/mailma=
n/listinfo/ippm</a><br><br>Hi IPPM,<u></u><u></u></p><p class=3D"MsoNormal"=
>=C2=A0<u></u><u></u></p><div><p class=3D"MsoNormal">At our virtual interim=
 meeting, we decided to put=C2=A0draft-ietf-ippm-ioam-data through a second=
 last call, based on the new revisions, in mid-May. This email starts a two=
-week WGLC for this draft.<u></u><u></u></p></div><p class=3D"MsoNormal">=
=C2=A0<u></u><u></u></p><div><p class=3D"MsoNormal">The latest version can =
be found here:=C2=A0<a href=3D"https://tools.ietf.org/html/draft-ietf-ippm-=
ioam-data-09" target=3D"_blank">https://tools.ietf.org/html/draft-ietf-ippm=
-ioam-data-09</a><u></u><u></u></p></div><p class=3D"MsoNormal">=C2=A0<u></=
u><u></u></p><div><p class=3D"MsoNormal">This last call will end on <strong=
><span style=3D"font-family:Calibri,sans-serif">Thursday, May 28</span></st=
rong>. Please reply to<a href=3D"mailto:ippm@ietf.org" target=3D"_blank">ip=
pm@ietf.org</a> with your reviews and comments.<u></u><u></u></p></div><p c=
lass=3D"MsoNormal">=C2=A0<u></u><u></u></p><div><p class=3D"MsoNormal">Than=
ks,<u></u><u></u></p></div><div><p class=3D"MsoNormal">Tommy &amp; Ian<u></=
u><u></u></p></div></div></div></div></div></div></div><p>=C2=A0<u></u><u><=
/u></p></div></div></div></div></div></div></div></div><p><u></u>=C2=A0<u><=
/u></p></div></div></div></div></div></div></div></div></div><p><br></p></d=
iv>_______________________________________________<br>
ippm mailing list<br>
<a href=3D"mailto:ippm@ietf.org" target=3D"_blank">ippm@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/ippm" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/ippm</a><br>
</blockquote></div></div></div>

--000000000000059bc205a6e52ce6--


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From: "MORTON, ALFRED C (AL)" <acm@research.att.com>
To: Tommy Pauly <tpauly=40apple.com@dmarc.ietf.org>, IETF IPPM WG <ippm@ietf.org>, "draft-ietf-ippm-ioam-data@ietf.org" <draft-ietf-ippm-ioam-data@ietf.org>
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