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Date: Thu, 1 Oct 2015 09:59:26 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: "STARK, BARBARA H" <bs7652@att.com>
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Subject: Re: [ippm] metric registry parameter names
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On Wed, Sep 30, 2015 at 05:06:11PM +0000, STARK, BARBARA H wrote:
> > I think it would be desirable if parameters of metrics have well defined
> > names. In section 4.3.5 of draft-morton-ippm-initial-registry-00.txt I see:
> > 
> >    o  Upper limit on Poisson distribution (values above this limit will
> >       be clipped and set to the limit value). (if fixed, Upper limit =
> >       30 seconds.)
> > 
> > So what is the name of this option if I want to configure it?
> 
> I agree. The problem here is that the referenced specification is a bit vague wrt to certain "parameters", and the registry is being used as a means of tightening up the specification. I think that's fine, but what I would recommend is that the Reference Definition field include the name and definition of all parameters that are not explicitly named and defined in the referenced spec. I would rather the Fixed and Run-time Parameters simply provide a parsable list of parameters (and their values for Fixed Parameters), with names taken either directly from the referenced spec or from a list of additional parameters defined in the Reference Definition. 
> 
> In the Act_IP_UDP_Round-trip_Delay_Raw_95th-percentile_Poisson example, the Reference Definition would need to include text along the lines of...
> 
> The following parameters are defined and/or provided default values here:
> "upper_limit" is the upper time limit on Poisson distribution (values above this limit will be clipped and set to the limit value). Default is "upper_limit"="30 seconds".
> "seq_num" is an 8-byte field inside the payload of the test packet. The Src host shall set the initial value of seq_num in the payload of the first test packet and increment it by 1 with each subsequent test packet.
> "timestamp" is an 8 byte field inside the payload of the test packet. The Src host shall set the timestamp value in each test packet payload.
> 
> Both "seq_num" and "timestamp" need to be listed as Run-time Parameters, and not Fixed.
> 
> BTW, the lambda definition in the registry sample may be wrong. RFC 2681 defines lambda as "a rate in reciprocal seconds" and 1/lambda as a time interval between packets; but the sample registry entry defines 1/lambda as a rate (packets/second). I think perhaps the registry parameter needs to be lambda and not 1/lambda.
> 
> And since there seems to be a need to tighten RFC 2681 wrt default value of lambda, I recommend putting such default recommendations also in Reference Definition, with the other parameter definitions and defaults.
> Default "lambda"="1 packet/second" 
>

The quoting is perhaps helpful but still subtle. I would rather have
something like this (inspired by good old man pages):

The following parameters are defined and/or provided default values
here:

 upper-limit: The upper-limit defines the time limit on Poisson
              distribution (values above this limit will be clipped
              and set to the limit value). Default of the upper-limit
              is 30 seconds.

 seq-num:     The seq-num is an 8-byte field inside the payload of the
              test packet. The source host shall set the initial value
              of seq_num in the payload of the first test packet and
              increment it by 1 with each subsequent test packet.
   
 timestamp:   The timestamp is an 8 byte field inside the payload
              of the test packet. The source host shall set the
	      timestamp value in each test packet payload.

[...]

For automation, it would be nice to have a machine readable format
that might also indicate other aspects such as data type and units or
precision where they make sense. But a rendering such as shown above
makes it easy for developers to identify the set of options and to
lookup specific definitions.

PS: I personally prefer to not use underscores but dashes instead (the
    command line tools on Unix-like systems I am familiar with tend to
    use dashes instead of underscores).

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <http://www.jacobs-university.de/>


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From: "STARK, BARBARA H" <bs7652@att.com>
To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
Thread-Topic: [ippm] metric registry parameter names
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Subject: Re: [ippm] metric registry parameter names
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> The quoting is perhaps helpful but still subtle. I would rather have some=
thing
> like this (inspired by good old man pages):
>=20
> The following parameters are defined and/or provided default values
> here:
>=20
>  upper-limit: The upper-limit defines the time limit on Poisson
>               distribution (values above this limit will be clipped
>               and set to the limit value). Default of the upper-limit
>               is 30 seconds.
>=20
>  seq-num:     The seq-num is an 8-byte field inside the payload of the
>               test packet. The source host shall set the initial value
>               of seq_num in the payload of the first test packet and
>               increment it by 1 with each subsequent test packet.
>=20
>  timestamp:   The timestamp is an 8 byte field inside the payload
>               of the test packet. The source host shall set the
> 	      timestamp value in each test packet payload.

In the Reference Definition where additional parameters are defined, I thin=
k this makes sense. BTW, I've been thinking about the default for parameter=
s defined inside a registry entry, and think this probably does need to als=
o be provided in the Run-time Parameters field. I could envision different =
registry entries that reference the same RFC using different defaults for r=
egistry-defined parameters.

> [...]
>=20
> For automation, it would be nice to have a machine readable format that
> might also indicate other aspects such as data type and units or precisio=
n
> where they make sense. But a rendering such as shown above makes it easy
> for developers to identify the set of options and to lookup specific
> definitions.

I would like for Identifier, URI, Run-time Parameters, Fixed Parameters, an=
d some field under Output to be highly machine-readable/parsable. I was act=
ually wondering if we could just use JSON format for the parameter and outp=
ut fields that need to be parsable. My expectation is that a developer woul=
d be able to code a single executable for all registry entries with URI sta=
rting with "urn:ietf:params:performance:metric:Act_IP_UDP_Periodic-var_UDP-=
Payload-142_One-way_Delay" (see section 7 of draft-morton-ippm-initial-regi=
stry for this example). The Controller (or whatever configures the Controll=
er) could get the fixed and default parameter values from the registry entr=
y in order to set these in the MA (for a measurement task). In looking at t=
his particular example, that would also suggest that output-type (which can=
 be "raw" or "summary") and calculation (which can be "Percentile95", "Mean=
", "Min", "Max", or "Std_Dev") need to be provided either as Fixed Paramete=
rs or as Output Parameters defined in an Output category column.

> PS: I personally prefer to not use underscores but dashes instead (the
>     command line tools on Unix-like systems I am familiar with tend to
>     use dashes instead of underscores).

I'm not particular. As long as there are rules/conventions. I would prefer =
if we just pick some existing well-defined rules/conventions and point to t=
hem for the fields that need to be parsable. The other fields do also need =
conventions (like man pages) to make them easily human readable. I'll gladl=
y support any commonly-used convention.
Barbara


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Date: Thu, 1 Oct 2015 15:33:14 +0000 (UTC)
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Subject: [ippm] Request for Enhancement to IBM for : draft-ietf-ippm-6man-pdm-option-00
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IPPM,

As discussed in Prague, we are starting to make official requests to vendors of end hosts to implement the PDM Destination Options header.

The first may be viewed at: 
https://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=76515

You will need an IBM ID to view this enhancement request so I am giving the text of the RFE below for those who do not have such IDs.   The RFE was submitted by a large US insurance company.  


Description of RFE
------------------
The Performance and Diagnostics Metrics (PDM) IPv6 Destination Options (DO) Header is defined in :
http://datatracker.ietf.org/doc/draft-ietf-ippm-6man-pdm-option/

(This draft has been adopted by the IP Performance Metrics (IPPM) Working Group of the IETF.)

The PDM DO Header provides embedded performance and diagnostics in every packet for IPv6.    The IPID field, used as a de-facto sequence number in IPv4, is not available in IPv6. A sequence number provides invaluable information on packet loss and out-of-order packets.  Response time, from an end user point of view, has never been available.  The PDM header
restores a sequence number to IPv6 as well as providing true end-user based timing.

Such information can be provided even if IPSec ESP mode is being used.  Implementations on FreeBSD and Linux are underway.    A dissector for WireShark is also being written.  Please find attached screen shot of an IPSec packet with PDM.  (http://www.insidethestack.com/public/PDMOnESP.png)

The co-authors of this draft are happy to work with IBM on an implementation.

Use Cases:

1. Poor IPv6 network performance is seen for packets with encrypted data.  Information in the PDM Extension Header allows analysis of the performance of individual packets, and thus identification and location the source of the problem.  Without PDM, the data is inside the encryption, and thus simply unavailable to the network analyst.    The only option in that
situation is to spend enormous staff resources trying various guesses at the cause, in the hopes of happening across it.    Eventually.

2. An organization considering going to IPv6.  However, the loss of the IPID field will render most of their existing tools and techniques unworkable with IPv6.  As a result, implementation is delayed until forced.  At which point, it must be done on an emergency basis with minimal planning, and therefore errors in implementation.    Leading, in turn, to
months or years of attempting to correct these errors after the fact.  The time and resources thus required to overcome these errors is obvious.
 
 
Thanks,

Nalini Elkins
Inside Products, Inc.
www.insidethestack.com
(831) 659-8360


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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>, Vinayak Hegde <vinayakh@gmail.com>
Date: Thu, 1 Oct 2015 13:01:35 -0400
Thread-Topic: I-D Action: draft-morton-ippm-2330-stdform-typep-00.txt
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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: "STARK, BARBARA H" <bs7652@att.com>, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
Date: Thu, 1 Oct 2015 23:00:19 -0400
Thread-Topic: [ippm] metric registry parameter names
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Subject: Re: [ippm] metric registry parameter names
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Hi Barbara and Juergen,

I'm sorry to join in late (and at late hours). =20
Here's what I take away as additional considerations=20
or requirements for the registry format (which must be=20
reflected in the initial entries, of course):

Parameters (Fixed and Run-time) MUST have well defined names.
For Human readers, the hanging indent style will work, and the
names and definitions that do not appear in the Reference Method
Specification should appear in that column, with other additional
details.

Now, some other items (possibly) needing discussion/contribution:

The example, Act_IP_UDP_Round-trip_Delay_Raw_95th-percentile_Poisson,
includes requirements on the UDP Payload, that it contain a sequence
number, a time stamp, and padding. This aspect of the Fixed parameters
is a hold-over from our earliest examples and drafts. =20
I suggest:
 - noting that the Reference Method requires sequence numbers to=20
   establish packet correspondence.
 - noting that the chosen measurement protocol will dictate the format of=20
   sequence numbers and time-stamps, if they are conveyed in the packet.
 - providing the payload size in octets as a Fixed parameter.
The sequence numbers or timestamps are not Run-time parameters.
They must be determined by the measurement process itself after the
Fixed and Runtime parameters are passed to that process.

Also, in the Act_IP_UDP_Round-trip_Delay_Raw_95th-percentile_Poisson exampl=
e
(and others that were copied from this one, I somehow reversed the meaning =
of=20
lambda when attempting to provide a simple data format (NTP short format, 3=
2 bit),=20
I couldn't format lambda easily as a rate, so went for 1/lambda as a time
(and the corresponding edits were screwed-up =3D=3D thanks for catching tha=
t Barbara).

Default values for Run-time parameters: IPPM has never attempted to agree=20
on defaults, for 1/lambda, for example.  From the earliest comparisons (199=
8?),
RIPE and Advanced didn't use the same values for lambda.  Also, some Run-ti=
me
parameters (Source IP address) cannot have meaningful defaults.  So, I prop=
ose
that parameters are either Fixed (with values) or Run-time (no value).

Automation/Machine parsing: We discussed this in Dallas, and I listened to =
the=20
recording again last night. In the exchange between Marcelo and Barbara, I =
think=20
there was agreement (for someone) to propose a JSON format for Fixed Parame=
ters.
Today, Barbara expressed an interest in Index, URI, Fixed, Run-time, and so=
me field=20
under the Output category to be highly machine parse-able. =20
I'd like to be sure that some machine is actually going to read all this=20
material. We started the registry assuming that human implementers would=20
need to read the entries. If there's a use case where machines access
the registry themselves, whenever they need to, I'm interested to hear abou=
t it.
"I, for one, welcome our new computer overlords." ;-/

Last for this thread: Naming conventions, with word separation.
Please make some referenceable suggestions: I don't think we need/want
to create anything new.

Last^2: It was clear to me that Barbara did some extensive background
reading into IPPM's literature/RFCs. Welcome to IPPM, Barbara, you're one
of us now.

regards,
Al




> -----Original Message-----
> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of STARK, BARBARA H
> Sent: Thursday, October 01, 2015 11:30 AM
> To: Juergen Schoenwaelder
> Cc: ippm@ietf.org
> Subject: Re: [ippm] metric registry parameter names
>=20
> *** Security Advisory: This Message Originated Outside of AT&T ***.
> Reference http://cso.att.com/EmailSecurity/IDSP.html for more
> information.
>=20
> > The quoting is perhaps helpful but still subtle. I would rather have
> > something like this (inspired by good old man pages):
> >
> > The following parameters are defined and/or provided default values
> > here:
> >
> >  upper-limit: The upper-limit defines the time limit on Poisson
> >               distribution (values above this limit will be clipped
> >               and set to the limit value). Default of the upper-limit
> >               is 30 seconds.
> >
> >  seq-num:     The seq-num is an 8-byte field inside the payload of the
> >               test packet. The source host shall set the initial value
> >               of seq_num in the payload of the first test packet and
> >               increment it by 1 with each subsequent test packet.
> >
> >  timestamp:   The timestamp is an 8 byte field inside the payload
> >               of the test packet. The source host shall set the
> > 	      timestamp value in each test packet payload.
>=20
> In the Reference Definition where additional parameters are defined, I
> think this makes sense. BTW, I've been thinking about the default for
> parameters defined inside a registry entry, and think this probably does
> need to also be provided in the Run-time Parameters field. I could
> envision different registry entries that reference the same RFC using
> different defaults for registry-defined parameters.
>=20
> > [...]
> >
> > For automation, it would be nice to have a machine readable format
> > that might also indicate other aspects such as data type and units or
> > precision where they make sense. But a rendering such as shown above
> > makes it easy for developers to identify the set of options and to
> > lookup specific definitions.
>=20
> I would like for Identifier, URI, Run-time Parameters, Fixed Parameters,
> and some field under Output to be highly machine-readable/parsable. I
> was actually wondering if we could just use JSON format for the
> parameter and output fields that need to be parsable. My expectation is
> that a developer would be able to code a single executable for all
> registry entries with URI starting with
> "urn:ietf:params:performance:metric:Act_IP_UDP_Periodic-var_UDP-Payload-
> 142_One-way_Delay" (see section 7 of draft-morton-ippm-initial-registry
> for this example). The Controller (or whatever configures the
> Controller) could get the fixed and default parameter values from the
> registry entry in order to set these in the MA (for a measurement task).
> In looking at this particular example, that would also suggest that
> output-type (which can be "raw" or "summary") and calculation (which can
> be "Percentile95", "Mean", "Min", "Max", or "Std_Dev") need to be
> provided either as Fixed Parameters or as Output
>   Paramet
>  ers defined in an Output category column.
>=20
> > PS: I personally prefer to not use underscores but dashes instead (the
> >     command line tools on Unix-like systems I am familiar with tend to
> >     use dashes instead of underscores).
>=20
> I'm not particular. As long as there are rules/conventions. I would
> prefer if we just pick some existing well-defined rules/conventions and
> point to them for the fields that need to be parsable. The other fields
> do also need conventions (like man pages) to make them easily human
> readable. I'll gladly support any commonly-used convention.
> Barbara
>=20
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm


From nobody Fri Oct  2 09:14:36 2015
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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: "STARK, BARBARA H" <bs7652@att.com>, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>, "ippm@ietf.org" <ippm@ietf.org>
Date: Fri, 2 Oct 2015 12:14:30 -0400
Thread-Topic: [ippm] metric registry data formats
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Subject: Re: [ippm] metric registry data formats
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Hi Juergen and Barbara,

Let's try keep this thread on data formats, though I suppose the=20
machine-parse-able considerations are related.

When I wrote the examples with standard data formats, with
binary representations in many cases, I was considering these factors:

* the IETF IPPM protocols that (could) perform the measurements use
  the binary values=20
* the standard/binary representations convey many aspects of the=20
  format with exactness =3D=3D the units, the numerical resolution, etc.
* we have a "Large Scale" system to consider in LMAP, so many
  lightweight MAs and their associated measurement systems should=20
  be considered, in terms of control/reporting BW and data conversion load.

Perhaps there is a way to accommodate both binary and XML/JSON encoding.

Would it be too clumsy to define 2 or more format categories in the registr=
y entries,
and add a Run-time parameter to designate which of the categories will
be used?  We would still lean on the binary formats for units and resolutio=
n
and require equivalent representation in the alternate formats.

If we go this way, It would help if folks suggest the XML/JSON formats=20
they would like to use.

It strikes me as a bit funny that even where we specified binary formats,
folks want a different machine parse-able form instead.

regards,
Al


> -----Original Message-----
> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of STARK, BARBARA H
> Sent: Wednesday, September 30, 2015 10:15 AM
> To: Juergen Schoenwaelder; ippm@ietf.org
> Subject: Re: [ippm] metric registry data formats
>=20
> *** Security Advisory: This Message Originated Outside of AT&T ***.
> Reference http://cso.att.com/EmailSecurity/IDSP.html for more
> information.
>=20
> > the metrics registry seems to mandate data encoding. For example,
> > entries say that an IPv4 address is a 32 bit unsigned integer or that
> > a timestampe is to be represented as a specific NTP encoding. The
> > general assumption here seems to be that metric parameters (and
> > outputs) are encoded in binary formats. Given that LMAP intends to use
> > the metrics registry with protocols that use XML or JSON as their
> > encoding, it seems kind of odd to represent parameters in binary
> > (which essentially leads to base64 encoded values).
> >
> > My proposal would be that the metrics registry entries instead define
> > clearly what the parameters are and what the precision requirements
> > are but that they leave the encoding details to users of the registry.
> > I would also be fine if there are specific suggestions, e.g., for use
> > with YANG, the IP address parameters are represented as an ip-address
> > as defined in RFC 6991. Or anything in between is fine - I just would
> > dislike to configure parameters in binary base64 encoded values.
>=20
> I agree with Juergen that the data format (encoding) of run-time
> parameters does not need to be specified.
> My expectation of the registry entries for the Run-time Parameters
> column would be that the parameters listed use precisely the names of
> parameters from the referenced specification (which is what the example
> from
> https://www.ietf.org/proceedings/interim/2015/09/29/lmap/slides/slides-
> interim-2015-lmap-3-1.pdf mostly did). What's not clear to me is how
> these parameter names are delimited in the registry. In order for them
> to be machine parsable (which would be great), I really need to
> understand how they are delimited in the registry entry. I would think
> comma delimited would be good, with quotes around the names?
> "Src", "Dst", "T0", "Tf", "upper bound" [note that the upper bound,
> which the example has as "Upper limit on Poisson distribution" is
> problematic because the reference (RFC2681) only loosely describes this
> concept and does not list it as a parameter]
>=20
> I'm even more concerned with the format of registry entries that would
> be very useful if they were machine-parsable, such as Fixed Parameters.
> The example of fixed parameters that was on slide 9 of
> https://www.ietf.org/proceedings/interim/2015/09/29/lmap/slides/slides-
> interim-2015-lmap-3-1.pdf is very unparsable. Something like
> "IPv4.dscp"=3D"0", "IPv4.ttl"=3D"255", "IPv4.protocol"=3D"17", "Tmax"=3D"=
3
> seconds", "payload.length"=3D"16 octets"
> [I was going to put the other elements listed as fixed parameters on
> that slide, but got really confused as to how a locally generated (at
> run-time?) checksum, sequence number, and timestamp were "fixed"
> parameters -- really what these seem to be are attempts to specify
> unspecified portions of the reference that hint at the need to include
> timestamp and sequence number in the payload, which is awkward.] But
> something like this means there would need to be a list of these sorts
> of fixed parameter names and how to express them. I would be tempted to
> use something like Wireshark names for protocol components.
> Barbara
>=20
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm


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This draft got posted on the ippm mailing list but has got few reads, =
possibly because of lack of YANG experts on that list. Cross posting it =
here to see if more YANG experts could review the document/YANG model.

The draft is well written (I know I am biased), with both a UML =
information model, complete with descriptions and a corresponding data =
model, also with a complete set of descriptions. Because of that the =
number of pages look bigger than usual, but one can choose to read the =
description in either the UML version or the YANG version.

Thanks.


> Begin forwarded message:
>=20
> A new version of I-D, draft-cmzrjp-ippm-twamp-yang-01.txt
> has been successfully submitted by Kostas Pentikousis and posted to =
the
> IETF repository.
>=20
> Name:		draft-cmzrjp-ippm-twamp-yang
> Revision:	00
> Title:		Two-Way Active Measurement Protocol (TWAMP) Data =
Model
> Document date:	2015-07-03
> Group:		Individual Submission
> Pages:		56
> URL:            =
https://tools.ietf.org/id/draft-cmzrjp-ippm-twamp-yang-01.txt =
<https://tools.ietf.org/id/draft-cmzrjp-ippm-twamp-yang-01.txt>Status:   =
      https://datatracker.ietf.org/doc/draft-cmzrjp-ippm-twamp-yang/ =
<https://datatracker.ietf.org/doc/draft-cmzrjp-ippm-twamp-yang/>Htmlized: =
      https://tools.ietf.org/html/draft-cmzrjp-ippm-twamp-yang-01 =
<https://tools.ietf.org/html/draft-cmzrjp-ippm-twamp-yang-01>
>=20
> Abstract:
>   This document specifies a data model for client and server
>   implementations of the Two-Way Active Measurement Protocol (TWAMP).
>   We define the TWAMP data model through Unified Modeling Language
>   (UML) class diagrams and formally specify it using YANG.
>=20
>=20
>=20
>=20
> Please note that it may take a couple of minutes from the time of =
submission
> until the htmlized version and diff are available at tools.ietf.org.
>=20
> The IETF Secretariat
>=20

Mahesh Jethanandani
mjethanandani@gmail.com




--Apple-Mail=_63BE719D-09BC-4918-8A99-C3273794A876
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">This draft got posted on the ippm mailing list but has got =
few reads, possibly because of lack of YANG experts on that list. Cross =
posting it here to see if more YANG experts could review the =
document/YANG model.<div class=3D""><br class=3D""></div><div =
class=3D"">The draft is well written (I know I am biased), with both a =
UML information model, complete with descriptions and a corresponding =
data model, also with a complete set of descriptions. Because of that =
the number of pages look bigger than usual, but one can choose to read =
the description in either the UML version or the YANG version.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Thanks.</div><div =
class=3D""><br class=3D""><div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D"">Begin forwarded message:</div><div =
class=3D""><br class=3D"">A new version of I-D, =
draft-cmzrjp-ippm-twamp-yang-01.txt<br class=3D"">has been successfully =
submitted by Kostas Pentikousis and posted to the<br class=3D"">IETF =
repository.<br class=3D""><br class=3D"">Name:<span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	</span><span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>draft-cmzrjp-ippm-twamp-yang<br class=3D"">Revision:<span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	</span>00<br =
class=3D"">Title:<span class=3D"Apple-tab-span" style=3D"white-space:pre">=
	</span><span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>Two-Way Active Measurement Protocol (TWAMP) Data Model<br =
class=3D"">Document date:<span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span>2015-07-03<br =
class=3D"">Group:<span class=3D"Apple-tab-span" style=3D"white-space:pre">=
	</span><span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>Individual Submission<br class=3D"">Pages:<span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	</span><span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	</span>56<br =
class=3D"">URL: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<a =
href=3D"https://tools.ietf.org/id/draft-cmzrjp-ippm-twamp-yang-01.txt" =
class=3D"">https://tools.ietf.org/id/draft-cmzrjp-ippm-twamp-yang-01.txt</=
a></div></blockquote><blockquote type=3D"cite" class=3D""><div =
class=3D"">Status: &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<a =
href=3D"https://datatracker.ietf.org/doc/draft-cmzrjp-ippm-twamp-yang/" =
class=3D"">https://datatracker.ietf.org/doc/draft-cmzrjp-ippm-twamp-yang/<=
/a></div></blockquote><blockquote type=3D"cite" class=3D""><div =
class=3D"">Htmlized: &nbsp; &nbsp; &nbsp;&nbsp;<a =
href=3D"https://tools.ietf.org/html/draft-cmzrjp-ippm-twamp-yang-01" =
class=3D"">https://tools.ietf.org/html/draft-cmzrjp-ippm-twamp-yang-01</a>=
</div></blockquote><blockquote type=3D"cite" class=3D""><div =
class=3D""><br class=3D""><br class=3D"">Abstract:<br class=3D""> =
&nbsp;&nbsp;This document specifies a data model for client and =
server<br class=3D""> &nbsp;&nbsp;implementations of the Two-Way Active =
Measurement Protocol (TWAMP).<br class=3D""> &nbsp;&nbsp;We define the =
TWAMP data model through Unified Modeling Language<br class=3D""> =
&nbsp;&nbsp;(UML) class diagrams and formally specify it using YANG.<br =
class=3D""><br class=3D""><br class=3D""><br class=3D""><br =
class=3D"">Please note that it may take a couple of minutes from the =
time of submission<br class=3D"">until the htmlized version and diff are =
available at <a href=3D"http://tools.ietf.org" =
class=3D"">tools.ietf.org</a>.<br class=3D""><br class=3D"">The IETF =
Secretariat<br class=3D""><br class=3D""></div></blockquote></div><br =
class=3D""><div apple-content-edited=3D"true" class=3D"">
<div class=3D"">Mahesh Jethanandani</div><div class=3D""><a =
href=3D"mailto:mjethanandani@gmail.com" =
class=3D"">mjethanandani@gmail.com</a></div><div class=3D""><br =
class=3D""></div><br class=3D"Apple-interchange-newline">

</div>
<br class=3D""></div></body></html>=

--Apple-Mail=_63BE719D-09BC-4918-8A99-C3273794A876--


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Greeting IPPM participants,

As the IPPM meeting at IETF 94 in Yokohama, Japan rapidly approaches, we =
need to define the meeting=E2=80=99s agenda. Please send your requests =
for agenda slots to ippm-chairs@tools.ietf.org, by Friday, October 10, =
2015.

Note that the preliminary IETF 94 agenda indicates that the meeting will =
be on Tuesday, November 3, 2015 from 13:00-15:00 local time in Yokohama, =
Japan (04:00-06:00 UTC).

Thanks,

Bill Cerveny
IPPM Co-chair=


From nobody Sun Oct  4 19:35:32 2015
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To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, Vinayak Hegde <vinayakh@gmail.com>
References: <20150806173131.2839.2258.idtracker@ietfa.amsl.com> <55CFE8CC.2020405@gmail.com> <CAKe6YvP0dMb2Etz5C0NvBLnA75zo0=mOKMKoCSJmHps-jTb=8Q@mail.gmail.com> <55D0EDAA.3010101@gmail.com> <4AF73AA205019A4C8A1DDD32C034631D0BB4842C91@NJFPSRVEXG0.research.att.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Cc: "draft-morton-ippm-2330-stdform-typep.all@ietf.org" <draft-morton-ippm-2330-stdform-typep.all@ietf.org>, "ippm@ietf.org" <ippm@ietf.org>
Subject: Re: [ippm] I-D Action: draft-morton-ippm-2330-stdform-typep-00.txt
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Yes, that looks very clear to me, thanks.

Regards
   Brian

On 02/10/2015 06:01, MORTON, ALFRED C (AL) wrote:
> Hi Brian,
> 
> Thanks for your comments! Vin has proposed text to address them,
> and the co-authors adopted this caveat and other improvements 
> in the text of version 01:
> https://tools.ietf.org/html/draft-morton-ippm-2330-stdform-typep-01
> 
> Further review and comments are welcome, of course.
> 
> regards,
> Al
> for the co-authors
> 
>> -----Original Message-----
>> From: Brian E Carpenter [mailto:brian.e.carpenter@gmail.com]
>> Sent: Sunday, August 16, 2015 4:08 PM
>> To: Vinayak Hegde
>> Cc: draft-morton-ippm-2330-stdform-typep.all@ietf.org; Fred Baker
>> Subject: Re: I-D Action: draft-morton-ippm-2330-stdform-typep-00.txt
>>
>> Hi Vinayak,
>>
>> I think a caveat should be enough. There is a possibility that stateful
>> NAT will lead to unstable performance within a flow, since state needs
>> to be created for the first packet of a flow, and may be lost later if
>> the NAT runs out of resources. However, that doesn't invalidate the
>> Type-P.
>>
>> Of course, NAT does mean that the "signature" of Type-P will change
>> between the source and the destination. That can be annoying if you want
>> to correlate measurements between the two ends of a path.
>>
>> Regards
>>    Brian
>>
>>
>> On 17/08/2015 06:58, Vinayak Hegde wrote:
>>> Hi Brian,
>>>
>>> I looked at the draft that you linked. It recommends against the use
>>> of NAT in IPv6 :) and also is stateless.
>>>
>>> Using NAT can have unpredictable impact on the measurement
>>> (unpredictable as in the amount of additional time added) but it is
>>> not always possible to control this parameter (as you may not have any
>>> control on the underlying network or middleboxes). But this is
>>> something that people who do measurements should be aware of. Do you
>>> think adding this caveat in draft should suffice or did you have
>>> anything else in mind ?
>>>
>>> Thanks
>>> Vinayak
>>>
>>> On Sun, Aug 16, 2015 at 7:05 AM, Brian E Carpenter
>>> <brian.e.carpenter@gmail.com> wrote:
>>>> Thanks for doing this. It's the biggest reaction I ever got to a
>>>> Gen-ART review comment ;-).
>>>>
>>>> It looks good to me. One thing I noticed is that neither this draft
>>>> nor 2330 mentions NAT. (In fact NPTv6 [RFC 6296] is more relevant for
>>>> IPv6). I don't think address translation would invalidate a Type-P
>>>> but maybe this should be stated to avoid doubt?
>>>>
>>>>    Brian
>>>>
>>>> On 07/08/2015 05:31, internet-drafts@ietf.org wrote:
>>>>>
>>>>> A New Internet-Draft is available from the on-line Internet-Drafts
>> directories.
>>>>>
>>>>>
>>>>>         Title           : Updates for IPPM's Active Metric
>> Framework: Packets of Type-P and Standard-Formed Packets
>>>>>         Authors         : Al Morton
>>>>>                           Joachim Fabini
>>>>>                           Nalini Elkins
>>>>>                           Michael S. Ackermann
>>>>>                           Vinayak Hegde
>>>>>       Filename        : draft-morton-ippm-2330-stdform-typep-00.txt
>>>>>       Pages           : 10
>>>>>       Date            : 2015-08-06
>>>>>
>>>>> Abstract:
>>>>>    This memo updates the IP Performance Metrics (IPPM) Framework RFC
>>>>>    2330 with new considerations for measurement methodology and
>> testing.
>>>>>    The memo updates the definition of standard-formed packets in RFC
>>>>>    2330 to include IPv6 packets.  It also augments distinguishing
>>>>>    aspects of packets, referred to as Type-P for test packets in RFC
>>>>>    2330.
>>>>>
>>>>>    Two points (at least) are worthwhile discussing further: extent
>> of
>>>>>    coverage for 6LO and IPv6 Header Compression, and the continued
>> need
>>>>>    to define a "minimal standard-formed packet".
>>>>>
>>>>>
>>>>>
>>>>> The IETF datatracker status page for this draft is:
>>>>> https://datatracker.ietf.org/doc/draft-morton-ippm-2330-stdform-type
>>>>> p/
>>>>>
>>>>> There's also a htmlized version available at:
>>>>> https://tools.ietf.org/html/draft-morton-ippm-2330-stdform-typep-00
>>>>>
>>>>>
>>>>> Please note that it may take a couple of minutes from the time of
>>>>> submission until the htmlized version and diff are available at
>> tools.ietf.org.
>>>>>
>>>>> Internet-Drafts are also available by anonymous FTP at:
>>>>> ftp://ftp.ietf.org/internet-drafts/
>>>>>
>>>>> _______________________________________________
>>>>> I-D-Announce mailing list
>>>>> I-D-Announce@ietf.org
>>>>> https://www.ietf.org/mailman/listinfo/i-d-announce
>>>>> Internet-Draft directories: http://www.ietf.org/shadow.html or
>>>>> ftp://ftp.ietf.org/ietf/1shadow-sites.txt
>>>>>
>>>


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Date: Mon, 5 Oct 2015 16:32:02 +0000 (UTC)
From: <nalini.elkins@insidethestack.com>
To: "ippm-chairs@tools.ietf.org Chairs (ippm-chairs@tools.ietf.org)" <ippm-chairs@tools.ietf.org>, "ippm@ietf.org" <ippm@ietf.org>
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Subject: Re: [ippm] Call for agenda items
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Bill,

We would like some time for our :

http://datatracker.ietf.org/doc/draft-ietf-ippm-6man-pdm-option/

I will have updates to the draft done in a day or two.  We are meeting with=
 IBM development on implementation on their platform(s) & will give an upda=
te from what they say as well as our testing.
=20
Thanks,

Nalini Elkins
Inside Products, Inc.
www.insidethestack.com
(831) 659-8360


________________________________
From: Bill Cerveny <ietf@wjcerveny.com>
To: ippm@ietf.org=20
Sent: Sunday, October 4, 2015 7:31 PM
Subject: [ippm] Call for agenda items


Greeting IPPM participants,

As the IPPM meeting at IETF 94 in Yokohama, Japan rapidly approaches, we ne=
ed to define the meeting=E2=80=99s agenda. Please send your requests for ag=
enda slots to ippm-chairs@tools.ietf.org, by Friday, October 10, 2015.

Note that the preliminary IETF 94 agenda indicates that the meeting will be=
 on Tuesday, November 3, 2015 from 13:00-15:00 local time in Yokohama, Japa=
n (04:00-06:00 UTC).

Thanks,

Bill Cerveny
IPPM Co-chair
_______________________________________________
ippm mailing list
ippm@ietf.org
https://www.ietf.org/mailman/listinfo/ippm


From nobody Mon Oct  5 21:24:58 2015
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To: Brian Haberman <brian@innovationslab.net>
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Subject: Re: [ippm] Brian Haberman's Discuss on draft-ietf-ippm-ipsec-09: (with DISCUSS)
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--001a1147830ca990680521680286
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Hi, Brian,

On Mon, Apr 6, 2015 at 7:54 AM, Brian Haberman <brian@innovationslab.net>
wrote:

> Brian Haberman has entered the following ballot position for
> draft-ietf-ippm-ipsec-09: Discuss
>
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut this
> introductory paragraph, however.)
>
>
> Please refer to http://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
>
>
> The document, along with other ballot positions, can be found here:
> http://datatracker.ietf.org/doc/draft-ietf-ippm-ipsec/
>
>
>
> ----------------------------------------------------------------------
> DISCUSS:
> ----------------------------------------------------------------------
>
> I hope this is a short discussion and I can change my ballot to a Yes...
>
> The applicability section says "Until an IANA registry for OWAMP Mode
> values is established, the use this feature in OWAMP implementations MUST
> be arranged privately among consenting OWAMP users."
>
> Is there an issue with this document creating that registry?  Or, if
> separation is needed, a companion document spun quickly to create this
> registry?  The functionality specified here seems quite applicable to
> OWAMP and requiring private agreements to use it seems sub-optimal.
>

The companion document we discussed (draft-ietf-ippm-owamp-registry) is now
on the IESG telechat agenda for 10-15-2015. Would you like to clear this
Discuss now, or wait until after draft-ietf-ippm-owamp-registry is approved?

Thanks,

Spencer

--001a1147830ca990680521680286
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<div dir=3D"ltr">Hi, Brian,<div class=3D"gmail_extra"><br><div class=3D"gma=
il_quote">On Mon, Apr 6, 2015 at 7:54 AM, Brian Haberman <span dir=3D"ltr">=
&lt;<a href=3D"mailto:brian@innovationslab.net" target=3D"_blank">brian@inn=
ovationslab.net</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" =
style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:r=
gb(204,204,204);border-left-style:solid;padding-left:1ex">Brian Haberman ha=
s entered the following ballot position for<br>
draft-ietf-ippm-ipsec-09: Discuss<br>
<br>
When responding, please keep the subject line intact and reply to all<br>
email addresses included in the To and CC lines. (Feel free to cut this<br>
introductory paragraph, however.)<br>
<br>
<br>
Please refer to <a href=3D"http://www.ietf.org/iesg/statement/discuss-crite=
ria.html" rel=3D"noreferrer" target=3D"_blank">http://www.ietf.org/iesg/sta=
tement/discuss-criteria.html</a><br>
for more information about IESG DISCUSS and COMMENT positions.<br>
<br>
<br>
The document, along with other ballot positions, can be found here:<br>
<a href=3D"http://datatracker.ietf.org/doc/draft-ietf-ippm-ipsec/" rel=3D"n=
oreferrer" target=3D"_blank">http://datatracker.ietf.org/doc/draft-ietf-ipp=
m-ipsec/</a><br>
<br>
<br>
<br>
----------------------------------------------------------------------<br>
DISCUSS:<br>
----------------------------------------------------------------------<br>
<br>
I hope this is a short discussion and I can change my ballot to a Yes...<br=
>
<br>
The applicability section says &quot;Until an IANA registry for OWAMP Mode<=
br>
values is established, the use this feature in OWAMP implementations MUST<b=
r>
be arranged privately among consenting OWAMP users.&quot;<br>
<br>
Is there an issue with this document creating that registry?=C2=A0 Or, if<b=
r>
separation is needed, a companion document spun quickly to create this<br>
registry?=C2=A0 The functionality specified here seems quite applicable to<=
br>
OWAMP and requiring private agreements to use it seems sub-optimal.<br></bl=
ockquote><div><br></div><div>The companion document we discussed (draft-iet=
f-ippm-owamp-registry) is now on the IESG telechat agenda for 10-15-2015. W=
ould you like to clear this Discuss now, or wait until after draft-ietf-ipp=
m-owamp-registry is approved?</div><div><br></div><div>Thanks,</div><div><b=
r></div><div>Spencer=C2=A0</div></div></div></div>

--001a1147830ca990680521680286--


From nobody Mon Oct  5 21:27:21 2015
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Subject: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-ipsec-11: (with COMMENT)
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Spencer Dawkins has entered the following ballot position for
draft-ietf-ippm-ipsec-11: Yes

When responding, please keep the subject line intact and reply to all
email addresses included in the To and CC lines. (Feel free to cut this
introductory paragraph, however.)


Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
for more information about IESG DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-ippm-ipsec/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

I'm clearing my Discuss-for-IANA, now that draft-ietf-ippm-owamp-registry
is on the next telechat agenda.



From nobody Tue Oct  6 05:40:56 2015
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From: Brian Haberman <brian@innovationslab.net>
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Hi Spencer,

On 10/6/15 12:24 AM, Spencer Dawkins at IETF wrote:
> Hi, Brian,
>=20
> On Mon, Apr 6, 2015 at 7:54 AM, Brian Haberman <brian@innovationslab.ne=
t>
> wrote:
>=20
>> Brian Haberman has entered the following ballot position for
>> draft-ietf-ippm-ipsec-09: Discuss
>>
>> When responding, please keep the subject line intact and reply to all
>> email addresses included in the To and CC lines. (Feel free to cut thi=
s
>> introductory paragraph, however.)
>>
>>
>> Please refer to http://www.ietf.org/iesg/statement/discuss-criteria.ht=
ml
>> for more information about IESG DISCUSS and COMMENT positions.
>>
>>
>> The document, along with other ballot positions, can be found here:
>> http://datatracker.ietf.org/doc/draft-ietf-ippm-ipsec/
>>
>>
>>
>> ----------------------------------------------------------------------=

>> DISCUSS:
>> ----------------------------------------------------------------------=

>>
>> I hope this is a short discussion and I can change my ballot to a Yes.=
=2E.
>>
>> The applicability section says "Until an IANA registry for OWAMP Mode
>> values is established, the use this feature in OWAMP implementations M=
UST
>> be arranged privately among consenting OWAMP users."
>>
>> Is there an issue with this document creating that registry?  Or, if
>> separation is needed, a companion document spun quickly to create this=

>> registry?  The functionality specified here seems quite applicable to
>> OWAMP and requiring private agreements to use it seems sub-optimal.
>>
>=20
> The companion document we discussed (draft-ietf-ippm-owamp-registry) is=
 now
> on the IESG telechat agenda for 10-15-2015. Would you like to clear thi=
s
> Discuss now, or wait until after draft-ietf-ippm-owamp-registry is appr=
oved?

The Reference dependencies will take care of the ordering here, so I
will clear.  Thanks to all for the effort on this!

Regards,
Brian



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From nobody Tue Oct  6 08:02:08 2015
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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: "Brian Trammell (ietf@trammell.ch)" <ietf@trammell.ch>, "Bill Cerveny (ietf@wjcerveny.com)" <ietf@wjcerveny.com>, "ippm@ietf.org" <ippm@ietf.org>
Date: Tue, 6 Oct 2015 11:02:00 -0400
Thread-Topic: Proposed Change of Intended Status: draft-ietf-checksum-trailer
Thread-Index: AdEAR2eg3dzZ6mgBSiuy1eaxHJ1XZA==
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Subject: [ippm] Proposed Change of Intended Status: draft-ietf-checksum-trailer
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IPPM,

In my role as Doc Shepherd for=20
https://tools.ietf.org/html/draft-ietf-ippm-checksum-trailer-02
here's the status as I know it.

We had notification of IPR on this draft to IPPM list in August:
no one replied, and I mentioned this in an
revision of the Shepherd's form (in September).

Subsequently, the NTP working Group reviewed a similar=20
checksum feature for NTP whose document status was Experimental.
It has been proposed that theses related drafts proceed
to IESG with the *same* Intended Status.=20

**ACTION**
This message opens another comment period to
ask the WG if there is any concern with a change of=20
draft-ietf-checksum-trailer status to Experimental
from Informational.  Brian Haberman clarified that we do not
need to re-do Last Call if we make this change,=20
as Experimental and Informational are considered the
same level.

Please send any comments regarding this Intended Status change=20
to the ippm-list, by October 13, 2015.

thanks and regards,
Al



From nobody Tue Oct  6 09:35:14 2015
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Subject: [ippm] Protocol Action: 'IKEv2-derived Shared Secret Key for O/TWAMP' to Proposed Standard (draft-ietf-ippm-ipsec-11.txt)
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The IESG has approved the following document:
- 'IKEv2-derived Shared Secret Key for O/TWAMP'
  (draft-ietf-ippm-ipsec-11.txt) as Proposed Standard

This document is the product of the IP Performance Metrics Working Group.

The IESG contact persons are Spencer Dawkins and Martin Stiemerling.

A URL of this Internet Draft is:
https://datatracker.ietf.org/doc/draft-ietf-ippm-ipsec/





Technical Summary

   The One-way Active Measurement Protocol (OWAMP) and Two-Way Active
   Measurement Protocol (TWAMP) security mechanism require that both the
   client and server endpoints possess a shared secret.  Since the
   currently-standardized O/TWAMP security mechanism only supports a
   pre-shared key mode, large scale deployment of O/TWAMP is hindered
   significantly.  At the same time, recent trends point to wider
   Internet Key Exchange Protocol Version 2 (IKEv2) deployment which, in
   turn, calls for mechanisms and methods that enable tunnel end-users,
   as well as operators, to measure one-way and two- way network
   performance in a standardized manner.  This document describes the
   use of keys derived from an IKEv2 security association (SA) as the
   shared key in O/TWAMP.  If the shared key can be derived from the
   IKEv2 SA, O/TWAMP can support certificate-based key exchange, which
   would allow for more operational flexibility and efficiency.  The key
   derivation presented in this document can also facilitate automatic
   key management.

Working Group Summary

   The document was discussed extensively within the IPPM WG, 
    and has gone through two WGLCs. There was no significant 
    controversy during the discussion of the document -- the main 
    points of discussion had to do with the details of how to implement 
    the binding between O/TWAMP and IPsec and whether the packet 
    format used needed to be backward-compatible with non-IPsec 
    O/TWAMP. The document has consensus to go forward.

Document Quality

    As the document "glues" O/TWAMP to IPsec, it required review 
    from both communities The document has had less comment 
    from the IPsec WG than from the IPPM WG, but comments from 
    IPsec were addressed.

Personnel

    Brian Trammell is the document shepherd. 
    Spencer Dawkins is the responsible AD.



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Subject: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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Greetings, all,

WG last call on draft-ietf-ippm-active-passive-01 begins today, and will =
end Wednesday 21 October 2015. Please send any comments (including "I've =
read it and it's good" :) ) to the ippm@ietf.org list.

Thanks, cheers,

Brian (chair hat)

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From nobody Wed Oct  7 06:57:36 2015
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Subject: [ippm] Last Call: <draft-ietf-ippm-type-p-monitor-02.txt> (Differentiated Service Code Point and Explicit Congestion Notification Monitoring in Two-Way Active Measurement Protocol (TWAMP)) to Proposed Standard
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The IESG has received a request from the IP Performance Metrics WG (ippm)
to consider the following document:
- 'Differentiated Service Code Point and Explicit Congestion Notification
   Monitoring in Two-Way Active Measurement Protocol (TWAMP)'
  <draft-ietf-ippm-type-p-monitor-02.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits
final comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2015-10-21. Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the
beginning of the Subject line to allow automated sorting.

Abstract


   This document describes an OPTIONAL extension for Two-Way Active
   Measurement Protocol (TWAMP) allowing the monitoring of the
   Differentiated Service Code Point and Explicit Congestion
   Notification fields with the TWAMP-Test protocol.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-ippm-type-p-monitor/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-ippm-type-p-monitor/ballot/


No IPR declarations have been submitted directly on this I-D.



From nobody Wed Oct  7 19:54:05 2015
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Folks-

In case anyone is has some cool measurement work that needs a home,
I wanted to mention that papers will soon be due for a special issue
of IEEE Internet Computing on the topic of 'Measuring the Internet'.
Papers are due Oct 30.  All the info is at the following URL:

http://www.computer.org/web/computingnow/iccfp4

allman


--
http://www.icir.org/mallman/





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From nobody Wed Oct  7 23:58:30 2015
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From: Ionta Tiziano <tiziano.ionta@telecomitalia.it>
To: 'Brian Trammell' <ietf@trammell.ch>, "'ippm@ietf.org'" <ippm@ietf.org>
Thread-Topic: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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Hi
I've read the document and I agree with the contents.
Best
Tiziano Ionta

-----Messaggio originale-----
Da: ippm [mailto:ippm-bounces@ietf.org] Per conto di Brian Trammell
Inviato: mercoled=EC 7 ottobre 2015 12.47
A: ippm@ietf.org
Oggetto: [ippm] WGLC on draft-ietf-ippm-active-passive-01

Greetings, all,

WG last call on draft-ietf-ippm-active-passive-01 begins today, and will en=
d Wednesday 21 October 2015. Please send any comments (including "I've read=
 it and it's good" :) ) to the ippm@ietf.org list.

Thanks, cheers,

Brian (chair hat)

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 =
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der by return e-mail, Thanks.


From nobody Sat Oct 10 12:03:05 2015
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Subject: [ippm] I-D Action: draft-ietf-ippm-6man-pdm-option-01.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the IP Performance Metrics Working Group of the IETF.

        Title           : IPv6 Performance and Diagnostic Metrics (PDM) Destination Option
        Authors         : Nalini Elkins
                          Robert Hamilton
                          Michael S. Ackermann
	Filename        : draft-ietf-ippm-6man-pdm-option-01.txt
	Pages           : 28
	Date            : 2015-10-10

Abstract:
   To assess performance problems,  measurements based on optional
   sequence numbers and timing may be embedded in each packet.  Such
   measurements may be interpreted in real-time or after the fact. An
   implementation of the existing IPv6 Destination Options extension
   header, the Performance and Diagnostic Metrics (PDM) Destination
   Options extension header as well as the field limits, calculations,
   and usage of the PDM in measurement are included in this document.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ippm-6man-pdm-option/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-ippm-6man-pdm-option-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ippm-6man-pdm-option-01


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

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


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From: <nalini.elkins@insidethestack.com>
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IPPM,

We have added two new sections to address the comments from the WG session in Prague:

1.  Comment:  Indicate that PDM will not work when using IPv6 transition technologies

Action: Section 1.6 IPv6 Transition Technologies added.


2.  Comment: Indicate that PDM must be placed BEFORE the ESP header.


Action:  Section 3.3 "Header Placement" revised.   New section 3.4 "Header Placement Using IPSec ESP Mode" added to further clarify header placement.

Thanks,

Nalini Elkins
Inside Products, Inc.
www.insidethestack.com
(831) 659-8360

----- Forwarded Message -----
From: "internet-drafts@ietf.org" <internet-drafts@ietf.org>
To: i-d-announce@ietf.org 
Cc: ippm@ietf.org 
Sent: Saturday, October 10, 2015 12:03 PM
Subject: [ippm] I-D Action: draft-ietf-ippm-6man-pdm-option-01.txt



A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the IP Performance Metrics Working Group of the IETF.

        Title           : IPv6 Performance and Diagnostic Metrics (PDM) Destination Option
        Authors         : Nalini Elkins
                          Robert Hamilton
                          Michael S. Ackermann
    Filename        : draft-ietf-ippm-6man-pdm-option-01.txt
    Pages           : 28
    Date            : 2015-10-10

Abstract:
   To assess performance problems,  measurements based on optional
   sequence numbers and timing may be embedded in each packet.  Such
   measurements may be interpreted in real-time or after the fact. An
   implementation of the existing IPv6 Destination Options extension
   header, the Performance and Diagnostic Metrics (PDM) Destination
   Options extension header as well as the field limits, calculations,
   and usage of the PDM in measurement are included in this document.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ippm-6man-pdm-option/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-ippm-6man-pdm-option-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ippm-6man-pdm-option-01


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

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

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


From nobody Mon Oct 12 00:08:03 2015
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To: ippm@ietf.org, "Barbara.Stark@bellsouth.com" <Barbara.Stark@bellsouth.com>, Al Morton <acmorton@att.com>, "EARDLEY, Phil" <philip.eardley@bt.com>, Benoit Claise <bclaise@cisco.com>
References: <2D09D61DDFA73D4C884805CC7865E61132A79DC6@GAALPA1MSGUSRBF.ITServices.sbc.com> <4AF73AA205019A4C8A1DDD32C034631D0BB458122D@NJFPSRVEXG0.research.att.com> <2D09D61DDFA73D4C884805CC7865E6113A9FFAA0@GAALPA1MSGUSRBF.ITServices.sbc.com> <4AF73AA205019A4C8A1DDD32C034631D0BB4581540@NJFPSRVEXG0.research.att.com> <2D09D61DDFA73D4C884805CC7865E6113AA06396@GAALPA1MSGUSRBF.ITServices.sbc.com>
From: marcelo bagnulo braun <marcelo@it.uc3m.es>
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Date: Mon, 12 Oct 2015 09:07:48 +0200
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Subject: [ippm] Changes in the registry document (was Re: review of draft-ietf-ippm-metric-registry-03
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The proposed changes to address these comments are:

The abstract now reads:

- This document defines the format for the Performance Metrics registry 
and defines the IANA Registry for Performance Metrics.

The introduction now reads:

- This document therefore requests that IANA create and maintain a
Performance Metrics Registry, according to the maintenance procedures
and the Performance Metrics Registry format defined in this memo.
Although the Registry format is primarily for use by IANA, any other
organization that wishes to create a Performance Metrics Registry MAY
use the format for its purposes. The authors make no guarantee of the
format's applicability to any possible set of Performance Metrics
envisaged by other organizations. In the rest of this document, unless
we explicitly say so, we will refer to the IANA-maintained Performance
Metrics Registry as simply the Performance Metrics Registry.

The scope section now reads:
- This document is meant mainly for two different audiences.  For those
defining new Registered Performance Metrics, it provides specifications and
best practices to be used in deciding which Registered Performance 
Metrics are
useful for a measurement study, instructions for
writing the text for each column of the Registered Performance Metrics, and
information on the supporting documentation required for the new
Performance Metrics Registry entry (up to and including the publication 
of one or more
RFCs or I-Ds describing it).  For the appointed Performance Metrics 
Experts and
for IANA personnel administering the new IANA Performance Metric
Registry, it defines a set of acceptance criteria
against which these proposed Registered Performance Metrics should be
evaluated. In addition, this document may be useful for other 
organization who
are defining a Performance Metric registry
of its own, who can rely on the Performance Metric registry defined in 
this document.

Note that the Introduction doenst mention LMAP at all, so the last item 
would fit in the introduction, so I added the following text in the 
Interoperability section which actually talks about LMAP:
- It should be noted that the LMAP framework explicitly allows for using 
not only the IANA-maintained Performance Metrics Registry but also other 
registries containing Performance Metrics, either defined by other 
organizations or private ones. However, others who are creating 
Registries to be used in the context of an LMAP framework are encouraged 
to use the Registry format defined in this document, because this makes 
it easier for developers of LMAP Measurement Agents (MAs) to 
programmatically use information found in those other Registries' entries.

I hope these changes address the comments.
Regards, marcelo

El 18/09/15 a las 00:49, STARK, BARBARA H escribió:
>> Co-authors don't want to add a *goal* that the Registry format be re-used,
>> because:
> I've thought some more, and would like to suggest the following, much briefer, slightly modified, and more concrete proposal. This is mostly consistent with the previous proposal.
>
> 1. Acknowledge in Abstract, Introduction, and Scope that the document defines a Registry format. [This is really important, in order for other orgs to feel comfortable referencing just the format.]
> 2. Mention in the Introduction that while the Registry format is being defined for the IANA Registry, other Registries may choose to use it as well. (that's the non-normative may)
> 3. Also in the Introduction, mention that others who are creating Registries to be used in the context of an LMAP framework are encouraged to use the Registry format, because this makes it easier for developers of LMAP Measurement Agents (MAs) to programmatically use information found in those other Registries' entries.
>
> Barbara
>
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm
>
>


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To: ippm@ietf.org, Al Morton <acmorton@att.com>, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
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From: marcelo bagnulo braun <marcelo@it.uc3m.es>
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Subject: Re: [ippm] metric registry data formats
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Hi,

I am a bit confused about this comment and the follow up discussion.

Are you guys talking about draft-ietf-ippm-metric-registry-04 or about 
draft-morton-ippm-initial-registry-00?

The registry is defined in draft-ietf-ippm-metric-registry-04 and afaict 
it does not define any data encoding, does it?

If this is the case, then i think the registry definition already 
fullfills what Juergen and Barbara are asking for?

Now, draft-morton-ippm-initial-registry-00 does defines the data format 
for the different parameters. I think we have a few options here.
- either each registry entry defines the data format (not required nor 
prevented by the current registry format document), which would imply 
that two metrics with everything the same except for the data format 
would be two different entries in the registry. This may be reasonable, 
since if what we want is to guarantee interoperability, the data format 
used by the MA and the cotnroller must be the same and using two 
different formats should result in different entries.
- either the registry entries do not define any format and it is up to 
the involved parties to make sure they use the same format, which is 
allowed by the current registry format.
- either to add the fixed parameter Al was suggesting describing the 
format used in thei particular entry. This again is supported by the 
registry.

So, in terms of the registry document i.e. 
draft-ietf-ippm-metric-registry i understand we have a few options:

- leave it as it is, as it seems to support all the considered options
- include some guidelines about how to handle this particular issue, or 
at least describing the 3 options above to handle it
- mandate an encoding

I wouldnt go for the last option.
I am fine with either of the first two.

Opinions?

regards, marcelo



El 30/09/15 a las 12:27, Juergen Schoenwaelder escribió:
> Hi,
>
> the metrics registry seems to mandate data encoding. For example,
> entries say that an IPv4 address is a 32 bit unsigned integer or that
> a timestampe is to be represented as a specific NTP encoding. The
> general assumption here seems to be that metric parameters (and
> outputs) are encoded in binary formats. Given that LMAP intends to use
> the metrics registry with protocols that use XML or JSON as their
> encoding, it seems kind of odd to represent parameters in binary
> (which essentially leads to base64 encoded values).
>
> My proposal would be that the metrics registry entries instead define
> clearly what the parameters are and what the precision requirements
> are but that they leave the encoding details to users of the registry.
> I would also be fine if there are specific suggestions, e.g., for use
> with YANG, the IP address parameters are represented as an ip-address
> as defined in RFC 6991. Or anything in between is fine - I just would
> dislike to configure parameters in binary base64 encoded values.
>
> /js
>


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To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, "STARK, BARBARA H" <bs7652@att.com>, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
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From: marcelo bagnulo braun <marcelo@it.uc3m.es>
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Date: Mon, 12 Oct 2015 10:04:04 +0200
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Subject: Re: [ippm] metric registry parameter names
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So, trying to wrap this one.
I suggest to add:

In the fixed parameter section, the following text:

In any case, Parameters MUST have well defined names.
For Human readers, the hanging indent style will work, and the
names and definitions that do not appear in the Reference Method
Specification should appear in this column.

In the Packet Generation Stream section, it now reads:

<t>Stream Parameters: The names, values and formats of input factors
for each type of stream. For example, the average packet rate
and distribution truncation value for streams with
Poisson-distributed inter-packet sending times.</t>

In the Sampling distribution section:

<t>Parameters: The names, values and formats of parameters, if any.</t>

In the run time parameters section:

<t>Parameters MUST have well defined names.
For Human readers, the hanging indent style will work, and the
names and definitions that do not appear in the Reference Method
Specification should appear in this column</t>

would this address this issue?

Regards, marcelo




El 02/10/15 a las 05:00, MORTON, ALFRED C (AL) escribió:
> Hi Barbara and Juergen,
>
> I'm sorry to join in late (and at late hours).
> Here's what I take away as additional considerations
> or requirements for the registry format (which must be
> reflected in the initial entries, of course):
>
> Parameters (Fixed and Run-time) MUST have well defined names.
> For Human readers, the hanging indent style will work, and the
> names and definitions that do not appear in the Reference Method
> Specification should appear in that column, with other additional
> details.
>
> Now, some other items (possibly) needing discussion/contribution:
>
> The example, Act_IP_UDP_Round-trip_Delay_Raw_95th-percentile_Poisson,
> includes requirements on the UDP Payload, that it contain a sequence
> number, a time stamp, and padding. This aspect of the Fixed parameters
> is a hold-over from our earliest examples and drafts.
> I suggest:
>   - noting that the Reference Method requires sequence numbers to
>     establish packet correspondence.
>   - noting that the chosen measurement protocol will dictate the format of
>     sequence numbers and time-stamps, if they are conveyed in the packet.
>   - providing the payload size in octets as a Fixed parameter.
> The sequence numbers or timestamps are not Run-time parameters.
> They must be determined by the measurement process itself after the
> Fixed and Runtime parameters are passed to that process.
>
> Also, in the Act_IP_UDP_Round-trip_Delay_Raw_95th-percentile_Poisson example
> (and others that were copied from this one, I somehow reversed the meaning of
> lambda when attempting to provide a simple data format (NTP short format, 32 bit),
> I couldn't format lambda easily as a rate, so went for 1/lambda as a time
> (and the corresponding edits were screwed-up == thanks for catching that Barbara).
>
> Default values for Run-time parameters: IPPM has never attempted to agree
> on defaults, for 1/lambda, for example.  From the earliest comparisons (1998?),
> RIPE and Advanced didn't use the same values for lambda.  Also, some Run-time
> parameters (Source IP address) cannot have meaningful defaults.  So, I propose
> that parameters are either Fixed (with values) or Run-time (no value).
>
> Automation/Machine parsing: We discussed this in Dallas, and I listened to the
> recording again last night. In the exchange between Marcelo and Barbara, I think
> there was agreement (for someone) to propose a JSON format for Fixed Parameters.
> Today, Barbara expressed an interest in Index, URI, Fixed, Run-time, and some field
> under the Output category to be highly machine parse-able.
> I'd like to be sure that some machine is actually going to read all this
> material. We started the registry assuming that human implementers would
> need to read the entries. If there's a use case where machines access
> the registry themselves, whenever they need to, I'm interested to hear about it.
> "I, for one, welcome our new computer overlords." ;-/
>
> Last for this thread: Naming conventions, with word separation.
> Please make some referenceable suggestions: I don't think we need/want
> to create anything new.
>
> Last^2: It was clear to me that Barbara did some extensive background
> reading into IPPM's literature/RFCs. Welcome to IPPM, Barbara, you're one
> of us now.
>
> regards,
> Al
>
>
>
>
>> -----Original Message-----
>> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of STARK, BARBARA H
>> Sent: Thursday, October 01, 2015 11:30 AM
>> To: Juergen Schoenwaelder
>> Cc: ippm@ietf.org
>> Subject: Re: [ippm] metric registry parameter names
>>
>> *** Security Advisory: This Message Originated Outside of AT&T ***.
>> Reference http://cso.att.com/EmailSecurity/IDSP.html for more
>> information.
>>
>>> The quoting is perhaps helpful but still subtle. I would rather have
>>> something like this (inspired by good old man pages):
>>>
>>> The following parameters are defined and/or provided default values
>>> here:
>>>
>>>   upper-limit: The upper-limit defines the time limit on Poisson
>>>                distribution (values above this limit will be clipped
>>>                and set to the limit value). Default of the upper-limit
>>>                is 30 seconds.
>>>
>>>   seq-num:     The seq-num is an 8-byte field inside the payload of the
>>>                test packet. The source host shall set the initial value
>>>                of seq_num in the payload of the first test packet and
>>>                increment it by 1 with each subsequent test packet.
>>>
>>>   timestamp:   The timestamp is an 8 byte field inside the payload
>>>                of the test packet. The source host shall set the
>>> 	      timestamp value in each test packet payload.
>> In the Reference Definition where additional parameters are defined, I
>> think this makes sense. BTW, I've been thinking about the default for
>> parameters defined inside a registry entry, and think this probably does
>> need to also be provided in the Run-time Parameters field. I could
>> envision different registry entries that reference the same RFC using
>> different defaults for registry-defined parameters.
>>
>>> [...]
>>>
>>> For automation, it would be nice to have a machine readable format
>>> that might also indicate other aspects such as data type and units or
>>> precision where they make sense. But a rendering such as shown above
>>> makes it easy for developers to identify the set of options and to
>>> lookup specific definitions.
>> I would like for Identifier, URI, Run-time Parameters, Fixed Parameters,
>> and some field under Output to be highly machine-readable/parsable. I
>> was actually wondering if we could just use JSON format for the
>> parameter and output fields that need to be parsable. My expectation is
>> that a developer would be able to code a single executable for all
>> registry entries with URI starting with
>> "urn:ietf:params:performance:metric:Act_IP_UDP_Periodic-var_UDP-Payload-
>> 142_One-way_Delay" (see section 7 of draft-morton-ippm-initial-registry
>> for this example). The Controller (or whatever configures the
>> Controller) could get the fixed and default parameter values from the
>> registry entry in order to set these in the MA (for a measurement task).
>> In looking at this particular example, that would also suggest that
>> output-type (which can be "raw" or "summary") and calculation (which can
>> be "Percentile95", "Mean", "Min", "Max", or "Std_Dev") need to be
>> provided either as Fixed Parameters or as Output
>>    Paramet
>>   ers defined in an Output category column.
>>
>>> PS: I personally prefer to not use underscores but dashes instead (the
>>>      command line tools on Unix-like systems I am familiar with tend to
>>>      use dashes instead of underscores).
>> I'm not particular. As long as there are rules/conventions. I would
>> prefer if we just pick some existing well-defined rules/conventions and
>> point to them for the fields that need to be parsable. The other fields
>> do also need conventions (like man pages) to make them easily human
>> readable. I'll gladly support any commonly-used convention.
>> Barbara
>>
>> _______________________________________________
>> 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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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>, "ippm@ietf.org" <ippm@ietf.org>
Date: Mon, 12 Oct 2015 09:31:08 -0400
Thread-Topic: [ippm] metric registry url and related format / automation question
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Subject: Re: [ippm] metric registry url and related format / automation question
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Hi Juergen,
I somehow missed this one -- reply to your comment below.
Al
> -----Original Message-----
> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Juergen
> Schoenwaelder
> Sent: Wednesday, September 30, 2015 6:38 AM
> To: ippm@ietf.org
> Subject: [ippm] metric registry url and related format / automation
> question
>=20
> Hi,
>=20
> every registry entry has a set of identifiers:
>=20
> - a number (registry unique)
> - a (longish) name (registry unique)
> - a URN (a concatenation of the name with a registry prefix) (globally
> unique)
> - a URL to point to something retrivable
>=20
> The last one seems rather underspecified. Is the URL pointing to a web
> page that is intended for humans to read about the metric=20
[ACM]=20
Yes, there are several reasons to do this:

We will have a URL pointing to exactly *one* registry entry.=20
I discussed this possibility with IANA, and they (Amanda)=20
agreed to provide it.

The separate files can be more easily edited and re-used
by folks when preparing new entries.

The separate files can be copied and handed to a developer,=20
"augment the code so it performs this metric".=20
An HTML file could have links to all the references the developer needs,
like the HTML-versions of Internet Drafts (and the code that generates
them).

We have a registry with 4 Summary columns, with the "long-ish name"
and Description. when you add the nitty-gritty details there are
about 20 columns and some of the entries will have a lot of text.=20
A table with ~20 columns, some wide, would be difficult to read
on the screen.


> ...or is the idea
> that I get a machine readable version of the registry entry? In the
> later case, the format would have to be defined somehow.=20
[ACM]=20
No. I think we still need to learn a solid use case=20
and the specific columns that need to be machine parse-able.
The Fixed parameters column is certainly a candidate based on=20
discussions so far, but how and when in the measurement system
development process/operation would it be better to have machine=20
parse-able info? Many of our columns contain info that machines=20
would find useless (e.g., Description).=20

> ... I guess the
> underlying question is whether tools are expected to access the registry
> in order to for example dynamically learn about the possible parameters
> (and their data types) for a metric or is the idea that essentially the
> conversion of the registry content into running code is a manual
> process?
[ACM]=20
The development of measurement code is certainly a manual process,
and those developers are our target users.

I think the over-arching goal of our registry work is to ensure
that independent implementations of measurement systems could
conduct measurements of the same metrics using equivalent methods,
and produce comparable results -- IOW, two implementations measuring
identical network conditions would produce statistically equivalent
results.

The idea that measurement devices would access any version of registry
as part of on-going operations never crossed my mind. The possibility
was something Barbara first mentioned in Dallas this year (and that's
over two years after some of us started work to define the registry).

So, it's certainly possible to produce some machine-readable formats.
Or, for humans other than the registry authors to produce them and
make them accessible to their measurement system (which could be operating
in a private address space where the IANA registry is un-reachable).

What developers plan such dynamic systems that would access the registry
on an on-going basis?


From nobody Tue Oct 13 03:10:50 2015
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From: Joachim Fabini <Joachim.Fabini@tuwien.ac.at>
To: Brian Trammell <ietf@trammell.ch>, ippm@ietf.org
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Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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Hi Brian, Al, IPPM,

I've read it and it's good... ;) The active-passive-hybrid definition
and categorization helps enormously and should have been started years
ago - many thanks to Al for taking the initiative. I consider this work
to be relevant also for the scientific community. In particular the term
hybrid is used with many diverging meanings (commonly as a buzzword when
applying for new project funding), so I spent some time on reviewing and
reasoning about. Disclaimer: I've not been involved into earlier
discussions on this draft and it's the first time I read it. Consider it
to be an unbiased first-time-reader opinion.

Comments (sequential reading, _no_ priority ordering):

Sec. 3.4 (1) s/"a packet stream..."/"Additional packet streams..."/ to
be more generic? Any stream can be an aggregate of other streams, but
the second variant seems to be more accurate and flexible (thinking of
several streams with distinct sources and destinations for impairing
distinct sub-paths of the measurement path).

Sec. 3.4 (2) "The packets in the stream(s) of interest have fields (or
are augmented or modified to include fields) which are dedicated to
measurements"
Proposed (relaxing) addition: Instead of dedicated measurement fields an
aggregated set of packet header _values_ can be sufficient to identify
packets as being part of the active measurement stream.
Considering the hypothetical case of UDP BTC measurements, the traffic
is actively generated, so the method is active. But packets are not
marked, nor are there any specific fields like sequence numbers that can
be used to identify packets. And for a UDP BTC metric there is no need
for such. One could argue that packets of a UDP measurement stream can
be identified by SRC/DST IP addresses and port numbers, which is why
these fields are dedicated to measurement - but that's not intuitive.
Alternatively the two occurrences of "fields" could be replaced by
"fields or field values". The key is that these specific measurement
stream packets are selected/evaluated/measured in at least one
measurement location. Possibly nitpicking?

Sec. 3.4 (3) possible typo (known a' priori)

Sec. 3.4: not sure: does it make sense to mention in a note  possible
changes of packet type (Type-P) along the measurement path (e.g.
IPv4->IPv6, tunneling, addition of headers) and possible resulting
measurement issues? We address this issue in the IPv6 draft but my
feeling is that it can help to raise reader's awareness in this draft,
too. Type-P at the source does not necessarily mean same Type-P at the
destination (same observation is valid for passively observing
intermediate nodes)

Sec. 3.6: What about Passive Measurements and generating background
load? Consider the case of passive monitoring of a cellular link that
does on-demand capacity allocation. The measurement process observes the
measurement stream at ingress and egress. One might be tempted to
generated some background load that triggers allocation of additional
capacity on the link. Where does this method fit into: passive or
hybrid? I'm not sure. As a matter of consistency with the section on
active methods (where you mention background load traffic explicitly) it
might be appropriate to discuss this special case for passive methods, too.

Sec. 3.7: Last paragraph (sentence) is very long and difficult to
understand, including possible typos. Should "basis of reference events
as packet pass reference point" read "basis of reference events that are
generated as packet_s_ pass reference points"? Rephrasing can help here.

Sec. 3.8: The differentiation between hybride-active-passive is not
clear to me from the definition in 3.8. I believe that the definition of
"hybrid" {sh|c}ould be sharpened to delimit "hybrid" more accurately
from active and passive.

One particular case of hybrid measurement - imho the most compelling one
- is the one where passive measurements are combined with additions of
fields or changes of field values in intermediate
(observation/measurement) nodes. This includes all kinds of packet
markings, addition of header fields or changes in header field values in
intermediate nodes. However, to make the measurement hybrid, these
changes must be a _consequence_ or _result_ of actions undertaken by the
(otherwise passive) _measurement_ process.
My personal opinion on this:
a) Active: whenever the measurement process generates a dedicated stream
of measurement packets, where packets are identifiable either by
dedicated measurement fields (either in payload or header), and/or by
(possibly aggregated, i.e., set of) field values, the method/metric can
be categorized as active
b) Passive: whenever the measurement process observes an existing stream
of packets without changing/adding/removing any packet fields or field
values. The passive monitoring _must_not_ add/change/remove header
fields or header field values. Although passive monitoring might bias
the timing of the observed traffic to some extent (be it by setting
interfaces into promiscous mode or by inserting splitters into the path)
it does not do this _intentionally_. Open question: into which category
does the generation of background load for passive measurements fit?
c) Hybrid: the measurement acts exclusively on existing traffic, that
is, anything that is categorized as passive (b). However, the
_measurement_ process adds/changes/removes fields or changes packet
field values in (intermediate) nodes as part of the measurement (may be
header or payload). Obviously, IPv4 header updates that result from
forwarding rules (checksum, TTL) are NOT part of the measurement
process. Question: does "passive + background load" fit into hybrid?

Sec. 3.8: Possible Typo: Y.1540 define_s_ -> _d_?

Sec. 4: 1. Possible typo "effects" -> "biases"?

Sec. 4: "To keep simple, we consider the stream effect only when it is
present".
This statement imho conflicts with the main findings of RFC7312. Today's
networks store flow/stream state at layers below IP, so networks have a
"historic view". I doubt that this bias can be ignored - infact the bias
of past periods is visible during the current measurement period. A
mention of possible consequences in stateful networks with reference to
7312 could be a cheap solution (not sure if this is sufficient).

Sec. 4: ASCII diagram: it might improve readability to add axis labels
(don't know how this can be done easily, maybe split/break descriptions
of reference points onto several lines): y axis label: "Measurement
stream capacity", x axis label: "Stream characteristics known".
In this context its's also not clear to me whether stream
characteristics must be just "known" or if they must be
controled/generated/changed.

Sec. 4, 4.1, 4.2: Page 7: The examples (and detailed reasoning) are
excellent here to support and illustrate the categories defined before.
Still, I believe that an earlier clear categorization
active/passive/hybrid in sec. 3.8 can ease the reading.

Sec. 4.1., 4.2: I fully agree with the categorization. However, is the
"small effect" essential for these examples/statement? One could find
several cases when the bias onto measurements is substantial - anything
between a) "packets become too large when adding the PDM header and
results in <IPv6-fragementation-required> to the sending host", b) "Size
increase with PDM header makes stream to exceed a network threshold and
trigger channel capacity re-allocation" and c) "subsequent nodes on the
path drop these packets because of the measurement node modifications".
All of these actions should result in substantial bias of measurement
results. And even the change of field values could result in
intermediate nodes to apply distinct forwarding policies to the packets.

The point is that the measurement process _intends_ to introduce a
minimum bias but it's quite difficult to estimate the consequences onto
measurement results. If this _intention_ is key, then I'm fine with the
wording. Otherwise one could think about a possible rephrase.

Summarizing: I consider this draft and its definitions to be essential
for the work and discussions of IPPM and related working groups. It
tackles the definitions it is supposed to and treats them in adequate
depth. As a first-time reader I had the impression that some few
sentences and clarifications can substantially improve the
categorization and delimiting of active/passive/hybrid methods in sec.
3.4-3.8 - I consider this to be the key part of the draft.

regards
Joachim



On 07.10.2015 12:47, Brian Trammell wrote:
> Greetings, all,
> 
> WG last call on draft-ietf-ippm-active-passive-01 begins today, and will end Wednesday 21 October 2015. Please send any comments (including "I've read it and it's good" :) ) to the ippm@ietf.org list.
> 
> Thanks, cheers,
> 
> Brian (chair hat)
> 
> 
> 
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm
> 


From nobody Wed Oct 14 01:25:15 2015
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Subject: [ippm] Fwd: New Version Notification for draft-fabini-ippm-2330-time-00.txt
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Dear IPPM,

Al and I have prepared and submitted a new draft that seeks to update
another important aspect of RFC2330: time and timestamps. Main topics
that the draft is supposed to to tackle include
- an accurate definition (and guidelines) for host time,
- a renaming of wire time (to account for wireless networks),
- a discussion of the consequences of virtualization onto measurements.

The document is currently in an _early_ stage, summarizing
timestamp-related topics that have been identified to require an update.
The main intention of the draft is to trigger discussions following the
presentation, including the identification of possible associated topics
to be included. We have asked for a timeslot to present this work at the
IPPM meeting @ IETF94. Any input and/or opinion (either in advance to
the ippm mailing list or following the presentation) is warmly welcome.

Background: As of today, 2330-based metrics are supposed to treat host
time variations (including the ones resulting from accessing timers at
distinct protocol layers) as "measurement uncertainties". In the light
of time-critical communications we believe that this is no longer
adequate and that metric definitions can benefit from a more
accurate/differentiated host time definition. Virtualized measurement
environments are an additional challenge. Concerning the consequences of
timestamp location selection for measurements, you can find some results
in the paper cited in the draft as reference (M2M communication delay
challenges - please drop me an email if you need a copy for personal use).

regards,
Joachim (on behalf of the authors)


-------- Forwarded Message --------
Subject: New Version Notification for draft-fabini-ippm-2330-time-00.txt
Date: Tue, 13 Oct 2015 23:37:12 -0700
From: internet-drafts@ietf.org
To: Joachim Fabini <Joachim.Fabini@tuwien.ac.at>, Al Morton
<acmorton@att.com>, Joachim Fabini <joachim.fabini@tuwien.ac.at>


A new version of I-D, draft-fabini-ippm-2330-time-00.txt
has been successfully submitted by Joachim Fabini and posted to the
IETF repository.

Name:		draft-fabini-ippm-2330-time
Revision:	00
Title:		Updates for IPPM's Framework: Timestamping and Use Cases
Document date:	2015-10-14
Group:		Individual Submission
Pages:		10
URL:
https://www.ietf.org/internet-drafts/draft-fabini-ippm-2330-time-00.txt
Status:
https://datatracker.ietf.org/doc/draft-fabini-ippm-2330-time/
Htmlized:       https://tools.ietf.org/html/draft-fabini-ippm-2330-time-00


Abstract:
   Quality and accuracy of measurements depend on the selection of
   appropriate locations and timers for timestamp acquisition.  This
   memo updates the IP Performance Metrics (IPPM) Framework RFC 2330
   with new considerations on timers, timestamps and time-related
   definitions with particular focus on wireless networks and
   virtualized hosts.






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

The IETF Secretariat





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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: "ippm@ietf.org" <ippm@ietf.org>
Date: Wed, 14 Oct 2015 08:46:29 -0400
Thread-Topic: Proposed Change of Intended Status: draft-ietf-checksum-trailer
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Subject: Re: [ippm] Proposed Change of Intended Status: draft-ietf-checksum-trailer
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IPPM,=20

It appears that no one has a problem with this change,
so Tal will submit the draft with experimental status.

regards,
Al
doc shepherd

> >From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com]
> >Sent: Tuesday, October 06, 2015 6:02 PM
> >To: Brian Trammell (ietf@trammell.ch); Bill Cerveny
> >(ietf@wjcerveny.com); ippm@ietf.org
> >Cc: Spencer Dawkins (spencerdawkins.ietf@gmail.com); Tal Mizrahi
> >Subject: Proposed Change of Intended Status:
> >draft-ietf-checksum-trailer
> >
> >IPPM,
> >
> >In my role as Doc Shepherd for
> >https://tools.ietf.org/html/draft-ietf-ippm-checksum-trailer-02
> >here's the status as I know it.
> >
> >We had notification of IPR on this draft to IPPM list in August:
> >no one replied, and I mentioned this in an revision of the Shepherd's
> >form (in September).
> >
> >Subsequently, the NTP working Group reviewed a similar checksum feature
> >for NTP whose document status was Experimental.
> >It has been proposed that theses related drafts proceed to IESG with
> >the
> >*same* Intended Status.
> >
> >**ACTION**
> >This message opens another comment period to ask the WG if there is any
> >concern with a change of draft-ietf-checksum-trailer status to
> >Experimental from Informational.  Brian Haberman clarified that we do
> >not need to re-do Last Call if we make this change, as Experimental and
> >Informational are considered the same level.
> >
> >Please send any comments regarding this Intended Status change to the
> >ippm- list, by October 13, 2015.
> >
> >thanks and regards,
> >Al
> >


From nobody Wed Oct 14 05:51:31 2015
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Subject: [ippm] I-D Action: draft-ietf-ippm-checksum-trailer-03.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the IP Performance Metrics Working Group of the IETF.

        Title           : UDP Checksum Complement in OWAMP and TWAMP
        Author          : Tal Mizrahi
	Filename        : draft-ietf-ippm-checksum-trailer-03.txt
	Pages           : 12
	Date            : 2015-10-14

Abstract:
   The One-Way Active Measurement Protocol (OWAMP) and the Two-Way
   Active Measurement Protocol (TWAMP) are used for performance
   monitoring in IP networks. Delay measurement is performed in these
   protocols by using timestamped test packets. Some implementations use
   hardware-based timestamping engines that integrate the accurate
   transmission timestamp into every outgoing OWAMP/TWAMP test packet
   during transmission.  Since these packets are transported over UDP,
   the UDP checksum field is then updated to reflect this modification.
   This document proposes to use the last 2 octets of every test packet
   as a Checksum Complement, allowing timestamping engines to reflect
   the checksum modification in the last 2 octets rather than in the UDP
   checksum field. The behavior defined in this document is completely
   interoperable with existing OWAMP/TWAMP implementations.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ippm-checksum-trailer/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-ippm-checksum-trailer-03

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ippm-checksum-trailer-03


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

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


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Subject: [ippm] Draft IETF94 Agenda
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The draft IETF94 agenda has been posted at =
https://www.ietf.org/proceedings/94/agenda/agenda-94-ippm.  If there are =
any changes, additions, or deletions, please let me know.

Thanks,

Bill Cerveny
IPPM WG Co-chair=


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To: "MORTON, ALFRED C (AL)" <acmorton@att.com>
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--001a1143c0f61358b9052210af72
Content-Type: text/plain; charset=UTF-8

Hi, Al,

On Wed, Oct 14, 2015 at 7:46 AM, MORTON, ALFRED C (AL) <acmorton@att.com>
wrote:

> IPPM,
>
> It appears that no one has a problem with this change,
> so Tal will submit the draft with experimental status.
>

I see that https://tools.ietf.org/html/draft-ietf-ippm-checksum-trailer-03
has experimental status. Are you ready for this draft to move forward?

Spencer

--001a1143c0f61358b9052210af72
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<div dir=3D"ltr">Hi, Al,<div class=3D"gmail_extra"><br><div class=3D"gmail_=
quote">On Wed, Oct 14, 2015 at 7:46 AM, MORTON, ALFRED C (AL) <span dir=3D"=
ltr">&lt;<a href=3D"mailto:acmorton@att.com" target=3D"_blank">acmorton@att=
.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,=
204);border-left-style:solid;padding-left:1ex">IPPM,<br>
<br>
It appears that no one has a problem with this change,<br>
so Tal will submit the draft with experimental status.<br></blockquote><div=
><br></div><div>I see that <a href=3D"https://tools.ietf.org/html/draft-iet=
f-ippm-checksum-trailer-03">https://tools.ietf.org/html/draft-ietf-ippm-che=
cksum-trailer-03</a> has experimental status. Are you ready for this draft =
to move forward?</div><div><br></div><div>Spencer=C2=A0</div></div><br></di=
v></div>

--001a1143c0f61358b9052210af72--


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--_000_4AF73AA205019A4C8A1DDD32C034631D0BB67F9087NJFPSRVEXG0re_--


From nobody Wed Oct 14 10:57:32 2015
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Subject: [ippm] Last Call: <draft-ietf-ippm-checksum-trailer-03.txt> (UDP Checksum Complement in OWAMP and TWAMP) to Informational RFC
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The IESG has received a request from the IP Performance Metrics WG (ippm)
to consider the following document:
- 'UDP Checksum Complement in OWAMP and TWAMP'
  <draft-ietf-ippm-checksum-trailer-03.txt> as Informational RFC

The IESG plans to make a decision in the next few weeks, and solicits
final comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2015-10-28. Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the
beginning of the Subject line to allow automated sorting.

Abstract


   The One-Way Active Measurement Protocol (OWAMP) and the Two-Way
   Active Measurement Protocol (TWAMP) are used for performance
   monitoring in IP networks. Delay measurement is performed in these
   protocols by using timestamped test packets. Some implementations use
   hardware-based timestamping engines that integrate the accurate
   transmission timestamp into every outgoing OWAMP/TWAMP test packet
   during transmission.  Since these packets are transported over UDP,
   the UDP checksum field is then updated to reflect this modification.
   This document proposes to use the last 2 octets of every test packet
   as a Checksum Complement, allowing timestamping engines to reflect
   the checksum modification in the last 2 octets rather than in the UDP
   checksum field. The behavior defined in this document is completely
   interoperable with existing OWAMP/TWAMP implementations.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-ippm-checksum-trailer/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-ippm-checksum-trailer/ballot/


The following IPR Declarations may be related to this I-D:

   https://datatracker.ietf.org/ipr/2370/




From nobody Thu Oct 15 16:37:59 2015
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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: marcelo bagnulo braun <marcelo@it.uc3m.es>, "STARK, BARBARA H" <bs7652@att.com>, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
Date: Thu, 15 Oct 2015 19:37:48 -0400
Thread-Topic: [ippm] metric registry parameter names
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Subject: Re: [ippm] metric registry parameter names
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Hi Marcelo,

This is *almost* a wrap -- my issue is with the=20
"Packet Generation Stream" section.

you wrote:
> In the Packet Generation Stream section, it now reads:
>=20
> <t>Stream Parameters: The names, values and formats of input factors for
> each type of stream. For example, the average packet rate and
> distribution truncation value for streams with Poisson-distributed
> inter-packet sending times.</t>

But see one example in:=20
https://tools.ietf.org/html/draft-morton-ippm-initial-registry-00#section-4=
.3.2

This section needs to include the reference to the stream generation
method, and that's usually where the stream parameters will be defined.
For Poisson, it's RFC 2330. For Periodic, it's RFC 3432.

AND, the parameters ONLY appear in the Fixed Parameters section,=20
     OR in the Run-time Parameters section.

It would be redundant to have the parameters in Two sections, right?

So I suggest:

Packet Stream Generation <note word re-ordering, reads better to me>

   This section gives the Reference Method for generating the packet traffi=
c that is the
   basis for measurement.  For IPPM metrics, this is called the Stream,
   and can easily be described by citing one of the relevant RFCs and
   any specific details, such as the selected method among several=20
   alternatives.

For what it's worth, I plan to revise section 4 of the initial contents dra=
ft:
https://tools.ietf.org/html/draft-morton-ippm-initial-registry-00#section-4

and when we have agreement on the comments that have been raised in the las=
t few=20
weeks, I'll go back and bring the rest of the sections into sync.

regards,
Al

> -----Original Message-----
> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of marcelo bagnulo
> braun
> Sent: Monday, October 12, 2015 4:04 AM
> To: MORTON, ALFRED C (AL); STARK, BARBARA H; Juergen Schoenwaelder
> Cc: ippm@ietf.org
> Subject: Re: [ippm] metric registry parameter names
>=20
> So, trying to wrap this one.
> I suggest to add:
>=20
> In the fixed parameter section, the following text:
>=20
> In any case, Parameters MUST have well defined names.
> For Human readers, the hanging indent style will work, and the names and
> definitions that do not appear in the Reference Method Specification
> should appear in this column.
>=20
> In the Packet Generation Stream section, it now reads:
>=20
> <t>Stream Parameters: The names, values and formats of input factors for
> each type of stream. For example, the average packet rate and
> distribution truncation value for streams with Poisson-distributed
> inter-packet sending times.</t>
>=20
> In the Sampling distribution section:
>=20
> <t>Parameters: The names, values and formats of parameters, if any.</t>
>=20
> In the run time parameters section:
>=20
> <t>Parameters MUST have well defined names.
> For Human readers, the hanging indent style will work, and the names and
> definitions that do not appear in the Reference Method Specification
> should appear in this column</t>
>=20
> would this address this issue?
>=20
> Regards, marcelo
>=20
>=20
>=20
>=20
> El 02/10/15 a las 05:00, MORTON, ALFRED C (AL) escribi=F3:
> > Hi Barbara and Juergen,
> >
> > I'm sorry to join in late (and at late hours).
> > Here's what I take away as additional considerations or requirements
> > for the registry format (which must be reflected in the initial
> > entries, of course):
> >
> > Parameters (Fixed and Run-time) MUST have well defined names.
> > For Human readers, the hanging indent style will work, and the names
> > and definitions that do not appear in the Reference Method
> > Specification should appear in that column, with other additional
> > details.
> >
> > Now, some other items (possibly) needing discussion/contribution:
> >
> > The example, Act_IP_UDP_Round-trip_Delay_Raw_95th-percentile_Poisson,
> > includes requirements on the UDP Payload, that it contain a sequence
> > number, a time stamp, and padding. This aspect of the Fixed parameters
> > is a hold-over from our earliest examples and drafts.
> > I suggest:
> >   - noting that the Reference Method requires sequence numbers to
> >     establish packet correspondence.
> >   - noting that the chosen measurement protocol will dictate the
> format of
> >     sequence numbers and time-stamps, if they are conveyed in the
> packet.
> >   - providing the payload size in octets as a Fixed parameter.
> > The sequence numbers or timestamps are not Run-time parameters.
> > They must be determined by the measurement process itself after the
> > Fixed and Runtime parameters are passed to that process.
> >
> > Also, in the Act_IP_UDP_Round-trip_Delay_Raw_95th-percentile_Poisson
> > example (and others that were copied from this one, I somehow reversed
> > the meaning of lambda when attempting to provide a simple data format
> > (NTP short format, 32 bit), I couldn't format lambda easily as a rate,
> > so went for 1/lambda as a time (and the corresponding edits were
> screwed-up =3D=3D thanks for catching that Barbara).
> >
> > Default values for Run-time parameters: IPPM has never attempted to
> > agree on defaults, for 1/lambda, for example.  From the earliest
> > comparisons (1998?), RIPE and Advanced didn't use the same values for
> > lambda.  Also, some Run-time parameters (Source IP address) cannot
> > have meaningful defaults.  So, I propose that parameters are either
> Fixed (with values) or Run-time (no value).
> >
> > Automation/Machine parsing: We discussed this in Dallas, and I
> > listened to the recording again last night. In the exchange between
> > Marcelo and Barbara, I think there was agreement (for someone) to
> propose a JSON format for Fixed Parameters.
> > Today, Barbara expressed an interest in Index, URI, Fixed, Run-time,
> > and some field under the Output category to be highly machine parse-
> able.
> > I'd like to be sure that some machine is actually going to read all
> > this material. We started the registry assuming that human
> > implementers would need to read the entries. If there's a use case
> > where machines access the registry themselves, whenever they need to,
> I'm interested to hear about it.
> > "I, for one, welcome our new computer overlords." ;-/
> >
> > Last for this thread: Naming conventions, with word separation.
> > Please make some referenceable suggestions: I don't think we need/want
> > to create anything new.
> >
> > Last^2: It was clear to me that Barbara did some extensive background
> > reading into IPPM's literature/RFCs. Welcome to IPPM, Barbara, you're
> > one of us now.
> >
> > regards,
> > Al
> >
> >
> >
> >
> >> -----Original Message-----
> >> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of STARK, BARBARA
> >> H
> >> Sent: Thursday, October 01, 2015 11:30 AM
> >> To: Juergen Schoenwaelder
> >> Cc: ippm@ietf.org
> >> Subject: Re: [ippm] metric registry parameter names
> >>
> >> *** Security Advisory: This Message Originated Outside of AT&T ***.
> >> Reference http://cso.att.com/EmailSecurity/IDSP.html for more
> >> information.
> >>
> >>> The quoting is perhaps helpful but still subtle. I would rather have
> >>> something like this (inspired by good old man pages):
> >>>
> >>> The following parameters are defined and/or provided default values
> >>> here:
> >>>
> >>>   upper-limit: The upper-limit defines the time limit on Poisson
> >>>                distribution (values above this limit will be clipped
> >>>                and set to the limit value). Default of the upper-
> limit
> >>>                is 30 seconds.
> >>>
> >>>   seq-num:     The seq-num is an 8-byte field inside the payload of
> the
> >>>                test packet. The source host shall set the initial
> value
> >>>                of seq_num in the payload of the first test packet
> and
> >>>                increment it by 1 with each subsequent test packet.
> >>>
> >>>   timestamp:   The timestamp is an 8 byte field inside the payload
> >>>                of the test packet. The source host shall set the
> >>> 	      timestamp value in each test packet payload.
> >> In the Reference Definition where additional parameters are defined,
> >> I think this makes sense. BTW, I've been thinking about the default
> >> for parameters defined inside a registry entry, and think this
> >> probably does need to also be provided in the Run-time Parameters
> >> field. I could envision different registry entries that reference the
> >> same RFC using different defaults for registry-defined parameters.
> >>
> >>> [...]
> >>>
> >>> For automation, it would be nice to have a machine readable format
> >>> that might also indicate other aspects such as data type and units
> >>> or precision where they make sense. But a rendering such as shown
> >>> above makes it easy for developers to identify the set of options
> >>> and to lookup specific definitions.
> >> I would like for Identifier, URI, Run-time Parameters, Fixed
> >> Parameters, and some field under Output to be highly
> >> machine-readable/parsable. I was actually wondering if we could just
> >> use JSON format for the parameter and output fields that need to be
> >> parsable. My expectation is that a developer would be able to code a
> >> single executable for all registry entries with URI starting with
> >> "urn:ietf:params:performance:metric:Act_IP_UDP_Periodic-var_UDP-Paylo
> >> ad- 142_One-way_Delay" (see section 7 of
> >> draft-morton-ippm-initial-registry
> >> for this example). The Controller (or whatever configures the
> >> Controller) could get the fixed and default parameter values from the
> >> registry entry in order to set these in the MA (for a measurement
> task).
> >> In looking at this particular example, that would also suggest that
> >> output-type (which can be "raw" or "summary") and calculation (which
> >> can be "Percentile95", "Mean", "Min", "Max", or "Std_Dev") need to be
> >> provided either as Fixed Parameters or as Output
> >>    Paramet
> >>   ers defined in an Output category column.
> >>
> >>> PS: I personally prefer to not use underscores but dashes instead
> (the
> >>>      command line tools on Unix-like systems I am familiar with tend
> to
> >>>      use dashes instead of underscores).
> >> I'm not particular. As long as there are rules/conventions. I would
> >> prefer if we just pick some existing well-defined rules/conventions
> >> and point to them for the fields that need to be parsable. The other
> >> fields do also need conventions (like man pages) to make them easily
> >> human readable. I'll gladly support any commonly-used convention.
> >> Barbara
> >>
> >> _______________________________________________
> >> 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
> >
> >
>=20
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm


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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: marcelo bagnulo braun <marcelo@it.uc3m.es>, "ippm@ietf.org" <ippm@ietf.org>, "STARK, BARBARA H" <bs7652@att.com>, "EARDLEY, Phil" <philip.eardley@bt.com>, Benoit Claise <bclaise@cisco.com>
Date: Thu, 15 Oct 2015 19:42:32 -0400
Thread-Topic: Changes in the registry document (was Re: [ippm] review of draft-ietf-ippm-metric-registry-03
Thread-Index: AdEEvMHKn1AsbjwkRCa9+5Ezp95c9QC5lUTQ
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References: <2D09D61DDFA73D4C884805CC7865E61132A79DC6@GAALPA1MSGUSRBF.ITServices.sbc.com> <4AF73AA205019A4C8A1DDD32C034631D0BB458122D@NJFPSRVEXG0.research.att.com> <2D09D61DDFA73D4C884805CC7865E6113A9FFAA0@GAALPA1MSGUSRBF.ITServices.sbc.com> <4AF73AA205019A4C8A1DDD32C034631D0BB4581540@NJFPSRVEXG0.research.att.com> <2D09D61DDFA73D4C884805CC7865E6113AA06396@GAALPA1MSGUSRBF.ITServices.sbc.com> <561B5C44.6080000@it.uc3m.es>
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Subject: Re: [ippm] Changes in the registry document (was Re: review of draft-ietf-ippm-metric-registry-03
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Hi Marcelo,

all your proposals work for me, thanks!
Al

> -----Original Message-----
> From: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]
> Sent: Monday, October 12, 2015 3:08 AM
> To: ippm@ietf.org; STARK, BARBARA H; MORTON, ALFRED C (AL); EARDLEY,
> Phil; Benoit Claise
> Subject: Changes in the registry document (was Re: [ippm] review of
> draft-ietf-ippm-metric-registry-03
>=20
> The proposed changes to address these comments are:
>=20
> The abstract now reads:
>=20
> - This document defines the format for the Performance Metrics registry
> and defines the IANA Registry for Performance Metrics.
>=20
> The introduction now reads:
>=20
> - This document therefore requests that IANA create and maintain a
> Performance Metrics Registry, according to the maintenance procedures
> and the Performance Metrics Registry format defined in this memo.
> Although the Registry format is primarily for use by IANA, any other
> organization that wishes to create a Performance Metrics Registry MAY
> use the format for its purposes. The authors make no guarantee of the
> format's applicability to any possible set of Performance Metrics
> envisaged by other organizations. In the rest of this document, unless
> we explicitly say so, we will refer to the IANA-maintained Performance
> Metrics Registry as simply the Performance Metrics Registry.
>=20
> The scope section now reads:
> - This document is meant mainly for two different audiences.  For those
> defining new Registered Performance Metrics, it provides specifications
> and best practices to be used in deciding which Registered Performance
> Metrics are useful for a measurement study, instructions for writing the
> text for each column of the Registered Performance Metrics, and
> information on the supporting documentation required for the new
> Performance Metrics Registry entry (up to and including the publication
> of one or more RFCs or I-Ds describing it).  For the appointed
> Performance Metrics Experts and for IANA personnel administering the new
> IANA Performance Metric Registry, it defines a set of acceptance
> criteria against which these proposed Registered Performance Metrics
> should be evaluated. In addition, this document may be useful for other
> organization who are defining a Performance Metric registry of its own,
> who can rely on the Performance Metric registry defined in this
> document.
>=20
> Note that the Introduction doenst mention LMAP at all, so the last item
> would fit in the introduction, so I added the following text in the
> Interoperability section which actually talks about LMAP:
> - It should be noted that the LMAP framework explicitly allows for using
> not only the IANA-maintained Performance Metrics Registry but also other
> registries containing Performance Metrics, either defined by other
> organizations or private ones. However, others who are creating
> Registries to be used in the context of an LMAP framework are encouraged
> to use the Registry format defined in this document, because this makes
> it easier for developers of LMAP Measurement Agents (MAs) to
> programmatically use information found in those other Registries'
> entries.
>=20
> I hope these changes address the comments.
> Regards, marcelo
>=20
> El 18/09/15 a las 00:49, STARK, BARBARA H escribi=F3:
> >> Co-authors don't want to add a *goal* that the Registry format be
> >> re-used,
> >> because:
> > I've thought some more, and would like to suggest the following, much
> briefer, slightly modified, and more concrete proposal. This is mostly
> consistent with the previous proposal.
> >
> > 1. Acknowledge in Abstract, Introduction, and Scope that the document
> > defines a Registry format. [This is really important, in order for
> > other orgs to feel comfortable referencing just the format.] 2.
> Mention in the Introduction that while the Registry format is being
> defined for the IANA Registry, other Registries may choose to use it as
> well. (that's the non-normative may) 3. Also in the Introduction,
> mention that others who are creating Registries to be used in the
> context of an LMAP framework are encouraged to use the Registry format,
> because this makes it easier for developers of LMAP Measurement Agents
> (MAs) to programmatically use information found in those other
> Registries' entries.
> >
> > Barbara
> >
> > _______________________________________________
> > ippm mailing list
> > ippm@ietf.org
> > https://www.ietf.org/mailman/listinfo/ippm
> >
> >


From nobody Thu Oct 15 17:08:20 2015
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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: marcelo bagnulo braun <marcelo@it.uc3m.es>, "ippm@ietf.org" <ippm@ietf.org>, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
Date: Thu, 15 Oct 2015 20:06:52 -0400
Thread-Topic: [ippm] metric registry data formats
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Subject: Re: [ippm] metric registry data formats
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Hi Marcelo,

All the data format comments were precipitated by a review of=20
draft-morton-ippm-initial-registry-00, which provided the=20
examples of the registry entries Juergen sought.  I was very=20
happy to get some review of draft-morton-ippm-initial-registry-00.
All our descriptions are a bit abstract until we provide some
examples (we had some examples in our first version of the registry,
but now that's almost 3 years ago).  It was equally revealing to
see some example attempts to populate the LMAP Information Model,
so we had a rather productive LMAP interim meeting, all in all.

you wrote:
> So, in terms of the registry document i.e.
> draft-ietf-ippm-metric-registry i understand we have a few options:
>=20
> - leave it as it is, as it seems to support all the considered options
> - include some guidelines about how to handle this particular issue, or
> at least describing the 3 options above to handle it
> - mandate an encoding
>=20
> I wouldnt go for the last option.
> I am fine with either of the first two.

I agree to avoid a mandated encoding, but I think this is an
area of potential incompatibility, therefore:

In the registry Draft:
* I'm in favor of providing guidelines, particularly describing the
two formats which have been suggested: Binary and something compatible=20
with YANG. If both are present, we could make the units and resolution=20
equivalent.

* If others agree it is useful to provide both, then we provide a=20
Fixed parameter to select a format, with a binary format and a=20
format and a YANG/human-readable format, plus 3rd possibility to indicate
a locally-agreed format not mentioned in the registry entry?

that's where I end-up,
Al

> -----Original Message-----
> From: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]
> Sent: Monday, October 12, 2015 3:34 AM
> To: ippm@ietf.org; MORTON, ALFRED C (AL); Juergen Schoenwaelder
> Subject: Re: [ippm] metric registry data formats
>=20
> Hi,
>=20
> I am a bit confused about this comment and the follow up discussion.
>=20
> Are you guys talking about draft-ietf-ippm-metric-registry-04 or about
> draft-morton-ippm-initial-registry-00?
>=20
> The registry is defined in draft-ietf-ippm-metric-registry-04 and afaict
> it does not define any data encoding, does it?
>=20
> If this is the case, then i think the registry definition already
> fullfills what Juergen and Barbara are asking for?
>=20
> Now, draft-morton-ippm-initial-registry-00 does defines the data format
> for the different parameters. I think we have a few options here.
> - either each registry entry defines the data format (not required nor
> prevented by the current registry format document), which would imply
> that two metrics with everything the same except for the data format
> would be two different entries in the registry. This may be reasonable,
> since if what we want is to guarantee interoperability, the data format
> used by the MA and the cotnroller must be the same and using two
> different formats should result in different entries.
> - either the registry entries do not define any format and it is up to
> the involved parties to make sure they use the same format, which is
> allowed by the current registry format.
> - either to add the fixed parameter Al was suggesting describing the
> format used in thei particular entry. This again is supported by the
> registry.
>=20
> So, in terms of the registry document i.e.
> draft-ietf-ippm-metric-registry i understand we have a few options:
>=20
> - leave it as it is, as it seems to support all the considered options
> - include some guidelines about how to handle this particular issue, or
> at least describing the 3 options above to handle it
> - mandate an encoding
>=20
> I wouldnt go for the last option.
> I am fine with either of the first two.
>=20
> Opinions?
>=20
> regards, marcelo
>=20
>=20
>=20
> El 30/09/15 a las 12:27, Juergen Schoenwaelder escribi=F3:
> > Hi,
> >
> > the metrics registry seems to mandate data encoding. For example,
> > entries say that an IPv4 address is a 32 bit unsigned integer or that
> > a timestampe is to be represented as a specific NTP encoding. The
> > general assumption here seems to be that metric parameters (and
> > outputs) are encoded in binary formats. Given that LMAP intends to use
> > the metrics registry with protocols that use XML or JSON as their
> > encoding, it seems kind of odd to represent parameters in binary
> > (which essentially leads to base64 encoded values).
> >
> > My proposal would be that the metrics registry entries instead define
> > clearly what the parameters are and what the precision requirements
> > are but that they leave the encoding details to users of the registry.
> > I would also be fine if there are specific suggestions, e.g., for use
> > with YANG, the IP address parameters are represented as an ip-address
> > as defined in RFC 6991. Or anything in between is fine - I just would
> > dislike to configure parameters in binary base64 encoded values.
> >
> > /js
> >


From nobody Thu Oct 15 23:51:48 2015
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To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, marcelo bagnulo braun <marcelo@it.uc3m.es>, "ippm@ietf.org" <ippm@ietf.org>, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
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From: marcelo bagnulo braun <marcelo@it.uc3m.es>
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Date: Fri, 16 Oct 2015 08:51:39 +0200
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Subject: Re: [ippm] metric registry data formats
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Hi Al,

Basically you are suggesting to include a fixed parameter that is the 
data encoding for all input parameters and probably for all outputs, is 
that so?

Regards, marcelo


El 16/10/15 a las 02:06, MORTON, ALFRED C (AL) escribió:
> Hi Marcelo,
>
> All the data format comments were precipitated by a review of
> draft-morton-ippm-initial-registry-00, which provided the
> examples of the registry entries Juergen sought.  I was very
> happy to get some review of draft-morton-ippm-initial-registry-00.
> All our descriptions are a bit abstract until we provide some
> examples (we had some examples in our first version of the registry,
> but now that's almost 3 years ago).  It was equally revealing to
> see some example attempts to populate the LMAP Information Model,
> so we had a rather productive LMAP interim meeting, all in all.
>
> you wrote:
>> So, in terms of the registry document i.e.
>> draft-ietf-ippm-metric-registry i understand we have a few options:
>>
>> - leave it as it is, as it seems to support all the considered options
>> - include some guidelines about how to handle this particular issue, or
>> at least describing the 3 options above to handle it
>> - mandate an encoding
>>
>> I wouldnt go for the last option.
>> I am fine with either of the first two.
> I agree to avoid a mandated encoding, but I think this is an
> area of potential incompatibility, therefore:
>
> In the registry Draft:
> * I'm in favor of providing guidelines, particularly describing the
> two formats which have been suggested: Binary and something compatible
> with YANG. If both are present, we could make the units and resolution
> equivalent.
>
> * If others agree it is useful to provide both, then we provide a
> Fixed parameter to select a format, with a binary format and a
> format and a YANG/human-readable format, plus 3rd possibility to indicate
> a locally-agreed format not mentioned in the registry entry?
>
> that's where I end-up,
> Al
>
>> -----Original Message-----
>> From: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]
>> Sent: Monday, October 12, 2015 3:34 AM
>> To: ippm@ietf.org; MORTON, ALFRED C (AL); Juergen Schoenwaelder
>> Subject: Re: [ippm] metric registry data formats
>>
>> Hi,
>>
>> I am a bit confused about this comment and the follow up discussion.
>>
>> Are you guys talking about draft-ietf-ippm-metric-registry-04 or about
>> draft-morton-ippm-initial-registry-00?
>>
>> The registry is defined in draft-ietf-ippm-metric-registry-04 and afaict
>> it does not define any data encoding, does it?
>>
>> If this is the case, then i think the registry definition already
>> fullfills what Juergen and Barbara are asking for?
>>
>> Now, draft-morton-ippm-initial-registry-00 does defines the data format
>> for the different parameters. I think we have a few options here.
>> - either each registry entry defines the data format (not required nor
>> prevented by the current registry format document), which would imply
>> that two metrics with everything the same except for the data format
>> would be two different entries in the registry. This may be reasonable,
>> since if what we want is to guarantee interoperability, the data format
>> used by the MA and the cotnroller must be the same and using two
>> different formats should result in different entries.
>> - either the registry entries do not define any format and it is up to
>> the involved parties to make sure they use the same format, which is
>> allowed by the current registry format.
>> - either to add the fixed parameter Al was suggesting describing the
>> format used in thei particular entry. This again is supported by the
>> registry.
>>
>> So, in terms of the registry document i.e.
>> draft-ietf-ippm-metric-registry i understand we have a few options:
>>
>> - leave it as it is, as it seems to support all the considered options
>> - include some guidelines about how to handle this particular issue, or
>> at least describing the 3 options above to handle it
>> - mandate an encoding
>>
>> I wouldnt go for the last option.
>> I am fine with either of the first two.
>>
>> Opinions?
>>
>> regards, marcelo
>>
>>
>>
>> El 30/09/15 a las 12:27, Juergen Schoenwaelder escribió:
>>> Hi,
>>>
>>> the metrics registry seems to mandate data encoding. For example,
>>> entries say that an IPv4 address is a 32 bit unsigned integer or that
>>> a timestampe is to be represented as a specific NTP encoding. The
>>> general assumption here seems to be that metric parameters (and
>>> outputs) are encoded in binary formats. Given that LMAP intends to use
>>> the metrics registry with protocols that use XML or JSON as their
>>> encoding, it seems kind of odd to represent parameters in binary
>>> (which essentially leads to base64 encoded values).
>>>
>>> My proposal would be that the metrics registry entries instead define
>>> clearly what the parameters are and what the precision requirements
>>> are but that they leave the encoding details to users of the registry.
>>> I would also be fine if there are specific suggestions, e.g., for use
>>> with YANG, the IP address parameters are represented as an ip-address
>>> as defined in RFC 6991. Or anything in between is fine - I just would
>>> dislike to configure parameters in binary base64 encoded values.
>>>
>>> /js
>>>
>


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To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, "STARK, BARBARA H" <bs7652@att.com>, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
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From: marcelo bagnulo braun <marcelo@it.uc3m.es>
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Date: Fri, 16 Oct 2015 08:56:50 +0200
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Subject: Re: [ippm] metric registry parameter names
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below...

El 16/10/15 a las 01:37, MORTON, ALFRED C (AL) escribió:
> Hi Marcelo,
>
> This is *almost* a wrap -- my issue is with the
> "Packet Generation Stream" section.
>
> you wrote:
>> In the Packet Generation Stream section, it now reads:
>>
>> <t>Stream Parameters: The names, values and formats of input factors for
>> each type of stream. For example, the average packet rate and
>> distribution truncation value for streams with Poisson-distributed
>> inter-packet sending times.</t>
> But see one example in:
> https://tools.ietf.org/html/draft-morton-ippm-initial-registry-00#section-4.3.2
>
> This section needs to include the reference to the stream generation
> method, and that's usually where the stream parameters will be defined.
> For Poisson, it's RFC 2330. For Periodic, it's RFC 3432.
>
> AND, the parameters ONLY appear in the Fixed Parameters section,
>       OR in the Run-time Parameters section.


i can understand that
but the streams do have associated parameters that need to be provisioned
These can be provisioned in the fixed or run time parameters i agree.

> It would be redundant to have the parameters in Two sections, right?
>
> So I suggest:
>
> Packet Stream Generation <note word re-ordering, reads better to me>
>
>     This section gives the Reference Method for generating the packet traffic that is the
>     basis for measurement.  For IPPM metrics, this is called the Stream,
>     and can easily be described by citing one of the relevant RFCs and
>     any specific details, such as the selected method among several
>     alternatives.

I would add something along these lines. The packet generation stream 
may require parameters such as the the average packet rate and 
distribution truncation value for streams with Poisson-distributed 
inter-packet sending times. In case such parameters are needed, they 
should be included either in the Fixed parmaeter column or in the run 
time parameter column, depending on whehter they will be fixed or will 
be an input for the metric.

would that make sense?
> For what it's worth, I plan to revise section 4 of the initial contents draft:
> https://tools.ietf.org/html/draft-morton-ippm-initial-registry-00#section-4
>
> and when we have agreement on the comments that have been raised in the last few
> weeks, I'll go back and bring the rest of the sections into sync.
>
> regards,
> Al
>
>> -----Original Message-----
>> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of marcelo bagnulo
>> braun
>> Sent: Monday, October 12, 2015 4:04 AM
>> To: MORTON, ALFRED C (AL); STARK, BARBARA H; Juergen Schoenwaelder
>> Cc: ippm@ietf.org
>> Subject: Re: [ippm] metric registry parameter names
>>
>> So, trying to wrap this one.
>> I suggest to add:
>>
>> In the fixed parameter section, the following text:
>>
>> In any case, Parameters MUST have well defined names.
>> For Human readers, the hanging indent style will work, and the names and
>> definitions that do not appear in the Reference Method Specification
>> should appear in this column.
>>
>> In the Packet Generation Stream section, it now reads:
>>
>> <t>Stream Parameters: The names, values and formats of input factors for
>> each type of stream. For example, the average packet rate and
>> distribution truncation value for streams with Poisson-distributed
>> inter-packet sending times.</t>
>>
>> In the Sampling distribution section:
>>
>> <t>Parameters: The names, values and formats of parameters, if any.</t>
>>
>> In the run time parameters section:
>>
>> <t>Parameters MUST have well defined names.
>> For Human readers, the hanging indent style will work, and the names and
>> definitions that do not appear in the Reference Method Specification
>> should appear in this column</t>
>>
>> would this address this issue?
>>
>> Regards, marcelo
>>
>>
>>
>>
>> El 02/10/15 a las 05:00, MORTON, ALFRED C (AL) escribió:
>>> Hi Barbara and Juergen,
>>>
>>> I'm sorry to join in late (and at late hours).
>>> Here's what I take away as additional considerations or requirements
>>> for the registry format (which must be reflected in the initial
>>> entries, of course):
>>>
>>> Parameters (Fixed and Run-time) MUST have well defined names.
>>> For Human readers, the hanging indent style will work, and the names
>>> and definitions that do not appear in the Reference Method
>>> Specification should appear in that column, with other additional
>>> details.
>>>
>>> Now, some other items (possibly) needing discussion/contribution:
>>>
>>> The example, Act_IP_UDP_Round-trip_Delay_Raw_95th-percentile_Poisson,
>>> includes requirements on the UDP Payload, that it contain a sequence
>>> number, a time stamp, and padding. This aspect of the Fixed parameters
>>> is a hold-over from our earliest examples and drafts.
>>> I suggest:
>>>    - noting that the Reference Method requires sequence numbers to
>>>      establish packet correspondence.
>>>    - noting that the chosen measurement protocol will dictate the
>> format of
>>>      sequence numbers and time-stamps, if they are conveyed in the
>> packet.
>>>    - providing the payload size in octets as a Fixed parameter.
>>> The sequence numbers or timestamps are not Run-time parameters.
>>> They must be determined by the measurement process itself after the
>>> Fixed and Runtime parameters are passed to that process.
>>>
>>> Also, in the Act_IP_UDP_Round-trip_Delay_Raw_95th-percentile_Poisson
>>> example (and others that were copied from this one, I somehow reversed
>>> the meaning of lambda when attempting to provide a simple data format
>>> (NTP short format, 32 bit), I couldn't format lambda easily as a rate,
>>> so went for 1/lambda as a time (and the corresponding edits were
>> screwed-up == thanks for catching that Barbara).
>>> Default values for Run-time parameters: IPPM has never attempted to
>>> agree on defaults, for 1/lambda, for example.  From the earliest
>>> comparisons (1998?), RIPE and Advanced didn't use the same values for
>>> lambda.  Also, some Run-time parameters (Source IP address) cannot
>>> have meaningful defaults.  So, I propose that parameters are either
>> Fixed (with values) or Run-time (no value).
>>> Automation/Machine parsing: We discussed this in Dallas, and I
>>> listened to the recording again last night. In the exchange between
>>> Marcelo and Barbara, I think there was agreement (for someone) to
>> propose a JSON format for Fixed Parameters.
>>> Today, Barbara expressed an interest in Index, URI, Fixed, Run-time,
>>> and some field under the Output category to be highly machine parse-
>> able.
>>> I'd like to be sure that some machine is actually going to read all
>>> this material. We started the registry assuming that human
>>> implementers would need to read the entries. If there's a use case
>>> where machines access the registry themselves, whenever they need to,
>> I'm interested to hear about it.
>>> "I, for one, welcome our new computer overlords." ;-/
>>>
>>> Last for this thread: Naming conventions, with word separation.
>>> Please make some referenceable suggestions: I don't think we need/want
>>> to create anything new.
>>>
>>> Last^2: It was clear to me that Barbara did some extensive background
>>> reading into IPPM's literature/RFCs. Welcome to IPPM, Barbara, you're
>>> one of us now.
>>>
>>> regards,
>>> Al
>>>
>>>
>>>
>>>
>>>> -----Original Message-----
>>>> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of STARK, BARBARA
>>>> H
>>>> Sent: Thursday, October 01, 2015 11:30 AM
>>>> To: Juergen Schoenwaelder
>>>> Cc: ippm@ietf.org
>>>> Subject: Re: [ippm] metric registry parameter names
>>>>
>>>> *** Security Advisory: This Message Originated Outside of AT&T ***.
>>>> Reference http://cso.att.com/EmailSecurity/IDSP.html for more
>>>> information.
>>>>
>>>>> The quoting is perhaps helpful but still subtle. I would rather have
>>>>> something like this (inspired by good old man pages):
>>>>>
>>>>> The following parameters are defined and/or provided default values
>>>>> here:
>>>>>
>>>>>    upper-limit: The upper-limit defines the time limit on Poisson
>>>>>                 distribution (values above this limit will be clipped
>>>>>                 and set to the limit value). Default of the upper-
>> limit
>>>>>                 is 30 seconds.
>>>>>
>>>>>    seq-num:     The seq-num is an 8-byte field inside the payload of
>> the
>>>>>                 test packet. The source host shall set the initial
>> value
>>>>>                 of seq_num in the payload of the first test packet
>> and
>>>>>                 increment it by 1 with each subsequent test packet.
>>>>>
>>>>>    timestamp:   The timestamp is an 8 byte field inside the payload
>>>>>                 of the test packet. The source host shall set the
>>>>> 	      timestamp value in each test packet payload.
>>>> In the Reference Definition where additional parameters are defined,
>>>> I think this makes sense. BTW, I've been thinking about the default
>>>> for parameters defined inside a registry entry, and think this
>>>> probably does need to also be provided in the Run-time Parameters
>>>> field. I could envision different registry entries that reference the
>>>> same RFC using different defaults for registry-defined parameters.
>>>>
>>>>> [...]
>>>>>
>>>>> For automation, it would be nice to have a machine readable format
>>>>> that might also indicate other aspects such as data type and units
>>>>> or precision where they make sense. But a rendering such as shown
>>>>> above makes it easy for developers to identify the set of options
>>>>> and to lookup specific definitions.
>>>> I would like for Identifier, URI, Run-time Parameters, Fixed
>>>> Parameters, and some field under Output to be highly
>>>> machine-readable/parsable. I was actually wondering if we could just
>>>> use JSON format for the parameter and output fields that need to be
>>>> parsable. My expectation is that a developer would be able to code a
>>>> single executable for all registry entries with URI starting with
>>>> "urn:ietf:params:performance:metric:Act_IP_UDP_Periodic-var_UDP-Paylo
>>>> ad- 142_One-way_Delay" (see section 7 of
>>>> draft-morton-ippm-initial-registry
>>>> for this example). The Controller (or whatever configures the
>>>> Controller) could get the fixed and default parameter values from the
>>>> registry entry in order to set these in the MA (for a measurement
>> task).
>>>> In looking at this particular example, that would also suggest that
>>>> output-type (which can be "raw" or "summary") and calculation (which
>>>> can be "Percentile95", "Mean", "Min", "Max", or "Std_Dev") need to be
>>>> provided either as Fixed Parameters or as Output
>>>>     Paramet
>>>>    ers defined in an Output category column.
>>>>
>>>>> PS: I personally prefer to not use underscores but dashes instead
>> (the
>>>>>       command line tools on Unix-like systems I am familiar with tend
>> to
>>>>>       use dashes instead of underscores).
>>>> I'm not particular. As long as there are rules/conventions. I would
>>>> prefer if we just pick some existing well-defined rules/conventions
>>>> and point to them for the fields that need to be parsable. The other
>>>> fields do also need conventions (like man pages) to make them easily
>>>> human readable. I'll gladly support any commonly-used convention.
>>>> Barbara
>>>>
>>>> _______________________________________________
>>>> 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
>>>
>>>
>> _______________________________________________
>> ippm mailing list
>> ippm@ietf.org
>> https://www.ietf.org/mailman/listinfo/ippm
>


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To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, marcelo bagnulo braun <marcelo@it.uc3m.es>, "ippm@ietf.org" <ippm@ietf.org>, "STARK, BARBARA H" <bs7652@att.com>, "EARDLEY, Phil" <philip.eardley@bt.com>
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From: Benoit Claise <bclaise@cisco.com>
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Date: Fri, 16 Oct 2015 11:12:42 +0200
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Subject: Re: [ippm] Changes in the registry document (was Re: review of draft-ietf-ippm-metric-registry-03
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On 10/16/2015 1:42 AM, MORTON, ALFRED C (AL) wrote:
> Hi Marcelo,
>
> all your proposals work for me, thanks!
for me too.

Regards, Benoit
> Al
>
>> -----Original Message-----
>> From: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]
>> Sent: Monday, October 12, 2015 3:08 AM
>> To: ippm@ietf.org; STARK, BARBARA H; MORTON, ALFRED C (AL); EARDLEY,
>> Phil; Benoit Claise
>> Subject: Changes in the registry document (was Re: [ippm] review of
>> draft-ietf-ippm-metric-registry-03
>>
>> The proposed changes to address these comments are:
>>
>> The abstract now reads:
>>
>> - This document defines the format for the Performance Metrics registry
>> and defines the IANA Registry for Performance Metrics.
>>
>> The introduction now reads:
>>
>> - This document therefore requests that IANA create and maintain a
>> Performance Metrics Registry, according to the maintenance procedures
>> and the Performance Metrics Registry format defined in this memo.
>> Although the Registry format is primarily for use by IANA, any other
>> organization that wishes to create a Performance Metrics Registry MAY
>> use the format for its purposes. The authors make no guarantee of the
>> format's applicability to any possible set of Performance Metrics
>> envisaged by other organizations. In the rest of this document, unless
>> we explicitly say so, we will refer to the IANA-maintained Performance
>> Metrics Registry as simply the Performance Metrics Registry.
>>
>> The scope section now reads:
>> - This document is meant mainly for two different audiences.  For those
>> defining new Registered Performance Metrics, it provides specifications
>> and best practices to be used in deciding which Registered Performance
>> Metrics are useful for a measurement study, instructions for writing the
>> text for each column of the Registered Performance Metrics, and
>> information on the supporting documentation required for the new
>> Performance Metrics Registry entry (up to and including the publication
>> of one or more RFCs or I-Ds describing it).  For the appointed
>> Performance Metrics Experts and for IANA personnel administering the new
>> IANA Performance Metric Registry, it defines a set of acceptance
>> criteria against which these proposed Registered Performance Metrics
>> should be evaluated. In addition, this document may be useful for other
>> organization who are defining a Performance Metric registry of its own,
>> who can rely on the Performance Metric registry defined in this
>> document.
>>
>> Note that the Introduction doenst mention LMAP at all, so the last item
>> would fit in the introduction, so I added the following text in the
>> Interoperability section which actually talks about LMAP:
>> - It should be noted that the LMAP framework explicitly allows for using
>> not only the IANA-maintained Performance Metrics Registry but also other
>> registries containing Performance Metrics, either defined by other
>> organizations or private ones. However, others who are creating
>> Registries to be used in the context of an LMAP framework are encouraged
>> to use the Registry format defined in this document, because this makes
>> it easier for developers of LMAP Measurement Agents (MAs) to
>> programmatically use information found in those other Registries'
>> entries.
>>
>> I hope these changes address the comments.
>> Regards, marcelo
>>
>> El 18/09/15 a las 00:49, STARK, BARBARA H escribió:
>>>> Co-authors don't want to add a *goal* that the Registry format be
>>>> re-used,
>>>> because:
>>> I've thought some more, and would like to suggest the following, much
>> briefer, slightly modified, and more concrete proposal. This is mostly
>> consistent with the previous proposal.
>>> 1. Acknowledge in Abstract, Introduction, and Scope that the document
>>> defines a Registry format. [This is really important, in order for
>>> other orgs to feel comfortable referencing just the format.] 2.
>> Mention in the Introduction that while the Registry format is being
>> defined for the IANA Registry, other Registries may choose to use it as
>> well. (that's the non-normative may) 3. Also in the Introduction,
>> mention that others who are creating Registries to be used in the
>> context of an LMAP framework are encouraged to use the Registry format,
>> because this makes it easier for developers of LMAP Measurement Agents
>> (MAs) to programmatically use information found in those other
>> Registries' entries.
>>> Barbara
>>>
>>> _______________________________________________
>>> ippm mailing list
>>> ippm@ietf.org
>>> https://www.ietf.org/mailman/listinfo/ippm
>>>
>>>
> .
>


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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: marcelo bagnulo braun <marcelo@it.uc3m.es>, "STARK, BARBARA H" <bs7652@att.com>, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
Date: Fri, 16 Oct 2015 07:32:01 -0400
Thread-Topic: [ippm] metric registry parameter names
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Subject: Re: [ippm] metric registry parameter names
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more in-line... [ACM}

> -----Original Message-----
> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of marcelo bagnulo
> braun
> Sent: Friday, October 16, 2015 2:57 AM
...
> >
> > This section needs to include the reference to the stream generation
> > method, and that's usually where the stream parameters will be
> defined.
> > For Poisson, it's RFC 2330. For Periodic, it's RFC 3432.
> >
> > AND, the parameters ONLY appear in the Fixed Parameters section,
> >       OR in the Run-time Parameters section.
>=20
>=20
> i can understand that
> but the streams do have associated parameters that need to be
> provisioned These can be provisioned in the fixed or run time parameters
> i agree.
[ACM]=20
Good, thanks!



>=20
> > It would be redundant to have the parameters in Two sections, right?
> >
> > So I suggest:
> >
> > Packet Stream Generation <note word re-ordering, reads better to me>
> >
> >     This section gives the Reference Method for generating the packet
> traffic that is the
> >     basis for measurement.  For IPPM metrics, this is called the
> Stream,
> >     and can easily be described by citing one of the relevant RFCs and
> >     any specific details, such as the selected method among several
> >     alternatives.
>=20
> I would add something along these lines. The packet generation stream
> may require parameters such as the the average packet rate and
> distribution truncation value for streams with Poisson-distributed
> inter-packet sending times. In case such parameters are needed, they
> should be included either in the Fixed parmaeter column or in the run
> time parameter column, depending on whehter they will be fixed or will
> be an input for the metric.
>=20
> would that make sense?
[ACM]=20
Yes, I like it, thanks!

Al





> > For what it's worth, I plan to revise section 4 of the initial
> contents draft:
> > https://tools.ietf.org/html/draft-morton-ippm-initial-registry-00#sect
> > ion-4
> >
> > and when we have agreement on the comments that have been raised in
> > the last few weeks, I'll go back and bring the rest of the sections
> into sync.
> >
> > regards,
> > Al
> >
> >> -----Original Message-----
> >> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of marcelo
> >> bagnulo braun
> >> Sent: Monday, October 12, 2015 4:04 AM
> >> To: MORTON, ALFRED C (AL); STARK, BARBARA H; Juergen Schoenwaelder
> >> Cc: ippm@ietf.org
> >> Subject: Re: [ippm] metric registry parameter names
> >>
> >> So, trying to wrap this one.
> >> I suggest to add:
> >>
> >> In the fixed parameter section, the following text:
> >>
> >> In any case, Parameters MUST have well defined names.
> >> For Human readers, the hanging indent style will work, and the names
> >> and definitions that do not appear in the Reference Method
> >> Specification should appear in this column.
> >>
> >> In the Packet Generation Stream section, it now reads:
> >>
> >> <t>Stream Parameters: The names, values and formats of input factors
> >> for each type of stream. For example, the average packet rate and
> >> distribution truncation value for streams with Poisson-distributed
> >> inter-packet sending times.</t>
> >>
> >> In the Sampling distribution section:
> >>
> >> <t>Parameters: The names, values and formats of parameters, if
> >> any.</t>
> >>
> >> In the run time parameters section:
> >>
> >> <t>Parameters MUST have well defined names.
> >> For Human readers, the hanging indent style will work, and the names
> >> and definitions that do not appear in the Reference Method
> >> Specification should appear in this column</t>
> >>
> >> would this address this issue?
> >>
> >> Regards, marcelo
> >>
> >>
> >>
> >>
> >> El 02/10/15 a las 05:00, MORTON, ALFRED C (AL) escribi=F3:
> >>> Hi Barbara and Juergen,
> >>>
> >>> I'm sorry to join in late (and at late hours).
> >>> Here's what I take away as additional considerations or requirements
> >>> for the registry format (which must be reflected in the initial
> >>> entries, of course):
> >>>
> >>> Parameters (Fixed and Run-time) MUST have well defined names.
> >>> For Human readers, the hanging indent style will work, and the names
> >>> and definitions that do not appear in the Reference Method
> >>> Specification should appear in that column, with other additional
> >>> details.
> >>>
> >>> Now, some other items (possibly) needing discussion/contribution:
> >>>
> >>> The example,
> >>> Act_IP_UDP_Round-trip_Delay_Raw_95th-percentile_Poisson,
> >>> includes requirements on the UDP Payload, that it contain a sequence
> >>> number, a time stamp, and padding. This aspect of the Fixed
> >>> parameters is a hold-over from our earliest examples and drafts.
> >>> I suggest:
> >>>    - noting that the Reference Method requires sequence numbers to
> >>>      establish packet correspondence.
> >>>    - noting that the chosen measurement protocol will dictate the
> >> format of
> >>>      sequence numbers and time-stamps, if they are conveyed in the
> >> packet.
> >>>    - providing the payload size in octets as a Fixed parameter.
> >>> The sequence numbers or timestamps are not Run-time parameters.
> >>> They must be determined by the measurement process itself after the
> >>> Fixed and Runtime parameters are passed to that process.
> >>>
> >>> Also, in the Act_IP_UDP_Round-trip_Delay_Raw_95th-percentile_Poisson
> >>> example (and others that were copied from this one, I somehow
> >>> reversed the meaning of lambda when attempting to provide a simple
> >>> data format (NTP short format, 32 bit), I couldn't format lambda
> >>> easily as a rate, so went for 1/lambda as a time (and the
> >>> corresponding edits were
> >> screwed-up =3D=3D thanks for catching that Barbara).
> >>> Default values for Run-time parameters: IPPM has never attempted to
> >>> agree on defaults, for 1/lambda, for example.  From the earliest
> >>> comparisons (1998?), RIPE and Advanced didn't use the same values
> >>> for lambda.  Also, some Run-time parameters (Source IP address)
> >>> cannot have meaningful defaults.  So, I propose that parameters are
> >>> either
> >> Fixed (with values) or Run-time (no value).
> >>> Automation/Machine parsing: We discussed this in Dallas, and I
> >>> listened to the recording again last night. In the exchange between
> >>> Marcelo and Barbara, I think there was agreement (for someone) to
> >> propose a JSON format for Fixed Parameters.
> >>> Today, Barbara expressed an interest in Index, URI, Fixed, Run-time,
> >>> and some field under the Output category to be highly machine parse-
> >> able.
> >>> I'd like to be sure that some machine is actually going to read all
> >>> this material. We started the registry assuming that human
> >>> implementers would need to read the entries. If there's a use case
> >>> where machines access the registry themselves, whenever they need
> >>> to,
> >> I'm interested to hear about it.
> >>> "I, for one, welcome our new computer overlords." ;-/
> >>>
> >>> Last for this thread: Naming conventions, with word separation.
> >>> Please make some referenceable suggestions: I don't think we
> >>> need/want to create anything new.
> >>>
> >>> Last^2: It was clear to me that Barbara did some extensive
> >>> background reading into IPPM's literature/RFCs. Welcome to IPPM,
> >>> Barbara, you're one of us now.
> >>>
> >>> regards,
> >>> Al
> >>>
> >>>
> >>>
> >>>
> >>>> -----Original Message-----
> >>>> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of STARK,
> >>>> BARBARA H
> >>>> Sent: Thursday, October 01, 2015 11:30 AM
> >>>> To: Juergen Schoenwaelder
> >>>> Cc: ippm@ietf.org
> >>>> Subject: Re: [ippm] metric registry parameter names
> >>>>
> >>>> *** Security Advisory: This Message Originated Outside of AT&T ***.
> >>>> Reference http://cso.att.com/EmailSecurity/IDSP.html for more
> >>>> information.
> >>>>
> >>>>> The quoting is perhaps helpful but still subtle. I would rather
> >>>>> have something like this (inspired by good old man pages):
> >>>>>
> >>>>> The following parameters are defined and/or provided default
> >>>>> values
> >>>>> here:
> >>>>>
> >>>>>    upper-limit: The upper-limit defines the time limit on Poisson
> >>>>>                 distribution (values above this limit will be
> clipped
> >>>>>                 and set to the limit value). Default of the upper-
> >> limit
> >>>>>                 is 30 seconds.
> >>>>>
> >>>>>    seq-num:     The seq-num is an 8-byte field inside the payload
> of
> >> the
> >>>>>                 test packet. The source host shall set the initial
> >> value
> >>>>>                 of seq_num in the payload of the first test packet
> >> and
> >>>>>                 increment it by 1 with each subsequent test
> packet.
> >>>>>
> >>>>>    timestamp:   The timestamp is an 8 byte field inside the
> payload
> >>>>>                 of the test packet. The source host shall set the
> >>>>> 	      timestamp value in each test packet payload.
> >>>> In the Reference Definition where additional parameters are
> >>>> defined, I think this makes sense. BTW, I've been thinking about
> >>>> the default for parameters defined inside a registry entry, and
> >>>> think this probably does need to also be provided in the Run-time
> >>>> Parameters field. I could envision different registry entries that
> >>>> reference the same RFC using different defaults for registry-
> defined parameters.
> >>>>
> >>>>> [...]
> >>>>>
> >>>>> For automation, it would be nice to have a machine readable format
> >>>>> that might also indicate other aspects such as data type and units
> >>>>> or precision where they make sense. But a rendering such as shown
> >>>>> above makes it easy for developers to identify the set of options
> >>>>> and to lookup specific definitions.
> >>>> I would like for Identifier, URI, Run-time Parameters, Fixed
> >>>> Parameters, and some field under Output to be highly
> >>>> machine-readable/parsable. I was actually wondering if we could
> >>>> just use JSON format for the parameter and output fields that need
> >>>> to be parsable. My expectation is that a developer would be able to
> >>>> code a single executable for all registry entries with URI starting
> >>>> with
> >>>> "urn:ietf:params:performance:metric:Act_IP_UDP_Periodic-var_UDP-Pay
> >>>> lo
> >>>> ad- 142_One-way_Delay" (see section 7 of
> >>>> draft-morton-ippm-initial-registry
> >>>> for this example). The Controller (or whatever configures the
> >>>> Controller) could get the fixed and default parameter values from
> >>>> the registry entry in order to set these in the MA (for a
> >>>> measurement
> >> task).
> >>>> In looking at this particular example, that would also suggest that
> >>>> output-type (which can be "raw" or "summary") and calculation
> >>>> (which can be "Percentile95", "Mean", "Min", "Max", or "Std_Dev")
> >>>> need to be provided either as Fixed Parameters or as Output
> >>>>     Paramet
> >>>>    ers defined in an Output category column.
> >>>>
> >>>>> PS: I personally prefer to not use underscores but dashes instead
> >> (the
> >>>>>       command line tools on Unix-like systems I am familiar with
> >>>>> tend
> >> to
> >>>>>       use dashes instead of underscores).
> >>>> I'm not particular. As long as there are rules/conventions. I would
> >>>> prefer if we just pick some existing well-defined rules/conventions
> >>>> and point to them for the fields that need to be parsable. The
> >>>> other fields do also need conventions (like man pages) to make them
> >>>> easily human readable. I'll gladly support any commonly-used
> convention.
> >>>> Barbara
> >>>>
> >>>> _______________________________________________
> >>>> 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
> >>>
> >>>
> >> _______________________________________________
> >> ippm mailing list
> >> ippm@ietf.org
> >> https://www.ietf.org/mailman/listinfo/ippm
> >
>=20
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm


From nobody Fri Oct 16 04:36:42 2015
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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: marcelo bagnulo braun <marcelo@it.uc3m.es>, "ippm@ietf.org" <ippm@ietf.org>, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
Date: Fri, 16 Oct 2015 07:36:34 -0400
Thread-Topic: [ippm] metric registry data formats
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References: <20150930102741.GA1699@elstar.local> <561B625E.8020105@it.uc3m.es> <4AF73AA205019A4C8A1DDD32C034631D0BB67F9360@NJFPSRVEXG0.research.att.com> <56209E7B.2060409@it.uc3m.es>
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Subject: Re: [ippm] metric registry data formats
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I did, but now I see that this needs to be a *Run-time*
parameter, of course! (this was the last message I sent last=20
night, sorry).

It is a way to cover the most popular choice of output,
without expanding the registry with an entry for each format.

Al

> -----Original Message-----
> From: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]
> Sent: Friday, October 16, 2015 2:52 AM
> To: MORTON, ALFRED C (AL); marcelo bagnulo braun; ippm@ietf.org; Juergen
> Schoenwaelder
> Subject: Re: [ippm] metric registry data formats
>=20
> Hi Al,
>=20
> Basically you are suggesting to include a fixed parameter that is the
> data encoding for all input parameters and probably for all outputs, is
> that so?
>=20
> Regards, marcelo
>=20
>=20
> El 16/10/15 a las 02:06, MORTON, ALFRED C (AL) escribi=F3:
> > Hi Marcelo,
> >
> > All the data format comments were precipitated by a review of
> > draft-morton-ippm-initial-registry-00, which provided the examples of
> > the registry entries Juergen sought.  I was very happy to get some
> > review of draft-morton-ippm-initial-registry-00.
> > All our descriptions are a bit abstract until we provide some examples
> > (we had some examples in our first version of the registry, but now
> > that's almost 3 years ago).  It was equally revealing to see some
> > example attempts to populate the LMAP Information Model, so we had a
> > rather productive LMAP interim meeting, all in all.
> >
> > you wrote:
> >> So, in terms of the registry document i.e.
> >> draft-ietf-ippm-metric-registry i understand we have a few options:
> >>
> >> - leave it as it is, as it seems to support all the considered
> >> options
> >> - include some guidelines about how to handle this particular issue,
> >> or at least describing the 3 options above to handle it
> >> - mandate an encoding
> >>
> >> I wouldnt go for the last option.
> >> I am fine with either of the first two.
> > I agree to avoid a mandated encoding, but I think this is an area of
> > potential incompatibility, therefore:
> >
> > In the registry Draft:
> > * I'm in favor of providing guidelines, particularly describing the
> > two formats which have been suggested: Binary and something compatible
> > with YANG. If both are present, we could make the units and resolution
> > equivalent.
> >
> > * If others agree it is useful to provide both, then we provide a
> > Fixed parameter to select a format, with a binary format and a format
> > and a YANG/human-readable format, plus 3rd possibility to indicate a
> > locally-agreed format not mentioned in the registry entry?
> >
> > that's where I end-up,
> > Al
> >
> >> -----Original Message-----
> >> From: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]
> >> Sent: Monday, October 12, 2015 3:34 AM
> >> To: ippm@ietf.org; MORTON, ALFRED C (AL); Juergen Schoenwaelder
> >> Subject: Re: [ippm] metric registry data formats
> >>
> >> Hi,
> >>
> >> I am a bit confused about this comment and the follow up discussion.
> >>
> >> Are you guys talking about draft-ietf-ippm-metric-registry-04 or
> >> about draft-morton-ippm-initial-registry-00?
> >>
> >> The registry is defined in draft-ietf-ippm-metric-registry-04 and
> >> afaict it does not define any data encoding, does it?
> >>
> >> If this is the case, then i think the registry definition already
> >> fullfills what Juergen and Barbara are asking for?
> >>
> >> Now, draft-morton-ippm-initial-registry-00 does defines the data
> >> format for the different parameters. I think we have a few options
> here.
> >> - either each registry entry defines the data format (not required
> >> nor prevented by the current registry format document), which would
> >> imply that two metrics with everything the same except for the data
> >> format would be two different entries in the registry. This may be
> >> reasonable, since if what we want is to guarantee interoperability,
> >> the data format used by the MA and the cotnroller must be the same
> >> and using two different formats should result in different entries.
> >> - either the registry entries do not define any format and it is up
> >> to the involved parties to make sure they use the same format, which
> >> is allowed by the current registry format.
> >> - either to add the fixed parameter Al was suggesting describing the
> >> format used in thei particular entry. This again is supported by the
> >> registry.
> >>
> >> So, in terms of the registry document i.e.
> >> draft-ietf-ippm-metric-registry i understand we have a few options:
> >>
> >> - leave it as it is, as it seems to support all the considered
> >> options
> >> - include some guidelines about how to handle this particular issue,
> >> or at least describing the 3 options above to handle it
> >> - mandate an encoding
> >>
> >> I wouldnt go for the last option.
> >> I am fine with either of the first two.
> >>
> >> Opinions?
> >>
> >> regards, marcelo
> >>
> >>
> >>
> >> El 30/09/15 a las 12:27, Juergen Schoenwaelder escribi=F3:
> >>> Hi,
> >>>
> >>> the metrics registry seems to mandate data encoding. For example,
> >>> entries say that an IPv4 address is a 32 bit unsigned integer or
> >>> that a timestampe is to be represented as a specific NTP encoding.
> >>> The general assumption here seems to be that metric parameters (and
> >>> outputs) are encoded in binary formats. Given that LMAP intends to
> >>> use the metrics registry with protocols that use XML or JSON as
> >>> their encoding, it seems kind of odd to represent parameters in
> >>> binary (which essentially leads to base64 encoded values).
> >>>
> >>> My proposal would be that the metrics registry entries instead
> >>> define clearly what the parameters are and what the precision
> >>> requirements are but that they leave the encoding details to users
> of the registry.
> >>> I would also be fine if there are specific suggestions, e.g., for
> >>> use with YANG, the IP address parameters are represented as an
> >>> ip-address as defined in RFC 6991. Or anything in between is fine -
> >>> I just would dislike to configure parameters in binary base64
> encoded values.
> >>>
> >>> /js
> >>>
> >


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To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, marcelo bagnulo braun <marcelo@it.uc3m.es>, "STARK, BARBARA H" <bs7652@att.com>, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
References: <20150930102916.GB1699@elstar.local> <2D09D61DDFA73D4C884805CC7865E6113AA2F9D7@GAALPA1MSGUSRBF.ITServices.sbc.com> <20151001075926.GB27679@elstar.local> <2D09D61DDFA73D4C884805CC7865E6113AA36385@GAALPA1MSGUSRBF.ITServices.sbc.com> <4AF73AA205019A4C8A1DDD32C034631D0BB4842D43@NJFPSRVEXG0.research.att.com> <561B6974.5060902@it.uc3m.es> <4AF73AA205019A4C8A1DDD32C034631D0BB67F935E@NJFPSRVEXG0.research.att.com> <56209FB2.8030900@it.uc3m.es> <4AF73AA205019A4C8A1DDD32C034631D0BB67F936F@NJFPSRVEXG0.research.att.com>
From: marcelo bagnulo braun <marcelo@it.uc3m.es>
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Subject: Re: [ippm] metric registry parameter names
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ok, i made this change and i also made a similar change for the sampling 
distribution, that may also require parameters

El 16/10/15 a las 13:32, MORTON, ALFRED C (AL) escribió:
> more in-line... [ACM}
>
>> -----Original Message-----
>> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of marcelo bagnulo
>> braun
>> Sent: Friday, October 16, 2015 2:57 AM
> ...
>>> This section needs to include the reference to the stream generation
>>> method, and that's usually where the stream parameters will be
>> defined.
>>> For Poisson, it's RFC 2330. For Periodic, it's RFC 3432.
>>>
>>> AND, the parameters ONLY appear in the Fixed Parameters section,
>>>        OR in the Run-time Parameters section.
>>
>> i can understand that
>> but the streams do have associated parameters that need to be
>> provisioned These can be provisioned in the fixed or run time parameters
>> i agree.
> [ACM]
> Good, thanks!
>
>
>
>>> It would be redundant to have the parameters in Two sections, right?
>>>
>>> So I suggest:
>>>
>>> Packet Stream Generation <note word re-ordering, reads better to me>
>>>
>>>      This section gives the Reference Method for generating the packet
>> traffic that is the
>>>      basis for measurement.  For IPPM metrics, this is called the
>> Stream,
>>>      and can easily be described by citing one of the relevant RFCs and
>>>      any specific details, such as the selected method among several
>>>      alternatives.
>> I would add something along these lines. The packet generation stream
>> may require parameters such as the the average packet rate and
>> distribution truncation value for streams with Poisson-distributed
>> inter-packet sending times. In case such parameters are needed, they
>> should be included either in the Fixed parmaeter column or in the run
>> time parameter column, depending on whehter they will be fixed or will
>> be an input for the metric.
>>
>> would that make sense?
> [ACM]
> Yes, I like it, thanks!
>
> Al
>
>
>
>
>
>>> For what it's worth, I plan to revise section 4 of the initial
>> contents draft:
>>> https://tools.ietf.org/html/draft-morton-ippm-initial-registry-00#sect
>>> ion-4
>>>
>>> and when we have agreement on the comments that have been raised in
>>> the last few weeks, I'll go back and bring the rest of the sections
>> into sync.
>>> regards,
>>> Al
>>>
>>>> -----Original Message-----
>>>> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of marcelo
>>>> bagnulo braun
>>>> Sent: Monday, October 12, 2015 4:04 AM
>>>> To: MORTON, ALFRED C (AL); STARK, BARBARA H; Juergen Schoenwaelder
>>>> Cc: ippm@ietf.org
>>>> Subject: Re: [ippm] metric registry parameter names
>>>>
>>>> So, trying to wrap this one.
>>>> I suggest to add:
>>>>
>>>> In the fixed parameter section, the following text:
>>>>
>>>> In any case, Parameters MUST have well defined names.
>>>> For Human readers, the hanging indent style will work, and the names
>>>> and definitions that do not appear in the Reference Method
>>>> Specification should appear in this column.
>>>>
>>>> In the Packet Generation Stream section, it now reads:
>>>>
>>>> <t>Stream Parameters: The names, values and formats of input factors
>>>> for each type of stream. For example, the average packet rate and
>>>> distribution truncation value for streams with Poisson-distributed
>>>> inter-packet sending times.</t>
>>>>
>>>> In the Sampling distribution section:
>>>>
>>>> <t>Parameters: The names, values and formats of parameters, if
>>>> any.</t>
>>>>
>>>> In the run time parameters section:
>>>>
>>>> <t>Parameters MUST have well defined names.
>>>> For Human readers, the hanging indent style will work, and the names
>>>> and definitions that do not appear in the Reference Method
>>>> Specification should appear in this column</t>
>>>>
>>>> would this address this issue?
>>>>
>>>> Regards, marcelo
>>>>
>>>>
>>>>
>>>>
>>>> El 02/10/15 a las 05:00, MORTON, ALFRED C (AL) escribió:
>>>>> Hi Barbara and Juergen,
>>>>>
>>>>> I'm sorry to join in late (and at late hours).
>>>>> Here's what I take away as additional considerations or requirements
>>>>> for the registry format (which must be reflected in the initial
>>>>> entries, of course):
>>>>>
>>>>> Parameters (Fixed and Run-time) MUST have well defined names.
>>>>> For Human readers, the hanging indent style will work, and the names
>>>>> and definitions that do not appear in the Reference Method
>>>>> Specification should appear in that column, with other additional
>>>>> details.
>>>>>
>>>>> Now, some other items (possibly) needing discussion/contribution:
>>>>>
>>>>> The example,
>>>>> Act_IP_UDP_Round-trip_Delay_Raw_95th-percentile_Poisson,
>>>>> includes requirements on the UDP Payload, that it contain a sequence
>>>>> number, a time stamp, and padding. This aspect of the Fixed
>>>>> parameters is a hold-over from our earliest examples and drafts.
>>>>> I suggest:
>>>>>     - noting that the Reference Method requires sequence numbers to
>>>>>       establish packet correspondence.
>>>>>     - noting that the chosen measurement protocol will dictate the
>>>> format of
>>>>>       sequence numbers and time-stamps, if they are conveyed in the
>>>> packet.
>>>>>     - providing the payload size in octets as a Fixed parameter.
>>>>> The sequence numbers or timestamps are not Run-time parameters.
>>>>> They must be determined by the measurement process itself after the
>>>>> Fixed and Runtime parameters are passed to that process.
>>>>>
>>>>> Also, in the Act_IP_UDP_Round-trip_Delay_Raw_95th-percentile_Poisson
>>>>> example (and others that were copied from this one, I somehow
>>>>> reversed the meaning of lambda when attempting to provide a simple
>>>>> data format (NTP short format, 32 bit), I couldn't format lambda
>>>>> easily as a rate, so went for 1/lambda as a time (and the
>>>>> corresponding edits were
>>>> screwed-up == thanks for catching that Barbara).
>>>>> Default values for Run-time parameters: IPPM has never attempted to
>>>>> agree on defaults, for 1/lambda, for example.  From the earliest
>>>>> comparisons (1998?), RIPE and Advanced didn't use the same values
>>>>> for lambda.  Also, some Run-time parameters (Source IP address)
>>>>> cannot have meaningful defaults.  So, I propose that parameters are
>>>>> either
>>>> Fixed (with values) or Run-time (no value).
>>>>> Automation/Machine parsing: We discussed this in Dallas, and I
>>>>> listened to the recording again last night. In the exchange between
>>>>> Marcelo and Barbara, I think there was agreement (for someone) to
>>>> propose a JSON format for Fixed Parameters.
>>>>> Today, Barbara expressed an interest in Index, URI, Fixed, Run-time,
>>>>> and some field under the Output category to be highly machine parse-
>>>> able.
>>>>> I'd like to be sure that some machine is actually going to read all
>>>>> this material. We started the registry assuming that human
>>>>> implementers would need to read the entries. If there's a use case
>>>>> where machines access the registry themselves, whenever they need
>>>>> to,
>>>> I'm interested to hear about it.
>>>>> "I, for one, welcome our new computer overlords." ;-/
>>>>>
>>>>> Last for this thread: Naming conventions, with word separation.
>>>>> Please make some referenceable suggestions: I don't think we
>>>>> need/want to create anything new.
>>>>>
>>>>> Last^2: It was clear to me that Barbara did some extensive
>>>>> background reading into IPPM's literature/RFCs. Welcome to IPPM,
>>>>> Barbara, you're one of us now.
>>>>>
>>>>> regards,
>>>>> Al
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> -----Original Message-----
>>>>>> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of STARK,
>>>>>> BARBARA H
>>>>>> Sent: Thursday, October 01, 2015 11:30 AM
>>>>>> To: Juergen Schoenwaelder
>>>>>> Cc: ippm@ietf.org
>>>>>> Subject: Re: [ippm] metric registry parameter names
>>>>>>
>>>>>> *** Security Advisory: This Message Originated Outside of AT&T ***.
>>>>>> Reference http://cso.att.com/EmailSecurity/IDSP.html for more
>>>>>> information.
>>>>>>
>>>>>>> The quoting is perhaps helpful but still subtle. I would rather
>>>>>>> have something like this (inspired by good old man pages):
>>>>>>>
>>>>>>> The following parameters are defined and/or provided default
>>>>>>> values
>>>>>>> here:
>>>>>>>
>>>>>>>     upper-limit: The upper-limit defines the time limit on Poisson
>>>>>>>                  distribution (values above this limit will be
>> clipped
>>>>>>>                  and set to the limit value). Default of the upper-
>>>> limit
>>>>>>>                  is 30 seconds.
>>>>>>>
>>>>>>>     seq-num:     The seq-num is an 8-byte field inside the payload
>> of
>>>> the
>>>>>>>                  test packet. The source host shall set the initial
>>>> value
>>>>>>>                  of seq_num in the payload of the first test packet
>>>> and
>>>>>>>                  increment it by 1 with each subsequent test
>> packet.
>>>>>>>     timestamp:   The timestamp is an 8 byte field inside the
>> payload
>>>>>>>                  of the test packet. The source host shall set the
>>>>>>> 	      timestamp value in each test packet payload.
>>>>>> In the Reference Definition where additional parameters are
>>>>>> defined, I think this makes sense. BTW, I've been thinking about
>>>>>> the default for parameters defined inside a registry entry, and
>>>>>> think this probably does need to also be provided in the Run-time
>>>>>> Parameters field. I could envision different registry entries that
>>>>>> reference the same RFC using different defaults for registry-
>> defined parameters.
>>>>>>> [...]
>>>>>>>
>>>>>>> For automation, it would be nice to have a machine readable format
>>>>>>> that might also indicate other aspects such as data type and units
>>>>>>> or precision where they make sense. But a rendering such as shown
>>>>>>> above makes it easy for developers to identify the set of options
>>>>>>> and to lookup specific definitions.
>>>>>> I would like for Identifier, URI, Run-time Parameters, Fixed
>>>>>> Parameters, and some field under Output to be highly
>>>>>> machine-readable/parsable. I was actually wondering if we could
>>>>>> just use JSON format for the parameter and output fields that need
>>>>>> to be parsable. My expectation is that a developer would be able to
>>>>>> code a single executable for all registry entries with URI starting
>>>>>> with
>>>>>> "urn:ietf:params:performance:metric:Act_IP_UDP_Periodic-var_UDP-Pay
>>>>>> lo
>>>>>> ad- 142_One-way_Delay" (see section 7 of
>>>>>> draft-morton-ippm-initial-registry
>>>>>> for this example). The Controller (or whatever configures the
>>>>>> Controller) could get the fixed and default parameter values from
>>>>>> the registry entry in order to set these in the MA (for a
>>>>>> measurement
>>>> task).
>>>>>> In looking at this particular example, that would also suggest that
>>>>>> output-type (which can be "raw" or "summary") and calculation
>>>>>> (which can be "Percentile95", "Mean", "Min", "Max", or "Std_Dev")
>>>>>> need to be provided either as Fixed Parameters or as Output
>>>>>>      Paramet
>>>>>>     ers defined in an Output category column.
>>>>>>
>>>>>>> PS: I personally prefer to not use underscores but dashes instead
>>>> (the
>>>>>>>        command line tools on Unix-like systems I am familiar with
>>>>>>> tend
>>>> to
>>>>>>>        use dashes instead of underscores).
>>>>>> I'm not particular. As long as there are rules/conventions. I would
>>>>>> prefer if we just pick some existing well-defined rules/conventions
>>>>>> and point to them for the fields that need to be parsable. The
>>>>>> other fields do also need conventions (like man pages) to make them
>>>>>> easily human readable. I'll gladly support any commonly-used
>> convention.
>>>>>> Barbara
>>>>>>
>>>>>> _______________________________________________
>>>>>> 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
>>>>>
>>>>>
>>>> _______________________________________________
>>>> 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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To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, marcelo bagnulo braun <marcelo@it.uc3m.es>, "ippm@ietf.org" <ippm@ietf.org>, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
References: <20150930102741.GA1699@elstar.local> <561B625E.8020105@it.uc3m.es> <4AF73AA205019A4C8A1DDD32C034631D0BB67F9360@NJFPSRVEXG0.research.att.com> <56209E7B.2060409@it.uc3m.es> <4AF73AA205019A4C8A1DDD32C034631D0BB67F9370@NJFPSRVEXG0.research.att.com>
From: marcelo bagnulo braun <marcelo@it.uc3m.es>
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Date: Sat, 17 Oct 2015 09:01:52 +0200
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Subject: Re: [ippm] metric registry data formats
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I was thinking about this a little more and i was wondering if it 
wouldnt be better to say something like this:

Parameters MUST have a well defined data encoding for their values. For 
example, parameters that include an IPv4 address can be encoded as a 32 
bit integer (i.e. binary base64 encoded value) or ip-address as defined 
in RFC 6991. The actual encoding(s) used should be explicitly defined 
for each Run-time parameter.

(the motivation is that the encoding may be specific to the specific 
parameter, so a single encoding parameter to define the encoding of all 
parameters wouldnt work, i think)

I am wondering if we should say the same thing for outputs, i think we 
should, no?


El 16/10/15 a las 13:36, MORTON, ALFRED C (AL) escribió:
> I did, but now I see that this needs to be a *Run-time*
> parameter, of course! (this was the last message I sent last
> night, sorry).
>
> It is a way to cover the most popular choice of output,
> without expanding the registry with an entry for each format.
>
> Al
>
>> -----Original Message-----
>> From: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]
>> Sent: Friday, October 16, 2015 2:52 AM
>> To: MORTON, ALFRED C (AL); marcelo bagnulo braun; ippm@ietf.org; Juergen
>> Schoenwaelder
>> Subject: Re: [ippm] metric registry data formats
>>
>> Hi Al,
>>
>> Basically you are suggesting to include a fixed parameter that is the
>> data encoding for all input parameters and probably for all outputs, is
>> that so?
>>
>> Regards, marcelo
>>
>>
>> El 16/10/15 a las 02:06, MORTON, ALFRED C (AL) escribió:
>>> Hi Marcelo,
>>>
>>> All the data format comments were precipitated by a review of
>>> draft-morton-ippm-initial-registry-00, which provided the examples of
>>> the registry entries Juergen sought.  I was very happy to get some
>>> review of draft-morton-ippm-initial-registry-00.
>>> All our descriptions are a bit abstract until we provide some examples
>>> (we had some examples in our first version of the registry, but now
>>> that's almost 3 years ago).  It was equally revealing to see some
>>> example attempts to populate the LMAP Information Model, so we had a
>>> rather productive LMAP interim meeting, all in all.
>>>
>>> you wrote:
>>>> So, in terms of the registry document i.e.
>>>> draft-ietf-ippm-metric-registry i understand we have a few options:
>>>>
>>>> - leave it as it is, as it seems to support all the considered
>>>> options
>>>> - include some guidelines about how to handle this particular issue,
>>>> or at least describing the 3 options above to handle it
>>>> - mandate an encoding
>>>>
>>>> I wouldnt go for the last option.
>>>> I am fine with either of the first two.
>>> I agree to avoid a mandated encoding, but I think this is an area of
>>> potential incompatibility, therefore:
>>>
>>> In the registry Draft:
>>> * I'm in favor of providing guidelines, particularly describing the
>>> two formats which have been suggested: Binary and something compatible
>>> with YANG. If both are present, we could make the units and resolution
>>> equivalent.
>>>
>>> * If others agree it is useful to provide both, then we provide a
>>> Fixed parameter to select a format, with a binary format and a format
>>> and a YANG/human-readable format, plus 3rd possibility to indicate a
>>> locally-agreed format not mentioned in the registry entry?
>>>
>>> that's where I end-up,
>>> Al
>>>
>>>> -----Original Message-----
>>>> From: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]
>>>> Sent: Monday, October 12, 2015 3:34 AM
>>>> To: ippm@ietf.org; MORTON, ALFRED C (AL); Juergen Schoenwaelder
>>>> Subject: Re: [ippm] metric registry data formats
>>>>
>>>> Hi,
>>>>
>>>> I am a bit confused about this comment and the follow up discussion.
>>>>
>>>> Are you guys talking about draft-ietf-ippm-metric-registry-04 or
>>>> about draft-morton-ippm-initial-registry-00?
>>>>
>>>> The registry is defined in draft-ietf-ippm-metric-registry-04 and
>>>> afaict it does not define any data encoding, does it?
>>>>
>>>> If this is the case, then i think the registry definition already
>>>> fullfills what Juergen and Barbara are asking for?
>>>>
>>>> Now, draft-morton-ippm-initial-registry-00 does defines the data
>>>> format for the different parameters. I think we have a few options
>> here.
>>>> - either each registry entry defines the data format (not required
>>>> nor prevented by the current registry format document), which would
>>>> imply that two metrics with everything the same except for the data
>>>> format would be two different entries in the registry. This may be
>>>> reasonable, since if what we want is to guarantee interoperability,
>>>> the data format used by the MA and the cotnroller must be the same
>>>> and using two different formats should result in different entries.
>>>> - either the registry entries do not define any format and it is up
>>>> to the involved parties to make sure they use the same format, which
>>>> is allowed by the current registry format.
>>>> - either to add the fixed parameter Al was suggesting describing the
>>>> format used in thei particular entry. This again is supported by the
>>>> registry.
>>>>
>>>> So, in terms of the registry document i.e.
>>>> draft-ietf-ippm-metric-registry i understand we have a few options:
>>>>
>>>> - leave it as it is, as it seems to support all the considered
>>>> options
>>>> - include some guidelines about how to handle this particular issue,
>>>> or at least describing the 3 options above to handle it
>>>> - mandate an encoding
>>>>
>>>> I wouldnt go for the last option.
>>>> I am fine with either of the first two.
>>>>
>>>> Opinions?
>>>>
>>>> regards, marcelo
>>>>
>>>>
>>>>
>>>> El 30/09/15 a las 12:27, Juergen Schoenwaelder escribió:
>>>>> Hi,
>>>>>
>>>>> the metrics registry seems to mandate data encoding. For example,
>>>>> entries say that an IPv4 address is a 32 bit unsigned integer or
>>>>> that a timestampe is to be represented as a specific NTP encoding.
>>>>> The general assumption here seems to be that metric parameters (and
>>>>> outputs) are encoded in binary formats. Given that LMAP intends to
>>>>> use the metrics registry with protocols that use XML or JSON as
>>>>> their encoding, it seems kind of odd to represent parameters in
>>>>> binary (which essentially leads to base64 encoded values).
>>>>>
>>>>> My proposal would be that the metrics registry entries instead
>>>>> define clearly what the parameters are and what the precision
>>>>> requirements are but that they leave the encoding details to users
>> of the registry.
>>>>> I would also be fine if there are specific suggestions, e.g., for
>>>>> use with YANG, the IP address parameters are represented as an
>>>>> ip-address as defined in RFC 6991. Or anything in between is fine -
>>>>> I just would dislike to configure parameters in binary base64
>> encoded values.
>>>>> /js
>>>>>
>


From nobody Sat Oct 17 05:33:04 2015
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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: marcelo bagnulo braun <marcelo@it.uc3m.es>, "ippm@ietf.org" <ippm@ietf.org>, Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
Date: Sat, 17 Oct 2015 08:28:17 -0400
Thread-Topic: [ippm] metric registry data formats
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References: <20150930102741.GA1699@elstar.local> <561B625E.8020105@it.uc3m.es> <4AF73AA205019A4C8A1DDD32C034631D0BB67F9360@NJFPSRVEXG0.research.att.com> <56209E7B.2060409@it.uc3m.es> <4AF73AA205019A4C8A1DDD32C034631D0BB67F9370@NJFPSRVEXG0.research.att.com> <5621F260.2070507@it.uc3m.es>
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Subject: Re: [ippm] metric registry data formats
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Hi Marcelo,

Yes, that's exactly right, Outputs MUST have well-defined encoding for
their values. That's what I did in the registry contents draft.

The mission here is to be specific, and avoid ambiguity.
thanks,
Al

> -----Original Message-----
> From: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]
> Sent: Saturday, October 17, 2015 3:02 AM
> To: MORTON, ALFRED C (AL); marcelo bagnulo braun; ippm@ietf.org; Juergen
> Schoenwaelder
> Subject: Re: [ippm] metric registry data formats
>=20
> I was thinking about this a little more and i was wondering if it
> wouldnt be better to say something like this:
>=20
> Parameters MUST have a well defined data encoding for their values. For
> example, parameters that include an IPv4 address can be encoded as a 32
> bit integer (i.e. binary base64 encoded value) or ip-address as defined
> in RFC 6991. The actual encoding(s) used should be explicitly defined
> for each Run-time parameter.
>=20
> (the motivation is that the encoding may be specific to the specific
> parameter, so a single encoding parameter to define the encoding of all
> parameters wouldnt work, i think)
>=20
> I am wondering if we should say the same thing for outputs, i think we
> should, no?
>=20
>=20
> El 16/10/15 a las 13:36, MORTON, ALFRED C (AL) escribi=F3:
> > I did, but now I see that this needs to be a *Run-time*
> > parameter, of course! (this was the last message I sent last
> > night, sorry).
> >
> > It is a way to cover the most popular choice of output,
> > without expanding the registry with an entry for each format.
> >
> > Al
> >
> >> -----Original Message-----
> >> From: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]
> >> Sent: Friday, October 16, 2015 2:52 AM
> >> To: MORTON, ALFRED C (AL); marcelo bagnulo braun; ippm@ietf.org;
> Juergen
> >> Schoenwaelder
> >> Subject: Re: [ippm] metric registry data formats
> >>
> >> Hi Al,
> >>
> >> Basically you are suggesting to include a fixed parameter that is the
> >> data encoding for all input parameters and probably for all outputs,
> is
> >> that so?
> >>
> >> Regards, marcelo
> >>
> >>
> >> El 16/10/15 a las 02:06, MORTON, ALFRED C (AL) escribi=F3:
> >>> Hi Marcelo,
> >>>
> >>> All the data format comments were precipitated by a review of
> >>> draft-morton-ippm-initial-registry-00, which provided the examples
> of
> >>> the registry entries Juergen sought.  I was very happy to get some
> >>> review of draft-morton-ippm-initial-registry-00.
> >>> All our descriptions are a bit abstract until we provide some
> examples
> >>> (we had some examples in our first version of the registry, but now
> >>> that's almost 3 years ago).  It was equally revealing to see some
> >>> example attempts to populate the LMAP Information Model, so we had a
> >>> rather productive LMAP interim meeting, all in all.
> >>>
> >>> you wrote:
> >>>> So, in terms of the registry document i.e.
> >>>> draft-ietf-ippm-metric-registry i understand we have a few options:
> >>>>
> >>>> - leave it as it is, as it seems to support all the considered
> >>>> options
> >>>> - include some guidelines about how to handle this particular
> issue,
> >>>> or at least describing the 3 options above to handle it
> >>>> - mandate an encoding
> >>>>
> >>>> I wouldnt go for the last option.
> >>>> I am fine with either of the first two.
> >>> I agree to avoid a mandated encoding, but I think this is an area of
> >>> potential incompatibility, therefore:
> >>>
> >>> In the registry Draft:
> >>> * I'm in favor of providing guidelines, particularly describing the
> >>> two formats which have been suggested: Binary and something
> compatible
> >>> with YANG. If both are present, we could make the units and
> resolution
> >>> equivalent.
> >>>
> >>> * If others agree it is useful to provide both, then we provide a
> >>> Fixed parameter to select a format, with a binary format and a
> format
> >>> and a YANG/human-readable format, plus 3rd possibility to indicate a
> >>> locally-agreed format not mentioned in the registry entry?
> >>>
> >>> that's where I end-up,
> >>> Al
> >>>
> >>>> -----Original Message-----
> >>>> From: marcelo bagnulo braun [mailto:marcelo@it.uc3m.es]
> >>>> Sent: Monday, October 12, 2015 3:34 AM
> >>>> To: ippm@ietf.org; MORTON, ALFRED C (AL); Juergen Schoenwaelder
> >>>> Subject: Re: [ippm] metric registry data formats
> >>>>
> >>>> Hi,
> >>>>
> >>>> I am a bit confused about this comment and the follow up
> discussion.
> >>>>
> >>>> Are you guys talking about draft-ietf-ippm-metric-registry-04 or
> >>>> about draft-morton-ippm-initial-registry-00?
> >>>>
> >>>> The registry is defined in draft-ietf-ippm-metric-registry-04 and
> >>>> afaict it does not define any data encoding, does it?
> >>>>
> >>>> If this is the case, then i think the registry definition already
> >>>> fullfills what Juergen and Barbara are asking for?
> >>>>
> >>>> Now, draft-morton-ippm-initial-registry-00 does defines the data
> >>>> format for the different parameters. I think we have a few options
> >> here.
> >>>> - either each registry entry defines the data format (not required
> >>>> nor prevented by the current registry format document), which would
> >>>> imply that two metrics with everything the same except for the data
> >>>> format would be two different entries in the registry. This may be
> >>>> reasonable, since if what we want is to guarantee interoperability,
> >>>> the data format used by the MA and the cotnroller must be the same
> >>>> and using two different formats should result in different entries.
> >>>> - either the registry entries do not define any format and it is up
> >>>> to the involved parties to make sure they use the same format,
> which
> >>>> is allowed by the current registry format.
> >>>> - either to add the fixed parameter Al was suggesting describing
> the
> >>>> format used in thei particular entry. This again is supported by
> the
> >>>> registry.
> >>>>
> >>>> So, in terms of the registry document i.e.
> >>>> draft-ietf-ippm-metric-registry i understand we have a few options:
> >>>>
> >>>> - leave it as it is, as it seems to support all the considered
> >>>> options
> >>>> - include some guidelines about how to handle this particular
> issue,
> >>>> or at least describing the 3 options above to handle it
> >>>> - mandate an encoding
> >>>>
> >>>> I wouldnt go for the last option.
> >>>> I am fine with either of the first two.
> >>>>
> >>>> Opinions?
> >>>>
> >>>> regards, marcelo
> >>>>
> >>>>
> >>>>
> >>>> El 30/09/15 a las 12:27, Juergen Schoenwaelder escribi=F3:
> >>>>> Hi,
> >>>>>
> >>>>> the metrics registry seems to mandate data encoding. For example,
> >>>>> entries say that an IPv4 address is a 32 bit unsigned integer or
> >>>>> that a timestampe is to be represented as a specific NTP encoding.
> >>>>> The general assumption here seems to be that metric parameters
> (and
> >>>>> outputs) are encoded in binary formats. Given that LMAP intends to
> >>>>> use the metrics registry with protocols that use XML or JSON as
> >>>>> their encoding, it seems kind of odd to represent parameters in
> >>>>> binary (which essentially leads to base64 encoded values).
> >>>>>
> >>>>> My proposal would be that the metrics registry entries instead
> >>>>> define clearly what the parameters are and what the precision
> >>>>> requirements are but that they leave the encoding details to users
> >> of the registry.
> >>>>> I would also be fine if there are specific suggestions, e.g., for
> >>>>> use with YANG, the IP address parameters are represented as an
> >>>>> ip-address as defined in RFC 6991. Or anything in between is fine
> -
> >>>>> I just would dislike to configure parameters in binary base64
> >> encoded values.
> >>>>> /js
> >>>>>
> >


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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the IP Performance Metrics Working Group of the IETF.

        Title           : Registry for Performance Metrics
        Authors         : Marcelo Bagnulo
                          Benoit Claise
                          Philip Eardley
                          Al Morton
                          Aamer Akhter
	Filename        : draft-ietf-ippm-metric-registry-05.txt
	Pages           : 27
	Date            : 2015-10-18

Abstract:
   This document defines the format for the Performance Metrics registry
   and defines the IANA Registry for Performance Metrics.  This document
   also gives a set of guidelines for Registered Performance Metric
   requesters and reviewers.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ippm-metric-registry/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-ippm-metric-registry-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ippm-metric-registry-05


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

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


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Hi,

We have submitted a new version of the draft. We believe this version 
addresses the comments raised by Barbara and Juergen.
We think the draft is ready for WGLC.

Regards, marcelo



-------- Mensaje reenviado --------
Asunto: 	I-D Action: draft-ietf-ippm-metric-registry-05.txt
Fecha: 	Sun, 18 Oct 2015 00:08:21 -0700
De: 	internet-drafts@ietf.org
Responder a: 	internet-drafts@ietf.org
Para: 	i-d-announce@ietf.org
CC: 	ippm@ietf.org



A New Internet-Draft is available from the on-line Internet-Drafts directories.
  This draft is a work item of the IP Performance Metrics Working Group of the IETF.

         Title           : Registry for Performance Metrics
         Authors         : Marcelo Bagnulo
                           Benoit Claise
                           Philip Eardley
                           Al Morton
                           Aamer Akhter
	Filename        : draft-ietf-ippm-metric-registry-05.txt
	Pages           : 27
	Date            : 2015-10-18

Abstract:
    This document defines the format for the Performance Metrics registry
    and defines the IANA Registry for Performance Metrics.  This document
    also gives a set of guidelines for Registered Performance Metric
    requesters and reviewers.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ippm-metric-registry/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-ippm-metric-registry-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ippm-metric-registry-05


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

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

_______________________________________________
I-D-Announce mailing list
I-D-Announce@ietf.org
https://www.ietf.org/mailman/listinfo/i-d-announce
Internet-Draft directories: http://www.ietf.org/shadow.html
or ftp://ftp.ietf.org/ietf/1shadow-sites.txt





From nobody Sun Oct 18 01:38:24 2015
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Greetings, all,

This message starts Working Group Last Call on =
draft-ietf-ippm-metric-registry-05. Given the proximity of this last =
call to the in-person meeting, last call will end on Tuesday, 3 November =
at 15:00 JST (06:00 UTC) at the end of the IPPM meeting in Yokohama.

Please send any final comments on the draft (including "I've read it and =
it's good") to the ippm@ietf.org list.

Many thanks, cheers,

Brian

> On 18 Oct 2015, at 09:10, marcelo bagnulo braun <marcelo@it.uc3m.es> =
wrote:
>=20
> Hi,
>=20
> We have submitted a new version of the draft. We believe this version =
addresses the comments raised by Barbara and Juergen.
> We think the draft is ready for WGLC.
>=20
> Regards, marcelo
>=20
>=20
>=20
> -------- Mensaje reenviado --------
> Asunto: 	I-D Action: draft-ietf-ippm-metric-registry-05.txt
> Fecha: 	Sun, 18 Oct 2015 00:08:21 -0700
> De: 	internet-drafts@ietf.org
> Responder a: 	internet-drafts@ietf.org
> Para: 	i-d-announce@ietf.org
> CC: 	ippm@ietf.org
>=20
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts =
directories.
> This draft is a work item of the IP Performance Metrics Working Group =
of the IETF.
>=20
>        Title           : Registry for Performance Metrics
>        Authors         : Marcelo Bagnulo
>                          Benoit Claise
>                          Philip Eardley
>                          Al Morton
>                          Aamer Akhter
> 	Filename        : draft-ietf-ippm-metric-registry-05.txt
> 	Pages           : 27
> 	Date            : 2015-10-18
>=20
> Abstract:
>   This document defines the format for the Performance Metrics =
registry
>   and defines the IANA Registry for Performance Metrics.  This =
document
>   also gives a set of guidelines for Registered Performance Metric
>   requesters and reviewers.
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-ippm-metric-registry/
>=20
> There's also a htmlized version available at:
> https://tools.ietf.org/html/draft-ietf-ippm-metric-registry-05
>=20
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-ippm-metric-registry-05
>=20
>=20
> Please note that it may take a couple of minutes from the time of =
submission
> until the htmlized version and diff are available at tools.ietf.org.
>=20
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>=20
> _______________________________________________
> I-D-Announce mailing list
> I-D-Announce@ietf.org
> https://www.ietf.org/mailman/listinfo/i-d-announce
> Internet-Draft directories: http://www.ietf.org/shadow.html
> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
>=20
>=20
>=20
>=20
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm


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Subject: Re: [ippm] metric registry url and related format / automation question
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Al,

I got a bit lost in the answer. So is the URL resolving to something
that has some structured data or does it refer to a web page rendered
for human readers? I do not think that measurement tasks residing on
MAs are likely to read registry information but controllers and
applications consuming data pushed to collectors might want to do so.

/js

PS: Yes, thinking about a registry entry as a big table row is scary.
    I would prefer to have an IANA managed table with just the keys
    for the registered metrics (number, name, URN, URL) where the URL
    points to a structured resources that allows tools to process the
    various fields that make up the registered metric entry.

On Mon, Oct 12, 2015 at 09:31:08AM -0400, MORTON, ALFRED C (AL) wrote:
> Hi Juergen,
> I somehow missed this one -- reply to your comment below.
> Al
> > -----Original Message-----
> > From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Juergen
> > Schoenwaelder
> > Sent: Wednesday, September 30, 2015 6:38 AM
> > To: ippm@ietf.org
> > Subject: [ippm] metric registry url and related format / automation
> > question
> > 
> > Hi,
> > 
> > every registry entry has a set of identifiers:
> > 
> > - a number (registry unique)
> > - a (longish) name (registry unique)
> > - a URN (a concatenation of the name with a registry prefix) (globally
> > unique)
> > - a URL to point to something retrivable
> > 
> > The last one seems rather underspecified. Is the URL pointing to a web
> > page that is intended for humans to read about the metric 
> [ACM] 
> Yes, there are several reasons to do this:
> 
> We will have a URL pointing to exactly *one* registry entry. 
> I discussed this possibility with IANA, and they (Amanda) 
> agreed to provide it.
> 
> The separate files can be more easily edited and re-used
> by folks when preparing new entries.
> 
> The separate files can be copied and handed to a developer, 
> "augment the code so it performs this metric". 
> An HTML file could have links to all the references the developer needs,
> like the HTML-versions of Internet Drafts (and the code that generates
> them).
> 
> We have a registry with 4 Summary columns, with the "long-ish name"
> and Description. when you add the nitty-gritty details there are
> about 20 columns and some of the entries will have a lot of text. 
> A table with ~20 columns, some wide, would be difficult to read
> on the screen.
> 
> 
> > ...or is the idea
> > that I get a machine readable version of the registry entry? In the
> > later case, the format would have to be defined somehow. 
> [ACM] 
> No. I think we still need to learn a solid use case 
> and the specific columns that need to be machine parse-able.
> The Fixed parameters column is certainly a candidate based on 
> discussions so far, but how and when in the measurement system
> development process/operation would it be better to have machine 
> parse-able info? Many of our columns contain info that machines 
> would find useless (e.g., Description). 
> 
> > ... I guess the
> > underlying question is whether tools are expected to access the registry
> > in order to for example dynamically learn about the possible parameters
> > (and their data types) for a metric or is the idea that essentially the
> > conversion of the registry content into running code is a manual
> > process?
> [ACM] 
> The development of measurement code is certainly a manual process,
> and those developers are our target users.
> 
> I think the over-arching goal of our registry work is to ensure
> that independent implementations of measurement systems could
> conduct measurements of the same metrics using equivalent methods,
> and produce comparable results -- IOW, two implementations measuring
> identical network conditions would produce statistically equivalent
> results.
> 
> The idea that measurement devices would access any version of registry
> as part of on-going operations never crossed my mind. The possibility
> was something Barbara first mentioned in Dallas this year (and that's
> over two years after some of us started work to define the registry).
> 
> So, it's certainly possible to produce some machine-readable formats.
> Or, for humans other than the registry authors to produce them and
> make them accessible to their measurement system (which could be operating
> in a private address space where the IANA registry is un-reachable).
> 
> What developers plan such dynamic systems that would access the registry
> on an on-going basis?
> 

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <http://www.jacobs-university.de/>


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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
Date: Sun, 18 Oct 2015 09:59:18 -0400
Thread-Topic: [ippm] metric registry url and related format / automation question
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Subject: Re: [ippm] metric registry url and related format / automation question
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Hi Juergen,

The URL points to a web page that is formatted for humans to read.*

I'm sorry to hear that adding the rationale behind this choice
made it less useful to you, though I thought that the "Yes" and "No"
answers to your question describing the human/machine alternatives=20
were unambiguous, at least. :-)  And, I'm glad we agree it's=20
necessary to avoid the super-wide table of entries. This is an
aspect I've been concerned about (and even mocked-up for my=20
co-authors to help make my case for URLs a year ago! as we've
both re-experienced recently: examples help understanding).

>>> WGLC <<<
I also see that we failed to make the "human-readable" aspect clear
in the current text of=20
https://tools.ietf.org/html/draft-ietf-ippm-metric-registry-05#section-7.1.=
3
so, this is a WGLC comment: Please add the first sentence of this message
and possibly the footnote below in section 7.1.3.
>>> /WGLC <<<


you wrote:
> ... I do not think that measurement tasks residing on MAs
> are likely to read registry information but controllers and applications
> consuming data pushed to collectors might want to do so.

Thanks for expressing your perspective! It begins to define the
Use Case(s) for structured data that machines can easily parse.
There's much more input required before we understand the needs,
but if we can agree, then also having a URL to a=20
"machine-parse-able" file could be an optional part of each=20
Registered Metric.

Thanks again for all your comments, especially on:
https://tools.ietf.org/html/draft-morton-ippm-initial-registry-00
(which will be updated shortly).

regards,
Al

* The ideal form of this page is very similar to our HTML-ized
  Internet Drafts, where each RFC/Section# reference is a=20
  hyperlink to the needed material.=20

> -----Original Message-----
> From: Juergen Schoenwaelder [mailto:j.schoenwaelder@jacobs-
> university.de]
> Sent: Sunday, October 18, 2015 5:22 AM
> To: MORTON, ALFRED C (AL)
> Cc: ippm@ietf.org
> Subject: Re: [ippm] metric registry url and related format / automation
> question
>=20
> Al,
>=20
> I got a bit lost in the answer. So is the URL resolving to something
> that has some structured data or does it refer to a web page rendered
> for human readers? I do not think that measurement tasks residing on MAs
> are likely to read registry information but controllers and applications
> consuming data pushed to collectors might want to do so.
>=20
> /js
>=20
> PS: Yes, thinking about a registry entry as a big table row is scary.
>     I would prefer to have an IANA managed table with just the keys
>     for the registered metrics (number, name, URN, URL) where the URL
>     points to a structured resources that allows tools to process the
>     various fields that make up the registered metric entry.
>=20
> On Mon, Oct 12, 2015 at 09:31:08AM -0400, MORTON, ALFRED C (AL) wrote:
> > Hi Juergen,
> > I somehow missed this one -- reply to your comment below.
> > Al
> > > -----Original Message-----
> > > From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Juergen
> > > Schoenwaelder
> > > Sent: Wednesday, September 30, 2015 6:38 AM
> > > To: ippm@ietf.org
> > > Subject: [ippm] metric registry url and related format / automation
> > > question
> > >
> > > Hi,
> > >
> > > every registry entry has a set of identifiers:
> > >
> > > - a number (registry unique)
> > > - a (longish) name (registry unique)
> > > - a URN (a concatenation of the name with a registry prefix)
> > > (globally
> > > unique)
> > > - a URL to point to something retrivable
> > >
> > > The last one seems rather underspecified. Is the URL pointing to a
> > > web page that is intended for humans to read about the metric
> > [ACM]
> > Yes, there are several reasons to do this:
> >
> > We will have a URL pointing to exactly *one* registry entry.
> > I discussed this possibility with IANA, and they (Amanda) agreed to
> > provide it.
> >
> > The separate files can be more easily edited and re-used by folks when
> > preparing new entries.
> >
> > The separate files can be copied and handed to a developer, "augment
> > the code so it performs this metric".
> > An HTML file could have links to all the references the developer
> > needs, like the HTML-versions of Internet Drafts (and the code that
> > generates them).
> >
> > We have a registry with 4 Summary columns, with the "long-ish name"
> > and Description. when you add the nitty-gritty details there are about
> > 20 columns and some of the entries will have a lot of text.
> > A table with ~20 columns, some wide, would be difficult to read on the
> > screen.
> >
> >
> > > ...or is the idea
> > > that I get a machine readable version of the registry entry? In the
> > > later case, the format would have to be defined somehow.
> > [ACM]
> > No. I think we still need to learn a solid use case and the specific
> > columns that need to be machine parse-able.
> > The Fixed parameters column is certainly a candidate based on
> > discussions so far, but how and when in the measurement system
> > development process/operation would it be better to have machine
> > parse-able info? Many of our columns contain info that machines would
> > find useless (e.g., Description).
> >
> > > ... I guess the
> > > underlying question is whether tools are expected to access the
> > > registry in order to for example dynamically learn about the
> > > possible parameters (and their data types) for a metric or is the
> > > idea that essentially the conversion of the registry content into
> > > running code is a manual process?
> > [ACM]
> > The development of measurement code is certainly a manual process, and
> > those developers are our target users.
> >
> > I think the over-arching goal of our registry work is to ensure that
> > independent implementations of measurement systems could conduct
> > measurements of the same metrics using equivalent methods, and produce
> > comparable results -- IOW, two implementations measuring identical
> > network conditions would produce statistically equivalent results.
> >
> > The idea that measurement devices would access any version of registry
> > as part of on-going operations never crossed my mind. The possibility
> > was something Barbara first mentioned in Dallas this year (and that's
> > over two years after some of us started work to define the registry).
> >
> > So, it's certainly possible to produce some machine-readable formats.
> > Or, for humans other than the registry authors to produce them and
> > make them accessible to their measurement system (which could be
> > operating in a private address space where the IANA registry is un-
> reachable).
> >
> > What developers plan such dynamic systems that would access the
> > registry on an on-going basis?
> >
>=20
> --
> Juergen Schoenwaelder           Jacobs University Bremen gGmbH
> Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
> Fax:   +49 421 200 3103         <http://www.jacobs-university.de/>


From nobody Mon Oct 19 10:16:14 2015
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the IP Performance Metrics Working Group of the IETF.

        Title           : Active and Passive Metrics and Methods (and everything in-between, or Hybrid)
        Author          : Al Morton
	Filename        : draft-ietf-ippm-active-passive-02.txt
	Pages           : 14
	Date            : 2015-10-19

Abstract:
   This memo provides clear definitions for Active and Passive
   performance assessment.  The construction of Metrics and Methods can
   be described as Active or Passive.  Some methods may use a subset of
   both active and passive attributes, and we refer to these as Hybrid
   Methods.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ippm-active-passive/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-ippm-active-passive-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ippm-active-passive-02


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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
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Hi Tal and Joachim,

I believe I have addressed your comments in this version.

Thanks very much for your careful reviews and suggestions!

regards,
Al

> -----Original Message-----
> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of internet-
> drafts@ietf.org
> Sent: Monday, October 19, 2015 1:16 PM
> To: i-d-announce@ietf.org
> Cc: ippm@ietf.org
> Subject: [ippm] I-D Action: draft-ietf-ippm-active-passive-02.txt
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
>  This draft is a work item of the IP Performance Metrics Working Group
> of the IETF.
>=20
>         Title           : Active and Passive Metrics and Methods (and
> everything in-between, or Hybrid)
>         Author          : Al Morton
> 	Filename        : draft-ietf-ippm-active-passive-02.txt
> 	Pages           : 14
> 	Date            : 2015-10-19
>=20
> Abstract:
>    This memo provides clear definitions for Active and Passive
>    performance assessment.  The construction of Metrics and Methods can
>    be described as Active or Passive.  Some methods may use a subset of
>    both active and passive attributes, and we refer to these as Hybrid
>    Methods.
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-ippm-active-passive/
>=20
> There's also a htmlized version available at:
> https://tools.ietf.org/html/draft-ietf-ippm-active-passive-02
>=20
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-ippm-active-passive-02
>=20
>=20
> Please note that it may take a couple of minutes from the time of
> submission until the htmlized version and diff are available at
> tools.ietf.org.
>=20
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>=20
> _______________________________________________
> ippm mailing list
> ippm@ietf.org
> https://www.ietf.org/mailman/listinfo/ippm


From nobody Mon Oct 19 12:25:29 2015
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Subject: [ippm] Protocol Action: 'Registries for the One-Way Active Measurement Protocol - OWAMP' to Proposed Standard (draft-ietf-ippm-owamp-registry-03.txt)
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The IESG has approved the following document:
- 'Registries for the One-Way Active Measurement Protocol - OWAMP'
  (draft-ietf-ippm-owamp-registry-03.txt) as Proposed Standard

This document is the product of the IP Performance Metrics Working Group.

The IESG contact persons are Spencer Dawkins and Martin Stiemerling.

A URL of this Internet Draft is:
https://datatracker.ietf.org/doc/draft-ietf-ippm-owamp-registry/





Technical Summary

   This memo describes the registries for OWAMP - the One-Way Active
   Measurement Protocol.  The registries allow assignment of MODE bit
   positions and OWAMP Command numbers.  The memo also requests that
   IANA establish the registries for new features, called the OWAMP-
   Modes registry and the OWAMP Control Command Number registry.  This
   memo updates RFC 4656.

Working Group Summary

   The need for this draft was identified during IESG evaluation
   of draft-ietf-ippm-ipsec. The working group processed it 
   quickly in response to the question the IESG raised.

Document Quality

   There are no implementations (this document defines a 
   registry). 

Personnel

   The document shepherd is Bill Cerveny.  
   The responsible area director is Spencer Dawkins.
   No IANA expert is needed for these registries (the policy is IETF Review).


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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: "draft-ietf-ippm-type-p-monitor.all@tools.ietf.org" <draft-ietf-ippm-type-p-monitor.all@tools.ietf.org>, "ops-dir@ietf.org" <ops-dir@ietf.org>
Date: Mon, 19 Oct 2015 17:13:13 -0400
Thread-Topic: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02
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OPS-DIR, Authors,=20

I have reviewed this document as part of the Operational directorate's=20
ongoing effort to review all IETF documents being processed by the IESG. =20
These comments were written primarily for the benefit of the operational=20
area directors. Document editors and WG chairs should treat these comments=
=20
just like any other last call comments.

Al

Title:
Differentiated Service Code Point and Explicit Congestion Notification
       Monitoring in Two-Way Active Measurement Protocol (TWAMP)
                   draft-ietf-ippm-type-p-monitor-02
https://tools.ietf.org/html/draft-ietf-ippm-type-p-monitor-02

Summary: Almost ready, comments and editorial suggestions follow.

The draft header should indicate that this draft updates RFC 5357.

Section 2.2.1

Figure 1 has a number of canonical references that should=20
be cited to ensure IPv4 and IPv6 applicability, including=20
RFC 2474, RFC 3168, and other relevant updates (of which=20
there are many).

<later>
   o  if the negotiated/provisioned DSCP value is not known (e.g.  TWAMP
      Light), the choice of the DSCP is implementation specific.  For
      instance, Session-Reflector MAY copy the DSCP value from the
      received test packet and set it as DSCP in a reflected packet.
Question:
What about the ECN value?   From 3168:
      +-----+-----+
      | ECN FIELD |
      +-----+-----+
        ECT   CE         [Obsolete] RFC 2481 names for the ECN bits.
         0     0         Not-ECT
         0     1         ECT(1)
         1     0         ECT(0)
         1     1         CE
It makes little sense to copy a "11" =3D=3D CE into the reflected packet,
and it may affect the measured performance if "11" were copied.
The draft needs more guidance here (there is a general problem
when the negotiated values are "not known"; this does not apply=20
to the Standards Track TWAMP protocol or its extensions).

-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-

Editorial comments/suggestions:

OLD
2.2.  TWAMP-Test Extension

   Monitoring of DSCP and ECN requires support by the Session-Reflector
   and changes the format of its test packet format both in
   unauthenticated, authenticated and encrypted modes.=20
Suggest:
   Monitoring of DSCP and ECN requires support by the Session-Reflector
   and changes the test packet format in all the original
   (unauthenticated, authenticated and encrypted) modes.=20

2.2.1

OLD
   o  the first six bits of the Differentiated Service field MUST be
      copied from received Session-Sender test packet into Sender DSCP
      (S-DSCP) field;

   o  the following two bits of the ECN field MUST be copied from
      received Session-Sender test packet into Sender ECN (S-ECN) field.
Suggest:
   o  the six (least-significant) bits of the Differentiated Service field =
MUST be
      copied from received Session-Sender test packet into Sender DSCP
      (S-DSCP) field;

   o  the two bits of the ECN field MUST be copied from
      received Session-Sender test packet into Sender ECN (S-ECN) field.

because RFC 3168 defines:
         0     1     2     3     4     5     6     7
      +-----+-----+-----+-----+-----+-----+-----+-----+
      |          DS FIELD, DSCP           | ECN FIELD |
      +-----+-----+-----+-----+-----+-----+-----+-----+

        DSCP: differentiated services codepoint
        ECN:  Explicit Congestion Notification

      Figure 2: The Differentiated Services and ECN Fields in IP.
-=3D-=3D-=3D-=3D-=3D-=3D-=3D-

OLD
    0     1     2     3     4     5     6     7     8
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |               S-DSCP              |   S-ECN   |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                Figure 1: Sender DSCP and ECN field format

Suggest:
The extra "+" within bit positions are distracting,
and don't conform to the conventions of these diagrams.
Also, there's no "8" when numbering from 0.

Some attempt should be made to put Figure 3 on a single page in the=20
final version. There's one line taken up by "+" that is unnecessary
in the modified field:

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    | Sender TTL  |  S-DSCP-ECN   |                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +
    |                                                             |
 >> +                                                             + <<
    |                       MBZ (14 octets)                       |
    |                                                             |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+




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Date: Mon, 19 Oct 2015 22:12:11 +0000 (UTC)
From: <nalini.elkins@insidethestack.com>
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Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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IPPM, Al, Brian, Joachim,

I have read this draft and support its adoption.

Some comments:

1.  Throughout the document, "a' priori" should be "a priori".

2.  Joachim had made the comment on Sec 4.1 and Sec 4.2 on PDM, while discussing the statement:

"The method may have a small effect on the measured stream and other streams in the network."

Joachim's comments:

>>"Sec. 4.1., 4.2: I fully agree with the categorization. However, is the "small effect" essential for these examples/statement? One could find several cases when the bias onto >>measurements is substantial - anything between a) "packets become too large when adding the PDM header and results in <IPv6-fragementation-required> to the sending host", b) >>"Size increase with PDM header makes stream to exceed a network threshold and trigger channel capacity re-allocation" and c) "subsequent nodes on the path drop these packets because of the measurement node modifications". 

>>All of these actions should result in substantial bias of measurement results. And even the change of field values could result in intermediate nodes to apply distinct forwarding >>policies to the packets."


Indeed, all such can be the case if one is pushing up against the largest packet size on the network or against some type of boundary.  We have been working on our own PDM implementation as well as discussing it with commercial TCP/IP stack developers.  We will discuss this in detail in Yokohama.

On a more general note, I believe that when using hybrid modes, it becomes critical to not trigger such network events by careful implementation and planning.  One thing that I have seen network operators do when they know that they may have extra headers potentially added is to "leave room".  That is, for example, send a normal packet that is 1,430 rather than 1,480. If you have a packet that is 1,480 on a network with a 1,500 MTU, then just about anything you add is going to lead to fragmentation.

I wonder if we need to say something like "Testing needs to be planned carefully so that the impact of additional headers or markings in the packet do not lead to packet bias".
 Thanks,

Nalini Elkins
Inside Products, Inc.
www.insidethestack.com
(831) 659-8360


----- Original Message -----
From: Brian Trammell <ietf@trammell.ch>
To: ippm@ietf.org
Cc: 
Sent: Wednesday, October 7, 2015 3:47 AM
Subject: [ippm] WGLC on draft-ietf-ippm-active-passive-01

Greetings, all,

WG last call on draft-ietf-ippm-active-passive-01 begins today, and will end Wednesday 21 October 2015. Please send any comments (including "I've read it and it's good" :) ) to the ippm@ietf.org list.

Thanks, cheers,

Brian (chair hat)
_______________________________________________
ippm mailing list
ippm@ietf.org
https://www.ietf.org/mailman/listinfo/ippm

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From nobody Mon Oct 19 15:40:49 2015
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Subject: [ippm] Benoit Claise's No Objection on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Benoit Claise has entered the following ballot position for
draft-ietf-ippm-type-p-monitor-02: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

As mentioned by Al Morton, part of his OPS DIR review:

Summary: Almost ready, comments and editorial suggestions follow.

The draft header should indicate that this draft updates RFC 5357.

Section 2.2.1

Figure 1 has a number of canonical references that should 
be cited to ensure IPv4 and IPv6 applicability, including 
RFC 2474, RFC 3168, and other relevant updates (of which 
there are many).

<later>
   o  if the negotiated/provisioned DSCP value is not known (e.g.  TWAMP
      Light), the choice of the DSCP is implementation specific.  For
      instance, Session-Reflector MAY copy the DSCP value from the
      received test packet and set it as DSCP in a reflected packet.
Question:
What about the ECN value?   From 3168:
      +-----+-----+
      | ECN FIELD |
      +-----+-----+
        ECT   CE         [Obsolete] RFC 2481 names for the ECN bits.
         0     0         Not-ECT
         0     1         ECT(1)
         1     0         ECT(0)
         1     1         CE
It makes little sense to copy a "11" == CE into the reflected packet,
and it may affect the measured performance if "11" were copied.
The draft needs more guidance here (there is a general problem
when the negotiated values are "not known"; this does not apply 
to the Standards Track TWAMP protocol or its extensions).

-=-=-=-=-=-=-=-=-=-=-=-=-

Editorial comments/suggestions:

OLD
2.2.  TWAMP-Test Extension

   Monitoring of DSCP and ECN requires support by the Session-Reflector
   and changes the format of its test packet format both in
   unauthenticated, authenticated and encrypted modes. 
Suggest:
   Monitoring of DSCP and ECN requires support by the Session-Reflector
   and changes the test packet format in all the original
   (unauthenticated, authenticated and encrypted) modes. 

2.2.1

OLD
   o  the first six bits of the Differentiated Service field MUST be
      copied from received Session-Sender test packet into Sender DSCP
      (S-DSCP) field;

   o  the following two bits of the ECN field MUST be copied from
      received Session-Sender test packet into Sender ECN (S-ECN) field.
Suggest:
   o  the six (least-significant) bits of the Differentiated Service
field MUST be
      copied from received Session-Sender test packet into Sender DSCP
      (S-DSCP) field;

   o  the two bits of the ECN field MUST be copied from
      received Session-Sender test packet into Sender ECN (S-ECN) field.

because RFC 3168 defines:
         0     1     2     3     4     5     6     7
      +-----+-----+-----+-----+-----+-----+-----+-----+
      |          DS FIELD, DSCP           | ECN FIELD |
      +-----+-----+-----+-----+-----+-----+-----+-----+

        DSCP: differentiated services codepoint
        ECN:  Explicit Congestion Notification

      Figure 2: The Differentiated Services and ECN Fields in IP.
-=-=-=-=-=-=-=-

OLD
    0     1     2     3     4     5     6     7     8
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |               S-DSCP              |   S-ECN   |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                Figure 1: Sender DSCP and ECN field format

Suggest:
The extra "+" within bit positions are distracting,
and don't conform to the conventions of these diagrams.
Also, there's no "8" when numbering from 0.

Some attempt should be made to put Figure 3 on a single page in the 
final version. There's one line taken up by "+" that is unnecessary
in the modified field:

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    | Sender TTL  |  S-DSCP-ECN   |                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +
    |                                                             |
 >> +                                                             + <<
    |                       MBZ (14 octets)                       |
    |                                                             |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: "nalini.elkins@insidethestack.com" <nalini.elkins@insidethestack.com>, Brian Trammell <ietf@trammell.ch>, "ippm@ietf.org" <ippm@ietf.org>
Date: Mon, 19 Oct 2015 18:55:58 -0400
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Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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From nobody Mon Oct 19 16:07:10 2015
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Subject: [ippm] I-D Action: draft-ietf-ippm-model-based-metrics-07.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the IP Performance Metrics Working Group of the IETF.

        Title           : Model Based Metrics for Bulk Transport Capacity
        Authors         : Matt Mathis
                          Al Morton
	Filename        : draft-ietf-ippm-model-based-metrics-07.txt
	Pages           : 49
	Date            : 2015-10-19

Abstract:
   We introduce a new class of Model Based Metrics designed to assess if
   a complete Internet path can be expected to meet a predefined Target
   Transport Performance by applying a suite of IP diagnostic tests to
   successive subpaths.  The subpath-at-a-time tests can be robustly
   applied to key infrastructure, such as interconnects or even
   individual devices, to accurately detect if any part of the
   infrastructure will prevent paths traversing it from meeting the
   Target Transport Performance.

   For Bulk Transport Capacity, the IP diagnostics are built on test
   streams that mimic TCP over the complete path and statistical
   criteria for evaluating the packet transfer statistics of those
   streams.  The temporal structure of the test stream (bursts, etc)
   mimic TCP or other transport protocol carrying bulk data over a long
   path but are constructed to be independent of the details of the
   subpath under test, end systems or applications.  Likewise the
   success criteria evaluates the packet transfer statistics of the
   subpath against criteria determined by protocol performance models
   applied to the Target Transport Performance of the complete path.
   The success criteria also does not depend on the details of the
   subpath, end systems or application.

   Model Based Metrics exhibit several important new properties not
   present in other Bulk Transport Capacity Metrics, including the
   ability to reason about concatenated or overlapping subpaths.  The
   results are vantage independent which is critical for supporting
   independent validation of tests by comparing results from multiple
   measurement points.

   This document does not define the IP diagnostic tests, but provides a
   framework for designing suites of IP diagnostic tests that are
   tailored to confirming that infrastructure can meet the predetermined
   Target Transport Performance.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ippm-model-based-metrics/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-ippm-model-based-metrics-07

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ippm-model-based-metrics-07


Please note that it may take a couple of minutes from the time of submission
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From nobody Mon Oct 19 23:28:18 2015
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To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, "ippm@ietf.org" <ippm@ietf.org>
References: <20151019171612.16692.64264.idtracker@ietfa.amsl.com> <4AF73AA205019A4C8A1DDD32C034631D0BB67F95C7@NJFPSRVEXG0.research.att.com>
From: Joachim Fabini <Joachim.Fabini@tuwien.ac.at>
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Subject: Re: [ippm] I-D Action: draft-ietf-ippm-active-passive-02.txt
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Hi Al,

I reviewed the changes - the 02 version addresses and resolves all of my
comments.

many thanks,
Joachim

On 19.10.2015 19:19, MORTON, ALFRED C (AL) wrote:
> Hi Tal and Joachim,
> 
> I believe I have addressed your comments in this version.
> 
> Thanks very much for your careful reviews and suggestions!
> 
> regards,
> Al
> 
>> -----Original Message-----
>> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of internet-
>> drafts@ietf.org
>> Sent: Monday, October 19, 2015 1:16 PM
>> To: i-d-announce@ietf.org
>> Cc: ippm@ietf.org
>> Subject: [ippm] I-D Action: draft-ietf-ippm-active-passive-02.txt
>>
>>
>> A New Internet-Draft is available from the on-line Internet-Drafts
>> directories.
>>  This draft is a work item of the IP Performance Metrics Working Group
>> of the IETF.
>>
>>         Title           : Active and Passive Metrics and Methods (and
>> everything in-between, or Hybrid)
>>         Author          : Al Morton
>> 	Filename        : draft-ietf-ippm-active-passive-02.txt
>> 	Pages           : 14
>> 	Date            : 2015-10-19
>>
>> Abstract:
>>    This memo provides clear definitions for Active and Passive
>>    performance assessment.  The construction of Metrics and Methods can
>>    be described as Active or Passive.  Some methods may use a subset of
>>    both active and passive attributes, and we refer to these as Hybrid
>>    Methods.
>>
>>
>> The IETF datatracker status page for this draft is:
>> https://datatracker.ietf.org/doc/draft-ietf-ippm-active-passive/
>>
>> There's also a htmlized version available at:
>> https://tools.ietf.org/html/draft-ietf-ippm-active-passive-02
>>
>> A diff from the previous version is available at:
>> https://www.ietf.org/rfcdiff?url2=draft-ietf-ippm-active-passive-02
>>
>>
>> Please note that it may take a couple of minutes from the time of
>> submission until the htmlized version and diff are available at
>> tools.ietf.org.
>>
>> Internet-Drafts are also available by anonymous FTP at:
>> ftp://ftp.ietf.org/internet-drafts/
>>
>> _______________________________________________
>> 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
> 


From nobody Tue Oct 20 13:25:27 2015
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: Benoit Claise <bclaise@cisco.com>, The IESG <iesg@ietf.org>
Thread-Topic: Benoit Claise's No Objection on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Subject: Re: [ippm] Benoit Claise's No Objection on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Dear Al,
thank you for your thorough review and thoughtful comments. We're working o=
n addressing them and will send proposed updates shortly.

        Regards,
                Greg

-----Original Message-----
From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com]
Sent: Monday, October 19, 2015 2:13 PM
To: draft-ietf-ippm-type-p-monitor.all@tools.ietf.org; ops-dir@ietf.org
Cc: ops-ads@tools.ietf.org; ippm@ietf.org
Subject: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02

OPS-DIR, Authors,

I have reviewed this document as part of the Operational directorate's ongo=
ing effort to review all IETF documents being processed by the IESG.
These comments were written primarily for the benefit of the operational ar=
ea directors. Document editors and WG chairs should treat these comments ju=
st like any other last call comments.

Al

Title:
Differentiated Service Code Point and Explicit Congestion Notification
       Monitoring in Two-Way Active Measurement Protocol (TWAMP)
                   draft-ietf-ippm-type-p-monitor-02
https://tools.ietf.org/html/draft-ietf-ippm-type-p-monitor-02

Summary: Almost ready, comments and editorial suggestions follow.

The draft header should indicate that this draft updates RFC 5357.

Section 2.2.1

Figure 1 has a number of canonical references that should
be cited to ensure IPv4 and IPv6 applicability, including
RFC 2474, RFC 3168, and other relevant updates (of which
there are many).

<later>
   o  if the negotiated/provisioned DSCP value is not known (e.g.  TWAMP
      Light), the choice of the DSCP is implementation specific.  For
      instance, Session-Reflector MAY copy the DSCP value from the
      received test packet and set it as DSCP in a reflected packet.
Question:
What about the ECN value?   From 3168:
      +-----+-----+
      | ECN FIELD |
      +-----+-----+
        ECT   CE         [Obsolete] RFC 2481 names for the ECN bits.
         0     0         Not-ECT
         0     1         ECT(1)
         1     0         ECT(0)
         1     1         CE
It makes little sense to copy a "11" =3D=3D CE into the reflected packet,
and it may affect the measured performance if "11" were copied.
The draft needs more guidance here (there is a general problem
when the negotiated values are "not known"; this does not apply
to the Standards Track TWAMP protocol or its extensions).

-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-

Editorial comments/suggestions:

OLD
2.2.  TWAMP-Test Extension

   Monitoring of DSCP and ECN requires support by the Session-Reflector
   and changes the format of its test packet format both in
   unauthenticated, authenticated and encrypted modes.
Suggest:
   Monitoring of DSCP and ECN requires support by the Session-Reflector
   and changes the test packet format in all the original
   (unauthenticated, authenticated and encrypted) modes.

2.2.1

OLD
   o  the first six bits of the Differentiated Service field MUST be
      copied from received Session-Sender test packet into Sender DSCP
      (S-DSCP) field;

   o  the following two bits of the ECN field MUST be copied from
      received Session-Sender test packet into Sender ECN (S-ECN) field.
Suggest:
   o  the six (least-significant) bits of the Differentiated Service field =
MUST be
      copied from received Session-Sender test packet into Sender DSCP
      (S-DSCP) field;

   o  the two bits of the ECN field MUST be copied from
      received Session-Sender test packet into Sender ECN (S-ECN) field.

because RFC 3168 defines:
         0     1     2     3     4     5     6     7
      +-----+-----+-----+-----+-----+-----+-----+-----+
      |          DS FIELD, DSCP           | ECN FIELD |
      +-----+-----+-----+-----+-----+-----+-----+-----+

        DSCP: differentiated services codepoint
        ECN:  Explicit Congestion Notification

      Figure 2: The Differentiated Services and ECN Fields in IP.
-=3D-=3D-=3D-=3D-=3D-=3D-=3D-

OLD
    0     1     2     3     4     5     6     7     8
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |               S-DSCP              |   S-ECN   |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                Figure 1: Sender DSCP and ECN field format

Suggest:
The extra "+" within bit positions are distracting,
and don't conform to the conventions of these diagrams.
Also, there's no "8" when numbering from 0.

Some attempt should be made to put Figure 3 on a single page in the
final version. There's one line taken up by "+" that is unnecessary
in the modified field:

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    | Sender TTL  |  S-DSCP-ECN   |                               |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +
    |                                                             |
 >> +                                                             + <<
    |                       MBZ (14 octets)                       |
    |                                                             |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+





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<font face=3D"Calibri" size=3D"2"><span style=3D"font-size:11pt;">
<div>Dear Al,</div>
<div>thank you for your thorough review and thoughtful comments. We're work=
ing on addressing them and will send proposed updates shortly.</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regards,</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; Greg</div>
<div>&nbsp;</div>
<div>-----Original Message-----<br>

From: MORTON, ALFRED C (AL) [<a href=3D"mailto:acmorton@att.com">mailto:acm=
orton@att.com</a>]
<br>

Sent: Monday, October 19, 2015 2:13 PM<br>

To: draft-ietf-ippm-type-p-monitor.all@tools.ietf.org; ops-dir@ietf.org<br>

Cc: ops-ads@tools.ietf.org; ippm@ietf.org<br>

Subject: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02</div>
<div>&nbsp;</div>
<div>OPS-DIR, Authors, </div>
<div>&nbsp;</div>
<div>I have reviewed this document as part of the Operational directorate's=
 ongoing effort to review all IETF documents being processed by the IESG.&n=
bsp; </div>
<div>These comments were written primarily for the benefit of the operation=
al area directors. Document editors and WG chairs should treat these commen=
ts just like any other last call comments.</div>
<div>&nbsp;</div>
<div>Al</div>
<div>&nbsp;</div>
<div>Title:</div>
<div>Differentiated Service Code Point and Explicit Congestion Notification=
</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Monitoring in Two-Way Active Meas=
urement Protocol (TWAMP)</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; draft-ietf-ippm-type-p-monitor-02</d=
iv>
<div><a href=3D"https://tools.ietf.org/html/draft-ietf-ippm-type-p-monitor-=
02">https://tools.ietf.org/html/draft-ietf-ippm-type-p-monitor-02</a></div>
<div>&nbsp;</div>
<div>Summary: Almost ready, comments and editorial suggestions follow.</div=
>
<div>&nbsp;</div>
<div>The draft header should indicate that this draft updates RFC 5357.</di=
v>
<div>&nbsp;</div>
<div>Section 2.2.1</div>
<div>&nbsp;</div>
<div>Figure 1 has a number of canonical references that should </div>
<div>be cited to ensure IPv4 and IPv6 applicability, including </div>
<div>RFC 2474, RFC 3168, and other relevant updates (of which </div>
<div>there are many).</div>
<div>&nbsp;</div>
<div>&lt;later&gt;</div>
<div>&nbsp;&nbsp; o&nbsp; if the negotiated/provisioned DSCP value is not k=
nown (e.g.&nbsp; TWAMP</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Light), the choice of the DSCP is imple=
mentation specific.&nbsp; For</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; instance, Session-Reflector MAY copy th=
e DSCP value from the</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received test packet and set it as DSCP=
 in a reflected packet.</div>
<div>Question:</div>
<div>What about the ECN value?&nbsp;&nbsp; From 3168:</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;-----&#43;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | ECN FIELD |</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;-----&#43;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECT&nbsp;&nbsp; CE&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [Obsolete] RFC 2481 names for the E=
CN bits.</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&n=
bsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Not-ECT</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&n=
bsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECT(1)</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&n=
bsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECT(0)</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&n=
bsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CE</div>
<div>It makes little sense to copy a &quot;11&quot; =3D=3D CE into the refl=
ected packet,</div>
<div>and it may affect the measured performance if &quot;11&quot; were copi=
ed.</div>
<div>The draft needs more guidance here (there is a general problem</div>
<div>when the negotiated values are &quot;not known&quot;; this does not ap=
ply </div>
<div>to the Standards Track TWAMP protocol or its extensions).</div>
<div>&nbsp;</div>
<div>-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-</div>
<div>&nbsp;</div>
<div>Editorial comments/suggestions:</div>
<div>&nbsp;</div>
<div>OLD</div>
<div>2.2.&nbsp; TWAMP-Test Extension</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp; Monitoring of DSCP and ECN requires support by the Sessio=
n-Reflector</div>
<div>&nbsp;&nbsp; and changes the format of its test packet format both in<=
/div>
<div>&nbsp;&nbsp; unauthenticated, authenticated and encrypted modes. </div=
>
<div>Suggest:</div>
<div>&nbsp;&nbsp; Monitoring of DSCP and ECN requires support by the Sessio=
n-Reflector</div>
<div>&nbsp;&nbsp; and changes the test packet format in all the original</d=
iv>
<div>&nbsp;&nbsp; (unauthenticated, authenticated and encrypted) modes. </d=
iv>
<div>&nbsp;</div>
<div>2.2.1</div>
<div>&nbsp;</div>
<div>OLD</div>
<div>&nbsp;&nbsp; o&nbsp; the first six bits of the Differentiated Service =
field MUST be</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; copied from received Session-Sender tes=
t packet into Sender DSCP</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (S-DSCP) field;</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp; o&nbsp; the following two bits of the ECN field MUST be c=
opied from</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received Session-Sender test packet int=
o Sender ECN (S-ECN) field.</div>
<div>Suggest:</div>
<div>&nbsp;&nbsp; o&nbsp; the six (least-significant) bits of the Different=
iated Service field MUST be</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; copied from received Session-Sender tes=
t packet into Sender DSCP</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (S-DSCP) field;</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp; o&nbsp; the two bits of the ECN field MUST be copied from=
</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received Session-Sender test packet int=
o Sender ECN (S-ECN) field.</div>
<div>&nbsp;</div>
<div>because RFC 3168 defines:</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&n=
bsp; 1&nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp; 3&nbsp;&nbsp;&nbsp=
;&nbsp; 4&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&nbsp;&nbsp;&nbsp; 6&nbsp;&nbsp;&n=
bsp;&nbsp; 7</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;-----&#43;-----&#43;----=
-&#43;-----&#43;-----&#43;-----&#43;-----&#43;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; DS FIELD, DSCP&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; | ECN FIELD |</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;-----&#43;-----&#43;----=
-&#43;-----&#43;-----&#43;-----&#43;-----&#43;</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DSCP: differentiated servic=
es codepoint</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECN:&nbsp; Explicit Congest=
ion Notification</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 2: The Differentiated Services a=
nd ECN Fields in IP.</div>
<div>-=3D-=3D-=3D-=3D-=3D-=3D-=3D-</div>
<div>&nbsp;</div>
<div>OLD</div>
<div>&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;=
 2&nbsp;&nbsp;&nbsp;&nbsp; 3&nbsp;&nbsp;&nbsp;&nbsp; 4&nbsp;&nbsp;&nbsp;&nb=
sp; 5&nbsp;&nbsp;&nbsp;&nbsp; 6&nbsp;&nbsp;&nbsp;&nbsp; 7&nbsp;&nbsp;&nbsp;=
&nbsp; 8</div>
<div>&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;</div>
<div>&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S-DSCP&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp; S-ECN&nbsp;&nbsp=
; |</div>
<div>&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; Figure 1: Sender DSCP and ECN field format</div>
<div>&nbsp;</div>
<div>Suggest:</div>
<div>The extra &quot;&#43;&quot; within bit positions are distracting,</div=
>
<div>and don't conform to the conventions of these diagrams.</div>
<div>Also, there's no &quot;8&quot; when numbering from 0.</div>
<div>&nbsp;</div>
<div>Some attempt should be made to put Figure 3 on a single page in the </=
div>
<div>final version. There's one line taken up by &quot;&#43;&quot; that is =
unnecessary</div>
<div>in the modified field:</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;</div>
<div>&nbsp;&nbsp;&nbsp; | Sender TTL&nbsp; |&nbsp; S-DSCP-ECN&nbsp;&nbsp; |=
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References: <4508987A-47BE-497A-A2C3-1D94731955FB@trammell.ch> <561CD888.2060708@tuwien.ac.at>
Date: Tue, 20 Oct 2015 15:12:29 -0700
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From: Greg Mirsky <gregimirsky@gmail.com>
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Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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Hi Joachim, et. al,
I believe that characterization of a measurement method as active, passive
or hybrid must be based on its impact on the otherwise normal network
behavior. If the method alters the network behavior or treatment of the
data, then it is active measurement method. If the method does not change
network behavior in any aspect, then it is passive. Why I believe that is
important? Because from this point, marking method that does not affect
treatment of the flow by the network is passive, not active measurement
method since marked and unmarked packets are indistinguishable to the
network except for observer(s). But it the marking method applied in the
manner that would change how marked packets being processed comparing to
unmarked, then it is active method.

Regards,
Greg

On Tue, Oct 13, 2015 at 3:10 AM, Joachim Fabini <Joachim.Fabini@tuwien.ac.at
> wrote:

> Hi Brian, Al, IPPM,
>
> I've read it and it's good... ;) The active-passive-hybrid definition
> and categorization helps enormously and should have been started years
> ago - many thanks to Al for taking the initiative. I consider this work
> to be relevant also for the scientific community. In particular the term
> hybrid is used with many diverging meanings (commonly as a buzzword when
> applying for new project funding), so I spent some time on reviewing and
> reasoning about. Disclaimer: I've not been involved into earlier
> discussions on this draft and it's the first time I read it. Consider it
> to be an unbiased first-time-reader opinion.
>
> Comments (sequential reading, _no_ priority ordering):
>
> Sec. 3.4 (1) s/"a packet stream..."/"Additional packet streams..."/ to
> be more generic? Any stream can be an aggregate of other streams, but
> the second variant seems to be more accurate and flexible (thinking of
> several streams with distinct sources and destinations for impairing
> distinct sub-paths of the measurement path).
>
> Sec. 3.4 (2) "The packets in the stream(s) of interest have fields (or
> are augmented or modified to include fields) which are dedicated to
> measurements"
> Proposed (relaxing) addition: Instead of dedicated measurement fields an
> aggregated set of packet header _values_ can be sufficient to identify
> packets as being part of the active measurement stream.
> Considering the hypothetical case of UDP BTC measurements, the traffic
> is actively generated, so the method is active. But packets are not
> marked, nor are there any specific fields like sequence numbers that can
> be used to identify packets. And for a UDP BTC metric there is no need
> for such. One could argue that packets of a UDP measurement stream can
> be identified by SRC/DST IP addresses and port numbers, which is why
> these fields are dedicated to measurement - but that's not intuitive.
> Alternatively the two occurrences of "fields" could be replaced by
> "fields or field values". The key is that these specific measurement
> stream packets are selected/evaluated/measured in at least one
> measurement location. Possibly nitpicking?
>
> Sec. 3.4 (3) possible typo (known a' priori)
>
> Sec. 3.4: not sure: does it make sense to mention in a note  possible
> changes of packet type (Type-P) along the measurement path (e.g.
> IPv4->IPv6, tunneling, addition of headers) and possible resulting
> measurement issues? We address this issue in the IPv6 draft but my
> feeling is that it can help to raise reader's awareness in this draft,
> too. Type-P at the source does not necessarily mean same Type-P at the
> destination (same observation is valid for passively observing
> intermediate nodes)
>
> Sec. 3.6: What about Passive Measurements and generating background
> load? Consider the case of passive monitoring of a cellular link that
> does on-demand capacity allocation. The measurement process observes the
> measurement stream at ingress and egress. One might be tempted to
> generated some background load that triggers allocation of additional
> capacity on the link. Where does this method fit into: passive or
> hybrid? I'm not sure. As a matter of consistency with the section on
> active methods (where you mention background load traffic explicitly) it
> might be appropriate to discuss this special case for passive methods, too.
>
> Sec. 3.7: Last paragraph (sentence) is very long and difficult to
> understand, including possible typos. Should "basis of reference events
> as packet pass reference point" read "basis of reference events that are
> generated as packet_s_ pass reference points"? Rephrasing can help here.
>
> Sec. 3.8: The differentiation between hybride-active-passive is not
> clear to me from the definition in 3.8. I believe that the definition of
> "hybrid" {sh|c}ould be sharpened to delimit "hybrid" more accurately
> from active and passive.
>
> One particular case of hybrid measurement - imho the most compelling one
> - is the one where passive measurements are combined with additions of
> fields or changes of field values in intermediate
> (observation/measurement) nodes. This includes all kinds of packet
> markings, addition of header fields or changes in header field values in
> intermediate nodes. However, to make the measurement hybrid, these
> changes must be a _consequence_ or _result_ of actions undertaken by the
> (otherwise passive) _measurement_ process.
> My personal opinion on this:
> a) Active: whenever the measurement process generates a dedicated stream
> of measurement packets, where packets are identifiable either by
> dedicated measurement fields (either in payload or header), and/or by
> (possibly aggregated, i.e., set of) field values, the method/metric can
> be categorized as active
> b) Passive: whenever the measurement process observes an existing stream
> of packets without changing/adding/removing any packet fields or field
> values. The passive monitoring _must_not_ add/change/remove header
> fields or header field values. Although passive monitoring might bias
> the timing of the observed traffic to some extent (be it by setting
> interfaces into promiscous mode or by inserting splitters into the path)
> it does not do this _intentionally_. Open question: into which category
> does the generation of background load for passive measurements fit?
> c) Hybrid: the measurement acts exclusively on existing traffic, that
> is, anything that is categorized as passive (b). However, the
> _measurement_ process adds/changes/removes fields or changes packet
> field values in (intermediate) nodes as part of the measurement (may be
> header or payload). Obviously, IPv4 header updates that result from
> forwarding rules (checksum, TTL) are NOT part of the measurement
> process. Question: does "passive + background load" fit into hybrid?
>
> Sec. 3.8: Possible Typo: Y.1540 define_s_ -> _d_?
>
> Sec. 4: 1. Possible typo "effects" -> "biases"?
>
> Sec. 4: "To keep simple, we consider the stream effect only when it is
> present".
> This statement imho conflicts with the main findings of RFC7312. Today's
> networks store flow/stream state at layers below IP, so networks have a
> "historic view". I doubt that this bias can be ignored - infact the bias
> of past periods is visible during the current measurement period. A
> mention of possible consequences in stateful networks with reference to
> 7312 could be a cheap solution (not sure if this is sufficient).
>
> Sec. 4: ASCII diagram: it might improve readability to add axis labels
> (don't know how this can be done easily, maybe split/break descriptions
> of reference points onto several lines): y axis label: "Measurement
> stream capacity", x axis label: "Stream characteristics known".
> In this context its's also not clear to me whether stream
> characteristics must be just "known" or if they must be
> controled/generated/changed.
>
> Sec. 4, 4.1, 4.2: Page 7: The examples (and detailed reasoning) are
> excellent here to support and illustrate the categories defined before.
> Still, I believe that an earlier clear categorization
> active/passive/hybrid in sec. 3.8 can ease the reading.
>
> Sec. 4.1., 4.2: I fully agree with the categorization. However, is the
> "small effect" essential for these examples/statement? One could find
> several cases when the bias onto measurements is substantial - anything
> between a) "packets become too large when adding the PDM header and
> results in <IPv6-fragementation-required> to the sending host", b) "Size
> increase with PDM header makes stream to exceed a network threshold and
> trigger channel capacity re-allocation" and c) "subsequent nodes on the
> path drop these packets because of the measurement node modifications".
> All of these actions should result in substantial bias of measurement
> results. And even the change of field values could result in
> intermediate nodes to apply distinct forwarding policies to the packets.
>
> The point is that the measurement process _intends_ to introduce a
> minimum bias but it's quite difficult to estimate the consequences onto
> measurement results. If this _intention_ is key, then I'm fine with the
> wording. Otherwise one could think about a possible rephrase.
>
> Summarizing: I consider this draft and its definitions to be essential
> for the work and discussions of IPPM and related working groups. It
> tackles the definitions it is supposed to and treats them in adequate
> depth. As a first-time reader I had the impression that some few
> sentences and clarifications can substantially improve the
> categorization and delimiting of active/passive/hybrid methods in sec.
> 3.4-3.8 - I consider this to be the key part of the draft.
>
> regards
> Joachim
>
>
>
> On 07.10.2015 12:47, Brian Trammell wrote:
> > Greetings, all,
> >
> > WG last call on draft-ietf-ippm-active-passive-01 begins today, and will
> end Wednesday 21 October 2015. Please send any comments (including "I've
> read it and it's good" :) ) to the ippm@ietf.org list.
> >
> > Thanks, cheers,
> >
> > Brian (chair hat)
> >
> >
> >
> > _______________________________________________
> > 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
>

--001a11400e1ac54fcc0522908e90
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Joachim, et. al,<div>I believe that characterization of=
 a measurement method as active, passive or hybrid must be based on its imp=
act on the otherwise normal network behavior. If the method alters the netw=
ork behavior or treatment of the data, then it is active measurement method=
. If the method does not change network behavior in any aspect, then it is =
passive. Why I believe that is important? Because from this point, marking =
method that does not affect treatment of the flow by the network is passive=
, not active measurement method since marked and unmarked packets are indis=
tinguishable to the network except for observer(s). But it the marking meth=
od applied in the manner that would change how marked packets being process=
ed comparing to unmarked, then it is active method.</div><div><br></div><di=
v>Regards,</div><div>Greg</div></div><div class=3D"gmail_extra"><br><div cl=
ass=3D"gmail_quote">On Tue, Oct 13, 2015 at 3:10 AM, Joachim Fabini <span d=
ir=3D"ltr">&lt;<a href=3D"mailto:Joachim.Fabini@tuwien.ac.at" target=3D"_bl=
ank">Joachim.Fabini@tuwien.ac.at</a>&gt;</span> wrote:<br><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">Hi Brian, Al, IPPM,<br>
<br>
I&#39;ve read it and it&#39;s good... ;) The active-passive-hybrid definiti=
on<br>
and categorization helps enormously and should have been started years<br>
ago - many thanks to Al for taking the initiative. I consider this work<br>
to be relevant also for the scientific community. In particular the term<br=
>
hybrid is used with many diverging meanings (commonly as a buzzword when<br=
>
applying for new project funding), so I spent some time on reviewing and<br=
>
reasoning about. Disclaimer: I&#39;ve not been involved into earlier<br>
discussions on this draft and it&#39;s the first time I read it. Consider i=
t<br>
to be an unbiased first-time-reader opinion.<br>
<br>
Comments (sequential reading, _no_ priority ordering):<br>
<br>
Sec. 3.4 (1) s/&quot;a packet stream...&quot;/&quot;Additional packet strea=
ms...&quot;/ to<br>
be more generic? Any stream can be an aggregate of other streams, but<br>
the second variant seems to be more accurate and flexible (thinking of<br>
several streams with distinct sources and destinations for impairing<br>
distinct sub-paths of the measurement path).<br>
<br>
Sec. 3.4 (2) &quot;The packets in the stream(s) of interest have fields (or=
<br>
are augmented or modified to include fields) which are dedicated to<br>
measurements&quot;<br>
Proposed (relaxing) addition: Instead of dedicated measurement fields an<br=
>
aggregated set of packet header _values_ can be sufficient to identify<br>
packets as being part of the active measurement stream.<br>
Considering the hypothetical case of UDP BTC measurements, the traffic<br>
is actively generated, so the method is active. But packets are not<br>
marked, nor are there any specific fields like sequence numbers that can<br=
>
be used to identify packets. And for a UDP BTC metric there is no need<br>
for such. One could argue that packets of a UDP measurement stream can<br>
be identified by SRC/DST IP addresses and port numbers, which is why<br>
these fields are dedicated to measurement - but that&#39;s not intuitive.<b=
r>
Alternatively the two occurrences of &quot;fields&quot; could be replaced b=
y<br>
&quot;fields or field values&quot;. The key is that these specific measurem=
ent<br>
stream packets are selected/evaluated/measured in at least one<br>
measurement location. Possibly nitpicking?<br>
<br>
Sec. 3.4 (3) possible typo (known a&#39; priori)<br>
<br>
Sec. 3.4: not sure: does it make sense to mention in a note=C2=A0 possible<=
br>
changes of packet type (Type-P) along the measurement path (e.g.<br>
IPv4-&gt;IPv6, tunneling, addition of headers) and possible resulting<br>
measurement issues? We address this issue in the IPv6 draft but my<br>
feeling is that it can help to raise reader&#39;s awareness in this draft,<=
br>
too. Type-P at the source does not necessarily mean same Type-P at the<br>
destination (same observation is valid for passively observing<br>
intermediate nodes)<br>
<br>
Sec. 3.6: What about Passive Measurements and generating background<br>
load? Consider the case of passive monitoring of a cellular link that<br>
does on-demand capacity allocation. The measurement process observes the<br=
>
measurement stream at ingress and egress. One might be tempted to<br>
generated some background load that triggers allocation of additional<br>
capacity on the link. Where does this method fit into: passive or<br>
hybrid? I&#39;m not sure. As a matter of consistency with the section on<br=
>
active methods (where you mention background load traffic explicitly) it<br=
>
might be appropriate to discuss this special case for passive methods, too.=
<br>
<br>
Sec. 3.7: Last paragraph (sentence) is very long and difficult to<br>
understand, including possible typos. Should &quot;basis of reference event=
s<br>
as packet pass reference point&quot; read &quot;basis of reference events t=
hat are<br>
generated as packet_s_ pass reference points&quot;? Rephrasing can help her=
e.<br>
<br>
Sec. 3.8: The differentiation between hybride-active-passive is not<br>
clear to me from the definition in 3.8. I believe that the definition of<br=
>
&quot;hybrid&quot; {sh|c}ould be sharpened to delimit &quot;hybrid&quot; mo=
re accurately<br>
from active and passive.<br>
<br>
One particular case of hybrid measurement - imho the most compelling one<br=
>
- is the one where passive measurements are combined with additions of<br>
fields or changes of field values in intermediate<br>
(observation/measurement) nodes. This includes all kinds of packet<br>
markings, addition of header fields or changes in header field values in<br=
>
intermediate nodes. However, to make the measurement hybrid, these<br>
changes must be a _consequence_ or _result_ of actions undertaken by the<br=
>
(otherwise passive) _measurement_ process.<br>
My personal opinion on this:<br>
a) Active: whenever the measurement process generates a dedicated stream<br=
>
of measurement packets, where packets are identifiable either by<br>
dedicated measurement fields (either in payload or header), and/or by<br>
(possibly aggregated, i.e., set of) field values, the method/metric can<br>
be categorized as active<br>
b) Passive: whenever the measurement process observes an existing stream<br=
>
of packets without changing/adding/removing any packet fields or field<br>
values. The passive monitoring _must_not_ add/change/remove header<br>
fields or header field values. Although passive monitoring might bias<br>
the timing of the observed traffic to some extent (be it by setting<br>
interfaces into promiscous mode or by inserting splitters into the path)<br=
>
it does not do this _intentionally_. Open question: into which category<br>
does the generation of background load for passive measurements fit?<br>
c) Hybrid: the measurement acts exclusively on existing traffic, that<br>
is, anything that is categorized as passive (b). However, the<br>
_measurement_ process adds/changes/removes fields or changes packet<br>
field values in (intermediate) nodes as part of the measurement (may be<br>
header or payload). Obviously, IPv4 header updates that result from<br>
forwarding rules (checksum, TTL) are NOT part of the measurement<br>
process. Question: does &quot;passive + background load&quot; fit into hybr=
id?<br>
<br>
Sec. 3.8: Possible Typo: Y.1540 define_s_ -&gt; _d_?<br>
<br>
Sec. 4: 1. Possible typo &quot;effects&quot; -&gt; &quot;biases&quot;?<br>
<br>
Sec. 4: &quot;To keep simple, we consider the stream effect only when it is=
<br>
present&quot;.<br>
This statement imho conflicts with the main findings of RFC7312. Today&#39;=
s<br>
networks store flow/stream state at layers below IP, so networks have a<br>
&quot;historic view&quot;. I doubt that this bias can be ignored - infact t=
he bias<br>
of past periods is visible during the current measurement period. A<br>
mention of possible consequences in stateful networks with reference to<br>
7312 could be a cheap solution (not sure if this is sufficient).<br>
<br>
Sec. 4: ASCII diagram: it might improve readability to add axis labels<br>
(don&#39;t know how this can be done easily, maybe split/break descriptions=
<br>
of reference points onto several lines): y axis label: &quot;Measurement<br=
>
stream capacity&quot;, x axis label: &quot;Stream characteristics known&quo=
t;.<br>
In this context its&#39;s also not clear to me whether stream<br>
characteristics must be just &quot;known&quot; or if they must be<br>
controled/generated/changed.<br>
<br>
Sec. 4, 4.1, 4.2: Page 7: The examples (and detailed reasoning) are<br>
excellent here to support and illustrate the categories defined before.<br>
Still, I believe that an earlier clear categorization<br>
active/passive/hybrid in sec. 3.8 can ease the reading.<br>
<br>
Sec. 4.1., 4.2: I fully agree with the categorization. However, is the<br>
&quot;small effect&quot; essential for these examples/statement? One could =
find<br>
several cases when the bias onto measurements is substantial - anything<br>
between a) &quot;packets become too large when adding the PDM header and<br=
>
results in &lt;IPv6-fragementation-required&gt; to the sending host&quot;, =
b) &quot;Size<br>
increase with PDM header makes stream to exceed a network threshold and<br>
trigger channel capacity re-allocation&quot; and c) &quot;subsequent nodes =
on the<br>
path drop these packets because of the measurement node modifications&quot;=
.<br>
All of these actions should result in substantial bias of measurement<br>
results. And even the change of field values could result in<br>
intermediate nodes to apply distinct forwarding policies to the packets.<br=
>
<br>
The point is that the measurement process _intends_ to introduce a<br>
minimum bias but it&#39;s quite difficult to estimate the consequences onto=
<br>
measurement results. If this _intention_ is key, then I&#39;m fine with the=
<br>
wording. Otherwise one could think about a possible rephrase.<br>
<br>
Summarizing: I consider this draft and its definitions to be essential<br>
for the work and discussions of IPPM and related working groups. It<br>
tackles the definitions it is supposed to and treats them in adequate<br>
depth. As a first-time reader I had the impression that some few<br>
sentences and clarifications can substantially improve the<br>
categorization and delimiting of active/passive/hybrid methods in sec.<br>
3.4-3.8 - I consider this to be the key part of the draft.<br>
<br>
regards<br>
Joachim<br>
<br>
<br>
<br>
On 07.10.2015 12:47, Brian Trammell wrote:<br>
&gt; Greetings, all,<br>
&gt;<br>
&gt; WG last call on draft-ietf-ippm-active-passive-01 begins today, and wi=
ll end Wednesday 21 October 2015. Please send any comments (including &quot=
;I&#39;ve read it and it&#39;s good&quot; :) ) to the <a href=3D"mailto:ipp=
m@ietf.org">ippm@ietf.org</a> list.<br>
&gt;<br>
&gt; Thanks, cheers,<br>
&gt;<br>
&gt; Brian (chair hat)<br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt; _______________________________________________<br>
&gt; ippm mailing list<br>
&gt; <a href=3D"mailto:ippm@ietf.org">ippm@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/ippm" rel=3D"noreferr=
er" target=3D"_blank">https://www.ietf.org/mailman/listinfo/ippm</a><br>
&gt;<br>
<br>
_______________________________________________<br>
ippm mailing list<br>
<a href=3D"mailto:ippm@ietf.org">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><br></div>

--001a11400e1ac54fcc0522908e90--


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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Just a few mostly editorial comments:

- Abstract: Did you mean OPTIONAL to be capitalized in the abstract? I'm
not sure what the purpose of a 2119 keyword would be there.

- 1, first paragraph:
There are lots of missing articles ("the") in the first paragraph.

-1, 2nd paragraph:
There's no need to say it's OPTIONAL more than once.

- 2.1, 1st paragraph:
"DSCP and ECN monitoring flag" and "Mode" each need a leading "the".

- 2.2.1:
The MUST in the first paragraph is not really needed. The
Session-Reflector either supports the extension and does these things, or
does not support the extension and does not do these things.

- First bullet in list at end of 2.2.1:
s/extracts/extract



From nobody Tue Oct 20 15:29:00 2015
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Just a few mostly editorial comments:

- Abstract: Did you mean OPTIONAL to be capitalized in the abstract? I'm
not sure what the purpose of a 2119 keyword would be there.

- 1, first paragraph:
There are lots of missing articles ("the") in the first paragraph.

-1, 2nd paragraph:
There's no need to say it's OPTIONAL more than once.

- 2.1, 1st paragraph:
"DSCP and ECN monitoring flag" and "Mode" each need a leading "the".

- 2.2.1:
The MUST in the first paragraph is not really needed. The
Session-Reflector either supports the extension and does these things, or
does not support the extension and does not do these things.

- First bullet in list at end of 2.2.1:
s/extracts/extract



From nobody Tue Oct 20 16:43:17 2015
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "Ackermann, Michael" <MAckermann@bcbsm.com>, Greg Mirsky <gregimirsky@gmail.com>, Joachim Fabini <Joachim.Fabini@tuwien.ac.at>
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Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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From nobody Tue Oct 20 19:35:41 2015
Return-Path: <acmorton@att.com>
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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: Greg Mirsky <gregimirsky@gmail.com>, Joachim Fabini <Joachim.Fabini@tuwien.ac.at>
Date: Tue, 20 Oct 2015 22:35:32 -0400
Thread-Topic: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, Greg Mirsky <gregimirsky@gmail.com>, Joachim Fabini <Joachim.Fabini@tuwien.ac.at>
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From nobody Wed Oct 21 00:20:17 2015
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Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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Hi Greg, all,

it's an interesting aspect that you raise. There are several
perspectives to approach this issue - but I see all of them ending up in
categorizing value changes as hybrid. Below my reasoning:

One key observation is that networks do no longer behave like stateless
copper wires as we used to abstract them. Many networks and components
store internal state and per-session or per-flow information.
There is no way and no rule to predict the consequences of changing a
single bit in packet payload or packet headers along an unknown path.

Whenever an intermediate node _adds_a_new_ field (e.g., PDM) to an
observed packet, this changes the way the network treats the packet
according to our traditional copper wire abstraction (packetDelay =
defaultDelay + packetSize/linkCapacity). So there is no doubt that this
is a hybrid case, right?

But there is no way to infer the consequence of marking packets (i.e.,
changing values of header fields beyond the basics required for IPv4
routing, meaning TTL and Checksum for IPv4) in the general case.
My position is that this draft _must_ tackle the _most_general_ worst
case. That is, value changes (potentially) modify the way an unknown
path treats these packets.
I agree that in particular scenarios (white-box measurements) the path
and behavior of all of its links and systems might be known. In such a
case I see, indeed, an overlapping of hybrid and passive - in the sense
that the method is hybrid _and_ might be categorized as passive, too,
when the white-box analysis indicates that marking (in terms of value
changes) has no impact on the way the network treats the packets.

Still, my absolute preference is to address the most general case. Which
means, that any packet modification by _measurement_ processes_ in
intermediate nodes - this includes both, a) addition/deletion of fields
or b) modification of _values_, labels this measurement method to belong
to the hybrid category.

Another argument: Assume that there are several, overlapping
measurements of packets ongoing along the same path. Some of them (a)
strictly passive, observing, some of them (b) hybrid. The passive
measurement (a) relies on specific packet checksums or hashes to
identify a packet in subsequent intermediate nodes and has no knowledge
of (b). Now assume that the hybrid measurement process (b) marks some
packets (changes values, adds fields). This will potentially screw up
(a)'s ability to identify packets.

But let's put this into the context of the theoretical IPPM framework:
changing packet header values in intermediate nodes modifies the Type-P
of the packet. Your measurement process might use a superset of Type-P
(that ignores the marking) to categorize packets, other components might
use subsets (that do _not_ ignore the marking). In the general case and
for black-box paths, a measurement process can not predict the
consequences of markings in intermediate nodes onto the Type-P treatment
of all potential links and components along the path.

Just recently I found a surprisingly future-proof paragraph in RFC 2330
(RFC 2330, page 30, second paragraph):

"A closely related note: it would be very useful to know if a given
Internet component treats equally a class C of different types of
packets. If so, then any one of those types of packets can be used
for subsequent measurement of the component. This suggests we devise
a metric or suite of metrics that attempt to determine C."

Referencing this definition, one possible compromise could be the
following observation (with explicit reference to the paragraph above):
"hybrid measurements that mark packets of a class C in intermediate
nodes may be categorized as passive, too, when all parties accessing
these packets along the path (in between and including sender and
receiver) categorize both types of packets, before the marking and
afterwards, into the same class C".

Summarizing, my position is that whenever a measurement process changes
packet header values in intermediate nodes this categorizes the process
as hybrid.

Joachim


On 21.10.2015 06:28, Gregory Mirsky wrote:
> Hi Al,
> 
> thank you for sharing you view. Perhaps I used â€œnormal behaviorâ€
> somewhat too often and without clearly linking it to treatment,
> processing on a packet to which the measurement method in question
> directly applied. As Mike and I discussed PDM, weâ€™ve looked at the cases
> when the Optional header is already part of the packet and when the
> header must be added in order to support the PDM. In the first case I
> donâ€™t see that PDM alters processing on the packet by the network while
> in the second thereâ€™s clear impact as the packet size must be increased.
> 
> Hope this example explains the context in which Iâ€™ve used â€œnormal
> network behaviorâ€.
> 
>  
> 
>                 Regards,
> 
>                                 Greg
> 
>  
> 
> *From:*ippm [mailto:ippm-bounces@ietf.org] *On Behalf Of *MORTON, ALFRED
> C (AL)
> *Sent:* Tuesday, October 20, 2015 7:36 PM
> *To:* Greg Mirsky; Joachim Fabini
> *Cc:* ippm@ietf.org
> *Subject:* Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
> 
>  
> 
> Hi Greg,
> 
>  
> 
> I donâ€™t see a clear way to include impact on normal network behavior
> 
> in a definition, because:
> 
>  
> 
> - the network behavior may be unknown.
> 
> - the network behavior may change.
> 
> - the network may react to any/every new packet.
> 
> - the network can react to any packet feature that is in clear view.
> 
>  
> 
> We have discussed that some methods intend to have small impact,
> 
> but we can never be certain that they will achieve this goal.
> 
>  
> 
> Al
> 
>  
> 
> *From:*ippm [mailto:ippm-bounces@ietf.org] *On Behalf Of *Greg Mirsky
> *Sent:* Tuesday, October 20, 2015 6:12 PM
> *To:* Joachim Fabini
> *Cc:* ippm@ietf.org <mailto:ippm@ietf.org>
> *Subject:* Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
> 
>  
> 
> Hi Joachim, et. al,
> 
> I believe that characterization of a measurement method as active,
> passive or hybrid must be based on its impact on the otherwise normal
> network behavior. If the method alters the network behavior or treatment
> of the data, then it is active measurement method. If the method does
> not change network behavior in any aspect, then it is passive. Why I
> believe that is important? Because from this point, marking method that
> does not affect treatment of the flow by the network is passive, not
> active measurement method since marked and unmarked packets are
> indistinguishable to the network except for observer(s). But it the
> marking method applied in the manner that would change how marked
> packets being processed comparing to unmarked, then it is active method.
> 
>  
> 
> Regards,
> 
> Greg
> 
>  
> 
> On Tue, Oct 13, 2015 at 3:10 AM, Joachim Fabini
> <Joachim.Fabini@tuwien.ac.at <mailto:Joachim.Fabini@tuwien.ac.at>> wrote:
> 
> Hi Brian, Al, IPPM,
> 
> I've read it and it's good... ;) The active-passive-hybrid definition
> and categorization helps enormously and should have been started years
> ago - many thanks to Al for taking the initiative. I consider this work
> to be relevant also for the scientific community. In particular the term
> hybrid is used with many diverging meanings (commonly as a buzzword when
> applying for new project funding), so I spent some time on reviewing and
> reasoning about. Disclaimer: I've not been involved into earlier
> discussions on this draft and it's the first time I read it. Consider it
> to be an unbiased first-time-reader opinion.
> 
> Comments (sequential reading, _no_ priority ordering):
> 
> Sec. 3.4 (1) s/"a packet stream..."/"Additional packet streams..."/ to
> be more generic? Any stream can be an aggregate of other streams, but
> the second variant seems to be more accurate and flexible (thinking of
> several streams with distinct sources and destinations for impairing
> distinct sub-paths of the measurement path).
> 
> Sec. 3.4 (2) "The packets in the stream(s) of interest have fields (or
> are augmented or modified to include fields) which are dedicated to
> measurements"
> Proposed (relaxing) addition: Instead of dedicated measurement fields an
> aggregated set of packet header _values_ can be sufficient to identify
> packets as being part of the active measurement stream.
> Considering the hypothetical case of UDP BTC measurements, the traffic
> is actively generated, so the method is active. But packets are not
> marked, nor are there any specific fields like sequence numbers that can
> be used to identify packets. And for a UDP BTC metric there is no need
> for such. One could argue that packets of a UDP measurement stream can
> be identified by SRC/DST IP addresses and port numbers, which is why
> these fields are dedicated to measurement - but that's not intuitive.
> Alternatively the two occurrences of "fields" could be replaced by
> "fields or field values". The key is that these specific measurement
> stream packets are selected/evaluated/measured in at least one
> measurement location. Possibly nitpicking?
> 
> Sec. 3.4 (3) possible typo (known a' priori)
> 
> Sec. 3.4: not sure: does it make sense to mention in a note  possible
> changes of packet type (Type-P) along the measurement path (e.g.
> IPv4->IPv6, tunneling, addition of headers) and possible resulting
> measurement issues? We address this issue in the IPv6 draft but my
> feeling is that it can help to raise reader's awareness in this draft,
> too. Type-P at the source does not necessarily mean same Type-P at the
> destination (same observation is valid for passively observing
> intermediate nodes)
> 
> Sec. 3.6: What about Passive Measurements and generating background
> load? Consider the case of passive monitoring of a cellular link that
> does on-demand capacity allocation. The measurement process observes the
> measurement stream at ingress and egress. One might be tempted to
> generated some background load that triggers allocation of additional
> capacity on the link. Where does this method fit into: passive or
> hybrid? I'm not sure. As a matter of consistency with the section on
> active methods (where you mention background load traffic explicitly) it
> might be appropriate to discuss this special case for passive methods, too.
> 
> Sec. 3.7: Last paragraph (sentence) is very long and difficult to
> understand, including possible typos. Should "basis of reference events
> as packet pass reference point" read "basis of reference events that are
> generated as packet_s_ pass reference points"? Rephrasing can help here.
> 
> Sec. 3.8: The differentiation between hybride-active-passive is not
> clear to me from the definition in 3.8. I believe that the definition of
> "hybrid" {sh|c}ould be sharpened to delimit "hybrid" more accurately
> from active and passive.
> 
> One particular case of hybrid measurement - imho the most compelling one
> - is the one where passive measurements are combined with additions of
> fields or changes of field values in intermediate
> (observation/measurement) nodes. This includes all kinds of packet
> markings, addition of header fields or changes in header field values in
> intermediate nodes. However, to make the measurement hybrid, these
> changes must be a _consequence_ or _result_ of actions undertaken by the
> (otherwise passive) _measurement_ process.
> My personal opinion on this:
> a) Active: whenever the measurement process generates a dedicated stream
> of measurement packets, where packets are identifiable either by
> dedicated measurement fields (either in payload or header), and/or by
> (possibly aggregated, i.e., set of) field values, the method/metric can
> be categorized as active
> b) Passive: whenever the measurement process observes an existing stream
> of packets without changing/adding/removing any packet fields or field
> values. The passive monitoring _must_not_ add/change/remove header
> fields or header field values. Although passive monitoring might bias
> the timing of the observed traffic to some extent (be it by setting
> interfaces into promiscous mode or by inserting splitters into the path)
> it does not do this _intentionally_. Open question: into which category
> does the generation of background load for passive measurements fit?
> c) Hybrid: the measurement acts exclusively on existing traffic, that
> is, anything that is categorized as passive (b). However, the
> _measurement_ process adds/changes/removes fields or changes packet
> field values in (intermediate) nodes as part of the measurement (may be
> header or payload). Obviously, IPv4 header updates that result from
> forwarding rules (checksum, TTL) are NOT part of the measurement
> process. Question: does "passive + background load" fit into hybrid?
> 
> Sec. 3.8: Possible Typo: Y.1540 define_s_ -> _d_?
> 
> Sec. 4: 1. Possible typo "effects" -> "biases"?
> 
> Sec. 4: "To keep simple, we consider the stream effect only when it is
> present".
> This statement imho conflicts with the main findings of RFC7312. Today's
> networks store flow/stream state at layers below IP, so networks have a
> "historic view". I doubt that this bias can be ignored - infact the bias
> of past periods is visible during the current measurement period. A
> mention of possible consequences in stateful networks with reference to
> 7312 could be a cheap solution (not sure if this is sufficient).
> 
> Sec. 4: ASCII diagram: it might improve readability to add axis labels
> (don't know how this can be done easily, maybe split/break descriptions
> of reference points onto several lines): y axis label: "Measurement
> stream capacity", x axis label: "Stream characteristics known".
> In this context its's also not clear to me whether stream
> characteristics must be just "known" or if they must be
> controled/generated/changed.
> 
> Sec. 4, 4.1, 4.2: Page 7: The examples (and detailed reasoning) are
> excellent here to support and illustrate the categories defined before.
> Still, I believe that an earlier clear categorization
> active/passive/hybrid in sec. 3.8 can ease the reading.
> 
> Sec. 4.1., 4.2: I fully agree with the categorization. However, is the
> "small effect" essential for these examples/statement? One could find
> several cases when the bias onto measurements is substantial - anything
> between a) "packets become too large when adding the PDM header and
> results in <IPv6-fragementation-required> to the sending host", b) "Size
> increase with PDM header makes stream to exceed a network threshold and
> trigger channel capacity re-allocation" and c) "subsequent nodes on the
> path drop these packets because of the measurement node modifications".
> All of these actions should result in substantial bias of measurement
> results. And even the change of field values could result in
> intermediate nodes to apply distinct forwarding policies to the packets.
> 
> The point is that the measurement process _intends_ to introduce a
> minimum bias but it's quite difficult to estimate the consequences onto
> measurement results. If this _intention_ is key, then I'm fine with the
> wording. Otherwise one could think about a possible rephrase.
> 
> Summarizing: I consider this draft and its definitions to be essential
> for the work and discussions of IPPM and related working groups. It
> tackles the definitions it is supposed to and treats them in adequate
> depth. As a first-time reader I had the impression that some few
> sentences and clarifications can substantially improve the
> categorization and delimiting of active/passive/hybrid methods in sec.
> 3.4-3.8 - I consider this to be the key part of the draft.
> 
> regards
> Joachim
> 
> 
> 
> On 07.10.2015 12:47, Brian Trammell wrote:
>> Greetings, all,
>>
>> WG last call on draft-ietf-ippm-active-passive-01 begins today, and
> will end Wednesday 21 October 2015. Please send any comments (including
> "I've read it and it's good" :) ) to the ippm@ietf.org
> <mailto:ippm@ietf.org> list.
>>
>> Thanks, cheers,
>>
>> Brian (chair hat)
>>
>>
>>
>> _______________________________________________
>> ippm mailing list
>> ippm@ietf.org <mailto:ippm@ietf.org>
>> https://www.ietf.org/mailman/listinfo/ippm
>>
> 
> _______________________________________________
> ippm mailing list
> ippm@ietf.org <mailto:ippm@ietf.org>
> https://www.ietf.org/mailman/listinfo/ippm
> 
>  
> 


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From: "Ackermann, Michael" <MAckermann@bcbsm.com>
To: Joachim Fabini <Joachim.Fabini@tuwien.ac.at>, Gregory Mirsky <gregory.mirsky@ericsson.com>, "MORTON, ALFRED C (AL)" <acmorton@att.com>, Greg Mirsky <gregimirsky@gmail.com>
Thread-Topic: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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From nobody Wed Oct 21 08:27:36 2015
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Subject: [ippm] Kathleen Moriarty's No Objection on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Kathleen Moriarty has entered the following ballot position for
draft-ietf-ippm-type-p-monitor-02: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Since rfc5357 has more discussion on the differences between
unauthenticated, authenticated, and encrypted modes, it would be helpful
to have a pointer to that specific point in the Security Considerations
section.



From nobody Wed Oct 21 10:37:27 2015
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: Ben Campbell <ben@nostrum.com>, The IESG <iesg@ietf.org>
Thread-Topic: Ben Campbell's No Objection on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Subject: Re: [ippm] Ben Campbell's No Objection on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: Kathleen Moriarty <Kathleen.Moriarty.ietf@gmail.com>, The IESG <iesg@ietf.org>
Thread-Topic: Kathleen Moriarty's No Objection on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Date: Thu, 22 Oct 2015 00:25:56 +0000
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Subject: Re: [ippm] Kathleen Moriarty's No Objection on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: Gregory Mirsky <gregory.mirsky@ericsson.com>, "draft-ietf-ippm-type-p-monitor.all@tools.ietf.org" <draft-ietf-ippm-type-p-monitor.all@tools.ietf.org>, "ops-dir@ietf.org" <ops-dir@ietf.org>
Date: Wed, 21 Oct 2015 21:35:24 -0400
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Hi Greg,

I don=1B$B!G=1B(Bt think you addressed this comment:



The draft header should indicate that this draft updates RFC 5357.


If you need help with the XML formatting to do this,
let me know.

In the draft, the section that moved needs a bit more
editing, IMO:

                   The DSCP value is often copied into reflected test packe=
ts with
                  current TWAMP implementations (with or without TWAMP-Cont=
rol
I would claim this is only
true for the =1B$B!H=1B(Bwithout control=1B$B!I=1B(B case,
so s/with or without/without/
( I must have read this as =1B$B!H=1B(Bwithout=1B$B!I=1B(B
previously, I have knowledge of many
deployed TWAMP nodes.)

                  protocol).  With DSCP and ECN Monitoring Extension, the S=
ession-
                  Reflector handles DSCP as following:

                   o  the Session-Reflector MUST extract the S-DSCP-ECN val=
ue from the
                     DSCP and ECN values of received packets;

                   o  the Session-Reflector MUST transmit each reflected te=
st packet
                     with DSCP set to the negotiated/provisioned value;

                   o  if the negotiated/provisioned DSCP value is not known=
 (e.g.  TWAMP
                     Light), the choice of the DSCP is implementation speci=
fic.  For
                     instance, Session-Reflector MAY copy the DSCP value fr=
om the
                    received test packet and set it as DSCP in a reflected =
packet.

                   o  ECN SHOULD be set to Not-ECT codepoint value [RFC3168=
].

I think this (new) last bullet needs to read:
o  if the negotiated/provisioned ECN value is not known,
   ECN SHOULD be set to Not-ECT codepoint value [RFC3168].
   Otherwise, the provisioned ECN value for the session SHALL be used.

hope this helps,
Al



From: Gregory Mirsky [mailto:gregory.mirsky@ericsson.com]
Sent: Wednesday, October 21, 2015 6:19 PM
To: MORTON, ALFRED C (AL); draft-ietf-ippm-type-p-monitor.all@tools.ietf.or=
g; ops-dir@ietf.org
Cc: ops-ads@tools.ietf.org; ippm@ietf.org
Subject: RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02


Dear Al,

thank you for your thorough review and thoughtful comments. I've prepared t=
he new version to respond to all comments but from Kathleen Moriarty (need =
some extra time).

Would greatly appreciate your review of the changes and hope that these add=
ress your comments.

Please find my answers below in-line and tagged GIM>>.



                Regards,

                                Greg



-----Original Message-----
From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com]
Sent: Monday, October 19, 2015 2:13 PM
To: draft-ietf-ippm-type-p-monitor.all@tools.ietf.org<mailto:draft-ietf-ipp=
m-type-p-monitor.all@tools.ietf.org>; ops-dir@ietf.org<mailto:ops-dir@ietf.=
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Cc: ops-ads@tools.ietf.org<mailto:ops-ads@tools.ietf.org>; ippm@ietf.org<ma=
ilto:ippm@ietf.org>
Subject: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02



OPS-DIR, Authors,



I have reviewed this document as part of the Operational directorate's ongo=
ing effort to review all IETF documents being processed by the IESG.

These comments were written primarily for the benefit of the operational ar=
ea directors. Document editors and WG chairs should treat these comments ju=
st like any other last call comments.



Al



Title:

Differentiated Service Code Point and Explicit Congestion Notification

       Monitoring in Two-Way Active Measurement Protocol (TWAMP)

                   draft-ietf-ippm-type-p-monitor-02

https://tools.ietf.org/html/draft-ietf-ippm-type-p-monitor-02



Summary: Almost ready, comments and editorial suggestions follow.



The draft header should indicate that this draft updates RFC 5357.



Section 2.2.1



Figure 1 has a number of canonical references that should

be cited to ensure IPv4 and IPv6 applicability, including

RFC 2474, RFC 3168, and other relevant updates (of which

there are many).



<later>

   o  if the negotiated/provisioned DSCP value is not known (e.g.  TWAMP

      Light), the choice of the DSCP is implementation specific.  For

      instance, Session-Reflector MAY copy the DSCP value from the

      received test packet and set it as DSCP in a reflected packet.

Question:

What about the ECN value?   From 3168:

      +-----+-----+

      | ECN FIELD |

      +-----+-----+

        ECT   CE         [Obsolete] RFC 2481 names for the ECN bits.

         0     0         Not-ECT

         0     1         ECT(1)

         1     0         ECT(0)

         1     1         CE

It makes little sense to copy a "11" =3D=3D CE into the reflected packet,

and it may affect the measured performance if "11" were copied.

The draft needs more guidance here (there is a general problem

when the negotiated values are "not known"; this does not apply

to the Standards Track TWAMP protocol or its extensions).

GIM>> Added

ECN SHOULD be set to Not-ECT codepoint value [RFC3168].

-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-



Editorial comments/suggestions:



OLD

2.2.  TWAMP-Test Extension



   Monitoring of DSCP and ECN requires support by the Session-Reflector

   and changes the format of its test packet format both in

   unauthenticated, authenticated and encrypted modes.

Suggest:

   Monitoring of DSCP and ECN requires support by the Session-Reflector

   and changes the test packet format in all the original

   (unauthenticated, authenticated and encrypted) modes.



GIM=1B$B"d=1B(B Thank you, accepted.

2.2.1



OLD

   o  the first six bits of the Differentiated Service field MUST be

      copied from received Session-Sender test packet into Sender DSCP

      (S-DSCP) field;



   o  the following two bits of the ECN field MUST be copied from

      received Session-Sender test packet into Sender ECN (S-ECN) field.

Suggest:

   o  the six (least-significant) bits of the Differentiated Service field =
MUST be

      copied from received Session-Sender test packet into Sender DSCP

      (S-DSCP) field;



   o  the two bits of the ECN field MUST be copied from

      received Session-Sender test packet into Sender ECN (S-ECN) field.

GIM=1B$B"d=1B(B Thank you. Accepted.



because RFC 3168 defines:

         0     1     2     3     4     5     6     7

      +-----+-----+-----+-----+-----+-----+-----+-----+

      |          DS FIELD, DSCP           | ECN FIELD |

      +-----+-----+-----+-----+-----+-----+-----+-----+



        DSCP: differentiated services codepoint

        ECN:  Explicit Congestion Notification



      Figure 2: The Differentiated Services and ECN Fields in IP.

-=3D-=3D-=3D-=3D-=3D-=3D-=3D-



OLD

    0     1     2     3     4     5     6     7     8

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    |               S-DSCP              |   S-ECN   |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



                Figure 1: Sender DSCP and ECN field format



Suggest:

The extra "+" within bit positions are distracting,

and don't conform to the conventions of these diagrams.

Also, there's no "8" when numbering from 0.

GIM=1B$B"d=1B(B Agree. New version:

      0   1   2   3   4   5   6   7
    +---+---+---+---+---+---+---+---+
    |         S-DSCP        | S-ECN |
    +---+---+---+---+---+---+---+---+

                Figure 1: Sender DSCP and ECN field format





Some attempt should be made to put Figure 3 on a single page in the

final version. There's one line taken up by "+" that is unnecessary

in the modified field:

GIM=1B$B"d=1B(B That turned to be rather difficult, considering that the or=
iginal figure in RFC 5357 is over one page already. I've tried to move figu=
re to the very top though.

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    | Sender TTL  |  S-DSCP-ECN   |                               |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +

    |                                                             |

>> +                                                             + <<

    |                       MBZ (14 octets)                       |

    |                                                             |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+







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<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
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<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue vli=
nk=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span style=3D'f=
ont-family:"Courier New";color:black'>Hi Greg,<o:p></o:p></span></p><p clas=
s=3DMsoNormal><span style=3D'font-family:"Courier New";color:black'><o:p>&n=
bsp;</o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Couri=
er New";color:black'>I don=1B$B!G=1B(Bt think you addressed this comment:<o=
:p></o:p></span></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=
=3DMsoPlainText>The draft header should indicate that this draft updates RF=
C 5357.<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=
=3DMsoNormal><span style=3D'font-family:"Courier New";color:black'>If you n=
eed help with the XML formatting to do this,<o:p></o:p></span></p><p class=
=3DMsoNormal><span style=3D'font-family:"Courier New";color:black'>let me k=
now.<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"=
Courier New";color:black'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal>=
<span style=3D'font-family:"Courier New";color:black'>In the draft, the sec=
tion that moved needs a bit more <o:p></o:p></span></p><p class=3DMsoNormal=
><span style=3D'font-family:"Courier New";color:black'>editing, IMO:<o:p></=
o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New=
";color:black'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span style=
=3D'font-family:"Courier New";color:black'>&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;The DSCP value is often copied into reflected test packets with&nbsp;&nbs=
p;&nbsp;&nbsp; <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'fo=
nt-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;  &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;current TWAMP =
implementations (with or without TWAMP-Control <o:p></o:p></span></p><p cla=
ss=3DMsoNormal><span style=3D'font-family:"Courier New";color:black'>I woul=
d claim this is only <o:p></o:p></span></p><p class=3DMsoNormal><span style=
=3D'font-family:"Courier New";color:black'>true for the =1B$B!H=1B(Bwithout=
 control=1B$B!I=1B(B case, <o:p></o:p></span></p><p class=3DMsoNormal><span=
 style=3D'font-family:"Courier New";color:black'>so s/with or without/witho=
ut/<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"C=
ourier New";color:black'>( I must have read this as =1B$B!H=1B(Bwithout=1B$=
B!I=1B(B <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-fam=
ily:"Courier New";color:black'>previously, I have knowledge of many <o:p></=
o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New=
";color:black'>deployed TWAMP nodes.)<o:p></o:p></span></p><p class=3DMsoNo=
rmal><span style=3D'font-family:"Courier New";color:black'><o:p>&nbsp;</o:p=
></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New";c=
olor:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  &=
nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;protocol).&nbsp; With DSCP and ECN Moni=
toring Extension, the Session-&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></span></=
p><p class=3DMsoNormal><span style=3D'font-family:"Courier New";color:black=
'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  &nbsp;&nbsp=
;&nbsp; &nbsp;&nbsp;&nbsp;Reflector handles DSCP as following:&nbsp;&nbsp;&=
nbsp; <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-family=
:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <o:p>=
</o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier N=
ew";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p; &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; the Session-Reflector=
 MUST extract the S-DSCP-ECN value from the&nbsp; <o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-family:"Courier New";color:black'>&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  &nbsp;&nbsp;&nbs=
p; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;DSCP and ECN values of received pack=
ets;&nbsp; <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-f=
amily:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Cour=
ier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; the Session-Refl=
ector MUST transmit each reflected test packet&nbsp;&nbsp;&nbsp;&nbsp; <o:p=
></o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier =
New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;  &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;with DSCP set t=
o the negotiated/provisioned value;&nbsp;&nbsp; <o:p></o:p></span></p><p cl=
ass=3DMsoNormal><span style=3D'font-family:"Courier New";color:black'>&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  &nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p><p class=3DMsoNo=
rmal><span style=3D'font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &nbsp=
;&nbsp;&nbsp;o&nbsp; if the negotiated/provisioned DSCP value is not known =
(e.g.&nbsp; TWAMP <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D=
'font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;  &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;Light), the choice of the DSCP is implementation specific.&nbsp; For=
&nbsp; <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-famil=
y:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;  &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;inst=
ance, Session-Reflector MAY copy the DSCP value from the&nbsp;&nbsp;&nbsp;&=
nbsp; <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-family=
:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;  &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;received te=
st packet and set it as DSCP in a reflected packet.&nbsp;&nbsp;&nbsp;&nbsp;=
 <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Cou=
rier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p=
></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New";c=
olor:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; ECN SHOULD be set to Not-E=
CT codepoint value [RFC3168].&nbsp;&nbsp; <o:p></o:p></span></p><p class=3D=
MsoNormal><span style=3D'font-family:"Courier New";color:black'><o:p>&nbsp;=
</o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier N=
ew";color:black'>I think this (new) last bullet needs to read:<o:p></o:p></=
span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New";colo=
r:black'>o&nbsp; if the negotiated/provisioned ECN value is not known,<o:p>=
</o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier N=
ew";color:black'>&nbsp;&nbsp; ECN SHOULD be set to Not-ECT codepoint value =
[RFC3168].<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-fa=
mily:"Courier New";color:black'>&nbsp;&nbsp; Otherwise, the provisioned ECN=
 value for the session SHALL be used.<o:p></o:p></span></p><p class=3DMsoNo=
rmal><span style=3D'font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Courier New";color:black'>hope this helps,<o:p></o:p>=
</span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New";co=
lor:black'>Al<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font=
-family:"Courier New";color:black'><o:p>&nbsp;</o:p></span></p><p class=3DM=
soNormal><span style=3D'font-family:"Courier New";color:black'><o:p>&nbsp;<=
/o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier Ne=
w";color:black'><o:p>&nbsp;</o:p></span></p><div style=3D'border:none;borde=
r-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style=3D'borde=
r:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=
=3DMsoNormal><b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-=
serif"'>From:</span></b><span style=3D'font-size:10.0pt;font-family:"Tahoma=
","sans-serif"'> Gregory Mirsky [mailto:gregory.mirsky@ericsson.com] <br><b=
>Sent:</b> Wednesday, October 21, 2015 6:19 PM<br><b>To:</b> MORTON, ALFRED=
 C (AL); draft-ietf-ippm-type-p-monitor.all@tools.ietf.org; ops-dir@ietf.or=
g<br><b>Cc:</b> ops-ads@tools.ietf.org; ippm@ietf.org<br><b>Subject:</b> RE=
: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02<o:p></o:p></span></p></=
div></div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText=
>Dear Al,<o:p></o:p></p><p class=3DMsoPlainText>thank you for your thorough=
 review and thoughtful comments. I've prepared the new version to respond t=
o all comments but from Kathleen Moriarty (need some extra time).<o:p></o:p=
></p><p class=3DMsoPlainText>Would greatly appreciate your review of the ch=
anges and hope that these address your comments.<o:p></o:p></p><p class=3DM=
soPlainText>Please find my answers below in-line and tagged GIM&gt;&gt;.<o:=
p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlai=
nText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp; Regards,<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Greg<o:p></o:p></p><p class=3DMsoPlainText><=
o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>-----Original Message-----<br>F=
rom: MORTON, ALFRED C (AL) [<a href=3D"mailto:acmorton@att.com">mailto:acmo=
rton@att.com</a>] <br>Sent: Monday, October 19, 2015 2:13 PM<br>To: <a href=
=3D"mailto:draft-ietf-ippm-type-p-monitor.all@tools.ietf.org">draft-ietf-ip=
pm-type-p-monitor.all@tools.ietf.org</a>; <a href=3D"mailto:ops-dir@ietf.or=
g">ops-dir@ietf.org</a><br>Cc: <a href=3D"mailto:ops-ads@tools.ietf.org">op=
s-ads@tools.ietf.org</a>; <a href=3D"mailto:ippm@ietf.org">ippm@ietf.org</a=
><br>Subject: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02<o:p></o:p><=
/p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>OPS=
-DIR, Authors, <o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p>=
<p class=3DMsoPlainText>I have reviewed this document as part of the Operat=
ional directorate's ongoing effort to review all IETF documents being proce=
ssed by the IESG.&nbsp; <o:p></o:p></p><p class=3DMsoPlainText>These commen=
ts were written primarily for the benefit of the operational area directors=
. Document editors and WG chairs should treat these comments just like any =
other last call comments.<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;=
</o:p></p><p class=3DMsoPlainText>Al<o:p></o:p></p><p class=3DMsoPlainText>=
<o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>Title:<o:p></o:p></p><p class=
=3DMsoPlainText>Differentiated Service Code Point and Explicit Congestion N=
otification<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp; Monitoring in Two-Way Active Measurement Protocol (TWAMP)<o:p><=
/o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; draft-ie=
tf-ippm-type-p-monitor-02<o:p></o:p></p><p class=3DMsoPlainText><a href=3D"=
https://tools.ietf.org/html/draft-ietf-ippm-type-p-monitor-02"><span style=
=3D'color:windowtext;text-decoration:none'>https://tools.ietf.org/html/draf=
t-ietf-ippm-type-p-monitor-02</span></a><o:p></o:p></p><p class=3DMsoPlainT=
ext><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>Summary: Almost ready, com=
ments and editorial suggestions follow.<o:p></o:p></p><p class=3DMsoPlainTe=
xt><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>The draft header should ind=
icate that this draft updates RFC 5357.<o:p></o:p></p><p class=3DMsoPlainTe=
xt><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>Section 2.2.1<o:p></o:p></p=
><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>Figur=
e 1 has a number of canonical references that should <o:p></o:p></p><p clas=
s=3DMsoPlainText>be cited to ensure IPv4 and IPv6 applicability, including =
<o:p></o:p></p><p class=3DMsoPlainText>RFC 2474, RFC 3168, and other releva=
nt updates (of which <o:p></o:p></p><p class=3DMsoPlainText>there are many)=
.<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMso=
PlainText>&lt;later&gt;<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp; =
o&nbsp; if the negotiated/provisioned DSCP value is not known (e.g.&nbsp; T=
WAMP<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; L=
ight), the choice of the DSCP is implementation specific.&nbsp; For<o:p></o=
:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; instance, Ses=
sion-Reflector MAY copy the DSCP value from the<o:p></o:p></p><p class=3DMs=
oPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received test packet and set it a=
s DSCP in a reflected packet.<o:p></o:p></p><p class=3DMsoPlainText>Questio=
n:<o:p></o:p></p><p class=3DMsoPlainText>What about the ECN value?&nbsp;&nb=
sp; From 3168:<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp; +-----+-----+<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; | ECN FIELD |<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; +-----+-----+<o:p></o:p></p><p class=3DMsoPlainTex=
t>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECT&nbsp;&nbsp; CE&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [Obsolete] RFC 2481 names for the ECN =
bits.<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; Not-ECT<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECT(1)<o:p></o:p></p><p class=3DMso=
PlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nb=
sp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECT(0)<o:p></o:=
p></p><p class=3DMsoPlainText>&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;1&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; CE<o:p></o:p></p><p class=3DMsoPlainText>It makes little sense to copy=
 a &quot;11&quot; =3D=3D CE into the reflected packet,<o:p></o:p></p><p cla=
ss=3DMsoPlainText>and it may affect the measured performance if &quot;11&qu=
ot; were copied.<o:p></o:p></p><p class=3DMsoPlainText>The draft needs more=
 guidance here (there is a general problem<o:p></o:p></p><p class=3DMsoPlai=
nText>when the negotiated values are &quot;not known&quot;; this does not a=
pply <o:p></o:p></p><p class=3DMsoPlainText>to the Standards Track TWAMP pr=
otocol or its extensions).<o:p></o:p></p><p class=3DMsoPlainText>GIM&gt;&gt=
; Added<o:p></o:p></p><p class=3DMsoPlainText style=3D'margin-left:.5in'><s=
pan style=3D'color:black'>ECN SHOULD be set to Not-ECT codepoint value [RFC=
3168].<o:p></o:p></span></p><p class=3DMsoPlainText>-=3D-=3D-=3D-=3D-=3D-=
=3D-=3D-=3D-=3D-=3D-=3D-=3D-<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nb=
sp;</o:p></p><p class=3DMsoPlainText>Editorial comments/suggestions:<o:p></=
o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainTex=
t>OLD<o:p></o:p></p><p class=3DMsoPlainText>2.2.&nbsp; TWAMP-Test Extension=
<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoP=
lainText>&nbsp;&nbsp; Monitoring of DSCP and ECN requires support by the Se=
ssion-Reflector<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp; and chan=
ges the format of its test packet format both in<o:p></o:p></p><p class=3DM=
soPlainText>&nbsp;&nbsp; unauthenticated, authenticated and encrypted modes=
. <o:p></o:p></p><p class=3DMsoPlainText>Suggest:<o:p></o:p></p><p class=3D=
MsoPlainText>&nbsp;&nbsp; Monitoring of DSCP and ECN requires support by th=
e Session-Reflector<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp; and =
changes the test packet format in all the original<o:p></o:p></p><p class=
=3DMsoPlainText>&nbsp;&nbsp; (unauthenticated, authenticated and encrypted)=
 modes. <o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p clas=
s=3DMsoPlainText><span style=3D'color:black'>GIM</span><span style=3D'font-=
family:"Cambria Math","serif";color:black'>=1B$B"d=1B(B</span><span style=
=3D'color:black'> Thank you, accepted.<o:p></o:p></span></p><p class=3DMsoP=
lainText>2.2.1<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><=
p class=3DMsoPlainText>OLD<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbs=
p; o&nbsp; the first six bits of the Differentiated Service field MUST be<o=
:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; copied =
from received Session-Sender test packet into Sender DSCP<o:p></o:p></p><p =
class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (S-DSCP) field;<o:p></o=
:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText=
>&nbsp;&nbsp; o&nbsp; the following two bits of the ECN field MUST be copie=
d from<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 received Session-Sender test packet into Sender ECN (S-ECN) field.<o:p></o=
:p></p><p class=3DMsoPlainText>Suggest:<o:p></o:p></p><p class=3DMsoPlainTe=
xt>&nbsp;&nbsp; o&nbsp; the six (least-significant) bits of the Differentia=
ted Service field MUST be<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp; copied from received Session-Sender test packet into Se=
nder DSCP<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; (S-DSCP) field;<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p>=
</p><p class=3DMsoPlainText>&nbsp;&nbsp; o&nbsp; the two bits of the ECN fi=
eld MUST be copied from<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp; received Session-Sender test packet into Sender ECN (S-EC=
N) field.<o:p></o:p></p><p class=3DMsoPlainText><span style=3D'color:black'=
>GIM</span><span style=3D'font-family:"Cambria Math","serif";color:black'>=
=1B$B"d=1B(B</span><span style=3D'color:black'> Thank you. Accepted.<o:p></=
o:p></span></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoP=
lainText>because RFC 3168 defines:<o:p></o:p></p><p class=3DMsoPlainText>&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;0&nbsp;&nbsp;&nbsp;&nbsp; 1&=
nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp; 3&nbsp;&nbsp;&nbsp;&nbsp;=
 4&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&nbsp;&nbsp;&nbsp; 6&nbsp;&nbsp;&nbsp;&nb=
sp; 7<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
+-----+-----+-----+-----+-----+-----+-----+-----+<o:p></o:p></p><p class=3D=
MsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; DS FIELD, DSCP&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; | ECN FIELD |<o:p></o:p></p><p class=3DMsoPlainTex=
t>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; +-----+-----+-----+-----+-----+-----+-----=
+-----+<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=
=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DSCP: differenti=
ated services codepoint<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECN:&nbsp; Explicit Congestion Notification<o=
:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPla=
inText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 2: The Differentiated Services=
 and ECN Fields in IP.<o:p></o:p></p><p class=3DMsoPlainText>-=3D-=3D-=3D-=
=3D-=3D-=3D-=3D-<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p=
><p class=3DMsoPlainText>OLD<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&n=
bsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp=
;&nbsp;&nbsp; 3&nbsp;&nbsp;&nbsp;&nbsp; 4&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&n=
bsp;&nbsp;&nbsp; 6&nbsp;&nbsp;&nbsp;&nbsp; 7&nbsp;&nbsp;&nbsp;&nbsp; 8<o:p>=
</o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; +-+-+-+-+-+-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nb=
sp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; S-DSCP&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp; S-ECN&nbsp;&nbsp; |<o:p></o:p>=
</p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; +-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:=
p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 1: Sender DSCP and ECN=
 field format<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p=
 class=3DMsoPlainText>Suggest:<o:p></o:p></p><p class=3DMsoPlainText>The ex=
tra &quot;+&quot; within bit positions are distracting,<o:p></o:p></p><p cl=
ass=3DMsoPlainText>and don't conform to the conventions of these diagrams.<=
o:p></o:p></p><p class=3DMsoPlainText>Also, there's no &quot;8&quot; when n=
umbering from 0.<o:p></o:p></p><p class=3DMsoPlainText><span style=3D'color=
:black'>GIM</span><span style=3D'font-family:"Cambria Math","serif";color:b=
lack'>=1B$B"d=1B(B</span><span style=3D'color:black'> Agree. New version:<o=
:p></o:p></span></p><p class=3DMsoPlainText><span style=3D'font-family:"Cou=
rier New"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; 1&nbsp;&nbsp; 2&nbs=
p;&nbsp; 3&nbsp;&nbsp; 4&nbsp;&nbsp; 5&nbsp;&nbsp; 6&nbsp;&nbsp; 7<br>&nbsp=
;&nbsp;&nbsp; +---+---+---+---+---+---+---+---+<br>&nbsp;&nbsp;&nbsp; |&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S-DSCP&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | S-ECN |<br>&nbsp;&nbsp;&nbsp; +---+---+---+---+---+---=
+---+---+<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 1: Sender DSCP and ECN field format=
</span><o:p></o:p></p><p class=3DMsoPlainText><span style=3D'color:black'><=
o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText>Some attempt should be made to put Figure 3 on a singl=
e page in the <o:p></o:p></p><p class=3DMsoPlainText>final version. There's=
 one line taken up by &quot;+&quot; that is unnecessary<o:p></o:p></p><p cl=
ass=3DMsoPlainText>in the modified field:<o:p></o:p></p><p class=3DMsoPlain=
Text>GIM<span style=3D'font-family:"Cambria Math","serif"'>=1B$B"d=1B(B</sp=
an> That turned to be rather difficult, considering that the original figur=
e in RFC 5357 is over one page already. I've tried to move figure to the ve=
ry top though.<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; +-+=
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+<o:p></o:p></p>=
<p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; | Sender TTL&nbsp; |&nbsp; S-DSC=
P-ECN&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |<o:p></o:p></p><p class=
=3DMsoPlainText>&nbsp;&nbsp;&nbsp; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp; +<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&=
nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p><=
/o:p></p><p class=3DMsoPlainText>&gt;&gt; +&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; + &lt;&lt;<o:p></o:p></p><p class=3DMsoPlainTe=
xt>&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; MBZ (14 octets)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; |<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |<o:p></o:p></p><p class=
=3DMsoPlainText>&nbsp;&nbsp;&nbsp; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</=
o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainTex=
t><o:p>&nbsp;</o:p></p></div></div></body></html>=

--_000_4AF73AA205019A4C8A1DDD32C034631D0BB67F99D2NJFPSRVEXG0re_--


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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, "draft-ietf-ippm-type-p-monitor.all@tools.ietf.org" <draft-ietf-ippm-type-p-monitor.all@tools.ietf.org>, "ops-dir@ietf.org" <ops-dir@ietf.org>
Thread-Topic: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02
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Subject: Re: [ippm] OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02
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Hi Al,
yes, forgot about that comment. I do need help with the XML and greatly app=
reciate your help.

I=1B$B!G=1B(Bll work on addressing other suggestions.

                Regards,
                                Greg

From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com]
Sent: Wednesday, October 21, 2015 6:35 PM
To: Gregory Mirsky; draft-ietf-ippm-type-p-monitor.all@tools.ietf.org; ops-=
dir@ietf.org
Cc: ops-ads@tools.ietf.org; ippm@ietf.org
Subject: RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02

Hi Greg,

I don=1B$B!G=1B(Bt think you addressed this comment:



The draft header should indicate that this draft updates RFC 5357.


If you need help with the XML formatting to do this,
let me know.

In the draft, the section that moved needs a bit more
editing, IMO:

                   The DSCP value is often copied into reflected test packe=
ts with
                  current TWAMP implementations (with or without TWAMP-Cont=
rol
I would claim this is only
true for the =1B$B!H=1B(Bwithout control=1B$B!I=1B(B case,
so s/with or without/without/
( I must have read this as =1B$B!H=1B(Bwithout=1B$B!I=1B(B
previously, I have knowledge of many
deployed TWAMP nodes.)

                  protocol).  With DSCP and ECN Monitoring Extension, the S=
ession-
                  Reflector handles DSCP as following:

                   o  the Session-Reflector MUST extract the S-DSCP-ECN val=
ue from the
                     DSCP and ECN values of received packets;

                   o  the Session-Reflector MUST transmit each reflected te=
st packet
                     with DSCP set to the negotiated/provisioned value;

                   o  if the negotiated/provisioned DSCP value is not known=
 (e.g.  TWAMP
                     Light), the choice of the DSCP is implementation speci=
fic.  For
                     instance, Session-Reflector MAY copy the DSCP value fr=
om the
                    received test packet and set it as DSCP in a reflected =
packet.

                   o  ECN SHOULD be set to Not-ECT codepoint value [RFC3168=
].

I think this (new) last bullet needs to read:
o  if the negotiated/provisioned ECN value is not known,
   ECN SHOULD be set to Not-ECT codepoint value [RFC3168].
   Otherwise, the provisioned ECN value for the session SHALL be used.

hope this helps,
Al



From: Gregory Mirsky [mailto:gregory.mirsky@ericsson.com]
Sent: Wednesday, October 21, 2015 6:19 PM
To: MORTON, ALFRED C (AL); draft-ietf-ippm-type-p-monitor.all@tools.ietf.or=
g<mailto:draft-ietf-ippm-type-p-monitor.all@tools.ietf.org>; ops-dir@ietf.o=
rg<mailto:ops-dir@ietf.org>
Cc: ops-ads@tools.ietf.org<mailto:ops-ads@tools.ietf.org>; ippm@ietf.org<ma=
ilto:ippm@ietf.org>
Subject: RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02


Dear Al,

thank you for your thorough review and thoughtful comments. I've prepared t=
he new version to respond to all comments but from Kathleen Moriarty (need =
some extra time).

Would greatly appreciate your review of the changes and hope that these add=
ress your comments.

Please find my answers below in-line and tagged GIM>>.



                Regards,

                                Greg



-----Original Message-----
From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com]
Sent: Monday, October 19, 2015 2:13 PM
To: draft-ietf-ippm-type-p-monitor.all@tools.ietf.org<mailto:draft-ietf-ipp=
m-type-p-monitor.all@tools.ietf.org>; ops-dir@ietf.org<mailto:ops-dir@ietf.=
org>
Cc: ops-ads@tools.ietf.org<mailto:ops-ads@tools.ietf.org>; ippm@ietf.org<ma=
ilto:ippm@ietf.org>
Subject: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02



OPS-DIR, Authors,



I have reviewed this document as part of the Operational directorate's ongo=
ing effort to review all IETF documents being processed by the IESG.

These comments were written primarily for the benefit of the operational ar=
ea directors. Document editors and WG chairs should treat these comments ju=
st like any other last call comments.



Al



Title:

Differentiated Service Code Point and Explicit Congestion Notification

       Monitoring in Two-Way Active Measurement Protocol (TWAMP)

                   draft-ietf-ippm-type-p-monitor-02

https://tools.ietf.org/html/draft-ietf-ippm-type-p-monitor-02



Summary: Almost ready, comments and editorial suggestions follow.



The draft header should indicate that this draft updates RFC 5357.



Section 2.2.1



Figure 1 has a number of canonical references that should

be cited to ensure IPv4 and IPv6 applicability, including

RFC 2474, RFC 3168, and other relevant updates (of which

there are many).



<later>

   o  if the negotiated/provisioned DSCP value is not known (e.g.  TWAMP

      Light), the choice of the DSCP is implementation specific.  For

      instance, Session-Reflector MAY copy the DSCP value from the

      received test packet and set it as DSCP in a reflected packet.

Question:

What about the ECN value?   From 3168:

      +-----+-----+

      | ECN FIELD |

      +-----+-----+

        ECT   CE         [Obsolete] RFC 2481 names for the ECN bits.

         0     0         Not-ECT

         0     1         ECT(1)

         1     0         ECT(0)

         1     1         CE

It makes little sense to copy a "11" =3D=3D CE into the reflected packet,

and it may affect the measured performance if "11" were copied.

The draft needs more guidance here (there is a general problem

when the negotiated values are "not known"; this does not apply

to the Standards Track TWAMP protocol or its extensions).

GIM>> Added

ECN SHOULD be set to Not-ECT codepoint value [RFC3168].

-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-



Editorial comments/suggestions:



OLD

2.2.  TWAMP-Test Extension



   Monitoring of DSCP and ECN requires support by the Session-Reflector

   and changes the format of its test packet format both in

   unauthenticated, authenticated and encrypted modes.

Suggest:

   Monitoring of DSCP and ECN requires support by the Session-Reflector

   and changes the test packet format in all the original

   (unauthenticated, authenticated and encrypted) modes.



GIM=1B$B"d=1B(B Thank you, accepted.

2.2.1



OLD

   o  the first six bits of the Differentiated Service field MUST be

      copied from received Session-Sender test packet into Sender DSCP

      (S-DSCP) field;



   o  the following two bits of the ECN field MUST be copied from

      received Session-Sender test packet into Sender ECN (S-ECN) field.

Suggest:

   o  the six (least-significant) bits of the Differentiated Service field =
MUST be

      copied from received Session-Sender test packet into Sender DSCP

      (S-DSCP) field;



   o  the two bits of the ECN field MUST be copied from

      received Session-Sender test packet into Sender ECN (S-ECN) field.

GIM=1B$B"d=1B(B Thank you. Accepted.



because RFC 3168 defines:

         0     1     2     3     4     5     6     7

      +-----+-----+-----+-----+-----+-----+-----+-----+

      |          DS FIELD, DSCP           | ECN FIELD |

      +-----+-----+-----+-----+-----+-----+-----+-----+



        DSCP: differentiated services codepoint

        ECN:  Explicit Congestion Notification



      Figure 2: The Differentiated Services and ECN Fields in IP.

-=3D-=3D-=3D-=3D-=3D-=3D-=3D-



OLD

    0     1     2     3     4     5     6     7     8

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    |               S-DSCP              |   S-ECN   |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



                Figure 1: Sender DSCP and ECN field format



Suggest:

The extra "+" within bit positions are distracting,

and don't conform to the conventions of these diagrams.

Also, there's no "8" when numbering from 0.

GIM=1B$B"d=1B(B Agree. New version:

      0   1   2   3   4   5   6   7
    +---+---+---+---+---+---+---+---+
    |         S-DSCP        | S-ECN |
    +---+---+---+---+---+---+---+---+

                Figure 1: Sender DSCP and ECN field format





Some attempt should be made to put Figure 3 on a single page in the

final version. There's one line taken up by "+" that is unnecessary

in the modified field:

GIM=1B$B"d=1B(B That turned to be rather difficult, considering that the or=
iginal figure in RFC 5357 is over one page already. I've tried to move figu=
re to the very top though.

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    | Sender TTL  |  S-DSCP-ECN   |                               |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +

    |                                                             |

>> +                                                             + <<

    |                       MBZ (14 octets)                       |

    |                                                             |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+







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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Al,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">yes, forgot about that=
 comment. I do need help with the XML and greatly appreciate your help.<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I=1B$B!G=1B(Bll work o=
n addressing other suggestions.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regard=
s,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; Greg<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> MORTON, =
ALFRED C (AL) [mailto:acmorton@att.com]
<br>
<b>Sent:</b> Wednesday, October 21, 2015 6:35 PM<br>
<b>To:</b> Gregory Mirsky; draft-ietf-ippm-type-p-monitor.all@tools.ietf.or=
g; ops-dir@ietf.org<br>
<b>Cc:</b> ops-ads@tools.ietf.org; ippm@ietf.org<br>
<b>Subject:</b> RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">Hi Greg,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">I don=1B$B!G=1B(Bt think you addressed this comment:<o:p></o:p>=
</span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">The draft header should indicate that this draft =
updates RFC 5357.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">If you need help with the XML formatting to do this,<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">let me know.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">In the draft, the section that moved needs a bit more
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">editing, IMO:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The DSCP value is often copie=
d into reflected test packets with&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;current TWAMP implementations (with or w=
ithout TWAMP-Control
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">I would claim this is only
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">true for the =1B$B!H=1B(Bwithout control=1B$B!I=1B(B case,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">so s/with or without/without/<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">( I must have read this as =1B$B!H=1B(Bwithout=1B$B!I=1B(B
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">previously, I have knowledge of many
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">deployed TWAMP nodes.)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;protocol).&nbsp; With DSCP and ECN Monit=
oring Extension, the Session-&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;Reflector handles DSCP as following:&nbs=
p;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; the Session-Reflector MUST=
 extract the S-DSCP-ECN value from the&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;DSCP and ECN values of=
 received packets;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; the Session-Reflector MUST=
 transmit each reflected test packet&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;with DSCP set to the n=
egotiated/provisioned value;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; if the negotiated/provisio=
ned DSCP value is not known (e.g.&nbsp; TWAMP
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Light), the choice of =
the DSCP is implementation specific.&nbsp; For&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;instance, Session-Refl=
ector MAY copy the DSCP value from the&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;received test packet and set=
 it as DSCP in a reflected packet.&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; ECN SHOULD be set to Not-E=
CT codepoint value [RFC3168].&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">I think this (new) last bullet needs to read:<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">o&nbsp; if the negotiated/provisioned ECN value is not known,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp; ECN SHOULD be set to Not-ECT codepoint value [RFC3=
168].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp; Otherwise, the provisioned ECN value for the sessi=
on SHALL be used.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">hope this helps,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">Al<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Gregory =
Mirsky [<a href=3D"mailto:gregory.mirsky@ericsson.com">mailto:gregory.mirsk=
y@ericsson.com</a>]
<br>
<b>Sent:</b> Wednesday, October 21, 2015 6:19 PM<br>
<b>To:</b> MORTON, ALFRED C (AL); <a href=3D"mailto:draft-ietf-ippm-type-p-=
monitor.all@tools.ietf.org">
draft-ietf-ippm-type-p-monitor.all@tools.ietf.org</a>; <a href=3D"mailto:op=
s-dir@ietf.org">
ops-dir@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:ops-ads@tools.ietf.org">ops-ads@tools.ietf.org=
</a>; <a href=3D"mailto:ippm@ietf.org">
ippm@ietf.org</a><br>
<b>Subject:</b> RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Dear Al,<o:p></o:p></p>
<p class=3D"MsoPlainText">thank you for your thorough review and thoughtful=
 comments. I've prepared the new version to respond to all comments but fro=
m Kathleen Moriarty (need some extra time).<o:p></o:p></p>
<p class=3D"MsoPlainText">Would greatly appreciate your review of the chang=
es and hope that these address your comments.<o:p></o:p></p>
<p class=3D"MsoPlainText">Please find my answers below in-line and tagged G=
IM&gt;&gt;.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regards,<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Greg<o:p></o=
:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">-----Original Message-----<br>
From: MORTON, ALFRED C (AL) [<a href=3D"mailto:acmorton@att.com">mailto:acm=
orton@att.com</a>]
<br>
Sent: Monday, October 19, 2015 2:13 PM<br>
To: <a href=3D"mailto:draft-ietf-ippm-type-p-monitor.all@tools.ietf.org">dr=
aft-ietf-ippm-type-p-monitor.all@tools.ietf.org</a>;
<a href=3D"mailto:ops-dir@ietf.org">ops-dir@ietf.org</a><br>
Cc: <a href=3D"mailto:ops-ads@tools.ietf.org">ops-ads@tools.ietf.org</a>; <=
a href=3D"mailto:ippm@ietf.org">
ippm@ietf.org</a><br>
Subject: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">OPS-DIR, Authors, <o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">I have reviewed this document as part of the Oper=
ational directorate's ongoing effort to review all IETF documents being pro=
cessed by the IESG.&nbsp;
<o:p></o:p></p>
<p class=3D"MsoPlainText">These comments were written primarily for the ben=
efit of the operational area directors. Document editors and WG chairs shou=
ld treat these comments just like any other last call comments.<o:p></o:p><=
/p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Al<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Title:<o:p></o:p></p>
<p class=3D"MsoPlainText">Differentiated Service Code Point and Explicit Co=
ngestion Notification<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Monitoring i=
n Two-Way Active Measurement Protocol (TWAMP)<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; draft-ietf-ippm=
-type-p-monitor-02<o:p></o:p></p>
<p class=3D"MsoPlainText"><a href=3D"https://tools.ietf.org/html/draft-ietf=
-ippm-type-p-monitor-02"><span style=3D"color:windowtext;text-decoration:no=
ne">https://tools.ietf.org/html/draft-ietf-ippm-type-p-monitor-02</span></a=
><o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Summary: Almost ready, comments and editorial sug=
gestions follow.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">The draft header should indicate that this draft =
updates RFC 5357.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Section 2.2.1<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Figure 1 has a number of canonical references tha=
t should
<o:p></o:p></p>
<p class=3D"MsoPlainText">be cited to ensure IPv4 and IPv6 applicability, i=
ncluding
<o:p></o:p></p>
<p class=3D"MsoPlainText">RFC 2474, RFC 3168, and other relevant updates (o=
f which <o:p>
</o:p></p>
<p class=3D"MsoPlainText">there are many).<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&lt;later&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; if the negotiated/provisione=
d DSCP value is not known (e.g.&nbsp; TWAMP<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Light), the choice=
 of the DSCP is implementation specific.&nbsp; For<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; instance, Session-=
Reflector MAY copy the DSCP value from the<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received test pack=
et and set it as DSCP in a reflected packet.<o:p></o:p></p>
<p class=3D"MsoPlainText">Question:<o:p></o:p></p>
<p class=3D"MsoPlainText">What about the ECN value?&nbsp;&nbsp; From 3168:<=
o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;---=
--&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | ECN FIELD |<o:p>=
</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;---=
--&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECT&nb=
sp;&nbsp; CE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [Obsolete] RFC=
 2481 names for the ECN bits.<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
0&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 Not-ECT<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
0&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 ECT(1)<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
1&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 ECT(0)<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
1&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 CE<o:p></o:p></p>
<p class=3D"MsoPlainText">It makes little sense to copy a &quot;11&quot; =
=3D=3D CE into the reflected packet,<o:p></o:p></p>
<p class=3D"MsoPlainText">and it may affect the measured performance if &qu=
ot;11&quot; were copied.<o:p></o:p></p>
<p class=3D"MsoPlainText">The draft needs more guidance here (there is a ge=
neral problem<o:p></o:p></p>
<p class=3D"MsoPlainText">when the negotiated values are &quot;not known&qu=
ot;; this does not apply
<o:p></o:p></p>
<p class=3D"MsoPlainText">to the Standards Track TWAMP protocol or its exte=
nsions).<o:p></o:p></p>
<p class=3D"MsoPlainText">GIM&gt;&gt; Added<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:.5in"><span style=3D"color:b=
lack">ECN SHOULD be set to Not-ECT codepoint value [RFC3168].<o:p></o:p></s=
pan></p>
<p class=3D"MsoPlainText">-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Editorial comments/suggestions:<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">OLD<o:p></o:p></p>
<p class=3D"MsoPlainText">2.2.&nbsp; TWAMP-Test Extension<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; Monitoring of DSCP and ECN requires =
support by the Session-Reflector<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; and changes the format of its test p=
acket format both in<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; unauthenticated, authenticated and e=
ncrypted modes. <o:p>
</o:p></p>
<p class=3D"MsoPlainText">Suggest:<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; Monitoring of DSCP and ECN requires =
support by the Session-Reflector<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; and changes the test packet format i=
n all the original<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; (unauthenticated, authenticated and =
encrypted) modes. <o:p>
</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">GIM</span><span style=
=3D"font-family:&quot;Cambria Math&quot;,&quot;serif&quot;;color:black">=1B=
$B"d=1B(B</span><span style=3D"color:black"> Thank you, accepted.<o:p></o:p=
></span></p>
<p class=3D"MsoPlainText">2.2.1<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">OLD<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; the first six bits of the Di=
fferentiated Service field MUST be<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; copied from receiv=
ed Session-Sender test packet into Sender DSCP<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (S-DSCP) field;<o:=
p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; the following two bits of th=
e ECN field MUST be copied from<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received Session-S=
ender test packet into Sender ECN (S-ECN) field.<o:p></o:p></p>
<p class=3D"MsoPlainText">Suggest:<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; the six (least-significant) =
bits of the Differentiated Service field MUST be<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; copied from receiv=
ed Session-Sender test packet into Sender DSCP<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (S-DSCP) field;<o:=
p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; the two bits of the ECN fiel=
d MUST be copied from<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received Session-S=
ender test packet into Sender ECN (S-ECN) field.<o:p></o:p></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">GIM</span><span style=
=3D"font-family:&quot;Cambria Math&quot;,&quot;serif&quot;;color:black">=1B=
$B"d=1B(B</span><span style=3D"color:black"> Thank you. Accepted.<o:p></o:p=
></span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">because RFC 3168 defines:<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;=
0&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbs=
p; 3&nbsp;&nbsp;&nbsp;&nbsp; 4&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&nbsp;&nbsp;&=
nbsp; 6&nbsp;&nbsp;&nbsp;&nbsp; 7<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;---=
--&#43;-----&#43;-----&#43;-----&#43;-----&#43;-----&#43;-----&#43;<o:p></o=
:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DS FIELD, DSCP&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | ECN FIELD |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;---=
--&#43;-----&#43;-----&#43;-----&#43;-----&#43;-----&#43;-----&#43;<o:p></o=
:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DSCP: =
differentiated services codepoint<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECN:&n=
bsp; Explicit Congestion Notification<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 2: The Diff=
erentiated Services and ECN Fields in IP.<o:p></o:p></p>
<p class=3D"MsoPlainText">-=3D-=3D-=3D-=3D-=3D-=3D-=3D-<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">OLD<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp; 1&nb=
sp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp; 3&nbsp;&nbsp;&nbsp;&nbsp; 4=
&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&nbsp;&nbsp;&nbsp; 6&nbsp;&nbsp;&nbsp;&nbsp=
; 7&nbsp;&nbsp;&nbsp;&nbsp; 8<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S-DSCP&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&n=
bsp; S-ECN&nbsp;&nbsp; |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 1: Sender DSCP and ECN fie=
ld format<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Suggest:<o:p></o:p></p>
<p class=3D"MsoPlainText">The extra &quot;&#43;&quot; within bit positions =
are distracting,<o:p></o:p></p>
<p class=3D"MsoPlainText">and don't conform to the conventions of these dia=
grams.<o:p></o:p></p>
<p class=3D"MsoPlainText">Also, there's no &quot;8&quot; when numbering fro=
m 0.<o:p></o:p></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">GIM</span><span style=
=3D"font-family:&quot;Cambria Math&quot;,&quot;serif&quot;;color:black">=1B=
$B"d=1B(B</span><span style=3D"color:black"> Agree. New version:<o:p></o:p>=
</span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; 1&nbsp;&nbsp; 2&nbsp;&nbsp;=
 3&nbsp;&nbsp; 4&nbsp;&nbsp; 5&nbsp;&nbsp; 6&nbsp;&nbsp; 7<br>
&nbsp;&nbsp;&nbsp; &#43;---&#43;---&#43;---&#43;---&#43;---&#43;---&#43;---=
&#43;---&#43;<br>
&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S-DSCP=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | S-ECN |<br>
&nbsp;&nbsp;&nbsp; &#43;---&#43;---&#43;---&#43;---&#43;---&#43;---&#43;---=
&#43;---&#43;<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; Figure 1: Sender DSCP and ECN field format</span><o:p></o:p=
></p>
<p class=3D"MsoPlainText"><span style=3D"color:black"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Some attempt should be made to put Figure 3 on a =
single page in the
<o:p></o:p></p>
<p class=3D"MsoPlainText">final version. There's one line taken up by &quot=
;&#43;&quot; that is unnecessary<o:p></o:p></p>
<p class=3D"MsoPlainText">in the modified field:<o:p></o:p></p>
<p class=3D"MsoPlainText">GIM<span style=3D"font-family:&quot;Cambria Math&=
quot;,&quot;serif&quot;">=1B$B"d=1B(B</span> That turned to be rather diffi=
cult, considering that the original figure in RFC 5357 is over one page alr=
eady. I've tried to move figure to the very top though.<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; | Sender TTL&nbsp; |&nbsp; S-D=
SCP-ECN&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; &#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt;&gt; &#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; &#43; &lt;&lt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; MBZ (14 octets)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
</div>
</div>
</body>
</html>

--_000_7347100B5761DC41A166AC17F22DF1122190DBE9eusaamb103erics_--


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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: Gregory Mirsky <gregory.mirsky@ericsson.com>, Kathleen Moriarty <Kathleen.Moriarty.ietf@gmail.com>, The IESG <iesg@ietf.org>
Date: Wed, 21 Oct 2015 21:48:18 -0400
Thread-Topic: Kathleen Moriarty's No Objection on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Subject: Re: [ippm] Kathleen Moriarty's No Objection on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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To: Gregory Mirsky <gregory.mirsky@ericsson.com>, "draft-ietf-ippm-type-p-monitor.all@tools.ietf.org" <draft-ietf-ippm-type-p-monitor.all@tools.ietf.org>, "ops-dir@ietf.org" <ops-dir@ietf.org>
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You can probably find a line similar to this, just before <front>:

<rfc category=3D"info" docName=3D"draft-morton-ippm-2330-stdform-typep-01"
     ipr=3D"trust200902" updates=3D"2330">
  <front>

From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Gregory Mirsky
Sent: Wednesday, October 21, 2015 9:43 PM
To: MORTON, ALFRED C (AL); draft-ietf-ippm-type-p-monitor.all@tools.ietf.or=
g; ops-dir@ietf.org
Cc: ops-ads@tools.ietf.org; ippm@ietf.org
Subject: Re: [ippm] OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02

Hi Al,
yes, forgot about that comment. I do need help with the XML and greatly app=
reciate your help.

I=1B$B!G=1B(Bll work on addressing other suggestions.

                Regards,
                                Greg

From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com]
Sent: Wednesday, October 21, 2015 6:35 PM
To: Gregory Mirsky; draft-ietf-ippm-type-p-monitor.all@tools.ietf.org<mailt=
o:draft-ietf-ippm-type-p-monitor.all@tools.ietf.org>; ops-dir@ietf.org<mail=
to:ops-dir@ietf.org>
Cc: ops-ads@tools.ietf.org<mailto:ops-ads@tools.ietf.org>; ippm@ietf.org<ma=
ilto:ippm@ietf.org>
Subject: RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02

Hi Greg,

I don=1B$B!G=1B(Bt think you addressed this comment:



The draft header should indicate that this draft updates RFC 5357.


If you need help with the XML formatting to do this,
let me know.

In the draft, the section that moved needs a bit more
editing, IMO:

                   The DSCP value is often copied into reflected test packe=
ts with
                  current TWAMP implementations (with or without TWAMP-Cont=
rol
I would claim this is only
true for the =1B$B!H=1B(Bwithout control=1B$B!I=1B(B case,
so s/with or without/without/
( I must have read this as =1B$B!H=1B(Bwithout=1B$B!I=1B(B
previously, I have knowledge of many
deployed TWAMP nodes.)

                  protocol).  With DSCP and ECN Monitoring Extension, the S=
ession-
                  Reflector handles DSCP as following:

                   o  the Session-Reflector MUST extract the S-DSCP-ECN val=
ue from the
                     DSCP and ECN values of received packets;

                   o  the Session-Reflector MUST transmit each reflected te=
st packet
                     with DSCP set to the negotiated/provisioned value;

                   o  if the negotiated/provisioned DSCP value is not known=
 (e.g.  TWAMP
                     Light), the choice of the DSCP is implementation speci=
fic.  For
                     instance, Session-Reflector MAY copy the DSCP value fr=
om the
                    received test packet and set it as DSCP in a reflected =
packet.

                   o  ECN SHOULD be set to Not-ECT codepoint value [RFC3168=
].

I think this (new) last bullet needs to read:
o  if the negotiated/provisioned ECN value is not known,
   ECN SHOULD be set to Not-ECT codepoint value [RFC3168].
   Otherwise, the provisioned ECN value for the session SHALL be used.

hope this helps,
Al



From: Gregory Mirsky [mailto:gregory.mirsky@ericsson.com]
Sent: Wednesday, October 21, 2015 6:19 PM
To: MORTON, ALFRED C (AL); draft-ietf-ippm-type-p-monitor.all@tools.ietf.or=
g<mailto:draft-ietf-ippm-type-p-monitor.all@tools.ietf.org>; ops-dir@ietf.o=
rg<mailto:ops-dir@ietf.org>
Cc: ops-ads@tools.ietf.org<mailto:ops-ads@tools.ietf.org>; ippm@ietf.org<ma=
ilto:ippm@ietf.org>
Subject: RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02


Dear Al,

thank you for your thorough review and thoughtful comments. I've prepared t=
he new version to respond to all comments but from Kathleen Moriarty (need =
some extra time).

Would greatly appreciate your review of the changes and hope that these add=
ress your comments.

Please find my answers below in-line and tagged GIM>>.



                Regards,

                                Greg



-----Original Message-----
From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com]
Sent: Monday, October 19, 2015 2:13 PM
To: draft-ietf-ippm-type-p-monitor.all@tools.ietf.org<mailto:draft-ietf-ipp=
m-type-p-monitor.all@tools.ietf.org>; ops-dir@ietf.org<mailto:ops-dir@ietf.=
org>
Cc: ops-ads@tools.ietf.org<mailto:ops-ads@tools.ietf.org>; ippm@ietf.org<ma=
ilto:ippm@ietf.org>
Subject: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02



OPS-DIR, Authors,



I have reviewed this document as part of the Operational directorate's ongo=
ing effort to review all IETF documents being processed by the IESG.

These comments were written primarily for the benefit of the operational ar=
ea directors. Document editors and WG chairs should treat these comments ju=
st like any other last call comments.



Al



Title:

Differentiated Service Code Point and Explicit Congestion Notification

       Monitoring in Two-Way Active Measurement Protocol (TWAMP)

                   draft-ietf-ippm-type-p-monitor-02

https://tools.ietf.org/html/draft-ietf-ippm-type-p-monitor-02



Summary: Almost ready, comments and editorial suggestions follow.



The draft header should indicate that this draft updates RFC 5357.



Section 2.2.1



Figure 1 has a number of canonical references that should

be cited to ensure IPv4 and IPv6 applicability, including

RFC 2474, RFC 3168, and other relevant updates (of which

there are many).



<later>

   o  if the negotiated/provisioned DSCP value is not known (e.g.  TWAMP

      Light), the choice of the DSCP is implementation specific.  For

      instance, Session-Reflector MAY copy the DSCP value from the

      received test packet and set it as DSCP in a reflected packet.

Question:

What about the ECN value?   From 3168:

      +-----+-----+

      | ECN FIELD |

      +-----+-----+

        ECT   CE         [Obsolete] RFC 2481 names for the ECN bits.

         0     0         Not-ECT

         0     1         ECT(1)

         1     0         ECT(0)

         1     1         CE

It makes little sense to copy a "11" =3D=3D CE into the reflected packet,

and it may affect the measured performance if "11" were copied.

The draft needs more guidance here (there is a general problem

when the negotiated values are "not known"; this does not apply

to the Standards Track TWAMP protocol or its extensions).

GIM>> Added

ECN SHOULD be set to Not-ECT codepoint value [RFC3168].

-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-



Editorial comments/suggestions:



OLD

2.2.  TWAMP-Test Extension



   Monitoring of DSCP and ECN requires support by the Session-Reflector

   and changes the format of its test packet format both in

   unauthenticated, authenticated and encrypted modes.

Suggest:

   Monitoring of DSCP and ECN requires support by the Session-Reflector

   and changes the test packet format in all the original

   (unauthenticated, authenticated and encrypted) modes.



GIM=1B$B"d=1B(B Thank you, accepted.

2.2.1



OLD

   o  the first six bits of the Differentiated Service field MUST be

      copied from received Session-Sender test packet into Sender DSCP

      (S-DSCP) field;



   o  the following two bits of the ECN field MUST be copied from

      received Session-Sender test packet into Sender ECN (S-ECN) field.

Suggest:

   o  the six (least-significant) bits of the Differentiated Service field =
MUST be

      copied from received Session-Sender test packet into Sender DSCP

      (S-DSCP) field;



   o  the two bits of the ECN field MUST be copied from

      received Session-Sender test packet into Sender ECN (S-ECN) field.

GIM=1B$B"d=1B(B Thank you. Accepted.



because RFC 3168 defines:

         0     1     2     3     4     5     6     7

      +-----+-----+-----+-----+-----+-----+-----+-----+

      |          DS FIELD, DSCP           | ECN FIELD |

      +-----+-----+-----+-----+-----+-----+-----+-----+



        DSCP: differentiated services codepoint

        ECN:  Explicit Congestion Notification



      Figure 2: The Differentiated Services and ECN Fields in IP.

-=3D-=3D-=3D-=3D-=3D-=3D-=3D-



OLD

    0     1     2     3     4     5     6     7     8

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    |               S-DSCP              |   S-ECN   |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



                Figure 1: Sender DSCP and ECN field format



Suggest:

The extra "+" within bit positions are distracting,

and don't conform to the conventions of these diagrams.

Also, there's no "8" when numbering from 0.

GIM=1B$B"d=1B(B Agree. New version:

      0   1   2   3   4   5   6   7
    +---+---+---+---+---+---+---+---+
    |         S-DSCP        | S-ECN |
    +---+---+---+---+---+---+---+---+

                Figure 1: Sender DSCP and ECN field format





Some attempt should be made to put Figure 3 on a single page in the

final version. There's one line taken up by "+" that is unnecessary

in the modified field:

GIM=1B$B"d=1B(B That turned to be rather difficult, considering that the or=
iginal figure in RFC 5357 is over one page already. I've tried to move figu=
re to the very top though.

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    | Sender TTL  |  S-DSCP-ECN   |                               |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +

    |                                                             |

>> +                                                             + <<

    |                       MBZ (14 octets)                       |

    |                                                             |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+







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<html xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-micr=
osoft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" xmlns=3D"http:=
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<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue vli=
nk=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span style=3D'f=
ont-family:"Courier New";color:black'>You can probably find a line similar =
to this, just before &lt;front&gt;:<o:p></o:p></span></p><p class=3DMsoNorm=
al><span style=3D'font-family:"Courier New";color:black'><o:p>&nbsp;</o:p><=
/span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New";col=
or:black'>&lt;rfc category=3D&quot;info&quot; docName=3D&quot;draft-morton-=
ippm-2330-stdform-typep-01&quot;<o:p></o:p></span></p><p class=3DMsoNormal>=
<span style=3D'font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nb=
sp; ipr=3D&quot;trust200902&quot; updates=3D&quot;2330&quot;&gt;<o:p></o:p>=
</span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New";co=
lor:black'>&nbsp; &lt;front&gt;<o:p></o:p></span></p><p class=3DMsoNormal><=
span style=3D'font-family:"Courier New";color:black'><o:p>&nbsp;</o:p></spa=
n></p><div style=3D'border:none;border-left:solid blue 1.5pt;padding:0in 0i=
n 0in 4.0pt'><div><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;=
padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b><span style=3D'font-size=
:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style=3D'f=
ont-size:10.0pt;font-family:"Tahoma","sans-serif"'> ippm [mailto:ippm-bounc=
es@ietf.org] <b>On Behalf Of </b>Gregory Mirsky<br><b>Sent:</b> Wednesday, =
October 21, 2015 9:43 PM<br><b>To:</b> MORTON, ALFRED C (AL); draft-ietf-ip=
pm-type-p-monitor.all@tools.ietf.org; ops-dir@ietf.org<br><b>Cc:</b> ops-ad=
s@tools.ietf.org; ippm@ietf.org<br><b>Subject:</b> Re: [ippm] OPS-DIR Revie=
w: draft-ietf-ippm-type-p-monitor-02<o:p></o:p></span></p></div></div><p cl=
ass=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span style=3D'co=
lor:#1F497D'>Hi Al,<o:p></o:p></span></p><p class=3DMsoNormal><span style=
=3D'color:#1F497D'>yes, forgot about that comment. I do need help with the =
XML and greatly appreciate your help.<o:p></o:p></span></p><p class=3DMsoNo=
rmal><span style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><p class=3DM=
soNormal><span style=3D'color:#1F497D'>I=1B$B!G=1B(Bll work on addressing o=
ther suggestions.<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'=
color:#1F497D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span style=
=3D'color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regards,<o:p></o:p></span></p><p class=
=3DMsoNormal><span style=3D'color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; Greg<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'color:#1=
F497D'><o:p>&nbsp;</o:p></span></p><div><div style=3D'border:none;border-to=
p:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b><s=
pan style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</spa=
n></b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> M=
ORTON, ALFRED C (AL) [<a href=3D"mailto:acmorton@att.com">mailto:acmorton@a=
tt.com</a>] <br><b>Sent:</b> Wednesday, October 21, 2015 6:35 PM<br><b>To:<=
/b> Gregory Mirsky; <a href=3D"mailto:draft-ietf-ippm-type-p-monitor.all@to=
ols.ietf.org">draft-ietf-ippm-type-p-monitor.all@tools.ietf.org</a>; <a hre=
f=3D"mailto:ops-dir@ietf.org">ops-dir@ietf.org</a><br><b>Cc:</b> <a href=3D=
"mailto:ops-ads@tools.ietf.org">ops-ads@tools.ietf.org</a>; <a href=3D"mail=
to:ippm@ietf.org">ippm@ietf.org</a><br><b>Subject:</b> RE: OPS-DIR Review: =
draft-ietf-ippm-type-p-monitor-02<o:p></o:p></span></p></div></div><p class=
=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span style=3D'font-=
family:"Courier New";color:black'>Hi Greg,<o:p></o:p></span></p><p class=3D=
MsoNormal><span style=3D'font-family:"Courier New";color:black'><o:p>&nbsp;=
</o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier N=
ew";color:black'>I don=1B$B!G=1B(Bt think you addressed this comment:<o:p><=
/o:p></span></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMso=
PlainText>The draft header should indicate that this draft updates RFC 5357=
.<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMso=
Normal><span style=3D'font-family:"Courier New";color:black'>If you need he=
lp with the XML formatting to do this,<o:p></o:p></span></p><p class=3DMsoN=
ormal><span style=3D'font-family:"Courier New";color:black'>let me know.<o:=
p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier=
 New";color:black'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span s=
tyle=3D'font-family:"Courier New";color:black'>In the draft, the section th=
at moved needs a bit more <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-family:"Courier New";color:black'>editing, IMO:<o:p></o:p></s=
pan></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New";color=
:black'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span style=3D'fon=
t-family:"Courier New";color:black'>&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The D=
SCP value is often copied into reflected test packets with&nbsp;&nbsp;&nbsp=
;&nbsp; <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-fami=
ly:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;current TWAMP implemen=
tations (with or without TWAMP-Control <o:p></o:p></span></p><p class=3DMso=
Normal><span style=3D'font-family:"Courier New";color:black'>I would claim =
this is only <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font=
-family:"Courier New";color:black'>true for the =1B$B!H=1B(Bwithout control=
=1B$B!I=1B(B case, <o:p></o:p></span></p><p class=3DMsoNormal><span style=
=3D'font-family:"Courier New";color:black'>so s/with or without/without/<o:=
p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier=
 New";color:black'>( I must have read this as =1B$B!H=1B(Bwithout=1B$B!I=1B=
(B <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"C=
ourier New";color:black'>previously, I have knowledge of many <o:p></o:p></=
span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New";colo=
r:black'>deployed TWAMP nodes.)<o:p></o:p></span></p><p class=3DMsoNormal><=
span style=3D'font-family:"Courier New";color:black'><o:p>&nbsp;</o:p></spa=
n></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New";color:b=
lack'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&n=
bsp;&nbsp; &nbsp;&nbsp;&nbsp;protocol).&nbsp; With DSCP and ECN Monitoring =
Extension, the Session-&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p><p cl=
ass=3DMsoNormal><span style=3D'font-family:"Courier New";color:black'>&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; =
&nbsp;&nbsp;&nbsp;Reflector handles DSCP as following:&nbsp;&nbsp;&nbsp; <o=
:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courie=
r New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></s=
pan></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New";color=
:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;=
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; the Session-Reflector MUST ext=
ract the S-DSCP-ECN value from the&nbsp; <o:p></o:p></span></p><p class=3DM=
soNormal><span style=3D'font-family:"Courier New";color:black'>&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;DSCP and ECN values of received packets;&nbsp;=
 <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Cou=
rier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p>=
</span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New";co=
lor:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nb=
sp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; the Session-Reflector MUST =
transmit each reflected test packet&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></sp=
an></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New";color:=
black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&=
nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;with DSCP set to the negoti=
ated/provisioned value;&nbsp;&nbsp; <o:p></o:p></span></p><p class=3DMsoNor=
mal><span style=3D'font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p><p class=3DMsoNormal><span st=
yle=3D'font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;=
o&nbsp; if the negotiated/provisioned DSCP value is not known (e.g.&nbsp; T=
WAMP <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:=
"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Light),=
 the choice of the DSCP is implementation specific.&nbsp; For&nbsp; <o:p></=
o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New=
";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;instance, Session-R=
eflector MAY copy the DSCP value from the&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:=
p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New";=
color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &=
nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;received test packet and se=
t it as DSCP in a reflected packet.&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></sp=
an></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New";color:=
black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p><p cl=
ass=3DMsoNormal><span style=3D'font-family:"Courier New";color:black'>&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&=
nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; ECN SHOULD be set to Not-ECT codepoint valu=
e [RFC3168].&nbsp;&nbsp; <o:p></o:p></span></p><p class=3DMsoNormal><span s=
tyle=3D'font-family:"Courier New";color:black'><o:p>&nbsp;</o:p></span></p>=
<p class=3DMsoNormal><span style=3D'font-family:"Courier New";color:black'>=
I think this (new) last bullet needs to read:<o:p></o:p></span></p><p class=
=3DMsoNormal><span style=3D'font-family:"Courier New";color:black'>o&nbsp; =
if the negotiated/provisioned ECN value is not known,<o:p></o:p></span></p>=
<p class=3DMsoNormal><span style=3D'font-family:"Courier New";color:black'>=
&nbsp;&nbsp; ECN SHOULD be set to Not-ECT codepoint value [RFC3168].<o:p></=
o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier New=
";color:black'>&nbsp;&nbsp; Otherwise, the provisioned ECN value for the se=
ssion SHALL be used.<o:p></o:p></span></p><p class=3DMsoNormal><span style=
=3D'font-family:"Courier New";color:black'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp; <o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-fam=
ily:"Courier New";color:black'>hope this helps,<o:p></o:p></span></p><p cla=
ss=3DMsoNormal><span style=3D'font-family:"Courier New";color:black'>Al<o:p=
></o:p></span></p><p class=3DMsoNormal><span style=3D'font-family:"Courier =
New";color:black'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span st=
yle=3D'font-family:"Courier New";color:black'><o:p>&nbsp;</o:p></span></p><=
p class=3DMsoNormal><span style=3D'font-family:"Courier New";color:black'><=
o:p>&nbsp;</o:p></span></p><div style=3D'border:none;border-left:solid blue=
 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style=3D'border:none;border-top=
:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b><sp=
an style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span=
></b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Gr=
egory Mirsky [<a href=3D"mailto:gregory.mirsky@ericsson.com">mailto:gregory=
.mirsky@ericsson.com</a>] <br><b>Sent:</b> Wednesday, October 21, 2015 6:19=
 PM<br><b>To:</b> MORTON, ALFRED C (AL); <a href=3D"mailto:draft-ietf-ippm-=
type-p-monitor.all@tools.ietf.org">draft-ietf-ippm-type-p-monitor.all@tools=
.ietf.org</a>; <a href=3D"mailto:ops-dir@ietf.org">ops-dir@ietf.org</a><br>=
<b>Cc:</b> <a href=3D"mailto:ops-ads@tools.ietf.org">ops-ads@tools.ietf.org=
</a>; <a href=3D"mailto:ippm@ietf.org">ippm@ietf.org</a><br><b>Subject:</b>=
 RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02<o:p></o:p></span></p=
></div></div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoPlainT=
ext>Dear Al,<o:p></o:p></p><p class=3DMsoPlainText>thank you for your thoro=
ugh review and thoughtful comments. I've prepared the new version to respon=
d to all comments but from Kathleen Moriarty (need some extra time).<o:p></=
o:p></p><p class=3DMsoPlainText>Would greatly appreciate your review of the=
 changes and hope that these address your comments.<o:p></o:p></p><p class=
=3DMsoPlainText>Please find my answers below in-line and tagged GIM&gt;&gt;=
.<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMso=
PlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; Regards,<o:p></o:p></p><p class=3DMsoPlainText>&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Greg<o:p></o:p></p><p class=3DMsoPlainTe=
xt><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>-----Original Message-----<=
br>From: MORTON, ALFRED C (AL) [<a href=3D"mailto:acmorton@att.com">mailto:=
acmorton@att.com</a>] <br>Sent: Monday, October 19, 2015 2:13 PM<br>To: <a =
href=3D"mailto:draft-ietf-ippm-type-p-monitor.all@tools.ietf.org">draft-iet=
f-ippm-type-p-monitor.all@tools.ietf.org</a>; <a href=3D"mailto:ops-dir@iet=
f.org">ops-dir@ietf.org</a><br>Cc: <a href=3D"mailto:ops-ads@tools.ietf.org=
">ops-ads@tools.ietf.org</a>; <a href=3D"mailto:ippm@ietf.org">ippm@ietf.or=
g</a><br>Subject: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02<o:p></o=
:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText=
>OPS-DIR, Authors, <o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p>=
</p><p class=3DMsoPlainText>I have reviewed this document as part of the Op=
erational directorate's ongoing effort to review all IETF documents being p=
rocessed by the IESG.&nbsp; <o:p></o:p></p><p class=3DMsoPlainText>These co=
mments were written primarily for the benefit of the operational area direc=
tors. Document editors and WG chairs should treat these comments just like =
any other last call comments.<o:p></o:p></p><p class=3DMsoPlainText><o:p>&n=
bsp;</o:p></p><p class=3DMsoPlainText>Al<o:p></o:p></p><p class=3DMsoPlainT=
ext><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>Title:<o:p></o:p></p><p cl=
ass=3DMsoPlainText>Differentiated Service Code Point and Explicit Congestio=
n Notification<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; Monitoring in Two-Way Active Measurement Protocol (TWAMP)<o:=
p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; draft=
-ietf-ippm-type-p-monitor-02<o:p></o:p></p><p class=3DMsoPlainText><a href=
=3D"https://tools.ietf.org/html/draft-ietf-ippm-type-p-monitor-02"><span st=
yle=3D'color:windowtext;text-decoration:none'>https://tools.ietf.org/html/d=
raft-ietf-ippm-type-p-monitor-02</span></a><o:p></o:p></p><p class=3DMsoPla=
inText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>Summary: Almost ready, =
comments and editorial suggestions follow.<o:p></o:p></p><p class=3DMsoPlai=
nText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>The draft header should =
indicate that this draft updates RFC 5357.<o:p></o:p></p><p class=3DMsoPlai=
nText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>Section 2.2.1<o:p></o:p>=
</p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText>Fi=
gure 1 has a number of canonical references that should <o:p></o:p></p><p c=
lass=3DMsoPlainText>be cited to ensure IPv4 and IPv6 applicability, includi=
ng <o:p></o:p></p><p class=3DMsoPlainText>RFC 2474, RFC 3168, and other rel=
evant updates (of which <o:p></o:p></p><p class=3DMsoPlainText>there are ma=
ny).<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3D=
MsoPlainText>&lt;later&gt;<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbs=
p; o&nbsp; if the negotiated/provisioned DSCP value is not known (e.g.&nbsp=
; TWAMP<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
; Light), the choice of the DSCP is implementation specific.&nbsp; For<o:p>=
</o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; instance, =
Session-Reflector MAY copy the DSCP value from the<o:p></o:p></p><p class=
=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received test packet and set=
 it as DSCP in a reflected packet.<o:p></o:p></p><p class=3DMsoPlainText>Qu=
estion:<o:p></o:p></p><p class=3DMsoPlainText>What about the ECN value?&nbs=
p;&nbsp; From 3168:<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; +-----+-----+<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp; | ECN FIELD |<o:p></o:p></p><p class=3DMsoPlainText>&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; +-----+-----+<o:p></o:p></p><p class=3DMsoPla=
inText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECT&nbsp;&nbsp; CE&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [Obsolete] RFC 2481 names for the=
 ECN bits.<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; Not-ECT<o:p></o:p></p><p class=3DMsoPlainText>&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp; 1&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECT(1)<o:p></o:p></p><p class=
=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nb=
sp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECT(0)<o:=
p></o:p></p><p class=3DMsoPlainText>&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;1&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; CE<o:p></o:p></p><p class=3DMsoPlainText>It makes little sense t=
o copy a &quot;11&quot; =3D=3D CE into the reflected packet,<o:p></o:p></p>=
<p class=3DMsoPlainText>and it may affect the measured performance if &quot=
;11&quot; were copied.<o:p></o:p></p><p class=3DMsoPlainText>The draft need=
s more guidance here (there is a general problem<o:p></o:p></p><p class=3DM=
soPlainText>when the negotiated values are &quot;not known&quot;; this does=
 not apply <o:p></o:p></p><p class=3DMsoPlainText>to the Standards Track TW=
AMP protocol or its extensions).<o:p></o:p></p><p class=3DMsoPlainText>GIM&=
gt;&gt; Added<o:p></o:p></p><p class=3DMsoPlainText style=3D'margin-left:.5=
in'><span style=3D'color:black'>ECN SHOULD be set to Not-ECT codepoint valu=
e [RFC3168].<o:p></o:p></span></p><p class=3DMsoPlainText>-=3D-=3D-=3D-=3D-=
=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-<o:p></o:p></p><p class=3DMsoPlainText><o:p=
>&nbsp;</o:p></p><p class=3DMsoPlainText>Editorial comments/suggestions:<o:=
p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlai=
nText>OLD<o:p></o:p></p><p class=3DMsoPlainText>2.2.&nbsp; TWAMP-Test Exten=
sion<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3D=
MsoPlainText>&nbsp;&nbsp; Monitoring of DSCP and ECN requires support by th=
e Session-Reflector<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp; and =
changes the format of its test packet format both in<o:p></o:p></p><p class=
=3DMsoPlainText>&nbsp;&nbsp; unauthenticated, authenticated and encrypted m=
odes. <o:p></o:p></p><p class=3DMsoPlainText>Suggest:<o:p></o:p></p><p clas=
s=3DMsoPlainText>&nbsp;&nbsp; Monitoring of DSCP and ECN requires support b=
y the Session-Reflector<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp; =
and changes the test packet format in all the original<o:p></o:p></p><p cla=
ss=3DMsoPlainText>&nbsp;&nbsp; (unauthenticated, authenticated and encrypte=
d) modes. <o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p cl=
ass=3DMsoPlainText><span style=3D'color:black'>GIM</span><span style=3D'fon=
t-family:"Cambria Math","serif";color:black'>=1B$B"d=1B(B</span><span style=
=3D'color:black'> Thank you, accepted.<o:p></o:p></span></p><p class=3DMsoP=
lainText>2.2.1<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><=
p class=3DMsoPlainText>OLD<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbs=
p; o&nbsp; the first six bits of the Differentiated Service field MUST be<o=
:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; copied =
from received Session-Sender test packet into Sender DSCP<o:p></o:p></p><p =
class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (S-DSCP) field;<o:p></o=
:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPlainText=
>&nbsp;&nbsp; o&nbsp; the following two bits of the ECN field MUST be copie=
d from<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 received Session-Sender test packet into Sender ECN (S-ECN) field.<o:p></o=
:p></p><p class=3DMsoPlainText>Suggest:<o:p></o:p></p><p class=3DMsoPlainTe=
xt>&nbsp;&nbsp; o&nbsp; the six (least-significant) bits of the Differentia=
ted Service field MUST be<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp; copied from received Session-Sender test packet into Se=
nder DSCP<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; (S-DSCP) field;<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p>=
</p><p class=3DMsoPlainText>&nbsp;&nbsp; o&nbsp; the two bits of the ECN fi=
eld MUST be copied from<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp; received Session-Sender test packet into Sender ECN (S-EC=
N) field.<o:p></o:p></p><p class=3DMsoPlainText><span style=3D'color:black'=
>GIM</span><span style=3D'font-family:"Cambria Math","serif";color:black'>=
=1B$B"d=1B(B</span><span style=3D'color:black'> Thank you. Accepted.<o:p></=
o:p></span></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoP=
lainText>because RFC 3168 defines:<o:p></o:p></p><p class=3DMsoPlainText>&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;0&nbsp;&nbsp;&nbsp;&nbsp; 1&=
nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp; 3&nbsp;&nbsp;&nbsp;&nbsp;=
 4&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&nbsp;&nbsp;&nbsp; 6&nbsp;&nbsp;&nbsp;&nb=
sp; 7<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
+-----+-----+-----+-----+-----+-----+-----+-----+<o:p></o:p></p><p class=3D=
MsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; DS FIELD, DSCP&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp; | ECN FIELD |<o:p></o:p></p><p class=3DMsoPlainTex=
t>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; +-----+-----+-----+-----+-----+-----+-----=
+-----+<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=
=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DSCP: differenti=
ated services codepoint<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECN:&nbsp; Explicit Congestion Notification<o=
:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p class=3DMsoPla=
inText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 2: The Differentiated Services=
 and ECN Fields in IP.<o:p></o:p></p><p class=3DMsoPlainText>-=3D-=3D-=3D-=
=3D-=3D-=3D-=3D-<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p=
><p class=3DMsoPlainText>OLD<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&n=
bsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp=
;&nbsp;&nbsp; 3&nbsp;&nbsp;&nbsp;&nbsp; 4&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&n=
bsp;&nbsp;&nbsp; 6&nbsp;&nbsp;&nbsp;&nbsp; 7&nbsp;&nbsp;&nbsp;&nbsp; 8<o:p>=
</o:p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; +-+-+-+-+-+-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+-+-+-+<o:p></o:p></p><p class=3DMsoPlainText>&nbsp;&nb=
sp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; S-DSCP&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp; S-ECN&nbsp;&nbsp; |<o:p></o:p>=
</p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; +-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+-+-+-+-+-+-+-+-+-+-+<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:=
p></p><p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 1: Sender DSCP and ECN=
 field format<o:p></o:p></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p=
 class=3DMsoPlainText>Suggest:<o:p></o:p></p><p class=3DMsoPlainText>The ex=
tra &quot;+&quot; within bit positions are distracting,<o:p></o:p></p><p cl=
ass=3DMsoPlainText>and don't conform to the conventions of these diagrams.<=
o:p></o:p></p><p class=3DMsoPlainText>Also, there's no &quot;8&quot; when n=
umbering from 0.<o:p></o:p></p><p class=3DMsoPlainText><span style=3D'color=
:black'>GIM</span><span style=3D'font-family:"Cambria Math","serif";color:b=
lack'>=1B$B"d=1B(B</span><span style=3D'color:black'> Agree. New version:<o=
:p></o:p></span></p><p class=3DMsoPlainText><span style=3D'font-family:"Cou=
rier New"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; 1&nbsp;&nbsp; 2&nbs=
p;&nbsp; 3&nbsp;&nbsp; 4&nbsp;&nbsp; 5&nbsp;&nbsp; 6&nbsp;&nbsp; 7<br>&nbsp=
;&nbsp;&nbsp; +---+---+---+---+---+---+---+---+<br>&nbsp;&nbsp;&nbsp; |&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S-DSCP&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | S-ECN |<br>&nbsp;&nbsp;&nbsp; +---+---+---+---+---+---=
+---+---+<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 1: Sender DSCP and ECN field format=
</span><o:p></o:p></p><p class=3DMsoPlainText><span style=3D'color:black'><=
o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><o:p>&nbsp;</o:p></p><p =
class=3DMsoPlainText>Some attempt should be made to put Figure 3 on a singl=
e page in the <o:p></o:p></p><p class=3DMsoPlainText>final version. There's=
 one line taken up by &quot;+&quot; that is unnecessary<o:p></o:p></p><p cl=
ass=3DMsoPlainText>in the modified field:<o:p></o:p></p><p class=3DMsoPlain=
Text>GIM<span style=3D'font-family:"Cambria Math","serif"'>=1B$B"d=1B(B</sp=
an> That turned to be rather difficult, considering that the original figur=
e in RFC 5357 is over one page already. I've tried to move figure to the ve=
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<p class=3DMsoPlainText>&nbsp;&nbsp;&nbsp; | Sender TTL&nbsp; |&nbsp; S-DSC=
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bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
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p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp; MBZ (14 octets)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, "draft-ietf-ippm-type-p-monitor.all@tools.ietf.org" <draft-ietf-ippm-type-p-monitor.all@tools.ietf.org>, "ops-dir@ietf.org" <ops-dir@ietf.org>
Thread-Topic: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02
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Many thanks!

From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com]
Sent: Wednesday, October 21, 2015 6:51 PM
To: Gregory Mirsky; draft-ietf-ippm-type-p-monitor.all@tools.ietf.org; ops-=
dir@ietf.org
Cc: ops-ads@tools.ietf.org; ippm@ietf.org
Subject: RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02

You can probably find a line similar to this, just before <front>:

<rfc category=3D"info" docName=3D"draft-morton-ippm-2330-stdform-typep-01"
     ipr=3D"trust200902" updates=3D"2330">
  <front>

From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Gregory Mirsky
Sent: Wednesday, October 21, 2015 9:43 PM
To: MORTON, ALFRED C (AL); draft-ietf-ippm-type-p-monitor.all@tools.ietf.or=
g<mailto:draft-ietf-ippm-type-p-monitor.all@tools.ietf.org>; ops-dir@ietf.o=
rg<mailto:ops-dir@ietf.org>
Cc: ops-ads@tools.ietf.org<mailto:ops-ads@tools.ietf.org>; ippm@ietf.org<ma=
ilto:ippm@ietf.org>
Subject: Re: [ippm] OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02

Hi Al,
yes, forgot about that comment. I do need help with the XML and greatly app=
reciate your help.

I=1B$B!G=1B(Bll work on addressing other suggestions.

                Regards,
                                Greg

From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com]
Sent: Wednesday, October 21, 2015 6:35 PM
To: Gregory Mirsky; draft-ietf-ippm-type-p-monitor.all@tools.ietf.org<mailt=
o:draft-ietf-ippm-type-p-monitor.all@tools.ietf.org>; ops-dir@ietf.org<mail=
to:ops-dir@ietf.org>
Cc: ops-ads@tools.ietf.org<mailto:ops-ads@tools.ietf.org>; ippm@ietf.org<ma=
ilto:ippm@ietf.org>
Subject: RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02

Hi Greg,

I don=1B$B!G=1B(Bt think you addressed this comment:



The draft header should indicate that this draft updates RFC 5357.


If you need help with the XML formatting to do this,
let me know.

In the draft, the section that moved needs a bit more
editing, IMO:

                   The DSCP value is often copied into reflected test packe=
ts with
                  current TWAMP implementations (with or without TWAMP-Cont=
rol
I would claim this is only
true for the =1B$B!H=1B(Bwithout control=1B$B!I=1B(B case,
so s/with or without/without/
( I must have read this as =1B$B!H=1B(Bwithout=1B$B!I=1B(B
previously, I have knowledge of many
deployed TWAMP nodes.)

                  protocol).  With DSCP and ECN Monitoring Extension, the S=
ession-
                  Reflector handles DSCP as following:

                   o  the Session-Reflector MUST extract the S-DSCP-ECN val=
ue from the
                     DSCP and ECN values of received packets;

                   o  the Session-Reflector MUST transmit each reflected te=
st packet
                     with DSCP set to the negotiated/provisioned value;

                   o  if the negotiated/provisioned DSCP value is not known=
 (e.g.  TWAMP
                     Light), the choice of the DSCP is implementation speci=
fic.  For
                     instance, Session-Reflector MAY copy the DSCP value fr=
om the
                    received test packet and set it as DSCP in a reflected =
packet.

                   o  ECN SHOULD be set to Not-ECT codepoint value [RFC3168=
].

I think this (new) last bullet needs to read:
o  if the negotiated/provisioned ECN value is not known,
   ECN SHOULD be set to Not-ECT codepoint value [RFC3168].
   Otherwise, the provisioned ECN value for the session SHALL be used.

hope this helps,
Al



From: Gregory Mirsky [mailto:gregory.mirsky@ericsson.com]
Sent: Wednesday, October 21, 2015 6:19 PM
To: MORTON, ALFRED C (AL); draft-ietf-ippm-type-p-monitor.all@tools.ietf.or=
g<mailto:draft-ietf-ippm-type-p-monitor.all@tools.ietf.org>; ops-dir@ietf.o=
rg<mailto:ops-dir@ietf.org>
Cc: ops-ads@tools.ietf.org<mailto:ops-ads@tools.ietf.org>; ippm@ietf.org<ma=
ilto:ippm@ietf.org>
Subject: RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02


Dear Al,

thank you for your thorough review and thoughtful comments. I've prepared t=
he new version to respond to all comments but from Kathleen Moriarty (need =
some extra time).

Would greatly appreciate your review of the changes and hope that these add=
ress your comments.

Please find my answers below in-line and tagged GIM>>.



                Regards,

                                Greg



-----Original Message-----
From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com]
Sent: Monday, October 19, 2015 2:13 PM
To: draft-ietf-ippm-type-p-monitor.all@tools.ietf.org<mailto:draft-ietf-ipp=
m-type-p-monitor.all@tools.ietf.org>; ops-dir@ietf.org<mailto:ops-dir@ietf.=
org>
Cc: ops-ads@tools.ietf.org<mailto:ops-ads@tools.ietf.org>; ippm@ietf.org<ma=
ilto:ippm@ietf.org>
Subject: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02



OPS-DIR, Authors,



I have reviewed this document as part of the Operational directorate's ongo=
ing effort to review all IETF documents being processed by the IESG.

These comments were written primarily for the benefit of the operational ar=
ea directors. Document editors and WG chairs should treat these comments ju=
st like any other last call comments.



Al



Title:

Differentiated Service Code Point and Explicit Congestion Notification

       Monitoring in Two-Way Active Measurement Protocol (TWAMP)

                   draft-ietf-ippm-type-p-monitor-02

https://tools.ietf.org/html/draft-ietf-ippm-type-p-monitor-02



Summary: Almost ready, comments and editorial suggestions follow.



The draft header should indicate that this draft updates RFC 5357.



Section 2.2.1



Figure 1 has a number of canonical references that should

be cited to ensure IPv4 and IPv6 applicability, including

RFC 2474, RFC 3168, and other relevant updates (of which

there are many).



<later>

   o  if the negotiated/provisioned DSCP value is not known (e.g.  TWAMP

      Light), the choice of the DSCP is implementation specific.  For

      instance, Session-Reflector MAY copy the DSCP value from the

      received test packet and set it as DSCP in a reflected packet.

Question:

What about the ECN value?   From 3168:

      +-----+-----+

      | ECN FIELD |

      +-----+-----+

        ECT   CE         [Obsolete] RFC 2481 names for the ECN bits.

         0     0         Not-ECT

         0     1         ECT(1)

         1     0         ECT(0)

         1     1         CE

It makes little sense to copy a "11" =3D=3D CE into the reflected packet,

and it may affect the measured performance if "11" were copied.

The draft needs more guidance here (there is a general problem

when the negotiated values are "not known"; this does not apply

to the Standards Track TWAMP protocol or its extensions).

GIM>> Added

ECN SHOULD be set to Not-ECT codepoint value [RFC3168].

-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-



Editorial comments/suggestions:



OLD

2.2.  TWAMP-Test Extension



   Monitoring of DSCP and ECN requires support by the Session-Reflector

   and changes the format of its test packet format both in

   unauthenticated, authenticated and encrypted modes.

Suggest:

   Monitoring of DSCP and ECN requires support by the Session-Reflector

   and changes the test packet format in all the original

   (unauthenticated, authenticated and encrypted) modes.



GIM=1B$B"d=1B(B Thank you, accepted.

2.2.1



OLD

   o  the first six bits of the Differentiated Service field MUST be

      copied from received Session-Sender test packet into Sender DSCP

      (S-DSCP) field;



   o  the following two bits of the ECN field MUST be copied from

      received Session-Sender test packet into Sender ECN (S-ECN) field.

Suggest:

   o  the six (least-significant) bits of the Differentiated Service field =
MUST be

      copied from received Session-Sender test packet into Sender DSCP

      (S-DSCP) field;



   o  the two bits of the ECN field MUST be copied from

      received Session-Sender test packet into Sender ECN (S-ECN) field.

GIM=1B$B"d=1B(B Thank you. Accepted.



because RFC 3168 defines:

         0     1     2     3     4     5     6     7

      +-----+-----+-----+-----+-----+-----+-----+-----+

      |          DS FIELD, DSCP           | ECN FIELD |

      +-----+-----+-----+-----+-----+-----+-----+-----+



        DSCP: differentiated services codepoint

        ECN:  Explicit Congestion Notification



      Figure 2: The Differentiated Services and ECN Fields in IP.

-=3D-=3D-=3D-=3D-=3D-=3D-=3D-



OLD

    0     1     2     3     4     5     6     7     8

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    |               S-DSCP              |   S-ECN   |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



                Figure 1: Sender DSCP and ECN field format



Suggest:

The extra "+" within bit positions are distracting,

and don't conform to the conventions of these diagrams.

Also, there's no "8" when numbering from 0.

GIM=1B$B"d=1B(B Agree. New version:

      0   1   2   3   4   5   6   7
    +---+---+---+---+---+---+---+---+
    |         S-DSCP        | S-ECN |
    +---+---+---+---+---+---+---+---+

                Figure 1: Sender DSCP and ECN field format





Some attempt should be made to put Figure 3 on a single page in the

final version. There's one line taken up by "+" that is unnecessary

in the modified field:

GIM=1B$B"d=1B(B That turned to be rather difficult, considering that the or=
iginal figure in RFC 5357 is over one page already. I've tried to move figu=
re to the very top though.

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    | Sender TTL  |  S-DSCP-ECN   |                               |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +

    |                                                             |

>> +                                                             + <<

    |                       MBZ (14 octets)                       |

    |                                                             |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+







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	{size:8.5in 11.0in;
	margin:1.0in 1.0in 1.0in 1.0in;}
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	{page:WordSection1;}
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<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Many thanks!<o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> MORTON, =
ALFRED C (AL) [mailto:acmorton@att.com]
<br>
<b>Sent:</b> Wednesday, October 21, 2015 6:51 PM<br>
<b>To:</b> Gregory Mirsky; draft-ietf-ippm-type-p-monitor.all@tools.ietf.or=
g; ops-dir@ietf.org<br>
<b>Cc:</b> ops-ads@tools.ietf.org; ippm@ietf.org<br>
<b>Subject:</b> RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">You can probably find a line similar to this, just before &lt;f=
ront&gt;:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&lt;rfc category=3D&quot;info&quot; docName=3D&quot;draft-morto=
n-ippm-2330-stdform-typep-01&quot;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp; ipr=3D&quot;trust200902&quot; updates=
=3D&quot;2330&quot;&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp; &lt;front&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> ippm [<a=
 href=3D"mailto:ippm-bounces@ietf.org">mailto:ippm-bounces@ietf.org</a>]
<b>On Behalf Of </b>Gregory Mirsky<br>
<b>Sent:</b> Wednesday, October 21, 2015 9:43 PM<br>
<b>To:</b> MORTON, ALFRED C (AL); <a href=3D"mailto:draft-ietf-ippm-type-p-=
monitor.all@tools.ietf.org">
draft-ietf-ippm-type-p-monitor.all@tools.ietf.org</a>; <a href=3D"mailto:op=
s-dir@ietf.org">
ops-dir@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:ops-ads@tools.ietf.org">ops-ads@tools.ietf.org=
</a>; <a href=3D"mailto:ippm@ietf.org">
ippm@ietf.org</a><br>
<b>Subject:</b> Re: [ippm] OPS-DIR Review: draft-ietf-ippm-type-p-monitor-0=
2<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Al,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">yes, forgot about that=
 comment. I do need help with the XML and greatly appreciate your help.<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I=1B$B!G=1B(Bll work o=
n addressing other suggestions.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regard=
s,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; Greg<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> MORTON, =
ALFRED C (AL) [<a href=3D"mailto:acmorton@att.com">mailto:acmorton@att.com<=
/a>]
<br>
<b>Sent:</b> Wednesday, October 21, 2015 6:35 PM<br>
<b>To:</b> Gregory Mirsky; <a href=3D"mailto:draft-ietf-ippm-type-p-monitor=
.all@tools.ietf.org">
draft-ietf-ippm-type-p-monitor.all@tools.ietf.org</a>; <a href=3D"mailto:op=
s-dir@ietf.org">
ops-dir@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:ops-ads@tools.ietf.org">ops-ads@tools.ietf.org=
</a>; <a href=3D"mailto:ippm@ietf.org">
ippm@ietf.org</a><br>
<b>Subject:</b> RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">Hi Greg,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">I don=1B$B!G=1B(Bt think you addressed this comment:<o:p></o:p>=
</span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">The draft header should indicate that this draft =
updates RFC 5357.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">If you need help with the XML formatting to do this,<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">let me know.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">In the draft, the section that moved needs a bit more
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">editing, IMO:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The DSCP value is often copie=
d into reflected test packets with&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;current TWAMP implementations (with or w=
ithout TWAMP-Control
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">I would claim this is only
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">true for the =1B$B!H=1B(Bwithout control=1B$B!I=1B(B case,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">so s/with or without/without/<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">( I must have read this as =1B$B!H=1B(Bwithout=1B$B!I=1B(B
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">previously, I have knowledge of many
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">deployed TWAMP nodes.)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;protocol).&nbsp; With DSCP and ECN Monit=
oring Extension, the Session-&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;Reflector handles DSCP as following:&nbs=
p;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; the Session-Reflector MUST=
 extract the S-DSCP-ECN value from the&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;DSCP and ECN values of=
 received packets;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; the Session-Reflector MUST=
 transmit each reflected test packet&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;with DSCP set to the n=
egotiated/provisioned value;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; if the negotiated/provisio=
ned DSCP value is not known (e.g.&nbsp; TWAMP
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Light), the choice of =
the DSCP is implementation specific.&nbsp; For&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;instance, Session-Refl=
ector MAY copy the DSCP value from the&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;received test packet and set=
 it as DSCP in a reflected packet.&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; ECN SHOULD be set to Not-E=
CT codepoint value [RFC3168].&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">I think this (new) last bullet needs to read:<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">o&nbsp; if the negotiated/provisioned ECN value is not known,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp; ECN SHOULD be set to Not-ECT codepoint value [RFC3=
168].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp; Otherwise, the provisioned ECN value for the sessi=
on SHALL be used.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">hope this helps,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">Al<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Gregory =
Mirsky [<a href=3D"mailto:gregory.mirsky@ericsson.com">mailto:gregory.mirsk=
y@ericsson.com</a>]
<br>
<b>Sent:</b> Wednesday, October 21, 2015 6:19 PM<br>
<b>To:</b> MORTON, ALFRED C (AL); <a href=3D"mailto:draft-ietf-ippm-type-p-=
monitor.all@tools.ietf.org">
draft-ietf-ippm-type-p-monitor.all@tools.ietf.org</a>; <a href=3D"mailto:op=
s-dir@ietf.org">
ops-dir@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:ops-ads@tools.ietf.org">ops-ads@tools.ietf.org=
</a>; <a href=3D"mailto:ippm@ietf.org">
ippm@ietf.org</a><br>
<b>Subject:</b> RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Dear Al,<o:p></o:p></p>
<p class=3D"MsoPlainText">thank you for your thorough review and thoughtful=
 comments. I've prepared the new version to respond to all comments but fro=
m Kathleen Moriarty (need some extra time).<o:p></o:p></p>
<p class=3D"MsoPlainText">Would greatly appreciate your review of the chang=
es and hope that these address your comments.<o:p></o:p></p>
<p class=3D"MsoPlainText">Please find my answers below in-line and tagged G=
IM&gt;&gt;.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regards,<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Greg<o:p></o=
:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">-----Original Message-----<br>
From: MORTON, ALFRED C (AL) [<a href=3D"mailto:acmorton@att.com">mailto:acm=
orton@att.com</a>]
<br>
Sent: Monday, October 19, 2015 2:13 PM<br>
To: <a href=3D"mailto:draft-ietf-ippm-type-p-monitor.all@tools.ietf.org">dr=
aft-ietf-ippm-type-p-monitor.all@tools.ietf.org</a>;
<a href=3D"mailto:ops-dir@ietf.org">ops-dir@ietf.org</a><br>
Cc: <a href=3D"mailto:ops-ads@tools.ietf.org">ops-ads@tools.ietf.org</a>; <=
a href=3D"mailto:ippm@ietf.org">
ippm@ietf.org</a><br>
Subject: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">OPS-DIR, Authors, <o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">I have reviewed this document as part of the Oper=
ational directorate's ongoing effort to review all IETF documents being pro=
cessed by the IESG.&nbsp;
<o:p></o:p></p>
<p class=3D"MsoPlainText">These comments were written primarily for the ben=
efit of the operational area directors. Document editors and WG chairs shou=
ld treat these comments just like any other last call comments.<o:p></o:p><=
/p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Al<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Title:<o:p></o:p></p>
<p class=3D"MsoPlainText">Differentiated Service Code Point and Explicit Co=
ngestion Notification<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Monitoring i=
n Two-Way Active Measurement Protocol (TWAMP)<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; draft-ietf-ippm=
-type-p-monitor-02<o:p></o:p></p>
<p class=3D"MsoPlainText"><a href=3D"https://tools.ietf.org/html/draft-ietf=
-ippm-type-p-monitor-02"><span style=3D"color:windowtext;text-decoration:no=
ne">https://tools.ietf.org/html/draft-ietf-ippm-type-p-monitor-02</span></a=
><o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Summary: Almost ready, comments and editorial sug=
gestions follow.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">The draft header should indicate that this draft =
updates RFC 5357.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Section 2.2.1<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Figure 1 has a number of canonical references tha=
t should
<o:p></o:p></p>
<p class=3D"MsoPlainText">be cited to ensure IPv4 and IPv6 applicability, i=
ncluding
<o:p></o:p></p>
<p class=3D"MsoPlainText">RFC 2474, RFC 3168, and other relevant updates (o=
f which <o:p>
</o:p></p>
<p class=3D"MsoPlainText">there are many).<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&lt;later&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; if the negotiated/provisione=
d DSCP value is not known (e.g.&nbsp; TWAMP<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Light), the choice=
 of the DSCP is implementation specific.&nbsp; For<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; instance, Session-=
Reflector MAY copy the DSCP value from the<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received test pack=
et and set it as DSCP in a reflected packet.<o:p></o:p></p>
<p class=3D"MsoPlainText">Question:<o:p></o:p></p>
<p class=3D"MsoPlainText">What about the ECN value?&nbsp;&nbsp; From 3168:<=
o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;---=
--&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | ECN FIELD |<o:p>=
</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;---=
--&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECT&nb=
sp;&nbsp; CE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [Obsolete] RFC=
 2481 names for the ECN bits.<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
0&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 Not-ECT<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
0&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 ECT(1)<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
1&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 ECT(0)<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
1&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 CE<o:p></o:p></p>
<p class=3D"MsoPlainText">It makes little sense to copy a &quot;11&quot; =
=3D=3D CE into the reflected packet,<o:p></o:p></p>
<p class=3D"MsoPlainText">and it may affect the measured performance if &qu=
ot;11&quot; were copied.<o:p></o:p></p>
<p class=3D"MsoPlainText">The draft needs more guidance here (there is a ge=
neral problem<o:p></o:p></p>
<p class=3D"MsoPlainText">when the negotiated values are &quot;not known&qu=
ot;; this does not apply
<o:p></o:p></p>
<p class=3D"MsoPlainText">to the Standards Track TWAMP protocol or its exte=
nsions).<o:p></o:p></p>
<p class=3D"MsoPlainText">GIM&gt;&gt; Added<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:.5in"><span style=3D"color:b=
lack">ECN SHOULD be set to Not-ECT codepoint value [RFC3168].<o:p></o:p></s=
pan></p>
<p class=3D"MsoPlainText">-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Editorial comments/suggestions:<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">OLD<o:p></o:p></p>
<p class=3D"MsoPlainText">2.2.&nbsp; TWAMP-Test Extension<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; Monitoring of DSCP and ECN requires =
support by the Session-Reflector<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; and changes the format of its test p=
acket format both in<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; unauthenticated, authenticated and e=
ncrypted modes. <o:p>
</o:p></p>
<p class=3D"MsoPlainText">Suggest:<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; Monitoring of DSCP and ECN requires =
support by the Session-Reflector<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; and changes the test packet format i=
n all the original<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; (unauthenticated, authenticated and =
encrypted) modes. <o:p>
</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">GIM</span><span style=
=3D"font-family:&quot;Cambria Math&quot;,&quot;serif&quot;;color:black">=1B=
$B"d=1B(B</span><span style=3D"color:black"> Thank you, accepted.<o:p></o:p=
></span></p>
<p class=3D"MsoPlainText">2.2.1<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">OLD<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; the first six bits of the Di=
fferentiated Service field MUST be<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; copied from receiv=
ed Session-Sender test packet into Sender DSCP<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (S-DSCP) field;<o:=
p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; the following two bits of th=
e ECN field MUST be copied from<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received Session-S=
ender test packet into Sender ECN (S-ECN) field.<o:p></o:p></p>
<p class=3D"MsoPlainText">Suggest:<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; the six (least-significant) =
bits of the Differentiated Service field MUST be<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; copied from receiv=
ed Session-Sender test packet into Sender DSCP<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (S-DSCP) field;<o:=
p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; the two bits of the ECN fiel=
d MUST be copied from<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received Session-S=
ender test packet into Sender ECN (S-ECN) field.<o:p></o:p></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">GIM</span><span style=
=3D"font-family:&quot;Cambria Math&quot;,&quot;serif&quot;;color:black">=1B=
$B"d=1B(B</span><span style=3D"color:black"> Thank you. Accepted.<o:p></o:p=
></span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">because RFC 3168 defines:<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;=
0&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbs=
p; 3&nbsp;&nbsp;&nbsp;&nbsp; 4&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&nbsp;&nbsp;&=
nbsp; 6&nbsp;&nbsp;&nbsp;&nbsp; 7<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;---=
--&#43;-----&#43;-----&#43;-----&#43;-----&#43;-----&#43;-----&#43;<o:p></o=
:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DS FIELD, DSCP&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | ECN FIELD |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;---=
--&#43;-----&#43;-----&#43;-----&#43;-----&#43;-----&#43;-----&#43;<o:p></o=
:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DSCP: =
differentiated services codepoint<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECN:&n=
bsp; Explicit Congestion Notification<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 2: The Diff=
erentiated Services and ECN Fields in IP.<o:p></o:p></p>
<p class=3D"MsoPlainText">-=3D-=3D-=3D-=3D-=3D-=3D-=3D-<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">OLD<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp; 1&nb=
sp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp; 3&nbsp;&nbsp;&nbsp;&nbsp; 4=
&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&nbsp;&nbsp;&nbsp; 6&nbsp;&nbsp;&nbsp;&nbsp=
; 7&nbsp;&nbsp;&nbsp;&nbsp; 8<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S-DSCP&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&n=
bsp; S-ECN&nbsp;&nbsp; |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 1: Sender DSCP and ECN fie=
ld format<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Suggest:<o:p></o:p></p>
<p class=3D"MsoPlainText">The extra &quot;&#43;&quot; within bit positions =
are distracting,<o:p></o:p></p>
<p class=3D"MsoPlainText">and don't conform to the conventions of these dia=
grams.<o:p></o:p></p>
<p class=3D"MsoPlainText">Also, there's no &quot;8&quot; when numbering fro=
m 0.<o:p></o:p></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">GIM</span><span style=
=3D"font-family:&quot;Cambria Math&quot;,&quot;serif&quot;;color:black">=1B=
$B"d=1B(B</span><span style=3D"color:black"> Agree. New version:<o:p></o:p>=
</span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; 1&nbsp;&nbsp; 2&nbsp;&nbsp;=
 3&nbsp;&nbsp; 4&nbsp;&nbsp; 5&nbsp;&nbsp; 6&nbsp;&nbsp; 7<br>
&nbsp;&nbsp;&nbsp; &#43;---&#43;---&#43;---&#43;---&#43;---&#43;---&#43;---=
&#43;---&#43;<br>
&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S-DSCP=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | S-ECN |<br>
&nbsp;&nbsp;&nbsp; &#43;---&#43;---&#43;---&#43;---&#43;---&#43;---&#43;---=
&#43;---&#43;<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; Figure 1: Sender DSCP and ECN field format</span><o:p></o:p=
></p>
<p class=3D"MsoPlainText"><span style=3D"color:black"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Some attempt should be made to put Figure 3 on a =
single page in the
<o:p></o:p></p>
<p class=3D"MsoPlainText">final version. There's one line taken up by &quot=
;&#43;&quot; that is unnecessary<o:p></o:p></p>
<p class=3D"MsoPlainText">in the modified field:<o:p></o:p></p>
<p class=3D"MsoPlainText">GIM<span style=3D"font-family:&quot;Cambria Math&=
quot;,&quot;serif&quot;">=1B$B"d=1B(B</span> That turned to be rather diffi=
cult, considering that the original figure in RFC 5357 is over one page alr=
eady. I've tried to move figure to the very top though.<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; | Sender TTL&nbsp; |&nbsp; S-D=
SCP-ECN&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; &#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt;&gt; &#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; &#43; &lt;&lt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; MBZ (14 octets)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
</div>
</div>
</div>
</body>
</html>

--_000_7347100B5761DC41A166AC17F22DF1122190DC2Ceusaamb103erics_--


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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, "draft-ietf-ippm-type-p-monitor.all@tools.ietf.org" <draft-ietf-ippm-type-p-monitor.all@tools.ietf.org>, "ops-dir@ietf.org" <ops-dir@ietf.org>
Thread-Topic: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02
Thread-Index: AdECqQVnkq7KkOdRTX224qa98WX9ygJoVmHwAAdp1EAAAaV5QA==
Date: Thu, 22 Oct 2015 02:14:46 +0000
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Cc: "ops-ads@tools.ietf.org" <ops-ads@tools.ietf.org>, "ippm@ietf.org" <ippm@ietf.org>
Subject: Re: [ippm] OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02
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Hi Al,
thank you for your help with the XML and proposed clarifications. Below ple=
ase find my proposal to one update you=1B$B!G=1B(Bve suggested under GIM-2>=
> tag.
I=1B$B!G=1B(Bll wait for responses from other reviewers to include their co=
mments.

                Regards,
                                Greg

From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com]
Sent: Wednesday, October 21, 2015 6:35 PM
To: Gregory Mirsky; draft-ietf-ippm-type-p-monitor.all@tools.ietf.org; ops-=
dir@ietf.org
Cc: ops-ads@tools.ietf.org; ippm@ietf.org
Subject: RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02

Hi Greg,

I don=1B$B!G=1B(Bt think you addressed this comment:



The draft header should indicate that this draft updates RFC 5357.


If you need help with the XML formatting to do this,
let me know.

In the draft, the section that moved needs a bit more
editing, IMO:

                   The DSCP value is often copied into reflected test packe=
ts with
                  current TWAMP implementations (with or without TWAMP-Cont=
rol
I would claim this is only
true for the =1B$B!H=1B(Bwithout control=1B$B!I=1B(B case,
so s/with or without/without/
( I must have read this as =1B$B!H=1B(Bwithout=1B$B!I=1B(B
previously, I have knowledge of many
deployed TWAMP nodes.)

                  protocol).  With DSCP and ECN Monitoring Extension, the S=
ession-
                  Reflector handles DSCP as following:

GIM-2>>   The DSCP value is often copied into reflected test packets with
   current TWAMP implementations without TWAMP-Control protocol.


                   o  the Session-Reflector MUST extract the S-DSCP-ECN val=
ue from the
                     DSCP and ECN values of received packets;

                   o  the Session-Reflector MUST transmit each reflected te=
st packet
                     with DSCP set to the negotiated/provisioned value;

                   o  if the negotiated/provisioned DSCP value is not known=
 (e.g.  TWAMP
                     Light), the choice of the DSCP is implementation speci=
fic.  For
                     instance, Session-Reflector MAY copy the DSCP value fr=
om the
                    received test packet and set it as DSCP in a reflected =
packet.

                   o  ECN SHOULD be set to Not-ECT codepoint value [RFC3168=
].

I think this (new) last bullet needs to read:
o  if the negotiated/provisioned ECN value is not known,
   ECN SHOULD be set to Not-ECT codepoint value [RFC3168].
   Otherwise, the provisioned ECN value for the session SHALL be used.
GIM-2>> Yes, agreed.

hope this helps,
Al



From: Gregory Mirsky [mailto:gregory.mirsky@ericsson.com]
Sent: Wednesday, October 21, 2015 6:19 PM
To: MORTON, ALFRED C (AL); draft-ietf-ippm-type-p-monitor.all@tools.ietf.or=
g<mailto:draft-ietf-ippm-type-p-monitor.all@tools.ietf.org>; ops-dir@ietf.o=
rg<mailto:ops-dir@ietf.org>
Cc: ops-ads@tools.ietf.org<mailto:ops-ads@tools.ietf.org>; ippm@ietf.org<ma=
ilto:ippm@ietf.org>
Subject: RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02


Dear Al,

thank you for your thorough review and thoughtful comments. I've prepared t=
he new version to respond to all comments but from Kathleen Moriarty (need =
some extra time).

Would greatly appreciate your review of the changes and hope that these add=
ress your comments.

Please find my answers below in-line and tagged GIM>>.



                Regards,

                                Greg



-----Original Message-----
From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com]
Sent: Monday, October 19, 2015 2:13 PM
To: draft-ietf-ippm-type-p-monitor.all@tools.ietf.org<mailto:draft-ietf-ipp=
m-type-p-monitor.all@tools.ietf.org>; ops-dir@ietf.org<mailto:ops-dir@ietf.=
org>
Cc: ops-ads@tools.ietf.org<mailto:ops-ads@tools.ietf.org>; ippm@ietf.org<ma=
ilto:ippm@ietf.org>
Subject: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02



OPS-DIR, Authors,



I have reviewed this document as part of the Operational directorate's ongo=
ing effort to review all IETF documents being processed by the IESG.

These comments were written primarily for the benefit of the operational ar=
ea directors. Document editors and WG chairs should treat these comments ju=
st like any other last call comments.



Al



Title:

Differentiated Service Code Point and Explicit Congestion Notification

       Monitoring in Two-Way Active Measurement Protocol (TWAMP)

                   draft-ietf-ippm-type-p-monitor-02

https://tools.ietf.org/html/draft-ietf-ippm-type-p-monitor-02



Summary: Almost ready, comments and editorial suggestions follow.



The draft header should indicate that this draft updates RFC 5357.



Section 2.2.1



Figure 1 has a number of canonical references that should

be cited to ensure IPv4 and IPv6 applicability, including

RFC 2474, RFC 3168, and other relevant updates (of which

there are many).



<later>

   o  if the negotiated/provisioned DSCP value is not known (e.g.  TWAMP

      Light), the choice of the DSCP is implementation specific.  For

      instance, Session-Reflector MAY copy the DSCP value from the

      received test packet and set it as DSCP in a reflected packet.

Question:

What about the ECN value?   From 3168:

      +-----+-----+

      | ECN FIELD |

      +-----+-----+

        ECT   CE         [Obsolete] RFC 2481 names for the ECN bits.

         0     0         Not-ECT

         0     1         ECT(1)

         1     0         ECT(0)

         1     1         CE

It makes little sense to copy a "11" =3D=3D CE into the reflected packet,

and it may affect the measured performance if "11" were copied.

The draft needs more guidance here (there is a general problem

when the negotiated values are "not known"; this does not apply

to the Standards Track TWAMP protocol or its extensions).

GIM>> Added

ECN SHOULD be set to Not-ECT codepoint value [RFC3168].

-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-



Editorial comments/suggestions:



OLD

2.2.  TWAMP-Test Extension



   Monitoring of DSCP and ECN requires support by the Session-Reflector

   and changes the format of its test packet format both in

   unauthenticated, authenticated and encrypted modes.

Suggest:

   Monitoring of DSCP and ECN requires support by the Session-Reflector

   and changes the test packet format in all the original

   (unauthenticated, authenticated and encrypted) modes.



GIM=1B$B"d=1B(B Thank you, accepted.

2.2.1



OLD

   o  the first six bits of the Differentiated Service field MUST be

      copied from received Session-Sender test packet into Sender DSCP

      (S-DSCP) field;



   o  the following two bits of the ECN field MUST be copied from

      received Session-Sender test packet into Sender ECN (S-ECN) field.

Suggest:

   o  the six (least-significant) bits of the Differentiated Service field =
MUST be

      copied from received Session-Sender test packet into Sender DSCP

      (S-DSCP) field;



   o  the two bits of the ECN field MUST be copied from

      received Session-Sender test packet into Sender ECN (S-ECN) field.

GIM=1B$B"d=1B(B Thank you. Accepted.



because RFC 3168 defines:

         0     1     2     3     4     5     6     7

      +-----+-----+-----+-----+-----+-----+-----+-----+

      |          DS FIELD, DSCP           | ECN FIELD |

      +-----+-----+-----+-----+-----+-----+-----+-----+



        DSCP: differentiated services codepoint

        ECN:  Explicit Congestion Notification



      Figure 2: The Differentiated Services and ECN Fields in IP.

-=3D-=3D-=3D-=3D-=3D-=3D-=3D-



OLD

    0     1     2     3     4     5     6     7     8

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    |               S-DSCP              |   S-ECN   |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



                Figure 1: Sender DSCP and ECN field format



Suggest:

The extra "+" within bit positions are distracting,

and don't conform to the conventions of these diagrams.

Also, there's no "8" when numbering from 0.

GIM=1B$B"d=1B(B Agree. New version:

      0   1   2   3   4   5   6   7
    +---+---+---+---+---+---+---+---+
    |         S-DSCP        | S-ECN |
    +---+---+---+---+---+---+---+---+

                Figure 1: Sender DSCP and ECN field format





Some attempt should be made to put Figure 3 on a single page in the

final version. There's one line taken up by "+" that is unnecessary

in the modified field:

GIM=1B$B"d=1B(B That turned to be rather difficult, considering that the or=
iginal figure in RFC 5357 is over one page already. I've tried to move figu=
re to the very top though.

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    | Sender TTL  |  S-DSCP-ECN   |                               |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +

    |                                                             |

>> +                                                             + <<

    |                       MBZ (14 octets)                       |

    |                                                             |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+







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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Al,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">thank you for your hel=
p with the XML and proposed clarifications. Below please find my proposal t=
o one update you=1B$B!G=1B(Bve suggested under GIM-2&gt;&gt; tag.<o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I=1B$B!G=1B(Bll wait f=
or responses from other reviewers to include their comments.<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regard=
s,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; Greg<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> MORTON, =
ALFRED C (AL) [mailto:acmorton@att.com]
<br>
<b>Sent:</b> Wednesday, October 21, 2015 6:35 PM<br>
<b>To:</b> Gregory Mirsky; draft-ietf-ippm-type-p-monitor.all@tools.ietf.or=
g; ops-dir@ietf.org<br>
<b>Cc:</b> ops-ads@tools.ietf.org; ippm@ietf.org<br>
<b>Subject:</b> RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">Hi Greg,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">I don=1B$B!G=1B(Bt think you addressed this comment:<o:p></o:p>=
</span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">The draft header should indicate that this draft =
updates RFC 5357.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">If you need help with the XML formatting to do this,<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">let me know.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">In the draft, the section that moved needs a bit more
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">editing, IMO:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The DSCP value is often copie=
d into reflected test packets with&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;current TWAMP implementations (with or w=
ithout TWAMP-Control
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">I would claim this is only
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">true for the =1B$B!H=1B(Bwithout control=1B$B!I=1B(B case,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">so s/with or without/without/<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">( I must have read this as =1B$B!H=1B(Bwithout=1B$B!I=1B(B
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">previously, I have knowledge of many
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">deployed TWAMP nodes.)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;protocol).&nbsp; With DSCP and ECN Monit=
oring Extension, the Session-&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;Reflector handles DSCP as following:&nbs=
p;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"color:#1F497D">GIM-2&gt;&gt;</span=
><span style=3D"font-family:&quot;Courier New&quot;">&nbsp;&nbsp; The DSCP =
value is often copied into reflected test packets with<br>
&nbsp;&nbsp; current TWAMP implementations without TWAMP-Control protocol.&=
nbsp; </span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; the Session-Reflector MUST=
 extract the S-DSCP-ECN value from the&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;DSCP and ECN values of=
 received packets;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; the Session-Reflector MUST=
 transmit each reflected test packet&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;with DSCP set to the n=
egotiated/provisioned value;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; if the negotiated/provisio=
ned DSCP value is not known (e.g.&nbsp; TWAMP
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Light), the choice of =
the DSCP is implementation specific.&nbsp; For&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;instance, Session-Refl=
ector MAY copy the DSCP value from the&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;received test packet and set=
 it as DSCP in a reflected packet.&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;o&nbsp; ECN SHOULD be set to Not-E=
CT codepoint value [RFC3168].&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">I think this (new) last bullet needs to read:<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">o&nbsp; if the negotiated/provisioned ECN value is not known,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp; ECN SHOULD be set to Not-ECT codepoint value [RFC3=
168].<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp; Otherwise, the provisioned ECN value for the sessi=
on SHALL be used.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:#1F497D">GIM-2&gt;&gt; Yes, agreed.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">hope this helps,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black">Al<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;;c=
olor:black"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Gregory =
Mirsky [<a href=3D"mailto:gregory.mirsky@ericsson.com">mailto:gregory.mirsk=
y@ericsson.com</a>]
<br>
<b>Sent:</b> Wednesday, October 21, 2015 6:19 PM<br>
<b>To:</b> MORTON, ALFRED C (AL); <a href=3D"mailto:draft-ietf-ippm-type-p-=
monitor.all@tools.ietf.org">
draft-ietf-ippm-type-p-monitor.all@tools.ietf.org</a>; <a href=3D"mailto:op=
s-dir@ietf.org">
ops-dir@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:ops-ads@tools.ietf.org">ops-ads@tools.ietf.org=
</a>; <a href=3D"mailto:ippm@ietf.org">
ippm@ietf.org</a><br>
<b>Subject:</b> RE: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02<o:p><=
/o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Dear Al,<o:p></o:p></p>
<p class=3D"MsoPlainText">thank you for your thorough review and thoughtful=
 comments. I've prepared the new version to respond to all comments but fro=
m Kathleen Moriarty (need some extra time).<o:p></o:p></p>
<p class=3D"MsoPlainText">Would greatly appreciate your review of the chang=
es and hope that these address your comments.<o:p></o:p></p>
<p class=3D"MsoPlainText">Please find my answers below in-line and tagged G=
IM&gt;&gt;.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regards,<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Greg<o:p></o=
:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">-----Original Message-----<br>
From: MORTON, ALFRED C (AL) [<a href=3D"mailto:acmorton@att.com">mailto:acm=
orton@att.com</a>]
<br>
Sent: Monday, October 19, 2015 2:13 PM<br>
To: <a href=3D"mailto:draft-ietf-ippm-type-p-monitor.all@tools.ietf.org">dr=
aft-ietf-ippm-type-p-monitor.all@tools.ietf.org</a>;
<a href=3D"mailto:ops-dir@ietf.org">ops-dir@ietf.org</a><br>
Cc: <a href=3D"mailto:ops-ads@tools.ietf.org">ops-ads@tools.ietf.org</a>; <=
a href=3D"mailto:ippm@ietf.org">
ippm@ietf.org</a><br>
Subject: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">OPS-DIR, Authors, <o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">I have reviewed this document as part of the Oper=
ational directorate's ongoing effort to review all IETF documents being pro=
cessed by the IESG.&nbsp;
<o:p></o:p></p>
<p class=3D"MsoPlainText">These comments were written primarily for the ben=
efit of the operational area directors. Document editors and WG chairs shou=
ld treat these comments just like any other last call comments.<o:p></o:p><=
/p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Al<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Title:<o:p></o:p></p>
<p class=3D"MsoPlainText">Differentiated Service Code Point and Explicit Co=
ngestion Notification<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Monitoring i=
n Two-Way Active Measurement Protocol (TWAMP)<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; draft-ietf-ippm=
-type-p-monitor-02<o:p></o:p></p>
<p class=3D"MsoPlainText"><a href=3D"https://tools.ietf.org/html/draft-ietf=
-ippm-type-p-monitor-02"><span style=3D"color:windowtext;text-decoration:no=
ne">https://tools.ietf.org/html/draft-ietf-ippm-type-p-monitor-02</span></a=
><o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Summary: Almost ready, comments and editorial sug=
gestions follow.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">The draft header should indicate that this draft =
updates RFC 5357.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Section 2.2.1<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Figure 1 has a number of canonical references tha=
t should
<o:p></o:p></p>
<p class=3D"MsoPlainText">be cited to ensure IPv4 and IPv6 applicability, i=
ncluding
<o:p></o:p></p>
<p class=3D"MsoPlainText">RFC 2474, RFC 3168, and other relevant updates (o=
f which <o:p>
</o:p></p>
<p class=3D"MsoPlainText">there are many).<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&lt;later&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; if the negotiated/provisione=
d DSCP value is not known (e.g.&nbsp; TWAMP<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Light), the choice=
 of the DSCP is implementation specific.&nbsp; For<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; instance, Session-=
Reflector MAY copy the DSCP value from the<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received test pack=
et and set it as DSCP in a reflected packet.<o:p></o:p></p>
<p class=3D"MsoPlainText">Question:<o:p></o:p></p>
<p class=3D"MsoPlainText">What about the ECN value?&nbsp;&nbsp; From 3168:<=
o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;---=
--&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | ECN FIELD |<o:p>=
</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;---=
--&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECT&nb=
sp;&nbsp; CE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [Obsolete] RFC=
 2481 names for the ECN bits.<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
0&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 Not-ECT<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
0&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 ECT(1)<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
1&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 ECT(0)<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
1&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 CE<o:p></o:p></p>
<p class=3D"MsoPlainText">It makes little sense to copy a &quot;11&quot; =
=3D=3D CE into the reflected packet,<o:p></o:p></p>
<p class=3D"MsoPlainText">and it may affect the measured performance if &qu=
ot;11&quot; were copied.<o:p></o:p></p>
<p class=3D"MsoPlainText">The draft needs more guidance here (there is a ge=
neral problem<o:p></o:p></p>
<p class=3D"MsoPlainText">when the negotiated values are &quot;not known&qu=
ot;; this does not apply
<o:p></o:p></p>
<p class=3D"MsoPlainText">to the Standards Track TWAMP protocol or its exte=
nsions).<o:p></o:p></p>
<p class=3D"MsoPlainText">GIM&gt;&gt; Added<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:.5in"><span style=3D"color:b=
lack">ECN SHOULD be set to Not-ECT codepoint value [RFC3168].<o:p></o:p></s=
pan></p>
<p class=3D"MsoPlainText">-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Editorial comments/suggestions:<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">OLD<o:p></o:p></p>
<p class=3D"MsoPlainText">2.2.&nbsp; TWAMP-Test Extension<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; Monitoring of DSCP and ECN requires =
support by the Session-Reflector<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; and changes the format of its test p=
acket format both in<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; unauthenticated, authenticated and e=
ncrypted modes. <o:p>
</o:p></p>
<p class=3D"MsoPlainText">Suggest:<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; Monitoring of DSCP and ECN requires =
support by the Session-Reflector<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; and changes the test packet format i=
n all the original<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; (unauthenticated, authenticated and =
encrypted) modes. <o:p>
</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">GIM</span><span style=
=3D"font-family:&quot;Cambria Math&quot;,&quot;serif&quot;;color:black">=1B=
$B"d=1B(B</span><span style=3D"color:black"> Thank you, accepted.<o:p></o:p=
></span></p>
<p class=3D"MsoPlainText">2.2.1<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">OLD<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; the first six bits of the Di=
fferentiated Service field MUST be<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; copied from receiv=
ed Session-Sender test packet into Sender DSCP<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (S-DSCP) field;<o:=
p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; the following two bits of th=
e ECN field MUST be copied from<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received Session-S=
ender test packet into Sender ECN (S-ECN) field.<o:p></o:p></p>
<p class=3D"MsoPlainText">Suggest:<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; the six (least-significant) =
bits of the Differentiated Service field MUST be<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; copied from receiv=
ed Session-Sender test packet into Sender DSCP<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (S-DSCP) field;<o:=
p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; the two bits of the ECN fiel=
d MUST be copied from<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received Session-S=
ender test packet into Sender ECN (S-ECN) field.<o:p></o:p></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">GIM</span><span style=
=3D"font-family:&quot;Cambria Math&quot;,&quot;serif&quot;;color:black">=1B=
$B"d=1B(B</span><span style=3D"color:black"> Thank you. Accepted.<o:p></o:p=
></span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">because RFC 3168 defines:<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;=
0&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbs=
p; 3&nbsp;&nbsp;&nbsp;&nbsp; 4&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&nbsp;&nbsp;&=
nbsp; 6&nbsp;&nbsp;&nbsp;&nbsp; 7<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;---=
--&#43;-----&#43;-----&#43;-----&#43;-----&#43;-----&#43;-----&#43;<o:p></o=
:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DS FIELD, DSCP&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | ECN FIELD |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;---=
--&#43;-----&#43;-----&#43;-----&#43;-----&#43;-----&#43;-----&#43;<o:p></o=
:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DSCP: =
differentiated services codepoint<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECN:&n=
bsp; Explicit Congestion Notification<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 2: The Diff=
erentiated Services and ECN Fields in IP.<o:p></o:p></p>
<p class=3D"MsoPlainText">-=3D-=3D-=3D-=3D-=3D-=3D-=3D-<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">OLD<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp; 1&nb=
sp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp; 3&nbsp;&nbsp;&nbsp;&nbsp; 4=
&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&nbsp;&nbsp;&nbsp; 6&nbsp;&nbsp;&nbsp;&nbsp=
; 7&nbsp;&nbsp;&nbsp;&nbsp; 8<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S-DSCP&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&n=
bsp; S-ECN&nbsp;&nbsp; |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 1: Sender DSCP and ECN fie=
ld format<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Suggest:<o:p></o:p></p>
<p class=3D"MsoPlainText">The extra &quot;&#43;&quot; within bit positions =
are distracting,<o:p></o:p></p>
<p class=3D"MsoPlainText">and don't conform to the conventions of these dia=
grams.<o:p></o:p></p>
<p class=3D"MsoPlainText">Also, there's no &quot;8&quot; when numbering fro=
m 0.<o:p></o:p></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">GIM</span><span style=
=3D"font-family:&quot;Cambria Math&quot;,&quot;serif&quot;;color:black">=1B=
$B"d=1B(B</span><span style=3D"color:black"> Agree. New version:<o:p></o:p>=
</span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; 1&nbsp;&nbsp; 2&nbsp;&nbsp;=
 3&nbsp;&nbsp; 4&nbsp;&nbsp; 5&nbsp;&nbsp; 6&nbsp;&nbsp; 7<br>
&nbsp;&nbsp;&nbsp; &#43;---&#43;---&#43;---&#43;---&#43;---&#43;---&#43;---=
&#43;---&#43;<br>
&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S-DSCP=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | S-ECN |<br>
&nbsp;&nbsp;&nbsp; &#43;---&#43;---&#43;---&#43;---&#43;---&#43;---&#43;---=
&#43;---&#43;<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; Figure 1: Sender DSCP and ECN field format</span><o:p></o:p=
></p>
<p class=3D"MsoPlainText"><span style=3D"color:black"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Some attempt should be made to put Figure 3 on a =
single page in the
<o:p></o:p></p>
<p class=3D"MsoPlainText">final version. There's one line taken up by &quot=
;&#43;&quot; that is unnecessary<o:p></o:p></p>
<p class=3D"MsoPlainText">in the modified field:<o:p></o:p></p>
<p class=3D"MsoPlainText">GIM<span style=3D"font-family:&quot;Cambria Math&=
quot;,&quot;serif&quot;">=1B$B"d=1B(B</span> That turned to be rather diffi=
cult, considering that the original figure in RFC 5357 is over one page alr=
eady. I've tried to move figure to the very top though.<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; | Sender TTL&nbsp; |&nbsp; S-D=
SCP-ECN&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; &#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt;&gt; &#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; &#43; &lt;&lt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; MBZ (14 octets)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
</div>
</div>
</body>
</html>

--_000_7347100B5761DC41A166AC17F22DF1122190DC4Beusaamb103erics_--


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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: Gregory Mirsky <gregory.mirsky@ericsson.com>, Joachim Fabini <Joachim.Fabini@tuwien.ac.at>, Greg Mirsky <gregimirsky@gmail.com>
Date: Wed, 21 Oct 2015 22:20:11 -0400
Thread-Topic: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, Joachim Fabini <Joachim.Fabini@tuwien.ac.at>, Greg Mirsky <gregimirsky@gmail.com>
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Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: Gregory Mirsky <gregory.mirsky@ericsson.com>, Joachim Fabini <Joachim.Fabini@tuwien.ac.at>, Greg Mirsky <gregimirsky@gmail.com>
Date: Thu, 22 Oct 2015 07:26:07 -0400
Thread-Topic: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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Subject: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Spencer Dawkins has entered the following ballot position for
draft-ietf-ippm-type-p-monitor-02: Yes

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

My apologies for thinking slowly ... but it doesn't look like these
questions will be difficult to resolve.

I talked with David Black about this draft, and he had questions that I
translated into AD-speak as:

Reflecting an unknown DSCP value is a MAY. Can reflecting packets using a
DSCP value you don't understand be a bad idea? How important is that the
DSCP value is NOT 0 (CS0, default forwarding)?

If you are reflecting a DSCP value, are you also reflecting the ECN(0)
bit unchanged?

TWAMP doesn't look congestion-controlled to me (certainly not in the
reflected direction - https://tools.ietf.org/html/rfc5357 says the packet
is reflected as quickly/immediately as possible in at least three places
I can see. What is a typical sending rate for the Session-Sender, and is
that likely to cause problems in the reflected direction?

His note to me follows:

This bullet at the end of 2.2.2 bothers me:
 
   o  if the negotiated/provisioned DSCP value is not known (e.g.  TWAMP
      Light), the choice of the DSCP is implementation specific.  For
      instance, Session-Reflector MAY copy the DSCP value from the
      received test packet and set it as DSCP in a reflected packet
 
This is implicitly recommending reflection of the DSCP value, and by
omitted implication, reflection of the ECN value.  Both of those seem
like bad ideas, it would be better to say that in this case the DSCP
should be set to 0 (CS0, Default forwarding).  I would also say that
the ECN field MUST be set to 0 (not-ECT) in the reflected packet,
always.
 
Iâ€™m a bit concerned about setting ECT(0) or ECT(1) on the forward
measurement path, as TWAMP is not congestion-responsive.  Is the
transmission rate of TWAMP low enough to not cause a problem if CE
signals are received and ignored in the ECN field at the Reflector?



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To: Spencer Dawkins <spencerdawkins.ietf@gmail.com>, The IESG <iesg@ietf.org>
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Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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From: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>
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Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Hi, Al,

On Thu, Oct 22, 2015 at 7:08 AM, MORTON, ALFRED C (AL) <acmorton@att.com>
wrote:

> Hi Spencer and David,
>
> quick reply below,
> A


It was quick, and helpful. Thanks to you and Greg for being on top of this
draft.

Spencer


> > -----Original Message-----
> > From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Spencer Dawkins
> > Sent: Thursday, October 22, 2015 7:45 AM
> > To: The IESG
> > Cc: ippm-chairs@ietf.org; draft-ietf-ippm-type-p-monitor@ietf.org;
> > david.black@emc.com; ippm@ietf.org
> > Subject: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-
> > 02: (with COMMENT)
> >
> > Spencer Dawkins has entered the following ballot position for
> > draft-ietf-ippm-type-p-monitor-02: Yes
> >
> ...
> >
> > ----------------------------------------------------------------------
> > COMMENT:
> > ----------------------------------------------------------------------
> >
> > My apologies for thinking slowly ... but it doesn't look like these
> > questions will be difficult to resolve.
> >
> > I talked with David Black about this draft, and he had questions that I
> > translated into AD-speak as:
> >
> > Reflecting an unknown DSCP value is a MAY. Can reflecting packets using
> > a DSCP value you don't understand be a bad idea? How important is that
> > the DSCP value is NOT 0 (CS0, default forwarding)?
> >
> > If you are reflecting a DSCP value, are you also reflecting the ECN(0)
> > bit unchanged?
> >
> > TWAMP doesn't look congestion-controlled to me (certainly not in the
> > reflected direction - https://tools.ietf.org/html/rfc5357 says the
> > packet is reflected as quickly/immediately as possible in at least thre=
e
> > places I can see. What is a typical sending rate for the Session-Sender=
,
> > and is that likely to cause problems in the reflected direction?
> >
> > His note to me follows:
> >
> > This bullet at the end of 2.2.2 bothers me:
> >
> >    o  if the negotiated/provisioned DSCP value is not known (e.g.  TWAM=
P
> >       Light), the choice of the DSCP is implementation specific.  For
> >       instance, Session-Reflector MAY copy the DSCP value from the
> >       received test packet and set it as DSCP in a reflected packet
> >
> > This is implicitly recommending reflection of the DSCP value, and by
> > omitted implication, reflection of the ECN value.  Both of those seem
> > like bad ideas, it would be better to say that in this case the DSCP
> > should be set to 0 (CS0, Default forwarding).  I would also say that th=
e
> > ECN field MUST be set to 0 (not-ECT) in the reflected packet, always.
> >
> > I=E2=80=99m a bit concerned about setting ECT(0) or ECT(1) on the forwa=
rd
> > measurement path, as TWAMP is not congestion-responsive.  Is the
> > transmission rate of TWAMP low enough to not cause a problem if CE
> > signals are received and ignored in the ECN field at the Reflector?
> >
> [ACM]
> This topic (omission of ECN instructions) was a part of my OPS-Dir review=
.
> Greg and I worked out the following last night (on ippm-list).
> we think this (new) last bullet needs to read:
>
> o  if the negotiated/provisioned ECN value is not known,
>    ECN SHOULD be set to Not-ECT codepoint value [RFC3168].
>    Otherwise, the provisioned ECN value for the session SHALL be used.
> Greg>> Yes, agreed.
>
> We could add more about TWAMP sending rates, or that TWAMP Session-Sender=
s
> and Reflectors need to be ECN-responsive ECT(1) is used.
>
> I could live with saying that the *un-provisioned* DSCP should be set to
> zero
> at the reflector, but we did not discuss that aspect last night.
>
> It would potentially have the effect of testing different classes
> in the forward and reverse directions to set all reflected (reverse path)
> DSCPs to zero (when DSCP and ECN are un-provisioned).
>
> regards,
> Al
>
>
>

--001a1143c0f684cbc90522b07bcc
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi, Al,<div class=3D"gmail_extra"><br><div class=3D"gmail_=
quote">On Thu, Oct 22, 2015 at 7:08 AM, MORTON, ALFRED C (AL) <span dir=3D"=
ltr">&lt;<a href=3D"mailto:acmorton@att.com" target=3D"_blank">acmorton@att=
.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Spencer and=
 David,<br>
<br>
quick reply below,<br>
A</blockquote><div><br></div><div>It was quick, and helpful. Thanks to you =
and Greg for being on top of this draft.</div><div><br></div><div>Spencer</=
div><div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 =
0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class=3D"">&gt; -=
----Original Message-----<br>
&gt; From: ippm [mailto:<a href=3D"mailto:ippm-bounces@ietf.org">ippm-bounc=
es@ietf.org</a>] On Behalf Of Spencer Dawkins<br>
&gt; Sent: Thursday, October 22, 2015 7:45 AM<br>
&gt; To: The IESG<br>
&gt; Cc: <a href=3D"mailto:ippm-chairs@ietf.org">ippm-chairs@ietf.org</a>; =
<a href=3D"mailto:draft-ietf-ippm-type-p-monitor@ietf.org">draft-ietf-ippm-=
type-p-monitor@ietf.org</a>;<br>
&gt; <a href=3D"mailto:david.black@emc.com">david.black@emc.com</a>; <a hre=
f=3D"mailto:ippm@ietf.org">ippm@ietf.org</a><br>
&gt; Subject: [ippm] Spencer Dawkins&#39; Yes on draft-ietf-ippm-type-p-mon=
itor-<br>
&gt; 02: (with COMMENT)<br>
&gt;<br>
&gt; Spencer Dawkins has entered the following ballot position for<br>
&gt; draft-ietf-ippm-type-p-monitor-02: Yes<br>
&gt;<br>
</span>...<br>
<div><div class=3D"h5">&gt;<br>
&gt; ----------------------------------------------------------------------=
<br>
&gt; COMMENT:<br>
&gt; ----------------------------------------------------------------------=
<br>
&gt;<br>
&gt; My apologies for thinking slowly ... but it doesn&#39;t look like thes=
e<br>
&gt; questions will be difficult to resolve.<br>
&gt;<br>
&gt; I talked with David Black about this draft, and he had questions that =
I<br>
&gt; translated into AD-speak as:<br>
&gt;<br>
&gt; Reflecting an unknown DSCP value is a MAY. Can reflecting packets usin=
g<br>
&gt; a DSCP value you don&#39;t understand be a bad idea? How important is =
that<br>
&gt; the DSCP value is NOT 0 (CS0, default forwarding)?<br>
&gt;<br>
&gt; If you are reflecting a DSCP value, are you also reflecting the ECN(0)=
<br>
&gt; bit unchanged?<br>
&gt;<br>
&gt; TWAMP doesn&#39;t look congestion-controlled to me (certainly not in t=
he<br>
&gt; reflected direction - <a href=3D"https://tools.ietf.org/html/rfc5357" =
rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html/rfc5357</a=
> says the<br>
&gt; packet is reflected as quickly/immediately as possible in at least thr=
ee<br>
&gt; places I can see. What is a typical sending rate for the Session-Sende=
r,<br>
&gt; and is that likely to cause problems in the reflected direction?<br>
&gt;<br>
&gt; His note to me follows:<br>
&gt;<br>
&gt; This bullet at the end of 2.2.2 bothers me:<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 o=C2=A0 if the negotiated/provisioned DSCP value is not k=
nown (e.g.=C2=A0 TWAMP<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0Light), the choice of the DSCP is implementa=
tion specific.=C2=A0 For<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0instance, Session-Reflector MAY copy the DSC=
P value from the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0received test packet and set it as DSCP in a=
 reflected packet<br>
&gt;<br>
&gt; This is implicitly recommending reflection of the DSCP value, and by<b=
r>
&gt; omitted implication, reflection of the ECN value.=C2=A0 Both of those =
seem<br>
&gt; like bad ideas, it would be better to say that in this case the DSCP<b=
r>
&gt; should be set to 0 (CS0, Default forwarding).=C2=A0 I would also say t=
hat the<br>
&gt; ECN field MUST be set to 0 (not-ECT) in the reflected packet, always.<=
br>
&gt;<br>
&gt; I=E2=80=99m a bit concerned about setting ECT(0) or ECT(1) on the forw=
ard<br>
&gt; measurement path, as TWAMP is not congestion-responsive.=C2=A0 Is the<=
br>
&gt; transmission rate of TWAMP low enough to not cause a problem if CE<br>
&gt; signals are received and ignored in the ECN field at the Reflector?<br=
>
&gt;<br>
</div></div>[ACM]<br>
This topic (omission of ECN instructions) was a part of my OPS-Dir review.<=
br>
Greg and I worked out the following last night (on ippm-list).<br>
we think this (new) last bullet needs to read:<br>
<br>
o=C2=A0 if the negotiated/provisioned ECN value is not known,<br>
=C2=A0 =C2=A0ECN SHOULD be set to Not-ECT codepoint value [RFC3168].<br>
=C2=A0 =C2=A0Otherwise, the provisioned ECN value for the session SHALL be =
used.<br>
Greg&gt;&gt; Yes, agreed.<br>
<br>
We could add more about TWAMP sending rates, or that TWAMP Session-Senders<=
br>
and Reflectors need to be ECN-responsive ECT(1) is used.<br>
<br>
I could live with saying that the *un-provisioned* DSCP should be set to ze=
ro<br>
at the reflector, but we did not discuss that aspect last night.<br>
<br>
It would potentially have the effect of testing different classes<br>
in the forward and reverse directions to set all reflected (reverse path)<b=
r>
DSCPs to zero (when DSCP and ECN are un-provisioned).<br>
<br>
regards,<br>
Al<br>
<br>
<br>
</blockquote></div><br></div></div>

--001a1143c0f684cbc90522b07bcc--


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From: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
To: "MORTON, ALFRED C (AL)" <acmorton@att.com>
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Subject: Re: [ippm] Kathleen Moriarty's No Objection on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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On Wed, Oct 21, 2015 at 9:48 PM, MORTON, ALFRED C (AL) <acmorton@att.com> wrote:
> Hi Greg,
>
>
>
> I think Kathleen is asking for the Security Considerations Section
>
> to include references to sections in TWAMP where the various
>
> security modes are discussed.
>
>
>
> Sections such as 3.2, 4., 4.1.2, 4.2, and 4.2.1 of RFC 5357 discuss
>
> these modes in varying degrees of detail.

Yes, that's exactly what I was looking to see added.

Thanks!
Kathleen

>
>
>
> Al
>
>
>
> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Gregory Mirsky
> Sent: Wednesday, October 21, 2015 8:26 PM
> To: Kathleen Moriarty; The IESG
> Cc: ippm-chairs@ietf.org; draft-ietf-ippm-type-p-monitor@ietf.org;
> ippm@ietf.org
> Subject: Re: [ippm] Kathleen Moriarty's No Objection on
> draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
>
>
>
> Dear Kathleen,
>
> thank you for your comment. I've found the discussion of the three modes in
> Section 4.2.1. As the discussion was not placed in separate sub-section
> referencing it directly, not the whole section, is a challenge. Would
> greatly appreciate your suggestion. And, as I've been asked question related
> to security, would appreciate your suggestion on how best to relate this
> proposal with another draft from the IPPM WG - IKEv2-derived Shared Secret
> Key for O/TWAMP (draft-ietf-ippm-ipsec-11). Perhaps the following can be
> added into Security Considerations section:
>
> Methods and procedures to use shared key derived from Internet Key Exchange
> Protocol Version 2 [RFC7296] described in [I-D.ietf-ippm-ipsec] apply to
> DSCP and ECN Monitoring extension in full.
>
>
>
>         Regards,
>
>                 Greg
>
>
>
>
>
> -----Original Message-----
> From: Kathleen Moriarty [mailto:Kathleen.Moriarty.ietf@gmail.com]
> Sent: Wednesday, October 21, 2015 8:28 AM
> To: The IESG
> Cc: draft-ietf-ippm-type-p-monitor@ietf.org; ippm-chairs@ietf.org;
> ietf@trammell.ch; ippm@ietf.org
> Subject: Kathleen Moriarty's No Objection on
> draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
>
>
>
> Kathleen Moriarty has entered the following ballot position for
>
> draft-ietf-ippm-type-p-monitor-02: No Objection
>
>
>
> When responding, please keep the subject line intact and reply to all email
> addresses included in the To and CC lines. (Feel free to cut this
> introductory paragraph, however.)
>
>
>
>
>
> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
>
> for more information about IESG DISCUSS and COMMENT positions.
>
>
>
>
>
> The document, along with other ballot positions, can be found here:
>
> https://datatracker.ietf.org/doc/draft-ietf-ippm-type-p-monitor/
>
>
>
>
>
>
>
> ----------------------------------------------------------------------
>
> COMMENT:
>
> ----------------------------------------------------------------------
>
>
>
> Since rfc5357 has more discussion on the differences between
> unauthenticated, authenticated, and encrypted modes, it would be helpful to
> have a pointer to that specific point in the Security Considerations
> section.
>
>
>
>
>
>



-- 

Best regards,
Kathleen


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From: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>
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Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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--001a11438ee8ba1e780522b1264c
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On one specific point ...

On Thu, Oct 22, 2015 at 7:31 AM, Black, David <david.black@emc.com> wrote:

> > o  if the negotiated/provisioned ECN value is not known,
> >    ECN SHOULD be set to Not-ECT codepoint value [RFC3168].
> >    Otherwise, the provisioned ECN value for the session SHALL be used.
> > Greg>> Yes, agreed.
>
> I don't understand what "negotiated/provisioned" means for the ECN value
> because that's usually handled by the protocol (e.g., TCP), so TWAMP
> would have to do this for itself.  This differs from DSCP handling.
>
> > We could add more about TWAMP sending rates,


I observed to David that -00 of the individual draft for TWAMP had roughly
the same "reflect as immediately as possible" behavior in 2005 that we're
discussing now. I'm guessing that this hasn't been recognized as a problem
because of TWAMP sending rates (not that it couldn't be a problem in the
future, of course), but I am guessing.

So, I wouldn't mind hearing more about that, even if it doesn't end up in
the draft.

Thanks,

Spencer


> or that TWAMP Session-Senders
> > and Reflectors need to be ECN-responsive ECT(1) is used.
>
> And "ECN-responsive" would mean what, specifically?  Whatever that is,
> now is probably not a good time to design it, unless it's something rathe=
r
> brute-force (e.g., if CE is seen, stop).  This may need to rely on low
> TWAMP sending rates, and caution that TWAMP can discard CE signals from
> the network.
>
> > I could live with saying that the *un-provisioned* DSCP should be set t=
o
> zero
> > at the reflector, but we did not discuss that aspect last night.
>
> That would be good.  It's probably ok to mention reflecting the DSCP and
> setting it to zero as possibilities - the mention solely of reflection
> of the DSCP comes across as a weak recommendation to do so, whereas
> mentioning multiple possibilities would be more balanced.
>
> > It would potentially have the effect of testing different classes
> > in the forward and reverse directions to set all reflected (reverse pat=
h)
> > DSCPs to zero (when DSCP and ECN are un-provisioned).
>
> Well, ECN is usually only set in one direction, so that testing approach
> for ECN would be realistic.
>
> Thanks,
> --David
>
> > -----Original Message-----
> > From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com]
> > Sent: Thursday, October 22, 2015 8:08 AM
> > To: Spencer Dawkins; The IESG
> > Cc: ippm-chairs@ietf.org; draft-ietf-ippm-type-p-monitor@ietf.org;
> Black,
> > David; ippm@ietf.org
> > Subject: RE: [ippm] Spencer Dawkins' Yes on
> draft-ietf-ippm-type-p-monitor-02:
> > (with COMMENT)
> >
> > Hi Spencer and David,
> >
> > quick reply below,
> > Al
> >
> > > -----Original Message-----
> > > From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Spencer Dawkin=
s
> > > Sent: Thursday, October 22, 2015 7:45 AM
> > > To: The IESG
> > > Cc: ippm-chairs@ietf.org; draft-ietf-ippm-type-p-monitor@ietf.org;
> > > david.black@emc.com; ippm@ietf.org
> > > Subject: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monito=
r-
> > > 02: (with COMMENT)
> > >
> > > Spencer Dawkins has entered the following ballot position for
> > > draft-ietf-ippm-type-p-monitor-02: Yes
> > >
> > ...
> > >
> > > ---------------------------------------------------------------------=
-
> > > COMMENT:
> > > ---------------------------------------------------------------------=
-
> > >
> > > My apologies for thinking slowly ... but it doesn't look like these
> > > questions will be difficult to resolve.
> > >
> > > I talked with David Black about this draft, and he had questions that=
 I
> > > translated into AD-speak as:
> > >
> > > Reflecting an unknown DSCP value is a MAY. Can reflecting packets usi=
ng
> > > a DSCP value you don't understand be a bad idea? How important is tha=
t
> > > the DSCP value is NOT 0 (CS0, default forwarding)?
> > >
> > > If you are reflecting a DSCP value, are you also reflecting the ECN(0=
)
> > > bit unchanged?
> > >
> > > TWAMP doesn't look congestion-controlled to me (certainly not in the
> > > reflected direction - https://tools.ietf.org/html/rfc5357 says the
> > > packet is reflected as quickly/immediately as possible in at least
> three
> > > places I can see. What is a typical sending rate for the
> Session-Sender,
> > > and is that likely to cause problems in the reflected direction?
> > >
> > > His note to me follows:
> > >
> > > This bullet at the end of 2.2.2 bothers me:
> > >
> > >    o  if the negotiated/provisioned DSCP value is not known (e.g.
> TWAMP
> > >       Light), the choice of the DSCP is implementation specific.  For
> > >       instance, Session-Reflector MAY copy the DSCP value from the
> > >       received test packet and set it as DSCP in a reflected packet
> > >
> > > This is implicitly recommending reflection of the DSCP value, and by
> > > omitted implication, reflection of the ECN value.  Both of those seem
> > > like bad ideas, it would be better to say that in this case the DSCP
> > > should be set to 0 (CS0, Default forwarding).  I would also say that
> the
> > > ECN field MUST be set to 0 (not-ECT) in the reflected packet, always.
> > >
> > > I=E2=80=99m a bit concerned about setting ECT(0) or ECT(1) on the for=
ward
> > > measurement path, as TWAMP is not congestion-responsive.  Is the
> > > transmission rate of TWAMP low enough to not cause a problem if CE
> > > signals are received and ignored in the ECN field at the Reflector?
> > >
> > [ACM]
> > This topic (omission of ECN instructions) was a part of my OPS-Dir
> review.
> > Greg and I worked out the following last night (on ippm-list).
> > we think this (new) last bullet needs to read:
> >
> > o  if the negotiated/provisioned ECN value is not known,
> >    ECN SHOULD be set to Not-ECT codepoint value [RFC3168].
> >    Otherwise, the provisioned ECN value for the session SHALL be used.
> > Greg>> Yes, agreed.
> >
> > We could add more about TWAMP sending rates, or that TWAMP
> Session-Senders
> > and Reflectors need to be ECN-responsive ECT(1) is used.
> >
> > I could live with saying that the *un-provisioned* DSCP should be set t=
o
> zero
> > at the reflector, but we did not discuss that aspect last night.
> >
> > It would potentially have the effect of testing different classes
> > in the forward and reverse directions to set all reflected (reverse pat=
h)
> > DSCPs to zero (when DSCP and ECN are un-provisioned).
> >
> > regards,
> > Al
> >
>
>

--001a11438ee8ba1e780522b1264c
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">On one specific point ...<div class=3D"gmail_extra"><br><d=
iv class=3D"gmail_quote">On Thu, Oct 22, 2015 at 7:31 AM, Black, David <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:david.black@emc.com" target=3D"_blank">=
david.black@emc.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
><span class=3D"">&gt; o=C2=A0 if the negotiated/provisioned ECN value is n=
ot known,<br>
&gt;=C2=A0 =C2=A0 ECN SHOULD be set to Not-ECT codepoint value [RFC3168].<b=
r>
&gt;=C2=A0 =C2=A0 Otherwise, the provisioned ECN value for the session SHAL=
L be used.<br>
&gt; Greg&gt;&gt; Yes, agreed.<br>
<br>
</span>I don&#39;t understand what &quot;negotiated/provisioned&quot; means=
 for the ECN value<br>
because that&#39;s usually handled by the protocol (e.g., TCP), so TWAMP<br=
>
would have to do this for itself.=C2=A0 This differs from DSCP handling.<br=
>
<span class=3D""><br>
&gt; We could add more about TWAMP sending rates, </span></blockquote><div>=
<br></div><div>I observed to David that -00 of the individual draft for TWA=
MP had roughly the same &quot;reflect as immediately as possible&quot; beha=
vior in 2005 that we&#39;re discussing now. I&#39;m guessing that this hasn=
&#39;t been recognized as a problem because of TWAMP sending rates (not tha=
t it couldn&#39;t be a problem in the future, of course), but I am guessing=
.</div><div><br></div><div>So, I wouldn&#39;t mind hearing more about that,=
 even if it doesn&#39;t end up in the draft.</div><div><br></div><div>Thank=
s,</div><div><br></div><div>Spencer</div><div>=C2=A0</div><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex"><span class=3D"">or that TWAMP Session-Senders<br>
&gt; and Reflectors need to be ECN-responsive ECT(1) is used.<br>
<br>
</span>And &quot;ECN-responsive&quot; would mean what, specifically?=C2=A0 =
Whatever that is,<br>
now is probably not a good time to design it, unless it&#39;s something rat=
her<br>
brute-force (e.g., if CE is seen, stop).=C2=A0 This may need to rely on low=
<br>
TWAMP sending rates, and caution that TWAMP can discard CE signals from<br>
the network.<br>
<span class=3D""><br>
&gt; I could live with saying that the *un-provisioned* DSCP should be set =
to zero<br>
&gt; at the reflector, but we did not discuss that aspect last night.<br>
<br>
</span>That would be good.=C2=A0 It&#39;s probably ok to mention reflecting=
 the DSCP and<br>
setting it to zero as possibilities - the mention solely of reflection<br>
of the DSCP comes across as a weak recommendation to do so, whereas<br>
mentioning multiple possibilities would be more balanced.<br>
<span class=3D""><br>
&gt; It would potentially have the effect of testing different classes<br>
&gt; in the forward and reverse directions to set all reflected (reverse pa=
th)<br>
&gt; DSCPs to zero (when DSCP and ECN are un-provisioned).<br>
<br>
</span>Well, ECN is usually only set in one direction, so that testing appr=
oach<br>
for ECN would be realistic.<br>
<br>
Thanks,<br>
--David<br>
<div class=3D"HOEnZb"><div class=3D"h5"><br>
&gt; -----Original Message-----<br>
&gt; From: MORTON, ALFRED C (AL) [mailto:<a href=3D"mailto:acmorton@att.com=
">acmorton@att.com</a>]<br>
&gt; Sent: Thursday, October 22, 2015 8:08 AM<br>
&gt; To: Spencer Dawkins; The IESG<br>
&gt; Cc: <a href=3D"mailto:ippm-chairs@ietf.org">ippm-chairs@ietf.org</a>; =
<a href=3D"mailto:draft-ietf-ippm-type-p-monitor@ietf.org">draft-ietf-ippm-=
type-p-monitor@ietf.org</a>; Black,<br>
&gt; David; <a href=3D"mailto:ippm@ietf.org">ippm@ietf.org</a><br>
&gt; Subject: RE: [ippm] Spencer Dawkins&#39; Yes on draft-ietf-ippm-type-p=
-monitor-02:<br>
&gt; (with COMMENT)<br>
&gt;<br>
&gt; Hi Spencer and David,<br>
&gt;<br>
&gt; quick reply below,<br>
&gt; Al<br>
&gt;<br>
&gt; &gt; -----Original Message-----<br>
&gt; &gt; From: ippm [mailto:<a href=3D"mailto:ippm-bounces@ietf.org">ippm-=
bounces@ietf.org</a>] On Behalf Of Spencer Dawkins<br>
&gt; &gt; Sent: Thursday, October 22, 2015 7:45 AM<br>
&gt; &gt; To: The IESG<br>
&gt; &gt; Cc: <a href=3D"mailto:ippm-chairs@ietf.org">ippm-chairs@ietf.org<=
/a>; <a href=3D"mailto:draft-ietf-ippm-type-p-monitor@ietf.org">draft-ietf-=
ippm-type-p-monitor@ietf.org</a>;<br>
&gt; &gt; <a href=3D"mailto:david.black@emc.com">david.black@emc.com</a>; <=
a href=3D"mailto:ippm@ietf.org">ippm@ietf.org</a><br>
&gt; &gt; Subject: [ippm] Spencer Dawkins&#39; Yes on draft-ietf-ippm-type-=
p-monitor-<br>
&gt; &gt; 02: (with COMMENT)<br>
&gt; &gt;<br>
&gt; &gt; Spencer Dawkins has entered the following ballot position for<br>
&gt; &gt; draft-ietf-ippm-type-p-monitor-02: Yes<br>
&gt; &gt;<br>
&gt; ...<br>
&gt; &gt;<br>
&gt; &gt; -----------------------------------------------------------------=
-----<br>
&gt; &gt; COMMENT:<br>
&gt; &gt; -----------------------------------------------------------------=
-----<br>
&gt; &gt;<br>
&gt; &gt; My apologies for thinking slowly ... but it doesn&#39;t look like=
 these<br>
&gt; &gt; questions will be difficult to resolve.<br>
&gt; &gt;<br>
&gt; &gt; I talked with David Black about this draft, and he had questions =
that I<br>
&gt; &gt; translated into AD-speak as:<br>
&gt; &gt;<br>
&gt; &gt; Reflecting an unknown DSCP value is a MAY. Can reflecting packets=
 using<br>
&gt; &gt; a DSCP value you don&#39;t understand be a bad idea? How importan=
t is that<br>
&gt; &gt; the DSCP value is NOT 0 (CS0, default forwarding)?<br>
&gt; &gt;<br>
&gt; &gt; If you are reflecting a DSCP value, are you also reflecting the E=
CN(0)<br>
&gt; &gt; bit unchanged?<br>
&gt; &gt;<br>
&gt; &gt; TWAMP doesn&#39;t look congestion-controlled to me (certainly not=
 in the<br>
&gt; &gt; reflected direction - <a href=3D"https://tools.ietf.org/html/rfc5=
357" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html/rfc53=
57</a> says the<br>
&gt; &gt; packet is reflected as quickly/immediately as possible in at leas=
t three<br>
&gt; &gt; places I can see. What is a typical sending rate for the Session-=
Sender,<br>
&gt; &gt; and is that likely to cause problems in the reflected direction?<=
br>
&gt; &gt;<br>
&gt; &gt; His note to me follows:<br>
&gt; &gt;<br>
&gt; &gt; This bullet at the end of 2.2.2 bothers me:<br>
&gt; &gt;<br>
&gt; &gt;=C2=A0 =C2=A0 o=C2=A0 if the negotiated/provisioned DSCP value is =
not known (e.g.=C2=A0 TWAMP<br>
&gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0Light), the choice of the DSCP is imple=
mentation specific.=C2=A0 For<br>
&gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0instance, Session-Reflector MAY copy th=
e DSCP value from the<br>
&gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0received test packet and set it as DSCP=
 in a reflected packet<br>
&gt; &gt;<br>
&gt; &gt; This is implicitly recommending reflection of the DSCP value, and=
 by<br>
&gt; &gt; omitted implication, reflection of the ECN value.=C2=A0 Both of t=
hose seem<br>
&gt; &gt; like bad ideas, it would be better to say that in this case the D=
SCP<br>
&gt; &gt; should be set to 0 (CS0, Default forwarding).=C2=A0 I would also =
say that the<br>
&gt; &gt; ECN field MUST be set to 0 (not-ECT) in the reflected packet, alw=
ays.<br>
&gt; &gt;<br>
&gt; &gt; I=E2=80=99m a bit concerned about setting ECT(0) or ECT(1) on the=
 forward<br>
&gt; &gt; measurement path, as TWAMP is not congestion-responsive.=C2=A0 Is=
 the<br>
&gt; &gt; transmission rate of TWAMP low enough to not cause a problem if C=
E<br>
&gt; &gt; signals are received and ignored in the ECN field at the Reflecto=
r?<br>
&gt; &gt;<br>
&gt; [ACM]<br>
&gt; This topic (omission of ECN instructions) was a part of my OPS-Dir rev=
iew.<br>
&gt; Greg and I worked out the following last night (on ippm-list).<br>
&gt; we think this (new) last bullet needs to read:<br>
&gt;<br>
&gt; o=C2=A0 if the negotiated/provisioned ECN value is not known,<br>
&gt;=C2=A0 =C2=A0 ECN SHOULD be set to Not-ECT codepoint value [RFC3168].<b=
r>
&gt;=C2=A0 =C2=A0 Otherwise, the provisioned ECN value for the session SHAL=
L be used.<br>
&gt; Greg&gt;&gt; Yes, agreed.<br>
&gt;<br>
&gt; We could add more about TWAMP sending rates, or that TWAMP Session-Sen=
ders<br>
&gt; and Reflectors need to be ECN-responsive ECT(1) is used.<br>
&gt;<br>
&gt; I could live with saying that the *un-provisioned* DSCP should be set =
to zero<br>
&gt; at the reflector, but we did not discuss that aspect last night.<br>
&gt;<br>
&gt; It would potentially have the effect of testing different classes<br>
&gt; in the forward and reverse directions to set all reflected (reverse pa=
th)<br>
&gt; DSCPs to zero (when DSCP and ECN are un-provisioned).<br>
&gt;<br>
&gt; regards,<br>
&gt; Al<br>
&gt;<br>
<br>
</div></div></blockquote></div><br></div></div>

--001a11438ee8ba1e780522b1264c--


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To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, Gregory Mirsky <gregory.mirsky@ericsson.com>, Greg Mirsky <gregimirsky@gmail.com>
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From: Joachim Fabini <Joachim.Fabini@tuwien.ac.at>
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Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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Hi Al,

excellent analysis and wording (as always, thanks :). I also support
Greg's proposal (when using "mark" and "marking" this would narrow the
scope - modifying is more general). Overall I'm perfectly fine with
these changes.

What's still open is Mike's comment. I'll reply to his email separately,
perhaps this one triggers yet another fine-tuning of the wording. In
particular the term "intermediate nodes" might be confusing and some
minor changes can help here.

thanks,
Joachim


On 22.10.2015 13:26, MORTON, ALFRED C (AL) wrote:
> Sure Greg.  Joachim, any comment?
> 
>> -----Original Message-----
>> From: Gregory Mirsky [mailto:gregory.mirsky@ericsson.com]
>> Sent: Wednesday, October 21, 2015 10:28 PM
>> To: MORTON, ALFRED C (AL); Joachim Fabini; Greg Mirsky
>> Cc: ippm@ietf.org
>> Subject: RE: [ippm] WGLC on draft-ietf-ippm-active-passive-01
>>
>> Hi Al,
>> may I propose minor update to the proposed text:
>> s/with and without the marking/with and without any type of
>> modification/
>>
>>       Regards,
>>               Greg
>>
>> -----Original Message-----
>> From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com]
>> Sent: Wednesday, October 21, 2015 7:20 PM
>> To: Gregory Mirsky; Joachim Fabini; Greg Mirsky
>> Cc: ippm@ietf.org
>> Subject: RE: [ippm] WGLC on draft-ietf-ippm-active-passive-01
>>
>> Hi Joachim, Greg, and all,
>>
>> The definitions and A-H-P categorization we've constructed (and applied
>> unambiguously to many different example methods now) are dependent on
>> aspects of the methods alone, and independent of the networks to be
>> tested or how those networks treat packets.
>> In the Cap-I Internet we cannot make many assertions about packet
>> treatment, and the Internet is the focus of IPPM's charter (first
>> sentence).
>>
>> So, I believe this is a defendable statement:
>>
>> Ref from 2330:
>> "A closely related note: it would be very useful to know if a given
>> Internet component treats equally a class C of different types of
>> packets. If so, then any one of those types of packets can be used for
>> subsequent measurement of the component.
>> This suggests we devise a metric or suite of metrics that attempt to
>> determine C."
>>
>> Referencing this definition:
>> Hybrid methods of measurement that mark packets of a class C in
>> intermediate nodes should produce equivalent results to passive methods
>> of measurement, when all hosts accessing these packets along the path
>> (between and including sender and receiver) treat packets from both
>> categories of methods (with and without the marking) as the same class
>> C. The passive methods of measurement represent the Ground Truth for
>> comparisons of results between passive and hybrid methods, and this
>> comparison should be conducted to confirm the class C treatment.
>>
>> Hope this works for everyone,
>> Al
>>
>>> -----Original Message-----
>>> From: Gregory Mirsky [mailto:gregory.mirsky@ericsson.com]
>>> Sent: Wednesday, October 21, 2015 1:37 PM
>>> To: Joachim Fabini; MORTON, ALFRED C (AL); Greg Mirsky
>>> Cc: ippm@ietf.org
>>> Subject: RE: [ippm] WGLC on draft-ietf-ippm-active-passive-01
>>>
>>> Hi Joachim,
>>> what a great analysis! I think that you have made definition of Hybrid
>>> measurement methods clear and unambiguous. The foresight of that
>>> paragraph from RFC 2330 is unbelievable as of Back to the Future (the
>>> Future IS today!). I agree and support your proposal to use it in
>>> definition of the Hybrid measurement methods. Frankly, I couldn't get
>>> my head around of a method that is passive and active at the same
>>> time. But I can see that a method may be active or passive in its
>>> instantiations as a measurement task depending on its effect on the
>>> measured flow and the network.
>>>
>>>       Regards,
>>>               Greg
>>>
>>> -----Original Message-----
>>> From: Joachim Fabini [mailto:Joachim.Fabini@tuwien.ac.at]
>>> Sent: Wednesday, October 21, 2015 12:20 AM
>>> To: Gregory Mirsky; MORTON, ALFRED C (AL); Greg Mirsky
>>> Cc: ippm@ietf.org
>>> Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
>>>
>>> Hi Greg, all,
>>>
>>> it's an interesting aspect that you raise. There are several
>>> perspectives to approach this issue - but I see all of them ending up
>>> in categorizing value changes as hybrid. Below my reasoning:
>>>
>>> One key observation is that networks do no longer behave like
>>> stateless copper wires as we used to abstract them. Many networks and
>>> components store internal state and per-session or per-flow
>> information.
>>> There is no way and no rule to predict the consequences of changing a
>>> single bit in packet payload or packet headers along an unknown path.
>>>
>>> Whenever an intermediate node _adds_a_new_ field (e.g., PDM) to an
>>> observed packet, this changes the way the network treats the packet
>>> according to our traditional copper wire abstraction (packetDelay =
>>> defaultDelay + packetSize/linkCapacity). So there is no doubt that
>>> this is a hybrid case, right?
>>>
>>> But there is no way to infer the consequence of marking packets (i.e.,
>>> changing values of header fields beyond the basics required for IPv4
>>> routing, meaning TTL and Checksum for IPv4) in the general case.
>>> My position is that this draft _must_ tackle the _most_general_ worst
>>> case. That is, value changes (potentially) modify the way an unknown
>>> path treats these packets.
>>> I agree that in particular scenarios (white-box measurements) the path
>>> and behavior of all of its links and systems might be known. In such a
>>> case I see, indeed, an overlapping of hybrid and passive - in the
>>> sense that the method is hybrid _and_ might be categorized as passive,
>>> too, when the white-box analysis indicates that marking (in terms of
>>> value
>>> changes) has no impact on the way the network treats the packets.
>>>
>>> Still, my absolute preference is to address the most general case.
>>> Which means, that any packet modification by _measurement_ processes_
>>> in intermediate nodes - this includes both, a) addition/deletion of
>>> fields or b) modification of _values_, labels this measurement method
>>> to belong to the hybrid category.
>>>
>>> Another argument: Assume that there are several, overlapping
>>> measurements of packets ongoing along the same path. Some of them (a)
>>> strictly passive, observing, some of them (b) hybrid. The passive
>>> measurement (a) relies on specific packet checksums or hashes to
>>> identify a packet in subsequent intermediate nodes and has no
>>> knowledge of (b). Now assume that the hybrid measurement process (b)
>>> marks some packets (changes values, adds fields). This will
>>> potentially screw up (a)'s ability to identify packets.
>>>
>>> But let's put this into the context of the theoretical IPPM framework:
>>> changing packet header values in intermediate nodes modifies the
>>> Type-P of the packet. Your measurement process might use a superset of
>>> Type-P (that ignores the marking) to categorize packets, other
>>> components might use subsets (that do _not_ ignore the marking). In
>>> the general case and for black-box paths, a measurement process can
>>> not predict the consequences of markings in intermediate nodes onto
>>> the Type-P treatment of all potential links and components along the
>> path.
>>>
>>> Just recently I found a surprisingly future-proof paragraph in RFC
>>> 2330 (RFC 2330, page 30, second paragraph):
>>>
>>> "A closely related note: it would be very useful to know if a given
>>> Internet component treats equally a class C of different types of
>>> packets. If so, then any one of those types of packets can be used for
>>> subsequent measurement of the component. This suggests we devise a
>>> metric or suite of metrics that attempt to determine C."
>>>
>>> Referencing this definition, one possible compromise could be the
>>> following observation (with explicit reference to the paragraph
>> above):
>>> "hybrid measurements that mark packets of a class C in intermediate
>>> nodes may be categorized as passive, too, when all parties accessing
>>> these packets along the path (in between and including sender and
>>> receiver) categorize both types of packets, before the marking and
>>> afterwards, into the same class C".
>>>
>>> Summarizing, my position is that whenever a measurement process
>>> changes packet header values in intermediate nodes this categorizes
>>> the process as hybrid.
>>>
>>> Joachim
>>>
>>>
>>> On 21.10.2015 06:28, Gregory Mirsky wrote:
>>>> Hi Al,
>>>>
>>>> thank you for sharing you view. Perhaps I used â€œnormal behaviorâ€
>>>> somewhat too often and without clearly linking it to treatment,
>>>> processing on a packet to which the measurement method in question
>>>> directly applied. As Mike and I discussed PDM, weâ€™ve looked at the
>>>> cases when the Optional header is already part of the packet and
>>>> when the header must be added in order to support the PDM. In the
>>>> first case I donâ€™t see that PDM alters processing on the packet by
>>>> the network while in the second thereâ€™s clear impact as the packet
>>>> size
>>> must be increased.
>>>>
>>>> Hope this example explains the context in which Iâ€™ve used â€œnormal
>>>> network behaviorâ€.
>>>>
>>>>
>>>>
>>>>                 Regards,
>>>>
>>>>                                 Greg
>>>>
>>>>
>>>>
>>>> *From:*ippm [mailto:ippm-bounces@ietf.org] *On Behalf Of *MORTON,
>>>> ALFRED C (AL)
>>>> *Sent:* Tuesday, October 20, 2015 7:36 PM
>>>> *To:* Greg Mirsky; Joachim Fabini
>>>> *Cc:* ippm@ietf.org
>>>> *Subject:* Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
>>>>
>>>>
>>>>
>>>> Hi Greg,
>>>>
>>>>
>>>>
>>>> I donâ€™t see a clear way to include impact on normal network behavior
>>>>
>>>> in a definition, because:
>>>>
>>>>
>>>>
>>>> - the network behavior may be unknown.
>>>>
>>>> - the network behavior may change.
>>>>
>>>> - the network may react to any/every new packet.
>>>>
>>>> - the network can react to any packet feature that is in clear view.
>>>>
>>>>
>>>>
>>>> We have discussed that some methods intend to have small impact,
>>>>
>>>> but we can never be certain that they will achieve this goal.
>>>>
>>>>
>>>>
>>>> Al
>>>>
>>>>
>>>>
>>>> *From:*ippm [mailto:ippm-bounces@ietf.org] *On Behalf Of *Greg
>>>> Mirsky
>>>> *Sent:* Tuesday, October 20, 2015 6:12 PM
>>>> *To:* Joachim Fabini
>>>> *Cc:* ippm@ietf.org <mailto:ippm@ietf.org>
>>>> *Subject:* Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
>>>>
>>>>
>>>>
>>>> Hi Joachim, et. al,
>>>>
>>>> I believe that characterization of a measurement method as active,
>>>> passive or hybrid must be based on its impact on the otherwise
>>>> normal network behavior. If the method alters the network behavior
>>>> or treatment of the data, then it is active measurement method. If
>>>> the method does not change network behavior in any aspect, then it
>>>> is passive. Why I believe that is important? Because from this
>>>> point, marking method that does not affect treatment of the flow by
>>>> the network is passive, not active measurement method since marked
>>>> and unmarked packets are indistinguishable to the network except for
>>>> observer(s). But it the marking method applied in the manner that
>>>> would change how marked packets being processed comparing to
>>>> unmarked,
>>> then it is active method.
>>>>
>>>>
>>>>
>>>> Regards,
>>>>
>>>> Greg
>>>>
>>>>
>>>>
>>>> On Tue, Oct 13, 2015 at 3:10 AM, Joachim Fabini
>>>> <Joachim.Fabini@tuwien.ac.at <mailto:Joachim.Fabini@tuwien.ac.at>>
>>> wrote:
>>>>
>>>> Hi Brian, Al, IPPM,
>>>>
>>>> I've read it and it's good... ;) The active-passive-hybrid
>>>> definition and categorization helps enormously and should have been
>>>> started years ago - many thanks to Al for taking the initiative. I
>>>> consider this work to be relevant also for the scientific community.
>>>> In particular the term hybrid is used with many diverging meanings
>>>> (commonly as a buzzword when applying for new project funding), so I
>>>> spent some time on reviewing and reasoning about. Disclaimer: I've
>>>> not been involved into earlier discussions on this draft and it's
>>>> the first time I read it. Consider it to be an unbiased first-time-
>> reader opinion.
>>>>
>>>> Comments (sequential reading, _no_ priority ordering):
>>>>
>>>> Sec. 3.4 (1) s/"a packet stream..."/"Additional packet streams..."/
>>>> to be more generic? Any stream can be an aggregate of other streams,
>>>> but the second variant seems to be more accurate and flexible
>>>> (thinking of several streams with distinct sources and destinations
>>>> for impairing distinct sub-paths of the measurement path).
>>>>
>>>> Sec. 3.4 (2) "The packets in the stream(s) of interest have fields
>>>> (or are augmented or modified to include fields) which are dedicated
>>>> to measurements"
>>>> Proposed (relaxing) addition: Instead of dedicated measurement
>>>> fields an aggregated set of packet header _values_ can be sufficient
>>>> to identify packets as being part of the active measurement stream.
>>>> Considering the hypothetical case of UDP BTC measurements, the
>>>> traffic is actively generated, so the method is active. But packets
>>>> are not marked, nor are there any specific fields like sequence
>>>> numbers that can be used to identify packets. And for a UDP BTC
>>>> metric there is no need for such. One could argue that packets of a
>>>> UDP measurement stream can be identified by SRC/DST IP addresses and
>>>> port numbers, which is why these fields are dedicated to measurement
>>>> - but that's
>>> not intuitive.
>>>> Alternatively the two occurrences of "fields" could be replaced by
>>>> "fields or field values". The key is that these specific measurement
>>>> stream packets are selected/evaluated/measured in at least one
>>>> measurement location. Possibly nitpicking?
>>>>
>>>> Sec. 3.4 (3) possible typo (known a' priori)
>>>>
>>>> Sec. 3.4: not sure: does it make sense to mention in a note possible
>>>> changes of packet type (Type-P) along the measurement path (e.g.
>>>> IPv4->IPv6, tunneling, addition of headers) and possible resulting
>>>> measurement issues? We address this issue in the IPv6 draft but my
>>>> feeling is that it can help to raise reader's awareness in this
>>>> draft, too. Type-P at the source does not necessarily mean same
>>>> Type-P at the destination (same observation is valid for passively
>>>> observing intermediate nodes)
>>>>
>>>> Sec. 3.6: What about Passive Measurements and generating background
>>>> load? Consider the case of passive monitoring of a cellular link
>>>> that does on-demand capacity allocation. The measurement process
>>>> observes the measurement stream at ingress and egress. One might be
>>>> tempted to generated some background load that triggers allocation
>>>> of additional capacity on the link. Where does this method fit into:
>>>> passive or hybrid? I'm not sure. As a matter of consistency with the
>>>> section on active methods (where you mention background load traffic
>>>> explicitly) it might be appropriate to discuss this special case for
>>>> passive
>>> methods, too.
>>>>
>>>> Sec. 3.7: Last paragraph (sentence) is very long and difficult to
>>>> understand, including possible typos. Should "basis of reference
>>>> events as packet pass reference point" read "basis of reference
>>>> events that are generated as packet_s_ pass reference points"?
>>>> Rephrasing can
>>> help here.
>>>>
>>>> Sec. 3.8: The differentiation between hybride-active-passive is not
>>>> clear to me from the definition in 3.8. I believe that the
>>>> definition of "hybrid" {sh|c}ould be sharpened to delimit "hybrid"
>>>> more accurately from active and passive.
>>>>
>>>> One particular case of hybrid measurement - imho the most compelling
>>>> one
>>>> - is the one where passive measurements are combined with additions
>>>> of fields or changes of field values in intermediate
>>>> (observation/measurement) nodes. This includes all kinds of packet
>>>> markings, addition of header fields or changes in header field
>>>> values in intermediate nodes. However, to make the measurement
>>>> hybrid, these changes must be a _consequence_ or _result_ of actions
>>>> undertaken by the (otherwise passive) _measurement_ process.
>>>> My personal opinion on this:
>>>> a) Active: whenever the measurement process generates a dedicated
>>>> stream of measurement packets, where packets are identifiable either
>>>> by dedicated measurement fields (either in payload or header),
>>>> and/or by (possibly aggregated, i.e., set of) field values, the
>>>> method/metric can be categorized as active
>>>> b) Passive: whenever the measurement process observes an existing
>>>> stream of packets without changing/adding/removing any packet fields
>>>> or field values. The passive monitoring _must_not_ add/change/remove
>>>> header fields or header field values. Although passive monitoring
>>>> might bias the timing of the observed traffic to some extent (be it
>>>> by setting interfaces into promiscous mode or by inserting splitters
>>>> into the path) it does not do this _intentionally_. Open question:
>>>> into which category does the generation of background load for
>>>> passive
>>> measurements fit?
>>>> c) Hybrid: the measurement acts exclusively on existing traffic,
>>>> that is, anything that is categorized as passive (b). However, the
>>>> _measurement_ process adds/changes/removes fields or changes packet
>>>> field values in (intermediate) nodes as part of the measurement (may
>>>> be header or payload). Obviously, IPv4 header updates that result
>>>> from forwarding rules (checksum, TTL) are NOT part of the
>>>> measurement process. Question: does "passive + background load" fit
>> into hybrid?
>>>>
>>>> Sec. 3.8: Possible Typo: Y.1540 define_s_ -> _d_?
>>>>
>>>> Sec. 4: 1. Possible typo "effects" -> "biases"?
>>>>
>>>> Sec. 4: "To keep simple, we consider the stream effect only when it
>>>> is present".
>>>> This statement imho conflicts with the main findings of RFC7312.
>>>> Today's networks store flow/stream state at layers below IP, so
>>>> networks have a "historic view". I doubt that this bias can be
>>>> ignored
>>>> - infact the bias of past periods is visible during the current
>>>> measurement period. A mention of possible consequences in stateful
>>>> networks with reference to
>>>> 7312 could be a cheap solution (not sure if this is sufficient).
>>>>
>>>> Sec. 4: ASCII diagram: it might improve readability to add axis
>>>> labels (don't know how this can be done easily, maybe split/break
>>>> descriptions of reference points onto several lines): y axis label:
>>>> "Measurement stream capacity", x axis label: "Stream characteristics
>>> known".
>>>> In this context its's also not clear to me whether stream
>>>> characteristics must be just "known" or if they must be
>>>> controled/generated/changed.
>>>>
>>>> Sec. 4, 4.1, 4.2: Page 7: The examples (and detailed reasoning) are
>>>> excellent here to support and illustrate the categories defined
>>> before.
>>>> Still, I believe that an earlier clear categorization
>>>> active/passive/hybrid in sec. 3.8 can ease the reading.
>>>>
>>>> Sec. 4.1., 4.2: I fully agree with the categorization. However, is
>>>> the "small effect" essential for these examples/statement? One could
>>>> find several cases when the bias onto measurements is substantial -
>>>> anything between a) "packets become too large when adding the PDM
>>>> header and results in <IPv6-fragementation-required> to the sending
>>>> host", b) "Size increase with PDM header makes stream to exceed a
>>>> network threshold and trigger channel capacity re-allocation" and c)
>>>> "subsequent nodes on the path drop these packets because of the
>>> measurement node modifications".
>>>> All of these actions should result in substantial bias of
>>>> measurement results. And even the change of field values could
>>>> result in intermediate nodes to apply distinct forwarding policies
>>>> to the
>>> packets.
>>>>
>>>> The point is that the measurement process _intends_ to introduce a
>>>> minimum bias but it's quite difficult to estimate the consequences
>>>> onto measurement results. If this _intention_ is key, then I'm fine
>>>> with the wording. Otherwise one could think about a possible
>> rephrase.
>>>>
>>>> Summarizing: I consider this draft and its definitions to be
>>>> essential for the work and discussions of IPPM and related working
>>>> groups. It tackles the definitions it is supposed to and treats them
>>>> in adequate depth. As a first-time reader I had the impression that
>>>> some few sentences and clarifications can substantially improve the
>>>> categorization and delimiting of active/passive/hybrid methods in
>> sec.
>>>> 3.4-3.8 - I consider this to be the key part of the draft.
>>>>
>>>> regards
>>>> Joachim
>>>>
>>>>
>>>>
>>>> On 07.10.2015 12:47, Brian Trammell wrote:
>>>>> Greetings, all,
>>>>>
>>>>> WG last call on draft-ietf-ippm-active-passive-01 begins today, and
>>>> will end Wednesday 21 October 2015. Please send any comments
>>>> (including "I've read it and it's good" :) ) to the ippm@ietf.org
>>>> <mailto:ippm@ietf.org> list.
>>>>>
>>>>> Thanks, cheers,
>>>>>
>>>>> Brian (chair hat)
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> ippm mailing list
>>>>> ippm@ietf.org <mailto:ippm@ietf.org>
>>>>> https://www.ietf.org/mailman/listinfo/ippm
>>>>>
>>>>
>>>> _______________________________________________
>>>> ippm mailing list
>>>> ippm@ietf.org <mailto:ippm@ietf.org>
>>>> https://www.ietf.org/mailman/listinfo/ippm
>>>>
>>>>
>>>>
> 
> 


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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: "Black, David" <david.black@emc.com>, Spencer Dawkins <spencerdawkins.ietf@gmail.com>, The IESG <iesg@ietf.org>
Date: Thu, 22 Oct 2015 09:23:52 -0400
Thread-Topic: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: "Black, David" <david.black@emc.com>, Spencer Dawkins <spencerdawkins.ietf@gmail.com>, The IESG <iesg@ietf.org>
Date: Thu, 22 Oct 2015 10:06:40 -0400
Thread-Topic: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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Hi Mike,

Some arguments that I'd like to share (just thinking loudly). If I
understood your email correctly, main argument is that PDM is passive
because it appends the DO measurement header in the sending host and not
in intermediate hosts. Right?

To me this method still appears as hybrid because of two reasons:
a) the sending application is not aware of the monitoring and
b) at least one node along the path (in this case the sending host's
stack) triggers addition/deletion/modification of headers
_on_behalf_of_the_measurement_process_ as part of the measurement
method. Imho there is no need for an intermediate node (this might
require some fine-tuning in the draft text).

It's about measurement intent and roles, measurement methods may involve
distributed actors (like sender, receiver, intermediate nodes).
So, more specific: whenever the (potentially distributed) _measurement_
process/method inserts fields into (or modifies values of) passively
observed packets anywhere along the path, then this method is no longer
passive but hybrid.

If this constraint is not met, measurement header
additions/modifications could easily be shifted to another host upstream
in the path and state: "the modification is not co-located with (or
caused by) my observing instance" whenever I want my measurement method
to be labeled as "passive" instead of "hybrid".

The measurement intent is essential, as otherwise completely unrelated
packet modifications in intermediate nodes along the path could be
mis-interpreted to label the measurement as hybrid.

So I'd isolate the following (additional?) observations for passive
measurements to become hybrid:
a) measurement-"intent" must be present as the reason for adding fields
to or modifying values of observed packets along the path.
b) the instance that modifies packets (cf. (a)) need not (but may) be
co-located with passively observing measurement instances.
c) (not sure about this one): at least one observing instance of the
measurement process must be able to observe/read the modifications.

Al, what do you think? Is this covered by the current text or does it
require some addition?

thanks Mike for pointing out this issue,
Joachim


On 21.10.2015 16:35, Ackermann, Michael wrote:
> Joachim and All,
> 
> Great comments and the great  Active/Passive/Hybrid debate (that we have avoided having  for a couple years),   may finally be in the home stretch to resolution?  
> 
> We may not be able to conclude this over Email.  A live integrative conversion would be great, but may take hours?   We may want to provisionally plan on a BOF or after hours session for all who have interest or comments? 
> 
> Just a couple quick thoughts on what Joachim said below:
> 
> Methods like PDM and most Extension Headers should not be altered or even read by intermediate nodes.   PDM uses DOH for this reason.    We can site exceptions such as HOP by HOP EH's,  but PDM is exclusively DOH.    I guess that makes PDM "Usually"  Passive?     I say "Usually" because our intent is that PDM could be on all the time, OR,  PDM could be used as an exceptional debugging tool.   From what I understand right now,  the latter sense I would consider Hybrid.  
> 
> So, since I cannot totally ignore the global IPV6 EH debate,  I will add that it is conceivable that the presence of a DOH,  for PDM or any other purpose,  COULD elongate a packet to the point that an intermediate node is forced to process the packet in software, rather than hardware,  and that would alter network performance.  
> 
> I agree with Joachim that we need to consider that networks are getting more complex and that trend will continue.  This makes our Active/Passive/Hybrid debate more difficult,  but it also shows how important it is to understand and get right.  
> 
> I would also agree that any alterations made by an intermediate node should cause that method to be considered Hybrid.  
> 
> Thanks to all for the great discussions. 
> 
> Mike
> 
> 
> 
> 
> -----Original Message-----
> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Joachim Fabini
> Sent: Wednesday, October 21, 2015 3:20 AM
> To: Gregory Mirsky <gregory.mirsky@ericsson.com>; MORTON, ALFRED C (AL) <acmorton@att.com>; Greg Mirsky <gregimirsky@gmail.com>
> Cc: ippm@ietf.org
> Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
> 
> Hi Greg, all,
> 
> it's an interesting aspect that you raise. There are several perspectives to approach this issue - but I see all of them ending up in categorizing value changes as hybrid. Below my reasoning:
> 
> One key observation is that networks do no longer behave like stateless copper wires as we used to abstract them. Many networks and components store internal state and per-session or per-flow information.
> There is no way and no rule to predict the consequences of changing a single bit in packet payload or packet headers along an unknown path.
> 
> Whenever an intermediate node _adds_a_new_ field (e.g., PDM) to an observed packet, this changes the way the network treats the packet according to our traditional copper wire abstraction (packetDelay = defaultDelay + packetSize/linkCapacity). So there is no doubt that this is a hybrid case, right?
> 
> But there is no way to infer the consequence of marking packets (i.e., changing values of header fields beyond the basics required for IPv4 routing, meaning TTL and Checksum for IPv4) in the general case.
> My position is that this draft _must_ tackle the _most_general_ worst case. That is, value changes (potentially) modify the way an unknown path treats these packets.
> I agree that in particular scenarios (white-box measurements) the path and behavior of all of its links and systems might be known. In such a case I see, indeed, an overlapping of hybrid and passive - in the sense that the method is hybrid _and_ might be categorized as passive, too, when the white-box analysis indicates that marking (in terms of value
> changes) has no impact on the way the network treats the packets.
> 
> Still, my absolute preference is to address the most general case. Which means, that any packet modification by _measurement_ processes_ in intermediate nodes - this includes both, a) addition/deletion of fields or b) modification of _values_, labels this measurement method to belong to the hybrid category.
> 
> Another argument: Assume that there are several, overlapping measurements of packets ongoing along the same path. Some of them (a) strictly passive, observing, some of them (b) hybrid. The passive measurement (a) relies on specific packet checksums or hashes to identify a packet in subsequent intermediate nodes and has no knowledge of (b). Now assume that the hybrid measurement process (b) marks some packets (changes values, adds fields). This will potentially screw up (a)'s ability to identify packets.
> 
> But let's put this into the context of the theoretical IPPM framework:
> changing packet header values in intermediate nodes modifies the Type-P of the packet. Your measurement process might use a superset of Type-P (that ignores the marking) to categorize packets, other components might use subsets (that do _not_ ignore the marking). In the general case and for black-box paths, a measurement process can not predict the consequences of markings in intermediate nodes onto the Type-P treatment of all potential links and components along the path.
> 
> Just recently I found a surprisingly future-proof paragraph in RFC 2330 (RFC 2330, page 30, second paragraph):
> 
> "A closely related note: it would be very useful to know if a given Internet component treats equally a class C of different types of packets. If so, then any one of those types of packets can be used for subsequent measurement of the component. This suggests we devise a metric or suite of metrics that attempt to determine C."
> 
> Referencing this definition, one possible compromise could be the following observation (with explicit reference to the paragraph above):
> "hybrid measurements that mark packets of a class C in intermediate nodes may be categorized as passive, too, when all parties accessing these packets along the path (in between and including sender and
> receiver) categorize both types of packets, before the marking and afterwards, into the same class C".
> 
> Summarizing, my position is that whenever a measurement process changes packet header values in intermediate nodes this categorizes the process as hybrid.
> 
> Joachim
> 
> 
> On 21.10.2015 06:28, Gregory Mirsky wrote:
>> Hi Al,
>>
>> thank you for sharing you view. Perhaps I used â€œnormal behaviorâ€
>> somewhat too often and without clearly linking it to treatment, 
>> processing on a packet to which the measurement method in question 
>> directly applied. As Mike and I discussed PDM, weâ€™ve looked at the 
>> cases when the Optional header is already part of the packet and when 
>> the header must be added in order to support the PDM. In the first 
>> case I donâ€™t see that PDM alters processing on the packet by the 
>> network while in the second thereâ€™s clear impact as the packet size must be increased.
>>
>> Hope this example explains the context in which Iâ€™ve used â€œnormal 
>> network behaviorâ€.
>>
>>  
>>
>>                 Regards,
>>
>>                                 Greg
>>
>>  
>>
>> *From:*ippm [mailto:ippm-bounces@ietf.org] *On Behalf Of *MORTON, 
>> ALFRED C (AL)
>> *Sent:* Tuesday, October 20, 2015 7:36 PM
>> *To:* Greg Mirsky; Joachim Fabini
>> *Cc:* ippm@ietf.org
>> *Subject:* Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
>>
>>  
>>
>> Hi Greg,
>>
>>  
>>
>> I donâ€™t see a clear way to include impact on normal network behavior
>>
>> in a definition, because:
>>
>>  
>>
>> - the network behavior may be unknown.
>>
>> - the network behavior may change.
>>
>> - the network may react to any/every new packet.
>>
>> - the network can react to any packet feature that is in clear view.
>>
>>  
>>
>> We have discussed that some methods intend to have small impact,
>>
>> but we can never be certain that they will achieve this goal.
>>
>>  
>>
>> Al
>>
>>  
>>
>> *From:*ippm [mailto:ippm-bounces@ietf.org] *On Behalf Of *Greg Mirsky
>> *Sent:* Tuesday, October 20, 2015 6:12 PM
>> *To:* Joachim Fabini
>> *Cc:* ippm@ietf.org <mailto:ippm@ietf.org>
>> *Subject:* Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
>>
>>  
>>
>> Hi Joachim, et. al,
>>
>> I believe that characterization of a measurement method as active, 
>> passive or hybrid must be based on its impact on the otherwise normal 
>> network behavior. If the method alters the network behavior or 
>> treatment of the data, then it is active measurement method. If the 
>> method does not change network behavior in any aspect, then it is 
>> passive. Why I believe that is important? Because from this point, 
>> marking method that does not affect treatment of the flow by the 
>> network is passive, not active measurement method since marked and 
>> unmarked packets are indistinguishable to the network except for 
>> observer(s). But it the marking method applied in the manner that 
>> would change how marked packets being processed comparing to unmarked, then it is active method.
>>
>>  
>>
>> Regards,
>>
>> Greg
>>
>>  
>>
>> On Tue, Oct 13, 2015 at 3:10 AM, Joachim Fabini 
>> <Joachim.Fabini@tuwien.ac.at <mailto:Joachim.Fabini@tuwien.ac.at>> wrote:
>>
>> Hi Brian, Al, IPPM,
>>
>> I've read it and it's good... ;) The active-passive-hybrid definition 
>> and categorization helps enormously and should have been started years 
>> ago - many thanks to Al for taking the initiative. I consider this 
>> work to be relevant also for the scientific community. In particular 
>> the term hybrid is used with many diverging meanings (commonly as a 
>> buzzword when applying for new project funding), so I spent some time 
>> on reviewing and reasoning about. Disclaimer: I've not been involved 
>> into earlier discussions on this draft and it's the first time I read 
>> it. Consider it to be an unbiased first-time-reader opinion.
>>
>> Comments (sequential reading, _no_ priority ordering):
>>
>> Sec. 3.4 (1) s/"a packet stream..."/"Additional packet streams..."/ to 
>> be more generic? Any stream can be an aggregate of other streams, but 
>> the second variant seems to be more accurate and flexible (thinking of 
>> several streams with distinct sources and destinations for impairing 
>> distinct sub-paths of the measurement path).
>>
>> Sec. 3.4 (2) "The packets in the stream(s) of interest have fields (or 
>> are augmented or modified to include fields) which are dedicated to 
>> measurements"
>> Proposed (relaxing) addition: Instead of dedicated measurement fields 
>> an aggregated set of packet header _values_ can be sufficient to 
>> identify packets as being part of the active measurement stream.
>> Considering the hypothetical case of UDP BTC measurements, the traffic 
>> is actively generated, so the method is active. But packets are not 
>> marked, nor are there any specific fields like sequence numbers that 
>> can be used to identify packets. And for a UDP BTC metric there is no 
>> need for such. One could argue that packets of a UDP measurement 
>> stream can be identified by SRC/DST IP addresses and port numbers, 
>> which is why these fields are dedicated to measurement - but that's not intuitive.
>> Alternatively the two occurrences of "fields" could be replaced by 
>> "fields or field values". The key is that these specific measurement 
>> stream packets are selected/evaluated/measured in at least one 
>> measurement location. Possibly nitpicking?
>>
>> Sec. 3.4 (3) possible typo (known a' priori)
>>
>> Sec. 3.4: not sure: does it make sense to mention in a note  possible 
>> changes of packet type (Type-P) along the measurement path (e.g.
>> IPv4->IPv6, tunneling, addition of headers) and possible resulting
>> measurement issues? We address this issue in the IPv6 draft but my 
>> feeling is that it can help to raise reader's awareness in this draft, 
>> too. Type-P at the source does not necessarily mean same Type-P at the 
>> destination (same observation is valid for passively observing 
>> intermediate nodes)
>>
>> Sec. 3.6: What about Passive Measurements and generating background 
>> load? Consider the case of passive monitoring of a cellular link that 
>> does on-demand capacity allocation. The measurement process observes 
>> the measurement stream at ingress and egress. One might be tempted to 
>> generated some background load that triggers allocation of additional 
>> capacity on the link. Where does this method fit into: passive or 
>> hybrid? I'm not sure. As a matter of consistency with the section on 
>> active methods (where you mention background load traffic explicitly) 
>> it might be appropriate to discuss this special case for passive methods, too.
>>
>> Sec. 3.7: Last paragraph (sentence) is very long and difficult to 
>> understand, including possible typos. Should "basis of reference 
>> events as packet pass reference point" read "basis of reference events 
>> that are generated as packet_s_ pass reference points"? Rephrasing can help here.
>>
>> Sec. 3.8: The differentiation between hybride-active-passive is not 
>> clear to me from the definition in 3.8. I believe that the definition 
>> of "hybrid" {sh|c}ould be sharpened to delimit "hybrid" more 
>> accurately from active and passive.
>>
>> One particular case of hybrid measurement - imho the most compelling 
>> one
>> - is the one where passive measurements are combined with additions of 
>> fields or changes of field values in intermediate
>> (observation/measurement) nodes. This includes all kinds of packet 
>> markings, addition of header fields or changes in header field values 
>> in intermediate nodes. However, to make the measurement hybrid, these 
>> changes must be a _consequence_ or _result_ of actions undertaken by 
>> the (otherwise passive) _measurement_ process.
>> My personal opinion on this:
>> a) Active: whenever the measurement process generates a dedicated 
>> stream of measurement packets, where packets are identifiable either 
>> by dedicated measurement fields (either in payload or header), and/or 
>> by (possibly aggregated, i.e., set of) field values, the method/metric 
>> can be categorized as active
>> b) Passive: whenever the measurement process observes an existing 
>> stream of packets without changing/adding/removing any packet fields 
>> or field values. The passive monitoring _must_not_ add/change/remove 
>> header fields or header field values. Although passive monitoring 
>> might bias the timing of the observed traffic to some extent (be it by 
>> setting interfaces into promiscous mode or by inserting splitters into 
>> the path) it does not do this _intentionally_. Open question: into 
>> which category does the generation of background load for passive measurements fit?
>> c) Hybrid: the measurement acts exclusively on existing traffic, that 
>> is, anything that is categorized as passive (b). However, the 
>> _measurement_ process adds/changes/removes fields or changes packet 
>> field values in (intermediate) nodes as part of the measurement (may 
>> be header or payload). Obviously, IPv4 header updates that result from 
>> forwarding rules (checksum, TTL) are NOT part of the measurement 
>> process. Question: does "passive + background load" fit into hybrid?
>>
>> Sec. 3.8: Possible Typo: Y.1540 define_s_ -> _d_?
>>
>> Sec. 4: 1. Possible typo "effects" -> "biases"?
>>
>> Sec. 4: "To keep simple, we consider the stream effect only when it is 
>> present".
>> This statement imho conflicts with the main findings of RFC7312. 
>> Today's networks store flow/stream state at layers below IP, so 
>> networks have a "historic view". I doubt that this bias can be ignored 
>> - infact the bias of past periods is visible during the current 
>> measurement period. A mention of possible consequences in stateful 
>> networks with reference to
>> 7312 could be a cheap solution (not sure if this is sufficient).
>>
>> Sec. 4: ASCII diagram: it might improve readability to add axis labels 
>> (don't know how this can be done easily, maybe split/break 
>> descriptions of reference points onto several lines): y axis label: 
>> "Measurement stream capacity", x axis label: "Stream characteristics known".
>> In this context its's also not clear to me whether stream 
>> characteristics must be just "known" or if they must be 
>> controled/generated/changed.
>>
>> Sec. 4, 4.1, 4.2: Page 7: The examples (and detailed reasoning) are 
>> excellent here to support and illustrate the categories defined before.
>> Still, I believe that an earlier clear categorization 
>> active/passive/hybrid in sec. 3.8 can ease the reading.
>>
>> Sec. 4.1., 4.2: I fully agree with the categorization. However, is the 
>> "small effect" essential for these examples/statement? One could find 
>> several cases when the bias onto measurements is substantial - 
>> anything between a) "packets become too large when adding the PDM 
>> header and results in <IPv6-fragementation-required> to the sending 
>> host", b) "Size increase with PDM header makes stream to exceed a 
>> network threshold and trigger channel capacity re-allocation" and c) 
>> "subsequent nodes on the path drop these packets because of the measurement node modifications".
>> All of these actions should result in substantial bias of measurement 
>> results. And even the change of field values could result in 
>> intermediate nodes to apply distinct forwarding policies to the packets.
>>
>> The point is that the measurement process _intends_ to introduce a 
>> minimum bias but it's quite difficult to estimate the consequences 
>> onto measurement results. If this _intention_ is key, then I'm fine 
>> with the wording. Otherwise one could think about a possible rephrase.
>>
>> Summarizing: I consider this draft and its definitions to be essential 
>> for the work and discussions of IPPM and related working groups. It 
>> tackles the definitions it is supposed to and treats them in adequate 
>> depth. As a first-time reader I had the impression that some few 
>> sentences and clarifications can substantially improve the 
>> categorization and delimiting of active/passive/hybrid methods in sec.
>> 3.4-3.8 - I consider this to be the key part of the draft.
>>
>> regards
>> Joachim
>>
>>
>>
>> On 07.10.2015 12:47, Brian Trammell wrote:
>>> Greetings, all,
>>>
>>> WG last call on draft-ietf-ippm-active-passive-01 begins today, and
>> will end Wednesday 21 October 2015. Please send any comments 
>> (including "I've read it and it's good" :) ) to the ippm@ietf.org 
>> <mailto:ippm@ietf.org> list.
>>>
>>> Thanks, cheers,
>>>
>>> Brian (chair hat)
>>>
>>>
>>>
>>> _______________________________________________
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>>> ippm@ietf.org <mailto:ippm@ietf.org>
>>> https://www.ietf.org/mailman/listinfo/ippm
>>>
>>
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From: "Ackermann, Michael" <MAckermann@bcbsm.com>
To: Joachim Fabini <Joachim.Fabini@tuwien.ac.at>, "MORTON, ALFRED C (AL)" <acmorton@att.com>, Gregory Mirsky <gregory.mirsky@ericsson.com>, Greg Mirsky <gregimirsky@gmail.com>
Thread-Topic: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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Date: Thu, 22 Oct 2015 14:19:52 +0000
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Archived-At: <http://mailarchive.ietf.org/arch/msg/ippm/Jl90EmWkDwEmaws6vpVcle-aolQ>
Cc: "ippm@ietf.org" <ippm@ietf.org>
Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>, "MORTON, ALFRED C (AL)" <acmorton@att.com>
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Subject: Re: [ippm] Kathleen Moriarty's No Objection on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Date: Thu, 22 Oct 2015 10:42:20 -0400
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From: Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com>
To: Gregory Mirsky <gregory.mirsky@ericsson.com>
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Subject: Re: [ippm] Kathleen Moriarty's No Objection on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Thank you!

On Thu, Oct 22, 2015 at 10:39 AM, Gregory Mirsky
<gregory.mirsky@ericsson.com> wrote:
> Hi Kathleen,
> I'll include the text exactly as Al suggested.
>
>         Regards,
>                 Greg
>
> -----Original Message-----
> From: Kathleen Moriarty [mailto:kathleen.moriarty.ietf@gmail.com]
> Sent: Thursday, October 22, 2015 6:01 AM
> To: MORTON, ALFRED C (AL)
> Cc: Gregory Mirsky; The IESG; ippm-chairs@ietf.org; draft-ietf-ippm-type-p-monitor@ietf.org; ippm@ietf.org
> Subject: Re: Kathleen Moriarty's No Objection on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
>
> On Wed, Oct 21, 2015 at 9:48 PM, MORTON, ALFRED C (AL) <acmorton@att.com> wrote:
>> Hi Greg,
>>
>>
>>
>> I think Kathleen is asking for the Security Considerations Section
>>
>> to include references to sections in TWAMP where the various
>>
>> security modes are discussed.
>>
>>
>>
>> Sections such as 3.2, 4., 4.1.2, 4.2, and 4.2.1 of RFC 5357 discuss
>>
>> these modes in varying degrees of detail.
>
> Yes, that's exactly what I was looking to see added.
>
> Thanks!
> Kathleen
>
>>
>>
>>
>> Al
>>
>>
>>
>> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Gregory Mirsky
>> Sent: Wednesday, October 21, 2015 8:26 PM
>> To: Kathleen Moriarty; The IESG
>> Cc: ippm-chairs@ietf.org; draft-ietf-ippm-type-p-monitor@ietf.org;
>> ippm@ietf.org
>> Subject: Re: [ippm] Kathleen Moriarty's No Objection on
>> draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
>>
>>
>>
>> Dear Kathleen,
>>
>> thank you for your comment. I've found the discussion of the three
>> modes in Section 4.2.1. As the discussion was not placed in separate
>> sub-section referencing it directly, not the whole section, is a
>> challenge. Would greatly appreciate your suggestion. And, as I've been
>> asked question related to security, would appreciate your suggestion
>> on how best to relate this proposal with another draft from the IPPM
>> WG - IKEv2-derived Shared Secret Key for O/TWAMP
>> (draft-ietf-ippm-ipsec-11). Perhaps the following can be added into Security Considerations section:
>>
>> Methods and procedures to use shared key derived from Internet Key
>> Exchange Protocol Version 2 [RFC7296] described in
>> [I-D.ietf-ippm-ipsec] apply to DSCP and ECN Monitoring extension in full.
>>
>>
>>
>>         Regards,
>>
>>                 Greg
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: Kathleen Moriarty [mailto:Kathleen.Moriarty.ietf@gmail.com]
>> Sent: Wednesday, October 21, 2015 8:28 AM
>> To: The IESG
>> Cc: draft-ietf-ippm-type-p-monitor@ietf.org; ippm-chairs@ietf.org;
>> ietf@trammell.ch; ippm@ietf.org
>> Subject: Kathleen Moriarty's No Objection on
>> draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
>>
>>
>>
>> Kathleen Moriarty has entered the following ballot position for
>>
>> draft-ietf-ippm-type-p-monitor-02: No Objection
>>
>>
>>
>> When responding, please keep the subject line intact and reply to all
>> email addresses included in the To and CC lines. (Feel free to cut
>> this introductory paragraph, however.)
>>
>>
>>
>>
>>
>> Please refer to
>> https://www.ietf.org/iesg/statement/discuss-criteria.html
>>
>> for more information about IESG DISCUSS and COMMENT positions.
>>
>>
>>
>>
>>
>> The document, along with other ballot positions, can be found here:
>>
>> https://datatracker.ietf.org/doc/draft-ietf-ippm-type-p-monitor/
>>
>>
>>
>>
>>
>>
>>
>> ----------------------------------------------------------------------
>>
>> COMMENT:
>>
>> ----------------------------------------------------------------------
>>
>>
>>
>> Since rfc5357 has more discussion on the differences between
>> unauthenticated, authenticated, and encrypted modes, it would be
>> helpful to have a pointer to that specific point in the Security
>> Considerations section.
>>
>>
>>
>>
>>
>>
>
>
>
> --
>
> Best regards,
> Kathleen



-- 

Best regards,
Kathleen


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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "Black, David" <david.black@emc.com>, "MORTON, ALFRED C (AL)" <acmorton@att.com>, Spencer Dawkins <spencerdawkins.ietf@gmail.com>, The IESG <iesg@ietf.org>
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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: Joachim Fabini <Joachim.Fabini@tuwien.ac.at>, "Ackermann, Michael" <MAckermann@bcbsm.com>, Gregory Mirsky <gregory.mirsky@ericsson.com>, Greg Mirsky <gregimirsky@gmail.com>
Date: Thu, 22 Oct 2015 15:06:37 -0400
Thread-Topic: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: Gregory Mirsky <gregory.mirsky@ericsson.com>, Spencer Dawkins <spencerdawkins.ietf@gmail.com>, The IESG <iesg@ietf.org>, "Black, David" <david.black@emc.com>, Suresh Krishnan <suresh.krishnan@ericsson.com>
Date: Thu, 22 Oct 2015 17:51:11 -0400
Thread-Topic: Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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From nobody Thu Oct 22 15:17:36 2015
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, Spencer Dawkins <spencerdawkins.ietf@gmail.com>, The IESG <iesg@ietf.org>, "Black, David" <david.black@emc.com>, Suresh Krishnan <suresh.krishnan@ericsson.com>
Thread-Topic: Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: Gregory Mirsky <gregory.mirsky@ericsson.com>, Spencer Dawkins <spencerdawkins.ietf@gmail.com>, The IESG <iesg@ietf.org>, "Black, David" <david.black@emc.com>, Suresh Krishnan <suresh.krishnan@ericsson.com>
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--_000_4AF73AA205019A4C8A1DDD32C034631D0BB67F9B6CNJFPSRVEXG0re_--


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To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, "Ackermann, Michael" <MAckermann@bcbsm.com>, Gregory Mirsky <gregory.mirsky@ericsson.com>, Greg Mirsky <gregimirsky@gmail.com>
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From: Joachim Fabini <Joachim.Fabini@tuwien.ac.at>
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Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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Hi Al,

agreed, one (final) minor tweak proposal below:

On 22.10.2015 21:06, MORTON, ALFRED C (AL) wrote:
> [...]
> Joachim also indicated there might be a need to qualify Intermediate Nodes.
> Mike and Greg were also concerned with use of the term "mark", so I think we need
> to substitute terms from the method criteria: "augmented or modified".
> 
> We can again draw on RFC 2330 to help us with Path terminology:
> https://tools.ietf.org/html/rfc2330#section-5
> 
> Referencing the RFC 2330 Section 13 notion of "class C" and
> the RFC 2330 Section 5 terminology for paths:
> 
> Hybrid methods of measurement that augment or modify packets of a class C in
> a host should produce equivalent results to passive methods of measurement,
> when hosts accessing these packets along the path
> (other than those performing augmentation/modification)
> treat packets from both categories of methods
> (with and without the augmentation/modification) as the same class C.
> The passive methods of measurement represent the
> Ground Truth for comparisons of results between passive and hybrid methods,
> and this comparison should be conducted to confirm the class C treatment.

Proposed change in this phrase:
s/hosts accessing/hosts accessing and links transporting/
(where a better wording for "transporting" is highly welcome).

Including the links here is imho essential. One (admittedly strange)
example why we need this is Fig. 6a of
https://irtf.org/raim-2015-papers/raim-2015-paper18.pdf . Measurement
results are from a live network (384K DCH UMTS uplink).
A minimum _increase_ in packet size results in a systematic, substantial
_decrease_ of e2e packet delay.
Focusing on the delay block centered at 400 bytes payload and the
subsequent one it is visible that the limit is sharp: at one specific
payload size, one additional byte systematically decreases the e2e delay
by median 20ms of 75ms. So "passive" means for me, that we must exclude
the case of measurement augmentation triggering such strange _link_
behavior, too.

> hope that does it,

Yes, I hope that we're finally done. At least for me the picture of what
is hybrid and why we need this category has become much more clearer
during our discussion. Thanks again to all for your support and patience.
Joachim


>> -----Original Message-----
>> From: Joachim Fabini [mailto:Joachim.Fabini@tuwien.ac.at]
>> Sent: Thursday, October 22, 2015 10:07 AM
>> To: Ackermann, Michael; Gregory Mirsky; MORTON, ALFRED C (AL); Greg
>> Mirsky
>> Cc: ippm@ietf.org
>> Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
>>
>> Hi Mike,
>>
>> Some arguments that I'd like to share (just thinking loudly). If I
>> understood your email correctly, main argument is that PDM is passive
>> because it appends the DO measurement header in the sending host and not
>> in intermediate hosts. Right?
>>
>> To me this method still appears as hybrid because of two reasons:
>> a) the sending application is not aware of the monitoring and
>> b) at least one node along the path (in this case the sending host's
>> stack) triggers addition/deletion/modification of headers
>> _on_behalf_of_the_measurement_process_ as part of the measurement
>> method. Imho there is no need for an intermediate node (this might
>> require some fine-tuning in the draft text).
>>
>> It's about measurement intent and roles, measurement methods may involve
>> distributed actors (like sender, receiver, intermediate nodes).
>> So, more specific: whenever the (potentially distributed) _measurement_
>> process/method inserts fields into (or modifies values of) passively
>> observed packets anywhere along the path, then this method is no longer
>> passive but hybrid.
>>
>> If this constraint is not met, measurement header
>> additions/modifications could easily be shifted to another host upstream
>> in the path and state: "the modification is not co-located with (or
>> caused by) my observing instance" whenever I want my measurement method
>> to be labeled as "passive" instead of "hybrid".
>>
>> The measurement intent is essential, as otherwise completely unrelated
>> packet modifications in intermediate nodes along the path could be mis-
>> interpreted to label the measurement as hybrid.
>>
>> So I'd isolate the following (additional?) observations for passive
>> measurements to become hybrid:
>> a) measurement-"intent" must be present as the reason for adding fields
>> to or modifying values of observed packets along the path.
>> b) the instance that modifies packets (cf. (a)) need not (but may) be
>> co-located with passively observing measurement instances.
>> c) (not sure about this one): at least one observing instance of the
>> measurement process must be able to observe/read the modifications.
>>
>> Al, what do you think? Is this covered by the current text or does it
>> require some addition?
>>
>> thanks Mike for pointing out this issue, Joachim
>>
>>
>> On 21.10.2015 16:35, Ackermann, Michael wrote:
>>> Joachim and All,
>>>
>>> Great comments and the great  Active/Passive/Hybrid debate (that we
>> have avoided having  for a couple years),   may finally be in the home
>> stretch to resolution?
>>>
>>> We may not be able to conclude this over Email.  A live integrative
>> conversion would be great, but may take hours?   We may want to
>> provisionally plan on a BOF or after hours session for all who have
>> interest or comments?
>>>
>>> Just a couple quick thoughts on what Joachim said below:
>>>
>>> Methods like PDM and most Extension Headers should not be altered or
>> even read by intermediate nodes.   PDM uses DOH for this reason.    We
>> can site exceptions such as HOP by HOP EH's,  but PDM is exclusively
>> DOH.    I guess that makes PDM "Usually"  Passive?     I say "Usually"
>> because our intent is that PDM could be on all the time, OR,  PDM could
>> be used as an exceptional debugging tool.   From what I understand right
>> now,  the latter sense I would consider Hybrid.
>>>
>>> So, since I cannot totally ignore the global IPV6 EH debate,  I will
>> add that it is conceivable that the presence of a DOH,  for PDM or any
>> other purpose,  COULD elongate a packet to the point that an
>> intermediate node is forced to process the packet in software, rather
>> than hardware,  and that would alter network performance.
>>>
>>> I agree with Joachim that we need to consider that networks are
>> getting more complex and that trend will continue.  This makes our
>> Active/Passive/Hybrid debate more difficult,  but it also shows how
>> important it is to understand and get right.
>>>
>>> I would also agree that any alterations made by an intermediate node
>> should cause that method to be considered Hybrid.
>>>
>>> Thanks to all for the great discussions.
>>>
>>> Mike
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: ippm [mailto:ippm-bounces@ietf.org] On Behalf Of Joachim Fabini
>>> Sent: Wednesday, October 21, 2015 3:20 AM
>>> To: Gregory Mirsky <gregory.mirsky@ericsson.com>; MORTON, ALFRED C
>>> (AL) <acmorton@att.com>; Greg Mirsky <gregimirsky@gmail.com>
>>> Cc: ippm@ietf.org
>>> Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
>>>
>>> Hi Greg, all,
>>>
>>> it's an interesting aspect that you raise. There are several
>> perspectives to approach this issue - but I see all of them ending up in
>> categorizing value changes as hybrid. Below my reasoning:
>>>
>>> One key observation is that networks do no longer behave like
>> stateless copper wires as we used to abstract them. Many networks and
>> components store internal state and per-session or per-flow information.
>>> There is no way and no rule to predict the consequences of changing a
>> single bit in packet payload or packet headers along an unknown path.
>>>
>>> Whenever an intermediate node _adds_a_new_ field (e.g., PDM) to an
>> observed packet, this changes the way the network treats the packet
>> according to our traditional copper wire abstraction (packetDelay =
>> defaultDelay + packetSize/linkCapacity). So there is no doubt that this
>> is a hybrid case, right?
>>>
>>> But there is no way to infer the consequence of marking packets (i.e.,
>> changing values of header fields beyond the basics required for IPv4
>> routing, meaning TTL and Checksum for IPv4) in the general case.
>>> My position is that this draft _must_ tackle the _most_general_ worst
>> case. That is, value changes (potentially) modify the way an unknown
>> path treats these packets.
>>> I agree that in particular scenarios (white-box measurements) the path
>>> and behavior of all of its links and systems might be known. In such a
>>> case I see, indeed, an overlapping of hybrid and passive - in the
>>> sense that the method is hybrid _and_ might be categorized as passive,
>>> too, when the white-box analysis indicates that marking (in terms of
>>> value
>>> changes) has no impact on the way the network treats the packets.
>>>
>>> Still, my absolute preference is to address the most general case.
>> Which means, that any packet modification by _measurement_ processes_ in
>> intermediate nodes - this includes both, a) addition/deletion of fields
>> or b) modification of _values_, labels this measurement method to belong
>> to the hybrid category.
>>>
>>> Another argument: Assume that there are several, overlapping
>> measurements of packets ongoing along the same path. Some of them (a)
>> strictly passive, observing, some of them (b) hybrid. The passive
>> measurement (a) relies on specific packet checksums or hashes to
>> identify a packet in subsequent intermediate nodes and has no knowledge
>> of (b). Now assume that the hybrid measurement process (b) marks some
>> packets (changes values, adds fields). This will potentially screw up
>> (a)'s ability to identify packets.
>>>
>>> But let's put this into the context of the theoretical IPPM framework:
>>> changing packet header values in intermediate nodes modifies the Type-
>> P of the packet. Your measurement process might use a superset of Type-P
>> (that ignores the marking) to categorize packets, other components might
>> use subsets (that do _not_ ignore the marking). In the general case and
>> for black-box paths, a measurement process can not predict the
>> consequences of markings in intermediate nodes onto the Type-P treatment
>> of all potential links and components along the path.
>>>
>>> Just recently I found a surprisingly future-proof paragraph in RFC
>> 2330 (RFC 2330, page 30, second paragraph):
>>>
>>> "A closely related note: it would be very useful to know if a given
>> Internet component treats equally a class C of different types of
>> packets. If so, then any one of those types of packets can be used for
>> subsequent measurement of the component. This suggests we devise a
>> metric or suite of metrics that attempt to determine C."
>>>
>>> Referencing this definition, one possible compromise could be the
>> following observation (with explicit reference to the paragraph above):
>>> "hybrid measurements that mark packets of a class C in intermediate
>>> nodes may be categorized as passive, too, when all parties accessing
>>> these packets along the path (in between and including sender and
>>> receiver) categorize both types of packets, before the marking and
>> afterwards, into the same class C".
>>>
>>> Summarizing, my position is that whenever a measurement process
>> changes packet header values in intermediate nodes this categorizes the
>> process as hybrid.
>>>
>>> Joachim
>>>
>>>
>>> On 21.10.2015 06:28, Gregory Mirsky wrote:
>>>> Hi Al,
>>>>
>>>> thank you for sharing you view. Perhaps I used â€œnormal behaviorâ€
>>>> somewhat too often and without clearly linking it to treatment,
>>>> processing on a packet to which the measurement method in question
>>>> directly applied. As Mike and I discussed PDM, weâ€™ve looked at the
>>>> cases when the Optional header is already part of the packet and when
>>>> the header must be added in order to support the PDM. In the first
>>>> case I donâ€™t see that PDM alters processing on the packet by the
>>>> network while in the second thereâ€™s clear impact as the packet size
>> must be increased.
>>>>
>>>> Hope this example explains the context in which Iâ€™ve used â€œnormal
>>>> network behaviorâ€.
>>>>
>>>>
>>>>
>>>>                 Regards,
>>>>
>>>>                                 Greg
>>>>
>>>>
>>>>
>>>> *From:*ippm [mailto:ippm-bounces@ietf.org] *On Behalf Of *MORTON,
>>>> ALFRED C (AL)
>>>> *Sent:* Tuesday, October 20, 2015 7:36 PM
>>>> *To:* Greg Mirsky; Joachim Fabini
>>>> *Cc:* ippm@ietf.org
>>>> *Subject:* Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
>>>>
>>>>
>>>>
>>>> Hi Greg,
>>>>
>>>>
>>>>
>>>> I donâ€™t see a clear way to include impact on normal network behavior
>>>>
>>>> in a definition, because:
>>>>
>>>>
>>>>
>>>> - the network behavior may be unknown.
>>>>
>>>> - the network behavior may change.
>>>>
>>>> - the network may react to any/every new packet.
>>>>
>>>> - the network can react to any packet feature that is in clear view.
>>>>
>>>>
>>>>
>>>> We have discussed that some methods intend to have small impact,
>>>>
>>>> but we can never be certain that they will achieve this goal.
>>>>
>>>>
>>>>
>>>> Al
>>>>
>>>>
>>>>
>>>> *From:*ippm [mailto:ippm-bounces@ietf.org] *On Behalf Of *Greg Mirsky
>>>> *Sent:* Tuesday, October 20, 2015 6:12 PM
>>>> *To:* Joachim Fabini
>>>> *Cc:* ippm@ietf.org <mailto:ippm@ietf.org>
>>>> *Subject:* Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
>>>>
>>>>
>>>>
>>>> Hi Joachim, et. al,
>>>>
>>>> I believe that characterization of a measurement method as active,
>>>> passive or hybrid must be based on its impact on the otherwise normal
>>>> network behavior. If the method alters the network behavior or
>>>> treatment of the data, then it is active measurement method. If the
>>>> method does not change network behavior in any aspect, then it is
>>>> passive. Why I believe that is important? Because from this point,
>>>> marking method that does not affect treatment of the flow by the
>>>> network is passive, not active measurement method since marked and
>>>> unmarked packets are indistinguishable to the network except for
>>>> observer(s). But it the marking method applied in the manner that
>>>> would change how marked packets being processed comparing to
>> unmarked, then it is active method.
>>>>
>>>>
>>>>
>>>> Regards,
>>>>
>>>> Greg
>>>>
>>>>
>>>>
>>>> On Tue, Oct 13, 2015 at 3:10 AM, Joachim Fabini
>>>> <Joachim.Fabini@tuwien.ac.at <mailto:Joachim.Fabini@tuwien.ac.at>>
>> wrote:
>>>>
>>>> Hi Brian, Al, IPPM,
>>>>
>>>> I've read it and it's good... ;) The active-passive-hybrid definition
>>>> and categorization helps enormously and should have been started
>>>> years ago - many thanks to Al for taking the initiative. I consider
>>>> this work to be relevant also for the scientific community. In
>>>> particular the term hybrid is used with many diverging meanings
>>>> (commonly as a buzzword when applying for new project funding), so I
>>>> spent some time on reviewing and reasoning about. Disclaimer: I've
>>>> not been involved into earlier discussions on this draft and it's the
>>>> first time I read it. Consider it to be an unbiased first-time-reader
>> opinion.
>>>>
>>>> Comments (sequential reading, _no_ priority ordering):
>>>>
>>>> Sec. 3.4 (1) s/"a packet stream..."/"Additional packet streams..."/
>>>> to be more generic? Any stream can be an aggregate of other streams,
>>>> but the second variant seems to be more accurate and flexible
>>>> (thinking of several streams with distinct sources and destinations
>>>> for impairing distinct sub-paths of the measurement path).
>>>>
>>>> Sec. 3.4 (2) "The packets in the stream(s) of interest have fields
>>>> (or are augmented or modified to include fields) which are dedicated
>>>> to measurements"
>>>> Proposed (relaxing) addition: Instead of dedicated measurement fields
>>>> an aggregated set of packet header _values_ can be sufficient to
>>>> identify packets as being part of the active measurement stream.
>>>> Considering the hypothetical case of UDP BTC measurements, the
>>>> traffic is actively generated, so the method is active. But packets
>>>> are not marked, nor are there any specific fields like sequence
>>>> numbers that can be used to identify packets. And for a UDP BTC
>>>> metric there is no need for such. One could argue that packets of a
>>>> UDP measurement stream can be identified by SRC/DST IP addresses and
>>>> port numbers, which is why these fields are dedicated to measurement
>> - but that's not intuitive.
>>>> Alternatively the two occurrences of "fields" could be replaced by
>>>> "fields or field values". The key is that these specific measurement
>>>> stream packets are selected/evaluated/measured in at least one
>>>> measurement location. Possibly nitpicking?
>>>>
>>>> Sec. 3.4 (3) possible typo (known a' priori)
>>>>
>>>> Sec. 3.4: not sure: does it make sense to mention in a note  possible
>>>> changes of packet type (Type-P) along the measurement path (e.g.
>>>> IPv4->IPv6, tunneling, addition of headers) and possible resulting
>>>> measurement issues? We address this issue in the IPv6 draft but my
>>>> feeling is that it can help to raise reader's awareness in this
>>>> draft, too. Type-P at the source does not necessarily mean same
>>>> Type-P at the destination (same observation is valid for passively
>>>> observing intermediate nodes)
>>>>
>>>> Sec. 3.6: What about Passive Measurements and generating background
>>>> load? Consider the case of passive monitoring of a cellular link that
>>>> does on-demand capacity allocation. The measurement process observes
>>>> the measurement stream at ingress and egress. One might be tempted to
>>>> generated some background load that triggers allocation of additional
>>>> capacity on the link. Where does this method fit into: passive or
>>>> hybrid? I'm not sure. As a matter of consistency with the section on
>>>> active methods (where you mention background load traffic explicitly)
>>>> it might be appropriate to discuss this special case for passive
>> methods, too.
>>>>
>>>> Sec. 3.7: Last paragraph (sentence) is very long and difficult to
>>>> understand, including possible typos. Should "basis of reference
>>>> events as packet pass reference point" read "basis of reference
>>>> events that are generated as packet_s_ pass reference points"?
>> Rephrasing can help here.
>>>>
>>>> Sec. 3.8: The differentiation between hybride-active-passive is not
>>>> clear to me from the definition in 3.8. I believe that the definition
>>>> of "hybrid" {sh|c}ould be sharpened to delimit "hybrid" more
>>>> accurately from active and passive.
>>>>
>>>> One particular case of hybrid measurement - imho the most compelling
>>>> one
>>>> - is the one where passive measurements are combined with additions
>>>> of fields or changes of field values in intermediate
>>>> (observation/measurement) nodes. This includes all kinds of packet
>>>> markings, addition of header fields or changes in header field values
>>>> in intermediate nodes. However, to make the measurement hybrid, these
>>>> changes must be a _consequence_ or _result_ of actions undertaken by
>>>> the (otherwise passive) _measurement_ process.
>>>> My personal opinion on this:
>>>> a) Active: whenever the measurement process generates a dedicated
>>>> stream of measurement packets, where packets are identifiable either
>>>> by dedicated measurement fields (either in payload or header), and/or
>>>> by (possibly aggregated, i.e., set of) field values, the
>>>> method/metric can be categorized as active
>>>> b) Passive: whenever the measurement process observes an existing
>>>> stream of packets without changing/adding/removing any packet fields
>>>> or field values. The passive monitoring _must_not_ add/change/remove
>>>> header fields or header field values. Although passive monitoring
>>>> might bias the timing of the observed traffic to some extent (be it
>>>> by setting interfaces into promiscous mode or by inserting splitters
>>>> into the path) it does not do this _intentionally_. Open question:
>>>> into which category does the generation of background load for
>> passive measurements fit?
>>>> c) Hybrid: the measurement acts exclusively on existing traffic, that
>>>> is, anything that is categorized as passive (b). However, the
>>>> _measurement_ process adds/changes/removes fields or changes packet
>>>> field values in (intermediate) nodes as part of the measurement (may
>>>> be header or payload). Obviously, IPv4 header updates that result
>>>> from forwarding rules (checksum, TTL) are NOT part of the measurement
>>>> process. Question: does "passive + background load" fit into hybrid?
>>>>
>>>> Sec. 3.8: Possible Typo: Y.1540 define_s_ -> _d_?
>>>>
>>>> Sec. 4: 1. Possible typo "effects" -> "biases"?
>>>>
>>>> Sec. 4: "To keep simple, we consider the stream effect only when it
>>>> is present".
>>>> This statement imho conflicts with the main findings of RFC7312.
>>>> Today's networks store flow/stream state at layers below IP, so
>>>> networks have a "historic view". I doubt that this bias can be
>>>> ignored
>>>> - infact the bias of past periods is visible during the current
>>>> measurement period. A mention of possible consequences in stateful
>>>> networks with reference to
>>>> 7312 could be a cheap solution (not sure if this is sufficient).
>>>>
>>>> Sec. 4: ASCII diagram: it might improve readability to add axis
>>>> labels (don't know how this can be done easily, maybe split/break
>>>> descriptions of reference points onto several lines): y axis label:
>>>> "Measurement stream capacity", x axis label: "Stream characteristics
>> known".
>>>> In this context its's also not clear to me whether stream
>>>> characteristics must be just "known" or if they must be
>>>> controled/generated/changed.
>>>>
>>>> Sec. 4, 4.1, 4.2: Page 7: The examples (and detailed reasoning) are
>>>> excellent here to support and illustrate the categories defined
>> before.
>>>> Still, I believe that an earlier clear categorization
>>>> active/passive/hybrid in sec. 3.8 can ease the reading.
>>>>
>>>> Sec. 4.1., 4.2: I fully agree with the categorization. However, is
>>>> the "small effect" essential for these examples/statement? One could
>>>> find several cases when the bias onto measurements is substantial -
>>>> anything between a) "packets become too large when adding the PDM
>>>> header and results in <IPv6-fragementation-required> to the sending
>>>> host", b) "Size increase with PDM header makes stream to exceed a
>>>> network threshold and trigger channel capacity re-allocation" and c)
>>>> "subsequent nodes on the path drop these packets because of the
>> measurement node modifications".
>>>> All of these actions should result in substantial bias of measurement
>>>> results. And even the change of field values could result in
>>>> intermediate nodes to apply distinct forwarding policies to the
>> packets.
>>>>
>>>> The point is that the measurement process _intends_ to introduce a
>>>> minimum bias but it's quite difficult to estimate the consequences
>>>> onto measurement results. If this _intention_ is key, then I'm fine
>>>> with the wording. Otherwise one could think about a possible
>> rephrase.
>>>>
>>>> Summarizing: I consider this draft and its definitions to be
>>>> essential for the work and discussions of IPPM and related working
>>>> groups. It tackles the definitions it is supposed to and treats them
>>>> in adequate depth. As a first-time reader I had the impression that
>>>> some few sentences and clarifications can substantially improve the
>>>> categorization and delimiting of active/passive/hybrid methods in
>> sec.
>>>> 3.4-3.8 - I consider this to be the key part of the draft.
>>>>
>>>> regards
>>>> Joachim
>>>>
>>>>
>>>>
>>>> On 07.10.2015 12:47, Brian Trammell wrote:
>>>>> Greetings, all,
>>>>>
>>>>> WG last call on draft-ietf-ippm-active-passive-01 begins today, and
>>>> will end Wednesday 21 October 2015. Please send any comments
>>>> (including "I've read it and it's good" :) ) to the ippm@ietf.org
>>>> <mailto:ippm@ietf.org> list.
>>>>>
>>>>> Thanks, cheers,
>>>>>
>>>>> Brian (chair hat)
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> ippm mailing list
>>>>> ippm@ietf.org <mailto:ippm@ietf.org>
>>>>> https://www.ietf.org/mailman/listinfo/ippm
>>>>>
>>>>
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>>>>
>>>>
>>>>
>>>
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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
To: Joachim Fabini <Joachim.Fabini@tuwien.ac.at>, "Ackermann, Michael" <MAckermann@bcbsm.com>, Gregory Mirsky <gregory.mirsky@ericsson.com>
Date: Fri, 23 Oct 2015 08:01:50 -0400
Thread-Topic: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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From: "Ackermann, Michael" <MAckermann@bcbsm.com>
To: Joachim Fabini <Joachim.Fabini@tuwien.ac.at>, "MORTON, ALFRED C (AL)" <acmorton@att.com>, Gregory Mirsky <gregory.mirsky@ericsson.com>, Greg Mirsky <gregimirsky@gmail.com>
Thread-Topic: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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Subject: Re: [ippm] WGLC on draft-ietf-ippm-active-passive-01
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From nobody Fri Oct 23 12:13:23 2015
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Date: Fri, 23 Oct 2015 14:13:02 -0500
Message-ID: <CAKKJt-c902yHN0iseOnm=YTwN=OsagbVU_F1WUmveMArdFn4hQ@mail.gmail.com>
From: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>
To: "MORTON, ALFRED C (AL)" <acmorton@att.com>
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Cc: "ippm-chairs@ietf.org" <ippm-chairs@ietf.org>, "ippm@ietf.org" <ippm@ietf.org>, "Black, David" <david.black@emc.com>, Suresh Krishnan <suresh.krishnan@ericsson.com>, The IESG <iesg@ietf.org>, "draft-ietf-ippm-type-p-monitor@ietf.org" <draft-ietf-ippm-type-p-monitor@ietf.org>
Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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--001a11438ee8846c090522ca6652
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I'm putting my summary of how other comments have been addressed in this
thread, just to keep everything in one place. Spoiler alert - they've
mostly been addressed! But please see below.


   - Alvero's comment - looks addressed, but there was a nit in the
   proposed text.
   - Benoit's comment - just referenced Al's OPSDIR review. Not addressed
   in this thread, but addressed in Al's OPSDIR review thread.
   - Ben's comment - looks addressed.
   - Al's OPSDIR review - looks addressed.
   - Suresh's Gen-ART review - looks addressed.
   - Kathleen's comment - looks addressed.
   - Spencer's comment - this was based on a conversation I had with David
   Black. It looks mostly addressed in the unsubmitted -03 version, with on=
e
   question remaining.

In this text:

   o  if the negotiated/provisioned ECN value is not known, ECN SHOULD
       be set to Not-ECT codepoint value [RFC3168].  Otherwise, the
       provisioned ECN value for the session SHALL be used.

David pointed out that TWAMP isn't ECN-responsive. He said perhaps saying
"stop when CE=3D1" would make sense as the least complicated response
possible, but also said we're pretty late in the process to be making
changes like that. I agree on "pretty late", and also wonder if anything
that does need to be said about ECN with TWAMP belongs in another draft
(this one's describing an optional extension, so there's no reason anyone
would be looking at it for guidance about ECN).

I also noted that TWAMP hasn't been ECN-responsive since -00 of the
individual base protocol draft, so maybe this isn't urgent (simply because
sending rates are low enough that reflection packet rates are low enough
that they aren't significant contributors to congestion).

Is that the way it's looking to others?

Spencer

On Thu, Oct 22, 2015 at 5:33 PM, MORTON, ALFRED C (AL) <acmorton@att.com>
wrote:

> That=E2=80=99s fine, =E2=80=9Cextract: has to go with the received inform=
ation.
>
>
>
> *From:* Gregory Mirsky [mailto:gregory.mirsky@ericsson.com]
> *Sent:* Thursday, October 22, 2015 6:17 PM
> *To:* MORTON, ALFRED C (AL); Spencer Dawkins; The IESG; Black, David;
> Suresh Krishnan
>
> *Cc:* draft-ietf-ippm-type-p-monitor@ietf.org; ippm-chairs@ietf.org;
> ippm@ietf.org
> *Subject:* RE: Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02:
> (with COMMENT)
>
>
>
> Hi Al,
>
> thank you for your thorough check of the update. Would the following be
> acceptable:
>
> the Session-Reflector MUST extract DSCP and ECN values from the received
> packet and MUST populate with them the S-DSCP-ECN field of the
> corresponding reflected packet;
>
>
>
>                 Regards,
>
>                                 Greg
>
>
>
>
>
> *From:* MORTON, ALFRED C (AL) [mailto:acmorton@att.com <acmorton@att.com>=
]
>
> *Sent:* Thursday, October 22, 2015 2:51 PM
> *To:* Gregory Mirsky; Spencer Dawkins; The IESG; Black, David; Suresh
> Krishnan
> *Cc:* draft-ietf-ippm-type-p-monitor@ietf.org; ippm-chairs@ietf.org;
> ippm@ietf.org
> *Subject:* RE: Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02:
> (with COMMENT)
>
>
>
> Hi Greg, I noticed that this bullet=E2=80=99s wording:
>
>
>
> o  the Session-Reflector MUST extract the S-DSCP-ECN value from the
>
>    DSCP and ECN values of received packets;
>
>
>
> seems to reverse the meaning of =E2=80=9Cextract=E2=80=9D, and would prob=
ably
>
> be better if worded:
>
>
>
> o  the Session-Reflector MUST populate the S-DSCP-ECN value with the
>
>    DSCP and ECN values extracted from the corresponding the received
> packet;
>
>
>
> Sorry, I don=E2=80=99t know why I missed this before.
>
> Otherwise, I think this is what we want.
>
> thanks,
>
> Al
>
>
>
> *From:* Gregory Mirsky [mailto:gregory.mirsky@ericsson.com
> <gregory.mirsky@ericsson.com>]
> *Sent:* Thursday, October 22, 2015 12:40 PM
> *To:* Spencer Dawkins; The IESG; MORTON, ALFRED C (AL); Black, David;
> Kathleen Moriarty (Kathleen.Moriarty.ietf@gmail.com); Suresh Krishnan;
> Ben Campbell (ben@nostrum.com); Alvaro Retana (aretana) (aretana@cisco.co=
m
> )
> *Cc:* draft-ietf-ippm-type-p-monitor@ietf.org; ippm-chairs@ietf.org;
> ietf@trammell.ch; ippm@ietf.org
> *Subject:* RE: Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02:
> (with COMMENT)
>
>
>
> Dear All,
>
> thank you all for your reviews, comments, help and patience.
>
> Attached are:
>
> =C2=B7         diff with highlighted updates;
>
> =C2=B7         -03 version that includes all the updates.
>
> Hope that you find your comments have been satisfactorily addressed.
>
>
>
>                 Regards,
>
>                                 Greg
>
>
>
>
>
> -----Original Message-----
> From: Spencer Dawkins [mailto:spencerdawkins.ietf@gmail.com
> <spencerdawkins.ietf@gmail.com>]
> Sent: Thursday, October 22, 2015 4:45 AM
> To: The IESG
> Cc: draft-ietf-ippm-type-p-monitor@ietf.org; ippm-chairs@ietf.org;
> ietf@trammell.ch; ippm@ietf.org; david.black@emc.com
> Subject: Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with
> COMMENT)
>
>
>
> Spencer Dawkins has entered the following ballot position for
>
> draft-ietf-ippm-type-p-monitor-02: Yes
>
>
>
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut this
> introductory paragraph, however.)
>
>
>
>
>
> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
>
> for more information about IESG DISCUSS and COMMENT positions.
>
>
>
>
>
> The document, along with other ballot positions, can be found here:
>
> https://datatracker.ietf.org/doc/draft-ietf-ippm-type-p-monitor/
>
>
>
>
>
>
>
> ----------------------------------------------------------------------
>
> COMMENT:
>
> ----------------------------------------------------------------------
>
>
>
> My apologies for thinking slowly ... but it doesn't look like these
> questions will be difficult to resolve.
>
>
>
> I talked with David Black about this draft, and he had questions that I
> translated into AD-speak as:
>
>
>
> Reflecting an unknown DSCP value is a MAY. Can reflecting packets using a
> DSCP value you don't understand be a bad idea? How important is that the
> DSCP value is NOT 0 (CS0, default forwarding)?
>
>
>
> If you are reflecting a DSCP value, are you also reflecting the ECN(0) bi=
t
> unchanged?
>
>
>
> TWAMP doesn't look congestion-controlled to me (certainly not in the
> reflected direction - https://tools.ietf.org/html/rfc5357 says the packet
> is reflected as quickly/immediately as possible in at least three places =
I
> can see. What is a typical sending rate for the Session-Sender, and is th=
at
> likely to cause problems in the reflected direction?
>
>
>
> His note to me follows:
>
>
>
> This bullet at the end of 2.2.2 bothers me:
>
>
>
>    o  if the negotiated/provisioned DSCP value is not known (e.g.  TWAMP
>
>       Light), the choice of the DSCP is implementation specific.  For
>
>       instance, Session-Reflector MAY copy the DSCP value from the
>
>       received test packet and set it as DSCP in a reflected packet
>
>
>
> This is implicitly recommending reflection of the DSCP value, and by
> omitted implication, reflection of the ECN value.  Both of those seem lik=
e
> bad ideas, it would be better to say that in this case the DSCP should be
> set to 0 (CS0, Default forwarding).  I would also say that the ECN field
> MUST be set to 0 (not-ECT) in the reflected packet, always.
>
>
>
> I=E2=80=99m a bit concerned about setting ECT(0) or ECT(1) on the forward
> measurement path, as TWAMP is not congestion-responsive.  Is the
> transmission rate of TWAMP low enough to not cause a problem if CE signal=
s
> are received and ignored in the ECN field at the Reflector?
>
>
>
>
>

--001a11438ee8846c090522ca6652
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">I&#39;m putting my summary of how other comments have been=
 addressed in this thread, just to keep everything in one place. Spoiler al=
ert - they&#39;ve mostly been addressed! But please see below.<div><br></di=
v><div><div><ul><li>Alvero&#39;s comment - looks addressed, but there was a=
 nit in the proposed text.</li><li>Benoit&#39;s comment - just referenced A=
l&#39;s OPSDIR review. Not addressed in this thread, but addressed in Al&#3=
9;s OPSDIR review thread.</li><li>Ben&#39;s comment - looks addressed.</li>=
<li>Al&#39;s OPSDIR review - looks addressed.</li><li>Suresh&#39;s Gen-ART =
review - looks addressed.</li><li>Kathleen&#39;s comment - looks addressed.=
</li><li>Spencer&#39;s comment - this was based on a conversation I had wit=
h David Black. It looks mostly addressed in the unsubmitted -03 version, wi=
th one question remaining.</li></ul></div><div>In this text:</div><div><br>=
</div><div>=C2=A0 =C2=A0o =C2=A0if the negotiated/provisioned ECN value is =
not known, ECN SHOULD<span style=3D"white-space:pre-wrap">	</span></div><di=
v>=C2=A0<span style=3D"white-space:pre-wrap">	</span> =C2=A0 =C2=A0 =C2=A0b=
e set to Not-ECT codepoint value [RFC3168].=C2=A0 Otherwise, the<span style=
=3D"white-space:pre-wrap">	</span></div><div>=C2=A0<span style=3D"white-spa=
ce:pre-wrap">	</span> =C2=A0 =C2=A0 =C2=A0provisioned ECN value for the ses=
sion SHALL be used.</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0</div=
><div>David pointed out that TWAMP isn&#39;t ECN-responsive. He said perhap=
s saying &quot;stop when CE=3D1&quot; would make sense as the least complic=
ated response possible, but also said we&#39;re pretty late in the process =
to be making changes like that. I agree on &quot;pretty late&quot;, and als=
o wonder if anything that does need to be said about ECN with TWAMP belongs=
 in another draft (this one&#39;s describing an optional extension, so ther=
e&#39;s no reason anyone would be looking at it for guidance about ECN).=C2=
=A0</div><div><br></div><div>I also noted that TWAMP hasn&#39;t been ECN-re=
sponsive since -00 of the individual base protocol draft, so maybe this isn=
&#39;t urgent (simply because sending rates are low enough that reflection =
packet rates are low enough that they aren&#39;t significant contributors t=
o congestion).</div><div><br></div><div>Is that the way it&#39;s looking to=
 others?</div><div><br></div><div>Spencer</div><div class=3D"gmail_extra"><=
br><div class=3D"gmail_quote">On Thu, Oct 22, 2015 at 5:33 PM, MORTON, ALFR=
ED C (AL) <span dir=3D"ltr">&lt;<a href=3D"mailto:acmorton@att.com" target=
=3D"_blank">acmorton@att.com</a>&gt;</span> wrote:<br><blockquote class=3D"=
gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border=
-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div=
 lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><div><p class=3D"MsoNormal">=
<span style=3D"font-family:&#39;Courier New&#39;;color:black">That=E2=80=99=
s fine, =E2=80=9Cextract: has to go with the received information.<u></u><u=
></u></span></p><p class=3D"MsoNormal"><span style=3D"font-family:&#39;Cour=
ier New&#39;;color:black"><u></u>=C2=A0<u></u></span></p><div style=3D"bord=
er-style:none none none solid;border-left-color:blue;border-left-width:1.5p=
t;padding:0in 0in 0in 4pt"><div><div style=3D"border-style:solid none none;=
border-top-color:rgb(181,196,223);border-top-width:1pt;padding:3pt 0in 0in"=
><p class=3D"MsoNormal"><b><span style=3D"font-size:10pt;font-family:Tahoma=
,sans-serif">From:</span></b><span style=3D"font-size:10pt;font-family:Taho=
ma,sans-serif"> Gregory Mirsky [mailto:<a href=3D"mailto:gregory.mirsky@eri=
csson.com" target=3D"_blank">gregory.mirsky@ericsson.com</a>] <br><b>Sent:<=
/b> Thursday, October 22, 2015 6:17 PM<br><b>To:</b> MORTON, ALFRED C (AL);=
 Spencer Dawkins; The IESG; Black, David; Suresh Krishnan</span></p><div><d=
iv><br><b>Cc:</b> <a href=3D"mailto:draft-ietf-ippm-type-p-monitor@ietf.org=
" target=3D"_blank">draft-ietf-ippm-type-p-monitor@ietf.org</a>; <a href=3D=
"mailto:ippm-chairs@ietf.org" target=3D"_blank">ippm-chairs@ietf.org</a>; <=
a href=3D"mailto:ippm@ietf.org" target=3D"_blank">ippm@ietf.org</a><br><b>S=
ubject:</b> RE: Spencer Dawkins&#39; Yes on draft-ietf-ippm-type-p-monitor-=
02: (with COMMENT)<u></u><u></u></div></div><p></p></div></div><div><div><p=
 class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal"><span s=
tyle=3D"color:rgb(31,73,125)">Hi Al,<u></u><u></u></span></p><p class=3D"Ms=
oNormal"><span style=3D"color:rgb(31,73,125)">thank you for your thorough c=
heck of the update. Would the following be acceptable:<u></u><u></u></span>=
</p><p class=3D"MsoNormal" style=3D"margin-left:0.5in"><span style=3D"color=
:rgb(31,73,125)">the Session-Reflector MUST extract DSCP and ECN values fro=
m the received packet and MUST populate with them the S-DSCP-ECN field of t=
he corresponding reflected packet;<u></u><u></u></span></p><p class=3D"MsoN=
ormal"><span style=3D"color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>=
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)">=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 Regards,<u></u><u></u></span></p><p class=3D"MsoNormal"><span style=3D"col=
or:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Greg<u></u><u></u=
></span></p><p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)"><u>=
</u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span style=3D"color:rgb=
(31,73,125)"><u></u>=C2=A0<u></u></span></p><div><div style=3D"border-style=
:solid none none;border-top-color:rgb(181,196,223);border-top-width:1pt;pad=
ding:3pt 0in 0in"><p class=3D"MsoNormal"><b><span style=3D"font-size:10pt;f=
ont-family:Tahoma,sans-serif">From:</span></b><span style=3D"font-size:10pt=
;font-family:Tahoma,sans-serif"> MORTON, ALFRED C (AL) [<a href=3D"mailto:a=
cmorton@att.com" target=3D"_blank">mailto:acmorton@att.com</a>] <br><b>Sent=
:</b> Thursday, October 22, 2015 2:51 PM<br><b>To:</b> Gregory Mirsky; Spen=
cer Dawkins; The IESG; Black, David; Suresh Krishnan<br><b>Cc:</b> <a href=
=3D"mailto:draft-ietf-ippm-type-p-monitor@ietf.org" target=3D"_blank">draft=
-ietf-ippm-type-p-monitor@ietf.org</a>; <a href=3D"mailto:ippm-chairs@ietf.=
org" target=3D"_blank">ippm-chairs@ietf.org</a>; <a href=3D"mailto:ippm@iet=
f.org" target=3D"_blank">ippm@ietf.org</a><br><b>Subject:</b> RE: Spencer D=
awkins&#39; Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)<u></u>=
<u></u></span></p></div></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></=
p><p class=3D"MsoNormal"><span style=3D"font-family:&#39;Courier New&#39;;c=
olor:black">Hi Greg, I noticed that this bullet=E2=80=99s wording:<u></u><u=
></u></span></p><p class=3D"MsoNormal"><span style=3D"font-family:&#39;Cour=
ier New&#39;;color:black"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNor=
mal"><span style=3D"font-family:&#39;Courier New&#39;;color:black">o=C2=A0 =
the Session-Reflector MUST extract the S-DSCP-ECN value from the=C2=A0 <u><=
/u><u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-family:&#39=
;Courier New&#39;;color:black">=C2=A0=C2=A0 DSCP and ECN values of received=
 packets;<u></u><u></u></span></p><p class=3D"MsoNormal"><span style=3D"fon=
t-family:&#39;Courier New&#39;;color:black"><u></u>=C2=A0<u></u></span></p>=
<p class=3D"MsoNormal"><span style=3D"font-family:&#39;Courier New&#39;;col=
or:black">seems to reverse the meaning of =E2=80=9Cextract=E2=80=9D, and wo=
uld probably <u></u><u></u></span></p><p class=3D"MsoNormal"><span style=3D=
"font-family:&#39;Courier New&#39;;color:black">be better if worded:<u></u>=
<u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-family:&#39;Co=
urier New&#39;;color:black"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoN=
ormal"><span style=3D"font-family:&#39;Courier New&#39;;color:black">o=C2=
=A0 the Session-Reflector MUST populate the S-DSCP-ECN value with the <u></=
u><u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-family:&#39;=
Courier New&#39;;color:black">=C2=A0=C2=A0 DSCP and ECN values extracted fr=
om the corresponding the received packet;<u></u><u></u></span></p><p class=
=3D"MsoNormal"><span style=3D"font-family:&#39;Courier New&#39;;color:black=
"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span style=3D"font=
-family:&#39;Courier New&#39;;color:black">Sorry, I don=E2=80=99t know why =
I missed this before.<u></u><u></u></span></p><p class=3D"MsoNormal"><span =
style=3D"font-family:&#39;Courier New&#39;;color:black">Otherwise, I think =
this is what we want.<u></u><u></u></span></p><p class=3D"MsoNormal"><span =
style=3D"font-family:&#39;Courier New&#39;;color:black">thanks,<u></u><u></=
u></span></p><p class=3D"MsoNormal"><span style=3D"font-family:&#39;Courier=
 New&#39;;color:black">Al<u></u><u></u></span></p><p class=3D"MsoNormal"><s=
pan style=3D"font-family:&#39;Courier New&#39;;color:black"><u></u>=C2=A0<u=
></u></span></p><div style=3D"border-style:none none none solid;border-left=
-color:blue;border-left-width:1.5pt;padding:0in 0in 0in 4pt"><div><div styl=
e=3D"border-style:solid none none;border-top-color:rgb(181,196,223);border-=
top-width:1pt;padding:3pt 0in 0in"><p class=3D"MsoNormal"><b><span style=3D=
"font-size:10pt;font-family:Tahoma,sans-serif">From:</span></b><span style=
=3D"font-size:10pt;font-family:Tahoma,sans-serif"> Gregory Mirsky [<a href=
=3D"mailto:gregory.mirsky@ericsson.com" target=3D"_blank">mailto:gregory.mi=
rsky@ericsson.com</a>] <br><b>Sent:</b> Thursday, October 22, 2015 12:40 PM=
<br><b>To:</b> Spencer Dawkins; The IESG; MORTON, ALFRED C (AL); Black, Dav=
id; Kathleen Moriarty (<a href=3D"mailto:Kathleen.Moriarty.ietf@gmail.com" =
target=3D"_blank">Kathleen.Moriarty.ietf@gmail.com</a>); Suresh Krishnan; B=
en Campbell (<a href=3D"mailto:ben@nostrum.com" target=3D"_blank">ben@nostr=
um.com</a>); Alvaro Retana (aretana) (<a href=3D"mailto:aretana@cisco.com" =
target=3D"_blank">aretana@cisco.com</a>)<br><b>Cc:</b> <a href=3D"mailto:dr=
aft-ietf-ippm-type-p-monitor@ietf.org" target=3D"_blank">draft-ietf-ippm-ty=
pe-p-monitor@ietf.org</a>; <a href=3D"mailto:ippm-chairs@ietf.org" target=
=3D"_blank">ippm-chairs@ietf.org</a>; <a href=3D"mailto:ietf@trammell.ch" t=
arget=3D"_blank">ietf@trammell.ch</a>; <a href=3D"mailto:ippm@ietf.org" tar=
get=3D"_blank">ippm@ietf.org</a><br><b>Subject:</b> RE: Spencer Dawkins&#39=
; Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)<u></u><u></u></s=
pan></p></div></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p>Dear =
All,<u></u><u></u></p><p>thank you all for your reviews, comments, help and=
 patience.<u></u><u></u></p><p>Attached are:<u></u><u></u></p><p style=3D"m=
argin-left:0.5in"><u></u><span style=3D"font-family:Symbol"><span>=C2=B7<sp=
an style=3D"font-style:normal;font-variant:normal;font-weight:normal;font-s=
tretch:normal;font-size:7pt;line-height:normal;font-family:&#39;Times New R=
oman&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span></span><=
/span><u></u>diff with highlighted updates;<u></u><u></u></p><p style=3D"ma=
rgin-left:0.5in"><u></u><span style=3D"font-family:Symbol"><span>=C2=B7<spa=
n style=3D"font-style:normal;font-variant:normal;font-weight:normal;font-st=
retch:normal;font-size:7pt;line-height:normal;font-family:&#39;Times New Ro=
man&#39;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span></span></=
span><u></u>-03 version that includes all the updates.<u></u><u></u></p><p>=
Hope that you find your comments have been satisfactorily addressed.<u></u>=
<u></u></p><p><u></u>=C2=A0<u></u></p><p>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Regards,<u></u><u=
></u></p><p>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Greg<u></u><u></u></p><p><=
u></u>=C2=A0<u></u></p><p><u></u>=C2=A0<u></u></p><p>-----Original Message-=
----<br>From: Spencer Dawkins [<a href=3D"mailto:spencerdawkins.ietf@gmail.=
com" target=3D"_blank">mailto:spencerdawkins.ietf@gmail.com</a>] <br>Sent: =
Thursday, October 22, 2015 4:45 AM<br>To: The IESG<br>Cc: <a href=3D"mailto=
:draft-ietf-ippm-type-p-monitor@ietf.org" target=3D"_blank">draft-ietf-ippm=
-type-p-monitor@ietf.org</a>; <a href=3D"mailto:ippm-chairs@ietf.org" targe=
t=3D"_blank">ippm-chairs@ietf.org</a>; <a href=3D"mailto:ietf@trammell.ch" =
target=3D"_blank">ietf@trammell.ch</a>; <a href=3D"mailto:ippm@ietf.org" ta=
rget=3D"_blank">ippm@ietf.org</a>; <a href=3D"mailto:david.black@emc.com" t=
arget=3D"_blank">david.black@emc.com</a><br>Subject: Spencer Dawkins&#39; Y=
es on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)<u></u><u></u></p><p=
><u></u>=C2=A0<u></u></p><p>Spencer Dawkins has entered the following ballo=
t position for<u></u><u></u></p><p>draft-ietf-ippm-type-p-monitor-02: Yes<u=
></u><u></u></p><p><u></u>=C2=A0<u></u></p><p>When responding, please keep =
the subject line intact and reply to all email addresses included in the To=
 and CC lines. (Feel free to cut this introductory paragraph, however.)<u><=
/u><u></u></p><p><u></u>=C2=A0<u></u></p><p><u></u>=C2=A0<u></u></p><p>Plea=
se refer to <a href=3D"https://www.ietf.org/iesg/statement/discuss-criteria=
.html" target=3D"_blank"><span style=3D"color:windowtext;text-decoration:no=
ne">https://www.ietf.org/iesg/statement/discuss-criteria.html</span></a><u>=
</u><u></u></p><p>for more information about IESG DISCUSS and COMMENT posit=
ions.<u></u><u></u></p><p><u></u>=C2=A0<u></u></p><p><u></u>=C2=A0<u></u></=
p><p>The document, along with other ballot positions, can be found here:<u>=
</u><u></u></p><p><a href=3D"https://datatracker.ietf.org/doc/draft-ietf-ip=
pm-type-p-monitor/" target=3D"_blank"><span style=3D"color:windowtext;text-=
decoration:none">https://datatracker.ietf.org/doc/draft-ietf-ippm-type-p-mo=
nitor/</span></a><u></u><u></u></p><p><u></u>=C2=A0<u></u></p><p><u></u>=C2=
=A0<u></u></p><p><u></u>=C2=A0<u></u></p><p>-------------------------------=
---------------------------------------<u></u><u></u></p><p>COMMENT:<u></u>=
<u></u></p><p>-------------------------------------------------------------=
---------<u></u><u></u></p><p><u></u>=C2=A0<u></u></p><p>My apologies for t=
hinking slowly ... but it doesn&#39;t look like these questions will be dif=
ficult to resolve.<u></u><u></u></p><p><u></u>=C2=A0<u></u></p><p>I talked =
with David Black about this draft, and he had questions that I translated i=
nto AD-speak as:<u></u><u></u></p><p><u></u>=C2=A0<u></u></p><p>Reflecting =
an unknown DSCP value is a MAY. Can reflecting packets using a DSCP value y=
ou don&#39;t understand be a bad idea? How important is that the DSCP value=
 is NOT 0 (CS0, default forwarding)?<u></u><u></u></p><p><u></u>=C2=A0<u></=
u></p><p>If you are reflecting a DSCP value, are you also reflecting the EC=
N(0) bit unchanged?<u></u><u></u></p><p><u></u>=C2=A0<u></u></p><p>TWAMP do=
esn&#39;t look congestion-controlled to me (certainly not in the reflected =
direction - <a href=3D"https://tools.ietf.org/html/rfc5357" target=3D"_blan=
k"><span style=3D"color:windowtext;text-decoration:none">https://tools.ietf=
.org/html/rfc5357</span></a> says the packet is reflected as quickly/immedi=
ately as possible in at least three places I can see. What is a typical sen=
ding rate for the Session-Sender, and is that likely to cause problems in t=
he reflected direction?<u></u><u></u></p><p><u></u>=C2=A0<u></u></p><p>His =
note to me follows:<u></u><u></u></p><p><u></u>=C2=A0<u></u></p><p>This bul=
let at the end of 2.2.2 bothers me:<u></u><u></u></p><p><u></u>=C2=A0<u></u=
></p><p>=C2=A0=C2=A0=C2=A0o=C2=A0 if the negotiated/provisioned DSCP value =
is not known (e.g.=C2=A0 TWAMP<u></u><u></u></p><p>=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 Light), the choice of the DSCP is implementation specific.=C2=A0 For=
<u></u><u></u></p><p>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 instance, Session-Refle=
ctor MAY copy the DSCP value from the<u></u><u></u></p><p>=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 received test packet and set it as DSCP in a reflected pack=
et<u></u><u></u></p><p><u></u>=C2=A0<u></u></p><p>This is implicitly recomm=
ending reflection of the DSCP value, and by omitted implication, reflection=
 of the ECN value.=C2=A0 Both of those seem like bad ideas, it would be bet=
ter to say that in this case the DSCP should be set to 0 (CS0, Default forw=
arding).=C2=A0 I would also say that the ECN field MUST be set to 0 (not-EC=
T) in the reflected packet, always.<u></u><u></u></p><p><u></u>=C2=A0<u></u=
></p><p>I=E2=80=99m a bit concerned about setting ECT(0) or ECT(1) on the f=
orward measurement path, as TWAMP is not congestion-responsive.=C2=A0 Is th=
e transmission rate of TWAMP low enough to not cause a problem if CE signal=
s are received and ignored in the ECN field at the Reflector?<u></u><u></u>=
</p><p><u></u>=C2=A0<u></u></p><p><u></u>=C2=A0<u></u></p></div></div></div=
></div></div></div></blockquote></div><br></div></div></div>

--001a11438ee8846c090522ca6652--


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From: "Ben Campbell" <ben@nostrum.com>
To: "Gregory Mirsky" <gregory.mirsky@ericsson.com>
Date: Fri, 23 Oct 2015 14:38:17 -0500
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Subject: Re: [ippm] Ben Campbell's No Objection on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Thanks for the response. These updates would address all of my comments.

Thanks!

Ben.

On 21 Oct 2015, at 16:48, Gregory Mirsky wrote:

> Dear Ben,
> thank you for your careful review and helpful comments. Please find my 
> answers and proposed resolution in-line under tag GIM>>.
>
> 	Regards,
> 		Greg
>
> -----Original Message-----
> From: Ben Campbell [mailto:ben@nostrum.com]
> Sent: Tuesday, October 20, 2015 3:29 PM
> To: The IESG
> Cc: draft-ietf-ippm-type-p-monitor@ietf.org; ippm-chairs@ietf.org; 
> ietf@trammell.ch; ippm@ietf.org
> Subject: Ben Campbell's No Objection on 
> draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
>
> Ben Campbell has entered the following ballot position for
> draft-ietf-ippm-type-p-monitor-02: No Objection
>
> When responding, please keep the subject line intact and reply to all 
> email addresses included in the To and CC lines. (Feel free to cut 
> this introductory paragraph, however.)
>
>
> Please refer to 
> https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
>
>
> The document, along with other ballot positions, can be found here:
> https://datatracker.ietf.org/doc/draft-ietf-ippm-type-p-monitor/
>
>
>
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>
> Just a few mostly editorial comments:
>
> - Abstract: Did you mean OPTIONAL to be capitalized in the abstract? 
> I'm not sure what the purpose of a 2119 keyword would be there.
> GIM>> Removed OPTIONAL
>
> - 1, first paragraph:
> There are lots of missing articles ("the") in the first paragraph.
> GIM>> This is proposed updated of the paragraph. Please let me know if 
> these changes improved the text.
> I've updated capitalization of Type-P descriptor throughout the text 
> as well.
> NEW TEXT:
> The One-Way Active Measurement Protocol (OWAMP) [RFC4656] defines the
> Type-P Descriptor field and negotiation of its value in OWAMP-Control
> protocol.  The Two-Way Active Measurement Protocol (TWAMP) [RFC5357]
> states that only a Differentiated Services Code Point (DSCP)
> [RFC2474], [RFC3168], [RFC3260] value can be defined by Type-P
> Descriptor and the negotiated value must be used by both Session-
> Sender and Session-Reflector.  The TWAMP specification also states
> that the same DSCP value (found in the Session-Sender packet) MUST be
> used in the test packet reflected by the Session-Reflector.  However
> the TWAMP-Test protocol does not specify any methods to determine or
> report when the DSCP value has changed or is different than expected
> in the forward or reverse direction.  Re-marking the DSCP (changing
> its original value) in IP networks is possible and often accomplished
> by a Differentiated Services policy configured on a single node along
> the IP path.  In many cases, a change of the DSCP value indicates an
> unintentional or erroneous behavior.  At best, the Session-Sender can
> detect a change of the DSCP reverse direction assuming such change is
> actually detectable.
>
> -1, 2nd paragraph:
> There's no need to say it's OPTIONAL more than once.
> GIM>> Thank you, removed the second one.
>
> - 2.1, 1st paragraph:
> "DSCP and ECN monitoring flag" and "Mode" each need a leading "the".
> GIM>> Yes, updated. I've made consistent use of "DSCP and ECN 
> Monitoring flag" throughout the document.
> - 2.2.1:
> The MUST in the first paragraph is not really needed. The 
> Session-Reflector either supports the extension and does these things, 
> or does not support the extension and does not do these things.
> GIM>> Agree, removed.
>
> - First bullet in list at end of 2.2.1:
> s/extracts/extract
> GIM>> Yes, thank you.


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Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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On 23 Oct 2015, at 14:13, Spencer Dawkins at IETF wrote:

> * Ben's comment - looks addressed.

Yep.

Thanks!

Ben.


From nobody Tue Oct 27 06:35:35 2015
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Subject: [ippm] Logistics for IPPM @ IETF94 and call for presentation slides
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"><meta http-equiv=3D"Content-Type" content=3D"text/html=
 charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"" dir=3D"auto">Dear IPPM participants:<div class=3D""><br =
class=3D""></div><div class=3D"">As currently scheduled, the IPPM WG =
meeting will be at 13:00 - 15:00 (JST) (04:00-06:00 UTC), Tuesday, =
November 3, 2015 in room 301 at the IETF meeting venue.</div><div =
class=3D""><br class=3D""></div><div class=3D"">If anyone is willing to =
take minutes and/or be jabber scribe for the meeting, please respond to =
this e-mail.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Presenters: We are now 1 week away from the meeting time. =
Please submit your presentation slides to me and I will post them to the =
meeting materials page. &nbsp;Note that I will be remote for IETF 94, so =
it will be more challenging for me to process slides that are submitted =
at the last minute. &nbsp;The agenda is very full and we will be =
diligently maintaining the timeline for the agenda as posted at&nbsp;<a =
href=3D"https://www.ietf.org/proceedings/94/agenda/agenda-94-ippm" =
class=3D"">https://www.ietf.org/proceedings/94/agenda/agenda-94-ippm</a>&n=
bsp;. Please allow time for questions in your presentation time =
slot.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Thanks,</div><div class=3D""><br class=3D""></div><div =
class=3D"">Bill Cerveny</div><div class=3D"">IPPMn WG =
co-chair</div></body></html>=


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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, "draft-ietf-ippm-type-p-monitor.all@tools.ietf.org" <draft-ietf-ippm-type-p-monitor.all@tools.ietf.org>, "ops-dir@ietf.org" <ops-dir@ietf.org>
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Dear Al,

thank you for your thorough review and thoughtful comments. I've prepared t=
he new version to respond to all comments but from Kathleen Moriarty (need =
some extra time).

Would greatly appreciate your review of the changes and hope that these add=
ress your comments.

Please find my answers below in-line and tagged GIM>>.



                Regards,

                                Greg



-----Original Message-----
From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com]
Sent: Monday, October 19, 2015 2:13 PM
To: draft-ietf-ippm-type-p-monitor.all@tools.ietf.org; ops-dir@ietf.org
Cc: ops-ads@tools.ietf.org; ippm@ietf.org
Subject: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02



OPS-DIR, Authors,



I have reviewed this document as part of the Operational directorate's ongo=
ing effort to review all IETF documents being processed by the IESG.

These comments were written primarily for the benefit of the operational ar=
ea directors. Document editors and WG chairs should treat these comments ju=
st like any other last call comments.



Al



Title:

Differentiated Service Code Point and Explicit Congestion Notification

       Monitoring in Two-Way Active Measurement Protocol (TWAMP)

                   draft-ietf-ippm-type-p-monitor-02

https://tools.ietf.org/html/draft-ietf-ippm-type-p-monitor-02



Summary: Almost ready, comments and editorial suggestions follow.



The draft header should indicate that this draft updates RFC 5357.



Section 2.2.1



Figure 1 has a number of canonical references that should

be cited to ensure IPv4 and IPv6 applicability, including

RFC 2474, RFC 3168, and other relevant updates (of which

there are many).



<later>

   o  if the negotiated/provisioned DSCP value is not known (e.g.  TWAMP

      Light), the choice of the DSCP is implementation specific.  For

      instance, Session-Reflector MAY copy the DSCP value from the

      received test packet and set it as DSCP in a reflected packet.

Question:

What about the ECN value?   From 3168:

      +-----+-----+

      | ECN FIELD |

      +-----+-----+

        ECT   CE         [Obsolete] RFC 2481 names for the ECN bits.

         0     0         Not-ECT

         0     1         ECT(1)

         1     0         ECT(0)

         1     1         CE

It makes little sense to copy a "11" =3D=3D CE into the reflected packet,

and it may affect the measured performance if "11" were copied.

The draft needs more guidance here (there is a general problem

when the negotiated values are "not known"; this does not apply

to the Standards Track TWAMP protocol or its extensions).

GIM>> Added

ECN SHOULD be set to Not-ECT codepoint value [RFC3168].

-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-



Editorial comments/suggestions:



OLD

2.2.  TWAMP-Test Extension



   Monitoring of DSCP and ECN requires support by the Session-Reflector

   and changes the format of its test packet format both in

   unauthenticated, authenticated and encrypted modes.

Suggest:

   Monitoring of DSCP and ECN requires support by the Session-Reflector

   and changes the test packet format in all the original

   (unauthenticated, authenticated and encrypted) modes.



GIM=1B$B"d=1B(B Thank you, accepted.

2.2.1



OLD

   o  the first six bits of the Differentiated Service field MUST be

      copied from received Session-Sender test packet into Sender DSCP

      (S-DSCP) field;



   o  the following two bits of the ECN field MUST be copied from

      received Session-Sender test packet into Sender ECN (S-ECN) field.

Suggest:

   o  the six (least-significant) bits of the Differentiated Service field =
MUST be

      copied from received Session-Sender test packet into Sender DSCP

      (S-DSCP) field;



   o  the two bits of the ECN field MUST be copied from

      received Session-Sender test packet into Sender ECN (S-ECN) field.

GIM=1B$B"d=1B(B Thank you. Accepted.



because RFC 3168 defines:

         0     1     2     3     4     5     6     7

      +-----+-----+-----+-----+-----+-----+-----+-----+

      |          DS FIELD, DSCP           | ECN FIELD |

      +-----+-----+-----+-----+-----+-----+-----+-----+



        DSCP: differentiated services codepoint

        ECN:  Explicit Congestion Notification



      Figure 2: The Differentiated Services and ECN Fields in IP.

-=3D-=3D-=3D-=3D-=3D-=3D-=3D-



OLD

    0     1     2     3     4     5     6     7     8

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    |               S-DSCP              |   S-ECN   |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



                Figure 1: Sender DSCP and ECN field format



Suggest:

The extra "+" within bit positions are distracting,

and don't conform to the conventions of these diagrams.

Also, there's no "8" when numbering from 0.

GIM=1B$B"d=1B(B Agree. New version:

      0   1   2   3   4   5   6   7
    +---+---+---+---+---+---+---+---+
    |         S-DSCP        | S-ECN |
    +---+---+---+---+---+---+---+---+

                Figure 1: Sender DSCP and ECN field format





Some attempt should be made to put Figure 3 on a single page in the

final version. There's one line taken up by "+" that is unnecessary

in the modified field:

GIM=1B$B"d=1B(B That turned to be rather difficult, considering that the or=
iginal figure in RFC 5357 is over one page already. I've tried to move figu=
re to the very top though.

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    | Sender TTL  |  S-DSCP-ECN   |                               |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +

    |                                                             |

>> +                                                             + <<

    |                       MBZ (14 octets)                       |

    |                                                             |

    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+







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<p class=3D"MsoPlainText">Dear Al,<o:p></o:p></p>
<p class=3D"MsoPlainText">thank you for your thorough review and thoughtful=
 comments. I've prepared the new version to respond to all comments but fro=
m Kathleen Moriarty (need some extra time).<o:p></o:p></p>
<p class=3D"MsoPlainText">Would greatly appreciate your review of the chang=
es and hope that these address your comments.<o:p></o:p></p>
<p class=3D"MsoPlainText">Please find my answers below in-line and tagged G=
IM&gt;&gt;.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Regards,<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Greg<o:p></o=
:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">-----Original Message-----<br>
From: MORTON, ALFRED C (AL) [mailto:acmorton@att.com] <br>
Sent: Monday, October 19, 2015 2:13 PM<br>
To: draft-ietf-ippm-type-p-monitor.all@tools.ietf.org; ops-dir@ietf.org<br>
Cc: ops-ads@tools.ietf.org; ippm@ietf.org<br>
Subject: OPS-DIR Review: draft-ietf-ippm-type-p-monitor-02</p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">OPS-DIR, Authors, <o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">I have reviewed this document as part of the Oper=
ational directorate's ongoing effort to review all IETF documents being pro=
cessed by the IESG.&nbsp;
<o:p></o:p></p>
<p class=3D"MsoPlainText">These comments were written primarily for the ben=
efit of the operational area directors. Document editors and WG chairs shou=
ld treat these comments just like any other last call comments.<o:p></o:p><=
/p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Al<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Title:<o:p></o:p></p>
<p class=3D"MsoPlainText">Differentiated Service Code Point and Explicit Co=
ngestion Notification<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Monitoring i=
n Two-Way Active Measurement Protocol (TWAMP)<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; draft-ietf-ippm=
-type-p-monitor-02<o:p></o:p></p>
<p class=3D"MsoPlainText"><a href=3D"https://tools.ietf.org/html/draft-ietf=
-ippm-type-p-monitor-02"><span style=3D"color:windowtext;text-decoration:no=
ne">https://tools.ietf.org/html/draft-ietf-ippm-type-p-monitor-02</span></a=
><o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Summary: Almost ready, comments and editorial sug=
gestions follow.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">The draft header should indicate that this draft =
updates RFC 5357.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Section 2.2.1<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Figure 1 has a number of canonical references tha=
t should
<o:p></o:p></p>
<p class=3D"MsoPlainText">be cited to ensure IPv4 and IPv6 applicability, i=
ncluding
<o:p></o:p></p>
<p class=3D"MsoPlainText">RFC 2474, RFC 3168, and other relevant updates (o=
f which <o:p>
</o:p></p>
<p class=3D"MsoPlainText">there are many).<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&lt;later&gt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; if the negotiated/provisione=
d DSCP value is not known (e.g.&nbsp; TWAMP<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Light), the choice=
 of the DSCP is implementation specific.&nbsp; For<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; instance, Session-=
Reflector MAY copy the DSCP value from the<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received test pack=
et and set it as DSCP in a reflected packet.<o:p></o:p></p>
<p class=3D"MsoPlainText">Question:<o:p></o:p></p>
<p class=3D"MsoPlainText">What about the ECN value?&nbsp;&nbsp; From 3168:<=
o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;---=
--&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | ECN FIELD |<o:p>=
</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;---=
--&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECT&nb=
sp;&nbsp; CE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [Obsolete] RFC=
 2481 names for the ECN bits.<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
0&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 Not-ECT<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
0&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 ECT(1)<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
1&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 ECT(0)<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
1&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 CE<o:p></o:p></p>
<p class=3D"MsoPlainText">It makes little sense to copy a &quot;11&quot; =
=3D=3D CE into the reflected packet,<o:p></o:p></p>
<p class=3D"MsoPlainText">and it may affect the measured performance if &qu=
ot;11&quot; were copied.<o:p></o:p></p>
<p class=3D"MsoPlainText">The draft needs more guidance here (there is a ge=
neral problem<o:p></o:p></p>
<p class=3D"MsoPlainText">when the negotiated values are &quot;not known&qu=
ot;; this does not apply
<o:p></o:p></p>
<p class=3D"MsoPlainText">to the Standards Track TWAMP protocol or its exte=
nsions).<o:p></o:p></p>
<p class=3D"MsoPlainText">GIM&gt;&gt; Added<o:p></o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:.5in"><span style=3D"color:b=
lack">ECN SHOULD be set to Not-ECT codepoint value [RFC3168].<o:p></o:p></s=
pan></p>
<p class=3D"MsoPlainText">-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=
<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Editorial comments/suggestions:<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">OLD<o:p></o:p></p>
<p class=3D"MsoPlainText">2.2.&nbsp; TWAMP-Test Extension<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; Monitoring of DSCP and ECN requires =
support by the Session-Reflector<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; and changes the format of its test p=
acket format both in<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; unauthenticated, authenticated and e=
ncrypted modes. <o:p>
</o:p></p>
<p class=3D"MsoPlainText">Suggest:<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; Monitoring of DSCP and ECN requires =
support by the Session-Reflector<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; and changes the test packet format i=
n all the original<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; (unauthenticated, authenticated and =
encrypted) modes. <o:p>
</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">GIM</span><span style=
=3D"font-family:&quot;Cambria Math&quot;,&quot;serif&quot;;color:black">=1B=
$B"d=1B(B</span><span style=3D"color:black"> Thank you, accepted.<o:p></o:p=
></span></p>
<p class=3D"MsoPlainText">2.2.1<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">OLD<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; the first six bits of the Di=
fferentiated Service field MUST be<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; copied from receiv=
ed Session-Sender test packet into Sender DSCP<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (S-DSCP) field;<o:=
p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; the following two bits of th=
e ECN field MUST be copied from<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received Session-S=
ender test packet into Sender ECN (S-ECN) field.<o:p></o:p></p>
<p class=3D"MsoPlainText">Suggest:<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; the six (least-significant) =
bits of the Differentiated Service field MUST be<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; copied from receiv=
ed Session-Sender test packet into Sender DSCP<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (S-DSCP) field;<o:=
p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp; o&nbsp; the two bits of the ECN fiel=
d MUST be copied from<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; received Session-S=
ender test packet into Sender ECN (S-ECN) field.<o:p></o:p></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">GIM</span><span style=
=3D"font-family:&quot;Cambria Math&quot;,&quot;serif&quot;;color:black">=1B=
$B"d=1B(B</span><span style=3D"color:black"> Thank you. Accepted.<o:p></o:p=
></span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">because RFC 3168 defines:<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;=
0&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbs=
p; 3&nbsp;&nbsp;&nbsp;&nbsp; 4&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&nbsp;&nbsp;&=
nbsp; 6&nbsp;&nbsp;&nbsp;&nbsp; 7<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;---=
--&#43;-----&#43;-----&#43;-----&#43;-----&#43;-----&#43;-----&#43;<o:p></o=
:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DS FIELD, DSCP&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | ECN FIELD |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;-----&#43;---=
--&#43;-----&#43;-----&#43;-----&#43;-----&#43;-----&#43;-----&#43;<o:p></o=
:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DSCP: =
differentiated services codepoint<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ECN:&n=
bsp; Explicit Congestion Notification<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 2: The Diff=
erentiated Services and ECN Fields in IP.<o:p></o:p></p>
<p class=3D"MsoPlainText">-=3D-=3D-=3D-=3D-=3D-=3D-=3D-<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">OLD<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp; 1&nb=
sp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp; 3&nbsp;&nbsp;&nbsp;&nbsp; 4=
&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&nbsp;&nbsp;&nbsp; 6&nbsp;&nbsp;&nbsp;&nbsp=
; 7&nbsp;&nbsp;&nbsp;&nbsp; 8<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S-DSCP&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&n=
bsp; S-ECN&nbsp;&nbsp; |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Figure 1: Sender DSCP and ECN fie=
ld format<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Suggest:<o:p></o:p></p>
<p class=3D"MsoPlainText">The extra &quot;&#43;&quot; within bit positions =
are distracting,<o:p></o:p></p>
<p class=3D"MsoPlainText">and don't conform to the conventions of these dia=
grams.<o:p></o:p></p>
<p class=3D"MsoPlainText">Also, there's no &quot;8&quot; when numbering fro=
m 0.<o:p></o:p></p>
<p class=3D"MsoPlainText"><span style=3D"color:black">GIM</span><span style=
=3D"font-family:&quot;Cambria Math&quot;,&quot;serif&quot;;color:black">=1B=
$B"d=1B(B</span><span style=3D"color:black"> Agree. New version:<o:p></o:p>=
</span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp; 1&nbsp;&nbsp; 2&nbsp;&nbsp;=
 3&nbsp;&nbsp; 4&nbsp;&nbsp; 5&nbsp;&nbsp; 6&nbsp;&nbsp; 7<br>
&nbsp;&nbsp;&nbsp; &#43;---&#43;---&#43;---&#43;---&#43;---&#43;---&#43;---=
&#43;---&#43;<br>
&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S-DSCP=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | S-ECN |<br>
&nbsp;&nbsp;&nbsp; &#43;---&#43;---&#43;---&#43;---&#43;---&#43;---&#43;---=
&#43;---&#43;<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; Figure 1: Sender DSCP and ECN field format</span><o:p></o:p=
></p>
<p class=3D"MsoPlainText"><span style=3D"color:black"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Some attempt should be made to put Figure 3 on a =
single page in the
<o:p></o:p></p>
<p class=3D"MsoPlainText">final version. There's one line taken up by &quot=
;&#43;&quot; that is unnecessary<o:p></o:p></p>
<p class=3D"MsoPlainText">in the modified field:<o:p></o:p></p>
<p class=3D"MsoPlainText">GIM<span style=3D"font-family:&quot;Cambria Math&=
quot;,&quot;serif&quot;">=1B$B"d=1B(B</span> That turned to be rather diffi=
cult, considering that the original figure in RFC 5357 is over one page alr=
eady. I've tried to move figure to the very top though.<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; | Sender TTL&nbsp; |&nbsp; S-D=
SCP-ECN&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; &#43;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></p>
<p class=3D"MsoPlainText">&gt;&gt; &#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp; &#43; &lt;&lt;<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp; MBZ (14 octets)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |<o:p></o:p></p>
<p class=3D"MsoPlainText">&nbsp;&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
</div>
</body>
</html>

--_000_7347100B5761DC41A166AC17F22DF1122190D981eusaamb103erics_--

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From nobody Sat Oct 31 18:34:13 2015
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From: "Black, David" <david.black@emc.com>
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Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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From: "Black, David" <david.black@emc.com>
To: "MORTON, ALFRED C (AL)" <acmorton@att.com>, Spencer Dawkins <spencerdawkins.ietf@gmail.com>, The IESG <iesg@ietf.org>
Thread-Topic: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Cc: "draft-ietf-ippm-type-p-monitor@ietf.org" <draft-ietf-ippm-type-p-monitor@ietf.org>, "Black, David" <david.black@emc.com>, "ippm-chairs@ietf.org" <ippm-chairs@ietf.org>, "ippm@ietf.org" <ippm@ietf.org>
Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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From nobody Sat Oct 31 18:34:16 2015
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: Spencer Dawkins <spencerdawkins.ietf@gmail.com>, The IESG <iesg@ietf.org>,  "MORTON, ALFRED C (AL)" <acmorton@att.com>, "Black, David" <david.black@emc.com>, "Kathleen Moriarty (Kathleen.Moriarty.ietf@gmail.com)" <Kathleen.Moriarty.ietf@gmail.com>, Suresh Krishnan <suresh.krishnan@ericsson.com>, "Ben Campbell (ben@nostrum.com)" <ben@nostrum.com>, "Alvaro Retana (aretana) (aretana@cisco.com)" <aretana@cisco.com>
Thread-Topic: Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Date: Thu, 22 Oct 2015 16:40:21 +0000
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--_005_7347100B5761DC41A166AC17F22DF1122190E1F3eusaamb103erics_
Content-Type: text/plain; name="draft-ietf-ippm-type-p-monitor-03.txt"
Content-Description: draft-ietf-ippm-type-p-monitor-03.txt
Content-Disposition: attachment;
	filename="draft-ietf-ippm-type-p-monitor-03.txt"; size=23335;
	creation-date="Thu, 22 Oct 2015 16:16:10 GMT";
	modification-date="Thu, 22 Oct 2015 16:16:10 GMT"
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From: "Black, David" <david.black@emc.com>
To: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>, "MORTON, ALFRED C (AL)" <acmorton@att.com>
Thread-Topic: Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Date: Fri, 23 Oct 2015 19:23:02 +0000
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Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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From nobody Sat Oct 31 18:34:19 2015
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "Black, David" <david.black@emc.com>, Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>, "MORTON, ALFRED C (AL)" <acmorton@att.com>
Thread-Topic: Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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From nobody Sat Oct 31 18:34:20 2015
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From: "Black, David" <david.black@emc.com>
To: Gregory Mirsky <gregory.mirsky@ericsson.com>, Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>, "MORTON, ALFRED C (AL)" <acmorton@att.com>
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Cc: "ippm-chairs@ietf.org" <ippm-chairs@ietf.org>, "ippm@ietf.org" <ippm@ietf.org>, "Black, David" <david.black@emc.com>, Suresh Krishnan <suresh.krishnan@ericsson.com>, The IESG <iesg@ietf.org>, "draft-ietf-ippm-type-p-monitor@ietf.org" <draft-ietf-ippm-type-p-monitor@ietf.org>
Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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From nobody Sat Oct 31 18:34:22 2015
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From: Suresh Krishnan <suresh.krishnan@ericsson.com>
To: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>, "MORTON, ALFRED C (AL)" <acmorton@att.com>
Thread-Topic: Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Hi Spencer,=0A=
=0A=
On 10/23/2015 03:13 PM, Spencer Dawkins at IETF wrote:=0A=
> # Suresh's Gen-ART review - looks addressed.=0A=
=0A=
Yep. The changes look good to me.=0A=
=0A=
Thanks=0A=
Suresh=0A=
=0A=


From nobody Sat Oct 31 18:34:24 2015
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From nobody Sat Oct 31 18:34:25 2015
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "Black, David" <david.black@emc.com>, Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>, "MORTON, ALFRED C (AL)" <acmorton@att.com>
Thread-Topic: Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Date: Fri, 23 Oct 2015 20:32:44 +0000
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Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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From: "Black, David" <david.black@emc.com>
To: Gregory Mirsky <gregory.mirsky@ericsson.com>, Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>, "MORTON, ALFRED C (AL)" <acmorton@att.com>
Thread-Topic: Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
Thread-Index: AQHRDL8Xp2489JYBcUSZ+jb9IAVrg553+j6AgABW2YCAAAdUgIAABIEAgAFaUAD//79NYIAARvMA///CWBCAAE2tAIADHKEA
Date: Mon, 26 Oct 2015 00:04:28 +0000
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Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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From nobody Sat Oct 31 18:34:28 2015
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From: "Black, David" <david.black@emc.com>
To: Gregory Mirsky <gregory.mirsky@ericsson.com>, Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>, "MORTON, ALFRED C (AL)" <acmorton@att.com>
Thread-Topic: Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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Date: Mon, 26 Oct 2015 00:08:03 +0000
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References: <20151022114500.9917.91739.idtracker@ietfa.amsl.com> <7347100B5761DC41A166AC17F22DF1122190E1F3@eusaamb103.ericsson.se> <4AF73AA205019A4C8A1DDD32C034631D0BB67F9B65@NJFPSRVEXG0.research.att.com> <7347100B5761DC41A166AC17F22DF1122190E70D@eusaamb103.ericsson.se> <4AF73AA205019A4C8A1DDD32C034631D0BB67F9B6C@NJFPSRVEXG0.research.att.com> <CAKKJt-c902yHN0iseOnm=YTwN=OsagbVU_F1WUmveMArdFn4hQ@mail.gmail.com> <CE03DB3D7B45C245BCA0D2432779493618D06814@MX104CL02.corp.emc.com> <7347100B5761DC41A166AC17F22DF1122190EFC6@eusaamb103.ericsson.se> <CE03DB3D7B45C245BCA0D2432779493618D069DE@MX104CL02.corp.emc.com> <7347100B5761DC41A166AC17F22DF1122190F06C@eusaamb103.ericsson.se> <CE03DB3D7B45C245BCA0D2432779493618D08776@MX104CL02.corp.emc.com>
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Cc: "ippm-chairs@ietf.org" <ippm-chairs@ietf.org>, "ippm@ietf.org" <ippm@ietf.org>, "Black, David" <david.black@emc.com>, Suresh Krishnan <suresh.krishnan@ericsson.com>, The IESG <iesg@ietf.org>, "draft-ietf-ippm-type-p-monitor@ietf.org" <draft-ietf-ippm-type-p-monitor@ietf.org>
Subject: Re: [ippm] Spencer Dawkins' Yes on draft-ietf-ippm-type-p-monitor-02: (with COMMENT)
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From nobody Sat Oct 31 19:11:41 2015
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From: "MORTON, ALFRED C (AL)" <acmorton@att.com>
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Thread-Topic: [ippm] I-D Action: draft-ietf-ippm-6man-pdm-option-01.txt
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Hi Nalini, Robert and Mike,

a few comments on:

>         Title           : IPv6 Performance and Diagnostic Metrics (PDM)
> Destination Option
>         Authors         : Nalini Elkins
>                           Robert Hamilton
>                           Michael S. Ackermann
> 	Filename        : draft-ietf-ippm-6man-pdm-option-01.txt
> 	Pages           : 28
> 	Date            : 2015-10-10
>=20
> There's also a htmlized version available at:
> https://tools.ietf.org/html/draft-ietf-ippm-6man-pdm-option-01
>=20
Let's discuss this week when we get a chance...

[ACM] First sentence suggestion
1  Background

   To assess performance problems,  measurements based on optional
   sequence numbers and timing may be embedded in each packet.

suggest:
   To assess performance and diagnose problems, measurements based on optio=
nal...
                         ^^^^^^^^^^^^^
THEN:
   An
   implementation of the existing IPv6 Destination Options extension
   header, the Performance and Diagnostic Metrics (PDM) Destination
   Options extension header has been proposed in a companion document.
[ACM]
This is all one doc now, right?

[ACM]
In section 1.6, you give one circumstance where the PDM DOH won't work
for the mixed v4 v6 network in transition.  That's a good limitation to=20
make clear.
When we discussed the possibility of header extension removal in=20
paragraph 4 of=20
https://tools.ietf.org/html/draft-morton-ippm-2330-stdform-typep-01#section=
-3
I think we may have mentioned that DOH might be removed by some intermediat=
e
nodes today, and this seems to be another case where headers might be=20
removed. Although this is inconsistent with recommendations in=20
https://tools.ietf.org/html/rfc7045
it may be worth mentioning as a possible pit-fall related to early deployme=
nt
of IPv6.

[ACM] in
2.1 Round-Trip Delay

   Round-trip *Network* delay is the delay for packet transfer from a
   source host to a destination host and then back to the source host.
   This measurement has been defined, and the advantages and
   disadvantages discussed in "A Round-trip Delay Metric for IPPM"
   [RFC2681].
It would be worthwhile to mention that the RFC 2681 RT delay=20
excludes the destination host processing time, which is a quantity
you want to measure, and keep separate from RT delay.

[ACM]
Section 3.3 Header placement
the first bullet is an "OR"

    - Before the upper-layer header or the ESP header.

Then I see the DOH listed twice, but it is portrayed in=20
in the figure of Section 3.4 as an option to have
the header in BOTH,=20

    * =3D if present, could be before ESP, after ESP, or both

Suggest to make *both* in these sections consistent.

Al

